]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - fs/nfs/flexfilelayout/flexfilelayout.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
pNFS/flexfiles: Refactor encoding of the layoutreturn payload
[mirror_ubuntu-artful-kernel.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);
35
d67ae825
TH		 36static struct pnfs_layout_hdr *
37ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
38{
39 struct nfs4_flexfile_layout *ffl;
40
41 ffl = kzalloc(sizeof(*ffl), gfp_flags);
42 if (ffl) {
43 INIT_LIST_HEAD(&ffl->error_list);
266d12d4 44 INIT_LIST_HEAD(&ffl->mirrors);
1c8d477a 45 ffl->last_report_time = ktime_get();
d67ae825
TH		 46 return &ffl->generic_hdr;
47 } else
48 return NULL;
49}
50
51static void
52ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
53{
54 struct nfs4_ff_layout_ds_err *err, *n;
55
56 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
57 list) {
58 list_del(&err->list);
59 kfree(err);
60 }
61 kfree(FF_LAYOUT_FROM_HDR(lo));
62}
63
93b717fd 64static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
d67ae825
TH		 65{
66 __be32 *p;
67
68 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
69 if (unlikely(p == NULL))
70 return -ENOBUFS;
93b717fd
TM		 71 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
72 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
d67ae825
TH		 73 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
74 p[0], p[1], p[2], p[3]);
75 return 0;
76}
77
78static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
79{
80 __be32 *p;
81
82 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
83 if (unlikely(!p))
84 return -ENOBUFS;
85 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
86 nfs4_print_deviceid(devid);
87 return 0;
88}
89
90static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
91{
92 __be32 *p;
93
94 p = xdr_inline_decode(xdr, 4);
95 if (unlikely(!p))
96 return -ENOBUFS;
97 fh->size = be32_to_cpup(p++);
98 if (fh->size > sizeof(struct nfs_fh)) {
99 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
100 fh->size);
101 return -EOVERFLOW;
102 }
103 /* fh.data */
104 p = xdr_inline_decode(xdr, fh->size);
105 if (unlikely(!p))
106 return -ENOBUFS;
107 memcpy(&fh->data, p, fh->size);
108 dprintk("%s: fh len %d\n", __func__, fh->size);
109
110 return 0;
111}
112
113/*
114 * Currently only stringified uids and gids are accepted.
115 * I.e., kerberos is not supported to the DSes, so no pricipals.
116 *
117 * That means that one common function will suffice, but when
118 * principals are added, this should be split to accomodate
119 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
120 */
121static int
122decode_name(struct xdr_stream *xdr, u32 *id)
123{
124 __be32 *p;
125 int len;
126
127 /* opaque_length(4)*/
128 p = xdr_inline_decode(xdr, 4);
129 if (unlikely(!p))
130 return -ENOBUFS;
131 len = be32_to_cpup(p++);
132 if (len < 0)
133 return -EINVAL;
134
135 dprintk("%s: len %u\n", __func__, len);
136
137 /* opaque body */
138 p = xdr_inline_decode(xdr, len);
139 if (unlikely(!p))
140 return -ENOBUFS;
141
142 if (!nfs_map_string_to_numeric((char *)p, len, id))
143 return -EINVAL;
144
145 return 0;
146}
147
266d12d4
TM		 148static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
149 const struct nfs4_ff_layout_mirror *m2)
150{
151 int i, j;
152
153 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
154 return false;
155 for (i = 0; i < m1->fh_versions_cnt; i++) {
156 bool found_fh = false;
86fb449b 157 for (j = 0; j < m2->fh_versions_cnt; j++) {
266d12d4
TM		 158 if (nfs_compare_fh(&m1->fh_versions[i],
159 &m2->fh_versions[j]) == 0) {
160 found_fh = true;
161 break;
162 }
163 }
164 if (!found_fh)
165 return false;
166 }
167 return true;
168}
169
170static struct nfs4_ff_layout_mirror *
171ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
172 struct nfs4_ff_layout_mirror *mirror)
173{
174 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
175 struct nfs4_ff_layout_mirror *pos;
176 struct inode *inode = lo->plh_inode;
177
178 spin_lock(&inode->i_lock);
179 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
180 if (mirror->mirror_ds != pos->mirror_ds)
181 continue;
182 if (!ff_mirror_match_fh(mirror, pos))
183 continue;
184 if (atomic_inc_not_zero(&pos->ref)) {
185 spin_unlock(&inode->i_lock);
186 return pos;
187 }
188 }
189 list_add(&mirror->mirrors, &ff_layout->mirrors);
190 mirror->layout = lo;
191 spin_unlock(&inode->i_lock);
192 return mirror;
193}
194
e3b1df2d 195static void
266d12d4
TM		 196ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
197{
198 struct inode *inode;
199 if (mirror->layout == NULL)
200 return;
201 inode = mirror->layout->plh_inode;
202 spin_lock(&inode->i_lock);
203 list_del(&mirror->mirrors);
204 spin_unlock(&inode->i_lock);
205 mirror->layout = NULL;
206}
207
28a0d72c
TM		 208static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
209{
210 struct nfs4_ff_layout_mirror *mirror;
211
212 mirror = kzalloc(sizeof(*mirror), gfp_flags);
213 if (mirror != NULL) {
214 spin_lock_init(&mirror->lock);
215 atomic_set(&mirror->ref, 1);
266d12d4 216 INIT_LIST_HEAD(&mirror->mirrors);
28a0d72c
TM		 217 }
218 return mirror;
219}
220
221static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
222{
3064b686
JL		 223 struct rpc_cred *cred;
224
266d12d4 225 ff_layout_remove_mirror(mirror);
28a0d72c 226 kfree(mirror->fh_versions);
3064b686
JL		 227 cred = rcu_access_pointer(mirror->ro_cred);
228 if (cred)
229 put_rpccred(cred);
230 cred = rcu_access_pointer(mirror->rw_cred);
231 if (cred)
232 put_rpccred(cred);
28a0d72c
TM		 233 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
234 kfree(mirror);
235}
236
237static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
238{
239 if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
240 ff_layout_free_mirror(mirror);
241}
242
d67ae825
TH		 243static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
244{
245 int i;
246
247 if (fls->mirror_array) {
248 for (i = 0; i < fls->mirror_array_cnt; i++) {
249 /* normally mirror_ds is freed in
250 * .free_deviceid_node but we still do it here
251 * for .alloc_lseg error path */
28a0d72c 252 ff_layout_put_mirror(fls->mirror_array[i]);
d67ae825
TH		 253 }
254 kfree(fls->mirror_array);
255 fls->mirror_array = NULL;
256 }
257}
258
259static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
260{
261 int ret = 0;
262
263 dprintk("--> %s\n", __func__);
264
265 /* FIXME: remove this check when layout segment support is added */
266 if (lgr->range.offset != 0 ||
267 lgr->range.length != NFS4_MAX_UINT64) {
268 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
269 __func__);
270 ret = -EINVAL;
271 }
272
273 dprintk("--> %s returns %d\n", __func__, ret);
274 return ret;
275}
276
277static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
278{
279 if (fls) {
280 ff_layout_free_mirror_array(fls);
281 kfree(fls);
282 }
283}
284
0762ed2c
TM		 285static bool
286ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
287 const struct pnfs_layout_range *l2)
288{
289 u64 end1, end2;
290
291 if (l1->iomode != l2->iomode)
292 return l1->iomode != IOMODE_READ;
293 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
294 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
295 if (end1 < l2->offset)
296 return false;
297 if (end2 < l1->offset)
298 return true;
299 return l2->offset <= l1->offset;
300}
301
302static bool
303ff_lseg_merge(struct pnfs_layout_segment *new,
304 struct pnfs_layout_segment *old)
305{
306 u64 new_end, old_end;
307
ee26bdd6
JL		 308 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
309 return false;
0762ed2c
TM		 310 if (new->pls_range.iomode != old->pls_range.iomode)
311 return false;
312 old_end = pnfs_calc_offset_end(old->pls_range.offset,
313 old->pls_range.length);
314 if (old_end < new->pls_range.offset)
315 return false;
316 new_end = pnfs_calc_offset_end(new->pls_range.offset,
317 new->pls_range.length);
318 if (new_end < old->pls_range.offset)
319 return false;
320
321 /* Mergeable: copy info from 'old' to 'new' */
322 if (new_end < old_end)
323 new_end = old_end;
324 if (new->pls_range.offset < old->pls_range.offset)
325 new->pls_range.offset = old->pls_range.offset;
326 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
327 new_end);
328 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
329 set_bit(NFS_LSEG_ROC, &new->pls_flags);
0762ed2c
TM		 330 return true;
331}
332
333static void
334ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
335 struct pnfs_layout_segment *lseg,
336 struct list_head *free_me)
337{
338 pnfs_generic_layout_insert_lseg(lo, lseg,
339 ff_lseg_range_is_after,
340 ff_lseg_merge,
341 free_me);
342}
343
d67ae825
TH		 344static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
345{
d67ae825
TH		 346 int i, j;
347
348 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
349 for (j = i + 1; j < fls->mirror_array_cnt; j++)
350 if (fls->mirror_array[i]->efficiency <
455b6ee6
FF		 351 fls->mirror_array[j]->efficiency)
352 swap(fls->mirror_array[i],
353 fls->mirror_array[j]);
d67ae825
TH		 354 }
355}
356
260074cd
TM		 357static void ff_layout_mark_devices_valid(struct nfs4_ff_layout_segment *fls)
358{
359 struct nfs4_deviceid_node *node;
360 int i;
361
362 if (!(fls->flags & FF_FLAGS_NO_IO_THRU_MDS))
363 return;
364 for (i = 0; i < fls->mirror_array_cnt; i++) {
365 node = &fls->mirror_array[i]->mirror_ds->id_node;
366 clear_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags);
367 }
368}
369
d67ae825
TH		 370static struct pnfs_layout_segment *
371ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
372 struct nfs4_layoutget_res *lgr,
373 gfp_t gfp_flags)
374{
375 struct pnfs_layout_segment *ret;
376 struct nfs4_ff_layout_segment *fls = NULL;
377 struct xdr_stream stream;
378 struct xdr_buf buf;
379 struct page *scratch;
380 u64 stripe_unit;
381 u32 mirror_array_cnt;
382 __be32 *p;
383 int i, rc;
384
385 dprintk("--> %s\n", __func__);
386 scratch = alloc_page(gfp_flags);
387 if (!scratch)
388 return ERR_PTR(-ENOMEM);
389
390 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
391 lgr->layoutp->len);
392 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
393
394 /* stripe unit and mirror_array_cnt */
395 rc = -EIO;
396 p = xdr_inline_decode(&stream, 8 + 4);
397 if (!p)
398 goto out_err_free;
399
400 p = xdr_decode_hyper(p, &stripe_unit);
401 mirror_array_cnt = be32_to_cpup(p++);
402 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
403 stripe_unit, mirror_array_cnt);
404
405 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
406 mirror_array_cnt == 0)
407 goto out_err_free;
408
409 rc = -ENOMEM;
410 fls = kzalloc(sizeof(*fls), gfp_flags);
411 if (!fls)
412 goto out_err_free;
413
414 fls->mirror_array_cnt = mirror_array_cnt;
415 fls->stripe_unit = stripe_unit;
416 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
417 sizeof(fls->mirror_array[0]), gfp_flags);
418 if (fls->mirror_array == NULL)
419 goto out_err_free;
420
421 for (i = 0; i < fls->mirror_array_cnt; i++) {
266d12d4 422 struct nfs4_ff_layout_mirror *mirror;
d67ae825
TH		 423 struct nfs4_deviceid devid;
424 struct nfs4_deviceid_node *idnode;
90a0be00 425 struct auth_cred acred = { .group_info = ff_zero_group };
3064b686 426 struct rpc_cred __rcu *cred;
90a0be00 427 u32 ds_count, fh_count, id;
d67ae825
TH		 428 int j;
429
430 rc = -EIO;
431 p = xdr_inline_decode(&stream, 4);
432 if (!p)
433 goto out_err_free;
434 ds_count = be32_to_cpup(p);
435
436 /* FIXME: allow for striping? */
437 if (ds_count != 1)
438 goto out_err_free;
439
28a0d72c 440 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
d67ae825
TH		 441 if (fls->mirror_array[i] == NULL) {
442 rc = -ENOMEM;
443 goto out_err_free;
444 }
445
d67ae825
TH		 446 fls->mirror_array[i]->ds_count = ds_count;
447
448 /* deviceid */
449 rc = decode_deviceid(&stream, &devid);
450 if (rc)
451 goto out_err_free;
452
453 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
454 &devid, lh->plh_lc_cred,
455 gfp_flags);
456 /*
457 * upon success, mirror_ds is allocated by previous
458 * getdeviceinfo, or newly by .alloc_deviceid_node
459 * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
460 */
461 if (idnode)
462 fls->mirror_array[i]->mirror_ds =
463 FF_LAYOUT_MIRROR_DS(idnode);
464 else
465 goto out_err_free;
466
467 /* efficiency */
468 rc = -EIO;
469 p = xdr_inline_decode(&stream, 4);
470 if (!p)
471 goto out_err_free;
472 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
473
474 /* stateid */
93b717fd 475 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
d67ae825
TH		 476 if (rc)
477 goto out_err_free;
478
479 /* fh */
480 p = xdr_inline_decode(&stream, 4);
481 if (!p)
482 goto out_err_free;
483 fh_count = be32_to_cpup(p);
484
485 fls->mirror_array[i]->fh_versions =
486 kzalloc(fh_count * sizeof(struct nfs_fh),
487 gfp_flags);
488 if (fls->mirror_array[i]->fh_versions == NULL) {
489 rc = -ENOMEM;
490 goto out_err_free;
491 }
492
493 for (j = 0; j < fh_count; j++) {
494 rc = decode_nfs_fh(&stream,
495 &fls->mirror_array[i]->fh_versions[j]);
496 if (rc)
497 goto out_err_free;
498 }
499
500 fls->mirror_array[i]->fh_versions_cnt = fh_count;
501
502 /* user */
90a0be00 503 rc = decode_name(&stream, &id);
d67ae825
TH		 504 if (rc)
505 goto out_err_free;
506
90a0be00
JL		 507 acred.uid = make_kuid(&init_user_ns, id);
508
d67ae825 509 /* group */
90a0be00 510 rc = decode_name(&stream, &id);
d67ae825
TH		 511 if (rc)
512 goto out_err_free;
513
90a0be00
JL		 514 acred.gid = make_kgid(&init_user_ns, id);
515
516 /* find the cred for it */
3064b686 517 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
90a0be00
JL		 518 if (IS_ERR(cred)) {
519 rc = PTR_ERR(cred);
520 goto out_err_free;
521 }
522
3064b686
JL		 523 if (lgr->range.iomode == IOMODE_READ)
524 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
525 else
526 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
90a0be00 527
266d12d4
TM		 528 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
529 if (mirror != fls->mirror_array[i]) {
90a0be00 530 /* swap cred ptrs so free_mirror will clean up old */
3064b686
JL		 531 if (lgr->range.iomode == IOMODE_READ) {
532 cred = xchg(&mirror->ro_cred, cred);
533 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
534 } else {
535 cred = xchg(&mirror->rw_cred, cred);
536 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
537 }
266d12d4
TM		 538 ff_layout_free_mirror(fls->mirror_array[i]);
539 fls->mirror_array[i] = mirror;
540 }
541
3064b686
JL		 542 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
543 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
90a0be00
JL		 544 from_kuid(&init_user_ns, acred.uid),
545 from_kgid(&init_user_ns, acred.gid));
d67ae825
TH		 546 }
547
c0f5f505 548 p = xdr_inline_decode(&stream, 4);
d0379a5d
TM		 549 if (!p)
550 goto out_sort_mirrors;
551 fls->flags = be32_to_cpup(p);
552
553 p = xdr_inline_decode(&stream, 4);
554 if (!p)
555 goto out_sort_mirrors;
556 for (i=0; i < fls->mirror_array_cnt; i++)
557 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
c0f5f505 558
d0379a5d 559out_sort_mirrors:
d67ae825
TH		 560 ff_layout_sort_mirrors(fls);
561 rc = ff_layout_check_layout(lgr);
562 if (rc)
563 goto out_err_free;
260074cd 564 ff_layout_mark_devices_valid(fls);
d67ae825
TH		 565
566 ret = &fls->generic_hdr;
567 dprintk("<-- %s (success)\n", __func__);
568out_free_page:
569 __free_page(scratch);
570 return ret;
571out_err_free:
572 _ff_layout_free_lseg(fls);
573 ret = ERR_PTR(rc);
574 dprintk("<-- %s (%d)\n", __func__, rc);
575 goto out_free_page;
576}
577
578static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
579{
580 struct pnfs_layout_segment *lseg;
581
582 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
583 if (lseg->pls_range.iomode == IOMODE_RW)
584 return true;
585
586 return false;
587}
588
589static void
590ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
591{
592 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 593
594 dprintk("--> %s\n", __func__);
595
d67ae825
TH		 596 if (lseg->pls_range.iomode == IOMODE_RW) {
597 struct nfs4_flexfile_layout *ffl;
598 struct inode *inode;
599
600 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
601 inode = ffl->generic_hdr.plh_inode;
602 spin_lock(&inode->i_lock);
603 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
604 ffl->commit_info.nbuckets = 0;
605 kfree(ffl->commit_info.buckets);
606 ffl->commit_info.buckets = NULL;
607 }
608 spin_unlock(&inode->i_lock);
609 }
610 _ff_layout_free_lseg(fls);
611}
612
613/* Return 1 until we have multiple lsegs support */
614static int
615ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
616{
617 return 1;
618}
619
abcb7bfc 620static void
e76d28dd 621nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 622{
9bbd9bb4
PT		 623 /* first IO request? */
624 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 625 timer->start_time = now;
abcb7bfc
TM		 626 }
627}
628
629static ktime_t
e76d28dd 630nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 631{
e76d28dd 632 ktime_t start;
abcb7bfc 633
9bbd9bb4
PT		 634 if (atomic_dec_return(&timer->n_ops) < 0)
635 WARN_ON_ONCE(1);
636
9bbd9bb4
PT		 637 start = timer->start_time;
638 timer->start_time = now;
abcb7bfc
TM		 639 return ktime_sub(now, start);
640}
641
97ba375b 642static bool
d983803d 643nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 644 struct nfs4_ff_layoutstat *layoutstat,
645 ktime_t now)
abcb7bfc 646{
d983803d 647 static const ktime_t notime = {0};
bbf58bf3 648 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
1c8d477a 649 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
d983803d 650
e76d28dd 651 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
9bbd9bb4
PT		 652 if (ktime_equal(mirror->start_time, notime))
653 mirror->start_time = now;
d0379a5d
TM		 654 if (mirror->report_interval != 0)
655 report_interval = (s64)mirror->report_interval * 1000LL;
656 else if (layoutstats_timer != 0)
bbf58bf3 657 report_interval = (s64)layoutstats_timer * 1000LL;
1c8d477a 658 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
bbf58bf3 659 report_interval) {
1c8d477a 660 ffl->last_report_time = now;
97ba375b
PT		 661 return true;
662 }
663
664 return false;
abcb7bfc
TM		 665}
666
667static void
668nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
669 __u64 requested)
670{
671 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
672
673 iostat->ops_requested++;
674 iostat->bytes_requested += requested;
675}
676
677static void
678nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
679 __u64 requested,
680 __u64 completed,
e76d28dd
TM		 681 ktime_t time_completed,
682 ktime_t time_started)
abcb7bfc
TM		 683{
684 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 685 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 686 ktime_t timer;
687
688 iostat->ops_completed++;
689 iostat->bytes_completed += completed;
690 iostat->bytes_not_delivered += requested - completed;
691
e76d28dd 692 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 693 iostat->total_busy_time =
694 ktime_add(iostat->total_busy_time, timer);
695 iostat->aggregate_completion_time =
e76d28dd
TM		 696 ktime_add(iostat->aggregate_completion_time,
697 completion_time);
abcb7bfc
TM		 698}
699
700static void
0b7baf94
TM		 701nfs4_ff_layout_stat_io_start_read(struct inode *inode,
702 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 703 __u64 requested, ktime_t now)
abcb7bfc 704{
97ba375b
PT		 705 bool report;
706
abcb7bfc 707 spin_lock(&mirror->lock);
e76d28dd 708 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
abcb7bfc 709 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
06946c6a 710 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 711 spin_unlock(&mirror->lock);
97ba375b
PT		 712
713 if (report)
0b7baf94 714 pnfs_report_layoutstat(inode, GFP_KERNEL);
abcb7bfc
TM		 715}
716
717static void
718nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
719 struct nfs4_ff_layout_mirror *mirror,
720 __u64 requested,
721 __u64 completed)
722{
723 spin_lock(&mirror->lock);
724 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
725 requested, completed,
e76d28dd 726 ktime_get(), task->tk_start);
06946c6a 727 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 728 spin_unlock(&mirror->lock);
729}
730
731static void
0b7baf94
TM		 732nfs4_ff_layout_stat_io_start_write(struct inode *inode,
733 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 734 __u64 requested, ktime_t now)
abcb7bfc 735{
97ba375b
PT		 736 bool report;
737
abcb7bfc 738 spin_lock(&mirror->lock);
e76d28dd 739 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc 740 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
06946c6a 741 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 742 spin_unlock(&mirror->lock);
97ba375b
PT		 743
744 if (report)
0b7baf94 745 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 746}
747
748static void
749nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
750 struct nfs4_ff_layout_mirror *mirror,
751 __u64 requested,
752 __u64 completed,
753 enum nfs3_stable_how committed)
754{
755 if (committed == NFS_UNSTABLE)
756 requested = completed = 0;
757
758 spin_lock(&mirror->lock);
759 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 760 requested, completed, ktime_get(), task->tk_start);
06946c6a 761 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 762 spin_unlock(&mirror->lock);
763}
764
d67ae825
TH		 765static int
766ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
767 struct nfs_commit_info *cinfo,
768 gfp_t gfp_flags)
769{
770 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
771 struct pnfs_commit_bucket *buckets;
772 int size;
773
774 if (cinfo->ds->nbuckets != 0) {
775 /* This assumes there is only one RW lseg per file.
776 * To support multiple lseg per file, we need to
777 * change struct pnfs_commit_bucket to allow dynamic
778 * increasing nbuckets.
779 */
780 return 0;
781 }
782
783 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
784
785 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
786 gfp_flags);
787 if (!buckets)
788 return -ENOMEM;
789 else {
790 int i;
791
fe238e60 792 spin_lock(&cinfo->inode->i_lock);
d67ae825
TH		 793 if (cinfo->ds->nbuckets != 0)
794 kfree(buckets);
795 else {
796 cinfo->ds->buckets = buckets;
797 cinfo->ds->nbuckets = size;
798 for (i = 0; i < size; i++) {
799 INIT_LIST_HEAD(&buckets[i].written);
800 INIT_LIST_HEAD(&buckets[i].committing);
801 /* mark direct verifier as unset */
802 buckets[i].direct_verf.committed =
803 NFS_INVALID_STABLE_HOW;
804 }
805 }
fe238e60 806 spin_unlock(&cinfo->inode->i_lock);
d67ae825
TH		 807 return 0;
808 }
809}
810
811static struct nfs4_pnfs_ds *
13544412
TM		 812ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
813 int start_idx,
d67ae825
TH		 814 int *best_idx)
815{
13544412 816 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825 817 struct nfs4_pnfs_ds *ds;
3dc14735 818 bool fail_return = false;
d67ae825
TH		 819 int idx;
820
d67ae825 821 /* mirrors are sorted by efficiency */
13544412 822 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
3dc14735
TM		 823 if (idx+1 == fls->mirror_array_cnt)
824 fail_return = true;
825 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
d67ae825
TH		 826 if (ds) {
827 *best_idx = idx;
828 return ds;
829 }
830 }
831
832 return NULL;
833}
834
c7d73af2
TH		 835static void
836ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
837 struct nfs_page *req,
838 bool strict_iomode)
839{
840retry_strict:
841 pnfs_put_lseg(pgio->pg_lseg);
842 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
843 req->wb_context,
844 0,
845 NFS4_MAX_UINT64,
846 IOMODE_READ,
847 strict_iomode,
848 GFP_KERNEL);
849 if (IS_ERR(pgio->pg_lseg)) {
850 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
851 pgio->pg_lseg = NULL;
852 }
853
854 /* If we don't have checking, do get a IOMODE_RW
855 * segment, and the server wants to avoid READs
856 * there, then retry!
857 */
858 if (pgio->pg_lseg && !strict_iomode &&
859 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
860 strict_iomode = true;
861 goto retry_strict;
862 }
863}
864
d67ae825
TH		 865static void
866ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
867 struct nfs_page *req)
868{
869 struct nfs_pgio_mirror *pgm;
870 struct nfs4_ff_layout_mirror *mirror;
871 struct nfs4_pnfs_ds *ds;
872 int ds_idx;
873
3dc14735 874retry:
d67ae825 875 /* Use full layout for now */
c7d73af2
TH		 876 if (!pgio->pg_lseg)
877 ff_layout_pg_get_read(pgio, req, false);
878 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
879 ff_layout_pg_get_read(pgio, req, true);
602c4cd4 880
d67ae825
TH		 881 /* If no lseg, fall back to read through mds */
882 if (pgio->pg_lseg == NULL)
883 goto out_mds;
884
13544412 885 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
446ca219 886 if (!ds) {
3dc14735 887 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 888 goto out_mds;
3dc14735
TM		 889 pnfs_put_lseg(pgio->pg_lseg);
890 pgio->pg_lseg = NULL;
891 /* Sleep for 1 second before retrying */
892 ssleep(1);
893 goto retry;
446ca219
TH		 894 }
895
d67ae825
TH		 896 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
897
898 pgio->pg_mirror_idx = ds_idx;
899
900 /* read always uses only one mirror - idx 0 for pgio layer */
901 pgm = &pgio->pg_mirrors[0];
902 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
903
904 return;
905out_mds:
906 pnfs_put_lseg(pgio->pg_lseg);
907 pgio->pg_lseg = NULL;
908 nfs_pageio_reset_read_mds(pgio);
909}
910
911static void
912ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
913 struct nfs_page *req)
914{
915 struct nfs4_ff_layout_mirror *mirror;
916 struct nfs_pgio_mirror *pgm;
917 struct nfs_commit_info cinfo;
918 struct nfs4_pnfs_ds *ds;
919 int i;
920 int status;
921
3dc14735 922retry:
d600ad1f 923 if (!pgio->pg_lseg) {
d67ae825
TH		 924 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
925 req->wb_context,
926 0,
927 NFS4_MAX_UINT64,
928 IOMODE_RW,
c7d73af2 929 false,
d67ae825 930 GFP_NOFS);
d600ad1f
PT		 931 if (IS_ERR(pgio->pg_lseg)) {
932 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
933 pgio->pg_lseg = NULL;
934 return;
935 }
936 }
d67ae825
TH		 937 /* If no lseg, fall back to write through mds */
938 if (pgio->pg_lseg == NULL)
939 goto out_mds;
940
941 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
942 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
943 if (status < 0)
944 goto out_mds;
945
946 /* Use a direct mapping of ds_idx to pgio mirror_idx */
947 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
948 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
949 goto out_mds;
950
951 for (i = 0; i < pgio->pg_mirror_count; i++) {
952 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
446ca219 953 if (!ds) {
3dc14735 954 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 955 goto out_mds;
3dc14735
TM		 956 pnfs_put_lseg(pgio->pg_lseg);
957 pgio->pg_lseg = NULL;
958 /* Sleep for 1 second before retrying */
959 ssleep(1);
960 goto retry;
446ca219 961 }
d67ae825
TH		 962 pgm = &pgio->pg_mirrors[i];
963 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
964 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
965 }
966
967 return;
968
969out_mds:
970 pnfs_put_lseg(pgio->pg_lseg);
971 pgio->pg_lseg = NULL;
972 nfs_pageio_reset_write_mds(pgio);
973}
974
975static unsigned int
976ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
977 struct nfs_page *req)
978{
d600ad1f 979 if (!pgio->pg_lseg) {
d67ae825
TH		 980 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
981 req->wb_context,
982 0,
983 NFS4_MAX_UINT64,
984 IOMODE_RW,
c7d73af2 985 false,
d67ae825 986 GFP_NOFS);
d600ad1f
PT		 987 if (IS_ERR(pgio->pg_lseg)) {
988 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
989 pgio->pg_lseg = NULL;
990 goto out;
991 }
992 }
d67ae825
TH		 993 if (pgio->pg_lseg)
994 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
995
996 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 997 nfs_pageio_reset_write_mds(pgio);
d600ad1f 998out:
d67ae825
TH		 999 return 1;
1000}
1001
1002static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1003 .pg_init = ff_layout_pg_init_read,
1004 .pg_test = pnfs_generic_pg_test,
1005 .pg_doio = pnfs_generic_pg_readpages,
1006 .pg_cleanup = pnfs_generic_pg_cleanup,
1007};
1008
1009static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1010 .pg_init = ff_layout_pg_init_write,
1011 .pg_test = pnfs_generic_pg_test,
1012 .pg_doio = pnfs_generic_pg_writepages,
1013 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1014 .pg_cleanup = pnfs_generic_pg_cleanup,
1015};
1016
1017static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1018{
1019 struct rpc_task *task = &hdr->task;
1020
1021 pnfs_layoutcommit_inode(hdr->inode, false);
1022
1023 if (retry_pnfs) {
1024 dprintk("%s Reset task %5u for i/o through pNFS "
1025 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1026 hdr->task.tk_pid,
1027 hdr->inode->i_sb->s_id,
1028 (unsigned long long)NFS_FILEID(hdr->inode),
1029 hdr->args.count,
1030 (unsigned long long)hdr->args.offset);
1031
dc602dd7 1032 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1033 return;
1034 }
1035
1036 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1037 dprintk("%s Reset task %5u for i/o through MDS "
1038 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1039 hdr->task.tk_pid,
1040 hdr->inode->i_sb->s_id,
1041 (unsigned long long)NFS_FILEID(hdr->inode),
1042 hdr->args.count,
1043 (unsigned long long)hdr->args.offset);
1044
1045 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1046 }
1047}
1048
1049static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1050{
1051 struct rpc_task *task = &hdr->task;
1052
1053 pnfs_layoutcommit_inode(hdr->inode, false);
1054
1055 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1056 dprintk("%s Reset task %5u for i/o through MDS "
1057 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1058 hdr->task.tk_pid,
1059 hdr->inode->i_sb->s_id,
1060 (unsigned long long)NFS_FILEID(hdr->inode),
1061 hdr->args.count,
1062 (unsigned long long)hdr->args.offset);
1063
1064 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1065 }
1066}
1067
1068static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1069 struct nfs4_state *state,
1070 struct nfs_client *clp,
1071 struct pnfs_layout_segment *lseg,
1072 int idx)
1073{
1074 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1075 struct inode *inode = lo->plh_inode;
1076 struct nfs_server *mds_server = NFS_SERVER(inode);
1077
1078 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1079 struct nfs_client *mds_client = mds_server->nfs_client;
1080 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1081
1082 if (task->tk_status >= 0)
1083 return 0;
1084
1085 switch (task->tk_status) {
1086 /* MDS state errors */
1087 case -NFS4ERR_DELEG_REVOKED:
1088 case -NFS4ERR_ADMIN_REVOKED:
1089 case -NFS4ERR_BAD_STATEID:
1090 if (state == NULL)
1091 break;
41020b67 1092 nfs_remove_bad_delegation(state->inode, NULL);
d67ae825
TH		 1093 case -NFS4ERR_OPENMODE:
1094 if (state == NULL)
1095 break;
1096 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1097 goto out_bad_stateid;
1098 goto wait_on_recovery;
1099 case -NFS4ERR_EXPIRED:
1100 if (state != NULL) {
1101 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1102 goto out_bad_stateid;
1103 }
1104 nfs4_schedule_lease_recovery(mds_client);
1105 goto wait_on_recovery;
1106 /* DS session errors */
1107 case -NFS4ERR_BADSESSION:
1108 case -NFS4ERR_BADSLOT:
1109 case -NFS4ERR_BAD_HIGH_SLOT:
1110 case -NFS4ERR_DEADSESSION:
1111 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1112 case -NFS4ERR_SEQ_FALSE_RETRY:
1113 case -NFS4ERR_SEQ_MISORDERED:
1114 dprintk("%s ERROR %d, Reset session. Exchangeid "
1115 "flags 0x%x\n", __func__, task->tk_status,
1116 clp->cl_exchange_flags);
1117 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1118 break;
1119 case -NFS4ERR_DELAY:
1120 case -NFS4ERR_GRACE:
1121 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1122 break;
1123 case -NFS4ERR_RETRY_UNCACHED_REP:
1124 break;
1125 /* Invalidate Layout errors */
1126 case -NFS4ERR_PNFS_NO_LAYOUT:
1127 case -ESTALE: /* mapped NFS4ERR_STALE */
1128 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1129 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1130 case -NFS4ERR_FHEXPIRED:
1131 case -NFS4ERR_WRONG_TYPE:
1132 dprintk("%s Invalid layout error %d\n", __func__,
1133 task->tk_status);
1134 /*
1135 * Destroy layout so new i/o will get a new layout.
1136 * Layout will not be destroyed until all current lseg
1137 * references are put. Mark layout as invalid to resend failed
1138 * i/o and all i/o waiting on the slot table to the MDS until
1139 * layout is destroyed and a new valid layout is obtained.
1140 */
1141 pnfs_destroy_layout(NFS_I(inode));
1142 rpc_wake_up(&tbl->slot_tbl_waitq);
1143 goto reset;
1144 /* RPC connection errors */
1145 case -ECONNREFUSED:
1146 case -EHOSTDOWN:
1147 case -EHOSTUNREACH:
1148 case -ENETUNREACH:
1149 case -EIO:
1150 case -ETIMEDOUT:
1151 case -EPIPE:
1152 dprintk("%s DS connection error %d\n", __func__,
1153 task->tk_status);
1154 nfs4_mark_deviceid_unavailable(devid);
1155 rpc_wake_up(&tbl->slot_tbl_waitq);
1156 /* fall through */
1157 default:
3b13b4b3 1158 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1159 return -NFS4ERR_RESET_TO_PNFS;
1160reset:
1161 dprintk("%s Retry through MDS. Error %d\n", __func__,
1162 task->tk_status);
1163 return -NFS4ERR_RESET_TO_MDS;
1164 }
1165out:
1166 task->tk_status = 0;
1167 return -EAGAIN;
1168out_bad_stateid:
1169 task->tk_status = -EIO;
1170 return 0;
1171wait_on_recovery:
1172 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1173 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1174 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1175 goto out;
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
1185 if (task->tk_status >= 0)
1186 return 0;
1187
90816d1d
TM		 1188 switch (task->tk_status) {
1189 /* File access problems. Don't mark the device as unavailable */
1190 case -EACCES:
1191 case -ESTALE:
1192 case -EISDIR:
1193 case -EBADHANDLE:
1194 case -ELOOP:
1195 case -ENOSPC:
1196 break;
1197 case -EJUKEBOX:
1198 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1199 goto out_retry;
1200 default:
d67ae825
TH		 1201 dprintk("%s DS connection error %d\n", __func__,
1202 task->tk_status);
1203 nfs4_mark_deviceid_unavailable(devid);
d67ae825 1204 }
90816d1d
TM		 1205 /* FIXME: Need to prevent infinite looping here. */
1206 return -NFS4ERR_RESET_TO_PNFS;
1207out_retry:
d67ae825 1208 task->tk_status = 0;
7eeea167 1209 rpc_restart_call_prepare(task);
d67ae825
TH		 1210 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1211 return -EAGAIN;
1212}
1213
1214static int ff_layout_async_handle_error(struct rpc_task *task,
1215 struct nfs4_state *state,
1216 struct nfs_client *clp,
1217 struct pnfs_layout_segment *lseg,
1218 int idx)
1219{
1220 int vers = clp->cl_nfs_mod->rpc_vers->number;
1221
1222 switch (vers) {
1223 case 3:
1224 return ff_layout_async_handle_error_v3(task, lseg, idx);
1225 case 4:
1226 return ff_layout_async_handle_error_v4(task, state, clp,
1227 lseg, idx);
1228 default:
1229 /* should never happen */
1230 WARN_ON_ONCE(1);
1231 return 0;
1232 }
1233}
1234
1235static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1236 int idx, u64 offset, u64 length,
dd52128a 1237 u32 status, int opnum, int error)
d67ae825
TH		 1238{
1239 struct nfs4_ff_layout_mirror *mirror;
1240 int err;
1241
dd52128a
TM		 1242 if (status == 0) {
1243 switch (error) {
1244 case -ETIMEDOUT:
1245 case -EPFNOSUPPORT:
1246 case -EPROTONOSUPPORT:
1247 case -EOPNOTSUPP:
1248 case -ECONNREFUSED:
1249 case -ECONNRESET:
1250 case -EHOSTDOWN:
1251 case -EHOSTUNREACH:
1252 case -ENETUNREACH:
1253 case -EADDRINUSE:
1254 case -ENOBUFS:
1255 case -EPIPE:
1256 case -EPERM:
1257 status = NFS4ERR_NXIO;
1258 break;
1259 case -EACCES:
1260 status = NFS4ERR_ACCESS;
1261 break;
1262 default:
1263 return;
1264 }
1265 }
1266
c22eeb86
PT		 1267 switch (status) {
1268 case NFS4ERR_DELAY:
1269 case NFS4ERR_GRACE:
1270 return;
1271 default:
1272 break;
1273 }
1274
d67ae825
TH		 1275 mirror = FF_LAYOUT_COMP(lseg, idx);
1276 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1277 mirror, offset, length, status, opnum,
1278 GFP_NOIO);
f95c03b2 1279 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
d67ae825
TH		 1280 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1281}
1282
1283/* NFS_PROTO call done callback routines */
d67ae825
TH		 1284static int ff_layout_read_done_cb(struct rpc_task *task,
1285 struct nfs_pgio_header *hdr)
1286{
d67ae825
TH		 1287 int err;
1288
1289 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1290 if (task->tk_status < 0)
d67ae825
TH		 1291 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1292 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1293 hdr->res.op_status, OP_READ,
1294 task->tk_status);
d67ae825
TH		 1295 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1296 hdr->ds_clp, hdr->lseg,
1297 hdr->pgio_mirror_idx);
1298
1299 switch (err) {
1300 case -NFS4ERR_RESET_TO_PNFS:
13544412
TM		 1301 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1302 hdr->pgio_mirror_idx + 1,
1303 &hdr->pgio_mirror_idx))
1304 goto out_eagain;
54e4a0df 1305 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1306 pnfs_read_resend_pnfs(hdr);
1307 return task->tk_status;
1308 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1309 ff_layout_reset_read(hdr);
1310 return task->tk_status;
1311 case -EAGAIN:
13544412 1312 goto out_eagain;
d67ae825
TH		 1313 }
1314
1315 return 0;
13544412
TM		 1316out_eagain:
1317 rpc_restart_call_prepare(task);
1318 return -EAGAIN;
d67ae825
TH		 1319}
1320
c0f5f505
TM		 1321static bool
1322ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1323{
1324 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1325}
1326
d67ae825
TH		 1327/*
1328 * We reference the rpc_cred of the first WRITE that triggers the need for
1329 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1330 * rfc5661 is not clear about which credential should be used.
1331 *
1332 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1333 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1334 * we always send layoutcommit after DS writes.
1335 */
1336static void
bc28e1c2
TM		 1337ff_layout_set_layoutcommit(struct inode *inode,
1338 struct pnfs_layout_segment *lseg,
1339 loff_t end_offset)
d67ae825 1340{
bc28e1c2 1341 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1342 return;
1343
bc28e1c2
TM		 1344 pnfs_set_layoutcommit(inode, lseg, end_offset);
1345 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1346 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1347}
1348
1349static bool
75bf47eb 1350ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
d67ae825
TH		 1351{
1352 /* No mirroring for now */
1353 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1354
1355 return ff_layout_test_devid_unavailable(node);
1356}
1357
37e9ed22
TM		 1358static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1359 struct nfs_pgio_header *hdr)
d67ae825 1360{
37e9ed22
TM		 1361 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1362 return;
0b7baf94 1363 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1364 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1365 hdr->args.count,
1366 task->tk_start);
37e9ed22
TM		 1367}
1368
1369static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1370 struct nfs_pgio_header *hdr)
1371{
1372 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1373 return;
1374 nfs4_ff_layout_stat_io_end_read(task,
1375 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1376 hdr->args.count,
1377 hdr->res.count);
1378}
abcb7bfc 1379
37e9ed22
TM		 1380static int ff_layout_read_prepare_common(struct rpc_task *task,
1381 struct nfs_pgio_header *hdr)
1382{
d67ae825
TH		 1383 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1384 rpc_exit(task, -EIO);
1385 return -EIO;
1386 }
75bf47eb
TM		 1387 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1388 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1389 return -EAGAIN;
1390 }
d67ae825 1391
37e9ed22 1392 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1393 return 0;
1394}
1395
1396/*
1397 * Call ops for the async read/write cases
1398 * In the case of dense layouts, the offset needs to be reset to its
1399 * original value.
1400 */
1401static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1402{
1403 struct nfs_pgio_header *hdr = data;
1404
1405 if (ff_layout_read_prepare_common(task, hdr))
1406 return;
1407
1408 rpc_call_start(task);
1409}
1410
1411static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1412 struct nfs4_sequence_args *args,
1413 struct nfs4_sequence_res *res,
1414 struct rpc_task *task)
1415{
1416 if (ds_clp->cl_session)
1417 return nfs41_setup_sequence(ds_clp->cl_session,
1418 args,
1419 res,
1420 task);
1421 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1422 args,
1423 res,
1424 task);
1425}
1426
1427static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1428{
1429 struct nfs_pgio_header *hdr = data;
1430
d67ae825
TH		 1431 if (ff_layout_setup_sequence(hdr->ds_clp,
1432 &hdr->args.seq_args,
1433 &hdr->res.seq_res,
1434 task))
1435 return;
1436
abcb7bfc
TM		 1437 if (ff_layout_read_prepare_common(task, hdr))
1438 return;
1439
d67ae825
TH		 1440 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1441 hdr->args.lock_context, FMODE_READ) == -EIO)
1442 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1443}
1444
1445static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1446{
1447 struct nfs_pgio_header *hdr = data;
1448
1449 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1450
1451 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1452 task->tk_status == 0) {
1453 nfs4_sequence_done(task, &hdr->res.seq_res);
1454 return;
1455 }
1456
1457 /* Note this may cause RPC to be resent */
1458 hdr->mds_ops->rpc_call_done(task, hdr);
1459}
1460
1461static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1462{
1463 struct nfs_pgio_header *hdr = data;
1464
37e9ed22 1465 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1466 rpc_count_iostats_metrics(task,
1467 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1468}
1469
4d0ac221
TM		 1470static void ff_layout_read_release(void *data)
1471{
1472 struct nfs_pgio_header *hdr = data;
1473
1474 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1475 pnfs_generic_rw_release(data);
1476}
1477
1478
d67ae825
TH		 1479static int ff_layout_write_done_cb(struct rpc_task *task,
1480 struct nfs_pgio_header *hdr)
1481{
2e18d4d8 1482 loff_t end_offs = 0;
d67ae825
TH		 1483 int err;
1484
1485 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1486 if (task->tk_status < 0)
d67ae825
TH		 1487 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1488 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1489 hdr->res.op_status, OP_WRITE,
1490 task->tk_status);
d67ae825
TH		 1491 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1492 hdr->ds_clp, hdr->lseg,
1493 hdr->pgio_mirror_idx);
1494
1495 switch (err) {
1496 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1497 ff_layout_reset_write(hdr, true);
1498 return task->tk_status;
d67ae825 1499 case -NFS4ERR_RESET_TO_MDS:
7cc8c5cd 1500 ff_layout_reset_write(hdr, false);
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);
1572}
abcb7bfc 1573
37e9ed22
TM		 1574static int ff_layout_write_prepare_common(struct rpc_task *task,
1575 struct nfs_pgio_header *hdr)
1576{
d67ae825
TH		 1577 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1578 rpc_exit(task, -EIO);
1579 return -EIO;
1580 }
1581
75bf47eb
TM		 1582 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1583 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1584 return -EAGAIN;
1585 }
1586
37e9ed22 1587 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1588 return 0;
1589}
1590
1591static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1592{
1593 struct nfs_pgio_header *hdr = data;
1594
1595 if (ff_layout_write_prepare_common(task, hdr))
1596 return;
1597
1598 rpc_call_start(task);
1599}
1600
1601static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1602{
1603 struct nfs_pgio_header *hdr = data;
1604
d67ae825
TH		 1605 if (ff_layout_setup_sequence(hdr->ds_clp,
1606 &hdr->args.seq_args,
1607 &hdr->res.seq_res,
1608 task))
1609 return;
1610
abcb7bfc
TM		 1611 if (ff_layout_write_prepare_common(task, hdr))
1612 return;
1613
d67ae825
TH		 1614 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1615 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1616 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1617}
1618
1619static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1620{
1621 struct nfs_pgio_header *hdr = data;
1622
1623 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1624 task->tk_status == 0) {
1625 nfs4_sequence_done(task, &hdr->res.seq_res);
1626 return;
1627 }
1628
1629 /* Note this may cause RPC to be resent */
1630 hdr->mds_ops->rpc_call_done(task, hdr);
1631}
1632
1633static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1634{
1635 struct nfs_pgio_header *hdr = data;
1636
37e9ed22 1637 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1638 rpc_count_iostats_metrics(task,
1639 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1640}
1641
4d0ac221
TM		 1642static void ff_layout_write_release(void *data)
1643{
1644 struct nfs_pgio_header *hdr = data;
1645
1646 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1647 pnfs_generic_rw_release(data);
1648}
1649
37e9ed22 1650static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1651 struct nfs_commit_data *cdata)
1652{
37e9ed22
TM		 1653 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1654 return;
0b7baf94 1655 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1656 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1657 0, task->tk_start);
abcb7bfc
TM		 1658}
1659
37e9ed22
TM		 1660static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1661 struct nfs_commit_data *cdata)
1662{
1663 struct nfs_page *req;
1664 __u64 count = 0;
1665
1666 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1667 return;
1668
1669 if (task->tk_status == 0) {
1670 list_for_each_entry(req, &cdata->pages, wb_list)
1671 count += req->wb_bytes;
1672 }
1673 nfs4_ff_layout_stat_io_end_write(task,
1674 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1675 count, count, NFS_FILE_SYNC);
1676}
1677
1678static void ff_layout_commit_prepare_common(struct rpc_task *task,
1679 struct nfs_commit_data *cdata)
1680{
1681 ff_layout_commit_record_layoutstats_start(task, cdata);
1682}
1683
d67ae825
TH		 1684static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1685{
abcb7bfc 1686 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1687 rpc_call_start(task);
1688}
1689
1690static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1691{
1692 struct nfs_commit_data *wdata = data;
1693
abcb7bfc 1694 if (ff_layout_setup_sequence(wdata->ds_clp,
d67ae825
TH		 1695 &wdata->args.seq_args,
1696 &wdata->res.seq_res,
abcb7bfc
TM		 1697 task))
1698 return;
1699 ff_layout_commit_prepare_common(task, data);
1700}
1701
1702static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1703{
1704 pnfs_generic_write_commit_done(task, data);
1705}
1706
1707static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1708{
1709 struct nfs_commit_data *cdata = data;
abcb7bfc 1710
37e9ed22 1711 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1712 rpc_count_iostats_metrics(task,
1713 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1714}
1715
4d0ac221
TM		 1716static void ff_layout_commit_release(void *data)
1717{
1718 struct nfs_commit_data *cdata = data;
1719
1720 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1721 pnfs_generic_commit_release(data);
1722}
1723
d67ae825
TH		 1724static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1725 .rpc_call_prepare = ff_layout_read_prepare_v3,
1726 .rpc_call_done = ff_layout_read_call_done,
1727 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1728 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1729};
1730
1731static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1732 .rpc_call_prepare = ff_layout_read_prepare_v4,
1733 .rpc_call_done = ff_layout_read_call_done,
1734 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1735 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1736};
1737
1738static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1739 .rpc_call_prepare = ff_layout_write_prepare_v3,
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,
1747 .rpc_call_done = ff_layout_write_call_done,
1748 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1749 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1750};
1751
1752static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1753 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1754 .rpc_call_done = ff_layout_commit_done,
d67ae825 1755 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1756 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1757};
1758
1759static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1760 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1761 .rpc_call_done = ff_layout_commit_done,
d67ae825 1762 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1763 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1764};
1765
1766static enum pnfs_try_status
1767ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1768{
1769 struct pnfs_layout_segment *lseg = hdr->lseg;
1770 struct nfs4_pnfs_ds *ds;
1771 struct rpc_clnt *ds_clnt;
1772 struct rpc_cred *ds_cred;
1773 loff_t offset = hdr->args.offset;
1774 u32 idx = hdr->pgio_mirror_idx;
1775 int vers;
1776 struct nfs_fh *fh;
1777
1778 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1779 __func__, hdr->inode->i_ino,
1780 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1781
1782 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1783 if (!ds)
1784 goto out_failed;
1785
1786 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1787 hdr->inode);
1788 if (IS_ERR(ds_clnt))
1789 goto out_failed;
1790
1791 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1792 if (!ds_cred)
d67ae825
TH		 1793 goto out_failed;
1794
1795 vers = nfs4_ff_layout_ds_version(lseg, idx);
1796
1797 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1798 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1799
75bf47eb 1800 hdr->pgio_done_cb = ff_layout_read_done_cb;
d67ae825
TH		 1801 atomic_inc(&ds->ds_clp->cl_count);
1802 hdr->ds_clp = ds->ds_clp;
1803 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1804 if (fh)
1805 hdr->args.fh = fh;
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 hdr->mds_offset = offset;
1812
1813 /* Perform an asynchronous read to ds */
1814 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1815 vers == 3 ? &ff_layout_read_call_ops_v3 :
1816 &ff_layout_read_call_ops_v4,
1817 0, RPC_TASK_SOFTCONN);
57f3f4c0 1818 put_rpccred(ds_cred);
d67ae825
TH		 1819 return PNFS_ATTEMPTED;
1820
1821out_failed:
3b13b4b3 1822 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1823 return PNFS_TRY_AGAIN;
1824 return PNFS_NOT_ATTEMPTED;
1825}
1826
1827/* Perform async writes. */
1828static enum pnfs_try_status
1829ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1830{
1831 struct pnfs_layout_segment *lseg = hdr->lseg;
1832 struct nfs4_pnfs_ds *ds;
1833 struct rpc_clnt *ds_clnt;
1834 struct rpc_cred *ds_cred;
1835 loff_t offset = hdr->args.offset;
1836 int vers;
1837 struct nfs_fh *fh;
1838 int idx = hdr->pgio_mirror_idx;
1839
1840 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1841 if (!ds)
1842 return PNFS_NOT_ATTEMPTED;
1843
1844 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1845 hdr->inode);
1846 if (IS_ERR(ds_clnt))
1847 return PNFS_NOT_ATTEMPTED;
1848
1849 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1850 if (!ds_cred)
d67ae825
TH		 1851 return PNFS_NOT_ATTEMPTED;
1852
1853 vers = nfs4_ff_layout_ds_version(lseg, idx);
1854
1855 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1856 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1857 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1858 vers);
1859
1860 hdr->pgio_done_cb = ff_layout_write_done_cb;
1861 atomic_inc(&ds->ds_clp->cl_count);
1862 hdr->ds_clp = ds->ds_clp;
1863 hdr->ds_commit_idx = idx;
1864 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1865 if (fh)
1866 hdr->args.fh = fh;
1867
1868 /*
1869 * Note that if we ever decide to split across DSes,
1870 * then we may need to handle dense-like offsets.
1871 */
1872 hdr->args.offset = offset;
1873
1874 /* Perform an asynchronous write */
1875 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1876 vers == 3 ? &ff_layout_write_call_ops_v3 :
1877 &ff_layout_write_call_ops_v4,
1878 sync, RPC_TASK_SOFTCONN);
57f3f4c0 1879 put_rpccred(ds_cred);
d67ae825
TH		 1880 return PNFS_ATTEMPTED;
1881}
1882
d67ae825
TH		 1883static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1884{
1885 return i;
1886}
1887
1888static struct nfs_fh *
1889select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1890{
1891 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1892
1893 /* FIXME: Assume that there is only one NFS version available
1894 * for the DS.
1895 */
1896 return &flseg->mirror_array[i]->fh_versions[0];
1897}
1898
1899static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1900{
1901 struct pnfs_layout_segment *lseg = data->lseg;
1902 struct nfs4_pnfs_ds *ds;
1903 struct rpc_clnt *ds_clnt;
1904 struct rpc_cred *ds_cred;
1905 u32 idx;
57f3f4c0 1906 int vers, ret;
d67ae825
TH		 1907 struct nfs_fh *fh;
1908
1909 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1910 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1911 if (!ds)
1912 goto out_err;
1913
1914 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1915 data->inode);
1916 if (IS_ERR(ds_clnt))
1917 goto out_err;
1918
1919 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
57f3f4c0 1920 if (!ds_cred)
d67ae825
TH		 1921 goto out_err;
1922
1923 vers = nfs4_ff_layout_ds_version(lseg, idx);
1924
1925 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1926 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1927 vers);
1928 data->commit_done_cb = ff_layout_commit_done_cb;
1929 data->cred = ds_cred;
1930 atomic_inc(&ds->ds_clp->cl_count);
1931 data->ds_clp = ds->ds_clp;
1932 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1933 if (fh)
1934 data->args.fh = fh;
abcb7bfc 1935
57f3f4c0 1936 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1937 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1938 &ff_layout_commit_call_ops_v4,
1939 how, RPC_TASK_SOFTCONN);
57f3f4c0
JL		 1940 put_rpccred(ds_cred);
1941 return ret;
d67ae825
TH		 1942out_err:
1943 pnfs_generic_prepare_to_resend_writes(data);
1944 pnfs_generic_commit_release(data);
1945 return -EAGAIN;
1946}
1947
1948static int
1949ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1950 int how, struct nfs_commit_info *cinfo)
1951{
1952 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1953 ff_layout_initiate_commit);
1954}
1955
1956static struct pnfs_ds_commit_info *
1957ff_layout_get_ds_info(struct inode *inode)
1958{
1959 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1960
1961 if (layout == NULL)
1962 return NULL;
1963
1964 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1965}
1966
1967static void
fc87701b 1968ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1969{
1970 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1971 id_node));
1972}
1973
1974static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1975 struct xdr_stream *xdr,
5b9b3c85
TM		 1976 const struct nfs4_layoutreturn_args *args,
1977 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1978{
d67ae825 1979 __be32 *start;
d67ae825
TH		 1980
1981 start = xdr_reserve_space(xdr, 4);
1982 if (unlikely(!start))
1983 return -E2BIG;
1984
5b9b3c85 1985 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 1986 /* This assume we always return _ALL_ layouts */
5b9b3c85 1987 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 1988}
1989
1990/* report nothing for now */
1991static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1992 struct xdr_stream *xdr,
1993 const struct nfs4_layoutreturn_args *args)
1994{
1995 __be32 *p;
1996
1997 p = xdr_reserve_space(xdr, 4);
1998 if (likely(p))
1999 *p = cpu_to_be32(0);
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;
94e5c571 2020 struct pnfs_layout_hdr *lo = args->layout;
d67ae825
TH		 2021 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
2022 __be32 *start;
2023
2024 dprintk("%s: Begin\n", __func__);
2025 start = xdr_reserve_space(xdr, 4);
2026 BUG_ON(!start);
2027
5b9b3c85 2028 ff_layout_encode_ioerr(flo, xdr, args, ff_opaque->data);
d67ae825 2029 ff_layout_encode_iostats(flo, xdr, args);
082fa37d 2030
d67ae825
TH		 2031 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2032 dprintk("%s: Return\n", __func__);
2033}
2034
5b9b3c85
TM		 2035static void
2036ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2037{
2038 struct nfs4_flexfile_layoutreturn_args *ff_args;
2039
2040 if (!args->data)
2041 return;
2042 ff_args = args->data;
2043 args->data = NULL;
2044
2045 ff_layout_free_ds_ioerr(&ff_args->errors);
2046
2047 kfree(ff_args);
2048}
2049
2050const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2051 .encode = ff_layout_encode_layoutreturn,
2052 .free = ff_layout_free_layoutreturn,
2053};
2054
2055static int
2056ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2057{
2058 struct nfs4_flexfile_layoutreturn_args *ff_args;
2059
2060 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2061 if (!ff_args)
2062 return -ENOMEM;
2063
2064 INIT_LIST_HEAD(&ff_args->errors);
2065 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2066 &args->range, &ff_args->errors,
2067 FF_LAYOUTRETURN_MAXERR);
2068
2069 args->ld_private->ops = &layoutreturn_ops;
2070 args->ld_private->data = ff_args;
2071 return 0;
2072}
2073
27c43064
PT		 2074static int
2075ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2076{
2077 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2078
2079 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2080}
2081
2082static size_t
2083ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2084 const int buflen)
2085{
2086 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2087 const struct in6_addr *addr = &sin6->sin6_addr;
2088
2089 /*
2090 * RFC 4291, Section 2.2.2
2091 *
2092 * Shorthanded ANY address
2093 */
2094 if (ipv6_addr_any(addr))
2095 return snprintf(buf, buflen, "::");
2096
2097 /*
2098 * RFC 4291, Section 2.2.2
2099 *
2100 * Shorthanded loopback address
2101 */
2102 if (ipv6_addr_loopback(addr))
2103 return snprintf(buf, buflen, "::1");
2104
2105 /*
2106 * RFC 4291, Section 2.2.3
2107 *
2108 * Special presentation address format for mapped v4
2109 * addresses.
2110 */
2111 if (ipv6_addr_v4mapped(addr))
2112 return snprintf(buf, buflen, "::ffff:%pI4",
2113 &addr->s6_addr32[3]);
2114
2115 /*
2116 * RFC 4291, Section 2.2.1
2117 */
2118 return snprintf(buf, buflen, "%pI6c", addr);
2119}
2120
2121/* Derived from rpc_sockaddr2uaddr */
2122static void
2123ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2124{
2125 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2126 char portbuf[RPCBIND_MAXUADDRPLEN];
2127 char addrbuf[RPCBIND_MAXUADDRLEN];
2128 char *netid;
2129 unsigned short port;
2130 int len, netid_len;
2131 __be32 *p;
2132
2133 switch (sap->sa_family) {
2134 case AF_INET:
2135 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2136 return;
2137 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2138 netid = "tcp";
2139 netid_len = 3;
2140 break;
2141 case AF_INET6:
2142 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2143 return;
2144 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2145 netid = "tcp6";
2146 netid_len = 4;
2147 break;
2148 default:
2149 /* we only support tcp and tcp6 */
2150 WARN_ON_ONCE(1);
2151 return;
2152 }
2153
2154 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2155 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2156
2157 p = xdr_reserve_space(xdr, 4 + netid_len);
2158 xdr_encode_opaque(p, netid, netid_len);
2159
2160 p = xdr_reserve_space(xdr, 4 + len);
2161 xdr_encode_opaque(p, addrbuf, len);
2162}
2163
2164static void
2165ff_layout_encode_nfstime(struct xdr_stream *xdr,
2166 ktime_t t)
2167{
2168 struct timespec64 ts;
2169 __be32 *p;
2170
2171 p = xdr_reserve_space(xdr, 12);
2172 ts = ktime_to_timespec64(t);
2173 p = xdr_encode_hyper(p, ts.tv_sec);
2174 *p++ = cpu_to_be32(ts.tv_nsec);
2175}
2176
2177static void
2178ff_layout_encode_io_latency(struct xdr_stream *xdr,
2179 struct nfs4_ff_io_stat *stat)
2180{
2181 __be32 *p;
2182
2183 p = xdr_reserve_space(xdr, 5 * 8);
2184 p = xdr_encode_hyper(p, stat->ops_requested);
2185 p = xdr_encode_hyper(p, stat->bytes_requested);
2186 p = xdr_encode_hyper(p, stat->ops_completed);
2187 p = xdr_encode_hyper(p, stat->bytes_completed);
2188 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2189 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2190 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2191}
2192
2193static void
2194ff_layout_encode_layoutstats(struct xdr_stream *xdr,
2195 struct nfs42_layoutstat_args *args,
2196 struct nfs42_layoutstat_devinfo *devinfo)
2197{
2198 struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private;
2199 struct nfs4_pnfs_ds_addr *da;
2200 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2201 struct nfs_fh *fh = &mirror->fh_versions[0];
2202 __be32 *p, *start;
2203
2204 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2205 dprintk("%s: DS %s: encoding address %s\n",
2206 __func__, ds->ds_remotestr, da->da_remotestr);
2207 /* layoutupdate length */
2208 start = xdr_reserve_space(xdr, 4);
2209 /* netaddr4 */
2210 ff_layout_encode_netaddr(xdr, da);
2211 /* nfs_fh4 */
2212 p = xdr_reserve_space(xdr, 4 + fh->size);
2213 xdr_encode_opaque(p, fh->data, fh->size);
2214 /* ff_io_latency4 read */
2215 spin_lock(&mirror->lock);
2216 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2217 /* ff_io_latency4 write */
2218 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2219 spin_unlock(&mirror->lock);
2220 /* nfstime4 */
2221 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2222 /* bool */
2223 p = xdr_reserve_space(xdr, 4);
2224 *p = cpu_to_be32(false);
2225
2226 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2227}
2228
266d12d4 2229static int
ad4dc53e 2230ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
266d12d4
TM		 2231 struct pnfs_layout_hdr *lo,
2232 int dev_limit)
ad4dc53e 2233{
266d12d4 2234 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2235 struct nfs4_ff_layout_mirror *mirror;
2236 struct nfs4_deviceid_node *dev;
2237 struct nfs42_layoutstat_devinfo *devinfo;
266d12d4 2238 int i = 0;
ad4dc53e 2239
266d12d4
TM		 2240 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2241 if (i >= dev_limit)
ad4dc53e 2242 break;
266d12d4 2243 if (!mirror->mirror_ds)
27c43064 2244 continue;
06946c6a
TM		 2245 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2246 continue;
266d12d4
TM		 2247 /* mirror refcount put in cleanup_layoutstats */
2248 if (!atomic_inc_not_zero(&mirror->ref))
2249 continue;
2250 dev = &mirror->mirror_ds->id_node;
2251 devinfo = &args->devinfo[i];
ad4dc53e 2252 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2253 devinfo->offset = 0;
2254 devinfo->length = NFS4_MAX_UINT64;
d099d7b8 2255 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2256 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2257 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e
PT		 2258 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2259 devinfo->layout_type = LAYOUT_FLEX_FILES;
27c43064
PT		 2260 devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
2261 devinfo->layout_private = mirror;
ad4dc53e 2262
266d12d4 2263 i++;
ad4dc53e 2264 }
266d12d4 2265 return i;
ad4dc53e
PT		 2266}
2267
2268static int
2269ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2270{
266d12d4
TM		 2271 struct nfs4_flexfile_layout *ff_layout;
2272 struct nfs4_ff_layout_mirror *mirror;
ad4dc53e
PT		 2273 int dev_count = 0;
2274
2275 spin_lock(&args->inode->i_lock);
266d12d4
TM		 2276 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2277 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2278 if (atomic_read(&mirror->ref) != 0)
2279 dev_count ++;
ad4dc53e
PT		 2280 }
2281 spin_unlock(&args->inode->i_lock);
2282 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2283 if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
2284 dprintk("%s: truncating devinfo to limit (%d:%d)\n",
2285 __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
2286 dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2287 }
266d12d4 2288 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2289 if (!args->devinfo)
2290 return -ENOMEM;
2291
ad4dc53e 2292 spin_lock(&args->inode->i_lock);
266d12d4
TM		 2293 args->num_dev = ff_layout_mirror_prepare_stats(args,
2294 &ff_layout->generic_hdr, dev_count);
ad4dc53e 2295 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2296 if (!args->num_dev) {
2297 kfree(args->devinfo);
2298 args->devinfo = NULL;
2299 return -ENOENT;
2300 }
ad4dc53e
PT		 2301
2302 return 0;
2303}
2304
27c43064
PT		 2305static void
2306ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data)
2307{
2308 struct nfs4_ff_layout_mirror *mirror;
2309 int i;
2310
2311 for (i = 0; i < data->args.num_dev; i++) {
2312 mirror = data->args.devinfo[i].layout_private;
2313 data->args.devinfo[i].layout_private = NULL;
0b7baf94 2314 ff_layout_put_mirror(mirror);
27c43064
PT		 2315 }
2316}
2317
d67ae825
TH		 2318static struct pnfs_layoutdriver_type flexfilelayout_type = {
2319 .id = LAYOUT_FLEX_FILES,
2320 .name = "LAYOUT_FLEX_FILES",
2321 .owner = THIS_MODULE,
2322 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2323 .free_layout_hdr = ff_layout_free_layout_hdr,
2324 .alloc_lseg = ff_layout_alloc_lseg,
2325 .free_lseg = ff_layout_free_lseg,
0762ed2c 2326 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2327 .pg_read_ops = &ff_layout_pg_read_ops,
2328 .pg_write_ops = &ff_layout_pg_write_ops,
2329 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2330 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 2331 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 2332 .clear_request_commit = pnfs_generic_clear_request_commit,
2333 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2334 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2335 .commit_pagelist = ff_layout_commit_pagelist,
2336 .read_pagelist = ff_layout_read_pagelist,
2337 .write_pagelist = ff_layout_write_pagelist,
2338 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2339 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2340 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2341 .prepare_layoutstats = ff_layout_prepare_layoutstats,
27c43064 2342 .cleanup_layoutstats = ff_layout_cleanup_layoutstats,
d67ae825
TH		 2343};
2344
2345static int __init nfs4flexfilelayout_init(void)
2346{
2347 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2348 __func__);
90a0be00
JL		 2349 if (!ff_zero_group) {
2350 ff_zero_group = groups_alloc(0);
2351 if (!ff_zero_group)
2352 return -ENOMEM;
2353 }
d67ae825
TH		 2354 return pnfs_register_layoutdriver(&flexfilelayout_type);
2355}
2356
2357static void __exit nfs4flexfilelayout_exit(void)
2358{
2359 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2360 __func__);
2361 pnfs_unregister_layoutdriver(&flexfilelayout_type);
90a0be00
JL		 2362 if (ff_zero_group) {
2363 put_group_info(ff_zero_group);
2364 ff_zero_group = NULL;
2365 }
d67ae825
TH		 2366}
2367
2368MODULE_ALIAS("nfs-layouttype4-4");
2369
2370MODULE_LICENSE("GPL");
2371MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2372
2373module_init(nfs4flexfilelayout_init);
2374module_exit(nfs4flexfilelayout_exit);
Ubuntu Artful kernel mirror