#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs_page.h>
#include <linux/module.h>
#include <linux/file.h>
#include <linux/sched/mm.h>
#include <linux/sunrpc/metrics.h>
#include "flexfilelayout.h"
#include "../nfs4session.h"
#include "../nfs4idmap.h"
#include "../internal.h"
#include "../delegation.h"
#include "../nfs4trace.h"
#include "../iostat.h"
#include "../nfs.h"
#include "../nfs42.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
#define FF_LAYOUTRETURN_MAXERR 20
enum nfs4_ff_op_type {
NFS4_FF_OP_LAYOUTSTATS,
NFS4_FF_OP_LAYOUTRETURN,
};
static unsigned short io_maxretrans;
static const struct pnfs_commit_ops ff_layout_commit_ops;
static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
struct nfs_pgio_header *hdr);
static int
ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
struct nfs42_layoutstat_devinfo *devinfo,
int dev_limit, enum nfs4_ff_op_type type);
static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
const struct nfs42_layoutstat_devinfo *devinfo,
struct nfs4_ff_layout_ds_stripe *dss_info);
static struct pnfs_layout_hdr *
ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
{
struct nfs4_flexfile_layout *ffl;
ffl = kzalloc_obj(*ffl, gfp_flags);
if (ffl) {
pnfs_init_ds_commit_info(&ffl->commit_info);
INIT_LIST_HEAD(&ffl->error_list);
INIT_LIST_HEAD(&ffl->mirrors);
ffl->last_report_time = ktime_get();
ffl->commit_info.ops = &ff_layout_commit_ops;
return &ffl->generic_hdr;
} else
return NULL;
}
static void
ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
{
struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
struct nfs4_ff_layout_ds_err *err, *n;
list_for_each_entry_safe(err, n, &ffl->error_list, list) {
list_del(&err->list);
kfree(err);
}
kfree_rcu(ffl, generic_hdr.plh_rcu);
}
static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
__be32 *p;
p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
if (unlikely(p == NULL))
return -ENOBUFS;
stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
memcpy(stateid->data, p, NFS4_STATEID_SIZE);
dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
p[0], p[1], p[2], p[3]);
return 0;
}
static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
{
__be32 *p;
p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
if (unlikely(!p))
return -ENOBUFS;
memcpy(devid, p, NFS4_DEVICEID4_SIZE);
nfs4_print_deviceid(devid);
return 0;
}
static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -ENOBUFS;
fh->size = be32_to_cpup(p++);
if (fh->size > NFS_MAXFHSIZE) {
printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
fh->size);
return -EOVERFLOW;
}
p = xdr_inline_decode(xdr, fh->size);
if (unlikely(!p))
return -ENOBUFS;
memcpy(&fh->data, p, fh->size);
dprintk("%s: fh len %d\n", __func__, fh->size);
return 0;
}
static int
decode_name(struct xdr_stream *xdr, u32 *id)
{
__be32 *p;
int len;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
return -ENOBUFS;
len = be32_to_cpup(p++);
if (len < 0)
return -EINVAL;
dprintk("%s: len %u\n", __func__, len);
p = xdr_inline_decode(xdr, len);
if (unlikely(!p))
return -ENOBUFS;
if (!nfs_map_string_to_numeric((char *)p, len, id))
return -EINVAL;
return 0;
}
static struct nfsd_file *
ff_local_open_fh(struct pnfs_layout_segment *lseg, u32 ds_idx, u32 dss_id,
struct nfs_client *clp, const struct cred *cred,
struct nfs_fh *fh, fmode_t mode)
{
#if IS_ENABLED(CONFIG_NFS_LOCALIO)
struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
return nfs_local_open_fh(clp, cred, fh, &mirror->dss[dss_id].nfl, mode);
#else
return NULL;
#endif
}
static bool ff_dss_match_fh(const struct nfs4_ff_layout_ds_stripe *dss1,
const struct nfs4_ff_layout_ds_stripe *dss2)
{
int i, j;
if (dss1->fh_versions_cnt != dss2->fh_versions_cnt)
return false;
for (i = 0; i < dss1->fh_versions_cnt; i++) {
bool found_fh = false;
for (j = 0; j < dss2->fh_versions_cnt; j++) {
if (nfs_compare_fh(&dss1->fh_versions[i],
&dss2->fh_versions[j]) == 0) {
found_fh = true;
break;
}
}
if (!found_fh)
return false;
}
return true;
}
static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
const struct nfs4_ff_layout_mirror *m2)
{
u32 dss_id;
if (m1->dss_count != m2->dss_count)
return false;
for (dss_id = 0; dss_id < m1->dss_count; dss_id++)
if (!ff_dss_match_fh(&m1->dss[dss_id], &m2->dss[dss_id]))
return false;
return true;
}
static bool ff_mirror_match_devid(const struct nfs4_ff_layout_mirror *m1,
const struct nfs4_ff_layout_mirror *m2)
{
u32 dss_id;
if (m1->dss_count != m2->dss_count)
return false;
for (dss_id = 0; dss_id < m1->dss_count; dss_id++)
if (memcmp(&m1->dss[dss_id].devid,
&m2->dss[dss_id].devid,
sizeof(m1->dss[dss_id].devid)) != 0)
return false;
return true;
}
static struct nfs4_ff_layout_mirror *
ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
struct nfs4_ff_layout_mirror *mirror)
{
struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
struct nfs4_ff_layout_mirror *pos;
struct inode *inode = lo->plh_inode;
spin_lock(&inode->i_lock);
list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
if (!ff_mirror_match_devid(mirror, pos))
continue;
if (!ff_mirror_match_fh(mirror, pos))
continue;
if (refcount_inc_not_zero(&pos->ref)) {
spin_unlock(&inode->i_lock);
return pos;
}
}
list_add(&mirror->mirrors, &ff_layout->mirrors);
mirror->layout = lo;
spin_unlock(&inode->i_lock);
return mirror;
}
static void
ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
{
struct inode *inode;
if (mirror->layout == NULL)
return;
inode = mirror->layout->plh_inode;
spin_lock(&inode->i_lock);
list_del(&mirror->mirrors);
spin_unlock(&inode->i_lock);
mirror->layout = NULL;
}
static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(u32 dss_count,
gfp_t gfp_flags)
{
struct nfs4_ff_layout_mirror *mirror;
mirror = kzalloc_obj(*mirror, gfp_flags);
if (mirror == NULL)
return NULL;
spin_lock_init(&mirror->lock);
refcount_set(&mirror->ref, 1);
INIT_LIST_HEAD(&mirror->mirrors);
mirror->dss_count = dss_count;
mirror->dss =
kzalloc_objs(struct nfs4_ff_layout_ds_stripe, dss_count,
gfp_flags);
if (mirror->dss == NULL) {
kfree(mirror);
return NULL;
}
for (u32 dss_id = 0; dss_id < mirror->dss_count; dss_id++)
nfs_localio_file_init(&mirror->dss[dss_id].nfl);
return mirror;
}
static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
{
const struct cred *cred;
u32 dss_id;
ff_layout_remove_mirror(mirror);
for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) {
kfree(mirror->dss[dss_id].fh_versions);
cred = rcu_access_pointer(mirror->dss[dss_id].ro_cred);
put_cred(cred);
cred = rcu_access_pointer(mirror->dss[dss_id].rw_cred);
put_cred(cred);
nfs_close_local_fh(&mirror->dss[dss_id].nfl);
nfs4_ff_layout_put_deviceid(mirror->dss[dss_id].mirror_ds);
}
kfree(mirror->dss);
kfree(mirror);
}
static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
{
if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
ff_layout_free_mirror(mirror);
}
static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
{
u32 i;
for (i = 0; i < fls->mirror_array_cnt; i++)
ff_layout_put_mirror(fls->mirror_array[i]);
}
static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
{
if (fls) {
ff_layout_free_mirror_array(fls);
kfree(fls);
}
}
static bool
ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
struct pnfs_layout_segment *l2)
{
const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l2);
u32 i;
if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
return false;
for (i = 0; i < fl1->mirror_array_cnt; i++) {
if (fl1->mirror_array[i] != fl2->mirror_array[i])
return false;
}
return true;
}
static bool
ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
u64 end1, end2;
if (l1->iomode != l2->iomode)
return l1->iomode != IOMODE_READ;
end1 = pnfs_calc_offset_end(l1->offset, l1->length);
end2 = pnfs_calc_offset_end(l2->offset, l2->length);
if (end1 < l2->offset)
return false;
if (end2 < l1->offset)
return true;
return l2->offset <= l1->offset;
}
static bool
ff_lseg_merge(struct pnfs_layout_segment *new,
struct pnfs_layout_segment *old)
{
u64 new_end, old_end;
if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
return false;
if (new->pls_range.iomode != old->pls_range.iomode)
return false;
old_end = pnfs_calc_offset_end(old->pls_range.offset,
old->pls_range.length);
if (old_end < new->pls_range.offset)
return false;
new_end = pnfs_calc_offset_end(new->pls_range.offset,
new->pls_range.length);
if (new_end < old->pls_range.offset)
return false;
if (!ff_lseg_match_mirrors(new, old))
return false;
if (new_end < old_end)
new_end = old_end;
if (new->pls_range.offset < old->pls_range.offset)
new->pls_range.offset = old->pls_range.offset;
new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
new_end);
if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
set_bit(NFS_LSEG_ROC, &new->pls_flags);
return true;
}
static void
ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
struct pnfs_layout_segment *lseg,
struct list_head *free_me)
{
pnfs_generic_layout_insert_lseg(lo, lseg,
ff_lseg_range_is_after,
ff_lseg_merge,
free_me);
}
static u32 ff_mirror_efficiency_sum(const struct nfs4_ff_layout_mirror *mirror)
{
u32 dss_id, sum = 0;
for (dss_id = 0; dss_id < mirror->dss_count; dss_id++)
sum += mirror->dss[dss_id].efficiency;
return sum;
}
static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
{
int i, j;
for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
for (j = i + 1; j < fls->mirror_array_cnt; j++)
if (ff_mirror_efficiency_sum(fls->mirror_array[i]) <
ff_mirror_efficiency_sum(fls->mirror_array[j]))
swap(fls->mirror_array[i],
fls->mirror_array[j]);
}
}
static struct pnfs_layout_segment *
ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
struct nfs4_layoutget_res *lgr,
gfp_t gfp_flags)
{
struct pnfs_layout_segment *ret;
struct nfs4_ff_layout_segment *fls = NULL;
struct xdr_stream stream;
struct xdr_buf buf;
struct folio *scratch;
u64 stripe_unit;
u32 mirror_array_cnt;
__be32 *p;
int i, rc;
struct nfs4_ff_layout_ds_stripe *dss_info;
dprintk("--> %s\n", __func__);
scratch = folio_alloc(gfp_flags, 0);
if (!scratch)
return ERR_PTR(-ENOMEM);
xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
lgr->layoutp->len);
xdr_set_scratch_folio(&stream, scratch);
rc = -EIO;
p = xdr_inline_decode(&stream, 8 + 4);
if (!p)
goto out_err_free;
p = xdr_decode_hyper(p, &stripe_unit);
mirror_array_cnt = be32_to_cpup(p++);
dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
stripe_unit, mirror_array_cnt);
if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
mirror_array_cnt == 0)
goto out_err_free;
rc = -ENOMEM;
fls = kzalloc_flex(*fls, mirror_array, mirror_array_cnt, gfp_flags);
if (!fls)
goto out_err_free;
fls->mirror_array_cnt = mirror_array_cnt;
fls->stripe_unit = stripe_unit;
u32 dss_count = 0;
for (i = 0; i < fls->mirror_array_cnt; i++) {
struct nfs4_ff_layout_mirror *mirror;
struct cred *kcred;
const struct cred __rcu *cred;
kuid_t uid;
kgid_t gid;
u32 fh_count, id;
int j, dss_id;
rc = -EIO;
p = xdr_inline_decode(&stream, 4);
if (!p)
goto out_err_free;
if (dss_count == 0)
dss_count = be32_to_cpup(p);
else if (dss_count != be32_to_cpup(p))
goto out_err_free;
if (dss_count > NFS4_FLEXFILE_LAYOUT_MAX_STRIPE_CNT ||
dss_count == 0)
goto out_err_free;
if (dss_count > 1 && stripe_unit == 0)
goto out_err_free;
fls->mirror_array[i] = ff_layout_alloc_mirror(dss_count, gfp_flags);
if (fls->mirror_array[i] == NULL) {
rc = -ENOMEM;
goto out_err_free;
}
for (dss_id = 0; dss_id < dss_count; dss_id++) {
dss_info = &fls->mirror_array[i]->dss[dss_id];
dss_info->mirror = fls->mirror_array[i];
rc = decode_deviceid(&stream, &dss_info->devid);
if (rc)
goto out_err_free;
rc = -EIO;
p = xdr_inline_decode(&stream, 4);
if (!p)
goto out_err_free;
dss_info->efficiency = be32_to_cpup(p);
rc = decode_pnfs_stateid(&stream, &dss_info->stateid);
if (rc)
goto out_err_free;
rc = -EIO;
p = xdr_inline_decode(&stream, 4);
if (!p)
goto out_err_free;
fh_count = be32_to_cpup(p);
dss_info->fh_versions =
kzalloc_objs(struct nfs_fh, fh_count, gfp_flags);
if (dss_info->fh_versions == NULL) {
rc = -ENOMEM;
goto out_err_free;
}
for (j = 0; j < fh_count; j++) {
rc = decode_nfs_fh(&stream,
&dss_info->fh_versions[j]);
if (rc)
goto out_err_free;
}
dss_info->fh_versions_cnt = fh_count;
rc = decode_name(&stream, &id);
if (rc)
goto out_err_free;
uid = make_kuid(&init_user_ns, id);
rc = decode_name(&stream, &id);
if (rc)
goto out_err_free;
gid = make_kgid(&init_user_ns, id);
if (gfp_flags & __GFP_FS)
kcred = prepare_kernel_cred(&init_task);
else {
unsigned int nofs_flags = memalloc_nofs_save();
kcred = prepare_kernel_cred(&init_task);
memalloc_nofs_restore(nofs_flags);
}
rc = -ENOMEM;
if (!kcred)
goto out_err_free;
kcred->fsuid = uid;
kcred->fsgid = gid;
cred = RCU_INITIALIZER(kcred);
if (lgr->range.iomode == IOMODE_READ)
rcu_assign_pointer(dss_info->ro_cred, cred);
else
rcu_assign_pointer(dss_info->rw_cred, cred);
}
mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
if (mirror != fls->mirror_array[i]) {
for (dss_id = 0; dss_id < dss_count; dss_id++) {
dss_info = &fls->mirror_array[i]->dss[dss_id];
if (lgr->range.iomode == IOMODE_READ) {
cred = xchg(&mirror->dss[dss_id].ro_cred,
dss_info->ro_cred);
rcu_assign_pointer(dss_info->ro_cred, cred);
} else {
cred = xchg(&mirror->dss[dss_id].rw_cred,
dss_info->rw_cred);
rcu_assign_pointer(dss_info->rw_cred, cred);
}
}
ff_layout_free_mirror(fls->mirror_array[i]);
fls->mirror_array[i] = mirror;
}
dprintk("%s: iomode %s uid %u gid %u\n", __func__,
lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
from_kuid(&init_user_ns, uid),
from_kgid(&init_user_ns, gid));
}
p = xdr_inline_decode(&stream, 4);
if (!p)
goto out_sort_mirrors;
fls->flags = be32_to_cpup(p);
p = xdr_inline_decode(&stream, 4);
if (!p)
goto out_sort_mirrors;
for (i=0; i < fls->mirror_array_cnt; i++)
fls->mirror_array[i]->report_interval = be32_to_cpup(p);
out_sort_mirrors:
ff_layout_sort_mirrors(fls);
ret = &fls->generic_hdr;
dprintk("<-- %s (success)\n", __func__);
out_free_page:
folio_put(scratch);
return ret;
out_err_free:
_ff_layout_free_lseg(fls);
ret = ERR_PTR(rc);
dprintk("<-- %s (%d)\n", __func__, rc);
goto out_free_page;
}
static void
ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
{
struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
dprintk("--> %s\n", __func__);
if (lseg->pls_range.iomode == IOMODE_RW) {
struct nfs4_flexfile_layout *ffl;
struct inode *inode;
ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
inode = ffl->generic_hdr.plh_inode;
spin_lock(&inode->i_lock);
pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
spin_unlock(&inode->i_lock);
}
_ff_layout_free_lseg(fls);
}
static u32 calc_commit_idx(struct pnfs_layout_segment *lseg,
u32 mirror_idx, u32 dss_id)
{
struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
return (mirror_idx * flseg->mirror_array[0]->dss_count) + dss_id;
}
static u32 calc_mirror_idx_from_commit(struct pnfs_layout_segment *lseg,
u32 commit_index)
{
return commit_index / FF_LAYOUT_LSEG(lseg)->mirror_array[0]->dss_count;
}
static u32 calc_dss_id_from_commit(struct pnfs_layout_segment *lseg,
u32 commit_index)
{
return commit_index % FF_LAYOUT_LSEG(lseg)->mirror_array[0]->dss_count;
}
static void
nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
{
if (atomic_inc_return(&timer->n_ops) == 1) {
timer->start_time = now;
}
}
static ktime_t
nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
{
ktime_t start;
if (atomic_dec_return(&timer->n_ops) < 0)
WARN_ON_ONCE(1);
start = timer->start_time;
timer->start_time = now;
return ktime_sub(now, start);
}
static bool
nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
u32 dss_id,
struct nfs4_ff_layoutstat *layoutstat,
ktime_t now)
{
s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
if (!mirror->dss[dss_id].start_time)
mirror->dss[dss_id].start_time = now;
if (mirror->report_interval != 0)
report_interval = (s64)mirror->report_interval * 1000LL;
else if (layoutstats_timer != 0)
report_interval = (s64)layoutstats_timer * 1000LL;
if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
report_interval) {
ffl->last_report_time = now;
return true;
}
return false;
}
static void
nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
__u64 requested)
{
struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
iostat->ops_requested++;
iostat->bytes_requested += requested;
}
static void
nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
__u64 requested,
__u64 completed,
ktime_t time_completed,
ktime_t time_started)
{
struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
ktime_t completion_time = ktime_sub(time_completed, time_started);
ktime_t timer;
iostat->ops_completed++;
iostat->bytes_completed += completed;
iostat->bytes_not_delivered += requested - completed;
timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
iostat->total_busy_time =
ktime_add(iostat->total_busy_time, timer);
iostat->aggregate_completion_time =
ktime_add(iostat->aggregate_completion_time,
completion_time);
}
static void
nfs4_ff_layout_stat_io_start_read(struct inode *inode,
struct nfs4_ff_layout_mirror *mirror,
u32 dss_id,
__u64 requested, ktime_t now)
{
bool report;
spin_lock(&mirror->lock);
report = nfs4_ff_layoutstat_start_io(
mirror, dss_id, &mirror->dss[dss_id].read_stat, now);
nfs4_ff_layout_stat_io_update_requested(
&mirror->dss[dss_id].read_stat, requested);
set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
spin_unlock(&mirror->lock);
if (report)
pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
}
static void
nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
struct nfs4_ff_layout_mirror *mirror,
u32 dss_id,
__u64 requested,
__u64 completed)
{
spin_lock(&mirror->lock);
nfs4_ff_layout_stat_io_update_completed(&mirror->dss[dss_id].read_stat,
requested, completed,
ktime_get(), task->tk_start);
set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
spin_unlock(&mirror->lock);
}
static void
nfs4_ff_layout_stat_io_start_write(struct inode *inode,
struct nfs4_ff_layout_mirror *mirror,
u32 dss_id,
__u64 requested, ktime_t now)
{
bool report;
spin_lock(&mirror->lock);
report = nfs4_ff_layoutstat_start_io(
mirror,
dss_id,
&mirror->dss[dss_id].write_stat,
now);
nfs4_ff_layout_stat_io_update_requested(
&mirror->dss[dss_id].write_stat,
requested);
set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
spin_unlock(&mirror->lock);
if (report)
pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
}
static void
nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
struct nfs4_ff_layout_mirror *mirror,
u32 dss_id,
__u64 requested,
__u64 completed,
enum nfs3_stable_how committed)
{
if (committed == NFS_UNSTABLE)
requested = completed = 0;
spin_lock(&mirror->lock);
nfs4_ff_layout_stat_io_update_completed(&mirror->dss[dss_id].write_stat,
requested, completed, ktime_get(), task->tk_start);
set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
spin_unlock(&mirror->lock);
}
static void
ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx, u32 dss_id)
{
struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id);
if (devid)
nfs4_mark_deviceid_unavailable(devid);
}
static void
ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx, u32 dss_id)
{
struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id);
if (devid)
nfs4_mark_deviceid_available(devid);
}
static struct nfs4_pnfs_ds *
ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
u32 start_idx, u32 *best_idx,
u32 offset, u32 *dss_id,
bool check_device)
{
struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
struct nfs4_ff_layout_mirror *mirror;
struct nfs4_pnfs_ds *ds = ERR_PTR(-EAGAIN);
u32 idx;
for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
mirror = FF_LAYOUT_COMP(lseg, idx);
*dss_id = nfs4_ff_layout_calc_dss_id(
fls->stripe_unit,
fls->mirror_array[idx]->dss_count,
offset);
ds = nfs4_ff_layout_prepare_ds(lseg, mirror, *dss_id, false);
if (IS_ERR(ds))
continue;
if (check_device &&
nfs4_test_deviceid_unavailable(&mirror->dss[*dss_id].mirror_ds->id_node)) {
ds = ERR_PTR(-EINVAL);
continue;
}
*best_idx = idx;
break;
}
return ds;
}
static struct nfs4_pnfs_ds *
ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
u32 start_idx, u32 *best_idx,
u32 offset, u32 *dss_id)
{
return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx,
offset, dss_id, false);
}
static struct nfs4_pnfs_ds *
ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
u32 start_idx, u32 *best_idx,
u32 offset, u32 *dss_id)
{
return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx,
offset, dss_id, true);
}
static struct nfs4_pnfs_ds *
ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
u32 start_idx, u32 *best_idx,
u32 offset, u32 *dss_id)
{
struct nfs4_pnfs_ds *ds;
ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx,
offset, dss_id);
if (!IS_ERR(ds))
return ds;
return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx,
offset, dss_id);
}
static struct nfs4_pnfs_ds *
ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
u32 *best_idx,
u32 offset,
u32 *dss_id)
{
struct pnfs_layout_segment *lseg = pgio->pg_lseg;
struct nfs4_pnfs_ds *ds;
ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
best_idx, offset, dss_id);
if (!IS_ERR(ds) || !pgio->pg_mirror_idx)
return ds;
return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx,
offset, dss_id);
}
static void
ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req,
bool strict_iomode)
{
pnfs_put_lseg(pgio->pg_lseg);
pgio->pg_lseg =
pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
req_offset(req), req->wb_bytes, IOMODE_READ,
strict_iomode, nfs_io_gfp_mask());
if (IS_ERR(pgio->pg_lseg)) {
pgio->pg_error = PTR_ERR(pgio->pg_lseg);
pgio->pg_lseg = NULL;
}
}
static bool
ff_layout_lseg_is_striped(const struct nfs4_ff_layout_segment *fls)
{
return fls->mirror_array[0]->dss_count > 1;
}
static size_t
ff_layout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
unsigned int size;
u64 p_stripe, r_stripe;
u32 stripe_offset;
u64 segment_offset = pgio->pg_lseg->pls_range.offset;
u32 stripe_unit = FF_LAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
size = pnfs_generic_pg_test(pgio, prev, req);
if (!size)
return 0;
else if (!ff_layout_lseg_is_striped(FF_LAYOUT_LSEG(pgio->pg_lseg)))
return size;
if (prev) {
p_stripe = (u64)req_offset(prev) - segment_offset;
r_stripe = (u64)req_offset(req) - segment_offset;
do_div(p_stripe, stripe_unit);
do_div(r_stripe, stripe_unit);
if (p_stripe != r_stripe)
return 0;
}
div_u64_rem((u64)req_offset(req) - segment_offset,
stripe_unit,
&stripe_offset);
WARN_ON_ONCE(stripe_offset > stripe_unit);
if (stripe_offset >= stripe_unit)
return 0;
return min(stripe_unit - (unsigned int)stripe_offset, size);
}
static void
ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
struct nfs_pgio_mirror *pgm;
struct nfs4_ff_layout_mirror *mirror;
struct nfs4_pnfs_ds *ds;
u32 ds_idx, dss_id;
if (NFS_SERVER(pgio->pg_inode)->flags &
(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
pgio->pg_maxretrans = io_maxretrans;
retry:
pnfs_generic_pg_check_layout(pgio, req);
if (!pgio->pg_lseg) {
ff_layout_pg_get_read(pgio, req, false);
if (!pgio->pg_lseg)
goto out_nolseg;
}
if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
ff_layout_pg_get_read(pgio, req, true);
if (!pgio->pg_lseg)
goto out_nolseg;
}
req->wb_nio = 0;
ds = ff_layout_get_ds_for_read(pgio, &ds_idx,
req_offset(req), &dss_id);
if (IS_ERR(ds)) {
if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
goto out_mds;
pnfs_generic_pg_cleanup(pgio);
ssleep(1);
goto retry;
}
mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
pgm = &pgio->pg_mirrors[0];
pgm->pg_bsize = mirror->dss[dss_id].mirror_ds->ds_versions[0].rsize;
pgio->pg_mirror_idx = ds_idx;
return;
out_nolseg:
if (pgio->pg_error < 0) {
if (pgio->pg_error != -EAGAIN)
return;
if (pgio->pg_maxretrans && req->wb_nio++ > pgio->pg_maxretrans) {
if (NFS_SERVER(pgio->pg_inode)->flags & NFS_MOUNT_SOFTERR)
pgio->pg_error = -ETIMEDOUT;
else
pgio->pg_error = -EIO;
return;
}
pgio->pg_error = 0;
ssleep(1);
goto retry;
}
out_mds:
trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
0, NFS4_MAX_UINT64, IOMODE_READ,
NFS_I(pgio->pg_inode)->layout,
pgio->pg_lseg);
pgio->pg_maxretrans = 0;
nfs_pageio_reset_read_mds(pgio);
}
static void
ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
struct nfs4_ff_layout_mirror *mirror;
struct nfs_pgio_mirror *pgm;
struct nfs4_pnfs_ds *ds;
u32 i, dss_id;
retry:
pnfs_generic_pg_check_layout(pgio, req);
if (!pgio->pg_lseg) {
pgio->pg_lseg =
pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
req_offset(req), req->wb_bytes,
IOMODE_RW, false, nfs_io_gfp_mask());
if (IS_ERR(pgio->pg_lseg)) {
pgio->pg_error = PTR_ERR(pgio->pg_lseg);
pgio->pg_lseg = NULL;
return;
}
}
if (pgio->pg_lseg == NULL)
goto out_mds;
if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
goto out_eagain;
for (i = 0; i < pgio->pg_mirror_count; i++) {
mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
dss_id = nfs4_ff_layout_calc_dss_id(
FF_LAYOUT_LSEG(pgio->pg_lseg)->stripe_unit,
mirror->dss_count,
req_offset(req));
ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror,
dss_id, true);
if (IS_ERR(ds)) {
if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
goto out_mds;
pnfs_generic_pg_cleanup(pgio);
ssleep(1);
goto retry;
}
pgm = &pgio->pg_mirrors[i];
pgm->pg_bsize = mirror->dss[dss_id].mirror_ds->ds_versions[0].wsize;
}
if (NFS_SERVER(pgio->pg_inode)->flags &
(NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
pgio->pg_maxretrans = io_maxretrans;
return;
out_eagain:
pnfs_generic_pg_cleanup(pgio);
pgio->pg_error = -EAGAIN;
return;
out_mds:
trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
0, NFS4_MAX_UINT64, IOMODE_RW,
NFS_I(pgio->pg_inode)->layout,
pgio->pg_lseg);
pgio->pg_maxretrans = 0;
nfs_pageio_reset_write_mds(pgio);
pgio->pg_error = -EAGAIN;
}
static unsigned int
ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
if (!pgio->pg_lseg) {
pgio->pg_lseg =
pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
req_offset(req), req->wb_bytes,
IOMODE_RW, false, nfs_io_gfp_mask());
if (IS_ERR(pgio->pg_lseg)) {
pgio->pg_error = PTR_ERR(pgio->pg_lseg);
pgio->pg_lseg = NULL;
goto out;
}
}
if (pgio->pg_lseg)
return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
0, NFS4_MAX_UINT64, IOMODE_RW,
NFS_I(pgio->pg_inode)->layout,
pgio->pg_lseg);
nfs_pageio_reset_write_mds(pgio);
out:
return 1;
}
static u32
ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
{
u32 old = desc->pg_mirror_idx;
desc->pg_mirror_idx = idx;
return old;
}
static struct nfs_pgio_mirror *
ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
{
return &desc->pg_mirrors[idx];
}
static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
.pg_init = ff_layout_pg_init_read,
.pg_test = ff_layout_pg_test,
.pg_doio = pnfs_generic_pg_readpages,
.pg_cleanup = pnfs_generic_pg_cleanup,
};
static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
.pg_init = ff_layout_pg_init_write,
.pg_test = ff_layout_pg_test,
.pg_doio = pnfs_generic_pg_writepages,
.pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
.pg_cleanup = pnfs_generic_pg_cleanup,
.pg_get_mirror = ff_layout_pg_get_mirror_write,
.pg_set_mirror = ff_layout_pg_set_mirror_write,
};
static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
{
struct rpc_task *task = &hdr->task;
pnfs_layoutcommit_inode(hdr->inode, false);
if (retry_pnfs) {
dprintk("%s Reset task %5u for i/o through pNFS "
"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
hdr->task.tk_pid,
hdr->inode->i_sb->s_id,
(unsigned long long)NFS_FILEID(hdr->inode),
hdr->args.count,
(unsigned long long)hdr->args.offset);
hdr->completion_ops->reschedule_io(hdr);
return;
}
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
dprintk("%s Reset task %5u for i/o through MDS "
"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
hdr->task.tk_pid,
hdr->inode->i_sb->s_id,
(unsigned long long)NFS_FILEID(hdr->inode),
hdr->args.count,
(unsigned long long)hdr->args.offset);
trace_pnfs_mds_fallback_write_done(hdr->inode,
hdr->args.offset, hdr->args.count,
IOMODE_RW, NFS_I(hdr->inode)->layout,
hdr->lseg);
task->tk_status = pnfs_write_done_resend_to_mds(hdr);
}
}
static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
{
u32 idx = hdr->pgio_mirror_idx + 1;
u32 new_idx = 0;
u32 dss_id = 0;
struct nfs4_pnfs_ds *ds;
ds = ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx,
hdr->args.offset, &dss_id);
if (IS_ERR(ds))
pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
else
ff_layout_send_layouterror(hdr->lseg);
pnfs_read_resend_pnfs(hdr, new_idx);
}
static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
{
struct rpc_task *task = &hdr->task;
pnfs_layoutcommit_inode(hdr->inode, false);
pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
dprintk("%s Reset task %5u for i/o through MDS "
"(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
hdr->task.tk_pid,
hdr->inode->i_sb->s_id,
(unsigned long long)NFS_FILEID(hdr->inode),
hdr->args.count,
(unsigned long long)hdr->args.offset);
trace_pnfs_mds_fallback_read_done(hdr->inode,
hdr->args.offset, hdr->args.count,
IOMODE_READ, NFS_I(hdr->inode)->layout,
hdr->lseg);
task->tk_status = pnfs_read_done_resend_to_mds(hdr);
}
}
static int ff_layout_async_handle_error_v4(struct rpc_task *task,
u32 op_status,
struct nfs4_state *state,
struct nfs_client *clp,
struct pnfs_layout_segment *lseg,
u32 idx, u32 dss_id)
{
struct pnfs_layout_hdr *lo = lseg->pls_layout;
struct inode *inode = lo->plh_inode;
struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id);
struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
switch (op_status) {
case NFS4_OK:
case NFS4ERR_NXIO:
break;
case NFSERR_PERM:
if (!task->tk_xprt)
break;
xprt_force_disconnect(task->tk_xprt);
goto out_retry;
case NFS4ERR_BADSESSION:
case NFS4ERR_BADSLOT:
case NFS4ERR_BAD_HIGH_SLOT:
case NFS4ERR_DEADSESSION:
case NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
case NFS4ERR_SEQ_FALSE_RETRY:
case NFS4ERR_SEQ_MISORDERED:
dprintk("%s ERROR %d, Reset session. Exchangeid "
"flags 0x%x\n", __func__, task->tk_status,
clp->cl_exchange_flags);
nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
goto out_retry;
case NFS4ERR_DELAY:
nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
fallthrough;
case NFS4ERR_GRACE:
rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
goto out_retry;
case NFS4ERR_RETRY_UNCACHED_REP:
goto out_retry;
case NFS4ERR_PNFS_NO_LAYOUT:
case NFS4ERR_STALE:
case NFS4ERR_BADHANDLE:
case NFS4ERR_ISDIR:
case NFS4ERR_FHEXPIRED:
case NFS4ERR_WRONG_TYPE:
dprintk("%s Invalid layout error %d\n", __func__,
task->tk_status);
pnfs_destroy_layout(NFS_I(inode));
rpc_wake_up(&tbl->slot_tbl_waitq);
goto reset;
default:
break;
}
switch (task->tk_status) {
case -ENETDOWN:
case -ENETUNREACH:
if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags))
return -NFS4ERR_FATAL_IOERROR;
fallthrough;
case -ECONNREFUSED:
case -EHOSTDOWN:
case -EHOSTUNREACH:
case -EIO:
case -ETIMEDOUT:
case -EPIPE:
case -EPROTO:
case -ENODEV:
dprintk("%s DS connection error %d\n", __func__,
task->tk_status);
nfs4_delete_deviceid(devid->ld, devid->nfs_client,
&devid->deviceid);
rpc_wake_up(&tbl->slot_tbl_waitq);
break;
default:
break;
}
if (ff_layout_avoid_mds_available_ds(lseg))
return -NFS4ERR_RESET_TO_PNFS;
reset:
dprintk("%s Retry through MDS. Error %d\n", __func__,
task->tk_status);
return -NFS4ERR_RESET_TO_MDS;
out_retry:
task->tk_status = 0;
return -EAGAIN;
}
static int ff_layout_async_handle_error_v3(struct rpc_task *task,
u32 op_status,
struct nfs_client *clp,
struct pnfs_layout_segment *lseg,
u32 idx, u32 dss_id)
{
struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id);
switch (op_status) {
case NFS_OK:
case NFSERR_NXIO:
break;
case NFSERR_PERM:
if (!task->tk_xprt)
break;
xprt_force_disconnect(task->tk_xprt);
goto out_retry;
case NFSERR_ACCES:
case NFSERR_BADHANDLE:
case NFSERR_FBIG:
case NFSERR_IO:
case NFSERR_NOSPC:
case NFSERR_ROFS:
case NFSERR_STALE:
goto out_reset_to_pnfs;
case NFSERR_JUKEBOX:
nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
goto out_retry;
default:
break;
}
switch (task->tk_status) {
case -EACCES:
case -ESTALE:
case -EISDIR:
case -EBADHANDLE:
case -ELOOP:
case -ENOSPC:
break;
case -EJUKEBOX:
nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
goto out_retry;
case -ENETDOWN:
case -ENETUNREACH:
if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags))
return -NFS4ERR_FATAL_IOERROR;
fallthrough;
default:
dprintk("%s DS connection error %d\n", __func__,
task->tk_status);
nfs4_delete_deviceid(devid->ld, devid->nfs_client,
&devid->deviceid);
}
out_reset_to_pnfs:
return -NFS4ERR_RESET_TO_PNFS;
out_retry:
task->tk_status = 0;
rpc_restart_call_prepare(task);
rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
return -EAGAIN;
}
static int ff_layout_async_handle_error(struct rpc_task *task,
u32 op_status,
struct nfs4_state *state,
struct nfs_client *clp,
struct pnfs_layout_segment *lseg,
u32 idx, u32 dss_id)
{
int vers = clp->cl_nfs_mod->rpc_vers->number;
if (task->tk_status >= 0) {
ff_layout_mark_ds_reachable(lseg, idx, dss_id);
return 0;
}
if (!pnfs_is_valid_lseg(lseg))
return -NFS4ERR_RESET_TO_PNFS;
switch (vers) {
case 3:
return ff_layout_async_handle_error_v3(task, op_status, clp,
lseg, idx, dss_id);
case 4:
return ff_layout_async_handle_error_v4(task, op_status, state,
clp, lseg, idx, dss_id);
default:
WARN_ON_ONCE(1);
return 0;
}
}
static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
u32 idx, u32 dss_id, u64 offset, u64 length,
u32 *op_status, int opnum, int error)
{
struct nfs4_ff_layout_mirror *mirror;
u32 status = *op_status;
int err;
if (status == 0) {
switch (error) {
case -ETIMEDOUT:
case -EPFNOSUPPORT:
case -EPROTONOSUPPORT:
case -EOPNOTSUPP:
case -EINVAL:
case -ECONNREFUSED:
case -ECONNRESET:
case -EHOSTDOWN:
case -EHOSTUNREACH:
case -ENETDOWN:
case -ENETUNREACH:
case -EADDRINUSE:
case -ENOBUFS:
case -EPIPE:
case -EPERM:
case -EPROTO:
case -ENODEV:
*op_status = status = NFS4ERR_NXIO;
break;
case -EACCES:
*op_status = status = NFS4ERR_ACCESS;
break;
default:
return;
}
}
mirror = FF_LAYOUT_COMP(lseg, idx);
err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
mirror, dss_id, offset, length, status, opnum,
nfs_io_gfp_mask());
switch (status) {
case NFS4ERR_DELAY:
case NFS4ERR_GRACE:
case NFS4ERR_PERM:
break;
case NFS4ERR_NXIO:
ff_layout_mark_ds_unreachable(lseg, idx, dss_id);
if (opnum == OP_READ)
break;
fallthrough;
default:
pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
lseg);
}
dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
}
static int ff_layout_read_done_cb(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(hdr->lseg);
u32 dss_id = nfs4_ff_layout_calc_dss_id(
flseg->stripe_unit,
flseg->mirror_array[hdr->pgio_mirror_idx]->dss_count,
hdr->args.offset);
int err;
if (task->tk_status < 0) {
ff_layout_io_track_ds_error(hdr->lseg,
hdr->pgio_mirror_idx, dss_id,
hdr->args.offset, hdr->args.count,
&hdr->res.op_status, OP_READ,
task->tk_status);
trace_ff_layout_read_error(hdr, task->tk_status);
}
err = ff_layout_async_handle_error(task, hdr->res.op_status,
hdr->args.context->state,
hdr->ds_clp, hdr->lseg,
hdr->pgio_mirror_idx,
dss_id);
trace_nfs4_pnfs_read(hdr, err);
clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
switch (err) {
case -NFS4ERR_RESET_TO_PNFS:
set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
return task->tk_status;
case -NFS4ERR_RESET_TO_MDS:
set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
return task->tk_status;
case -EAGAIN:
goto out_eagain;
case -NFS4ERR_FATAL_IOERROR:
task->tk_status = -EIO;
return 0;
}
return 0;
out_eagain:
rpc_restart_call_prepare(task);
return -EAGAIN;
}
static bool
ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
{
return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
}
static void
ff_layout_set_layoutcommit(struct inode *inode,
struct pnfs_layout_segment *lseg,
loff_t end_offset)
{
if (!ff_layout_need_layoutcommit(lseg))
return;
pnfs_set_layoutcommit(inode, lseg, end_offset);
dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
(unsigned long long) NFS_I(inode)->layout->plh_lwb);
}
static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
struct nfs4_ff_layout_mirror *mirror;
u32 dss_id;
if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
return;
mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx);
dss_id = nfs4_ff_layout_calc_dss_id(
FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit,
mirror->dss_count,
hdr->args.offset);
nfs4_ff_layout_stat_io_start_read(
hdr->inode,
mirror,
dss_id,
hdr->args.count,
task->tk_start);
}
static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
struct nfs4_ff_layout_mirror *mirror;
u32 dss_id;
if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
return;
mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx);
dss_id = nfs4_ff_layout_calc_dss_id(
FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit,
mirror->dss_count,
hdr->args.offset);
nfs4_ff_layout_stat_io_end_read(
task,
mirror,
dss_id,
hdr->args.count,
hdr->res.count);
set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
}
static int ff_layout_read_prepare_common(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
rpc_exit(task, -EIO);
return -EIO;
}
if (!pnfs_is_valid_lseg(hdr->lseg)) {
rpc_exit(task, -EAGAIN);
return -EAGAIN;
}
ff_layout_read_record_layoutstats_start(task, hdr);
return 0;
}
static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
if (ff_layout_read_prepare_common(task, hdr))
return;
rpc_call_start(task);
}
static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
if (nfs4_setup_sequence(hdr->ds_clp,
&hdr->args.seq_args,
&hdr->res.seq_res,
task))
return;
ff_layout_read_prepare_common(task, hdr);
}
static void ff_layout_read_call_done(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
task->tk_status == 0) {
nfs4_sequence_done(task, &hdr->res.seq_res);
return;
}
hdr->mds_ops->rpc_call_done(task, hdr);
}
static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
ff_layout_read_record_layoutstats_done(task, hdr);
rpc_count_iostats_metrics(task,
&NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
}
static void ff_layout_read_release(void *data)
{
struct nfs_pgio_header *hdr = data;
ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
ff_layout_resend_pnfs_read(hdr);
else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
ff_layout_reset_read(hdr);
pnfs_generic_rw_release(data);
}
static int ff_layout_write_done_cb(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(hdr->lseg);
u32 dss_id = nfs4_ff_layout_calc_dss_id(
flseg->stripe_unit,
flseg->mirror_array[hdr->pgio_mirror_idx]->dss_count,
hdr->args.offset);
loff_t end_offs = 0;
int err;
if (task->tk_status < 0) {
ff_layout_io_track_ds_error(hdr->lseg,
hdr->pgio_mirror_idx, dss_id,
hdr->args.offset, hdr->args.count,
&hdr->res.op_status, OP_WRITE,
task->tk_status);
trace_ff_layout_write_error(hdr, task->tk_status);
}
err = ff_layout_async_handle_error(task, hdr->res.op_status,
hdr->args.context->state,
hdr->ds_clp, hdr->lseg,
hdr->pgio_mirror_idx,
dss_id);
trace_nfs4_pnfs_write(hdr, err);
clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
switch (err) {
case -NFS4ERR_RESET_TO_PNFS:
set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
return task->tk_status;
case -NFS4ERR_RESET_TO_MDS:
set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
return task->tk_status;
case -EAGAIN:
return -EAGAIN;
case -NFS4ERR_FATAL_IOERROR:
task->tk_status = -EIO;
return 0;
}
if (hdr->res.verf->committed == NFS_FILE_SYNC ||
hdr->res.verf->committed == NFS_DATA_SYNC)
end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
hdr->fattr.valid = 0;
if (task->tk_status >= 0)
nfs_writeback_update_inode(hdr);
return 0;
}
static int ff_layout_commit_done_cb(struct rpc_task *task,
struct nfs_commit_data *data)
{
int err;
u32 idx = calc_mirror_idx_from_commit(data->lseg, data->ds_commit_index);
u32 dss_id = calc_dss_id_from_commit(data->lseg, data->ds_commit_index);
if (task->tk_status < 0) {
ff_layout_io_track_ds_error(data->lseg, idx, dss_id,
data->args.offset, data->args.count,
&data->res.op_status, OP_COMMIT,
task->tk_status);
trace_ff_layout_commit_error(data, task->tk_status);
}
err = ff_layout_async_handle_error(task, data->res.op_status,
NULL, data->ds_clp, data->lseg, idx,
dss_id);
trace_nfs4_pnfs_commit_ds(data, err);
switch (err) {
case -NFS4ERR_RESET_TO_PNFS:
pnfs_generic_prepare_to_resend_writes(data);
return -EAGAIN;
case -NFS4ERR_RESET_TO_MDS:
pnfs_generic_prepare_to_resend_writes(data);
return -EAGAIN;
case -EAGAIN:
rpc_restart_call_prepare(task);
return -EAGAIN;
case -NFS4ERR_FATAL_IOERROR:
task->tk_status = -EIO;
return 0;
}
ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
return 0;
}
static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
struct nfs4_ff_layout_mirror *mirror;
u32 dss_id;
if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
return;
mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx);
dss_id = nfs4_ff_layout_calc_dss_id(
FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit,
mirror->dss_count,
hdr->args.offset);
nfs4_ff_layout_stat_io_start_write(
hdr->inode,
mirror,
dss_id,
hdr->args.count,
task->tk_start);
}
static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
struct nfs4_ff_layout_mirror *mirror;
u32 dss_id;
if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
return;
mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx);
dss_id = nfs4_ff_layout_calc_dss_id(
FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit,
mirror->dss_count,
hdr->args.offset);
nfs4_ff_layout_stat_io_end_write(
task,
mirror,
dss_id,
hdr->args.count,
hdr->res.count,
hdr->res.verf->committed);
set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
}
static int ff_layout_write_prepare_common(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
rpc_exit(task, -EIO);
return -EIO;
}
if (!pnfs_is_valid_lseg(hdr->lseg)) {
rpc_exit(task, -EAGAIN);
return -EAGAIN;
}
ff_layout_write_record_layoutstats_start(task, hdr);
return 0;
}
static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
if (ff_layout_write_prepare_common(task, hdr))
return;
rpc_call_start(task);
}
static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
if (nfs4_setup_sequence(hdr->ds_clp,
&hdr->args.seq_args,
&hdr->res.seq_res,
task))
return;
ff_layout_write_prepare_common(task, hdr);
}
static void ff_layout_write_call_done(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
task->tk_status == 0) {
nfs4_sequence_done(task, &hdr->res.seq_res);
return;
}
hdr->mds_ops->rpc_call_done(task, hdr);
}
static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
{
struct nfs_pgio_header *hdr = data;
ff_layout_write_record_layoutstats_done(task, hdr);
rpc_count_iostats_metrics(task,
&NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
}
static void ff_layout_write_release(void *data)
{
struct nfs_pgio_header *hdr = data;
ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
ff_layout_send_layouterror(hdr->lseg);
ff_layout_reset_write(hdr, true);
} else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
ff_layout_reset_write(hdr, false);
pnfs_generic_rw_release(data);
}
static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
struct nfs_commit_data *cdata)
{
u32 idx, dss_id;
if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
return;
idx = calc_mirror_idx_from_commit(cdata->lseg, cdata->ds_commit_index);
dss_id = calc_dss_id_from_commit(cdata->lseg, cdata->ds_commit_index);
nfs4_ff_layout_stat_io_start_write(cdata->inode,
FF_LAYOUT_COMP(cdata->lseg, idx),
dss_id,
0, task->tk_start);
}
static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
struct nfs_commit_data *cdata)
{
struct nfs_page *req;
__u64 count = 0;
u32 idx, dss_id;
if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
return;
if (task->tk_status == 0) {
list_for_each_entry(req, &cdata->pages, wb_list)
count += req->wb_bytes;
}
idx = calc_mirror_idx_from_commit(cdata->lseg, cdata->ds_commit_index);
dss_id = calc_dss_id_from_commit(cdata->lseg, cdata->ds_commit_index);
nfs4_ff_layout_stat_io_end_write(task,
FF_LAYOUT_COMP(cdata->lseg, idx),
dss_id,
count, count, NFS_FILE_SYNC);
set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
}
static int ff_layout_commit_prepare_common(struct rpc_task *task,
struct nfs_commit_data *cdata)
{
if (!pnfs_is_valid_lseg(cdata->lseg)) {
rpc_exit(task, -EAGAIN);
return -EAGAIN;
}
ff_layout_commit_record_layoutstats_start(task, cdata);
return 0;
}
static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
{
if (ff_layout_commit_prepare_common(task, data))
return;
rpc_call_start(task);
}
static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
{
struct nfs_commit_data *wdata = data;
if (nfs4_setup_sequence(wdata->ds_clp,
&wdata->args.seq_args,
&wdata->res.seq_res,
task))
return;
ff_layout_commit_prepare_common(task, data);
}
static void ff_layout_commit_done(struct rpc_task *task, void *data)
{
pnfs_generic_write_commit_done(task, data);
}
static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
{
struct nfs_commit_data *cdata = data;
ff_layout_commit_record_layoutstats_done(task, cdata);
rpc_count_iostats_metrics(task,
&NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
}
static void ff_layout_commit_release(void *data)
{
struct nfs_commit_data *cdata = data;
ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
pnfs_generic_commit_release(data);
}
static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
.rpc_call_prepare = ff_layout_read_prepare_v3,
.rpc_call_done = ff_layout_read_call_done,
.rpc_count_stats = ff_layout_read_count_stats,
.rpc_release = ff_layout_read_release,
};
static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
.rpc_call_prepare = ff_layout_read_prepare_v4,
.rpc_call_done = ff_layout_read_call_done,
.rpc_count_stats = ff_layout_read_count_stats,
.rpc_release = ff_layout_read_release,
};
static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
.rpc_call_prepare = ff_layout_write_prepare_v3,
.rpc_call_done = ff_layout_write_call_done,
.rpc_count_stats = ff_layout_write_count_stats,
.rpc_release = ff_layout_write_release,
};
static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
.rpc_call_prepare = ff_layout_write_prepare_v4,
.rpc_call_done = ff_layout_write_call_done,
.rpc_count_stats = ff_layout_write_count_stats,
.rpc_release = ff_layout_write_release,
};
static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
.rpc_call_prepare = ff_layout_commit_prepare_v3,
.rpc_call_done = ff_layout_commit_done,
.rpc_count_stats = ff_layout_commit_count_stats,
.rpc_release = ff_layout_commit_release,
};
static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
.rpc_call_prepare = ff_layout_commit_prepare_v4,
.rpc_call_done = ff_layout_commit_done,
.rpc_count_stats = ff_layout_commit_count_stats,
.rpc_release = ff_layout_commit_release,
};
static enum pnfs_try_status
ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
{
struct pnfs_layout_segment *lseg = hdr->lseg;
struct nfs4_pnfs_ds *ds;
struct rpc_clnt *ds_clnt;
struct nfsd_file *localio;
struct nfs4_ff_layout_mirror *mirror;
const struct cred *ds_cred;
loff_t offset = hdr->args.offset;
u32 idx = hdr->pgio_mirror_idx;
int vers;
struct nfs_fh *fh;
u32 dss_id;
bool ds_fatal_error = false;
dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
__func__, hdr->inode->i_ino,
hdr->args.pgbase, (size_t)hdr->args.count, offset);
mirror = FF_LAYOUT_COMP(lseg, idx);
dss_id = nfs4_ff_layout_calc_dss_id(
FF_LAYOUT_LSEG(lseg)->stripe_unit,
mirror->dss_count,
offset);
ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, false);
if (IS_ERR(ds)) {
ds_fatal_error = nfs_error_is_fatal(PTR_ERR(ds));
goto out_failed;
}
ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
hdr->inode, dss_id);
if (IS_ERR(ds_clnt))
goto out_failed;
ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred, dss_id);
if (!ds_cred)
goto out_failed;
vers = nfs4_ff_layout_ds_version(mirror, dss_id);
dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
hdr->pgio_done_cb = ff_layout_read_done_cb;
refcount_inc(&ds->ds_clp->cl_count);
hdr->ds_clp = ds->ds_clp;
fh = nfs4_ff_layout_select_ds_fh(mirror, dss_id);
if (fh)
hdr->args.fh = fh;
nfs4_ff_layout_select_ds_stateid(mirror, dss_id, &hdr->args.stateid);
hdr->args.offset = offset;
hdr->mds_offset = offset;
localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh,
FMODE_READ);
if (localio) {
hdr->task.tk_start = ktime_get();
ff_layout_read_record_layoutstats_start(&hdr->task, hdr);
}
nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
vers == 3 ? &ff_layout_read_call_ops_v3 :
&ff_layout_read_call_ops_v4,
0, RPC_TASK_SOFTCONN, localio);
put_cred(ds_cred);
return PNFS_ATTEMPTED;
out_failed:
if (ff_layout_avoid_mds_available_ds(lseg) && !ds_fatal_error)
return PNFS_TRY_AGAIN;
trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
hdr->args.offset, hdr->args.count,
IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
return PNFS_NOT_ATTEMPTED;
}
static enum pnfs_try_status
ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
{
struct pnfs_layout_segment *lseg = hdr->lseg;
struct nfs4_pnfs_ds *ds;
struct rpc_clnt *ds_clnt;
struct nfsd_file *localio;
struct nfs4_ff_layout_mirror *mirror;
const struct cred *ds_cred;
loff_t offset = hdr->args.offset;
int vers;
struct nfs_fh *fh;
u32 idx = hdr->pgio_mirror_idx;
u32 dss_id;
bool ds_fatal_error = false;
mirror = FF_LAYOUT_COMP(lseg, idx);
dss_id = nfs4_ff_layout_calc_dss_id(
FF_LAYOUT_LSEG(lseg)->stripe_unit,
mirror->dss_count,
offset);
ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, true);
if (IS_ERR(ds)) {
ds_fatal_error = nfs_error_is_fatal(PTR_ERR(ds));
goto out_failed;
}
ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
hdr->inode, dss_id);
if (IS_ERR(ds_clnt))
goto out_failed;
ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred, dss_id);
if (!ds_cred)
goto out_failed;
vers = nfs4_ff_layout_ds_version(mirror, dss_id);
dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
__func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
vers);
hdr->pgio_done_cb = ff_layout_write_done_cb;
refcount_inc(&ds->ds_clp->cl_count);
hdr->ds_clp = ds->ds_clp;
hdr->ds_commit_idx = calc_commit_idx(lseg, idx, dss_id);
fh = nfs4_ff_layout_select_ds_fh(mirror, dss_id);
if (fh)
hdr->args.fh = fh;
nfs4_ff_layout_select_ds_stateid(mirror, dss_id, &hdr->args.stateid);
hdr->args.offset = offset;
localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh,
FMODE_READ|FMODE_WRITE);
if (localio) {
hdr->task.tk_start = ktime_get();
ff_layout_write_record_layoutstats_start(&hdr->task, hdr);
}
nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
vers == 3 ? &ff_layout_write_call_ops_v3 :
&ff_layout_write_call_ops_v4,
sync, RPC_TASK_SOFTCONN, localio);
put_cred(ds_cred);
return PNFS_ATTEMPTED;
out_failed:
if (ff_layout_avoid_mds_available_ds(lseg) && !ds_fatal_error)
return PNFS_TRY_AGAIN;
trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
hdr->args.offset, hdr->args.count,
IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
return PNFS_NOT_ATTEMPTED;
}
static struct nfs_fh *
select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i, u32 dss_id)
{
struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
return &flseg->mirror_array[i]->dss[dss_id].fh_versions[0];
}
static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
{
struct pnfs_layout_segment *lseg = data->lseg;
struct nfs4_pnfs_ds *ds;
struct rpc_clnt *ds_clnt;
struct nfsd_file *localio;
struct nfs4_ff_layout_mirror *mirror;
const struct cred *ds_cred;
u32 idx, dss_id;
int vers, ret;
struct nfs_fh *fh;
if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
goto out_err;
idx = calc_mirror_idx_from_commit(lseg, data->ds_commit_index);
mirror = FF_LAYOUT_COMP(lseg, idx);
dss_id = calc_dss_id_from_commit(lseg, data->ds_commit_index);
ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, true);
if (IS_ERR(ds))
goto out_err;
ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
data->inode, dss_id);
if (IS_ERR(ds_clnt))
goto out_err;
ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred, dss_id);
if (!ds_cred)
goto out_err;
vers = nfs4_ff_layout_ds_version(mirror, dss_id);
dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
vers);
data->commit_done_cb = ff_layout_commit_done_cb;
data->cred = ds_cred;
refcount_inc(&ds->ds_clp->cl_count);
data->ds_clp = ds->ds_clp;
fh = select_ds_fh_from_commit(lseg, idx, dss_id);
if (fh)
data->args.fh = fh;
localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh,
FMODE_READ|FMODE_WRITE);
if (localio) {
data->task.tk_start = ktime_get();
ff_layout_commit_record_layoutstats_start(&data->task, data);
}
ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
vers == 3 ? &ff_layout_commit_call_ops_v3 :
&ff_layout_commit_call_ops_v4,
how, RPC_TASK_SOFTCONN, localio);
put_cred(ds_cred);
return ret;
out_err:
pnfs_generic_prepare_to_resend_writes(data);
pnfs_generic_commit_release(data);
return -EAGAIN;
}
static int
ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
int how, struct nfs_commit_info *cinfo)
{
return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
ff_layout_initiate_commit);
}
static bool ff_layout_match_rw(const struct rpc_task *task,
const struct nfs_pgio_header *hdr,
const struct pnfs_layout_segment *lseg)
{
return hdr->lseg == lseg;
}
static bool ff_layout_match_commit(const struct rpc_task *task,
const struct nfs_commit_data *cdata,
const struct pnfs_layout_segment *lseg)
{
return cdata->lseg == lseg;
}
static bool ff_layout_match_io(const struct rpc_task *task, const void *data)
{
const struct rpc_call_ops *ops = task->tk_ops;
if (ops == &ff_layout_read_call_ops_v3 ||
ops == &ff_layout_read_call_ops_v4 ||
ops == &ff_layout_write_call_ops_v3 ||
ops == &ff_layout_write_call_ops_v4)
return ff_layout_match_rw(task, task->tk_calldata, data);
if (ops == &ff_layout_commit_call_ops_v3 ||
ops == &ff_layout_commit_call_ops_v4)
return ff_layout_match_commit(task, task->tk_calldata, data);
return false;
}
static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg)
{
struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
struct nfs4_ff_layout_mirror *mirror;
struct nfs4_ff_layout_ds *mirror_ds;
struct nfs4_pnfs_ds *ds;
struct nfs_client *ds_clp;
struct rpc_clnt *clnt;
u32 idx, dss_id;
for (idx = 0; idx < flseg->mirror_array_cnt; idx++) {
mirror = flseg->mirror_array[idx];
for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) {
mirror_ds = mirror->dss[dss_id].mirror_ds;
if (IS_ERR_OR_NULL(mirror_ds))
continue;
ds = mirror->dss[dss_id].mirror_ds->ds;
if (!ds)
continue;
ds_clp = ds->ds_clp;
if (!ds_clp)
continue;
clnt = ds_clp->cl_rpcclient;
if (!clnt)
continue;
if (!rpc_cancel_tasks(clnt, -EAGAIN,
ff_layout_match_io, lseg))
continue;
rpc_clnt_disconnect(clnt);
}
}
}
static struct pnfs_ds_commit_info *
ff_layout_get_ds_info(struct inode *inode)
{
struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
if (layout == NULL)
return NULL;
return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
}
static void
ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
struct pnfs_layout_segment *lseg)
{
struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
struct inode *inode = lseg->pls_layout->plh_inode;
struct pnfs_commit_array *array, *new;
u32 size = flseg->mirror_array_cnt * flseg->mirror_array[0]->dss_count;
new = pnfs_alloc_commit_array(size,
nfs_io_gfp_mask());
if (new) {
spin_lock(&inode->i_lock);
array = pnfs_add_commit_array(fl_cinfo, new, lseg);
spin_unlock(&inode->i_lock);
if (array != new)
pnfs_free_commit_array(new);
}
}
static void
ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
struct inode *inode)
{
spin_lock(&inode->i_lock);
pnfs_generic_ds_cinfo_destroy(fl_cinfo);
spin_unlock(&inode->i_lock);
}
static void
ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
{
nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
id_node));
}
static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
const struct nfs4_layoutreturn_args *args,
const struct nfs4_flexfile_layoutreturn_args *ff_args)
{
__be32 *start;
start = xdr_reserve_space(xdr, 4);
if (unlikely(!start))
return -E2BIG;
*start = cpu_to_be32(ff_args->num_errors);
return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
}
static void
ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
const nfs4_stateid *stateid,
const struct nfs42_layoutstat_devinfo *devinfo)
{
__be32 *p;
p = xdr_reserve_space(xdr, 8 + 8);
p = xdr_encode_hyper(p, devinfo->offset);
p = xdr_encode_hyper(p, devinfo->length);
encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
p = xdr_reserve_space(xdr, 4*8);
p = xdr_encode_hyper(p, devinfo->read_count);
p = xdr_encode_hyper(p, devinfo->read_bytes);
p = xdr_encode_hyper(p, devinfo->write_count);
p = xdr_encode_hyper(p, devinfo->write_bytes);
encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
}
static void
ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
const nfs4_stateid *stateid,
const struct nfs42_layoutstat_devinfo *devinfo)
{
ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
ff_layout_encode_ff_layoutupdate(xdr, devinfo,
devinfo->ld_private.data);
}
static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
const struct nfs4_layoutreturn_args *args,
struct nfs4_flexfile_layoutreturn_args *ff_args)
{
__be32 *p;
int i;
p = xdr_reserve_space(xdr, 4);
*p = cpu_to_be32(ff_args->num_dev);
for (i = 0; i < ff_args->num_dev; i++)
ff_layout_encode_ff_iostat(xdr,
&args->layout->plh_stateid,
&ff_args->devinfo[i]);
}
static void
ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
unsigned int num_entries)
{
unsigned int i;
for (i = 0; i < num_entries; i++) {
if (!devinfo[i].ld_private.ops)
continue;
if (!devinfo[i].ld_private.ops->free)
continue;
devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
}
}
static struct nfs4_deviceid_node *
ff_layout_alloc_deviceid_node(struct nfs_server *server,
struct pnfs_device *pdev, gfp_t gfp_flags)
{
struct nfs4_ff_layout_ds *dsaddr;
dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
if (!dsaddr)
return NULL;
return &dsaddr->id_node;
}
static void
ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
const void *voidargs,
const struct nfs4_xdr_opaque_data *ff_opaque)
{
const struct nfs4_layoutreturn_args *args = voidargs;
struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
struct xdr_buf tmp_buf = {
.head = {
[0] = {
.iov_base = page_address(ff_args->pages[0]),
},
},
.buflen = PAGE_SIZE,
};
struct xdr_stream tmp_xdr;
__be32 *start;
dprintk("%s: Begin\n", __func__);
xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
start = xdr_reserve_space(xdr, 4);
*start = cpu_to_be32(tmp_buf.len);
xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
dprintk("%s: Return\n", __func__);
}
static void
ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
{
struct nfs4_flexfile_layoutreturn_args *ff_args;
if (!args->data)
return;
ff_args = args->data;
args->data = NULL;
ff_layout_free_ds_ioerr(&ff_args->errors);
ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
put_page(ff_args->pages[0]);
kfree(ff_args);
}
static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
.encode = ff_layout_encode_layoutreturn,
.free = ff_layout_free_layoutreturn,
};
static int
ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
{
struct nfs4_flexfile_layoutreturn_args *ff_args;
struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
ff_args = kmalloc_obj(*ff_args, nfs_io_gfp_mask());
if (!ff_args)
goto out_nomem;
ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
if (!ff_args->pages[0])
goto out_nomem_free;
INIT_LIST_HEAD(&ff_args->errors);
ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
&args->range, &ff_args->errors,
FF_LAYOUTRETURN_MAXERR);
spin_lock(&args->inode->i_lock);
ff_args->num_dev = ff_layout_mirror_prepare_stats(
&ff_layout->generic_hdr, &ff_args->devinfo[0],
ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN);
spin_unlock(&args->inode->i_lock);
args->ld_private->ops = &layoutreturn_ops;
args->ld_private->data = ff_args;
return 0;
out_nomem_free:
kfree(ff_args);
out_nomem:
return -ENOMEM;
}
#ifdef CONFIG_NFS_V4_2
void
ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
{
struct pnfs_layout_hdr *lo = lseg->pls_layout;
struct nfs42_layout_error *errors;
LIST_HEAD(head);
if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
return;
ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
if (list_empty(&head))
return;
errors = kmalloc_objs(*errors, NFS42_LAYOUTERROR_MAX, nfs_io_gfp_mask());
if (errors != NULL) {
const struct nfs4_ff_layout_ds_err *pos;
size_t n = 0;
list_for_each_entry(pos, &head, list) {
errors[n].offset = pos->offset;
errors[n].length = pos->length;
nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
errors[n].errors[0].dev_id = pos->deviceid;
errors[n].errors[0].status = pos->status;
errors[n].errors[0].opnum = pos->opnum;
n++;
if (!list_is_last(&pos->list, &head) &&
n < NFS42_LAYOUTERROR_MAX)
continue;
if (nfs42_proc_layouterror(lseg, errors, n) < 0)
break;
n = 0;
}
kfree(errors);
}
ff_layout_free_ds_ioerr(&head);
}
#else
void
ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
{
}
#endif
static int
ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
{
const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
}
static size_t
ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
const int buflen)
{
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
const struct in6_addr *addr = &sin6->sin6_addr;
if (ipv6_addr_any(addr))
return snprintf(buf, buflen, "::");
if (ipv6_addr_loopback(addr))
return snprintf(buf, buflen, "::1");
if (ipv6_addr_v4mapped(addr))
return snprintf(buf, buflen, "::ffff:%pI4",
&addr->s6_addr32[3]);
return snprintf(buf, buflen, "%pI6c", addr);
}
static void
ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
{
struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
char portbuf[RPCBIND_MAXUADDRPLEN];
char addrbuf[RPCBIND_MAXUADDRLEN];
unsigned short port;
int len, netid_len;
__be32 *p;
switch (sap->sa_family) {
case AF_INET:
if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
return;
port = ntohs(((struct sockaddr_in *)sap)->sin_port);
break;
case AF_INET6:
if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
return;
port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
break;
default:
WARN_ON_ONCE(1);
return;
}
snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
netid_len = strlen(da->da_netid);
p = xdr_reserve_space(xdr, 4 + netid_len);
xdr_encode_opaque(p, da->da_netid, netid_len);
p = xdr_reserve_space(xdr, 4 + len);
xdr_encode_opaque(p, addrbuf, len);
}
static void
ff_layout_encode_nfstime(struct xdr_stream *xdr,
ktime_t t)
{
struct timespec64 ts;
__be32 *p;
p = xdr_reserve_space(xdr, 12);
ts = ktime_to_timespec64(t);
p = xdr_encode_hyper(p, ts.tv_sec);
*p++ = cpu_to_be32(ts.tv_nsec);
}
static void
ff_layout_encode_io_latency(struct xdr_stream *xdr,
struct nfs4_ff_io_stat *stat)
{
__be32 *p;
p = xdr_reserve_space(xdr, 5 * 8);
p = xdr_encode_hyper(p, stat->ops_requested);
p = xdr_encode_hyper(p, stat->bytes_requested);
p = xdr_encode_hyper(p, stat->ops_completed);
p = xdr_encode_hyper(p, stat->bytes_completed);
p = xdr_encode_hyper(p, stat->bytes_not_delivered);
ff_layout_encode_nfstime(xdr, stat->total_busy_time);
ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
}
static void
ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
const struct nfs42_layoutstat_devinfo *devinfo,
struct nfs4_ff_layout_ds_stripe *dss_info)
{
struct nfs4_pnfs_ds_addr *da;
struct nfs4_pnfs_ds *ds = dss_info->mirror_ds->ds;
struct nfs_fh *fh = &dss_info->fh_versions[0];
__be32 *p;
da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
dprintk("%s: DS %s: encoding address %s\n",
__func__, ds->ds_remotestr, da->da_remotestr);
ff_layout_encode_netaddr(xdr, da);
p = xdr_reserve_space(xdr, 4 + fh->size);
xdr_encode_opaque(p, fh->data, fh->size);
spin_lock(&dss_info->mirror->lock);
ff_layout_encode_io_latency(xdr,
&dss_info->read_stat.io_stat);
ff_layout_encode_io_latency(xdr,
&dss_info->write_stat.io_stat);
spin_unlock(&dss_info->mirror->lock);
ff_layout_encode_nfstime(xdr,
ktime_sub(ktime_get(),
dss_info->start_time));
p = xdr_reserve_space(xdr, 4);
*p = cpu_to_be32(false);
}
static void
ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
const struct nfs4_xdr_opaque_data *opaque)
{
struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
struct nfs42_layoutstat_devinfo, ld_private);
__be32 *start;
start = xdr_reserve_space(xdr, 4);
ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
*start = cpu_to_be32((xdr->p - start - 1) * 4);
}
static void
ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
{
struct nfs4_ff_layout_ds_stripe *dss_info = opaque->data;
struct nfs4_ff_layout_mirror *mirror = dss_info->mirror;
ff_layout_put_mirror(mirror);
}
static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
.encode = ff_layout_encode_layoutstats,
.free = ff_layout_free_layoutstats,
};
static int
ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
struct nfs42_layoutstat_devinfo *devinfo,
int dev_limit, enum nfs4_ff_op_type type)
{
struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
struct nfs4_ff_layout_mirror *mirror;
struct nfs4_ff_layout_ds_stripe *dss_info;
struct nfs4_deviceid_node *dev;
int i = 0, dss_id;
list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
for (dss_id = 0; dss_id < mirror->dss_count; ++dss_id) {
dss_info = &mirror->dss[dss_id];
if (i >= dev_limit)
break;
if (IS_ERR_OR_NULL(dss_info->mirror_ds))
continue;
if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL,
&mirror->flags) &&
type != NFS4_FF_OP_LAYOUTRETURN)
continue;
if (!refcount_inc_not_zero(&mirror->ref))
continue;
dev = &dss_info->mirror_ds->id_node;
memcpy(&devinfo->dev_id,
&dev->deviceid,
NFS4_DEVICEID4_SIZE);
devinfo->offset = 0;
devinfo->length = NFS4_MAX_UINT64;
spin_lock(&mirror->lock);
devinfo->read_count =
dss_info->read_stat.io_stat.ops_completed;
devinfo->read_bytes =
dss_info->read_stat.io_stat.bytes_completed;
devinfo->write_count =
dss_info->write_stat.io_stat.ops_completed;
devinfo->write_bytes =
dss_info->write_stat.io_stat.bytes_completed;
spin_unlock(&mirror->lock);
devinfo->layout_type = LAYOUT_FLEX_FILES;
devinfo->ld_private.ops = &layoutstat_ops;
devinfo->ld_private.data = &mirror->dss[dss_id];
devinfo++;
i++;
}
}
return i;
}
static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
{
struct pnfs_layout_hdr *lo;
struct nfs4_flexfile_layout *ff_layout;
const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
args->devinfo = kmalloc_objs(*args->devinfo, dev_count,
nfs_io_gfp_mask());
if (!args->devinfo)
return -ENOMEM;
spin_lock(&args->inode->i_lock);
lo = NFS_I(args->inode)->layout;
if (lo && pnfs_layout_is_valid(lo)) {
ff_layout = FF_LAYOUT_FROM_HDR(lo);
args->num_dev = ff_layout_mirror_prepare_stats(
&ff_layout->generic_hdr, &args->devinfo[0], dev_count,
NFS4_FF_OP_LAYOUTSTATS);
} else
args->num_dev = 0;
spin_unlock(&args->inode->i_lock);
if (!args->num_dev) {
kfree(args->devinfo);
args->devinfo = NULL;
return -ENOENT;
}
return 0;
}
static int
ff_layout_set_layoutdriver(struct nfs_server *server,
const struct nfs_fh *dummy)
{
#if IS_ENABLED(CONFIG_NFS_V4_2)
server->caps |= NFS_CAP_LAYOUTSTATS | NFS_CAP_REBOOT_LAYOUTRETURN;
#endif
return 0;
}
static const struct pnfs_commit_ops ff_layout_commit_ops = {
.setup_ds_info = ff_layout_setup_ds_info,
.release_ds_info = ff_layout_release_ds_info,
.mark_request_commit = pnfs_layout_mark_request_commit,
.clear_request_commit = pnfs_generic_clear_request_commit,
.scan_commit_lists = pnfs_generic_scan_commit_lists,
.recover_commit_reqs = pnfs_generic_recover_commit_reqs,
.commit_pagelist = ff_layout_commit_pagelist,
};
static struct pnfs_layoutdriver_type flexfilelayout_type = {
.id = LAYOUT_FLEX_FILES,
.name = "LAYOUT_FLEX_FILES",
.owner = THIS_MODULE,
.flags = PNFS_LAYOUTGET_ON_OPEN,
.max_layoutget_response = 4096,
.set_layoutdriver = ff_layout_set_layoutdriver,
.alloc_layout_hdr = ff_layout_alloc_layout_hdr,
.free_layout_hdr = ff_layout_free_layout_hdr,
.alloc_lseg = ff_layout_alloc_lseg,
.free_lseg = ff_layout_free_lseg,
.add_lseg = ff_layout_add_lseg,
.pg_read_ops = &ff_layout_pg_read_ops,
.pg_write_ops = &ff_layout_pg_write_ops,
.get_ds_info = ff_layout_get_ds_info,
.free_deviceid_node = ff_layout_free_deviceid_node,
.read_pagelist = ff_layout_read_pagelist,
.write_pagelist = ff_layout_write_pagelist,
.alloc_deviceid_node = ff_layout_alloc_deviceid_node,
.prepare_layoutreturn = ff_layout_prepare_layoutreturn,
.sync = pnfs_nfs_generic_sync,
.prepare_layoutstats = ff_layout_prepare_layoutstats,
.cancel_io = ff_layout_cancel_io,
};
static int __init nfs4flexfilelayout_init(void)
{
printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
__func__);
return pnfs_register_layoutdriver(&flexfilelayout_type);
}
static void __exit nfs4flexfilelayout_exit(void)
{
printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
__func__);
pnfs_unregister_layoutdriver(&flexfilelayout_type);
}
MODULE_ALIAS("nfs-layouttype4-4");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
module_init(nfs4flexfilelayout_init);
module_exit(nfs4flexfilelayout_exit);
module_param(io_maxretrans, ushort, 0644);
MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
"retries an I/O request before returning an error. ");
