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btrfs: add readonly flag 

setting the readonly flag prevents writes in case an error is detected

Signed-off-by: Arne Jansen <sensille@gmx.net>
This commit is contained in:
Arne Jansen 2011-03-23 16:34:19 +01:00
parent 96e369208e
commit 8628764e1a
4 changed files with 16 additions and 12 deletions
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2
fs/btrfs/ctree.h
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@ -2657,7 +2657,7 @@ void btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
/* scrub.c */ /* scrub.c */
int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end, int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
struct btrfs_scrub_progress *progress); struct btrfs_scrub_progress *progress, int readonly);
int btrfs_scrub_pause(struct btrfs_root *root); int btrfs_scrub_pause(struct btrfs_root *root);
int btrfs_scrub_pause_super(struct btrfs_root *root); int btrfs_scrub_pause_super(struct btrfs_root *root);
int btrfs_scrub_continue(struct btrfs_root *root); int btrfs_scrub_continue(struct btrfs_root *root);

2
fs/btrfs/ioctl.c
View File

@ -2547,7 +2547,7 @@ static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg)
return PTR_ERR(sa); return PTR_ERR(sa);
ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end,
&sa->progress); &sa->progress, sa->flags & BTRFS_SCRUB_READONLY);
if (copy_to_user(arg, sa, sizeof(*sa))) if (copy_to_user(arg, sa, sizeof(*sa)))
ret = -EFAULT; ret = -EFAULT;

1
fs/btrfs/ioctl.h
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@ -81,6 +81,7 @@ struct btrfs_scrub_progress {
* Intermittent error. */ * Intermittent error. */
}; };
#define BTRFS_SCRUB_READONLY 1
struct btrfs_ioctl_scrub_args { struct btrfs_ioctl_scrub_args {
__u64 devid; /* in */ __u64 devid; /* in */
__u64 start; /* in */ __u64 start; /* in */

7
fs/btrfs/scrub.c
View File

@ -42,7 +42,6 @@
* - In case of a read error on files with nodatasum, map the file and read * - In case of a read error on files with nodatasum, map the file and read
* the extent to trigger a writeback of the good copy * the extent to trigger a writeback of the good copy
* - track and record media errors, throw out bad devices * - track and record media errors, throw out bad devices
* - add a readonly mode
* - add a mode to also read unallocated space * - add a mode to also read unallocated space
* - make the prefetch cancellable * - make the prefetch cancellable
*/ */
@ -99,6 +98,7 @@ struct scrub_dev {
u16 csum_size; u16 csum_size;
struct list_head csum_list; struct list_head csum_list;
atomic_t cancel_req; atomic_t cancel_req;
int readonly;
/* /*
* statistics * statistics
*/ */
@ -329,6 +329,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
if (i == multi->num_stripes) if (i == multi->num_stripes)
goto uncorrectable; goto uncorrectable;
if (!sdev->readonly) {
/* /*
* bi_io_vec[ix].bv_page now contains good data, write it back * bi_io_vec[ix].bv_page now contains good data, write it back
*/ */
@ -338,6 +339,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
/* I/O-error, writeback failed, give up */ /* I/O-error, writeback failed, give up */
goto uncorrectable; goto uncorrectable;
} }
}
kfree(multi); kfree(multi);
spin_lock(&sdev->stat_lock); spin_lock(&sdev->stat_lock);
@ -1156,7 +1158,7 @@ static noinline_for_stack void scrub_workers_put(struct btrfs_root *root)
int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end, int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
struct btrfs_scrub_progress *progress) struct btrfs_scrub_progress *progress, int readonly)
{ {
struct scrub_dev *sdev; struct scrub_dev *sdev;
struct btrfs_fs_info *fs_info = root->fs_info; struct btrfs_fs_info *fs_info = root->fs_info;
@ -1209,6 +1211,7 @@ int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
scrub_workers_put(root); scrub_workers_put(root);
return PTR_ERR(sdev); return PTR_ERR(sdev);
} }
sdev->readonly = readonly;
dev->scrub_device = sdev; dev->scrub_device = sdev;
atomic_inc(&fs_info->scrubs_running); atomic_inc(&fs_info->scrubs_running);