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NFS fix COMMIT after COPY
[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)
5b9b3c85
TM		 28#define FF_LAYOUTRETURN_MAXERR 20
29
d67ae825 30
90a0be00
JL		 31static struct group_info *ff_zero_group;
32
54e4a0df
TM		 33static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
34 struct nfs_pgio_header *hdr);
230bc962
TM		 35static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
36 struct nfs42_layoutstat_devinfo *devinfo,
37 int dev_limit);
38static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
39 const struct nfs42_layoutstat_devinfo *devinfo,
40 struct nfs4_ff_layout_mirror *mirror);
54e4a0df 41
d67ae825
TH		 42static struct pnfs_layout_hdr *
43ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
44{
45 struct nfs4_flexfile_layout *ffl;
46
47 ffl = kzalloc(sizeof(*ffl), gfp_flags);
48 if (ffl) {
49 INIT_LIST_HEAD(&ffl->error_list);
266d12d4 50 INIT_LIST_HEAD(&ffl->mirrors);
1c8d477a 51 ffl->last_report_time = ktime_get();
d67ae825
TH		 52 return &ffl->generic_hdr;
53 } else
54 return NULL;
55}
56
57static void
58ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
59{
60 struct nfs4_ff_layout_ds_err *err, *n;
61
62 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
63 list) {
64 list_del(&err->list);
65 kfree(err);
66 }
67 kfree(FF_LAYOUT_FROM_HDR(lo));
68}
69
93b717fd 70static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
d67ae825
TH		 71{
72 __be32 *p;
73
74 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
75 if (unlikely(p == NULL))
76 return -ENOBUFS;
93b717fd
TM		 77 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
78 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
d67ae825
TH		 79 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
80 p[0], p[1], p[2], p[3]);
81 return 0;
82}
83
84static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
85{
86 __be32 *p;
87
88 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
89 if (unlikely(!p))
90 return -ENOBUFS;
91 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
92 nfs4_print_deviceid(devid);
93 return 0;
94}
95
96static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
97{
98 __be32 *p;
99
100 p = xdr_inline_decode(xdr, 4);
101 if (unlikely(!p))
102 return -ENOBUFS;
103 fh->size = be32_to_cpup(p++);
104 if (fh->size > sizeof(struct nfs_fh)) {
105 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
106 fh->size);
107 return -EOVERFLOW;
108 }
109 /* fh.data */
110 p = xdr_inline_decode(xdr, fh->size);
111 if (unlikely(!p))
112 return -ENOBUFS;
113 memcpy(&fh->data, p, fh->size);
114 dprintk("%s: fh len %d\n", __func__, fh->size);
115
116 return 0;
117}
118
119/*
120 * Currently only stringified uids and gids are accepted.
121 * I.e., kerberos is not supported to the DSes, so no pricipals.
122 *
123 * That means that one common function will suffice, but when
124 * principals are added, this should be split to accomodate
125 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
126 */
127static int
128decode_name(struct xdr_stream *xdr, u32 *id)
129{
130 __be32 *p;
131 int len;
132
133 /* opaque_length(4)*/
134 p = xdr_inline_decode(xdr, 4);
135 if (unlikely(!p))
136 return -ENOBUFS;
137 len = be32_to_cpup(p++);
138 if (len < 0)
139 return -EINVAL;
140
141 dprintk("%s: len %u\n", __func__, len);
142
143 /* opaque body */
144 p = xdr_inline_decode(xdr, len);
145 if (unlikely(!p))
146 return -ENOBUFS;
147
148 if (!nfs_map_string_to_numeric((char *)p, len, id))
149 return -EINVAL;
150
151 return 0;
152}
153
266d12d4
TM		 154static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
155 const struct nfs4_ff_layout_mirror *m2)
156{
157 int i, j;
158
159 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
160 return false;
161 for (i = 0; i < m1->fh_versions_cnt; i++) {
162 bool found_fh = false;
86fb449b 163 for (j = 0; j < m2->fh_versions_cnt; j++) {
266d12d4
TM		 164 if (nfs_compare_fh(&m1->fh_versions[i],
165 &m2->fh_versions[j]) == 0) {
166 found_fh = true;
167 break;
168 }
169 }
170 if (!found_fh)
171 return false;
172 }
173 return true;
174}
175
176static struct nfs4_ff_layout_mirror *
177ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
178 struct nfs4_ff_layout_mirror *mirror)
179{
180 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
181 struct nfs4_ff_layout_mirror *pos;
182 struct inode *inode = lo->plh_inode;
183
184 spin_lock(&inode->i_lock);
185 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
65990d1a 186 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
266d12d4
TM		 187 continue;
188 if (!ff_mirror_match_fh(mirror, pos))
189 continue;
190 if (atomic_inc_not_zero(&pos->ref)) {
191 spin_unlock(&inode->i_lock);
192 return pos;
193 }
194 }
195 list_add(&mirror->mirrors, &ff_layout->mirrors);
196 mirror->layout = lo;
197 spin_unlock(&inode->i_lock);
198 return mirror;
199}
200
e3b1df2d 201static void
266d12d4
TM		 202ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
203{
204 struct inode *inode;
205 if (mirror->layout == NULL)
206 return;
207 inode = mirror->layout->plh_inode;
208 spin_lock(&inode->i_lock);
209 list_del(&mirror->mirrors);
210 spin_unlock(&inode->i_lock);
211 mirror->layout = NULL;
212}
213
28a0d72c
TM		 214static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
215{
216 struct nfs4_ff_layout_mirror *mirror;
217
218 mirror = kzalloc(sizeof(*mirror), gfp_flags);
219 if (mirror != NULL) {
220 spin_lock_init(&mirror->lock);
221 atomic_set(&mirror->ref, 1);
266d12d4 222 INIT_LIST_HEAD(&mirror->mirrors);
28a0d72c
TM		 223 }
224 return mirror;
225}
226
227static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
228{
3064b686
JL		 229 struct rpc_cred *cred;
230
266d12d4 231 ff_layout_remove_mirror(mirror);
28a0d72c 232 kfree(mirror->fh_versions);
3064b686
JL		 233 cred = rcu_access_pointer(mirror->ro_cred);
234 if (cred)
235 put_rpccred(cred);
236 cred = rcu_access_pointer(mirror->rw_cred);
237 if (cred)
238 put_rpccred(cred);
28a0d72c
TM		 239 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
240 kfree(mirror);
241}
242
243static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
244{
245 if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
246 ff_layout_free_mirror(mirror);
247}
248
d67ae825
TH		 249static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
250{
251 int i;
252
253 if (fls->mirror_array) {
254 for (i = 0; i < fls->mirror_array_cnt; i++) {
255 /* normally mirror_ds is freed in
256 * .free_deviceid_node but we still do it here
257 * for .alloc_lseg error path */
28a0d72c 258 ff_layout_put_mirror(fls->mirror_array[i]);
d67ae825
TH		 259 }
260 kfree(fls->mirror_array);
261 fls->mirror_array = NULL;
262 }
263}
264
265static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
266{
267 int ret = 0;
268
269 dprintk("--> %s\n", __func__);
270
271 /* FIXME: remove this check when layout segment support is added */
272 if (lgr->range.offset != 0 ||
273 lgr->range.length != NFS4_MAX_UINT64) {
274 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
275 __func__);
276 ret = -EINVAL;
277 }
278
279 dprintk("--> %s returns %d\n", __func__, ret);
280 return ret;
281}
282
283static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
284{
285 if (fls) {
286 ff_layout_free_mirror_array(fls);
287 kfree(fls);
288 }
289}
290
0762ed2c
TM		 291static bool
292ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
293 const struct pnfs_layout_range *l2)
294{
295 u64 end1, end2;
296
297 if (l1->iomode != l2->iomode)
298 return l1->iomode != IOMODE_READ;
299 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
300 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
301 if (end1 < l2->offset)
302 return false;
303 if (end2 < l1->offset)
304 return true;
305 return l2->offset <= l1->offset;
306}
307
308static bool
309ff_lseg_merge(struct pnfs_layout_segment *new,
310 struct pnfs_layout_segment *old)
311{
312 u64 new_end, old_end;
313
ee26bdd6
JL		 314 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
315 return false;
0762ed2c
TM		 316 if (new->pls_range.iomode != old->pls_range.iomode)
317 return false;
318 old_end = pnfs_calc_offset_end(old->pls_range.offset,
319 old->pls_range.length);
320 if (old_end < new->pls_range.offset)
321 return false;
322 new_end = pnfs_calc_offset_end(new->pls_range.offset,
323 new->pls_range.length);
324 if (new_end < old->pls_range.offset)
325 return false;
326
327 /* Mergeable: copy info from 'old' to 'new' */
328 if (new_end < old_end)
329 new_end = old_end;
330 if (new->pls_range.offset < old->pls_range.offset)
331 new->pls_range.offset = old->pls_range.offset;
332 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
333 new_end);
334 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
335 set_bit(NFS_LSEG_ROC, &new->pls_flags);
0762ed2c
TM		 336 return true;
337}
338
339static void
340ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
341 struct pnfs_layout_segment *lseg,
342 struct list_head *free_me)
343{
344 pnfs_generic_layout_insert_lseg(lo, lseg,
345 ff_lseg_range_is_after,
346 ff_lseg_merge,
347 free_me);
348}
349
d67ae825
TH		 350static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
351{
d67ae825
TH		 352 int i, j;
353
354 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
355 for (j = i + 1; j < fls->mirror_array_cnt; j++)
356 if (fls->mirror_array[i]->efficiency <
455b6ee6
FF		 357 fls->mirror_array[j]->efficiency)
358 swap(fls->mirror_array[i],
359 fls->mirror_array[j]);
d67ae825
TH		 360 }
361}
362
363static struct pnfs_layout_segment *
364ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
365 struct nfs4_layoutget_res *lgr,
366 gfp_t gfp_flags)
367{
368 struct pnfs_layout_segment *ret;
369 struct nfs4_ff_layout_segment *fls = NULL;
370 struct xdr_stream stream;
371 struct xdr_buf buf;
372 struct page *scratch;
373 u64 stripe_unit;
374 u32 mirror_array_cnt;
375 __be32 *p;
376 int i, rc;
377
378 dprintk("--> %s\n", __func__);
379 scratch = alloc_page(gfp_flags);
380 if (!scratch)
381 return ERR_PTR(-ENOMEM);
382
383 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
384 lgr->layoutp->len);
385 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
386
387 /* stripe unit and mirror_array_cnt */
388 rc = -EIO;
389 p = xdr_inline_decode(&stream, 8 + 4);
390 if (!p)
391 goto out_err_free;
392
393 p = xdr_decode_hyper(p, &stripe_unit);
394 mirror_array_cnt = be32_to_cpup(p++);
395 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
396 stripe_unit, mirror_array_cnt);
397
398 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
399 mirror_array_cnt == 0)
400 goto out_err_free;
401
402 rc = -ENOMEM;
403 fls = kzalloc(sizeof(*fls), gfp_flags);
404 if (!fls)
405 goto out_err_free;
406
407 fls->mirror_array_cnt = mirror_array_cnt;
408 fls->stripe_unit = stripe_unit;
409 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
410 sizeof(fls->mirror_array[0]), gfp_flags);
411 if (fls->mirror_array == NULL)
412 goto out_err_free;
413
414 for (i = 0; i < fls->mirror_array_cnt; i++) {
266d12d4 415 struct nfs4_ff_layout_mirror *mirror;
90a0be00 416 struct auth_cred acred = { .group_info = ff_zero_group };
3064b686 417 struct rpc_cred __rcu *cred;
90a0be00 418 u32 ds_count, fh_count, id;
d67ae825
TH		 419 int j;
420
421 rc = -EIO;
422 p = xdr_inline_decode(&stream, 4);
423 if (!p)
424 goto out_err_free;
425 ds_count = be32_to_cpup(p);
426
427 /* FIXME: allow for striping? */
428 if (ds_count != 1)
429 goto out_err_free;
430
28a0d72c 431 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
d67ae825
TH		 432 if (fls->mirror_array[i] == NULL) {
433 rc = -ENOMEM;
434 goto out_err_free;
435 }
436
d67ae825
TH		 437 fls->mirror_array[i]->ds_count = ds_count;
438
439 /* deviceid */
65990d1a 440 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
d67ae825
TH		 441 if (rc)
442 goto out_err_free;
443
d67ae825
TH		 444 /* efficiency */
445 rc = -EIO;
446 p = xdr_inline_decode(&stream, 4);
447 if (!p)
448 goto out_err_free;
449 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
450
451 /* stateid */
93b717fd 452 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
d67ae825
TH		 453 if (rc)
454 goto out_err_free;
455
456 /* fh */
457 p = xdr_inline_decode(&stream, 4);
458 if (!p)
459 goto out_err_free;
460 fh_count = be32_to_cpup(p);
461
462 fls->mirror_array[i]->fh_versions =
463 kzalloc(fh_count * sizeof(struct nfs_fh),
464 gfp_flags);
465 if (fls->mirror_array[i]->fh_versions == NULL) {
466 rc = -ENOMEM;
467 goto out_err_free;
468 }
469
470 for (j = 0; j < fh_count; j++) {
471 rc = decode_nfs_fh(&stream,
472 &fls->mirror_array[i]->fh_versions[j]);
473 if (rc)
474 goto out_err_free;
475 }
476
477 fls->mirror_array[i]->fh_versions_cnt = fh_count;
478
479 /* user */
90a0be00 480 rc = decode_name(&stream, &id);
d67ae825
TH		 481 if (rc)
482 goto out_err_free;
483
90a0be00
JL		 484 acred.uid = make_kuid(&init_user_ns, id);
485
d67ae825 486 /* group */
90a0be00 487 rc = decode_name(&stream, &id);
d67ae825
TH		 488 if (rc)
489 goto out_err_free;
490
90a0be00
JL		 491 acred.gid = make_kgid(&init_user_ns, id);
492
493 /* find the cred for it */
3064b686 494 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
90a0be00
JL		 495 if (IS_ERR(cred)) {
496 rc = PTR_ERR(cred);
497 goto out_err_free;
498 }
499
3064b686
JL		 500 if (lgr->range.iomode == IOMODE_READ)
501 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
502 else
503 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
90a0be00 504
266d12d4
TM		 505 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
506 if (mirror != fls->mirror_array[i]) {
90a0be00 507 /* swap cred ptrs so free_mirror will clean up old */
3064b686
JL		 508 if (lgr->range.iomode == IOMODE_READ) {
509 cred = xchg(&mirror->ro_cred, cred);
510 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
511 } else {
512 cred = xchg(&mirror->rw_cred, cred);
513 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
514 }
266d12d4
TM		 515 ff_layout_free_mirror(fls->mirror_array[i]);
516 fls->mirror_array[i] = mirror;
517 }
518
3064b686
JL		 519 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
520 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
90a0be00
JL		 521 from_kuid(&init_user_ns, acred.uid),
522 from_kgid(&init_user_ns, acred.gid));
d67ae825
TH		 523 }
524
c0f5f505 525 p = xdr_inline_decode(&stream, 4);
d0379a5d
TM		 526 if (!p)
527 goto out_sort_mirrors;
528 fls->flags = be32_to_cpup(p);
529
530 p = xdr_inline_decode(&stream, 4);
531 if (!p)
532 goto out_sort_mirrors;
533 for (i=0; i < fls->mirror_array_cnt; i++)
534 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
c0f5f505 535
d0379a5d 536out_sort_mirrors:
d67ae825
TH		 537 ff_layout_sort_mirrors(fls);
538 rc = ff_layout_check_layout(lgr);
539 if (rc)
540 goto out_err_free;
d67ae825
TH		 541 ret = &fls->generic_hdr;
542 dprintk("<-- %s (success)\n", __func__);
543out_free_page:
544 __free_page(scratch);
545 return ret;
546out_err_free:
547 _ff_layout_free_lseg(fls);
548 ret = ERR_PTR(rc);
549 dprintk("<-- %s (%d)\n", __func__, rc);
550 goto out_free_page;
551}
552
553static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
554{
555 struct pnfs_layout_segment *lseg;
556
557 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
558 if (lseg->pls_range.iomode == IOMODE_RW)
559 return true;
560
561 return false;
562}
563
564static void
565ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
566{
567 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 568
569 dprintk("--> %s\n", __func__);
570
d67ae825
TH		 571 if (lseg->pls_range.iomode == IOMODE_RW) {
572 struct nfs4_flexfile_layout *ffl;
573 struct inode *inode;
574
575 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
576 inode = ffl->generic_hdr.plh_inode;
577 spin_lock(&inode->i_lock);
578 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
579 ffl->commit_info.nbuckets = 0;
580 kfree(ffl->commit_info.buckets);
581 ffl->commit_info.buckets = NULL;
582 }
583 spin_unlock(&inode->i_lock);
584 }
585 _ff_layout_free_lseg(fls);
586}
587
588/* Return 1 until we have multiple lsegs support */
589static int
590ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
591{
592 return 1;
593}
594
abcb7bfc 595static void
e76d28dd 596nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 597{
9bbd9bb4
PT		 598 /* first IO request? */
599 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 600 timer->start_time = now;
abcb7bfc
TM		 601 }
602}
603
604static ktime_t
e76d28dd 605nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 606{
e76d28dd 607 ktime_t start;
abcb7bfc 608
9bbd9bb4
PT		 609 if (atomic_dec_return(&timer->n_ops) < 0)
610 WARN_ON_ONCE(1);
611
9bbd9bb4
PT		 612 start = timer->start_time;
613 timer->start_time = now;
abcb7bfc
TM		 614 return ktime_sub(now, start);
615}
616
97ba375b 617static bool
d983803d 618nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 619 struct nfs4_ff_layoutstat *layoutstat,
620 ktime_t now)
abcb7bfc 621{
bbf58bf3 622 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
1c8d477a 623 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
d983803d 624
e76d28dd 625 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
1f3a8e49 626 if (!mirror->start_time)
9bbd9bb4 627 mirror->start_time = now;
d0379a5d
TM		 628 if (mirror->report_interval != 0)
629 report_interval = (s64)mirror->report_interval * 1000LL;
630 else if (layoutstats_timer != 0)
bbf58bf3 631 report_interval = (s64)layoutstats_timer * 1000LL;
1c8d477a 632 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
bbf58bf3 633 report_interval) {
1c8d477a 634 ffl->last_report_time = now;
97ba375b
PT		 635 return true;
636 }
637
638 return false;
abcb7bfc
TM		 639}
640
641static void
642nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
643 __u64 requested)
644{
645 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
646
647 iostat->ops_requested++;
648 iostat->bytes_requested += requested;
649}
650
651static void
652nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
653 __u64 requested,
654 __u64 completed,
e76d28dd
TM		 655 ktime_t time_completed,
656 ktime_t time_started)
abcb7bfc
TM		 657{
658 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 659 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 660 ktime_t timer;
661
662 iostat->ops_completed++;
663 iostat->bytes_completed += completed;
664 iostat->bytes_not_delivered += requested - completed;
665
e76d28dd 666 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 667 iostat->total_busy_time =
668 ktime_add(iostat->total_busy_time, timer);
669 iostat->aggregate_completion_time =
e76d28dd
TM		 670 ktime_add(iostat->aggregate_completion_time,
671 completion_time);
abcb7bfc
TM		 672}
673
674static void
0b7baf94
TM		 675nfs4_ff_layout_stat_io_start_read(struct inode *inode,
676 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 677 __u64 requested, ktime_t now)
abcb7bfc 678{
97ba375b
PT		 679 bool report;
680
abcb7bfc 681 spin_lock(&mirror->lock);
e76d28dd 682 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
abcb7bfc 683 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
06946c6a 684 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 685 spin_unlock(&mirror->lock);
97ba375b
PT		 686
687 if (report)
0b7baf94 688 pnfs_report_layoutstat(inode, GFP_KERNEL);
abcb7bfc
TM		 689}
690
691static void
692nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
693 struct nfs4_ff_layout_mirror *mirror,
694 __u64 requested,
695 __u64 completed)
696{
697 spin_lock(&mirror->lock);
698 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
699 requested, completed,
e76d28dd 700 ktime_get(), task->tk_start);
06946c6a 701 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 702 spin_unlock(&mirror->lock);
703}
704
705static void
0b7baf94
TM		 706nfs4_ff_layout_stat_io_start_write(struct inode *inode,
707 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 708 __u64 requested, ktime_t now)
abcb7bfc 709{
97ba375b
PT		 710 bool report;
711
abcb7bfc 712 spin_lock(&mirror->lock);
e76d28dd 713 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc 714 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
06946c6a 715 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 716 spin_unlock(&mirror->lock);
97ba375b
PT		 717
718 if (report)
0b7baf94 719 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 720}
721
722static void
723nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
724 struct nfs4_ff_layout_mirror *mirror,
725 __u64 requested,
726 __u64 completed,
727 enum nfs3_stable_how committed)
728{
729 if (committed == NFS_UNSTABLE)
730 requested = completed = 0;
731
732 spin_lock(&mirror->lock);
733 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 734 requested, completed, ktime_get(), task->tk_start);
06946c6a 735 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 736 spin_unlock(&mirror->lock);
737}
738
d67ae825
TH		 739static int
740ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
741 struct nfs_commit_info *cinfo,
742 gfp_t gfp_flags)
743{
744 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
745 struct pnfs_commit_bucket *buckets;
746 int size;
747
748 if (cinfo->ds->nbuckets != 0) {
749 /* This assumes there is only one RW lseg per file.
750 * To support multiple lseg per file, we need to
751 * change struct pnfs_commit_bucket to allow dynamic
752 * increasing nbuckets.
753 */
754 return 0;
755 }
756
757 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
758
759 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
760 gfp_flags);
761 if (!buckets)
762 return -ENOMEM;
763 else {
764 int i;
765
fe238e60 766 spin_lock(&cinfo->inode->i_lock);
d67ae825
TH		 767 if (cinfo->ds->nbuckets != 0)
768 kfree(buckets);
769 else {
770 cinfo->ds->buckets = buckets;
771 cinfo->ds->nbuckets = size;
772 for (i = 0; i < size; i++) {
773 INIT_LIST_HEAD(&buckets[i].written);
774 INIT_LIST_HEAD(&buckets[i].committing);
775 /* mark direct verifier as unset */
776 buckets[i].direct_verf.committed =
777 NFS_INVALID_STABLE_HOW;
778 }
779 }
fe238e60 780 spin_unlock(&cinfo->inode->i_lock);
d67ae825
TH		 781 return 0;
782 }
783}
784
785static struct nfs4_pnfs_ds *
13544412
TM		 786ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
787 int start_idx,
d67ae825
TH		 788 int *best_idx)
789{
13544412 790 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825 791 struct nfs4_pnfs_ds *ds;
3dc14735 792 bool fail_return = false;
d67ae825
TH		 793 int idx;
794
d67ae825 795 /* mirrors are sorted by efficiency */
13544412 796 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
3dc14735
TM		 797 if (idx+1 == fls->mirror_array_cnt)
798 fail_return = true;
799 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
d67ae825
TH		 800 if (ds) {
801 *best_idx = idx;
802 return ds;
803 }
804 }
805
806 return NULL;
807}
808
c7d73af2
TH		 809static void
810ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
811 struct nfs_page *req,
812 bool strict_iomode)
813{
814retry_strict:
815 pnfs_put_lseg(pgio->pg_lseg);
816 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
817 req->wb_context,
818 0,
819 NFS4_MAX_UINT64,
820 IOMODE_READ,
821 strict_iomode,
822 GFP_KERNEL);
823 if (IS_ERR(pgio->pg_lseg)) {
824 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
825 pgio->pg_lseg = NULL;
826 }
827
828 /* If we don't have checking, do get a IOMODE_RW
829 * segment, and the server wants to avoid READs
830 * there, then retry!
831 */
832 if (pgio->pg_lseg && !strict_iomode &&
833 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
834 strict_iomode = true;
835 goto retry_strict;
836 }
837}
838
d67ae825
TH		 839static void
840ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
841 struct nfs_page *req)
842{
843 struct nfs_pgio_mirror *pgm;
844 struct nfs4_ff_layout_mirror *mirror;
845 struct nfs4_pnfs_ds *ds;
846 int ds_idx;
847
3dc14735 848retry:
b3230e80 849 pnfs_generic_pg_check_layout(pgio);
d67ae825 850 /* Use full layout for now */
c7d73af2
TH		 851 if (!pgio->pg_lseg)
852 ff_layout_pg_get_read(pgio, req, false);
853 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
854 ff_layout_pg_get_read(pgio, req, true);
602c4cd4 855
d67ae825
TH		 856 /* If no lseg, fall back to read through mds */
857 if (pgio->pg_lseg == NULL)
858 goto out_mds;
859
13544412 860 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
446ca219 861 if (!ds) {
3dc14735 862 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 863 goto out_mds;
3dc14735
TM		 864 pnfs_put_lseg(pgio->pg_lseg);
865 pgio->pg_lseg = NULL;
866 /* Sleep for 1 second before retrying */
867 ssleep(1);
868 goto retry;
446ca219
TH		 869 }
870
d67ae825
TH		 871 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
872
873 pgio->pg_mirror_idx = ds_idx;
874
875 /* read always uses only one mirror - idx 0 for pgio layer */
876 pgm = &pgio->pg_mirrors[0];
877 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
878
879 return;
880out_mds:
881 pnfs_put_lseg(pgio->pg_lseg);
882 pgio->pg_lseg = NULL;
883 nfs_pageio_reset_read_mds(pgio);
884}
885
886static void
887ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
888 struct nfs_page *req)
889{
890 struct nfs4_ff_layout_mirror *mirror;
891 struct nfs_pgio_mirror *pgm;
892 struct nfs_commit_info cinfo;
893 struct nfs4_pnfs_ds *ds;
894 int i;
895 int status;
896
3dc14735 897retry:
b3230e80 898 pnfs_generic_pg_check_layout(pgio);
d600ad1f 899 if (!pgio->pg_lseg) {
d67ae825
TH		 900 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
901 req->wb_context,
902 0,
903 NFS4_MAX_UINT64,
904 IOMODE_RW,
c7d73af2 905 false,
d67ae825 906 GFP_NOFS);
d600ad1f
PT		 907 if (IS_ERR(pgio->pg_lseg)) {
908 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
909 pgio->pg_lseg = NULL;
910 return;
911 }
912 }
d67ae825
TH		 913 /* If no lseg, fall back to write through mds */
914 if (pgio->pg_lseg == NULL)
915 goto out_mds;
916
917 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
918 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
919 if (status < 0)
920 goto out_mds;
921
922 /* Use a direct mapping of ds_idx to pgio mirror_idx */
923 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
924 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
925 goto out_mds;
926
927 for (i = 0; i < pgio->pg_mirror_count; i++) {
928 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
446ca219 929 if (!ds) {
3dc14735 930 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 931 goto out_mds;
3dc14735
TM		 932 pnfs_put_lseg(pgio->pg_lseg);
933 pgio->pg_lseg = NULL;
934 /* Sleep for 1 second before retrying */
935 ssleep(1);
936 goto retry;
446ca219 937 }
d67ae825
TH		 938 pgm = &pgio->pg_mirrors[i];
939 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
940 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
941 }
942
943 return;
944
945out_mds:
946 pnfs_put_lseg(pgio->pg_lseg);
947 pgio->pg_lseg = NULL;
948 nfs_pageio_reset_write_mds(pgio);
949}
950
951static unsigned int
952ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
953 struct nfs_page *req)
954{
d600ad1f 955 if (!pgio->pg_lseg) {
d67ae825
TH		 956 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
957 req->wb_context,
958 0,
959 NFS4_MAX_UINT64,
960 IOMODE_RW,
c7d73af2 961 false,
d67ae825 962 GFP_NOFS);
d600ad1f
PT		 963 if (IS_ERR(pgio->pg_lseg)) {
964 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
965 pgio->pg_lseg = NULL;
966 goto out;
967 }
968 }
d67ae825
TH		 969 if (pgio->pg_lseg)
970 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
971
972 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 973 nfs_pageio_reset_write_mds(pgio);
d600ad1f 974out:
d67ae825
TH		 975 return 1;
976}
977
978static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
979 .pg_init = ff_layout_pg_init_read,
980 .pg_test = pnfs_generic_pg_test,
981 .pg_doio = pnfs_generic_pg_readpages,
982 .pg_cleanup = pnfs_generic_pg_cleanup,
983};
984
985static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
986 .pg_init = ff_layout_pg_init_write,
987 .pg_test = pnfs_generic_pg_test,
988 .pg_doio = pnfs_generic_pg_writepages,
989 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
990 .pg_cleanup = pnfs_generic_pg_cleanup,
991};
992
993static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
994{
995 struct rpc_task *task = &hdr->task;
996
997 pnfs_layoutcommit_inode(hdr->inode, false);
998
999 if (retry_pnfs) {
1000 dprintk("%s Reset task %5u for i/o through pNFS "
1001 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1002 hdr->task.tk_pid,
1003 hdr->inode->i_sb->s_id,
1004 (unsigned long long)NFS_FILEID(hdr->inode),
1005 hdr->args.count,
1006 (unsigned long long)hdr->args.offset);
1007
dc602dd7 1008 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1009 return;
1010 }
1011
1012 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1013 dprintk("%s Reset task %5u for i/o through MDS "
1014 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1015 hdr->task.tk_pid,
1016 hdr->inode->i_sb->s_id,
1017 (unsigned long long)NFS_FILEID(hdr->inode),
1018 hdr->args.count,
1019 (unsigned long long)hdr->args.offset);
1020
1021 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1022 }
1023}
1024
1025static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1026{
1027 struct rpc_task *task = &hdr->task;
1028
1029 pnfs_layoutcommit_inode(hdr->inode, false);
1030
1031 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1032 dprintk("%s Reset task %5u for i/o through MDS "
1033 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1034 hdr->task.tk_pid,
1035 hdr->inode->i_sb->s_id,
1036 (unsigned long long)NFS_FILEID(hdr->inode),
1037 hdr->args.count,
1038 (unsigned long long)hdr->args.offset);
1039
1040 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1041 }
1042}
1043
1044static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1045 struct nfs4_state *state,
1046 struct nfs_client *clp,
1047 struct pnfs_layout_segment *lseg,
1048 int idx)
1049{
1050 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1051 struct inode *inode = lo->plh_inode;
1052 struct nfs_server *mds_server = NFS_SERVER(inode);
1053
1054 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1055 struct nfs_client *mds_client = mds_server->nfs_client;
1056 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1057
d67ae825
TH		 1058 switch (task->tk_status) {
1059 /* MDS state errors */
1060 case -NFS4ERR_DELEG_REVOKED:
1061 case -NFS4ERR_ADMIN_REVOKED:
1062 case -NFS4ERR_BAD_STATEID:
1063 if (state == NULL)
1064 break;
41020b67 1065 nfs_remove_bad_delegation(state->inode, NULL);
d67ae825
TH		 1066 case -NFS4ERR_OPENMODE:
1067 if (state == NULL)
1068 break;
1069 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1070 goto out_bad_stateid;
1071 goto wait_on_recovery;
1072 case -NFS4ERR_EXPIRED:
1073 if (state != NULL) {
1074 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1075 goto out_bad_stateid;
1076 }
1077 nfs4_schedule_lease_recovery(mds_client);
1078 goto wait_on_recovery;
1079 /* DS session errors */
1080 case -NFS4ERR_BADSESSION:
1081 case -NFS4ERR_BADSLOT:
1082 case -NFS4ERR_BAD_HIGH_SLOT:
1083 case -NFS4ERR_DEADSESSION:
1084 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1085 case -NFS4ERR_SEQ_FALSE_RETRY:
1086 case -NFS4ERR_SEQ_MISORDERED:
1087 dprintk("%s ERROR %d, Reset session. Exchangeid "
1088 "flags 0x%x\n", __func__, task->tk_status,
1089 clp->cl_exchange_flags);
1090 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1091 break;
1092 case -NFS4ERR_DELAY:
1093 case -NFS4ERR_GRACE:
1094 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1095 break;
1096 case -NFS4ERR_RETRY_UNCACHED_REP:
1097 break;
1098 /* Invalidate Layout errors */
1099 case -NFS4ERR_PNFS_NO_LAYOUT:
1100 case -ESTALE: /* mapped NFS4ERR_STALE */
1101 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1102 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1103 case -NFS4ERR_FHEXPIRED:
1104 case -NFS4ERR_WRONG_TYPE:
1105 dprintk("%s Invalid layout error %d\n", __func__,
1106 task->tk_status);
1107 /*
1108 * Destroy layout so new i/o will get a new layout.
1109 * Layout will not be destroyed until all current lseg
1110 * references are put. Mark layout as invalid to resend failed
1111 * i/o and all i/o waiting on the slot table to the MDS until
1112 * layout is destroyed and a new valid layout is obtained.
1113 */
1114 pnfs_destroy_layout(NFS_I(inode));
1115 rpc_wake_up(&tbl->slot_tbl_waitq);
1116 goto reset;
1117 /* RPC connection errors */
1118 case -ECONNREFUSED:
1119 case -EHOSTDOWN:
1120 case -EHOSTUNREACH:
1121 case -ENETUNREACH:
1122 case -EIO:
1123 case -ETIMEDOUT:
1124 case -EPIPE:
1125 dprintk("%s DS connection error %d\n", __func__,
1126 task->tk_status);
1c48cee8
WAA		 1127 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1128 &devid->deviceid);
d67ae825
TH		 1129 rpc_wake_up(&tbl->slot_tbl_waitq);
1130 /* fall through */
1131 default:
3b13b4b3 1132 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1133 return -NFS4ERR_RESET_TO_PNFS;
1134reset:
1135 dprintk("%s Retry through MDS. Error %d\n", __func__,
1136 task->tk_status);
1137 return -NFS4ERR_RESET_TO_MDS;
1138 }
1139out:
1140 task->tk_status = 0;
1141 return -EAGAIN;
1142out_bad_stateid:
1143 task->tk_status = -EIO;
1144 return 0;
1145wait_on_recovery:
1146 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1147 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1148 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1149 goto out;
1150}
1151
1152/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1153static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1154 struct pnfs_layout_segment *lseg,
1155 int idx)
1156{
1157 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1158
90816d1d
TM		 1159 switch (task->tk_status) {
1160 /* File access problems. Don't mark the device as unavailable */
1161 case -EACCES:
1162 case -ESTALE:
1163 case -EISDIR:
1164 case -EBADHANDLE:
1165 case -ELOOP:
1166 case -ENOSPC:
1167 break;
1168 case -EJUKEBOX:
1169 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1170 goto out_retry;
1171 default:
d67ae825
TH		 1172 dprintk("%s DS connection error %d\n", __func__,
1173 task->tk_status);
1c48cee8
WAA		 1174 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1175 &devid->deviceid);
d67ae825 1176 }
90816d1d
TM		 1177 /* FIXME: Need to prevent infinite looping here. */
1178 return -NFS4ERR_RESET_TO_PNFS;
1179out_retry:
d67ae825 1180 task->tk_status = 0;
7eeea167 1181 rpc_restart_call_prepare(task);
d67ae825
TH		 1182 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1183 return -EAGAIN;
1184}
1185
1186static int ff_layout_async_handle_error(struct rpc_task *task,
1187 struct nfs4_state *state,
1188 struct nfs_client *clp,
1189 struct pnfs_layout_segment *lseg,
1190 int idx)
1191{
1192 int vers = clp->cl_nfs_mod->rpc_vers->number;
1193
df3ab232
TM		 1194 if (task->tk_status >= 0)
1195 return 0;
1196
1197 /* Handle the case of an invalid layout segment */
1198 if (!pnfs_is_valid_lseg(lseg))
1199 return -NFS4ERR_RESET_TO_PNFS;
1200
d67ae825
TH		 1201 switch (vers) {
1202 case 3:
1203 return ff_layout_async_handle_error_v3(task, lseg, idx);
1204 case 4:
1205 return ff_layout_async_handle_error_v4(task, state, clp,
1206 lseg, idx);
1207 default:
1208 /* should never happen */
1209 WARN_ON_ONCE(1);
1210 return 0;
1211 }
1212}
1213
1214static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1215 int idx, u64 offset, u64 length,
dd52128a 1216 u32 status, int opnum, int error)
d67ae825
TH		 1217{
1218 struct nfs4_ff_layout_mirror *mirror;
1219 int err;
1220
dd52128a
TM		 1221 if (status == 0) {
1222 switch (error) {
1223 case -ETIMEDOUT:
1224 case -EPFNOSUPPORT:
1225 case -EPROTONOSUPPORT:
1226 case -EOPNOTSUPP:
1227 case -ECONNREFUSED:
1228 case -ECONNRESET:
1229 case -EHOSTDOWN:
1230 case -EHOSTUNREACH:
1231 case -ENETUNREACH:
1232 case -EADDRINUSE:
1233 case -ENOBUFS:
1234 case -EPIPE:
1235 case -EPERM:
1236 status = NFS4ERR_NXIO;
1237 break;
1238 case -EACCES:
1239 status = NFS4ERR_ACCESS;
1240 break;
1241 default:
1242 return;
1243 }
1244 }
1245
c22eeb86
PT		 1246 switch (status) {
1247 case NFS4ERR_DELAY:
1248 case NFS4ERR_GRACE:
1249 return;
1250 default:
1251 break;
1252 }
1253
d67ae825
TH		 1254 mirror = FF_LAYOUT_COMP(lseg, idx);
1255 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1256 mirror, offset, length, status, opnum,
1257 GFP_NOIO);
f95c03b2 1258 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
d67ae825
TH		 1259 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1260}
1261
1262/* NFS_PROTO call done callback routines */
d67ae825
TH		 1263static int ff_layout_read_done_cb(struct rpc_task *task,
1264 struct nfs_pgio_header *hdr)
1265{
d67ae825
TH		 1266 int err;
1267
1268 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1269 if (task->tk_status < 0)
d67ae825
TH		 1270 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1271 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1272 hdr->res.op_status, OP_READ,
1273 task->tk_status);
d67ae825
TH		 1274 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1275 hdr->ds_clp, hdr->lseg,
1276 hdr->pgio_mirror_idx);
1277
1278 switch (err) {
1279 case -NFS4ERR_RESET_TO_PNFS:
13544412
TM		 1280 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1281 hdr->pgio_mirror_idx + 1,
1282 &hdr->pgio_mirror_idx))
1283 goto out_eagain;
54e4a0df 1284 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1285 pnfs_read_resend_pnfs(hdr);
1286 return task->tk_status;
1287 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1288 ff_layout_reset_read(hdr);
1289 return task->tk_status;
1290 case -EAGAIN:
13544412 1291 goto out_eagain;
d67ae825
TH		 1292 }
1293
1294 return 0;
13544412
TM		 1295out_eagain:
1296 rpc_restart_call_prepare(task);
1297 return -EAGAIN;
d67ae825
TH		 1298}
1299
c0f5f505
TM		 1300static bool
1301ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1302{
1303 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1304}
1305
d67ae825
TH		 1306/*
1307 * We reference the rpc_cred of the first WRITE that triggers the need for
1308 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1309 * rfc5661 is not clear about which credential should be used.
1310 *
1311 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1312 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1313 * we always send layoutcommit after DS writes.
1314 */
1315static void
bc28e1c2
TM		 1316ff_layout_set_layoutcommit(struct inode *inode,
1317 struct pnfs_layout_segment *lseg,
1318 loff_t end_offset)
d67ae825 1319{
bc28e1c2 1320 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1321 return;
1322
bc28e1c2
TM		 1323 pnfs_set_layoutcommit(inode, lseg, end_offset);
1324 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1325 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1326}
1327
1328static bool
75bf47eb 1329ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
d67ae825
TH		 1330{
1331 /* No mirroring for now */
1332 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1333
1334 return ff_layout_test_devid_unavailable(node);
1335}
1336
37e9ed22
TM		 1337static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1338 struct nfs_pgio_header *hdr)
d67ae825 1339{
37e9ed22
TM		 1340 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1341 return;
0b7baf94 1342 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1343 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1344 hdr->args.count,
1345 task->tk_start);
37e9ed22
TM		 1346}
1347
1348static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1349 struct nfs_pgio_header *hdr)
1350{
1351 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1352 return;
1353 nfs4_ff_layout_stat_io_end_read(task,
1354 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1355 hdr->args.count,
1356 hdr->res.count);
1357}
abcb7bfc 1358
37e9ed22
TM		 1359static int ff_layout_read_prepare_common(struct rpc_task *task,
1360 struct nfs_pgio_header *hdr)
1361{
d67ae825
TH		 1362 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1363 rpc_exit(task, -EIO);
1364 return -EIO;
1365 }
75bf47eb
TM		 1366 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1367 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1368 return -EAGAIN;
1369 }
d67ae825 1370
37e9ed22 1371 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1372 return 0;
1373}
1374
1375/*
1376 * Call ops for the async read/write cases
1377 * In the case of dense layouts, the offset needs to be reset to its
1378 * original value.
1379 */
1380static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1381{
1382 struct nfs_pgio_header *hdr = data;
1383
1384 if (ff_layout_read_prepare_common(task, hdr))
1385 return;
1386
1387 rpc_call_start(task);
1388}
1389
d67ae825
TH		 1390static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1391{
1392 struct nfs_pgio_header *hdr = data;
1393
6de7e12f
AS		 1394 if (nfs4_setup_sequence(hdr->ds_clp,
1395 &hdr->args.seq_args,
1396 &hdr->res.seq_res,
1397 task))
d67ae825
TH		 1398 return;
1399
abcb7bfc
TM		 1400 if (ff_layout_read_prepare_common(task, hdr))
1401 return;
1402
d67ae825
TH		 1403 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1404 hdr->args.lock_context, FMODE_READ) == -EIO)
1405 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1406}
1407
1408static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1409{
1410 struct nfs_pgio_header *hdr = data;
1411
1412 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1413
1414 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1415 task->tk_status == 0) {
1416 nfs4_sequence_done(task, &hdr->res.seq_res);
1417 return;
1418 }
1419
1420 /* Note this may cause RPC to be resent */
1421 hdr->mds_ops->rpc_call_done(task, hdr);
1422}
1423
1424static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1425{
1426 struct nfs_pgio_header *hdr = data;
1427
37e9ed22 1428 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1429 rpc_count_iostats_metrics(task,
1430 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1431}
1432
4d0ac221
TM		 1433static void ff_layout_read_release(void *data)
1434{
1435 struct nfs_pgio_header *hdr = data;
1436
1437 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1438 pnfs_generic_rw_release(data);
1439}
1440
1441
d67ae825
TH		 1442static int ff_layout_write_done_cb(struct rpc_task *task,
1443 struct nfs_pgio_header *hdr)
1444{
2e18d4d8 1445 loff_t end_offs = 0;
d67ae825
TH		 1446 int err;
1447
1448 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1449 if (task->tk_status < 0)
d67ae825
TH		 1450 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1451 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1452 hdr->res.op_status, OP_WRITE,
1453 task->tk_status);
d67ae825
TH		 1454 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1455 hdr->ds_clp, hdr->lseg,
1456 hdr->pgio_mirror_idx);
1457
1458 switch (err) {
1459 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1460 ff_layout_reset_write(hdr, true);
1461 return task->tk_status;
d67ae825 1462 case -NFS4ERR_RESET_TO_MDS:
7cc8c5cd 1463 ff_layout_reset_write(hdr, false);
d67ae825
TH		 1464 return task->tk_status;
1465 case -EAGAIN:
d67ae825
TH		 1466 return -EAGAIN;
1467 }
1468
1469 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1470 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1471 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1472
1473 /* Note: if the write is unstable, don't set end_offs until commit */
1474 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1475
54204010
PT		 1476 /* zero out fattr since we don't care DS attr at all */
1477 hdr->fattr.valid = 0;
69f230d9
PT		 1478 if (task->tk_status >= 0)
1479 nfs_writeback_update_inode(hdr);
1480
d67ae825
TH		 1481 return 0;
1482}
1483
1484static int ff_layout_commit_done_cb(struct rpc_task *task,
1485 struct nfs_commit_data *data)
1486{
d67ae825
TH		 1487 int err;
1488
1489 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
dd52128a 1490 if (task->tk_status < 0)
d67ae825
TH		 1491 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1492 data->args.offset, data->args.count,
dd52128a
TM		 1493 data->res.op_status, OP_COMMIT,
1494 task->tk_status);
d67ae825
TH		 1495 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1496 data->lseg, data->ds_commit_index);
1497
1498 switch (err) {
1499 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1500 pnfs_generic_prepare_to_resend_writes(data);
1501 return -EAGAIN;
d67ae825 1502 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1503 pnfs_generic_prepare_to_resend_writes(data);
1504 return -EAGAIN;
1505 case -EAGAIN:
1506 rpc_restart_call_prepare(task);
1507 return -EAGAIN;
1508 }
1509
bc28e1c2 1510 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1511
1512 return 0;
1513}
1514
37e9ed22
TM		 1515static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1516 struct nfs_pgio_header *hdr)
d67ae825 1517{
37e9ed22
TM		 1518 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1519 return;
0b7baf94 1520 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1521 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1522 hdr->args.count,
1523 task->tk_start);
37e9ed22
TM		 1524}
1525
1526static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1527 struct nfs_pgio_header *hdr)
1528{
1529 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1530 return;
1531 nfs4_ff_layout_stat_io_end_write(task,
1532 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1533 hdr->args.count, hdr->res.count,
1534 hdr->res.verf->committed);
1535}
abcb7bfc 1536
37e9ed22
TM		 1537static int ff_layout_write_prepare_common(struct rpc_task *task,
1538 struct nfs_pgio_header *hdr)
1539{
d67ae825
TH		 1540 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1541 rpc_exit(task, -EIO);
1542 return -EIO;
1543 }
1544
75bf47eb
TM		 1545 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1546 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1547 return -EAGAIN;
1548 }
1549
37e9ed22 1550 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1551 return 0;
1552}
1553
1554static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1555{
1556 struct nfs_pgio_header *hdr = data;
1557
1558 if (ff_layout_write_prepare_common(task, hdr))
1559 return;
1560
1561 rpc_call_start(task);
1562}
1563
1564static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1565{
1566 struct nfs_pgio_header *hdr = data;
1567
6de7e12f
AS		 1568 if (nfs4_setup_sequence(hdr->ds_clp,
1569 &hdr->args.seq_args,
1570 &hdr->res.seq_res,
1571 task))
d67ae825
TH		 1572 return;
1573
abcb7bfc
TM		 1574 if (ff_layout_write_prepare_common(task, hdr))
1575 return;
1576
d67ae825
TH		 1577 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1578 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1579 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1580}
1581
1582static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1583{
1584 struct nfs_pgio_header *hdr = data;
1585
1586 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1587 task->tk_status == 0) {
1588 nfs4_sequence_done(task, &hdr->res.seq_res);
1589 return;
1590 }
1591
1592 /* Note this may cause RPC to be resent */
1593 hdr->mds_ops->rpc_call_done(task, hdr);
1594}
1595
1596static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1597{
1598 struct nfs_pgio_header *hdr = data;
1599
37e9ed22 1600 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1601 rpc_count_iostats_metrics(task,
1602 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1603}
1604
4d0ac221
TM		 1605static void ff_layout_write_release(void *data)
1606{
1607 struct nfs_pgio_header *hdr = data;
1608
1609 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1610 pnfs_generic_rw_release(data);
1611}
1612
37e9ed22 1613static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1614 struct nfs_commit_data *cdata)
1615{
37e9ed22
TM		 1616 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1617 return;
0b7baf94 1618 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1619 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1620 0, task->tk_start);
abcb7bfc
TM		 1621}
1622
37e9ed22
TM		 1623static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1624 struct nfs_commit_data *cdata)
1625{
1626 struct nfs_page *req;
1627 __u64 count = 0;
1628
1629 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1630 return;
1631
1632 if (task->tk_status == 0) {
1633 list_for_each_entry(req, &cdata->pages, wb_list)
1634 count += req->wb_bytes;
1635 }
1636 nfs4_ff_layout_stat_io_end_write(task,
1637 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1638 count, count, NFS_FILE_SYNC);
1639}
1640
1641static void ff_layout_commit_prepare_common(struct rpc_task *task,
1642 struct nfs_commit_data *cdata)
1643{
1644 ff_layout_commit_record_layoutstats_start(task, cdata);
1645}
1646
d67ae825
TH		 1647static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1648{
abcb7bfc 1649 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1650 rpc_call_start(task);
1651}
1652
1653static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1654{
1655 struct nfs_commit_data *wdata = data;
1656
6de7e12f
AS		 1657 if (nfs4_setup_sequence(wdata->ds_clp,
1658 &wdata->args.seq_args,
1659 &wdata->res.seq_res,
1660 task))
abcb7bfc
TM		 1661 return;
1662 ff_layout_commit_prepare_common(task, data);
1663}
1664
1665static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1666{
1667 pnfs_generic_write_commit_done(task, data);
1668}
1669
1670static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1671{
1672 struct nfs_commit_data *cdata = data;
abcb7bfc 1673
37e9ed22 1674 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1675 rpc_count_iostats_metrics(task,
1676 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1677}
1678
4d0ac221
TM		 1679static void ff_layout_commit_release(void *data)
1680{
1681 struct nfs_commit_data *cdata = data;
1682
1683 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1684 pnfs_generic_commit_release(data);
1685}
1686
d67ae825
TH		 1687static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1688 .rpc_call_prepare = ff_layout_read_prepare_v3,
1689 .rpc_call_done = ff_layout_read_call_done,
1690 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1691 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1692};
1693
1694static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1695 .rpc_call_prepare = ff_layout_read_prepare_v4,
1696 .rpc_call_done = ff_layout_read_call_done,
1697 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1698 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1699};
1700
1701static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1702 .rpc_call_prepare = ff_layout_write_prepare_v3,
1703 .rpc_call_done = ff_layout_write_call_done,
1704 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1705 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1706};
1707
1708static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1709 .rpc_call_prepare = ff_layout_write_prepare_v4,
1710 .rpc_call_done = ff_layout_write_call_done,
1711 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1712 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1713};
1714
1715static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1716 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1717 .rpc_call_done = ff_layout_commit_done,
d67ae825 1718 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1719 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1720};
1721
1722static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1723 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1724 .rpc_call_done = ff_layout_commit_done,
d67ae825 1725 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1726 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1727};
1728
1729static enum pnfs_try_status
1730ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1731{
1732 struct pnfs_layout_segment *lseg = hdr->lseg;
1733 struct nfs4_pnfs_ds *ds;
1734 struct rpc_clnt *ds_clnt;
1735 struct rpc_cred *ds_cred;
1736 loff_t offset = hdr->args.offset;
1737 u32 idx = hdr->pgio_mirror_idx;
1738 int vers;
1739 struct nfs_fh *fh;
1740
5b5e0928 1741 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
d67ae825
TH		 1742 __func__, hdr->inode->i_ino,
1743 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1744
1745 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1746 if (!ds)
1747 goto out_failed;
1748
1749 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1750 hdr->inode);
1751 if (IS_ERR(ds_clnt))
1752 goto out_failed;
1753
1754 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1755 if (!ds_cred)
d67ae825
TH		 1756 goto out_failed;
1757
1758 vers = nfs4_ff_layout_ds_version(lseg, idx);
1759
1760 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1761 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1762
75bf47eb 1763 hdr->pgio_done_cb = ff_layout_read_done_cb;
d67ae825
TH		 1764 atomic_inc(&ds->ds_clp->cl_count);
1765 hdr->ds_clp = ds->ds_clp;
1766 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1767 if (fh)
1768 hdr->args.fh = fh;
d67ae825
TH		 1769 /*
1770 * Note that if we ever decide to split across DSes,
1771 * then we may need to handle dense-like offsets.
1772 */
1773 hdr->args.offset = offset;
1774 hdr->mds_offset = offset;
1775
1776 /* Perform an asynchronous read to ds */
1777 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1778 vers == 3 ? &ff_layout_read_call_ops_v3 :
1779 &ff_layout_read_call_ops_v4,
1780 0, RPC_TASK_SOFTCONN);
57f3f4c0 1781 put_rpccred(ds_cred);
d67ae825
TH		 1782 return PNFS_ATTEMPTED;
1783
1784out_failed:
3b13b4b3 1785 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1786 return PNFS_TRY_AGAIN;
1787 return PNFS_NOT_ATTEMPTED;
1788}
1789
1790/* Perform async writes. */
1791static enum pnfs_try_status
1792ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1793{
1794 struct pnfs_layout_segment *lseg = hdr->lseg;
1795 struct nfs4_pnfs_ds *ds;
1796 struct rpc_clnt *ds_clnt;
1797 struct rpc_cred *ds_cred;
1798 loff_t offset = hdr->args.offset;
1799 int vers;
1800 struct nfs_fh *fh;
1801 int idx = hdr->pgio_mirror_idx;
1802
1803 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1804 if (!ds)
37f8aa16 1805 goto out_failed;
d67ae825
TH		 1806
1807 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1808 hdr->inode);
1809 if (IS_ERR(ds_clnt))
37f8aa16 1810 goto out_failed;
d67ae825
TH		 1811
1812 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1813 if (!ds_cred)
37f8aa16 1814 goto out_failed;
d67ae825
TH		 1815
1816 vers = nfs4_ff_layout_ds_version(lseg, idx);
1817
5b5e0928 1818 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
d67ae825
TH		 1819 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1820 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1821 vers);
1822
1823 hdr->pgio_done_cb = ff_layout_write_done_cb;
1824 atomic_inc(&ds->ds_clp->cl_count);
1825 hdr->ds_clp = ds->ds_clp;
1826 hdr->ds_commit_idx = idx;
1827 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1828 if (fh)
1829 hdr->args.fh = fh;
1830
1831 /*
1832 * Note that if we ever decide to split across DSes,
1833 * then we may need to handle dense-like offsets.
1834 */
1835 hdr->args.offset = offset;
1836
1837 /* Perform an asynchronous write */
1838 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1839 vers == 3 ? &ff_layout_write_call_ops_v3 :
1840 &ff_layout_write_call_ops_v4,
1841 sync, RPC_TASK_SOFTCONN);
57f3f4c0 1842 put_rpccred(ds_cred);
d67ae825 1843 return PNFS_ATTEMPTED;
37f8aa16
TM		 1844
1845out_failed:
1846 if (ff_layout_avoid_mds_available_ds(lseg))
1847 return PNFS_TRY_AGAIN;
1848 return PNFS_NOT_ATTEMPTED;
d67ae825
TH		 1849}
1850
d67ae825
TH		 1851static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1852{
1853 return i;
1854}
1855
1856static struct nfs_fh *
1857select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1858{
1859 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1860
1861 /* FIXME: Assume that there is only one NFS version available
1862 * for the DS.
1863 */
1864 return &flseg->mirror_array[i]->fh_versions[0];
1865}
1866
1867static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1868{
1869 struct pnfs_layout_segment *lseg = data->lseg;
1870 struct nfs4_pnfs_ds *ds;
1871 struct rpc_clnt *ds_clnt;
1872 struct rpc_cred *ds_cred;
1873 u32 idx;
57f3f4c0 1874 int vers, ret;
d67ae825
TH		 1875 struct nfs_fh *fh;
1876
1877 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1878 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1879 if (!ds)
1880 goto out_err;
1881
1882 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1883 data->inode);
1884 if (IS_ERR(ds_clnt))
1885 goto out_err;
1886
1887 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
57f3f4c0 1888 if (!ds_cred)
d67ae825
TH		 1889 goto out_err;
1890
1891 vers = nfs4_ff_layout_ds_version(lseg, idx);
1892
1893 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1894 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1895 vers);
1896 data->commit_done_cb = ff_layout_commit_done_cb;
1897 data->cred = ds_cred;
1898 atomic_inc(&ds->ds_clp->cl_count);
1899 data->ds_clp = ds->ds_clp;
1900 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1901 if (fh)
1902 data->args.fh = fh;
abcb7bfc 1903
57f3f4c0 1904 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1905 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1906 &ff_layout_commit_call_ops_v4,
1907 how, RPC_TASK_SOFTCONN);
57f3f4c0
JL		 1908 put_rpccred(ds_cred);
1909 return ret;
d67ae825
TH		 1910out_err:
1911 pnfs_generic_prepare_to_resend_writes(data);
1912 pnfs_generic_commit_release(data);
1913 return -EAGAIN;
1914}
1915
1916static int
1917ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1918 int how, struct nfs_commit_info *cinfo)
1919{
1920 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1921 ff_layout_initiate_commit);
1922}
1923
1924static struct pnfs_ds_commit_info *
1925ff_layout_get_ds_info(struct inode *inode)
1926{
1927 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1928
1929 if (layout == NULL)
1930 return NULL;
1931
1932 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1933}
1934
1935static void
fc87701b 1936ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1937{
1938 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1939 id_node));
1940}
1941
5ba6a09e 1942static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
5b9b3c85
TM		 1943 const struct nfs4_layoutreturn_args *args,
1944 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1945{
d67ae825 1946 __be32 *start;
d67ae825
TH		 1947
1948 start = xdr_reserve_space(xdr, 4);
1949 if (unlikely(!start))
1950 return -E2BIG;
1951
5b9b3c85 1952 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 1953 /* This assume we always return _ALL_ layouts */
5b9b3c85 1954 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 1955}
1956
230bc962
TM		 1957static void
1958encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1959{
ab6e9aaf 1960 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
230bc962
TM		 1961}
1962
1963static void
1964ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1965 const nfs4_stateid *stateid,
1966 const struct nfs42_layoutstat_devinfo *devinfo)
1967{
1968 __be32 *p;
1969
1970 p = xdr_reserve_space(xdr, 8 + 8);
1971 p = xdr_encode_hyper(p, devinfo->offset);
1972 p = xdr_encode_hyper(p, devinfo->length);
1973 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1974 p = xdr_reserve_space(xdr, 4*8);
1975 p = xdr_encode_hyper(p, devinfo->read_count);
1976 p = xdr_encode_hyper(p, devinfo->read_bytes);
1977 p = xdr_encode_hyper(p, devinfo->write_count);
1978 p = xdr_encode_hyper(p, devinfo->write_bytes);
1979 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1980}
1981
1982static void
1983ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1984 const nfs4_stateid *stateid,
1985 const struct nfs42_layoutstat_devinfo *devinfo)
1986{
1987 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1988 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1989 devinfo->ld_private.data);
1990}
1991
d67ae825 1992/* report nothing for now */
230bc962
TM		 1993static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
1994 const struct nfs4_layoutreturn_args *args,
1995 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 1996{
1997 __be32 *p;
230bc962 1998 int i;
d67ae825
TH		 1999
2000 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 2001 *p = cpu_to_be32(ff_args->num_dev);
2002 for (i = 0; i < ff_args->num_dev; i++)
2003 ff_layout_encode_ff_iostat(xdr,
2004 &args->layout->plh_stateid,
2005 &ff_args->devinfo[i]);
2006}
2007
2008static void
2009ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2010 unsigned int num_entries)
2011{
2012 unsigned int i;
2013
2014 for (i = 0; i < num_entries; i++) {
2015 if (!devinfo[i].ld_private.ops)
2016 continue;
2017 if (!devinfo[i].ld_private.ops->free)
2018 continue;
2019 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2020 }
d67ae825
TH		 2021}
2022
2023static struct nfs4_deviceid_node *
2024ff_layout_alloc_deviceid_node(struct nfs_server *server,
2025 struct pnfs_device *pdev, gfp_t gfp_flags)
2026{
2027 struct nfs4_ff_layout_ds *dsaddr;
2028
2029 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2030 if (!dsaddr)
2031 return NULL;
2032 return &dsaddr->id_node;
2033}
2034
2035static void
94e5c571 2036ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2037 const void *voidargs,
2038 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2039{
5b9b3c85 2040 const struct nfs4_layoutreturn_args *args = voidargs;
5ba6a09e 2041 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
d9152114
TM		 2042 struct xdr_buf tmp_buf = {
2043 .head = {
2044 [0] = {
2045 .iov_base = page_address(ff_args->pages[0]),
2046 },
2047 },
2048 .buflen = PAGE_SIZE,
2049 };
2050 struct xdr_stream tmp_xdr;
d67ae825
TH		 2051 __be32 *start;
2052
2053 dprintk("%s: Begin\n", __func__);
d67ae825 2054
d9152114
TM		 2055 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2056
2057 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2058 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2059
2060 start = xdr_reserve_space(xdr, 4);
2061 *start = cpu_to_be32(tmp_buf.len);
2062 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
082fa37d 2063
d67ae825
TH		 2064 dprintk("%s: Return\n", __func__);
2065}
2066
5b9b3c85
TM		 2067static void
2068ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2069{
2070 struct nfs4_flexfile_layoutreturn_args *ff_args;
2071
2072 if (!args->data)
2073 return;
2074 ff_args = args->data;
2075 args->data = NULL;
2076
2077 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2078 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85 2079
d9152114 2080 put_page(ff_args->pages[0]);
5b9b3c85
TM		 2081 kfree(ff_args);
2082}
2083
2e54b9b1 2084static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
5b9b3c85
TM		 2085 .encode = ff_layout_encode_layoutreturn,
2086 .free = ff_layout_free_layoutreturn,
2087};
2088
2089static int
2090ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2091{
2092 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2093 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85
TM		 2094
2095 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2096 if (!ff_args)
d9152114
TM		 2097 goto out_nomem;
2098 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2099 if (!ff_args->pages[0])
2100 goto out_nomem_free;
5b9b3c85
TM		 2101
2102 INIT_LIST_HEAD(&ff_args->errors);
2103 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2104 &args->range, &ff_args->errors,
2105 FF_LAYOUTRETURN_MAXERR);
2106
230bc962
TM		 2107 spin_lock(&args->inode->i_lock);
2108 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2109 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2110 spin_unlock(&args->inode->i_lock);
2111
5b9b3c85
TM		 2112 args->ld_private->ops = &layoutreturn_ops;
2113 args->ld_private->data = ff_args;
2114 return 0;
d9152114
TM		 2115out_nomem_free:
2116 kfree(ff_args);
2117out_nomem:
2118 return -ENOMEM;
5b9b3c85
TM		 2119}
2120
27c43064
PT		 2121static int
2122ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2123{
2124 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2125
2126 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2127}
2128
2129static size_t
2130ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2131 const int buflen)
2132{
2133 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2134 const struct in6_addr *addr = &sin6->sin6_addr;
2135
2136 /*
2137 * RFC 4291, Section 2.2.2
2138 *
2139 * Shorthanded ANY address
2140 */
2141 if (ipv6_addr_any(addr))
2142 return snprintf(buf, buflen, "::");
2143
2144 /*
2145 * RFC 4291, Section 2.2.2
2146 *
2147 * Shorthanded loopback address
2148 */
2149 if (ipv6_addr_loopback(addr))
2150 return snprintf(buf, buflen, "::1");
2151
2152 /*
2153 * RFC 4291, Section 2.2.3
2154 *
2155 * Special presentation address format for mapped v4
2156 * addresses.
2157 */
2158 if (ipv6_addr_v4mapped(addr))
2159 return snprintf(buf, buflen, "::ffff:%pI4",
2160 &addr->s6_addr32[3]);
2161
2162 /*
2163 * RFC 4291, Section 2.2.1
2164 */
2165 return snprintf(buf, buflen, "%pI6c", addr);
2166}
2167
2168/* Derived from rpc_sockaddr2uaddr */
2169static void
2170ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2171{
2172 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2173 char portbuf[RPCBIND_MAXUADDRPLEN];
2174 char addrbuf[RPCBIND_MAXUADDRLEN];
2175 char *netid;
2176 unsigned short port;
2177 int len, netid_len;
2178 __be32 *p;
2179
2180 switch (sap->sa_family) {
2181 case AF_INET:
2182 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2183 return;
2184 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2185 netid = "tcp";
2186 netid_len = 3;
2187 break;
2188 case AF_INET6:
2189 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2190 return;
2191 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2192 netid = "tcp6";
2193 netid_len = 4;
2194 break;
2195 default:
2196 /* we only support tcp and tcp6 */
2197 WARN_ON_ONCE(1);
2198 return;
2199 }
2200
2201 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2202 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2203
2204 p = xdr_reserve_space(xdr, 4 + netid_len);
2205 xdr_encode_opaque(p, netid, netid_len);
2206
2207 p = xdr_reserve_space(xdr, 4 + len);
2208 xdr_encode_opaque(p, addrbuf, len);
2209}
2210
2211static void
2212ff_layout_encode_nfstime(struct xdr_stream *xdr,
2213 ktime_t t)
2214{
2215 struct timespec64 ts;
2216 __be32 *p;
2217
2218 p = xdr_reserve_space(xdr, 12);
2219 ts = ktime_to_timespec64(t);
2220 p = xdr_encode_hyper(p, ts.tv_sec);
2221 *p++ = cpu_to_be32(ts.tv_nsec);
2222}
2223
2224static void
2225ff_layout_encode_io_latency(struct xdr_stream *xdr,
2226 struct nfs4_ff_io_stat *stat)
2227{
2228 __be32 *p;
2229
2230 p = xdr_reserve_space(xdr, 5 * 8);
2231 p = xdr_encode_hyper(p, stat->ops_requested);
2232 p = xdr_encode_hyper(p, stat->bytes_requested);
2233 p = xdr_encode_hyper(p, stat->ops_completed);
2234 p = xdr_encode_hyper(p, stat->bytes_completed);
2235 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2236 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2237 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2238}
2239
2240static void
422c93c8
TM		 2241ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2242 const struct nfs42_layoutstat_devinfo *devinfo,
2243 struct nfs4_ff_layout_mirror *mirror)
27c43064 2244{
27c43064
PT		 2245 struct nfs4_pnfs_ds_addr *da;
2246 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2247 struct nfs_fh *fh = &mirror->fh_versions[0];
422c93c8 2248 __be32 *p;
27c43064
PT		 2249
2250 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2251 dprintk("%s: DS %s: encoding address %s\n",
2252 __func__, ds->ds_remotestr, da->da_remotestr);
27c43064
PT		 2253 /* netaddr4 */
2254 ff_layout_encode_netaddr(xdr, da);
2255 /* nfs_fh4 */
2256 p = xdr_reserve_space(xdr, 4 + fh->size);
2257 xdr_encode_opaque(p, fh->data, fh->size);
2258 /* ff_io_latency4 read */
2259 spin_lock(&mirror->lock);
2260 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2261 /* ff_io_latency4 write */
2262 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2263 spin_unlock(&mirror->lock);
2264 /* nfstime4 */
2265 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2266 /* bool */
2267 p = xdr_reserve_space(xdr, 4);
2268 *p = cpu_to_be32(false);
422c93c8
TM		 2269}
2270
2271static void
2272ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2273 const struct nfs4_xdr_opaque_data *opaque)
2274{
2275 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2276 struct nfs42_layoutstat_devinfo, ld_private);
2277 __be32 *start;
2278
2279 /* layoutupdate length */
2280 start = xdr_reserve_space(xdr, 4);
2281 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
27c43064
PT		 2282
2283 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2284}
2285
422c93c8
TM		 2286static void
2287ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2288{
2289 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2290
2291 ff_layout_put_mirror(mirror);
2292}
2293
2294static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2295 .encode = ff_layout_encode_layoutstats,
2296 .free = ff_layout_free_layoutstats,
2297};
2298
266d12d4 2299static int
08e2e5bc
TM		 2300ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2301 struct nfs42_layoutstat_devinfo *devinfo,
266d12d4 2302 int dev_limit)
ad4dc53e 2303{
266d12d4 2304 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2305 struct nfs4_ff_layout_mirror *mirror;
2306 struct nfs4_deviceid_node *dev;
266d12d4 2307 int i = 0;
ad4dc53e 2308
266d12d4
TM		 2309 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2310 if (i >= dev_limit)
ad4dc53e 2311 break;
65990d1a 2312 if (IS_ERR_OR_NULL(mirror->mirror_ds))
27c43064 2313 continue;
06946c6a
TM		 2314 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2315 continue;
266d12d4
TM		 2316 /* mirror refcount put in cleanup_layoutstats */
2317 if (!atomic_inc_not_zero(&mirror->ref))
2318 continue;
2319 dev = &mirror->mirror_ds->id_node;
ad4dc53e 2320 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2321 devinfo->offset = 0;
2322 devinfo->length = NFS4_MAX_UINT64;
2f8220c1 2323 spin_lock(&mirror->lock);
d099d7b8 2324 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2325 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2326 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e 2327 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2f8220c1 2328 spin_unlock(&mirror->lock);
ad4dc53e 2329 devinfo->layout_type = LAYOUT_FLEX_FILES;
422c93c8
TM		 2330 devinfo->ld_private.ops = &layoutstat_ops;
2331 devinfo->ld_private.data = mirror;
ad4dc53e 2332
08e2e5bc 2333 devinfo++;
266d12d4 2334 i++;
ad4dc53e 2335 }
266d12d4 2336 return i;
ad4dc53e
PT		 2337}
2338
2339static int
2340ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2341{
266d12d4 2342 struct nfs4_flexfile_layout *ff_layout;
08e2e5bc 2343 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
ad4dc53e 2344
ad4dc53e 2345 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
266d12d4 2346 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2347 if (!args->devinfo)
2348 return -ENOMEM;
2349
ad4dc53e 2350 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2351 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2352 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2353 &args->devinfo[0], dev_count);
ad4dc53e 2354 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2355 if (!args->num_dev) {
2356 kfree(args->devinfo);
2357 args->devinfo = NULL;
2358 return -ENOENT;
2359 }
ad4dc53e
PT		 2360
2361 return 0;
2362}
2363
76b2a303
TM		 2364static int
2365ff_layout_set_layoutdriver(struct nfs_server *server,
2366 const struct nfs_fh *dummy)
2367{
2368#if IS_ENABLED(CONFIG_NFS_V4_2)
2369 server->caps |= NFS_CAP_LAYOUTSTATS;
2370#endif
2371 return 0;
2372}
2373
d67ae825
TH		 2374static struct pnfs_layoutdriver_type flexfilelayout_type = {
2375 .id = LAYOUT_FLEX_FILES,
2376 .name = "LAYOUT_FLEX_FILES",
2377 .owner = THIS_MODULE,
76b2a303 2378 .set_layoutdriver = ff_layout_set_layoutdriver,
d67ae825
TH		 2379 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2380 .free_layout_hdr = ff_layout_free_layout_hdr,
2381 .alloc_lseg = ff_layout_alloc_lseg,
2382 .free_lseg = ff_layout_free_lseg,
0762ed2c 2383 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2384 .pg_read_ops = &ff_layout_pg_read_ops,
2385 .pg_write_ops = &ff_layout_pg_write_ops,
2386 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2387 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 2388 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 2389 .clear_request_commit = pnfs_generic_clear_request_commit,
2390 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2391 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2392 .commit_pagelist = ff_layout_commit_pagelist,
2393 .read_pagelist = ff_layout_read_pagelist,
2394 .write_pagelist = ff_layout_write_pagelist,
2395 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2396 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2397 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2398 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2399};
2400
2401static int __init nfs4flexfilelayout_init(void)
2402{
2403 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2404 __func__);
90a0be00
JL		 2405 if (!ff_zero_group) {
2406 ff_zero_group = groups_alloc(0);
2407 if (!ff_zero_group)
2408 return -ENOMEM;
2409 }
d67ae825
TH		 2410 return pnfs_register_layoutdriver(&flexfilelayout_type);
2411}
2412
2413static void __exit nfs4flexfilelayout_exit(void)
2414{
2415 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2416 __func__);
2417 pnfs_unregister_layoutdriver(&flexfilelayout_type);
90a0be00
JL		 2418 if (ff_zero_group) {
2419 put_group_info(ff_zero_group);
2420 ff_zero_group = NULL;
2421 }
d67ae825
TH		 2422}
2423
2424MODULE_ALIAS("nfs-layouttype4-4");
2425
2426MODULE_LICENSE("GPL");
2427MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2428
2429module_init(nfs4flexfilelayout_init);
2430module_exit(nfs4flexfilelayout_exit);
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