linux/fs/nfs/objlayout/objio_osd.c

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/*
* pNFS Objects layout implementation over open-osd initiator library
*
* Copyright (C) 2009 Panasas Inc. [year of first publication]
* All rights reserved.
*
* Benny Halevy <bhalevy@panasas.com>
* Boaz Harrosh <bharrosh@panasas.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* See the file COPYING included with this distribution for more details.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Panasas company nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/module.h>
#include <scsi/osd_initiator.h>
#include "objlayout.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
#define _LLU(x) ((unsigned long long)x)
enum { BIO_MAX_PAGES_KMALLOC =
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
};
struct objio_dev_ent {
struct nfs4_deviceid_node id_node;
struct osd_dev *od;
};
static void
objio_free_deviceid_node(struct nfs4_deviceid_node *d)
{
struct objio_dev_ent *de = container_of(d, struct objio_dev_ent, id_node);
dprintk("%s: free od=%p\n", __func__, de->od);
osduld_put_device(de->od);
kfree(de);
}
static struct objio_dev_ent *_dev_list_find(const struct nfs_server *nfss,
const struct nfs4_deviceid *d_id)
{
struct nfs4_deviceid_node *d;
struct objio_dev_ent *de;
d = nfs4_find_get_deviceid(nfss->pnfs_curr_ld, nfss->nfs_client, d_id);
if (!d)
return NULL;
de = container_of(d, struct objio_dev_ent, id_node);
return de;
}
static struct objio_dev_ent *
_dev_list_add(const struct nfs_server *nfss,
const struct nfs4_deviceid *d_id, struct osd_dev *od,
gfp_t gfp_flags)
{
struct nfs4_deviceid_node *d;
struct objio_dev_ent *de = kzalloc(sizeof(*de), gfp_flags);
struct objio_dev_ent *n;
if (!de) {
dprintk("%s: -ENOMEM od=%p\n", __func__, od);
return NULL;
}
dprintk("%s: Adding od=%p\n", __func__, od);
nfs4_init_deviceid_node(&de->id_node,
nfss->pnfs_curr_ld,
nfss->nfs_client,
d_id);
de->od = od;
d = nfs4_insert_deviceid_node(&de->id_node);
n = container_of(d, struct objio_dev_ent, id_node);
if (n != de) {
dprintk("%s: Race with other n->od=%p\n", __func__, n->od);
objio_free_deviceid_node(&de->id_node);
de = n;
}
return de;
}
struct caps_buffers {
u8 caps_key[OSD_CRYPTO_KEYID_SIZE];
u8 creds[OSD_CAP_LEN];
};
struct objio_segment {
struct pnfs_layout_segment lseg;
struct pnfs_osd_object_cred *comps;
unsigned mirrors_p1;
unsigned stripe_unit;
unsigned group_width; /* Data stripe_units without integrity comps */
u64 group_depth;
unsigned group_count;
unsigned max_io_size;
unsigned comps_index;
unsigned num_comps;
/* variable length */
struct objio_dev_ent *ods[];
};
static inline struct objio_segment *
OBJIO_LSEG(struct pnfs_layout_segment *lseg)
{
return container_of(lseg, struct objio_segment, lseg);
}
struct objio_state;
typedef ssize_t (*objio_done_fn)(struct objio_state *ios);
struct objio_state {
/* Generic layer */
struct objlayout_io_state ol_state;
struct objio_segment *layout;
struct kref kref;
objio_done_fn done;
void *private;
unsigned long length;
unsigned numdevs; /* Actually used devs in this IO */
/* A per-device variable array of size numdevs */
struct _objio_per_comp {
struct bio *bio;
struct osd_request *or;
unsigned long length;
u64 offset;
unsigned dev;
} per_dev[];
};
/* Send and wait for a get_device_info of devices in the layout,
then look them up with the osd_initiator library */
static struct objio_dev_ent *_device_lookup(struct pnfs_layout_hdr *pnfslay,
struct objio_segment *objio_seg, unsigned comp,
gfp_t gfp_flags)
{
struct pnfs_osd_deviceaddr *deviceaddr;
struct nfs4_deviceid *d_id;
struct objio_dev_ent *ode;
struct osd_dev *od;
struct osd_dev_info odi;
int err;
d_id = &objio_seg->comps[comp].oc_object_id.oid_device_id;
ode = _dev_list_find(NFS_SERVER(pnfslay->plh_inode), d_id);
if (ode)
return ode;
err = objlayout_get_deviceinfo(pnfslay, d_id, &deviceaddr, gfp_flags);
if (unlikely(err)) {
dprintk("%s: objlayout_get_deviceinfo dev(%llx:%llx) =>%d\n",
__func__, _DEVID_LO(d_id), _DEVID_HI(d_id), err);
return ERR_PTR(err);
}
odi.systemid_len = deviceaddr->oda_systemid.len;
if (odi.systemid_len > sizeof(odi.systemid)) {
err = -EINVAL;
goto out;
} else if (odi.systemid_len)
memcpy(odi.systemid, deviceaddr->oda_systemid.data,
odi.systemid_len);
odi.osdname_len = deviceaddr->oda_osdname.len;
odi.osdname = (u8 *)deviceaddr->oda_osdname.data;
if (!odi.osdname_len && !odi.systemid_len) {
dprintk("%s: !odi.osdname_len && !odi.systemid_len\n",
__func__);
err = -ENODEV;
goto out;
}
od = osduld_info_lookup(&odi);
if (unlikely(IS_ERR(od))) {
err = PTR_ERR(od);
dprintk("%s: osduld_info_lookup => %d\n", __func__, err);
goto out;
}
ode = _dev_list_add(NFS_SERVER(pnfslay->plh_inode), d_id, od,
gfp_flags);
out:
dprintk("%s: return=%d\n", __func__, err);
objlayout_put_deviceinfo(deviceaddr);
return err ? ERR_PTR(err) : ode;
}
static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay,
struct objio_segment *objio_seg,
gfp_t gfp_flags)
{
unsigned i;
int err;
/* lookup all devices */
for (i = 0; i < objio_seg->num_comps; i++) {
struct objio_dev_ent *ode;
ode = _device_lookup(pnfslay, objio_seg, i, gfp_flags);
if (unlikely(IS_ERR(ode))) {
err = PTR_ERR(ode);
goto out;
}
objio_seg->ods[i] = ode;
}
err = 0;
out:
dprintk("%s: return=%d\n", __func__, err);
return err;
}
static int _verify_data_map(struct pnfs_osd_layout *layout)
{
struct pnfs_osd_data_map *data_map = &layout->olo_map;
u64 stripe_length;
u32 group_width;
/* FIXME: Only raid0 for now. if not go through MDS */
if (data_map->odm_raid_algorithm != PNFS_OSD_RAID_0) {
printk(KERN_ERR "Only RAID_0 for now\n");
return -ENOTSUPP;
}
if (0 != (data_map->odm_num_comps % (data_map->odm_mirror_cnt + 1))) {
printk(KERN_ERR "Data Map wrong, num_comps=%u mirrors=%u\n",
data_map->odm_num_comps, data_map->odm_mirror_cnt);
return -EINVAL;
}
if (data_map->odm_group_width)
group_width = data_map->odm_group_width;
else
group_width = data_map->odm_num_comps /
(data_map->odm_mirror_cnt + 1);
stripe_length = (u64)data_map->odm_stripe_unit * group_width;
if (stripe_length >= (1ULL << 32)) {
printk(KERN_ERR "Total Stripe length(0x%llx)"
" >= 32bit is not supported\n", _LLU(stripe_length));
return -ENOTSUPP;
}
if (0 != (data_map->odm_stripe_unit & ~PAGE_MASK)) {
printk(KERN_ERR "Stripe Unit(0x%llx)"
" must be Multples of PAGE_SIZE(0x%lx)\n",
_LLU(data_map->odm_stripe_unit), PAGE_SIZE);
return -ENOTSUPP;
}
return 0;
}
static void copy_single_comp(struct pnfs_osd_object_cred *cur_comp,
struct pnfs_osd_object_cred *src_comp,
struct caps_buffers *caps_p)
{
WARN_ON(src_comp->oc_cap_key.cred_len > sizeof(caps_p->caps_key));
WARN_ON(src_comp->oc_cap.cred_len > sizeof(caps_p->creds));
*cur_comp = *src_comp;
memcpy(caps_p->caps_key, src_comp->oc_cap_key.cred,
sizeof(caps_p->caps_key));
cur_comp->oc_cap_key.cred = caps_p->caps_key;
memcpy(caps_p->creds, src_comp->oc_cap.cred,
sizeof(caps_p->creds));
cur_comp->oc_cap.cred = caps_p->creds;
}
int objio_alloc_lseg(struct pnfs_layout_segment **outp,
struct pnfs_layout_hdr *pnfslay,
struct pnfs_layout_range *range,
struct xdr_stream *xdr,
gfp_t gfp_flags)
{
struct objio_segment *objio_seg;
struct pnfs_osd_xdr_decode_layout_iter iter;
struct pnfs_osd_layout layout;
struct pnfs_osd_object_cred *cur_comp, src_comp;
struct caps_buffers *caps_p;
int err;
err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
if (unlikely(err))
return err;
err = _verify_data_map(&layout);
if (unlikely(err))
return err;
objio_seg = kzalloc(sizeof(*objio_seg) +
sizeof(objio_seg->ods[0]) * layout.olo_num_comps +
sizeof(*objio_seg->comps) * layout.olo_num_comps +
sizeof(struct caps_buffers) * layout.olo_num_comps,
gfp_flags);
if (!objio_seg)
return -ENOMEM;
objio_seg->comps = (void *)(objio_seg->ods + layout.olo_num_comps);
cur_comp = objio_seg->comps;
caps_p = (void *)(cur_comp + layout.olo_num_comps);
while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err))
copy_single_comp(cur_comp++, &src_comp, caps_p++);
if (unlikely(err))
goto err;
objio_seg->num_comps = layout.olo_num_comps;
objio_seg->comps_index = layout.olo_comps_index;
err = objio_devices_lookup(pnfslay, objio_seg, gfp_flags);
if (err)
goto err;
objio_seg->mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
objio_seg->stripe_unit = layout.olo_map.odm_stripe_unit;
if (layout.olo_map.odm_group_width) {
objio_seg->group_width = layout.olo_map.odm_group_width;
objio_seg->group_depth = layout.olo_map.odm_group_depth;
objio_seg->group_count = layout.olo_map.odm_num_comps /
objio_seg->mirrors_p1 /
objio_seg->group_width;
} else {
objio_seg->group_width = layout.olo_map.odm_num_comps /
objio_seg->mirrors_p1;
objio_seg->group_depth = -1;
objio_seg->group_count = 1;
}
/* Cache this calculation it will hit for every page */
objio_seg->max_io_size = (BIO_MAX_PAGES_KMALLOC * PAGE_SIZE -
objio_seg->stripe_unit) *
objio_seg->group_width;
*outp = &objio_seg->lseg;
return 0;
err:
kfree(objio_seg);
dprintk("%s: Error: return %d\n", __func__, err);
*outp = NULL;
return err;
}
void objio_free_lseg(struct pnfs_layout_segment *lseg)
{
int i;
struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
for (i = 0; i < objio_seg->num_comps; i++) {
if (!objio_seg->ods[i])
break;
nfs4_put_deviceid_node(&objio_seg->ods[i]->id_node);
}
kfree(objio_seg);
}
int objio_alloc_io_state(struct pnfs_layout_segment *lseg,
struct objlayout_io_state **outp,
gfp_t gfp_flags)
{
struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
struct objio_state *ios;
const unsigned first_size = sizeof(*ios) +
objio_seg->num_comps * sizeof(ios->per_dev[0]);
const unsigned sec_size = objio_seg->num_comps *
sizeof(ios->ol_state.ioerrs[0]);
ios = kzalloc(first_size + sec_size, gfp_flags);
if (unlikely(!ios))
return -ENOMEM;
ios->layout = objio_seg;
ios->ol_state.ioerrs = ((void *)ios) + first_size;
ios->ol_state.num_comps = objio_seg->num_comps;
*outp = &ios->ol_state;
return 0;
}
void objio_free_io_state(struct objlayout_io_state *ol_state)
{
struct objio_state *ios = container_of(ol_state, struct objio_state,
ol_state);
kfree(ios);
}
enum pnfs_osd_errno osd_pri_2_pnfs_err(enum osd_err_priority oep)
{
switch (oep) {
case OSD_ERR_PRI_NO_ERROR:
return (enum pnfs_osd_errno)0;
case OSD_ERR_PRI_CLEAR_PAGES:
BUG_ON(1);
return 0;
case OSD_ERR_PRI_RESOURCE:
return PNFS_OSD_ERR_RESOURCE;
case OSD_ERR_PRI_BAD_CRED:
return PNFS_OSD_ERR_BAD_CRED;
case OSD_ERR_PRI_NO_ACCESS:
return PNFS_OSD_ERR_NO_ACCESS;
case OSD_ERR_PRI_UNREACHABLE:
return PNFS_OSD_ERR_UNREACHABLE;
case OSD_ERR_PRI_NOT_FOUND:
return PNFS_OSD_ERR_NOT_FOUND;
case OSD_ERR_PRI_NO_SPACE:
return PNFS_OSD_ERR_NO_SPACE;
default:
WARN_ON(1);
/* fallthrough */
case OSD_ERR_PRI_EIO:
return PNFS_OSD_ERR_EIO;
}
}
static void _clear_bio(struct bio *bio)
{
struct bio_vec *bv;
unsigned i;
__bio_for_each_segment(bv, bio, i, 0) {
unsigned this_count = bv->bv_len;
if (likely(PAGE_SIZE == this_count))
clear_highpage(bv->bv_page);
else
zero_user(bv->bv_page, bv->bv_offset, this_count);
}
}
static int _io_check(struct objio_state *ios, bool is_write)
{
enum osd_err_priority oep = OSD_ERR_PRI_NO_ERROR;
int lin_ret = 0;
int i;
for (i = 0; i < ios->numdevs; i++) {
struct osd_sense_info osi;
struct osd_request *or = ios->per_dev[i].or;
unsigned dev;
int ret;
if (!or)
continue;
ret = osd_req_decode_sense(or, &osi);
if (likely(!ret))
continue;
if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
/* start read offset passed endof file */
BUG_ON(is_write);
_clear_bio(ios->per_dev[i].bio);
dprintk("%s: start read offset passed end of file "
"offset=0x%llx, length=0x%lx\n", __func__,
_LLU(ios->per_dev[i].offset),
ios->per_dev[i].length);
continue; /* we recovered */
}
dev = ios->per_dev[i].dev;
objlayout_io_set_result(&ios->ol_state, dev,
&ios->layout->comps[dev].oc_object_id,
osd_pri_2_pnfs_err(osi.osd_err_pri),
ios->per_dev[i].offset,
ios->per_dev[i].length,
is_write);
if (osi.osd_err_pri >= oep) {
oep = osi.osd_err_pri;
lin_ret = ret;
}
}
return lin_ret;
}
/*
* Common IO state helpers.
*/
static void _io_free(struct objio_state *ios)
{
unsigned i;
for (i = 0; i < ios->numdevs; i++) {
struct _objio_per_comp *per_dev = &ios->per_dev[i];
if (per_dev->or) {
osd_end_request(per_dev->or);
per_dev->or = NULL;
}
if (per_dev->bio) {
bio_put(per_dev->bio);
per_dev->bio = NULL;
}
}
}
struct osd_dev *_io_od(struct objio_state *ios, unsigned dev)
{
unsigned min_dev = ios->layout->comps_index;
unsigned max_dev = min_dev + ios->layout->num_comps;
BUG_ON(dev < min_dev || max_dev <= dev);
return ios->layout->ods[dev - min_dev]->od;
}
struct _striping_info {
u64 obj_offset;
u64 group_length;
unsigned dev;
unsigned unit_off;
};
static void _calc_stripe_info(struct objio_state *ios, u64 file_offset,
struct _striping_info *si)
{
u32 stripe_unit = ios->layout->stripe_unit;
u32 group_width = ios->layout->group_width;
u64 group_depth = ios->layout->group_depth;
u32 U = stripe_unit * group_width;
u64 T = U * group_depth;
u64 S = T * ios->layout->group_count;
u64 M = div64_u64(file_offset, S);
/*
G = (L - (M * S)) / T
H = (L - (M * S)) % T
*/
u64 LmodU = file_offset - M * S;
u32 G = div64_u64(LmodU, T);
u64 H = LmodU - G * T;
u32 N = div_u64(H, U);
div_u64_rem(file_offset, stripe_unit, &si->unit_off);
si->obj_offset = si->unit_off + (N * stripe_unit) +
(M * group_depth * stripe_unit);
/* "H - (N * U)" is just "H % U" so it's bound to u32 */
si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
si->dev *= ios->layout->mirrors_p1;
si->group_length = T - H;
}
static int _add_stripe_unit(struct objio_state *ios, unsigned *cur_pg,
unsigned pgbase, struct _objio_per_comp *per_dev, int cur_len,
gfp_t gfp_flags)
{
unsigned pg = *cur_pg;
struct request_queue *q =
osd_request_queue(_io_od(ios, per_dev->dev));
per_dev->length += cur_len;
if (per_dev->bio == NULL) {
unsigned stripes = ios->layout->num_comps /
ios->layout->mirrors_p1;
unsigned pages_in_stripe = stripes *
(ios->layout->stripe_unit / PAGE_SIZE);
unsigned bio_size = (ios->ol_state.nr_pages + pages_in_stripe) /
stripes;
if (BIO_MAX_PAGES_KMALLOC < bio_size)
bio_size = BIO_MAX_PAGES_KMALLOC;
per_dev->bio = bio_kmalloc(gfp_flags, bio_size);
if (unlikely(!per_dev->bio)) {
dprintk("Faild to allocate BIO size=%u\n", bio_size);
return -ENOMEM;
}
}
while (cur_len > 0) {
unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
unsigned added_len;
BUG_ON(ios->ol_state.nr_pages <= pg);
cur_len -= pglen;
added_len = bio_add_pc_page(q, per_dev->bio,
ios->ol_state.pages[pg], pglen, pgbase);
if (unlikely(pglen != added_len))
return -ENOMEM;
pgbase = 0;
++pg;
}
BUG_ON(cur_len);
*cur_pg = pg;
return 0;
}
static int _prepare_one_group(struct objio_state *ios, u64 length,
struct _striping_info *si, unsigned *last_pg,
gfp_t gfp_flags)
{
unsigned stripe_unit = ios->layout->stripe_unit;
unsigned mirrors_p1 = ios->layout->mirrors_p1;
unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
unsigned dev = si->dev;
unsigned first_dev = dev - (dev % devs_in_group);
unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
unsigned cur_pg = *last_pg;
int ret = 0;
while (length) {
struct _objio_per_comp *per_dev = &ios->per_dev[dev];
unsigned cur_len, page_off = 0;
if (!per_dev->length) {
per_dev->dev = dev;
if (dev < si->dev) {
per_dev->offset = si->obj_offset + stripe_unit -
si->unit_off;
cur_len = stripe_unit;
} else if (dev == si->dev) {
per_dev->offset = si->obj_offset;
cur_len = stripe_unit - si->unit_off;
page_off = si->unit_off & ~PAGE_MASK;
BUG_ON(page_off &&
(page_off != ios->ol_state.pgbase));
} else { /* dev > si->dev */
per_dev->offset = si->obj_offset - si->unit_off;
cur_len = stripe_unit;
}
if (max_comp < dev)
max_comp = dev;
} else {
cur_len = stripe_unit;
}
if (cur_len >= length)
cur_len = length;
ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
cur_len, gfp_flags);
if (unlikely(ret))
goto out;
dev += mirrors_p1;
dev = (dev % devs_in_group) + first_dev;
length -= cur_len;
ios->length += cur_len;
}
out:
ios->numdevs = max_comp + mirrors_p1;
*last_pg = cur_pg;
return ret;
}
static int _io_rw_pagelist(struct objio_state *ios, gfp_t gfp_flags)
{
u64 length = ios->ol_state.count;
u64 offset = ios->ol_state.offset;
struct _striping_info si;
unsigned last_pg = 0;
int ret = 0;
while (length) {
_calc_stripe_info(ios, offset, &si);
if (length < si.group_length)
si.group_length = length;
ret = _prepare_one_group(ios, si.group_length, &si, &last_pg, gfp_flags);
if (unlikely(ret))
goto out;
offset += si.group_length;
length -= si.group_length;
}
out:
if (!ios->length)
return ret;
return 0;
}
static ssize_t _sync_done(struct objio_state *ios)
{
struct completion *waiting = ios->private;
complete(waiting);
return 0;
}
static void _last_io(struct kref *kref)
{
struct objio_state *ios = container_of(kref, struct objio_state, kref);
ios->done(ios);
}
static void _done_io(struct osd_request *or, void *p)
{
struct objio_state *ios = p;
kref_put(&ios->kref, _last_io);
}
static ssize_t _io_exec(struct objio_state *ios)
{
DECLARE_COMPLETION_ONSTACK(wait);
ssize_t status = 0; /* sync status */
unsigned i;
objio_done_fn saved_done_fn = ios->done;
bool sync = ios->ol_state.sync;
if (sync) {
ios->done = _sync_done;
ios->private = &wait;
}
kref_init(&ios->kref);
for (i = 0; i < ios->numdevs; i++) {
struct osd_request *or = ios->per_dev[i].or;
if (!or)
continue;
kref_get(&ios->kref);
osd_execute_request_async(or, _done_io, ios);
}
kref_put(&ios->kref, _last_io);
if (sync) {
wait_for_completion(&wait);
status = saved_done_fn(ios);
}
return status;
}
/*
* read
*/
static ssize_t _read_done(struct objio_state *ios)
{
ssize_t status;
int ret = _io_check(ios, false);
_io_free(ios);
if (likely(!ret))
status = ios->length;
else
status = ret;
objlayout_read_done(&ios->ol_state, status, ios->ol_state.sync);
return status;
}
static int _read_mirrors(struct objio_state *ios, unsigned cur_comp)
{
struct osd_request *or = NULL;
struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
unsigned dev = per_dev->dev;
struct pnfs_osd_object_cred *cred =
&ios->layout->comps[dev];
struct osd_obj_id obj = {
.partition = cred->oc_object_id.oid_partition_id,
.id = cred->oc_object_id.oid_object_id,
};
int ret;
or = osd_start_request(_io_od(ios, dev), GFP_KERNEL);
if (unlikely(!or)) {
ret = -ENOMEM;
goto err;
}
per_dev->or = or;
osd_req_read(or, &obj, per_dev->offset, per_dev->bio, per_dev->length);
ret = osd_finalize_request(or, 0, cred->oc_cap.cred, NULL);
if (ret) {
dprintk("%s: Faild to osd_finalize_request() => %d\n",
__func__, ret);
goto err;
}
dprintk("%s:[%d] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
__func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
per_dev->length);
err:
return ret;
}
static ssize_t _read_exec(struct objio_state *ios)
{
unsigned i;
int ret;
for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
if (!ios->per_dev[i].length)
continue;
ret = _read_mirrors(ios, i);
if (unlikely(ret))
goto err;
}
ios->done = _read_done;
return _io_exec(ios); /* In sync mode exec returns the io status */
err:
_io_free(ios);
return ret;
}
ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state)
{
struct objio_state *ios = container_of(ol_state, struct objio_state,
ol_state);
int ret;
ret = _io_rw_pagelist(ios, GFP_KERNEL);
if (unlikely(ret))
return ret;
return _read_exec(ios);
}
/*
* write
*/
static ssize_t _write_done(struct objio_state *ios)
{
ssize_t status;
int ret = _io_check(ios, true);
_io_free(ios);
if (likely(!ret)) {
/* FIXME: should be based on the OSD's persistence model
* See OSD2r05 Section 4.13 Data persistence model */
ios->ol_state.committed = NFS_FILE_SYNC;
status = ios->length;
} else {
status = ret;
}
objlayout_write_done(&ios->ol_state, status, ios->ol_state.sync);
return status;
}
static int _write_mirrors(struct objio_state *ios, unsigned cur_comp)
{
struct _objio_per_comp *master_dev = &ios->per_dev[cur_comp];
unsigned dev = ios->per_dev[cur_comp].dev;
unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
int ret;
for (; cur_comp < last_comp; ++cur_comp, ++dev) {
struct osd_request *or = NULL;
struct pnfs_osd_object_cred *cred =
&ios->layout->comps[dev];
struct osd_obj_id obj = {
.partition = cred->oc_object_id.oid_partition_id,
.id = cred->oc_object_id.oid_object_id,
};
struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
struct bio *bio;
or = osd_start_request(_io_od(ios, dev), GFP_NOFS);
if (unlikely(!or)) {
ret = -ENOMEM;
goto err;
}
per_dev->or = or;
if (per_dev != master_dev) {
bio = bio_kmalloc(GFP_NOFS,
master_dev->bio->bi_max_vecs);
if (unlikely(!bio)) {
dprintk("Faild to allocate BIO size=%u\n",
master_dev->bio->bi_max_vecs);
ret = -ENOMEM;
goto err;
}
__bio_clone(bio, master_dev->bio);
bio->bi_bdev = NULL;
bio->bi_next = NULL;
per_dev->bio = bio;
per_dev->dev = dev;
per_dev->length = master_dev->length;
per_dev->offset = master_dev->offset;
} else {
bio = master_dev->bio;
bio->bi_rw |= REQ_WRITE;
}
osd_req_write(or, &obj, per_dev->offset, bio, per_dev->length);
ret = osd_finalize_request(or, 0, cred->oc_cap.cred, NULL);
if (ret) {
dprintk("%s: Faild to osd_finalize_request() => %d\n",
__func__, ret);
goto err;
}
dprintk("%s:[%d] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
__func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
per_dev->length);
}
err:
return ret;
}
static ssize_t _write_exec(struct objio_state *ios)
{
unsigned i;
int ret;
for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
if (!ios->per_dev[i].length)
continue;
ret = _write_mirrors(ios, i);
if (unlikely(ret))
goto err;
}
ios->done = _write_done;
return _io_exec(ios); /* In sync mode exec returns the io->status */
err:
_io_free(ios);
return ret;
}
ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, bool stable)
{
struct objio_state *ios = container_of(ol_state, struct objio_state,
ol_state);
int ret;
/* TODO: ios->stable = stable; */
ret = _io_rw_pagelist(ios, GFP_NOFS);
if (unlikely(ret))
return ret;
return _write_exec(ios);
}
static bool objio_pg_test(struct nfs_pageio_descriptor *pgio,
struct nfs_page *prev, struct nfs_page *req)
{
if (!pnfs_generic_pg_test(pgio, prev, req))
return false;
return pgio->pg_count + req->wb_bytes <=
OBJIO_LSEG(pgio->pg_lseg)->max_io_size;
}
static const struct nfs_pageio_ops objio_pg_read_ops = {
.pg_init = pnfs_generic_pg_init_read,
.pg_test = objio_pg_test,
.pg_doio = pnfs_generic_pg_readpages,
};
static const struct nfs_pageio_ops objio_pg_write_ops = {
.pg_init = pnfs_generic_pg_init_write,
.pg_test = objio_pg_test,
.pg_doio = pnfs_generic_pg_writepages,
};
static struct pnfs_layoutdriver_type objlayout_type = {
.id = LAYOUT_OSD2_OBJECTS,
.name = "LAYOUT_OSD2_OBJECTS",
.flags = PNFS_LAYOUTRET_ON_SETATTR,
.alloc_layout_hdr = objlayout_alloc_layout_hdr,
.free_layout_hdr = objlayout_free_layout_hdr,
.alloc_lseg = objlayout_alloc_lseg,
.free_lseg = objlayout_free_lseg,
.read_pagelist = objlayout_read_pagelist,
.write_pagelist = objlayout_write_pagelist,
.pg_read_ops = &objio_pg_read_ops,
.pg_write_ops = &objio_pg_write_ops,
.free_deviceid_node = objio_free_deviceid_node,
.encode_layoutcommit = objlayout_encode_layoutcommit,
.encode_layoutreturn = objlayout_encode_layoutreturn,
};
MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects");
MODULE_AUTHOR("Benny Halevy <bhalevy@panasas.com>");
MODULE_LICENSE("GPL");
static int __init
objlayout_init(void)
{
int ret = pnfs_register_layoutdriver(&objlayout_type);
if (ret)
printk(KERN_INFO
"%s: Registering OSD pNFS Layout Driver failed: error=%d\n",
__func__, ret);
else
printk(KERN_INFO "%s: Registered OSD pNFS Layout Driver\n",
__func__);
return ret;
}
static void __exit
objlayout_exit(void)
{
pnfs_unregister_layoutdriver(&objlayout_type);
printk(KERN_INFO "%s: Unregistered OSD pNFS Layout Driver\n",
__func__);
}
module_init(objlayout_init);
module_exit(objlayout_exit);