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Merge tag 'kvm-x86-mmu-6.7' of https://github.com/kvm-x86/linux into HEAD
[thirdparty/kernel/stable.git] / fs / nfs / flexfilelayout / flexfilelayout.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Module for pnfs flexfile layout driver.
4 *
5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6 *
7 * Tao Peng <bergwolf@primarydata.com>
8 */
9
10 #include <linux/nfs_fs.h>
11 #include <linux/nfs_mount.h>
12 #include <linux/nfs_page.h>
13 #include <linux/module.h>
14 #include <linux/sched/mm.h>
15
16 #include <linux/sunrpc/metrics.h>
17
18 #include "flexfilelayout.h"
19 #include "../nfs4session.h"
20 #include "../nfs4idmap.h"
21 #include "../internal.h"
22 #include "../delegation.h"
23 #include "../nfs4trace.h"
24 #include "../iostat.h"
25 #include "../nfs.h"
26 #include "../nfs42.h"
27
28 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
29
30 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
31 #define FF_LAYOUTRETURN_MAXERR 20
32
33 enum nfs4_ff_op_type {
34 NFS4_FF_OP_LAYOUTSTATS,
35 NFS4_FF_OP_LAYOUTRETURN,
36 };
37
38 static unsigned short io_maxretrans;
39
40 static const struct pnfs_commit_ops ff_layout_commit_ops;
41 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
42 struct nfs_pgio_header *hdr);
43 static int
44 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
45 struct nfs42_layoutstat_devinfo *devinfo,
46 int dev_limit, enum nfs4_ff_op_type type);
47 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
48 const struct nfs42_layoutstat_devinfo *devinfo,
49 struct nfs4_ff_layout_mirror *mirror);
50
51 static struct pnfs_layout_hdr *
52 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
53 {
54 struct nfs4_flexfile_layout *ffl;
55
56 ffl = kzalloc(sizeof(*ffl), gfp_flags);
57 if (ffl) {
58 pnfs_init_ds_commit_info(&ffl->commit_info);
59 INIT_LIST_HEAD(&ffl->error_list);
60 INIT_LIST_HEAD(&ffl->mirrors);
61 ffl->last_report_time = ktime_get();
62 ffl->commit_info.ops = &ff_layout_commit_ops;
63 return &ffl->generic_hdr;
64 } else
65 return NULL;
66 }
67
68 static void
69 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
70 {
71 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
72 struct nfs4_ff_layout_ds_err *err, *n;
73
74 list_for_each_entry_safe(err, n, &ffl->error_list, list) {
75 list_del(&err->list);
76 kfree(err);
77 }
78 kfree_rcu(ffl, generic_hdr.plh_rcu);
79 }
80
81 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
82 {
83 __be32 *p;
84
85 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
86 if (unlikely(p == NULL))
87 return -ENOBUFS;
88 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
89 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
90 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
91 p[0], p[1], p[2], p[3]);
92 return 0;
93 }
94
95 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
96 {
97 __be32 *p;
98
99 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
100 if (unlikely(!p))
101 return -ENOBUFS;
102 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
103 nfs4_print_deviceid(devid);
104 return 0;
105 }
106
107 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
108 {
109 __be32 *p;
110
111 p = xdr_inline_decode(xdr, 4);
112 if (unlikely(!p))
113 return -ENOBUFS;
114 fh->size = be32_to_cpup(p++);
115 if (fh->size > NFS_MAXFHSIZE) {
116 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
117 fh->size);
118 return -EOVERFLOW;
119 }
120 /* fh.data */
121 p = xdr_inline_decode(xdr, fh->size);
122 if (unlikely(!p))
123 return -ENOBUFS;
124 memcpy(&fh->data, p, fh->size);
125 dprintk("%s: fh len %d\n", __func__, fh->size);
126
127 return 0;
128 }
129
130 /*
131 * Currently only stringified uids and gids are accepted.
132 * I.e., kerberos is not supported to the DSes, so no pricipals.
133 *
134 * That means that one common function will suffice, but when
135 * principals are added, this should be split to accomodate
136 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
137 */
138 static int
139 decode_name(struct xdr_stream *xdr, u32 *id)
140 {
141 __be32 *p;
142 int len;
143
144 /* opaque_length(4)*/
145 p = xdr_inline_decode(xdr, 4);
146 if (unlikely(!p))
147 return -ENOBUFS;
148 len = be32_to_cpup(p++);
149 if (len < 0)
150 return -EINVAL;
151
152 dprintk("%s: len %u\n", __func__, len);
153
154 /* opaque body */
155 p = xdr_inline_decode(xdr, len);
156 if (unlikely(!p))
157 return -ENOBUFS;
158
159 if (!nfs_map_string_to_numeric((char *)p, len, id))
160 return -EINVAL;
161
162 return 0;
163 }
164
165 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
166 const struct nfs4_ff_layout_mirror *m2)
167 {
168 int i, j;
169
170 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
171 return false;
172 for (i = 0; i < m1->fh_versions_cnt; i++) {
173 bool found_fh = false;
174 for (j = 0; j < m2->fh_versions_cnt; j++) {
175 if (nfs_compare_fh(&m1->fh_versions[i],
176 &m2->fh_versions[j]) == 0) {
177 found_fh = true;
178 break;
179 }
180 }
181 if (!found_fh)
182 return false;
183 }
184 return true;
185 }
186
187 static struct nfs4_ff_layout_mirror *
188 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
189 struct nfs4_ff_layout_mirror *mirror)
190 {
191 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
192 struct nfs4_ff_layout_mirror *pos;
193 struct inode *inode = lo->plh_inode;
194
195 spin_lock(&inode->i_lock);
196 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
197 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
198 continue;
199 if (!ff_mirror_match_fh(mirror, pos))
200 continue;
201 if (refcount_inc_not_zero(&pos->ref)) {
202 spin_unlock(&inode->i_lock);
203 return pos;
204 }
205 }
206 list_add(&mirror->mirrors, &ff_layout->mirrors);
207 mirror->layout = lo;
208 spin_unlock(&inode->i_lock);
209 return mirror;
210 }
211
212 static void
213 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
214 {
215 struct inode *inode;
216 if (mirror->layout == NULL)
217 return;
218 inode = mirror->layout->plh_inode;
219 spin_lock(&inode->i_lock);
220 list_del(&mirror->mirrors);
221 spin_unlock(&inode->i_lock);
222 mirror->layout = NULL;
223 }
224
225 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
226 {
227 struct nfs4_ff_layout_mirror *mirror;
228
229 mirror = kzalloc(sizeof(*mirror), gfp_flags);
230 if (mirror != NULL) {
231 spin_lock_init(&mirror->lock);
232 refcount_set(&mirror->ref, 1);
233 INIT_LIST_HEAD(&mirror->mirrors);
234 }
235 return mirror;
236 }
237
238 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
239 {
240 const struct cred *cred;
241
242 ff_layout_remove_mirror(mirror);
243 kfree(mirror->fh_versions);
244 cred = rcu_access_pointer(mirror->ro_cred);
245 put_cred(cred);
246 cred = rcu_access_pointer(mirror->rw_cred);
247 put_cred(cred);
248 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
249 kfree(mirror);
250 }
251
252 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
253 {
254 if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
255 ff_layout_free_mirror(mirror);
256 }
257
258 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
259 {
260 u32 i;
261
262 for (i = 0; i < fls->mirror_array_cnt; i++)
263 ff_layout_put_mirror(fls->mirror_array[i]);
264 }
265
266 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
267 {
268 if (fls) {
269 ff_layout_free_mirror_array(fls);
270 kfree(fls);
271 }
272 }
273
274 static bool
275 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
276 struct pnfs_layout_segment *l2)
277 {
278 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
279 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
280 u32 i;
281
282 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
283 return false;
284 for (i = 0; i < fl1->mirror_array_cnt; i++) {
285 if (fl1->mirror_array[i] != fl2->mirror_array[i])
286 return false;
287 }
288 return true;
289 }
290
291 static bool
292 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
293 const struct pnfs_layout_range *l2)
294 {
295 u64 end1, end2;
296
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)
302 return false;
303 if (end2 < l1->offset)
304 return true;
305 return l2->offset <= l1->offset;
306 }
307
308 static bool
309 ff_lseg_merge(struct pnfs_layout_segment *new,
310 struct pnfs_layout_segment *old)
311 {
312 u64 new_end, old_end;
313
314 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
315 return false;
316 if (new->pls_range.iomode != old->pls_range.iomode)
317 return false;
318 old_end = pnfs_calc_offset_end(old->pls_range.offset,
319 old->pls_range.length);
320 if (old_end < new->pls_range.offset)
321 return false;
322 new_end = pnfs_calc_offset_end(new->pls_range.offset,
323 new->pls_range.length);
324 if (new_end < old->pls_range.offset)
325 return false;
326 if (!ff_lseg_match_mirrors(new, old))
327 return false;
328
329 /* Mergeable: copy info from 'old' to 'new' */
330 if (new_end < old_end)
331 new_end = old_end;
332 if (new->pls_range.offset < old->pls_range.offset)
333 new->pls_range.offset = old->pls_range.offset;
334 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
335 new_end);
336 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
337 set_bit(NFS_LSEG_ROC, &new->pls_flags);
338 return true;
339 }
340
341 static void
342 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
343 struct pnfs_layout_segment *lseg,
344 struct list_head *free_me)
345 {
346 pnfs_generic_layout_insert_lseg(lo, lseg,
347 ff_lseg_range_is_after,
348 ff_lseg_merge,
349 free_me);
350 }
351
352 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
353 {
354 int i, j;
355
356 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
357 for (j = i + 1; j < fls->mirror_array_cnt; j++)
358 if (fls->mirror_array[i]->efficiency <
359 fls->mirror_array[j]->efficiency)
360 swap(fls->mirror_array[i],
361 fls->mirror_array[j]);
362 }
363 }
364
365 static struct pnfs_layout_segment *
366 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
367 struct nfs4_layoutget_res *lgr,
368 gfp_t gfp_flags)
369 {
370 struct pnfs_layout_segment *ret;
371 struct nfs4_ff_layout_segment *fls = NULL;
372 struct xdr_stream stream;
373 struct xdr_buf buf;
374 struct page *scratch;
375 u64 stripe_unit;
376 u32 mirror_array_cnt;
377 __be32 *p;
378 int i, rc;
379
380 dprintk("--> %s\n", __func__);
381 scratch = alloc_page(gfp_flags);
382 if (!scratch)
383 return ERR_PTR(-ENOMEM);
384
385 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
386 lgr->layoutp->len);
387 xdr_set_scratch_page(&stream, scratch);
388
389 /* stripe unit and mirror_array_cnt */
390 rc = -EIO;
391 p = xdr_inline_decode(&stream, 8 + 4);
392 if (!p)
393 goto out_err_free;
394
395 p = xdr_decode_hyper(p, &stripe_unit);
396 mirror_array_cnt = be32_to_cpup(p++);
397 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
398 stripe_unit, mirror_array_cnt);
399
400 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
401 mirror_array_cnt == 0)
402 goto out_err_free;
403
404 rc = -ENOMEM;
405 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt),
406 gfp_flags);
407 if (!fls)
408 goto out_err_free;
409
410 fls->mirror_array_cnt = mirror_array_cnt;
411 fls->stripe_unit = stripe_unit;
412
413 for (i = 0; i < fls->mirror_array_cnt; i++) {
414 struct nfs4_ff_layout_mirror *mirror;
415 struct cred *kcred;
416 const struct cred __rcu *cred;
417 kuid_t uid;
418 kgid_t gid;
419 u32 ds_count, fh_count, id;
420 int j;
421
422 rc = -EIO;
423 p = xdr_inline_decode(&stream, 4);
424 if (!p)
425 goto out_err_free;
426 ds_count = be32_to_cpup(p);
427
428 /* FIXME: allow for striping? */
429 if (ds_count != 1)
430 goto out_err_free;
431
432 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
433 if (fls->mirror_array[i] == NULL) {
434 rc = -ENOMEM;
435 goto out_err_free;
436 }
437
438 fls->mirror_array[i]->ds_count = ds_count;
439
440 /* deviceid */
441 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
442 if (rc)
443 goto out_err_free;
444
445 /* efficiency */
446 rc = -EIO;
447 p = xdr_inline_decode(&stream, 4);
448 if (!p)
449 goto out_err_free;
450 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
451
452 /* stateid */
453 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
454 if (rc)
455 goto out_err_free;
456
457 /* fh */
458 rc = -EIO;
459 p = xdr_inline_decode(&stream, 4);
460 if (!p)
461 goto out_err_free;
462 fh_count = be32_to_cpup(p);
463
464 fls->mirror_array[i]->fh_versions =
465 kcalloc(fh_count, sizeof(struct nfs_fh),
466 gfp_flags);
467 if (fls->mirror_array[i]->fh_versions == NULL) {
468 rc = -ENOMEM;
469 goto out_err_free;
470 }
471
472 for (j = 0; j < fh_count; j++) {
473 rc = decode_nfs_fh(&stream,
474 &fls->mirror_array[i]->fh_versions[j]);
475 if (rc)
476 goto out_err_free;
477 }
478
479 fls->mirror_array[i]->fh_versions_cnt = fh_count;
480
481 /* user */
482 rc = decode_name(&stream, &id);
483 if (rc)
484 goto out_err_free;
485
486 uid = make_kuid(&init_user_ns, id);
487
488 /* group */
489 rc = decode_name(&stream, &id);
490 if (rc)
491 goto out_err_free;
492
493 gid = make_kgid(&init_user_ns, id);
494
495 if (gfp_flags & __GFP_FS)
496 kcred = prepare_kernel_cred(&init_task);
497 else {
498 unsigned int nofs_flags = memalloc_nofs_save();
499 kcred = prepare_kernel_cred(&init_task);
500 memalloc_nofs_restore(nofs_flags);
501 }
502 rc = -ENOMEM;
503 if (!kcred)
504 goto out_err_free;
505 kcred->fsuid = uid;
506 kcred->fsgid = gid;
507 cred = RCU_INITIALIZER(kcred);
508
509 if (lgr->range.iomode == IOMODE_READ)
510 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
511 else
512 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
513
514 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
515 if (mirror != fls->mirror_array[i]) {
516 /* swap cred ptrs so free_mirror will clean up old */
517 if (lgr->range.iomode == IOMODE_READ) {
518 cred = xchg(&mirror->ro_cred, cred);
519 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
520 } else {
521 cred = xchg(&mirror->rw_cred, cred);
522 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
523 }
524 ff_layout_free_mirror(fls->mirror_array[i]);
525 fls->mirror_array[i] = mirror;
526 }
527
528 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
529 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
530 from_kuid(&init_user_ns, uid),
531 from_kgid(&init_user_ns, gid));
532 }
533
534 p = xdr_inline_decode(&stream, 4);
535 if (!p)
536 goto out_sort_mirrors;
537 fls->flags = be32_to_cpup(p);
538
539 p = xdr_inline_decode(&stream, 4);
540 if (!p)
541 goto out_sort_mirrors;
542 for (i=0; i < fls->mirror_array_cnt; i++)
543 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
544
545 out_sort_mirrors:
546 ff_layout_sort_mirrors(fls);
547 ret = &fls->generic_hdr;
548 dprintk("<-- %s (success)\n", __func__);
549 out_free_page:
550 __free_page(scratch);
551 return ret;
552 out_err_free:
553 _ff_layout_free_lseg(fls);
554 ret = ERR_PTR(rc);
555 dprintk("<-- %s (%d)\n", __func__, rc);
556 goto out_free_page;
557 }
558
559 static void
560 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
561 {
562 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
563
564 dprintk("--> %s\n", __func__);
565
566 if (lseg->pls_range.iomode == IOMODE_RW) {
567 struct nfs4_flexfile_layout *ffl;
568 struct inode *inode;
569
570 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
571 inode = ffl->generic_hdr.plh_inode;
572 spin_lock(&inode->i_lock);
573 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
574 spin_unlock(&inode->i_lock);
575 }
576 _ff_layout_free_lseg(fls);
577 }
578
579 static void
580 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
581 {
582 /* first IO request? */
583 if (atomic_inc_return(&timer->n_ops) == 1) {
584 timer->start_time = now;
585 }
586 }
587
588 static ktime_t
589 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
590 {
591 ktime_t start;
592
593 if (atomic_dec_return(&timer->n_ops) < 0)
594 WARN_ON_ONCE(1);
595
596 start = timer->start_time;
597 timer->start_time = now;
598 return ktime_sub(now, start);
599 }
600
601 static bool
602 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
603 struct nfs4_ff_layoutstat *layoutstat,
604 ktime_t now)
605 {
606 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
607 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
608
609 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
610 if (!mirror->start_time)
611 mirror->start_time = now;
612 if (mirror->report_interval != 0)
613 report_interval = (s64)mirror->report_interval * 1000LL;
614 else if (layoutstats_timer != 0)
615 report_interval = (s64)layoutstats_timer * 1000LL;
616 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
617 report_interval) {
618 ffl->last_report_time = now;
619 return true;
620 }
621
622 return false;
623 }
624
625 static void
626 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
627 __u64 requested)
628 {
629 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
630
631 iostat->ops_requested++;
632 iostat->bytes_requested += requested;
633 }
634
635 static void
636 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
637 __u64 requested,
638 __u64 completed,
639 ktime_t time_completed,
640 ktime_t time_started)
641 {
642 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
643 ktime_t completion_time = ktime_sub(time_completed, time_started);
644 ktime_t timer;
645
646 iostat->ops_completed++;
647 iostat->bytes_completed += completed;
648 iostat->bytes_not_delivered += requested - completed;
649
650 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
651 iostat->total_busy_time =
652 ktime_add(iostat->total_busy_time, timer);
653 iostat->aggregate_completion_time =
654 ktime_add(iostat->aggregate_completion_time,
655 completion_time);
656 }
657
658 static void
659 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
660 struct nfs4_ff_layout_mirror *mirror,
661 __u64 requested, ktime_t now)
662 {
663 bool report;
664
665 spin_lock(&mirror->lock);
666 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
667 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
668 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
669 spin_unlock(&mirror->lock);
670
671 if (report)
672 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
673 }
674
675 static void
676 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
677 struct nfs4_ff_layout_mirror *mirror,
678 __u64 requested,
679 __u64 completed)
680 {
681 spin_lock(&mirror->lock);
682 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
683 requested, completed,
684 ktime_get(), task->tk_start);
685 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
686 spin_unlock(&mirror->lock);
687 }
688
689 static void
690 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
691 struct nfs4_ff_layout_mirror *mirror,
692 __u64 requested, ktime_t now)
693 {
694 bool report;
695
696 spin_lock(&mirror->lock);
697 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
698 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
699 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
700 spin_unlock(&mirror->lock);
701
702 if (report)
703 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
704 }
705
706 static void
707 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
708 struct nfs4_ff_layout_mirror *mirror,
709 __u64 requested,
710 __u64 completed,
711 enum nfs3_stable_how committed)
712 {
713 if (committed == NFS_UNSTABLE)
714 requested = completed = 0;
715
716 spin_lock(&mirror->lock);
717 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
718 requested, completed, ktime_get(), task->tk_start);
719 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
720 spin_unlock(&mirror->lock);
721 }
722
723 static void
724 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx)
725 {
726 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
727
728 if (devid)
729 nfs4_mark_deviceid_unavailable(devid);
730 }
731
732 static void
733 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
734 {
735 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
736
737 if (devid)
738 nfs4_mark_deviceid_available(devid);
739 }
740
741 static struct nfs4_pnfs_ds *
742 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
743 u32 start_idx, u32 *best_idx,
744 bool check_device)
745 {
746 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
747 struct nfs4_ff_layout_mirror *mirror;
748 struct nfs4_pnfs_ds *ds;
749 u32 idx;
750
751 /* mirrors are initially sorted by efficiency */
752 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
753 mirror = FF_LAYOUT_COMP(lseg, idx);
754 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
755 if (!ds)
756 continue;
757
758 if (check_device &&
759 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
760 continue;
761
762 *best_idx = idx;
763 return ds;
764 }
765
766 return NULL;
767 }
768
769 static struct nfs4_pnfs_ds *
770 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
771 u32 start_idx, u32 *best_idx)
772 {
773 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
774 }
775
776 static struct nfs4_pnfs_ds *
777 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
778 u32 start_idx, u32 *best_idx)
779 {
780 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
781 }
782
783 static struct nfs4_pnfs_ds *
784 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
785 u32 start_idx, u32 *best_idx)
786 {
787 struct nfs4_pnfs_ds *ds;
788
789 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
790 if (ds)
791 return ds;
792 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
793 }
794
795 static struct nfs4_pnfs_ds *
796 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
797 u32 *best_idx)
798 {
799 struct pnfs_layout_segment *lseg = pgio->pg_lseg;
800 struct nfs4_pnfs_ds *ds;
801
802 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
803 best_idx);
804 if (ds || !pgio->pg_mirror_idx)
805 return ds;
806 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
807 }
808
809 static void
810 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
811 struct nfs_page *req,
812 bool strict_iomode)
813 {
814 pnfs_put_lseg(pgio->pg_lseg);
815 pgio->pg_lseg =
816 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
817 req_offset(req), req->wb_bytes, IOMODE_READ,
818 strict_iomode, nfs_io_gfp_mask());
819 if (IS_ERR(pgio->pg_lseg)) {
820 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
821 pgio->pg_lseg = NULL;
822 }
823 }
824
825 static void
826 ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
827 struct nfs_page *req)
828 {
829 pnfs_generic_pg_check_layout(pgio);
830 pnfs_generic_pg_check_range(pgio, req);
831 }
832
833 static void
834 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
835 struct nfs_page *req)
836 {
837 struct nfs_pgio_mirror *pgm;
838 struct nfs4_ff_layout_mirror *mirror;
839 struct nfs4_pnfs_ds *ds;
840 u32 ds_idx;
841
842 retry:
843 ff_layout_pg_check_layout(pgio, req);
844 /* Use full layout for now */
845 if (!pgio->pg_lseg) {
846 ff_layout_pg_get_read(pgio, req, false);
847 if (!pgio->pg_lseg)
848 goto out_nolseg;
849 }
850 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
851 ff_layout_pg_get_read(pgio, req, true);
852 if (!pgio->pg_lseg)
853 goto out_nolseg;
854 }
855
856 ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
857 if (!ds) {
858 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
859 goto out_mds;
860 pnfs_generic_pg_cleanup(pgio);
861 /* Sleep for 1 second before retrying */
862 ssleep(1);
863 goto retry;
864 }
865
866 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
867 pgm = &pgio->pg_mirrors[0];
868 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
869
870 pgio->pg_mirror_idx = ds_idx;
871
872 if (NFS_SERVER(pgio->pg_inode)->flags &
873 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
874 pgio->pg_maxretrans = io_maxretrans;
875 return;
876 out_nolseg:
877 if (pgio->pg_error < 0)
878 return;
879 out_mds:
880 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
881 0, NFS4_MAX_UINT64, IOMODE_READ,
882 NFS_I(pgio->pg_inode)->layout,
883 pgio->pg_lseg);
884 pgio->pg_maxretrans = 0;
885 nfs_pageio_reset_read_mds(pgio);
886 }
887
888 static void
889 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
890 struct nfs_page *req)
891 {
892 struct nfs4_ff_layout_mirror *mirror;
893 struct nfs_pgio_mirror *pgm;
894 struct nfs4_pnfs_ds *ds;
895 u32 i;
896
897 retry:
898 ff_layout_pg_check_layout(pgio, req);
899 if (!pgio->pg_lseg) {
900 pgio->pg_lseg =
901 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
902 req_offset(req), req->wb_bytes,
903 IOMODE_RW, false, nfs_io_gfp_mask());
904 if (IS_ERR(pgio->pg_lseg)) {
905 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
906 pgio->pg_lseg = NULL;
907 return;
908 }
909 }
910 /* If no lseg, fall back to write through mds */
911 if (pgio->pg_lseg == NULL)
912 goto out_mds;
913
914 /* Use a direct mapping of ds_idx to pgio mirror_idx */
915 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
916 goto out_eagain;
917
918 for (i = 0; i < pgio->pg_mirror_count; i++) {
919 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
920 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
921 if (!ds) {
922 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
923 goto out_mds;
924 pnfs_generic_pg_cleanup(pgio);
925 /* Sleep for 1 second before retrying */
926 ssleep(1);
927 goto retry;
928 }
929 pgm = &pgio->pg_mirrors[i];
930 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
931 }
932
933 if (NFS_SERVER(pgio->pg_inode)->flags &
934 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
935 pgio->pg_maxretrans = io_maxretrans;
936 return;
937 out_eagain:
938 pnfs_generic_pg_cleanup(pgio);
939 pgio->pg_error = -EAGAIN;
940 return;
941 out_mds:
942 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
943 0, NFS4_MAX_UINT64, IOMODE_RW,
944 NFS_I(pgio->pg_inode)->layout,
945 pgio->pg_lseg);
946 pgio->pg_maxretrans = 0;
947 nfs_pageio_reset_write_mds(pgio);
948 pgio->pg_error = -EAGAIN;
949 }
950
951 static unsigned int
952 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
953 struct nfs_page *req)
954 {
955 if (!pgio->pg_lseg) {
956 pgio->pg_lseg =
957 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
958 req_offset(req), req->wb_bytes,
959 IOMODE_RW, false, nfs_io_gfp_mask());
960 if (IS_ERR(pgio->pg_lseg)) {
961 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
962 pgio->pg_lseg = NULL;
963 goto out;
964 }
965 }
966 if (pgio->pg_lseg)
967 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
968
969 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
970 0, NFS4_MAX_UINT64, IOMODE_RW,
971 NFS_I(pgio->pg_inode)->layout,
972 pgio->pg_lseg);
973 /* no lseg means that pnfs is not in use, so no mirroring here */
974 nfs_pageio_reset_write_mds(pgio);
975 out:
976 return 1;
977 }
978
979 static u32
980 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
981 {
982 u32 old = desc->pg_mirror_idx;
983
984 desc->pg_mirror_idx = idx;
985 return old;
986 }
987
988 static struct nfs_pgio_mirror *
989 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
990 {
991 return &desc->pg_mirrors[idx];
992 }
993
994 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
995 .pg_init = ff_layout_pg_init_read,
996 .pg_test = pnfs_generic_pg_test,
997 .pg_doio = pnfs_generic_pg_readpages,
998 .pg_cleanup = pnfs_generic_pg_cleanup,
999 };
1000
1001 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1002 .pg_init = ff_layout_pg_init_write,
1003 .pg_test = pnfs_generic_pg_test,
1004 .pg_doio = pnfs_generic_pg_writepages,
1005 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1006 .pg_cleanup = pnfs_generic_pg_cleanup,
1007 .pg_get_mirror = ff_layout_pg_get_mirror_write,
1008 .pg_set_mirror = ff_layout_pg_set_mirror_write,
1009 };
1010
1011 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1012 {
1013 struct rpc_task *task = &hdr->task;
1014
1015 pnfs_layoutcommit_inode(hdr->inode, false);
1016
1017 if (retry_pnfs) {
1018 dprintk("%s Reset task %5u for i/o through pNFS "
1019 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1020 hdr->task.tk_pid,
1021 hdr->inode->i_sb->s_id,
1022 (unsigned long long)NFS_FILEID(hdr->inode),
1023 hdr->args.count,
1024 (unsigned long long)hdr->args.offset);
1025
1026 hdr->completion_ops->reschedule_io(hdr);
1027 return;
1028 }
1029
1030 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1031 dprintk("%s Reset task %5u for i/o through MDS "
1032 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1033 hdr->task.tk_pid,
1034 hdr->inode->i_sb->s_id,
1035 (unsigned long long)NFS_FILEID(hdr->inode),
1036 hdr->args.count,
1037 (unsigned long long)hdr->args.offset);
1038
1039 trace_pnfs_mds_fallback_write_done(hdr->inode,
1040 hdr->args.offset, hdr->args.count,
1041 IOMODE_RW, NFS_I(hdr->inode)->layout,
1042 hdr->lseg);
1043 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1044 }
1045 }
1046
1047 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1048 {
1049 u32 idx = hdr->pgio_mirror_idx + 1;
1050 u32 new_idx = 0;
1051
1052 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
1053 ff_layout_send_layouterror(hdr->lseg);
1054 else
1055 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1056 pnfs_read_resend_pnfs(hdr, new_idx);
1057 }
1058
1059 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1060 {
1061 struct rpc_task *task = &hdr->task;
1062
1063 pnfs_layoutcommit_inode(hdr->inode, false);
1064 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1065
1066 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1067 dprintk("%s Reset task %5u for i/o through MDS "
1068 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1069 hdr->task.tk_pid,
1070 hdr->inode->i_sb->s_id,
1071 (unsigned long long)NFS_FILEID(hdr->inode),
1072 hdr->args.count,
1073 (unsigned long long)hdr->args.offset);
1074
1075 trace_pnfs_mds_fallback_read_done(hdr->inode,
1076 hdr->args.offset, hdr->args.count,
1077 IOMODE_READ, NFS_I(hdr->inode)->layout,
1078 hdr->lseg);
1079 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1080 }
1081 }
1082
1083 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1084 struct nfs4_state *state,
1085 struct nfs_client *clp,
1086 struct pnfs_layout_segment *lseg,
1087 u32 idx)
1088 {
1089 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1090 struct inode *inode = lo->plh_inode;
1091 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1092 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1093
1094 switch (task->tk_status) {
1095 case -NFS4ERR_BADSESSION:
1096 case -NFS4ERR_BADSLOT:
1097 case -NFS4ERR_BAD_HIGH_SLOT:
1098 case -NFS4ERR_DEADSESSION:
1099 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1100 case -NFS4ERR_SEQ_FALSE_RETRY:
1101 case -NFS4ERR_SEQ_MISORDERED:
1102 dprintk("%s ERROR %d, Reset session. Exchangeid "
1103 "flags 0x%x\n", __func__, task->tk_status,
1104 clp->cl_exchange_flags);
1105 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1106 break;
1107 case -NFS4ERR_DELAY:
1108 case -NFS4ERR_GRACE:
1109 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1110 break;
1111 case -NFS4ERR_RETRY_UNCACHED_REP:
1112 break;
1113 /* Invalidate Layout errors */
1114 case -NFS4ERR_PNFS_NO_LAYOUT:
1115 case -ESTALE: /* mapped NFS4ERR_STALE */
1116 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1117 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1118 case -NFS4ERR_FHEXPIRED:
1119 case -NFS4ERR_WRONG_TYPE:
1120 dprintk("%s Invalid layout error %d\n", __func__,
1121 task->tk_status);
1122 /*
1123 * Destroy layout so new i/o will get a new layout.
1124 * Layout will not be destroyed until all current lseg
1125 * references are put. Mark layout as invalid to resend failed
1126 * i/o and all i/o waiting on the slot table to the MDS until
1127 * layout is destroyed and a new valid layout is obtained.
1128 */
1129 pnfs_destroy_layout(NFS_I(inode));
1130 rpc_wake_up(&tbl->slot_tbl_waitq);
1131 goto reset;
1132 /* RPC connection errors */
1133 case -ECONNREFUSED:
1134 case -EHOSTDOWN:
1135 case -EHOSTUNREACH:
1136 case -ENETUNREACH:
1137 case -EIO:
1138 case -ETIMEDOUT:
1139 case -EPIPE:
1140 case -EPROTO:
1141 case -ENODEV:
1142 dprintk("%s DS connection error %d\n", __func__,
1143 task->tk_status);
1144 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1145 &devid->deviceid);
1146 rpc_wake_up(&tbl->slot_tbl_waitq);
1147 fallthrough;
1148 default:
1149 if (ff_layout_avoid_mds_available_ds(lseg))
1150 return -NFS4ERR_RESET_TO_PNFS;
1151 reset:
1152 dprintk("%s Retry through MDS. Error %d\n", __func__,
1153 task->tk_status);
1154 return -NFS4ERR_RESET_TO_MDS;
1155 }
1156 task->tk_status = 0;
1157 return -EAGAIN;
1158 }
1159
1160 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1161 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1162 struct pnfs_layout_segment *lseg,
1163 u32 idx)
1164 {
1165 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1166
1167 switch (task->tk_status) {
1168 /* File access problems. Don't mark the device as unavailable */
1169 case -EACCES:
1170 case -ESTALE:
1171 case -EISDIR:
1172 case -EBADHANDLE:
1173 case -ELOOP:
1174 case -ENOSPC:
1175 break;
1176 case -EJUKEBOX:
1177 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1178 goto out_retry;
1179 default:
1180 dprintk("%s DS connection error %d\n", __func__,
1181 task->tk_status);
1182 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1183 &devid->deviceid);
1184 }
1185 /* FIXME: Need to prevent infinite looping here. */
1186 return -NFS4ERR_RESET_TO_PNFS;
1187 out_retry:
1188 task->tk_status = 0;
1189 rpc_restart_call_prepare(task);
1190 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1191 return -EAGAIN;
1192 }
1193
1194 static int ff_layout_async_handle_error(struct rpc_task *task,
1195 struct nfs4_state *state,
1196 struct nfs_client *clp,
1197 struct pnfs_layout_segment *lseg,
1198 u32 idx)
1199 {
1200 int vers = clp->cl_nfs_mod->rpc_vers->number;
1201
1202 if (task->tk_status >= 0) {
1203 ff_layout_mark_ds_reachable(lseg, idx);
1204 return 0;
1205 }
1206
1207 /* Handle the case of an invalid layout segment */
1208 if (!pnfs_is_valid_lseg(lseg))
1209 return -NFS4ERR_RESET_TO_PNFS;
1210
1211 switch (vers) {
1212 case 3:
1213 return ff_layout_async_handle_error_v3(task, lseg, idx);
1214 case 4:
1215 return ff_layout_async_handle_error_v4(task, state, clp,
1216 lseg, idx);
1217 default:
1218 /* should never happen */
1219 WARN_ON_ONCE(1);
1220 return 0;
1221 }
1222 }
1223
1224 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1225 u32 idx, u64 offset, u64 length,
1226 u32 *op_status, int opnum, int error)
1227 {
1228 struct nfs4_ff_layout_mirror *mirror;
1229 u32 status = *op_status;
1230 int err;
1231
1232 if (status == 0) {
1233 switch (error) {
1234 case -ETIMEDOUT:
1235 case -EPFNOSUPPORT:
1236 case -EPROTONOSUPPORT:
1237 case -EOPNOTSUPP:
1238 case -EINVAL:
1239 case -ECONNREFUSED:
1240 case -ECONNRESET:
1241 case -EHOSTDOWN:
1242 case -EHOSTUNREACH:
1243 case -ENETUNREACH:
1244 case -EADDRINUSE:
1245 case -ENOBUFS:
1246 case -EPIPE:
1247 case -EPERM:
1248 case -EPROTO:
1249 case -ENODEV:
1250 *op_status = status = NFS4ERR_NXIO;
1251 break;
1252 case -EACCES:
1253 *op_status = status = NFS4ERR_ACCESS;
1254 break;
1255 default:
1256 return;
1257 }
1258 }
1259
1260 mirror = FF_LAYOUT_COMP(lseg, idx);
1261 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1262 mirror, offset, length, status, opnum,
1263 nfs_io_gfp_mask());
1264
1265 switch (status) {
1266 case NFS4ERR_DELAY:
1267 case NFS4ERR_GRACE:
1268 break;
1269 case NFS4ERR_NXIO:
1270 ff_layout_mark_ds_unreachable(lseg, idx);
1271 /*
1272 * Don't return the layout if this is a read and we still
1273 * have layouts to try
1274 */
1275 if (opnum == OP_READ)
1276 break;
1277 fallthrough;
1278 default:
1279 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1280 lseg);
1281 }
1282
1283 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1284 }
1285
1286 /* NFS_PROTO call done callback routines */
1287 static int ff_layout_read_done_cb(struct rpc_task *task,
1288 struct nfs_pgio_header *hdr)
1289 {
1290 int err;
1291
1292 if (task->tk_status < 0) {
1293 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1294 hdr->args.offset, hdr->args.count,
1295 &hdr->res.op_status, OP_READ,
1296 task->tk_status);
1297 trace_ff_layout_read_error(hdr);
1298 }
1299
1300 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1301 hdr->ds_clp, hdr->lseg,
1302 hdr->pgio_mirror_idx);
1303
1304 trace_nfs4_pnfs_read(hdr, err);
1305 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1306 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1307 switch (err) {
1308 case -NFS4ERR_RESET_TO_PNFS:
1309 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1310 return task->tk_status;
1311 case -NFS4ERR_RESET_TO_MDS:
1312 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1313 return task->tk_status;
1314 case -EAGAIN:
1315 goto out_eagain;
1316 }
1317
1318 return 0;
1319 out_eagain:
1320 rpc_restart_call_prepare(task);
1321 return -EAGAIN;
1322 }
1323
1324 static bool
1325 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1326 {
1327 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1328 }
1329
1330 /*
1331 * We reference the rpc_cred of the first WRITE that triggers the need for
1332 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1333 * rfc5661 is not clear about which credential should be used.
1334 *
1335 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1336 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1337 * we always send layoutcommit after DS writes.
1338 */
1339 static void
1340 ff_layout_set_layoutcommit(struct inode *inode,
1341 struct pnfs_layout_segment *lseg,
1342 loff_t end_offset)
1343 {
1344 if (!ff_layout_need_layoutcommit(lseg))
1345 return;
1346
1347 pnfs_set_layoutcommit(inode, lseg, end_offset);
1348 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1349 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1350 }
1351
1352 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1353 struct nfs_pgio_header *hdr)
1354 {
1355 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1356 return;
1357 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1358 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1359 hdr->args.count,
1360 task->tk_start);
1361 }
1362
1363 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1364 struct nfs_pgio_header *hdr)
1365 {
1366 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1367 return;
1368 nfs4_ff_layout_stat_io_end_read(task,
1369 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1370 hdr->args.count,
1371 hdr->res.count);
1372 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1373 }
1374
1375 static int ff_layout_read_prepare_common(struct rpc_task *task,
1376 struct nfs_pgio_header *hdr)
1377 {
1378 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1379 rpc_exit(task, -EIO);
1380 return -EIO;
1381 }
1382
1383 if (!pnfs_is_valid_lseg(hdr->lseg)) {
1384 rpc_exit(task, -EAGAIN);
1385 return -EAGAIN;
1386 }
1387
1388 ff_layout_read_record_layoutstats_start(task, hdr);
1389 return 0;
1390 }
1391
1392 /*
1393 * Call ops for the async read/write cases
1394 * In the case of dense layouts, the offset needs to be reset to its
1395 * original value.
1396 */
1397 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1398 {
1399 struct nfs_pgio_header *hdr = data;
1400
1401 if (ff_layout_read_prepare_common(task, hdr))
1402 return;
1403
1404 rpc_call_start(task);
1405 }
1406
1407 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1408 {
1409 struct nfs_pgio_header *hdr = data;
1410
1411 if (nfs4_setup_sequence(hdr->ds_clp,
1412 &hdr->args.seq_args,
1413 &hdr->res.seq_res,
1414 task))
1415 return;
1416
1417 ff_layout_read_prepare_common(task, hdr);
1418 }
1419
1420 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1421 {
1422 struct nfs_pgio_header *hdr = data;
1423
1424 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1425 task->tk_status == 0) {
1426 nfs4_sequence_done(task, &hdr->res.seq_res);
1427 return;
1428 }
1429
1430 /* Note this may cause RPC to be resent */
1431 hdr->mds_ops->rpc_call_done(task, hdr);
1432 }
1433
1434 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1435 {
1436 struct nfs_pgio_header *hdr = data;
1437
1438 ff_layout_read_record_layoutstats_done(task, hdr);
1439 rpc_count_iostats_metrics(task,
1440 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1441 }
1442
1443 static void ff_layout_read_release(void *data)
1444 {
1445 struct nfs_pgio_header *hdr = data;
1446
1447 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1448 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1449 ff_layout_resend_pnfs_read(hdr);
1450 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1451 ff_layout_reset_read(hdr);
1452 pnfs_generic_rw_release(data);
1453 }
1454
1455
1456 static int ff_layout_write_done_cb(struct rpc_task *task,
1457 struct nfs_pgio_header *hdr)
1458 {
1459 loff_t end_offs = 0;
1460 int err;
1461
1462 if (task->tk_status < 0) {
1463 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1464 hdr->args.offset, hdr->args.count,
1465 &hdr->res.op_status, OP_WRITE,
1466 task->tk_status);
1467 trace_ff_layout_write_error(hdr);
1468 }
1469
1470 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1471 hdr->ds_clp, hdr->lseg,
1472 hdr->pgio_mirror_idx);
1473
1474 trace_nfs4_pnfs_write(hdr, err);
1475 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1476 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1477 switch (err) {
1478 case -NFS4ERR_RESET_TO_PNFS:
1479 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1480 return task->tk_status;
1481 case -NFS4ERR_RESET_TO_MDS:
1482 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1483 return task->tk_status;
1484 case -EAGAIN:
1485 return -EAGAIN;
1486 }
1487
1488 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1489 hdr->res.verf->committed == NFS_DATA_SYNC)
1490 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1491
1492 /* Note: if the write is unstable, don't set end_offs until commit */
1493 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1494
1495 /* zero out fattr since we don't care DS attr at all */
1496 hdr->fattr.valid = 0;
1497 if (task->tk_status >= 0)
1498 nfs_writeback_update_inode(hdr);
1499
1500 return 0;
1501 }
1502
1503 static int ff_layout_commit_done_cb(struct rpc_task *task,
1504 struct nfs_commit_data *data)
1505 {
1506 int err;
1507
1508 if (task->tk_status < 0) {
1509 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1510 data->args.offset, data->args.count,
1511 &data->res.op_status, OP_COMMIT,
1512 task->tk_status);
1513 trace_ff_layout_commit_error(data);
1514 }
1515
1516 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1517 data->lseg, data->ds_commit_index);
1518
1519 trace_nfs4_pnfs_commit_ds(data, err);
1520 switch (err) {
1521 case -NFS4ERR_RESET_TO_PNFS:
1522 pnfs_generic_prepare_to_resend_writes(data);
1523 return -EAGAIN;
1524 case -NFS4ERR_RESET_TO_MDS:
1525 pnfs_generic_prepare_to_resend_writes(data);
1526 return -EAGAIN;
1527 case -EAGAIN:
1528 rpc_restart_call_prepare(task);
1529 return -EAGAIN;
1530 }
1531
1532 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1533
1534 return 0;
1535 }
1536
1537 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1538 struct nfs_pgio_header *hdr)
1539 {
1540 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1541 return;
1542 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1543 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1544 hdr->args.count,
1545 task->tk_start);
1546 }
1547
1548 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1549 struct nfs_pgio_header *hdr)
1550 {
1551 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1552 return;
1553 nfs4_ff_layout_stat_io_end_write(task,
1554 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1555 hdr->args.count, hdr->res.count,
1556 hdr->res.verf->committed);
1557 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1558 }
1559
1560 static int ff_layout_write_prepare_common(struct rpc_task *task,
1561 struct nfs_pgio_header *hdr)
1562 {
1563 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1564 rpc_exit(task, -EIO);
1565 return -EIO;
1566 }
1567
1568 if (!pnfs_is_valid_lseg(hdr->lseg)) {
1569 rpc_exit(task, -EAGAIN);
1570 return -EAGAIN;
1571 }
1572
1573 ff_layout_write_record_layoutstats_start(task, hdr);
1574 return 0;
1575 }
1576
1577 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1578 {
1579 struct nfs_pgio_header *hdr = data;
1580
1581 if (ff_layout_write_prepare_common(task, hdr))
1582 return;
1583
1584 rpc_call_start(task);
1585 }
1586
1587 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1588 {
1589 struct nfs_pgio_header *hdr = data;
1590
1591 if (nfs4_setup_sequence(hdr->ds_clp,
1592 &hdr->args.seq_args,
1593 &hdr->res.seq_res,
1594 task))
1595 return;
1596
1597 ff_layout_write_prepare_common(task, hdr);
1598 }
1599
1600 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1601 {
1602 struct nfs_pgio_header *hdr = data;
1603
1604 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1605 task->tk_status == 0) {
1606 nfs4_sequence_done(task, &hdr->res.seq_res);
1607 return;
1608 }
1609
1610 /* Note this may cause RPC to be resent */
1611 hdr->mds_ops->rpc_call_done(task, hdr);
1612 }
1613
1614 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1615 {
1616 struct nfs_pgio_header *hdr = data;
1617
1618 ff_layout_write_record_layoutstats_done(task, hdr);
1619 rpc_count_iostats_metrics(task,
1620 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1621 }
1622
1623 static void ff_layout_write_release(void *data)
1624 {
1625 struct nfs_pgio_header *hdr = data;
1626
1627 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1628 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1629 ff_layout_send_layouterror(hdr->lseg);
1630 ff_layout_reset_write(hdr, true);
1631 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1632 ff_layout_reset_write(hdr, false);
1633 pnfs_generic_rw_release(data);
1634 }
1635
1636 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1637 struct nfs_commit_data *cdata)
1638 {
1639 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1640 return;
1641 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1642 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1643 0, task->tk_start);
1644 }
1645
1646 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1647 struct nfs_commit_data *cdata)
1648 {
1649 struct nfs_page *req;
1650 __u64 count = 0;
1651
1652 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1653 return;
1654
1655 if (task->tk_status == 0) {
1656 list_for_each_entry(req, &cdata->pages, wb_list)
1657 count += req->wb_bytes;
1658 }
1659 nfs4_ff_layout_stat_io_end_write(task,
1660 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1661 count, count, NFS_FILE_SYNC);
1662 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1663 }
1664
1665 static int ff_layout_commit_prepare_common(struct rpc_task *task,
1666 struct nfs_commit_data *cdata)
1667 {
1668 if (!pnfs_is_valid_lseg(cdata->lseg)) {
1669 rpc_exit(task, -EAGAIN);
1670 return -EAGAIN;
1671 }
1672
1673 ff_layout_commit_record_layoutstats_start(task, cdata);
1674 return 0;
1675 }
1676
1677 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1678 {
1679 if (ff_layout_commit_prepare_common(task, data))
1680 return;
1681
1682 rpc_call_start(task);
1683 }
1684
1685 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1686 {
1687 struct nfs_commit_data *wdata = data;
1688
1689 if (nfs4_setup_sequence(wdata->ds_clp,
1690 &wdata->args.seq_args,
1691 &wdata->res.seq_res,
1692 task))
1693 return;
1694 ff_layout_commit_prepare_common(task, data);
1695 }
1696
1697 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1698 {
1699 pnfs_generic_write_commit_done(task, data);
1700 }
1701
1702 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1703 {
1704 struct nfs_commit_data *cdata = data;
1705
1706 ff_layout_commit_record_layoutstats_done(task, cdata);
1707 rpc_count_iostats_metrics(task,
1708 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1709 }
1710
1711 static void ff_layout_commit_release(void *data)
1712 {
1713 struct nfs_commit_data *cdata = data;
1714
1715 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1716 pnfs_generic_commit_release(data);
1717 }
1718
1719 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1720 .rpc_call_prepare = ff_layout_read_prepare_v3,
1721 .rpc_call_done = ff_layout_read_call_done,
1722 .rpc_count_stats = ff_layout_read_count_stats,
1723 .rpc_release = ff_layout_read_release,
1724 };
1725
1726 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1727 .rpc_call_prepare = ff_layout_read_prepare_v4,
1728 .rpc_call_done = ff_layout_read_call_done,
1729 .rpc_count_stats = ff_layout_read_count_stats,
1730 .rpc_release = ff_layout_read_release,
1731 };
1732
1733 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1734 .rpc_call_prepare = ff_layout_write_prepare_v3,
1735 .rpc_call_done = ff_layout_write_call_done,
1736 .rpc_count_stats = ff_layout_write_count_stats,
1737 .rpc_release = ff_layout_write_release,
1738 };
1739
1740 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1741 .rpc_call_prepare = ff_layout_write_prepare_v4,
1742 .rpc_call_done = ff_layout_write_call_done,
1743 .rpc_count_stats = ff_layout_write_count_stats,
1744 .rpc_release = ff_layout_write_release,
1745 };
1746
1747 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1748 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1749 .rpc_call_done = ff_layout_commit_done,
1750 .rpc_count_stats = ff_layout_commit_count_stats,
1751 .rpc_release = ff_layout_commit_release,
1752 };
1753
1754 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1755 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1756 .rpc_call_done = ff_layout_commit_done,
1757 .rpc_count_stats = ff_layout_commit_count_stats,
1758 .rpc_release = ff_layout_commit_release,
1759 };
1760
1761 static enum pnfs_try_status
1762 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1763 {
1764 struct pnfs_layout_segment *lseg = hdr->lseg;
1765 struct nfs4_pnfs_ds *ds;
1766 struct rpc_clnt *ds_clnt;
1767 struct nfs4_ff_layout_mirror *mirror;
1768 const struct cred *ds_cred;
1769 loff_t offset = hdr->args.offset;
1770 u32 idx = hdr->pgio_mirror_idx;
1771 int vers;
1772 struct nfs_fh *fh;
1773
1774 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1775 __func__, hdr->inode->i_ino,
1776 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1777
1778 mirror = FF_LAYOUT_COMP(lseg, idx);
1779 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1780 if (!ds)
1781 goto out_failed;
1782
1783 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1784 hdr->inode);
1785 if (IS_ERR(ds_clnt))
1786 goto out_failed;
1787
1788 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1789 if (!ds_cred)
1790 goto out_failed;
1791
1792 vers = nfs4_ff_layout_ds_version(mirror);
1793
1794 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1795 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1796
1797 hdr->pgio_done_cb = ff_layout_read_done_cb;
1798 refcount_inc(&ds->ds_clp->cl_count);
1799 hdr->ds_clp = ds->ds_clp;
1800 fh = nfs4_ff_layout_select_ds_fh(mirror);
1801 if (fh)
1802 hdr->args.fh = fh;
1803
1804 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1805
1806 /*
1807 * Note that if we ever decide to split across DSes,
1808 * then we may need to handle dense-like offsets.
1809 */
1810 hdr->args.offset = offset;
1811 hdr->mds_offset = offset;
1812
1813 /* Perform an asynchronous read to ds */
1814 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1815 vers == 3 ? &ff_layout_read_call_ops_v3 :
1816 &ff_layout_read_call_ops_v4,
1817 0, RPC_TASK_SOFTCONN);
1818 put_cred(ds_cred);
1819 return PNFS_ATTEMPTED;
1820
1821 out_failed:
1822 if (ff_layout_avoid_mds_available_ds(lseg))
1823 return PNFS_TRY_AGAIN;
1824 trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1825 hdr->args.offset, hdr->args.count,
1826 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
1827 return PNFS_NOT_ATTEMPTED;
1828 }
1829
1830 /* Perform async writes. */
1831 static enum pnfs_try_status
1832 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1833 {
1834 struct pnfs_layout_segment *lseg = hdr->lseg;
1835 struct nfs4_pnfs_ds *ds;
1836 struct rpc_clnt *ds_clnt;
1837 struct nfs4_ff_layout_mirror *mirror;
1838 const struct cred *ds_cred;
1839 loff_t offset = hdr->args.offset;
1840 int vers;
1841 struct nfs_fh *fh;
1842 u32 idx = hdr->pgio_mirror_idx;
1843
1844 mirror = FF_LAYOUT_COMP(lseg, idx);
1845 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1846 if (!ds)
1847 goto out_failed;
1848
1849 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1850 hdr->inode);
1851 if (IS_ERR(ds_clnt))
1852 goto out_failed;
1853
1854 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1855 if (!ds_cred)
1856 goto out_failed;
1857
1858 vers = nfs4_ff_layout_ds_version(mirror);
1859
1860 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1861 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1862 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1863 vers);
1864
1865 hdr->pgio_done_cb = ff_layout_write_done_cb;
1866 refcount_inc(&ds->ds_clp->cl_count);
1867 hdr->ds_clp = ds->ds_clp;
1868 hdr->ds_commit_idx = idx;
1869 fh = nfs4_ff_layout_select_ds_fh(mirror);
1870 if (fh)
1871 hdr->args.fh = fh;
1872
1873 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1874
1875 /*
1876 * Note that if we ever decide to split across DSes,
1877 * then we may need to handle dense-like offsets.
1878 */
1879 hdr->args.offset = offset;
1880
1881 /* Perform an asynchronous write */
1882 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1883 vers == 3 ? &ff_layout_write_call_ops_v3 :
1884 &ff_layout_write_call_ops_v4,
1885 sync, RPC_TASK_SOFTCONN);
1886 put_cred(ds_cred);
1887 return PNFS_ATTEMPTED;
1888
1889 out_failed:
1890 if (ff_layout_avoid_mds_available_ds(lseg))
1891 return PNFS_TRY_AGAIN;
1892 trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1893 hdr->args.offset, hdr->args.count,
1894 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
1895 return PNFS_NOT_ATTEMPTED;
1896 }
1897
1898 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1899 {
1900 return i;
1901 }
1902
1903 static struct nfs_fh *
1904 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1905 {
1906 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1907
1908 /* FIXME: Assume that there is only one NFS version available
1909 * for the DS.
1910 */
1911 return &flseg->mirror_array[i]->fh_versions[0];
1912 }
1913
1914 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1915 {
1916 struct pnfs_layout_segment *lseg = data->lseg;
1917 struct nfs4_pnfs_ds *ds;
1918 struct rpc_clnt *ds_clnt;
1919 struct nfs4_ff_layout_mirror *mirror;
1920 const struct cred *ds_cred;
1921 u32 idx;
1922 int vers, ret;
1923 struct nfs_fh *fh;
1924
1925 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1926 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1927 goto out_err;
1928
1929 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1930 mirror = FF_LAYOUT_COMP(lseg, idx);
1931 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1932 if (!ds)
1933 goto out_err;
1934
1935 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1936 data->inode);
1937 if (IS_ERR(ds_clnt))
1938 goto out_err;
1939
1940 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
1941 if (!ds_cred)
1942 goto out_err;
1943
1944 vers = nfs4_ff_layout_ds_version(mirror);
1945
1946 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1947 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1948 vers);
1949 data->commit_done_cb = ff_layout_commit_done_cb;
1950 data->cred = ds_cred;
1951 refcount_inc(&ds->ds_clp->cl_count);
1952 data->ds_clp = ds->ds_clp;
1953 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1954 if (fh)
1955 data->args.fh = fh;
1956
1957 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1958 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1959 &ff_layout_commit_call_ops_v4,
1960 how, RPC_TASK_SOFTCONN);
1961 put_cred(ds_cred);
1962 return ret;
1963 out_err:
1964 pnfs_generic_prepare_to_resend_writes(data);
1965 pnfs_generic_commit_release(data);
1966 return -EAGAIN;
1967 }
1968
1969 static int
1970 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1971 int how, struct nfs_commit_info *cinfo)
1972 {
1973 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1974 ff_layout_initiate_commit);
1975 }
1976
1977 static bool ff_layout_match_rw(const struct rpc_task *task,
1978 const struct nfs_pgio_header *hdr,
1979 const struct pnfs_layout_segment *lseg)
1980 {
1981 return hdr->lseg == lseg;
1982 }
1983
1984 static bool ff_layout_match_commit(const struct rpc_task *task,
1985 const struct nfs_commit_data *cdata,
1986 const struct pnfs_layout_segment *lseg)
1987 {
1988 return cdata->lseg == lseg;
1989 }
1990
1991 static bool ff_layout_match_io(const struct rpc_task *task, const void *data)
1992 {
1993 const struct rpc_call_ops *ops = task->tk_ops;
1994
1995 if (ops == &ff_layout_read_call_ops_v3 ||
1996 ops == &ff_layout_read_call_ops_v4 ||
1997 ops == &ff_layout_write_call_ops_v3 ||
1998 ops == &ff_layout_write_call_ops_v4)
1999 return ff_layout_match_rw(task, task->tk_calldata, data);
2000 if (ops == &ff_layout_commit_call_ops_v3 ||
2001 ops == &ff_layout_commit_call_ops_v4)
2002 return ff_layout_match_commit(task, task->tk_calldata, data);
2003 return false;
2004 }
2005
2006 static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg)
2007 {
2008 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2009 struct nfs4_ff_layout_mirror *mirror;
2010 struct nfs4_ff_layout_ds *mirror_ds;
2011 struct nfs4_pnfs_ds *ds;
2012 struct nfs_client *ds_clp;
2013 struct rpc_clnt *clnt;
2014 u32 idx;
2015
2016 for (idx = 0; idx < flseg->mirror_array_cnt; idx++) {
2017 mirror = flseg->mirror_array[idx];
2018 mirror_ds = mirror->mirror_ds;
2019 if (!mirror_ds)
2020 continue;
2021 ds = mirror->mirror_ds->ds;
2022 if (!ds)
2023 continue;
2024 ds_clp = ds->ds_clp;
2025 if (!ds_clp)
2026 continue;
2027 clnt = ds_clp->cl_rpcclient;
2028 if (!clnt)
2029 continue;
2030 if (!rpc_cancel_tasks(clnt, -EAGAIN, ff_layout_match_io, lseg))
2031 continue;
2032 rpc_clnt_disconnect(clnt);
2033 }
2034 }
2035
2036 static struct pnfs_ds_commit_info *
2037 ff_layout_get_ds_info(struct inode *inode)
2038 {
2039 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
2040
2041 if (layout == NULL)
2042 return NULL;
2043
2044 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
2045 }
2046
2047 static void
2048 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2049 struct pnfs_layout_segment *lseg)
2050 {
2051 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2052 struct inode *inode = lseg->pls_layout->plh_inode;
2053 struct pnfs_commit_array *array, *new;
2054
2055 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt,
2056 nfs_io_gfp_mask());
2057 if (new) {
2058 spin_lock(&inode->i_lock);
2059 array = pnfs_add_commit_array(fl_cinfo, new, lseg);
2060 spin_unlock(&inode->i_lock);
2061 if (array != new)
2062 pnfs_free_commit_array(new);
2063 }
2064 }
2065
2066 static void
2067 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2068 struct inode *inode)
2069 {
2070 spin_lock(&inode->i_lock);
2071 pnfs_generic_ds_cinfo_destroy(fl_cinfo);
2072 spin_unlock(&inode->i_lock);
2073 }
2074
2075 static void
2076 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
2077 {
2078 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
2079 id_node));
2080 }
2081
2082 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
2083 const struct nfs4_layoutreturn_args *args,
2084 const struct nfs4_flexfile_layoutreturn_args *ff_args)
2085 {
2086 __be32 *start;
2087
2088 start = xdr_reserve_space(xdr, 4);
2089 if (unlikely(!start))
2090 return -E2BIG;
2091
2092 *start = cpu_to_be32(ff_args->num_errors);
2093 /* This assume we always return _ALL_ layouts */
2094 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2095 }
2096
2097 static void
2098 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2099 {
2100 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
2101 }
2102
2103 static void
2104 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2105 const nfs4_stateid *stateid,
2106 const struct nfs42_layoutstat_devinfo *devinfo)
2107 {
2108 __be32 *p;
2109
2110 p = xdr_reserve_space(xdr, 8 + 8);
2111 p = xdr_encode_hyper(p, devinfo->offset);
2112 p = xdr_encode_hyper(p, devinfo->length);
2113 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2114 p = xdr_reserve_space(xdr, 4*8);
2115 p = xdr_encode_hyper(p, devinfo->read_count);
2116 p = xdr_encode_hyper(p, devinfo->read_bytes);
2117 p = xdr_encode_hyper(p, devinfo->write_count);
2118 p = xdr_encode_hyper(p, devinfo->write_bytes);
2119 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2120 }
2121
2122 static void
2123 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2124 const nfs4_stateid *stateid,
2125 const struct nfs42_layoutstat_devinfo *devinfo)
2126 {
2127 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2128 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2129 devinfo->ld_private.data);
2130 }
2131
2132 /* report nothing for now */
2133 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2134 const struct nfs4_layoutreturn_args *args,
2135 struct nfs4_flexfile_layoutreturn_args *ff_args)
2136 {
2137 __be32 *p;
2138 int i;
2139
2140 p = xdr_reserve_space(xdr, 4);
2141 *p = cpu_to_be32(ff_args->num_dev);
2142 for (i = 0; i < ff_args->num_dev; i++)
2143 ff_layout_encode_ff_iostat(xdr,
2144 &args->layout->plh_stateid,
2145 &ff_args->devinfo[i]);
2146 }
2147
2148 static void
2149 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2150 unsigned int num_entries)
2151 {
2152 unsigned int i;
2153
2154 for (i = 0; i < num_entries; i++) {
2155 if (!devinfo[i].ld_private.ops)
2156 continue;
2157 if (!devinfo[i].ld_private.ops->free)
2158 continue;
2159 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2160 }
2161 }
2162
2163 static struct nfs4_deviceid_node *
2164 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2165 struct pnfs_device *pdev, gfp_t gfp_flags)
2166 {
2167 struct nfs4_ff_layout_ds *dsaddr;
2168
2169 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2170 if (!dsaddr)
2171 return NULL;
2172 return &dsaddr->id_node;
2173 }
2174
2175 static void
2176 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2177 const void *voidargs,
2178 const struct nfs4_xdr_opaque_data *ff_opaque)
2179 {
2180 const struct nfs4_layoutreturn_args *args = voidargs;
2181 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2182 struct xdr_buf tmp_buf = {
2183 .head = {
2184 [0] = {
2185 .iov_base = page_address(ff_args->pages[0]),
2186 },
2187 },
2188 .buflen = PAGE_SIZE,
2189 };
2190 struct xdr_stream tmp_xdr;
2191 __be32 *start;
2192
2193 dprintk("%s: Begin\n", __func__);
2194
2195 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2196
2197 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2198 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2199
2200 start = xdr_reserve_space(xdr, 4);
2201 *start = cpu_to_be32(tmp_buf.len);
2202 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2203
2204 dprintk("%s: Return\n", __func__);
2205 }
2206
2207 static void
2208 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2209 {
2210 struct nfs4_flexfile_layoutreturn_args *ff_args;
2211
2212 if (!args->data)
2213 return;
2214 ff_args = args->data;
2215 args->data = NULL;
2216
2217 ff_layout_free_ds_ioerr(&ff_args->errors);
2218 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2219
2220 put_page(ff_args->pages[0]);
2221 kfree(ff_args);
2222 }
2223
2224 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2225 .encode = ff_layout_encode_layoutreturn,
2226 .free = ff_layout_free_layoutreturn,
2227 };
2228
2229 static int
2230 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2231 {
2232 struct nfs4_flexfile_layoutreturn_args *ff_args;
2233 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2234
2235 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask());
2236 if (!ff_args)
2237 goto out_nomem;
2238 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
2239 if (!ff_args->pages[0])
2240 goto out_nomem_free;
2241
2242 INIT_LIST_HEAD(&ff_args->errors);
2243 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2244 &args->range, &ff_args->errors,
2245 FF_LAYOUTRETURN_MAXERR);
2246
2247 spin_lock(&args->inode->i_lock);
2248 ff_args->num_dev = ff_layout_mirror_prepare_stats(
2249 &ff_layout->generic_hdr, &ff_args->devinfo[0],
2250 ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN);
2251 spin_unlock(&args->inode->i_lock);
2252
2253 args->ld_private->ops = &layoutreturn_ops;
2254 args->ld_private->data = ff_args;
2255 return 0;
2256 out_nomem_free:
2257 kfree(ff_args);
2258 out_nomem:
2259 return -ENOMEM;
2260 }
2261
2262 #ifdef CONFIG_NFS_V4_2
2263 void
2264 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2265 {
2266 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2267 struct nfs42_layout_error *errors;
2268 LIST_HEAD(head);
2269
2270 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2271 return;
2272 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2273 if (list_empty(&head))
2274 return;
2275
2276 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors),
2277 nfs_io_gfp_mask());
2278 if (errors != NULL) {
2279 const struct nfs4_ff_layout_ds_err *pos;
2280 size_t n = 0;
2281
2282 list_for_each_entry(pos, &head, list) {
2283 errors[n].offset = pos->offset;
2284 errors[n].length = pos->length;
2285 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2286 errors[n].errors[0].dev_id = pos->deviceid;
2287 errors[n].errors[0].status = pos->status;
2288 errors[n].errors[0].opnum = pos->opnum;
2289 n++;
2290 if (!list_is_last(&pos->list, &head) &&
2291 n < NFS42_LAYOUTERROR_MAX)
2292 continue;
2293 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2294 break;
2295 n = 0;
2296 }
2297 kfree(errors);
2298 }
2299 ff_layout_free_ds_ioerr(&head);
2300 }
2301 #else
2302 void
2303 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2304 {
2305 }
2306 #endif
2307
2308 static int
2309 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2310 {
2311 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2312
2313 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2314 }
2315
2316 static size_t
2317 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2318 const int buflen)
2319 {
2320 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2321 const struct in6_addr *addr = &sin6->sin6_addr;
2322
2323 /*
2324 * RFC 4291, Section 2.2.2
2325 *
2326 * Shorthanded ANY address
2327 */
2328 if (ipv6_addr_any(addr))
2329 return snprintf(buf, buflen, "::");
2330
2331 /*
2332 * RFC 4291, Section 2.2.2
2333 *
2334 * Shorthanded loopback address
2335 */
2336 if (ipv6_addr_loopback(addr))
2337 return snprintf(buf, buflen, "::1");
2338
2339 /*
2340 * RFC 4291, Section 2.2.3
2341 *
2342 * Special presentation address format for mapped v4
2343 * addresses.
2344 */
2345 if (ipv6_addr_v4mapped(addr))
2346 return snprintf(buf, buflen, "::ffff:%pI4",
2347 &addr->s6_addr32[3]);
2348
2349 /*
2350 * RFC 4291, Section 2.2.1
2351 */
2352 return snprintf(buf, buflen, "%pI6c", addr);
2353 }
2354
2355 /* Derived from rpc_sockaddr2uaddr */
2356 static void
2357 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2358 {
2359 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2360 char portbuf[RPCBIND_MAXUADDRPLEN];
2361 char addrbuf[RPCBIND_MAXUADDRLEN];
2362 unsigned short port;
2363 int len, netid_len;
2364 __be32 *p;
2365
2366 switch (sap->sa_family) {
2367 case AF_INET:
2368 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2369 return;
2370 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2371 break;
2372 case AF_INET6:
2373 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2374 return;
2375 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2376 break;
2377 default:
2378 WARN_ON_ONCE(1);
2379 return;
2380 }
2381
2382 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2383 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2384
2385 netid_len = strlen(da->da_netid);
2386 p = xdr_reserve_space(xdr, 4 + netid_len);
2387 xdr_encode_opaque(p, da->da_netid, netid_len);
2388
2389 p = xdr_reserve_space(xdr, 4 + len);
2390 xdr_encode_opaque(p, addrbuf, len);
2391 }
2392
2393 static void
2394 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2395 ktime_t t)
2396 {
2397 struct timespec64 ts;
2398 __be32 *p;
2399
2400 p = xdr_reserve_space(xdr, 12);
2401 ts = ktime_to_timespec64(t);
2402 p = xdr_encode_hyper(p, ts.tv_sec);
2403 *p++ = cpu_to_be32(ts.tv_nsec);
2404 }
2405
2406 static void
2407 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2408 struct nfs4_ff_io_stat *stat)
2409 {
2410 __be32 *p;
2411
2412 p = xdr_reserve_space(xdr, 5 * 8);
2413 p = xdr_encode_hyper(p, stat->ops_requested);
2414 p = xdr_encode_hyper(p, stat->bytes_requested);
2415 p = xdr_encode_hyper(p, stat->ops_completed);
2416 p = xdr_encode_hyper(p, stat->bytes_completed);
2417 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2418 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2419 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2420 }
2421
2422 static void
2423 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2424 const struct nfs42_layoutstat_devinfo *devinfo,
2425 struct nfs4_ff_layout_mirror *mirror)
2426 {
2427 struct nfs4_pnfs_ds_addr *da;
2428 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2429 struct nfs_fh *fh = &mirror->fh_versions[0];
2430 __be32 *p;
2431
2432 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2433 dprintk("%s: DS %s: encoding address %s\n",
2434 __func__, ds->ds_remotestr, da->da_remotestr);
2435 /* netaddr4 */
2436 ff_layout_encode_netaddr(xdr, da);
2437 /* nfs_fh4 */
2438 p = xdr_reserve_space(xdr, 4 + fh->size);
2439 xdr_encode_opaque(p, fh->data, fh->size);
2440 /* ff_io_latency4 read */
2441 spin_lock(&mirror->lock);
2442 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2443 /* ff_io_latency4 write */
2444 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2445 spin_unlock(&mirror->lock);
2446 /* nfstime4 */
2447 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2448 /* bool */
2449 p = xdr_reserve_space(xdr, 4);
2450 *p = cpu_to_be32(false);
2451 }
2452
2453 static void
2454 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2455 const struct nfs4_xdr_opaque_data *opaque)
2456 {
2457 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2458 struct nfs42_layoutstat_devinfo, ld_private);
2459 __be32 *start;
2460
2461 /* layoutupdate length */
2462 start = xdr_reserve_space(xdr, 4);
2463 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2464
2465 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2466 }
2467
2468 static void
2469 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2470 {
2471 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2472
2473 ff_layout_put_mirror(mirror);
2474 }
2475
2476 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2477 .encode = ff_layout_encode_layoutstats,
2478 .free = ff_layout_free_layoutstats,
2479 };
2480
2481 static int
2482 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2483 struct nfs42_layoutstat_devinfo *devinfo,
2484 int dev_limit, enum nfs4_ff_op_type type)
2485 {
2486 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2487 struct nfs4_ff_layout_mirror *mirror;
2488 struct nfs4_deviceid_node *dev;
2489 int i = 0;
2490
2491 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2492 if (i >= dev_limit)
2493 break;
2494 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2495 continue;
2496 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL,
2497 &mirror->flags) &&
2498 type != NFS4_FF_OP_LAYOUTRETURN)
2499 continue;
2500 /* mirror refcount put in cleanup_layoutstats */
2501 if (!refcount_inc_not_zero(&mirror->ref))
2502 continue;
2503 dev = &mirror->mirror_ds->id_node;
2504 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2505 devinfo->offset = 0;
2506 devinfo->length = NFS4_MAX_UINT64;
2507 spin_lock(&mirror->lock);
2508 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2509 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2510 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2511 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2512 spin_unlock(&mirror->lock);
2513 devinfo->layout_type = LAYOUT_FLEX_FILES;
2514 devinfo->ld_private.ops = &layoutstat_ops;
2515 devinfo->ld_private.data = mirror;
2516
2517 devinfo++;
2518 i++;
2519 }
2520 return i;
2521 }
2522
2523 static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2524 {
2525 struct pnfs_layout_hdr *lo;
2526 struct nfs4_flexfile_layout *ff_layout;
2527 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2528
2529 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2530 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo),
2531 nfs_io_gfp_mask());
2532 if (!args->devinfo)
2533 return -ENOMEM;
2534
2535 spin_lock(&args->inode->i_lock);
2536 lo = NFS_I(args->inode)->layout;
2537 if (lo && pnfs_layout_is_valid(lo)) {
2538 ff_layout = FF_LAYOUT_FROM_HDR(lo);
2539 args->num_dev = ff_layout_mirror_prepare_stats(
2540 &ff_layout->generic_hdr, &args->devinfo[0], dev_count,
2541 NFS4_FF_OP_LAYOUTSTATS);
2542 } else
2543 args->num_dev = 0;
2544 spin_unlock(&args->inode->i_lock);
2545 if (!args->num_dev) {
2546 kfree(args->devinfo);
2547 args->devinfo = NULL;
2548 return -ENOENT;
2549 }
2550
2551 return 0;
2552 }
2553
2554 static int
2555 ff_layout_set_layoutdriver(struct nfs_server *server,
2556 const struct nfs_fh *dummy)
2557 {
2558 #if IS_ENABLED(CONFIG_NFS_V4_2)
2559 server->caps |= NFS_CAP_LAYOUTSTATS;
2560 #endif
2561 return 0;
2562 }
2563
2564 static const struct pnfs_commit_ops ff_layout_commit_ops = {
2565 .setup_ds_info = ff_layout_setup_ds_info,
2566 .release_ds_info = ff_layout_release_ds_info,
2567 .mark_request_commit = pnfs_layout_mark_request_commit,
2568 .clear_request_commit = pnfs_generic_clear_request_commit,
2569 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2570 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2571 .commit_pagelist = ff_layout_commit_pagelist,
2572 };
2573
2574 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2575 .id = LAYOUT_FLEX_FILES,
2576 .name = "LAYOUT_FLEX_FILES",
2577 .owner = THIS_MODULE,
2578 .flags = PNFS_LAYOUTGET_ON_OPEN,
2579 .max_layoutget_response = 4096, /* 1 page or so... */
2580 .set_layoutdriver = ff_layout_set_layoutdriver,
2581 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2582 .free_layout_hdr = ff_layout_free_layout_hdr,
2583 .alloc_lseg = ff_layout_alloc_lseg,
2584 .free_lseg = ff_layout_free_lseg,
2585 .add_lseg = ff_layout_add_lseg,
2586 .pg_read_ops = &ff_layout_pg_read_ops,
2587 .pg_write_ops = &ff_layout_pg_write_ops,
2588 .get_ds_info = ff_layout_get_ds_info,
2589 .free_deviceid_node = ff_layout_free_deviceid_node,
2590 .read_pagelist = ff_layout_read_pagelist,
2591 .write_pagelist = ff_layout_write_pagelist,
2592 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2593 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2594 .sync = pnfs_nfs_generic_sync,
2595 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2596 .cancel_io = ff_layout_cancel_io,
2597 };
2598
2599 static int __init nfs4flexfilelayout_init(void)
2600 {
2601 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2602 __func__);
2603 return pnfs_register_layoutdriver(&flexfilelayout_type);
2604 }
2605
2606 static void __exit nfs4flexfilelayout_exit(void)
2607 {
2608 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2609 __func__);
2610 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2611 }
2612
2613 MODULE_ALIAS("nfs-layouttype4-4");
2614
2615 MODULE_LICENSE("GPL");
2616 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2617
2618 module_init(nfs4flexfilelayout_init);
2619 module_exit(nfs4flexfilelayout_exit);
2620
2621 module_param(io_maxretrans, ushort, 0644);
2622 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
2623 "retries an I/O request before returning an error. ");
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git