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[linux-block.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
TM		 717static void
718ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx)
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
727ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx)
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
TM		 736ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
737 int start_idx, int *best_idx,
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;
d67ae825
TH		 744 int idx;
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,
769 int start_idx, int *best_idx)
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,
776 int start_idx, int *best_idx)
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,
783 int start_idx, int *best_idx)
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
TM		 793static struct nfs4_pnfs_ds *
794ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, int *best_idx)
795{
796 struct pnfs_layout_segment *lseg = pgio->pg_lseg;
797 struct nfs4_pnfs_ds *ds;
798
799 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
800 best_idx);
801 if (ds || !pgio->pg_mirror_idx)
802 return ds;
803 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
804}
805
c7d73af2
TH		 806static void
807ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
808 struct nfs_page *req,
809 bool strict_iomode)
810{
c7d73af2
TH		 811 pnfs_put_lseg(pgio->pg_lseg);
812 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 813 nfs_req_openctx(req),
cbd7be43
TM		 814 req_offset(req),
815 req->wb_bytes,
c7d73af2
TH		 816 IOMODE_READ,
817 strict_iomode,
818 GFP_KERNEL);
819 if (IS_ERR(pgio->pg_lseg)) {
820 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
821 pgio->pg_lseg = NULL;
822 }
c7d73af2
TH		 823}
824
e1e54ab7
TM		 825static void
826ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
827 struct nfs_page *req)
828{
829 pnfs_generic_pg_check_layout(pgio);
830 pnfs_generic_pg_check_range(pgio, req);
831}
832
d67ae825
TH		 833static void
834ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
835 struct nfs_page *req)
836{
837 struct nfs_pgio_mirror *pgm;
838 struct nfs4_ff_layout_mirror *mirror;
839 struct nfs4_pnfs_ds *ds;
840 int ds_idx;
841
3dc14735 842retry:
e1e54ab7 843 ff_layout_pg_check_layout(pgio, req);
d67ae825 844 /* Use full layout for now */
1c1aeaf1 845 if (!pgio->pg_lseg) {
c7d73af2 846 ff_layout_pg_get_read(pgio, req, false);
1c1aeaf1
TM		 847 if (!pgio->pg_lseg)
848 goto out_nolseg;
849 }
850 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
c7d73af2 851 ff_layout_pg_get_read(pgio, req, true);
1c1aeaf1
TM		 852 if (!pgio->pg_lseg)
853 goto out_nolseg;
854 }
d67ae825 855
563c53e7 856 ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
446ca219 857 if (!ds) {
3dc14735 858 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 859 goto out_mds;
f97ff92b 860 pnfs_generic_pg_cleanup(pgio);
3dc14735
TM		 861 /* Sleep for 1 second before retrying */
862 ssleep(1);
863 goto retry;
446ca219
TH		 864 }
865
d67ae825
TH		 866 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
867
868 pgio->pg_mirror_idx = ds_idx;
869
870 /* read always uses only one mirror - idx 0 for pgio layer */
871 pgm = &pgio->pg_mirrors[0];
872 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
873
7af46292
TM		 874 if (NFS_SERVER(pgio->pg_inode)->flags &
875 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
876 pgio->pg_maxretrans = io_maxretrans;
d67ae825 877 return;
1c1aeaf1
TM		 878out_nolseg:
879 if (pgio->pg_error < 0)
880 return;
d67ae825 881out_mds:
d5b9216f
TM		 882 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
883 0, NFS4_MAX_UINT64, IOMODE_READ,
884 NFS_I(pgio->pg_inode)->layout,
885 pgio->pg_lseg);
7af46292 886 pgio->pg_maxretrans = 0;
d67ae825
TH		 887 nfs_pageio_reset_read_mds(pgio);
888}
889
890static void
891ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
892 struct nfs_page *req)
893{
894 struct nfs4_ff_layout_mirror *mirror;
895 struct nfs_pgio_mirror *pgm;
d67ae825
TH		 896 struct nfs4_pnfs_ds *ds;
897 int i;
d67ae825 898
3dc14735 899retry:
e1e54ab7 900 ff_layout_pg_check_layout(pgio, req);
d600ad1f 901 if (!pgio->pg_lseg) {
d67ae825 902 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 903 nfs_req_openctx(req),
cbd7be43
TM		 904 req_offset(req),
905 req->wb_bytes,
d67ae825 906 IOMODE_RW,
c7d73af2 907 false,
d67ae825 908 GFP_NOFS);
d600ad1f
PT		 909 if (IS_ERR(pgio->pg_lseg)) {
910 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
911 pgio->pg_lseg = NULL;
912 return;
913 }
914 }
d67ae825
TH		 915 /* If no lseg, fall back to write through mds */
916 if (pgio->pg_lseg == NULL)
917 goto out_mds;
918
d67ae825 919 /* Use a direct mapping of ds_idx to pgio mirror_idx */
8b040137
TM		 920 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
921 goto out_eagain;
d67ae825
TH		 922
923 for (i = 0; i < pgio->pg_mirror_count; i++) {
2444ff27 924 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
2444ff27 925 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
446ca219 926 if (!ds) {
3dc14735 927 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 928 goto out_mds;
f97ff92b 929 pnfs_generic_pg_cleanup(pgio);
3dc14735
TM		 930 /* Sleep for 1 second before retrying */
931 ssleep(1);
932 goto retry;
446ca219 933 }
d67ae825 934 pgm = &pgio->pg_mirrors[i];
d67ae825
TH		 935 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
936 }
937
7af46292
TM		 938 if (NFS_SERVER(pgio->pg_inode)->flags &
939 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
940 pgio->pg_maxretrans = io_maxretrans;
d67ae825 941 return;
8b040137
TM		 942out_eagain:
943 pnfs_generic_pg_cleanup(pgio);
944 pgio->pg_error = -EAGAIN;
945 return;
d67ae825 946out_mds:
d5b9216f
TM		 947 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
948 0, NFS4_MAX_UINT64, IOMODE_RW,
949 NFS_I(pgio->pg_inode)->layout,
950 pgio->pg_lseg);
7af46292 951 pgio->pg_maxretrans = 0;
d67ae825 952 nfs_pageio_reset_write_mds(pgio);
8b040137 953 pgio->pg_error = -EAGAIN;
d67ae825
TH		 954}
955
956static unsigned int
957ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
958 struct nfs_page *req)
959{
d600ad1f 960 if (!pgio->pg_lseg) {
d67ae825 961 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 962 nfs_req_openctx(req),
18eb87f4
TM		 963 req_offset(req),
964 req->wb_bytes,
d67ae825 965 IOMODE_RW,
c7d73af2 966 false,
d67ae825 967 GFP_NOFS);
d600ad1f
PT		 968 if (IS_ERR(pgio->pg_lseg)) {
969 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
970 pgio->pg_lseg = NULL;
971 goto out;
972 }
973 }
d67ae825
TH		 974 if (pgio->pg_lseg)
975 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
976
d5b9216f
TM		 977 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
978 0, NFS4_MAX_UINT64, IOMODE_RW,
979 NFS_I(pgio->pg_inode)->layout,
980 pgio->pg_lseg);
d67ae825 981 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 982 nfs_pageio_reset_write_mds(pgio);
d600ad1f 983out:
d67ae825
TH		 984 return 1;
985}
986
987static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
988 .pg_init = ff_layout_pg_init_read,
989 .pg_test = pnfs_generic_pg_test,
990 .pg_doio = pnfs_generic_pg_readpages,
991 .pg_cleanup = pnfs_generic_pg_cleanup,
992};
993
994static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
995 .pg_init = ff_layout_pg_init_write,
996 .pg_test = pnfs_generic_pg_test,
997 .pg_doio = pnfs_generic_pg_writepages,
998 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
999 .pg_cleanup = pnfs_generic_pg_cleanup,
1000};
1001
1002static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1003{
1004 struct rpc_task *task = &hdr->task;
1005
1006 pnfs_layoutcommit_inode(hdr->inode, false);
1007
1008 if (retry_pnfs) {
1009 dprintk("%s Reset task %5u for i/o through pNFS "
1010 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1011 hdr->task.tk_pid,
1012 hdr->inode->i_sb->s_id,
1013 (unsigned long long)NFS_FILEID(hdr->inode),
1014 hdr->args.count,
1015 (unsigned long long)hdr->args.offset);
1016
dc602dd7 1017 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1018 return;
1019 }
1020
1021 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1022 dprintk("%s Reset task %5u for i/o through MDS "
1023 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1024 hdr->task.tk_pid,
1025 hdr->inode->i_sb->s_id,
1026 (unsigned long long)NFS_FILEID(hdr->inode),
1027 hdr->args.count,
1028 (unsigned long long)hdr->args.offset);
1029
d5b9216f
TM		 1030 trace_pnfs_mds_fallback_write_done(hdr->inode,
1031 hdr->args.offset, hdr->args.count,
1032 IOMODE_RW, NFS_I(hdr->inode)->layout,
1033 hdr->lseg);
d67ae825
TH		 1034 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1035 }
1036}
1037
563c53e7
TM		 1038static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1039{
1040 u32 idx = hdr->pgio_mirror_idx + 1;
1041 int new_idx = 0;
1042
1043 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx + 1, &new_idx))
1044 ff_layout_send_layouterror(hdr->lseg);
1045 else
1046 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1047 pnfs_read_resend_pnfs(hdr, new_idx);
1048}
1049
d67ae825
TH		 1050static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1051{
1052 struct rpc_task *task = &hdr->task;
1053
1054 pnfs_layoutcommit_inode(hdr->inode, false);
563c53e7 1055 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
d67ae825
TH		 1056
1057 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1058 dprintk("%s Reset task %5u for i/o through MDS "
1059 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1060 hdr->task.tk_pid,
1061 hdr->inode->i_sb->s_id,
1062 (unsigned long long)NFS_FILEID(hdr->inode),
1063 hdr->args.count,
1064 (unsigned long long)hdr->args.offset);
1065
d5b9216f
TM		 1066 trace_pnfs_mds_fallback_read_done(hdr->inode,
1067 hdr->args.offset, hdr->args.count,
1068 IOMODE_READ, NFS_I(hdr->inode)->layout,
1069 hdr->lseg);
d67ae825
TH		 1070 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1071 }
1072}
1073
1074static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1075 struct nfs4_state *state,
1076 struct nfs_client *clp,
1077 struct pnfs_layout_segment *lseg,
1078 int idx)
1079{
1080 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1081 struct inode *inode = lo->plh_inode;
d67ae825 1082 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
d67ae825
TH		 1083 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1084
d67ae825 1085 switch (task->tk_status) {
d67ae825
TH		 1086 case -NFS4ERR_BADSESSION:
1087 case -NFS4ERR_BADSLOT:
1088 case -NFS4ERR_BAD_HIGH_SLOT:
1089 case -NFS4ERR_DEADSESSION:
1090 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1091 case -NFS4ERR_SEQ_FALSE_RETRY:
1092 case -NFS4ERR_SEQ_MISORDERED:
1093 dprintk("%s ERROR %d, Reset session. Exchangeid "
1094 "flags 0x%x\n", __func__, task->tk_status,
1095 clp->cl_exchange_flags);
1096 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1097 break;
1098 case -NFS4ERR_DELAY:
1099 case -NFS4ERR_GRACE:
1100 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1101 break;
1102 case -NFS4ERR_RETRY_UNCACHED_REP:
1103 break;
1104 /* Invalidate Layout errors */
1105 case -NFS4ERR_PNFS_NO_LAYOUT:
1106 case -ESTALE: /* mapped NFS4ERR_STALE */
1107 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1108 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1109 case -NFS4ERR_FHEXPIRED:
1110 case -NFS4ERR_WRONG_TYPE:
1111 dprintk("%s Invalid layout error %d\n", __func__,
1112 task->tk_status);
1113 /*
1114 * Destroy layout so new i/o will get a new layout.
1115 * Layout will not be destroyed until all current lseg
1116 * references are put. Mark layout as invalid to resend failed
1117 * i/o and all i/o waiting on the slot table to the MDS until
1118 * layout is destroyed and a new valid layout is obtained.
1119 */
1120 pnfs_destroy_layout(NFS_I(inode));
1121 rpc_wake_up(&tbl->slot_tbl_waitq);
1122 goto reset;
1123 /* RPC connection errors */
1124 case -ECONNREFUSED:
1125 case -EHOSTDOWN:
1126 case -EHOSTUNREACH:
1127 case -ENETUNREACH:
1128 case -EIO:
1129 case -ETIMEDOUT:
1130 case -EPIPE:
1131 dprintk("%s DS connection error %d\n", __func__,
1132 task->tk_status);
1c48cee8
WAA		 1133 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1134 &devid->deviceid);
d67ae825 1135 rpc_wake_up(&tbl->slot_tbl_waitq);
df561f66 1136 fallthrough;
d67ae825 1137 default:
3b13b4b3 1138 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1139 return -NFS4ERR_RESET_TO_PNFS;
1140reset:
1141 dprintk("%s Retry through MDS. Error %d\n", __func__,
1142 task->tk_status);
1143 return -NFS4ERR_RESET_TO_MDS;
1144 }
d67ae825
TH		 1145 task->tk_status = 0;
1146 return -EAGAIN;
d67ae825
TH		 1147}
1148
1149/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1150static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1151 struct pnfs_layout_segment *lseg,
1152 int idx)
1153{
1154 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1155
90816d1d
TM		 1156 switch (task->tk_status) {
1157 /* File access problems. Don't mark the device as unavailable */
1158 case -EACCES:
1159 case -ESTALE:
1160 case -EISDIR:
1161 case -EBADHANDLE:
1162 case -ELOOP:
1163 case -ENOSPC:
1164 break;
1165 case -EJUKEBOX:
1166 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1167 goto out_retry;
1168 default:
d67ae825
TH		 1169 dprintk("%s DS connection error %d\n", __func__,
1170 task->tk_status);
1c48cee8
WAA		 1171 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1172 &devid->deviceid);
d67ae825 1173 }
90816d1d
TM		 1174 /* FIXME: Need to prevent infinite looping here. */
1175 return -NFS4ERR_RESET_TO_PNFS;
1176out_retry:
d67ae825 1177 task->tk_status = 0;
7eeea167 1178 rpc_restart_call_prepare(task);
d67ae825
TH		 1179 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1180 return -EAGAIN;
1181}
1182
1183static int ff_layout_async_handle_error(struct rpc_task *task,
1184 struct nfs4_state *state,
1185 struct nfs_client *clp,
1186 struct pnfs_layout_segment *lseg,
1187 int idx)
1188{
1189 int vers = clp->cl_nfs_mod->rpc_vers->number;
1190
76c66905
TM		 1191 if (task->tk_status >= 0) {
1192 ff_layout_mark_ds_reachable(lseg, idx);
df3ab232 1193 return 0;
76c66905 1194 }
df3ab232
TM		 1195
1196 /* Handle the case of an invalid layout segment */
1197 if (!pnfs_is_valid_lseg(lseg))
1198 return -NFS4ERR_RESET_TO_PNFS;
1199
d67ae825
TH		 1200 switch (vers) {
1201 case 3:
1202 return ff_layout_async_handle_error_v3(task, lseg, idx);
1203 case 4:
1204 return ff_layout_async_handle_error_v4(task, state, clp,
1205 lseg, idx);
1206 default:
1207 /* should never happen */
1208 WARN_ON_ONCE(1);
1209 return 0;
1210 }
1211}
1212
1213static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1214 int idx, u64 offset, u64 length,
088f3e68 1215 u32 *op_status, int opnum, int error)
d67ae825
TH		 1216{
1217 struct nfs4_ff_layout_mirror *mirror;
088f3e68 1218 u32 status = *op_status;
d67ae825
TH		 1219 int err;
1220
dd52128a
TM		 1221 if (status == 0) {
1222 switch (error) {
1223 case -ETIMEDOUT:
1224 case -EPFNOSUPPORT:
1225 case -EPROTONOSUPPORT:
1226 case -EOPNOTSUPP:
1227 case -ECONNREFUSED:
1228 case -ECONNRESET:
1229 case -EHOSTDOWN:
1230 case -EHOSTUNREACH:
1231 case -ENETUNREACH:
1232 case -EADDRINUSE:
1233 case -ENOBUFS:
1234 case -EPIPE:
1235 case -EPERM:
088f3e68 1236 *op_status = status = NFS4ERR_NXIO;
dd52128a
TM		 1237 break;
1238 case -EACCES:
088f3e68 1239 *op_status = status = NFS4ERR_ACCESS;
dd52128a
TM		 1240 break;
1241 default:
1242 return;
1243 }
1244 }
1245
194a0dc8
TM		 1246 mirror = FF_LAYOUT_COMP(lseg, idx);
1247 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1248 mirror, offset, length, status, opnum,
1249 GFP_NOIO);
1250
c22eeb86
PT		 1251 switch (status) {
1252 case NFS4ERR_DELAY:
1253 case NFS4ERR_GRACE:
c22eeb86 1254 break;
194a0dc8
TM		 1255 case NFS4ERR_NXIO:
1256 ff_layout_mark_ds_unreachable(lseg, idx);
563c53e7
TM		 1257 /*
1258 * Don't return the layout if this is a read and we still
1259 * have layouts to try
1260 */
1261 if (opnum == OP_READ)
1262 break;
df561f66 1263 fallthrough;
194a0dc8
TM		 1264 default:
1265 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1266 lseg);
c22eeb86
PT		 1267 }
1268
d67ae825
TH		 1269 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1270}
1271
1272/* NFS_PROTO call done callback routines */
d67ae825
TH		 1273static int ff_layout_read_done_cb(struct rpc_task *task,
1274 struct nfs_pgio_header *hdr)
1275{
d67ae825
TH		 1276 int err;
1277
088f3e68 1278 if (task->tk_status < 0) {
d67ae825
TH		 1279 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1280 hdr->args.offset, hdr->args.count,
088f3e68 1281 &hdr->res.op_status, OP_READ,
dd52128a 1282 task->tk_status);
088f3e68
TM		 1283 trace_ff_layout_read_error(hdr);
1284 }
1285
d67ae825
TH		 1286 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1287 hdr->ds_clp, hdr->lseg,
1288 hdr->pgio_mirror_idx);
1289
0722dc9f 1290 trace_nfs4_pnfs_read(hdr, err);
42f86b44
TM		 1291 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1292 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1293 switch (err) {
1294 case -NFS4ERR_RESET_TO_PNFS:
42f86b44 1295 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
d67ae825
TH		 1296 return task->tk_status;
1297 case -NFS4ERR_RESET_TO_MDS:
42f86b44 1298 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1299 return task->tk_status;
1300 case -EAGAIN:
13544412 1301 goto out_eagain;
d67ae825
TH		 1302 }
1303
1304 return 0;
13544412
TM		 1305out_eagain:
1306 rpc_restart_call_prepare(task);
1307 return -EAGAIN;
d67ae825
TH		 1308}
1309
c0f5f505
TM		 1310static bool
1311ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1312{
1313 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1314}
1315
d67ae825
TH		 1316/*
1317 * We reference the rpc_cred of the first WRITE that triggers the need for
1318 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1319 * rfc5661 is not clear about which credential should be used.
1320 *
1321 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1322 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1323 * we always send layoutcommit after DS writes.
1324 */
1325static void
bc28e1c2
TM		 1326ff_layout_set_layoutcommit(struct inode *inode,
1327 struct pnfs_layout_segment *lseg,
1328 loff_t end_offset)
d67ae825 1329{
bc28e1c2 1330 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1331 return;
1332
bc28e1c2
TM		 1333 pnfs_set_layoutcommit(inode, lseg, end_offset);
1334 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1335 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1336}
1337
37e9ed22
TM		 1338static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1339 struct nfs_pgio_header *hdr)
d67ae825 1340{
37e9ed22
TM		 1341 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1342 return;
0b7baf94 1343 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1344 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1345 hdr->args.count,
1346 task->tk_start);
37e9ed22
TM		 1347}
1348
1349static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1350 struct nfs_pgio_header *hdr)
1351{
1352 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1353 return;
1354 nfs4_ff_layout_stat_io_end_read(task,
1355 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1356 hdr->args.count,
1357 hdr->res.count);
056f9ad6 1358 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1359}
abcb7bfc 1360
37e9ed22
TM		 1361static int ff_layout_read_prepare_common(struct rpc_task *task,
1362 struct nfs_pgio_header *hdr)
1363{
d67ae825
TH		 1364 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1365 rpc_exit(task, -EIO);
1366 return -EIO;
1367 }
d67ae825 1368
37e9ed22 1369 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1370 return 0;
1371}
1372
1373/*
1374 * Call ops for the async read/write cases
1375 * In the case of dense layouts, the offset needs to be reset to its
1376 * original value.
1377 */
1378static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1379{
1380 struct nfs_pgio_header *hdr = data;
1381
1382 if (ff_layout_read_prepare_common(task, hdr))
1383 return;
1384
1385 rpc_call_start(task);
1386}
1387
d67ae825
TH		 1388static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1389{
1390 struct nfs_pgio_header *hdr = data;
1391
6de7e12f
AS		 1392 if (nfs4_setup_sequence(hdr->ds_clp,
1393 &hdr->args.seq_args,
1394 &hdr->res.seq_res,
1395 task))
d67ae825
TH		 1396 return;
1397
bb21ce0a 1398 ff_layout_read_prepare_common(task, hdr);
d67ae825
TH		 1399}
1400
1401static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1402{
1403 struct nfs_pgio_header *hdr = data;
1404
1405 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1406
1407 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1408 task->tk_status == 0) {
1409 nfs4_sequence_done(task, &hdr->res.seq_res);
1410 return;
1411 }
1412
1413 /* Note this may cause RPC to be resent */
1414 hdr->mds_ops->rpc_call_done(task, hdr);
1415}
1416
1417static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1418{
1419 struct nfs_pgio_header *hdr = data;
1420
37e9ed22 1421 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1422 rpc_count_iostats_metrics(task,
1423 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1424}
1425
4d0ac221
TM		 1426static void ff_layout_read_release(void *data)
1427{
1428 struct nfs_pgio_header *hdr = data;
1429
1430 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
563c53e7
TM		 1431 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1432 ff_layout_resend_pnfs_read(hdr);
1433 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
42f86b44 1434 ff_layout_reset_read(hdr);
4d0ac221
TM		 1435 pnfs_generic_rw_release(data);
1436}
1437
1438
d67ae825
TH		 1439static int ff_layout_write_done_cb(struct rpc_task *task,
1440 struct nfs_pgio_header *hdr)
1441{
2e18d4d8 1442 loff_t end_offs = 0;
d67ae825
TH		 1443 int err;
1444
088f3e68 1445 if (task->tk_status < 0) {
d67ae825
TH		 1446 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1447 hdr->args.offset, hdr->args.count,
088f3e68 1448 &hdr->res.op_status, OP_WRITE,
dd52128a 1449 task->tk_status);
088f3e68
TM		 1450 trace_ff_layout_write_error(hdr);
1451 }
1452
d67ae825
TH		 1453 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1454 hdr->ds_clp, hdr->lseg,
1455 hdr->pgio_mirror_idx);
1456
0722dc9f 1457 trace_nfs4_pnfs_write(hdr, err);
7b0df92a
TM		 1458 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1459 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1460 switch (err) {
1461 case -NFS4ERR_RESET_TO_PNFS:
7b0df92a 1462 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
7cc8c5cd 1463 return task->tk_status;
d67ae825 1464 case -NFS4ERR_RESET_TO_MDS:
7b0df92a 1465 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1466 return task->tk_status;
1467 case -EAGAIN:
d67ae825
TH		 1468 return -EAGAIN;
1469 }
1470
1471 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1472 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1473 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1474
1475 /* Note: if the write is unstable, don't set end_offs until commit */
1476 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1477
54204010
PT		 1478 /* zero out fattr since we don't care DS attr at all */
1479 hdr->fattr.valid = 0;
69f230d9
PT		 1480 if (task->tk_status >= 0)
1481 nfs_writeback_update_inode(hdr);
1482
d67ae825
TH		 1483 return 0;
1484}
1485
1486static int ff_layout_commit_done_cb(struct rpc_task *task,
1487 struct nfs_commit_data *data)
1488{
d67ae825
TH		 1489 int err;
1490
088f3e68 1491 if (task->tk_status < 0) {
d67ae825
TH		 1492 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1493 data->args.offset, data->args.count,
088f3e68 1494 &data->res.op_status, OP_COMMIT,
dd52128a 1495 task->tk_status);
088f3e68
TM		 1496 trace_ff_layout_commit_error(data);
1497 }
1498
d67ae825
TH		 1499 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1500 data->lseg, data->ds_commit_index);
1501
0722dc9f 1502 trace_nfs4_pnfs_commit_ds(data, err);
d67ae825
TH		 1503 switch (err) {
1504 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1505 pnfs_generic_prepare_to_resend_writes(data);
1506 return -EAGAIN;
d67ae825 1507 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1508 pnfs_generic_prepare_to_resend_writes(data);
1509 return -EAGAIN;
1510 case -EAGAIN:
1511 rpc_restart_call_prepare(task);
1512 return -EAGAIN;
1513 }
1514
bc28e1c2 1515 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1516
1517 return 0;
1518}
1519
37e9ed22
TM		 1520static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1521 struct nfs_pgio_header *hdr)
d67ae825 1522{
37e9ed22
TM		 1523 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1524 return;
0b7baf94 1525 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1526 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1527 hdr->args.count,
1528 task->tk_start);
37e9ed22
TM		 1529}
1530
1531static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1532 struct nfs_pgio_header *hdr)
1533{
1534 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1535 return;
1536 nfs4_ff_layout_stat_io_end_write(task,
1537 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1538 hdr->args.count, hdr->res.count,
1539 hdr->res.verf->committed);
056f9ad6 1540 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1541}
abcb7bfc 1542
37e9ed22
TM		 1543static int ff_layout_write_prepare_common(struct rpc_task *task,
1544 struct nfs_pgio_header *hdr)
1545{
d67ae825
TH		 1546 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1547 rpc_exit(task, -EIO);
1548 return -EIO;
1549 }
1550
37e9ed22 1551 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1552 return 0;
1553}
1554
1555static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1556{
1557 struct nfs_pgio_header *hdr = data;
1558
1559 if (ff_layout_write_prepare_common(task, hdr))
1560 return;
1561
1562 rpc_call_start(task);
1563}
1564
1565static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1566{
1567 struct nfs_pgio_header *hdr = data;
1568
6de7e12f
AS		 1569 if (nfs4_setup_sequence(hdr->ds_clp,
1570 &hdr->args.seq_args,
1571 &hdr->res.seq_res,
1572 task))
d67ae825
TH		 1573 return;
1574
bb21ce0a 1575 ff_layout_write_prepare_common(task, hdr);
d67ae825
TH		 1576}
1577
1578static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1579{
1580 struct nfs_pgio_header *hdr = data;
1581
1582 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1583 task->tk_status == 0) {
1584 nfs4_sequence_done(task, &hdr->res.seq_res);
1585 return;
1586 }
1587
1588 /* Note this may cause RPC to be resent */
1589 hdr->mds_ops->rpc_call_done(task, hdr);
1590}
1591
1592static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1593{
1594 struct nfs_pgio_header *hdr = data;
1595
37e9ed22 1596 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1597 rpc_count_iostats_metrics(task,
1598 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1599}
1600
4d0ac221
TM		 1601static void ff_layout_write_release(void *data)
1602{
1603 struct nfs_pgio_header *hdr = data;
1604
1605 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
f0922a6c
TM		 1606 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1607 ff_layout_send_layouterror(hdr->lseg);
7b0df92a 1608 ff_layout_reset_write(hdr, true);
f0922a6c 1609 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
7b0df92a 1610 ff_layout_reset_write(hdr, false);
4d0ac221
TM		 1611 pnfs_generic_rw_release(data);
1612}
1613
37e9ed22 1614static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1615 struct nfs_commit_data *cdata)
1616{
37e9ed22
TM		 1617 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1618 return;
0b7baf94 1619 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1620 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1621 0, task->tk_start);
abcb7bfc
TM		 1622}
1623
37e9ed22
TM		 1624static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1625 struct nfs_commit_data *cdata)
1626{
1627 struct nfs_page *req;
1628 __u64 count = 0;
1629
1630 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1631 return;
1632
1633 if (task->tk_status == 0) {
1634 list_for_each_entry(req, &cdata->pages, wb_list)
1635 count += req->wb_bytes;
1636 }
1637 nfs4_ff_layout_stat_io_end_write(task,
1638 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1639 count, count, NFS_FILE_SYNC);
056f9ad6 1640 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
37e9ed22
TM		 1641}
1642
1643static void ff_layout_commit_prepare_common(struct rpc_task *task,
1644 struct nfs_commit_data *cdata)
1645{
1646 ff_layout_commit_record_layoutstats_start(task, cdata);
1647}
1648
d67ae825
TH		 1649static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1650{
abcb7bfc 1651 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1652 rpc_call_start(task);
1653}
1654
1655static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1656{
1657 struct nfs_commit_data *wdata = data;
1658
6de7e12f
AS		 1659 if (nfs4_setup_sequence(wdata->ds_clp,
1660 &wdata->args.seq_args,
1661 &wdata->res.seq_res,
1662 task))
abcb7bfc
TM		 1663 return;
1664 ff_layout_commit_prepare_common(task, data);
1665}
1666
1667static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1668{
1669 pnfs_generic_write_commit_done(task, data);
1670}
1671
1672static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1673{
1674 struct nfs_commit_data *cdata = data;
abcb7bfc 1675
37e9ed22 1676 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1677 rpc_count_iostats_metrics(task,
1678 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1679}
1680
4d0ac221
TM		 1681static void ff_layout_commit_release(void *data)
1682{
1683 struct nfs_commit_data *cdata = data;
1684
1685 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1686 pnfs_generic_commit_release(data);
1687}
1688
d67ae825
TH		 1689static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1690 .rpc_call_prepare = ff_layout_read_prepare_v3,
1691 .rpc_call_done = ff_layout_read_call_done,
1692 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1693 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1694};
1695
1696static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1697 .rpc_call_prepare = ff_layout_read_prepare_v4,
1698 .rpc_call_done = ff_layout_read_call_done,
1699 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1700 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1701};
1702
1703static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1704 .rpc_call_prepare = ff_layout_write_prepare_v3,
1705 .rpc_call_done = ff_layout_write_call_done,
1706 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1707 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1708};
1709
1710static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1711 .rpc_call_prepare = ff_layout_write_prepare_v4,
1712 .rpc_call_done = ff_layout_write_call_done,
1713 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1714 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1715};
1716
1717static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1718 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1719 .rpc_call_done = ff_layout_commit_done,
d67ae825 1720 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1721 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1722};
1723
1724static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1725 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1726 .rpc_call_done = ff_layout_commit_done,
d67ae825 1727 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1728 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1729};
1730
1731static enum pnfs_try_status
1732ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1733{
1734 struct pnfs_layout_segment *lseg = hdr->lseg;
1735 struct nfs4_pnfs_ds *ds;
1736 struct rpc_clnt *ds_clnt;
2444ff27 1737 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1738 const struct cred *ds_cred;
d67ae825
TH		 1739 loff_t offset = hdr->args.offset;
1740 u32 idx = hdr->pgio_mirror_idx;
1741 int vers;
1742 struct nfs_fh *fh;
1743
5b5e0928 1744 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
d67ae825
TH		 1745 __func__, hdr->inode->i_ino,
1746 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1747
2444ff27
TM		 1748 mirror = FF_LAYOUT_COMP(lseg, idx);
1749 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
d67ae825
TH		 1750 if (!ds)
1751 goto out_failed;
1752
561d6f8a 1753 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1754 hdr->inode);
1755 if (IS_ERR(ds_clnt))
1756 goto out_failed;
1757
312cd4cb 1758 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
57f3f4c0 1759 if (!ds_cred)
d67ae825
TH		 1760 goto out_failed;
1761
626d48b1 1762 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825
TH		 1763
1764 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
212bf41d 1765 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
d67ae825 1766
75bf47eb 1767 hdr->pgio_done_cb = ff_layout_read_done_cb;
212bf41d 1768 refcount_inc(&ds->ds_clp->cl_count);
d67ae825 1769 hdr->ds_clp = ds->ds_clp;
749da527 1770 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1771 if (fh)
1772 hdr->args.fh = fh;
bb21ce0a 1773
4cbc8a57 1774 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
bb21ce0a 1775
d67ae825
TH		 1776 /*
1777 * Note that if we ever decide to split across DSes,
1778 * then we may need to handle dense-like offsets.
1779 */
1780 hdr->args.offset = offset;
1781 hdr->mds_offset = offset;
1782
1783 /* Perform an asynchronous read to ds */
1784 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1785 vers == 3 ? &ff_layout_read_call_ops_v3 :
1786 &ff_layout_read_call_ops_v4,
1787 0, RPC_TASK_SOFTCONN);
a52458b4 1788 put_cred(ds_cred);
d67ae825
TH		 1789 return PNFS_ATTEMPTED;
1790
1791out_failed:
3b13b4b3 1792 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825 1793 return PNFS_TRY_AGAIN;
d5b9216f
TM		 1794 trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1795 hdr->args.offset, hdr->args.count,
1796 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
d67ae825
TH		 1797 return PNFS_NOT_ATTEMPTED;
1798}
1799
1800/* Perform async writes. */
1801static enum pnfs_try_status
1802ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1803{
1804 struct pnfs_layout_segment *lseg = hdr->lseg;
1805 struct nfs4_pnfs_ds *ds;
1806 struct rpc_clnt *ds_clnt;
2444ff27 1807 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1808 const struct cred *ds_cred;
d67ae825
TH		 1809 loff_t offset = hdr->args.offset;
1810 int vers;
1811 struct nfs_fh *fh;
1812 int idx = hdr->pgio_mirror_idx;
1813
2444ff27
TM		 1814 mirror = FF_LAYOUT_COMP(lseg, idx);
1815 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825 1816 if (!ds)
37f8aa16 1817 goto out_failed;
d67ae825 1818
561d6f8a 1819 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1820 hdr->inode);
1821 if (IS_ERR(ds_clnt))
37f8aa16 1822 goto out_failed;
d67ae825 1823
312cd4cb 1824 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
57f3f4c0 1825 if (!ds_cred)
37f8aa16 1826 goto out_failed;
d67ae825 1827
626d48b1 1828 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825 1829
5b5e0928 1830 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
d67ae825 1831 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
212bf41d 1832 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1833 vers);
1834
1835 hdr->pgio_done_cb = ff_layout_write_done_cb;
212bf41d 1836 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1837 hdr->ds_clp = ds->ds_clp;
1838 hdr->ds_commit_idx = idx;
749da527 1839 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1840 if (fh)
1841 hdr->args.fh = fh;
1842
4cbc8a57 1843 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
bb21ce0a 1844
d67ae825
TH		 1845 /*
1846 * Note that if we ever decide to split across DSes,
1847 * then we may need to handle dense-like offsets.
1848 */
1849 hdr->args.offset = offset;
1850
1851 /* Perform an asynchronous write */
1852 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1853 vers == 3 ? &ff_layout_write_call_ops_v3 :
1854 &ff_layout_write_call_ops_v4,
1855 sync, RPC_TASK_SOFTCONN);
a52458b4 1856 put_cred(ds_cred);
d67ae825 1857 return PNFS_ATTEMPTED;
37f8aa16
TM		 1858
1859out_failed:
1860 if (ff_layout_avoid_mds_available_ds(lseg))
1861 return PNFS_TRY_AGAIN;
d5b9216f
TM		 1862 trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1863 hdr->args.offset, hdr->args.count,
1864 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
37f8aa16 1865 return PNFS_NOT_ATTEMPTED;
d67ae825
TH		 1866}
1867
d67ae825
TH		 1868static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1869{
1870 return i;
1871}
1872
1873static struct nfs_fh *
1874select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1875{
1876 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1877
1878 /* FIXME: Assume that there is only one NFS version available
1879 * for the DS.
1880 */
1881 return &flseg->mirror_array[i]->fh_versions[0];
1882}
1883
1884static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1885{
1886 struct pnfs_layout_segment *lseg = data->lseg;
1887 struct nfs4_pnfs_ds *ds;
1888 struct rpc_clnt *ds_clnt;
2444ff27 1889 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1890 const struct cred *ds_cred;
d67ae825 1891 u32 idx;
57f3f4c0 1892 int vers, ret;
d67ae825
TH		 1893 struct nfs_fh *fh;
1894
4b75053e
TM		 1895 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1896 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1897 goto out_err;
1898
d67ae825 1899 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
2444ff27
TM		 1900 mirror = FF_LAYOUT_COMP(lseg, idx);
1901 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825
TH		 1902 if (!ds)
1903 goto out_err;
1904
561d6f8a 1905 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1906 data->inode);
1907 if (IS_ERR(ds_clnt))
1908 goto out_err;
1909
312cd4cb 1910 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
57f3f4c0 1911 if (!ds_cred)
d67ae825
TH		 1912 goto out_err;
1913
626d48b1 1914 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825
TH		 1915
1916 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
212bf41d 1917 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1918 vers);
1919 data->commit_done_cb = ff_layout_commit_done_cb;
1920 data->cred = ds_cred;
212bf41d 1921 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1922 data->ds_clp = ds->ds_clp;
1923 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1924 if (fh)
1925 data->args.fh = fh;
abcb7bfc 1926
57f3f4c0 1927 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1928 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1929 &ff_layout_commit_call_ops_v4,
1930 how, RPC_TASK_SOFTCONN);
a52458b4 1931 put_cred(ds_cred);
57f3f4c0 1932 return ret;
d67ae825
TH		 1933out_err:
1934 pnfs_generic_prepare_to_resend_writes(data);
1935 pnfs_generic_commit_release(data);
1936 return -EAGAIN;
1937}
1938
1939static int
1940ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1941 int how, struct nfs_commit_info *cinfo)
1942{
1943 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1944 ff_layout_initiate_commit);
1945}
1946
1947static struct pnfs_ds_commit_info *
1948ff_layout_get_ds_info(struct inode *inode)
1949{
1950 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1951
1952 if (layout == NULL)
1953 return NULL;
1954
1955 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1956}
1957
ba827c9a
TM		 1958static void
1959ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1960 struct pnfs_layout_segment *lseg)
1961{
1962 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1963 struct inode *inode = lseg->pls_layout->plh_inode;
1964 struct pnfs_commit_array *array, *new;
1965
1966 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt, GFP_NOIO);
1967 if (new) {
1968 spin_lock(&inode->i_lock);
1969 array = pnfs_add_commit_array(fl_cinfo, new, lseg);
1970 spin_unlock(&inode->i_lock);
1971 if (array != new)
1972 pnfs_free_commit_array(new);
1973 }
1974}
1975
a9901899
TM		 1976static void
1977ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1978 struct inode *inode)
1979{
1980 spin_lock(&inode->i_lock);
1981 pnfs_generic_ds_cinfo_destroy(fl_cinfo);
1982 spin_unlock(&inode->i_lock);
1983}
1984
d67ae825 1985static void
fc87701b 1986ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1987{
1988 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1989 id_node));
1990}
1991
5ba6a09e 1992static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
5b9b3c85
TM		 1993 const struct nfs4_layoutreturn_args *args,
1994 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1995{
d67ae825 1996 __be32 *start;
d67ae825
TH		 1997
1998 start = xdr_reserve_space(xdr, 4);
1999 if (unlikely(!start))
2000 return -E2BIG;
2001
5b9b3c85 2002 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 2003 /* This assume we always return _ALL_ layouts */
5b9b3c85 2004 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 2005}
2006
230bc962
TM		 2007static void
2008encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2009{
ab6e9aaf 2010 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
230bc962
TM		 2011}
2012
2013static void
2014ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2015 const nfs4_stateid *stateid,
2016 const struct nfs42_layoutstat_devinfo *devinfo)
2017{
2018 __be32 *p;
2019
2020 p = xdr_reserve_space(xdr, 8 + 8);
2021 p = xdr_encode_hyper(p, devinfo->offset);
2022 p = xdr_encode_hyper(p, devinfo->length);
2023 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2024 p = xdr_reserve_space(xdr, 4*8);
2025 p = xdr_encode_hyper(p, devinfo->read_count);
2026 p = xdr_encode_hyper(p, devinfo->read_bytes);
2027 p = xdr_encode_hyper(p, devinfo->write_count);
2028 p = xdr_encode_hyper(p, devinfo->write_bytes);
2029 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2030}
2031
2032static void
2033ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2034 const nfs4_stateid *stateid,
2035 const struct nfs42_layoutstat_devinfo *devinfo)
2036{
2037 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2038 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2039 devinfo->ld_private.data);
2040}
2041
d67ae825 2042/* report nothing for now */
230bc962
TM		 2043static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2044 const struct nfs4_layoutreturn_args *args,
2045 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 2046{
2047 __be32 *p;
230bc962 2048 int i;
d67ae825
TH		 2049
2050 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 2051 *p = cpu_to_be32(ff_args->num_dev);
2052 for (i = 0; i < ff_args->num_dev; i++)
2053 ff_layout_encode_ff_iostat(xdr,
2054 &args->layout->plh_stateid,
2055 &ff_args->devinfo[i]);
2056}
2057
2058static void
2059ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2060 unsigned int num_entries)
2061{
2062 unsigned int i;
2063
2064 for (i = 0; i < num_entries; i++) {
2065 if (!devinfo[i].ld_private.ops)
2066 continue;
2067 if (!devinfo[i].ld_private.ops->free)
2068 continue;
2069 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2070 }
d67ae825
TH		 2071}
2072
2073static struct nfs4_deviceid_node *
2074ff_layout_alloc_deviceid_node(struct nfs_server *server,
2075 struct pnfs_device *pdev, gfp_t gfp_flags)
2076{
2077 struct nfs4_ff_layout_ds *dsaddr;
2078
2079 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2080 if (!dsaddr)
2081 return NULL;
2082 return &dsaddr->id_node;
2083}
2084
2085static void
94e5c571 2086ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2087 const void *voidargs,
2088 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2089{
5b9b3c85 2090 const struct nfs4_layoutreturn_args *args = voidargs;
5ba6a09e 2091 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
d9152114
TM		 2092 struct xdr_buf tmp_buf = {
2093 .head = {
2094 [0] = {
2095 .iov_base = page_address(ff_args->pages[0]),
2096 },
2097 },
2098 .buflen = PAGE_SIZE,
2099 };
2100 struct xdr_stream tmp_xdr;
d67ae825
TH		 2101 __be32 *start;
2102
2103 dprintk("%s: Begin\n", __func__);
d67ae825 2104
0ccc61b1 2105 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
d9152114
TM		 2106
2107 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2108 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2109
2110 start = xdr_reserve_space(xdr, 4);
2111 *start = cpu_to_be32(tmp_buf.len);
2112 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
082fa37d 2113
d67ae825
TH		 2114 dprintk("%s: Return\n", __func__);
2115}
2116
5b9b3c85
TM		 2117static void
2118ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2119{
2120 struct nfs4_flexfile_layoutreturn_args *ff_args;
2121
2122 if (!args->data)
2123 return;
2124 ff_args = args->data;
2125 args->data = NULL;
2126
2127 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2128 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85 2129
d9152114 2130 put_page(ff_args->pages[0]);
5b9b3c85
TM		 2131 kfree(ff_args);
2132}
2133
2e54b9b1 2134static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
5b9b3c85
TM		 2135 .encode = ff_layout_encode_layoutreturn,
2136 .free = ff_layout_free_layoutreturn,
2137};
2138
2139static int
2140ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2141{
2142 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2143 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85
TM		 2144
2145 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2146 if (!ff_args)
d9152114
TM		 2147 goto out_nomem;
2148 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2149 if (!ff_args->pages[0])
2150 goto out_nomem_free;
5b9b3c85
TM		 2151
2152 INIT_LIST_HEAD(&ff_args->errors);
2153 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2154 &args->range, &ff_args->errors,
2155 FF_LAYOUTRETURN_MAXERR);
2156
230bc962
TM		 2157 spin_lock(&args->inode->i_lock);
2158 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2159 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2160 spin_unlock(&args->inode->i_lock);
2161
5b9b3c85
TM		 2162 args->ld_private->ops = &layoutreturn_ops;
2163 args->ld_private->data = ff_args;
2164 return 0;
d9152114
TM		 2165out_nomem_free:
2166 kfree(ff_args);
2167out_nomem:
2168 return -ENOMEM;
5b9b3c85
TM		 2169}
2170
f0922a6c
TM		 2171#ifdef CONFIG_NFS_V4_2
2172void
2173ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2174{
2175 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2176 struct nfs42_layout_error *errors;
2177 LIST_HEAD(head);
2178
2179 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2180 return;
2181 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2182 if (list_empty(&head))
2183 return;
2184
2185 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX,
2186 sizeof(*errors), GFP_NOFS);
2187 if (errors != NULL) {
2188 const struct nfs4_ff_layout_ds_err *pos;
2189 size_t n = 0;
2190
2191 list_for_each_entry(pos, &head, list) {
2192 errors[n].offset = pos->offset;
2193 errors[n].length = pos->length;
2194 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2195 errors[n].errors[0].dev_id = pos->deviceid;
2196 errors[n].errors[0].status = pos->status;
2197 errors[n].errors[0].opnum = pos->opnum;
2198 n++;
2199 if (!list_is_last(&pos->list, &head) &&
2200 n < NFS42_LAYOUTERROR_MAX)
2201 continue;
2202 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2203 break;
2204 n = 0;
2205 }
2206 kfree(errors);
2207 }
2208 ff_layout_free_ds_ioerr(&head);
2209}
2210#else
2211void
2212ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2213{
2214}
2215#endif
2216
27c43064
PT		 2217static int
2218ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2219{
2220 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2221
2222 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2223}
2224
2225static size_t
2226ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2227 const int buflen)
2228{
2229 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2230 const struct in6_addr *addr = &sin6->sin6_addr;
2231
2232 /*
2233 * RFC 4291, Section 2.2.2
2234 *
2235 * Shorthanded ANY address
2236 */
2237 if (ipv6_addr_any(addr))
2238 return snprintf(buf, buflen, "::");
2239
2240 /*
2241 * RFC 4291, Section 2.2.2
2242 *
2243 * Shorthanded loopback address
2244 */
2245 if (ipv6_addr_loopback(addr))
2246 return snprintf(buf, buflen, "::1");
2247
2248 /*
2249 * RFC 4291, Section 2.2.3
2250 *
2251 * Special presentation address format for mapped v4
2252 * addresses.
2253 */
2254 if (ipv6_addr_v4mapped(addr))
2255 return snprintf(buf, buflen, "::ffff:%pI4",
2256 &addr->s6_addr32[3]);
2257
2258 /*
2259 * RFC 4291, Section 2.2.1
2260 */
2261 return snprintf(buf, buflen, "%pI6c", addr);
2262}
2263
2264/* Derived from rpc_sockaddr2uaddr */
2265static void
2266ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2267{
2268 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2269 char portbuf[RPCBIND_MAXUADDRPLEN];
2270 char addrbuf[RPCBIND_MAXUADDRLEN];
2271 char *netid;
2272 unsigned short port;
2273 int len, netid_len;
2274 __be32 *p;
2275
2276 switch (sap->sa_family) {
2277 case AF_INET:
2278 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2279 return;
2280 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2281 netid = "tcp";
2282 netid_len = 3;
2283 break;
2284 case AF_INET6:
2285 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2286 return;
2287 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2288 netid = "tcp6";
2289 netid_len = 4;
2290 break;
2291 default:
2292 /* we only support tcp and tcp6 */
2293 WARN_ON_ONCE(1);
2294 return;
2295 }
2296
2297 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2298 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2299
2300 p = xdr_reserve_space(xdr, 4 + netid_len);
2301 xdr_encode_opaque(p, netid, netid_len);
2302
2303 p = xdr_reserve_space(xdr, 4 + len);
2304 xdr_encode_opaque(p, addrbuf, len);
2305}
2306
2307static void
2308ff_layout_encode_nfstime(struct xdr_stream *xdr,
2309 ktime_t t)
2310{
2311 struct timespec64 ts;
2312 __be32 *p;
2313
2314 p = xdr_reserve_space(xdr, 12);
2315 ts = ktime_to_timespec64(t);
2316 p = xdr_encode_hyper(p, ts.tv_sec);
2317 *p++ = cpu_to_be32(ts.tv_nsec);
2318}
2319
2320static void
2321ff_layout_encode_io_latency(struct xdr_stream *xdr,
2322 struct nfs4_ff_io_stat *stat)
2323{
2324 __be32 *p;
2325
2326 p = xdr_reserve_space(xdr, 5 * 8);
2327 p = xdr_encode_hyper(p, stat->ops_requested);
2328 p = xdr_encode_hyper(p, stat->bytes_requested);
2329 p = xdr_encode_hyper(p, stat->ops_completed);
2330 p = xdr_encode_hyper(p, stat->bytes_completed);
2331 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2332 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2333 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2334}
2335
2336static void
422c93c8
TM		 2337ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2338 const struct nfs42_layoutstat_devinfo *devinfo,
2339 struct nfs4_ff_layout_mirror *mirror)
27c43064 2340{
27c43064
PT		 2341 struct nfs4_pnfs_ds_addr *da;
2342 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2343 struct nfs_fh *fh = &mirror->fh_versions[0];
422c93c8 2344 __be32 *p;
27c43064
PT		 2345
2346 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2347 dprintk("%s: DS %s: encoding address %s\n",
2348 __func__, ds->ds_remotestr, da->da_remotestr);
27c43064
PT		 2349 /* netaddr4 */
2350 ff_layout_encode_netaddr(xdr, da);
2351 /* nfs_fh4 */
2352 p = xdr_reserve_space(xdr, 4 + fh->size);
2353 xdr_encode_opaque(p, fh->data, fh->size);
2354 /* ff_io_latency4 read */
2355 spin_lock(&mirror->lock);
2356 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2357 /* ff_io_latency4 write */
2358 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2359 spin_unlock(&mirror->lock);
2360 /* nfstime4 */
2361 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2362 /* bool */
2363 p = xdr_reserve_space(xdr, 4);
2364 *p = cpu_to_be32(false);
422c93c8
TM		 2365}
2366
2367static void
2368ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2369 const struct nfs4_xdr_opaque_data *opaque)
2370{
2371 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2372 struct nfs42_layoutstat_devinfo, ld_private);
2373 __be32 *start;
2374
2375 /* layoutupdate length */
2376 start = xdr_reserve_space(xdr, 4);
2377 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
27c43064
PT		 2378
2379 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2380}
2381
422c93c8
TM		 2382static void
2383ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2384{
2385 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2386
2387 ff_layout_put_mirror(mirror);
2388}
2389
2390static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2391 .encode = ff_layout_encode_layoutstats,
2392 .free = ff_layout_free_layoutstats,
2393};
2394
266d12d4 2395static int
08e2e5bc
TM		 2396ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2397 struct nfs42_layoutstat_devinfo *devinfo,
266d12d4 2398 int dev_limit)
ad4dc53e 2399{
266d12d4 2400 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2401 struct nfs4_ff_layout_mirror *mirror;
2402 struct nfs4_deviceid_node *dev;
266d12d4 2403 int i = 0;
ad4dc53e 2404
266d12d4
TM		 2405 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2406 if (i >= dev_limit)
ad4dc53e 2407 break;
65990d1a 2408 if (IS_ERR_OR_NULL(mirror->mirror_ds))
27c43064 2409 continue;
06946c6a
TM		 2410 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2411 continue;
266d12d4 2412 /* mirror refcount put in cleanup_layoutstats */
81a090b9 2413 if (!refcount_inc_not_zero(&mirror->ref))
266d12d4
TM		 2414 continue;
2415 dev = &mirror->mirror_ds->id_node;
ad4dc53e 2416 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2417 devinfo->offset = 0;
2418 devinfo->length = NFS4_MAX_UINT64;
2f8220c1 2419 spin_lock(&mirror->lock);
d099d7b8 2420 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2421 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2422 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e 2423 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2f8220c1 2424 spin_unlock(&mirror->lock);
ad4dc53e 2425 devinfo->layout_type = LAYOUT_FLEX_FILES;
422c93c8
TM		 2426 devinfo->ld_private.ops = &layoutstat_ops;
2427 devinfo->ld_private.data = mirror;
ad4dc53e 2428
08e2e5bc 2429 devinfo++;
266d12d4 2430 i++;
ad4dc53e 2431 }
266d12d4 2432 return i;
ad4dc53e
PT		 2433}
2434
2435static int
2436ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2437{
266d12d4 2438 struct nfs4_flexfile_layout *ff_layout;
08e2e5bc 2439 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
ad4dc53e 2440
ad4dc53e 2441 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
266d12d4 2442 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2443 if (!args->devinfo)
2444 return -ENOMEM;
2445
ad4dc53e 2446 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2447 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2448 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2449 &args->devinfo[0], dev_count);
ad4dc53e 2450 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2451 if (!args->num_dev) {
2452 kfree(args->devinfo);
2453 args->devinfo = NULL;
2454 return -ENOENT;
2455 }
ad4dc53e
PT		 2456
2457 return 0;
2458}
2459
76b2a303
TM		 2460static int
2461ff_layout_set_layoutdriver(struct nfs_server *server,
2462 const struct nfs_fh *dummy)
2463{
2464#if IS_ENABLED(CONFIG_NFS_V4_2)
2465 server->caps |= NFS_CAP_LAYOUTSTATS;
2466#endif
2467 return 0;
2468}
2469
9c455a8c
TM		 2470static const struct pnfs_commit_ops ff_layout_commit_ops = {
2471 .setup_ds_info = ff_layout_setup_ds_info,
2472 .release_ds_info = ff_layout_release_ds_info,
2473 .mark_request_commit = pnfs_layout_mark_request_commit,
2474 .clear_request_commit = pnfs_generic_clear_request_commit,
2475 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2476 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2477 .commit_pagelist = ff_layout_commit_pagelist,
2478};
2479
d67ae825
TH		 2480static struct pnfs_layoutdriver_type flexfilelayout_type = {
2481 .id = LAYOUT_FLEX_FILES,
2482 .name = "LAYOUT_FLEX_FILES",
2483 .owner = THIS_MODULE,
f86c3ac5 2484 .flags = PNFS_LAYOUTGET_ON_OPEN,
28ced9a8 2485 .max_layoutget_response = 4096, /* 1 page or so... */
76b2a303 2486 .set_layoutdriver = ff_layout_set_layoutdriver,
d67ae825
TH		 2487 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2488 .free_layout_hdr = ff_layout_free_layout_hdr,
2489 .alloc_lseg = ff_layout_alloc_lseg,
2490 .free_lseg = ff_layout_free_lseg,
0762ed2c 2491 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2492 .pg_read_ops = &ff_layout_pg_read_ops,
2493 .pg_write_ops = &ff_layout_pg_write_ops,
2494 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2495 .free_deviceid_node = ff_layout_free_deviceid_node,
d67ae825
TH		 2496 .read_pagelist = ff_layout_read_pagelist,
2497 .write_pagelist = ff_layout_write_pagelist,
2498 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2499 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2500 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2501 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2502};
2503
2504static int __init nfs4flexfilelayout_init(void)
2505{
2506 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2507 __func__);
2508 return pnfs_register_layoutdriver(&flexfilelayout_type);
2509}
2510
2511static void __exit nfs4flexfilelayout_exit(void)
2512{
2513 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2514 __func__);
2515 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2516}
2517
2518MODULE_ALIAS("nfs-layouttype4-4");
2519
2520MODULE_LICENSE("GPL");
2521MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2522
2523module_init(nfs4flexfilelayout_init);
2524module_exit(nfs4flexfilelayout_exit);
33344e0f
TM		 2525
2526module_param(io_maxretrans, ushort, 0644);
2527MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
2528 "retries an I/O request before returning an error. ");
Linux 6.x block layer and io_uring tree(s)