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Merge tag 'kvm-ppc-fixes-4.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-block.git] / fs / nfs / pnfs.c
CommitLineData
85e174ba
RL		 1/*
2 * pNFS functions to call and manage layout drivers.
3 *
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#include <linux/nfs_fs.h>
493292dd 31#include <linux/nfs_page.h>
143cb494 32#include <linux/module.h>
ca440c38 33#include <linux/sort.h>
974cec8c 34#include "internal.h"
85e174ba 35#include "pnfs.h"
64419a9b 36#include "iostat.h"
cc668ab3 37#include "nfs4trace.h"
40dd4b7a 38#include "delegation.h"
8733408d 39#include "nfs42.h"
1b146fcf 40#include "nfs4_fs.h"
85e174ba
RL		 41
42#define NFSDBG_FACILITY NFSDBG_PNFS
25c75333 43#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
85e174ba 44
02c35fca
FI		 45/* Locking:
46 *
47 * pnfs_spinlock:
48 * protects pnfs_modules_tbl.
49 */
50static DEFINE_SPINLOCK(pnfs_spinlock);
51
52/*
53 * pnfs_modules_tbl holds all pnfs modules
54 */
55static LIST_HEAD(pnfs_modules_tbl);
56
13c13a6a 57static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
68f74479
TM		 58static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
59 struct list_head *free_me,
60 const struct pnfs_layout_range *range,
61 u32 seq);
fe1cf946
TM		 62static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
63 struct list_head *tmp_list);
aa1e0e3a 64
02c35fca
FI		 65/* Return the registered pnfs layout driver module matching given id */
66static struct pnfs_layoutdriver_type *
67find_pnfs_driver_locked(u32 id)
68{
69 struct pnfs_layoutdriver_type *local;
70
71 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
72 if (local->id == id)
73 goto out;
74 local = NULL;
75out:
76 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
77 return local;
78}
79
85e174ba
RL		 80static struct pnfs_layoutdriver_type *
81find_pnfs_driver(u32 id)
82{
02c35fca
FI		 83 struct pnfs_layoutdriver_type *local;
84
85 spin_lock(&pnfs_spinlock);
86 local = find_pnfs_driver_locked(id);
0a9c63fa
TM		 87 if (local != NULL && !try_module_get(local->owner)) {
88 dprintk("%s: Could not grab reference on module\n", __func__);
89 local = NULL;
90 }
02c35fca
FI		 91 spin_unlock(&pnfs_spinlock);
92 return local;
85e174ba
RL		 93}
94
95void
96unset_pnfs_layoutdriver(struct nfs_server *nfss)
97{
738fd0f3
BH		 98 if (nfss->pnfs_curr_ld) {
99 if (nfss->pnfs_curr_ld->clear_layoutdriver)
100 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
2a4c8994
TM		 101 /* Decrement the MDS count. Purge the deviceid cache if zero */
102 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
103 nfs4_deviceid_purge_client(nfss->nfs_client);
02c35fca 104 module_put(nfss->pnfs_curr_ld->owner);
738fd0f3 105 }
85e174ba
RL		 106 nfss->pnfs_curr_ld = NULL;
107}
108
ca440c38
JL		 109/*
110 * When the server sends a list of layout types, we choose one in the order
111 * given in the list below.
112 *
113 * FIXME: should this list be configurable in some fashion? module param?
114 * mount option? something else?
115 */
116static const u32 ld_prefs[] = {
117 LAYOUT_SCSI,
118 LAYOUT_BLOCK_VOLUME,
119 LAYOUT_OSD2_OBJECTS,
120 LAYOUT_FLEX_FILES,
121 LAYOUT_NFSV4_1_FILES,
122 0
123};
124
125static int
126ld_cmp(const void *e1, const void *e2)
127{
128 u32 ld1 = *((u32 *)e1);
129 u32 ld2 = *((u32 *)e2);
130 int i;
131
132 for (i = 0; ld_prefs[i] != 0; i++) {
133 if (ld1 == ld_prefs[i])
134 return -1;
135
136 if (ld2 == ld_prefs[i])
137 return 1;
138 }
139 return 0;
140}
141
85e174ba
RL		 142/*
143 * Try to set the server's pnfs module to the pnfs layout type specified by id.
144 * Currently only one pNFS layout driver per filesystem is supported.
145 *
3132e49e 146 * @ids array of layout types supported by MDS.
85e174ba
RL		 147 */
148void
738fd0f3 149set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
ca440c38 150 struct nfs_fsinfo *fsinfo)
85e174ba
RL		 151{
152 struct pnfs_layoutdriver_type *ld_type = NULL;
3132e49e 153 u32 id;
ca440c38 154 int i;
85e174ba 155
19274716
AS		 156 if (fsinfo->nlayouttypes == 0)
157 goto out_no_driver;
85e174ba
RL		 158 if (!(server->nfs_client->cl_exchange_flags &
159 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
3132e49e
JL		 160 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
161 __func__, server->nfs_client->cl_exchange_flags);
85e174ba
RL		 162 goto out_no_driver;
163 }
3132e49e 164
ca440c38
JL		 165 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
166 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
3132e49e 167
ca440c38
JL		 168 for (i = 0; i < fsinfo->nlayouttypes; i++) {
169 id = fsinfo->layouttype[i];
85e174ba 170 ld_type = find_pnfs_driver(id);
ca440c38
JL		 171 if (!ld_type) {
172 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
173 id);
174 ld_type = find_pnfs_driver(id);
175 }
176 if (ld_type)
177 break;
85e174ba 178 }
3132e49e
JL		 179
180 if (!ld_type) {
ca440c38 181 dprintk("%s: No pNFS module found!\n", __func__);
3132e49e
JL		 182 goto out_no_driver;
183 }
184
85e174ba 185 server->pnfs_curr_ld = ld_type;
738fd0f3
BH		 186 if (ld_type->set_layoutdriver
187 && ld_type->set_layoutdriver(server, mntfh)) {
a030889a
WAA		 188 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
189 "driver %u.\n", __func__, id);
738fd0f3
BH		 190 module_put(ld_type->owner);
191 goto out_no_driver;
192 }
2a4c8994
TM		 193 /* Bump the MDS count */
194 atomic_inc(&server->nfs_client->cl_mds_count);
ea8eecdd 195
85e174ba
RL		 196 dprintk("%s: pNFS module for %u set\n", __func__, id);
197 return;
198
199out_no_driver:
200 dprintk("%s: Using NFSv4 I/O\n", __func__);
201 server->pnfs_curr_ld = NULL;
202}
02c35fca
FI		 203
204int
205pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
206{
207 int status = -EINVAL;
208 struct pnfs_layoutdriver_type *tmp;
209
210 if (ld_type->id == 0) {
a030889a 211 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
02c35fca
FI		 212 return status;
213 }
b1f69b75 214 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
a030889a 215 printk(KERN_ERR "NFS: %s Layout driver must provide "
b1f69b75
AA		 216 "alloc_lseg and free_lseg.\n", __func__);
217 return status;
218 }
02c35fca
FI		 219
220 spin_lock(&pnfs_spinlock);
221 tmp = find_pnfs_driver_locked(ld_type->id);
222 if (!tmp) {
223 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
224 status = 0;
225 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
226 ld_type->name);
227 } else {
a030889a 228 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
02c35fca
FI		 229 __func__, ld_type->id);
230 }
231 spin_unlock(&pnfs_spinlock);
232
233 return status;
234}
235EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
236
237void
238pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
239{
240 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
241 spin_lock(&pnfs_spinlock);
242 list_del(&ld_type->pnfs_tblid);
243 spin_unlock(&pnfs_spinlock);
244}
245EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
e5e94017 246
b1f69b75
AA		 247/*
248 * pNFS client layout cache
249 */
250
cc6e5340 251/* Need to hold i_lock if caller does not already hold reference */
43f1b3da 252void
70c3bd2b 253pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
e5e94017 254{
2b28a7be 255 refcount_inc(&lo->plh_refcount);
e5e94017
BH		 256}
257
636fb9c8
BH		 258static struct pnfs_layout_hdr *
259pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
260{
261 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
57934278 262 return ld->alloc_layout_hdr(ino, gfp_flags);
636fb9c8
BH		 263}
264
265static void
266pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
267{
9c626381
TM		 268 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
269 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
270
271 if (!list_empty(&lo->plh_layouts)) {
272 struct nfs_client *clp = server->nfs_client;
273
274 spin_lock(&clp->cl_lock);
275 list_del_init(&lo->plh_layouts);
276 spin_unlock(&clp->cl_lock);
277 }
9fa40758 278 put_rpccred(lo->plh_lc_cred);
57934278 279 return ld->free_layout_hdr(lo);
636fb9c8
BH		 280}
281
e5e94017 282static void
6622c3ea 283pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
e5e94017 284{
bb346f63 285 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
cc6e5340 286 dprintk("%s: freeing layout cache %p\n", __func__, lo);
bb346f63
TM		 287 nfsi->layout = NULL;
288 /* Reset MDS Threshold I/O counters */
289 nfsi->write_io = 0;
290 nfsi->read_io = 0;
e5e94017
BH		 291}
292
b1f69b75 293void
70c3bd2b 294pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
974cec8c 295{
9c6376eb 296 struct inode *inode;
cc6e5340 297
9c6376eb
TM		 298 if (!lo)
299 return;
300 inode = lo->plh_inode;
13c13a6a
TM		 301 pnfs_layoutreturn_before_put_layout_hdr(lo);
302
2b28a7be 303 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
566f8737
PT		 304 if (!list_empty(&lo->plh_segs))
305 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
6622c3ea 306 pnfs_detach_layout_hdr(lo);
cc6e5340 307 spin_unlock(&inode->i_lock);
6622c3ea 308 pnfs_free_layout_hdr(lo);
cc6e5340 309 }
974cec8c
AA		 310}
311
4aab9732
TM		 312static void
313pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
314 u32 seq)
315{
316 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
317 iomode = IOMODE_ANY;
318 lo->plh_return_iomode = iomode;
319 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
320 if (seq != 0) {
321 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
322 lo->plh_return_seq = seq;
323 }
324}
325
ae5a459d
TM		 326static void
327pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
328{
5466d214 329 struct pnfs_layout_segment *lseg;
ae5a459d
TM		 330 lo->plh_return_iomode = 0;
331 lo->plh_return_seq = 0;
332 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
5466d214
TM		 333 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
334 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
335 continue;
336 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
337 }
ae5a459d
TM		 338}
339
362fb578
TM		 340static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
341{
342 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
343 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
344 smp_mb__after_atomic();
345 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
346 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
347}
348
fe1cf946
TM		 349static void
350pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
351 struct list_head *free_me)
352{
353 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
354 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
355 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
356 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
357 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
358 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
359}
360
7380020e
TM		 361/*
362 * Update the seqid of a layout stateid
363 */
ecf84026
TM		 364bool nfs4_layoutreturn_refresh_stateid(nfs4_stateid *dst,
365 struct pnfs_layout_range *dst_range,
366 struct inode *inode)
7380020e
TM		 367{
368 struct pnfs_layout_hdr *lo;
c16467dc
TM		 369 struct pnfs_layout_range range = {
370 .iomode = IOMODE_ANY,
371 .offset = 0,
372 .length = NFS4_MAX_UINT64,
373 };
7380020e 374 bool ret = false;
c16467dc
TM		 375 LIST_HEAD(head);
376 int err;
7380020e
TM		 377
378 spin_lock(&inode->i_lock);
379 lo = NFS_I(inode)->layout;
380 if (lo && nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
c16467dc
TM		 381 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
382 if (err != -EBUSY) {
383 dst->seqid = lo->plh_stateid.seqid;
ecf84026 384 *dst_range = range;
c16467dc
TM		 385 ret = true;
386 }
7380020e
TM		 387 }
388 spin_unlock(&inode->i_lock);
c16467dc 389 pnfs_free_lseg_list(&head);
7380020e
TM		 390 return ret;
391}
392
2454dfea
TM		 393/*
394 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
395 *
396 * In order to continue using the pnfs_layout_hdr, a full recovery
397 * is required.
398 * Note that caller must hold inode->i_lock.
399 */
5f46be04 400int
2454dfea
TM		 401pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
402 struct list_head *lseg_list)
403{
404 struct pnfs_layout_range range = {
405 .iomode = IOMODE_ANY,
406 .offset = 0,
407 .length = NFS4_MAX_UINT64,
408 };
fe1cf946 409 struct pnfs_layout_segment *lseg, *next;
2454dfea
TM		 410
411 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
fe1cf946
TM		 412 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
413 pnfs_clear_lseg_state(lseg, lseg_list);
5466d214 414 pnfs_clear_layoutreturn_info(lo);
68f74479 415 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
362fb578
TM		 416 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
417 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
418 pnfs_clear_layoutreturn_waitbit(lo);
fe1cf946 419 return !list_empty(&lo->plh_segs);
2454dfea
TM		 420}
421
b9e028fd
TM		 422static int
423pnfs_iomode_to_fail_bit(u32 iomode)
424{
425 return iomode == IOMODE_RW ?
426 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
427}
428
429static void
3e621214 430pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
b9e028fd 431{
25c75333 432 lo->plh_retry_timestamp = jiffies;
39e88fcf 433 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
2b28a7be 434 refcount_inc(&lo->plh_refcount);
3e621214
TM		 435}
436
437static void
438pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
439{
440 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
2b28a7be 441 refcount_dec(&lo->plh_refcount);
3e621214
TM		 442}
443
444static void
445pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
446{
447 struct inode *inode = lo->plh_inode;
115ce575
TM		 448 struct pnfs_layout_range range = {
449 .iomode = iomode,
450 .offset = 0,
451 .length = NFS4_MAX_UINT64,
452 };
453 LIST_HEAD(head);
3e621214
TM		 454
455 spin_lock(&inode->i_lock);
456 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
6d597e17 457 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
3e621214 458 spin_unlock(&inode->i_lock);
115ce575 459 pnfs_free_lseg_list(&head);
b9e028fd
TM		 460 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
461 iomode == IOMODE_RW ? "RW" : "READ");
462}
463
464static bool
465pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
466{
25c75333 467 unsigned long start, end;
3e621214
TM		 468 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
469
470 if (test_bit(fail_bit, &lo->plh_flags) == 0)
25c75333
TM		 471 return false;
472 end = jiffies;
473 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
474 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
475 /* It is time to retry the failed layoutgets */
3e621214 476 pnfs_layout_clear_fail_bit(lo, fail_bit);
25c75333
TM		 477 return false;
478 }
479 return true;
b9e028fd
TM		 480}
481
974cec8c 482static void
119cef97
TM		 483pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
484 const struct pnfs_layout_range *range,
485 const nfs4_stateid *stateid)
974cec8c 486{
566052c5 487 INIT_LIST_HEAD(&lseg->pls_list);
a9bae566 488 INIT_LIST_HEAD(&lseg->pls_lc_list);
eba6dd69 489 refcount_set(&lseg->pls_refcount, 1);
4541d16c 490 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
566052c5 491 lseg->pls_layout = lo;
119cef97
TM		 492 lseg->pls_range = *range;
493 lseg->pls_seq = be32_to_cpu(stateid->seqid);
974cec8c
AA		 494}
495
905ca191 496static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
974cec8c 497{
68f74479
TM		 498 if (lseg != NULL) {
499 struct inode *inode = lseg->pls_layout->plh_inode;
500 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
501 }
974cec8c
AA		 502}
503
d684d2ae 504static void
57036a37
TM		 505pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
506 struct pnfs_layout_segment *lseg)
d684d2ae 507{
d20581aa 508 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
d684d2ae 509 list_del_init(&lseg->pls_list);
8f0d27dc 510 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
2b28a7be 511 refcount_dec(&lo->plh_refcount);
abb3e1c8
TM		 512 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
513 return;
7b650994
TM		 514 if (list_empty(&lo->plh_segs) &&
515 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
516 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
334a8f37
TM		 517 if (atomic_read(&lo->plh_outstanding) == 0)
518 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
173f77e9 519 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
2d148c7e 520 }
d684d2ae
FI		 521}
522
68f74479
TM		 523static bool
524pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
525 struct pnfs_layout_segment *lseg)
526{
527 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
528 pnfs_layout_is_valid(lo)) {
4aab9732 529 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
68f74479
TM		 530 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
531 return true;
532 }
533 return false;
534}
535
bae724ef 536void
9369a431 537pnfs_put_lseg(struct pnfs_layout_segment *lseg)
974cec8c 538{
57036a37 539 struct pnfs_layout_hdr *lo;
d684d2ae
FI		 540 struct inode *inode;
541
542 if (!lseg)
543 return;
544
4541d16c 545 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
eba6dd69 546 refcount_read(&lseg->pls_refcount),
4541d16c 547 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
4ef2e4f8 548
57036a37
TM		 549 lo = lseg->pls_layout;
550 inode = lo->plh_inode;
4ef2e4f8 551
eba6dd69 552 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
faa4a54f
TM		 553 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
554 spin_unlock(&inode->i_lock);
555 return;
556 }
8f0d27dc 557 pnfs_get_layout_hdr(lo);
4ef2e4f8 558 pnfs_layout_remove_lseg(lo, lseg);
68f74479
TM		 559 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
560 lseg = NULL;
4ef2e4f8
TM		 561 spin_unlock(&inode->i_lock);
562 pnfs_free_lseg(lseg);
563 pnfs_put_layout_hdr(lo);
4541d16c 564 }
4541d16c 565}
9369a431 566EXPORT_SYMBOL_GPL(pnfs_put_lseg);
974cec8c 567
fb3296eb
BH		 568/*
569 * is l2 fully contained in l1?
570 * start1 end1
571 * [----------------------------------)
572 * start2 end2
573 * [----------------)
574 */
3cb2df17 575static bool
7dc0ac70 576pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
3cb2df17 577 const struct pnfs_layout_range *l2)
fb3296eb
BH		 578{
579 u64 start1 = l1->offset;
17822b20 580 u64 end1 = pnfs_end_offset(start1, l1->length);
fb3296eb 581 u64 start2 = l2->offset;
17822b20 582 u64 end2 = pnfs_end_offset(start2, l2->length);
fb3296eb
BH		 583
584 return (start1 <= start2) && (end1 >= end2);
585}
586
24956804
TM		 587static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
588 struct list_head *tmp_list)
589{
eba6dd69 590 if (!refcount_dec_and_test(&lseg->pls_refcount))
24956804
TM		 591 return false;
592 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
593 list_add(&lseg->pls_list, tmp_list);
594 return true;
595}
596
4541d16c
FI		 597/* Returns 1 if lseg is removed from list, 0 otherwise */
598static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
599 struct list_head *tmp_list)
600{
601 int rv = 0;
602
603 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
604 /* Remove the reference keeping the lseg in the
605 * list. It will now be removed when all
606 * outstanding io is finished.
607 */
d684d2ae 608 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
eba6dd69 609 refcount_read(&lseg->pls_refcount));
24956804 610 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
d684d2ae 611 rv = 1;
4541d16c
FI		 612 }
613 return rv;
614}
615
6d597e17
JL		 616/*
617 * Compare 2 layout stateid sequence ids, to see which is newer,
618 * taking into account wraparound issues.
619 */
620static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
621{
622 return (s32)(s1 - s2) > 0;
623}
624
e036f464
TM		 625static bool
626pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
627 const struct pnfs_layout_range *recall_range)
628{
629 return (recall_range->iomode == IOMODE_ANY ||
630 lseg_range->iomode == recall_range->iomode) &&
631 pnfs_lseg_range_intersecting(lseg_range, recall_range);
632}
633
634static bool
635pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
636 const struct pnfs_layout_range *recall_range,
637 u32 seq)
638{
639 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
640 return false;
641 if (recall_range == NULL)
642 return true;
643 return pnfs_should_free_range(&lseg->pls_range, recall_range);
644}
645
6d597e17
JL		 646/**
647 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
648 * @lo: layout header containing the lsegs
649 * @tmp_list: list head where doomed lsegs should go
650 * @recall_range: optional recall range argument to match (may be NULL)
651 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
652 *
653 * Walk the list of lsegs in the layout header, and tear down any that should
654 * be destroyed. If "recall_range" is specified then the segment must match
655 * that range. If "seq" is non-zero, then only match segments that were handed
656 * out at or before that sequence.
657 *
658 * Returns number of matching invalid lsegs remaining in list after scanning
659 * it and purging them.
4541d16c 660 */
43f1b3da 661int
49a85061 662pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
4541d16c 663 struct list_head *tmp_list,
6d597e17
JL		 664 const struct pnfs_layout_range *recall_range,
665 u32 seq)
974cec8c
AA		 666{
667 struct pnfs_layout_segment *lseg, *next;
71b39854 668 int remaining = 0;
974cec8c
AA		 669
670 dprintk("%s:Begin lo %p\n", __func__, lo);
671
8006bfba 672 if (list_empty(&lo->plh_segs))
38511722 673 return 0;
4541d16c 674 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
e036f464 675 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
b3dce6a2 676 dprintk("%s: freeing lseg %p iomode %d seq %u "
4541d16c 677 "offset %llu length %llu\n", __func__,
6d597e17
JL		 678 lseg, lseg->pls_range.iomode, lseg->pls_seq,
679 lseg->pls_range.offset, lseg->pls_range.length);
71b39854
TM		 680 if (!mark_lseg_invalid(lseg, tmp_list))
681 remaining++;
4541d16c 682 }
71b39854
TM		 683 dprintk("%s:Return %i\n", __func__, remaining);
684 return remaining;
974cec8c
AA		 685}
686
68f74479
TM		 687static void
688pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
689 struct list_head *free_me,
690 const struct pnfs_layout_range *range,
691 u32 seq)
692{
693 struct pnfs_layout_segment *lseg, *next;
694
695 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
696 if (pnfs_match_lseg_recall(lseg, range, seq))
697 list_move_tail(&lseg->pls_list, free_me);
698 }
699}
700
f49f9baa 701/* note free_me must contain lsegs from a single layout_hdr */
43f1b3da 702void
4541d16c 703pnfs_free_lseg_list(struct list_head *free_me)
974cec8c 704{
4541d16c 705 struct pnfs_layout_segment *lseg, *tmp;
f49f9baa
FI		 706
707 if (list_empty(free_me))
708 return;
709
4541d16c 710 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
566052c5 711 list_del(&lseg->pls_list);
905ca191 712 pnfs_free_lseg(lseg);
974cec8c
AA		 713 }
714}
715
e5e94017
BH		 716void
717pnfs_destroy_layout(struct nfs_inode *nfsi)
718{
719 struct pnfs_layout_hdr *lo;
974cec8c 720 LIST_HEAD(tmp_list);
e5e94017
BH		 721
722 spin_lock(&nfsi->vfs_inode.i_lock);
723 lo = nfsi->layout;
724 if (lo) {
3e621214 725 pnfs_get_layout_hdr(lo);
2454dfea 726 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
3e621214
TM		 727 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
728 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
729 spin_unlock(&nfsi->vfs_inode.i_lock);
730 pnfs_free_lseg_list(&tmp_list);
1f18b82c 731 nfs_commit_inode(&nfsi->vfs_inode, 0);
3e621214
TM		 732 pnfs_put_layout_hdr(lo);
733 } else
734 spin_unlock(&nfsi->vfs_inode.i_lock);
974cec8c 735}
041245c8 736EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
974cec8c 737
fd9a8d71
TM		 738static bool
739pnfs_layout_add_bulk_destroy_list(struct inode *inode,
740 struct list_head *layout_list)
974cec8c
AA		 741{
742 struct pnfs_layout_hdr *lo;
fd9a8d71 743 bool ret = false;
974cec8c 744
fd9a8d71
TM		 745 spin_lock(&inode->i_lock);
746 lo = NFS_I(inode)->layout;
747 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
748 pnfs_get_layout_hdr(lo);
749 list_add(&lo->plh_bulk_destroy, layout_list);
750 ret = true;
751 }
752 spin_unlock(&inode->i_lock);
753 return ret;
754}
755
756/* Caller must hold rcu_read_lock and clp->cl_lock */
757static int
758pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
759 struct nfs_server *server,
760 struct list_head *layout_list)
761{
762 struct pnfs_layout_hdr *lo, *next;
763 struct inode *inode;
764
765 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
b85f5620
TM		 766 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
767 continue;
fd9a8d71
TM		 768 inode = igrab(lo->plh_inode);
769 if (inode == NULL)
770 continue;
771 list_del_init(&lo->plh_layouts);
772 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
773 continue;
774 rcu_read_unlock();
775 spin_unlock(&clp->cl_lock);
776 iput(inode);
777 spin_lock(&clp->cl_lock);
778 rcu_read_lock();
779 return -EAGAIN;
780 }
781 return 0;
782}
783
784static int
785pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
786 bool is_bulk_recall)
787{
788 struct pnfs_layout_hdr *lo;
789 struct inode *inode;
fd9a8d71
TM		 790 LIST_HEAD(lseg_list);
791 int ret = 0;
792
793 while (!list_empty(layout_list)) {
794 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
795 plh_bulk_destroy);
796 dprintk("%s freeing layout for inode %lu\n", __func__,
797 lo->plh_inode->i_ino);
798 inode = lo->plh_inode;
7c5d1875
CH		 799
800 pnfs_layoutcommit_inode(inode, false);
801
fd9a8d71
TM		 802 spin_lock(&inode->i_lock);
803 list_del_init(&lo->plh_bulk_destroy);
9fd4b9fc
TM		 804 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
805 if (is_bulk_recall)
806 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
fd9a8d71 807 ret = -EAGAIN;
9fd4b9fc 808 }
fd9a8d71
TM		 809 spin_unlock(&inode->i_lock);
810 pnfs_free_lseg_list(&lseg_list);
b20135d0
TM		 811 /* Free all lsegs that are attached to commit buckets */
812 nfs_commit_inode(inode, 0);
fd9a8d71
TM		 813 pnfs_put_layout_hdr(lo);
814 iput(inode);
815 }
816 return ret;
817}
818
819int
820pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
821 struct nfs_fsid *fsid,
822 bool is_recall)
823{
824 struct nfs_server *server;
825 LIST_HEAD(layout_list);
c47abcf8 826
974cec8c 827 spin_lock(&clp->cl_lock);
6382a441 828 rcu_read_lock();
fd9a8d71 829restart:
6382a441 830 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
fd9a8d71
TM		 831 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
832 continue;
833 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
834 server,
835 &layout_list) != 0)
836 goto restart;
6382a441
WAA		 837 }
838 rcu_read_unlock();
974cec8c
AA		 839 spin_unlock(&clp->cl_lock);
840
fd9a8d71
TM		 841 if (list_empty(&layout_list))
842 return 0;
843 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
844}
845
846int
847pnfs_destroy_layouts_byclid(struct nfs_client *clp,
848 bool is_recall)
849{
850 struct nfs_server *server;
851 LIST_HEAD(layout_list);
852
853 spin_lock(&clp->cl_lock);
854 rcu_read_lock();
855restart:
856 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
857 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
858 server,
859 &layout_list) != 0)
860 goto restart;
974cec8c 861 }
fd9a8d71
TM		 862 rcu_read_unlock();
863 spin_unlock(&clp->cl_lock);
864
865 if (list_empty(&layout_list))
866 return 0;
867 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
868}
869
870/*
871 * Called by the state manger to remove all layouts established under an
872 * expired lease.
873 */
874void
875pnfs_destroy_all_layouts(struct nfs_client *clp)
876{
877 nfs4_deviceid_mark_client_invalid(clp);
878 nfs4_deviceid_purge_client(clp);
879
880 pnfs_destroy_layouts_byclid(clp, false);
e5e94017
BH		 881}
882
fd6002e9 883/* update lo->plh_stateid with new if is more recent */
43f1b3da
FI		 884void
885pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
886 bool update_barrier)
b1f69b75 887{
ecebb80b 888 u32 oldseq, newseq, new_barrier = 0;
b1f69b75 889
2d2f24ad
TM		 890 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
891 newseq = be32_to_cpu(new->seqid);
2a59a041
TM		 892
893 if (!pnfs_layout_is_valid(lo)) {
894 nfs4_stateid_copy(&lo->plh_stateid, new);
895 lo->plh_barrier = newseq;
896 pnfs_clear_layoutreturn_info(lo);
897 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
898 return;
899 }
900 if (pnfs_seqid_is_newer(newseq, oldseq)) {
f597c537 901 nfs4_stateid_copy(&lo->plh_stateid, new);
ecebb80b
TM		 902 /*
903 * Because of wraparound, we want to keep the barrier
904 * "close" to the current seqids.
905 */
906 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
43f1b3da 907 }
ecebb80b
TM		 908 if (update_barrier)
909 new_barrier = be32_to_cpu(new->seqid);
910 else if (new_barrier == 0)
911 return;
2a59a041 912 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
ecebb80b 913 lo->plh_barrier = new_barrier;
b1f69b75
AA		 914}
915
cf7d63f1 916static bool
19c54aba
TM		 917pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
918 const nfs4_stateid *stateid)
43f1b3da 919{
19c54aba 920 u32 seqid = be32_to_cpu(stateid->seqid);
25a1a621 921
19c54aba
TM		 922 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
923}
924
925/* lget is set to 1 if called from inside send_layoutget call chain */
926static bool
e1c06f80 927pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
19c54aba 928{
f7e8917a 929 return lo->plh_block_lgets ||
e1c06f80 930 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
cf7d63f1
FI		 931}
932
5e36e2a9
FI		 933static struct nfs_server *
934pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
935{
936 struct nfs_server *server;
937
78746a38 938 if (inode) {
5e36e2a9 939 server = NFS_SERVER(inode);
78746a38 940 } else {
5e36e2a9
FI		 941 struct dentry *parent_dir = dget_parent(ctx->dentry);
942 server = NFS_SERVER(parent_dir->d_inode);
943 dput(parent_dir);
944 }
945 return server;
946}
947
29a8bfe5
TM		 948static void nfs4_free_pages(struct page **pages, size_t size)
949{
950 int i;
951
952 if (!pages)
953 return;
954
955 for (i = 0; i < size; i++) {
956 if (!pages[i])
957 break;
958 __free_page(pages[i]);
959 }
960 kfree(pages);
961}
962
963static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
964{
965 struct page **pages;
966 int i;
967
968 pages = kcalloc(size, sizeof(struct page *), gfp_flags);
969 if (!pages) {
970 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
971 return NULL;
972 }
973
974 for (i = 0; i < size; i++) {
975 pages[i] = alloc_page(gfp_flags);
976 if (!pages[i]) {
977 dprintk("%s: failed to allocate page\n", __func__);
978 nfs4_free_pages(pages, size);
979 return NULL;
980 }
981 }
982
983 return pages;
984}
985
587f03de 986static struct nfs4_layoutget *
5e36e2a9 987pnfs_alloc_init_layoutget_args(struct inode *ino,
e5e94017 988 struct nfs_open_context *ctx,
2409a976 989 const nfs4_stateid *stateid,
e144e539 990 const struct pnfs_layout_range *range,
587f03de 991 gfp_t gfp_flags)
e5e94017 992{
5e36e2a9 993 struct nfs_server *server = pnfs_find_server(ino, ctx);
dacb452d 994 size_t max_pages = max_response_pages(server);
b1f69b75 995 struct nfs4_layoutget *lgp;
b1f69b75
AA		 996
997 dprintk("--> %s\n", __func__);
e5e94017 998
83026d80
JL		 999 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1000 if (lgp == NULL)
587f03de 1001 return NULL;
83026d80 1002
dacb452d
FI		 1003 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1004 if (!lgp->args.layout.pages) {
1005 kfree(lgp);
1006 return NULL;
1007 }
1008 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1009 lgp->res.layoutp = &lgp->args.layout;
1010
d49e0d5b
TM		 1011 /* Don't confuse uninitialised result and success */
1012 lgp->res.status = -NFS4ERR_DELAY;
83026d80
JL		 1013
1014 lgp->args.minlength = PAGE_SIZE;
1015 if (lgp->args.minlength > range->length)
1016 lgp->args.minlength = range->length;
5e36e2a9
FI		 1017 if (ino) {
1018 loff_t i_size = i_size_read(ino);
1019
1020 if (range->iomode == IOMODE_READ) {
1021 if (range->offset >= i_size)
1022 lgp->args.minlength = 0;
1023 else if (i_size - range->offset < lgp->args.minlength)
1024 lgp->args.minlength = i_size - range->offset;
1025 }
d03ab29d 1026 }
83026d80
JL		 1027 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1028 pnfs_copy_range(&lgp->args.range, range);
1029 lgp->args.type = server->pnfs_curr_ld->id;
1030 lgp->args.inode = ino;
1031 lgp->args.ctx = get_nfs_open_context(ctx);
183d9e7b 1032 nfs4_stateid_copy(&lgp->args.stateid, stateid);
83026d80 1033 lgp->gfp_flags = gfp_flags;
2409a976 1034 lgp->cred = get_rpccred(ctx->cred);
587f03de 1035 return lgp;
974cec8c
AA		 1036}
1037
29a8bfe5
TM		 1038void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1039{
1040 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1041
1042 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1043 if (lgp->args.inode)
1044 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout);
1045 put_rpccred(lgp->cred);
1046 put_nfs_open_context(lgp->args.ctx);
1047 kfree(lgp);
1048}
1049
24956804
TM		 1050static void pnfs_clear_layoutcommit(struct inode *inode,
1051 struct list_head *head)
1052{
1053 struct nfs_inode *nfsi = NFS_I(inode);
1054 struct pnfs_layout_segment *lseg, *tmp;
1055
1056 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1057 return;
1058 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1059 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1060 continue;
1061 pnfs_lseg_dec_and_remove_zero(lseg, head);
1062 }
1063}
1064
68f74479 1065void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
2a974425 1066 const nfs4_stateid *arg_stateid,
68f74479 1067 const struct pnfs_layout_range *range,
68f74479
TM		 1068 const nfs4_stateid *stateid)
1069{
1070 struct inode *inode = lo->plh_inode;
1071 LIST_HEAD(freeme);
1072
1073 spin_lock(&inode->i_lock);
2a974425
TM		 1074 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
1075 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1076 goto out_unlock;
68f74479 1077 if (stateid) {
2a974425
TM		 1078 u32 seq = be32_to_cpu(arg_stateid->seqid);
1079
68f74479
TM		 1080 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1081 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1082 pnfs_set_layout_stateid(lo, stateid, true);
1083 } else
1084 pnfs_mark_layout_stateid_invalid(lo, &freeme);
2a974425 1085out_unlock:
68f74479
TM		 1086 pnfs_clear_layoutreturn_waitbit(lo);
1087 spin_unlock(&inode->i_lock);
1088 pnfs_free_lseg_list(&freeme);
1089
1090}
1091
13c13a6a 1092static bool
e5fd1904
TM		 1093pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1094 nfs4_stateid *stateid,
1095 enum pnfs_iomode *iomode)
13c13a6a 1096{
bf0291dd
TM		 1097 /* Serialise LAYOUTGET/LAYOUTRETURN */
1098 if (atomic_read(&lo->plh_outstanding) != 0)
1099 return false;
6604b203 1100 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
13c13a6a 1101 return false;
6604b203 1102 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
13c13a6a 1103 pnfs_get_layout_hdr(lo);
e5fd1904
TM		 1104 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1105 if (stateid != NULL) {
1106 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1107 if (lo->plh_return_seq != 0)
1108 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1109 }
1110 if (iomode != NULL)
1111 *iomode = lo->plh_return_iomode;
1112 pnfs_clear_layoutreturn_info(lo);
1113 return true;
1114 }
1115 if (stateid != NULL)
1116 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1117 if (iomode != NULL)
1118 *iomode = IOMODE_ANY;
13c13a6a
TM		 1119 return true;
1120}
1121
828ed9ec
TM		 1122static void
1123pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1124 struct pnfs_layout_hdr *lo,
1125 const nfs4_stateid *stateid,
1126 enum pnfs_iomode iomode)
1127{
1128 struct inode *inode = lo->plh_inode;
1129
1130 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1131 args->inode = inode;
1132 args->range.iomode = iomode;
1133 args->range.offset = 0;
1134 args->range.length = NFS4_MAX_UINT64;
1135 args->layout = lo;
1136 nfs4_stateid_copy(&args->stateid, stateid);
1137}
1138
f40eb5d0 1139static int
ed429d6b 1140pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
6c16605d 1141 enum pnfs_iomode iomode, bool sync)
f40eb5d0
PT		 1142{
1143 struct inode *ino = lo->plh_inode;
287bd3e9 1144 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
f40eb5d0
PT		 1145 struct nfs4_layoutreturn *lrp;
1146 int status = 0;
1147
e4af440a 1148 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
f40eb5d0
PT		 1149 if (unlikely(lrp == NULL)) {
1150 status = -ENOMEM;
1151 spin_lock(&ino->i_lock);
d67ae825 1152 pnfs_clear_layoutreturn_waitbit(lo);
f40eb5d0
PT		 1153 spin_unlock(&ino->i_lock);
1154 pnfs_put_layout_hdr(lo);
1155 goto out;
1156 }
1157
828ed9ec 1158 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
4d796d75 1159 lrp->args.ld_private = &lrp->ld_private;
f40eb5d0
PT		 1160 lrp->clp = NFS_SERVER(ino)->nfs_client;
1161 lrp->cred = lo->plh_lc_cred;
287bd3e9
TM		 1162 if (ld->prepare_layoutreturn)
1163 ld->prepare_layoutreturn(&lrp->args);
f40eb5d0 1164
6c16605d 1165 status = nfs4_proc_layoutreturn(lrp, sync);
f40eb5d0
PT		 1166out:
1167 dprintk("<-- %s status: %d\n", __func__, status);
1168 return status;
1169}
1170
13c13a6a
TM		 1171/* Return true if layoutreturn is needed */
1172static bool
1173pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1174{
1175 struct pnfs_layout_segment *s;
f0b42981
TM		 1176 enum pnfs_iomode iomode;
1177 u32 seq;
13c13a6a 1178
2370abda 1179 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
13c13a6a
TM		 1180 return false;
1181
f0b42981
TM		 1182 seq = lo->plh_return_seq;
1183 iomode = lo->plh_return_iomode;
1184
1185 /* Defer layoutreturn until all recalled lsegs are done */
13c13a6a 1186 list_for_each_entry(s, &lo->plh_segs, pls_list) {
f0b42981
TM		 1187 if (seq && pnfs_seqid_is_newer(s->pls_seq, seq))
1188 continue;
1189 if (iomode != IOMODE_ANY && s->pls_range.iomode != iomode)
1190 continue;
13c13a6a
TM		 1191 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1192 return false;
1193 }
1194
1195 return true;
1196}
1197
1198static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1199{
1200 struct inode *inode= lo->plh_inode;
1201
2370abda 1202 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
13c13a6a
TM		 1203 return;
1204 spin_lock(&inode->i_lock);
1205 if (pnfs_layout_need_return(lo)) {
1206 nfs4_stateid stateid;
1207 enum pnfs_iomode iomode;
1208 bool send;
1209
e5fd1904 1210 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
13c13a6a
TM		 1211 spin_unlock(&inode->i_lock);
1212 if (send) {
1213 /* Send an async layoutreturn so we dont deadlock */
1214 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1215 }
1216 } else
1217 spin_unlock(&inode->i_lock);
1218}
1219
293b3b06
AA		 1220/*
1221 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1222 * when the layout segment list is empty.
1223 *
1224 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1225 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1226 * deviceid is marked invalid.
1227 */
cbe82603
BH		 1228int
1229_pnfs_return_layout(struct inode *ino)
1230{
1231 struct pnfs_layout_hdr *lo = NULL;
1232 struct nfs_inode *nfsi = NFS_I(ino);
1233 LIST_HEAD(tmp_list);
cbe82603 1234 nfs4_stateid stateid;
24408f52 1235 int status = 0;
93b7f7ad 1236 bool send, valid_layout;
cbe82603 1237
366d5052 1238 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
cbe82603
BH		 1239
1240 spin_lock(&ino->i_lock);
1241 lo = nfsi->layout;
e5929f3c 1242 if (!lo) {
cbe82603 1243 spin_unlock(&ino->i_lock);
293b3b06
AA		 1244 dprintk("NFS: %s no layout to return\n", __func__);
1245 goto out;
cbe82603 1246 }
cbe82603 1247 /* Reference matched in nfs4_layoutreturn_release */
70c3bd2b 1248 pnfs_get_layout_hdr(lo);
24408f52
TM		 1249 /* Is there an outstanding layoutreturn ? */
1250 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1251 spin_unlock(&ino->i_lock);
1252 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1253 TASK_UNINTERRUPTIBLE))
1254 goto out_put_layout_hdr;
1255 spin_lock(&ino->i_lock);
1256 }
93b7f7ad 1257 valid_layout = pnfs_layout_is_valid(lo);
24956804 1258 pnfs_clear_layoutcommit(ino, &tmp_list);
6d597e17 1259 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
c88953d8
CH		 1260
1261 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1262 struct pnfs_layout_range range = {
1263 .iomode = IOMODE_ANY,
1264 .offset = 0,
1265 .length = NFS4_MAX_UINT64,
1266 };
1267 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1268 }
1269
293b3b06 1270 /* Don't send a LAYOUTRETURN if list was initially empty */
93b7f7ad
OK		 1271 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1272 !valid_layout) {
293b3b06 1273 spin_unlock(&ino->i_lock);
293b3b06 1274 dprintk("NFS: %s no layout segments to return\n", __func__);
7f27392c 1275 goto out_put_layout_hdr;
293b3b06 1276 }
47abadef 1277
e5fd1904 1278 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
cbe82603 1279 spin_unlock(&ino->i_lock);
7f27392c 1280 if (send)
ed429d6b 1281 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
7f27392c 1282out_put_layout_hdr:
ee6625a9 1283 pnfs_free_lseg_list(&tmp_list);
7f27392c 1284 pnfs_put_layout_hdr(lo);
cbe82603
BH		 1285out:
1286 dprintk("<-- %s status: %d\n", __func__, status);
1287 return status;
1288}
1289
24028672
TM		 1290int
1291pnfs_commit_and_return_layout(struct inode *inode)
1292{
1293 struct pnfs_layout_hdr *lo;
1294 int ret;
1295
1296 spin_lock(&inode->i_lock);
1297 lo = NFS_I(inode)->layout;
1298 if (lo == NULL) {
1299 spin_unlock(&inode->i_lock);
1300 return 0;
1301 }
1302 pnfs_get_layout_hdr(lo);
1303 /* Block new layoutgets and read/write to ds */
1304 lo->plh_block_lgets++;
1305 spin_unlock(&inode->i_lock);
1306 filemap_fdatawait(inode->i_mapping);
1307 ret = pnfs_layoutcommit_inode(inode, true);
1308 if (ret == 0)
1309 ret = _pnfs_return_layout(inode);
1310 spin_lock(&inode->i_lock);
1311 lo->plh_block_lgets--;
1312 spin_unlock(&inode->i_lock);
1313 pnfs_put_layout_hdr(lo);
1314 return ret;
1315}
1316
1c5bd76d
TM		 1317bool pnfs_roc(struct inode *ino,
1318 struct nfs4_layoutreturn_args *args,
1319 struct nfs4_layoutreturn_res *res,
1320 const struct rpc_cred *cred)
f7e8917a 1321{
40dd4b7a
TM		 1322 struct nfs_inode *nfsi = NFS_I(ino);
1323 struct nfs_open_context *ctx;
1324 struct nfs4_state *state;
f7e8917a 1325 struct pnfs_layout_hdr *lo;
1c5bd76d 1326 struct pnfs_layout_segment *lseg, *next;
193e3aa2 1327 nfs4_stateid stateid;
1c5bd76d
TM		 1328 enum pnfs_iomode iomode = 0;
1329 bool layoutreturn = false, roc = false;
e71708d4 1330 bool skip_read = false;
f7e8917a 1331
1c5bd76d
TM		 1332 if (!nfs_have_layout(ino))
1333 return false;
29ade5db 1334retry:
f7e8917a 1335 spin_lock(&ino->i_lock);
40dd4b7a 1336 lo = nfsi->layout;
0cdc329e 1337 if (!lo || !pnfs_layout_is_valid(lo) ||
9c6376eb
TM		 1338 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1339 lo = NULL;
40dd4b7a 1340 goto out_noroc;
9c6376eb
TM		 1341 }
1342 pnfs_get_layout_hdr(lo);
29ade5db 1343 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
29ade5db
TM		 1344 spin_unlock(&ino->i_lock);
1345 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1346 TASK_UNINTERRUPTIBLE);
1347 pnfs_put_layout_hdr(lo);
1348 goto retry;
1349 }
40dd4b7a 1350
e755d638 1351 /* no roc if we hold a delegation */
e71708d4
TM		 1352 if (nfs4_check_delegation(ino, FMODE_READ)) {
1353 if (nfs4_check_delegation(ino, FMODE_WRITE))
1354 goto out_noroc;
1355 skip_read = true;
1356 }
40dd4b7a
TM		 1357
1358 list_for_each_entry(ctx, &nfsi->open_files, list) {
1359 state = ctx->state;
e71708d4
TM		 1360 if (state == NULL)
1361 continue;
40dd4b7a 1362 /* Don't return layout if there is open file state */
e71708d4 1363 if (state->state & FMODE_WRITE)
40dd4b7a 1364 goto out_noroc;
e71708d4
TM		 1365 if (state->state & FMODE_READ)
1366 skip_read = true;
40dd4b7a
TM		 1367 }
1368
e755d638 1369
1c5bd76d 1370 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
e71708d4
TM		 1371 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1372 continue;
e755d638 1373 /* If we are sending layoutreturn, invalidate all valid lsegs */
1c5bd76d
TM		 1374 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1375 continue;
1376 /*
1377 * Note: mark lseg for return so pnfs_layout_remove_lseg
1378 * doesn't invalidate the layout for us.
1379 */
1380 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1381 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1382 continue;
1383 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
69820d22
TM		 1384 }
1385
1c5bd76d
TM		 1386 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1387 goto out_noroc;
69820d22 1388
500d701f 1389 /* ROC in two conditions:
e755d638
PT		 1390 * 1. there are ROC lsegs
1391 * 2. we don't send layoutreturn
e755d638 1392 */
1c5bd76d
TM		 1393 /* lo ref dropped in pnfs_roc_release() */
1394 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1395 /* If the creds don't match, we can't compound the layoutreturn */
1396 if (!layoutreturn || cred != lo->plh_lc_cred)
1397 goto out_noroc;
1398
1399 roc = layoutreturn;
1400 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1401 res->lrs_present = 0;
1402 layoutreturn = false;
f7e8917a 1403
40dd4b7a 1404out_noroc:
f7e8917a 1405 spin_unlock(&ino->i_lock);
e755d638 1406 pnfs_layoutcommit_inode(ino, true);
287bd3e9
TM		 1407 if (roc) {
1408 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1409 if (ld->prepare_layoutreturn)
1410 ld->prepare_layoutreturn(args);
9c6376eb 1411 pnfs_put_layout_hdr(lo);
287bd3e9
TM		 1412 return true;
1413 }
e755d638 1414 if (layoutreturn)
1c5bd76d 1415 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
9c6376eb 1416 pnfs_put_layout_hdr(lo);
287bd3e9 1417 return false;
f7e8917a
FI		 1418}
1419
1c5bd76d
TM		 1420void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1421 struct nfs4_layoutreturn_res *res,
1422 int ret)
f7e8917a 1423{
1c5bd76d
TM		 1424 struct pnfs_layout_hdr *lo = args->layout;
1425 const nfs4_stateid *arg_stateid = NULL;
1426 const nfs4_stateid *res_stateid = NULL;
287bd3e9 1427 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
f7e8917a 1428
1c5bd76d
TM		 1429 if (ret == 0) {
1430 arg_stateid = &args->stateid;
1431 if (res->lrs_present)
1432 res_stateid = &res->stateid;
1433 }
1434 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1435 res_stateid);
287bd3e9
TM		 1436 if (ld_private && ld_private->ops && ld_private->ops->free)
1437 ld_private->ops->free(ld_private);
1c5bd76d
TM		 1438 pnfs_put_layout_hdr(lo);
1439 trace_nfs4_layoutreturn_on_close(args->inode, 0);
f7e8917a
FI		 1440}
1441
500d701f
PT		 1442bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1443{
1444 struct nfs_inode *nfsi = NFS_I(ino);
1445 struct pnfs_layout_hdr *lo;
1446 bool sleep = false;
1447
1448 /* we might not have grabbed lo reference. so need to check under
1449 * i_lock */
1450 spin_lock(&ino->i_lock);
1451 lo = nfsi->layout;
ee284e35
TM		 1452 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1453 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
500d701f 1454 sleep = true;
ee284e35 1455 }
500d701f 1456 spin_unlock(&ino->i_lock);
500d701f
PT		 1457 return sleep;
1458}
1459
b1f69b75
AA		 1460/*
1461 * Compare two layout segments for sorting into layout cache.
1462 * We want to preferentially return RW over RO layouts, so ensure those
1463 * are seen first.
1464 */
1465static s64
7dc0ac70 1466pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
3cb2df17 1467 const struct pnfs_layout_range *l2)
b1f69b75 1468{
fb3296eb
BH		 1469 s64 d;
1470
1471 /* high offset > low offset */
1472 d = l1->offset - l2->offset;
1473 if (d)
1474 return d;
1475
1476 /* short length > long length */
1477 d = l2->length - l1->length;
1478 if (d)
1479 return d;
1480
b1f69b75 1481 /* read > read/write */
fb3296eb 1482 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
b1f69b75
AA		 1483}
1484
03772d2f
TM		 1485static bool
1486pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1487 const struct pnfs_layout_range *l2)
1488{
1489 return pnfs_lseg_range_cmp(l1, l2) > 0;
1490}
1491
1492static bool
1493pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1494 struct pnfs_layout_segment *old)
1495{
1496 return false;
1497}
1498
1499void
1500pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1501 struct pnfs_layout_segment *lseg,
1502 bool (*is_after)(const struct pnfs_layout_range *,
1503 const struct pnfs_layout_range *),
1504 bool (*do_merge)(struct pnfs_layout_segment *,
1505 struct pnfs_layout_segment *),
1506 struct list_head *free_me)
974cec8c 1507{
03772d2f 1508 struct pnfs_layout_segment *lp, *tmp;
b1f69b75 1509
974cec8c
AA		 1510 dprintk("%s:Begin\n", __func__);
1511
03772d2f
TM		 1512 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1513 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1514 continue;
1515 if (do_merge(lseg, lp)) {
1516 mark_lseg_invalid(lp, free_me);
1517 continue;
1518 }
1519 if (is_after(&lseg->pls_range, &lp->pls_range))
b1f69b75 1520 continue;
566052c5 1521 list_add_tail(&lseg->pls_list, &lp->pls_list);
b1f69b75
AA		 1522 dprintk("%s: inserted lseg %p "
1523 "iomode %d offset %llu length %llu before "
1524 "lp %p iomode %d offset %llu length %llu\n",
566052c5
FI		 1525 __func__, lseg, lseg->pls_range.iomode,
1526 lseg->pls_range.offset, lseg->pls_range.length,
1527 lp, lp->pls_range.iomode, lp->pls_range.offset,
1528 lp->pls_range.length);
fb3296eb 1529 goto out;
974cec8c 1530 }
fb3296eb
BH		 1531 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1532 dprintk("%s: inserted lseg %p "
1533 "iomode %d offset %llu length %llu at tail\n",
1534 __func__, lseg, lseg->pls_range.iomode,
1535 lseg->pls_range.offset, lseg->pls_range.length);
1536out:
70c3bd2b 1537 pnfs_get_layout_hdr(lo);
974cec8c
AA		 1538
1539 dprintk("%s:Return\n", __func__);
e5e94017 1540}
03772d2f
TM		 1541EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1542
1543static void
1544pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1545 struct pnfs_layout_segment *lseg,
1546 struct list_head *free_me)
1547{
1548 struct inode *inode = lo->plh_inode;
1549 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1550
1551 if (ld->add_lseg != NULL)
1552 ld->add_lseg(lo, lseg, free_me);
1553 else
1554 pnfs_generic_layout_insert_lseg(lo, lseg,
1555 pnfs_lseg_range_is_after,
1556 pnfs_lseg_no_merge,
1557 free_me);
1558}
e5e94017
BH		 1559
1560static struct pnfs_layout_hdr *
9fa40758
PT		 1561alloc_init_layout_hdr(struct inode *ino,
1562 struct nfs_open_context *ctx,
1563 gfp_t gfp_flags)
e5e94017
BH		 1564{
1565 struct pnfs_layout_hdr *lo;
1566
636fb9c8 1567 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
e5e94017
BH		 1568 if (!lo)
1569 return NULL;
2b28a7be 1570 refcount_set(&lo->plh_refcount, 1);
b7edfaa1
FI		 1571 INIT_LIST_HEAD(&lo->plh_layouts);
1572 INIT_LIST_HEAD(&lo->plh_segs);
68f74479 1573 INIT_LIST_HEAD(&lo->plh_return_segs);
fd9a8d71 1574 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
b7edfaa1 1575 lo->plh_inode = ino;
5cc2216d 1576 lo->plh_lc_cred = get_rpccred(ctx->cred);
67a3b721 1577 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
e5e94017
BH		 1578 return lo;
1579}
1580
1581static struct pnfs_layout_hdr *
9fa40758
PT		 1582pnfs_find_alloc_layout(struct inode *ino,
1583 struct nfs_open_context *ctx,
1584 gfp_t gfp_flags)
e5241e43
TM		 1585 __releases(&ino->i_lock)
1586 __acquires(&ino->i_lock)
e5e94017
BH		 1587{
1588 struct nfs_inode *nfsi = NFS_I(ino);
1589 struct pnfs_layout_hdr *new = NULL;
1590
1591 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1592
251ec410
TM		 1593 if (nfsi->layout != NULL)
1594 goto out_existing;
e5e94017 1595 spin_unlock(&ino->i_lock);
9fa40758 1596 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
e5e94017
BH		 1597 spin_lock(&ino->i_lock);
1598
251ec410 1599 if (likely(nfsi->layout == NULL)) { /* Won the race? */
e5e94017 1600 nfsi->layout = new;
251ec410 1601 return new;
7175fe90
YN		 1602 } else if (new != NULL)
1603 pnfs_free_layout_hdr(new);
251ec410
TM		 1604out_existing:
1605 pnfs_get_layout_hdr(nfsi->layout);
e5e94017
BH		 1606 return nfsi->layout;
1607}
1608
b1f69b75
AA		 1609/*
1610 * iomode matching rules:
c7d73af2
TH		 1611 * iomode lseg strict match
1612 * iomode
1613 * ----- ----- ------ -----
1614 * ANY READ N/A true
1615 * ANY RW N/A true
1616 * RW READ N/A false
1617 * RW RW N/A true
1618 * READ READ N/A true
1619 * READ RW true false
1620 * READ RW false true
b1f69b75 1621 */
3cb2df17 1622static bool
7dc0ac70 1623pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
c7d73af2
TH		 1624 const struct pnfs_layout_range *range,
1625 bool strict_iomode)
b1f69b75 1626{
fb3296eb
BH		 1627 struct pnfs_layout_range range1;
1628
1629 if ((range->iomode == IOMODE_RW &&
1630 ls_range->iomode != IOMODE_RW) ||
c7d73af2 1631 (range->iomode != ls_range->iomode &&
6089dd0d 1632 strict_iomode) ||
7dc0ac70 1633 !pnfs_lseg_range_intersecting(ls_range, range))
10db5b7a 1634 return false;
fb3296eb
BH		 1635
1636 /* range1 covers only the first byte in the range */
1637 range1 = *range;
1638 range1.length = 1;
7dc0ac70 1639 return pnfs_lseg_range_contained(ls_range, &range1);
b1f69b75
AA		 1640}
1641
1642/*
1643 * lookup range in layout
1644 */
e5e94017 1645static struct pnfs_layout_segment *
fb3296eb 1646pnfs_find_lseg(struct pnfs_layout_hdr *lo,
c7d73af2
TH		 1647 struct pnfs_layout_range *range,
1648 bool strict_iomode)
e5e94017 1649{
b1f69b75
AA		 1650 struct pnfs_layout_segment *lseg, *ret = NULL;
1651
1652 dprintk("%s:Begin\n", __func__);
1653
b7edfaa1 1654 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
4541d16c 1655 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
c7d73af2
TH		 1656 pnfs_lseg_range_match(&lseg->pls_range, range,
1657 strict_iomode)) {
9369a431 1658 ret = pnfs_get_lseg(lseg);
b1f69b75
AA		 1659 break;
1660 }
b1f69b75
AA		 1661 }
1662
1663 dprintk("%s:Return lseg %p ref %d\n",
eba6dd69 1664 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
b1f69b75 1665 return ret;
e5e94017
BH		 1666}
1667
d23d61c8
AA		 1668/*
1669 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1670 * to the MDS or over pNFS
1671 *
1672 * The nfs_inode read_io and write_io fields are cumulative counters reset
1673 * when there are no layout segments. Note that in pnfs_update_layout iomode
1674 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1675 * WRITE request.
1676 *
1677 * A return of true means use MDS I/O.
1678 *
1679 * From rfc 5661:
1680 * If a file's size is smaller than the file size threshold, data accesses
1681 * SHOULD be sent to the metadata server. If an I/O request has a length that
1682 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1683 * server. If both file size and I/O size are provided, the client SHOULD
1684 * reach or exceed both thresholds before sending its read or write
1685 * requests to the data server.
1686 */
1687static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1688 struct inode *ino, int iomode)
1689{
1690 struct nfs4_threshold *t = ctx->mdsthreshold;
1691 struct nfs_inode *nfsi = NFS_I(ino);
1692 loff_t fsize = i_size_read(ino);
1693 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1694
1695 if (t == NULL)
1696 return ret;
1697
1698 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1699 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1700
1701 switch (iomode) {
1702 case IOMODE_READ:
1703 if (t->bm & THRESHOLD_RD) {
1704 dprintk("%s fsize %llu\n", __func__, fsize);
1705 size_set = true;
1706 if (fsize < t->rd_sz)
1707 size = true;
1708 }
1709 if (t->bm & THRESHOLD_RD_IO) {
1710 dprintk("%s nfsi->read_io %llu\n", __func__,
1711 nfsi->read_io);
1712 io_set = true;
1713 if (nfsi->read_io < t->rd_io_sz)
1714 io = true;
1715 }
1716 break;
1717 case IOMODE_RW:
1718 if (t->bm & THRESHOLD_WR) {
1719 dprintk("%s fsize %llu\n", __func__, fsize);
1720 size_set = true;
1721 if (fsize < t->wr_sz)
1722 size = true;
1723 }
1724 if (t->bm & THRESHOLD_WR_IO) {
1725 dprintk("%s nfsi->write_io %llu\n", __func__,
1726 nfsi->write_io);
1727 io_set = true;
1728 if (nfsi->write_io < t->wr_io_sz)
1729 io = true;
1730 }
1731 break;
1732 }
1733 if (size_set && io_set) {
1734 if (size && io)
1735 ret = true;
1736 } else if (size || io)
1737 ret = true;
1738
1739 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1740 return ret;
1741}
1742
aa8a45ee
PT		 1743static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1744{
1745 /*
1746 * send layoutcommit as it can hold up layoutreturn due to lseg
1747 * reference
1748 */
1749 pnfs_layoutcommit_inode(lo->plh_inode, false);
1750 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
2e5b29f0 1751 nfs_wait_bit_killable,
aa8a45ee
PT		 1752 TASK_UNINTERRUPTIBLE);
1753}
1754
411ae722
TM		 1755static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1756{
1757 atomic_inc(&lo->plh_outstanding);
1758}
1759
1760static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1761{
1762 if (atomic_dec_and_test(&lo->plh_outstanding))
1763 wake_up_var(&lo->plh_outstanding);
1764}
1765
d67ae825
TH		 1766static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1767{
1768 unsigned long *bitlock = &lo->plh_flags;
1769
1770 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1771 smp_mb__after_atomic();
1772 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1773}
1774
78746a38
FI		 1775static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1776 struct nfs_server *server)
1777{
1778 if (list_empty(&lo->plh_layouts)) {
1779 struct nfs_client *clp = server->nfs_client;
1780
1781 /* The lo must be on the clp list if there is any
1782 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1783 */
1784 spin_lock(&clp->cl_lock);
1785 if (list_empty(&lo->plh_layouts))
1786 list_add_tail(&lo->plh_layouts, &server->layouts);
1787 spin_unlock(&clp->cl_lock);
1788 }
1789}
1790
e5e94017
BH		 1791/*
1792 * Layout segment is retreived from the server if not cached.
1793 * The appropriate layout segment is referenced and returned to the caller.
1794 */
7c24d948 1795struct pnfs_layout_segment *
e5e94017
BH		 1796pnfs_update_layout(struct inode *ino,
1797 struct nfs_open_context *ctx,
fb3296eb
BH		 1798 loff_t pos,
1799 u64 count,
a75b9df9 1800 enum pnfs_iomode iomode,
c7d73af2 1801 bool strict_iomode,
a75b9df9 1802 gfp_t gfp_flags)
e5e94017 1803{
fb3296eb
BH		 1804 struct pnfs_layout_range arg = {
1805 .iomode = iomode,
1806 .offset = pos,
1807 .length = count,
1808 };
70d2f7b1 1809 unsigned pg_offset;
6382a441
WAA		 1810 struct nfs_server *server = NFS_SERVER(ino);
1811 struct nfs_client *clp = server->nfs_client;
183d9e7b 1812 struct pnfs_layout_hdr *lo = NULL;
e5e94017 1813 struct pnfs_layout_segment *lseg = NULL;
587f03de 1814 struct nfs4_layoutget *lgp;
183d9e7b
JL		 1815 nfs4_stateid stateid;
1816 long timeout = 0;
66b53f32 1817 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
30005121 1818 bool first;
e5e94017 1819
9a4bf31d 1820 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
183d9e7b 1821 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1822 PNFS_UPDATE_LAYOUT_NO_PNFS);
f86bbcf8 1823 goto out;
9a4bf31d 1824 }
d23d61c8 1825
9a4bf31d 1826 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
183d9e7b 1827 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1828 PNFS_UPDATE_LAYOUT_MDSTHRESH);
f86bbcf8 1829 goto out;
9a4bf31d 1830 }
d23d61c8 1831
9bf87482 1832lookup_again:
b88fa69e 1833 nfs4_client_recover_expired_lease(clp);
9bf87482 1834 first = false;
e5e94017 1835 spin_lock(&ino->i_lock);
9fa40758 1836 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
830ffb56
TM		 1837 if (lo == NULL) {
1838 spin_unlock(&ino->i_lock);
183d9e7b 1839 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1840 PNFS_UPDATE_LAYOUT_NOMEM);
830ffb56
TM		 1841 goto out;
1842 }
e5e94017 1843
43f1b3da 1844 /* Do we even need to bother with this? */
a59c30ac 1845 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
183d9e7b 1846 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1847 PNFS_UPDATE_LAYOUT_BULK_RECALL);
43f1b3da 1848 dprintk("%s matches recall, use MDS\n", __func__);
e5e94017
BH		 1849 goto out_unlock;
1850 }
1851
1852 /* if LAYOUTGET already failed once we don't try again */
2e5b29f0 1853 if (pnfs_layout_io_test_failed(lo, iomode)) {
183d9e7b 1854 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1855 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
e5e94017 1856 goto out_unlock;
9a4bf31d 1857 }
e5e94017 1858
411ae722
TM		 1859 /*
1860 * If the layout segment list is empty, but there are outstanding
1861 * layoutget calls, then they might be subject to a layoutrecall.
1862 */
1863 if (list_empty(&lo->plh_segs) &&
1864 atomic_read(&lo->plh_outstanding) != 0) {
1865 spin_unlock(&ino->i_lock);
1866 if (wait_var_event_killable(&lo->plh_outstanding,
1867 atomic_read(&lo->plh_outstanding) == 0
1868 || !list_empty(&lo->plh_segs)))
1869 goto out_put_layout_hdr;
1870 pnfs_put_layout_hdr(lo);
1871 goto lookup_again;
1872 }
1873
c7d73af2 1874 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
183d9e7b
JL		 1875 if (lseg) {
1876 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1877 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1878 goto out_unlock;
1879 }
1880
1881 if (!nfs4_valid_open_stateid(ctx->state)) {
1882 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1883 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1884 goto out_unlock;
1885 }
1886
1887 /*
1888 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1889 * stateid, or it has been invalidated, then we must use the open
1890 * stateid.
1891 */
67a3b721 1892 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
183d9e7b
JL		 1893
1894 /*
1895 * The first layoutget for the file. Need to serialize per
9bf87482
PT		 1896 * RFC 5661 Errata 3208.
1897 */
1898 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1899 &lo->plh_flags)) {
1900 spin_unlock(&ino->i_lock);
1901 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1902 TASK_UNINTERRUPTIBLE);
1903 pnfs_put_layout_hdr(lo);
183d9e7b 1904 dprintk("%s retrying\n", __func__);
9bf87482
PT		 1905 goto lookup_again;
1906 }
183d9e7b
JL		 1907
1908 first = true;
70d2f7b1
TM		 1909 if (nfs4_select_rw_stateid(ctx->state,
1910 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
1911 NULL, &stateid, NULL) != 0) {
1912 trace_pnfs_update_layout(ino, pos, count,
1913 iomode, lo, lseg,
1914 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1915 goto out_unlock;
1916 }
9bf87482 1917 } else {
183d9e7b 1918 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
9bf87482 1919 }
568e8c49 1920
aa8a45ee
PT		 1921 /*
1922 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1923 * for LAYOUTRETURN even if first is true.
1924 */
8f70f53a 1925 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
aa8a45ee
PT		 1926 spin_unlock(&ino->i_lock);
1927 dprintk("%s wait for layoutreturn\n", __func__);
1928 if (pnfs_prepare_to_retry_layoutget(lo)) {
d67ae825
TH		 1929 if (first)
1930 pnfs_clear_first_layoutget(lo);
aa8a45ee
PT		 1931 pnfs_put_layout_hdr(lo);
1932 dprintk("%s retrying\n", __func__);
183d9e7b
JL		 1933 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1934 lseg, PNFS_UPDATE_LAYOUT_RETRY);
aa8a45ee
PT		 1935 goto lookup_again;
1936 }
183d9e7b 1937 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1938 PNFS_UPDATE_LAYOUT_RETURN);
aa8a45ee
PT		 1939 goto out_put_layout_hdr;
1940 }
1941
9a4bf31d 1942 if (pnfs_layoutgets_blocked(lo)) {
183d9e7b 1943 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1944 PNFS_UPDATE_LAYOUT_BLOCKED);
cf7d63f1 1945 goto out_unlock;
9a4bf31d 1946 }
411ae722 1947 nfs_layoutget_begin(lo);
f49f9baa 1948 spin_unlock(&ino->i_lock);
30005121 1949
78746a38 1950 _add_to_server_list(lo, server);
e5e94017 1951
09cbfeaf 1952 pg_offset = arg.offset & ~PAGE_MASK;
707ed5fd
BH		 1953 if (pg_offset) {
1954 arg.offset -= pg_offset;
1955 arg.length += pg_offset;
1956 }
7c24d948 1957 if (arg.length != NFS4_MAX_UINT64)
09cbfeaf 1958 arg.length = PAGE_ALIGN(arg.length);
707ed5fd 1959
5e36e2a9 1960 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
587f03de
FI		 1961 if (!lgp) {
1962 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
1963 PNFS_UPDATE_LAYOUT_NOMEM);
411ae722 1964 nfs_layoutget_end(lo);
587f03de
FI		 1965 goto out_put_layout_hdr;
1966 }
1967
dacb452d 1968 lseg = nfs4_proc_layoutget(lgp, &timeout);
183d9e7b
JL		 1969 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1970 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
411ae722 1971 nfs_layoutget_end(lo);
83026d80 1972 if (IS_ERR(lseg)) {
183d9e7b 1973 switch(PTR_ERR(lseg)) {
e85d7ee4 1974 case -EBUSY:
183d9e7b
JL		 1975 if (time_after(jiffies, giveup))
1976 lseg = NULL;
66b53f32
TM		 1977 break;
1978 case -ERECALLCONFLICT:
183d9e7b 1979 case -EAGAIN:
56b38a1f 1980 break;
183d9e7b
JL		 1981 default:
1982 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
1983 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1984 lseg = NULL;
1985 }
56b38a1f
TM		 1986 goto out_put_layout_hdr;
1987 }
1988 if (lseg) {
1989 if (first)
1990 pnfs_clear_first_layoutget(lo);
1991 trace_pnfs_update_layout(ino, pos, count,
1992 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
1993 pnfs_put_layout_hdr(lo);
1994 goto lookup_again;
83026d80
JL		 1995 }
1996 } else {
1997 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1998 }
1999
830ffb56 2000out_put_layout_hdr:
d67ae825
TH		 2001 if (first)
2002 pnfs_clear_first_layoutget(lo);
70c3bd2b 2003 pnfs_put_layout_hdr(lo);
e5e94017 2004out:
f86bbcf8
TM		 2005 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2006 "(%s, offset: %llu, length: %llu)\n",
2007 __func__, ino->i_sb->s_id,
2008 (unsigned long long)NFS_FILEID(ino),
d600ad1f 2009 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
f86bbcf8
TM		 2010 iomode==IOMODE_RW ? "read/write" : "read-only",
2011 (unsigned long long)pos,
2012 (unsigned long long)count);
e5e94017
BH		 2013 return lseg;
2014out_unlock:
2015 spin_unlock(&ino->i_lock);
830ffb56 2016 goto out_put_layout_hdr;
e5e94017 2017}
7c24d948 2018EXPORT_SYMBOL_GPL(pnfs_update_layout);
b1f69b75 2019
540d9864
TM		 2020static bool
2021pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2022{
2023 switch (range->iomode) {
2024 case IOMODE_READ:
2025 case IOMODE_RW:
2026 break;
2027 default:
2028 return false;
2029 }
2030 if (range->offset == NFS4_MAX_UINT64)
2031 return false;
2032 if (range->length == 0)
2033 return false;
2034 if (range->length != NFS4_MAX_UINT64 &&
2035 range->length > NFS4_MAX_UINT64 - range->offset)
2036 return false;
2037 return true;
2038}
2039
78746a38
FI		 2040static struct pnfs_layout_hdr *
2041_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2042{
2043 struct pnfs_layout_hdr *lo;
2044
2045 spin_lock(&ino->i_lock);
2046 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2047 if (!lo)
2048 goto out_unlock;
2049 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2050 goto out_unlock;
2051 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2052 goto out_unlock;
2053 if (pnfs_layoutgets_blocked(lo))
2054 goto out_unlock;
2055 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2056 goto out_unlock;
411ae722 2057 nfs_layoutget_begin(lo);
78746a38
FI		 2058 spin_unlock(&ino->i_lock);
2059 _add_to_server_list(lo, NFS_SERVER(ino));
2060 return lo;
2061
2062out_unlock:
2063 spin_unlock(&ino->i_lock);
2064 pnfs_put_layout_hdr(lo);
2065 return NULL;
2066}
2067
2409a976
FI		 2068extern const nfs4_stateid current_stateid;
2069
2070static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2071 struct nfs_open_context *ctx)
2072{
78746a38
FI		 2073 struct inode *ino = data->dentry->d_inode;
2074 struct pnfs_layout_range rng = {
2075 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2076 IOMODE_RW: IOMODE_READ,
2077 .offset = 0,
2078 .length = NFS4_MAX_UINT64,
2079 };
2080 struct nfs4_layoutget *lgp;
2081 struct pnfs_layout_hdr *lo;
2082
64294b08
TM		 2083 /* Heuristic: don't send layoutget if we have cached data */
2084 if (rng.iomode == IOMODE_READ &&
2085 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2086 return;
2087
78746a38
FI		 2088 lo = _pnfs_grab_empty_layout(ino, ctx);
2089 if (!lo)
2090 return;
2091 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &current_stateid,
2092 &rng, GFP_KERNEL);
2093 if (!lgp) {
2094 pnfs_clear_first_layoutget(lo);
2095 pnfs_put_layout_hdr(lo);
2096 return;
2097 }
2098 data->lgp = lgp;
2099 data->o_arg.lg_args = &lgp->args;
2100 data->o_res.lg_res = &lgp->res;
2409a976
FI		 2101}
2102
2103static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2104 struct nfs_open_context *ctx)
2105{
2106 struct pnfs_layout_range rng = {
2107 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2108 IOMODE_RW: IOMODE_READ,
2109 .offset = 0,
2110 .length = NFS4_MAX_UINT64,
2111 };
2112 struct nfs4_layoutget *lgp;
2113
2114 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, &current_stateid,
2115 &rng, GFP_KERNEL);
2116 if (!lgp)
2117 return;
2118 data->lgp = lgp;
2119 data->o_arg.lg_args = &lgp->args;
2120 data->o_res.lg_res = &lgp->res;
2121}
2122
2123void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2124 struct nfs_open_context *ctx)
2125{
2126 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2127
2128 if (!(pnfs_enabled_sb(server) &&
2129 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2130 return;
2131 /* Could check on max_ops, but currently hardcoded high enough */
6e01260c
FI		 2132 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2133 return;
2409a976
FI		 2134 if (data->state)
2135 _lgopen_prepare_attached(data, ctx);
2136 else
2137 _lgopen_prepare_floating(data, ctx);
2138}
2139
2140void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2141 struct nfs_open_context *ctx)
2142{
2143 struct pnfs_layout_hdr *lo;
2144 struct pnfs_layout_segment *lseg;
c49b5209 2145 struct nfs_server *srv = NFS_SERVER(ino);
2409a976
FI		 2146 u32 iomode;
2147
6e01260c 2148 if (!lgp)
2409a976 2149 return;
6e01260c
FI		 2150 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2151 if (lgp->res.status) {
2152 switch (lgp->res.status) {
6e01260c 2153 default:
8dc96566
TM		 2154 break;
2155 /*
2156 * Halt lgopen attempts if the server doesn't recognise
2157 * the "current stateid" value, the layout type, or the
2158 * layoutget operation as being valid.
2159 * Also if it complains about too many ops in the compound
2160 * or of the request/reply being too big.
2161 */
2162 case -NFS4ERR_BAD_STATEID:
2163 case -NFS4ERR_NOTSUPP:
2164 case -NFS4ERR_REP_TOO_BIG:
2165 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2166 case -NFS4ERR_REQ_TOO_BIG:
2167 case -NFS4ERR_TOO_MANY_OPS:
2168 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
c49b5209 2169 srv->caps &= ~NFS_CAP_LGOPEN;
6e01260c
FI		 2170 }
2171 return;
2172 }
2409a976 2173 if (!lgp->args.inode) {
78746a38
FI		 2174 lo = _pnfs_grab_empty_layout(ino, ctx);
2175 if (!lo)
2176 return;
2409a976
FI		 2177 lgp->args.inode = ino;
2178 } else
2179 lo = NFS_I(lgp->args.inode)->layout;
2409a976
FI		 2180
2181 lseg = pnfs_layout_process(lgp);
32f1c28f 2182 if (!IS_ERR(lseg)) {
2409a976
FI		 2183 iomode = lgp->args.range.iomode;
2184 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2185 pnfs_put_lseg(lseg);
2186 }
30ae2412
FI		 2187}
2188
2189void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2190{
2191 if (lgp != NULL) {
2192 struct inode *inode = lgp->args.inode;
2193 if (inode) {
2194 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
30ae2412 2195 pnfs_clear_first_layoutget(lo);
411ae722 2196 nfs_layoutget_end(lo);
30ae2412
FI		 2197 }
2198 pnfs_layoutget_free(lgp);
2199 }
2409a976
FI		 2200}
2201
a0b0a6e3 2202struct pnfs_layout_segment *
b1f69b75
AA		 2203pnfs_layout_process(struct nfs4_layoutget *lgp)
2204{
2205 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
2206 struct nfs4_layoutget_res *res = &lgp->res;
2207 struct pnfs_layout_segment *lseg;
b7edfaa1 2208 struct inode *ino = lo->plh_inode;
78096cca 2209 LIST_HEAD(free_me);
540d9864
TM		 2210
2211 if (!pnfs_sanity_check_layout_range(&res->range))
1b3c6d07 2212 return ERR_PTR(-EINVAL);
b1f69b75
AA		 2213
2214 /* Inject layout blob into I/O device driver */
a75b9df9 2215 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1b3c6d07 2216 if (IS_ERR_OR_NULL(lseg)) {
b1f69b75 2217 if (!lseg)
1b3c6d07
JL		 2218 lseg = ERR_PTR(-ENOMEM);
2219
2220 dprintk("%s: Could not allocate layout: error %ld\n",
2221 __func__, PTR_ERR(lseg));
2222 return lseg;
b1f69b75
AA		 2223 }
2224
119cef97 2225 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
1013df61 2226
b1f69b75 2227 spin_lock(&ino->i_lock);
e1c06f80 2228 if (pnfs_layoutgets_blocked(lo)) {
43f1b3da 2229 dprintk("%s forget reply due to state\n", __func__);
1b3c6d07 2230 goto out_forget;
43f1b3da 2231 }
038d6493 2232
9888d837
TM		 2233 if (!pnfs_layout_is_valid(lo)) {
2234 /* We have a completely new layout */
2235 pnfs_set_layout_stateid(lo, &res->stateid, true);
2236 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
362f7474
CH		 2237 /* existing state ID, make sure the sequence number matches. */
2238 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2239 dprintk("%s forget reply due to sequence\n", __func__);
1b3c6d07 2240 goto out_forget;
362f7474
CH		 2241 }
2242 pnfs_set_layout_stateid(lo, &res->stateid, false);
2243 } else {
2244 /*
2245 * We got an entirely new state ID. Mark all segments for the
9888d837 2246 * inode invalid, and retry the layoutget
362f7474 2247 */
d9b61708 2248 pnfs_mark_layout_stateid_invalid(lo, &free_me);
9888d837 2249 goto out_forget;
362f7474 2250 }
038d6493 2251
9369a431 2252 pnfs_get_lseg(lseg);
03772d2f 2253 pnfs_layout_insert_lseg(lo, lseg, &free_me);
8e0acf90 2254
b1f69b75 2255
3976143b 2256 if (res->return_on_close)
f7e8917a 2257 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
f7e8917a 2258
b1f69b75 2259 spin_unlock(&ino->i_lock);
78096cca 2260 pnfs_free_lseg_list(&free_me);
a0b0a6e3 2261 return lseg;
43f1b3da 2262
1b3c6d07 2263out_forget:
43f1b3da
FI		 2264 spin_unlock(&ino->i_lock);
2265 lseg->pls_layout = lo;
2266 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1b3c6d07 2267 return ERR_PTR(-EAGAIN);
b1f69b75
AA		 2268}
2269
e0b7d420
TM		 2270static int
2271mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg,
2272 struct list_head *tmp_list)
2273{
2274 if (!mark_lseg_invalid(lseg, tmp_list))
2275 return 0;
2276 pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg);
2277 return 1;
2278}
2279
2f215968
TM		 2280/**
2281 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2282 * @lo: pointer to layout header
2283 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2284 * @return_range: describe layout segment ranges to be returned
e0b7d420 2285 * @seq: stateid seqid to match
2f215968
TM		 2286 *
2287 * This function is mainly intended for use by layoutrecall. It attempts
2288 * to free the layout segment immediately, or else to mark it for return
2289 * as soon as its reference count drops to zero.
e0b7d420
TM		 2290 *
2291 * Returns
2292 * - 0: a layoutreturn needs to be scheduled.
2293 * - EBUSY: there are layout segment that are still in use.
2294 * - ENOENT: there are no layout segments that need to be returned.
2f215968 2295 */
10335556 2296int
016256df
PT		 2297pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2298 struct list_head *tmp_list,
6d597e17
JL		 2299 const struct pnfs_layout_range *return_range,
2300 u32 seq)
016256df
PT		 2301{
2302 struct pnfs_layout_segment *lseg, *next;
10335556 2303 int remaining = 0;
016256df
PT		 2304
2305 dprintk("%s:Begin lo %p\n", __func__, lo);
2306
fc7ff367 2307 assert_spin_locked(&lo->plh_inode->i_lock);
016256df
PT		 2308
2309 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
e036f464 2310 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
016256df
PT		 2311 dprintk("%s: marking lseg %p iomode %d "
2312 "offset %llu length %llu\n", __func__,
2313 lseg, lseg->pls_range.iomode,
2314 lseg->pls_range.offset,
2315 lseg->pls_range.length);
e0b7d420 2316 if (mark_lseg_invalid_or_return(lseg, tmp_list))
2f215968
TM		 2317 continue;
2318 remaining++;
016256df 2319 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
016256df 2320 }
6d597e17 2321
e0b7d420 2322 if (remaining) {
6d597e17 2323 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
e0b7d420
TM		 2324 return -EBUSY;
2325 }
6d597e17 2326
e0b7d420
TM		 2327 if (!list_empty(&lo->plh_return_segs)) {
2328 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2329 return 0;
2330 }
2331
2332 return -ENOENT;
016256df
PT		 2333}
2334
2335void pnfs_error_mark_layout_for_return(struct inode *inode,
2336 struct pnfs_layout_segment *lseg)
2337{
2338 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
016256df
PT		 2339 struct pnfs_layout_range range = {
2340 .iomode = lseg->pls_range.iomode,
2341 .offset = 0,
2342 .length = NFS4_MAX_UINT64,
2343 };
10335556 2344 bool return_now = false;
016256df
PT		 2345
2346 spin_lock(&inode->i_lock);
bdebfccd
TM		 2347 if (!pnfs_layout_is_valid(lo)) {
2348 spin_unlock(&inode->i_lock);
2349 return;
2350 }
2d6cf5ab 2351 pnfs_set_plh_return_info(lo, range.iomode, 0);
016256df
PT		 2352 /*
2353 * mark all matching lsegs so that we are sure to have no live
2354 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2355 * for how it works.
2356 */
e0b7d420 2357 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) {
10335556 2358 nfs4_stateid stateid;
e5fd1904 2359 enum pnfs_iomode iomode;
10335556 2360
e5fd1904 2361 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
10335556
TM		 2362 spin_unlock(&inode->i_lock);
2363 if (return_now)
2364 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2365 } else {
2366 spin_unlock(&inode->i_lock);
2367 nfs_commit_inode(inode, 0);
2368 }
016256df
PT		 2369}
2370EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2371
b3230e80
TM		 2372void
2373pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2374{
2375 if (pgio->pg_lseg == NULL ||
2376 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2377 return;
2378 pnfs_put_lseg(pgio->pg_lseg);
2379 pgio->pg_lseg = NULL;
2380}
2381EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2382
08cb5b0f
BC		 2383/*
2384 * Check for any intersection between the request and the pgio->pg_lseg,
2385 * and if none, put this pgio->pg_lseg away.
2386 */
2387static void
2388pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2389{
2390 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2391 pnfs_put_lseg(pgio->pg_lseg);
2392 pgio->pg_lseg = NULL;
2393 }
2394}
2395
d8007d4d
TM		 2396void
2397pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2398{
1fd937bd
PT		 2399 u64 rd_size = req->wb_bytes;
2400
b3230e80 2401 pnfs_generic_pg_check_layout(pgio);
08cb5b0f 2402 pnfs_generic_pg_check_range(pgio, req);
cb5d04bc
PT		 2403 if (pgio->pg_lseg == NULL) {
2404 if (pgio->pg_dreq == NULL)
2405 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2406 else
2407 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2408
2409 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2410 req->wb_context,
2411 req_offset(req),
2412 rd_size,
2413 IOMODE_READ,
c7d73af2 2414 false,
cb5d04bc 2415 GFP_KERNEL);
d600ad1f
PT		 2416 if (IS_ERR(pgio->pg_lseg)) {
2417 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2418 pgio->pg_lseg = NULL;
2419 return;
2420 }
cb5d04bc 2421 }
e885de1a
TM		 2422 /* If no lseg, fall back to read through mds */
2423 if (pgio->pg_lseg == NULL)
1f945357 2424 nfs_pageio_reset_read_mds(pgio);
e885de1a 2425
d8007d4d
TM		 2426}
2427EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2428
2429void
6296556f
PT		 2430pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2431 struct nfs_page *req, u64 wb_size)
d8007d4d 2432{
b3230e80 2433 pnfs_generic_pg_check_layout(pgio);
08cb5b0f 2434 pnfs_generic_pg_check_range(pgio, req);
d600ad1f 2435 if (pgio->pg_lseg == NULL) {
cb5d04bc
PT		 2436 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2437 req->wb_context,
2438 req_offset(req),
2439 wb_size,
2440 IOMODE_RW,
c7d73af2 2441 false,
cb5d04bc 2442 GFP_NOFS);
d600ad1f
PT		 2443 if (IS_ERR(pgio->pg_lseg)) {
2444 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2445 pgio->pg_lseg = NULL;
2446 return;
2447 }
2448 }
e885de1a
TM		 2449 /* If no lseg, fall back to write through mds */
2450 if (pgio->pg_lseg == NULL)
1f945357 2451 nfs_pageio_reset_write_mds(pgio);
d8007d4d
TM		 2452}
2453EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2454
180bb5ec
WAA		 2455void
2456pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2457{
2458 if (desc->pg_lseg) {
2459 pnfs_put_lseg(desc->pg_lseg);
2460 desc->pg_lseg = NULL;
2461 }
2462}
2463EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2464
b4fdac1a
WAA		 2465/*
2466 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2467 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2468 */
2469size_t
a7d42ddb
WAA		 2470pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2471 struct nfs_page *prev, struct nfs_page *req)
94ad1c80 2472{
0f9c429e 2473 unsigned int size;
c5e20cb7 2474 u64 seg_end, req_start, seg_left;
0f9c429e
WAA		 2475
2476 size = nfs_generic_pg_test(pgio, prev, req);
0f9c429e
WAA		 2477 if (!size)
2478 return 0;
94ad1c80 2479
19982ba8 2480 /*
c5e20cb7
WAA		 2481 * 'size' contains the number of bytes left in the current page (up
2482 * to the original size asked for in @req->wb_bytes).
2483 *
2484 * Calculate how many bytes are left in the layout segment
2485 * and if there are less bytes than 'size', return that instead.
19982ba8
TM		 2486 *
2487 * Please also note that 'end_offset' is actually the offset of the
2488 * first byte that lies outside the pnfs_layout_range. FIXME?
2489 *
2490 */
19b54848 2491 if (pgio->pg_lseg) {
17822b20 2492 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
c5e20cb7
WAA		 2493 pgio->pg_lseg->pls_range.length);
2494 req_start = req_offset(req);
08cb5b0f 2495
c5e20cb7 2496 /* start of request is past the last byte of this segment */
08cb5b0f 2497 if (req_start >= seg_end)
19b54848 2498 return 0;
c5e20cb7
WAA		 2499
2500 /* adjust 'size' iff there are fewer bytes left in the
2501 * segment than what nfs_generic_pg_test returned */
2502 seg_left = seg_end - req_start;
2503 if (seg_left < size)
2504 size = (unsigned int)seg_left;
19b54848 2505 }
0f9c429e 2506
19b54848 2507 return size;
94ad1c80 2508}
89a58e32 2509EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
94ad1c80 2510
53113ad3 2511int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
e2fecb21
TM		 2512{
2513 struct nfs_pageio_descriptor pgio;
e2fecb21
TM		 2514
2515 /* Resend all requests through the MDS */
53113ad3
WAA		 2516 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2517 hdr->completion_ops);
c7070113 2518 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
53113ad3 2519 return nfs_pageio_resend(&pgio, hdr);
e2fecb21 2520}
e7dd79af 2521EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
e2fecb21 2522
d45f60c6 2523static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1acbbb4e 2524{
cd841605
FI		 2525
2526 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2527 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1acbbb4e 2528 PNFS_LAYOUTRET_ON_ERROR) {
cd841605 2529 pnfs_return_layout(hdr->inode);
1acbbb4e 2530 }
6c75dc0d 2531 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
53113ad3 2532 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1acbbb4e
FI		 2533}
2534
d20581aa
BH		 2535/*
2536 * Called by non rpc-based layout drivers
2537 */
d45f60c6 2538void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
44b83799 2539{
f8417b48 2540 if (likely(!hdr->pnfs_error)) {
67af7611
TM		 2541 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2542 hdr->mds_offset + hdr->res.count);
d45f60c6 2543 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
f8417b48
KM		 2544 }
2545 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2546 if (unlikely(hdr->pnfs_error))
d45f60c6
WAA		 2547 pnfs_ld_handle_write_error(hdr);
2548 hdr->mds_ops->rpc_release(hdr);
44b83799 2549}
d20581aa 2550EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
44b83799 2551
dce81290
TM		 2552static void
2553pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
d45f60c6 2554 struct nfs_pgio_header *hdr)
dce81290 2555{
48d635f1 2556 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
a7d42ddb 2557
6c75dc0d 2558 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
a7d42ddb 2559 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
6c75dc0d 2560 nfs_pageio_reset_write_mds(desc);
a7d42ddb 2561 mirror->pg_recoalesce = 1;
6c75dc0d 2562 }
ba4a76f7 2563 hdr->completion_ops->completion(hdr);
dce81290
TM		 2564}
2565
2566static enum pnfs_try_status
d45f60c6 2567pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
dce81290
TM		 2568 const struct rpc_call_ops *call_ops,
2569 struct pnfs_layout_segment *lseg,
2570 int how)
0382b744 2571{
cd841605 2572 struct inode *inode = hdr->inode;
0382b744
AA		 2573 enum pnfs_try_status trypnfs;
2574 struct nfs_server *nfss = NFS_SERVER(inode);
2575
cd841605 2576 hdr->mds_ops = call_ops;
0382b744
AA		 2577
2578 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
d45f60c6
WAA		 2579 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2580 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
6c75dc0d 2581 if (trypnfs != PNFS_NOT_ATTEMPTED)
0382b744 2582 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
0382b744
AA		 2583 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2584 return trypnfs;
2585}
2586
dce81290 2587static void
7f714720
WAA		 2588pnfs_do_write(struct nfs_pageio_descriptor *desc,
2589 struct nfs_pgio_header *hdr, int how)
dce81290 2590{
dce81290
TM		 2591 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2592 struct pnfs_layout_segment *lseg = desc->pg_lseg;
7f714720 2593 enum pnfs_try_status trypnfs;
dce81290 2594
d45f60c6 2595 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
37f8aa16
TM		 2596 switch (trypnfs) {
2597 case PNFS_NOT_ATTEMPTED:
d45f60c6 2598 pnfs_write_through_mds(desc, hdr);
37f8aa16
TM		 2599 case PNFS_ATTEMPTED:
2600 break;
2601 case PNFS_TRY_AGAIN:
2602 /* cleanup hdr and prepare to redo pnfs */
2603 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2604 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2605 list_splice_init(&hdr->pages, &mirror->pg_list);
2606 mirror->pg_recoalesce = 1;
2607 }
2608 hdr->mds_ops->rpc_release(hdr);
2609 }
dce81290
TM		 2610}
2611
6c75dc0d
FI		 2612static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2613{
9369a431 2614 pnfs_put_lseg(hdr->lseg);
1e7f3a48 2615 nfs_pgio_header_free(hdr);
6c75dc0d
FI		 2616}
2617
dce81290
TM		 2618int
2619pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2620{
6c75dc0d 2621 struct nfs_pgio_header *hdr;
dce81290
TM		 2622 int ret;
2623
1e7f3a48
WAA		 2624 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2625 if (!hdr) {
2bff2288
PT		 2626 desc->pg_error = -ENOMEM;
2627 return desc->pg_error;
dce81290 2628 }
6c75dc0d 2629 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
180bb5ec 2630
9369a431 2631 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
ef2c488c 2632 ret = nfs_generic_pgio(desc, hdr);
180bb5ec 2633 if (!ret)
7f714720 2634 pnfs_do_write(desc, hdr, desc->pg_ioflags);
a7d42ddb 2635
6c75dc0d 2636 return ret;
dce81290
TM		 2637}
2638EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2639
53113ad3 2640int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
62e4a769
TM		 2641{
2642 struct nfs_pageio_descriptor pgio;
2643
1acbbb4e 2644 /* Resend all requests through the MDS */
53113ad3
WAA		 2645 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2646 return nfs_pageio_resend(&pgio, hdr);
1acbbb4e 2647}
e7dd79af 2648EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1acbbb4e 2649
d45f60c6 2650static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
1acbbb4e 2651{
cd841605
FI		 2652 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2653 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1acbbb4e 2654 PNFS_LAYOUTRET_ON_ERROR) {
cd841605 2655 pnfs_return_layout(hdr->inode);
1acbbb4e 2656 }
4db6e0b7 2657 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
53113ad3 2658 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
62e4a769
TM		 2659}
2660
d20581aa
BH		 2661/*
2662 * Called by non rpc-based layout drivers
2663 */
d45f60c6 2664void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
d20581aa 2665{
bfc505de 2666 if (likely(!hdr->pnfs_error))
d45f60c6 2667 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
f8417b48
KM		 2668 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2669 if (unlikely(hdr->pnfs_error))
d45f60c6
WAA		 2670 pnfs_ld_handle_read_error(hdr);
2671 hdr->mds_ops->rpc_release(hdr);
d20581aa
BH		 2672}
2673EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2674
493292dd
TM		 2675static void
2676pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
d45f60c6 2677 struct nfs_pgio_header *hdr)
493292dd 2678{
48d635f1 2679 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
a7d42ddb 2680
4db6e0b7 2681 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
a7d42ddb 2682 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
4db6e0b7 2683 nfs_pageio_reset_read_mds(desc);
a7d42ddb 2684 mirror->pg_recoalesce = 1;
4db6e0b7 2685 }
ba4a76f7 2686 hdr->completion_ops->completion(hdr);
493292dd
TM		 2687}
2688
64419a9b
AA		 2689/*
2690 * Call the appropriate parallel I/O subsystem read function.
2691 */
493292dd 2692static enum pnfs_try_status
d45f60c6 2693pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
493292dd
TM		 2694 const struct rpc_call_ops *call_ops,
2695 struct pnfs_layout_segment *lseg)
64419a9b 2696{
cd841605 2697 struct inode *inode = hdr->inode;
64419a9b
AA		 2698 struct nfs_server *nfss = NFS_SERVER(inode);
2699 enum pnfs_try_status trypnfs;
2700
cd841605 2701 hdr->mds_ops = call_ops;
64419a9b
AA		 2702
2703 dprintk("%s: Reading ino:%lu %u@%llu\n",
d45f60c6 2704 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
64419a9b 2705
d45f60c6 2706 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
4db6e0b7 2707 if (trypnfs != PNFS_NOT_ATTEMPTED)
64419a9b 2708 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
64419a9b
AA		 2709 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2710 return trypnfs;
2711}
863a3c6c 2712
ceb11e13 2713/* Resend all requests through pnfs. */
1b1bc66b 2714void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
ceb11e13
PT		 2715{
2716 struct nfs_pageio_descriptor pgio;
2717
1b1bc66b 2718 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
54e4a0df
TM		 2719 /* Prevent deadlocks with layoutreturn! */
2720 pnfs_put_lseg(hdr->lseg);
2721 hdr->lseg = NULL;
2722
1b1bc66b
WAA		 2723 nfs_pageio_init_read(&pgio, hdr->inode, false,
2724 hdr->completion_ops);
2725 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2726 }
ceb11e13
PT		 2727}
2728EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2729
493292dd 2730static void
7f714720 2731pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
493292dd 2732{
493292dd
TM		 2733 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2734 struct pnfs_layout_segment *lseg = desc->pg_lseg;
7f714720 2735 enum pnfs_try_status trypnfs;
493292dd 2736
d45f60c6 2737 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
6aeafd05
TM		 2738 switch (trypnfs) {
2739 case PNFS_NOT_ATTEMPTED:
d45f60c6 2740 pnfs_read_through_mds(desc, hdr);
6aeafd05
TM		 2741 case PNFS_ATTEMPTED:
2742 break;
2743 case PNFS_TRY_AGAIN:
2744 /* cleanup hdr and prepare to redo pnfs */
2745 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2746 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2747 list_splice_init(&hdr->pages, &mirror->pg_list);
2748 mirror->pg_recoalesce = 1;
2749 }
2750 hdr->mds_ops->rpc_release(hdr);
2751 }
493292dd
TM		 2752}
2753
4db6e0b7
FI		 2754static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2755{
9369a431 2756 pnfs_put_lseg(hdr->lseg);
1e7f3a48 2757 nfs_pgio_header_free(hdr);
4db6e0b7
FI		 2758}
2759
493292dd
TM		 2760int
2761pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2762{
4db6e0b7 2763 struct nfs_pgio_header *hdr;
493292dd
TM		 2764 int ret;
2765
1e7f3a48
WAA		 2766 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2767 if (!hdr) {
2bff2288
PT		 2768 desc->pg_error = -ENOMEM;
2769 return desc->pg_error;
493292dd 2770 }
4db6e0b7 2771 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
9369a431 2772 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
ef2c488c 2773 ret = nfs_generic_pgio(desc, hdr);
180bb5ec 2774 if (!ret)
7f714720 2775 pnfs_do_read(desc, hdr);
4db6e0b7 2776 return ret;
493292dd
TM		 2777}
2778EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2779
71244d9b
TM		 2780static void pnfs_clear_layoutcommitting(struct inode *inode)
2781{
2782 unsigned long *bitlock = &NFS_I(inode)->flags;
2783
2784 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
4e857c58 2785 smp_mb__after_atomic();
71244d9b
TM		 2786 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2787}
2788
863a3c6c 2789/*
a9bae566 2790 * There can be multiple RW segments.
863a3c6c 2791 */
a9bae566 2792static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
863a3c6c 2793{
a9bae566 2794 struct pnfs_layout_segment *lseg;
863a3c6c 2795
a9bae566
PT		 2796 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2797 if (lseg->pls_range.iomode == IOMODE_RW &&
a073dbff 2798 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
a9bae566
PT		 2799 list_add(&lseg->pls_lc_list, listp);
2800 }
863a3c6c
AA		 2801}
2802
a073dbff
TM		 2803static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2804{
2805 struct pnfs_layout_segment *lseg, *tmp;
a073dbff
TM		 2806
2807 /* Matched by references in pnfs_set_layoutcommit */
2808 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2809 list_del_init(&lseg->pls_lc_list);
2810 pnfs_put_lseg(lseg);
2811 }
2812
71244d9b 2813 pnfs_clear_layoutcommitting(inode);
a073dbff
TM		 2814}
2815
1b0ae068
PT		 2816void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2817{
b9e028fd 2818 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
1b0ae068
PT		 2819}
2820EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2821
863a3c6c 2822void
67af7611
TM		 2823pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2824 loff_t end_pos)
863a3c6c 2825{
cd841605 2826 struct nfs_inode *nfsi = NFS_I(inode);
79a48a1f 2827 bool mark_as_dirty = false;
863a3c6c 2828
cd841605 2829 spin_lock(&inode->i_lock);
863a3c6c 2830 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
29559b11 2831 nfsi->layout->plh_lwb = end_pos;
79a48a1f 2832 mark_as_dirty = true;
863a3c6c 2833 dprintk("%s: Set layoutcommit for inode %lu ",
cd841605 2834 __func__, inode->i_ino);
29559b11
TM		 2835 } else if (end_pos > nfsi->layout->plh_lwb)
2836 nfsi->layout->plh_lwb = end_pos;
67af7611 2837 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
a9bae566 2838 /* references matched in nfs4_layoutcommit_release */
67af7611 2839 pnfs_get_lseg(lseg);
a9bae566 2840 }
cd841605 2841 spin_unlock(&inode->i_lock);
acff5880 2842 dprintk("%s: lseg %p end_pos %llu\n",
67af7611 2843 __func__, lseg, nfsi->layout->plh_lwb);
79a48a1f
WAA		 2844
2845 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2846 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2847 if (mark_as_dirty)
cd841605 2848 mark_inode_dirty_sync(inode);
863a3c6c
AA		 2849}
2850EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2851
db29c089
AA		 2852void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2853{
2854 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2855
2856 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2857 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
a073dbff 2858 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
db29c089
AA		 2859}
2860
de4b15c7
AA		 2861/*
2862 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2863 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2864 * data to disk to allow the server to recover the data if it crashes.
2865 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2866 * is off, and a COMMIT is sent to a data server, or
2867 * if WRITEs to a data server return NFS_DATA_SYNC.
2868 */
863a3c6c 2869int
ef311537 2870pnfs_layoutcommit_inode(struct inode *inode, bool sync)
863a3c6c 2871{
5f919c9f 2872 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
863a3c6c
AA		 2873 struct nfs4_layoutcommit_data *data;
2874 struct nfs_inode *nfsi = NFS_I(inode);
863a3c6c 2875 loff_t end_pos;
71244d9b 2876 int status;
863a3c6c 2877
71244d9b 2878 if (!pnfs_layoutcommit_outstanding(inode))
de4b15c7
AA		 2879 return 0;
2880
71244d9b 2881 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
92407e75 2882
71244d9b 2883 status = -EAGAIN;
92407e75 2884 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
71244d9b
TM		 2885 if (!sync)
2886 goto out;
74316201 2887 status = wait_on_bit_lock_action(&nfsi->flags,
71244d9b
TM		 2888 NFS_INO_LAYOUTCOMMITTING,
2889 nfs_wait_bit_killable,
2890 TASK_KILLABLE);
92407e75 2891 if (status)
71244d9b 2892 goto out;
92407e75
PT		 2893 }
2894
71244d9b
TM		 2895 status = -ENOMEM;
2896 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2897 data = kzalloc(sizeof(*data), GFP_NOFS);
2898 if (!data)
2899 goto clear_layoutcommitting;
2900
2901 status = 0;
de4b15c7 2902 spin_lock(&inode->i_lock);
71244d9b
TM		 2903 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2904 goto out_unlock;
a9bae566 2905
71244d9b 2906 INIT_LIST_HEAD(&data->lseg_list);
a9bae566 2907 pnfs_list_write_lseg(inode, &data->lseg_list);
863a3c6c 2908
acff5880 2909 end_pos = nfsi->layout->plh_lwb;
863a3c6c 2910
f597c537 2911 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
863a3c6c
AA		 2912 spin_unlock(&inode->i_lock);
2913
2914 data->args.inode = inode;
9fa40758 2915 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
863a3c6c
AA		 2916 nfs_fattr_init(&data->fattr);
2917 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2918 data->res.fattr = &data->fattr;
2e18d4d8
TM		 2919 if (end_pos != 0)
2920 data->args.lastbytewritten = end_pos - 1;
2921 else
2922 data->args.lastbytewritten = U64_MAX;
863a3c6c
AA		 2923 data->res.server = NFS_SERVER(inode);
2924
5f919c9f
CH		 2925 if (ld->prepare_layoutcommit) {
2926 status = ld->prepare_layoutcommit(&data->args);
2927 if (status) {
3471648a 2928 put_rpccred(data->cred);
5f919c9f 2929 spin_lock(&inode->i_lock);
29559b11
TM		 2930 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2931 if (end_pos > nfsi->layout->plh_lwb)
5f919c9f 2932 nfsi->layout->plh_lwb = end_pos;
3471648a 2933 goto out_unlock;
5f919c9f
CH		 2934 }
2935 }
2936
2937
863a3c6c
AA		 2938 status = nfs4_proc_layoutcommit(data, sync);
2939out:
92407e75
PT		 2940 if (status)
2941 mark_inode_dirty_sync(inode);
863a3c6c
AA		 2942 dprintk("<-- %s status %d\n", __func__, status);
2943 return status;
71244d9b
TM		 2944out_unlock:
2945 spin_unlock(&inode->i_lock);
92407e75 2946 kfree(data);
71244d9b
TM		 2947clear_layoutcommitting:
2948 pnfs_clear_layoutcommitting(inode);
92407e75 2949 goto out;
863a3c6c 2950}
72cff449 2951EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
82be417a 2952
5bb89b47
TM		 2953int
2954pnfs_generic_sync(struct inode *inode, bool datasync)
2955{
2956 return pnfs_layoutcommit_inode(inode, true);
2957}
2958EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2959
82be417a
AA		 2960struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2961{
2962 struct nfs4_threshold *thp;
2963
2964 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2965 if (!thp) {
2966 dprintk("%s mdsthreshold allocation failed\n", __func__);
2967 return NULL;
2968 }
2969 return thp;
2970}
8733408d 2971
865a7ecb 2972#if IS_ENABLED(CONFIG_NFS_V4_2)
8733408d 2973int
c8ad8894 2974pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
8733408d
PT		 2975{
2976 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2977 struct nfs_server *server = NFS_SERVER(inode);
1bfe3b25 2978 struct nfs_inode *nfsi = NFS_I(inode);
8733408d
PT		 2979 struct nfs42_layoutstat_data *data;
2980 struct pnfs_layout_hdr *hdr;
2981 int status = 0;
2982
2983 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2984 goto out;
2985
6c5a0d89
TM		 2986 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2987 goto out;
2988
1bfe3b25
PT		 2989 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2990 goto out;
2991
8733408d
PT		 2992 spin_lock(&inode->i_lock);
2993 if (!NFS_I(inode)->layout) {
2994 spin_unlock(&inode->i_lock);
f538d0ba 2995 goto out_clear_layoutstats;
8733408d
PT		 2996 }
2997 hdr = NFS_I(inode)->layout;
2998 pnfs_get_layout_hdr(hdr);
2999 spin_unlock(&inode->i_lock);
3000
c8ad8894 3001 data = kzalloc(sizeof(*data), gfp_flags);
8733408d
PT		 3002 if (!data) {
3003 status = -ENOMEM;
3004 goto out_put;
3005 }
3006
3007 data->args.fh = NFS_FH(inode);
3008 data->args.inode = inode;
8733408d
PT		 3009 status = ld->prepare_layoutstats(&data->args);
3010 if (status)
3011 goto out_free;
3012
3013 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3014
3015out:
3016 dprintk("%s returns %d\n", __func__, status);
3017 return status;
3018
3019out_free:
3020 kfree(data);
3021out_put:
3022 pnfs_put_layout_hdr(hdr);
f538d0ba 3023out_clear_layoutstats:
1bfe3b25
PT		 3024 smp_mb__before_atomic();
3025 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3026 smp_mb__after_atomic();
8733408d
PT		 3027 goto out;
3028}
3029EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
865a7ecb 3030#endif
bbf58bf3
TM		 3031
3032unsigned int layoutstats_timer;
3033module_param(layoutstats_timer, uint, 0644);
3034EXPORT_SYMBOL_GPL(layoutstats_timer);
Linux 6.x block layer and io_uring tree(s)