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Merge tag 'kvm-arm-gicv4-for-v4.15' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-kernel.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"
85e174ba
RL		 40
41#define NFSDBG_FACILITY NFSDBG_PNFS
25c75333 42#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
85e174ba 43
02c35fca
FI		 44/* Locking:
45 *
46 * pnfs_spinlock:
47 * protects pnfs_modules_tbl.
48 */
49static DEFINE_SPINLOCK(pnfs_spinlock);
50
51/*
52 * pnfs_modules_tbl holds all pnfs modules
53 */
54static LIST_HEAD(pnfs_modules_tbl);
55
13c13a6a 56static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
68f74479
TM		 57static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
58 struct list_head *free_me,
59 const struct pnfs_layout_range *range,
60 u32 seq);
fe1cf946
TM		 61static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
62 struct list_head *tmp_list);
aa1e0e3a 63
02c35fca
FI		 64/* Return the registered pnfs layout driver module matching given id */
65static struct pnfs_layoutdriver_type *
66find_pnfs_driver_locked(u32 id)
67{
68 struct pnfs_layoutdriver_type *local;
69
70 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
71 if (local->id == id)
72 goto out;
73 local = NULL;
74out:
75 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
76 return local;
77}
78
85e174ba
RL		 79static struct pnfs_layoutdriver_type *
80find_pnfs_driver(u32 id)
81{
02c35fca
FI		 82 struct pnfs_layoutdriver_type *local;
83
84 spin_lock(&pnfs_spinlock);
85 local = find_pnfs_driver_locked(id);
0a9c63fa
TM		 86 if (local != NULL && !try_module_get(local->owner)) {
87 dprintk("%s: Could not grab reference on module\n", __func__);
88 local = NULL;
89 }
02c35fca
FI		 90 spin_unlock(&pnfs_spinlock);
91 return local;
85e174ba
RL		 92}
93
94void
95unset_pnfs_layoutdriver(struct nfs_server *nfss)
96{
738fd0f3
BH		 97 if (nfss->pnfs_curr_ld) {
98 if (nfss->pnfs_curr_ld->clear_layoutdriver)
99 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
2a4c8994
TM		 100 /* Decrement the MDS count. Purge the deviceid cache if zero */
101 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
102 nfs4_deviceid_purge_client(nfss->nfs_client);
02c35fca 103 module_put(nfss->pnfs_curr_ld->owner);
738fd0f3 104 }
85e174ba
RL		 105 nfss->pnfs_curr_ld = NULL;
106}
107
ca440c38
JL		 108/*
109 * When the server sends a list of layout types, we choose one in the order
110 * given in the list below.
111 *
112 * FIXME: should this list be configurable in some fashion? module param?
113 * mount option? something else?
114 */
115static const u32 ld_prefs[] = {
116 LAYOUT_SCSI,
117 LAYOUT_BLOCK_VOLUME,
118 LAYOUT_OSD2_OBJECTS,
119 LAYOUT_FLEX_FILES,
120 LAYOUT_NFSV4_1_FILES,
121 0
122};
123
124static int
125ld_cmp(const void *e1, const void *e2)
126{
127 u32 ld1 = *((u32 *)e1);
128 u32 ld2 = *((u32 *)e2);
129 int i;
130
131 for (i = 0; ld_prefs[i] != 0; i++) {
132 if (ld1 == ld_prefs[i])
133 return -1;
134
135 if (ld2 == ld_prefs[i])
136 return 1;
137 }
138 return 0;
139}
140
85e174ba
RL		 141/*
142 * Try to set the server's pnfs module to the pnfs layout type specified by id.
143 * Currently only one pNFS layout driver per filesystem is supported.
144 *
3132e49e 145 * @ids array of layout types supported by MDS.
85e174ba
RL		 146 */
147void
738fd0f3 148set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
ca440c38 149 struct nfs_fsinfo *fsinfo)
85e174ba
RL		 150{
151 struct pnfs_layoutdriver_type *ld_type = NULL;
3132e49e 152 u32 id;
ca440c38 153 int i;
85e174ba 154
19274716
AS		 155 if (fsinfo->nlayouttypes == 0)
156 goto out_no_driver;
85e174ba
RL		 157 if (!(server->nfs_client->cl_exchange_flags &
158 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
3132e49e
JL		 159 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
160 __func__, server->nfs_client->cl_exchange_flags);
85e174ba
RL		 161 goto out_no_driver;
162 }
3132e49e 163
ca440c38
JL		 164 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
165 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
3132e49e 166
ca440c38
JL		 167 for (i = 0; i < fsinfo->nlayouttypes; i++) {
168 id = fsinfo->layouttype[i];
85e174ba 169 ld_type = find_pnfs_driver(id);
ca440c38
JL		 170 if (!ld_type) {
171 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
172 id);
173 ld_type = find_pnfs_driver(id);
174 }
175 if (ld_type)
176 break;
85e174ba 177 }
3132e49e
JL		 178
179 if (!ld_type) {
ca440c38 180 dprintk("%s: No pNFS module found!\n", __func__);
3132e49e
JL		 181 goto out_no_driver;
182 }
183
85e174ba 184 server->pnfs_curr_ld = ld_type;
738fd0f3
BH		 185 if (ld_type->set_layoutdriver
186 && ld_type->set_layoutdriver(server, mntfh)) {
a030889a
WAA		 187 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
188 "driver %u.\n", __func__, id);
738fd0f3
BH		 189 module_put(ld_type->owner);
190 goto out_no_driver;
191 }
2a4c8994
TM		 192 /* Bump the MDS count */
193 atomic_inc(&server->nfs_client->cl_mds_count);
ea8eecdd 194
85e174ba
RL		 195 dprintk("%s: pNFS module for %u set\n", __func__, id);
196 return;
197
198out_no_driver:
199 dprintk("%s: Using NFSv4 I/O\n", __func__);
200 server->pnfs_curr_ld = NULL;
201}
02c35fca
FI		 202
203int
204pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
205{
206 int status = -EINVAL;
207 struct pnfs_layoutdriver_type *tmp;
208
209 if (ld_type->id == 0) {
a030889a 210 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
02c35fca
FI		 211 return status;
212 }
b1f69b75 213 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
a030889a 214 printk(KERN_ERR "NFS: %s Layout driver must provide "
b1f69b75
AA		 215 "alloc_lseg and free_lseg.\n", __func__);
216 return status;
217 }
02c35fca
FI		 218
219 spin_lock(&pnfs_spinlock);
220 tmp = find_pnfs_driver_locked(ld_type->id);
221 if (!tmp) {
222 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
223 status = 0;
224 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
225 ld_type->name);
226 } else {
a030889a 227 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
02c35fca
FI		 228 __func__, ld_type->id);
229 }
230 spin_unlock(&pnfs_spinlock);
231
232 return status;
233}
234EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
235
236void
237pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
238{
239 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
240 spin_lock(&pnfs_spinlock);
241 list_del(&ld_type->pnfs_tblid);
242 spin_unlock(&pnfs_spinlock);
243}
244EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
e5e94017 245
b1f69b75
AA		 246/*
247 * pNFS client layout cache
248 */
249
cc6e5340 250/* Need to hold i_lock if caller does not already hold reference */
43f1b3da 251void
70c3bd2b 252pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
e5e94017 253{
cc6e5340 254 atomic_inc(&lo->plh_refcount);
e5e94017
BH		 255}
256
636fb9c8
BH		 257static struct pnfs_layout_hdr *
258pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
259{
260 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
57934278 261 return ld->alloc_layout_hdr(ino, gfp_flags);
636fb9c8
BH		 262}
263
264static void
265pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
266{
9c626381
TM		 267 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
268 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
269
270 if (!list_empty(&lo->plh_layouts)) {
271 struct nfs_client *clp = server->nfs_client;
272
273 spin_lock(&clp->cl_lock);
274 list_del_init(&lo->plh_layouts);
275 spin_unlock(&clp->cl_lock);
276 }
9fa40758 277 put_rpccred(lo->plh_lc_cred);
57934278 278 return ld->free_layout_hdr(lo);
636fb9c8
BH		 279}
280
e5e94017 281static void
6622c3ea 282pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
e5e94017 283{
bb346f63 284 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
cc6e5340 285 dprintk("%s: freeing layout cache %p\n", __func__, lo);
bb346f63
TM		 286 nfsi->layout = NULL;
287 /* Reset MDS Threshold I/O counters */
288 nfsi->write_io = 0;
289 nfsi->read_io = 0;
e5e94017
BH		 290}
291
b1f69b75 292void
70c3bd2b 293pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
974cec8c 294{
cc6e5340
FI		 295 struct inode *inode = lo->plh_inode;
296
13c13a6a
TM		 297 pnfs_layoutreturn_before_put_layout_hdr(lo);
298
cc6e5340 299 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
566f8737
PT		 300 if (!list_empty(&lo->plh_segs))
301 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
6622c3ea 302 pnfs_detach_layout_hdr(lo);
cc6e5340 303 spin_unlock(&inode->i_lock);
6622c3ea 304 pnfs_free_layout_hdr(lo);
cc6e5340 305 }
974cec8c
AA		 306}
307
4aab9732
TM		 308static void
309pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
310 u32 seq)
311{
312 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
313 iomode = IOMODE_ANY;
314 lo->plh_return_iomode = iomode;
315 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
316 if (seq != 0) {
317 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
318 lo->plh_return_seq = seq;
319 }
320}
321
ae5a459d
TM		 322static void
323pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
324{
5466d214 325 struct pnfs_layout_segment *lseg;
ae5a459d
TM		 326 lo->plh_return_iomode = 0;
327 lo->plh_return_seq = 0;
328 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
5466d214
TM		 329 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
330 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
331 continue;
332 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
333 }
ae5a459d
TM		 334}
335
362fb578
TM		 336static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
337{
338 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
339 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
340 smp_mb__after_atomic();
341 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
342 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
343}
344
fe1cf946
TM		 345static void
346pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
347 struct list_head *free_me)
348{
349 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
350 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
351 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
352 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
353 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
354 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
355}
356
2454dfea
TM		 357/*
358 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
359 *
360 * In order to continue using the pnfs_layout_hdr, a full recovery
361 * is required.
362 * Note that caller must hold inode->i_lock.
363 */
5f46be04 364int
2454dfea
TM		 365pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
366 struct list_head *lseg_list)
367{
368 struct pnfs_layout_range range = {
369 .iomode = IOMODE_ANY,
370 .offset = 0,
371 .length = NFS4_MAX_UINT64,
372 };
fe1cf946 373 struct pnfs_layout_segment *lseg, *next;
2454dfea
TM		 374
375 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
fe1cf946
TM		 376 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
377 pnfs_clear_lseg_state(lseg, lseg_list);
5466d214 378 pnfs_clear_layoutreturn_info(lo);
68f74479 379 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
362fb578
TM		 380 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
381 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
382 pnfs_clear_layoutreturn_waitbit(lo);
fe1cf946 383 return !list_empty(&lo->plh_segs);
2454dfea
TM		 384}
385
b9e028fd
TM		 386static int
387pnfs_iomode_to_fail_bit(u32 iomode)
388{
389 return iomode == IOMODE_RW ?
390 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
391}
392
393static void
3e621214 394pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
b9e028fd 395{
25c75333 396 lo->plh_retry_timestamp = jiffies;
39e88fcf 397 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
3e621214
TM		 398 atomic_inc(&lo->plh_refcount);
399}
400
401static void
402pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
403{
404 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
405 atomic_dec(&lo->plh_refcount);
406}
407
408static void
409pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
410{
411 struct inode *inode = lo->plh_inode;
115ce575
TM		 412 struct pnfs_layout_range range = {
413 .iomode = iomode,
414 .offset = 0,
415 .length = NFS4_MAX_UINT64,
416 };
417 LIST_HEAD(head);
3e621214
TM		 418
419 spin_lock(&inode->i_lock);
420 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
6d597e17 421 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
3e621214 422 spin_unlock(&inode->i_lock);
115ce575 423 pnfs_free_lseg_list(&head);
b9e028fd
TM		 424 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
425 iomode == IOMODE_RW ? "RW" : "READ");
426}
427
428static bool
429pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
430{
25c75333 431 unsigned long start, end;
3e621214
TM		 432 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
433
434 if (test_bit(fail_bit, &lo->plh_flags) == 0)
25c75333
TM		 435 return false;
436 end = jiffies;
437 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
438 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
439 /* It is time to retry the failed layoutgets */
3e621214 440 pnfs_layout_clear_fail_bit(lo, fail_bit);
25c75333
TM		 441 return false;
442 }
443 return true;
b9e028fd
TM		 444}
445
974cec8c 446static void
119cef97
TM		 447pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
448 const struct pnfs_layout_range *range,
449 const nfs4_stateid *stateid)
974cec8c 450{
566052c5 451 INIT_LIST_HEAD(&lseg->pls_list);
a9bae566 452 INIT_LIST_HEAD(&lseg->pls_lc_list);
4541d16c 453 atomic_set(&lseg->pls_refcount, 1);
4541d16c 454 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
566052c5 455 lseg->pls_layout = lo;
119cef97
TM		 456 lseg->pls_range = *range;
457 lseg->pls_seq = be32_to_cpu(stateid->seqid);
974cec8c
AA		 458}
459
905ca191 460static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
974cec8c 461{
68f74479
TM		 462 if (lseg != NULL) {
463 struct inode *inode = lseg->pls_layout->plh_inode;
464 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
465 }
974cec8c
AA		 466}
467
d684d2ae 468static void
57036a37
TM		 469pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
470 struct pnfs_layout_segment *lseg)
d684d2ae 471{
d20581aa 472 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
d684d2ae 473 list_del_init(&lseg->pls_list);
8f0d27dc
TM		 474 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
475 atomic_dec(&lo->plh_refcount);
abb3e1c8
TM		 476 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
477 return;
7b650994
TM		 478 if (list_empty(&lo->plh_segs) &&
479 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
480 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
334a8f37
TM		 481 if (atomic_read(&lo->plh_outstanding) == 0)
482 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
173f77e9 483 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
2d148c7e 484 }
d684d2ae
FI		 485}
486
68f74479
TM		 487static bool
488pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
489 struct pnfs_layout_segment *lseg)
490{
491 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
492 pnfs_layout_is_valid(lo)) {
4aab9732 493 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
68f74479
TM		 494 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
495 return true;
496 }
497 return false;
498}
499
bae724ef 500void
9369a431 501pnfs_put_lseg(struct pnfs_layout_segment *lseg)
974cec8c 502{
57036a37 503 struct pnfs_layout_hdr *lo;
d684d2ae
FI		 504 struct inode *inode;
505
506 if (!lseg)
507 return;
508
4541d16c
FI		 509 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
510 atomic_read(&lseg->pls_refcount),
511 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
4ef2e4f8 512
57036a37
TM		 513 lo = lseg->pls_layout;
514 inode = lo->plh_inode;
4ef2e4f8 515
d684d2ae 516 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
faa4a54f
TM		 517 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
518 spin_unlock(&inode->i_lock);
519 return;
520 }
8f0d27dc 521 pnfs_get_layout_hdr(lo);
4ef2e4f8 522 pnfs_layout_remove_lseg(lo, lseg);
68f74479
TM		 523 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
524 lseg = NULL;
4ef2e4f8
TM		 525 spin_unlock(&inode->i_lock);
526 pnfs_free_lseg(lseg);
527 pnfs_put_layout_hdr(lo);
4541d16c 528 }
4541d16c 529}
9369a431 530EXPORT_SYMBOL_GPL(pnfs_put_lseg);
974cec8c 531
fb3296eb
BH		 532/*
533 * is l2 fully contained in l1?
534 * start1 end1
535 * [----------------------------------)
536 * start2 end2
537 * [----------------)
538 */
3cb2df17 539static bool
7dc0ac70 540pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
3cb2df17 541 const struct pnfs_layout_range *l2)
fb3296eb
BH		 542{
543 u64 start1 = l1->offset;
17822b20 544 u64 end1 = pnfs_end_offset(start1, l1->length);
fb3296eb 545 u64 start2 = l2->offset;
17822b20 546 u64 end2 = pnfs_end_offset(start2, l2->length);
fb3296eb
BH		 547
548 return (start1 <= start2) && (end1 >= end2);
549}
550
24956804
TM		 551static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
552 struct list_head *tmp_list)
553{
554 if (!atomic_dec_and_test(&lseg->pls_refcount))
555 return false;
556 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
557 list_add(&lseg->pls_list, tmp_list);
558 return true;
559}
560
4541d16c
FI		 561/* Returns 1 if lseg is removed from list, 0 otherwise */
562static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
563 struct list_head *tmp_list)
564{
565 int rv = 0;
566
567 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
568 /* Remove the reference keeping the lseg in the
569 * list. It will now be removed when all
570 * outstanding io is finished.
571 */
d684d2ae
FI		 572 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
573 atomic_read(&lseg->pls_refcount));
24956804 574 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
d684d2ae 575 rv = 1;
4541d16c
FI		 576 }
577 return rv;
578}
579
6d597e17
JL		 580/*
581 * Compare 2 layout stateid sequence ids, to see which is newer,
582 * taking into account wraparound issues.
583 */
584static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
585{
586 return (s32)(s1 - s2) > 0;
587}
588
e036f464
TM		 589static bool
590pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
591 const struct pnfs_layout_range *recall_range)
592{
593 return (recall_range->iomode == IOMODE_ANY ||
594 lseg_range->iomode == recall_range->iomode) &&
595 pnfs_lseg_range_intersecting(lseg_range, recall_range);
596}
597
598static bool
599pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
600 const struct pnfs_layout_range *recall_range,
601 u32 seq)
602{
603 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
604 return false;
605 if (recall_range == NULL)
606 return true;
607 return pnfs_should_free_range(&lseg->pls_range, recall_range);
608}
609
6d597e17
JL		 610/**
611 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
612 * @lo: layout header containing the lsegs
613 * @tmp_list: list head where doomed lsegs should go
614 * @recall_range: optional recall range argument to match (may be NULL)
615 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
616 *
617 * Walk the list of lsegs in the layout header, and tear down any that should
618 * be destroyed. If "recall_range" is specified then the segment must match
619 * that range. If "seq" is non-zero, then only match segments that were handed
620 * out at or before that sequence.
621 *
622 * Returns number of matching invalid lsegs remaining in list after scanning
623 * it and purging them.
4541d16c 624 */
43f1b3da 625int
49a85061 626pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
4541d16c 627 struct list_head *tmp_list,
6d597e17
JL		 628 const struct pnfs_layout_range *recall_range,
629 u32 seq)
974cec8c
AA		 630{
631 struct pnfs_layout_segment *lseg, *next;
71b39854 632 int remaining = 0;
974cec8c
AA		 633
634 dprintk("%s:Begin lo %p\n", __func__, lo);
635
8006bfba 636 if (list_empty(&lo->plh_segs))
38511722 637 return 0;
4541d16c 638 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
e036f464 639 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
6d597e17 640 dprintk("%s: freeing lseg %p iomode %d seq %u"
4541d16c 641 "offset %llu length %llu\n", __func__,
6d597e17
JL		 642 lseg, lseg->pls_range.iomode, lseg->pls_seq,
643 lseg->pls_range.offset, lseg->pls_range.length);
71b39854
TM		 644 if (!mark_lseg_invalid(lseg, tmp_list))
645 remaining++;
4541d16c 646 }
71b39854
TM		 647 dprintk("%s:Return %i\n", __func__, remaining);
648 return remaining;
974cec8c
AA		 649}
650
68f74479
TM		 651static void
652pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
653 struct list_head *free_me,
654 const struct pnfs_layout_range *range,
655 u32 seq)
656{
657 struct pnfs_layout_segment *lseg, *next;
658
659 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
660 if (pnfs_match_lseg_recall(lseg, range, seq))
661 list_move_tail(&lseg->pls_list, free_me);
662 }
663}
664
f49f9baa 665/* note free_me must contain lsegs from a single layout_hdr */
43f1b3da 666void
4541d16c 667pnfs_free_lseg_list(struct list_head *free_me)
974cec8c 668{
4541d16c 669 struct pnfs_layout_segment *lseg, *tmp;
f49f9baa
FI		 670
671 if (list_empty(free_me))
672 return;
673
4541d16c 674 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
566052c5 675 list_del(&lseg->pls_list);
905ca191 676 pnfs_free_lseg(lseg);
974cec8c
AA		 677 }
678}
679
e5e94017
BH		 680void
681pnfs_destroy_layout(struct nfs_inode *nfsi)
682{
683 struct pnfs_layout_hdr *lo;
974cec8c 684 LIST_HEAD(tmp_list);
e5e94017
BH		 685
686 spin_lock(&nfsi->vfs_inode.i_lock);
687 lo = nfsi->layout;
688 if (lo) {
3e621214 689 pnfs_get_layout_hdr(lo);
2454dfea 690 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
3e621214
TM		 691 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
692 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
693 spin_unlock(&nfsi->vfs_inode.i_lock);
694 pnfs_free_lseg_list(&tmp_list);
1f18b82c 695 nfs_commit_inode(&nfsi->vfs_inode, 0);
3e621214
TM		 696 pnfs_put_layout_hdr(lo);
697 } else
698 spin_unlock(&nfsi->vfs_inode.i_lock);
974cec8c 699}
041245c8 700EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
974cec8c 701
fd9a8d71
TM		 702static bool
703pnfs_layout_add_bulk_destroy_list(struct inode *inode,
704 struct list_head *layout_list)
974cec8c
AA		 705{
706 struct pnfs_layout_hdr *lo;
fd9a8d71 707 bool ret = false;
974cec8c 708
fd9a8d71
TM		 709 spin_lock(&inode->i_lock);
710 lo = NFS_I(inode)->layout;
711 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
712 pnfs_get_layout_hdr(lo);
713 list_add(&lo->plh_bulk_destroy, layout_list);
714 ret = true;
715 }
716 spin_unlock(&inode->i_lock);
717 return ret;
718}
719
720/* Caller must hold rcu_read_lock and clp->cl_lock */
721static int
722pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
723 struct nfs_server *server,
724 struct list_head *layout_list)
725{
726 struct pnfs_layout_hdr *lo, *next;
727 struct inode *inode;
728
729 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
b85f5620
TM		 730 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
731 continue;
fd9a8d71
TM		 732 inode = igrab(lo->plh_inode);
733 if (inode == NULL)
734 continue;
735 list_del_init(&lo->plh_layouts);
736 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
737 continue;
738 rcu_read_unlock();
739 spin_unlock(&clp->cl_lock);
740 iput(inode);
741 spin_lock(&clp->cl_lock);
742 rcu_read_lock();
743 return -EAGAIN;
744 }
745 return 0;
746}
747
748static int
749pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
750 bool is_bulk_recall)
751{
752 struct pnfs_layout_hdr *lo;
753 struct inode *inode;
fd9a8d71
TM		 754 LIST_HEAD(lseg_list);
755 int ret = 0;
756
757 while (!list_empty(layout_list)) {
758 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
759 plh_bulk_destroy);
760 dprintk("%s freeing layout for inode %lu\n", __func__,
761 lo->plh_inode->i_ino);
762 inode = lo->plh_inode;
7c5d1875
CH		 763
764 pnfs_layoutcommit_inode(inode, false);
765
fd9a8d71
TM		 766 spin_lock(&inode->i_lock);
767 list_del_init(&lo->plh_bulk_destroy);
9fd4b9fc
TM		 768 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
769 if (is_bulk_recall)
770 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
fd9a8d71 771 ret = -EAGAIN;
9fd4b9fc 772 }
fd9a8d71
TM		 773 spin_unlock(&inode->i_lock);
774 pnfs_free_lseg_list(&lseg_list);
b20135d0
TM		 775 /* Free all lsegs that are attached to commit buckets */
776 nfs_commit_inode(inode, 0);
fd9a8d71
TM		 777 pnfs_put_layout_hdr(lo);
778 iput(inode);
779 }
780 return ret;
781}
782
783int
784pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
785 struct nfs_fsid *fsid,
786 bool is_recall)
787{
788 struct nfs_server *server;
789 LIST_HEAD(layout_list);
c47abcf8 790
974cec8c 791 spin_lock(&clp->cl_lock);
6382a441 792 rcu_read_lock();
fd9a8d71 793restart:
6382a441 794 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
fd9a8d71
TM		 795 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
796 continue;
797 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
798 server,
799 &layout_list) != 0)
800 goto restart;
6382a441
WAA		 801 }
802 rcu_read_unlock();
974cec8c
AA		 803 spin_unlock(&clp->cl_lock);
804
fd9a8d71
TM		 805 if (list_empty(&layout_list))
806 return 0;
807 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
808}
809
810int
811pnfs_destroy_layouts_byclid(struct nfs_client *clp,
812 bool is_recall)
813{
814 struct nfs_server *server;
815 LIST_HEAD(layout_list);
816
817 spin_lock(&clp->cl_lock);
818 rcu_read_lock();
819restart:
820 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
821 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
822 server,
823 &layout_list) != 0)
824 goto restart;
974cec8c 825 }
fd9a8d71
TM		 826 rcu_read_unlock();
827 spin_unlock(&clp->cl_lock);
828
829 if (list_empty(&layout_list))
830 return 0;
831 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
832}
833
834/*
835 * Called by the state manger to remove all layouts established under an
836 * expired lease.
837 */
838void
839pnfs_destroy_all_layouts(struct nfs_client *clp)
840{
841 nfs4_deviceid_mark_client_invalid(clp);
842 nfs4_deviceid_purge_client(clp);
843
844 pnfs_destroy_layouts_byclid(clp, false);
e5e94017
BH		 845}
846
fd6002e9 847/* update lo->plh_stateid with new if is more recent */
43f1b3da
FI		 848void
849pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
850 bool update_barrier)
b1f69b75 851{
ecebb80b 852 u32 oldseq, newseq, new_barrier = 0;
b1f69b75 853
2d2f24ad
TM		 854 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
855 newseq = be32_to_cpu(new->seqid);
2a59a041
TM		 856
857 if (!pnfs_layout_is_valid(lo)) {
858 nfs4_stateid_copy(&lo->plh_stateid, new);
859 lo->plh_barrier = newseq;
860 pnfs_clear_layoutreturn_info(lo);
861 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
862 return;
863 }
864 if (pnfs_seqid_is_newer(newseq, oldseq)) {
f597c537 865 nfs4_stateid_copy(&lo->plh_stateid, new);
ecebb80b
TM		 866 /*
867 * Because of wraparound, we want to keep the barrier
868 * "close" to the current seqids.
869 */
870 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
43f1b3da 871 }
ecebb80b
TM		 872 if (update_barrier)
873 new_barrier = be32_to_cpu(new->seqid);
874 else if (new_barrier == 0)
875 return;
2a59a041 876 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
ecebb80b 877 lo->plh_barrier = new_barrier;
b1f69b75
AA		 878}
879
cf7d63f1 880static bool
19c54aba
TM		 881pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
882 const nfs4_stateid *stateid)
43f1b3da 883{
19c54aba 884 u32 seqid = be32_to_cpu(stateid->seqid);
25a1a621 885
19c54aba
TM		 886 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
887}
888
889/* lget is set to 1 if called from inside send_layoutget call chain */
890static bool
e1c06f80 891pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
19c54aba 892{
f7e8917a 893 return lo->plh_block_lgets ||
e1c06f80 894 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
cf7d63f1
FI		 895}
896
b1f69b75 897/*
183d9e7b
JL		 898 * Get layout from server.
899 * for now, assume that whole file layouts are requested.
900 * arg->offset: 0
901 * arg->length: all ones
902 */
e5e94017
BH		 903static struct pnfs_layout_segment *
904send_layoutget(struct pnfs_layout_hdr *lo,
905 struct nfs_open_context *ctx,
183d9e7b 906 nfs4_stateid *stateid,
e144e539 907 const struct pnfs_layout_range *range,
183d9e7b 908 long *timeout, gfp_t gfp_flags)
e5e94017 909{
b7edfaa1 910 struct inode *ino = lo->plh_inode;
b1f69b75
AA		 911 struct nfs_server *server = NFS_SERVER(ino);
912 struct nfs4_layoutget *lgp;
2d89a1d3 913 loff_t i_size;
b1f69b75
AA		 914
915 dprintk("--> %s\n", __func__);
e5e94017 916
4f2e9dce
JL		 917 /*
918 * Synchronously retrieve layout information from server and
919 * store in lseg. If we race with a concurrent seqid morphing
920 * op, then re-send the LAYOUTGET.
921 */
83026d80
JL		 922 lgp = kzalloc(sizeof(*lgp), gfp_flags);
923 if (lgp == NULL)
924 return ERR_PTR(-ENOMEM);
925
926 i_size = i_size_read(ino);
927
928 lgp->args.minlength = PAGE_SIZE;
929 if (lgp->args.minlength > range->length)
930 lgp->args.minlength = range->length;
931 if (range->iomode == IOMODE_READ) {
932 if (range->offset >= i_size)
933 lgp->args.minlength = 0;
934 else if (i_size - range->offset < lgp->args.minlength)
935 lgp->args.minlength = i_size - range->offset;
d03ab29d 936 }
83026d80
JL		 937 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
938 pnfs_copy_range(&lgp->args.range, range);
939 lgp->args.type = server->pnfs_curr_ld->id;
940 lgp->args.inode = ino;
941 lgp->args.ctx = get_nfs_open_context(ctx);
183d9e7b 942 nfs4_stateid_copy(&lgp->args.stateid, stateid);
83026d80
JL		 943 lgp->gfp_flags = gfp_flags;
944 lgp->cred = lo->plh_lc_cred;
35124a09 945
183d9e7b 946 return nfs4_proc_layoutget(lgp, timeout, gfp_flags);
974cec8c
AA		 947}
948
24956804
TM		 949static void pnfs_clear_layoutcommit(struct inode *inode,
950 struct list_head *head)
951{
952 struct nfs_inode *nfsi = NFS_I(inode);
953 struct pnfs_layout_segment *lseg, *tmp;
954
955 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
956 return;
957 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
958 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
959 continue;
960 pnfs_lseg_dec_and_remove_zero(lseg, head);
961 }
962}
963
68f74479 964void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
2a974425 965 const nfs4_stateid *arg_stateid,
68f74479 966 const struct pnfs_layout_range *range,
68f74479
TM		 967 const nfs4_stateid *stateid)
968{
969 struct inode *inode = lo->plh_inode;
970 LIST_HEAD(freeme);
971
972 spin_lock(&inode->i_lock);
2a974425
TM		 973 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
974 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
975 goto out_unlock;
68f74479 976 if (stateid) {
2a974425
TM		 977 u32 seq = be32_to_cpu(arg_stateid->seqid);
978
68f74479
TM		 979 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
980 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
981 pnfs_set_layout_stateid(lo, stateid, true);
982 } else
983 pnfs_mark_layout_stateid_invalid(lo, &freeme);
2a974425 984out_unlock:
68f74479
TM		 985 pnfs_clear_layoutreturn_waitbit(lo);
986 spin_unlock(&inode->i_lock);
987 pnfs_free_lseg_list(&freeme);
988
989}
990
13c13a6a 991static bool
e5fd1904
TM		 992pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
993 nfs4_stateid *stateid,
994 enum pnfs_iomode *iomode)
13c13a6a 995{
bf0291dd
TM		 996 /* Serialise LAYOUTGET/LAYOUTRETURN */
997 if (atomic_read(&lo->plh_outstanding) != 0)
998 return false;
6604b203 999 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
13c13a6a 1000 return false;
6604b203 1001 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
13c13a6a 1002 pnfs_get_layout_hdr(lo);
e5fd1904
TM		 1003 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1004 if (stateid != NULL) {
1005 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1006 if (lo->plh_return_seq != 0)
1007 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1008 }
1009 if (iomode != NULL)
1010 *iomode = lo->plh_return_iomode;
1011 pnfs_clear_layoutreturn_info(lo);
1012 return true;
1013 }
1014 if (stateid != NULL)
1015 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1016 if (iomode != NULL)
1017 *iomode = IOMODE_ANY;
13c13a6a
TM		 1018 return true;
1019}
1020
828ed9ec
TM		 1021static void
1022pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1023 struct pnfs_layout_hdr *lo,
1024 const nfs4_stateid *stateid,
1025 enum pnfs_iomode iomode)
1026{
1027 struct inode *inode = lo->plh_inode;
1028
1029 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1030 args->inode = inode;
1031 args->range.iomode = iomode;
1032 args->range.offset = 0;
1033 args->range.length = NFS4_MAX_UINT64;
1034 args->layout = lo;
1035 nfs4_stateid_copy(&args->stateid, stateid);
1036}
1037
f40eb5d0 1038static int
ed429d6b 1039pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
6c16605d 1040 enum pnfs_iomode iomode, bool sync)
f40eb5d0
PT		 1041{
1042 struct inode *ino = lo->plh_inode;
287bd3e9 1043 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
f40eb5d0
PT		 1044 struct nfs4_layoutreturn *lrp;
1045 int status = 0;
1046
e4af440a 1047 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
f40eb5d0
PT		 1048 if (unlikely(lrp == NULL)) {
1049 status = -ENOMEM;
1050 spin_lock(&ino->i_lock);
d67ae825 1051 pnfs_clear_layoutreturn_waitbit(lo);
f40eb5d0
PT		 1052 spin_unlock(&ino->i_lock);
1053 pnfs_put_layout_hdr(lo);
1054 goto out;
1055 }
1056
828ed9ec 1057 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
4d796d75 1058 lrp->args.ld_private = &lrp->ld_private;
f40eb5d0
PT		 1059 lrp->clp = NFS_SERVER(ino)->nfs_client;
1060 lrp->cred = lo->plh_lc_cred;
287bd3e9
TM		 1061 if (ld->prepare_layoutreturn)
1062 ld->prepare_layoutreturn(&lrp->args);
f40eb5d0 1063
6c16605d 1064 status = nfs4_proc_layoutreturn(lrp, sync);
f40eb5d0
PT		 1065out:
1066 dprintk("<-- %s status: %d\n", __func__, status);
1067 return status;
1068}
1069
13c13a6a
TM		 1070/* Return true if layoutreturn is needed */
1071static bool
1072pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1073{
1074 struct pnfs_layout_segment *s;
1075
2370abda 1076 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
13c13a6a
TM		 1077 return false;
1078
1079 /* Defer layoutreturn until all lsegs are done */
1080 list_for_each_entry(s, &lo->plh_segs, pls_list) {
1081 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1082 return false;
1083 }
1084
1085 return true;
1086}
1087
1088static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1089{
1090 struct inode *inode= lo->plh_inode;
1091
2370abda 1092 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
13c13a6a
TM		 1093 return;
1094 spin_lock(&inode->i_lock);
1095 if (pnfs_layout_need_return(lo)) {
1096 nfs4_stateid stateid;
1097 enum pnfs_iomode iomode;
1098 bool send;
1099
e5fd1904 1100 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
13c13a6a
TM		 1101 spin_unlock(&inode->i_lock);
1102 if (send) {
1103 /* Send an async layoutreturn so we dont deadlock */
1104 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1105 }
1106 } else
1107 spin_unlock(&inode->i_lock);
1108}
1109
293b3b06
AA		 1110/*
1111 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1112 * when the layout segment list is empty.
1113 *
1114 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1115 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1116 * deviceid is marked invalid.
1117 */
cbe82603
BH		 1118int
1119_pnfs_return_layout(struct inode *ino)
1120{
1121 struct pnfs_layout_hdr *lo = NULL;
1122 struct nfs_inode *nfsi = NFS_I(ino);
1123 LIST_HEAD(tmp_list);
cbe82603 1124 nfs4_stateid stateid;
24408f52 1125 int status = 0;
7f27392c 1126 bool send;
cbe82603 1127
366d5052 1128 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
cbe82603
BH		 1129
1130 spin_lock(&ino->i_lock);
1131 lo = nfsi->layout;
e5929f3c 1132 if (!lo) {
cbe82603 1133 spin_unlock(&ino->i_lock);
293b3b06
AA		 1134 dprintk("NFS: %s no layout to return\n", __func__);
1135 goto out;
cbe82603 1136 }
cbe82603 1137 /* Reference matched in nfs4_layoutreturn_release */
70c3bd2b 1138 pnfs_get_layout_hdr(lo);
24408f52
TM		 1139 /* Is there an outstanding layoutreturn ? */
1140 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1141 spin_unlock(&ino->i_lock);
1142 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1143 TASK_UNINTERRUPTIBLE))
1144 goto out_put_layout_hdr;
1145 spin_lock(&ino->i_lock);
1146 }
24956804 1147 pnfs_clear_layoutcommit(ino, &tmp_list);
6d597e17 1148 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
c88953d8
CH		 1149
1150 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1151 struct pnfs_layout_range range = {
1152 .iomode = IOMODE_ANY,
1153 .offset = 0,
1154 .length = NFS4_MAX_UINT64,
1155 };
1156 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1157 }
1158
293b3b06 1159 /* Don't send a LAYOUTRETURN if list was initially empty */
24408f52 1160 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
293b3b06 1161 spin_unlock(&ino->i_lock);
293b3b06 1162 dprintk("NFS: %s no layout segments to return\n", __func__);
7f27392c 1163 goto out_put_layout_hdr;
293b3b06 1164 }
47abadef 1165
e5fd1904 1166 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
cbe82603 1167 spin_unlock(&ino->i_lock);
7f27392c 1168 if (send)
ed429d6b 1169 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
7f27392c 1170out_put_layout_hdr:
ee6625a9 1171 pnfs_free_lseg_list(&tmp_list);
7f27392c 1172 pnfs_put_layout_hdr(lo);
cbe82603
BH		 1173out:
1174 dprintk("<-- %s status: %d\n", __func__, status);
1175 return status;
1176}
1177
24028672
TM		 1178int
1179pnfs_commit_and_return_layout(struct inode *inode)
1180{
1181 struct pnfs_layout_hdr *lo;
1182 int ret;
1183
1184 spin_lock(&inode->i_lock);
1185 lo = NFS_I(inode)->layout;
1186 if (lo == NULL) {
1187 spin_unlock(&inode->i_lock);
1188 return 0;
1189 }
1190 pnfs_get_layout_hdr(lo);
1191 /* Block new layoutgets and read/write to ds */
1192 lo->plh_block_lgets++;
1193 spin_unlock(&inode->i_lock);
1194 filemap_fdatawait(inode->i_mapping);
1195 ret = pnfs_layoutcommit_inode(inode, true);
1196 if (ret == 0)
1197 ret = _pnfs_return_layout(inode);
1198 spin_lock(&inode->i_lock);
1199 lo->plh_block_lgets--;
1200 spin_unlock(&inode->i_lock);
1201 pnfs_put_layout_hdr(lo);
1202 return ret;
1203}
1204
1c5bd76d
TM		 1205bool pnfs_roc(struct inode *ino,
1206 struct nfs4_layoutreturn_args *args,
1207 struct nfs4_layoutreturn_res *res,
1208 const struct rpc_cred *cred)
f7e8917a 1209{
40dd4b7a
TM		 1210 struct nfs_inode *nfsi = NFS_I(ino);
1211 struct nfs_open_context *ctx;
1212 struct nfs4_state *state;
f7e8917a 1213 struct pnfs_layout_hdr *lo;
1c5bd76d 1214 struct pnfs_layout_segment *lseg, *next;
193e3aa2 1215 nfs4_stateid stateid;
1c5bd76d
TM		 1216 enum pnfs_iomode iomode = 0;
1217 bool layoutreturn = false, roc = false;
e71708d4 1218 bool skip_read = false;
f7e8917a 1219
1c5bd76d
TM		 1220 if (!nfs_have_layout(ino))
1221 return false;
29ade5db 1222retry:
f7e8917a 1223 spin_lock(&ino->i_lock);
40dd4b7a 1224 lo = nfsi->layout;
0cdc329e
TM		 1225 if (!lo || !pnfs_layout_is_valid(lo) ||
1226 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
40dd4b7a 1227 goto out_noroc;
29ade5db
TM		 1228 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1229 pnfs_get_layout_hdr(lo);
1230 spin_unlock(&ino->i_lock);
1231 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1232 TASK_UNINTERRUPTIBLE);
1233 pnfs_put_layout_hdr(lo);
1234 goto retry;
1235 }
40dd4b7a 1236
e755d638 1237 /* no roc if we hold a delegation */
e71708d4
TM		 1238 if (nfs4_check_delegation(ino, FMODE_READ)) {
1239 if (nfs4_check_delegation(ino, FMODE_WRITE))
1240 goto out_noroc;
1241 skip_read = true;
1242 }
40dd4b7a
TM		 1243
1244 list_for_each_entry(ctx, &nfsi->open_files, list) {
1245 state = ctx->state;
e71708d4
TM		 1246 if (state == NULL)
1247 continue;
40dd4b7a 1248 /* Don't return layout if there is open file state */
e71708d4 1249 if (state->state & FMODE_WRITE)
40dd4b7a 1250 goto out_noroc;
e71708d4
TM		 1251 if (state->state & FMODE_READ)
1252 skip_read = true;
40dd4b7a
TM		 1253 }
1254
e755d638 1255
1c5bd76d 1256 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
e71708d4
TM		 1257 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1258 continue;
e755d638 1259 /* If we are sending layoutreturn, invalidate all valid lsegs */
1c5bd76d
TM		 1260 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1261 continue;
1262 /*
1263 * Note: mark lseg for return so pnfs_layout_remove_lseg
1264 * doesn't invalidate the layout for us.
1265 */
1266 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1267 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1268 continue;
1269 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
69820d22
TM		 1270 }
1271
1c5bd76d
TM		 1272 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1273 goto out_noroc;
69820d22 1274
500d701f 1275 /* ROC in two conditions:
e755d638
PT		 1276 * 1. there are ROC lsegs
1277 * 2. we don't send layoutreturn
e755d638 1278 */
1c5bd76d
TM		 1279 /* lo ref dropped in pnfs_roc_release() */
1280 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1281 /* If the creds don't match, we can't compound the layoutreturn */
1282 if (!layoutreturn || cred != lo->plh_lc_cred)
1283 goto out_noroc;
1284
1285 roc = layoutreturn;
1286 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1287 res->lrs_present = 0;
1288 layoutreturn = false;
f7e8917a 1289
40dd4b7a 1290out_noroc:
f7e8917a 1291 spin_unlock(&ino->i_lock);
e755d638 1292 pnfs_layoutcommit_inode(ino, true);
287bd3e9
TM		 1293 if (roc) {
1294 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1295 if (ld->prepare_layoutreturn)
1296 ld->prepare_layoutreturn(args);
1297 return true;
1298 }
e755d638 1299 if (layoutreturn)
1c5bd76d 1300 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
287bd3e9 1301 return false;
f7e8917a
FI		 1302}
1303
1c5bd76d
TM		 1304void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1305 struct nfs4_layoutreturn_res *res,
1306 int ret)
f7e8917a 1307{
1c5bd76d
TM		 1308 struct pnfs_layout_hdr *lo = args->layout;
1309 const nfs4_stateid *arg_stateid = NULL;
1310 const nfs4_stateid *res_stateid = NULL;
287bd3e9 1311 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
f7e8917a 1312
1c5bd76d
TM		 1313 if (ret == 0) {
1314 arg_stateid = &args->stateid;
1315 if (res->lrs_present)
1316 res_stateid = &res->stateid;
1317 }
1318 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1319 res_stateid);
287bd3e9
TM		 1320 if (ld_private && ld_private->ops && ld_private->ops->free)
1321 ld_private->ops->free(ld_private);
1c5bd76d
TM		 1322 pnfs_put_layout_hdr(lo);
1323 trace_nfs4_layoutreturn_on_close(args->inode, 0);
f7e8917a
FI		 1324}
1325
500d701f
PT		 1326bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1327{
1328 struct nfs_inode *nfsi = NFS_I(ino);
1329 struct pnfs_layout_hdr *lo;
1330 bool sleep = false;
1331
1332 /* we might not have grabbed lo reference. so need to check under
1333 * i_lock */
1334 spin_lock(&ino->i_lock);
1335 lo = nfsi->layout;
ee284e35
TM		 1336 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1337 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
500d701f 1338 sleep = true;
ee284e35 1339 }
500d701f 1340 spin_unlock(&ino->i_lock);
500d701f
PT		 1341 return sleep;
1342}
1343
b1f69b75
AA		 1344/*
1345 * Compare two layout segments for sorting into layout cache.
1346 * We want to preferentially return RW over RO layouts, so ensure those
1347 * are seen first.
1348 */
1349static s64
7dc0ac70 1350pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
3cb2df17 1351 const struct pnfs_layout_range *l2)
b1f69b75 1352{
fb3296eb
BH		 1353 s64 d;
1354
1355 /* high offset > low offset */
1356 d = l1->offset - l2->offset;
1357 if (d)
1358 return d;
1359
1360 /* short length > long length */
1361 d = l2->length - l1->length;
1362 if (d)
1363 return d;
1364
b1f69b75 1365 /* read > read/write */
fb3296eb 1366 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
b1f69b75
AA		 1367}
1368
03772d2f
TM		 1369static bool
1370pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1371 const struct pnfs_layout_range *l2)
1372{
1373 return pnfs_lseg_range_cmp(l1, l2) > 0;
1374}
1375
1376static bool
1377pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1378 struct pnfs_layout_segment *old)
1379{
1380 return false;
1381}
1382
1383void
1384pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1385 struct pnfs_layout_segment *lseg,
1386 bool (*is_after)(const struct pnfs_layout_range *,
1387 const struct pnfs_layout_range *),
1388 bool (*do_merge)(struct pnfs_layout_segment *,
1389 struct pnfs_layout_segment *),
1390 struct list_head *free_me)
974cec8c 1391{
03772d2f 1392 struct pnfs_layout_segment *lp, *tmp;
b1f69b75 1393
974cec8c
AA		 1394 dprintk("%s:Begin\n", __func__);
1395
03772d2f
TM		 1396 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1397 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1398 continue;
1399 if (do_merge(lseg, lp)) {
1400 mark_lseg_invalid(lp, free_me);
1401 continue;
1402 }
1403 if (is_after(&lseg->pls_range, &lp->pls_range))
b1f69b75 1404 continue;
566052c5 1405 list_add_tail(&lseg->pls_list, &lp->pls_list);
b1f69b75
AA		 1406 dprintk("%s: inserted lseg %p "
1407 "iomode %d offset %llu length %llu before "
1408 "lp %p iomode %d offset %llu length %llu\n",
566052c5
FI		 1409 __func__, lseg, lseg->pls_range.iomode,
1410 lseg->pls_range.offset, lseg->pls_range.length,
1411 lp, lp->pls_range.iomode, lp->pls_range.offset,
1412 lp->pls_range.length);
fb3296eb 1413 goto out;
974cec8c 1414 }
fb3296eb
BH		 1415 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1416 dprintk("%s: inserted lseg %p "
1417 "iomode %d offset %llu length %llu at tail\n",
1418 __func__, lseg, lseg->pls_range.iomode,
1419 lseg->pls_range.offset, lseg->pls_range.length);
1420out:
70c3bd2b 1421 pnfs_get_layout_hdr(lo);
974cec8c
AA		 1422
1423 dprintk("%s:Return\n", __func__);
e5e94017 1424}
03772d2f
TM		 1425EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1426
1427static void
1428pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1429 struct pnfs_layout_segment *lseg,
1430 struct list_head *free_me)
1431{
1432 struct inode *inode = lo->plh_inode;
1433 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1434
1435 if (ld->add_lseg != NULL)
1436 ld->add_lseg(lo, lseg, free_me);
1437 else
1438 pnfs_generic_layout_insert_lseg(lo, lseg,
1439 pnfs_lseg_range_is_after,
1440 pnfs_lseg_no_merge,
1441 free_me);
1442}
e5e94017
BH		 1443
1444static struct pnfs_layout_hdr *
9fa40758
PT		 1445alloc_init_layout_hdr(struct inode *ino,
1446 struct nfs_open_context *ctx,
1447 gfp_t gfp_flags)
e5e94017
BH		 1448{
1449 struct pnfs_layout_hdr *lo;
1450
636fb9c8 1451 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
e5e94017
BH		 1452 if (!lo)
1453 return NULL;
cc6e5340 1454 atomic_set(&lo->plh_refcount, 1);
b7edfaa1
FI		 1455 INIT_LIST_HEAD(&lo->plh_layouts);
1456 INIT_LIST_HEAD(&lo->plh_segs);
68f74479 1457 INIT_LIST_HEAD(&lo->plh_return_segs);
fd9a8d71 1458 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
b7edfaa1 1459 lo->plh_inode = ino;
5cc2216d 1460 lo->plh_lc_cred = get_rpccred(ctx->cred);
67a3b721 1461 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
e5e94017
BH		 1462 return lo;
1463}
1464
1465static struct pnfs_layout_hdr *
9fa40758
PT		 1466pnfs_find_alloc_layout(struct inode *ino,
1467 struct nfs_open_context *ctx,
1468 gfp_t gfp_flags)
e5241e43
TM		 1469 __releases(&ino->i_lock)
1470 __acquires(&ino->i_lock)
e5e94017
BH		 1471{
1472 struct nfs_inode *nfsi = NFS_I(ino);
1473 struct pnfs_layout_hdr *new = NULL;
1474
1475 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1476
251ec410
TM		 1477 if (nfsi->layout != NULL)
1478 goto out_existing;
e5e94017 1479 spin_unlock(&ino->i_lock);
9fa40758 1480 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
e5e94017
BH		 1481 spin_lock(&ino->i_lock);
1482
251ec410 1483 if (likely(nfsi->layout == NULL)) { /* Won the race? */
e5e94017 1484 nfsi->layout = new;
251ec410 1485 return new;
7175fe90
YN		 1486 } else if (new != NULL)
1487 pnfs_free_layout_hdr(new);
251ec410
TM		 1488out_existing:
1489 pnfs_get_layout_hdr(nfsi->layout);
e5e94017
BH		 1490 return nfsi->layout;
1491}
1492
b1f69b75
AA		 1493/*
1494 * iomode matching rules:
c7d73af2
TH		 1495 * iomode lseg strict match
1496 * iomode
1497 * ----- ----- ------ -----
1498 * ANY READ N/A true
1499 * ANY RW N/A true
1500 * RW READ N/A false
1501 * RW RW N/A true
1502 * READ READ N/A true
1503 * READ RW true false
1504 * READ RW false true
b1f69b75 1505 */
3cb2df17 1506static bool
7dc0ac70 1507pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
c7d73af2
TH		 1508 const struct pnfs_layout_range *range,
1509 bool strict_iomode)
b1f69b75 1510{
fb3296eb
BH		 1511 struct pnfs_layout_range range1;
1512
1513 if ((range->iomode == IOMODE_RW &&
1514 ls_range->iomode != IOMODE_RW) ||
c7d73af2
TH		 1515 (range->iomode != ls_range->iomode &&
1516 strict_iomode == true) ||
7dc0ac70 1517 !pnfs_lseg_range_intersecting(ls_range, range))
fb3296eb
BH		 1518 return 0;
1519
1520 /* range1 covers only the first byte in the range */
1521 range1 = *range;
1522 range1.length = 1;
7dc0ac70 1523 return pnfs_lseg_range_contained(ls_range, &range1);
b1f69b75
AA		 1524}
1525
1526/*
1527 * lookup range in layout
1528 */
e5e94017 1529static struct pnfs_layout_segment *
fb3296eb 1530pnfs_find_lseg(struct pnfs_layout_hdr *lo,
c7d73af2
TH		 1531 struct pnfs_layout_range *range,
1532 bool strict_iomode)
e5e94017 1533{
b1f69b75
AA		 1534 struct pnfs_layout_segment *lseg, *ret = NULL;
1535
1536 dprintk("%s:Begin\n", __func__);
1537
b7edfaa1 1538 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
4541d16c 1539 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
ce6ab4f2 1540 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
c7d73af2
TH		 1541 pnfs_lseg_range_match(&lseg->pls_range, range,
1542 strict_iomode)) {
9369a431 1543 ret = pnfs_get_lseg(lseg);
b1f69b75
AA		 1544 break;
1545 }
b1f69b75
AA		 1546 }
1547
1548 dprintk("%s:Return lseg %p ref %d\n",
4541d16c 1549 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
b1f69b75 1550 return ret;
e5e94017
BH		 1551}
1552
d23d61c8
AA		 1553/*
1554 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1555 * to the MDS or over pNFS
1556 *
1557 * The nfs_inode read_io and write_io fields are cumulative counters reset
1558 * when there are no layout segments. Note that in pnfs_update_layout iomode
1559 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1560 * WRITE request.
1561 *
1562 * A return of true means use MDS I/O.
1563 *
1564 * From rfc 5661:
1565 * If a file's size is smaller than the file size threshold, data accesses
1566 * SHOULD be sent to the metadata server. If an I/O request has a length that
1567 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1568 * server. If both file size and I/O size are provided, the client SHOULD
1569 * reach or exceed both thresholds before sending its read or write
1570 * requests to the data server.
1571 */
1572static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1573 struct inode *ino, int iomode)
1574{
1575 struct nfs4_threshold *t = ctx->mdsthreshold;
1576 struct nfs_inode *nfsi = NFS_I(ino);
1577 loff_t fsize = i_size_read(ino);
1578 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1579
1580 if (t == NULL)
1581 return ret;
1582
1583 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1584 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1585
1586 switch (iomode) {
1587 case IOMODE_READ:
1588 if (t->bm & THRESHOLD_RD) {
1589 dprintk("%s fsize %llu\n", __func__, fsize);
1590 size_set = true;
1591 if (fsize < t->rd_sz)
1592 size = true;
1593 }
1594 if (t->bm & THRESHOLD_RD_IO) {
1595 dprintk("%s nfsi->read_io %llu\n", __func__,
1596 nfsi->read_io);
1597 io_set = true;
1598 if (nfsi->read_io < t->rd_io_sz)
1599 io = true;
1600 }
1601 break;
1602 case IOMODE_RW:
1603 if (t->bm & THRESHOLD_WR) {
1604 dprintk("%s fsize %llu\n", __func__, fsize);
1605 size_set = true;
1606 if (fsize < t->wr_sz)
1607 size = true;
1608 }
1609 if (t->bm & THRESHOLD_WR_IO) {
1610 dprintk("%s nfsi->write_io %llu\n", __func__,
1611 nfsi->write_io);
1612 io_set = true;
1613 if (nfsi->write_io < t->wr_io_sz)
1614 io = true;
1615 }
1616 break;
1617 }
1618 if (size_set && io_set) {
1619 if (size && io)
1620 ret = true;
1621 } else if (size || io)
1622 ret = true;
1623
1624 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1625 return ret;
1626}
1627
aa8a45ee
PT		 1628static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1629{
1630 /*
1631 * send layoutcommit as it can hold up layoutreturn due to lseg
1632 * reference
1633 */
1634 pnfs_layoutcommit_inode(lo->plh_inode, false);
1635 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
2e5b29f0 1636 nfs_wait_bit_killable,
aa8a45ee
PT		 1637 TASK_UNINTERRUPTIBLE);
1638}
1639
d67ae825
TH		 1640static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1641{
1642 unsigned long *bitlock = &lo->plh_flags;
1643
1644 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1645 smp_mb__after_atomic();
1646 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1647}
1648
e5e94017
BH		 1649/*
1650 * Layout segment is retreived from the server if not cached.
1651 * The appropriate layout segment is referenced and returned to the caller.
1652 */
7c24d948 1653struct pnfs_layout_segment *
e5e94017
BH		 1654pnfs_update_layout(struct inode *ino,
1655 struct nfs_open_context *ctx,
fb3296eb
BH		 1656 loff_t pos,
1657 u64 count,
a75b9df9 1658 enum pnfs_iomode iomode,
c7d73af2 1659 bool strict_iomode,
a75b9df9 1660 gfp_t gfp_flags)
e5e94017 1661{
fb3296eb
BH		 1662 struct pnfs_layout_range arg = {
1663 .iomode = iomode,
1664 .offset = pos,
1665 .length = count,
1666 };
70d2f7b1 1667 unsigned pg_offset;
6382a441
WAA		 1668 struct nfs_server *server = NFS_SERVER(ino);
1669 struct nfs_client *clp = server->nfs_client;
183d9e7b 1670 struct pnfs_layout_hdr *lo = NULL;
e5e94017 1671 struct pnfs_layout_segment *lseg = NULL;
183d9e7b
JL		 1672 nfs4_stateid stateid;
1673 long timeout = 0;
66b53f32 1674 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
30005121 1675 bool first;
e5e94017 1676
9a4bf31d 1677 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
183d9e7b 1678 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1679 PNFS_UPDATE_LAYOUT_NO_PNFS);
f86bbcf8 1680 goto out;
9a4bf31d 1681 }
d23d61c8 1682
9a4bf31d 1683 if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
183d9e7b 1684 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1685 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
4ae93560 1686 goto out;
9a4bf31d 1687 }
4ae93560 1688
9a4bf31d 1689 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
183d9e7b 1690 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1691 PNFS_UPDATE_LAYOUT_MDSTHRESH);
f86bbcf8 1692 goto out;
9a4bf31d 1693 }
d23d61c8 1694
9bf87482 1695lookup_again:
b88fa69e 1696 nfs4_client_recover_expired_lease(clp);
9bf87482 1697 first = false;
e5e94017 1698 spin_lock(&ino->i_lock);
9fa40758 1699 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
830ffb56
TM		 1700 if (lo == NULL) {
1701 spin_unlock(&ino->i_lock);
183d9e7b 1702 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1703 PNFS_UPDATE_LAYOUT_NOMEM);
830ffb56
TM		 1704 goto out;
1705 }
e5e94017 1706
43f1b3da 1707 /* Do we even need to bother with this? */
a59c30ac 1708 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
183d9e7b 1709 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1710 PNFS_UPDATE_LAYOUT_BULK_RECALL);
43f1b3da 1711 dprintk("%s matches recall, use MDS\n", __func__);
e5e94017
BH		 1712 goto out_unlock;
1713 }
1714
1715 /* if LAYOUTGET already failed once we don't try again */
2e5b29f0 1716 if (pnfs_layout_io_test_failed(lo, iomode)) {
183d9e7b 1717 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1718 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
e5e94017 1719 goto out_unlock;
9a4bf31d 1720 }
e5e94017 1721
c7d73af2 1722 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
183d9e7b
JL		 1723 if (lseg) {
1724 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1725 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1726 goto out_unlock;
1727 }
1728
1729 if (!nfs4_valid_open_stateid(ctx->state)) {
1730 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1731 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1732 goto out_unlock;
1733 }
1734
1735 /*
1736 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1737 * stateid, or it has been invalidated, then we must use the open
1738 * stateid.
1739 */
67a3b721 1740 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
183d9e7b
JL		 1741
1742 /*
1743 * The first layoutget for the file. Need to serialize per
9bf87482
PT		 1744 * RFC 5661 Errata 3208.
1745 */
1746 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1747 &lo->plh_flags)) {
1748 spin_unlock(&ino->i_lock);
1749 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1750 TASK_UNINTERRUPTIBLE);
1751 pnfs_put_layout_hdr(lo);
183d9e7b 1752 dprintk("%s retrying\n", __func__);
9bf87482
PT		 1753 goto lookup_again;
1754 }
183d9e7b
JL		 1755
1756 first = true;
70d2f7b1
TM		 1757 if (nfs4_select_rw_stateid(ctx->state,
1758 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
1759 NULL, &stateid, NULL) != 0) {
1760 trace_pnfs_update_layout(ino, pos, count,
1761 iomode, lo, lseg,
1762 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1763 goto out_unlock;
1764 }
9bf87482 1765 } else {
183d9e7b 1766 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
9bf87482 1767 }
568e8c49 1768
aa8a45ee
PT		 1769 /*
1770 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1771 * for LAYOUTRETURN even if first is true.
1772 */
8f70f53a 1773 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
aa8a45ee
PT		 1774 spin_unlock(&ino->i_lock);
1775 dprintk("%s wait for layoutreturn\n", __func__);
1776 if (pnfs_prepare_to_retry_layoutget(lo)) {
d67ae825
TH		 1777 if (first)
1778 pnfs_clear_first_layoutget(lo);
aa8a45ee
PT		 1779 pnfs_put_layout_hdr(lo);
1780 dprintk("%s retrying\n", __func__);
183d9e7b
JL		 1781 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1782 lseg, PNFS_UPDATE_LAYOUT_RETRY);
aa8a45ee
PT		 1783 goto lookup_again;
1784 }
183d9e7b 1785 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1786 PNFS_UPDATE_LAYOUT_RETURN);
aa8a45ee
PT		 1787 goto out_put_layout_hdr;
1788 }
1789
9a4bf31d 1790 if (pnfs_layoutgets_blocked(lo)) {
183d9e7b 1791 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1792 PNFS_UPDATE_LAYOUT_BLOCKED);
cf7d63f1 1793 goto out_unlock;
9a4bf31d 1794 }
cf7d63f1 1795 atomic_inc(&lo->plh_outstanding);
f49f9baa 1796 spin_unlock(&ino->i_lock);
30005121 1797
abb9a007 1798 if (list_empty(&lo->plh_layouts)) {
2130ff66
FI		 1799 /* The lo must be on the clp list if there is any
1800 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1801 */
1802 spin_lock(&clp->cl_lock);
abb9a007
PT		 1803 if (list_empty(&lo->plh_layouts))
1804 list_add_tail(&lo->plh_layouts, &server->layouts);
2130ff66
FI		 1805 spin_unlock(&clp->cl_lock);
1806 }
e5e94017 1807
09cbfeaf 1808 pg_offset = arg.offset & ~PAGE_MASK;
707ed5fd
BH		 1809 if (pg_offset) {
1810 arg.offset -= pg_offset;
1811 arg.length += pg_offset;
1812 }
7c24d948 1813 if (arg.length != NFS4_MAX_UINT64)
09cbfeaf 1814 arg.length = PAGE_ALIGN(arg.length);
707ed5fd 1815
183d9e7b
JL		 1816 lseg = send_layoutget(lo, ctx, &stateid, &arg, &timeout, gfp_flags);
1817 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1818 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
56b38a1f 1819 atomic_dec(&lo->plh_outstanding);
83026d80 1820 if (IS_ERR(lseg)) {
183d9e7b 1821 switch(PTR_ERR(lseg)) {
e85d7ee4 1822 case -EBUSY:
183d9e7b
JL		 1823 if (time_after(jiffies, giveup))
1824 lseg = NULL;
66b53f32
TM		 1825 break;
1826 case -ERECALLCONFLICT:
1827 /* Huh? We hold no layouts, how is there a recall? */
1828 if (first) {
1829 lseg = NULL;
1830 break;
1831 }
1832 /* Destroy the existing layout and start over */
1833 if (time_after(jiffies, giveup))
1834 pnfs_destroy_layout(NFS_I(ino));
183d9e7b
JL		 1835 /* Fallthrough */
1836 case -EAGAIN:
56b38a1f 1837 break;
183d9e7b
JL		 1838 default:
1839 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
1840 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1841 lseg = NULL;
1842 }
56b38a1f
TM		 1843 goto out_put_layout_hdr;
1844 }
1845 if (lseg) {
1846 if (first)
1847 pnfs_clear_first_layoutget(lo);
1848 trace_pnfs_update_layout(ino, pos, count,
1849 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
1850 pnfs_put_layout_hdr(lo);
1851 goto lookup_again;
83026d80
JL		 1852 }
1853 } else {
1854 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1855 }
1856
830ffb56 1857out_put_layout_hdr:
d67ae825
TH		 1858 if (first)
1859 pnfs_clear_first_layoutget(lo);
70c3bd2b 1860 pnfs_put_layout_hdr(lo);
e5e94017 1861out:
f86bbcf8
TM		 1862 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1863 "(%s, offset: %llu, length: %llu)\n",
1864 __func__, ino->i_sb->s_id,
1865 (unsigned long long)NFS_FILEID(ino),
d600ad1f 1866 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
f86bbcf8
TM		 1867 iomode==IOMODE_RW ? "read/write" : "read-only",
1868 (unsigned long long)pos,
1869 (unsigned long long)count);
e5e94017
BH		 1870 return lseg;
1871out_unlock:
1872 spin_unlock(&ino->i_lock);
830ffb56 1873 goto out_put_layout_hdr;
e5e94017 1874}
7c24d948 1875EXPORT_SYMBOL_GPL(pnfs_update_layout);
b1f69b75 1876
540d9864
TM		 1877static bool
1878pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1879{
1880 switch (range->iomode) {
1881 case IOMODE_READ:
1882 case IOMODE_RW:
1883 break;
1884 default:
1885 return false;
1886 }
1887 if (range->offset == NFS4_MAX_UINT64)
1888 return false;
1889 if (range->length == 0)
1890 return false;
1891 if (range->length != NFS4_MAX_UINT64 &&
1892 range->length > NFS4_MAX_UINT64 - range->offset)
1893 return false;
1894 return true;
1895}
1896
a0b0a6e3 1897struct pnfs_layout_segment *
b1f69b75
AA		 1898pnfs_layout_process(struct nfs4_layoutget *lgp)
1899{
1900 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1901 struct nfs4_layoutget_res *res = &lgp->res;
1902 struct pnfs_layout_segment *lseg;
b7edfaa1 1903 struct inode *ino = lo->plh_inode;
78096cca 1904 LIST_HEAD(free_me);
540d9864
TM		 1905
1906 if (!pnfs_sanity_check_layout_range(&res->range))
1b3c6d07 1907 return ERR_PTR(-EINVAL);
b1f69b75
AA		 1908
1909 /* Inject layout blob into I/O device driver */
a75b9df9 1910 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1b3c6d07 1911 if (IS_ERR_OR_NULL(lseg)) {
b1f69b75 1912 if (!lseg)
1b3c6d07
JL		 1913 lseg = ERR_PTR(-ENOMEM);
1914
1915 dprintk("%s: Could not allocate layout: error %ld\n",
1916 __func__, PTR_ERR(lseg));
1917 return lseg;
b1f69b75
AA		 1918 }
1919
119cef97 1920 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
1013df61 1921
b1f69b75 1922 spin_lock(&ino->i_lock);
e1c06f80 1923 if (pnfs_layoutgets_blocked(lo)) {
43f1b3da 1924 dprintk("%s forget reply due to state\n", __func__);
1b3c6d07 1925 goto out_forget;
43f1b3da 1926 }
038d6493 1927
9888d837
TM		 1928 if (!pnfs_layout_is_valid(lo)) {
1929 /* We have a completely new layout */
1930 pnfs_set_layout_stateid(lo, &res->stateid, true);
1931 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
362f7474
CH		 1932 /* existing state ID, make sure the sequence number matches. */
1933 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1934 dprintk("%s forget reply due to sequence\n", __func__);
1b3c6d07 1935 goto out_forget;
362f7474
CH		 1936 }
1937 pnfs_set_layout_stateid(lo, &res->stateid, false);
1938 } else {
1939 /*
1940 * We got an entirely new state ID. Mark all segments for the
9888d837 1941 * inode invalid, and retry the layoutget
362f7474 1942 */
d9b61708 1943 pnfs_mark_layout_stateid_invalid(lo, &free_me);
9888d837 1944 goto out_forget;
362f7474 1945 }
038d6493 1946
9369a431 1947 pnfs_get_lseg(lseg);
03772d2f 1948 pnfs_layout_insert_lseg(lo, lseg, &free_me);
8e0acf90 1949
b1f69b75 1950
3976143b 1951 if (res->return_on_close)
f7e8917a 1952 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
f7e8917a 1953
b1f69b75 1954 spin_unlock(&ino->i_lock);
78096cca 1955 pnfs_free_lseg_list(&free_me);
a0b0a6e3 1956 return lseg;
43f1b3da 1957
1b3c6d07 1958out_forget:
43f1b3da
FI		 1959 spin_unlock(&ino->i_lock);
1960 lseg->pls_layout = lo;
1961 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1f18b82c
TM		 1962 if (!pnfs_layout_is_valid(lo))
1963 nfs_commit_inode(ino, 0);
1b3c6d07 1964 return ERR_PTR(-EAGAIN);
b1f69b75
AA		 1965}
1966
2f215968
TM		 1967/**
1968 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1969 * @lo: pointer to layout header
1970 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1971 * @return_range: describe layout segment ranges to be returned
1972 *
1973 * This function is mainly intended for use by layoutrecall. It attempts
1974 * to free the layout segment immediately, or else to mark it for return
1975 * as soon as its reference count drops to zero.
1976 */
10335556 1977int
016256df
PT		 1978pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
1979 struct list_head *tmp_list,
6d597e17
JL		 1980 const struct pnfs_layout_range *return_range,
1981 u32 seq)
016256df
PT		 1982{
1983 struct pnfs_layout_segment *lseg, *next;
10335556 1984 int remaining = 0;
016256df
PT		 1985
1986 dprintk("%s:Begin lo %p\n", __func__, lo);
1987
1988 if (list_empty(&lo->plh_segs))
10335556 1989 return 0;
016256df 1990
fc7ff367 1991 assert_spin_locked(&lo->plh_inode->i_lock);
016256df
PT		 1992
1993 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
e036f464 1994 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
016256df
PT		 1995 dprintk("%s: marking lseg %p iomode %d "
1996 "offset %llu length %llu\n", __func__,
1997 lseg, lseg->pls_range.iomode,
1998 lseg->pls_range.offset,
1999 lseg->pls_range.length);
2f215968
TM		 2000 if (mark_lseg_invalid(lseg, tmp_list))
2001 continue;
2002 remaining++;
016256df 2003 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
016256df 2004 }
6d597e17
JL		 2005
2006 if (remaining)
2007 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2008
10335556 2009 return remaining;
016256df
PT		 2010}
2011
2012void pnfs_error_mark_layout_for_return(struct inode *inode,
2013 struct pnfs_layout_segment *lseg)
2014{
2015 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
016256df
PT		 2016 struct pnfs_layout_range range = {
2017 .iomode = lseg->pls_range.iomode,
2018 .offset = 0,
2019 .length = NFS4_MAX_UINT64,
2020 };
10335556 2021 bool return_now = false;
016256df
PT		 2022
2023 spin_lock(&inode->i_lock);
bdebfccd
TM		 2024 if (!pnfs_layout_is_valid(lo)) {
2025 spin_unlock(&inode->i_lock);
2026 return;
2027 }
2d6cf5ab 2028 pnfs_set_plh_return_info(lo, range.iomode, 0);
016256df
PT		 2029 /*
2030 * mark all matching lsegs so that we are sure to have no live
2031 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2032 * for how it works.
2033 */
68f74479 2034 if (!pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0)) {
10335556 2035 nfs4_stateid stateid;
e5fd1904 2036 enum pnfs_iomode iomode;
10335556 2037
e5fd1904 2038 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
10335556
TM		 2039 spin_unlock(&inode->i_lock);
2040 if (return_now)
2041 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2042 } else {
2043 spin_unlock(&inode->i_lock);
2044 nfs_commit_inode(inode, 0);
2045 }
016256df
PT		 2046}
2047EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2048
b3230e80
TM		 2049void
2050pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2051{
2052 if (pgio->pg_lseg == NULL ||
2053 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2054 return;
2055 pnfs_put_lseg(pgio->pg_lseg);
2056 pgio->pg_lseg = NULL;
2057}
2058EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2059
08cb5b0f
BC		 2060/*
2061 * Check for any intersection between the request and the pgio->pg_lseg,
2062 * and if none, put this pgio->pg_lseg away.
2063 */
2064static void
2065pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2066{
2067 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2068 pnfs_put_lseg(pgio->pg_lseg);
2069 pgio->pg_lseg = NULL;
2070 }
2071}
2072
d8007d4d
TM		 2073void
2074pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2075{
1fd937bd
PT		 2076 u64 rd_size = req->wb_bytes;
2077
b3230e80 2078 pnfs_generic_pg_check_layout(pgio);
08cb5b0f 2079 pnfs_generic_pg_check_range(pgio, req);
cb5d04bc
PT		 2080 if (pgio->pg_lseg == NULL) {
2081 if (pgio->pg_dreq == NULL)
2082 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2083 else
2084 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2085
2086 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2087 req->wb_context,
2088 req_offset(req),
2089 rd_size,
2090 IOMODE_READ,
c7d73af2 2091 false,
cb5d04bc 2092 GFP_KERNEL);
d600ad1f
PT		 2093 if (IS_ERR(pgio->pg_lseg)) {
2094 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2095 pgio->pg_lseg = NULL;
2096 return;
2097 }
cb5d04bc 2098 }
e885de1a
TM		 2099 /* If no lseg, fall back to read through mds */
2100 if (pgio->pg_lseg == NULL)
1f945357 2101 nfs_pageio_reset_read_mds(pgio);
e885de1a 2102
d8007d4d
TM		 2103}
2104EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2105
2106void
6296556f
PT		 2107pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2108 struct nfs_page *req, u64 wb_size)
d8007d4d 2109{
b3230e80 2110 pnfs_generic_pg_check_layout(pgio);
08cb5b0f 2111 pnfs_generic_pg_check_range(pgio, req);
d600ad1f 2112 if (pgio->pg_lseg == NULL) {
cb5d04bc
PT		 2113 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2114 req->wb_context,
2115 req_offset(req),
2116 wb_size,
2117 IOMODE_RW,
c7d73af2 2118 false,
cb5d04bc 2119 GFP_NOFS);
d600ad1f
PT		 2120 if (IS_ERR(pgio->pg_lseg)) {
2121 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2122 pgio->pg_lseg = NULL;
2123 return;
2124 }
2125 }
e885de1a
TM		 2126 /* If no lseg, fall back to write through mds */
2127 if (pgio->pg_lseg == NULL)
1f945357 2128 nfs_pageio_reset_write_mds(pgio);
d8007d4d
TM		 2129}
2130EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2131
180bb5ec
WAA		 2132void
2133pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2134{
2135 if (desc->pg_lseg) {
2136 pnfs_put_lseg(desc->pg_lseg);
2137 desc->pg_lseg = NULL;
2138 }
2139}
2140EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2141
b4fdac1a
WAA		 2142/*
2143 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2144 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2145 */
2146size_t
a7d42ddb
WAA		 2147pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2148 struct nfs_page *prev, struct nfs_page *req)
94ad1c80 2149{
0f9c429e 2150 unsigned int size;
c5e20cb7 2151 u64 seg_end, req_start, seg_left;
0f9c429e
WAA		 2152
2153 size = nfs_generic_pg_test(pgio, prev, req);
0f9c429e
WAA		 2154 if (!size)
2155 return 0;
94ad1c80 2156
19982ba8 2157 /*
c5e20cb7
WAA		 2158 * 'size' contains the number of bytes left in the current page (up
2159 * to the original size asked for in @req->wb_bytes).
2160 *
2161 * Calculate how many bytes are left in the layout segment
2162 * and if there are less bytes than 'size', return that instead.
19982ba8
TM		 2163 *
2164 * Please also note that 'end_offset' is actually the offset of the
2165 * first byte that lies outside the pnfs_layout_range. FIXME?
2166 *
2167 */
19b54848 2168 if (pgio->pg_lseg) {
17822b20 2169 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
c5e20cb7
WAA		 2170 pgio->pg_lseg->pls_range.length);
2171 req_start = req_offset(req);
08cb5b0f 2172
c5e20cb7 2173 /* start of request is past the last byte of this segment */
08cb5b0f 2174 if (req_start >= seg_end)
19b54848 2175 return 0;
c5e20cb7
WAA		 2176
2177 /* adjust 'size' iff there are fewer bytes left in the
2178 * segment than what nfs_generic_pg_test returned */
2179 seg_left = seg_end - req_start;
2180 if (seg_left < size)
2181 size = (unsigned int)seg_left;
19b54848 2182 }
0f9c429e 2183
19b54848 2184 return size;
94ad1c80 2185}
89a58e32 2186EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
94ad1c80 2187
53113ad3 2188int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
e2fecb21
TM		 2189{
2190 struct nfs_pageio_descriptor pgio;
e2fecb21
TM		 2191
2192 /* Resend all requests through the MDS */
53113ad3
WAA		 2193 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2194 hdr->completion_ops);
c7070113 2195 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
53113ad3 2196 return nfs_pageio_resend(&pgio, hdr);
e2fecb21 2197}
e7dd79af 2198EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
e2fecb21 2199
d45f60c6 2200static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1acbbb4e 2201{
cd841605
FI		 2202
2203 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2204 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1acbbb4e 2205 PNFS_LAYOUTRET_ON_ERROR) {
cd841605 2206 pnfs_return_layout(hdr->inode);
1acbbb4e 2207 }
6c75dc0d 2208 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
53113ad3 2209 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1acbbb4e
FI		 2210}
2211
d20581aa
BH		 2212/*
2213 * Called by non rpc-based layout drivers
2214 */
d45f60c6 2215void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
44b83799 2216{
f8417b48 2217 if (likely(!hdr->pnfs_error)) {
67af7611
TM		 2218 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2219 hdr->mds_offset + hdr->res.count);
d45f60c6 2220 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
f8417b48
KM		 2221 }
2222 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2223 if (unlikely(hdr->pnfs_error))
d45f60c6
WAA		 2224 pnfs_ld_handle_write_error(hdr);
2225 hdr->mds_ops->rpc_release(hdr);
44b83799 2226}
d20581aa 2227EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
44b83799 2228
dce81290
TM		 2229static void
2230pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
d45f60c6 2231 struct nfs_pgio_header *hdr)
dce81290 2232{
48d635f1 2233 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
a7d42ddb 2234
6c75dc0d 2235 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
a7d42ddb 2236 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
6c75dc0d 2237 nfs_pageio_reset_write_mds(desc);
a7d42ddb 2238 mirror->pg_recoalesce = 1;
6c75dc0d 2239 }
1ca018d2 2240 hdr->release(hdr);
dce81290
TM		 2241}
2242
2243static enum pnfs_try_status
d45f60c6 2244pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
dce81290
TM		 2245 const struct rpc_call_ops *call_ops,
2246 struct pnfs_layout_segment *lseg,
2247 int how)
0382b744 2248{
cd841605 2249 struct inode *inode = hdr->inode;
0382b744
AA		 2250 enum pnfs_try_status trypnfs;
2251 struct nfs_server *nfss = NFS_SERVER(inode);
2252
cd841605 2253 hdr->mds_ops = call_ops;
0382b744
AA		 2254
2255 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
d45f60c6
WAA		 2256 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2257 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
6c75dc0d 2258 if (trypnfs != PNFS_NOT_ATTEMPTED)
0382b744 2259 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
0382b744
AA		 2260 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2261 return trypnfs;
2262}
2263
dce81290 2264static void
7f714720
WAA		 2265pnfs_do_write(struct nfs_pageio_descriptor *desc,
2266 struct nfs_pgio_header *hdr, int how)
dce81290 2267{
dce81290
TM		 2268 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2269 struct pnfs_layout_segment *lseg = desc->pg_lseg;
7f714720 2270 enum pnfs_try_status trypnfs;
dce81290 2271
d45f60c6 2272 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
37f8aa16
TM		 2273 switch (trypnfs) {
2274 case PNFS_NOT_ATTEMPTED:
d45f60c6 2275 pnfs_write_through_mds(desc, hdr);
37f8aa16
TM		 2276 case PNFS_ATTEMPTED:
2277 break;
2278 case PNFS_TRY_AGAIN:
2279 /* cleanup hdr and prepare to redo pnfs */
2280 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2281 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2282 list_splice_init(&hdr->pages, &mirror->pg_list);
2283 mirror->pg_recoalesce = 1;
2284 }
2285 hdr->mds_ops->rpc_release(hdr);
2286 }
dce81290
TM		 2287}
2288
6c75dc0d
FI		 2289static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2290{
9369a431 2291 pnfs_put_lseg(hdr->lseg);
1e7f3a48 2292 nfs_pgio_header_free(hdr);
6c75dc0d
FI		 2293}
2294
dce81290
TM		 2295int
2296pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2297{
6c75dc0d 2298 struct nfs_pgio_header *hdr;
dce81290
TM		 2299 int ret;
2300
1e7f3a48
WAA		 2301 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2302 if (!hdr) {
2bff2288
PT		 2303 desc->pg_error = -ENOMEM;
2304 return desc->pg_error;
dce81290 2305 }
6c75dc0d 2306 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
180bb5ec 2307
9369a431 2308 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
ef2c488c 2309 ret = nfs_generic_pgio(desc, hdr);
180bb5ec 2310 if (!ret)
7f714720 2311 pnfs_do_write(desc, hdr, desc->pg_ioflags);
a7d42ddb 2312
6c75dc0d 2313 return ret;
dce81290
TM		 2314}
2315EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2316
53113ad3 2317int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
62e4a769
TM		 2318{
2319 struct nfs_pageio_descriptor pgio;
2320
1acbbb4e 2321 /* Resend all requests through the MDS */
53113ad3
WAA		 2322 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2323 return nfs_pageio_resend(&pgio, hdr);
1acbbb4e 2324}
e7dd79af 2325EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1acbbb4e 2326
d45f60c6 2327static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
1acbbb4e 2328{
cd841605
FI		 2329 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2330 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1acbbb4e 2331 PNFS_LAYOUTRET_ON_ERROR) {
cd841605 2332 pnfs_return_layout(hdr->inode);
1acbbb4e 2333 }
4db6e0b7 2334 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
53113ad3 2335 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
62e4a769
TM		 2336}
2337
d20581aa
BH		 2338/*
2339 * Called by non rpc-based layout drivers
2340 */
d45f60c6 2341void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
d20581aa 2342{
bfc505de 2343 if (likely(!hdr->pnfs_error))
d45f60c6 2344 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
f8417b48
KM		 2345 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2346 if (unlikely(hdr->pnfs_error))
d45f60c6
WAA		 2347 pnfs_ld_handle_read_error(hdr);
2348 hdr->mds_ops->rpc_release(hdr);
d20581aa
BH		 2349}
2350EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2351
493292dd
TM		 2352static void
2353pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
d45f60c6 2354 struct nfs_pgio_header *hdr)
493292dd 2355{
48d635f1 2356 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
a7d42ddb 2357
4db6e0b7 2358 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
a7d42ddb 2359 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
4db6e0b7 2360 nfs_pageio_reset_read_mds(desc);
a7d42ddb 2361 mirror->pg_recoalesce = 1;
4db6e0b7 2362 }
1ca018d2 2363 hdr->release(hdr);
493292dd
TM		 2364}
2365
64419a9b
AA		 2366/*
2367 * Call the appropriate parallel I/O subsystem read function.
2368 */
493292dd 2369static enum pnfs_try_status
d45f60c6 2370pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
493292dd
TM		 2371 const struct rpc_call_ops *call_ops,
2372 struct pnfs_layout_segment *lseg)
64419a9b 2373{
cd841605 2374 struct inode *inode = hdr->inode;
64419a9b
AA		 2375 struct nfs_server *nfss = NFS_SERVER(inode);
2376 enum pnfs_try_status trypnfs;
2377
cd841605 2378 hdr->mds_ops = call_ops;
64419a9b
AA		 2379
2380 dprintk("%s: Reading ino:%lu %u@%llu\n",
d45f60c6 2381 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
64419a9b 2382
d45f60c6 2383 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
4db6e0b7 2384 if (trypnfs != PNFS_NOT_ATTEMPTED)
64419a9b 2385 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
64419a9b
AA		 2386 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2387 return trypnfs;
2388}
863a3c6c 2389
ceb11e13 2390/* Resend all requests through pnfs. */
1b1bc66b 2391void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
ceb11e13
PT		 2392{
2393 struct nfs_pageio_descriptor pgio;
2394
1b1bc66b 2395 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
54e4a0df
TM		 2396 /* Prevent deadlocks with layoutreturn! */
2397 pnfs_put_lseg(hdr->lseg);
2398 hdr->lseg = NULL;
2399
1b1bc66b
WAA		 2400 nfs_pageio_init_read(&pgio, hdr->inode, false,
2401 hdr->completion_ops);
2402 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2403 }
ceb11e13
PT		 2404}
2405EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2406
493292dd 2407static void
7f714720 2408pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
493292dd 2409{
493292dd
TM		 2410 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2411 struct pnfs_layout_segment *lseg = desc->pg_lseg;
7f714720 2412 enum pnfs_try_status trypnfs;
493292dd 2413
d45f60c6 2414 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
6aeafd05
TM		 2415 switch (trypnfs) {
2416 case PNFS_NOT_ATTEMPTED:
d45f60c6 2417 pnfs_read_through_mds(desc, hdr);
6aeafd05
TM		 2418 case PNFS_ATTEMPTED:
2419 break;
2420 case PNFS_TRY_AGAIN:
2421 /* cleanup hdr and prepare to redo pnfs */
2422 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2423 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2424 list_splice_init(&hdr->pages, &mirror->pg_list);
2425 mirror->pg_recoalesce = 1;
2426 }
2427 hdr->mds_ops->rpc_release(hdr);
2428 }
493292dd
TM		 2429}
2430
4db6e0b7
FI		 2431static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2432{
9369a431 2433 pnfs_put_lseg(hdr->lseg);
1e7f3a48 2434 nfs_pgio_header_free(hdr);
4db6e0b7
FI		 2435}
2436
493292dd
TM		 2437int
2438pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2439{
4db6e0b7 2440 struct nfs_pgio_header *hdr;
493292dd
TM		 2441 int ret;
2442
1e7f3a48
WAA		 2443 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2444 if (!hdr) {
2bff2288
PT		 2445 desc->pg_error = -ENOMEM;
2446 return desc->pg_error;
493292dd 2447 }
4db6e0b7 2448 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
9369a431 2449 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
ef2c488c 2450 ret = nfs_generic_pgio(desc, hdr);
180bb5ec 2451 if (!ret)
7f714720 2452 pnfs_do_read(desc, hdr);
4db6e0b7 2453 return ret;
493292dd
TM		 2454}
2455EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2456
71244d9b
TM		 2457static void pnfs_clear_layoutcommitting(struct inode *inode)
2458{
2459 unsigned long *bitlock = &NFS_I(inode)->flags;
2460
2461 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
4e857c58 2462 smp_mb__after_atomic();
71244d9b
TM		 2463 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2464}
2465
863a3c6c 2466/*
a9bae566 2467 * There can be multiple RW segments.
863a3c6c 2468 */
a9bae566 2469static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
863a3c6c 2470{
a9bae566 2471 struct pnfs_layout_segment *lseg;
863a3c6c 2472
a9bae566
PT		 2473 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2474 if (lseg->pls_range.iomode == IOMODE_RW &&
a073dbff 2475 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
a9bae566
PT		 2476 list_add(&lseg->pls_lc_list, listp);
2477 }
863a3c6c
AA		 2478}
2479
a073dbff
TM		 2480static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2481{
2482 struct pnfs_layout_segment *lseg, *tmp;
a073dbff
TM		 2483
2484 /* Matched by references in pnfs_set_layoutcommit */
2485 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2486 list_del_init(&lseg->pls_lc_list);
2487 pnfs_put_lseg(lseg);
2488 }
2489
71244d9b 2490 pnfs_clear_layoutcommitting(inode);
a073dbff
TM		 2491}
2492
1b0ae068
PT		 2493void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2494{
b9e028fd 2495 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
1b0ae068
PT		 2496}
2497EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2498
863a3c6c 2499void
67af7611
TM		 2500pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2501 loff_t end_pos)
863a3c6c 2502{
cd841605 2503 struct nfs_inode *nfsi = NFS_I(inode);
79a48a1f 2504 bool mark_as_dirty = false;
863a3c6c 2505
cd841605 2506 spin_lock(&inode->i_lock);
863a3c6c 2507 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
29559b11 2508 nfsi->layout->plh_lwb = end_pos;
79a48a1f 2509 mark_as_dirty = true;
863a3c6c 2510 dprintk("%s: Set layoutcommit for inode %lu ",
cd841605 2511 __func__, inode->i_ino);
29559b11
TM		 2512 } else if (end_pos > nfsi->layout->plh_lwb)
2513 nfsi->layout->plh_lwb = end_pos;
67af7611 2514 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
a9bae566 2515 /* references matched in nfs4_layoutcommit_release */
67af7611 2516 pnfs_get_lseg(lseg);
a9bae566 2517 }
cd841605 2518 spin_unlock(&inode->i_lock);
acff5880 2519 dprintk("%s: lseg %p end_pos %llu\n",
67af7611 2520 __func__, lseg, nfsi->layout->plh_lwb);
79a48a1f
WAA		 2521
2522 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2523 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2524 if (mark_as_dirty)
cd841605 2525 mark_inode_dirty_sync(inode);
863a3c6c
AA		 2526}
2527EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2528
db29c089
AA		 2529void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2530{
2531 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2532
2533 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2534 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
a073dbff 2535 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
db29c089
AA		 2536}
2537
de4b15c7
AA		 2538/*
2539 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2540 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2541 * data to disk to allow the server to recover the data if it crashes.
2542 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2543 * is off, and a COMMIT is sent to a data server, or
2544 * if WRITEs to a data server return NFS_DATA_SYNC.
2545 */
863a3c6c 2546int
ef311537 2547pnfs_layoutcommit_inode(struct inode *inode, bool sync)
863a3c6c 2548{
5f919c9f 2549 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
863a3c6c
AA		 2550 struct nfs4_layoutcommit_data *data;
2551 struct nfs_inode *nfsi = NFS_I(inode);
863a3c6c 2552 loff_t end_pos;
71244d9b 2553 int status;
863a3c6c 2554
71244d9b 2555 if (!pnfs_layoutcommit_outstanding(inode))
de4b15c7
AA		 2556 return 0;
2557
71244d9b 2558 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
92407e75 2559
71244d9b 2560 status = -EAGAIN;
92407e75 2561 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
71244d9b
TM		 2562 if (!sync)
2563 goto out;
74316201 2564 status = wait_on_bit_lock_action(&nfsi->flags,
71244d9b
TM		 2565 NFS_INO_LAYOUTCOMMITTING,
2566 nfs_wait_bit_killable,
2567 TASK_KILLABLE);
92407e75 2568 if (status)
71244d9b 2569 goto out;
92407e75
PT		 2570 }
2571
71244d9b
TM		 2572 status = -ENOMEM;
2573 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2574 data = kzalloc(sizeof(*data), GFP_NOFS);
2575 if (!data)
2576 goto clear_layoutcommitting;
2577
2578 status = 0;
de4b15c7 2579 spin_lock(&inode->i_lock);
71244d9b
TM		 2580 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2581 goto out_unlock;
a9bae566 2582
71244d9b 2583 INIT_LIST_HEAD(&data->lseg_list);
a9bae566 2584 pnfs_list_write_lseg(inode, &data->lseg_list);
863a3c6c 2585
acff5880 2586 end_pos = nfsi->layout->plh_lwb;
863a3c6c 2587
f597c537 2588 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
863a3c6c
AA		 2589 spin_unlock(&inode->i_lock);
2590
2591 data->args.inode = inode;
9fa40758 2592 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
863a3c6c
AA		 2593 nfs_fattr_init(&data->fattr);
2594 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2595 data->res.fattr = &data->fattr;
2e18d4d8
TM		 2596 if (end_pos != 0)
2597 data->args.lastbytewritten = end_pos - 1;
2598 else
2599 data->args.lastbytewritten = U64_MAX;
863a3c6c
AA		 2600 data->res.server = NFS_SERVER(inode);
2601
5f919c9f
CH		 2602 if (ld->prepare_layoutcommit) {
2603 status = ld->prepare_layoutcommit(&data->args);
2604 if (status) {
3471648a 2605 put_rpccred(data->cred);
5f919c9f 2606 spin_lock(&inode->i_lock);
29559b11
TM		 2607 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2608 if (end_pos > nfsi->layout->plh_lwb)
5f919c9f 2609 nfsi->layout->plh_lwb = end_pos;
3471648a 2610 goto out_unlock;
5f919c9f
CH		 2611 }
2612 }
2613
2614
863a3c6c
AA		 2615 status = nfs4_proc_layoutcommit(data, sync);
2616out:
92407e75
PT		 2617 if (status)
2618 mark_inode_dirty_sync(inode);
863a3c6c
AA		 2619 dprintk("<-- %s status %d\n", __func__, status);
2620 return status;
71244d9b
TM		 2621out_unlock:
2622 spin_unlock(&inode->i_lock);
92407e75 2623 kfree(data);
71244d9b
TM		 2624clear_layoutcommitting:
2625 pnfs_clear_layoutcommitting(inode);
92407e75 2626 goto out;
863a3c6c 2627}
72cff449 2628EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
82be417a 2629
5bb89b47
TM		 2630int
2631pnfs_generic_sync(struct inode *inode, bool datasync)
2632{
2633 return pnfs_layoutcommit_inode(inode, true);
2634}
2635EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2636
82be417a
AA		 2637struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2638{
2639 struct nfs4_threshold *thp;
2640
2641 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2642 if (!thp) {
2643 dprintk("%s mdsthreshold allocation failed\n", __func__);
2644 return NULL;
2645 }
2646 return thp;
2647}
8733408d 2648
865a7ecb 2649#if IS_ENABLED(CONFIG_NFS_V4_2)
8733408d 2650int
c8ad8894 2651pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
8733408d
PT		 2652{
2653 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2654 struct nfs_server *server = NFS_SERVER(inode);
1bfe3b25 2655 struct nfs_inode *nfsi = NFS_I(inode);
8733408d
PT		 2656 struct nfs42_layoutstat_data *data;
2657 struct pnfs_layout_hdr *hdr;
2658 int status = 0;
2659
2660 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2661 goto out;
2662
6c5a0d89
TM		 2663 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2664 goto out;
2665
1bfe3b25
PT		 2666 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2667 goto out;
2668
8733408d
PT		 2669 spin_lock(&inode->i_lock);
2670 if (!NFS_I(inode)->layout) {
2671 spin_unlock(&inode->i_lock);
f538d0ba 2672 goto out_clear_layoutstats;
8733408d
PT		 2673 }
2674 hdr = NFS_I(inode)->layout;
2675 pnfs_get_layout_hdr(hdr);
2676 spin_unlock(&inode->i_lock);
2677
c8ad8894 2678 data = kzalloc(sizeof(*data), gfp_flags);
8733408d
PT		 2679 if (!data) {
2680 status = -ENOMEM;
2681 goto out_put;
2682 }
2683
2684 data->args.fh = NFS_FH(inode);
2685 data->args.inode = inode;
8733408d
PT		 2686 status = ld->prepare_layoutstats(&data->args);
2687 if (status)
2688 goto out_free;
2689
2690 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2691
2692out:
2693 dprintk("%s returns %d\n", __func__, status);
2694 return status;
2695
2696out_free:
2697 kfree(data);
2698out_put:
2699 pnfs_put_layout_hdr(hdr);
f538d0ba 2700out_clear_layoutstats:
1bfe3b25
PT		 2701 smp_mb__before_atomic();
2702 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2703 smp_mb__after_atomic();
8733408d
PT		 2704 goto out;
2705}
2706EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
865a7ecb 2707#endif
bbf58bf3
TM		 2708
2709unsigned int layoutstats_timer;
2710module_param(layoutstats_timer, uint, 0644);
2711EXPORT_SYMBOL_GPL(layoutstats_timer);
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