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Merge branch 'for-6.0/dax' into libnvdimm-fixes
[people/ms/linux.git] / fs / nfs / flexfilelayout / flexfilelayout.c
CommitLineData
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++);
ed34695e 109 if (fh->size > NFS_MAXFHSIZE) {
d67ae825
TH		 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);
0ae4c3e8 381 xdr_set_scratch_page(&stream, scratch);
d67ae825
TH		 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)
3e5f151e 666 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
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)
3e5f151e 697 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
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;
b9df46d0 743 u32 idx;
d67ae825 744
76c66905 745 /* mirrors are initially sorted by efficiency */
13544412 746 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
2444ff27 747 mirror = FF_LAYOUT_COMP(lseg, idx);
9bfffea3 748 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
76c66905 749 if (!ds)
2444ff27
TM		 750 continue;
751
76c66905
TM		 752 if (check_device &&
753 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
754 continue;
755
756 *best_idx = idx;
757 return ds;
d67ae825
TH		 758 }
759
760 return NULL;
761}
762
76c66905
TM		 763static struct nfs4_pnfs_ds *
764ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
b9df46d0 765 u32 start_idx, u32 *best_idx)
76c66905
TM		 766{
767 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
768}
769
770static struct nfs4_pnfs_ds *
771ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
b9df46d0 772 u32 start_idx, u32 *best_idx)
76c66905
TM		 773{
774 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
775}
776
777static struct nfs4_pnfs_ds *
778ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
b9df46d0 779 u32 start_idx, u32 *best_idx)
76c66905
TM		 780{
781 struct nfs4_pnfs_ds *ds;
782
783 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
784 if (ds)
785 return ds;
786 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
787}
788
563c53e7 789static struct nfs4_pnfs_ds *
b9df46d0
TM		 790ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
791 u32 *best_idx)
563c53e7
TM		 792{
793 struct pnfs_layout_segment *lseg = pgio->pg_lseg;
794 struct nfs4_pnfs_ds *ds;
795
796 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
797 best_idx);
798 if (ds || !pgio->pg_mirror_idx)
799 return ds;
800 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
801}
802
c7d73af2
TH		 803static void
804ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
805 struct nfs_page *req,
806 bool strict_iomode)
807{
c7d73af2 808 pnfs_put_lseg(pgio->pg_lseg);
3e5f151e
TM		 809 pgio->pg_lseg =
810 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
811 req_offset(req), req->wb_bytes, IOMODE_READ,
812 strict_iomode, nfs_io_gfp_mask());
c7d73af2
TH		 813 if (IS_ERR(pgio->pg_lseg)) {
814 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
815 pgio->pg_lseg = NULL;
816 }
c7d73af2
TH		 817}
818
e1e54ab7
TM		 819static void
820ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
821 struct nfs_page *req)
822{
823 pnfs_generic_pg_check_layout(pgio);
824 pnfs_generic_pg_check_range(pgio, req);
825}
826
d67ae825
TH		 827static void
828ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
829 struct nfs_page *req)
830{
831 struct nfs_pgio_mirror *pgm;
832 struct nfs4_ff_layout_mirror *mirror;
833 struct nfs4_pnfs_ds *ds;
63e2fffa 834 u32 ds_idx;
d67ae825 835
3dc14735 836retry:
e1e54ab7 837 ff_layout_pg_check_layout(pgio, req);
d67ae825 838 /* Use full layout for now */
1c1aeaf1 839 if (!pgio->pg_lseg) {
c7d73af2 840 ff_layout_pg_get_read(pgio, req, false);
1c1aeaf1
TM		 841 if (!pgio->pg_lseg)
842 goto out_nolseg;
843 }
844 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
c7d73af2 845 ff_layout_pg_get_read(pgio, req, true);
1c1aeaf1
TM		 846 if (!pgio->pg_lseg)
847 goto out_nolseg;
848 }
d67ae825 849
563c53e7 850 ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
446ca219 851 if (!ds) {
3dc14735 852 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 853 goto out_mds;
f97ff92b 854 pnfs_generic_pg_cleanup(pgio);
3dc14735
TM		 855 /* Sleep for 1 second before retrying */
856 ssleep(1);
857 goto retry;
446ca219
TH		 858 }
859
63e2fffa
TM		 860 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
861 pgm = &pgio->pg_mirrors[0];
862 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
d67ae825
TH		 863
864 pgio->pg_mirror_idx = ds_idx;
865
7af46292
TM		 866 if (NFS_SERVER(pgio->pg_inode)->flags &
867 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
868 pgio->pg_maxretrans = io_maxretrans;
d67ae825 869 return;
1c1aeaf1
TM		 870out_nolseg:
871 if (pgio->pg_error < 0)
872 return;
d67ae825 873out_mds:
d5b9216f
TM		 874 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
875 0, NFS4_MAX_UINT64, IOMODE_READ,
876 NFS_I(pgio->pg_inode)->layout,
877 pgio->pg_lseg);
7af46292 878 pgio->pg_maxretrans = 0;
d67ae825
TH		 879 nfs_pageio_reset_read_mds(pgio);
880}
881
882static void
883ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
884 struct nfs_page *req)
885{
886 struct nfs4_ff_layout_mirror *mirror;
887 struct nfs_pgio_mirror *pgm;
d67ae825 888 struct nfs4_pnfs_ds *ds;
b9df46d0 889 u32 i;
d67ae825 890
3dc14735 891retry:
e1e54ab7 892 ff_layout_pg_check_layout(pgio, req);
d600ad1f 893 if (!pgio->pg_lseg) {
3e5f151e
TM		 894 pgio->pg_lseg =
895 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
896 req_offset(req), req->wb_bytes,
897 IOMODE_RW, false, nfs_io_gfp_mask());
d600ad1f
PT		 898 if (IS_ERR(pgio->pg_lseg)) {
899 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
900 pgio->pg_lseg = NULL;
901 return;
902 }
903 }
d67ae825
TH		 904 /* If no lseg, fall back to write through mds */
905 if (pgio->pg_lseg == NULL)
906 goto out_mds;
907
d67ae825 908 /* Use a direct mapping of ds_idx to pgio mirror_idx */
8b040137
TM		 909 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
910 goto out_eagain;
d67ae825
TH		 911
912 for (i = 0; i < pgio->pg_mirror_count; i++) {
2444ff27 913 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
2444ff27 914 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
446ca219 915 if (!ds) {
3dc14735 916 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 917 goto out_mds;
f97ff92b 918 pnfs_generic_pg_cleanup(pgio);
3dc14735
TM		 919 /* Sleep for 1 second before retrying */
920 ssleep(1);
921 goto retry;
446ca219 922 }
d67ae825 923 pgm = &pgio->pg_mirrors[i];
d67ae825
TH		 924 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
925 }
926
7af46292
TM		 927 if (NFS_SERVER(pgio->pg_inode)->flags &
928 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
929 pgio->pg_maxretrans = io_maxretrans;
d67ae825 930 return;
8b040137
TM		 931out_eagain:
932 pnfs_generic_pg_cleanup(pgio);
933 pgio->pg_error = -EAGAIN;
934 return;
d67ae825 935out_mds:
d5b9216f
TM		 936 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
937 0, NFS4_MAX_UINT64, IOMODE_RW,
938 NFS_I(pgio->pg_inode)->layout,
939 pgio->pg_lseg);
7af46292 940 pgio->pg_maxretrans = 0;
d67ae825 941 nfs_pageio_reset_write_mds(pgio);
8b040137 942 pgio->pg_error = -EAGAIN;
d67ae825
TH		 943}
944
945static unsigned int
946ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
947 struct nfs_page *req)
948{
d600ad1f 949 if (!pgio->pg_lseg) {
3e5f151e
TM		 950 pgio->pg_lseg =
951 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
952 req_offset(req), req->wb_bytes,
953 IOMODE_RW, false, nfs_io_gfp_mask());
d600ad1f
PT		 954 if (IS_ERR(pgio->pg_lseg)) {
955 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
956 pgio->pg_lseg = NULL;
957 goto out;
958 }
959 }
d67ae825
TH		 960 if (pgio->pg_lseg)
961 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
962
d5b9216f
TM		 963 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
964 0, NFS4_MAX_UINT64, IOMODE_RW,
965 NFS_I(pgio->pg_inode)->layout,
966 pgio->pg_lseg);
d67ae825 967 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 968 nfs_pageio_reset_write_mds(pgio);
d600ad1f 969out:
d67ae825
TH		 970 return 1;
971}
972
63e2fffa
TM		 973static u32
974ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
975{
976 u32 old = desc->pg_mirror_idx;
977
978 desc->pg_mirror_idx = idx;
979 return old;
980}
981
982static struct nfs_pgio_mirror *
983ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
984{
985 return &desc->pg_mirrors[idx];
986}
987
d67ae825
TH		 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,
63e2fffa
TM		 1001 .pg_get_mirror = ff_layout_pg_get_mirror_write,
1002 .pg_set_mirror = ff_layout_pg_set_mirror_write,
d67ae825
TH		 1003};
1004
1005static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1006{
1007 struct rpc_task *task = &hdr->task;
1008
1009 pnfs_layoutcommit_inode(hdr->inode, false);
1010
1011 if (retry_pnfs) {
1012 dprintk("%s Reset task %5u for i/o through pNFS "
1013 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1014 hdr->task.tk_pid,
1015 hdr->inode->i_sb->s_id,
1016 (unsigned long long)NFS_FILEID(hdr->inode),
1017 hdr->args.count,
1018 (unsigned long long)hdr->args.offset);
1019
dc602dd7 1020 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1021 return;
1022 }
1023
1024 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1025 dprintk("%s Reset task %5u for i/o through MDS "
1026 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1027 hdr->task.tk_pid,
1028 hdr->inode->i_sb->s_id,
1029 (unsigned long long)NFS_FILEID(hdr->inode),
1030 hdr->args.count,
1031 (unsigned long long)hdr->args.offset);
1032
d5b9216f
TM		 1033 trace_pnfs_mds_fallback_write_done(hdr->inode,
1034 hdr->args.offset, hdr->args.count,
1035 IOMODE_RW, NFS_I(hdr->inode)->layout,
1036 hdr->lseg);
d67ae825
TH		 1037 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1038 }
1039}
1040
563c53e7
TM		 1041static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1042{
1043 u32 idx = hdr->pgio_mirror_idx + 1;
b9df46d0 1044 u32 new_idx = 0;
563c53e7 1045
52104f27 1046 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
563c53e7
TM		 1047 ff_layout_send_layouterror(hdr->lseg);
1048 else
1049 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1050 pnfs_read_resend_pnfs(hdr, new_idx);
1051}
1052
d67ae825
TH		 1053static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1054{
1055 struct rpc_task *task = &hdr->task;
1056
1057 pnfs_layoutcommit_inode(hdr->inode, false);
563c53e7 1058 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
d67ae825
TH		 1059
1060 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1061 dprintk("%s Reset task %5u for i/o through MDS "
1062 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1063 hdr->task.tk_pid,
1064 hdr->inode->i_sb->s_id,
1065 (unsigned long long)NFS_FILEID(hdr->inode),
1066 hdr->args.count,
1067 (unsigned long long)hdr->args.offset);
1068
d5b9216f
TM		 1069 trace_pnfs_mds_fallback_read_done(hdr->inode,
1070 hdr->args.offset, hdr->args.count,
1071 IOMODE_READ, NFS_I(hdr->inode)->layout,
1072 hdr->lseg);
d67ae825
TH		 1073 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1074 }
1075}
1076
1077static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1078 struct nfs4_state *state,
1079 struct nfs_client *clp,
1080 struct pnfs_layout_segment *lseg,
b9df46d0 1081 u32 idx)
d67ae825
TH		 1082{
1083 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1084 struct inode *inode = lo->plh_inode;
d67ae825 1085 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
d67ae825
TH		 1086 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1087
d67ae825 1088 switch (task->tk_status) {
d67ae825
TH		 1089 case -NFS4ERR_BADSESSION:
1090 case -NFS4ERR_BADSLOT:
1091 case -NFS4ERR_BAD_HIGH_SLOT:
1092 case -NFS4ERR_DEADSESSION:
1093 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1094 case -NFS4ERR_SEQ_FALSE_RETRY:
1095 case -NFS4ERR_SEQ_MISORDERED:
1096 dprintk("%s ERROR %d, Reset session. Exchangeid "
1097 "flags 0x%x\n", __func__, task->tk_status,
1098 clp->cl_exchange_flags);
1099 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1100 break;
1101 case -NFS4ERR_DELAY:
1102 case -NFS4ERR_GRACE:
1103 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1104 break;
1105 case -NFS4ERR_RETRY_UNCACHED_REP:
1106 break;
1107 /* Invalidate Layout errors */
1108 case -NFS4ERR_PNFS_NO_LAYOUT:
1109 case -ESTALE: /* mapped NFS4ERR_STALE */
1110 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1111 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1112 case -NFS4ERR_FHEXPIRED:
1113 case -NFS4ERR_WRONG_TYPE:
1114 dprintk("%s Invalid layout error %d\n", __func__,
1115 task->tk_status);
1116 /*
1117 * Destroy layout so new i/o will get a new layout.
1118 * Layout will not be destroyed until all current lseg
1119 * references are put. Mark layout as invalid to resend failed
1120 * i/o and all i/o waiting on the slot table to the MDS until
1121 * layout is destroyed and a new valid layout is obtained.
1122 */
1123 pnfs_destroy_layout(NFS_I(inode));
1124 rpc_wake_up(&tbl->slot_tbl_waitq);
1125 goto reset;
1126 /* RPC connection errors */
1127 case -ECONNREFUSED:
1128 case -EHOSTDOWN:
1129 case -EHOSTUNREACH:
1130 case -ENETUNREACH:
1131 case -EIO:
1132 case -ETIMEDOUT:
1133 case -EPIPE:
7836d754
TM		 1134 case -EPROTO:
1135 case -ENODEV:
d67ae825
TH		 1136 dprintk("%s DS connection error %d\n", __func__,
1137 task->tk_status);
1c48cee8
WAA		 1138 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1139 &devid->deviceid);
d67ae825 1140 rpc_wake_up(&tbl->slot_tbl_waitq);
df561f66 1141 fallthrough;
d67ae825 1142 default:
3b13b4b3 1143 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1144 return -NFS4ERR_RESET_TO_PNFS;
1145reset:
1146 dprintk("%s Retry through MDS. Error %d\n", __func__,
1147 task->tk_status);
1148 return -NFS4ERR_RESET_TO_MDS;
1149 }
d67ae825
TH		 1150 task->tk_status = 0;
1151 return -EAGAIN;
d67ae825
TH		 1152}
1153
1154/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1155static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1156 struct pnfs_layout_segment *lseg,
b9df46d0 1157 u32 idx)
d67ae825
TH		 1158{
1159 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1160
90816d1d
TM		 1161 switch (task->tk_status) {
1162 /* File access problems. Don't mark the device as unavailable */
1163 case -EACCES:
1164 case -ESTALE:
1165 case -EISDIR:
1166 case -EBADHANDLE:
1167 case -ELOOP:
1168 case -ENOSPC:
1169 break;
1170 case -EJUKEBOX:
1171 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1172 goto out_retry;
1173 default:
d67ae825
TH		 1174 dprintk("%s DS connection error %d\n", __func__,
1175 task->tk_status);
1c48cee8
WAA		 1176 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1177 &devid->deviceid);
d67ae825 1178 }
90816d1d
TM		 1179 /* FIXME: Need to prevent infinite looping here. */
1180 return -NFS4ERR_RESET_TO_PNFS;
1181out_retry:
d67ae825 1182 task->tk_status = 0;
7eeea167 1183 rpc_restart_call_prepare(task);
d67ae825
TH		 1184 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1185 return -EAGAIN;
1186}
1187
1188static int ff_layout_async_handle_error(struct rpc_task *task,
1189 struct nfs4_state *state,
1190 struct nfs_client *clp,
1191 struct pnfs_layout_segment *lseg,
b9df46d0 1192 u32 idx)
d67ae825
TH		 1193{
1194 int vers = clp->cl_nfs_mod->rpc_vers->number;
1195
76c66905
TM		 1196 if (task->tk_status >= 0) {
1197 ff_layout_mark_ds_reachable(lseg, idx);
df3ab232 1198 return 0;
76c66905 1199 }
df3ab232
TM		 1200
1201 /* Handle the case of an invalid layout segment */
1202 if (!pnfs_is_valid_lseg(lseg))
1203 return -NFS4ERR_RESET_TO_PNFS;
1204
d67ae825
TH		 1205 switch (vers) {
1206 case 3:
1207 return ff_layout_async_handle_error_v3(task, lseg, idx);
1208 case 4:
1209 return ff_layout_async_handle_error_v4(task, state, clp,
1210 lseg, idx);
1211 default:
1212 /* should never happen */
1213 WARN_ON_ONCE(1);
1214 return 0;
1215 }
1216}
1217
1218static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
b9df46d0 1219 u32 idx, u64 offset, u64 length,
088f3e68 1220 u32 *op_status, int opnum, int error)
d67ae825
TH		 1221{
1222 struct nfs4_ff_layout_mirror *mirror;
088f3e68 1223 u32 status = *op_status;
d67ae825
TH		 1224 int err;
1225
dd52128a
TM		 1226 if (status == 0) {
1227 switch (error) {
1228 case -ETIMEDOUT:
1229 case -EPFNOSUPPORT:
1230 case -EPROTONOSUPPORT:
1231 case -EOPNOTSUPP:
1232 case -ECONNREFUSED:
1233 case -ECONNRESET:
1234 case -EHOSTDOWN:
1235 case -EHOSTUNREACH:
1236 case -ENETUNREACH:
1237 case -EADDRINUSE:
1238 case -ENOBUFS:
1239 case -EPIPE:
1240 case -EPERM:
7836d754
TM		 1241 case -EPROTO:
1242 case -ENODEV:
088f3e68 1243 *op_status = status = NFS4ERR_NXIO;
dd52128a
TM		 1244 break;
1245 case -EACCES:
088f3e68 1246 *op_status = status = NFS4ERR_ACCESS;
dd52128a
TM		 1247 break;
1248 default:
1249 return;
1250 }
1251 }
1252
194a0dc8
TM		 1253 mirror = FF_LAYOUT_COMP(lseg, idx);
1254 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1255 mirror, offset, length, status, opnum,
3e5f151e 1256 nfs_io_gfp_mask());
194a0dc8 1257
c22eeb86
PT		 1258 switch (status) {
1259 case NFS4ERR_DELAY:
1260 case NFS4ERR_GRACE:
c22eeb86 1261 break;
194a0dc8
TM		 1262 case NFS4ERR_NXIO:
1263 ff_layout_mark_ds_unreachable(lseg, idx);
563c53e7
TM		 1264 /*
1265 * Don't return the layout if this is a read and we still
1266 * have layouts to try
1267 */
1268 if (opnum == OP_READ)
1269 break;
df561f66 1270 fallthrough;
194a0dc8
TM		 1271 default:
1272 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1273 lseg);
c22eeb86
PT		 1274 }
1275
d67ae825
TH		 1276 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1277}
1278
1279/* NFS_PROTO call done callback routines */
d67ae825
TH		 1280static int ff_layout_read_done_cb(struct rpc_task *task,
1281 struct nfs_pgio_header *hdr)
1282{
d67ae825
TH		 1283 int err;
1284
088f3e68 1285 if (task->tk_status < 0) {
d67ae825
TH		 1286 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1287 hdr->args.offset, hdr->args.count,
088f3e68 1288 &hdr->res.op_status, OP_READ,
dd52128a 1289 task->tk_status);
088f3e68
TM		 1290 trace_ff_layout_read_error(hdr);
1291 }
1292
d67ae825
TH		 1293 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1294 hdr->ds_clp, hdr->lseg,
1295 hdr->pgio_mirror_idx);
1296
0722dc9f 1297 trace_nfs4_pnfs_read(hdr, err);
42f86b44
TM		 1298 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1299 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1300 switch (err) {
1301 case -NFS4ERR_RESET_TO_PNFS:
42f86b44 1302 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
d67ae825
TH		 1303 return task->tk_status;
1304 case -NFS4ERR_RESET_TO_MDS:
42f86b44 1305 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1306 return task->tk_status;
1307 case -EAGAIN:
13544412 1308 goto out_eagain;
d67ae825
TH		 1309 }
1310
1311 return 0;
13544412
TM		 1312out_eagain:
1313 rpc_restart_call_prepare(task);
1314 return -EAGAIN;
d67ae825
TH		 1315}
1316
c0f5f505
TM		 1317static bool
1318ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1319{
1320 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1321}
1322
d67ae825
TH		 1323/*
1324 * We reference the rpc_cred of the first WRITE that triggers the need for
1325 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1326 * rfc5661 is not clear about which credential should be used.
1327 *
1328 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1329 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1330 * we always send layoutcommit after DS writes.
1331 */
1332static void
bc28e1c2
TM		 1333ff_layout_set_layoutcommit(struct inode *inode,
1334 struct pnfs_layout_segment *lseg,
1335 loff_t end_offset)
d67ae825 1336{
bc28e1c2 1337 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1338 return;
1339
bc28e1c2
TM		 1340 pnfs_set_layoutcommit(inode, lseg, end_offset);
1341 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1342 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1343}
1344
37e9ed22
TM		 1345static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1346 struct nfs_pgio_header *hdr)
d67ae825 1347{
37e9ed22
TM		 1348 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1349 return;
0b7baf94 1350 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1351 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1352 hdr->args.count,
1353 task->tk_start);
37e9ed22
TM		 1354}
1355
1356static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1357 struct nfs_pgio_header *hdr)
1358{
1359 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1360 return;
1361 nfs4_ff_layout_stat_io_end_read(task,
1362 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1363 hdr->args.count,
1364 hdr->res.count);
056f9ad6 1365 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1366}
abcb7bfc 1367
37e9ed22
TM		 1368static int ff_layout_read_prepare_common(struct rpc_task *task,
1369 struct nfs_pgio_header *hdr)
1370{
d67ae825
TH		 1371 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1372 rpc_exit(task, -EIO);
1373 return -EIO;
1374 }
d67ae825 1375
37e9ed22 1376 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1377 return 0;
1378}
1379
1380/*
1381 * Call ops for the async read/write cases
1382 * In the case of dense layouts, the offset needs to be reset to its
1383 * original value.
1384 */
1385static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1386{
1387 struct nfs_pgio_header *hdr = data;
1388
1389 if (ff_layout_read_prepare_common(task, hdr))
1390 return;
1391
1392 rpc_call_start(task);
1393}
1394
d67ae825
TH		 1395static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1396{
1397 struct nfs_pgio_header *hdr = data;
1398
6de7e12f
AS		 1399 if (nfs4_setup_sequence(hdr->ds_clp,
1400 &hdr->args.seq_args,
1401 &hdr->res.seq_res,
1402 task))
d67ae825
TH		 1403 return;
1404
bb21ce0a 1405 ff_layout_read_prepare_common(task, hdr);
d67ae825
TH		 1406}
1407
1408static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1409{
1410 struct nfs_pgio_header *hdr = data;
1411
d67ae825
TH		 1412 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1413 task->tk_status == 0) {
1414 nfs4_sequence_done(task, &hdr->res.seq_res);
1415 return;
1416 }
1417
1418 /* Note this may cause RPC to be resent */
1419 hdr->mds_ops->rpc_call_done(task, hdr);
1420}
1421
1422static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1423{
1424 struct nfs_pgio_header *hdr = data;
1425
37e9ed22 1426 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1427 rpc_count_iostats_metrics(task,
1428 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1429}
1430
4d0ac221
TM		 1431static void ff_layout_read_release(void *data)
1432{
1433 struct nfs_pgio_header *hdr = data;
1434
1435 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
563c53e7
TM		 1436 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1437 ff_layout_resend_pnfs_read(hdr);
1438 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
42f86b44 1439 ff_layout_reset_read(hdr);
4d0ac221
TM		 1440 pnfs_generic_rw_release(data);
1441}
1442
1443
d67ae825
TH		 1444static int ff_layout_write_done_cb(struct rpc_task *task,
1445 struct nfs_pgio_header *hdr)
1446{
2e18d4d8 1447 loff_t end_offs = 0;
d67ae825
TH		 1448 int err;
1449
088f3e68 1450 if (task->tk_status < 0) {
d67ae825
TH		 1451 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1452 hdr->args.offset, hdr->args.count,
088f3e68 1453 &hdr->res.op_status, OP_WRITE,
dd52128a 1454 task->tk_status);
088f3e68
TM		 1455 trace_ff_layout_write_error(hdr);
1456 }
1457
d67ae825
TH		 1458 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1459 hdr->ds_clp, hdr->lseg,
1460 hdr->pgio_mirror_idx);
1461
0722dc9f 1462 trace_nfs4_pnfs_write(hdr, err);
7b0df92a
TM		 1463 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1464 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1465 switch (err) {
1466 case -NFS4ERR_RESET_TO_PNFS:
7b0df92a 1467 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
7cc8c5cd 1468 return task->tk_status;
d67ae825 1469 case -NFS4ERR_RESET_TO_MDS:
7b0df92a 1470 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1471 return task->tk_status;
1472 case -EAGAIN:
d67ae825
TH		 1473 return -EAGAIN;
1474 }
1475
1476 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1477 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1478 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1479
1480 /* Note: if the write is unstable, don't set end_offs until commit */
1481 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1482
54204010
PT		 1483 /* zero out fattr since we don't care DS attr at all */
1484 hdr->fattr.valid = 0;
69f230d9
PT		 1485 if (task->tk_status >= 0)
1486 nfs_writeback_update_inode(hdr);
1487
d67ae825
TH		 1488 return 0;
1489}
1490
1491static int ff_layout_commit_done_cb(struct rpc_task *task,
1492 struct nfs_commit_data *data)
1493{
d67ae825
TH		 1494 int err;
1495
088f3e68 1496 if (task->tk_status < 0) {
d67ae825
TH		 1497 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1498 data->args.offset, data->args.count,
088f3e68 1499 &data->res.op_status, OP_COMMIT,
dd52128a 1500 task->tk_status);
088f3e68
TM		 1501 trace_ff_layout_commit_error(data);
1502 }
1503
d67ae825
TH		 1504 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1505 data->lseg, data->ds_commit_index);
1506
0722dc9f 1507 trace_nfs4_pnfs_commit_ds(data, err);
d67ae825
TH		 1508 switch (err) {
1509 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1510 pnfs_generic_prepare_to_resend_writes(data);
1511 return -EAGAIN;
d67ae825 1512 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1513 pnfs_generic_prepare_to_resend_writes(data);
1514 return -EAGAIN;
1515 case -EAGAIN:
1516 rpc_restart_call_prepare(task);
1517 return -EAGAIN;
1518 }
1519
bc28e1c2 1520 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1521
1522 return 0;
1523}
1524
37e9ed22
TM		 1525static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1526 struct nfs_pgio_header *hdr)
d67ae825 1527{
37e9ed22
TM		 1528 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1529 return;
0b7baf94 1530 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1531 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1532 hdr->args.count,
1533 task->tk_start);
37e9ed22
TM		 1534}
1535
1536static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1537 struct nfs_pgio_header *hdr)
1538{
1539 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1540 return;
1541 nfs4_ff_layout_stat_io_end_write(task,
1542 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1543 hdr->args.count, hdr->res.count,
1544 hdr->res.verf->committed);
056f9ad6 1545 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1546}
abcb7bfc 1547
37e9ed22
TM		 1548static int ff_layout_write_prepare_common(struct rpc_task *task,
1549 struct nfs_pgio_header *hdr)
1550{
d67ae825
TH		 1551 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1552 rpc_exit(task, -EIO);
1553 return -EIO;
1554 }
1555
37e9ed22 1556 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1557 return 0;
1558}
1559
1560static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1561{
1562 struct nfs_pgio_header *hdr = data;
1563
1564 if (ff_layout_write_prepare_common(task, hdr))
1565 return;
1566
1567 rpc_call_start(task);
1568}
1569
1570static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1571{
1572 struct nfs_pgio_header *hdr = data;
1573
6de7e12f
AS		 1574 if (nfs4_setup_sequence(hdr->ds_clp,
1575 &hdr->args.seq_args,
1576 &hdr->res.seq_res,
1577 task))
d67ae825
TH		 1578 return;
1579
bb21ce0a 1580 ff_layout_write_prepare_common(task, hdr);
d67ae825
TH		 1581}
1582
1583static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1584{
1585 struct nfs_pgio_header *hdr = data;
1586
1587 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1588 task->tk_status == 0) {
1589 nfs4_sequence_done(task, &hdr->res.seq_res);
1590 return;
1591 }
1592
1593 /* Note this may cause RPC to be resent */
1594 hdr->mds_ops->rpc_call_done(task, hdr);
1595}
1596
1597static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1598{
1599 struct nfs_pgio_header *hdr = data;
1600
37e9ed22 1601 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1602 rpc_count_iostats_metrics(task,
1603 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1604}
1605
4d0ac221
TM		 1606static void ff_layout_write_release(void *data)
1607{
1608 struct nfs_pgio_header *hdr = data;
1609
1610 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
f0922a6c
TM		 1611 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1612 ff_layout_send_layouterror(hdr->lseg);
7b0df92a 1613 ff_layout_reset_write(hdr, true);
f0922a6c 1614 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
7b0df92a 1615 ff_layout_reset_write(hdr, false);
4d0ac221
TM		 1616 pnfs_generic_rw_release(data);
1617}
1618
37e9ed22 1619static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1620 struct nfs_commit_data *cdata)
1621{
37e9ed22
TM		 1622 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1623 return;
0b7baf94 1624 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1625 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1626 0, task->tk_start);
abcb7bfc
TM		 1627}
1628
37e9ed22
TM		 1629static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1630 struct nfs_commit_data *cdata)
1631{
1632 struct nfs_page *req;
1633 __u64 count = 0;
1634
1635 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1636 return;
1637
1638 if (task->tk_status == 0) {
1639 list_for_each_entry(req, &cdata->pages, wb_list)
1640 count += req->wb_bytes;
1641 }
1642 nfs4_ff_layout_stat_io_end_write(task,
1643 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1644 count, count, NFS_FILE_SYNC);
056f9ad6 1645 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
37e9ed22
TM		 1646}
1647
1648static void ff_layout_commit_prepare_common(struct rpc_task *task,
1649 struct nfs_commit_data *cdata)
1650{
1651 ff_layout_commit_record_layoutstats_start(task, cdata);
1652}
1653
d67ae825
TH		 1654static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1655{
abcb7bfc 1656 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1657 rpc_call_start(task);
1658}
1659
1660static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1661{
1662 struct nfs_commit_data *wdata = data;
1663
6de7e12f
AS		 1664 if (nfs4_setup_sequence(wdata->ds_clp,
1665 &wdata->args.seq_args,
1666 &wdata->res.seq_res,
1667 task))
abcb7bfc
TM		 1668 return;
1669 ff_layout_commit_prepare_common(task, data);
1670}
1671
1672static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1673{
1674 pnfs_generic_write_commit_done(task, data);
1675}
1676
1677static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1678{
1679 struct nfs_commit_data *cdata = data;
abcb7bfc 1680
37e9ed22 1681 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1682 rpc_count_iostats_metrics(task,
1683 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1684}
1685
4d0ac221
TM		 1686static void ff_layout_commit_release(void *data)
1687{
1688 struct nfs_commit_data *cdata = data;
1689
1690 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1691 pnfs_generic_commit_release(data);
1692}
1693
d67ae825
TH		 1694static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1695 .rpc_call_prepare = ff_layout_read_prepare_v3,
1696 .rpc_call_done = ff_layout_read_call_done,
1697 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1698 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1699};
1700
1701static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1702 .rpc_call_prepare = ff_layout_read_prepare_v4,
1703 .rpc_call_done = ff_layout_read_call_done,
1704 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1705 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1706};
1707
1708static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1709 .rpc_call_prepare = ff_layout_write_prepare_v3,
1710 .rpc_call_done = ff_layout_write_call_done,
1711 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1712 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1713};
1714
1715static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1716 .rpc_call_prepare = ff_layout_write_prepare_v4,
1717 .rpc_call_done = ff_layout_write_call_done,
1718 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1719 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1720};
1721
1722static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1723 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1724 .rpc_call_done = ff_layout_commit_done,
d67ae825 1725 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1726 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1727};
1728
1729static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1730 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1731 .rpc_call_done = ff_layout_commit_done,
d67ae825 1732 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1733 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1734};
1735
1736static enum pnfs_try_status
1737ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1738{
1739 struct pnfs_layout_segment *lseg = hdr->lseg;
1740 struct nfs4_pnfs_ds *ds;
1741 struct rpc_clnt *ds_clnt;
2444ff27 1742 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1743 const struct cred *ds_cred;
d67ae825
TH		 1744 loff_t offset = hdr->args.offset;
1745 u32 idx = hdr->pgio_mirror_idx;
1746 int vers;
1747 struct nfs_fh *fh;
1748
5b5e0928 1749 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
d67ae825
TH		 1750 __func__, hdr->inode->i_ino,
1751 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1752
2444ff27
TM		 1753 mirror = FF_LAYOUT_COMP(lseg, idx);
1754 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
d67ae825
TH		 1755 if (!ds)
1756 goto out_failed;
1757
561d6f8a 1758 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1759 hdr->inode);
1760 if (IS_ERR(ds_clnt))
1761 goto out_failed;
1762
312cd4cb 1763 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
57f3f4c0 1764 if (!ds_cred)
d67ae825
TH		 1765 goto out_failed;
1766
626d48b1 1767 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825
TH		 1768
1769 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
212bf41d 1770 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
d67ae825 1771
75bf47eb 1772 hdr->pgio_done_cb = ff_layout_read_done_cb;
212bf41d 1773 refcount_inc(&ds->ds_clp->cl_count);
d67ae825 1774 hdr->ds_clp = ds->ds_clp;
749da527 1775 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1776 if (fh)
1777 hdr->args.fh = fh;
bb21ce0a 1778
4cbc8a57 1779 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
bb21ce0a 1780
d67ae825
TH		 1781 /*
1782 * Note that if we ever decide to split across DSes,
1783 * then we may need to handle dense-like offsets.
1784 */
1785 hdr->args.offset = offset;
1786 hdr->mds_offset = offset;
1787
1788 /* Perform an asynchronous read to ds */
1789 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1790 vers == 3 ? &ff_layout_read_call_ops_v3 :
1791 &ff_layout_read_call_ops_v4,
1792 0, RPC_TASK_SOFTCONN);
a52458b4 1793 put_cred(ds_cred);
d67ae825
TH		 1794 return PNFS_ATTEMPTED;
1795
1796out_failed:
3b13b4b3 1797 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825 1798 return PNFS_TRY_AGAIN;
d5b9216f
TM		 1799 trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1800 hdr->args.offset, hdr->args.count,
1801 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
d67ae825
TH		 1802 return PNFS_NOT_ATTEMPTED;
1803}
1804
1805/* Perform async writes. */
1806static enum pnfs_try_status
1807ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1808{
1809 struct pnfs_layout_segment *lseg = hdr->lseg;
1810 struct nfs4_pnfs_ds *ds;
1811 struct rpc_clnt *ds_clnt;
2444ff27 1812 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1813 const struct cred *ds_cred;
d67ae825
TH		 1814 loff_t offset = hdr->args.offset;
1815 int vers;
1816 struct nfs_fh *fh;
b9df46d0 1817 u32 idx = hdr->pgio_mirror_idx;
d67ae825 1818
2444ff27
TM		 1819 mirror = FF_LAYOUT_COMP(lseg, idx);
1820 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825 1821 if (!ds)
37f8aa16 1822 goto out_failed;
d67ae825 1823
561d6f8a 1824 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1825 hdr->inode);
1826 if (IS_ERR(ds_clnt))
37f8aa16 1827 goto out_failed;
d67ae825 1828
312cd4cb 1829 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
57f3f4c0 1830 if (!ds_cred)
37f8aa16 1831 goto out_failed;
d67ae825 1832
626d48b1 1833 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825 1834
5b5e0928 1835 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
d67ae825 1836 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
212bf41d 1837 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1838 vers);
1839
1840 hdr->pgio_done_cb = ff_layout_write_done_cb;
212bf41d 1841 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1842 hdr->ds_clp = ds->ds_clp;
1843 hdr->ds_commit_idx = idx;
749da527 1844 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1845 if (fh)
1846 hdr->args.fh = fh;
1847
4cbc8a57 1848 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
bb21ce0a 1849
d67ae825
TH		 1850 /*
1851 * Note that if we ever decide to split across DSes,
1852 * then we may need to handle dense-like offsets.
1853 */
1854 hdr->args.offset = offset;
1855
1856 /* Perform an asynchronous write */
1857 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1858 vers == 3 ? &ff_layout_write_call_ops_v3 :
1859 &ff_layout_write_call_ops_v4,
1860 sync, RPC_TASK_SOFTCONN);
a52458b4 1861 put_cred(ds_cred);
d67ae825 1862 return PNFS_ATTEMPTED;
37f8aa16
TM		 1863
1864out_failed:
1865 if (ff_layout_avoid_mds_available_ds(lseg))
1866 return PNFS_TRY_AGAIN;
d5b9216f
TM		 1867 trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1868 hdr->args.offset, hdr->args.count,
1869 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
37f8aa16 1870 return PNFS_NOT_ATTEMPTED;
d67ae825
TH		 1871}
1872
d67ae825
TH		 1873static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1874{
1875 return i;
1876}
1877
1878static struct nfs_fh *
1879select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1880{
1881 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1882
1883 /* FIXME: Assume that there is only one NFS version available
1884 * for the DS.
1885 */
1886 return &flseg->mirror_array[i]->fh_versions[0];
1887}
1888
1889static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1890{
1891 struct pnfs_layout_segment *lseg = data->lseg;
1892 struct nfs4_pnfs_ds *ds;
1893 struct rpc_clnt *ds_clnt;
2444ff27 1894 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1895 const struct cred *ds_cred;
d67ae825 1896 u32 idx;
57f3f4c0 1897 int vers, ret;
d67ae825
TH		 1898 struct nfs_fh *fh;
1899
4b75053e
TM		 1900 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1901 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1902 goto out_err;
1903
d67ae825 1904 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
2444ff27
TM		 1905 mirror = FF_LAYOUT_COMP(lseg, idx);
1906 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825
TH		 1907 if (!ds)
1908 goto out_err;
1909
561d6f8a 1910 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1911 data->inode);
1912 if (IS_ERR(ds_clnt))
1913 goto out_err;
1914
312cd4cb 1915 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
57f3f4c0 1916 if (!ds_cred)
d67ae825
TH		 1917 goto out_err;
1918
626d48b1 1919 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825
TH		 1920
1921 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
212bf41d 1922 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1923 vers);
1924 data->commit_done_cb = ff_layout_commit_done_cb;
1925 data->cred = ds_cred;
212bf41d 1926 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1927 data->ds_clp = ds->ds_clp;
1928 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1929 if (fh)
1930 data->args.fh = fh;
abcb7bfc 1931
57f3f4c0 1932 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1933 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1934 &ff_layout_commit_call_ops_v4,
1935 how, RPC_TASK_SOFTCONN);
a52458b4 1936 put_cred(ds_cred);
57f3f4c0 1937 return ret;
d67ae825
TH		 1938out_err:
1939 pnfs_generic_prepare_to_resend_writes(data);
1940 pnfs_generic_commit_release(data);
1941 return -EAGAIN;
1942}
1943
1944static int
1945ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1946 int how, struct nfs_commit_info *cinfo)
1947{
1948 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1949 ff_layout_initiate_commit);
1950}
1951
1952static struct pnfs_ds_commit_info *
1953ff_layout_get_ds_info(struct inode *inode)
1954{
1955 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1956
1957 if (layout == NULL)
1958 return NULL;
1959
1960 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1961}
1962
ba827c9a
TM		 1963static void
1964ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1965 struct pnfs_layout_segment *lseg)
1966{
1967 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1968 struct inode *inode = lseg->pls_layout->plh_inode;
1969 struct pnfs_commit_array *array, *new;
1970
3e5f151e
TM		 1971 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt,
1972 nfs_io_gfp_mask());
ba827c9a
TM		 1973 if (new) {
1974 spin_lock(&inode->i_lock);
1975 array = pnfs_add_commit_array(fl_cinfo, new, lseg);
1976 spin_unlock(&inode->i_lock);
1977 if (array != new)
1978 pnfs_free_commit_array(new);
1979 }
1980}
1981
a9901899
TM		 1982static void
1983ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
1984 struct inode *inode)
1985{
1986 spin_lock(&inode->i_lock);
1987 pnfs_generic_ds_cinfo_destroy(fl_cinfo);
1988 spin_unlock(&inode->i_lock);
1989}
1990
d67ae825 1991static void
fc87701b 1992ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1993{
1994 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1995 id_node));
1996}
1997
5ba6a09e 1998static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
5b9b3c85
TM		 1999 const struct nfs4_layoutreturn_args *args,
2000 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 2001{
d67ae825 2002 __be32 *start;
d67ae825
TH		 2003
2004 start = xdr_reserve_space(xdr, 4);
2005 if (unlikely(!start))
2006 return -E2BIG;
2007
5b9b3c85 2008 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 2009 /* This assume we always return _ALL_ layouts */
5b9b3c85 2010 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 2011}
2012
230bc962
TM		 2013static void
2014encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2015{
ab6e9aaf 2016 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
230bc962
TM		 2017}
2018
2019static void
2020ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2021 const nfs4_stateid *stateid,
2022 const struct nfs42_layoutstat_devinfo *devinfo)
2023{
2024 __be32 *p;
2025
2026 p = xdr_reserve_space(xdr, 8 + 8);
2027 p = xdr_encode_hyper(p, devinfo->offset);
2028 p = xdr_encode_hyper(p, devinfo->length);
2029 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2030 p = xdr_reserve_space(xdr, 4*8);
2031 p = xdr_encode_hyper(p, devinfo->read_count);
2032 p = xdr_encode_hyper(p, devinfo->read_bytes);
2033 p = xdr_encode_hyper(p, devinfo->write_count);
2034 p = xdr_encode_hyper(p, devinfo->write_bytes);
2035 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2036}
2037
2038static void
2039ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2040 const nfs4_stateid *stateid,
2041 const struct nfs42_layoutstat_devinfo *devinfo)
2042{
2043 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2044 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2045 devinfo->ld_private.data);
2046}
2047
d67ae825 2048/* report nothing for now */
230bc962
TM		 2049static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2050 const struct nfs4_layoutreturn_args *args,
2051 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 2052{
2053 __be32 *p;
230bc962 2054 int i;
d67ae825
TH		 2055
2056 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 2057 *p = cpu_to_be32(ff_args->num_dev);
2058 for (i = 0; i < ff_args->num_dev; i++)
2059 ff_layout_encode_ff_iostat(xdr,
2060 &args->layout->plh_stateid,
2061 &ff_args->devinfo[i]);
2062}
2063
2064static void
2065ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2066 unsigned int num_entries)
2067{
2068 unsigned int i;
2069
2070 for (i = 0; i < num_entries; i++) {
2071 if (!devinfo[i].ld_private.ops)
2072 continue;
2073 if (!devinfo[i].ld_private.ops->free)
2074 continue;
2075 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2076 }
d67ae825
TH		 2077}
2078
2079static struct nfs4_deviceid_node *
2080ff_layout_alloc_deviceid_node(struct nfs_server *server,
2081 struct pnfs_device *pdev, gfp_t gfp_flags)
2082{
2083 struct nfs4_ff_layout_ds *dsaddr;
2084
2085 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2086 if (!dsaddr)
2087 return NULL;
2088 return &dsaddr->id_node;
2089}
2090
2091static void
94e5c571 2092ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2093 const void *voidargs,
2094 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2095{
5b9b3c85 2096 const struct nfs4_layoutreturn_args *args = voidargs;
5ba6a09e 2097 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
d9152114
TM		 2098 struct xdr_buf tmp_buf = {
2099 .head = {
2100 [0] = {
2101 .iov_base = page_address(ff_args->pages[0]),
2102 },
2103 },
2104 .buflen = PAGE_SIZE,
2105 };
2106 struct xdr_stream tmp_xdr;
d67ae825
TH		 2107 __be32 *start;
2108
2109 dprintk("%s: Begin\n", __func__);
d67ae825 2110
0ccc61b1 2111 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
d9152114
TM		 2112
2113 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2114 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2115
2116 start = xdr_reserve_space(xdr, 4);
2117 *start = cpu_to_be32(tmp_buf.len);
2118 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
082fa37d 2119
d67ae825
TH		 2120 dprintk("%s: Return\n", __func__);
2121}
2122
5b9b3c85
TM		 2123static void
2124ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2125{
2126 struct nfs4_flexfile_layoutreturn_args *ff_args;
2127
2128 if (!args->data)
2129 return;
2130 ff_args = args->data;
2131 args->data = NULL;
2132
2133 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2134 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85 2135
d9152114 2136 put_page(ff_args->pages[0]);
5b9b3c85
TM		 2137 kfree(ff_args);
2138}
2139
2e54b9b1 2140static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
5b9b3c85
TM		 2141 .encode = ff_layout_encode_layoutreturn,
2142 .free = ff_layout_free_layoutreturn,
2143};
2144
2145static int
2146ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2147{
2148 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2149 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85 2150
3e5f151e 2151 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask());
5b9b3c85 2152 if (!ff_args)
d9152114 2153 goto out_nomem;
3e5f151e 2154 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
d9152114
TM		 2155 if (!ff_args->pages[0])
2156 goto out_nomem_free;
5b9b3c85
TM		 2157
2158 INIT_LIST_HEAD(&ff_args->errors);
2159 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2160 &args->range, &ff_args->errors,
2161 FF_LAYOUTRETURN_MAXERR);
2162
230bc962
TM		 2163 spin_lock(&args->inode->i_lock);
2164 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2165 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2166 spin_unlock(&args->inode->i_lock);
2167
5b9b3c85
TM		 2168 args->ld_private->ops = &layoutreturn_ops;
2169 args->ld_private->data = ff_args;
2170 return 0;
d9152114
TM		 2171out_nomem_free:
2172 kfree(ff_args);
2173out_nomem:
2174 return -ENOMEM;
5b9b3c85
TM		 2175}
2176
f0922a6c
TM		 2177#ifdef CONFIG_NFS_V4_2
2178void
2179ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2180{
2181 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2182 struct nfs42_layout_error *errors;
2183 LIST_HEAD(head);
2184
2185 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2186 return;
2187 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2188 if (list_empty(&head))
2189 return;
2190
61345a42 2191 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors),
3e5f151e 2192 nfs_io_gfp_mask());
f0922a6c
TM		 2193 if (errors != NULL) {
2194 const struct nfs4_ff_layout_ds_err *pos;
2195 size_t n = 0;
2196
2197 list_for_each_entry(pos, &head, list) {
2198 errors[n].offset = pos->offset;
2199 errors[n].length = pos->length;
2200 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2201 errors[n].errors[0].dev_id = pos->deviceid;
2202 errors[n].errors[0].status = pos->status;
2203 errors[n].errors[0].opnum = pos->opnum;
2204 n++;
2205 if (!list_is_last(&pos->list, &head) &&
2206 n < NFS42_LAYOUTERROR_MAX)
2207 continue;
2208 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2209 break;
2210 n = 0;
2211 }
2212 kfree(errors);
2213 }
2214 ff_layout_free_ds_ioerr(&head);
2215}
2216#else
2217void
2218ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2219{
2220}
2221#endif
2222
27c43064
PT		 2223static int
2224ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2225{
2226 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2227
2228 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2229}
2230
2231static size_t
2232ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2233 const int buflen)
2234{
2235 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2236 const struct in6_addr *addr = &sin6->sin6_addr;
2237
2238 /*
2239 * RFC 4291, Section 2.2.2
2240 *
2241 * Shorthanded ANY address
2242 */
2243 if (ipv6_addr_any(addr))
2244 return snprintf(buf, buflen, "::");
2245
2246 /*
2247 * RFC 4291, Section 2.2.2
2248 *
2249 * Shorthanded loopback address
2250 */
2251 if (ipv6_addr_loopback(addr))
2252 return snprintf(buf, buflen, "::1");
2253
2254 /*
2255 * RFC 4291, Section 2.2.3
2256 *
2257 * Special presentation address format for mapped v4
2258 * addresses.
2259 */
2260 if (ipv6_addr_v4mapped(addr))
2261 return snprintf(buf, buflen, "::ffff:%pI4",
2262 &addr->s6_addr32[3]);
2263
2264 /*
2265 * RFC 4291, Section 2.2.1
2266 */
2267 return snprintf(buf, buflen, "%pI6c", addr);
2268}
2269
2270/* Derived from rpc_sockaddr2uaddr */
2271static void
2272ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2273{
2274 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2275 char portbuf[RPCBIND_MAXUADDRPLEN];
2276 char addrbuf[RPCBIND_MAXUADDRLEN];
27c43064
PT		 2277 unsigned short port;
2278 int len, netid_len;
2279 __be32 *p;
2280
2281 switch (sap->sa_family) {
2282 case AF_INET:
2283 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2284 return;
2285 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
27c43064
PT		 2286 break;
2287 case AF_INET6:
2288 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2289 return;
2290 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
27c43064
PT		 2291 break;
2292 default:
27c43064
PT		 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
9a701631 2300 netid_len = strlen(da->da_netid);
27c43064 2301 p = xdr_reserve_space(xdr, 4 + netid_len);
9a701631 2302 xdr_encode_opaque(p, da->da_netid, netid_len);
27c43064
PT		 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 */
61345a42 2443 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo),
3e5f151e 2444 nfs_io_gfp_mask());
ad4dc53e
PT		 2445 if (!args->devinfo)
2446 return -ENOMEM;
2447
ad4dc53e 2448 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2449 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2450 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2451 &args->devinfo[0], dev_count);
ad4dc53e 2452 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2453 if (!args->num_dev) {
2454 kfree(args->devinfo);
2455 args->devinfo = NULL;
2456 return -ENOENT;
2457 }
ad4dc53e
PT		 2458
2459 return 0;
2460}
2461
76b2a303
TM		 2462static int
2463ff_layout_set_layoutdriver(struct nfs_server *server,
2464 const struct nfs_fh *dummy)
2465{
2466#if IS_ENABLED(CONFIG_NFS_V4_2)
2467 server->caps |= NFS_CAP_LAYOUTSTATS;
2468#endif
2469 return 0;
2470}
2471
9c455a8c
TM		 2472static const struct pnfs_commit_ops ff_layout_commit_ops = {
2473 .setup_ds_info = ff_layout_setup_ds_info,
2474 .release_ds_info = ff_layout_release_ds_info,
2475 .mark_request_commit = pnfs_layout_mark_request_commit,
2476 .clear_request_commit = pnfs_generic_clear_request_commit,
2477 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2478 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2479 .commit_pagelist = ff_layout_commit_pagelist,
2480};
2481
d67ae825
TH		 2482static struct pnfs_layoutdriver_type flexfilelayout_type = {
2483 .id = LAYOUT_FLEX_FILES,
2484 .name = "LAYOUT_FLEX_FILES",
2485 .owner = THIS_MODULE,
f86c3ac5 2486 .flags = PNFS_LAYOUTGET_ON_OPEN,
28ced9a8 2487 .max_layoutget_response = 4096, /* 1 page or so... */
76b2a303 2488 .set_layoutdriver = ff_layout_set_layoutdriver,
d67ae825
TH		 2489 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2490 .free_layout_hdr = ff_layout_free_layout_hdr,
2491 .alloc_lseg = ff_layout_alloc_lseg,
2492 .free_lseg = ff_layout_free_lseg,
0762ed2c 2493 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2494 .pg_read_ops = &ff_layout_pg_read_ops,
2495 .pg_write_ops = &ff_layout_pg_write_ops,
2496 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2497 .free_deviceid_node = ff_layout_free_deviceid_node,
d67ae825
TH		 2498 .read_pagelist = ff_layout_read_pagelist,
2499 .write_pagelist = ff_layout_write_pagelist,
2500 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2501 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2502 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2503 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2504};
2505
2506static int __init nfs4flexfilelayout_init(void)
2507{
2508 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2509 __func__);
2510 return pnfs_register_layoutdriver(&flexfilelayout_type);
2511}
2512
2513static void __exit nfs4flexfilelayout_exit(void)
2514{
2515 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2516 __func__);
2517 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2518}
2519
2520MODULE_ALIAS("nfs-layouttype4-4");
2521
2522MODULE_LICENSE("GPL");
2523MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2524
2525module_init(nfs4flexfilelayout_init);
2526module_exit(nfs4flexfilelayout_exit);
33344e0f
TM		 2527
2528module_param(io_maxretrans, ushort, 0644);
2529MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
2530 "retries an I/O request before returning an error. ");
Michael's Linux tree.