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pNFS: Layoutreturn must free the layout after the layout-private data
[people/ms/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) {
186 if (mirror->mirror_ds != pos->mirror_ds)
187 continue;
188 if (!ff_mirror_match_fh(mirror, pos))
189 continue;
190 if (atomic_inc_not_zero(&pos->ref)) {
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);
221 atomic_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{
245 if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
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
260074cd
TM		 363static void ff_layout_mark_devices_valid(struct nfs4_ff_layout_segment *fls)
364{
365 struct nfs4_deviceid_node *node;
366 int i;
367
368 if (!(fls->flags & FF_FLAGS_NO_IO_THRU_MDS))
369 return;
370 for (i = 0; i < fls->mirror_array_cnt; i++) {
371 node = &fls->mirror_array[i]->mirror_ds->id_node;
372 clear_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags);
373 }
374}
375
d67ae825
TH		 376static struct pnfs_layout_segment *
377ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
378 struct nfs4_layoutget_res *lgr,
379 gfp_t gfp_flags)
380{
381 struct pnfs_layout_segment *ret;
382 struct nfs4_ff_layout_segment *fls = NULL;
383 struct xdr_stream stream;
384 struct xdr_buf buf;
385 struct page *scratch;
386 u64 stripe_unit;
387 u32 mirror_array_cnt;
388 __be32 *p;
389 int i, rc;
390
391 dprintk("--> %s\n", __func__);
392 scratch = alloc_page(gfp_flags);
393 if (!scratch)
394 return ERR_PTR(-ENOMEM);
395
396 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
397 lgr->layoutp->len);
398 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
399
400 /* stripe unit and mirror_array_cnt */
401 rc = -EIO;
402 p = xdr_inline_decode(&stream, 8 + 4);
403 if (!p)
404 goto out_err_free;
405
406 p = xdr_decode_hyper(p, &stripe_unit);
407 mirror_array_cnt = be32_to_cpup(p++);
408 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
409 stripe_unit, mirror_array_cnt);
410
411 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
412 mirror_array_cnt == 0)
413 goto out_err_free;
414
415 rc = -ENOMEM;
416 fls = kzalloc(sizeof(*fls), gfp_flags);
417 if (!fls)
418 goto out_err_free;
419
420 fls->mirror_array_cnt = mirror_array_cnt;
421 fls->stripe_unit = stripe_unit;
422 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
423 sizeof(fls->mirror_array[0]), gfp_flags);
424 if (fls->mirror_array == NULL)
425 goto out_err_free;
426
427 for (i = 0; i < fls->mirror_array_cnt; i++) {
266d12d4 428 struct nfs4_ff_layout_mirror *mirror;
d67ae825
TH		 429 struct nfs4_deviceid devid;
430 struct nfs4_deviceid_node *idnode;
90a0be00 431 struct auth_cred acred = { .group_info = ff_zero_group };
3064b686 432 struct rpc_cred __rcu *cred;
90a0be00 433 u32 ds_count, fh_count, id;
d67ae825
TH		 434 int j;
435
436 rc = -EIO;
437 p = xdr_inline_decode(&stream, 4);
438 if (!p)
439 goto out_err_free;
440 ds_count = be32_to_cpup(p);
441
442 /* FIXME: allow for striping? */
443 if (ds_count != 1)
444 goto out_err_free;
445
28a0d72c 446 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
d67ae825
TH		 447 if (fls->mirror_array[i] == NULL) {
448 rc = -ENOMEM;
449 goto out_err_free;
450 }
451
d67ae825
TH		 452 fls->mirror_array[i]->ds_count = ds_count;
453
454 /* deviceid */
455 rc = decode_deviceid(&stream, &devid);
456 if (rc)
457 goto out_err_free;
458
459 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
460 &devid, lh->plh_lc_cred,
461 gfp_flags);
462 /*
463 * upon success, mirror_ds is allocated by previous
464 * getdeviceinfo, or newly by .alloc_deviceid_node
465 * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
466 */
467 if (idnode)
468 fls->mirror_array[i]->mirror_ds =
469 FF_LAYOUT_MIRROR_DS(idnode);
470 else
471 goto out_err_free;
472
473 /* efficiency */
474 rc = -EIO;
475 p = xdr_inline_decode(&stream, 4);
476 if (!p)
477 goto out_err_free;
478 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
479
480 /* stateid */
93b717fd 481 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
d67ae825
TH		 482 if (rc)
483 goto out_err_free;
484
485 /* fh */
486 p = xdr_inline_decode(&stream, 4);
487 if (!p)
488 goto out_err_free;
489 fh_count = be32_to_cpup(p);
490
491 fls->mirror_array[i]->fh_versions =
492 kzalloc(fh_count * sizeof(struct nfs_fh),
493 gfp_flags);
494 if (fls->mirror_array[i]->fh_versions == NULL) {
495 rc = -ENOMEM;
496 goto out_err_free;
497 }
498
499 for (j = 0; j < fh_count; j++) {
500 rc = decode_nfs_fh(&stream,
501 &fls->mirror_array[i]->fh_versions[j]);
502 if (rc)
503 goto out_err_free;
504 }
505
506 fls->mirror_array[i]->fh_versions_cnt = fh_count;
507
508 /* user */
90a0be00 509 rc = decode_name(&stream, &id);
d67ae825
TH		 510 if (rc)
511 goto out_err_free;
512
90a0be00
JL		 513 acred.uid = make_kuid(&init_user_ns, id);
514
d67ae825 515 /* group */
90a0be00 516 rc = decode_name(&stream, &id);
d67ae825
TH		 517 if (rc)
518 goto out_err_free;
519
90a0be00
JL		 520 acred.gid = make_kgid(&init_user_ns, id);
521
522 /* find the cred for it */
3064b686 523 rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
90a0be00
JL		 524 if (IS_ERR(cred)) {
525 rc = PTR_ERR(cred);
526 goto out_err_free;
527 }
528
3064b686
JL		 529 if (lgr->range.iomode == IOMODE_READ)
530 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
531 else
532 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
90a0be00 533
266d12d4
TM		 534 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
535 if (mirror != fls->mirror_array[i]) {
90a0be00 536 /* swap cred ptrs so free_mirror will clean up old */
3064b686
JL		 537 if (lgr->range.iomode == IOMODE_READ) {
538 cred = xchg(&mirror->ro_cred, cred);
539 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
540 } else {
541 cred = xchg(&mirror->rw_cred, cred);
542 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
543 }
266d12d4
TM		 544 ff_layout_free_mirror(fls->mirror_array[i]);
545 fls->mirror_array[i] = mirror;
546 }
547
3064b686
JL		 548 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
549 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
90a0be00
JL		 550 from_kuid(&init_user_ns, acred.uid),
551 from_kgid(&init_user_ns, acred.gid));
d67ae825
TH		 552 }
553
c0f5f505 554 p = xdr_inline_decode(&stream, 4);
d0379a5d
TM		 555 if (!p)
556 goto out_sort_mirrors;
557 fls->flags = be32_to_cpup(p);
558
559 p = xdr_inline_decode(&stream, 4);
560 if (!p)
561 goto out_sort_mirrors;
562 for (i=0; i < fls->mirror_array_cnt; i++)
563 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
c0f5f505 564
d0379a5d 565out_sort_mirrors:
d67ae825
TH		 566 ff_layout_sort_mirrors(fls);
567 rc = ff_layout_check_layout(lgr);
568 if (rc)
569 goto out_err_free;
260074cd 570 ff_layout_mark_devices_valid(fls);
d67ae825
TH		 571
572 ret = &fls->generic_hdr;
573 dprintk("<-- %s (success)\n", __func__);
574out_free_page:
575 __free_page(scratch);
576 return ret;
577out_err_free:
578 _ff_layout_free_lseg(fls);
579 ret = ERR_PTR(rc);
580 dprintk("<-- %s (%d)\n", __func__, rc);
581 goto out_free_page;
582}
583
584static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
585{
586 struct pnfs_layout_segment *lseg;
587
588 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
589 if (lseg->pls_range.iomode == IOMODE_RW)
590 return true;
591
592 return false;
593}
594
595static void
596ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
597{
598 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 599
600 dprintk("--> %s\n", __func__);
601
d67ae825
TH		 602 if (lseg->pls_range.iomode == IOMODE_RW) {
603 struct nfs4_flexfile_layout *ffl;
604 struct inode *inode;
605
606 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
607 inode = ffl->generic_hdr.plh_inode;
608 spin_lock(&inode->i_lock);
609 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
610 ffl->commit_info.nbuckets = 0;
611 kfree(ffl->commit_info.buckets);
612 ffl->commit_info.buckets = NULL;
613 }
614 spin_unlock(&inode->i_lock);
615 }
616 _ff_layout_free_lseg(fls);
617}
618
619/* Return 1 until we have multiple lsegs support */
620static int
621ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
622{
623 return 1;
624}
625
abcb7bfc 626static void
e76d28dd 627nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 628{
9bbd9bb4
PT		 629 /* first IO request? */
630 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 631 timer->start_time = now;
abcb7bfc
TM		 632 }
633}
634
635static ktime_t
e76d28dd 636nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 637{
e76d28dd 638 ktime_t start;
abcb7bfc 639
9bbd9bb4
PT		 640 if (atomic_dec_return(&timer->n_ops) < 0)
641 WARN_ON_ONCE(1);
642
9bbd9bb4
PT		 643 start = timer->start_time;
644 timer->start_time = now;
abcb7bfc
TM		 645 return ktime_sub(now, start);
646}
647
97ba375b 648static bool
d983803d 649nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 650 struct nfs4_ff_layoutstat *layoutstat,
651 ktime_t now)
abcb7bfc 652{
d983803d 653 static const ktime_t notime = {0};
bbf58bf3 654 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
1c8d477a 655 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
d983803d 656
e76d28dd 657 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
9bbd9bb4
PT		 658 if (ktime_equal(mirror->start_time, notime))
659 mirror->start_time = now;
d0379a5d
TM		 660 if (mirror->report_interval != 0)
661 report_interval = (s64)mirror->report_interval * 1000LL;
662 else if (layoutstats_timer != 0)
bbf58bf3 663 report_interval = (s64)layoutstats_timer * 1000LL;
1c8d477a 664 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
bbf58bf3 665 report_interval) {
1c8d477a 666 ffl->last_report_time = now;
97ba375b
PT		 667 return true;
668 }
669
670 return false;
abcb7bfc
TM		 671}
672
673static void
674nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
675 __u64 requested)
676{
677 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
678
679 iostat->ops_requested++;
680 iostat->bytes_requested += requested;
681}
682
683static void
684nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
685 __u64 requested,
686 __u64 completed,
e76d28dd
TM		 687 ktime_t time_completed,
688 ktime_t time_started)
abcb7bfc
TM		 689{
690 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 691 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 692 ktime_t timer;
693
694 iostat->ops_completed++;
695 iostat->bytes_completed += completed;
696 iostat->bytes_not_delivered += requested - completed;
697
e76d28dd 698 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 699 iostat->total_busy_time =
700 ktime_add(iostat->total_busy_time, timer);
701 iostat->aggregate_completion_time =
e76d28dd
TM		 702 ktime_add(iostat->aggregate_completion_time,
703 completion_time);
abcb7bfc
TM		 704}
705
706static void
0b7baf94
TM		 707nfs4_ff_layout_stat_io_start_read(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->read_stat, now);
abcb7bfc 715 nfs4_ff_layout_stat_io_update_requested(&mirror->read_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_KERNEL);
abcb7bfc
TM		 721}
722
723static void
724nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
725 struct nfs4_ff_layout_mirror *mirror,
726 __u64 requested,
727 __u64 completed)
728{
729 spin_lock(&mirror->lock);
730 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
731 requested, completed,
e76d28dd 732 ktime_get(), task->tk_start);
06946c6a 733 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 734 spin_unlock(&mirror->lock);
735}
736
737static void
0b7baf94
TM		 738nfs4_ff_layout_stat_io_start_write(struct inode *inode,
739 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 740 __u64 requested, ktime_t now)
abcb7bfc 741{
97ba375b
PT		 742 bool report;
743
abcb7bfc 744 spin_lock(&mirror->lock);
e76d28dd 745 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc 746 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
06946c6a 747 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 748 spin_unlock(&mirror->lock);
97ba375b
PT		 749
750 if (report)
0b7baf94 751 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 752}
753
754static void
755nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
756 struct nfs4_ff_layout_mirror *mirror,
757 __u64 requested,
758 __u64 completed,
759 enum nfs3_stable_how committed)
760{
761 if (committed == NFS_UNSTABLE)
762 requested = completed = 0;
763
764 spin_lock(&mirror->lock);
765 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 766 requested, completed, ktime_get(), task->tk_start);
06946c6a 767 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 768 spin_unlock(&mirror->lock);
769}
770
d67ae825
TH		 771static int
772ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
773 struct nfs_commit_info *cinfo,
774 gfp_t gfp_flags)
775{
776 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
777 struct pnfs_commit_bucket *buckets;
778 int size;
779
780 if (cinfo->ds->nbuckets != 0) {
781 /* This assumes there is only one RW lseg per file.
782 * To support multiple lseg per file, we need to
783 * change struct pnfs_commit_bucket to allow dynamic
784 * increasing nbuckets.
785 */
786 return 0;
787 }
788
789 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
790
791 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
792 gfp_flags);
793 if (!buckets)
794 return -ENOMEM;
795 else {
796 int i;
797
fe238e60 798 spin_lock(&cinfo->inode->i_lock);
d67ae825
TH		 799 if (cinfo->ds->nbuckets != 0)
800 kfree(buckets);
801 else {
802 cinfo->ds->buckets = buckets;
803 cinfo->ds->nbuckets = size;
804 for (i = 0; i < size; i++) {
805 INIT_LIST_HEAD(&buckets[i].written);
806 INIT_LIST_HEAD(&buckets[i].committing);
807 /* mark direct verifier as unset */
808 buckets[i].direct_verf.committed =
809 NFS_INVALID_STABLE_HOW;
810 }
811 }
fe238e60 812 spin_unlock(&cinfo->inode->i_lock);
d67ae825
TH		 813 return 0;
814 }
815}
816
817static struct nfs4_pnfs_ds *
13544412
TM		 818ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
819 int start_idx,
d67ae825
TH		 820 int *best_idx)
821{
13544412 822 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825 823 struct nfs4_pnfs_ds *ds;
3dc14735 824 bool fail_return = false;
d67ae825
TH		 825 int idx;
826
d67ae825 827 /* mirrors are sorted by efficiency */
13544412 828 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
3dc14735
TM		 829 if (idx+1 == fls->mirror_array_cnt)
830 fail_return = true;
831 ds = nfs4_ff_layout_prepare_ds(lseg, idx, fail_return);
d67ae825
TH		 832 if (ds) {
833 *best_idx = idx;
834 return ds;
835 }
836 }
837
838 return NULL;
839}
840
c7d73af2
TH		 841static void
842ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
843 struct nfs_page *req,
844 bool strict_iomode)
845{
846retry_strict:
847 pnfs_put_lseg(pgio->pg_lseg);
848 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
849 req->wb_context,
850 0,
851 NFS4_MAX_UINT64,
852 IOMODE_READ,
853 strict_iomode,
854 GFP_KERNEL);
855 if (IS_ERR(pgio->pg_lseg)) {
856 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
857 pgio->pg_lseg = NULL;
858 }
859
860 /* If we don't have checking, do get a IOMODE_RW
861 * segment, and the server wants to avoid READs
862 * there, then retry!
863 */
864 if (pgio->pg_lseg && !strict_iomode &&
865 ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
866 strict_iomode = true;
867 goto retry_strict;
868 }
869}
870
d67ae825
TH		 871static void
872ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
873 struct nfs_page *req)
874{
875 struct nfs_pgio_mirror *pgm;
876 struct nfs4_ff_layout_mirror *mirror;
877 struct nfs4_pnfs_ds *ds;
878 int ds_idx;
879
3dc14735 880retry:
d67ae825 881 /* Use full layout for now */
c7d73af2
TH		 882 if (!pgio->pg_lseg)
883 ff_layout_pg_get_read(pgio, req, false);
884 else if (ff_layout_avoid_read_on_rw(pgio->pg_lseg))
885 ff_layout_pg_get_read(pgio, req, true);
602c4cd4 886
d67ae825
TH		 887 /* If no lseg, fall back to read through mds */
888 if (pgio->pg_lseg == NULL)
889 goto out_mds;
890
13544412 891 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
446ca219 892 if (!ds) {
3dc14735 893 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 894 goto out_mds;
3dc14735
TM		 895 pnfs_put_lseg(pgio->pg_lseg);
896 pgio->pg_lseg = NULL;
897 /* Sleep for 1 second before retrying */
898 ssleep(1);
899 goto retry;
446ca219
TH		 900 }
901
d67ae825
TH		 902 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
903
904 pgio->pg_mirror_idx = ds_idx;
905
906 /* read always uses only one mirror - idx 0 for pgio layer */
907 pgm = &pgio->pg_mirrors[0];
908 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
909
910 return;
911out_mds:
912 pnfs_put_lseg(pgio->pg_lseg);
913 pgio->pg_lseg = NULL;
914 nfs_pageio_reset_read_mds(pgio);
915}
916
917static void
918ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
919 struct nfs_page *req)
920{
921 struct nfs4_ff_layout_mirror *mirror;
922 struct nfs_pgio_mirror *pgm;
923 struct nfs_commit_info cinfo;
924 struct nfs4_pnfs_ds *ds;
925 int i;
926 int status;
927
3dc14735 928retry:
d600ad1f 929 if (!pgio->pg_lseg) {
d67ae825
TH		 930 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
931 req->wb_context,
932 0,
933 NFS4_MAX_UINT64,
934 IOMODE_RW,
c7d73af2 935 false,
d67ae825 936 GFP_NOFS);
d600ad1f
PT		 937 if (IS_ERR(pgio->pg_lseg)) {
938 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
939 pgio->pg_lseg = NULL;
940 return;
941 }
942 }
d67ae825
TH		 943 /* If no lseg, fall back to write through mds */
944 if (pgio->pg_lseg == NULL)
945 goto out_mds;
946
947 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
948 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
949 if (status < 0)
950 goto out_mds;
951
952 /* Use a direct mapping of ds_idx to pgio mirror_idx */
953 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
954 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
955 goto out_mds;
956
957 for (i = 0; i < pgio->pg_mirror_count; i++) {
958 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
446ca219 959 if (!ds) {
3dc14735 960 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 961 goto out_mds;
3dc14735
TM		 962 pnfs_put_lseg(pgio->pg_lseg);
963 pgio->pg_lseg = NULL;
964 /* Sleep for 1 second before retrying */
965 ssleep(1);
966 goto retry;
446ca219 967 }
d67ae825
TH		 968 pgm = &pgio->pg_mirrors[i];
969 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
970 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
971 }
972
973 return;
974
975out_mds:
976 pnfs_put_lseg(pgio->pg_lseg);
977 pgio->pg_lseg = NULL;
978 nfs_pageio_reset_write_mds(pgio);
979}
980
981static unsigned int
982ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
983 struct nfs_page *req)
984{
d600ad1f 985 if (!pgio->pg_lseg) {
d67ae825
TH		 986 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
987 req->wb_context,
988 0,
989 NFS4_MAX_UINT64,
990 IOMODE_RW,
c7d73af2 991 false,
d67ae825 992 GFP_NOFS);
d600ad1f
PT		 993 if (IS_ERR(pgio->pg_lseg)) {
994 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
995 pgio->pg_lseg = NULL;
996 goto out;
997 }
998 }
d67ae825
TH		 999 if (pgio->pg_lseg)
1000 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
1001
1002 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 1003 nfs_pageio_reset_write_mds(pgio);
d600ad1f 1004out:
d67ae825
TH		 1005 return 1;
1006}
1007
1008static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1009 .pg_init = ff_layout_pg_init_read,
1010 .pg_test = pnfs_generic_pg_test,
1011 .pg_doio = pnfs_generic_pg_readpages,
1012 .pg_cleanup = pnfs_generic_pg_cleanup,
1013};
1014
1015static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1016 .pg_init = ff_layout_pg_init_write,
1017 .pg_test = pnfs_generic_pg_test,
1018 .pg_doio = pnfs_generic_pg_writepages,
1019 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1020 .pg_cleanup = pnfs_generic_pg_cleanup,
1021};
1022
1023static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1024{
1025 struct rpc_task *task = &hdr->task;
1026
1027 pnfs_layoutcommit_inode(hdr->inode, false);
1028
1029 if (retry_pnfs) {
1030 dprintk("%s Reset task %5u for i/o through pNFS "
1031 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1032 hdr->task.tk_pid,
1033 hdr->inode->i_sb->s_id,
1034 (unsigned long long)NFS_FILEID(hdr->inode),
1035 hdr->args.count,
1036 (unsigned long long)hdr->args.offset);
1037
dc602dd7 1038 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1039 return;
1040 }
1041
1042 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1043 dprintk("%s Reset task %5u for i/o through MDS "
1044 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1045 hdr->task.tk_pid,
1046 hdr->inode->i_sb->s_id,
1047 (unsigned long long)NFS_FILEID(hdr->inode),
1048 hdr->args.count,
1049 (unsigned long long)hdr->args.offset);
1050
1051 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1052 }
1053}
1054
1055static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1056{
1057 struct rpc_task *task = &hdr->task;
1058
1059 pnfs_layoutcommit_inode(hdr->inode, false);
1060
1061 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1062 dprintk("%s Reset task %5u for i/o through MDS "
1063 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1064 hdr->task.tk_pid,
1065 hdr->inode->i_sb->s_id,
1066 (unsigned long long)NFS_FILEID(hdr->inode),
1067 hdr->args.count,
1068 (unsigned long long)hdr->args.offset);
1069
1070 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1071 }
1072}
1073
1074static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1075 struct nfs4_state *state,
1076 struct nfs_client *clp,
1077 struct pnfs_layout_segment *lseg,
1078 int idx)
1079{
1080 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1081 struct inode *inode = lo->plh_inode;
1082 struct nfs_server *mds_server = NFS_SERVER(inode);
1083
1084 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1085 struct nfs_client *mds_client = mds_server->nfs_client;
1086 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1087
1088 if (task->tk_status >= 0)
1089 return 0;
1090
1091 switch (task->tk_status) {
1092 /* MDS state errors */
1093 case -NFS4ERR_DELEG_REVOKED:
1094 case -NFS4ERR_ADMIN_REVOKED:
1095 case -NFS4ERR_BAD_STATEID:
1096 if (state == NULL)
1097 break;
41020b67 1098 nfs_remove_bad_delegation(state->inode, NULL);
d67ae825
TH		 1099 case -NFS4ERR_OPENMODE:
1100 if (state == NULL)
1101 break;
1102 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1103 goto out_bad_stateid;
1104 goto wait_on_recovery;
1105 case -NFS4ERR_EXPIRED:
1106 if (state != NULL) {
1107 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1108 goto out_bad_stateid;
1109 }
1110 nfs4_schedule_lease_recovery(mds_client);
1111 goto wait_on_recovery;
1112 /* DS session errors */
1113 case -NFS4ERR_BADSESSION:
1114 case -NFS4ERR_BADSLOT:
1115 case -NFS4ERR_BAD_HIGH_SLOT:
1116 case -NFS4ERR_DEADSESSION:
1117 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1118 case -NFS4ERR_SEQ_FALSE_RETRY:
1119 case -NFS4ERR_SEQ_MISORDERED:
1120 dprintk("%s ERROR %d, Reset session. Exchangeid "
1121 "flags 0x%x\n", __func__, task->tk_status,
1122 clp->cl_exchange_flags);
1123 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1124 break;
1125 case -NFS4ERR_DELAY:
1126 case -NFS4ERR_GRACE:
1127 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1128 break;
1129 case -NFS4ERR_RETRY_UNCACHED_REP:
1130 break;
1131 /* Invalidate Layout errors */
1132 case -NFS4ERR_PNFS_NO_LAYOUT:
1133 case -ESTALE: /* mapped NFS4ERR_STALE */
1134 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1135 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1136 case -NFS4ERR_FHEXPIRED:
1137 case -NFS4ERR_WRONG_TYPE:
1138 dprintk("%s Invalid layout error %d\n", __func__,
1139 task->tk_status);
1140 /*
1141 * Destroy layout so new i/o will get a new layout.
1142 * Layout will not be destroyed until all current lseg
1143 * references are put. Mark layout as invalid to resend failed
1144 * i/o and all i/o waiting on the slot table to the MDS until
1145 * layout is destroyed and a new valid layout is obtained.
1146 */
1147 pnfs_destroy_layout(NFS_I(inode));
1148 rpc_wake_up(&tbl->slot_tbl_waitq);
1149 goto reset;
1150 /* RPC connection errors */
1151 case -ECONNREFUSED:
1152 case -EHOSTDOWN:
1153 case -EHOSTUNREACH:
1154 case -ENETUNREACH:
1155 case -EIO:
1156 case -ETIMEDOUT:
1157 case -EPIPE:
1158 dprintk("%s DS connection error %d\n", __func__,
1159 task->tk_status);
1160 nfs4_mark_deviceid_unavailable(devid);
1161 rpc_wake_up(&tbl->slot_tbl_waitq);
1162 /* fall through */
1163 default:
3b13b4b3 1164 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1165 return -NFS4ERR_RESET_TO_PNFS;
1166reset:
1167 dprintk("%s Retry through MDS. Error %d\n", __func__,
1168 task->tk_status);
1169 return -NFS4ERR_RESET_TO_MDS;
1170 }
1171out:
1172 task->tk_status = 0;
1173 return -EAGAIN;
1174out_bad_stateid:
1175 task->tk_status = -EIO;
1176 return 0;
1177wait_on_recovery:
1178 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1179 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1180 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1181 goto out;
1182}
1183
1184/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1185static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1186 struct pnfs_layout_segment *lseg,
1187 int idx)
1188{
1189 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1190
1191 if (task->tk_status >= 0)
1192 return 0;
1193
90816d1d
TM		 1194 switch (task->tk_status) {
1195 /* File access problems. Don't mark the device as unavailable */
1196 case -EACCES:
1197 case -ESTALE:
1198 case -EISDIR:
1199 case -EBADHANDLE:
1200 case -ELOOP:
1201 case -ENOSPC:
1202 break;
1203 case -EJUKEBOX:
1204 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1205 goto out_retry;
1206 default:
d67ae825
TH		 1207 dprintk("%s DS connection error %d\n", __func__,
1208 task->tk_status);
1209 nfs4_mark_deviceid_unavailable(devid);
d67ae825 1210 }
90816d1d
TM		 1211 /* FIXME: Need to prevent infinite looping here. */
1212 return -NFS4ERR_RESET_TO_PNFS;
1213out_retry:
d67ae825 1214 task->tk_status = 0;
7eeea167 1215 rpc_restart_call_prepare(task);
d67ae825
TH		 1216 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1217 return -EAGAIN;
1218}
1219
1220static int ff_layout_async_handle_error(struct rpc_task *task,
1221 struct nfs4_state *state,
1222 struct nfs_client *clp,
1223 struct pnfs_layout_segment *lseg,
1224 int idx)
1225{
1226 int vers = clp->cl_nfs_mod->rpc_vers->number;
1227
1228 switch (vers) {
1229 case 3:
1230 return ff_layout_async_handle_error_v3(task, lseg, idx);
1231 case 4:
1232 return ff_layout_async_handle_error_v4(task, state, clp,
1233 lseg, idx);
1234 default:
1235 /* should never happen */
1236 WARN_ON_ONCE(1);
1237 return 0;
1238 }
1239}
1240
1241static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1242 int idx, u64 offset, u64 length,
dd52128a 1243 u32 status, int opnum, int error)
d67ae825
TH		 1244{
1245 struct nfs4_ff_layout_mirror *mirror;
1246 int err;
1247
dd52128a
TM		 1248 if (status == 0) {
1249 switch (error) {
1250 case -ETIMEDOUT:
1251 case -EPFNOSUPPORT:
1252 case -EPROTONOSUPPORT:
1253 case -EOPNOTSUPP:
1254 case -ECONNREFUSED:
1255 case -ECONNRESET:
1256 case -EHOSTDOWN:
1257 case -EHOSTUNREACH:
1258 case -ENETUNREACH:
1259 case -EADDRINUSE:
1260 case -ENOBUFS:
1261 case -EPIPE:
1262 case -EPERM:
1263 status = NFS4ERR_NXIO;
1264 break;
1265 case -EACCES:
1266 status = NFS4ERR_ACCESS;
1267 break;
1268 default:
1269 return;
1270 }
1271 }
1272
c22eeb86
PT		 1273 switch (status) {
1274 case NFS4ERR_DELAY:
1275 case NFS4ERR_GRACE:
1276 return;
1277 default:
1278 break;
1279 }
1280
d67ae825
TH		 1281 mirror = FF_LAYOUT_COMP(lseg, idx);
1282 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1283 mirror, offset, length, status, opnum,
1284 GFP_NOIO);
f95c03b2 1285 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
d67ae825
TH		 1286 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1287}
1288
1289/* NFS_PROTO call done callback routines */
d67ae825
TH		 1290static int ff_layout_read_done_cb(struct rpc_task *task,
1291 struct nfs_pgio_header *hdr)
1292{
d67ae825
TH		 1293 int err;
1294
1295 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1296 if (task->tk_status < 0)
d67ae825
TH		 1297 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1298 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1299 hdr->res.op_status, OP_READ,
1300 task->tk_status);
d67ae825
TH		 1301 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1302 hdr->ds_clp, hdr->lseg,
1303 hdr->pgio_mirror_idx);
1304
1305 switch (err) {
1306 case -NFS4ERR_RESET_TO_PNFS:
13544412
TM		 1307 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1308 hdr->pgio_mirror_idx + 1,
1309 &hdr->pgio_mirror_idx))
1310 goto out_eagain;
54e4a0df 1311 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1312 pnfs_read_resend_pnfs(hdr);
1313 return task->tk_status;
1314 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1315 ff_layout_reset_read(hdr);
1316 return task->tk_status;
1317 case -EAGAIN:
13544412 1318 goto out_eagain;
d67ae825
TH		 1319 }
1320
1321 return 0;
13544412
TM		 1322out_eagain:
1323 rpc_restart_call_prepare(task);
1324 return -EAGAIN;
d67ae825
TH		 1325}
1326
c0f5f505
TM		 1327static bool
1328ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1329{
1330 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1331}
1332
d67ae825
TH		 1333/*
1334 * We reference the rpc_cred of the first WRITE that triggers the need for
1335 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1336 * rfc5661 is not clear about which credential should be used.
1337 *
1338 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1339 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1340 * we always send layoutcommit after DS writes.
1341 */
1342static void
bc28e1c2
TM		 1343ff_layout_set_layoutcommit(struct inode *inode,
1344 struct pnfs_layout_segment *lseg,
1345 loff_t end_offset)
d67ae825 1346{
bc28e1c2 1347 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1348 return;
1349
bc28e1c2
TM		 1350 pnfs_set_layoutcommit(inode, lseg, end_offset);
1351 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1352 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1353}
1354
1355static bool
75bf47eb 1356ff_layout_device_unavailable(struct pnfs_layout_segment *lseg, int idx)
d67ae825
TH		 1357{
1358 /* No mirroring for now */
1359 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1360
1361 return ff_layout_test_devid_unavailable(node);
1362}
1363
37e9ed22
TM		 1364static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1365 struct nfs_pgio_header *hdr)
d67ae825 1366{
37e9ed22
TM		 1367 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1368 return;
0b7baf94 1369 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1370 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1371 hdr->args.count,
1372 task->tk_start);
37e9ed22
TM		 1373}
1374
1375static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1376 struct nfs_pgio_header *hdr)
1377{
1378 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1379 return;
1380 nfs4_ff_layout_stat_io_end_read(task,
1381 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1382 hdr->args.count,
1383 hdr->res.count);
1384}
abcb7bfc 1385
37e9ed22
TM		 1386static int ff_layout_read_prepare_common(struct rpc_task *task,
1387 struct nfs_pgio_header *hdr)
1388{
d67ae825
TH		 1389 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1390 rpc_exit(task, -EIO);
1391 return -EIO;
1392 }
75bf47eb
TM		 1393 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1394 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1395 return -EAGAIN;
1396 }
d67ae825 1397
37e9ed22 1398 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1399 return 0;
1400}
1401
1402/*
1403 * Call ops for the async read/write cases
1404 * In the case of dense layouts, the offset needs to be reset to its
1405 * original value.
1406 */
1407static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1408{
1409 struct nfs_pgio_header *hdr = data;
1410
1411 if (ff_layout_read_prepare_common(task, hdr))
1412 return;
1413
1414 rpc_call_start(task);
1415}
1416
1417static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1418 struct nfs4_sequence_args *args,
1419 struct nfs4_sequence_res *res,
1420 struct rpc_task *task)
1421{
1422 if (ds_clp->cl_session)
1423 return nfs41_setup_sequence(ds_clp->cl_session,
1424 args,
1425 res,
1426 task);
1427 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1428 args,
1429 res,
1430 task);
1431}
1432
1433static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1434{
1435 struct nfs_pgio_header *hdr = data;
1436
d67ae825
TH		 1437 if (ff_layout_setup_sequence(hdr->ds_clp,
1438 &hdr->args.seq_args,
1439 &hdr->res.seq_res,
1440 task))
1441 return;
1442
abcb7bfc
TM		 1443 if (ff_layout_read_prepare_common(task, hdr))
1444 return;
1445
d67ae825
TH		 1446 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1447 hdr->args.lock_context, FMODE_READ) == -EIO)
1448 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1449}
1450
1451static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1452{
1453 struct nfs_pgio_header *hdr = data;
1454
1455 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1456
1457 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1458 task->tk_status == 0) {
1459 nfs4_sequence_done(task, &hdr->res.seq_res);
1460 return;
1461 }
1462
1463 /* Note this may cause RPC to be resent */
1464 hdr->mds_ops->rpc_call_done(task, hdr);
1465}
1466
1467static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1468{
1469 struct nfs_pgio_header *hdr = data;
1470
37e9ed22 1471 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1472 rpc_count_iostats_metrics(task,
1473 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1474}
1475
4d0ac221
TM		 1476static void ff_layout_read_release(void *data)
1477{
1478 struct nfs_pgio_header *hdr = data;
1479
1480 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1481 pnfs_generic_rw_release(data);
1482}
1483
1484
d67ae825
TH		 1485static int ff_layout_write_done_cb(struct rpc_task *task,
1486 struct nfs_pgio_header *hdr)
1487{
2e18d4d8 1488 loff_t end_offs = 0;
d67ae825
TH		 1489 int err;
1490
1491 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1492 if (task->tk_status < 0)
d67ae825
TH		 1493 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1494 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1495 hdr->res.op_status, OP_WRITE,
1496 task->tk_status);
d67ae825
TH		 1497 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1498 hdr->ds_clp, hdr->lseg,
1499 hdr->pgio_mirror_idx);
1500
1501 switch (err) {
1502 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1503 ff_layout_reset_write(hdr, true);
1504 return task->tk_status;
d67ae825 1505 case -NFS4ERR_RESET_TO_MDS:
7cc8c5cd 1506 ff_layout_reset_write(hdr, false);
d67ae825
TH		 1507 return task->tk_status;
1508 case -EAGAIN:
d67ae825
TH		 1509 return -EAGAIN;
1510 }
1511
1512 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1513 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1514 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1515
1516 /* Note: if the write is unstable, don't set end_offs until commit */
1517 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1518
54204010
PT		 1519 /* zero out fattr since we don't care DS attr at all */
1520 hdr->fattr.valid = 0;
69f230d9
PT		 1521 if (task->tk_status >= 0)
1522 nfs_writeback_update_inode(hdr);
1523
d67ae825
TH		 1524 return 0;
1525}
1526
1527static int ff_layout_commit_done_cb(struct rpc_task *task,
1528 struct nfs_commit_data *data)
1529{
d67ae825
TH		 1530 int err;
1531
1532 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
dd52128a 1533 if (task->tk_status < 0)
d67ae825
TH		 1534 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1535 data->args.offset, data->args.count,
dd52128a
TM		 1536 data->res.op_status, OP_COMMIT,
1537 task->tk_status);
d67ae825
TH		 1538 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1539 data->lseg, data->ds_commit_index);
1540
1541 switch (err) {
1542 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1543 pnfs_generic_prepare_to_resend_writes(data);
1544 return -EAGAIN;
d67ae825 1545 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1546 pnfs_generic_prepare_to_resend_writes(data);
1547 return -EAGAIN;
1548 case -EAGAIN:
1549 rpc_restart_call_prepare(task);
1550 return -EAGAIN;
1551 }
1552
bc28e1c2 1553 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1554
1555 return 0;
1556}
1557
37e9ed22
TM		 1558static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1559 struct nfs_pgio_header *hdr)
d67ae825 1560{
37e9ed22
TM		 1561 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1562 return;
0b7baf94 1563 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1564 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1565 hdr->args.count,
1566 task->tk_start);
37e9ed22
TM		 1567}
1568
1569static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1570 struct nfs_pgio_header *hdr)
1571{
1572 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1573 return;
1574 nfs4_ff_layout_stat_io_end_write(task,
1575 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1576 hdr->args.count, hdr->res.count,
1577 hdr->res.verf->committed);
1578}
abcb7bfc 1579
37e9ed22
TM		 1580static int ff_layout_write_prepare_common(struct rpc_task *task,
1581 struct nfs_pgio_header *hdr)
1582{
d67ae825
TH		 1583 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1584 rpc_exit(task, -EIO);
1585 return -EIO;
1586 }
1587
75bf47eb
TM		 1588 if (ff_layout_device_unavailable(hdr->lseg, hdr->pgio_mirror_idx)) {
1589 rpc_exit(task, -EHOSTDOWN);
d67ae825
TH		 1590 return -EAGAIN;
1591 }
1592
37e9ed22 1593 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1594 return 0;
1595}
1596
1597static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1598{
1599 struct nfs_pgio_header *hdr = data;
1600
1601 if (ff_layout_write_prepare_common(task, hdr))
1602 return;
1603
1604 rpc_call_start(task);
1605}
1606
1607static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1608{
1609 struct nfs_pgio_header *hdr = data;
1610
d67ae825
TH		 1611 if (ff_layout_setup_sequence(hdr->ds_clp,
1612 &hdr->args.seq_args,
1613 &hdr->res.seq_res,
1614 task))
1615 return;
1616
abcb7bfc
TM		 1617 if (ff_layout_write_prepare_common(task, hdr))
1618 return;
1619
d67ae825
TH		 1620 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1621 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1622 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1623}
1624
1625static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1626{
1627 struct nfs_pgio_header *hdr = data;
1628
1629 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1630 task->tk_status == 0) {
1631 nfs4_sequence_done(task, &hdr->res.seq_res);
1632 return;
1633 }
1634
1635 /* Note this may cause RPC to be resent */
1636 hdr->mds_ops->rpc_call_done(task, hdr);
1637}
1638
1639static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1640{
1641 struct nfs_pgio_header *hdr = data;
1642
37e9ed22 1643 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1644 rpc_count_iostats_metrics(task,
1645 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1646}
1647
4d0ac221
TM		 1648static void ff_layout_write_release(void *data)
1649{
1650 struct nfs_pgio_header *hdr = data;
1651
1652 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1653 pnfs_generic_rw_release(data);
1654}
1655
37e9ed22 1656static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1657 struct nfs_commit_data *cdata)
1658{
37e9ed22
TM		 1659 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1660 return;
0b7baf94 1661 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1662 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1663 0, task->tk_start);
abcb7bfc
TM		 1664}
1665
37e9ed22
TM		 1666static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1667 struct nfs_commit_data *cdata)
1668{
1669 struct nfs_page *req;
1670 __u64 count = 0;
1671
1672 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1673 return;
1674
1675 if (task->tk_status == 0) {
1676 list_for_each_entry(req, &cdata->pages, wb_list)
1677 count += req->wb_bytes;
1678 }
1679 nfs4_ff_layout_stat_io_end_write(task,
1680 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1681 count, count, NFS_FILE_SYNC);
1682}
1683
1684static void ff_layout_commit_prepare_common(struct rpc_task *task,
1685 struct nfs_commit_data *cdata)
1686{
1687 ff_layout_commit_record_layoutstats_start(task, cdata);
1688}
1689
d67ae825
TH		 1690static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1691{
abcb7bfc 1692 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1693 rpc_call_start(task);
1694}
1695
1696static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1697{
1698 struct nfs_commit_data *wdata = data;
1699
abcb7bfc 1700 if (ff_layout_setup_sequence(wdata->ds_clp,
d67ae825
TH		 1701 &wdata->args.seq_args,
1702 &wdata->res.seq_res,
abcb7bfc
TM		 1703 task))
1704 return;
1705 ff_layout_commit_prepare_common(task, data);
1706}
1707
1708static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1709{
1710 pnfs_generic_write_commit_done(task, data);
1711}
1712
1713static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1714{
1715 struct nfs_commit_data *cdata = data;
abcb7bfc 1716
37e9ed22 1717 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1718 rpc_count_iostats_metrics(task,
1719 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1720}
1721
4d0ac221
TM		 1722static void ff_layout_commit_release(void *data)
1723{
1724 struct nfs_commit_data *cdata = data;
1725
1726 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1727 pnfs_generic_commit_release(data);
1728}
1729
d67ae825
TH		 1730static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1731 .rpc_call_prepare = ff_layout_read_prepare_v3,
1732 .rpc_call_done = ff_layout_read_call_done,
1733 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1734 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1735};
1736
1737static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1738 .rpc_call_prepare = ff_layout_read_prepare_v4,
1739 .rpc_call_done = ff_layout_read_call_done,
1740 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1741 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1742};
1743
1744static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1745 .rpc_call_prepare = ff_layout_write_prepare_v3,
1746 .rpc_call_done = ff_layout_write_call_done,
1747 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1748 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1749};
1750
1751static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1752 .rpc_call_prepare = ff_layout_write_prepare_v4,
1753 .rpc_call_done = ff_layout_write_call_done,
1754 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1755 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1756};
1757
1758static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1759 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1760 .rpc_call_done = ff_layout_commit_done,
d67ae825 1761 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1762 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1763};
1764
1765static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1766 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1767 .rpc_call_done = ff_layout_commit_done,
d67ae825 1768 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1769 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1770};
1771
1772static enum pnfs_try_status
1773ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1774{
1775 struct pnfs_layout_segment *lseg = hdr->lseg;
1776 struct nfs4_pnfs_ds *ds;
1777 struct rpc_clnt *ds_clnt;
1778 struct rpc_cred *ds_cred;
1779 loff_t offset = hdr->args.offset;
1780 u32 idx = hdr->pgio_mirror_idx;
1781 int vers;
1782 struct nfs_fh *fh;
1783
1784 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1785 __func__, hdr->inode->i_ino,
1786 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1787
1788 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1789 if (!ds)
1790 goto out_failed;
1791
1792 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1793 hdr->inode);
1794 if (IS_ERR(ds_clnt))
1795 goto out_failed;
1796
1797 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1798 if (!ds_cred)
d67ae825
TH		 1799 goto out_failed;
1800
1801 vers = nfs4_ff_layout_ds_version(lseg, idx);
1802
1803 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1804 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1805
75bf47eb 1806 hdr->pgio_done_cb = ff_layout_read_done_cb;
d67ae825
TH		 1807 atomic_inc(&ds->ds_clp->cl_count);
1808 hdr->ds_clp = ds->ds_clp;
1809 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1810 if (fh)
1811 hdr->args.fh = fh;
d67ae825
TH		 1812 /*
1813 * Note that if we ever decide to split across DSes,
1814 * then we may need to handle dense-like offsets.
1815 */
1816 hdr->args.offset = offset;
1817 hdr->mds_offset = offset;
1818
1819 /* Perform an asynchronous read to ds */
1820 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1821 vers == 3 ? &ff_layout_read_call_ops_v3 :
1822 &ff_layout_read_call_ops_v4,
1823 0, RPC_TASK_SOFTCONN);
57f3f4c0 1824 put_rpccred(ds_cred);
d67ae825
TH		 1825 return PNFS_ATTEMPTED;
1826
1827out_failed:
3b13b4b3 1828 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1829 return PNFS_TRY_AGAIN;
1830 return PNFS_NOT_ATTEMPTED;
1831}
1832
1833/* Perform async writes. */
1834static enum pnfs_try_status
1835ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1836{
1837 struct pnfs_layout_segment *lseg = hdr->lseg;
1838 struct nfs4_pnfs_ds *ds;
1839 struct rpc_clnt *ds_clnt;
1840 struct rpc_cred *ds_cred;
1841 loff_t offset = hdr->args.offset;
1842 int vers;
1843 struct nfs_fh *fh;
1844 int idx = hdr->pgio_mirror_idx;
1845
1846 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1847 if (!ds)
1848 return PNFS_NOT_ATTEMPTED;
1849
1850 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1851 hdr->inode);
1852 if (IS_ERR(ds_clnt))
1853 return PNFS_NOT_ATTEMPTED;
1854
1855 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1856 if (!ds_cred)
d67ae825
TH		 1857 return PNFS_NOT_ATTEMPTED;
1858
1859 vers = nfs4_ff_layout_ds_version(lseg, idx);
1860
1861 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1862 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1863 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1864 vers);
1865
1866 hdr->pgio_done_cb = ff_layout_write_done_cb;
1867 atomic_inc(&ds->ds_clp->cl_count);
1868 hdr->ds_clp = ds->ds_clp;
1869 hdr->ds_commit_idx = idx;
1870 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1871 if (fh)
1872 hdr->args.fh = fh;
1873
1874 /*
1875 * Note that if we ever decide to split across DSes,
1876 * then we may need to handle dense-like offsets.
1877 */
1878 hdr->args.offset = offset;
1879
1880 /* Perform an asynchronous write */
1881 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1882 vers == 3 ? &ff_layout_write_call_ops_v3 :
1883 &ff_layout_write_call_ops_v4,
1884 sync, RPC_TASK_SOFTCONN);
57f3f4c0 1885 put_rpccred(ds_cred);
d67ae825
TH		 1886 return PNFS_ATTEMPTED;
1887}
1888
d67ae825
TH		 1889static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1890{
1891 return i;
1892}
1893
1894static struct nfs_fh *
1895select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1896{
1897 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1898
1899 /* FIXME: Assume that there is only one NFS version available
1900 * for the DS.
1901 */
1902 return &flseg->mirror_array[i]->fh_versions[0];
1903}
1904
1905static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1906{
1907 struct pnfs_layout_segment *lseg = data->lseg;
1908 struct nfs4_pnfs_ds *ds;
1909 struct rpc_clnt *ds_clnt;
1910 struct rpc_cred *ds_cred;
1911 u32 idx;
57f3f4c0 1912 int vers, ret;
d67ae825
TH		 1913 struct nfs_fh *fh;
1914
1915 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1916 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1917 if (!ds)
1918 goto out_err;
1919
1920 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1921 data->inode);
1922 if (IS_ERR(ds_clnt))
1923 goto out_err;
1924
1925 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
57f3f4c0 1926 if (!ds_cred)
d67ae825
TH		 1927 goto out_err;
1928
1929 vers = nfs4_ff_layout_ds_version(lseg, idx);
1930
1931 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1932 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1933 vers);
1934 data->commit_done_cb = ff_layout_commit_done_cb;
1935 data->cred = ds_cred;
1936 atomic_inc(&ds->ds_clp->cl_count);
1937 data->ds_clp = ds->ds_clp;
1938 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1939 if (fh)
1940 data->args.fh = fh;
abcb7bfc 1941
57f3f4c0 1942 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1943 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1944 &ff_layout_commit_call_ops_v4,
1945 how, RPC_TASK_SOFTCONN);
57f3f4c0
JL		 1946 put_rpccred(ds_cred);
1947 return ret;
d67ae825
TH		 1948out_err:
1949 pnfs_generic_prepare_to_resend_writes(data);
1950 pnfs_generic_commit_release(data);
1951 return -EAGAIN;
1952}
1953
1954static int
1955ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1956 int how, struct nfs_commit_info *cinfo)
1957{
1958 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1959 ff_layout_initiate_commit);
1960}
1961
1962static struct pnfs_ds_commit_info *
1963ff_layout_get_ds_info(struct inode *inode)
1964{
1965 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1966
1967 if (layout == NULL)
1968 return NULL;
1969
1970 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1971}
1972
1973static void
fc87701b 1974ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1975{
1976 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1977 id_node));
1978}
1979
1980static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1981 struct xdr_stream *xdr,
5b9b3c85
TM		 1982 const struct nfs4_layoutreturn_args *args,
1983 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1984{
d67ae825 1985 __be32 *start;
d67ae825
TH		 1986
1987 start = xdr_reserve_space(xdr, 4);
1988 if (unlikely(!start))
1989 return -E2BIG;
1990
5b9b3c85 1991 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 1992 /* This assume we always return _ALL_ layouts */
5b9b3c85 1993 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 1994}
1995
230bc962
TM		 1996static void
1997encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
1998{
1999 __be32 *p;
2000
2001 p = xdr_reserve_space(xdr, len);
2002 xdr_encode_opaque_fixed(p, buf, len);
2003}
2004
2005static void
2006ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2007 const nfs4_stateid *stateid,
2008 const struct nfs42_layoutstat_devinfo *devinfo)
2009{
2010 __be32 *p;
2011
2012 p = xdr_reserve_space(xdr, 8 + 8);
2013 p = xdr_encode_hyper(p, devinfo->offset);
2014 p = xdr_encode_hyper(p, devinfo->length);
2015 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2016 p = xdr_reserve_space(xdr, 4*8);
2017 p = xdr_encode_hyper(p, devinfo->read_count);
2018 p = xdr_encode_hyper(p, devinfo->read_bytes);
2019 p = xdr_encode_hyper(p, devinfo->write_count);
2020 p = xdr_encode_hyper(p, devinfo->write_bytes);
2021 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2022}
2023
2024static void
2025ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2026 const nfs4_stateid *stateid,
2027 const struct nfs42_layoutstat_devinfo *devinfo)
2028{
2029 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2030 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2031 devinfo->ld_private.data);
2032}
2033
d67ae825 2034/* report nothing for now */
230bc962
TM		 2035static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2036 const struct nfs4_layoutreturn_args *args,
2037 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 2038{
2039 __be32 *p;
230bc962 2040 int i;
d67ae825
TH		 2041
2042 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 2043 *p = cpu_to_be32(ff_args->num_dev);
2044 for (i = 0; i < ff_args->num_dev; i++)
2045 ff_layout_encode_ff_iostat(xdr,
2046 &args->layout->plh_stateid,
2047 &ff_args->devinfo[i]);
2048}
2049
2050static void
2051ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2052 unsigned int num_entries)
2053{
2054 unsigned int i;
2055
2056 for (i = 0; i < num_entries; i++) {
2057 if (!devinfo[i].ld_private.ops)
2058 continue;
2059 if (!devinfo[i].ld_private.ops->free)
2060 continue;
2061 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2062 }
d67ae825
TH		 2063}
2064
2065static struct nfs4_deviceid_node *
2066ff_layout_alloc_deviceid_node(struct nfs_server *server,
2067 struct pnfs_device *pdev, gfp_t gfp_flags)
2068{
2069 struct nfs4_ff_layout_ds *dsaddr;
2070
2071 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2072 if (!dsaddr)
2073 return NULL;
2074 return &dsaddr->id_node;
2075}
2076
2077static void
94e5c571 2078ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2079 const void *voidargs,
2080 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2081{
5b9b3c85 2082 const struct nfs4_layoutreturn_args *args = voidargs;
94e5c571 2083 struct pnfs_layout_hdr *lo = args->layout;
d67ae825
TH		 2084 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
2085 __be32 *start;
2086
2087 dprintk("%s: Begin\n", __func__);
2088 start = xdr_reserve_space(xdr, 4);
2089 BUG_ON(!start);
2090
5b9b3c85 2091 ff_layout_encode_ioerr(flo, xdr, args, ff_opaque->data);
230bc962 2092 ff_layout_encode_iostats_array(xdr, args, ff_opaque->data);
082fa37d 2093
d67ae825
TH		 2094 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2095 dprintk("%s: Return\n", __func__);
2096}
2097
5b9b3c85
TM		 2098static void
2099ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2100{
2101 struct nfs4_flexfile_layoutreturn_args *ff_args;
2102
2103 if (!args->data)
2104 return;
2105 ff_args = args->data;
2106 args->data = NULL;
2107
2108 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2109 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85
TM		 2110
2111 kfree(ff_args);
2112}
2113
2114const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2115 .encode = ff_layout_encode_layoutreturn,
2116 .free = ff_layout_free_layoutreturn,
2117};
2118
2119static int
2120ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2121{
2122 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2123 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85
TM		 2124
2125 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2126 if (!ff_args)
2127 return -ENOMEM;
2128
2129 INIT_LIST_HEAD(&ff_args->errors);
2130 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2131 &args->range, &ff_args->errors,
2132 FF_LAYOUTRETURN_MAXERR);
2133
230bc962
TM		 2134 spin_lock(&args->inode->i_lock);
2135 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2136 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2137 spin_unlock(&args->inode->i_lock);
2138
5b9b3c85
TM		 2139 args->ld_private->ops = &layoutreturn_ops;
2140 args->ld_private->data = ff_args;
2141 return 0;
2142}
2143
27c43064
PT		 2144static int
2145ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2146{
2147 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2148
2149 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2150}
2151
2152static size_t
2153ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2154 const int buflen)
2155{
2156 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2157 const struct in6_addr *addr = &sin6->sin6_addr;
2158
2159 /*
2160 * RFC 4291, Section 2.2.2
2161 *
2162 * Shorthanded ANY address
2163 */
2164 if (ipv6_addr_any(addr))
2165 return snprintf(buf, buflen, "::");
2166
2167 /*
2168 * RFC 4291, Section 2.2.2
2169 *
2170 * Shorthanded loopback address
2171 */
2172 if (ipv6_addr_loopback(addr))
2173 return snprintf(buf, buflen, "::1");
2174
2175 /*
2176 * RFC 4291, Section 2.2.3
2177 *
2178 * Special presentation address format for mapped v4
2179 * addresses.
2180 */
2181 if (ipv6_addr_v4mapped(addr))
2182 return snprintf(buf, buflen, "::ffff:%pI4",
2183 &addr->s6_addr32[3]);
2184
2185 /*
2186 * RFC 4291, Section 2.2.1
2187 */
2188 return snprintf(buf, buflen, "%pI6c", addr);
2189}
2190
2191/* Derived from rpc_sockaddr2uaddr */
2192static void
2193ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2194{
2195 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2196 char portbuf[RPCBIND_MAXUADDRPLEN];
2197 char addrbuf[RPCBIND_MAXUADDRLEN];
2198 char *netid;
2199 unsigned short port;
2200 int len, netid_len;
2201 __be32 *p;
2202
2203 switch (sap->sa_family) {
2204 case AF_INET:
2205 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2206 return;
2207 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2208 netid = "tcp";
2209 netid_len = 3;
2210 break;
2211 case AF_INET6:
2212 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2213 return;
2214 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2215 netid = "tcp6";
2216 netid_len = 4;
2217 break;
2218 default:
2219 /* we only support tcp and tcp6 */
2220 WARN_ON_ONCE(1);
2221 return;
2222 }
2223
2224 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2225 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2226
2227 p = xdr_reserve_space(xdr, 4 + netid_len);
2228 xdr_encode_opaque(p, netid, netid_len);
2229
2230 p = xdr_reserve_space(xdr, 4 + len);
2231 xdr_encode_opaque(p, addrbuf, len);
2232}
2233
2234static void
2235ff_layout_encode_nfstime(struct xdr_stream *xdr,
2236 ktime_t t)
2237{
2238 struct timespec64 ts;
2239 __be32 *p;
2240
2241 p = xdr_reserve_space(xdr, 12);
2242 ts = ktime_to_timespec64(t);
2243 p = xdr_encode_hyper(p, ts.tv_sec);
2244 *p++ = cpu_to_be32(ts.tv_nsec);
2245}
2246
2247static void
2248ff_layout_encode_io_latency(struct xdr_stream *xdr,
2249 struct nfs4_ff_io_stat *stat)
2250{
2251 __be32 *p;
2252
2253 p = xdr_reserve_space(xdr, 5 * 8);
2254 p = xdr_encode_hyper(p, stat->ops_requested);
2255 p = xdr_encode_hyper(p, stat->bytes_requested);
2256 p = xdr_encode_hyper(p, stat->ops_completed);
2257 p = xdr_encode_hyper(p, stat->bytes_completed);
2258 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2259 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2260 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2261}
2262
2263static void
422c93c8
TM		 2264ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2265 const struct nfs42_layoutstat_devinfo *devinfo,
2266 struct nfs4_ff_layout_mirror *mirror)
27c43064 2267{
27c43064
PT		 2268 struct nfs4_pnfs_ds_addr *da;
2269 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2270 struct nfs_fh *fh = &mirror->fh_versions[0];
422c93c8 2271 __be32 *p;
27c43064
PT		 2272
2273 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2274 dprintk("%s: DS %s: encoding address %s\n",
2275 __func__, ds->ds_remotestr, da->da_remotestr);
27c43064
PT		 2276 /* netaddr4 */
2277 ff_layout_encode_netaddr(xdr, da);
2278 /* nfs_fh4 */
2279 p = xdr_reserve_space(xdr, 4 + fh->size);
2280 xdr_encode_opaque(p, fh->data, fh->size);
2281 /* ff_io_latency4 read */
2282 spin_lock(&mirror->lock);
2283 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2284 /* ff_io_latency4 write */
2285 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2286 spin_unlock(&mirror->lock);
2287 /* nfstime4 */
2288 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2289 /* bool */
2290 p = xdr_reserve_space(xdr, 4);
2291 *p = cpu_to_be32(false);
422c93c8
TM		 2292}
2293
2294static void
2295ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2296 const struct nfs4_xdr_opaque_data *opaque)
2297{
2298 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2299 struct nfs42_layoutstat_devinfo, ld_private);
2300 __be32 *start;
2301
2302 /* layoutupdate length */
2303 start = xdr_reserve_space(xdr, 4);
2304 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
27c43064
PT		 2305
2306 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2307}
2308
422c93c8
TM		 2309static void
2310ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2311{
2312 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2313
2314 ff_layout_put_mirror(mirror);
2315}
2316
2317static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2318 .encode = ff_layout_encode_layoutstats,
2319 .free = ff_layout_free_layoutstats,
2320};
2321
266d12d4 2322static int
08e2e5bc
TM		 2323ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2324 struct nfs42_layoutstat_devinfo *devinfo,
266d12d4 2325 int dev_limit)
ad4dc53e 2326{
266d12d4 2327 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2328 struct nfs4_ff_layout_mirror *mirror;
2329 struct nfs4_deviceid_node *dev;
266d12d4 2330 int i = 0;
ad4dc53e 2331
266d12d4
TM		 2332 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2333 if (i >= dev_limit)
ad4dc53e 2334 break;
266d12d4 2335 if (!mirror->mirror_ds)
27c43064 2336 continue;
06946c6a
TM		 2337 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2338 continue;
266d12d4
TM		 2339 /* mirror refcount put in cleanup_layoutstats */
2340 if (!atomic_inc_not_zero(&mirror->ref))
2341 continue;
2342 dev = &mirror->mirror_ds->id_node;
ad4dc53e 2343 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2344 devinfo->offset = 0;
2345 devinfo->length = NFS4_MAX_UINT64;
2f8220c1 2346 spin_lock(&mirror->lock);
d099d7b8 2347 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2348 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2349 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e 2350 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2f8220c1 2351 spin_unlock(&mirror->lock);
ad4dc53e 2352 devinfo->layout_type = LAYOUT_FLEX_FILES;
422c93c8
TM		 2353 devinfo->ld_private.ops = &layoutstat_ops;
2354 devinfo->ld_private.data = mirror;
ad4dc53e 2355
08e2e5bc 2356 devinfo++;
266d12d4 2357 i++;
ad4dc53e 2358 }
266d12d4 2359 return i;
ad4dc53e
PT		 2360}
2361
2362static int
2363ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2364{
266d12d4 2365 struct nfs4_flexfile_layout *ff_layout;
08e2e5bc 2366 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
ad4dc53e 2367
ad4dc53e 2368 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
266d12d4 2369 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2370 if (!args->devinfo)
2371 return -ENOMEM;
2372
ad4dc53e 2373 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2374 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2375 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2376 &args->devinfo[0], dev_count);
ad4dc53e 2377 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2378 if (!args->num_dev) {
2379 kfree(args->devinfo);
2380 args->devinfo = NULL;
2381 return -ENOENT;
2382 }
ad4dc53e
PT		 2383
2384 return 0;
2385}
2386
d67ae825
TH		 2387static struct pnfs_layoutdriver_type flexfilelayout_type = {
2388 .id = LAYOUT_FLEX_FILES,
2389 .name = "LAYOUT_FLEX_FILES",
2390 .owner = THIS_MODULE,
2391 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2392 .free_layout_hdr = ff_layout_free_layout_hdr,
2393 .alloc_lseg = ff_layout_alloc_lseg,
2394 .free_lseg = ff_layout_free_lseg,
0762ed2c 2395 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2396 .pg_read_ops = &ff_layout_pg_read_ops,
2397 .pg_write_ops = &ff_layout_pg_write_ops,
2398 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2399 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 2400 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 2401 .clear_request_commit = pnfs_generic_clear_request_commit,
2402 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2403 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2404 .commit_pagelist = ff_layout_commit_pagelist,
2405 .read_pagelist = ff_layout_read_pagelist,
2406 .write_pagelist = ff_layout_write_pagelist,
2407 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2408 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2409 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2410 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2411};
2412
2413static int __init nfs4flexfilelayout_init(void)
2414{
2415 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2416 __func__);
90a0be00
JL		 2417 if (!ff_zero_group) {
2418 ff_zero_group = groups_alloc(0);
2419 if (!ff_zero_group)
2420 return -ENOMEM;
2421 }
d67ae825
TH		 2422 return pnfs_register_layoutdriver(&flexfilelayout_type);
2423}
2424
2425static void __exit nfs4flexfilelayout_exit(void)
2426{
2427 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2428 __func__);
2429 pnfs_unregister_layoutdriver(&flexfilelayout_type);
90a0be00
JL		 2430 if (ff_zero_group) {
2431 put_group_info(ff_zero_group);
2432 ff_zero_group = NULL;
2433 }
d67ae825
TH		 2434}
2435
2436MODULE_ALIAS("nfs-layouttype4-4");
2437
2438MODULE_LICENSE("GPL");
2439MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2440
2441module_init(nfs4flexfilelayout_init);
2442module_exit(nfs4flexfilelayout_exit);
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