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[people/ms/linux.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
c0f5f505
TM		 346 p = xdr_inline_decode(&stream, 4);
347 if (p)
348 fls->flags = be32_to_cpup(p);
349
d67ae825
TH		 350 ff_layout_sort_mirrors(fls);
351 rc = ff_layout_check_layout(lgr);
352 if (rc)
353 goto out_err_free;
354
355 ret = &fls->generic_hdr;
356 dprintk("<-- %s (success)\n", __func__);
357out_free_page:
358 __free_page(scratch);
359 return ret;
360out_err_free:
361 _ff_layout_free_lseg(fls);
362 ret = ERR_PTR(rc);
363 dprintk("<-- %s (%d)\n", __func__, rc);
364 goto out_free_page;
365}
366
367static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
368{
369 struct pnfs_layout_segment *lseg;
370
371 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
372 if (lseg->pls_range.iomode == IOMODE_RW)
373 return true;
374
375 return false;
376}
377
378static void
379ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
380{
381 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
382 int i;
383
384 dprintk("--> %s\n", __func__);
385
386 for (i = 0; i < fls->mirror_array_cnt; i++) {
387 if (fls->mirror_array[i]) {
388 nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
389 fls->mirror_array[i]->mirror_ds = NULL;
390 if (fls->mirror_array[i]->cred) {
391 put_rpccred(fls->mirror_array[i]->cred);
392 fls->mirror_array[i]->cred = NULL;
393 }
394 }
395 }
396
397 if (lseg->pls_range.iomode == IOMODE_RW) {
398 struct nfs4_flexfile_layout *ffl;
399 struct inode *inode;
400
401 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
402 inode = ffl->generic_hdr.plh_inode;
403 spin_lock(&inode->i_lock);
404 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
405 ffl->commit_info.nbuckets = 0;
406 kfree(ffl->commit_info.buckets);
407 ffl->commit_info.buckets = NULL;
408 }
409 spin_unlock(&inode->i_lock);
410 }
411 _ff_layout_free_lseg(fls);
412}
413
414/* Return 1 until we have multiple lsegs support */
415static int
416ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
417{
418 return 1;
419}
420
abcb7bfc 421static void
e76d28dd 422nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 423{
9bbd9bb4
PT		 424 /* first IO request? */
425 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 426 timer->start_time = now;
abcb7bfc
TM		 427 }
428}
429
430static ktime_t
e76d28dd 431nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 432{
e76d28dd 433 ktime_t start;
abcb7bfc 434
9bbd9bb4
PT		 435 if (atomic_dec_return(&timer->n_ops) < 0)
436 WARN_ON_ONCE(1);
437
9bbd9bb4
PT		 438 start = timer->start_time;
439 timer->start_time = now;
abcb7bfc
TM		 440 return ktime_sub(now, start);
441}
442
97ba375b 443static bool
d983803d 444nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 445 struct nfs4_ff_layoutstat *layoutstat,
446 ktime_t now)
abcb7bfc 447{
d983803d
PT		 448 static const ktime_t notime = {0};
449
e76d28dd 450 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
9bbd9bb4
PT		 451 if (ktime_equal(mirror->start_time, notime))
452 mirror->start_time = now;
453 if (ktime_equal(mirror->last_report_time, notime))
454 mirror->last_report_time = now;
97ba375b
PT		 455 if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >=
456 FF_LAYOUTSTATS_REPORT_INTERVAL) {
457 mirror->last_report_time = now;
458 return true;
459 }
460
461 return false;
abcb7bfc
TM		 462}
463
464static void
465nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
466 __u64 requested)
467{
468 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
469
470 iostat->ops_requested++;
471 iostat->bytes_requested += requested;
472}
473
474static void
475nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
476 __u64 requested,
477 __u64 completed,
e76d28dd
TM		 478 ktime_t time_completed,
479 ktime_t time_started)
abcb7bfc
TM		 480{
481 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 482 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 483 ktime_t timer;
484
485 iostat->ops_completed++;
486 iostat->bytes_completed += completed;
487 iostat->bytes_not_delivered += requested - completed;
488
e76d28dd 489 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 490 iostat->total_busy_time =
491 ktime_add(iostat->total_busy_time, timer);
492 iostat->aggregate_completion_time =
e76d28dd
TM		 493 ktime_add(iostat->aggregate_completion_time,
494 completion_time);
abcb7bfc
TM		 495}
496
497static void
498nfs4_ff_layout_stat_io_start_read(struct nfs4_ff_layout_mirror *mirror,
e76d28dd 499 __u64 requested, ktime_t now)
abcb7bfc 500{
97ba375b
PT		 501 bool report;
502
abcb7bfc 503 spin_lock(&mirror->lock);
e76d28dd 504 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
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)
c8ad8894
TM		 509 pnfs_report_layoutstat(mirror->lseg->pls_layout->plh_inode,
510 GFP_KERNEL);
abcb7bfc
TM		 511}
512
513static void
514nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
515 struct nfs4_ff_layout_mirror *mirror,
516 __u64 requested,
517 __u64 completed)
518{
519 spin_lock(&mirror->lock);
520 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
521 requested, completed,
e76d28dd 522 ktime_get(), task->tk_start);
abcb7bfc
TM		 523 spin_unlock(&mirror->lock);
524}
525
526static void
527nfs4_ff_layout_stat_io_start_write(struct nfs4_ff_layout_mirror *mirror,
e76d28dd 528 __u64 requested, ktime_t now)
abcb7bfc 529{
97ba375b
PT		 530 bool report;
531
abcb7bfc 532 spin_lock(&mirror->lock);
e76d28dd 533 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc
TM		 534 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
535 spin_unlock(&mirror->lock);
97ba375b
PT		 536
537 if (report)
c8ad8894
TM		 538 pnfs_report_layoutstat(mirror->lseg->pls_layout->plh_inode,
539 GFP_NOIO);
abcb7bfc
TM		 540}
541
542static void
543nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
544 struct nfs4_ff_layout_mirror *mirror,
545 __u64 requested,
546 __u64 completed,
547 enum nfs3_stable_how committed)
548{
549 if (committed == NFS_UNSTABLE)
550 requested = completed = 0;
551
552 spin_lock(&mirror->lock);
553 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 554 requested, completed, ktime_get(), task->tk_start);
abcb7bfc
TM		 555 spin_unlock(&mirror->lock);
556}
557
d67ae825
TH		 558static int
559ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
560 struct nfs_commit_info *cinfo,
561 gfp_t gfp_flags)
562{
563 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
564 struct pnfs_commit_bucket *buckets;
565 int size;
566
567 if (cinfo->ds->nbuckets != 0) {
568 /* This assumes there is only one RW lseg per file.
569 * To support multiple lseg per file, we need to
570 * change struct pnfs_commit_bucket to allow dynamic
571 * increasing nbuckets.
572 */
573 return 0;
574 }
575
576 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
577
578 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
579 gfp_flags);
580 if (!buckets)
581 return -ENOMEM;
582 else {
583 int i;
584
585 spin_lock(cinfo->lock);
586 if (cinfo->ds->nbuckets != 0)
587 kfree(buckets);
588 else {
589 cinfo->ds->buckets = buckets;
590 cinfo->ds->nbuckets = size;
591 for (i = 0; i < size; i++) {
592 INIT_LIST_HEAD(&buckets[i].written);
593 INIT_LIST_HEAD(&buckets[i].committing);
594 /* mark direct verifier as unset */
595 buckets[i].direct_verf.committed =
596 NFS_INVALID_STABLE_HOW;
597 }
598 }
599 spin_unlock(cinfo->lock);
600 return 0;
601 }
602}
603
604static struct nfs4_pnfs_ds *
605ff_layout_choose_best_ds_for_read(struct nfs_pageio_descriptor *pgio,
606 int *best_idx)
607{
608 struct nfs4_ff_layout_segment *fls;
609 struct nfs4_pnfs_ds *ds;
610 int idx;
611
612 fls = FF_LAYOUT_LSEG(pgio->pg_lseg);
613 /* mirrors are sorted by efficiency */
614 for (idx = 0; idx < fls->mirror_array_cnt; idx++) {
615 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, idx, false);
616 if (ds) {
617 *best_idx = idx;
618 return ds;
619 }
620 }
621
622 return NULL;
623}
624
625static void
626ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
627 struct nfs_page *req)
628{
629 struct nfs_pgio_mirror *pgm;
630 struct nfs4_ff_layout_mirror *mirror;
631 struct nfs4_pnfs_ds *ds;
632 int ds_idx;
633
634 /* Use full layout for now */
635 if (!pgio->pg_lseg)
636 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
637 req->wb_context,
638 0,
639 NFS4_MAX_UINT64,
640 IOMODE_READ,
641 GFP_KERNEL);
642 /* If no lseg, fall back to read through mds */
643 if (pgio->pg_lseg == NULL)
644 goto out_mds;
645
646 ds = ff_layout_choose_best_ds_for_read(pgio, &ds_idx);
647 if (!ds)
648 goto out_mds;
649 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
650
651 pgio->pg_mirror_idx = ds_idx;
652
653 /* read always uses only one mirror - idx 0 for pgio layer */
654 pgm = &pgio->pg_mirrors[0];
655 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
656
657 return;
658out_mds:
659 pnfs_put_lseg(pgio->pg_lseg);
660 pgio->pg_lseg = NULL;
661 nfs_pageio_reset_read_mds(pgio);
662}
663
664static void
665ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
666 struct nfs_page *req)
667{
668 struct nfs4_ff_layout_mirror *mirror;
669 struct nfs_pgio_mirror *pgm;
670 struct nfs_commit_info cinfo;
671 struct nfs4_pnfs_ds *ds;
672 int i;
673 int status;
674
675 if (!pgio->pg_lseg)
676 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
677 req->wb_context,
678 0,
679 NFS4_MAX_UINT64,
680 IOMODE_RW,
681 GFP_NOFS);
682 /* If no lseg, fall back to write through mds */
683 if (pgio->pg_lseg == NULL)
684 goto out_mds;
685
686 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
687 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
688 if (status < 0)
689 goto out_mds;
690
691 /* Use a direct mapping of ds_idx to pgio mirror_idx */
692 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
693 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
694 goto out_mds;
695
696 for (i = 0; i < pgio->pg_mirror_count; i++) {
697 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
698 if (!ds)
699 goto out_mds;
700 pgm = &pgio->pg_mirrors[i];
701 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
702 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
703 }
704
705 return;
706
707out_mds:
708 pnfs_put_lseg(pgio->pg_lseg);
709 pgio->pg_lseg = NULL;
710 nfs_pageio_reset_write_mds(pgio);
711}
712
713static unsigned int
714ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
715 struct nfs_page *req)
716{
717 if (!pgio->pg_lseg)
718 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
719 req->wb_context,
720 0,
721 NFS4_MAX_UINT64,
722 IOMODE_RW,
723 GFP_NOFS);
724 if (pgio->pg_lseg)
725 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
726
727 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825
TH		 728 nfs_pageio_reset_write_mds(pgio);
729 return 1;
730}
731
732static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
733 .pg_init = ff_layout_pg_init_read,
734 .pg_test = pnfs_generic_pg_test,
735 .pg_doio = pnfs_generic_pg_readpages,
736 .pg_cleanup = pnfs_generic_pg_cleanup,
737};
738
739static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
740 .pg_init = ff_layout_pg_init_write,
741 .pg_test = pnfs_generic_pg_test,
742 .pg_doio = pnfs_generic_pg_writepages,
743 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
744 .pg_cleanup = pnfs_generic_pg_cleanup,
745};
746
747static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
748{
749 struct rpc_task *task = &hdr->task;
750
751 pnfs_layoutcommit_inode(hdr->inode, false);
752
753 if (retry_pnfs) {
754 dprintk("%s Reset task %5u for i/o through pNFS "
755 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
756 hdr->task.tk_pid,
757 hdr->inode->i_sb->s_id,
758 (unsigned long long)NFS_FILEID(hdr->inode),
759 hdr->args.count,
760 (unsigned long long)hdr->args.offset);
761
762 if (!hdr->dreq) {
763 struct nfs_open_context *ctx;
764
765 ctx = nfs_list_entry(hdr->pages.next)->wb_context;
766 set_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
767 hdr->completion_ops->error_cleanup(&hdr->pages);
768 } else {
769 nfs_direct_set_resched_writes(hdr->dreq);
770 /* fake unstable write to let common nfs resend pages */
771 hdr->verf.committed = NFS_UNSTABLE;
d6208769 772 hdr->good_bytes = hdr->args.count;
d67ae825
TH		 773 }
774 return;
775 }
776
777 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
778 dprintk("%s Reset task %5u for i/o through MDS "
779 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
780 hdr->task.tk_pid,
781 hdr->inode->i_sb->s_id,
782 (unsigned long long)NFS_FILEID(hdr->inode),
783 hdr->args.count,
784 (unsigned long long)hdr->args.offset);
785
786 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
787 }
788}
789
790static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
791{
792 struct rpc_task *task = &hdr->task;
793
794 pnfs_layoutcommit_inode(hdr->inode, false);
795
796 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
797 dprintk("%s Reset task %5u for i/o through MDS "
798 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
799 hdr->task.tk_pid,
800 hdr->inode->i_sb->s_id,
801 (unsigned long long)NFS_FILEID(hdr->inode),
802 hdr->args.count,
803 (unsigned long long)hdr->args.offset);
804
805 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
806 }
807}
808
809static int ff_layout_async_handle_error_v4(struct rpc_task *task,
810 struct nfs4_state *state,
811 struct nfs_client *clp,
812 struct pnfs_layout_segment *lseg,
813 int idx)
814{
815 struct pnfs_layout_hdr *lo = lseg->pls_layout;
816 struct inode *inode = lo->plh_inode;
817 struct nfs_server *mds_server = NFS_SERVER(inode);
818
819 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
820 struct nfs_client *mds_client = mds_server->nfs_client;
821 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
822
823 if (task->tk_status >= 0)
824 return 0;
825
826 switch (task->tk_status) {
827 /* MDS state errors */
828 case -NFS4ERR_DELEG_REVOKED:
829 case -NFS4ERR_ADMIN_REVOKED:
830 case -NFS4ERR_BAD_STATEID:
831 if (state == NULL)
832 break;
833 nfs_remove_bad_delegation(state->inode);
834 case -NFS4ERR_OPENMODE:
835 if (state == NULL)
836 break;
837 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
838 goto out_bad_stateid;
839 goto wait_on_recovery;
840 case -NFS4ERR_EXPIRED:
841 if (state != NULL) {
842 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
843 goto out_bad_stateid;
844 }
845 nfs4_schedule_lease_recovery(mds_client);
846 goto wait_on_recovery;
847 /* DS session errors */
848 case -NFS4ERR_BADSESSION:
849 case -NFS4ERR_BADSLOT:
850 case -NFS4ERR_BAD_HIGH_SLOT:
851 case -NFS4ERR_DEADSESSION:
852 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
853 case -NFS4ERR_SEQ_FALSE_RETRY:
854 case -NFS4ERR_SEQ_MISORDERED:
855 dprintk("%s ERROR %d, Reset session. Exchangeid "
856 "flags 0x%x\n", __func__, task->tk_status,
857 clp->cl_exchange_flags);
858 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
859 break;
860 case -NFS4ERR_DELAY:
861 case -NFS4ERR_GRACE:
862 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
863 break;
864 case -NFS4ERR_RETRY_UNCACHED_REP:
865 break;
866 /* Invalidate Layout errors */
867 case -NFS4ERR_PNFS_NO_LAYOUT:
868 case -ESTALE: /* mapped NFS4ERR_STALE */
869 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
870 case -EISDIR: /* mapped NFS4ERR_ISDIR */
871 case -NFS4ERR_FHEXPIRED:
872 case -NFS4ERR_WRONG_TYPE:
873 dprintk("%s Invalid layout error %d\n", __func__,
874 task->tk_status);
875 /*
876 * Destroy layout so new i/o will get a new layout.
877 * Layout will not be destroyed until all current lseg
878 * references are put. Mark layout as invalid to resend failed
879 * i/o and all i/o waiting on the slot table to the MDS until
880 * layout is destroyed and a new valid layout is obtained.
881 */
882 pnfs_destroy_layout(NFS_I(inode));
883 rpc_wake_up(&tbl->slot_tbl_waitq);
884 goto reset;
885 /* RPC connection errors */
886 case -ECONNREFUSED:
887 case -EHOSTDOWN:
888 case -EHOSTUNREACH:
889 case -ENETUNREACH:
890 case -EIO:
891 case -ETIMEDOUT:
892 case -EPIPE:
893 dprintk("%s DS connection error %d\n", __func__,
894 task->tk_status);
895 nfs4_mark_deviceid_unavailable(devid);
896 rpc_wake_up(&tbl->slot_tbl_waitq);
897 /* fall through */
898 default:
899 if (ff_layout_has_available_ds(lseg))
900 return -NFS4ERR_RESET_TO_PNFS;
901reset:
902 dprintk("%s Retry through MDS. Error %d\n", __func__,
903 task->tk_status);
904 return -NFS4ERR_RESET_TO_MDS;
905 }
906out:
907 task->tk_status = 0;
908 return -EAGAIN;
909out_bad_stateid:
910 task->tk_status = -EIO;
911 return 0;
912wait_on_recovery:
913 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
914 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
915 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
916 goto out;
917}
918
919/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
920static int ff_layout_async_handle_error_v3(struct rpc_task *task,
921 struct pnfs_layout_segment *lseg,
922 int idx)
923{
924 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
925
926 if (task->tk_status >= 0)
927 return 0;
928
929 if (task->tk_status != -EJUKEBOX) {
930 dprintk("%s DS connection error %d\n", __func__,
931 task->tk_status);
932 nfs4_mark_deviceid_unavailable(devid);
933 if (ff_layout_has_available_ds(lseg))
934 return -NFS4ERR_RESET_TO_PNFS;
935 else
936 return -NFS4ERR_RESET_TO_MDS;
937 }
938
939 if (task->tk_status == -EJUKEBOX)
940 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
941 task->tk_status = 0;
942 rpc_restart_call(task);
943 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
944 return -EAGAIN;
945}
946
947static int ff_layout_async_handle_error(struct rpc_task *task,
948 struct nfs4_state *state,
949 struct nfs_client *clp,
950 struct pnfs_layout_segment *lseg,
951 int idx)
952{
953 int vers = clp->cl_nfs_mod->rpc_vers->number;
954
955 switch (vers) {
956 case 3:
957 return ff_layout_async_handle_error_v3(task, lseg, idx);
958 case 4:
959 return ff_layout_async_handle_error_v4(task, state, clp,
960 lseg, idx);
961 default:
962 /* should never happen */
963 WARN_ON_ONCE(1);
964 return 0;
965 }
966}
967
968static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
969 int idx, u64 offset, u64 length,
dd52128a 970 u32 status, int opnum, int error)
d67ae825
TH		 971{
972 struct nfs4_ff_layout_mirror *mirror;
973 int err;
974
dd52128a
TM		 975 if (status == 0) {
976 switch (error) {
977 case -ETIMEDOUT:
978 case -EPFNOSUPPORT:
979 case -EPROTONOSUPPORT:
980 case -EOPNOTSUPP:
981 case -ECONNREFUSED:
982 case -ECONNRESET:
983 case -EHOSTDOWN:
984 case -EHOSTUNREACH:
985 case -ENETUNREACH:
986 case -EADDRINUSE:
987 case -ENOBUFS:
988 case -EPIPE:
989 case -EPERM:
990 status = NFS4ERR_NXIO;
991 break;
992 case -EACCES:
993 status = NFS4ERR_ACCESS;
994 break;
995 default:
996 return;
997 }
998 }
999
d67ae825
TH		 1000 mirror = FF_LAYOUT_COMP(lseg, idx);
1001 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1002 mirror, offset, length, status, opnum,
1003 GFP_NOIO);
1004 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1005}
1006
1007/* NFS_PROTO call done callback routines */
1008
1009static int ff_layout_read_done_cb(struct rpc_task *task,
1010 struct nfs_pgio_header *hdr)
1011{
1012 struct inode *inode;
1013 int err;
1014
1015 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1016 if (task->tk_status < 0)
d67ae825
TH		 1017 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1018 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1019 hdr->res.op_status, OP_READ,
1020 task->tk_status);
d67ae825
TH		 1021 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1022 hdr->ds_clp, hdr->lseg,
1023 hdr->pgio_mirror_idx);
1024
1025 switch (err) {
1026 case -NFS4ERR_RESET_TO_PNFS:
1027 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1028 &hdr->lseg->pls_layout->plh_flags);
1029 pnfs_read_resend_pnfs(hdr);
1030 return task->tk_status;
1031 case -NFS4ERR_RESET_TO_MDS:
1032 inode = hdr->lseg->pls_layout->plh_inode;
1033 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1034 ff_layout_reset_read(hdr);
1035 return task->tk_status;
1036 case -EAGAIN:
1037 rpc_restart_call_prepare(task);
1038 return -EAGAIN;
1039 }
1040
1041 return 0;
1042}
1043
c0f5f505
TM		 1044static bool
1045ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1046{
1047 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1048}
1049
d67ae825
TH		 1050/*
1051 * We reference the rpc_cred of the first WRITE that triggers the need for
1052 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1053 * rfc5661 is not clear about which credential should be used.
1054 *
1055 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1056 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1057 * we always send layoutcommit after DS writes.
1058 */
1059static void
1060ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
1061{
c0f5f505
TM		 1062 if (!ff_layout_need_layoutcommit(hdr->lseg))
1063 return;
1064
67af7611
TM		 1065 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1066 hdr->mds_offset + hdr->res.count);
d67ae825
TH		 1067 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
1068 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
1069}
1070
1071static bool
1072ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx)
1073{
1074 /* No mirroring for now */
1075 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1076
1077 return ff_layout_test_devid_unavailable(node);
1078}
1079
1080static int ff_layout_read_prepare_common(struct rpc_task *task,
1081 struct nfs_pgio_header *hdr)
1082{
abcb7bfc
TM		 1083 nfs4_ff_layout_stat_io_start_read(
1084 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1085 hdr->args.count,
1086 task->tk_start);
abcb7bfc 1087
d67ae825
TH		 1088 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1089 rpc_exit(task, -EIO);
1090 return -EIO;
1091 }
1092 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1093 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
1094 if (ff_layout_has_available_ds(hdr->lseg))
1095 pnfs_read_resend_pnfs(hdr);
1096 else
1097 ff_layout_reset_read(hdr);
1098 rpc_exit(task, 0);
1099 return -EAGAIN;
1100 }
1101 hdr->pgio_done_cb = ff_layout_read_done_cb;
1102
1103 return 0;
1104}
1105
1106/*
1107 * Call ops for the async read/write cases
1108 * In the case of dense layouts, the offset needs to be reset to its
1109 * original value.
1110 */
1111static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1112{
1113 struct nfs_pgio_header *hdr = data;
1114
1115 if (ff_layout_read_prepare_common(task, hdr))
1116 return;
1117
1118 rpc_call_start(task);
1119}
1120
1121static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1122 struct nfs4_sequence_args *args,
1123 struct nfs4_sequence_res *res,
1124 struct rpc_task *task)
1125{
1126 if (ds_clp->cl_session)
1127 return nfs41_setup_sequence(ds_clp->cl_session,
1128 args,
1129 res,
1130 task);
1131 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1132 args,
1133 res,
1134 task);
1135}
1136
1137static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1138{
1139 struct nfs_pgio_header *hdr = data;
1140
d67ae825
TH		 1141 if (ff_layout_setup_sequence(hdr->ds_clp,
1142 &hdr->args.seq_args,
1143 &hdr->res.seq_res,
1144 task))
1145 return;
1146
abcb7bfc
TM		 1147 if (ff_layout_read_prepare_common(task, hdr))
1148 return;
1149
d67ae825
TH		 1150 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1151 hdr->args.lock_context, FMODE_READ) == -EIO)
1152 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1153}
1154
1155static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1156{
1157 struct nfs_pgio_header *hdr = data;
1158
1159 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1160
abcb7bfc
TM		 1161 nfs4_ff_layout_stat_io_end_read(task,
1162 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1163 hdr->args.count, hdr->res.count);
1164
d67ae825
TH		 1165 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1166 task->tk_status == 0) {
1167 nfs4_sequence_done(task, &hdr->res.seq_res);
1168 return;
1169 }
1170
1171 /* Note this may cause RPC to be resent */
1172 hdr->mds_ops->rpc_call_done(task, hdr);
1173}
1174
1175static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1176{
1177 struct nfs_pgio_header *hdr = data;
1178
1179 rpc_count_iostats_metrics(task,
1180 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1181}
1182
1183static int ff_layout_write_done_cb(struct rpc_task *task,
1184 struct nfs_pgio_header *hdr)
1185{
1186 struct inode *inode;
1187 int err;
1188
1189 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1190 if (task->tk_status < 0)
d67ae825
TH		 1191 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1192 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1193 hdr->res.op_status, OP_WRITE,
1194 task->tk_status);
d67ae825
TH		 1195 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1196 hdr->ds_clp, hdr->lseg,
1197 hdr->pgio_mirror_idx);
1198
1199 switch (err) {
1200 case -NFS4ERR_RESET_TO_PNFS:
1201 case -NFS4ERR_RESET_TO_MDS:
1202 inode = hdr->lseg->pls_layout->plh_inode;
1203 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1204 if (err == -NFS4ERR_RESET_TO_PNFS) {
1205 pnfs_set_retry_layoutget(hdr->lseg->pls_layout);
1206 ff_layout_reset_write(hdr, true);
1207 } else {
1208 pnfs_clear_retry_layoutget(hdr->lseg->pls_layout);
1209 ff_layout_reset_write(hdr, false);
1210 }
1211 return task->tk_status;
1212 case -EAGAIN:
1213 rpc_restart_call_prepare(task);
1214 return -EAGAIN;
1215 }
1216
1217 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1218 hdr->res.verf->committed == NFS_DATA_SYNC)
1219 ff_layout_set_layoutcommit(hdr);
1220
54204010
PT		 1221 /* zero out fattr since we don't care DS attr at all */
1222 hdr->fattr.valid = 0;
69f230d9
PT		 1223 if (task->tk_status >= 0)
1224 nfs_writeback_update_inode(hdr);
1225
d67ae825
TH		 1226 return 0;
1227}
1228
1229static int ff_layout_commit_done_cb(struct rpc_task *task,
1230 struct nfs_commit_data *data)
1231{
1232 struct inode *inode;
1233 int err;
1234
1235 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
dd52128a 1236 if (task->tk_status < 0)
d67ae825
TH		 1237 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1238 data->args.offset, data->args.count,
dd52128a
TM		 1239 data->res.op_status, OP_COMMIT,
1240 task->tk_status);
d67ae825
TH		 1241 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1242 data->lseg, data->ds_commit_index);
1243
1244 switch (err) {
1245 case -NFS4ERR_RESET_TO_PNFS:
1246 case -NFS4ERR_RESET_TO_MDS:
1247 inode = data->lseg->pls_layout->plh_inode;
1248 pnfs_error_mark_layout_for_return(inode, data->lseg);
1249 if (err == -NFS4ERR_RESET_TO_PNFS)
1250 pnfs_set_retry_layoutget(data->lseg->pls_layout);
1251 else
1252 pnfs_clear_retry_layoutget(data->lseg->pls_layout);
1253 pnfs_generic_prepare_to_resend_writes(data);
1254 return -EAGAIN;
1255 case -EAGAIN:
1256 rpc_restart_call_prepare(task);
1257 return -EAGAIN;
1258 }
1259
c0f5f505
TM		 1260 if (data->verf.committed == NFS_UNSTABLE
1261 && ff_layout_need_layoutcommit(data->lseg))
67af7611 1262 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1263
1264 return 0;
1265}
1266
1267static int ff_layout_write_prepare_common(struct rpc_task *task,
1268 struct nfs_pgio_header *hdr)
1269{
abcb7bfc
TM		 1270 nfs4_ff_layout_stat_io_start_write(
1271 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1272 hdr->args.count,
1273 task->tk_start);
abcb7bfc 1274
d67ae825
TH		 1275 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1276 rpc_exit(task, -EIO);
1277 return -EIO;
1278 }
1279
1280 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1281 bool retry_pnfs;
1282
1283 retry_pnfs = ff_layout_has_available_ds(hdr->lseg);
1284 dprintk("%s task %u reset io to %s\n", __func__,
1285 task->tk_pid, retry_pnfs ? "pNFS" : "MDS");
1286 ff_layout_reset_write(hdr, retry_pnfs);
1287 rpc_exit(task, 0);
1288 return -EAGAIN;
1289 }
1290
1291 return 0;
1292}
1293
1294static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1295{
1296 struct nfs_pgio_header *hdr = data;
1297
1298 if (ff_layout_write_prepare_common(task, hdr))
1299 return;
1300
1301 rpc_call_start(task);
1302}
1303
1304static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1305{
1306 struct nfs_pgio_header *hdr = data;
1307
d67ae825
TH		 1308 if (ff_layout_setup_sequence(hdr->ds_clp,
1309 &hdr->args.seq_args,
1310 &hdr->res.seq_res,
1311 task))
1312 return;
1313
abcb7bfc
TM		 1314 if (ff_layout_write_prepare_common(task, hdr))
1315 return;
1316
d67ae825
TH		 1317 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1318 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1319 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1320}
1321
1322static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1323{
1324 struct nfs_pgio_header *hdr = data;
1325
abcb7bfc
TM		 1326 nfs4_ff_layout_stat_io_end_write(task,
1327 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1328 hdr->args.count, hdr->res.count,
1329 hdr->res.verf->committed);
1330
d67ae825
TH		 1331 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1332 task->tk_status == 0) {
1333 nfs4_sequence_done(task, &hdr->res.seq_res);
1334 return;
1335 }
1336
1337 /* Note this may cause RPC to be resent */
1338 hdr->mds_ops->rpc_call_done(task, hdr);
1339}
1340
1341static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1342{
1343 struct nfs_pgio_header *hdr = data;
1344
1345 rpc_count_iostats_metrics(task,
1346 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1347}
1348
abcb7bfc
TM		 1349static void ff_layout_commit_prepare_common(struct rpc_task *task,
1350 struct nfs_commit_data *cdata)
1351{
1352 nfs4_ff_layout_stat_io_start_write(
1353 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1354 0, task->tk_start);
abcb7bfc
TM		 1355}
1356
d67ae825
TH		 1357static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1358{
abcb7bfc 1359 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1360 rpc_call_start(task);
1361}
1362
1363static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1364{
1365 struct nfs_commit_data *wdata = data;
1366
abcb7bfc 1367 if (ff_layout_setup_sequence(wdata->ds_clp,
d67ae825
TH		 1368 &wdata->args.seq_args,
1369 &wdata->res.seq_res,
abcb7bfc
TM		 1370 task))
1371 return;
1372 ff_layout_commit_prepare_common(task, data);
1373}
1374
1375static void ff_layout_commit_done(struct rpc_task *task, void *data)
1376{
1377 struct nfs_commit_data *cdata = data;
1378 struct nfs_page *req;
1379 __u64 count = 0;
1380
1381 if (task->tk_status == 0) {
1382 list_for_each_entry(req, &cdata->pages, wb_list)
1383 count += req->wb_bytes;
1384 }
1385
1386 nfs4_ff_layout_stat_io_end_write(task,
1387 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1388 count, count, NFS_FILE_SYNC);
1389
1390 pnfs_generic_write_commit_done(task, data);
d67ae825
TH		 1391}
1392
1393static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1394{
1395 struct nfs_commit_data *cdata = data;
1396
1397 rpc_count_iostats_metrics(task,
1398 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1399}
1400
1401static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1402 .rpc_call_prepare = ff_layout_read_prepare_v3,
1403 .rpc_call_done = ff_layout_read_call_done,
1404 .rpc_count_stats = ff_layout_read_count_stats,
1405 .rpc_release = pnfs_generic_rw_release,
1406};
1407
1408static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1409 .rpc_call_prepare = ff_layout_read_prepare_v4,
1410 .rpc_call_done = ff_layout_read_call_done,
1411 .rpc_count_stats = ff_layout_read_count_stats,
1412 .rpc_release = pnfs_generic_rw_release,
1413};
1414
1415static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1416 .rpc_call_prepare = ff_layout_write_prepare_v3,
1417 .rpc_call_done = ff_layout_write_call_done,
1418 .rpc_count_stats = ff_layout_write_count_stats,
1419 .rpc_release = pnfs_generic_rw_release,
1420};
1421
1422static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1423 .rpc_call_prepare = ff_layout_write_prepare_v4,
1424 .rpc_call_done = ff_layout_write_call_done,
1425 .rpc_count_stats = ff_layout_write_count_stats,
1426 .rpc_release = pnfs_generic_rw_release,
1427};
1428
1429static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1430 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1431 .rpc_call_done = ff_layout_commit_done,
d67ae825
TH		 1432 .rpc_count_stats = ff_layout_commit_count_stats,
1433 .rpc_release = pnfs_generic_commit_release,
1434};
1435
1436static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1437 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1438 .rpc_call_done = ff_layout_commit_done,
d67ae825
TH		 1439 .rpc_count_stats = ff_layout_commit_count_stats,
1440 .rpc_release = pnfs_generic_commit_release,
1441};
1442
1443static enum pnfs_try_status
1444ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1445{
1446 struct pnfs_layout_segment *lseg = hdr->lseg;
1447 struct nfs4_pnfs_ds *ds;
1448 struct rpc_clnt *ds_clnt;
1449 struct rpc_cred *ds_cred;
1450 loff_t offset = hdr->args.offset;
1451 u32 idx = hdr->pgio_mirror_idx;
1452 int vers;
1453 struct nfs_fh *fh;
1454
1455 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1456 __func__, hdr->inode->i_ino,
1457 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1458
1459 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1460 if (!ds)
1461 goto out_failed;
1462
1463 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1464 hdr->inode);
1465 if (IS_ERR(ds_clnt))
1466 goto out_failed;
1467
1468 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1469 if (IS_ERR(ds_cred))
1470 goto out_failed;
1471
1472 vers = nfs4_ff_layout_ds_version(lseg, idx);
1473
1474 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1475 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1476
1477 atomic_inc(&ds->ds_clp->cl_count);
1478 hdr->ds_clp = ds->ds_clp;
1479 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1480 if (fh)
1481 hdr->args.fh = fh;
d67ae825
TH		 1482 /*
1483 * Note that if we ever decide to split across DSes,
1484 * then we may need to handle dense-like offsets.
1485 */
1486 hdr->args.offset = offset;
1487 hdr->mds_offset = offset;
1488
1489 /* Perform an asynchronous read to ds */
1490 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1491 vers == 3 ? &ff_layout_read_call_ops_v3 :
1492 &ff_layout_read_call_ops_v4,
1493 0, RPC_TASK_SOFTCONN);
1494
1495 return PNFS_ATTEMPTED;
1496
1497out_failed:
1498 if (ff_layout_has_available_ds(lseg))
1499 return PNFS_TRY_AGAIN;
1500 return PNFS_NOT_ATTEMPTED;
1501}
1502
1503/* Perform async writes. */
1504static enum pnfs_try_status
1505ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1506{
1507 struct pnfs_layout_segment *lseg = hdr->lseg;
1508 struct nfs4_pnfs_ds *ds;
1509 struct rpc_clnt *ds_clnt;
1510 struct rpc_cred *ds_cred;
1511 loff_t offset = hdr->args.offset;
1512 int vers;
1513 struct nfs_fh *fh;
1514 int idx = hdr->pgio_mirror_idx;
1515
1516 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1517 if (!ds)
1518 return PNFS_NOT_ATTEMPTED;
1519
1520 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1521 hdr->inode);
1522 if (IS_ERR(ds_clnt))
1523 return PNFS_NOT_ATTEMPTED;
1524
1525 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1526 if (IS_ERR(ds_cred))
1527 return PNFS_NOT_ATTEMPTED;
1528
1529 vers = nfs4_ff_layout_ds_version(lseg, idx);
1530
1531 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1532 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1533 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1534 vers);
1535
1536 hdr->pgio_done_cb = ff_layout_write_done_cb;
1537 atomic_inc(&ds->ds_clp->cl_count);
1538 hdr->ds_clp = ds->ds_clp;
1539 hdr->ds_commit_idx = idx;
1540 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1541 if (fh)
1542 hdr->args.fh = fh;
1543
1544 /*
1545 * Note that if we ever decide to split across DSes,
1546 * then we may need to handle dense-like offsets.
1547 */
1548 hdr->args.offset = offset;
1549
1550 /* Perform an asynchronous write */
1551 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1552 vers == 3 ? &ff_layout_write_call_ops_v3 :
1553 &ff_layout_write_call_ops_v4,
1554 sync, RPC_TASK_SOFTCONN);
1555 return PNFS_ATTEMPTED;
1556}
1557
d67ae825
TH		 1558static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1559{
1560 return i;
1561}
1562
1563static struct nfs_fh *
1564select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1565{
1566 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1567
1568 /* FIXME: Assume that there is only one NFS version available
1569 * for the DS.
1570 */
1571 return &flseg->mirror_array[i]->fh_versions[0];
1572}
1573
1574static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1575{
1576 struct pnfs_layout_segment *lseg = data->lseg;
1577 struct nfs4_pnfs_ds *ds;
1578 struct rpc_clnt *ds_clnt;
1579 struct rpc_cred *ds_cred;
1580 u32 idx;
1581 int vers;
1582 struct nfs_fh *fh;
1583
1584 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1585 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1586 if (!ds)
1587 goto out_err;
1588
1589 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1590 data->inode);
1591 if (IS_ERR(ds_clnt))
1592 goto out_err;
1593
1594 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1595 if (IS_ERR(ds_cred))
1596 goto out_err;
1597
1598 vers = nfs4_ff_layout_ds_version(lseg, idx);
1599
1600 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1601 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1602 vers);
1603 data->commit_done_cb = ff_layout_commit_done_cb;
1604 data->cred = ds_cred;
1605 atomic_inc(&ds->ds_clp->cl_count);
1606 data->ds_clp = ds->ds_clp;
1607 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1608 if (fh)
1609 data->args.fh = fh;
abcb7bfc 1610
d67ae825
TH		 1611 return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1612 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1613 &ff_layout_commit_call_ops_v4,
1614 how, RPC_TASK_SOFTCONN);
1615out_err:
1616 pnfs_generic_prepare_to_resend_writes(data);
1617 pnfs_generic_commit_release(data);
1618 return -EAGAIN;
1619}
1620
1621static int
1622ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1623 int how, struct nfs_commit_info *cinfo)
1624{
1625 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1626 ff_layout_initiate_commit);
1627}
1628
1629static struct pnfs_ds_commit_info *
1630ff_layout_get_ds_info(struct inode *inode)
1631{
1632 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1633
1634 if (layout == NULL)
1635 return NULL;
1636
1637 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1638}
1639
1640static void
fc87701b 1641ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1642{
1643 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1644 id_node));
1645}
1646
1647static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1648 struct xdr_stream *xdr,
1649 const struct nfs4_layoutreturn_args *args)
1650{
1651 struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
1652 __be32 *start;
1653 int count = 0, ret = 0;
1654
1655 start = xdr_reserve_space(xdr, 4);
1656 if (unlikely(!start))
1657 return -E2BIG;
1658
1659 /* This assume we always return _ALL_ layouts */
1660 spin_lock(&hdr->plh_inode->i_lock);
1661 ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
1662 spin_unlock(&hdr->plh_inode->i_lock);
1663
1664 *start = cpu_to_be32(count);
1665
1666 return ret;
1667}
1668
1669/* report nothing for now */
1670static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1671 struct xdr_stream *xdr,
1672 const struct nfs4_layoutreturn_args *args)
1673{
1674 __be32 *p;
1675
1676 p = xdr_reserve_space(xdr, 4);
1677 if (likely(p))
1678 *p = cpu_to_be32(0);
1679}
1680
1681static struct nfs4_deviceid_node *
1682ff_layout_alloc_deviceid_node(struct nfs_server *server,
1683 struct pnfs_device *pdev, gfp_t gfp_flags)
1684{
1685 struct nfs4_ff_layout_ds *dsaddr;
1686
1687 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
1688 if (!dsaddr)
1689 return NULL;
1690 return &dsaddr->id_node;
1691}
1692
1693static void
1694ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
1695 struct xdr_stream *xdr,
1696 const struct nfs4_layoutreturn_args *args)
1697{
1698 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
1699 __be32 *start;
1700
1701 dprintk("%s: Begin\n", __func__);
1702 start = xdr_reserve_space(xdr, 4);
1703 BUG_ON(!start);
1704
1705 if (ff_layout_encode_ioerr(flo, xdr, args))
1706 goto out;
1707
1708 ff_layout_encode_iostats(flo, xdr, args);
1709out:
1710 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1711 dprintk("%s: Return\n", __func__);
1712}
1713
27c43064
PT		 1714static int
1715ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
1716{
1717 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
1718
1719 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
1720}
1721
1722static size_t
1723ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
1724 const int buflen)
1725{
1726 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
1727 const struct in6_addr *addr = &sin6->sin6_addr;
1728
1729 /*
1730 * RFC 4291, Section 2.2.2
1731 *
1732 * Shorthanded ANY address
1733 */
1734 if (ipv6_addr_any(addr))
1735 return snprintf(buf, buflen, "::");
1736
1737 /*
1738 * RFC 4291, Section 2.2.2
1739 *
1740 * Shorthanded loopback address
1741 */
1742 if (ipv6_addr_loopback(addr))
1743 return snprintf(buf, buflen, "::1");
1744
1745 /*
1746 * RFC 4291, Section 2.2.3
1747 *
1748 * Special presentation address format for mapped v4
1749 * addresses.
1750 */
1751 if (ipv6_addr_v4mapped(addr))
1752 return snprintf(buf, buflen, "::ffff:%pI4",
1753 &addr->s6_addr32[3]);
1754
1755 /*
1756 * RFC 4291, Section 2.2.1
1757 */
1758 return snprintf(buf, buflen, "%pI6c", addr);
1759}
1760
1761/* Derived from rpc_sockaddr2uaddr */
1762static void
1763ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
1764{
1765 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
1766 char portbuf[RPCBIND_MAXUADDRPLEN];
1767 char addrbuf[RPCBIND_MAXUADDRLEN];
1768 char *netid;
1769 unsigned short port;
1770 int len, netid_len;
1771 __be32 *p;
1772
1773 switch (sap->sa_family) {
1774 case AF_INET:
1775 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
1776 return;
1777 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1778 netid = "tcp";
1779 netid_len = 3;
1780 break;
1781 case AF_INET6:
1782 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
1783 return;
1784 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
1785 netid = "tcp6";
1786 netid_len = 4;
1787 break;
1788 default:
1789 /* we only support tcp and tcp6 */
1790 WARN_ON_ONCE(1);
1791 return;
1792 }
1793
1794 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
1795 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
1796
1797 p = xdr_reserve_space(xdr, 4 + netid_len);
1798 xdr_encode_opaque(p, netid, netid_len);
1799
1800 p = xdr_reserve_space(xdr, 4 + len);
1801 xdr_encode_opaque(p, addrbuf, len);
1802}
1803
1804static void
1805ff_layout_encode_nfstime(struct xdr_stream *xdr,
1806 ktime_t t)
1807{
1808 struct timespec64 ts;
1809 __be32 *p;
1810
1811 p = xdr_reserve_space(xdr, 12);
1812 ts = ktime_to_timespec64(t);
1813 p = xdr_encode_hyper(p, ts.tv_sec);
1814 *p++ = cpu_to_be32(ts.tv_nsec);
1815}
1816
1817static void
1818ff_layout_encode_io_latency(struct xdr_stream *xdr,
1819 struct nfs4_ff_io_stat *stat)
1820{
1821 __be32 *p;
1822
1823 p = xdr_reserve_space(xdr, 5 * 8);
1824 p = xdr_encode_hyper(p, stat->ops_requested);
1825 p = xdr_encode_hyper(p, stat->bytes_requested);
1826 p = xdr_encode_hyper(p, stat->ops_completed);
1827 p = xdr_encode_hyper(p, stat->bytes_completed);
1828 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
1829 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
1830 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
1831}
1832
1833static void
1834ff_layout_encode_layoutstats(struct xdr_stream *xdr,
1835 struct nfs42_layoutstat_args *args,
1836 struct nfs42_layoutstat_devinfo *devinfo)
1837{
1838 struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private;
1839 struct nfs4_pnfs_ds_addr *da;
1840 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
1841 struct nfs_fh *fh = &mirror->fh_versions[0];
1842 __be32 *p, *start;
1843
1844 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
1845 dprintk("%s: DS %s: encoding address %s\n",
1846 __func__, ds->ds_remotestr, da->da_remotestr);
1847 /* layoutupdate length */
1848 start = xdr_reserve_space(xdr, 4);
1849 /* netaddr4 */
1850 ff_layout_encode_netaddr(xdr, da);
1851 /* nfs_fh4 */
1852 p = xdr_reserve_space(xdr, 4 + fh->size);
1853 xdr_encode_opaque(p, fh->data, fh->size);
1854 /* ff_io_latency4 read */
1855 spin_lock(&mirror->lock);
1856 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
1857 /* ff_io_latency4 write */
1858 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
1859 spin_unlock(&mirror->lock);
1860 /* nfstime4 */
1861 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
1862 /* bool */
1863 p = xdr_reserve_space(xdr, 4);
1864 *p = cpu_to_be32(false);
1865
1866 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1867}
1868
ad4dc53e
PT		 1869static bool
1870ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
1871 struct pnfs_layout_segment *pls,
1872 int *dev_count, int dev_limit)
1873{
1874 struct nfs4_ff_layout_mirror *mirror;
1875 struct nfs4_deviceid_node *dev;
1876 struct nfs42_layoutstat_devinfo *devinfo;
1877 int i;
1878
690edcfa 1879 for (i = 0; i < FF_LAYOUT_MIRROR_COUNT(pls); i++) {
ad4dc53e
PT		 1880 if (*dev_count >= dev_limit)
1881 break;
1882 mirror = FF_LAYOUT_COMP(pls, i);
27c43064
PT		 1883 if (!mirror || !mirror->mirror_ds)
1884 continue;
ad4dc53e
PT		 1885 dev = FF_LAYOUT_DEVID_NODE(pls, i);
1886 devinfo = &args->devinfo[*dev_count];
1887 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
1888 devinfo->offset = pls->pls_range.offset;
1889 devinfo->length = pls->pls_range.length;
d099d7b8 1890 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 1891 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 1892 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e
PT		 1893 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
1894 devinfo->layout_type = LAYOUT_FLEX_FILES;
27c43064
PT		 1895 devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
1896 devinfo->layout_private = mirror;
1897 /* lseg refcount put in cleanup_layoutstats */
1898 pnfs_get_lseg(pls);
ad4dc53e
PT		 1899
1900 ++(*dev_count);
1901 }
1902
1903 return *dev_count < dev_limit;
1904}
1905
1906static int
1907ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
1908{
1909 struct pnfs_layout_segment *pls;
1910 int dev_count = 0;
1911
1912 spin_lock(&args->inode->i_lock);
1913 list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
1914 dev_count += FF_LAYOUT_MIRROR_COUNT(pls);
1915 }
1916 spin_unlock(&args->inode->i_lock);
1917 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
1918 if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
1919 dprintk("%s: truncating devinfo to limit (%d:%d)\n",
1920 __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
1921 dev_count = PNFS_LAYOUTSTATS_MAXDEV;
1922 }
1923 args->devinfo = kmalloc(dev_count * sizeof(*args->devinfo), GFP_KERNEL);
1924 if (!args->devinfo)
1925 return -ENOMEM;
1926
1927 dev_count = 0;
1928 spin_lock(&args->inode->i_lock);
1929 list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
1930 if (!ff_layout_mirror_prepare_stats(args, pls, &dev_count,
1931 PNFS_LAYOUTSTATS_MAXDEV)) {
1932 break;
1933 }
1934 }
1935 spin_unlock(&args->inode->i_lock);
1936 args->num_dev = dev_count;
1937
1938 return 0;
1939}
1940
27c43064
PT		 1941static void
1942ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data)
1943{
1944 struct nfs4_ff_layout_mirror *mirror;
1945 int i;
1946
1947 for (i = 0; i < data->args.num_dev; i++) {
1948 mirror = data->args.devinfo[i].layout_private;
1949 data->args.devinfo[i].layout_private = NULL;
1950 pnfs_put_lseg(mirror->lseg);
1951 }
1952}
1953
d67ae825
TH		 1954static struct pnfs_layoutdriver_type flexfilelayout_type = {
1955 .id = LAYOUT_FLEX_FILES,
1956 .name = "LAYOUT_FLEX_FILES",
1957 .owner = THIS_MODULE,
1958 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
1959 .free_layout_hdr = ff_layout_free_layout_hdr,
1960 .alloc_lseg = ff_layout_alloc_lseg,
1961 .free_lseg = ff_layout_free_lseg,
1962 .pg_read_ops = &ff_layout_pg_read_ops,
1963 .pg_write_ops = &ff_layout_pg_write_ops,
1964 .get_ds_info = ff_layout_get_ds_info,
fc87701b 1965 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 1966 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 1967 .clear_request_commit = pnfs_generic_clear_request_commit,
1968 .scan_commit_lists = pnfs_generic_scan_commit_lists,
1969 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
1970 .commit_pagelist = ff_layout_commit_pagelist,
1971 .read_pagelist = ff_layout_read_pagelist,
1972 .write_pagelist = ff_layout_write_pagelist,
1973 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
1974 .encode_layoutreturn = ff_layout_encode_layoutreturn,
5bb89b47 1975 .sync = pnfs_nfs_generic_sync,
ad4dc53e 1976 .prepare_layoutstats = ff_layout_prepare_layoutstats,
27c43064 1977 .cleanup_layoutstats = ff_layout_cleanup_layoutstats,
d67ae825
TH		 1978};
1979
1980static int __init nfs4flexfilelayout_init(void)
1981{
1982 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
1983 __func__);
1984 return pnfs_register_layoutdriver(&flexfilelayout_type);
1985}
1986
1987static void __exit nfs4flexfilelayout_exit(void)
1988{
1989 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
1990 __func__);
1991 pnfs_unregister_layoutdriver(&flexfilelayout_type);
1992}
1993
1994MODULE_ALIAS("nfs-layouttype4-4");
1995
1996MODULE_LICENSE("GPL");
1997MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
1998
1999module_init(nfs4flexfilelayout_init);
2000module_exit(nfs4flexfilelayout_exit);
Michael's Linux tree.