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-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.c1574
1 files changed, 1574 insertions, 0 deletions
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
new file mode 100644
index 000000000000..c22ecaa86c1c
--- /dev/null
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -0,0 +1,1574 @@
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#include <linux/nfs_idmap.h>
15
16#include "flexfilelayout.h"
17#include "../nfs4session.h"
18#include "../internal.h"
19#include "../delegation.h"
20#include "../nfs4trace.h"
21#include "../iostat.h"
22#include "../nfs.h"
23
24#define NFSDBG_FACILITY NFSDBG_PNFS_LD
25
26#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
27
28static struct pnfs_layout_hdr *
29ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
30{
31 struct nfs4_flexfile_layout *ffl;
32
33 ffl = kzalloc(sizeof(*ffl), gfp_flags);
34 if (ffl) {
35 INIT_LIST_HEAD(&ffl->error_list);
36 return &ffl->generic_hdr;
37 } else
38 return NULL;
39}
40
41static void
42ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
43{
44 struct nfs4_ff_layout_ds_err *err, *n;
45
46 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
47 list) {
48 list_del(&err->list);
49 kfree(err);
50 }
51 kfree(FF_LAYOUT_FROM_HDR(lo));
52}
53
54static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
55{
56 __be32 *p;
57
58 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
59 if (unlikely(p == NULL))
60 return -ENOBUFS;
61 memcpy(stateid, p, NFS4_STATEID_SIZE);
62 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
63 p[0], p[1], p[2], p[3]);
64 return 0;
65}
66
67static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
68{
69 __be32 *p;
70
71 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
72 if (unlikely(!p))
73 return -ENOBUFS;
74 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
75 nfs4_print_deviceid(devid);
76 return 0;
77}
78
79static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
80{
81 __be32 *p;
82
83 p = xdr_inline_decode(xdr, 4);
84 if (unlikely(!p))
85 return -ENOBUFS;
86 fh->size = be32_to_cpup(p++);
87 if (fh->size > sizeof(struct nfs_fh)) {
88 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
89 fh->size);
90 return -EOVERFLOW;
91 }
92 /* fh.data */
93 p = xdr_inline_decode(xdr, fh->size);
94 if (unlikely(!p))
95 return -ENOBUFS;
96 memcpy(&fh->data, p, fh->size);
97 dprintk("%s: fh len %d\n", __func__, fh->size);
98
99 return 0;
100}
101
102/*
103 * Currently only stringified uids and gids are accepted.
104 * I.e., kerberos is not supported to the DSes, so no pricipals.
105 *
106 * That means that one common function will suffice, but when
107 * principals are added, this should be split to accomodate
108 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
109 */
110static int
111decode_name(struct xdr_stream *xdr, u32 *id)
112{
113 __be32 *p;
114 int len;
115
116 /* opaque_length(4)*/
117 p = xdr_inline_decode(xdr, 4);
118 if (unlikely(!p))
119 return -ENOBUFS;
120 len = be32_to_cpup(p++);
121 if (len < 0)
122 return -EINVAL;
123
124 dprintk("%s: len %u\n", __func__, len);
125
126 /* opaque body */
127 p = xdr_inline_decode(xdr, len);
128 if (unlikely(!p))
129 return -ENOBUFS;
130
131 if (!nfs_map_string_to_numeric((char *)p, len, id))
132 return -EINVAL;
133
134 return 0;
135}
136
137static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
138{
139 int i;
140
141 if (fls->mirror_array) {
142 for (i = 0; i < fls->mirror_array_cnt; i++) {
143 /* normally mirror_ds is freed in
144 * .free_deviceid_node but we still do it here
145 * for .alloc_lseg error path */
146 if (fls->mirror_array[i]) {
147 kfree(fls->mirror_array[i]->fh_versions);
148 nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
149 kfree(fls->mirror_array[i]);
150 }
151 }
152 kfree(fls->mirror_array);
153 fls->mirror_array = NULL;
154 }
155}
156
157static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
158{
159 int ret = 0;
160
161 dprintk("--> %s\n", __func__);
162
163 /* FIXME: remove this check when layout segment support is added */
164 if (lgr->range.offset != 0 ||
165 lgr->range.length != NFS4_MAX_UINT64) {
166 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
167 __func__);
168 ret = -EINVAL;
169 }
170
171 dprintk("--> %s returns %d\n", __func__, ret);
172 return ret;
173}
174
175static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
176{
177 if (fls) {
178 ff_layout_free_mirror_array(fls);
179 kfree(fls);
180 }
181}
182
183static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
184{
185 struct nfs4_ff_layout_mirror *tmp;
186 int i, j;
187
188 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
189 for (j = i + 1; j < fls->mirror_array_cnt; j++)
190 if (fls->mirror_array[i]->efficiency <
191 fls->mirror_array[j]->efficiency) {
192 tmp = fls->mirror_array[i];
193 fls->mirror_array[i] = fls->mirror_array[j];
194 fls->mirror_array[j] = tmp;
195 }
196 }
197}
198
199static struct pnfs_layout_segment *
200ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
201 struct nfs4_layoutget_res *lgr,
202 gfp_t gfp_flags)
203{
204 struct pnfs_layout_segment *ret;
205 struct nfs4_ff_layout_segment *fls = NULL;
206 struct xdr_stream stream;
207 struct xdr_buf buf;
208 struct page *scratch;
209 u64 stripe_unit;
210 u32 mirror_array_cnt;
211 __be32 *p;
212 int i, rc;
213
214 dprintk("--> %s\n", __func__);
215 scratch = alloc_page(gfp_flags);
216 if (!scratch)
217 return ERR_PTR(-ENOMEM);
218
219 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
220 lgr->layoutp->len);
221 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
222
223 /* stripe unit and mirror_array_cnt */
224 rc = -EIO;
225 p = xdr_inline_decode(&stream, 8 + 4);
226 if (!p)
227 goto out_err_free;
228
229 p = xdr_decode_hyper(p, &stripe_unit);
230 mirror_array_cnt = be32_to_cpup(p++);
231 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
232 stripe_unit, mirror_array_cnt);
233
234 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
235 mirror_array_cnt == 0)
236 goto out_err_free;
237
238 rc = -ENOMEM;
239 fls = kzalloc(sizeof(*fls), gfp_flags);
240 if (!fls)
241 goto out_err_free;
242
243 fls->mirror_array_cnt = mirror_array_cnt;
244 fls->stripe_unit = stripe_unit;
245 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
246 sizeof(fls->mirror_array[0]), gfp_flags);
247 if (fls->mirror_array == NULL)
248 goto out_err_free;
249
250 for (i = 0; i < fls->mirror_array_cnt; i++) {
251 struct nfs4_deviceid devid;
252 struct nfs4_deviceid_node *idnode;
253 u32 ds_count;
254 u32 fh_count;
255 int j;
256
257 rc = -EIO;
258 p = xdr_inline_decode(&stream, 4);
259 if (!p)
260 goto out_err_free;
261 ds_count = be32_to_cpup(p);
262
263 /* FIXME: allow for striping? */
264 if (ds_count != 1)
265 goto out_err_free;
266
267 fls->mirror_array[i] =
268 kzalloc(sizeof(struct nfs4_ff_layout_mirror),
269 gfp_flags);
270 if (fls->mirror_array[i] == NULL) {
271 rc = -ENOMEM;
272 goto out_err_free;
273 }
274
275 spin_lock_init(&fls->mirror_array[i]->lock);
276 fls->mirror_array[i]->ds_count = ds_count;
277
278 /* deviceid */
279 rc = decode_deviceid(&stream, &devid);
280 if (rc)
281 goto out_err_free;
282
283 idnode = nfs4_find_get_deviceid(NFS_SERVER(lh->plh_inode),
284 &devid, lh->plh_lc_cred,
285 gfp_flags);
286 /*
287 * upon success, mirror_ds is allocated by previous
288 * getdeviceinfo, or newly by .alloc_deviceid_node
289 * nfs4_find_get_deviceid failure is indeed getdeviceinfo falure
290 */
291 if (idnode)
292 fls->mirror_array[i]->mirror_ds =
293 FF_LAYOUT_MIRROR_DS(idnode);
294 else
295 goto out_err_free;
296
297 /* efficiency */
298 rc = -EIO;
299 p = xdr_inline_decode(&stream, 4);
300 if (!p)
301 goto out_err_free;
302 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
303
304 /* stateid */
305 rc = decode_stateid(&stream, &fls->mirror_array[i]->stateid);
306 if (rc)
307 goto out_err_free;
308
309 /* fh */
310 p = xdr_inline_decode(&stream, 4);
311 if (!p)
312 goto out_err_free;
313 fh_count = be32_to_cpup(p);
314
315 fls->mirror_array[i]->fh_versions =
316 kzalloc(fh_count * sizeof(struct nfs_fh),
317 gfp_flags);
318 if (fls->mirror_array[i]->fh_versions == NULL) {
319 rc = -ENOMEM;
320 goto out_err_free;
321 }
322
323 for (j = 0; j < fh_count; j++) {
324 rc = decode_nfs_fh(&stream,
325 &fls->mirror_array[i]->fh_versions[j]);
326 if (rc)
327 goto out_err_free;
328 }
329
330 fls->mirror_array[i]->fh_versions_cnt = fh_count;
331
332 /* user */
333 rc = decode_name(&stream, &fls->mirror_array[i]->uid);
334 if (rc)
335 goto out_err_free;
336
337 /* group */
338 rc = decode_name(&stream, &fls->mirror_array[i]->gid);
339 if (rc)
340 goto out_err_free;
341
342 dprintk("%s: uid %d gid %d\n", __func__,
343 fls->mirror_array[i]->uid,
344 fls->mirror_array[i]->gid);
345 }
346
347 ff_layout_sort_mirrors(fls);
348 rc = ff_layout_check_layout(lgr);
349 if (rc)
350 goto out_err_free;
351
352 ret = &fls->generic_hdr;
353 dprintk("<-- %s (success)\n", __func__);
354out_free_page:
355 __free_page(scratch);
356 return ret;
357out_err_free:
358 _ff_layout_free_lseg(fls);
359 ret = ERR_PTR(rc);
360 dprintk("<-- %s (%d)\n", __func__, rc);
361 goto out_free_page;
362}
363
364static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
365{
366 struct pnfs_layout_segment *lseg;
367
368 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
369 if (lseg->pls_range.iomode == IOMODE_RW)
370 return true;
371
372 return false;
373}
374
375static void
376ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
377{
378 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
379 int i;
380
381 dprintk("--> %s\n", __func__);
382
383 for (i = 0; i < fls->mirror_array_cnt; i++) {
384 if (fls->mirror_array[i]) {
385 nfs4_ff_layout_put_deviceid(fls->mirror_array[i]->mirror_ds);
386 fls->mirror_array[i]->mirror_ds = NULL;
387 if (fls->mirror_array[i]->cred) {
388 put_rpccred(fls->mirror_array[i]->cred);
389 fls->mirror_array[i]->cred = NULL;
390 }
391 }
392 }
393
394 if (lseg->pls_range.iomode == IOMODE_RW) {
395 struct nfs4_flexfile_layout *ffl;
396 struct inode *inode;
397
398 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
399 inode = ffl->generic_hdr.plh_inode;
400 spin_lock(&inode->i_lock);
401 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
402 ffl->commit_info.nbuckets = 0;
403 kfree(ffl->commit_info.buckets);
404 ffl->commit_info.buckets = NULL;
405 }
406 spin_unlock(&inode->i_lock);
407 }
408 _ff_layout_free_lseg(fls);
409}
410
411/* Return 1 until we have multiple lsegs support */
412static int
413ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
414{
415 return 1;
416}
417
418static int
419ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
420 struct nfs_commit_info *cinfo,
421 gfp_t gfp_flags)
422{
423 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
424 struct pnfs_commit_bucket *buckets;
425 int size;
426
427 if (cinfo->ds->nbuckets != 0) {
428 /* This assumes there is only one RW lseg per file.
429 * To support multiple lseg per file, we need to
430 * change struct pnfs_commit_bucket to allow dynamic
431 * increasing nbuckets.
432 */
433 return 0;
434 }
435
436 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
437
438 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
439 gfp_flags);
440 if (!buckets)
441 return -ENOMEM;
442 else {
443 int i;
444
445 spin_lock(cinfo->lock);
446 if (cinfo->ds->nbuckets != 0)
447 kfree(buckets);
448 else {
449 cinfo->ds->buckets = buckets;
450 cinfo->ds->nbuckets = size;
451 for (i = 0; i < size; i++) {
452 INIT_LIST_HEAD(&buckets[i].written);
453 INIT_LIST_HEAD(&buckets[i].committing);
454 /* mark direct verifier as unset */
455 buckets[i].direct_verf.committed =
456 NFS_INVALID_STABLE_HOW;
457 }
458 }
459 spin_unlock(cinfo->lock);
460 return 0;
461 }
462}
463
464static struct nfs4_pnfs_ds *
465ff_layout_choose_best_ds_for_read(struct nfs_pageio_descriptor *pgio,
466 int *best_idx)
467{
468 struct nfs4_ff_layout_segment *fls;
469 struct nfs4_pnfs_ds *ds;
470 int idx;
471
472 fls = FF_LAYOUT_LSEG(pgio->pg_lseg);
473 /* mirrors are sorted by efficiency */
474 for (idx = 0; idx < fls->mirror_array_cnt; idx++) {
475 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, idx, false);
476 if (ds) {
477 *best_idx = idx;
478 return ds;
479 }
480 }
481
482 return NULL;
483}
484
485static void
486ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
487 struct nfs_page *req)
488{
489 struct nfs_pgio_mirror *pgm;
490 struct nfs4_ff_layout_mirror *mirror;
491 struct nfs4_pnfs_ds *ds;
492 int ds_idx;
493
494 /* Use full layout for now */
495 if (!pgio->pg_lseg)
496 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
497 req->wb_context,
498 0,
499 NFS4_MAX_UINT64,
500 IOMODE_READ,
501 GFP_KERNEL);
502 /* If no lseg, fall back to read through mds */
503 if (pgio->pg_lseg == NULL)
504 goto out_mds;
505
506 ds = ff_layout_choose_best_ds_for_read(pgio, &ds_idx);
507 if (!ds)
508 goto out_mds;
509 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
510
511 pgio->pg_mirror_idx = ds_idx;
512
513 /* read always uses only one mirror - idx 0 for pgio layer */
514 pgm = &pgio->pg_mirrors[0];
515 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
516
517 return;
518out_mds:
519 pnfs_put_lseg(pgio->pg_lseg);
520 pgio->pg_lseg = NULL;
521 nfs_pageio_reset_read_mds(pgio);
522}
523
524static void
525ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
526 struct nfs_page *req)
527{
528 struct nfs4_ff_layout_mirror *mirror;
529 struct nfs_pgio_mirror *pgm;
530 struct nfs_commit_info cinfo;
531 struct nfs4_pnfs_ds *ds;
532 int i;
533 int status;
534
535 if (!pgio->pg_lseg)
536 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
537 req->wb_context,
538 0,
539 NFS4_MAX_UINT64,
540 IOMODE_RW,
541 GFP_NOFS);
542 /* If no lseg, fall back to write through mds */
543 if (pgio->pg_lseg == NULL)
544 goto out_mds;
545
546 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
547 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
548 if (status < 0)
549 goto out_mds;
550
551 /* Use a direct mapping of ds_idx to pgio mirror_idx */
552 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
553 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
554 goto out_mds;
555
556 for (i = 0; i < pgio->pg_mirror_count; i++) {
557 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, i, true);
558 if (!ds)
559 goto out_mds;
560 pgm = &pgio->pg_mirrors[i];
561 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
562 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
563 }
564
565 return;
566
567out_mds:
568 pnfs_put_lseg(pgio->pg_lseg);
569 pgio->pg_lseg = NULL;
570 nfs_pageio_reset_write_mds(pgio);
571}
572
573static unsigned int
574ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
575 struct nfs_page *req)
576{
577 if (!pgio->pg_lseg)
578 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
579 req->wb_context,
580 0,
581 NFS4_MAX_UINT64,
582 IOMODE_RW,
583 GFP_NOFS);
584 if (pgio->pg_lseg)
585 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
586
587 /* no lseg means that pnfs is not in use, so no mirroring here */
588 pnfs_put_lseg(pgio->pg_lseg);
589 pgio->pg_lseg = NULL;
590 nfs_pageio_reset_write_mds(pgio);
591 return 1;
592}
593
594static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
595 .pg_init = ff_layout_pg_init_read,
596 .pg_test = pnfs_generic_pg_test,
597 .pg_doio = pnfs_generic_pg_readpages,
598 .pg_cleanup = pnfs_generic_pg_cleanup,
599};
600
601static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
602 .pg_init = ff_layout_pg_init_write,
603 .pg_test = pnfs_generic_pg_test,
604 .pg_doio = pnfs_generic_pg_writepages,
605 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
606 .pg_cleanup = pnfs_generic_pg_cleanup,
607};
608
609static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
610{
611 struct rpc_task *task = &hdr->task;
612
613 pnfs_layoutcommit_inode(hdr->inode, false);
614
615 if (retry_pnfs) {
616 dprintk("%s Reset task %5u for i/o through pNFS "
617 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
618 hdr->task.tk_pid,
619 hdr->inode->i_sb->s_id,
620 (unsigned long long)NFS_FILEID(hdr->inode),
621 hdr->args.count,
622 (unsigned long long)hdr->args.offset);
623
624 if (!hdr->dreq) {
625 struct nfs_open_context *ctx;
626
627 ctx = nfs_list_entry(hdr->pages.next)->wb_context;
628 set_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
629 hdr->completion_ops->error_cleanup(&hdr->pages);
630 } else {
631 nfs_direct_set_resched_writes(hdr->dreq);
632 /* fake unstable write to let common nfs resend pages */
633 hdr->verf.committed = NFS_UNSTABLE;
634 hdr->good_bytes = 0;
635 }
636 return;
637 }
638
639 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
640 dprintk("%s Reset task %5u for i/o through MDS "
641 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
642 hdr->task.tk_pid,
643 hdr->inode->i_sb->s_id,
644 (unsigned long long)NFS_FILEID(hdr->inode),
645 hdr->args.count,
646 (unsigned long long)hdr->args.offset);
647
648 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
649 }
650}
651
652static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
653{
654 struct rpc_task *task = &hdr->task;
655
656 pnfs_layoutcommit_inode(hdr->inode, false);
657
658 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
659 dprintk("%s Reset task %5u for i/o through MDS "
660 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
661 hdr->task.tk_pid,
662 hdr->inode->i_sb->s_id,
663 (unsigned long long)NFS_FILEID(hdr->inode),
664 hdr->args.count,
665 (unsigned long long)hdr->args.offset);
666
667 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
668 }
669}
670
671static int ff_layout_async_handle_error_v4(struct rpc_task *task,
672 struct nfs4_state *state,
673 struct nfs_client *clp,
674 struct pnfs_layout_segment *lseg,
675 int idx)
676{
677 struct pnfs_layout_hdr *lo = lseg->pls_layout;
678 struct inode *inode = lo->plh_inode;
679 struct nfs_server *mds_server = NFS_SERVER(inode);
680
681 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
682 struct nfs_client *mds_client = mds_server->nfs_client;
683 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
684
685 if (task->tk_status >= 0)
686 return 0;
687
688 switch (task->tk_status) {
689 /* MDS state errors */
690 case -NFS4ERR_DELEG_REVOKED:
691 case -NFS4ERR_ADMIN_REVOKED:
692 case -NFS4ERR_BAD_STATEID:
693 if (state == NULL)
694 break;
695 nfs_remove_bad_delegation(state->inode);
696 case -NFS4ERR_OPENMODE:
697 if (state == NULL)
698 break;
699 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
700 goto out_bad_stateid;
701 goto wait_on_recovery;
702 case -NFS4ERR_EXPIRED:
703 if (state != NULL) {
704 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
705 goto out_bad_stateid;
706 }
707 nfs4_schedule_lease_recovery(mds_client);
708 goto wait_on_recovery;
709 /* DS session errors */
710 case -NFS4ERR_BADSESSION:
711 case -NFS4ERR_BADSLOT:
712 case -NFS4ERR_BAD_HIGH_SLOT:
713 case -NFS4ERR_DEADSESSION:
714 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
715 case -NFS4ERR_SEQ_FALSE_RETRY:
716 case -NFS4ERR_SEQ_MISORDERED:
717 dprintk("%s ERROR %d, Reset session. Exchangeid "
718 "flags 0x%x\n", __func__, task->tk_status,
719 clp->cl_exchange_flags);
720 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
721 break;
722 case -NFS4ERR_DELAY:
723 case -NFS4ERR_GRACE:
724 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
725 break;
726 case -NFS4ERR_RETRY_UNCACHED_REP:
727 break;
728 /* Invalidate Layout errors */
729 case -NFS4ERR_PNFS_NO_LAYOUT:
730 case -ESTALE: /* mapped NFS4ERR_STALE */
731 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
732 case -EISDIR: /* mapped NFS4ERR_ISDIR */
733 case -NFS4ERR_FHEXPIRED:
734 case -NFS4ERR_WRONG_TYPE:
735 dprintk("%s Invalid layout error %d\n", __func__,
736 task->tk_status);
737 /*
738 * Destroy layout so new i/o will get a new layout.
739 * Layout will not be destroyed until all current lseg
740 * references are put. Mark layout as invalid to resend failed
741 * i/o and all i/o waiting on the slot table to the MDS until
742 * layout is destroyed and a new valid layout is obtained.
743 */
744 pnfs_destroy_layout(NFS_I(inode));
745 rpc_wake_up(&tbl->slot_tbl_waitq);
746 goto reset;
747 /* RPC connection errors */
748 case -ECONNREFUSED:
749 case -EHOSTDOWN:
750 case -EHOSTUNREACH:
751 case -ENETUNREACH:
752 case -EIO:
753 case -ETIMEDOUT:
754 case -EPIPE:
755 dprintk("%s DS connection error %d\n", __func__,
756 task->tk_status);
757 nfs4_mark_deviceid_unavailable(devid);
758 rpc_wake_up(&tbl->slot_tbl_waitq);
759 /* fall through */
760 default:
761 if (ff_layout_has_available_ds(lseg))
762 return -NFS4ERR_RESET_TO_PNFS;
763reset:
764 dprintk("%s Retry through MDS. Error %d\n", __func__,
765 task->tk_status);
766 return -NFS4ERR_RESET_TO_MDS;
767 }
768out:
769 task->tk_status = 0;
770 return -EAGAIN;
771out_bad_stateid:
772 task->tk_status = -EIO;
773 return 0;
774wait_on_recovery:
775 rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
776 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
777 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
778 goto out;
779}
780
781/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
782static int ff_layout_async_handle_error_v3(struct rpc_task *task,
783 struct pnfs_layout_segment *lseg,
784 int idx)
785{
786 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
787
788 if (task->tk_status >= 0)
789 return 0;
790
791 if (task->tk_status != -EJUKEBOX) {
792 dprintk("%s DS connection error %d\n", __func__,
793 task->tk_status);
794 nfs4_mark_deviceid_unavailable(devid);
795 if (ff_layout_has_available_ds(lseg))
796 return -NFS4ERR_RESET_TO_PNFS;
797 else
798 return -NFS4ERR_RESET_TO_MDS;
799 }
800
801 if (task->tk_status == -EJUKEBOX)
802 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
803 task->tk_status = 0;
804 rpc_restart_call(task);
805 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
806 return -EAGAIN;
807}
808
809static int ff_layout_async_handle_error(struct rpc_task *task,
810 struct nfs4_state *state,
811 struct nfs_client *clp,
812 struct pnfs_layout_segment *lseg,
813 int idx)
814{
815 int vers = clp->cl_nfs_mod->rpc_vers->number;
816
817 switch (vers) {
818 case 3:
819 return ff_layout_async_handle_error_v3(task, lseg, idx);
820 case 4:
821 return ff_layout_async_handle_error_v4(task, state, clp,
822 lseg, idx);
823 default:
824 /* should never happen */
825 WARN_ON_ONCE(1);
826 return 0;
827 }
828}
829
830static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
831 int idx, u64 offset, u64 length,
832 u32 status, int opnum)
833{
834 struct nfs4_ff_layout_mirror *mirror;
835 int err;
836
837 mirror = FF_LAYOUT_COMP(lseg, idx);
838 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
839 mirror, offset, length, status, opnum,
840 GFP_NOIO);
841 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
842}
843
844/* NFS_PROTO call done callback routines */
845
846static int ff_layout_read_done_cb(struct rpc_task *task,
847 struct nfs_pgio_header *hdr)
848{
849 struct inode *inode;
850 int err;
851
852 trace_nfs4_pnfs_read(hdr, task->tk_status);
853 if (task->tk_status == -ETIMEDOUT && !hdr->res.op_status)
854 hdr->res.op_status = NFS4ERR_NXIO;
855 if (task->tk_status < 0 && hdr->res.op_status)
856 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
857 hdr->args.offset, hdr->args.count,
858 hdr->res.op_status, OP_READ);
859 err = ff_layout_async_handle_error(task, hdr->args.context->state,
860 hdr->ds_clp, hdr->lseg,
861 hdr->pgio_mirror_idx);
862
863 switch (err) {
864 case -NFS4ERR_RESET_TO_PNFS:
865 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
866 &hdr->lseg->pls_layout->plh_flags);
867 pnfs_read_resend_pnfs(hdr);
868 return task->tk_status;
869 case -NFS4ERR_RESET_TO_MDS:
870 inode = hdr->lseg->pls_layout->plh_inode;
871 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
872 ff_layout_reset_read(hdr);
873 return task->tk_status;
874 case -EAGAIN:
875 rpc_restart_call_prepare(task);
876 return -EAGAIN;
877 }
878
879 return 0;
880}
881
882/*
883 * We reference the rpc_cred of the first WRITE that triggers the need for
884 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
885 * rfc5661 is not clear about which credential should be used.
886 *
887 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
888 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
889 * we always send layoutcommit after DS writes.
890 */
891static void
892ff_layout_set_layoutcommit(struct nfs_pgio_header *hdr)
893{
894 pnfs_set_layoutcommit(hdr);
895 dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
896 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
897}
898
899static bool
900ff_layout_reset_to_mds(struct pnfs_layout_segment *lseg, int idx)
901{
902 /* No mirroring for now */
903 struct nfs4_deviceid_node *node = FF_LAYOUT_DEVID_NODE(lseg, idx);
904
905 return ff_layout_test_devid_unavailable(node);
906}
907
908static int ff_layout_read_prepare_common(struct rpc_task *task,
909 struct nfs_pgio_header *hdr)
910{
911 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
912 rpc_exit(task, -EIO);
913 return -EIO;
914 }
915 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
916 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
917 if (ff_layout_has_available_ds(hdr->lseg))
918 pnfs_read_resend_pnfs(hdr);
919 else
920 ff_layout_reset_read(hdr);
921 rpc_exit(task, 0);
922 return -EAGAIN;
923 }
924 hdr->pgio_done_cb = ff_layout_read_done_cb;
925
926 return 0;
927}
928
929/*
930 * Call ops for the async read/write cases
931 * In the case of dense layouts, the offset needs to be reset to its
932 * original value.
933 */
934static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
935{
936 struct nfs_pgio_header *hdr = data;
937
938 if (ff_layout_read_prepare_common(task, hdr))
939 return;
940
941 rpc_call_start(task);
942}
943
944static int ff_layout_setup_sequence(struct nfs_client *ds_clp,
945 struct nfs4_sequence_args *args,
946 struct nfs4_sequence_res *res,
947 struct rpc_task *task)
948{
949 if (ds_clp->cl_session)
950 return nfs41_setup_sequence(ds_clp->cl_session,
951 args,
952 res,
953 task);
954 return nfs40_setup_sequence(ds_clp->cl_slot_tbl,
955 args,
956 res,
957 task);
958}
959
960static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
961{
962 struct nfs_pgio_header *hdr = data;
963
964 if (ff_layout_read_prepare_common(task, hdr))
965 return;
966
967 if (ff_layout_setup_sequence(hdr->ds_clp,
968 &hdr->args.seq_args,
969 &hdr->res.seq_res,
970 task))
971 return;
972
973 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
974 hdr->args.lock_context, FMODE_READ) == -EIO)
975 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
976}
977
978static void ff_layout_read_call_done(struct rpc_task *task, void *data)
979{
980 struct nfs_pgio_header *hdr = data;
981
982 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
983
984 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
985 task->tk_status == 0) {
986 nfs4_sequence_done(task, &hdr->res.seq_res);
987 return;
988 }
989
990 /* Note this may cause RPC to be resent */
991 hdr->mds_ops->rpc_call_done(task, hdr);
992}
993
994static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
995{
996 struct nfs_pgio_header *hdr = data;
997
998 rpc_count_iostats_metrics(task,
999 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1000}
1001
1002static int ff_layout_write_done_cb(struct rpc_task *task,
1003 struct nfs_pgio_header *hdr)
1004{
1005 struct inode *inode;
1006 int err;
1007
1008 trace_nfs4_pnfs_write(hdr, task->tk_status);
1009 if (task->tk_status == -ETIMEDOUT && !hdr->res.op_status)
1010 hdr->res.op_status = NFS4ERR_NXIO;
1011 if (task->tk_status < 0 && hdr->res.op_status)
1012 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1013 hdr->args.offset, hdr->args.count,
1014 hdr->res.op_status, OP_WRITE);
1015 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1016 hdr->ds_clp, hdr->lseg,
1017 hdr->pgio_mirror_idx);
1018
1019 switch (err) {
1020 case -NFS4ERR_RESET_TO_PNFS:
1021 case -NFS4ERR_RESET_TO_MDS:
1022 inode = hdr->lseg->pls_layout->plh_inode;
1023 pnfs_error_mark_layout_for_return(inode, hdr->lseg);
1024 if (err == -NFS4ERR_RESET_TO_PNFS) {
1025 pnfs_set_retry_layoutget(hdr->lseg->pls_layout);
1026 ff_layout_reset_write(hdr, true);
1027 } else {
1028 pnfs_clear_retry_layoutget(hdr->lseg->pls_layout);
1029 ff_layout_reset_write(hdr, false);
1030 }
1031 return task->tk_status;
1032 case -EAGAIN:
1033 rpc_restart_call_prepare(task);
1034 return -EAGAIN;
1035 }
1036
1037 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1038 hdr->res.verf->committed == NFS_DATA_SYNC)
1039 ff_layout_set_layoutcommit(hdr);
1040
1041 return 0;
1042}
1043
1044static int ff_layout_commit_done_cb(struct rpc_task *task,
1045 struct nfs_commit_data *data)
1046{
1047 struct inode *inode;
1048 int err;
1049
1050 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
1051 if (task->tk_status == -ETIMEDOUT && !data->res.op_status)
1052 data->res.op_status = NFS4ERR_NXIO;
1053 if (task->tk_status < 0 && data->res.op_status)
1054 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1055 data->args.offset, data->args.count,
1056 data->res.op_status, OP_COMMIT);
1057 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1058 data->lseg, data->ds_commit_index);
1059
1060 switch (err) {
1061 case -NFS4ERR_RESET_TO_PNFS:
1062 case -NFS4ERR_RESET_TO_MDS:
1063 inode = data->lseg->pls_layout->plh_inode;
1064 pnfs_error_mark_layout_for_return(inode, data->lseg);
1065 if (err == -NFS4ERR_RESET_TO_PNFS)
1066 pnfs_set_retry_layoutget(data->lseg->pls_layout);
1067 else
1068 pnfs_clear_retry_layoutget(data->lseg->pls_layout);
1069 pnfs_generic_prepare_to_resend_writes(data);
1070 return -EAGAIN;
1071 case -EAGAIN:
1072 rpc_restart_call_prepare(task);
1073 return -EAGAIN;
1074 }
1075
1076 if (data->verf.committed == NFS_UNSTABLE)
1077 pnfs_commit_set_layoutcommit(data);
1078
1079 return 0;
1080}
1081
1082static int ff_layout_write_prepare_common(struct rpc_task *task,
1083 struct nfs_pgio_header *hdr)
1084{
1085 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1086 rpc_exit(task, -EIO);
1087 return -EIO;
1088 }
1089
1090 if (ff_layout_reset_to_mds(hdr->lseg, hdr->pgio_mirror_idx)) {
1091 bool retry_pnfs;
1092
1093 retry_pnfs = ff_layout_has_available_ds(hdr->lseg);
1094 dprintk("%s task %u reset io to %s\n", __func__,
1095 task->tk_pid, retry_pnfs ? "pNFS" : "MDS");
1096 ff_layout_reset_write(hdr, retry_pnfs);
1097 rpc_exit(task, 0);
1098 return -EAGAIN;
1099 }
1100
1101 return 0;
1102}
1103
1104static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1105{
1106 struct nfs_pgio_header *hdr = data;
1107
1108 if (ff_layout_write_prepare_common(task, hdr))
1109 return;
1110
1111 rpc_call_start(task);
1112}
1113
1114static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1115{
1116 struct nfs_pgio_header *hdr = data;
1117
1118 if (ff_layout_write_prepare_common(task, hdr))
1119 return;
1120
1121 if (ff_layout_setup_sequence(hdr->ds_clp,
1122 &hdr->args.seq_args,
1123 &hdr->res.seq_res,
1124 task))
1125 return;
1126
1127 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
1128 hdr->args.lock_context, FMODE_WRITE) == -EIO)
1129 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
1130}
1131
1132static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1133{
1134 struct nfs_pgio_header *hdr = data;
1135
1136 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1137 task->tk_status == 0) {
1138 nfs4_sequence_done(task, &hdr->res.seq_res);
1139 return;
1140 }
1141
1142 /* Note this may cause RPC to be resent */
1143 hdr->mds_ops->rpc_call_done(task, hdr);
1144}
1145
1146static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1147{
1148 struct nfs_pgio_header *hdr = data;
1149
1150 rpc_count_iostats_metrics(task,
1151 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1152}
1153
1154static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1155{
1156 rpc_call_start(task);
1157}
1158
1159static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1160{
1161 struct nfs_commit_data *wdata = data;
1162
1163 ff_layout_setup_sequence(wdata->ds_clp,
1164 &wdata->args.seq_args,
1165 &wdata->res.seq_res,
1166 task);
1167}
1168
1169static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1170{
1171 struct nfs_commit_data *cdata = data;
1172
1173 rpc_count_iostats_metrics(task,
1174 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1175}
1176
1177static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1178 .rpc_call_prepare = ff_layout_read_prepare_v3,
1179 .rpc_call_done = ff_layout_read_call_done,
1180 .rpc_count_stats = ff_layout_read_count_stats,
1181 .rpc_release = pnfs_generic_rw_release,
1182};
1183
1184static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1185 .rpc_call_prepare = ff_layout_read_prepare_v4,
1186 .rpc_call_done = ff_layout_read_call_done,
1187 .rpc_count_stats = ff_layout_read_count_stats,
1188 .rpc_release = pnfs_generic_rw_release,
1189};
1190
1191static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1192 .rpc_call_prepare = ff_layout_write_prepare_v3,
1193 .rpc_call_done = ff_layout_write_call_done,
1194 .rpc_count_stats = ff_layout_write_count_stats,
1195 .rpc_release = pnfs_generic_rw_release,
1196};
1197
1198static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1199 .rpc_call_prepare = ff_layout_write_prepare_v4,
1200 .rpc_call_done = ff_layout_write_call_done,
1201 .rpc_count_stats = ff_layout_write_count_stats,
1202 .rpc_release = pnfs_generic_rw_release,
1203};
1204
1205static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1206 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1207 .rpc_call_done = pnfs_generic_write_commit_done,
1208 .rpc_count_stats = ff_layout_commit_count_stats,
1209 .rpc_release = pnfs_generic_commit_release,
1210};
1211
1212static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1213 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1214 .rpc_call_done = pnfs_generic_write_commit_done,
1215 .rpc_count_stats = ff_layout_commit_count_stats,
1216 .rpc_release = pnfs_generic_commit_release,
1217};
1218
1219static enum pnfs_try_status
1220ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1221{
1222 struct pnfs_layout_segment *lseg = hdr->lseg;
1223 struct nfs4_pnfs_ds *ds;
1224 struct rpc_clnt *ds_clnt;
1225 struct rpc_cred *ds_cred;
1226 loff_t offset = hdr->args.offset;
1227 u32 idx = hdr->pgio_mirror_idx;
1228 int vers;
1229 struct nfs_fh *fh;
1230
1231 dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
1232 __func__, hdr->inode->i_ino,
1233 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1234
1235 ds = nfs4_ff_layout_prepare_ds(lseg, idx, false);
1236 if (!ds)
1237 goto out_failed;
1238
1239 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1240 hdr->inode);
1241 if (IS_ERR(ds_clnt))
1242 goto out_failed;
1243
1244 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1245 if (IS_ERR(ds_cred))
1246 goto out_failed;
1247
1248 vers = nfs4_ff_layout_ds_version(lseg, idx);
1249
1250 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1251 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count), vers);
1252
1253 atomic_inc(&ds->ds_clp->cl_count);
1254 hdr->ds_clp = ds->ds_clp;
1255 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1256 if (fh)
1257 hdr->args.fh = fh;
1258
1259 /*
1260 * Note that if we ever decide to split across DSes,
1261 * then we may need to handle dense-like offsets.
1262 */
1263 hdr->args.offset = offset;
1264 hdr->mds_offset = offset;
1265
1266 /* Perform an asynchronous read to ds */
1267 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1268 vers == 3 ? &ff_layout_read_call_ops_v3 :
1269 &ff_layout_read_call_ops_v4,
1270 0, RPC_TASK_SOFTCONN);
1271
1272 return PNFS_ATTEMPTED;
1273
1274out_failed:
1275 if (ff_layout_has_available_ds(lseg))
1276 return PNFS_TRY_AGAIN;
1277 return PNFS_NOT_ATTEMPTED;
1278}
1279
1280/* Perform async writes. */
1281static enum pnfs_try_status
1282ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1283{
1284 struct pnfs_layout_segment *lseg = hdr->lseg;
1285 struct nfs4_pnfs_ds *ds;
1286 struct rpc_clnt *ds_clnt;
1287 struct rpc_cred *ds_cred;
1288 loff_t offset = hdr->args.offset;
1289 int vers;
1290 struct nfs_fh *fh;
1291 int idx = hdr->pgio_mirror_idx;
1292
1293 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1294 if (!ds)
1295 return PNFS_NOT_ATTEMPTED;
1296
1297 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1298 hdr->inode);
1299 if (IS_ERR(ds_clnt))
1300 return PNFS_NOT_ATTEMPTED;
1301
1302 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
1303 if (IS_ERR(ds_cred))
1304 return PNFS_NOT_ATTEMPTED;
1305
1306 vers = nfs4_ff_layout_ds_version(lseg, idx);
1307
1308 dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d vers %d\n",
1309 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1310 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count),
1311 vers);
1312
1313 hdr->pgio_done_cb = ff_layout_write_done_cb;
1314 atomic_inc(&ds->ds_clp->cl_count);
1315 hdr->ds_clp = ds->ds_clp;
1316 hdr->ds_commit_idx = idx;
1317 fh = nfs4_ff_layout_select_ds_fh(lseg, idx);
1318 if (fh)
1319 hdr->args.fh = fh;
1320
1321 /*
1322 * Note that if we ever decide to split across DSes,
1323 * then we may need to handle dense-like offsets.
1324 */
1325 hdr->args.offset = offset;
1326
1327 /* Perform an asynchronous write */
1328 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1329 vers == 3 ? &ff_layout_write_call_ops_v3 :
1330 &ff_layout_write_call_ops_v4,
1331 sync, RPC_TASK_SOFTCONN);
1332 return PNFS_ATTEMPTED;
1333}
1334
1335static void
1336ff_layout_mark_request_commit(struct nfs_page *req,
1337 struct pnfs_layout_segment *lseg,
1338 struct nfs_commit_info *cinfo,
1339 u32 ds_commit_idx)
1340{
1341 struct list_head *list;
1342 struct pnfs_commit_bucket *buckets;
1343
1344 spin_lock(cinfo->lock);
1345 buckets = cinfo->ds->buckets;
1346 list = &buckets[ds_commit_idx].written;
1347 if (list_empty(list)) {
1348 /* Non-empty buckets hold a reference on the lseg. That ref
1349 * is normally transferred to the COMMIT call and released
1350 * there. It could also be released if the last req is pulled
1351 * off due to a rewrite, in which case it will be done in
1352 * pnfs_common_clear_request_commit
1353 */
1354 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL);
1355 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg);
1356 }
1357 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1358 cinfo->ds->nwritten++;
1359
1360 /* nfs_request_add_commit_list(). We need to add req to list without
1361 * dropping cinfo lock.
1362 */
1363 set_bit(PG_CLEAN, &(req)->wb_flags);
1364 nfs_list_add_request(req, list);
1365 cinfo->mds->ncommit++;
1366 spin_unlock(cinfo->lock);
1367 if (!cinfo->dreq) {
1368 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
1369 inc_bdi_stat(inode_to_bdi(page_file_mapping(req->wb_page)->host),
1370 BDI_RECLAIMABLE);
1371 __mark_inode_dirty(req->wb_context->dentry->d_inode,
1372 I_DIRTY_DATASYNC);
1373 }
1374}
1375
1376static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1377{
1378 return i;
1379}
1380
1381static struct nfs_fh *
1382select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1383{
1384 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1385
1386 /* FIXME: Assume that there is only one NFS version available
1387 * for the DS.
1388 */
1389 return &flseg->mirror_array[i]->fh_versions[0];
1390}
1391
1392static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1393{
1394 struct pnfs_layout_segment *lseg = data->lseg;
1395 struct nfs4_pnfs_ds *ds;
1396 struct rpc_clnt *ds_clnt;
1397 struct rpc_cred *ds_cred;
1398 u32 idx;
1399 int vers;
1400 struct nfs_fh *fh;
1401
1402 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1403 ds = nfs4_ff_layout_prepare_ds(lseg, idx, true);
1404 if (!ds)
1405 goto out_err;
1406
1407 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1408 data->inode);
1409 if (IS_ERR(ds_clnt))
1410 goto out_err;
1411
1412 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
1413 if (IS_ERR(ds_cred))
1414 goto out_err;
1415
1416 vers = nfs4_ff_layout_ds_version(lseg, idx);
1417
1418 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
1419 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count),
1420 vers);
1421 data->commit_done_cb = ff_layout_commit_done_cb;
1422 data->cred = ds_cred;
1423 atomic_inc(&ds->ds_clp->cl_count);
1424 data->ds_clp = ds->ds_clp;
1425 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1426 if (fh)
1427 data->args.fh = fh;
1428 return nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
1429 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1430 &ff_layout_commit_call_ops_v4,
1431 how, RPC_TASK_SOFTCONN);
1432out_err:
1433 pnfs_generic_prepare_to_resend_writes(data);
1434 pnfs_generic_commit_release(data);
1435 return -EAGAIN;
1436}
1437
1438static int
1439ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1440 int how, struct nfs_commit_info *cinfo)
1441{
1442 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1443 ff_layout_initiate_commit);
1444}
1445
1446static struct pnfs_ds_commit_info *
1447ff_layout_get_ds_info(struct inode *inode)
1448{
1449 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1450
1451 if (layout == NULL)
1452 return NULL;
1453
1454 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1455}
1456
1457static void
1458ff_layout_free_deveiceid_node(struct nfs4_deviceid_node *d)
1459{
1460 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1461 id_node));
1462}
1463
1464static int ff_layout_encode_ioerr(struct nfs4_flexfile_layout *flo,
1465 struct xdr_stream *xdr,
1466 const struct nfs4_layoutreturn_args *args)
1467{
1468 struct pnfs_layout_hdr *hdr = &flo->generic_hdr;
1469 __be32 *start;
1470 int count = 0, ret = 0;
1471
1472 start = xdr_reserve_space(xdr, 4);
1473 if (unlikely(!start))
1474 return -E2BIG;
1475
1476 /* This assume we always return _ALL_ layouts */
1477 spin_lock(&hdr->plh_inode->i_lock);
1478 ret = ff_layout_encode_ds_ioerr(flo, xdr, &count, &args->range);
1479 spin_unlock(&hdr->plh_inode->i_lock);
1480
1481 *start = cpu_to_be32(count);
1482
1483 return ret;
1484}
1485
1486/* report nothing for now */
1487static void ff_layout_encode_iostats(struct nfs4_flexfile_layout *flo,
1488 struct xdr_stream *xdr,
1489 const struct nfs4_layoutreturn_args *args)
1490{
1491 __be32 *p;
1492
1493 p = xdr_reserve_space(xdr, 4);
1494 if (likely(p))
1495 *p = cpu_to_be32(0);
1496}
1497
1498static struct nfs4_deviceid_node *
1499ff_layout_alloc_deviceid_node(struct nfs_server *server,
1500 struct pnfs_device *pdev, gfp_t gfp_flags)
1501{
1502 struct nfs4_ff_layout_ds *dsaddr;
1503
1504 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
1505 if (!dsaddr)
1506 return NULL;
1507 return &dsaddr->id_node;
1508}
1509
1510static void
1511ff_layout_encode_layoutreturn(struct pnfs_layout_hdr *lo,
1512 struct xdr_stream *xdr,
1513 const struct nfs4_layoutreturn_args *args)
1514{
1515 struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo);
1516 __be32 *start;
1517
1518 dprintk("%s: Begin\n", __func__);
1519 start = xdr_reserve_space(xdr, 4);
1520 BUG_ON(!start);
1521
1522 if (ff_layout_encode_ioerr(flo, xdr, args))
1523 goto out;
1524
1525 ff_layout_encode_iostats(flo, xdr, args);
1526out:
1527 *start = cpu_to_be32((xdr->p - start - 1) * 4);
1528 dprintk("%s: Return\n", __func__);
1529}
1530
1531static struct pnfs_layoutdriver_type flexfilelayout_type = {
1532 .id = LAYOUT_FLEX_FILES,
1533 .name = "LAYOUT_FLEX_FILES",
1534 .owner = THIS_MODULE,
1535 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
1536 .free_layout_hdr = ff_layout_free_layout_hdr,
1537 .alloc_lseg = ff_layout_alloc_lseg,
1538 .free_lseg = ff_layout_free_lseg,
1539 .pg_read_ops = &ff_layout_pg_read_ops,
1540 .pg_write_ops = &ff_layout_pg_write_ops,
1541 .get_ds_info = ff_layout_get_ds_info,
1542 .free_deviceid_node = ff_layout_free_deveiceid_node,
1543 .mark_request_commit = ff_layout_mark_request_commit,
1544 .clear_request_commit = pnfs_generic_clear_request_commit,
1545 .scan_commit_lists = pnfs_generic_scan_commit_lists,
1546 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
1547 .commit_pagelist = ff_layout_commit_pagelist,
1548 .read_pagelist = ff_layout_read_pagelist,
1549 .write_pagelist = ff_layout_write_pagelist,
1550 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
1551 .encode_layoutreturn = ff_layout_encode_layoutreturn,
1552};
1553
1554static int __init nfs4flexfilelayout_init(void)
1555{
1556 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
1557 __func__);
1558 return pnfs_register_layoutdriver(&flexfilelayout_type);
1559}
1560
1561static void __exit nfs4flexfilelayout_exit(void)
1562{
1563 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
1564 __func__);
1565 pnfs_unregister_layoutdriver(&flexfilelayout_type);
1566}
1567
1568MODULE_ALIAS("nfs-layouttype4-4");
1569
1570MODULE_LICENSE("GPL");
1571MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
1572
1573module_init(nfs4flexfilelayout_init);
1574module_exit(nfs4flexfilelayout_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-20 11:18:20 -0500