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nfsd: Fix error return code in nfsd_file_cache_init()
[people/ms/linux.git] / fs / nfs / flexfilelayout / flexfilelayout.c
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09c434b8 1// SPDX-License-Identifier: GPL-2.0-only
d67ae825
TH		 2/*
3 * Module for pnfs flexfile layout driver.
4 *
5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6 *
7 * Tao Peng <bergwolf@primarydata.com>
8 */
9
10#include <linux/nfs_fs.h>
7af46292 11#include <linux/nfs_mount.h>
d67ae825
TH		 12#include <linux/nfs_page.h>
13#include <linux/module.h>
97f68c6b 14#include <linux/sched/mm.h>
d67ae825
TH		 15
16#include <linux/sunrpc/metrics.h>
d67ae825
TH		 17
18#include "flexfilelayout.h"
19#include "../nfs4session.h"
40c64c26 20#include "../nfs4idmap.h"
d67ae825
TH		 21#include "../internal.h"
22#include "../delegation.h"
23#include "../nfs4trace.h"
24#include "../iostat.h"
25#include "../nfs.h"
ad4dc53e 26#include "../nfs42.h"
d67ae825
TH		 27
28#define NFSDBG_FACILITY NFSDBG_PNFS_LD
29
30#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
5b9b3c85
TM		 31#define FF_LAYOUTRETURN_MAXERR 20
32
33344e0f
TM		 33static unsigned short io_maxretrans;
34
9c455a8c 35static const struct pnfs_commit_ops ff_layout_commit_ops;
54e4a0df
TM		 36static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
37 struct nfs_pgio_header *hdr);
230bc962
TM		 38static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
39 struct nfs42_layoutstat_devinfo *devinfo,
40 int dev_limit);
41static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
42 const struct nfs42_layoutstat_devinfo *devinfo,
43 struct nfs4_ff_layout_mirror *mirror);
54e4a0df 44
d67ae825
TH		 45static struct pnfs_layout_hdr *
46ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
47{
48 struct nfs4_flexfile_layout *ffl;
49
50 ffl = kzalloc(sizeof(*ffl), gfp_flags);
51 if (ffl) {
c21e7168 52 pnfs_init_ds_commit_info(&ffl->commit_info);
d67ae825 53 INIT_LIST_HEAD(&ffl->error_list);
266d12d4 54 INIT_LIST_HEAD(&ffl->mirrors);
1c8d477a 55 ffl->last_report_time = ktime_get();
9c455a8c 56 ffl->commit_info.ops = &ff_layout_commit_ops;
d67ae825
TH		 57 return &ffl->generic_hdr;
58 } else
59 return NULL;
60}
61
62static void
63ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
64{
cf6605d1 65 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
d67ae825
TH		 66 struct nfs4_ff_layout_ds_err *err, *n;
67
cf6605d1 68 list_for_each_entry_safe(err, n, &ffl->error_list, list) {
d67ae825
TH		 69 list_del(&err->list);
70 kfree(err);
71 }
cf6605d1 72 kfree_rcu(ffl, generic_hdr.plh_rcu);
d67ae825
TH		 73}
74
93b717fd 75static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
d67ae825
TH		 76{
77 __be32 *p;
78
79 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
80 if (unlikely(p == NULL))
81 return -ENOBUFS;
93b717fd
TM		 82 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
83 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
d67ae825
TH		 84 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
85 p[0], p[1], p[2], p[3]);
86 return 0;
87}
88
89static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
90{
91 __be32 *p;
92
93 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
94 if (unlikely(!p))
95 return -ENOBUFS;
96 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
97 nfs4_print_deviceid(devid);
98 return 0;
99}
100
101static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
102{
103 __be32 *p;
104
105 p = xdr_inline_decode(xdr, 4);
106 if (unlikely(!p))
107 return -ENOBUFS;
108 fh->size = be32_to_cpup(p++);
109 if (fh->size > sizeof(struct nfs_fh)) {
110 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
111 fh->size);
112 return -EOVERFLOW;
113 }
114 /* fh.data */
115 p = xdr_inline_decode(xdr, fh->size);
116 if (unlikely(!p))
117 return -ENOBUFS;
118 memcpy(&fh->data, p, fh->size);
119 dprintk("%s: fh len %d\n", __func__, fh->size);
120
121 return 0;
122}
123
124/*
125 * Currently only stringified uids and gids are accepted.
126 * I.e., kerberos is not supported to the DSes, so no pricipals.
127 *
128 * That means that one common function will suffice, but when
129 * principals are added, this should be split to accomodate
130 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
131 */
132static int
133decode_name(struct xdr_stream *xdr, u32 *id)
134{
135 __be32 *p;
136 int len;
137
138 /* opaque_length(4)*/
139 p = xdr_inline_decode(xdr, 4);
140 if (unlikely(!p))
141 return -ENOBUFS;
142 len = be32_to_cpup(p++);
143 if (len < 0)
144 return -EINVAL;
145
146 dprintk("%s: len %u\n", __func__, len);
147
148 /* opaque body */
149 p = xdr_inline_decode(xdr, len);
150 if (unlikely(!p))
151 return -ENOBUFS;
152
153 if (!nfs_map_string_to_numeric((char *)p, len, id))
154 return -EINVAL;
155
156 return 0;
157}
158
266d12d4
TM		 159static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
160 const struct nfs4_ff_layout_mirror *m2)
161{
162 int i, j;
163
164 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
165 return false;
166 for (i = 0; i < m1->fh_versions_cnt; i++) {
167 bool found_fh = false;
86fb449b 168 for (j = 0; j < m2->fh_versions_cnt; j++) {
266d12d4
TM		 169 if (nfs_compare_fh(&m1->fh_versions[i],
170 &m2->fh_versions[j]) == 0) {
171 found_fh = true;
172 break;
173 }
174 }
175 if (!found_fh)
176 return false;
177 }
178 return true;
179}
180
181static struct nfs4_ff_layout_mirror *
182ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
183 struct nfs4_ff_layout_mirror *mirror)
184{
185 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
186 struct nfs4_ff_layout_mirror *pos;
187 struct inode *inode = lo->plh_inode;
188
189 spin_lock(&inode->i_lock);
190 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
65990d1a 191 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
266d12d4
TM		 192 continue;
193 if (!ff_mirror_match_fh(mirror, pos))
194 continue;
81a090b9 195 if (refcount_inc_not_zero(&pos->ref)) {
266d12d4
TM		 196 spin_unlock(&inode->i_lock);
197 return pos;
198 }
199 }
200 list_add(&mirror->mirrors, &ff_layout->mirrors);
201 mirror->layout = lo;
202 spin_unlock(&inode->i_lock);
203 return mirror;
204}
205
e3b1df2d 206static void
266d12d4
TM		 207ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
208{
209 struct inode *inode;
210 if (mirror->layout == NULL)
211 return;
212 inode = mirror->layout->plh_inode;
213 spin_lock(&inode->i_lock);
214 list_del(&mirror->mirrors);
215 spin_unlock(&inode->i_lock);
216 mirror->layout = NULL;
217}
218
28a0d72c
TM		 219static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
220{
221 struct nfs4_ff_layout_mirror *mirror;
222
223 mirror = kzalloc(sizeof(*mirror), gfp_flags);
224 if (mirror != NULL) {
225 spin_lock_init(&mirror->lock);
81a090b9 226 refcount_set(&mirror->ref, 1);
266d12d4 227 INIT_LIST_HEAD(&mirror->mirrors);
28a0d72c
TM		 228 }
229 return mirror;
230}
231
232static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
233{
a52458b4 234 const struct cred *cred;
3064b686 235
266d12d4 236 ff_layout_remove_mirror(mirror);
28a0d72c 237 kfree(mirror->fh_versions);
3064b686 238 cred = rcu_access_pointer(mirror->ro_cred);
a52458b4 239 put_cred(cred);
3064b686 240 cred = rcu_access_pointer(mirror->rw_cred);
a52458b4 241 put_cred(cred);
28a0d72c
TM		 242 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
243 kfree(mirror);
244}
245
246static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
247{
81a090b9 248 if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
28a0d72c
TM		 249 ff_layout_free_mirror(mirror);
250}
251
d67ae825
TH		 252static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
253{
329651b1
TM		 254 u32 i;
255
256 for (i = 0; i < fls->mirror_array_cnt; i++)
257 ff_layout_put_mirror(fls->mirror_array[i]);
d67ae825
TH		 258}
259
d67ae825
TH		 260static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
261{
262 if (fls) {
263 ff_layout_free_mirror_array(fls);
264 kfree(fls);
265 }
266}
267
660d1eb2
TM		 268static bool
269ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
270 struct pnfs_layout_segment *l2)
271{
272 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
273 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
274 u32 i;
275
276 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
277 return false;
278 for (i = 0; i < fl1->mirror_array_cnt; i++) {
279 if (fl1->mirror_array[i] != fl2->mirror_array[i])
280 return false;
281 }
282 return true;
283}
284
0762ed2c
TM		 285static bool
286ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
287 const struct pnfs_layout_range *l2)
288{
289 u64 end1, end2;
290
291 if (l1->iomode != l2->iomode)
292 return l1->iomode != IOMODE_READ;
293 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
294 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
295 if (end1 < l2->offset)
296 return false;
297 if (end2 < l1->offset)
298 return true;
299 return l2->offset <= l1->offset;
300}
301
302static bool
303ff_lseg_merge(struct pnfs_layout_segment *new,
304 struct pnfs_layout_segment *old)
305{
306 u64 new_end, old_end;
307
ee26bdd6
JL		 308 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
309 return false;
0762ed2c
TM		 310 if (new->pls_range.iomode != old->pls_range.iomode)
311 return false;
312 old_end = pnfs_calc_offset_end(old->pls_range.offset,
313 old->pls_range.length);
314 if (old_end < new->pls_range.offset)
315 return false;
316 new_end = pnfs_calc_offset_end(new->pls_range.offset,
317 new->pls_range.length);
318 if (new_end < old->pls_range.offset)
319 return false;
660d1eb2
TM		 320 if (!ff_lseg_match_mirrors(new, old))
321 return false;
0762ed2c
TM		 322
323 /* Mergeable: copy info from 'old' to 'new' */
324 if (new_end < old_end)
325 new_end = old_end;
326 if (new->pls_range.offset < old->pls_range.offset)
327 new->pls_range.offset = old->pls_range.offset;
328 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
329 new_end);
330 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
331 set_bit(NFS_LSEG_ROC, &new->pls_flags);
0762ed2c
TM		 332 return true;
333}
334
335static void
336ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
337 struct pnfs_layout_segment *lseg,
338 struct list_head *free_me)
339{
340 pnfs_generic_layout_insert_lseg(lo, lseg,
341 ff_lseg_range_is_after,
342 ff_lseg_merge,
343 free_me);
344}
345
d67ae825
TH		 346static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
347{
d67ae825
TH		 348 int i, j;
349
350 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
351 for (j = i + 1; j < fls->mirror_array_cnt; j++)
352 if (fls->mirror_array[i]->efficiency <
455b6ee6
FF		 353 fls->mirror_array[j]->efficiency)
354 swap(fls->mirror_array[i],
355 fls->mirror_array[j]);
d67ae825
TH		 356 }
357}
358
359static struct pnfs_layout_segment *
360ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
361 struct nfs4_layoutget_res *lgr,
362 gfp_t gfp_flags)
363{
364 struct pnfs_layout_segment *ret;
365 struct nfs4_ff_layout_segment *fls = NULL;
366 struct xdr_stream stream;
367 struct xdr_buf buf;
368 struct page *scratch;
369 u64 stripe_unit;
370 u32 mirror_array_cnt;
371 __be32 *p;
372 int i, rc;
373
374 dprintk("--> %s\n", __func__);
375 scratch = alloc_page(gfp_flags);
376 if (!scratch)
377 return ERR_PTR(-ENOMEM);
378
379 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
380 lgr->layoutp->len);
381 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
382
383 /* stripe unit and mirror_array_cnt */
384 rc = -EIO;
385 p = xdr_inline_decode(&stream, 8 + 4);
386 if (!p)
387 goto out_err_free;
388
389 p = xdr_decode_hyper(p, &stripe_unit);
390 mirror_array_cnt = be32_to_cpup(p++);
391 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
392 stripe_unit, mirror_array_cnt);
393
394 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
395 mirror_array_cnt == 0)
396 goto out_err_free;
397
398 rc = -ENOMEM;
329651b1
TM		 399 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt),
400 gfp_flags);
d67ae825
TH		 401 if (!fls)
402 goto out_err_free;
403
404 fls->mirror_array_cnt = mirror_array_cnt;
405 fls->stripe_unit = stripe_unit;
d67ae825
TH		 406
407 for (i = 0; i < fls->mirror_array_cnt; i++) {
266d12d4 408 struct nfs4_ff_layout_mirror *mirror;
97f68c6b 409 struct cred *kcred;
762bb7e9 410 const struct cred __rcu *cred;
8276c902
N		 411 kuid_t uid;
412 kgid_t gid;
90a0be00 413 u32 ds_count, fh_count, id;
d67ae825
TH		 414 int j;
415
416 rc = -EIO;
417 p = xdr_inline_decode(&stream, 4);
418 if (!p)
419 goto out_err_free;
420 ds_count = be32_to_cpup(p);
421
422 /* FIXME: allow for striping? */
423 if (ds_count != 1)
424 goto out_err_free;
425
28a0d72c 426 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
d67ae825
TH		 427 if (fls->mirror_array[i] == NULL) {
428 rc = -ENOMEM;
429 goto out_err_free;
430 }
431
d67ae825
TH		 432 fls->mirror_array[i]->ds_count = ds_count;
433
434 /* deviceid */
65990d1a 435 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
d67ae825
TH		 436 if (rc)
437 goto out_err_free;
438
d67ae825
TH		 439 /* efficiency */
440 rc = -EIO;
441 p = xdr_inline_decode(&stream, 4);
442 if (!p)
443 goto out_err_free;
444 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
445
446 /* stateid */
93b717fd 447 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
d67ae825
TH		 448 if (rc)
449 goto out_err_free;
450
451 /* fh */
662f9a10 452 rc = -EIO;
d67ae825
TH		 453 p = xdr_inline_decode(&stream, 4);
454 if (!p)
455 goto out_err_free;
456 fh_count = be32_to_cpup(p);
457
458 fls->mirror_array[i]->fh_versions =
6396bb22 459 kcalloc(fh_count, sizeof(struct nfs_fh),
d67ae825
TH		 460 gfp_flags);
461 if (fls->mirror_array[i]->fh_versions == NULL) {
462 rc = -ENOMEM;
463 goto out_err_free;
464 }
465
466 for (j = 0; j < fh_count; j++) {
467 rc = decode_nfs_fh(&stream,
468 &fls->mirror_array[i]->fh_versions[j]);
469 if (rc)
470 goto out_err_free;
471 }
472
473 fls->mirror_array[i]->fh_versions_cnt = fh_count;
474
475 /* user */
90a0be00 476 rc = decode_name(&stream, &id);
d67ae825
TH		 477 if (rc)
478 goto out_err_free;
479
8276c902 480 uid = make_kuid(&init_user_ns, id);
90a0be00 481
d67ae825 482 /* group */
90a0be00 483 rc = decode_name(&stream, &id);
d67ae825
TH		 484 if (rc)
485 goto out_err_free;
486
8276c902 487 gid = make_kgid(&init_user_ns, id);
90a0be00 488
97f68c6b
N		 489 if (gfp_flags & __GFP_FS)
490 kcred = prepare_kernel_cred(NULL);
491 else {
492 unsigned int nofs_flags = memalloc_nofs_save();
493 kcred = prepare_kernel_cred(NULL);
494 memalloc_nofs_restore(nofs_flags);
495 }
496 rc = -ENOMEM;
497 if (!kcred)
498 goto out_err_free;
8276c902
N		 499 kcred->fsuid = uid;
500 kcred->fsgid = gid;
762bb7e9 501 cred = RCU_INITIALIZER(kcred);
90a0be00 502
3064b686
JL		 503 if (lgr->range.iomode == IOMODE_READ)
504 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
505 else
506 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
90a0be00 507
266d12d4
TM		 508 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
509 if (mirror != fls->mirror_array[i]) {
90a0be00 510 /* swap cred ptrs so free_mirror will clean up old */
3064b686
JL		 511 if (lgr->range.iomode == IOMODE_READ) {
512 cred = xchg(&mirror->ro_cred, cred);
513 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
514 } else {
515 cred = xchg(&mirror->rw_cred, cred);
516 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
517 }
266d12d4
TM		 518 ff_layout_free_mirror(fls->mirror_array[i]);
519 fls->mirror_array[i] = mirror;
520 }
521
3064b686
JL		 522 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
523 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
8276c902
N		 524 from_kuid(&init_user_ns, uid),
525 from_kgid(&init_user_ns, gid));
d67ae825
TH		 526 }
527
c0f5f505 528 p = xdr_inline_decode(&stream, 4);
d0379a5d
TM		 529 if (!p)
530 goto out_sort_mirrors;
531 fls->flags = be32_to_cpup(p);
532
533 p = xdr_inline_decode(&stream, 4);
534 if (!p)
535 goto out_sort_mirrors;
536 for (i=0; i < fls->mirror_array_cnt; i++)
537 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
c0f5f505 538
d0379a5d 539out_sort_mirrors:
d67ae825 540 ff_layout_sort_mirrors(fls);
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
d67ae825
TH		 553static void
554ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
555{
556 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 557
558 dprintk("--> %s\n", __func__);
559
d67ae825
TH		 560 if (lseg->pls_range.iomode == IOMODE_RW) {
561 struct nfs4_flexfile_layout *ffl;
562 struct inode *inode;
563
564 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
565 inode = ffl->generic_hdr.plh_inode;
566 spin_lock(&inode->i_lock);
a9901899 567 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
d67ae825
TH		 568 spin_unlock(&inode->i_lock);
569 }
570 _ff_layout_free_lseg(fls);
571}
572
abcb7bfc 573static void
e76d28dd 574nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 575{
9bbd9bb4
PT		 576 /* first IO request? */
577 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 578 timer->start_time = now;
abcb7bfc
TM		 579 }
580}
581
582static ktime_t
e76d28dd 583nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 584{
e76d28dd 585 ktime_t start;
abcb7bfc 586
9bbd9bb4
PT		 587 if (atomic_dec_return(&timer->n_ops) < 0)
588 WARN_ON_ONCE(1);
589
9bbd9bb4
PT		 590 start = timer->start_time;
591 timer->start_time = now;
abcb7bfc
TM		 592 return ktime_sub(now, start);
593}
594
97ba375b 595static bool
d983803d 596nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 597 struct nfs4_ff_layoutstat *layoutstat,
598 ktime_t now)
abcb7bfc 599{
bbf58bf3 600 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
1c8d477a 601 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
d983803d 602
e76d28dd 603 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
1f3a8e49 604 if (!mirror->start_time)
9bbd9bb4 605 mirror->start_time = now;
d0379a5d
TM		 606 if (mirror->report_interval != 0)
607 report_interval = (s64)mirror->report_interval * 1000LL;
608 else if (layoutstats_timer != 0)
bbf58bf3 609 report_interval = (s64)layoutstats_timer * 1000LL;
1c8d477a 610 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
bbf58bf3 611 report_interval) {
1c8d477a 612 ffl->last_report_time = now;
97ba375b
PT		 613 return true;
614 }
615
616 return false;
abcb7bfc
TM		 617}
618
619static void
620nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
621 __u64 requested)
622{
623 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
624
625 iostat->ops_requested++;
626 iostat->bytes_requested += requested;
627}
628
629static void
630nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
631 __u64 requested,
632 __u64 completed,
e76d28dd
TM		 633 ktime_t time_completed,
634 ktime_t time_started)
abcb7bfc
TM		 635{
636 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 637 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 638 ktime_t timer;
639
640 iostat->ops_completed++;
641 iostat->bytes_completed += completed;
642 iostat->bytes_not_delivered += requested - completed;
643
e76d28dd 644 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 645 iostat->total_busy_time =
646 ktime_add(iostat->total_busy_time, timer);
647 iostat->aggregate_completion_time =
e76d28dd
TM		 648 ktime_add(iostat->aggregate_completion_time,
649 completion_time);
abcb7bfc
TM		 650}
651
652static void
0b7baf94
TM		 653nfs4_ff_layout_stat_io_start_read(struct inode *inode,
654 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 655 __u64 requested, ktime_t now)
abcb7bfc 656{
97ba375b
PT		 657 bool report;
658
abcb7bfc 659 spin_lock(&mirror->lock);
e76d28dd 660 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
abcb7bfc 661 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
06946c6a 662 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 663 spin_unlock(&mirror->lock);
97ba375b
PT		 664
665 if (report)
0b7baf94 666 pnfs_report_layoutstat(inode, GFP_KERNEL);
abcb7bfc
TM		 667}
668
669static void
670nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
671 struct nfs4_ff_layout_mirror *mirror,
672 __u64 requested,
673 __u64 completed)
674{
675 spin_lock(&mirror->lock);
676 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
677 requested, completed,
e76d28dd 678 ktime_get(), task->tk_start);
06946c6a 679 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 680 spin_unlock(&mirror->lock);
681}
682
683static void
0b7baf94
TM		 684nfs4_ff_layout_stat_io_start_write(struct inode *inode,
685 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 686 __u64 requested, ktime_t now)
abcb7bfc 687{
97ba375b
PT		 688 bool report;
689
abcb7bfc 690 spin_lock(&mirror->lock);
e76d28dd 691 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc 692 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
06946c6a 693 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 694 spin_unlock(&mirror->lock);
97ba375b
PT		 695
696 if (report)
0b7baf94 697 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 698}
699
700static void
701nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
702 struct nfs4_ff_layout_mirror *mirror,
703 __u64 requested,
704 __u64 completed,
705 enum nfs3_stable_how committed)
706{
707 if (committed == NFS_UNSTABLE)
708 requested = completed = 0;
709
710 spin_lock(&mirror->lock);
711 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 712 requested, completed, ktime_get(), task->tk_start);
06946c6a 713 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 714 spin_unlock(&mirror->lock);
715}
716
76c66905 717static void
b9df46d0 718ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx)
76c66905
TM		 719{
720 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
721
722 if (devid)
723 nfs4_mark_deviceid_unavailable(devid);
724}
725
726static void
b9df46d0 727ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
76c66905
TM		 728{
729 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
730
731 if (devid)
732 nfs4_mark_deviceid_available(devid);
733}
734
d67ae825 735static struct nfs4_pnfs_ds *
76c66905 736ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
b9df46d0 737 u32 start_idx, u32 *best_idx,
76c66905 738 bool check_device)
d67ae825 739{
13544412 740 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
2444ff27 741 struct nfs4_ff_layout_mirror *mirror;
d67ae825 742 struct nfs4_pnfs_ds *ds;
3dc14735 743 bool fail_return = false;
b9df46d0 744 u32 idx;
d67ae825 745
76c66905 746 /* mirrors are initially sorted by efficiency */
13544412 747 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
3dc14735 748 if (idx+1 == fls->mirror_array_cnt)
76c66905 749 fail_return = !check_device;
2444ff27
TM		 750
751 mirror = FF_LAYOUT_COMP(lseg, idx);
76c66905
TM		 752 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return);
753 if (!ds)
2444ff27
TM		 754 continue;
755
76c66905
TM		 756 if (check_device &&
757 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
758 continue;
759
760 *best_idx = idx;
761 return ds;
d67ae825
TH		 762 }
763
764 return NULL;
765}
766
76c66905
TM		 767static struct nfs4_pnfs_ds *
768ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
b9df46d0 769 u32 start_idx, u32 *best_idx)
76c66905
TM		 770{
771 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
772}
773
774static struct nfs4_pnfs_ds *
775ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
b9df46d0 776 u32 start_idx, u32 *best_idx)
76c66905
TM		 777{
778 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
779}
780
781static struct nfs4_pnfs_ds *
782ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
b9df46d0 783 u32 start_idx, u32 *best_idx)
76c66905
TM		 784{
785 struct nfs4_pnfs_ds *ds;
786
787 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
788 if (ds)
789 return ds;
790 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
791}
792
563c53e7 793static struct nfs4_pnfs_ds *
b9df46d0
TM		 794ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
795 u32 *best_idx)
563c53e7
TM		 796{
797 struct pnfs_layout_segment *lseg = pgio->pg_lseg;
798 struct nfs4_pnfs_ds *ds;
799
800 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
801 best_idx);
802 if (ds || !pgio->pg_mirror_idx)
803 return ds;
804 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
805}
806
c7d73af2
TH		 807static void
808ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
809 struct nfs_page *req,
810 bool strict_iomode)
811{
c7d73af2
TH		 812 pnfs_put_lseg(pgio->pg_lseg);
813 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 814 nfs_req_openctx(req),
cbd7be43
TM		 815 req_offset(req),
816 req->wb_bytes,
c7d73af2
TH		 817 IOMODE_READ,
818 strict_iomode,
819 GFP_KERNEL);
820 if (IS_ERR(pgio->pg_lseg)) {
821 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
822 pgio->pg_lseg = NULL;
823 }
c7d73af2
TH		 824}
825
e1e54ab7
TM		 826static void
827ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
828 struct nfs_page *req)
829{
830 pnfs_generic_pg_check_layout(pgio);
831 pnfs_generic_pg_check_range(pgio, req);
832}
833
d67ae825
TH		 834static void
835ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
836 struct nfs_page *req)
837{
838 struct nfs_pgio_mirror *pgm;
839 struct nfs4_ff_layout_mirror *mirror;
840 struct nfs4_pnfs_ds *ds;
b9df46d0 841 u32 ds_idx, i;
d67ae825 842
3dc14735 843retry:
e1e54ab7 844 ff_layout_pg_check_layout(pgio, req);
d67ae825 845 /* Use full layout for now */
1c1aeaf1 846 if (!pgio->pg_lseg) {
c7d73af2 847 ff_layout_pg_get_read(pgio, req, false);
1c1aeaf1
TM		 848 if (!pgio->pg_lseg)
849 goto out_nolseg;
850 }
851 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
c7d73af2 852 ff_layout_pg_get_read(pgio, req, true);
1c1aeaf1
TM		 853 if (!pgio->pg_lseg)
854 goto out_nolseg;
855 }
d67ae825 856
563c53e7 857 ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
446ca219 858 if (!ds) {
3dc14735 859 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 860 goto out_mds;
f97ff92b 861 pnfs_generic_pg_cleanup(pgio);
3dc14735
TM		 862 /* Sleep for 1 second before retrying */
863 ssleep(1);
864 goto retry;
446ca219
TH		 865 }
866
ee15c7b5
TM		 867 for (i = 0; i < pgio->pg_mirror_count; i++) {
868 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
869 pgm = &pgio->pg_mirrors[i];
870 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
871 }
d67ae825
TH		 872
873 pgio->pg_mirror_idx = ds_idx;
874
7af46292
TM		 875 if (NFS_SERVER(pgio->pg_inode)->flags &
876 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
877 pgio->pg_maxretrans = io_maxretrans;
d67ae825 878 return;
1c1aeaf1
TM		 879out_nolseg:
880 if (pgio->pg_error < 0)
881 return;
d67ae825 882out_mds:
d5b9216f
TM		 883 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
884 0, NFS4_MAX_UINT64, IOMODE_READ,
885 NFS_I(pgio->pg_inode)->layout,
886 pgio->pg_lseg);
7af46292 887 pgio->pg_maxretrans = 0;
d67ae825
TH		 888 nfs_pageio_reset_read_mds(pgio);
889}
890
891static void
892ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
893 struct nfs_page *req)
894{
895 struct nfs4_ff_layout_mirror *mirror;
896 struct nfs_pgio_mirror *pgm;
d67ae825 897 struct nfs4_pnfs_ds *ds;
b9df46d0 898 u32 i;
d67ae825 899
3dc14735 900retry:
e1e54ab7 901 ff_layout_pg_check_layout(pgio, req);
d600ad1f 902 if (!pgio->pg_lseg) {
d67ae825 903 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 904 nfs_req_openctx(req),
cbd7be43
TM		 905 req_offset(req),
906 req->wb_bytes,
d67ae825 907 IOMODE_RW,
c7d73af2 908 false,
d67ae825 909 GFP_NOFS);
d600ad1f
PT		 910 if (IS_ERR(pgio->pg_lseg)) {
911 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
912 pgio->pg_lseg = NULL;
913 return;
914 }
915 }
d67ae825
TH		 916 /* If no lseg, fall back to write through mds */
917 if (pgio->pg_lseg == NULL)
918 goto out_mds;
919
d67ae825 920 /* Use a direct mapping of ds_idx to pgio mirror_idx */
8b040137
TM		 921 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
922 goto out_eagain;
d67ae825
TH		 923
924 for (i = 0; i < pgio->pg_mirror_count; i++) {
2444ff27 925 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
2444ff27 926 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
446ca219 927 if (!ds) {
3dc14735 928 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 929 goto out_mds;
f97ff92b 930 pnfs_generic_pg_cleanup(pgio);
3dc14735
TM		 931 /* Sleep for 1 second before retrying */
932 ssleep(1);
933 goto retry;
446ca219 934 }
d67ae825 935 pgm = &pgio->pg_mirrors[i];
d67ae825
TH		 936 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
937 }
938
7af46292
TM		 939 if (NFS_SERVER(pgio->pg_inode)->flags &
940 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
941 pgio->pg_maxretrans = io_maxretrans;
d67ae825 942 return;
8b040137
TM		 943out_eagain:
944 pnfs_generic_pg_cleanup(pgio);
945 pgio->pg_error = -EAGAIN;
946 return;
d67ae825 947out_mds:
d5b9216f
TM		 948 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
949 0, NFS4_MAX_UINT64, IOMODE_RW,
950 NFS_I(pgio->pg_inode)->layout,
951 pgio->pg_lseg);
7af46292 952 pgio->pg_maxretrans = 0;
d67ae825 953 nfs_pageio_reset_write_mds(pgio);
8b040137 954 pgio->pg_error = -EAGAIN;
d67ae825
TH		 955}
956
957static unsigned int
958ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
959 struct nfs_page *req)
960{
d600ad1f 961 if (!pgio->pg_lseg) {
d67ae825 962 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 963 nfs_req_openctx(req),
18eb87f4
TM		 964 req_offset(req),
965 req->wb_bytes,
d67ae825 966 IOMODE_RW,
c7d73af2 967 false,
d67ae825 968 GFP_NOFS);
d600ad1f
PT		 969 if (IS_ERR(pgio->pg_lseg)) {
970 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
971 pgio->pg_lseg = NULL;
972 goto out;
973 }
974 }
d67ae825
TH		 975 if (pgio->pg_lseg)
976 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
977
d5b9216f
TM		 978 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
979 0, NFS4_MAX_UINT64, IOMODE_RW,
980 NFS_I(pgio->pg_inode)->layout,
981 pgio->pg_lseg);
d67ae825 982 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 983 nfs_pageio_reset_write_mds(pgio);
d600ad1f 984out:
d67ae825
TH		 985 return 1;
986}
987
988static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
989 .pg_init = ff_layout_pg_init_read,
990 .pg_test = pnfs_generic_pg_test,
991 .pg_doio = pnfs_generic_pg_readpages,
992 .pg_cleanup = pnfs_generic_pg_cleanup,
993};
994
995static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
996 .pg_init = ff_layout_pg_init_write,
997 .pg_test = pnfs_generic_pg_test,
998 .pg_doio = pnfs_generic_pg_writepages,
999 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1000 .pg_cleanup = pnfs_generic_pg_cleanup,
1001};
1002
1003static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1004{
1005 struct rpc_task *task = &hdr->task;
1006
1007 pnfs_layoutcommit_inode(hdr->inode, false);
1008
1009 if (retry_pnfs) {
1010 dprintk("%s Reset task %5u for i/o through pNFS "
1011 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1012 hdr->task.tk_pid,
1013 hdr->inode->i_sb->s_id,
1014 (unsigned long long)NFS_FILEID(hdr->inode),
1015 hdr->args.count,
1016 (unsigned long long)hdr->args.offset);
1017
dc602dd7 1018 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1019 return;
1020 }
1021
1022 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1023 dprintk("%s Reset task %5u for i/o through MDS "
1024 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1025 hdr->task.tk_pid,
1026 hdr->inode->i_sb->s_id,
1027 (unsigned long long)NFS_FILEID(hdr->inode),
1028 hdr->args.count,
1029 (unsigned long long)hdr->args.offset);
1030
d5b9216f
TM		 1031 trace_pnfs_mds_fallback_write_done(hdr->inode,
1032 hdr->args.offset, hdr->args.count,
1033 IOMODE_RW, NFS_I(hdr->inode)->layout,
1034 hdr->lseg);
d67ae825
TH		 1035 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1036 }
1037}
1038
563c53e7
TM		 1039static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1040{
1041 u32 idx = hdr->pgio_mirror_idx + 1;
b9df46d0 1042 u32 new_idx = 0;
563c53e7
TM		 1043
1044 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx + 1, &new_idx))
1045 ff_layout_send_layouterror(hdr->lseg);
1046 else
1047 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1048 pnfs_read_resend_pnfs(hdr, new_idx);
1049}
1050
d67ae825
TH		 1051static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1052{
1053 struct rpc_task *task = &hdr->task;
1054
1055 pnfs_layoutcommit_inode(hdr->inode, false);
563c53e7 1056 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
d67ae825
TH		 1057
1058 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1059 dprintk("%s Reset task %5u for i/o through MDS "
1060 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1061 hdr->task.tk_pid,
1062 hdr->inode->i_sb->s_id,
1063 (unsigned long long)NFS_FILEID(hdr->inode),
1064 hdr->args.count,
1065 (unsigned long long)hdr->args.offset);
1066
d5b9216f
TM		 1067 trace_pnfs_mds_fallback_read_done(hdr->inode,
1068 hdr->args.offset, hdr->args.count,
1069 IOMODE_READ, NFS_I(hdr->inode)->layout,
1070 hdr->lseg);
d67ae825
TH		 1071 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1072 }
1073}
1074
1075static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1076 struct nfs4_state *state,
1077 struct nfs_client *clp,
1078 struct pnfs_layout_segment *lseg,
b9df46d0 1079 u32 idx)
d67ae825
TH		 1080{
1081 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1082 struct inode *inode = lo->plh_inode;
d67ae825 1083 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
d67ae825
TH		 1084 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1085
d67ae825 1086 switch (task->tk_status) {
d67ae825
TH		 1087 case -NFS4ERR_BADSESSION:
1088 case -NFS4ERR_BADSLOT:
1089 case -NFS4ERR_BAD_HIGH_SLOT:
1090 case -NFS4ERR_DEADSESSION:
1091 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1092 case -NFS4ERR_SEQ_FALSE_RETRY:
1093 case -NFS4ERR_SEQ_MISORDERED:
1094 dprintk("%s ERROR %d, Reset session. Exchangeid "
1095 "flags 0x%x\n", __func__, task->tk_status,
1096 clp->cl_exchange_flags);
1097 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1098 break;
1099 case -NFS4ERR_DELAY:
1100 case -NFS4ERR_GRACE:
1101 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1102 break;
1103 case -NFS4ERR_RETRY_UNCACHED_REP:
1104 break;
1105 /* Invalidate Layout errors */
1106 case -NFS4ERR_PNFS_NO_LAYOUT:
1107 case -ESTALE: /* mapped NFS4ERR_STALE */
1108 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1109 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1110 case -NFS4ERR_FHEXPIRED:
1111 case -NFS4ERR_WRONG_TYPE:
1112 dprintk("%s Invalid layout error %d\n", __func__,
1113 task->tk_status);
1114 /*
1115 * Destroy layout so new i/o will get a new layout.
1116 * Layout will not be destroyed until all current lseg
1117 * references are put. Mark layout as invalid to resend failed
1118 * i/o and all i/o waiting on the slot table to the MDS until
1119 * layout is destroyed and a new valid layout is obtained.
1120 */
1121 pnfs_destroy_layout(NFS_I(inode));
1122 rpc_wake_up(&tbl->slot_tbl_waitq);
1123 goto reset;
1124 /* RPC connection errors */
1125 case -ECONNREFUSED:
1126 case -EHOSTDOWN:
1127 case -EHOSTUNREACH:
1128 case -ENETUNREACH:
1129 case -EIO:
1130 case -ETIMEDOUT:
1131 case -EPIPE:
1132 dprintk("%s DS connection error %d\n", __func__,
1133 task->tk_status);
1c48cee8
WAA		 1134 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1135 &devid->deviceid);
d67ae825 1136 rpc_wake_up(&tbl->slot_tbl_waitq);
df561f66 1137 fallthrough;
d67ae825 1138 default:
3b13b4b3 1139 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1140 return -NFS4ERR_RESET_TO_PNFS;
1141reset:
1142 dprintk("%s Retry through MDS. Error %d\n", __func__,
1143 task->tk_status);
1144 return -NFS4ERR_RESET_TO_MDS;
1145 }
d67ae825
TH		 1146 task->tk_status = 0;
1147 return -EAGAIN;
d67ae825
TH		 1148}
1149
1150/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1151static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1152 struct pnfs_layout_segment *lseg,
b9df46d0 1153 u32 idx)
d67ae825
TH		 1154{
1155 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1156
90816d1d
TM		 1157 switch (task->tk_status) {
1158 /* File access problems. Don't mark the device as unavailable */
1159 case -EACCES:
1160 case -ESTALE:
1161 case -EISDIR:
1162 case -EBADHANDLE:
1163 case -ELOOP:
1164 case -ENOSPC:
1165 break;
1166 case -EJUKEBOX:
1167 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1168 goto out_retry;
1169 default:
d67ae825
TH		 1170 dprintk("%s DS connection error %d\n", __func__,
1171 task->tk_status);
1c48cee8
WAA		 1172 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1173 &devid->deviceid);
d67ae825 1174 }
90816d1d
TM		 1175 /* FIXME: Need to prevent infinite looping here. */
1176 return -NFS4ERR_RESET_TO_PNFS;
1177out_retry:
d67ae825 1178 task->tk_status = 0;
7eeea167 1179 rpc_restart_call_prepare(task);
d67ae825
TH		 1180 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1181 return -EAGAIN;
1182}
1183
1184static int ff_layout_async_handle_error(struct rpc_task *task,
1185 struct nfs4_state *state,
1186 struct nfs_client *clp,
1187 struct pnfs_layout_segment *lseg,
b9df46d0 1188 u32 idx)
d67ae825
TH		 1189{
1190 int vers = clp->cl_nfs_mod->rpc_vers->number;
1191
76c66905
TM		 1192 if (task->tk_status >= 0) {
1193 ff_layout_mark_ds_reachable(lseg, idx);
df3ab232 1194 return 0;
76c66905 1195 }
df3ab232
TM		 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,
b9df46d0 1215 u32 idx, u64 offset, u64 length,
088f3e68 1216 u32 *op_status, int opnum, int error)
d67ae825
TH		 1217{
1218 struct nfs4_ff_layout_mirror *mirror;
088f3e68 1219 u32 status = *op_status;
d67ae825
TH		 1220 int err;
1221
dd52128a
TM		 1222 if (status == 0) {
1223 switch (error) {
1224 case -ETIMEDOUT:
1225 case -EPFNOSUPPORT:
1226 case -EPROTONOSUPPORT:
1227 case -EOPNOTSUPP:
1228 case -ECONNREFUSED:
1229 case -ECONNRESET:
1230 case -EHOSTDOWN:
1231 case -EHOSTUNREACH:
1232 case -ENETUNREACH:
1233 case -EADDRINUSE:
1234 case -ENOBUFS:
1235 case -EPIPE:
1236 case -EPERM:
088f3e68 1237 *op_status = status = NFS4ERR_NXIO;
dd52128a
TM		 1238 break;
1239 case -EACCES:
088f3e68 1240 *op_status = status = NFS4ERR_ACCESS;
dd52128a
TM		 1241 break;
1242 default:
1243 return;
1244 }
1245 }
1246
194a0dc8
TM		 1247 mirror = FF_LAYOUT_COMP(lseg, idx);
1248 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1249 mirror, offset, length, status, opnum,
1250 GFP_NOIO);
1251
c22eeb86
PT		 1252 switch (status) {
1253 case NFS4ERR_DELAY:
1254 case NFS4ERR_GRACE:
c22eeb86 1255 break;
194a0dc8
TM		 1256 case NFS4ERR_NXIO:
1257 ff_layout_mark_ds_unreachable(lseg, idx);
563c53e7
TM		 1258 /*
1259 * Don't return the layout if this is a read and we still
1260 * have layouts to try
1261 */
1262 if (opnum == OP_READ)
1263 break;
df561f66 1264 fallthrough;
194a0dc8
TM		 1265 default:
1266 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1267 lseg);
c22eeb86
PT		 1268 }
1269
d67ae825
TH		 1270 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1271}
1272
1273/* NFS_PROTO call done callback routines */
d67ae825
TH		 1274static int ff_layout_read_done_cb(struct rpc_task *task,
1275 struct nfs_pgio_header *hdr)
1276{
d67ae825
TH		 1277 int err;
1278
088f3e68 1279 if (task->tk_status < 0) {
d67ae825
TH		 1280 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1281 hdr->args.offset, hdr->args.count,
088f3e68 1282 &hdr->res.op_status, OP_READ,
dd52128a 1283 task->tk_status);
088f3e68
TM		 1284 trace_ff_layout_read_error(hdr);
1285 }
1286
d67ae825
TH		 1287 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1288 hdr->ds_clp, hdr->lseg,
1289 hdr->pgio_mirror_idx);
1290
0722dc9f 1291 trace_nfs4_pnfs_read(hdr, err);
42f86b44
TM		 1292 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1293 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1294 switch (err) {
1295 case -NFS4ERR_RESET_TO_PNFS:
42f86b44 1296 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
d67ae825
TH		 1297 return task->tk_status;
1298 case -NFS4ERR_RESET_TO_MDS:
42f86b44 1299 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1300 return task->tk_status;
1301 case -EAGAIN:
13544412 1302 goto out_eagain;
d67ae825
TH		 1303 }
1304
1305 return 0;
13544412
TM		 1306out_eagain:
1307 rpc_restart_call_prepare(task);
1308 return -EAGAIN;
d67ae825
TH		 1309}
1310
c0f5f505
TM		 1311static bool
1312ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1313{
1314 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1315}
1316
d67ae825
TH		 1317/*
1318 * We reference the rpc_cred of the first WRITE that triggers the need for
1319 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1320 * rfc5661 is not clear about which credential should be used.
1321 *
1322 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1323 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1324 * we always send layoutcommit after DS writes.
1325 */
1326static void
bc28e1c2
TM		 1327ff_layout_set_layoutcommit(struct inode *inode,
1328 struct pnfs_layout_segment *lseg,
1329 loff_t end_offset)
d67ae825 1330{
bc28e1c2 1331 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1332 return;
1333
bc28e1c2
TM		 1334 pnfs_set_layoutcommit(inode, lseg, end_offset);
1335 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1336 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1337}
1338
37e9ed22
TM		 1339static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1340 struct nfs_pgio_header *hdr)
d67ae825 1341{
37e9ed22
TM		 1342 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1343 return;
0b7baf94 1344 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1345 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1346 hdr->args.count,
1347 task->tk_start);
37e9ed22
TM		 1348}
1349
1350static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1351 struct nfs_pgio_header *hdr)
1352{
1353 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1354 return;
1355 nfs4_ff_layout_stat_io_end_read(task,
1356 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1357 hdr->args.count,
1358 hdr->res.count);
056f9ad6 1359 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1360}
abcb7bfc 1361
37e9ed22
TM		 1362static int ff_layout_read_prepare_common(struct rpc_task *task,
1363 struct nfs_pgio_header *hdr)
1364{
d67ae825
TH		 1365 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1366 rpc_exit(task, -EIO);
1367 return -EIO;
1368 }
d67ae825 1369
37e9ed22 1370 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1371 return 0;
1372}
1373
1374/*
1375 * Call ops for the async read/write cases
1376 * In the case of dense layouts, the offset needs to be reset to its
1377 * original value.
1378 */
1379static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1380{
1381 struct nfs_pgio_header *hdr = data;
1382
1383 if (ff_layout_read_prepare_common(task, hdr))
1384 return;
1385
1386 rpc_call_start(task);
1387}
1388
d67ae825
TH		 1389static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1390{
1391 struct nfs_pgio_header *hdr = data;
1392
6de7e12f
AS		 1393 if (nfs4_setup_sequence(hdr->ds_clp,
1394 &hdr->args.seq_args,
1395 &hdr->res.seq_res,
1396 task))
d67ae825
TH		 1397 return;
1398
bb21ce0a 1399 ff_layout_read_prepare_common(task, hdr);
d67ae825
TH		 1400}
1401
1402static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1403{
1404 struct nfs_pgio_header *hdr = data;
1405
1406 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1407
1408 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1409 task->tk_status == 0) {
1410 nfs4_sequence_done(task, &hdr->res.seq_res);
1411 return;
1412 }
1413
1414 /* Note this may cause RPC to be resent */
1415 hdr->mds_ops->rpc_call_done(task, hdr);
1416}
1417
1418static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1419{
1420 struct nfs_pgio_header *hdr = data;
1421
37e9ed22 1422 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1423 rpc_count_iostats_metrics(task,
1424 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1425}
1426
4d0ac221
TM		 1427static void ff_layout_read_release(void *data)
1428{
1429 struct nfs_pgio_header *hdr = data;
1430
1431 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
563c53e7
TM		 1432 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1433 ff_layout_resend_pnfs_read(hdr);
1434 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
42f86b44 1435 ff_layout_reset_read(hdr);
4d0ac221
TM		 1436 pnfs_generic_rw_release(data);
1437}
1438
1439
d67ae825
TH		 1440static int ff_layout_write_done_cb(struct rpc_task *task,
1441 struct nfs_pgio_header *hdr)
1442{
2e18d4d8 1443 loff_t end_offs = 0;
d67ae825
TH		 1444 int err;
1445
088f3e68 1446 if (task->tk_status < 0) {
d67ae825
TH		 1447 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1448 hdr->args.offset, hdr->args.count,
088f3e68 1449 &hdr->res.op_status, OP_WRITE,
dd52128a 1450 task->tk_status);
088f3e68
TM		 1451 trace_ff_layout_write_error(hdr);
1452 }
1453
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
0722dc9f 1458 trace_nfs4_pnfs_write(hdr, err);
7b0df92a
TM		 1459 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1460 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1461 switch (err) {
1462 case -NFS4ERR_RESET_TO_PNFS:
7b0df92a 1463 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
7cc8c5cd 1464 return task->tk_status;
d67ae825 1465 case -NFS4ERR_RESET_TO_MDS:
7b0df92a 1466 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1467 return task->tk_status;
1468 case -EAGAIN:
d67ae825
TH		 1469 return -EAGAIN;
1470 }
1471
1472 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1473 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1474 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1475
1476 /* Note: if the write is unstable, don't set end_offs until commit */
1477 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1478
54204010
PT		 1479 /* zero out fattr since we don't care DS attr at all */
1480 hdr->fattr.valid = 0;
69f230d9
PT		 1481 if (task->tk_status >= 0)
1482 nfs_writeback_update_inode(hdr);
1483
d67ae825
TH		 1484 return 0;
1485}
1486
1487static int ff_layout_commit_done_cb(struct rpc_task *task,
1488 struct nfs_commit_data *data)
1489{
d67ae825
TH		 1490 int err;
1491
088f3e68 1492 if (task->tk_status < 0) {
d67ae825
TH		 1493 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1494 data->args.offset, data->args.count,
088f3e68 1495 &data->res.op_status, OP_COMMIT,
dd52128a 1496 task->tk_status);
088f3e68
TM		 1497 trace_ff_layout_commit_error(data);
1498 }
1499
d67ae825
TH		 1500 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1501 data->lseg, data->ds_commit_index);
1502
0722dc9f 1503 trace_nfs4_pnfs_commit_ds(data, err);
d67ae825
TH		 1504 switch (err) {
1505 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1506 pnfs_generic_prepare_to_resend_writes(data);
1507 return -EAGAIN;
d67ae825 1508 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1509 pnfs_generic_prepare_to_resend_writes(data);
1510 return -EAGAIN;
1511 case -EAGAIN:
1512 rpc_restart_call_prepare(task);
1513 return -EAGAIN;
1514 }
1515
bc28e1c2 1516 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1517
1518 return 0;
1519}
1520
37e9ed22
TM		 1521static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1522 struct nfs_pgio_header *hdr)
d67ae825 1523{
37e9ed22
TM		 1524 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1525 return;
0b7baf94 1526 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1527 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1528 hdr->args.count,
1529 task->tk_start);
37e9ed22
TM		 1530}
1531
1532static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1533 struct nfs_pgio_header *hdr)
1534{
1535 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1536 return;
1537 nfs4_ff_layout_stat_io_end_write(task,
1538 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1539 hdr->args.count, hdr->res.count,
1540 hdr->res.verf->committed);
056f9ad6 1541 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1542}
abcb7bfc 1543
37e9ed22
TM		 1544static int ff_layout_write_prepare_common(struct rpc_task *task,
1545 struct nfs_pgio_header *hdr)
1546{
d67ae825
TH		 1547 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1548 rpc_exit(task, -EIO);
1549 return -EIO;
1550 }
1551
37e9ed22 1552 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1553 return 0;
1554}
1555
1556static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1557{
1558 struct nfs_pgio_header *hdr = data;
1559
1560 if (ff_layout_write_prepare_common(task, hdr))
1561 return;
1562
1563 rpc_call_start(task);
1564}
1565
1566static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1567{
1568 struct nfs_pgio_header *hdr = data;
1569
6de7e12f
AS		 1570 if (nfs4_setup_sequence(hdr->ds_clp,
1571 &hdr->args.seq_args,
1572 &hdr->res.seq_res,
1573 task))
d67ae825
TH		 1574 return;
1575
bb21ce0a 1576 ff_layout_write_prepare_common(task, hdr);
d67ae825
TH		 1577}
1578
1579static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1580{
1581 struct nfs_pgio_header *hdr = data;
1582
1583 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1584 task->tk_status == 0) {
1585 nfs4_sequence_done(task, &hdr->res.seq_res);
1586 return;
1587 }
1588
1589 /* Note this may cause RPC to be resent */
1590 hdr->mds_ops->rpc_call_done(task, hdr);
1591}
1592
1593static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1594{
1595 struct nfs_pgio_header *hdr = data;
1596
37e9ed22 1597 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1598 rpc_count_iostats_metrics(task,
1599 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1600}
1601
4d0ac221
TM		 1602static void ff_layout_write_release(void *data)
1603{
1604 struct nfs_pgio_header *hdr = data;
1605
1606 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
f0922a6c
TM		 1607 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1608 ff_layout_send_layouterror(hdr->lseg);
7b0df92a 1609 ff_layout_reset_write(hdr, true);
f0922a6c 1610 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
7b0df92a 1611 ff_layout_reset_write(hdr, false);
4d0ac221
TM		 1612 pnfs_generic_rw_release(data);
1613}
1614
37e9ed22 1615static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1616 struct nfs_commit_data *cdata)
1617{
37e9ed22
TM		 1618 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1619 return;
0b7baf94 1620 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1621 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1622 0, task->tk_start);
abcb7bfc
TM		 1623}
1624
37e9ed22
TM		 1625static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1626 struct nfs_commit_data *cdata)
1627{
1628 struct nfs_page *req;
1629 __u64 count = 0;
1630
1631 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1632 return;
1633
1634 if (task->tk_status == 0) {
1635 list_for_each_entry(req, &cdata->pages, wb_list)
1636 count += req->wb_bytes;
1637 }
1638 nfs4_ff_layout_stat_io_end_write(task,
1639 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1640 count, count, NFS_FILE_SYNC);
056f9ad6 1641 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
37e9ed22
TM		 1642}
1643
1644static void ff_layout_commit_prepare_common(struct rpc_task *task,
1645 struct nfs_commit_data *cdata)
1646{
1647 ff_layout_commit_record_layoutstats_start(task, cdata);
1648}
1649
d67ae825
TH		 1650static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1651{
abcb7bfc 1652 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1653 rpc_call_start(task);
1654}
1655
1656static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1657{
1658 struct nfs_commit_data *wdata = data;
1659
6de7e12f
AS		 1660 if (nfs4_setup_sequence(wdata->ds_clp,
1661 &wdata->args.seq_args,
1662 &wdata->res.seq_res,
1663 task))
abcb7bfc
TM		 1664 return;
1665 ff_layout_commit_prepare_common(task, data);
1666}
1667
1668static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1669{
1670 pnfs_generic_write_commit_done(task, data);
1671}
1672
1673static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1674{
1675 struct nfs_commit_data *cdata = data;
abcb7bfc 1676
37e9ed22 1677 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1678 rpc_count_iostats_metrics(task,
1679 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1680}
1681
4d0ac221
TM		 1682static void ff_layout_commit_release(void *data)
1683{
1684 struct nfs_commit_data *cdata = data;
1685
1686 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1687 pnfs_generic_commit_release(data);
1688}
1689
d67ae825
TH		 1690static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1691 .rpc_call_prepare = ff_layout_read_prepare_v3,
1692 .rpc_call_done = ff_layout_read_call_done,
1693 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1694 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1695};
1696
1697static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1698 .rpc_call_prepare = ff_layout_read_prepare_v4,
1699 .rpc_call_done = ff_layout_read_call_done,
1700 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1701 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1702};
1703
1704static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1705 .rpc_call_prepare = ff_layout_write_prepare_v3,
1706 .rpc_call_done = ff_layout_write_call_done,
1707 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1708 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1709};
1710
1711static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1712 .rpc_call_prepare = ff_layout_write_prepare_v4,
1713 .rpc_call_done = ff_layout_write_call_done,
1714 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1715 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1716};
1717
1718static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1719 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1720 .rpc_call_done = ff_layout_commit_done,
d67ae825 1721 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1722 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1723};
1724
1725static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1726 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1727 .rpc_call_done = ff_layout_commit_done,
d67ae825 1728 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1729 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1730};
1731
1732static enum pnfs_try_status
1733ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1734{
1735 struct pnfs_layout_segment *lseg = hdr->lseg;
1736 struct nfs4_pnfs_ds *ds;
1737 struct rpc_clnt *ds_clnt;
2444ff27 1738 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1739 const struct cred *ds_cred;
d67ae825
TH		 1740 loff_t offset = hdr->args.offset;
1741 u32 idx = hdr->pgio_mirror_idx;
1742 int vers;
1743 struct nfs_fh *fh;
1744
5b5e0928 1745 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
d67ae825
TH		 1746 __func__, hdr->inode->i_ino,
1747 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1748
2444ff27
TM		 1749 mirror = FF_LAYOUT_COMP(lseg, idx);
1750 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
d67ae825
TH		 1751 if (!ds)
1752 goto out_failed;
1753
561d6f8a 1754 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1755 hdr->inode);
1756 if (IS_ERR(ds_clnt))
1757 goto out_failed;
1758
312cd4cb 1759 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
57f3f4c0 1760 if (!ds_cred)
d67ae825
TH		 1761 goto out_failed;
1762
626d48b1 1763 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825
TH		 1764
1765 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
212bf41d 1766 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
d67ae825 1767
75bf47eb 1768 hdr->pgio_done_cb = ff_layout_read_done_cb;
212bf41d 1769 refcount_inc(&ds->ds_clp->cl_count);
d67ae825 1770 hdr->ds_clp = ds->ds_clp;
749da527 1771 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1772 if (fh)
1773 hdr->args.fh = fh;
bb21ce0a 1774
4cbc8a57 1775 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
bb21ce0a 1776
d67ae825
TH		 1777 /*
1778 * Note that if we ever decide to split across DSes,
1779 * then we may need to handle dense-like offsets.
1780 */
1781 hdr->args.offset = offset;
1782 hdr->mds_offset = offset;
1783
1784 /* Perform an asynchronous read to ds */
1785 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1786 vers == 3 ? &ff_layout_read_call_ops_v3 :
1787 &ff_layout_read_call_ops_v4,
1788 0, RPC_TASK_SOFTCONN);
a52458b4 1789 put_cred(ds_cred);
d67ae825
TH		 1790 return PNFS_ATTEMPTED;
1791
1792out_failed:
3b13b4b3 1793 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825 1794 return PNFS_TRY_AGAIN;
d5b9216f
TM		 1795 trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1796 hdr->args.offset, hdr->args.count,
1797 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
d67ae825
TH		 1798 return PNFS_NOT_ATTEMPTED;
1799}
1800
1801/* Perform async writes. */
1802static enum pnfs_try_status
1803ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1804{
1805 struct pnfs_layout_segment *lseg = hdr->lseg;
1806 struct nfs4_pnfs_ds *ds;
1807 struct rpc_clnt *ds_clnt;
2444ff27 1808 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1809 const struct cred *ds_cred;
d67ae825
TH		 1810 loff_t offset = hdr->args.offset;
1811 int vers;
1812 struct nfs_fh *fh;
b9df46d0 1813 u32 idx = hdr->pgio_mirror_idx;
d67ae825 1814
2444ff27
TM		 1815 mirror = FF_LAYOUT_COMP(lseg, idx);
1816 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825 1817 if (!ds)
37f8aa16 1818 goto out_failed;
d67ae825 1819
561d6f8a 1820 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1821 hdr->inode);
1822 if (IS_ERR(ds_clnt))
37f8aa16 1823 goto out_failed;
d67ae825 1824
312cd4cb 1825 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
57f3f4c0 1826 if (!ds_cred)
37f8aa16 1827 goto out_failed;
d67ae825 1828
626d48b1 1829 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825 1830
5b5e0928 1831 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
d67ae825 1832 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
212bf41d 1833 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1834 vers);
1835
1836 hdr->pgio_done_cb = ff_layout_write_done_cb;
212bf41d 1837 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1838 hdr->ds_clp = ds->ds_clp;
1839 hdr->ds_commit_idx = idx;
749da527 1840 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1841 if (fh)
1842 hdr->args.fh = fh;
1843
4cbc8a57 1844 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
bb21ce0a 1845
d67ae825
TH		 1846 /*
1847 * Note that if we ever decide to split across DSes,
1848 * then we may need to handle dense-like offsets.
1849 */
1850 hdr->args.offset = offset;
1851
1852 /* Perform an asynchronous write */
1853 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1854 vers == 3 ? &ff_layout_write_call_ops_v3 :
1855 &ff_layout_write_call_ops_v4,
1856 sync, RPC_TASK_SOFTCONN);
a52458b4 1857 put_cred(ds_cred);
d67ae825 1858 return PNFS_ATTEMPTED;
37f8aa16
TM		 1859
1860out_failed:
1861 if (ff_layout_avoid_mds_available_ds(lseg))
1862 return PNFS_TRY_AGAIN;
d5b9216f
TM		 1863 trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1864 hdr->args.offset, hdr->args.count,
1865 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
37f8aa16 1866 return PNFS_NOT_ATTEMPTED;
d67ae825
TH		 1867}
1868
d67ae825
TH		 1869static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1870{
1871 return i;
1872}
1873
1874static struct nfs_fh *
1875select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1876{
1877 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1878
1879 /* FIXME: Assume that there is only one NFS version available
1880 * for the DS.
1881 */
1882 return &flseg->mirror_array[i]->fh_versions[0];
1883}
1884
1885static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1886{
1887 struct pnfs_layout_segment *lseg = data->lseg;
1888 struct nfs4_pnfs_ds *ds;
1889 struct rpc_clnt *ds_clnt;
2444ff27 1890 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1891 const struct cred *ds_cred;
d67ae825 1892 u32 idx;
57f3f4c0 1893 int vers, ret;
d67ae825
TH		 1894 struct nfs_fh *fh;
1895
4b75053e
TM		 1896 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1897 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1898 goto out_err;
1899
d67ae825 1900 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
2444ff27
TM		 1901 mirror = FF_LAYOUT_COMP(lseg, idx);
1902 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825
TH		 1903 if (!ds)
1904 goto out_err;
1905
561d6f8a 1906 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1907 data->inode);
1908 if (IS_ERR(ds_clnt))
1909 goto out_err;
1910
312cd4cb 1911 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
57f3f4c0 1912 if (!ds_cred)
d67ae825
TH		 1913 goto out_err;
1914
626d48b1 1915 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825
TH		 1916
1917 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
212bf41d 1918 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1919 vers);
1920 data->commit_done_cb = ff_layout_commit_done_cb;
1921 data->cred = ds_cred;
212bf41d 1922 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1923 data->ds_clp = ds->ds_clp;
1924 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1925 if (fh)
1926 data->args.fh = fh;
abcb7bfc 1927
57f3f4c0 1928 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1929 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1930 &ff_layout_commit_call_ops_v4,
1931 how, RPC_TASK_SOFTCONN);
a52458b4 1932 put_cred(ds_cred);
57f3f4c0 1933 return ret;
d67ae825
TH		 1934out_err:
1935 pnfs_generic_prepare_to_resend_writes(data);
1936 pnfs_generic_commit_release(data);
1937 return -EAGAIN;
1938}
1939
1940static int
1941ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1942 int how, struct nfs_commit_info *cinfo)
1943{
1944 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1945 ff_layout_initiate_commit);
1946}
1947
1948static struct pnfs_ds_commit_info *
1949ff_layout_get_ds_info(struct inode *inode)
1950{
1951 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1952
1953 if (layout == NULL)
1954 return NULL;
1955
1956 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1957}
1958
ba827c9a
TM		 1959static void
1960ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1961 struct pnfs_layout_segment *lseg)
1962{
1963 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1964 struct inode *inode = lseg->pls_layout->plh_inode;
1965 struct pnfs_commit_array *array, *new;
1966
1967 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt, GFP_NOIO);
1968 if (new) {
1969 spin_lock(&inode->i_lock);
1970 array = pnfs_add_commit_array(fl_cinfo, new, lseg);
1971 spin_unlock(&inode->i_lock);
1972 if (array != new)
1973 pnfs_free_commit_array(new);
1974 }
1975}
1976
a9901899
TM		 1977static void
1978ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1979 struct inode *inode)
1980{
1981 spin_lock(&inode->i_lock);
1982 pnfs_generic_ds_cinfo_destroy(fl_cinfo);
1983 spin_unlock(&inode->i_lock);
1984}
1985
d67ae825 1986static void
fc87701b 1987ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1988{
1989 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1990 id_node));
1991}
1992
5ba6a09e 1993static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
5b9b3c85
TM		 1994 const struct nfs4_layoutreturn_args *args,
1995 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1996{
d67ae825 1997 __be32 *start;
d67ae825
TH		 1998
1999 start = xdr_reserve_space(xdr, 4);
2000 if (unlikely(!start))
2001 return -E2BIG;
2002
5b9b3c85 2003 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 2004 /* This assume we always return _ALL_ layouts */
5b9b3c85 2005 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 2006}
2007
230bc962
TM		 2008static void
2009encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2010{
ab6e9aaf 2011 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
230bc962
TM		 2012}
2013
2014static void
2015ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2016 const nfs4_stateid *stateid,
2017 const struct nfs42_layoutstat_devinfo *devinfo)
2018{
2019 __be32 *p;
2020
2021 p = xdr_reserve_space(xdr, 8 + 8);
2022 p = xdr_encode_hyper(p, devinfo->offset);
2023 p = xdr_encode_hyper(p, devinfo->length);
2024 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2025 p = xdr_reserve_space(xdr, 4*8);
2026 p = xdr_encode_hyper(p, devinfo->read_count);
2027 p = xdr_encode_hyper(p, devinfo->read_bytes);
2028 p = xdr_encode_hyper(p, devinfo->write_count);
2029 p = xdr_encode_hyper(p, devinfo->write_bytes);
2030 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2031}
2032
2033static void
2034ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2035 const nfs4_stateid *stateid,
2036 const struct nfs42_layoutstat_devinfo *devinfo)
2037{
2038 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2039 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2040 devinfo->ld_private.data);
2041}
2042
d67ae825 2043/* report nothing for now */
230bc962
TM		 2044static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2045 const struct nfs4_layoutreturn_args *args,
2046 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 2047{
2048 __be32 *p;
230bc962 2049 int i;
d67ae825
TH		 2050
2051 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 2052 *p = cpu_to_be32(ff_args->num_dev);
2053 for (i = 0; i < ff_args->num_dev; i++)
2054 ff_layout_encode_ff_iostat(xdr,
2055 &args->layout->plh_stateid,
2056 &ff_args->devinfo[i]);
2057}
2058
2059static void
2060ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2061 unsigned int num_entries)
2062{
2063 unsigned int i;
2064
2065 for (i = 0; i < num_entries; i++) {
2066 if (!devinfo[i].ld_private.ops)
2067 continue;
2068 if (!devinfo[i].ld_private.ops->free)
2069 continue;
2070 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2071 }
d67ae825
TH		 2072}
2073
2074static struct nfs4_deviceid_node *
2075ff_layout_alloc_deviceid_node(struct nfs_server *server,
2076 struct pnfs_device *pdev, gfp_t gfp_flags)
2077{
2078 struct nfs4_ff_layout_ds *dsaddr;
2079
2080 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2081 if (!dsaddr)
2082 return NULL;
2083 return &dsaddr->id_node;
2084}
2085
2086static void
94e5c571 2087ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2088 const void *voidargs,
2089 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2090{
5b9b3c85 2091 const struct nfs4_layoutreturn_args *args = voidargs;
5ba6a09e 2092 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
d9152114
TM		 2093 struct xdr_buf tmp_buf = {
2094 .head = {
2095 [0] = {
2096 .iov_base = page_address(ff_args->pages[0]),
2097 },
2098 },
2099 .buflen = PAGE_SIZE,
2100 };
2101 struct xdr_stream tmp_xdr;
d67ae825
TH		 2102 __be32 *start;
2103
2104 dprintk("%s: Begin\n", __func__);
d67ae825 2105
0ccc61b1 2106 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
d9152114
TM		 2107
2108 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2109 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2110
2111 start = xdr_reserve_space(xdr, 4);
2112 *start = cpu_to_be32(tmp_buf.len);
2113 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
082fa37d 2114
d67ae825
TH		 2115 dprintk("%s: Return\n", __func__);
2116}
2117
5b9b3c85
TM		 2118static void
2119ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2120{
2121 struct nfs4_flexfile_layoutreturn_args *ff_args;
2122
2123 if (!args->data)
2124 return;
2125 ff_args = args->data;
2126 args->data = NULL;
2127
2128 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2129 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85 2130
d9152114 2131 put_page(ff_args->pages[0]);
5b9b3c85
TM		 2132 kfree(ff_args);
2133}
2134
2e54b9b1 2135static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
5b9b3c85
TM		 2136 .encode = ff_layout_encode_layoutreturn,
2137 .free = ff_layout_free_layoutreturn,
2138};
2139
2140static int
2141ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2142{
2143 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2144 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85
TM		 2145
2146 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2147 if (!ff_args)
d9152114
TM		 2148 goto out_nomem;
2149 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2150 if (!ff_args->pages[0])
2151 goto out_nomem_free;
5b9b3c85
TM		 2152
2153 INIT_LIST_HEAD(&ff_args->errors);
2154 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2155 &args->range, &ff_args->errors,
2156 FF_LAYOUTRETURN_MAXERR);
2157
230bc962
TM		 2158 spin_lock(&args->inode->i_lock);
2159 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2160 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2161 spin_unlock(&args->inode->i_lock);
2162
5b9b3c85
TM		 2163 args->ld_private->ops = &layoutreturn_ops;
2164 args->ld_private->data = ff_args;
2165 return 0;
d9152114
TM		 2166out_nomem_free:
2167 kfree(ff_args);
2168out_nomem:
2169 return -ENOMEM;
5b9b3c85
TM		 2170}
2171
f0922a6c
TM		 2172#ifdef CONFIG_NFS_V4_2
2173void
2174ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2175{
2176 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2177 struct nfs42_layout_error *errors;
2178 LIST_HEAD(head);
2179
2180 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2181 return;
2182 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2183 if (list_empty(&head))
2184 return;
2185
2186 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX,
2187 sizeof(*errors), GFP_NOFS);
2188 if (errors != NULL) {
2189 const struct nfs4_ff_layout_ds_err *pos;
2190 size_t n = 0;
2191
2192 list_for_each_entry(pos, &head, list) {
2193 errors[n].offset = pos->offset;
2194 errors[n].length = pos->length;
2195 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2196 errors[n].errors[0].dev_id = pos->deviceid;
2197 errors[n].errors[0].status = pos->status;
2198 errors[n].errors[0].opnum = pos->opnum;
2199 n++;
2200 if (!list_is_last(&pos->list, &head) &&
2201 n < NFS42_LAYOUTERROR_MAX)
2202 continue;
2203 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2204 break;
2205 n = 0;
2206 }
2207 kfree(errors);
2208 }
2209 ff_layout_free_ds_ioerr(&head);
2210}
2211#else
2212void
2213ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2214{
2215}
2216#endif
2217
27c43064
PT		 2218static int
2219ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2220{
2221 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2222
2223 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2224}
2225
2226static size_t
2227ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2228 const int buflen)
2229{
2230 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2231 const struct in6_addr *addr = &sin6->sin6_addr;
2232
2233 /*
2234 * RFC 4291, Section 2.2.2
2235 *
2236 * Shorthanded ANY address
2237 */
2238 if (ipv6_addr_any(addr))
2239 return snprintf(buf, buflen, "::");
2240
2241 /*
2242 * RFC 4291, Section 2.2.2
2243 *
2244 * Shorthanded loopback address
2245 */
2246 if (ipv6_addr_loopback(addr))
2247 return snprintf(buf, buflen, "::1");
2248
2249 /*
2250 * RFC 4291, Section 2.2.3
2251 *
2252 * Special presentation address format for mapped v4
2253 * addresses.
2254 */
2255 if (ipv6_addr_v4mapped(addr))
2256 return snprintf(buf, buflen, "::ffff:%pI4",
2257 &addr->s6_addr32[3]);
2258
2259 /*
2260 * RFC 4291, Section 2.2.1
2261 */
2262 return snprintf(buf, buflen, "%pI6c", addr);
2263}
2264
2265/* Derived from rpc_sockaddr2uaddr */
2266static void
2267ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2268{
2269 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2270 char portbuf[RPCBIND_MAXUADDRPLEN];
2271 char addrbuf[RPCBIND_MAXUADDRLEN];
2272 char *netid;
2273 unsigned short port;
2274 int len, netid_len;
2275 __be32 *p;
2276
2277 switch (sap->sa_family) {
2278 case AF_INET:
2279 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2280 return;
2281 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2282 netid = "tcp";
2283 netid_len = 3;
2284 break;
2285 case AF_INET6:
2286 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2287 return;
2288 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2289 netid = "tcp6";
2290 netid_len = 4;
2291 break;
2292 default:
2293 /* we only support tcp and tcp6 */
2294 WARN_ON_ONCE(1);
2295 return;
2296 }
2297
2298 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2299 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2300
2301 p = xdr_reserve_space(xdr, 4 + netid_len);
2302 xdr_encode_opaque(p, netid, netid_len);
2303
2304 p = xdr_reserve_space(xdr, 4 + len);
2305 xdr_encode_opaque(p, addrbuf, len);
2306}
2307
2308static void
2309ff_layout_encode_nfstime(struct xdr_stream *xdr,
2310 ktime_t t)
2311{
2312 struct timespec64 ts;
2313 __be32 *p;
2314
2315 p = xdr_reserve_space(xdr, 12);
2316 ts = ktime_to_timespec64(t);
2317 p = xdr_encode_hyper(p, ts.tv_sec);
2318 *p++ = cpu_to_be32(ts.tv_nsec);
2319}
2320
2321static void
2322ff_layout_encode_io_latency(struct xdr_stream *xdr,
2323 struct nfs4_ff_io_stat *stat)
2324{
2325 __be32 *p;
2326
2327 p = xdr_reserve_space(xdr, 5 * 8);
2328 p = xdr_encode_hyper(p, stat->ops_requested);
2329 p = xdr_encode_hyper(p, stat->bytes_requested);
2330 p = xdr_encode_hyper(p, stat->ops_completed);
2331 p = xdr_encode_hyper(p, stat->bytes_completed);
2332 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2333 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2334 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2335}
2336
2337static void
422c93c8
TM		 2338ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2339 const struct nfs42_layoutstat_devinfo *devinfo,
2340 struct nfs4_ff_layout_mirror *mirror)
27c43064 2341{
27c43064
PT		 2342 struct nfs4_pnfs_ds_addr *da;
2343 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2344 struct nfs_fh *fh = &mirror->fh_versions[0];
422c93c8 2345 __be32 *p;
27c43064
PT		 2346
2347 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2348 dprintk("%s: DS %s: encoding address %s\n",
2349 __func__, ds->ds_remotestr, da->da_remotestr);
27c43064
PT		 2350 /* netaddr4 */
2351 ff_layout_encode_netaddr(xdr, da);
2352 /* nfs_fh4 */
2353 p = xdr_reserve_space(xdr, 4 + fh->size);
2354 xdr_encode_opaque(p, fh->data, fh->size);
2355 /* ff_io_latency4 read */
2356 spin_lock(&mirror->lock);
2357 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2358 /* ff_io_latency4 write */
2359 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2360 spin_unlock(&mirror->lock);
2361 /* nfstime4 */
2362 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2363 /* bool */
2364 p = xdr_reserve_space(xdr, 4);
2365 *p = cpu_to_be32(false);
422c93c8
TM		 2366}
2367
2368static void
2369ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2370 const struct nfs4_xdr_opaque_data *opaque)
2371{
2372 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2373 struct nfs42_layoutstat_devinfo, ld_private);
2374 __be32 *start;
2375
2376 /* layoutupdate length */
2377 start = xdr_reserve_space(xdr, 4);
2378 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
27c43064
PT		 2379
2380 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2381}
2382
422c93c8
TM		 2383static void
2384ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2385{
2386 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2387
2388 ff_layout_put_mirror(mirror);
2389}
2390
2391static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2392 .encode = ff_layout_encode_layoutstats,
2393 .free = ff_layout_free_layoutstats,
2394};
2395
266d12d4 2396static int
08e2e5bc
TM		 2397ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2398 struct nfs42_layoutstat_devinfo *devinfo,
266d12d4 2399 int dev_limit)
ad4dc53e 2400{
266d12d4 2401 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2402 struct nfs4_ff_layout_mirror *mirror;
2403 struct nfs4_deviceid_node *dev;
266d12d4 2404 int i = 0;
ad4dc53e 2405
266d12d4
TM		 2406 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2407 if (i >= dev_limit)
ad4dc53e 2408 break;
65990d1a 2409 if (IS_ERR_OR_NULL(mirror->mirror_ds))
27c43064 2410 continue;
06946c6a
TM		 2411 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2412 continue;
266d12d4 2413 /* mirror refcount put in cleanup_layoutstats */
81a090b9 2414 if (!refcount_inc_not_zero(&mirror->ref))
266d12d4
TM		 2415 continue;
2416 dev = &mirror->mirror_ds->id_node;
ad4dc53e 2417 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2418 devinfo->offset = 0;
2419 devinfo->length = NFS4_MAX_UINT64;
2f8220c1 2420 spin_lock(&mirror->lock);
d099d7b8 2421 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2422 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2423 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e 2424 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2f8220c1 2425 spin_unlock(&mirror->lock);
ad4dc53e 2426 devinfo->layout_type = LAYOUT_FLEX_FILES;
422c93c8
TM		 2427 devinfo->ld_private.ops = &layoutstat_ops;
2428 devinfo->ld_private.data = mirror;
ad4dc53e 2429
08e2e5bc 2430 devinfo++;
266d12d4 2431 i++;
ad4dc53e 2432 }
266d12d4 2433 return i;
ad4dc53e
PT		 2434}
2435
2436static int
2437ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2438{
266d12d4 2439 struct nfs4_flexfile_layout *ff_layout;
08e2e5bc 2440 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
ad4dc53e 2441
ad4dc53e 2442 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
266d12d4 2443 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2444 if (!args->devinfo)
2445 return -ENOMEM;
2446
ad4dc53e 2447 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2448 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2449 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2450 &args->devinfo[0], dev_count);
ad4dc53e 2451 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2452 if (!args->num_dev) {
2453 kfree(args->devinfo);
2454 args->devinfo = NULL;
2455 return -ENOENT;
2456 }
ad4dc53e
PT		 2457
2458 return 0;
2459}
2460
76b2a303
TM		 2461static int
2462ff_layout_set_layoutdriver(struct nfs_server *server,
2463 const struct nfs_fh *dummy)
2464{
2465#if IS_ENABLED(CONFIG_NFS_V4_2)
2466 server->caps |= NFS_CAP_LAYOUTSTATS;
2467#endif
2468 return 0;
2469}
2470
9c455a8c
TM		 2471static const struct pnfs_commit_ops ff_layout_commit_ops = {
2472 .setup_ds_info = ff_layout_setup_ds_info,
2473 .release_ds_info = ff_layout_release_ds_info,
2474 .mark_request_commit = pnfs_layout_mark_request_commit,
2475 .clear_request_commit = pnfs_generic_clear_request_commit,
2476 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2477 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2478 .commit_pagelist = ff_layout_commit_pagelist,
2479};
2480
d67ae825
TH		 2481static struct pnfs_layoutdriver_type flexfilelayout_type = {
2482 .id = LAYOUT_FLEX_FILES,
2483 .name = "LAYOUT_FLEX_FILES",
2484 .owner = THIS_MODULE,
f86c3ac5 2485 .flags = PNFS_LAYOUTGET_ON_OPEN,
28ced9a8 2486 .max_layoutget_response = 4096, /* 1 page or so... */
76b2a303 2487 .set_layoutdriver = ff_layout_set_layoutdriver,
d67ae825
TH		 2488 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2489 .free_layout_hdr = ff_layout_free_layout_hdr,
2490 .alloc_lseg = ff_layout_alloc_lseg,
2491 .free_lseg = ff_layout_free_lseg,
0762ed2c 2492 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2493 .pg_read_ops = &ff_layout_pg_read_ops,
2494 .pg_write_ops = &ff_layout_pg_write_ops,
2495 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2496 .free_deviceid_node = ff_layout_free_deviceid_node,
d67ae825
TH		 2497 .read_pagelist = ff_layout_read_pagelist,
2498 .write_pagelist = ff_layout_write_pagelist,
2499 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2500 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2501 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2502 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2503};
2504
2505static int __init nfs4flexfilelayout_init(void)
2506{
2507 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2508 __func__);
2509 return pnfs_register_layoutdriver(&flexfilelayout_type);
2510}
2511
2512static void __exit nfs4flexfilelayout_exit(void)
2513{
2514 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2515 __func__);
2516 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2517}
2518
2519MODULE_ALIAS("nfs-layouttype4-4");
2520
2521MODULE_LICENSE("GPL");
2522MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2523
2524module_init(nfs4flexfilelayout_init);
2525module_exit(nfs4flexfilelayout_exit);
33344e0f
TM		 2526
2527module_param(io_maxretrans, ushort, 0644);
2528MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
2529 "retries an I/O request before returning an error. ");
Michael's Linux tree.