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NFS/flexfiles: Simplify nfs4_ff_layout_select_ds_fh()
[people/ms/linux.git] / fs / nfs / flexfilelayout / flexfilelayout.c
CommitLineData
d67ae825
TH		 1/*
2 * Module for pnfs flexfile layout driver.
3 *
4 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
5 *
6 * Tao Peng <bergwolf@primarydata.com>
7 */
8
9#include <linux/nfs_fs.h>
10#include <linux/nfs_page.h>
11#include <linux/module.h>
97f68c6b 12#include <linux/sched/mm.h>
d67ae825
TH		 13
14#include <linux/sunrpc/metrics.h>
d67ae825
TH		 15
16#include "flexfilelayout.h"
17#include "../nfs4session.h"
40c64c26 18#include "../nfs4idmap.h"
d67ae825
TH		 19#include "../internal.h"
20#include "../delegation.h"
21#include "../nfs4trace.h"
22#include "../iostat.h"
23#include "../nfs.h"
ad4dc53e 24#include "../nfs42.h"
d67ae825
TH		 25
26#define NFSDBG_FACILITY NFSDBG_PNFS_LD
27
28#define FF_LAYOUT_POLL_RETRY_MAX (15*HZ)
5b9b3c85
TM		 29#define FF_LAYOUTRETURN_MAXERR 20
30
54e4a0df
TM		 31static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
32 struct nfs_pgio_header *hdr);
230bc962
TM		 33static int ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
34 struct nfs42_layoutstat_devinfo *devinfo,
35 int dev_limit);
36static void ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
37 const struct nfs42_layoutstat_devinfo *devinfo,
38 struct nfs4_ff_layout_mirror *mirror);
54e4a0df 39
d67ae825
TH		 40static struct pnfs_layout_hdr *
41ff_layout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
42{
43 struct nfs4_flexfile_layout *ffl;
44
45 ffl = kzalloc(sizeof(*ffl), gfp_flags);
46 if (ffl) {
47 INIT_LIST_HEAD(&ffl->error_list);
266d12d4 48 INIT_LIST_HEAD(&ffl->mirrors);
1c8d477a 49 ffl->last_report_time = ktime_get();
d67ae825
TH		 50 return &ffl->generic_hdr;
51 } else
52 return NULL;
53}
54
55static void
56ff_layout_free_layout_hdr(struct pnfs_layout_hdr *lo)
57{
58 struct nfs4_ff_layout_ds_err *err, *n;
59
60 list_for_each_entry_safe(err, n, &FF_LAYOUT_FROM_HDR(lo)->error_list,
61 list) {
62 list_del(&err->list);
63 kfree(err);
64 }
65 kfree(FF_LAYOUT_FROM_HDR(lo));
66}
67
93b717fd 68static int decode_pnfs_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
d67ae825
TH		 69{
70 __be32 *p;
71
72 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
73 if (unlikely(p == NULL))
74 return -ENOBUFS;
93b717fd
TM		 75 stateid->type = NFS4_PNFS_DS_STATEID_TYPE;
76 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
d67ae825
TH		 77 dprintk("%s: stateid id= [%x%x%x%x]\n", __func__,
78 p[0], p[1], p[2], p[3]);
79 return 0;
80}
81
82static int decode_deviceid(struct xdr_stream *xdr, struct nfs4_deviceid *devid)
83{
84 __be32 *p;
85
86 p = xdr_inline_decode(xdr, NFS4_DEVICEID4_SIZE);
87 if (unlikely(!p))
88 return -ENOBUFS;
89 memcpy(devid, p, NFS4_DEVICEID4_SIZE);
90 nfs4_print_deviceid(devid);
91 return 0;
92}
93
94static int decode_nfs_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
95{
96 __be32 *p;
97
98 p = xdr_inline_decode(xdr, 4);
99 if (unlikely(!p))
100 return -ENOBUFS;
101 fh->size = be32_to_cpup(p++);
102 if (fh->size > sizeof(struct nfs_fh)) {
103 printk(KERN_ERR "NFS flexfiles: Too big fh received %d\n",
104 fh->size);
105 return -EOVERFLOW;
106 }
107 /* fh.data */
108 p = xdr_inline_decode(xdr, fh->size);
109 if (unlikely(!p))
110 return -ENOBUFS;
111 memcpy(&fh->data, p, fh->size);
112 dprintk("%s: fh len %d\n", __func__, fh->size);
113
114 return 0;
115}
116
117/*
118 * Currently only stringified uids and gids are accepted.
119 * I.e., kerberos is not supported to the DSes, so no pricipals.
120 *
121 * That means that one common function will suffice, but when
122 * principals are added, this should be split to accomodate
123 * calls to both nfs_map_name_to_uid() and nfs_map_group_to_gid().
124 */
125static int
126decode_name(struct xdr_stream *xdr, u32 *id)
127{
128 __be32 *p;
129 int len;
130
131 /* opaque_length(4)*/
132 p = xdr_inline_decode(xdr, 4);
133 if (unlikely(!p))
134 return -ENOBUFS;
135 len = be32_to_cpup(p++);
136 if (len < 0)
137 return -EINVAL;
138
139 dprintk("%s: len %u\n", __func__, len);
140
141 /* opaque body */
142 p = xdr_inline_decode(xdr, len);
143 if (unlikely(!p))
144 return -ENOBUFS;
145
146 if (!nfs_map_string_to_numeric((char *)p, len, id))
147 return -EINVAL;
148
149 return 0;
150}
151
266d12d4
TM		 152static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
153 const struct nfs4_ff_layout_mirror *m2)
154{
155 int i, j;
156
157 if (m1->fh_versions_cnt != m2->fh_versions_cnt)
158 return false;
159 for (i = 0; i < m1->fh_versions_cnt; i++) {
160 bool found_fh = false;
86fb449b 161 for (j = 0; j < m2->fh_versions_cnt; j++) {
266d12d4
TM		 162 if (nfs_compare_fh(&m1->fh_versions[i],
163 &m2->fh_versions[j]) == 0) {
164 found_fh = true;
165 break;
166 }
167 }
168 if (!found_fh)
169 return false;
170 }
171 return true;
172}
173
174static struct nfs4_ff_layout_mirror *
175ff_layout_add_mirror(struct pnfs_layout_hdr *lo,
176 struct nfs4_ff_layout_mirror *mirror)
177{
178 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
179 struct nfs4_ff_layout_mirror *pos;
180 struct inode *inode = lo->plh_inode;
181
182 spin_lock(&inode->i_lock);
183 list_for_each_entry(pos, &ff_layout->mirrors, mirrors) {
65990d1a 184 if (memcmp(&mirror->devid, &pos->devid, sizeof(pos->devid)) != 0)
266d12d4
TM		 185 continue;
186 if (!ff_mirror_match_fh(mirror, pos))
187 continue;
81a090b9 188 if (refcount_inc_not_zero(&pos->ref)) {
266d12d4
TM		 189 spin_unlock(&inode->i_lock);
190 return pos;
191 }
192 }
193 list_add(&mirror->mirrors, &ff_layout->mirrors);
194 mirror->layout = lo;
195 spin_unlock(&inode->i_lock);
196 return mirror;
197}
198
e3b1df2d 199static void
266d12d4
TM		 200ff_layout_remove_mirror(struct nfs4_ff_layout_mirror *mirror)
201{
202 struct inode *inode;
203 if (mirror->layout == NULL)
204 return;
205 inode = mirror->layout->plh_inode;
206 spin_lock(&inode->i_lock);
207 list_del(&mirror->mirrors);
208 spin_unlock(&inode->i_lock);
209 mirror->layout = NULL;
210}
211
28a0d72c
TM		 212static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
213{
214 struct nfs4_ff_layout_mirror *mirror;
215
216 mirror = kzalloc(sizeof(*mirror), gfp_flags);
217 if (mirror != NULL) {
218 spin_lock_init(&mirror->lock);
81a090b9 219 refcount_set(&mirror->ref, 1);
266d12d4 220 INIT_LIST_HEAD(&mirror->mirrors);
28a0d72c
TM		 221 }
222 return mirror;
223}
224
225static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
226{
a52458b4 227 const struct cred *cred;
3064b686 228
266d12d4 229 ff_layout_remove_mirror(mirror);
28a0d72c 230 kfree(mirror->fh_versions);
3064b686 231 cred = rcu_access_pointer(mirror->ro_cred);
a52458b4 232 put_cred(cred);
3064b686 233 cred = rcu_access_pointer(mirror->rw_cred);
a52458b4 234 put_cred(cred);
28a0d72c
TM		 235 nfs4_ff_layout_put_deviceid(mirror->mirror_ds);
236 kfree(mirror);
237}
238
239static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror)
240{
81a090b9 241 if (mirror != NULL && refcount_dec_and_test(&mirror->ref))
28a0d72c
TM		 242 ff_layout_free_mirror(mirror);
243}
244
d67ae825
TH		 245static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls)
246{
247 int i;
248
249 if (fls->mirror_array) {
250 for (i = 0; i < fls->mirror_array_cnt; i++) {
251 /* normally mirror_ds is freed in
252 * .free_deviceid_node but we still do it here
253 * for .alloc_lseg error path */
28a0d72c 254 ff_layout_put_mirror(fls->mirror_array[i]);
d67ae825
TH		 255 }
256 kfree(fls->mirror_array);
257 fls->mirror_array = NULL;
258 }
259}
260
261static int ff_layout_check_layout(struct nfs4_layoutget_res *lgr)
262{
263 int ret = 0;
264
265 dprintk("--> %s\n", __func__);
266
267 /* FIXME: remove this check when layout segment support is added */
268 if (lgr->range.offset != 0 ||
269 lgr->range.length != NFS4_MAX_UINT64) {
270 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
271 __func__);
272 ret = -EINVAL;
273 }
274
275 dprintk("--> %s returns %d\n", __func__, ret);
276 return ret;
277}
278
279static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls)
280{
281 if (fls) {
282 ff_layout_free_mirror_array(fls);
283 kfree(fls);
284 }
285}
286
0762ed2c
TM		 287static bool
288ff_lseg_range_is_after(const struct pnfs_layout_range *l1,
289 const struct pnfs_layout_range *l2)
290{
291 u64 end1, end2;
292
293 if (l1->iomode != l2->iomode)
294 return l1->iomode != IOMODE_READ;
295 end1 = pnfs_calc_offset_end(l1->offset, l1->length);
296 end2 = pnfs_calc_offset_end(l2->offset, l2->length);
297 if (end1 < l2->offset)
298 return false;
299 if (end2 < l1->offset)
300 return true;
301 return l2->offset <= l1->offset;
302}
303
304static bool
305ff_lseg_merge(struct pnfs_layout_segment *new,
306 struct pnfs_layout_segment *old)
307{
308 u64 new_end, old_end;
309
ee26bdd6
JL		 310 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags))
311 return false;
0762ed2c
TM		 312 if (new->pls_range.iomode != old->pls_range.iomode)
313 return false;
314 old_end = pnfs_calc_offset_end(old->pls_range.offset,
315 old->pls_range.length);
316 if (old_end < new->pls_range.offset)
317 return false;
318 new_end = pnfs_calc_offset_end(new->pls_range.offset,
319 new->pls_range.length);
320 if (new_end < old->pls_range.offset)
321 return false;
322
323 /* Mergeable: copy info from 'old' to 'new' */
324 if (new_end < old_end)
325 new_end = old_end;
326 if (new->pls_range.offset < old->pls_range.offset)
327 new->pls_range.offset = old->pls_range.offset;
328 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset,
329 new_end);
330 if (test_bit(NFS_LSEG_ROC, &old->pls_flags))
331 set_bit(NFS_LSEG_ROC, &new->pls_flags);
0762ed2c
TM		 332 return true;
333}
334
335static void
336ff_layout_add_lseg(struct pnfs_layout_hdr *lo,
337 struct pnfs_layout_segment *lseg,
338 struct list_head *free_me)
339{
340 pnfs_generic_layout_insert_lseg(lo, lseg,
341 ff_lseg_range_is_after,
342 ff_lseg_merge,
343 free_me);
344}
345
d67ae825
TH		 346static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls)
347{
d67ae825
TH		 348 int i, j;
349
350 for (i = 0; i < fls->mirror_array_cnt - 1; i++) {
351 for (j = i + 1; j < fls->mirror_array_cnt; j++)
352 if (fls->mirror_array[i]->efficiency <
455b6ee6
FF		 353 fls->mirror_array[j]->efficiency)
354 swap(fls->mirror_array[i],
355 fls->mirror_array[j]);
d67ae825
TH		 356 }
357}
358
359static struct pnfs_layout_segment *
360ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
361 struct nfs4_layoutget_res *lgr,
362 gfp_t gfp_flags)
363{
364 struct pnfs_layout_segment *ret;
365 struct nfs4_ff_layout_segment *fls = NULL;
366 struct xdr_stream stream;
367 struct xdr_buf buf;
368 struct page *scratch;
369 u64 stripe_unit;
370 u32 mirror_array_cnt;
371 __be32 *p;
372 int i, rc;
373
374 dprintk("--> %s\n", __func__);
375 scratch = alloc_page(gfp_flags);
376 if (!scratch)
377 return ERR_PTR(-ENOMEM);
378
379 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages,
380 lgr->layoutp->len);
381 xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
382
383 /* stripe unit and mirror_array_cnt */
384 rc = -EIO;
385 p = xdr_inline_decode(&stream, 8 + 4);
386 if (!p)
387 goto out_err_free;
388
389 p = xdr_decode_hyper(p, &stripe_unit);
390 mirror_array_cnt = be32_to_cpup(p++);
391 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__,
392 stripe_unit, mirror_array_cnt);
393
394 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT ||
395 mirror_array_cnt == 0)
396 goto out_err_free;
397
398 rc = -ENOMEM;
399 fls = kzalloc(sizeof(*fls), gfp_flags);
400 if (!fls)
401 goto out_err_free;
402
403 fls->mirror_array_cnt = mirror_array_cnt;
404 fls->stripe_unit = stripe_unit;
405 fls->mirror_array = kcalloc(fls->mirror_array_cnt,
406 sizeof(fls->mirror_array[0]), gfp_flags);
407 if (fls->mirror_array == NULL)
408 goto out_err_free;
409
410 for (i = 0; i < fls->mirror_array_cnt; i++) {
266d12d4 411 struct nfs4_ff_layout_mirror *mirror;
97f68c6b 412 struct cred *kcred;
762bb7e9 413 const struct cred __rcu *cred;
8276c902
N		 414 kuid_t uid;
415 kgid_t gid;
90a0be00 416 u32 ds_count, fh_count, id;
d67ae825
TH		 417 int j;
418
419 rc = -EIO;
420 p = xdr_inline_decode(&stream, 4);
421 if (!p)
422 goto out_err_free;
423 ds_count = be32_to_cpup(p);
424
425 /* FIXME: allow for striping? */
426 if (ds_count != 1)
427 goto out_err_free;
428
28a0d72c 429 fls->mirror_array[i] = ff_layout_alloc_mirror(gfp_flags);
d67ae825
TH		 430 if (fls->mirror_array[i] == NULL) {
431 rc = -ENOMEM;
432 goto out_err_free;
433 }
434
d67ae825
TH		 435 fls->mirror_array[i]->ds_count = ds_count;
436
437 /* deviceid */
65990d1a 438 rc = decode_deviceid(&stream, &fls->mirror_array[i]->devid);
d67ae825
TH		 439 if (rc)
440 goto out_err_free;
441
d67ae825
TH		 442 /* efficiency */
443 rc = -EIO;
444 p = xdr_inline_decode(&stream, 4);
445 if (!p)
446 goto out_err_free;
447 fls->mirror_array[i]->efficiency = be32_to_cpup(p);
448
449 /* stateid */
93b717fd 450 rc = decode_pnfs_stateid(&stream, &fls->mirror_array[i]->stateid);
d67ae825
TH		 451 if (rc)
452 goto out_err_free;
453
454 /* fh */
662f9a10 455 rc = -EIO;
d67ae825
TH		 456 p = xdr_inline_decode(&stream, 4);
457 if (!p)
458 goto out_err_free;
459 fh_count = be32_to_cpup(p);
460
461 fls->mirror_array[i]->fh_versions =
6396bb22 462 kcalloc(fh_count, sizeof(struct nfs_fh),
d67ae825
TH		 463 gfp_flags);
464 if (fls->mirror_array[i]->fh_versions == NULL) {
465 rc = -ENOMEM;
466 goto out_err_free;
467 }
468
469 for (j = 0; j < fh_count; j++) {
470 rc = decode_nfs_fh(&stream,
471 &fls->mirror_array[i]->fh_versions[j]);
472 if (rc)
473 goto out_err_free;
474 }
475
476 fls->mirror_array[i]->fh_versions_cnt = fh_count;
477
478 /* user */
90a0be00 479 rc = decode_name(&stream, &id);
d67ae825
TH		 480 if (rc)
481 goto out_err_free;
482
8276c902 483 uid = make_kuid(&init_user_ns, id);
90a0be00 484
d67ae825 485 /* group */
90a0be00 486 rc = decode_name(&stream, &id);
d67ae825
TH		 487 if (rc)
488 goto out_err_free;
489
8276c902 490 gid = make_kgid(&init_user_ns, id);
90a0be00 491
97f68c6b
N		 492 if (gfp_flags & __GFP_FS)
493 kcred = prepare_kernel_cred(NULL);
494 else {
495 unsigned int nofs_flags = memalloc_nofs_save();
496 kcred = prepare_kernel_cred(NULL);
497 memalloc_nofs_restore(nofs_flags);
498 }
499 rc = -ENOMEM;
500 if (!kcred)
501 goto out_err_free;
8276c902
N		 502 kcred->fsuid = uid;
503 kcred->fsgid = gid;
762bb7e9 504 cred = RCU_INITIALIZER(kcred);
90a0be00 505
3064b686
JL		 506 if (lgr->range.iomode == IOMODE_READ)
507 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
508 else
509 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
90a0be00 510
266d12d4
TM		 511 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]);
512 if (mirror != fls->mirror_array[i]) {
90a0be00 513 /* swap cred ptrs so free_mirror will clean up old */
3064b686
JL		 514 if (lgr->range.iomode == IOMODE_READ) {
515 cred = xchg(&mirror->ro_cred, cred);
516 rcu_assign_pointer(fls->mirror_array[i]->ro_cred, cred);
517 } else {
518 cred = xchg(&mirror->rw_cred, cred);
519 rcu_assign_pointer(fls->mirror_array[i]->rw_cred, cred);
520 }
266d12d4
TM		 521 ff_layout_free_mirror(fls->mirror_array[i]);
522 fls->mirror_array[i] = mirror;
523 }
524
3064b686
JL		 525 dprintk("%s: iomode %s uid %u gid %u\n", __func__,
526 lgr->range.iomode == IOMODE_READ ? "READ" : "RW",
8276c902
N		 527 from_kuid(&init_user_ns, uid),
528 from_kgid(&init_user_ns, gid));
d67ae825
TH		 529 }
530
c0f5f505 531 p = xdr_inline_decode(&stream, 4);
d0379a5d
TM		 532 if (!p)
533 goto out_sort_mirrors;
534 fls->flags = be32_to_cpup(p);
535
536 p = xdr_inline_decode(&stream, 4);
537 if (!p)
538 goto out_sort_mirrors;
539 for (i=0; i < fls->mirror_array_cnt; i++)
540 fls->mirror_array[i]->report_interval = be32_to_cpup(p);
c0f5f505 541
d0379a5d 542out_sort_mirrors:
d67ae825
TH		 543 ff_layout_sort_mirrors(fls);
544 rc = ff_layout_check_layout(lgr);
545 if (rc)
546 goto out_err_free;
d67ae825
TH		 547 ret = &fls->generic_hdr;
548 dprintk("<-- %s (success)\n", __func__);
549out_free_page:
550 __free_page(scratch);
551 return ret;
552out_err_free:
553 _ff_layout_free_lseg(fls);
554 ret = ERR_PTR(rc);
555 dprintk("<-- %s (%d)\n", __func__, rc);
556 goto out_free_page;
557}
558
559static bool ff_layout_has_rw_segments(struct pnfs_layout_hdr *layout)
560{
561 struct pnfs_layout_segment *lseg;
562
563 list_for_each_entry(lseg, &layout->plh_segs, pls_list)
564 if (lseg->pls_range.iomode == IOMODE_RW)
565 return true;
566
567 return false;
568}
569
570static void
571ff_layout_free_lseg(struct pnfs_layout_segment *lseg)
572{
573 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
d67ae825
TH		 574
575 dprintk("--> %s\n", __func__);
576
d67ae825
TH		 577 if (lseg->pls_range.iomode == IOMODE_RW) {
578 struct nfs4_flexfile_layout *ffl;
579 struct inode *inode;
580
581 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout);
582 inode = ffl->generic_hdr.plh_inode;
583 spin_lock(&inode->i_lock);
584 if (!ff_layout_has_rw_segments(lseg->pls_layout)) {
585 ffl->commit_info.nbuckets = 0;
586 kfree(ffl->commit_info.buckets);
587 ffl->commit_info.buckets = NULL;
588 }
589 spin_unlock(&inode->i_lock);
590 }
591 _ff_layout_free_lseg(fls);
592}
593
594/* Return 1 until we have multiple lsegs support */
595static int
596ff_layout_get_lseg_count(struct nfs4_ff_layout_segment *fls)
597{
598 return 1;
599}
600
abcb7bfc 601static void
e76d28dd 602nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 603{
9bbd9bb4
PT		 604 /* first IO request? */
605 if (atomic_inc_return(&timer->n_ops) == 1) {
e76d28dd 606 timer->start_time = now;
abcb7bfc
TM		 607 }
608}
609
610static ktime_t
e76d28dd 611nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now)
abcb7bfc 612{
e76d28dd 613 ktime_t start;
abcb7bfc 614
9bbd9bb4
PT		 615 if (atomic_dec_return(&timer->n_ops) < 0)
616 WARN_ON_ONCE(1);
617
9bbd9bb4
PT		 618 start = timer->start_time;
619 timer->start_time = now;
abcb7bfc
TM		 620 return ktime_sub(now, start);
621}
622
97ba375b 623static bool
d983803d 624nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror,
e76d28dd
TM		 625 struct nfs4_ff_layoutstat *layoutstat,
626 ktime_t now)
abcb7bfc 627{
bbf58bf3 628 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
1c8d477a 629 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
d983803d 630
e76d28dd 631 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
1f3a8e49 632 if (!mirror->start_time)
9bbd9bb4 633 mirror->start_time = now;
d0379a5d
TM		 634 if (mirror->report_interval != 0)
635 report_interval = (s64)mirror->report_interval * 1000LL;
636 else if (layoutstats_timer != 0)
bbf58bf3 637 report_interval = (s64)layoutstats_timer * 1000LL;
1c8d477a 638 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
bbf58bf3 639 report_interval) {
1c8d477a 640 ffl->last_report_time = now;
97ba375b
PT		 641 return true;
642 }
643
644 return false;
abcb7bfc
TM		 645}
646
647static void
648nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat,
649 __u64 requested)
650{
651 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
652
653 iostat->ops_requested++;
654 iostat->bytes_requested += requested;
655}
656
657static void
658nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat,
659 __u64 requested,
660 __u64 completed,
e76d28dd
TM		 661 ktime_t time_completed,
662 ktime_t time_started)
abcb7bfc
TM		 663{
664 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat;
e76d28dd 665 ktime_t completion_time = ktime_sub(time_completed, time_started);
abcb7bfc
TM		 666 ktime_t timer;
667
668 iostat->ops_completed++;
669 iostat->bytes_completed += completed;
670 iostat->bytes_not_delivered += requested - completed;
671
e76d28dd 672 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed);
abcb7bfc
TM		 673 iostat->total_busy_time =
674 ktime_add(iostat->total_busy_time, timer);
675 iostat->aggregate_completion_time =
e76d28dd
TM		 676 ktime_add(iostat->aggregate_completion_time,
677 completion_time);
abcb7bfc
TM		 678}
679
680static void
0b7baf94
TM		 681nfs4_ff_layout_stat_io_start_read(struct inode *inode,
682 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 683 __u64 requested, ktime_t now)
abcb7bfc 684{
97ba375b
PT		 685 bool report;
686
abcb7bfc 687 spin_lock(&mirror->lock);
e76d28dd 688 report = nfs4_ff_layoutstat_start_io(mirror, &mirror->read_stat, now);
abcb7bfc 689 nfs4_ff_layout_stat_io_update_requested(&mirror->read_stat, requested);
06946c6a 690 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 691 spin_unlock(&mirror->lock);
97ba375b
PT		 692
693 if (report)
0b7baf94 694 pnfs_report_layoutstat(inode, GFP_KERNEL);
abcb7bfc
TM		 695}
696
697static void
698nfs4_ff_layout_stat_io_end_read(struct rpc_task *task,
699 struct nfs4_ff_layout_mirror *mirror,
700 __u64 requested,
701 __u64 completed)
702{
703 spin_lock(&mirror->lock);
704 nfs4_ff_layout_stat_io_update_completed(&mirror->read_stat,
705 requested, completed,
e76d28dd 706 ktime_get(), task->tk_start);
06946c6a 707 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 708 spin_unlock(&mirror->lock);
709}
710
711static void
0b7baf94
TM		 712nfs4_ff_layout_stat_io_start_write(struct inode *inode,
713 struct nfs4_ff_layout_mirror *mirror,
e76d28dd 714 __u64 requested, ktime_t now)
abcb7bfc 715{
97ba375b
PT		 716 bool report;
717
abcb7bfc 718 spin_lock(&mirror->lock);
e76d28dd 719 report = nfs4_ff_layoutstat_start_io(mirror , &mirror->write_stat, now);
abcb7bfc 720 nfs4_ff_layout_stat_io_update_requested(&mirror->write_stat, requested);
06946c6a 721 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc 722 spin_unlock(&mirror->lock);
97ba375b
PT		 723
724 if (report)
0b7baf94 725 pnfs_report_layoutstat(inode, GFP_NOIO);
abcb7bfc
TM		 726}
727
728static void
729nfs4_ff_layout_stat_io_end_write(struct rpc_task *task,
730 struct nfs4_ff_layout_mirror *mirror,
731 __u64 requested,
732 __u64 completed,
733 enum nfs3_stable_how committed)
734{
735 if (committed == NFS_UNSTABLE)
736 requested = completed = 0;
737
738 spin_lock(&mirror->lock);
739 nfs4_ff_layout_stat_io_update_completed(&mirror->write_stat,
e76d28dd 740 requested, completed, ktime_get(), task->tk_start);
06946c6a 741 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags);
abcb7bfc
TM		 742 spin_unlock(&mirror->lock);
743}
744
d67ae825
TH		 745static int
746ff_layout_alloc_commit_info(struct pnfs_layout_segment *lseg,
747 struct nfs_commit_info *cinfo,
748 gfp_t gfp_flags)
749{
750 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
751 struct pnfs_commit_bucket *buckets;
752 int size;
753
754 if (cinfo->ds->nbuckets != 0) {
755 /* This assumes there is only one RW lseg per file.
756 * To support multiple lseg per file, we need to
757 * change struct pnfs_commit_bucket to allow dynamic
758 * increasing nbuckets.
759 */
760 return 0;
761 }
762
763 size = ff_layout_get_lseg_count(fls) * FF_LAYOUT_MIRROR_COUNT(lseg);
764
765 buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
766 gfp_flags);
767 if (!buckets)
768 return -ENOMEM;
769 else {
770 int i;
771
fe238e60 772 spin_lock(&cinfo->inode->i_lock);
d67ae825
TH		 773 if (cinfo->ds->nbuckets != 0)
774 kfree(buckets);
775 else {
776 cinfo->ds->buckets = buckets;
777 cinfo->ds->nbuckets = size;
778 for (i = 0; i < size; i++) {
779 INIT_LIST_HEAD(&buckets[i].written);
780 INIT_LIST_HEAD(&buckets[i].committing);
781 /* mark direct verifier as unset */
782 buckets[i].direct_verf.committed =
783 NFS_INVALID_STABLE_HOW;
784 }
785 }
fe238e60 786 spin_unlock(&cinfo->inode->i_lock);
d67ae825
TH		 787 return 0;
788 }
789}
790
76c66905
TM		 791static void
792ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, int idx)
793{
794 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
795
796 if (devid)
797 nfs4_mark_deviceid_unavailable(devid);
798}
799
800static void
801ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, int idx)
802{
803 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
804
805 if (devid)
806 nfs4_mark_deviceid_available(devid);
807}
808
d67ae825 809static struct nfs4_pnfs_ds *
76c66905
TM		 810ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg,
811 int start_idx, int *best_idx,
812 bool check_device)
d67ae825 813{
13544412 814 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg);
2444ff27 815 struct nfs4_ff_layout_mirror *mirror;
d67ae825 816 struct nfs4_pnfs_ds *ds;
3dc14735 817 bool fail_return = false;
d67ae825
TH		 818 int idx;
819
76c66905 820 /* mirrors are initially sorted by efficiency */
13544412 821 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) {
3dc14735 822 if (idx+1 == fls->mirror_array_cnt)
76c66905 823 fail_return = !check_device;
2444ff27
TM		 824
825 mirror = FF_LAYOUT_COMP(lseg, idx);
76c66905
TM		 826 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, fail_return);
827 if (!ds)
2444ff27
TM		 828 continue;
829
76c66905
TM		 830 if (check_device &&
831 nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node))
832 continue;
833
834 *best_idx = idx;
835 return ds;
d67ae825
TH		 836 }
837
838 return NULL;
839}
840
76c66905
TM		 841static struct nfs4_pnfs_ds *
842ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg,
843 int start_idx, int *best_idx)
844{
845 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, false);
846}
847
848static struct nfs4_pnfs_ds *
849ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg,
850 int start_idx, int *best_idx)
851{
852 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, true);
853}
854
855static struct nfs4_pnfs_ds *
856ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg,
857 int start_idx, int *best_idx)
858{
859 struct nfs4_pnfs_ds *ds;
860
861 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx);
862 if (ds)
863 return ds;
864 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx);
865}
866
c7d73af2
TH		 867static void
868ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
869 struct nfs_page *req,
870 bool strict_iomode)
871{
c7d73af2
TH		 872 pnfs_put_lseg(pgio->pg_lseg);
873 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
874 req->wb_context,
875 0,
876 NFS4_MAX_UINT64,
877 IOMODE_READ,
878 strict_iomode,
879 GFP_KERNEL);
880 if (IS_ERR(pgio->pg_lseg)) {
881 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
882 pgio->pg_lseg = NULL;
883 }
c7d73af2
TH		 884}
885
d67ae825
TH		 886static void
887ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
888 struct nfs_page *req)
889{
890 struct nfs_pgio_mirror *pgm;
891 struct nfs4_ff_layout_mirror *mirror;
892 struct nfs4_pnfs_ds *ds;
893 int ds_idx;
894
3dc14735 895retry:
b3230e80 896 pnfs_generic_pg_check_layout(pgio);
d67ae825 897 /* Use full layout for now */
1c1aeaf1 898 if (!pgio->pg_lseg) {
c7d73af2 899 ff_layout_pg_get_read(pgio, req, false);
1c1aeaf1
TM		 900 if (!pgio->pg_lseg)
901 goto out_nolseg;
902 }
903 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) {
c7d73af2 904 ff_layout_pg_get_read(pgio, req, true);
1c1aeaf1
TM		 905 if (!pgio->pg_lseg)
906 goto out_nolseg;
907 }
d67ae825 908
13544412 909 ds = ff_layout_choose_best_ds_for_read(pgio->pg_lseg, 0, &ds_idx);
446ca219 910 if (!ds) {
3dc14735 911 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 912 goto out_mds;
3dc14735
TM		 913 pnfs_put_lseg(pgio->pg_lseg);
914 pgio->pg_lseg = NULL;
915 /* Sleep for 1 second before retrying */
916 ssleep(1);
917 goto retry;
446ca219
TH		 918 }
919
d67ae825
TH		 920 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx);
921
922 pgio->pg_mirror_idx = ds_idx;
923
924 /* read always uses only one mirror - idx 0 for pgio layer */
925 pgm = &pgio->pg_mirrors[0];
926 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
927
928 return;
1c1aeaf1
TM		 929out_nolseg:
930 if (pgio->pg_error < 0)
931 return;
d67ae825
TH		 932out_mds:
933 pnfs_put_lseg(pgio->pg_lseg);
934 pgio->pg_lseg = NULL;
935 nfs_pageio_reset_read_mds(pgio);
936}
937
938static void
939ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
940 struct nfs_page *req)
941{
942 struct nfs4_ff_layout_mirror *mirror;
943 struct nfs_pgio_mirror *pgm;
944 struct nfs_commit_info cinfo;
945 struct nfs4_pnfs_ds *ds;
946 int i;
947 int status;
948
3dc14735 949retry:
b3230e80 950 pnfs_generic_pg_check_layout(pgio);
d600ad1f 951 if (!pgio->pg_lseg) {
d67ae825
TH		 952 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
953 req->wb_context,
954 0,
955 NFS4_MAX_UINT64,
956 IOMODE_RW,
c7d73af2 957 false,
d67ae825 958 GFP_NOFS);
d600ad1f
PT		 959 if (IS_ERR(pgio->pg_lseg)) {
960 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
961 pgio->pg_lseg = NULL;
962 return;
963 }
964 }
d67ae825
TH		 965 /* If no lseg, fall back to write through mds */
966 if (pgio->pg_lseg == NULL)
967 goto out_mds;
968
969 nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
970 status = ff_layout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
971 if (status < 0)
972 goto out_mds;
973
974 /* Use a direct mapping of ds_idx to pgio mirror_idx */
975 if (WARN_ON_ONCE(pgio->pg_mirror_count !=
976 FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)))
977 goto out_mds;
978
979 for (i = 0; i < pgio->pg_mirror_count; i++) {
2444ff27 980 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i);
2444ff27 981 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, true);
446ca219 982 if (!ds) {
3dc14735 983 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg))
446ca219 984 goto out_mds;
3dc14735
TM		 985 pnfs_put_lseg(pgio->pg_lseg);
986 pgio->pg_lseg = NULL;
987 /* Sleep for 1 second before retrying */
988 ssleep(1);
989 goto retry;
446ca219 990 }
d67ae825 991 pgm = &pgio->pg_mirrors[i];
d67ae825
TH		 992 pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].wsize;
993 }
994
995 return;
996
997out_mds:
998 pnfs_put_lseg(pgio->pg_lseg);
999 pgio->pg_lseg = NULL;
1000 nfs_pageio_reset_write_mds(pgio);
1001}
1002
1003static unsigned int
1004ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio,
1005 struct nfs_page *req)
1006{
d600ad1f 1007 if (!pgio->pg_lseg) {
d67ae825
TH		 1008 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1009 req->wb_context,
1010 0,
1011 NFS4_MAX_UINT64,
1012 IOMODE_RW,
c7d73af2 1013 false,
d67ae825 1014 GFP_NOFS);
d600ad1f
PT		 1015 if (IS_ERR(pgio->pg_lseg)) {
1016 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1017 pgio->pg_lseg = NULL;
1018 goto out;
1019 }
1020 }
d67ae825
TH		 1021 if (pgio->pg_lseg)
1022 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
1023
1024 /* no lseg means that pnfs is not in use, so no mirroring here */
d67ae825 1025 nfs_pageio_reset_write_mds(pgio);
d600ad1f 1026out:
d67ae825
TH		 1027 return 1;
1028}
1029
1030static const struct nfs_pageio_ops ff_layout_pg_read_ops = {
1031 .pg_init = ff_layout_pg_init_read,
1032 .pg_test = pnfs_generic_pg_test,
1033 .pg_doio = pnfs_generic_pg_readpages,
1034 .pg_cleanup = pnfs_generic_pg_cleanup,
1035};
1036
1037static const struct nfs_pageio_ops ff_layout_pg_write_ops = {
1038 .pg_init = ff_layout_pg_init_write,
1039 .pg_test = pnfs_generic_pg_test,
1040 .pg_doio = pnfs_generic_pg_writepages,
1041 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write,
1042 .pg_cleanup = pnfs_generic_pg_cleanup,
1043};
1044
1045static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs)
1046{
1047 struct rpc_task *task = &hdr->task;
1048
1049 pnfs_layoutcommit_inode(hdr->inode, false);
1050
1051 if (retry_pnfs) {
1052 dprintk("%s Reset task %5u for i/o through pNFS "
1053 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1054 hdr->task.tk_pid,
1055 hdr->inode->i_sb->s_id,
1056 (unsigned long long)NFS_FILEID(hdr->inode),
1057 hdr->args.count,
1058 (unsigned long long)hdr->args.offset);
1059
dc602dd7 1060 hdr->completion_ops->reschedule_io(hdr);
d67ae825
TH		 1061 return;
1062 }
1063
1064 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1065 dprintk("%s Reset task %5u for i/o through MDS "
1066 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1067 hdr->task.tk_pid,
1068 hdr->inode->i_sb->s_id,
1069 (unsigned long long)NFS_FILEID(hdr->inode),
1070 hdr->args.count,
1071 (unsigned long long)hdr->args.offset);
1072
1073 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
1074 }
1075}
1076
1077static void ff_layout_reset_read(struct nfs_pgio_header *hdr)
1078{
1079 struct rpc_task *task = &hdr->task;
1080
1081 pnfs_layoutcommit_inode(hdr->inode, false);
1082
1083 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1084 dprintk("%s Reset task %5u for i/o through MDS "
1085 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
1086 hdr->task.tk_pid,
1087 hdr->inode->i_sb->s_id,
1088 (unsigned long long)NFS_FILEID(hdr->inode),
1089 hdr->args.count,
1090 (unsigned long long)hdr->args.offset);
1091
1092 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
1093 }
1094}
1095
1096static int ff_layout_async_handle_error_v4(struct rpc_task *task,
1097 struct nfs4_state *state,
1098 struct nfs_client *clp,
1099 struct pnfs_layout_segment *lseg,
1100 int idx)
1101{
1102 struct pnfs_layout_hdr *lo = lseg->pls_layout;
1103 struct inode *inode = lo->plh_inode;
d67ae825 1104 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
d67ae825
TH		 1105 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
1106
d67ae825 1107 switch (task->tk_status) {
d67ae825
TH		 1108 case -NFS4ERR_BADSESSION:
1109 case -NFS4ERR_BADSLOT:
1110 case -NFS4ERR_BAD_HIGH_SLOT:
1111 case -NFS4ERR_DEADSESSION:
1112 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1113 case -NFS4ERR_SEQ_FALSE_RETRY:
1114 case -NFS4ERR_SEQ_MISORDERED:
1115 dprintk("%s ERROR %d, Reset session. Exchangeid "
1116 "flags 0x%x\n", __func__, task->tk_status,
1117 clp->cl_exchange_flags);
1118 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
1119 break;
1120 case -NFS4ERR_DELAY:
1121 case -NFS4ERR_GRACE:
1122 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX);
1123 break;
1124 case -NFS4ERR_RETRY_UNCACHED_REP:
1125 break;
a79f194a
TM		 1126 case -EAGAIN:
1127 return -NFS4ERR_RESET_TO_PNFS;
d67ae825
TH		 1128 /* Invalidate Layout errors */
1129 case -NFS4ERR_PNFS_NO_LAYOUT:
1130 case -ESTALE: /* mapped NFS4ERR_STALE */
1131 case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */
1132 case -EISDIR: /* mapped NFS4ERR_ISDIR */
1133 case -NFS4ERR_FHEXPIRED:
1134 case -NFS4ERR_WRONG_TYPE:
1135 dprintk("%s Invalid layout error %d\n", __func__,
1136 task->tk_status);
1137 /*
1138 * Destroy layout so new i/o will get a new layout.
1139 * Layout will not be destroyed until all current lseg
1140 * references are put. Mark layout as invalid to resend failed
1141 * i/o and all i/o waiting on the slot table to the MDS until
1142 * layout is destroyed and a new valid layout is obtained.
1143 */
1144 pnfs_destroy_layout(NFS_I(inode));
1145 rpc_wake_up(&tbl->slot_tbl_waitq);
1146 goto reset;
1147 /* RPC connection errors */
1148 case -ECONNREFUSED:
1149 case -EHOSTDOWN:
1150 case -EHOSTUNREACH:
1151 case -ENETUNREACH:
1152 case -EIO:
1153 case -ETIMEDOUT:
1154 case -EPIPE:
1155 dprintk("%s DS connection error %d\n", __func__,
1156 task->tk_status);
1c48cee8
WAA		 1157 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1158 &devid->deviceid);
d67ae825
TH		 1159 rpc_wake_up(&tbl->slot_tbl_waitq);
1160 /* fall through */
1161 default:
3b13b4b3 1162 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1163 return -NFS4ERR_RESET_TO_PNFS;
1164reset:
1165 dprintk("%s Retry through MDS. Error %d\n", __func__,
1166 task->tk_status);
1167 return -NFS4ERR_RESET_TO_MDS;
1168 }
d67ae825
TH		 1169 task->tk_status = 0;
1170 return -EAGAIN;
d67ae825
TH		 1171}
1172
1173/* Retry all errors through either pNFS or MDS except for -EJUKEBOX */
1174static int ff_layout_async_handle_error_v3(struct rpc_task *task,
1175 struct pnfs_layout_segment *lseg,
1176 int idx)
1177{
1178 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx);
1179
90816d1d
TM		 1180 switch (task->tk_status) {
1181 /* File access problems. Don't mark the device as unavailable */
1182 case -EACCES:
1183 case -ESTALE:
1184 case -EISDIR:
1185 case -EBADHANDLE:
1186 case -ELOOP:
1187 case -ENOSPC:
a79f194a 1188 case -EAGAIN:
90816d1d
TM		 1189 break;
1190 case -EJUKEBOX:
1191 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
1192 goto out_retry;
1193 default:
d67ae825
TH		 1194 dprintk("%s DS connection error %d\n", __func__,
1195 task->tk_status);
1c48cee8
WAA		 1196 nfs4_delete_deviceid(devid->ld, devid->nfs_client,
1197 &devid->deviceid);
d67ae825 1198 }
90816d1d
TM		 1199 /* FIXME: Need to prevent infinite looping here. */
1200 return -NFS4ERR_RESET_TO_PNFS;
1201out_retry:
d67ae825 1202 task->tk_status = 0;
7eeea167 1203 rpc_restart_call_prepare(task);
d67ae825
TH		 1204 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
1205 return -EAGAIN;
1206}
1207
1208static int ff_layout_async_handle_error(struct rpc_task *task,
1209 struct nfs4_state *state,
1210 struct nfs_client *clp,
1211 struct pnfs_layout_segment *lseg,
1212 int idx)
1213{
1214 int vers = clp->cl_nfs_mod->rpc_vers->number;
1215
76c66905
TM		 1216 if (task->tk_status >= 0) {
1217 ff_layout_mark_ds_reachable(lseg, idx);
df3ab232 1218 return 0;
76c66905 1219 }
df3ab232
TM		 1220
1221 /* Handle the case of an invalid layout segment */
1222 if (!pnfs_is_valid_lseg(lseg))
1223 return -NFS4ERR_RESET_TO_PNFS;
1224
d67ae825
TH		 1225 switch (vers) {
1226 case 3:
1227 return ff_layout_async_handle_error_v3(task, lseg, idx);
1228 case 4:
1229 return ff_layout_async_handle_error_v4(task, state, clp,
1230 lseg, idx);
1231 default:
1232 /* should never happen */
1233 WARN_ON_ONCE(1);
1234 return 0;
1235 }
1236}
1237
1238static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg,
1239 int idx, u64 offset, u64 length,
dd52128a 1240 u32 status, int opnum, int error)
d67ae825
TH		 1241{
1242 struct nfs4_ff_layout_mirror *mirror;
1243 int err;
1244
dd52128a
TM		 1245 if (status == 0) {
1246 switch (error) {
1247 case -ETIMEDOUT:
1248 case -EPFNOSUPPORT:
1249 case -EPROTONOSUPPORT:
1250 case -EOPNOTSUPP:
1251 case -ECONNREFUSED:
1252 case -ECONNRESET:
1253 case -EHOSTDOWN:
1254 case -EHOSTUNREACH:
1255 case -ENETUNREACH:
1256 case -EADDRINUSE:
1257 case -ENOBUFS:
1258 case -EPIPE:
1259 case -EPERM:
1260 status = NFS4ERR_NXIO;
1261 break;
1262 case -EACCES:
1263 status = NFS4ERR_ACCESS;
1264 break;
1265 default:
1266 return;
1267 }
1268 }
1269
c22eeb86
PT		 1270 switch (status) {
1271 case NFS4ERR_DELAY:
1272 case NFS4ERR_GRACE:
1273 return;
1274 default:
1275 break;
1276 }
1277
d67ae825
TH		 1278 mirror = FF_LAYOUT_COMP(lseg, idx);
1279 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
1280 mirror, offset, length, status, opnum,
1281 GFP_NOIO);
76c66905
TM		 1282 if (status == NFS4ERR_NXIO)
1283 ff_layout_mark_ds_unreachable(lseg, idx);
f95c03b2 1284 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
d67ae825
TH		 1285 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status);
1286}
1287
1288/* NFS_PROTO call done callback routines */
d67ae825
TH		 1289static int ff_layout_read_done_cb(struct rpc_task *task,
1290 struct nfs_pgio_header *hdr)
1291{
d67ae825
TH		 1292 int err;
1293
1294 trace_nfs4_pnfs_read(hdr, task->tk_status);
dd52128a 1295 if (task->tk_status < 0)
d67ae825
TH		 1296 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1297 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1298 hdr->res.op_status, OP_READ,
1299 task->tk_status);
d67ae825
TH		 1300 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1301 hdr->ds_clp, hdr->lseg,
1302 hdr->pgio_mirror_idx);
1303
42f86b44
TM		 1304 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1305 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1306 switch (err) {
1307 case -NFS4ERR_RESET_TO_PNFS:
13544412
TM		 1308 if (ff_layout_choose_best_ds_for_read(hdr->lseg,
1309 hdr->pgio_mirror_idx + 1,
1310 &hdr->pgio_mirror_idx))
f0922a6c 1311 goto out_layouterror;
42f86b44 1312 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
d67ae825
TH		 1313 return task->tk_status;
1314 case -NFS4ERR_RESET_TO_MDS:
42f86b44 1315 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1316 return task->tk_status;
1317 case -EAGAIN:
13544412 1318 goto out_eagain;
d67ae825
TH		 1319 }
1320
1321 return 0;
f0922a6c
TM		 1322out_layouterror:
1323 ff_layout_send_layouterror(hdr->lseg);
13544412
TM		 1324out_eagain:
1325 rpc_restart_call_prepare(task);
1326 return -EAGAIN;
d67ae825
TH		 1327}
1328
c0f5f505
TM		 1329static bool
1330ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg)
1331{
1332 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT);
1333}
1334
d67ae825
TH		 1335/*
1336 * We reference the rpc_cred of the first WRITE that triggers the need for
1337 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
1338 * rfc5661 is not clear about which credential should be used.
1339 *
1340 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so
1341 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751
1342 * we always send layoutcommit after DS writes.
1343 */
1344static void
bc28e1c2
TM		 1345ff_layout_set_layoutcommit(struct inode *inode,
1346 struct pnfs_layout_segment *lseg,
1347 loff_t end_offset)
d67ae825 1348{
bc28e1c2 1349 if (!ff_layout_need_layoutcommit(lseg))
c0f5f505
TM		 1350 return;
1351
bc28e1c2
TM		 1352 pnfs_set_layoutcommit(inode, lseg, end_offset);
1353 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino,
1354 (unsigned long long) NFS_I(inode)->layout->plh_lwb);
d67ae825
TH		 1355}
1356
37e9ed22
TM		 1357static void ff_layout_read_record_layoutstats_start(struct rpc_task *task,
1358 struct nfs_pgio_header *hdr)
d67ae825 1359{
37e9ed22
TM		 1360 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1361 return;
0b7baf94 1362 nfs4_ff_layout_stat_io_start_read(hdr->inode,
abcb7bfc 1363 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1364 hdr->args.count,
1365 task->tk_start);
37e9ed22
TM		 1366}
1367
1368static void ff_layout_read_record_layoutstats_done(struct rpc_task *task,
1369 struct nfs_pgio_header *hdr)
1370{
1371 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1372 return;
1373 nfs4_ff_layout_stat_io_end_read(task,
1374 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1375 hdr->args.count,
1376 hdr->res.count);
056f9ad6 1377 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1378}
abcb7bfc 1379
37e9ed22
TM		 1380static int ff_layout_read_prepare_common(struct rpc_task *task,
1381 struct nfs_pgio_header *hdr)
1382{
d67ae825
TH		 1383 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1384 rpc_exit(task, -EIO);
1385 return -EIO;
1386 }
d67ae825 1387
37e9ed22 1388 ff_layout_read_record_layoutstats_start(task, hdr);
d67ae825
TH		 1389 return 0;
1390}
1391
1392/*
1393 * Call ops for the async read/write cases
1394 * In the case of dense layouts, the offset needs to be reset to its
1395 * original value.
1396 */
1397static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data)
1398{
1399 struct nfs_pgio_header *hdr = data;
1400
1401 if (ff_layout_read_prepare_common(task, hdr))
1402 return;
1403
1404 rpc_call_start(task);
1405}
1406
d67ae825
TH		 1407static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
1408{
1409 struct nfs_pgio_header *hdr = data;
1410
6de7e12f
AS		 1411 if (nfs4_setup_sequence(hdr->ds_clp,
1412 &hdr->args.seq_args,
1413 &hdr->res.seq_res,
1414 task))
d67ae825
TH		 1415 return;
1416
bb21ce0a 1417 ff_layout_read_prepare_common(task, hdr);
d67ae825
TH		 1418}
1419
a79f194a
TM		 1420static void
1421ff_layout_io_prepare_transmit(struct rpc_task *task,
1422 void *data)
1423{
1424 struct nfs_pgio_header *hdr = data;
1425
1426 if (!pnfs_is_valid_lseg(hdr->lseg))
1427 rpc_exit(task, -EAGAIN);
1428}
1429
d67ae825
TH		 1430static void ff_layout_read_call_done(struct rpc_task *task, void *data)
1431{
1432 struct nfs_pgio_header *hdr = data;
1433
1434 dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
1435
1436 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1437 task->tk_status == 0) {
1438 nfs4_sequence_done(task, &hdr->res.seq_res);
1439 return;
1440 }
1441
1442 /* Note this may cause RPC to be resent */
1443 hdr->mds_ops->rpc_call_done(task, hdr);
1444}
1445
1446static void ff_layout_read_count_stats(struct rpc_task *task, void *data)
1447{
1448 struct nfs_pgio_header *hdr = data;
1449
37e9ed22 1450 ff_layout_read_record_layoutstats_done(task, hdr);
d67ae825
TH		 1451 rpc_count_iostats_metrics(task,
1452 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]);
1453}
1454
4d0ac221
TM		 1455static void ff_layout_read_release(void *data)
1456{
1457 struct nfs_pgio_header *hdr = data;
1458
1459 ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
f0922a6c
TM		 1460 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1461 ff_layout_send_layouterror(hdr->lseg);
42f86b44 1462 pnfs_read_resend_pnfs(hdr);
f0922a6c 1463 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
42f86b44 1464 ff_layout_reset_read(hdr);
4d0ac221
TM		 1465 pnfs_generic_rw_release(data);
1466}
1467
1468
d67ae825
TH		 1469static int ff_layout_write_done_cb(struct rpc_task *task,
1470 struct nfs_pgio_header *hdr)
1471{
2e18d4d8 1472 loff_t end_offs = 0;
d67ae825
TH		 1473 int err;
1474
1475 trace_nfs4_pnfs_write(hdr, task->tk_status);
dd52128a 1476 if (task->tk_status < 0)
d67ae825
TH		 1477 ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
1478 hdr->args.offset, hdr->args.count,
dd52128a
TM		 1479 hdr->res.op_status, OP_WRITE,
1480 task->tk_status);
d67ae825
TH		 1481 err = ff_layout_async_handle_error(task, hdr->args.context->state,
1482 hdr->ds_clp, hdr->lseg,
1483 hdr->pgio_mirror_idx);
1484
7b0df92a
TM		 1485 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
1486 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1487 switch (err) {
1488 case -NFS4ERR_RESET_TO_PNFS:
7b0df92a 1489 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
7cc8c5cd 1490 return task->tk_status;
d67ae825 1491 case -NFS4ERR_RESET_TO_MDS:
7b0df92a 1492 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
d67ae825
TH		 1493 return task->tk_status;
1494 case -EAGAIN:
d67ae825
TH		 1495 return -EAGAIN;
1496 }
1497
1498 if (hdr->res.verf->committed == NFS_FILE_SYNC ||
1499 hdr->res.verf->committed == NFS_DATA_SYNC)
2e18d4d8
TM		 1500 end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
1501
1502 /* Note: if the write is unstable, don't set end_offs until commit */
1503 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
d67ae825 1504
54204010
PT		 1505 /* zero out fattr since we don't care DS attr at all */
1506 hdr->fattr.valid = 0;
69f230d9
PT		 1507 if (task->tk_status >= 0)
1508 nfs_writeback_update_inode(hdr);
1509
d67ae825
TH		 1510 return 0;
1511}
1512
1513static int ff_layout_commit_done_cb(struct rpc_task *task,
1514 struct nfs_commit_data *data)
1515{
d67ae825
TH		 1516 int err;
1517
1518 trace_nfs4_pnfs_commit_ds(data, task->tk_status);
dd52128a 1519 if (task->tk_status < 0)
d67ae825
TH		 1520 ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
1521 data->args.offset, data->args.count,
dd52128a
TM		 1522 data->res.op_status, OP_COMMIT,
1523 task->tk_status);
d67ae825
TH		 1524 err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
1525 data->lseg, data->ds_commit_index);
1526
1527 switch (err) {
1528 case -NFS4ERR_RESET_TO_PNFS:
7cc8c5cd
TM		 1529 pnfs_generic_prepare_to_resend_writes(data);
1530 return -EAGAIN;
d67ae825 1531 case -NFS4ERR_RESET_TO_MDS:
d67ae825
TH		 1532 pnfs_generic_prepare_to_resend_writes(data);
1533 return -EAGAIN;
1534 case -EAGAIN:
1535 rpc_restart_call_prepare(task);
1536 return -EAGAIN;
1537 }
1538
bc28e1c2 1539 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb);
d67ae825
TH		 1540
1541 return 0;
1542}
1543
37e9ed22
TM		 1544static void ff_layout_write_record_layoutstats_start(struct rpc_task *task,
1545 struct nfs_pgio_header *hdr)
d67ae825 1546{
37e9ed22
TM		 1547 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags))
1548 return;
0b7baf94 1549 nfs4_ff_layout_stat_io_start_write(hdr->inode,
abcb7bfc 1550 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
e76d28dd
TM		 1551 hdr->args.count,
1552 task->tk_start);
37e9ed22
TM		 1553}
1554
1555static void ff_layout_write_record_layoutstats_done(struct rpc_task *task,
1556 struct nfs_pgio_header *hdr)
1557{
1558 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags))
1559 return;
1560 nfs4_ff_layout_stat_io_end_write(task,
1561 FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx),
1562 hdr->args.count, hdr->res.count,
1563 hdr->res.verf->committed);
056f9ad6 1564 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags);
37e9ed22 1565}
abcb7bfc 1566
37e9ed22
TM		 1567static int ff_layout_write_prepare_common(struct rpc_task *task,
1568 struct nfs_pgio_header *hdr)
1569{
d67ae825
TH		 1570 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
1571 rpc_exit(task, -EIO);
1572 return -EIO;
1573 }
1574
37e9ed22 1575 ff_layout_write_record_layoutstats_start(task, hdr);
d67ae825
TH		 1576 return 0;
1577}
1578
1579static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data)
1580{
1581 struct nfs_pgio_header *hdr = data;
1582
1583 if (ff_layout_write_prepare_common(task, hdr))
1584 return;
1585
1586 rpc_call_start(task);
1587}
1588
1589static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data)
1590{
1591 struct nfs_pgio_header *hdr = data;
1592
6de7e12f
AS		 1593 if (nfs4_setup_sequence(hdr->ds_clp,
1594 &hdr->args.seq_args,
1595 &hdr->res.seq_res,
1596 task))
d67ae825
TH		 1597 return;
1598
bb21ce0a 1599 ff_layout_write_prepare_common(task, hdr);
d67ae825
TH		 1600}
1601
1602static void ff_layout_write_call_done(struct rpc_task *task, void *data)
1603{
1604 struct nfs_pgio_header *hdr = data;
1605
1606 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
1607 task->tk_status == 0) {
1608 nfs4_sequence_done(task, &hdr->res.seq_res);
1609 return;
1610 }
1611
1612 /* Note this may cause RPC to be resent */
1613 hdr->mds_ops->rpc_call_done(task, hdr);
1614}
1615
1616static void ff_layout_write_count_stats(struct rpc_task *task, void *data)
1617{
1618 struct nfs_pgio_header *hdr = data;
1619
37e9ed22 1620 ff_layout_write_record_layoutstats_done(task, hdr);
d67ae825
TH		 1621 rpc_count_iostats_metrics(task,
1622 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]);
1623}
1624
4d0ac221
TM		 1625static void ff_layout_write_release(void *data)
1626{
1627 struct nfs_pgio_header *hdr = data;
1628
1629 ff_layout_write_record_layoutstats_done(&hdr->task, hdr);
f0922a6c
TM		 1630 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) {
1631 ff_layout_send_layouterror(hdr->lseg);
7b0df92a 1632 ff_layout_reset_write(hdr, true);
f0922a6c 1633 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
7b0df92a 1634 ff_layout_reset_write(hdr, false);
4d0ac221
TM		 1635 pnfs_generic_rw_release(data);
1636}
1637
37e9ed22 1638static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task,
abcb7bfc
TM		 1639 struct nfs_commit_data *cdata)
1640{
37e9ed22
TM		 1641 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags))
1642 return;
0b7baf94 1643 nfs4_ff_layout_stat_io_start_write(cdata->inode,
abcb7bfc 1644 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
e76d28dd 1645 0, task->tk_start);
abcb7bfc
TM		 1646}
1647
37e9ed22
TM		 1648static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task,
1649 struct nfs_commit_data *cdata)
1650{
1651 struct nfs_page *req;
1652 __u64 count = 0;
1653
1654 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags))
1655 return;
1656
1657 if (task->tk_status == 0) {
1658 list_for_each_entry(req, &cdata->pages, wb_list)
1659 count += req->wb_bytes;
1660 }
1661 nfs4_ff_layout_stat_io_end_write(task,
1662 FF_LAYOUT_COMP(cdata->lseg, cdata->ds_commit_index),
1663 count, count, NFS_FILE_SYNC);
056f9ad6 1664 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags);
37e9ed22
TM		 1665}
1666
1667static void ff_layout_commit_prepare_common(struct rpc_task *task,
1668 struct nfs_commit_data *cdata)
1669{
1670 ff_layout_commit_record_layoutstats_start(task, cdata);
1671}
1672
d67ae825
TH		 1673static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data)
1674{
abcb7bfc 1675 ff_layout_commit_prepare_common(task, data);
d67ae825
TH		 1676 rpc_call_start(task);
1677}
1678
1679static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data)
1680{
1681 struct nfs_commit_data *wdata = data;
1682
6de7e12f
AS		 1683 if (nfs4_setup_sequence(wdata->ds_clp,
1684 &wdata->args.seq_args,
1685 &wdata->res.seq_res,
1686 task))
abcb7bfc
TM		 1687 return;
1688 ff_layout_commit_prepare_common(task, data);
1689}
1690
1691static void ff_layout_commit_done(struct rpc_task *task, void *data)
141b9b59
PT		 1692{
1693 pnfs_generic_write_commit_done(task, data);
1694}
1695
1696static void ff_layout_commit_count_stats(struct rpc_task *task, void *data)
abcb7bfc
TM		 1697{
1698 struct nfs_commit_data *cdata = data;
abcb7bfc 1699
37e9ed22 1700 ff_layout_commit_record_layoutstats_done(task, cdata);
d67ae825
TH		 1701 rpc_count_iostats_metrics(task,
1702 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]);
1703}
1704
4d0ac221
TM		 1705static void ff_layout_commit_release(void *data)
1706{
1707 struct nfs_commit_data *cdata = data;
1708
1709 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata);
1710 pnfs_generic_commit_release(data);
1711}
1712
d67ae825
TH		 1713static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
1714 .rpc_call_prepare = ff_layout_read_prepare_v3,
a79f194a 1715 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
d67ae825
TH		 1716 .rpc_call_done = ff_layout_read_call_done,
1717 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1718 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1719};
1720
1721static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
1722 .rpc_call_prepare = ff_layout_read_prepare_v4,
a79f194a 1723 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
d67ae825
TH		 1724 .rpc_call_done = ff_layout_read_call_done,
1725 .rpc_count_stats = ff_layout_read_count_stats,
4d0ac221 1726 .rpc_release = ff_layout_read_release,
d67ae825
TH		 1727};
1728
1729static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
1730 .rpc_call_prepare = ff_layout_write_prepare_v3,
a79f194a 1731 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
d67ae825
TH		 1732 .rpc_call_done = ff_layout_write_call_done,
1733 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1734 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1735};
1736
1737static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
1738 .rpc_call_prepare = ff_layout_write_prepare_v4,
a79f194a 1739 .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
d67ae825
TH		 1740 .rpc_call_done = ff_layout_write_call_done,
1741 .rpc_count_stats = ff_layout_write_count_stats,
4d0ac221 1742 .rpc_release = ff_layout_write_release,
d67ae825
TH		 1743};
1744
1745static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = {
1746 .rpc_call_prepare = ff_layout_commit_prepare_v3,
abcb7bfc 1747 .rpc_call_done = ff_layout_commit_done,
d67ae825 1748 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1749 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1750};
1751
1752static const struct rpc_call_ops ff_layout_commit_call_ops_v4 = {
1753 .rpc_call_prepare = ff_layout_commit_prepare_v4,
abcb7bfc 1754 .rpc_call_done = ff_layout_commit_done,
d67ae825 1755 .rpc_count_stats = ff_layout_commit_count_stats,
4d0ac221 1756 .rpc_release = ff_layout_commit_release,
d67ae825
TH		 1757};
1758
1759static enum pnfs_try_status
1760ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
1761{
1762 struct pnfs_layout_segment *lseg = hdr->lseg;
1763 struct nfs4_pnfs_ds *ds;
1764 struct rpc_clnt *ds_clnt;
2444ff27 1765 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1766 const struct cred *ds_cred;
d67ae825
TH		 1767 loff_t offset = hdr->args.offset;
1768 u32 idx = hdr->pgio_mirror_idx;
1769 int vers;
1770 struct nfs_fh *fh;
1771
5b5e0928 1772 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n",
d67ae825
TH		 1773 __func__, hdr->inode->i_ino,
1774 hdr->args.pgbase, (size_t)hdr->args.count, offset);
1775
2444ff27
TM		 1776 mirror = FF_LAYOUT_COMP(lseg, idx);
1777 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, false);
d67ae825
TH		 1778 if (!ds)
1779 goto out_failed;
1780
1781 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1782 hdr->inode);
1783 if (IS_ERR(ds_clnt))
1784 goto out_failed;
1785
1786 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1787 if (!ds_cred)
d67ae825
TH		 1788 goto out_failed;
1789
1790 vers = nfs4_ff_layout_ds_version(lseg, idx);
1791
1792 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__,
212bf41d 1793 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers);
d67ae825 1794
75bf47eb 1795 hdr->pgio_done_cb = ff_layout_read_done_cb;
212bf41d 1796 refcount_inc(&ds->ds_clp->cl_count);
d67ae825 1797 hdr->ds_clp = ds->ds_clp;
749da527 1798 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1799 if (fh)
1800 hdr->args.fh = fh;
bb21ce0a 1801
320f35b7
TM		 1802 if (vers == 4 &&
1803 !nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
bb21ce0a
TM		 1804 goto out_failed;
1805
d67ae825
TH		 1806 /*
1807 * Note that if we ever decide to split across DSes,
1808 * then we may need to handle dense-like offsets.
1809 */
1810 hdr->args.offset = offset;
1811 hdr->mds_offset = offset;
1812
1813 /* Perform an asynchronous read to ds */
1814 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1815 vers == 3 ? &ff_layout_read_call_ops_v3 :
1816 &ff_layout_read_call_ops_v4,
1817 0, RPC_TASK_SOFTCONN);
a52458b4 1818 put_cred(ds_cred);
d67ae825
TH		 1819 return PNFS_ATTEMPTED;
1820
1821out_failed:
3b13b4b3 1822 if (ff_layout_avoid_mds_available_ds(lseg))
d67ae825
TH		 1823 return PNFS_TRY_AGAIN;
1824 return PNFS_NOT_ATTEMPTED;
1825}
1826
1827/* Perform async writes. */
1828static enum pnfs_try_status
1829ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
1830{
1831 struct pnfs_layout_segment *lseg = hdr->lseg;
1832 struct nfs4_pnfs_ds *ds;
1833 struct rpc_clnt *ds_clnt;
2444ff27 1834 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1835 const struct cred *ds_cred;
d67ae825
TH		 1836 loff_t offset = hdr->args.offset;
1837 int vers;
1838 struct nfs_fh *fh;
1839 int idx = hdr->pgio_mirror_idx;
1840
2444ff27
TM		 1841 mirror = FF_LAYOUT_COMP(lseg, idx);
1842 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825 1843 if (!ds)
37f8aa16 1844 goto out_failed;
d67ae825
TH		 1845
1846 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1847 hdr->inode);
1848 if (IS_ERR(ds_clnt))
37f8aa16 1849 goto out_failed;
d67ae825
TH		 1850
1851 ds_cred = ff_layout_get_ds_cred(lseg, idx, hdr->cred);
57f3f4c0 1852 if (!ds_cred)
37f8aa16 1853 goto out_failed;
d67ae825
TH		 1854
1855 vers = nfs4_ff_layout_ds_version(lseg, idx);
1856
5b5e0928 1857 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n",
d67ae825 1858 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
212bf41d 1859 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1860 vers);
1861
1862 hdr->pgio_done_cb = ff_layout_write_done_cb;
212bf41d 1863 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1864 hdr->ds_clp = ds->ds_clp;
1865 hdr->ds_commit_idx = idx;
749da527 1866 fh = nfs4_ff_layout_select_ds_fh(mirror);
d67ae825
TH		 1867 if (fh)
1868 hdr->args.fh = fh;
1869
320f35b7
TM		 1870 if (vers == 4 &&
1871 !nfs4_ff_layout_select_ds_stateid(lseg, idx, &hdr->args.stateid))
bb21ce0a
TM		 1872 goto out_failed;
1873
d67ae825
TH		 1874 /*
1875 * Note that if we ever decide to split across DSes,
1876 * then we may need to handle dense-like offsets.
1877 */
1878 hdr->args.offset = offset;
1879
1880 /* Perform an asynchronous write */
1881 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops,
1882 vers == 3 ? &ff_layout_write_call_ops_v3 :
1883 &ff_layout_write_call_ops_v4,
1884 sync, RPC_TASK_SOFTCONN);
a52458b4 1885 put_cred(ds_cred);
d67ae825 1886 return PNFS_ATTEMPTED;
37f8aa16
TM		 1887
1888out_failed:
1889 if (ff_layout_avoid_mds_available_ds(lseg))
1890 return PNFS_TRY_AGAIN;
1891 return PNFS_NOT_ATTEMPTED;
d67ae825
TH		 1892}
1893
d67ae825
TH		 1894static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1895{
1896 return i;
1897}
1898
1899static struct nfs_fh *
1900select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1901{
1902 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg);
1903
1904 /* FIXME: Assume that there is only one NFS version available
1905 * for the DS.
1906 */
1907 return &flseg->mirror_array[i]->fh_versions[0];
1908}
1909
1910static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
1911{
1912 struct pnfs_layout_segment *lseg = data->lseg;
1913 struct nfs4_pnfs_ds *ds;
1914 struct rpc_clnt *ds_clnt;
2444ff27 1915 struct nfs4_ff_layout_mirror *mirror;
a52458b4 1916 const struct cred *ds_cred;
d67ae825 1917 u32 idx;
57f3f4c0 1918 int vers, ret;
d67ae825
TH		 1919 struct nfs_fh *fh;
1920
4b75053e
TM		 1921 if (!lseg || !(pnfs_is_valid_lseg(lseg) ||
1922 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)))
1923 goto out_err;
1924
d67ae825 1925 idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
2444ff27
TM		 1926 mirror = FF_LAYOUT_COMP(lseg, idx);
1927 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, true);
d67ae825
TH		 1928 if (!ds)
1929 goto out_err;
1930
1931 ds_clnt = nfs4_ff_find_or_create_ds_client(lseg, idx, ds->ds_clp,
1932 data->inode);
1933 if (IS_ERR(ds_clnt))
1934 goto out_err;
1935
1936 ds_cred = ff_layout_get_ds_cred(lseg, idx, data->cred);
57f3f4c0 1937 if (!ds_cred)
d67ae825
TH		 1938 goto out_err;
1939
1940 vers = nfs4_ff_layout_ds_version(lseg, idx);
1941
1942 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__,
212bf41d 1943 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count),
d67ae825
TH		 1944 vers);
1945 data->commit_done_cb = ff_layout_commit_done_cb;
1946 data->cred = ds_cred;
212bf41d 1947 refcount_inc(&ds->ds_clp->cl_count);
d67ae825
TH		 1948 data->ds_clp = ds->ds_clp;
1949 fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1950 if (fh)
1951 data->args.fh = fh;
abcb7bfc 1952
57f3f4c0 1953 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops,
d67ae825
TH		 1954 vers == 3 ? &ff_layout_commit_call_ops_v3 :
1955 &ff_layout_commit_call_ops_v4,
1956 how, RPC_TASK_SOFTCONN);
a52458b4 1957 put_cred(ds_cred);
57f3f4c0 1958 return ret;
d67ae825
TH		 1959out_err:
1960 pnfs_generic_prepare_to_resend_writes(data);
1961 pnfs_generic_commit_release(data);
1962 return -EAGAIN;
1963}
1964
1965static int
1966ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1967 int how, struct nfs_commit_info *cinfo)
1968{
1969 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1970 ff_layout_initiate_commit);
1971}
1972
1973static struct pnfs_ds_commit_info *
1974ff_layout_get_ds_info(struct inode *inode)
1975{
1976 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1977
1978 if (layout == NULL)
1979 return NULL;
1980
1981 return &FF_LAYOUT_FROM_HDR(layout)->commit_info;
1982}
1983
1984static void
fc87701b 1985ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d)
d67ae825
TH		 1986{
1987 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds,
1988 id_node));
1989}
1990
5ba6a09e 1991static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
5b9b3c85
TM		 1992 const struct nfs4_layoutreturn_args *args,
1993 const struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825 1994{
d67ae825 1995 __be32 *start;
d67ae825
TH		 1996
1997 start = xdr_reserve_space(xdr, 4);
1998 if (unlikely(!start))
1999 return -E2BIG;
2000
5b9b3c85 2001 *start = cpu_to_be32(ff_args->num_errors);
d67ae825 2002 /* This assume we always return _ALL_ layouts */
5b9b3c85 2003 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
d67ae825
TH		 2004}
2005
230bc962
TM		 2006static void
2007encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
2008{
ab6e9aaf 2009 WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
230bc962
TM		 2010}
2011
2012static void
2013ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
2014 const nfs4_stateid *stateid,
2015 const struct nfs42_layoutstat_devinfo *devinfo)
2016{
2017 __be32 *p;
2018
2019 p = xdr_reserve_space(xdr, 8 + 8);
2020 p = xdr_encode_hyper(p, devinfo->offset);
2021 p = xdr_encode_hyper(p, devinfo->length);
2022 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
2023 p = xdr_reserve_space(xdr, 4*8);
2024 p = xdr_encode_hyper(p, devinfo->read_count);
2025 p = xdr_encode_hyper(p, devinfo->read_bytes);
2026 p = xdr_encode_hyper(p, devinfo->write_count);
2027 p = xdr_encode_hyper(p, devinfo->write_bytes);
2028 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE);
2029}
2030
2031static void
2032ff_layout_encode_ff_iostat(struct xdr_stream *xdr,
2033 const nfs4_stateid *stateid,
2034 const struct nfs42_layoutstat_devinfo *devinfo)
2035{
2036 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo);
2037 ff_layout_encode_ff_layoutupdate(xdr, devinfo,
2038 devinfo->ld_private.data);
2039}
2040
d67ae825 2041/* report nothing for now */
230bc962
TM		 2042static void ff_layout_encode_iostats_array(struct xdr_stream *xdr,
2043 const struct nfs4_layoutreturn_args *args,
2044 struct nfs4_flexfile_layoutreturn_args *ff_args)
d67ae825
TH		 2045{
2046 __be32 *p;
230bc962 2047 int i;
d67ae825
TH		 2048
2049 p = xdr_reserve_space(xdr, 4);
230bc962
TM		 2050 *p = cpu_to_be32(ff_args->num_dev);
2051 for (i = 0; i < ff_args->num_dev; i++)
2052 ff_layout_encode_ff_iostat(xdr,
2053 &args->layout->plh_stateid,
2054 &ff_args->devinfo[i]);
2055}
2056
2057static void
2058ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo,
2059 unsigned int num_entries)
2060{
2061 unsigned int i;
2062
2063 for (i = 0; i < num_entries; i++) {
2064 if (!devinfo[i].ld_private.ops)
2065 continue;
2066 if (!devinfo[i].ld_private.ops->free)
2067 continue;
2068 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
2069 }
d67ae825
TH		 2070}
2071
2072static struct nfs4_deviceid_node *
2073ff_layout_alloc_deviceid_node(struct nfs_server *server,
2074 struct pnfs_device *pdev, gfp_t gfp_flags)
2075{
2076 struct nfs4_ff_layout_ds *dsaddr;
2077
2078 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags);
2079 if (!dsaddr)
2080 return NULL;
2081 return &dsaddr->id_node;
2082}
2083
2084static void
94e5c571 2085ff_layout_encode_layoutreturn(struct xdr_stream *xdr,
5b9b3c85
TM		 2086 const void *voidargs,
2087 const struct nfs4_xdr_opaque_data *ff_opaque)
d67ae825 2088{
5b9b3c85 2089 const struct nfs4_layoutreturn_args *args = voidargs;
5ba6a09e 2090 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data;
d9152114
TM		 2091 struct xdr_buf tmp_buf = {
2092 .head = {
2093 [0] = {
2094 .iov_base = page_address(ff_args->pages[0]),
2095 },
2096 },
2097 .buflen = PAGE_SIZE,
2098 };
2099 struct xdr_stream tmp_xdr;
d67ae825
TH		 2100 __be32 *start;
2101
2102 dprintk("%s: Begin\n", __func__);
d67ae825 2103
0ccc61b1 2104 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL);
d9152114
TM		 2105
2106 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args);
2107 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args);
2108
2109 start = xdr_reserve_space(xdr, 4);
2110 *start = cpu_to_be32(tmp_buf.len);
2111 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len);
082fa37d 2112
d67ae825
TH		 2113 dprintk("%s: Return\n", __func__);
2114}
2115
5b9b3c85
TM		 2116static void
2117ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args)
2118{
2119 struct nfs4_flexfile_layoutreturn_args *ff_args;
2120
2121 if (!args->data)
2122 return;
2123 ff_args = args->data;
2124 args->data = NULL;
2125
2126 ff_layout_free_ds_ioerr(&ff_args->errors);
230bc962 2127 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev);
5b9b3c85 2128
d9152114 2129 put_page(ff_args->pages[0]);
5b9b3c85
TM		 2130 kfree(ff_args);
2131}
2132
2e54b9b1 2133static const struct nfs4_xdr_opaque_ops layoutreturn_ops = {
5b9b3c85
TM		 2134 .encode = ff_layout_encode_layoutreturn,
2135 .free = ff_layout_free_layoutreturn,
2136};
2137
2138static int
2139ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args)
2140{
2141 struct nfs4_flexfile_layoutreturn_args *ff_args;
230bc962 2142 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout);
5b9b3c85
TM		 2143
2144 ff_args = kmalloc(sizeof(*ff_args), GFP_KERNEL);
2145 if (!ff_args)
d9152114
TM		 2146 goto out_nomem;
2147 ff_args->pages[0] = alloc_page(GFP_KERNEL);
2148 if (!ff_args->pages[0])
2149 goto out_nomem_free;
5b9b3c85
TM		 2150
2151 INIT_LIST_HEAD(&ff_args->errors);
2152 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout,
2153 &args->range, &ff_args->errors,
2154 FF_LAYOUTRETURN_MAXERR);
2155
230bc962
TM		 2156 spin_lock(&args->inode->i_lock);
2157 ff_args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2158 &ff_args->devinfo[0], ARRAY_SIZE(ff_args->devinfo));
2159 spin_unlock(&args->inode->i_lock);
2160
5b9b3c85
TM		 2161 args->ld_private->ops = &layoutreturn_ops;
2162 args->ld_private->data = ff_args;
2163 return 0;
d9152114
TM		 2164out_nomem_free:
2165 kfree(ff_args);
2166out_nomem:
2167 return -ENOMEM;
5b9b3c85
TM		 2168}
2169
f0922a6c
TM		 2170#ifdef CONFIG_NFS_V4_2
2171void
2172ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2173{
2174 struct pnfs_layout_hdr *lo = lseg->pls_layout;
2175 struct nfs42_layout_error *errors;
2176 LIST_HEAD(head);
2177
2178 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR))
2179 return;
2180 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1);
2181 if (list_empty(&head))
2182 return;
2183
2184 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX,
2185 sizeof(*errors), GFP_NOFS);
2186 if (errors != NULL) {
2187 const struct nfs4_ff_layout_ds_err *pos;
2188 size_t n = 0;
2189
2190 list_for_each_entry(pos, &head, list) {
2191 errors[n].offset = pos->offset;
2192 errors[n].length = pos->length;
2193 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid);
2194 errors[n].errors[0].dev_id = pos->deviceid;
2195 errors[n].errors[0].status = pos->status;
2196 errors[n].errors[0].opnum = pos->opnum;
2197 n++;
2198 if (!list_is_last(&pos->list, &head) &&
2199 n < NFS42_LAYOUTERROR_MAX)
2200 continue;
2201 if (nfs42_proc_layouterror(lseg, errors, n) < 0)
2202 break;
2203 n = 0;
2204 }
2205 kfree(errors);
2206 }
2207 ff_layout_free_ds_ioerr(&head);
2208}
2209#else
2210void
2211ff_layout_send_layouterror(struct pnfs_layout_segment *lseg)
2212{
2213}
2214#endif
2215
27c43064
PT		 2216static int
2217ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen)
2218{
2219 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
2220
2221 return snprintf(buf, buflen, "%pI4", &sin->sin_addr);
2222}
2223
2224static size_t
2225ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf,
2226 const int buflen)
2227{
2228 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
2229 const struct in6_addr *addr = &sin6->sin6_addr;
2230
2231 /*
2232 * RFC 4291, Section 2.2.2
2233 *
2234 * Shorthanded ANY address
2235 */
2236 if (ipv6_addr_any(addr))
2237 return snprintf(buf, buflen, "::");
2238
2239 /*
2240 * RFC 4291, Section 2.2.2
2241 *
2242 * Shorthanded loopback address
2243 */
2244 if (ipv6_addr_loopback(addr))
2245 return snprintf(buf, buflen, "::1");
2246
2247 /*
2248 * RFC 4291, Section 2.2.3
2249 *
2250 * Special presentation address format for mapped v4
2251 * addresses.
2252 */
2253 if (ipv6_addr_v4mapped(addr))
2254 return snprintf(buf, buflen, "::ffff:%pI4",
2255 &addr->s6_addr32[3]);
2256
2257 /*
2258 * RFC 4291, Section 2.2.1
2259 */
2260 return snprintf(buf, buflen, "%pI6c", addr);
2261}
2262
2263/* Derived from rpc_sockaddr2uaddr */
2264static void
2265ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da)
2266{
2267 struct sockaddr *sap = (struct sockaddr *)&da->da_addr;
2268 char portbuf[RPCBIND_MAXUADDRPLEN];
2269 char addrbuf[RPCBIND_MAXUADDRLEN];
2270 char *netid;
2271 unsigned short port;
2272 int len, netid_len;
2273 __be32 *p;
2274
2275 switch (sap->sa_family) {
2276 case AF_INET:
2277 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0)
2278 return;
2279 port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2280 netid = "tcp";
2281 netid_len = 3;
2282 break;
2283 case AF_INET6:
2284 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0)
2285 return;
2286 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
2287 netid = "tcp6";
2288 netid_len = 4;
2289 break;
2290 default:
2291 /* we only support tcp and tcp6 */
2292 WARN_ON_ONCE(1);
2293 return;
2294 }
2295
2296 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff);
2297 len = strlcat(addrbuf, portbuf, sizeof(addrbuf));
2298
2299 p = xdr_reserve_space(xdr, 4 + netid_len);
2300 xdr_encode_opaque(p, netid, netid_len);
2301
2302 p = xdr_reserve_space(xdr, 4 + len);
2303 xdr_encode_opaque(p, addrbuf, len);
2304}
2305
2306static void
2307ff_layout_encode_nfstime(struct xdr_stream *xdr,
2308 ktime_t t)
2309{
2310 struct timespec64 ts;
2311 __be32 *p;
2312
2313 p = xdr_reserve_space(xdr, 12);
2314 ts = ktime_to_timespec64(t);
2315 p = xdr_encode_hyper(p, ts.tv_sec);
2316 *p++ = cpu_to_be32(ts.tv_nsec);
2317}
2318
2319static void
2320ff_layout_encode_io_latency(struct xdr_stream *xdr,
2321 struct nfs4_ff_io_stat *stat)
2322{
2323 __be32 *p;
2324
2325 p = xdr_reserve_space(xdr, 5 * 8);
2326 p = xdr_encode_hyper(p, stat->ops_requested);
2327 p = xdr_encode_hyper(p, stat->bytes_requested);
2328 p = xdr_encode_hyper(p, stat->ops_completed);
2329 p = xdr_encode_hyper(p, stat->bytes_completed);
2330 p = xdr_encode_hyper(p, stat->bytes_not_delivered);
2331 ff_layout_encode_nfstime(xdr, stat->total_busy_time);
2332 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time);
2333}
2334
2335static void
422c93c8
TM		 2336ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr,
2337 const struct nfs42_layoutstat_devinfo *devinfo,
2338 struct nfs4_ff_layout_mirror *mirror)
27c43064 2339{
27c43064
PT		 2340 struct nfs4_pnfs_ds_addr *da;
2341 struct nfs4_pnfs_ds *ds = mirror->mirror_ds->ds;
2342 struct nfs_fh *fh = &mirror->fh_versions[0];
422c93c8 2343 __be32 *p;
27c43064
PT		 2344
2345 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node);
2346 dprintk("%s: DS %s: encoding address %s\n",
2347 __func__, ds->ds_remotestr, da->da_remotestr);
27c43064
PT		 2348 /* netaddr4 */
2349 ff_layout_encode_netaddr(xdr, da);
2350 /* nfs_fh4 */
2351 p = xdr_reserve_space(xdr, 4 + fh->size);
2352 xdr_encode_opaque(p, fh->data, fh->size);
2353 /* ff_io_latency4 read */
2354 spin_lock(&mirror->lock);
2355 ff_layout_encode_io_latency(xdr, &mirror->read_stat.io_stat);
2356 /* ff_io_latency4 write */
2357 ff_layout_encode_io_latency(xdr, &mirror->write_stat.io_stat);
2358 spin_unlock(&mirror->lock);
2359 /* nfstime4 */
2360 ff_layout_encode_nfstime(xdr, ktime_sub(ktime_get(), mirror->start_time));
2361 /* bool */
2362 p = xdr_reserve_space(xdr, 4);
2363 *p = cpu_to_be32(false);
422c93c8
TM		 2364}
2365
2366static void
2367ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args,
2368 const struct nfs4_xdr_opaque_data *opaque)
2369{
2370 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque,
2371 struct nfs42_layoutstat_devinfo, ld_private);
2372 __be32 *start;
2373
2374 /* layoutupdate length */
2375 start = xdr_reserve_space(xdr, 4);
2376 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data);
27c43064
PT		 2377
2378 *start = cpu_to_be32((xdr->p - start - 1) * 4);
2379}
2380
422c93c8
TM		 2381static void
2382ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque)
2383{
2384 struct nfs4_ff_layout_mirror *mirror = opaque->data;
2385
2386 ff_layout_put_mirror(mirror);
2387}
2388
2389static const struct nfs4_xdr_opaque_ops layoutstat_ops = {
2390 .encode = ff_layout_encode_layoutstats,
2391 .free = ff_layout_free_layoutstats,
2392};
2393
266d12d4 2394static int
08e2e5bc
TM		 2395ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo,
2396 struct nfs42_layoutstat_devinfo *devinfo,
266d12d4 2397 int dev_limit)
ad4dc53e 2398{
266d12d4 2399 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo);
ad4dc53e
PT		 2400 struct nfs4_ff_layout_mirror *mirror;
2401 struct nfs4_deviceid_node *dev;
266d12d4 2402 int i = 0;
ad4dc53e 2403
266d12d4
TM		 2404 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) {
2405 if (i >= dev_limit)
ad4dc53e 2406 break;
65990d1a 2407 if (IS_ERR_OR_NULL(mirror->mirror_ds))
27c43064 2408 continue;
06946c6a
TM		 2409 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags))
2410 continue;
266d12d4 2411 /* mirror refcount put in cleanup_layoutstats */
81a090b9 2412 if (!refcount_inc_not_zero(&mirror->ref))
266d12d4
TM		 2413 continue;
2414 dev = &mirror->mirror_ds->id_node;
ad4dc53e 2415 memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
266d12d4
TM		 2416 devinfo->offset = 0;
2417 devinfo->length = NFS4_MAX_UINT64;
2f8220c1 2418 spin_lock(&mirror->lock);
d099d7b8 2419 devinfo->read_count = mirror->read_stat.io_stat.ops_completed;
ad4dc53e 2420 devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
d099d7b8 2421 devinfo->write_count = mirror->write_stat.io_stat.ops_completed;
ad4dc53e 2422 devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
2f8220c1 2423 spin_unlock(&mirror->lock);
ad4dc53e 2424 devinfo->layout_type = LAYOUT_FLEX_FILES;
422c93c8
TM		 2425 devinfo->ld_private.ops = &layoutstat_ops;
2426 devinfo->ld_private.data = mirror;
ad4dc53e 2427
08e2e5bc 2428 devinfo++;
266d12d4 2429 i++;
ad4dc53e 2430 }
266d12d4 2431 return i;
ad4dc53e
PT		 2432}
2433
2434static int
2435ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
2436{
266d12d4 2437 struct nfs4_flexfile_layout *ff_layout;
08e2e5bc 2438 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV;
ad4dc53e 2439
ad4dc53e 2440 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
266d12d4 2441 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), GFP_NOIO);
ad4dc53e
PT		 2442 if (!args->devinfo)
2443 return -ENOMEM;
2444
ad4dc53e 2445 spin_lock(&args->inode->i_lock);
08e2e5bc
TM		 2446 ff_layout = FF_LAYOUT_FROM_HDR(NFS_I(args->inode)->layout);
2447 args->num_dev = ff_layout_mirror_prepare_stats(&ff_layout->generic_hdr,
2448 &args->devinfo[0], dev_count);
ad4dc53e 2449 spin_unlock(&args->inode->i_lock);
46c98c6d
TM		 2450 if (!args->num_dev) {
2451 kfree(args->devinfo);
2452 args->devinfo = NULL;
2453 return -ENOENT;
2454 }
ad4dc53e
PT		 2455
2456 return 0;
2457}
2458
76b2a303
TM		 2459static int
2460ff_layout_set_layoutdriver(struct nfs_server *server,
2461 const struct nfs_fh *dummy)
2462{
2463#if IS_ENABLED(CONFIG_NFS_V4_2)
2464 server->caps |= NFS_CAP_LAYOUTSTATS;
2465#endif
2466 return 0;
2467}
2468
d67ae825
TH		 2469static struct pnfs_layoutdriver_type flexfilelayout_type = {
2470 .id = LAYOUT_FLEX_FILES,
2471 .name = "LAYOUT_FLEX_FILES",
2472 .owner = THIS_MODULE,
f86c3ac5 2473 .flags = PNFS_LAYOUTGET_ON_OPEN,
28ced9a8 2474 .max_layoutget_response = 4096, /* 1 page or so... */
76b2a303 2475 .set_layoutdriver = ff_layout_set_layoutdriver,
d67ae825
TH		 2476 .alloc_layout_hdr = ff_layout_alloc_layout_hdr,
2477 .free_layout_hdr = ff_layout_free_layout_hdr,
2478 .alloc_lseg = ff_layout_alloc_lseg,
2479 .free_lseg = ff_layout_free_lseg,
0762ed2c 2480 .add_lseg = ff_layout_add_lseg,
d67ae825
TH		 2481 .pg_read_ops = &ff_layout_pg_read_ops,
2482 .pg_write_ops = &ff_layout_pg_write_ops,
2483 .get_ds_info = ff_layout_get_ds_info,
fc87701b 2484 .free_deviceid_node = ff_layout_free_deviceid_node,
338d00cf 2485 .mark_request_commit = pnfs_layout_mark_request_commit,
d67ae825
TH		 2486 .clear_request_commit = pnfs_generic_clear_request_commit,
2487 .scan_commit_lists = pnfs_generic_scan_commit_lists,
2488 .recover_commit_reqs = pnfs_generic_recover_commit_reqs,
2489 .commit_pagelist = ff_layout_commit_pagelist,
2490 .read_pagelist = ff_layout_read_pagelist,
2491 .write_pagelist = ff_layout_write_pagelist,
2492 .alloc_deviceid_node = ff_layout_alloc_deviceid_node,
5b9b3c85 2493 .prepare_layoutreturn = ff_layout_prepare_layoutreturn,
5bb89b47 2494 .sync = pnfs_nfs_generic_sync,
ad4dc53e 2495 .prepare_layoutstats = ff_layout_prepare_layoutstats,
d67ae825
TH		 2496};
2497
2498static int __init nfs4flexfilelayout_init(void)
2499{
2500 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n",
2501 __func__);
2502 return pnfs_register_layoutdriver(&flexfilelayout_type);
2503}
2504
2505static void __exit nfs4flexfilelayout_exit(void)
2506{
2507 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n",
2508 __func__);
2509 pnfs_unregister_layoutdriver(&flexfilelayout_type);
2510}
2511
2512MODULE_ALIAS("nfs-layouttype4-4");
2513
2514MODULE_LICENSE("GPL");
2515MODULE_DESCRIPTION("The NFSv4 flexfile layout driver");
2516
2517module_init(nfs4flexfilelayout_init);
2518module_exit(nfs4flexfilelayout_exit);
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