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[linux-2.6-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>
11#include <linux/nfs_page.h>
12#include <linux/module.h>
97f68c6b 13#include <linux/sched/mm.h>
d67ae825
TH		 14
15#include <linux/sunrpc/metrics.h>
d67ae825
TH		 16
17#include "flexfilelayout.h"
18#include "../nfs4session.h"
40c64c26 19#include "../nfs4idmap.h"
d67ae825
TH		 20#include "../internal.h"
21#include "../delegation.h"
22#include "../nfs4trace.h"
23#include "../iostat.h"
24#include "../nfs.h"
ad4dc53e 25#include "../nfs42.h"
d67ae825
TH		 26
27#define NFSDBG_FACILITY NFSDBG_PNFS_LD
28
29#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
5b9b3c85
TM		 30#define FF_LAYOUTRETURN_MAXERR 20
31
33344e0f
TM		 32static unsigned short io_maxretrans;
33
54e4a0df
TM		 34static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
35 struct nfs_pgio_header *hdr);
230bc962
TM		 36static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
37 struct nfs42_layoutstat_devinfo *devinfo,
38 int dev_limit);
39static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
40 const struct nfs42_layoutstat_devinfo *devinfo,
41 struct nfs4_ff_layout_mirror *mirror);
54e4a0df 42
d67ae825
TH		 43static struct pnfs_layout_hdr *
44ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
45{
46 struct nfs4_flexfile_layout *ffl;
47
48 ffl = kzalloc(sizeof(*ffl), gfp_flags);
49 if (ffl) {
50 INIT_LIST_HEAD(&ffl->error_list);
266d12d4 51 INIT_LIST_HEAD(&ffl->mirrors);
1c8d477a 52 ffl->last_report_time = ktime_get();
d67ae825
TH		 53 return &ffl->generic_hdr;
54 } else
55 return NULL;
56}
57
58static void
59ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
60{
61 struct nfs4_ff_layout_ds_err *err, *n;
62
63 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
64 list) {
65 list_del(&err->list);
66 kfree(err);
67 }
68 kfree(FF_LAYOUT_FROM_HDR(lo));
69}
70
93b717fd 71static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
d67ae825
TH		 72{
73 __be32 *p;
74
75 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
76 if (unlikely(p == NULL))
77 return -ENOBUFS;
93b717fd
TM		 78 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
79 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
d67ae825
TH		 80 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
81 p[0], p[1], p[2], p[3]);
82 return 0;
83}
84
85static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
86{
87 __be32 *p;
88
89 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
90 if (unlikely(!p))
91 return -ENOBUFS;
92 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
93 nfs4_print_deviceid(devid);
94 return 0;
95}
96
97static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
98{
99 __be32 *p;
100
101 p = xdr_inline_decode(xdr, 4);
102 if (unlikely(!p))
103 return -ENOBUFS;
104 fh->size = be32_to_cpup(p++);
105 if (fh->size > sizeof(struct nfs_fh)) {
106 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
107 fh->size);
108 return -EOVERFLOW;
109 }
110 /* fh.data */
111 p = xdr_inline_decode(xdr, fh->size);
112 if (unlikely(!p))
113 return -ENOBUFS;
114 memcpy(&fh->data, p, fh->size);
115 dprintk("%s: fh len %d\n", __func__, fh->size);
116
117 return 0;
118}
119
120/*
121 * Currently only stringified uids and gids are accepted.
122 * I.e., kerberos is not supported to the DSes, so no pricipals.
123 *
124 * That means that one common function will suffice, but when
125 * principals are added, this should be split to accomodate
126 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
127 */
128static int
129decode_name(struct xdr_stream *xdr, u32 *id)
130{
131 __be32 *p;
132 int len;
133
134 /* opaque_length(4)*/
135 p = xdr_inline_decode(xdr, 4);
136 if (unlikely(!p))
137 return -ENOBUFS;
138 len = be32_to_cpup(p++);
139 if (len < 0)
140 return -EINVAL;
141
142 dprintk("%s: len %u\n", __func__, len);
143
144 /* opaque body */
145 p = xdr_inline_decode(xdr, len);
146 if (unlikely(!p))
147 return -ENOBUFS;
148
149 if (!nfs_map_string_to_numeric((char *)p, len, id))
150 return -EINVAL;
151
152 return 0;
153}
154
266d12d4
TM		 155static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
156 const struct nfs4_ff_layout_mirror *m2)
157{
158 int i, j;
159
160 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
161 return false;
162 for (i = 0; i < m1->fh_versions_cnt; i++) {
163 bool found_fh = false;
86fb449b 164 for (j = 0; j < m2->fh_versions_cnt; j++) {
266d12d4
TM		 165 if (nfs_compare_fh(&m1->fh_versions[i],
166 &m2->fh_versions[j]) == 0) {
167 found_fh = true;
168 break;
169 }
170 }
171 if (!found_fh)
172 return false;
173 }
174 return true;
175}
176
177static struct nfs4_ff_layout_mirror *
178ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
179 struct nfs4_ff_layout_mirror *mirror)
180{
181 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
182 struct nfs4_ff_layout_mirror *pos;
183 struct inode *inode = lo->plh_inode;
184
185 spin_lock(&inode->i_lock);
186 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
65990d1a 187 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
266d12d4
TM		 188 continue;
189 if (!ff_mirror_match_fh(mirror, pos))
190 continue;
81a090b9 191 if (refcount_inc_not_zero(&pos->ref)) {
266d12d4
TM		 192 spin_unlock(&inode->i_lock);
193 return pos;
194 }
195 }
196 list_add(&mirror->mirrors, &ff_layout->mirrors);
197 mirror->layout = lo;
198 spin_unlock(&inode->i_lock);
199 return mirror;
200}
201
e3b1df2d 202static void
266d12d4
TM		 203ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
204{
205 struct inode *inode;
206 if (mirror->layout == NULL)
207 return;
208 inode = mirror->layout->plh_inode;
209 spin_lock(&inode->i_lock);
210 list_del(&mirror->mirrors);
211 spin_unlock(&inode->i_lock);
212 mirror->layout = NULL;
213}
214
28a0d72c
TM		 215static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
216{
217 struct nfs4_ff_layout_mirror *mirror;
218
219 mirror = kzalloc(sizeof(*mirror), gfp_flags);
220 if (mirror != NULL) {
221 spin_lock_init(&mirror->lock);
81a090b9 222 refcount_set(&mirror->ref, 1);
266d12d4 223 INIT_LIST_HEAD(&mirror->mirrors);
28a0d72c
TM		 224 }
225 return mirror;
226}
227
228static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
229{
a52458b4 230 const struct cred *cred;
3064b686 231
266d12d4 232 ff_layout_remove_mirror(mirror);
28a0d72c 233 kfree(mirror->fh_versions);
3064b686 234 cred = rcu_access_pointer(mirror->ro_cred);
a52458b4 235 put_cred(cred);
3064b686 236 cred = rcu_access_pointer(mirror->rw_cred);
a52458b4 237 put_cred(cred);
28a0d72c
TM		 238 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
239 kfree(mirror);
240}
241
242static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
243{
81a090b9 244 if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
28a0d72c
TM		 245 ff_layout_free_mirror(mirror);
246}
247
d67ae825
TH		 248static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
249{
250 int i;
251
252 if (fls->mirror_array) {
253 for (i = 0; i < fls->mirror_array_cnt; i++) {
254 /* normally mirror_ds is freed in
255 * .free_deviceid_node but we still do it here
256 * for .alloc_lseg error path */
28a0d72c 257 ff_layout_put_mirror(fls->mirror_array[i]);
d67ae825
TH		 258 }
259 kfree(fls->mirror_array);
260 fls->mirror_array = NULL;
261 }
262}
263
264static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
265{
266 int ret = 0;
267
268 dprintk("--> %s\n", __func__);
269
270 /* FIXME: remove this check when layout segment support is added */
271 if (lgr->range.offset != 0 ||
272 lgr->range.length != NFS4_MAX_UINT64) {
273 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
274 __func__);
275 ret = -EINVAL;
276 }
277
278 dprintk("--> %s returns %d\n", __func__, ret);
279 return ret;
280}
281
282static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
283{
284 if (fls) {
285 ff_layout_free_mirror_array(fls);
286 kfree(fls);
287 }
288}
289
0762ed2c
TM		 290static bool
291ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
292 const struct pnfs_layout_range *l2)
293{
294 u64 end1, end2;
295
296 if (l1->iomode != l2->iomode)
297 return l1->iomode != IOMODE_READ;
298 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
299 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
300 if (end1 < l2->offset)
301 return false;
302 if (end2 < l1->offset)
303 return true;
304 return l2->offset <= l1->offset;
305}
306
307static bool
308ff_lseg_merge(struct pnfs_layout_segment *new,
309 struct pnfs_layout_segment *old)
310{
311 u64 new_end, old_end;
312
ee26bdd6
JL		 313 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
314 return false;
0762ed2c
TM		 315 if (new->pls_range.iomode != old->pls_range.iomode)
316 return false;
317 old_end = pnfs_calc_offset_end(old->pls_range.offset,
318 old->pls_range.length);
319 if (old_end < new->pls_range.offset)
320 return false;
321 new_end = pnfs_calc_offset_end(new->pls_range.offset,
322 new->pls_range.length);
323 if (new_end < old->pls_range.offset)
324 return false;
325
326 /* Mergeable: copy info from 'old' to 'new' */
327 if (new_end < old_end)
328 new_end = old_end;
329 if (new->pls_range.offset < old->pls_range.offset)
330 new->pls_range.offset = old->pls_range.offset;
331 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
332 new_end);
333 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
334 set_bit(NFS_LSEG_ROC, &new->pls_flags);
0762ed2c
TM		 335 return true;
336}
337
338static void
339ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
340 struct pnfs_layout_segment *lseg,
341 struct list_head *free_me)
342{
343 pnfs_generic_layout_insert_lseg(lo, lseg,
344 ff_lseg_range_is_after,
345 ff_lseg_merge,
346 free_me);
347}
348
d67ae825
TH		 349static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
350{
d67ae825
TH		 351 int i, j;
352
353 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
354 for (j = i + 1; j < fls->mirror_array_cnt; j++)
355 if (fls->mirror_array[i]->efficiency <
455b6ee6
FF		 356 fls->mirror_array[j]->efficiency)
357 swap(fls->mirror_array[i],
358 fls->mirror_array[j]);
d67ae825
TH		 359 }
360}
361
362static struct pnfs_layout_segment *
363ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
364 struct nfs4_layoutget_res *lgr,
365 gfp_t gfp_flags)
366{
367 struct pnfs_layout_segment *ret;
368 struct nfs4_ff_layout_segment *fls = NULL;
369 struct xdr_stream stream;
370 struct xdr_buf buf;
371 struct page *scratch;
372 u64 stripe_unit;
373 u32 mirror_array_cnt;
374 __be32 *p;
375 int i, rc;
376
377 dprintk("--> %s\n", __func__);
378 scratch = alloc_page(gfp_flags);
379 if (!scratch)
380 return ERR_PTR(-ENOMEM);
381
382 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
383 lgr->layoutp->len);
384 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
385
386 /* stripe unit and mirror_array_cnt */
387 rc = -EIO;
388 p = xdr_inline_decode(&stream, 8 + 4);
389 if (!p)
390 goto out_err_free;
391
392 p = xdr_decode_hyper(p, &stripe_unit);
393 mirror_array_cnt = be32_to_cpup(p++);
394 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
395 stripe_unit, mirror_array_cnt);
396
397 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
398 mirror_array_cnt == 0)
399 goto out_err_free;
400
401 rc = -ENOMEM;
402 fls = kzalloc(sizeof(*fls), gfp_flags);
403 if (!fls)
404 goto out_err_free;
405
406 fls->mirror_array_cnt = mirror_array_cnt;
407 fls->stripe_unit = stripe_unit;
408 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
409 sizeof(fls->mirror_array[0]), gfp_flags);
410 if (fls->mirror_array == NULL)
411 goto out_err_free;
412
413 for (i = 0; i < fls->mirror_array_cnt; i++) {
266d12d4 414 struct nfs4_ff_layout_mirror *mirror;
97f68c6b 415 struct cred *kcred;
762bb7e9 416 const struct cred __rcu *cred;
8276c902
N		 417 kuid_t uid;
418 kgid_t gid;
90a0be00 419 u32 ds_count, fh_count, id;
d67ae825
TH		 420 int j;
421
422 rc = -EIO;
423 p = xdr_inline_decode(&stream, 4);
424 if (!p)
425 goto out_err_free;
426 ds_count = be32_to_cpup(p);
427
428 /* FIXME: allow for striping? */
429 if (ds_count != 1)
430 goto out_err_free;
431
28a0d72c 432 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
d67ae825
TH		 433 if (fls->mirror_array[i] == NULL) {
434 rc = -ENOMEM;
435 goto out_err_free;
436 }
437
d67ae825
TH		 438 fls->mirror_array[i]->ds_count = ds_count;
439
440 /* deviceid */
65990d1a 441 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
d67ae825
TH		 442 if (rc)
443 goto out_err_free;
444
d67ae825
TH		 445 /* efficiency */
446 rc = -EIO;
447 p = xdr_inline_decode(&stream, 4);
448 if (!p)
449 goto out_err_free;
450 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
451
452 /* stateid */
93b717fd 453 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
d67ae825
TH		 454 if (rc)
455 goto out_err_free;
456
457 /* fh */
662f9a10 458 rc = -EIO;
d67ae825
TH		 459 p = xdr_inline_decode(&stream, 4);
460 if (!p)
461 goto out_err_free;
462 fh_count = be32_to_cpup(p);
463
464 fls->mirror_array[i]->fh_versions =
6396bb22 465 kcalloc(fh_count, sizeof(struct nfs_fh),
d67ae825
TH		 466 gfp_flags);
467 if (fls->mirror_array[i]->fh_versions == NULL) {
468 rc = -ENOMEM;
469 goto out_err_free;
470 }
471
472 for (j = 0; j < fh_count; j++) {
473 rc = decode_nfs_fh(&stream,
474 &fls->mirror_array[i]->fh_versions[j]);
475 if (rc)
476 goto out_err_free;
477 }
478
479 fls->mirror_array[i]->fh_versions_cnt = fh_count;
480
481 /* user */
90a0be00 482 rc = decode_name(&stream, &id);
d67ae825
TH		 483 if (rc)
484 goto out_err_free;
485
8276c902 486 uid = make_kuid(&init_user_ns, id);
90a0be00 487
d67ae825 488 /* group */
90a0be00 489 rc = decode_name(&stream, &id);
d67ae825
TH		 490 if (rc)
491 goto out_err_free;
492
8276c902 493 gid = make_kgid(&init_user_ns, id);
90a0be00 494
97f68c6b
N		 495 if (gfp_flags & __GFP_FS)
496 kcred = prepare_kernel_cred(NULL);
497 else {
498 unsigned int nofs_flags = memalloc_nofs_save();
499 kcred = prepare_kernel_cred(NULL);
500 memalloc_nofs_restore(nofs_flags);
501 }
502 rc = -ENOMEM;
503 if (!kcred)
504 goto out_err_free;
8276c902
N		 505 kcred->fsuid = uid;
506 kcred->fsgid = gid;
762bb7e9 507 cred = RCU_INITIALIZER(kcred);
90a0be00 508
3064b686
JL		 509 if (lgr->range.iomode == IOMODE_READ)
510 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
511 else
512 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
90a0be00 513
266d12d4
TM		 514 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
515 if (mirror != fls->mirror_array[i]) {
90a0be00 516 /* swap cred ptrs so free_mirror will clean up old */
3064b686
JL		 517 if (lgr->range.iomode == IOMODE_READ) {
518 cred = xchg(&mirror->ro_cred, cred);
519 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
520 } else {
521 cred = xchg(&mirror->rw_cred, cred);
522 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
523 }
266d12d4
TM		 524 ff_layout_free_mirror(fls->mirror_array[i]);
525 fls->mirror_array[i] = mirror;
526 }
527
3064b686
JL		 528 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
529 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
8276c902
N		 530 from_kuid(&init_user_ns, uid),
531 from_kgid(&init_user_ns, gid));
d67ae825
TH		 532 }
533
c0f5f505 534 p = xdr_inline_decode(&stream, 4);
d0379a5d
TM		 535 if (!p)
536 goto out_sort_mirrors;
537 fls->flags = be32_to_cpup(p);
538
539 p = xdr_inline_decode(&stream, 4);
540 if (!p)
541 goto out_sort_mirrors;
542 for (i=0; i < fls->mirror_array_cnt; i++)
543 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
c0f5f505 544
d0379a5d 545out_sort_mirrors:
d67ae825
TH		 546 ff_layout_sort_mirrors(fls);
547 rc = ff_layout_check_layout(lgr);
548 if (rc)
549 goto out_err_free;
d67ae825
TH		 550 ret = &fls->generic_hdr;
551 dprintk("<-- %s (success)\n", __func__);
552out_free_page:
553 __free_page(scratch);
554 return ret;
555out_err_free:
556 _ff_layout_free_lseg(fls);
557 ret = ERR_PTR(rc);
558 dprintk("<-- %s (%d)\n", __func__, rc);
559 goto out_free_page;
560}
561
562static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
563{
564 struct pnfs_layout_segment *lseg;
565
566 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
567 if (lseg->pls_range.iomode == IOMODE_RW)
568 return true;
569
570 return false;
571}
572
573static void
574ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
575{
576 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 577
578 dprintk("--> %s\n", __func__);
579
d67ae825
TH		 580 if (lseg->pls_range.iomode == IOMODE_RW) {
581 struct nfs4_flexfile_layout *ffl;
582 struct inode *inode;
583
584 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
585 inode = ffl->generic_hdr.plh_inode;
586 spin_lock(&inode->i_lock);
587 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
588 ffl->commit_info.nbuckets = 0;
589 kfree(ffl->commit_info.buckets);
590 ffl->commit_info.buckets = NULL;
591 }
592 spin_unlock(&inode->i_lock);
593 }
594 _ff_layout_free_lseg(fls);
595}
596
597/* Return 1 until we have multiple lsegs support */
598static int
599ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
600{
601 return 1;
602}
603
abcb7bfc 604static void
e76d28dd 605nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 606{
9bbd9bb4
PT		 607 /* first IO request? */
608 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 609 timer->start_time = now;
abcb7bfc
TM		 610 }
611}
612
613static ktime_t
e76d28dd 614nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 615{
e76d28dd 616 ktime_t start;
abcb7bfc 617
9bbd9bb4
PT		 618 if (atomic_dec_return(&timer->n_ops) < 0)
619 WARN_ON_ONCE(1);
620
9bbd9bb4
PT		 621 start = timer->start_time;
622 timer->start_time = now;
abcb7bfc
TM		 623 return ktime_sub(now, start);
624}
625
97ba375b 626static bool
d983803d 627nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 628 struct nfs4_ff_layoutstat *layoutstat,
629 ktime_t now)
abcb7bfc 630{
bbf58bf3 631 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
1c8d477a 632 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
d983803d 633
e76d28dd 634 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
1f3a8e49 635 if (!mirror->start_time)
9bbd9bb4 636 mirror->start_time = now;
d0379a5d
TM		 637 if (mirror->report_interval != 0)
638 report_interval = (s64)mirror->report_interval * 1000LL;
639 else if (layoutstats_timer != 0)
bbf58bf3 640 report_interval = (s64)layoutstats_timer * 1000LL;
1c8d477a 641 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
bbf58bf3 642 report_interval) {
1c8d477a 643 ffl->last_report_time = now;
97ba375b
PT		 644 return true;
645 }
646
647 return false;
abcb7bfc
TM		 648}
649
650static void
651nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
652 __u64 requested)
653{
654 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
655
656 iostat->ops_requested++;
657 iostat->bytes_requested += requested;
658}
659
660static void
661nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
662 __u64 requested,
663 __u64 completed,
e76d28dd
TM		 664 ktime_t time_completed,
665 ktime_t time_started)
abcb7bfc
TM		 666{
667 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 668 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 669 ktime_t timer;
670
671 iostat->ops_completed++;
672 iostat->bytes_completed += completed;
673 iostat->bytes_not_delivered += requested - completed;
674
e76d28dd 675 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 676 iostat->total_busy_time =
677 ktime_add(iostat->total_busy_time, timer);
678 iostat->aggregate_completion_time =
e76d28dd
TM		 679 ktime_add(iostat->aggregate_completion_time,
680 completion_time);
abcb7bfc
TM		 681}
682
683static void
0b7baf94
TM		 684nfs4_ff_layout_stat_io_start_read(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->read_stat, now);
abcb7bfc 692 nfs4_ff_layout_stat_io_update_requested(&mirror->read_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_KERNEL);
abcb7bfc
TM		 698}
699
700static void
701nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
702 struct nfs4_ff_layout_mirror *mirror,
703 __u64 requested,
704 __u64 completed)
705{
706 spin_lock(&mirror->lock);
707 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
708 requested, completed,
e76d28dd 709 ktime_get(), task->tk_start);
06946c6a 710 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 711 spin_unlock(&mirror->lock);
712}
713
714static void
0b7baf94
TM		 715nfs4_ff_layout_stat_io_start_write(struct inode *inode,
716 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 717 __u64 requested, ktime_t now)
abcb7bfc 718{
97ba375b
PT		 719 bool report;
720
abcb7bfc 721 spin_lock(&mirror->lock);
e76d28dd 722 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc 723 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
06946c6a 724 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 725 spin_unlock(&mirror->lock);
97ba375b
PT		 726
727 if (report)
0b7baf94 728 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 729}
730
731static void
732nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
733 struct nfs4_ff_layout_mirror *mirror,
734 __u64 requested,
735 __u64 completed,
736 enum nfs3_stable_how committed)
737{
738 if (committed == NFS_UNSTABLE)
739 requested = completed = 0;
740
741 spin_lock(&mirror->lock);
742 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 743 requested, completed, ktime_get(), task->tk_start);
06946c6a 744 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 745 spin_unlock(&mirror->lock);
746}
747
d67ae825
TH		 748static int
749ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
750 struct nfs_commit_info *cinfo,
751 gfp_t gfp_flags)
752{
753 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
754 struct pnfs_commit_bucket *buckets;
755 int size;
756
757 if (cinfo->ds->nbuckets != 0) {
758 /* This assumes there is only one RW lseg per file.
759 * To support multiple lseg per file, we need to
760 * change struct pnfs_commit_bucket to allow dynamic
761 * increasing nbuckets.
762 */
763 return 0;
764 }
765
766 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
767
768 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
769 gfp_flags);
770 if (!buckets)
771 return -ENOMEM;
772 else {
773 int i;
774
fe238e60 775 spin_lock(&cinfo->inode->i_lock);
d67ae825
TH		 776 if (cinfo->ds->nbuckets != 0)
777 kfree(buckets);
778 else {
779 cinfo->ds->buckets = buckets;
780 cinfo->ds->nbuckets = size;
781 for (i = 0; i < size; i++) {
782 INIT_LIST_HEAD(&buckets[i].written);
783 INIT_LIST_HEAD(&buckets[i].committing);
784 /* mark direct verifier as unset */
785 buckets[i].direct_verf.committed =
786 NFS_INVALID_STABLE_HOW;
787 }
788 }
fe238e60 789 spin_unlock(&cinfo->inode->i_lock);
d67ae825
TH		 790 return 0;
791 }
792}
793
76c66905
TM		 794static void
795ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx)
796{
797 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
798
799 if (devid)
800 nfs4_mark_deviceid_unavailable(devid);
801}
802
803static void
804ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx)
805{
806 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
807
808 if (devid)
809 nfs4_mark_deviceid_available(devid);
810}
811
d67ae825 812static struct nfs4_pnfs_ds *
76c66905
TM		 813ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
814 int start_idx, int *best_idx,
815 bool check_device)
d67ae825 816{
13544412 817 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
2444ff27 818 struct nfs4_ff_layout_mirror *mirror;
d67ae825 819 struct nfs4_pnfs_ds *ds;
3dc14735 820 bool fail_return = false;
d67ae825
TH		 821 int idx;
822
76c66905 823 /* mirrors are initially sorted by efficiency */
13544412 824 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
3dc14735 825 if (idx+1 == fls->mirror_array_cnt)
76c66905 826 fail_return = !check_device;
2444ff27
TM		 827
828 mirror = FF_LAYOUT_COMP(lseg, idx);
76c66905
TM		 829 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return);
830 if (!ds)
2444ff27
TM		 831 continue;
832
76c66905
TM		 833 if (check_device &&
834 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
835 continue;
836
837 *best_idx = idx;
838 return ds;
d67ae825
TH		 839 }
840
841 return NULL;
842}
843
76c66905
TM		 844static struct nfs4_pnfs_ds *
845ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
846 int start_idx, int *best_idx)
847{
848 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
849}
850
851static struct nfs4_pnfs_ds *
852ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
853 int start_idx, int *best_idx)
854{
855 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
856}
857
858static struct nfs4_pnfs_ds *
859ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
860 int start_idx, int *best_idx)
861{
862 struct nfs4_pnfs_ds *ds;
863
864 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
865 if (ds)
866 return ds;
867 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
868}
869
c7d73af2
TH		 870static void
871ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
872 struct nfs_page *req,
873 bool strict_iomode)
874{
c7d73af2
TH		 875 pnfs_put_lseg(pgio->pg_lseg);
876 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 877 nfs_req_openctx(req),
c7d73af2
TH		 878 0,
879 NFS4_MAX_UINT64,
880 IOMODE_READ,
881 strict_iomode,
882 GFP_KERNEL);
883 if (IS_ERR(pgio->pg_lseg)) {
884 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
885 pgio->pg_lseg = NULL;
886 }
c7d73af2
TH		 887}
888
d67ae825
TH		 889static void
890ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
891 struct nfs_page *req)
892{
893 struct nfs_pgio_mirror *pgm;
894 struct nfs4_ff_layout_mirror *mirror;
895 struct nfs4_pnfs_ds *ds;
896 int ds_idx;
897
3dc14735 898retry:
b3230e80 899 pnfs_generic_pg_check_layout(pgio);
d67ae825 900 /* Use full layout for now */
1c1aeaf1 901 if (!pgio->pg_lseg) {
c7d73af2 902 ff_layout_pg_get_read(pgio, req, false);
1c1aeaf1
TM		 903 if (!pgio->pg_lseg)
904 goto out_nolseg;
905 }
906 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
c7d73af2 907 ff_layout_pg_get_read(pgio, req, true);
1c1aeaf1
TM		 908 if (!pgio->pg_lseg)
909 goto out_nolseg;
910 }
d67ae825 911
13544412 912 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
446ca219 913 if (!ds) {
3dc14735 914 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 915 goto out_mds;
3dc14735
TM		 916 pnfs_put_lseg(pgio->pg_lseg);
917 pgio->pg_lseg = NULL;
918 /* Sleep for 1 second before retrying */
919 ssleep(1);
920 goto retry;
446ca219
TH		 921 }
922
d67ae825
TH		 923 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
924
925 pgio->pg_mirror_idx = ds_idx;
926
927 /* read always uses only one mirror - idx 0 for pgio layer */
928 pgm = &pgio->pg_mirrors[0];
929 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
930
33344e0f 931 pgio->pg_maxretrans = io_maxretrans;
d67ae825 932 return;
1c1aeaf1
TM		 933out_nolseg:
934 if (pgio->pg_error < 0)
935 return;
d67ae825
TH		 936out_mds:
937 pnfs_put_lseg(pgio->pg_lseg);
938 pgio->pg_lseg = NULL;
939 nfs_pageio_reset_read_mds(pgio);
940}
941
942static void
943ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
944 struct nfs_page *req)
945{
946 struct nfs4_ff_layout_mirror *mirror;
947 struct nfs_pgio_mirror *pgm;
948 struct nfs_commit_info cinfo;
949 struct nfs4_pnfs_ds *ds;
950 int i;
951 int status;
952
3dc14735 953retry:
b3230e80 954 pnfs_generic_pg_check_layout(pgio);
d600ad1f 955 if (!pgio->pg_lseg) {
d67ae825 956 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 957 nfs_req_openctx(req),
d67ae825
TH		 958 0,
959 NFS4_MAX_UINT64,
960 IOMODE_RW,
c7d73af2 961 false,
d67ae825 962 GFP_NOFS);
d600ad1f
PT		 963 if (IS_ERR(pgio->pg_lseg)) {
964 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
965 pgio->pg_lseg = NULL;
966 return;
967 }
968 }
d67ae825
TH		 969 /* If no lseg, fall back to write through mds */
970 if (pgio->pg_lseg == NULL)
971 goto out_mds;
972
973 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
974 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
975 if (status < 0)
976 goto out_mds;
977
978 /* Use a direct mapping of ds_idx to pgio mirror_idx */
979 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
980 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
981 goto out_mds;
982
983 for (i = 0; i < pgio->pg_mirror_count; i++) {
2444ff27 984 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
2444ff27 985 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
446ca219 986 if (!ds) {
3dc14735 987 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 988 goto out_mds;
3dc14735
TM		 989 pnfs_put_lseg(pgio->pg_lseg);
990 pgio->pg_lseg = NULL;
991 /* Sleep for 1 second before retrying */
992 ssleep(1);
993 goto retry;
446ca219 994 }
d67ae825 995 pgm = &pgio->pg_mirrors[i];
d67ae825
TH		 996 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
997 }
998
33344e0f 999 pgio->pg_maxretrans = io_maxretrans;
d67ae825
TH		 1000 return;
1001
1002out_mds:
1003 pnfs_put_lseg(pgio->pg_lseg);
1004 pgio->pg_lseg = NULL;
1005 nfs_pageio_reset_write_mds(pgio);
1006}
1007
1008static unsigned int
1009ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
1010 struct nfs_page *req)
1011{
d600ad1f 1012 if (!pgio->pg_lseg) {
d67ae825 1013 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
9fcd5960 1014 nfs_req_openctx(req),
d67ae825
TH		 1015 0,
1016 NFS4_MAX_UINT64,
1017 IOMODE_RW,
c7d73af2 1018 false,
d67ae825 1019 GFP_NOFS);
d600ad1f
PT		 1020 if (IS_ERR(pgio->pg_lseg)) {
1021 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1022 pgio->pg_lseg = NULL;
1023 goto out;
1024 }
1025 }
d67ae825
TH		 1026 if (pgio->pg_lseg)
1027 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
1028
1029 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 1030 nfs_pageio_reset_write_mds(pgio);
d600ad1f 1031out:
d67ae825
TH		 1032 return 1;
1033}
1034
1035static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1036 .pg_init = ff_layout_pg_init_read,
1037 .pg_test = pnfs_generic_pg_test,
1038 .pg_doio = pnfs_generic_pg_readpages,
1039 .pg_cleanup = pnfs_generic_pg_cleanup,
1040};
1041
1042static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1043 .pg_init = ff_layout_pg_init_write,
1044 .pg_test = pnfs_generic_pg_test,
1045 .pg_doio = pnfs_generic_pg_writepages,
1046 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1047 .pg_cleanup = pnfs_generic_pg_cleanup,
1048};
1049
1050static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1051{
1052 struct rpc_task *task = &hdr->task;
1053
1054 pnfs_layoutcommit_inode(hdr->inode, false);
1055
1056 if (retry_pnfs) {
1057 dprintk("%s Reset task %5u for i/o through pNFS "
1058 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1059 hdr->task.tk_pid,
1060 hdr->inode->i_sb->s_id,
1061 (unsigned long long)NFS_FILEID(hdr->inode),
1062 hdr->args.count,
1063 (unsigned long long)hdr->args.offset);
1064
dc602dd7 1065 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1066 return;
1067 }
1068
1069 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1070 dprintk("%s Reset task %5u for i/o through MDS "
1071 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1072 hdr->task.tk_pid,
1073 hdr->inode->i_sb->s_id,
1074 (unsigned long long)NFS_FILEID(hdr->inode),
1075 hdr->args.count,
1076 (unsigned long long)hdr->args.offset);
1077
1078 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1079 }
1080}
1081
1082static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1083{
1084 struct rpc_task *task = &hdr->task;
1085
1086 pnfs_layoutcommit_inode(hdr->inode, false);
1087
1088 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1089 dprintk("%s Reset task %5u for i/o through MDS "
1090 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1091 hdr->task.tk_pid,
1092 hdr->inode->i_sb->s_id,
1093 (unsigned long long)NFS_FILEID(hdr->inode),
1094 hdr->args.count,
1095 (unsigned long long)hdr->args.offset);
1096
1097 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1098 }
1099}
1100
1101static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1102 struct nfs4_state *state,
1103 struct nfs_client *clp,
1104 struct pnfs_layout_segment *lseg,
1105 int idx)
1106{
1107 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1108 struct inode *inode = lo->plh_inode;
d67ae825 1109 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
d67ae825
TH		 1110 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1111
d67ae825 1112 switch (task->tk_status) {
d67ae825
TH		 1113 case -NFS4ERR_BADSESSION:
1114 case -NFS4ERR_BADSLOT:
1115 case -NFS4ERR_BAD_HIGH_SLOT:
1116 case -NFS4ERR_DEADSESSION:
1117 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1118 case -NFS4ERR_SEQ_FALSE_RETRY:
1119 case -NFS4ERR_SEQ_MISORDERED:
1120 dprintk("%s ERROR %d, Reset session. Exchangeid "
1121 "flags 0x%x\n", __func__, task->tk_status,
1122 clp->cl_exchange_flags);
1123 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1124 break;
1125 case -NFS4ERR_DELAY:
1126 case -NFS4ERR_GRACE:
1127 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1128 break;
1129 case -NFS4ERR_RETRY_UNCACHED_REP:
1130 break;
a79f194a
TM		 1131 case -EAGAIN:
1132 return -NFS4ERR_RESET_TO_PNFS;
d67ae825
TH		 1133 /* Invalidate Layout errors */
1134 case -NFS4ERR_PNFS_NO_LAYOUT:
1135 case -ESTALE: /* mapped NFS4ERR_STALE */
1136 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1137 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1138 case -NFS4ERR_FHEXPIRED:
1139 case -NFS4ERR_WRONG_TYPE:
1140 dprintk("%s Invalid layout error %d\n", __func__,
1141 task->tk_status);
1142 /*
1143 * Destroy layout so new i/o will get a new layout.
1144 * Layout will not be destroyed until all current lseg
1145 * references are put. Mark layout as invalid to resend failed
1146 * i/o and all i/o waiting on the slot table to the MDS until
1147 * layout is destroyed and a new valid layout is obtained.
1148 */
1149 pnfs_destroy_layout(NFS_I(inode));
1150 rpc_wake_up(&tbl->slot_tbl_waitq);
1151 goto reset;
1152 /* RPC connection errors */
1153 case -ECONNREFUSED:
1154 case -EHOSTDOWN:
1155 case -EHOSTUNREACH:
1156 case -ENETUNREACH:
1157 case -EIO:
1158 case -ETIMEDOUT:
1159 case -EPIPE:
1160 dprintk("%s DS connection error %d\n", __func__,
1161 task->tk_status);
1c48cee8
WAA		 1162 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1163 &devid->deviceid);
d67ae825
TH		 1164 rpc_wake_up(&tbl->slot_tbl_waitq);
1165 /* fall through */
1166 default:
3b13b4b3 1167 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1168 return -NFS4ERR_RESET_TO_PNFS;
1169reset:
1170 dprintk("%s Retry through MDS. Error %d\n", __func__,
1171 task->tk_status);
1172 return -NFS4ERR_RESET_TO_MDS;
1173 }
d67ae825
TH		 1174 task->tk_status = 0;
1175 return -EAGAIN;
d67ae825
TH		 1176}
1177
1178/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1179static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1180 struct pnfs_layout_segment *lseg,
1181 int idx)
1182{
1183 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1184
90816d1d
TM		 1185 switch (task->tk_status) {
1186 /* File access problems. Don't mark the device as unavailable */
1187 case -EACCES:
1188 case -ESTALE:
1189 case -EISDIR:
1190 case -EBADHANDLE:
1191 case -ELOOP:
1192 case -ENOSPC:
a79f194a 1193 case -EAGAIN:
90816d1d
TM		 1194 break;
1195 case -EJUKEBOX:
1196 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1197 goto out_retry;
1198 default:
d67ae825
TH		 1199 dprintk("%s DS connection error %d\n", __func__,
1200 task->tk_status);
1c48cee8
WAA		 1201 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1202 &devid->deviceid);
d67ae825 1203 }
90816d1d
TM		 1204 /* FIXME: Need to prevent infinite looping here. */
1205 return -NFS4ERR_RESET_TO_PNFS;
1206out_retry:
d67ae825 1207 task->tk_status = 0;
7eeea167 1208 rpc_restart_call_prepare(task);
d67ae825
TH		 1209 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1210 return -EAGAIN;
1211}
1212
1213static int ff_layout_async_handle_error(struct rpc_task *task,
1214 struct nfs4_state *state,
1215 struct nfs_client *clp,
1216 struct pnfs_layout_segment *lseg,
1217 int idx)
1218{
1219 int vers = clp->cl_nfs_mod->rpc_vers->number;
1220
76c66905
TM		 1221 if (task->tk_status >= 0) {
1222 ff_layout_mark_ds_reachable(lseg, idx);
df3ab232 1223 return 0;
76c66905 1224 }
df3ab232
TM		 1225
1226 /* Handle the case of an invalid layout segment */
1227 if (!pnfs_is_valid_lseg(lseg))
1228 return -NFS4ERR_RESET_TO_PNFS;
1229
d67ae825
TH		 1230 switch (vers) {
1231 case 3:
1232 return ff_layout_async_handle_error_v3(task, lseg, idx);
1233 case 4:
1234 return ff_layout_async_handle_error_v4(task, state, clp,
1235 lseg, idx);
1236 default:
1237 /* should never happen */
1238 WARN_ON_ONCE(1);
1239 return 0;
1240 }
1241}
1242
1243static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1244 int idx, u64 offset, u64 length,
dd52128a 1245 u32 status, int opnum, int error)
d67ae825
TH		 1246{
1247 struct nfs4_ff_layout_mirror *mirror;
1248 int err;
1249
dd52128a
TM		 1250 if (status == 0) {
1251 switch (error) {
1252 case -ETIMEDOUT:
1253 case -EPFNOSUPPORT:
1254 case -EPROTONOSUPPORT:
1255 case -EOPNOTSUPP:
1256 case -ECONNREFUSED:
1257 case -ECONNRESET:
1258 case -EHOSTDOWN:
1259 case -EHOSTUNREACH:
1260 case -ENETUNREACH:
1261 case -EADDRINUSE:
1262 case -ENOBUFS:
1263 case -EPIPE:
1264 case -EPERM:
1265 status = NFS4ERR_NXIO;
1266 break;
1267 case -EACCES:
1268 status = NFS4ERR_ACCESS;
1269 break;
1270 default:
1271 return;
1272 }
1273 }
1274
c22eeb86
PT		 1275 switch (status) {
1276 case NFS4ERR_DELAY:
1277 case NFS4ERR_GRACE:
1278 return;
1279 default:
1280 break;
1281 }
1282
d67ae825
TH		 1283 mirror = FF_LAYOUT_COMP(lseg, idx);
1284 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1285 mirror, offset, length, status, opnum,
1286 GFP_NOIO);
76c66905
TM		 1287 if (status == NFS4ERR_NXIO)
1288 ff_layout_mark_ds_unreachable(lseg, idx);
f95c03b2 1289 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
d67ae825
TH		 1290 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1291}
1292
1293/* NFS_PROTO call done callback routines */
d67ae825
TH		 1294static int ff_layout_read_done_cb(struct rpc_task *task,
1295 struct nfs_pgio_header *hdr)
1296{
166bd5b8 1297 int new_idx = hdr->pgio_mirror_idx;
d67ae825
TH		 1298 int err;
1299
1300 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1301 if (task->tk_status < 0)
d67ae825
TH		 1302 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1303 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1304 hdr->res.op_status, OP_READ,
1305 task->tk_status);
d67ae825
TH		 1306 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1307 hdr->ds_clp, hdr->lseg,
1308 hdr->pgio_mirror_idx);
1309
42f86b44
TM		 1310 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1311 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1312 switch (err) {
1313 case -NFS4ERR_RESET_TO_PNFS:
13544412
TM		 1314 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1315 hdr->pgio_mirror_idx + 1,
166bd5b8 1316 &new_idx))
f0922a6c 1317 goto out_layouterror;
42f86b44 1318 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
d67ae825
TH		 1319 return task->tk_status;
1320 case -NFS4ERR_RESET_TO_MDS:
42f86b44 1321 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1322 return task->tk_status;
1323 case -EAGAIN:
13544412 1324 goto out_eagain;
d67ae825
TH		 1325 }
1326
1327 return 0;
f0922a6c 1328out_layouterror:
166bd5b8 1329 ff_layout_read_record_layoutstats_done(task, hdr);
f0922a6c 1330 ff_layout_send_layouterror(hdr->lseg);
166bd5b8 1331 hdr->pgio_mirror_idx = new_idx;
13544412
TM		 1332out_eagain:
1333 rpc_restart_call_prepare(task);
1334 return -EAGAIN;
d67ae825
TH		 1335}
1336
c0f5f505
TM		 1337static bool
1338ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1339{
1340 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1341}
1342
d67ae825
TH		 1343/*
1344 * We reference the rpc_cred of the first WRITE that triggers the need for
1345 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1346 * rfc5661 is not clear about which credential should be used.
1347 *
1348 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1349 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1350 * we always send layoutcommit after DS writes.
1351 */
1352static void
bc28e1c2
TM		 1353ff_layout_set_layoutcommit(struct inode *inode,
1354 struct pnfs_layout_segment *lseg,
1355 loff_t end_offset)
d67ae825 1356{
bc28e1c2 1357 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1358 return;
1359
bc28e1c2
TM		 1360 pnfs_set_layoutcommit(inode, lseg, end_offset);
1361 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1362 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1363}
1364
37e9ed22
TM		 1365static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1366 struct nfs_pgio_header *hdr)
d67ae825 1367{
37e9ed22
TM		 1368 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1369 return;
0b7baf94 1370 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1371 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1372 hdr->args.count,
1373 task->tk_start);
37e9ed22
TM		 1374}
1375
1376static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1377 struct nfs_pgio_header *hdr)
1378{
1379 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1380 return;
1381 nfs4_ff_layout_stat_io_end_read(task,
1382 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1383 hdr->args.count,
1384 hdr->res.count);
056f9ad6 1385 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1386}
abcb7bfc 1387
37e9ed22
TM		 1388static int ff_layout_read_prepare_common(struct rpc_task *task,
1389 struct nfs_pgio_header *hdr)
1390{
d67ae825
TH		 1391 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1392 rpc_exit(task, -EIO);
1393 return -EIO;
1394 }
d67ae825 1395
37e9ed22 1396 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1397 return 0;
1398}
1399
1400/*
1401 * Call ops for the async read/write cases
1402 * In the case of dense layouts, the offset needs to be reset to its
1403 * original value.
1404 */
1405static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1406{
1407 struct nfs_pgio_header *hdr = data;
1408
1409 if (ff_layout_read_prepare_common(task, hdr))
1410 return;
1411
1412 rpc_call_start(task);
1413}
1414
d67ae825
TH		 1415static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1416{
1417 struct nfs_pgio_header *hdr = data;
1418
6de7e12f
AS		 1419 if (nfs4_setup_sequence(hdr->ds_clp,
1420 &hdr->args.seq_args,
1421 &hdr->res.seq_res,
1422 task))
d67ae825
TH		 1423 return;
1424
bb21ce0a 1425 ff_layout_read_prepare_common(task, hdr);
d67ae825
TH		 1426}
1427
a79f194a
TM		 1428static void
1429ff_layout_io_prepare_transmit(struct rpc_task *task,
1430 void *data)
1431{
1432 struct nfs_pgio_header *hdr = data;
1433
1434 if (!pnfs_is_valid_lseg(hdr->lseg))
1435 rpc_exit(task, -EAGAIN);
1436}
1437
d67ae825
TH		 1438static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1439{
1440 struct nfs_pgio_header *hdr = data;
1441
1442 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1443
1444 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1445 task->tk_status == 0) {
1446 nfs4_sequence_done(task, &hdr->res.seq_res);
1447 return;
1448 }
1449
1450 /* Note this may cause RPC to be resent */
1451 hdr->mds_ops->rpc_call_done(task, hdr);
1452}
1453
1454static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1455{
1456 struct nfs_pgio_header *hdr = data;
1457
37e9ed22 1458 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1459 rpc_count_iostats_metrics(task,
1460 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1461}
1462
4d0ac221
TM		 1463static void ff_layout_read_release(void *data)
1464{
1465 struct nfs_pgio_header *hdr = data;
1466
1467 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
f0922a6c
TM		 1468 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1469 ff_layout_send_layouterror(hdr->lseg);
42f86b44 1470 pnfs_read_resend_pnfs(hdr);
f0922a6c 1471 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
42f86b44 1472 ff_layout_reset_read(hdr);
4d0ac221
TM		 1473 pnfs_generic_rw_release(data);
1474}
1475
1476
d67ae825
TH		 1477static int ff_layout_write_done_cb(struct rpc_task *task,
1478 struct nfs_pgio_header *hdr)
1479{
2e18d4d8 1480 loff_t end_offs = 0;
d67ae825
TH		 1481 int err;
1482
1483 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1484 if (task->tk_status < 0)
d67ae825
TH		 1485 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1486 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1487 hdr->res.op_status, OP_WRITE,
1488 task->tk_status);
d67ae825
TH		 1489 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1490 hdr->ds_clp, hdr->lseg,
1491 hdr->pgio_mirror_idx);
1492
7b0df92a
TM		 1493 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1494 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1495 switch (err) {
1496 case -NFS4ERR_RESET_TO_PNFS:
7b0df92a 1497 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
7cc8c5cd 1498 return task->tk_status;
d67ae825 1499 case -NFS4ERR_RESET_TO_MDS:
7b0df92a 1500 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1501 return task->tk_status;
1502 case -EAGAIN:
d67ae825
TH		 1503 return -EAGAIN;
1504 }
1505
1506 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1507 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1508 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1509
1510 /* Note: if the write is unstable, don't set end_offs until commit */
1511 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1512
54204010
PT		 1513 /* zero out fattr since we don't care DS attr at all */
1514 hdr->fattr.valid = 0;
69f230d9
PT		 1515 if (task->tk_status >= 0)
1516 nfs_writeback_update_inode(hdr);
1517
d67ae825
TH		 1518 return 0;
1519}
1520
1521static int ff_layout_commit_done_cb(struct rpc_task *task,
1522 struct nfs_commit_data *data)
1523{
d67ae825
TH		 1524 int err;
1525
1526 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
dd52128a 1527 if (task->tk_status < 0)
d67ae825
TH		 1528 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1529 data->args.offset, data->args.count,
dd52128a
TM		 1530 data->res.op_status, OP_COMMIT,
1531 task->tk_status);
d67ae825
TH		 1532 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1533 data->lseg, data->ds_commit_index);
1534
1535 switch (err) {
1536 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1537 pnfs_generic_prepare_to_resend_writes(data);
1538 return -EAGAIN;
d67ae825 1539 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1540 pnfs_generic_prepare_to_resend_writes(data);
1541 return -EAGAIN;
1542 case -EAGAIN:
1543 rpc_restart_call_prepare(task);
1544 return -EAGAIN;
1545 }
1546
bc28e1c2 1547 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1548
1549 return 0;
1550}
1551
37e9ed22
TM		 1552static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1553 struct nfs_pgio_header *hdr)
d67ae825 1554{
37e9ed22
TM		 1555 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1556 return;
0b7baf94 1557 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1558 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1559 hdr->args.count,
1560 task->tk_start);
37e9ed22
TM		 1561}
1562
1563static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1564 struct nfs_pgio_header *hdr)
1565{
1566 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1567 return;
1568 nfs4_ff_layout_stat_io_end_write(task,
1569 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1570 hdr->args.count, hdr->res.count,
1571 hdr->res.verf->committed);
056f9ad6 1572 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1573}
abcb7bfc 1574
37e9ed22
TM		 1575static int ff_layout_write_prepare_common(struct rpc_task *task,
1576 struct nfs_pgio_header *hdr)
1577{
d67ae825
TH		 1578 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1579 rpc_exit(task, -EIO);
1580 return -EIO;
1581 }
1582
37e9ed22 1583 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1584 return 0;
1585}
1586
1587static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1588{
1589 struct nfs_pgio_header *hdr = data;
1590
1591 if (ff_layout_write_prepare_common(task, hdr))
1592 return;
1593
1594 rpc_call_start(task);
1595}
1596
1597static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1598{
1599 struct nfs_pgio_header *hdr = data;
1600
6de7e12f
AS		 1601 if (nfs4_setup_sequence(hdr->ds_clp,
1602 &hdr->args.seq_args,
1603 &hdr->res.seq_res,
1604 task))
d67ae825
TH		 1605 return;
1606
bb21ce0a 1607 ff_layout_write_prepare_common(task, hdr);
d67ae825
TH		 1608}
1609
1610static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1611{
1612 struct nfs_pgio_header *hdr = data;
1613
1614 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1615 task->tk_status == 0) {
1616 nfs4_sequence_done(task, &hdr->res.seq_res);
1617 return;
1618 }
1619
1620 /* Note this may cause RPC to be resent */
1621 hdr->mds_ops->rpc_call_done(task, hdr);
1622}
1623
1624static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1625{
1626 struct nfs_pgio_header *hdr = data;
1627
37e9ed22 1628 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1629 rpc_count_iostats_metrics(task,
1630 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1631}
1632
4d0ac221
TM		 1633static void ff_layout_write_release(void *data)
1634{
1635 struct nfs_pgio_header *hdr = data;
1636
1637 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
f0922a6c
TM		 1638 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1639 ff_layout_send_layouterror(hdr->lseg);
7b0df92a 1640 ff_layout_reset_write(hdr, true);
f0922a6c 1641 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
7b0df92a 1642 ff_layout_reset_write(hdr, false);
4d0ac221
TM		 1643 pnfs_generic_rw_release(data);
1644}
1645
37e9ed22 1646static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1647 struct nfs_commit_data *cdata)
1648{
37e9ed22
TM		 1649 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1650 return;
0b7baf94 1651 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1652 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1653 0, task->tk_start);
abcb7bfc
TM		 1654}
1655
37e9ed22
TM		 1656static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1657 struct nfs_commit_data *cdata)
1658{
1659 struct nfs_page *req;
1660 __u64 count = 0;
1661
1662 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1663 return;
1664
1665 if (task->tk_status == 0) {
1666 list_for_each_entry(req, &cdata->pages, wb_list)
1667 count += req->wb_bytes;
1668 }
1669 nfs4_ff_layout_stat_io_end_write(task,
1670 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1671 count, count, NFS_FILE_SYNC);
056f9ad6 1672 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
37e9ed22
TM		 1673}
1674
1675static void ff_layout_commit_prepare_common(struct rpc_task *task,
1676 struct nfs_commit_data *cdata)
1677{
1678 ff_layout_commit_record_layoutstats_start(task, cdata);
1679}
1680
d67ae825
TH		 1681static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1682{
abcb7bfc 1683 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1684 rpc_call_start(task);
1685}
1686
1687static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1688{
1689 struct nfs_commit_data *wdata = data;
1690
6de7e12f
AS		 1691 if (nfs4_setup_sequence(wdata->ds_clp,
1692 &wdata->args.seq_args,
1693 &wdata->res.seq_res,
1694 task))
abcb7bfc
TM		 1695 return;
1696 ff_layout_commit_prepare_common(task, data);
1697}
1698
1699static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1700{
1701 pnfs_generic_write_commit_done(task, data);
1702}
1703
1704static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1705{
1706 struct nfs_commit_data *cdata = data;
abcb7bfc 1707
37e9ed22 1708 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1709 rpc_count_iostats_metrics(task,
1710 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1711}
1712
4d0ac221
TM		 1713static void ff_layout_commit_release(void *data)
1714{
1715 struct nfs_commit_data *cdata = data;
1716
1717 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1718 pnfs_generic_commit_release(data);
1719}
1720
d67ae825
TH		 1721static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1722 .rpc_call_prepare = ff_layout_read_prepare_v3,
a79f194a 1723 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
d67ae825
TH		 1724 .rpc_call_done = ff_layout_read_call_done,
1725 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1726 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1727};
1728
1729static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1730 .rpc_call_prepare = ff_layout_read_prepare_v4,
a79f194a 1731 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
d67ae825
TH		 1732 .rpc_call_done = ff_layout_read_call_done,
1733 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1734 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1735};
1736
1737static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1738 .rpc_call_prepare = ff_layout_write_prepare_v3,
a79f194a 1739 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
d67ae825
TH		 1740 .rpc_call_done = ff_layout_write_call_done,
1741 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1742 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1743};
1744
1745static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1746 .rpc_call_prepare = ff_layout_write_prepare_v4,
a79f194a 1747 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
d67ae825
TH		 1748 .rpc_call_done = ff_layout_write_call_done,
1749 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1750 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1751};
1752
1753static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1754 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1755 .rpc_call_done = ff_layout_commit_done,
d67ae825 1756 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1757 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1758};
1759
1760static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1761 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1762 .rpc_call_done = ff_layout_commit_done,
d67ae825 1763 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1764 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1765};
1766
1767static enum pnfs_try_status
1768ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1769{
1770 struct pnfs_layout_segment *lseg = hdr->lseg;
1771 struct nfs4_pnfs_ds *ds;
1772 struct rpc_clnt *ds_clnt;
2444ff27 1773 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1774 const struct cred *ds_cred;
d67ae825
TH		 1775 loff_t offset = hdr->args.offset;
1776 u32 idx = hdr->pgio_mirror_idx;
1777 int vers;
1778 struct nfs_fh *fh;
1779
5b5e0928 1780 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
d67ae825
TH		 1781 __func__, hdr->inode->i_ino,
1782 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1783
2444ff27
TM		 1784 mirror = FF_LAYOUT_COMP(lseg, idx);
1785 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
d67ae825
TH		 1786 if (!ds)
1787 goto out_failed;
1788
561d6f8a 1789 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1790 hdr->inode);
1791 if (IS_ERR(ds_clnt))
1792 goto out_failed;
1793
312cd4cb 1794 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
57f3f4c0 1795 if (!ds_cred)
d67ae825
TH		 1796 goto out_failed;
1797
626d48b1 1798 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825
TH		 1799
1800 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
212bf41d 1801 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
d67ae825 1802
75bf47eb 1803 hdr->pgio_done_cb = ff_layout_read_done_cb;
212bf41d 1804 refcount_inc(&ds->ds_clp->cl_count);
d67ae825 1805 hdr->ds_clp = ds->ds_clp;
749da527 1806 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1807 if (fh)
1808 hdr->args.fh = fh;
bb21ce0a 1809
4cbc8a57 1810 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
bb21ce0a 1811
d67ae825
TH		 1812 /*
1813 * Note that if we ever decide to split across DSes,
1814 * then we may need to handle dense-like offsets.
1815 */
1816 hdr->args.offset = offset;
1817 hdr->mds_offset = offset;
1818
1819 /* Perform an asynchronous read to ds */
1820 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1821 vers == 3 ? &ff_layout_read_call_ops_v3 :
1822 &ff_layout_read_call_ops_v4,
1823 0, RPC_TASK_SOFTCONN);
a52458b4 1824 put_cred(ds_cred);
d67ae825
TH		 1825 return PNFS_ATTEMPTED;
1826
1827out_failed:
3b13b4b3 1828 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1829 return PNFS_TRY_AGAIN;
1830 return PNFS_NOT_ATTEMPTED;
1831}
1832
1833/* Perform async writes. */
1834static enum pnfs_try_status
1835ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1836{
1837 struct pnfs_layout_segment *lseg = hdr->lseg;
1838 struct nfs4_pnfs_ds *ds;
1839 struct rpc_clnt *ds_clnt;
2444ff27 1840 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1841 const struct cred *ds_cred;
d67ae825
TH		 1842 loff_t offset = hdr->args.offset;
1843 int vers;
1844 struct nfs_fh *fh;
1845 int idx = hdr->pgio_mirror_idx;
1846
2444ff27
TM		 1847 mirror = FF_LAYOUT_COMP(lseg, idx);
1848 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825 1849 if (!ds)
37f8aa16 1850 goto out_failed;
d67ae825 1851
561d6f8a 1852 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1853 hdr->inode);
1854 if (IS_ERR(ds_clnt))
37f8aa16 1855 goto out_failed;
d67ae825 1856
312cd4cb 1857 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
57f3f4c0 1858 if (!ds_cred)
37f8aa16 1859 goto out_failed;
d67ae825 1860
626d48b1 1861 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825 1862
5b5e0928 1863 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
d67ae825 1864 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
212bf41d 1865 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1866 vers);
1867
1868 hdr->pgio_done_cb = ff_layout_write_done_cb;
212bf41d 1869 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1870 hdr->ds_clp = ds->ds_clp;
1871 hdr->ds_commit_idx = idx;
749da527 1872 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1873 if (fh)
1874 hdr->args.fh = fh;
1875
4cbc8a57 1876 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
bb21ce0a 1877
d67ae825
TH		 1878 /*
1879 * Note that if we ever decide to split across DSes,
1880 * then we may need to handle dense-like offsets.
1881 */
1882 hdr->args.offset = offset;
1883
1884 /* Perform an asynchronous write */
1885 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1886 vers == 3 ? &ff_layout_write_call_ops_v3 :
1887 &ff_layout_write_call_ops_v4,
1888 sync, RPC_TASK_SOFTCONN);
a52458b4 1889 put_cred(ds_cred);
d67ae825 1890 return PNFS_ATTEMPTED;
37f8aa16
TM		 1891
1892out_failed:
1893 if (ff_layout_avoid_mds_available_ds(lseg))
1894 return PNFS_TRY_AGAIN;
1895 return PNFS_NOT_ATTEMPTED;
d67ae825
TH		 1896}
1897
d67ae825
TH		 1898static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1899{
1900 return i;
1901}
1902
1903static struct nfs_fh *
1904select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1905{
1906 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1907
1908 /* FIXME: Assume that there is only one NFS version available
1909 * for the DS.
1910 */
1911 return &flseg->mirror_array[i]->fh_versions[0];
1912}
1913
1914static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1915{
1916 struct pnfs_layout_segment *lseg = data->lseg;
1917 struct nfs4_pnfs_ds *ds;
1918 struct rpc_clnt *ds_clnt;
2444ff27 1919 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1920 const struct cred *ds_cred;
d67ae825 1921 u32 idx;
57f3f4c0 1922 int vers, ret;
d67ae825
TH		 1923 struct nfs_fh *fh;
1924
4b75053e
TM		 1925 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1926 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1927 goto out_err;
1928
d67ae825 1929 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
2444ff27
TM		 1930 mirror = FF_LAYOUT_COMP(lseg, idx);
1931 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825
TH		 1932 if (!ds)
1933 goto out_err;
1934
561d6f8a 1935 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
d67ae825
TH		 1936 data->inode);
1937 if (IS_ERR(ds_clnt))
1938 goto out_err;
1939
312cd4cb 1940 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
57f3f4c0 1941 if (!ds_cred)
d67ae825
TH		 1942 goto out_err;
1943
626d48b1 1944 vers = nfs4_ff_layout_ds_version(mirror);
d67ae825
TH		 1945
1946 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
212bf41d 1947 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1948 vers);
1949 data->commit_done_cb = ff_layout_commit_done_cb;
1950 data->cred = ds_cred;
212bf41d 1951 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1952 data->ds_clp = ds->ds_clp;
1953 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1954 if (fh)
1955 data->args.fh = fh;
abcb7bfc 1956
57f3f4c0 1957 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1958 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1959 &ff_layout_commit_call_ops_v4,
1960 how, RPC_TASK_SOFTCONN);
a52458b4 1961 put_cred(ds_cred);
57f3f4c0 1962 return ret;
d67ae825
TH		 1963out_err:
1964 pnfs_generic_prepare_to_resend_writes(data);
1965 pnfs_generic_commit_release(data);
1966 return -EAGAIN;
1967}
1968
1969static int
1970ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1971 int how, struct nfs_commit_info *cinfo)
1972{
1973 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1974 ff_layout_initiate_commit);
1975}
1976
1977static struct pnfs_ds_commit_info *
1978ff_layout_get_ds_info(struct inode *inode)
1979{
1980 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1981
1982 if (layout == NULL)
1983 return NULL;
1984
1985 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1986}
1987
1988static void
fc87701b 1989ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1990{
1991 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1992 id_node));
1993}
1994
5ba6a09e 1995static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
5b9b3c85
TM		 1996 const struct nfs4_layoutreturn_args *args,
1997 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1998{
d67ae825 1999 __be32 *start;
d67ae825
TH		 2000
2001 start = xdr_reserve_space(xdr, 4);
2002 if (unlikely(!start))
2003 return -E2BIG;
2004
5b9b3c85 2005 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 2006 /* This assume we always return _ALL_ layouts */
5b9b3c85 2007 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 2008}
2009
230bc962
TM		 2010static void
2011encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2012{
ab6e9aaf 2013 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
230bc962
TM		 2014}
2015
2016static void
2017ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2018 const nfs4_stateid *stateid,
2019 const struct nfs42_layoutstat_devinfo *devinfo)
2020{
2021 __be32 *p;
2022
2023 p = xdr_reserve_space(xdr, 8 + 8);
2024 p = xdr_encode_hyper(p, devinfo->offset);
2025 p = xdr_encode_hyper(p, devinfo->length);
2026 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2027 p = xdr_reserve_space(xdr, 4*8);
2028 p = xdr_encode_hyper(p, devinfo->read_count);
2029 p = xdr_encode_hyper(p, devinfo->read_bytes);
2030 p = xdr_encode_hyper(p, devinfo->write_count);
2031 p = xdr_encode_hyper(p, devinfo->write_bytes);
2032 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2033}
2034
2035static void
2036ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2037 const nfs4_stateid *stateid,
2038 const struct nfs42_layoutstat_devinfo *devinfo)
2039{
2040 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2041 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2042 devinfo->ld_private.data);
2043}
2044
d67ae825 2045/* report nothing for now */
230bc962
TM		 2046static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2047 const struct nfs4_layoutreturn_args *args,
2048 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 2049{
2050 __be32 *p;
230bc962 2051 int i;
d67ae825
TH		 2052
2053 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 2054 *p = cpu_to_be32(ff_args->num_dev);
2055 for (i = 0; i < ff_args->num_dev; i++)
2056 ff_layout_encode_ff_iostat(xdr,
2057 &args->layout->plh_stateid,
2058 &ff_args->devinfo[i]);
2059}
2060
2061static void
2062ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2063 unsigned int num_entries)
2064{
2065 unsigned int i;
2066
2067 for (i = 0; i < num_entries; i++) {
2068 if (!devinfo[i].ld_private.ops)
2069 continue;
2070 if (!devinfo[i].ld_private.ops->free)
2071 continue;
2072 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2073 }
d67ae825
TH		 2074}
2075
2076static struct nfs4_deviceid_node *
2077ff_layout_alloc_deviceid_node(struct nfs_server *server,
2078 struct pnfs_device *pdev, gfp_t gfp_flags)
2079{
2080 struct nfs4_ff_layout_ds *dsaddr;
2081
2082 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2083 if (!dsaddr)
2084 return NULL;
2085 return &dsaddr->id_node;
2086}
2087
2088static void
94e5c571 2089ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2090 const void *voidargs,
2091 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2092{
5b9b3c85 2093 const struct nfs4_layoutreturn_args *args = voidargs;
5ba6a09e 2094 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
d9152114
TM		 2095 struct xdr_buf tmp_buf = {
2096 .head = {
2097 [0] = {
2098 .iov_base = page_address(ff_args->pages[0]),
2099 },
2100 },
2101 .buflen = PAGE_SIZE,
2102 };
2103 struct xdr_stream tmp_xdr;
d67ae825
TH		 2104 __be32 *start;
2105
2106 dprintk("%s: Begin\n", __func__);
d67ae825 2107
0ccc61b1 2108 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
d9152114
TM		 2109
2110 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2111 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2112
2113 start = xdr_reserve_space(xdr, 4);
2114 *start = cpu_to_be32(tmp_buf.len);
2115 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
082fa37d 2116
d67ae825
TH		 2117 dprintk("%s: Return\n", __func__);
2118}
2119
5b9b3c85
TM		 2120static void
2121ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2122{
2123 struct nfs4_flexfile_layoutreturn_args *ff_args;
2124
2125 if (!args->data)
2126 return;
2127 ff_args = args->data;
2128 args->data = NULL;
2129
2130 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2131 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85 2132
d9152114 2133 put_page(ff_args->pages[0]);
5b9b3c85
TM		 2134 kfree(ff_args);
2135}
2136
2e54b9b1 2137static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
5b9b3c85
TM		 2138 .encode = ff_layout_encode_layoutreturn,
2139 .free = ff_layout_free_layoutreturn,
2140};
2141
2142static int
2143ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2144{
2145 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2146 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85
TM		 2147
2148 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2149 if (!ff_args)
d9152114
TM		 2150 goto out_nomem;
2151 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2152 if (!ff_args->pages[0])
2153 goto out_nomem_free;
5b9b3c85
TM		 2154
2155 INIT_LIST_HEAD(&ff_args->errors);
2156 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2157 &args->range, &ff_args->errors,
2158 FF_LAYOUTRETURN_MAXERR);
2159
230bc962
TM		 2160 spin_lock(&args->inode->i_lock);
2161 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2162 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2163 spin_unlock(&args->inode->i_lock);
2164
5b9b3c85
TM		 2165 args->ld_private->ops = &layoutreturn_ops;
2166 args->ld_private->data = ff_args;
2167 return 0;
d9152114
TM		 2168out_nomem_free:
2169 kfree(ff_args);
2170out_nomem:
2171 return -ENOMEM;
5b9b3c85
TM		 2172}
2173
f0922a6c
TM		 2174#ifdef CONFIG_NFS_V4_2
2175void
2176ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2177{
2178 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2179 struct nfs42_layout_error *errors;
2180 LIST_HEAD(head);
2181
2182 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2183 return;
2184 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2185 if (list_empty(&head))
2186 return;
2187
2188 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX,
2189 sizeof(*errors), GFP_NOFS);
2190 if (errors != NULL) {
2191 const struct nfs4_ff_layout_ds_err *pos;
2192 size_t n = 0;
2193
2194 list_for_each_entry(pos, &head, list) {
2195 errors[n].offset = pos->offset;
2196 errors[n].length = pos->length;
2197 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2198 errors[n].errors[0].dev_id = pos->deviceid;
2199 errors[n].errors[0].status = pos->status;
2200 errors[n].errors[0].opnum = pos->opnum;
2201 n++;
2202 if (!list_is_last(&pos->list, &head) &&
2203 n < NFS42_LAYOUTERROR_MAX)
2204 continue;
2205 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2206 break;
2207 n = 0;
2208 }
2209 kfree(errors);
2210 }
2211 ff_layout_free_ds_ioerr(&head);
2212}
2213#else
2214void
2215ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2216{
2217}
2218#endif
2219
27c43064
PT		 2220static int
2221ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2222{
2223 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2224
2225 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2226}
2227
2228static size_t
2229ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2230 const int buflen)
2231{
2232 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2233 const struct in6_addr *addr = &sin6->sin6_addr;
2234
2235 /*
2236 * RFC 4291, Section 2.2.2
2237 *
2238 * Shorthanded ANY address
2239 */
2240 if (ipv6_addr_any(addr))
2241 return snprintf(buf, buflen, "::");
2242
2243 /*
2244 * RFC 4291, Section 2.2.2
2245 *
2246 * Shorthanded loopback address
2247 */
2248 if (ipv6_addr_loopback(addr))
2249 return snprintf(buf, buflen, "::1");
2250
2251 /*
2252 * RFC 4291, Section 2.2.3
2253 *
2254 * Special presentation address format for mapped v4
2255 * addresses.
2256 */
2257 if (ipv6_addr_v4mapped(addr))
2258 return snprintf(buf, buflen, "::ffff:%pI4",
2259 &addr->s6_addr32[3]);
2260
2261 /*
2262 * RFC 4291, Section 2.2.1
2263 */
2264 return snprintf(buf, buflen, "%pI6c", addr);
2265}
2266
2267/* Derived from rpc_sockaddr2uaddr */
2268static void
2269ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2270{
2271 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2272 char portbuf[RPCBIND_MAXUADDRPLEN];
2273 char addrbuf[RPCBIND_MAXUADDRLEN];
2274 char *netid;
2275 unsigned short port;
2276 int len, netid_len;
2277 __be32 *p;
2278
2279 switch (sap->sa_family) {
2280 case AF_INET:
2281 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2282 return;
2283 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2284 netid = "tcp";
2285 netid_len = 3;
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);
2291 netid = "tcp6";
2292 netid_len = 4;
2293 break;
2294 default:
2295 /* we only support tcp and tcp6 */
2296 WARN_ON_ONCE(1);
2297 return;
2298 }
2299
2300 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2301 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2302
2303 p = xdr_reserve_space(xdr, 4 + netid_len);
2304 xdr_encode_opaque(p, netid, netid_len);
2305
2306 p = xdr_reserve_space(xdr, 4 + len);
2307 xdr_encode_opaque(p, addrbuf, len);
2308}
2309
2310static void
2311ff_layout_encode_nfstime(struct xdr_stream *xdr,
2312 ktime_t t)
2313{
2314 struct timespec64 ts;
2315 __be32 *p;
2316
2317 p = xdr_reserve_space(xdr, 12);
2318 ts = ktime_to_timespec64(t);
2319 p = xdr_encode_hyper(p, ts.tv_sec);
2320 *p++ = cpu_to_be32(ts.tv_nsec);
2321}
2322
2323static void
2324ff_layout_encode_io_latency(struct xdr_stream *xdr,
2325 struct nfs4_ff_io_stat *stat)
2326{
2327 __be32 *p;
2328
2329 p = xdr_reserve_space(xdr, 5 * 8);
2330 p = xdr_encode_hyper(p, stat->ops_requested);
2331 p = xdr_encode_hyper(p, stat->bytes_requested);
2332 p = xdr_encode_hyper(p, stat->ops_completed);
2333 p = xdr_encode_hyper(p, stat->bytes_completed);
2334 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2335 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2336 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2337}
2338
2339static void
422c93c8
TM		 2340ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2341 const struct nfs42_layoutstat_devinfo *devinfo,
2342 struct nfs4_ff_layout_mirror *mirror)
27c43064 2343{
27c43064
PT		 2344 struct nfs4_pnfs_ds_addr *da;
2345 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2346 struct nfs_fh *fh = &mirror->fh_versions[0];
422c93c8 2347 __be32 *p;
27c43064
PT		 2348
2349 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2350 dprintk("%s: DS %s: encoding address %s\n",
2351 __func__, ds->ds_remotestr, da->da_remotestr);
27c43064
PT		 2352 /* netaddr4 */
2353 ff_layout_encode_netaddr(xdr, da);
2354 /* nfs_fh4 */
2355 p = xdr_reserve_space(xdr, 4 + fh->size);
2356 xdr_encode_opaque(p, fh->data, fh->size);
2357 /* ff_io_latency4 read */
2358 spin_lock(&mirror->lock);
2359 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2360 /* ff_io_latency4 write */
2361 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2362 spin_unlock(&mirror->lock);
2363 /* nfstime4 */
2364 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2365 /* bool */
2366 p = xdr_reserve_space(xdr, 4);
2367 *p = cpu_to_be32(false);
422c93c8
TM		 2368}
2369
2370static void
2371ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2372 const struct nfs4_xdr_opaque_data *opaque)
2373{
2374 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2375 struct nfs42_layoutstat_devinfo, ld_private);
2376 __be32 *start;
2377
2378 /* layoutupdate length */
2379 start = xdr_reserve_space(xdr, 4);
2380 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
27c43064
PT		 2381
2382 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2383}
2384
422c93c8
TM		 2385static void
2386ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2387{
2388 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2389
2390 ff_layout_put_mirror(mirror);
2391}
2392
2393static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2394 .encode = ff_layout_encode_layoutstats,
2395 .free = ff_layout_free_layoutstats,
2396};
2397
266d12d4 2398static int
08e2e5bc
TM		 2399ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2400 struct nfs42_layoutstat_devinfo *devinfo,
266d12d4 2401 int dev_limit)
ad4dc53e 2402{
266d12d4 2403 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2404 struct nfs4_ff_layout_mirror *mirror;
2405 struct nfs4_deviceid_node *dev;
266d12d4 2406 int i = 0;
ad4dc53e 2407
266d12d4
TM		 2408 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2409 if (i >= dev_limit)
ad4dc53e 2410 break;
65990d1a 2411 if (IS_ERR_OR_NULL(mirror->mirror_ds))
27c43064 2412 continue;
06946c6a
TM		 2413 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2414 continue;
266d12d4 2415 /* mirror refcount put in cleanup_layoutstats */
81a090b9 2416 if (!refcount_inc_not_zero(&mirror->ref))
266d12d4
TM		 2417 continue;
2418 dev = &mirror->mirror_ds->id_node;
ad4dc53e 2419 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2420 devinfo->offset = 0;
2421 devinfo->length = NFS4_MAX_UINT64;
2f8220c1 2422 spin_lock(&mirror->lock);
d099d7b8 2423 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2424 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2425 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e 2426 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2f8220c1 2427 spin_unlock(&mirror->lock);
ad4dc53e 2428 devinfo->layout_type = LAYOUT_FLEX_FILES;
422c93c8
TM		 2429 devinfo->ld_private.ops = &layoutstat_ops;
2430 devinfo->ld_private.data = mirror;
ad4dc53e 2431
08e2e5bc 2432 devinfo++;
266d12d4 2433 i++;
ad4dc53e 2434 }
266d12d4 2435 return i;
ad4dc53e
PT		 2436}
2437
2438static int
2439ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2440{
266d12d4 2441 struct nfs4_flexfile_layout *ff_layout;
08e2e5bc 2442 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
ad4dc53e 2443
ad4dc53e 2444 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
266d12d4 2445 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2446 if (!args->devinfo)
2447 return -ENOMEM;
2448
ad4dc53e 2449 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2450 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2451 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2452 &args->devinfo[0], dev_count);
ad4dc53e 2453 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2454 if (!args->num_dev) {
2455 kfree(args->devinfo);
2456 args->devinfo = NULL;
2457 return -ENOENT;
2458 }
ad4dc53e
PT		 2459
2460 return 0;
2461}
2462
76b2a303
TM		 2463static int
2464ff_layout_set_layoutdriver(struct nfs_server *server,
2465 const struct nfs_fh *dummy)
2466{
2467#if IS_ENABLED(CONFIG_NFS_V4_2)
2468 server->caps |= NFS_CAP_LAYOUTSTATS;
2469#endif
2470 return 0;
2471}
2472
d67ae825
TH		 2473static struct pnfs_layoutdriver_type flexfilelayout_type = {
2474 .id = LAYOUT_FLEX_FILES,
2475 .name = "LAYOUT_FLEX_FILES",
2476 .owner = THIS_MODULE,
f86c3ac5 2477 .flags = PNFS_LAYOUTGET_ON_OPEN,
28ced9a8 2478 .max_layoutget_response = 4096, /* 1 page or so... */
76b2a303 2479 .set_layoutdriver = ff_layout_set_layoutdriver,
d67ae825
TH		 2480 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2481 .free_layout_hdr = ff_layout_free_layout_hdr,
2482 .alloc_lseg = ff_layout_alloc_lseg,
2483 .free_lseg = ff_layout_free_lseg,
0762ed2c 2484 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2485 .pg_read_ops = &ff_layout_pg_read_ops,
2486 .pg_write_ops = &ff_layout_pg_write_ops,
2487 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2488 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 2489 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 2490 .clear_request_commit = pnfs_generic_clear_request_commit,
2491 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2492 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2493 .commit_pagelist = ff_layout_commit_pagelist,
2494 .read_pagelist = ff_layout_read_pagelist,
2495 .write_pagelist = ff_layout_write_pagelist,
2496 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2497 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2498 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2499 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2500};
2501
2502static int __init nfs4flexfilelayout_init(void)
2503{
2504 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2505 __func__);
2506 return pnfs_register_layoutdriver(&flexfilelayout_type);
2507}
2508
2509static void __exit nfs4flexfilelayout_exit(void)
2510{
2511 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2512 __func__);
2513 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2514}
2515
2516MODULE_ALIAS("nfs-layouttype4-4");
2517
2518MODULE_LICENSE("GPL");
2519MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2520
2521module_init(nfs4flexfilelayout_init);
2522module_exit(nfs4flexfilelayout_exit);
33344e0f
TM		 2523
2524module_param(io_maxretrans, ushort, 0644);
2525MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
2526 "retries an I/O request before returning an error. ");
Linux 6.x block layer and io_uring tree(s)