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net/sched: cls_flower: Reject duplicated rules also under skip_sw
[thirdparty/linux.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 (refcount_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 refcount_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 && refcount_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 rc = -EIO;
458 p = xdr_inline_decode(&stream, 4);
459 if (!p)
460 goto out_err_free;
461 fh_count = be32_to_cpup(p);
462
463 fls->mirror_array[i]->fh_versions =
464 kcalloc(fh_count, sizeof(struct nfs_fh),
465 gfp_flags);
466 if (fls->mirror_array[i]->fh_versions == NULL) {
467 rc = -ENOMEM;
468 goto out_err_free;
469 }
470
471 for (j = 0; j < fh_count; j++) {
472 rc = decode_nfs_fh(&stream,
473 &fls->mirror_array[i]->fh_versions[j]);
474 if (rc)
475 goto out_err_free;
476 }
477
478 fls->mirror_array[i]->fh_versions_cnt = fh_count;
479
480 /* user */
481 rc = decode_name(&stream, &id);
482 if (rc)
483 goto out_err_free;
484
485 acred.uid = make_kuid(&init_user_ns, id);
486
487 /* group */
488 rc = decode_name(&stream, &id);
489 if (rc)
490 goto out_err_free;
491
492 acred.gid = make_kgid(&init_user_ns, id);
493
494 /* find the cred for it */
495 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
496 if (IS_ERR(cred)) {
497 rc = PTR_ERR(cred);
498 goto out_err_free;
499 }
500
501 if (lgr->range.iomode == IOMODE_READ)
502 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
503 else
504 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
505
506 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
507 if (mirror != fls->mirror_array[i]) {
508 /* swap cred ptrs so free_mirror will clean up old */
509 if (lgr->range.iomode == IOMODE_READ) {
510 cred = xchg(&mirror->ro_cred, cred);
511 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
512 } else {
513 cred = xchg(&mirror->rw_cred, cred);
514 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
515 }
516 ff_layout_free_mirror(fls->mirror_array[i]);
517 fls->mirror_array[i] = mirror;
518 }
519
520 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
521 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
522 from_kuid(&init_user_ns, acred.uid),
523 from_kgid(&init_user_ns, acred.gid));
524 }
525
526 p = xdr_inline_decode(&stream, 4);
527 if (!p)
528 goto out_sort_mirrors;
529 fls->flags = be32_to_cpup(p);
530
531 p = xdr_inline_decode(&stream, 4);
532 if (!p)
533 goto out_sort_mirrors;
534 for (i=0; i < fls->mirror_array_cnt; i++)
535 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
536
537 out_sort_mirrors:
538 ff_layout_sort_mirrors(fls);
539 rc = ff_layout_check_layout(lgr);
540 if (rc)
541 goto out_err_free;
542 ret = &fls->generic_hdr;
543 dprintk("<-- %s (success)\n", __func__);
544 out_free_page:
545 __free_page(scratch);
546 return ret;
547 out_err_free:
548 _ff_layout_free_lseg(fls);
549 ret = ERR_PTR(rc);
550 dprintk("<-- %s (%d)\n", __func__, rc);
551 goto out_free_page;
552 }
553
554 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
555 {
556 struct pnfs_layout_segment *lseg;
557
558 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
559 if (lseg->pls_range.iomode == IOMODE_RW)
560 return true;
561
562 return false;
563 }
564
565 static void
566 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
567 {
568 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
569
570 dprintk("--> %s\n", __func__);
571
572 if (lseg->pls_range.iomode == IOMODE_RW) {
573 struct nfs4_flexfile_layout *ffl;
574 struct inode *inode;
575
576 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
577 inode = ffl->generic_hdr.plh_inode;
578 spin_lock(&inode->i_lock);
579 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
580 ffl->commit_info.nbuckets = 0;
581 kfree(ffl->commit_info.buckets);
582 ffl->commit_info.buckets = NULL;
583 }
584 spin_unlock(&inode->i_lock);
585 }
586 _ff_layout_free_lseg(fls);
587 }
588
589 /* Return 1 until we have multiple lsegs support */
590 static int
591 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
592 {
593 return 1;
594 }
595
596 static void
597 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
598 {
599 /* first IO request? */
600 if (atomic_inc_return(&timer->n_ops) == 1) {
601 timer->start_time = now;
602 }
603 }
604
605 static ktime_t
606 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
607 {
608 ktime_t start;
609
610 if (atomic_dec_return(&timer->n_ops) < 0)
611 WARN_ON_ONCE(1);
612
613 start = timer->start_time;
614 timer->start_time = now;
615 return ktime_sub(now, start);
616 }
617
618 static bool
619 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
620 struct nfs4_ff_layoutstat *layoutstat,
621 ktime_t now)
622 {
623 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
624 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
625
626 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
627 if (!mirror->start_time)
628 mirror->start_time = now;
629 if (mirror->report_interval != 0)
630 report_interval = (s64)mirror->report_interval * 1000LL;
631 else if (layoutstats_timer != 0)
632 report_interval = (s64)layoutstats_timer * 1000LL;
633 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
634 report_interval) {
635 ffl->last_report_time = now;
636 return true;
637 }
638
639 return false;
640 }
641
642 static void
643 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
644 __u64 requested)
645 {
646 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
647
648 iostat->ops_requested++;
649 iostat->bytes_requested += requested;
650 }
651
652 static void
653 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
654 __u64 requested,
655 __u64 completed,
656 ktime_t time_completed,
657 ktime_t time_started)
658 {
659 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
660 ktime_t completion_time = ktime_sub(time_completed, time_started);
661 ktime_t timer;
662
663 iostat->ops_completed++;
664 iostat->bytes_completed += completed;
665 iostat->bytes_not_delivered += requested - completed;
666
667 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
668 iostat->total_busy_time =
669 ktime_add(iostat->total_busy_time, timer);
670 iostat->aggregate_completion_time =
671 ktime_add(iostat->aggregate_completion_time,
672 completion_time);
673 }
674
675 static void
676 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
677 struct nfs4_ff_layout_mirror *mirror,
678 __u64 requested, ktime_t now)
679 {
680 bool report;
681
682 spin_lock(&mirror->lock);
683 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
684 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
685 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
686 spin_unlock(&mirror->lock);
687
688 if (report)
689 pnfs_report_layoutstat(inode, GFP_KERNEL);
690 }
691
692 static void
693 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
694 struct nfs4_ff_layout_mirror *mirror,
695 __u64 requested,
696 __u64 completed)
697 {
698 spin_lock(&mirror->lock);
699 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
700 requested, completed,
701 ktime_get(), task->tk_start);
702 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
703 spin_unlock(&mirror->lock);
704 }
705
706 static void
707 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
708 struct nfs4_ff_layout_mirror *mirror,
709 __u64 requested, ktime_t now)
710 {
711 bool report;
712
713 spin_lock(&mirror->lock);
714 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
715 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
716 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
717 spin_unlock(&mirror->lock);
718
719 if (report)
720 pnfs_report_layoutstat(inode, GFP_NOIO);
721 }
722
723 static void
724 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
725 struct nfs4_ff_layout_mirror *mirror,
726 __u64 requested,
727 __u64 completed,
728 enum nfs3_stable_how committed)
729 {
730 if (committed == NFS_UNSTABLE)
731 requested = completed = 0;
732
733 spin_lock(&mirror->lock);
734 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
735 requested, completed, ktime_get(), task->tk_start);
736 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
737 spin_unlock(&mirror->lock);
738 }
739
740 static int
741 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
742 struct nfs_commit_info *cinfo,
743 gfp_t gfp_flags)
744 {
745 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
746 struct pnfs_commit_bucket *buckets;
747 int size;
748
749 if (cinfo->ds->nbuckets != 0) {
750 /* This assumes there is only one RW lseg per file.
751 * To support multiple lseg per file, we need to
752 * change struct pnfs_commit_bucket to allow dynamic
753 * increasing nbuckets.
754 */
755 return 0;
756 }
757
758 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
759
760 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
761 gfp_flags);
762 if (!buckets)
763 return -ENOMEM;
764 else {
765 int i;
766
767 spin_lock(&cinfo->inode->i_lock);
768 if (cinfo->ds->nbuckets != 0)
769 kfree(buckets);
770 else {
771 cinfo->ds->buckets = buckets;
772 cinfo->ds->nbuckets = size;
773 for (i = 0; i < size; i++) {
774 INIT_LIST_HEAD(&buckets[i].written);
775 INIT_LIST_HEAD(&buckets[i].committing);
776 /* mark direct verifier as unset */
777 buckets[i].direct_verf.committed =
778 NFS_INVALID_STABLE_HOW;
779 }
780 }
781 spin_unlock(&cinfo->inode->i_lock);
782 return 0;
783 }
784 }
785
786 static struct nfs4_pnfs_ds *
787 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
788 int start_idx,
789 int *best_idx)
790 {
791 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
792 struct nfs4_pnfs_ds *ds;
793 bool fail_return = false;
794 int idx;
795
796 /* mirrors are sorted by efficiency */
797 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
798 if (idx+1 == fls->mirror_array_cnt)
799 fail_return = true;
800 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
801 if (ds) {
802 *best_idx = idx;
803 return ds;
804 }
805 }
806
807 return NULL;
808 }
809
810 static void
811 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
812 struct nfs_page *req,
813 bool strict_iomode)
814 {
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
829 static void
830 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
831 struct nfs_page *req)
832 {
833 struct nfs_pgio_mirror *pgm;
834 struct nfs4_ff_layout_mirror *mirror;
835 struct nfs4_pnfs_ds *ds;
836 int ds_idx;
837
838 retry:
839 pnfs_generic_pg_check_layout(pgio);
840 /* Use full layout for now */
841 if (!pgio->pg_lseg) {
842 ff_layout_pg_get_read(pgio, req, false);
843 if (!pgio->pg_lseg)
844 goto out_nolseg;
845 }
846 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
847 ff_layout_pg_get_read(pgio, req, true);
848 if (!pgio->pg_lseg)
849 goto out_nolseg;
850 }
851
852 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
853 if (!ds) {
854 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
855 goto out_mds;
856 pnfs_put_lseg(pgio->pg_lseg);
857 pgio->pg_lseg = NULL;
858 /* Sleep for 1 second before retrying */
859 ssleep(1);
860 goto retry;
861 }
862
863 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
864
865 pgio->pg_mirror_idx = ds_idx;
866
867 /* read always uses only one mirror - idx 0 for pgio layer */
868 pgm = &pgio->pg_mirrors[0];
869 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
870
871 return;
872 out_nolseg:
873 if (pgio->pg_error < 0)
874 return;
875 out_mds:
876 pnfs_put_lseg(pgio->pg_lseg);
877 pgio->pg_lseg = NULL;
878 nfs_pageio_reset_read_mds(pgio);
879 }
880
881 static void
882 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
883 struct nfs_page *req)
884 {
885 struct nfs4_ff_layout_mirror *mirror;
886 struct nfs_pgio_mirror *pgm;
887 struct nfs_commit_info cinfo;
888 struct nfs4_pnfs_ds *ds;
889 int i;
890 int status;
891
892 retry:
893 pnfs_generic_pg_check_layout(pgio);
894 if (!pgio->pg_lseg) {
895 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
896 req->wb_context,
897 0,
898 NFS4_MAX_UINT64,
899 IOMODE_RW,
900 false,
901 GFP_NOFS);
902 if (IS_ERR(pgio->pg_lseg)) {
903 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
904 pgio->pg_lseg = NULL;
905 return;
906 }
907 }
908 /* If no lseg, fall back to write through mds */
909 if (pgio->pg_lseg == NULL)
910 goto out_mds;
911
912 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
913 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
914 if (status < 0)
915 goto out_mds;
916
917 /* Use a direct mapping of ds_idx to pgio mirror_idx */
918 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
919 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
920 goto out_mds;
921
922 for (i = 0; i < pgio->pg_mirror_count; i++) {
923 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
924 if (!ds) {
925 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
926 goto out_mds;
927 pnfs_put_lseg(pgio->pg_lseg);
928 pgio->pg_lseg = NULL;
929 /* Sleep for 1 second before retrying */
930 ssleep(1);
931 goto retry;
932 }
933 pgm = &pgio->pg_mirrors[i];
934 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
935 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
936 }
937
938 return;
939
940 out_mds:
941 pnfs_put_lseg(pgio->pg_lseg);
942 pgio->pg_lseg = NULL;
943 nfs_pageio_reset_write_mds(pgio);
944 }
945
946 static unsigned int
947 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
948 struct nfs_page *req)
949 {
950 if (!pgio->pg_lseg) {
951 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
952 req->wb_context,
953 0,
954 NFS4_MAX_UINT64,
955 IOMODE_RW,
956 false,
957 GFP_NOFS);
958 if (IS_ERR(pgio->pg_lseg)) {
959 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
960 pgio->pg_lseg = NULL;
961 goto out;
962 }
963 }
964 if (pgio->pg_lseg)
965 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
966
967 /* no lseg means that pnfs is not in use, so no mirroring here */
968 nfs_pageio_reset_write_mds(pgio);
969 out:
970 return 1;
971 }
972
973 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
974 .pg_init = ff_layout_pg_init_read,
975 .pg_test = pnfs_generic_pg_test,
976 .pg_doio = pnfs_generic_pg_readpages,
977 .pg_cleanup = pnfs_generic_pg_cleanup,
978 };
979
980 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
981 .pg_init = ff_layout_pg_init_write,
982 .pg_test = pnfs_generic_pg_test,
983 .pg_doio = pnfs_generic_pg_writepages,
984 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
985 .pg_cleanup = pnfs_generic_pg_cleanup,
986 };
987
988 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
989 {
990 struct rpc_task *task = &hdr->task;
991
992 pnfs_layoutcommit_inode(hdr->inode, false);
993
994 if (retry_pnfs) {
995 dprintk("%s Reset task %5u for i/o through pNFS "
996 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
997 hdr->task.tk_pid,
998 hdr->inode->i_sb->s_id,
999 (unsigned long long)NFS_FILEID(hdr->inode),
1000 hdr->args.count,
1001 (unsigned long long)hdr->args.offset);
1002
1003 hdr->completion_ops->reschedule_io(hdr);
1004 return;
1005 }
1006
1007 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1008 dprintk("%s Reset task %5u for i/o through MDS "
1009 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1010 hdr->task.tk_pid,
1011 hdr->inode->i_sb->s_id,
1012 (unsigned long long)NFS_FILEID(hdr->inode),
1013 hdr->args.count,
1014 (unsigned long long)hdr->args.offset);
1015
1016 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1017 }
1018 }
1019
1020 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1021 {
1022 struct rpc_task *task = &hdr->task;
1023
1024 pnfs_layoutcommit_inode(hdr->inode, false);
1025
1026 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1027 dprintk("%s Reset task %5u for i/o through MDS "
1028 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1029 hdr->task.tk_pid,
1030 hdr->inode->i_sb->s_id,
1031 (unsigned long long)NFS_FILEID(hdr->inode),
1032 hdr->args.count,
1033 (unsigned long long)hdr->args.offset);
1034
1035 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1036 }
1037 }
1038
1039 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1040 struct nfs4_state *state,
1041 struct nfs_client *clp,
1042 struct pnfs_layout_segment *lseg,
1043 int idx)
1044 {
1045 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1046 struct inode *inode = lo->plh_inode;
1047 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1048 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1049
1050 switch (task->tk_status) {
1051 case -NFS4ERR_BADSESSION:
1052 case -NFS4ERR_BADSLOT:
1053 case -NFS4ERR_BAD_HIGH_SLOT:
1054 case -NFS4ERR_DEADSESSION:
1055 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1056 case -NFS4ERR_SEQ_FALSE_RETRY:
1057 case -NFS4ERR_SEQ_MISORDERED:
1058 dprintk("%s ERROR %d, Reset session. Exchangeid "
1059 "flags 0x%x\n", __func__, task->tk_status,
1060 clp->cl_exchange_flags);
1061 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1062 break;
1063 case -NFS4ERR_DELAY:
1064 case -NFS4ERR_GRACE:
1065 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1066 break;
1067 case -NFS4ERR_RETRY_UNCACHED_REP:
1068 break;
1069 /* Invalidate Layout errors */
1070 case -NFS4ERR_PNFS_NO_LAYOUT:
1071 case -ESTALE: /* mapped NFS4ERR_STALE */
1072 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1073 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1074 case -NFS4ERR_FHEXPIRED:
1075 case -NFS4ERR_WRONG_TYPE:
1076 dprintk("%s Invalid layout error %d\n", __func__,
1077 task->tk_status);
1078 /*
1079 * Destroy layout so new i/o will get a new layout.
1080 * Layout will not be destroyed until all current lseg
1081 * references are put. Mark layout as invalid to resend failed
1082 * i/o and all i/o waiting on the slot table to the MDS until
1083 * layout is destroyed and a new valid layout is obtained.
1084 */
1085 pnfs_destroy_layout(NFS_I(inode));
1086 rpc_wake_up(&tbl->slot_tbl_waitq);
1087 goto reset;
1088 /* RPC connection errors */
1089 case -ECONNREFUSED:
1090 case -EHOSTDOWN:
1091 case -EHOSTUNREACH:
1092 case -ENETUNREACH:
1093 case -EIO:
1094 case -ETIMEDOUT:
1095 case -EPIPE:
1096 dprintk("%s DS connection error %d\n", __func__,
1097 task->tk_status);
1098 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1099 &devid->deviceid);
1100 rpc_wake_up(&tbl->slot_tbl_waitq);
1101 /* fall through */
1102 default:
1103 if (ff_layout_avoid_mds_available_ds(lseg))
1104 return -NFS4ERR_RESET_TO_PNFS;
1105 reset:
1106 dprintk("%s Retry through MDS. Error %d\n", __func__,
1107 task->tk_status);
1108 return -NFS4ERR_RESET_TO_MDS;
1109 }
1110 task->tk_status = 0;
1111 return -EAGAIN;
1112 }
1113
1114 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1115 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1116 struct pnfs_layout_segment *lseg,
1117 int idx)
1118 {
1119 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1120
1121 switch (task->tk_status) {
1122 /* File access problems. Don't mark the device as unavailable */
1123 case -EACCES:
1124 case -ESTALE:
1125 case -EISDIR:
1126 case -EBADHANDLE:
1127 case -ELOOP:
1128 case -ENOSPC:
1129 break;
1130 case -EJUKEBOX:
1131 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1132 goto out_retry;
1133 default:
1134 dprintk("%s DS connection error %d\n", __func__,
1135 task->tk_status);
1136 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1137 &devid->deviceid);
1138 }
1139 /* FIXME: Need to prevent infinite looping here. */
1140 return -NFS4ERR_RESET_TO_PNFS;
1141 out_retry:
1142 task->tk_status = 0;
1143 rpc_restart_call_prepare(task);
1144 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1145 return -EAGAIN;
1146 }
1147
1148 static int ff_layout_async_handle_error(struct rpc_task *task,
1149 struct nfs4_state *state,
1150 struct nfs_client *clp,
1151 struct pnfs_layout_segment *lseg,
1152 int idx)
1153 {
1154 int vers = clp->cl_nfs_mod->rpc_vers->number;
1155
1156 if (task->tk_status >= 0)
1157 return 0;
1158
1159 /* Handle the case of an invalid layout segment */
1160 if (!pnfs_is_valid_lseg(lseg))
1161 return -NFS4ERR_RESET_TO_PNFS;
1162
1163 switch (vers) {
1164 case 3:
1165 return ff_layout_async_handle_error_v3(task, lseg, idx);
1166 case 4:
1167 return ff_layout_async_handle_error_v4(task, state, clp,
1168 lseg, idx);
1169 default:
1170 /* should never happen */
1171 WARN_ON_ONCE(1);
1172 return 0;
1173 }
1174 }
1175
1176 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1177 int idx, u64 offset, u64 length,
1178 u32 status, int opnum, int error)
1179 {
1180 struct nfs4_ff_layout_mirror *mirror;
1181 int err;
1182
1183 if (status == 0) {
1184 switch (error) {
1185 case -ETIMEDOUT:
1186 case -EPFNOSUPPORT:
1187 case -EPROTONOSUPPORT:
1188 case -EOPNOTSUPP:
1189 case -ECONNREFUSED:
1190 case -ECONNRESET:
1191 case -EHOSTDOWN:
1192 case -EHOSTUNREACH:
1193 case -ENETUNREACH:
1194 case -EADDRINUSE:
1195 case -ENOBUFS:
1196 case -EPIPE:
1197 case -EPERM:
1198 status = NFS4ERR_NXIO;
1199 break;
1200 case -EACCES:
1201 status = NFS4ERR_ACCESS;
1202 break;
1203 default:
1204 return;
1205 }
1206 }
1207
1208 switch (status) {
1209 case NFS4ERR_DELAY:
1210 case NFS4ERR_GRACE:
1211 return;
1212 default:
1213 break;
1214 }
1215
1216 mirror = FF_LAYOUT_COMP(lseg, idx);
1217 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1218 mirror, offset, length, status, opnum,
1219 GFP_NOIO);
1220 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1221 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1222 }
1223
1224 /* NFS_PROTO call done callback routines */
1225 static int ff_layout_read_done_cb(struct rpc_task *task,
1226 struct nfs_pgio_header *hdr)
1227 {
1228 int err;
1229
1230 trace_nfs4_pnfs_read(hdr, task->tk_status);
1231 if (task->tk_status < 0)
1232 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1233 hdr->args.offset, hdr->args.count,
1234 hdr->res.op_status, OP_READ,
1235 task->tk_status);
1236 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1237 hdr->ds_clp, hdr->lseg,
1238 hdr->pgio_mirror_idx);
1239
1240 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1241 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1242 switch (err) {
1243 case -NFS4ERR_RESET_TO_PNFS:
1244 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1245 hdr->pgio_mirror_idx + 1,
1246 &hdr->pgio_mirror_idx))
1247 goto out_eagain;
1248 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1249 return task->tk_status;
1250 case -NFS4ERR_RESET_TO_MDS:
1251 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1252 return task->tk_status;
1253 case -EAGAIN:
1254 goto out_eagain;
1255 }
1256
1257 return 0;
1258 out_eagain:
1259 rpc_restart_call_prepare(task);
1260 return -EAGAIN;
1261 }
1262
1263 static bool
1264 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1265 {
1266 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1267 }
1268
1269 /*
1270 * We reference the rpc_cred of the first WRITE that triggers the need for
1271 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1272 * rfc5661 is not clear about which credential should be used.
1273 *
1274 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1275 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1276 * we always send layoutcommit after DS writes.
1277 */
1278 static void
1279 ff_layout_set_layoutcommit(struct inode *inode,
1280 struct pnfs_layout_segment *lseg,
1281 loff_t end_offset)
1282 {
1283 if (!ff_layout_need_layoutcommit(lseg))
1284 return;
1285
1286 pnfs_set_layoutcommit(inode, lseg, end_offset);
1287 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1288 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1289 }
1290
1291 static bool
1292 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
1293 {
1294 /* No mirroring for now */
1295 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1296
1297 return ff_layout_test_devid_unavailable(node);
1298 }
1299
1300 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1301 struct nfs_pgio_header *hdr)
1302 {
1303 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1304 return;
1305 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1306 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1307 hdr->args.count,
1308 task->tk_start);
1309 }
1310
1311 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1312 struct nfs_pgio_header *hdr)
1313 {
1314 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1315 return;
1316 nfs4_ff_layout_stat_io_end_read(task,
1317 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1318 hdr->args.count,
1319 hdr->res.count);
1320 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1321 }
1322
1323 static int ff_layout_read_prepare_common(struct rpc_task *task,
1324 struct nfs_pgio_header *hdr)
1325 {
1326 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1327 rpc_exit(task, -EIO);
1328 return -EIO;
1329 }
1330 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1331 rpc_exit(task, -EHOSTDOWN);
1332 return -EAGAIN;
1333 }
1334
1335 ff_layout_read_record_layoutstats_start(task, hdr);
1336 return 0;
1337 }
1338
1339 /*
1340 * Call ops for the async read/write cases
1341 * In the case of dense layouts, the offset needs to be reset to its
1342 * original value.
1343 */
1344 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1345 {
1346 struct nfs_pgio_header *hdr = data;
1347
1348 if (ff_layout_read_prepare_common(task, hdr))
1349 return;
1350
1351 rpc_call_start(task);
1352 }
1353
1354 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1355 {
1356 struct nfs_pgio_header *hdr = data;
1357
1358 if (nfs4_setup_sequence(hdr->ds_clp,
1359 &hdr->args.seq_args,
1360 &hdr->res.seq_res,
1361 task))
1362 return;
1363
1364 ff_layout_read_prepare_common(task, hdr);
1365 }
1366
1367 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1368 {
1369 struct nfs_pgio_header *hdr = data;
1370
1371 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1372
1373 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1374 task->tk_status == 0) {
1375 nfs4_sequence_done(task, &hdr->res.seq_res);
1376 return;
1377 }
1378
1379 /* Note this may cause RPC to be resent */
1380 hdr->mds_ops->rpc_call_done(task, hdr);
1381 }
1382
1383 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1384 {
1385 struct nfs_pgio_header *hdr = data;
1386
1387 ff_layout_read_record_layoutstats_done(task, hdr);
1388 rpc_count_iostats_metrics(task,
1389 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1390 }
1391
1392 static void ff_layout_read_release(void *data)
1393 {
1394 struct nfs_pgio_header *hdr = data;
1395
1396 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1397 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1398 pnfs_read_resend_pnfs(hdr);
1399 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1400 ff_layout_reset_read(hdr);
1401 pnfs_generic_rw_release(data);
1402 }
1403
1404
1405 static int ff_layout_write_done_cb(struct rpc_task *task,
1406 struct nfs_pgio_header *hdr)
1407 {
1408 loff_t end_offs = 0;
1409 int err;
1410
1411 trace_nfs4_pnfs_write(hdr, task->tk_status);
1412 if (task->tk_status < 0)
1413 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1414 hdr->args.offset, hdr->args.count,
1415 hdr->res.op_status, OP_WRITE,
1416 task->tk_status);
1417 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1418 hdr->ds_clp, hdr->lseg,
1419 hdr->pgio_mirror_idx);
1420
1421 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1422 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1423 switch (err) {
1424 case -NFS4ERR_RESET_TO_PNFS:
1425 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1426 return task->tk_status;
1427 case -NFS4ERR_RESET_TO_MDS:
1428 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1429 return task->tk_status;
1430 case -EAGAIN:
1431 return -EAGAIN;
1432 }
1433
1434 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1435 hdr->res.verf->committed == NFS_DATA_SYNC)
1436 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1437
1438 /* Note: if the write is unstable, don't set end_offs until commit */
1439 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1440
1441 /* zero out fattr since we don't care DS attr at all */
1442 hdr->fattr.valid = 0;
1443 if (task->tk_status >= 0)
1444 nfs_writeback_update_inode(hdr);
1445
1446 return 0;
1447 }
1448
1449 static int ff_layout_commit_done_cb(struct rpc_task *task,
1450 struct nfs_commit_data *data)
1451 {
1452 int err;
1453
1454 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1455 if (task->tk_status < 0)
1456 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1457 data->args.offset, data->args.count,
1458 data->res.op_status, OP_COMMIT,
1459 task->tk_status);
1460 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1461 data->lseg, data->ds_commit_index);
1462
1463 switch (err) {
1464 case -NFS4ERR_RESET_TO_PNFS:
1465 pnfs_generic_prepare_to_resend_writes(data);
1466 return -EAGAIN;
1467 case -NFS4ERR_RESET_TO_MDS:
1468 pnfs_generic_prepare_to_resend_writes(data);
1469 return -EAGAIN;
1470 case -EAGAIN:
1471 rpc_restart_call_prepare(task);
1472 return -EAGAIN;
1473 }
1474
1475 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1476
1477 return 0;
1478 }
1479
1480 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1481 struct nfs_pgio_header *hdr)
1482 {
1483 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1484 return;
1485 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1486 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1487 hdr->args.count,
1488 task->tk_start);
1489 }
1490
1491 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1492 struct nfs_pgio_header *hdr)
1493 {
1494 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1495 return;
1496 nfs4_ff_layout_stat_io_end_write(task,
1497 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1498 hdr->args.count, hdr->res.count,
1499 hdr->res.verf->committed);
1500 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1501 }
1502
1503 static int ff_layout_write_prepare_common(struct rpc_task *task,
1504 struct nfs_pgio_header *hdr)
1505 {
1506 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1507 rpc_exit(task, -EIO);
1508 return -EIO;
1509 }
1510
1511 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1512 rpc_exit(task, -EHOSTDOWN);
1513 return -EAGAIN;
1514 }
1515
1516 ff_layout_write_record_layoutstats_start(task, hdr);
1517 return 0;
1518 }
1519
1520 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1521 {
1522 struct nfs_pgio_header *hdr = data;
1523
1524 if (ff_layout_write_prepare_common(task, hdr))
1525 return;
1526
1527 rpc_call_start(task);
1528 }
1529
1530 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1531 {
1532 struct nfs_pgio_header *hdr = data;
1533
1534 if (nfs4_setup_sequence(hdr->ds_clp,
1535 &hdr->args.seq_args,
1536 &hdr->res.seq_res,
1537 task))
1538 return;
1539
1540 ff_layout_write_prepare_common(task, hdr);
1541 }
1542
1543 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1544 {
1545 struct nfs_pgio_header *hdr = data;
1546
1547 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1548 task->tk_status == 0) {
1549 nfs4_sequence_done(task, &hdr->res.seq_res);
1550 return;
1551 }
1552
1553 /* Note this may cause RPC to be resent */
1554 hdr->mds_ops->rpc_call_done(task, hdr);
1555 }
1556
1557 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1558 {
1559 struct nfs_pgio_header *hdr = data;
1560
1561 ff_layout_write_record_layoutstats_done(task, hdr);
1562 rpc_count_iostats_metrics(task,
1563 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1564 }
1565
1566 static void ff_layout_write_release(void *data)
1567 {
1568 struct nfs_pgio_header *hdr = data;
1569
1570 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1571 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1572 ff_layout_reset_write(hdr, true);
1573 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1574 ff_layout_reset_write(hdr, false);
1575 pnfs_generic_rw_release(data);
1576 }
1577
1578 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1579 struct nfs_commit_data *cdata)
1580 {
1581 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1582 return;
1583 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1584 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1585 0, task->tk_start);
1586 }
1587
1588 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1589 struct nfs_commit_data *cdata)
1590 {
1591 struct nfs_page *req;
1592 __u64 count = 0;
1593
1594 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1595 return;
1596
1597 if (task->tk_status == 0) {
1598 list_for_each_entry(req, &cdata->pages, wb_list)
1599 count += req->wb_bytes;
1600 }
1601 nfs4_ff_layout_stat_io_end_write(task,
1602 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1603 count, count, NFS_FILE_SYNC);
1604 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1605 }
1606
1607 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1608 struct nfs_commit_data *cdata)
1609 {
1610 ff_layout_commit_record_layoutstats_start(task, cdata);
1611 }
1612
1613 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1614 {
1615 ff_layout_commit_prepare_common(task, data);
1616 rpc_call_start(task);
1617 }
1618
1619 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1620 {
1621 struct nfs_commit_data *wdata = data;
1622
1623 if (nfs4_setup_sequence(wdata->ds_clp,
1624 &wdata->args.seq_args,
1625 &wdata->res.seq_res,
1626 task))
1627 return;
1628 ff_layout_commit_prepare_common(task, data);
1629 }
1630
1631 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1632 {
1633 pnfs_generic_write_commit_done(task, data);
1634 }
1635
1636 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1637 {
1638 struct nfs_commit_data *cdata = data;
1639
1640 ff_layout_commit_record_layoutstats_done(task, cdata);
1641 rpc_count_iostats_metrics(task,
1642 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1643 }
1644
1645 static void ff_layout_commit_release(void *data)
1646 {
1647 struct nfs_commit_data *cdata = data;
1648
1649 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1650 pnfs_generic_commit_release(data);
1651 }
1652
1653 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1654 .rpc_call_prepare = ff_layout_read_prepare_v3,
1655 .rpc_call_done = ff_layout_read_call_done,
1656 .rpc_count_stats = ff_layout_read_count_stats,
1657 .rpc_release = ff_layout_read_release,
1658 };
1659
1660 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1661 .rpc_call_prepare = ff_layout_read_prepare_v4,
1662 .rpc_call_done = ff_layout_read_call_done,
1663 .rpc_count_stats = ff_layout_read_count_stats,
1664 .rpc_release = ff_layout_read_release,
1665 };
1666
1667 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1668 .rpc_call_prepare = ff_layout_write_prepare_v3,
1669 .rpc_call_done = ff_layout_write_call_done,
1670 .rpc_count_stats = ff_layout_write_count_stats,
1671 .rpc_release = ff_layout_write_release,
1672 };
1673
1674 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1675 .rpc_call_prepare = ff_layout_write_prepare_v4,
1676 .rpc_call_done = ff_layout_write_call_done,
1677 .rpc_count_stats = ff_layout_write_count_stats,
1678 .rpc_release = ff_layout_write_release,
1679 };
1680
1681 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1682 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1683 .rpc_call_done = ff_layout_commit_done,
1684 .rpc_count_stats = ff_layout_commit_count_stats,
1685 .rpc_release = ff_layout_commit_release,
1686 };
1687
1688 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1689 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1690 .rpc_call_done = ff_layout_commit_done,
1691 .rpc_count_stats = ff_layout_commit_count_stats,
1692 .rpc_release = ff_layout_commit_release,
1693 };
1694
1695 static enum pnfs_try_status
1696 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1697 {
1698 struct pnfs_layout_segment *lseg = hdr->lseg;
1699 struct nfs4_pnfs_ds *ds;
1700 struct rpc_clnt *ds_clnt;
1701 struct rpc_cred *ds_cred;
1702 loff_t offset = hdr->args.offset;
1703 u32 idx = hdr->pgio_mirror_idx;
1704 int vers;
1705 struct nfs_fh *fh;
1706
1707 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1708 __func__, hdr->inode->i_ino,
1709 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1710
1711 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1712 if (!ds)
1713 goto out_failed;
1714
1715 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1716 hdr->inode);
1717 if (IS_ERR(ds_clnt))
1718 goto out_failed;
1719
1720 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1721 if (!ds_cred)
1722 goto out_failed;
1723
1724 vers = nfs4_ff_layout_ds_version(lseg, idx);
1725
1726 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1727 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1728
1729 hdr->pgio_done_cb = ff_layout_read_done_cb;
1730 refcount_inc(&ds->ds_clp->cl_count);
1731 hdr->ds_clp = ds->ds_clp;
1732 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1733 if (fh)
1734 hdr->args.fh = fh;
1735
1736 if (!nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
1737 goto out_failed;
1738
1739 /*
1740 * Note that if we ever decide to split across DSes,
1741 * then we may need to handle dense-like offsets.
1742 */
1743 hdr->args.offset = offset;
1744 hdr->mds_offset = offset;
1745
1746 /* Perform an asynchronous read to ds */
1747 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1748 vers == 3 ? &ff_layout_read_call_ops_v3 :
1749 &ff_layout_read_call_ops_v4,
1750 0, RPC_TASK_SOFTCONN);
1751 put_rpccred(ds_cred);
1752 return PNFS_ATTEMPTED;
1753
1754 out_failed:
1755 if (ff_layout_avoid_mds_available_ds(lseg))
1756 return PNFS_TRY_AGAIN;
1757 return PNFS_NOT_ATTEMPTED;
1758 }
1759
1760 /* Perform async writes. */
1761 static enum pnfs_try_status
1762 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1763 {
1764 struct pnfs_layout_segment *lseg = hdr->lseg;
1765 struct nfs4_pnfs_ds *ds;
1766 struct rpc_clnt *ds_clnt;
1767 struct rpc_cred *ds_cred;
1768 loff_t offset = hdr->args.offset;
1769 int vers;
1770 struct nfs_fh *fh;
1771 int idx = hdr->pgio_mirror_idx;
1772
1773 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1774 if (!ds)
1775 goto out_failed;
1776
1777 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1778 hdr->inode);
1779 if (IS_ERR(ds_clnt))
1780 goto out_failed;
1781
1782 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1783 if (!ds_cred)
1784 goto out_failed;
1785
1786 vers = nfs4_ff_layout_ds_version(lseg, idx);
1787
1788 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1789 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1790 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1791 vers);
1792
1793 hdr->pgio_done_cb = ff_layout_write_done_cb;
1794 refcount_inc(&ds->ds_clp->cl_count);
1795 hdr->ds_clp = ds->ds_clp;
1796 hdr->ds_commit_idx = idx;
1797 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1798 if (fh)
1799 hdr->args.fh = fh;
1800
1801 if (!nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
1802 goto out_failed;
1803
1804 /*
1805 * Note that if we ever decide to split across DSes,
1806 * then we may need to handle dense-like offsets.
1807 */
1808 hdr->args.offset = offset;
1809
1810 /* Perform an asynchronous write */
1811 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1812 vers == 3 ? &ff_layout_write_call_ops_v3 :
1813 &ff_layout_write_call_ops_v4,
1814 sync, RPC_TASK_SOFTCONN);
1815 put_rpccred(ds_cred);
1816 return PNFS_ATTEMPTED;
1817
1818 out_failed:
1819 if (ff_layout_avoid_mds_available_ds(lseg))
1820 return PNFS_TRY_AGAIN;
1821 return PNFS_NOT_ATTEMPTED;
1822 }
1823
1824 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1825 {
1826 return i;
1827 }
1828
1829 static struct nfs_fh *
1830 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1831 {
1832 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1833
1834 /* FIXME: Assume that there is only one NFS version available
1835 * for the DS.
1836 */
1837 return &flseg->mirror_array[i]->fh_versions[0];
1838 }
1839
1840 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1841 {
1842 struct pnfs_layout_segment *lseg = data->lseg;
1843 struct nfs4_pnfs_ds *ds;
1844 struct rpc_clnt *ds_clnt;
1845 struct rpc_cred *ds_cred;
1846 u32 idx;
1847 int vers, ret;
1848 struct nfs_fh *fh;
1849
1850 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1851 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1852 goto out_err;
1853
1854 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1855 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1856 if (!ds)
1857 goto out_err;
1858
1859 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1860 data->inode);
1861 if (IS_ERR(ds_clnt))
1862 goto out_err;
1863
1864 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1865 if (!ds_cred)
1866 goto out_err;
1867
1868 vers = nfs4_ff_layout_ds_version(lseg, idx);
1869
1870 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1871 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1872 vers);
1873 data->commit_done_cb = ff_layout_commit_done_cb;
1874 data->cred = ds_cred;
1875 refcount_inc(&ds->ds_clp->cl_count);
1876 data->ds_clp = ds->ds_clp;
1877 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1878 if (fh)
1879 data->args.fh = fh;
1880
1881 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1882 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1883 &ff_layout_commit_call_ops_v4,
1884 how, RPC_TASK_SOFTCONN);
1885 put_rpccred(ds_cred);
1886 return ret;
1887 out_err:
1888 pnfs_generic_prepare_to_resend_writes(data);
1889 pnfs_generic_commit_release(data);
1890 return -EAGAIN;
1891 }
1892
1893 static int
1894 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1895 int how, struct nfs_commit_info *cinfo)
1896 {
1897 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1898 ff_layout_initiate_commit);
1899 }
1900
1901 static struct pnfs_ds_commit_info *
1902 ff_layout_get_ds_info(struct inode *inode)
1903 {
1904 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1905
1906 if (layout == NULL)
1907 return NULL;
1908
1909 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1910 }
1911
1912 static void
1913 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1914 {
1915 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1916 id_node));
1917 }
1918
1919 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1920 const struct nfs4_layoutreturn_args *args,
1921 const struct nfs4_flexfile_layoutreturn_args *ff_args)
1922 {
1923 __be32 *start;
1924
1925 start = xdr_reserve_space(xdr, 4);
1926 if (unlikely(!start))
1927 return -E2BIG;
1928
1929 *start = cpu_to_be32(ff_args->num_errors);
1930 /* This assume we always return _ALL_ layouts */
1931 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
1932 }
1933
1934 static void
1935 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1936 {
1937 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
1938 }
1939
1940 static void
1941 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1942 const nfs4_stateid *stateid,
1943 const struct nfs42_layoutstat_devinfo *devinfo)
1944 {
1945 __be32 *p;
1946
1947 p = xdr_reserve_space(xdr, 8 + 8);
1948 p = xdr_encode_hyper(p, devinfo->offset);
1949 p = xdr_encode_hyper(p, devinfo->length);
1950 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1951 p = xdr_reserve_space(xdr, 4*8);
1952 p = xdr_encode_hyper(p, devinfo->read_count);
1953 p = xdr_encode_hyper(p, devinfo->read_bytes);
1954 p = xdr_encode_hyper(p, devinfo->write_count);
1955 p = xdr_encode_hyper(p, devinfo->write_bytes);
1956 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1957 }
1958
1959 static void
1960 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1961 const nfs4_stateid *stateid,
1962 const struct nfs42_layoutstat_devinfo *devinfo)
1963 {
1964 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1965 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1966 devinfo->ld_private.data);
1967 }
1968
1969 /* report nothing for now */
1970 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
1971 const struct nfs4_layoutreturn_args *args,
1972 struct nfs4_flexfile_layoutreturn_args *ff_args)
1973 {
1974 __be32 *p;
1975 int i;
1976
1977 p = xdr_reserve_space(xdr, 4);
1978 *p = cpu_to_be32(ff_args->num_dev);
1979 for (i = 0; i < ff_args->num_dev; i++)
1980 ff_layout_encode_ff_iostat(xdr,
1981 &args->layout->plh_stateid,
1982 &ff_args->devinfo[i]);
1983 }
1984
1985 static void
1986 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
1987 unsigned int num_entries)
1988 {
1989 unsigned int i;
1990
1991 for (i = 0; i < num_entries; i++) {
1992 if (!devinfo[i].ld_private.ops)
1993 continue;
1994 if (!devinfo[i].ld_private.ops->free)
1995 continue;
1996 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
1997 }
1998 }
1999
2000 static struct nfs4_deviceid_node *
2001 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2002 struct pnfs_device *pdev, gfp_t gfp_flags)
2003 {
2004 struct nfs4_ff_layout_ds *dsaddr;
2005
2006 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2007 if (!dsaddr)
2008 return NULL;
2009 return &dsaddr->id_node;
2010 }
2011
2012 static void
2013 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2014 const void *voidargs,
2015 const struct nfs4_xdr_opaque_data *ff_opaque)
2016 {
2017 const struct nfs4_layoutreturn_args *args = voidargs;
2018 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2019 struct xdr_buf tmp_buf = {
2020 .head = {
2021 [0] = {
2022 .iov_base = page_address(ff_args->pages[0]),
2023 },
2024 },
2025 .buflen = PAGE_SIZE,
2026 };
2027 struct xdr_stream tmp_xdr;
2028 __be32 *start;
2029
2030 dprintk("%s: Begin\n", __func__);
2031
2032 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2033
2034 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2035 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2036
2037 start = xdr_reserve_space(xdr, 4);
2038 *start = cpu_to_be32(tmp_buf.len);
2039 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2040
2041 dprintk("%s: Return\n", __func__);
2042 }
2043
2044 static void
2045 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2046 {
2047 struct nfs4_flexfile_layoutreturn_args *ff_args;
2048
2049 if (!args->data)
2050 return;
2051 ff_args = args->data;
2052 args->data = NULL;
2053
2054 ff_layout_free_ds_ioerr(&ff_args->errors);
2055 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2056
2057 put_page(ff_args->pages[0]);
2058 kfree(ff_args);
2059 }
2060
2061 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2062 .encode = ff_layout_encode_layoutreturn,
2063 .free = ff_layout_free_layoutreturn,
2064 };
2065
2066 static int
2067 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2068 {
2069 struct nfs4_flexfile_layoutreturn_args *ff_args;
2070 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2071
2072 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2073 if (!ff_args)
2074 goto out_nomem;
2075 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2076 if (!ff_args->pages[0])
2077 goto out_nomem_free;
2078
2079 INIT_LIST_HEAD(&ff_args->errors);
2080 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2081 &args->range, &ff_args->errors,
2082 FF_LAYOUTRETURN_MAXERR);
2083
2084 spin_lock(&args->inode->i_lock);
2085 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2086 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2087 spin_unlock(&args->inode->i_lock);
2088
2089 args->ld_private->ops = &layoutreturn_ops;
2090 args->ld_private->data = ff_args;
2091 return 0;
2092 out_nomem_free:
2093 kfree(ff_args);
2094 out_nomem:
2095 return -ENOMEM;
2096 }
2097
2098 static int
2099 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2100 {
2101 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2102
2103 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2104 }
2105
2106 static size_t
2107 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2108 const int buflen)
2109 {
2110 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2111 const struct in6_addr *addr = &sin6->sin6_addr;
2112
2113 /*
2114 * RFC 4291, Section 2.2.2
2115 *
2116 * Shorthanded ANY address
2117 */
2118 if (ipv6_addr_any(addr))
2119 return snprintf(buf, buflen, "::");
2120
2121 /*
2122 * RFC 4291, Section 2.2.2
2123 *
2124 * Shorthanded loopback address
2125 */
2126 if (ipv6_addr_loopback(addr))
2127 return snprintf(buf, buflen, "::1");
2128
2129 /*
2130 * RFC 4291, Section 2.2.3
2131 *
2132 * Special presentation address format for mapped v4
2133 * addresses.
2134 */
2135 if (ipv6_addr_v4mapped(addr))
2136 return snprintf(buf, buflen, "::ffff:%pI4",
2137 &addr->s6_addr32[3]);
2138
2139 /*
2140 * RFC 4291, Section 2.2.1
2141 */
2142 return snprintf(buf, buflen, "%pI6c", addr);
2143 }
2144
2145 /* Derived from rpc_sockaddr2uaddr */
2146 static void
2147 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2148 {
2149 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2150 char portbuf[RPCBIND_MAXUADDRPLEN];
2151 char addrbuf[RPCBIND_MAXUADDRLEN];
2152 char *netid;
2153 unsigned short port;
2154 int len, netid_len;
2155 __be32 *p;
2156
2157 switch (sap->sa_family) {
2158 case AF_INET:
2159 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2160 return;
2161 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2162 netid = "tcp";
2163 netid_len = 3;
2164 break;
2165 case AF_INET6:
2166 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2167 return;
2168 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2169 netid = "tcp6";
2170 netid_len = 4;
2171 break;
2172 default:
2173 /* we only support tcp and tcp6 */
2174 WARN_ON_ONCE(1);
2175 return;
2176 }
2177
2178 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2179 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2180
2181 p = xdr_reserve_space(xdr, 4 + netid_len);
2182 xdr_encode_opaque(p, netid, netid_len);
2183
2184 p = xdr_reserve_space(xdr, 4 + len);
2185 xdr_encode_opaque(p, addrbuf, len);
2186 }
2187
2188 static void
2189 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2190 ktime_t t)
2191 {
2192 struct timespec64 ts;
2193 __be32 *p;
2194
2195 p = xdr_reserve_space(xdr, 12);
2196 ts = ktime_to_timespec64(t);
2197 p = xdr_encode_hyper(p, ts.tv_sec);
2198 *p++ = cpu_to_be32(ts.tv_nsec);
2199 }
2200
2201 static void
2202 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2203 struct nfs4_ff_io_stat *stat)
2204 {
2205 __be32 *p;
2206
2207 p = xdr_reserve_space(xdr, 5 * 8);
2208 p = xdr_encode_hyper(p, stat->ops_requested);
2209 p = xdr_encode_hyper(p, stat->bytes_requested);
2210 p = xdr_encode_hyper(p, stat->ops_completed);
2211 p = xdr_encode_hyper(p, stat->bytes_completed);
2212 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2213 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2214 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2215 }
2216
2217 static void
2218 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2219 const struct nfs42_layoutstat_devinfo *devinfo,
2220 struct nfs4_ff_layout_mirror *mirror)
2221 {
2222 struct nfs4_pnfs_ds_addr *da;
2223 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2224 struct nfs_fh *fh = &mirror->fh_versions[0];
2225 __be32 *p;
2226
2227 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2228 dprintk("%s: DS %s: encoding address %s\n",
2229 __func__, ds->ds_remotestr, da->da_remotestr);
2230 /* netaddr4 */
2231 ff_layout_encode_netaddr(xdr, da);
2232 /* nfs_fh4 */
2233 p = xdr_reserve_space(xdr, 4 + fh->size);
2234 xdr_encode_opaque(p, fh->data, fh->size);
2235 /* ff_io_latency4 read */
2236 spin_lock(&mirror->lock);
2237 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2238 /* ff_io_latency4 write */
2239 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2240 spin_unlock(&mirror->lock);
2241 /* nfstime4 */
2242 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2243 /* bool */
2244 p = xdr_reserve_space(xdr, 4);
2245 *p = cpu_to_be32(false);
2246 }
2247
2248 static void
2249 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2250 const struct nfs4_xdr_opaque_data *opaque)
2251 {
2252 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2253 struct nfs42_layoutstat_devinfo, ld_private);
2254 __be32 *start;
2255
2256 /* layoutupdate length */
2257 start = xdr_reserve_space(xdr, 4);
2258 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2259
2260 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2261 }
2262
2263 static void
2264 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2265 {
2266 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2267
2268 ff_layout_put_mirror(mirror);
2269 }
2270
2271 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2272 .encode = ff_layout_encode_layoutstats,
2273 .free = ff_layout_free_layoutstats,
2274 };
2275
2276 static int
2277 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2278 struct nfs42_layoutstat_devinfo *devinfo,
2279 int dev_limit)
2280 {
2281 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2282 struct nfs4_ff_layout_mirror *mirror;
2283 struct nfs4_deviceid_node *dev;
2284 int i = 0;
2285
2286 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2287 if (i >= dev_limit)
2288 break;
2289 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2290 continue;
2291 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2292 continue;
2293 /* mirror refcount put in cleanup_layoutstats */
2294 if (!refcount_inc_not_zero(&mirror->ref))
2295 continue;
2296 dev = &mirror->mirror_ds->id_node;
2297 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2298 devinfo->offset = 0;
2299 devinfo->length = NFS4_MAX_UINT64;
2300 spin_lock(&mirror->lock);
2301 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2302 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2303 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2304 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2305 spin_unlock(&mirror->lock);
2306 devinfo->layout_type = LAYOUT_FLEX_FILES;
2307 devinfo->ld_private.ops = &layoutstat_ops;
2308 devinfo->ld_private.data = mirror;
2309
2310 devinfo++;
2311 i++;
2312 }
2313 return i;
2314 }
2315
2316 static int
2317 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2318 {
2319 struct nfs4_flexfile_layout *ff_layout;
2320 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2321
2322 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2323 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2324 if (!args->devinfo)
2325 return -ENOMEM;
2326
2327 spin_lock(&args->inode->i_lock);
2328 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2329 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2330 &args->devinfo[0], dev_count);
2331 spin_unlock(&args->inode->i_lock);
2332 if (!args->num_dev) {
2333 kfree(args->devinfo);
2334 args->devinfo = NULL;
2335 return -ENOENT;
2336 }
2337
2338 return 0;
2339 }
2340
2341 static int
2342 ff_layout_set_layoutdriver(struct nfs_server *server,
2343 const struct nfs_fh *dummy)
2344 {
2345 #if IS_ENABLED(CONFIG_NFS_V4_2)
2346 server->caps |= NFS_CAP_LAYOUTSTATS;
2347 #endif
2348 return 0;
2349 }
2350
2351 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2352 .id = LAYOUT_FLEX_FILES,
2353 .name = "LAYOUT_FLEX_FILES",
2354 .owner = THIS_MODULE,
2355 .flags = PNFS_LAYOUTGET_ON_OPEN,
2356 .max_layoutget_response = 4096, /* 1 page or so... */
2357 .set_layoutdriver = ff_layout_set_layoutdriver,
2358 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2359 .free_layout_hdr = ff_layout_free_layout_hdr,
2360 .alloc_lseg = ff_layout_alloc_lseg,
2361 .free_lseg = ff_layout_free_lseg,
2362 .add_lseg = ff_layout_add_lseg,
2363 .pg_read_ops = &ff_layout_pg_read_ops,
2364 .pg_write_ops = &ff_layout_pg_write_ops,
2365 .get_ds_info = ff_layout_get_ds_info,
2366 .free_deviceid_node = ff_layout_free_deviceid_node,
2367 .mark_request_commit = pnfs_layout_mark_request_commit,
2368 .clear_request_commit = pnfs_generic_clear_request_commit,
2369 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2370 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2371 .commit_pagelist = ff_layout_commit_pagelist,
2372 .read_pagelist = ff_layout_read_pagelist,
2373 .write_pagelist = ff_layout_write_pagelist,
2374 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2375 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2376 .sync = pnfs_nfs_generic_sync,
2377 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2378 };
2379
2380 static int __init nfs4flexfilelayout_init(void)
2381 {
2382 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2383 __func__);
2384 if (!ff_zero_group) {
2385 ff_zero_group = groups_alloc(0);
2386 if (!ff_zero_group)
2387 return -ENOMEM;
2388 }
2389 return pnfs_register_layoutdriver(&flexfilelayout_type);
2390 }
2391
2392 static void __exit nfs4flexfilelayout_exit(void)
2393 {
2394 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2395 __func__);
2396 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2397 if (ff_zero_group) {
2398 put_group_info(ff_zero_group);
2399 ff_zero_group = NULL;
2400 }
2401 }
2402
2403 MODULE_ALIAS("nfs-layouttype4-4");
2404
2405 MODULE_LICENSE("GPL");
2406 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2407
2408 module_init(nfs4flexfilelayout_init);
2409 module_exit(nfs4flexfilelayout_exit);
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