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NFSv4.1/flexfiles: Remove mirror backpointer to lseg.
[deliverable/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
29 static struct pnfs_layout_hdr *
30 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
31 {
32 struct nfs4_flexfile_layout *ffl;
33
34 ffl = kzalloc(sizeof(*ffl), gfp_flags);
35 if (ffl) {
36 INIT_LIST_HEAD(&ffl->error_list);
37 return &ffl->generic_hdr;
38 } else
39 return NULL;
40 }
41
42 static void
43 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
44 {
45 struct nfs4_ff_layout_ds_err *err, *n;
46
47 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
48 list) {
49 list_del(&err->list);
50 kfree(err);
51 }
52 kfree(FF_LAYOUT_FROM_HDR(lo));
53 }
54
55 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
56 {
57 __be32 *p;
58
59 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
60 if (unlikely(p == NULL))
61 return -ENOBUFS;
62 memcpy(stateid, p, NFS4_STATEID_SIZE);
63 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
64 p[0], p[1], p[2], p[3]);
65 return 0;
66 }
67
68 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
69 {
70 __be32 *p;
71
72 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
73 if (unlikely(!p))
74 return -ENOBUFS;
75 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
76 nfs4_print_deviceid(devid);
77 return 0;
78 }
79
80 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
81 {
82 __be32 *p;
83
84 p = xdr_inline_decode(xdr, 4);
85 if (unlikely(!p))
86 return -ENOBUFS;
87 fh->size = be32_to_cpup(p++);
88 if (fh->size > sizeof(struct nfs_fh)) {
89 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
90 fh->size);
91 return -EOVERFLOW;
92 }
93 /* fh.data */
94 p = xdr_inline_decode(xdr, fh->size);
95 if (unlikely(!p))
96 return -ENOBUFS;
97 memcpy(&fh->data, p, fh->size);
98 dprintk("%s: fh len %d\n", __func__, fh->size);
99
100 return 0;
101 }
102
103 /*
104 * Currently only stringified uids and gids are accepted.
105 * I.e., kerberos is not supported to the DSes, so no pricipals.
106 *
107 * That means that one common function will suffice, but when
108 * principals are added, this should be split to accomodate
109 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
110 */
111 static int
112 decode_name(struct xdr_stream *xdr, u32 *id)
113 {
114 __be32 *p;
115 int len;
116
117 /* opaque_length(4)*/
118 p = xdr_inline_decode(xdr, 4);
119 if (unlikely(!p))
120 return -ENOBUFS;
121 len = be32_to_cpup(p++);
122 if (len < 0)
123 return -EINVAL;
124
125 dprintk("%s: len %u\n", __func__, len);
126
127 /* opaque body */
128 p = xdr_inline_decode(xdr, len);
129 if (unlikely(!p))
130 return -ENOBUFS;
131
132 if (!nfs_map_string_to_numeric((char *)p, len, id))
133 return -EINVAL;
134
135 return 0;
136 }
137
138 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
139 {
140 struct nfs4_ff_layout_mirror *mirror;
141
142 mirror = kzalloc(sizeof(*mirror), gfp_flags);
143 if (mirror != NULL) {
144 spin_lock_init(&mirror->lock);
145 atomic_set(&mirror->ref, 1);
146 }
147 return mirror;
148 }
149
150 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
151 {
152 kfree(mirror->fh_versions);
153 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
154 kfree(mirror);
155 }
156
157 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
158 {
159 if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
160 ff_layout_free_mirror(mirror);
161 }
162
163 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
164 {
165 int i;
166
167 if (fls->mirror_array) {
168 for (i = 0; i < fls->mirror_array_cnt; i++) {
169 /* normally mirror_ds is freed in
170 * .free_deviceid_node but we still do it here
171 * for .alloc_lseg error path */
172 ff_layout_put_mirror(fls->mirror_array[i]);
173 }
174 kfree(fls->mirror_array);
175 fls->mirror_array = NULL;
176 }
177 }
178
179 static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
180 {
181 int ret = 0;
182
183 dprintk("--> %s\n", __func__);
184
185 /* FIXME: remove this check when layout segment support is added */
186 if (lgr->range.offset != 0 ||
187 lgr->range.length != NFS4_MAX_UINT64) {
188 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
189 __func__);
190 ret = -EINVAL;
191 }
192
193 dprintk("--> %s returns %d\n", __func__, ret);
194 return ret;
195 }
196
197 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
198 {
199 if (fls) {
200 ff_layout_free_mirror_array(fls);
201 kfree(fls);
202 }
203 }
204
205 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
206 {
207 int i, j;
208
209 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
210 for (j = i + 1; j < fls->mirror_array_cnt; j++)
211 if (fls->mirror_array[i]->efficiency <
212 fls->mirror_array[j]->efficiency)
213 swap(fls->mirror_array[i],
214 fls->mirror_array[j]);
215 }
216 }
217
218 static struct pnfs_layout_segment *
219 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
220 struct nfs4_layoutget_res *lgr,
221 gfp_t gfp_flags)
222 {
223 struct pnfs_layout_segment *ret;
224 struct nfs4_ff_layout_segment *fls = NULL;
225 struct xdr_stream stream;
226 struct xdr_buf buf;
227 struct page *scratch;
228 u64 stripe_unit;
229 u32 mirror_array_cnt;
230 __be32 *p;
231 int i, rc;
232
233 dprintk("--> %s\n", __func__);
234 scratch = alloc_page(gfp_flags);
235 if (!scratch)
236 return ERR_PTR(-ENOMEM);
237
238 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
239 lgr->layoutp->len);
240 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
241
242 /* stripe unit and mirror_array_cnt */
243 rc = -EIO;
244 p = xdr_inline_decode(&stream, 8 + 4);
245 if (!p)
246 goto out_err_free;
247
248 p = xdr_decode_hyper(p, &stripe_unit);
249 mirror_array_cnt = be32_to_cpup(p++);
250 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
251 stripe_unit, mirror_array_cnt);
252
253 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
254 mirror_array_cnt == 0)
255 goto out_err_free;
256
257 rc = -ENOMEM;
258 fls = kzalloc(sizeof(*fls), gfp_flags);
259 if (!fls)
260 goto out_err_free;
261
262 fls->mirror_array_cnt = mirror_array_cnt;
263 fls->stripe_unit = stripe_unit;
264 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
265 sizeof(fls->mirror_array[0]), gfp_flags);
266 if (fls->mirror_array == NULL)
267 goto out_err_free;
268
269 for (i = 0; i < fls->mirror_array_cnt; i++) {
270 struct nfs4_deviceid devid;
271 struct nfs4_deviceid_node *idnode;
272 u32 ds_count;
273 u32 fh_count;
274 int j;
275
276 rc = -EIO;
277 p = xdr_inline_decode(&stream, 4);
278 if (!p)
279 goto out_err_free;
280 ds_count = be32_to_cpup(p);
281
282 /* FIXME: allow for striping? */
283 if (ds_count != 1)
284 goto out_err_free;
285
286 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
287 if (fls->mirror_array[i] == NULL) {
288 rc = -ENOMEM;
289 goto out_err_free;
290 }
291
292 fls->mirror_array[i]->ds_count = ds_count;
293
294 /* deviceid */
295 rc = decode_deviceid(&stream, &devid);
296 if (rc)
297 goto out_err_free;
298
299 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
300 &devid, lh->plh_lc_cred,
301 gfp_flags);
302 /*
303 * upon success, mirror_ds is allocated by previous
304 * getdeviceinfo, or newly by .alloc_deviceid_node
305 * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
306 */
307 if (idnode)
308 fls->mirror_array[i]->mirror_ds =
309 FF_LAYOUT_MIRROR_DS(idnode);
310 else
311 goto out_err_free;
312
313 /* efficiency */
314 rc = -EIO;
315 p = xdr_inline_decode(&stream, 4);
316 if (!p)
317 goto out_err_free;
318 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
319
320 /* stateid */
321 rc = decode_stateid(&stream, &fls->mirror_array[i]->stateid);
322 if (rc)
323 goto out_err_free;
324
325 /* fh */
326 p = xdr_inline_decode(&stream, 4);
327 if (!p)
328 goto out_err_free;
329 fh_count = be32_to_cpup(p);
330
331 fls->mirror_array[i]->fh_versions =
332 kzalloc(fh_count * sizeof(struct nfs_fh),
333 gfp_flags);
334 if (fls->mirror_array[i]->fh_versions == NULL) {
335 rc = -ENOMEM;
336 goto out_err_free;
337 }
338
339 for (j = 0; j < fh_count; j++) {
340 rc = decode_nfs_fh(&stream,
341 &fls->mirror_array[i]->fh_versions[j]);
342 if (rc)
343 goto out_err_free;
344 }
345
346 fls->mirror_array[i]->fh_versions_cnt = fh_count;
347
348 /* user */
349 rc = decode_name(&stream, &fls->mirror_array[i]->uid);
350 if (rc)
351 goto out_err_free;
352
353 /* group */
354 rc = decode_name(&stream, &fls->mirror_array[i]->gid);
355 if (rc)
356 goto out_err_free;
357
358 dprintk("%s: uid %d gid %d\n", __func__,
359 fls->mirror_array[i]->uid,
360 fls->mirror_array[i]->gid);
361 }
362
363 p = xdr_inline_decode(&stream, 4);
364 if (p)
365 fls->flags = be32_to_cpup(p);
366
367 ff_layout_sort_mirrors(fls);
368 rc = ff_layout_check_layout(lgr);
369 if (rc)
370 goto out_err_free;
371
372 ret = &fls->generic_hdr;
373 dprintk("<-- %s (success)\n", __func__);
374 out_free_page:
375 __free_page(scratch);
376 return ret;
377 out_err_free:
378 _ff_layout_free_lseg(fls);
379 ret = ERR_PTR(rc);
380 dprintk("<-- %s (%d)\n", __func__, rc);
381 goto out_free_page;
382 }
383
384 static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
385 {
386 struct pnfs_layout_segment *lseg;
387
388 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
389 if (lseg->pls_range.iomode == IOMODE_RW)
390 return true;
391
392 return false;
393 }
394
395 static void
396 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
397 {
398 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
399 int i;
400
401 dprintk("--> %s\n", __func__);
402
403 for (i = 0; i < fls->mirror_array_cnt; i++) {
404 if (fls->mirror_array[i]) {
405 nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
406 fls->mirror_array[i]->mirror_ds = NULL;
407 if (fls->mirror_array[i]->cred) {
408 put_rpccred(fls->mirror_array[i]->cred);
409 fls->mirror_array[i]->cred = NULL;
410 }
411 }
412 }
413
414 if (lseg->pls_range.iomode == IOMODE_RW) {
415 struct nfs4_flexfile_layout *ffl;
416 struct inode *inode;
417
418 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
419 inode = ffl->generic_hdr.plh_inode;
420 spin_lock(&inode->i_lock);
421 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
422 ffl->commit_info.nbuckets = 0;
423 kfree(ffl->commit_info.buckets);
424 ffl->commit_info.buckets = NULL;
425 }
426 spin_unlock(&inode->i_lock);
427 }
428 _ff_layout_free_lseg(fls);
429 }
430
431 /* Return 1 until we have multiple lsegs support */
432 static int
433 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
434 {
435 return 1;
436 }
437
438 static void
439 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
440 {
441 /* first IO request? */
442 if (atomic_inc_return(&timer->n_ops) == 1) {
443 timer->start_time = now;
444 }
445 }
446
447 static ktime_t
448 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
449 {
450 ktime_t start;
451
452 if (atomic_dec_return(&timer->n_ops) < 0)
453 WARN_ON_ONCE(1);
454
455 start = timer->start_time;
456 timer->start_time = now;
457 return ktime_sub(now, start);
458 }
459
460 static bool
461 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
462 struct nfs4_ff_layoutstat *layoutstat,
463 ktime_t now)
464 {
465 static const ktime_t notime = {0};
466
467 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
468 if (ktime_equal(mirror->start_time, notime))
469 mirror->start_time = now;
470 if (ktime_equal(mirror->last_report_time, notime))
471 mirror->last_report_time = now;
472 if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >=
473 FF_LAYOUTSTATS_REPORT_INTERVAL) {
474 mirror->last_report_time = now;
475 return true;
476 }
477
478 return false;
479 }
480
481 static void
482 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
483 __u64 requested)
484 {
485 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
486
487 iostat->ops_requested++;
488 iostat->bytes_requested += requested;
489 }
490
491 static void
492 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
493 __u64 requested,
494 __u64 completed,
495 ktime_t time_completed,
496 ktime_t time_started)
497 {
498 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
499 ktime_t completion_time = ktime_sub(time_completed, time_started);
500 ktime_t timer;
501
502 iostat->ops_completed++;
503 iostat->bytes_completed += completed;
504 iostat->bytes_not_delivered += requested - completed;
505
506 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
507 iostat->total_busy_time =
508 ktime_add(iostat->total_busy_time, timer);
509 iostat->aggregate_completion_time =
510 ktime_add(iostat->aggregate_completion_time,
511 completion_time);
512 }
513
514 static void
515 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
516 struct nfs4_ff_layout_mirror *mirror,
517 __u64 requested, ktime_t now)
518 {
519 bool report;
520
521 spin_lock(&mirror->lock);
522 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
523 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
524 spin_unlock(&mirror->lock);
525
526 if (report)
527 pnfs_report_layoutstat(inode, GFP_KERNEL);
528 }
529
530 static void
531 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
532 struct nfs4_ff_layout_mirror *mirror,
533 __u64 requested,
534 __u64 completed)
535 {
536 spin_lock(&mirror->lock);
537 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
538 requested, completed,
539 ktime_get(), task->tk_start);
540 spin_unlock(&mirror->lock);
541 }
542
543 static void
544 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
545 struct nfs4_ff_layout_mirror *mirror,
546 __u64 requested, ktime_t now)
547 {
548 bool report;
549
550 spin_lock(&mirror->lock);
551 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
552 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
553 spin_unlock(&mirror->lock);
554
555 if (report)
556 pnfs_report_layoutstat(inode, GFP_NOIO);
557 }
558
559 static void
560 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
561 struct nfs4_ff_layout_mirror *mirror,
562 __u64 requested,
563 __u64 completed,
564 enum nfs3_stable_how committed)
565 {
566 if (committed == NFS_UNSTABLE)
567 requested = completed = 0;
568
569 spin_lock(&mirror->lock);
570 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
571 requested, completed, ktime_get(), task->tk_start);
572 spin_unlock(&mirror->lock);
573 }
574
575 static int
576 ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
577 struct nfs_commit_info *cinfo,
578 gfp_t gfp_flags)
579 {
580 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
581 struct pnfs_commit_bucket *buckets;
582 int size;
583
584 if (cinfo->ds->nbuckets != 0) {
585 /* This assumes there is only one RW lseg per file.
586 * To support multiple lseg per file, we need to
587 * change struct pnfs_commit_bucket to allow dynamic
588 * increasing nbuckets.
589 */
590 return 0;
591 }
592
593 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
594
595 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
596 gfp_flags);
597 if (!buckets)
598 return -ENOMEM;
599 else {
600 int i;
601
602 spin_lock(cinfo->lock);
603 if (cinfo->ds->nbuckets != 0)
604 kfree(buckets);
605 else {
606 cinfo->ds->buckets = buckets;
607 cinfo->ds->nbuckets = size;
608 for (i = 0; i < size; i++) {
609 INIT_LIST_HEAD(&buckets[i].written);
610 INIT_LIST_HEAD(&buckets[i].committing);
611 /* mark direct verifier as unset */
612 buckets[i].direct_verf.committed =
613 NFS_INVALID_STABLE_HOW;
614 }
615 }
616 spin_unlock(cinfo->lock);
617 return 0;
618 }
619 }
620
621 static struct nfs4_pnfs_ds *
622 ff_layout_choose_best_ds_for_read(struct nfs_pageio_descriptor *pgio,
623 int *best_idx)
624 {
625 struct nfs4_ff_layout_segment *fls;
626 struct nfs4_pnfs_ds *ds;
627 int idx;
628
629 fls = FF_LAYOUT_LSEG(pgio->pg_lseg);
630 /* mirrors are sorted by efficiency */
631 for (idx = 0; idx < fls->mirror_array_cnt; idx++) {
632 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, idx, false);
633 if (ds) {
634 *best_idx = idx;
635 return ds;
636 }
637 }
638
639 return NULL;
640 }
641
642 static void
643 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
644 struct nfs_page *req)
645 {
646 struct nfs_pgio_mirror *pgm;
647 struct nfs4_ff_layout_mirror *mirror;
648 struct nfs4_pnfs_ds *ds;
649 int ds_idx;
650
651 /* Use full layout for now */
652 if (!pgio->pg_lseg)
653 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
654 req->wb_context,
655 0,
656 NFS4_MAX_UINT64,
657 IOMODE_READ,
658 GFP_KERNEL);
659 /* If no lseg, fall back to read through mds */
660 if (pgio->pg_lseg == NULL)
661 goto out_mds;
662
663 ds = ff_layout_choose_best_ds_for_read(pgio, &ds_idx);
664 if (!ds)
665 goto out_mds;
666 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
667
668 pgio->pg_mirror_idx = ds_idx;
669
670 /* read always uses only one mirror - idx 0 for pgio layer */
671 pgm = &pgio->pg_mirrors[0];
672 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
673
674 return;
675 out_mds:
676 pnfs_put_lseg(pgio->pg_lseg);
677 pgio->pg_lseg = NULL;
678 nfs_pageio_reset_read_mds(pgio);
679 }
680
681 static void
682 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
683 struct nfs_page *req)
684 {
685 struct nfs4_ff_layout_mirror *mirror;
686 struct nfs_pgio_mirror *pgm;
687 struct nfs_commit_info cinfo;
688 struct nfs4_pnfs_ds *ds;
689 int i;
690 int status;
691
692 if (!pgio->pg_lseg)
693 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
694 req->wb_context,
695 0,
696 NFS4_MAX_UINT64,
697 IOMODE_RW,
698 GFP_NOFS);
699 /* If no lseg, fall back to write through mds */
700 if (pgio->pg_lseg == NULL)
701 goto out_mds;
702
703 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
704 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
705 if (status < 0)
706 goto out_mds;
707
708 /* Use a direct mapping of ds_idx to pgio mirror_idx */
709 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
710 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
711 goto out_mds;
712
713 for (i = 0; i < pgio->pg_mirror_count; i++) {
714 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
715 if (!ds)
716 goto out_mds;
717 pgm = &pgio->pg_mirrors[i];
718 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
719 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
720 }
721
722 return;
723
724 out_mds:
725 pnfs_put_lseg(pgio->pg_lseg);
726 pgio->pg_lseg = NULL;
727 nfs_pageio_reset_write_mds(pgio);
728 }
729
730 static unsigned int
731 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
732 struct nfs_page *req)
733 {
734 if (!pgio->pg_lseg)
735 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
736 req->wb_context,
737 0,
738 NFS4_MAX_UINT64,
739 IOMODE_RW,
740 GFP_NOFS);
741 if (pgio->pg_lseg)
742 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
743
744 /* no lseg means that pnfs is not in use, so no mirroring here */
745 nfs_pageio_reset_write_mds(pgio);
746 return 1;
747 }
748
749 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
750 .pg_init = ff_layout_pg_init_read,
751 .pg_test = pnfs_generic_pg_test,
752 .pg_doio = pnfs_generic_pg_readpages,
753 .pg_cleanup = pnfs_generic_pg_cleanup,
754 };
755
756 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
757 .pg_init = ff_layout_pg_init_write,
758 .pg_test = pnfs_generic_pg_test,
759 .pg_doio = pnfs_generic_pg_writepages,
760 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
761 .pg_cleanup = pnfs_generic_pg_cleanup,
762 };
763
764 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
765 {
766 struct rpc_task *task = &hdr->task;
767
768 pnfs_layoutcommit_inode(hdr->inode, false);
769
770 if (retry_pnfs) {
771 dprintk("%s Reset task %5u for i/o through pNFS "
772 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
773 hdr->task.tk_pid,
774 hdr->inode->i_sb->s_id,
775 (unsigned long long)NFS_FILEID(hdr->inode),
776 hdr->args.count,
777 (unsigned long long)hdr->args.offset);
778
779 if (!hdr->dreq) {
780 struct nfs_open_context *ctx;
781
782 ctx = nfs_list_entry(hdr->pages.next)->wb_context;
783 set_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
784 hdr->completion_ops->error_cleanup(&hdr->pages);
785 } else {
786 nfs_direct_set_resched_writes(hdr->dreq);
787 /* fake unstable write to let common nfs resend pages */
788 hdr->verf.committed = NFS_UNSTABLE;
789 hdr->good_bytes = hdr->args.count;
790 }
791 return;
792 }
793
794 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
795 dprintk("%s Reset task %5u for i/o through MDS "
796 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
797 hdr->task.tk_pid,
798 hdr->inode->i_sb->s_id,
799 (unsigned long long)NFS_FILEID(hdr->inode),
800 hdr->args.count,
801 (unsigned long long)hdr->args.offset);
802
803 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
804 }
805 }
806
807 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
808 {
809 struct rpc_task *task = &hdr->task;
810
811 pnfs_layoutcommit_inode(hdr->inode, false);
812
813 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
814 dprintk("%s Reset task %5u for i/o through MDS "
815 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
816 hdr->task.tk_pid,
817 hdr->inode->i_sb->s_id,
818 (unsigned long long)NFS_FILEID(hdr->inode),
819 hdr->args.count,
820 (unsigned long long)hdr->args.offset);
821
822 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
823 }
824 }
825
826 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
827 struct nfs4_state *state,
828 struct nfs_client *clp,
829 struct pnfs_layout_segment *lseg,
830 int idx)
831 {
832 struct pnfs_layout_hdr *lo = lseg->pls_layout;
833 struct inode *inode = lo->plh_inode;
834 struct nfs_server *mds_server = NFS_SERVER(inode);
835
836 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
837 struct nfs_client *mds_client = mds_server->nfs_client;
838 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
839
840 if (task->tk_status >= 0)
841 return 0;
842
843 switch (task->tk_status) {
844 /* MDS state errors */
845 case -NFS4ERR_DELEG_REVOKED:
846 case -NFS4ERR_ADMIN_REVOKED:
847 case -NFS4ERR_BAD_STATEID:
848 if (state == NULL)
849 break;
850 nfs_remove_bad_delegation(state->inode);
851 case -NFS4ERR_OPENMODE:
852 if (state == NULL)
853 break;
854 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
855 goto out_bad_stateid;
856 goto wait_on_recovery;
857 case -NFS4ERR_EXPIRED:
858 if (state != NULL) {
859 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
860 goto out_bad_stateid;
861 }
862 nfs4_schedule_lease_recovery(mds_client);
863 goto wait_on_recovery;
864 /* DS session errors */
865 case -NFS4ERR_BADSESSION:
866 case -NFS4ERR_BADSLOT:
867 case -NFS4ERR_BAD_HIGH_SLOT:
868 case -NFS4ERR_DEADSESSION:
869 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
870 case -NFS4ERR_SEQ_FALSE_RETRY:
871 case -NFS4ERR_SEQ_MISORDERED:
872 dprintk("%s ERROR %d, Reset session. Exchangeid "
873 "flags 0x%x\n", __func__, task->tk_status,
874 clp->cl_exchange_flags);
875 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
876 break;
877 case -NFS4ERR_DELAY:
878 case -NFS4ERR_GRACE:
879 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
880 break;
881 case -NFS4ERR_RETRY_UNCACHED_REP:
882 break;
883 /* Invalidate Layout errors */
884 case -NFS4ERR_PNFS_NO_LAYOUT:
885 case -ESTALE: /* mapped NFS4ERR_STALE */
886 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
887 case -EISDIR: /* mapped NFS4ERR_ISDIR */
888 case -NFS4ERR_FHEXPIRED:
889 case -NFS4ERR_WRONG_TYPE:
890 dprintk("%s Invalid layout error %d\n", __func__,
891 task->tk_status);
892 /*
893 * Destroy layout so new i/o will get a new layout.
894 * Layout will not be destroyed until all current lseg
895 * references are put. Mark layout as invalid to resend failed
896 * i/o and all i/o waiting on the slot table to the MDS until
897 * layout is destroyed and a new valid layout is obtained.
898 */
899 pnfs_destroy_layout(NFS_I(inode));
900 rpc_wake_up(&tbl->slot_tbl_waitq);
901 goto reset;
902 /* RPC connection errors */
903 case -ECONNREFUSED:
904 case -EHOSTDOWN:
905 case -EHOSTUNREACH:
906 case -ENETUNREACH:
907 case -EIO:
908 case -ETIMEDOUT:
909 case -EPIPE:
910 dprintk("%s DS connection error %d\n", __func__,
911 task->tk_status);
912 nfs4_mark_deviceid_unavailable(devid);
913 rpc_wake_up(&tbl->slot_tbl_waitq);
914 /* fall through */
915 default:
916 if (ff_layout_has_available_ds(lseg))
917 return -NFS4ERR_RESET_TO_PNFS;
918 reset:
919 dprintk("%s Retry through MDS. Error %d\n", __func__,
920 task->tk_status);
921 return -NFS4ERR_RESET_TO_MDS;
922 }
923 out:
924 task->tk_status = 0;
925 return -EAGAIN;
926 out_bad_stateid:
927 task->tk_status = -EIO;
928 return 0;
929 wait_on_recovery:
930 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
931 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
932 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
933 goto out;
934 }
935
936 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
937 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
938 struct pnfs_layout_segment *lseg,
939 int idx)
940 {
941 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
942
943 if (task->tk_status >= 0)
944 return 0;
945
946 if (task->tk_status != -EJUKEBOX) {
947 dprintk("%s DS connection error %d\n", __func__,
948 task->tk_status);
949 nfs4_mark_deviceid_unavailable(devid);
950 if (ff_layout_has_available_ds(lseg))
951 return -NFS4ERR_RESET_TO_PNFS;
952 else
953 return -NFS4ERR_RESET_TO_MDS;
954 }
955
956 if (task->tk_status == -EJUKEBOX)
957 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
958 task->tk_status = 0;
959 rpc_restart_call(task);
960 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
961 return -EAGAIN;
962 }
963
964 static int ff_layout_async_handle_error(struct rpc_task *task,
965 struct nfs4_state *state,
966 struct nfs_client *clp,
967 struct pnfs_layout_segment *lseg,
968 int idx)
969 {
970 int vers = clp->cl_nfs_mod->rpc_vers->number;
971
972 switch (vers) {
973 case 3:
974 return ff_layout_async_handle_error_v3(task, lseg, idx);
975 case 4:
976 return ff_layout_async_handle_error_v4(task, state, clp,
977 lseg, idx);
978 default:
979 /* should never happen */
980 WARN_ON_ONCE(1);
981 return 0;
982 }
983 }
984
985 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
986 int idx, u64 offset, u64 length,
987 u32 status, int opnum, int error)
988 {
989 struct nfs4_ff_layout_mirror *mirror;
990 int err;
991
992 if (status == 0) {
993 switch (error) {
994 case -ETIMEDOUT:
995 case -EPFNOSUPPORT:
996 case -EPROTONOSUPPORT:
997 case -EOPNOTSUPP:
998 case -ECONNREFUSED:
999 case -ECONNRESET:
1000 case -EHOSTDOWN:
1001 case -EHOSTUNREACH:
1002 case -ENETUNREACH:
1003 case -EADDRINUSE:
1004 case -ENOBUFS:
1005 case -EPIPE:
1006 case -EPERM:
1007 status = NFS4ERR_NXIO;
1008 break;
1009 case -EACCES:
1010 status = NFS4ERR_ACCESS;
1011 break;
1012 default:
1013 return;
1014 }
1015 }
1016
1017 mirror = FF_LAYOUT_COMP(lseg, idx);
1018 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1019 mirror, offset, length, status, opnum,
1020 GFP_NOIO);
1021 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1022 }
1023
1024 /* NFS_PROTO call done callback routines */
1025
1026 static int ff_layout_read_done_cb(struct rpc_task *task,
1027 struct nfs_pgio_header *hdr)
1028 {
1029 struct inode *inode;
1030 int err;
1031
1032 trace_nfs4_pnfs_read(hdr, task->tk_status);
1033 if (task->tk_status < 0)
1034 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1035 hdr->args.offset, hdr->args.count,
1036 hdr->res.op_status, OP_READ,
1037 task->tk_status);
1038 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1039 hdr->ds_clp, hdr->lseg,
1040 hdr->pgio_mirror_idx);
1041
1042 switch (err) {
1043 case -NFS4ERR_RESET_TO_PNFS:
1044 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1045 &hdr->lseg->pls_layout->plh_flags);
1046 pnfs_read_resend_pnfs(hdr);
1047 return task->tk_status;
1048 case -NFS4ERR_RESET_TO_MDS:
1049 inode = hdr->lseg->pls_layout->plh_inode;
1050 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1051 ff_layout_reset_read(hdr);
1052 return task->tk_status;
1053 case -EAGAIN:
1054 rpc_restart_call_prepare(task);
1055 return -EAGAIN;
1056 }
1057
1058 return 0;
1059 }
1060
1061 static bool
1062 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1063 {
1064 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1065 }
1066
1067 /*
1068 * We reference the rpc_cred of the first WRITE that triggers the need for
1069 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1070 * rfc5661 is not clear about which credential should be used.
1071 *
1072 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1073 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1074 * we always send layoutcommit after DS writes.
1075 */
1076 static void
1077 ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
1078 {
1079 if (!ff_layout_need_layoutcommit(hdr->lseg))
1080 return;
1081
1082 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1083 hdr->mds_offset + hdr->res.count);
1084 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
1085 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
1086 }
1087
1088 static bool
1089 ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx)
1090 {
1091 /* No mirroring for now */
1092 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1093
1094 return ff_layout_test_devid_unavailable(node);
1095 }
1096
1097 static int ff_layout_read_prepare_common(struct rpc_task *task,
1098 struct nfs_pgio_header *hdr)
1099 {
1100 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1101 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1102 hdr->args.count,
1103 task->tk_start);
1104
1105 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1106 rpc_exit(task, -EIO);
1107 return -EIO;
1108 }
1109 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1110 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
1111 if (ff_layout_has_available_ds(hdr->lseg))
1112 pnfs_read_resend_pnfs(hdr);
1113 else
1114 ff_layout_reset_read(hdr);
1115 rpc_exit(task, 0);
1116 return -EAGAIN;
1117 }
1118 hdr->pgio_done_cb = ff_layout_read_done_cb;
1119
1120 return 0;
1121 }
1122
1123 /*
1124 * Call ops for the async read/write cases
1125 * In the case of dense layouts, the offset needs to be reset to its
1126 * original value.
1127 */
1128 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1129 {
1130 struct nfs_pgio_header *hdr = data;
1131
1132 if (ff_layout_read_prepare_common(task, hdr))
1133 return;
1134
1135 rpc_call_start(task);
1136 }
1137
1138 static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1139 struct nfs4_sequence_args *args,
1140 struct nfs4_sequence_res *res,
1141 struct rpc_task *task)
1142 {
1143 if (ds_clp->cl_session)
1144 return nfs41_setup_sequence(ds_clp->cl_session,
1145 args,
1146 res,
1147 task);
1148 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1149 args,
1150 res,
1151 task);
1152 }
1153
1154 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1155 {
1156 struct nfs_pgio_header *hdr = data;
1157
1158 if (ff_layout_setup_sequence(hdr->ds_clp,
1159 &hdr->args.seq_args,
1160 &hdr->res.seq_res,
1161 task))
1162 return;
1163
1164 if (ff_layout_read_prepare_common(task, hdr))
1165 return;
1166
1167 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1168 hdr->args.lock_context, FMODE_READ) == -EIO)
1169 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1170 }
1171
1172 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1173 {
1174 struct nfs_pgio_header *hdr = data;
1175
1176 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1177
1178 nfs4_ff_layout_stat_io_end_read(task,
1179 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1180 hdr->args.count, hdr->res.count);
1181
1182 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1183 task->tk_status == 0) {
1184 nfs4_sequence_done(task, &hdr->res.seq_res);
1185 return;
1186 }
1187
1188 /* Note this may cause RPC to be resent */
1189 hdr->mds_ops->rpc_call_done(task, hdr);
1190 }
1191
1192 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1193 {
1194 struct nfs_pgio_header *hdr = data;
1195
1196 rpc_count_iostats_metrics(task,
1197 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1198 }
1199
1200 static int ff_layout_write_done_cb(struct rpc_task *task,
1201 struct nfs_pgio_header *hdr)
1202 {
1203 struct inode *inode;
1204 int err;
1205
1206 trace_nfs4_pnfs_write(hdr, task->tk_status);
1207 if (task->tk_status < 0)
1208 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1209 hdr->args.offset, hdr->args.count,
1210 hdr->res.op_status, OP_WRITE,
1211 task->tk_status);
1212 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1213 hdr->ds_clp, hdr->lseg,
1214 hdr->pgio_mirror_idx);
1215
1216 switch (err) {
1217 case -NFS4ERR_RESET_TO_PNFS:
1218 case -NFS4ERR_RESET_TO_MDS:
1219 inode = hdr->lseg->pls_layout->plh_inode;
1220 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1221 if (err == -NFS4ERR_RESET_TO_PNFS) {
1222 pnfs_set_retry_layoutget(hdr->lseg->pls_layout);
1223 ff_layout_reset_write(hdr, true);
1224 } else {
1225 pnfs_clear_retry_layoutget(hdr->lseg->pls_layout);
1226 ff_layout_reset_write(hdr, false);
1227 }
1228 return task->tk_status;
1229 case -EAGAIN:
1230 rpc_restart_call_prepare(task);
1231 return -EAGAIN;
1232 }
1233
1234 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1235 hdr->res.verf->committed == NFS_DATA_SYNC)
1236 ff_layout_set_layoutcommit(hdr);
1237
1238 /* zero out fattr since we don't care DS attr at all */
1239 hdr->fattr.valid = 0;
1240 if (task->tk_status >= 0)
1241 nfs_writeback_update_inode(hdr);
1242
1243 return 0;
1244 }
1245
1246 static int ff_layout_commit_done_cb(struct rpc_task *task,
1247 struct nfs_commit_data *data)
1248 {
1249 struct inode *inode;
1250 int err;
1251
1252 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1253 if (task->tk_status < 0)
1254 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1255 data->args.offset, data->args.count,
1256 data->res.op_status, OP_COMMIT,
1257 task->tk_status);
1258 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1259 data->lseg, data->ds_commit_index);
1260
1261 switch (err) {
1262 case -NFS4ERR_RESET_TO_PNFS:
1263 case -NFS4ERR_RESET_TO_MDS:
1264 inode = data->lseg->pls_layout->plh_inode;
1265 pnfs_error_mark_layout_for_return(inode, data->lseg);
1266 if (err == -NFS4ERR_RESET_TO_PNFS)
1267 pnfs_set_retry_layoutget(data->lseg->pls_layout);
1268 else
1269 pnfs_clear_retry_layoutget(data->lseg->pls_layout);
1270 pnfs_generic_prepare_to_resend_writes(data);
1271 return -EAGAIN;
1272 case -EAGAIN:
1273 rpc_restart_call_prepare(task);
1274 return -EAGAIN;
1275 }
1276
1277 if (data->verf.committed == NFS_UNSTABLE
1278 && ff_layout_need_layoutcommit(data->lseg))
1279 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
1280
1281 return 0;
1282 }
1283
1284 static int ff_layout_write_prepare_common(struct rpc_task *task,
1285 struct nfs_pgio_header *hdr)
1286 {
1287 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1288 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1289 hdr->args.count,
1290 task->tk_start);
1291
1292 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1293 rpc_exit(task, -EIO);
1294 return -EIO;
1295 }
1296
1297 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1298 bool retry_pnfs;
1299
1300 retry_pnfs = ff_layout_has_available_ds(hdr->lseg);
1301 dprintk("%s task %u reset io to %s\n", __func__,
1302 task->tk_pid, retry_pnfs ? "pNFS" : "MDS");
1303 ff_layout_reset_write(hdr, retry_pnfs);
1304 rpc_exit(task, 0);
1305 return -EAGAIN;
1306 }
1307
1308 return 0;
1309 }
1310
1311 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1312 {
1313 struct nfs_pgio_header *hdr = data;
1314
1315 if (ff_layout_write_prepare_common(task, hdr))
1316 return;
1317
1318 rpc_call_start(task);
1319 }
1320
1321 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1322 {
1323 struct nfs_pgio_header *hdr = data;
1324
1325 if (ff_layout_setup_sequence(hdr->ds_clp,
1326 &hdr->args.seq_args,
1327 &hdr->res.seq_res,
1328 task))
1329 return;
1330
1331 if (ff_layout_write_prepare_common(task, hdr))
1332 return;
1333
1334 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1335 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1336 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1337 }
1338
1339 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1340 {
1341 struct nfs_pgio_header *hdr = data;
1342
1343 nfs4_ff_layout_stat_io_end_write(task,
1344 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1345 hdr->args.count, hdr->res.count,
1346 hdr->res.verf->committed);
1347
1348 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1349 task->tk_status == 0) {
1350 nfs4_sequence_done(task, &hdr->res.seq_res);
1351 return;
1352 }
1353
1354 /* Note this may cause RPC to be resent */
1355 hdr->mds_ops->rpc_call_done(task, hdr);
1356 }
1357
1358 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1359 {
1360 struct nfs_pgio_header *hdr = data;
1361
1362 rpc_count_iostats_metrics(task,
1363 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1364 }
1365
1366 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1367 struct nfs_commit_data *cdata)
1368 {
1369 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1370 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1371 0, task->tk_start);
1372 }
1373
1374 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1375 {
1376 ff_layout_commit_prepare_common(task, data);
1377 rpc_call_start(task);
1378 }
1379
1380 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1381 {
1382 struct nfs_commit_data *wdata = data;
1383
1384 if (ff_layout_setup_sequence(wdata->ds_clp,
1385 &wdata->args.seq_args,
1386 &wdata->res.seq_res,
1387 task))
1388 return;
1389 ff_layout_commit_prepare_common(task, data);
1390 }
1391
1392 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1393 {
1394 struct nfs_commit_data *cdata = data;
1395 struct nfs_page *req;
1396 __u64 count = 0;
1397
1398 if (task->tk_status == 0) {
1399 list_for_each_entry(req, &cdata->pages, wb_list)
1400 count += req->wb_bytes;
1401 }
1402
1403 nfs4_ff_layout_stat_io_end_write(task,
1404 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1405 count, count, NFS_FILE_SYNC);
1406
1407 pnfs_generic_write_commit_done(task, data);
1408 }
1409
1410 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1411 {
1412 struct nfs_commit_data *cdata = data;
1413
1414 rpc_count_iostats_metrics(task,
1415 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1416 }
1417
1418 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1419 .rpc_call_prepare = ff_layout_read_prepare_v3,
1420 .rpc_call_done = ff_layout_read_call_done,
1421 .rpc_count_stats = ff_layout_read_count_stats,
1422 .rpc_release = pnfs_generic_rw_release,
1423 };
1424
1425 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1426 .rpc_call_prepare = ff_layout_read_prepare_v4,
1427 .rpc_call_done = ff_layout_read_call_done,
1428 .rpc_count_stats = ff_layout_read_count_stats,
1429 .rpc_release = pnfs_generic_rw_release,
1430 };
1431
1432 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1433 .rpc_call_prepare = ff_layout_write_prepare_v3,
1434 .rpc_call_done = ff_layout_write_call_done,
1435 .rpc_count_stats = ff_layout_write_count_stats,
1436 .rpc_release = pnfs_generic_rw_release,
1437 };
1438
1439 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1440 .rpc_call_prepare = ff_layout_write_prepare_v4,
1441 .rpc_call_done = ff_layout_write_call_done,
1442 .rpc_count_stats = ff_layout_write_count_stats,
1443 .rpc_release = pnfs_generic_rw_release,
1444 };
1445
1446 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1447 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1448 .rpc_call_done = ff_layout_commit_done,
1449 .rpc_count_stats = ff_layout_commit_count_stats,
1450 .rpc_release = pnfs_generic_commit_release,
1451 };
1452
1453 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1454 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1455 .rpc_call_done = ff_layout_commit_done,
1456 .rpc_count_stats = ff_layout_commit_count_stats,
1457 .rpc_release = pnfs_generic_commit_release,
1458 };
1459
1460 static enum pnfs_try_status
1461 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1462 {
1463 struct pnfs_layout_segment *lseg = hdr->lseg;
1464 struct nfs4_pnfs_ds *ds;
1465 struct rpc_clnt *ds_clnt;
1466 struct rpc_cred *ds_cred;
1467 loff_t offset = hdr->args.offset;
1468 u32 idx = hdr->pgio_mirror_idx;
1469 int vers;
1470 struct nfs_fh *fh;
1471
1472 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1473 __func__, hdr->inode->i_ino,
1474 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1475
1476 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1477 if (!ds)
1478 goto out_failed;
1479
1480 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1481 hdr->inode);
1482 if (IS_ERR(ds_clnt))
1483 goto out_failed;
1484
1485 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1486 if (IS_ERR(ds_cred))
1487 goto out_failed;
1488
1489 vers = nfs4_ff_layout_ds_version(lseg, idx);
1490
1491 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1492 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1493
1494 atomic_inc(&ds->ds_clp->cl_count);
1495 hdr->ds_clp = ds->ds_clp;
1496 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1497 if (fh)
1498 hdr->args.fh = fh;
1499 /*
1500 * Note that if we ever decide to split across DSes,
1501 * then we may need to handle dense-like offsets.
1502 */
1503 hdr->args.offset = offset;
1504 hdr->mds_offset = offset;
1505
1506 /* Perform an asynchronous read to ds */
1507 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1508 vers == 3 ? &ff_layout_read_call_ops_v3 :
1509 &ff_layout_read_call_ops_v4,
1510 0, RPC_TASK_SOFTCONN);
1511
1512 return PNFS_ATTEMPTED;
1513
1514 out_failed:
1515 if (ff_layout_has_available_ds(lseg))
1516 return PNFS_TRY_AGAIN;
1517 return PNFS_NOT_ATTEMPTED;
1518 }
1519
1520 /* Perform async writes. */
1521 static enum pnfs_try_status
1522 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1523 {
1524 struct pnfs_layout_segment *lseg = hdr->lseg;
1525 struct nfs4_pnfs_ds *ds;
1526 struct rpc_clnt *ds_clnt;
1527 struct rpc_cred *ds_cred;
1528 loff_t offset = hdr->args.offset;
1529 int vers;
1530 struct nfs_fh *fh;
1531 int idx = hdr->pgio_mirror_idx;
1532
1533 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1534 if (!ds)
1535 return PNFS_NOT_ATTEMPTED;
1536
1537 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1538 hdr->inode);
1539 if (IS_ERR(ds_clnt))
1540 return PNFS_NOT_ATTEMPTED;
1541
1542 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1543 if (IS_ERR(ds_cred))
1544 return PNFS_NOT_ATTEMPTED;
1545
1546 vers = nfs4_ff_layout_ds_version(lseg, idx);
1547
1548 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1549 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1550 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1551 vers);
1552
1553 hdr->pgio_done_cb = ff_layout_write_done_cb;
1554 atomic_inc(&ds->ds_clp->cl_count);
1555 hdr->ds_clp = ds->ds_clp;
1556 hdr->ds_commit_idx = idx;
1557 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1558 if (fh)
1559 hdr->args.fh = fh;
1560
1561 /*
1562 * Note that if we ever decide to split across DSes,
1563 * then we may need to handle dense-like offsets.
1564 */
1565 hdr->args.offset = offset;
1566
1567 /* Perform an asynchronous write */
1568 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1569 vers == 3 ? &ff_layout_write_call_ops_v3 :
1570 &ff_layout_write_call_ops_v4,
1571 sync, RPC_TASK_SOFTCONN);
1572 return PNFS_ATTEMPTED;
1573 }
1574
1575 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1576 {
1577 return i;
1578 }
1579
1580 static struct nfs_fh *
1581 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1582 {
1583 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1584
1585 /* FIXME: Assume that there is only one NFS version available
1586 * for the DS.
1587 */
1588 return &flseg->mirror_array[i]->fh_versions[0];
1589 }
1590
1591 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1592 {
1593 struct pnfs_layout_segment *lseg = data->lseg;
1594 struct nfs4_pnfs_ds *ds;
1595 struct rpc_clnt *ds_clnt;
1596 struct rpc_cred *ds_cred;
1597 u32 idx;
1598 int vers;
1599 struct nfs_fh *fh;
1600
1601 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1602 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1603 if (!ds)
1604 goto out_err;
1605
1606 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1607 data->inode);
1608 if (IS_ERR(ds_clnt))
1609 goto out_err;
1610
1611 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1612 if (IS_ERR(ds_cred))
1613 goto out_err;
1614
1615 vers = nfs4_ff_layout_ds_version(lseg, idx);
1616
1617 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1618 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1619 vers);
1620 data->commit_done_cb = ff_layout_commit_done_cb;
1621 data->cred = ds_cred;
1622 atomic_inc(&ds->ds_clp->cl_count);
1623 data->ds_clp = ds->ds_clp;
1624 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1625 if (fh)
1626 data->args.fh = fh;
1627
1628 return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1629 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1630 &ff_layout_commit_call_ops_v4,
1631 how, RPC_TASK_SOFTCONN);
1632 out_err:
1633 pnfs_generic_prepare_to_resend_writes(data);
1634 pnfs_generic_commit_release(data);
1635 return -EAGAIN;
1636 }
1637
1638 static int
1639 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1640 int how, struct nfs_commit_info *cinfo)
1641 {
1642 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1643 ff_layout_initiate_commit);
1644 }
1645
1646 static struct pnfs_ds_commit_info *
1647 ff_layout_get_ds_info(struct inode *inode)
1648 {
1649 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1650
1651 if (layout == NULL)
1652 return NULL;
1653
1654 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1655 }
1656
1657 static void
1658 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1659 {
1660 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1661 id_node));
1662 }
1663
1664 static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1665 struct xdr_stream *xdr,
1666 const struct nfs4_layoutreturn_args *args)
1667 {
1668 struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
1669 __be32 *start;
1670 int count = 0, ret = 0;
1671
1672 start = xdr_reserve_space(xdr, 4);
1673 if (unlikely(!start))
1674 return -E2BIG;
1675
1676 /* This assume we always return _ALL_ layouts */
1677 spin_lock(&hdr->plh_inode->i_lock);
1678 ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
1679 spin_unlock(&hdr->plh_inode->i_lock);
1680
1681 *start = cpu_to_be32(count);
1682
1683 return ret;
1684 }
1685
1686 /* report nothing for now */
1687 static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1688 struct xdr_stream *xdr,
1689 const struct nfs4_layoutreturn_args *args)
1690 {
1691 __be32 *p;
1692
1693 p = xdr_reserve_space(xdr, 4);
1694 if (likely(p))
1695 *p = cpu_to_be32(0);
1696 }
1697
1698 static struct nfs4_deviceid_node *
1699 ff_layout_alloc_deviceid_node(struct nfs_server *server,
1700 struct pnfs_device *pdev, gfp_t gfp_flags)
1701 {
1702 struct nfs4_ff_layout_ds *dsaddr;
1703
1704 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
1705 if (!dsaddr)
1706 return NULL;
1707 return &dsaddr->id_node;
1708 }
1709
1710 static void
1711 ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
1712 struct xdr_stream *xdr,
1713 const struct nfs4_layoutreturn_args *args)
1714 {
1715 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
1716 __be32 *start;
1717
1718 dprintk("%s: Begin\n", __func__);
1719 start = xdr_reserve_space(xdr, 4);
1720 BUG_ON(!start);
1721
1722 if (ff_layout_encode_ioerr(flo, xdr, args))
1723 goto out;
1724
1725 ff_layout_encode_iostats(flo, xdr, args);
1726 out:
1727 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1728 dprintk("%s: Return\n", __func__);
1729 }
1730
1731 static int
1732 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
1733 {
1734 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
1735
1736 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
1737 }
1738
1739 static size_t
1740 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
1741 const int buflen)
1742 {
1743 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
1744 const struct in6_addr *addr = &sin6->sin6_addr;
1745
1746 /*
1747 * RFC 4291, Section 2.2.2
1748 *
1749 * Shorthanded ANY address
1750 */
1751 if (ipv6_addr_any(addr))
1752 return snprintf(buf, buflen, "::");
1753
1754 /*
1755 * RFC 4291, Section 2.2.2
1756 *
1757 * Shorthanded loopback address
1758 */
1759 if (ipv6_addr_loopback(addr))
1760 return snprintf(buf, buflen, "::1");
1761
1762 /*
1763 * RFC 4291, Section 2.2.3
1764 *
1765 * Special presentation address format for mapped v4
1766 * addresses.
1767 */
1768 if (ipv6_addr_v4mapped(addr))
1769 return snprintf(buf, buflen, "::ffff:%pI4",
1770 &addr->s6_addr32[3]);
1771
1772 /*
1773 * RFC 4291, Section 2.2.1
1774 */
1775 return snprintf(buf, buflen, "%pI6c", addr);
1776 }
1777
1778 /* Derived from rpc_sockaddr2uaddr */
1779 static void
1780 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
1781 {
1782 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
1783 char portbuf[RPCBIND_MAXUADDRPLEN];
1784 char addrbuf[RPCBIND_MAXUADDRLEN];
1785 char *netid;
1786 unsigned short port;
1787 int len, netid_len;
1788 __be32 *p;
1789
1790 switch (sap->sa_family) {
1791 case AF_INET:
1792 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
1793 return;
1794 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1795 netid = "tcp";
1796 netid_len = 3;
1797 break;
1798 case AF_INET6:
1799 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
1800 return;
1801 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
1802 netid = "tcp6";
1803 netid_len = 4;
1804 break;
1805 default:
1806 /* we only support tcp and tcp6 */
1807 WARN_ON_ONCE(1);
1808 return;
1809 }
1810
1811 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
1812 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
1813
1814 p = xdr_reserve_space(xdr, 4 + netid_len);
1815 xdr_encode_opaque(p, netid, netid_len);
1816
1817 p = xdr_reserve_space(xdr, 4 + len);
1818 xdr_encode_opaque(p, addrbuf, len);
1819 }
1820
1821 static void
1822 ff_layout_encode_nfstime(struct xdr_stream *xdr,
1823 ktime_t t)
1824 {
1825 struct timespec64 ts;
1826 __be32 *p;
1827
1828 p = xdr_reserve_space(xdr, 12);
1829 ts = ktime_to_timespec64(t);
1830 p = xdr_encode_hyper(p, ts.tv_sec);
1831 *p++ = cpu_to_be32(ts.tv_nsec);
1832 }
1833
1834 static void
1835 ff_layout_encode_io_latency(struct xdr_stream *xdr,
1836 struct nfs4_ff_io_stat *stat)
1837 {
1838 __be32 *p;
1839
1840 p = xdr_reserve_space(xdr, 5 * 8);
1841 p = xdr_encode_hyper(p, stat->ops_requested);
1842 p = xdr_encode_hyper(p, stat->bytes_requested);
1843 p = xdr_encode_hyper(p, stat->ops_completed);
1844 p = xdr_encode_hyper(p, stat->bytes_completed);
1845 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
1846 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
1847 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
1848 }
1849
1850 static void
1851 ff_layout_encode_layoutstats(struct xdr_stream *xdr,
1852 struct nfs42_layoutstat_args *args,
1853 struct nfs42_layoutstat_devinfo *devinfo)
1854 {
1855 struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private;
1856 struct nfs4_pnfs_ds_addr *da;
1857 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
1858 struct nfs_fh *fh = &mirror->fh_versions[0];
1859 __be32 *p, *start;
1860
1861 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
1862 dprintk("%s: DS %s: encoding address %s\n",
1863 __func__, ds->ds_remotestr, da->da_remotestr);
1864 /* layoutupdate length */
1865 start = xdr_reserve_space(xdr, 4);
1866 /* netaddr4 */
1867 ff_layout_encode_netaddr(xdr, da);
1868 /* nfs_fh4 */
1869 p = xdr_reserve_space(xdr, 4 + fh->size);
1870 xdr_encode_opaque(p, fh->data, fh->size);
1871 /* ff_io_latency4 read */
1872 spin_lock(&mirror->lock);
1873 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
1874 /* ff_io_latency4 write */
1875 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
1876 spin_unlock(&mirror->lock);
1877 /* nfstime4 */
1878 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
1879 /* bool */
1880 p = xdr_reserve_space(xdr, 4);
1881 *p = cpu_to_be32(false);
1882
1883 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1884 }
1885
1886 static bool
1887 ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
1888 struct pnfs_layout_segment *pls,
1889 int *dev_count, int dev_limit)
1890 {
1891 struct nfs4_ff_layout_mirror *mirror;
1892 struct nfs4_deviceid_node *dev;
1893 struct nfs42_layoutstat_devinfo *devinfo;
1894 int i;
1895
1896 for (i = 0; i < FF_LAYOUT_MIRROR_COUNT(pls); i++) {
1897 if (*dev_count >= dev_limit)
1898 break;
1899 mirror = FF_LAYOUT_COMP(pls, i);
1900 if (!mirror || !mirror->mirror_ds)
1901 continue;
1902 dev = FF_LAYOUT_DEVID_NODE(pls, i);
1903 devinfo = &args->devinfo[*dev_count];
1904 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
1905 devinfo->offset = pls->pls_range.offset;
1906 devinfo->length = pls->pls_range.length;
1907 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
1908 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
1909 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
1910 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
1911 devinfo->layout_type = LAYOUT_FLEX_FILES;
1912 devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
1913 devinfo->layout_private = mirror;
1914 /* mirror refcount put in cleanup_layoutstats */
1915 atomic_inc(&mirror->ref);
1916
1917 ++(*dev_count);
1918 }
1919
1920 return *dev_count < dev_limit;
1921 }
1922
1923 static int
1924 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
1925 {
1926 struct pnfs_layout_segment *pls;
1927 int dev_count = 0;
1928
1929 spin_lock(&args->inode->i_lock);
1930 list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
1931 dev_count += FF_LAYOUT_MIRROR_COUNT(pls);
1932 }
1933 spin_unlock(&args->inode->i_lock);
1934 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
1935 if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
1936 dprintk("%s: truncating devinfo to limit (%d:%d)\n",
1937 __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
1938 dev_count = PNFS_LAYOUTSTATS_MAXDEV;
1939 }
1940 args->devinfo = kmalloc(dev_count * sizeof(*args->devinfo), GFP_KERNEL);
1941 if (!args->devinfo)
1942 return -ENOMEM;
1943
1944 dev_count = 0;
1945 spin_lock(&args->inode->i_lock);
1946 list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
1947 if (!ff_layout_mirror_prepare_stats(args, pls, &dev_count,
1948 PNFS_LAYOUTSTATS_MAXDEV)) {
1949 break;
1950 }
1951 }
1952 spin_unlock(&args->inode->i_lock);
1953 args->num_dev = dev_count;
1954
1955 return 0;
1956 }
1957
1958 static void
1959 ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data)
1960 {
1961 struct nfs4_ff_layout_mirror *mirror;
1962 int i;
1963
1964 for (i = 0; i < data->args.num_dev; i++) {
1965 mirror = data->args.devinfo[i].layout_private;
1966 data->args.devinfo[i].layout_private = NULL;
1967 ff_layout_put_mirror(mirror);
1968 }
1969 }
1970
1971 static struct pnfs_layoutdriver_type flexfilelayout_type = {
1972 .id = LAYOUT_FLEX_FILES,
1973 .name = "LAYOUT_FLEX_FILES",
1974 .owner = THIS_MODULE,
1975 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
1976 .free_layout_hdr = ff_layout_free_layout_hdr,
1977 .alloc_lseg = ff_layout_alloc_lseg,
1978 .free_lseg = ff_layout_free_lseg,
1979 .pg_read_ops = &ff_layout_pg_read_ops,
1980 .pg_write_ops = &ff_layout_pg_write_ops,
1981 .get_ds_info = ff_layout_get_ds_info,
1982 .free_deviceid_node = ff_layout_free_deviceid_node,
1983 .mark_request_commit = pnfs_layout_mark_request_commit,
1984 .clear_request_commit = pnfs_generic_clear_request_commit,
1985 .scan_commit_lists = pnfs_generic_scan_commit_lists,
1986 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
1987 .commit_pagelist = ff_layout_commit_pagelist,
1988 .read_pagelist = ff_layout_read_pagelist,
1989 .write_pagelist = ff_layout_write_pagelist,
1990 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
1991 .encode_layoutreturn = ff_layout_encode_layoutreturn,
1992 .sync = pnfs_nfs_generic_sync,
1993 .prepare_layoutstats = ff_layout_prepare_layoutstats,
1994 .cleanup_layoutstats = ff_layout_cleanup_layoutstats,
1995 };
1996
1997 static int __init nfs4flexfilelayout_init(void)
1998 {
1999 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2000 __func__);
2001 return pnfs_register_layoutdriver(&flexfilelayout_type);
2002 }
2003
2004 static void __exit nfs4flexfilelayout_exit(void)
2005 {
2006 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2007 __func__);
2008 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2009 }
2010
2011 MODULE_ALIAS("nfs-layouttype4-4");
2012
2013 MODULE_LICENSE("GPL");
2014 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2015
2016 module_init(nfs4flexfilelayout_init);
2017 module_exit(nfs4flexfilelayout_exit);
Linux kernel - Deliverables
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