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accel/qaic: Add AIC200 support
[drm/drm-misc.git] / fs / nfs / flexfilelayout / flexfilelayout.c
blobf78115c6c2c12a9b6ebd4fb2072f0e1281fa5523
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Module for pnfs flexfile layout driver.
4 *
5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6 *
7 * Tao Peng <bergwolf@primarydata.com>
8 */
9
10 #include <linux/nfs_fs.h>
11 #include <linux/nfs_mount.h>
12 #include <linux/nfs_page.h>
13 #include <linux/module.h>
14 #include <linux/file.h>
15 #include <linux/sched/mm.h>
16
17 #include <linux/sunrpc/metrics.h>
18
19 #include "flexfilelayout.h"
20 #include "../nfs4session.h"
21 #include "../nfs4idmap.h"
22 #include "../internal.h"
23 #include "../delegation.h"
24 #include "../nfs4trace.h"
25 #include "../iostat.h"
26 #include "../nfs.h"
27 #include "../nfs42.h"
28
29 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
30
31 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
32 #define FF_LAYOUTRETURN_MAXERR 20
33
34 enum nfs4_ff_op_type {
35 NFS4_FF_OP_LAYOUTSTATS,
36 NFS4_FF_OP_LAYOUTRETURN,
37 };
38
39 static unsigned short io_maxretrans;
40
41 static const struct pnfs_commit_ops ff_layout_commit_ops;
42 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
43 struct nfs_pgio_header *hdr);
44 static int
45 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
46 struct nfs42_layoutstat_devinfo *devinfo,
47 int dev_limit, enum nfs4_ff_op_type type);
48 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
49 const struct nfs42_layoutstat_devinfo *devinfo,
50 struct nfs4_ff_layout_mirror *mirror);
51
52 static struct pnfs_layout_hdr *
53 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
54 {
55 struct nfs4_flexfile_layout *ffl;
56
57 ffl = kzalloc(sizeof(*ffl), gfp_flags);
58 if (ffl) {
59 pnfs_init_ds_commit_info(&ffl->commit_info);
60 INIT_LIST_HEAD(&ffl->error_list);
61 INIT_LIST_HEAD(&ffl->mirrors);
62 ffl->last_report_time = ktime_get();
63 ffl->commit_info.ops = &ff_layout_commit_ops;
64 return &ffl->generic_hdr;
65 } else
66 return NULL;
67 }
68
69 static void
70 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
71 {
72 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
73 struct nfs4_ff_layout_ds_err *err, *n;
74
75 list_for_each_entry_safe(err, n, &ffl->error_list, list) {
76 list_del(&err->list);
77 kfree(err);
78 }
79 kfree_rcu(ffl, generic_hdr.plh_rcu);
80 }
81
82 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
83 {
84 __be32 *p;
85
86 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
87 if (unlikely(p == NULL))
88 return -ENOBUFS;
89 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
90 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
91 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
92 p[0], p[1], p[2], p[3]);
93 return 0;
94 }
95
96 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
97 {
98 __be32 *p;
99
100 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
101 if (unlikely(!p))
102 return -ENOBUFS;
103 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
104 nfs4_print_deviceid(devid);
105 return 0;
106 }
107
108 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
109 {
110 __be32 *p;
111
112 p = xdr_inline_decode(xdr, 4);
113 if (unlikely(!p))
114 return -ENOBUFS;
115 fh->size = be32_to_cpup(p++);
116 if (fh->size > NFS_MAXFHSIZE) {
117 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
118 fh->size);
119 return -EOVERFLOW;
120 }
121 /* fh.data */
122 p = xdr_inline_decode(xdr, fh->size);
123 if (unlikely(!p))
124 return -ENOBUFS;
125 memcpy(&fh->data, p, fh->size);
126 dprintk("%s: fh len %d\n", __func__, fh->size);
127
128 return 0;
129 }
130
131 /*
132 * Currently only stringified uids and gids are accepted.
133 * I.e., kerberos is not supported to the DSes, so no pricipals.
134 *
135 * That means that one common function will suffice, but when
136 * principals are added, this should be split to accomodate
137 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
138 */
139 static int
140 decode_name(struct xdr_stream *xdr, u32 *id)
141 {
142 __be32 *p;
143 int len;
144
145 /* opaque_length(4)*/
146 p = xdr_inline_decode(xdr, 4);
147 if (unlikely(!p))
148 return -ENOBUFS;
149 len = be32_to_cpup(p++);
150 if (len < 0)
151 return -EINVAL;
152
153 dprintk("%s: len %u\n", __func__, len);
154
155 /* opaque body */
156 p = xdr_inline_decode(xdr, len);
157 if (unlikely(!p))
158 return -ENOBUFS;
159
160 if (!nfs_map_string_to_numeric((char *)p, len, id))
161 return -EINVAL;
162
163 return 0;
164 }
165
166 static struct nfsd_file *
167 ff_local_open_fh(struct nfs_client *clp, const struct cred *cred,
168 struct nfs_fh *fh, fmode_t mode)
169 {
170 if (mode & FMODE_WRITE) {
171 /*
172 * Always request read and write access since this corresponds
173 * to a rw layout.
174 */
175 mode |= FMODE_READ;
176 }
177
178 return nfs_local_open_fh(clp, cred, fh, mode);
179 }
180
181 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
182 const struct nfs4_ff_layout_mirror *m2)
183 {
184 int i, j;
185
186 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
187 return false;
188 for (i = 0; i < m1->fh_versions_cnt; i++) {
189 bool found_fh = false;
190 for (j = 0; j < m2->fh_versions_cnt; j++) {
191 if (nfs_compare_fh(&m1->fh_versions[i],
192 &m2->fh_versions[j]) == 0) {
193 found_fh = true;
194 break;
195 }
196 }
197 if (!found_fh)
198 return false;
199 }
200 return true;
201 }
202
203 static struct nfs4_ff_layout_mirror *
204 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
205 struct nfs4_ff_layout_mirror *mirror)
206 {
207 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
208 struct nfs4_ff_layout_mirror *pos;
209 struct inode *inode = lo->plh_inode;
210
211 spin_lock(&inode->i_lock);
212 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
213 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
214 continue;
215 if (!ff_mirror_match_fh(mirror, pos))
216 continue;
217 if (refcount_inc_not_zero(&pos->ref)) {
218 spin_unlock(&inode->i_lock);
219 return pos;
220 }
221 }
222 list_add(&mirror->mirrors, &ff_layout->mirrors);
223 mirror->layout = lo;
224 spin_unlock(&inode->i_lock);
225 return mirror;
226 }
227
228 static void
229 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
230 {
231 struct inode *inode;
232 if (mirror->layout == NULL)
233 return;
234 inode = mirror->layout->plh_inode;
235 spin_lock(&inode->i_lock);
236 list_del(&mirror->mirrors);
237 spin_unlock(&inode->i_lock);
238 mirror->layout = NULL;
239 }
240
241 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
242 {
243 struct nfs4_ff_layout_mirror *mirror;
244
245 mirror = kzalloc(sizeof(*mirror), gfp_flags);
246 if (mirror != NULL) {
247 spin_lock_init(&mirror->lock);
248 refcount_set(&mirror->ref, 1);
249 INIT_LIST_HEAD(&mirror->mirrors);
250 }
251 return mirror;
252 }
253
254 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
255 {
256 const struct cred *cred;
257
258 ff_layout_remove_mirror(mirror);
259 kfree(mirror->fh_versions);
260 cred = rcu_access_pointer(mirror->ro_cred);
261 put_cred(cred);
262 cred = rcu_access_pointer(mirror->rw_cred);
263 put_cred(cred);
264 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
265 kfree(mirror);
266 }
267
268 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
269 {
270 if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
271 ff_layout_free_mirror(mirror);
272 }
273
274 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
275 {
276 u32 i;
277
278 for (i = 0; i < fls->mirror_array_cnt; i++)
279 ff_layout_put_mirror(fls->mirror_array[i]);
280 }
281
282 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
283 {
284 if (fls) {
285 ff_layout_free_mirror_array(fls);
286 kfree(fls);
287 }
288 }
289
290 static bool
291 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
292 struct pnfs_layout_segment *l2)
293 {
294 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
295 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
296 u32 i;
297
298 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
299 return false;
300 for (i = 0; i < fl1->mirror_array_cnt; i++) {
301 if (fl1->mirror_array[i] != fl2->mirror_array[i])
302 return false;
303 }
304 return true;
305 }
306
307 static bool
308 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
309 const struct pnfs_layout_range *l2)
310 {
311 u64 end1, end2;
312
313 if (l1->iomode != l2->iomode)
314 return l1->iomode != IOMODE_READ;
315 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
316 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
317 if (end1 < l2->offset)
318 return false;
319 if (end2 < l1->offset)
320 return true;
321 return l2->offset <= l1->offset;
322 }
323
324 static bool
325 ff_lseg_merge(struct pnfs_layout_segment *new,
326 struct pnfs_layout_segment *old)
327 {
328 u64 new_end, old_end;
329
330 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
331 return false;
332 if (new->pls_range.iomode != old->pls_range.iomode)
333 return false;
334 old_end = pnfs_calc_offset_end(old->pls_range.offset,
335 old->pls_range.length);
336 if (old_end < new->pls_range.offset)
337 return false;
338 new_end = pnfs_calc_offset_end(new->pls_range.offset,
339 new->pls_range.length);
340 if (new_end < old->pls_range.offset)
341 return false;
342 if (!ff_lseg_match_mirrors(new, old))
343 return false;
344
345 /* Mergeable: copy info from 'old' to 'new' */
346 if (new_end < old_end)
347 new_end = old_end;
348 if (new->pls_range.offset < old->pls_range.offset)
349 new->pls_range.offset = old->pls_range.offset;
350 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
351 new_end);
352 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
353 set_bit(NFS_LSEG_ROC, &new->pls_flags);
354 return true;
355 }
356
357 static void
358 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
359 struct pnfs_layout_segment *lseg,
360 struct list_head *free_me)
361 {
362 pnfs_generic_layout_insert_lseg(lo, lseg,
363 ff_lseg_range_is_after,
364 ff_lseg_merge,
365 free_me);
366 }
367
368 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
369 {
370 int i, j;
371
372 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
373 for (j = i + 1; j < fls->mirror_array_cnt; j++)
374 if (fls->mirror_array[i]->efficiency <
375 fls->mirror_array[j]->efficiency)
376 swap(fls->mirror_array[i],
377 fls->mirror_array[j]);
378 }
379 }
380
381 static struct pnfs_layout_segment *
382 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
383 struct nfs4_layoutget_res *lgr,
384 gfp_t gfp_flags)
385 {
386 struct pnfs_layout_segment *ret;
387 struct nfs4_ff_layout_segment *fls = NULL;
388 struct xdr_stream stream;
389 struct xdr_buf buf;
390 struct page *scratch;
391 u64 stripe_unit;
392 u32 mirror_array_cnt;
393 __be32 *p;
394 int i, rc;
395
396 dprintk("--> %s\n", __func__);
397 scratch = alloc_page(gfp_flags);
398 if (!scratch)
399 return ERR_PTR(-ENOMEM);
400
401 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
402 lgr->layoutp->len);
403 xdr_set_scratch_page(&stream, scratch);
404
405 /* stripe unit and mirror_array_cnt */
406 rc = -EIO;
407 p = xdr_inline_decode(&stream, 8 + 4);
408 if (!p)
409 goto out_err_free;
410
411 p = xdr_decode_hyper(p, &stripe_unit);
412 mirror_array_cnt = be32_to_cpup(p++);
413 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
414 stripe_unit, mirror_array_cnt);
415
416 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
417 mirror_array_cnt == 0)
418 goto out_err_free;
419
420 rc = -ENOMEM;
421 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt),
422 gfp_flags);
423 if (!fls)
424 goto out_err_free;
425
426 fls->mirror_array_cnt = mirror_array_cnt;
427 fls->stripe_unit = stripe_unit;
428
429 for (i = 0; i < fls->mirror_array_cnt; i++) {
430 struct nfs4_ff_layout_mirror *mirror;
431 struct cred *kcred;
432 const struct cred __rcu *cred;
433 kuid_t uid;
434 kgid_t gid;
435 u32 ds_count, fh_count, id;
436 int j;
437
438 rc = -EIO;
439 p = xdr_inline_decode(&stream, 4);
440 if (!p)
441 goto out_err_free;
442 ds_count = be32_to_cpup(p);
443
444 /* FIXME: allow for striping? */
445 if (ds_count != 1)
446 goto out_err_free;
447
448 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
449 if (fls->mirror_array[i] == NULL) {
450 rc = -ENOMEM;
451 goto out_err_free;
452 }
453
454 fls->mirror_array[i]->ds_count = ds_count;
455
456 /* deviceid */
457 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
458 if (rc)
459 goto out_err_free;
460
461 /* efficiency */
462 rc = -EIO;
463 p = xdr_inline_decode(&stream, 4);
464 if (!p)
465 goto out_err_free;
466 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
467
468 /* stateid */
469 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
470 if (rc)
471 goto out_err_free;
472
473 /* fh */
474 rc = -EIO;
475 p = xdr_inline_decode(&stream, 4);
476 if (!p)
477 goto out_err_free;
478 fh_count = be32_to_cpup(p);
479
480 fls->mirror_array[i]->fh_versions =
481 kcalloc(fh_count, sizeof(struct nfs_fh),
482 gfp_flags);
483 if (fls->mirror_array[i]->fh_versions == NULL) {
484 rc = -ENOMEM;
485 goto out_err_free;
486 }
487
488 for (j = 0; j < fh_count; j++) {
489 rc = decode_nfs_fh(&stream,
490 &fls->mirror_array[i]->fh_versions[j]);
491 if (rc)
492 goto out_err_free;
493 }
494
495 fls->mirror_array[i]->fh_versions_cnt = fh_count;
496
497 /* user */
498 rc = decode_name(&stream, &id);
499 if (rc)
500 goto out_err_free;
501
502 uid = make_kuid(&init_user_ns, id);
503
504 /* group */
505 rc = decode_name(&stream, &id);
506 if (rc)
507 goto out_err_free;
508
509 gid = make_kgid(&init_user_ns, id);
510
511 if (gfp_flags & __GFP_FS)
512 kcred = prepare_kernel_cred(&init_task);
513 else {
514 unsigned int nofs_flags = memalloc_nofs_save();
515 kcred = prepare_kernel_cred(&init_task);
516 memalloc_nofs_restore(nofs_flags);
517 }
518 rc = -ENOMEM;
519 if (!kcred)
520 goto out_err_free;
521 kcred->fsuid = uid;
522 kcred->fsgid = gid;
523 cred = RCU_INITIALIZER(kcred);
524
525 if (lgr->range.iomode == IOMODE_READ)
526 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
527 else
528 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
529
530 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
531 if (mirror != fls->mirror_array[i]) {
532 /* swap cred ptrs so free_mirror will clean up old */
533 if (lgr->range.iomode == IOMODE_READ) {
534 cred = xchg(&mirror->ro_cred, cred);
535 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
536 } else {
537 cred = xchg(&mirror->rw_cred, cred);
538 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
539 }
540 ff_layout_free_mirror(fls->mirror_array[i]);
541 fls->mirror_array[i] = mirror;
542 }
543
544 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
545 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
546 from_kuid(&init_user_ns, uid),
547 from_kgid(&init_user_ns, gid));
548 }
549
550 p = xdr_inline_decode(&stream, 4);
551 if (!p)
552 goto out_sort_mirrors;
553 fls->flags = be32_to_cpup(p);
554
555 p = xdr_inline_decode(&stream, 4);
556 if (!p)
557 goto out_sort_mirrors;
558 for (i=0; i < fls->mirror_array_cnt; i++)
559 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
560
561 out_sort_mirrors:
562 ff_layout_sort_mirrors(fls);
563 ret = &fls->generic_hdr;
564 dprintk("<-- %s (success)\n", __func__);
565 out_free_page:
566 __free_page(scratch);
567 return ret;
568 out_err_free:
569 _ff_layout_free_lseg(fls);
570 ret = ERR_PTR(rc);
571 dprintk("<-- %s (%d)\n", __func__, rc);
572 goto out_free_page;
573 }
574
575 static void
576 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
577 {
578 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
579
580 dprintk("--> %s\n", __func__);
581
582 if (lseg->pls_range.iomode == IOMODE_RW) {
583 struct nfs4_flexfile_layout *ffl;
584 struct inode *inode;
585
586 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
587 inode = ffl->generic_hdr.plh_inode;
588 spin_lock(&inode->i_lock);
589 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
590 spin_unlock(&inode->i_lock);
591 }
592 _ff_layout_free_lseg(fls);
593 }
594
595 static void
596 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
597 {
598 /* first IO request? */
599 if (atomic_inc_return(&timer->n_ops) == 1) {
600 timer->start_time = now;
601 }
602 }
603
604 static ktime_t
605 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
606 {
607 ktime_t start;
608
609 if (atomic_dec_return(&timer->n_ops) < 0)
610 WARN_ON_ONCE(1);
611
612 start = timer->start_time;
613 timer->start_time = now;
614 return ktime_sub(now, start);
615 }
616
617 static bool
618 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
619 struct nfs4_ff_layoutstat *layoutstat,
620 ktime_t now)
621 {
622 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
623 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
624
625 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
626 if (!mirror->start_time)
627 mirror->start_time = now;
628 if (mirror->report_interval != 0)
629 report_interval = (s64)mirror->report_interval * 1000LL;
630 else if (layoutstats_timer != 0)
631 report_interval = (s64)layoutstats_timer * 1000LL;
632 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
633 report_interval) {
634 ffl->last_report_time = now;
635 return true;
636 }
637
638 return false;
639 }
640
641 static void
642 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
643 __u64 requested)
644 {
645 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
646
647 iostat->ops_requested++;
648 iostat->bytes_requested += requested;
649 }
650
651 static void
652 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
653 __u64 requested,
654 __u64 completed,
655 ktime_t time_completed,
656 ktime_t time_started)
657 {
658 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
659 ktime_t completion_time = ktime_sub(time_completed, time_started);
660 ktime_t timer;
661
662 iostat->ops_completed++;
663 iostat->bytes_completed += completed;
664 iostat->bytes_not_delivered += requested - completed;
665
666 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
667 iostat->total_busy_time =
668 ktime_add(iostat->total_busy_time, timer);
669 iostat->aggregate_completion_time =
670 ktime_add(iostat->aggregate_completion_time,
671 completion_time);
672 }
673
674 static void
675 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
676 struct nfs4_ff_layout_mirror *mirror,
677 __u64 requested, ktime_t now)
678 {
679 bool report;
680
681 spin_lock(&mirror->lock);
682 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
683 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
684 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
685 spin_unlock(&mirror->lock);
686
687 if (report)
688 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
689 }
690
691 static void
692 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
693 struct nfs4_ff_layout_mirror *mirror,
694 __u64 requested,
695 __u64 completed)
696 {
697 spin_lock(&mirror->lock);
698 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
699 requested, completed,
700 ktime_get(), task->tk_start);
701 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
702 spin_unlock(&mirror->lock);
703 }
704
705 static void
706 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
707 struct nfs4_ff_layout_mirror *mirror,
708 __u64 requested, ktime_t now)
709 {
710 bool report;
711
712 spin_lock(&mirror->lock);
713 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
714 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
715 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
716 spin_unlock(&mirror->lock);
717
718 if (report)
719 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
720 }
721
722 static void
723 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
724 struct nfs4_ff_layout_mirror *mirror,
725 __u64 requested,
726 __u64 completed,
727 enum nfs3_stable_how committed)
728 {
729 if (committed == NFS_UNSTABLE)
730 requested = completed = 0;
731
732 spin_lock(&mirror->lock);
733 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
734 requested, completed, ktime_get(), task->tk_start);
735 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
736 spin_unlock(&mirror->lock);
737 }
738
739 static void
740 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx)
741 {
742 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
743
744 if (devid)
745 nfs4_mark_deviceid_unavailable(devid);
746 }
747
748 static void
749 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
750 {
751 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
752
753 if (devid)
754 nfs4_mark_deviceid_available(devid);
755 }
756
757 static struct nfs4_pnfs_ds *
758 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
759 u32 start_idx, u32 *best_idx,
760 bool check_device)
761 {
762 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
763 struct nfs4_ff_layout_mirror *mirror;
764 struct nfs4_pnfs_ds *ds;
765 u32 idx;
766
767 /* mirrors are initially sorted by efficiency */
768 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
769 mirror = FF_LAYOUT_COMP(lseg, idx);
770 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
771 if (!ds)
772 continue;
773
774 if (check_device &&
775 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
776 continue;
777
778 *best_idx = idx;
779 return ds;
780 }
781
782 return NULL;
783 }
784
785 static struct nfs4_pnfs_ds *
786 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
787 u32 start_idx, u32 *best_idx)
788 {
789 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
790 }
791
792 static struct nfs4_pnfs_ds *
793 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
794 u32 start_idx, u32 *best_idx)
795 {
796 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
797 }
798
799 static struct nfs4_pnfs_ds *
800 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
801 u32 start_idx, u32 *best_idx)
802 {
803 struct nfs4_pnfs_ds *ds;
804
805 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
806 if (ds)
807 return ds;
808 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
809 }
810
811 static struct nfs4_pnfs_ds *
812 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
813 u32 *best_idx)
814 {
815 struct pnfs_layout_segment *lseg = pgio->pg_lseg;
816 struct nfs4_pnfs_ds *ds;
817
818 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
819 best_idx);
820 if (ds || !pgio->pg_mirror_idx)
821 return ds;
822 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
823 }
824
825 static void
826 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
827 struct nfs_page *req,
828 bool strict_iomode)
829 {
830 pnfs_put_lseg(pgio->pg_lseg);
831 pgio->pg_lseg =
832 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
833 req_offset(req), req->wb_bytes, IOMODE_READ,
834 strict_iomode, nfs_io_gfp_mask());
835 if (IS_ERR(pgio->pg_lseg)) {
836 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
837 pgio->pg_lseg = NULL;
838 }
839 }
840
841 static void
842 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
843 struct nfs_page *req)
844 {
845 struct nfs_pgio_mirror *pgm;
846 struct nfs4_ff_layout_mirror *mirror;
847 struct nfs4_pnfs_ds *ds;
848 u32 ds_idx;
849
850 retry:
851 pnfs_generic_pg_check_layout(pgio, req);
852 /* Use full layout for now */
853 if (!pgio->pg_lseg) {
854 ff_layout_pg_get_read(pgio, req, false);
855 if (!pgio->pg_lseg)
856 goto out_nolseg;
857 }
858 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
859 ff_layout_pg_get_read(pgio, req, true);
860 if (!pgio->pg_lseg)
861 goto out_nolseg;
862 }
863
864 ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
865 if (!ds) {
866 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
867 goto out_mds;
868 pnfs_generic_pg_cleanup(pgio);
869 /* Sleep for 1 second before retrying */
870 ssleep(1);
871 goto retry;
872 }
873
874 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
875 pgm = &pgio->pg_mirrors[0];
876 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
877
878 pgio->pg_mirror_idx = ds_idx;
879
880 if (NFS_SERVER(pgio->pg_inode)->flags &
881 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
882 pgio->pg_maxretrans = io_maxretrans;
883 return;
884 out_nolseg:
885 if (pgio->pg_error < 0)
886 return;
887 out_mds:
888 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
889 0, NFS4_MAX_UINT64, IOMODE_READ,
890 NFS_I(pgio->pg_inode)->layout,
891 pgio->pg_lseg);
892 pgio->pg_maxretrans = 0;
893 nfs_pageio_reset_read_mds(pgio);
894 }
895
896 static void
897 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
898 struct nfs_page *req)
899 {
900 struct nfs4_ff_layout_mirror *mirror;
901 struct nfs_pgio_mirror *pgm;
902 struct nfs4_pnfs_ds *ds;
903 u32 i;
904
905 retry:
906 pnfs_generic_pg_check_layout(pgio, req);
907 if (!pgio->pg_lseg) {
908 pgio->pg_lseg =
909 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
910 req_offset(req), req->wb_bytes,
911 IOMODE_RW, false, nfs_io_gfp_mask());
912 if (IS_ERR(pgio->pg_lseg)) {
913 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
914 pgio->pg_lseg = NULL;
915 return;
916 }
917 }
918 /* If no lseg, fall back to write through mds */
919 if (pgio->pg_lseg == NULL)
920 goto out_mds;
921
922 /* Use a direct mapping of ds_idx to pgio mirror_idx */
923 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
924 goto out_eagain;
925
926 for (i = 0; i < pgio->pg_mirror_count; i++) {
927 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
928 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
929 if (!ds) {
930 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
931 goto out_mds;
932 pnfs_generic_pg_cleanup(pgio);
933 /* Sleep for 1 second before retrying */
934 ssleep(1);
935 goto retry;
936 }
937 pgm = &pgio->pg_mirrors[i];
938 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
939 }
940
941 if (NFS_SERVER(pgio->pg_inode)->flags &
942 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
943 pgio->pg_maxretrans = io_maxretrans;
944 return;
945 out_eagain:
946 pnfs_generic_pg_cleanup(pgio);
947 pgio->pg_error = -EAGAIN;
948 return;
949 out_mds:
950 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
951 0, NFS4_MAX_UINT64, IOMODE_RW,
952 NFS_I(pgio->pg_inode)->layout,
953 pgio->pg_lseg);
954 pgio->pg_maxretrans = 0;
955 nfs_pageio_reset_write_mds(pgio);
956 pgio->pg_error = -EAGAIN;
957 }
958
959 static unsigned int
960 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
961 struct nfs_page *req)
962 {
963 if (!pgio->pg_lseg) {
964 pgio->pg_lseg =
965 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
966 req_offset(req), req->wb_bytes,
967 IOMODE_RW, false, nfs_io_gfp_mask());
968 if (IS_ERR(pgio->pg_lseg)) {
969 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
970 pgio->pg_lseg = NULL;
971 goto out;
972 }
973 }
974 if (pgio->pg_lseg)
975 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
976
977 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
978 0, NFS4_MAX_UINT64, IOMODE_RW,
979 NFS_I(pgio->pg_inode)->layout,
980 pgio->pg_lseg);
981 /* no lseg means that pnfs is not in use, so no mirroring here */
982 nfs_pageio_reset_write_mds(pgio);
983 out:
984 return 1;
985 }
986
987 static u32
988 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
989 {
990 u32 old = desc->pg_mirror_idx;
991
992 desc->pg_mirror_idx = idx;
993 return old;
994 }
995
996 static struct nfs_pgio_mirror *
997 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
998 {
999 return &desc->pg_mirrors[idx];
1000 }
1001
1002 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1003 .pg_init = ff_layout_pg_init_read,
1004 .pg_test = pnfs_generic_pg_test,
1005 .pg_doio = pnfs_generic_pg_readpages,
1006 .pg_cleanup = pnfs_generic_pg_cleanup,
1007 };
1008
1009 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1010 .pg_init = ff_layout_pg_init_write,
1011 .pg_test = pnfs_generic_pg_test,
1012 .pg_doio = pnfs_generic_pg_writepages,
1013 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1014 .pg_cleanup = pnfs_generic_pg_cleanup,
1015 .pg_get_mirror = ff_layout_pg_get_mirror_write,
1016 .pg_set_mirror = ff_layout_pg_set_mirror_write,
1017 };
1018
1019 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1020 {
1021 struct rpc_task *task = &hdr->task;
1022
1023 pnfs_layoutcommit_inode(hdr->inode, false);
1024
1025 if (retry_pnfs) {
1026 dprintk("%s Reset task %5u for i/o through pNFS "
1027 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1028 hdr->task.tk_pid,
1029 hdr->inode->i_sb->s_id,
1030 (unsigned long long)NFS_FILEID(hdr->inode),
1031 hdr->args.count,
1032 (unsigned long long)hdr->args.offset);
1033
1034 hdr->completion_ops->reschedule_io(hdr);
1035 return;
1036 }
1037
1038 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1039 dprintk("%s Reset task %5u for i/o through MDS "
1040 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1041 hdr->task.tk_pid,
1042 hdr->inode->i_sb->s_id,
1043 (unsigned long long)NFS_FILEID(hdr->inode),
1044 hdr->args.count,
1045 (unsigned long long)hdr->args.offset);
1046
1047 trace_pnfs_mds_fallback_write_done(hdr->inode,
1048 hdr->args.offset, hdr->args.count,
1049 IOMODE_RW, NFS_I(hdr->inode)->layout,
1050 hdr->lseg);
1051 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1052 }
1053 }
1054
1055 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1056 {
1057 u32 idx = hdr->pgio_mirror_idx + 1;
1058 u32 new_idx = 0;
1059
1060 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
1061 ff_layout_send_layouterror(hdr->lseg);
1062 else
1063 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1064 pnfs_read_resend_pnfs(hdr, new_idx);
1065 }
1066
1067 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1068 {
1069 struct rpc_task *task = &hdr->task;
1070
1071 pnfs_layoutcommit_inode(hdr->inode, false);
1072 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1073
1074 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1075 dprintk("%s Reset task %5u for i/o through MDS "
1076 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1077 hdr->task.tk_pid,
1078 hdr->inode->i_sb->s_id,
1079 (unsigned long long)NFS_FILEID(hdr->inode),
1080 hdr->args.count,
1081 (unsigned long long)hdr->args.offset);
1082
1083 trace_pnfs_mds_fallback_read_done(hdr->inode,
1084 hdr->args.offset, hdr->args.count,
1085 IOMODE_READ, NFS_I(hdr->inode)->layout,
1086 hdr->lseg);
1087 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1088 }
1089 }
1090
1091 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1092 struct nfs4_state *state,
1093 struct nfs_client *clp,
1094 struct pnfs_layout_segment *lseg,
1095 u32 idx)
1096 {
1097 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1098 struct inode *inode = lo->plh_inode;
1099 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1100 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1101
1102 switch (task->tk_status) {
1103 case -NFS4ERR_BADSESSION:
1104 case -NFS4ERR_BADSLOT:
1105 case -NFS4ERR_BAD_HIGH_SLOT:
1106 case -NFS4ERR_DEADSESSION:
1107 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1108 case -NFS4ERR_SEQ_FALSE_RETRY:
1109 case -NFS4ERR_SEQ_MISORDERED:
1110 dprintk("%s ERROR %d, Reset session. Exchangeid "
1111 "flags 0x%x\n", __func__, task->tk_status,
1112 clp->cl_exchange_flags);
1113 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1114 break;
1115 case -NFS4ERR_DELAY:
1116 case -NFS4ERR_GRACE:
1117 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1118 break;
1119 case -NFS4ERR_RETRY_UNCACHED_REP:
1120 break;
1121 /* Invalidate Layout errors */
1122 case -NFS4ERR_PNFS_NO_LAYOUT:
1123 case -ESTALE: /* mapped NFS4ERR_STALE */
1124 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1125 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1126 case -NFS4ERR_FHEXPIRED:
1127 case -NFS4ERR_WRONG_TYPE:
1128 dprintk("%s Invalid layout error %d\n", __func__,
1129 task->tk_status);
1130 /*
1131 * Destroy layout so new i/o will get a new layout.
1132 * Layout will not be destroyed until all current lseg
1133 * references are put. Mark layout as invalid to resend failed
1134 * i/o and all i/o waiting on the slot table to the MDS until
1135 * layout is destroyed and a new valid layout is obtained.
1136 */
1137 pnfs_destroy_layout(NFS_I(inode));
1138 rpc_wake_up(&tbl->slot_tbl_waitq);
1139 goto reset;
1140 /* RPC connection errors */
1141 case -ECONNREFUSED:
1142 case -EHOSTDOWN:
1143 case -EHOSTUNREACH:
1144 case -ENETUNREACH:
1145 case -EIO:
1146 case -ETIMEDOUT:
1147 case -EPIPE:
1148 case -EPROTO:
1149 case -ENODEV:
1150 dprintk("%s DS connection error %d\n", __func__,
1151 task->tk_status);
1152 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1153 &devid->deviceid);
1154 rpc_wake_up(&tbl->slot_tbl_waitq);
1155 fallthrough;
1156 default:
1157 if (ff_layout_avoid_mds_available_ds(lseg))
1158 return -NFS4ERR_RESET_TO_PNFS;
1159 reset:
1160 dprintk("%s Retry through MDS. Error %d\n", __func__,
1161 task->tk_status);
1162 return -NFS4ERR_RESET_TO_MDS;
1163 }
1164 task->tk_status = 0;
1165 return -EAGAIN;
1166 }
1167
1168 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1169 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1170 struct pnfs_layout_segment *lseg,
1171 u32 idx)
1172 {
1173 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1174
1175 switch (task->tk_status) {
1176 /* File access problems. Don't mark the device as unavailable */
1177 case -EACCES:
1178 case -ESTALE:
1179 case -EISDIR:
1180 case -EBADHANDLE:
1181 case -ELOOP:
1182 case -ENOSPC:
1183 break;
1184 case -EJUKEBOX:
1185 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1186 goto out_retry;
1187 default:
1188 dprintk("%s DS connection error %d\n", __func__,
1189 task->tk_status);
1190 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1191 &devid->deviceid);
1192 }
1193 /* FIXME: Need to prevent infinite looping here. */
1194 return -NFS4ERR_RESET_TO_PNFS;
1195 out_retry:
1196 task->tk_status = 0;
1197 rpc_restart_call_prepare(task);
1198 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1199 return -EAGAIN;
1200 }
1201
1202 static int ff_layout_async_handle_error(struct rpc_task *task,
1203 struct nfs4_state *state,
1204 struct nfs_client *clp,
1205 struct pnfs_layout_segment *lseg,
1206 u32 idx)
1207 {
1208 int vers = clp->cl_nfs_mod->rpc_vers->number;
1209
1210 if (task->tk_status >= 0) {
1211 ff_layout_mark_ds_reachable(lseg, idx);
1212 return 0;
1213 }
1214
1215 /* Handle the case of an invalid layout segment */
1216 if (!pnfs_is_valid_lseg(lseg))
1217 return -NFS4ERR_RESET_TO_PNFS;
1218
1219 switch (vers) {
1220 case 3:
1221 return ff_layout_async_handle_error_v3(task, lseg, idx);
1222 case 4:
1223 return ff_layout_async_handle_error_v4(task, state, clp,
1224 lseg, idx);
1225 default:
1226 /* should never happen */
1227 WARN_ON_ONCE(1);
1228 return 0;
1229 }
1230 }
1231
1232 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1233 u32 idx, u64 offset, u64 length,
1234 u32 *op_status, int opnum, int error)
1235 {
1236 struct nfs4_ff_layout_mirror *mirror;
1237 u32 status = *op_status;
1238 int err;
1239
1240 if (status == 0) {
1241 switch (error) {
1242 case -ETIMEDOUT:
1243 case -EPFNOSUPPORT:
1244 case -EPROTONOSUPPORT:
1245 case -EOPNOTSUPP:
1246 case -EINVAL:
1247 case -ECONNREFUSED:
1248 case -ECONNRESET:
1249 case -EHOSTDOWN:
1250 case -EHOSTUNREACH:
1251 case -ENETUNREACH:
1252 case -EADDRINUSE:
1253 case -ENOBUFS:
1254 case -EPIPE:
1255 case -EPERM:
1256 case -EPROTO:
1257 case -ENODEV:
1258 *op_status = status = NFS4ERR_NXIO;
1259 break;
1260 case -EACCES:
1261 *op_status = status = NFS4ERR_ACCESS;
1262 break;
1263 default:
1264 return;
1265 }
1266 }
1267
1268 mirror = FF_LAYOUT_COMP(lseg, idx);
1269 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1270 mirror, offset, length, status, opnum,
1271 nfs_io_gfp_mask());
1272
1273 switch (status) {
1274 case NFS4ERR_DELAY:
1275 case NFS4ERR_GRACE:
1276 break;
1277 case NFS4ERR_NXIO:
1278 ff_layout_mark_ds_unreachable(lseg, idx);
1279 /*
1280 * Don't return the layout if this is a read and we still
1281 * have layouts to try
1282 */
1283 if (opnum == OP_READ)
1284 break;
1285 fallthrough;
1286 default:
1287 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1288 lseg);
1289 }
1290
1291 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1292 }
1293
1294 /* NFS_PROTO call done callback routines */
1295 static int ff_layout_read_done_cb(struct rpc_task *task,
1296 struct nfs_pgio_header *hdr)
1297 {
1298 int err;
1299
1300 if (task->tk_status < 0) {
1301 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1302 hdr->args.offset, hdr->args.count,
1303 &hdr->res.op_status, OP_READ,
1304 task->tk_status);
1305 trace_ff_layout_read_error(hdr);
1306 }
1307
1308 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1309 hdr->ds_clp, hdr->lseg,
1310 hdr->pgio_mirror_idx);
1311
1312 trace_nfs4_pnfs_read(hdr, err);
1313 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1314 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1315 switch (err) {
1316 case -NFS4ERR_RESET_TO_PNFS:
1317 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1318 return task->tk_status;
1319 case -NFS4ERR_RESET_TO_MDS:
1320 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1321 return task->tk_status;
1322 case -EAGAIN:
1323 goto out_eagain;
1324 }
1325
1326 return 0;
1327 out_eagain:
1328 rpc_restart_call_prepare(task);
1329 return -EAGAIN;
1330 }
1331
1332 static bool
1333 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1334 {
1335 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1336 }
1337
1338 /*
1339 * We reference the rpc_cred of the first WRITE that triggers the need for
1340 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1341 * rfc5661 is not clear about which credential should be used.
1342 *
1343 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1344 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1345 * we always send layoutcommit after DS writes.
1346 */
1347 static void
1348 ff_layout_set_layoutcommit(struct inode *inode,
1349 struct pnfs_layout_segment *lseg,
1350 loff_t end_offset)
1351 {
1352 if (!ff_layout_need_layoutcommit(lseg))
1353 return;
1354
1355 pnfs_set_layoutcommit(inode, lseg, end_offset);
1356 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1357 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1358 }
1359
1360 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1361 struct nfs_pgio_header *hdr)
1362 {
1363 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1364 return;
1365 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1366 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1367 hdr->args.count,
1368 task->tk_start);
1369 }
1370
1371 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1372 struct nfs_pgio_header *hdr)
1373 {
1374 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1375 return;
1376 nfs4_ff_layout_stat_io_end_read(task,
1377 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1378 hdr->args.count,
1379 hdr->res.count);
1380 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1381 }
1382
1383 static int ff_layout_read_prepare_common(struct rpc_task *task,
1384 struct nfs_pgio_header *hdr)
1385 {
1386 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1387 rpc_exit(task, -EIO);
1388 return -EIO;
1389 }
1390
1391 if (!pnfs_is_valid_lseg(hdr->lseg)) {
1392 rpc_exit(task, -EAGAIN);
1393 return -EAGAIN;
1394 }
1395
1396 ff_layout_read_record_layoutstats_start(task, hdr);
1397 return 0;
1398 }
1399
1400 /*
1401 * Call ops for the async read/write cases
1402 * In the case of dense layouts, the offset needs to be reset to its
1403 * original value.
1404 */
1405 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1406 {
1407 struct nfs_pgio_header *hdr = data;
1408
1409 if (ff_layout_read_prepare_common(task, hdr))
1410 return;
1411
1412 rpc_call_start(task);
1413 }
1414
1415 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1416 {
1417 struct nfs_pgio_header *hdr = data;
1418
1419 if (nfs4_setup_sequence(hdr->ds_clp,
1420 &hdr->args.seq_args,
1421 &hdr->res.seq_res,
1422 task))
1423 return;
1424
1425 ff_layout_read_prepare_common(task, hdr);
1426 }
1427
1428 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1429 {
1430 struct nfs_pgio_header *hdr = data;
1431
1432 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1433 task->tk_status == 0) {
1434 nfs4_sequence_done(task, &hdr->res.seq_res);
1435 return;
1436 }
1437
1438 /* Note this may cause RPC to be resent */
1439 hdr->mds_ops->rpc_call_done(task, hdr);
1440 }
1441
1442 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1443 {
1444 struct nfs_pgio_header *hdr = data;
1445
1446 ff_layout_read_record_layoutstats_done(task, hdr);
1447 rpc_count_iostats_metrics(task,
1448 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1449 }
1450
1451 static void ff_layout_read_release(void *data)
1452 {
1453 struct nfs_pgio_header *hdr = data;
1454
1455 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1456 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1457 ff_layout_resend_pnfs_read(hdr);
1458 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1459 ff_layout_reset_read(hdr);
1460 pnfs_generic_rw_release(data);
1461 }
1462
1463
1464 static int ff_layout_write_done_cb(struct rpc_task *task,
1465 struct nfs_pgio_header *hdr)
1466 {
1467 loff_t end_offs = 0;
1468 int err;
1469
1470 if (task->tk_status < 0) {
1471 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1472 hdr->args.offset, hdr->args.count,
1473 &hdr->res.op_status, OP_WRITE,
1474 task->tk_status);
1475 trace_ff_layout_write_error(hdr);
1476 }
1477
1478 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1479 hdr->ds_clp, hdr->lseg,
1480 hdr->pgio_mirror_idx);
1481
1482 trace_nfs4_pnfs_write(hdr, err);
1483 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1484 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1485 switch (err) {
1486 case -NFS4ERR_RESET_TO_PNFS:
1487 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1488 return task->tk_status;
1489 case -NFS4ERR_RESET_TO_MDS:
1490 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1491 return task->tk_status;
1492 case -EAGAIN:
1493 return -EAGAIN;
1494 }
1495
1496 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1497 hdr->res.verf->committed == NFS_DATA_SYNC)
1498 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1499
1500 /* Note: if the write is unstable, don't set end_offs until commit */
1501 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1502
1503 /* zero out fattr since we don't care DS attr at all */
1504 hdr->fattr.valid = 0;
1505 if (task->tk_status >= 0)
1506 nfs_writeback_update_inode(hdr);
1507
1508 return 0;
1509 }
1510
1511 static int ff_layout_commit_done_cb(struct rpc_task *task,
1512 struct nfs_commit_data *data)
1513 {
1514 int err;
1515
1516 if (task->tk_status < 0) {
1517 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1518 data->args.offset, data->args.count,
1519 &data->res.op_status, OP_COMMIT,
1520 task->tk_status);
1521 trace_ff_layout_commit_error(data);
1522 }
1523
1524 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1525 data->lseg, data->ds_commit_index);
1526
1527 trace_nfs4_pnfs_commit_ds(data, err);
1528 switch (err) {
1529 case -NFS4ERR_RESET_TO_PNFS:
1530 pnfs_generic_prepare_to_resend_writes(data);
1531 return -EAGAIN;
1532 case -NFS4ERR_RESET_TO_MDS:
1533 pnfs_generic_prepare_to_resend_writes(data);
1534 return -EAGAIN;
1535 case -EAGAIN:
1536 rpc_restart_call_prepare(task);
1537 return -EAGAIN;
1538 }
1539
1540 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1541
1542 return 0;
1543 }
1544
1545 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1546 struct nfs_pgio_header *hdr)
1547 {
1548 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1549 return;
1550 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1551 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1552 hdr->args.count,
1553 task->tk_start);
1554 }
1555
1556 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1557 struct nfs_pgio_header *hdr)
1558 {
1559 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1560 return;
1561 nfs4_ff_layout_stat_io_end_write(task,
1562 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1563 hdr->args.count, hdr->res.count,
1564 hdr->res.verf->committed);
1565 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1566 }
1567
1568 static int ff_layout_write_prepare_common(struct rpc_task *task,
1569 struct nfs_pgio_header *hdr)
1570 {
1571 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1572 rpc_exit(task, -EIO);
1573 return -EIO;
1574 }
1575
1576 if (!pnfs_is_valid_lseg(hdr->lseg)) {
1577 rpc_exit(task, -EAGAIN);
1578 return -EAGAIN;
1579 }
1580
1581 ff_layout_write_record_layoutstats_start(task, hdr);
1582 return 0;
1583 }
1584
1585 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1586 {
1587 struct nfs_pgio_header *hdr = data;
1588
1589 if (ff_layout_write_prepare_common(task, hdr))
1590 return;
1591
1592 rpc_call_start(task);
1593 }
1594
1595 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1596 {
1597 struct nfs_pgio_header *hdr = data;
1598
1599 if (nfs4_setup_sequence(hdr->ds_clp,
1600 &hdr->args.seq_args,
1601 &hdr->res.seq_res,
1602 task))
1603 return;
1604
1605 ff_layout_write_prepare_common(task, hdr);
1606 }
1607
1608 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1609 {
1610 struct nfs_pgio_header *hdr = data;
1611
1612 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1613 task->tk_status == 0) {
1614 nfs4_sequence_done(task, &hdr->res.seq_res);
1615 return;
1616 }
1617
1618 /* Note this may cause RPC to be resent */
1619 hdr->mds_ops->rpc_call_done(task, hdr);
1620 }
1621
1622 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1623 {
1624 struct nfs_pgio_header *hdr = data;
1625
1626 ff_layout_write_record_layoutstats_done(task, hdr);
1627 rpc_count_iostats_metrics(task,
1628 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1629 }
1630
1631 static void ff_layout_write_release(void *data)
1632 {
1633 struct nfs_pgio_header *hdr = data;
1634
1635 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1636 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1637 ff_layout_send_layouterror(hdr->lseg);
1638 ff_layout_reset_write(hdr, true);
1639 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1640 ff_layout_reset_write(hdr, false);
1641 pnfs_generic_rw_release(data);
1642 }
1643
1644 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1645 struct nfs_commit_data *cdata)
1646 {
1647 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1648 return;
1649 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1650 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1651 0, task->tk_start);
1652 }
1653
1654 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1655 struct nfs_commit_data *cdata)
1656 {
1657 struct nfs_page *req;
1658 __u64 count = 0;
1659
1660 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1661 return;
1662
1663 if (task->tk_status == 0) {
1664 list_for_each_entry(req, &cdata->pages, wb_list)
1665 count += req->wb_bytes;
1666 }
1667 nfs4_ff_layout_stat_io_end_write(task,
1668 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1669 count, count, NFS_FILE_SYNC);
1670 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1671 }
1672
1673 static int ff_layout_commit_prepare_common(struct rpc_task *task,
1674 struct nfs_commit_data *cdata)
1675 {
1676 if (!pnfs_is_valid_lseg(cdata->lseg)) {
1677 rpc_exit(task, -EAGAIN);
1678 return -EAGAIN;
1679 }
1680
1681 ff_layout_commit_record_layoutstats_start(task, cdata);
1682 return 0;
1683 }
1684
1685 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1686 {
1687 if (ff_layout_commit_prepare_common(task, data))
1688 return;
1689
1690 rpc_call_start(task);
1691 }
1692
1693 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1694 {
1695 struct nfs_commit_data *wdata = data;
1696
1697 if (nfs4_setup_sequence(wdata->ds_clp,
1698 &wdata->args.seq_args,
1699 &wdata->res.seq_res,
1700 task))
1701 return;
1702 ff_layout_commit_prepare_common(task, data);
1703 }
1704
1705 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1706 {
1707 pnfs_generic_write_commit_done(task, data);
1708 }
1709
1710 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1711 {
1712 struct nfs_commit_data *cdata = data;
1713
1714 ff_layout_commit_record_layoutstats_done(task, cdata);
1715 rpc_count_iostats_metrics(task,
1716 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1717 }
1718
1719 static void ff_layout_commit_release(void *data)
1720 {
1721 struct nfs_commit_data *cdata = data;
1722
1723 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1724 pnfs_generic_commit_release(data);
1725 }
1726
1727 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1728 .rpc_call_prepare = ff_layout_read_prepare_v3,
1729 .rpc_call_done = ff_layout_read_call_done,
1730 .rpc_count_stats = ff_layout_read_count_stats,
1731 .rpc_release = ff_layout_read_release,
1732 };
1733
1734 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1735 .rpc_call_prepare = ff_layout_read_prepare_v4,
1736 .rpc_call_done = ff_layout_read_call_done,
1737 .rpc_count_stats = ff_layout_read_count_stats,
1738 .rpc_release = ff_layout_read_release,
1739 };
1740
1741 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1742 .rpc_call_prepare = ff_layout_write_prepare_v3,
1743 .rpc_call_done = ff_layout_write_call_done,
1744 .rpc_count_stats = ff_layout_write_count_stats,
1745 .rpc_release = ff_layout_write_release,
1746 };
1747
1748 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1749 .rpc_call_prepare = ff_layout_write_prepare_v4,
1750 .rpc_call_done = ff_layout_write_call_done,
1751 .rpc_count_stats = ff_layout_write_count_stats,
1752 .rpc_release = ff_layout_write_release,
1753 };
1754
1755 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1756 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1757 .rpc_call_done = ff_layout_commit_done,
1758 .rpc_count_stats = ff_layout_commit_count_stats,
1759 .rpc_release = ff_layout_commit_release,
1760 };
1761
1762 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1763 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1764 .rpc_call_done = ff_layout_commit_done,
1765 .rpc_count_stats = ff_layout_commit_count_stats,
1766 .rpc_release = ff_layout_commit_release,
1767 };
1768
1769 static enum pnfs_try_status
1770 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1771 {
1772 struct pnfs_layout_segment *lseg = hdr->lseg;
1773 struct nfs4_pnfs_ds *ds;
1774 struct rpc_clnt *ds_clnt;
1775 struct nfsd_file *localio;
1776 struct nfs4_ff_layout_mirror *mirror;
1777 const struct cred *ds_cred;
1778 loff_t offset = hdr->args.offset;
1779 u32 idx = hdr->pgio_mirror_idx;
1780 int vers;
1781 struct nfs_fh *fh;
1782
1783 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1784 __func__, hdr->inode->i_ino,
1785 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1786
1787 mirror = FF_LAYOUT_COMP(lseg, idx);
1788 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1789 if (!ds)
1790 goto out_failed;
1791
1792 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, 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(mirror, &lseg->pls_range, hdr->cred);
1798 if (!ds_cred)
1799 goto out_failed;
1800
1801 vers = nfs4_ff_layout_ds_version(mirror);
1802
1803 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1804 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1805
1806 hdr->pgio_done_cb = ff_layout_read_done_cb;
1807 refcount_inc(&ds->ds_clp->cl_count);
1808 hdr->ds_clp = ds->ds_clp;
1809 fh = nfs4_ff_layout_select_ds_fh(mirror);
1810 if (fh)
1811 hdr->args.fh = fh;
1812
1813 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1814
1815 /*
1816 * Note that if we ever decide to split across DSes,
1817 * then we may need to handle dense-like offsets.
1818 */
1819 hdr->args.offset = offset;
1820 hdr->mds_offset = offset;
1821
1822 /* Start IO accounting for local read */
1823 localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh, FMODE_READ);
1824 if (localio) {
1825 hdr->task.tk_start = ktime_get();
1826 ff_layout_read_record_layoutstats_start(&hdr->task, hdr);
1827 }
1828
1829 /* Perform an asynchronous read to ds */
1830 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1831 vers == 3 ? &ff_layout_read_call_ops_v3 :
1832 &ff_layout_read_call_ops_v4,
1833 0, RPC_TASK_SOFTCONN, localio);
1834 put_cred(ds_cred);
1835 return PNFS_ATTEMPTED;
1836
1837 out_failed:
1838 if (ff_layout_avoid_mds_available_ds(lseg))
1839 return PNFS_TRY_AGAIN;
1840 trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1841 hdr->args.offset, hdr->args.count,
1842 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
1843 return PNFS_NOT_ATTEMPTED;
1844 }
1845
1846 /* Perform async writes. */
1847 static enum pnfs_try_status
1848 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1849 {
1850 struct pnfs_layout_segment *lseg = hdr->lseg;
1851 struct nfs4_pnfs_ds *ds;
1852 struct rpc_clnt *ds_clnt;
1853 struct nfsd_file *localio;
1854 struct nfs4_ff_layout_mirror *mirror;
1855 const struct cred *ds_cred;
1856 loff_t offset = hdr->args.offset;
1857 int vers;
1858 struct nfs_fh *fh;
1859 u32 idx = hdr->pgio_mirror_idx;
1860
1861 mirror = FF_LAYOUT_COMP(lseg, idx);
1862 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1863 if (!ds)
1864 goto out_failed;
1865
1866 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1867 hdr->inode);
1868 if (IS_ERR(ds_clnt))
1869 goto out_failed;
1870
1871 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1872 if (!ds_cred)
1873 goto out_failed;
1874
1875 vers = nfs4_ff_layout_ds_version(mirror);
1876
1877 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1878 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1879 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1880 vers);
1881
1882 hdr->pgio_done_cb = ff_layout_write_done_cb;
1883 refcount_inc(&ds->ds_clp->cl_count);
1884 hdr->ds_clp = ds->ds_clp;
1885 hdr->ds_commit_idx = idx;
1886 fh = nfs4_ff_layout_select_ds_fh(mirror);
1887 if (fh)
1888 hdr->args.fh = fh;
1889
1890 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1891
1892 /*
1893 * Note that if we ever decide to split across DSes,
1894 * then we may need to handle dense-like offsets.
1895 */
1896 hdr->args.offset = offset;
1897
1898 /* Start IO accounting for local write */
1899 localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh,
1900 FMODE_READ|FMODE_WRITE);
1901 if (localio) {
1902 hdr->task.tk_start = ktime_get();
1903 ff_layout_write_record_layoutstats_start(&hdr->task, hdr);
1904 }
1905
1906 /* Perform an asynchronous write */
1907 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1908 vers == 3 ? &ff_layout_write_call_ops_v3 :
1909 &ff_layout_write_call_ops_v4,
1910 sync, RPC_TASK_SOFTCONN, localio);
1911 put_cred(ds_cred);
1912 return PNFS_ATTEMPTED;
1913
1914 out_failed:
1915 if (ff_layout_avoid_mds_available_ds(lseg))
1916 return PNFS_TRY_AGAIN;
1917 trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1918 hdr->args.offset, hdr->args.count,
1919 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
1920 return PNFS_NOT_ATTEMPTED;
1921 }
1922
1923 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1924 {
1925 return i;
1926 }
1927
1928 static struct nfs_fh *
1929 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1930 {
1931 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1932
1933 /* FIXME: Assume that there is only one NFS version available
1934 * for the DS.
1935 */
1936 return &flseg->mirror_array[i]->fh_versions[0];
1937 }
1938
1939 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1940 {
1941 struct pnfs_layout_segment *lseg = data->lseg;
1942 struct nfs4_pnfs_ds *ds;
1943 struct rpc_clnt *ds_clnt;
1944 struct nfsd_file *localio;
1945 struct nfs4_ff_layout_mirror *mirror;
1946 const struct cred *ds_cred;
1947 u32 idx;
1948 int vers, ret;
1949 struct nfs_fh *fh;
1950
1951 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1952 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1953 goto out_err;
1954
1955 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1956 mirror = FF_LAYOUT_COMP(lseg, idx);
1957 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1958 if (!ds)
1959 goto out_err;
1960
1961 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1962 data->inode);
1963 if (IS_ERR(ds_clnt))
1964 goto out_err;
1965
1966 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
1967 if (!ds_cred)
1968 goto out_err;
1969
1970 vers = nfs4_ff_layout_ds_version(mirror);
1971
1972 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1973 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
1974 vers);
1975 data->commit_done_cb = ff_layout_commit_done_cb;
1976 data->cred = ds_cred;
1977 refcount_inc(&ds->ds_clp->cl_count);
1978 data->ds_clp = ds->ds_clp;
1979 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1980 if (fh)
1981 data->args.fh = fh;
1982
1983 /* Start IO accounting for local commit */
1984 localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh,
1985 FMODE_READ|FMODE_WRITE);
1986 if (localio) {
1987 data->task.tk_start = ktime_get();
1988 ff_layout_commit_record_layoutstats_start(&data->task, data);
1989 }
1990
1991 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1992 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1993 &ff_layout_commit_call_ops_v4,
1994 how, RPC_TASK_SOFTCONN, localio);
1995 put_cred(ds_cred);
1996 return ret;
1997 out_err:
1998 pnfs_generic_prepare_to_resend_writes(data);
1999 pnfs_generic_commit_release(data);
2000 return -EAGAIN;
2001 }
2002
2003 static int
2004 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
2005 int how, struct nfs_commit_info *cinfo)
2006 {
2007 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
2008 ff_layout_initiate_commit);
2009 }
2010
2011 static bool ff_layout_match_rw(const struct rpc_task *task,
2012 const struct nfs_pgio_header *hdr,
2013 const struct pnfs_layout_segment *lseg)
2014 {
2015 return hdr->lseg == lseg;
2016 }
2017
2018 static bool ff_layout_match_commit(const struct rpc_task *task,
2019 const struct nfs_commit_data *cdata,
2020 const struct pnfs_layout_segment *lseg)
2021 {
2022 return cdata->lseg == lseg;
2023 }
2024
2025 static bool ff_layout_match_io(const struct rpc_task *task, const void *data)
2026 {
2027 const struct rpc_call_ops *ops = task->tk_ops;
2028
2029 if (ops == &ff_layout_read_call_ops_v3 ||
2030 ops == &ff_layout_read_call_ops_v4 ||
2031 ops == &ff_layout_write_call_ops_v3 ||
2032 ops == &ff_layout_write_call_ops_v4)
2033 return ff_layout_match_rw(task, task->tk_calldata, data);
2034 if (ops == &ff_layout_commit_call_ops_v3 ||
2035 ops == &ff_layout_commit_call_ops_v4)
2036 return ff_layout_match_commit(task, task->tk_calldata, data);
2037 return false;
2038 }
2039
2040 static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg)
2041 {
2042 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2043 struct nfs4_ff_layout_mirror *mirror;
2044 struct nfs4_ff_layout_ds *mirror_ds;
2045 struct nfs4_pnfs_ds *ds;
2046 struct nfs_client *ds_clp;
2047 struct rpc_clnt *clnt;
2048 u32 idx;
2049
2050 for (idx = 0; idx < flseg->mirror_array_cnt; idx++) {
2051 mirror = flseg->mirror_array[idx];
2052 mirror_ds = mirror->mirror_ds;
2053 if (IS_ERR_OR_NULL(mirror_ds))
2054 continue;
2055 ds = mirror->mirror_ds->ds;
2056 if (!ds)
2057 continue;
2058 ds_clp = ds->ds_clp;
2059 if (!ds_clp)
2060 continue;
2061 clnt = ds_clp->cl_rpcclient;
2062 if (!clnt)
2063 continue;
2064 if (!rpc_cancel_tasks(clnt, -EAGAIN, ff_layout_match_io, lseg))
2065 continue;
2066 rpc_clnt_disconnect(clnt);
2067 }
2068 }
2069
2070 static struct pnfs_ds_commit_info *
2071 ff_layout_get_ds_info(struct inode *inode)
2072 {
2073 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
2074
2075 if (layout == NULL)
2076 return NULL;
2077
2078 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
2079 }
2080
2081 static void
2082 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2083 struct pnfs_layout_segment *lseg)
2084 {
2085 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2086 struct inode *inode = lseg->pls_layout->plh_inode;
2087 struct pnfs_commit_array *array, *new;
2088
2089 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt,
2090 nfs_io_gfp_mask());
2091 if (new) {
2092 spin_lock(&inode->i_lock);
2093 array = pnfs_add_commit_array(fl_cinfo, new, lseg);
2094 spin_unlock(&inode->i_lock);
2095 if (array != new)
2096 pnfs_free_commit_array(new);
2097 }
2098 }
2099
2100 static void
2101 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2102 struct inode *inode)
2103 {
2104 spin_lock(&inode->i_lock);
2105 pnfs_generic_ds_cinfo_destroy(fl_cinfo);
2106 spin_unlock(&inode->i_lock);
2107 }
2108
2109 static void
2110 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
2111 {
2112 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
2113 id_node));
2114 }
2115
2116 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
2117 const struct nfs4_layoutreturn_args *args,
2118 const struct nfs4_flexfile_layoutreturn_args *ff_args)
2119 {
2120 __be32 *start;
2121
2122 start = xdr_reserve_space(xdr, 4);
2123 if (unlikely(!start))
2124 return -E2BIG;
2125
2126 *start = cpu_to_be32(ff_args->num_errors);
2127 /* This assume we always return _ALL_ layouts */
2128 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2129 }
2130
2131 static void
2132 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2133 const nfs4_stateid *stateid,
2134 const struct nfs42_layoutstat_devinfo *devinfo)
2135 {
2136 __be32 *p;
2137
2138 p = xdr_reserve_space(xdr, 8 + 8);
2139 p = xdr_encode_hyper(p, devinfo->offset);
2140 p = xdr_encode_hyper(p, devinfo->length);
2141 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2142 p = xdr_reserve_space(xdr, 4*8);
2143 p = xdr_encode_hyper(p, devinfo->read_count);
2144 p = xdr_encode_hyper(p, devinfo->read_bytes);
2145 p = xdr_encode_hyper(p, devinfo->write_count);
2146 p = xdr_encode_hyper(p, devinfo->write_bytes);
2147 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2148 }
2149
2150 static void
2151 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2152 const nfs4_stateid *stateid,
2153 const struct nfs42_layoutstat_devinfo *devinfo)
2154 {
2155 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2156 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2157 devinfo->ld_private.data);
2158 }
2159
2160 /* report nothing for now */
2161 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2162 const struct nfs4_layoutreturn_args *args,
2163 struct nfs4_flexfile_layoutreturn_args *ff_args)
2164 {
2165 __be32 *p;
2166 int i;
2167
2168 p = xdr_reserve_space(xdr, 4);
2169 *p = cpu_to_be32(ff_args->num_dev);
2170 for (i = 0; i < ff_args->num_dev; i++)
2171 ff_layout_encode_ff_iostat(xdr,
2172 &args->layout->plh_stateid,
2173 &ff_args->devinfo[i]);
2174 }
2175
2176 static void
2177 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2178 unsigned int num_entries)
2179 {
2180 unsigned int i;
2181
2182 for (i = 0; i < num_entries; i++) {
2183 if (!devinfo[i].ld_private.ops)
2184 continue;
2185 if (!devinfo[i].ld_private.ops->free)
2186 continue;
2187 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2188 }
2189 }
2190
2191 static struct nfs4_deviceid_node *
2192 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2193 struct pnfs_device *pdev, gfp_t gfp_flags)
2194 {
2195 struct nfs4_ff_layout_ds *dsaddr;
2196
2197 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2198 if (!dsaddr)
2199 return NULL;
2200 return &dsaddr->id_node;
2201 }
2202
2203 static void
2204 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2205 const void *voidargs,
2206 const struct nfs4_xdr_opaque_data *ff_opaque)
2207 {
2208 const struct nfs4_layoutreturn_args *args = voidargs;
2209 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2210 struct xdr_buf tmp_buf = {
2211 .head = {
2212 [0] = {
2213 .iov_base = page_address(ff_args->pages[0]),
2214 },
2215 },
2216 .buflen = PAGE_SIZE,
2217 };
2218 struct xdr_stream tmp_xdr;
2219 __be32 *start;
2220
2221 dprintk("%s: Begin\n", __func__);
2222
2223 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2224
2225 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2226 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2227
2228 start = xdr_reserve_space(xdr, 4);
2229 *start = cpu_to_be32(tmp_buf.len);
2230 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2231
2232 dprintk("%s: Return\n", __func__);
2233 }
2234
2235 static void
2236 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2237 {
2238 struct nfs4_flexfile_layoutreturn_args *ff_args;
2239
2240 if (!args->data)
2241 return;
2242 ff_args = args->data;
2243 args->data = NULL;
2244
2245 ff_layout_free_ds_ioerr(&ff_args->errors);
2246 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2247
2248 put_page(ff_args->pages[0]);
2249 kfree(ff_args);
2250 }
2251
2252 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2253 .encode = ff_layout_encode_layoutreturn,
2254 .free = ff_layout_free_layoutreturn,
2255 };
2256
2257 static int
2258 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2259 {
2260 struct nfs4_flexfile_layoutreturn_args *ff_args;
2261 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2262
2263 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask());
2264 if (!ff_args)
2265 goto out_nomem;
2266 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
2267 if (!ff_args->pages[0])
2268 goto out_nomem_free;
2269
2270 INIT_LIST_HEAD(&ff_args->errors);
2271 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2272 &args->range, &ff_args->errors,
2273 FF_LAYOUTRETURN_MAXERR);
2274
2275 spin_lock(&args->inode->i_lock);
2276 ff_args->num_dev = ff_layout_mirror_prepare_stats(
2277 &ff_layout->generic_hdr, &ff_args->devinfo[0],
2278 ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN);
2279 spin_unlock(&args->inode->i_lock);
2280
2281 args->ld_private->ops = &layoutreturn_ops;
2282 args->ld_private->data = ff_args;
2283 return 0;
2284 out_nomem_free:
2285 kfree(ff_args);
2286 out_nomem:
2287 return -ENOMEM;
2288 }
2289
2290 #ifdef CONFIG_NFS_V4_2
2291 void
2292 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2293 {
2294 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2295 struct nfs42_layout_error *errors;
2296 LIST_HEAD(head);
2297
2298 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2299 return;
2300 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2301 if (list_empty(&head))
2302 return;
2303
2304 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors),
2305 nfs_io_gfp_mask());
2306 if (errors != NULL) {
2307 const struct nfs4_ff_layout_ds_err *pos;
2308 size_t n = 0;
2309
2310 list_for_each_entry(pos, &head, list) {
2311 errors[n].offset = pos->offset;
2312 errors[n].length = pos->length;
2313 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2314 errors[n].errors[0].dev_id = pos->deviceid;
2315 errors[n].errors[0].status = pos->status;
2316 errors[n].errors[0].opnum = pos->opnum;
2317 n++;
2318 if (!list_is_last(&pos->list, &head) &&
2319 n < NFS42_LAYOUTERROR_MAX)
2320 continue;
2321 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2322 break;
2323 n = 0;
2324 }
2325 kfree(errors);
2326 }
2327 ff_layout_free_ds_ioerr(&head);
2328 }
2329 #else
2330 void
2331 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2332 {
2333 }
2334 #endif
2335
2336 static int
2337 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2338 {
2339 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2340
2341 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2342 }
2343
2344 static size_t
2345 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2346 const int buflen)
2347 {
2348 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2349 const struct in6_addr *addr = &sin6->sin6_addr;
2350
2351 /*
2352 * RFC 4291, Section 2.2.2
2353 *
2354 * Shorthanded ANY address
2355 */
2356 if (ipv6_addr_any(addr))
2357 return snprintf(buf, buflen, "::");
2358
2359 /*
2360 * RFC 4291, Section 2.2.2
2361 *
2362 * Shorthanded loopback address
2363 */
2364 if (ipv6_addr_loopback(addr))
2365 return snprintf(buf, buflen, "::1");
2366
2367 /*
2368 * RFC 4291, Section 2.2.3
2369 *
2370 * Special presentation address format for mapped v4
2371 * addresses.
2372 */
2373 if (ipv6_addr_v4mapped(addr))
2374 return snprintf(buf, buflen, "::ffff:%pI4",
2375 &addr->s6_addr32[3]);
2376
2377 /*
2378 * RFC 4291, Section 2.2.1
2379 */
2380 return snprintf(buf, buflen, "%pI6c", addr);
2381 }
2382
2383 /* Derived from rpc_sockaddr2uaddr */
2384 static void
2385 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2386 {
2387 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2388 char portbuf[RPCBIND_MAXUADDRPLEN];
2389 char addrbuf[RPCBIND_MAXUADDRLEN];
2390 unsigned short port;
2391 int len, netid_len;
2392 __be32 *p;
2393
2394 switch (sap->sa_family) {
2395 case AF_INET:
2396 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2397 return;
2398 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2399 break;
2400 case AF_INET6:
2401 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2402 return;
2403 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2404 break;
2405 default:
2406 WARN_ON_ONCE(1);
2407 return;
2408 }
2409
2410 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2411 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2412
2413 netid_len = strlen(da->da_netid);
2414 p = xdr_reserve_space(xdr, 4 + netid_len);
2415 xdr_encode_opaque(p, da->da_netid, netid_len);
2416
2417 p = xdr_reserve_space(xdr, 4 + len);
2418 xdr_encode_opaque(p, addrbuf, len);
2419 }
2420
2421 static void
2422 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2423 ktime_t t)
2424 {
2425 struct timespec64 ts;
2426 __be32 *p;
2427
2428 p = xdr_reserve_space(xdr, 12);
2429 ts = ktime_to_timespec64(t);
2430 p = xdr_encode_hyper(p, ts.tv_sec);
2431 *p++ = cpu_to_be32(ts.tv_nsec);
2432 }
2433
2434 static void
2435 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2436 struct nfs4_ff_io_stat *stat)
2437 {
2438 __be32 *p;
2439
2440 p = xdr_reserve_space(xdr, 5 * 8);
2441 p = xdr_encode_hyper(p, stat->ops_requested);
2442 p = xdr_encode_hyper(p, stat->bytes_requested);
2443 p = xdr_encode_hyper(p, stat->ops_completed);
2444 p = xdr_encode_hyper(p, stat->bytes_completed);
2445 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2446 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2447 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2448 }
2449
2450 static void
2451 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2452 const struct nfs42_layoutstat_devinfo *devinfo,
2453 struct nfs4_ff_layout_mirror *mirror)
2454 {
2455 struct nfs4_pnfs_ds_addr *da;
2456 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2457 struct nfs_fh *fh = &mirror->fh_versions[0];
2458 __be32 *p;
2459
2460 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2461 dprintk("%s: DS %s: encoding address %s\n",
2462 __func__, ds->ds_remotestr, da->da_remotestr);
2463 /* netaddr4 */
2464 ff_layout_encode_netaddr(xdr, da);
2465 /* nfs_fh4 */
2466 p = xdr_reserve_space(xdr, 4 + fh->size);
2467 xdr_encode_opaque(p, fh->data, fh->size);
2468 /* ff_io_latency4 read */
2469 spin_lock(&mirror->lock);
2470 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2471 /* ff_io_latency4 write */
2472 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2473 spin_unlock(&mirror->lock);
2474 /* nfstime4 */
2475 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2476 /* bool */
2477 p = xdr_reserve_space(xdr, 4);
2478 *p = cpu_to_be32(false);
2479 }
2480
2481 static void
2482 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2483 const struct nfs4_xdr_opaque_data *opaque)
2484 {
2485 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2486 struct nfs42_layoutstat_devinfo, ld_private);
2487 __be32 *start;
2488
2489 /* layoutupdate length */
2490 start = xdr_reserve_space(xdr, 4);
2491 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2492
2493 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2494 }
2495
2496 static void
2497 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2498 {
2499 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2500
2501 ff_layout_put_mirror(mirror);
2502 }
2503
2504 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2505 .encode = ff_layout_encode_layoutstats,
2506 .free = ff_layout_free_layoutstats,
2507 };
2508
2509 static int
2510 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2511 struct nfs42_layoutstat_devinfo *devinfo,
2512 int dev_limit, enum nfs4_ff_op_type type)
2513 {
2514 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2515 struct nfs4_ff_layout_mirror *mirror;
2516 struct nfs4_deviceid_node *dev;
2517 int i = 0;
2518
2519 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2520 if (i >= dev_limit)
2521 break;
2522 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2523 continue;
2524 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL,
2525 &mirror->flags) &&
2526 type != NFS4_FF_OP_LAYOUTRETURN)
2527 continue;
2528 /* mirror refcount put in cleanup_layoutstats */
2529 if (!refcount_inc_not_zero(&mirror->ref))
2530 continue;
2531 dev = &mirror->mirror_ds->id_node;
2532 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2533 devinfo->offset = 0;
2534 devinfo->length = NFS4_MAX_UINT64;
2535 spin_lock(&mirror->lock);
2536 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2537 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2538 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2539 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2540 spin_unlock(&mirror->lock);
2541 devinfo->layout_type = LAYOUT_FLEX_FILES;
2542 devinfo->ld_private.ops = &layoutstat_ops;
2543 devinfo->ld_private.data = mirror;
2544
2545 devinfo++;
2546 i++;
2547 }
2548 return i;
2549 }
2550
2551 static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2552 {
2553 struct pnfs_layout_hdr *lo;
2554 struct nfs4_flexfile_layout *ff_layout;
2555 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2556
2557 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2558 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo),
2559 nfs_io_gfp_mask());
2560 if (!args->devinfo)
2561 return -ENOMEM;
2562
2563 spin_lock(&args->inode->i_lock);
2564 lo = NFS_I(args->inode)->layout;
2565 if (lo && pnfs_layout_is_valid(lo)) {
2566 ff_layout = FF_LAYOUT_FROM_HDR(lo);
2567 args->num_dev = ff_layout_mirror_prepare_stats(
2568 &ff_layout->generic_hdr, &args->devinfo[0], dev_count,
2569 NFS4_FF_OP_LAYOUTSTATS);
2570 } else
2571 args->num_dev = 0;
2572 spin_unlock(&args->inode->i_lock);
2573 if (!args->num_dev) {
2574 kfree(args->devinfo);
2575 args->devinfo = NULL;
2576 return -ENOENT;
2577 }
2578
2579 return 0;
2580 }
2581
2582 static int
2583 ff_layout_set_layoutdriver(struct nfs_server *server,
2584 const struct nfs_fh *dummy)
2585 {
2586 #if IS_ENABLED(CONFIG_NFS_V4_2)
2587 server->caps |= NFS_CAP_LAYOUTSTATS | NFS_CAP_REBOOT_LAYOUTRETURN;
2588 #endif
2589 return 0;
2590 }
2591
2592 static const struct pnfs_commit_ops ff_layout_commit_ops = {
2593 .setup_ds_info = ff_layout_setup_ds_info,
2594 .release_ds_info = ff_layout_release_ds_info,
2595 .mark_request_commit = pnfs_layout_mark_request_commit,
2596 .clear_request_commit = pnfs_generic_clear_request_commit,
2597 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2598 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2599 .commit_pagelist = ff_layout_commit_pagelist,
2600 };
2601
2602 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2603 .id = LAYOUT_FLEX_FILES,
2604 .name = "LAYOUT_FLEX_FILES",
2605 .owner = THIS_MODULE,
2606 .flags = PNFS_LAYOUTGET_ON_OPEN,
2607 .max_layoutget_response = 4096, /* 1 page or so... */
2608 .set_layoutdriver = ff_layout_set_layoutdriver,
2609 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2610 .free_layout_hdr = ff_layout_free_layout_hdr,
2611 .alloc_lseg = ff_layout_alloc_lseg,
2612 .free_lseg = ff_layout_free_lseg,
2613 .add_lseg = ff_layout_add_lseg,
2614 .pg_read_ops = &ff_layout_pg_read_ops,
2615 .pg_write_ops = &ff_layout_pg_write_ops,
2616 .get_ds_info = ff_layout_get_ds_info,
2617 .free_deviceid_node = ff_layout_free_deviceid_node,
2618 .read_pagelist = ff_layout_read_pagelist,
2619 .write_pagelist = ff_layout_write_pagelist,
2620 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2621 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2622 .sync = pnfs_nfs_generic_sync,
2623 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2624 .cancel_io = ff_layout_cancel_io,
2625 };
2626
2627 static int __init nfs4flexfilelayout_init(void)
2628 {
2629 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2630 __func__);
2631 return pnfs_register_layoutdriver(&flexfilelayout_type);
2632 }
2633
2634 static void __exit nfs4flexfilelayout_exit(void)
2635 {
2636 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2637 __func__);
2638 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2639 }
2640
2641 MODULE_ALIAS("nfs-layouttype4-4");
2642
2643 MODULE_LICENSE("GPL");
2644 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2645
2646 module_init(nfs4flexfilelayout_init);
2647 module_exit(nfs4flexfilelayout_exit);
2648
2649 module_param(io_maxretrans, ushort, 0644);
2650 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
2651 "retries an I/O request before returning an error. ");
Kernel DRM miscellaneous fixes and cross-tree changes