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>
12 #include <linux/sched/mm.h>
14 #include <linux/sunrpc/metrics.h>
16 #include "flexfilelayout.h"
17 #include "../nfs4session.h"
18 #include "../nfs4idmap.h"
19 #include "../internal.h"
20 #include "../delegation.h"
21 #include "../nfs4trace.h"
22 #include "../iostat.h"
26 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
28 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
29 #define FF_LAYOUTRETURN_MAXERR 20
31 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
32 struct nfs_pgio_header *hdr);
33 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
34 struct nfs42_layoutstat_devinfo *devinfo,
36 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
37 const struct nfs42_layoutstat_devinfo *devinfo,
38 struct nfs4_ff_layout_mirror *mirror);
40 static struct pnfs_layout_hdr *
41 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
43 struct nfs4_flexfile_layout *ffl;
45 ffl = kzalloc(sizeof(*ffl), gfp_flags);
47 INIT_LIST_HEAD(&ffl->error_list);
48 INIT_LIST_HEAD(&ffl->mirrors);
49 ffl->last_report_time = ktime_get();
50 return &ffl->generic_hdr;
56 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
58 struct nfs4_ff_layout_ds_err *err, *n;
60 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
65 kfree(FF_LAYOUT_FROM_HDR(lo));
68 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
72 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
73 if (unlikely(p == NULL))
75 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
76 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
77 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
78 p[0], p[1], p[2], p[3]);
82 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
86 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
89 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
90 nfs4_print_deviceid(devid);
94 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
98 p = xdr_inline_decode(xdr, 4);
101 fh->size = be32_to_cpup(p++);
102 if (fh->size > sizeof(struct nfs_fh)) {
103 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
108 p = xdr_inline_decode(xdr, fh->size);
111 memcpy(&fh->data, p, fh->size);
112 dprintk("%s: fh len %d\n", __func__, fh->size);
118 * Currently only stringified uids and gids are accepted.
119 * I.e., kerberos is not supported to the DSes, so no pricipals.
121 * That means that one common function will suffice, but when
122 * principals are added, this should be split to accomodate
123 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
126 decode_name(struct xdr_stream *xdr, u32 *id)
131 /* opaque_length(4)*/
132 p = xdr_inline_decode(xdr, 4);
135 len = be32_to_cpup(p++);
139 dprintk("%s: len %u\n", __func__, len);
142 p = xdr_inline_decode(xdr, len);
146 if (!nfs_map_string_to_numeric((char *)p, len, id))
152 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
153 const struct nfs4_ff_layout_mirror *m2)
157 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
159 for (i = 0; i < m1->fh_versions_cnt; i++) {
160 bool found_fh = false;
161 for (j = 0; j < m2->fh_versions_cnt; j++) {
162 if (nfs_compare_fh(&m1->fh_versions[i],
163 &m2->fh_versions[j]) == 0) {
174 static struct nfs4_ff_layout_mirror *
175 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
176 struct nfs4_ff_layout_mirror *mirror)
178 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
179 struct nfs4_ff_layout_mirror *pos;
180 struct inode *inode = lo->plh_inode;
182 spin_lock(&inode->i_lock);
183 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
184 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
186 if (!ff_mirror_match_fh(mirror, pos))
188 if (refcount_inc_not_zero(&pos->ref)) {
189 spin_unlock(&inode->i_lock);
193 list_add(&mirror->mirrors, &ff_layout->mirrors);
195 spin_unlock(&inode->i_lock);
200 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
203 if (mirror->layout == NULL)
205 inode = mirror->layout->plh_inode;
206 spin_lock(&inode->i_lock);
207 list_del(&mirror->mirrors);
208 spin_unlock(&inode->i_lock);
209 mirror->layout = NULL;
212 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
214 struct nfs4_ff_layout_mirror *mirror;
216 mirror = kzalloc(sizeof(*mirror), gfp_flags);
217 if (mirror != NULL) {
218 spin_lock_init(&mirror->lock);
219 refcount_set(&mirror->ref, 1);
220 INIT_LIST_HEAD(&mirror->mirrors);
225 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
227 const struct cred *cred;
229 ff_layout_remove_mirror(mirror);
230 kfree(mirror->fh_versions);
231 cred = rcu_access_pointer(mirror->ro_cred);
233 cred = rcu_access_pointer(mirror->rw_cred);
235 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
239 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
241 if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
242 ff_layout_free_mirror(mirror);
245 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
249 if (fls->mirror_array) {
250 for (i = 0; i < fls->mirror_array_cnt; i++) {
251 /* normally mirror_ds is freed in
252 * .free_deviceid_node but we still do it here
253 * for .alloc_lseg error path */
254 ff_layout_put_mirror(fls->mirror_array[i]);
256 kfree(fls->mirror_array);
257 fls->mirror_array = NULL;
261 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
265 dprintk("--> %s\n", __func__);
267 /* FIXME: remove this check when layout segment support is added */
268 if (lgr->range.offset != 0 ||
269 lgr->range.length != NFS4_MAX_UINT64) {
270 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
275 dprintk("--> %s returns %d\n", __func__, ret);
279 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
282 ff_layout_free_mirror_array(fls);
288 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
289 const struct pnfs_layout_range *l2)
293 if (l1->iomode != l2->iomode)
294 return l1->iomode != IOMODE_READ;
295 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
296 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
297 if (end1 < l2->offset)
299 if (end2 < l1->offset)
301 return l2->offset <= l1->offset;
305 ff_lseg_merge(struct pnfs_layout_segment *new,
306 struct pnfs_layout_segment *old)
308 u64 new_end, old_end;
310 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
312 if (new->pls_range.iomode != old->pls_range.iomode)
314 old_end = pnfs_calc_offset_end(old->pls_range.offset,
315 old->pls_range.length);
316 if (old_end < new->pls_range.offset)
318 new_end = pnfs_calc_offset_end(new->pls_range.offset,
319 new->pls_range.length);
320 if (new_end < old->pls_range.offset)
323 /* Mergeable: copy info from 'old' to 'new' */
324 if (new_end < old_end)
326 if (new->pls_range.offset < old->pls_range.offset)
327 new->pls_range.offset = old->pls_range.offset;
328 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
330 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
331 set_bit(NFS_LSEG_ROC, &new->pls_flags);
336 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
337 struct pnfs_layout_segment *lseg,
338 struct list_head *free_me)
340 pnfs_generic_layout_insert_lseg(lo, lseg,
341 ff_lseg_range_is_after,
346 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
350 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
351 for (j = i + 1; j < fls->mirror_array_cnt; j++)
352 if (fls->mirror_array[i]->efficiency <
353 fls->mirror_array[j]->efficiency)
354 swap(fls->mirror_array[i],
355 fls->mirror_array[j]);
359 static struct pnfs_layout_segment *
360 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
361 struct nfs4_layoutget_res *lgr,
364 struct pnfs_layout_segment *ret;
365 struct nfs4_ff_layout_segment *fls = NULL;
366 struct xdr_stream stream;
368 struct page *scratch;
370 u32 mirror_array_cnt;
374 dprintk("--> %s\n", __func__);
375 scratch = alloc_page(gfp_flags);
377 return ERR_PTR(-ENOMEM);
379 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
381 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
383 /* stripe unit and mirror_array_cnt */
385 p = xdr_inline_decode(&stream, 8 + 4);
389 p = xdr_decode_hyper(p, &stripe_unit);
390 mirror_array_cnt = be32_to_cpup(p++);
391 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
392 stripe_unit, mirror_array_cnt);
394 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
395 mirror_array_cnt == 0)
399 fls = kzalloc(sizeof(*fls), gfp_flags);
403 fls->mirror_array_cnt = mirror_array_cnt;
404 fls->stripe_unit = stripe_unit;
405 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
406 sizeof(fls->mirror_array[0]), gfp_flags);
407 if (fls->mirror_array == NULL)
410 for (i = 0; i < fls->mirror_array_cnt; i++) {
411 struct nfs4_ff_layout_mirror *mirror;
413 const struct cred __rcu *cred;
416 u32 ds_count, fh_count, id;
420 p = xdr_inline_decode(&stream, 4);
423 ds_count = be32_to_cpup(p);
425 /* FIXME: allow for striping? */
429 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
430 if (fls->mirror_array[i] == NULL) {
435 fls->mirror_array[i]->ds_count = ds_count;
438 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
444 p = xdr_inline_decode(&stream, 4);
447 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
450 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
456 p = xdr_inline_decode(&stream, 4);
459 fh_count = be32_to_cpup(p);
461 fls->mirror_array[i]->fh_versions =
462 kcalloc(fh_count, sizeof(struct nfs_fh),
464 if (fls->mirror_array[i]->fh_versions == NULL) {
469 for (j = 0; j < fh_count; j++) {
470 rc = decode_nfs_fh(&stream,
471 &fls->mirror_array[i]->fh_versions[j]);
476 fls->mirror_array[i]->fh_versions_cnt = fh_count;
479 rc = decode_name(&stream, &id);
483 uid = make_kuid(&init_user_ns, id);
486 rc = decode_name(&stream, &id);
490 gid = make_kgid(&init_user_ns, id);
492 if (gfp_flags & __GFP_FS)
493 kcred = prepare_kernel_cred(NULL);
495 unsigned int nofs_flags = memalloc_nofs_save();
496 kcred = prepare_kernel_cred(NULL);
497 memalloc_nofs_restore(nofs_flags);
504 cred = RCU_INITIALIZER(kcred);
506 if (lgr->range.iomode == IOMODE_READ)
507 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
509 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
511 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
512 if (mirror != fls->mirror_array[i]) {
513 /* swap cred ptrs so free_mirror will clean up old */
514 if (lgr->range.iomode == IOMODE_READ) {
515 cred = xchg(&mirror->ro_cred, cred);
516 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
518 cred = xchg(&mirror->rw_cred, cred);
519 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
521 ff_layout_free_mirror(fls->mirror_array[i]);
522 fls->mirror_array[i] = mirror;
525 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
526 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
527 from_kuid(&init_user_ns, uid),
528 from_kgid(&init_user_ns, gid));
531 p = xdr_inline_decode(&stream, 4);
533 goto out_sort_mirrors;
534 fls->flags = be32_to_cpup(p);
536 p = xdr_inline_decode(&stream, 4);
538 goto out_sort_mirrors;
539 for (i=0; i < fls->mirror_array_cnt; i++)
540 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
543 ff_layout_sort_mirrors(fls);
544 rc = ff_layout_check_layout(lgr);
547 ret = &fls->generic_hdr;
548 dprintk("<-- %s (success)\n", __func__);
550 __free_page(scratch);
553 _ff_layout_free_lseg(fls);
555 dprintk("<-- %s (%d)\n", __func__, rc);
559 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
561 struct pnfs_layout_segment *lseg;
563 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
564 if (lseg->pls_range.iomode == IOMODE_RW)
571 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
573 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
575 dprintk("--> %s\n", __func__);
577 if (lseg->pls_range.iomode == IOMODE_RW) {
578 struct nfs4_flexfile_layout *ffl;
581 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
582 inode = ffl->generic_hdr.plh_inode;
583 spin_lock(&inode->i_lock);
584 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
585 ffl->commit_info.nbuckets = 0;
586 kfree(ffl->commit_info.buckets);
587 ffl->commit_info.buckets = NULL;
589 spin_unlock(&inode->i_lock);
591 _ff_layout_free_lseg(fls);
594 /* Return 1 until we have multiple lsegs support */
596 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
602 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
604 /* first IO request? */
605 if (atomic_inc_return(&timer->n_ops) == 1) {
606 timer->start_time = now;
611 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
615 if (atomic_dec_return(&timer->n_ops) < 0)
618 start = timer->start_time;
619 timer->start_time = now;
620 return ktime_sub(now, start);
624 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
625 struct nfs4_ff_layoutstat *layoutstat,
628 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
629 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
631 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
632 if (!mirror->start_time)
633 mirror->start_time = now;
634 if (mirror->report_interval != 0)
635 report_interval = (s64)mirror->report_interval * 1000LL;
636 else if (layoutstats_timer != 0)
637 report_interval = (s64)layoutstats_timer * 1000LL;
638 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
640 ffl->last_report_time = now;
648 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
651 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
653 iostat->ops_requested++;
654 iostat->bytes_requested += requested;
658 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
661 ktime_t time_completed,
662 ktime_t time_started)
664 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
665 ktime_t completion_time = ktime_sub(time_completed, time_started);
668 iostat->ops_completed++;
669 iostat->bytes_completed += completed;
670 iostat->bytes_not_delivered += requested - completed;
672 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
673 iostat->total_busy_time =
674 ktime_add(iostat->total_busy_time, timer);
675 iostat->aggregate_completion_time =
676 ktime_add(iostat->aggregate_completion_time,
681 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
682 struct nfs4_ff_layout_mirror *mirror,
683 __u64 requested, ktime_t now)
687 spin_lock(&mirror->lock);
688 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
689 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
690 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
691 spin_unlock(&mirror->lock);
694 pnfs_report_layoutstat(inode, GFP_KERNEL);
698 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
699 struct nfs4_ff_layout_mirror *mirror,
703 spin_lock(&mirror->lock);
704 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
705 requested, completed,
706 ktime_get(), task->tk_start);
707 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
708 spin_unlock(&mirror->lock);
712 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
713 struct nfs4_ff_layout_mirror *mirror,
714 __u64 requested, ktime_t now)
718 spin_lock(&mirror->lock);
719 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
720 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
721 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
722 spin_unlock(&mirror->lock);
725 pnfs_report_layoutstat(inode, GFP_NOIO);
729 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
730 struct nfs4_ff_layout_mirror *mirror,
733 enum nfs3_stable_how committed)
735 if (committed == NFS_UNSTABLE)
736 requested = completed = 0;
738 spin_lock(&mirror->lock);
739 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
740 requested, completed, ktime_get(), task->tk_start);
741 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
742 spin_unlock(&mirror->lock);
746 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
747 struct nfs_commit_info *cinfo,
750 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
751 struct pnfs_commit_bucket *buckets;
754 if (cinfo->ds->nbuckets != 0) {
755 /* This assumes there is only one RW lseg per file.
756 * To support multiple lseg per file, we need to
757 * change struct pnfs_commit_bucket to allow dynamic
758 * increasing nbuckets.
763 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
765 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
772 spin_lock(&cinfo->inode->i_lock);
773 if (cinfo->ds->nbuckets != 0)
776 cinfo->ds->buckets = buckets;
777 cinfo->ds->nbuckets = size;
778 for (i = 0; i < size; i++) {
779 INIT_LIST_HEAD(&buckets[i].written);
780 INIT_LIST_HEAD(&buckets[i].committing);
781 /* mark direct verifier as unset */
782 buckets[i].direct_verf.committed =
783 NFS_INVALID_STABLE_HOW;
786 spin_unlock(&cinfo->inode->i_lock);
792 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx)
794 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
797 nfs4_mark_deviceid_unavailable(devid);
801 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx)
803 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
806 nfs4_mark_deviceid_available(devid);
809 static struct nfs4_pnfs_ds *
810 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
811 int start_idx, int *best_idx,
814 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
815 struct nfs4_ff_layout_mirror *mirror;
816 struct nfs4_pnfs_ds *ds;
817 bool fail_return = false;
820 /* mirrors are initially sorted by efficiency */
821 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
822 if (idx+1 == fls->mirror_array_cnt)
823 fail_return = !check_device;
825 mirror = FF_LAYOUT_COMP(lseg, idx);
826 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return);
831 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
841 static struct nfs4_pnfs_ds *
842 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
843 int start_idx, int *best_idx)
845 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
848 static struct nfs4_pnfs_ds *
849 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
850 int start_idx, int *best_idx)
852 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
855 static struct nfs4_pnfs_ds *
856 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
857 int start_idx, int *best_idx)
859 struct nfs4_pnfs_ds *ds;
861 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
864 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
868 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
869 struct nfs_page *req,
872 pnfs_put_lseg(pgio->pg_lseg);
873 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
880 if (IS_ERR(pgio->pg_lseg)) {
881 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
882 pgio->pg_lseg = NULL;
887 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
888 struct nfs_page *req)
890 struct nfs_pgio_mirror *pgm;
891 struct nfs4_ff_layout_mirror *mirror;
892 struct nfs4_pnfs_ds *ds;
896 pnfs_generic_pg_check_layout(pgio);
897 /* Use full layout for now */
898 if (!pgio->pg_lseg) {
899 ff_layout_pg_get_read(pgio, req, false);
903 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
904 ff_layout_pg_get_read(pgio, req, true);
909 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
911 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
913 pnfs_put_lseg(pgio->pg_lseg);
914 pgio->pg_lseg = NULL;
915 /* Sleep for 1 second before retrying */
920 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
922 pgio->pg_mirror_idx = ds_idx;
924 /* read always uses only one mirror - idx 0 for pgio layer */
925 pgm = &pgio->pg_mirrors[0];
926 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
930 if (pgio->pg_error < 0)
933 pnfs_put_lseg(pgio->pg_lseg);
934 pgio->pg_lseg = NULL;
935 nfs_pageio_reset_read_mds(pgio);
939 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
940 struct nfs_page *req)
942 struct nfs4_ff_layout_mirror *mirror;
943 struct nfs_pgio_mirror *pgm;
944 struct nfs_commit_info cinfo;
945 struct nfs4_pnfs_ds *ds;
950 pnfs_generic_pg_check_layout(pgio);
951 if (!pgio->pg_lseg) {
952 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
959 if (IS_ERR(pgio->pg_lseg)) {
960 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
961 pgio->pg_lseg = NULL;
965 /* If no lseg, fall back to write through mds */
966 if (pgio->pg_lseg == NULL)
969 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
970 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
974 /* Use a direct mapping of ds_idx to pgio mirror_idx */
975 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
976 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
979 for (i = 0; i < pgio->pg_mirror_count; i++) {
980 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
981 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
983 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
985 pnfs_put_lseg(pgio->pg_lseg);
986 pgio->pg_lseg = NULL;
987 /* Sleep for 1 second before retrying */
991 pgm = &pgio->pg_mirrors[i];
992 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
998 pnfs_put_lseg(pgio->pg_lseg);
999 pgio->pg_lseg = NULL;
1000 nfs_pageio_reset_write_mds(pgio);
1004 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
1005 struct nfs_page *req)
1007 if (!pgio->pg_lseg) {
1008 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1015 if (IS_ERR(pgio->pg_lseg)) {
1016 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1017 pgio->pg_lseg = NULL;
1022 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
1024 /* no lseg means that pnfs is not in use, so no mirroring here */
1025 nfs_pageio_reset_write_mds(pgio);
1030 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1031 .pg_init = ff_layout_pg_init_read,
1032 .pg_test = pnfs_generic_pg_test,
1033 .pg_doio = pnfs_generic_pg_readpages,
1034 .pg_cleanup = pnfs_generic_pg_cleanup,
1037 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1038 .pg_init = ff_layout_pg_init_write,
1039 .pg_test = pnfs_generic_pg_test,
1040 .pg_doio = pnfs_generic_pg_writepages,
1041 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1042 .pg_cleanup = pnfs_generic_pg_cleanup,
1045 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1047 struct rpc_task *task = &hdr->task;
1049 pnfs_layoutcommit_inode(hdr->inode, false);
1052 dprintk("%s Reset task %5u for i/o through pNFS "
1053 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1055 hdr->inode->i_sb->s_id,
1056 (unsigned long long)NFS_FILEID(hdr->inode),
1058 (unsigned long long)hdr->args.offset);
1060 hdr->completion_ops->reschedule_io(hdr);
1064 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1065 dprintk("%s Reset task %5u for i/o through MDS "
1066 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1068 hdr->inode->i_sb->s_id,
1069 (unsigned long long)NFS_FILEID(hdr->inode),
1071 (unsigned long long)hdr->args.offset);
1073 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1077 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1079 struct rpc_task *task = &hdr->task;
1081 pnfs_layoutcommit_inode(hdr->inode, false);
1083 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1084 dprintk("%s Reset task %5u for i/o through MDS "
1085 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1087 hdr->inode->i_sb->s_id,
1088 (unsigned long long)NFS_FILEID(hdr->inode),
1090 (unsigned long long)hdr->args.offset);
1092 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1096 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1097 struct nfs4_state *state,
1098 struct nfs_client *clp,
1099 struct pnfs_layout_segment *lseg,
1102 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1103 struct inode *inode = lo->plh_inode;
1104 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1105 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1107 switch (task->tk_status) {
1108 case -NFS4ERR_BADSESSION:
1109 case -NFS4ERR_BADSLOT:
1110 case -NFS4ERR_BAD_HIGH_SLOT:
1111 case -NFS4ERR_DEADSESSION:
1112 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1113 case -NFS4ERR_SEQ_FALSE_RETRY:
1114 case -NFS4ERR_SEQ_MISORDERED:
1115 dprintk("%s ERROR %d, Reset session. Exchangeid "
1116 "flags 0x%x\n", __func__, task->tk_status,
1117 clp->cl_exchange_flags);
1118 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1120 case -NFS4ERR_DELAY:
1121 case -NFS4ERR_GRACE:
1122 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1124 case -NFS4ERR_RETRY_UNCACHED_REP:
1127 return -NFS4ERR_RESET_TO_PNFS;
1128 /* Invalidate Layout errors */
1129 case -NFS4ERR_PNFS_NO_LAYOUT:
1130 case -ESTALE: /* mapped NFS4ERR_STALE */
1131 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1132 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1133 case -NFS4ERR_FHEXPIRED:
1134 case -NFS4ERR_WRONG_TYPE:
1135 dprintk("%s Invalid layout error %d\n", __func__,
1138 * Destroy layout so new i/o will get a new layout.
1139 * Layout will not be destroyed until all current lseg
1140 * references are put. Mark layout as invalid to resend failed
1141 * i/o and all i/o waiting on the slot table to the MDS until
1142 * layout is destroyed and a new valid layout is obtained.
1144 pnfs_destroy_layout(NFS_I(inode));
1145 rpc_wake_up(&tbl->slot_tbl_waitq);
1147 /* RPC connection errors */
1155 dprintk("%s DS connection error %d\n", __func__,
1157 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1159 rpc_wake_up(&tbl->slot_tbl_waitq);
1162 if (ff_layout_avoid_mds_available_ds(lseg))
1163 return -NFS4ERR_RESET_TO_PNFS;
1165 dprintk("%s Retry through MDS. Error %d\n", __func__,
1167 return -NFS4ERR_RESET_TO_MDS;
1169 task->tk_status = 0;
1173 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1174 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1175 struct pnfs_layout_segment *lseg,
1178 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1180 switch (task->tk_status) {
1181 /* File access problems. Don't mark the device as unavailable */
1191 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1194 dprintk("%s DS connection error %d\n", __func__,
1196 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1199 /* FIXME: Need to prevent infinite looping here. */
1200 return -NFS4ERR_RESET_TO_PNFS;
1202 task->tk_status = 0;
1203 rpc_restart_call_prepare(task);
1204 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1208 static int ff_layout_async_handle_error(struct rpc_task *task,
1209 struct nfs4_state *state,
1210 struct nfs_client *clp,
1211 struct pnfs_layout_segment *lseg,
1214 int vers = clp->cl_nfs_mod->rpc_vers->number;
1216 if (task->tk_status >= 0) {
1217 ff_layout_mark_ds_reachable(lseg, idx);
1221 /* Handle the case of an invalid layout segment */
1222 if (!pnfs_is_valid_lseg(lseg))
1223 return -NFS4ERR_RESET_TO_PNFS;
1227 return ff_layout_async_handle_error_v3(task, lseg, idx);
1229 return ff_layout_async_handle_error_v4(task, state, clp,
1232 /* should never happen */
1238 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1239 int idx, u64 offset, u64 length,
1240 u32 status, int opnum, int error)
1242 struct nfs4_ff_layout_mirror *mirror;
1249 case -EPROTONOSUPPORT:
1260 status = NFS4ERR_NXIO;
1263 status = NFS4ERR_ACCESS;
1278 mirror = FF_LAYOUT_COMP(lseg, idx);
1279 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1280 mirror, offset, length, status, opnum,
1282 if (status == NFS4ERR_NXIO)
1283 ff_layout_mark_ds_unreachable(lseg, idx);
1284 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1285 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1288 /* NFS_PROTO call done callback routines */
1289 static int ff_layout_read_done_cb(struct rpc_task *task,
1290 struct nfs_pgio_header *hdr)
1294 trace_nfs4_pnfs_read(hdr, task->tk_status);
1295 if (task->tk_status < 0)
1296 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1297 hdr->args.offset, hdr->args.count,
1298 hdr->res.op_status, OP_READ,
1300 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1301 hdr->ds_clp, hdr->lseg,
1302 hdr->pgio_mirror_idx);
1304 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1305 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1307 case -NFS4ERR_RESET_TO_PNFS:
1308 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1309 hdr->pgio_mirror_idx + 1,
1310 &hdr->pgio_mirror_idx))
1311 goto out_layouterror;
1312 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1313 return task->tk_status;
1314 case -NFS4ERR_RESET_TO_MDS:
1315 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1316 return task->tk_status;
1323 ff_layout_send_layouterror(hdr->lseg);
1325 rpc_restart_call_prepare(task);
1330 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1332 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1336 * We reference the rpc_cred of the first WRITE that triggers the need for
1337 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1338 * rfc5661 is not clear about which credential should be used.
1340 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1341 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1342 * we always send layoutcommit after DS writes.
1345 ff_layout_set_layoutcommit(struct inode *inode,
1346 struct pnfs_layout_segment *lseg,
1349 if (!ff_layout_need_layoutcommit(lseg))
1352 pnfs_set_layoutcommit(inode, lseg, end_offset);
1353 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1354 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1357 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1358 struct nfs_pgio_header *hdr)
1360 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1362 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1363 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1368 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1369 struct nfs_pgio_header *hdr)
1371 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1373 nfs4_ff_layout_stat_io_end_read(task,
1374 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1377 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1380 static int ff_layout_read_prepare_common(struct rpc_task *task,
1381 struct nfs_pgio_header *hdr)
1383 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1384 rpc_exit(task, -EIO);
1388 ff_layout_read_record_layoutstats_start(task, hdr);
1393 * Call ops for the async read/write cases
1394 * In the case of dense layouts, the offset needs to be reset to its
1397 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1399 struct nfs_pgio_header *hdr = data;
1401 if (ff_layout_read_prepare_common(task, hdr))
1404 rpc_call_start(task);
1407 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1409 struct nfs_pgio_header *hdr = data;
1411 if (nfs4_setup_sequence(hdr->ds_clp,
1412 &hdr->args.seq_args,
1417 ff_layout_read_prepare_common(task, hdr);
1421 ff_layout_io_prepare_transmit(struct rpc_task *task,
1424 struct nfs_pgio_header *hdr = data;
1426 if (!pnfs_is_valid_lseg(hdr->lseg))
1427 rpc_exit(task, -EAGAIN);
1430 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1432 struct nfs_pgio_header *hdr = data;
1434 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1436 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1437 task->tk_status == 0) {
1438 nfs4_sequence_done(task, &hdr->res.seq_res);
1442 /* Note this may cause RPC to be resent */
1443 hdr->mds_ops->rpc_call_done(task, hdr);
1446 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1448 struct nfs_pgio_header *hdr = data;
1450 ff_layout_read_record_layoutstats_done(task, hdr);
1451 rpc_count_iostats_metrics(task,
1452 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1455 static void ff_layout_read_release(void *data)
1457 struct nfs_pgio_header *hdr = data;
1459 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1460 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1461 ff_layout_send_layouterror(hdr->lseg);
1462 pnfs_read_resend_pnfs(hdr);
1463 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1464 ff_layout_reset_read(hdr);
1465 pnfs_generic_rw_release(data);
1469 static int ff_layout_write_done_cb(struct rpc_task *task,
1470 struct nfs_pgio_header *hdr)
1472 loff_t end_offs = 0;
1475 trace_nfs4_pnfs_write(hdr, task->tk_status);
1476 if (task->tk_status < 0)
1477 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1478 hdr->args.offset, hdr->args.count,
1479 hdr->res.op_status, OP_WRITE,
1481 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1482 hdr->ds_clp, hdr->lseg,
1483 hdr->pgio_mirror_idx);
1485 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1486 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1488 case -NFS4ERR_RESET_TO_PNFS:
1489 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1490 return task->tk_status;
1491 case -NFS4ERR_RESET_TO_MDS:
1492 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1493 return task->tk_status;
1498 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1499 hdr->res.verf->committed == NFS_DATA_SYNC)
1500 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1502 /* Note: if the write is unstable, don't set end_offs until commit */
1503 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1505 /* zero out fattr since we don't care DS attr at all */
1506 hdr->fattr.valid = 0;
1507 if (task->tk_status >= 0)
1508 nfs_writeback_update_inode(hdr);
1513 static int ff_layout_commit_done_cb(struct rpc_task *task,
1514 struct nfs_commit_data *data)
1518 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1519 if (task->tk_status < 0)
1520 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1521 data->args.offset, data->args.count,
1522 data->res.op_status, OP_COMMIT,
1524 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1525 data->lseg, data->ds_commit_index);
1528 case -NFS4ERR_RESET_TO_PNFS:
1529 pnfs_generic_prepare_to_resend_writes(data);
1531 case -NFS4ERR_RESET_TO_MDS:
1532 pnfs_generic_prepare_to_resend_writes(data);
1535 rpc_restart_call_prepare(task);
1539 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1544 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1545 struct nfs_pgio_header *hdr)
1547 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1549 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1550 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1555 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1556 struct nfs_pgio_header *hdr)
1558 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1560 nfs4_ff_layout_stat_io_end_write(task,
1561 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1562 hdr->args.count, hdr->res.count,
1563 hdr->res.verf->committed);
1564 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1567 static int ff_layout_write_prepare_common(struct rpc_task *task,
1568 struct nfs_pgio_header *hdr)
1570 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1571 rpc_exit(task, -EIO);
1575 ff_layout_write_record_layoutstats_start(task, hdr);
1579 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1581 struct nfs_pgio_header *hdr = data;
1583 if (ff_layout_write_prepare_common(task, hdr))
1586 rpc_call_start(task);
1589 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1591 struct nfs_pgio_header *hdr = data;
1593 if (nfs4_setup_sequence(hdr->ds_clp,
1594 &hdr->args.seq_args,
1599 ff_layout_write_prepare_common(task, hdr);
1602 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1604 struct nfs_pgio_header *hdr = data;
1606 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1607 task->tk_status == 0) {
1608 nfs4_sequence_done(task, &hdr->res.seq_res);
1612 /* Note this may cause RPC to be resent */
1613 hdr->mds_ops->rpc_call_done(task, hdr);
1616 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1618 struct nfs_pgio_header *hdr = data;
1620 ff_layout_write_record_layoutstats_done(task, hdr);
1621 rpc_count_iostats_metrics(task,
1622 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1625 static void ff_layout_write_release(void *data)
1627 struct nfs_pgio_header *hdr = data;
1629 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1630 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1631 ff_layout_send_layouterror(hdr->lseg);
1632 ff_layout_reset_write(hdr, true);
1633 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1634 ff_layout_reset_write(hdr, false);
1635 pnfs_generic_rw_release(data);
1638 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1639 struct nfs_commit_data *cdata)
1641 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1643 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1644 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1648 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1649 struct nfs_commit_data *cdata)
1651 struct nfs_page *req;
1654 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1657 if (task->tk_status == 0) {
1658 list_for_each_entry(req, &cdata->pages, wb_list)
1659 count += req->wb_bytes;
1661 nfs4_ff_layout_stat_io_end_write(task,
1662 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1663 count, count, NFS_FILE_SYNC);
1664 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1667 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1668 struct nfs_commit_data *cdata)
1670 ff_layout_commit_record_layoutstats_start(task, cdata);
1673 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1675 ff_layout_commit_prepare_common(task, data);
1676 rpc_call_start(task);
1679 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1681 struct nfs_commit_data *wdata = data;
1683 if (nfs4_setup_sequence(wdata->ds_clp,
1684 &wdata->args.seq_args,
1685 &wdata->res.seq_res,
1688 ff_layout_commit_prepare_common(task, data);
1691 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1693 pnfs_generic_write_commit_done(task, data);
1696 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1698 struct nfs_commit_data *cdata = data;
1700 ff_layout_commit_record_layoutstats_done(task, cdata);
1701 rpc_count_iostats_metrics(task,
1702 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1705 static void ff_layout_commit_release(void *data)
1707 struct nfs_commit_data *cdata = data;
1709 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1710 pnfs_generic_commit_release(data);
1713 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1714 .rpc_call_prepare = ff_layout_read_prepare_v3,
1715 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
1716 .rpc_call_done = ff_layout_read_call_done,
1717 .rpc_count_stats = ff_layout_read_count_stats,
1718 .rpc_release = ff_layout_read_release,
1721 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1722 .rpc_call_prepare = ff_layout_read_prepare_v4,
1723 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
1724 .rpc_call_done = ff_layout_read_call_done,
1725 .rpc_count_stats = ff_layout_read_count_stats,
1726 .rpc_release = ff_layout_read_release,
1729 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1730 .rpc_call_prepare = ff_layout_write_prepare_v3,
1731 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
1732 .rpc_call_done = ff_layout_write_call_done,
1733 .rpc_count_stats = ff_layout_write_count_stats,
1734 .rpc_release = ff_layout_write_release,
1737 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1738 .rpc_call_prepare = ff_layout_write_prepare_v4,
1739 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
1740 .rpc_call_done = ff_layout_write_call_done,
1741 .rpc_count_stats = ff_layout_write_count_stats,
1742 .rpc_release = ff_layout_write_release,
1745 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1746 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1747 .rpc_call_done = ff_layout_commit_done,
1748 .rpc_count_stats = ff_layout_commit_count_stats,
1749 .rpc_release = ff_layout_commit_release,
1752 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1753 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1754 .rpc_call_done = ff_layout_commit_done,
1755 .rpc_count_stats = ff_layout_commit_count_stats,
1756 .rpc_release = ff_layout_commit_release,
1759 static enum pnfs_try_status
1760 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1762 struct pnfs_layout_segment *lseg = hdr->lseg;
1763 struct nfs4_pnfs_ds *ds;
1764 struct rpc_clnt *ds_clnt;
1765 struct nfs4_ff_layout_mirror *mirror;
1766 const struct cred *ds_cred;
1767 loff_t offset = hdr->args.offset;
1768 u32 idx = hdr->pgio_mirror_idx;
1772 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1773 __func__, hdr->inode->i_ino,
1774 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1776 mirror = FF_LAYOUT_COMP(lseg, idx);
1777 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1781 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1783 if (IS_ERR(ds_clnt))
1786 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1790 vers = nfs4_ff_layout_ds_version(mirror);
1792 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1793 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1795 hdr->pgio_done_cb = ff_layout_read_done_cb;
1796 refcount_inc(&ds->ds_clp->cl_count);
1797 hdr->ds_clp = ds->ds_clp;
1798 fh = nfs4_ff_layout_select_ds_fh(mirror);
1802 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1805 * Note that if we ever decide to split across DSes,
1806 * then we may need to handle dense-like offsets.
1808 hdr->args.offset = offset;
1809 hdr->mds_offset = offset;
1811 /* Perform an asynchronous read to ds */
1812 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1813 vers == 3 ? &ff_layout_read_call_ops_v3 :
1814 &ff_layout_read_call_ops_v4,
1815 0, RPC_TASK_SOFTCONN);
1817 return PNFS_ATTEMPTED;
1820 if (ff_layout_avoid_mds_available_ds(lseg))
1821 return PNFS_TRY_AGAIN;
1822 return PNFS_NOT_ATTEMPTED;
1825 /* Perform async writes. */
1826 static enum pnfs_try_status
1827 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1829 struct pnfs_layout_segment *lseg = hdr->lseg;
1830 struct nfs4_pnfs_ds *ds;
1831 struct rpc_clnt *ds_clnt;
1832 struct nfs4_ff_layout_mirror *mirror;
1833 const struct cred *ds_cred;
1834 loff_t offset = hdr->args.offset;
1837 int idx = hdr->pgio_mirror_idx;
1839 mirror = FF_LAYOUT_COMP(lseg, idx);
1840 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1844 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1846 if (IS_ERR(ds_clnt))
1849 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1853 vers = nfs4_ff_layout_ds_version(mirror);
1855 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1856 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1857 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1860 hdr->pgio_done_cb = ff_layout_write_done_cb;
1861 refcount_inc(&ds->ds_clp->cl_count);
1862 hdr->ds_clp = ds->ds_clp;
1863 hdr->ds_commit_idx = idx;
1864 fh = nfs4_ff_layout_select_ds_fh(mirror);
1868 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1871 * Note that if we ever decide to split across DSes,
1872 * then we may need to handle dense-like offsets.
1874 hdr->args.offset = offset;
1876 /* Perform an asynchronous write */
1877 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1878 vers == 3 ? &ff_layout_write_call_ops_v3 :
1879 &ff_layout_write_call_ops_v4,
1880 sync, RPC_TASK_SOFTCONN);
1882 return PNFS_ATTEMPTED;
1885 if (ff_layout_avoid_mds_available_ds(lseg))
1886 return PNFS_TRY_AGAIN;
1887 return PNFS_NOT_ATTEMPTED;
1890 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1895 static struct nfs_fh *
1896 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1898 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1900 /* FIXME: Assume that there is only one NFS version available
1903 return &flseg->mirror_array[i]->fh_versions[0];
1906 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1908 struct pnfs_layout_segment *lseg = data->lseg;
1909 struct nfs4_pnfs_ds *ds;
1910 struct rpc_clnt *ds_clnt;
1911 struct nfs4_ff_layout_mirror *mirror;
1912 const struct cred *ds_cred;
1917 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1918 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1921 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1922 mirror = FF_LAYOUT_COMP(lseg, idx);
1923 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1927 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1929 if (IS_ERR(ds_clnt))
1932 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
1936 vers = nfs4_ff_layout_ds_version(mirror);
1938 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1939 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1941 data->commit_done_cb = ff_layout_commit_done_cb;
1942 data->cred = ds_cred;
1943 refcount_inc(&ds->ds_clp->cl_count);
1944 data->ds_clp = ds->ds_clp;
1945 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1949 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1950 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1951 &ff_layout_commit_call_ops_v4,
1952 how, RPC_TASK_SOFTCONN);
1956 pnfs_generic_prepare_to_resend_writes(data);
1957 pnfs_generic_commit_release(data);
1962 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1963 int how, struct nfs_commit_info *cinfo)
1965 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1966 ff_layout_initiate_commit);
1969 static struct pnfs_ds_commit_info *
1970 ff_layout_get_ds_info(struct inode *inode)
1972 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1977 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1981 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1983 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1987 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1988 const struct nfs4_layoutreturn_args *args,
1989 const struct nfs4_flexfile_layoutreturn_args *ff_args)
1993 start = xdr_reserve_space(xdr, 4);
1994 if (unlikely(!start))
1997 *start = cpu_to_be32(ff_args->num_errors);
1998 /* This assume we always return _ALL_ layouts */
1999 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2003 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2005 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
2009 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2010 const nfs4_stateid *stateid,
2011 const struct nfs42_layoutstat_devinfo *devinfo)
2015 p = xdr_reserve_space(xdr, 8 + 8);
2016 p = xdr_encode_hyper(p, devinfo->offset);
2017 p = xdr_encode_hyper(p, devinfo->length);
2018 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2019 p = xdr_reserve_space(xdr, 4*8);
2020 p = xdr_encode_hyper(p, devinfo->read_count);
2021 p = xdr_encode_hyper(p, devinfo->read_bytes);
2022 p = xdr_encode_hyper(p, devinfo->write_count);
2023 p = xdr_encode_hyper(p, devinfo->write_bytes);
2024 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2028 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2029 const nfs4_stateid *stateid,
2030 const struct nfs42_layoutstat_devinfo *devinfo)
2032 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2033 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2034 devinfo->ld_private.data);
2037 /* report nothing for now */
2038 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2039 const struct nfs4_layoutreturn_args *args,
2040 struct nfs4_flexfile_layoutreturn_args *ff_args)
2045 p = xdr_reserve_space(xdr, 4);
2046 *p = cpu_to_be32(ff_args->num_dev);
2047 for (i = 0; i < ff_args->num_dev; i++)
2048 ff_layout_encode_ff_iostat(xdr,
2049 &args->layout->plh_stateid,
2050 &ff_args->devinfo[i]);
2054 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2055 unsigned int num_entries)
2059 for (i = 0; i < num_entries; i++) {
2060 if (!devinfo[i].ld_private.ops)
2062 if (!devinfo[i].ld_private.ops->free)
2064 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2068 static struct nfs4_deviceid_node *
2069 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2070 struct pnfs_device *pdev, gfp_t gfp_flags)
2072 struct nfs4_ff_layout_ds *dsaddr;
2074 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2077 return &dsaddr->id_node;
2081 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2082 const void *voidargs,
2083 const struct nfs4_xdr_opaque_data *ff_opaque)
2085 const struct nfs4_layoutreturn_args *args = voidargs;
2086 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2087 struct xdr_buf tmp_buf = {
2090 .iov_base = page_address(ff_args->pages[0]),
2093 .buflen = PAGE_SIZE,
2095 struct xdr_stream tmp_xdr;
2098 dprintk("%s: Begin\n", __func__);
2100 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2102 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2103 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2105 start = xdr_reserve_space(xdr, 4);
2106 *start = cpu_to_be32(tmp_buf.len);
2107 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2109 dprintk("%s: Return\n", __func__);
2113 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2115 struct nfs4_flexfile_layoutreturn_args *ff_args;
2119 ff_args = args->data;
2122 ff_layout_free_ds_ioerr(&ff_args->errors);
2123 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2125 put_page(ff_args->pages[0]);
2129 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2130 .encode = ff_layout_encode_layoutreturn,
2131 .free = ff_layout_free_layoutreturn,
2135 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2137 struct nfs4_flexfile_layoutreturn_args *ff_args;
2138 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2140 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2143 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2144 if (!ff_args->pages[0])
2145 goto out_nomem_free;
2147 INIT_LIST_HEAD(&ff_args->errors);
2148 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2149 &args->range, &ff_args->errors,
2150 FF_LAYOUTRETURN_MAXERR);
2152 spin_lock(&args->inode->i_lock);
2153 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2154 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2155 spin_unlock(&args->inode->i_lock);
2157 args->ld_private->ops = &layoutreturn_ops;
2158 args->ld_private->data = ff_args;
2166 #ifdef CONFIG_NFS_V4_2
2168 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2170 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2171 struct nfs42_layout_error *errors;
2174 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2176 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2177 if (list_empty(&head))
2180 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX,
2181 sizeof(*errors), GFP_NOFS);
2182 if (errors != NULL) {
2183 const struct nfs4_ff_layout_ds_err *pos;
2186 list_for_each_entry(pos, &head, list) {
2187 errors[n].offset = pos->offset;
2188 errors[n].length = pos->length;
2189 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2190 errors[n].errors[0].dev_id = pos->deviceid;
2191 errors[n].errors[0].status = pos->status;
2192 errors[n].errors[0].opnum = pos->opnum;
2194 if (!list_is_last(&pos->list, &head) &&
2195 n < NFS42_LAYOUTERROR_MAX)
2197 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2203 ff_layout_free_ds_ioerr(&head);
2207 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2213 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2215 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2217 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2221 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2224 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2225 const struct in6_addr *addr = &sin6->sin6_addr;
2228 * RFC 4291, Section 2.2.2
2230 * Shorthanded ANY address
2232 if (ipv6_addr_any(addr))
2233 return snprintf(buf, buflen, "::");
2236 * RFC 4291, Section 2.2.2
2238 * Shorthanded loopback address
2240 if (ipv6_addr_loopback(addr))
2241 return snprintf(buf, buflen, "::1");
2244 * RFC 4291, Section 2.2.3
2246 * Special presentation address format for mapped v4
2249 if (ipv6_addr_v4mapped(addr))
2250 return snprintf(buf, buflen, "::ffff:%pI4",
2251 &addr->s6_addr32[3]);
2254 * RFC 4291, Section 2.2.1
2256 return snprintf(buf, buflen, "%pI6c", addr);
2259 /* Derived from rpc_sockaddr2uaddr */
2261 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2263 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2264 char portbuf[RPCBIND_MAXUADDRPLEN];
2265 char addrbuf[RPCBIND_MAXUADDRLEN];
2267 unsigned short port;
2271 switch (sap->sa_family) {
2273 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2275 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2280 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2282 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2287 /* we only support tcp and tcp6 */
2292 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2293 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2295 p = xdr_reserve_space(xdr, 4 + netid_len);
2296 xdr_encode_opaque(p, netid, netid_len);
2298 p = xdr_reserve_space(xdr, 4 + len);
2299 xdr_encode_opaque(p, addrbuf, len);
2303 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2306 struct timespec64 ts;
2309 p = xdr_reserve_space(xdr, 12);
2310 ts = ktime_to_timespec64(t);
2311 p = xdr_encode_hyper(p, ts.tv_sec);
2312 *p++ = cpu_to_be32(ts.tv_nsec);
2316 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2317 struct nfs4_ff_io_stat *stat)
2321 p = xdr_reserve_space(xdr, 5 * 8);
2322 p = xdr_encode_hyper(p, stat->ops_requested);
2323 p = xdr_encode_hyper(p, stat->bytes_requested);
2324 p = xdr_encode_hyper(p, stat->ops_completed);
2325 p = xdr_encode_hyper(p, stat->bytes_completed);
2326 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2327 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2328 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2332 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2333 const struct nfs42_layoutstat_devinfo *devinfo,
2334 struct nfs4_ff_layout_mirror *mirror)
2336 struct nfs4_pnfs_ds_addr *da;
2337 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2338 struct nfs_fh *fh = &mirror->fh_versions[0];
2341 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2342 dprintk("%s: DS %s: encoding address %s\n",
2343 __func__, ds->ds_remotestr, da->da_remotestr);
2345 ff_layout_encode_netaddr(xdr, da);
2347 p = xdr_reserve_space(xdr, 4 + fh->size);
2348 xdr_encode_opaque(p, fh->data, fh->size);
2349 /* ff_io_latency4 read */
2350 spin_lock(&mirror->lock);
2351 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2352 /* ff_io_latency4 write */
2353 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2354 spin_unlock(&mirror->lock);
2356 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2358 p = xdr_reserve_space(xdr, 4);
2359 *p = cpu_to_be32(false);
2363 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2364 const struct nfs4_xdr_opaque_data *opaque)
2366 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2367 struct nfs42_layoutstat_devinfo, ld_private);
2370 /* layoutupdate length */
2371 start = xdr_reserve_space(xdr, 4);
2372 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2374 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2378 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2380 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2382 ff_layout_put_mirror(mirror);
2385 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2386 .encode = ff_layout_encode_layoutstats,
2387 .free = ff_layout_free_layoutstats,
2391 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2392 struct nfs42_layoutstat_devinfo *devinfo,
2395 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2396 struct nfs4_ff_layout_mirror *mirror;
2397 struct nfs4_deviceid_node *dev;
2400 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2403 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2405 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2407 /* mirror refcount put in cleanup_layoutstats */
2408 if (!refcount_inc_not_zero(&mirror->ref))
2410 dev = &mirror->mirror_ds->id_node;
2411 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2412 devinfo->offset = 0;
2413 devinfo->length = NFS4_MAX_UINT64;
2414 spin_lock(&mirror->lock);
2415 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2416 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2417 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2418 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2419 spin_unlock(&mirror->lock);
2420 devinfo->layout_type = LAYOUT_FLEX_FILES;
2421 devinfo->ld_private.ops = &layoutstat_ops;
2422 devinfo->ld_private.data = mirror;
2431 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2433 struct nfs4_flexfile_layout *ff_layout;
2434 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2436 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2437 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2441 spin_lock(&args->inode->i_lock);
2442 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2443 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2444 &args->devinfo[0], dev_count);
2445 spin_unlock(&args->inode->i_lock);
2446 if (!args->num_dev) {
2447 kfree(args->devinfo);
2448 args->devinfo = NULL;
2456 ff_layout_set_layoutdriver(struct nfs_server *server,
2457 const struct nfs_fh *dummy)
2459 #if IS_ENABLED(CONFIG_NFS_V4_2)
2460 server->caps |= NFS_CAP_LAYOUTSTATS;
2465 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2466 .id = LAYOUT_FLEX_FILES,
2467 .name = "LAYOUT_FLEX_FILES",
2468 .owner = THIS_MODULE,
2469 .flags = PNFS_LAYOUTGET_ON_OPEN,
2470 .max_layoutget_response = 4096, /* 1 page or so... */
2471 .set_layoutdriver = ff_layout_set_layoutdriver,
2472 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2473 .free_layout_hdr = ff_layout_free_layout_hdr,
2474 .alloc_lseg = ff_layout_alloc_lseg,
2475 .free_lseg = ff_layout_free_lseg,
2476 .add_lseg = ff_layout_add_lseg,
2477 .pg_read_ops = &ff_layout_pg_read_ops,
2478 .pg_write_ops = &ff_layout_pg_write_ops,
2479 .get_ds_info = ff_layout_get_ds_info,
2480 .free_deviceid_node = ff_layout_free_deviceid_node,
2481 .mark_request_commit = pnfs_layout_mark_request_commit,
2482 .clear_request_commit = pnfs_generic_clear_request_commit,
2483 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2484 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2485 .commit_pagelist = ff_layout_commit_pagelist,
2486 .read_pagelist = ff_layout_read_pagelist,
2487 .write_pagelist = ff_layout_write_pagelist,
2488 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2489 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2490 .sync = pnfs_nfs_generic_sync,
2491 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2494 static int __init nfs4flexfilelayout_init(void)
2496 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2498 return pnfs_register_layoutdriver(&flexfilelayout_type);
2501 static void __exit nfs4flexfilelayout_exit(void)
2503 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2505 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2508 MODULE_ALIAS("nfs-layouttype4-4");
2510 MODULE_LICENSE("GPL");
2511 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2513 module_init(nfs4flexfilelayout_init);
2514 module_exit(nfs4flexfilelayout_exit);