1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Module for pnfs flexfile layout driver.
4 *
5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6 *
7 * Tao Peng <bergwolf@primarydata.com>
8 */
9
10 #include <linux/nfs_fs.h>
11 #include <linux/nfs_mount.h>
12 #include <linux/nfs_page.h>
13 #include <linux/module.h>
14 #include <linux/file.h>
15 #include <linux/sched/mm.h>
16
17 #include <linux/sunrpc/metrics.h>
18
19 #include "flexfilelayout.h"
20 #include "../nfs4session.h"
21 #include "../nfs4idmap.h"
22 #include "../internal.h"
23 #include "../delegation.h"
24 #include "../nfs4trace.h"
25 #include "../iostat.h"
26 #include "../nfs.h"
27 #include "../nfs42.h"
28
29 #define NFSDBG_FACILITY NFSDBG_PNFS_LD
30
31 #define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
32 #define FF_LAYOUTRETURN_MAXERR 20
33
34 enum nfs4_ff_op_type {
35 NFS4_FF_OP_LAYOUTSTATS,
36 NFS4_FF_OP_LAYOUTRETURN,
37 };
38
39 static unsigned short io_maxretrans;
40
41 static const struct pnfs_commit_ops ff_layout_commit_ops;
42 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
43 struct nfs_pgio_header *hdr);
44 static int
45 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
46 struct nfs42_layoutstat_devinfo *devinfo,
47 int dev_limit, enum nfs4_ff_op_type type);
48 static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
49 const struct nfs42_layoutstat_devinfo *devinfo,
50 struct nfs4_ff_layout_mirror *mirror);
51
52 static struct pnfs_layout_hdr *
ff_layout_alloc_layout_hdr(struct inode * inode,gfp_t gfp_flags)53 ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
54 {
55 struct nfs4_flexfile_layout *ffl;
56
57 ffl = kzalloc(sizeof(*ffl), gfp_flags);
58 if (ffl) {
59 pnfs_init_ds_commit_info(&ffl->commit_info);
60 INIT_LIST_HEAD(&ffl->error_list);
61 INIT_LIST_HEAD(&ffl->mirrors);
62 ffl->last_report_time = ktime_get();
63 ffl->commit_info.ops = &ff_layout_commit_ops;
64 return &ffl->generic_hdr;
65 } else
66 return NULL;
67 }
68
69 static void
ff_layout_free_layout_hdr(struct pnfs_layout_hdr * lo)70 ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
71 {
72 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(lo);
73 struct nfs4_ff_layout_ds_err *err, *n;
74
75 list_for_each_entry_safe(err, n, &ffl->error_list, list) {
76 list_del(&err->list);
77 kfree(err);
78 }
79 kfree_rcu(ffl, generic_hdr.plh_rcu);
80 }
81
decode_pnfs_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)82 static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
83 {
84 __be32 *p;
85
86 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
87 if (unlikely(p == NULL))
88 return -ENOBUFS;
89 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
90 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
91 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
92 p[0], p[1], p[2], p[3]);
93 return 0;
94 }
95
decode_deviceid(struct xdr_stream * xdr,struct nfs4_deviceid * devid)96 static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
97 {
98 __be32 *p;
99
100 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
101 if (unlikely(!p))
102 return -ENOBUFS;
103 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
104 nfs4_print_deviceid(devid);
105 return 0;
106 }
107
decode_nfs_fh(struct xdr_stream * xdr,struct nfs_fh * fh)108 static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
109 {
110 __be32 *p;
111
112 p = xdr_inline_decode(xdr, 4);
113 if (unlikely(!p))
114 return -ENOBUFS;
115 fh->size = be32_to_cpup(p++);
116 if (fh->size > NFS_MAXFHSIZE) {
117 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
118 fh->size);
119 return -EOVERFLOW;
120 }
121 /* fh.data */
122 p = xdr_inline_decode(xdr, fh->size);
123 if (unlikely(!p))
124 return -ENOBUFS;
125 memcpy(&fh->data, p, fh->size);
126 dprintk("%s: fh len %d\n", __func__, fh->size);
127
128 return 0;
129 }
130
131 /*
132 * Currently only stringified uids and gids are accepted.
133 * I.e., kerberos is not supported to the DSes, so no pricipals.
134 *
135 * That means that one common function will suffice, but when
136 * principals are added, this should be split to accomodate
137 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
138 */
139 static int
decode_name(struct xdr_stream * xdr,u32 * id)140 decode_name(struct xdr_stream *xdr, u32 *id)
141 {
142 __be32 *p;
143 int len;
144
145 /* opaque_length(4)*/
146 p = xdr_inline_decode(xdr, 4);
147 if (unlikely(!p))
148 return -ENOBUFS;
149 len = be32_to_cpup(p++);
150 if (len < 0)
151 return -EINVAL;
152
153 dprintk("%s: len %u\n", __func__, len);
154
155 /* opaque body */
156 p = xdr_inline_decode(xdr, len);
157 if (unlikely(!p))
158 return -ENOBUFS;
159
160 if (!nfs_map_string_to_numeric((char *)p, len, id))
161 return -EINVAL;
162
163 return 0;
164 }
165
166 static struct nfsd_file *
ff_local_open_fh(struct pnfs_layout_segment * lseg,u32 ds_idx,struct nfs_client * clp,const struct cred * cred,struct nfs_fh * fh,fmode_t mode)167 ff_local_open_fh(struct pnfs_layout_segment *lseg, u32 ds_idx,
168 struct nfs_client *clp, const struct cred *cred,
169 struct nfs_fh *fh, fmode_t mode)
170 {
171 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
172 struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
173
174 return nfs_local_open_fh(clp, cred, fh, &mirror->nfl, mode);
175 #else
176 return NULL;
177 #endif
178 }
179
ff_mirror_match_fh(const struct nfs4_ff_layout_mirror * m1,const struct nfs4_ff_layout_mirror * m2)180 static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
181 const struct nfs4_ff_layout_mirror *m2)
182 {
183 int i, j;
184
185 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
186 return false;
187 for (i = 0; i < m1->fh_versions_cnt; i++) {
188 bool found_fh = false;
189 for (j = 0; j < m2->fh_versions_cnt; j++) {
190 if (nfs_compare_fh(&m1->fh_versions[i],
191 &m2->fh_versions[j]) == 0) {
192 found_fh = true;
193 break;
194 }
195 }
196 if (!found_fh)
197 return false;
198 }
199 return true;
200 }
201
202 static struct nfs4_ff_layout_mirror *
ff_layout_add_mirror(struct pnfs_layout_hdr * lo,struct nfs4_ff_layout_mirror * mirror)203 ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
204 struct nfs4_ff_layout_mirror *mirror)
205 {
206 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
207 struct nfs4_ff_layout_mirror *pos;
208 struct inode *inode = lo->plh_inode;
209
210 spin_lock(&inode->i_lock);
211 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
212 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
213 continue;
214 if (!ff_mirror_match_fh(mirror, pos))
215 continue;
216 if (refcount_inc_not_zero(&pos->ref)) {
217 spin_unlock(&inode->i_lock);
218 return pos;
219 }
220 }
221 list_add(&mirror->mirrors, &ff_layout->mirrors);
222 mirror->layout = lo;
223 spin_unlock(&inode->i_lock);
224 return mirror;
225 }
226
227 static void
ff_layout_remove_mirror(struct nfs4_ff_layout_mirror * mirror)228 ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
229 {
230 struct inode *inode;
231 if (mirror->layout == NULL)
232 return;
233 inode = mirror->layout->plh_inode;
234 spin_lock(&inode->i_lock);
235 list_del(&mirror->mirrors);
236 spin_unlock(&inode->i_lock);
237 mirror->layout = NULL;
238 }
239
ff_layout_alloc_mirror(gfp_t gfp_flags)240 static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
241 {
242 struct nfs4_ff_layout_mirror *mirror;
243
244 mirror = kzalloc(sizeof(*mirror), gfp_flags);
245 if (mirror != NULL) {
246 spin_lock_init(&mirror->lock);
247 refcount_set(&mirror->ref, 1);
248 INIT_LIST_HEAD(&mirror->mirrors);
249 nfs_localio_file_init(&mirror->nfl);
250 }
251 return mirror;
252 }
253
ff_layout_free_mirror(struct nfs4_ff_layout_mirror * mirror)254 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
255 {
256 const struct cred *cred;
257
258 ff_layout_remove_mirror(mirror);
259 kfree(mirror->fh_versions);
260 nfs_close_local_fh(&mirror->nfl);
261 cred = rcu_access_pointer(mirror->ro_cred);
262 put_cred(cred);
263 cred = rcu_access_pointer(mirror->rw_cred);
264 put_cred(cred);
265 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
266 kfree(mirror);
267 }
268
ff_layout_put_mirror(struct nfs4_ff_layout_mirror * mirror)269 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
270 {
271 if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
272 ff_layout_free_mirror(mirror);
273 }
274
ff_layout_free_mirror_array(struct nfs4_ff_layout_segment * fls)275 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
276 {
277 u32 i;
278
279 for (i = 0; i < fls->mirror_array_cnt; i++)
280 ff_layout_put_mirror(fls->mirror_array[i]);
281 }
282
_ff_layout_free_lseg(struct nfs4_ff_layout_segment * fls)283 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
284 {
285 if (fls) {
286 ff_layout_free_mirror_array(fls);
287 kfree(fls);
288 }
289 }
290
291 static bool
ff_lseg_match_mirrors(struct pnfs_layout_segment * l1,struct pnfs_layout_segment * l2)292 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1,
293 struct pnfs_layout_segment *l2)
294 {
295 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1);
296 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l1);
297 u32 i;
298
299 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt)
300 return false;
301 for (i = 0; i < fl1->mirror_array_cnt; i++) {
302 if (fl1->mirror_array[i] != fl2->mirror_array[i])
303 return false;
304 }
305 return true;
306 }
307
308 static bool
ff_lseg_range_is_after(const struct pnfs_layout_range * l1,const struct pnfs_layout_range * l2)309 ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
310 const struct pnfs_layout_range *l2)
311 {
312 u64 end1, end2;
313
314 if (l1->iomode != l2->iomode)
315 return l1->iomode != IOMODE_READ;
316 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
317 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
318 if (end1 < l2->offset)
319 return false;
320 if (end2 < l1->offset)
321 return true;
322 return l2->offset <= l1->offset;
323 }
324
325 static bool
ff_lseg_merge(struct pnfs_layout_segment * new,struct pnfs_layout_segment * old)326 ff_lseg_merge(struct pnfs_layout_segment *new,
327 struct pnfs_layout_segment *old)
328 {
329 u64 new_end, old_end;
330
331 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
332 return false;
333 if (new->pls_range.iomode != old->pls_range.iomode)
334 return false;
335 old_end = pnfs_calc_offset_end(old->pls_range.offset,
336 old->pls_range.length);
337 if (old_end < new->pls_range.offset)
338 return false;
339 new_end = pnfs_calc_offset_end(new->pls_range.offset,
340 new->pls_range.length);
341 if (new_end < old->pls_range.offset)
342 return false;
343 if (!ff_lseg_match_mirrors(new, old))
344 return false;
345
346 /* Mergeable: copy info from 'old' to 'new' */
347 if (new_end < old_end)
348 new_end = old_end;
349 if (new->pls_range.offset < old->pls_range.offset)
350 new->pls_range.offset = old->pls_range.offset;
351 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
352 new_end);
353 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
354 set_bit(NFS_LSEG_ROC, &new->pls_flags);
355 return true;
356 }
357
358 static void
ff_layout_add_lseg(struct pnfs_layout_hdr * lo,struct pnfs_layout_segment * lseg,struct list_head * free_me)359 ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
360 struct pnfs_layout_segment *lseg,
361 struct list_head *free_me)
362 {
363 pnfs_generic_layout_insert_lseg(lo, lseg,
364 ff_lseg_range_is_after,
365 ff_lseg_merge,
366 free_me);
367 }
368
ff_layout_sort_mirrors(struct nfs4_ff_layout_segment * fls)369 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
370 {
371 int i, j;
372
373 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
374 for (j = i + 1; j < fls->mirror_array_cnt; j++)
375 if (fls->mirror_array[i]->efficiency <
376 fls->mirror_array[j]->efficiency)
377 swap(fls->mirror_array[i],
378 fls->mirror_array[j]);
379 }
380 }
381
382 static struct pnfs_layout_segment *
ff_layout_alloc_lseg(struct pnfs_layout_hdr * lh,struct nfs4_layoutget_res * lgr,gfp_t gfp_flags)383 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
384 struct nfs4_layoutget_res *lgr,
385 gfp_t gfp_flags)
386 {
387 struct pnfs_layout_segment *ret;
388 struct nfs4_ff_layout_segment *fls = NULL;
389 struct xdr_stream stream;
390 struct xdr_buf buf;
391 struct page *scratch;
392 u64 stripe_unit;
393 u32 mirror_array_cnt;
394 __be32 *p;
395 int i, rc;
396
397 dprintk("--> %s\n", __func__);
398 scratch = alloc_page(gfp_flags);
399 if (!scratch)
400 return ERR_PTR(-ENOMEM);
401
402 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
403 lgr->layoutp->len);
404 xdr_set_scratch_page(&stream, scratch);
405
406 /* stripe unit and mirror_array_cnt */
407 rc = -EIO;
408 p = xdr_inline_decode(&stream, 8 + 4);
409 if (!p)
410 goto out_err_free;
411
412 p = xdr_decode_hyper(p, &stripe_unit);
413 mirror_array_cnt = be32_to_cpup(p++);
414 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
415 stripe_unit, mirror_array_cnt);
416
417 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
418 mirror_array_cnt == 0)
419 goto out_err_free;
420
421 rc = -ENOMEM;
422 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt),
423 gfp_flags);
424 if (!fls)
425 goto out_err_free;
426
427 fls->mirror_array_cnt = mirror_array_cnt;
428 fls->stripe_unit = stripe_unit;
429
430 for (i = 0; i < fls->mirror_array_cnt; i++) {
431 struct nfs4_ff_layout_mirror *mirror;
432 struct cred *kcred;
433 const struct cred __rcu *cred;
434 kuid_t uid;
435 kgid_t gid;
436 u32 ds_count, fh_count, id;
437 int j;
438
439 rc = -EIO;
440 p = xdr_inline_decode(&stream, 4);
441 if (!p)
442 goto out_err_free;
443 ds_count = be32_to_cpup(p);
444
445 /* FIXME: allow for striping? */
446 if (ds_count != 1)
447 goto out_err_free;
448
449 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
450 if (fls->mirror_array[i] == NULL) {
451 rc = -ENOMEM;
452 goto out_err_free;
453 }
454
455 fls->mirror_array[i]->ds_count = ds_count;
456
457 /* deviceid */
458 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
459 if (rc)
460 goto out_err_free;
461
462 /* efficiency */
463 rc = -EIO;
464 p = xdr_inline_decode(&stream, 4);
465 if (!p)
466 goto out_err_free;
467 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
468
469 /* stateid */
470 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
471 if (rc)
472 goto out_err_free;
473
474 /* fh */
475 rc = -EIO;
476 p = xdr_inline_decode(&stream, 4);
477 if (!p)
478 goto out_err_free;
479 fh_count = be32_to_cpup(p);
480
481 fls->mirror_array[i]->fh_versions =
482 kcalloc(fh_count, sizeof(struct nfs_fh),
483 gfp_flags);
484 if (fls->mirror_array[i]->fh_versions == NULL) {
485 rc = -ENOMEM;
486 goto out_err_free;
487 }
488
489 for (j = 0; j < fh_count; j++) {
490 rc = decode_nfs_fh(&stream,
491 &fls->mirror_array[i]->fh_versions[j]);
492 if (rc)
493 goto out_err_free;
494 }
495
496 fls->mirror_array[i]->fh_versions_cnt = fh_count;
497
498 /* user */
499 rc = decode_name(&stream, &id);
500 if (rc)
501 goto out_err_free;
502
503 uid = make_kuid(&init_user_ns, id);
504
505 /* group */
506 rc = decode_name(&stream, &id);
507 if (rc)
508 goto out_err_free;
509
510 gid = make_kgid(&init_user_ns, id);
511
512 if (gfp_flags & __GFP_FS)
513 kcred = prepare_kernel_cred(&init_task);
514 else {
515 unsigned int nofs_flags = memalloc_nofs_save();
516 kcred = prepare_kernel_cred(&init_task);
517 memalloc_nofs_restore(nofs_flags);
518 }
519 rc = -ENOMEM;
520 if (!kcred)
521 goto out_err_free;
522 kcred->fsuid = uid;
523 kcred->fsgid = gid;
524 cred = RCU_INITIALIZER(kcred);
525
526 if (lgr->range.iomode == IOMODE_READ)
527 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
528 else
529 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
530
531 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
532 if (mirror != fls->mirror_array[i]) {
533 /* swap cred ptrs so free_mirror will clean up old */
534 if (lgr->range.iomode == IOMODE_READ) {
535 cred = xchg(&mirror->ro_cred, cred);
536 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
537 } else {
538 cred = xchg(&mirror->rw_cred, cred);
539 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
540 }
541 ff_layout_free_mirror(fls->mirror_array[i]);
542 fls->mirror_array[i] = mirror;
543 }
544
545 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
546 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
547 from_kuid(&init_user_ns, uid),
548 from_kgid(&init_user_ns, gid));
549 }
550
551 p = xdr_inline_decode(&stream, 4);
552 if (!p)
553 goto out_sort_mirrors;
554 fls->flags = be32_to_cpup(p);
555
556 p = xdr_inline_decode(&stream, 4);
557 if (!p)
558 goto out_sort_mirrors;
559 for (i=0; i < fls->mirror_array_cnt; i++)
560 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
561
562 out_sort_mirrors:
563 ff_layout_sort_mirrors(fls);
564 ret = &fls->generic_hdr;
565 dprintk("<-- %s (success)\n", __func__);
566 out_free_page:
567 __free_page(scratch);
568 return ret;
569 out_err_free:
570 _ff_layout_free_lseg(fls);
571 ret = ERR_PTR(rc);
572 dprintk("<-- %s (%d)\n", __func__, rc);
573 goto out_free_page;
574 }
575
576 static void
ff_layout_free_lseg(struct pnfs_layout_segment * lseg)577 ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
578 {
579 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
580
581 dprintk("--> %s\n", __func__);
582
583 if (lseg->pls_range.iomode == IOMODE_RW) {
584 struct nfs4_flexfile_layout *ffl;
585 struct inode *inode;
586
587 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
588 inode = ffl->generic_hdr.plh_inode;
589 spin_lock(&inode->i_lock);
590 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg);
591 spin_unlock(&inode->i_lock);
592 }
593 _ff_layout_free_lseg(fls);
594 }
595
596 static void
nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer * timer,ktime_t now)597 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
598 {
599 /* first IO request? */
600 if (atomic_inc_return(&timer->n_ops) == 1) {
601 timer->start_time = now;
602 }
603 }
604
605 static ktime_t
nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer * timer,ktime_t now)606 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
607 {
608 ktime_t start;
609
610 if (atomic_dec_return(&timer->n_ops) < 0)
611 WARN_ON_ONCE(1);
612
613 start = timer->start_time;
614 timer->start_time = now;
615 return ktime_sub(now, start);
616 }
617
618 static bool
nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror * mirror,struct nfs4_ff_layoutstat * layoutstat,ktime_t now)619 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
620 struct nfs4_ff_layoutstat *layoutstat,
621 ktime_t now)
622 {
623 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
624 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
625
626 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
627 if (!mirror->start_time)
628 mirror->start_time = now;
629 if (mirror->report_interval != 0)
630 report_interval = (s64)mirror->report_interval * 1000LL;
631 else if (layoutstats_timer != 0)
632 report_interval = (s64)layoutstats_timer * 1000LL;
633 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
634 report_interval) {
635 ffl->last_report_time = now;
636 return true;
637 }
638
639 return false;
640 }
641
642 static void
nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat * layoutstat,__u64 requested)643 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
644 __u64 requested)
645 {
646 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
647
648 iostat->ops_requested++;
649 iostat->bytes_requested += requested;
650 }
651
652 static void
nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat * layoutstat,__u64 requested,__u64 completed,ktime_t time_completed,ktime_t time_started)653 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
654 __u64 requested,
655 __u64 completed,
656 ktime_t time_completed,
657 ktime_t time_started)
658 {
659 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
660 ktime_t completion_time = ktime_sub(time_completed, time_started);
661 ktime_t timer;
662
663 iostat->ops_completed++;
664 iostat->bytes_completed += completed;
665 iostat->bytes_not_delivered += requested - completed;
666
667 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
668 iostat->total_busy_time =
669 ktime_add(iostat->total_busy_time, timer);
670 iostat->aggregate_completion_time =
671 ktime_add(iostat->aggregate_completion_time,
672 completion_time);
673 }
674
675 static void
nfs4_ff_layout_stat_io_start_read(struct inode * inode,struct nfs4_ff_layout_mirror * mirror,__u64 requested,ktime_t now)676 nfs4_ff_layout_stat_io_start_read(struct inode *inode,
677 struct nfs4_ff_layout_mirror *mirror,
678 __u64 requested, ktime_t now)
679 {
680 bool report;
681
682 spin_lock(&mirror->lock);
683 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
684 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
685 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
686 spin_unlock(&mirror->lock);
687
688 if (report)
689 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
690 }
691
692 static void
nfs4_ff_layout_stat_io_end_read(struct rpc_task * task,struct nfs4_ff_layout_mirror * mirror,__u64 requested,__u64 completed)693 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
694 struct nfs4_ff_layout_mirror *mirror,
695 __u64 requested,
696 __u64 completed)
697 {
698 spin_lock(&mirror->lock);
699 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
700 requested, completed,
701 ktime_get(), task->tk_start);
702 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
703 spin_unlock(&mirror->lock);
704 }
705
706 static void
nfs4_ff_layout_stat_io_start_write(struct inode * inode,struct nfs4_ff_layout_mirror * mirror,__u64 requested,ktime_t now)707 nfs4_ff_layout_stat_io_start_write(struct inode *inode,
708 struct nfs4_ff_layout_mirror *mirror,
709 __u64 requested, ktime_t now)
710 {
711 bool report;
712
713 spin_lock(&mirror->lock);
714 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
715 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
716 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
717 spin_unlock(&mirror->lock);
718
719 if (report)
720 pnfs_report_layoutstat(inode, nfs_io_gfp_mask());
721 }
722
723 static void
nfs4_ff_layout_stat_io_end_write(struct rpc_task * task,struct nfs4_ff_layout_mirror * mirror,__u64 requested,__u64 completed,enum nfs3_stable_how committed)724 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
725 struct nfs4_ff_layout_mirror *mirror,
726 __u64 requested,
727 __u64 completed,
728 enum nfs3_stable_how committed)
729 {
730 if (committed == NFS_UNSTABLE)
731 requested = completed = 0;
732
733 spin_lock(&mirror->lock);
734 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
735 requested, completed, ktime_get(), task->tk_start);
736 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
737 spin_unlock(&mirror->lock);
738 }
739
740 static void
ff_layout_mark_ds_unreachable(struct pnfs_layout_segment * lseg,u32 idx)741 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx)
742 {
743 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
744
745 if (devid)
746 nfs4_mark_deviceid_unavailable(devid);
747 }
748
749 static void
ff_layout_mark_ds_reachable(struct pnfs_layout_segment * lseg,u32 idx)750 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx)
751 {
752 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
753
754 if (devid)
755 nfs4_mark_deviceid_available(devid);
756 }
757
758 static struct nfs4_pnfs_ds *
ff_layout_choose_ds_for_read(struct pnfs_layout_segment * lseg,u32 start_idx,u32 * best_idx,bool check_device)759 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
760 u32 start_idx, u32 *best_idx,
761 bool check_device)
762 {
763 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
764 struct nfs4_ff_layout_mirror *mirror;
765 struct nfs4_pnfs_ds *ds;
766 u32 idx;
767
768 /* mirrors are initially sorted by efficiency */
769 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
770 mirror = FF_LAYOUT_COMP(lseg, idx);
771 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
772 if (!ds)
773 continue;
774
775 if (check_device &&
776 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
777 continue;
778
779 *best_idx = idx;
780 return ds;
781 }
782
783 return NULL;
784 }
785
786 static struct nfs4_pnfs_ds *
ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment * lseg,u32 start_idx,u32 * best_idx)787 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
788 u32 start_idx, u32 *best_idx)
789 {
790 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
791 }
792
793 static struct nfs4_pnfs_ds *
ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment * lseg,u32 start_idx,u32 * best_idx)794 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
795 u32 start_idx, u32 *best_idx)
796 {
797 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
798 }
799
800 static struct nfs4_pnfs_ds *
ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment * lseg,u32 start_idx,u32 * best_idx)801 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
802 u32 start_idx, u32 *best_idx)
803 {
804 struct nfs4_pnfs_ds *ds;
805
806 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
807 if (ds)
808 return ds;
809 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
810 }
811
812 static struct nfs4_pnfs_ds *
ff_layout_get_ds_for_read(struct nfs_pageio_descriptor * pgio,u32 * best_idx)813 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio,
814 u32 *best_idx)
815 {
816 struct pnfs_layout_segment *lseg = pgio->pg_lseg;
817 struct nfs4_pnfs_ds *ds;
818
819 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx,
820 best_idx);
821 if (ds || !pgio->pg_mirror_idx)
822 return ds;
823 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx);
824 }
825
826 static void
ff_layout_pg_get_read(struct nfs_pageio_descriptor * pgio,struct nfs_page * req,bool strict_iomode)827 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
828 struct nfs_page *req,
829 bool strict_iomode)
830 {
831 pnfs_put_lseg(pgio->pg_lseg);
832 pgio->pg_lseg =
833 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
834 req_offset(req), req->wb_bytes, IOMODE_READ,
835 strict_iomode, nfs_io_gfp_mask());
836 if (IS_ERR(pgio->pg_lseg)) {
837 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
838 pgio->pg_lseg = NULL;
839 }
840 }
841
842 static void
ff_layout_pg_init_read(struct nfs_pageio_descriptor * pgio,struct nfs_page * req)843 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
844 struct nfs_page *req)
845 {
846 struct nfs_pgio_mirror *pgm;
847 struct nfs4_ff_layout_mirror *mirror;
848 struct nfs4_pnfs_ds *ds;
849 u32 ds_idx;
850
851 if (NFS_SERVER(pgio->pg_inode)->flags &
852 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
853 pgio->pg_maxretrans = io_maxretrans;
854 retry:
855 pnfs_generic_pg_check_layout(pgio, req);
856 /* Use full layout for now */
857 if (!pgio->pg_lseg) {
858 ff_layout_pg_get_read(pgio, req, false);
859 if (!pgio->pg_lseg)
860 goto out_nolseg;
861 }
862 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
863 ff_layout_pg_get_read(pgio, req, true);
864 if (!pgio->pg_lseg)
865 goto out_nolseg;
866 }
867 /* Reset wb_nio, since getting layout segment was successful */
868 req->wb_nio = 0;
869
870 ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
871 if (!ds) {
872 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
873 goto out_mds;
874 pnfs_generic_pg_cleanup(pgio);
875 /* Sleep for 1 second before retrying */
876 ssleep(1);
877 goto retry;
878 }
879
880 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
881 pgm = &pgio->pg_mirrors[0];
882 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
883
884 pgio->pg_mirror_idx = ds_idx;
885 return;
886 out_nolseg:
887 if (pgio->pg_error < 0) {
888 if (pgio->pg_error != -EAGAIN)
889 return;
890 /* Retry getting layout segment if lower layer returned -EAGAIN */
891 if (pgio->pg_maxretrans && req->wb_nio++ > pgio->pg_maxretrans) {
892 if (NFS_SERVER(pgio->pg_inode)->flags & NFS_MOUNT_SOFTERR)
893 pgio->pg_error = -ETIMEDOUT;
894 else
895 pgio->pg_error = -EIO;
896 return;
897 }
898 pgio->pg_error = 0;
899 /* Sleep for 1 second before retrying */
900 ssleep(1);
901 goto retry;
902 }
903 out_mds:
904 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
905 0, NFS4_MAX_UINT64, IOMODE_READ,
906 NFS_I(pgio->pg_inode)->layout,
907 pgio->pg_lseg);
908 pgio->pg_maxretrans = 0;
909 nfs_pageio_reset_read_mds(pgio);
910 }
911
912 static void
ff_layout_pg_init_write(struct nfs_pageio_descriptor * pgio,struct nfs_page * req)913 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
914 struct nfs_page *req)
915 {
916 struct nfs4_ff_layout_mirror *mirror;
917 struct nfs_pgio_mirror *pgm;
918 struct nfs4_pnfs_ds *ds;
919 u32 i;
920
921 retry:
922 pnfs_generic_pg_check_layout(pgio, req);
923 if (!pgio->pg_lseg) {
924 pgio->pg_lseg =
925 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
926 req_offset(req), req->wb_bytes,
927 IOMODE_RW, false, nfs_io_gfp_mask());
928 if (IS_ERR(pgio->pg_lseg)) {
929 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
930 pgio->pg_lseg = NULL;
931 return;
932 }
933 }
934 /* If no lseg, fall back to write through mds */
935 if (pgio->pg_lseg == NULL)
936 goto out_mds;
937
938 /* Use a direct mapping of ds_idx to pgio mirror_idx */
939 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg))
940 goto out_eagain;
941
942 for (i = 0; i < pgio->pg_mirror_count; i++) {
943 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
944 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
945 if (!ds) {
946 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
947 goto out_mds;
948 pnfs_generic_pg_cleanup(pgio);
949 /* Sleep for 1 second before retrying */
950 ssleep(1);
951 goto retry;
952 }
953 pgm = &pgio->pg_mirrors[i];
954 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
955 }
956
957 if (NFS_SERVER(pgio->pg_inode)->flags &
958 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
959 pgio->pg_maxretrans = io_maxretrans;
960 return;
961 out_eagain:
962 pnfs_generic_pg_cleanup(pgio);
963 pgio->pg_error = -EAGAIN;
964 return;
965 out_mds:
966 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode,
967 0, NFS4_MAX_UINT64, IOMODE_RW,
968 NFS_I(pgio->pg_inode)->layout,
969 pgio->pg_lseg);
970 pgio->pg_maxretrans = 0;
971 nfs_pageio_reset_write_mds(pgio);
972 pgio->pg_error = -EAGAIN;
973 }
974
975 static unsigned int
ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor * pgio,struct nfs_page * req)976 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
977 struct nfs_page *req)
978 {
979 if (!pgio->pg_lseg) {
980 pgio->pg_lseg =
981 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
982 req_offset(req), req->wb_bytes,
983 IOMODE_RW, false, nfs_io_gfp_mask());
984 if (IS_ERR(pgio->pg_lseg)) {
985 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
986 pgio->pg_lseg = NULL;
987 goto out;
988 }
989 }
990 if (pgio->pg_lseg)
991 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
992
993 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode,
994 0, NFS4_MAX_UINT64, IOMODE_RW,
995 NFS_I(pgio->pg_inode)->layout,
996 pgio->pg_lseg);
997 /* no lseg means that pnfs is not in use, so no mirroring here */
998 nfs_pageio_reset_write_mds(pgio);
999 out:
1000 return 1;
1001 }
1002
1003 static u32
ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor * desc,u32 idx)1004 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
1005 {
1006 u32 old = desc->pg_mirror_idx;
1007
1008 desc->pg_mirror_idx = idx;
1009 return old;
1010 }
1011
1012 static struct nfs_pgio_mirror *
ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor * desc,u32 idx)1013 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx)
1014 {
1015 return &desc->pg_mirrors[idx];
1016 }
1017
1018 static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1019 .pg_init = ff_layout_pg_init_read,
1020 .pg_test = pnfs_generic_pg_test,
1021 .pg_doio = pnfs_generic_pg_readpages,
1022 .pg_cleanup = pnfs_generic_pg_cleanup,
1023 };
1024
1025 static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1026 .pg_init = ff_layout_pg_init_write,
1027 .pg_test = pnfs_generic_pg_test,
1028 .pg_doio = pnfs_generic_pg_writepages,
1029 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1030 .pg_cleanup = pnfs_generic_pg_cleanup,
1031 .pg_get_mirror = ff_layout_pg_get_mirror_write,
1032 .pg_set_mirror = ff_layout_pg_set_mirror_write,
1033 };
1034
ff_layout_reset_write(struct nfs_pgio_header * hdr,bool retry_pnfs)1035 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1036 {
1037 struct rpc_task *task = &hdr->task;
1038
1039 pnfs_layoutcommit_inode(hdr->inode, false);
1040
1041 if (retry_pnfs) {
1042 dprintk("%s Reset task %5u for i/o through pNFS "
1043 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1044 hdr->task.tk_pid,
1045 hdr->inode->i_sb->s_id,
1046 (unsigned long long)NFS_FILEID(hdr->inode),
1047 hdr->args.count,
1048 (unsigned long long)hdr->args.offset);
1049
1050 hdr->completion_ops->reschedule_io(hdr);
1051 return;
1052 }
1053
1054 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1055 dprintk("%s Reset task %5u for i/o through MDS "
1056 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1057 hdr->task.tk_pid,
1058 hdr->inode->i_sb->s_id,
1059 (unsigned long long)NFS_FILEID(hdr->inode),
1060 hdr->args.count,
1061 (unsigned long long)hdr->args.offset);
1062
1063 trace_pnfs_mds_fallback_write_done(hdr->inode,
1064 hdr->args.offset, hdr->args.count,
1065 IOMODE_RW, NFS_I(hdr->inode)->layout,
1066 hdr->lseg);
1067 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1068 }
1069 }
1070
ff_layout_resend_pnfs_read(struct nfs_pgio_header * hdr)1071 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr)
1072 {
1073 u32 idx = hdr->pgio_mirror_idx + 1;
1074 u32 new_idx = 0;
1075
1076 if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx))
1077 ff_layout_send_layouterror(hdr->lseg);
1078 else
1079 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1080 pnfs_read_resend_pnfs(hdr, new_idx);
1081 }
1082
ff_layout_reset_read(struct nfs_pgio_header * hdr)1083 static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1084 {
1085 struct rpc_task *task = &hdr->task;
1086
1087 pnfs_layoutcommit_inode(hdr->inode, false);
1088 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg);
1089
1090 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1091 dprintk("%s Reset task %5u for i/o through MDS "
1092 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1093 hdr->task.tk_pid,
1094 hdr->inode->i_sb->s_id,
1095 (unsigned long long)NFS_FILEID(hdr->inode),
1096 hdr->args.count,
1097 (unsigned long long)hdr->args.offset);
1098
1099 trace_pnfs_mds_fallback_read_done(hdr->inode,
1100 hdr->args.offset, hdr->args.count,
1101 IOMODE_READ, NFS_I(hdr->inode)->layout,
1102 hdr->lseg);
1103 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1104 }
1105 }
1106
ff_layout_async_handle_error_v4(struct rpc_task * task,struct nfs4_state * state,struct nfs_client * clp,struct pnfs_layout_segment * lseg,u32 idx)1107 static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1108 struct nfs4_state *state,
1109 struct nfs_client *clp,
1110 struct pnfs_layout_segment *lseg,
1111 u32 idx)
1112 {
1113 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1114 struct inode *inode = lo->plh_inode;
1115 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1116 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1117
1118 switch (task->tk_status) {
1119 case -NFS4ERR_BADSESSION:
1120 case -NFS4ERR_BADSLOT:
1121 case -NFS4ERR_BAD_HIGH_SLOT:
1122 case -NFS4ERR_DEADSESSION:
1123 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1124 case -NFS4ERR_SEQ_FALSE_RETRY:
1125 case -NFS4ERR_SEQ_MISORDERED:
1126 dprintk("%s ERROR %d, Reset session. Exchangeid "
1127 "flags 0x%x\n", __func__, task->tk_status,
1128 clp->cl_exchange_flags);
1129 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1130 break;
1131 case -NFS4ERR_DELAY:
1132 case -NFS4ERR_GRACE:
1133 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1134 break;
1135 case -NFS4ERR_RETRY_UNCACHED_REP:
1136 break;
1137 /* Invalidate Layout errors */
1138 case -NFS4ERR_PNFS_NO_LAYOUT:
1139 case -ESTALE: /* mapped NFS4ERR_STALE */
1140 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1141 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1142 case -NFS4ERR_FHEXPIRED:
1143 case -NFS4ERR_WRONG_TYPE:
1144 dprintk("%s Invalid layout error %d\n", __func__,
1145 task->tk_status);
1146 /*
1147 * Destroy layout so new i/o will get a new layout.
1148 * Layout will not be destroyed until all current lseg
1149 * references are put. Mark layout as invalid to resend failed
1150 * i/o and all i/o waiting on the slot table to the MDS until
1151 * layout is destroyed and a new valid layout is obtained.
1152 */
1153 pnfs_destroy_layout(NFS_I(inode));
1154 rpc_wake_up(&tbl->slot_tbl_waitq);
1155 goto reset;
1156 /* RPC connection errors */
1157 case -ENETDOWN:
1158 case -ENETUNREACH:
1159 if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags))
1160 return -NFS4ERR_FATAL_IOERROR;
1161 fallthrough;
1162 case -ECONNREFUSED:
1163 case -EHOSTDOWN:
1164 case -EHOSTUNREACH:
1165 case -EIO:
1166 case -ETIMEDOUT:
1167 case -EPIPE:
1168 case -EPROTO:
1169 case -ENODEV:
1170 dprintk("%s DS connection error %d\n", __func__,
1171 task->tk_status);
1172 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1173 &devid->deviceid);
1174 rpc_wake_up(&tbl->slot_tbl_waitq);
1175 fallthrough;
1176 default:
1177 if (ff_layout_avoid_mds_available_ds(lseg))
1178 return -NFS4ERR_RESET_TO_PNFS;
1179 reset:
1180 dprintk("%s Retry through MDS. Error %d\n", __func__,
1181 task->tk_status);
1182 return -NFS4ERR_RESET_TO_MDS;
1183 }
1184 task->tk_status = 0;
1185 return -EAGAIN;
1186 }
1187
1188 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
ff_layout_async_handle_error_v3(struct rpc_task * task,struct nfs_client * clp,struct pnfs_layout_segment * lseg,u32 idx)1189 static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1190 struct nfs_client *clp,
1191 struct pnfs_layout_segment *lseg,
1192 u32 idx)
1193 {
1194 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1195
1196 switch (task->tk_status) {
1197 /* File access problems. Don't mark the device as unavailable */
1198 case -EACCES:
1199 case -ESTALE:
1200 case -EISDIR:
1201 case -EBADHANDLE:
1202 case -ELOOP:
1203 case -ENOSPC:
1204 break;
1205 case -EJUKEBOX:
1206 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1207 goto out_retry;
1208 case -ENETDOWN:
1209 case -ENETUNREACH:
1210 if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags))
1211 return -NFS4ERR_FATAL_IOERROR;
1212 fallthrough;
1213 default:
1214 dprintk("%s DS connection error %d\n", __func__,
1215 task->tk_status);
1216 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1217 &devid->deviceid);
1218 }
1219 /* FIXME: Need to prevent infinite looping here. */
1220 return -NFS4ERR_RESET_TO_PNFS;
1221 out_retry:
1222 task->tk_status = 0;
1223 rpc_restart_call_prepare(task);
1224 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1225 return -EAGAIN;
1226 }
1227
ff_layout_async_handle_error(struct rpc_task * task,struct nfs4_state * state,struct nfs_client * clp,struct pnfs_layout_segment * lseg,u32 idx)1228 static int ff_layout_async_handle_error(struct rpc_task *task,
1229 struct nfs4_state *state,
1230 struct nfs_client *clp,
1231 struct pnfs_layout_segment *lseg,
1232 u32 idx)
1233 {
1234 int vers = clp->cl_nfs_mod->rpc_vers->number;
1235
1236 if (task->tk_status >= 0) {
1237 ff_layout_mark_ds_reachable(lseg, idx);
1238 return 0;
1239 }
1240
1241 /* Handle the case of an invalid layout segment */
1242 if (!pnfs_is_valid_lseg(lseg))
1243 return -NFS4ERR_RESET_TO_PNFS;
1244
1245 switch (vers) {
1246 case 3:
1247 return ff_layout_async_handle_error_v3(task, clp, lseg, idx);
1248 case 4:
1249 return ff_layout_async_handle_error_v4(task, state, clp,
1250 lseg, idx);
1251 default:
1252 /* should never happen */
1253 WARN_ON_ONCE(1);
1254 return 0;
1255 }
1256 }
1257
ff_layout_io_track_ds_error(struct pnfs_layout_segment * lseg,u32 idx,u64 offset,u64 length,u32 * op_status,int opnum,int error)1258 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1259 u32 idx, u64 offset, u64 length,
1260 u32 *op_status, int opnum, int error)
1261 {
1262 struct nfs4_ff_layout_mirror *mirror;
1263 u32 status = *op_status;
1264 int err;
1265
1266 if (status == 0) {
1267 switch (error) {
1268 case -ETIMEDOUT:
1269 case -EPFNOSUPPORT:
1270 case -EPROTONOSUPPORT:
1271 case -EOPNOTSUPP:
1272 case -EINVAL:
1273 case -ECONNREFUSED:
1274 case -ECONNRESET:
1275 case -EHOSTDOWN:
1276 case -EHOSTUNREACH:
1277 case -ENETDOWN:
1278 case -ENETUNREACH:
1279 case -EADDRINUSE:
1280 case -ENOBUFS:
1281 case -EPIPE:
1282 case -EPERM:
1283 case -EPROTO:
1284 case -ENODEV:
1285 *op_status = status = NFS4ERR_NXIO;
1286 break;
1287 case -EACCES:
1288 *op_status = status = NFS4ERR_ACCESS;
1289 break;
1290 default:
1291 return;
1292 }
1293 }
1294
1295 mirror = FF_LAYOUT_COMP(lseg, idx);
1296 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1297 mirror, offset, length, status, opnum,
1298 nfs_io_gfp_mask());
1299
1300 switch (status) {
1301 case NFS4ERR_DELAY:
1302 case NFS4ERR_GRACE:
1303 break;
1304 case NFS4ERR_NXIO:
1305 ff_layout_mark_ds_unreachable(lseg, idx);
1306 /*
1307 * Don't return the layout if this is a read and we still
1308 * have layouts to try
1309 */
1310 if (opnum == OP_READ)
1311 break;
1312 fallthrough;
1313 default:
1314 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
1315 lseg);
1316 }
1317
1318 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1319 }
1320
1321 /* NFS_PROTO call done callback routines */
ff_layout_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)1322 static int ff_layout_read_done_cb(struct rpc_task *task,
1323 struct nfs_pgio_header *hdr)
1324 {
1325 int err;
1326
1327 if (task->tk_status < 0) {
1328 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1329 hdr->args.offset, hdr->args.count,
1330 &hdr->res.op_status, OP_READ,
1331 task->tk_status);
1332 trace_ff_layout_read_error(hdr, task->tk_status);
1333 }
1334
1335 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1336 hdr->ds_clp, hdr->lseg,
1337 hdr->pgio_mirror_idx);
1338
1339 trace_nfs4_pnfs_read(hdr, err);
1340 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1341 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1342 switch (err) {
1343 case -NFS4ERR_RESET_TO_PNFS:
1344 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1345 return task->tk_status;
1346 case -NFS4ERR_RESET_TO_MDS:
1347 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1348 return task->tk_status;
1349 case -EAGAIN:
1350 goto out_eagain;
1351 case -NFS4ERR_FATAL_IOERROR:
1352 task->tk_status = -EIO;
1353 return 0;
1354 }
1355
1356 return 0;
1357 out_eagain:
1358 rpc_restart_call_prepare(task);
1359 return -EAGAIN;
1360 }
1361
1362 static bool
ff_layout_need_layoutcommit(struct pnfs_layout_segment * lseg)1363 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1364 {
1365 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1366 }
1367
1368 /*
1369 * We reference the rpc_cred of the first WRITE that triggers the need for
1370 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1371 * rfc5661 is not clear about which credential should be used.
1372 *
1373 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1374 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1375 * we always send layoutcommit after DS writes.
1376 */
1377 static void
ff_layout_set_layoutcommit(struct inode * inode,struct pnfs_layout_segment * lseg,loff_t end_offset)1378 ff_layout_set_layoutcommit(struct inode *inode,
1379 struct pnfs_layout_segment *lseg,
1380 loff_t end_offset)
1381 {
1382 if (!ff_layout_need_layoutcommit(lseg))
1383 return;
1384
1385 pnfs_set_layoutcommit(inode, lseg, end_offset);
1386 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1387 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
1388 }
1389
ff_layout_read_record_layoutstats_start(struct rpc_task * task,struct nfs_pgio_header * hdr)1390 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1391 struct nfs_pgio_header *hdr)
1392 {
1393 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1394 return;
1395 nfs4_ff_layout_stat_io_start_read(hdr->inode,
1396 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1397 hdr->args.count,
1398 task->tk_start);
1399 }
1400
ff_layout_read_record_layoutstats_done(struct rpc_task * task,struct nfs_pgio_header * hdr)1401 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1402 struct nfs_pgio_header *hdr)
1403 {
1404 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1405 return;
1406 nfs4_ff_layout_stat_io_end_read(task,
1407 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1408 hdr->args.count,
1409 hdr->res.count);
1410 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1411 }
1412
ff_layout_read_prepare_common(struct rpc_task * task,struct nfs_pgio_header * hdr)1413 static int ff_layout_read_prepare_common(struct rpc_task *task,
1414 struct nfs_pgio_header *hdr)
1415 {
1416 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1417 rpc_exit(task, -EIO);
1418 return -EIO;
1419 }
1420
1421 if (!pnfs_is_valid_lseg(hdr->lseg)) {
1422 rpc_exit(task, -EAGAIN);
1423 return -EAGAIN;
1424 }
1425
1426 ff_layout_read_record_layoutstats_start(task, hdr);
1427 return 0;
1428 }
1429
1430 /*
1431 * Call ops for the async read/write cases
1432 * In the case of dense layouts, the offset needs to be reset to its
1433 * original value.
1434 */
ff_layout_read_prepare_v3(struct rpc_task * task,void * data)1435 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1436 {
1437 struct nfs_pgio_header *hdr = data;
1438
1439 if (ff_layout_read_prepare_common(task, hdr))
1440 return;
1441
1442 rpc_call_start(task);
1443 }
1444
ff_layout_read_prepare_v4(struct rpc_task * task,void * data)1445 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1446 {
1447 struct nfs_pgio_header *hdr = data;
1448
1449 if (nfs4_setup_sequence(hdr->ds_clp,
1450 &hdr->args.seq_args,
1451 &hdr->res.seq_res,
1452 task))
1453 return;
1454
1455 ff_layout_read_prepare_common(task, hdr);
1456 }
1457
ff_layout_read_call_done(struct rpc_task * task,void * data)1458 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1459 {
1460 struct nfs_pgio_header *hdr = data;
1461
1462 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1463 task->tk_status == 0) {
1464 nfs4_sequence_done(task, &hdr->res.seq_res);
1465 return;
1466 }
1467
1468 /* Note this may cause RPC to be resent */
1469 hdr->mds_ops->rpc_call_done(task, hdr);
1470 }
1471
ff_layout_read_count_stats(struct rpc_task * task,void * data)1472 static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1473 {
1474 struct nfs_pgio_header *hdr = data;
1475
1476 ff_layout_read_record_layoutstats_done(task, hdr);
1477 rpc_count_iostats_metrics(task,
1478 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1479 }
1480
ff_layout_read_release(void * data)1481 static void ff_layout_read_release(void *data)
1482 {
1483 struct nfs_pgio_header *hdr = data;
1484
1485 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
1486 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
1487 ff_layout_resend_pnfs_read(hdr);
1488 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1489 ff_layout_reset_read(hdr);
1490 pnfs_generic_rw_release(data);
1491 }
1492
1493
ff_layout_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)1494 static int ff_layout_write_done_cb(struct rpc_task *task,
1495 struct nfs_pgio_header *hdr)
1496 {
1497 loff_t end_offs = 0;
1498 int err;
1499
1500 if (task->tk_status < 0) {
1501 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1502 hdr->args.offset, hdr->args.count,
1503 &hdr->res.op_status, OP_WRITE,
1504 task->tk_status);
1505 trace_ff_layout_write_error(hdr, task->tk_status);
1506 }
1507
1508 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1509 hdr->ds_clp, hdr->lseg,
1510 hdr->pgio_mirror_idx);
1511
1512 trace_nfs4_pnfs_write(hdr, err);
1513 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1514 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1515 switch (err) {
1516 case -NFS4ERR_RESET_TO_PNFS:
1517 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1518 return task->tk_status;
1519 case -NFS4ERR_RESET_TO_MDS:
1520 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
1521 return task->tk_status;
1522 case -EAGAIN:
1523 return -EAGAIN;
1524 case -NFS4ERR_FATAL_IOERROR:
1525 task->tk_status = -EIO;
1526 return 0;
1527 }
1528
1529 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1530 hdr->res.verf->committed == NFS_DATA_SYNC)
1531 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1532
1533 /* Note: if the write is unstable, don't set end_offs until commit */
1534 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
1535
1536 /* zero out fattr since we don't care DS attr at all */
1537 hdr->fattr.valid = 0;
1538 if (task->tk_status >= 0)
1539 nfs_writeback_update_inode(hdr);
1540
1541 return 0;
1542 }
1543
ff_layout_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)1544 static int ff_layout_commit_done_cb(struct rpc_task *task,
1545 struct nfs_commit_data *data)
1546 {
1547 int err;
1548
1549 if (task->tk_status < 0) {
1550 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1551 data->args.offset, data->args.count,
1552 &data->res.op_status, OP_COMMIT,
1553 task->tk_status);
1554 trace_ff_layout_commit_error(data, task->tk_status);
1555 }
1556
1557 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1558 data->lseg, data->ds_commit_index);
1559
1560 trace_nfs4_pnfs_commit_ds(data, err);
1561 switch (err) {
1562 case -NFS4ERR_RESET_TO_PNFS:
1563 pnfs_generic_prepare_to_resend_writes(data);
1564 return -EAGAIN;
1565 case -NFS4ERR_RESET_TO_MDS:
1566 pnfs_generic_prepare_to_resend_writes(data);
1567 return -EAGAIN;
1568 case -EAGAIN:
1569 rpc_restart_call_prepare(task);
1570 return -EAGAIN;
1571 case -NFS4ERR_FATAL_IOERROR:
1572 task->tk_status = -EIO;
1573 return 0;
1574 }
1575
1576 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
1577
1578 return 0;
1579 }
1580
ff_layout_write_record_layoutstats_start(struct rpc_task * task,struct nfs_pgio_header * hdr)1581 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1582 struct nfs_pgio_header *hdr)
1583 {
1584 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1585 return;
1586 nfs4_ff_layout_stat_io_start_write(hdr->inode,
1587 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1588 hdr->args.count,
1589 task->tk_start);
1590 }
1591
ff_layout_write_record_layoutstats_done(struct rpc_task * task,struct nfs_pgio_header * hdr)1592 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1593 struct nfs_pgio_header *hdr)
1594 {
1595 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1596 return;
1597 nfs4_ff_layout_stat_io_end_write(task,
1598 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1599 hdr->args.count, hdr->res.count,
1600 hdr->res.verf->committed);
1601 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
1602 }
1603
ff_layout_write_prepare_common(struct rpc_task * task,struct nfs_pgio_header * hdr)1604 static int ff_layout_write_prepare_common(struct rpc_task *task,
1605 struct nfs_pgio_header *hdr)
1606 {
1607 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1608 rpc_exit(task, -EIO);
1609 return -EIO;
1610 }
1611
1612 if (!pnfs_is_valid_lseg(hdr->lseg)) {
1613 rpc_exit(task, -EAGAIN);
1614 return -EAGAIN;
1615 }
1616
1617 ff_layout_write_record_layoutstats_start(task, hdr);
1618 return 0;
1619 }
1620
ff_layout_write_prepare_v3(struct rpc_task * task,void * data)1621 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1622 {
1623 struct nfs_pgio_header *hdr = data;
1624
1625 if (ff_layout_write_prepare_common(task, hdr))
1626 return;
1627
1628 rpc_call_start(task);
1629 }
1630
ff_layout_write_prepare_v4(struct rpc_task * task,void * data)1631 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1632 {
1633 struct nfs_pgio_header *hdr = data;
1634
1635 if (nfs4_setup_sequence(hdr->ds_clp,
1636 &hdr->args.seq_args,
1637 &hdr->res.seq_res,
1638 task))
1639 return;
1640
1641 ff_layout_write_prepare_common(task, hdr);
1642 }
1643
ff_layout_write_call_done(struct rpc_task * task,void * data)1644 static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1645 {
1646 struct nfs_pgio_header *hdr = data;
1647
1648 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1649 task->tk_status == 0) {
1650 nfs4_sequence_done(task, &hdr->res.seq_res);
1651 return;
1652 }
1653
1654 /* Note this may cause RPC to be resent */
1655 hdr->mds_ops->rpc_call_done(task, hdr);
1656 }
1657
ff_layout_write_count_stats(struct rpc_task * task,void * data)1658 static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1659 {
1660 struct nfs_pgio_header *hdr = data;
1661
1662 ff_layout_write_record_layoutstats_done(task, hdr);
1663 rpc_count_iostats_metrics(task,
1664 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1665 }
1666
ff_layout_write_release(void * data)1667 static void ff_layout_write_release(void *data)
1668 {
1669 struct nfs_pgio_header *hdr = data;
1670
1671 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
1672 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1673 ff_layout_send_layouterror(hdr->lseg);
1674 ff_layout_reset_write(hdr, true);
1675 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
1676 ff_layout_reset_write(hdr, false);
1677 pnfs_generic_rw_release(data);
1678 }
1679
ff_layout_commit_record_layoutstats_start(struct rpc_task * task,struct nfs_commit_data * cdata)1680 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
1681 struct nfs_commit_data *cdata)
1682 {
1683 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1684 return;
1685 nfs4_ff_layout_stat_io_start_write(cdata->inode,
1686 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1687 0, task->tk_start);
1688 }
1689
ff_layout_commit_record_layoutstats_done(struct rpc_task * task,struct nfs_commit_data * cdata)1690 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1691 struct nfs_commit_data *cdata)
1692 {
1693 struct nfs_page *req;
1694 __u64 count = 0;
1695
1696 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1697 return;
1698
1699 if (task->tk_status == 0) {
1700 list_for_each_entry(req, &cdata->pages, wb_list)
1701 count += req->wb_bytes;
1702 }
1703 nfs4_ff_layout_stat_io_end_write(task,
1704 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1705 count, count, NFS_FILE_SYNC);
1706 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
1707 }
1708
ff_layout_commit_prepare_common(struct rpc_task * task,struct nfs_commit_data * cdata)1709 static int ff_layout_commit_prepare_common(struct rpc_task *task,
1710 struct nfs_commit_data *cdata)
1711 {
1712 if (!pnfs_is_valid_lseg(cdata->lseg)) {
1713 rpc_exit(task, -EAGAIN);
1714 return -EAGAIN;
1715 }
1716
1717 ff_layout_commit_record_layoutstats_start(task, cdata);
1718 return 0;
1719 }
1720
ff_layout_commit_prepare_v3(struct rpc_task * task,void * data)1721 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1722 {
1723 if (ff_layout_commit_prepare_common(task, data))
1724 return;
1725
1726 rpc_call_start(task);
1727 }
1728
ff_layout_commit_prepare_v4(struct rpc_task * task,void * data)1729 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1730 {
1731 struct nfs_commit_data *wdata = data;
1732
1733 if (nfs4_setup_sequence(wdata->ds_clp,
1734 &wdata->args.seq_args,
1735 &wdata->res.seq_res,
1736 task))
1737 return;
1738 ff_layout_commit_prepare_common(task, data);
1739 }
1740
ff_layout_commit_done(struct rpc_task * task,void * data)1741 static void ff_layout_commit_done(struct rpc_task *task, void *data)
1742 {
1743 pnfs_generic_write_commit_done(task, data);
1744 }
1745
ff_layout_commit_count_stats(struct rpc_task * task,void * data)1746 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
1747 {
1748 struct nfs_commit_data *cdata = data;
1749
1750 ff_layout_commit_record_layoutstats_done(task, cdata);
1751 rpc_count_iostats_metrics(task,
1752 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1753 }
1754
ff_layout_commit_release(void * data)1755 static void ff_layout_commit_release(void *data)
1756 {
1757 struct nfs_commit_data *cdata = data;
1758
1759 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1760 pnfs_generic_commit_release(data);
1761 }
1762
1763 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1764 .rpc_call_prepare = ff_layout_read_prepare_v3,
1765 .rpc_call_done = ff_layout_read_call_done,
1766 .rpc_count_stats = ff_layout_read_count_stats,
1767 .rpc_release = ff_layout_read_release,
1768 };
1769
1770 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1771 .rpc_call_prepare = ff_layout_read_prepare_v4,
1772 .rpc_call_done = ff_layout_read_call_done,
1773 .rpc_count_stats = ff_layout_read_count_stats,
1774 .rpc_release = ff_layout_read_release,
1775 };
1776
1777 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1778 .rpc_call_prepare = ff_layout_write_prepare_v3,
1779 .rpc_call_done = ff_layout_write_call_done,
1780 .rpc_count_stats = ff_layout_write_count_stats,
1781 .rpc_release = ff_layout_write_release,
1782 };
1783
1784 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1785 .rpc_call_prepare = ff_layout_write_prepare_v4,
1786 .rpc_call_done = ff_layout_write_call_done,
1787 .rpc_count_stats = ff_layout_write_count_stats,
1788 .rpc_release = ff_layout_write_release,
1789 };
1790
1791 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1792 .rpc_call_prepare = ff_layout_commit_prepare_v3,
1793 .rpc_call_done = ff_layout_commit_done,
1794 .rpc_count_stats = ff_layout_commit_count_stats,
1795 .rpc_release = ff_layout_commit_release,
1796 };
1797
1798 static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1799 .rpc_call_prepare = ff_layout_commit_prepare_v4,
1800 .rpc_call_done = ff_layout_commit_done,
1801 .rpc_count_stats = ff_layout_commit_count_stats,
1802 .rpc_release = ff_layout_commit_release,
1803 };
1804
1805 static enum pnfs_try_status
ff_layout_read_pagelist(struct nfs_pgio_header * hdr)1806 ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1807 {
1808 struct pnfs_layout_segment *lseg = hdr->lseg;
1809 struct nfs4_pnfs_ds *ds;
1810 struct rpc_clnt *ds_clnt;
1811 struct nfsd_file *localio;
1812 struct nfs4_ff_layout_mirror *mirror;
1813 const struct cred *ds_cred;
1814 loff_t offset = hdr->args.offset;
1815 u32 idx = hdr->pgio_mirror_idx;
1816 int vers;
1817 struct nfs_fh *fh;
1818
1819 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
1820 __func__, hdr->inode->i_ino,
1821 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1822
1823 mirror = FF_LAYOUT_COMP(lseg, idx);
1824 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
1825 if (!ds)
1826 goto out_failed;
1827
1828 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1829 hdr->inode);
1830 if (IS_ERR(ds_clnt))
1831 goto out_failed;
1832
1833 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1834 if (!ds_cred)
1835 goto out_failed;
1836
1837 vers = nfs4_ff_layout_ds_version(mirror);
1838
1839 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
1840 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
1841
1842 hdr->pgio_done_cb = ff_layout_read_done_cb;
1843 refcount_inc(&ds->ds_clp->cl_count);
1844 hdr->ds_clp = ds->ds_clp;
1845 fh = nfs4_ff_layout_select_ds_fh(mirror);
1846 if (fh)
1847 hdr->args.fh = fh;
1848
1849 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1850
1851 /*
1852 * Note that if we ever decide to split across DSes,
1853 * then we may need to handle dense-like offsets.
1854 */
1855 hdr->args.offset = offset;
1856 hdr->mds_offset = offset;
1857
1858 /* Start IO accounting for local read */
1859 localio = ff_local_open_fh(lseg, idx, ds->ds_clp, ds_cred, fh, FMODE_READ);
1860 if (localio) {
1861 hdr->task.tk_start = ktime_get();
1862 ff_layout_read_record_layoutstats_start(&hdr->task, hdr);
1863 }
1864
1865 /* Perform an asynchronous read to ds */
1866 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1867 vers == 3 ? &ff_layout_read_call_ops_v3 :
1868 &ff_layout_read_call_ops_v4,
1869 0, RPC_TASK_SOFTCONN, localio);
1870 put_cred(ds_cred);
1871 return PNFS_ATTEMPTED;
1872
1873 out_failed:
1874 if (ff_layout_avoid_mds_available_ds(lseg))
1875 return PNFS_TRY_AGAIN;
1876 trace_pnfs_mds_fallback_read_pagelist(hdr->inode,
1877 hdr->args.offset, hdr->args.count,
1878 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg);
1879 return PNFS_NOT_ATTEMPTED;
1880 }
1881
1882 /* Perform async writes. */
1883 static enum pnfs_try_status
ff_layout_write_pagelist(struct nfs_pgio_header * hdr,int sync)1884 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1885 {
1886 struct pnfs_layout_segment *lseg = hdr->lseg;
1887 struct nfs4_pnfs_ds *ds;
1888 struct rpc_clnt *ds_clnt;
1889 struct nfsd_file *localio;
1890 struct nfs4_ff_layout_mirror *mirror;
1891 const struct cred *ds_cred;
1892 loff_t offset = hdr->args.offset;
1893 int vers;
1894 struct nfs_fh *fh;
1895 u32 idx = hdr->pgio_mirror_idx;
1896
1897 mirror = FF_LAYOUT_COMP(lseg, idx);
1898 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1899 if (!ds)
1900 goto out_failed;
1901
1902 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1903 hdr->inode);
1904 if (IS_ERR(ds_clnt))
1905 goto out_failed;
1906
1907 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred);
1908 if (!ds_cred)
1909 goto out_failed;
1910
1911 vers = nfs4_ff_layout_ds_version(mirror);
1912
1913 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
1914 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
1915 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
1916 vers);
1917
1918 hdr->pgio_done_cb = ff_layout_write_done_cb;
1919 refcount_inc(&ds->ds_clp->cl_count);
1920 hdr->ds_clp = ds->ds_clp;
1921 hdr->ds_commit_idx = idx;
1922 fh = nfs4_ff_layout_select_ds_fh(mirror);
1923 if (fh)
1924 hdr->args.fh = fh;
1925
1926 nfs4_ff_layout_select_ds_stateid(mirror, &hdr->args.stateid);
1927
1928 /*
1929 * Note that if we ever decide to split across DSes,
1930 * then we may need to handle dense-like offsets.
1931 */
1932 hdr->args.offset = offset;
1933
1934 /* Start IO accounting for local write */
1935 localio = ff_local_open_fh(lseg, idx, ds->ds_clp, ds_cred, fh,
1936 FMODE_READ|FMODE_WRITE);
1937 if (localio) {
1938 hdr->task.tk_start = ktime_get();
1939 ff_layout_write_record_layoutstats_start(&hdr->task, hdr);
1940 }
1941
1942 /* Perform an asynchronous write */
1943 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1944 vers == 3 ? &ff_layout_write_call_ops_v3 :
1945 &ff_layout_write_call_ops_v4,
1946 sync, RPC_TASK_SOFTCONN, localio);
1947 put_cred(ds_cred);
1948 return PNFS_ATTEMPTED;
1949
1950 out_failed:
1951 if (ff_layout_avoid_mds_available_ds(lseg))
1952 return PNFS_TRY_AGAIN;
1953 trace_pnfs_mds_fallback_write_pagelist(hdr->inode,
1954 hdr->args.offset, hdr->args.count,
1955 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg);
1956 return PNFS_NOT_ATTEMPTED;
1957 }
1958
calc_ds_index_from_commit(struct pnfs_layout_segment * lseg,u32 i)1959 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1960 {
1961 return i;
1962 }
1963
1964 static struct nfs_fh *
select_ds_fh_from_commit(struct pnfs_layout_segment * lseg,u32 i)1965 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1966 {
1967 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1968
1969 /* FIXME: Assume that there is only one NFS version available
1970 * for the DS.
1971 */
1972 return &flseg->mirror_array[i]->fh_versions[0];
1973 }
1974
ff_layout_initiate_commit(struct nfs_commit_data * data,int how)1975 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1976 {
1977 struct pnfs_layout_segment *lseg = data->lseg;
1978 struct nfs4_pnfs_ds *ds;
1979 struct rpc_clnt *ds_clnt;
1980 struct nfsd_file *localio;
1981 struct nfs4_ff_layout_mirror *mirror;
1982 const struct cred *ds_cred;
1983 u32 idx;
1984 int vers, ret;
1985 struct nfs_fh *fh;
1986
1987 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1988 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1989 goto out_err;
1990
1991 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1992 mirror = FF_LAYOUT_COMP(lseg, idx);
1993 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
1994 if (!ds)
1995 goto out_err;
1996
1997 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp,
1998 data->inode);
1999 if (IS_ERR(ds_clnt))
2000 goto out_err;
2001
2002 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred);
2003 if (!ds_cred)
2004 goto out_err;
2005
2006 vers = nfs4_ff_layout_ds_version(mirror);
2007
2008 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
2009 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
2010 vers);
2011 data->commit_done_cb = ff_layout_commit_done_cb;
2012 data->cred = ds_cred;
2013 refcount_inc(&ds->ds_clp->cl_count);
2014 data->ds_clp = ds->ds_clp;
2015 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
2016 if (fh)
2017 data->args.fh = fh;
2018
2019 /* Start IO accounting for local commit */
2020 localio = ff_local_open_fh(lseg, idx, ds->ds_clp, ds_cred, fh,
2021 FMODE_READ|FMODE_WRITE);
2022 if (localio) {
2023 data->task.tk_start = ktime_get();
2024 ff_layout_commit_record_layoutstats_start(&data->task, data);
2025 }
2026
2027 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
2028 vers == 3 ? &ff_layout_commit_call_ops_v3 :
2029 &ff_layout_commit_call_ops_v4,
2030 how, RPC_TASK_SOFTCONN, localio);
2031 put_cred(ds_cred);
2032 return ret;
2033 out_err:
2034 pnfs_generic_prepare_to_resend_writes(data);
2035 pnfs_generic_commit_release(data);
2036 return -EAGAIN;
2037 }
2038
2039 static int
ff_layout_commit_pagelist(struct inode * inode,struct list_head * mds_pages,int how,struct nfs_commit_info * cinfo)2040 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
2041 int how, struct nfs_commit_info *cinfo)
2042 {
2043 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
2044 ff_layout_initiate_commit);
2045 }
2046
ff_layout_match_rw(const struct rpc_task * task,const struct nfs_pgio_header * hdr,const struct pnfs_layout_segment * lseg)2047 static bool ff_layout_match_rw(const struct rpc_task *task,
2048 const struct nfs_pgio_header *hdr,
2049 const struct pnfs_layout_segment *lseg)
2050 {
2051 return hdr->lseg == lseg;
2052 }
2053
ff_layout_match_commit(const struct rpc_task * task,const struct nfs_commit_data * cdata,const struct pnfs_layout_segment * lseg)2054 static bool ff_layout_match_commit(const struct rpc_task *task,
2055 const struct nfs_commit_data *cdata,
2056 const struct pnfs_layout_segment *lseg)
2057 {
2058 return cdata->lseg == lseg;
2059 }
2060
ff_layout_match_io(const struct rpc_task * task,const void * data)2061 static bool ff_layout_match_io(const struct rpc_task *task, const void *data)
2062 {
2063 const struct rpc_call_ops *ops = task->tk_ops;
2064
2065 if (ops == &ff_layout_read_call_ops_v3 ||
2066 ops == &ff_layout_read_call_ops_v4 ||
2067 ops == &ff_layout_write_call_ops_v3 ||
2068 ops == &ff_layout_write_call_ops_v4)
2069 return ff_layout_match_rw(task, task->tk_calldata, data);
2070 if (ops == &ff_layout_commit_call_ops_v3 ||
2071 ops == &ff_layout_commit_call_ops_v4)
2072 return ff_layout_match_commit(task, task->tk_calldata, data);
2073 return false;
2074 }
2075
ff_layout_cancel_io(struct pnfs_layout_segment * lseg)2076 static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg)
2077 {
2078 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2079 struct nfs4_ff_layout_mirror *mirror;
2080 struct nfs4_ff_layout_ds *mirror_ds;
2081 struct nfs4_pnfs_ds *ds;
2082 struct nfs_client *ds_clp;
2083 struct rpc_clnt *clnt;
2084 u32 idx;
2085
2086 for (idx = 0; idx < flseg->mirror_array_cnt; idx++) {
2087 mirror = flseg->mirror_array[idx];
2088 mirror_ds = mirror->mirror_ds;
2089 if (IS_ERR_OR_NULL(mirror_ds))
2090 continue;
2091 ds = mirror->mirror_ds->ds;
2092 if (!ds)
2093 continue;
2094 ds_clp = ds->ds_clp;
2095 if (!ds_clp)
2096 continue;
2097 clnt = ds_clp->cl_rpcclient;
2098 if (!clnt)
2099 continue;
2100 if (!rpc_cancel_tasks(clnt, -EAGAIN, ff_layout_match_io, lseg))
2101 continue;
2102 rpc_clnt_disconnect(clnt);
2103 }
2104 }
2105
2106 static struct pnfs_ds_commit_info *
ff_layout_get_ds_info(struct inode * inode)2107 ff_layout_get_ds_info(struct inode *inode)
2108 {
2109 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
2110
2111 if (layout == NULL)
2112 return NULL;
2113
2114 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
2115 }
2116
2117 static void
ff_layout_setup_ds_info(struct pnfs_ds_commit_info * fl_cinfo,struct pnfs_layout_segment * lseg)2118 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2119 struct pnfs_layout_segment *lseg)
2120 {
2121 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
2122 struct inode *inode = lseg->pls_layout->plh_inode;
2123 struct pnfs_commit_array *array, *new;
2124
2125 new = pnfs_alloc_commit_array(flseg->mirror_array_cnt,
2126 nfs_io_gfp_mask());
2127 if (new) {
2128 spin_lock(&inode->i_lock);
2129 array = pnfs_add_commit_array(fl_cinfo, new, lseg);
2130 spin_unlock(&inode->i_lock);
2131 if (array != new)
2132 pnfs_free_commit_array(new);
2133 }
2134 }
2135
2136 static void
ff_layout_release_ds_info(struct pnfs_ds_commit_info * fl_cinfo,struct inode * inode)2137 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo,
2138 struct inode *inode)
2139 {
2140 spin_lock(&inode->i_lock);
2141 pnfs_generic_ds_cinfo_destroy(fl_cinfo);
2142 spin_unlock(&inode->i_lock);
2143 }
2144
2145 static void
ff_layout_free_deviceid_node(struct nfs4_deviceid_node * d)2146 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
2147 {
2148 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
2149 id_node));
2150 }
2151
ff_layout_encode_ioerr(struct xdr_stream * xdr,const struct nfs4_layoutreturn_args * args,const struct nfs4_flexfile_layoutreturn_args * ff_args)2152 static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
2153 const struct nfs4_layoutreturn_args *args,
2154 const struct nfs4_flexfile_layoutreturn_args *ff_args)
2155 {
2156 __be32 *start;
2157
2158 start = xdr_reserve_space(xdr, 4);
2159 if (unlikely(!start))
2160 return -E2BIG;
2161
2162 *start = cpu_to_be32(ff_args->num_errors);
2163 /* This assume we always return _ALL_ layouts */
2164 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
2165 }
2166
2167 static void
ff_layout_encode_ff_iostat_head(struct xdr_stream * xdr,const nfs4_stateid * stateid,const struct nfs42_layoutstat_devinfo * devinfo)2168 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2169 const nfs4_stateid *stateid,
2170 const struct nfs42_layoutstat_devinfo *devinfo)
2171 {
2172 __be32 *p;
2173
2174 p = xdr_reserve_space(xdr, 8 + 8);
2175 p = xdr_encode_hyper(p, devinfo->offset);
2176 p = xdr_encode_hyper(p, devinfo->length);
2177 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2178 p = xdr_reserve_space(xdr, 4*8);
2179 p = xdr_encode_hyper(p, devinfo->read_count);
2180 p = xdr_encode_hyper(p, devinfo->read_bytes);
2181 p = xdr_encode_hyper(p, devinfo->write_count);
2182 p = xdr_encode_hyper(p, devinfo->write_bytes);
2183 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2184 }
2185
2186 static void
ff_layout_encode_ff_iostat(struct xdr_stream * xdr,const nfs4_stateid * stateid,const struct nfs42_layoutstat_devinfo * devinfo)2187 ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2188 const nfs4_stateid *stateid,
2189 const struct nfs42_layoutstat_devinfo *devinfo)
2190 {
2191 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2192 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2193 devinfo->ld_private.data);
2194 }
2195
2196 /* report nothing for now */
ff_layout_encode_iostats_array(struct xdr_stream * xdr,const struct nfs4_layoutreturn_args * args,struct nfs4_flexfile_layoutreturn_args * ff_args)2197 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2198 const struct nfs4_layoutreturn_args *args,
2199 struct nfs4_flexfile_layoutreturn_args *ff_args)
2200 {
2201 __be32 *p;
2202 int i;
2203
2204 p = xdr_reserve_space(xdr, 4);
2205 *p = cpu_to_be32(ff_args->num_dev);
2206 for (i = 0; i < ff_args->num_dev; i++)
2207 ff_layout_encode_ff_iostat(xdr,
2208 &args->layout->plh_stateid,
2209 &ff_args->devinfo[i]);
2210 }
2211
2212 static void
ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo * devinfo,unsigned int num_entries)2213 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2214 unsigned int num_entries)
2215 {
2216 unsigned int i;
2217
2218 for (i = 0; i < num_entries; i++) {
2219 if (!devinfo[i].ld_private.ops)
2220 continue;
2221 if (!devinfo[i].ld_private.ops->free)
2222 continue;
2223 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2224 }
2225 }
2226
2227 static struct nfs4_deviceid_node *
ff_layout_alloc_deviceid_node(struct nfs_server * server,struct pnfs_device * pdev,gfp_t gfp_flags)2228 ff_layout_alloc_deviceid_node(struct nfs_server *server,
2229 struct pnfs_device *pdev, gfp_t gfp_flags)
2230 {
2231 struct nfs4_ff_layout_ds *dsaddr;
2232
2233 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2234 if (!dsaddr)
2235 return NULL;
2236 return &dsaddr->id_node;
2237 }
2238
2239 static void
ff_layout_encode_layoutreturn(struct xdr_stream * xdr,const void * voidargs,const struct nfs4_xdr_opaque_data * ff_opaque)2240 ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
2241 const void *voidargs,
2242 const struct nfs4_xdr_opaque_data *ff_opaque)
2243 {
2244 const struct nfs4_layoutreturn_args *args = voidargs;
2245 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
2246 struct xdr_buf tmp_buf = {
2247 .head = {
2248 [0] = {
2249 .iov_base = page_address(ff_args->pages[0]),
2250 },
2251 },
2252 .buflen = PAGE_SIZE,
2253 };
2254 struct xdr_stream tmp_xdr;
2255 __be32 *start;
2256
2257 dprintk("%s: Begin\n", __func__);
2258
2259 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
2260
2261 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2262 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2263
2264 start = xdr_reserve_space(xdr, 4);
2265 *start = cpu_to_be32(tmp_buf.len);
2266 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
2267
2268 dprintk("%s: Return\n", __func__);
2269 }
2270
2271 static void
ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data * args)2272 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2273 {
2274 struct nfs4_flexfile_layoutreturn_args *ff_args;
2275
2276 if (!args->data)
2277 return;
2278 ff_args = args->data;
2279 args->data = NULL;
2280
2281 ff_layout_free_ds_ioerr(&ff_args->errors);
2282 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
2283
2284 put_page(ff_args->pages[0]);
2285 kfree(ff_args);
2286 }
2287
2288 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
2289 .encode = ff_layout_encode_layoutreturn,
2290 .free = ff_layout_free_layoutreturn,
2291 };
2292
2293 static int
ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args * args)2294 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2295 {
2296 struct nfs4_flexfile_layoutreturn_args *ff_args;
2297 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
2298
2299 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask());
2300 if (!ff_args)
2301 goto out_nomem;
2302 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask());
2303 if (!ff_args->pages[0])
2304 goto out_nomem_free;
2305
2306 INIT_LIST_HEAD(&ff_args->errors);
2307 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2308 &args->range, &ff_args->errors,
2309 FF_LAYOUTRETURN_MAXERR);
2310
2311 spin_lock(&args->inode->i_lock);
2312 ff_args->num_dev = ff_layout_mirror_prepare_stats(
2313 &ff_layout->generic_hdr, &ff_args->devinfo[0],
2314 ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN);
2315 spin_unlock(&args->inode->i_lock);
2316
2317 args->ld_private->ops = &layoutreturn_ops;
2318 args->ld_private->data = ff_args;
2319 return 0;
2320 out_nomem_free:
2321 kfree(ff_args);
2322 out_nomem:
2323 return -ENOMEM;
2324 }
2325
2326 #ifdef CONFIG_NFS_V4_2
2327 void
ff_layout_send_layouterror(struct pnfs_layout_segment * lseg)2328 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2329 {
2330 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2331 struct nfs42_layout_error *errors;
2332 LIST_HEAD(head);
2333
2334 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2335 return;
2336 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2337 if (list_empty(&head))
2338 return;
2339
2340 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors),
2341 nfs_io_gfp_mask());
2342 if (errors != NULL) {
2343 const struct nfs4_ff_layout_ds_err *pos;
2344 size_t n = 0;
2345
2346 list_for_each_entry(pos, &head, list) {
2347 errors[n].offset = pos->offset;
2348 errors[n].length = pos->length;
2349 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2350 errors[n].errors[0].dev_id = pos->deviceid;
2351 errors[n].errors[0].status = pos->status;
2352 errors[n].errors[0].opnum = pos->opnum;
2353 n++;
2354 if (!list_is_last(&pos->list, &head) &&
2355 n < NFS42_LAYOUTERROR_MAX)
2356 continue;
2357 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2358 break;
2359 n = 0;
2360 }
2361 kfree(errors);
2362 }
2363 ff_layout_free_ds_ioerr(&head);
2364 }
2365 #else
2366 void
ff_layout_send_layouterror(struct pnfs_layout_segment * lseg)2367 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2368 {
2369 }
2370 #endif
2371
2372 static int
ff_layout_ntop4(const struct sockaddr * sap,char * buf,const size_t buflen)2373 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2374 {
2375 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2376
2377 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2378 }
2379
2380 static size_t
ff_layout_ntop6_noscopeid(const struct sockaddr * sap,char * buf,const int buflen)2381 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2382 const int buflen)
2383 {
2384 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2385 const struct in6_addr *addr = &sin6->sin6_addr;
2386
2387 /*
2388 * RFC 4291, Section 2.2.2
2389 *
2390 * Shorthanded ANY address
2391 */
2392 if (ipv6_addr_any(addr))
2393 return snprintf(buf, buflen, "::");
2394
2395 /*
2396 * RFC 4291, Section 2.2.2
2397 *
2398 * Shorthanded loopback address
2399 */
2400 if (ipv6_addr_loopback(addr))
2401 return snprintf(buf, buflen, "::1");
2402
2403 /*
2404 * RFC 4291, Section 2.2.3
2405 *
2406 * Special presentation address format for mapped v4
2407 * addresses.
2408 */
2409 if (ipv6_addr_v4mapped(addr))
2410 return snprintf(buf, buflen, "::ffff:%pI4",
2411 &addr->s6_addr32[3]);
2412
2413 /*
2414 * RFC 4291, Section 2.2.1
2415 */
2416 return snprintf(buf, buflen, "%pI6c", addr);
2417 }
2418
2419 /* Derived from rpc_sockaddr2uaddr */
2420 static void
ff_layout_encode_netaddr(struct xdr_stream * xdr,struct nfs4_pnfs_ds_addr * da)2421 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2422 {
2423 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2424 char portbuf[RPCBIND_MAXUADDRPLEN];
2425 char addrbuf[RPCBIND_MAXUADDRLEN];
2426 unsigned short port;
2427 int len, netid_len;
2428 __be32 *p;
2429
2430 switch (sap->sa_family) {
2431 case AF_INET:
2432 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2433 return;
2434 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2435 break;
2436 case AF_INET6:
2437 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2438 return;
2439 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2440 break;
2441 default:
2442 WARN_ON_ONCE(1);
2443 return;
2444 }
2445
2446 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2447 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2448
2449 netid_len = strlen(da->da_netid);
2450 p = xdr_reserve_space(xdr, 4 + netid_len);
2451 xdr_encode_opaque(p, da->da_netid, netid_len);
2452
2453 p = xdr_reserve_space(xdr, 4 + len);
2454 xdr_encode_opaque(p, addrbuf, len);
2455 }
2456
2457 static void
ff_layout_encode_nfstime(struct xdr_stream * xdr,ktime_t t)2458 ff_layout_encode_nfstime(struct xdr_stream *xdr,
2459 ktime_t t)
2460 {
2461 struct timespec64 ts;
2462 __be32 *p;
2463
2464 p = xdr_reserve_space(xdr, 12);
2465 ts = ktime_to_timespec64(t);
2466 p = xdr_encode_hyper(p, ts.tv_sec);
2467 *p++ = cpu_to_be32(ts.tv_nsec);
2468 }
2469
2470 static void
ff_layout_encode_io_latency(struct xdr_stream * xdr,struct nfs4_ff_io_stat * stat)2471 ff_layout_encode_io_latency(struct xdr_stream *xdr,
2472 struct nfs4_ff_io_stat *stat)
2473 {
2474 __be32 *p;
2475
2476 p = xdr_reserve_space(xdr, 5 * 8);
2477 p = xdr_encode_hyper(p, stat->ops_requested);
2478 p = xdr_encode_hyper(p, stat->bytes_requested);
2479 p = xdr_encode_hyper(p, stat->ops_completed);
2480 p = xdr_encode_hyper(p, stat->bytes_completed);
2481 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2482 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2483 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2484 }
2485
2486 static void
ff_layout_encode_ff_layoutupdate(struct xdr_stream * xdr,const struct nfs42_layoutstat_devinfo * devinfo,struct nfs4_ff_layout_mirror * mirror)2487 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2488 const struct nfs42_layoutstat_devinfo *devinfo,
2489 struct nfs4_ff_layout_mirror *mirror)
2490 {
2491 struct nfs4_pnfs_ds_addr *da;
2492 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2493 struct nfs_fh *fh = &mirror->fh_versions[0];
2494 __be32 *p;
2495
2496 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2497 dprintk("%s: DS %s: encoding address %s\n",
2498 __func__, ds->ds_remotestr, da->da_remotestr);
2499 /* netaddr4 */
2500 ff_layout_encode_netaddr(xdr, da);
2501 /* nfs_fh4 */
2502 p = xdr_reserve_space(xdr, 4 + fh->size);
2503 xdr_encode_opaque(p, fh->data, fh->size);
2504 /* ff_io_latency4 read */
2505 spin_lock(&mirror->lock);
2506 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2507 /* ff_io_latency4 write */
2508 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2509 spin_unlock(&mirror->lock);
2510 /* nfstime4 */
2511 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2512 /* bool */
2513 p = xdr_reserve_space(xdr, 4);
2514 *p = cpu_to_be32(false);
2515 }
2516
2517 static void
ff_layout_encode_layoutstats(struct xdr_stream * xdr,const void * args,const struct nfs4_xdr_opaque_data * opaque)2518 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2519 const struct nfs4_xdr_opaque_data *opaque)
2520 {
2521 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2522 struct nfs42_layoutstat_devinfo, ld_private);
2523 __be32 *start;
2524
2525 /* layoutupdate length */
2526 start = xdr_reserve_space(xdr, 4);
2527 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
2528
2529 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2530 }
2531
2532 static void
ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data * opaque)2533 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2534 {
2535 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2536
2537 ff_layout_put_mirror(mirror);
2538 }
2539
2540 static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2541 .encode = ff_layout_encode_layoutstats,
2542 .free = ff_layout_free_layoutstats,
2543 };
2544
2545 static int
ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr * lo,struct nfs42_layoutstat_devinfo * devinfo,int dev_limit,enum nfs4_ff_op_type type)2546 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2547 struct nfs42_layoutstat_devinfo *devinfo,
2548 int dev_limit, enum nfs4_ff_op_type type)
2549 {
2550 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
2551 struct nfs4_ff_layout_mirror *mirror;
2552 struct nfs4_deviceid_node *dev;
2553 int i = 0;
2554
2555 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2556 if (i >= dev_limit)
2557 break;
2558 if (IS_ERR_OR_NULL(mirror->mirror_ds))
2559 continue;
2560 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL,
2561 &mirror->flags) &&
2562 type != NFS4_FF_OP_LAYOUTRETURN)
2563 continue;
2564 /* mirror refcount put in cleanup_layoutstats */
2565 if (!refcount_inc_not_zero(&mirror->ref))
2566 continue;
2567 dev = &mirror->mirror_ds->id_node;
2568 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
2569 devinfo->offset = 0;
2570 devinfo->length = NFS4_MAX_UINT64;
2571 spin_lock(&mirror->lock);
2572 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
2573 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
2574 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
2575 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2576 spin_unlock(&mirror->lock);
2577 devinfo->layout_type = LAYOUT_FLEX_FILES;
2578 devinfo->ld_private.ops = &layoutstat_ops;
2579 devinfo->ld_private.data = mirror;
2580
2581 devinfo++;
2582 i++;
2583 }
2584 return i;
2585 }
2586
ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args * args)2587 static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2588 {
2589 struct pnfs_layout_hdr *lo;
2590 struct nfs4_flexfile_layout *ff_layout;
2591 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
2592
2593 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
2594 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo),
2595 nfs_io_gfp_mask());
2596 if (!args->devinfo)
2597 return -ENOMEM;
2598
2599 spin_lock(&args->inode->i_lock);
2600 lo = NFS_I(args->inode)->layout;
2601 if (lo && pnfs_layout_is_valid(lo)) {
2602 ff_layout = FF_LAYOUT_FROM_HDR(lo);
2603 args->num_dev = ff_layout_mirror_prepare_stats(
2604 &ff_layout->generic_hdr, &args->devinfo[0], dev_count,
2605 NFS4_FF_OP_LAYOUTSTATS);
2606 } else
2607 args->num_dev = 0;
2608 spin_unlock(&args->inode->i_lock);
2609 if (!args->num_dev) {
2610 kfree(args->devinfo);
2611 args->devinfo = NULL;
2612 return -ENOENT;
2613 }
2614
2615 return 0;
2616 }
2617
2618 static int
ff_layout_set_layoutdriver(struct nfs_server * server,const struct nfs_fh * dummy)2619 ff_layout_set_layoutdriver(struct nfs_server *server,
2620 const struct nfs_fh *dummy)
2621 {
2622 #if IS_ENABLED(CONFIG_NFS_V4_2)
2623 server->caps |= NFS_CAP_LAYOUTSTATS | NFS_CAP_REBOOT_LAYOUTRETURN;
2624 #endif
2625 return 0;
2626 }
2627
2628 static const struct pnfs_commit_ops ff_layout_commit_ops = {
2629 .setup_ds_info = ff_layout_setup_ds_info,
2630 .release_ds_info = ff_layout_release_ds_info,
2631 .mark_request_commit = pnfs_layout_mark_request_commit,
2632 .clear_request_commit = pnfs_generic_clear_request_commit,
2633 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2634 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2635 .commit_pagelist = ff_layout_commit_pagelist,
2636 };
2637
2638 static struct pnfs_layoutdriver_type flexfilelayout_type = {
2639 .id = LAYOUT_FLEX_FILES,
2640 .name = "LAYOUT_FLEX_FILES",
2641 .owner = THIS_MODULE,
2642 .flags = PNFS_LAYOUTGET_ON_OPEN,
2643 .max_layoutget_response = 4096, /* 1 page or so... */
2644 .set_layoutdriver = ff_layout_set_layoutdriver,
2645 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2646 .free_layout_hdr = ff_layout_free_layout_hdr,
2647 .alloc_lseg = ff_layout_alloc_lseg,
2648 .free_lseg = ff_layout_free_lseg,
2649 .add_lseg = ff_layout_add_lseg,
2650 .pg_read_ops = &ff_layout_pg_read_ops,
2651 .pg_write_ops = &ff_layout_pg_write_ops,
2652 .get_ds_info = ff_layout_get_ds_info,
2653 .free_deviceid_node = ff_layout_free_deviceid_node,
2654 .read_pagelist = ff_layout_read_pagelist,
2655 .write_pagelist = ff_layout_write_pagelist,
2656 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
2657 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
2658 .sync = pnfs_nfs_generic_sync,
2659 .prepare_layoutstats = ff_layout_prepare_layoutstats,
2660 .cancel_io = ff_layout_cancel_io,
2661 };
2662
nfs4flexfilelayout_init(void)2663 static int __init nfs4flexfilelayout_init(void)
2664 {
2665 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2666 __func__);
2667 return pnfs_register_layoutdriver(&flexfilelayout_type);
2668 }
2669
nfs4flexfilelayout_exit(void)2670 static void __exit nfs4flexfilelayout_exit(void)
2671 {
2672 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2673 __func__);
2674 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2675 }
2676
2677 MODULE_ALIAS("nfs-layouttype4-4");
2678
2679 MODULE_LICENSE("GPL");
2680 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2681
2682 module_init(nfs4flexfilelayout_init);
2683 module_exit(nfs4flexfilelayout_exit);
2684
2685 module_param(io_maxretrans, ushort, 0644);
2686 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client "
2687 "retries an I/O request before returning an error. ");
2688