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)
28 #define FF_LAYOUTRETURN_MAXERR 20
31 static struct group_info *ff_zero_group;
33 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
34 struct nfs_pgio_header *hdr);
35 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
36 struct nfs42_layoutstat_devinfo *devinfo,
38 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
39 const struct nfs42_layoutstat_devinfo *devinfo,
40 struct nfs4_ff_layout_mirror *mirror);
42 static struct pnfs_layout_hdr *
43 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
45 struct nfs4_flexfile_layout *ffl;
47 ffl = kzalloc(sizeof(*ffl), gfp_flags);
49 INIT_LIST_HEAD(&ffl->error_list);
50 INIT_LIST_HEAD(&ffl->mirrors);
51 ffl->last_report_time = ktime_get();
52 return &ffl->generic_hdr;
58 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
60 struct nfs4_ff_layout_ds_err *err, *n;
62 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
67 kfree(FF_LAYOUT_FROM_HDR(lo));
70 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
74 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
75 if (unlikely(p == NULL))
77 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
78 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
79 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
80 p[0], p[1], p[2], p[3]);
84 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
88 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
91 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
92 nfs4_print_deviceid(devid);
96 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
100 p = xdr_inline_decode(xdr, 4);
103 fh->size = be32_to_cpup(p++);
104 if (fh->size > NFS_MAXFHSIZE) {
105 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
110 p = xdr_inline_decode(xdr, fh->size);
113 memcpy(&fh->data, p, fh->size);
114 dprintk("%s: fh len %d\n", __func__, fh->size);
120 * Currently only stringified uids and gids are accepted.
121 * I.e., kerberos is not supported to the DSes, so no pricipals.
123 * That means that one common function will suffice, but when
124 * principals are added, this should be split to accomodate
125 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
128 decode_name(struct xdr_stream *xdr, u32 *id)
133 /* opaque_length(4)*/
134 p = xdr_inline_decode(xdr, 4);
137 len = be32_to_cpup(p++);
141 dprintk("%s: len %u\n", __func__, len);
144 p = xdr_inline_decode(xdr, len);
148 if (!nfs_map_string_to_numeric((char *)p, len, id))
154 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
155 const struct nfs4_ff_layout_mirror *m2)
159 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
161 for (i = 0; i < m1->fh_versions_cnt; i++) {
162 bool found_fh = false;
163 for (j = 0; j < m2->fh_versions_cnt; j++) {
164 if (nfs_compare_fh(&m1->fh_versions[i],
165 &m2->fh_versions[j]) == 0) {
176 static struct nfs4_ff_layout_mirror *
177 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
178 struct nfs4_ff_layout_mirror *mirror)
180 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
181 struct nfs4_ff_layout_mirror *pos;
182 struct inode *inode = lo->plh_inode;
184 spin_lock(&inode->i_lock);
185 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
186 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
188 if (!ff_mirror_match_fh(mirror, pos))
190 if (atomic_inc_not_zero(&pos->ref)) {
191 spin_unlock(&inode->i_lock);
195 list_add(&mirror->mirrors, &ff_layout->mirrors);
197 spin_unlock(&inode->i_lock);
202 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
205 if (mirror->layout == NULL)
207 inode = mirror->layout->plh_inode;
208 spin_lock(&inode->i_lock);
209 list_del(&mirror->mirrors);
210 spin_unlock(&inode->i_lock);
211 mirror->layout = NULL;
214 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
216 struct nfs4_ff_layout_mirror *mirror;
218 mirror = kzalloc(sizeof(*mirror), gfp_flags);
219 if (mirror != NULL) {
220 spin_lock_init(&mirror->lock);
221 atomic_set(&mirror->ref, 1);
222 INIT_LIST_HEAD(&mirror->mirrors);
227 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
229 struct rpc_cred *cred;
231 ff_layout_remove_mirror(mirror);
232 kfree(mirror->fh_versions);
233 cred = rcu_access_pointer(mirror->ro_cred);
236 cred = rcu_access_pointer(mirror->rw_cred);
239 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
243 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
245 if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
246 ff_layout_free_mirror(mirror);
249 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
253 if (fls->mirror_array) {
254 for (i = 0; i < fls->mirror_array_cnt; i++) {
255 /* normally mirror_ds is freed in
256 * .free_deviceid_node but we still do it here
257 * for .alloc_lseg error path */
258 ff_layout_put_mirror(fls->mirror_array[i]);
260 kfree(fls->mirror_array);
261 fls->mirror_array = NULL;
265 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
269 dprintk("--> %s\n", __func__);
271 /* FIXME: remove this check when layout segment support is added */
272 if (lgr->range.offset != 0 ||
273 lgr->range.length != NFS4_MAX_UINT64) {
274 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
279 dprintk("--> %s returns %d\n", __func__, ret);
283 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
286 ff_layout_free_mirror_array(fls);
292 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
293 const struct pnfs_layout_range *l2)
297 if (l1->iomode != l2->iomode)
298 return l1->iomode != IOMODE_READ;
299 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
300 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
301 if (end1 < l2->offset)
303 if (end2 < l1->offset)
305 return l2->offset <= l1->offset;
309 ff_lseg_merge(struct pnfs_layout_segment *new,
310 struct pnfs_layout_segment *old)
312 u64 new_end, old_end;
314 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
316 if (new->pls_range.iomode != old->pls_range.iomode)
318 old_end = pnfs_calc_offset_end(old->pls_range.offset,
319 old->pls_range.length);
320 if (old_end < new->pls_range.offset)
322 new_end = pnfs_calc_offset_end(new->pls_range.offset,
323 new->pls_range.length);
324 if (new_end < old->pls_range.offset)
327 /* Mergeable: copy info from 'old' to 'new' */
328 if (new_end < old_end)
330 if (new->pls_range.offset < old->pls_range.offset)
331 new->pls_range.offset = old->pls_range.offset;
332 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
334 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
335 set_bit(NFS_LSEG_ROC, &new->pls_flags);
340 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
341 struct pnfs_layout_segment *lseg,
342 struct list_head *free_me)
344 pnfs_generic_layout_insert_lseg(lo, lseg,
345 ff_lseg_range_is_after,
350 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
354 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
355 for (j = i + 1; j < fls->mirror_array_cnt; j++)
356 if (fls->mirror_array[i]->efficiency <
357 fls->mirror_array[j]->efficiency)
358 swap(fls->mirror_array[i],
359 fls->mirror_array[j]);
363 static struct pnfs_layout_segment *
364 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
365 struct nfs4_layoutget_res *lgr,
368 struct pnfs_layout_segment *ret;
369 struct nfs4_ff_layout_segment *fls = NULL;
370 struct xdr_stream stream;
372 struct page *scratch;
374 u32 mirror_array_cnt;
378 dprintk("--> %s\n", __func__);
379 scratch = alloc_page(gfp_flags);
381 return ERR_PTR(-ENOMEM);
383 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
385 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
387 /* stripe unit and mirror_array_cnt */
389 p = xdr_inline_decode(&stream, 8 + 4);
393 p = xdr_decode_hyper(p, &stripe_unit);
394 mirror_array_cnt = be32_to_cpup(p++);
395 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
396 stripe_unit, mirror_array_cnt);
398 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
399 mirror_array_cnt == 0)
403 fls = kzalloc(sizeof(*fls), gfp_flags);
407 fls->mirror_array_cnt = mirror_array_cnt;
408 fls->stripe_unit = stripe_unit;
409 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
410 sizeof(fls->mirror_array[0]), gfp_flags);
411 if (fls->mirror_array == NULL)
414 for (i = 0; i < fls->mirror_array_cnt; i++) {
415 struct nfs4_ff_layout_mirror *mirror;
416 struct auth_cred acred = { .group_info = ff_zero_group };
417 struct rpc_cred __rcu *cred;
418 u32 ds_count, fh_count, id;
422 p = xdr_inline_decode(&stream, 4);
425 ds_count = be32_to_cpup(p);
427 /* FIXME: allow for striping? */
431 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
432 if (fls->mirror_array[i] == NULL) {
437 fls->mirror_array[i]->ds_count = ds_count;
440 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
446 p = xdr_inline_decode(&stream, 4);
449 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
452 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
458 p = xdr_inline_decode(&stream, 4);
461 fh_count = be32_to_cpup(p);
463 fls->mirror_array[i]->fh_versions =
464 kzalloc(fh_count * sizeof(struct nfs_fh),
466 if (fls->mirror_array[i]->fh_versions == NULL) {
471 for (j = 0; j < fh_count; j++) {
472 rc = decode_nfs_fh(&stream,
473 &fls->mirror_array[i]->fh_versions[j]);
478 fls->mirror_array[i]->fh_versions_cnt = fh_count;
481 rc = decode_name(&stream, &id);
485 acred.uid = make_kuid(&init_user_ns, id);
488 rc = decode_name(&stream, &id);
492 acred.gid = make_kgid(&init_user_ns, id);
494 /* find the cred for it */
495 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
501 if (lgr->range.iomode == IOMODE_READ)
502 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
504 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
506 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
507 if (mirror != fls->mirror_array[i]) {
508 /* swap cred ptrs so free_mirror will clean up old */
509 if (lgr->range.iomode == IOMODE_READ) {
510 cred = xchg(&mirror->ro_cred, cred);
511 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
513 cred = xchg(&mirror->rw_cred, cred);
514 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
516 ff_layout_free_mirror(fls->mirror_array[i]);
517 fls->mirror_array[i] = mirror;
520 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
521 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
522 from_kuid(&init_user_ns, acred.uid),
523 from_kgid(&init_user_ns, acred.gid));
526 p = xdr_inline_decode(&stream, 4);
528 goto out_sort_mirrors;
529 fls->flags = be32_to_cpup(p);
531 p = xdr_inline_decode(&stream, 4);
533 goto out_sort_mirrors;
534 for (i=0; i < fls->mirror_array_cnt; i++)
535 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
538 ff_layout_sort_mirrors(fls);
539 rc = ff_layout_check_layout(lgr);
542 ret = &fls->generic_hdr;
543 dprintk("<-- %s (success)\n", __func__);
545 __free_page(scratch);
548 _ff_layout_free_lseg(fls);
550 dprintk("<-- %s (%d)\n", __func__, rc);
554 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
556 struct pnfs_layout_segment *lseg;
558 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
559 if (lseg->pls_range.iomode == IOMODE_RW)
566 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
568 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
570 dprintk("--> %s\n", __func__);
572 if (lseg->pls_range.iomode == IOMODE_RW) {
573 struct nfs4_flexfile_layout *ffl;
576 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
577 inode = ffl->generic_hdr.plh_inode;
578 spin_lock(&inode->i_lock);
579 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
580 ffl->commit_info.nbuckets = 0;
581 kfree(ffl->commit_info.buckets);
582 ffl->commit_info.buckets = NULL;
584 spin_unlock(&inode->i_lock);
586 _ff_layout_free_lseg(fls);
589 /* Return 1 until we have multiple lsegs support */
591 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
597 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
599 /* first IO request? */
600 if (atomic_inc_return(&timer->n_ops) == 1) {
601 timer->start_time = now;
606 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
610 if (atomic_dec_return(&timer->n_ops) < 0)
613 start = timer->start_time;
614 timer->start_time = now;
615 return ktime_sub(now, start);
619 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
620 struct nfs4_ff_layoutstat *layoutstat,
623 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
624 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
626 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
627 if (!mirror->start_time)
628 mirror->start_time = now;
629 if (mirror->report_interval != 0)
630 report_interval = (s64)mirror->report_interval * 1000LL;
631 else if (layoutstats_timer != 0)
632 report_interval = (s64)layoutstats_timer * 1000LL;
633 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
635 ffl->last_report_time = now;
643 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
646 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
648 iostat->ops_requested++;
649 iostat->bytes_requested += requested;
653 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
656 ktime_t time_completed,
657 ktime_t time_started)
659 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
660 ktime_t completion_time = ktime_sub(time_completed, time_started);
663 iostat->ops_completed++;
664 iostat->bytes_completed += completed;
665 iostat->bytes_not_delivered += requested - completed;
667 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
668 iostat->total_busy_time =
669 ktime_add(iostat->total_busy_time, timer);
670 iostat->aggregate_completion_time =
671 ktime_add(iostat->aggregate_completion_time,
676 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
677 struct nfs4_ff_layout_mirror *mirror,
678 __u64 requested, ktime_t now)
682 spin_lock(&mirror->lock);
683 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
684 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
685 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
686 spin_unlock(&mirror->lock);
689 pnfs_report_layoutstat(inode, GFP_KERNEL);
693 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
694 struct nfs4_ff_layout_mirror *mirror,
698 spin_lock(&mirror->lock);
699 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
700 requested, completed,
701 ktime_get(), task->tk_start);
702 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
703 spin_unlock(&mirror->lock);
707 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
708 struct nfs4_ff_layout_mirror *mirror,
709 __u64 requested, ktime_t now)
713 spin_lock(&mirror->lock);
714 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
715 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
716 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
717 spin_unlock(&mirror->lock);
720 pnfs_report_layoutstat(inode, GFP_NOIO);
724 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
725 struct nfs4_ff_layout_mirror *mirror,
728 enum nfs3_stable_how committed)
730 if (committed == NFS_UNSTABLE)
731 requested = completed = 0;
733 spin_lock(&mirror->lock);
734 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
735 requested, completed, ktime_get(), task->tk_start);
736 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
737 spin_unlock(&mirror->lock);
741 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
742 struct nfs_commit_info *cinfo,
745 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
746 struct pnfs_commit_bucket *buckets;
749 if (cinfo->ds->nbuckets != 0) {
750 /* This assumes there is only one RW lseg per file.
751 * To support multiple lseg per file, we need to
752 * change struct pnfs_commit_bucket to allow dynamic
753 * increasing nbuckets.
758 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
760 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
767 spin_lock(&cinfo->inode->i_lock);
768 if (cinfo->ds->nbuckets != 0)
771 cinfo->ds->buckets = buckets;
772 cinfo->ds->nbuckets = size;
773 for (i = 0; i < size; i++) {
774 INIT_LIST_HEAD(&buckets[i].written);
775 INIT_LIST_HEAD(&buckets[i].committing);
776 /* mark direct verifier as unset */
777 buckets[i].direct_verf.committed =
778 NFS_INVALID_STABLE_HOW;
781 spin_unlock(&cinfo->inode->i_lock);
786 static struct nfs4_pnfs_ds *
787 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
791 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
792 struct nfs4_pnfs_ds *ds;
793 bool fail_return = false;
796 /* mirrors are sorted by efficiency */
797 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
798 if (idx+1 == fls->mirror_array_cnt)
800 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
811 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
812 struct nfs_page *req,
816 pnfs_put_lseg(pgio->pg_lseg);
817 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
824 if (IS_ERR(pgio->pg_lseg)) {
825 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
826 pgio->pg_lseg = NULL;
829 /* If we don't have checking, do get a IOMODE_RW
830 * segment, and the server wants to avoid READs
833 if (pgio->pg_lseg && !strict_iomode &&
834 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
835 strict_iomode = true;
841 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
842 struct nfs_page *req)
844 struct nfs_pgio_mirror *pgm;
845 struct nfs4_ff_layout_mirror *mirror;
846 struct nfs4_pnfs_ds *ds;
850 pnfs_generic_pg_check_layout(pgio);
851 /* Use full layout for now */
853 ff_layout_pg_get_read(pgio, req, false);
854 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
855 ff_layout_pg_get_read(pgio, req, true);
857 /* If no lseg, fall back to read through mds */
858 if (pgio->pg_lseg == NULL)
861 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
863 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
865 pnfs_put_lseg(pgio->pg_lseg);
866 pgio->pg_lseg = NULL;
867 /* Sleep for 1 second before retrying */
872 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
874 pgio->pg_mirror_idx = ds_idx;
876 /* read always uses only one mirror - idx 0 for pgio layer */
877 pgm = &pgio->pg_mirrors[0];
878 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
882 pnfs_put_lseg(pgio->pg_lseg);
883 pgio->pg_lseg = NULL;
884 nfs_pageio_reset_read_mds(pgio);
888 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
889 struct nfs_page *req)
891 struct nfs4_ff_layout_mirror *mirror;
892 struct nfs_pgio_mirror *pgm;
893 struct nfs_commit_info cinfo;
894 struct nfs4_pnfs_ds *ds;
899 pnfs_generic_pg_check_layout(pgio);
900 if (!pgio->pg_lseg) {
901 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
908 if (IS_ERR(pgio->pg_lseg)) {
909 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
910 pgio->pg_lseg = NULL;
914 /* If no lseg, fall back to write through mds */
915 if (pgio->pg_lseg == NULL)
918 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
919 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
923 /* Use a direct mapping of ds_idx to pgio mirror_idx */
924 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
927 for (i = 0; i < pgio->pg_mirror_count; i++) {
928 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
930 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
932 pnfs_put_lseg(pgio->pg_lseg);
933 pgio->pg_lseg = NULL;
934 /* Sleep for 1 second before retrying */
938 pgm = &pgio->pg_mirrors[i];
939 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
940 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
945 pnfs_generic_pg_cleanup(pgio);
946 pgio->pg_error = -EAGAIN;
949 pnfs_put_lseg(pgio->pg_lseg);
950 pgio->pg_lseg = NULL;
951 nfs_pageio_reset_write_mds(pgio);
952 pgio->pg_error = -EAGAIN;
956 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
957 struct nfs_page *req)
959 if (!pgio->pg_lseg) {
960 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
967 if (IS_ERR(pgio->pg_lseg)) {
968 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
969 pgio->pg_lseg = NULL;
974 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
976 /* no lseg means that pnfs is not in use, so no mirroring here */
977 nfs_pageio_reset_write_mds(pgio);
982 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
983 .pg_init = ff_layout_pg_init_read,
984 .pg_test = pnfs_generic_pg_test,
985 .pg_doio = pnfs_generic_pg_readpages,
986 .pg_cleanup = pnfs_generic_pg_cleanup,
989 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
990 .pg_init = ff_layout_pg_init_write,
991 .pg_test = pnfs_generic_pg_test,
992 .pg_doio = pnfs_generic_pg_writepages,
993 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
994 .pg_cleanup = pnfs_generic_pg_cleanup,
997 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
999 struct rpc_task *task = &hdr->task;
1001 pnfs_layoutcommit_inode(hdr->inode, false);
1004 dprintk("%s Reset task %5u for i/o through pNFS "
1005 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1007 hdr->inode->i_sb->s_id,
1008 (unsigned long long)NFS_FILEID(hdr->inode),
1010 (unsigned long long)hdr->args.offset);
1012 hdr->completion_ops->reschedule_io(hdr);
1016 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1017 dprintk("%s Reset task %5u for i/o through MDS "
1018 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1020 hdr->inode->i_sb->s_id,
1021 (unsigned long long)NFS_FILEID(hdr->inode),
1023 (unsigned long long)hdr->args.offset);
1025 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1029 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1031 struct rpc_task *task = &hdr->task;
1033 pnfs_layoutcommit_inode(hdr->inode, false);
1035 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1036 dprintk("%s Reset task %5u for i/o through MDS "
1037 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1039 hdr->inode->i_sb->s_id,
1040 (unsigned long long)NFS_FILEID(hdr->inode),
1042 (unsigned long long)hdr->args.offset);
1044 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1048 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1049 struct nfs4_state *state,
1050 struct nfs_client *clp,
1051 struct pnfs_layout_segment *lseg,
1054 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1055 struct inode *inode = lo->plh_inode;
1056 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1057 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1059 switch (task->tk_status) {
1060 case -NFS4ERR_BADSESSION:
1061 case -NFS4ERR_BADSLOT:
1062 case -NFS4ERR_BAD_HIGH_SLOT:
1063 case -NFS4ERR_DEADSESSION:
1064 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1065 case -NFS4ERR_SEQ_FALSE_RETRY:
1066 case -NFS4ERR_SEQ_MISORDERED:
1067 dprintk("%s ERROR %d, Reset session. Exchangeid "
1068 "flags 0x%x\n", __func__, task->tk_status,
1069 clp->cl_exchange_flags);
1070 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1072 case -NFS4ERR_DELAY:
1073 case -NFS4ERR_GRACE:
1074 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1076 case -NFS4ERR_RETRY_UNCACHED_REP:
1078 /* Invalidate Layout errors */
1079 case -NFS4ERR_PNFS_NO_LAYOUT:
1080 case -ESTALE: /* mapped NFS4ERR_STALE */
1081 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1082 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1083 case -NFS4ERR_FHEXPIRED:
1084 case -NFS4ERR_WRONG_TYPE:
1085 dprintk("%s Invalid layout error %d\n", __func__,
1088 * Destroy layout so new i/o will get a new layout.
1089 * Layout will not be destroyed until all current lseg
1090 * references are put. Mark layout as invalid to resend failed
1091 * i/o and all i/o waiting on the slot table to the MDS until
1092 * layout is destroyed and a new valid layout is obtained.
1094 pnfs_destroy_layout(NFS_I(inode));
1095 rpc_wake_up(&tbl->slot_tbl_waitq);
1097 /* RPC connection errors */
1105 dprintk("%s DS connection error %d\n", __func__,
1107 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1109 rpc_wake_up(&tbl->slot_tbl_waitq);
1112 if (ff_layout_avoid_mds_available_ds(lseg))
1113 return -NFS4ERR_RESET_TO_PNFS;
1115 dprintk("%s Retry through MDS. Error %d\n", __func__,
1117 return -NFS4ERR_RESET_TO_MDS;
1119 task->tk_status = 0;
1123 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1124 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1125 struct pnfs_layout_segment *lseg,
1128 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1130 switch (task->tk_status) {
1131 /* File access problems. Don't mark the device as unavailable */
1140 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1143 dprintk("%s DS connection error %d\n", __func__,
1145 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1148 /* FIXME: Need to prevent infinite looping here. */
1149 return -NFS4ERR_RESET_TO_PNFS;
1151 task->tk_status = 0;
1152 rpc_restart_call_prepare(task);
1153 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1157 static int ff_layout_async_handle_error(struct rpc_task *task,
1158 struct nfs4_state *state,
1159 struct nfs_client *clp,
1160 struct pnfs_layout_segment *lseg,
1163 int vers = clp->cl_nfs_mod->rpc_vers->number;
1165 if (task->tk_status >= 0)
1168 /* Handle the case of an invalid layout segment */
1169 if (!pnfs_is_valid_lseg(lseg))
1170 return -NFS4ERR_RESET_TO_PNFS;
1174 return ff_layout_async_handle_error_v3(task, lseg, idx);
1176 return ff_layout_async_handle_error_v4(task, state, clp,
1179 /* should never happen */
1185 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1186 int idx, u64 offset, u64 length,
1187 u32 status, int opnum, int error)
1189 struct nfs4_ff_layout_mirror *mirror;
1196 case -EPROTONOSUPPORT:
1208 status = NFS4ERR_NXIO;
1211 status = NFS4ERR_ACCESS;
1226 mirror = FF_LAYOUT_COMP(lseg, idx);
1227 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1228 mirror, offset, length, status, opnum,
1230 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1231 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1234 /* NFS_PROTO call done callback routines */
1235 static int ff_layout_read_done_cb(struct rpc_task *task,
1236 struct nfs_pgio_header *hdr)
1240 trace_nfs4_pnfs_read(hdr, task->tk_status);
1241 if (task->tk_status < 0)
1242 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1243 hdr->args.offset, hdr->args.count,
1244 hdr->res.op_status, OP_READ,
1246 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1247 hdr->ds_clp, hdr->lseg,
1248 hdr->pgio_mirror_idx);
1251 case -NFS4ERR_RESET_TO_PNFS:
1252 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1253 hdr->pgio_mirror_idx + 1,
1254 &hdr->pgio_mirror_idx))
1256 ff_layout_read_record_layoutstats_done(task, hdr);
1257 pnfs_read_resend_pnfs(hdr);
1258 return task->tk_status;
1259 case -NFS4ERR_RESET_TO_MDS:
1260 ff_layout_reset_read(hdr);
1261 return task->tk_status;
1268 rpc_restart_call_prepare(task);
1273 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1275 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1279 * We reference the rpc_cred of the first WRITE that triggers the need for
1280 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1281 * rfc5661 is not clear about which credential should be used.
1283 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1284 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1285 * we always send layoutcommit after DS writes.
1288 ff_layout_set_layoutcommit(struct inode *inode,
1289 struct pnfs_layout_segment *lseg,
1292 if (!ff_layout_need_layoutcommit(lseg))
1295 pnfs_set_layoutcommit(inode, lseg, end_offset);
1296 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1297 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1301 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
1303 /* No mirroring for now */
1304 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1306 return ff_layout_test_devid_unavailable(node);
1309 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1310 struct nfs_pgio_header *hdr)
1312 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1314 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1315 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1320 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1321 struct nfs_pgio_header *hdr)
1323 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1325 nfs4_ff_layout_stat_io_end_read(task,
1326 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1331 static int ff_layout_read_prepare_common(struct rpc_task *task,
1332 struct nfs_pgio_header *hdr)
1334 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1335 rpc_exit(task, -EIO);
1338 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1339 rpc_exit(task, -EHOSTDOWN);
1343 ff_layout_read_record_layoutstats_start(task, hdr);
1348 * Call ops for the async read/write cases
1349 * In the case of dense layouts, the offset needs to be reset to its
1352 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1354 struct nfs_pgio_header *hdr = data;
1356 if (ff_layout_read_prepare_common(task, hdr))
1359 rpc_call_start(task);
1362 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1364 struct nfs_pgio_header *hdr = data;
1366 if (nfs4_setup_sequence(hdr->ds_clp,
1367 &hdr->args.seq_args,
1372 ff_layout_read_prepare_common(task, hdr);
1375 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1377 struct nfs_pgio_header *hdr = data;
1379 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1381 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1382 task->tk_status == 0) {
1383 nfs4_sequence_done(task, &hdr->res.seq_res);
1387 /* Note this may cause RPC to be resent */
1388 hdr->mds_ops->rpc_call_done(task, hdr);
1391 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1393 struct nfs_pgio_header *hdr = data;
1395 ff_layout_read_record_layoutstats_done(task, hdr);
1396 rpc_count_iostats_metrics(task,
1397 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1400 static void ff_layout_read_release(void *data)
1402 struct nfs_pgio_header *hdr = data;
1404 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1405 pnfs_generic_rw_release(data);
1409 static int ff_layout_write_done_cb(struct rpc_task *task,
1410 struct nfs_pgio_header *hdr)
1412 loff_t end_offs = 0;
1415 trace_nfs4_pnfs_write(hdr, task->tk_status);
1416 if (task->tk_status < 0)
1417 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1418 hdr->args.offset, hdr->args.count,
1419 hdr->res.op_status, OP_WRITE,
1421 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1422 hdr->ds_clp, hdr->lseg,
1423 hdr->pgio_mirror_idx);
1426 case -NFS4ERR_RESET_TO_PNFS:
1427 ff_layout_reset_write(hdr, true);
1428 return task->tk_status;
1429 case -NFS4ERR_RESET_TO_MDS:
1430 ff_layout_reset_write(hdr, false);
1431 return task->tk_status;
1436 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1437 hdr->res.verf->committed == NFS_DATA_SYNC)
1438 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1440 /* Note: if the write is unstable, don't set end_offs until commit */
1441 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1443 /* zero out fattr since we don't care DS attr at all */
1444 hdr->fattr.valid = 0;
1445 if (task->tk_status >= 0)
1446 nfs_writeback_update_inode(hdr);
1451 static int ff_layout_commit_done_cb(struct rpc_task *task,
1452 struct nfs_commit_data *data)
1456 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1457 if (task->tk_status < 0)
1458 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1459 data->args.offset, data->args.count,
1460 data->res.op_status, OP_COMMIT,
1462 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1463 data->lseg, data->ds_commit_index);
1466 case -NFS4ERR_RESET_TO_PNFS:
1467 pnfs_generic_prepare_to_resend_writes(data);
1469 case -NFS4ERR_RESET_TO_MDS:
1470 pnfs_generic_prepare_to_resend_writes(data);
1473 rpc_restart_call_prepare(task);
1477 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1482 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1483 struct nfs_pgio_header *hdr)
1485 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1487 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1488 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1493 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1494 struct nfs_pgio_header *hdr)
1496 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1498 nfs4_ff_layout_stat_io_end_write(task,
1499 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1500 hdr->args.count, hdr->res.count,
1501 hdr->res.verf->committed);
1504 static int ff_layout_write_prepare_common(struct rpc_task *task,
1505 struct nfs_pgio_header *hdr)
1507 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1508 rpc_exit(task, -EIO);
1512 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1513 rpc_exit(task, -EHOSTDOWN);
1517 ff_layout_write_record_layoutstats_start(task, hdr);
1521 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1523 struct nfs_pgio_header *hdr = data;
1525 if (ff_layout_write_prepare_common(task, hdr))
1528 rpc_call_start(task);
1531 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1533 struct nfs_pgio_header *hdr = data;
1535 if (nfs4_setup_sequence(hdr->ds_clp,
1536 &hdr->args.seq_args,
1541 ff_layout_write_prepare_common(task, hdr);
1544 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1546 struct nfs_pgio_header *hdr = data;
1548 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1549 task->tk_status == 0) {
1550 nfs4_sequence_done(task, &hdr->res.seq_res);
1554 /* Note this may cause RPC to be resent */
1555 hdr->mds_ops->rpc_call_done(task, hdr);
1558 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1560 struct nfs_pgio_header *hdr = data;
1562 ff_layout_write_record_layoutstats_done(task, hdr);
1563 rpc_count_iostats_metrics(task,
1564 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1567 static void ff_layout_write_release(void *data)
1569 struct nfs_pgio_header *hdr = data;
1571 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1572 pnfs_generic_rw_release(data);
1575 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1576 struct nfs_commit_data *cdata)
1578 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1580 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1581 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1585 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1586 struct nfs_commit_data *cdata)
1588 struct nfs_page *req;
1591 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1594 if (task->tk_status == 0) {
1595 list_for_each_entry(req, &cdata->pages, wb_list)
1596 count += req->wb_bytes;
1598 nfs4_ff_layout_stat_io_end_write(task,
1599 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1600 count, count, NFS_FILE_SYNC);
1603 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1604 struct nfs_commit_data *cdata)
1606 ff_layout_commit_record_layoutstats_start(task, cdata);
1609 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1611 ff_layout_commit_prepare_common(task, data);
1612 rpc_call_start(task);
1615 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1617 struct nfs_commit_data *wdata = data;
1619 if (nfs4_setup_sequence(wdata->ds_clp,
1620 &wdata->args.seq_args,
1621 &wdata->res.seq_res,
1624 ff_layout_commit_prepare_common(task, data);
1627 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1629 pnfs_generic_write_commit_done(task, data);
1632 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1634 struct nfs_commit_data *cdata = data;
1636 ff_layout_commit_record_layoutstats_done(task, cdata);
1637 rpc_count_iostats_metrics(task,
1638 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1641 static void ff_layout_commit_release(void *data)
1643 struct nfs_commit_data *cdata = data;
1645 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1646 pnfs_generic_commit_release(data);
1649 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1650 .rpc_call_prepare = ff_layout_read_prepare_v3,
1651 .rpc_call_done = ff_layout_read_call_done,
1652 .rpc_count_stats = ff_layout_read_count_stats,
1653 .rpc_release = ff_layout_read_release,
1656 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1657 .rpc_call_prepare = ff_layout_read_prepare_v4,
1658 .rpc_call_done = ff_layout_read_call_done,
1659 .rpc_count_stats = ff_layout_read_count_stats,
1660 .rpc_release = ff_layout_read_release,
1663 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1664 .rpc_call_prepare = ff_layout_write_prepare_v3,
1665 .rpc_call_done = ff_layout_write_call_done,
1666 .rpc_count_stats = ff_layout_write_count_stats,
1667 .rpc_release = ff_layout_write_release,
1670 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1671 .rpc_call_prepare = ff_layout_write_prepare_v4,
1672 .rpc_call_done = ff_layout_write_call_done,
1673 .rpc_count_stats = ff_layout_write_count_stats,
1674 .rpc_release = ff_layout_write_release,
1677 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1678 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1679 .rpc_call_done = ff_layout_commit_done,
1680 .rpc_count_stats = ff_layout_commit_count_stats,
1681 .rpc_release = ff_layout_commit_release,
1684 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1685 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1686 .rpc_call_done = ff_layout_commit_done,
1687 .rpc_count_stats = ff_layout_commit_count_stats,
1688 .rpc_release = ff_layout_commit_release,
1691 static enum pnfs_try_status
1692 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1694 struct pnfs_layout_segment *lseg = hdr->lseg;
1695 struct nfs4_pnfs_ds *ds;
1696 struct rpc_clnt *ds_clnt;
1697 struct rpc_cred *ds_cred;
1698 loff_t offset = hdr->args.offset;
1699 u32 idx = hdr->pgio_mirror_idx;
1703 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1704 __func__, hdr->inode->i_ino,
1705 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1707 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1711 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1713 if (IS_ERR(ds_clnt))
1716 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1720 vers = nfs4_ff_layout_ds_version(lseg, idx);
1722 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1723 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1725 hdr->pgio_done_cb = ff_layout_read_done_cb;
1726 atomic_inc(&ds->ds_clp->cl_count);
1727 hdr->ds_clp = ds->ds_clp;
1728 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1733 !nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
1737 * Note that if we ever decide to split across DSes,
1738 * then we may need to handle dense-like offsets.
1740 hdr->args.offset = offset;
1741 hdr->mds_offset = offset;
1743 /* Perform an asynchronous read to ds */
1744 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1745 vers == 3 ? &ff_layout_read_call_ops_v3 :
1746 &ff_layout_read_call_ops_v4,
1747 0, RPC_TASK_SOFTCONN);
1748 put_rpccred(ds_cred);
1749 return PNFS_ATTEMPTED;
1752 if (ff_layout_avoid_mds_available_ds(lseg))
1753 return PNFS_TRY_AGAIN;
1754 return PNFS_NOT_ATTEMPTED;
1757 /* Perform async writes. */
1758 static enum pnfs_try_status
1759 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1761 struct pnfs_layout_segment *lseg = hdr->lseg;
1762 struct nfs4_pnfs_ds *ds;
1763 struct rpc_clnt *ds_clnt;
1764 struct rpc_cred *ds_cred;
1765 loff_t offset = hdr->args.offset;
1768 int idx = hdr->pgio_mirror_idx;
1770 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1774 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1776 if (IS_ERR(ds_clnt))
1779 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1783 vers = nfs4_ff_layout_ds_version(lseg, idx);
1785 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1786 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1787 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1790 hdr->pgio_done_cb = ff_layout_write_done_cb;
1791 atomic_inc(&ds->ds_clp->cl_count);
1792 hdr->ds_clp = ds->ds_clp;
1793 hdr->ds_commit_idx = idx;
1794 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1799 !nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
1803 * Note that if we ever decide to split across DSes,
1804 * then we may need to handle dense-like offsets.
1806 hdr->args.offset = offset;
1808 /* Perform an asynchronous write */
1809 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1810 vers == 3 ? &ff_layout_write_call_ops_v3 :
1811 &ff_layout_write_call_ops_v4,
1812 sync, RPC_TASK_SOFTCONN);
1813 put_rpccred(ds_cred);
1814 return PNFS_ATTEMPTED;
1817 if (ff_layout_avoid_mds_available_ds(lseg))
1818 return PNFS_TRY_AGAIN;
1819 return PNFS_NOT_ATTEMPTED;
1822 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1827 static struct nfs_fh *
1828 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1830 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1832 /* FIXME: Assume that there is only one NFS version available
1835 return &flseg->mirror_array[i]->fh_versions[0];
1838 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1840 struct pnfs_layout_segment *lseg = data->lseg;
1841 struct nfs4_pnfs_ds *ds;
1842 struct rpc_clnt *ds_clnt;
1843 struct rpc_cred *ds_cred;
1848 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1849 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1852 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1853 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1857 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1859 if (IS_ERR(ds_clnt))
1862 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1866 vers = nfs4_ff_layout_ds_version(lseg, idx);
1868 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1869 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1871 data->commit_done_cb = ff_layout_commit_done_cb;
1872 data->cred = ds_cred;
1873 atomic_inc(&ds->ds_clp->cl_count);
1874 data->ds_clp = ds->ds_clp;
1875 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1879 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1880 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1881 &ff_layout_commit_call_ops_v4,
1882 how, RPC_TASK_SOFTCONN);
1883 put_rpccred(ds_cred);
1886 pnfs_generic_prepare_to_resend_writes(data);
1887 pnfs_generic_commit_release(data);
1892 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1893 int how, struct nfs_commit_info *cinfo)
1895 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1896 ff_layout_initiate_commit);
1899 static struct pnfs_ds_commit_info *
1900 ff_layout_get_ds_info(struct inode *inode)
1902 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1907 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1911 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1913 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1917 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1918 const struct nfs4_layoutreturn_args *args,
1919 const struct nfs4_flexfile_layoutreturn_args *ff_args)
1923 start = xdr_reserve_space(xdr, 4);
1924 if (unlikely(!start))
1927 *start = cpu_to_be32(ff_args->num_errors);
1928 /* This assume we always return _ALL_ layouts */
1929 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
1933 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1935 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
1939 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1940 const nfs4_stateid *stateid,
1941 const struct nfs42_layoutstat_devinfo *devinfo)
1945 p = xdr_reserve_space(xdr, 8 + 8);
1946 p = xdr_encode_hyper(p, devinfo->offset);
1947 p = xdr_encode_hyper(p, devinfo->length);
1948 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1949 p = xdr_reserve_space(xdr, 4*8);
1950 p = xdr_encode_hyper(p, devinfo->read_count);
1951 p = xdr_encode_hyper(p, devinfo->read_bytes);
1952 p = xdr_encode_hyper(p, devinfo->write_count);
1953 p = xdr_encode_hyper(p, devinfo->write_bytes);
1954 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1958 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1959 const nfs4_stateid *stateid,
1960 const struct nfs42_layoutstat_devinfo *devinfo)
1962 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1963 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1964 devinfo->ld_private.data);
1967 /* report nothing for now */
1968 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
1969 const struct nfs4_layoutreturn_args *args,
1970 struct nfs4_flexfile_layoutreturn_args *ff_args)
1975 p = xdr_reserve_space(xdr, 4);
1976 *p = cpu_to_be32(ff_args->num_dev);
1977 for (i = 0; i < ff_args->num_dev; i++)
1978 ff_layout_encode_ff_iostat(xdr,
1979 &args->layout->plh_stateid,
1980 &ff_args->devinfo[i]);
1984 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
1985 unsigned int num_entries)
1989 for (i = 0; i < num_entries; i++) {
1990 if (!devinfo[i].ld_private.ops)
1992 if (!devinfo[i].ld_private.ops->free)
1994 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
1998 static struct nfs4_deviceid_node *
1999 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2000 struct pnfs_device *pdev, gfp_t gfp_flags)
2002 struct nfs4_ff_layout_ds *dsaddr;
2004 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2007 return &dsaddr->id_node;
2011 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2012 const void *voidargs,
2013 const struct nfs4_xdr_opaque_data *ff_opaque)
2015 const struct nfs4_layoutreturn_args *args = voidargs;
2016 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2017 struct xdr_buf tmp_buf = {
2020 .iov_base = page_address(ff_args->pages[0]),
2023 .buflen = PAGE_SIZE,
2025 struct xdr_stream tmp_xdr;
2028 dprintk("%s: Begin\n", __func__);
2030 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2032 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2033 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2035 start = xdr_reserve_space(xdr, 4);
2036 *start = cpu_to_be32(tmp_buf.len);
2037 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2039 dprintk("%s: Return\n", __func__);
2043 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2045 struct nfs4_flexfile_layoutreturn_args *ff_args;
2049 ff_args = args->data;
2052 ff_layout_free_ds_ioerr(&ff_args->errors);
2053 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2055 put_page(ff_args->pages[0]);
2059 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2060 .encode = ff_layout_encode_layoutreturn,
2061 .free = ff_layout_free_layoutreturn,
2065 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2067 struct nfs4_flexfile_layoutreturn_args *ff_args;
2068 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2070 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2073 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2074 if (!ff_args->pages[0])
2075 goto out_nomem_free;
2077 INIT_LIST_HEAD(&ff_args->errors);
2078 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2079 &args->range, &ff_args->errors,
2080 FF_LAYOUTRETURN_MAXERR);
2082 spin_lock(&args->inode->i_lock);
2083 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2084 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2085 spin_unlock(&args->inode->i_lock);
2087 args->ld_private->ops = &layoutreturn_ops;
2088 args->ld_private->data = ff_args;
2097 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2099 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2101 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2105 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2108 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2109 const struct in6_addr *addr = &sin6->sin6_addr;
2112 * RFC 4291, Section 2.2.2
2114 * Shorthanded ANY address
2116 if (ipv6_addr_any(addr))
2117 return snprintf(buf, buflen, "::");
2120 * RFC 4291, Section 2.2.2
2122 * Shorthanded loopback address
2124 if (ipv6_addr_loopback(addr))
2125 return snprintf(buf, buflen, "::1");
2128 * RFC 4291, Section 2.2.3
2130 * Special presentation address format for mapped v4
2133 if (ipv6_addr_v4mapped(addr))
2134 return snprintf(buf, buflen, "::ffff:%pI4",
2135 &addr->s6_addr32[3]);
2138 * RFC 4291, Section 2.2.1
2140 return snprintf(buf, buflen, "%pI6c", addr);
2143 /* Derived from rpc_sockaddr2uaddr */
2145 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2147 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2148 char portbuf[RPCBIND_MAXUADDRPLEN];
2149 char addrbuf[RPCBIND_MAXUADDRLEN];
2151 unsigned short port;
2155 switch (sap->sa_family) {
2157 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2159 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2164 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2166 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2171 /* we only support tcp and tcp6 */
2176 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2177 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2179 p = xdr_reserve_space(xdr, 4 + netid_len);
2180 xdr_encode_opaque(p, netid, netid_len);
2182 p = xdr_reserve_space(xdr, 4 + len);
2183 xdr_encode_opaque(p, addrbuf, len);
2187 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2190 struct timespec64 ts;
2193 p = xdr_reserve_space(xdr, 12);
2194 ts = ktime_to_timespec64(t);
2195 p = xdr_encode_hyper(p, ts.tv_sec);
2196 *p++ = cpu_to_be32(ts.tv_nsec);
2200 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2201 struct nfs4_ff_io_stat *stat)
2205 p = xdr_reserve_space(xdr, 5 * 8);
2206 p = xdr_encode_hyper(p, stat->ops_requested);
2207 p = xdr_encode_hyper(p, stat->bytes_requested);
2208 p = xdr_encode_hyper(p, stat->ops_completed);
2209 p = xdr_encode_hyper(p, stat->bytes_completed);
2210 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2211 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2212 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2216 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2217 const struct nfs42_layoutstat_devinfo *devinfo,
2218 struct nfs4_ff_layout_mirror *mirror)
2220 struct nfs4_pnfs_ds_addr *da;
2221 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2222 struct nfs_fh *fh = &mirror->fh_versions[0];
2225 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2226 dprintk("%s: DS %s: encoding address %s\n",
2227 __func__, ds->ds_remotestr, da->da_remotestr);
2229 ff_layout_encode_netaddr(xdr, da);
2231 p = xdr_reserve_space(xdr, 4 + fh->size);
2232 xdr_encode_opaque(p, fh->data, fh->size);
2233 /* ff_io_latency4 read */
2234 spin_lock(&mirror->lock);
2235 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2236 /* ff_io_latency4 write */
2237 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2238 spin_unlock(&mirror->lock);
2240 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2242 p = xdr_reserve_space(xdr, 4);
2243 *p = cpu_to_be32(false);
2247 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2248 const struct nfs4_xdr_opaque_data *opaque)
2250 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2251 struct nfs42_layoutstat_devinfo, ld_private);
2254 /* layoutupdate length */
2255 start = xdr_reserve_space(xdr, 4);
2256 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2258 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2262 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2264 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2266 ff_layout_put_mirror(mirror);
2269 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2270 .encode = ff_layout_encode_layoutstats,
2271 .free = ff_layout_free_layoutstats,
2275 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2276 struct nfs42_layoutstat_devinfo *devinfo,
2279 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2280 struct nfs4_ff_layout_mirror *mirror;
2281 struct nfs4_deviceid_node *dev;
2284 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2287 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2289 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2291 /* mirror refcount put in cleanup_layoutstats */
2292 if (!atomic_inc_not_zero(&mirror->ref))
2294 dev = &mirror->mirror_ds->id_node;
2295 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2296 devinfo->offset = 0;
2297 devinfo->length = NFS4_MAX_UINT64;
2298 spin_lock(&mirror->lock);
2299 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2300 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2301 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2302 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2303 spin_unlock(&mirror->lock);
2304 devinfo->layout_type = LAYOUT_FLEX_FILES;
2305 devinfo->ld_private.ops = &layoutstat_ops;
2306 devinfo->ld_private.data = mirror;
2315 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2317 struct nfs4_flexfile_layout *ff_layout;
2318 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2320 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2321 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2325 spin_lock(&args->inode->i_lock);
2326 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2327 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2328 &args->devinfo[0], dev_count);
2329 spin_unlock(&args->inode->i_lock);
2330 if (!args->num_dev) {
2331 kfree(args->devinfo);
2332 args->devinfo = NULL;
2340 ff_layout_set_layoutdriver(struct nfs_server *server,
2341 const struct nfs_fh *dummy)
2343 #if IS_ENABLED(CONFIG_NFS_V4_2)
2344 server->caps |= NFS_CAP_LAYOUTSTATS;
2349 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2350 .id = LAYOUT_FLEX_FILES,
2351 .name = "LAYOUT_FLEX_FILES",
2352 .owner = THIS_MODULE,
2353 .set_layoutdriver = ff_layout_set_layoutdriver,
2354 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2355 .free_layout_hdr = ff_layout_free_layout_hdr,
2356 .alloc_lseg = ff_layout_alloc_lseg,
2357 .free_lseg = ff_layout_free_lseg,
2358 .add_lseg = ff_layout_add_lseg,
2359 .pg_read_ops = &ff_layout_pg_read_ops,
2360 .pg_write_ops = &ff_layout_pg_write_ops,
2361 .get_ds_info = ff_layout_get_ds_info,
2362 .free_deviceid_node = ff_layout_free_deviceid_node,
2363 .mark_request_commit = pnfs_layout_mark_request_commit,
2364 .clear_request_commit = pnfs_generic_clear_request_commit,
2365 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2366 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2367 .commit_pagelist = ff_layout_commit_pagelist,
2368 .read_pagelist = ff_layout_read_pagelist,
2369 .write_pagelist = ff_layout_write_pagelist,
2370 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2371 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2372 .sync = pnfs_nfs_generic_sync,
2373 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2376 static int __init nfs4flexfilelayout_init(void)
2378 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2380 if (!ff_zero_group) {
2381 ff_zero_group = groups_alloc(0);
2385 return pnfs_register_layoutdriver(&flexfilelayout_type);
2388 static void __exit nfs4flexfilelayout_exit(void)
2390 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2392 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2393 if (ff_zero_group) {
2394 put_group_info(ff_zero_group);
2395 ff_zero_group = NULL;
2399 MODULE_ALIAS("nfs-layouttype4-4");
2401 MODULE_LICENSE("GPL");
2402 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2404 module_init(nfs4flexfilelayout_init);
2405 module_exit(nfs4flexfilelayout_exit);