unimore/kernel-hacking-2024-linux-steffo
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kernel-hacking-2024-linux-s.../fs/nfs/objlayout/objio_osd.c
Trond Myklebust dce81290ee NFS: Move the pnfs write code into pnfs.c 
...and ensure that we recoalese to take into account differences in
differences in block sizes when falling back to write through the MDS.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2011-07-15 09:12:22 -04:00

1069 lines
26 KiB
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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);
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