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[mirror_ubuntu-disco-kernel.git] / fs / nfs / flexfilelayout / flexfilelayout.c
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>
14
15 #include "flexfilelayout.h"
16 #include "../nfs4session.h"
17 #include "../nfs4idmap.h"
18 #include "../internal.h"
19 #include "../delegation.h"
20 #include "../nfs4trace.h"
21 #include "../iostat.h"
22 #include "../nfs.h"
23 #include "../nfs42.h"
24
25 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
26
27 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
28
29 static struct pnfs_layout_hdr *
30 ff_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);
37 INIT_LIST_HEAD(&ffl->mirrors);
38 return &ffl->generic_hdr;
39 } else
40 return NULL;
41 }
42
43 static void
44 ff_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
56 static 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
69 static 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
81 static 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 */
112 static int
113 decode_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
139 static 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; j++) {
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
161 static struct nfs4_ff_layout_mirror *
162 ff_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
186 static void
187 ff_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
199 static 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);
207 INIT_LIST_HEAD(&mirror->mirrors);
208 }
209 return mirror;
210 }
211
212 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
213 {
214 ff_layout_remove_mirror(mirror);
215 kfree(mirror->fh_versions);
216 if (mirror->cred)
217 put_rpccred(mirror->cred);
218 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
219 kfree(mirror);
220 }
221
222 static 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
228 static 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 */
237 ff_layout_put_mirror(fls->mirror_array[i]);
238 }
239 kfree(fls->mirror_array);
240 fls->mirror_array = NULL;
241 }
242 }
243
244 static 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
262 static 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
270 static bool
271 ff_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
287 static bool
288 ff_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
318 static void
319 ff_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
329 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
330 {
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 <
336 fls->mirror_array[j]->efficiency)
337 swap(fls->mirror_array[i],
338 fls->mirror_array[j]);
339 }
340 }
341
342 static 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
355 static struct pnfs_layout_segment *
356 ff_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++) {
407 struct nfs4_ff_layout_mirror *mirror;
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
424 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
425 if (fls->mirror_array[i] == NULL) {
426 rc = -ENOMEM;
427 goto out_err_free;
428 }
429
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
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
502 dprintk("%s: uid %d gid %d\n", __func__,
503 fls->mirror_array[i]->uid,
504 fls->mirror_array[i]->gid);
505 }
506
507 p = xdr_inline_decode(&stream, 4);
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);
517
518 out_sort_mirrors:
519 ff_layout_sort_mirrors(fls);
520 rc = ff_layout_check_layout(lgr);
521 if (rc)
522 goto out_err_free;
523 ff_layout_mark_devices_valid(fls);
524
525 ret = &fls->generic_hdr;
526 dprintk("<-- %s (success)\n", __func__);
527 out_free_page:
528 __free_page(scratch);
529 return ret;
530 out_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
537 static 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
548 static void
549 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
550 {
551 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
552
553 dprintk("--> %s\n", __func__);
554
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 */
573 static int
574 ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
575 {
576 return 1;
577 }
578
579 static void
580 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
581 {
582 /* first IO request? */
583 if (atomic_inc_return(&timer->n_ops) == 1) {
584 timer->start_time = now;
585 }
586 }
587
588 static ktime_t
589 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
590 {
591 ktime_t start;
592
593 if (atomic_dec_return(&timer->n_ops) < 0)
594 WARN_ON_ONCE(1);
595
596 start = timer->start_time;
597 timer->start_time = now;
598 return ktime_sub(now, start);
599 }
600
601 static bool
602 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
603 struct nfs4_ff_layoutstat *layoutstat,
604 ktime_t now)
605 {
606 static const ktime_t notime = {0};
607 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
608
609 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
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;
614 if (mirror->report_interval != 0)
615 report_interval = (s64)mirror->report_interval * 1000LL;
616 else if (layoutstats_timer != 0)
617 report_interval = (s64)layoutstats_timer * 1000LL;
618 if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >=
619 report_interval) {
620 mirror->last_report_time = now;
621 return true;
622 }
623
624 return false;
625 }
626
627 static void
628 nfs4_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
637 static void
638 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
639 __u64 requested,
640 __u64 completed,
641 ktime_t time_completed,
642 ktime_t time_started)
643 {
644 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
645 ktime_t completion_time = ktime_sub(time_completed, time_started);
646 ktime_t timer;
647
648 iostat->ops_completed++;
649 iostat->bytes_completed += completed;
650 iostat->bytes_not_delivered += requested - completed;
651
652 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
653 iostat->total_busy_time =
654 ktime_add(iostat->total_busy_time, timer);
655 iostat->aggregate_completion_time =
656 ktime_add(iostat->aggregate_completion_time,
657 completion_time);
658 }
659
660 static void
661 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
662 struct nfs4_ff_layout_mirror *mirror,
663 __u64 requested, ktime_t now)
664 {
665 bool report;
666
667 spin_lock(&mirror->lock);
668 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
669 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
670 spin_unlock(&mirror->lock);
671
672 if (report)
673 pnfs_report_layoutstat(inode, GFP_KERNEL);
674 }
675
676 static void
677 nfs4_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,
685 ktime_get(), task->tk_start);
686 spin_unlock(&mirror->lock);
687 }
688
689 static void
690 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
691 struct nfs4_ff_layout_mirror *mirror,
692 __u64 requested, ktime_t now)
693 {
694 bool report;
695
696 spin_lock(&mirror->lock);
697 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
698 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
699 spin_unlock(&mirror->lock);
700
701 if (report)
702 pnfs_report_layoutstat(inode, GFP_NOIO);
703 }
704
705 static void
706 nfs4_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,
717 requested, completed, ktime_get(), task->tk_start);
718 spin_unlock(&mirror->lock);
719 }
720
721 static int
722 ff_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
767 static struct nfs4_pnfs_ds *
768 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
769 int start_idx,
770 int *best_idx)
771 {
772 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
773 struct nfs4_pnfs_ds *ds;
774 int idx;
775
776 /* mirrors are sorted by efficiency */
777 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
778 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
779 if (ds) {
780 *best_idx = idx;
781 return ds;
782 }
783 }
784
785 return NULL;
786 }
787
788 static void
789 ff_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 */
798 if (!pgio->pg_lseg) {
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);
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 }
811 /* If no lseg, fall back to read through mds */
812 if (pgio->pg_lseg == NULL)
813 goto out_mds;
814
815 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
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;
827 out_mds:
828 pnfs_put_lseg(pgio->pg_lseg);
829 pgio->pg_lseg = NULL;
830 nfs_pageio_reset_read_mds(pgio);
831 }
832
833 static void
834 ff_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
844 if (!pgio->pg_lseg) {
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);
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 }
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
882 out_mds:
883 pnfs_put_lseg(pgio->pg_lseg);
884 pgio->pg_lseg = NULL;
885 nfs_pageio_reset_write_mds(pgio);
886 }
887
888 static unsigned int
889 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
890 struct nfs_page *req)
891 {
892 if (!pgio->pg_lseg) {
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);
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 }
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 */
909 nfs_pageio_reset_write_mds(pgio);
910 out:
911 return 1;
912 }
913
914 static 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
921 static 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
929 static 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 hdr->completion_ops->reschedule_io(hdr);
945 return;
946 }
947
948 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
949 dprintk("%s Reset task %5u for i/o through MDS "
950 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
951 hdr->task.tk_pid,
952 hdr->inode->i_sb->s_id,
953 (unsigned long long)NFS_FILEID(hdr->inode),
954 hdr->args.count,
955 (unsigned long long)hdr->args.offset);
956
957 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
958 }
959 }
960
961 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
962 {
963 struct rpc_task *task = &hdr->task;
964
965 pnfs_layoutcommit_inode(hdr->inode, false);
966
967 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
968 dprintk("%s Reset task %5u for i/o through MDS "
969 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
970 hdr->task.tk_pid,
971 hdr->inode->i_sb->s_id,
972 (unsigned long long)NFS_FILEID(hdr->inode),
973 hdr->args.count,
974 (unsigned long long)hdr->args.offset);
975
976 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
977 }
978 }
979
980 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
981 struct nfs4_state *state,
982 struct nfs_client *clp,
983 struct pnfs_layout_segment *lseg,
984 int idx)
985 {
986 struct pnfs_layout_hdr *lo = lseg->pls_layout;
987 struct inode *inode = lo->plh_inode;
988 struct nfs_server *mds_server = NFS_SERVER(inode);
989
990 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
991 struct nfs_client *mds_client = mds_server->nfs_client;
992 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
993
994 if (task->tk_status >= 0)
995 return 0;
996
997 switch (task->tk_status) {
998 /* MDS state errors */
999 case -NFS4ERR_DELEG_REVOKED:
1000 case -NFS4ERR_ADMIN_REVOKED:
1001 case -NFS4ERR_BAD_STATEID:
1002 if (state == NULL)
1003 break;
1004 nfs_remove_bad_delegation(state->inode);
1005 case -NFS4ERR_OPENMODE:
1006 if (state == NULL)
1007 break;
1008 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1009 goto out_bad_stateid;
1010 goto wait_on_recovery;
1011 case -NFS4ERR_EXPIRED:
1012 if (state != NULL) {
1013 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
1014 goto out_bad_stateid;
1015 }
1016 nfs4_schedule_lease_recovery(mds_client);
1017 goto wait_on_recovery;
1018 /* DS session errors */
1019 case -NFS4ERR_BADSESSION:
1020 case -NFS4ERR_BADSLOT:
1021 case -NFS4ERR_BAD_HIGH_SLOT:
1022 case -NFS4ERR_DEADSESSION:
1023 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1024 case -NFS4ERR_SEQ_FALSE_RETRY:
1025 case -NFS4ERR_SEQ_MISORDERED:
1026 dprintk("%s ERROR %d, Reset session. Exchangeid "
1027 "flags 0x%x\n", __func__, task->tk_status,
1028 clp->cl_exchange_flags);
1029 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1030 break;
1031 case -NFS4ERR_DELAY:
1032 case -NFS4ERR_GRACE:
1033 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1034 break;
1035 case -NFS4ERR_RETRY_UNCACHED_REP:
1036 break;
1037 /* Invalidate Layout errors */
1038 case -NFS4ERR_PNFS_NO_LAYOUT:
1039 case -ESTALE: /* mapped NFS4ERR_STALE */
1040 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1041 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1042 case -NFS4ERR_FHEXPIRED:
1043 case -NFS4ERR_WRONG_TYPE:
1044 dprintk("%s Invalid layout error %d\n", __func__,
1045 task->tk_status);
1046 /*
1047 * Destroy layout so new i/o will get a new layout.
1048 * Layout will not be destroyed until all current lseg
1049 * references are put. Mark layout as invalid to resend failed
1050 * i/o and all i/o waiting on the slot table to the MDS until
1051 * layout is destroyed and a new valid layout is obtained.
1052 */
1053 pnfs_destroy_layout(NFS_I(inode));
1054 rpc_wake_up(&tbl->slot_tbl_waitq);
1055 goto reset;
1056 /* RPC connection errors */
1057 case -ECONNREFUSED:
1058 case -EHOSTDOWN:
1059 case -EHOSTUNREACH:
1060 case -ENETUNREACH:
1061 case -EIO:
1062 case -ETIMEDOUT:
1063 case -EPIPE:
1064 dprintk("%s DS connection error %d\n", __func__,
1065 task->tk_status);
1066 nfs4_mark_deviceid_unavailable(devid);
1067 rpc_wake_up(&tbl->slot_tbl_waitq);
1068 /* fall through */
1069 default:
1070 if (ff_layout_no_fallback_to_mds(lseg) ||
1071 ff_layout_has_available_ds(lseg))
1072 return -NFS4ERR_RESET_TO_PNFS;
1073 reset:
1074 dprintk("%s Retry through MDS. Error %d\n", __func__,
1075 task->tk_status);
1076 return -NFS4ERR_RESET_TO_MDS;
1077 }
1078 out:
1079 task->tk_status = 0;
1080 return -EAGAIN;
1081 out_bad_stateid:
1082 task->tk_status = -EIO;
1083 return 0;
1084 wait_on_recovery:
1085 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
1086 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
1087 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
1088 goto out;
1089 }
1090
1091 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1092 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1093 struct pnfs_layout_segment *lseg,
1094 int idx)
1095 {
1096 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1097
1098 if (task->tk_status >= 0)
1099 return 0;
1100
1101 switch (task->tk_status) {
1102 /* File access problems. Don't mark the device as unavailable */
1103 case -EACCES:
1104 case -ESTALE:
1105 case -EISDIR:
1106 case -EBADHANDLE:
1107 case -ELOOP:
1108 case -ENOSPC:
1109 break;
1110 case -EJUKEBOX:
1111 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1112 goto out_retry;
1113 default:
1114 dprintk("%s DS connection error %d\n", __func__,
1115 task->tk_status);
1116 nfs4_mark_deviceid_unavailable(devid);
1117 }
1118 /* FIXME: Need to prevent infinite looping here. */
1119 return -NFS4ERR_RESET_TO_PNFS;
1120 out_retry:
1121 task->tk_status = 0;
1122 rpc_restart_call_prepare(task);
1123 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1124 return -EAGAIN;
1125 }
1126
1127 static int ff_layout_async_handle_error(struct rpc_task *task,
1128 struct nfs4_state *state,
1129 struct nfs_client *clp,
1130 struct pnfs_layout_segment *lseg,
1131 int idx)
1132 {
1133 int vers = clp->cl_nfs_mod->rpc_vers->number;
1134
1135 switch (vers) {
1136 case 3:
1137 return ff_layout_async_handle_error_v3(task, lseg, idx);
1138 case 4:
1139 return ff_layout_async_handle_error_v4(task, state, clp,
1140 lseg, idx);
1141 default:
1142 /* should never happen */
1143 WARN_ON_ONCE(1);
1144 return 0;
1145 }
1146 }
1147
1148 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1149 int idx, u64 offset, u64 length,
1150 u32 status, int opnum, int error)
1151 {
1152 struct nfs4_ff_layout_mirror *mirror;
1153 int err;
1154
1155 if (status == 0) {
1156 switch (error) {
1157 case -ETIMEDOUT:
1158 case -EPFNOSUPPORT:
1159 case -EPROTONOSUPPORT:
1160 case -EOPNOTSUPP:
1161 case -ECONNREFUSED:
1162 case -ECONNRESET:
1163 case -EHOSTDOWN:
1164 case -EHOSTUNREACH:
1165 case -ENETUNREACH:
1166 case -EADDRINUSE:
1167 case -ENOBUFS:
1168 case -EPIPE:
1169 case -EPERM:
1170 status = NFS4ERR_NXIO;
1171 break;
1172 case -EACCES:
1173 status = NFS4ERR_ACCESS;
1174 break;
1175 default:
1176 return;
1177 }
1178 }
1179
1180 switch (status) {
1181 case NFS4ERR_DELAY:
1182 case NFS4ERR_GRACE:
1183 return;
1184 default:
1185 break;
1186 }
1187
1188 mirror = FF_LAYOUT_COMP(lseg, idx);
1189 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1190 mirror, offset, length, status, opnum,
1191 GFP_NOIO);
1192 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
1193 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1194 }
1195
1196 /* NFS_PROTO call done callback routines */
1197 static int ff_layout_read_done_cb(struct rpc_task *task,
1198 struct nfs_pgio_header *hdr)
1199 {
1200 int err;
1201
1202 trace_nfs4_pnfs_read(hdr, task->tk_status);
1203 if (task->tk_status < 0)
1204 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1205 hdr->args.offset, hdr->args.count,
1206 hdr->res.op_status, OP_READ,
1207 task->tk_status);
1208 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1209 hdr->ds_clp, hdr->lseg,
1210 hdr->pgio_mirror_idx);
1211
1212 switch (err) {
1213 case -NFS4ERR_RESET_TO_PNFS:
1214 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1215 hdr->pgio_mirror_idx + 1,
1216 &hdr->pgio_mirror_idx))
1217 goto out_eagain;
1218 set_bit(NFS_LAYOUT_RETURN_REQUESTED,
1219 &hdr->lseg->pls_layout->plh_flags);
1220 pnfs_read_resend_pnfs(hdr);
1221 return task->tk_status;
1222 case -NFS4ERR_RESET_TO_MDS:
1223 ff_layout_reset_read(hdr);
1224 return task->tk_status;
1225 case -EAGAIN:
1226 goto out_eagain;
1227 }
1228
1229 return 0;
1230 out_eagain:
1231 rpc_restart_call_prepare(task);
1232 return -EAGAIN;
1233 }
1234
1235 static bool
1236 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1237 {
1238 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1239 }
1240
1241 /*
1242 * We reference the rpc_cred of the first WRITE that triggers the need for
1243 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1244 * rfc5661 is not clear about which credential should be used.
1245 *
1246 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1247 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1248 * we always send layoutcommit after DS writes.
1249 */
1250 static void
1251 ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
1252 {
1253 if (!ff_layout_need_layoutcommit(hdr->lseg))
1254 return;
1255
1256 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1257 hdr->mds_offset + hdr->res.count);
1258 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
1259 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
1260 }
1261
1262 static bool
1263 ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx)
1264 {
1265 /* No mirroring for now */
1266 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
1267
1268 return ff_layout_test_devid_unavailable(node);
1269 }
1270
1271 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1272 struct nfs_pgio_header *hdr)
1273 {
1274 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1275 return;
1276 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1277 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1278 hdr->args.count,
1279 task->tk_start);
1280 }
1281
1282 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1283 struct nfs_pgio_header *hdr)
1284 {
1285 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1286 return;
1287 nfs4_ff_layout_stat_io_end_read(task,
1288 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1289 hdr->args.count,
1290 hdr->res.count);
1291 }
1292
1293 static int ff_layout_read_prepare_common(struct rpc_task *task,
1294 struct nfs_pgio_header *hdr)
1295 {
1296 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1297 rpc_exit(task, -EIO);
1298 return -EIO;
1299 }
1300 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1301 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
1302 if (ff_layout_has_available_ds(hdr->lseg))
1303 pnfs_read_resend_pnfs(hdr);
1304 else
1305 ff_layout_reset_read(hdr);
1306 rpc_exit(task, 0);
1307 return -EAGAIN;
1308 }
1309 hdr->pgio_done_cb = ff_layout_read_done_cb;
1310
1311 ff_layout_read_record_layoutstats_start(task, hdr);
1312 return 0;
1313 }
1314
1315 /*
1316 * Call ops for the async read/write cases
1317 * In the case of dense layouts, the offset needs to be reset to its
1318 * original value.
1319 */
1320 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1321 {
1322 struct nfs_pgio_header *hdr = data;
1323
1324 if (ff_layout_read_prepare_common(task, hdr))
1325 return;
1326
1327 rpc_call_start(task);
1328 }
1329
1330 static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
1331 struct nfs4_sequence_args *args,
1332 struct nfs4_sequence_res *res,
1333 struct rpc_task *task)
1334 {
1335 if (ds_clp->cl_session)
1336 return nfs41_setup_sequence(ds_clp->cl_session,
1337 args,
1338 res,
1339 task);
1340 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
1341 args,
1342 res,
1343 task);
1344 }
1345
1346 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1347 {
1348 struct nfs_pgio_header *hdr = data;
1349
1350 if (ff_layout_setup_sequence(hdr->ds_clp,
1351 &hdr->args.seq_args,
1352 &hdr->res.seq_res,
1353 task))
1354 return;
1355
1356 if (ff_layout_read_prepare_common(task, hdr))
1357 return;
1358
1359 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1360 hdr->args.lock_context, FMODE_READ) == -EIO)
1361 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1362 }
1363
1364 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1365 {
1366 struct nfs_pgio_header *hdr = data;
1367
1368 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1369
1370 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1371 task->tk_status == 0) {
1372 nfs4_sequence_done(task, &hdr->res.seq_res);
1373 return;
1374 }
1375
1376 /* Note this may cause RPC to be resent */
1377 hdr->mds_ops->rpc_call_done(task, hdr);
1378 }
1379
1380 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1381 {
1382 struct nfs_pgio_header *hdr = data;
1383
1384 ff_layout_read_record_layoutstats_done(task, hdr);
1385 rpc_count_iostats_metrics(task,
1386 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1387 }
1388
1389 static void ff_layout_read_release(void *data)
1390 {
1391 struct nfs_pgio_header *hdr = data;
1392
1393 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1394 pnfs_generic_rw_release(data);
1395 }
1396
1397
1398 static int ff_layout_write_done_cb(struct rpc_task *task,
1399 struct nfs_pgio_header *hdr)
1400 {
1401 int err;
1402
1403 trace_nfs4_pnfs_write(hdr, task->tk_status);
1404 if (task->tk_status < 0)
1405 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1406 hdr->args.offset, hdr->args.count,
1407 hdr->res.op_status, OP_WRITE,
1408 task->tk_status);
1409 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1410 hdr->ds_clp, hdr->lseg,
1411 hdr->pgio_mirror_idx);
1412
1413 switch (err) {
1414 case -NFS4ERR_RESET_TO_PNFS:
1415 ff_layout_reset_write(hdr, true);
1416 return task->tk_status;
1417 case -NFS4ERR_RESET_TO_MDS:
1418 ff_layout_reset_write(hdr, false);
1419 return task->tk_status;
1420 case -EAGAIN:
1421 return -EAGAIN;
1422 }
1423
1424 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1425 hdr->res.verf->committed == NFS_DATA_SYNC)
1426 ff_layout_set_layoutcommit(hdr);
1427
1428 /* zero out fattr since we don't care DS attr at all */
1429 hdr->fattr.valid = 0;
1430 if (task->tk_status >= 0)
1431 nfs_writeback_update_inode(hdr);
1432
1433 return 0;
1434 }
1435
1436 static int ff_layout_commit_done_cb(struct rpc_task *task,
1437 struct nfs_commit_data *data)
1438 {
1439 int err;
1440
1441 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1442 if (task->tk_status < 0)
1443 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1444 data->args.offset, data->args.count,
1445 data->res.op_status, OP_COMMIT,
1446 task->tk_status);
1447 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1448 data->lseg, data->ds_commit_index);
1449
1450 switch (err) {
1451 case -NFS4ERR_RESET_TO_PNFS:
1452 pnfs_generic_prepare_to_resend_writes(data);
1453 return -EAGAIN;
1454 case -NFS4ERR_RESET_TO_MDS:
1455 pnfs_generic_prepare_to_resend_writes(data);
1456 return -EAGAIN;
1457 case -EAGAIN:
1458 rpc_restart_call_prepare(task);
1459 return -EAGAIN;
1460 }
1461
1462 if (data->verf.committed == NFS_UNSTABLE
1463 && ff_layout_need_layoutcommit(data->lseg))
1464 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
1465
1466 return 0;
1467 }
1468
1469 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1470 struct nfs_pgio_header *hdr)
1471 {
1472 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1473 return;
1474 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1475 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1476 hdr->args.count,
1477 task->tk_start);
1478 }
1479
1480 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1481 struct nfs_pgio_header *hdr)
1482 {
1483 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1484 return;
1485 nfs4_ff_layout_stat_io_end_write(task,
1486 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1487 hdr->args.count, hdr->res.count,
1488 hdr->res.verf->committed);
1489 }
1490
1491 static int ff_layout_write_prepare_common(struct rpc_task *task,
1492 struct nfs_pgio_header *hdr)
1493 {
1494 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1495 rpc_exit(task, -EIO);
1496 return -EIO;
1497 }
1498
1499 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1500 bool retry_pnfs;
1501
1502 retry_pnfs = ff_layout_has_available_ds(hdr->lseg);
1503 dprintk("%s task %u reset io to %s\n", __func__,
1504 task->tk_pid, retry_pnfs ? "pNFS" : "MDS");
1505 ff_layout_reset_write(hdr, retry_pnfs);
1506 rpc_exit(task, 0);
1507 return -EAGAIN;
1508 }
1509
1510 ff_layout_write_record_layoutstats_start(task, hdr);
1511 return 0;
1512 }
1513
1514 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1515 {
1516 struct nfs_pgio_header *hdr = data;
1517
1518 if (ff_layout_write_prepare_common(task, hdr))
1519 return;
1520
1521 rpc_call_start(task);
1522 }
1523
1524 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1525 {
1526 struct nfs_pgio_header *hdr = data;
1527
1528 if (ff_layout_setup_sequence(hdr->ds_clp,
1529 &hdr->args.seq_args,
1530 &hdr->res.seq_res,
1531 task))
1532 return;
1533
1534 if (ff_layout_write_prepare_common(task, hdr))
1535 return;
1536
1537 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1538 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1539 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1540 }
1541
1542 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1543 {
1544 struct nfs_pgio_header *hdr = data;
1545
1546 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1547 task->tk_status == 0) {
1548 nfs4_sequence_done(task, &hdr->res.seq_res);
1549 return;
1550 }
1551
1552 /* Note this may cause RPC to be resent */
1553 hdr->mds_ops->rpc_call_done(task, hdr);
1554 }
1555
1556 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1557 {
1558 struct nfs_pgio_header *hdr = data;
1559
1560 ff_layout_write_record_layoutstats_done(task, hdr);
1561 rpc_count_iostats_metrics(task,
1562 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1563 }
1564
1565 static void ff_layout_write_release(void *data)
1566 {
1567 struct nfs_pgio_header *hdr = data;
1568
1569 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1570 pnfs_generic_rw_release(data);
1571 }
1572
1573 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1574 struct nfs_commit_data *cdata)
1575 {
1576 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1577 return;
1578 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1579 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1580 0, task->tk_start);
1581 }
1582
1583 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1584 struct nfs_commit_data *cdata)
1585 {
1586 struct nfs_page *req;
1587 __u64 count = 0;
1588
1589 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1590 return;
1591
1592 if (task->tk_status == 0) {
1593 list_for_each_entry(req, &cdata->pages, wb_list)
1594 count += req->wb_bytes;
1595 }
1596 nfs4_ff_layout_stat_io_end_write(task,
1597 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1598 count, count, NFS_FILE_SYNC);
1599 }
1600
1601 static void ff_layout_commit_prepare_common(struct rpc_task *task,
1602 struct nfs_commit_data *cdata)
1603 {
1604 ff_layout_commit_record_layoutstats_start(task, cdata);
1605 }
1606
1607 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1608 {
1609 ff_layout_commit_prepare_common(task, data);
1610 rpc_call_start(task);
1611 }
1612
1613 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1614 {
1615 struct nfs_commit_data *wdata = data;
1616
1617 if (ff_layout_setup_sequence(wdata->ds_clp,
1618 &wdata->args.seq_args,
1619 &wdata->res.seq_res,
1620 task))
1621 return;
1622 ff_layout_commit_prepare_common(task, data);
1623 }
1624
1625 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1626 {
1627 pnfs_generic_write_commit_done(task, data);
1628 }
1629
1630 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1631 {
1632 struct nfs_commit_data *cdata = data;
1633
1634 ff_layout_commit_record_layoutstats_done(task, cdata);
1635 rpc_count_iostats_metrics(task,
1636 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1637 }
1638
1639 static void ff_layout_commit_release(void *data)
1640 {
1641 struct nfs_commit_data *cdata = data;
1642
1643 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1644 pnfs_generic_commit_release(data);
1645 }
1646
1647 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1648 .rpc_call_prepare = ff_layout_read_prepare_v3,
1649 .rpc_call_done = ff_layout_read_call_done,
1650 .rpc_count_stats = ff_layout_read_count_stats,
1651 .rpc_release = ff_layout_read_release,
1652 };
1653
1654 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1655 .rpc_call_prepare = ff_layout_read_prepare_v4,
1656 .rpc_call_done = ff_layout_read_call_done,
1657 .rpc_count_stats = ff_layout_read_count_stats,
1658 .rpc_release = ff_layout_read_release,
1659 };
1660
1661 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1662 .rpc_call_prepare = ff_layout_write_prepare_v3,
1663 .rpc_call_done = ff_layout_write_call_done,
1664 .rpc_count_stats = ff_layout_write_count_stats,
1665 .rpc_release = ff_layout_write_release,
1666 };
1667
1668 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1669 .rpc_call_prepare = ff_layout_write_prepare_v4,
1670 .rpc_call_done = ff_layout_write_call_done,
1671 .rpc_count_stats = ff_layout_write_count_stats,
1672 .rpc_release = ff_layout_write_release,
1673 };
1674
1675 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1676 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1677 .rpc_call_done = ff_layout_commit_done,
1678 .rpc_count_stats = ff_layout_commit_count_stats,
1679 .rpc_release = ff_layout_commit_release,
1680 };
1681
1682 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1683 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1684 .rpc_call_done = ff_layout_commit_done,
1685 .rpc_count_stats = ff_layout_commit_count_stats,
1686 .rpc_release = ff_layout_commit_release,
1687 };
1688
1689 static enum pnfs_try_status
1690 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1691 {
1692 struct pnfs_layout_segment *lseg = hdr->lseg;
1693 struct nfs4_pnfs_ds *ds;
1694 struct rpc_clnt *ds_clnt;
1695 struct rpc_cred *ds_cred;
1696 loff_t offset = hdr->args.offset;
1697 u32 idx = hdr->pgio_mirror_idx;
1698 int vers;
1699 struct nfs_fh *fh;
1700
1701 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1702 __func__, hdr->inode->i_ino,
1703 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1704
1705 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1706 if (!ds)
1707 goto out_failed;
1708
1709 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1710 hdr->inode);
1711 if (IS_ERR(ds_clnt))
1712 goto out_failed;
1713
1714 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1715 if (IS_ERR(ds_cred))
1716 goto out_failed;
1717
1718 vers = nfs4_ff_layout_ds_version(lseg, idx);
1719
1720 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1721 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1722
1723 atomic_inc(&ds->ds_clp->cl_count);
1724 hdr->ds_clp = ds->ds_clp;
1725 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1726 if (fh)
1727 hdr->args.fh = fh;
1728 /*
1729 * Note that if we ever decide to split across DSes,
1730 * then we may need to handle dense-like offsets.
1731 */
1732 hdr->args.offset = offset;
1733 hdr->mds_offset = offset;
1734
1735 /* Perform an asynchronous read to ds */
1736 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1737 vers == 3 ? &ff_layout_read_call_ops_v3 :
1738 &ff_layout_read_call_ops_v4,
1739 0, RPC_TASK_SOFTCONN);
1740
1741 return PNFS_ATTEMPTED;
1742
1743 out_failed:
1744 if (ff_layout_has_available_ds(lseg))
1745 return PNFS_TRY_AGAIN;
1746 return PNFS_NOT_ATTEMPTED;
1747 }
1748
1749 /* Perform async writes. */
1750 static enum pnfs_try_status
1751 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1752 {
1753 struct pnfs_layout_segment *lseg = hdr->lseg;
1754 struct nfs4_pnfs_ds *ds;
1755 struct rpc_clnt *ds_clnt;
1756 struct rpc_cred *ds_cred;
1757 loff_t offset = hdr->args.offset;
1758 int vers;
1759 struct nfs_fh *fh;
1760 int idx = hdr->pgio_mirror_idx;
1761
1762 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1763 if (!ds)
1764 return PNFS_NOT_ATTEMPTED;
1765
1766 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1767 hdr->inode);
1768 if (IS_ERR(ds_clnt))
1769 return PNFS_NOT_ATTEMPTED;
1770
1771 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1772 if (IS_ERR(ds_cred))
1773 return PNFS_NOT_ATTEMPTED;
1774
1775 vers = nfs4_ff_layout_ds_version(lseg, idx);
1776
1777 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1778 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1779 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1780 vers);
1781
1782 hdr->pgio_done_cb = ff_layout_write_done_cb;
1783 atomic_inc(&ds->ds_clp->cl_count);
1784 hdr->ds_clp = ds->ds_clp;
1785 hdr->ds_commit_idx = idx;
1786 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1787 if (fh)
1788 hdr->args.fh = fh;
1789
1790 /*
1791 * Note that if we ever decide to split across DSes,
1792 * then we may need to handle dense-like offsets.
1793 */
1794 hdr->args.offset = offset;
1795
1796 /* Perform an asynchronous write */
1797 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1798 vers == 3 ? &ff_layout_write_call_ops_v3 :
1799 &ff_layout_write_call_ops_v4,
1800 sync, RPC_TASK_SOFTCONN);
1801 return PNFS_ATTEMPTED;
1802 }
1803
1804 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1805 {
1806 return i;
1807 }
1808
1809 static struct nfs_fh *
1810 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1811 {
1812 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1813
1814 /* FIXME: Assume that there is only one NFS version available
1815 * for the DS.
1816 */
1817 return &flseg->mirror_array[i]->fh_versions[0];
1818 }
1819
1820 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1821 {
1822 struct pnfs_layout_segment *lseg = data->lseg;
1823 struct nfs4_pnfs_ds *ds;
1824 struct rpc_clnt *ds_clnt;
1825 struct rpc_cred *ds_cred;
1826 u32 idx;
1827 int vers;
1828 struct nfs_fh *fh;
1829
1830 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1831 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1832 if (!ds)
1833 goto out_err;
1834
1835 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1836 data->inode);
1837 if (IS_ERR(ds_clnt))
1838 goto out_err;
1839
1840 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1841 if (IS_ERR(ds_cred))
1842 goto out_err;
1843
1844 vers = nfs4_ff_layout_ds_version(lseg, idx);
1845
1846 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1847 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1848 vers);
1849 data->commit_done_cb = ff_layout_commit_done_cb;
1850 data->cred = ds_cred;
1851 atomic_inc(&ds->ds_clp->cl_count);
1852 data->ds_clp = ds->ds_clp;
1853 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1854 if (fh)
1855 data->args.fh = fh;
1856
1857 return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1858 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1859 &ff_layout_commit_call_ops_v4,
1860 how, RPC_TASK_SOFTCONN);
1861 out_err:
1862 pnfs_generic_prepare_to_resend_writes(data);
1863 pnfs_generic_commit_release(data);
1864 return -EAGAIN;
1865 }
1866
1867 static int
1868 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1869 int how, struct nfs_commit_info *cinfo)
1870 {
1871 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1872 ff_layout_initiate_commit);
1873 }
1874
1875 static struct pnfs_ds_commit_info *
1876 ff_layout_get_ds_info(struct inode *inode)
1877 {
1878 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1879
1880 if (layout == NULL)
1881 return NULL;
1882
1883 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1884 }
1885
1886 static void
1887 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
1888 {
1889 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1890 id_node));
1891 }
1892
1893 static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1894 struct xdr_stream *xdr,
1895 const struct nfs4_layoutreturn_args *args)
1896 {
1897 struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
1898 __be32 *start;
1899 int count = 0, ret = 0;
1900
1901 start = xdr_reserve_space(xdr, 4);
1902 if (unlikely(!start))
1903 return -E2BIG;
1904
1905 /* This assume we always return _ALL_ layouts */
1906 spin_lock(&hdr->plh_inode->i_lock);
1907 ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
1908 spin_unlock(&hdr->plh_inode->i_lock);
1909
1910 *start = cpu_to_be32(count);
1911
1912 return ret;
1913 }
1914
1915 /* report nothing for now */
1916 static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1917 struct xdr_stream *xdr,
1918 const struct nfs4_layoutreturn_args *args)
1919 {
1920 __be32 *p;
1921
1922 p = xdr_reserve_space(xdr, 4);
1923 if (likely(p))
1924 *p = cpu_to_be32(0);
1925 }
1926
1927 static struct nfs4_deviceid_node *
1928 ff_layout_alloc_deviceid_node(struct nfs_server *server,
1929 struct pnfs_device *pdev, gfp_t gfp_flags)
1930 {
1931 struct nfs4_ff_layout_ds *dsaddr;
1932
1933 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
1934 if (!dsaddr)
1935 return NULL;
1936 return &dsaddr->id_node;
1937 }
1938
1939 static void
1940 ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
1941 struct xdr_stream *xdr,
1942 const struct nfs4_layoutreturn_args *args)
1943 {
1944 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
1945 __be32 *start;
1946
1947 dprintk("%s: Begin\n", __func__);
1948 start = xdr_reserve_space(xdr, 4);
1949 BUG_ON(!start);
1950
1951 ff_layout_encode_ioerr(flo, xdr, args);
1952 ff_layout_encode_iostats(flo, xdr, args);
1953
1954 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1955 dprintk("%s: Return\n", __func__);
1956 }
1957
1958 static int
1959 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
1960 {
1961 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
1962
1963 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
1964 }
1965
1966 static size_t
1967 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
1968 const int buflen)
1969 {
1970 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
1971 const struct in6_addr *addr = &sin6->sin6_addr;
1972
1973 /*
1974 * RFC 4291, Section 2.2.2
1975 *
1976 * Shorthanded ANY address
1977 */
1978 if (ipv6_addr_any(addr))
1979 return snprintf(buf, buflen, "::");
1980
1981 /*
1982 * RFC 4291, Section 2.2.2
1983 *
1984 * Shorthanded loopback address
1985 */
1986 if (ipv6_addr_loopback(addr))
1987 return snprintf(buf, buflen, "::1");
1988
1989 /*
1990 * RFC 4291, Section 2.2.3
1991 *
1992 * Special presentation address format for mapped v4
1993 * addresses.
1994 */
1995 if (ipv6_addr_v4mapped(addr))
1996 return snprintf(buf, buflen, "::ffff:%pI4",
1997 &addr->s6_addr32[3]);
1998
1999 /*
2000 * RFC 4291, Section 2.2.1
2001 */
2002 return snprintf(buf, buflen, "%pI6c", addr);
2003 }
2004
2005 /* Derived from rpc_sockaddr2uaddr */
2006 static void
2007 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2008 {
2009 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2010 char portbuf[RPCBIND_MAXUADDRPLEN];
2011 char addrbuf[RPCBIND_MAXUADDRLEN];
2012 char *netid;
2013 unsigned short port;
2014 int len, netid_len;
2015 __be32 *p;
2016
2017 switch (sap->sa_family) {
2018 case AF_INET:
2019 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2020 return;
2021 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2022 netid = "tcp";
2023 netid_len = 3;
2024 break;
2025 case AF_INET6:
2026 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2027 return;
2028 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2029 netid = "tcp6";
2030 netid_len = 4;
2031 break;
2032 default:
2033 /* we only support tcp and tcp6 */
2034 WARN_ON_ONCE(1);
2035 return;
2036 }
2037
2038 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2039 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2040
2041 p = xdr_reserve_space(xdr, 4 + netid_len);
2042 xdr_encode_opaque(p, netid, netid_len);
2043
2044 p = xdr_reserve_space(xdr, 4 + len);
2045 xdr_encode_opaque(p, addrbuf, len);
2046 }
2047
2048 static void
2049 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2050 ktime_t t)
2051 {
2052 struct timespec64 ts;
2053 __be32 *p;
2054
2055 p = xdr_reserve_space(xdr, 12);
2056 ts = ktime_to_timespec64(t);
2057 p = xdr_encode_hyper(p, ts.tv_sec);
2058 *p++ = cpu_to_be32(ts.tv_nsec);
2059 }
2060
2061 static void
2062 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2063 struct nfs4_ff_io_stat *stat)
2064 {
2065 __be32 *p;
2066
2067 p = xdr_reserve_space(xdr, 5 * 8);
2068 p = xdr_encode_hyper(p, stat->ops_requested);
2069 p = xdr_encode_hyper(p, stat->bytes_requested);
2070 p = xdr_encode_hyper(p, stat->ops_completed);
2071 p = xdr_encode_hyper(p, stat->bytes_completed);
2072 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2073 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2074 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2075 }
2076
2077 static void
2078 ff_layout_encode_layoutstats(struct xdr_stream *xdr,
2079 struct nfs42_layoutstat_args *args,
2080 struct nfs42_layoutstat_devinfo *devinfo)
2081 {
2082 struct nfs4_ff_layout_mirror *mirror = devinfo->layout_private;
2083 struct nfs4_pnfs_ds_addr *da;
2084 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2085 struct nfs_fh *fh = &mirror->fh_versions[0];
2086 __be32 *p, *start;
2087
2088 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2089 dprintk("%s: DS %s: encoding address %s\n",
2090 __func__, ds->ds_remotestr, da->da_remotestr);
2091 /* layoutupdate length */
2092 start = xdr_reserve_space(xdr, 4);
2093 /* netaddr4 */
2094 ff_layout_encode_netaddr(xdr, da);
2095 /* nfs_fh4 */
2096 p = xdr_reserve_space(xdr, 4 + fh->size);
2097 xdr_encode_opaque(p, fh->data, fh->size);
2098 /* ff_io_latency4 read */
2099 spin_lock(&mirror->lock);
2100 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2101 /* ff_io_latency4 write */
2102 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2103 spin_unlock(&mirror->lock);
2104 /* nfstime4 */
2105 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2106 /* bool */
2107 p = xdr_reserve_space(xdr, 4);
2108 *p = cpu_to_be32(false);
2109
2110 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2111 }
2112
2113 static int
2114 ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
2115 struct pnfs_layout_hdr *lo,
2116 int dev_limit)
2117 {
2118 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2119 struct nfs4_ff_layout_mirror *mirror;
2120 struct nfs4_deviceid_node *dev;
2121 struct nfs42_layoutstat_devinfo *devinfo;
2122 int i = 0;
2123
2124 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2125 if (i >= dev_limit)
2126 break;
2127 if (!mirror->mirror_ds)
2128 continue;
2129 /* mirror refcount put in cleanup_layoutstats */
2130 if (!atomic_inc_not_zero(&mirror->ref))
2131 continue;
2132 dev = &mirror->mirror_ds->id_node;
2133 devinfo = &args->devinfo[i];
2134 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2135 devinfo->offset = 0;
2136 devinfo->length = NFS4_MAX_UINT64;
2137 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2138 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2139 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2140 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2141 devinfo->layout_type = LAYOUT_FLEX_FILES;
2142 devinfo->layoutstats_encode = ff_layout_encode_layoutstats;
2143 devinfo->layout_private = mirror;
2144
2145 i++;
2146 }
2147 return i;
2148 }
2149
2150 static int
2151 ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2152 {
2153 struct nfs4_flexfile_layout *ff_layout;
2154 struct nfs4_ff_layout_mirror *mirror;
2155 int dev_count = 0;
2156
2157 spin_lock(&args->inode->i_lock);
2158 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2159 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2160 if (atomic_read(&mirror->ref) != 0)
2161 dev_count ++;
2162 }
2163 spin_unlock(&args->inode->i_lock);
2164 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2165 if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
2166 dprintk("%s: truncating devinfo to limit (%d:%d)\n",
2167 __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
2168 dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2169 }
2170 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
2171 if (!args->devinfo)
2172 return -ENOMEM;
2173
2174 spin_lock(&args->inode->i_lock);
2175 args->num_dev = ff_layout_mirror_prepare_stats(args,
2176 &ff_layout->generic_hdr, dev_count);
2177 spin_unlock(&args->inode->i_lock);
2178
2179 return 0;
2180 }
2181
2182 static void
2183 ff_layout_cleanup_layoutstats(struct nfs42_layoutstat_data *data)
2184 {
2185 struct nfs4_ff_layout_mirror *mirror;
2186 int i;
2187
2188 for (i = 0; i < data->args.num_dev; i++) {
2189 mirror = data->args.devinfo[i].layout_private;
2190 data->args.devinfo[i].layout_private = NULL;
2191 ff_layout_put_mirror(mirror);
2192 }
2193 }
2194
2195 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2196 .id = LAYOUT_FLEX_FILES,
2197 .name = "LAYOUT_FLEX_FILES",
2198 .owner = THIS_MODULE,
2199 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2200 .free_layout_hdr = ff_layout_free_layout_hdr,
2201 .alloc_lseg = ff_layout_alloc_lseg,
2202 .free_lseg = ff_layout_free_lseg,
2203 .add_lseg = ff_layout_add_lseg,
2204 .pg_read_ops = &ff_layout_pg_read_ops,
2205 .pg_write_ops = &ff_layout_pg_write_ops,
2206 .get_ds_info = ff_layout_get_ds_info,
2207 .free_deviceid_node = ff_layout_free_deviceid_node,
2208 .mark_request_commit = pnfs_layout_mark_request_commit,
2209 .clear_request_commit = pnfs_generic_clear_request_commit,
2210 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2211 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2212 .commit_pagelist = ff_layout_commit_pagelist,
2213 .read_pagelist = ff_layout_read_pagelist,
2214 .write_pagelist = ff_layout_write_pagelist,
2215 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2216 .encode_layoutreturn = ff_layout_encode_layoutreturn,
2217 .sync = pnfs_nfs_generic_sync,
2218 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2219 .cleanup_layoutstats = ff_layout_cleanup_layoutstats,
2220 };
2221
2222 static int __init nfs4flexfilelayout_init(void)
2223 {
2224 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2225 __func__);
2226 return pnfs_register_layoutdriver(&flexfilelayout_type);
2227 }
2228
2229 static void __exit nfs4flexfilelayout_exit(void)
2230 {
2231 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2232 __func__);
2233 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2234 }
2235
2236 MODULE_ALIAS("nfs-layouttype4-4");
2237
2238 MODULE_LICENSE("GPL");
2239 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2240
2241 module_init(nfs4flexfilelayout_init);
2242 module_exit(nfs4flexfilelayout_exit);
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