2 * Module for pnfs flexfile layout driver.
4 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6 * Tao Peng <bergwolf@primarydata.com>
9 #include <linux/nfs_fs.h>
10 #include <linux/nfs_page.h>
11 #include <linux/module.h>
13 #include <linux/sunrpc/metrics.h>
15 #include "flexfilelayout.h"
16 #include "../nfs4session.h"
17 #include "../nfs4idmap.h"
18 #include "../internal.h"
19 #include "../delegation.h"
20 #include "../nfs4trace.h"
21 #include "../iostat.h"
25 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
27 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
29 static struct group_info *ff_zero_group;
31 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
32 struct nfs_pgio_header *hdr);
34 static struct pnfs_layout_hdr *
35 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
37 struct nfs4_flexfile_layout *ffl;
39 ffl = kzalloc(sizeof(*ffl), gfp_flags);
41 INIT_LIST_HEAD(&ffl->error_list);
42 INIT_LIST_HEAD(&ffl->mirrors);
43 ffl->last_report_time = ktime_get();
44 return &ffl->generic_hdr;
50 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
52 struct nfs4_ff_layout_ds_err *err, *n;
54 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
59 kfree(FF_LAYOUT_FROM_HDR(lo));
62 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
66 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
67 if (unlikely(p == NULL))
69 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
70 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
71 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
72 p[0], p[1], p[2], p[3]);
76 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
80 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
83 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
84 nfs4_print_deviceid(devid);
88 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
92 p = xdr_inline_decode(xdr, 4);
95 fh->size = be32_to_cpup(p++);
96 if (fh->size > NFS_MAXFHSIZE) {
97 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
102 p = xdr_inline_decode(xdr, fh->size);
105 memcpy(&fh->data, p, fh->size);
106 dprintk("%s: fh len %d\n", __func__, fh->size);
112 * Currently only stringified uids and gids are accepted.
113 * I.e., kerberos is not supported to the DSes, so no pricipals.
115 * That means that one common function will suffice, but when
116 * principals are added, this should be split to accomodate
117 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
120 decode_name(struct xdr_stream *xdr, u32 *id)
125 /* opaque_length(4)*/
126 p = xdr_inline_decode(xdr, 4);
129 len = be32_to_cpup(p++);
133 dprintk("%s: len %u\n", __func__, len);
136 p = xdr_inline_decode(xdr, len);
140 if (!nfs_map_string_to_numeric((char *)p, len, id))
146 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
147 const struct nfs4_ff_layout_mirror *m2)
151 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
153 for (i = 0; i < m1->fh_versions_cnt; i++) {
154 bool found_fh = false;
155 for (j = 0; j < m2->fh_versions_cnt; j++) {
156 if (nfs_compare_fh(&m1->fh_versions[i],
157 &m2->fh_versions[j]) == 0) {
168 static struct nfs4_ff_layout_mirror *
169 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
170 struct nfs4_ff_layout_mirror *mirror)
172 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
173 struct nfs4_ff_layout_mirror *pos;
174 struct inode *inode = lo->plh_inode;
176 spin_lock(&inode->i_lock);
177 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
178 if (mirror->mirror_ds != pos->mirror_ds)
180 if (!ff_mirror_match_fh(mirror, pos))
182 if (atomic_inc_not_zero(&pos->ref)) {
183 spin_unlock(&inode->i_lock);
187 list_add(&mirror->mirrors, &ff_layout->mirrors);
189 spin_unlock(&inode->i_lock);
194 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
197 if (mirror->layout == NULL)
199 inode = mirror->layout->plh_inode;
200 spin_lock(&inode->i_lock);
201 list_del(&mirror->mirrors);
202 spin_unlock(&inode->i_lock);
203 mirror->layout = NULL;
206 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
208 struct nfs4_ff_layout_mirror *mirror;
210 mirror = kzalloc(sizeof(*mirror), gfp_flags);
211 if (mirror != NULL) {
212 spin_lock_init(&mirror->lock);
213 atomic_set(&mirror->ref, 1);
214 INIT_LIST_HEAD(&mirror->mirrors);
219 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
221 struct rpc_cred *cred;
223 ff_layout_remove_mirror(mirror);
224 kfree(mirror->fh_versions);
225 cred = rcu_access_pointer(mirror->ro_cred);
228 cred = rcu_access_pointer(mirror->rw_cred);
231 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
235 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
237 if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
238 ff_layout_free_mirror(mirror);
241 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
245 if (fls->mirror_array) {
246 for (i = 0; i < fls->mirror_array_cnt; i++) {
247 /* normally mirror_ds is freed in
248 * .free_deviceid_node but we still do it here
249 * for .alloc_lseg error path */
250 ff_layout_put_mirror(fls->mirror_array[i]);
252 kfree(fls->mirror_array);
253 fls->mirror_array = NULL;
257 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
261 dprintk("--> %s\n", __func__);
263 /* FIXME: remove this check when layout segment support is added */
264 if (lgr->range.offset != 0 ||
265 lgr->range.length != NFS4_MAX_UINT64) {
266 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
271 dprintk("--> %s returns %d\n", __func__, ret);
275 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
278 ff_layout_free_mirror_array(fls);
284 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
285 const struct pnfs_layout_range *l2)
289 if (l1->iomode != l2->iomode)
290 return l1->iomode != IOMODE_READ;
291 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
292 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
293 if (end1 < l2->offset)
295 if (end2 < l1->offset)
297 return l2->offset <= l1->offset;
301 ff_lseg_merge(struct pnfs_layout_segment *new,
302 struct pnfs_layout_segment *old)
304 u64 new_end, old_end;
306 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
308 if (new->pls_range.iomode != old->pls_range.iomode)
310 old_end = pnfs_calc_offset_end(old->pls_range.offset,
311 old->pls_range.length);
312 if (old_end < new->pls_range.offset)
314 new_end = pnfs_calc_offset_end(new->pls_range.offset,
315 new->pls_range.length);
316 if (new_end < old->pls_range.offset)
319 /* Mergeable: copy info from 'old' to 'new' */
320 if (new_end < old_end)
322 if (new->pls_range.offset < old->pls_range.offset)
323 new->pls_range.offset = old->pls_range.offset;
324 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
326 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
327 set_bit(NFS_LSEG_ROC, &new->pls_flags);
332 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
333 struct pnfs_layout_segment *lseg,
334 struct list_head *free_me)
336 pnfs_generic_layout_insert_lseg(lo, lseg,
337 ff_lseg_range_is_after,
342 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
346 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
347 for (j = i + 1; j < fls->mirror_array_cnt; j++)
348 if (fls->mirror_array[i]->efficiency <
349 fls->mirror_array[j]->efficiency)
350 swap(fls->mirror_array[i],
351 fls->mirror_array[j]);
355 static void ff_layout_mark_devices_valid(struct nfs4_ff_layout_segment *fls)
357 struct nfs4_deviceid_node *node;
360 if (!(fls->flags & FF_FLAGS_NO_IO_THRU_MDS))
362 for (i = 0; i < fls->mirror_array_cnt; i++) {
363 node = &fls->mirror_array[i]->mirror_ds->id_node;
364 clear_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags);
368 static struct pnfs_layout_segment *
369 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
370 struct nfs4_layoutget_res *lgr,
373 struct pnfs_layout_segment *ret;
374 struct nfs4_ff_layout_segment *fls = NULL;
375 struct xdr_stream stream;
377 struct page *scratch;
379 u32 mirror_array_cnt;
383 dprintk("--> %s\n", __func__);
384 scratch = alloc_page(gfp_flags);
386 return ERR_PTR(-ENOMEM);
388 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
390 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
392 /* stripe unit and mirror_array_cnt */
394 p = xdr_inline_decode(&stream, 8 + 4);
398 p = xdr_decode_hyper(p, &stripe_unit);
399 mirror_array_cnt = be32_to_cpup(p++);
400 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
401 stripe_unit, mirror_array_cnt);
403 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
404 mirror_array_cnt == 0)
408 fls = kzalloc(sizeof(*fls), gfp_flags);
412 fls->mirror_array_cnt = mirror_array_cnt;
413 fls->stripe_unit = stripe_unit;
414 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
415 sizeof(fls->mirror_array[0]), gfp_flags);
416 if (fls->mirror_array == NULL)
419 for (i = 0; i < fls->mirror_array_cnt; i++) {
420 struct nfs4_ff_layout_mirror *mirror;
421 struct nfs4_deviceid devid;
422 struct nfs4_deviceid_node *idnode;
423 struct auth_cred acred = { .group_info = ff_zero_group };
424 struct rpc_cred __rcu *cred;
425 u32 ds_count, fh_count, id;
429 p = xdr_inline_decode(&stream, 4);
432 ds_count = be32_to_cpup(p);
434 /* FIXME: allow for striping? */
438 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
439 if (fls->mirror_array[i] == NULL) {
444 fls->mirror_array[i]->ds_count = ds_count;
447 rc = decode_deviceid(&stream, &devid);
451 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
452 &devid, lh->plh_lc_cred,
455 * upon success, mirror_ds is allocated by previous
456 * getdeviceinfo, or newly by .alloc_deviceid_node
457 * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
460 fls->mirror_array[i]->mirror_ds =
461 FF_LAYOUT_MIRROR_DS(idnode);
467 p = xdr_inline_decode(&stream, 4);
470 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
473 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
479 p = xdr_inline_decode(&stream, 4);
482 fh_count = be32_to_cpup(p);
484 fls->mirror_array[i]->fh_versions =
485 kzalloc(fh_count * sizeof(struct nfs_fh),
487 if (fls->mirror_array[i]->fh_versions == NULL) {
492 for (j = 0; j < fh_count; j++) {
493 rc = decode_nfs_fh(&stream,
494 &fls->mirror_array[i]->fh_versions[j]);
499 fls->mirror_array[i]->fh_versions_cnt = fh_count;
502 rc = decode_name(&stream, &id);
506 acred.uid = make_kuid(&init_user_ns, id);
509 rc = decode_name(&stream, &id);
513 acred.gid = make_kgid(&init_user_ns, id);
515 /* find the cred for it */
516 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
522 if (lgr->range.iomode == IOMODE_READ)
523 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
525 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
527 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
528 if (mirror != fls->mirror_array[i]) {
529 /* swap cred ptrs so free_mirror will clean up old */
530 if (lgr->range.iomode == IOMODE_READ) {
531 cred = xchg(&mirror->ro_cred, cred);
532 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
534 cred = xchg(&mirror->rw_cred, cred);
535 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
537 ff_layout_free_mirror(fls->mirror_array[i]);
538 fls->mirror_array[i] = mirror;
541 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
542 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
543 from_kuid(&init_user_ns, acred.uid),
544 from_kgid(&init_user_ns, acred.gid));
547 p = xdr_inline_decode(&stream, 4);
549 goto out_sort_mirrors;
550 fls->flags = be32_to_cpup(p);
552 p = xdr_inline_decode(&stream, 4);
554 goto out_sort_mirrors;
555 for (i=0; i < fls->mirror_array_cnt; i++)
556 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
559 ff_layout_sort_mirrors(fls);
560 rc = ff_layout_check_layout(lgr);
563 ff_layout_mark_devices_valid(fls);
565 ret = &fls->generic_hdr;
566 dprintk("<-- %s (success)\n", __func__);
568 __free_page(scratch);
571 _ff_layout_free_lseg(fls);
573 dprintk("<-- %s (%d)\n", __func__, rc);
577 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
579 struct pnfs_layout_segment *lseg;
581 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
582 if (lseg->pls_range.iomode == IOMODE_RW)
589 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
591 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
593 dprintk("--> %s\n", __func__);
595 if (lseg->pls_range.iomode == IOMODE_RW) {
596 struct nfs4_flexfile_layout *ffl;
599 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
600 inode = ffl->generic_hdr.plh_inode;
601 spin_lock(&inode->i_lock);
602 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
603 ffl->commit_info.nbuckets = 0;
604 kfree(ffl->commit_info.buckets);
605 ffl->commit_info.buckets = NULL;
607 spin_unlock(&inode->i_lock);
609 _ff_layout_free_lseg(fls);
612 /* Return 1 until we have multiple lsegs support */
614 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
620 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
622 /* first IO request? */
623 if (atomic_inc_return(&timer->n_ops) == 1) {
624 timer->start_time = now;
629 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
633 if (atomic_dec_return(&timer->n_ops) < 0)
636 start = timer->start_time;
637 timer->start_time = now;
638 return ktime_sub(now, start);
642 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
643 struct nfs4_ff_layoutstat *layoutstat,
646 static const ktime_t notime = {0};
647 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
648 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
650 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
651 if (ktime_equal(mirror->start_time, notime))
652 mirror->start_time = now;
653 if (mirror->report_interval != 0)
654 report_interval = (s64)mirror->report_interval * 1000LL;
655 else if (layoutstats_timer != 0)
656 report_interval = (s64)layoutstats_timer * 1000LL;
657 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
659 ffl->last_report_time = now;
667 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
670 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
672 iostat->ops_requested++;
673 iostat->bytes_requested += requested;
677 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
680 ktime_t time_completed,
681 ktime_t time_started)
683 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
684 ktime_t completion_time = ktime_sub(time_completed, time_started);
687 iostat->ops_completed++;
688 iostat->bytes_completed += completed;
689 iostat->bytes_not_delivered += requested - completed;
691 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
692 iostat->total_busy_time =
693 ktime_add(iostat->total_busy_time, timer);
694 iostat->aggregate_completion_time =
695 ktime_add(iostat->aggregate_completion_time,
700 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
701 struct nfs4_ff_layout_mirror *mirror,
702 __u64 requested, ktime_t now)
706 spin_lock(&mirror->lock);
707 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
708 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
709 spin_unlock(&mirror->lock);
712 pnfs_report_layoutstat(inode, GFP_KERNEL);
716 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
717 struct nfs4_ff_layout_mirror *mirror,
721 spin_lock(&mirror->lock);
722 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
723 requested, completed,
724 ktime_get(), task->tk_start);
725 spin_unlock(&mirror->lock);
729 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
730 struct nfs4_ff_layout_mirror *mirror,
731 __u64 requested, ktime_t now)
735 spin_lock(&mirror->lock);
736 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
737 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
738 spin_unlock(&mirror->lock);
741 pnfs_report_layoutstat(inode, GFP_NOIO);
745 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
746 struct nfs4_ff_layout_mirror *mirror,
749 enum nfs3_stable_how committed)
751 if (committed == NFS_UNSTABLE)
752 requested = completed = 0;
754 spin_lock(&mirror->lock);
755 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
756 requested, completed, ktime_get(), task->tk_start);
757 spin_unlock(&mirror->lock);
761 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
762 struct nfs_commit_info *cinfo,
765 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
766 struct pnfs_commit_bucket *buckets;
769 if (cinfo->ds->nbuckets != 0) {
770 /* This assumes there is only one RW lseg per file.
771 * To support multiple lseg per file, we need to
772 * change struct pnfs_commit_bucket to allow dynamic
773 * increasing nbuckets.
778 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
780 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
787 spin_lock(&cinfo->inode->i_lock);
788 if (cinfo->ds->nbuckets != 0)
791 cinfo->ds->buckets = buckets;
792 cinfo->ds->nbuckets = size;
793 for (i = 0; i < size; i++) {
794 INIT_LIST_HEAD(&buckets[i].written);
795 INIT_LIST_HEAD(&buckets[i].committing);
796 /* mark direct verifier as unset */
797 buckets[i].direct_verf.committed =
798 NFS_INVALID_STABLE_HOW;
801 spin_unlock(&cinfo->inode->i_lock);
806 static struct nfs4_pnfs_ds *
807 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
811 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
812 struct nfs4_pnfs_ds *ds;
813 bool fail_return = false;
816 /* mirrors are sorted by efficiency */
817 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
818 if (idx+1 == fls->mirror_array_cnt)
820 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
831 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
832 struct nfs_page *req,
836 pnfs_put_lseg(pgio->pg_lseg);
837 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
844 if (IS_ERR(pgio->pg_lseg)) {
845 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
846 pgio->pg_lseg = NULL;
849 /* If we don't have checking, do get a IOMODE_RW
850 * segment, and the server wants to avoid READs
853 if (pgio->pg_lseg && !strict_iomode &&
854 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
855 strict_iomode = true;
861 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
862 struct nfs_page *req)
864 struct nfs_pgio_mirror *pgm;
865 struct nfs4_ff_layout_mirror *mirror;
866 struct nfs4_pnfs_ds *ds;
870 /* Use full layout for now */
872 ff_layout_pg_get_read(pgio, req, false);
873 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
874 ff_layout_pg_get_read(pgio, req, true);
876 /* If no lseg, fall back to read through mds */
877 if (pgio->pg_lseg == NULL)
880 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
882 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
884 pnfs_put_lseg(pgio->pg_lseg);
885 pgio->pg_lseg = NULL;
886 /* Sleep for 1 second before retrying */
891 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
893 pgio->pg_mirror_idx = ds_idx;
895 /* read always uses only one mirror - idx 0 for pgio layer */
896 pgm = &pgio->pg_mirrors[0];
897 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
901 pnfs_put_lseg(pgio->pg_lseg);
902 pgio->pg_lseg = NULL;
903 nfs_pageio_reset_read_mds(pgio);
907 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
908 struct nfs_page *req)
910 struct nfs4_ff_layout_mirror *mirror;
911 struct nfs_pgio_mirror *pgm;
912 struct nfs_commit_info cinfo;
913 struct nfs4_pnfs_ds *ds;
918 if (!pgio->pg_lseg) {
919 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
926 if (IS_ERR(pgio->pg_lseg)) {
927 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
928 pgio->pg_lseg = NULL;
932 /* If no lseg, fall back to write through mds */
933 if (pgio->pg_lseg == NULL)
936 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
937 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
941 /* Use a direct mapping of ds_idx to pgio mirror_idx */
942 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
945 for (i = 0; i < pgio->pg_mirror_count; i++) {
946 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
948 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
950 pnfs_put_lseg(pgio->pg_lseg);
951 pgio->pg_lseg = NULL;
952 /* Sleep for 1 second before retrying */
956 pgm = &pgio->pg_mirrors[i];
957 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
958 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
963 pnfs_generic_pg_cleanup(pgio);
964 pgio->pg_error = -EAGAIN;
967 pnfs_put_lseg(pgio->pg_lseg);
968 pgio->pg_lseg = NULL;
969 nfs_pageio_reset_write_mds(pgio);
970 pgio->pg_error = -EAGAIN;
974 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
975 struct nfs_page *req)
977 if (!pgio->pg_lseg) {
978 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
985 if (IS_ERR(pgio->pg_lseg)) {
986 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
987 pgio->pg_lseg = NULL;
992 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
994 /* no lseg means that pnfs is not in use, so no mirroring here */
995 nfs_pageio_reset_write_mds(pgio);
1000 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1001 .pg_init = ff_layout_pg_init_read,
1002 .pg_test = pnfs_generic_pg_test,
1003 .pg_doio = pnfs_generic_pg_readpages,
1004 .pg_cleanup = pnfs_generic_pg_cleanup,
1007 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1008 .pg_init = ff_layout_pg_init_write,
1009 .pg_test = pnfs_generic_pg_test,
1010 .pg_doio = pnfs_generic_pg_writepages,
1011 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1012 .pg_cleanup = pnfs_generic_pg_cleanup,
1015 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1017 struct rpc_task *task = &hdr->task;
1019 pnfs_layoutcommit_inode(hdr->inode, false);
1022 dprintk("%s Reset task %5u for i/o through pNFS "
1023 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1025 hdr->inode->i_sb->s_id,
1026 (unsigned long long)NFS_FILEID(hdr->inode),
1028 (unsigned long long)hdr->args.offset);
1030 hdr->completion_ops->reschedule_io(hdr);
1034 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1035 dprintk("%s Reset task %5u for i/o through MDS "
1036 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1038 hdr->inode->i_sb->s_id,
1039 (unsigned long long)NFS_FILEID(hdr->inode),
1041 (unsigned long long)hdr->args.offset);
1043 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1047 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1049 struct rpc_task *task = &hdr->task;
1051 pnfs_layoutcommit_inode(hdr->inode, false);
1053 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1054 dprintk("%s Reset task %5u for i/o through MDS "
1055 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1057 hdr->inode->i_sb->s_id,
1058 (unsigned long long)NFS_FILEID(hdr->inode),
1060 (unsigned long long)hdr->args.offset);
1062 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1066 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1067 struct nfs4_state *state,
1068 struct nfs_client *clp,
1069 struct pnfs_layout_segment *lseg,
1072 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1073 struct inode *inode = lo->plh_inode;
1074 struct nfs_server *mds_server = NFS_SERVER(inode);
1076 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1077 struct nfs_client *mds_client = mds_server->nfs_client;
1078 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1080 switch (task->tk_status) {
1081 /* MDS state errors */
1082 case -NFS4ERR_DELEG_REVOKED:
1083 case -NFS4ERR_ADMIN_REVOKED:
1084 case -NFS4ERR_BAD_STATEID:
1087 nfs_remove_bad_delegation(state->inode, NULL);
1088 case -NFS4ERR_OPENMODE:
1091 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1092 goto out_bad_stateid;
1093 goto wait_on_recovery;
1094 case -NFS4ERR_EXPIRED:
1095 if (state != NULL) {
1096 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1097 goto out_bad_stateid;
1099 nfs4_schedule_lease_recovery(mds_client);
1100 goto wait_on_recovery;
1101 /* DS session errors */
1102 case -NFS4ERR_BADSESSION:
1103 case -NFS4ERR_BADSLOT:
1104 case -NFS4ERR_BAD_HIGH_SLOT:
1105 case -NFS4ERR_DEADSESSION:
1106 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1107 case -NFS4ERR_SEQ_FALSE_RETRY:
1108 case -NFS4ERR_SEQ_MISORDERED:
1109 dprintk("%s ERROR %d, Reset session. Exchangeid "
1110 "flags 0x%x\n", __func__, task->tk_status,
1111 clp->cl_exchange_flags);
1112 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1114 case -NFS4ERR_DELAY:
1115 case -NFS4ERR_GRACE:
1116 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1118 case -NFS4ERR_RETRY_UNCACHED_REP:
1120 /* Invalidate Layout errors */
1121 case -NFS4ERR_PNFS_NO_LAYOUT:
1122 case -ESTALE: /* mapped NFS4ERR_STALE */
1123 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1124 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1125 case -NFS4ERR_FHEXPIRED:
1126 case -NFS4ERR_WRONG_TYPE:
1127 dprintk("%s Invalid layout error %d\n", __func__,
1130 * Destroy layout so new i/o will get a new layout.
1131 * Layout will not be destroyed until all current lseg
1132 * references are put. Mark layout as invalid to resend failed
1133 * i/o and all i/o waiting on the slot table to the MDS until
1134 * layout is destroyed and a new valid layout is obtained.
1136 pnfs_destroy_layout(NFS_I(inode));
1137 rpc_wake_up(&tbl->slot_tbl_waitq);
1139 /* RPC connection errors */
1147 dprintk("%s DS connection error %d\n", __func__,
1149 nfs4_mark_deviceid_unavailable(devid);
1150 rpc_wake_up(&tbl->slot_tbl_waitq);
1153 if (ff_layout_avoid_mds_available_ds(lseg))
1154 return -NFS4ERR_RESET_TO_PNFS;
1156 dprintk("%s Retry through MDS. Error %d\n", __func__,
1158 return -NFS4ERR_RESET_TO_MDS;
1161 task->tk_status = 0;
1164 task->tk_status = -EIO;
1167 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1168 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1169 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1173 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1174 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1175 struct pnfs_layout_segment *lseg,
1178 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1180 switch (task->tk_status) {
1181 /* File access problems. Don't mark the device as unavailable */
1190 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1193 dprintk("%s DS connection error %d\n", __func__,
1195 nfs4_mark_deviceid_unavailable(devid);
1197 /* FIXME: Need to prevent infinite looping here. */
1198 return -NFS4ERR_RESET_TO_PNFS;
1200 task->tk_status = 0;
1201 rpc_restart_call_prepare(task);
1202 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1206 static int ff_layout_async_handle_error(struct rpc_task *task,
1207 struct nfs4_state *state,
1208 struct nfs_client *clp,
1209 struct pnfs_layout_segment *lseg,
1212 int vers = clp->cl_nfs_mod->rpc_vers->number;
1214 if (task->tk_status >= 0)
1217 /* Handle the case of an invalid layout segment */
1218 if (!pnfs_is_valid_lseg(lseg))
1219 return -NFS4ERR_RESET_TO_PNFS;
1223 return ff_layout_async_handle_error_v3(task, lseg, idx);
1225 return ff_layout_async_handle_error_v4(task, state, clp,
1228 /* should never happen */
1234 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1235 int idx, u64 offset, u64 length,
1236 u32 status, int opnum, int error)
1238 struct nfs4_ff_layout_mirror *mirror;
1245 case -EPROTONOSUPPORT:
1256 status = NFS4ERR_NXIO;
1259 status = NFS4ERR_ACCESS;
1274 mirror = FF_LAYOUT_COMP(lseg, idx);
1275 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1276 mirror, offset, length, status, opnum,
1278 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1279 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1282 /* NFS_PROTO call done callback routines */
1283 static int ff_layout_read_done_cb(struct rpc_task *task,
1284 struct nfs_pgio_header *hdr)
1288 trace_nfs4_pnfs_read(hdr, task->tk_status);
1289 if (task->tk_status < 0)
1290 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1291 hdr->args.offset, hdr->args.count,
1292 hdr->res.op_status, OP_READ,
1294 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1295 hdr->ds_clp, hdr->lseg,
1296 hdr->pgio_mirror_idx);
1299 case -NFS4ERR_RESET_TO_PNFS:
1300 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1301 hdr->pgio_mirror_idx + 1,
1302 &hdr->pgio_mirror_idx))
1304 ff_layout_read_record_layoutstats_done(task, hdr);
1305 pnfs_read_resend_pnfs(hdr);
1306 return task->tk_status;
1307 case -NFS4ERR_RESET_TO_MDS:
1308 ff_layout_reset_read(hdr);
1309 return task->tk_status;
1316 rpc_restart_call_prepare(task);
1321 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1323 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1327 * We reference the rpc_cred of the first WRITE that triggers the need for
1328 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1329 * rfc5661 is not clear about which credential should be used.
1331 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1332 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1333 * we always send layoutcommit after DS writes.
1336 ff_layout_set_layoutcommit(struct inode *inode,
1337 struct pnfs_layout_segment *lseg,
1340 if (!ff_layout_need_layoutcommit(lseg))
1343 pnfs_set_layoutcommit(inode, lseg, end_offset);
1344 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1345 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1349 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
1351 /* No mirroring for now */
1352 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1354 return ff_layout_test_devid_unavailable(node);
1357 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1358 struct nfs_pgio_header *hdr)
1360 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1362 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1363 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1368 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1369 struct nfs_pgio_header *hdr)
1371 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1373 nfs4_ff_layout_stat_io_end_read(task,
1374 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1379 static int ff_layout_read_prepare_common(struct rpc_task *task,
1380 struct nfs_pgio_header *hdr)
1382 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1383 rpc_exit(task, -EIO);
1386 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1387 rpc_exit(task, -EHOSTDOWN);
1391 ff_layout_read_record_layoutstats_start(task, hdr);
1396 * Call ops for the async read/write cases
1397 * In the case of dense layouts, the offset needs to be reset to its
1400 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1402 struct nfs_pgio_header *hdr = data;
1404 if (ff_layout_read_prepare_common(task, hdr))
1407 rpc_call_start(task);
1410 static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1411 struct nfs4_sequence_args *args,
1412 struct nfs4_sequence_res *res,
1413 struct rpc_task *task)
1415 if (ds_clp->cl_session)
1416 return nfs41_setup_sequence(ds_clp->cl_session,
1420 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1426 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1428 struct nfs_pgio_header *hdr = data;
1430 if (ff_layout_setup_sequence(hdr->ds_clp,
1431 &hdr->args.seq_args,
1436 if (ff_layout_read_prepare_common(task, hdr))
1439 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1440 hdr->args.lock_context, FMODE_READ) == -EIO)
1441 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1444 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1446 struct nfs_pgio_header *hdr = data;
1448 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1450 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1451 task->tk_status == 0) {
1452 nfs4_sequence_done(task, &hdr->res.seq_res);
1456 /* Note this may cause RPC to be resent */
1457 hdr->mds_ops->rpc_call_done(task, hdr);
1460 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1462 struct nfs_pgio_header *hdr = data;
1464 ff_layout_read_record_layoutstats_done(task, hdr);
1465 rpc_count_iostats_metrics(task,
1466 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1469 static void ff_layout_read_release(void *data)
1471 struct nfs_pgio_header *hdr = data;
1473 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1474 pnfs_generic_rw_release(data);
1478 static int ff_layout_write_done_cb(struct rpc_task *task,
1479 struct nfs_pgio_header *hdr)
1481 loff_t end_offs = 0;
1484 trace_nfs4_pnfs_write(hdr, task->tk_status);
1485 if (task->tk_status < 0)
1486 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1487 hdr->args.offset, hdr->args.count,
1488 hdr->res.op_status, OP_WRITE,
1490 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1491 hdr->ds_clp, hdr->lseg,
1492 hdr->pgio_mirror_idx);
1495 case -NFS4ERR_RESET_TO_PNFS:
1496 ff_layout_reset_write(hdr, true);
1497 return task->tk_status;
1498 case -NFS4ERR_RESET_TO_MDS:
1499 ff_layout_reset_write(hdr, false);
1500 return task->tk_status;
1505 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1506 hdr->res.verf->committed == NFS_DATA_SYNC)
1507 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1509 /* Note: if the write is unstable, don't set end_offs until commit */
1510 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1512 /* zero out fattr since we don't care DS attr at all */
1513 hdr->fattr.valid = 0;
1514 if (task->tk_status >= 0)
1515 nfs_writeback_update_inode(hdr);
1520 static int ff_layout_commit_done_cb(struct rpc_task *task,
1521 struct nfs_commit_data *data)
1525 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1526 if (task->tk_status < 0)
1527 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1528 data->args.offset, data->args.count,
1529 data->res.op_status, OP_COMMIT,
1531 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1532 data->lseg, data->ds_commit_index);
1535 case -NFS4ERR_RESET_TO_PNFS:
1536 pnfs_generic_prepare_to_resend_writes(data);
1538 case -NFS4ERR_RESET_TO_MDS:
1539 pnfs_generic_prepare_to_resend_writes(data);
1542 rpc_restart_call_prepare(task);
1546 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1551 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1552 struct nfs_pgio_header *hdr)
1554 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1556 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1557 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1562 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1563 struct nfs_pgio_header *hdr)
1565 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1567 nfs4_ff_layout_stat_io_end_write(task,
1568 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1569 hdr->args.count, hdr->res.count,
1570 hdr->res.verf->committed);
1573 static int ff_layout_write_prepare_common(struct rpc_task *task,
1574 struct nfs_pgio_header *hdr)
1576 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1577 rpc_exit(task, -EIO);
1581 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1582 rpc_exit(task, -EHOSTDOWN);
1586 ff_layout_write_record_layoutstats_start(task, hdr);
1590 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1592 struct nfs_pgio_header *hdr = data;
1594 if (ff_layout_write_prepare_common(task, hdr))
1597 rpc_call_start(task);
1600 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1602 struct nfs_pgio_header *hdr = data;
1604 if (ff_layout_setup_sequence(hdr->ds_clp,
1605 &hdr->args.seq_args,
1610 if (ff_layout_write_prepare_common(task, hdr))
1613 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1614 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1615 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1618 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1620 struct nfs_pgio_header *hdr = data;
1622 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1623 task->tk_status == 0) {
1624 nfs4_sequence_done(task, &hdr->res.seq_res);
1628 /* Note this may cause RPC to be resent */
1629 hdr->mds_ops->rpc_call_done(task, hdr);
1632 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1634 struct nfs_pgio_header *hdr = data;
1636 ff_layout_write_record_layoutstats_done(task, hdr);
1637 rpc_count_iostats_metrics(task,
1638 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1641 static void ff_layout_write_release(void *data)
1643 struct nfs_pgio_header *hdr = data;
1645 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1646 pnfs_generic_rw_release(data);
1649 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1650 struct nfs_commit_data *cdata)
1652 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1654 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1655 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1659 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1660 struct nfs_commit_data *cdata)
1662 struct nfs_page *req;
1665 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1668 if (task->tk_status == 0) {
1669 list_for_each_entry(req, &cdata->pages, wb_list)
1670 count += req->wb_bytes;
1672 nfs4_ff_layout_stat_io_end_write(task,
1673 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1674 count, count, NFS_FILE_SYNC);
1677 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1678 struct nfs_commit_data *cdata)
1680 ff_layout_commit_record_layoutstats_start(task, cdata);
1683 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1685 ff_layout_commit_prepare_common(task, data);
1686 rpc_call_start(task);
1689 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1691 struct nfs_commit_data *wdata = data;
1693 if (ff_layout_setup_sequence(wdata->ds_clp,
1694 &wdata->args.seq_args,
1695 &wdata->res.seq_res,
1698 ff_layout_commit_prepare_common(task, data);
1701 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1703 pnfs_generic_write_commit_done(task, data);
1706 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1708 struct nfs_commit_data *cdata = data;
1710 ff_layout_commit_record_layoutstats_done(task, cdata);
1711 rpc_count_iostats_metrics(task,
1712 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1715 static void ff_layout_commit_release(void *data)
1717 struct nfs_commit_data *cdata = data;
1719 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1720 pnfs_generic_commit_release(data);
1723 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1724 .rpc_call_prepare = ff_layout_read_prepare_v3,
1725 .rpc_call_done = ff_layout_read_call_done,
1726 .rpc_count_stats = ff_layout_read_count_stats,
1727 .rpc_release = ff_layout_read_release,
1730 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1731 .rpc_call_prepare = ff_layout_read_prepare_v4,
1732 .rpc_call_done = ff_layout_read_call_done,
1733 .rpc_count_stats = ff_layout_read_count_stats,
1734 .rpc_release = ff_layout_read_release,
1737 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1738 .rpc_call_prepare = ff_layout_write_prepare_v3,
1739 .rpc_call_done = ff_layout_write_call_done,
1740 .rpc_count_stats = ff_layout_write_count_stats,
1741 .rpc_release = ff_layout_write_release,
1744 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1745 .rpc_call_prepare = ff_layout_write_prepare_v4,
1746 .rpc_call_done = ff_layout_write_call_done,
1747 .rpc_count_stats = ff_layout_write_count_stats,
1748 .rpc_release = ff_layout_write_release,
1751 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1752 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1753 .rpc_call_done = ff_layout_commit_done,
1754 .rpc_count_stats = ff_layout_commit_count_stats,
1755 .rpc_release = ff_layout_commit_release,
1758 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1759 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1760 .rpc_call_done = ff_layout_commit_done,
1761 .rpc_count_stats = ff_layout_commit_count_stats,
1762 .rpc_release = ff_layout_commit_release,
1765 static enum pnfs_try_status
1766 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1768 struct pnfs_layout_segment *lseg = hdr->lseg;
1769 struct nfs4_pnfs_ds *ds;
1770 struct rpc_clnt *ds_clnt;
1771 struct rpc_cred *ds_cred;
1772 loff_t offset = hdr->args.offset;
1773 u32 idx = hdr->pgio_mirror_idx;
1777 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1778 __func__, hdr->inode->i_ino,
1779 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1781 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1785 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1787 if (IS_ERR(ds_clnt))
1790 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1794 vers = nfs4_ff_layout_ds_version(lseg, idx);
1796 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1797 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1799 hdr->pgio_done_cb = ff_layout_read_done_cb;
1800 atomic_inc(&ds->ds_clp->cl_count);
1801 hdr->ds_clp = ds->ds_clp;
1802 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1806 * Note that if we ever decide to split across DSes,
1807 * then we may need to handle dense-like offsets.
1809 hdr->args.offset = offset;
1810 hdr->mds_offset = offset;
1812 /* Perform an asynchronous read to ds */
1813 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1814 vers == 3 ? &ff_layout_read_call_ops_v3 :
1815 &ff_layout_read_call_ops_v4,
1816 0, RPC_TASK_SOFTCONN);
1817 put_rpccred(ds_cred);
1818 return PNFS_ATTEMPTED;
1821 if (ff_layout_avoid_mds_available_ds(lseg))
1822 return PNFS_TRY_AGAIN;
1823 return PNFS_NOT_ATTEMPTED;
1826 /* Perform async writes. */
1827 static enum pnfs_try_status
1828 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1830 struct pnfs_layout_segment *lseg = hdr->lseg;
1831 struct nfs4_pnfs_ds *ds;
1832 struct rpc_clnt *ds_clnt;
1833 struct rpc_cred *ds_cred;
1834 loff_t offset = hdr->args.offset;
1837 int idx = hdr->pgio_mirror_idx;
1839 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1841 return PNFS_NOT_ATTEMPTED;
1843 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1845 if (IS_ERR(ds_clnt))
1846 return PNFS_NOT_ATTEMPTED;
1848 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1850 return PNFS_NOT_ATTEMPTED;
1852 vers = nfs4_ff_layout_ds_version(lseg, idx);
1854 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1855 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1856 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1859 hdr->pgio_done_cb = ff_layout_write_done_cb;
1860 atomic_inc(&ds->ds_clp->cl_count);
1861 hdr->ds_clp = ds->ds_clp;
1862 hdr->ds_commit_idx = idx;
1863 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1868 * Note that if we ever decide to split across DSes,
1869 * then we may need to handle dense-like offsets.
1871 hdr->args.offset = offset;
1873 /* Perform an asynchronous write */
1874 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1875 vers == 3 ? &ff_layout_write_call_ops_v3 :
1876 &ff_layout_write_call_ops_v4,
1877 sync, RPC_TASK_SOFTCONN);
1878 put_rpccred(ds_cred);
1879 return PNFS_ATTEMPTED;
1882 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1887 static struct nfs_fh *
1888 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1890 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1892 /* FIXME: Assume that there is only one NFS version available
1895 return &flseg->mirror_array[i]->fh_versions[0];
1898 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1900 struct pnfs_layout_segment *lseg = data->lseg;
1901 struct nfs4_pnfs_ds *ds;
1902 struct rpc_clnt *ds_clnt;
1903 struct rpc_cred *ds_cred;
1908 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1909 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1913 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1915 if (IS_ERR(ds_clnt))
1918 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1922 vers = nfs4_ff_layout_ds_version(lseg, idx);
1924 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1925 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1927 data->commit_done_cb = ff_layout_commit_done_cb;
1928 data->cred = ds_cred;
1929 atomic_inc(&ds->ds_clp->cl_count);
1930 data->ds_clp = ds->ds_clp;
1931 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1935 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1936 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1937 &ff_layout_commit_call_ops_v4,
1938 how, RPC_TASK_SOFTCONN);
1939 put_rpccred(ds_cred);
1942 pnfs_generic_prepare_to_resend_writes(data);
1943 pnfs_generic_commit_release(data);
1948 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1949 int how, struct nfs_commit_info *cinfo)
1951 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1952 ff_layout_initiate_commit);
1955 static struct pnfs_ds_commit_info *
1956 ff_layout_get_ds_info(struct inode *inode)
1958 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1963 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1967 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1969 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1973 static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1974 struct xdr_stream *xdr,
1975 const struct nfs4_layoutreturn_args *args)
1977 struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
1979 int count = 0, ret = 0;
1981 start = xdr_reserve_space(xdr, 4);
1982 if (unlikely(!start))
1985 /* This assume we always return _ALL_ layouts */
1986 spin_lock(&hdr->plh_inode->i_lock);
1987 ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
1988 spin_unlock(&hdr->plh_inode->i_lock);
1990 *start = cpu_to_be32(count);
1995 /* report nothing for now */
1996 static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1997 struct xdr_stream *xdr,
1998 const struct nfs4_layoutreturn_args *args)
2002 p = xdr_reserve_space(xdr, 4);
2004 *p = cpu_to_be32(0);
2007 static struct nfs4_deviceid_node *
2008 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2009 struct pnfs_device *pdev, gfp_t gfp_flags)
2011 struct nfs4_ff_layout_ds *dsaddr;
2013 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2016 return &dsaddr->id_node;
2020 ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
2021 struct xdr_stream *xdr,
2022 const struct nfs4_layoutreturn_args *args)
2024 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
2027 dprintk("%s: Begin\n", __func__);
2028 start = xdr_reserve_space(xdr, 4);
2031 ff_layout_encode_ioerr(flo, xdr, args);
2032 ff_layout_encode_iostats(flo, xdr, args);
2034 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2035 dprintk("%s: Return\n", __func__);
2039 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2041 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2043 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2047 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2050 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2051 const struct in6_addr *addr = &sin6->sin6_addr;
2054 * RFC 4291, Section 2.2.2
2056 * Shorthanded ANY address
2058 if (ipv6_addr_any(addr))
2059 return snprintf(buf, buflen, "::");
2062 * RFC 4291, Section 2.2.2
2064 * Shorthanded loopback address
2066 if (ipv6_addr_loopback(addr))
2067 return snprintf(buf, buflen, "::1");
2070 * RFC 4291, Section 2.2.3
2072 * Special presentation address format for mapped v4
2075 if (ipv6_addr_v4mapped(addr))
2076 return snprintf(buf, buflen, "::ffff:%pI4",
2077 &addr->s6_addr32[3]);
2080 * RFC 4291, Section 2.2.1
2082 return snprintf(buf, buflen, "%pI6c", addr);
2085 /* Derived from rpc_sockaddr2uaddr */
2087 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2089 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2090 char portbuf[RPCBIND_MAXUADDRPLEN];
2091 char addrbuf[RPCBIND_MAXUADDRLEN];
2093 unsigned short port;
2097 switch (sap->sa_family) {
2099 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2101 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2106 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2108 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2113 /* we only support tcp and tcp6 */
2118 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2119 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2121 p = xdr_reserve_space(xdr, 4 + netid_len);
2122 xdr_encode_opaque(p, netid, netid_len);
2124 p = xdr_reserve_space(xdr, 4 + len);
2125 xdr_encode_opaque(p, addrbuf, len);
2129 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2132 struct timespec64 ts;
2135 p = xdr_reserve_space(xdr, 12);
2136 ts = ktime_to_timespec64(t);
2137 p = xdr_encode_hyper(p, ts.tv_sec);
2138 *p++ = cpu_to_be32(ts.tv_nsec);
2142 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2143 struct nfs4_ff_io_stat *stat)
2147 p = xdr_reserve_space(xdr, 5 * 8);
2148 p = xdr_encode_hyper(p, stat->ops_requested);
2149 p = xdr_encode_hyper(p, stat->bytes_requested);
2150 p = xdr_encode_hyper(p, stat->ops_completed);
2151 p = xdr_encode_hyper(p, stat->bytes_completed);
2152 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2153 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2154 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2158 ff_layout_encode_layoutstats(struct xdr_stream *xdr,
2159 struct nfs42_layoutstat_args *args,
2160 struct nfs42_layoutstat_devinfo *devinfo)
2162 struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private;
2163 struct nfs4_pnfs_ds_addr *da;
2164 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2165 struct nfs_fh *fh = &mirror->fh_versions[0];
2168 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2169 dprintk("%s: DS %s: encoding address %s\n",
2170 __func__, ds->ds_remotestr, da->da_remotestr);
2171 /* layoutupdate length */
2172 start = xdr_reserve_space(xdr, 4);
2174 ff_layout_encode_netaddr(xdr, da);
2176 p = xdr_reserve_space(xdr, 4 + fh->size);
2177 xdr_encode_opaque(p, fh->data, fh->size);
2178 /* ff_io_latency4 read */
2179 spin_lock(&mirror->lock);
2180 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2181 /* ff_io_latency4 write */
2182 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2183 spin_unlock(&mirror->lock);
2185 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2187 p = xdr_reserve_space(xdr, 4);
2188 *p = cpu_to_be32(false);
2190 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2194 ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
2195 struct pnfs_layout_hdr *lo,
2198 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2199 struct nfs4_ff_layout_mirror *mirror;
2200 struct nfs4_deviceid_node *dev;
2201 struct nfs42_layoutstat_devinfo *devinfo;
2204 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2207 if (!mirror->mirror_ds)
2209 /* mirror refcount put in cleanup_layoutstats */
2210 if (!atomic_inc_not_zero(&mirror->ref))
2212 dev = &mirror->mirror_ds->id_node;
2213 devinfo = &args->devinfo[i];
2214 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2215 devinfo->offset = 0;
2216 devinfo->length = NFS4_MAX_UINT64;
2217 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2218 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2219 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2220 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2221 devinfo->layout_type = LAYOUT_FLEX_FILES;
2222 devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
2223 devinfo->layout_private = mirror;
2231 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2233 struct nfs4_flexfile_layout *ff_layout;
2234 struct nfs4_ff_layout_mirror *mirror;
2237 spin_lock(&args->inode->i_lock);
2238 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2239 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2240 if (atomic_read(&mirror->ref) != 0)
2243 spin_unlock(&args->inode->i_lock);
2244 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2245 if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
2246 dprintk("%s: truncating devinfo to limit (%d:%d)\n",
2247 __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
2248 dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2250 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2254 spin_lock(&args->inode->i_lock);
2255 args->num_dev = ff_layout_mirror_prepare_stats(args,
2256 &ff_layout->generic_hdr, dev_count);
2257 spin_unlock(&args->inode->i_lock);
2263 ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data)
2265 struct nfs4_ff_layout_mirror *mirror;
2268 for (i = 0; i < data->args.num_dev; i++) {
2269 mirror = data->args.devinfo[i].layout_private;
2270 data->args.devinfo[i].layout_private = NULL;
2271 ff_layout_put_mirror(mirror);
2275 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2276 .id = LAYOUT_FLEX_FILES,
2277 .name = "LAYOUT_FLEX_FILES",
2278 .owner = THIS_MODULE,
2279 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2280 .free_layout_hdr = ff_layout_free_layout_hdr,
2281 .alloc_lseg = ff_layout_alloc_lseg,
2282 .free_lseg = ff_layout_free_lseg,
2283 .add_lseg = ff_layout_add_lseg,
2284 .pg_read_ops = &ff_layout_pg_read_ops,
2285 .pg_write_ops = &ff_layout_pg_write_ops,
2286 .get_ds_info = ff_layout_get_ds_info,
2287 .free_deviceid_node = ff_layout_free_deviceid_node,
2288 .mark_request_commit = pnfs_layout_mark_request_commit,
2289 .clear_request_commit = pnfs_generic_clear_request_commit,
2290 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2291 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2292 .commit_pagelist = ff_layout_commit_pagelist,
2293 .read_pagelist = ff_layout_read_pagelist,
2294 .write_pagelist = ff_layout_write_pagelist,
2295 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2296 .encode_layoutreturn = ff_layout_encode_layoutreturn,
2297 .sync = pnfs_nfs_generic_sync,
2298 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2299 .cleanup_layoutstats = ff_layout_cleanup_layoutstats,
2302 static int __init nfs4flexfilelayout_init(void)
2304 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2306 if (!ff_zero_group) {
2307 ff_zero_group = groups_alloc(0);
2311 return pnfs_register_layoutdriver(&flexfilelayout_type);
2314 static void __exit nfs4flexfilelayout_exit(void)
2316 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2318 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2319 if (ff_zero_group) {
2320 put_group_info(ff_zero_group);
2321 ff_zero_group = NULL;
2325 MODULE_ALIAS("nfs-layouttype4-4");
2327 MODULE_LICENSE("GPL");
2328 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2330 module_init(nfs4flexfilelayout_init);
2331 module_exit(nfs4flexfilelayout_exit);