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Merge branch 'layoutstats'
[mirror_ubuntu-hirsute-kernel.git] / fs / nfs / flexfilelayout / flexfilelayout.c
CommitLineData
d67ae825
TH		 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>
d67ae825
TH		 14
15#include "flexfilelayout.h"
16#include "../nfs4session.h"
40c64c26 17#include "../nfs4idmap.h"
d67ae825
TH		 18#include "../internal.h"
19#include "../delegation.h"
20#include "../nfs4trace.h"
21#include "../iostat.h"
22#include "../nfs.h"
ad4dc53e 23#include "../nfs42.h"
d67ae825
TH		 24
25#define NFSDBG_FACILITY NFSDBG_PNFS_LD
26
27#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
28
29static struct pnfs_layout_hdr *
30ff_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
42static void
43ff_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
55static 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
68static 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
80static 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 */
111static int
112decode_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
138static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
139{
140 int i;
141
142 if (fls->mirror_array) {
143 for (i = 0; i < fls->mirror_array_cnt; i++) {
144 /* normally mirror_ds is freed in
145 * .free_deviceid_node but we still do it here
146 * for .alloc_lseg error path */
147 if (fls->mirror_array[i]) {
148 kfree(fls->mirror_array[i]->fh_versions);
149 nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
150 kfree(fls->mirror_array[i]);
151 }
152 }
153 kfree(fls->mirror_array);
154 fls->mirror_array = NULL;
155 }
156}
157
158static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
159{
160 int ret = 0;
161
162 dprintk("--> %s\n", __func__);
163
164 /* FIXME: remove this check when layout segment support is added */
165 if (lgr->range.offset != 0 ||
166 lgr->range.length != NFS4_MAX_UINT64) {
167 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
168 __func__);
169 ret = -EINVAL;
170 }
171
172 dprintk("--> %s returns %d\n", __func__, ret);
173 return ret;
174}
175
176static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
177{
178 if (fls) {
179 ff_layout_free_mirror_array(fls);
180 kfree(fls);
181 }
182}
183
184static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
185{
d67ae825
TH		 186 int i, j;
187
188 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
189 for (j = i + 1; j < fls->mirror_array_cnt; j++)
190 if (fls->mirror_array[i]->efficiency <
455b6ee6
FF		 191 fls->mirror_array[j]->efficiency)
192 swap(fls->mirror_array[i],
193 fls->mirror_array[j]);
d67ae825
TH		 194 }
195}
196
197static struct pnfs_layout_segment *
198ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
199 struct nfs4_layoutget_res *lgr,
200 gfp_t gfp_flags)
201{
202 struct pnfs_layout_segment *ret;
203 struct nfs4_ff_layout_segment *fls = NULL;
204 struct xdr_stream stream;
205 struct xdr_buf buf;
206 struct page *scratch;
207 u64 stripe_unit;
208 u32 mirror_array_cnt;
209 __be32 *p;
210 int i, rc;
211
212 dprintk("--> %s\n", __func__);
213 scratch = alloc_page(gfp_flags);
214 if (!scratch)
215 return ERR_PTR(-ENOMEM);
216
217 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
218 lgr->layoutp->len);
219 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
220
221 /* stripe unit and mirror_array_cnt */
222 rc = -EIO;
223 p = xdr_inline_decode(&stream, 8 + 4);
224 if (!p)
225 goto out_err_free;
226
227 p = xdr_decode_hyper(p, &stripe_unit);
228 mirror_array_cnt = be32_to_cpup(p++);
229 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
230 stripe_unit, mirror_array_cnt);
231
232 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
233 mirror_array_cnt == 0)
234 goto out_err_free;
235
236 rc = -ENOMEM;
237 fls = kzalloc(sizeof(*fls), gfp_flags);
238 if (!fls)
239 goto out_err_free;
240
241 fls->mirror_array_cnt = mirror_array_cnt;
242 fls->stripe_unit = stripe_unit;
243 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
244 sizeof(fls->mirror_array[0]), gfp_flags);
245 if (fls->mirror_array == NULL)
246 goto out_err_free;
247
248 for (i = 0; i < fls->mirror_array_cnt; i++) {
249 struct nfs4_deviceid devid;
250 struct nfs4_deviceid_node *idnode;
251 u32 ds_count;
252 u32 fh_count;
253 int j;
254
255 rc = -EIO;
256 p = xdr_inline_decode(&stream, 4);
257 if (!p)
258 goto out_err_free;
259 ds_count = be32_to_cpup(p);
260
261 /* FIXME: allow for striping? */
262 if (ds_count != 1)
263 goto out_err_free;
264
265 fls->mirror_array[i] =
266 kzalloc(sizeof(struct nfs4_ff_layout_mirror),
267 gfp_flags);
268 if (fls->mirror_array[i] == NULL) {
269 rc = -ENOMEM;
270 goto out_err_free;
271 }
272
273 spin_lock_init(&fls->mirror_array[i]->lock);
274 fls->mirror_array[i]->ds_count = ds_count;
27c43064 275 fls->mirror_array[i]->lseg = &fls->generic_hdr;
d67ae825
TH		 276
277 /* deviceid */
278 rc = decode_deviceid(&stream, &devid);
279 if (rc)
280 goto out_err_free;
281
282 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
283 &devid, lh->plh_lc_cred,
284 gfp_flags);
285 /*
286 * upon success, mirror_ds is allocated by previous
287 * getdeviceinfo, or newly by .alloc_deviceid_node
288 * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
289 */
290 if (idnode)
291 fls->mirror_array[i]->mirror_ds =
292 FF_LAYOUT_MIRROR_DS(idnode);
293 else
294 goto out_err_free;
295
296 /* efficiency */
297 rc = -EIO;
298 p = xdr_inline_decode(&stream, 4);
299 if (!p)
300 goto out_err_free;
301 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
302
303 /* stateid */
304 rc = decode_stateid(&stream, &fls->mirror_array[i]->stateid);
305 if (rc)
306 goto out_err_free;
307
308 /* fh */
309 p = xdr_inline_decode(&stream, 4);
310 if (!p)
311 goto out_err_free;
312 fh_count = be32_to_cpup(p);
313
314 fls->mirror_array[i]->fh_versions =
315 kzalloc(fh_count * sizeof(struct nfs_fh),
316 gfp_flags);
317 if (fls->mirror_array[i]->fh_versions == NULL) {
318 rc = -ENOMEM;
319 goto out_err_free;
320 }
321
322 for (j = 0; j < fh_count; j++) {
323 rc = decode_nfs_fh(&stream,
324 &fls->mirror_array[i]->fh_versions[j]);
325 if (rc)
326 goto out_err_free;
327 }
328
329 fls->mirror_array[i]->fh_versions_cnt = fh_count;
330
331 /* user */
332 rc = decode_name(&stream, &fls->mirror_array[i]->uid);
333 if (rc)
334 goto out_err_free;
335
336 /* group */
337 rc = decode_name(&stream, &fls->mirror_array[i]->gid);
338 if (rc)
339 goto out_err_free;
340
341 dprintk("%s: uid %d gid %d\n", __func__,
342 fls->mirror_array[i]->uid,
343 fls->mirror_array[i]->gid);
344 }
345
346 ff_layout_sort_mirrors(fls);
347 rc = ff_layout_check_layout(lgr);
348 if (rc)
349 goto out_err_free;
350
351 ret = &fls->generic_hdr;
352 dprintk("<-- %s (success)\n", __func__);
353out_free_page:
354 __free_page(scratch);
355 return ret;
356out_err_free:
357 _ff_layout_free_lseg(fls);
358 ret = ERR_PTR(rc);
359 dprintk("<-- %s (%d)\n", __func__, rc);
360 goto out_free_page;
361}
362
363static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
364{
365 struct pnfs_layout_segment *lseg;
366
367 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
368 if (lseg->pls_range.iomode == IOMODE_RW)
369 return true;
370
371 return false;
372}
373
374static void
375ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
376{
377 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
378 int i;
379
380 dprintk("--> %s\n", __func__);
381
382 for (i = 0; i < fls->mirror_array_cnt; i++) {
383 if (fls->mirror_array[i]) {
384 nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
385 fls->mirror_array[i]->mirror_ds = NULL;
386 if (fls->mirror_array[i]->cred) {
387 put_rpccred(fls->mirror_array[i]->cred);
388 fls->mirror_array[i]->cred = NULL;
389 }
390 }
391 }
392
393 if (lseg->pls_range.iomode == IOMODE_RW) {
394 struct nfs4_flexfile_layout *ffl;
395 struct inode *inode;
396
397 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
398 inode = ffl->generic_hdr.plh_inode;
399 spin_lock(&inode->i_lock);
400 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
401 ffl->commit_info.nbuckets = 0;
402 kfree(ffl->commit_info.buckets);
403 ffl->commit_info.buckets = NULL;
404 }
405 spin_unlock(&inode->i_lock);
406 }
407 _ff_layout_free_lseg(fls);
408}
409
410/* Return 1 until we have multiple lsegs support */
411static int
412ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
413{
414 return 1;
415}
416
abcb7bfc
TM		 417static void
418nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer)
419{
9bbd9bb4
PT		 420 /* first IO request? */
421 if (atomic_inc_return(&timer->n_ops) == 1) {
422 timer->start_time = ktime_get();
abcb7bfc
TM		 423 }
424}
425
426static ktime_t
427nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer)
428{
429 ktime_t start, now;
430
9bbd9bb4
PT		 431 if (atomic_dec_return(&timer->n_ops) < 0)
432 WARN_ON_ONCE(1);
433
abcb7bfc 434 now = ktime_get();
9bbd9bb4
PT		 435 start = timer->start_time;
436 timer->start_time = now;
abcb7bfc
TM		 437 return ktime_sub(now, start);
438}
439
440static ktime_t
441nfs4_ff_layout_calc_completion_time(struct rpc_task *task)
442{
443 return ktime_sub(ktime_get(), task->tk_start);
444}
445
97ba375b 446static bool
d983803d
PT		 447nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
448 struct nfs4_ff_layoutstat *layoutstat)
abcb7bfc 449{
d983803d 450 static const ktime_t notime = {0};
97ba375b 451 ktime_t now = ktime_get();
d983803d 452
abcb7bfc 453 nfs4_ff_start_busy_timer(&layoutstat->busy_timer);
9bbd9bb4
PT		 454 if (ktime_equal(mirror->start_time, notime))
455 mirror->start_time = now;
456 if (ktime_equal(mirror->last_report_time, notime))
457 mirror->last_report_time = now;
97ba375b
PT		 458 if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >=
459 FF_LAYOUTSTATS_REPORT_INTERVAL) {
460 mirror->last_report_time = now;
461 return true;
462 }
463
464 return false;
abcb7bfc
TM		 465}
466
467static void
468nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
469 __u64 requested)
470{
471 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
472
473 iostat->ops_requested++;
474 iostat->bytes_requested += requested;
475}
476
477static void
478nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
479 __u64 requested,
480 __u64 completed,
481 ktime_t time_completed)
482{
483 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
484 ktime_t timer;
485
486 iostat->ops_completed++;
487 iostat->bytes_completed += completed;
488 iostat->bytes_not_delivered += requested - completed;
489
490 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer);
491 iostat->total_busy_time =
492 ktime_add(iostat->total_busy_time, timer);
493 iostat->aggregate_completion_time =
494 ktime_add(iostat->aggregate_completion_time, time_completed);
495}
496
497static void
498nfs4_ff_layout_stat_io_start_read(struct nfs4_ff_layout_mirror *mirror,
499 __u64 requested)
500{
97ba375b
PT		 501 bool report;
502
abcb7bfc 503 spin_lock(&mirror->lock);
97ba375b 504 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat);
abcb7bfc
TM		 505 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
506 spin_unlock(&mirror->lock);
97ba375b
PT		 507
508 if (report)
509 pnfs_report_layoutstat(mirror->lseg->pls_layout->plh_inode);
abcb7bfc
TM		 510}
511
512static void
513nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
514 struct nfs4_ff_layout_mirror *mirror,
515 __u64 requested,
516 __u64 completed)
517{
518 spin_lock(&mirror->lock);
519 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
520 requested, completed,
521 nfs4_ff_layout_calc_completion_time(task));
522 spin_unlock(&mirror->lock);
523}
524
525static void
526nfs4_ff_layout_stat_io_start_write(struct nfs4_ff_layout_mirror *mirror,
527 __u64 requested)
528{
97ba375b
PT		 529 bool report;
530
abcb7bfc 531 spin_lock(&mirror->lock);
97ba375b 532 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat);
abcb7bfc
TM		 533 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
534 spin_unlock(&mirror->lock);
97ba375b
PT		 535
536 if (report)
537 pnfs_report_layoutstat(mirror->lseg->pls_layout->plh_inode);
abcb7bfc
TM		 538}
539
540static void
541nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
542 struct nfs4_ff_layout_mirror *mirror,
543 __u64 requested,
544 __u64 completed,
545 enum nfs3_stable_how committed)
546{
547 if (committed == NFS_UNSTABLE)
548 requested = completed = 0;
549
550 spin_lock(&mirror->lock);
551 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
552 requested, completed,
553 nfs4_ff_layout_calc_completion_time(task));
554 spin_unlock(&mirror->lock);
555}
556
d67ae825
TH		 557static int
558ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
559 struct nfs_commit_info *cinfo,
560 gfp_t gfp_flags)
561{
562 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
563 struct pnfs_commit_bucket *buckets;
564 int size;
565
566 if (cinfo->ds->nbuckets != 0) {
567 /* This assumes there is only one RW lseg per file.
568 * To support multiple lseg per file, we need to
569 * change struct pnfs_commit_bucket to allow dynamic
570 * increasing nbuckets.
571 */
572 return 0;
573 }
574
575 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
576
577 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
578 gfp_flags);
579 if (!buckets)
580 return -ENOMEM;
581 else {
582 int i;
583
584 spin_lock(cinfo->lock);
585 if (cinfo->ds->nbuckets != 0)
586 kfree(buckets);
587 else {
588 cinfo->ds->buckets = buckets;
589 cinfo->ds->nbuckets = size;
590 for (i = 0; i < size; i++) {
591 INIT_LIST_HEAD(&buckets[i].written);
592 INIT_LIST_HEAD(&buckets[i].committing);
593 /* mark direct verifier as unset */
594 buckets[i].direct_verf.committed =
595 NFS_INVALID_STABLE_HOW;
596 }
597 }
598 spin_unlock(cinfo->lock);
599 return 0;
600 }
601}
602
603static struct nfs4_pnfs_ds *
604ff_layout_choose_best_ds_for_read(struct nfs_pageio_descriptor *pgio,
605 int *best_idx)
606{
607 struct nfs4_ff_layout_segment *fls;
608 struct nfs4_pnfs_ds *ds;
609 int idx;
610
611 fls = FF_LAYOUT_LSEG(pgio->pg_lseg);
612 /* mirrors are sorted by efficiency */
613 for (idx = 0; idx < fls->mirror_array_cnt; idx++) {
614 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, idx, false);
615 if (ds) {
616 *best_idx = idx;
617 return ds;
618 }
619 }
620
621 return NULL;
622}
623
624static void
625ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
626 struct nfs_page *req)
627{
628 struct nfs_pgio_mirror *pgm;
629 struct nfs4_ff_layout_mirror *mirror;
630 struct nfs4_pnfs_ds *ds;
631 int ds_idx;
632
633 /* Use full layout for now */
634 if (!pgio->pg_lseg)
635 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
636 req->wb_context,
637 0,
638 NFS4_MAX_UINT64,
639 IOMODE_READ,
640 GFP_KERNEL);
641 /* If no lseg, fall back to read through mds */
642 if (pgio->pg_lseg == NULL)
643 goto out_mds;
644
645 ds = ff_layout_choose_best_ds_for_read(pgio, &ds_idx);
646 if (!ds)
647 goto out_mds;
648 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
649
650 pgio->pg_mirror_idx = ds_idx;
651
652 /* read always uses only one mirror - idx 0 for pgio layer */
653 pgm = &pgio->pg_mirrors[0];
654 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
655
656 return;
657out_mds:
658 pnfs_put_lseg(pgio->pg_lseg);
659 pgio->pg_lseg = NULL;
660 nfs_pageio_reset_read_mds(pgio);
661}
662
663static void
664ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
665 struct nfs_page *req)
666{
667 struct nfs4_ff_layout_mirror *mirror;
668 struct nfs_pgio_mirror *pgm;
669 struct nfs_commit_info cinfo;
670 struct nfs4_pnfs_ds *ds;
671 int i;
672 int status;
673
674 if (!pgio->pg_lseg)
675 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
676 req->wb_context,
677 0,
678 NFS4_MAX_UINT64,
679 IOMODE_RW,
680 GFP_NOFS);
681 /* If no lseg, fall back to write through mds */
682 if (pgio->pg_lseg == NULL)
683 goto out_mds;
684
685 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
686 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
687 if (status < 0)
688 goto out_mds;
689
690 /* Use a direct mapping of ds_idx to pgio mirror_idx */
691 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
692 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
693 goto out_mds;
694
695 for (i = 0; i < pgio->pg_mirror_count; i++) {
696 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
697 if (!ds)
698 goto out_mds;
699 pgm = &pgio->pg_mirrors[i];
700 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
701 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
702 }
703
704 return;
705
706out_mds:
707 pnfs_put_lseg(pgio->pg_lseg);
708 pgio->pg_lseg = NULL;
709 nfs_pageio_reset_write_mds(pgio);
710}
711
712static unsigned int
713ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
714 struct nfs_page *req)
715{
716 if (!pgio->pg_lseg)
717 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
718 req->wb_context,
719 0,
720 NFS4_MAX_UINT64,
721 IOMODE_RW,
722 GFP_NOFS);
723 if (pgio->pg_lseg)
724 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
725
726 /* no lseg means that pnfs is not in use, so no mirroring here */
727 pnfs_put_lseg(pgio->pg_lseg);
728 pgio->pg_lseg = NULL;
729 nfs_pageio_reset_write_mds(pgio);
730 return 1;
731}
732
733static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
734 .pg_init = ff_layout_pg_init_read,
735 .pg_test = pnfs_generic_pg_test,
736 .pg_doio = pnfs_generic_pg_readpages,
737 .pg_cleanup = pnfs_generic_pg_cleanup,
738};
739
740static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
741 .pg_init = ff_layout_pg_init_write,
742 .pg_test = pnfs_generic_pg_test,
743 .pg_doio = pnfs_generic_pg_writepages,
744 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
745 .pg_cleanup = pnfs_generic_pg_cleanup,
746};
747
748static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
749{
750 struct rpc_task *task = &hdr->task;
751
752 pnfs_layoutcommit_inode(hdr->inode, false);
753
754 if (retry_pnfs) {
755 dprintk("%s Reset task %5u for i/o through pNFS "
756 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
757 hdr->task.tk_pid,
758 hdr->inode->i_sb->s_id,
759 (unsigned long long)NFS_FILEID(hdr->inode),
760 hdr->args.count,
761 (unsigned long long)hdr->args.offset);
762
763 if (!hdr->dreq) {
764 struct nfs_open_context *ctx;
765
766 ctx = nfs_list_entry(hdr->pages.next)->wb_context;
767 set_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
768 hdr->completion_ops->error_cleanup(&hdr->pages);
769 } else {
770 nfs_direct_set_resched_writes(hdr->dreq);
771 /* fake unstable write to let common nfs resend pages */
772 hdr->verf.committed = NFS_UNSTABLE;
773 hdr->good_bytes = 0;
774 }
775 return;
776 }
777
778 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
779 dprintk("%s Reset task %5u for i/o through MDS "
780 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
781 hdr->task.tk_pid,
782 hdr->inode->i_sb->s_id,
783 (unsigned long long)NFS_FILEID(hdr->inode),
784 hdr->args.count,
785 (unsigned long long)hdr->args.offset);
786
787 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
788 }
789}
790
791static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
792{
793 struct rpc_task *task = &hdr->task;
794
795 pnfs_layoutcommit_inode(hdr->inode, false);
796
797 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
798 dprintk("%s Reset task %5u for i/o through MDS "
799 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
800 hdr->task.tk_pid,
801 hdr->inode->i_sb->s_id,
802 (unsigned long long)NFS_FILEID(hdr->inode),
803 hdr->args.count,
804 (unsigned long long)hdr->args.offset);
805
806 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
807 }
808}
809
810static int ff_layout_async_handle_error_v4(struct rpc_task *task,
811 struct nfs4_state *state,
812 struct nfs_client *clp,
813 struct pnfs_layout_segment *lseg,
814 int idx)
815{
816 struct pnfs_layout_hdr *lo = lseg->pls_layout;
817 struct inode *inode = lo->plh_inode;
818 struct nfs_server *mds_server = NFS_SERVER(inode);
819
820 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
821 struct nfs_client *mds_client = mds_server->nfs_client;
822 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
823
824 if (task->tk_status >= 0)
825 return 0;
826
827 switch (task->tk_status) {
828 /* MDS state errors */
829 case -NFS4ERR_DELEG_REVOKED:
830 case -NFS4ERR_ADMIN_REVOKED:
831 case -NFS4ERR_BAD_STATEID:
832 if (state == NULL)
833 break;
834 nfs_remove_bad_delegation(state->inode);
835 case -NFS4ERR_OPENMODE:
836 if (state == NULL)
837 break;
838 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
839 goto out_bad_stateid;
840 goto wait_on_recovery;
841 case -NFS4ERR_EXPIRED:
842 if (state != NULL) {
843 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
844 goto out_bad_stateid;
845 }
846 nfs4_schedule_lease_recovery(mds_client);
847 goto wait_on_recovery;
848 /* DS session errors */
849 case -NFS4ERR_BADSESSION:
850 case -NFS4ERR_BADSLOT:
851 case -NFS4ERR_BAD_HIGH_SLOT:
852 case -NFS4ERR_DEADSESSION:
853 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
854 case -NFS4ERR_SEQ_FALSE_RETRY:
855 case -NFS4ERR_SEQ_MISORDERED:
856 dprintk("%s ERROR %d, Reset session. Exchangeid "
857 "flags 0x%x\n", __func__, task->tk_status,
858 clp->cl_exchange_flags);
859 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
860 break;
861 case -NFS4ERR_DELAY:
862 case -NFS4ERR_GRACE:
863 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
864 break;
865 case -NFS4ERR_RETRY_UNCACHED_REP:
866 break;
867 /* Invalidate Layout errors */
868 case -NFS4ERR_PNFS_NO_LAYOUT:
869 case -ESTALE: /* mapped NFS4ERR_STALE */
870 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
871 case -EISDIR: /* mapped NFS4ERR_ISDIR */
872 case -NFS4ERR_FHEXPIRED:
873 case -NFS4ERR_WRONG_TYPE:
874 dprintk("%s Invalid layout error %d\n", __func__,
875 task->tk_status);
876 /*
877 * Destroy layout so new i/o will get a new layout.
878 * Layout will not be destroyed until all current lseg
879 * references are put. Mark layout as invalid to resend failed
880 * i/o and all i/o waiting on the slot table to the MDS until
881 * layout is destroyed and a new valid layout is obtained.
882 */
883 pnfs_destroy_layout(NFS_I(inode));
884 rpc_wake_up(&tbl->slot_tbl_waitq);
885 goto reset;
886 /* RPC connection errors */
887 case -ECONNREFUSED:
888 case -EHOSTDOWN:
889 case -EHOSTUNREACH:
890 case -ENETUNREACH:
891 case -EIO:
892 case -ETIMEDOUT:
893 case -EPIPE:
894 dprintk("%s DS connection error %d\n", __func__,
895 task->tk_status);
896 nfs4_mark_deviceid_unavailable(devid);
897 rpc_wake_up(&tbl->slot_tbl_waitq);
898 /* fall through */
899 default:
900 if (ff_layout_has_available_ds(lseg))
901 return -NFS4ERR_RESET_TO_PNFS;
902reset:
903 dprintk("%s Retry through MDS. Error %d\n", __func__,
904 task->tk_status);
905 return -NFS4ERR_RESET_TO_MDS;
906 }
907out:
908 task->tk_status = 0;
909 return -EAGAIN;
910out_bad_stateid:
911 task->tk_status = -EIO;
912 return 0;
913wait_on_recovery:
914 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
915 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
916 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
917 goto out;
918}
919
920/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
921static int ff_layout_async_handle_error_v3(struct rpc_task *task,
922 struct pnfs_layout_segment *lseg,
923 int idx)
924{
925 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
926
927 if (task->tk_status >= 0)
928 return 0;
929
930 if (task->tk_status != -EJUKEBOX) {
931 dprintk("%s DS connection error %d\n", __func__,
932 task->tk_status);
933 nfs4_mark_deviceid_unavailable(devid);
934 if (ff_layout_has_available_ds(lseg))
935 return -NFS4ERR_RESET_TO_PNFS;
936 else
937 return -NFS4ERR_RESET_TO_MDS;
938 }
939
940 if (task->tk_status == -EJUKEBOX)
941 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
942 task->tk_status = 0;
943 rpc_restart_call(task);
944 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
945 return -EAGAIN;
946}
947
948static int ff_layout_async_handle_error(struct rpc_task *task,
949 struct nfs4_state *state,
950 struct nfs_client *clp,
951 struct pnfs_layout_segment *lseg,
952 int idx)
953{
954 int vers = clp->cl_nfs_mod->rpc_vers->number;
955
956 switch (vers) {
957 case 3:
958 return ff_layout_async_handle_error_v3(task, lseg, idx);
959 case 4:
960 return ff_layout_async_handle_error_v4(task, state, clp,
961 lseg, idx);
962 default:
963 /* should never happen */
964 WARN_ON_ONCE(1);
965 return 0;
966 }
967}
968
969static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
970 int idx, u64 offset, u64 length,
971 u32 status, int opnum)
972{
973 struct nfs4_ff_layout_mirror *mirror;
974 int err;
975
976 mirror = FF_LAYOUT_COMP(lseg, idx);
977 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
978 mirror, offset, length, status, opnum,
979 GFP_NOIO);
980 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
981}
982
983/* NFS_PROTO call done callback routines */
984
985static int ff_layout_read_done_cb(struct rpc_task *task,
986 struct nfs_pgio_header *hdr)
987{
988 struct inode *inode;
989 int err;
990
991 trace_nfs4_pnfs_read(hdr, task->tk_status);
992 if (task->tk_status == -ETIMEDOUT && !hdr->res.op_status)
993 hdr->res.op_status = NFS4ERR_NXIO;
994 if (task->tk_status < 0 && hdr->res.op_status)
995 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
996 hdr->args.offset, hdr->args.count,
997 hdr->res.op_status, OP_READ);
998 err = ff_layout_async_handle_error(task, hdr->args.context->state,
999 hdr->ds_clp, hdr->lseg,
1000 hdr->pgio_mirror_idx);
1001
1002 switch (err) {
1003 case -NFS4ERR_RESET_TO_PNFS:
1004 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1005 &hdr->lseg->pls_layout->plh_flags);
1006 pnfs_read_resend_pnfs(hdr);
1007 return task->tk_status;
1008 case -NFS4ERR_RESET_TO_MDS:
1009 inode = hdr->lseg->pls_layout->plh_inode;
1010 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1011 ff_layout_reset_read(hdr);
1012 return task->tk_status;
1013 case -EAGAIN:
1014 rpc_restart_call_prepare(task);
1015 return -EAGAIN;
1016 }
1017
1018 return 0;
1019}
1020
1021/*
1022 * We reference the rpc_cred of the first WRITE that triggers the need for
1023 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1024 * rfc5661 is not clear about which credential should be used.
1025 *
1026 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1027 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1028 * we always send layoutcommit after DS writes.
1029 */
1030static void
1031ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
1032{
67af7611
TM		 1033 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1034 hdr->mds_offset + hdr->res.count);
d67ae825
TH		 1035 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
1036 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
1037}
1038
1039static bool
1040ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx)
1041{
1042 /* No mirroring for now */
1043 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1044
1045 return ff_layout_test_devid_unavailable(node);
1046}
1047
1048static int ff_layout_read_prepare_common(struct rpc_task *task,
1049 struct nfs_pgio_header *hdr)
1050{
abcb7bfc
TM		 1051 nfs4_ff_layout_stat_io_start_read(
1052 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1053 hdr->args.count);
1054
d67ae825
TH		 1055 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1056 rpc_exit(task, -EIO);
1057 return -EIO;
1058 }
1059 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1060 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
1061 if (ff_layout_has_available_ds(hdr->lseg))
1062 pnfs_read_resend_pnfs(hdr);
1063 else
1064 ff_layout_reset_read(hdr);
1065 rpc_exit(task, 0);
1066 return -EAGAIN;
1067 }
1068 hdr->pgio_done_cb = ff_layout_read_done_cb;
1069
1070 return 0;
1071}
1072
1073/*
1074 * Call ops for the async read/write cases
1075 * In the case of dense layouts, the offset needs to be reset to its
1076 * original value.
1077 */
1078static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1079{
1080 struct nfs_pgio_header *hdr = data;
1081
1082 if (ff_layout_read_prepare_common(task, hdr))
1083 return;
1084
1085 rpc_call_start(task);
1086}
1087
1088static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1089 struct nfs4_sequence_args *args,
1090 struct nfs4_sequence_res *res,
1091 struct rpc_task *task)
1092{
1093 if (ds_clp->cl_session)
1094 return nfs41_setup_sequence(ds_clp->cl_session,
1095 args,
1096 res,
1097 task);
1098 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1099 args,
1100 res,
1101 task);
1102}
1103
1104static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1105{
1106 struct nfs_pgio_header *hdr = data;
1107
d67ae825
TH		 1108 if (ff_layout_setup_sequence(hdr->ds_clp,
1109 &hdr->args.seq_args,
1110 &hdr->res.seq_res,
1111 task))
1112 return;
1113
abcb7bfc
TM		 1114 if (ff_layout_read_prepare_common(task, hdr))
1115 return;
1116
d67ae825
TH		 1117 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1118 hdr->args.lock_context, FMODE_READ) == -EIO)
1119 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1120}
1121
1122static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1123{
1124 struct nfs_pgio_header *hdr = data;
1125
1126 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1127
abcb7bfc
TM		 1128 nfs4_ff_layout_stat_io_end_read(task,
1129 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1130 hdr->args.count, hdr->res.count);
1131
d67ae825
TH		 1132 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1133 task->tk_status == 0) {
1134 nfs4_sequence_done(task, &hdr->res.seq_res);
1135 return;
1136 }
1137
1138 /* Note this may cause RPC to be resent */
1139 hdr->mds_ops->rpc_call_done(task, hdr);
1140}
1141
1142static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1143{
1144 struct nfs_pgio_header *hdr = data;
1145
1146 rpc_count_iostats_metrics(task,
1147 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1148}
1149
1150static int ff_layout_write_done_cb(struct rpc_task *task,
1151 struct nfs_pgio_header *hdr)
1152{
1153 struct inode *inode;
1154 int err;
1155
1156 trace_nfs4_pnfs_write(hdr, task->tk_status);
1157 if (task->tk_status == -ETIMEDOUT && !hdr->res.op_status)
1158 hdr->res.op_status = NFS4ERR_NXIO;
1159 if (task->tk_status < 0 && hdr->res.op_status)
1160 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1161 hdr->args.offset, hdr->args.count,
1162 hdr->res.op_status, OP_WRITE);
1163 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1164 hdr->ds_clp, hdr->lseg,
1165 hdr->pgio_mirror_idx);
1166
1167 switch (err) {
1168 case -NFS4ERR_RESET_TO_PNFS:
1169 case -NFS4ERR_RESET_TO_MDS:
1170 inode = hdr->lseg->pls_layout->plh_inode;
1171 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1172 if (err == -NFS4ERR_RESET_TO_PNFS) {
1173 pnfs_set_retry_layoutget(hdr->lseg->pls_layout);
1174 ff_layout_reset_write(hdr, true);
1175 } else {
1176 pnfs_clear_retry_layoutget(hdr->lseg->pls_layout);
1177 ff_layout_reset_write(hdr, false);
1178 }
1179 return task->tk_status;
1180 case -EAGAIN:
1181 rpc_restart_call_prepare(task);
1182 return -EAGAIN;
1183 }
1184
1185 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1186 hdr->res.verf->committed == NFS_DATA_SYNC)
1187 ff_layout_set_layoutcommit(hdr);
1188
1189 return 0;
1190}
1191
1192static int ff_layout_commit_done_cb(struct rpc_task *task,
1193 struct nfs_commit_data *data)
1194{
1195 struct inode *inode;
1196 int err;
1197
1198 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1199 if (task->tk_status == -ETIMEDOUT && !data->res.op_status)
1200 data->res.op_status = NFS4ERR_NXIO;
1201 if (task->tk_status < 0 && data->res.op_status)
1202 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1203 data->args.offset, data->args.count,
1204 data->res.op_status, OP_COMMIT);
1205 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1206 data->lseg, data->ds_commit_index);
1207
1208 switch (err) {
1209 case -NFS4ERR_RESET_TO_PNFS:
1210 case -NFS4ERR_RESET_TO_MDS:
1211 inode = data->lseg->pls_layout->plh_inode;
1212 pnfs_error_mark_layout_for_return(inode, data->lseg);
1213 if (err == -NFS4ERR_RESET_TO_PNFS)
1214 pnfs_set_retry_layoutget(data->lseg->pls_layout);
1215 else
1216 pnfs_clear_retry_layoutget(data->lseg->pls_layout);
1217 pnfs_generic_prepare_to_resend_writes(data);
1218 return -EAGAIN;
1219 case -EAGAIN:
1220 rpc_restart_call_prepare(task);
1221 return -EAGAIN;
1222 }
1223
1224 if (data->verf.committed == NFS_UNSTABLE)
67af7611 1225 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1226
1227 return 0;
1228}
1229
1230static int ff_layout_write_prepare_common(struct rpc_task *task,
1231 struct nfs_pgio_header *hdr)
1232{
abcb7bfc
TM		 1233 nfs4_ff_layout_stat_io_start_write(
1234 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1235 hdr->args.count);
1236
d67ae825
TH		 1237 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1238 rpc_exit(task, -EIO);
1239 return -EIO;
1240 }
1241
1242 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1243 bool retry_pnfs;
1244
1245 retry_pnfs = ff_layout_has_available_ds(hdr->lseg);
1246 dprintk("%s task %u reset io to %s\n", __func__,
1247 task->tk_pid, retry_pnfs ? "pNFS" : "MDS");
1248 ff_layout_reset_write(hdr, retry_pnfs);
1249 rpc_exit(task, 0);
1250 return -EAGAIN;
1251 }
1252
1253 return 0;
1254}
1255
1256static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1257{
1258 struct nfs_pgio_header *hdr = data;
1259
1260 if (ff_layout_write_prepare_common(task, hdr))
1261 return;
1262
1263 rpc_call_start(task);
1264}
1265
1266static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1267{
1268 struct nfs_pgio_header *hdr = data;
1269
d67ae825
TH		 1270 if (ff_layout_setup_sequence(hdr->ds_clp,
1271 &hdr->args.seq_args,
1272 &hdr->res.seq_res,
1273 task))
1274 return;
1275
abcb7bfc
TM		 1276 if (ff_layout_write_prepare_common(task, hdr))
1277 return;
1278
d67ae825
TH		 1279 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1280 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1281 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1282}
1283
1284static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1285{
1286 struct nfs_pgio_header *hdr = data;
1287
abcb7bfc
TM		 1288 nfs4_ff_layout_stat_io_end_write(task,
1289 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1290 hdr->args.count, hdr->res.count,
1291 hdr->res.verf->committed);
1292
d67ae825
TH		 1293 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1294 task->tk_status == 0) {
1295 nfs4_sequence_done(task, &hdr->res.seq_res);
1296 return;
1297 }
1298
1299 /* Note this may cause RPC to be resent */
1300 hdr->mds_ops->rpc_call_done(task, hdr);
1301}
1302
1303static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1304{
1305 struct nfs_pgio_header *hdr = data;
1306
1307 rpc_count_iostats_metrics(task,
1308 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1309}
1310
abcb7bfc
TM		 1311static void ff_layout_commit_prepare_common(struct rpc_task *task,
1312 struct nfs_commit_data *cdata)
1313{
1314 nfs4_ff_layout_stat_io_start_write(
1315 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1316 0);
1317}
1318
d67ae825
TH		 1319static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1320{
abcb7bfc 1321 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1322 rpc_call_start(task);
1323}
1324
1325static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1326{
1327 struct nfs_commit_data *wdata = data;
1328
abcb7bfc 1329 if (ff_layout_setup_sequence(wdata->ds_clp,
d67ae825
TH		 1330 &wdata->args.seq_args,
1331 &wdata->res.seq_res,
abcb7bfc
TM		 1332 task))
1333 return;
1334 ff_layout_commit_prepare_common(task, data);
1335}
1336
1337static void ff_layout_commit_done(struct rpc_task *task, void *data)
1338{
1339 struct nfs_commit_data *cdata = data;
1340 struct nfs_page *req;
1341 __u64 count = 0;
1342
1343 if (task->tk_status == 0) {
1344 list_for_each_entry(req, &cdata->pages, wb_list)
1345 count += req->wb_bytes;
1346 }
1347
1348 nfs4_ff_layout_stat_io_end_write(task,
1349 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1350 count, count, NFS_FILE_SYNC);
1351
1352 pnfs_generic_write_commit_done(task, data);
d67ae825
TH		 1353}
1354
1355static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1356{
1357 struct nfs_commit_data *cdata = data;
1358
1359 rpc_count_iostats_metrics(task,
1360 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1361}
1362
1363static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1364 .rpc_call_prepare = ff_layout_read_prepare_v3,
1365 .rpc_call_done = ff_layout_read_call_done,
1366 .rpc_count_stats = ff_layout_read_count_stats,
1367 .rpc_release = pnfs_generic_rw_release,
1368};
1369
1370static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1371 .rpc_call_prepare = ff_layout_read_prepare_v4,
1372 .rpc_call_done = ff_layout_read_call_done,
1373 .rpc_count_stats = ff_layout_read_count_stats,
1374 .rpc_release = pnfs_generic_rw_release,
1375};
1376
1377static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1378 .rpc_call_prepare = ff_layout_write_prepare_v3,
1379 .rpc_call_done = ff_layout_write_call_done,
1380 .rpc_count_stats = ff_layout_write_count_stats,
1381 .rpc_release = pnfs_generic_rw_release,
1382};
1383
1384static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1385 .rpc_call_prepare = ff_layout_write_prepare_v4,
1386 .rpc_call_done = ff_layout_write_call_done,
1387 .rpc_count_stats = ff_layout_write_count_stats,
1388 .rpc_release = pnfs_generic_rw_release,
1389};
1390
1391static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1392 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1393 .rpc_call_done = ff_layout_commit_done,
d67ae825
TH		 1394 .rpc_count_stats = ff_layout_commit_count_stats,
1395 .rpc_release = pnfs_generic_commit_release,
1396};
1397
1398static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1399 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1400 .rpc_call_done = ff_layout_commit_done,
d67ae825
TH		 1401 .rpc_count_stats = ff_layout_commit_count_stats,
1402 .rpc_release = pnfs_generic_commit_release,
1403};
1404
1405static enum pnfs_try_status
1406ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1407{
1408 struct pnfs_layout_segment *lseg = hdr->lseg;
1409 struct nfs4_pnfs_ds *ds;
1410 struct rpc_clnt *ds_clnt;
1411 struct rpc_cred *ds_cred;
1412 loff_t offset = hdr->args.offset;
1413 u32 idx = hdr->pgio_mirror_idx;
1414 int vers;
1415 struct nfs_fh *fh;
1416
1417 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1418 __func__, hdr->inode->i_ino,
1419 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1420
1421 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1422 if (!ds)
1423 goto out_failed;
1424
1425 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1426 hdr->inode);
1427 if (IS_ERR(ds_clnt))
1428 goto out_failed;
1429
1430 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1431 if (IS_ERR(ds_cred))
1432 goto out_failed;
1433
1434 vers = nfs4_ff_layout_ds_version(lseg, idx);
1435
1436 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1437 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1438
1439 atomic_inc(&ds->ds_clp->cl_count);
1440 hdr->ds_clp = ds->ds_clp;
1441 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1442 if (fh)
1443 hdr->args.fh = fh;
d67ae825
TH		 1444 /*
1445 * Note that if we ever decide to split across DSes,
1446 * then we may need to handle dense-like offsets.
1447 */
1448 hdr->args.offset = offset;
1449 hdr->mds_offset = offset;
1450
1451 /* Perform an asynchronous read to ds */
1452 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1453 vers == 3 ? &ff_layout_read_call_ops_v3 :
1454 &ff_layout_read_call_ops_v4,
1455 0, RPC_TASK_SOFTCONN);
1456
1457 return PNFS_ATTEMPTED;
1458
1459out_failed:
1460 if (ff_layout_has_available_ds(lseg))
1461 return PNFS_TRY_AGAIN;
1462 return PNFS_NOT_ATTEMPTED;
1463}
1464
1465/* Perform async writes. */
1466static enum pnfs_try_status
1467ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1468{
1469 struct pnfs_layout_segment *lseg = hdr->lseg;
1470 struct nfs4_pnfs_ds *ds;
1471 struct rpc_clnt *ds_clnt;
1472 struct rpc_cred *ds_cred;
1473 loff_t offset = hdr->args.offset;
1474 int vers;
1475 struct nfs_fh *fh;
1476 int idx = hdr->pgio_mirror_idx;
1477
1478 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1479 if (!ds)
1480 return PNFS_NOT_ATTEMPTED;
1481
1482 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1483 hdr->inode);
1484 if (IS_ERR(ds_clnt))
1485 return PNFS_NOT_ATTEMPTED;
1486
1487 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1488 if (IS_ERR(ds_cred))
1489 return PNFS_NOT_ATTEMPTED;
1490
1491 vers = nfs4_ff_layout_ds_version(lseg, idx);
1492
1493 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1494 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1495 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1496 vers);
1497
1498 hdr->pgio_done_cb = ff_layout_write_done_cb;
1499 atomic_inc(&ds->ds_clp->cl_count);
1500 hdr->ds_clp = ds->ds_clp;
1501 hdr->ds_commit_idx = idx;
1502 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1503 if (fh)
1504 hdr->args.fh = fh;
1505
1506 /*
1507 * Note that if we ever decide to split across DSes,
1508 * then we may need to handle dense-like offsets.
1509 */
1510 hdr->args.offset = offset;
1511
1512 /* Perform an asynchronous write */
1513 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1514 vers == 3 ? &ff_layout_write_call_ops_v3 :
1515 &ff_layout_write_call_ops_v4,
1516 sync, RPC_TASK_SOFTCONN);
1517 return PNFS_ATTEMPTED;
1518}
1519
d67ae825
TH		 1520static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1521{
1522 return i;
1523}
1524
1525static struct nfs_fh *
1526select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1527{
1528 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1529
1530 /* FIXME: Assume that there is only one NFS version available
1531 * for the DS.
1532 */
1533 return &flseg->mirror_array[i]->fh_versions[0];
1534}
1535
1536static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1537{
1538 struct pnfs_layout_segment *lseg = data->lseg;
1539 struct nfs4_pnfs_ds *ds;
1540 struct rpc_clnt *ds_clnt;
1541 struct rpc_cred *ds_cred;
1542 u32 idx;
1543 int vers;
1544 struct nfs_fh *fh;
1545
1546 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1547 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1548 if (!ds)
1549 goto out_err;
1550
1551 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1552 data->inode);
1553 if (IS_ERR(ds_clnt))
1554 goto out_err;
1555
1556 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1557 if (IS_ERR(ds_cred))
1558 goto out_err;
1559
1560 vers = nfs4_ff_layout_ds_version(lseg, idx);
1561
1562 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1563 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1564 vers);
1565 data->commit_done_cb = ff_layout_commit_done_cb;
1566 data->cred = ds_cred;
1567 atomic_inc(&ds->ds_clp->cl_count);
1568 data->ds_clp = ds->ds_clp;
1569 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1570 if (fh)
1571 data->args.fh = fh;
abcb7bfc 1572
d67ae825
TH		 1573 return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1574 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1575 &ff_layout_commit_call_ops_v4,
1576 how, RPC_TASK_SOFTCONN);
1577out_err:
1578 pnfs_generic_prepare_to_resend_writes(data);
1579 pnfs_generic_commit_release(data);
1580 return -EAGAIN;
1581}
1582
1583static int
1584ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1585 int how, struct nfs_commit_info *cinfo)
1586{
1587 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1588 ff_layout_initiate_commit);
1589}
1590
1591static struct pnfs_ds_commit_info *
1592ff_layout_get_ds_info(struct inode *inode)
1593{
1594 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1595
1596 if (layout == NULL)
1597 return NULL;
1598
1599 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1600}
1601
1602static void
fc87701b 1603ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1604{
1605 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1606 id_node));
1607}
1608
1609static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1610 struct xdr_stream *xdr,
1611 const struct nfs4_layoutreturn_args *args)
1612{
1613 struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
1614 __be32 *start;
1615 int count = 0, ret = 0;
1616
1617 start = xdr_reserve_space(xdr, 4);
1618 if (unlikely(!start))
1619 return -E2BIG;
1620
1621 /* This assume we always return _ALL_ layouts */
1622 spin_lock(&hdr->plh_inode->i_lock);
1623 ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
1624 spin_unlock(&hdr->plh_inode->i_lock);
1625
1626 *start = cpu_to_be32(count);
1627
1628 return ret;
1629}
1630
1631/* report nothing for now */
1632static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1633 struct xdr_stream *xdr,
1634 const struct nfs4_layoutreturn_args *args)
1635{
1636 __be32 *p;
1637
1638 p = xdr_reserve_space(xdr, 4);
1639 if (likely(p))
1640 *p = cpu_to_be32(0);
1641}
1642
1643static struct nfs4_deviceid_node *
1644ff_layout_alloc_deviceid_node(struct nfs_server *server,
1645 struct pnfs_device *pdev, gfp_t gfp_flags)
1646{
1647 struct nfs4_ff_layout_ds *dsaddr;
1648
1649 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
1650 if (!dsaddr)
1651 return NULL;
1652 return &dsaddr->id_node;
1653}
1654
1655static void
1656ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
1657 struct xdr_stream *xdr,
1658 const struct nfs4_layoutreturn_args *args)
1659{
1660 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
1661 __be32 *start;
1662
1663 dprintk("%s: Begin\n", __func__);
1664 start = xdr_reserve_space(xdr, 4);
1665 BUG_ON(!start);
1666
1667 if (ff_layout_encode_ioerr(flo, xdr, args))
1668 goto out;
1669
1670 ff_layout_encode_iostats(flo, xdr, args);
1671out:
1672 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1673 dprintk("%s: Return\n", __func__);
1674}
1675
27c43064
PT		 1676static int
1677ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
1678{
1679 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
1680
1681 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
1682}
1683
1684static size_t
1685ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
1686 const int buflen)
1687{
1688 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
1689 const struct in6_addr *addr = &sin6->sin6_addr;
1690
1691 /*
1692 * RFC 4291, Section 2.2.2
1693 *
1694 * Shorthanded ANY address
1695 */
1696 if (ipv6_addr_any(addr))
1697 return snprintf(buf, buflen, "::");
1698
1699 /*
1700 * RFC 4291, Section 2.2.2
1701 *
1702 * Shorthanded loopback address
1703 */
1704 if (ipv6_addr_loopback(addr))
1705 return snprintf(buf, buflen, "::1");
1706
1707 /*
1708 * RFC 4291, Section 2.2.3
1709 *
1710 * Special presentation address format for mapped v4
1711 * addresses.
1712 */
1713 if (ipv6_addr_v4mapped(addr))
1714 return snprintf(buf, buflen, "::ffff:%pI4",
1715 &addr->s6_addr32[3]);
1716
1717 /*
1718 * RFC 4291, Section 2.2.1
1719 */
1720 return snprintf(buf, buflen, "%pI6c", addr);
1721}
1722
1723/* Derived from rpc_sockaddr2uaddr */
1724static void
1725ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
1726{
1727 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
1728 char portbuf[RPCBIND_MAXUADDRPLEN];
1729 char addrbuf[RPCBIND_MAXUADDRLEN];
1730 char *netid;
1731 unsigned short port;
1732 int len, netid_len;
1733 __be32 *p;
1734
1735 switch (sap->sa_family) {
1736 case AF_INET:
1737 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
1738 return;
1739 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1740 netid = "tcp";
1741 netid_len = 3;
1742 break;
1743 case AF_INET6:
1744 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
1745 return;
1746 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
1747 netid = "tcp6";
1748 netid_len = 4;
1749 break;
1750 default:
1751 /* we only support tcp and tcp6 */
1752 WARN_ON_ONCE(1);
1753 return;
1754 }
1755
1756 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
1757 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
1758
1759 p = xdr_reserve_space(xdr, 4 + netid_len);
1760 xdr_encode_opaque(p, netid, netid_len);
1761
1762 p = xdr_reserve_space(xdr, 4 + len);
1763 xdr_encode_opaque(p, addrbuf, len);
1764}
1765
1766static void
1767ff_layout_encode_nfstime(struct xdr_stream *xdr,
1768 ktime_t t)
1769{
1770 struct timespec64 ts;
1771 __be32 *p;
1772
1773 p = xdr_reserve_space(xdr, 12);
1774 ts = ktime_to_timespec64(t);
1775 p = xdr_encode_hyper(p, ts.tv_sec);
1776 *p++ = cpu_to_be32(ts.tv_nsec);
1777}
1778
1779static void
1780ff_layout_encode_io_latency(struct xdr_stream *xdr,
1781 struct nfs4_ff_io_stat *stat)
1782{
1783 __be32 *p;
1784
1785 p = xdr_reserve_space(xdr, 5 * 8);
1786 p = xdr_encode_hyper(p, stat->ops_requested);
1787 p = xdr_encode_hyper(p, stat->bytes_requested);
1788 p = xdr_encode_hyper(p, stat->ops_completed);
1789 p = xdr_encode_hyper(p, stat->bytes_completed);
1790 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
1791 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
1792 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
1793}
1794
1795static void
1796ff_layout_encode_layoutstats(struct xdr_stream *xdr,
1797 struct nfs42_layoutstat_args *args,
1798 struct nfs42_layoutstat_devinfo *devinfo)
1799{
1800 struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private;
1801 struct nfs4_pnfs_ds_addr *da;
1802 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
1803 struct nfs_fh *fh = &mirror->fh_versions[0];
1804 __be32 *p, *start;
1805
1806 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
1807 dprintk("%s: DS %s: encoding address %s\n",
1808 __func__, ds->ds_remotestr, da->da_remotestr);
1809 /* layoutupdate length */
1810 start = xdr_reserve_space(xdr, 4);
1811 /* netaddr4 */
1812 ff_layout_encode_netaddr(xdr, da);
1813 /* nfs_fh4 */
1814 p = xdr_reserve_space(xdr, 4 + fh->size);
1815 xdr_encode_opaque(p, fh->data, fh->size);
1816 /* ff_io_latency4 read */
1817 spin_lock(&mirror->lock);
1818 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
1819 /* ff_io_latency4 write */
1820 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
1821 spin_unlock(&mirror->lock);
1822 /* nfstime4 */
1823 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
1824 /* bool */
1825 p = xdr_reserve_space(xdr, 4);
1826 *p = cpu_to_be32(false);
1827
1828 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1829}
1830
ad4dc53e
PT		 1831static bool
1832ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
1833 struct pnfs_layout_segment *pls,
1834 int *dev_count, int dev_limit)
1835{
1836 struct nfs4_ff_layout_mirror *mirror;
1837 struct nfs4_deviceid_node *dev;
1838 struct nfs42_layoutstat_devinfo *devinfo;
1839 int i;
1840
1841 for (i = 0; i <= FF_LAYOUT_MIRROR_COUNT(pls); i++) {
1842 if (*dev_count >= dev_limit)
1843 break;
1844 mirror = FF_LAYOUT_COMP(pls, i);
27c43064
PT		 1845 if (!mirror || !mirror->mirror_ds)
1846 continue;
ad4dc53e
PT		 1847 dev = FF_LAYOUT_DEVID_NODE(pls, i);
1848 devinfo = &args->devinfo[*dev_count];
1849 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
1850 devinfo->offset = pls->pls_range.offset;
1851 devinfo->length = pls->pls_range.length;
1852 /* well, we don't really know if IO is continuous or not! */
1853 devinfo->read_count = mirror->read_stat.io_stat.bytes_completed;
1854 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
1855 devinfo->write_count = mirror->write_stat.io_stat.bytes_completed;
1856 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
1857 devinfo->layout_type = LAYOUT_FLEX_FILES;
27c43064
PT		 1858 devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
1859 devinfo->layout_private = mirror;
1860 /* lseg refcount put in cleanup_layoutstats */
1861 pnfs_get_lseg(pls);
ad4dc53e
PT		 1862
1863 ++(*dev_count);
1864 }
1865
1866 return *dev_count < dev_limit;
1867}
1868
1869static int
1870ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
1871{
1872 struct pnfs_layout_segment *pls;
1873 int dev_count = 0;
1874
1875 spin_lock(&args->inode->i_lock);
1876 list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
1877 dev_count += FF_LAYOUT_MIRROR_COUNT(pls);
1878 }
1879 spin_unlock(&args->inode->i_lock);
1880 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
1881 if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
1882 dprintk("%s: truncating devinfo to limit (%d:%d)\n",
1883 __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
1884 dev_count = PNFS_LAYOUTSTATS_MAXDEV;
1885 }
1886 args->devinfo = kmalloc(dev_count * sizeof(*args->devinfo), GFP_KERNEL);
1887 if (!args->devinfo)
1888 return -ENOMEM;
1889
1890 dev_count = 0;
1891 spin_lock(&args->inode->i_lock);
1892 list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
1893 if (!ff_layout_mirror_prepare_stats(args, pls, &dev_count,
1894 PNFS_LAYOUTSTATS_MAXDEV)) {
1895 break;
1896 }
1897 }
1898 spin_unlock(&args->inode->i_lock);
1899 args->num_dev = dev_count;
1900
1901 return 0;
1902}
1903
27c43064
PT		 1904static void
1905ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data)
1906{
1907 struct nfs4_ff_layout_mirror *mirror;
1908 int i;
1909
1910 for (i = 0; i < data->args.num_dev; i++) {
1911 mirror = data->args.devinfo[i].layout_private;
1912 data->args.devinfo[i].layout_private = NULL;
1913 pnfs_put_lseg(mirror->lseg);
1914 }
1915}
1916
d67ae825
TH		 1917static struct pnfs_layoutdriver_type flexfilelayout_type = {
1918 .id = LAYOUT_FLEX_FILES,
1919 .name = "LAYOUT_FLEX_FILES",
1920 .owner = THIS_MODULE,
1921 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
1922 .free_layout_hdr = ff_layout_free_layout_hdr,
1923 .alloc_lseg = ff_layout_alloc_lseg,
1924 .free_lseg = ff_layout_free_lseg,
1925 .pg_read_ops = &ff_layout_pg_read_ops,
1926 .pg_write_ops = &ff_layout_pg_write_ops,
1927 .get_ds_info = ff_layout_get_ds_info,
fc87701b 1928 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 1929 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 1930 .clear_request_commit = pnfs_generic_clear_request_commit,
1931 .scan_commit_lists = pnfs_generic_scan_commit_lists,
1932 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
1933 .commit_pagelist = ff_layout_commit_pagelist,
1934 .read_pagelist = ff_layout_read_pagelist,
1935 .write_pagelist = ff_layout_write_pagelist,
1936 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
1937 .encode_layoutreturn = ff_layout_encode_layoutreturn,
5bb89b47 1938 .sync = pnfs_nfs_generic_sync,
ad4dc53e 1939 .prepare_layoutstats = ff_layout_prepare_layoutstats,
27c43064 1940 .cleanup_layoutstats = ff_layout_cleanup_layoutstats,
d67ae825
TH		 1941};
1942
1943static int __init nfs4flexfilelayout_init(void)
1944{
1945 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
1946 __func__);
1947 return pnfs_register_layoutdriver(&flexfilelayout_type);
1948}
1949
1950static void __exit nfs4flexfilelayout_exit(void)
1951{
1952 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
1953 __func__);
1954 pnfs_unregister_layoutdriver(&flexfilelayout_type);
1955}
1956
1957MODULE_ALIAS("nfs-layouttype4-4");
1958
1959MODULE_LICENSE("GPL");
1960MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
1961
1962module_init(nfs4flexfilelayout_init);
1963module_exit(nfs4flexfilelayout_exit);
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