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Merge tag 'for-linus-20170825' of git://git.infradead.org/linux-mtd
[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 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 kzalloc(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 retry_strict:
816 pnfs_put_lseg(pgio->pg_lseg);
817 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
818 req->wb_context,
819 0,
820 NFS4_MAX_UINT64,
821 IOMODE_READ,
822 strict_iomode,
823 GFP_KERNEL);
824 if (IS_ERR(pgio->pg_lseg)) {
825 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
826 pgio->pg_lseg = NULL;
827 }
828
829 /* If we don't have checking, do get a IOMODE_RW
830 * segment, and the server wants to avoid READs
831 * there, then retry!
832 */
833 if (pgio->pg_lseg && !strict_iomode &&
834 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
835 strict_iomode = true;
836 goto retry_strict;
837 }
838 }
839
840 static void
841 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
842 struct nfs_page *req)
843 {
844 struct nfs_pgio_mirror *pgm;
845 struct nfs4_ff_layout_mirror *mirror;
846 struct nfs4_pnfs_ds *ds;
847 int ds_idx;
848
849 retry:
850 pnfs_generic_pg_check_layout(pgio);
851 /* Use full layout for now */
852 if (!pgio->pg_lseg)
853 ff_layout_pg_get_read(pgio, req, false);
854 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
855 ff_layout_pg_get_read(pgio, req, true);
856
857 /* If no lseg, fall back to read through mds */
858 if (pgio->pg_lseg == NULL)
859 goto out_mds;
860
861 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
862 if (!ds) {
863 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
864 goto out_mds;
865 pnfs_put_lseg(pgio->pg_lseg);
866 pgio->pg_lseg = NULL;
867 /* Sleep for 1 second before retrying */
868 ssleep(1);
869 goto retry;
870 }
871
872 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
873
874 pgio->pg_mirror_idx = ds_idx;
875
876 /* read always uses only one mirror - idx 0 for pgio layer */
877 pgm = &pgio->pg_mirrors[0];
878 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
879
880 return;
881 out_mds:
882 pnfs_put_lseg(pgio->pg_lseg);
883 pgio->pg_lseg = NULL;
884 nfs_pageio_reset_read_mds(pgio);
885 }
886
887 static void
888 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
889 struct nfs_page *req)
890 {
891 struct nfs4_ff_layout_mirror *mirror;
892 struct nfs_pgio_mirror *pgm;
893 struct nfs_commit_info cinfo;
894 struct nfs4_pnfs_ds *ds;
895 int i;
896 int status;
897
898 retry:
899 pnfs_generic_pg_check_layout(pgio);
900 if (!pgio->pg_lseg) {
901 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
902 req->wb_context,
903 0,
904 NFS4_MAX_UINT64,
905 IOMODE_RW,
906 false,
907 GFP_NOFS);
908 if (IS_ERR(pgio->pg_lseg)) {
909 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
910 pgio->pg_lseg = NULL;
911 return;
912 }
913 }
914 /* If no lseg, fall back to write through mds */
915 if (pgio->pg_lseg == NULL)
916 goto out_mds;
917
918 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
919 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
920 if (status < 0)
921 goto out_mds;
922
923 /* Use a direct mapping of ds_idx to pgio mirror_idx */
924 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
925 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
926 goto out_mds;
927
928 for (i = 0; i < pgio->pg_mirror_count; i++) {
929 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
930 if (!ds) {
931 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
932 goto out_mds;
933 pnfs_put_lseg(pgio->pg_lseg);
934 pgio->pg_lseg = NULL;
935 /* Sleep for 1 second before retrying */
936 ssleep(1);
937 goto retry;
938 }
939 pgm = &pgio->pg_mirrors[i];
940 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
941 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
942 }
943
944 return;
945
946 out_mds:
947 pnfs_put_lseg(pgio->pg_lseg);
948 pgio->pg_lseg = NULL;
949 nfs_pageio_reset_write_mds(pgio);
950 }
951
952 static unsigned int
953 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
954 struct nfs_page *req)
955 {
956 if (!pgio->pg_lseg) {
957 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
958 req->wb_context,
959 0,
960 NFS4_MAX_UINT64,
961 IOMODE_RW,
962 false,
963 GFP_NOFS);
964 if (IS_ERR(pgio->pg_lseg)) {
965 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
966 pgio->pg_lseg = NULL;
967 goto out;
968 }
969 }
970 if (pgio->pg_lseg)
971 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
972
973 /* no lseg means that pnfs is not in use, so no mirroring here */
974 nfs_pageio_reset_write_mds(pgio);
975 out:
976 return 1;
977 }
978
979 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
980 .pg_init = ff_layout_pg_init_read,
981 .pg_test = pnfs_generic_pg_test,
982 .pg_doio = pnfs_generic_pg_readpages,
983 .pg_cleanup = pnfs_generic_pg_cleanup,
984 };
985
986 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
987 .pg_init = ff_layout_pg_init_write,
988 .pg_test = pnfs_generic_pg_test,
989 .pg_doio = pnfs_generic_pg_writepages,
990 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
991 .pg_cleanup = pnfs_generic_pg_cleanup,
992 };
993
994 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
995 {
996 struct rpc_task *task = &hdr->task;
997
998 pnfs_layoutcommit_inode(hdr->inode, false);
999
1000 if (retry_pnfs) {
1001 dprintk("%s Reset task %5u for i/o through pNFS "
1002 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1003 hdr->task.tk_pid,
1004 hdr->inode->i_sb->s_id,
1005 (unsigned long long)NFS_FILEID(hdr->inode),
1006 hdr->args.count,
1007 (unsigned long long)hdr->args.offset);
1008
1009 hdr->completion_ops->reschedule_io(hdr);
1010 return;
1011 }
1012
1013 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1014 dprintk("%s Reset task %5u for i/o through MDS "
1015 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1016 hdr->task.tk_pid,
1017 hdr->inode->i_sb->s_id,
1018 (unsigned long long)NFS_FILEID(hdr->inode),
1019 hdr->args.count,
1020 (unsigned long long)hdr->args.offset);
1021
1022 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1023 }
1024 }
1025
1026 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1027 {
1028 struct rpc_task *task = &hdr->task;
1029
1030 pnfs_layoutcommit_inode(hdr->inode, false);
1031
1032 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1033 dprintk("%s Reset task %5u for i/o through MDS "
1034 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1035 hdr->task.tk_pid,
1036 hdr->inode->i_sb->s_id,
1037 (unsigned long long)NFS_FILEID(hdr->inode),
1038 hdr->args.count,
1039 (unsigned long long)hdr->args.offset);
1040
1041 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1042 }
1043 }
1044
1045 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1046 struct nfs4_state *state,
1047 struct nfs_client *clp,
1048 struct pnfs_layout_segment *lseg,
1049 int idx)
1050 {
1051 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1052 struct inode *inode = lo->plh_inode;
1053 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1054 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1055
1056 switch (task->tk_status) {
1057 case -NFS4ERR_BADSESSION:
1058 case -NFS4ERR_BADSLOT:
1059 case -NFS4ERR_BAD_HIGH_SLOT:
1060 case -NFS4ERR_DEADSESSION:
1061 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1062 case -NFS4ERR_SEQ_FALSE_RETRY:
1063 case -NFS4ERR_SEQ_MISORDERED:
1064 dprintk("%s ERROR %d, Reset session. Exchangeid "
1065 "flags 0x%x\n", __func__, task->tk_status,
1066 clp->cl_exchange_flags);
1067 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1068 break;
1069 case -NFS4ERR_DELAY:
1070 case -NFS4ERR_GRACE:
1071 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1072 break;
1073 case -NFS4ERR_RETRY_UNCACHED_REP:
1074 break;
1075 /* Invalidate Layout errors */
1076 case -NFS4ERR_PNFS_NO_LAYOUT:
1077 case -ESTALE: /* mapped NFS4ERR_STALE */
1078 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1079 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1080 case -NFS4ERR_FHEXPIRED:
1081 case -NFS4ERR_WRONG_TYPE:
1082 dprintk("%s Invalid layout error %d\n", __func__,
1083 task->tk_status);
1084 /*
1085 * Destroy layout so new i/o will get a new layout.
1086 * Layout will not be destroyed until all current lseg
1087 * references are put. Mark layout as invalid to resend failed
1088 * i/o and all i/o waiting on the slot table to the MDS until
1089 * layout is destroyed and a new valid layout is obtained.
1090 */
1091 pnfs_destroy_layout(NFS_I(inode));
1092 rpc_wake_up(&tbl->slot_tbl_waitq);
1093 goto reset;
1094 /* RPC connection errors */
1095 case -ECONNREFUSED:
1096 case -EHOSTDOWN:
1097 case -EHOSTUNREACH:
1098 case -ENETUNREACH:
1099 case -EIO:
1100 case -ETIMEDOUT:
1101 case -EPIPE:
1102 dprintk("%s DS connection error %d\n", __func__,
1103 task->tk_status);
1104 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1105 &devid->deviceid);
1106 rpc_wake_up(&tbl->slot_tbl_waitq);
1107 /* fall through */
1108 default:
1109 if (ff_layout_avoid_mds_available_ds(lseg))
1110 return -NFS4ERR_RESET_TO_PNFS;
1111 reset:
1112 dprintk("%s Retry through MDS. Error %d\n", __func__,
1113 task->tk_status);
1114 return -NFS4ERR_RESET_TO_MDS;
1115 }
1116 task->tk_status = 0;
1117 return -EAGAIN;
1118 }
1119
1120 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1121 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1122 struct pnfs_layout_segment *lseg,
1123 int idx)
1124 {
1125 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1126
1127 switch (task->tk_status) {
1128 /* File access problems. Don't mark the device as unavailable */
1129 case -EACCES:
1130 case -ESTALE:
1131 case -EISDIR:
1132 case -EBADHANDLE:
1133 case -ELOOP:
1134 case -ENOSPC:
1135 break;
1136 case -EJUKEBOX:
1137 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1138 goto out_retry;
1139 default:
1140 dprintk("%s DS connection error %d\n", __func__,
1141 task->tk_status);
1142 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1143 &devid->deviceid);
1144 }
1145 /* FIXME: Need to prevent infinite looping here. */
1146 return -NFS4ERR_RESET_TO_PNFS;
1147 out_retry:
1148 task->tk_status = 0;
1149 rpc_restart_call_prepare(task);
1150 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1151 return -EAGAIN;
1152 }
1153
1154 static int ff_layout_async_handle_error(struct rpc_task *task,
1155 struct nfs4_state *state,
1156 struct nfs_client *clp,
1157 struct pnfs_layout_segment *lseg,
1158 int idx)
1159 {
1160 int vers = clp->cl_nfs_mod->rpc_vers->number;
1161
1162 if (task->tk_status >= 0)
1163 return 0;
1164
1165 /* Handle the case of an invalid layout segment */
1166 if (!pnfs_is_valid_lseg(lseg))
1167 return -NFS4ERR_RESET_TO_PNFS;
1168
1169 switch (vers) {
1170 case 3:
1171 return ff_layout_async_handle_error_v3(task, lseg, idx);
1172 case 4:
1173 return ff_layout_async_handle_error_v4(task, state, clp,
1174 lseg, idx);
1175 default:
1176 /* should never happen */
1177 WARN_ON_ONCE(1);
1178 return 0;
1179 }
1180 }
1181
1182 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1183 int idx, u64 offset, u64 length,
1184 u32 status, int opnum, int error)
1185 {
1186 struct nfs4_ff_layout_mirror *mirror;
1187 int err;
1188
1189 if (status == 0) {
1190 switch (error) {
1191 case -ETIMEDOUT:
1192 case -EPFNOSUPPORT:
1193 case -EPROTONOSUPPORT:
1194 case -EOPNOTSUPP:
1195 case -ECONNREFUSED:
1196 case -ECONNRESET:
1197 case -EHOSTDOWN:
1198 case -EHOSTUNREACH:
1199 case -ENETUNREACH:
1200 case -EADDRINUSE:
1201 case -ENOBUFS:
1202 case -EPIPE:
1203 case -EPERM:
1204 status = NFS4ERR_NXIO;
1205 break;
1206 case -EACCES:
1207 status = NFS4ERR_ACCESS;
1208 break;
1209 default:
1210 return;
1211 }
1212 }
1213
1214 switch (status) {
1215 case NFS4ERR_DELAY:
1216 case NFS4ERR_GRACE:
1217 return;
1218 default:
1219 break;
1220 }
1221
1222 mirror = FF_LAYOUT_COMP(lseg, idx);
1223 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1224 mirror, offset, length, status, opnum,
1225 GFP_NOIO);
1226 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1227 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1228 }
1229
1230 /* NFS_PROTO call done callback routines */
1231 static int ff_layout_read_done_cb(struct rpc_task *task,
1232 struct nfs_pgio_header *hdr)
1233 {
1234 int err;
1235
1236 trace_nfs4_pnfs_read(hdr, task->tk_status);
1237 if (task->tk_status < 0)
1238 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1239 hdr->args.offset, hdr->args.count,
1240 hdr->res.op_status, OP_READ,
1241 task->tk_status);
1242 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1243 hdr->ds_clp, hdr->lseg,
1244 hdr->pgio_mirror_idx);
1245
1246 switch (err) {
1247 case -NFS4ERR_RESET_TO_PNFS:
1248 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1249 hdr->pgio_mirror_idx + 1,
1250 &hdr->pgio_mirror_idx))
1251 goto out_eagain;
1252 ff_layout_read_record_layoutstats_done(task, hdr);
1253 pnfs_read_resend_pnfs(hdr);
1254 return task->tk_status;
1255 case -NFS4ERR_RESET_TO_MDS:
1256 ff_layout_reset_read(hdr);
1257 return task->tk_status;
1258 case -EAGAIN:
1259 goto out_eagain;
1260 }
1261
1262 return 0;
1263 out_eagain:
1264 rpc_restart_call_prepare(task);
1265 return -EAGAIN;
1266 }
1267
1268 static bool
1269 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1270 {
1271 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1272 }
1273
1274 /*
1275 * We reference the rpc_cred of the first WRITE that triggers the need for
1276 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1277 * rfc5661 is not clear about which credential should be used.
1278 *
1279 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1280 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1281 * we always send layoutcommit after DS writes.
1282 */
1283 static void
1284 ff_layout_set_layoutcommit(struct inode *inode,
1285 struct pnfs_layout_segment *lseg,
1286 loff_t end_offset)
1287 {
1288 if (!ff_layout_need_layoutcommit(lseg))
1289 return;
1290
1291 pnfs_set_layoutcommit(inode, lseg, end_offset);
1292 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1293 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1294 }
1295
1296 static bool
1297 ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
1298 {
1299 /* No mirroring for now */
1300 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1301
1302 return ff_layout_test_devid_unavailable(node);
1303 }
1304
1305 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1306 struct nfs_pgio_header *hdr)
1307 {
1308 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1309 return;
1310 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1311 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1312 hdr->args.count,
1313 task->tk_start);
1314 }
1315
1316 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1317 struct nfs_pgio_header *hdr)
1318 {
1319 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1320 return;
1321 nfs4_ff_layout_stat_io_end_read(task,
1322 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1323 hdr->args.count,
1324 hdr->res.count);
1325 }
1326
1327 static int ff_layout_read_prepare_common(struct rpc_task *task,
1328 struct nfs_pgio_header *hdr)
1329 {
1330 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1331 rpc_exit(task, -EIO);
1332 return -EIO;
1333 }
1334 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1335 rpc_exit(task, -EHOSTDOWN);
1336 return -EAGAIN;
1337 }
1338
1339 ff_layout_read_record_layoutstats_start(task, hdr);
1340 return 0;
1341 }
1342
1343 /*
1344 * Call ops for the async read/write cases
1345 * In the case of dense layouts, the offset needs to be reset to its
1346 * original value.
1347 */
1348 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1349 {
1350 struct nfs_pgio_header *hdr = data;
1351
1352 if (ff_layout_read_prepare_common(task, hdr))
1353 return;
1354
1355 rpc_call_start(task);
1356 }
1357
1358 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1359 {
1360 struct nfs_pgio_header *hdr = data;
1361
1362 if (nfs4_setup_sequence(hdr->ds_clp,
1363 &hdr->args.seq_args,
1364 &hdr->res.seq_res,
1365 task))
1366 return;
1367
1368 if (ff_layout_read_prepare_common(task, hdr))
1369 return;
1370
1371 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1372 hdr->args.lock_context, FMODE_READ) == -EIO)
1373 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1374 }
1375
1376 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1377 {
1378 struct nfs_pgio_header *hdr = data;
1379
1380 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1381
1382 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1383 task->tk_status == 0) {
1384 nfs4_sequence_done(task, &hdr->res.seq_res);
1385 return;
1386 }
1387
1388 /* Note this may cause RPC to be resent */
1389 hdr->mds_ops->rpc_call_done(task, hdr);
1390 }
1391
1392 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1393 {
1394 struct nfs_pgio_header *hdr = data;
1395
1396 ff_layout_read_record_layoutstats_done(task, hdr);
1397 rpc_count_iostats_metrics(task,
1398 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1399 }
1400
1401 static void ff_layout_read_release(void *data)
1402 {
1403 struct nfs_pgio_header *hdr = data;
1404
1405 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1406 pnfs_generic_rw_release(data);
1407 }
1408
1409
1410 static int ff_layout_write_done_cb(struct rpc_task *task,
1411 struct nfs_pgio_header *hdr)
1412 {
1413 loff_t end_offs = 0;
1414 int err;
1415
1416 trace_nfs4_pnfs_write(hdr, task->tk_status);
1417 if (task->tk_status < 0)
1418 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1419 hdr->args.offset, hdr->args.count,
1420 hdr->res.op_status, OP_WRITE,
1421 task->tk_status);
1422 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1423 hdr->ds_clp, hdr->lseg,
1424 hdr->pgio_mirror_idx);
1425
1426 switch (err) {
1427 case -NFS4ERR_RESET_TO_PNFS:
1428 ff_layout_reset_write(hdr, true);
1429 return task->tk_status;
1430 case -NFS4ERR_RESET_TO_MDS:
1431 ff_layout_reset_write(hdr, false);
1432 return task->tk_status;
1433 case -EAGAIN:
1434 return -EAGAIN;
1435 }
1436
1437 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1438 hdr->res.verf->committed == NFS_DATA_SYNC)
1439 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1440
1441 /* Note: if the write is unstable, don't set end_offs until commit */
1442 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1443
1444 /* zero out fattr since we don't care DS attr at all */
1445 hdr->fattr.valid = 0;
1446 if (task->tk_status >= 0)
1447 nfs_writeback_update_inode(hdr);
1448
1449 return 0;
1450 }
1451
1452 static int ff_layout_commit_done_cb(struct rpc_task *task,
1453 struct nfs_commit_data *data)
1454 {
1455 int err;
1456
1457 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1458 if (task->tk_status < 0)
1459 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1460 data->args.offset, data->args.count,
1461 data->res.op_status, OP_COMMIT,
1462 task->tk_status);
1463 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1464 data->lseg, data->ds_commit_index);
1465
1466 switch (err) {
1467 case -NFS4ERR_RESET_TO_PNFS:
1468 pnfs_generic_prepare_to_resend_writes(data);
1469 return -EAGAIN;
1470 case -NFS4ERR_RESET_TO_MDS:
1471 pnfs_generic_prepare_to_resend_writes(data);
1472 return -EAGAIN;
1473 case -EAGAIN:
1474 rpc_restart_call_prepare(task);
1475 return -EAGAIN;
1476 }
1477
1478 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1479
1480 return 0;
1481 }
1482
1483 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1484 struct nfs_pgio_header *hdr)
1485 {
1486 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1487 return;
1488 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1489 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1490 hdr->args.count,
1491 task->tk_start);
1492 }
1493
1494 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1495 struct nfs_pgio_header *hdr)
1496 {
1497 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1498 return;
1499 nfs4_ff_layout_stat_io_end_write(task,
1500 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1501 hdr->args.count, hdr->res.count,
1502 hdr->res.verf->committed);
1503 }
1504
1505 static int ff_layout_write_prepare_common(struct rpc_task *task,
1506 struct nfs_pgio_header *hdr)
1507 {
1508 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1509 rpc_exit(task, -EIO);
1510 return -EIO;
1511 }
1512
1513 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1514 rpc_exit(task, -EHOSTDOWN);
1515 return -EAGAIN;
1516 }
1517
1518 ff_layout_write_record_layoutstats_start(task, hdr);
1519 return 0;
1520 }
1521
1522 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1523 {
1524 struct nfs_pgio_header *hdr = data;
1525
1526 if (ff_layout_write_prepare_common(task, hdr))
1527 return;
1528
1529 rpc_call_start(task);
1530 }
1531
1532 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1533 {
1534 struct nfs_pgio_header *hdr = data;
1535
1536 if (nfs4_setup_sequence(hdr->ds_clp,
1537 &hdr->args.seq_args,
1538 &hdr->res.seq_res,
1539 task))
1540 return;
1541
1542 if (ff_layout_write_prepare_common(task, hdr))
1543 return;
1544
1545 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1546 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1547 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1548 }
1549
1550 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1551 {
1552 struct nfs_pgio_header *hdr = data;
1553
1554 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1555 task->tk_status == 0) {
1556 nfs4_sequence_done(task, &hdr->res.seq_res);
1557 return;
1558 }
1559
1560 /* Note this may cause RPC to be resent */
1561 hdr->mds_ops->rpc_call_done(task, hdr);
1562 }
1563
1564 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1565 {
1566 struct nfs_pgio_header *hdr = data;
1567
1568 ff_layout_write_record_layoutstats_done(task, hdr);
1569 rpc_count_iostats_metrics(task,
1570 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1571 }
1572
1573 static void ff_layout_write_release(void *data)
1574 {
1575 struct nfs_pgio_header *hdr = data;
1576
1577 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1578 pnfs_generic_rw_release(data);
1579 }
1580
1581 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1582 struct nfs_commit_data *cdata)
1583 {
1584 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1585 return;
1586 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1587 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1588 0, task->tk_start);
1589 }
1590
1591 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1592 struct nfs_commit_data *cdata)
1593 {
1594 struct nfs_page *req;
1595 __u64 count = 0;
1596
1597 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1598 return;
1599
1600 if (task->tk_status == 0) {
1601 list_for_each_entry(req, &cdata->pages, wb_list)
1602 count += req->wb_bytes;
1603 }
1604 nfs4_ff_layout_stat_io_end_write(task,
1605 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1606 count, count, NFS_FILE_SYNC);
1607 }
1608
1609 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1610 struct nfs_commit_data *cdata)
1611 {
1612 ff_layout_commit_record_layoutstats_start(task, cdata);
1613 }
1614
1615 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1616 {
1617 ff_layout_commit_prepare_common(task, data);
1618 rpc_call_start(task);
1619 }
1620
1621 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1622 {
1623 struct nfs_commit_data *wdata = data;
1624
1625 if (nfs4_setup_sequence(wdata->ds_clp,
1626 &wdata->args.seq_args,
1627 &wdata->res.seq_res,
1628 task))
1629 return;
1630 ff_layout_commit_prepare_common(task, data);
1631 }
1632
1633 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1634 {
1635 pnfs_generic_write_commit_done(task, data);
1636 }
1637
1638 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1639 {
1640 struct nfs_commit_data *cdata = data;
1641
1642 ff_layout_commit_record_layoutstats_done(task, cdata);
1643 rpc_count_iostats_metrics(task,
1644 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1645 }
1646
1647 static void ff_layout_commit_release(void *data)
1648 {
1649 struct nfs_commit_data *cdata = data;
1650
1651 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1652 pnfs_generic_commit_release(data);
1653 }
1654
1655 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1656 .rpc_call_prepare = ff_layout_read_prepare_v3,
1657 .rpc_call_done = ff_layout_read_call_done,
1658 .rpc_count_stats = ff_layout_read_count_stats,
1659 .rpc_release = ff_layout_read_release,
1660 };
1661
1662 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1663 .rpc_call_prepare = ff_layout_read_prepare_v4,
1664 .rpc_call_done = ff_layout_read_call_done,
1665 .rpc_count_stats = ff_layout_read_count_stats,
1666 .rpc_release = ff_layout_read_release,
1667 };
1668
1669 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1670 .rpc_call_prepare = ff_layout_write_prepare_v3,
1671 .rpc_call_done = ff_layout_write_call_done,
1672 .rpc_count_stats = ff_layout_write_count_stats,
1673 .rpc_release = ff_layout_write_release,
1674 };
1675
1676 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1677 .rpc_call_prepare = ff_layout_write_prepare_v4,
1678 .rpc_call_done = ff_layout_write_call_done,
1679 .rpc_count_stats = ff_layout_write_count_stats,
1680 .rpc_release = ff_layout_write_release,
1681 };
1682
1683 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1684 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1685 .rpc_call_done = ff_layout_commit_done,
1686 .rpc_count_stats = ff_layout_commit_count_stats,
1687 .rpc_release = ff_layout_commit_release,
1688 };
1689
1690 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1691 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1692 .rpc_call_done = ff_layout_commit_done,
1693 .rpc_count_stats = ff_layout_commit_count_stats,
1694 .rpc_release = ff_layout_commit_release,
1695 };
1696
1697 static enum pnfs_try_status
1698 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1699 {
1700 struct pnfs_layout_segment *lseg = hdr->lseg;
1701 struct nfs4_pnfs_ds *ds;
1702 struct rpc_clnt *ds_clnt;
1703 struct rpc_cred *ds_cred;
1704 loff_t offset = hdr->args.offset;
1705 u32 idx = hdr->pgio_mirror_idx;
1706 int vers;
1707 struct nfs_fh *fh;
1708
1709 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1710 __func__, hdr->inode->i_ino,
1711 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1712
1713 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1714 if (!ds)
1715 goto out_failed;
1716
1717 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1718 hdr->inode);
1719 if (IS_ERR(ds_clnt))
1720 goto out_failed;
1721
1722 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1723 if (!ds_cred)
1724 goto out_failed;
1725
1726 vers = nfs4_ff_layout_ds_version(lseg, idx);
1727
1728 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1729 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1730
1731 hdr->pgio_done_cb = ff_layout_read_done_cb;
1732 atomic_inc(&ds->ds_clp->cl_count);
1733 hdr->ds_clp = ds->ds_clp;
1734 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1735 if (fh)
1736 hdr->args.fh = fh;
1737 /*
1738 * Note that if we ever decide to split across DSes,
1739 * then we may need to handle dense-like offsets.
1740 */
1741 hdr->args.offset = offset;
1742 hdr->mds_offset = offset;
1743
1744 /* Perform an asynchronous read to ds */
1745 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1746 vers == 3 ? &ff_layout_read_call_ops_v3 :
1747 &ff_layout_read_call_ops_v4,
1748 0, RPC_TASK_SOFTCONN);
1749 put_rpccred(ds_cred);
1750 return PNFS_ATTEMPTED;
1751
1752 out_failed:
1753 if (ff_layout_avoid_mds_available_ds(lseg))
1754 return PNFS_TRY_AGAIN;
1755 return PNFS_NOT_ATTEMPTED;
1756 }
1757
1758 /* Perform async writes. */
1759 static enum pnfs_try_status
1760 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1761 {
1762 struct pnfs_layout_segment *lseg = hdr->lseg;
1763 struct nfs4_pnfs_ds *ds;
1764 struct rpc_clnt *ds_clnt;
1765 struct rpc_cred *ds_cred;
1766 loff_t offset = hdr->args.offset;
1767 int vers;
1768 struct nfs_fh *fh;
1769 int idx = hdr->pgio_mirror_idx;
1770
1771 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1772 if (!ds)
1773 goto out_failed;
1774
1775 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1776 hdr->inode);
1777 if (IS_ERR(ds_clnt))
1778 goto out_failed;
1779
1780 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1781 if (!ds_cred)
1782 goto out_failed;
1783
1784 vers = nfs4_ff_layout_ds_version(lseg, idx);
1785
1786 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1787 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1788 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1789 vers);
1790
1791 hdr->pgio_done_cb = ff_layout_write_done_cb;
1792 atomic_inc(&ds->ds_clp->cl_count);
1793 hdr->ds_clp = ds->ds_clp;
1794 hdr->ds_commit_idx = idx;
1795 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1796 if (fh)
1797 hdr->args.fh = fh;
1798
1799 /*
1800 * Note that if we ever decide to split across DSes,
1801 * then we may need to handle dense-like offsets.
1802 */
1803 hdr->args.offset = offset;
1804
1805 /* Perform an asynchronous write */
1806 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1807 vers == 3 ? &ff_layout_write_call_ops_v3 :
1808 &ff_layout_write_call_ops_v4,
1809 sync, RPC_TASK_SOFTCONN);
1810 put_rpccred(ds_cred);
1811 return PNFS_ATTEMPTED;
1812
1813 out_failed:
1814 if (ff_layout_avoid_mds_available_ds(lseg))
1815 return PNFS_TRY_AGAIN;
1816 return PNFS_NOT_ATTEMPTED;
1817 }
1818
1819 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1820 {
1821 return i;
1822 }
1823
1824 static struct nfs_fh *
1825 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1826 {
1827 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1828
1829 /* FIXME: Assume that there is only one NFS version available
1830 * for the DS.
1831 */
1832 return &flseg->mirror_array[i]->fh_versions[0];
1833 }
1834
1835 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1836 {
1837 struct pnfs_layout_segment *lseg = data->lseg;
1838 struct nfs4_pnfs_ds *ds;
1839 struct rpc_clnt *ds_clnt;
1840 struct rpc_cred *ds_cred;
1841 u32 idx;
1842 int vers, ret;
1843 struct nfs_fh *fh;
1844
1845 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1846 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1847 goto out_err;
1848
1849 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1850 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1851 if (!ds)
1852 goto out_err;
1853
1854 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1855 data->inode);
1856 if (IS_ERR(ds_clnt))
1857 goto out_err;
1858
1859 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1860 if (!ds_cred)
1861 goto out_err;
1862
1863 vers = nfs4_ff_layout_ds_version(lseg, idx);
1864
1865 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1866 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1867 vers);
1868 data->commit_done_cb = ff_layout_commit_done_cb;
1869 data->cred = ds_cred;
1870 atomic_inc(&ds->ds_clp->cl_count);
1871 data->ds_clp = ds->ds_clp;
1872 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1873 if (fh)
1874 data->args.fh = fh;
1875
1876 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1877 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1878 &ff_layout_commit_call_ops_v4,
1879 how, RPC_TASK_SOFTCONN);
1880 put_rpccred(ds_cred);
1881 return ret;
1882 out_err:
1883 pnfs_generic_prepare_to_resend_writes(data);
1884 pnfs_generic_commit_release(data);
1885 return -EAGAIN;
1886 }
1887
1888 static int
1889 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1890 int how, struct nfs_commit_info *cinfo)
1891 {
1892 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1893 ff_layout_initiate_commit);
1894 }
1895
1896 static struct pnfs_ds_commit_info *
1897 ff_layout_get_ds_info(struct inode *inode)
1898 {
1899 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1900
1901 if (layout == NULL)
1902 return NULL;
1903
1904 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1905 }
1906
1907 static void
1908 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1909 {
1910 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1911 id_node));
1912 }
1913
1914 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
1915 const struct nfs4_layoutreturn_args *args,
1916 const struct nfs4_flexfile_layoutreturn_args *ff_args)
1917 {
1918 __be32 *start;
1919
1920 start = xdr_reserve_space(xdr, 4);
1921 if (unlikely(!start))
1922 return -E2BIG;
1923
1924 *start = cpu_to_be32(ff_args->num_errors);
1925 /* This assume we always return _ALL_ layouts */
1926 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
1927 }
1928
1929 static void
1930 encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1931 {
1932 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
1933 }
1934
1935 static void
1936 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1937 const nfs4_stateid *stateid,
1938 const struct nfs42_layoutstat_devinfo *devinfo)
1939 {
1940 __be32 *p;
1941
1942 p = xdr_reserve_space(xdr, 8 + 8);
1943 p = xdr_encode_hyper(p, devinfo->offset);
1944 p = xdr_encode_hyper(p, devinfo->length);
1945 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1946 p = xdr_reserve_space(xdr, 4*8);
1947 p = xdr_encode_hyper(p, devinfo->read_count);
1948 p = xdr_encode_hyper(p, devinfo->read_bytes);
1949 p = xdr_encode_hyper(p, devinfo->write_count);
1950 p = xdr_encode_hyper(p, devinfo->write_bytes);
1951 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1952 }
1953
1954 static void
1955 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1956 const nfs4_stateid *stateid,
1957 const struct nfs42_layoutstat_devinfo *devinfo)
1958 {
1959 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1960 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1961 devinfo->ld_private.data);
1962 }
1963
1964 /* report nothing for now */
1965 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
1966 const struct nfs4_layoutreturn_args *args,
1967 struct nfs4_flexfile_layoutreturn_args *ff_args)
1968 {
1969 __be32 *p;
1970 int i;
1971
1972 p = xdr_reserve_space(xdr, 4);
1973 *p = cpu_to_be32(ff_args->num_dev);
1974 for (i = 0; i < ff_args->num_dev; i++)
1975 ff_layout_encode_ff_iostat(xdr,
1976 &args->layout->plh_stateid,
1977 &ff_args->devinfo[i]);
1978 }
1979
1980 static void
1981 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
1982 unsigned int num_entries)
1983 {
1984 unsigned int i;
1985
1986 for (i = 0; i < num_entries; i++) {
1987 if (!devinfo[i].ld_private.ops)
1988 continue;
1989 if (!devinfo[i].ld_private.ops->free)
1990 continue;
1991 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
1992 }
1993 }
1994
1995 static struct nfs4_deviceid_node *
1996 ff_layout_alloc_deviceid_node(struct nfs_server *server,
1997 struct pnfs_device *pdev, gfp_t gfp_flags)
1998 {
1999 struct nfs4_ff_layout_ds *dsaddr;
2000
2001 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2002 if (!dsaddr)
2003 return NULL;
2004 return &dsaddr->id_node;
2005 }
2006
2007 static void
2008 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2009 const void *voidargs,
2010 const struct nfs4_xdr_opaque_data *ff_opaque)
2011 {
2012 const struct nfs4_layoutreturn_args *args = voidargs;
2013 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2014 struct xdr_buf tmp_buf = {
2015 .head = {
2016 [0] = {
2017 .iov_base = page_address(ff_args->pages[0]),
2018 },
2019 },
2020 .buflen = PAGE_SIZE,
2021 };
2022 struct xdr_stream tmp_xdr;
2023 __be32 *start;
2024
2025 dprintk("%s: Begin\n", __func__);
2026
2027 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2028
2029 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2030 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2031
2032 start = xdr_reserve_space(xdr, 4);
2033 *start = cpu_to_be32(tmp_buf.len);
2034 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2035
2036 dprintk("%s: Return\n", __func__);
2037 }
2038
2039 static void
2040 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2041 {
2042 struct nfs4_flexfile_layoutreturn_args *ff_args;
2043
2044 if (!args->data)
2045 return;
2046 ff_args = args->data;
2047 args->data = NULL;
2048
2049 ff_layout_free_ds_ioerr(&ff_args->errors);
2050 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2051
2052 put_page(ff_args->pages[0]);
2053 kfree(ff_args);
2054 }
2055
2056 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2057 .encode = ff_layout_encode_layoutreturn,
2058 .free = ff_layout_free_layoutreturn,
2059 };
2060
2061 static int
2062 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2063 {
2064 struct nfs4_flexfile_layoutreturn_args *ff_args;
2065 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2066
2067 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2068 if (!ff_args)
2069 goto out_nomem;
2070 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2071 if (!ff_args->pages[0])
2072 goto out_nomem_free;
2073
2074 INIT_LIST_HEAD(&ff_args->errors);
2075 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2076 &args->range, &ff_args->errors,
2077 FF_LAYOUTRETURN_MAXERR);
2078
2079 spin_lock(&args->inode->i_lock);
2080 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2081 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2082 spin_unlock(&args->inode->i_lock);
2083
2084 args->ld_private->ops = &layoutreturn_ops;
2085 args->ld_private->data = ff_args;
2086 return 0;
2087 out_nomem_free:
2088 kfree(ff_args);
2089 out_nomem:
2090 return -ENOMEM;
2091 }
2092
2093 static int
2094 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2095 {
2096 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2097
2098 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2099 }
2100
2101 static size_t
2102 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2103 const int buflen)
2104 {
2105 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2106 const struct in6_addr *addr = &sin6->sin6_addr;
2107
2108 /*
2109 * RFC 4291, Section 2.2.2
2110 *
2111 * Shorthanded ANY address
2112 */
2113 if (ipv6_addr_any(addr))
2114 return snprintf(buf, buflen, "::");
2115
2116 /*
2117 * RFC 4291, Section 2.2.2
2118 *
2119 * Shorthanded loopback address
2120 */
2121 if (ipv6_addr_loopback(addr))
2122 return snprintf(buf, buflen, "::1");
2123
2124 /*
2125 * RFC 4291, Section 2.2.3
2126 *
2127 * Special presentation address format for mapped v4
2128 * addresses.
2129 */
2130 if (ipv6_addr_v4mapped(addr))
2131 return snprintf(buf, buflen, "::ffff:%pI4",
2132 &addr->s6_addr32[3]);
2133
2134 /*
2135 * RFC 4291, Section 2.2.1
2136 */
2137 return snprintf(buf, buflen, "%pI6c", addr);
2138 }
2139
2140 /* Derived from rpc_sockaddr2uaddr */
2141 static void
2142 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2143 {
2144 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2145 char portbuf[RPCBIND_MAXUADDRPLEN];
2146 char addrbuf[RPCBIND_MAXUADDRLEN];
2147 char *netid;
2148 unsigned short port;
2149 int len, netid_len;
2150 __be32 *p;
2151
2152 switch (sap->sa_family) {
2153 case AF_INET:
2154 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2155 return;
2156 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2157 netid = "tcp";
2158 netid_len = 3;
2159 break;
2160 case AF_INET6:
2161 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2162 return;
2163 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2164 netid = "tcp6";
2165 netid_len = 4;
2166 break;
2167 default:
2168 /* we only support tcp and tcp6 */
2169 WARN_ON_ONCE(1);
2170 return;
2171 }
2172
2173 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2174 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2175
2176 p = xdr_reserve_space(xdr, 4 + netid_len);
2177 xdr_encode_opaque(p, netid, netid_len);
2178
2179 p = xdr_reserve_space(xdr, 4 + len);
2180 xdr_encode_opaque(p, addrbuf, len);
2181 }
2182
2183 static void
2184 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2185 ktime_t t)
2186 {
2187 struct timespec64 ts;
2188 __be32 *p;
2189
2190 p = xdr_reserve_space(xdr, 12);
2191 ts = ktime_to_timespec64(t);
2192 p = xdr_encode_hyper(p, ts.tv_sec);
2193 *p++ = cpu_to_be32(ts.tv_nsec);
2194 }
2195
2196 static void
2197 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2198 struct nfs4_ff_io_stat *stat)
2199 {
2200 __be32 *p;
2201
2202 p = xdr_reserve_space(xdr, 5 * 8);
2203 p = xdr_encode_hyper(p, stat->ops_requested);
2204 p = xdr_encode_hyper(p, stat->bytes_requested);
2205 p = xdr_encode_hyper(p, stat->ops_completed);
2206 p = xdr_encode_hyper(p, stat->bytes_completed);
2207 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2208 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2209 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2210 }
2211
2212 static void
2213 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2214 const struct nfs42_layoutstat_devinfo *devinfo,
2215 struct nfs4_ff_layout_mirror *mirror)
2216 {
2217 struct nfs4_pnfs_ds_addr *da;
2218 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2219 struct nfs_fh *fh = &mirror->fh_versions[0];
2220 __be32 *p;
2221
2222 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2223 dprintk("%s: DS %s: encoding address %s\n",
2224 __func__, ds->ds_remotestr, da->da_remotestr);
2225 /* netaddr4 */
2226 ff_layout_encode_netaddr(xdr, da);
2227 /* nfs_fh4 */
2228 p = xdr_reserve_space(xdr, 4 + fh->size);
2229 xdr_encode_opaque(p, fh->data, fh->size);
2230 /* ff_io_latency4 read */
2231 spin_lock(&mirror->lock);
2232 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2233 /* ff_io_latency4 write */
2234 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2235 spin_unlock(&mirror->lock);
2236 /* nfstime4 */
2237 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2238 /* bool */
2239 p = xdr_reserve_space(xdr, 4);
2240 *p = cpu_to_be32(false);
2241 }
2242
2243 static void
2244 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2245 const struct nfs4_xdr_opaque_data *opaque)
2246 {
2247 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2248 struct nfs42_layoutstat_devinfo, ld_private);
2249 __be32 *start;
2250
2251 /* layoutupdate length */
2252 start = xdr_reserve_space(xdr, 4);
2253 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2254
2255 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2256 }
2257
2258 static void
2259 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2260 {
2261 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2262
2263 ff_layout_put_mirror(mirror);
2264 }
2265
2266 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2267 .encode = ff_layout_encode_layoutstats,
2268 .free = ff_layout_free_layoutstats,
2269 };
2270
2271 static int
2272 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2273 struct nfs42_layoutstat_devinfo *devinfo,
2274 int dev_limit)
2275 {
2276 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2277 struct nfs4_ff_layout_mirror *mirror;
2278 struct nfs4_deviceid_node *dev;
2279 int i = 0;
2280
2281 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2282 if (i >= dev_limit)
2283 break;
2284 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2285 continue;
2286 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2287 continue;
2288 /* mirror refcount put in cleanup_layoutstats */
2289 if (!atomic_inc_not_zero(&mirror->ref))
2290 continue;
2291 dev = &mirror->mirror_ds->id_node;
2292 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2293 devinfo->offset = 0;
2294 devinfo->length = NFS4_MAX_UINT64;
2295 spin_lock(&mirror->lock);
2296 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2297 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2298 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2299 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2300 spin_unlock(&mirror->lock);
2301 devinfo->layout_type = LAYOUT_FLEX_FILES;
2302 devinfo->ld_private.ops = &layoutstat_ops;
2303 devinfo->ld_private.data = mirror;
2304
2305 devinfo++;
2306 i++;
2307 }
2308 return i;
2309 }
2310
2311 static int
2312 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2313 {
2314 struct nfs4_flexfile_layout *ff_layout;
2315 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2316
2317 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2318 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2319 if (!args->devinfo)
2320 return -ENOMEM;
2321
2322 spin_lock(&args->inode->i_lock);
2323 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2324 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2325 &args->devinfo[0], dev_count);
2326 spin_unlock(&args->inode->i_lock);
2327 if (!args->num_dev) {
2328 kfree(args->devinfo);
2329 args->devinfo = NULL;
2330 return -ENOENT;
2331 }
2332
2333 return 0;
2334 }
2335
2336 static int
2337 ff_layout_set_layoutdriver(struct nfs_server *server,
2338 const struct nfs_fh *dummy)
2339 {
2340 #if IS_ENABLED(CONFIG_NFS_V4_2)
2341 server->caps |= NFS_CAP_LAYOUTSTATS;
2342 #endif
2343 return 0;
2344 }
2345
2346 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2347 .id = LAYOUT_FLEX_FILES,
2348 .name = "LAYOUT_FLEX_FILES",
2349 .owner = THIS_MODULE,
2350 .set_layoutdriver = ff_layout_set_layoutdriver,
2351 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2352 .free_layout_hdr = ff_layout_free_layout_hdr,
2353 .alloc_lseg = ff_layout_alloc_lseg,
2354 .free_lseg = ff_layout_free_lseg,
2355 .add_lseg = ff_layout_add_lseg,
2356 .pg_read_ops = &ff_layout_pg_read_ops,
2357 .pg_write_ops = &ff_layout_pg_write_ops,
2358 .get_ds_info = ff_layout_get_ds_info,
2359 .free_deviceid_node = ff_layout_free_deviceid_node,
2360 .mark_request_commit = pnfs_layout_mark_request_commit,
2361 .clear_request_commit = pnfs_generic_clear_request_commit,
2362 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2363 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2364 .commit_pagelist = ff_layout_commit_pagelist,
2365 .read_pagelist = ff_layout_read_pagelist,
2366 .write_pagelist = ff_layout_write_pagelist,
2367 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2368 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2369 .sync = pnfs_nfs_generic_sync,
2370 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2371 };
2372
2373 static int __init nfs4flexfilelayout_init(void)
2374 {
2375 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2376 __func__);
2377 if (!ff_zero_group) {
2378 ff_zero_group = groups_alloc(0);
2379 if (!ff_zero_group)
2380 return -ENOMEM;
2381 }
2382 return pnfs_register_layoutdriver(&flexfilelayout_type);
2383 }
2384
2385 static void __exit nfs4flexfilelayout_exit(void)
2386 {
2387 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2388 __func__);
2389 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2390 if (ff_zero_group) {
2391 put_group_info(ff_zero_group);
2392 ff_zero_group = NULL;
2393 }
2394 }
2395
2396 MODULE_ALIAS("nfs-layouttype4-4");
2397
2398 MODULE_LICENSE("GPL");
2399 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2400
2401 module_init(nfs4flexfilelayout_init);
2402 module_exit(nfs4flexfilelayout_exit);
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