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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /fs/nfs/flexfilelayout
parentInitial commit. (diff)
downloadlinux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz
linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/nfs/flexfilelayout')
-rw-r--r--fs/nfs/flexfilelayout/Makefile6
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.c2545
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.h226
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayoutdev.c619
4 files changed, 3396 insertions, 0 deletions
diff --git a/fs/nfs/flexfilelayout/Makefile b/fs/nfs/flexfilelayout/Makefile
new file mode 100644
index 000000000..49f03422b
--- /dev/null
+++ b/fs/nfs/flexfilelayout/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the pNFS Flexfile Layout Driver kernel module
+#
+obj-$(CONFIG_PNFS_FLEXFILE_LAYOUT) += nfs_layout_flexfiles.o
+nfs_layout_flexfiles-y := flexfilelayout.o flexfilelayoutdev.o
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
new file mode 100644
index 000000000..e4f2820ba
--- /dev/null
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -0,0 +1,2545 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Module for pnfs flexfile layout driver.
+ *
+ * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
+ *
+ * Tao Peng <bergwolf@primarydata.com>
+ */
+
+#include <linux/nfs_fs.h>
+#include <linux/nfs_mount.h>
+#include <linux/nfs_page.h>
+#include <linux/module.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
+
+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);
+static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
+ const struct nfs42_layoutstat_devinfo *devinfo,
+ struct nfs4_ff_layout_mirror *mirror);
+
+static struct pnfs_layout_hdr *
+ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
+{
+ struct nfs4_flexfile_layout *ffl;
+
+ ffl = kzalloc(sizeof(*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;
+ }
+ /* fh.data */
+ 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;
+}
+
+/*
+ * Currently only stringified uids and gids are accepted.
+ * I.e., kerberos is not supported to the DSes, so no pricipals.
+ *
+ * That means that one common function will suffice, but when
+ * principals are added, this should be split to accomodate
+ * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
+ */
+static int
+decode_name(struct xdr_stream *xdr, u32 *id)
+{
+ __be32 *p;
+ int len;
+
+ /* opaque_length(4)*/
+ 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);
+
+ /* opaque body */
+ 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 bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
+ const struct nfs4_ff_layout_mirror *m2)
+{
+ int i, j;
+
+ if (m1->fh_versions_cnt != m2->fh_versions_cnt)
+ return false;
+ for (i = 0; i < m1->fh_versions_cnt; i++) {
+ bool found_fh = false;
+ for (j = 0; j < m2->fh_versions_cnt; j++) {
+ if (nfs_compare_fh(&m1->fh_versions[i],
+ &m2->fh_versions[j]) == 0) {
+ found_fh = true;
+ break;
+ }
+ }
+ if (!found_fh)
+ 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 (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
+ 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(gfp_t gfp_flags)
+{
+ struct nfs4_ff_layout_mirror *mirror;
+
+ mirror = kzalloc(sizeof(*mirror), gfp_flags);
+ if (mirror != NULL) {
+ spin_lock_init(&mirror->lock);
+ refcount_set(&mirror->ref, 1);
+ INIT_LIST_HEAD(&mirror->mirrors);
+ }
+ return mirror;
+}
+
+static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
+{
+ const struct cred *cred;
+
+ ff_layout_remove_mirror(mirror);
+ kfree(mirror->fh_versions);
+ cred = rcu_access_pointer(mirror->ro_cred);
+ put_cred(cred);
+ cred = rcu_access_pointer(mirror->rw_cred);
+ put_cred(cred);
+ nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
+ 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(l1);
+ 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;
+
+ /* Mergeable: copy info from 'old' to 'new' */
+ 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 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 (fls->mirror_array[i]->efficiency <
+ fls->mirror_array[j]->efficiency)
+ 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 page *scratch;
+ u64 stripe_unit;
+ u32 mirror_array_cnt;
+ __be32 *p;
+ int i, rc;
+
+ dprintk("--> %s\n", __func__);
+ scratch = alloc_page(gfp_flags);
+ if (!scratch)
+ return ERR_PTR(-ENOMEM);
+
+ xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
+ lgr->layoutp->len);
+ xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
+
+ /* stripe unit and mirror_array_cnt */
+ 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(struct_size(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;
+
+ 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 ds_count, fh_count, id;
+ int j;
+
+ rc = -EIO;
+ p = xdr_inline_decode(&stream, 4);
+ if (!p)
+ goto out_err_free;
+ ds_count = be32_to_cpup(p);
+
+ /* FIXME: allow for striping? */
+ if (ds_count != 1)
+ goto out_err_free;
+
+ fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
+ if (fls->mirror_array[i] == NULL) {
+ rc = -ENOMEM;
+ goto out_err_free;
+ }
+
+ fls->mirror_array[i]->ds_count = ds_count;
+
+ /* deviceid */
+ rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
+ if (rc)
+ goto out_err_free;
+
+ /* efficiency */
+ rc = -EIO;
+ p = xdr_inline_decode(&stream, 4);
+ if (!p)
+ goto out_err_free;
+ fls->mirror_array[i]->efficiency = be32_to_cpup(p);
+
+ /* stateid */
+ rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
+ if (rc)
+ goto out_err_free;
+
+ /* fh */
+ rc = -EIO;
+ p = xdr_inline_decode(&stream, 4);
+ if (!p)
+ goto out_err_free;
+ fh_count = be32_to_cpup(p);
+
+ fls->mirror_array[i]->fh_versions =
+ kcalloc(fh_count, sizeof(struct nfs_fh),
+ gfp_flags);
+ if (fls->mirror_array[i]->fh_versions == NULL) {
+ rc = -ENOMEM;
+ goto out_err_free;
+ }
+
+ for (j = 0; j < fh_count; j++) {
+ rc = decode_nfs_fh(&stream,
+ &fls->mirror_array[i]->fh_versions[j]);
+ if (rc)
+ goto out_err_free;
+ }
+
+ fls->mirror_array[i]->fh_versions_cnt = fh_count;
+
+ /* user */
+ rc = decode_name(&stream, &id);
+ if (rc)
+ goto out_err_free;
+
+ uid = make_kuid(&init_user_ns, id);
+
+ /* group */
+ 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(NULL);
+ else {
+ unsigned int nofs_flags = memalloc_nofs_save();
+ kcred = prepare_kernel_cred(NULL);
+ 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(fls->mirror_array[i]->ro_cred, cred);
+ else
+ rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
+
+ mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
+ if (mirror != fls->mirror_array[i]) {
+ /* swap cred ptrs so free_mirror will clean up old */
+ if (lgr->range.iomode == IOMODE_READ) {
+ cred = xchg(&mirror->ro_cred, cred);
+ rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
+ } else {
+ cred = xchg(&mirror->rw_cred, cred);
+ rcu_assign_pointer(fls->mirror_array[i]->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:
+ __free_page(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 void
+nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
+{
+ /* first IO request? */
+ 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,
+ 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->start_time)
+ mirror->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,
+ __u64 requested, ktime_t now)
+{
+ bool report;
+
+ spin_lock(&mirror->lock);
+ report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
+ nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
+ set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
+ spin_unlock(&mirror->lock);
+
+ if (report)
+ pnfs_report_layoutstat(inode, GFP_KERNEL);
+}
+
+static void
+nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
+ struct nfs4_ff_layout_mirror *mirror,
+ __u64 requested,
+ __u64 completed)
+{
+ spin_lock(&mirror->lock);
+ nfs4_ff_layout_stat_io_update_completed(&mirror->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,
+ __u64 requested, ktime_t now)
+{
+ bool report;
+
+ spin_lock(&mirror->lock);
+ report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
+ nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
+ set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
+ spin_unlock(&mirror->lock);
+
+ if (report)
+ pnfs_report_layoutstat(inode, GFP_NOIO);
+}
+
+static void
+nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
+ struct nfs4_ff_layout_mirror *mirror,
+ __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->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)
+{
+ struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
+
+ if (devid)
+ nfs4_mark_deviceid_unavailable(devid);
+}
+
+static void
+ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
+{
+ struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
+
+ 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,
+ bool check_device)
+{
+ struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs4_pnfs_ds *ds;
+ bool fail_return = false;
+ u32 idx;
+
+ /* mirrors are initially sorted by efficiency */
+ for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
+ if (idx+1 == fls->mirror_array_cnt)
+ fail_return = !check_device;
+
+ mirror = FF_LAYOUT_COMP(lseg, idx);
+ ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return);
+ if (!ds)
+ continue;
+
+ if (check_device &&
+ nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
+ continue;
+
+ *best_idx = idx;
+ return ds;
+ }
+
+ return NULL;
+}
+
+static struct nfs4_pnfs_ds *
+ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
+ u32 start_idx, u32 *best_idx)
+{
+ return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
+}
+
+static struct nfs4_pnfs_ds *
+ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
+ u32 start_idx, u32 *best_idx)
+{
+ return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
+}
+
+static struct nfs4_pnfs_ds *
+ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
+ u32 start_idx, u32 *best_idx)
+{
+ struct nfs4_pnfs_ds *ds;
+
+ ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
+ if (ds)
+ return ds;
+ return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
+}
+
+static struct nfs4_pnfs_ds *
+ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
+ u32 *best_idx)
+{
+ 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);
+ if (ds || !pgio->pg_mirror_idx)
+ return ds;
+ return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
+}
+
+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,
+ GFP_KERNEL);
+ if (IS_ERR(pgio->pg_lseg)) {
+ pgio->pg_error = PTR_ERR(pgio->pg_lseg);
+ pgio->pg_lseg = NULL;
+ }
+}
+
+static void
+ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *req)
+{
+ pnfs_generic_pg_check_layout(pgio);
+ pnfs_generic_pg_check_range(pgio, req);
+}
+
+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;
+
+retry:
+ ff_layout_pg_check_layout(pgio, req);
+ /* Use full layout for now */
+ 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;
+ }
+
+ ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
+ if (!ds) {
+ if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
+ goto out_mds;
+ pnfs_generic_pg_cleanup(pgio);
+ /* Sleep for 1 second before retrying */
+ ssleep(1);
+ goto retry;
+ }
+
+ mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
+ pgm = &pgio->pg_mirrors[0];
+ pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
+
+ pgio->pg_mirror_idx = ds_idx;
+
+ if (NFS_SERVER(pgio->pg_inode)->flags &
+ (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
+ pgio->pg_maxretrans = io_maxretrans;
+ return;
+out_nolseg:
+ if (pgio->pg_error < 0)
+ return;
+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;
+
+retry:
+ ff_layout_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,
+ GFP_NOFS);
+ if (IS_ERR(pgio->pg_lseg)) {
+ pgio->pg_error = PTR_ERR(pgio->pg_lseg);
+ pgio->pg_lseg = NULL;
+ return;
+ }
+ }
+ /* If no lseg, fall back to write through mds */
+ if (pgio->pg_lseg == NULL)
+ goto out_mds;
+
+ /* Use a direct mapping of ds_idx to pgio mirror_idx */
+ 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);
+ ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
+ if (!ds) {
+ if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
+ goto out_mds;
+ pnfs_generic_pg_cleanup(pgio);
+ /* Sleep for 1 second before retrying */
+ ssleep(1);
+ goto retry;
+ }
+ pgm = &pgio->pg_mirrors[i];
+ pgm->pg_bsize = mirror->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,
+ GFP_NOFS);
+ 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);
+ /* no lseg means that pnfs is not in use, so no mirroring here */
+ 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 = pnfs_generic_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 = pnfs_generic_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;
+
+ if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
+ ff_layout_send_layouterror(hdr->lseg);
+ else
+ pnfs_error_mark_layout_for_return(hdr->inode, 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,
+ struct nfs4_state *state,
+ struct nfs_client *clp,
+ struct pnfs_layout_segment *lseg,
+ u32 idx)
+{
+ 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);
+ struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
+
+ switch (task->tk_status) {
+ 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);
+ break;
+ case -NFS4ERR_DELAY:
+ case -NFS4ERR_GRACE:
+ rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
+ break;
+ case -NFS4ERR_RETRY_UNCACHED_REP:
+ break;
+ /* Invalidate Layout errors */
+ case -NFS4ERR_PNFS_NO_LAYOUT:
+ case -ESTALE: /* mapped NFS4ERR_STALE */
+ case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
+ case -EISDIR: /* mapped NFS4ERR_ISDIR */
+ case -NFS4ERR_FHEXPIRED:
+ case -NFS4ERR_WRONG_TYPE:
+ dprintk("%s Invalid layout error %d\n", __func__,
+ task->tk_status);
+ /*
+ * Destroy layout so new i/o will get a new layout.
+ * Layout will not be destroyed until all current lseg
+ * references are put. Mark layout as invalid to resend failed
+ * i/o and all i/o waiting on the slot table to the MDS until
+ * layout is destroyed and a new valid layout is obtained.
+ */
+ pnfs_destroy_layout(NFS_I(inode));
+ rpc_wake_up(&tbl->slot_tbl_waitq);
+ goto reset;
+ /* RPC connection errors */
+ case -ECONNREFUSED:
+ case -EHOSTDOWN:
+ case -EHOSTUNREACH:
+ case -ENETUNREACH:
+ case -EIO:
+ case -ETIMEDOUT:
+ case -EPIPE:
+ 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);
+ fallthrough;
+ default:
+ 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;
+ }
+ task->tk_status = 0;
+ return -EAGAIN;
+}
+
+/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
+static int ff_layout_async_handle_error_v3(struct rpc_task *task,
+ struct pnfs_layout_segment *lseg,
+ u32 idx)
+{
+ struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
+
+ switch (task->tk_status) {
+ /* File access problems. Don't mark the device as unavailable */
+ 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;
+ default:
+ dprintk("%s DS connection error %d\n", __func__,
+ task->tk_status);
+ nfs4_delete_deviceid(devid->ld, devid->nfs_client,
+ &devid->deviceid);
+ }
+ /* FIXME: Need to prevent infinite looping here. */
+ 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,
+ struct nfs4_state *state,
+ struct nfs_client *clp,
+ struct pnfs_layout_segment *lseg,
+ u32 idx)
+{
+ int vers = clp->cl_nfs_mod->rpc_vers->number;
+
+ if (task->tk_status >= 0) {
+ ff_layout_mark_ds_reachable(lseg, idx);
+ return 0;
+ }
+
+ /* Handle the case of an invalid layout segment */
+ if (!pnfs_is_valid_lseg(lseg))
+ return -NFS4ERR_RESET_TO_PNFS;
+
+ switch (vers) {
+ case 3:
+ return ff_layout_async_handle_error_v3(task, lseg, idx);
+ case 4:
+ return ff_layout_async_handle_error_v4(task, state, clp,
+ lseg, idx);
+ default:
+ /* should never happen */
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+}
+
+static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
+ u32 idx, 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 -ENETUNREACH:
+ case -EADDRINUSE:
+ case -ENOBUFS:
+ case -EPIPE:
+ case -EPERM:
+ *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, offset, length, status, opnum,
+ GFP_NOIO);
+
+ switch (status) {
+ case NFS4ERR_DELAY:
+ case NFS4ERR_GRACE:
+ break;
+ case NFS4ERR_NXIO:
+ ff_layout_mark_ds_unreachable(lseg, idx);
+ /*
+ * Don't return the layout if this is a read and we still
+ * have layouts to try
+ */
+ 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);
+}
+
+/* NFS_PROTO call done callback routines */
+static int ff_layout_read_done_cb(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ int err;
+
+ if (task->tk_status < 0) {
+ ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
+ hdr->args.offset, hdr->args.count,
+ &hdr->res.op_status, OP_READ,
+ task->tk_status);
+ trace_ff_layout_read_error(hdr);
+ }
+
+ err = ff_layout_async_handle_error(task, hdr->args.context->state,
+ hdr->ds_clp, hdr->lseg,
+ hdr->pgio_mirror_idx);
+
+ 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;
+ }
+
+ 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);
+}
+
+/*
+ * We reference the rpc_cred of the first WRITE that triggers the need for
+ * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
+ * rfc5661 is not clear about which credential should be used.
+ *
+ * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
+ * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
+ * we always send layoutcommit after DS writes.
+ */
+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)
+{
+ if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
+ return;
+ nfs4_ff_layout_stat_io_start_read(hdr->inode,
+ FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
+ hdr->args.count,
+ task->tk_start);
+}
+
+static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
+ return;
+ nfs4_ff_layout_stat_io_end_read(task,
+ FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
+ 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;
+ }
+
+ ff_layout_read_record_layoutstats_start(task, hdr);
+ return 0;
+}
+
+/*
+ * Call ops for the async read/write cases
+ * In the case of dense layouts, the offset needs to be reset to its
+ * original value.
+ */
+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;
+
+ dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
+
+ if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
+ task->tk_status == 0) {
+ nfs4_sequence_done(task, &hdr->res.seq_res);
+ return;
+ }
+
+ /* Note this may cause RPC to be resent */
+ 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)
+{
+ loff_t end_offs = 0;
+ int err;
+
+ if (task->tk_status < 0) {
+ ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
+ hdr->args.offset, hdr->args.count,
+ &hdr->res.op_status, OP_WRITE,
+ task->tk_status);
+ trace_ff_layout_write_error(hdr);
+ }
+
+ err = ff_layout_async_handle_error(task, hdr->args.context->state,
+ hdr->ds_clp, hdr->lseg,
+ hdr->pgio_mirror_idx);
+
+ 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;
+ }
+
+ 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;
+
+ /* Note: if the write is unstable, don't set end_offs until commit */
+ ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
+
+ /* zero out fattr since we don't care DS attr at all */
+ 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;
+
+ if (task->tk_status < 0) {
+ ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
+ data->args.offset, data->args.count,
+ &data->res.op_status, OP_COMMIT,
+ task->tk_status);
+ trace_ff_layout_commit_error(data);
+ }
+
+ err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
+ data->lseg, data->ds_commit_index);
+
+ 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;
+ }
+
+ 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)
+{
+ if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
+ return;
+ nfs4_ff_layout_stat_io_start_write(hdr->inode,
+ FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
+ hdr->args.count,
+ task->tk_start);
+}
+
+static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
+ return;
+ nfs4_ff_layout_stat_io_end_write(task,
+ FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
+ 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;
+ }
+
+ 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;
+ }
+
+ /* Note this may cause RPC to be resent */
+ 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)
+{
+ if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
+ return;
+ nfs4_ff_layout_stat_io_start_write(cdata->inode,
+ FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
+ 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;
+
+ 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;
+ }
+ nfs4_ff_layout_stat_io_end_write(task,
+ FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
+ count, count, NFS_FILE_SYNC);
+ set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
+}
+
+static void ff_layout_commit_prepare_common(struct rpc_task *task,
+ struct nfs_commit_data *cdata)
+{
+ ff_layout_commit_record_layoutstats_start(task, cdata);
+}
+
+static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
+{
+ ff_layout_commit_prepare_common(task, data);
+ 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 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;
+
+ 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);
+ ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
+ if (!ds)
+ goto out_failed;
+
+ ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
+ hdr->inode);
+ if (IS_ERR(ds_clnt))
+ goto out_failed;
+
+ ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
+ if (!ds_cred)
+ goto out_failed;
+
+ vers = nfs4_ff_layout_ds_version(mirror);
+
+ 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);
+ if (fh)
+ hdr->args.fh = fh;
+
+ nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
+
+ /*
+ * Note that if we ever decide to split across DSes,
+ * then we may need to handle dense-like offsets.
+ */
+ hdr->args.offset = offset;
+ hdr->mds_offset = offset;
+
+ /* Perform an asynchronous read to ds */
+ 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);
+ put_cred(ds_cred);
+ return PNFS_ATTEMPTED;
+
+out_failed:
+ if (ff_layout_avoid_mds_available_ds(lseg))
+ 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;
+}
+
+/* Perform async writes. */
+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 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;
+
+ mirror = FF_LAYOUT_COMP(lseg, idx);
+ ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
+ if (!ds)
+ goto out_failed;
+
+ ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
+ hdr->inode);
+ if (IS_ERR(ds_clnt))
+ goto out_failed;
+
+ ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
+ if (!ds_cred)
+ goto out_failed;
+
+ vers = nfs4_ff_layout_ds_version(mirror);
+
+ 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 = idx;
+ fh = nfs4_ff_layout_select_ds_fh(mirror);
+ if (fh)
+ hdr->args.fh = fh;
+
+ nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
+
+ /*
+ * Note that if we ever decide to split across DSes,
+ * then we may need to handle dense-like offsets.
+ */
+ hdr->args.offset = offset;
+
+ /* Perform an asynchronous write */
+ 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);
+ put_cred(ds_cred);
+ return PNFS_ATTEMPTED;
+
+out_failed:
+ if (ff_layout_avoid_mds_available_ds(lseg))
+ 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 u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
+{
+ return i;
+}
+
+static struct nfs_fh *
+select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
+{
+ struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
+
+ /* FIXME: Assume that there is only one NFS version available
+ * for the DS.
+ */
+ return &flseg->mirror_array[i]->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 nfs4_ff_layout_mirror *mirror;
+ const struct cred *ds_cred;
+ u32 idx;
+ 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_ds_index_from_commit(lseg, data->ds_commit_index);
+ mirror = FF_LAYOUT_COMP(lseg, idx);
+ ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
+ if (!ds)
+ goto out_err;
+
+ ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
+ data->inode);
+ if (IS_ERR(ds_clnt))
+ goto out_err;
+
+ ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
+ if (!ds_cred)
+ goto out_err;
+
+ vers = nfs4_ff_layout_ds_version(mirror);
+
+ 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, data->ds_commit_index);
+ if (fh)
+ data->args.fh = fh;
+
+ 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);
+ 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 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;
+
+ new = pnfs_alloc_commit_array(flseg->mirror_array_cnt, GFP_NOIO);
+ 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);
+ /* This assume we always return _ALL_ layouts */
+ return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
+}
+
+static void
+encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
+{
+ WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
+}
+
+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);
+}
+
+/* report nothing for now */
+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(sizeof(*ff_args), GFP_KERNEL);
+ if (!ff_args)
+ goto out_nomem;
+ ff_args->pages[0] = alloc_page(GFP_KERNEL);
+ 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));
+ 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_array(NFS42_LAYOUTERROR_MAX,
+ sizeof(*errors), GFP_NOFS);
+ 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;
+
+ /*
+ * RFC 4291, Section 2.2.2
+ *
+ * Shorthanded ANY address
+ */
+ if (ipv6_addr_any(addr))
+ return snprintf(buf, buflen, "::");
+
+ /*
+ * RFC 4291, Section 2.2.2
+ *
+ * Shorthanded loopback address
+ */
+ if (ipv6_addr_loopback(addr))
+ return snprintf(buf, buflen, "::1");
+
+ /*
+ * RFC 4291, Section 2.2.3
+ *
+ * Special presentation address format for mapped v4
+ * addresses.
+ */
+ if (ipv6_addr_v4mapped(addr))
+ return snprintf(buf, buflen, "::ffff:%pI4",
+ &addr->s6_addr32[3]);
+
+ /*
+ * RFC 4291, Section 2.2.1
+ */
+ return snprintf(buf, buflen, "%pI6c", addr);
+}
+
+/* Derived from rpc_sockaddr2uaddr */
+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];
+ char *netid;
+ 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);
+ netid = "tcp";
+ netid_len = 3;
+ break;
+ case AF_INET6:
+ if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
+ return;
+ port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
+ netid = "tcp6";
+ netid_len = 4;
+ break;
+ default:
+ /* we only support tcp and tcp6 */
+ WARN_ON_ONCE(1);
+ return;
+ }
+
+ snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
+ len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
+
+ p = xdr_reserve_space(xdr, 4 + netid_len);
+ xdr_encode_opaque(p, 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_mirror *mirror)
+{
+ struct nfs4_pnfs_ds_addr *da;
+ struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
+ struct nfs_fh *fh = &mirror->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);
+ /* netaddr4 */
+ ff_layout_encode_netaddr(xdr, da);
+ /* nfs_fh4 */
+ p = xdr_reserve_space(xdr, 4 + fh->size);
+ xdr_encode_opaque(p, fh->data, fh->size);
+ /* ff_io_latency4 read */
+ spin_lock(&mirror->lock);
+ ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
+ /* ff_io_latency4 write */
+ ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
+ spin_unlock(&mirror->lock);
+ /* nfstime4 */
+ ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
+ /* bool */
+ 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;
+
+ /* layoutupdate length */
+ 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_mirror *mirror = opaque->data;
+
+ 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)
+{
+ struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs4_deviceid_node *dev;
+ int i = 0;
+
+ list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
+ if (i >= dev_limit)
+ break;
+ if (IS_ERR_OR_NULL(mirror->mirror_ds))
+ continue;
+ if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
+ continue;
+ /* mirror refcount put in cleanup_layoutstats */
+ if (!refcount_inc_not_zero(&mirror->ref))
+ continue;
+ dev = &mirror->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 = mirror->read_stat.io_stat.ops_completed;
+ devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
+ devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
+ devinfo->write_bytes = mirror->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;
+
+ devinfo++;
+ i++;
+ }
+ return i;
+}
+
+static int
+ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
+{
+ struct nfs4_flexfile_layout *ff_layout;
+ const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
+
+ /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
+ args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
+ if (!args->devinfo)
+ return -ENOMEM;
+
+ spin_lock(&args->inode->i_lock);
+ ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
+ args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
+ &args->devinfo[0], dev_count);
+ 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;
+#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, /* 1 page or so... */
+ .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,
+};
+
+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. ");
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h
new file mode 100644
index 000000000..354a031c6
--- /dev/null
+++ b/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -0,0 +1,226 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NFSv4 flexfile layout driver data structures.
+ *
+ * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
+ *
+ * Tao Peng <bergwolf@primarydata.com>
+ */
+
+#ifndef FS_NFS_NFS4FLEXFILELAYOUT_H
+#define FS_NFS_NFS4FLEXFILELAYOUT_H
+
+#define FF_FLAGS_NO_LAYOUTCOMMIT 1
+#define FF_FLAGS_NO_IO_THRU_MDS 2
+#define FF_FLAGS_NO_READ_IO 4
+
+#include <linux/refcount.h>
+#include "../pnfs.h"
+
+/* XXX: Let's filter out insanely large mirror count for now to avoid oom
+ * due to network error etc. */
+#define NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT 4096
+
+/* LAYOUTSTATS report interval in ms */
+#define FF_LAYOUTSTATS_REPORT_INTERVAL (60000L)
+#define FF_LAYOUTSTATS_MAXDEV 4
+
+struct nfs4_ff_ds_version {
+ u32 version;
+ u32 minor_version;
+ u32 rsize;
+ u32 wsize;
+ bool tightly_coupled;
+};
+
+/* chained in global deviceid hlist */
+struct nfs4_ff_layout_ds {
+ struct nfs4_deviceid_node id_node;
+ u32 ds_versions_cnt;
+ struct nfs4_ff_ds_version *ds_versions;
+ struct nfs4_pnfs_ds *ds;
+};
+
+struct nfs4_ff_layout_ds_err {
+ struct list_head list; /* linked in mirror error_list */
+ u64 offset;
+ u64 length;
+ int status;
+ enum nfs_opnum4 opnum;
+ nfs4_stateid stateid;
+ struct nfs4_deviceid deviceid;
+};
+
+struct nfs4_ff_io_stat {
+ __u64 ops_requested;
+ __u64 bytes_requested;
+ __u64 ops_completed;
+ __u64 bytes_completed;
+ __u64 bytes_not_delivered;
+ ktime_t total_busy_time;
+ ktime_t aggregate_completion_time;
+};
+
+struct nfs4_ff_busy_timer {
+ ktime_t start_time;
+ atomic_t n_ops;
+};
+
+struct nfs4_ff_layoutstat {
+ struct nfs4_ff_io_stat io_stat;
+ struct nfs4_ff_busy_timer busy_timer;
+};
+
+struct nfs4_ff_layout_mirror {
+ struct pnfs_layout_hdr *layout;
+ struct list_head mirrors;
+ u32 ds_count;
+ u32 efficiency;
+ struct nfs4_deviceid devid;
+ struct nfs4_ff_layout_ds *mirror_ds;
+ u32 fh_versions_cnt;
+ struct nfs_fh *fh_versions;
+ nfs4_stateid stateid;
+ const struct cred __rcu *ro_cred;
+ const struct cred __rcu *rw_cred;
+ refcount_t ref;
+ spinlock_t lock;
+ unsigned long flags;
+ struct nfs4_ff_layoutstat read_stat;
+ struct nfs4_ff_layoutstat write_stat;
+ ktime_t start_time;
+ u32 report_interval;
+};
+
+#define NFS4_FF_MIRROR_STAT_AVAIL (0)
+
+struct nfs4_ff_layout_segment {
+ struct pnfs_layout_segment generic_hdr;
+ u64 stripe_unit;
+ u32 flags;
+ u32 mirror_array_cnt;
+ struct nfs4_ff_layout_mirror *mirror_array[];
+};
+
+struct nfs4_flexfile_layout {
+ struct pnfs_layout_hdr generic_hdr;
+ struct pnfs_ds_commit_info commit_info;
+ struct list_head mirrors;
+ struct list_head error_list; /* nfs4_ff_layout_ds_err */
+ ktime_t last_report_time; /* Layoutstat report times */
+};
+
+struct nfs4_flexfile_layoutreturn_args {
+ struct list_head errors;
+ struct nfs42_layoutstat_devinfo devinfo[FF_LAYOUTSTATS_MAXDEV];
+ unsigned int num_errors;
+ unsigned int num_dev;
+ struct page *pages[1];
+};
+
+static inline struct nfs4_flexfile_layout *
+FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
+{
+ return container_of(lo, struct nfs4_flexfile_layout, generic_hdr);
+}
+
+static inline struct nfs4_ff_layout_segment *
+FF_LAYOUT_LSEG(struct pnfs_layout_segment *lseg)
+{
+ return container_of(lseg,
+ struct nfs4_ff_layout_segment,
+ generic_hdr);
+}
+
+static inline struct nfs4_ff_layout_ds *
+FF_LAYOUT_MIRROR_DS(struct nfs4_deviceid_node *node)
+{
+ return container_of(node, struct nfs4_ff_layout_ds, id_node);
+}
+
+static inline struct nfs4_ff_layout_mirror *
+FF_LAYOUT_COMP(struct pnfs_layout_segment *lseg, u32 idx)
+{
+ struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
+
+ if (idx < fls->mirror_array_cnt)
+ return fls->mirror_array[idx];
+ return NULL;
+}
+
+static inline struct nfs4_deviceid_node *
+FF_LAYOUT_DEVID_NODE(struct pnfs_layout_segment *lseg, u32 idx)
+{
+ struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, idx);
+
+ if (mirror != NULL) {
+ struct nfs4_ff_layout_ds *mirror_ds = mirror->mirror_ds;
+
+ if (!IS_ERR_OR_NULL(mirror_ds))
+ return &mirror_ds->id_node;
+ }
+ return NULL;
+}
+
+static inline u32
+FF_LAYOUT_MIRROR_COUNT(struct pnfs_layout_segment *lseg)
+{
+ return FF_LAYOUT_LSEG(lseg)->mirror_array_cnt;
+}
+
+static inline bool
+ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg)
+{
+ return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS;
+}
+
+static inline bool
+ff_layout_no_read_on_rw(struct pnfs_layout_segment *lseg)
+{
+ return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_READ_IO;
+}
+
+static inline int
+nfs4_ff_layout_ds_version(const struct nfs4_ff_layout_mirror *mirror)
+{
+ return mirror->mirror_ds->ds_versions[0].version;
+}
+
+struct nfs4_ff_layout_ds *
+nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
+ gfp_t gfp_flags);
+void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
+void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds);
+int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
+ struct nfs4_ff_layout_mirror *mirror, u64 offset,
+ u64 length, int status, enum nfs_opnum4 opnum,
+ gfp_t gfp_flags);
+void ff_layout_send_layouterror(struct pnfs_layout_segment *lseg);
+int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head);
+void ff_layout_free_ds_ioerr(struct list_head *head);
+unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
+ const struct pnfs_layout_range *range,
+ struct list_head *head,
+ unsigned int maxnum);
+struct nfs_fh *
+nfs4_ff_layout_select_ds_fh(struct nfs4_ff_layout_mirror *mirror);
+void
+nfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror,
+ nfs4_stateid *stateid);
+
+struct nfs4_pnfs_ds *
+nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
+ struct nfs4_ff_layout_mirror *mirror,
+ bool fail_return);
+
+struct rpc_clnt *
+nfs4_ff_find_or_create_ds_client(struct nfs4_ff_layout_mirror *mirror,
+ struct nfs_client *ds_clp,
+ struct inode *inode);
+const struct cred *ff_layout_get_ds_cred(struct nfs4_ff_layout_mirror *mirror,
+ const struct pnfs_layout_range *range,
+ const struct cred *mdscred);
+bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg);
+bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg);
+
+#endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */
diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
new file mode 100644
index 000000000..1f1229710
--- /dev/null
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -0,0 +1,619 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device operations for the pnfs nfs4 file layout driver.
+ *
+ * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
+ *
+ * Tao Peng <bergwolf@primarydata.com>
+ */
+
+#include <linux/nfs_fs.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/sunrpc/addr.h>
+
+#include "../internal.h"
+#include "../nfs4session.h"
+#include "flexfilelayout.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+static unsigned int dataserver_timeo = NFS_DEF_TCP_TIMEO;
+static unsigned int dataserver_retrans;
+
+static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
+
+void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
+{
+ if (!IS_ERR_OR_NULL(mirror_ds))
+ nfs4_put_deviceid_node(&mirror_ds->id_node);
+}
+
+void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
+{
+ nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
+ nfs4_pnfs_ds_put(mirror_ds->ds);
+ kfree(mirror_ds->ds_versions);
+ kfree_rcu(mirror_ds, id_node.rcu);
+}
+
+/* Decode opaque device data and construct new_ds using it */
+struct nfs4_ff_layout_ds *
+nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
+ gfp_t gfp_flags)
+{
+ struct xdr_stream stream;
+ struct xdr_buf buf;
+ struct page *scratch;
+ struct list_head dsaddrs;
+ struct nfs4_pnfs_ds_addr *da;
+ struct nfs4_ff_layout_ds *new_ds = NULL;
+ struct nfs4_ff_ds_version *ds_versions = NULL;
+ u32 mp_count;
+ u32 version_count;
+ __be32 *p;
+ int i, ret = -ENOMEM;
+
+ /* set up xdr stream */
+ scratch = alloc_page(gfp_flags);
+ if (!scratch)
+ goto out_err;
+
+ new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
+ if (!new_ds)
+ goto out_scratch;
+
+ nfs4_init_deviceid_node(&new_ds->id_node,
+ server,
+ &pdev->dev_id);
+ INIT_LIST_HEAD(&dsaddrs);
+
+ xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
+ xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
+
+ /* multipath count */
+ p = xdr_inline_decode(&stream, 4);
+ if (unlikely(!p))
+ goto out_err_drain_dsaddrs;
+ mp_count = be32_to_cpup(p);
+ dprintk("%s: multipath ds count %d\n", __func__, mp_count);
+
+ for (i = 0; i < mp_count; i++) {
+ /* multipath ds */
+ da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
+ &stream, gfp_flags);
+ if (da)
+ list_add_tail(&da->da_node, &dsaddrs);
+ }
+ if (list_empty(&dsaddrs)) {
+ dprintk("%s: no suitable DS addresses found\n",
+ __func__);
+ ret = -ENOMEDIUM;
+ goto out_err_drain_dsaddrs;
+ }
+
+ /* version count */
+ p = xdr_inline_decode(&stream, 4);
+ if (unlikely(!p))
+ goto out_err_drain_dsaddrs;
+ version_count = be32_to_cpup(p);
+ dprintk("%s: version count %d\n", __func__, version_count);
+
+ ds_versions = kcalloc(version_count,
+ sizeof(struct nfs4_ff_ds_version),
+ gfp_flags);
+ if (!ds_versions)
+ goto out_scratch;
+
+ for (i = 0; i < version_count; i++) {
+ /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
+ * tightly_coupled(4) */
+ p = xdr_inline_decode(&stream, 20);
+ if (unlikely(!p))
+ goto out_err_drain_dsaddrs;
+ ds_versions[i].version = be32_to_cpup(p++);
+ ds_versions[i].minor_version = be32_to_cpup(p++);
+ ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
+ ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
+ ds_versions[i].tightly_coupled = be32_to_cpup(p);
+
+ if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
+ ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
+ if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
+ ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
+
+ /*
+ * check for valid major/minor combination.
+ * currently we support dataserver which talk:
+ * v3, v4.0, v4.1, v4.2
+ */
+ if (!((ds_versions[i].version == 3 && ds_versions[i].minor_version == 0) ||
+ (ds_versions[i].version == 4 && ds_versions[i].minor_version < 3))) {
+ dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
+ i, ds_versions[i].version,
+ ds_versions[i].minor_version);
+ ret = -EPROTONOSUPPORT;
+ goto out_err_drain_dsaddrs;
+ }
+
+ dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
+ __func__, i, ds_versions[i].version,
+ ds_versions[i].minor_version,
+ ds_versions[i].rsize,
+ ds_versions[i].wsize,
+ ds_versions[i].tightly_coupled);
+ }
+
+ new_ds->ds_versions = ds_versions;
+ new_ds->ds_versions_cnt = version_count;
+
+ new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
+ if (!new_ds->ds)
+ goto out_err_drain_dsaddrs;
+
+ /* If DS was already in cache, free ds addrs */
+ while (!list_empty(&dsaddrs)) {
+ da = list_first_entry(&dsaddrs,
+ struct nfs4_pnfs_ds_addr,
+ da_node);
+ list_del_init(&da->da_node);
+ kfree(da->da_remotestr);
+ kfree(da);
+ }
+
+ __free_page(scratch);
+ return new_ds;
+
+out_err_drain_dsaddrs:
+ while (!list_empty(&dsaddrs)) {
+ da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
+ da_node);
+ list_del_init(&da->da_node);
+ kfree(da->da_remotestr);
+ kfree(da);
+ }
+
+ kfree(ds_versions);
+out_scratch:
+ __free_page(scratch);
+out_err:
+ kfree(new_ds);
+
+ dprintk("%s ERROR: returning %d\n", __func__, ret);
+ return NULL;
+}
+
+static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
+ u64 offset, u64 length)
+{
+ u64 end;
+
+ end = max_t(u64, pnfs_end_offset(err->offset, err->length),
+ pnfs_end_offset(offset, length));
+ err->offset = min_t(u64, err->offset, offset);
+ err->length = end - err->offset;
+}
+
+static int
+ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,
+ const struct nfs4_ff_layout_ds_err *e2)
+{
+ int ret;
+
+ if (e1->opnum != e2->opnum)
+ return e1->opnum < e2->opnum ? -1 : 1;
+ if (e1->status != e2->status)
+ return e1->status < e2->status ? -1 : 1;
+ ret = memcmp(e1->stateid.data, e2->stateid.data,
+ sizeof(e1->stateid.data));
+ if (ret != 0)
+ return ret;
+ ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
+ if (ret != 0)
+ return ret;
+ if (pnfs_end_offset(e1->offset, e1->length) < e2->offset)
+ return -1;
+ if (e1->offset > pnfs_end_offset(e2->offset, e2->length))
+ return 1;
+ /* If ranges overlap or are contiguous, they are the same */
+ return 0;
+}
+
+static void
+ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
+ struct nfs4_ff_layout_ds_err *dserr)
+{
+ struct nfs4_ff_layout_ds_err *err, *tmp;
+ struct list_head *head = &flo->error_list;
+ int match;
+
+ /* Do insertion sort w/ merges */
+ list_for_each_entry_safe(err, tmp, &flo->error_list, list) {
+ match = ff_ds_error_match(err, dserr);
+ if (match < 0)
+ continue;
+ if (match > 0) {
+ /* Add entry "dserr" _before_ entry "err" */
+ head = &err->list;
+ break;
+ }
+ /* Entries match, so merge "err" into "dserr" */
+ extend_ds_error(dserr, err->offset, err->length);
+ list_replace(&err->list, &dserr->list);
+ kfree(err);
+ return;
+ }
+
+ list_add_tail(&dserr->list, head);
+}
+
+int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
+ struct nfs4_ff_layout_mirror *mirror, u64 offset,
+ u64 length, int status, enum nfs_opnum4 opnum,
+ gfp_t gfp_flags)
+{
+ struct nfs4_ff_layout_ds_err *dserr;
+
+ if (status == 0)
+ return 0;
+
+ if (IS_ERR_OR_NULL(mirror->mirror_ds))
+ return -EINVAL;
+
+ dserr = kmalloc(sizeof(*dserr), gfp_flags);
+ if (!dserr)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&dserr->list);
+ dserr->offset = offset;
+ dserr->length = length;
+ dserr->status = status;
+ dserr->opnum = opnum;
+ nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
+ memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
+ NFS4_DEVICEID4_SIZE);
+
+ spin_lock(&flo->generic_hdr.plh_inode->i_lock);
+ ff_layout_add_ds_error_locked(flo, dserr);
+ spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
+ return 0;
+}
+
+static const struct cred *
+ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
+{
+ const struct cred *cred, __rcu **pcred;
+
+ if (iomode == IOMODE_READ)
+ pcred = &mirror->ro_cred;
+ else
+ pcred = &mirror->rw_cred;
+
+ rcu_read_lock();
+ do {
+ cred = rcu_dereference(*pcred);
+ if (!cred)
+ break;
+
+ cred = get_cred_rcu(cred);
+ } while(!cred);
+ rcu_read_unlock();
+ return cred;
+}
+
+struct nfs_fh *
+nfs4_ff_layout_select_ds_fh(struct nfs4_ff_layout_mirror *mirror)
+{
+ /* FIXME: For now assume there is only 1 version available for the DS */
+ return &mirror->fh_versions[0];
+}
+
+void
+nfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror,
+ nfs4_stateid *stateid)
+{
+ if (nfs4_ff_layout_ds_version(mirror) == 4)
+ nfs4_stateid_copy(stateid, &mirror->stateid);
+}
+
+static bool
+ff_layout_init_mirror_ds(struct pnfs_layout_hdr *lo,
+ struct nfs4_ff_layout_mirror *mirror)
+{
+ if (mirror == NULL)
+ goto outerr;
+ if (mirror->mirror_ds == NULL) {
+ struct nfs4_deviceid_node *node;
+ struct nfs4_ff_layout_ds *mirror_ds = ERR_PTR(-ENODEV);
+
+ node = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode),
+ &mirror->devid, lo->plh_lc_cred,
+ GFP_KERNEL);
+ if (node)
+ mirror_ds = FF_LAYOUT_MIRROR_DS(node);
+
+ /* check for race with another call to this function */
+ if (cmpxchg(&mirror->mirror_ds, NULL, mirror_ds) &&
+ mirror_ds != ERR_PTR(-ENODEV))
+ nfs4_put_deviceid_node(node);
+ }
+
+ if (IS_ERR(mirror->mirror_ds))
+ goto outerr;
+
+ return true;
+outerr:
+ return false;
+}
+
+/**
+ * nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
+ * @lseg: the layout segment we're operating on
+ * @mirror: layout mirror describing the DS to use
+ * @fail_return: return layout on connect failure?
+ *
+ * Try to prepare a DS connection to accept an RPC call. This involves
+ * selecting a mirror to use and connecting the client to it if it's not
+ * already connected.
+ *
+ * Since we only need a single functioning mirror to satisfy a read, we don't
+ * want to return the layout if there is one. For writes though, any down
+ * mirror should result in a LAYOUTRETURN. @fail_return is how we distinguish
+ * between the two cases.
+ *
+ * Returns a pointer to a connected DS object on success or NULL on failure.
+ */
+struct nfs4_pnfs_ds *
+nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
+ struct nfs4_ff_layout_mirror *mirror,
+ bool fail_return)
+{
+ struct nfs4_pnfs_ds *ds = NULL;
+ struct inode *ino = lseg->pls_layout->plh_inode;
+ struct nfs_server *s = NFS_SERVER(ino);
+ unsigned int max_payload;
+ int status;
+
+ if (!ff_layout_init_mirror_ds(lseg->pls_layout, mirror))
+ goto noconnect;
+
+ ds = mirror->mirror_ds->ds;
+ if (READ_ONCE(ds->ds_clp))
+ goto out;
+ /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
+ smp_rmb();
+
+ /* FIXME: For now we assume the server sent only one version of NFS
+ * to use for the DS.
+ */
+ status = nfs4_pnfs_ds_connect(s, ds, &mirror->mirror_ds->id_node,
+ dataserver_timeo, dataserver_retrans,
+ mirror->mirror_ds->ds_versions[0].version,
+ mirror->mirror_ds->ds_versions[0].minor_version);
+
+ /* connect success, check rsize/wsize limit */
+ if (!status) {
+ max_payload =
+ nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
+ NULL);
+ if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
+ mirror->mirror_ds->ds_versions[0].rsize = max_payload;
+ if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
+ mirror->mirror_ds->ds_versions[0].wsize = max_payload;
+ goto out;
+ }
+noconnect:
+ ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
+ mirror, lseg->pls_range.offset,
+ lseg->pls_range.length, NFS4ERR_NXIO,
+ OP_ILLEGAL, GFP_NOIO);
+ ff_layout_send_layouterror(lseg);
+ if (fail_return || !ff_layout_has_available_ds(lseg))
+ pnfs_error_mark_layout_for_return(ino, lseg);
+ ds = NULL;
+out:
+ return ds;
+}
+
+const struct cred *
+ff_layout_get_ds_cred(struct nfs4_ff_layout_mirror *mirror,
+ const struct pnfs_layout_range *range,
+ const struct cred *mdscred)
+{
+ const struct cred *cred;
+
+ if (mirror && !mirror->mirror_ds->ds_versions[0].tightly_coupled) {
+ cred = ff_layout_get_mirror_cred(mirror, range->iomode);
+ if (!cred)
+ cred = get_cred(mdscred);
+ } else {
+ cred = get_cred(mdscred);
+ }
+ return cred;
+}
+
+/**
+ * nfs4_ff_find_or_create_ds_client - Find or create a DS rpc client
+ * @mirror: pointer to the mirror
+ * @ds_clp: nfs_client for the DS
+ * @inode: pointer to inode
+ *
+ * Find or create a DS rpc client with th MDS server rpc client auth flavor
+ * in the nfs_client cl_ds_clients list.
+ */
+struct rpc_clnt *
+nfs4_ff_find_or_create_ds_client(struct nfs4_ff_layout_mirror *mirror,
+ struct nfs_client *ds_clp, struct inode *inode)
+{
+ switch (mirror->mirror_ds->ds_versions[0].version) {
+ case 3:
+ /* For NFSv3 DS, flavor is set when creating DS connections */
+ return ds_clp->cl_rpcclient;
+ case 4:
+ return nfs4_find_or_create_ds_client(ds_clp, inode);
+ default:
+ BUG();
+ }
+}
+
+void ff_layout_free_ds_ioerr(struct list_head *head)
+{
+ struct nfs4_ff_layout_ds_err *err;
+
+ while (!list_empty(head)) {
+ err = list_first_entry(head,
+ struct nfs4_ff_layout_ds_err,
+ list);
+ list_del(&err->list);
+ kfree(err);
+ }
+}
+
+/* called with inode i_lock held */
+int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head)
+{
+ struct nfs4_ff_layout_ds_err *err;
+ __be32 *p;
+
+ list_for_each_entry(err, head, list) {
+ /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE)
+ * + array length + deviceid(NFS4_DEVICEID4_SIZE)
+ * + status(4) + opnum(4)
+ */
+ p = xdr_reserve_space(xdr,
+ 28 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE);
+ if (unlikely(!p))
+ return -ENOBUFS;
+ p = xdr_encode_hyper(p, err->offset);
+ p = xdr_encode_hyper(p, err->length);
+ p = xdr_encode_opaque_fixed(p, &err->stateid,
+ NFS4_STATEID_SIZE);
+ /* Encode 1 error */
+ *p++ = cpu_to_be32(1);
+ p = xdr_encode_opaque_fixed(p, &err->deviceid,
+ NFS4_DEVICEID4_SIZE);
+ *p++ = cpu_to_be32(err->status);
+ *p++ = cpu_to_be32(err->opnum);
+ dprintk("%s: offset %llu length %llu status %d op %d\n",
+ __func__, err->offset, err->length, err->status,
+ err->opnum);
+ }
+
+ return 0;
+}
+
+static
+unsigned int do_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
+ const struct pnfs_layout_range *range,
+ struct list_head *head,
+ unsigned int maxnum)
+{
+ struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
+ struct inode *inode = lo->plh_inode;
+ struct nfs4_ff_layout_ds_err *err, *n;
+ unsigned int ret = 0;
+
+ spin_lock(&inode->i_lock);
+ list_for_each_entry_safe(err, n, &flo->error_list, list) {
+ if (!pnfs_is_range_intersecting(err->offset,
+ pnfs_end_offset(err->offset, err->length),
+ range->offset,
+ pnfs_end_offset(range->offset, range->length)))
+ continue;
+ if (!maxnum)
+ break;
+ list_move(&err->list, head);
+ maxnum--;
+ ret++;
+ }
+ spin_unlock(&inode->i_lock);
+ return ret;
+}
+
+unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
+ const struct pnfs_layout_range *range,
+ struct list_head *head,
+ unsigned int maxnum)
+{
+ unsigned int ret;
+
+ ret = do_layout_fetch_ds_ioerr(lo, range, head, maxnum);
+ /* If we're over the max, discard all remaining entries */
+ if (ret == maxnum) {
+ LIST_HEAD(discard);
+ do_layout_fetch_ds_ioerr(lo, range, &discard, -1);
+ ff_layout_free_ds_ioerr(&discard);
+ }
+ return ret;
+}
+
+static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg)
+{
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs4_deviceid_node *devid;
+ u32 idx;
+
+ for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
+ mirror = FF_LAYOUT_COMP(lseg, idx);
+ if (mirror) {
+ if (!mirror->mirror_ds)
+ return true;
+ if (IS_ERR(mirror->mirror_ds))
+ continue;
+ devid = &mirror->mirror_ds->id_node;
+ if (!nfs4_test_deviceid_unavailable(devid))
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg)
+{
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs4_deviceid_node *devid;
+ u32 idx;
+
+ for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
+ mirror = FF_LAYOUT_COMP(lseg, idx);
+ if (!mirror || IS_ERR(mirror->mirror_ds))
+ return false;
+ if (!mirror->mirror_ds)
+ continue;
+ devid = &mirror->mirror_ds->id_node;
+ if (nfs4_test_deviceid_unavailable(devid))
+ return false;
+ }
+
+ return FF_LAYOUT_MIRROR_COUNT(lseg) != 0;
+}
+
+static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg)
+{
+ if (lseg->pls_range.iomode == IOMODE_READ)
+ return ff_read_layout_has_available_ds(lseg);
+ /* Note: RW layout needs all mirrors available */
+ return ff_rw_layout_has_available_ds(lseg);
+}
+
+bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg)
+{
+ return ff_layout_no_fallback_to_mds(lseg) ||
+ ff_layout_has_available_ds(lseg);
+}
+
+bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg)
+{
+ return lseg->pls_range.iomode == IOMODE_RW &&
+ ff_layout_no_read_on_rw(lseg);
+}
+
+module_param(dataserver_retrans, uint, 0644);
+MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client "
+ "retries a request before it attempts further "
+ " recovery action.");
+module_param(dataserver_timeo, uint, 0644);
+MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the "
+ "NFSv4.1 client waits for a response from a "
+ " data server before it retries an NFS request.");