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pNFS/flexfiles: Remove a redundant parameter in ff_layout_encode_ioerr()
[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{
d983803d 622 static const ktime_t notime = {0};
bbf58bf3 623 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
1c8d477a 624 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
d983803d 625
e76d28dd 626 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
9bbd9bb4
PT		 627 if (ktime_equal(mirror->start_time, notime))
628 mirror->start_time = now;
d0379a5d
TM		 629 if (mirror->report_interval != 0)
630 report_interval = (s64)mirror->report_interval * 1000LL;
631 else if (layoutstats_timer != 0)
bbf58bf3 632 report_interval = (s64)layoutstats_timer * 1000LL;
1c8d477a 633 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
bbf58bf3 634 report_interval) {
1c8d477a 635 ffl->last_report_time = now;
97ba375b
PT		 636 return true;
637 }
638
639 return false;
abcb7bfc
TM		 640}
641
642static void
643nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
644 __u64 requested)
645{
646 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
647
648 iostat->ops_requested++;
649 iostat->bytes_requested += requested;
650}
651
652static void
653nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
654 __u64 requested,
655 __u64 completed,
e76d28dd
TM		 656 ktime_t time_completed,
657 ktime_t time_started)
abcb7bfc
TM		 658{
659 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 660 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 661 ktime_t timer;
662
663 iostat->ops_completed++;
664 iostat->bytes_completed += completed;
665 iostat->bytes_not_delivered += requested - completed;
666
e76d28dd 667 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 668 iostat->total_busy_time =
669 ktime_add(iostat->total_busy_time, timer);
670 iostat->aggregate_completion_time =
e76d28dd
TM		 671 ktime_add(iostat->aggregate_completion_time,
672 completion_time);
abcb7bfc
TM		 673}
674
675static void
0b7baf94
TM		 676nfs4_ff_layout_stat_io_start_read(struct inode *inode,
677 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 678 __u64 requested, ktime_t now)
abcb7bfc 679{
97ba375b
PT		 680 bool report;
681
abcb7bfc 682 spin_lock(&mirror->lock);
e76d28dd 683 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
abcb7bfc 684 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
06946c6a 685 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 686 spin_unlock(&mirror->lock);
97ba375b
PT		 687
688 if (report)
0b7baf94 689 pnfs_report_layoutstat(inode, GFP_KERNEL);
abcb7bfc
TM		 690}
691
692static void
693nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
694 struct nfs4_ff_layout_mirror *mirror,
695 __u64 requested,
696 __u64 completed)
697{
698 spin_lock(&mirror->lock);
699 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
700 requested, completed,
e76d28dd 701 ktime_get(), task->tk_start);
06946c6a 702 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 703 spin_unlock(&mirror->lock);
704}
705
706static void
0b7baf94
TM		 707nfs4_ff_layout_stat_io_start_write(struct inode *inode,
708 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 709 __u64 requested, ktime_t now)
abcb7bfc 710{
97ba375b
PT		 711 bool report;
712
abcb7bfc 713 spin_lock(&mirror->lock);
e76d28dd 714 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc 715 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
06946c6a 716 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 717 spin_unlock(&mirror->lock);
97ba375b
PT		 718
719 if (report)
0b7baf94 720 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 721}
722
723static void
724nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
725 struct nfs4_ff_layout_mirror *mirror,
726 __u64 requested,
727 __u64 completed,
728 enum nfs3_stable_how committed)
729{
730 if (committed == NFS_UNSTABLE)
731 requested = completed = 0;
732
733 spin_lock(&mirror->lock);
734 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 735 requested, completed, ktime_get(), task->tk_start);
06946c6a 736 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 737 spin_unlock(&mirror->lock);
738}
739
d67ae825
TH		 740static int
741ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
742 struct nfs_commit_info *cinfo,
743 gfp_t gfp_flags)
744{
745 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
746 struct pnfs_commit_bucket *buckets;
747 int size;
748
749 if (cinfo->ds->nbuckets != 0) {
750 /* This assumes there is only one RW lseg per file.
751 * To support multiple lseg per file, we need to
752 * change struct pnfs_commit_bucket to allow dynamic
753 * increasing nbuckets.
754 */
755 return 0;
756 }
757
758 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
759
760 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
761 gfp_flags);
762 if (!buckets)
763 return -ENOMEM;
764 else {
765 int i;
766
fe238e60 767 spin_lock(&cinfo->inode->i_lock);
d67ae825
TH		 768 if (cinfo->ds->nbuckets != 0)
769 kfree(buckets);
770 else {
771 cinfo->ds->buckets = buckets;
772 cinfo->ds->nbuckets = size;
773 for (i = 0; i < size; i++) {
774 INIT_LIST_HEAD(&buckets[i].written);
775 INIT_LIST_HEAD(&buckets[i].committing);
776 /* mark direct verifier as unset */
777 buckets[i].direct_verf.committed =
778 NFS_INVALID_STABLE_HOW;
779 }
780 }
fe238e60 781 spin_unlock(&cinfo->inode->i_lock);
d67ae825
TH		 782 return 0;
783 }
784}
785
786static struct nfs4_pnfs_ds *
13544412
TM		 787ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
788 int start_idx,
d67ae825
TH		 789 int *best_idx)
790{
13544412 791 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825 792 struct nfs4_pnfs_ds *ds;
3dc14735 793 bool fail_return = false;
d67ae825
TH		 794 int idx;
795
d67ae825 796 /* mirrors are sorted by efficiency */
13544412 797 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
3dc14735
TM		 798 if (idx+1 == fls->mirror_array_cnt)
799 fail_return = true;
800 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
d67ae825
TH		 801 if (ds) {
802 *best_idx = idx;
803 return ds;
804 }
805 }
806
807 return NULL;
808}
809
c7d73af2
TH		 810static void
811ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
812 struct nfs_page *req,
813 bool strict_iomode)
814{
815retry_strict:
816 pnfs_put_lseg(pgio->pg_lseg);
817 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
818 req->wb_context,
819 0,
820 NFS4_MAX_UINT64,
821 IOMODE_READ,
822 strict_iomode,
823 GFP_KERNEL);
824 if (IS_ERR(pgio->pg_lseg)) {
825 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
826 pgio->pg_lseg = NULL;
827 }
828
829 /* If we don't have checking, do get a IOMODE_RW
830 * segment, and the server wants to avoid READs
831 * there, then retry!
832 */
833 if (pgio->pg_lseg && !strict_iomode &&
834 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
835 strict_iomode = true;
836 goto retry_strict;
837 }
838}
839
d67ae825
TH		 840static void
841ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
842 struct nfs_page *req)
843{
844 struct nfs_pgio_mirror *pgm;
845 struct nfs4_ff_layout_mirror *mirror;
846 struct nfs4_pnfs_ds *ds;
847 int ds_idx;
848
3dc14735 849retry:
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:
d600ad1f 898 if (!pgio->pg_lseg) {
d67ae825
TH		 899 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
900 req->wb_context,
901 0,
902 NFS4_MAX_UINT64,
903 IOMODE_RW,
c7d73af2 904 false,
d67ae825 905 GFP_NOFS);
d600ad1f
PT		 906 if (IS_ERR(pgio->pg_lseg)) {
907 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
908 pgio->pg_lseg = NULL;
909 return;
910 }
911 }
d67ae825
TH		 912 /* If no lseg, fall back to write through mds */
913 if (pgio->pg_lseg == NULL)
914 goto out_mds;
915
916 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
917 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
918 if (status < 0)
919 goto out_mds;
920
921 /* Use a direct mapping of ds_idx to pgio mirror_idx */
922 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
923 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
924 goto out_mds;
925
926 for (i = 0; i < pgio->pg_mirror_count; i++) {
927 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
446ca219 928 if (!ds) {
3dc14735 929 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 930 goto out_mds;
3dc14735
TM		 931 pnfs_put_lseg(pgio->pg_lseg);
932 pgio->pg_lseg = NULL;
933 /* Sleep for 1 second before retrying */
934 ssleep(1);
935 goto retry;
446ca219 936 }
d67ae825
TH		 937 pgm = &pgio->pg_mirrors[i];
938 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
939 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
940 }
941
942 return;
943
944out_mds:
945 pnfs_put_lseg(pgio->pg_lseg);
946 pgio->pg_lseg = NULL;
947 nfs_pageio_reset_write_mds(pgio);
948}
949
950static unsigned int
951ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
952 struct nfs_page *req)
953{
d600ad1f 954 if (!pgio->pg_lseg) {
d67ae825
TH		 955 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
956 req->wb_context,
957 0,
958 NFS4_MAX_UINT64,
959 IOMODE_RW,
c7d73af2 960 false,
d67ae825 961 GFP_NOFS);
d600ad1f
PT		 962 if (IS_ERR(pgio->pg_lseg)) {
963 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
964 pgio->pg_lseg = NULL;
965 goto out;
966 }
967 }
d67ae825
TH		 968 if (pgio->pg_lseg)
969 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
970
971 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 972 nfs_pageio_reset_write_mds(pgio);
d600ad1f 973out:
d67ae825
TH		 974 return 1;
975}
976
977static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
978 .pg_init = ff_layout_pg_init_read,
979 .pg_test = pnfs_generic_pg_test,
980 .pg_doio = pnfs_generic_pg_readpages,
981 .pg_cleanup = pnfs_generic_pg_cleanup,
982};
983
984static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
985 .pg_init = ff_layout_pg_init_write,
986 .pg_test = pnfs_generic_pg_test,
987 .pg_doio = pnfs_generic_pg_writepages,
988 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
989 .pg_cleanup = pnfs_generic_pg_cleanup,
990};
991
992static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
993{
994 struct rpc_task *task = &hdr->task;
995
996 pnfs_layoutcommit_inode(hdr->inode, false);
997
998 if (retry_pnfs) {
999 dprintk("%s Reset task %5u for i/o through pNFS "
1000 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1001 hdr->task.tk_pid,
1002 hdr->inode->i_sb->s_id,
1003 (unsigned long long)NFS_FILEID(hdr->inode),
1004 hdr->args.count,
1005 (unsigned long long)hdr->args.offset);
1006
dc602dd7 1007 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1008 return;
1009 }
1010
1011 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1012 dprintk("%s Reset task %5u for i/o through MDS "
1013 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1014 hdr->task.tk_pid,
1015 hdr->inode->i_sb->s_id,
1016 (unsigned long long)NFS_FILEID(hdr->inode),
1017 hdr->args.count,
1018 (unsigned long long)hdr->args.offset);
1019
1020 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1021 }
1022}
1023
1024static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1025{
1026 struct rpc_task *task = &hdr->task;
1027
1028 pnfs_layoutcommit_inode(hdr->inode, false);
1029
1030 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1031 dprintk("%s Reset task %5u for i/o through MDS "
1032 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1033 hdr->task.tk_pid,
1034 hdr->inode->i_sb->s_id,
1035 (unsigned long long)NFS_FILEID(hdr->inode),
1036 hdr->args.count,
1037 (unsigned long long)hdr->args.offset);
1038
1039 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1040 }
1041}
1042
1043static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1044 struct nfs4_state *state,
1045 struct nfs_client *clp,
1046 struct pnfs_layout_segment *lseg,
1047 int idx)
1048{
1049 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1050 struct inode *inode = lo->plh_inode;
1051 struct nfs_server *mds_server = NFS_SERVER(inode);
1052
1053 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1054 struct nfs_client *mds_client = mds_server->nfs_client;
1055 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1056
1057 if (task->tk_status >= 0)
1058 return 0;
1059
1060 switch (task->tk_status) {
1061 /* MDS state errors */
1062 case -NFS4ERR_DELEG_REVOKED:
1063 case -NFS4ERR_ADMIN_REVOKED:
1064 case -NFS4ERR_BAD_STATEID:
1065 if (state == NULL)
1066 break;
41020b67 1067 nfs_remove_bad_delegation(state->inode, NULL);
d67ae825
TH		 1068 case -NFS4ERR_OPENMODE:
1069 if (state == NULL)
1070 break;
1071 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1072 goto out_bad_stateid;
1073 goto wait_on_recovery;
1074 case -NFS4ERR_EXPIRED:
1075 if (state != NULL) {
1076 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1077 goto out_bad_stateid;
1078 }
1079 nfs4_schedule_lease_recovery(mds_client);
1080 goto wait_on_recovery;
1081 /* DS session errors */
1082 case -NFS4ERR_BADSESSION:
1083 case -NFS4ERR_BADSLOT:
1084 case -NFS4ERR_BAD_HIGH_SLOT:
1085 case -NFS4ERR_DEADSESSION:
1086 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1087 case -NFS4ERR_SEQ_FALSE_RETRY:
1088 case -NFS4ERR_SEQ_MISORDERED:
1089 dprintk("%s ERROR %d, Reset session. Exchangeid "
1090 "flags 0x%x\n", __func__, task->tk_status,
1091 clp->cl_exchange_flags);
1092 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1093 break;
1094 case -NFS4ERR_DELAY:
1095 case -NFS4ERR_GRACE:
1096 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1097 break;
1098 case -NFS4ERR_RETRY_UNCACHED_REP:
1099 break;
1100 /* Invalidate Layout errors */
1101 case -NFS4ERR_PNFS_NO_LAYOUT:
1102 case -ESTALE: /* mapped NFS4ERR_STALE */
1103 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1104 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1105 case -NFS4ERR_FHEXPIRED:
1106 case -NFS4ERR_WRONG_TYPE:
1107 dprintk("%s Invalid layout error %d\n", __func__,
1108 task->tk_status);
1109 /*
1110 * Destroy layout so new i/o will get a new layout.
1111 * Layout will not be destroyed until all current lseg
1112 * references are put. Mark layout as invalid to resend failed
1113 * i/o and all i/o waiting on the slot table to the MDS until
1114 * layout is destroyed and a new valid layout is obtained.
1115 */
1116 pnfs_destroy_layout(NFS_I(inode));
1117 rpc_wake_up(&tbl->slot_tbl_waitq);
1118 goto reset;
1119 /* RPC connection errors */
1120 case -ECONNREFUSED:
1121 case -EHOSTDOWN:
1122 case -EHOSTUNREACH:
1123 case -ENETUNREACH:
1124 case -EIO:
1125 case -ETIMEDOUT:
1126 case -EPIPE:
1127 dprintk("%s DS connection error %d\n", __func__,
1128 task->tk_status);
1129 nfs4_mark_deviceid_unavailable(devid);
1130 rpc_wake_up(&tbl->slot_tbl_waitq);
1131 /* fall through */
1132 default:
3b13b4b3 1133 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1134 return -NFS4ERR_RESET_TO_PNFS;
1135reset:
1136 dprintk("%s Retry through MDS. Error %d\n", __func__,
1137 task->tk_status);
1138 return -NFS4ERR_RESET_TO_MDS;
1139 }
1140out:
1141 task->tk_status = 0;
1142 return -EAGAIN;
1143out_bad_stateid:
1144 task->tk_status = -EIO;
1145 return 0;
1146wait_on_recovery:
1147 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1148 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1149 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1150 goto out;
1151}
1152
1153/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1154static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1155 struct pnfs_layout_segment *lseg,
1156 int idx)
1157{
1158 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1159
1160 if (task->tk_status >= 0)
1161 return 0;
1162
90816d1d
TM		 1163 switch (task->tk_status) {
1164 /* File access problems. Don't mark the device as unavailable */
1165 case -EACCES:
1166 case -ESTALE:
1167 case -EISDIR:
1168 case -EBADHANDLE:
1169 case -ELOOP:
1170 case -ENOSPC:
1171 break;
1172 case -EJUKEBOX:
1173 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1174 goto out_retry;
1175 default:
d67ae825
TH		 1176 dprintk("%s DS connection error %d\n", __func__,
1177 task->tk_status);
1178 nfs4_mark_deviceid_unavailable(devid);
d67ae825 1179 }
90816d1d
TM		 1180 /* FIXME: Need to prevent infinite looping here. */
1181 return -NFS4ERR_RESET_TO_PNFS;
1182out_retry:
d67ae825 1183 task->tk_status = 0;
7eeea167 1184 rpc_restart_call_prepare(task);
d67ae825
TH		 1185 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1186 return -EAGAIN;
1187}
1188
1189static int ff_layout_async_handle_error(struct rpc_task *task,
1190 struct nfs4_state *state,
1191 struct nfs_client *clp,
1192 struct pnfs_layout_segment *lseg,
1193 int idx)
1194{
1195 int vers = clp->cl_nfs_mod->rpc_vers->number;
1196
1197 switch (vers) {
1198 case 3:
1199 return ff_layout_async_handle_error_v3(task, lseg, idx);
1200 case 4:
1201 return ff_layout_async_handle_error_v4(task, state, clp,
1202 lseg, idx);
1203 default:
1204 /* should never happen */
1205 WARN_ON_ONCE(1);
1206 return 0;
1207 }
1208}
1209
1210static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1211 int idx, u64 offset, u64 length,
dd52128a 1212 u32 status, int opnum, int error)
d67ae825
TH		 1213{
1214 struct nfs4_ff_layout_mirror *mirror;
1215 int err;
1216
dd52128a
TM		 1217 if (status == 0) {
1218 switch (error) {
1219 case -ETIMEDOUT:
1220 case -EPFNOSUPPORT:
1221 case -EPROTONOSUPPORT:
1222 case -EOPNOTSUPP:
1223 case -ECONNREFUSED:
1224 case -ECONNRESET:
1225 case -EHOSTDOWN:
1226 case -EHOSTUNREACH:
1227 case -ENETUNREACH:
1228 case -EADDRINUSE:
1229 case -ENOBUFS:
1230 case -EPIPE:
1231 case -EPERM:
1232 status = NFS4ERR_NXIO;
1233 break;
1234 case -EACCES:
1235 status = NFS4ERR_ACCESS;
1236 break;
1237 default:
1238 return;
1239 }
1240 }
1241
c22eeb86
PT		 1242 switch (status) {
1243 case NFS4ERR_DELAY:
1244 case NFS4ERR_GRACE:
1245 return;
1246 default:
1247 break;
1248 }
1249
d67ae825
TH		 1250 mirror = FF_LAYOUT_COMP(lseg, idx);
1251 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1252 mirror, offset, length, status, opnum,
1253 GFP_NOIO);
f95c03b2 1254 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
d67ae825
TH		 1255 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1256}
1257
1258/* NFS_PROTO call done callback routines */
d67ae825
TH		 1259static int ff_layout_read_done_cb(struct rpc_task *task,
1260 struct nfs_pgio_header *hdr)
1261{
d67ae825
TH		 1262 int err;
1263
1264 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1265 if (task->tk_status < 0)
d67ae825
TH		 1266 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1267 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1268 hdr->res.op_status, OP_READ,
1269 task->tk_status);
d67ae825
TH		 1270 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1271 hdr->ds_clp, hdr->lseg,
1272 hdr->pgio_mirror_idx);
1273
1274 switch (err) {
1275 case -NFS4ERR_RESET_TO_PNFS:
13544412
TM		 1276 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1277 hdr->pgio_mirror_idx + 1,
1278 &hdr->pgio_mirror_idx))
1279 goto out_eagain;
54e4a0df 1280 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1281 pnfs_read_resend_pnfs(hdr);
1282 return task->tk_status;
1283 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1284 ff_layout_reset_read(hdr);
1285 return task->tk_status;
1286 case -EAGAIN:
13544412 1287 goto out_eagain;
d67ae825
TH		 1288 }
1289
1290 return 0;
13544412
TM		 1291out_eagain:
1292 rpc_restart_call_prepare(task);
1293 return -EAGAIN;
d67ae825
TH		 1294}
1295
c0f5f505
TM		 1296static bool
1297ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1298{
1299 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1300}
1301
d67ae825
TH		 1302/*
1303 * We reference the rpc_cred of the first WRITE that triggers the need for
1304 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1305 * rfc5661 is not clear about which credential should be used.
1306 *
1307 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1308 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1309 * we always send layoutcommit after DS writes.
1310 */
1311static void
bc28e1c2
TM		 1312ff_layout_set_layoutcommit(struct inode *inode,
1313 struct pnfs_layout_segment *lseg,
1314 loff_t end_offset)
d67ae825 1315{
bc28e1c2 1316 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1317 return;
1318
bc28e1c2
TM		 1319 pnfs_set_layoutcommit(inode, lseg, end_offset);
1320 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1321 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1322}
1323
1324static bool
75bf47eb 1325ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
d67ae825
TH		 1326{
1327 /* No mirroring for now */
1328 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1329
1330 return ff_layout_test_devid_unavailable(node);
1331}
1332
37e9ed22
TM		 1333static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1334 struct nfs_pgio_header *hdr)
d67ae825 1335{
37e9ed22
TM		 1336 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1337 return;
0b7baf94 1338 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1339 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1340 hdr->args.count,
1341 task->tk_start);
37e9ed22
TM		 1342}
1343
1344static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1345 struct nfs_pgio_header *hdr)
1346{
1347 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1348 return;
1349 nfs4_ff_layout_stat_io_end_read(task,
1350 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1351 hdr->args.count,
1352 hdr->res.count);
1353}
abcb7bfc 1354
37e9ed22
TM		 1355static int ff_layout_read_prepare_common(struct rpc_task *task,
1356 struct nfs_pgio_header *hdr)
1357{
d67ae825
TH		 1358 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1359 rpc_exit(task, -EIO);
1360 return -EIO;
1361 }
75bf47eb
TM		 1362 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1363 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1364 return -EAGAIN;
1365 }
d67ae825 1366
37e9ed22 1367 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1368 return 0;
1369}
1370
1371/*
1372 * Call ops for the async read/write cases
1373 * In the case of dense layouts, the offset needs to be reset to its
1374 * original value.
1375 */
1376static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1377{
1378 struct nfs_pgio_header *hdr = data;
1379
1380 if (ff_layout_read_prepare_common(task, hdr))
1381 return;
1382
1383 rpc_call_start(task);
1384}
1385
1386static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1387 struct nfs4_sequence_args *args,
1388 struct nfs4_sequence_res *res,
1389 struct rpc_task *task)
1390{
1391 if (ds_clp->cl_session)
1392 return nfs41_setup_sequence(ds_clp->cl_session,
1393 args,
1394 res,
1395 task);
1396 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1397 args,
1398 res,
1399 task);
1400}
1401
1402static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1403{
1404 struct nfs_pgio_header *hdr = data;
1405
d67ae825
TH		 1406 if (ff_layout_setup_sequence(hdr->ds_clp,
1407 &hdr->args.seq_args,
1408 &hdr->res.seq_res,
1409 task))
1410 return;
1411
abcb7bfc
TM		 1412 if (ff_layout_read_prepare_common(task, hdr))
1413 return;
1414
d67ae825
TH		 1415 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1416 hdr->args.lock_context, FMODE_READ) == -EIO)
1417 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1418}
1419
1420static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1421{
1422 struct nfs_pgio_header *hdr = data;
1423
1424 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1425
1426 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1427 task->tk_status == 0) {
1428 nfs4_sequence_done(task, &hdr->res.seq_res);
1429 return;
1430 }
1431
1432 /* Note this may cause RPC to be resent */
1433 hdr->mds_ops->rpc_call_done(task, hdr);
1434}
1435
1436static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1437{
1438 struct nfs_pgio_header *hdr = data;
1439
37e9ed22 1440 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1441 rpc_count_iostats_metrics(task,
1442 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1443}
1444
4d0ac221
TM		 1445static void ff_layout_read_release(void *data)
1446{
1447 struct nfs_pgio_header *hdr = data;
1448
1449 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1450 pnfs_generic_rw_release(data);
1451}
1452
1453
d67ae825
TH		 1454static int ff_layout_write_done_cb(struct rpc_task *task,
1455 struct nfs_pgio_header *hdr)
1456{
2e18d4d8 1457 loff_t end_offs = 0;
d67ae825
TH		 1458 int err;
1459
1460 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1461 if (task->tk_status < 0)
d67ae825
TH		 1462 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1463 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1464 hdr->res.op_status, OP_WRITE,
1465 task->tk_status);
d67ae825
TH		 1466 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1467 hdr->ds_clp, hdr->lseg,
1468 hdr->pgio_mirror_idx);
1469
1470 switch (err) {
1471 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1472 ff_layout_reset_write(hdr, true);
1473 return task->tk_status;
d67ae825 1474 case -NFS4ERR_RESET_TO_MDS:
7cc8c5cd 1475 ff_layout_reset_write(hdr, false);
d67ae825
TH		 1476 return task->tk_status;
1477 case -EAGAIN:
d67ae825
TH		 1478 return -EAGAIN;
1479 }
1480
1481 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1482 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1483 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1484
1485 /* Note: if the write is unstable, don't set end_offs until commit */
1486 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1487
54204010
PT		 1488 /* zero out fattr since we don't care DS attr at all */
1489 hdr->fattr.valid = 0;
69f230d9
PT		 1490 if (task->tk_status >= 0)
1491 nfs_writeback_update_inode(hdr);
1492
d67ae825
TH		 1493 return 0;
1494}
1495
1496static int ff_layout_commit_done_cb(struct rpc_task *task,
1497 struct nfs_commit_data *data)
1498{
d67ae825
TH		 1499 int err;
1500
1501 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
dd52128a 1502 if (task->tk_status < 0)
d67ae825
TH		 1503 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1504 data->args.offset, data->args.count,
dd52128a
TM		 1505 data->res.op_status, OP_COMMIT,
1506 task->tk_status);
d67ae825
TH		 1507 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1508 data->lseg, data->ds_commit_index);
1509
1510 switch (err) {
1511 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1512 pnfs_generic_prepare_to_resend_writes(data);
1513 return -EAGAIN;
d67ae825 1514 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1515 pnfs_generic_prepare_to_resend_writes(data);
1516 return -EAGAIN;
1517 case -EAGAIN:
1518 rpc_restart_call_prepare(task);
1519 return -EAGAIN;
1520 }
1521
bc28e1c2 1522 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1523
1524 return 0;
1525}
1526
37e9ed22
TM		 1527static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1528 struct nfs_pgio_header *hdr)
d67ae825 1529{
37e9ed22
TM		 1530 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1531 return;
0b7baf94 1532 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1533 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1534 hdr->args.count,
1535 task->tk_start);
37e9ed22
TM		 1536}
1537
1538static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1539 struct nfs_pgio_header *hdr)
1540{
1541 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1542 return;
1543 nfs4_ff_layout_stat_io_end_write(task,
1544 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1545 hdr->args.count, hdr->res.count,
1546 hdr->res.verf->committed);
1547}
abcb7bfc 1548
37e9ed22
TM		 1549static int ff_layout_write_prepare_common(struct rpc_task *task,
1550 struct nfs_pgio_header *hdr)
1551{
d67ae825
TH		 1552 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1553 rpc_exit(task, -EIO);
1554 return -EIO;
1555 }
1556
75bf47eb
TM		 1557 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1558 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1559 return -EAGAIN;
1560 }
1561
37e9ed22 1562 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1563 return 0;
1564}
1565
1566static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1567{
1568 struct nfs_pgio_header *hdr = data;
1569
1570 if (ff_layout_write_prepare_common(task, hdr))
1571 return;
1572
1573 rpc_call_start(task);
1574}
1575
1576static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1577{
1578 struct nfs_pgio_header *hdr = data;
1579
d67ae825
TH		 1580 if (ff_layout_setup_sequence(hdr->ds_clp,
1581 &hdr->args.seq_args,
1582 &hdr->res.seq_res,
1583 task))
1584 return;
1585
abcb7bfc
TM		 1586 if (ff_layout_write_prepare_common(task, hdr))
1587 return;
1588
d67ae825
TH		 1589 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1590 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1591 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1592}
1593
1594static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1595{
1596 struct nfs_pgio_header *hdr = data;
1597
1598 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1599 task->tk_status == 0) {
1600 nfs4_sequence_done(task, &hdr->res.seq_res);
1601 return;
1602 }
1603
1604 /* Note this may cause RPC to be resent */
1605 hdr->mds_ops->rpc_call_done(task, hdr);
1606}
1607
1608static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1609{
1610 struct nfs_pgio_header *hdr = data;
1611
37e9ed22 1612 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1613 rpc_count_iostats_metrics(task,
1614 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1615}
1616
4d0ac221
TM		 1617static void ff_layout_write_release(void *data)
1618{
1619 struct nfs_pgio_header *hdr = data;
1620
1621 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1622 pnfs_generic_rw_release(data);
1623}
1624
37e9ed22 1625static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1626 struct nfs_commit_data *cdata)
1627{
37e9ed22
TM		 1628 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1629 return;
0b7baf94 1630 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1631 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1632 0, task->tk_start);
abcb7bfc
TM		 1633}
1634
37e9ed22
TM		 1635static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1636 struct nfs_commit_data *cdata)
1637{
1638 struct nfs_page *req;
1639 __u64 count = 0;
1640
1641 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1642 return;
1643
1644 if (task->tk_status == 0) {
1645 list_for_each_entry(req, &cdata->pages, wb_list)
1646 count += req->wb_bytes;
1647 }
1648 nfs4_ff_layout_stat_io_end_write(task,
1649 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1650 count, count, NFS_FILE_SYNC);
1651}
1652
1653static void ff_layout_commit_prepare_common(struct rpc_task *task,
1654 struct nfs_commit_data *cdata)
1655{
1656 ff_layout_commit_record_layoutstats_start(task, cdata);
1657}
1658
d67ae825
TH		 1659static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1660{
abcb7bfc 1661 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1662 rpc_call_start(task);
1663}
1664
1665static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1666{
1667 struct nfs_commit_data *wdata = data;
1668
abcb7bfc 1669 if (ff_layout_setup_sequence(wdata->ds_clp,
d67ae825
TH		 1670 &wdata->args.seq_args,
1671 &wdata->res.seq_res,
abcb7bfc
TM		 1672 task))
1673 return;
1674 ff_layout_commit_prepare_common(task, data);
1675}
1676
1677static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1678{
1679 pnfs_generic_write_commit_done(task, data);
1680}
1681
1682static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1683{
1684 struct nfs_commit_data *cdata = data;
abcb7bfc 1685
37e9ed22 1686 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1687 rpc_count_iostats_metrics(task,
1688 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1689}
1690
4d0ac221
TM		 1691static void ff_layout_commit_release(void *data)
1692{
1693 struct nfs_commit_data *cdata = data;
1694
1695 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1696 pnfs_generic_commit_release(data);
1697}
1698
d67ae825
TH		 1699static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1700 .rpc_call_prepare = ff_layout_read_prepare_v3,
1701 .rpc_call_done = ff_layout_read_call_done,
1702 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1703 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1704};
1705
1706static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1707 .rpc_call_prepare = ff_layout_read_prepare_v4,
1708 .rpc_call_done = ff_layout_read_call_done,
1709 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1710 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1711};
1712
1713static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1714 .rpc_call_prepare = ff_layout_write_prepare_v3,
1715 .rpc_call_done = ff_layout_write_call_done,
1716 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1717 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1718};
1719
1720static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1721 .rpc_call_prepare = ff_layout_write_prepare_v4,
1722 .rpc_call_done = ff_layout_write_call_done,
1723 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1724 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1725};
1726
1727static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1728 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1729 .rpc_call_done = ff_layout_commit_done,
d67ae825 1730 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1731 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1732};
1733
1734static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1735 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1736 .rpc_call_done = ff_layout_commit_done,
d67ae825 1737 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1738 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1739};
1740
1741static enum pnfs_try_status
1742ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1743{
1744 struct pnfs_layout_segment *lseg = hdr->lseg;
1745 struct nfs4_pnfs_ds *ds;
1746 struct rpc_clnt *ds_clnt;
1747 struct rpc_cred *ds_cred;
1748 loff_t offset = hdr->args.offset;
1749 u32 idx = hdr->pgio_mirror_idx;
1750 int vers;
1751 struct nfs_fh *fh;
1752
1753 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1754 __func__, hdr->inode->i_ino,
1755 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1756
1757 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1758 if (!ds)
1759 goto out_failed;
1760
1761 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1762 hdr->inode);
1763 if (IS_ERR(ds_clnt))
1764 goto out_failed;
1765
1766 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1767 if (!ds_cred)
d67ae825
TH		 1768 goto out_failed;
1769
1770 vers = nfs4_ff_layout_ds_version(lseg, idx);
1771
1772 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1773 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1774
75bf47eb 1775 hdr->pgio_done_cb = ff_layout_read_done_cb;
d67ae825
TH		 1776 atomic_inc(&ds->ds_clp->cl_count);
1777 hdr->ds_clp = ds->ds_clp;
1778 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1779 if (fh)
1780 hdr->args.fh = fh;
d67ae825
TH		 1781 /*
1782 * Note that if we ever decide to split across DSes,
1783 * then we may need to handle dense-like offsets.
1784 */
1785 hdr->args.offset = offset;
1786 hdr->mds_offset = offset;
1787
1788 /* Perform an asynchronous read to ds */
1789 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1790 vers == 3 ? &ff_layout_read_call_ops_v3 :
1791 &ff_layout_read_call_ops_v4,
1792 0, RPC_TASK_SOFTCONN);
57f3f4c0 1793 put_rpccred(ds_cred);
d67ae825
TH		 1794 return PNFS_ATTEMPTED;
1795
1796out_failed:
3b13b4b3 1797 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1798 return PNFS_TRY_AGAIN;
1799 return PNFS_NOT_ATTEMPTED;
1800}
1801
1802/* Perform async writes. */
1803static enum pnfs_try_status
1804ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1805{
1806 struct pnfs_layout_segment *lseg = hdr->lseg;
1807 struct nfs4_pnfs_ds *ds;
1808 struct rpc_clnt *ds_clnt;
1809 struct rpc_cred *ds_cred;
1810 loff_t offset = hdr->args.offset;
1811 int vers;
1812 struct nfs_fh *fh;
1813 int idx = hdr->pgio_mirror_idx;
1814
1815 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1816 if (!ds)
1817 return PNFS_NOT_ATTEMPTED;
1818
1819 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1820 hdr->inode);
1821 if (IS_ERR(ds_clnt))
1822 return PNFS_NOT_ATTEMPTED;
1823
1824 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1825 if (!ds_cred)
d67ae825
TH		 1826 return PNFS_NOT_ATTEMPTED;
1827
1828 vers = nfs4_ff_layout_ds_version(lseg, idx);
1829
1830 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1831 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1832 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1833 vers);
1834
1835 hdr->pgio_done_cb = ff_layout_write_done_cb;
1836 atomic_inc(&ds->ds_clp->cl_count);
1837 hdr->ds_clp = ds->ds_clp;
1838 hdr->ds_commit_idx = idx;
1839 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1840 if (fh)
1841 hdr->args.fh = fh;
1842
1843 /*
1844 * Note that if we ever decide to split across DSes,
1845 * then we may need to handle dense-like offsets.
1846 */
1847 hdr->args.offset = offset;
1848
1849 /* Perform an asynchronous write */
1850 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1851 vers == 3 ? &ff_layout_write_call_ops_v3 :
1852 &ff_layout_write_call_ops_v4,
1853 sync, RPC_TASK_SOFTCONN);
57f3f4c0 1854 put_rpccred(ds_cred);
d67ae825
TH		 1855 return PNFS_ATTEMPTED;
1856}
1857
d67ae825
TH		 1858static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1859{
1860 return i;
1861}
1862
1863static struct nfs_fh *
1864select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1865{
1866 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1867
1868 /* FIXME: Assume that there is only one NFS version available
1869 * for the DS.
1870 */
1871 return &flseg->mirror_array[i]->fh_versions[0];
1872}
1873
1874static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1875{
1876 struct pnfs_layout_segment *lseg = data->lseg;
1877 struct nfs4_pnfs_ds *ds;
1878 struct rpc_clnt *ds_clnt;
1879 struct rpc_cred *ds_cred;
1880 u32 idx;
57f3f4c0 1881 int vers, ret;
d67ae825
TH		 1882 struct nfs_fh *fh;
1883
1884 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1885 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1886 if (!ds)
1887 goto out_err;
1888
1889 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1890 data->inode);
1891 if (IS_ERR(ds_clnt))
1892 goto out_err;
1893
1894 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
57f3f4c0 1895 if (!ds_cred)
d67ae825
TH		 1896 goto out_err;
1897
1898 vers = nfs4_ff_layout_ds_version(lseg, idx);
1899
1900 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1901 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1902 vers);
1903 data->commit_done_cb = ff_layout_commit_done_cb;
1904 data->cred = ds_cred;
1905 atomic_inc(&ds->ds_clp->cl_count);
1906 data->ds_clp = ds->ds_clp;
1907 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1908 if (fh)
1909 data->args.fh = fh;
abcb7bfc 1910
57f3f4c0 1911 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1912 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1913 &ff_layout_commit_call_ops_v4,
1914 how, RPC_TASK_SOFTCONN);
57f3f4c0
JL		 1915 put_rpccred(ds_cred);
1916 return ret;
d67ae825
TH		 1917out_err:
1918 pnfs_generic_prepare_to_resend_writes(data);
1919 pnfs_generic_commit_release(data);
1920 return -EAGAIN;
1921}
1922
1923static int
1924ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1925 int how, struct nfs_commit_info *cinfo)
1926{
1927 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1928 ff_layout_initiate_commit);
1929}
1930
1931static struct pnfs_ds_commit_info *
1932ff_layout_get_ds_info(struct inode *inode)
1933{
1934 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1935
1936 if (layout == NULL)
1937 return NULL;
1938
1939 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1940}
1941
1942static void
fc87701b 1943ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1944{
1945 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1946 id_node));
1947}
1948
5ba6a09e 1949static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
5b9b3c85
TM		 1950 const struct nfs4_layoutreturn_args *args,
1951 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1952{
d67ae825 1953 __be32 *start;
d67ae825
TH		 1954
1955 start = xdr_reserve_space(xdr, 4);
1956 if (unlikely(!start))
1957 return -E2BIG;
1958
5b9b3c85 1959 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 1960 /* This assume we always return _ALL_ layouts */
5b9b3c85 1961 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 1962}
1963
230bc962
TM		 1964static void
1965encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1966{
1967 __be32 *p;
1968
1969 p = xdr_reserve_space(xdr, len);
1970 xdr_encode_opaque_fixed(p, buf, len);
1971}
1972
1973static void
1974ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1975 const nfs4_stateid *stateid,
1976 const struct nfs42_layoutstat_devinfo *devinfo)
1977{
1978 __be32 *p;
1979
1980 p = xdr_reserve_space(xdr, 8 + 8);
1981 p = xdr_encode_hyper(p, devinfo->offset);
1982 p = xdr_encode_hyper(p, devinfo->length);
1983 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1984 p = xdr_reserve_space(xdr, 4*8);
1985 p = xdr_encode_hyper(p, devinfo->read_count);
1986 p = xdr_encode_hyper(p, devinfo->read_bytes);
1987 p = xdr_encode_hyper(p, devinfo->write_count);
1988 p = xdr_encode_hyper(p, devinfo->write_bytes);
1989 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1990}
1991
1992static void
1993ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1994 const nfs4_stateid *stateid,
1995 const struct nfs42_layoutstat_devinfo *devinfo)
1996{
1997 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1998 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1999 devinfo->ld_private.data);
2000}
2001
d67ae825 2002/* report nothing for now */
230bc962
TM		 2003static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2004 const struct nfs4_layoutreturn_args *args,
2005 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 2006{
2007 __be32 *p;
230bc962 2008 int i;
d67ae825
TH		 2009
2010 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 2011 *p = cpu_to_be32(ff_args->num_dev);
2012 for (i = 0; i < ff_args->num_dev; i++)
2013 ff_layout_encode_ff_iostat(xdr,
2014 &args->layout->plh_stateid,
2015 &ff_args->devinfo[i]);
2016}
2017
2018static void
2019ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2020 unsigned int num_entries)
2021{
2022 unsigned int i;
2023
2024 for (i = 0; i < num_entries; i++) {
2025 if (!devinfo[i].ld_private.ops)
2026 continue;
2027 if (!devinfo[i].ld_private.ops->free)
2028 continue;
2029 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2030 }
d67ae825
TH		 2031}
2032
2033static struct nfs4_deviceid_node *
2034ff_layout_alloc_deviceid_node(struct nfs_server *server,
2035 struct pnfs_device *pdev, gfp_t gfp_flags)
2036{
2037 struct nfs4_ff_layout_ds *dsaddr;
2038
2039 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2040 if (!dsaddr)
2041 return NULL;
2042 return &dsaddr->id_node;
2043}
2044
2045static void
94e5c571 2046ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2047 const void *voidargs,
2048 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2049{
5b9b3c85 2050 const struct nfs4_layoutreturn_args *args = voidargs;
5ba6a09e 2051 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
d67ae825
TH		 2052 __be32 *start;
2053
2054 dprintk("%s: Begin\n", __func__);
2055 start = xdr_reserve_space(xdr, 4);
2056 BUG_ON(!start);
2057
5ba6a09e
TM		 2058 ff_layout_encode_ioerr(xdr, args, ff_args);
2059 ff_layout_encode_iostats_array(xdr, args, ff_args);
082fa37d 2060
d67ae825
TH		 2061 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2062 dprintk("%s: Return\n", __func__);
2063}
2064
5b9b3c85
TM		 2065static void
2066ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2067{
2068 struct nfs4_flexfile_layoutreturn_args *ff_args;
2069
2070 if (!args->data)
2071 return;
2072 ff_args = args->data;
2073 args->data = NULL;
2074
2075 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2076 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85
TM		 2077
2078 kfree(ff_args);
2079}
2080
2081const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2082 .encode = ff_layout_encode_layoutreturn,
2083 .free = ff_layout_free_layoutreturn,
2084};
2085
2086static int
2087ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2088{
2089 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2090 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85
TM		 2091
2092 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2093 if (!ff_args)
2094 return -ENOMEM;
2095
2096 INIT_LIST_HEAD(&ff_args->errors);
2097 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2098 &args->range, &ff_args->errors,
2099 FF_LAYOUTRETURN_MAXERR);
2100
230bc962
TM		 2101 spin_lock(&args->inode->i_lock);
2102 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2103 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2104 spin_unlock(&args->inode->i_lock);
2105
5b9b3c85
TM		 2106 args->ld_private->ops = &layoutreturn_ops;
2107 args->ld_private->data = ff_args;
2108 return 0;
2109}
2110
27c43064
PT		 2111static int
2112ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2113{
2114 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2115
2116 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2117}
2118
2119static size_t
2120ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2121 const int buflen)
2122{
2123 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2124 const struct in6_addr *addr = &sin6->sin6_addr;
2125
2126 /*
2127 * RFC 4291, Section 2.2.2
2128 *
2129 * Shorthanded ANY address
2130 */
2131 if (ipv6_addr_any(addr))
2132 return snprintf(buf, buflen, "::");
2133
2134 /*
2135 * RFC 4291, Section 2.2.2
2136 *
2137 * Shorthanded loopback address
2138 */
2139 if (ipv6_addr_loopback(addr))
2140 return snprintf(buf, buflen, "::1");
2141
2142 /*
2143 * RFC 4291, Section 2.2.3
2144 *
2145 * Special presentation address format for mapped v4
2146 * addresses.
2147 */
2148 if (ipv6_addr_v4mapped(addr))
2149 return snprintf(buf, buflen, "::ffff:%pI4",
2150 &addr->s6_addr32[3]);
2151
2152 /*
2153 * RFC 4291, Section 2.2.1
2154 */
2155 return snprintf(buf, buflen, "%pI6c", addr);
2156}
2157
2158/* Derived from rpc_sockaddr2uaddr */
2159static void
2160ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2161{
2162 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2163 char portbuf[RPCBIND_MAXUADDRPLEN];
2164 char addrbuf[RPCBIND_MAXUADDRLEN];
2165 char *netid;
2166 unsigned short port;
2167 int len, netid_len;
2168 __be32 *p;
2169
2170 switch (sap->sa_family) {
2171 case AF_INET:
2172 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2173 return;
2174 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2175 netid = "tcp";
2176 netid_len = 3;
2177 break;
2178 case AF_INET6:
2179 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2180 return;
2181 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2182 netid = "tcp6";
2183 netid_len = 4;
2184 break;
2185 default:
2186 /* we only support tcp and tcp6 */
2187 WARN_ON_ONCE(1);
2188 return;
2189 }
2190
2191 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2192 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2193
2194 p = xdr_reserve_space(xdr, 4 + netid_len);
2195 xdr_encode_opaque(p, netid, netid_len);
2196
2197 p = xdr_reserve_space(xdr, 4 + len);
2198 xdr_encode_opaque(p, addrbuf, len);
2199}
2200
2201static void
2202ff_layout_encode_nfstime(struct xdr_stream *xdr,
2203 ktime_t t)
2204{
2205 struct timespec64 ts;
2206 __be32 *p;
2207
2208 p = xdr_reserve_space(xdr, 12);
2209 ts = ktime_to_timespec64(t);
2210 p = xdr_encode_hyper(p, ts.tv_sec);
2211 *p++ = cpu_to_be32(ts.tv_nsec);
2212}
2213
2214static void
2215ff_layout_encode_io_latency(struct xdr_stream *xdr,
2216 struct nfs4_ff_io_stat *stat)
2217{
2218 __be32 *p;
2219
2220 p = xdr_reserve_space(xdr, 5 * 8);
2221 p = xdr_encode_hyper(p, stat->ops_requested);
2222 p = xdr_encode_hyper(p, stat->bytes_requested);
2223 p = xdr_encode_hyper(p, stat->ops_completed);
2224 p = xdr_encode_hyper(p, stat->bytes_completed);
2225 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2226 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2227 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2228}
2229
2230static void
422c93c8
TM		 2231ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2232 const struct nfs42_layoutstat_devinfo *devinfo,
2233 struct nfs4_ff_layout_mirror *mirror)
27c43064 2234{
27c43064
PT		 2235 struct nfs4_pnfs_ds_addr *da;
2236 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2237 struct nfs_fh *fh = &mirror->fh_versions[0];
422c93c8 2238 __be32 *p;
27c43064
PT		 2239
2240 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2241 dprintk("%s: DS %s: encoding address %s\n",
2242 __func__, ds->ds_remotestr, da->da_remotestr);
27c43064
PT		 2243 /* netaddr4 */
2244 ff_layout_encode_netaddr(xdr, da);
2245 /* nfs_fh4 */
2246 p = xdr_reserve_space(xdr, 4 + fh->size);
2247 xdr_encode_opaque(p, fh->data, fh->size);
2248 /* ff_io_latency4 read */
2249 spin_lock(&mirror->lock);
2250 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2251 /* ff_io_latency4 write */
2252 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2253 spin_unlock(&mirror->lock);
2254 /* nfstime4 */
2255 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2256 /* bool */
2257 p = xdr_reserve_space(xdr, 4);
2258 *p = cpu_to_be32(false);
422c93c8
TM		 2259}
2260
2261static void
2262ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2263 const struct nfs4_xdr_opaque_data *opaque)
2264{
2265 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2266 struct nfs42_layoutstat_devinfo, ld_private);
2267 __be32 *start;
2268
2269 /* layoutupdate length */
2270 start = xdr_reserve_space(xdr, 4);
2271 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
27c43064
PT		 2272
2273 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2274}
2275
422c93c8
TM		 2276static void
2277ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2278{
2279 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2280
2281 ff_layout_put_mirror(mirror);
2282}
2283
2284static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2285 .encode = ff_layout_encode_layoutstats,
2286 .free = ff_layout_free_layoutstats,
2287};
2288
266d12d4 2289static int
08e2e5bc
TM		 2290ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2291 struct nfs42_layoutstat_devinfo *devinfo,
266d12d4 2292 int dev_limit)
ad4dc53e 2293{
266d12d4 2294 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2295 struct nfs4_ff_layout_mirror *mirror;
2296 struct nfs4_deviceid_node *dev;
266d12d4 2297 int i = 0;
ad4dc53e 2298
266d12d4
TM		 2299 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2300 if (i >= dev_limit)
ad4dc53e 2301 break;
65990d1a 2302 if (IS_ERR_OR_NULL(mirror->mirror_ds))
27c43064 2303 continue;
06946c6a
TM		 2304 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2305 continue;
266d12d4
TM		 2306 /* mirror refcount put in cleanup_layoutstats */
2307 if (!atomic_inc_not_zero(&mirror->ref))
2308 continue;
2309 dev = &mirror->mirror_ds->id_node;
ad4dc53e 2310 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2311 devinfo->offset = 0;
2312 devinfo->length = NFS4_MAX_UINT64;
2f8220c1 2313 spin_lock(&mirror->lock);
d099d7b8 2314 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2315 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2316 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e 2317 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2f8220c1 2318 spin_unlock(&mirror->lock);
ad4dc53e 2319 devinfo->layout_type = LAYOUT_FLEX_FILES;
422c93c8
TM		 2320 devinfo->ld_private.ops = &layoutstat_ops;
2321 devinfo->ld_private.data = mirror;
ad4dc53e 2322
08e2e5bc 2323 devinfo++;
266d12d4 2324 i++;
ad4dc53e 2325 }
266d12d4 2326 return i;
ad4dc53e
PT		 2327}
2328
2329static int
2330ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2331{
266d12d4 2332 struct nfs4_flexfile_layout *ff_layout;
08e2e5bc 2333 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
ad4dc53e 2334
ad4dc53e 2335 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
266d12d4 2336 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2337 if (!args->devinfo)
2338 return -ENOMEM;
2339
ad4dc53e 2340 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2341 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2342 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2343 &args->devinfo[0], dev_count);
ad4dc53e 2344 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2345 if (!args->num_dev) {
2346 kfree(args->devinfo);
2347 args->devinfo = NULL;
2348 return -ENOENT;
2349 }
ad4dc53e
PT		 2350
2351 return 0;
2352}
2353
d67ae825
TH		 2354static struct pnfs_layoutdriver_type flexfilelayout_type = {
2355 .id = LAYOUT_FLEX_FILES,
2356 .name = "LAYOUT_FLEX_FILES",
2357 .owner = THIS_MODULE,
2358 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2359 .free_layout_hdr = ff_layout_free_layout_hdr,
2360 .alloc_lseg = ff_layout_alloc_lseg,
2361 .free_lseg = ff_layout_free_lseg,
0762ed2c 2362 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2363 .pg_read_ops = &ff_layout_pg_read_ops,
2364 .pg_write_ops = &ff_layout_pg_write_ops,
2365 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2366 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 2367 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 2368 .clear_request_commit = pnfs_generic_clear_request_commit,
2369 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2370 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2371 .commit_pagelist = ff_layout_commit_pagelist,
2372 .read_pagelist = ff_layout_read_pagelist,
2373 .write_pagelist = ff_layout_write_pagelist,
2374 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2375 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2376 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2377 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2378};
2379
2380static int __init nfs4flexfilelayout_init(void)
2381{
2382 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2383 __func__);
90a0be00
JL		 2384 if (!ff_zero_group) {
2385 ff_zero_group = groups_alloc(0);
2386 if (!ff_zero_group)
2387 return -ENOMEM;
2388 }
d67ae825
TH		 2389 return pnfs_register_layoutdriver(&flexfilelayout_type);
2390}
2391
2392static void __exit nfs4flexfilelayout_exit(void)
2393{
2394 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2395 __func__);
2396 pnfs_unregister_layoutdriver(&flexfilelayout_type);
90a0be00
JL		 2397 if (ff_zero_group) {
2398 put_group_info(ff_zero_group);
2399 ff_zero_group = NULL;
2400 }
d67ae825
TH		 2401}
2402
2403MODULE_ALIAS("nfs-layouttype4-4");
2404
2405MODULE_LICENSE("GPL");
2406MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2407
2408module_init(nfs4flexfilelayout_init);
2409module_exit(nfs4flexfilelayout_exit);
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