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NFS41: map NFS4ERR_LAYOUTUNAVAILABLE to ENODATA
[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)
28
29static struct pnfs_layout_hdr *
30ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
31{
32 struct nfs4_flexfile_layout *ffl;
33
34 ffl = kzalloc(sizeof(*ffl), gfp_flags);
35 if (ffl) {
36 INIT_LIST_HEAD(&ffl->error_list);
266d12d4 37 INIT_LIST_HEAD(&ffl->mirrors);
d67ae825
TH		 38 return &ffl->generic_hdr;
39 } else
40 return NULL;
41}
42
43static void
44ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
45{
46 struct nfs4_ff_layout_ds_err *err, *n;
47
48 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
49 list) {
50 list_del(&err->list);
51 kfree(err);
52 }
53 kfree(FF_LAYOUT_FROM_HDR(lo));
54}
55
56static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
57{
58 __be32 *p;
59
60 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
61 if (unlikely(p == NULL))
62 return -ENOBUFS;
63 memcpy(stateid, p, NFS4_STATEID_SIZE);
64 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
65 p[0], p[1], p[2], p[3]);
66 return 0;
67}
68
69static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
70{
71 __be32 *p;
72
73 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
74 if (unlikely(!p))
75 return -ENOBUFS;
76 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
77 nfs4_print_deviceid(devid);
78 return 0;
79}
80
81static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
82{
83 __be32 *p;
84
85 p = xdr_inline_decode(xdr, 4);
86 if (unlikely(!p))
87 return -ENOBUFS;
88 fh->size = be32_to_cpup(p++);
89 if (fh->size > sizeof(struct nfs_fh)) {
90 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
91 fh->size);
92 return -EOVERFLOW;
93 }
94 /* fh.data */
95 p = xdr_inline_decode(xdr, fh->size);
96 if (unlikely(!p))
97 return -ENOBUFS;
98 memcpy(&fh->data, p, fh->size);
99 dprintk("%s: fh len %d\n", __func__, fh->size);
100
101 return 0;
102}
103
104/*
105 * Currently only stringified uids and gids are accepted.
106 * I.e., kerberos is not supported to the DSes, so no pricipals.
107 *
108 * That means that one common function will suffice, but when
109 * principals are added, this should be split to accomodate
110 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
111 */
112static int
113decode_name(struct xdr_stream *xdr, u32 *id)
114{
115 __be32 *p;
116 int len;
117
118 /* opaque_length(4)*/
119 p = xdr_inline_decode(xdr, 4);
120 if (unlikely(!p))
121 return -ENOBUFS;
122 len = be32_to_cpup(p++);
123 if (len < 0)
124 return -EINVAL;
125
126 dprintk("%s: len %u\n", __func__, len);
127
128 /* opaque body */
129 p = xdr_inline_decode(xdr, len);
130 if (unlikely(!p))
131 return -ENOBUFS;
132
133 if (!nfs_map_string_to_numeric((char *)p, len, id))
134 return -EINVAL;
135
136 return 0;
137}
138
266d12d4
TM		 139static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
140 const struct nfs4_ff_layout_mirror *m2)
141{
142 int i, j;
143
144 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
145 return false;
146 for (i = 0; i < m1->fh_versions_cnt; i++) {
147 bool found_fh = false;
148 for (j = 0; j < m2->fh_versions_cnt; i++) {
149 if (nfs_compare_fh(&m1->fh_versions[i],
150 &m2->fh_versions[j]) == 0) {
151 found_fh = true;
152 break;
153 }
154 }
155 if (!found_fh)
156 return false;
157 }
158 return true;
159}
160
161static struct nfs4_ff_layout_mirror *
162ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
163 struct nfs4_ff_layout_mirror *mirror)
164{
165 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
166 struct nfs4_ff_layout_mirror *pos;
167 struct inode *inode = lo->plh_inode;
168
169 spin_lock(&inode->i_lock);
170 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
171 if (mirror->mirror_ds != pos->mirror_ds)
172 continue;
173 if (!ff_mirror_match_fh(mirror, pos))
174 continue;
175 if (atomic_inc_not_zero(&pos->ref)) {
176 spin_unlock(&inode->i_lock);
177 return pos;
178 }
179 }
180 list_add(&mirror->mirrors, &ff_layout->mirrors);
181 mirror->layout = lo;
182 spin_unlock(&inode->i_lock);
183 return mirror;
184}
185
e3b1df2d 186static void
266d12d4
TM		 187ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
188{
189 struct inode *inode;
190 if (mirror->layout == NULL)
191 return;
192 inode = mirror->layout->plh_inode;
193 spin_lock(&inode->i_lock);
194 list_del(&mirror->mirrors);
195 spin_unlock(&inode->i_lock);
196 mirror->layout = NULL;
197}
198
28a0d72c
TM		 199static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
200{
201 struct nfs4_ff_layout_mirror *mirror;
202
203 mirror = kzalloc(sizeof(*mirror), gfp_flags);
204 if (mirror != NULL) {
205 spin_lock_init(&mirror->lock);
206 atomic_set(&mirror->ref, 1);
266d12d4 207 INIT_LIST_HEAD(&mirror->mirrors);
28a0d72c
TM		 208 }
209 return mirror;
210}
211
212static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
213{
266d12d4 214 ff_layout_remove_mirror(mirror);
28a0d72c 215 kfree(mirror->fh_versions);
972398fa
TM		 216 if (mirror->cred)
217 put_rpccred(mirror->cred);
28a0d72c
TM		 218 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
219 kfree(mirror);
220}
221
222static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
223{
224 if (mirror != NULL && atomic_dec_and_test(&mirror->ref))
225 ff_layout_free_mirror(mirror);
226}
227
d67ae825
TH		 228static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
229{
230 int i;
231
232 if (fls->mirror_array) {
233 for (i = 0; i < fls->mirror_array_cnt; i++) {
234 /* normally mirror_ds is freed in
235 * .free_deviceid_node but we still do it here
236 * for .alloc_lseg error path */
28a0d72c 237 ff_layout_put_mirror(fls->mirror_array[i]);
d67ae825
TH		 238 }
239 kfree(fls->mirror_array);
240 fls->mirror_array = NULL;
241 }
242}
243
244static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
245{
246 int ret = 0;
247
248 dprintk("--> %s\n", __func__);
249
250 /* FIXME: remove this check when layout segment support is added */
251 if (lgr->range.offset != 0 ||
252 lgr->range.length != NFS4_MAX_UINT64) {
253 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
254 __func__);
255 ret = -EINVAL;
256 }
257
258 dprintk("--> %s returns %d\n", __func__, ret);
259 return ret;
260}
261
262static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
263{
264 if (fls) {
265 ff_layout_free_mirror_array(fls);
266 kfree(fls);
267 }
268}
269
0762ed2c
TM		 270static bool
271ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
272 const struct pnfs_layout_range *l2)
273{
274 u64 end1, end2;
275
276 if (l1->iomode != l2->iomode)
277 return l1->iomode != IOMODE_READ;
278 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
279 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
280 if (end1 < l2->offset)
281 return false;
282 if (end2 < l1->offset)
283 return true;
284 return l2->offset <= l1->offset;
285}
286
287static bool
288ff_lseg_merge(struct pnfs_layout_segment *new,
289 struct pnfs_layout_segment *old)
290{
291 u64 new_end, old_end;
292
293 if (new->pls_range.iomode != old->pls_range.iomode)
294 return false;
295 old_end = pnfs_calc_offset_end(old->pls_range.offset,
296 old->pls_range.length);
297 if (old_end < new->pls_range.offset)
298 return false;
299 new_end = pnfs_calc_offset_end(new->pls_range.offset,
300 new->pls_range.length);
301 if (new_end < old->pls_range.offset)
302 return false;
303
304 /* Mergeable: copy info from 'old' to 'new' */
305 if (new_end < old_end)
306 new_end = old_end;
307 if (new->pls_range.offset < old->pls_range.offset)
308 new->pls_range.offset = old->pls_range.offset;
309 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
310 new_end);
311 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
312 set_bit(NFS_LSEG_ROC, &new->pls_flags);
313 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
314 set_bit(NFS_LSEG_LAYOUTRETURN, &new->pls_flags);
315 return true;
316}
317
318static void
319ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
320 struct pnfs_layout_segment *lseg,
321 struct list_head *free_me)
322{
323 pnfs_generic_layout_insert_lseg(lo, lseg,
324 ff_lseg_range_is_after,
325 ff_lseg_merge,
326 free_me);
327}
328
d67ae825
TH		 329static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
330{
d67ae825
TH		 331 int i, j;
332
333 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
334 for (j = i + 1; j < fls->mirror_array_cnt; j++)
335 if (fls->mirror_array[i]->efficiency <
455b6ee6
FF		 336 fls->mirror_array[j]->efficiency)
337 swap(fls->mirror_array[i],
338 fls->mirror_array[j]);
d67ae825
TH		 339 }
340}
341
260074cd
TM		 342static void ff_layout_mark_devices_valid(struct nfs4_ff_layout_segment *fls)
343{
344 struct nfs4_deviceid_node *node;
345 int i;
346
347 if (!(fls->flags & FF_FLAGS_NO_IO_THRU_MDS))
348 return;
349 for (i = 0; i < fls->mirror_array_cnt; i++) {
350 node = &fls->mirror_array[i]->mirror_ds->id_node;
351 clear_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags);
352 }
353}
354
d67ae825
TH		 355static struct pnfs_layout_segment *
356ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
357 struct nfs4_layoutget_res *lgr,
358 gfp_t gfp_flags)
359{
360 struct pnfs_layout_segment *ret;
361 struct nfs4_ff_layout_segment *fls = NULL;
362 struct xdr_stream stream;
363 struct xdr_buf buf;
364 struct page *scratch;
365 u64 stripe_unit;
366 u32 mirror_array_cnt;
367 __be32 *p;
368 int i, rc;
369
370 dprintk("--> %s\n", __func__);
371 scratch = alloc_page(gfp_flags);
372 if (!scratch)
373 return ERR_PTR(-ENOMEM);
374
375 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
376 lgr->layoutp->len);
377 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
378
379 /* stripe unit and mirror_array_cnt */
380 rc = -EIO;
381 p = xdr_inline_decode(&stream, 8 + 4);
382 if (!p)
383 goto out_err_free;
384
385 p = xdr_decode_hyper(p, &stripe_unit);
386 mirror_array_cnt = be32_to_cpup(p++);
387 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
388 stripe_unit, mirror_array_cnt);
389
390 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
391 mirror_array_cnt == 0)
392 goto out_err_free;
393
394 rc = -ENOMEM;
395 fls = kzalloc(sizeof(*fls), gfp_flags);
396 if (!fls)
397 goto out_err_free;
398
399 fls->mirror_array_cnt = mirror_array_cnt;
400 fls->stripe_unit = stripe_unit;
401 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
402 sizeof(fls->mirror_array[0]), gfp_flags);
403 if (fls->mirror_array == NULL)
404 goto out_err_free;
405
406 for (i = 0; i < fls->mirror_array_cnt; i++) {
266d12d4 407 struct nfs4_ff_layout_mirror *mirror;
d67ae825
TH		 408 struct nfs4_deviceid devid;
409 struct nfs4_deviceid_node *idnode;
410 u32 ds_count;
411 u32 fh_count;
412 int j;
413
414 rc = -EIO;
415 p = xdr_inline_decode(&stream, 4);
416 if (!p)
417 goto out_err_free;
418 ds_count = be32_to_cpup(p);
419
420 /* FIXME: allow for striping? */
421 if (ds_count != 1)
422 goto out_err_free;
423
28a0d72c 424 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
d67ae825
TH		 425 if (fls->mirror_array[i] == NULL) {
426 rc = -ENOMEM;
427 goto out_err_free;
428 }
429
d67ae825
TH		 430 fls->mirror_array[i]->ds_count = ds_count;
431
432 /* deviceid */
433 rc = decode_deviceid(&stream, &devid);
434 if (rc)
435 goto out_err_free;
436
437 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
438 &devid, lh->plh_lc_cred,
439 gfp_flags);
440 /*
441 * upon success, mirror_ds is allocated by previous
442 * getdeviceinfo, or newly by .alloc_deviceid_node
443 * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
444 */
445 if (idnode)
446 fls->mirror_array[i]->mirror_ds =
447 FF_LAYOUT_MIRROR_DS(idnode);
448 else
449 goto out_err_free;
450
451 /* efficiency */
452 rc = -EIO;
453 p = xdr_inline_decode(&stream, 4);
454 if (!p)
455 goto out_err_free;
456 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
457
458 /* stateid */
459 rc = decode_stateid(&stream, &fls->mirror_array[i]->stateid);
460 if (rc)
461 goto out_err_free;
462
463 /* fh */
464 p = xdr_inline_decode(&stream, 4);
465 if (!p)
466 goto out_err_free;
467 fh_count = be32_to_cpup(p);
468
469 fls->mirror_array[i]->fh_versions =
470 kzalloc(fh_count * sizeof(struct nfs_fh),
471 gfp_flags);
472 if (fls->mirror_array[i]->fh_versions == NULL) {
473 rc = -ENOMEM;
474 goto out_err_free;
475 }
476
477 for (j = 0; j < fh_count; j++) {
478 rc = decode_nfs_fh(&stream,
479 &fls->mirror_array[i]->fh_versions[j]);
480 if (rc)
481 goto out_err_free;
482 }
483
484 fls->mirror_array[i]->fh_versions_cnt = fh_count;
485
486 /* user */
487 rc = decode_name(&stream, &fls->mirror_array[i]->uid);
488 if (rc)
489 goto out_err_free;
490
491 /* group */
492 rc = decode_name(&stream, &fls->mirror_array[i]->gid);
493 if (rc)
494 goto out_err_free;
495
266d12d4
TM		 496 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
497 if (mirror != fls->mirror_array[i]) {
498 ff_layout_free_mirror(fls->mirror_array[i]);
499 fls->mirror_array[i] = mirror;
500 }
501
d67ae825
TH		 502 dprintk("%s: uid %d gid %d\n", __func__,
503 fls->mirror_array[i]->uid,
504 fls->mirror_array[i]->gid);
505 }
506
c0f5f505 507 p = xdr_inline_decode(&stream, 4);
d0379a5d
TM		 508 if (!p)
509 goto out_sort_mirrors;
510 fls->flags = be32_to_cpup(p);
511
512 p = xdr_inline_decode(&stream, 4);
513 if (!p)
514 goto out_sort_mirrors;
515 for (i=0; i < fls->mirror_array_cnt; i++)
516 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
c0f5f505 517
d0379a5d 518out_sort_mirrors:
d67ae825
TH		 519 ff_layout_sort_mirrors(fls);
520 rc = ff_layout_check_layout(lgr);
521 if (rc)
522 goto out_err_free;
260074cd 523 ff_layout_mark_devices_valid(fls);
d67ae825
TH		 524
525 ret = &fls->generic_hdr;
526 dprintk("<-- %s (success)\n", __func__);
527out_free_page:
528 __free_page(scratch);
529 return ret;
530out_err_free:
531 _ff_layout_free_lseg(fls);
532 ret = ERR_PTR(rc);
533 dprintk("<-- %s (%d)\n", __func__, rc);
534 goto out_free_page;
535}
536
537static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
538{
539 struct pnfs_layout_segment *lseg;
540
541 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
542 if (lseg->pls_range.iomode == IOMODE_RW)
543 return true;
544
545 return false;
546}
547
548static void
549ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
550{
551 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 552
553 dprintk("--> %s\n", __func__);
554
d67ae825
TH		 555 if (lseg->pls_range.iomode == IOMODE_RW) {
556 struct nfs4_flexfile_layout *ffl;
557 struct inode *inode;
558
559 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
560 inode = ffl->generic_hdr.plh_inode;
561 spin_lock(&inode->i_lock);
562 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
563 ffl->commit_info.nbuckets = 0;
564 kfree(ffl->commit_info.buckets);
565 ffl->commit_info.buckets = NULL;
566 }
567 spin_unlock(&inode->i_lock);
568 }
569 _ff_layout_free_lseg(fls);
570}
571
572/* Return 1 until we have multiple lsegs support */
573static int
574ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
575{
576 return 1;
577}
578
abcb7bfc 579static void
e76d28dd 580nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 581{
9bbd9bb4
PT		 582 /* first IO request? */
583 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 584 timer->start_time = now;
abcb7bfc
TM		 585 }
586}
587
588static ktime_t
e76d28dd 589nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 590{
e76d28dd 591 ktime_t start;
abcb7bfc 592
9bbd9bb4
PT		 593 if (atomic_dec_return(&timer->n_ops) < 0)
594 WARN_ON_ONCE(1);
595
9bbd9bb4
PT		 596 start = timer->start_time;
597 timer->start_time = now;
abcb7bfc
TM		 598 return ktime_sub(now, start);
599}
600
97ba375b 601static bool
d983803d 602nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 603 struct nfs4_ff_layoutstat *layoutstat,
604 ktime_t now)
abcb7bfc 605{
d983803d 606 static const ktime_t notime = {0};
bbf58bf3 607 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
d983803d 608
e76d28dd 609 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
9bbd9bb4
PT		 610 if (ktime_equal(mirror->start_time, notime))
611 mirror->start_time = now;
612 if (ktime_equal(mirror->last_report_time, notime))
613 mirror->last_report_time = now;
d0379a5d
TM		 614 if (mirror->report_interval != 0)
615 report_interval = (s64)mirror->report_interval * 1000LL;
616 else if (layoutstats_timer != 0)
bbf58bf3 617 report_interval = (s64)layoutstats_timer * 1000LL;
97ba375b 618 if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >=
bbf58bf3 619 report_interval) {
97ba375b
PT		 620 mirror->last_report_time = now;
621 return true;
622 }
623
624 return false;
abcb7bfc
TM		 625}
626
627static void
628nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
629 __u64 requested)
630{
631 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
632
633 iostat->ops_requested++;
634 iostat->bytes_requested += requested;
635}
636
637static void
638nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
639 __u64 requested,
640 __u64 completed,
e76d28dd
TM		 641 ktime_t time_completed,
642 ktime_t time_started)
abcb7bfc
TM		 643{
644 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 645 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 646 ktime_t timer;
647
648 iostat->ops_completed++;
649 iostat->bytes_completed += completed;
650 iostat->bytes_not_delivered += requested - completed;
651
e76d28dd 652 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 653 iostat->total_busy_time =
654 ktime_add(iostat->total_busy_time, timer);
655 iostat->aggregate_completion_time =
e76d28dd
TM		 656 ktime_add(iostat->aggregate_completion_time,
657 completion_time);
abcb7bfc
TM		 658}
659
660static void
0b7baf94
TM		 661nfs4_ff_layout_stat_io_start_read(struct inode *inode,
662 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 663 __u64 requested, ktime_t now)
abcb7bfc 664{
97ba375b
PT		 665 bool report;
666
abcb7bfc 667 spin_lock(&mirror->lock);
e76d28dd 668 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
abcb7bfc
TM		 669 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
670 spin_unlock(&mirror->lock);
97ba375b
PT		 671
672 if (report)
0b7baf94 673 pnfs_report_layoutstat(inode, GFP_KERNEL);
abcb7bfc
TM		 674}
675
676static void
677nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
678 struct nfs4_ff_layout_mirror *mirror,
679 __u64 requested,
680 __u64 completed)
681{
682 spin_lock(&mirror->lock);
683 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
684 requested, completed,
e76d28dd 685 ktime_get(), task->tk_start);
abcb7bfc
TM		 686 spin_unlock(&mirror->lock);
687}
688
689static void
0b7baf94
TM		 690nfs4_ff_layout_stat_io_start_write(struct inode *inode,
691 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 692 __u64 requested, ktime_t now)
abcb7bfc 693{
97ba375b
PT		 694 bool report;
695
abcb7bfc 696 spin_lock(&mirror->lock);
e76d28dd 697 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc
TM		 698 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
699 spin_unlock(&mirror->lock);
97ba375b
PT		 700
701 if (report)
0b7baf94 702 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 703}
704
705static void
706nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
707 struct nfs4_ff_layout_mirror *mirror,
708 __u64 requested,
709 __u64 completed,
710 enum nfs3_stable_how committed)
711{
712 if (committed == NFS_UNSTABLE)
713 requested = completed = 0;
714
715 spin_lock(&mirror->lock);
716 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 717 requested, completed, ktime_get(), task->tk_start);
abcb7bfc
TM		 718 spin_unlock(&mirror->lock);
719}
720
d67ae825
TH		 721static int
722ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
723 struct nfs_commit_info *cinfo,
724 gfp_t gfp_flags)
725{
726 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
727 struct pnfs_commit_bucket *buckets;
728 int size;
729
730 if (cinfo->ds->nbuckets != 0) {
731 /* This assumes there is only one RW lseg per file.
732 * To support multiple lseg per file, we need to
733 * change struct pnfs_commit_bucket to allow dynamic
734 * increasing nbuckets.
735 */
736 return 0;
737 }
738
739 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
740
741 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
742 gfp_flags);
743 if (!buckets)
744 return -ENOMEM;
745 else {
746 int i;
747
748 spin_lock(cinfo->lock);
749 if (cinfo->ds->nbuckets != 0)
750 kfree(buckets);
751 else {
752 cinfo->ds->buckets = buckets;
753 cinfo->ds->nbuckets = size;
754 for (i = 0; i < size; i++) {
755 INIT_LIST_HEAD(&buckets[i].written);
756 INIT_LIST_HEAD(&buckets[i].committing);
757 /* mark direct verifier as unset */
758 buckets[i].direct_verf.committed =
759 NFS_INVALID_STABLE_HOW;
760 }
761 }
762 spin_unlock(cinfo->lock);
763 return 0;
764 }
765}
766
767static struct nfs4_pnfs_ds *
13544412
TM		 768ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
769 int start_idx,
d67ae825
TH		 770 int *best_idx)
771{
13544412 772 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 773 struct nfs4_pnfs_ds *ds;
774 int idx;
775
d67ae825 776 /* mirrors are sorted by efficiency */
13544412
TM		 777 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
778 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
d67ae825
TH		 779 if (ds) {
780 *best_idx = idx;
781 return ds;
782 }
783 }
784
785 return NULL;
786}
787
788static void
789ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
790 struct nfs_page *req)
791{
792 struct nfs_pgio_mirror *pgm;
793 struct nfs4_ff_layout_mirror *mirror;
794 struct nfs4_pnfs_ds *ds;
795 int ds_idx;
796
797 /* Use full layout for now */
d600ad1f 798 if (!pgio->pg_lseg) {
d67ae825
TH		 799 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
800 req->wb_context,
801 0,
802 NFS4_MAX_UINT64,
803 IOMODE_READ,
804 GFP_KERNEL);
d600ad1f
PT		 805 if (IS_ERR(pgio->pg_lseg)) {
806 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
807 pgio->pg_lseg = NULL;
808 return;
809 }
810 }
d67ae825
TH		 811 /* If no lseg, fall back to read through mds */
812 if (pgio->pg_lseg == NULL)
813 goto out_mds;
814
13544412 815 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
d67ae825
TH		 816 if (!ds)
817 goto out_mds;
818 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
819
820 pgio->pg_mirror_idx = ds_idx;
821
822 /* read always uses only one mirror - idx 0 for pgio layer */
823 pgm = &pgio->pg_mirrors[0];
824 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
825
826 return;
827out_mds:
828 pnfs_put_lseg(pgio->pg_lseg);
829 pgio->pg_lseg = NULL;
830 nfs_pageio_reset_read_mds(pgio);
831}
832
833static void
834ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
835 struct nfs_page *req)
836{
837 struct nfs4_ff_layout_mirror *mirror;
838 struct nfs_pgio_mirror *pgm;
839 struct nfs_commit_info cinfo;
840 struct nfs4_pnfs_ds *ds;
841 int i;
842 int status;
843
d600ad1f 844 if (!pgio->pg_lseg) {
d67ae825
TH		 845 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
846 req->wb_context,
847 0,
848 NFS4_MAX_UINT64,
849 IOMODE_RW,
850 GFP_NOFS);
d600ad1f
PT		 851 if (IS_ERR(pgio->pg_lseg)) {
852 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
853 pgio->pg_lseg = NULL;
854 return;
855 }
856 }
d67ae825
TH		 857 /* If no lseg, fall back to write through mds */
858 if (pgio->pg_lseg == NULL)
859 goto out_mds;
860
861 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
862 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
863 if (status < 0)
864 goto out_mds;
865
866 /* Use a direct mapping of ds_idx to pgio mirror_idx */
867 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
868 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
869 goto out_mds;
870
871 for (i = 0; i < pgio->pg_mirror_count; i++) {
872 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
873 if (!ds)
874 goto out_mds;
875 pgm = &pgio->pg_mirrors[i];
876 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
877 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
878 }
879
880 return;
881
882out_mds:
883 pnfs_put_lseg(pgio->pg_lseg);
884 pgio->pg_lseg = NULL;
885 nfs_pageio_reset_write_mds(pgio);
886}
887
888static unsigned int
889ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
890 struct nfs_page *req)
891{
d600ad1f 892 if (!pgio->pg_lseg) {
d67ae825
TH		 893 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
894 req->wb_context,
895 0,
896 NFS4_MAX_UINT64,
897 IOMODE_RW,
898 GFP_NOFS);
d600ad1f
PT		 899 if (IS_ERR(pgio->pg_lseg)) {
900 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
901 pgio->pg_lseg = NULL;
902 goto out;
903 }
904 }
d67ae825
TH		 905 if (pgio->pg_lseg)
906 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
907
908 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 909 nfs_pageio_reset_write_mds(pgio);
d600ad1f 910out:
d67ae825
TH		 911 return 1;
912}
913
914static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
915 .pg_init = ff_layout_pg_init_read,
916 .pg_test = pnfs_generic_pg_test,
917 .pg_doio = pnfs_generic_pg_readpages,
918 .pg_cleanup = pnfs_generic_pg_cleanup,
919};
920
921static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
922 .pg_init = ff_layout_pg_init_write,
923 .pg_test = pnfs_generic_pg_test,
924 .pg_doio = pnfs_generic_pg_writepages,
925 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
926 .pg_cleanup = pnfs_generic_pg_cleanup,
927};
928
929static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
930{
931 struct rpc_task *task = &hdr->task;
932
933 pnfs_layoutcommit_inode(hdr->inode, false);
934
935 if (retry_pnfs) {
936 dprintk("%s Reset task %5u for i/o through pNFS "
937 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
938 hdr->task.tk_pid,
939 hdr->inode->i_sb->s_id,
940 (unsigned long long)NFS_FILEID(hdr->inode),
941 hdr->args.count,
942 (unsigned long long)hdr->args.offset);
943
944 if (!hdr->dreq) {
945 struct nfs_open_context *ctx;
946
947 ctx = nfs_list_entry(hdr->pages.next)->wb_context;
948 set_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
949 hdr->completion_ops->error_cleanup(&hdr->pages);
950 } else {
951 nfs_direct_set_resched_writes(hdr->dreq);
952 /* fake unstable write to let common nfs resend pages */
953 hdr->verf.committed = NFS_UNSTABLE;
d6208769 954 hdr->good_bytes = hdr->args.count;
d67ae825
TH		 955 }
956 return;
957 }
958
959 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
960 dprintk("%s Reset task %5u for i/o through MDS "
961 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
962 hdr->task.tk_pid,
963 hdr->inode->i_sb->s_id,
964 (unsigned long long)NFS_FILEID(hdr->inode),
965 hdr->args.count,
966 (unsigned long long)hdr->args.offset);
967
968 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
969 }
970}
971
972static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
973{
974 struct rpc_task *task = &hdr->task;
975
976 pnfs_layoutcommit_inode(hdr->inode, false);
977
978 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
979 dprintk("%s Reset task %5u for i/o through MDS "
980 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
981 hdr->task.tk_pid,
982 hdr->inode->i_sb->s_id,
983 (unsigned long long)NFS_FILEID(hdr->inode),
984 hdr->args.count,
985 (unsigned long long)hdr->args.offset);
986
987 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
988 }
989}
990
991static int ff_layout_async_handle_error_v4(struct rpc_task *task,
992 struct nfs4_state *state,
993 struct nfs_client *clp,
994 struct pnfs_layout_segment *lseg,
995 int idx)
996{
997 struct pnfs_layout_hdr *lo = lseg->pls_layout;
998 struct inode *inode = lo->plh_inode;
999 struct nfs_server *mds_server = NFS_SERVER(inode);
1000
1001 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1002 struct nfs_client *mds_client = mds_server->nfs_client;
1003 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1004
1005 if (task->tk_status >= 0)
1006 return 0;
1007
1008 switch (task->tk_status) {
1009 /* MDS state errors */
1010 case -NFS4ERR_DELEG_REVOKED:
1011 case -NFS4ERR_ADMIN_REVOKED:
1012 case -NFS4ERR_BAD_STATEID:
1013 if (state == NULL)
1014 break;
1015 nfs_remove_bad_delegation(state->inode);
1016 case -NFS4ERR_OPENMODE:
1017 if (state == NULL)
1018 break;
1019 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1020 goto out_bad_stateid;
1021 goto wait_on_recovery;
1022 case -NFS4ERR_EXPIRED:
1023 if (state != NULL) {
1024 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1025 goto out_bad_stateid;
1026 }
1027 nfs4_schedule_lease_recovery(mds_client);
1028 goto wait_on_recovery;
1029 /* DS session errors */
1030 case -NFS4ERR_BADSESSION:
1031 case -NFS4ERR_BADSLOT:
1032 case -NFS4ERR_BAD_HIGH_SLOT:
1033 case -NFS4ERR_DEADSESSION:
1034 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1035 case -NFS4ERR_SEQ_FALSE_RETRY:
1036 case -NFS4ERR_SEQ_MISORDERED:
1037 dprintk("%s ERROR %d, Reset session. Exchangeid "
1038 "flags 0x%x\n", __func__, task->tk_status,
1039 clp->cl_exchange_flags);
1040 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1041 break;
1042 case -NFS4ERR_DELAY:
1043 case -NFS4ERR_GRACE:
1044 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1045 break;
1046 case -NFS4ERR_RETRY_UNCACHED_REP:
1047 break;
1048 /* Invalidate Layout errors */
1049 case -NFS4ERR_PNFS_NO_LAYOUT:
1050 case -ESTALE: /* mapped NFS4ERR_STALE */
1051 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1052 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1053 case -NFS4ERR_FHEXPIRED:
1054 case -NFS4ERR_WRONG_TYPE:
1055 dprintk("%s Invalid layout error %d\n", __func__,
1056 task->tk_status);
1057 /*
1058 * Destroy layout so new i/o will get a new layout.
1059 * Layout will not be destroyed until all current lseg
1060 * references are put. Mark layout as invalid to resend failed
1061 * i/o and all i/o waiting on the slot table to the MDS until
1062 * layout is destroyed and a new valid layout is obtained.
1063 */
1064 pnfs_destroy_layout(NFS_I(inode));
1065 rpc_wake_up(&tbl->slot_tbl_waitq);
1066 goto reset;
1067 /* RPC connection errors */
1068 case -ECONNREFUSED:
1069 case -EHOSTDOWN:
1070 case -EHOSTUNREACH:
1071 case -ENETUNREACH:
1072 case -EIO:
1073 case -ETIMEDOUT:
1074 case -EPIPE:
1075 dprintk("%s DS connection error %d\n", __func__,
1076 task->tk_status);
1077 nfs4_mark_deviceid_unavailable(devid);
1078 rpc_wake_up(&tbl->slot_tbl_waitq);
1079 /* fall through */
1080 default:
260074cd
TM		 1081 if (ff_layout_no_fallback_to_mds(lseg) ||
1082 ff_layout_has_available_ds(lseg))
d67ae825
TH		 1083 return -NFS4ERR_RESET_TO_PNFS;
1084reset:
1085 dprintk("%s Retry through MDS. Error %d\n", __func__,
1086 task->tk_status);
1087 return -NFS4ERR_RESET_TO_MDS;
1088 }
1089out:
1090 task->tk_status = 0;
1091 return -EAGAIN;
1092out_bad_stateid:
1093 task->tk_status = -EIO;
1094 return 0;
1095wait_on_recovery:
1096 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1097 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1098 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1099 goto out;
1100}
1101
1102/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1103static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1104 struct pnfs_layout_segment *lseg,
1105 int idx)
1106{
1107 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1108
1109 if (task->tk_status >= 0)
1110 return 0;
1111
90816d1d
TM		 1112 switch (task->tk_status) {
1113 /* File access problems. Don't mark the device as unavailable */
1114 case -EACCES:
1115 case -ESTALE:
1116 case -EISDIR:
1117 case -EBADHANDLE:
1118 case -ELOOP:
1119 case -ENOSPC:
1120 break;
1121 case -EJUKEBOX:
1122 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1123 goto out_retry;
1124 default:
d67ae825
TH		 1125 dprintk("%s DS connection error %d\n", __func__,
1126 task->tk_status);
1127 nfs4_mark_deviceid_unavailable(devid);
d67ae825 1128 }
90816d1d
TM		 1129 /* FIXME: Need to prevent infinite looping here. */
1130 return -NFS4ERR_RESET_TO_PNFS;
1131out_retry:
d67ae825
TH		 1132 task->tk_status = 0;
1133 rpc_restart_call(task);
1134 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1135 return -EAGAIN;
1136}
1137
1138static int ff_layout_async_handle_error(struct rpc_task *task,
1139 struct nfs4_state *state,
1140 struct nfs_client *clp,
1141 struct pnfs_layout_segment *lseg,
1142 int idx)
1143{
1144 int vers = clp->cl_nfs_mod->rpc_vers->number;
1145
1146 switch (vers) {
1147 case 3:
1148 return ff_layout_async_handle_error_v3(task, lseg, idx);
1149 case 4:
1150 return ff_layout_async_handle_error_v4(task, state, clp,
1151 lseg, idx);
1152 default:
1153 /* should never happen */
1154 WARN_ON_ONCE(1);
1155 return 0;
1156 }
1157}
1158
1159static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1160 int idx, u64 offset, u64 length,
dd52128a 1161 u32 status, int opnum, int error)
d67ae825
TH		 1162{
1163 struct nfs4_ff_layout_mirror *mirror;
1164 int err;
1165
dd52128a
TM		 1166 if (status == 0) {
1167 switch (error) {
1168 case -ETIMEDOUT:
1169 case -EPFNOSUPPORT:
1170 case -EPROTONOSUPPORT:
1171 case -EOPNOTSUPP:
1172 case -ECONNREFUSED:
1173 case -ECONNRESET:
1174 case -EHOSTDOWN:
1175 case -EHOSTUNREACH:
1176 case -ENETUNREACH:
1177 case -EADDRINUSE:
1178 case -ENOBUFS:
1179 case -EPIPE:
1180 case -EPERM:
1181 status = NFS4ERR_NXIO;
1182 break;
1183 case -EACCES:
1184 status = NFS4ERR_ACCESS;
1185 break;
1186 default:
1187 return;
1188 }
1189 }
1190
d67ae825
TH		 1191 mirror = FF_LAYOUT_COMP(lseg, idx);
1192 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1193 mirror, offset, length, status, opnum,
1194 GFP_NOIO);
f95c03b2 1195 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
d67ae825
TH		 1196 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1197}
1198
1199/* NFS_PROTO call done callback routines */
d67ae825
TH		 1200static int ff_layout_read_done_cb(struct rpc_task *task,
1201 struct nfs_pgio_header *hdr)
1202{
d67ae825
TH		 1203 int err;
1204
1205 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1206 if (task->tk_status < 0)
d67ae825
TH		 1207 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1208 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1209 hdr->res.op_status, OP_READ,
1210 task->tk_status);
d67ae825
TH		 1211 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1212 hdr->ds_clp, hdr->lseg,
1213 hdr->pgio_mirror_idx);
1214
1215 switch (err) {
1216 case -NFS4ERR_RESET_TO_PNFS:
13544412
TM		 1217 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1218 hdr->pgio_mirror_idx + 1,
1219 &hdr->pgio_mirror_idx))
1220 goto out_eagain;
d67ae825
TH		 1221 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1222 &hdr->lseg->pls_layout->plh_flags);
1223 pnfs_read_resend_pnfs(hdr);
1224 return task->tk_status;
1225 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1226 ff_layout_reset_read(hdr);
1227 return task->tk_status;
1228 case -EAGAIN:
13544412 1229 goto out_eagain;
d67ae825
TH		 1230 }
1231
1232 return 0;
13544412
TM		 1233out_eagain:
1234 rpc_restart_call_prepare(task);
1235 return -EAGAIN;
d67ae825
TH		 1236}
1237
c0f5f505
TM		 1238static bool
1239ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1240{
1241 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1242}
1243
d67ae825
TH		 1244/*
1245 * We reference the rpc_cred of the first WRITE that triggers the need for
1246 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1247 * rfc5661 is not clear about which credential should be used.
1248 *
1249 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1250 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1251 * we always send layoutcommit after DS writes.
1252 */
1253static void
1254ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
1255{
c0f5f505
TM		 1256 if (!ff_layout_need_layoutcommit(hdr->lseg))
1257 return;
1258
67af7611
TM		 1259 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1260 hdr->mds_offset + hdr->res.count);
d67ae825
TH		 1261 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
1262 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
1263}
1264
1265static bool
1266ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx)
1267{
1268 /* No mirroring for now */
1269 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1270
1271 return ff_layout_test_devid_unavailable(node);
1272}
1273
1274static int ff_layout_read_prepare_common(struct rpc_task *task,
1275 struct nfs_pgio_header *hdr)
1276{
0b7baf94 1277 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1278 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1279 hdr->args.count,
1280 task->tk_start);
abcb7bfc 1281
d67ae825
TH		 1282 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1283 rpc_exit(task, -EIO);
1284 return -EIO;
1285 }
1286 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1287 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
1288 if (ff_layout_has_available_ds(hdr->lseg))
1289 pnfs_read_resend_pnfs(hdr);
1290 else
1291 ff_layout_reset_read(hdr);
1292 rpc_exit(task, 0);
1293 return -EAGAIN;
1294 }
1295 hdr->pgio_done_cb = ff_layout_read_done_cb;
1296
1297 return 0;
1298}
1299
1300/*
1301 * Call ops for the async read/write cases
1302 * In the case of dense layouts, the offset needs to be reset to its
1303 * original value.
1304 */
1305static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1306{
1307 struct nfs_pgio_header *hdr = data;
1308
1309 if (ff_layout_read_prepare_common(task, hdr))
1310 return;
1311
1312 rpc_call_start(task);
1313}
1314
1315static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1316 struct nfs4_sequence_args *args,
1317 struct nfs4_sequence_res *res,
1318 struct rpc_task *task)
1319{
1320 if (ds_clp->cl_session)
1321 return nfs41_setup_sequence(ds_clp->cl_session,
1322 args,
1323 res,
1324 task);
1325 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1326 args,
1327 res,
1328 task);
1329}
1330
1331static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1332{
1333 struct nfs_pgio_header *hdr = data;
1334
d67ae825
TH		 1335 if (ff_layout_setup_sequence(hdr->ds_clp,
1336 &hdr->args.seq_args,
1337 &hdr->res.seq_res,
1338 task))
1339 return;
1340
abcb7bfc
TM		 1341 if (ff_layout_read_prepare_common(task, hdr))
1342 return;
1343
d67ae825
TH		 1344 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1345 hdr->args.lock_context, FMODE_READ) == -EIO)
1346 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1347}
1348
1349static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1350{
1351 struct nfs_pgio_header *hdr = data;
1352
1353 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1354
abcb7bfc
TM		 1355 nfs4_ff_layout_stat_io_end_read(task,
1356 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1357 hdr->args.count, hdr->res.count);
1358
d67ae825
TH		 1359 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1360 task->tk_status == 0) {
1361 nfs4_sequence_done(task, &hdr->res.seq_res);
1362 return;
1363 }
1364
1365 /* Note this may cause RPC to be resent */
1366 hdr->mds_ops->rpc_call_done(task, hdr);
1367}
1368
1369static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1370{
1371 struct nfs_pgio_header *hdr = data;
1372
1373 rpc_count_iostats_metrics(task,
1374 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1375}
1376
1377static int ff_layout_write_done_cb(struct rpc_task *task,
1378 struct nfs_pgio_header *hdr)
1379{
d67ae825
TH		 1380 int err;
1381
1382 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1383 if (task->tk_status < 0)
d67ae825
TH		 1384 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1385 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1386 hdr->res.op_status, OP_WRITE,
1387 task->tk_status);
d67ae825
TH		 1388 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1389 hdr->ds_clp, hdr->lseg,
1390 hdr->pgio_mirror_idx);
1391
1392 switch (err) {
1393 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1394 pnfs_set_retry_layoutget(hdr->lseg->pls_layout);
1395 ff_layout_reset_write(hdr, true);
1396 return task->tk_status;
d67ae825 1397 case -NFS4ERR_RESET_TO_MDS:
7cc8c5cd
TM		 1398 pnfs_clear_retry_layoutget(hdr->lseg->pls_layout);
1399 ff_layout_reset_write(hdr, false);
d67ae825
TH		 1400 return task->tk_status;
1401 case -EAGAIN:
1402 rpc_restart_call_prepare(task);
1403 return -EAGAIN;
1404 }
1405
1406 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1407 hdr->res.verf->committed == NFS_DATA_SYNC)
1408 ff_layout_set_layoutcommit(hdr);
1409
54204010
PT		 1410 /* zero out fattr since we don't care DS attr at all */
1411 hdr->fattr.valid = 0;
69f230d9
PT		 1412 if (task->tk_status >= 0)
1413 nfs_writeback_update_inode(hdr);
1414
d67ae825
TH		 1415 return 0;
1416}
1417
1418static int ff_layout_commit_done_cb(struct rpc_task *task,
1419 struct nfs_commit_data *data)
1420{
d67ae825
TH		 1421 int err;
1422
1423 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
dd52128a 1424 if (task->tk_status < 0)
d67ae825
TH		 1425 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1426 data->args.offset, data->args.count,
dd52128a
TM		 1427 data->res.op_status, OP_COMMIT,
1428 task->tk_status);
d67ae825
TH		 1429 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1430 data->lseg, data->ds_commit_index);
1431
1432 switch (err) {
1433 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1434 pnfs_set_retry_layoutget(data->lseg->pls_layout);
1435 pnfs_generic_prepare_to_resend_writes(data);
1436 return -EAGAIN;
d67ae825 1437 case -NFS4ERR_RESET_TO_MDS:
7cc8c5cd 1438 pnfs_clear_retry_layoutget(data->lseg->pls_layout);
d67ae825
TH		 1439 pnfs_generic_prepare_to_resend_writes(data);
1440 return -EAGAIN;
1441 case -EAGAIN:
1442 rpc_restart_call_prepare(task);
1443 return -EAGAIN;
1444 }
1445
c0f5f505
TM		 1446 if (data->verf.committed == NFS_UNSTABLE
1447 && ff_layout_need_layoutcommit(data->lseg))
67af7611 1448 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1449
1450 return 0;
1451}
1452
1453static int ff_layout_write_prepare_common(struct rpc_task *task,
1454 struct nfs_pgio_header *hdr)
1455{
0b7baf94 1456 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1457 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1458 hdr->args.count,
1459 task->tk_start);
abcb7bfc 1460
d67ae825
TH		 1461 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1462 rpc_exit(task, -EIO);
1463 return -EIO;
1464 }
1465
1466 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1467 bool retry_pnfs;
1468
1469 retry_pnfs = ff_layout_has_available_ds(hdr->lseg);
1470 dprintk("%s task %u reset io to %s\n", __func__,
1471 task->tk_pid, retry_pnfs ? "pNFS" : "MDS");
1472 ff_layout_reset_write(hdr, retry_pnfs);
1473 rpc_exit(task, 0);
1474 return -EAGAIN;
1475 }
1476
1477 return 0;
1478}
1479
1480static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1481{
1482 struct nfs_pgio_header *hdr = data;
1483
1484 if (ff_layout_write_prepare_common(task, hdr))
1485 return;
1486
1487 rpc_call_start(task);
1488}
1489
1490static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1491{
1492 struct nfs_pgio_header *hdr = data;
1493
d67ae825
TH		 1494 if (ff_layout_setup_sequence(hdr->ds_clp,
1495 &hdr->args.seq_args,
1496 &hdr->res.seq_res,
1497 task))
1498 return;
1499
abcb7bfc
TM		 1500 if (ff_layout_write_prepare_common(task, hdr))
1501 return;
1502
d67ae825
TH		 1503 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1504 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1505 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1506}
1507
1508static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1509{
1510 struct nfs_pgio_header *hdr = data;
1511
abcb7bfc
TM		 1512 nfs4_ff_layout_stat_io_end_write(task,
1513 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1514 hdr->args.count, hdr->res.count,
1515 hdr->res.verf->committed);
1516
d67ae825
TH		 1517 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1518 task->tk_status == 0) {
1519 nfs4_sequence_done(task, &hdr->res.seq_res);
1520 return;
1521 }
1522
1523 /* Note this may cause RPC to be resent */
1524 hdr->mds_ops->rpc_call_done(task, hdr);
1525}
1526
1527static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1528{
1529 struct nfs_pgio_header *hdr = data;
1530
1531 rpc_count_iostats_metrics(task,
1532 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1533}
1534
abcb7bfc
TM		 1535static void ff_layout_commit_prepare_common(struct rpc_task *task,
1536 struct nfs_commit_data *cdata)
1537{
0b7baf94 1538 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1539 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1540 0, task->tk_start);
abcb7bfc
TM		 1541}
1542
d67ae825
TH		 1543static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1544{
abcb7bfc 1545 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1546 rpc_call_start(task);
1547}
1548
1549static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1550{
1551 struct nfs_commit_data *wdata = data;
1552
abcb7bfc 1553 if (ff_layout_setup_sequence(wdata->ds_clp,
d67ae825
TH		 1554 &wdata->args.seq_args,
1555 &wdata->res.seq_res,
abcb7bfc
TM		 1556 task))
1557 return;
1558 ff_layout_commit_prepare_common(task, data);
1559}
1560
1561static void ff_layout_commit_done(struct rpc_task *task, void *data)
1562{
1563 struct nfs_commit_data *cdata = data;
1564 struct nfs_page *req;
1565 __u64 count = 0;
1566
1567 if (task->tk_status == 0) {
1568 list_for_each_entry(req, &cdata->pages, wb_list)
1569 count += req->wb_bytes;
1570 }
1571
1572 nfs4_ff_layout_stat_io_end_write(task,
1573 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1574 count, count, NFS_FILE_SYNC);
1575
1576 pnfs_generic_write_commit_done(task, data);
d67ae825
TH		 1577}
1578
1579static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1580{
1581 struct nfs_commit_data *cdata = data;
1582
1583 rpc_count_iostats_metrics(task,
1584 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1585}
1586
1587static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1588 .rpc_call_prepare = ff_layout_read_prepare_v3,
1589 .rpc_call_done = ff_layout_read_call_done,
1590 .rpc_count_stats = ff_layout_read_count_stats,
1591 .rpc_release = pnfs_generic_rw_release,
1592};
1593
1594static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1595 .rpc_call_prepare = ff_layout_read_prepare_v4,
1596 .rpc_call_done = ff_layout_read_call_done,
1597 .rpc_count_stats = ff_layout_read_count_stats,
1598 .rpc_release = pnfs_generic_rw_release,
1599};
1600
1601static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1602 .rpc_call_prepare = ff_layout_write_prepare_v3,
1603 .rpc_call_done = ff_layout_write_call_done,
1604 .rpc_count_stats = ff_layout_write_count_stats,
1605 .rpc_release = pnfs_generic_rw_release,
1606};
1607
1608static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1609 .rpc_call_prepare = ff_layout_write_prepare_v4,
1610 .rpc_call_done = ff_layout_write_call_done,
1611 .rpc_count_stats = ff_layout_write_count_stats,
1612 .rpc_release = pnfs_generic_rw_release,
1613};
1614
1615static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1616 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1617 .rpc_call_done = ff_layout_commit_done,
d67ae825
TH		 1618 .rpc_count_stats = ff_layout_commit_count_stats,
1619 .rpc_release = pnfs_generic_commit_release,
1620};
1621
1622static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1623 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1624 .rpc_call_done = ff_layout_commit_done,
d67ae825
TH		 1625 .rpc_count_stats = ff_layout_commit_count_stats,
1626 .rpc_release = pnfs_generic_commit_release,
1627};
1628
1629static enum pnfs_try_status
1630ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1631{
1632 struct pnfs_layout_segment *lseg = hdr->lseg;
1633 struct nfs4_pnfs_ds *ds;
1634 struct rpc_clnt *ds_clnt;
1635 struct rpc_cred *ds_cred;
1636 loff_t offset = hdr->args.offset;
1637 u32 idx = hdr->pgio_mirror_idx;
1638 int vers;
1639 struct nfs_fh *fh;
1640
1641 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1642 __func__, hdr->inode->i_ino,
1643 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1644
1645 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1646 if (!ds)
1647 goto out_failed;
1648
1649 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1650 hdr->inode);
1651 if (IS_ERR(ds_clnt))
1652 goto out_failed;
1653
1654 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1655 if (IS_ERR(ds_cred))
1656 goto out_failed;
1657
1658 vers = nfs4_ff_layout_ds_version(lseg, idx);
1659
1660 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1661 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1662
1663 atomic_inc(&ds->ds_clp->cl_count);
1664 hdr->ds_clp = ds->ds_clp;
1665 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1666 if (fh)
1667 hdr->args.fh = fh;
d67ae825
TH		 1668 /*
1669 * Note that if we ever decide to split across DSes,
1670 * then we may need to handle dense-like offsets.
1671 */
1672 hdr->args.offset = offset;
1673 hdr->mds_offset = offset;
1674
1675 /* Perform an asynchronous read to ds */
1676 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1677 vers == 3 ? &ff_layout_read_call_ops_v3 :
1678 &ff_layout_read_call_ops_v4,
1679 0, RPC_TASK_SOFTCONN);
1680
1681 return PNFS_ATTEMPTED;
1682
1683out_failed:
1684 if (ff_layout_has_available_ds(lseg))
1685 return PNFS_TRY_AGAIN;
1686 return PNFS_NOT_ATTEMPTED;
1687}
1688
1689/* Perform async writes. */
1690static enum pnfs_try_status
1691ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1692{
1693 struct pnfs_layout_segment *lseg = hdr->lseg;
1694 struct nfs4_pnfs_ds *ds;
1695 struct rpc_clnt *ds_clnt;
1696 struct rpc_cred *ds_cred;
1697 loff_t offset = hdr->args.offset;
1698 int vers;
1699 struct nfs_fh *fh;
1700 int idx = hdr->pgio_mirror_idx;
1701
1702 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1703 if (!ds)
1704 return PNFS_NOT_ATTEMPTED;
1705
1706 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1707 hdr->inode);
1708 if (IS_ERR(ds_clnt))
1709 return PNFS_NOT_ATTEMPTED;
1710
1711 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1712 if (IS_ERR(ds_cred))
1713 return PNFS_NOT_ATTEMPTED;
1714
1715 vers = nfs4_ff_layout_ds_version(lseg, idx);
1716
1717 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1718 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1719 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1720 vers);
1721
1722 hdr->pgio_done_cb = ff_layout_write_done_cb;
1723 atomic_inc(&ds->ds_clp->cl_count);
1724 hdr->ds_clp = ds->ds_clp;
1725 hdr->ds_commit_idx = idx;
1726 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1727 if (fh)
1728 hdr->args.fh = fh;
1729
1730 /*
1731 * Note that if we ever decide to split across DSes,
1732 * then we may need to handle dense-like offsets.
1733 */
1734 hdr->args.offset = offset;
1735
1736 /* Perform an asynchronous write */
1737 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1738 vers == 3 ? &ff_layout_write_call_ops_v3 :
1739 &ff_layout_write_call_ops_v4,
1740 sync, RPC_TASK_SOFTCONN);
1741 return PNFS_ATTEMPTED;
1742}
1743
d67ae825
TH		 1744static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1745{
1746 return i;
1747}
1748
1749static struct nfs_fh *
1750select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1751{
1752 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1753
1754 /* FIXME: Assume that there is only one NFS version available
1755 * for the DS.
1756 */
1757 return &flseg->mirror_array[i]->fh_versions[0];
1758}
1759
1760static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1761{
1762 struct pnfs_layout_segment *lseg = data->lseg;
1763 struct nfs4_pnfs_ds *ds;
1764 struct rpc_clnt *ds_clnt;
1765 struct rpc_cred *ds_cred;
1766 u32 idx;
1767 int vers;
1768 struct nfs_fh *fh;
1769
1770 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1771 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1772 if (!ds)
1773 goto out_err;
1774
1775 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1776 data->inode);
1777 if (IS_ERR(ds_clnt))
1778 goto out_err;
1779
1780 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1781 if (IS_ERR(ds_cred))
1782 goto out_err;
1783
1784 vers = nfs4_ff_layout_ds_version(lseg, idx);
1785
1786 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1787 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1788 vers);
1789 data->commit_done_cb = ff_layout_commit_done_cb;
1790 data->cred = ds_cred;
1791 atomic_inc(&ds->ds_clp->cl_count);
1792 data->ds_clp = ds->ds_clp;
1793 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1794 if (fh)
1795 data->args.fh = fh;
abcb7bfc 1796
d67ae825
TH		 1797 return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1798 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1799 &ff_layout_commit_call_ops_v4,
1800 how, RPC_TASK_SOFTCONN);
1801out_err:
1802 pnfs_generic_prepare_to_resend_writes(data);
1803 pnfs_generic_commit_release(data);
1804 return -EAGAIN;
1805}
1806
1807static int
1808ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1809 int how, struct nfs_commit_info *cinfo)
1810{
1811 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1812 ff_layout_initiate_commit);
1813}
1814
1815static struct pnfs_ds_commit_info *
1816ff_layout_get_ds_info(struct inode *inode)
1817{
1818 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1819
1820 if (layout == NULL)
1821 return NULL;
1822
1823 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1824}
1825
1826static void
fc87701b 1827ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1828{
1829 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1830 id_node));
1831}
1832
1833static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1834 struct xdr_stream *xdr,
1835 const struct nfs4_layoutreturn_args *args)
1836{
1837 struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
1838 __be32 *start;
1839 int count = 0, ret = 0;
1840
1841 start = xdr_reserve_space(xdr, 4);
1842 if (unlikely(!start))
1843 return -E2BIG;
1844
1845 /* This assume we always return _ALL_ layouts */
1846 spin_lock(&hdr->plh_inode->i_lock);
1847 ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
1848 spin_unlock(&hdr->plh_inode->i_lock);
1849
1850 *start = cpu_to_be32(count);
1851
1852 return ret;
1853}
1854
1855/* report nothing for now */
1856static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1857 struct xdr_stream *xdr,
1858 const struct nfs4_layoutreturn_args *args)
1859{
1860 __be32 *p;
1861
1862 p = xdr_reserve_space(xdr, 4);
1863 if (likely(p))
1864 *p = cpu_to_be32(0);
1865}
1866
1867static struct nfs4_deviceid_node *
1868ff_layout_alloc_deviceid_node(struct nfs_server *server,
1869 struct pnfs_device *pdev, gfp_t gfp_flags)
1870{
1871 struct nfs4_ff_layout_ds *dsaddr;
1872
1873 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
1874 if (!dsaddr)
1875 return NULL;
1876 return &dsaddr->id_node;
1877}
1878
1879static void
1880ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
1881 struct xdr_stream *xdr,
1882 const struct nfs4_layoutreturn_args *args)
1883{
1884 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
1885 __be32 *start;
1886
1887 dprintk("%s: Begin\n", __func__);
1888 start = xdr_reserve_space(xdr, 4);
1889 BUG_ON(!start);
1890
1891 if (ff_layout_encode_ioerr(flo, xdr, args))
1892 goto out;
1893
1894 ff_layout_encode_iostats(flo, xdr, args);
1895out:
1896 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1897 dprintk("%s: Return\n", __func__);
1898}
1899
27c43064
PT		 1900static int
1901ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
1902{
1903 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
1904
1905 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
1906}
1907
1908static size_t
1909ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
1910 const int buflen)
1911{
1912 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
1913 const struct in6_addr *addr = &sin6->sin6_addr;
1914
1915 /*
1916 * RFC 4291, Section 2.2.2
1917 *
1918 * Shorthanded ANY address
1919 */
1920 if (ipv6_addr_any(addr))
1921 return snprintf(buf, buflen, "::");
1922
1923 /*
1924 * RFC 4291, Section 2.2.2
1925 *
1926 * Shorthanded loopback address
1927 */
1928 if (ipv6_addr_loopback(addr))
1929 return snprintf(buf, buflen, "::1");
1930
1931 /*
1932 * RFC 4291, Section 2.2.3
1933 *
1934 * Special presentation address format for mapped v4
1935 * addresses.
1936 */
1937 if (ipv6_addr_v4mapped(addr))
1938 return snprintf(buf, buflen, "::ffff:%pI4",
1939 &addr->s6_addr32[3]);
1940
1941 /*
1942 * RFC 4291, Section 2.2.1
1943 */
1944 return snprintf(buf, buflen, "%pI6c", addr);
1945}
1946
1947/* Derived from rpc_sockaddr2uaddr */
1948static void
1949ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
1950{
1951 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
1952 char portbuf[RPCBIND_MAXUADDRPLEN];
1953 char addrbuf[RPCBIND_MAXUADDRLEN];
1954 char *netid;
1955 unsigned short port;
1956 int len, netid_len;
1957 __be32 *p;
1958
1959 switch (sap->sa_family) {
1960 case AF_INET:
1961 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
1962 return;
1963 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1964 netid = "tcp";
1965 netid_len = 3;
1966 break;
1967 case AF_INET6:
1968 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
1969 return;
1970 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
1971 netid = "tcp6";
1972 netid_len = 4;
1973 break;
1974 default:
1975 /* we only support tcp and tcp6 */
1976 WARN_ON_ONCE(1);
1977 return;
1978 }
1979
1980 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
1981 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
1982
1983 p = xdr_reserve_space(xdr, 4 + netid_len);
1984 xdr_encode_opaque(p, netid, netid_len);
1985
1986 p = xdr_reserve_space(xdr, 4 + len);
1987 xdr_encode_opaque(p, addrbuf, len);
1988}
1989
1990static void
1991ff_layout_encode_nfstime(struct xdr_stream *xdr,
1992 ktime_t t)
1993{
1994 struct timespec64 ts;
1995 __be32 *p;
1996
1997 p = xdr_reserve_space(xdr, 12);
1998 ts = ktime_to_timespec64(t);
1999 p = xdr_encode_hyper(p, ts.tv_sec);
2000 *p++ = cpu_to_be32(ts.tv_nsec);
2001}
2002
2003static void
2004ff_layout_encode_io_latency(struct xdr_stream *xdr,
2005 struct nfs4_ff_io_stat *stat)
2006{
2007 __be32 *p;
2008
2009 p = xdr_reserve_space(xdr, 5 * 8);
2010 p = xdr_encode_hyper(p, stat->ops_requested);
2011 p = xdr_encode_hyper(p, stat->bytes_requested);
2012 p = xdr_encode_hyper(p, stat->ops_completed);
2013 p = xdr_encode_hyper(p, stat->bytes_completed);
2014 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2015 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2016 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2017}
2018
2019static void
2020ff_layout_encode_layoutstats(struct xdr_stream *xdr,
2021 struct nfs42_layoutstat_args *args,
2022 struct nfs42_layoutstat_devinfo *devinfo)
2023{
2024 struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private;
2025 struct nfs4_pnfs_ds_addr *da;
2026 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2027 struct nfs_fh *fh = &mirror->fh_versions[0];
2028 __be32 *p, *start;
2029
2030 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2031 dprintk("%s: DS %s: encoding address %s\n",
2032 __func__, ds->ds_remotestr, da->da_remotestr);
2033 /* layoutupdate length */
2034 start = xdr_reserve_space(xdr, 4);
2035 /* netaddr4 */
2036 ff_layout_encode_netaddr(xdr, da);
2037 /* nfs_fh4 */
2038 p = xdr_reserve_space(xdr, 4 + fh->size);
2039 xdr_encode_opaque(p, fh->data, fh->size);
2040 /* ff_io_latency4 read */
2041 spin_lock(&mirror->lock);
2042 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2043 /* ff_io_latency4 write */
2044 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2045 spin_unlock(&mirror->lock);
2046 /* nfstime4 */
2047 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2048 /* bool */
2049 p = xdr_reserve_space(xdr, 4);
2050 *p = cpu_to_be32(false);
2051
2052 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2053}
2054
266d12d4 2055static int
ad4dc53e 2056ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
266d12d4
TM		 2057 struct pnfs_layout_hdr *lo,
2058 int dev_limit)
ad4dc53e 2059{
266d12d4 2060 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2061 struct nfs4_ff_layout_mirror *mirror;
2062 struct nfs4_deviceid_node *dev;
2063 struct nfs42_layoutstat_devinfo *devinfo;
266d12d4 2064 int i = 0;
ad4dc53e 2065
266d12d4
TM		 2066 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2067 if (i >= dev_limit)
ad4dc53e 2068 break;
266d12d4 2069 if (!mirror->mirror_ds)
27c43064 2070 continue;
266d12d4
TM		 2071 /* mirror refcount put in cleanup_layoutstats */
2072 if (!atomic_inc_not_zero(&mirror->ref))
2073 continue;
2074 dev = &mirror->mirror_ds->id_node;
2075 devinfo = &args->devinfo[i];
ad4dc53e 2076 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2077 devinfo->offset = 0;
2078 devinfo->length = NFS4_MAX_UINT64;
d099d7b8 2079 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2080 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2081 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e
PT		 2082 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2083 devinfo->layout_type = LAYOUT_FLEX_FILES;
27c43064
PT		 2084 devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
2085 devinfo->layout_private = mirror;
ad4dc53e 2086
266d12d4 2087 i++;
ad4dc53e 2088 }
266d12d4 2089 return i;
ad4dc53e
PT		 2090}
2091
2092static int
2093ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2094{
266d12d4
TM		 2095 struct nfs4_flexfile_layout *ff_layout;
2096 struct nfs4_ff_layout_mirror *mirror;
ad4dc53e
PT		 2097 int dev_count = 0;
2098
2099 spin_lock(&args->inode->i_lock);
266d12d4
TM		 2100 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2101 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2102 if (atomic_read(&mirror->ref) != 0)
2103 dev_count ++;
ad4dc53e
PT		 2104 }
2105 spin_unlock(&args->inode->i_lock);
2106 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2107 if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
2108 dprintk("%s: truncating devinfo to limit (%d:%d)\n",
2109 __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
2110 dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2111 }
266d12d4 2112 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2113 if (!args->devinfo)
2114 return -ENOMEM;
2115
ad4dc53e 2116 spin_lock(&args->inode->i_lock);
266d12d4
TM		 2117 args->num_dev = ff_layout_mirror_prepare_stats(args,
2118 &ff_layout->generic_hdr, dev_count);
ad4dc53e 2119 spin_unlock(&args->inode->i_lock);
ad4dc53e
PT		 2120
2121 return 0;
2122}
2123
27c43064
PT		 2124static void
2125ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data)
2126{
2127 struct nfs4_ff_layout_mirror *mirror;
2128 int i;
2129
2130 for (i = 0; i < data->args.num_dev; i++) {
2131 mirror = data->args.devinfo[i].layout_private;
2132 data->args.devinfo[i].layout_private = NULL;
0b7baf94 2133 ff_layout_put_mirror(mirror);
27c43064
PT		 2134 }
2135}
2136
d67ae825
TH		 2137static struct pnfs_layoutdriver_type flexfilelayout_type = {
2138 .id = LAYOUT_FLEX_FILES,
2139 .name = "LAYOUT_FLEX_FILES",
2140 .owner = THIS_MODULE,
2141 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2142 .free_layout_hdr = ff_layout_free_layout_hdr,
2143 .alloc_lseg = ff_layout_alloc_lseg,
2144 .free_lseg = ff_layout_free_lseg,
0762ed2c 2145 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2146 .pg_read_ops = &ff_layout_pg_read_ops,
2147 .pg_write_ops = &ff_layout_pg_write_ops,
2148 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2149 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 2150 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 2151 .clear_request_commit = pnfs_generic_clear_request_commit,
2152 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2153 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2154 .commit_pagelist = ff_layout_commit_pagelist,
2155 .read_pagelist = ff_layout_read_pagelist,
2156 .write_pagelist = ff_layout_write_pagelist,
2157 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2158 .encode_layoutreturn = ff_layout_encode_layoutreturn,
5bb89b47 2159 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2160 .prepare_layoutstats = ff_layout_prepare_layoutstats,
27c43064 2161 .cleanup_layoutstats = ff_layout_cleanup_layoutstats,
d67ae825
TH		 2162};
2163
2164static int __init nfs4flexfilelayout_init(void)
2165{
2166 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2167 __func__);
2168 return pnfs_register_layoutdriver(&flexfilelayout_type);
2169}
2170
2171static void __exit nfs4flexfilelayout_exit(void)
2172{
2173 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2174 __func__);
2175 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2176}
2177
2178MODULE_ALIAS("nfs-layouttype4-4");
2179
2180MODULE_LICENSE("GPL");
2181MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2182
2183module_init(nfs4flexfilelayout_init);
2184module_exit(nfs4flexfilelayout_exit);
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