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linux/drivers/md/md.c
NeilBrown f3378b4870 md: expedite metadata update when switching read-auto -> active 
If something has failed while the array was read-auto,
then when we switch to 'active' we need to update the metadata.
This will happen anyway but it is good to expedite it, and
also to ensure any failed device has been released by the
underlying device before we try to action the ioctl which
caused us to switch to 'active' mode.

Reported-by: Joe Lawrence <Joe.Lawrence@stratus.com>
Signed-off-by: NeilBrown <neilb@suse.de>
2013-02-28 11:59:03 +11:00

8651 lines
223 KiB
C
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/*
md.c : Multiple Devices driver for Linux
Copyright (C) 1998, 1999, 2000 Ingo Molnar
completely rewritten, based on the MD driver code from Marc Zyngier
Changes:
- RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
- RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
- boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
- kerneld support by Boris Tobotras <boris@xtalk.msk.su>
- kmod support by: Cyrus Durgin
- RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
- Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
- lots of fixes and improvements to the RAID1/RAID5 and generic
RAID code (such as request based resynchronization):
Neil Brown <neilb@cse.unsw.edu.au>.
- persistent bitmap code
Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
You should have received a copy of the GNU General Public License
(for example /usr/src/linux/COPYING); if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kthread.h>
#include <linux/blkdev.h>
#include <linux/sysctl.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/hdreg.h>
#include <linux/proc_fs.h>
#include <linux/random.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/file.h>
#include <linux/compat.h>
#include <linux/delay.h>
#include <linux/raid/md_p.h>
#include <linux/raid/md_u.h>
#include <linux/slab.h>
#include "md.h"
#include "bitmap.h"
#ifndef MODULE
static void autostart_arrays(int part);
#endif
/* pers_list is a list of registered personalities protected
* by pers_lock.
* pers_lock does extra service to protect accesses to
* mddev->thread when the mutex cannot be held.
*/
static LIST_HEAD(pers_list);
static DEFINE_SPINLOCK(pers_lock);
static void md_print_devices(void);
static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
static struct workqueue_struct *md_wq;
static struct workqueue_struct *md_misc_wq;
#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
/*
* Default number of read corrections we'll attempt on an rdev
* before ejecting it from the array. We divide the read error
* count by 2 for every hour elapsed between read errors.
*/
#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
/*
* Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
* is 1000 KB/sec, so the extra system load does not show up that much.
* Increase it if you want to have more _guaranteed_ speed. Note that
* the RAID driver will use the maximum available bandwidth if the IO
* subsystem is idle. There is also an 'absolute maximum' reconstruction
* speed limit - in case reconstruction slows down your system despite
* idle IO detection.
*
* you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
* or /sys/block/mdX/md/sync_speed_{min,max}
*/
static int sysctl_speed_limit_min = 1000;
static int sysctl_speed_limit_max = 200000;
static inline int speed_min(struct mddev *mddev)
{
return mddev->sync_speed_min ?
mddev->sync_speed_min : sysctl_speed_limit_min;
}
static inline int speed_max(struct mddev *mddev)
{
return mddev->sync_speed_max ?
mddev->sync_speed_max : sysctl_speed_limit_max;
}
static struct ctl_table_header *raid_table_header;
static ctl_table raid_table[] = {
{
.procname = "speed_limit_min",
.data = &sysctl_speed_limit_min,
.maxlen = sizeof(int),
.mode = S_IRUGO|S_IWUSR,
.proc_handler = proc_dointvec,
},
{
.procname = "speed_limit_max",
.data = &sysctl_speed_limit_max,
.maxlen = sizeof(int),
.mode = S_IRUGO|S_IWUSR,
.proc_handler = proc_dointvec,
},
{ }
};
static ctl_table raid_dir_table[] = {
{
.procname = "raid",
.maxlen = 0,
.mode = S_IRUGO|S_IXUGO,
.child = raid_table,
},
{ }
};
static ctl_table raid_root_table[] = {
{
.procname = "dev",
.maxlen = 0,
.mode = 0555,
.child = raid_dir_table,
},
{ }
};
static const struct block_device_operations md_fops;
static int start_readonly;
/* bio_clone_mddev
* like bio_clone, but with a local bio set
*/
struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
struct mddev *mddev)
{
struct bio *b;
if (!mddev || !mddev->bio_set)
return bio_alloc(gfp_mask, nr_iovecs);
b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set);
if (!b)
return NULL;
return b;
}
EXPORT_SYMBOL_GPL(bio_alloc_mddev);
struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
struct mddev *mddev)
{
if (!mddev || !mddev->bio_set)
return bio_clone(bio, gfp_mask);
return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
}
EXPORT_SYMBOL_GPL(bio_clone_mddev);
void md_trim_bio(struct bio *bio, int offset, int size)
{
/* 'bio' is a cloned bio which we need to trim to match
* the given offset and size.
* This requires adjusting bi_sector, bi_size, and bi_io_vec
*/
int i;
struct bio_vec *bvec;
int sofar = 0;
size <<= 9;
if (offset == 0 && size == bio->bi_size)
return;
bio->bi_sector += offset;
bio->bi_size = size;
offset <<= 9;
clear_bit(BIO_SEG_VALID, &bio->bi_flags);
while (bio->bi_idx < bio->bi_vcnt &&
bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
/* remove this whole bio_vec */
offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
bio->bi_idx++;
}
if (bio->bi_idx < bio->bi_vcnt) {
bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
}
/* avoid any complications with bi_idx being non-zero*/
if (bio->bi_idx) {
memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
(bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
bio->bi_vcnt -= bio->bi_idx;
bio->bi_idx = 0;
}
/* Make sure vcnt and last bv are not too big */
bio_for_each_segment(bvec, bio, i) {
if (sofar + bvec->bv_len > size)
bvec->bv_len = size - sofar;
if (bvec->bv_len == 0) {
bio->bi_vcnt = i;
break;
}
sofar += bvec->bv_len;
}
}
EXPORT_SYMBOL_GPL(md_trim_bio);
/*
* We have a system wide 'event count' that is incremented
* on any 'interesting' event, and readers of /proc/mdstat
* can use 'poll' or 'select' to find out when the event
* count increases.
*
* Events are:
* start array, stop array, error, add device, remove device,
* start build, activate spare
*/
static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
static atomic_t md_event_count;
void md_new_event(struct mddev *mddev)
{
atomic_inc(&md_event_count);
wake_up(&md_event_waiters);
}
EXPORT_SYMBOL_GPL(md_new_event);
/* Alternate version that can be called from interrupts
* when calling sysfs_notify isn't needed.
*/
static void md_new_event_inintr(struct mddev *mddev)
{
atomic_inc(&md_event_count);
wake_up(&md_event_waiters);
}
/*
* Enables to iterate over all existing md arrays
* all_mddevs_lock protects this list.
*/
static LIST_HEAD(all_mddevs);
static DEFINE_SPINLOCK(all_mddevs_lock);
/*
* iterates through all used mddevs in the system.
* We take care to grab the all_mddevs_lock whenever navigating
* the list, and to always hold a refcount when unlocked.
* Any code which breaks out of this loop while own
* a reference to the current mddev and must mddev_put it.
*/
#define for_each_mddev(_mddev,_tmp) \
\
for (({ spin_lock(&all_mddevs_lock); \
_tmp = all_mddevs.next; \
_mddev = NULL;}); \
({ if (_tmp != &all_mddevs) \
mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
spin_unlock(&all_mddevs_lock); \
if (_mddev) mddev_put(_mddev); \
_mddev = list_entry(_tmp, struct mddev, all_mddevs); \
_tmp != &all_mddevs;}); \
({ spin_lock(&all_mddevs_lock); \
_tmp = _tmp->next;}) \
)
/* Rather than calling directly into the personality make_request function,
* IO requests come here first so that we can check if the device is
* being suspended pending a reconfiguration.
* We hold a refcount over the call to ->make_request. By the time that
* call has finished, the bio has been linked into some internal structure
* and so is visible to ->quiesce(), so we don't need the refcount any more.
*/
static void md_make_request(struct request_queue *q, struct bio *bio)
{
const int rw = bio_data_dir(bio);
struct mddev *mddev = q->queuedata;
int cpu;
unsigned int sectors;
if (mddev == NULL || mddev->pers == NULL
|| !mddev->ready) {
bio_io_error(bio);
return;
}
if (mddev->ro == 1 && unlikely(rw == WRITE)) {
bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS);
return;
}
smp_rmb(); /* Ensure implications of 'active' are visible */
rcu_read_lock();
if (mddev->suspended) {
DEFINE_WAIT(__wait);
for (;;) {
prepare_to_wait(&mddev->sb_wait, &__wait,
TASK_UNINTERRUPTIBLE);
if (!mddev->suspended)
break;
rcu_read_unlock();
schedule();
rcu_read_lock();
}
finish_wait(&mddev->sb_wait, &__wait);
}
atomic_inc(&mddev->active_io);
rcu_read_unlock();
/*
* save the sectors now since our bio can
* go away inside make_request
*/
sectors = bio_sectors(bio);
mddev->pers->make_request(mddev, bio);
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
part_stat_unlock();
if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
wake_up(&mddev->sb_wait);
}
/* mddev_suspend makes sure no new requests are submitted
* to the device, and that any requests that have been submitted
* are completely handled.
* Once ->stop is called and completes, the module will be completely
* unused.
*/
void mddev_suspend(struct mddev *mddev)
{
BUG_ON(mddev->suspended);
mddev->suspended = 1;
synchronize_rcu();
wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
mddev->pers->quiesce(mddev, 1);
del_timer_sync(&mddev->safemode_timer);
}
EXPORT_SYMBOL_GPL(mddev_suspend);
void mddev_resume(struct mddev *mddev)
{
mddev->suspended = 0;
wake_up(&mddev->sb_wait);
mddev->pers->quiesce(mddev, 0);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
}
EXPORT_SYMBOL_GPL(mddev_resume);
int mddev_congested(struct mddev *mddev, int bits)
{
return mddev->suspended;
}
EXPORT_SYMBOL(mddev_congested);
/*
* Generic flush handling for md
*/
static void md_end_flush(struct bio *bio, int err)
{
struct md_rdev *rdev = bio->bi_private;
struct mddev *mddev = rdev->mddev;
rdev_dec_pending(rdev, mddev);
if (atomic_dec_and_test(&mddev->flush_pending)) {
/* The pre-request flush has finished */
queue_work(md_wq, &mddev->flush_work);
}
bio_put(bio);
}
static void md_submit_flush_data(struct work_struct *ws);
static void submit_flushes(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, flush_work);
struct md_rdev *rdev;
INIT_WORK(&mddev->flush_work, md_submit_flush_data);
atomic_set(&mddev->flush_pending, 1);
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Faulty, &rdev->flags)) {
/* Take two references, one is dropped
* when request finishes, one after
* we reclaim rcu_read_lock
*/
struct bio *bi;
atomic_inc(&rdev->nr_pending);
atomic_inc(&rdev->nr_pending);
rcu_read_unlock();
bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
bi->bi_end_io = md_end_flush;
bi->bi_private = rdev;
bi->bi_bdev = rdev->bdev;
atomic_inc(&mddev->flush_pending);
submit_bio(WRITE_FLUSH, bi);
rcu_read_lock();
rdev_dec_pending(rdev, mddev);
}
rcu_read_unlock();
if (atomic_dec_and_test(&mddev->flush_pending))
queue_work(md_wq, &mddev->flush_work);
}
static void md_submit_flush_data(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, flush_work);
struct bio *bio = mddev->flush_bio;
if (bio->bi_size == 0)
/* an empty barrier - all done */
bio_endio(bio, 0);
else {
bio->bi_rw &= ~REQ_FLUSH;
mddev->pers->make_request(mddev, bio);
}
mddev->flush_bio = NULL;
wake_up(&mddev->sb_wait);
}
void md_flush_request(struct mddev *mddev, struct bio *bio)
{
spin_lock_irq(&mddev->write_lock);
wait_event_lock_irq(mddev->sb_wait,
!mddev->flush_bio,
mddev->write_lock);
mddev->flush_bio = bio;
spin_unlock_irq(&mddev->write_lock);
INIT_WORK(&mddev->flush_work, submit_flushes);
queue_work(md_wq, &mddev->flush_work);
}
EXPORT_SYMBOL(md_flush_request);
void md_unplug(struct blk_plug_cb *cb, bool from_schedule)
{
struct mddev *mddev = cb->data;
md_wakeup_thread(mddev->thread);
kfree(cb);
}
EXPORT_SYMBOL(md_unplug);
static inline struct mddev *mddev_get(struct mddev *mddev)
{
atomic_inc(&mddev->active);
return mddev;
}
static void mddev_delayed_delete(struct work_struct *ws);
static void mddev_put(struct mddev *mddev)
{
struct bio_set *bs = NULL;
if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
return;
if (!mddev->raid_disks && list_empty(&mddev->disks) &&
mddev->ctime == 0 && !mddev->hold_active) {
/* Array is not configured at all, and not held active,
* so destroy it */
list_del_init(&mddev->all_mddevs);
bs = mddev->bio_set;
mddev->bio_set = NULL;
if (mddev->gendisk) {
/* We did a probe so need to clean up. Call
* queue_work inside the spinlock so that
* flush_workqueue() after mddev_find will
* succeed in waiting for the work to be done.
*/
INIT_WORK(&mddev->del_work, mddev_delayed_delete);
queue_work(md_misc_wq, &mddev->del_work);
} else
kfree(mddev);
}
spin_unlock(&all_mddevs_lock);
if (bs)
bioset_free(bs);
}
void mddev_init(struct mddev *mddev)
{
mutex_init(&mddev->open_mutex);
mutex_init(&mddev->reconfig_mutex);
mutex_init(&mddev->bitmap_info.mutex);
INIT_LIST_HEAD(&mddev->disks);
INIT_LIST_HEAD(&mddev->all_mddevs);
init_timer(&mddev->safemode_timer);
atomic_set(&mddev->active, 1);
atomic_set(&mddev->openers, 0);
atomic_set(&mddev->active_io, 0);
spin_lock_init(&mddev->write_lock);
atomic_set(&mddev->flush_pending, 0);
init_waitqueue_head(&mddev->sb_wait);
init_waitqueue_head(&mddev->recovery_wait);
mddev->reshape_position = MaxSector;
mddev->reshape_backwards = 0;
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
mddev->level = LEVEL_NONE;
}
EXPORT_SYMBOL_GPL(mddev_init);
static struct mddev * mddev_find(dev_t unit)
{
struct mddev *mddev, *new = NULL;
if (unit && MAJOR(unit) != MD_MAJOR)
unit &= ~((1<<MdpMinorShift)-1);
retry:
spin_lock(&all_mddevs_lock);
if (unit) {
list_for_each_entry(mddev, &all_mddevs, all_mddevs)
if (mddev->unit == unit) {
mddev_get(mddev);
spin_unlock(&all_mddevs_lock);
kfree(new);
return mddev;
}
if (new) {
list_add(&new->all_mddevs, &all_mddevs);
spin_unlock(&all_mddevs_lock);
new->hold_active = UNTIL_IOCTL;
return new;
}
} else if (new) {
/* find an unused unit number */
static int next_minor = 512;
int start = next_minor;
int is_free = 0;
int dev = 0;
while (!is_free) {
dev = MKDEV(MD_MAJOR, next_minor);
next_minor++;
if (next_minor > MINORMASK)
next_minor = 0;
if (next_minor == start) {
/* Oh dear, all in use. */
spin_unlock(&all_mddevs_lock);
kfree(new);
return NULL;
}
is_free = 1;
list_for_each_entry(mddev, &all_mddevs, all_mddevs)
if (mddev->unit == dev) {
is_free = 0;
break;
}
}
new->unit = dev;
new->md_minor = MINOR(dev);
new->hold_active = UNTIL_STOP;
list_add(&new->all_mddevs, &all_mddevs);
spin_unlock(&all_mddevs_lock);
return new;
}
spin_unlock(&all_mddevs_lock);
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (!new)
return NULL;
new->unit = unit;
if (MAJOR(unit) == MD_MAJOR)
new->md_minor = MINOR(unit);
else
new->md_minor = MINOR(unit) >> MdpMinorShift;
mddev_init(new);
goto retry;
}
static inline int mddev_lock(struct mddev * mddev)
{
return mutex_lock_interruptible(&mddev->reconfig_mutex);
}
static inline int mddev_is_locked(struct mddev *mddev)
{
return mutex_is_locked(&mddev->reconfig_mutex);
}
static inline int mddev_trylock(struct mddev * mddev)
{
return mutex_trylock(&mddev->reconfig_mutex);
}
static struct attribute_group md_redundancy_group;
static void mddev_unlock(struct mddev * mddev)
{
if (mddev->to_remove) {
/* These cannot be removed under reconfig_mutex as
* an access to the files will try to take reconfig_mutex
* while holding the file unremovable, which leads to
* a deadlock.
* So hold set sysfs_active while the remove in happeing,
* and anything else which might set ->to_remove or my
* otherwise change the sysfs namespace will fail with
* -EBUSY if sysfs_active is still set.
* We set sysfs_active under reconfig_mutex and elsewhere
* test it under the same mutex to ensure its correct value
* is seen.
*/
struct attribute_group *to_remove = mddev->to_remove;
mddev->to_remove = NULL;
mddev->sysfs_active = 1;
mutex_unlock(&mddev->reconfig_mutex);
if (mddev->kobj.sd) {
if (to_remove != &md_redundancy_group)
sysfs_remove_group(&mddev->kobj, to_remove);
if (mddev->pers == NULL ||
mddev->pers->sync_request == NULL) {
sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
if (mddev->sysfs_action)
sysfs_put(mddev->sysfs_action);
mddev->sysfs_action = NULL;
}
}
mddev->sysfs_active = 0;
} else
mutex_unlock(&mddev->reconfig_mutex);
/* As we've dropped the mutex we need a spinlock to
* make sure the thread doesn't disappear
*/
spin_lock(&pers_lock);
md_wakeup_thread(mddev->thread);
spin_unlock(&pers_lock);
}
static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
{
struct md_rdev *rdev;
rdev_for_each(rdev, mddev)
if (rdev->desc_nr == nr)
return rdev;
return NULL;
}
static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr)
{
struct md_rdev *rdev;
rdev_for_each_rcu(rdev, mddev)
if (rdev->desc_nr == nr)
return rdev;
return NULL;
}
static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev)
{
struct md_rdev *rdev;
rdev_for_each(rdev, mddev)
if (rdev->bdev->bd_dev == dev)
return rdev;
return NULL;
}
static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev)
{
struct md_rdev *rdev;
rdev_for_each_rcu(rdev, mddev)
if (rdev->bdev->bd_dev == dev)
return rdev;
return NULL;
}
static struct md_personality *find_pers(int level, char *clevel)
{
struct md_personality *pers;
list_for_each_entry(pers, &pers_list, list) {
if (level != LEVEL_NONE && pers->level == level)
return pers;
if (strcmp(pers->name, clevel)==0)
return pers;
}
return NULL;
}
/* return the offset of the super block in 512byte sectors */
static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
{
sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
return MD_NEW_SIZE_SECTORS(num_sectors);
}
static int alloc_disk_sb(struct md_rdev * rdev)
{
if (rdev->sb_page)
MD_BUG();
rdev->sb_page = alloc_page(GFP_KERNEL);
if (!rdev->sb_page) {
printk(KERN_ALERT "md: out of memory.\n");
return -ENOMEM;
}
return 0;
}
void md_rdev_clear(struct md_rdev *rdev)
{
if (rdev->sb_page) {
put_page(rdev->sb_page);
rdev->sb_loaded = 0;
rdev->sb_page = NULL;
rdev->sb_start = 0;
rdev->sectors = 0;
}
if (rdev->bb_page) {
put_page(rdev->bb_page);
rdev->bb_page = NULL;
}
kfree(rdev->badblocks.page);
rdev->badblocks.page = NULL;
}
EXPORT_SYMBOL_GPL(md_rdev_clear);
static void super_written(struct bio *bio, int error)
{
struct md_rdev *rdev = bio->bi_private;
struct mddev *mddev = rdev->mddev;
if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
printk("md: super_written gets error=%d, uptodate=%d\n",
error, test_bit(BIO_UPTODATE, &bio->bi_flags));
WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
md_error(mddev, rdev);
}
if (atomic_dec_and_test(&mddev->pending_writes))
wake_up(&mddev->sb_wait);
bio_put(bio);
}
void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
sector_t sector, int size, struct page *page)
{
/* write first size bytes of page to sector of rdev
* Increment mddev->pending_writes before returning
* and decrement it on completion, waking up sb_wait
* if zero is reached.
* If an error occurred, call md_error
*/
struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
bio->bi_sector = sector;
bio_add_page(bio, page, size, 0);
bio->bi_private = rdev;
bio->bi_end_io = super_written;
atomic_inc(&mddev->pending_writes);
submit_bio(WRITE_FLUSH_FUA, bio);
}
void md_super_wait(struct mddev *mddev)
{
/* wait for all superblock writes that were scheduled to complete */
DEFINE_WAIT(wq);
for(;;) {
prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
if (atomic_read(&mddev->pending_writes)==0)
break;
schedule();
}
finish_wait(&mddev->sb_wait, &wq);
}
static void bi_complete(struct bio *bio, int error)
{
complete((struct completion*)bio->bi_private);
}
int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
struct page *page, int rw, bool metadata_op)
{
struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
struct completion event;
int ret;
rw |= REQ_SYNC;
bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
rdev->meta_bdev : rdev->bdev;
if (metadata_op)
bio->bi_sector = sector + rdev->sb_start;
else if (rdev->mddev->reshape_position != MaxSector &&
(rdev->mddev->reshape_backwards ==
(sector >= rdev->mddev->reshape_position)))
bio->bi_sector = sector + rdev->new_data_offset;
else
bio->bi_sector = sector + rdev->data_offset;
bio_add_page(bio, page, size, 0);
init_completion(&event);
bio->bi_private = &event;
bio->bi_end_io = bi_complete;
submit_bio(rw, bio);
wait_for_completion(&event);
ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
bio_put(bio);
return ret;
}
EXPORT_SYMBOL_GPL(sync_page_io);
static int read_disk_sb(struct md_rdev * rdev, int size)
{
char b[BDEVNAME_SIZE];
if (!rdev->sb_page) {
MD_BUG();
return -EINVAL;
}
if (rdev->sb_loaded)
return 0;
if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
goto fail;
rdev->sb_loaded = 1;
return 0;
fail:
printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
bdevname(rdev->bdev,b));
return -EINVAL;
}
static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
{
return sb1->set_uuid0 == sb2->set_uuid0 &&
sb1->set_uuid1 == sb2->set_uuid1 &&
sb1->set_uuid2 == sb2->set_uuid2 &&
sb1->set_uuid3 == sb2->set_uuid3;
}
static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
{
int ret;
mdp_super_t *tmp1, *tmp2;
tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
if (!tmp1 || !tmp2) {
ret = 0;
printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
goto abort;
}
*tmp1 = *sb1;
*tmp2 = *sb2;
/*
* nr_disks is not constant
*/
tmp1->nr_disks = 0;
tmp2->nr_disks = 0;
ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
abort:
kfree(tmp1);
kfree(tmp2);
return ret;
}
static u32 md_csum_fold(u32 csum)
{
csum = (csum & 0xffff) + (csum >> 16);
return (csum & 0xffff) + (csum >> 16);
}
static unsigned int calc_sb_csum(mdp_super_t * sb)
{
u64 newcsum = 0;
u32 *sb32 = (u32*)sb;
int i;
unsigned int disk_csum, csum;
disk_csum = sb->sb_csum;
sb->sb_csum = 0;
for (i = 0; i < MD_SB_BYTES/4 ; i++)
newcsum += sb32[i];
csum = (newcsum & 0xffffffff) + (newcsum>>32);
#ifdef CONFIG_ALPHA
/* This used to use csum_partial, which was wrong for several
* reasons including that different results are returned on
* different architectures. It isn't critical that we get exactly
* the same return value as before (we always csum_fold before
* testing, and that removes any differences). However as we
* know that csum_partial always returned a 16bit value on
* alphas, do a fold to maximise conformity to previous behaviour.
*/
sb->sb_csum = md_csum_fold(disk_csum);
#else
sb->sb_csum = disk_csum;
#endif
return csum;
}
/*
* Handle superblock details.
* We want to be able to handle multiple superblock formats
* so we have a common interface to them all, and an array of
* different handlers.
* We rely on user-space to write the initial superblock, and support
* reading and updating of superblocks.
* Interface methods are:
* int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
* loads and validates a superblock on dev.
* if refdev != NULL, compare superblocks on both devices
* Return:
* 0 - dev has a superblock that is compatible with refdev
* 1 - dev has a superblock that is compatible and newer than refdev
* so dev should be used as the refdev in future
* -EINVAL superblock incompatible or invalid
* -othererror e.g. -EIO
*
* int validate_super(struct mddev *mddev, struct md_rdev *dev)
* Verify that dev is acceptable into mddev.
* The first time, mddev->raid_disks will be 0, and data from
* dev should be merged in. Subsequent calls check that dev
* is new enough. Return 0 or -EINVAL
*
* void sync_super(struct mddev *mddev, struct md_rdev *dev)
* Update the superblock for rdev with data in mddev
* This does not write to disc.
*
*/
struct super_type {
char *name;
struct module *owner;
int (*load_super)(struct md_rdev *rdev,
struct md_rdev *refdev,
int minor_version);
int (*validate_super)(struct mddev *mddev,
struct md_rdev *rdev);
void (*sync_super)(struct mddev *mddev,
struct md_rdev *rdev);
unsigned long long (*rdev_size_change)(struct md_rdev *rdev,
sector_t num_sectors);
int (*allow_new_offset)(struct md_rdev *rdev,
unsigned long long new_offset);
};
/*
* Check that the given mddev has no bitmap.
*
* This function is called from the run method of all personalities that do not
* support bitmaps. It prints an error message and returns non-zero if mddev
* has a bitmap. Otherwise, it returns 0.
*
*/
int md_check_no_bitmap(struct mddev *mddev)
{
if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
return 0;
printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
mdname(mddev), mddev->pers->name);
return 1;
}
EXPORT_SYMBOL(md_check_no_bitmap);
/*
* load_super for 0.90.0
*/
static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
{
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
mdp_super_t *sb;
int ret;
/*
* Calculate the position of the superblock (512byte sectors),
* it's at the end of the disk.
*
* It also happens to be a multiple of 4Kb.
*/
rdev->sb_start = calc_dev_sboffset(rdev);
ret = read_disk_sb(rdev, MD_SB_BYTES);
if (ret) return ret;
ret = -EINVAL;
bdevname(rdev->bdev, b);
sb = page_address(rdev->sb_page);
if (sb->md_magic != MD_SB_MAGIC) {
printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
b);
goto abort;
}
if (sb->major_version != 0 ||
sb->minor_version < 90 ||
sb->minor_version > 91) {
printk(KERN_WARNING "Bad version number %d.%d on %s\n",
sb->major_version, sb->minor_version,
b);
goto abort;
}
if (sb->raid_disks <= 0)
goto abort;
if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
b);
goto abort;
}
rdev->preferred_minor = sb->md_minor;
rdev->data_offset = 0;
rdev->new_data_offset = 0;
rdev->sb_size = MD_SB_BYTES;
rdev->badblocks.shift = -1;
if (sb->level == LEVEL_MULTIPATH)
rdev->desc_nr = -1;
else
rdev->desc_nr = sb->this_disk.number;
if (!refdev) {
ret = 1;
} else {
__u64 ev1, ev2;
mdp_super_t *refsb = page_address(refdev->sb_page);
if (!uuid_equal(refsb, sb)) {
printk(KERN_WARNING "md: %s has different UUID to %s\n",
b, bdevname(refdev->bdev,b2));
goto abort;
}
if (!sb_equal(refsb, sb)) {
printk(KERN_WARNING "md: %s has same UUID"
" but different superblock to %s\n",
b, bdevname(refdev->bdev, b2));
goto abort;
}
ev1 = md_event(sb);
ev2 = md_event(refsb);
if (ev1 > ev2)
ret = 1;
else
ret = 0;
}
rdev->sectors = rdev->sb_start;
/* Limit to 4TB as metadata cannot record more than that.
* (not needed for Linear and RAID0 as metadata doesn't
* record this size)
*/
if (rdev->sectors >= (2ULL << 32) && sb->level >= 1)
rdev->sectors = (2ULL << 32) - 2;
if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
/* "this cannot possibly happen" ... */
ret = -EINVAL;
abort:
return ret;
}
/*
* validate_super for 0.90.0
*/
static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
{
mdp_disk_t *desc;
mdp_super_t *sb = page_address(rdev->sb_page);
__u64 ev1 = md_event(sb);
rdev->raid_disk = -1;
clear_bit(Faulty, &rdev->flags);
clear_bit(In_sync, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
if (mddev->raid_disks == 0) {
mddev->major_version = 0;
mddev->minor_version = sb->minor_version;
mddev->patch_version = sb->patch_version;
mddev->external = 0;
mddev->chunk_sectors = sb->chunk_size >> 9;
mddev->ctime = sb->ctime;
mddev->utime = sb->utime;
mddev->level = sb->level;
mddev->clevel[0] = 0;
mddev->layout = sb->layout;
mddev->raid_disks = sb->raid_disks;
mddev->dev_sectors = ((sector_t)sb->size) * 2;
mddev->events = ev1;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.space = 0;
/* bitmap can use 60 K after the 4K superblocks */
mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
mddev->reshape_backwards = 0;
if (mddev->minor_version >= 91) {
mddev->reshape_position = sb->reshape_position;
mddev->delta_disks = sb->delta_disks;
mddev->new_level = sb->new_level;
mddev->new_layout = sb->new_layout;
mddev->new_chunk_sectors = sb->new_chunk >> 9;
if (mddev->delta_disks < 0)
mddev->reshape_backwards = 1;
} else {
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
}
if (sb->state & (1<<MD_SB_CLEAN))
mddev->recovery_cp = MaxSector;
else {
if (sb->events_hi == sb->cp_events_hi &&
sb->events_lo == sb->cp_events_lo) {
mddev->recovery_cp = sb->recovery_cp;
} else
mddev->recovery_cp = 0;
}
memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
mddev->max_disks = MD_SB_DISKS;
if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
mddev->bitmap_info.file == NULL) {
mddev->bitmap_info.offset =
mddev->bitmap_info.default_offset;
mddev->bitmap_info.space =
mddev->bitmap_info.space;
}
} else if (mddev->pers == NULL) {
/* Insist on good event counter while assembling, except
* for spares (which don't need an event count) */
++ev1;
if (sb->disks[rdev->desc_nr].state & (
(1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
if (ev1 < mddev->events)
return -EINVAL;
} else if (mddev->bitmap) {
/* if adding to array with a bitmap, then we can accept an
* older device ... but not too old.
*/
if (ev1 < mddev->bitmap->events_cleared)
return 0;
} else {
if (ev1 < mddev->events)
/* just a hot-add of a new device, leave raid_disk at -1 */
return 0;
}
if (mddev->level != LEVEL_MULTIPATH) {
desc = sb->disks + rdev->desc_nr;
if (desc->state & (1<<MD_DISK_FAULTY))
set_bit(Faulty, &rdev->flags);
else if (desc->state & (1<<MD_DISK_SYNC) /* &&
desc->raid_disk < mddev->raid_disks */) {
set_bit(In_sync, &rdev->flags);
rdev->raid_disk = desc->raid_disk;
} else if (desc->state & (1<<MD_DISK_ACTIVE)) {
/* active but not in sync implies recovery up to
* reshape position. We don't know exactly where
* that is, so set to zero for now */
if (mddev->minor_version >= 91) {
rdev->recovery_offset = 0;
rdev->raid_disk = desc->raid_disk;
}
}
if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
set_bit(WriteMostly, &rdev->flags);
} else /* MULTIPATH are always insync */
set_bit(In_sync, &rdev->flags);
return 0;
}
/*
* sync_super for 0.90.0
*/
static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
{
mdp_super_t *sb;
struct md_rdev *rdev2;
int next_spare = mddev->raid_disks;
/* make rdev->sb match mddev data..
*
* 1/ zero out disks
* 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
* 3/ any empty disks < next_spare become removed
*
* disks[0] gets initialised to REMOVED because
* we cannot be sure from other fields if it has
* been initialised or not.
*/
int i;
int active=0, working=0,failed=0,spare=0,nr_disks=0;
rdev->sb_size = MD_SB_BYTES;
sb = page_address(rdev->sb_page);
memset(sb, 0, sizeof(*sb));
sb->md_magic = MD_SB_MAGIC;
sb->major_version = mddev->major_version;
sb->patch_version = mddev->patch_version;
sb->gvalid_words = 0; /* ignored */
memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
memcpy(&sb->set_uuid3, mddev->uuid+12,4);
sb->ctime = mddev->ctime;
sb->level = mddev->level;
sb->size = mddev->dev_sectors / 2;
sb->raid_disks = mddev->raid_disks;
sb->md_minor = mddev->md_minor;
sb->not_persistent = 0;
sb->utime = mddev->utime;
sb->state = 0;
sb->events_hi = (mddev->events>>32);
sb->events_lo = (u32)mddev->events;
if (mddev->reshape_position == MaxSector)
sb->minor_version = 90;
else {
sb->minor_version = 91;
sb->reshape_position = mddev->reshape_position;
sb->new_level = mddev->new_level;
sb->delta_disks = mddev->delta_disks;
sb->new_layout = mddev->new_layout;
sb->new_chunk = mddev->new_chunk_sectors << 9;
}
mddev->minor_version = sb->minor_version;
if (mddev->in_sync)
{
sb->recovery_cp = mddev->recovery_cp;
sb->cp_events_hi = (mddev->events>>32);
sb->cp_events_lo = (u32)mddev->events;
if (mddev->recovery_cp == MaxSector)
sb->state = (1<< MD_SB_CLEAN);
} else
sb->recovery_cp = 0;
sb->layout = mddev->layout;
sb->chunk_size = mddev->chunk_sectors << 9;
if (mddev->bitmap && mddev->bitmap_info.file == NULL)
sb->state |= (1<<MD_SB_BITMAP_PRESENT);
sb->disks[0].state = (1<<MD_DISK_REMOVED);
rdev_for_each(rdev2, mddev) {
mdp_disk_t *d;
int desc_nr;
int is_active = test_bit(In_sync, &rdev2->flags);
if (rdev2->raid_disk >= 0 &&
sb->minor_version >= 91)
/* we have nowhere to store the recovery_offset,
* but if it is not below the reshape_position,
* we can piggy-back on that.
*/
is_active = 1;
if (rdev2->raid_disk < 0 ||
test_bit(Faulty, &rdev2->flags))
is_active = 0;
if (is_active)
desc_nr = rdev2->raid_disk;
else
desc_nr = next_spare++;
rdev2->desc_nr = desc_nr;
d = &sb->disks[rdev2->desc_nr];
nr_disks++;
d->number = rdev2->desc_nr;
d->major = MAJOR(rdev2->bdev->bd_dev);
d->minor = MINOR(rdev2->bdev->bd_dev);
if (is_active)
d->raid_disk = rdev2->raid_disk;
else
d->raid_disk = rdev2->desc_nr; /* compatibility */
if (test_bit(Faulty, &rdev2->flags))
d->state = (1<<MD_DISK_FAULTY);
else if (is_active) {
d->state = (1<<MD_DISK_ACTIVE);
if (test_bit(In_sync, &rdev2->flags))
d->state |= (1<<MD_DISK_SYNC);
active++;
working++;
} else {
d->state = 0;
spare++;
working++;
}
if (test_bit(WriteMostly, &rdev2->flags))
d->state |= (1<<MD_DISK_WRITEMOSTLY);
}
/* now set the "removed" and "faulty" bits on any missing devices */
for (i=0 ; i < mddev->raid_disks ; i++) {
mdp_disk_t *d = &sb->disks[i];
if (d->state == 0 && d->number == 0) {
d->number = i;
d->raid_disk = i;
d->state = (1<<MD_DISK_REMOVED);
d->state |= (1<<MD_DISK_FAULTY);
failed++;
}
}
sb->nr_disks = nr_disks;
sb->active_disks = active;
sb->working_disks = working;
sb->failed_disks = failed;
sb->spare_disks = spare;
sb->this_disk = sb->disks[rdev->desc_nr];
sb->sb_csum = calc_sb_csum(sb);
}
/*
* rdev_size_change for 0.90.0
*/
static unsigned long long
super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
{
if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
return 0; /* component must fit device */
if (rdev->mddev->bitmap_info.offset)
return 0; /* can't move bitmap */
rdev->sb_start = calc_dev_sboffset(rdev);
if (!num_sectors || num_sectors > rdev->sb_start)
num_sectors = rdev->sb_start;
/* Limit to 4TB as metadata cannot record more than that.
* 4TB == 2^32 KB, or 2*2^32 sectors.
*/
if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1)
num_sectors = (2ULL << 32) - 2;
md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
rdev->sb_page);
md_super_wait(rdev->mddev);
return num_sectors;
}
static int
super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset)
{
/* non-zero offset changes not possible with v0.90 */
return new_offset == 0;
}
/*
* version 1 superblock
*/
static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
{
__le32 disk_csum;
u32 csum;
unsigned long long newcsum;
int size = 256 + le32_to_cpu(sb->max_dev)*2;
__le32 *isuper = (__le32*)sb;
disk_csum = sb->sb_csum;
sb->sb_csum = 0;
newcsum = 0;
for (; size >= 4; size -= 4)
newcsum += le32_to_cpu(*isuper++);
if (size == 2)
newcsum += le16_to_cpu(*(__le16*) isuper);
csum = (newcsum & 0xffffffff) + (newcsum >> 32);
sb->sb_csum = disk_csum;
return cpu_to_le32(csum);
}
static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
int acknowledged);
static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
{
struct mdp_superblock_1 *sb;
int ret;
sector_t sb_start;
sector_t sectors;
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
int bmask;
/*
* Calculate the position of the superblock in 512byte sectors.
* It is always aligned to a 4K boundary and
* depeding on minor_version, it can be:
* 0: At least 8K, but less than 12K, from end of device
* 1: At start of device
* 2: 4K from start of device.
*/
switch(minor_version) {
case 0:
sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
sb_start -= 8*2;
sb_start &= ~(sector_t)(4*2-1);
break;
case 1:
sb_start = 0;
break;
case 2:
sb_start = 8;
break;
default:
return -EINVAL;
}
rdev->sb_start = sb_start;
/* superblock is rarely larger than 1K, but it can be larger,
* and it is safe to read 4k, so we do that
*/
ret = read_disk_sb(rdev, 4096);
if (ret) return ret;
sb = page_address(rdev->sb_page);
if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
sb->major_version != cpu_to_le32(1) ||
le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
le64_to_cpu(sb->super_offset) != rdev->sb_start ||
(le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
return -EINVAL;
if (calc_sb_1_csum(sb) != sb->sb_csum) {
printk("md: invalid superblock checksum on %s\n",
bdevname(rdev->bdev,b));
return -EINVAL;
}
if (le64_to_cpu(sb->data_size) < 10) {
printk("md: data_size too small on %s\n",
bdevname(rdev->bdev,b));
return -EINVAL;
}
if (sb->pad0 ||
sb->pad3[0] ||
memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1])))
/* Some padding is non-zero, might be a new feature */
return -EINVAL;
rdev->preferred_minor = 0xffff;
rdev->data_offset = le64_to_cpu(sb->data_offset);
rdev->new_data_offset = rdev->data_offset;
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) &&
(le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset);
atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
if (rdev->sb_size & bmask)
rdev->sb_size = (rdev->sb_size | bmask) + 1;
if (minor_version
&& rdev->data_offset < sb_start + (rdev->sb_size/512))
return -EINVAL;
if (minor_version
&& rdev->new_data_offset < sb_start + (rdev->sb_size/512))
return -EINVAL;
if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
rdev->desc_nr = -1;
else
rdev->desc_nr = le32_to_cpu(sb->dev_number);
if (!rdev->bb_page) {
rdev->bb_page = alloc_page(GFP_KERNEL);
if (!rdev->bb_page)
return -ENOMEM;
}
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
rdev->badblocks.count == 0) {
/* need to load the bad block list.
* Currently we limit it to one page.
*/
s32 offset;
sector_t bb_sector;
u64 *bbp;
int i;
int sectors = le16_to_cpu(sb->bblog_size);
if (sectors > (PAGE_SIZE / 512))
return -EINVAL;
offset = le32_to_cpu(sb->bblog_offset);
if (offset == 0)
return -EINVAL;
bb_sector = (long long)offset;
if (!sync_page_io(rdev, bb_sector, sectors << 9,
rdev->bb_page, READ, true))
return -EIO;
bbp = (u64 *)page_address(rdev->bb_page);
rdev->badblocks.shift = sb->bblog_shift;
for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
u64 bb = le64_to_cpu(*bbp);
int count = bb & (0x3ff);
u64 sector = bb >> 10;
sector <<= sb->bblog_shift;
count <<= sb->bblog_shift;
if (bb + 1 == 0)
break;
if (md_set_badblocks(&rdev->badblocks,
sector, count, 1) == 0)
return -EINVAL;
}
} else if (sb->bblog_offset == 0)
rdev->badblocks.shift = -1;
if (!refdev) {
ret = 1;
} else {
__u64 ev1, ev2;
struct mdp_superblock_1 *refsb = page_address(refdev->sb_page);
if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
sb->level != refsb->level ||
sb->layout != refsb->layout ||
sb->chunksize != refsb->chunksize) {
printk(KERN_WARNING "md: %s has strangely different"
" superblock to %s\n",
bdevname(rdev->bdev,b),
bdevname(refdev->bdev,b2));
return -EINVAL;
}
ev1 = le64_to_cpu(sb->events);
ev2 = le64_to_cpu(refsb->events);
if (ev1 > ev2)
ret = 1;
else
ret = 0;
}
if (minor_version) {
sectors = (i_size_read(rdev->bdev->bd_inode) >> 9);
sectors -= rdev->data_offset;
} else
sectors = rdev->sb_start;
if (sectors < le64_to_cpu(sb->data_size))
return -EINVAL;
rdev->sectors = le64_to_cpu(sb->data_size);
return ret;
}
static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
{
struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
__u64 ev1 = le64_to_cpu(sb->events);
rdev->raid_disk = -1;
clear_bit(Faulty, &rdev->flags);
clear_bit(In_sync, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
if (mddev->raid_disks == 0) {
mddev->major_version = 1;
mddev->patch_version = 0;
mddev->external = 0;
mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
mddev->level = le32_to_cpu(sb->level);
mddev->clevel[0] = 0;
mddev->layout = le32_to_cpu(sb->layout);
mddev->raid_disks = le32_to_cpu(sb->raid_disks);
mddev->dev_sectors = le64_to_cpu(sb->size);
mddev->events = ev1;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.space = 0;
/* Default location for bitmap is 1K after superblock
* using 3K - total of 4K
*/
mddev->bitmap_info.default_offset = 1024 >> 9;
mddev->bitmap_info.default_space = (4096-1024) >> 9;
mddev->reshape_backwards = 0;
mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
memcpy(mddev->uuid, sb->set_uuid, 16);
mddev->max_disks = (4096-256)/2;
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
mddev->bitmap_info.file == NULL) {
mddev->bitmap_info.offset =
(__s32)le32_to_cpu(sb->bitmap_offset);
/* Metadata doesn't record how much space is available.
* For 1.0, we assume we can use up to the superblock
* if before, else to 4K beyond superblock.
* For others, assume no change is possible.
*/
if (mddev->minor_version > 0)
mddev->bitmap_info.space = 0;
else if (mddev->bitmap_info.offset > 0)
mddev->bitmap_info.space =
8 - mddev->bitmap_info.offset;
else
mddev->bitmap_info.space =
-mddev->bitmap_info.offset;
}
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
mddev->reshape_position = le64_to_cpu(sb->reshape_position);
mddev->delta_disks = le32_to_cpu(sb->delta_disks);
mddev->new_level = le32_to_cpu(sb->new_level);
mddev->new_layout = le32_to_cpu(sb->new_layout);
mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
if (mddev->delta_disks < 0 ||
(mddev->delta_disks == 0 &&
(le32_to_cpu(sb->feature_map)
& MD_FEATURE_RESHAPE_BACKWARDS)))
mddev->reshape_backwards = 1;
} else {
mddev->reshape_position = MaxSector;
mddev->delta_disks = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
}
} else if (mddev->pers == NULL) {
/* Insist of good event counter while assembling, except for
* spares (which don't need an event count) */
++ev1;
if (rdev->desc_nr >= 0 &&
rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
if (ev1 < mddev->events)
return -EINVAL;
} else if (mddev->bitmap) {
/* If adding to array with a bitmap, then we can accept an
* older device, but not too old.
*/
if (ev1 < mddev->bitmap->events_cleared)
return 0;
} else {
if (ev1 < mddev->events)
/* just a hot-add of a new device, leave raid_disk at -1 */
return 0;
}
if (mddev->level != LEVEL_MULTIPATH) {
int role;
if (rdev->desc_nr < 0 ||
rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
role = 0xffff;
rdev->desc_nr = -1;
} else
role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
switch(role) {
case 0xffff: /* spare */
break;
case 0xfffe: /* faulty */
set_bit(Faulty, &rdev->flags);
break;
default:
if ((le32_to_cpu(sb->feature_map) &
MD_FEATURE_RECOVERY_OFFSET))
rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
else
set_bit(In_sync, &rdev->flags);
rdev->raid_disk = role;
break;
}
if (sb->devflags & WriteMostly1)
set_bit(WriteMostly, &rdev->flags);
if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
set_bit(Replacement, &rdev->flags);
} else /* MULTIPATH are always insync */
set_bit(In_sync, &rdev->flags);
return 0;
}
static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
{
struct mdp_superblock_1 *sb;
struct md_rdev *rdev2;
int max_dev, i;
/* make rdev->sb match mddev and rdev data. */
sb = page_address(rdev->sb_page);
sb->feature_map = 0;
sb->pad0 = 0;
sb->recovery_offset = cpu_to_le64(0);
memset(sb->pad3, 0, sizeof(sb->pad3));
sb->utime = cpu_to_le64((__u64)mddev->utime);
sb->events = cpu_to_le64(mddev->events);
if (mddev->in_sync)
sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
else
sb->resync_offset = cpu_to_le64(0);
sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
sb->raid_disks = cpu_to_le32(mddev->raid_disks);
sb->size = cpu_to_le64(mddev->dev_sectors);
sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
sb->level = cpu_to_le32(mddev->level);
sb->layout = cpu_to_le32(mddev->layout);
if (test_bit(WriteMostly, &rdev->flags))
sb->devflags |= WriteMostly1;
else
sb->devflags &= ~WriteMostly1;
sb->data_offset = cpu_to_le64(rdev->data_offset);
sb->data_size = cpu_to_le64(rdev->sectors);
if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
}
if (rdev->raid_disk >= 0 &&
!test_bit(In_sync, &rdev->flags)) {
sb->feature_map |=
cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
sb->recovery_offset =
cpu_to_le64(rdev->recovery_offset);
}
if (test_bit(Replacement, &rdev->flags))
sb->feature_map |=
cpu_to_le32(MD_FEATURE_REPLACEMENT);
if (mddev->reshape_position != MaxSector) {
sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
sb->reshape_position = cpu_to_le64(mddev->reshape_position);
sb->new_layout = cpu_to_le32(mddev->new_layout);
sb->delta_disks = cpu_to_le32(mddev->delta_disks);
sb->new_level = cpu_to_le32(mddev->new_level);
sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
if (mddev->delta_disks == 0 &&
mddev->reshape_backwards)
sb->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS);
if (rdev->new_data_offset != rdev->data_offset) {
sb->feature_map
|= cpu_to_le32(MD_FEATURE_NEW_OFFSET);
sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset
- rdev->data_offset));
}
}
if (rdev->badblocks.count == 0)
/* Nothing to do for bad blocks*/ ;
else if (sb->bblog_offset == 0)
/* Cannot record bad blocks on this device */
md_error(mddev, rdev);
else {
struct badblocks *bb = &rdev->badblocks;
u64 *bbp = (u64 *)page_address(rdev->bb_page);
u64 *p = bb->page;
sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
if (bb->changed) {
unsigned seq;
retry:
seq = read_seqbegin(&bb->lock);
memset(bbp, 0xff, PAGE_SIZE);
for (i = 0 ; i < bb->count ; i++) {
u64 internal_bb = p[i];
u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
| BB_LEN(internal_bb));
bbp[i] = cpu_to_le64(store_bb);
}
bb->changed = 0;
if (read_seqretry(&bb->lock, seq))
goto retry;
bb->sector = (rdev->sb_start +
(int)le32_to_cpu(sb->bblog_offset));
bb->size = le16_to_cpu(sb->bblog_size);
}
}
max_dev = 0;
rdev_for_each(rdev2, mddev)
if (rdev2->desc_nr+1 > max_dev)
max_dev = rdev2->desc_nr+1;
if (max_dev > le32_to_cpu(sb->max_dev)) {
int bmask;
sb->max_dev = cpu_to_le32(max_dev);
rdev->sb_size = max_dev * 2 + 256;
bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
if (rdev->sb_size & bmask)
rdev->sb_size = (rdev->sb_size | bmask) + 1;
} else
max_dev = le32_to_cpu(sb->max_dev);
for (i=0; i<max_dev;i++)
sb->dev_roles[i] = cpu_to_le16(0xfffe);
rdev_for_each(rdev2, mddev) {
i = rdev2->desc_nr;
if (test_bit(Faulty, &rdev2->flags))
sb->dev_roles[i] = cpu_to_le16(0xfffe);
else if (test_bit(In_sync, &rdev2->flags))
sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
else if (rdev2->raid_disk >= 0)
sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
else
sb->dev_roles[i] = cpu_to_le16(0xffff);
}
sb->sb_csum = calc_sb_1_csum(sb);
}
static unsigned long long
super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
{
struct mdp_superblock_1 *sb;
sector_t max_sectors;
if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
return 0; /* component must fit device */
if (rdev->data_offset != rdev->new_data_offset)
return 0; /* too confusing */
if (rdev->sb_start < rdev->data_offset) {
/* minor versions 1 and 2; superblock before data */
max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
max_sectors -= rdev->data_offset;
if (!num_sectors || num_sectors > max_sectors)
num_sectors = max_sectors;
} else if (rdev->mddev->bitmap_info.offset) {
/* minor version 0 with bitmap we can't move */
return 0;
} else {
/* minor version 0; superblock after data */
sector_t sb_start;
sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
sb_start &= ~(sector_t)(4*2 - 1);
max_sectors = rdev->sectors + sb_start - rdev->sb_start;
if (!num_sectors || num_sectors > max_sectors)
num_sectors = max_sectors;
rdev->sb_start = sb_start;
}
sb = page_address(rdev->sb_page);
sb->data_size = cpu_to_le64(num_sectors);
sb->super_offset = rdev->sb_start;
sb->sb_csum = calc_sb_1_csum(sb);
md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
rdev->sb_page);
md_super_wait(rdev->mddev);
return num_sectors;
}
static int
super_1_allow_new_offset(struct md_rdev *rdev,
unsigned long long new_offset)
{
/* All necessary checks on new >= old have been done */
struct bitmap *bitmap;
if (new_offset >= rdev->data_offset)
return 1;
/* with 1.0 metadata, there is no metadata to tread on
* so we can always move back */
if (rdev->mddev->minor_version == 0)
return 1;
/* otherwise we must be sure not to step on
* any metadata, so stay:
* 36K beyond start of superblock
* beyond end of badblocks
* beyond write-intent bitmap
*/
if (rdev->sb_start + (32+4)*2 > new_offset)
return 0;
bitmap = rdev->mddev->bitmap;
if (bitmap && !rdev->mddev->bitmap_info.file &&
rdev->sb_start + rdev->mddev->bitmap_info.offset +
bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset)
return 0;
if (rdev->badblocks.sector + rdev->badblocks.size > new_offset)
return 0;
return 1;
}
static struct super_type super_types[] = {
[0] = {
.name = "0.90.0",
.owner = THIS_MODULE,
.load_super = super_90_load,
.validate_super = super_90_validate,
.sync_super = super_90_sync,
.rdev_size_change = super_90_rdev_size_change,
.allow_new_offset = super_90_allow_new_offset,
},
[1] = {
.name = "md-1",
.owner = THIS_MODULE,
.load_super = super_1_load,
.validate_super = super_1_validate,
.sync_super = super_1_sync,
.rdev_size_change = super_1_rdev_size_change,
.allow_new_offset = super_1_allow_new_offset,
},
};
static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
{
if (mddev->sync_super) {
mddev->sync_super(mddev, rdev);
return;
}
BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
super_types[mddev->major_version].sync_super(mddev, rdev);
}
static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
{
struct md_rdev *rdev, *rdev2;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev1)
rdev_for_each_rcu(rdev2, mddev2)
if (rdev->bdev->bd_contains ==
rdev2->bdev->bd_contains) {
rcu_read_unlock();
return 1;
}
rcu_read_unlock();
return 0;
}
static LIST_HEAD(pending_raid_disks);
/*
* Try to register data integrity profile for an mddev
*
* This is called when an array is started and after a disk has been kicked
* from the array. It only succeeds if all working and active component devices
* are integrity capable with matching profiles.
*/
int md_integrity_register(struct mddev *mddev)
{
struct md_rdev *rdev, *reference = NULL;
if (list_empty(&mddev->disks))
return 0; /* nothing to do */
if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
return 0; /* shouldn't register, or already is */
rdev_for_each(rdev, mddev) {
/* skip spares and non-functional disks */
if (test_bit(Faulty, &rdev->flags))
continue;
if (rdev->raid_disk < 0)
continue;
if (!reference) {
/* Use the first rdev as the reference */
reference = rdev;
continue;
}
/* does this rdev's profile match the reference profile? */
if (blk_integrity_compare(reference->bdev->bd_disk,
rdev->bdev->bd_disk) < 0)
return -EINVAL;
}
if (!reference || !bdev_get_integrity(reference->bdev))
return 0;
/*
* All component devices are integrity capable and have matching
* profiles, register the common profile for the md device.
*/
if (blk_integrity_register(mddev->gendisk,
bdev_get_integrity(reference->bdev)) != 0) {
printk(KERN_ERR "md: failed to register integrity for %s\n",
mdname(mddev));
return -EINVAL;
}
printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
printk(KERN_ERR "md: failed to create integrity pool for %s\n",
mdname(mddev));
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(md_integrity_register);
/* Disable data integrity if non-capable/non-matching disk is being added */
void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
{
struct blk_integrity *bi_rdev;
struct blk_integrity *bi_mddev;
if (!mddev->gendisk)
return;
bi_rdev = bdev_get_integrity(rdev->bdev);
bi_mddev = blk_get_integrity(mddev->gendisk);
if (!bi_mddev) /* nothing to do */
return;
if (rdev->raid_disk < 0) /* skip spares */
return;
if (bi_rdev && blk_integrity_compare(mddev->gendisk,
rdev->bdev->bd_disk) >= 0)
return;
printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
blk_integrity_unregister(mddev->gendisk);
}
EXPORT_SYMBOL(md_integrity_add_rdev);
static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
{
char b[BDEVNAME_SIZE];
struct kobject *ko;
char *s;
int err;
if (rdev->mddev) {
MD_BUG();
return -EINVAL;
}
/* prevent duplicates */
if (find_rdev(mddev, rdev->bdev->bd_dev))
return -EEXIST;
/* make sure rdev->sectors exceeds mddev->dev_sectors */
if (rdev->sectors && (mddev->dev_sectors == 0 ||
rdev->sectors < mddev->dev_sectors)) {
if (mddev->pers) {
/* Cannot change size, so fail
* If mddev->level <= 0, then we don't care
* about aligning sizes (e.g. linear)
*/
if (mddev->level > 0)
return -ENOSPC;
} else
mddev->dev_sectors = rdev->sectors;
}
/* Verify rdev->desc_nr is unique.
* If it is -1, assign a free number, else
* check number is not in use
*/
if (rdev->desc_nr < 0) {
int choice = 0;
if (mddev->pers) choice = mddev->raid_disks;
while (find_rdev_nr(mddev, choice))
choice++;
rdev->desc_nr = choice;
} else {
if (find_rdev_nr(mddev, rdev->desc_nr))
return -EBUSY;
}
if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
mdname(mddev), mddev->max_disks);
return -EBUSY;
}
bdevname(rdev->bdev,b);
while ( (s=strchr(b, '/')) != NULL)
*s = '!';
rdev->mddev = mddev;
printk(KERN_INFO "md: bind<%s>\n", b);
if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
goto fail;
ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
if (sysfs_create_link(&rdev->kobj, ko, "block"))
/* failure here is OK */;
rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
list_add_rcu(&rdev->same_set, &mddev->disks);
bd_link_disk_holder(rdev->bdev, mddev->gendisk);
/* May as well allow recovery to be retried once */
mddev->recovery_disabled++;
return 0;
fail:
printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
b, mdname(mddev));
return err;
}
static void md_delayed_delete(struct work_struct *ws)
{
struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
kobject_del(&rdev->kobj);
kobject_put(&rdev->kobj);
}
static void unbind_rdev_from_array(struct md_rdev * rdev)
{
char b[BDEVNAME_SIZE];
if (!rdev->mddev) {
MD_BUG();
return;
}
bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
list_del_rcu(&rdev->same_set);
printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
rdev->mddev = NULL;
sysfs_remove_link(&rdev->kobj, "block");
sysfs_put(rdev->sysfs_state);
rdev->sysfs_state = NULL;
rdev->badblocks.count = 0;
/* We need to delay this, otherwise we can deadlock when
* writing to 'remove' to "dev/state". We also need
* to delay it due to rcu usage.
*/
synchronize_rcu();
INIT_WORK(&rdev->del_work, md_delayed_delete);
kobject_get(&rdev->kobj);
queue_work(md_misc_wq, &rdev->del_work);
}
/*
* prevent the device from being mounted, repartitioned or
* otherwise reused by a RAID array (or any other kernel
* subsystem), by bd_claiming the device.
*/
static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared)
{
int err = 0;
struct block_device *bdev;
char b[BDEVNAME_SIZE];
bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
shared ? (struct md_rdev *)lock_rdev : rdev);
if (IS_ERR(bdev)) {
printk(KERN_ERR "md: could not open %s.\n",
__bdevname(dev, b));
return PTR_ERR(bdev);
}
rdev->bdev = bdev;
return err;
}
static void unlock_rdev(struct md_rdev *rdev)
{
struct block_device *bdev = rdev->bdev;
rdev->bdev = NULL;
if (!bdev)
MD_BUG();
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}
void md_autodetect_dev(dev_t dev);
static void export_rdev(struct md_rdev * rdev)
{
char b[BDEVNAME_SIZE];
printk(KERN_INFO "md: export_rdev(%s)\n",
bdevname(rdev->bdev,b));
if (rdev->mddev)
MD_BUG();
md_rdev_clear(rdev);
#ifndef MODULE
if (test_bit(AutoDetected, &rdev->flags))
md_autodetect_dev(rdev->bdev->bd_dev);
#endif
unlock_rdev(rdev);
kobject_put(&rdev->kobj);
}
static void kick_rdev_from_array(struct md_rdev * rdev)
{
unbind_rdev_from_array(rdev);
export_rdev(rdev);
}
static void export_array(struct mddev *mddev)
{
struct md_rdev *rdev, *tmp;
rdev_for_each_safe(rdev, tmp, mddev) {
if (!rdev->mddev) {
MD_BUG();
continue;
}
kick_rdev_from_array(rdev);
}
if (!list_empty(&mddev->disks))
MD_BUG();
mddev->raid_disks = 0;
mddev->major_version = 0;
}
static void print_desc(mdp_disk_t *desc)
{
printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
desc->major,desc->minor,desc->raid_disk,desc->state);
}
static void print_sb_90(mdp_super_t *sb)
{
int i;
printk(KERN_INFO
"md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
sb->major_version, sb->minor_version, sb->patch_version,
sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
sb->ctime);
printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
sb->level, sb->size, sb->nr_disks, sb->raid_disks,
sb->md_minor, sb->layout, sb->chunk_size);
printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
" FD:%d SD:%d CSUM:%08x E:%08lx\n",
sb->utime, sb->state, sb->active_disks, sb->working_disks,
sb->failed_disks, sb->spare_disks,
sb->sb_csum, (unsigned long)sb->events_lo);
printk(KERN_INFO);
for (i = 0; i < MD_SB_DISKS; i++) {
mdp_disk_t *desc;
desc = sb->disks + i;
if (desc->number || desc->major || desc->minor ||
desc->raid_disk || (desc->state && (desc->state != 4))) {
printk(" D %2d: ", i);
print_desc(desc);
}
}
printk(KERN_INFO "md: THIS: ");
print_desc(&sb->this_disk);
}
static void print_sb_1(struct mdp_superblock_1 *sb)
{
__u8 *uuid;
uuid = sb->set_uuid;
printk(KERN_INFO
"md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
"md: Name: \"%s\" CT:%llu\n",
le32_to_cpu(sb->major_version),
le32_to_cpu(sb->feature_map),
uuid,
sb->set_name,
(unsigned long long)le64_to_cpu(sb->ctime)
& MD_SUPERBLOCK_1_TIME_SEC_MASK);
uuid = sb->device_uuid;
printk(KERN_INFO
"md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
" RO:%llu\n"
"md: Dev:%08x UUID: %pU\n"
"md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
"md: (MaxDev:%u) \n",
le32_to_cpu(sb->level),
(unsigned long long)le64_to_cpu(sb->size),
le32_to_cpu(sb->raid_disks),
le32_to_cpu(sb->layout),
le32_to_cpu(sb->chunksize),
(unsigned long long)le64_to_cpu(sb->data_offset),
(unsigned long long)le64_to_cpu(sb->data_size),
(unsigned long long)le64_to_cpu(sb->super_offset),
(unsigned long long)le64_to_cpu(sb->recovery_offset),
le32_to_cpu(sb->dev_number),
uuid,
sb->devflags,
(unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
(unsigned long long)le64_to_cpu(sb->events),
(unsigned long long)le64_to_cpu(sb->resync_offset),
le32_to_cpu(sb->sb_csum),
le32_to_cpu(sb->max_dev)
);
}
static void print_rdev(struct md_rdev *rdev, int major_version)
{
char b[BDEVNAME_SIZE];
printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
rdev->desc_nr);
if (rdev->sb_loaded) {
printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
switch (major_version) {
case 0:
print_sb_90(page_address(rdev->sb_page));
break;
case 1:
print_sb_1(page_address(rdev->sb_page));
break;
}
} else
printk(KERN_INFO "md: no rdev superblock!\n");
}
static void md_print_devices(void)
{
struct list_head *tmp;
struct md_rdev *rdev;
struct mddev *mddev;
char b[BDEVNAME_SIZE];
printk("\n");
printk("md: **********************************\n");
printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
printk("md: **********************************\n");
for_each_mddev(mddev, tmp) {
if (mddev->bitmap)
bitmap_print_sb(mddev->bitmap);
else
printk("%s: ", mdname(mddev));
rdev_for_each(rdev, mddev)
printk("<%s>", bdevname(rdev->bdev,b));
printk("\n");
rdev_for_each(rdev, mddev)
print_rdev(rdev, mddev->major_version);
}
printk("md: **********************************\n");
printk("\n");
}
static void sync_sbs(struct mddev * mddev, int nospares)
{
/* Update each superblock (in-memory image), but
* if we are allowed to, skip spares which already
* have the right event counter, or have one earlier
* (which would mean they aren't being marked as dirty
* with the rest of the array)
*/
struct md_rdev *rdev;
rdev_for_each(rdev, mddev) {
if (rdev->sb_events == mddev->events ||
(nospares &&
rdev->raid_disk < 0 &&
rdev->sb_events+1 == mddev->events)) {
/* Don't update this superblock */
rdev->sb_loaded = 2;
} else {
sync_super(mddev, rdev);
rdev->sb_loaded = 1;
}
}
}
static void md_update_sb(struct mddev * mddev, int force_change)
{
struct md_rdev *rdev;
int sync_req;
int nospares = 0;
int any_badblocks_changed = 0;
repeat:
/* First make sure individual recovery_offsets are correct */
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk >= 0 &&
mddev->delta_disks >= 0 &&
!test_bit(In_sync, &rdev->flags) &&
mddev->curr_resync_completed > rdev->recovery_offset)
rdev->recovery_offset = mddev->curr_resync_completed;
}
if (!mddev->persistent) {
clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
clear_bit(MD_CHANGE_DEVS, &mddev->flags);
if (!mddev->external) {
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
rdev_for_each(rdev, mddev) {
if (rdev->badblocks.changed) {
rdev->badblocks.changed = 0;
md_ack_all_badblocks(&rdev->badblocks);
md_error(mddev, rdev);
}
clear_bit(Blocked, &rdev->flags);
clear_bit(BlockedBadBlocks, &rdev->flags);
wake_up(&rdev->blocked_wait);
}
}
wake_up(&mddev->sb_wait);
return;
}
spin_lock_irq(&mddev->write_lock);
mddev->utime = get_seconds();
if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
force_change = 1;
if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
/* just a clean<-> dirty transition, possibly leave spares alone,
* though if events isn't the right even/odd, we will have to do
* spares after all
*/
nospares = 1;
if (force_change)
nospares = 0;
if (mddev->degraded)
/* If the array is degraded, then skipping spares is both
* dangerous and fairly pointless.
* Dangerous because a device that was removed from the array
* might have a event_count that still looks up-to-date,
* so it can be re-added without a resync.
* Pointless because if there are any spares to skip,
* then a recovery will happen and soon that array won't
* be degraded any more and the spare can go back to sleep then.
*/
nospares = 0;
sync_req = mddev->in_sync;
/* If this is just a dirty<->clean transition, and the array is clean
* and 'events' is odd, we can roll back to the previous clean state */
if (nospares
&& (mddev->in_sync && mddev->recovery_cp == MaxSector)
&& mddev->can_decrease_events
&& mddev->events != 1) {
mddev->events--;
mddev->can_decrease_events = 0;
} else {
/* otherwise we have to go forward and ... */
mddev->events ++;
mddev->can_decrease_events = nospares;
}
if (!mddev->events) {
/*
* oops, this 64-bit counter should never wrap.
* Either we are in around ~1 trillion A.C., assuming
* 1 reboot per second, or we have a bug:
*/
MD_BUG();
mddev->events --;
}
rdev_for_each(rdev, mddev) {
if (rdev->badblocks.changed)
any_badblocks_changed++;
if (test_bit(Faulty, &rdev->flags))
set_bit(FaultRecorded, &rdev->flags);
}
sync_sbs(mddev, nospares);
spin_unlock_irq(&mddev->write_lock);
pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
mdname(mddev), mddev->in_sync);
bitmap_update_sb(mddev->bitmap);
rdev_for_each(rdev, mddev) {
char b[BDEVNAME_SIZE];
if (rdev->sb_loaded != 1)
continue; /* no noise on spare devices */
if (!test_bit(Faulty, &rdev->flags) &&
rdev->saved_raid_disk == -1) {
md_super_write(mddev,rdev,
rdev->sb_start, rdev->sb_size,
rdev->sb_page);
pr_debug("md: (write) %s's sb offset: %llu\n",
bdevname(rdev->bdev, b),
(unsigned long long)rdev->sb_start);
rdev->sb_events = mddev->events;
if (rdev->badblocks.size) {
md_super_write(mddev, rdev,
rdev->badblocks.sector,
rdev->badblocks.size << 9,
rdev->bb_page);
rdev->badblocks.size = 0;
}
} else if (test_bit(Faulty, &rdev->flags))
pr_debug("md: %s (skipping faulty)\n",
bdevname(rdev->bdev, b));
else
pr_debug("(skipping incremental s/r ");
if (mddev->level == LEVEL_MULTIPATH)
/* only need to write one superblock... */
break;
}
md_super_wait(mddev);
/* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
spin_lock_irq(&mddev->write_lock);
if (mddev->in_sync != sync_req ||
test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
/* have to write it out again */
spin_unlock_irq(&mddev->write_lock);
goto repeat;
}
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
spin_unlock_irq(&mddev->write_lock);
wake_up(&mddev->sb_wait);
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
rdev_for_each(rdev, mddev) {
if (test_and_clear_bit(FaultRecorded, &rdev->flags))
clear_bit(Blocked, &rdev->flags);
if (any_badblocks_changed)
md_ack_all_badblocks(&rdev->badblocks);
clear_bit(BlockedBadBlocks, &rdev->flags);
wake_up(&rdev->blocked_wait);
}
}
/* words written to sysfs files may, or may not, be \n terminated.
* We want to accept with case. For this we use cmd_match.
*/
static int cmd_match(const char *cmd, const char *str)
{
/* See if cmd, written into a sysfs file, matches
* str. They must either be the same, or cmd can
* have a trailing newline
*/
while (*cmd && *str && *cmd == *str) {
cmd++;
str++;
}
if (*cmd == '\n')
cmd++;
if (*str || *cmd)
return 0;
return 1;
}
struct rdev_sysfs_entry {
struct attribute attr;
ssize_t (*show)(struct md_rdev *, char *);
ssize_t (*store)(struct md_rdev *, const char *, size_t);
};
static ssize_t
state_show(struct md_rdev *rdev, char *page)
{
char *sep = "";
size_t len = 0;
if (test_bit(Faulty, &rdev->flags) ||
rdev->badblocks.unacked_exist) {
len+= sprintf(page+len, "%sfaulty",sep);
sep = ",";
}
if (test_bit(In_sync, &rdev->flags)) {
len += sprintf(page+len, "%sin_sync",sep);
sep = ",";
}
if (test_bit(WriteMostly, &rdev->flags)) {
len += sprintf(page+len, "%swrite_mostly",sep);
sep = ",";
}
if (test_bit(Blocked, &rdev->flags) ||
(rdev->badblocks.unacked_exist
&& !test_bit(Faulty, &rdev->flags))) {
len += sprintf(page+len, "%sblocked", sep);
sep = ",";
}
if (!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags)) {
len += sprintf(page+len, "%sspare", sep);
sep = ",";
}
if (test_bit(WriteErrorSeen, &rdev->flags)) {
len += sprintf(page+len, "%swrite_error", sep);
sep = ",";
}
if (test_bit(WantReplacement, &rdev->flags)) {
len += sprintf(page+len, "%swant_replacement", sep);
sep = ",";
}
if (test_bit(Replacement, &rdev->flags)) {
len += sprintf(page+len, "%sreplacement", sep);
sep = ",";
}
return len+sprintf(page+len, "\n");
}
static ssize_t
state_store(struct md_rdev *rdev, const char *buf, size_t len)
{
/* can write
* faulty - simulates an error
* remove - disconnects the device
* writemostly - sets write_mostly
* -writemostly - clears write_mostly
* blocked - sets the Blocked flags
* -blocked - clears the Blocked and possibly simulates an error
* insync - sets Insync providing device isn't active
* write_error - sets WriteErrorSeen
* -write_error - clears WriteErrorSeen
*/
int err = -EINVAL;
if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
md_error(rdev->mddev, rdev);
if (test_bit(Faulty, &rdev->flags))
err = 0;
else
err = -EBUSY;
} else if (cmd_match(buf, "remove")) {
if (rdev->raid_disk >= 0)
err = -EBUSY;
else {
struct mddev *mddev = rdev->mddev;
kick_rdev_from_array(rdev);
if (mddev->pers)
md_update_sb(mddev, 1);
md_new_event(mddev);
err = 0;
}
} else if (cmd_match(buf, "writemostly")) {
set_bit(WriteMostly, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "-writemostly")) {
clear_bit(WriteMostly, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "blocked")) {
set_bit(Blocked, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "-blocked")) {
if (!test_bit(Faulty, &rdev->flags) &&
rdev->badblocks.unacked_exist) {
/* metadata handler doesn't understand badblocks,
* so we need to fail the device
*/
md_error(rdev->mddev, rdev);
}
clear_bit(Blocked, &rdev->flags);
clear_bit(BlockedBadBlocks, &rdev->flags);
wake_up(&rdev->blocked_wait);
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
err = 0;
} else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
set_bit(In_sync, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "write_error")) {
set_bit(WriteErrorSeen, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "-write_error")) {
clear_bit(WriteErrorSeen, &rdev->flags);
err = 0;
} else if (cmd_match(buf, "want_replacement")) {
/* Any non-spare device that is not a replacement can
* become want_replacement at any time, but we then need to
* check if recovery is needed.
*/
if (rdev->raid_disk >= 0 &&
!test_bit(Replacement, &rdev->flags))
set_bit(WantReplacement, &rdev->flags);
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
err = 0;
} else if (cmd_match(buf, "-want_replacement")) {
/* Clearing 'want_replacement' is always allowed.
* Once replacements starts it is too late though.
*/
err = 0;
clear_bit(WantReplacement, &rdev->flags);
} else if (cmd_match(buf, "replacement")) {
/* Can only set a device as a replacement when array has not
* yet been started. Once running, replacement is automatic
* from spares, or by assigning 'slot'.
*/
if (rdev->mddev->pers)
err = -EBUSY;
else {
set_bit(Replacement, &rdev->flags);
err = 0;
}
} else if (cmd_match(buf, "-replacement")) {
/* Similarly, can only clear Replacement before start */
if (rdev->mddev->pers)
err = -EBUSY;
else {
clear_bit(Replacement, &rdev->flags);
err = 0;
}
}
if (!err)
sysfs_notify_dirent_safe(rdev->sysfs_state);
return err ? err : len;
}
static struct rdev_sysfs_entry rdev_state =
__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
static ssize_t
errors_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
}
static ssize_t
errors_store(struct md_rdev *rdev, const char *buf, size_t len)
{
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
if (*buf && (*e == 0 || *e == '\n')) {
atomic_set(&rdev->corrected_errors, n);
return len;
}
return -EINVAL;
}
static struct rdev_sysfs_entry rdev_errors =
__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
static ssize_t
slot_show(struct md_rdev *rdev, char *page)
{
if (rdev->raid_disk < 0)
return sprintf(page, "none\n");
else
return sprintf(page, "%d\n", rdev->raid_disk);
}
static ssize_t
slot_store(struct md_rdev *rdev, const char *buf, size_t len)
{
char *e;
int err;
int slot = simple_strtoul(buf, &e, 10);
if (strncmp(buf, "none", 4)==0)
slot = -1;
else if (e==buf || (*e && *e!= '\n'))
return -EINVAL;
if (rdev->mddev->pers && slot == -1) {
/* Setting 'slot' on an active array requires also
* updating the 'rd%d' link, and communicating
* with the personality with ->hot_*_disk.
* For now we only support removing
* failed/spare devices. This normally happens automatically,
* but not when the metadata is externally managed.
*/
if (rdev->raid_disk == -1)
return -EEXIST;
/* personality does all needed checks */
if (rdev->mddev->pers->hot_remove_disk == NULL)
return -EINVAL;
err = rdev->mddev->pers->
hot_remove_disk(rdev->mddev, rdev);
if (err)
return err;
sysfs_unlink_rdev(rdev->mddev, rdev);
rdev->raid_disk = -1;
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
} else if (rdev->mddev->pers) {
/* Activating a spare .. or possibly reactivating
* if we ever get bitmaps working here.
*/
if (rdev->raid_disk != -1)
return -EBUSY;
if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
return -EBUSY;
if (rdev->mddev->pers->hot_add_disk == NULL)
return -EINVAL;
if (slot >= rdev->mddev->raid_disks &&
slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
return -ENOSPC;
rdev->raid_disk = slot;
if (test_bit(In_sync, &rdev->flags))
rdev->saved_raid_disk = slot;
else
rdev->saved_raid_disk = -1;
clear_bit(In_sync, &rdev->flags);
err = rdev->mddev->pers->
hot_add_disk(rdev->mddev, rdev);
if (err) {
rdev->raid_disk = -1;
return err;
} else
sysfs_notify_dirent_safe(rdev->sysfs_state);
if (sysfs_link_rdev(rdev->mddev, rdev))
/* failure here is OK */;
/* don't wakeup anyone, leave that to userspace. */
} else {
if (slot >= rdev->mddev->raid_disks &&
slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
return -ENOSPC;
rdev->raid_disk = slot;
/* assume it is working */
clear_bit(Faulty, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
set_bit(In_sync, &rdev->flags);
sysfs_notify_dirent_safe(rdev->sysfs_state);
}
return len;
}
static struct rdev_sysfs_entry rdev_slot =
__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
static ssize_t
offset_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
}
static ssize_t
offset_store(struct md_rdev *rdev, const char *buf, size_t len)
{
unsigned long long offset;
if (strict_strtoull(buf, 10, &offset) < 0)
return -EINVAL;
if (rdev->mddev->pers && rdev->raid_disk >= 0)
return -EBUSY;
if (rdev->sectors && rdev->mddev->external)
/* Must set offset before size, so overlap checks
* can be sane */
return -EBUSY;
rdev->data_offset = offset;
rdev->new_data_offset = offset;
return len;
}
static struct rdev_sysfs_entry rdev_offset =
__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
static ssize_t new_offset_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long)rdev->new_data_offset);
}
static ssize_t new_offset_store(struct md_rdev *rdev,
const char *buf, size_t len)
{
unsigned long long new_offset;
struct mddev *mddev = rdev->mddev;
if (strict_strtoull(buf, 10, &new_offset) < 0)
return -EINVAL;
if (mddev->sync_thread)
return -EBUSY;
if (new_offset == rdev->data_offset)
/* reset is always permitted */
;
else if (new_offset > rdev->data_offset) {
/* must not push array size beyond rdev_sectors */
if (new_offset - rdev->data_offset
+ mddev->dev_sectors > rdev->sectors)
return -E2BIG;
}
/* Metadata worries about other space details. */
/* decreasing the offset is inconsistent with a backwards
* reshape.
*/
if (new_offset < rdev->data_offset &&
mddev->reshape_backwards)
return -EINVAL;
/* Increasing offset is inconsistent with forwards
* reshape. reshape_direction should be set to
* 'backwards' first.
*/
if (new_offset > rdev->data_offset &&
!mddev->reshape_backwards)
return -EINVAL;
if (mddev->pers && mddev->persistent &&
!super_types[mddev->major_version]
.allow_new_offset(rdev, new_offset))
return -E2BIG;
rdev->new_data_offset = new_offset;
if (new_offset > rdev->data_offset)
mddev->reshape_backwards = 1;
else if (new_offset < rdev->data_offset)
mddev->reshape_backwards = 0;
return len;
}
static struct rdev_sysfs_entry rdev_new_offset =
__ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store);
static ssize_t
rdev_size_show(struct md_rdev *rdev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
}
static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
{
/* check if two start/length pairs overlap */
if (s1+l1 <= s2)
return 0;
if (s2+l2 <= s1)
return 0;
return 1;
}
static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
{
unsigned long long blocks;
sector_t new;
if (strict_strtoull(buf, 10, &blocks) < 0)
return -EINVAL;
if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
return -EINVAL; /* sector conversion overflow */
new = blocks * 2;
if (new != blocks * 2)
return -EINVAL; /* unsigned long long to sector_t overflow */
*sectors = new;
return 0;
}
static ssize_t
rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
{
struct mddev *my_mddev = rdev->mddev;
sector_t oldsectors = rdev->sectors;
sector_t sectors;
if (strict_blocks_to_sectors(buf, &sectors) < 0)
return -EINVAL;
if (rdev->data_offset != rdev->new_data_offset)
return -EINVAL; /* too confusing */
if (my_mddev->pers && rdev->raid_disk >= 0) {
if (my_mddev->persistent) {
sectors = super_types[my_mddev->major_version].
rdev_size_change(rdev, sectors);
if (!sectors)
return -EBUSY;
} else if (!sectors)
sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
rdev->data_offset;
if (!my_mddev->pers->resize)
/* Cannot change size for RAID0 or Linear etc */
return -EINVAL;
}
if (sectors < my_mddev->dev_sectors)
return -EINVAL; /* component must fit device */
rdev->sectors = sectors;
if (sectors > oldsectors && my_mddev->external) {
/* need to check that all other rdevs with the same ->bdev
* do not overlap. We need to unlock the mddev to avoid
* a deadlock. We have already changed rdev->sectors, and if
* we have to change it back, we will have the lock again.
*/
struct mddev *mddev;
int overlap = 0;
struct list_head *tmp;
mddev_unlock(my_mddev);
for_each_mddev(mddev, tmp) {
struct md_rdev *rdev2;
mddev_lock(mddev);
rdev_for_each(rdev2, mddev)
if (rdev->bdev == rdev2->bdev &&
rdev != rdev2 &&
overlaps(rdev->data_offset, rdev->sectors,
rdev2->data_offset,
rdev2->sectors)) {
overlap = 1;
break;
}
mddev_unlock(mddev);
if (overlap) {
mddev_put(mddev);
break;
}
}
mddev_lock(my_mddev);
if (overlap) {
/* Someone else could have slipped in a size
* change here, but doing so is just silly.
* We put oldsectors back because we *know* it is
* safe, and trust userspace not to race with
* itself
*/
rdev->sectors = oldsectors;
return -EBUSY;
}
}
return len;
}
static struct rdev_sysfs_entry rdev_size =
__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
{
unsigned long long recovery_start = rdev->recovery_offset;
if (test_bit(In_sync, &rdev->flags) ||
recovery_start == MaxSector)
return sprintf(page, "none\n");
return sprintf(page, "%llu\n", recovery_start);
}
static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
{
unsigned long long recovery_start;
if (cmd_match(buf, "none"))
recovery_start = MaxSector;
else if (strict_strtoull(buf, 10, &recovery_start))
return -EINVAL;
if (rdev->mddev->pers &&
rdev->raid_disk >= 0)
return -EBUSY;
rdev->recovery_offset = recovery_start;
if (recovery_start == MaxSector)
set_bit(In_sync, &rdev->flags);
else
clear_bit(In_sync, &rdev->flags);
return len;
}
static struct rdev_sysfs_entry rdev_recovery_start =
__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
static ssize_t
badblocks_show(struct badblocks *bb, char *page, int unack);
static ssize_t
badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
static ssize_t bb_show(struct md_rdev *rdev, char *page)
{
return badblocks_show(&rdev->badblocks, page, 0);
}
static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
{
int rv = badblocks_store(&rdev->badblocks, page, len, 0);
/* Maybe that ack was all we needed */
if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
wake_up(&rdev->blocked_wait);
return rv;
}
static struct rdev_sysfs_entry rdev_bad_blocks =
__ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
static ssize_t ubb_show(struct md_rdev *rdev, char *page)
{
return badblocks_show(&rdev->badblocks, page, 1);
}
static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
{
return badblocks_store(&rdev->badblocks, page, len, 1);
}
static struct rdev_sysfs_entry rdev_unack_bad_blocks =
__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
static struct attribute *rdev_default_attrs[] = {
&rdev_state.attr,
&rdev_errors.attr,
&rdev_slot.attr,
&rdev_offset.attr,
&rdev_new_offset.attr,
&rdev_size.attr,
&rdev_recovery_start.attr,
&rdev_bad_blocks.attr,
&rdev_unack_bad_blocks.attr,
NULL,
};
static ssize_t
rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
struct mddev *mddev = rdev->mddev;
ssize_t rv;
if (!entry->show)
return -EIO;
rv = mddev ? mddev_lock(mddev) : -EBUSY;
if (!rv) {
if (rdev->mddev == NULL)
rv = -EBUSY;
else
rv = entry->show(rdev, page);
mddev_unlock(mddev);
}
return rv;
}
static ssize_t
rdev_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t length)
{
struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
ssize_t rv;
struct mddev *mddev = rdev->mddev;
if (!entry->store)
return -EIO;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
rv = mddev ? mddev_lock(mddev): -EBUSY;
if (!rv) {
if (rdev->mddev == NULL)
rv = -EBUSY;
else
rv = entry->store(rdev, page, length);
mddev_unlock(mddev);
}
return rv;
}
static void rdev_free(struct kobject *ko)
{
struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
kfree(rdev);
}
static const struct sysfs_ops rdev_sysfs_ops = {
.show = rdev_attr_show,
.store = rdev_attr_store,
};
static struct kobj_type rdev_ktype = {
.release = rdev_free,
.sysfs_ops = &rdev_sysfs_ops,
.default_attrs = rdev_default_attrs,
};
int md_rdev_init(struct md_rdev *rdev)
{
rdev->desc_nr = -1;
rdev->saved_raid_disk = -1;
rdev->raid_disk = -1;
rdev->flags = 0;
rdev->data_offset = 0;
rdev->new_data_offset = 0;
rdev->sb_events = 0;
rdev->last_read_error.tv_sec = 0;
rdev->last_read_error.tv_nsec = 0;
rdev->sb_loaded = 0;
rdev->bb_page = NULL;
atomic_set(&rdev->nr_pending, 0);
atomic_set(&rdev->read_errors, 0);
atomic_set(&rdev->corrected_errors, 0);
INIT_LIST_HEAD(&rdev->same_set);
init_waitqueue_head(&rdev->blocked_wait);
/* Add space to store bad block list.
* This reserves the space even on arrays where it cannot
* be used - I wonder if that matters
*/
rdev->badblocks.count = 0;
rdev->badblocks.shift = 0;
rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
seqlock_init(&rdev->badblocks.lock);
if (rdev->badblocks.page == NULL)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL_GPL(md_rdev_init);
/*
* Import a device. If 'super_format' >= 0, then sanity check the superblock
*
* mark the device faulty if:
*
* - the device is nonexistent (zero size)
* - the device has no valid superblock
*
* a faulty rdev _never_ has rdev->sb set.
*/
static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
{
char b[BDEVNAME_SIZE];
int err;
struct md_rdev *rdev;
sector_t size;
rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
if (!rdev) {
printk(KERN_ERR "md: could not alloc mem for new device!\n");
return ERR_PTR(-ENOMEM);
}
err = md_rdev_init(rdev);
if (err)
goto abort_free;
err = alloc_disk_sb(rdev);
if (err)
goto abort_free;
err = lock_rdev(rdev, newdev, super_format == -2);
if (err)
goto abort_free;
kobject_init(&rdev->kobj, &rdev_ktype);
size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
if (!size) {
printk(KERN_WARNING
"md: %s has zero or unknown size, marking faulty!\n",
bdevname(rdev->bdev,b));
err = -EINVAL;
goto abort_free;
}
if (super_format >= 0) {
err = super_types[super_format].
load_super(rdev, NULL, super_minor);
if (err == -EINVAL) {
printk(KERN_WARNING
"md: %s does not have a valid v%d.%d "
"superblock, not importing!\n",
bdevname(rdev->bdev,b),
super_format, super_minor);
goto abort_free;
}
if (err < 0) {
printk(KERN_WARNING
"md: could not read %s's sb, not importing!\n",
bdevname(rdev->bdev,b));
goto abort_free;
}
}
if (super_format == -1)
/* hot-add for 0.90, or non-persistent: so no badblocks */
rdev->badblocks.shift = -1;
return rdev;
abort_free:
if (rdev->bdev)
unlock_rdev(rdev);
md_rdev_clear(rdev);
kfree(rdev);
return ERR_PTR(err);
}
/*
* Check a full RAID array for plausibility
*/
static void analyze_sbs(struct mddev * mddev)
{
int i;
struct md_rdev *rdev, *freshest, *tmp;
char b[BDEVNAME_SIZE];
freshest = NULL;
rdev_for_each_safe(rdev, tmp, mddev)
switch (super_types[mddev->major_version].
load_super(rdev, freshest, mddev->minor_version)) {
case 1:
freshest = rdev;
break;
case 0:
break;
default:
printk( KERN_ERR \
"md: fatal superblock inconsistency in %s"
" -- removing from array\n",
bdevname(rdev->bdev,b));
kick_rdev_from_array(rdev);
}
super_types[mddev->major_version].
validate_super(mddev, freshest);
i = 0;
rdev_for_each_safe(rdev, tmp, mddev) {
if (mddev->max_disks &&
(rdev->desc_nr >= mddev->max_disks ||
i > mddev->max_disks)) {
printk(KERN_WARNING
"md: %s: %s: only %d devices permitted\n",
mdname(mddev), bdevname(rdev->bdev, b),
mddev->max_disks);
kick_rdev_from_array(rdev);
continue;
}
if (rdev != freshest)
if (super_types[mddev->major_version].
validate_super(mddev, rdev)) {
printk(KERN_WARNING "md: kicking non-fresh %s"
" from array!\n",
bdevname(rdev->bdev,b));
kick_rdev_from_array(rdev);
continue;
}
if (mddev->level == LEVEL_MULTIPATH) {
rdev->desc_nr = i++;
rdev->raid_disk = rdev->desc_nr;
set_bit(In_sync, &rdev->flags);
} else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
rdev->raid_disk = -1;
clear_bit(In_sync, &rdev->flags);
}
}
}
/* Read a fixed-point number.
* Numbers in sysfs attributes should be in "standard" units where
* possible, so time should be in seconds.
* However we internally use a a much smaller unit such as
* milliseconds or jiffies.
* This function takes a decimal number with a possible fractional
* component, and produces an integer which is the result of
* multiplying that number by 10^'scale'.
* all without any floating-point arithmetic.
*/
int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
{
unsigned long result = 0;
long decimals = -1;
while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
if (*cp == '.')
decimals = 0;
else if (decimals < scale) {
unsigned int value;
value = *cp - '0';
result = result * 10 + value;
if (decimals >= 0)
decimals++;
}
cp++;
}
if (*cp == '\n')
cp++;
if (*cp)
return -EINVAL;
if (decimals < 0)
decimals = 0;
while (decimals < scale) {
result *= 10;
decimals ++;
}
*res = result;
return 0;
}
static void md_safemode_timeout(unsigned long data);
static ssize_t
safe_delay_show(struct mddev *mddev, char *page)
{
int msec = (mddev->safemode_delay*1000)/HZ;
return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
}
static ssize_t
safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
{
unsigned long msec;
if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
return -EINVAL;
if (msec == 0)
mddev->safemode_delay = 0;
else {
unsigned long old_delay = mddev->safemode_delay;
mddev->safemode_delay = (msec*HZ)/1000;
if (mddev->safemode_delay == 0)
mddev->safemode_delay = 1;
if (mddev->safemode_delay < old_delay)
md_safemode_timeout((unsigned long)mddev);
}
return len;
}
static struct md_sysfs_entry md_safe_delay =
__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
static ssize_t
level_show(struct mddev *mddev, char *page)
{
struct md_personality *p = mddev->pers;
if (p)
return sprintf(page, "%s\n", p->name);
else if (mddev->clevel[0])
return sprintf(page, "%s\n", mddev->clevel);
else if (mddev->level != LEVEL_NONE)
return sprintf(page, "%d\n", mddev->level);
else
return 0;
}
static ssize_t
level_store(struct mddev *mddev, const char *buf, size_t len)
{
char clevel[16];
ssize_t rv = len;
struct md_personality *pers;
long level;
void *priv;
struct md_rdev *rdev;
if (mddev->pers == NULL) {
if (len == 0)
return 0;
if (len >= sizeof(mddev->clevel))
return -ENOSPC;
strncpy(mddev->clevel, buf, len);
if (mddev->clevel[len-1] == '\n')
len--;
mddev->clevel[len] = 0;
mddev->level = LEVEL_NONE;
return rv;
}
/* request to change the personality. Need to ensure:
* - array is not engaged in resync/recovery/reshape
* - old personality can be suspended
* - new personality will access other array.
*/
if (mddev->sync_thread ||
mddev->reshape_position != MaxSector ||
mddev->sysfs_active)
return -EBUSY;
if (!mddev->pers->quiesce) {
printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
mdname(mddev), mddev->pers->name);
return -EINVAL;
}
/* Now find the new personality */
if (len == 0 || len >= sizeof(clevel))
return -EINVAL;
strncpy(clevel, buf, len);
if (clevel[len-1] == '\n')
len--;
clevel[len] = 0;
if (strict_strtol(clevel, 10, &level))
level = LEVEL_NONE;
if (request_module("md-%s", clevel) != 0)
request_module("md-level-%s", clevel);
spin_lock(&pers_lock);
pers = find_pers(level, clevel);
if (!pers || !try_module_get(pers->owner)) {
spin_unlock(&pers_lock);
printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
return -EINVAL;
}
spin_unlock(&pers_lock);
if (pers == mddev->pers) {
/* Nothing to do! */
module_put(pers->owner);
return rv;
}
if (!pers->takeover) {
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
mdname(mddev), clevel);
return -EINVAL;
}
rdev_for_each(rdev, mddev)
rdev->new_raid_disk = rdev->raid_disk;
/* ->takeover must set new_* and/or delta_disks
* if it succeeds, and may set them when it fails.
*/
priv = pers->takeover(mddev);
if (IS_ERR(priv)) {
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->raid_disks -= mddev->delta_disks;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
module_put(pers->owner);
printk(KERN_WARNING "md: %s: %s would not accept array\n",
mdname(mddev), clevel);
return PTR_ERR(priv);
}
/* Looks like we have a winner */
mddev_suspend(mddev);
mddev->pers->stop(mddev);
if (mddev->pers->sync_request == NULL &&
pers->sync_request != NULL) {
/* need to add the md_redundancy_group */
if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
printk(KERN_WARNING
"md: cannot register extra attributes for %s\n",
mdname(mddev));
mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
}
if (mddev->pers->sync_request != NULL &&
pers->sync_request == NULL) {
/* need to remove the md_redundancy_group */
if (mddev->to_remove == NULL)
mddev->to_remove = &md_redundancy_group;
}
if (mddev->pers->sync_request == NULL &&
mddev->external) {
/* We are converting from a no-redundancy array
* to a redundancy array and metadata is managed
* externally so we need to be sure that writes
* won't block due to a need to transition
* clean->dirty
* until external management is started.
*/
mddev->in_sync = 0;
mddev->safemode_delay = 0;
mddev->safemode = 0;
}
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk < 0)
continue;
if (rdev->new_raid_disk >= mddev->raid_disks)
rdev->new_raid_disk = -1;
if (rdev->new_raid_disk == rdev->raid_disk)
continue;
sysfs_unlink_rdev(mddev, rdev);
}
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk < 0)
continue;
if (rdev->new_raid_disk == rdev->raid_disk)
continue;
rdev->raid_disk = rdev->new_raid_disk;
if (rdev->raid_disk < 0)
clear_bit(In_sync, &rdev->flags);
else {
if (sysfs_link_rdev(mddev, rdev))
printk(KERN_WARNING "md: cannot register rd%d"
" for %s after level change\n",
rdev->raid_disk, mdname(mddev));
}
}
module_put(mddev->pers->owner);
mddev->pers = pers;
mddev->private = priv;
strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
mddev->level = mddev->new_level;
mddev->layout = mddev->new_layout;
mddev->chunk_sectors = mddev->new_chunk_sectors;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
mddev->degraded = 0;
if (mddev->pers->sync_request == NULL) {
/* this is now an array without redundancy, so
* it must always be in_sync
*/
mddev->in_sync = 1;
del_timer_sync(&mddev->safemode_timer);
}
pers->run(mddev);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
mddev_resume(mddev);
sysfs_notify(&mddev->kobj, NULL, "level");
md_new_event(mddev);
return rv;
}
static struct md_sysfs_entry md_level =
__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
static ssize_t
layout_show(struct mddev *mddev, char *page)
{
/* just a number, not meaningful for all levels */
if (mddev->reshape_position != MaxSector &&
mddev->layout != mddev->new_layout)
return sprintf(page, "%d (%d)\n",
mddev->new_layout, mddev->layout);
return sprintf(page, "%d\n", mddev->layout);
}
static ssize_t
layout_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
if (mddev->pers) {
int err;
if (mddev->pers->check_reshape == NULL)
return -EBUSY;
mddev->new_layout = n;
err = mddev->pers->check_reshape(mddev);
if (err) {
mddev->new_layout = mddev->layout;
return err;
}
} else {
mddev->new_layout = n;
if (mddev->reshape_position == MaxSector)
mddev->layout = n;
}
return len;
}
static struct md_sysfs_entry md_layout =
__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
static ssize_t
raid_disks_show(struct mddev *mddev, char *page)
{
if (mddev->raid_disks == 0)
return 0;
if (mddev->reshape_position != MaxSector &&
mddev->delta_disks != 0)
return sprintf(page, "%d (%d)\n", mddev->raid_disks,
mddev->raid_disks - mddev->delta_disks);
return sprintf(page, "%d\n", mddev->raid_disks);
}
static int update_raid_disks(struct mddev *mddev, int raid_disks);
static ssize_t
raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
int rv = 0;
unsigned long n = simple_strtoul(buf, &e, 10);
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
if (mddev->pers)
rv = update_raid_disks(mddev, n);
else if (mddev->reshape_position != MaxSector) {
struct md_rdev *rdev;
int olddisks = mddev->raid_disks - mddev->delta_disks;
rdev_for_each(rdev, mddev) {
if (olddisks < n &&
rdev->data_offset < rdev->new_data_offset)
return -EINVAL;
if (olddisks > n &&
rdev->data_offset > rdev->new_data_offset)
return -EINVAL;
}
mddev->delta_disks = n - olddisks;
mddev->raid_disks = n;
mddev->reshape_backwards = (mddev->delta_disks < 0);
} else
mddev->raid_disks = n;
return rv ? rv : len;
}
static struct md_sysfs_entry md_raid_disks =
__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
static ssize_t
chunk_size_show(struct mddev *mddev, char *page)
{
if (mddev->reshape_position != MaxSector &&
mddev->chunk_sectors != mddev->new_chunk_sectors)
return sprintf(page, "%d (%d)\n",
mddev->new_chunk_sectors << 9,
mddev->chunk_sectors << 9);
return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
}
static ssize_t
chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
if (mddev->pers) {
int err;
if (mddev->pers->check_reshape == NULL)
return -EBUSY;
mddev->new_chunk_sectors = n >> 9;
err = mddev->pers->check_reshape(mddev);
if (err) {
mddev->new_chunk_sectors = mddev->chunk_sectors;
return err;
}
} else {
mddev->new_chunk_sectors = n >> 9;
if (mddev->reshape_position == MaxSector)
mddev->chunk_sectors = n >> 9;
}
return len;
}
static struct md_sysfs_entry md_chunk_size =
__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
static ssize_t
resync_start_show(struct mddev *mddev, char *page)
{
if (mddev->recovery_cp == MaxSector)
return sprintf(page, "none\n");
return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
}
static ssize_t
resync_start_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long long n = simple_strtoull(buf, &e, 10);
if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
return -EBUSY;
if (cmd_match(buf, "none"))
n = MaxSector;
else if (!*buf || (*e && *e != '\n'))
return -EINVAL;
mddev->recovery_cp = n;
if (mddev->pers)
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
return len;
}
static struct md_sysfs_entry md_resync_start =
__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
/*
* The array state can be:
*
* clear
* No devices, no size, no level
* Equivalent to STOP_ARRAY ioctl
* inactive
* May have some settings, but array is not active
* all IO results in error
* When written, doesn't tear down array, but just stops it
* suspended (not supported yet)
* All IO requests will block. The array can be reconfigured.
* Writing this, if accepted, will block until array is quiescent
* readonly
* no resync can happen. no superblocks get written.
* write requests fail
* read-auto
* like readonly, but behaves like 'clean' on a write request.
*
* clean - no pending writes, but otherwise active.
* When written to inactive array, starts without resync
* If a write request arrives then
* if metadata is known, mark 'dirty' and switch to 'active'.
* if not known, block and switch to write-pending
* If written to an active array that has pending writes, then fails.
* active
* fully active: IO and resync can be happening.
* When written to inactive array, starts with resync
*
* write-pending
* clean, but writes are blocked waiting for 'active' to be written.
*
* active-idle
* like active, but no writes have been seen for a while (100msec).
*
*/
enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
write_pending, active_idle, bad_word};
static char *array_states[] = {
"clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
"write-pending", "active-idle", NULL };
static int match_word(const char *word, char **list)
{
int n;
for (n=0; list[n]; n++)
if (cmd_match(word, list[n]))
break;
return n;
}
static ssize_t
array_state_show(struct mddev *mddev, char *page)
{
enum array_state st = inactive;
if (mddev->pers)
switch(mddev->ro) {
case 1:
st = readonly;
break;
case 2:
st = read_auto;
break;
case 0:
if (mddev->in_sync)
st = clean;
else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
st = write_pending;
else if (mddev->safemode)
st = active_idle;
else
st = active;
}
else {
if (list_empty(&mddev->disks) &&
mddev->raid_disks == 0 &&
mddev->dev_sectors == 0)
st = clear;
else
st = inactive;
}
return sprintf(page, "%s\n", array_states[st]);
}
static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev);
static int md_set_readonly(struct mddev * mddev, struct block_device *bdev);
static int do_md_run(struct mddev * mddev);
static int restart_array(struct mddev *mddev);
static ssize_t
array_state_store(struct mddev *mddev, const char *buf, size_t len)
{
int err = -EINVAL;
enum array_state st = match_word(buf, array_states);
switch(st) {
case bad_word:
break;
case clear:
/* stopping an active array */
err = do_md_stop(mddev, 0, NULL);
break;
case inactive:
/* stopping an active array */
if (mddev->pers)
err = do_md_stop(mddev, 2, NULL);
else
err = 0; /* already inactive */
break;
case suspended:
break; /* not supported yet */
case readonly:
if (mddev->pers)
err = md_set_readonly(mddev, NULL);
else {
mddev->ro = 1;
set_disk_ro(mddev->gendisk, 1);
err = do_md_run(mddev);
}
break;
case read_auto:
if (mddev->pers) {
if (mddev->ro == 0)
err = md_set_readonly(mddev, NULL);
else if (mddev->ro == 1)
err = restart_array(mddev);
if (err == 0) {
mddev->ro = 2;
set_disk_ro(mddev->gendisk, 0);
}
} else {
mddev->ro = 2;
err = do_md_run(mddev);
}
break;
case clean:
if (mddev->pers) {
restart_array(mddev);
spin_lock_irq(&mddev->write_lock);
if (atomic_read(&mddev->writes_pending) == 0) {
if (mddev->in_sync == 0) {
mddev->in_sync = 1;
if (mddev->safemode == 1)
mddev->safemode = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
}
err = 0;
} else
err = -EBUSY;
spin_unlock_irq(&mddev->write_lock);
} else
err = -EINVAL;
break;
case active:
if (mddev->pers) {
restart_array(mddev);
clear_bit(MD_CHANGE_PENDING, &mddev->flags);
wake_up(&mddev->sb_wait);
err = 0;
} else {
mddev->ro = 0;
set_disk_ro(mddev->gendisk, 0);
err = do_md_run(mddev);
}
break;
case write_pending:
case active_idle:
/* these cannot be set */
break;
}
if (err)
return err;
else {
if (mddev->hold_active == UNTIL_IOCTL)
mddev->hold_active = 0;
sysfs_notify_dirent_safe(mddev->sysfs_state);
return len;
}
}
static struct md_sysfs_entry md_array_state =
__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
static ssize_t
max_corrected_read_errors_show(struct mddev *mddev, char *page) {
return sprintf(page, "%d\n",
atomic_read(&mddev->max_corr_read_errors));
}
static ssize_t
max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
if (*buf && (*e == 0 || *e == '\n')) {
atomic_set(&mddev->max_corr_read_errors, n);
return len;
}
return -EINVAL;
}
static struct md_sysfs_entry max_corr_read_errors =
__ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
max_corrected_read_errors_store);
static ssize_t
null_show(struct mddev *mddev, char *page)
{
return -EINVAL;
}
static ssize_t
new_dev_store(struct mddev *mddev, const char *buf, size_t len)
{
/* buf must be %d:%d\n? giving major and minor numbers */
/* The new device is added to the array.
* If the array has a persistent superblock, we read the
* superblock to initialise info and check validity.
* Otherwise, only checking done is that in bind_rdev_to_array,
* which mainly checks size.
*/
char *e;
int major = simple_strtoul(buf, &e, 10);
int minor;
dev_t dev;
struct md_rdev *rdev;
int err;
if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
return -EINVAL;
minor = simple_strtoul(e+1, &e, 10);
if (*e && *e != '\n')
return -EINVAL;
dev = MKDEV(major, minor);
if (major != MAJOR(dev) ||
minor != MINOR(dev))
return -EOVERFLOW;
if (mddev->persistent) {
rdev = md_import_device(dev, mddev->major_version,
mddev->minor_version);
if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
struct md_rdev *rdev0
= list_entry(mddev->disks.next,
struct md_rdev, same_set);
err = super_types[mddev->major_version]
.load_super(rdev, rdev0, mddev->minor_version);
if (err < 0)
goto out;
}
} else if (mddev->external)
rdev = md_import_device(dev, -2, -1);
else
rdev = md_import_device(dev, -1, -1);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
err = bind_rdev_to_array(rdev, mddev);
out:
if (err)
export_rdev(rdev);
return err ? err : len;
}
static struct md_sysfs_entry md_new_device =
__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
static ssize_t
bitmap_store(struct mddev *mddev, const char *buf, size_t len)
{
char *end;
unsigned long chunk, end_chunk;
if (!mddev->bitmap)
goto out;
/* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
while (*buf) {
chunk = end_chunk = simple_strtoul(buf, &end, 0);
if (buf == end) break;
if (*end == '-') { /* range */
buf = end + 1;
end_chunk = simple_strtoul(buf, &end, 0);
if (buf == end) break;
}
if (*end && !isspace(*end)) break;
bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
buf = skip_spaces(end);
}
bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
out:
return len;
}
static struct md_sysfs_entry md_bitmap =
__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
static ssize_t
size_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long)mddev->dev_sectors / 2);
}
static int update_size(struct mddev *mddev, sector_t num_sectors);
static ssize_t
size_store(struct mddev *mddev, const char *buf, size_t len)
{
/* If array is inactive, we can reduce the component size, but
* not increase it (except from 0).
* If array is active, we can try an on-line resize
*/
sector_t sectors;
int err = strict_blocks_to_sectors(buf, &sectors);
if (err < 0)
return err;
if (mddev->pers) {
err = update_size(mddev, sectors);
md_update_sb(mddev, 1);
} else {
if (mddev->dev_sectors == 0 ||
mddev->dev_sectors > sectors)
mddev->dev_sectors = sectors;
else
err = -ENOSPC;
}
return err ? err : len;
}
static struct md_sysfs_entry md_size =
__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
/* Metadata version.
* This is one of
* 'none' for arrays with no metadata (good luck...)
* 'external' for arrays with externally managed metadata,
* or N.M for internally known formats
*/
static ssize_t
metadata_show(struct mddev *mddev, char *page)
{
if (mddev->persistent)
return sprintf(page, "%d.%d\n",
mddev->major_version, mddev->minor_version);
else if (mddev->external)
return sprintf(page, "external:%s\n", mddev->metadata_type);
else
return sprintf(page, "none\n");
}
static ssize_t
metadata_store(struct mddev *mddev, const char *buf, size_t len)
{
int major, minor;
char *e;
/* Changing the details of 'external' metadata is
* always permitted. Otherwise there must be
* no devices attached to the array.
*/
if (mddev->external && strncmp(buf, "external:", 9) == 0)
;
else if (!list_empty(&mddev->disks))
return -EBUSY;
if (cmd_match(buf, "none")) {
mddev->persistent = 0;
mddev->external = 0;
mddev->major_version = 0;
mddev->minor_version = 90;
return len;
}
if (strncmp(buf, "external:", 9) == 0) {
size_t namelen = len-9;
if (namelen >= sizeof(mddev->metadata_type))
namelen = sizeof(mddev->metadata_type)-1;
strncpy(mddev->metadata_type, buf+9, namelen);
mddev->metadata_type[namelen] = 0;
if (namelen && mddev->metadata_type[namelen-1] == '\n')
mddev->metadata_type[--namelen] = 0;
mddev->persistent = 0;
mddev->external = 1;
mddev->major_version = 0;
mddev->minor_version = 90;
return len;
}
major = simple_strtoul(buf, &e, 10);
if (e==buf || *e != '.')
return -EINVAL;
buf = e+1;
minor = simple_strtoul(buf, &e, 10);
if (e==buf || (*e && *e != '\n') )
return -EINVAL;
if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
return -ENOENT;
mddev->major_version = major;
mddev->minor_version = minor;
mddev->persistent = 1;
mddev->external = 0;
return len;
}
static struct md_sysfs_entry md_metadata =
__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
static ssize_t
action_show(struct mddev *mddev, char *page)
{
char *type = "idle";
if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
type = "frozen";
else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
(!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
type = "reshape";
else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
type = "resync";
else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
type = "check";
else
type = "repair";
} else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
type = "recover";
}
return sprintf(page, "%s\n", type);
}
static void reap_sync_thread(struct mddev *mddev);
static ssize_t
action_store(struct mddev *mddev, const char *page, size_t len)
{
if (!mddev->pers || !mddev->pers->sync_request)
return -EINVAL;
if (cmd_match(page, "frozen"))
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
else
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
reap_sync_thread(mddev);
}
} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
return -EBUSY;
else if (cmd_match(page, "resync"))
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
else if (cmd_match(page, "recover")) {
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
} else if (cmd_match(page, "reshape")) {
int err;
if (mddev->pers->start_reshape == NULL)
return -EINVAL;
err = mddev->pers->start_reshape(mddev);
if (err)
return err;
sysfs_notify(&mddev->kobj, NULL, "degraded");
} else {
if (cmd_match(page, "check"))
set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
else if (!cmd_match(page, "repair"))
return -EINVAL;
set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
}
if (mddev->ro == 2) {
/* A write to sync_action is enough to justify
* canceling read-auto mode
*/
mddev->ro = 0;
md_wakeup_thread(mddev->sync_thread);
}
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
sysfs_notify_dirent_safe(mddev->sysfs_action);
return len;
}
static ssize_t
mismatch_cnt_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long)
atomic64_read(&mddev->resync_mismatches));
}
static struct md_sysfs_entry md_scan_mode =
__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
static ssize_t
sync_min_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d (%s)\n", speed_min(mddev),
mddev->sync_speed_min ? "local": "system");
}
static ssize_t
sync_min_store(struct mddev *mddev, const char *buf, size_t len)
{
int min;
char *e;
if (strncmp(buf, "system", 6)==0) {
mddev->sync_speed_min = 0;
return len;
}
min = simple_strtoul(buf, &e, 10);
if (buf == e || (*e && *e != '\n') || min <= 0)
return -EINVAL;
mddev->sync_speed_min = min;
return len;
}
static struct md_sysfs_entry md_sync_min =
__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
static ssize_t
sync_max_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d (%s)\n", speed_max(mddev),
mddev->sync_speed_max ? "local": "system");
}
static ssize_t
sync_max_store(struct mddev *mddev, const char *buf, size_t len)
{
int max;
char *e;
if (strncmp(buf, "system", 6)==0) {
mddev->sync_speed_max = 0;
return len;
}
max = simple_strtoul(buf, &e, 10);
if (buf == e || (*e && *e != '\n') || max <= 0)
return -EINVAL;
mddev->sync_speed_max = max;
return len;
}
static struct md_sysfs_entry md_sync_max =
__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
static ssize_t
degraded_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d\n", mddev->degraded);
}
static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
static ssize_t
sync_force_parallel_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%d\n", mddev->parallel_resync);
}
static ssize_t
sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
{
long n;
if (strict_strtol(buf, 10, &n))
return -EINVAL;
if (n != 0 && n != 1)
return -EINVAL;
mddev->parallel_resync = n;
if (mddev->sync_thread)
wake_up(&resync_wait);
return len;
}
/* force parallel resync, even with shared block devices */
static struct md_sysfs_entry md_sync_force_parallel =
__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
sync_force_parallel_show, sync_force_parallel_store);
static ssize_t
sync_speed_show(struct mddev *mddev, char *page)
{
unsigned long resync, dt, db;
if (mddev->curr_resync == 0)
return sprintf(page, "none\n");
resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
dt = (jiffies - mddev->resync_mark) / HZ;
if (!dt) dt++;
db = resync - mddev->resync_mark_cnt;
return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
}
static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
static ssize_t
sync_completed_show(struct mddev *mddev, char *page)
{
unsigned long long max_sectors, resync;
if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return sprintf(page, "none\n");
if (mddev->curr_resync == 1 ||
mddev->curr_resync == 2)
return sprintf(page, "delayed\n");
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
max_sectors = mddev->resync_max_sectors;
else
max_sectors = mddev->dev_sectors;
resync = mddev->curr_resync_completed;
return sprintf(page, "%llu / %llu\n", resync, max_sectors);
}
static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
static ssize_t
min_sync_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n",
(unsigned long long)mddev->resync_min);
}
static ssize_t
min_sync_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long long min;
if (strict_strtoull(buf, 10, &min))
return -EINVAL;
if (min > mddev->resync_max)
return -EINVAL;
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
/* Must be a multiple of chunk_size */
if (mddev->chunk_sectors) {
sector_t temp = min;
if (sector_div(temp, mddev->chunk_sectors))
return -EINVAL;
}
mddev->resync_min = min;
return len;
}
static struct md_sysfs_entry md_min_sync =
__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
static ssize_t
max_sync_show(struct mddev *mddev, char *page)
{
if (mddev->resync_max == MaxSector)
return sprintf(page, "max\n");
else
return sprintf(page, "%llu\n",
(unsigned long long)mddev->resync_max);
}
static ssize_t
max_sync_store(struct mddev *mddev, const char *buf, size_t len)
{
if (strncmp(buf, "max", 3) == 0)
mddev->resync_max = MaxSector;
else {
unsigned long long max;
if (strict_strtoull(buf, 10, &max))
return -EINVAL;
if (max < mddev->resync_min)
return -EINVAL;
if (max < mddev->resync_max &&
mddev->ro == 0 &&
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
/* Must be a multiple of chunk_size */
if (mddev->chunk_sectors) {
sector_t temp = max;
if (sector_div(temp, mddev->chunk_sectors))
return -EINVAL;
}
mddev->resync_max = max;
}
wake_up(&mddev->recovery_wait);
return len;
}
static struct md_sysfs_entry md_max_sync =
__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
static ssize_t
suspend_lo_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
}
static ssize_t
suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
unsigned long long old = mddev->suspend_lo;
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
return -EINVAL;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
mddev->suspend_lo = new;
if (new >= old)
/* Shrinking suspended region */
mddev->pers->quiesce(mddev, 2);
else {
/* Expanding suspended region - need to wait */
mddev->pers->quiesce(mddev, 1);
mddev->pers->quiesce(mddev, 0);
}
return len;
}
static struct md_sysfs_entry md_suspend_lo =
__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
static ssize_t
suspend_hi_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
}
static ssize_t
suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
{
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
unsigned long long old = mddev->suspend_hi;
if (mddev->pers == NULL ||
mddev->pers->quiesce == NULL)
return -EINVAL;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
mddev->suspend_hi = new;
if (new <= old)
/* Shrinking suspended region */
mddev->pers->quiesce(mddev, 2);
else {
/* Expanding suspended region - need to wait */
mddev->pers->quiesce(mddev, 1);
mddev->pers->quiesce(mddev, 0);
}
return len;
}
static struct md_sysfs_entry md_suspend_hi =
__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
static ssize_t
reshape_position_show(struct mddev *mddev, char *page)
{
if (mddev->reshape_position != MaxSector)
return sprintf(page, "%llu\n",
(unsigned long long)mddev->reshape_position);
strcpy(page, "none\n");
return 5;
}
static ssize_t
reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
{
struct md_rdev *rdev;
char *e;
unsigned long long new = simple_strtoull(buf, &e, 10);
if (mddev->pers)
return -EBUSY;
if (buf == e || (*e && *e != '\n'))
return -EINVAL;
mddev->reshape_position = new;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
mddev->new_level = mddev->level;
mddev->new_layout = mddev->layout;
mddev->new_chunk_sectors = mddev->chunk_sectors;
rdev_for_each(rdev, mddev)
rdev->new_data_offset = rdev->data_offset;
return len;
}
static struct md_sysfs_entry md_reshape_position =
__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
reshape_position_store);
static ssize_t
reshape_direction_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%s\n",
mddev->reshape_backwards ? "backwards" : "forwards");
}
static ssize_t
reshape_direction_store(struct mddev *mddev, const char *buf, size_t len)
{
int backwards = 0;
if (cmd_match(buf, "forwards"))
backwards = 0;
else if (cmd_match(buf, "backwards"))
backwards = 1;
else
return -EINVAL;
if (mddev->reshape_backwards == backwards)
return len;
/* check if we are allowed to change */
if (mddev->delta_disks)
return -EBUSY;
if (mddev->persistent &&
mddev->major_version == 0)
return -EINVAL;
mddev->reshape_backwards = backwards;
return len;
}
static struct md_sysfs_entry md_reshape_direction =
__ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show,
reshape_direction_store);
static ssize_t
array_size_show(struct mddev *mddev, char *page)
{
if (mddev->external_size)
return sprintf(page, "%llu\n",
(unsigned long long)mddev->array_sectors/2);
else
return sprintf(page, "default\n");
}
static ssize_t
array_size_store(struct mddev *mddev, const char *buf, size_t len)
{
sector_t sectors;
if (strncmp(buf, "default", 7) == 0) {
if (mddev->pers)
sectors = mddev->pers->size(mddev, 0, 0);
else
sectors = mddev->array_sectors;
mddev->external_size = 0;
} else {
if (strict_blocks_to_sectors(buf, &sectors) < 0)
return -EINVAL;
if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
return -E2BIG;
mddev->external_size = 1;
}
mddev->array_sectors = sectors;
if (mddev->pers) {
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
}
return len;
}
static struct md_sysfs_entry md_array_size =
__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
array_size_store);
static struct attribute *md_default_attrs[] = {
&md_level.attr,
&md_layout.attr,
&md_raid_disks.attr,
&md_chunk_size.attr,
&md_size.attr,
&md_resync_start.attr,
&md_metadata.attr,
&md_new_device.attr,
&md_safe_delay.attr,
&md_array_state.attr,
&md_reshape_position.attr,
&md_reshape_direction.attr,
&md_array_size.attr,
&max_corr_read_errors.attr,
NULL,
};
static struct attribute *md_redundancy_attrs[] = {
&md_scan_mode.attr,
&md_mismatches.attr,
&md_sync_min.attr,
&md_sync_max.attr,
&md_sync_speed.attr,
&md_sync_force_parallel.attr,
&md_sync_completed.attr,
&md_min_sync.attr,
&md_max_sync.attr,
&md_suspend_lo.attr,
&md_suspend_hi.attr,
&md_bitmap.attr,
&md_degraded.attr,
NULL,
};
static struct attribute_group md_redundancy_group = {
.name = NULL,
.attrs = md_redundancy_attrs,
};
static ssize_t
md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
struct mddev *mddev = container_of(kobj, struct mddev, kobj);
ssize_t rv;
if (!entry->show)
return -EIO;
spin_lock(&all_mddevs_lock);
if (list_empty(&mddev->all_mddevs)) {
spin_unlock(&all_mddevs_lock);
return -EBUSY;
}
mddev_get(mddev);
spin_unlock(&all_mddevs_lock);
rv = mddev_lock(mddev);
if (!rv) {
rv = entry->show(mddev, page);
mddev_unlock(mddev);
}
mddev_put(mddev);
return rv;
}
static ssize_t
md_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t length)
{
struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
struct mddev *mddev = container_of(kobj, struct mddev, kobj);
ssize_t rv;
if (!entry->store)
return -EIO;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
spin_lock(&all_mddevs_lock);
if (list_empty(&mddev->all_mddevs)) {
spin_unlock(&all_mddevs_lock);
return -EBUSY;
}
mddev_get(mddev);
spin_unlock(&all_mddevs_lock);
if (entry->store == new_dev_store)
flush_workqueue(md_misc_wq);
rv = mddev_lock(mddev);
if (!rv) {
rv = entry->store(mddev, page, length);
mddev_unlock(mddev);
}
mddev_put(mddev);
return rv;
}
static void md_free(struct kobject *ko)
{
struct mddev *mddev = container_of(ko, struct mddev, kobj);
if (mddev->sysfs_state)
sysfs_put(mddev->sysfs_state);
if (mddev->gendisk) {
del_gendisk(mddev->gendisk);
put_disk(mddev->gendisk);
}
if (mddev->queue)
blk_cleanup_queue(mddev->queue);
kfree(mddev);
}
static const struct sysfs_ops md_sysfs_ops = {
.show = md_attr_show,
.store = md_attr_store,
};
static struct kobj_type md_ktype = {
.release = md_free,
.sysfs_ops = &md_sysfs_ops,
.default_attrs = md_default_attrs,
};
int mdp_major = 0;
static void mddev_delayed_delete(struct work_struct *ws)
{
struct mddev *mddev = container_of(ws, struct mddev, del_work);
sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
kobject_del(&mddev->kobj);
kobject_put(&mddev->kobj);
}
static int md_alloc(dev_t dev, char *name)
{
static DEFINE_MUTEX(disks_mutex);
struct mddev *mddev = mddev_find(dev);
struct gendisk *disk;
int partitioned;
int shift;
int unit;
int error;
if (!mddev)
return -ENODEV;
partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
shift = partitioned ? MdpMinorShift : 0;
unit = MINOR(mddev->unit) >> shift;
/* wait for any previous instance of this device to be
* completely removed (mddev_delayed_delete).
*/
flush_workqueue(md_misc_wq);
mutex_lock(&disks_mutex);
error = -EEXIST;
if (mddev->gendisk)
goto abort;
if (name) {
/* Need to ensure that 'name' is not a duplicate.
*/
struct mddev *mddev2;
spin_lock(&all_mddevs_lock);
list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
if (mddev2->gendisk &&
strcmp(mddev2->gendisk->disk_name, name) == 0) {
spin_unlock(&all_mddevs_lock);
goto abort;
}
spin_unlock(&all_mddevs_lock);
}
error = -ENOMEM;
mddev->queue = blk_alloc_queue(GFP_KERNEL);
if (!mddev->queue)
goto abort;
mddev->queue->queuedata = mddev;
blk_queue_make_request(mddev->queue, md_make_request);
blk_set_stacking_limits(&mddev->queue->limits);
disk = alloc_disk(1 << shift);
if (!disk) {
blk_cleanup_queue(mddev->queue);
mddev->queue = NULL;
goto abort;
}
disk->major = MAJOR(mddev->unit);
disk->first_minor = unit << shift;
if (name)
strcpy(disk->disk_name, name);
else if (partitioned)
sprintf(disk->disk_name, "md_d%d", unit);
else
sprintf(disk->disk_name, "md%d", unit);
disk->fops = &md_fops;
disk->private_data = mddev;
disk->queue = mddev->queue;
blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
/* Allow extended partitions. This makes the
* 'mdp' device redundant, but we can't really
* remove it now.
*/
disk->flags |= GENHD_FL_EXT_DEVT;
mddev->gendisk = disk;
/* As soon as we call add_disk(), another thread could get
* through to md_open, so make sure it doesn't get too far
*/
mutex_lock(&mddev->open_mutex);
add_disk(disk);
error = kobject_init_and_add(&mddev->kobj, &md_ktype,
&disk_to_dev(disk)->kobj, "%s", "md");
if (error) {
/* This isn't possible, but as kobject_init_and_add is marked
* __must_check, we must do something with the result
*/
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
disk->disk_name);
error = 0;
}
if (mddev->kobj.sd &&
sysfs_create_group(&mddev->kobj, &md_bitmap_group))
printk(KERN_DEBUG "pointless warning\n");
mutex_unlock(&mddev->open_mutex);
abort:
mutex_unlock(&disks_mutex);
if (!error && mddev->kobj.sd) {
kobject_uevent(&mddev->kobj, KOBJ_ADD);
mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
}
mddev_put(mddev);
return error;
}
static struct kobject *md_probe(dev_t dev, int *part, void *data)
{
md_alloc(dev, NULL);
return NULL;
}
static int add_named_array(const char *val, struct kernel_param *kp)
{
/* val must be "md_*" where * is not all digits.
* We allocate an array with a large free minor number, and
* set the name to val. val must not already be an active name.
*/
int len = strlen(val);
char buf[DISK_NAME_LEN];
while (len && val[len-1] == '\n')
len--;
if (len >= DISK_NAME_LEN)
return -E2BIG;
strlcpy(buf, val, len+1);
if (strncmp(buf, "md_", 3) != 0)
return -EINVAL;
return md_alloc(0, buf);
}
static void md_safemode_timeout(unsigned long data)
{
struct mddev *mddev = (struct mddev *) data;
if (!atomic_read(&mddev->writes_pending)) {
mddev->safemode = 1;
if (mddev->external)
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
md_wakeup_thread(mddev->thread);
}
static int start_dirty_degraded;
int md_run(struct mddev *mddev)
{
int err;
struct md_rdev *rdev;
struct md_personality *pers;
if (list_empty(&mddev->disks))
/* cannot run an array with no devices.. */
return -EINVAL;
if (mddev->pers)
return -EBUSY;
/* Cannot run until previous stop completes properly */
if (mddev->sysfs_active)
return -EBUSY;
/*
* Analyze all RAID superblock(s)
*/
if (!mddev->raid_disks) {
if (!mddev->persistent)
return -EINVAL;
analyze_sbs(mddev);
}
if (mddev->level != LEVEL_NONE)
request_module("md-level-%d", mddev->level);
else if (mddev->clevel[0])
request_module("md-%s", mddev->clevel);
/*
* Drop all container device buffers, from now on
* the only valid external interface is through the md
* device.
*/
rdev_for_each(rdev, mddev) {
if (test_bit(Faulty, &rdev->flags))
continue;
sync_blockdev(rdev->bdev);
invalidate_bdev(rdev->bdev);
/* perform some consistency tests on the device.
* We don't want the data to overlap the metadata,
* Internal Bitmap issues have been handled elsewhere.
*/
if (rdev->meta_bdev) {
/* Nothing to check */;
} else if (rdev->data_offset < rdev->sb_start) {
if (mddev->dev_sectors &&
rdev->data_offset + mddev->dev_sectors
> rdev->sb_start) {
printk("md: %s: data overlaps metadata\n",
mdname(mddev));
return -EINVAL;
}
} else {
if (rdev->sb_start + rdev->sb_size/512
> rdev->data_offset) {
printk("md: %s: metadata overlaps data\n",
mdname(mddev));
return -EINVAL;
}
}
sysfs_notify_dirent_safe(rdev->sysfs_state);
}
if (mddev->bio_set == NULL)
mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0);
spin_lock(&pers_lock);
pers = find_pers(mddev->level, mddev->clevel);
if (!pers || !try_module_get(pers->owner)) {
spin_unlock(&pers_lock);
if (mddev->level != LEVEL_NONE)
printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
mddev->level);
else
printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
mddev->clevel);
return -EINVAL;
}
mddev->pers = pers;
spin_unlock(&pers_lock);
if (mddev->level != pers->level) {
mddev->level = pers->level;
mddev->new_level = pers->level;
}
strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
if (mddev->reshape_position != MaxSector &&
pers->start_reshape == NULL) {
/* This personality cannot handle reshaping... */
mddev->pers = NULL;
module_put(pers->owner);
return -EINVAL;
}
if (pers->sync_request) {
/* Warn if this is a potentially silly
* configuration.
*/
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
struct md_rdev *rdev2;
int warned = 0;
rdev_for_each(rdev, mddev)
rdev_for_each(rdev2, mddev) {
if (rdev < rdev2 &&
rdev->bdev->bd_contains ==
rdev2->bdev->bd_contains) {
printk(KERN_WARNING
"%s: WARNING: %s appears to be"
" on the same physical disk as"
" %s.\n",
mdname(mddev),
bdevname(rdev->bdev,b),
bdevname(rdev2->bdev,b2));
warned = 1;
}
}
if (warned)
printk(KERN_WARNING
"True protection against single-disk"
" failure might be compromised.\n");
}
mddev->recovery = 0;
/* may be over-ridden by personality */
mddev->resync_max_sectors = mddev->dev_sectors;
mddev->ok_start_degraded = start_dirty_degraded;
if (start_readonly && mddev->ro == 0)
mddev->ro = 2; /* read-only, but switch on first write */
err = mddev->pers->run(mddev);
if (err)
printk(KERN_ERR "md: pers->run() failed ...\n");
else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
WARN_ONCE(!mddev->external_size, "%s: default size too small,"
" but 'external_size' not in effect?\n", __func__);
printk(KERN_ERR
"md: invalid array_size %llu > default size %llu\n",
(unsigned long long)mddev->array_sectors / 2,
(unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
err = -EINVAL;
mddev->pers->stop(mddev);
}
if (err == 0 && mddev->pers->sync_request &&
(mddev->bitmap_info.file || mddev->bitmap_info.offset)) {
err = bitmap_create(mddev);
if (err) {
printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
mdname(mddev), err);
mddev->pers->stop(mddev);
}
}
if (err) {
module_put(mddev->pers->owner);
mddev->pers = NULL;
bitmap_destroy(mddev);
return err;
}
if (mddev->pers->sync_request) {
if (mddev->kobj.sd &&
sysfs_create_group(&mddev->kobj, &md_redundancy_group))
printk(KERN_WARNING
"md: cannot register extra attributes for %s\n",
mdname(mddev));
mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
} else if (mddev->ro == 2) /* auto-readonly not meaningful */
mddev->ro = 0;
atomic_set(&mddev->writes_pending,0);
atomic_set(&mddev->max_corr_read_errors,
MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
mddev->safemode = 0;
mddev->safemode_timer.function = md_safemode_timeout;
mddev->safemode_timer.data = (unsigned long) mddev;
mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
mddev->in_sync = 1;
smp_wmb();
mddev->ready = 1;
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0)
if (sysfs_link_rdev(mddev, rdev))
/* failure here is OK */;
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
if (mddev->flags)
md_update_sb(mddev, 0);
md_new_event(mddev);
sysfs_notify_dirent_safe(mddev->sysfs_state);
sysfs_notify_dirent_safe(mddev->sysfs_action);
sysfs_notify(&mddev->kobj, NULL, "degraded");
return 0;
}
EXPORT_SYMBOL_GPL(md_run);
static int do_md_run(struct mddev *mddev)
{
int err;
err = md_run(mddev);
if (err)
goto out;
err = bitmap_load(mddev);
if (err) {
bitmap_destroy(mddev);
goto out;
}
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
set_capacity(mddev->gendisk, mddev->array_sectors);
revalidate_disk(mddev->gendisk);
mddev->changed = 1;
kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
out:
return err;
}
static int restart_array(struct mddev *mddev)
{
struct gendisk *disk = mddev->gendisk;
/* Complain if it has no devices */
if (list_empty(&mddev->disks))
return -ENXIO;
if (!mddev->pers)
return -EINVAL;
if (!mddev->ro)
return -EBUSY;
mddev->safemode = 0;
mddev->ro = 0;
set_disk_ro(disk, 0);
printk(KERN_INFO "md: %s switched to read-write mode.\n",
mdname(mddev));
/* Kick recovery or resync if necessary */
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
sysfs_notify_dirent_safe(mddev->sysfs_state);
return 0;
}
/* similar to deny_write_access, but accounts for our holding a reference
* to the file ourselves */
static int deny_bitmap_write_access(struct file * file)
{
struct inode *inode = file->f_mapping->host;
spin_lock(&inode->i_lock);
if (atomic_read(&inode->i_writecount) > 1) {
spin_unlock(&inode->i_lock);
return -ETXTBSY;
}
atomic_set(&inode->i_writecount, -1);
spin_unlock(&inode->i_lock);
return 0;
}
void restore_bitmap_write_access(struct file *file)
{
struct inode *inode = file->f_mapping->host;
spin_lock(&inode->i_lock);
atomic_set(&inode->i_writecount, 1);
spin_unlock(&inode->i_lock);
}
static void md_clean(struct mddev *mddev)
{
mddev->array_sectors = 0;
mddev->external_size = 0;
mddev->dev_sectors = 0;
mddev->raid_disks = 0;
mddev->recovery_cp = 0;
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
mddev->reshape_position = MaxSector;
mddev->external = 0;
mddev->persistent = 0;
mddev->level = LEVEL_NONE;
mddev->clevel[0] = 0;
mddev->flags = 0;
mddev->ro = 0;
mddev->metadata_type[0] = 0;
mddev->chunk_sectors = 0;
mddev->ctime = mddev->utime = 0;
mddev->layout = 0;
mddev->max_disks = 0;
mddev->events = 0;
mddev->can_decrease_events = 0;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
mddev->new_level = LEVEL_NONE;
mddev->new_layout = 0;
mddev->new_chunk_sectors = 0;
mddev->curr_resync = 0;
atomic64_set(&mddev->resync_mismatches, 0);
mddev->suspend_lo = mddev->suspend_hi = 0;
mddev->sync_speed_min = mddev->sync_speed_max = 0;
mddev->recovery = 0;
mddev->in_sync = 0;
mddev->changed = 0;
mddev->degraded = 0;
mddev->safemode = 0;
mddev->merge_check_needed = 0;
mddev->bitmap_info.offset = 0;
mddev->bitmap_info.default_offset = 0;
mddev->bitmap_info.default_space = 0;
mddev->bitmap_info.chunksize = 0;
mddev->bitmap_info.daemon_sleep = 0;
mddev->bitmap_info.max_write_behind = 0;
}
static void __md_stop_writes(struct mddev *mddev)
{
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
reap_sync_thread(mddev);
}
del_timer_sync(&mddev->safemode_timer);
bitmap_flush(mddev);
md_super_wait(mddev);
if (!mddev->in_sync || mddev->flags) {
/* mark array as shutdown cleanly */
mddev->in_sync = 1;
md_update_sb(mddev, 1);
}
}
void md_stop_writes(struct mddev *mddev)
{
mddev_lock(mddev);
__md_stop_writes(mddev);
mddev_unlock(mddev);
}
EXPORT_SYMBOL_GPL(md_stop_writes);
static void __md_stop(struct mddev *mddev)
{
mddev->ready = 0;
mddev->pers->stop(mddev);
if (mddev->pers->sync_request && mddev->to_remove == NULL)
mddev->to_remove = &md_redundancy_group;
module_put(mddev->pers->owner);
mddev->pers = NULL;
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
}
void md_stop(struct mddev *mddev)
{
/* stop the array and free an attached data structures.
* This is called from dm-raid
*/
__md_stop(mddev);
bitmap_destroy(mddev);
if (mddev->bio_set)
bioset_free(mddev->bio_set);
}
EXPORT_SYMBOL_GPL(md_stop);
static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
{
int err = 0;
mutex_lock(&mddev->open_mutex);
if (atomic_read(&mddev->openers) > !!bdev) {
printk("md: %s still in use.\n",mdname(mddev));
err = -EBUSY;
goto out;
}
if (bdev)
sync_blockdev(bdev);
if (mddev->pers) {
__md_stop_writes(mddev);
err = -ENXIO;
if (mddev->ro==1)
goto out;
mddev->ro = 1;
set_disk_ro(mddev->gendisk, 1);
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
sysfs_notify_dirent_safe(mddev->sysfs_state);
err = 0;
}
out:
mutex_unlock(&mddev->open_mutex);
return err;
}
/* mode:
* 0 - completely stop and dis-assemble array
* 2 - stop but do not disassemble array
*/
static int do_md_stop(struct mddev * mddev, int mode,
struct block_device *bdev)
{
struct gendisk *disk = mddev->gendisk;
struct md_rdev *rdev;
mutex_lock(&mddev->open_mutex);
if (atomic_read(&mddev->openers) > !!bdev ||
mddev->sysfs_active) {
printk("md: %s still in use.\n",mdname(mddev));
mutex_unlock(&mddev->open_mutex);
return -EBUSY;
}
if (bdev)
/* It is possible IO was issued on some other
* open file which was closed before we took ->open_mutex.
* As that was not the last close __blkdev_put will not
* have called sync_blockdev, so we must.
*/
sync_blockdev(bdev);
if (mddev->pers) {
if (mddev->ro)
set_disk_ro(disk, 0);
__md_stop_writes(mddev);
__md_stop(mddev);
mddev->queue->merge_bvec_fn = NULL;
mddev->queue->backing_dev_info.congested_fn = NULL;
/* tell userspace to handle 'inactive' */
sysfs_notify_dirent_safe(mddev->sysfs_state);
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0)
sysfs_unlink_rdev(mddev, rdev);
set_capacity(disk, 0);
mutex_unlock(&mddev->open_mutex);
mddev->changed = 1;
revalidate_disk(disk);
if (mddev->ro)
mddev->ro = 0;
} else
mutex_unlock(&mddev->open_mutex);
/*
* Free resources if final stop
*/
if (mode == 0) {
printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
bitmap_destroy(mddev);
if (mddev->bitmap_info.file) {
restore_bitmap_write_access(mddev->bitmap_info.file);
fput(mddev->bitmap_info.file);
mddev->bitmap_info.file = NULL;
}
mddev->bitmap_info.offset = 0;
export_array(mddev);
md_clean(mddev);
kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
if (mddev->hold_active == UNTIL_STOP)
mddev->hold_active = 0;
}
blk_integrity_unregister(disk);
md_new_event(mddev);
sysfs_notify_dirent_safe(mddev->sysfs_state);
return 0;
}
#ifndef MODULE
static void autorun_array(struct mddev *mddev)
{
struct md_rdev *rdev;
int err;
if (list_empty(&mddev->disks))
return;
printk(KERN_INFO "md: running: ");
rdev_for_each(rdev, mddev) {
char b[BDEVNAME_SIZE];
printk("<%s>", bdevname(rdev->bdev,b));
}
printk("\n");
err = do_md_run(mddev);
if (err) {
printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
do_md_stop(mddev, 0, NULL);
}
}
/*
* lets try to run arrays based on all disks that have arrived
* until now. (those are in pending_raid_disks)
*
* the method: pick the first pending disk, collect all disks with
* the same UUID, remove all from the pending list and put them into
* the 'same_array' list. Then order this list based on superblock
* update time (freshest comes first), kick out 'old' disks and
* compare superblocks. If everything's fine then run it.
*
* If "unit" is allocated, then bump its reference count
*/
static void autorun_devices(int part)
{
struct md_rdev *rdev0, *rdev, *tmp;
struct mddev *mddev;
char b[BDEVNAME_SIZE];
printk(KERN_INFO "md: autorun ...\n");
while (!list_empty(&pending_raid_disks)) {
int unit;
dev_t dev;
LIST_HEAD(candidates);
rdev0 = list_entry(pending_raid_disks.next,
struct md_rdev, same_set);
printk(KERN_INFO "md: considering %s ...\n",
bdevname(rdev0->bdev,b));
INIT_LIST_HEAD(&candidates);
rdev_for_each_list(rdev, tmp, &pending_raid_disks)
if (super_90_load(rdev, rdev0, 0) >= 0) {
printk(KERN_INFO "md: adding %s ...\n",
bdevname(rdev->bdev,b));
list_move(&rdev->same_set, &candidates);
}
/*
* now we have a set of devices, with all of them having
* mostly sane superblocks. It's time to allocate the
* mddev.
*/
if (part) {
dev = MKDEV(mdp_major,
rdev0->preferred_minor << MdpMinorShift);
unit = MINOR(dev) >> MdpMinorShift;
} else {
dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
unit = MINOR(dev);
}
if (rdev0->preferred_minor != unit) {
printk(KERN_INFO "md: unit number in %s is bad: %d\n",
bdevname(rdev0->bdev, b), rdev0->preferred_minor);
break;
}
md_probe(dev, NULL, NULL);
mddev = mddev_find(dev);
if (!mddev || !mddev->gendisk) {
if (mddev)
mddev_put(mddev);
printk(KERN_ERR
"md: cannot allocate memory for md drive.\n");
break;
}
if (mddev_lock(mddev))
printk(KERN_WARNING "md: %s locked, cannot run\n",
mdname(mddev));
else if (mddev->raid_disks || mddev->major_version
|| !list_empty(&mddev->disks)) {
printk(KERN_WARNING
"md: %s already running, cannot run %s\n",
mdname(mddev), bdevname(rdev0->bdev,b));
mddev_unlock(mddev);
} else {
printk(KERN_INFO "md: created %s\n", mdname(mddev));
mddev->persistent = 1;
rdev_for_each_list(rdev, tmp, &candidates) {
list_del_init(&rdev->same_set);
if (bind_rdev_to_array(rdev, mddev))
export_rdev(rdev);
}
autorun_array(mddev);
mddev_unlock(mddev);
}
/* on success, candidates will be empty, on error
* it won't...
*/
rdev_for_each_list(rdev, tmp, &candidates) {
list_del_init(&rdev->same_set);
export_rdev(rdev);
}
mddev_put(mddev);
}
printk(KERN_INFO "md: ... autorun DONE.\n");
}
#endif /* !MODULE */
static int get_version(void __user * arg)
{
mdu_version_t ver;
ver.major = MD_MAJOR_VERSION;
ver.minor = MD_MINOR_VERSION;
ver.patchlevel = MD_PATCHLEVEL_VERSION;
if (copy_to_user(arg, &ver, sizeof(ver)))
return -EFAULT;
return 0;
}
static int get_array_info(struct mddev * mddev, void __user * arg)
{
mdu_array_info_t info;
int nr,working,insync,failed,spare;
struct md_rdev *rdev;
nr = working = insync = failed = spare = 0;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev) {
nr++;
if (test_bit(Faulty, &rdev->flags))
failed++;
else {
working++;
if (test_bit(In_sync, &rdev->flags))
insync++;
else
spare++;
}
}
rcu_read_unlock();
info.major_version = mddev->major_version;
info.minor_version = mddev->minor_version;
info.patch_version = MD_PATCHLEVEL_VERSION;
info.ctime = mddev->ctime;
info.level = mddev->level;
info.size = mddev->dev_sectors / 2;
if (info.size != mddev->dev_sectors / 2) /* overflow */
info.size = -1;
info.nr_disks = nr;
info.raid_disks = mddev->raid_disks;
info.md_minor = mddev->md_minor;
info.not_persistent= !mddev->persistent;
info.utime = mddev->utime;
info.state = 0;
if (mddev->in_sync)
info.state = (1<<MD_SB_CLEAN);
if (mddev->bitmap && mddev->bitmap_info.offset)
info.state = (1<<MD_SB_BITMAP_PRESENT);
info.active_disks = insync;
info.working_disks = working;
info.failed_disks = failed;
info.spare_disks = spare;
info.layout = mddev->layout;
info.chunk_size = mddev->chunk_sectors << 9;
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int get_bitmap_file(struct mddev * mddev, void __user * arg)
{
mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
char *ptr, *buf = NULL;
int err = -ENOMEM;
if (md_allow_write(mddev))
file = kmalloc(sizeof(*file), GFP_NOIO);
else
file = kmalloc(sizeof(*file), GFP_KERNEL);
if (!file)
goto out;
/* bitmap disabled, zero the first byte and copy out */
if (!mddev->bitmap || !mddev->bitmap->storage.file) {
file->pathname[0] = '\0';
goto copy_out;
}
buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
if (!buf)
goto out;
ptr = d_path(&mddev->bitmap->storage.file->f_path,
buf, sizeof(file->pathname));
if (IS_ERR(ptr))
goto out;
strcpy(file->pathname, ptr);
copy_out:
err = 0;
if (copy_to_user(arg, file, sizeof(*file)))
err = -EFAULT;
out:
kfree(buf);
kfree(file);
return err;
}
static int get_disk_info(struct mddev * mddev, void __user * arg)
{
mdu_disk_info_t info;
struct md_rdev *rdev;
if (copy_from_user(&info, arg, sizeof(info)))
return -EFAULT;
rcu_read_lock();
rdev = find_rdev_nr_rcu(mddev, info.number);
if (rdev) {
info.major = MAJOR(rdev->bdev->bd_dev);
info.minor = MINOR(rdev->bdev->bd_dev);
info.raid_disk = rdev->raid_disk;
info.state = 0;
if (test_bit(Faulty, &rdev->flags))
info.state |= (1<<MD_DISK_FAULTY);
else if (test_bit(In_sync, &rdev->flags)) {
info.state |= (1<<MD_DISK_ACTIVE);
info.state |= (1<<MD_DISK_SYNC);
}
if (test_bit(WriteMostly, &rdev->flags))
info.state |= (1<<MD_DISK_WRITEMOSTLY);
} else {
info.major = info.minor = 0;
info.raid_disk = -1;
info.state = (1<<MD_DISK_REMOVED);
}
rcu_read_unlock();
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info)
{
char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
struct md_rdev *rdev;
dev_t dev = MKDEV(info->major,info->minor);
if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
return -EOVERFLOW;
if (!mddev->raid_disks) {
int err;
/* expecting a device which has a superblock */
rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
if (IS_ERR(rdev)) {
printk(KERN_WARNING
"md: md_import_device returned %ld\n",
PTR_ERR(rdev));
return PTR_ERR(rdev);
}
if (!list_empty(&mddev->disks)) {
struct md_rdev *rdev0
= list_entry(mddev->disks.next,
struct md_rdev, same_set);
err = super_types[mddev->major_version]
.load_super(rdev, rdev0, mddev->minor_version);
if (err < 0) {
printk(KERN_WARNING
"md: %s has different UUID to %s\n",
bdevname(rdev->bdev,b),
bdevname(rdev0->bdev,b2));
export_rdev(rdev);
return -EINVAL;
}
}
err = bind_rdev_to_array(rdev, mddev);
if (err)
export_rdev(rdev);
return err;
}
/*
* add_new_disk can be used once the array is assembled
* to add "hot spares". They must already have a superblock
* written
*/
if (mddev->pers) {
int err;
if (!mddev->pers->hot_add_disk) {
printk(KERN_WARNING
"%s: personality does not support diskops!\n",
mdname(mddev));
return -EINVAL;
}
if (mddev->persistent)
rdev = md_import_device(dev, mddev->major_version,
mddev->minor_version);
else
rdev = md_import_device(dev, -1, -1);
if (IS_ERR(rdev)) {
printk(KERN_WARNING
"md: md_import_device returned %ld\n",
PTR_ERR(rdev));
return PTR_ERR(rdev);
}
/* set saved_raid_disk if appropriate */
if (!mddev->persistent) {
if (info->state & (1<<MD_DISK_SYNC) &&
info->raid_disk < mddev->raid_disks) {
rdev->raid_disk = info->raid_disk;
set_bit(In_sync, &rdev->flags);
} else
rdev->raid_disk = -1;
} else
super_types[mddev->major_version].
validate_super(mddev, rdev);
if ((info->state & (1<<MD_DISK_SYNC)) &&
rdev->raid_disk != info->raid_disk) {
/* This was a hot-add request, but events doesn't
* match, so reject it.
*/
export_rdev(rdev);
return -EINVAL;
}
if (test_bit(In_sync, &rdev->flags))
rdev->saved_raid_disk = rdev->raid_disk;
else
rdev->saved_raid_disk = -1;
clear_bit(In_sync, &rdev->flags); /* just to be sure */
if (info->state & (1<<MD_DISK_WRITEMOSTLY))
set_bit(WriteMostly, &rdev->flags);
else
clear_bit(WriteMostly, &rdev->flags);
rdev->raid_disk = -1;
err = bind_rdev_to_array(rdev, mddev);
if (!err && !mddev->pers->hot_remove_disk) {
/* If there is hot_add_disk but no hot_remove_disk
* then added disks for geometry changes,
* and should be added immediately.
*/
super_types[mddev->major_version].
validate_super(mddev, rdev);
err = mddev->pers->hot_add_disk(mddev, rdev);
if (err)
unbind_rdev_from_array(rdev);
}
if (err)
export_rdev(rdev);
else
sysfs_notify_dirent_safe(rdev->sysfs_state);
md_update_sb(mddev, 1);
if (mddev->degraded)
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
if (!err)
md_new_event(mddev);
md_wakeup_thread(mddev->thread);
return err;
}
/* otherwise, add_new_disk is only allowed
* for major_version==0 superblocks
*/
if (mddev->major_version != 0) {
printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
mdname(mddev));
return -EINVAL;
}
if (!(info->state & (1<<MD_DISK_FAULTY))) {
int err;
rdev = md_import_device(dev, -1, 0);
if (IS_ERR(rdev)) {
printk(KERN_WARNING
"md: error, md_import_device() returned %ld\n",
PTR_ERR(rdev));
return PTR_ERR(rdev);
}
rdev->desc_nr = info->number;
if (info->raid_disk < mddev->raid_disks)
rdev->raid_disk = info->raid_disk;
else
rdev->raid_disk = -1;
if (rdev->raid_disk < mddev->raid_disks)
if (info->state & (1<<MD_DISK_SYNC))
set_bit(In_sync, &rdev->flags);
if (info->state & (1<<MD_DISK_WRITEMOSTLY))
set_bit(WriteMostly, &rdev->flags);
if (!mddev->persistent) {
printk(KERN_INFO "md: nonpersistent superblock ...\n");
rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
} else
rdev->sb_start = calc_dev_sboffset(rdev);
rdev->sectors = rdev->sb_start;
err = bind_rdev_to_array(rdev, mddev);
if (err) {
export_rdev(rdev);
return err;
}
}
return 0;
}
static int hot_remove_disk(struct mddev * mddev, dev_t dev)
{
char b[BDEVNAME_SIZE];
struct md_rdev *rdev;
rdev = find_rdev(mddev, dev);
if (!rdev)
return -ENXIO;
if (rdev->raid_disk >= 0)
goto busy;
kick_rdev_from_array(rdev);
md_update_sb(mddev, 1);
md_new_event(mddev);
return 0;
busy:
printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
bdevname(rdev->bdev,b), mdname(mddev));
return -EBUSY;
}
static int hot_add_disk(struct mddev * mddev, dev_t dev)
{
char b[BDEVNAME_SIZE];
int err;
struct md_rdev *rdev;
if (!mddev->pers)
return -ENODEV;
if (mddev->major_version != 0) {
printk(KERN_WARNING "%s: HOT_ADD may only be used with"
" version-0 superblocks.\n",
mdname(mddev));
return -EINVAL;
}
if (!mddev->pers->hot_add_disk) {
printk(KERN_WARNING
"%s: personality does not support diskops!\n",
mdname(mddev));
return -EINVAL;
}
rdev = md_import_device(dev, -1, 0);
if (IS_ERR(rdev)) {
printk(KERN_WARNING
"md: error, md_import_device() returned %ld\n",
PTR_ERR(rdev));
return -EINVAL;
}
if (mddev->persistent)
rdev->sb_start = calc_dev_sboffset(rdev);
else
rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
rdev->sectors = rdev->sb_start;
if (test_bit(Faulty, &rdev->flags)) {
printk(KERN_WARNING
"md: can not hot-add faulty %s disk to %s!\n",
bdevname(rdev->bdev,b), mdname(mddev));
err = -EINVAL;
goto abort_export;
}
clear_bit(In_sync, &rdev->flags);
rdev->desc_nr = -1;
rdev->saved_raid_disk = -1;
err = bind_rdev_to_array(rdev, mddev);
if (err)
goto abort_export;
/*
* The rest should better be atomic, we can have disk failures
* noticed in interrupt contexts ...
*/
rdev->raid_disk = -1;
md_update_sb(mddev, 1);
/*
* Kick recovery, maybe this spare has to be added to the
* array immediately.
*/
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_new_event(mddev);
return 0;
abort_export:
export_rdev(rdev);
return err;
}
static int set_bitmap_file(struct mddev *mddev, int fd)
{
int err;
if (mddev->pers) {
if (!mddev->pers->quiesce)
return -EBUSY;
if (mddev->recovery || mddev->sync_thread)
return -EBUSY;
/* we should be able to change the bitmap.. */
}
if (fd >= 0) {
if (mddev->bitmap)
return -EEXIST; /* cannot add when bitmap is present */
mddev->bitmap_info.file = fget(fd);
if (mddev->bitmap_info.file == NULL) {
printk(KERN_ERR "%s: error: failed to get bitmap file\n",
mdname(mddev));
return -EBADF;
}
err = deny_bitmap_write_access(mddev->bitmap_info.file);
if (err) {
printk(KERN_ERR "%s: error: bitmap file is already in use\n",
mdname(mddev));
fput(mddev->bitmap_info.file);
mddev->bitmap_info.file = NULL;
return err;
}
mddev->bitmap_info.offset = 0; /* file overrides offset */
} else if (mddev->bitmap == NULL)
return -ENOENT; /* cannot remove what isn't there */
err = 0;
if (mddev->pers) {
mddev->pers->quiesce(mddev, 1);
if (fd >= 0) {
err = bitmap_create(mddev);
if (!err)
err = bitmap_load(mddev);
}
if (fd < 0 || err) {
bitmap_destroy(mddev);
fd = -1; /* make sure to put the file */
}
mddev->pers->quiesce(mddev, 0);
}
if (fd < 0) {
if (mddev->bitmap_info.file) {
restore_bitmap_write_access(mddev->bitmap_info.file);
fput(mddev->bitmap_info.file);
}
mddev->bitmap_info.file = NULL;
}
return err;
}
/*
* set_array_info is used two different ways
* The original usage is when creating a new array.
* In this usage, raid_disks is > 0 and it together with
* level, size, not_persistent,layout,chunksize determine the
* shape of the array.
* This will always create an array with a type-0.90.0 superblock.
* The newer usage is when assembling an array.
* In this case raid_disks will be 0, and the major_version field is
* use to determine which style super-blocks are to be found on the devices.
* The minor and patch _version numbers are also kept incase the
* super_block handler wishes to interpret them.
*/
static int set_array_info(struct mddev * mddev, mdu_array_info_t *info)
{
if (info->raid_disks == 0) {
/* just setting version number for superblock loading */
if (info->major_version < 0 ||
info->major_version >= ARRAY_SIZE(super_types) ||
super_types[info->major_version].name == NULL) {
/* maybe try to auto-load a module? */
printk(KERN_INFO
"md: superblock version %d not known\n",
info->major_version);
return -EINVAL;
}
mddev->major_version = info->major_version;
mddev->minor_version = info->minor_version;
mddev->patch_version = info->patch_version;
mddev->persistent = !info->not_persistent;
/* ensure mddev_put doesn't delete this now that there
* is some minimal configuration.
*/
mddev->ctime = get_seconds();
return 0;
}
mddev->major_version = MD_MAJOR_VERSION;
mddev->minor_version = MD_MINOR_VERSION;
mddev->patch_version = MD_PATCHLEVEL_VERSION;
mddev->ctime = get_seconds();
mddev->level = info->level;
mddev->clevel[0] = 0;
mddev->dev_sectors = 2 * (sector_t)info->size;
mddev->raid_disks = info->raid_disks;
/* don't set md_minor, it is determined by which /dev/md* was
* openned
*/
if (info->state & (1<<MD_SB_CLEAN))
mddev->recovery_cp = MaxSector;
else
mddev->recovery_cp = 0;
mddev->persistent = ! info->not_persistent;
mddev->external = 0;
mddev->layout = info->layout;
mddev->chunk_sectors = info->chunk_size >> 9;
mddev->max_disks = MD_SB_DISKS;
if (mddev->persistent)
mddev->flags = 0;
set_bit(MD_CHANGE_DEVS, &mddev->flags);
mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9);
mddev->bitmap_info.offset = 0;
mddev->reshape_position = MaxSector;
/*
* Generate a 128 bit UUID
*/
get_random_bytes(mddev->uuid, 16);
mddev->new_level = mddev->level;
mddev->new_chunk_sectors = mddev->chunk_sectors;
mddev->new_layout = mddev->layout;
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
return 0;
}
void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
{
WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
if (mddev->external_size)
return;
mddev->array_sectors = array_sectors;
}
EXPORT_SYMBOL(md_set_array_sectors);
static int update_size(struct mddev *mddev, sector_t num_sectors)
{
struct md_rdev *rdev;
int rv;
int fit = (num_sectors == 0);
if (mddev->pers->resize == NULL)
return -EINVAL;
/* The "num_sectors" is the number of sectors of each device that
* is used. This can only make sense for arrays with redundancy.
* linear and raid0 always use whatever space is available. We can only
* consider changing this number if no resync or reconstruction is
* happening, and if the new size is acceptable. It must fit before the
* sb_start or, if that is <data_offset, it must fit before the size
* of each device. If num_sectors is zero, we find the largest size
* that fits.
*/
if (mddev->sync_thread)
return -EBUSY;
rdev_for_each(rdev, mddev) {
sector_t avail = rdev->sectors;
if (fit && (num_sectors == 0 || num_sectors > avail))
num_sectors = avail;
if (avail < num_sectors)
return -ENOSPC;
}
rv = mddev->pers->resize(mddev, num_sectors);
if (!rv)
revalidate_disk(mddev->gendisk);
return rv;
}
static int update_raid_disks(struct mddev *mddev, int raid_disks)
{
int rv;
struct md_rdev *rdev;
/* change the number of raid disks */
if (mddev->pers->check_reshape == NULL)
return -EINVAL;
if (raid_disks <= 0 ||
(mddev->max_disks && raid_disks >= mddev->max_disks))
return -EINVAL;
if (mddev->sync_thread || mddev->reshape_position != MaxSector)
return -EBUSY;
rdev_for_each(rdev, mddev) {
if (mddev->raid_disks < raid_disks &&
rdev->data_offset < rdev->new_data_offset)
return -EINVAL;
if (mddev->raid_disks > raid_disks &&
rdev->data_offset > rdev->new_data_offset)
return -EINVAL;
}
mddev->delta_disks = raid_disks - mddev->raid_disks;
if (mddev->delta_disks < 0)
mddev->reshape_backwards = 1;
else if (mddev->delta_disks > 0)
mddev->reshape_backwards = 0;
rv = mddev->pers->check_reshape(mddev);
if (rv < 0) {
mddev->delta_disks = 0;
mddev->reshape_backwards = 0;
}
return rv;
}
/*
* update_array_info is used to change the configuration of an
* on-line array.
* The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
* fields in the info are checked against the array.
* Any differences that cannot be handled will cause an error.
* Normally, only one change can be managed at a time.
*/
static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
{
int rv = 0;
int cnt = 0;
int state = 0;
/* calculate expected state,ignoring low bits */
if (mddev->bitmap && mddev->bitmap_info.offset)
state |= (1 << MD_SB_BITMAP_PRESENT);
if (mddev->major_version != info->major_version ||
mddev->minor_version != info->minor_version ||
/* mddev->patch_version != info->patch_version || */
mddev->ctime != info->ctime ||
mddev->level != info->level ||
/* mddev->layout != info->layout || */
!mddev->persistent != info->not_persistent||
mddev->chunk_sectors != info->chunk_size >> 9 ||
/* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
((state^info->state) & 0xfffffe00)
)
return -EINVAL;
/* Check there is only one change */
if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
cnt++;
if (mddev->raid_disks != info->raid_disks)
cnt++;
if (mddev->layout != info->layout)
cnt++;
if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
cnt++;
if (cnt == 0)
return 0;
if (cnt > 1)
return -EINVAL;
if (mddev->layout != info->layout) {
/* Change layout
* we don't need to do anything at the md level, the
* personality will take care of it all.
*/
if (mddev->pers->check_reshape == NULL)
return -EINVAL;
else {
mddev->new_layout = info->layout;
rv = mddev->pers->check_reshape(mddev);
if (rv)
mddev->new_layout = mddev->layout;
return rv;
}
}
if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
rv = update_size(mddev, (sector_t)info->size * 2);
if (mddev->raid_disks != info->raid_disks)
rv = update_raid_disks(mddev, info->raid_disks);
if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
if (mddev->pers->quiesce == NULL)
return -EINVAL;
if (mddev->recovery || mddev->sync_thread)
return -EBUSY;
if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
/* add the bitmap */
if (mddev->bitmap)
return -EEXIST;
if (mddev->bitmap_info.default_offset == 0)
return -EINVAL;
mddev->bitmap_info.offset =
mddev->bitmap_info.default_offset;
mddev->bitmap_info.space =
mddev->bitmap_info.default_space;
mddev->pers->quiesce(mddev, 1);
rv = bitmap_create(mddev);
if (!rv)
rv = bitmap_load(mddev);
if (rv)
bitmap_destroy(mddev);
mddev->pers->quiesce(mddev, 0);
} else {
/* remove the bitmap */
if (!mddev->bitmap)
return -ENOENT;
if (mddev->bitmap->storage.file)
return -EINVAL;
mddev->pers->quiesce(mddev, 1);
bitmap_destroy(mddev);
mddev->pers->quiesce(mddev, 0);
mddev->bitmap_info.offset = 0;
}
}
md_update_sb(mddev, 1);
return rv;
}
static int set_disk_faulty(struct mddev *mddev, dev_t dev)
{
struct md_rdev *rdev;
int err = 0;
if (mddev->pers == NULL)
return -ENODEV;
rcu_read_lock();
rdev = find_rdev_rcu(mddev, dev);
if (!rdev)
err = -ENODEV;
else {
md_error(mddev, rdev);
if (!test_bit(Faulty, &rdev->flags))
err = -EBUSY;
}
rcu_read_unlock();
return err;
}
/*
* We have a problem here : there is no easy way to give a CHS
* virtual geometry. We currently pretend that we have a 2 heads
* 4 sectors (with a BIG number of cylinders...). This drives
* dosfs just mad... ;-)
*/
static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct mddev *mddev = bdev->bd_disk->private_data;
geo->heads = 2;
geo->sectors = 4;
geo->cylinders = mddev->array_sectors / 8;
return 0;
}
static int md_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
int err = 0;
void __user *argp = (void __user *)arg;
struct mddev *mddev = NULL;
int ro;
switch (cmd) {
case RAID_VERSION:
case GET_ARRAY_INFO:
case GET_DISK_INFO:
break;
default:
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
}
/*
* Commands dealing with the RAID driver but not any
* particular array:
*/
switch (cmd) {
case RAID_VERSION:
err = get_version(argp);
goto done;
case PRINT_RAID_DEBUG:
err = 0;
md_print_devices();
goto done;
#ifndef MODULE
case RAID_AUTORUN:
err = 0;
autostart_arrays(arg);
goto done;
#endif
default:;
}
/*
* Commands creating/starting a new array:
*/
mddev = bdev->bd_disk->private_data;
if (!mddev) {
BUG();
goto abort;
}
/* Some actions do not requires the mutex */
switch (cmd) {
case GET_ARRAY_INFO:
if (!mddev->raid_disks && !mddev->external)
err = -ENODEV;
else
err = get_array_info(mddev, argp);
goto abort;
case GET_DISK_INFO:
if (!mddev->raid_disks && !mddev->external)
err = -ENODEV;
else
err = get_disk_info(mddev, argp);
goto abort;
case SET_DISK_FAULTY:
err = set_disk_faulty(mddev, new_decode_dev(arg));
goto abort;
}
if (cmd == ADD_NEW_DISK)
/* need to ensure md_delayed_delete() has completed */
flush_workqueue(md_misc_wq);
err = mddev_lock(mddev);
if (err) {
printk(KERN_INFO
"md: ioctl lock interrupted, reason %d, cmd %d\n",
err, cmd);
goto abort;
}
if (cmd == SET_ARRAY_INFO) {
mdu_array_info_t info;
if (!arg)
memset(&info, 0, sizeof(info));
else if (copy_from_user(&info, argp, sizeof(info))) {
err = -EFAULT;
goto abort_unlock;
}
if (mddev->pers) {
err = update_array_info(mddev, &info);
if (err) {
printk(KERN_WARNING "md: couldn't update"
" array info. %d\n", err);
goto abort_unlock;
}
goto done_unlock;
}
if (!list_empty(&mddev->disks)) {
printk(KERN_WARNING
"md: array %s already has disks!\n",
mdname(mddev));
err = -EBUSY;
goto abort_unlock;
}
if (mddev->raid_disks) {
printk(KERN_WARNING
"md: array %s already initialised!\n",
mdname(mddev));
err = -EBUSY;
goto abort_unlock;
}
err = set_array_info(mddev, &info);
if (err) {
printk(KERN_WARNING "md: couldn't set"
" array info. %d\n", err);
goto abort_unlock;
}
goto done_unlock;
}
/*
* Commands querying/configuring an existing array:
*/
/* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
* RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
if ((!mddev->raid_disks && !mddev->external)
&& cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
&& cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
&& cmd != GET_BITMAP_FILE) {
err = -ENODEV;
goto abort_unlock;
}
/*
* Commands even a read-only array can execute:
*/
switch (cmd) {
case GET_BITMAP_FILE:
err = get_bitmap_file(mddev, argp);
goto done_unlock;
case RESTART_ARRAY_RW:
err = restart_array(mddev);
goto done_unlock;
case STOP_ARRAY:
err = do_md_stop(mddev, 0, bdev);
goto done_unlock;
case STOP_ARRAY_RO:
err = md_set_readonly(mddev, bdev);
goto done_unlock;
case BLKROSET:
if (get_user(ro, (int __user *)(arg))) {
err = -EFAULT;
goto done_unlock;
}
err = -EINVAL;
/* if the bdev is going readonly the value of mddev->ro
* does not matter, no writes are coming
*/
if (ro)
goto done_unlock;
/* are we are already prepared for writes? */
if (mddev->ro != 1)
goto done_unlock;
/* transitioning to readauto need only happen for
* arrays that call md_write_start
*/
if (mddev->pers) {
err = restart_array(mddev);
if (err == 0) {
mddev->ro = 2;
set_disk_ro(mddev->gendisk, 0);
}
}
goto done_unlock;
}
/*
* The remaining ioctls are changing the state of the
* superblock, so we do not allow them on read-only arrays.
* However non-MD ioctls (e.g. get-size) will still come through
* here and hit the 'default' below, so only disallow
* 'md' ioctls, and switch to rw mode if started auto-readonly.
*/
if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
if (mddev->ro == 2) {
mddev->ro = 0;
sysfs_notify_dirent_safe(mddev->sysfs_state);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
/* mddev_unlock will wake thread */
/* If a device failed while we were read-only, we
* need to make sure the metadata is updated now.
*/
if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
mddev_unlock(mddev);
wait_event(mddev->sb_wait,
!test_bit(MD_CHANGE_DEVS, &mddev->flags) &&
!test_bit(MD_CHANGE_PENDING, &mddev->flags));
mddev_lock(mddev);
}
} else {
err = -EROFS;
goto abort_unlock;
}
}
switch (cmd) {
case ADD_NEW_DISK:
{
mdu_disk_info_t info;
if (copy_from_user(&info, argp, sizeof(info)))
err = -EFAULT;
else
err = add_new_disk(mddev, &info);
goto done_unlock;
}
case HOT_REMOVE_DISK:
err = hot_remove_disk(mddev, new_decode_dev(arg));
goto done_unlock;
case HOT_ADD_DISK:
err = hot_add_disk(mddev, new_decode_dev(arg));
goto done_unlock;
case RUN_ARRAY:
err = do_md_run(mddev);
goto done_unlock;
case SET_BITMAP_FILE:
err = set_bitmap_file(mddev, (int)arg);
goto done_unlock;
default:
err = -EINVAL;
goto abort_unlock;
}
done_unlock:
abort_unlock:
if (mddev->hold_active == UNTIL_IOCTL &&
err != -EINVAL)
mddev->hold_active = 0;
mddev_unlock(mddev);
return err;
done:
if (err)
MD_BUG();
abort:
return err;
}
#ifdef CONFIG_COMPAT
static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case HOT_REMOVE_DISK:
case HOT_ADD_DISK:
case SET_DISK_FAULTY:
case SET_BITMAP_FILE:
/* These take in integer arg, do not convert */
break;
default:
arg = (unsigned long)compat_ptr(arg);
break;
}
return md_ioctl(bdev, mode, cmd, arg);
}
#endif /* CONFIG_COMPAT */
static int md_open(struct block_device *bdev, fmode_t mode)
{
/*
* Succeed if we can lock the mddev, which confirms that
* it isn't being stopped right now.
*/
struct mddev *mddev = mddev_find(bdev->bd_dev);
int err;
if (!mddev)
return -ENODEV;
if (mddev->gendisk != bdev->bd_disk) {
/* we are racing with mddev_put which is discarding this
* bd_disk.
*/
mddev_put(mddev);
/* Wait until bdev->bd_disk is definitely gone */
flush_workqueue(md_misc_wq);
/* Then retry the open from the top */
return -ERESTARTSYS;
}
BUG_ON(mddev != bdev->bd_disk->private_data);
if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
goto out;
err = 0;
atomic_inc(&mddev->openers);
mutex_unlock(&mddev->open_mutex);
check_disk_change(bdev);
out:
return err;
}
static int md_release(struct gendisk *disk, fmode_t mode)
{
struct mddev *mddev = disk->private_data;
BUG_ON(!mddev);
atomic_dec(&mddev->openers);
mddev_put(mddev);
return 0;
}
static int md_media_changed(struct gendisk *disk)
{
struct mddev *mddev = disk->private_data;
return mddev->changed;
}
static int md_revalidate(struct gendisk *disk)
{
struct mddev *mddev = disk->private_data;
mddev->changed = 0;
return 0;
}
static const struct block_device_operations md_fops =
{
.owner = THIS_MODULE,
.open = md_open,
.release = md_release,
.ioctl = md_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = md_compat_ioctl,
#endif
.getgeo = md_getgeo,
.media_changed = md_media_changed,
.revalidate_disk= md_revalidate,
};
static int md_thread(void * arg)
{
struct md_thread *thread = arg;
/*
* md_thread is a 'system-thread', it's priority should be very
* high. We avoid resource deadlocks individually in each
* raid personality. (RAID5 does preallocation) We also use RR and
* the very same RT priority as kswapd, thus we will never get
* into a priority inversion deadlock.
*
* we definitely have to have equal or higher priority than
* bdflush, otherwise bdflush will deadlock if there are too
* many dirty RAID5 blocks.
*/
allow_signal(SIGKILL);
while (!kthread_should_stop()) {
/* We need to wait INTERRUPTIBLE so that
* we don't add to the load-average.
* That means we need to be sure no signals are
* pending
*/
if (signal_pending(current))
flush_signals(current);
wait_event_interruptible_timeout
(thread->wqueue,
test_bit(THREAD_WAKEUP, &thread->flags)
|| kthread_should_stop(),
thread->timeout);
clear_bit(THREAD_WAKEUP, &thread->flags);
if (!kthread_should_stop())
thread->run(thread);
}
return 0;
}
void md_wakeup_thread(struct md_thread *thread)
{
if (thread) {
pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
set_bit(THREAD_WAKEUP, &thread->flags);
wake_up(&thread->wqueue);
}
}
struct md_thread *md_register_thread(void (*run) (struct md_thread *),
struct mddev *mddev, const char *name)
{
struct md_thread *thread;
thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
if (!thread)
return NULL;
init_waitqueue_head(&thread->wqueue);
thread->run = run;
thread->mddev = mddev;
thread->timeout = MAX_SCHEDULE_TIMEOUT;
thread->tsk = kthread_run(md_thread, thread,
"%s_%s",
mdname(thread->mddev),
name);
if (IS_ERR(thread->tsk)) {
kfree(thread);
return NULL;
}
return thread;
}
void md_unregister_thread(struct md_thread **threadp)
{
struct md_thread *thread = *threadp;
if (!thread)
return;
pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
/* Locking ensures that mddev_unlock does not wake_up a
* non-existent thread
*/
spin_lock(&pers_lock);
*threadp = NULL;
spin_unlock(&pers_lock);
kthread_stop(thread->tsk);
kfree(thread);
}
void md_error(struct mddev *mddev, struct md_rdev *rdev)
{
if (!mddev) {
MD_BUG();
return;
}
if (!rdev || test_bit(Faulty, &rdev->flags))
return;
if (!mddev->pers || !mddev->pers->error_handler)
return;
mddev->pers->error_handler(mddev,rdev);
if (mddev->degraded)
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
sysfs_notify_dirent_safe(rdev->sysfs_state);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
if (mddev->event_work.func)
queue_work(md_misc_wq, &mddev->event_work);
md_new_event_inintr(mddev);
}
/* seq_file implementation /proc/mdstat */
static void status_unused(struct seq_file *seq)
{
int i = 0;
struct md_rdev *rdev;
seq_printf(seq, "unused devices: ");
list_for_each_entry(rdev, &pending_raid_disks, same_set) {
char b[BDEVNAME_SIZE];
i++;
seq_printf(seq, "%s ",
bdevname(rdev->bdev,b));
}
if (!i)
seq_printf(seq, "<none>");
seq_printf(seq, "\n");
}
static void status_resync(struct seq_file *seq, struct mddev * mddev)
{
sector_t max_sectors, resync, res;
unsigned long dt, db;
sector_t rt;
int scale;
unsigned int per_milli;
if (mddev->curr_resync <= 3)
resync = 0;
else
resync = mddev->curr_resync
- atomic_read(&mddev->recovery_active);
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
max_sectors = mddev->resync_max_sectors;
else
max_sectors = mddev->dev_sectors;
/*
* Should not happen.
*/
if (!max_sectors) {
MD_BUG();
return;
}
/* Pick 'scale' such that (resync>>scale)*1000 will fit
* in a sector_t, and (max_sectors>>scale) will fit in a
* u32, as those are the requirements for sector_div.
* Thus 'scale' must be at least 10
*/
scale = 10;
if (sizeof(sector_t) > sizeof(unsigned long)) {
while ( max_sectors/2 > (1ULL<<(scale+32)))
scale++;
}
res = (resync>>scale)*1000;
sector_div(res, (u32)((max_sectors>>scale)+1));
per_milli = res;
{
int i, x = per_milli/50, y = 20-x;
seq_printf(seq, "[");
for (i = 0; i < x; i++)
seq_printf(seq, "=");
seq_printf(seq, ">");
for (i = 0; i < y; i++)
seq_printf(seq, ".");
seq_printf(seq, "] ");
}
seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
(test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
"reshape" :
(test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
"check" :
(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
"resync" : "recovery"))),
per_milli/10, per_milli % 10,
(unsigned long long) resync/2,
(unsigned long long) max_sectors/2);
/*
* dt: time from mark until now
* db: blocks written from mark until now
* rt: remaining time
*
* rt is a sector_t, so could be 32bit or 64bit.
* So we divide before multiply in case it is 32bit and close
* to the limit.
* We scale the divisor (db) by 32 to avoid losing precision
* near the end of resync when the number of remaining sectors
* is close to 'db'.
* We then divide rt by 32 after multiplying by db to compensate.
* The '+1' avoids division by zero if db is very small.
*/
dt = ((jiffies - mddev->resync_mark) / HZ);
if (!dt) dt++;
db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
- mddev->resync_mark_cnt;
rt = max_sectors - resync; /* number of remaining sectors */
sector_div(rt, db/32+1);
rt *= dt;
rt >>= 5;
seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
((unsigned long)rt % 60)/6);
seq_printf(seq, " speed=%ldK/sec", db/2/dt);
}
static void *md_seq_start(struct seq_file *seq, loff_t *pos)
{
struct list_head *tmp;
loff_t l = *pos;
struct mddev *mddev;
if (l >= 0x10000)
return NULL;
if (!l--)
/* header */
return (void*)1;
spin_lock(&all_mddevs_lock);
list_for_each(tmp,&all_mddevs)
if (!l--) {
mddev = list_entry(tmp, struct mddev, all_mddevs);
mddev_get(mddev);
spin_unlock(&all_mddevs_lock);
return mddev;
}
spin_unlock(&all_mddevs_lock);
if (!l--)
return (void*)2;/* tail */
return NULL;
}
static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct list_head *tmp;
struct mddev *next_mddev, *mddev = v;
++*pos;
if (v == (void*)2)
return NULL;
spin_lock(&all_mddevs_lock);
if (v == (void*)1)
tmp = all_mddevs.next;
else
tmp = mddev->all_mddevs.next;
if (tmp != &all_mddevs)
next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs));
else {
next_mddev = (void*)2;
*pos = 0x10000;
}
spin_unlock(&all_mddevs_lock);
if (v != (void*)1)
mddev_put(mddev);
return next_mddev;
}
static void md_seq_stop(struct seq_file *seq, void *v)
{
struct mddev *mddev = v;
if (mddev && v != (void*)1 && v != (void*)2)
mddev_put(mddev);
}
static int md_seq_show(struct seq_file *seq, void *v)
{
struct mddev *mddev = v;
sector_t sectors;
struct md_rdev *rdev;
if (v == (void*)1) {
struct md_personality *pers;
seq_printf(seq, "Personalities : ");
spin_lock(&pers_lock);
list_for_each_entry(pers, &pers_list, list)
seq_printf(seq, "[%s] ", pers->name);
spin_unlock(&pers_lock);
seq_printf(seq, "\n");
seq->poll_event = atomic_read(&md_event_count);
return 0;
}
if (v == (void*)2) {
status_unused(seq);
return 0;
}
if (mddev_lock(mddev) < 0)
return -EINTR;
if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
seq_printf(seq, "%s : %sactive", mdname(mddev),
mddev->pers ? "" : "in");
if (mddev->pers) {
if (mddev->ro==1)
seq_printf(seq, " (read-only)");
if (mddev->ro==2)
seq_printf(seq, " (auto-read-only)");
seq_printf(seq, " %s", mddev->pers->name);
}
sectors = 0;
rdev_for_each(rdev, mddev) {
char b[BDEVNAME_SIZE];
seq_printf(seq, " %s[%d]",
bdevname(rdev->bdev,b), rdev->desc_nr);
if (test_bit(WriteMostly, &rdev->flags))
seq_printf(seq, "(W)");
if (test_bit(Faulty, &rdev->flags)) {
seq_printf(seq, "(F)");
continue;
}
if (rdev->raid_disk < 0)
seq_printf(seq, "(S)"); /* spare */
if (test_bit(Replacement, &rdev->flags))
seq_printf(seq, "(R)");
sectors += rdev->sectors;
}
if (!list_empty(&mddev->disks)) {
if (mddev->pers)
seq_printf(seq, "\n %llu blocks",
(unsigned long long)
mddev->array_sectors / 2);
else
seq_printf(seq, "\n %llu blocks",
(unsigned long long)sectors / 2);
}
if (mddev->persistent) {
if (mddev->major_version != 0 ||
mddev->minor_version != 90) {
seq_printf(seq," super %d.%d",
mddev->major_version,
mddev->minor_version);
}
} else if (mddev->external)
seq_printf(seq, " super external:%s",
mddev->metadata_type);
else
seq_printf(seq, " super non-persistent");
if (mddev->pers) {
mddev->pers->status(seq, mddev);
seq_printf(seq, "\n ");
if (mddev->pers->sync_request) {
if (mddev->curr_resync > 2) {
status_resync(seq, mddev);
seq_printf(seq, "\n ");
} else if (mddev->curr_resync >= 1)
seq_printf(seq, "\tresync=DELAYED\n ");
else if (mddev->recovery_cp < MaxSector)
seq_printf(seq, "\tresync=PENDING\n ");
}
} else
seq_printf(seq, "\n ");
bitmap_status(seq, mddev->bitmap);
seq_printf(seq, "\n");
}
mddev_unlock(mddev);
return 0;
}
static const struct seq_operations md_seq_ops = {
.start = md_seq_start,
.next = md_seq_next,
.stop = md_seq_stop,
.show = md_seq_show,
};
static int md_seq_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
int error;
error = seq_open(file, &md_seq_ops);
if (error)
return error;
seq = file->private_data;
seq->poll_event = atomic_read(&md_event_count);
return error;
}
static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
{
struct seq_file *seq = filp->private_data;
int mask;
poll_wait(filp, &md_event_waiters, wait);
/* always allow read */
mask = POLLIN | POLLRDNORM;
if (seq->poll_event != atomic_read(&md_event_count))
mask |= POLLERR | POLLPRI;
return mask;
}
static const struct file_operations md_seq_fops = {
.owner = THIS_MODULE,
.open = md_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
.poll = mdstat_poll,
};
int register_md_personality(struct md_personality *p)
{
spin_lock(&pers_lock);
list_add_tail(&p->list, &pers_list);
printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
spin_unlock(&pers_lock);
return 0;
}
int unregister_md_personality(struct md_personality *p)
{
printk(KERN_INFO "md: %s personality unregistered\n", p->name);
spin_lock(&pers_lock);
list_del_init(&p->list);
spin_unlock(&pers_lock);
return 0;
}
static int is_mddev_idle(struct mddev *mddev, int init)
{
struct md_rdev * rdev;
int idle;
int curr_events;
idle = 1;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev) {
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
(int)part_stat_read(&disk->part0, sectors[1]) -
atomic_read(&disk->sync_io);
/* sync IO will cause sync_io to increase before the disk_stats
* as sync_io is counted when a request starts, and
* disk_stats is counted when it completes.
* So resync activity will cause curr_events to be smaller than
* when there was no such activity.
* non-sync IO will cause disk_stat to increase without
* increasing sync_io so curr_events will (eventually)
* be larger than it was before. Once it becomes
* substantially larger, the test below will cause
* the array to appear non-idle, and resync will slow
* down.
* If there is a lot of outstanding resync activity when
* we set last_event to curr_events, then all that activity
* completing might cause the array to appear non-idle
* and resync will be slowed down even though there might
* not have been non-resync activity. This will only
* happen once though. 'last_events' will soon reflect
* the state where there is little or no outstanding
* resync requests, and further resync activity will
* always make curr_events less than last_events.
*
*/
if (init || curr_events - rdev->last_events > 64) {
rdev->last_events = curr_events;
idle = 0;
}
}
rcu_read_unlock();
return idle;
}
void md_done_sync(struct mddev *mddev, int blocks, int ok)
{
/* another "blocks" (512byte) blocks have been synced */
atomic_sub(blocks, &mddev->recovery_active);
wake_up(&mddev->recovery_wait);
if (!ok) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
set_bit(MD_RECOVERY_ERROR, &mddev->recovery);
md_wakeup_thread(mddev->thread);
// stop recovery, signal do_sync ....
}
}
/* md_write_start(mddev, bi)
* If we need to update some array metadata (e.g. 'active' flag
* in superblock) before writing, schedule a superblock update
* and wait for it to complete.
*/
void md_write_start(struct mddev *mddev, struct bio *bi)
{
int did_change = 0;
if (bio_data_dir(bi) != WRITE)
return;
BUG_ON(mddev->ro == 1);
if (mddev->ro == 2) {
/* need to switch to read/write */
mddev->ro = 0;
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
did_change = 1;
}
atomic_inc(&mddev->writes_pending);
if (mddev->safemode == 1)
mddev->safemode = 0;
if (mddev->in_sync) {
spin_lock_irq(&mddev->write_lock);
if (mddev->in_sync) {
mddev->in_sync = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
set_bit(MD_CHANGE_PENDING, &mddev->flags);
md_wakeup_thread(mddev->thread);
did_change = 1;
}
spin_unlock_irq(&mddev->write_lock);
}
if (did_change)
sysfs_notify_dirent_safe(mddev->sysfs_state);
wait_event(mddev->sb_wait,
!test_bit(MD_CHANGE_PENDING, &mddev->flags));
}
void md_write_end(struct mddev *mddev)
{
if (atomic_dec_and_test(&mddev->writes_pending)) {
if (mddev->safemode == 2)
md_wakeup_thread(mddev->thread);
else if (mddev->safemode_delay)
mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
}
}
/* md_allow_write(mddev)
* Calling this ensures that the array is marked 'active' so that writes
* may proceed without blocking. It is important to call this before
* attempting a GFP_KERNEL allocation while holding the mddev lock.
* Must be called with mddev_lock held.
*
* In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
* is dropped, so return -EAGAIN after notifying userspace.
*/
int md_allow_write(struct mddev *mddev)
{
if (!mddev->pers)
return 0;
if (mddev->ro)
return 0;
if (!mddev->pers->sync_request)
return 0;
spin_lock_irq(&mddev->write_lock);
if (mddev->in_sync) {
mddev->in_sync = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
set_bit(MD_CHANGE_PENDING, &mddev->flags);
if (mddev->safemode_delay &&
mddev->safemode == 0)
mddev->safemode = 1;
spin_unlock_irq(&mddev->write_lock);
md_update_sb(mddev, 0);
sysfs_notify_dirent_safe(mddev->sysfs_state);
} else
spin_unlock_irq(&mddev->write_lock);
if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
return -EAGAIN;
else
return 0;
}
EXPORT_SYMBOL_GPL(md_allow_write);
#define SYNC_MARKS 10
#define SYNC_MARK_STEP (3*HZ)
#define UPDATE_FREQUENCY (5*60*HZ)
void md_do_sync(struct md_thread *thread)
{
struct mddev *mddev = thread->mddev;
struct mddev *mddev2;
unsigned int currspeed = 0,
window;
sector_t max_sectors,j, io_sectors;
unsigned long mark[SYNC_MARKS];
unsigned long update_time;
sector_t mark_cnt[SYNC_MARKS];
int last_mark,m;
struct list_head *tmp;
sector_t last_check;
int skipped = 0;
struct md_rdev *rdev;
char *desc;
struct blk_plug plug;
/* just incase thread restarts... */
if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
return;
if (mddev->ro) /* never try to sync a read-only array */
return;
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
desc = "data-check";
else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
desc = "requested-resync";
else
desc = "resync";
} else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
desc = "reshape";
else
desc = "recovery";
/* we overload curr_resync somewhat here.
* 0 == not engaged in resync at all
* 2 == checking that there is no conflict with another sync
* 1 == like 2, but have yielded to allow conflicting resync to
* commense
* other == active in resync - this many blocks
*
* Before starting a resync we must have set curr_resync to
* 2, and then checked that every "conflicting" array has curr_resync
* less than ours. When we find one that is the same or higher
* we wait on resync_wait. To avoid deadlock, we reduce curr_resync
* to 1 if we choose to yield (based arbitrarily on address of mddev structure).
* This will mean we have to start checking from the beginning again.
*
*/
do {
mddev->curr_resync = 2;
try_again:
if (kthread_should_stop())
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
goto skip;
for_each_mddev(mddev2, tmp) {
if (mddev2 == mddev)
continue;
if (!mddev->parallel_resync
&& mddev2->curr_resync
&& match_mddev_units(mddev, mddev2)) {
DEFINE_WAIT(wq);
if (mddev < mddev2 && mddev->curr_resync == 2) {
/* arbitrarily yield */
mddev->curr_resync = 1;
wake_up(&resync_wait);
}
if (mddev > mddev2 && mddev->curr_resync == 1)
/* no need to wait here, we can wait the next
* time 'round when curr_resync == 2
*/
continue;
/* We need to wait 'interruptible' so as not to
* contribute to the load average, and not to
* be caught by 'softlockup'
*/
prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
if (!kthread_should_stop() &&
mddev2->curr_resync >= mddev->curr_resync) {
printk(KERN_INFO "md: delaying %s of %s"
" until %s has finished (they"
" share one or more physical units)\n",
desc, mdname(mddev), mdname(mddev2));
mddev_put(mddev2);
if (signal_pending(current))
flush_signals(current);
schedule();
finish_wait(&resync_wait, &wq);
goto try_again;
}
finish_wait(&resync_wait, &wq);
}
}
} while (mddev->curr_resync < 2);
j = 0;
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
/* resync follows the size requested by the personality,
* which defaults to physical size, but can be virtual size
*/
max_sectors = mddev->resync_max_sectors;
atomic64_set(&mddev->resync_mismatches, 0);
/* we don't use the checkpoint if there's a bitmap */
if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
j = mddev->resync_min;
else if (!mddev->bitmap)
j = mddev->recovery_cp;
} else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
max_sectors = mddev->resync_max_sectors;
else {
/* recovery follows the physical size of devices */
max_sectors = mddev->dev_sectors;
j = MaxSector;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
rdev->recovery_offset < j)
j = rdev->recovery_offset;
rcu_read_unlock();
}
printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
printk(KERN_INFO "md: minimum _guaranteed_ speed:"
" %d KB/sec/disk.\n", speed_min(mddev));
printk(KERN_INFO "md: using maximum available idle IO bandwidth "
"(but not more than %d KB/sec) for %s.\n",
speed_max(mddev), desc);
is_mddev_idle(mddev, 1); /* this initializes IO event counters */
io_sectors = 0;
for (m = 0; m < SYNC_MARKS; m++) {
mark[m] = jiffies;
mark_cnt[m] = io_sectors;
}
last_mark = 0;
mddev->resync_mark = mark[last_mark];
mddev->resync_mark_cnt = mark_cnt[last_mark];
/*
* Tune reconstruction:
*/
window = 32*(PAGE_SIZE/512);
printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n",
window/2, (unsigned long long)max_sectors/2);
atomic_set(&mddev->recovery_active, 0);
last_check = 0;
if (j>2) {
printk(KERN_INFO
"md: resuming %s of %s from checkpoint.\n",
desc, mdname(mddev));
mddev->curr_resync = j;
} else
mddev->curr_resync = 3; /* no longer delayed */
mddev->curr_resync_completed = j;
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
md_new_event(mddev);
update_time = jiffies;
blk_start_plug(&plug);
while (j < max_sectors) {
sector_t sectors;
skipped = 0;
if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
((mddev->curr_resync > mddev->curr_resync_completed &&
(mddev->curr_resync - mddev->curr_resync_completed)
> (max_sectors >> 4)) ||
time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) ||
(j - mddev->curr_resync_completed)*2
>= mddev->resync_max - mddev->curr_resync_completed
)) {
/* time to update curr_resync_completed */
wait_event(mddev->recovery_wait,
atomic_read(&mddev->recovery_active) == 0);
mddev->curr_resync_completed = j;
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
j > mddev->recovery_cp)
mddev->recovery_cp = j;
update_time = jiffies;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
}
while (j >= mddev->resync_max && !kthread_should_stop()) {
/* As this condition is controlled by user-space,
* we can block indefinitely, so use '_interruptible'
* to avoid triggering warnings.
*/
flush_signals(current); /* just in case */
wait_event_interruptible(mddev->recovery_wait,
mddev->resync_max > j
|| kthread_should_stop());
}
if (kthread_should_stop())
goto interrupted;
sectors = mddev->pers->sync_request(mddev, j, &skipped,
currspeed < speed_min(mddev));
if (sectors == 0) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
goto out;
}
if (!skipped) { /* actual IO requested */
io_sectors += sectors;
atomic_add(sectors, &mddev->recovery_active);
}
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
break;
j += sectors;
if (j > 2)
mddev->curr_resync = j;
mddev->curr_mark_cnt = io_sectors;
if (last_check == 0)
/* this is the earliest that rebuild will be
* visible in /proc/mdstat
*/
md_new_event(mddev);
if (last_check + window > io_sectors || j == max_sectors)
continue;
last_check = io_sectors;
repeat:
if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
/* step marks */
int next = (last_mark+1) % SYNC_MARKS;
mddev->resync_mark = mark[next];
mddev->resync_mark_cnt = mark_cnt[next];
mark[next] = jiffies;
mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
last_mark = next;
}
if (kthread_should_stop())
goto interrupted;
/*
* this loop exits only if either when we are slower than
* the 'hard' speed limit, or the system was IO-idle for
* a jiffy.
* the system might be non-idle CPU-wise, but we only care
* about not overloading the IO subsystem. (things like an
* e2fsck being done on the RAID array should execute fast)
*/
cond_resched();
currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
/((jiffies-mddev->resync_mark)/HZ +1) +1;
if (currspeed > speed_min(mddev)) {
if ((currspeed > speed_max(mddev)) ||
!is_mddev_idle(mddev, 0)) {
msleep(500);
goto repeat;
}
}
}
printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
/*
* this also signals 'finished resyncing' to md_stop
*/
out:
blk_finish_plug(&plug);
wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
/* tell personality that we are finished */
mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
mddev->curr_resync > 2) {
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
if (mddev->curr_resync >= mddev->recovery_cp) {
printk(KERN_INFO
"md: checkpointing %s of %s.\n",
desc, mdname(mddev));
if (test_bit(MD_RECOVERY_ERROR,
&mddev->recovery))
mddev->recovery_cp =
mddev->curr_resync_completed;
else
mddev->recovery_cp =
mddev->curr_resync;
}
} else
mddev->recovery_cp = MaxSector;
} else {
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
mddev->curr_resync = MaxSector;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev)
if (rdev->raid_disk >= 0 &&
mddev->delta_disks >= 0 &&
!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
rdev->recovery_offset < mddev->curr_resync)
rdev->recovery_offset = mddev->curr_resync;
rcu_read_unlock();
}
}
skip:
set_bit(MD_CHANGE_DEVS, &mddev->flags);
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
/* We completed so min/max setting can be forgotten if used. */
if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
mddev->resync_min = 0;
mddev->resync_max = MaxSector;
} else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
mddev->resync_min = mddev->curr_resync_completed;
mddev->curr_resync = 0;
wake_up(&resync_wait);
set_bit(MD_RECOVERY_DONE, &mddev->recovery);
md_wakeup_thread(mddev->thread);
return;
interrupted:
/*
* got a signal, exit.
*/
printk(KERN_INFO
"md: md_do_sync() got signal ... exiting\n");
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
goto out;
}
EXPORT_SYMBOL_GPL(md_do_sync);
static int remove_and_add_spares(struct mddev *mddev)
{
struct md_rdev *rdev;
int spares = 0;
int removed = 0;
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Blocked, &rdev->flags) &&
(test_bit(Faulty, &rdev->flags) ||
! test_bit(In_sync, &rdev->flags)) &&
atomic_read(&rdev->nr_pending)==0) {
if (mddev->pers->hot_remove_disk(
mddev, rdev) == 0) {
sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = -1;
removed++;
}
}
if (removed)
sysfs_notify(&mddev->kobj, NULL,
"degraded");
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk >= 0 &&
!test_bit(In_sync, &rdev->flags) &&
!test_bit(Faulty, &rdev->flags))
spares++;
if (rdev->raid_disk < 0
&& !test_bit(Faulty, &rdev->flags)) {
rdev->recovery_offset = 0;
if (mddev->pers->
hot_add_disk(mddev, rdev) == 0) {
if (sysfs_link_rdev(mddev, rdev))
/* failure here is OK */;
spares++;
md_new_event(mddev);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
}
}
}
if (removed)
set_bit(MD_CHANGE_DEVS, &mddev->flags);
return spares;
}
static void reap_sync_thread(struct mddev *mddev)
{
struct md_rdev *rdev;
/* resync has finished, collect result */
md_unregister_thread(&mddev->sync_thread);
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
/* success...*/
/* activate any spares */
if (mddev->pers->spare_active(mddev)) {
sysfs_notify(&mddev->kobj, NULL,
"degraded");
set_bit(MD_CHANGE_DEVS, &mddev->flags);
}
}
if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
mddev->pers->finish_reshape)
mddev->pers->finish_reshape(mddev);
/* If array is no-longer degraded, then any saved_raid_disk
* information must be scrapped. Also if any device is now
* In_sync we must scrape the saved_raid_disk for that device
* do the superblock for an incrementally recovered device
* written out.
*/
rdev_for_each(rdev, mddev)
if (!mddev->degraded ||
test_bit(In_sync, &rdev->flags))
rdev->saved_raid_disk = -1;
md_update_sb(mddev, 1);
clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
/* flag recovery needed just to double check */
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
sysfs_notify_dirent_safe(mddev->sysfs_action);
md_new_event(mddev);
if (mddev->event_work.func)
queue_work(md_misc_wq, &mddev->event_work);
}
/*
* This routine is regularly called by all per-raid-array threads to
* deal with generic issues like resync and super-block update.
* Raid personalities that don't have a thread (linear/raid0) do not
* need this as they never do any recovery or update the superblock.
*
* It does not do any resync itself, but rather "forks" off other threads
* to do that as needed.
* When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
* "->recovery" and create a thread at ->sync_thread.
* When the thread finishes it sets MD_RECOVERY_DONE
* and wakeups up this thread which will reap the thread and finish up.
* This thread also removes any faulty devices (with nr_pending == 0).
*
* The overall approach is:
* 1/ if the superblock needs updating, update it.
* 2/ If a recovery thread is running, don't do anything else.
* 3/ If recovery has finished, clean up, possibly marking spares active.
* 4/ If there are any faulty devices, remove them.
* 5/ If array is degraded, try to add spares devices
* 6/ If array has spares or is not in-sync, start a resync thread.
*/
void md_check_recovery(struct mddev *mddev)
{
if (mddev->suspended)
return;
if (mddev->bitmap)
bitmap_daemon_work(mddev);
if (signal_pending(current)) {
if (mddev->pers->sync_request && !mddev->external) {
printk(KERN_INFO "md: %s in immediate safe mode\n",
mdname(mddev));
mddev->safemode = 2;
}
flush_signals(current);
}
if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
return;
if ( ! (
(mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
(mddev->external == 0 && mddev->safemode == 1) ||
(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
&& !mddev->in_sync && mddev->recovery_cp == MaxSector)
))
return;
if (mddev_trylock(mddev)) {
int spares = 0;
if (mddev->ro) {
/* Only thing we do on a ro array is remove
* failed devices.
*/
struct md_rdev *rdev;
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Blocked, &rdev->flags) &&
test_bit(Faulty, &rdev->flags) &&
atomic_read(&rdev->nr_pending)==0) {
if (mddev->pers->hot_remove_disk(
mddev, rdev) == 0) {
sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = -1;
}
}
clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
goto unlock;
}
if (!mddev->external) {
int did_change = 0;
spin_lock_irq(&mddev->write_lock);
if (mddev->safemode &&
!atomic_read(&mddev->writes_pending) &&
!mddev->in_sync &&
mddev->recovery_cp == MaxSector) {
mddev->in_sync = 1;
did_change = 1;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
}
if (mddev->safemode == 1)
mddev->safemode = 0;
spin_unlock_irq(&mddev->write_lock);
if (did_change)
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
if (mddev->flags)
md_update_sb(mddev, 0);
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
/* resync/recovery still happening */
clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
goto unlock;
}
if (mddev->sync_thread) {
reap_sync_thread(mddev);
goto unlock;
}
/* Set RUNNING before clearing NEEDED to avoid
* any transients in the value of "sync_action".
*/
mddev->curr_resync_completed = 0;
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
/* Clear some bits that don't mean anything, but
* might be left set
*/
clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
goto unlock;
/* no recovery is running.
* remove any failed drives, then
* add spares if possible.
* Spares are also removed and re-added, to allow
* the personality to fail the re-add.
*/
if (mddev->reshape_position != MaxSector) {
if (mddev->pers->check_reshape == NULL ||
mddev->pers->check_reshape(mddev) != 0)
/* Cannot proceed */
goto unlock;
set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
} else if ((spares = remove_and_add_spares(mddev))) {
clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
} else if (mddev->recovery_cp < MaxSector) {
set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
} else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
/* nothing to be done ... */
goto unlock;
if (mddev->pers->sync_request) {
if (spares) {
/* We are adding a device or devices to an array
* which has the bitmap stored on all devices.
* So make sure all bitmap pages get written
*/
bitmap_write_all(mddev->bitmap);
}
mddev->sync_thread = md_register_thread(md_do_sync,
mddev,
"resync");
if (!mddev->sync_thread) {
printk(KERN_ERR "%s: could not start resync"
" thread...\n",
mdname(mddev));
/* leave the spares where they are, it shouldn't hurt */
clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
} else
md_wakeup_thread(mddev->sync_thread);
sysfs_notify_dirent_safe(mddev->sysfs_action);
md_new_event(mddev);
}
unlock:
if (!mddev->sync_thread) {
clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
if (test_and_clear_bit(MD_RECOVERY_RECOVER,
&mddev->recovery))
if (mddev->sysfs_action)
sysfs_notify_dirent_safe(mddev->sysfs_action);
}
mddev_unlock(mddev);
}
}
void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
{
sysfs_notify_dirent_safe(rdev->sysfs_state);
wait_event_timeout(rdev->blocked_wait,
!test_bit(Blocked, &rdev->flags) &&
!test_bit(BlockedBadBlocks, &rdev->flags),
msecs_to_jiffies(5000));
rdev_dec_pending(rdev, mddev);
}
EXPORT_SYMBOL(md_wait_for_blocked_rdev);
void md_finish_reshape(struct mddev *mddev)
{
/* called be personality module when reshape completes. */
struct md_rdev *rdev;
rdev_for_each(rdev, mddev) {
if (rdev->data_offset > rdev->new_data_offset)
rdev->sectors += rdev->data_offset - rdev->new_data_offset;
else
rdev->sectors -= rdev->new_data_offset - rdev->data_offset;
rdev->data_offset = rdev->new_data_offset;
}
}
EXPORT_SYMBOL(md_finish_reshape);
/* Bad block management.
* We can record which blocks on each device are 'bad' and so just
* fail those blocks, or that stripe, rather than the whole device.
* Entries in the bad-block table are 64bits wide. This comprises:
* Length of bad-range, in sectors: 0-511 for lengths 1-512
* Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
* A 'shift' can be set so that larger blocks are tracked and
* consequently larger devices can be covered.
* 'Acknowledged' flag - 1 bit. - the most significant bit.
*
* Locking of the bad-block table uses a seqlock so md_is_badblock
* might need to retry if it is very unlucky.
* We will sometimes want to check for bad blocks in a bi_end_io function,
* so we use the write_seqlock_irq variant.
*
* When looking for a bad block we specify a range and want to
* know if any block in the range is bad. So we binary-search
* to the last range that starts at-or-before the given endpoint,
* (or "before the sector after the target range")
* then see if it ends after the given start.
* We return
* 0 if there are no known bad blocks in the range
* 1 if there are known bad block which are all acknowledged
* -1 if there are bad blocks which have not yet been acknowledged in metadata.
* plus the start/length of the first bad section we overlap.
*/
int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
sector_t *first_bad, int *bad_sectors)
{
int hi;
int lo;
u64 *p = bb->page;
int rv;
sector_t target = s + sectors;
unsigned seq;
if (bb->shift > 0) {
/* round the start down, and the end up */
s >>= bb->shift;
target += (1<<bb->shift) - 1;
target >>= bb->shift;
sectors = target - s;
}
/* 'target' is now the first block after the bad range */
retry:
seq = read_seqbegin(&bb->lock);
lo = 0;
rv = 0;
hi = bb->count;
/* Binary search between lo and hi for 'target'
* i.e. for the last range that starts before 'target'
*/
/* INVARIANT: ranges before 'lo' and at-or-after 'hi'
* are known not to be the last range before target.
* VARIANT: hi-lo is the number of possible
* ranges, and decreases until it reaches 1
*/
while (hi - lo > 1) {
int mid = (lo + hi) / 2;
sector_t a = BB_OFFSET(p[mid]);
if (a < target)
/* This could still be the one, earlier ranges
* could not. */
lo = mid;
else
/* This and later ranges are definitely out. */
hi = mid;
}
/* 'lo' might be the last that started before target, but 'hi' isn't */
if (hi > lo) {
/* need to check all range that end after 's' to see if
* any are unacknowledged.
*/
while (lo >= 0 &&
BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
if (BB_OFFSET(p[lo]) < target) {
/* starts before the end, and finishes after
* the start, so they must overlap
*/
if (rv != -1 && BB_ACK(p[lo]))
rv = 1;
else
rv = -1;
*first_bad = BB_OFFSET(p[lo]);
*bad_sectors = BB_LEN(p[lo]);
}
lo--;
}
}
if (read_seqretry(&bb->lock, seq))
goto retry;
return rv;
}
EXPORT_SYMBOL_GPL(md_is_badblock);
/*
* Add a range of bad blocks to the table.
* This might extend the table, or might contract it
* if two adjacent ranges can be merged.
* We binary-search to find the 'insertion' point, then
* decide how best to handle it.
*/
static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
int acknowledged)
{
u64 *p;
int lo, hi;
int rv = 1;
if (bb->shift < 0)
/* badblocks are disabled */
return 0;
if (bb->shift) {
/* round the start down, and the end up */
sector_t next = s + sectors;
s >>= bb->shift;
next += (1<<bb->shift) - 1;
next >>= bb->shift;
sectors = next - s;
}
write_seqlock_irq(&bb->lock);
p = bb->page;
lo = 0;
hi = bb->count;
/* Find the last range that starts at-or-before 's' */
while (hi - lo > 1) {
int mid = (lo + hi) / 2;
sector_t a = BB_OFFSET(p[mid]);
if (a <= s)
lo = mid;
else
hi = mid;
}
if (hi > lo && BB_OFFSET(p[lo]) > s)
hi = lo;
if (hi > lo) {
/* we found a range that might merge with the start
* of our new range
*/
sector_t a = BB_OFFSET(p[lo]);
sector_t e = a + BB_LEN(p[lo]);
int ack = BB_ACK(p[lo]);
if (e >= s) {
/* Yes, we can merge with a previous range */
if (s == a && s + sectors >= e)
/* new range covers old */
ack = acknowledged;
else
ack = ack && acknowledged;
if (e < s + sectors)
e = s + sectors;
if (e - a <= BB_MAX_LEN) {
p[lo] = BB_MAKE(a, e-a, ack);
s = e;
} else {
/* does not all fit in one range,
* make p[lo] maximal
*/
if (BB_LEN(p[lo]) != BB_MAX_LEN)
p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
s = a + BB_MAX_LEN;
}
sectors = e - s;
}
}
if (sectors && hi < bb->count) {
/* 'hi' points to the first range that starts after 's'.
* Maybe we can merge with the start of that range */
sector_t a = BB_OFFSET(p[hi]);
sector_t e = a + BB_LEN(p[hi]);
int ack = BB_ACK(p[hi]);
if (a <= s + sectors) {
/* merging is possible */
if (e <= s + sectors) {
/* full overlap */
e = s + sectors;
ack = acknowledged;
} else
ack = ack && acknowledged;
a = s;
if (e - a <= BB_MAX_LEN) {
p[hi] = BB_MAKE(a, e-a, ack);
s = e;
} else {
p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
s = a + BB_MAX_LEN;
}
sectors = e - s;
lo = hi;
hi++;
}
}
if (sectors == 0 && hi < bb->count) {
/* we might be able to combine lo and hi */
/* Note: 's' is at the end of 'lo' */
sector_t a = BB_OFFSET(p[hi]);
int lolen = BB_LEN(p[lo]);
int hilen = BB_LEN(p[hi]);
int newlen = lolen + hilen - (s - a);
if (s >= a && newlen < BB_MAX_LEN) {
/* yes, we can combine them */
int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
memmove(p + hi, p + hi + 1,
(bb->count - hi - 1) * 8);
bb->count--;
}
}
while (sectors) {
/* didn't merge (it all).
* Need to add a range just before 'hi' */
if (bb->count >= MD_MAX_BADBLOCKS) {
/* No room for more */
rv = 0;
break;
} else {
int this_sectors = sectors;
memmove(p + hi + 1, p + hi,
(bb->count - hi) * 8);
bb->count++;
if (this_sectors > BB_MAX_LEN)
this_sectors = BB_MAX_LEN;
p[hi] = BB_MAKE(s, this_sectors, acknowledged);
sectors -= this_sectors;
s += this_sectors;
}
}
bb->changed = 1;
if (!acknowledged)
bb->unacked_exist = 1;
write_sequnlock_irq(&bb->lock);
return rv;
}
int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
int is_new)
{
int rv;
if (is_new)
s += rdev->new_data_offset;
else
s += rdev->data_offset;
rv = md_set_badblocks(&rdev->badblocks,
s, sectors, 0);
if (rv) {
/* Make sure they get written out promptly */
sysfs_notify_dirent_safe(rdev->sysfs_state);
set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
md_wakeup_thread(rdev->mddev->thread);
}
return rv;
}
EXPORT_SYMBOL_GPL(rdev_set_badblocks);
/*
* Remove a range of bad blocks from the table.
* This may involve extending the table if we spilt a region,
* but it must not fail. So if the table becomes full, we just
* drop the remove request.
*/
static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
{
u64 *p;
int lo, hi;
sector_t target = s + sectors;
int rv = 0;
if (bb->shift > 0) {
/* When clearing we round the start up and the end down.
* This should not matter as the shift should align with
* the block size and no rounding should ever be needed.
* However it is better the think a block is bad when it
* isn't than to think a block is not bad when it is.
*/
s += (1<<bb->shift) - 1;
s >>= bb->shift;
target >>= bb->shift;
sectors = target - s;
}
write_seqlock_irq(&bb->lock);
p = bb->page;
lo = 0;
hi = bb->count;
/* Find the last range that starts before 'target' */
while (hi - lo > 1) {
int mid = (lo + hi) / 2;
sector_t a = BB_OFFSET(p[mid]);
if (a < target)
lo = mid;
else
hi = mid;
}
if (hi > lo) {
/* p[lo] is the last range that could overlap the
* current range. Earlier ranges could also overlap,
* but only this one can overlap the end of the range.
*/
if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
/* Partial overlap, leave the tail of this range */
int ack = BB_ACK(p[lo]);
sector_t a = BB_OFFSET(p[lo]);
sector_t end = a + BB_LEN(p[lo]);
if (a < s) {
/* we need to split this range */
if (bb->count >= MD_MAX_BADBLOCKS) {
rv = 0;
goto out;
}
memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
bb->count++;
p[lo] = BB_MAKE(a, s-a, ack);
lo++;
}
p[lo] = BB_MAKE(target, end - target, ack);
/* there is no longer an overlap */
hi = lo;
lo--;
}
while (lo >= 0 &&
BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
/* This range does overlap */
if (BB_OFFSET(p[lo]) < s) {
/* Keep the early parts of this range. */
int ack = BB_ACK(p[lo]);
sector_t start = BB_OFFSET(p[lo]);
p[lo] = BB_MAKE(start, s - start, ack);
/* now low doesn't overlap, so.. */
break;
}
lo--;
}
/* 'lo' is strictly before, 'hi' is strictly after,
* anything between needs to be discarded
*/
if (hi - lo > 1) {
memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
bb->count -= (hi - lo - 1);
}
}
bb->changed = 1;
out:
write_sequnlock_irq(&bb->lock);
return rv;
}
int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
int is_new)
{
if (is_new)
s += rdev->new_data_offset;
else
s += rdev->data_offset;
return md_clear_badblocks(&rdev->badblocks,
s, sectors);
}
EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
/*
* Acknowledge all bad blocks in a list.
* This only succeeds if ->changed is clear. It is used by
* in-kernel metadata updates
*/
void md_ack_all_badblocks(struct badblocks *bb)
{
if (bb->page == NULL || bb->changed)
/* no point even trying */
return;
write_seqlock_irq(&bb->lock);
if (bb->changed == 0 && bb->unacked_exist) {
u64 *p = bb->page;
int i;
for (i = 0; i < bb->count ; i++) {
if (!BB_ACK(p[i])) {
sector_t start = BB_OFFSET(p[i]);
int len = BB_LEN(p[i]);
p[i] = BB_MAKE(start, len, 1);
}
}
bb->unacked_exist = 0;
}
write_sequnlock_irq(&bb->lock);
}
EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
/* sysfs access to bad-blocks list.
* We present two files.
* 'bad-blocks' lists sector numbers and lengths of ranges that
* are recorded as bad. The list is truncated to fit within
* the one-page limit of sysfs.
* Writing "sector length" to this file adds an acknowledged
* bad block list.
* 'unacknowledged-bad-blocks' lists bad blocks that have not yet
* been acknowledged. Writing to this file adds bad blocks
* without acknowledging them. This is largely for testing.
*/
static ssize_t
badblocks_show(struct badblocks *bb, char *page, int unack)
{
size_t len;
int i;
u64 *p = bb->page;
unsigned seq;
if (bb->shift < 0)
return 0;
retry:
seq = read_seqbegin(&bb->lock);
len = 0;
i = 0;
while (len < PAGE_SIZE && i < bb->count) {
sector_t s = BB_OFFSET(p[i]);
unsigned int length = BB_LEN(p[i]);
int ack = BB_ACK(p[i]);
i++;
if (unack && ack)
continue;
len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
(unsigned long long)s << bb->shift,
length << bb->shift);
}
if (unack && len == 0)
bb->unacked_exist = 0;
if (read_seqretry(&bb->lock, seq))
goto retry;
return len;
}
#define DO_DEBUG 1
static ssize_t
badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
{
unsigned long long sector;
int length;
char newline;
#ifdef DO_DEBUG
/* Allow clearing via sysfs *only* for testing/debugging.
* Normally only a successful write may clear a badblock
*/
int clear = 0;
if (page[0] == '-') {
clear = 1;
page++;
}
#endif /* DO_DEBUG */
switch (sscanf(page, "%llu %d%c", &sector, &length, &newline)) {
case 3:
if (newline != '\n')
return -EINVAL;
case 2:
if (length <= 0)
return -EINVAL;
break;
default:
return -EINVAL;
}
#ifdef DO_DEBUG
if (clear) {
md_clear_badblocks(bb, sector, length);
return len;
}
#endif /* DO_DEBUG */
if (md_set_badblocks(bb, sector, length, !unack))
return len;
else
return -ENOSPC;
}
static int md_notify_reboot(struct notifier_block *this,
unsigned long code, void *x)
{
struct list_head *tmp;
struct mddev *mddev;
int need_delay = 0;
for_each_mddev(mddev, tmp) {
if (mddev_trylock(mddev)) {
if (mddev->pers)
__md_stop_writes(mddev);
mddev->safemode = 2;
mddev_unlock(mddev);
}
need_delay = 1;
}
/*
* certain more exotic SCSI devices are known to be
* volatile wrt too early system reboots. While the
* right place to handle this issue is the given
* driver, we do want to have a safe RAID driver ...
*/
if (need_delay)
mdelay(1000*1);
return NOTIFY_DONE;
}
static struct notifier_block md_notifier = {
.notifier_call = md_notify_reboot,
.next = NULL,
.priority = INT_MAX, /* before any real devices */
};
static void md_geninit(void)
{
pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
}
static int __init md_init(void)
{
int ret = -ENOMEM;
md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
if (!md_wq)
goto err_wq;
md_misc_wq = alloc_workqueue("md_misc", 0, 0);
if (!md_misc_wq)
goto err_misc_wq;
if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
goto err_md;
if ((ret = register_blkdev(0, "mdp")) < 0)
goto err_mdp;
mdp_major = ret;
blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
md_probe, NULL, NULL);
blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
md_probe, NULL, NULL);
register_reboot_notifier(&md_notifier);
raid_table_header = register_sysctl_table(raid_root_table);
md_geninit();
return 0;
err_mdp:
unregister_blkdev(MD_MAJOR, "md");
err_md:
destroy_workqueue(md_misc_wq);
err_misc_wq:
destroy_workqueue(md_wq);
err_wq:
return ret;
}
#ifndef MODULE
/*
* Searches all registered partitions for autorun RAID arrays
* at boot time.
*/
static LIST_HEAD(all_detected_devices);
struct detected_devices_node {
struct list_head list;
dev_t dev;
};
void md_autodetect_dev(dev_t dev)
{
struct detected_devices_node *node_detected_dev;
node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
if (node_detected_dev) {
node_detected_dev->dev = dev;
list_add_tail(&node_detected_dev->list, &all_detected_devices);
} else {
printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
}
}
static void autostart_arrays(int part)
{
struct md_rdev *rdev;
struct detected_devices_node *node_detected_dev;
dev_t dev;
int i_scanned, i_passed;
i_scanned = 0;
i_passed = 0;
printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
i_scanned++;
node_detected_dev = list_entry(all_detected_devices.next,
struct detected_devices_node, list);
list_del(&node_detected_dev->list);
dev = node_detected_dev->dev;
kfree(node_detected_dev);
rdev = md_import_device(dev,0, 90);
if (IS_ERR(rdev))
continue;
if (test_bit(Faulty, &rdev->flags)) {
MD_BUG();
continue;
}
set_bit(AutoDetected, &rdev->flags);
list_add(&rdev->same_set, &pending_raid_disks);
i_passed++;
}
printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
i_scanned, i_passed);
autorun_devices(part);
}
#endif /* !MODULE */
static __exit void md_exit(void)
{
struct mddev *mddev;
struct list_head *tmp;
blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
unregister_blkdev(MD_MAJOR,"md");
unregister_blkdev(mdp_major, "mdp");
unregister_reboot_notifier(&md_notifier);
unregister_sysctl_table(raid_table_header);
remove_proc_entry("mdstat", NULL);
for_each_mddev(mddev, tmp) {
export_array(mddev);
mddev->hold_active = 0;
}
destroy_workqueue(md_misc_wq);
destroy_workqueue(md_wq);
}
subsys_initcall(md_init);
module_exit(md_exit)
static int get_ro(char *buffer, struct kernel_param *kp)
{
return sprintf(buffer, "%d", start_readonly);
}
static int set_ro(const char *val, struct kernel_param *kp)
{
char *e;
int num = simple_strtoul(val, &e, 10);
if (*val && (*e == '\0' || *e == '\n')) {
start_readonly = num;
return 0;
}
return -EINVAL;
}
module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
EXPORT_SYMBOL(register_md_personality);
EXPORT_SYMBOL(unregister_md_personality);
EXPORT_SYMBOL(md_error);
EXPORT_SYMBOL(md_done_sync);
EXPORT_SYMBOL(md_write_start);
EXPORT_SYMBOL(md_write_end);
EXPORT_SYMBOL(md_register_thread);
EXPORT_SYMBOL(md_unregister_thread);
EXPORT_SYMBOL(md_wakeup_thread);
EXPORT_SYMBOL(md_check_recovery);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MD RAID framework");
MODULE_ALIAS("md");
MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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