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 > sizeof(struct nfs_fh)) {
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 (refcount_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 refcount_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 && refcount_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 kcalloc(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 (WARN_ON_ONCE(pgio->pg_mirror_count !=
925 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
928 for (i = 0; i < pgio->pg_mirror_count; i++) {
929 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
931 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
933 pnfs_put_lseg(pgio->pg_lseg);
934 pgio->pg_lseg = NULL;
935 /* Sleep for 1 second before retrying */
939 pgm = &pgio->pg_mirrors[i];
940 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
941 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
947 pnfs_put_lseg(pgio->pg_lseg);
948 pgio->pg_lseg = NULL;
949 nfs_pageio_reset_write_mds(pgio);
953 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
954 struct nfs_page *req)
956 if (!pgio->pg_lseg) {
957 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
964 if (IS_ERR(pgio->pg_lseg)) {
965 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
966 pgio->pg_lseg = NULL;
971 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
973 /* no lseg means that pnfs is not in use, so no mirroring here */
974 nfs_pageio_reset_write_mds(pgio);
979 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
980 .pg_init = ff_layout_pg_init_read,
981 .pg_test = pnfs_generic_pg_test,
982 .pg_doio = pnfs_generic_pg_readpages,
983 .pg_cleanup = pnfs_generic_pg_cleanup,
986 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
987 .pg_init = ff_layout_pg_init_write,
988 .pg_test = pnfs_generic_pg_test,
989 .pg_doio = pnfs_generic_pg_writepages,
990 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
991 .pg_cleanup = pnfs_generic_pg_cleanup,
994 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
996 struct rpc_task *task = &hdr->task;
998 pnfs_layoutcommit_inode(hdr->inode, false);
1001 dprintk("%s Reset task %5u for i/o through pNFS "
1002 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1004 hdr->inode->i_sb->s_id,
1005 (unsigned long long)NFS_FILEID(hdr->inode),
1007 (unsigned long long)hdr->args.offset);
1009 hdr->completion_ops->reschedule_io(hdr);
1013 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1014 dprintk("%s Reset task %5u for i/o through MDS "
1015 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1017 hdr->inode->i_sb->s_id,
1018 (unsigned long long)NFS_FILEID(hdr->inode),
1020 (unsigned long long)hdr->args.offset);
1022 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1026 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1028 struct rpc_task *task = &hdr->task;
1030 pnfs_layoutcommit_inode(hdr->inode, false);
1032 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1033 dprintk("%s Reset task %5u for i/o through MDS "
1034 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1036 hdr->inode->i_sb->s_id,
1037 (unsigned long long)NFS_FILEID(hdr->inode),
1039 (unsigned long long)hdr->args.offset);
1041 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1045 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1046 struct nfs4_state *state,
1047 struct nfs_client *clp,
1048 struct pnfs_layout_segment *lseg,
1051 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1052 struct inode *inode = lo->plh_inode;
1053 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1054 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1056 switch (task->tk_status) {
1057 case -NFS4ERR_BADSESSION:
1058 case -NFS4ERR_BADSLOT:
1059 case -NFS4ERR_BAD_HIGH_SLOT:
1060 case -NFS4ERR_DEADSESSION:
1061 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1062 case -NFS4ERR_SEQ_FALSE_RETRY:
1063 case -NFS4ERR_SEQ_MISORDERED:
1064 dprintk("%s ERROR %d, Reset session. Exchangeid "
1065 "flags 0x%x\n", __func__, task->tk_status,
1066 clp->cl_exchange_flags);
1067 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1069 case -NFS4ERR_DELAY:
1070 case -NFS4ERR_GRACE:
1071 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1073 case -NFS4ERR_RETRY_UNCACHED_REP:
1075 /* Invalidate Layout errors */
1076 case -NFS4ERR_PNFS_NO_LAYOUT:
1077 case -ESTALE: /* mapped NFS4ERR_STALE */
1078 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1079 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1080 case -NFS4ERR_FHEXPIRED:
1081 case -NFS4ERR_WRONG_TYPE:
1082 dprintk("%s Invalid layout error %d\n", __func__,
1085 * Destroy layout so new i/o will get a new layout.
1086 * Layout will not be destroyed until all current lseg
1087 * references are put. Mark layout as invalid to resend failed
1088 * i/o and all i/o waiting on the slot table to the MDS until
1089 * layout is destroyed and a new valid layout is obtained.
1091 pnfs_destroy_layout(NFS_I(inode));
1092 rpc_wake_up(&tbl->slot_tbl_waitq);
1094 /* RPC connection errors */
1102 dprintk("%s DS connection error %d\n", __func__,
1104 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1106 rpc_wake_up(&tbl->slot_tbl_waitq);
1109 if (ff_layout_avoid_mds_available_ds(lseg))
1110 return -NFS4ERR_RESET_TO_PNFS;
1112 dprintk("%s Retry through MDS. Error %d\n", __func__,
1114 return -NFS4ERR_RESET_TO_MDS;
1116 task->tk_status = 0;
1120 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1121 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1122 struct pnfs_layout_segment *lseg,
1125 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1127 switch (task->tk_status) {
1128 /* File access problems. Don't mark the device as unavailable */
1137 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1140 dprintk("%s DS connection error %d\n", __func__,
1142 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1145 /* FIXME: Need to prevent infinite looping here. */
1146 return -NFS4ERR_RESET_TO_PNFS;
1148 task->tk_status = 0;
1149 rpc_restart_call_prepare(task);
1150 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1154 static int ff_layout_async_handle_error(struct rpc_task *task,
1155 struct nfs4_state *state,
1156 struct nfs_client *clp,
1157 struct pnfs_layout_segment *lseg,
1160 int vers = clp->cl_nfs_mod->rpc_vers->number;
1162 if (task->tk_status >= 0)
1165 /* Handle the case of an invalid layout segment */
1166 if (!pnfs_is_valid_lseg(lseg))
1167 return -NFS4ERR_RESET_TO_PNFS;
1171 return ff_layout_async_handle_error_v3(task, lseg, idx);
1173 return ff_layout_async_handle_error_v4(task, state, clp,
1176 /* should never happen */
1182 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1183 int idx, u64 offset, u64 length,
1184 u32 status, int opnum, int error)
1186 struct nfs4_ff_layout_mirror *mirror;
1193 case -EPROTONOSUPPORT:
1204 status = NFS4ERR_NXIO;
1207 status = NFS4ERR_ACCESS;
1222 mirror = FF_LAYOUT_COMP(lseg, idx);
1223 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1224 mirror, offset, length, status, opnum,
1226 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1227 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1230 /* NFS_PROTO call done callback routines */
1231 static int ff_layout_read_done_cb(struct rpc_task *task,
1232 struct nfs_pgio_header *hdr)
1236 trace_nfs4_pnfs_read(hdr, task->tk_status);
1237 if (task->tk_status < 0)
1238 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1239 hdr->args.offset, hdr->args.count,
1240 hdr->res.op_status, OP_READ,
1242 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1243 hdr->ds_clp, hdr->lseg,
1244 hdr->pgio_mirror_idx);
1246 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1247 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1249 case -NFS4ERR_RESET_TO_PNFS:
1250 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1251 hdr->pgio_mirror_idx + 1,
1252 &hdr->pgio_mirror_idx))
1254 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1255 return task->tk_status;
1256 case -NFS4ERR_RESET_TO_MDS:
1257 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1258 return task->tk_status;
1265 rpc_restart_call_prepare(task);
1270 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1272 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1276 * We reference the rpc_cred of the first WRITE that triggers the need for
1277 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1278 * rfc5661 is not clear about which credential should be used.
1280 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1281 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1282 * we always send layoutcommit after DS writes.
1285 ff_layout_set_layoutcommit(struct inode *inode,
1286 struct pnfs_layout_segment *lseg,
1289 if (!ff_layout_need_layoutcommit(lseg))
1292 pnfs_set_layoutcommit(inode, lseg, end_offset);
1293 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1294 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1298 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
1300 /* No mirroring for now */
1301 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1303 return ff_layout_test_devid_unavailable(node);
1306 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1307 struct nfs_pgio_header *hdr)
1309 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1311 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1312 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1317 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1318 struct nfs_pgio_header *hdr)
1320 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1322 nfs4_ff_layout_stat_io_end_read(task,
1323 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1328 static int ff_layout_read_prepare_common(struct rpc_task *task,
1329 struct nfs_pgio_header *hdr)
1331 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1332 rpc_exit(task, -EIO);
1335 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1336 rpc_exit(task, -EHOSTDOWN);
1340 ff_layout_read_record_layoutstats_start(task, hdr);
1345 * Call ops for the async read/write cases
1346 * In the case of dense layouts, the offset needs to be reset to its
1349 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1351 struct nfs_pgio_header *hdr = data;
1353 if (ff_layout_read_prepare_common(task, hdr))
1356 rpc_call_start(task);
1359 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1361 struct nfs_pgio_header *hdr = data;
1363 if (nfs4_setup_sequence(hdr->ds_clp,
1364 &hdr->args.seq_args,
1369 if (ff_layout_read_prepare_common(task, hdr))
1372 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1373 hdr->args.lock_context, FMODE_READ) == -EIO)
1374 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1377 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1379 struct nfs_pgio_header *hdr = data;
1381 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1383 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1384 task->tk_status == 0) {
1385 nfs4_sequence_done(task, &hdr->res.seq_res);
1389 /* Note this may cause RPC to be resent */
1390 hdr->mds_ops->rpc_call_done(task, hdr);
1393 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1395 struct nfs_pgio_header *hdr = data;
1397 ff_layout_read_record_layoutstats_done(task, hdr);
1398 rpc_count_iostats_metrics(task,
1399 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1402 static void ff_layout_read_release(void *data)
1404 struct nfs_pgio_header *hdr = data;
1406 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1407 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1408 pnfs_read_resend_pnfs(hdr);
1409 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1410 ff_layout_reset_read(hdr);
1411 pnfs_generic_rw_release(data);
1415 static int ff_layout_write_done_cb(struct rpc_task *task,
1416 struct nfs_pgio_header *hdr)
1418 loff_t end_offs = 0;
1421 trace_nfs4_pnfs_write(hdr, task->tk_status);
1422 if (task->tk_status < 0)
1423 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1424 hdr->args.offset, hdr->args.count,
1425 hdr->res.op_status, OP_WRITE,
1427 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1428 hdr->ds_clp, hdr->lseg,
1429 hdr->pgio_mirror_idx);
1431 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1432 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1434 case -NFS4ERR_RESET_TO_PNFS:
1435 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1436 return task->tk_status;
1437 case -NFS4ERR_RESET_TO_MDS:
1438 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1439 return task->tk_status;
1444 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1445 hdr->res.verf->committed == NFS_DATA_SYNC)
1446 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1448 /* Note: if the write is unstable, don't set end_offs until commit */
1449 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1451 /* zero out fattr since we don't care DS attr at all */
1452 hdr->fattr.valid = 0;
1453 if (task->tk_status >= 0)
1454 nfs_writeback_update_inode(hdr);
1459 static int ff_layout_commit_done_cb(struct rpc_task *task,
1460 struct nfs_commit_data *data)
1464 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1465 if (task->tk_status < 0)
1466 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1467 data->args.offset, data->args.count,
1468 data->res.op_status, OP_COMMIT,
1470 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1471 data->lseg, data->ds_commit_index);
1474 case -NFS4ERR_RESET_TO_PNFS:
1475 pnfs_generic_prepare_to_resend_writes(data);
1477 case -NFS4ERR_RESET_TO_MDS:
1478 pnfs_generic_prepare_to_resend_writes(data);
1481 rpc_restart_call_prepare(task);
1485 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1490 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1491 struct nfs_pgio_header *hdr)
1493 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1495 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1496 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1501 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1502 struct nfs_pgio_header *hdr)
1504 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1506 nfs4_ff_layout_stat_io_end_write(task,
1507 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1508 hdr->args.count, hdr->res.count,
1509 hdr->res.verf->committed);
1512 static int ff_layout_write_prepare_common(struct rpc_task *task,
1513 struct nfs_pgio_header *hdr)
1515 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1516 rpc_exit(task, -EIO);
1520 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1521 rpc_exit(task, -EHOSTDOWN);
1525 ff_layout_write_record_layoutstats_start(task, hdr);
1529 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1531 struct nfs_pgio_header *hdr = data;
1533 if (ff_layout_write_prepare_common(task, hdr))
1536 rpc_call_start(task);
1539 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1541 struct nfs_pgio_header *hdr = data;
1543 if (nfs4_setup_sequence(hdr->ds_clp,
1544 &hdr->args.seq_args,
1549 if (ff_layout_write_prepare_common(task, hdr))
1552 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1553 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1554 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1557 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1559 struct nfs_pgio_header *hdr = data;
1561 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1562 task->tk_status == 0) {
1563 nfs4_sequence_done(task, &hdr->res.seq_res);
1567 /* Note this may cause RPC to be resent */
1568 hdr->mds_ops->rpc_call_done(task, hdr);
1571 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1573 struct nfs_pgio_header *hdr = data;
1575 ff_layout_write_record_layoutstats_done(task, hdr);
1576 rpc_count_iostats_metrics(task,
1577 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1580 static void ff_layout_write_release(void *data)
1582 struct nfs_pgio_header *hdr = data;
1584 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1585 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1586 ff_layout_reset_write(hdr, true);
1587 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1588 ff_layout_reset_write(hdr, false);
1589 pnfs_generic_rw_release(data);
1592 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1593 struct nfs_commit_data *cdata)
1595 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1597 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1598 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1602 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1603 struct nfs_commit_data *cdata)
1605 struct nfs_page *req;
1608 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1611 if (task->tk_status == 0) {
1612 list_for_each_entry(req, &cdata->pages, wb_list)
1613 count += req->wb_bytes;
1615 nfs4_ff_layout_stat_io_end_write(task,
1616 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1617 count, count, NFS_FILE_SYNC);
1620 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1621 struct nfs_commit_data *cdata)
1623 ff_layout_commit_record_layoutstats_start(task, cdata);
1626 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1628 ff_layout_commit_prepare_common(task, data);
1629 rpc_call_start(task);
1632 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1634 struct nfs_commit_data *wdata = data;
1636 if (nfs4_setup_sequence(wdata->ds_clp,
1637 &wdata->args.seq_args,
1638 &wdata->res.seq_res,
1641 ff_layout_commit_prepare_common(task, data);
1644 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1646 pnfs_generic_write_commit_done(task, data);
1649 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1651 struct nfs_commit_data *cdata = data;
1653 ff_layout_commit_record_layoutstats_done(task, cdata);
1654 rpc_count_iostats_metrics(task,
1655 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1658 static void ff_layout_commit_release(void *data)
1660 struct nfs_commit_data *cdata = data;
1662 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1663 pnfs_generic_commit_release(data);
1666 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1667 .rpc_call_prepare = ff_layout_read_prepare_v3,
1668 .rpc_call_done = ff_layout_read_call_done,
1669 .rpc_count_stats = ff_layout_read_count_stats,
1670 .rpc_release = ff_layout_read_release,
1673 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1674 .rpc_call_prepare = ff_layout_read_prepare_v4,
1675 .rpc_call_done = ff_layout_read_call_done,
1676 .rpc_count_stats = ff_layout_read_count_stats,
1677 .rpc_release = ff_layout_read_release,
1680 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1681 .rpc_call_prepare = ff_layout_write_prepare_v3,
1682 .rpc_call_done = ff_layout_write_call_done,
1683 .rpc_count_stats = ff_layout_write_count_stats,
1684 .rpc_release = ff_layout_write_release,
1687 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1688 .rpc_call_prepare = ff_layout_write_prepare_v4,
1689 .rpc_call_done = ff_layout_write_call_done,
1690 .rpc_count_stats = ff_layout_write_count_stats,
1691 .rpc_release = ff_layout_write_release,
1694 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1695 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1696 .rpc_call_done = ff_layout_commit_done,
1697 .rpc_count_stats = ff_layout_commit_count_stats,
1698 .rpc_release = ff_layout_commit_release,
1701 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1702 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1703 .rpc_call_done = ff_layout_commit_done,
1704 .rpc_count_stats = ff_layout_commit_count_stats,
1705 .rpc_release = ff_layout_commit_release,
1708 static enum pnfs_try_status
1709 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1711 struct pnfs_layout_segment *lseg = hdr->lseg;
1712 struct nfs4_pnfs_ds *ds;
1713 struct rpc_clnt *ds_clnt;
1714 struct rpc_cred *ds_cred;
1715 loff_t offset = hdr->args.offset;
1716 u32 idx = hdr->pgio_mirror_idx;
1720 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1721 __func__, hdr->inode->i_ino,
1722 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1724 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1728 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1730 if (IS_ERR(ds_clnt))
1733 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1737 vers = nfs4_ff_layout_ds_version(lseg, idx);
1739 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1740 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1742 hdr->pgio_done_cb = ff_layout_read_done_cb;
1743 refcount_inc(&ds->ds_clp->cl_count);
1744 hdr->ds_clp = ds->ds_clp;
1745 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1749 * Note that if we ever decide to split across DSes,
1750 * then we may need to handle dense-like offsets.
1752 hdr->args.offset = offset;
1753 hdr->mds_offset = offset;
1755 /* Perform an asynchronous read to ds */
1756 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1757 vers == 3 ? &ff_layout_read_call_ops_v3 :
1758 &ff_layout_read_call_ops_v4,
1759 0, RPC_TASK_SOFTCONN);
1760 put_rpccred(ds_cred);
1761 return PNFS_ATTEMPTED;
1764 if (ff_layout_avoid_mds_available_ds(lseg))
1765 return PNFS_TRY_AGAIN;
1766 return PNFS_NOT_ATTEMPTED;
1769 /* Perform async writes. */
1770 static enum pnfs_try_status
1771 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1773 struct pnfs_layout_segment *lseg = hdr->lseg;
1774 struct nfs4_pnfs_ds *ds;
1775 struct rpc_clnt *ds_clnt;
1776 struct rpc_cred *ds_cred;
1777 loff_t offset = hdr->args.offset;
1780 int idx = hdr->pgio_mirror_idx;
1782 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1786 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1788 if (IS_ERR(ds_clnt))
1791 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1795 vers = nfs4_ff_layout_ds_version(lseg, idx);
1797 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1798 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1799 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1802 hdr->pgio_done_cb = ff_layout_write_done_cb;
1803 refcount_inc(&ds->ds_clp->cl_count);
1804 hdr->ds_clp = ds->ds_clp;
1805 hdr->ds_commit_idx = idx;
1806 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1811 * Note that if we ever decide to split across DSes,
1812 * then we may need to handle dense-like offsets.
1814 hdr->args.offset = offset;
1816 /* Perform an asynchronous write */
1817 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1818 vers == 3 ? &ff_layout_write_call_ops_v3 :
1819 &ff_layout_write_call_ops_v4,
1820 sync, RPC_TASK_SOFTCONN);
1821 put_rpccred(ds_cred);
1822 return PNFS_ATTEMPTED;
1825 if (ff_layout_avoid_mds_available_ds(lseg))
1826 return PNFS_TRY_AGAIN;
1827 return PNFS_NOT_ATTEMPTED;
1830 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1835 static struct nfs_fh *
1836 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1838 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1840 /* FIXME: Assume that there is only one NFS version available
1843 return &flseg->mirror_array[i]->fh_versions[0];
1846 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1848 struct pnfs_layout_segment *lseg = data->lseg;
1849 struct nfs4_pnfs_ds *ds;
1850 struct rpc_clnt *ds_clnt;
1851 struct rpc_cred *ds_cred;
1856 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1857 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1860 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1861 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1865 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1867 if (IS_ERR(ds_clnt))
1870 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1874 vers = nfs4_ff_layout_ds_version(lseg, idx);
1876 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1877 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1879 data->commit_done_cb = ff_layout_commit_done_cb;
1880 data->cred = ds_cred;
1881 refcount_inc(&ds->ds_clp->cl_count);
1882 data->ds_clp = ds->ds_clp;
1883 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1887 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1888 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1889 &ff_layout_commit_call_ops_v4,
1890 how, RPC_TASK_SOFTCONN);
1891 put_rpccred(ds_cred);
1894 pnfs_generic_prepare_to_resend_writes(data);
1895 pnfs_generic_commit_release(data);
1900 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1901 int how, struct nfs_commit_info *cinfo)
1903 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1904 ff_layout_initiate_commit);
1907 static struct pnfs_ds_commit_info *
1908 ff_layout_get_ds_info(struct inode *inode)
1910 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1915 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1919 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1921 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1925 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1926 const struct nfs4_layoutreturn_args *args,
1927 const struct nfs4_flexfile_layoutreturn_args *ff_args)
1931 start = xdr_reserve_space(xdr, 4);
1932 if (unlikely(!start))
1935 *start = cpu_to_be32(ff_args->num_errors);
1936 /* This assume we always return _ALL_ layouts */
1937 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
1941 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1943 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
1947 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1948 const nfs4_stateid *stateid,
1949 const struct nfs42_layoutstat_devinfo *devinfo)
1953 p = xdr_reserve_space(xdr, 8 + 8);
1954 p = xdr_encode_hyper(p, devinfo->offset);
1955 p = xdr_encode_hyper(p, devinfo->length);
1956 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1957 p = xdr_reserve_space(xdr, 4*8);
1958 p = xdr_encode_hyper(p, devinfo->read_count);
1959 p = xdr_encode_hyper(p, devinfo->read_bytes);
1960 p = xdr_encode_hyper(p, devinfo->write_count);
1961 p = xdr_encode_hyper(p, devinfo->write_bytes);
1962 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1966 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1967 const nfs4_stateid *stateid,
1968 const struct nfs42_layoutstat_devinfo *devinfo)
1970 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1971 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1972 devinfo->ld_private.data);
1975 /* report nothing for now */
1976 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
1977 const struct nfs4_layoutreturn_args *args,
1978 struct nfs4_flexfile_layoutreturn_args *ff_args)
1983 p = xdr_reserve_space(xdr, 4);
1984 *p = cpu_to_be32(ff_args->num_dev);
1985 for (i = 0; i < ff_args->num_dev; i++)
1986 ff_layout_encode_ff_iostat(xdr,
1987 &args->layout->plh_stateid,
1988 &ff_args->devinfo[i]);
1992 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
1993 unsigned int num_entries)
1997 for (i = 0; i < num_entries; i++) {
1998 if (!devinfo[i].ld_private.ops)
2000 if (!devinfo[i].ld_private.ops->free)
2002 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2006 static struct nfs4_deviceid_node *
2007 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2008 struct pnfs_device *pdev, gfp_t gfp_flags)
2010 struct nfs4_ff_layout_ds *dsaddr;
2012 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2015 return &dsaddr->id_node;
2019 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2020 const void *voidargs,
2021 const struct nfs4_xdr_opaque_data *ff_opaque)
2023 const struct nfs4_layoutreturn_args *args = voidargs;
2024 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2025 struct xdr_buf tmp_buf = {
2028 .iov_base = page_address(ff_args->pages[0]),
2031 .buflen = PAGE_SIZE,
2033 struct xdr_stream tmp_xdr;
2036 dprintk("%s: Begin\n", __func__);
2038 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2040 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2041 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2043 start = xdr_reserve_space(xdr, 4);
2044 *start = cpu_to_be32(tmp_buf.len);
2045 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2047 dprintk("%s: Return\n", __func__);
2051 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2053 struct nfs4_flexfile_layoutreturn_args *ff_args;
2057 ff_args = args->data;
2060 ff_layout_free_ds_ioerr(&ff_args->errors);
2061 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2063 put_page(ff_args->pages[0]);
2067 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2068 .encode = ff_layout_encode_layoutreturn,
2069 .free = ff_layout_free_layoutreturn,
2073 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2075 struct nfs4_flexfile_layoutreturn_args *ff_args;
2076 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2078 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2081 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2082 if (!ff_args->pages[0])
2083 goto out_nomem_free;
2085 INIT_LIST_HEAD(&ff_args->errors);
2086 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2087 &args->range, &ff_args->errors,
2088 FF_LAYOUTRETURN_MAXERR);
2090 spin_lock(&args->inode->i_lock);
2091 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2092 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2093 spin_unlock(&args->inode->i_lock);
2095 args->ld_private->ops = &layoutreturn_ops;
2096 args->ld_private->data = ff_args;
2105 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2107 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2109 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2113 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2116 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2117 const struct in6_addr *addr = &sin6->sin6_addr;
2120 * RFC 4291, Section 2.2.2
2122 * Shorthanded ANY address
2124 if (ipv6_addr_any(addr))
2125 return snprintf(buf, buflen, "::");
2128 * RFC 4291, Section 2.2.2
2130 * Shorthanded loopback address
2132 if (ipv6_addr_loopback(addr))
2133 return snprintf(buf, buflen, "::1");
2136 * RFC 4291, Section 2.2.3
2138 * Special presentation address format for mapped v4
2141 if (ipv6_addr_v4mapped(addr))
2142 return snprintf(buf, buflen, "::ffff:%pI4",
2143 &addr->s6_addr32[3]);
2146 * RFC 4291, Section 2.2.1
2148 return snprintf(buf, buflen, "%pI6c", addr);
2151 /* Derived from rpc_sockaddr2uaddr */
2153 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2155 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2156 char portbuf[RPCBIND_MAXUADDRPLEN];
2157 char addrbuf[RPCBIND_MAXUADDRLEN];
2159 unsigned short port;
2163 switch (sap->sa_family) {
2165 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2167 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2172 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2174 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2179 /* we only support tcp and tcp6 */
2184 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2185 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2187 p = xdr_reserve_space(xdr, 4 + netid_len);
2188 xdr_encode_opaque(p, netid, netid_len);
2190 p = xdr_reserve_space(xdr, 4 + len);
2191 xdr_encode_opaque(p, addrbuf, len);
2195 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2198 struct timespec64 ts;
2201 p = xdr_reserve_space(xdr, 12);
2202 ts = ktime_to_timespec64(t);
2203 p = xdr_encode_hyper(p, ts.tv_sec);
2204 *p++ = cpu_to_be32(ts.tv_nsec);
2208 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2209 struct nfs4_ff_io_stat *stat)
2213 p = xdr_reserve_space(xdr, 5 * 8);
2214 p = xdr_encode_hyper(p, stat->ops_requested);
2215 p = xdr_encode_hyper(p, stat->bytes_requested);
2216 p = xdr_encode_hyper(p, stat->ops_completed);
2217 p = xdr_encode_hyper(p, stat->bytes_completed);
2218 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2219 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2220 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2224 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2225 const struct nfs42_layoutstat_devinfo *devinfo,
2226 struct nfs4_ff_layout_mirror *mirror)
2228 struct nfs4_pnfs_ds_addr *da;
2229 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2230 struct nfs_fh *fh = &mirror->fh_versions[0];
2233 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2234 dprintk("%s: DS %s: encoding address %s\n",
2235 __func__, ds->ds_remotestr, da->da_remotestr);
2237 ff_layout_encode_netaddr(xdr, da);
2239 p = xdr_reserve_space(xdr, 4 + fh->size);
2240 xdr_encode_opaque(p, fh->data, fh->size);
2241 /* ff_io_latency4 read */
2242 spin_lock(&mirror->lock);
2243 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2244 /* ff_io_latency4 write */
2245 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2246 spin_unlock(&mirror->lock);
2248 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2250 p = xdr_reserve_space(xdr, 4);
2251 *p = cpu_to_be32(false);
2255 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2256 const struct nfs4_xdr_opaque_data *opaque)
2258 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2259 struct nfs42_layoutstat_devinfo, ld_private);
2262 /* layoutupdate length */
2263 start = xdr_reserve_space(xdr, 4);
2264 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2266 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2270 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2272 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2274 ff_layout_put_mirror(mirror);
2277 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2278 .encode = ff_layout_encode_layoutstats,
2279 .free = ff_layout_free_layoutstats,
2283 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2284 struct nfs42_layoutstat_devinfo *devinfo,
2287 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2288 struct nfs4_ff_layout_mirror *mirror;
2289 struct nfs4_deviceid_node *dev;
2292 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2295 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2297 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2299 /* mirror refcount put in cleanup_layoutstats */
2300 if (!refcount_inc_not_zero(&mirror->ref))
2302 dev = &mirror->mirror_ds->id_node;
2303 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2304 devinfo->offset = 0;
2305 devinfo->length = NFS4_MAX_UINT64;
2306 spin_lock(&mirror->lock);
2307 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2308 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2309 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2310 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2311 spin_unlock(&mirror->lock);
2312 devinfo->layout_type = LAYOUT_FLEX_FILES;
2313 devinfo->ld_private.ops = &layoutstat_ops;
2314 devinfo->ld_private.data = mirror;
2323 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2325 struct nfs4_flexfile_layout *ff_layout;
2326 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2328 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2329 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2333 spin_lock(&args->inode->i_lock);
2334 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2335 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2336 &args->devinfo[0], dev_count);
2337 spin_unlock(&args->inode->i_lock);
2338 if (!args->num_dev) {
2339 kfree(args->devinfo);
2340 args->devinfo = NULL;
2348 ff_layout_set_layoutdriver(struct nfs_server *server,
2349 const struct nfs_fh *dummy)
2351 #if IS_ENABLED(CONFIG_NFS_V4_2)
2352 server->caps |= NFS_CAP_LAYOUTSTATS;
2357 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2358 .id = LAYOUT_FLEX_FILES,
2359 .name = "LAYOUT_FLEX_FILES",
2360 .owner = THIS_MODULE,
2361 .flags = PNFS_LAYOUTGET_ON_OPEN,
2362 .set_layoutdriver = ff_layout_set_layoutdriver,
2363 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2364 .free_layout_hdr = ff_layout_free_layout_hdr,
2365 .alloc_lseg = ff_layout_alloc_lseg,
2366 .free_lseg = ff_layout_free_lseg,
2367 .add_lseg = ff_layout_add_lseg,
2368 .pg_read_ops = &ff_layout_pg_read_ops,
2369 .pg_write_ops = &ff_layout_pg_write_ops,
2370 .get_ds_info = ff_layout_get_ds_info,
2371 .free_deviceid_node = ff_layout_free_deviceid_node,
2372 .mark_request_commit = pnfs_layout_mark_request_commit,
2373 .clear_request_commit = pnfs_generic_clear_request_commit,
2374 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2375 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2376 .commit_pagelist = ff_layout_commit_pagelist,
2377 .read_pagelist = ff_layout_read_pagelist,
2378 .write_pagelist = ff_layout_write_pagelist,
2379 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2380 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2381 .sync = pnfs_nfs_generic_sync,
2382 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2385 static int __init nfs4flexfilelayout_init(void)
2387 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2389 if (!ff_zero_group) {
2390 ff_zero_group = groups_alloc(0);
2394 return pnfs_register_layoutdriver(&flexfilelayout_type);
2397 static void __exit nfs4flexfilelayout_exit(void)
2399 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2401 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2402 if (ff_zero_group) {
2403 put_group_info(ff_zero_group);
2404 ff_zero_group = NULL;
2408 MODULE_ALIAS("nfs-layouttype4-4");
2410 MODULE_LICENSE("GPL");
2411 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2413 module_init(nfs4flexfilelayout_init);
2414 module_exit(nfs4flexfilelayout_exit);