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 (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);
457 p = xdr_inline_decode(&stream, 4);
460 fh_count = be32_to_cpup(p);
462 fls->mirror_array[i]->fh_versions =
463 kzalloc(fh_count * sizeof(struct nfs_fh),
465 if (fls->mirror_array[i]->fh_versions == NULL) {
470 for (j = 0; j < fh_count; j++) {
471 rc = decode_nfs_fh(&stream,
472 &fls->mirror_array[i]->fh_versions[j]);
477 fls->mirror_array[i]->fh_versions_cnt = fh_count;
480 rc = decode_name(&stream, &id);
484 acred.uid = make_kuid(&init_user_ns, id);
487 rc = decode_name(&stream, &id);
491 acred.gid = make_kgid(&init_user_ns, id);
493 /* find the cred for it */
494 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
500 if (lgr->range.iomode == IOMODE_READ)
501 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
503 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
505 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
506 if (mirror != fls->mirror_array[i]) {
507 /* swap cred ptrs so free_mirror will clean up old */
508 if (lgr->range.iomode == IOMODE_READ) {
509 cred = xchg(&mirror->ro_cred, cred);
510 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
512 cred = xchg(&mirror->rw_cred, cred);
513 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
515 ff_layout_free_mirror(fls->mirror_array[i]);
516 fls->mirror_array[i] = mirror;
519 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
520 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
521 from_kuid(&init_user_ns, acred.uid),
522 from_kgid(&init_user_ns, acred.gid));
525 p = xdr_inline_decode(&stream, 4);
527 goto out_sort_mirrors;
528 fls->flags = be32_to_cpup(p);
530 p = xdr_inline_decode(&stream, 4);
532 goto out_sort_mirrors;
533 for (i=0; i < fls->mirror_array_cnt; i++)
534 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
537 ff_layout_sort_mirrors(fls);
538 rc = ff_layout_check_layout(lgr);
541 ret = &fls->generic_hdr;
542 dprintk("<-- %s (success)\n", __func__);
544 __free_page(scratch);
547 _ff_layout_free_lseg(fls);
549 dprintk("<-- %s (%d)\n", __func__, rc);
553 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
555 struct pnfs_layout_segment *lseg;
557 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
558 if (lseg->pls_range.iomode == IOMODE_RW)
565 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
567 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
569 dprintk("--> %s\n", __func__);
571 if (lseg->pls_range.iomode == IOMODE_RW) {
572 struct nfs4_flexfile_layout *ffl;
575 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
576 inode = ffl->generic_hdr.plh_inode;
577 spin_lock(&inode->i_lock);
578 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
579 ffl->commit_info.nbuckets = 0;
580 kfree(ffl->commit_info.buckets);
581 ffl->commit_info.buckets = NULL;
583 spin_unlock(&inode->i_lock);
585 _ff_layout_free_lseg(fls);
588 /* Return 1 until we have multiple lsegs support */
590 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
596 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
598 /* first IO request? */
599 if (atomic_inc_return(&timer->n_ops) == 1) {
600 timer->start_time = now;
605 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
609 if (atomic_dec_return(&timer->n_ops) < 0)
612 start = timer->start_time;
613 timer->start_time = now;
614 return ktime_sub(now, start);
618 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
619 struct nfs4_ff_layoutstat *layoutstat,
622 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
623 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
625 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
626 if (!mirror->start_time)
627 mirror->start_time = now;
628 if (mirror->report_interval != 0)
629 report_interval = (s64)mirror->report_interval * 1000LL;
630 else if (layoutstats_timer != 0)
631 report_interval = (s64)layoutstats_timer * 1000LL;
632 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
634 ffl->last_report_time = now;
642 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
645 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
647 iostat->ops_requested++;
648 iostat->bytes_requested += requested;
652 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
655 ktime_t time_completed,
656 ktime_t time_started)
658 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
659 ktime_t completion_time = ktime_sub(time_completed, time_started);
662 iostat->ops_completed++;
663 iostat->bytes_completed += completed;
664 iostat->bytes_not_delivered += requested - completed;
666 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
667 iostat->total_busy_time =
668 ktime_add(iostat->total_busy_time, timer);
669 iostat->aggregate_completion_time =
670 ktime_add(iostat->aggregate_completion_time,
675 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
676 struct nfs4_ff_layout_mirror *mirror,
677 __u64 requested, ktime_t now)
681 spin_lock(&mirror->lock);
682 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
683 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
684 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
685 spin_unlock(&mirror->lock);
688 pnfs_report_layoutstat(inode, GFP_KERNEL);
692 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
693 struct nfs4_ff_layout_mirror *mirror,
697 spin_lock(&mirror->lock);
698 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
699 requested, completed,
700 ktime_get(), task->tk_start);
701 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
702 spin_unlock(&mirror->lock);
706 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
707 struct nfs4_ff_layout_mirror *mirror,
708 __u64 requested, ktime_t now)
712 spin_lock(&mirror->lock);
713 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
714 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
715 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
716 spin_unlock(&mirror->lock);
719 pnfs_report_layoutstat(inode, GFP_NOIO);
723 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
724 struct nfs4_ff_layout_mirror *mirror,
727 enum nfs3_stable_how committed)
729 if (committed == NFS_UNSTABLE)
730 requested = completed = 0;
732 spin_lock(&mirror->lock);
733 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
734 requested, completed, ktime_get(), task->tk_start);
735 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
736 spin_unlock(&mirror->lock);
740 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
741 struct nfs_commit_info *cinfo,
744 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
745 struct pnfs_commit_bucket *buckets;
748 if (cinfo->ds->nbuckets != 0) {
749 /* This assumes there is only one RW lseg per file.
750 * To support multiple lseg per file, we need to
751 * change struct pnfs_commit_bucket to allow dynamic
752 * increasing nbuckets.
757 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
759 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
766 spin_lock(&cinfo->inode->i_lock);
767 if (cinfo->ds->nbuckets != 0)
770 cinfo->ds->buckets = buckets;
771 cinfo->ds->nbuckets = size;
772 for (i = 0; i < size; i++) {
773 INIT_LIST_HEAD(&buckets[i].written);
774 INIT_LIST_HEAD(&buckets[i].committing);
775 /* mark direct verifier as unset */
776 buckets[i].direct_verf.committed =
777 NFS_INVALID_STABLE_HOW;
780 spin_unlock(&cinfo->inode->i_lock);
785 static struct nfs4_pnfs_ds *
786 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
790 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
791 struct nfs4_pnfs_ds *ds;
792 bool fail_return = false;
795 /* mirrors are sorted by efficiency */
796 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
797 if (idx+1 == fls->mirror_array_cnt)
799 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
810 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
811 struct nfs_page *req,
815 pnfs_put_lseg(pgio->pg_lseg);
816 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
823 if (IS_ERR(pgio->pg_lseg)) {
824 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
825 pgio->pg_lseg = NULL;
828 /* If we don't have checking, do get a IOMODE_RW
829 * segment, and the server wants to avoid READs
832 if (pgio->pg_lseg && !strict_iomode &&
833 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
834 strict_iomode = true;
840 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
841 struct nfs_page *req)
843 struct nfs_pgio_mirror *pgm;
844 struct nfs4_ff_layout_mirror *mirror;
845 struct nfs4_pnfs_ds *ds;
849 pnfs_generic_pg_check_layout(pgio);
850 /* Use full layout for now */
852 ff_layout_pg_get_read(pgio, req, false);
853 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
854 ff_layout_pg_get_read(pgio, req, true);
856 /* If no lseg, fall back to read through mds */
857 if (pgio->pg_lseg == NULL)
860 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
862 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
864 pnfs_put_lseg(pgio->pg_lseg);
865 pgio->pg_lseg = NULL;
866 /* Sleep for 1 second before retrying */
871 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
873 pgio->pg_mirror_idx = ds_idx;
875 /* read always uses only one mirror - idx 0 for pgio layer */
876 pgm = &pgio->pg_mirrors[0];
877 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
881 pnfs_put_lseg(pgio->pg_lseg);
882 pgio->pg_lseg = NULL;
883 nfs_pageio_reset_read_mds(pgio);
887 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
888 struct nfs_page *req)
890 struct nfs4_ff_layout_mirror *mirror;
891 struct nfs_pgio_mirror *pgm;
892 struct nfs_commit_info cinfo;
893 struct nfs4_pnfs_ds *ds;
898 pnfs_generic_pg_check_layout(pgio);
899 if (!pgio->pg_lseg) {
900 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
907 if (IS_ERR(pgio->pg_lseg)) {
908 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
909 pgio->pg_lseg = NULL;
913 /* If no lseg, fall back to write through mds */
914 if (pgio->pg_lseg == NULL)
917 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
918 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
922 /* Use a direct mapping of ds_idx to pgio mirror_idx */
923 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
924 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;
946 pnfs_put_lseg(pgio->pg_lseg);
947 pgio->pg_lseg = NULL;
948 nfs_pageio_reset_write_mds(pgio);
952 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
953 struct nfs_page *req)
955 if (!pgio->pg_lseg) {
956 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
963 if (IS_ERR(pgio->pg_lseg)) {
964 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
965 pgio->pg_lseg = NULL;
970 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
972 /* no lseg means that pnfs is not in use, so no mirroring here */
973 nfs_pageio_reset_write_mds(pgio);
978 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
979 .pg_init = ff_layout_pg_init_read,
980 .pg_test = pnfs_generic_pg_test,
981 .pg_doio = pnfs_generic_pg_readpages,
982 .pg_cleanup = pnfs_generic_pg_cleanup,
985 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
986 .pg_init = ff_layout_pg_init_write,
987 .pg_test = pnfs_generic_pg_test,
988 .pg_doio = pnfs_generic_pg_writepages,
989 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
990 .pg_cleanup = pnfs_generic_pg_cleanup,
993 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
995 struct rpc_task *task = &hdr->task;
997 pnfs_layoutcommit_inode(hdr->inode, false);
1000 dprintk("%s Reset task %5u for i/o through pNFS "
1001 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1003 hdr->inode->i_sb->s_id,
1004 (unsigned long long)NFS_FILEID(hdr->inode),
1006 (unsigned long long)hdr->args.offset);
1008 hdr->completion_ops->reschedule_io(hdr);
1012 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1013 dprintk("%s Reset task %5u for i/o through MDS "
1014 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1016 hdr->inode->i_sb->s_id,
1017 (unsigned long long)NFS_FILEID(hdr->inode),
1019 (unsigned long long)hdr->args.offset);
1021 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1025 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1027 struct rpc_task *task = &hdr->task;
1029 pnfs_layoutcommit_inode(hdr->inode, false);
1031 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1032 dprintk("%s Reset task %5u for i/o through MDS "
1033 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1035 hdr->inode->i_sb->s_id,
1036 (unsigned long long)NFS_FILEID(hdr->inode),
1038 (unsigned long long)hdr->args.offset);
1040 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1044 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1045 struct nfs4_state *state,
1046 struct nfs_client *clp,
1047 struct pnfs_layout_segment *lseg,
1050 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1051 struct inode *inode = lo->plh_inode;
1052 struct nfs_server *mds_server = NFS_SERVER(inode);
1054 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1055 struct nfs_client *mds_client = mds_server->nfs_client;
1056 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1058 switch (task->tk_status) {
1059 /* MDS state errors */
1060 case -NFS4ERR_DELEG_REVOKED:
1061 case -NFS4ERR_ADMIN_REVOKED:
1062 case -NFS4ERR_BAD_STATEID:
1065 nfs_remove_bad_delegation(state->inode, NULL);
1066 case -NFS4ERR_OPENMODE:
1069 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1070 goto out_bad_stateid;
1071 goto wait_on_recovery;
1072 case -NFS4ERR_EXPIRED:
1073 if (state != NULL) {
1074 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1075 goto out_bad_stateid;
1077 nfs4_schedule_lease_recovery(mds_client);
1078 goto wait_on_recovery;
1079 /* DS session errors */
1080 case -NFS4ERR_BADSESSION:
1081 case -NFS4ERR_BADSLOT:
1082 case -NFS4ERR_BAD_HIGH_SLOT:
1083 case -NFS4ERR_DEADSESSION:
1084 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1085 case -NFS4ERR_SEQ_FALSE_RETRY:
1086 case -NFS4ERR_SEQ_MISORDERED:
1087 dprintk("%s ERROR %d, Reset session. Exchangeid "
1088 "flags 0x%x\n", __func__, task->tk_status,
1089 clp->cl_exchange_flags);
1090 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1092 case -NFS4ERR_DELAY:
1093 case -NFS4ERR_GRACE:
1094 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1096 case -NFS4ERR_RETRY_UNCACHED_REP:
1098 /* Invalidate Layout errors */
1099 case -NFS4ERR_PNFS_NO_LAYOUT:
1100 case -ESTALE: /* mapped NFS4ERR_STALE */
1101 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1102 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1103 case -NFS4ERR_FHEXPIRED:
1104 case -NFS4ERR_WRONG_TYPE:
1105 dprintk("%s Invalid layout error %d\n", __func__,
1108 * Destroy layout so new i/o will get a new layout.
1109 * Layout will not be destroyed until all current lseg
1110 * references are put. Mark layout as invalid to resend failed
1111 * i/o and all i/o waiting on the slot table to the MDS until
1112 * layout is destroyed and a new valid layout is obtained.
1114 pnfs_destroy_layout(NFS_I(inode));
1115 rpc_wake_up(&tbl->slot_tbl_waitq);
1117 /* RPC connection errors */
1125 dprintk("%s DS connection error %d\n", __func__,
1127 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1129 rpc_wake_up(&tbl->slot_tbl_waitq);
1132 if (ff_layout_avoid_mds_available_ds(lseg))
1133 return -NFS4ERR_RESET_TO_PNFS;
1135 dprintk("%s Retry through MDS. Error %d\n", __func__,
1137 return -NFS4ERR_RESET_TO_MDS;
1140 task->tk_status = 0;
1143 task->tk_status = -EIO;
1146 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1147 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1148 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1152 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1153 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1154 struct pnfs_layout_segment *lseg,
1157 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1159 switch (task->tk_status) {
1160 /* File access problems. Don't mark the device as unavailable */
1169 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1172 dprintk("%s DS connection error %d\n", __func__,
1174 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1177 /* FIXME: Need to prevent infinite looping here. */
1178 return -NFS4ERR_RESET_TO_PNFS;
1180 task->tk_status = 0;
1181 rpc_restart_call_prepare(task);
1182 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1186 static int ff_layout_async_handle_error(struct rpc_task *task,
1187 struct nfs4_state *state,
1188 struct nfs_client *clp,
1189 struct pnfs_layout_segment *lseg,
1192 int vers = clp->cl_nfs_mod->rpc_vers->number;
1194 if (task->tk_status >= 0)
1197 /* Handle the case of an invalid layout segment */
1198 if (!pnfs_is_valid_lseg(lseg))
1199 return -NFS4ERR_RESET_TO_PNFS;
1203 return ff_layout_async_handle_error_v3(task, lseg, idx);
1205 return ff_layout_async_handle_error_v4(task, state, clp,
1208 /* should never happen */
1214 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1215 int idx, u64 offset, u64 length,
1216 u32 status, int opnum, int error)
1218 struct nfs4_ff_layout_mirror *mirror;
1225 case -EPROTONOSUPPORT:
1236 status = NFS4ERR_NXIO;
1239 status = NFS4ERR_ACCESS;
1254 mirror = FF_LAYOUT_COMP(lseg, idx);
1255 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1256 mirror, offset, length, status, opnum,
1258 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1259 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1262 /* NFS_PROTO call done callback routines */
1263 static int ff_layout_read_done_cb(struct rpc_task *task,
1264 struct nfs_pgio_header *hdr)
1268 trace_nfs4_pnfs_read(hdr, task->tk_status);
1269 if (task->tk_status < 0)
1270 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1271 hdr->args.offset, hdr->args.count,
1272 hdr->res.op_status, OP_READ,
1274 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1275 hdr->ds_clp, hdr->lseg,
1276 hdr->pgio_mirror_idx);
1279 case -NFS4ERR_RESET_TO_PNFS:
1280 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1281 hdr->pgio_mirror_idx + 1,
1282 &hdr->pgio_mirror_idx))
1284 ff_layout_read_record_layoutstats_done(task, hdr);
1285 pnfs_read_resend_pnfs(hdr);
1286 return task->tk_status;
1287 case -NFS4ERR_RESET_TO_MDS:
1288 ff_layout_reset_read(hdr);
1289 return task->tk_status;
1296 rpc_restart_call_prepare(task);
1301 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1303 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1307 * We reference the rpc_cred of the first WRITE that triggers the need for
1308 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1309 * rfc5661 is not clear about which credential should be used.
1311 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1312 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1313 * we always send layoutcommit after DS writes.
1316 ff_layout_set_layoutcommit(struct inode *inode,
1317 struct pnfs_layout_segment *lseg,
1320 if (!ff_layout_need_layoutcommit(lseg))
1323 pnfs_set_layoutcommit(inode, lseg, end_offset);
1324 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1325 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1329 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
1331 /* No mirroring for now */
1332 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1334 return ff_layout_test_devid_unavailable(node);
1337 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1338 struct nfs_pgio_header *hdr)
1340 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1342 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1343 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1348 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1349 struct nfs_pgio_header *hdr)
1351 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1353 nfs4_ff_layout_stat_io_end_read(task,
1354 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1359 static int ff_layout_read_prepare_common(struct rpc_task *task,
1360 struct nfs_pgio_header *hdr)
1362 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1363 rpc_exit(task, -EIO);
1366 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1367 rpc_exit(task, -EHOSTDOWN);
1371 ff_layout_read_record_layoutstats_start(task, hdr);
1376 * Call ops for the async read/write cases
1377 * In the case of dense layouts, the offset needs to be reset to its
1380 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1382 struct nfs_pgio_header *hdr = data;
1384 if (ff_layout_read_prepare_common(task, hdr))
1387 rpc_call_start(task);
1390 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1392 struct nfs_pgio_header *hdr = data;
1394 if (nfs4_setup_sequence(hdr->ds_clp,
1395 &hdr->args.seq_args,
1400 if (ff_layout_read_prepare_common(task, hdr))
1403 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1404 hdr->args.lock_context, FMODE_READ) == -EIO)
1405 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1408 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1410 struct nfs_pgio_header *hdr = data;
1412 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1414 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1415 task->tk_status == 0) {
1416 nfs4_sequence_done(task, &hdr->res.seq_res);
1420 /* Note this may cause RPC to be resent */
1421 hdr->mds_ops->rpc_call_done(task, hdr);
1424 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1426 struct nfs_pgio_header *hdr = data;
1428 ff_layout_read_record_layoutstats_done(task, hdr);
1429 rpc_count_iostats_metrics(task,
1430 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1433 static void ff_layout_read_release(void *data)
1435 struct nfs_pgio_header *hdr = data;
1437 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1438 pnfs_generic_rw_release(data);
1442 static int ff_layout_write_done_cb(struct rpc_task *task,
1443 struct nfs_pgio_header *hdr)
1445 loff_t end_offs = 0;
1448 trace_nfs4_pnfs_write(hdr, task->tk_status);
1449 if (task->tk_status < 0)
1450 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1451 hdr->args.offset, hdr->args.count,
1452 hdr->res.op_status, OP_WRITE,
1454 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1455 hdr->ds_clp, hdr->lseg,
1456 hdr->pgio_mirror_idx);
1459 case -NFS4ERR_RESET_TO_PNFS:
1460 ff_layout_reset_write(hdr, true);
1461 return task->tk_status;
1462 case -NFS4ERR_RESET_TO_MDS:
1463 ff_layout_reset_write(hdr, false);
1464 return task->tk_status;
1469 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1470 hdr->res.verf->committed == NFS_DATA_SYNC)
1471 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1473 /* Note: if the write is unstable, don't set end_offs until commit */
1474 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1476 /* zero out fattr since we don't care DS attr at all */
1477 hdr->fattr.valid = 0;
1478 if (task->tk_status >= 0)
1479 nfs_writeback_update_inode(hdr);
1484 static int ff_layout_commit_done_cb(struct rpc_task *task,
1485 struct nfs_commit_data *data)
1489 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1490 if (task->tk_status < 0)
1491 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1492 data->args.offset, data->args.count,
1493 data->res.op_status, OP_COMMIT,
1495 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1496 data->lseg, data->ds_commit_index);
1499 case -NFS4ERR_RESET_TO_PNFS:
1500 pnfs_generic_prepare_to_resend_writes(data);
1502 case -NFS4ERR_RESET_TO_MDS:
1503 pnfs_generic_prepare_to_resend_writes(data);
1506 rpc_restart_call_prepare(task);
1510 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1515 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1516 struct nfs_pgio_header *hdr)
1518 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1520 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1521 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1526 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1527 struct nfs_pgio_header *hdr)
1529 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1531 nfs4_ff_layout_stat_io_end_write(task,
1532 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1533 hdr->args.count, hdr->res.count,
1534 hdr->res.verf->committed);
1537 static int ff_layout_write_prepare_common(struct rpc_task *task,
1538 struct nfs_pgio_header *hdr)
1540 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1541 rpc_exit(task, -EIO);
1545 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1546 rpc_exit(task, -EHOSTDOWN);
1550 ff_layout_write_record_layoutstats_start(task, hdr);
1554 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1556 struct nfs_pgio_header *hdr = data;
1558 if (ff_layout_write_prepare_common(task, hdr))
1561 rpc_call_start(task);
1564 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1566 struct nfs_pgio_header *hdr = data;
1568 if (nfs4_setup_sequence(hdr->ds_clp,
1569 &hdr->args.seq_args,
1574 if (ff_layout_write_prepare_common(task, hdr))
1577 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1578 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1579 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1582 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1584 struct nfs_pgio_header *hdr = data;
1586 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1587 task->tk_status == 0) {
1588 nfs4_sequence_done(task, &hdr->res.seq_res);
1592 /* Note this may cause RPC to be resent */
1593 hdr->mds_ops->rpc_call_done(task, hdr);
1596 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1598 struct nfs_pgio_header *hdr = data;
1600 ff_layout_write_record_layoutstats_done(task, hdr);
1601 rpc_count_iostats_metrics(task,
1602 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1605 static void ff_layout_write_release(void *data)
1607 struct nfs_pgio_header *hdr = data;
1609 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1610 pnfs_generic_rw_release(data);
1613 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1614 struct nfs_commit_data *cdata)
1616 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1618 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1619 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1623 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1624 struct nfs_commit_data *cdata)
1626 struct nfs_page *req;
1629 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1632 if (task->tk_status == 0) {
1633 list_for_each_entry(req, &cdata->pages, wb_list)
1634 count += req->wb_bytes;
1636 nfs4_ff_layout_stat_io_end_write(task,
1637 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1638 count, count, NFS_FILE_SYNC);
1641 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1642 struct nfs_commit_data *cdata)
1644 ff_layout_commit_record_layoutstats_start(task, cdata);
1647 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1649 ff_layout_commit_prepare_common(task, data);
1650 rpc_call_start(task);
1653 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1655 struct nfs_commit_data *wdata = data;
1657 if (nfs4_setup_sequence(wdata->ds_clp,
1658 &wdata->args.seq_args,
1659 &wdata->res.seq_res,
1662 ff_layout_commit_prepare_common(task, data);
1665 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1667 pnfs_generic_write_commit_done(task, data);
1670 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1672 struct nfs_commit_data *cdata = data;
1674 ff_layout_commit_record_layoutstats_done(task, cdata);
1675 rpc_count_iostats_metrics(task,
1676 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1679 static void ff_layout_commit_release(void *data)
1681 struct nfs_commit_data *cdata = data;
1683 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1684 pnfs_generic_commit_release(data);
1687 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1688 .rpc_call_prepare = ff_layout_read_prepare_v3,
1689 .rpc_call_done = ff_layout_read_call_done,
1690 .rpc_count_stats = ff_layout_read_count_stats,
1691 .rpc_release = ff_layout_read_release,
1694 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1695 .rpc_call_prepare = ff_layout_read_prepare_v4,
1696 .rpc_call_done = ff_layout_read_call_done,
1697 .rpc_count_stats = ff_layout_read_count_stats,
1698 .rpc_release = ff_layout_read_release,
1701 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1702 .rpc_call_prepare = ff_layout_write_prepare_v3,
1703 .rpc_call_done = ff_layout_write_call_done,
1704 .rpc_count_stats = ff_layout_write_count_stats,
1705 .rpc_release = ff_layout_write_release,
1708 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1709 .rpc_call_prepare = ff_layout_write_prepare_v4,
1710 .rpc_call_done = ff_layout_write_call_done,
1711 .rpc_count_stats = ff_layout_write_count_stats,
1712 .rpc_release = ff_layout_write_release,
1715 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1716 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1717 .rpc_call_done = ff_layout_commit_done,
1718 .rpc_count_stats = ff_layout_commit_count_stats,
1719 .rpc_release = ff_layout_commit_release,
1722 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1723 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1724 .rpc_call_done = ff_layout_commit_done,
1725 .rpc_count_stats = ff_layout_commit_count_stats,
1726 .rpc_release = ff_layout_commit_release,
1729 static enum pnfs_try_status
1730 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1732 struct pnfs_layout_segment *lseg = hdr->lseg;
1733 struct nfs4_pnfs_ds *ds;
1734 struct rpc_clnt *ds_clnt;
1735 struct rpc_cred *ds_cred;
1736 loff_t offset = hdr->args.offset;
1737 u32 idx = hdr->pgio_mirror_idx;
1741 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1742 __func__, hdr->inode->i_ino,
1743 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1745 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1749 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1751 if (IS_ERR(ds_clnt))
1754 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1758 vers = nfs4_ff_layout_ds_version(lseg, idx);
1760 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1761 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1763 hdr->pgio_done_cb = ff_layout_read_done_cb;
1764 atomic_inc(&ds->ds_clp->cl_count);
1765 hdr->ds_clp = ds->ds_clp;
1766 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1770 * Note that if we ever decide to split across DSes,
1771 * then we may need to handle dense-like offsets.
1773 hdr->args.offset = offset;
1774 hdr->mds_offset = offset;
1776 /* Perform an asynchronous read to ds */
1777 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1778 vers == 3 ? &ff_layout_read_call_ops_v3 :
1779 &ff_layout_read_call_ops_v4,
1780 0, RPC_TASK_SOFTCONN);
1781 put_rpccred(ds_cred);
1782 return PNFS_ATTEMPTED;
1785 if (ff_layout_avoid_mds_available_ds(lseg))
1786 return PNFS_TRY_AGAIN;
1787 return PNFS_NOT_ATTEMPTED;
1790 /* Perform async writes. */
1791 static enum pnfs_try_status
1792 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1794 struct pnfs_layout_segment *lseg = hdr->lseg;
1795 struct nfs4_pnfs_ds *ds;
1796 struct rpc_clnt *ds_clnt;
1797 struct rpc_cred *ds_cred;
1798 loff_t offset = hdr->args.offset;
1801 int idx = hdr->pgio_mirror_idx;
1803 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1807 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1809 if (IS_ERR(ds_clnt))
1812 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1816 vers = nfs4_ff_layout_ds_version(lseg, idx);
1818 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1819 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1820 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1823 hdr->pgio_done_cb = ff_layout_write_done_cb;
1824 atomic_inc(&ds->ds_clp->cl_count);
1825 hdr->ds_clp = ds->ds_clp;
1826 hdr->ds_commit_idx = idx;
1827 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1832 * Note that if we ever decide to split across DSes,
1833 * then we may need to handle dense-like offsets.
1835 hdr->args.offset = offset;
1837 /* Perform an asynchronous write */
1838 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1839 vers == 3 ? &ff_layout_write_call_ops_v3 :
1840 &ff_layout_write_call_ops_v4,
1841 sync, RPC_TASK_SOFTCONN);
1842 put_rpccred(ds_cred);
1843 return PNFS_ATTEMPTED;
1846 if (ff_layout_avoid_mds_available_ds(lseg))
1847 return PNFS_TRY_AGAIN;
1848 return PNFS_NOT_ATTEMPTED;
1851 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1856 static struct nfs_fh *
1857 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1859 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1861 /* FIXME: Assume that there is only one NFS version available
1864 return &flseg->mirror_array[i]->fh_versions[0];
1867 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1869 struct pnfs_layout_segment *lseg = data->lseg;
1870 struct nfs4_pnfs_ds *ds;
1871 struct rpc_clnt *ds_clnt;
1872 struct rpc_cred *ds_cred;
1877 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1878 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1882 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1884 if (IS_ERR(ds_clnt))
1887 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1891 vers = nfs4_ff_layout_ds_version(lseg, idx);
1893 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1894 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1896 data->commit_done_cb = ff_layout_commit_done_cb;
1897 data->cred = ds_cred;
1898 atomic_inc(&ds->ds_clp->cl_count);
1899 data->ds_clp = ds->ds_clp;
1900 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1904 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1905 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1906 &ff_layout_commit_call_ops_v4,
1907 how, RPC_TASK_SOFTCONN);
1908 put_rpccred(ds_cred);
1911 pnfs_generic_prepare_to_resend_writes(data);
1912 pnfs_generic_commit_release(data);
1917 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1918 int how, struct nfs_commit_info *cinfo)
1920 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1921 ff_layout_initiate_commit);
1924 static struct pnfs_ds_commit_info *
1925 ff_layout_get_ds_info(struct inode *inode)
1927 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1932 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1936 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1938 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1942 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1943 const struct nfs4_layoutreturn_args *args,
1944 const struct nfs4_flexfile_layoutreturn_args *ff_args)
1948 start = xdr_reserve_space(xdr, 4);
1949 if (unlikely(!start))
1952 *start = cpu_to_be32(ff_args->num_errors);
1953 /* This assume we always return _ALL_ layouts */
1954 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
1958 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1960 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
1964 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1965 const nfs4_stateid *stateid,
1966 const struct nfs42_layoutstat_devinfo *devinfo)
1970 p = xdr_reserve_space(xdr, 8 + 8);
1971 p = xdr_encode_hyper(p, devinfo->offset);
1972 p = xdr_encode_hyper(p, devinfo->length);
1973 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1974 p = xdr_reserve_space(xdr, 4*8);
1975 p = xdr_encode_hyper(p, devinfo->read_count);
1976 p = xdr_encode_hyper(p, devinfo->read_bytes);
1977 p = xdr_encode_hyper(p, devinfo->write_count);
1978 p = xdr_encode_hyper(p, devinfo->write_bytes);
1979 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1983 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1984 const nfs4_stateid *stateid,
1985 const struct nfs42_layoutstat_devinfo *devinfo)
1987 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1988 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1989 devinfo->ld_private.data);
1992 /* report nothing for now */
1993 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
1994 const struct nfs4_layoutreturn_args *args,
1995 struct nfs4_flexfile_layoutreturn_args *ff_args)
2000 p = xdr_reserve_space(xdr, 4);
2001 *p = cpu_to_be32(ff_args->num_dev);
2002 for (i = 0; i < ff_args->num_dev; i++)
2003 ff_layout_encode_ff_iostat(xdr,
2004 &args->layout->plh_stateid,
2005 &ff_args->devinfo[i]);
2009 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2010 unsigned int num_entries)
2014 for (i = 0; i < num_entries; i++) {
2015 if (!devinfo[i].ld_private.ops)
2017 if (!devinfo[i].ld_private.ops->free)
2019 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2023 static struct nfs4_deviceid_node *
2024 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2025 struct pnfs_device *pdev, gfp_t gfp_flags)
2027 struct nfs4_ff_layout_ds *dsaddr;
2029 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2032 return &dsaddr->id_node;
2036 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2037 const void *voidargs,
2038 const struct nfs4_xdr_opaque_data *ff_opaque)
2040 const struct nfs4_layoutreturn_args *args = voidargs;
2041 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2042 struct xdr_buf tmp_buf = {
2045 .iov_base = page_address(ff_args->pages[0]),
2048 .buflen = PAGE_SIZE,
2050 struct xdr_stream tmp_xdr;
2053 dprintk("%s: Begin\n", __func__);
2055 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2057 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2058 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2060 start = xdr_reserve_space(xdr, 4);
2061 *start = cpu_to_be32(tmp_buf.len);
2062 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2064 dprintk("%s: Return\n", __func__);
2068 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2070 struct nfs4_flexfile_layoutreturn_args *ff_args;
2074 ff_args = args->data;
2077 ff_layout_free_ds_ioerr(&ff_args->errors);
2078 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2080 put_page(ff_args->pages[0]);
2084 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2085 .encode = ff_layout_encode_layoutreturn,
2086 .free = ff_layout_free_layoutreturn,
2090 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2092 struct nfs4_flexfile_layoutreturn_args *ff_args;
2093 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2095 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2098 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2099 if (!ff_args->pages[0])
2100 goto out_nomem_free;
2102 INIT_LIST_HEAD(&ff_args->errors);
2103 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2104 &args->range, &ff_args->errors,
2105 FF_LAYOUTRETURN_MAXERR);
2107 spin_lock(&args->inode->i_lock);
2108 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2109 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2110 spin_unlock(&args->inode->i_lock);
2112 args->ld_private->ops = &layoutreturn_ops;
2113 args->ld_private->data = ff_args;
2122 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2124 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2126 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2130 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2133 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2134 const struct in6_addr *addr = &sin6->sin6_addr;
2137 * RFC 4291, Section 2.2.2
2139 * Shorthanded ANY address
2141 if (ipv6_addr_any(addr))
2142 return snprintf(buf, buflen, "::");
2145 * RFC 4291, Section 2.2.2
2147 * Shorthanded loopback address
2149 if (ipv6_addr_loopback(addr))
2150 return snprintf(buf, buflen, "::1");
2153 * RFC 4291, Section 2.2.3
2155 * Special presentation address format for mapped v4
2158 if (ipv6_addr_v4mapped(addr))
2159 return snprintf(buf, buflen, "::ffff:%pI4",
2160 &addr->s6_addr32[3]);
2163 * RFC 4291, Section 2.2.1
2165 return snprintf(buf, buflen, "%pI6c", addr);
2168 /* Derived from rpc_sockaddr2uaddr */
2170 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2172 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2173 char portbuf[RPCBIND_MAXUADDRPLEN];
2174 char addrbuf[RPCBIND_MAXUADDRLEN];
2176 unsigned short port;
2180 switch (sap->sa_family) {
2182 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2184 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2189 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2191 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2196 /* we only support tcp and tcp6 */
2201 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2202 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2204 p = xdr_reserve_space(xdr, 4 + netid_len);
2205 xdr_encode_opaque(p, netid, netid_len);
2207 p = xdr_reserve_space(xdr, 4 + len);
2208 xdr_encode_opaque(p, addrbuf, len);
2212 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2215 struct timespec64 ts;
2218 p = xdr_reserve_space(xdr, 12);
2219 ts = ktime_to_timespec64(t);
2220 p = xdr_encode_hyper(p, ts.tv_sec);
2221 *p++ = cpu_to_be32(ts.tv_nsec);
2225 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2226 struct nfs4_ff_io_stat *stat)
2230 p = xdr_reserve_space(xdr, 5 * 8);
2231 p = xdr_encode_hyper(p, stat->ops_requested);
2232 p = xdr_encode_hyper(p, stat->bytes_requested);
2233 p = xdr_encode_hyper(p, stat->ops_completed);
2234 p = xdr_encode_hyper(p, stat->bytes_completed);
2235 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2236 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2237 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2241 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2242 const struct nfs42_layoutstat_devinfo *devinfo,
2243 struct nfs4_ff_layout_mirror *mirror)
2245 struct nfs4_pnfs_ds_addr *da;
2246 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2247 struct nfs_fh *fh = &mirror->fh_versions[0];
2250 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2251 dprintk("%s: DS %s: encoding address %s\n",
2252 __func__, ds->ds_remotestr, da->da_remotestr);
2254 ff_layout_encode_netaddr(xdr, da);
2256 p = xdr_reserve_space(xdr, 4 + fh->size);
2257 xdr_encode_opaque(p, fh->data, fh->size);
2258 /* ff_io_latency4 read */
2259 spin_lock(&mirror->lock);
2260 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2261 /* ff_io_latency4 write */
2262 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2263 spin_unlock(&mirror->lock);
2265 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2267 p = xdr_reserve_space(xdr, 4);
2268 *p = cpu_to_be32(false);
2272 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2273 const struct nfs4_xdr_opaque_data *opaque)
2275 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2276 struct nfs42_layoutstat_devinfo, ld_private);
2279 /* layoutupdate length */
2280 start = xdr_reserve_space(xdr, 4);
2281 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2283 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2287 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2289 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2291 ff_layout_put_mirror(mirror);
2294 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2295 .encode = ff_layout_encode_layoutstats,
2296 .free = ff_layout_free_layoutstats,
2300 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2301 struct nfs42_layoutstat_devinfo *devinfo,
2304 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2305 struct nfs4_ff_layout_mirror *mirror;
2306 struct nfs4_deviceid_node *dev;
2309 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2312 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2314 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2316 /* mirror refcount put in cleanup_layoutstats */
2317 if (!atomic_inc_not_zero(&mirror->ref))
2319 dev = &mirror->mirror_ds->id_node;
2320 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2321 devinfo->offset = 0;
2322 devinfo->length = NFS4_MAX_UINT64;
2323 spin_lock(&mirror->lock);
2324 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2325 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2326 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2327 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2328 spin_unlock(&mirror->lock);
2329 devinfo->layout_type = LAYOUT_FLEX_FILES;
2330 devinfo->ld_private.ops = &layoutstat_ops;
2331 devinfo->ld_private.data = mirror;
2340 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2342 struct nfs4_flexfile_layout *ff_layout;
2343 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2345 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2346 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2350 spin_lock(&args->inode->i_lock);
2351 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2352 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2353 &args->devinfo[0], dev_count);
2354 spin_unlock(&args->inode->i_lock);
2355 if (!args->num_dev) {
2356 kfree(args->devinfo);
2357 args->devinfo = NULL;
2365 ff_layout_set_layoutdriver(struct nfs_server *server,
2366 const struct nfs_fh *dummy)
2368 #if IS_ENABLED(CONFIG_NFS_V4_2)
2369 server->caps |= NFS_CAP_LAYOUTSTATS;
2374 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2375 .id = LAYOUT_FLEX_FILES,
2376 .name = "LAYOUT_FLEX_FILES",
2377 .owner = THIS_MODULE,
2378 .set_layoutdriver = ff_layout_set_layoutdriver,
2379 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2380 .free_layout_hdr = ff_layout_free_layout_hdr,
2381 .alloc_lseg = ff_layout_alloc_lseg,
2382 .free_lseg = ff_layout_free_lseg,
2383 .add_lseg = ff_layout_add_lseg,
2384 .pg_read_ops = &ff_layout_pg_read_ops,
2385 .pg_write_ops = &ff_layout_pg_write_ops,
2386 .get_ds_info = ff_layout_get_ds_info,
2387 .free_deviceid_node = ff_layout_free_deviceid_node,
2388 .mark_request_commit = pnfs_layout_mark_request_commit,
2389 .clear_request_commit = pnfs_generic_clear_request_commit,
2390 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2391 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2392 .commit_pagelist = ff_layout_commit_pagelist,
2393 .read_pagelist = ff_layout_read_pagelist,
2394 .write_pagelist = ff_layout_write_pagelist,
2395 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2396 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2397 .sync = pnfs_nfs_generic_sync,
2398 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2401 static int __init nfs4flexfilelayout_init(void)
2403 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2405 if (!ff_zero_group) {
2406 ff_zero_group = groups_alloc(0);
2410 return pnfs_register_layoutdriver(&flexfilelayout_type);
2413 static void __exit nfs4flexfilelayout_exit(void)
2415 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2417 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2418 if (ff_zero_group) {
2419 put_group_info(ff_zero_group);
2420 ff_zero_group = NULL;
2424 MODULE_ALIAS("nfs-layouttype4-4");
2426 MODULE_LICENSE("GPL");
2427 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2429 module_init(nfs4flexfilelayout_init);
2430 module_exit(nfs4flexfilelayout_exit);