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Merge tag 'drm-intel-fixes-2018-12-12-1' of git://anongit.freedesktop.org/drm/drm...
[thirdparty/linux.git] / fs / nfs / flexfilelayout / flexfilelayout.c
CommitLineData
d67ae825
TH		 1/*
2 * Module for pnfs flexfile layout driver.
3 *
4 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
5 *
6 * Tao Peng <bergwolf@primarydata.com>
7 */
8
9#include <linux/nfs_fs.h>
10#include <linux/nfs_page.h>
11#include <linux/module.h>
12
13#include <linux/sunrpc/metrics.h>
d67ae825
TH		 14
15#include "flexfilelayout.h"
16#include "../nfs4session.h"
40c64c26 17#include "../nfs4idmap.h"
d67ae825
TH		 18#include "../internal.h"
19#include "../delegation.h"
20#include "../nfs4trace.h"
21#include "../iostat.h"
22#include "../nfs.h"
ad4dc53e 23#include "../nfs42.h"
d67ae825
TH		 24
25#define NFSDBG_FACILITY NFSDBG_PNFS_LD
26
27#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
5b9b3c85
TM		 28#define FF_LAYOUTRETURN_MAXERR 20
29
d67ae825 30
90a0be00
JL		 31static struct group_info *ff_zero_group;
32
54e4a0df
TM		 33static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
34 struct nfs_pgio_header *hdr);
230bc962
TM		 35static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
36 struct nfs42_layoutstat_devinfo *devinfo,
37 int dev_limit);
38static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
39 const struct nfs42_layoutstat_devinfo *devinfo,
40 struct nfs4_ff_layout_mirror *mirror);
54e4a0df 41
d67ae825
TH		 42static struct pnfs_layout_hdr *
43ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
44{
45 struct nfs4_flexfile_layout *ffl;
46
47 ffl = kzalloc(sizeof(*ffl), gfp_flags);
48 if (ffl) {
49 INIT_LIST_HEAD(&ffl->error_list);
266d12d4 50 INIT_LIST_HEAD(&ffl->mirrors);
1c8d477a 51 ffl->last_report_time = ktime_get();
d67ae825
TH		 52 return &ffl->generic_hdr;
53 } else
54 return NULL;
55}
56
57static void
58ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
59{
60 struct nfs4_ff_layout_ds_err *err, *n;
61
62 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
63 list) {
64 list_del(&err->list);
65 kfree(err);
66 }
67 kfree(FF_LAYOUT_FROM_HDR(lo));
68}
69
93b717fd 70static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
d67ae825
TH		 71{
72 __be32 *p;
73
74 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
75 if (unlikely(p == NULL))
76 return -ENOBUFS;
93b717fd
TM		 77 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
78 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
d67ae825
TH		 79 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
80 p[0], p[1], p[2], p[3]);
81 return 0;
82}
83
84static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
85{
86 __be32 *p;
87
88 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
89 if (unlikely(!p))
90 return -ENOBUFS;
91 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
92 nfs4_print_deviceid(devid);
93 return 0;
94}
95
96static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
97{
98 __be32 *p;
99
100 p = xdr_inline_decode(xdr, 4);
101 if (unlikely(!p))
102 return -ENOBUFS;
103 fh->size = be32_to_cpup(p++);
104 if (fh->size > sizeof(struct nfs_fh)) {
105 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
106 fh->size);
107 return -EOVERFLOW;
108 }
109 /* fh.data */
110 p = xdr_inline_decode(xdr, fh->size);
111 if (unlikely(!p))
112 return -ENOBUFS;
113 memcpy(&fh->data, p, fh->size);
114 dprintk("%s: fh len %d\n", __func__, fh->size);
115
116 return 0;
117}
118
119/*
120 * Currently only stringified uids and gids are accepted.
121 * I.e., kerberos is not supported to the DSes, so no pricipals.
122 *
123 * That means that one common function will suffice, but when
124 * principals are added, this should be split to accomodate
125 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
126 */
127static int
128decode_name(struct xdr_stream *xdr, u32 *id)
129{
130 __be32 *p;
131 int len;
132
133 /* opaque_length(4)*/
134 p = xdr_inline_decode(xdr, 4);
135 if (unlikely(!p))
136 return -ENOBUFS;
137 len = be32_to_cpup(p++);
138 if (len < 0)
139 return -EINVAL;
140
141 dprintk("%s: len %u\n", __func__, len);
142
143 /* opaque body */
144 p = xdr_inline_decode(xdr, len);
145 if (unlikely(!p))
146 return -ENOBUFS;
147
148 if (!nfs_map_string_to_numeric((char *)p, len, id))
149 return -EINVAL;
150
151 return 0;
152}
153
266d12d4
TM		 154static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
155 const struct nfs4_ff_layout_mirror *m2)
156{
157 int i, j;
158
159 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
160 return false;
161 for (i = 0; i < m1->fh_versions_cnt; i++) {
162 bool found_fh = false;
86fb449b 163 for (j = 0; j < m2->fh_versions_cnt; j++) {
266d12d4
TM		 164 if (nfs_compare_fh(&m1->fh_versions[i],
165 &m2->fh_versions[j]) == 0) {
166 found_fh = true;
167 break;
168 }
169 }
170 if (!found_fh)
171 return false;
172 }
173 return true;
174}
175
176static struct nfs4_ff_layout_mirror *
177ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
178 struct nfs4_ff_layout_mirror *mirror)
179{
180 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
181 struct nfs4_ff_layout_mirror *pos;
182 struct inode *inode = lo->plh_inode;
183
184 spin_lock(&inode->i_lock);
185 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
65990d1a 186 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
266d12d4
TM		 187 continue;
188 if (!ff_mirror_match_fh(mirror, pos))
189 continue;
81a090b9 190 if (refcount_inc_not_zero(&pos->ref)) {
266d12d4
TM		 191 spin_unlock(&inode->i_lock);
192 return pos;
193 }
194 }
195 list_add(&mirror->mirrors, &ff_layout->mirrors);
196 mirror->layout = lo;
197 spin_unlock(&inode->i_lock);
198 return mirror;
199}
200
e3b1df2d 201static void
266d12d4
TM		 202ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
203{
204 struct inode *inode;
205 if (mirror->layout == NULL)
206 return;
207 inode = mirror->layout->plh_inode;
208 spin_lock(&inode->i_lock);
209 list_del(&mirror->mirrors);
210 spin_unlock(&inode->i_lock);
211 mirror->layout = NULL;
212}
213
28a0d72c
TM		 214static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
215{
216 struct nfs4_ff_layout_mirror *mirror;
217
218 mirror = kzalloc(sizeof(*mirror), gfp_flags);
219 if (mirror != NULL) {
220 spin_lock_init(&mirror->lock);
81a090b9 221 refcount_set(&mirror->ref, 1);
266d12d4 222 INIT_LIST_HEAD(&mirror->mirrors);
28a0d72c
TM		 223 }
224 return mirror;
225}
226
227static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
228{
3064b686
JL		 229 struct rpc_cred *cred;
230
266d12d4 231 ff_layout_remove_mirror(mirror);
28a0d72c 232 kfree(mirror->fh_versions);
3064b686
JL		 233 cred = rcu_access_pointer(mirror->ro_cred);
234 if (cred)
235 put_rpccred(cred);
236 cred = rcu_access_pointer(mirror->rw_cred);
237 if (cred)
238 put_rpccred(cred);
28a0d72c
TM		 239 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
240 kfree(mirror);
241}
242
243static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
244{
81a090b9 245 if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
28a0d72c
TM		 246 ff_layout_free_mirror(mirror);
247}
248
d67ae825
TH		 249static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
250{
251 int i;
252
253 if (fls->mirror_array) {
254 for (i = 0; i < fls->mirror_array_cnt; i++) {
255 /* normally mirror_ds is freed in
256 * .free_deviceid_node but we still do it here
257 * for .alloc_lseg error path */
28a0d72c 258 ff_layout_put_mirror(fls->mirror_array[i]);
d67ae825
TH		 259 }
260 kfree(fls->mirror_array);
261 fls->mirror_array = NULL;
262 }
263}
264
265static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
266{
267 int ret = 0;
268
269 dprintk("--> %s\n", __func__);
270
271 /* FIXME: remove this check when layout segment support is added */
272 if (lgr->range.offset != 0 ||
273 lgr->range.length != NFS4_MAX_UINT64) {
274 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
275 __func__);
276 ret = -EINVAL;
277 }
278
279 dprintk("--> %s returns %d\n", __func__, ret);
280 return ret;
281}
282
283static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
284{
285 if (fls) {
286 ff_layout_free_mirror_array(fls);
287 kfree(fls);
288 }
289}
290
0762ed2c
TM		 291static bool
292ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
293 const struct pnfs_layout_range *l2)
294{
295 u64 end1, end2;
296
297 if (l1->iomode != l2->iomode)
298 return l1->iomode != IOMODE_READ;
299 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
300 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
301 if (end1 < l2->offset)
302 return false;
303 if (end2 < l1->offset)
304 return true;
305 return l2->offset <= l1->offset;
306}
307
308static bool
309ff_lseg_merge(struct pnfs_layout_segment *new,
310 struct pnfs_layout_segment *old)
311{
312 u64 new_end, old_end;
313
ee26bdd6
JL		 314 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
315 return false;
0762ed2c
TM		 316 if (new->pls_range.iomode != old->pls_range.iomode)
317 return false;
318 old_end = pnfs_calc_offset_end(old->pls_range.offset,
319 old->pls_range.length);
320 if (old_end < new->pls_range.offset)
321 return false;
322 new_end = pnfs_calc_offset_end(new->pls_range.offset,
323 new->pls_range.length);
324 if (new_end < old->pls_range.offset)
325 return false;
326
327 /* Mergeable: copy info from 'old' to 'new' */
328 if (new_end < old_end)
329 new_end = old_end;
330 if (new->pls_range.offset < old->pls_range.offset)
331 new->pls_range.offset = old->pls_range.offset;
332 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
333 new_end);
334 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
335 set_bit(NFS_LSEG_ROC, &new->pls_flags);
0762ed2c
TM		 336 return true;
337}
338
339static void
340ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
341 struct pnfs_layout_segment *lseg,
342 struct list_head *free_me)
343{
344 pnfs_generic_layout_insert_lseg(lo, lseg,
345 ff_lseg_range_is_after,
346 ff_lseg_merge,
347 free_me);
348}
349
d67ae825
TH		 350static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
351{
d67ae825
TH		 352 int i, j;
353
354 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
355 for (j = i + 1; j < fls->mirror_array_cnt; j++)
356 if (fls->mirror_array[i]->efficiency <
455b6ee6
FF		 357 fls->mirror_array[j]->efficiency)
358 swap(fls->mirror_array[i],
359 fls->mirror_array[j]);
d67ae825
TH		 360 }
361}
362
363static struct pnfs_layout_segment *
364ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
365 struct nfs4_layoutget_res *lgr,
366 gfp_t gfp_flags)
367{
368 struct pnfs_layout_segment *ret;
369 struct nfs4_ff_layout_segment *fls = NULL;
370 struct xdr_stream stream;
371 struct xdr_buf buf;
372 struct page *scratch;
373 u64 stripe_unit;
374 u32 mirror_array_cnt;
375 __be32 *p;
376 int i, rc;
377
378 dprintk("--> %s\n", __func__);
379 scratch = alloc_page(gfp_flags);
380 if (!scratch)
381 return ERR_PTR(-ENOMEM);
382
383 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
384 lgr->layoutp->len);
385 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
386
387 /* stripe unit and mirror_array_cnt */
388 rc = -EIO;
389 p = xdr_inline_decode(&stream, 8 + 4);
390 if (!p)
391 goto out_err_free;
392
393 p = xdr_decode_hyper(p, &stripe_unit);
394 mirror_array_cnt = be32_to_cpup(p++);
395 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
396 stripe_unit, mirror_array_cnt);
397
398 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
399 mirror_array_cnt == 0)
400 goto out_err_free;
401
402 rc = -ENOMEM;
403 fls = kzalloc(sizeof(*fls), gfp_flags);
404 if (!fls)
405 goto out_err_free;
406
407 fls->mirror_array_cnt = mirror_array_cnt;
408 fls->stripe_unit = stripe_unit;
409 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
410 sizeof(fls->mirror_array[0]), gfp_flags);
411 if (fls->mirror_array == NULL)
412 goto out_err_free;
413
414 for (i = 0; i < fls->mirror_array_cnt; i++) {
266d12d4 415 struct nfs4_ff_layout_mirror *mirror;
90a0be00 416 struct auth_cred acred = { .group_info = ff_zero_group };
3064b686 417 struct rpc_cred __rcu *cred;
90a0be00 418 u32 ds_count, fh_count, id;
d67ae825
TH		 419 int j;
420
421 rc = -EIO;
422 p = xdr_inline_decode(&stream, 4);
423 if (!p)
424 goto out_err_free;
425 ds_count = be32_to_cpup(p);
426
427 /* FIXME: allow for striping? */
428 if (ds_count != 1)
429 goto out_err_free;
430
28a0d72c 431 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
d67ae825
TH		 432 if (fls->mirror_array[i] == NULL) {
433 rc = -ENOMEM;
434 goto out_err_free;
435 }
436
d67ae825
TH		 437 fls->mirror_array[i]->ds_count = ds_count;
438
439 /* deviceid */
65990d1a 440 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
d67ae825
TH		 441 if (rc)
442 goto out_err_free;
443
d67ae825
TH		 444 /* efficiency */
445 rc = -EIO;
446 p = xdr_inline_decode(&stream, 4);
447 if (!p)
448 goto out_err_free;
449 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
450
451 /* stateid */
93b717fd 452 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
d67ae825
TH		 453 if (rc)
454 goto out_err_free;
455
456 /* fh */
662f9a10 457 rc = -EIO;
d67ae825
TH		 458 p = xdr_inline_decode(&stream, 4);
459 if (!p)
460 goto out_err_free;
461 fh_count = be32_to_cpup(p);
462
463 fls->mirror_array[i]->fh_versions =
6396bb22 464 kcalloc(fh_count, sizeof(struct nfs_fh),
d67ae825
TH		 465 gfp_flags);
466 if (fls->mirror_array[i]->fh_versions == NULL) {
467 rc = -ENOMEM;
468 goto out_err_free;
469 }
470
471 for (j = 0; j < fh_count; j++) {
472 rc = decode_nfs_fh(&stream,
473 &fls->mirror_array[i]->fh_versions[j]);
474 if (rc)
475 goto out_err_free;
476 }
477
478 fls->mirror_array[i]->fh_versions_cnt = fh_count;
479
480 /* user */
90a0be00 481 rc = decode_name(&stream, &id);
d67ae825
TH		 482 if (rc)
483 goto out_err_free;
484
90a0be00
JL		 485 acred.uid = make_kuid(&init_user_ns, id);
486
d67ae825 487 /* group */
90a0be00 488 rc = decode_name(&stream, &id);
d67ae825
TH		 489 if (rc)
490 goto out_err_free;
491
90a0be00
JL		 492 acred.gid = make_kgid(&init_user_ns, id);
493
494 /* find the cred for it */
3064b686 495 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
90a0be00
JL		 496 if (IS_ERR(cred)) {
497 rc = PTR_ERR(cred);
498 goto out_err_free;
499 }
500
3064b686
JL		 501 if (lgr->range.iomode == IOMODE_READ)
502 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
503 else
504 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
90a0be00 505
266d12d4
TM		 506 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
507 if (mirror != fls->mirror_array[i]) {
90a0be00 508 /* swap cred ptrs so free_mirror will clean up old */
3064b686
JL		 509 if (lgr->range.iomode == IOMODE_READ) {
510 cred = xchg(&mirror->ro_cred, cred);
511 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
512 } else {
513 cred = xchg(&mirror->rw_cred, cred);
514 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
515 }
266d12d4
TM		 516 ff_layout_free_mirror(fls->mirror_array[i]);
517 fls->mirror_array[i] = mirror;
518 }
519
3064b686
JL		 520 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
521 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
90a0be00
JL		 522 from_kuid(&init_user_ns, acred.uid),
523 from_kgid(&init_user_ns, acred.gid));
d67ae825
TH		 524 }
525
c0f5f505 526 p = xdr_inline_decode(&stream, 4);
d0379a5d
TM		 527 if (!p)
528 goto out_sort_mirrors;
529 fls->flags = be32_to_cpup(p);
530
531 p = xdr_inline_decode(&stream, 4);
532 if (!p)
533 goto out_sort_mirrors;
534 for (i=0; i < fls->mirror_array_cnt; i++)
535 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
c0f5f505 536
d0379a5d 537out_sort_mirrors:
d67ae825
TH		 538 ff_layout_sort_mirrors(fls);
539 rc = ff_layout_check_layout(lgr);
540 if (rc)
541 goto out_err_free;
d67ae825
TH		 542 ret = &fls->generic_hdr;
543 dprintk("<-- %s (success)\n", __func__);
544out_free_page:
545 __free_page(scratch);
546 return ret;
547out_err_free:
548 _ff_layout_free_lseg(fls);
549 ret = ERR_PTR(rc);
550 dprintk("<-- %s (%d)\n", __func__, rc);
551 goto out_free_page;
552}
553
554static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
555{
556 struct pnfs_layout_segment *lseg;
557
558 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
559 if (lseg->pls_range.iomode == IOMODE_RW)
560 return true;
561
562 return false;
563}
564
565static void
566ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
567{
568 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 569
570 dprintk("--> %s\n", __func__);
571
d67ae825
TH		 572 if (lseg->pls_range.iomode == IOMODE_RW) {
573 struct nfs4_flexfile_layout *ffl;
574 struct inode *inode;
575
576 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
577 inode = ffl->generic_hdr.plh_inode;
578 spin_lock(&inode->i_lock);
579 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
580 ffl->commit_info.nbuckets = 0;
581 kfree(ffl->commit_info.buckets);
582 ffl->commit_info.buckets = NULL;
583 }
584 spin_unlock(&inode->i_lock);
585 }
586 _ff_layout_free_lseg(fls);
587}
588
589/* Return 1 until we have multiple lsegs support */
590static int
591ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
592{
593 return 1;
594}
595
abcb7bfc 596static void
e76d28dd 597nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 598{
9bbd9bb4
PT		 599 /* first IO request? */
600 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 601 timer->start_time = now;
abcb7bfc
TM		 602 }
603}
604
605static ktime_t
e76d28dd 606nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 607{
e76d28dd 608 ktime_t start;
abcb7bfc 609
9bbd9bb4
PT		 610 if (atomic_dec_return(&timer->n_ops) < 0)
611 WARN_ON_ONCE(1);
612
9bbd9bb4
PT		 613 start = timer->start_time;
614 timer->start_time = now;
abcb7bfc
TM		 615 return ktime_sub(now, start);
616}
617
97ba375b 618static bool
d983803d 619nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 620 struct nfs4_ff_layoutstat *layoutstat,
621 ktime_t now)
abcb7bfc 622{
bbf58bf3 623 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
1c8d477a 624 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
d983803d 625
e76d28dd 626 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
1f3a8e49 627 if (!mirror->start_time)
9bbd9bb4 628 mirror->start_time = now;
d0379a5d
TM		 629 if (mirror->report_interval != 0)
630 report_interval = (s64)mirror->report_interval * 1000LL;
631 else if (layoutstats_timer != 0)
bbf58bf3 632 report_interval = (s64)layoutstats_timer * 1000LL;
1c8d477a 633 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
bbf58bf3 634 report_interval) {
1c8d477a 635 ffl->last_report_time = now;
97ba375b
PT		 636 return true;
637 }
638
639 return false;
abcb7bfc
TM		 640}
641
642static void
643nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
644 __u64 requested)
645{
646 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
647
648 iostat->ops_requested++;
649 iostat->bytes_requested += requested;
650}
651
652static void
653nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
654 __u64 requested,
655 __u64 completed,
e76d28dd
TM		 656 ktime_t time_completed,
657 ktime_t time_started)
abcb7bfc
TM		 658{
659 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 660 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 661 ktime_t timer;
662
663 iostat->ops_completed++;
664 iostat->bytes_completed += completed;
665 iostat->bytes_not_delivered += requested - completed;
666
e76d28dd 667 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 668 iostat->total_busy_time =
669 ktime_add(iostat->total_busy_time, timer);
670 iostat->aggregate_completion_time =
e76d28dd
TM		 671 ktime_add(iostat->aggregate_completion_time,
672 completion_time);
abcb7bfc
TM		 673}
674
675static void
0b7baf94
TM		 676nfs4_ff_layout_stat_io_start_read(struct inode *inode,
677 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 678 __u64 requested, ktime_t now)
abcb7bfc 679{
97ba375b
PT		 680 bool report;
681
abcb7bfc 682 spin_lock(&mirror->lock);
e76d28dd 683 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
abcb7bfc 684 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
06946c6a 685 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 686 spin_unlock(&mirror->lock);
97ba375b
PT		 687
688 if (report)
0b7baf94 689 pnfs_report_layoutstat(inode, GFP_KERNEL);
abcb7bfc
TM		 690}
691
692static void
693nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
694 struct nfs4_ff_layout_mirror *mirror,
695 __u64 requested,
696 __u64 completed)
697{
698 spin_lock(&mirror->lock);
699 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
700 requested, completed,
e76d28dd 701 ktime_get(), task->tk_start);
06946c6a 702 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 703 spin_unlock(&mirror->lock);
704}
705
706static void
0b7baf94
TM		 707nfs4_ff_layout_stat_io_start_write(struct inode *inode,
708 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 709 __u64 requested, ktime_t now)
abcb7bfc 710{
97ba375b
PT		 711 bool report;
712
abcb7bfc 713 spin_lock(&mirror->lock);
e76d28dd 714 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc 715 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
06946c6a 716 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 717 spin_unlock(&mirror->lock);
97ba375b
PT		 718
719 if (report)
0b7baf94 720 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 721}
722
723static void
724nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
725 struct nfs4_ff_layout_mirror *mirror,
726 __u64 requested,
727 __u64 completed,
728 enum nfs3_stable_how committed)
729{
730 if (committed == NFS_UNSTABLE)
731 requested = completed = 0;
732
733 spin_lock(&mirror->lock);
734 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 735 requested, completed, ktime_get(), task->tk_start);
06946c6a 736 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 737 spin_unlock(&mirror->lock);
738}
739
d67ae825
TH		 740static int
741ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
742 struct nfs_commit_info *cinfo,
743 gfp_t gfp_flags)
744{
745 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
746 struct pnfs_commit_bucket *buckets;
747 int size;
748
749 if (cinfo->ds->nbuckets != 0) {
750 /* This assumes there is only one RW lseg per file.
751 * To support multiple lseg per file, we need to
752 * change struct pnfs_commit_bucket to allow dynamic
753 * increasing nbuckets.
754 */
755 return 0;
756 }
757
758 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
759
760 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
761 gfp_flags);
762 if (!buckets)
763 return -ENOMEM;
764 else {
765 int i;
766
fe238e60 767 spin_lock(&cinfo->inode->i_lock);
d67ae825
TH		 768 if (cinfo->ds->nbuckets != 0)
769 kfree(buckets);
770 else {
771 cinfo->ds->buckets = buckets;
772 cinfo->ds->nbuckets = size;
773 for (i = 0; i < size; i++) {
774 INIT_LIST_HEAD(&buckets[i].written);
775 INIT_LIST_HEAD(&buckets[i].committing);
776 /* mark direct verifier as unset */
777 buckets[i].direct_verf.committed =
778 NFS_INVALID_STABLE_HOW;
779 }
780 }
fe238e60 781 spin_unlock(&cinfo->inode->i_lock);
d67ae825
TH		 782 return 0;
783 }
784}
785
786static struct nfs4_pnfs_ds *
13544412
TM		 787ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
788 int start_idx,
d67ae825
TH		 789 int *best_idx)
790{
13544412 791 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825 792 struct nfs4_pnfs_ds *ds;
3dc14735 793 bool fail_return = false;
d67ae825
TH		 794 int idx;
795
d67ae825 796 /* mirrors are sorted by efficiency */
13544412 797 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
3dc14735
TM		 798 if (idx+1 == fls->mirror_array_cnt)
799 fail_return = true;
800 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
d67ae825
TH		 801 if (ds) {
802 *best_idx = idx;
803 return ds;
804 }
805 }
806
807 return NULL;
808}
809
c7d73af2
TH		 810static void
811ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
812 struct nfs_page *req,
813 bool strict_iomode)
814{
c7d73af2
TH		 815 pnfs_put_lseg(pgio->pg_lseg);
816 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
817 req->wb_context,
818 0,
819 NFS4_MAX_UINT64,
820 IOMODE_READ,
821 strict_iomode,
822 GFP_KERNEL);
823 if (IS_ERR(pgio->pg_lseg)) {
824 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
825 pgio->pg_lseg = NULL;
826 }
c7d73af2
TH		 827}
828
d67ae825
TH		 829static void
830ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
831 struct nfs_page *req)
832{
833 struct nfs_pgio_mirror *pgm;
834 struct nfs4_ff_layout_mirror *mirror;
835 struct nfs4_pnfs_ds *ds;
836 int ds_idx;
837
3dc14735 838retry:
b3230e80 839 pnfs_generic_pg_check_layout(pgio);
d67ae825 840 /* Use full layout for now */
1c1aeaf1 841 if (!pgio->pg_lseg) {
c7d73af2 842 ff_layout_pg_get_read(pgio, req, false);
1c1aeaf1
TM		 843 if (!pgio->pg_lseg)
844 goto out_nolseg;
845 }
846 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
c7d73af2 847 ff_layout_pg_get_read(pgio, req, true);
1c1aeaf1
TM		 848 if (!pgio->pg_lseg)
849 goto out_nolseg;
850 }
d67ae825 851
13544412 852 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
446ca219 853 if (!ds) {
3dc14735 854 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 855 goto out_mds;
3dc14735
TM		 856 pnfs_put_lseg(pgio->pg_lseg);
857 pgio->pg_lseg = NULL;
858 /* Sleep for 1 second before retrying */
859 ssleep(1);
860 goto retry;
446ca219
TH		 861 }
862
d67ae825
TH		 863 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
864
865 pgio->pg_mirror_idx = ds_idx;
866
867 /* read always uses only one mirror - idx 0 for pgio layer */
868 pgm = &pgio->pg_mirrors[0];
869 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
870
871 return;
1c1aeaf1
TM		 872out_nolseg:
873 if (pgio->pg_error < 0)
874 return;
d67ae825
TH		 875out_mds:
876 pnfs_put_lseg(pgio->pg_lseg);
877 pgio->pg_lseg = NULL;
878 nfs_pageio_reset_read_mds(pgio);
879}
880
881static void
882ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
883 struct nfs_page *req)
884{
885 struct nfs4_ff_layout_mirror *mirror;
886 struct nfs_pgio_mirror *pgm;
887 struct nfs_commit_info cinfo;
888 struct nfs4_pnfs_ds *ds;
889 int i;
890 int status;
891
3dc14735 892retry:
b3230e80 893 pnfs_generic_pg_check_layout(pgio);
d600ad1f 894 if (!pgio->pg_lseg) {
d67ae825
TH		 895 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
896 req->wb_context,
897 0,
898 NFS4_MAX_UINT64,
899 IOMODE_RW,
c7d73af2 900 false,
d67ae825 901 GFP_NOFS);
d600ad1f
PT		 902 if (IS_ERR(pgio->pg_lseg)) {
903 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
904 pgio->pg_lseg = NULL;
905 return;
906 }
907 }
d67ae825
TH		 908 /* If no lseg, fall back to write through mds */
909 if (pgio->pg_lseg == NULL)
910 goto out_mds;
911
912 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
913 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
914 if (status < 0)
915 goto out_mds;
916
917 /* Use a direct mapping of ds_idx to pgio mirror_idx */
918 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
919 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
920 goto out_mds;
921
922 for (i = 0; i < pgio->pg_mirror_count; i++) {
923 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
446ca219 924 if (!ds) {
3dc14735 925 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 926 goto out_mds;
3dc14735
TM		 927 pnfs_put_lseg(pgio->pg_lseg);
928 pgio->pg_lseg = NULL;
929 /* Sleep for 1 second before retrying */
930 ssleep(1);
931 goto retry;
446ca219 932 }
d67ae825
TH		 933 pgm = &pgio->pg_mirrors[i];
934 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
935 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
936 }
937
938 return;
939
940out_mds:
941 pnfs_put_lseg(pgio->pg_lseg);
942 pgio->pg_lseg = NULL;
943 nfs_pageio_reset_write_mds(pgio);
944}
945
946static unsigned int
947ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
948 struct nfs_page *req)
949{
d600ad1f 950 if (!pgio->pg_lseg) {
d67ae825
TH		 951 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
952 req->wb_context,
953 0,
954 NFS4_MAX_UINT64,
955 IOMODE_RW,
c7d73af2 956 false,
d67ae825 957 GFP_NOFS);
d600ad1f
PT		 958 if (IS_ERR(pgio->pg_lseg)) {
959 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
960 pgio->pg_lseg = NULL;
961 goto out;
962 }
963 }
d67ae825
TH		 964 if (pgio->pg_lseg)
965 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
966
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
973static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
974 .pg_init = ff_layout_pg_init_read,
975 .pg_test = pnfs_generic_pg_test,
976 .pg_doio = pnfs_generic_pg_readpages,
977 .pg_cleanup = pnfs_generic_pg_cleanup,
978};
979
980static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
981 .pg_init = ff_layout_pg_init_write,
982 .pg_test = pnfs_generic_pg_test,
983 .pg_doio = pnfs_generic_pg_writepages,
984 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
985 .pg_cleanup = pnfs_generic_pg_cleanup,
986};
987
988static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
989{
990 struct rpc_task *task = &hdr->task;
991
992 pnfs_layoutcommit_inode(hdr->inode, false);
993
994 if (retry_pnfs) {
995 dprintk("%s Reset task %5u for i/o through pNFS "
996 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
997 hdr->task.tk_pid,
998 hdr->inode->i_sb->s_id,
999 (unsigned long long)NFS_FILEID(hdr->inode),
1000 hdr->args.count,
1001 (unsigned long long)hdr->args.offset);
1002
dc602dd7 1003 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1004 return;
1005 }
1006
1007 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1008 dprintk("%s Reset task %5u for i/o through MDS "
1009 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1010 hdr->task.tk_pid,
1011 hdr->inode->i_sb->s_id,
1012 (unsigned long long)NFS_FILEID(hdr->inode),
1013 hdr->args.count,
1014 (unsigned long long)hdr->args.offset);
1015
1016 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1017 }
1018}
1019
1020static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1021{
1022 struct rpc_task *task = &hdr->task;
1023
1024 pnfs_layoutcommit_inode(hdr->inode, false);
1025
1026 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1027 dprintk("%s Reset task %5u for i/o through MDS "
1028 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1029 hdr->task.tk_pid,
1030 hdr->inode->i_sb->s_id,
1031 (unsigned long long)NFS_FILEID(hdr->inode),
1032 hdr->args.count,
1033 (unsigned long long)hdr->args.offset);
1034
1035 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1036 }
1037}
1038
1039static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1040 struct nfs4_state *state,
1041 struct nfs_client *clp,
1042 struct pnfs_layout_segment *lseg,
1043 int idx)
1044{
1045 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1046 struct inode *inode = lo->plh_inode;
d67ae825 1047 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
d67ae825
TH		 1048 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1049
d67ae825 1050 switch (task->tk_status) {
d67ae825
TH		 1051 case -NFS4ERR_BADSESSION:
1052 case -NFS4ERR_BADSLOT:
1053 case -NFS4ERR_BAD_HIGH_SLOT:
1054 case -NFS4ERR_DEADSESSION:
1055 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1056 case -NFS4ERR_SEQ_FALSE_RETRY:
1057 case -NFS4ERR_SEQ_MISORDERED:
1058 dprintk("%s ERROR %d, Reset session. Exchangeid "
1059 "flags 0x%x\n", __func__, task->tk_status,
1060 clp->cl_exchange_flags);
1061 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1062 break;
1063 case -NFS4ERR_DELAY:
1064 case -NFS4ERR_GRACE:
1065 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1066 break;
1067 case -NFS4ERR_RETRY_UNCACHED_REP:
1068 break;
1069 /* Invalidate Layout errors */
1070 case -NFS4ERR_PNFS_NO_LAYOUT:
1071 case -ESTALE: /* mapped NFS4ERR_STALE */
1072 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1073 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1074 case -NFS4ERR_FHEXPIRED:
1075 case -NFS4ERR_WRONG_TYPE:
1076 dprintk("%s Invalid layout error %d\n", __func__,
1077 task->tk_status);
1078 /*
1079 * Destroy layout so new i/o will get a new layout.
1080 * Layout will not be destroyed until all current lseg
1081 * references are put. Mark layout as invalid to resend failed
1082 * i/o and all i/o waiting on the slot table to the MDS until
1083 * layout is destroyed and a new valid layout is obtained.
1084 */
1085 pnfs_destroy_layout(NFS_I(inode));
1086 rpc_wake_up(&tbl->slot_tbl_waitq);
1087 goto reset;
1088 /* RPC connection errors */
1089 case -ECONNREFUSED:
1090 case -EHOSTDOWN:
1091 case -EHOSTUNREACH:
1092 case -ENETUNREACH:
1093 case -EIO:
1094 case -ETIMEDOUT:
1095 case -EPIPE:
1096 dprintk("%s DS connection error %d\n", __func__,
1097 task->tk_status);
1c48cee8
WAA		 1098 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1099 &devid->deviceid);
d67ae825
TH		 1100 rpc_wake_up(&tbl->slot_tbl_waitq);
1101 /* fall through */
1102 default:
3b13b4b3 1103 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1104 return -NFS4ERR_RESET_TO_PNFS;
1105reset:
1106 dprintk("%s Retry through MDS. Error %d\n", __func__,
1107 task->tk_status);
1108 return -NFS4ERR_RESET_TO_MDS;
1109 }
d67ae825
TH		 1110 task->tk_status = 0;
1111 return -EAGAIN;
d67ae825
TH		 1112}
1113
1114/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1115static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1116 struct pnfs_layout_segment *lseg,
1117 int idx)
1118{
1119 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1120
90816d1d
TM		 1121 switch (task->tk_status) {
1122 /* File access problems. Don't mark the device as unavailable */
1123 case -EACCES:
1124 case -ESTALE:
1125 case -EISDIR:
1126 case -EBADHANDLE:
1127 case -ELOOP:
1128 case -ENOSPC:
1129 break;
1130 case -EJUKEBOX:
1131 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1132 goto out_retry;
1133 default:
d67ae825
TH		 1134 dprintk("%s DS connection error %d\n", __func__,
1135 task->tk_status);
1c48cee8
WAA		 1136 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1137 &devid->deviceid);
d67ae825 1138 }
90816d1d
TM		 1139 /* FIXME: Need to prevent infinite looping here. */
1140 return -NFS4ERR_RESET_TO_PNFS;
1141out_retry:
d67ae825 1142 task->tk_status = 0;
7eeea167 1143 rpc_restart_call_prepare(task);
d67ae825
TH		 1144 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1145 return -EAGAIN;
1146}
1147
1148static int ff_layout_async_handle_error(struct rpc_task *task,
1149 struct nfs4_state *state,
1150 struct nfs_client *clp,
1151 struct pnfs_layout_segment *lseg,
1152 int idx)
1153{
1154 int vers = clp->cl_nfs_mod->rpc_vers->number;
1155
df3ab232
TM		 1156 if (task->tk_status >= 0)
1157 return 0;
1158
1159 /* Handle the case of an invalid layout segment */
1160 if (!pnfs_is_valid_lseg(lseg))
1161 return -NFS4ERR_RESET_TO_PNFS;
1162
d67ae825
TH		 1163 switch (vers) {
1164 case 3:
1165 return ff_layout_async_handle_error_v3(task, lseg, idx);
1166 case 4:
1167 return ff_layout_async_handle_error_v4(task, state, clp,
1168 lseg, idx);
1169 default:
1170 /* should never happen */
1171 WARN_ON_ONCE(1);
1172 return 0;
1173 }
1174}
1175
1176static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1177 int idx, u64 offset, u64 length,
dd52128a 1178 u32 status, int opnum, int error)
d67ae825
TH		 1179{
1180 struct nfs4_ff_layout_mirror *mirror;
1181 int err;
1182
dd52128a
TM		 1183 if (status == 0) {
1184 switch (error) {
1185 case -ETIMEDOUT:
1186 case -EPFNOSUPPORT:
1187 case -EPROTONOSUPPORT:
1188 case -EOPNOTSUPP:
1189 case -ECONNREFUSED:
1190 case -ECONNRESET:
1191 case -EHOSTDOWN:
1192 case -EHOSTUNREACH:
1193 case -ENETUNREACH:
1194 case -EADDRINUSE:
1195 case -ENOBUFS:
1196 case -EPIPE:
1197 case -EPERM:
1198 status = NFS4ERR_NXIO;
1199 break;
1200 case -EACCES:
1201 status = NFS4ERR_ACCESS;
1202 break;
1203 default:
1204 return;
1205 }
1206 }
1207
c22eeb86
PT		 1208 switch (status) {
1209 case NFS4ERR_DELAY:
1210 case NFS4ERR_GRACE:
1211 return;
1212 default:
1213 break;
1214 }
1215
d67ae825
TH		 1216 mirror = FF_LAYOUT_COMP(lseg, idx);
1217 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1218 mirror, offset, length, status, opnum,
1219 GFP_NOIO);
f95c03b2 1220 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
d67ae825
TH		 1221 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1222}
1223
1224/* NFS_PROTO call done callback routines */
d67ae825
TH		 1225static int ff_layout_read_done_cb(struct rpc_task *task,
1226 struct nfs_pgio_header *hdr)
1227{
d67ae825
TH		 1228 int err;
1229
1230 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1231 if (task->tk_status < 0)
d67ae825
TH		 1232 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1233 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1234 hdr->res.op_status, OP_READ,
1235 task->tk_status);
d67ae825
TH		 1236 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1237 hdr->ds_clp, hdr->lseg,
1238 hdr->pgio_mirror_idx);
1239
42f86b44
TM		 1240 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1241 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1242 switch (err) {
1243 case -NFS4ERR_RESET_TO_PNFS:
13544412
TM		 1244 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1245 hdr->pgio_mirror_idx + 1,
1246 &hdr->pgio_mirror_idx))
1247 goto out_eagain;
42f86b44 1248 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
d67ae825
TH		 1249 return task->tk_status;
1250 case -NFS4ERR_RESET_TO_MDS:
42f86b44 1251 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1252 return task->tk_status;
1253 case -EAGAIN:
13544412 1254 goto out_eagain;
d67ae825
TH		 1255 }
1256
1257 return 0;
13544412
TM		 1258out_eagain:
1259 rpc_restart_call_prepare(task);
1260 return -EAGAIN;
d67ae825
TH		 1261}
1262
c0f5f505
TM		 1263static bool
1264ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1265{
1266 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1267}
1268
d67ae825
TH		 1269/*
1270 * We reference the rpc_cred of the first WRITE that triggers the need for
1271 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1272 * rfc5661 is not clear about which credential should be used.
1273 *
1274 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1275 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1276 * we always send layoutcommit after DS writes.
1277 */
1278static void
bc28e1c2
TM		 1279ff_layout_set_layoutcommit(struct inode *inode,
1280 struct pnfs_layout_segment *lseg,
1281 loff_t end_offset)
d67ae825 1282{
bc28e1c2 1283 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1284 return;
1285
bc28e1c2
TM		 1286 pnfs_set_layoutcommit(inode, lseg, end_offset);
1287 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1288 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1289}
1290
1291static bool
75bf47eb 1292ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
d67ae825
TH		 1293{
1294 /* No mirroring for now */
1295 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1296
1297 return ff_layout_test_devid_unavailable(node);
1298}
1299
37e9ed22
TM		 1300static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1301 struct nfs_pgio_header *hdr)
d67ae825 1302{
37e9ed22
TM		 1303 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1304 return;
0b7baf94 1305 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1306 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1307 hdr->args.count,
1308 task->tk_start);
37e9ed22
TM		 1309}
1310
1311static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1312 struct nfs_pgio_header *hdr)
1313{
1314 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1315 return;
1316 nfs4_ff_layout_stat_io_end_read(task,
1317 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1318 hdr->args.count,
1319 hdr->res.count);
056f9ad6 1320 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1321}
abcb7bfc 1322
37e9ed22
TM		 1323static int ff_layout_read_prepare_common(struct rpc_task *task,
1324 struct nfs_pgio_header *hdr)
1325{
d67ae825
TH		 1326 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1327 rpc_exit(task, -EIO);
1328 return -EIO;
1329 }
75bf47eb
TM		 1330 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1331 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1332 return -EAGAIN;
1333 }
d67ae825 1334
37e9ed22 1335 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1336 return 0;
1337}
1338
1339/*
1340 * Call ops for the async read/write cases
1341 * In the case of dense layouts, the offset needs to be reset to its
1342 * original value.
1343 */
1344static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1345{
1346 struct nfs_pgio_header *hdr = data;
1347
1348 if (ff_layout_read_prepare_common(task, hdr))
1349 return;
1350
1351 rpc_call_start(task);
1352}
1353
d67ae825
TH		 1354static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1355{
1356 struct nfs_pgio_header *hdr = data;
1357
6de7e12f
AS		 1358 if (nfs4_setup_sequence(hdr->ds_clp,
1359 &hdr->args.seq_args,
1360 &hdr->res.seq_res,
1361 task))
d67ae825
TH		 1362 return;
1363
bb21ce0a 1364 ff_layout_read_prepare_common(task, hdr);
d67ae825
TH		 1365}
1366
1367static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1368{
1369 struct nfs_pgio_header *hdr = data;
1370
1371 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1372
1373 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1374 task->tk_status == 0) {
1375 nfs4_sequence_done(task, &hdr->res.seq_res);
1376 return;
1377 }
1378
1379 /* Note this may cause RPC to be resent */
1380 hdr->mds_ops->rpc_call_done(task, hdr);
1381}
1382
1383static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1384{
1385 struct nfs_pgio_header *hdr = data;
1386
37e9ed22 1387 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1388 rpc_count_iostats_metrics(task,
1389 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1390}
1391
4d0ac221
TM		 1392static void ff_layout_read_release(void *data)
1393{
1394 struct nfs_pgio_header *hdr = data;
1395
1396 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
42f86b44
TM		 1397 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1398 pnfs_read_resend_pnfs(hdr);
1399 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1400 ff_layout_reset_read(hdr);
4d0ac221
TM		 1401 pnfs_generic_rw_release(data);
1402}
1403
1404
d67ae825
TH		 1405static int ff_layout_write_done_cb(struct rpc_task *task,
1406 struct nfs_pgio_header *hdr)
1407{
2e18d4d8 1408 loff_t end_offs = 0;
d67ae825
TH		 1409 int err;
1410
1411 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1412 if (task->tk_status < 0)
d67ae825
TH		 1413 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1414 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1415 hdr->res.op_status, OP_WRITE,
1416 task->tk_status);
d67ae825
TH		 1417 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1418 hdr->ds_clp, hdr->lseg,
1419 hdr->pgio_mirror_idx);
1420
7b0df92a
TM		 1421 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1422 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1423 switch (err) {
1424 case -NFS4ERR_RESET_TO_PNFS:
7b0df92a 1425 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
7cc8c5cd 1426 return task->tk_status;
d67ae825 1427 case -NFS4ERR_RESET_TO_MDS:
7b0df92a 1428 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1429 return task->tk_status;
1430 case -EAGAIN:
d67ae825
TH		 1431 return -EAGAIN;
1432 }
1433
1434 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1435 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1436 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1437
1438 /* Note: if the write is unstable, don't set end_offs until commit */
1439 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1440
54204010
PT		 1441 /* zero out fattr since we don't care DS attr at all */
1442 hdr->fattr.valid = 0;
69f230d9
PT		 1443 if (task->tk_status >= 0)
1444 nfs_writeback_update_inode(hdr);
1445
d67ae825
TH		 1446 return 0;
1447}
1448
1449static int ff_layout_commit_done_cb(struct rpc_task *task,
1450 struct nfs_commit_data *data)
1451{
d67ae825
TH		 1452 int err;
1453
1454 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
dd52128a 1455 if (task->tk_status < 0)
d67ae825
TH		 1456 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1457 data->args.offset, data->args.count,
dd52128a
TM		 1458 data->res.op_status, OP_COMMIT,
1459 task->tk_status);
d67ae825
TH		 1460 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1461 data->lseg, data->ds_commit_index);
1462
1463 switch (err) {
1464 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1465 pnfs_generic_prepare_to_resend_writes(data);
1466 return -EAGAIN;
d67ae825 1467 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1468 pnfs_generic_prepare_to_resend_writes(data);
1469 return -EAGAIN;
1470 case -EAGAIN:
1471 rpc_restart_call_prepare(task);
1472 return -EAGAIN;
1473 }
1474
bc28e1c2 1475 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1476
1477 return 0;
1478}
1479
37e9ed22
TM		 1480static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1481 struct nfs_pgio_header *hdr)
d67ae825 1482{
37e9ed22
TM		 1483 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1484 return;
0b7baf94 1485 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1486 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1487 hdr->args.count,
1488 task->tk_start);
37e9ed22
TM		 1489}
1490
1491static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1492 struct nfs_pgio_header *hdr)
1493{
1494 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1495 return;
1496 nfs4_ff_layout_stat_io_end_write(task,
1497 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1498 hdr->args.count, hdr->res.count,
1499 hdr->res.verf->committed);
056f9ad6 1500 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1501}
abcb7bfc 1502
37e9ed22
TM		 1503static int ff_layout_write_prepare_common(struct rpc_task *task,
1504 struct nfs_pgio_header *hdr)
1505{
d67ae825
TH		 1506 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1507 rpc_exit(task, -EIO);
1508 return -EIO;
1509 }
1510
75bf47eb
TM		 1511 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1512 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1513 return -EAGAIN;
1514 }
1515
37e9ed22 1516 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1517 return 0;
1518}
1519
1520static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1521{
1522 struct nfs_pgio_header *hdr = data;
1523
1524 if (ff_layout_write_prepare_common(task, hdr))
1525 return;
1526
1527 rpc_call_start(task);
1528}
1529
1530static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1531{
1532 struct nfs_pgio_header *hdr = data;
1533
6de7e12f
AS		 1534 if (nfs4_setup_sequence(hdr->ds_clp,
1535 &hdr->args.seq_args,
1536 &hdr->res.seq_res,
1537 task))
d67ae825
TH		 1538 return;
1539
bb21ce0a 1540 ff_layout_write_prepare_common(task, hdr);
d67ae825
TH		 1541}
1542
1543static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1544{
1545 struct nfs_pgio_header *hdr = data;
1546
1547 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1548 task->tk_status == 0) {
1549 nfs4_sequence_done(task, &hdr->res.seq_res);
1550 return;
1551 }
1552
1553 /* Note this may cause RPC to be resent */
1554 hdr->mds_ops->rpc_call_done(task, hdr);
1555}
1556
1557static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1558{
1559 struct nfs_pgio_header *hdr = data;
1560
37e9ed22 1561 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1562 rpc_count_iostats_metrics(task,
1563 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1564}
1565
4d0ac221
TM		 1566static void ff_layout_write_release(void *data)
1567{
1568 struct nfs_pgio_header *hdr = data;
1569
1570 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
7b0df92a
TM		 1571 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1572 ff_layout_reset_write(hdr, true);
1573 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1574 ff_layout_reset_write(hdr, false);
4d0ac221
TM		 1575 pnfs_generic_rw_release(data);
1576}
1577
37e9ed22 1578static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1579 struct nfs_commit_data *cdata)
1580{
37e9ed22
TM		 1581 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1582 return;
0b7baf94 1583 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1584 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1585 0, task->tk_start);
abcb7bfc
TM		 1586}
1587
37e9ed22
TM		 1588static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1589 struct nfs_commit_data *cdata)
1590{
1591 struct nfs_page *req;
1592 __u64 count = 0;
1593
1594 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1595 return;
1596
1597 if (task->tk_status == 0) {
1598 list_for_each_entry(req, &cdata->pages, wb_list)
1599 count += req->wb_bytes;
1600 }
1601 nfs4_ff_layout_stat_io_end_write(task,
1602 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1603 count, count, NFS_FILE_SYNC);
056f9ad6 1604 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
37e9ed22
TM		 1605}
1606
1607static void ff_layout_commit_prepare_common(struct rpc_task *task,
1608 struct nfs_commit_data *cdata)
1609{
1610 ff_layout_commit_record_layoutstats_start(task, cdata);
1611}
1612
d67ae825
TH		 1613static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1614{
abcb7bfc 1615 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1616 rpc_call_start(task);
1617}
1618
1619static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1620{
1621 struct nfs_commit_data *wdata = data;
1622
6de7e12f
AS		 1623 if (nfs4_setup_sequence(wdata->ds_clp,
1624 &wdata->args.seq_args,
1625 &wdata->res.seq_res,
1626 task))
abcb7bfc
TM		 1627 return;
1628 ff_layout_commit_prepare_common(task, data);
1629}
1630
1631static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1632{
1633 pnfs_generic_write_commit_done(task, data);
1634}
1635
1636static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1637{
1638 struct nfs_commit_data *cdata = data;
abcb7bfc 1639
37e9ed22 1640 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1641 rpc_count_iostats_metrics(task,
1642 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1643}
1644
4d0ac221
TM		 1645static void ff_layout_commit_release(void *data)
1646{
1647 struct nfs_commit_data *cdata = data;
1648
1649 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1650 pnfs_generic_commit_release(data);
1651}
1652
d67ae825
TH		 1653static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1654 .rpc_call_prepare = ff_layout_read_prepare_v3,
1655 .rpc_call_done = ff_layout_read_call_done,
1656 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1657 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1658};
1659
1660static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1661 .rpc_call_prepare = ff_layout_read_prepare_v4,
1662 .rpc_call_done = ff_layout_read_call_done,
1663 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1664 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1665};
1666
1667static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1668 .rpc_call_prepare = ff_layout_write_prepare_v3,
1669 .rpc_call_done = ff_layout_write_call_done,
1670 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1671 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1672};
1673
1674static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1675 .rpc_call_prepare = ff_layout_write_prepare_v4,
1676 .rpc_call_done = ff_layout_write_call_done,
1677 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1678 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1679};
1680
1681static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1682 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1683 .rpc_call_done = ff_layout_commit_done,
d67ae825 1684 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1685 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1686};
1687
1688static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1689 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1690 .rpc_call_done = ff_layout_commit_done,
d67ae825 1691 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1692 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1693};
1694
1695static enum pnfs_try_status
1696ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1697{
1698 struct pnfs_layout_segment *lseg = hdr->lseg;
1699 struct nfs4_pnfs_ds *ds;
1700 struct rpc_clnt *ds_clnt;
1701 struct rpc_cred *ds_cred;
1702 loff_t offset = hdr->args.offset;
1703 u32 idx = hdr->pgio_mirror_idx;
1704 int vers;
1705 struct nfs_fh *fh;
1706
5b5e0928 1707 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
d67ae825
TH		 1708 __func__, hdr->inode->i_ino,
1709 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1710
1711 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1712 if (!ds)
1713 goto out_failed;
1714
1715 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1716 hdr->inode);
1717 if (IS_ERR(ds_clnt))
1718 goto out_failed;
1719
1720 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1721 if (!ds_cred)
d67ae825
TH		 1722 goto out_failed;
1723
1724 vers = nfs4_ff_layout_ds_version(lseg, idx);
1725
1726 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
212bf41d 1727 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
d67ae825 1728
75bf47eb 1729 hdr->pgio_done_cb = ff_layout_read_done_cb;
212bf41d 1730 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1731 hdr->ds_clp = ds->ds_clp;
1732 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1733 if (fh)
1734 hdr->args.fh = fh;
bb21ce0a 1735
320f35b7
TM		 1736 if (vers == 4 &&
1737 !nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
bb21ce0a
TM		 1738 goto out_failed;
1739
d67ae825
TH		 1740 /*
1741 * Note that if we ever decide to split across DSes,
1742 * then we may need to handle dense-like offsets.
1743 */
1744 hdr->args.offset = offset;
1745 hdr->mds_offset = offset;
1746
1747 /* Perform an asynchronous read to ds */
1748 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1749 vers == 3 ? &ff_layout_read_call_ops_v3 :
1750 &ff_layout_read_call_ops_v4,
1751 0, RPC_TASK_SOFTCONN);
57f3f4c0 1752 put_rpccred(ds_cred);
d67ae825
TH		 1753 return PNFS_ATTEMPTED;
1754
1755out_failed:
3b13b4b3 1756 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1757 return PNFS_TRY_AGAIN;
1758 return PNFS_NOT_ATTEMPTED;
1759}
1760
1761/* Perform async writes. */
1762static enum pnfs_try_status
1763ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1764{
1765 struct pnfs_layout_segment *lseg = hdr->lseg;
1766 struct nfs4_pnfs_ds *ds;
1767 struct rpc_clnt *ds_clnt;
1768 struct rpc_cred *ds_cred;
1769 loff_t offset = hdr->args.offset;
1770 int vers;
1771 struct nfs_fh *fh;
1772 int idx = hdr->pgio_mirror_idx;
1773
1774 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1775 if (!ds)
37f8aa16 1776 goto out_failed;
d67ae825
TH		 1777
1778 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1779 hdr->inode);
1780 if (IS_ERR(ds_clnt))
37f8aa16 1781 goto out_failed;
d67ae825
TH		 1782
1783 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1784 if (!ds_cred)
37f8aa16 1785 goto out_failed;
d67ae825
TH		 1786
1787 vers = nfs4_ff_layout_ds_version(lseg, idx);
1788
5b5e0928 1789 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
d67ae825 1790 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
212bf41d 1791 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1792 vers);
1793
1794 hdr->pgio_done_cb = ff_layout_write_done_cb;
212bf41d 1795 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1796 hdr->ds_clp = ds->ds_clp;
1797 hdr->ds_commit_idx = idx;
1798 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1799 if (fh)
1800 hdr->args.fh = fh;
1801
320f35b7
TM		 1802 if (vers == 4 &&
1803 !nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
bb21ce0a
TM		 1804 goto out_failed;
1805
d67ae825
TH		 1806 /*
1807 * Note that if we ever decide to split across DSes,
1808 * then we may need to handle dense-like offsets.
1809 */
1810 hdr->args.offset = offset;
1811
1812 /* Perform an asynchronous write */
1813 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1814 vers == 3 ? &ff_layout_write_call_ops_v3 :
1815 &ff_layout_write_call_ops_v4,
1816 sync, RPC_TASK_SOFTCONN);
57f3f4c0 1817 put_rpccred(ds_cred);
d67ae825 1818 return PNFS_ATTEMPTED;
37f8aa16
TM		 1819
1820out_failed:
1821 if (ff_layout_avoid_mds_available_ds(lseg))
1822 return PNFS_TRY_AGAIN;
1823 return PNFS_NOT_ATTEMPTED;
d67ae825
TH		 1824}
1825
d67ae825
TH		 1826static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1827{
1828 return i;
1829}
1830
1831static struct nfs_fh *
1832select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1833{
1834 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1835
1836 /* FIXME: Assume that there is only one NFS version available
1837 * for the DS.
1838 */
1839 return &flseg->mirror_array[i]->fh_versions[0];
1840}
1841
1842static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1843{
1844 struct pnfs_layout_segment *lseg = data->lseg;
1845 struct nfs4_pnfs_ds *ds;
1846 struct rpc_clnt *ds_clnt;
1847 struct rpc_cred *ds_cred;
1848 u32 idx;
57f3f4c0 1849 int vers, ret;
d67ae825
TH		 1850 struct nfs_fh *fh;
1851
4b75053e
TM		 1852 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1853 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1854 goto out_err;
1855
d67ae825
TH		 1856 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1857 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1858 if (!ds)
1859 goto out_err;
1860
1861 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1862 data->inode);
1863 if (IS_ERR(ds_clnt))
1864 goto out_err;
1865
1866 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
57f3f4c0 1867 if (!ds_cred)
d67ae825
TH		 1868 goto out_err;
1869
1870 vers = nfs4_ff_layout_ds_version(lseg, idx);
1871
1872 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
212bf41d 1873 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1874 vers);
1875 data->commit_done_cb = ff_layout_commit_done_cb;
1876 data->cred = ds_cred;
212bf41d 1877 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1878 data->ds_clp = ds->ds_clp;
1879 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1880 if (fh)
1881 data->args.fh = fh;
abcb7bfc 1882
57f3f4c0 1883 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1884 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1885 &ff_layout_commit_call_ops_v4,
1886 how, RPC_TASK_SOFTCONN);
57f3f4c0
JL		 1887 put_rpccred(ds_cred);
1888 return ret;
d67ae825
TH		 1889out_err:
1890 pnfs_generic_prepare_to_resend_writes(data);
1891 pnfs_generic_commit_release(data);
1892 return -EAGAIN;
1893}
1894
1895static int
1896ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1897 int how, struct nfs_commit_info *cinfo)
1898{
1899 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1900 ff_layout_initiate_commit);
1901}
1902
1903static struct pnfs_ds_commit_info *
1904ff_layout_get_ds_info(struct inode *inode)
1905{
1906 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1907
1908 if (layout == NULL)
1909 return NULL;
1910
1911 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1912}
1913
1914static void
fc87701b 1915ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1916{
1917 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1918 id_node));
1919}
1920
5ba6a09e 1921static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
5b9b3c85
TM		 1922 const struct nfs4_layoutreturn_args *args,
1923 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1924{
d67ae825 1925 __be32 *start;
d67ae825
TH		 1926
1927 start = xdr_reserve_space(xdr, 4);
1928 if (unlikely(!start))
1929 return -E2BIG;
1930
5b9b3c85 1931 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 1932 /* This assume we always return _ALL_ layouts */
5b9b3c85 1933 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 1934}
1935
230bc962
TM		 1936static void
1937encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1938{
ab6e9aaf 1939 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
230bc962
TM		 1940}
1941
1942static void
1943ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
1944 const nfs4_stateid *stateid,
1945 const struct nfs42_layoutstat_devinfo *devinfo)
1946{
1947 __be32 *p;
1948
1949 p = xdr_reserve_space(xdr, 8 + 8);
1950 p = xdr_encode_hyper(p, devinfo->offset);
1951 p = xdr_encode_hyper(p, devinfo->length);
1952 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
1953 p = xdr_reserve_space(xdr, 4*8);
1954 p = xdr_encode_hyper(p, devinfo->read_count);
1955 p = xdr_encode_hyper(p, devinfo->read_bytes);
1956 p = xdr_encode_hyper(p, devinfo->write_count);
1957 p = xdr_encode_hyper(p, devinfo->write_bytes);
1958 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
1959}
1960
1961static void
1962ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
1963 const nfs4_stateid *stateid,
1964 const struct nfs42_layoutstat_devinfo *devinfo)
1965{
1966 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
1967 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
1968 devinfo->ld_private.data);
1969}
1970
d67ae825 1971/* report nothing for now */
230bc962
TM		 1972static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
1973 const struct nfs4_layoutreturn_args *args,
1974 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 1975{
1976 __be32 *p;
230bc962 1977 int i;
d67ae825
TH		 1978
1979 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 1980 *p = cpu_to_be32(ff_args->num_dev);
1981 for (i = 0; i < ff_args->num_dev; i++)
1982 ff_layout_encode_ff_iostat(xdr,
1983 &args->layout->plh_stateid,
1984 &ff_args->devinfo[i]);
1985}
1986
1987static void
1988ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
1989 unsigned int num_entries)
1990{
1991 unsigned int i;
1992
1993 for (i = 0; i < num_entries; i++) {
1994 if (!devinfo[i].ld_private.ops)
1995 continue;
1996 if (!devinfo[i].ld_private.ops->free)
1997 continue;
1998 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
1999 }
d67ae825
TH		 2000}
2001
2002static struct nfs4_deviceid_node *
2003ff_layout_alloc_deviceid_node(struct nfs_server *server,
2004 struct pnfs_device *pdev, gfp_t gfp_flags)
2005{
2006 struct nfs4_ff_layout_ds *dsaddr;
2007
2008 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2009 if (!dsaddr)
2010 return NULL;
2011 return &dsaddr->id_node;
2012}
2013
2014static void
94e5c571 2015ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2016 const void *voidargs,
2017 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2018{
5b9b3c85 2019 const struct nfs4_layoutreturn_args *args = voidargs;
5ba6a09e 2020 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
d9152114
TM		 2021 struct xdr_buf tmp_buf = {
2022 .head = {
2023 [0] = {
2024 .iov_base = page_address(ff_args->pages[0]),
2025 },
2026 },
2027 .buflen = PAGE_SIZE,
2028 };
2029 struct xdr_stream tmp_xdr;
d67ae825
TH		 2030 __be32 *start;
2031
2032 dprintk("%s: Begin\n", __func__);
d67ae825 2033
d9152114
TM		 2034 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL);
2035
2036 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2037 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2038
2039 start = xdr_reserve_space(xdr, 4);
2040 *start = cpu_to_be32(tmp_buf.len);
2041 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
082fa37d 2042
d67ae825
TH		 2043 dprintk("%s: Return\n", __func__);
2044}
2045
5b9b3c85
TM		 2046static void
2047ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2048{
2049 struct nfs4_flexfile_layoutreturn_args *ff_args;
2050
2051 if (!args->data)
2052 return;
2053 ff_args = args->data;
2054 args->data = NULL;
2055
2056 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2057 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85 2058
d9152114 2059 put_page(ff_args->pages[0]);
5b9b3c85
TM		 2060 kfree(ff_args);
2061}
2062
2e54b9b1 2063static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
5b9b3c85
TM		 2064 .encode = ff_layout_encode_layoutreturn,
2065 .free = ff_layout_free_layoutreturn,
2066};
2067
2068static int
2069ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2070{
2071 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2072 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85
TM		 2073
2074 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2075 if (!ff_args)
d9152114
TM		 2076 goto out_nomem;
2077 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2078 if (!ff_args->pages[0])
2079 goto out_nomem_free;
5b9b3c85
TM		 2080
2081 INIT_LIST_HEAD(&ff_args->errors);
2082 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2083 &args->range, &ff_args->errors,
2084 FF_LAYOUTRETURN_MAXERR);
2085
230bc962
TM		 2086 spin_lock(&args->inode->i_lock);
2087 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2088 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2089 spin_unlock(&args->inode->i_lock);
2090
5b9b3c85
TM		 2091 args->ld_private->ops = &layoutreturn_ops;
2092 args->ld_private->data = ff_args;
2093 return 0;
d9152114
TM		 2094out_nomem_free:
2095 kfree(ff_args);
2096out_nomem:
2097 return -ENOMEM;
5b9b3c85
TM		 2098}
2099
27c43064
PT		 2100static int
2101ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2102{
2103 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2104
2105 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2106}
2107
2108static size_t
2109ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2110 const int buflen)
2111{
2112 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2113 const struct in6_addr *addr = &sin6->sin6_addr;
2114
2115 /*
2116 * RFC 4291, Section 2.2.2
2117 *
2118 * Shorthanded ANY address
2119 */
2120 if (ipv6_addr_any(addr))
2121 return snprintf(buf, buflen, "::");
2122
2123 /*
2124 * RFC 4291, Section 2.2.2
2125 *
2126 * Shorthanded loopback address
2127 */
2128 if (ipv6_addr_loopback(addr))
2129 return snprintf(buf, buflen, "::1");
2130
2131 /*
2132 * RFC 4291, Section 2.2.3
2133 *
2134 * Special presentation address format for mapped v4
2135 * addresses.
2136 */
2137 if (ipv6_addr_v4mapped(addr))
2138 return snprintf(buf, buflen, "::ffff:%pI4",
2139 &addr->s6_addr32[3]);
2140
2141 /*
2142 * RFC 4291, Section 2.2.1
2143 */
2144 return snprintf(buf, buflen, "%pI6c", addr);
2145}
2146
2147/* Derived from rpc_sockaddr2uaddr */
2148static void
2149ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2150{
2151 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2152 char portbuf[RPCBIND_MAXUADDRPLEN];
2153 char addrbuf[RPCBIND_MAXUADDRLEN];
2154 char *netid;
2155 unsigned short port;
2156 int len, netid_len;
2157 __be32 *p;
2158
2159 switch (sap->sa_family) {
2160 case AF_INET:
2161 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2162 return;
2163 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2164 netid = "tcp";
2165 netid_len = 3;
2166 break;
2167 case AF_INET6:
2168 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2169 return;
2170 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2171 netid = "tcp6";
2172 netid_len = 4;
2173 break;
2174 default:
2175 /* we only support tcp and tcp6 */
2176 WARN_ON_ONCE(1);
2177 return;
2178 }
2179
2180 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2181 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2182
2183 p = xdr_reserve_space(xdr, 4 + netid_len);
2184 xdr_encode_opaque(p, netid, netid_len);
2185
2186 p = xdr_reserve_space(xdr, 4 + len);
2187 xdr_encode_opaque(p, addrbuf, len);
2188}
2189
2190static void
2191ff_layout_encode_nfstime(struct xdr_stream *xdr,
2192 ktime_t t)
2193{
2194 struct timespec64 ts;
2195 __be32 *p;
2196
2197 p = xdr_reserve_space(xdr, 12);
2198 ts = ktime_to_timespec64(t);
2199 p = xdr_encode_hyper(p, ts.tv_sec);
2200 *p++ = cpu_to_be32(ts.tv_nsec);
2201}
2202
2203static void
2204ff_layout_encode_io_latency(struct xdr_stream *xdr,
2205 struct nfs4_ff_io_stat *stat)
2206{
2207 __be32 *p;
2208
2209 p = xdr_reserve_space(xdr, 5 * 8);
2210 p = xdr_encode_hyper(p, stat->ops_requested);
2211 p = xdr_encode_hyper(p, stat->bytes_requested);
2212 p = xdr_encode_hyper(p, stat->ops_completed);
2213 p = xdr_encode_hyper(p, stat->bytes_completed);
2214 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2215 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2216 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2217}
2218
2219static void
422c93c8
TM		 2220ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2221 const struct nfs42_layoutstat_devinfo *devinfo,
2222 struct nfs4_ff_layout_mirror *mirror)
27c43064 2223{
27c43064
PT		 2224 struct nfs4_pnfs_ds_addr *da;
2225 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2226 struct nfs_fh *fh = &mirror->fh_versions[0];
422c93c8 2227 __be32 *p;
27c43064
PT		 2228
2229 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2230 dprintk("%s: DS %s: encoding address %s\n",
2231 __func__, ds->ds_remotestr, da->da_remotestr);
27c43064
PT		 2232 /* netaddr4 */
2233 ff_layout_encode_netaddr(xdr, da);
2234 /* nfs_fh4 */
2235 p = xdr_reserve_space(xdr, 4 + fh->size);
2236 xdr_encode_opaque(p, fh->data, fh->size);
2237 /* ff_io_latency4 read */
2238 spin_lock(&mirror->lock);
2239 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2240 /* ff_io_latency4 write */
2241 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2242 spin_unlock(&mirror->lock);
2243 /* nfstime4 */
2244 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2245 /* bool */
2246 p = xdr_reserve_space(xdr, 4);
2247 *p = cpu_to_be32(false);
422c93c8
TM		 2248}
2249
2250static void
2251ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2252 const struct nfs4_xdr_opaque_data *opaque)
2253{
2254 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2255 struct nfs42_layoutstat_devinfo, ld_private);
2256 __be32 *start;
2257
2258 /* layoutupdate length */
2259 start = xdr_reserve_space(xdr, 4);
2260 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
27c43064
PT		 2261
2262 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2263}
2264
422c93c8
TM		 2265static void
2266ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2267{
2268 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2269
2270 ff_layout_put_mirror(mirror);
2271}
2272
2273static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2274 .encode = ff_layout_encode_layoutstats,
2275 .free = ff_layout_free_layoutstats,
2276};
2277
266d12d4 2278static int
08e2e5bc
TM		 2279ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2280 struct nfs42_layoutstat_devinfo *devinfo,
266d12d4 2281 int dev_limit)
ad4dc53e 2282{
266d12d4 2283 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2284 struct nfs4_ff_layout_mirror *mirror;
2285 struct nfs4_deviceid_node *dev;
266d12d4 2286 int i = 0;
ad4dc53e 2287
266d12d4
TM		 2288 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2289 if (i >= dev_limit)
ad4dc53e 2290 break;
65990d1a 2291 if (IS_ERR_OR_NULL(mirror->mirror_ds))
27c43064 2292 continue;
06946c6a
TM		 2293 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2294 continue;
266d12d4 2295 /* mirror refcount put in cleanup_layoutstats */
81a090b9 2296 if (!refcount_inc_not_zero(&mirror->ref))
266d12d4
TM		 2297 continue;
2298 dev = &mirror->mirror_ds->id_node;
ad4dc53e 2299 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2300 devinfo->offset = 0;
2301 devinfo->length = NFS4_MAX_UINT64;
2f8220c1 2302 spin_lock(&mirror->lock);
d099d7b8 2303 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2304 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2305 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e 2306 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2f8220c1 2307 spin_unlock(&mirror->lock);
ad4dc53e 2308 devinfo->layout_type = LAYOUT_FLEX_FILES;
422c93c8
TM		 2309 devinfo->ld_private.ops = &layoutstat_ops;
2310 devinfo->ld_private.data = mirror;
ad4dc53e 2311
08e2e5bc 2312 devinfo++;
266d12d4 2313 i++;
ad4dc53e 2314 }
266d12d4 2315 return i;
ad4dc53e
PT		 2316}
2317
2318static int
2319ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2320{
266d12d4 2321 struct nfs4_flexfile_layout *ff_layout;
08e2e5bc 2322 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
ad4dc53e 2323
ad4dc53e 2324 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
266d12d4 2325 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2326 if (!args->devinfo)
2327 return -ENOMEM;
2328
ad4dc53e 2329 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2330 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2331 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2332 &args->devinfo[0], dev_count);
ad4dc53e 2333 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2334 if (!args->num_dev) {
2335 kfree(args->devinfo);
2336 args->devinfo = NULL;
2337 return -ENOENT;
2338 }
ad4dc53e
PT		 2339
2340 return 0;
2341}
2342
76b2a303
TM		 2343static int
2344ff_layout_set_layoutdriver(struct nfs_server *server,
2345 const struct nfs_fh *dummy)
2346{
2347#if IS_ENABLED(CONFIG_NFS_V4_2)
2348 server->caps |= NFS_CAP_LAYOUTSTATS;
2349#endif
2350 return 0;
2351}
2352
d67ae825
TH		 2353static struct pnfs_layoutdriver_type flexfilelayout_type = {
2354 .id = LAYOUT_FLEX_FILES,
2355 .name = "LAYOUT_FLEX_FILES",
2356 .owner = THIS_MODULE,
f86c3ac5 2357 .flags = PNFS_LAYOUTGET_ON_OPEN,
28ced9a8 2358 .max_layoutget_response = 4096, /* 1 page or so... */
76b2a303 2359 .set_layoutdriver = ff_layout_set_layoutdriver,
d67ae825
TH		 2360 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2361 .free_layout_hdr = ff_layout_free_layout_hdr,
2362 .alloc_lseg = ff_layout_alloc_lseg,
2363 .free_lseg = ff_layout_free_lseg,
0762ed2c 2364 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2365 .pg_read_ops = &ff_layout_pg_read_ops,
2366 .pg_write_ops = &ff_layout_pg_write_ops,
2367 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2368 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 2369 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 2370 .clear_request_commit = pnfs_generic_clear_request_commit,
2371 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2372 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2373 .commit_pagelist = ff_layout_commit_pagelist,
2374 .read_pagelist = ff_layout_read_pagelist,
2375 .write_pagelist = ff_layout_write_pagelist,
2376 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2377 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2378 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2379 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2380};
2381
2382static int __init nfs4flexfilelayout_init(void)
2383{
2384 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2385 __func__);
90a0be00
JL		 2386 if (!ff_zero_group) {
2387 ff_zero_group = groups_alloc(0);
2388 if (!ff_zero_group)
2389 return -ENOMEM;
2390 }
d67ae825
TH		 2391 return pnfs_register_layoutdriver(&flexfilelayout_type);
2392}
2393
2394static void __exit nfs4flexfilelayout_exit(void)
2395{
2396 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2397 __func__);
2398 pnfs_unregister_layoutdriver(&flexfilelayout_type);
90a0be00
JL		 2399 if (ff_zero_group) {
2400 put_group_info(ff_zero_group);
2401 ff_zero_group = NULL;
2402 }
d67ae825
TH		 2403}
2404
2405MODULE_ALIAS("nfs-layouttype4-4");
2406
2407MODULE_LICENSE("GPL");
2408MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2409
2410module_init(nfs4flexfilelayout_init);
2411module_exit(nfs4flexfilelayout_exit);
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