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[mirror_ubuntu-artful-kernel.git] / fs / nfs / flexfilelayout / flexfilelayout.c
1 /*
2 * Module for pnfs flexfile layout driver.
3 *
4 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
5 *
6 * Tao Peng <bergwolf@primarydata.com>
7 */
8
9 #include <linux/nfs_fs.h>
10 #include <linux/nfs_page.h>
11 #include <linux/module.h>
12
13 #include <linux/sunrpc/metrics.h>
14
15 #include "flexfilelayout.h"
16 #include "../nfs4session.h"
17 #include "../nfs4idmap.h"
18 #include "../internal.h"
19 #include "../delegation.h"
20 #include "../nfs4trace.h"
21 #include "../iostat.h"
22 #include "../nfs.h"
23 #include "../nfs42.h"
24
25 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
26
27 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
28 #define FF_LAYOUTRETURN_MAXERR 20
29
30
31 static struct group_info *ff_zero_group;
32
33 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
34 struct nfs_pgio_header *hdr);
35 static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
36 struct nfs42_layoutstat_devinfo *devinfo,
37 int dev_limit);
38 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
39 const struct nfs42_layoutstat_devinfo *devinfo,
40 struct nfs4_ff_layout_mirror *mirror);
41
42 static struct pnfs_layout_hdr *
43 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
44 {
45 struct nfs4_flexfile_layout *ffl;
46
47 ffl = kzalloc(sizeof(*ffl), gfp_flags);
48 if (ffl) {
49 INIT_LIST_HEAD(&ffl->error_list);
50 INIT_LIST_HEAD(&ffl->mirrors);
51 ffl->last_report_time = ktime_get();
52 return &ffl->generic_hdr;
53 } else
54 return NULL;
55 }
56
57 static void
58 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
59 {
60 struct nfs4_ff_layout_ds_err *err, *n;
61
62 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
63 list) {
64 list_del(&err->list);
65 kfree(err);
66 }
67 kfree(FF_LAYOUT_FROM_HDR(lo));
68 }
69
70 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
71 {
72 __be32 *p;
73
74 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
75 if (unlikely(p == NULL))
76 return -ENOBUFS;
77 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
78 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
79 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
80 p[0], p[1], p[2], p[3]);
81 return 0;
82 }
83
84 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
85 {
86 __be32 *p;
87
88 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
89 if (unlikely(!p))
90 return -ENOBUFS;
91 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
92 nfs4_print_deviceid(devid);
93 return 0;
94 }
95
96 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
97 {
98 __be32 *p;
99
100 p = xdr_inline_decode(xdr, 4);
101 if (unlikely(!p))
102 return -ENOBUFS;
103 fh->size = be32_to_cpup(p++);
104 if (fh->size > sizeof(struct nfs_fh)) {
105 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
106 fh->size);
107 return -EOVERFLOW;
108 }
109 /* fh.data */
110 p = xdr_inline_decode(xdr, fh->size);
111 if (unlikely(!p))
112 return -ENOBUFS;
113 memcpy(&fh->data, p, fh->size);
114 dprintk("%s: fh len %d\n", __func__, fh->size);
115
116 return 0;
117 }
118
119 /*
120 * Currently only stringified uids and gids are accepted.
121 * I.e., kerberos is not supported to the DSes, so no pricipals.
122 *
123 * That means that one common function will suffice, but when
124 * principals are added, this should be split to accomodate
125 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
126 */
127 static int
128 decode_name(struct xdr_stream *xdr, u32 *id)
129 {
130 __be32 *p;
131 int len;
132
133 /* opaque_length(4)*/
134 p = xdr_inline_decode(xdr, 4);
135 if (unlikely(!p))
136 return -ENOBUFS;
137 len = be32_to_cpup(p++);
138 if (len < 0)
139 return -EINVAL;
140
141 dprintk("%s: len %u\n", __func__, len);
142
143 /* opaque body */
144 p = xdr_inline_decode(xdr, len);
145 if (unlikely(!p))
146 return -ENOBUFS;
147
148 if (!nfs_map_string_to_numeric((char *)p, len, id))
149 return -EINVAL;
150
151 return 0;
152 }
153
154 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
155 const struct nfs4_ff_layout_mirror *m2)
156 {
157 int i, j;
158
159 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
160 return false;
161 for (i = 0; i < m1->fh_versions_cnt; i++) {
162 bool found_fh = false;
163 for (j = 0; j < m2->fh_versions_cnt; j++) {
164 if (nfs_compare_fh(&m1->fh_versions[i],
165 &m2->fh_versions[j]) == 0) {
166 found_fh = true;
167 break;
168 }
169 }
170 if (!found_fh)
171 return false;
172 }
173 return true;
174 }
175
176 static struct nfs4_ff_layout_mirror *
177 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
178 struct nfs4_ff_layout_mirror *mirror)
179 {
180 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
181 struct nfs4_ff_layout_mirror *pos;
182 struct inode *inode = lo->plh_inode;
183
184 spin_lock(&inode->i_lock);
185 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
186 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
187 continue;
188 if (!ff_mirror_match_fh(mirror, pos))
189 continue;
190 if (atomic_inc_not_zero(&pos->ref)) {
191 spin_unlock(&inode->i_lock);
192 return pos;
193 }
194 }
195 list_add(&mirror->mirrors, &ff_layout->mirrors);
196 mirror->layout = lo;
197 spin_unlock(&inode->i_lock);
198 return mirror;
199 }
200
201 static void
202 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
203 {
204 struct inode *inode;
205 if (mirror->layout == NULL)
206 return;
207 inode = mirror->layout->plh_inode;
208 spin_lock(&inode->i_lock);
209 list_del(&mirror->mirrors);
210 spin_unlock(&inode->i_lock);
211 mirror->layout = NULL;
212 }
213
214 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
215 {
216 struct nfs4_ff_layout_mirror *mirror;
217
218 mirror = kzalloc(sizeof(*mirror), gfp_flags);
219 if (mirror != NULL) {
220 spin_lock_init(&mirror->lock);
221 atomic_set(&mirror->ref, 1);
222 INIT_LIST_HEAD(&mirror->mirrors);
223 }
224 return mirror;
225 }
226
227 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
228 {
229 struct rpc_cred *cred;
230
231 ff_layout_remove_mirror(mirror);
232 kfree(mirror->fh_versions);
233 cred = rcu_access_pointer(mirror->ro_cred);
234 if (cred)
235 put_rpccred(cred);
236 cred = rcu_access_pointer(mirror->rw_cred);
237 if (cred)
238 put_rpccred(cred);
239 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
240 kfree(mirror);
241 }
242
243 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
244 {
245 if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
246 ff_layout_free_mirror(mirror);
247 }
248
249 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
250 {
251 int i;
252
253 if (fls->mirror_array) {
254 for (i = 0; i < fls->mirror_array_cnt; i++) {
255 /* normally mirror_ds is freed in
256 * .free_deviceid_node but we still do it here
257 * for .alloc_lseg error path */
258 ff_layout_put_mirror(fls->mirror_array[i]);
259 }
260 kfree(fls->mirror_array);
261 fls->mirror_array = NULL;
262 }
263 }
264
265 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
266 {
267 int ret = 0;
268
269 dprintk("--> %s\n", __func__);
270
271 /* FIXME: remove this check when layout segment support is added */
272 if (lgr->range.offset != 0 ||
273 lgr->range.length != NFS4_MAX_UINT64) {
274 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
275 __func__);
276 ret = -EINVAL;
277 }
278
279 dprintk("--> %s returns %d\n", __func__, ret);
280 return ret;
281 }
282
283 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
284 {
285 if (fls) {
286 ff_layout_free_mirror_array(fls);
287 kfree(fls);
288 }
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
327 /* Mergeable: copy info from 'old' to 'new' */
328 if (new_end < old_end)
329 new_end = old_end;
330 if (new->pls_range.offset < old->pls_range.offset)
331 new->pls_range.offset = old->pls_range.offset;
332 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
333 new_end);
334 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
335 set_bit(NFS_LSEG_ROC, &new->pls_flags);
336 return true;
337 }
338
339 static void
340 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
341 struct pnfs_layout_segment *lseg,
342 struct list_head *free_me)
343 {
344 pnfs_generic_layout_insert_lseg(lo, lseg,
345 ff_lseg_range_is_after,
346 ff_lseg_merge,
347 free_me);
348 }
349
350 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
351 {
352 int i, j;
353
354 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
355 for (j = i + 1; j < fls->mirror_array_cnt; j++)
356 if (fls->mirror_array[i]->efficiency <
357 fls->mirror_array[j]->efficiency)
358 swap(fls->mirror_array[i],
359 fls->mirror_array[j]);
360 }
361 }
362
363 static struct pnfs_layout_segment *
364 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
365 struct nfs4_layoutget_res *lgr,
366 gfp_t gfp_flags)
367 {
368 struct pnfs_layout_segment *ret;
369 struct nfs4_ff_layout_segment *fls = NULL;
370 struct xdr_stream stream;
371 struct xdr_buf buf;
372 struct page *scratch;
373 u64 stripe_unit;
374 u32 mirror_array_cnt;
375 __be32 *p;
376 int i, rc;
377
378 dprintk("--> %s\n", __func__);
379 scratch = alloc_page(gfp_flags);
380 if (!scratch)
381 return ERR_PTR(-ENOMEM);
382
383 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
384 lgr->layoutp->len);
385 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
386
387 /* stripe unit and mirror_array_cnt */
388 rc = -EIO;
389 p = xdr_inline_decode(&stream, 8 + 4);
390 if (!p)
391 goto out_err_free;
392
393 p = xdr_decode_hyper(p, &stripe_unit);
394 mirror_array_cnt = be32_to_cpup(p++);
395 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
396 stripe_unit, mirror_array_cnt);
397
398 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
399 mirror_array_cnt == 0)
400 goto out_err_free;
401
402 rc = -ENOMEM;
403 fls = kzalloc(sizeof(*fls), gfp_flags);
404 if (!fls)
405 goto out_err_free;
406
407 fls->mirror_array_cnt = mirror_array_cnt;
408 fls->stripe_unit = stripe_unit;
409 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
410 sizeof(fls->mirror_array[0]), gfp_flags);
411 if (fls->mirror_array == NULL)
412 goto out_err_free;
413
414 for (i = 0; i < fls->mirror_array_cnt; i++) {
415 struct nfs4_ff_layout_mirror *mirror;
416 struct auth_cred acred = { .group_info = ff_zero_group };
417 struct rpc_cred __rcu *cred;
418 u32 ds_count, fh_count, id;
419 int j;
420
421 rc = -EIO;
422 p = xdr_inline_decode(&stream, 4);
423 if (!p)
424 goto out_err_free;
425 ds_count = be32_to_cpup(p);
426
427 /* FIXME: allow for striping? */
428 if (ds_count != 1)
429 goto out_err_free;
430
431 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
432 if (fls->mirror_array[i] == NULL) {
433 rc = -ENOMEM;
434 goto out_err_free;
435 }
436
437 fls->mirror_array[i]->ds_count = ds_count;
438
439 /* deviceid */
440 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
441 if (rc)
442 goto out_err_free;
443
444 /* efficiency */
445 rc = -EIO;
446 p = xdr_inline_decode(&stream, 4);
447 if (!p)
448 goto out_err_free;
449 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
450
451 /* stateid */
452 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
453 if (rc)
454 goto out_err_free;
455
456 /* fh */
457 p = xdr_inline_decode(&stream, 4);
458 if (!p)
459 goto out_err_free;
460 fh_count = be32_to_cpup(p);
461
462 fls->mirror_array[i]->fh_versions =
463 kzalloc(fh_count * sizeof(struct nfs_fh),
464 gfp_flags);
465 if (fls->mirror_array[i]->fh_versions == NULL) {
466 rc = -ENOMEM;
467 goto out_err_free;
468 }
469
470 for (j = 0; j < fh_count; j++) {
471 rc = decode_nfs_fh(&stream,
472 &fls->mirror_array[i]->fh_versions[j]);
473 if (rc)
474 goto out_err_free;
475 }
476
477 fls->mirror_array[i]->fh_versions_cnt = fh_count;
478
479 /* user */
480 rc = decode_name(&stream, &id);
481 if (rc)
482 goto out_err_free;
483
484 acred.uid = make_kuid(&init_user_ns, id);
485
486 /* group */
487 rc = decode_name(&stream, &id);
488 if (rc)
489 goto out_err_free;
490
491 acred.gid = make_kgid(&init_user_ns, id);
492
493 /* find the cred for it */
494 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
495 if (IS_ERR(cred)) {
496 rc = PTR_ERR(cred);
497 goto out_err_free;
498 }
499
500 if (lgr->range.iomode == IOMODE_READ)
501 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
502 else
503 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
504
505 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
506 if (mirror != fls->mirror_array[i]) {
507 /* swap cred ptrs so free_mirror will clean up old */
508 if (lgr->range.iomode == IOMODE_READ) {
509 cred = xchg(&mirror->ro_cred, cred);
510 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
511 } else {
512 cred = xchg(&mirror->rw_cred, cred);
513 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
514 }
515 ff_layout_free_mirror(fls->mirror_array[i]);
516 fls->mirror_array[i] = mirror;
517 }
518
519 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
520 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
521 from_kuid(&init_user_ns, acred.uid),
522 from_kgid(&init_user_ns, acred.gid));
523 }
524
525 p = xdr_inline_decode(&stream, 4);
526 if (!p)
527 goto out_sort_mirrors;
528 fls->flags = be32_to_cpup(p);
529
530 p = xdr_inline_decode(&stream, 4);
531 if (!p)
532 goto out_sort_mirrors;
533 for (i=0; i < fls->mirror_array_cnt; i++)
534 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
535
536 out_sort_mirrors:
537 ff_layout_sort_mirrors(fls);
538 rc = ff_layout_check_layout(lgr);
539 if (rc)
540 goto out_err_free;
541 ret = &fls->generic_hdr;
542 dprintk("<-- %s (success)\n", __func__);
543 out_free_page:
544 __free_page(scratch);
545 return ret;
546 out_err_free:
547 _ff_layout_free_lseg(fls);
548 ret = ERR_PTR(rc);
549 dprintk("<-- %s (%d)\n", __func__, rc);
550 goto out_free_page;
551 }
552
553 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
554 {
555 struct pnfs_layout_segment *lseg;
556
557 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
558 if (lseg->pls_range.iomode == IOMODE_RW)
559 return true;
560
561 return false;
562 }
563
564 static void
565 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
566 {
567 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
568
569 dprintk("--> %s\n", __func__);
570
571 if (lseg->pls_range.iomode == IOMODE_RW) {
572 struct nfs4_flexfile_layout *ffl;
573 struct inode *inode;
574
575 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
576 inode = ffl->generic_hdr.plh_inode;
577 spin_lock(&inode->i_lock);
578 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
579 ffl->commit_info.nbuckets = 0;
580 kfree(ffl->commit_info.buckets);
581 ffl->commit_info.buckets = NULL;
582 }
583 spin_unlock(&inode->i_lock);
584 }
585 _ff_layout_free_lseg(fls);
586 }
587
588 /* Return 1 until we have multiple lsegs support */
589 static int
590 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
591 {
592 return 1;
593 }
594
595 static void
596 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
597 {
598 /* first IO request? */
599 if (atomic_inc_return(&timer->n_ops) == 1) {
600 timer->start_time = now;
601 }
602 }
603
604 static ktime_t
605 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
606 {
607 ktime_t start;
608
609 if (atomic_dec_return(&timer->n_ops) < 0)
610 WARN_ON_ONCE(1);
611
612 start = timer->start_time;
613 timer->start_time = now;
614 return ktime_sub(now, start);
615 }
616
617 static bool
618 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
619 struct nfs4_ff_layoutstat *layoutstat,
620 ktime_t now)
621 {
622 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
623 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
624
625 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
626 if (!mirror->start_time)
627 mirror->start_time = now;
628 if (mirror->report_interval != 0)
629 report_interval = (s64)mirror->report_interval * 1000LL;
630 else if (layoutstats_timer != 0)
631 report_interval = (s64)layoutstats_timer * 1000LL;
632 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
633 report_interval) {
634 ffl->last_report_time = now;
635 return true;
636 }
637
638 return false;
639 }
640
641 static void
642 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
643 __u64 requested)
644 {
645 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
646
647 iostat->ops_requested++;
648 iostat->bytes_requested += requested;
649 }
650
651 static void
652 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
653 __u64 requested,
654 __u64 completed,
655 ktime_t time_completed,
656 ktime_t time_started)
657 {
658 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
659 ktime_t completion_time = ktime_sub(time_completed, time_started);
660 ktime_t timer;
661
662 iostat->ops_completed++;
663 iostat->bytes_completed += completed;
664 iostat->bytes_not_delivered += requested - completed;
665
666 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
667 iostat->total_busy_time =
668 ktime_add(iostat->total_busy_time, timer);
669 iostat->aggregate_completion_time =
670 ktime_add(iostat->aggregate_completion_time,
671 completion_time);
672 }
673
674 static void
675 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
676 struct nfs4_ff_layout_mirror *mirror,
677 __u64 requested, ktime_t now)
678 {
679 bool report;
680
681 spin_lock(&mirror->lock);
682 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
683 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
684 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
685 spin_unlock(&mirror->lock);
686
687 if (report)
688 pnfs_report_layoutstat(inode, GFP_KERNEL);
689 }
690
691 static void
692 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
693 struct nfs4_ff_layout_mirror *mirror,
694 __u64 requested,
695 __u64 completed)
696 {
697 spin_lock(&mirror->lock);
698 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
699 requested, completed,
700 ktime_get(), task->tk_start);
701 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
702 spin_unlock(&mirror->lock);
703 }
704
705 static void
706 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
707 struct nfs4_ff_layout_mirror *mirror,
708 __u64 requested, ktime_t now)
709 {
710 bool report;
711
712 spin_lock(&mirror->lock);
713 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
714 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
715 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
716 spin_unlock(&mirror->lock);
717
718 if (report)
719 pnfs_report_layoutstat(inode, GFP_NOIO);
720 }
721
722 static void
723 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
724 struct nfs4_ff_layout_mirror *mirror,
725 __u64 requested,
726 __u64 completed,
727 enum nfs3_stable_how committed)
728 {
729 if (committed == NFS_UNSTABLE)
730 requested = completed = 0;
731
732 spin_lock(&mirror->lock);
733 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
734 requested, completed, ktime_get(), task->tk_start);
735 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
736 spin_unlock(&mirror->lock);
737 }
738
739 static int
740 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
741 struct nfs_commit_info *cinfo,
742 gfp_t gfp_flags)
743 {
744 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
745 struct pnfs_commit_bucket *buckets;
746 int size;
747
748 if (cinfo->ds->nbuckets != 0) {
749 /* This assumes there is only one RW lseg per file.
750 * To support multiple lseg per file, we need to
751 * change struct pnfs_commit_bucket to allow dynamic
752 * increasing nbuckets.
753 */
754 return 0;
755 }
756
757 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
758
759 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
760 gfp_flags);
761 if (!buckets)
762 return -ENOMEM;
763 else {
764 int i;
765
766 spin_lock(&cinfo->inode->i_lock);
767 if (cinfo->ds->nbuckets != 0)
768 kfree(buckets);
769 else {
770 cinfo->ds->buckets = buckets;
771 cinfo->ds->nbuckets = size;
772 for (i = 0; i < size; i++) {
773 INIT_LIST_HEAD(&buckets[i].written);
774 INIT_LIST_HEAD(&buckets[i].committing);
775 /* mark direct verifier as unset */
776 buckets[i].direct_verf.committed =
777 NFS_INVALID_STABLE_HOW;
778 }
779 }
780 spin_unlock(&cinfo->inode->i_lock);
781 return 0;
782 }
783 }
784
785 static struct nfs4_pnfs_ds *
786 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
787 int start_idx,
788 int *best_idx)
789 {
790 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
791 struct nfs4_pnfs_ds *ds;
792 bool fail_return = false;
793 int idx;
794
795 /* mirrors are sorted by efficiency */
796 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
797 if (idx+1 == fls->mirror_array_cnt)
798 fail_return = true;
799 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
800 if (ds) {
801 *best_idx = idx;
802 return ds;
803 }
804 }
805
806 return NULL;
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 retry_strict:
815 pnfs_put_lseg(pgio->pg_lseg);
816 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
817 req->wb_context,
818 0,
819 NFS4_MAX_UINT64,
820 IOMODE_READ,
821 strict_iomode,
822 GFP_KERNEL);
823 if (IS_ERR(pgio->pg_lseg)) {
824 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
825 pgio->pg_lseg = NULL;
826 }
827
828 /* If we don't have checking, do get a IOMODE_RW
829 * segment, and the server wants to avoid READs
830 * there, then retry!
831 */
832 if (pgio->pg_lseg && !strict_iomode &&
833 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
834 strict_iomode = true;
835 goto retry_strict;
836 }
837 }
838
839 static void
840 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
841 struct nfs_page *req)
842 {
843 struct nfs_pgio_mirror *pgm;
844 struct nfs4_ff_layout_mirror *mirror;
845 struct nfs4_pnfs_ds *ds;
846 int ds_idx;
847
848 retry:
849 /* Use full layout for now */
850 if (!pgio->pg_lseg)
851 ff_layout_pg_get_read(pgio, req, false);
852 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
853 ff_layout_pg_get_read(pgio, req, true);
854
855 /* If no lseg, fall back to read through mds */
856 if (pgio->pg_lseg == NULL)
857 goto out_mds;
858
859 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
860 if (!ds) {
861 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
862 goto out_mds;
863 pnfs_put_lseg(pgio->pg_lseg);
864 pgio->pg_lseg = NULL;
865 /* Sleep for 1 second before retrying */
866 ssleep(1);
867 goto retry;
868 }
869
870 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
871
872 pgio->pg_mirror_idx = ds_idx;
873
874 /* read always uses only one mirror - idx 0 for pgio layer */
875 pgm = &pgio->pg_mirrors[0];
876 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
877
878 return;
879 out_mds:
880 pnfs_put_lseg(pgio->pg_lseg);
881 pgio->pg_lseg = NULL;
882 nfs_pageio_reset_read_mds(pgio);
883 }
884
885 static void
886 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
887 struct nfs_page *req)
888 {
889 struct nfs4_ff_layout_mirror *mirror;
890 struct nfs_pgio_mirror *pgm;
891 struct nfs_commit_info cinfo;
892 struct nfs4_pnfs_ds *ds;
893 int i;
894 int status;
895
896 retry:
897 if (!pgio->pg_lseg) {
898 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
899 req->wb_context,
900 0,
901 NFS4_MAX_UINT64,
902 IOMODE_RW,
903 false,
904 GFP_NOFS);
905 if (IS_ERR(pgio->pg_lseg)) {
906 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
907 pgio->pg_lseg = NULL;
908 return;
909 }
910 }
911 /* If no lseg, fall back to write through mds */
912 if (pgio->pg_lseg == NULL)
913 goto out_mds;
914
915 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
916 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
917 if (status < 0)
918 goto out_mds;
919
920 /* Use a direct mapping of ds_idx to pgio mirror_idx */
921 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
922 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
923 goto out_mds;
924
925 for (i = 0; i < pgio->pg_mirror_count; i++) {
926 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
927 if (!ds) {
928 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
929 goto out_mds;
930 pnfs_put_lseg(pgio->pg_lseg);
931 pgio->pg_lseg = NULL;
932 /* Sleep for 1 second before retrying */
933 ssleep(1);
934 goto retry;
935 }
936 pgm = &pgio->pg_mirrors[i];
937 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
938 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
939 }
940
941 return;
942
943 out_mds:
944 pnfs_put_lseg(pgio->pg_lseg);
945 pgio->pg_lseg = NULL;
946 nfs_pageio_reset_write_mds(pgio);
947 }
948
949 static unsigned int
950 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
951 struct nfs_page *req)
952 {
953 if (!pgio->pg_lseg) {
954 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
955 req->wb_context,
956 0,
957 NFS4_MAX_UINT64,
958 IOMODE_RW,
959 false,
960 GFP_NOFS);
961 if (IS_ERR(pgio->pg_lseg)) {
962 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
963 pgio->pg_lseg = NULL;
964 goto out;
965 }
966 }
967 if (pgio->pg_lseg)
968 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
969
970 /* no lseg means that pnfs is not in use, so no mirroring here */
971 nfs_pageio_reset_write_mds(pgio);
972 out:
973 return 1;
974 }
975
976 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
977 .pg_init = ff_layout_pg_init_read,
978 .pg_test = pnfs_generic_pg_test,
979 .pg_doio = pnfs_generic_pg_readpages,
980 .pg_cleanup = pnfs_generic_pg_cleanup,
981 };
982
983 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
984 .pg_init = ff_layout_pg_init_write,
985 .pg_test = pnfs_generic_pg_test,
986 .pg_doio = pnfs_generic_pg_writepages,
987 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
988 .pg_cleanup = pnfs_generic_pg_cleanup,
989 };
990
991 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
992 {
993 struct rpc_task *task = &hdr->task;
994
995 pnfs_layoutcommit_inode(hdr->inode, false);
996
997 if (retry_pnfs) {
998 dprintk("%s Reset task %5u for i/o through pNFS "
999 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1000 hdr->task.tk_pid,
1001 hdr->inode->i_sb->s_id,
1002 (unsigned long long)NFS_FILEID(hdr->inode),
1003 hdr->args.count,
1004 (unsigned long long)hdr->args.offset);
1005
1006 hdr->completion_ops->reschedule_io(hdr);
1007 return;
1008 }
1009
1010 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1011 dprintk("%s Reset task %5u for i/o through MDS "
1012 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1013 hdr->task.tk_pid,
1014 hdr->inode->i_sb->s_id,
1015 (unsigned long long)NFS_FILEID(hdr->inode),
1016 hdr->args.count,
1017 (unsigned long long)hdr->args.offset);
1018
1019 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1020 }
1021 }
1022
1023 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1024 {
1025 struct rpc_task *task = &hdr->task;
1026
1027 pnfs_layoutcommit_inode(hdr->inode, false);
1028
1029 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1030 dprintk("%s Reset task %5u for i/o through MDS "
1031 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1032 hdr->task.tk_pid,
1033 hdr->inode->i_sb->s_id,
1034 (unsigned long long)NFS_FILEID(hdr->inode),
1035 hdr->args.count,
1036 (unsigned long long)hdr->args.offset);
1037
1038 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1039 }
1040 }
1041
1042 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1043 struct nfs4_state *state,
1044 struct nfs_client *clp,
1045 struct pnfs_layout_segment *lseg,
1046 int idx)
1047 {
1048 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1049 struct inode *inode = lo->plh_inode;
1050 struct nfs_server *mds_server = NFS_SERVER(inode);
1051
1052 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1053 struct nfs_client *mds_client = mds_server->nfs_client;
1054 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1055
1056 if (task->tk_status >= 0)
1057 return 0;
1058
1059 switch (task->tk_status) {
1060 /* MDS state errors */
1061 case -NFS4ERR_DELEG_REVOKED:
1062 case -NFS4ERR_ADMIN_REVOKED:
1063 case -NFS4ERR_BAD_STATEID:
1064 if (state == NULL)
1065 break;
1066 nfs_remove_bad_delegation(state->inode, NULL);
1067 case -NFS4ERR_OPENMODE:
1068 if (state == NULL)
1069 break;
1070 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1071 goto out_bad_stateid;
1072 goto wait_on_recovery;
1073 case -NFS4ERR_EXPIRED:
1074 if (state != NULL) {
1075 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1076 goto out_bad_stateid;
1077 }
1078 nfs4_schedule_lease_recovery(mds_client);
1079 goto wait_on_recovery;
1080 /* DS session errors */
1081 case -NFS4ERR_BADSESSION:
1082 case -NFS4ERR_BADSLOT:
1083 case -NFS4ERR_BAD_HIGH_SLOT:
1084 case -NFS4ERR_DEADSESSION:
1085 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1086 case -NFS4ERR_SEQ_FALSE_RETRY:
1087 case -NFS4ERR_SEQ_MISORDERED:
1088 dprintk("%s ERROR %d, Reset session. Exchangeid "
1089 "flags 0x%x\n", __func__, task->tk_status,
1090 clp->cl_exchange_flags);
1091 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1092 break;
1093 case -NFS4ERR_DELAY:
1094 case -NFS4ERR_GRACE:
1095 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1096 break;
1097 case -NFS4ERR_RETRY_UNCACHED_REP:
1098 break;
1099 /* Invalidate Layout errors */
1100 case -NFS4ERR_PNFS_NO_LAYOUT:
1101 case -ESTALE: /* mapped NFS4ERR_STALE */
1102 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1103 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1104 case -NFS4ERR_FHEXPIRED:
1105 case -NFS4ERR_WRONG_TYPE:
1106 dprintk("%s Invalid layout error %d\n", __func__,
1107 task->tk_status);
1108 /*
1109 * Destroy layout so new i/o will get a new layout.
1110 * Layout will not be destroyed until all current lseg
1111 * references are put. Mark layout as invalid to resend failed
1112 * i/o and all i/o waiting on the slot table to the MDS until
1113 * layout is destroyed and a new valid layout is obtained.
1114 */
1115 pnfs_destroy_layout(NFS_I(inode));
1116 rpc_wake_up(&tbl->slot_tbl_waitq);
1117 goto reset;
1118 /* RPC connection errors */
1119 case -ECONNREFUSED:
1120 case -EHOSTDOWN:
1121 case -EHOSTUNREACH:
1122 case -ENETUNREACH:
1123 case -EIO:
1124 case -ETIMEDOUT:
1125 case -EPIPE:
1126 dprintk("%s DS connection error %d\n", __func__,
1127 task->tk_status);
1128 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1129 &devid->deviceid);
1130 rpc_wake_up(&tbl->slot_tbl_waitq);
1131 /* fall through */
1132 default:
1133 if (ff_layout_avoid_mds_available_ds(lseg))
1134 return -NFS4ERR_RESET_TO_PNFS;
1135 reset:
1136 dprintk("%s Retry through MDS. Error %d\n", __func__,
1137 task->tk_status);
1138 return -NFS4ERR_RESET_TO_MDS;
1139 }
1140 out:
1141 task->tk_status = 0;
1142 return -EAGAIN;
1143 out_bad_stateid:
1144 task->tk_status = -EIO;
1145 return 0;
1146 wait_on_recovery:
1147 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1148 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1149 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1150 goto out;
1151 }
1152
1153 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1154 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1155 struct pnfs_layout_segment *lseg,
1156 int idx)
1157 {
1158 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1159
1160 if (task->tk_status >= 0)
1161 return 0;
1162
1163 switch (task->tk_status) {
1164 /* File access problems. Don't mark the device as unavailable */
1165 case -EACCES:
1166 case -ESTALE:
1167 case -EISDIR:
1168 case -EBADHANDLE:
1169 case -ELOOP:
1170 case -ENOSPC:
1171 break;
1172 case -EJUKEBOX:
1173 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1174 goto out_retry;
1175 default:
1176 dprintk("%s DS connection error %d\n", __func__,
1177 task->tk_status);
1178 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1179 &devid->deviceid);
1180 }
1181 /* FIXME: Need to prevent infinite looping here. */
1182 return -NFS4ERR_RESET_TO_PNFS;
1183 out_retry:
1184 task->tk_status = 0;
1185 rpc_restart_call_prepare(task);
1186 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1187 return -EAGAIN;
1188 }
1189
1190 static int ff_layout_async_handle_error(struct rpc_task *task,
1191 struct nfs4_state *state,
1192 struct nfs_client *clp,
1193 struct pnfs_layout_segment *lseg,
1194 int idx)
1195 {
1196 int vers = clp->cl_nfs_mod->rpc_vers->number;
1197
1198 switch (vers) {
1199 case 3:
1200 return ff_layout_async_handle_error_v3(task, lseg, idx);
1201 case 4:
1202 return ff_layout_async_handle_error_v4(task, state, clp,
1203 lseg, idx);
1204 default:
1205 /* should never happen */
1206 WARN_ON_ONCE(1);
1207 return 0;
1208 }
1209 }
1210
1211 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1212 int idx, u64 offset, u64 length,
1213 u32 status, int opnum, int error)
1214 {
1215 struct nfs4_ff_layout_mirror *mirror;
1216 int err;
1217
1218 if (status == 0) {
1219 switch (error) {
1220 case -ETIMEDOUT:
1221 case -EPFNOSUPPORT:
1222 case -EPROTONOSUPPORT:
1223 case -EOPNOTSUPP:
1224 case -ECONNREFUSED:
1225 case -ECONNRESET:
1226 case -EHOSTDOWN:
1227 case -EHOSTUNREACH:
1228 case -ENETUNREACH:
1229 case -EADDRINUSE:
1230 case -ENOBUFS:
1231 case -EPIPE:
1232 case -EPERM:
1233 status = NFS4ERR_NXIO;
1234 break;
1235 case -EACCES:
1236 status = NFS4ERR_ACCESS;
1237 break;
1238 default:
1239 return;
1240 }
1241 }
1242
1243 switch (status) {
1244 case NFS4ERR_DELAY:
1245 case NFS4ERR_GRACE:
1246 return;
1247 default:
1248 break;
1249 }
1250
1251 mirror = FF_LAYOUT_COMP(lseg, idx);
1252 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1253 mirror, offset, length, status, opnum,
1254 GFP_NOIO);
1255 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1256 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1257 }
1258
1259 /* NFS_PROTO call done callback routines */
1260 static int ff_layout_read_done_cb(struct rpc_task *task,
1261 struct nfs_pgio_header *hdr)
1262 {
1263 int err;
1264
1265 trace_nfs4_pnfs_read(hdr, task->tk_status);
1266 if (task->tk_status < 0)
1267 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1268 hdr->args.offset, hdr->args.count,
1269 hdr->res.op_status, OP_READ,
1270 task->tk_status);
1271 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1272 hdr->ds_clp, hdr->lseg,
1273 hdr->pgio_mirror_idx);
1274
1275 switch (err) {
1276 case -NFS4ERR_RESET_TO_PNFS:
1277 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1278 hdr->pgio_mirror_idx + 1,
1279 &hdr->pgio_mirror_idx))
1280 goto out_eagain;
1281 ff_layout_read_record_layoutstats_done(task, hdr);
1282 pnfs_read_resend_pnfs(hdr);
1283 return task->tk_status;
1284 case -NFS4ERR_RESET_TO_MDS:
1285 ff_layout_reset_read(hdr);
1286 return task->tk_status;
1287 case -EAGAIN:
1288 goto out_eagain;
1289 }
1290
1291 return 0;
1292 out_eagain:
1293 rpc_restart_call_prepare(task);
1294 return -EAGAIN;
1295 }
1296
1297 static bool
1298 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1299 {
1300 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1301 }
1302
1303 /*
1304 * We reference the rpc_cred of the first WRITE that triggers the need for
1305 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1306 * rfc5661 is not clear about which credential should be used.
1307 *
1308 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1309 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1310 * we always send layoutcommit after DS writes.
1311 */
1312 static void
1313 ff_layout_set_layoutcommit(struct inode *inode,
1314 struct pnfs_layout_segment *lseg,
1315 loff_t end_offset)
1316 {
1317 if (!ff_layout_need_layoutcommit(lseg))
1318 return;
1319
1320 pnfs_set_layoutcommit(inode, lseg, end_offset);
1321 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1322 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1323 }
1324
1325 static bool
1326 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
1327 {
1328 /* No mirroring for now */
1329 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1330
1331 return ff_layout_test_devid_unavailable(node);
1332 }
1333
1334 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1335 struct nfs_pgio_header *hdr)
1336 {
1337 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1338 return;
1339 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1340 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1341 hdr->args.count,
1342 task->tk_start);
1343 }
1344
1345 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1346 struct nfs_pgio_header *hdr)
1347 {
1348 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1349 return;
1350 nfs4_ff_layout_stat_io_end_read(task,
1351 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1352 hdr->args.count,
1353 hdr->res.count);
1354 }
1355
1356 static int ff_layout_read_prepare_common(struct rpc_task *task,
1357 struct nfs_pgio_header *hdr)
1358 {
1359 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1360 rpc_exit(task, -EIO);
1361 return -EIO;
1362 }
1363 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1364 rpc_exit(task, -EHOSTDOWN);
1365 return -EAGAIN;
1366 }
1367
1368 ff_layout_read_record_layoutstats_start(task, hdr);
1369 return 0;
1370 }
1371
1372 /*
1373 * Call ops for the async read/write cases
1374 * In the case of dense layouts, the offset needs to be reset to its
1375 * original value.
1376 */
1377 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1378 {
1379 struct nfs_pgio_header *hdr = data;
1380
1381 if (ff_layout_read_prepare_common(task, hdr))
1382 return;
1383
1384 rpc_call_start(task);
1385 }
1386
1387 static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1388 struct nfs4_sequence_args *args,
1389 struct nfs4_sequence_res *res,
1390 struct rpc_task *task)
1391 {
1392 if (ds_clp->cl_session)
1393 return nfs41_setup_sequence(ds_clp->cl_session,
1394 args,
1395 res,
1396 task);
1397 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1398 args,
1399 res,
1400 task);
1401 }
1402
1403 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1404 {
1405 struct nfs_pgio_header *hdr = data;
1406
1407 if (ff_layout_setup_sequence(hdr->ds_clp,
1408 &hdr->args.seq_args,
1409 &hdr->res.seq_res,
1410 task))
1411 return;
1412
1413 if (ff_layout_read_prepare_common(task, hdr))
1414 return;
1415
1416 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1417 hdr->args.lock_context, FMODE_READ) == -EIO)
1418 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1419 }
1420
1421 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1422 {
1423 struct nfs_pgio_header *hdr = data;
1424
1425 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1426
1427 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1428 task->tk_status == 0) {
1429 nfs4_sequence_done(task, &hdr->res.seq_res);
1430 return;
1431 }
1432
1433 /* Note this may cause RPC to be resent */
1434 hdr->mds_ops->rpc_call_done(task, hdr);
1435 }
1436
1437 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1438 {
1439 struct nfs_pgio_header *hdr = data;
1440
1441 ff_layout_read_record_layoutstats_done(task, hdr);
1442 rpc_count_iostats_metrics(task,
1443 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1444 }
1445
1446 static void ff_layout_read_release(void *data)
1447 {
1448 struct nfs_pgio_header *hdr = data;
1449
1450 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1451 pnfs_generic_rw_release(data);
1452 }
1453
1454
1455 static int ff_layout_write_done_cb(struct rpc_task *task,
1456 struct nfs_pgio_header *hdr)
1457 {
1458 loff_t end_offs = 0;
1459 int err;
1460
1461 trace_nfs4_pnfs_write(hdr, task->tk_status);
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 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1468 hdr->ds_clp, hdr->lseg,
1469 hdr->pgio_mirror_idx);
1470
1471 switch (err) {
1472 case -NFS4ERR_RESET_TO_PNFS:
1473 ff_layout_reset_write(hdr, true);
1474 return task->tk_status;
1475 case -NFS4ERR_RESET_TO_MDS:
1476 ff_layout_reset_write(hdr, false);
1477 return task->tk_status;
1478 case -EAGAIN:
1479 return -EAGAIN;
1480 }
1481
1482 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1483 hdr->res.verf->committed == NFS_DATA_SYNC)
1484 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1485
1486 /* Note: if the write is unstable, don't set end_offs until commit */
1487 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1488
1489 /* zero out fattr since we don't care DS attr at all */
1490 hdr->fattr.valid = 0;
1491 if (task->tk_status >= 0)
1492 nfs_writeback_update_inode(hdr);
1493
1494 return 0;
1495 }
1496
1497 static int ff_layout_commit_done_cb(struct rpc_task *task,
1498 struct nfs_commit_data *data)
1499 {
1500 int err;
1501
1502 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1503 if (task->tk_status < 0)
1504 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1505 data->args.offset, data->args.count,
1506 data->res.op_status, OP_COMMIT,
1507 task->tk_status);
1508 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1509 data->lseg, data->ds_commit_index);
1510
1511 switch (err) {
1512 case -NFS4ERR_RESET_TO_PNFS:
1513 pnfs_generic_prepare_to_resend_writes(data);
1514 return -EAGAIN;
1515 case -NFS4ERR_RESET_TO_MDS:
1516 pnfs_generic_prepare_to_resend_writes(data);
1517 return -EAGAIN;
1518 case -EAGAIN:
1519 rpc_restart_call_prepare(task);
1520 return -EAGAIN;
1521 }
1522
1523 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1524
1525 return 0;
1526 }
1527
1528 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1529 struct nfs_pgio_header *hdr)
1530 {
1531 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1532 return;
1533 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1534 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1535 hdr->args.count,
1536 task->tk_start);
1537 }
1538
1539 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1540 struct nfs_pgio_header *hdr)
1541 {
1542 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1543 return;
1544 nfs4_ff_layout_stat_io_end_write(task,
1545 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1546 hdr->args.count, hdr->res.count,
1547 hdr->res.verf->committed);
1548 }
1549
1550 static int ff_layout_write_prepare_common(struct rpc_task *task,
1551 struct nfs_pgio_header *hdr)
1552 {
1553 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1554 rpc_exit(task, -EIO);
1555 return -EIO;
1556 }
1557
1558 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1559 rpc_exit(task, -EHOSTDOWN);
1560 return -EAGAIN;
1561 }
1562
1563 ff_layout_write_record_layoutstats_start(task, hdr);
1564 return 0;
1565 }
1566
1567 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1568 {
1569 struct nfs_pgio_header *hdr = data;
1570
1571 if (ff_layout_write_prepare_common(task, hdr))
1572 return;
1573
1574 rpc_call_start(task);
1575 }
1576
1577 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1578 {
1579 struct nfs_pgio_header *hdr = data;
1580
1581 if (ff_layout_setup_sequence(hdr->ds_clp,
1582 &hdr->args.seq_args,
1583 &hdr->res.seq_res,
1584 task))
1585 return;
1586
1587 if (ff_layout_write_prepare_common(task, hdr))
1588 return;
1589
1590 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1591 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1592 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1593 }
1594
1595 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1596 {
1597 struct nfs_pgio_header *hdr = data;
1598
1599 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1600 task->tk_status == 0) {
1601 nfs4_sequence_done(task, &hdr->res.seq_res);
1602 return;
1603 }
1604
1605 /* Note this may cause RPC to be resent */
1606 hdr->mds_ops->rpc_call_done(task, hdr);
1607 }
1608
1609 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1610 {
1611 struct nfs_pgio_header *hdr = data;
1612
1613 ff_layout_write_record_layoutstats_done(task, hdr);
1614 rpc_count_iostats_metrics(task,
1615 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1616 }
1617
1618 static void ff_layout_write_release(void *data)
1619 {
1620 struct nfs_pgio_header *hdr = data;
1621
1622 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1623 pnfs_generic_rw_release(data);
1624 }
1625
1626 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1627 struct nfs_commit_data *cdata)
1628 {
1629 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1630 return;
1631 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1632 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1633 0, task->tk_start);
1634 }
1635
1636 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1637 struct nfs_commit_data *cdata)
1638 {
1639 struct nfs_page *req;
1640 __u64 count = 0;
1641
1642 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1643 return;
1644
1645 if (task->tk_status == 0) {
1646 list_for_each_entry(req, &cdata->pages, wb_list)
1647 count += req->wb_bytes;
1648 }
1649 nfs4_ff_layout_stat_io_end_write(task,
1650 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1651 count, count, NFS_FILE_SYNC);
1652 }
1653
1654 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1655 struct nfs_commit_data *cdata)
1656 {
1657 ff_layout_commit_record_layoutstats_start(task, cdata);
1658 }
1659
1660 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1661 {
1662 ff_layout_commit_prepare_common(task, data);
1663 rpc_call_start(task);
1664 }
1665
1666 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1667 {
1668 struct nfs_commit_data *wdata = data;
1669
1670 if (ff_layout_setup_sequence(wdata->ds_clp,
1671 &wdata->args.seq_args,
1672 &wdata->res.seq_res,
1673 task))
1674 return;
1675 ff_layout_commit_prepare_common(task, data);
1676 }
1677
1678 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1679 {
1680 pnfs_generic_write_commit_done(task, data);
1681 }
1682
1683 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1684 {
1685 struct nfs_commit_data *cdata = data;
1686
1687 ff_layout_commit_record_layoutstats_done(task, cdata);
1688 rpc_count_iostats_metrics(task,
1689 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1690 }
1691
1692 static void ff_layout_commit_release(void *data)
1693 {
1694 struct nfs_commit_data *cdata = data;
1695
1696 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1697 pnfs_generic_commit_release(data);
1698 }
1699
1700 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1701 .rpc_call_prepare = ff_layout_read_prepare_v3,
1702 .rpc_call_done = ff_layout_read_call_done,
1703 .rpc_count_stats = ff_layout_read_count_stats,
1704 .rpc_release = ff_layout_read_release,
1705 };
1706
1707 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1708 .rpc_call_prepare = ff_layout_read_prepare_v4,
1709 .rpc_call_done = ff_layout_read_call_done,
1710 .rpc_count_stats = ff_layout_read_count_stats,
1711 .rpc_release = ff_layout_read_release,
1712 };
1713
1714 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1715 .rpc_call_prepare = ff_layout_write_prepare_v3,
1716 .rpc_call_done = ff_layout_write_call_done,
1717 .rpc_count_stats = ff_layout_write_count_stats,
1718 .rpc_release = ff_layout_write_release,
1719 };
1720
1721 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1722 .rpc_call_prepare = ff_layout_write_prepare_v4,
1723 .rpc_call_done = ff_layout_write_call_done,
1724 .rpc_count_stats = ff_layout_write_count_stats,
1725 .rpc_release = ff_layout_write_release,
1726 };
1727
1728 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1729 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1730 .rpc_call_done = ff_layout_commit_done,
1731 .rpc_count_stats = ff_layout_commit_count_stats,
1732 .rpc_release = ff_layout_commit_release,
1733 };
1734
1735 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1736 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1737 .rpc_call_done = ff_layout_commit_done,
1738 .rpc_count_stats = ff_layout_commit_count_stats,
1739 .rpc_release = ff_layout_commit_release,
1740 };
1741
1742 static enum pnfs_try_status
1743 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1744 {
1745 struct pnfs_layout_segment *lseg = hdr->lseg;
1746 struct nfs4_pnfs_ds *ds;
1747 struct rpc_clnt *ds_clnt;
1748 struct rpc_cred *ds_cred;
1749 loff_t offset = hdr->args.offset;
1750 u32 idx = hdr->pgio_mirror_idx;
1751 int vers;
1752 struct nfs_fh *fh;
1753
1754 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1755 __func__, hdr->inode->i_ino,
1756 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1757
1758 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1759 if (!ds)
1760 goto out_failed;
1761
1762 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1763 hdr->inode);
1764 if (IS_ERR(ds_clnt))
1765 goto out_failed;
1766
1767 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1768 if (!ds_cred)
1769 goto out_failed;
1770
1771 vers = nfs4_ff_layout_ds_version(lseg, idx);
1772
1773 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1774 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1775
1776 hdr->pgio_done_cb = ff_layout_read_done_cb;
1777 atomic_inc(&ds->ds_clp->cl_count);
1778 hdr->ds_clp = ds->ds_clp;
1779 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1780 if (fh)
1781 hdr->args.fh = fh;
1782 /*
1783 * Note that if we ever decide to split across DSes,
1784 * then we may need to handle dense-like offsets.
1785 */
1786 hdr->args.offset = offset;
1787 hdr->mds_offset = offset;
1788
1789 /* Perform an asynchronous read to ds */
1790 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1791 vers == 3 ? &ff_layout_read_call_ops_v3 :
1792 &ff_layout_read_call_ops_v4,
1793 0, RPC_TASK_SOFTCONN);
1794 put_rpccred(ds_cred);
1795 return PNFS_ATTEMPTED;
1796
1797 out_failed:
1798 if (ff_layout_avoid_mds_available_ds(lseg))
1799 return PNFS_TRY_AGAIN;
1800 return PNFS_NOT_ATTEMPTED;
1801 }
1802
1803 /* Perform async writes. */
1804 static enum pnfs_try_status
1805 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1806 {
1807 struct pnfs_layout_segment *lseg = hdr->lseg;
1808 struct nfs4_pnfs_ds *ds;
1809 struct rpc_clnt *ds_clnt;
1810 struct rpc_cred *ds_cred;
1811 loff_t offset = hdr->args.offset;
1812 int vers;
1813 struct nfs_fh *fh;
1814 int idx = hdr->pgio_mirror_idx;
1815
1816 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1817 if (!ds)
1818 return PNFS_NOT_ATTEMPTED;
1819
1820 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1821 hdr->inode);
1822 if (IS_ERR(ds_clnt))
1823 return PNFS_NOT_ATTEMPTED;
1824
1825 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1826 if (!ds_cred)
1827 return PNFS_NOT_ATTEMPTED;
1828
1829 vers = nfs4_ff_layout_ds_version(lseg, idx);
1830
1831 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1832 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1833 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1834 vers);
1835
1836 hdr->pgio_done_cb = ff_layout_write_done_cb;
1837 atomic_inc(&ds->ds_clp->cl_count);
1838 hdr->ds_clp = ds->ds_clp;
1839 hdr->ds_commit_idx = idx;
1840 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1841 if (fh)
1842 hdr->args.fh = fh;
1843
1844 /*
1845 * Note that if we ever decide to split across DSes,
1846 * then we may need to handle dense-like offsets.
1847 */
1848 hdr->args.offset = offset;
1849
1850 /* Perform an asynchronous write */
1851 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1852 vers == 3 ? &ff_layout_write_call_ops_v3 :
1853 &ff_layout_write_call_ops_v4,
1854 sync, RPC_TASK_SOFTCONN);
1855 put_rpccred(ds_cred);
1856 return PNFS_ATTEMPTED;
1857 }
1858
1859 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1860 {
1861 return i;
1862 }
1863
1864 static struct nfs_fh *
1865 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1866 {
1867 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1868
1869 /* FIXME: Assume that there is only one NFS version available
1870 * for the DS.
1871 */
1872 return &flseg->mirror_array[i]->fh_versions[0];
1873 }
1874
1875 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1876 {
1877 struct pnfs_layout_segment *lseg = data->lseg;
1878 struct nfs4_pnfs_ds *ds;
1879 struct rpc_clnt *ds_clnt;
1880 struct rpc_cred *ds_cred;
1881 u32 idx;
1882 int vers, ret;
1883 struct nfs_fh *fh;
1884
1885 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1886 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1887 if (!ds)
1888 goto out_err;
1889
1890 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1891 data->inode);
1892 if (IS_ERR(ds_clnt))
1893 goto out_err;
1894
1895 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1896 if (!ds_cred)
1897 goto out_err;
1898
1899 vers = nfs4_ff_layout_ds_version(lseg, idx);
1900
1901 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1902 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1903 vers);
1904 data->commit_done_cb = ff_layout_commit_done_cb;
1905 data->cred = ds_cred;
1906 atomic_inc(&ds->ds_clp->cl_count);
1907 data->ds_clp = ds->ds_clp;
1908 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1909 if (fh)
1910 data->args.fh = fh;
1911
1912 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1913 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1914 &ff_layout_commit_call_ops_v4,
1915 how, RPC_TASK_SOFTCONN);
1916 put_rpccred(ds_cred);
1917 return ret;
1918 out_err:
1919 pnfs_generic_prepare_to_resend_writes(data);
1920 pnfs_generic_commit_release(data);
1921 return -EAGAIN;
1922 }
1923
1924 static int
1925 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1926 int how, struct nfs_commit_info *cinfo)
1927 {
1928 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1929 ff_layout_initiate_commit);
1930 }
1931
1932 static struct pnfs_ds_commit_info *
1933 ff_layout_get_ds_info(struct inode *inode)
1934 {
1935 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1936
1937 if (layout == NULL)
1938 return NULL;
1939
1940 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1941 }
1942
1943 static void
1944 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1945 {
1946 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1947 id_node));
1948 }
1949
1950 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1951 const struct nfs4_layoutreturn_args *args,
1952 const struct nfs4_flexfile_layoutreturn_args *ff_args)
1953 {
1954 __be32 *start;
1955
1956 start = xdr_reserve_space(xdr, 4);
1957 if (unlikely(!start))
1958 return -E2BIG;
1959
1960 *start = cpu_to_be32(ff_args->num_errors);
1961 /* This assume we always return _ALL_ layouts */
1962 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
1963 }
1964
1965 static void
1966 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1967 {
1968 __be32 *p;
1969
1970 p = xdr_reserve_space(xdr, len);
1971 xdr_encode_opaque_fixed(p, buf, len);
1972 }
1973
1974 static void
1975 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1976 const nfs4_stateid *stateid,
1977 const struct nfs42_layoutstat_devinfo *devinfo)
1978 {
1979 __be32 *p;
1980
1981 p = xdr_reserve_space(xdr, 8 + 8);
1982 p = xdr_encode_hyper(p, devinfo->offset);
1983 p = xdr_encode_hyper(p, devinfo->length);
1984 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1985 p = xdr_reserve_space(xdr, 4*8);
1986 p = xdr_encode_hyper(p, devinfo->read_count);
1987 p = xdr_encode_hyper(p, devinfo->read_bytes);
1988 p = xdr_encode_hyper(p, devinfo->write_count);
1989 p = xdr_encode_hyper(p, devinfo->write_bytes);
1990 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1991 }
1992
1993 static void
1994 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1995 const nfs4_stateid *stateid,
1996 const struct nfs42_layoutstat_devinfo *devinfo)
1997 {
1998 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1999 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2000 devinfo->ld_private.data);
2001 }
2002
2003 /* report nothing for now */
2004 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2005 const struct nfs4_layoutreturn_args *args,
2006 struct nfs4_flexfile_layoutreturn_args *ff_args)
2007 {
2008 __be32 *p;
2009 int i;
2010
2011 p = xdr_reserve_space(xdr, 4);
2012 *p = cpu_to_be32(ff_args->num_dev);
2013 for (i = 0; i < ff_args->num_dev; i++)
2014 ff_layout_encode_ff_iostat(xdr,
2015 &args->layout->plh_stateid,
2016 &ff_args->devinfo[i]);
2017 }
2018
2019 static void
2020 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2021 unsigned int num_entries)
2022 {
2023 unsigned int i;
2024
2025 for (i = 0; i < num_entries; i++) {
2026 if (!devinfo[i].ld_private.ops)
2027 continue;
2028 if (!devinfo[i].ld_private.ops->free)
2029 continue;
2030 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2031 }
2032 }
2033
2034 static struct nfs4_deviceid_node *
2035 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2036 struct pnfs_device *pdev, gfp_t gfp_flags)
2037 {
2038 struct nfs4_ff_layout_ds *dsaddr;
2039
2040 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2041 if (!dsaddr)
2042 return NULL;
2043 return &dsaddr->id_node;
2044 }
2045
2046 static void
2047 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2048 const void *voidargs,
2049 const struct nfs4_xdr_opaque_data *ff_opaque)
2050 {
2051 const struct nfs4_layoutreturn_args *args = voidargs;
2052 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2053 struct xdr_buf tmp_buf = {
2054 .head = {
2055 [0] = {
2056 .iov_base = page_address(ff_args->pages[0]),
2057 },
2058 },
2059 .buflen = PAGE_SIZE,
2060 };
2061 struct xdr_stream tmp_xdr;
2062 __be32 *start;
2063
2064 dprintk("%s: Begin\n", __func__);
2065
2066 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2067
2068 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2069 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2070
2071 start = xdr_reserve_space(xdr, 4);
2072 *start = cpu_to_be32(tmp_buf.len);
2073 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2074
2075 dprintk("%s: Return\n", __func__);
2076 }
2077
2078 static void
2079 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2080 {
2081 struct nfs4_flexfile_layoutreturn_args *ff_args;
2082
2083 if (!args->data)
2084 return;
2085 ff_args = args->data;
2086 args->data = NULL;
2087
2088 ff_layout_free_ds_ioerr(&ff_args->errors);
2089 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2090
2091 put_page(ff_args->pages[0]);
2092 kfree(ff_args);
2093 }
2094
2095 const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2096 .encode = ff_layout_encode_layoutreturn,
2097 .free = ff_layout_free_layoutreturn,
2098 };
2099
2100 static int
2101 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2102 {
2103 struct nfs4_flexfile_layoutreturn_args *ff_args;
2104 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2105
2106 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2107 if (!ff_args)
2108 goto out_nomem;
2109 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2110 if (!ff_args->pages[0])
2111 goto out_nomem_free;
2112
2113 INIT_LIST_HEAD(&ff_args->errors);
2114 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2115 &args->range, &ff_args->errors,
2116 FF_LAYOUTRETURN_MAXERR);
2117
2118 spin_lock(&args->inode->i_lock);
2119 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2120 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2121 spin_unlock(&args->inode->i_lock);
2122
2123 args->ld_private->ops = &layoutreturn_ops;
2124 args->ld_private->data = ff_args;
2125 return 0;
2126 out_nomem_free:
2127 kfree(ff_args);
2128 out_nomem:
2129 return -ENOMEM;
2130 }
2131
2132 static int
2133 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2134 {
2135 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2136
2137 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2138 }
2139
2140 static size_t
2141 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2142 const int buflen)
2143 {
2144 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2145 const struct in6_addr *addr = &sin6->sin6_addr;
2146
2147 /*
2148 * RFC 4291, Section 2.2.2
2149 *
2150 * Shorthanded ANY address
2151 */
2152 if (ipv6_addr_any(addr))
2153 return snprintf(buf, buflen, "::");
2154
2155 /*
2156 * RFC 4291, Section 2.2.2
2157 *
2158 * Shorthanded loopback address
2159 */
2160 if (ipv6_addr_loopback(addr))
2161 return snprintf(buf, buflen, "::1");
2162
2163 /*
2164 * RFC 4291, Section 2.2.3
2165 *
2166 * Special presentation address format for mapped v4
2167 * addresses.
2168 */
2169 if (ipv6_addr_v4mapped(addr))
2170 return snprintf(buf, buflen, "::ffff:%pI4",
2171 &addr->s6_addr32[3]);
2172
2173 /*
2174 * RFC 4291, Section 2.2.1
2175 */
2176 return snprintf(buf, buflen, "%pI6c", addr);
2177 }
2178
2179 /* Derived from rpc_sockaddr2uaddr */
2180 static void
2181 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2182 {
2183 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2184 char portbuf[RPCBIND_MAXUADDRPLEN];
2185 char addrbuf[RPCBIND_MAXUADDRLEN];
2186 char *netid;
2187 unsigned short port;
2188 int len, netid_len;
2189 __be32 *p;
2190
2191 switch (sap->sa_family) {
2192 case AF_INET:
2193 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2194 return;
2195 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2196 netid = "tcp";
2197 netid_len = 3;
2198 break;
2199 case AF_INET6:
2200 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2201 return;
2202 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2203 netid = "tcp6";
2204 netid_len = 4;
2205 break;
2206 default:
2207 /* we only support tcp and tcp6 */
2208 WARN_ON_ONCE(1);
2209 return;
2210 }
2211
2212 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2213 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2214
2215 p = xdr_reserve_space(xdr, 4 + netid_len);
2216 xdr_encode_opaque(p, netid, netid_len);
2217
2218 p = xdr_reserve_space(xdr, 4 + len);
2219 xdr_encode_opaque(p, addrbuf, len);
2220 }
2221
2222 static void
2223 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2224 ktime_t t)
2225 {
2226 struct timespec64 ts;
2227 __be32 *p;
2228
2229 p = xdr_reserve_space(xdr, 12);
2230 ts = ktime_to_timespec64(t);
2231 p = xdr_encode_hyper(p, ts.tv_sec);
2232 *p++ = cpu_to_be32(ts.tv_nsec);
2233 }
2234
2235 static void
2236 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2237 struct nfs4_ff_io_stat *stat)
2238 {
2239 __be32 *p;
2240
2241 p = xdr_reserve_space(xdr, 5 * 8);
2242 p = xdr_encode_hyper(p, stat->ops_requested);
2243 p = xdr_encode_hyper(p, stat->bytes_requested);
2244 p = xdr_encode_hyper(p, stat->ops_completed);
2245 p = xdr_encode_hyper(p, stat->bytes_completed);
2246 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2247 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2248 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2249 }
2250
2251 static void
2252 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2253 const struct nfs42_layoutstat_devinfo *devinfo,
2254 struct nfs4_ff_layout_mirror *mirror)
2255 {
2256 struct nfs4_pnfs_ds_addr *da;
2257 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2258 struct nfs_fh *fh = &mirror->fh_versions[0];
2259 __be32 *p;
2260
2261 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2262 dprintk("%s: DS %s: encoding address %s\n",
2263 __func__, ds->ds_remotestr, da->da_remotestr);
2264 /* netaddr4 */
2265 ff_layout_encode_netaddr(xdr, da);
2266 /* nfs_fh4 */
2267 p = xdr_reserve_space(xdr, 4 + fh->size);
2268 xdr_encode_opaque(p, fh->data, fh->size);
2269 /* ff_io_latency4 read */
2270 spin_lock(&mirror->lock);
2271 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2272 /* ff_io_latency4 write */
2273 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2274 spin_unlock(&mirror->lock);
2275 /* nfstime4 */
2276 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2277 /* bool */
2278 p = xdr_reserve_space(xdr, 4);
2279 *p = cpu_to_be32(false);
2280 }
2281
2282 static void
2283 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2284 const struct nfs4_xdr_opaque_data *opaque)
2285 {
2286 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2287 struct nfs42_layoutstat_devinfo, ld_private);
2288 __be32 *start;
2289
2290 /* layoutupdate length */
2291 start = xdr_reserve_space(xdr, 4);
2292 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2293
2294 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2295 }
2296
2297 static void
2298 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2299 {
2300 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2301
2302 ff_layout_put_mirror(mirror);
2303 }
2304
2305 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2306 .encode = ff_layout_encode_layoutstats,
2307 .free = ff_layout_free_layoutstats,
2308 };
2309
2310 static int
2311 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2312 struct nfs42_layoutstat_devinfo *devinfo,
2313 int dev_limit)
2314 {
2315 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2316 struct nfs4_ff_layout_mirror *mirror;
2317 struct nfs4_deviceid_node *dev;
2318 int i = 0;
2319
2320 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2321 if (i >= dev_limit)
2322 break;
2323 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2324 continue;
2325 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2326 continue;
2327 /* mirror refcount put in cleanup_layoutstats */
2328 if (!atomic_inc_not_zero(&mirror->ref))
2329 continue;
2330 dev = &mirror->mirror_ds->id_node;
2331 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2332 devinfo->offset = 0;
2333 devinfo->length = NFS4_MAX_UINT64;
2334 spin_lock(&mirror->lock);
2335 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2336 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2337 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2338 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2339 spin_unlock(&mirror->lock);
2340 devinfo->layout_type = LAYOUT_FLEX_FILES;
2341 devinfo->ld_private.ops = &layoutstat_ops;
2342 devinfo->ld_private.data = mirror;
2343
2344 devinfo++;
2345 i++;
2346 }
2347 return i;
2348 }
2349
2350 static int
2351 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2352 {
2353 struct nfs4_flexfile_layout *ff_layout;
2354 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2355
2356 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2357 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2358 if (!args->devinfo)
2359 return -ENOMEM;
2360
2361 spin_lock(&args->inode->i_lock);
2362 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2363 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2364 &args->devinfo[0], dev_count);
2365 spin_unlock(&args->inode->i_lock);
2366 if (!args->num_dev) {
2367 kfree(args->devinfo);
2368 args->devinfo = NULL;
2369 return -ENOENT;
2370 }
2371
2372 return 0;
2373 }
2374
2375 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2376 .id = LAYOUT_FLEX_FILES,
2377 .name = "LAYOUT_FLEX_FILES",
2378 .owner = THIS_MODULE,
2379 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2380 .free_layout_hdr = ff_layout_free_layout_hdr,
2381 .alloc_lseg = ff_layout_alloc_lseg,
2382 .free_lseg = ff_layout_free_lseg,
2383 .add_lseg = ff_layout_add_lseg,
2384 .pg_read_ops = &ff_layout_pg_read_ops,
2385 .pg_write_ops = &ff_layout_pg_write_ops,
2386 .get_ds_info = ff_layout_get_ds_info,
2387 .free_deviceid_node = ff_layout_free_deviceid_node,
2388 .mark_request_commit = pnfs_layout_mark_request_commit,
2389 .clear_request_commit = pnfs_generic_clear_request_commit,
2390 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2391 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2392 .commit_pagelist = ff_layout_commit_pagelist,
2393 .read_pagelist = ff_layout_read_pagelist,
2394 .write_pagelist = ff_layout_write_pagelist,
2395 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2396 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2397 .sync = pnfs_nfs_generic_sync,
2398 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2399 };
2400
2401 static int __init nfs4flexfilelayout_init(void)
2402 {
2403 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2404 __func__);
2405 if (!ff_zero_group) {
2406 ff_zero_group = groups_alloc(0);
2407 if (!ff_zero_group)
2408 return -ENOMEM;
2409 }
2410 return pnfs_register_layoutdriver(&flexfilelayout_type);
2411 }
2412
2413 static void __exit nfs4flexfilelayout_exit(void)
2414 {
2415 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2416 __func__);
2417 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2418 if (ff_zero_group) {
2419 put_group_info(ff_zero_group);
2420 ff_zero_group = NULL;
2421 }
2422 }
2423
2424 MODULE_ALIAS("nfs-layouttype4-4");
2425
2426 MODULE_LICENSE("GPL");
2427 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2428
2429 module_init(nfs4flexfilelayout_init);
2430 module_exit(nfs4flexfilelayout_exit);
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