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NFS: Fix another fsync() issue after a server reboot
[linux-block.git] / fs / nfs / pnfs.c
CommitLineData
85e174ba
RL		 1/*
2 * pNFS functions to call and manage layout drivers.
3 *
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#include <linux/nfs_fs.h>
493292dd 31#include <linux/nfs_page.h>
143cb494 32#include <linux/module.h>
ca440c38 33#include <linux/sort.h>
974cec8c 34#include "internal.h"
85e174ba 35#include "pnfs.h"
64419a9b 36#include "iostat.h"
cc668ab3 37#include "nfs4trace.h"
40dd4b7a 38#include "delegation.h"
8733408d 39#include "nfs42.h"
1b146fcf 40#include "nfs4_fs.h"
85e174ba
RL		 41
42#define NFSDBG_FACILITY NFSDBG_PNFS
25c75333 43#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
85e174ba 44
02c35fca
FI		 45/* Locking:
46 *
47 * pnfs_spinlock:
48 * protects pnfs_modules_tbl.
49 */
50static DEFINE_SPINLOCK(pnfs_spinlock);
51
52/*
53 * pnfs_modules_tbl holds all pnfs modules
54 */
55static LIST_HEAD(pnfs_modules_tbl);
56
13c13a6a 57static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
68f74479
TM		 58static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
59 struct list_head *free_me,
60 const struct pnfs_layout_range *range,
61 u32 seq);
fe1cf946
TM		 62static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
63 struct list_head *tmp_list);
aa1e0e3a 64
02c35fca
FI		 65/* Return the registered pnfs layout driver module matching given id */
66static struct pnfs_layoutdriver_type *
67find_pnfs_driver_locked(u32 id)
68{
69 struct pnfs_layoutdriver_type *local;
70
71 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
72 if (local->id == id)
73 goto out;
74 local = NULL;
75out:
76 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
77 return local;
78}
79
85e174ba
RL		 80static struct pnfs_layoutdriver_type *
81find_pnfs_driver(u32 id)
82{
02c35fca
FI		 83 struct pnfs_layoutdriver_type *local;
84
85 spin_lock(&pnfs_spinlock);
86 local = find_pnfs_driver_locked(id);
0a9c63fa
TM		 87 if (local != NULL && !try_module_get(local->owner)) {
88 dprintk("%s: Could not grab reference on module\n", __func__);
89 local = NULL;
90 }
02c35fca
FI		 91 spin_unlock(&pnfs_spinlock);
92 return local;
85e174ba
RL		 93}
94
7c9d845f
TM		 95const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id)
96{
97 return find_pnfs_driver(id);
98}
99
100void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld)
101{
102 if (ld)
103 module_put(ld->owner);
104}
105
85e174ba
RL		 106void
107unset_pnfs_layoutdriver(struct nfs_server *nfss)
108{
738fd0f3
BH		 109 if (nfss->pnfs_curr_ld) {
110 if (nfss->pnfs_curr_ld->clear_layoutdriver)
111 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
2a4c8994
TM		 112 /* Decrement the MDS count. Purge the deviceid cache if zero */
113 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
114 nfs4_deviceid_purge_client(nfss->nfs_client);
02c35fca 115 module_put(nfss->pnfs_curr_ld->owner);
738fd0f3 116 }
85e174ba
RL		 117 nfss->pnfs_curr_ld = NULL;
118}
119
ca440c38
JL		 120/*
121 * When the server sends a list of layout types, we choose one in the order
122 * given in the list below.
123 *
124 * FIXME: should this list be configurable in some fashion? module param?
125 * mount option? something else?
126 */
127static const u32 ld_prefs[] = {
128 LAYOUT_SCSI,
129 LAYOUT_BLOCK_VOLUME,
130 LAYOUT_OSD2_OBJECTS,
131 LAYOUT_FLEX_FILES,
132 LAYOUT_NFSV4_1_FILES,
133 0
134};
135
136static int
137ld_cmp(const void *e1, const void *e2)
138{
139 u32 ld1 = *((u32 *)e1);
140 u32 ld2 = *((u32 *)e2);
141 int i;
142
143 for (i = 0; ld_prefs[i] != 0; i++) {
144 if (ld1 == ld_prefs[i])
145 return -1;
146
147 if (ld2 == ld_prefs[i])
148 return 1;
149 }
150 return 0;
151}
152
85e174ba
RL		 153/*
154 * Try to set the server's pnfs module to the pnfs layout type specified by id.
155 * Currently only one pNFS layout driver per filesystem is supported.
156 *
3132e49e 157 * @ids array of layout types supported by MDS.
85e174ba
RL		 158 */
159void
738fd0f3 160set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
ca440c38 161 struct nfs_fsinfo *fsinfo)
85e174ba
RL		 162{
163 struct pnfs_layoutdriver_type *ld_type = NULL;
3132e49e 164 u32 id;
ca440c38 165 int i;
85e174ba 166
19274716
AS		 167 if (fsinfo->nlayouttypes == 0)
168 goto out_no_driver;
85e174ba
RL		 169 if (!(server->nfs_client->cl_exchange_flags &
170 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
3132e49e
JL		 171 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
172 __func__, server->nfs_client->cl_exchange_flags);
85e174ba
RL		 173 goto out_no_driver;
174 }
3132e49e 175
ca440c38
JL		 176 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
177 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
3132e49e 178
ca440c38
JL		 179 for (i = 0; i < fsinfo->nlayouttypes; i++) {
180 id = fsinfo->layouttype[i];
85e174ba 181 ld_type = find_pnfs_driver(id);
ca440c38
JL		 182 if (!ld_type) {
183 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
184 id);
185 ld_type = find_pnfs_driver(id);
186 }
187 if (ld_type)
188 break;
85e174ba 189 }
3132e49e
JL		 190
191 if (!ld_type) {
ca440c38 192 dprintk("%s: No pNFS module found!\n", __func__);
3132e49e
JL		 193 goto out_no_driver;
194 }
195
85e174ba 196 server->pnfs_curr_ld = ld_type;
738fd0f3
BH		 197 if (ld_type->set_layoutdriver
198 && ld_type->set_layoutdriver(server, mntfh)) {
a030889a
WAA		 199 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
200 "driver %u.\n", __func__, id);
738fd0f3
BH		 201 module_put(ld_type->owner);
202 goto out_no_driver;
203 }
2a4c8994
TM		 204 /* Bump the MDS count */
205 atomic_inc(&server->nfs_client->cl_mds_count);
ea8eecdd 206
85e174ba
RL		 207 dprintk("%s: pNFS module for %u set\n", __func__, id);
208 return;
209
210out_no_driver:
211 dprintk("%s: Using NFSv4 I/O\n", __func__);
212 server->pnfs_curr_ld = NULL;
213}
02c35fca
FI		 214
215int
216pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
217{
218 int status = -EINVAL;
219 struct pnfs_layoutdriver_type *tmp;
220
221 if (ld_type->id == 0) {
a030889a 222 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
02c35fca
FI		 223 return status;
224 }
b1f69b75 225 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
a030889a 226 printk(KERN_ERR "NFS: %s Layout driver must provide "
b1f69b75
AA		 227 "alloc_lseg and free_lseg.\n", __func__);
228 return status;
229 }
02c35fca
FI		 230
231 spin_lock(&pnfs_spinlock);
232 tmp = find_pnfs_driver_locked(ld_type->id);
233 if (!tmp) {
234 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
235 status = 0;
236 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
237 ld_type->name);
238 } else {
a030889a 239 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
02c35fca
FI		 240 __func__, ld_type->id);
241 }
242 spin_unlock(&pnfs_spinlock);
243
244 return status;
245}
246EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
247
248void
249pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
250{
251 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
252 spin_lock(&pnfs_spinlock);
253 list_del(&ld_type->pnfs_tblid);
254 spin_unlock(&pnfs_spinlock);
255}
256EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
e5e94017 257
b1f69b75
AA		 258/*
259 * pNFS client layout cache
260 */
261
cc6e5340 262/* Need to hold i_lock if caller does not already hold reference */
43f1b3da 263void
70c3bd2b 264pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
e5e94017 265{
2b28a7be 266 refcount_inc(&lo->plh_refcount);
e5e94017
BH		 267}
268
636fb9c8
BH		 269static struct pnfs_layout_hdr *
270pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
271{
272 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
57934278 273 return ld->alloc_layout_hdr(ino, gfp_flags);
636fb9c8
BH		 274}
275
276static void
277pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
278{
9c626381
TM		 279 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
280 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
281
cf6605d1 282 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
9c626381
TM		 283 struct nfs_client *clp = server->nfs_client;
284
285 spin_lock(&clp->cl_lock);
cf6605d1 286 list_del_rcu(&lo->plh_layouts);
9c626381
TM		 287 spin_unlock(&clp->cl_lock);
288 }
a52458b4 289 put_cred(lo->plh_lc_cred);
57934278 290 return ld->free_layout_hdr(lo);
636fb9c8
BH		 291}
292
e5e94017 293static void
6622c3ea 294pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
e5e94017 295{
bb346f63 296 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
cc6e5340 297 dprintk("%s: freeing layout cache %p\n", __func__, lo);
bb346f63
TM		 298 nfsi->layout = NULL;
299 /* Reset MDS Threshold I/O counters */
300 nfsi->write_io = 0;
301 nfsi->read_io = 0;
e5e94017
BH		 302}
303
b1f69b75 304void
70c3bd2b 305pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
974cec8c 306{
9c6376eb 307 struct inode *inode;
b6d49ecd 308 unsigned long i_state;
cc6e5340 309
9c6376eb
TM		 310 if (!lo)
311 return;
312 inode = lo->plh_inode;
13c13a6a
TM		 313 pnfs_layoutreturn_before_put_layout_hdr(lo);
314
2b28a7be 315 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
566f8737
PT		 316 if (!list_empty(&lo->plh_segs))
317 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
6622c3ea 318 pnfs_detach_layout_hdr(lo);
b6d49ecd 319 i_state = inode->i_state;
cc6e5340 320 spin_unlock(&inode->i_lock);
6622c3ea 321 pnfs_free_layout_hdr(lo);
b6d49ecd
TM		 322 /* Notify pnfs_destroy_layout_final() that we're done */
323 if (i_state & (I_FREEING | I_CLEAR))
324 wake_up_var(lo);
cc6e5340 325 }
974cec8c
AA		 326}
327
b5fdf841
TM		 328static struct inode *
329pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo)
330{
331 struct inode *inode = igrab(lo->plh_inode);
332 if (inode)
333 return inode;
334 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
335 return NULL;
336}
337
1bcf34fd
TM		 338/*
339 * Compare 2 layout stateid sequence ids, to see which is newer,
340 * taking into account wraparound issues.
341 */
342static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
343{
344 return (s32)(s1 - s2) > 0;
345}
346
347static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq)
348{
45baadaa 349 if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier)
1bcf34fd
TM		 350 lo->plh_barrier = newseq;
351}
352
4aab9732
TM		 353static void
354pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
355 u32 seq)
356{
357 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
358 iomode = IOMODE_ANY;
359 lo->plh_return_iomode = iomode;
360 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
e20772cb
TM		 361 /*
362 * We must set lo->plh_return_seq to avoid livelocks with
363 * pnfs_layout_need_return()
364 */
365 if (seq == 0)
366 seq = be32_to_cpu(lo->plh_stateid.seqid);
367 if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
4aab9732 368 lo->plh_return_seq = seq;
e20772cb 369 pnfs_barrier_update(lo, seq);
4aab9732
TM		 370}
371
ae5a459d
TM		 372static void
373pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
374{
5466d214 375 struct pnfs_layout_segment *lseg;
ae5a459d
TM		 376 lo->plh_return_iomode = 0;
377 lo->plh_return_seq = 0;
378 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
5466d214
TM		 379 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
380 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
381 continue;
382 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
383 }
ae5a459d
TM		 384}
385
362fb578
TM		 386static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
387{
388 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
389 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
390 smp_mb__after_atomic();
391 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
392 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
393}
394
fe1cf946
TM		 395static void
396pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
397 struct list_head *free_me)
398{
399 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
400 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
401 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
402 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
403 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
404 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
405}
406
7380020e 407/*
30cb3ee2
TM		 408 * Update the seqid of a layout stateid after receiving
409 * NFS4ERR_OLD_STATEID
7380020e 410 */
30cb3ee2 411bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
ecf84026
TM		 412 struct pnfs_layout_range *dst_range,
413 struct inode *inode)
7380020e
TM		 414{
415 struct pnfs_layout_hdr *lo;
c16467dc
TM		 416 struct pnfs_layout_range range = {
417 .iomode = IOMODE_ANY,
418 .offset = 0,
419 .length = NFS4_MAX_UINT64,
420 };
7380020e 421 bool ret = false;
c16467dc
TM		 422 LIST_HEAD(head);
423 int err;
7380020e
TM		 424
425 spin_lock(&inode->i_lock);
426 lo = NFS_I(inode)->layout;
30cb3ee2
TM		 427 if (lo && pnfs_layout_is_valid(lo) &&
428 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
429 /* Is our call using the most recent seqid? If so, bump it */
430 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
431 nfs4_stateid_seqid_inc(dst);
432 ret = true;
433 goto out;
434 }
435 /* Try to update the seqid to the most recent */
c16467dc
TM		 436 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
437 if (err != -EBUSY) {
438 dst->seqid = lo->plh_stateid.seqid;
ecf84026 439 *dst_range = range;
c16467dc
TM		 440 ret = true;
441 }
7380020e 442 }
30cb3ee2 443out:
7380020e 444 spin_unlock(&inode->i_lock);
c16467dc 445 pnfs_free_lseg_list(&head);
7380020e
TM		 446 return ret;
447}
448
2454dfea
TM		 449/*
450 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
451 *
452 * In order to continue using the pnfs_layout_hdr, a full recovery
453 * is required.
454 * Note that caller must hold inode->i_lock.
455 */
5f46be04 456int
2454dfea
TM		 457pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
458 struct list_head *lseg_list)
459{
460 struct pnfs_layout_range range = {
461 .iomode = IOMODE_ANY,
462 .offset = 0,
463 .length = NFS4_MAX_UINT64,
464 };
fe1cf946 465 struct pnfs_layout_segment *lseg, *next;
2454dfea
TM		 466
467 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
fe1cf946
TM		 468 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
469 pnfs_clear_lseg_state(lseg, lseg_list);
5466d214 470 pnfs_clear_layoutreturn_info(lo);
68f74479 471 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
880265c7 472 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
362fb578
TM		 473 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
474 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
475 pnfs_clear_layoutreturn_waitbit(lo);
fe1cf946 476 return !list_empty(&lo->plh_segs);
2454dfea
TM		 477}
478
b9e028fd
TM		 479static int
480pnfs_iomode_to_fail_bit(u32 iomode)
481{
482 return iomode == IOMODE_RW ?
483 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
484}
485
486static void
3e621214 487pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
b9e028fd 488{
25c75333 489 lo->plh_retry_timestamp = jiffies;
39e88fcf 490 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
2b28a7be 491 refcount_inc(&lo->plh_refcount);
3e621214
TM		 492}
493
494static void
495pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
496{
497 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
2b28a7be 498 refcount_dec(&lo->plh_refcount);
3e621214
TM		 499}
500
501static void
502pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
503{
504 struct inode *inode = lo->plh_inode;
115ce575
TM		 505 struct pnfs_layout_range range = {
506 .iomode = iomode,
507 .offset = 0,
508 .length = NFS4_MAX_UINT64,
509 };
510 LIST_HEAD(head);
3e621214
TM		 511
512 spin_lock(&inode->i_lock);
513 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
6d597e17 514 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
3e621214 515 spin_unlock(&inode->i_lock);
115ce575 516 pnfs_free_lseg_list(&head);
b9e028fd
TM		 517 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
518 iomode == IOMODE_RW ? "RW" : "READ");
519}
520
521static bool
522pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
523{
25c75333 524 unsigned long start, end;
3e621214
TM		 525 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
526
527 if (test_bit(fail_bit, &lo->plh_flags) == 0)
25c75333
TM		 528 return false;
529 end = jiffies;
530 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
531 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
532 /* It is time to retry the failed layoutgets */
3e621214 533 pnfs_layout_clear_fail_bit(lo, fail_bit);
25c75333
TM		 534 return false;
535 }
536 return true;
b9e028fd
TM		 537}
538
974cec8c 539static void
119cef97
TM		 540pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
541 const struct pnfs_layout_range *range,
542 const nfs4_stateid *stateid)
974cec8c 543{
566052c5 544 INIT_LIST_HEAD(&lseg->pls_list);
a9bae566 545 INIT_LIST_HEAD(&lseg->pls_lc_list);
a9901899 546 INIT_LIST_HEAD(&lseg->pls_commits);
eba6dd69 547 refcount_set(&lseg->pls_refcount, 1);
4541d16c 548 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
566052c5 549 lseg->pls_layout = lo;
119cef97
TM		 550 lseg->pls_range = *range;
551 lseg->pls_seq = be32_to_cpu(stateid->seqid);
974cec8c
AA		 552}
553
905ca191 554static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
974cec8c 555{
68f74479
TM		 556 if (lseg != NULL) {
557 struct inode *inode = lseg->pls_layout->plh_inode;
558 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
559 }
974cec8c
AA		 560}
561
d684d2ae 562static void
57036a37
TM		 563pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
564 struct pnfs_layout_segment *lseg)
d684d2ae 565{
d20581aa 566 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
d684d2ae 567 list_del_init(&lseg->pls_list);
8f0d27dc 568 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
2b28a7be 569 refcount_dec(&lo->plh_refcount);
abb3e1c8
TM		 570 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
571 return;
7b650994
TM		 572 if (list_empty(&lo->plh_segs) &&
573 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
574 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
334a8f37
TM		 575 if (atomic_read(&lo->plh_outstanding) == 0)
576 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
173f77e9 577 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
2d148c7e 578 }
d684d2ae
FI		 579}
580
68f74479
TM		 581static bool
582pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
583 struct pnfs_layout_segment *lseg)
584{
585 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
586 pnfs_layout_is_valid(lo)) {
4aab9732 587 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
68f74479
TM		 588 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
589 return true;
590 }
591 return false;
592}
593
bae724ef 594void
9369a431 595pnfs_put_lseg(struct pnfs_layout_segment *lseg)
974cec8c 596{
57036a37 597 struct pnfs_layout_hdr *lo;
d684d2ae
FI		 598 struct inode *inode;
599
600 if (!lseg)
601 return;
602
4541d16c 603 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
eba6dd69 604 refcount_read(&lseg->pls_refcount),
4541d16c 605 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
4ef2e4f8 606
57036a37
TM		 607 lo = lseg->pls_layout;
608 inode = lo->plh_inode;
4ef2e4f8 609
eba6dd69 610 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
8f0d27dc 611 pnfs_get_layout_hdr(lo);
4ef2e4f8 612 pnfs_layout_remove_lseg(lo, lseg);
68f74479
TM		 613 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
614 lseg = NULL;
4ef2e4f8
TM		 615 spin_unlock(&inode->i_lock);
616 pnfs_free_lseg(lseg);
617 pnfs_put_layout_hdr(lo);
4541d16c 618 }
4541d16c 619}
9369a431 620EXPORT_SYMBOL_GPL(pnfs_put_lseg);
974cec8c 621
fb3296eb
BH		 622/*
623 * is l2 fully contained in l1?
624 * start1 end1
625 * [----------------------------------)
626 * start2 end2
627 * [----------------)
628 */
3cb2df17 629static bool
7dc0ac70 630pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
3cb2df17 631 const struct pnfs_layout_range *l2)
fb3296eb
BH		 632{
633 u64 start1 = l1->offset;
17822b20 634 u64 end1 = pnfs_end_offset(start1, l1->length);
fb3296eb 635 u64 start2 = l2->offset;
17822b20 636 u64 end2 = pnfs_end_offset(start2, l2->length);
fb3296eb
BH		 637
638 return (start1 <= start2) && (end1 >= end2);
639}
640
24956804
TM		 641static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
642 struct list_head *tmp_list)
643{
eba6dd69 644 if (!refcount_dec_and_test(&lseg->pls_refcount))
24956804
TM		 645 return false;
646 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
647 list_add(&lseg->pls_list, tmp_list);
648 return true;
649}
650
4541d16c
FI		 651/* Returns 1 if lseg is removed from list, 0 otherwise */
652static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
653 struct list_head *tmp_list)
654{
655 int rv = 0;
656
657 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
658 /* Remove the reference keeping the lseg in the
659 * list. It will now be removed when all
660 * outstanding io is finished.
661 */
d684d2ae 662 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
eba6dd69 663 refcount_read(&lseg->pls_refcount));
24956804 664 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
d684d2ae 665 rv = 1;
4541d16c
FI		 666 }
667 return rv;
668}
669
e036f464
TM		 670static bool
671pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
672 const struct pnfs_layout_range *recall_range)
673{
674 return (recall_range->iomode == IOMODE_ANY ||
675 lseg_range->iomode == recall_range->iomode) &&
676 pnfs_lseg_range_intersecting(lseg_range, recall_range);
677}
678
679static bool
680pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
681 const struct pnfs_layout_range *recall_range,
682 u32 seq)
683{
684 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
685 return false;
686 if (recall_range == NULL)
687 return true;
688 return pnfs_should_free_range(&lseg->pls_range, recall_range);
689}
690
6d597e17
JL		 691/**
692 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
693 * @lo: layout header containing the lsegs
694 * @tmp_list: list head where doomed lsegs should go
695 * @recall_range: optional recall range argument to match (may be NULL)
696 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
697 *
698 * Walk the list of lsegs in the layout header, and tear down any that should
699 * be destroyed. If "recall_range" is specified then the segment must match
700 * that range. If "seq" is non-zero, then only match segments that were handed
701 * out at or before that sequence.
702 *
703 * Returns number of matching invalid lsegs remaining in list after scanning
704 * it and purging them.
4541d16c 705 */
43f1b3da 706int
49a85061 707pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
4541d16c 708 struct list_head *tmp_list,
6d597e17
JL		 709 const struct pnfs_layout_range *recall_range,
710 u32 seq)
974cec8c
AA		 711{
712 struct pnfs_layout_segment *lseg, *next;
71b39854 713 int remaining = 0;
974cec8c
AA		 714
715 dprintk("%s:Begin lo %p\n", __func__, lo);
716
8006bfba 717 if (list_empty(&lo->plh_segs))
38511722 718 return 0;
4541d16c 719 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
e036f464 720 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
b3dce6a2 721 dprintk("%s: freeing lseg %p iomode %d seq %u "
4541d16c 722 "offset %llu length %llu\n", __func__,
6d597e17
JL		 723 lseg, lseg->pls_range.iomode, lseg->pls_seq,
724 lseg->pls_range.offset, lseg->pls_range.length);
71b39854
TM		 725 if (!mark_lseg_invalid(lseg, tmp_list))
726 remaining++;
4541d16c 727 }
71b39854
TM		 728 dprintk("%s:Return %i\n", __func__, remaining);
729 return remaining;
974cec8c
AA		 730}
731
68f74479
TM		 732static void
733pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
734 struct list_head *free_me,
735 const struct pnfs_layout_range *range,
736 u32 seq)
737{
738 struct pnfs_layout_segment *lseg, *next;
739
740 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
741 if (pnfs_match_lseg_recall(lseg, range, seq))
742 list_move_tail(&lseg->pls_list, free_me);
743 }
744}
745
f49f9baa 746/* note free_me must contain lsegs from a single layout_hdr */
43f1b3da 747void
4541d16c 748pnfs_free_lseg_list(struct list_head *free_me)
974cec8c 749{
4541d16c 750 struct pnfs_layout_segment *lseg, *tmp;
f49f9baa
FI		 751
752 if (list_empty(free_me))
753 return;
754
4541d16c 755 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
566052c5 756 list_del(&lseg->pls_list);
905ca191 757 pnfs_free_lseg(lseg);
974cec8c
AA		 758 }
759}
760
b6d49ecd 761static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi)
e5e94017
BH		 762{
763 struct pnfs_layout_hdr *lo;
974cec8c 764 LIST_HEAD(tmp_list);
e5e94017
BH		 765
766 spin_lock(&nfsi->vfs_inode.i_lock);
767 lo = nfsi->layout;
768 if (lo) {
3e621214 769 pnfs_get_layout_hdr(lo);
2454dfea 770 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
3e621214
TM		 771 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
772 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
773 spin_unlock(&nfsi->vfs_inode.i_lock);
774 pnfs_free_lseg_list(&tmp_list);
1f18b82c 775 nfs_commit_inode(&nfsi->vfs_inode, 0);
3e621214
TM		 776 pnfs_put_layout_hdr(lo);
777 } else
778 spin_unlock(&nfsi->vfs_inode.i_lock);
b6d49ecd
TM		 779 return lo;
780}
781
782void pnfs_destroy_layout(struct nfs_inode *nfsi)
783{
784 __pnfs_destroy_layout(nfsi);
974cec8c 785}
041245c8 786EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
974cec8c 787
b6d49ecd
TM		 788static bool pnfs_layout_removed(struct nfs_inode *nfsi,
789 struct pnfs_layout_hdr *lo)
790{
791 bool ret;
792
793 spin_lock(&nfsi->vfs_inode.i_lock);
794 ret = nfsi->layout != lo;
795 spin_unlock(&nfsi->vfs_inode.i_lock);
796 return ret;
797}
798
799void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
800{
801 struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi);
802
803 if (lo)
804 wait_var_event(lo, pnfs_layout_removed(nfsi, lo));
805}
806
fd9a8d71
TM		 807static bool
808pnfs_layout_add_bulk_destroy_list(struct inode *inode,
809 struct list_head *layout_list)
974cec8c
AA		 810{
811 struct pnfs_layout_hdr *lo;
fd9a8d71 812 bool ret = false;
974cec8c 813
fd9a8d71
TM		 814 spin_lock(&inode->i_lock);
815 lo = NFS_I(inode)->layout;
816 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
817 pnfs_get_layout_hdr(lo);
818 list_add(&lo->plh_bulk_destroy, layout_list);
819 ret = true;
820 }
821 spin_unlock(&inode->i_lock);
822 return ret;
823}
824
825/* Caller must hold rcu_read_lock and clp->cl_lock */
826static int
827pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
828 struct nfs_server *server,
829 struct list_head *layout_list)
5085607d
TM		 830 __must_hold(&clp->cl_lock)
831 __must_hold(RCU)
fd9a8d71
TM		 832{
833 struct pnfs_layout_hdr *lo, *next;
834 struct inode *inode;
835
836 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
5085607d
TM		 837 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
838 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
839 !list_empty(&lo->plh_bulk_destroy))
b85f5620 840 continue;
5085607d
TM		 841 /* If the sb is being destroyed, just bail */
842 if (!nfs_sb_active(server->super))
843 break;
b5fdf841 844 inode = pnfs_grab_inode_layout_hdr(lo);
5085607d 845 if (inode != NULL) {
cf6605d1
TM		 846 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags))
847 list_del_rcu(&lo->plh_layouts);
5085607d
TM		 848 if (pnfs_layout_add_bulk_destroy_list(inode,
849 layout_list))
850 continue;
851 rcu_read_unlock();
852 spin_unlock(&clp->cl_lock);
853 iput(inode);
854 } else {
855 rcu_read_unlock();
856 spin_unlock(&clp->cl_lock);
5085607d
TM		 857 }
858 nfs_sb_deactive(server->super);
fd9a8d71
TM		 859 spin_lock(&clp->cl_lock);
860 rcu_read_lock();
861 return -EAGAIN;
862 }
863 return 0;
864}
865
866static int
867pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
868 bool is_bulk_recall)
869{
870 struct pnfs_layout_hdr *lo;
871 struct inode *inode;
fd9a8d71
TM		 872 LIST_HEAD(lseg_list);
873 int ret = 0;
874
875 while (!list_empty(layout_list)) {
876 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
877 plh_bulk_destroy);
878 dprintk("%s freeing layout for inode %lu\n", __func__,
879 lo->plh_inode->i_ino);
880 inode = lo->plh_inode;
7c5d1875
CH		 881
882 pnfs_layoutcommit_inode(inode, false);
883
fd9a8d71
TM		 884 spin_lock(&inode->i_lock);
885 list_del_init(&lo->plh_bulk_destroy);
9fd4b9fc
TM		 886 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
887 if (is_bulk_recall)
888 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
fd9a8d71 889 ret = -EAGAIN;
9fd4b9fc 890 }
fd9a8d71
TM		 891 spin_unlock(&inode->i_lock);
892 pnfs_free_lseg_list(&lseg_list);
b20135d0
TM		 893 /* Free all lsegs that are attached to commit buckets */
894 nfs_commit_inode(inode, 0);
fd9a8d71 895 pnfs_put_layout_hdr(lo);
5085607d 896 nfs_iput_and_deactive(inode);
fd9a8d71
TM		 897 }
898 return ret;
899}
900
901int
902pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
903 struct nfs_fsid *fsid,
904 bool is_recall)
905{
906 struct nfs_server *server;
907 LIST_HEAD(layout_list);
c47abcf8 908
974cec8c 909 spin_lock(&clp->cl_lock);
6382a441 910 rcu_read_lock();
fd9a8d71 911restart:
6382a441 912 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
fd9a8d71
TM		 913 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
914 continue;
915 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
916 server,
917 &layout_list) != 0)
918 goto restart;
6382a441
WAA		 919 }
920 rcu_read_unlock();
974cec8c
AA		 921 spin_unlock(&clp->cl_lock);
922
fd9a8d71
TM		 923 if (list_empty(&layout_list))
924 return 0;
925 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
926}
927
928int
929pnfs_destroy_layouts_byclid(struct nfs_client *clp,
930 bool is_recall)
931{
932 struct nfs_server *server;
933 LIST_HEAD(layout_list);
934
935 spin_lock(&clp->cl_lock);
936 rcu_read_lock();
937restart:
938 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
939 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
940 server,
941 &layout_list) != 0)
942 goto restart;
974cec8c 943 }
fd9a8d71
TM		 944 rcu_read_unlock();
945 spin_unlock(&clp->cl_lock);
946
947 if (list_empty(&layout_list))
948 return 0;
949 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
950}
951
952/*
9f266451 953 * Called by the state manager to remove all layouts established under an
fd9a8d71
TM		 954 * expired lease.
955 */
956void
957pnfs_destroy_all_layouts(struct nfs_client *clp)
958{
959 nfs4_deviceid_mark_client_invalid(clp);
960 nfs4_deviceid_purge_client(clp);
961
962 pnfs_destroy_layouts_byclid(clp, false);
e5e94017
BH		 963}
964
59b56394
TM		 965static void
966pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred)
967{
968 const struct cred *old;
969
970 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) {
971 old = xchg(&lo->plh_lc_cred, get_cred(cred));
972 put_cred(old);
973 }
974}
975
fd6002e9 976/* update lo->plh_stateid with new if is more recent */
43f1b3da
FI		 977void
978pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
59b56394 979 const struct cred *cred, bool update_barrier)
b1f69b75 980{
aa95edf3
TM		 981 u32 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
982 u32 newseq = be32_to_cpu(new->seqid);
2a59a041
TM		 983
984 if (!pnfs_layout_is_valid(lo)) {
59b56394 985 pnfs_set_layout_cred(lo, cred);
2a59a041
TM		 986 nfs4_stateid_copy(&lo->plh_stateid, new);
987 lo->plh_barrier = newseq;
988 pnfs_clear_layoutreturn_info(lo);
989 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
990 return;
991 }
aa95edf3
TM		 992
993 if (pnfs_seqid_is_newer(newseq, oldseq))
f597c537 994 nfs4_stateid_copy(&lo->plh_stateid, new);
aa95edf3
TM		 995
996 if (update_barrier) {
997 pnfs_barrier_update(lo, newseq);
ecebb80b 998 return;
aa95edf3
TM		 999 }
1000 /*
1001 * Because of wraparound, we want to keep the barrier
1002 * "close" to the current seqids. We really only want to
1003 * get here from a layoutget call.
1004 */
1005 if (atomic_read(&lo->plh_outstanding) == 1)
1006 pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid));
b1f69b75
AA		 1007}
1008
cf7d63f1 1009static bool
19c54aba
TM		 1010pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
1011 const nfs4_stateid *stateid)
43f1b3da 1012{
19c54aba 1013 u32 seqid = be32_to_cpu(stateid->seqid);
25a1a621 1014
d6236a98 1015 return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid);
19c54aba
TM		 1016}
1017
1018/* lget is set to 1 if called from inside send_layoutget call chain */
1019static bool
e1c06f80 1020pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
19c54aba 1021{
f7e8917a 1022 return lo->plh_block_lgets ||
e1c06f80 1023 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
cf7d63f1
FI		 1024}
1025
5e36e2a9
FI		 1026static struct nfs_server *
1027pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
1028{
1029 struct nfs_server *server;
1030
78746a38 1031 if (inode) {
5e36e2a9 1032 server = NFS_SERVER(inode);
78746a38 1033 } else {
5e36e2a9
FI		 1034 struct dentry *parent_dir = dget_parent(ctx->dentry);
1035 server = NFS_SERVER(parent_dir->d_inode);
1036 dput(parent_dir);
1037 }
1038 return server;
1039}
1040
29a8bfe5
TM		 1041static void nfs4_free_pages(struct page **pages, size_t size)
1042{
1043 int i;
1044
1045 if (!pages)
1046 return;
1047
1048 for (i = 0; i < size; i++) {
1049 if (!pages[i])
1050 break;
1051 __free_page(pages[i]);
1052 }
1053 kfree(pages);
1054}
1055
1056static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
1057{
1058 struct page **pages;
1059 int i;
1060
a2791d3a 1061 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
29a8bfe5
TM		 1062 if (!pages) {
1063 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
1064 return NULL;
1065 }
1066
1067 for (i = 0; i < size; i++) {
1068 pages[i] = alloc_page(gfp_flags);
1069 if (!pages[i]) {
1070 dprintk("%s: failed to allocate page\n", __func__);
a2791d3a 1071 nfs4_free_pages(pages, i);
29a8bfe5
TM		 1072 return NULL;
1073 }
1074 }
1075
1076 return pages;
1077}
1078
587f03de 1079static struct nfs4_layoutget *
5e36e2a9 1080pnfs_alloc_init_layoutget_args(struct inode *ino,
e5e94017 1081 struct nfs_open_context *ctx,
2409a976 1082 const nfs4_stateid *stateid,
e144e539 1083 const struct pnfs_layout_range *range,
587f03de 1084 gfp_t gfp_flags)
e5e94017 1085{
5e36e2a9 1086 struct nfs_server *server = pnfs_find_server(ino, ctx);
28ced9a8 1087 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
dacb452d 1088 size_t max_pages = max_response_pages(server);
b1f69b75 1089 struct nfs4_layoutget *lgp;
b1f69b75
AA		 1090
1091 dprintk("--> %s\n", __func__);
e5e94017 1092
83026d80
JL		 1093 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1094 if (lgp == NULL)
587f03de 1095 return NULL;
83026d80 1096
28ced9a8
TM		 1097 if (max_reply_sz) {
1098 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1099 if (npages < max_pages)
1100 max_pages = npages;
1101 }
1102
dacb452d
FI		 1103 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1104 if (!lgp->args.layout.pages) {
1105 kfree(lgp);
1106 return NULL;
1107 }
1108 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1109 lgp->res.layoutp = &lgp->args.layout;
1110
d49e0d5b
TM		 1111 /* Don't confuse uninitialised result and success */
1112 lgp->res.status = -NFS4ERR_DELAY;
83026d80
JL		 1113
1114 lgp->args.minlength = PAGE_SIZE;
1115 if (lgp->args.minlength > range->length)
1116 lgp->args.minlength = range->length;
5e36e2a9
FI		 1117 if (ino) {
1118 loff_t i_size = i_size_read(ino);
1119
1120 if (range->iomode == IOMODE_READ) {
1121 if (range->offset >= i_size)
1122 lgp->args.minlength = 0;
1123 else if (i_size - range->offset < lgp->args.minlength)
1124 lgp->args.minlength = i_size - range->offset;
1125 }
d03ab29d 1126 }
83026d80
JL		 1127 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1128 pnfs_copy_range(&lgp->args.range, range);
1129 lgp->args.type = server->pnfs_curr_ld->id;
1130 lgp->args.inode = ino;
1131 lgp->args.ctx = get_nfs_open_context(ctx);
183d9e7b 1132 nfs4_stateid_copy(&lgp->args.stateid, stateid);
83026d80 1133 lgp->gfp_flags = gfp_flags;
63ec2b69 1134 lgp->cred = ctx->cred;
587f03de 1135 return lgp;
974cec8c
AA		 1136}
1137
29a8bfe5
TM		 1138void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1139{
1140 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1141
1142 nfs4_free_pages(lgp->args.layout.pages, max_pages);
b4e89bcb 1143 pnfs_put_layout_hdr(lgp->lo);
29a8bfe5
TM		 1144 put_nfs_open_context(lgp->args.ctx);
1145 kfree(lgp);
1146}
1147
24956804
TM		 1148static void pnfs_clear_layoutcommit(struct inode *inode,
1149 struct list_head *head)
1150{
1151 struct nfs_inode *nfsi = NFS_I(inode);
1152 struct pnfs_layout_segment *lseg, *tmp;
1153
1154 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1155 return;
1156 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1157 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1158 continue;
1159 pnfs_lseg_dec_and_remove_zero(lseg, head);
1160 }
1161}
1162
68f74479 1163void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
2a974425 1164 const nfs4_stateid *arg_stateid,
68f74479 1165 const struct pnfs_layout_range *range,
68f74479
TM		 1166 const nfs4_stateid *stateid)
1167{
1168 struct inode *inode = lo->plh_inode;
1169 LIST_HEAD(freeme);
1170
1171 spin_lock(&inode->i_lock);
c18d1e17 1172 if (!pnfs_layout_is_valid(lo) ||
2a974425
TM		 1173 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1174 goto out_unlock;
68f74479 1175 if (stateid) {
2a974425
TM		 1176 u32 seq = be32_to_cpu(arg_stateid->seqid);
1177
68f74479
TM		 1178 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1179 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
59b56394 1180 pnfs_set_layout_stateid(lo, stateid, NULL, true);
68f74479
TM		 1181 } else
1182 pnfs_mark_layout_stateid_invalid(lo, &freeme);
2a974425 1183out_unlock:
68f74479
TM		 1184 pnfs_clear_layoutreturn_waitbit(lo);
1185 spin_unlock(&inode->i_lock);
1186 pnfs_free_lseg_list(&freeme);
1187
1188}
1189
13c13a6a 1190static bool
e5fd1904
TM		 1191pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1192 nfs4_stateid *stateid,
44ea8dfc 1193 const struct cred **cred,
e5fd1904 1194 enum pnfs_iomode *iomode)
13c13a6a 1195{
bf0291dd
TM		 1196 /* Serialise LAYOUTGET/LAYOUTRETURN */
1197 if (atomic_read(&lo->plh_outstanding) != 0)
1198 return false;
6604b203 1199 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
13c13a6a 1200 return false;
6604b203 1201 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
13c13a6a 1202 pnfs_get_layout_hdr(lo);
1bcf34fd
TM		 1203 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1204 *cred = get_cred(lo->plh_lc_cred);
e5fd1904 1205 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
44ea8dfc
TM		 1206 if (lo->plh_return_seq != 0)
1207 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
e5fd1904
TM		 1208 if (iomode != NULL)
1209 *iomode = lo->plh_return_iomode;
1210 pnfs_clear_layoutreturn_info(lo);
1bcf34fd 1211 } else if (iomode != NULL)
e5fd1904 1212 *iomode = IOMODE_ANY;
1bcf34fd 1213 pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid));
13c13a6a
TM		 1214 return true;
1215}
1216
828ed9ec
TM		 1217static void
1218pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1219 struct pnfs_layout_hdr *lo,
1220 const nfs4_stateid *stateid,
1221 enum pnfs_iomode iomode)
1222{
1223 struct inode *inode = lo->plh_inode;
1224
1225 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1226 args->inode = inode;
1227 args->range.iomode = iomode;
1228 args->range.offset = 0;
1229 args->range.length = NFS4_MAX_UINT64;
1230 args->layout = lo;
1231 nfs4_stateid_copy(&args->stateid, stateid);
1232}
1233
f40eb5d0 1234static int
44ea8dfc
TM		 1235pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo,
1236 const nfs4_stateid *stateid,
1237 const struct cred **pcred,
1238 enum pnfs_iomode iomode,
1239 bool sync)
f40eb5d0
PT		 1240{
1241 struct inode *ino = lo->plh_inode;
287bd3e9 1242 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
f40eb5d0 1243 struct nfs4_layoutreturn *lrp;
44ea8dfc 1244 const struct cred *cred = *pcred;
f40eb5d0
PT		 1245 int status = 0;
1246
44ea8dfc 1247 *pcred = NULL;
63d8a41b 1248 lrp = kzalloc(sizeof(*lrp), nfs_io_gfp_mask());
f40eb5d0
PT		 1249 if (unlikely(lrp == NULL)) {
1250 status = -ENOMEM;
1251 spin_lock(&ino->i_lock);
d67ae825 1252 pnfs_clear_layoutreturn_waitbit(lo);
f40eb5d0 1253 spin_unlock(&ino->i_lock);
44ea8dfc 1254 put_cred(cred);
f40eb5d0
PT		 1255 pnfs_put_layout_hdr(lo);
1256 goto out;
1257 }
1258
828ed9ec 1259 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
4d796d75 1260 lrp->args.ld_private = &lrp->ld_private;
f40eb5d0 1261 lrp->clp = NFS_SERVER(ino)->nfs_client;
44ea8dfc 1262 lrp->cred = cred;
287bd3e9
TM		 1263 if (ld->prepare_layoutreturn)
1264 ld->prepare_layoutreturn(&lrp->args);
f40eb5d0 1265
6c16605d 1266 status = nfs4_proc_layoutreturn(lrp, sync);
f40eb5d0
PT		 1267out:
1268 dprintk("<-- %s status: %d\n", __func__, status);
1269 return status;
1270}
1271
d474f961
TM		 1272static bool
1273pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo,
1274 enum pnfs_iomode iomode,
1275 u32 seq)
1276{
1277 struct pnfs_layout_range recall_range = {
1278 .length = NFS4_MAX_UINT64,
1279 .iomode = iomode,
1280 };
1281 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
1282 &recall_range, seq) != -EBUSY;
1283}
1284
13c13a6a
TM		 1285/* Return true if layoutreturn is needed */
1286static bool
1287pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1288{
2370abda 1289 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
13c13a6a 1290 return false;
d474f961
TM		 1291 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode,
1292 lo->plh_return_seq);
13c13a6a
TM		 1293}
1294
1295static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1296{
1297 struct inode *inode= lo->plh_inode;
1298
2370abda 1299 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
13c13a6a
TM		 1300 return;
1301 spin_lock(&inode->i_lock);
1302 if (pnfs_layout_need_return(lo)) {
44ea8dfc 1303 const struct cred *cred;
13c13a6a
TM		 1304 nfs4_stateid stateid;
1305 enum pnfs_iomode iomode;
1306 bool send;
1307
44ea8dfc 1308 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
13c13a6a
TM		 1309 spin_unlock(&inode->i_lock);
1310 if (send) {
1311 /* Send an async layoutreturn so we dont deadlock */
44ea8dfc 1312 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
13c13a6a
TM		 1313 }
1314 } else
1315 spin_unlock(&inode->i_lock);
1316}
1317
293b3b06
AA		 1318/*
1319 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1320 * when the layout segment list is empty.
1321 *
1322 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1323 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1324 * deviceid is marked invalid.
1325 */
cbe82603
BH		 1326int
1327_pnfs_return_layout(struct inode *ino)
1328{
1329 struct pnfs_layout_hdr *lo = NULL;
1330 struct nfs_inode *nfsi = NFS_I(ino);
a421d218
AS		 1331 struct pnfs_layout_range range = {
1332 .iomode = IOMODE_ANY,
1333 .offset = 0,
1334 .length = NFS4_MAX_UINT64,
1335 };
cbe82603 1336 LIST_HEAD(tmp_list);
44ea8dfc 1337 const struct cred *cred;
cbe82603 1338 nfs4_stateid stateid;
24408f52 1339 int status = 0;
93b7f7ad 1340 bool send, valid_layout;
cbe82603 1341
366d5052 1342 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
cbe82603
BH		 1343
1344 spin_lock(&ino->i_lock);
1345 lo = nfsi->layout;
e5929f3c 1346 if (!lo) {
cbe82603 1347 spin_unlock(&ino->i_lock);
293b3b06
AA		 1348 dprintk("NFS: %s no layout to return\n", __func__);
1349 goto out;
cbe82603 1350 }
cbe82603 1351 /* Reference matched in nfs4_layoutreturn_release */
70c3bd2b 1352 pnfs_get_layout_hdr(lo);
24408f52
TM		 1353 /* Is there an outstanding layoutreturn ? */
1354 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1355 spin_unlock(&ino->i_lock);
1356 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1357 TASK_UNINTERRUPTIBLE))
1358 goto out_put_layout_hdr;
1359 spin_lock(&ino->i_lock);
1360 }
93b7f7ad 1361 valid_layout = pnfs_layout_is_valid(lo);
24956804 1362 pnfs_clear_layoutcommit(ino, &tmp_list);
a421d218
AS		 1363 pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0);
1364
1365 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range)
c88953d8 1366 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
c88953d8 1367
293b3b06 1368 /* Don't send a LAYOUTRETURN if list was initially empty */
93b7f7ad
OK		 1369 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1370 !valid_layout) {
293b3b06 1371 spin_unlock(&ino->i_lock);
293b3b06 1372 dprintk("NFS: %s no layout segments to return\n", __func__);
7bcc1058 1373 goto out_wait_layoutreturn;
293b3b06 1374 }
47abadef 1375
44ea8dfc 1376 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
cbe82603 1377 spin_unlock(&ino->i_lock);
7f27392c 1378 if (send)
44ea8dfc 1379 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
7bcc1058
TM		 1380out_wait_layoutreturn:
1381 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
7f27392c 1382out_put_layout_hdr:
ee6625a9 1383 pnfs_free_lseg_list(&tmp_list);
7f27392c 1384 pnfs_put_layout_hdr(lo);
cbe82603
BH		 1385out:
1386 dprintk("<-- %s status: %d\n", __func__, status);
1387 return status;
1388}
1389
24028672
TM		 1390int
1391pnfs_commit_and_return_layout(struct inode *inode)
1392{
1393 struct pnfs_layout_hdr *lo;
1394 int ret;
1395
1396 spin_lock(&inode->i_lock);
1397 lo = NFS_I(inode)->layout;
1398 if (lo == NULL) {
1399 spin_unlock(&inode->i_lock);
1400 return 0;
1401 }
1402 pnfs_get_layout_hdr(lo);
1403 /* Block new layoutgets and read/write to ds */
1404 lo->plh_block_lgets++;
1405 spin_unlock(&inode->i_lock);
1406 filemap_fdatawait(inode->i_mapping);
1407 ret = pnfs_layoutcommit_inode(inode, true);
1408 if (ret == 0)
1409 ret = _pnfs_return_layout(inode);
1410 spin_lock(&inode->i_lock);
1411 lo->plh_block_lgets--;
1412 spin_unlock(&inode->i_lock);
1413 pnfs_put_layout_hdr(lo);
1414 return ret;
1415}
1416
1c5bd76d
TM		 1417bool pnfs_roc(struct inode *ino,
1418 struct nfs4_layoutreturn_args *args,
1419 struct nfs4_layoutreturn_res *res,
a52458b4 1420 const struct cred *cred)
f7e8917a 1421{
40dd4b7a
TM		 1422 struct nfs_inode *nfsi = NFS_I(ino);
1423 struct nfs_open_context *ctx;
1424 struct nfs4_state *state;
f7e8917a 1425 struct pnfs_layout_hdr *lo;
1c5bd76d 1426 struct pnfs_layout_segment *lseg, *next;
44ea8dfc 1427 const struct cred *lc_cred;
193e3aa2 1428 nfs4_stateid stateid;
1c5bd76d
TM		 1429 enum pnfs_iomode iomode = 0;
1430 bool layoutreturn = false, roc = false;
e71708d4 1431 bool skip_read = false;
f7e8917a 1432
1c5bd76d
TM		 1433 if (!nfs_have_layout(ino))
1434 return false;
29ade5db 1435retry:
0de43976 1436 rcu_read_lock();
f7e8917a 1437 spin_lock(&ino->i_lock);
40dd4b7a 1438 lo = nfsi->layout;
0cdc329e 1439 if (!lo || !pnfs_layout_is_valid(lo) ||
9c6376eb
TM		 1440 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1441 lo = NULL;
40dd4b7a 1442 goto out_noroc;
9c6376eb
TM		 1443 }
1444 pnfs_get_layout_hdr(lo);
29ade5db 1445 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
29ade5db 1446 spin_unlock(&ino->i_lock);
0de43976 1447 rcu_read_unlock();
29ade5db
TM		 1448 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1449 TASK_UNINTERRUPTIBLE);
1450 pnfs_put_layout_hdr(lo);
1451 goto retry;
1452 }
40dd4b7a 1453
e755d638 1454 /* no roc if we hold a delegation */
e71708d4
TM		 1455 if (nfs4_check_delegation(ino, FMODE_READ)) {
1456 if (nfs4_check_delegation(ino, FMODE_WRITE))
1457 goto out_noroc;
1458 skip_read = true;
1459 }
40dd4b7a 1460
0de43976 1461 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
40dd4b7a 1462 state = ctx->state;
e71708d4
TM		 1463 if (state == NULL)
1464 continue;
40dd4b7a 1465 /* Don't return layout if there is open file state */
e71708d4 1466 if (state->state & FMODE_WRITE)
40dd4b7a 1467 goto out_noroc;
e71708d4
TM		 1468 if (state->state & FMODE_READ)
1469 skip_read = true;
40dd4b7a
TM		 1470 }
1471
e755d638 1472
1c5bd76d 1473 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
e71708d4
TM		 1474 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1475 continue;
e755d638 1476 /* If we are sending layoutreturn, invalidate all valid lsegs */
1c5bd76d
TM		 1477 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1478 continue;
1479 /*
1480 * Note: mark lseg for return so pnfs_layout_remove_lseg
1481 * doesn't invalidate the layout for us.
1482 */
1483 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1484 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1485 continue;
1486 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
69820d22
TM		 1487 }
1488
1c5bd76d
TM		 1489 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1490 goto out_noroc;
69820d22 1491
500d701f 1492 /* ROC in two conditions:
e755d638
PT		 1493 * 1. there are ROC lsegs
1494 * 2. we don't send layoutreturn
e755d638 1495 */
1c5bd76d 1496 /* lo ref dropped in pnfs_roc_release() */
44ea8dfc 1497 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode);
1c5bd76d 1498 /* If the creds don't match, we can't compound the layoutreturn */
4d8948c7 1499 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
1c5bd76d
TM		 1500 goto out_noroc;
1501
1502 roc = layoutreturn;
1503 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1504 res->lrs_present = 0;
1505 layoutreturn = false;
44ea8dfc 1506 put_cred(lc_cred);
4d8948c7 1507
40dd4b7a 1508out_noroc:
f7e8917a 1509 spin_unlock(&ino->i_lock);
0de43976 1510 rcu_read_unlock();
e755d638 1511 pnfs_layoutcommit_inode(ino, true);
287bd3e9
TM		 1512 if (roc) {
1513 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1514 if (ld->prepare_layoutreturn)
1515 ld->prepare_layoutreturn(args);
9c6376eb 1516 pnfs_put_layout_hdr(lo);
287bd3e9
TM		 1517 return true;
1518 }
e755d638 1519 if (layoutreturn)
44ea8dfc 1520 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true);
9c6376eb 1521 pnfs_put_layout_hdr(lo);
287bd3e9 1522 return false;
f7e8917a
FI		 1523}
1524
078000d0
TM		 1525int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
1526 struct nfs4_layoutreturn_res **respp, int *ret)
287a9c55
TM		 1527{
1528 struct nfs4_layoutreturn_args *arg = *argpp;
1529 int retval = -EAGAIN;
1530
1531 if (!arg)
1532 return 0;
1533 /* Handle Layoutreturn errors */
1534 switch (*ret) {
1535 case 0:
1536 retval = 0;
1537 break;
6109bcf7
TM		 1538 case -NFS4ERR_NOMATCHING_LAYOUT:
1539 /* Was there an RPC level error? If not, retry */
1540 if (task->tk_rpc_status == 0)
1541 break;
1542 /* If the call was not sent, let caller handle it */
1543 if (!RPC_WAS_SENT(task))
1544 return 0;
1545 /*
1546 * Otherwise, assume the call succeeded and
1547 * that we need to release the layout
1548 */
1549 *ret = 0;
1550 (*respp)->lrs_present = 0;
1551 retval = 0;
1552 break;
078a432d
TM		 1553 case -NFS4ERR_DELAY:
1554 /* Let the caller handle the retry */
1555 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1556 return 0;
287a9c55 1557 case -NFS4ERR_OLD_STATEID:
30cb3ee2 1558 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
078000d0 1559 &arg->range, arg->inode))
287a9c55
TM		 1560 break;
1561 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1562 return -EAGAIN;
1563 }
1564 *argpp = NULL;
1565 *respp = NULL;
1566 return retval;
1567}
1568
1c5bd76d
TM		 1569void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1570 struct nfs4_layoutreturn_res *res,
1571 int ret)
f7e8917a 1572{
1c5bd76d 1573 struct pnfs_layout_hdr *lo = args->layout;
67bbceed 1574 struct inode *inode = args->inode;
1c5bd76d 1575 const nfs4_stateid *res_stateid = NULL;
287bd3e9 1576 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
f7e8917a 1577
9c47b18c
TM		 1578 switch (ret) {
1579 case -NFS4ERR_NOMATCHING_LAYOUT:
67bbceed
TM		 1580 spin_lock(&inode->i_lock);
1581 if (pnfs_layout_is_valid(lo) &&
1582 nfs4_stateid_match_other(&args->stateid, &lo->plh_stateid))
1583 pnfs_set_plh_return_info(lo, args->range.iomode, 0);
c18d1e17 1584 pnfs_clear_layoutreturn_waitbit(lo);
67bbceed 1585 spin_unlock(&inode->i_lock);
9c47b18c
TM		 1586 break;
1587 case 0:
1c5bd76d
TM		 1588 if (res->lrs_present)
1589 res_stateid = &res->stateid;
df561f66 1590 fallthrough;
9c47b18c 1591 default:
c18d1e17
TM		 1592 pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range,
1593 res_stateid);
1c5bd76d 1594 }
a19b4785 1595 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret);
287bd3e9
TM		 1596 if (ld_private && ld_private->ops && ld_private->ops->free)
1597 ld_private->ops->free(ld_private);
1c5bd76d 1598 pnfs_put_layout_hdr(lo);
f7e8917a
FI		 1599}
1600
500d701f
PT		 1601bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1602{
1603 struct nfs_inode *nfsi = NFS_I(ino);
1604 struct pnfs_layout_hdr *lo;
1605 bool sleep = false;
1606
1607 /* we might not have grabbed lo reference. so need to check under
1608 * i_lock */
1609 spin_lock(&ino->i_lock);
1610 lo = nfsi->layout;
ee284e35
TM		 1611 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1612 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
500d701f 1613 sleep = true;
ee284e35 1614 }
500d701f 1615 spin_unlock(&ino->i_lock);
500d701f
PT		 1616 return sleep;
1617}
1618
b1f69b75
AA		 1619/*
1620 * Compare two layout segments for sorting into layout cache.
1621 * We want to preferentially return RW over RO layouts, so ensure those
1622 * are seen first.
1623 */
1624static s64
7dc0ac70 1625pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
3cb2df17 1626 const struct pnfs_layout_range *l2)
b1f69b75 1627{
fb3296eb
BH		 1628 s64 d;
1629
1630 /* high offset > low offset */
1631 d = l1->offset - l2->offset;
1632 if (d)
1633 return d;
1634
1635 /* short length > long length */
1636 d = l2->length - l1->length;
1637 if (d)
1638 return d;
1639
b1f69b75 1640 /* read > read/write */
fb3296eb 1641 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
b1f69b75
AA		 1642}
1643
03772d2f
TM		 1644static bool
1645pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1646 const struct pnfs_layout_range *l2)
1647{
1648 return pnfs_lseg_range_cmp(l1, l2) > 0;
1649}
1650
1651static bool
1652pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1653 struct pnfs_layout_segment *old)
1654{
1655 return false;
1656}
1657
1658void
1659pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1660 struct pnfs_layout_segment *lseg,
1661 bool (*is_after)(const struct pnfs_layout_range *,
1662 const struct pnfs_layout_range *),
1663 bool (*do_merge)(struct pnfs_layout_segment *,
1664 struct pnfs_layout_segment *),
1665 struct list_head *free_me)
974cec8c 1666{
03772d2f 1667 struct pnfs_layout_segment *lp, *tmp;
b1f69b75 1668
974cec8c
AA		 1669 dprintk("%s:Begin\n", __func__);
1670
03772d2f
TM		 1671 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1672 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1673 continue;
1674 if (do_merge(lseg, lp)) {
1675 mark_lseg_invalid(lp, free_me);
1676 continue;
1677 }
1678 if (is_after(&lseg->pls_range, &lp->pls_range))
b1f69b75 1679 continue;
566052c5 1680 list_add_tail(&lseg->pls_list, &lp->pls_list);
b1f69b75
AA		 1681 dprintk("%s: inserted lseg %p "
1682 "iomode %d offset %llu length %llu before "
1683 "lp %p iomode %d offset %llu length %llu\n",
566052c5
FI		 1684 __func__, lseg, lseg->pls_range.iomode,
1685 lseg->pls_range.offset, lseg->pls_range.length,
1686 lp, lp->pls_range.iomode, lp->pls_range.offset,
1687 lp->pls_range.length);
fb3296eb 1688 goto out;
974cec8c 1689 }
fb3296eb
BH		 1690 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1691 dprintk("%s: inserted lseg %p "
1692 "iomode %d offset %llu length %llu at tail\n",
1693 __func__, lseg, lseg->pls_range.iomode,
1694 lseg->pls_range.offset, lseg->pls_range.length);
1695out:
70c3bd2b 1696 pnfs_get_layout_hdr(lo);
974cec8c
AA		 1697
1698 dprintk("%s:Return\n", __func__);
e5e94017 1699}
03772d2f
TM		 1700EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1701
1702static void
1703pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1704 struct pnfs_layout_segment *lseg,
1705 struct list_head *free_me)
1706{
1707 struct inode *inode = lo->plh_inode;
1708 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1709
1710 if (ld->add_lseg != NULL)
1711 ld->add_lseg(lo, lseg, free_me);
1712 else
1713 pnfs_generic_layout_insert_lseg(lo, lseg,
1714 pnfs_lseg_range_is_after,
1715 pnfs_lseg_no_merge,
1716 free_me);
1717}
e5e94017
BH		 1718
1719static struct pnfs_layout_hdr *
9fa40758
PT		 1720alloc_init_layout_hdr(struct inode *ino,
1721 struct nfs_open_context *ctx,
1722 gfp_t gfp_flags)
e5e94017
BH		 1723{
1724 struct pnfs_layout_hdr *lo;
1725
636fb9c8 1726 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
e5e94017
BH		 1727 if (!lo)
1728 return NULL;
2b28a7be 1729 refcount_set(&lo->plh_refcount, 1);
b7edfaa1
FI		 1730 INIT_LIST_HEAD(&lo->plh_layouts);
1731 INIT_LIST_HEAD(&lo->plh_segs);
68f74479 1732 INIT_LIST_HEAD(&lo->plh_return_segs);
fd9a8d71 1733 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
b7edfaa1 1734 lo->plh_inode = ino;
a52458b4 1735 lo->plh_lc_cred = get_cred(ctx->cred);
67a3b721 1736 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
e5e94017
BH		 1737 return lo;
1738}
1739
1740static struct pnfs_layout_hdr *
9fa40758
PT		 1741pnfs_find_alloc_layout(struct inode *ino,
1742 struct nfs_open_context *ctx,
1743 gfp_t gfp_flags)
e5241e43
TM		 1744 __releases(&ino->i_lock)
1745 __acquires(&ino->i_lock)
e5e94017
BH		 1746{
1747 struct nfs_inode *nfsi = NFS_I(ino);
1748 struct pnfs_layout_hdr *new = NULL;
1749
1750 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1751
251ec410
TM		 1752 if (nfsi->layout != NULL)
1753 goto out_existing;
e5e94017 1754 spin_unlock(&ino->i_lock);
9fa40758 1755 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
e5e94017
BH		 1756 spin_lock(&ino->i_lock);
1757
251ec410 1758 if (likely(nfsi->layout == NULL)) { /* Won the race? */
e5e94017 1759 nfsi->layout = new;
251ec410 1760 return new;
7175fe90
YN		 1761 } else if (new != NULL)
1762 pnfs_free_layout_hdr(new);
251ec410
TM		 1763out_existing:
1764 pnfs_get_layout_hdr(nfsi->layout);
e5e94017
BH		 1765 return nfsi->layout;
1766}
1767
b1f69b75
AA		 1768/*
1769 * iomode matching rules:
c7d73af2
TH		 1770 * iomode lseg strict match
1771 * iomode
1772 * ----- ----- ------ -----
1773 * ANY READ N/A true
1774 * ANY RW N/A true
1775 * RW READ N/A false
1776 * RW RW N/A true
1777 * READ READ N/A true
1778 * READ RW true false
1779 * READ RW false true
b1f69b75 1780 */
3cb2df17 1781static bool
7dc0ac70 1782pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
c7d73af2
TH		 1783 const struct pnfs_layout_range *range,
1784 bool strict_iomode)
b1f69b75 1785{
fb3296eb
BH		 1786 struct pnfs_layout_range range1;
1787
1788 if ((range->iomode == IOMODE_RW &&
1789 ls_range->iomode != IOMODE_RW) ||
c7d73af2 1790 (range->iomode != ls_range->iomode &&
6089dd0d 1791 strict_iomode) ||
7dc0ac70 1792 !pnfs_lseg_range_intersecting(ls_range, range))
10db5b7a 1793 return false;
fb3296eb
BH		 1794
1795 /* range1 covers only the first byte in the range */
1796 range1 = *range;
1797 range1.length = 1;
7dc0ac70 1798 return pnfs_lseg_range_contained(ls_range, &range1);
b1f69b75
AA		 1799}
1800
1801/*
1802 * lookup range in layout
1803 */
e5e94017 1804static struct pnfs_layout_segment *
fb3296eb 1805pnfs_find_lseg(struct pnfs_layout_hdr *lo,
c7d73af2
TH		 1806 struct pnfs_layout_range *range,
1807 bool strict_iomode)
e5e94017 1808{
b1f69b75
AA		 1809 struct pnfs_layout_segment *lseg, *ret = NULL;
1810
1811 dprintk("%s:Begin\n", __func__);
1812
b7edfaa1 1813 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
4541d16c 1814 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
c7d73af2
TH		 1815 pnfs_lseg_range_match(&lseg->pls_range, range,
1816 strict_iomode)) {
9369a431 1817 ret = pnfs_get_lseg(lseg);
b1f69b75
AA		 1818 break;
1819 }
b1f69b75
AA		 1820 }
1821
1822 dprintk("%s:Return lseg %p ref %d\n",
eba6dd69 1823 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
b1f69b75 1824 return ret;
e5e94017
BH		 1825}
1826
d23d61c8
AA		 1827/*
1828 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1829 * to the MDS or over pNFS
1830 *
1831 * The nfs_inode read_io and write_io fields are cumulative counters reset
1832 * when there are no layout segments. Note that in pnfs_update_layout iomode
1833 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1834 * WRITE request.
1835 *
1836 * A return of true means use MDS I/O.
1837 *
1838 * From rfc 5661:
1839 * If a file's size is smaller than the file size threshold, data accesses
1840 * SHOULD be sent to the metadata server. If an I/O request has a length that
1841 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1842 * server. If both file size and I/O size are provided, the client SHOULD
1843 * reach or exceed both thresholds before sending its read or write
1844 * requests to the data server.
1845 */
1846static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1847 struct inode *ino, int iomode)
1848{
1849 struct nfs4_threshold *t = ctx->mdsthreshold;
1850 struct nfs_inode *nfsi = NFS_I(ino);
1851 loff_t fsize = i_size_read(ino);
1852 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1853
1854 if (t == NULL)
1855 return ret;
1856
1857 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1858 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1859
1860 switch (iomode) {
1861 case IOMODE_READ:
1862 if (t->bm & THRESHOLD_RD) {
1863 dprintk("%s fsize %llu\n", __func__, fsize);
1864 size_set = true;
1865 if (fsize < t->rd_sz)
1866 size = true;
1867 }
1868 if (t->bm & THRESHOLD_RD_IO) {
1869 dprintk("%s nfsi->read_io %llu\n", __func__,
1870 nfsi->read_io);
1871 io_set = true;
1872 if (nfsi->read_io < t->rd_io_sz)
1873 io = true;
1874 }
1875 break;
1876 case IOMODE_RW:
1877 if (t->bm & THRESHOLD_WR) {
1878 dprintk("%s fsize %llu\n", __func__, fsize);
1879 size_set = true;
1880 if (fsize < t->wr_sz)
1881 size = true;
1882 }
1883 if (t->bm & THRESHOLD_WR_IO) {
1884 dprintk("%s nfsi->write_io %llu\n", __func__,
1885 nfsi->write_io);
1886 io_set = true;
1887 if (nfsi->write_io < t->wr_io_sz)
1888 io = true;
1889 }
1890 break;
1891 }
1892 if (size_set && io_set) {
1893 if (size && io)
1894 ret = true;
1895 } else if (size || io)
1896 ret = true;
1897
1898 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1899 return ret;
1900}
1901
d03360aa 1902static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
aa8a45ee
PT		 1903{
1904 /*
1905 * send layoutcommit as it can hold up layoutreturn due to lseg
1906 * reference
1907 */
1908 pnfs_layoutcommit_inode(lo->plh_inode, false);
d03360aa 1909 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
2e5b29f0 1910 nfs_wait_bit_killable,
d03360aa 1911 TASK_KILLABLE);
aa8a45ee
PT		 1912}
1913
411ae722
TM		 1914static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1915{
1916 atomic_inc(&lo->plh_outstanding);
1917}
1918
1919static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1920{
880265c7
TM		 1921 if (atomic_dec_and_test(&lo->plh_outstanding) &&
1922 test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags))
1923 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN);
411ae722
TM		 1924}
1925
d29b468d
TM		 1926static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo)
1927{
1928 return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags);
1929}
1930
d67ae825
TH		 1931static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1932{
1933 unsigned long *bitlock = &lo->plh_flags;
1934
1935 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1936 smp_mb__after_atomic();
1937 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1938}
1939
78746a38
FI		 1940static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1941 struct nfs_server *server)
1942{
cf6605d1 1943 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
78746a38
FI		 1944 struct nfs_client *clp = server->nfs_client;
1945
1946 /* The lo must be on the clp list if there is any
1947 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1948 */
1949 spin_lock(&clp->cl_lock);
cf6605d1 1950 list_add_tail_rcu(&lo->plh_layouts, &server->layouts);
78746a38
FI		 1951 spin_unlock(&clp->cl_lock);
1952 }
1953}
1954
e5e94017
BH		 1955/*
1956 * Layout segment is retreived from the server if not cached.
1957 * The appropriate layout segment is referenced and returned to the caller.
1958 */
7c24d948 1959struct pnfs_layout_segment *
e5e94017
BH		 1960pnfs_update_layout(struct inode *ino,
1961 struct nfs_open_context *ctx,
fb3296eb
BH		 1962 loff_t pos,
1963 u64 count,
a75b9df9 1964 enum pnfs_iomode iomode,
c7d73af2 1965 bool strict_iomode,
a75b9df9 1966 gfp_t gfp_flags)
e5e94017 1967{
fb3296eb
BH		 1968 struct pnfs_layout_range arg = {
1969 .iomode = iomode,
1970 .offset = pos,
1971 .length = count,
1972 };
70d2f7b1 1973 unsigned pg_offset;
6382a441
WAA		 1974 struct nfs_server *server = NFS_SERVER(ino);
1975 struct nfs_client *clp = server->nfs_client;
183d9e7b 1976 struct pnfs_layout_hdr *lo = NULL;
e5e94017 1977 struct pnfs_layout_segment *lseg = NULL;
587f03de 1978 struct nfs4_layoutget *lgp;
183d9e7b
JL		 1979 nfs4_stateid stateid;
1980 long timeout = 0;
66b53f32 1981 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
30005121 1982 bool first;
e5e94017 1983
9a4bf31d 1984 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
183d9e7b 1985 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1986 PNFS_UPDATE_LAYOUT_NO_PNFS);
f86bbcf8 1987 goto out;
9a4bf31d 1988 }
d23d61c8 1989
9a4bf31d 1990 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
183d9e7b 1991 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 1992 PNFS_UPDATE_LAYOUT_MDSTHRESH);
f86bbcf8 1993 goto out;
9a4bf31d 1994 }
d23d61c8 1995
9bf87482 1996lookup_again:
d03360aa
TM		 1997 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1998 if (IS_ERR(lseg))
1999 goto out;
9bf87482 2000 first = false;
e5e94017 2001 spin_lock(&ino->i_lock);
9fa40758 2002 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
830ffb56
TM		 2003 if (lo == NULL) {
2004 spin_unlock(&ino->i_lock);
3764a17e 2005 lseg = ERR_PTR(-ENOMEM);
183d9e7b 2006 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 2007 PNFS_UPDATE_LAYOUT_NOMEM);
830ffb56
TM		 2008 goto out;
2009 }
e5e94017 2010
43f1b3da 2011 /* Do we even need to bother with this? */
a59c30ac 2012 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
183d9e7b 2013 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 2014 PNFS_UPDATE_LAYOUT_BULK_RECALL);
43f1b3da 2015 dprintk("%s matches recall, use MDS\n", __func__);
e5e94017
BH		 2016 goto out_unlock;
2017 }
2018
2019 /* if LAYOUTGET already failed once we don't try again */
2e5b29f0 2020 if (pnfs_layout_io_test_failed(lo, iomode)) {
183d9e7b 2021 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 2022 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
e5e94017 2023 goto out_unlock;
9a4bf31d 2024 }
e5e94017 2025
411ae722
TM		 2026 /*
2027 * If the layout segment list is empty, but there are outstanding
2028 * layoutget calls, then they might be subject to a layoutrecall.
2029 */
880265c7 2030 if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) &&
411ae722
TM		 2031 atomic_read(&lo->plh_outstanding) != 0) {
2032 spin_unlock(&ino->i_lock);
880265c7
TM		 2033 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN,
2034 TASK_KILLABLE));
58bbeab4 2035 if (IS_ERR(lseg))
411ae722
TM		 2036 goto out_put_layout_hdr;
2037 pnfs_put_layout_hdr(lo);
2038 goto lookup_again;
2039 }
2040
2c8d5fc3
TM		 2041 /*
2042 * Because we free lsegs when sending LAYOUTRETURN, we need to wait
2043 * for LAYOUTRETURN.
2044 */
2045 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2046 spin_unlock(&ino->i_lock);
2047 dprintk("%s wait for layoutreturn\n", __func__);
2048 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2049 if (!IS_ERR(lseg)) {
2050 pnfs_put_layout_hdr(lo);
2051 dprintk("%s retrying\n", __func__);
2052 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2053 lseg,
2054 PNFS_UPDATE_LAYOUT_RETRY);
2055 goto lookup_again;
2056 }
2057 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2058 PNFS_UPDATE_LAYOUT_RETURN);
2059 goto out_put_layout_hdr;
2060 }
2061
c7d73af2 2062 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
183d9e7b
JL		 2063 if (lseg) {
2064 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2065 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
2066 goto out_unlock;
2067 }
2068
183d9e7b
JL		 2069 /*
2070 * Choose a stateid for the LAYOUTGET. If we don't have a layout
2071 * stateid, or it has been invalidated, then we must use the open
2072 * stateid.
2073 */
67a3b721 2074 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
d9aba2b4 2075 int status;
183d9e7b
JL		 2076
2077 /*
2078 * The first layoutget for the file. Need to serialize per
9bf87482
PT		 2079 * RFC 5661 Errata 3208.
2080 */
2081 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
2082 &lo->plh_flags)) {
2083 spin_unlock(&ino->i_lock);
d03360aa
TM		 2084 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
2085 NFS_LAYOUT_FIRST_LAYOUTGET,
2086 TASK_KILLABLE));
2087 if (IS_ERR(lseg))
2088 goto out_put_layout_hdr;
9bf87482 2089 pnfs_put_layout_hdr(lo);
183d9e7b 2090 dprintk("%s retrying\n", __func__);
9bf87482
PT		 2091 goto lookup_again;
2092 }
183d9e7b 2093
fbf4bcc9 2094 spin_unlock(&ino->i_lock);
183d9e7b 2095 first = true;
d9aba2b4 2096 status = nfs4_select_rw_stateid(ctx->state,
70d2f7b1 2097 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
d9aba2b4
TM		 2098 NULL, &stateid, NULL);
2099 if (status != 0) {
731c74dd 2100 lseg = ERR_PTR(status);
70d2f7b1
TM		 2101 trace_pnfs_update_layout(ino, pos, count,
2102 iomode, lo, lseg,
2103 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
d9aba2b4
TM		 2104 nfs4_schedule_stateid_recovery(server, ctx->state);
2105 pnfs_clear_first_layoutget(lo);
2106 pnfs_put_layout_hdr(lo);
2107 goto lookup_again;
70d2f7b1 2108 }
fbf4bcc9 2109 spin_lock(&ino->i_lock);
9bf87482 2110 } else {
183d9e7b 2111 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
9bf87482 2112 }
568e8c49 2113
9a4bf31d 2114 if (pnfs_layoutgets_blocked(lo)) {
183d9e7b 2115 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
9a4bf31d 2116 PNFS_UPDATE_LAYOUT_BLOCKED);
cf7d63f1 2117 goto out_unlock;
9a4bf31d 2118 }
411ae722 2119 nfs_layoutget_begin(lo);
f49f9baa 2120 spin_unlock(&ino->i_lock);
30005121 2121
78746a38 2122 _add_to_server_list(lo, server);
e5e94017 2123
09cbfeaf 2124 pg_offset = arg.offset & ~PAGE_MASK;
707ed5fd
BH		 2125 if (pg_offset) {
2126 arg.offset -= pg_offset;
2127 arg.length += pg_offset;
2128 }
7c24d948 2129 if (arg.length != NFS4_MAX_UINT64)
09cbfeaf 2130 arg.length = PAGE_ALIGN(arg.length);
707ed5fd 2131
5e36e2a9 2132 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
587f03de 2133 if (!lgp) {
3764a17e 2134 lseg = ERR_PTR(-ENOMEM);
587f03de
FI		 2135 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2136 PNFS_UPDATE_LAYOUT_NOMEM);
411ae722 2137 nfs_layoutget_end(lo);
587f03de
FI		 2138 goto out_put_layout_hdr;
2139 }
2140
b4e89bcb
TM		 2141 lgp->lo = lo;
2142 pnfs_get_layout_hdr(lo);
2143
dacb452d 2144 lseg = nfs4_proc_layoutget(lgp, &timeout);
183d9e7b
JL		 2145 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2146 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
411ae722 2147 nfs_layoutget_end(lo);
83026d80 2148 if (IS_ERR(lseg)) {
183d9e7b 2149 switch(PTR_ERR(lseg)) {
e85d7ee4 2150 case -EBUSY:
183d9e7b
JL		 2151 if (time_after(jiffies, giveup))
2152 lseg = NULL;
66b53f32
TM		 2153 break;
2154 case -ERECALLCONFLICT:
183d9e7b 2155 case -EAGAIN:
56b38a1f 2156 break;
fe44fb23
TM		 2157 case -ENODATA:
2158 /* The server returned NFS4ERR_LAYOUTUNAVAILABLE */
2159 pnfs_layout_set_fail_bit(
2160 lo, pnfs_iomode_to_fail_bit(iomode));
2161 lseg = NULL;
2162 goto out_put_layout_hdr;
183d9e7b
JL		 2163 default:
2164 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2165 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2166 lseg = NULL;
2167 }
56b38a1f
TM		 2168 goto out_put_layout_hdr;
2169 }
2170 if (lseg) {
2171 if (first)
2172 pnfs_clear_first_layoutget(lo);
2173 trace_pnfs_update_layout(ino, pos, count,
2174 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2175 pnfs_put_layout_hdr(lo);
2176 goto lookup_again;
83026d80
JL		 2177 }
2178 } else {
2179 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2180 }
2181
830ffb56 2182out_put_layout_hdr:
d67ae825
TH		 2183 if (first)
2184 pnfs_clear_first_layoutget(lo);
d5b9216f
TM		 2185 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2186 PNFS_UPDATE_LAYOUT_EXIT);
70c3bd2b 2187 pnfs_put_layout_hdr(lo);
e5e94017 2188out:
f86bbcf8
TM		 2189 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2190 "(%s, offset: %llu, length: %llu)\n",
2191 __func__, ino->i_sb->s_id,
2192 (unsigned long long)NFS_FILEID(ino),
d600ad1f 2193 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
f86bbcf8
TM		 2194 iomode==IOMODE_RW ? "read/write" : "read-only",
2195 (unsigned long long)pos,
2196 (unsigned long long)count);
e5e94017
BH		 2197 return lseg;
2198out_unlock:
2199 spin_unlock(&ino->i_lock);
830ffb56 2200 goto out_put_layout_hdr;
e5e94017 2201}
7c24d948 2202EXPORT_SYMBOL_GPL(pnfs_update_layout);
b1f69b75 2203
540d9864
TM		 2204static bool
2205pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2206{
2207 switch (range->iomode) {
2208 case IOMODE_READ:
2209 case IOMODE_RW:
2210 break;
2211 default:
2212 return false;
2213 }
2214 if (range->offset == NFS4_MAX_UINT64)
2215 return false;
2216 if (range->length == 0)
2217 return false;
2218 if (range->length != NFS4_MAX_UINT64 &&
2219 range->length > NFS4_MAX_UINT64 - range->offset)
2220 return false;
2221 return true;
2222}
2223
78746a38
FI		 2224static struct pnfs_layout_hdr *
2225_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2226{
2227 struct pnfs_layout_hdr *lo;
2228
2229 spin_lock(&ino->i_lock);
63d8a41b 2230 lo = pnfs_find_alloc_layout(ino, ctx, nfs_io_gfp_mask());
78746a38
FI		 2231 if (!lo)
2232 goto out_unlock;
2233 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2234 goto out_unlock;
2235 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2236 goto out_unlock;
2237 if (pnfs_layoutgets_blocked(lo))
2238 goto out_unlock;
2239 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2240 goto out_unlock;
411ae722 2241 nfs_layoutget_begin(lo);
78746a38
FI		 2242 spin_unlock(&ino->i_lock);
2243 _add_to_server_list(lo, NFS_SERVER(ino));
2244 return lo;
2245
2246out_unlock:
2247 spin_unlock(&ino->i_lock);
2248 pnfs_put_layout_hdr(lo);
2249 return NULL;
2250}
2251
2409a976
FI		 2252static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2253 struct nfs_open_context *ctx)
2254{
78746a38
FI		 2255 struct inode *ino = data->dentry->d_inode;
2256 struct pnfs_layout_range rng = {
2257 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2258 IOMODE_RW: IOMODE_READ,
2259 .offset = 0,
2260 .length = NFS4_MAX_UINT64,
2261 };
2262 struct nfs4_layoutget *lgp;
2263 struct pnfs_layout_hdr *lo;
2264
64294b08
TM		 2265 /* Heuristic: don't send layoutget if we have cached data */
2266 if (rng.iomode == IOMODE_READ &&
2267 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2268 return;
2269
78746a38
FI		 2270 lo = _pnfs_grab_empty_layout(ino, ctx);
2271 if (!lo)
2272 return;
63d8a41b
TM		 2273 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &current_stateid, &rng,
2274 nfs_io_gfp_mask());
78746a38
FI		 2275 if (!lgp) {
2276 pnfs_clear_first_layoutget(lo);
cb2856c5 2277 nfs_layoutget_end(lo);
78746a38
FI		 2278 pnfs_put_layout_hdr(lo);
2279 return;
2280 }
b4e89bcb 2281 lgp->lo = lo;
78746a38
FI		 2282 data->lgp = lgp;
2283 data->o_arg.lg_args = &lgp->args;
2284 data->o_res.lg_res = &lgp->res;
2409a976
FI		 2285}
2286
2287static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2288 struct nfs_open_context *ctx)
2289{
b4e89bcb 2290 struct inode *ino = data->dentry->d_inode;
2409a976
FI		 2291 struct pnfs_layout_range rng = {
2292 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2293 IOMODE_RW: IOMODE_READ,
2294 .offset = 0,
2295 .length = NFS4_MAX_UINT64,
2296 };
2297 struct nfs4_layoutget *lgp;
2298
63d8a41b
TM		 2299 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &current_stateid, &rng,
2300 nfs_io_gfp_mask());
2409a976
FI		 2301 if (!lgp)
2302 return;
2303 data->lgp = lgp;
2304 data->o_arg.lg_args = &lgp->args;
2305 data->o_res.lg_res = &lgp->res;
2306}
2307
2308void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2309 struct nfs_open_context *ctx)
2310{
2311 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2312
2313 if (!(pnfs_enabled_sb(server) &&
2314 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2315 return;
2316 /* Could check on max_ops, but currently hardcoded high enough */
6e01260c
FI		 2317 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2318 return;
b4e89bcb
TM		 2319 if (data->lgp)
2320 return;
2409a976
FI		 2321 if (data->state)
2322 _lgopen_prepare_attached(data, ctx);
2323 else
2324 _lgopen_prepare_floating(data, ctx);
2325}
2326
2327void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2328 struct nfs_open_context *ctx)
2329{
2330 struct pnfs_layout_hdr *lo;
2331 struct pnfs_layout_segment *lseg;
c49b5209 2332 struct nfs_server *srv = NFS_SERVER(ino);
2409a976
FI		 2333 u32 iomode;
2334
6e01260c 2335 if (!lgp)
2409a976 2336 return;
6e01260c
FI		 2337 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2338 if (lgp->res.status) {
2339 switch (lgp->res.status) {
6e01260c 2340 default:
8dc96566
TM		 2341 break;
2342 /*
2343 * Halt lgopen attempts if the server doesn't recognise
2344 * the "current stateid" value, the layout type, or the
2345 * layoutget operation as being valid.
2346 * Also if it complains about too many ops in the compound
2347 * or of the request/reply being too big.
2348 */
2349 case -NFS4ERR_BAD_STATEID:
2350 case -NFS4ERR_NOTSUPP:
2351 case -NFS4ERR_REP_TOO_BIG:
2352 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2353 case -NFS4ERR_REQ_TOO_BIG:
2354 case -NFS4ERR_TOO_MANY_OPS:
2355 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
c49b5209 2356 srv->caps &= ~NFS_CAP_LGOPEN;
6e01260c
FI		 2357 }
2358 return;
2359 }
b4e89bcb 2360 if (!lgp->lo) {
78746a38
FI		 2361 lo = _pnfs_grab_empty_layout(ino, ctx);
2362 if (!lo)
2363 return;
b4e89bcb 2364 lgp->lo = lo;
2409a976 2365 } else
b4e89bcb 2366 lo = lgp->lo;
2409a976
FI		 2367
2368 lseg = pnfs_layout_process(lgp);
32f1c28f 2369 if (!IS_ERR(lseg)) {
2409a976
FI		 2370 iomode = lgp->args.range.iomode;
2371 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2372 pnfs_put_lseg(lseg);
2373 }
30ae2412
FI		 2374}
2375
2376void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2377{
2378 if (lgp != NULL) {
b4e89bcb
TM		 2379 if (lgp->lo) {
2380 pnfs_clear_first_layoutget(lgp->lo);
2381 nfs_layoutget_end(lgp->lo);
30ae2412
FI		 2382 }
2383 pnfs_layoutget_free(lgp);
2384 }
2409a976
FI		 2385}
2386
a0b0a6e3 2387struct pnfs_layout_segment *
b1f69b75
AA		 2388pnfs_layout_process(struct nfs4_layoutget *lgp)
2389{
b4e89bcb 2390 struct pnfs_layout_hdr *lo = lgp->lo;
b1f69b75
AA		 2391 struct nfs4_layoutget_res *res = &lgp->res;
2392 struct pnfs_layout_segment *lseg;
b7edfaa1 2393 struct inode *ino = lo->plh_inode;
78096cca 2394 LIST_HEAD(free_me);
540d9864
TM		 2395
2396 if (!pnfs_sanity_check_layout_range(&res->range))
1b3c6d07 2397 return ERR_PTR(-EINVAL);
b1f69b75
AA		 2398
2399 /* Inject layout blob into I/O device driver */
a75b9df9 2400 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1b3c6d07 2401 if (IS_ERR_OR_NULL(lseg)) {
b1f69b75 2402 if (!lseg)
1b3c6d07
JL		 2403 lseg = ERR_PTR(-ENOMEM);
2404
2405 dprintk("%s: Could not allocate layout: error %ld\n",
2406 __func__, PTR_ERR(lseg));
2407 return lseg;
b1f69b75
AA		 2408 }
2409
119cef97 2410 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
1013df61 2411
b1f69b75 2412 spin_lock(&ino->i_lock);
e1c06f80 2413 if (pnfs_layoutgets_blocked(lo)) {
43f1b3da 2414 dprintk("%s forget reply due to state\n", __func__);
1b3c6d07 2415 goto out_forget;
43f1b3da 2416 }
038d6493 2417
880265c7
TM		 2418 if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) &&
2419 !pnfs_is_first_layoutget(lo))
0b77f97a
TM		 2420 goto out_forget;
2421
d29b468d 2422 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
362f7474
CH		 2423 /* existing state ID, make sure the sequence number matches. */
2424 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
0b77f97a 2425 if (!pnfs_layout_is_valid(lo))
d29b468d 2426 lo->plh_barrier = 0;
362f7474 2427 dprintk("%s forget reply due to sequence\n", __func__);
1b3c6d07 2428 goto out_forget;
362f7474 2429 }
59b56394 2430 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false);
d29b468d 2431 } else if (pnfs_layout_is_valid(lo)) {
362f7474
CH		 2432 /*
2433 * We got an entirely new state ID. Mark all segments for the
9888d837 2434 * inode invalid, and retry the layoutget
362f7474 2435 */
08bd8dbe
TM		 2436 struct pnfs_layout_range range = {
2437 .iomode = IOMODE_ANY,
2438 .length = NFS4_MAX_UINT64,
2439 };
fb700ef0 2440 pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0);
9888d837 2441 goto out_forget;
d29b468d
TM		 2442 } else {
2443 /* We have a completely new layout */
d29b468d 2444 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
362f7474 2445 }
038d6493 2446
9369a431 2447 pnfs_get_lseg(lseg);
03772d2f 2448 pnfs_layout_insert_lseg(lo, lseg, &free_me);
8e0acf90 2449
b1f69b75 2450
3976143b 2451 if (res->return_on_close)
f7e8917a 2452 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
f7e8917a 2453
b1f69b75 2454 spin_unlock(&ino->i_lock);
78096cca 2455 pnfs_free_lseg_list(&free_me);
a0b0a6e3 2456 return lseg;
43f1b3da 2457
1b3c6d07 2458out_forget:
43f1b3da
FI		 2459 spin_unlock(&ino->i_lock);
2460 lseg->pls_layout = lo;
2461 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1b3c6d07 2462 return ERR_PTR(-EAGAIN);
b1f69b75
AA		 2463}
2464
2f215968
TM		 2465/**
2466 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2467 * @lo: pointer to layout header
2468 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2469 * @return_range: describe layout segment ranges to be returned
e0b7d420 2470 * @seq: stateid seqid to match
2f215968
TM		 2471 *
2472 * This function is mainly intended for use by layoutrecall. It attempts
2473 * to free the layout segment immediately, or else to mark it for return
2474 * as soon as its reference count drops to zero.
e0b7d420
TM		 2475 *
2476 * Returns
2477 * - 0: a layoutreturn needs to be scheduled.
2478 * - EBUSY: there are layout segment that are still in use.
2479 * - ENOENT: there are no layout segments that need to be returned.
2f215968 2480 */
10335556 2481int
016256df
PT		 2482pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2483 struct list_head *tmp_list,
6d597e17
JL		 2484 const struct pnfs_layout_range *return_range,
2485 u32 seq)
016256df
PT		 2486{
2487 struct pnfs_layout_segment *lseg, *next;
10335556 2488 int remaining = 0;
016256df
PT		 2489
2490 dprintk("%s:Begin lo %p\n", __func__, lo);
2491
fc7ff367 2492 assert_spin_locked(&lo->plh_inode->i_lock);
016256df 2493
39fd0186
TM		 2494 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2495 tmp_list = &lo->plh_return_segs;
2496
016256df 2497 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
e036f464 2498 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
016256df
PT		 2499 dprintk("%s: marking lseg %p iomode %d "
2500 "offset %llu length %llu\n", __func__,
2501 lseg, lseg->pls_range.iomode,
2502 lseg->pls_range.offset,
2503 lseg->pls_range.length);
39fd0186
TM		 2504 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2505 tmp_list = &lo->plh_return_segs;
ff041727 2506 if (mark_lseg_invalid(lseg, tmp_list))
2f215968
TM		 2507 continue;
2508 remaining++;
016256df 2509 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
016256df 2510 }
6d597e17 2511
e0b7d420 2512 if (remaining) {
6d597e17 2513 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
e0b7d420
TM		 2514 return -EBUSY;
2515 }
6d597e17 2516
e0b7d420
TM		 2517 if (!list_empty(&lo->plh_return_segs)) {
2518 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2519 return 0;
2520 }
2521
2522 return -ENOENT;
016256df
PT		 2523}
2524
b5fdf841
TM		 2525static void
2526pnfs_mark_layout_for_return(struct inode *inode,
2527 const struct pnfs_layout_range *range)
016256df 2528{
b5fdf841 2529 struct pnfs_layout_hdr *lo;
10335556 2530 bool return_now = false;
016256df
PT		 2531
2532 spin_lock(&inode->i_lock);
b5fdf841 2533 lo = NFS_I(inode)->layout;
bdebfccd
TM		 2534 if (!pnfs_layout_is_valid(lo)) {
2535 spin_unlock(&inode->i_lock);
2536 return;
2537 }
b5fdf841 2538 pnfs_set_plh_return_info(lo, range->iomode, 0);
016256df
PT		 2539 /*
2540 * mark all matching lsegs so that we are sure to have no live
2541 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2542 * for how it works.
2543 */
b5fdf841 2544 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) {
44ea8dfc 2545 const struct cred *cred;
10335556 2546 nfs4_stateid stateid;
e5fd1904 2547 enum pnfs_iomode iomode;
10335556 2548
44ea8dfc 2549 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
10335556
TM		 2550 spin_unlock(&inode->i_lock);
2551 if (return_now)
44ea8dfc 2552 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
10335556
TM		 2553 } else {
2554 spin_unlock(&inode->i_lock);
2555 nfs_commit_inode(inode, 0);
2556 }
016256df 2557}
b5fdf841
TM		 2558
2559void pnfs_error_mark_layout_for_return(struct inode *inode,
2560 struct pnfs_layout_segment *lseg)
2561{
2562 struct pnfs_layout_range range = {
2563 .iomode = lseg->pls_range.iomode,
2564 .offset = 0,
2565 .length = NFS4_MAX_UINT64,
2566 };
2567
2568 pnfs_mark_layout_for_return(inode, &range);
2569}
016256df
PT		 2570EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2571
b5fdf841
TM		 2572static bool
2573pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo)
2574{
2575 return pnfs_layout_is_valid(lo) &&
2576 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) &&
2577 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
2578}
2579
2580static struct pnfs_layout_segment *
2581pnfs_find_first_lseg(struct pnfs_layout_hdr *lo,
2582 const struct pnfs_layout_range *range,
2583 enum pnfs_iomode iomode)
2584{
2585 struct pnfs_layout_segment *lseg;
2586
2587 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
2588 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
2589 continue;
2590 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2591 continue;
2592 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY)
2593 continue;
2594 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range))
2595 return lseg;
2596 }
2597 return NULL;
2598}
2599
2600/* Find open file states whose mode matches that of the range */
2601static bool
2602pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo,
2603 const struct pnfs_layout_range *range)
2604{
2605 struct list_head *head;
2606 struct nfs_open_context *ctx;
2607 fmode_t mode = 0;
2608
2609 if (!pnfs_layout_can_be_returned(lo) ||
2610 !pnfs_find_first_lseg(lo, range, range->iomode))
2611 return false;
2612
2613 head = &NFS_I(lo->plh_inode)->open_files;
2614 list_for_each_entry_rcu(ctx, head, list) {
2615 if (ctx->state)
2616 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE);
2617 }
2618
2619 switch (range->iomode) {
2620 default:
2621 break;
2622 case IOMODE_READ:
2623 mode &= ~FMODE_WRITE;
2624 break;
2625 case IOMODE_RW:
2626 if (pnfs_find_first_lseg(lo, range, IOMODE_READ))
2627 mode &= ~FMODE_READ;
2628 }
2629 return mode == 0;
2630}
2631
2632static int
2633pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data)
2634{
2635 const struct pnfs_layout_range *range = data;
2636 struct pnfs_layout_hdr *lo;
2637 struct inode *inode;
2638restart:
2639 rcu_read_lock();
2640 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
2641 if (!pnfs_layout_can_be_returned(lo) ||
2642 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2643 continue;
2644 inode = lo->plh_inode;
2645 spin_lock(&inode->i_lock);
2646 if (!pnfs_should_return_unused_layout(lo, range)) {
2647 spin_unlock(&inode->i_lock);
2648 continue;
2649 }
2650 spin_unlock(&inode->i_lock);
2651 inode = pnfs_grab_inode_layout_hdr(lo);
2652 if (!inode)
2653 continue;
2654 rcu_read_unlock();
2655 pnfs_mark_layout_for_return(inode, range);
2656 iput(inode);
2657 cond_resched();
2658 goto restart;
2659 }
2660 rcu_read_unlock();
2661 return 0;
2662}
2663
2664void
2665pnfs_layout_return_unused_byclid(struct nfs_client *clp,
2666 enum pnfs_iomode iomode)
2667{
2668 struct pnfs_layout_range range = {
2669 .iomode = iomode,
2670 .offset = 0,
2671 .length = NFS4_MAX_UINT64,
2672 };
2673
2674 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver,
2675 &range);
2676}
2677
b3230e80
TM		 2678void
2679pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2680{
2681 if (pgio->pg_lseg == NULL ||
2682 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2683 return;
2684 pnfs_put_lseg(pgio->pg_lseg);
2685 pgio->pg_lseg = NULL;
2686}
2687EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2688
08cb5b0f
BC		 2689/*
2690 * Check for any intersection between the request and the pgio->pg_lseg,
2691 * and if none, put this pgio->pg_lseg away.
2692 */
e1e54ab7 2693void
08cb5b0f
BC		 2694pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2695{
2696 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2697 pnfs_put_lseg(pgio->pg_lseg);
2698 pgio->pg_lseg = NULL;
2699 }
2700}
e1e54ab7 2701EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range);
08cb5b0f 2702
d8007d4d
TM		 2703void
2704pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2705{
d1d97395 2706 u64 rd_size;
1fd937bd 2707
b3230e80 2708 pnfs_generic_pg_check_layout(pgio);
08cb5b0f 2709 pnfs_generic_pg_check_range(pgio, req);
cb5d04bc
PT		 2710 if (pgio->pg_lseg == NULL) {
2711 if (pgio->pg_dreq == NULL)
2712 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2713 else
2714 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2715
63d8a41b
TM		 2716 pgio->pg_lseg =
2717 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
2718 req_offset(req), rd_size,
2719 IOMODE_READ, false,
2720 nfs_io_gfp_mask());
d600ad1f
PT		 2721 if (IS_ERR(pgio->pg_lseg)) {
2722 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2723 pgio->pg_lseg = NULL;
2724 return;
2725 }
cb5d04bc 2726 }
e885de1a
TM		 2727 /* If no lseg, fall back to read through mds */
2728 if (pgio->pg_lseg == NULL)
1f945357 2729 nfs_pageio_reset_read_mds(pgio);
e885de1a 2730
d8007d4d
TM		 2731}
2732EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2733
2734void
6296556f
PT		 2735pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2736 struct nfs_page *req, u64 wb_size)
d8007d4d 2737{
b3230e80 2738 pnfs_generic_pg_check_layout(pgio);
08cb5b0f 2739 pnfs_generic_pg_check_range(pgio, req);
d600ad1f 2740 if (pgio->pg_lseg == NULL) {
63d8a41b
TM		 2741 pgio->pg_lseg =
2742 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
2743 req_offset(req), wb_size, IOMODE_RW,
2744 false, nfs_io_gfp_mask());
d600ad1f
PT		 2745 if (IS_ERR(pgio->pg_lseg)) {
2746 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2747 pgio->pg_lseg = NULL;
2748 return;
2749 }
2750 }
e885de1a
TM		 2751 /* If no lseg, fall back to write through mds */
2752 if (pgio->pg_lseg == NULL)
1f945357 2753 nfs_pageio_reset_write_mds(pgio);
d8007d4d
TM		 2754}
2755EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2756
180bb5ec
WAA		 2757void
2758pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2759{
2760 if (desc->pg_lseg) {
2761 pnfs_put_lseg(desc->pg_lseg);
2762 desc->pg_lseg = NULL;
2763 }
2764}
2765EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2766
b4fdac1a
WAA		 2767/*
2768 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2769 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2770 */
2771size_t
a7d42ddb
WAA		 2772pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2773 struct nfs_page *prev, struct nfs_page *req)
94ad1c80 2774{
0f9c429e 2775 unsigned int size;
c5e20cb7 2776 u64 seg_end, req_start, seg_left;
0f9c429e
WAA		 2777
2778 size = nfs_generic_pg_test(pgio, prev, req);
0f9c429e
WAA		 2779 if (!size)
2780 return 0;
94ad1c80 2781
19982ba8 2782 /*
c5e20cb7
WAA		 2783 * 'size' contains the number of bytes left in the current page (up
2784 * to the original size asked for in @req->wb_bytes).
2785 *
2786 * Calculate how many bytes are left in the layout segment
2787 * and if there are less bytes than 'size', return that instead.
19982ba8
TM		 2788 *
2789 * Please also note that 'end_offset' is actually the offset of the
2790 * first byte that lies outside the pnfs_layout_range. FIXME?
2791 *
2792 */
19b54848 2793 if (pgio->pg_lseg) {
17822b20 2794 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
c5e20cb7
WAA		 2795 pgio->pg_lseg->pls_range.length);
2796 req_start = req_offset(req);
08cb5b0f 2797
c5e20cb7 2798 /* start of request is past the last byte of this segment */
08cb5b0f 2799 if (req_start >= seg_end)
19b54848 2800 return 0;
c5e20cb7
WAA		 2801
2802 /* adjust 'size' iff there are fewer bytes left in the
2803 * segment than what nfs_generic_pg_test returned */
2804 seg_left = seg_end - req_start;
2805 if (seg_left < size)
2806 size = (unsigned int)seg_left;
19b54848 2807 }
0f9c429e 2808
19b54848 2809 return size;
94ad1c80 2810}
89a58e32 2811EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
94ad1c80 2812
53113ad3 2813int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
e2fecb21
TM		 2814{
2815 struct nfs_pageio_descriptor pgio;
e2fecb21
TM		 2816
2817 /* Resend all requests through the MDS */
53113ad3
WAA		 2818 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2819 hdr->completion_ops);
c7070113 2820 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
53113ad3 2821 return nfs_pageio_resend(&pgio, hdr);
e2fecb21 2822}
e7dd79af 2823EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
e2fecb21 2824
d45f60c6 2825static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1acbbb4e 2826{
cd841605
FI		 2827
2828 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2829 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1acbbb4e 2830 PNFS_LAYOUTRET_ON_ERROR) {
cd841605 2831 pnfs_return_layout(hdr->inode);
1acbbb4e 2832 }
6c75dc0d 2833 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
53113ad3 2834 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1acbbb4e
FI		 2835}
2836
d20581aa
BH		 2837/*
2838 * Called by non rpc-based layout drivers
2839 */
d45f60c6 2840void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
44b83799 2841{
f8417b48 2842 if (likely(!hdr->pnfs_error)) {
67af7611
TM		 2843 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2844 hdr->mds_offset + hdr->res.count);
d45f60c6 2845 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
f8417b48
KM		 2846 }
2847 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2848 if (unlikely(hdr->pnfs_error))
d45f60c6
WAA		 2849 pnfs_ld_handle_write_error(hdr);
2850 hdr->mds_ops->rpc_release(hdr);
44b83799 2851}
d20581aa 2852EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
44b83799 2853
dce81290
TM		 2854static void
2855pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
d45f60c6 2856 struct nfs_pgio_header *hdr)
dce81290 2857{
48d635f1 2858 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
a7d42ddb 2859
6c75dc0d 2860 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
a7d42ddb 2861 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
6c75dc0d 2862 nfs_pageio_reset_write_mds(desc);
a7d42ddb 2863 mirror->pg_recoalesce = 1;
6c75dc0d 2864 }
ba4a76f7 2865 hdr->completion_ops->completion(hdr);
dce81290
TM		 2866}
2867
2868static enum pnfs_try_status
d45f60c6 2869pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
dce81290
TM		 2870 const struct rpc_call_ops *call_ops,
2871 struct pnfs_layout_segment *lseg,
2872 int how)
0382b744 2873{
cd841605 2874 struct inode *inode = hdr->inode;
0382b744
AA		 2875 enum pnfs_try_status trypnfs;
2876 struct nfs_server *nfss = NFS_SERVER(inode);
2877
cd841605 2878 hdr->mds_ops = call_ops;
0382b744
AA		 2879
2880 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
d45f60c6
WAA		 2881 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2882 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
6c75dc0d 2883 if (trypnfs != PNFS_NOT_ATTEMPTED)
0382b744 2884 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
0382b744
AA		 2885 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2886 return trypnfs;
2887}
2888
dce81290 2889static void
7f714720
WAA		 2890pnfs_do_write(struct nfs_pageio_descriptor *desc,
2891 struct nfs_pgio_header *hdr, int how)
dce81290 2892{
dce81290
TM		 2893 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2894 struct pnfs_layout_segment *lseg = desc->pg_lseg;
7f714720 2895 enum pnfs_try_status trypnfs;
dce81290 2896
d45f60c6 2897 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
37f8aa16
TM		 2898 switch (trypnfs) {
2899 case PNFS_NOT_ATTEMPTED:
d45f60c6 2900 pnfs_write_through_mds(desc, hdr);
ffb81717 2901 break;
37f8aa16
TM		 2902 case PNFS_ATTEMPTED:
2903 break;
2904 case PNFS_TRY_AGAIN:
2905 /* cleanup hdr and prepare to redo pnfs */
2906 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2907 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2908 list_splice_init(&hdr->pages, &mirror->pg_list);
2909 mirror->pg_recoalesce = 1;
2910 }
2911 hdr->mds_ops->rpc_release(hdr);
2912 }
dce81290
TM		 2913}
2914
6c75dc0d
FI		 2915static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2916{
9369a431 2917 pnfs_put_lseg(hdr->lseg);
1e7f3a48 2918 nfs_pgio_header_free(hdr);
6c75dc0d
FI		 2919}
2920
dce81290
TM		 2921int
2922pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2923{
6c75dc0d 2924 struct nfs_pgio_header *hdr;
dce81290
TM		 2925 int ret;
2926
1e7f3a48
WAA		 2927 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2928 if (!hdr) {
2bff2288
PT		 2929 desc->pg_error = -ENOMEM;
2930 return desc->pg_error;
dce81290 2931 }
6c75dc0d 2932 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
180bb5ec 2933
9369a431 2934 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
ef2c488c 2935 ret = nfs_generic_pgio(desc, hdr);
180bb5ec 2936 if (!ret)
7f714720 2937 pnfs_do_write(desc, hdr, desc->pg_ioflags);
a7d42ddb 2938
6c75dc0d 2939 return ret;
dce81290
TM		 2940}
2941EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2942
53113ad3 2943int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
62e4a769
TM		 2944{
2945 struct nfs_pageio_descriptor pgio;
2946
1acbbb4e 2947 /* Resend all requests through the MDS */
53113ad3
WAA		 2948 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2949 return nfs_pageio_resend(&pgio, hdr);
1acbbb4e 2950}
e7dd79af 2951EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1acbbb4e 2952
d45f60c6 2953static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
1acbbb4e 2954{
cd841605
FI		 2955 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2956 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1acbbb4e 2957 PNFS_LAYOUTRET_ON_ERROR) {
cd841605 2958 pnfs_return_layout(hdr->inode);
1acbbb4e 2959 }
4db6e0b7 2960 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
53113ad3 2961 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
62e4a769
TM		 2962}
2963
d20581aa
BH		 2964/*
2965 * Called by non rpc-based layout drivers
2966 */
d45f60c6 2967void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
d20581aa 2968{
bfc505de 2969 if (likely(!hdr->pnfs_error))
d45f60c6 2970 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
f8417b48
KM		 2971 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2972 if (unlikely(hdr->pnfs_error))
d45f60c6
WAA		 2973 pnfs_ld_handle_read_error(hdr);
2974 hdr->mds_ops->rpc_release(hdr);
d20581aa
BH		 2975}
2976EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2977
493292dd
TM		 2978static void
2979pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
d45f60c6 2980 struct nfs_pgio_header *hdr)
493292dd 2981{
48d635f1 2982 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
a7d42ddb 2983
4db6e0b7 2984 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
a7d42ddb 2985 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
4db6e0b7 2986 nfs_pageio_reset_read_mds(desc);
a7d42ddb 2987 mirror->pg_recoalesce = 1;
4db6e0b7 2988 }
ba4a76f7 2989 hdr->completion_ops->completion(hdr);
493292dd
TM		 2990}
2991
64419a9b
AA		 2992/*
2993 * Call the appropriate parallel I/O subsystem read function.
2994 */
493292dd 2995static enum pnfs_try_status
d45f60c6 2996pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
493292dd
TM		 2997 const struct rpc_call_ops *call_ops,
2998 struct pnfs_layout_segment *lseg)
64419a9b 2999{
cd841605 3000 struct inode *inode = hdr->inode;
64419a9b
AA		 3001 struct nfs_server *nfss = NFS_SERVER(inode);
3002 enum pnfs_try_status trypnfs;
3003
cd841605 3004 hdr->mds_ops = call_ops;
64419a9b
AA		 3005
3006 dprintk("%s: Reading ino:%lu %u@%llu\n",
d45f60c6 3007 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
64419a9b 3008
d45f60c6 3009 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
4db6e0b7 3010 if (trypnfs != PNFS_NOT_ATTEMPTED)
64419a9b 3011 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
64419a9b
AA		 3012 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
3013 return trypnfs;
3014}
863a3c6c 3015
ceb11e13 3016/* Resend all requests through pnfs. */
563c53e7
TM		 3017void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr,
3018 unsigned int mirror_idx)
ceb11e13
PT		 3019{
3020 struct nfs_pageio_descriptor pgio;
3021
1b1bc66b 3022 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
54e4a0df
TM		 3023 /* Prevent deadlocks with layoutreturn! */
3024 pnfs_put_lseg(hdr->lseg);
3025 hdr->lseg = NULL;
3026
1b1bc66b
WAA		 3027 nfs_pageio_init_read(&pgio, hdr->inode, false,
3028 hdr->completion_ops);
563c53e7 3029 pgio.pg_mirror_idx = mirror_idx;
1b1bc66b
WAA		 3030 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
3031 }
ceb11e13
PT		 3032}
3033EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
3034
493292dd 3035static void
7f714720 3036pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
493292dd 3037{
493292dd
TM		 3038 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
3039 struct pnfs_layout_segment *lseg = desc->pg_lseg;
7f714720 3040 enum pnfs_try_status trypnfs;
493292dd 3041
d45f60c6 3042 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
6aeafd05
TM		 3043 switch (trypnfs) {
3044 case PNFS_NOT_ATTEMPTED:
d45f60c6 3045 pnfs_read_through_mds(desc, hdr);
ffb81717 3046 break;
6aeafd05
TM		 3047 case PNFS_ATTEMPTED:
3048 break;
3049 case PNFS_TRY_AGAIN:
3050 /* cleanup hdr and prepare to redo pnfs */
3051 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3052 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
3053 list_splice_init(&hdr->pages, &mirror->pg_list);
3054 mirror->pg_recoalesce = 1;
3055 }
3056 hdr->mds_ops->rpc_release(hdr);
3057 }
493292dd
TM		 3058}
3059
4db6e0b7
FI		 3060static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
3061{
9369a431 3062 pnfs_put_lseg(hdr->lseg);
1e7f3a48 3063 nfs_pgio_header_free(hdr);
4db6e0b7
FI		 3064}
3065
493292dd
TM		 3066int
3067pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
3068{
4db6e0b7 3069 struct nfs_pgio_header *hdr;
493292dd
TM		 3070 int ret;
3071
1e7f3a48
WAA		 3072 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
3073 if (!hdr) {
2bff2288
PT		 3074 desc->pg_error = -ENOMEM;
3075 return desc->pg_error;
493292dd 3076 }
4db6e0b7 3077 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
9369a431 3078 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
ef2c488c 3079 ret = nfs_generic_pgio(desc, hdr);
180bb5ec 3080 if (!ret)
7f714720 3081 pnfs_do_read(desc, hdr);
4db6e0b7 3082 return ret;
493292dd
TM		 3083}
3084EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
3085
71244d9b
TM		 3086static void pnfs_clear_layoutcommitting(struct inode *inode)
3087{
3088 unsigned long *bitlock = &NFS_I(inode)->flags;
3089
3090 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
4e857c58 3091 smp_mb__after_atomic();
71244d9b
TM		 3092 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
3093}
3094
863a3c6c 3095/*
a9bae566 3096 * There can be multiple RW segments.
863a3c6c 3097 */
a9bae566 3098static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
863a3c6c 3099{
a9bae566 3100 struct pnfs_layout_segment *lseg;
863a3c6c 3101
a9bae566
PT		 3102 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
3103 if (lseg->pls_range.iomode == IOMODE_RW &&
a073dbff 3104 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
a9bae566
PT		 3105 list_add(&lseg->pls_lc_list, listp);
3106 }
863a3c6c
AA		 3107}
3108
a073dbff
TM		 3109static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
3110{
3111 struct pnfs_layout_segment *lseg, *tmp;
a073dbff
TM		 3112
3113 /* Matched by references in pnfs_set_layoutcommit */
3114 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
3115 list_del_init(&lseg->pls_lc_list);
3116 pnfs_put_lseg(lseg);
3117 }
3118
71244d9b 3119 pnfs_clear_layoutcommitting(inode);
a073dbff
TM		 3120}
3121
1b0ae068
PT		 3122void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
3123{
b9e028fd 3124 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
1b0ae068
PT		 3125}
3126EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
3127
863a3c6c 3128void
67af7611
TM		 3129pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
3130 loff_t end_pos)
863a3c6c 3131{
cd841605 3132 struct nfs_inode *nfsi = NFS_I(inode);
79a48a1f 3133 bool mark_as_dirty = false;
863a3c6c 3134
cd841605 3135 spin_lock(&inode->i_lock);
863a3c6c 3136 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
29559b11 3137 nfsi->layout->plh_lwb = end_pos;
79a48a1f 3138 mark_as_dirty = true;
863a3c6c 3139 dprintk("%s: Set layoutcommit for inode %lu ",
cd841605 3140 __func__, inode->i_ino);
29559b11
TM		 3141 } else if (end_pos > nfsi->layout->plh_lwb)
3142 nfsi->layout->plh_lwb = end_pos;
67af7611 3143 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
a9bae566 3144 /* references matched in nfs4_layoutcommit_release */
67af7611 3145 pnfs_get_lseg(lseg);
a9bae566 3146 }
cd841605 3147 spin_unlock(&inode->i_lock);
acff5880 3148 dprintk("%s: lseg %p end_pos %llu\n",
67af7611 3149 __func__, lseg, nfsi->layout->plh_lwb);
79a48a1f
WAA		 3150
3151 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
3152 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
3153 if (mark_as_dirty)
cd841605 3154 mark_inode_dirty_sync(inode);
863a3c6c
AA		 3155}
3156EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
3157
db29c089
AA		 3158void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
3159{
3160 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
3161
3162 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
3163 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
a073dbff 3164 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
db29c089
AA		 3165}
3166
de4b15c7
AA		 3167/*
3168 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3169 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
3170 * data to disk to allow the server to recover the data if it crashes.
3171 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
3172 * is off, and a COMMIT is sent to a data server, or
3173 * if WRITEs to a data server return NFS_DATA_SYNC.
3174 */
863a3c6c 3175int
ef311537 3176pnfs_layoutcommit_inode(struct inode *inode, bool sync)
863a3c6c 3177{
5f919c9f 3178 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
863a3c6c
AA		 3179 struct nfs4_layoutcommit_data *data;
3180 struct nfs_inode *nfsi = NFS_I(inode);
863a3c6c 3181 loff_t end_pos;
71244d9b 3182 int status;
863a3c6c 3183
71244d9b 3184 if (!pnfs_layoutcommit_outstanding(inode))
de4b15c7
AA		 3185 return 0;
3186
71244d9b 3187 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
92407e75 3188
71244d9b 3189 status = -EAGAIN;
92407e75 3190 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
71244d9b
TM		 3191 if (!sync)
3192 goto out;
74316201 3193 status = wait_on_bit_lock_action(&nfsi->flags,
71244d9b
TM		 3194 NFS_INO_LAYOUTCOMMITTING,
3195 nfs_wait_bit_killable,
3196 TASK_KILLABLE);
92407e75 3197 if (status)
71244d9b 3198 goto out;
92407e75
PT		 3199 }
3200
71244d9b
TM		 3201 status = -ENOMEM;
3202 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
63d8a41b 3203 data = kzalloc(sizeof(*data), nfs_io_gfp_mask());
71244d9b
TM		 3204 if (!data)
3205 goto clear_layoutcommitting;
3206
3207 status = 0;
de4b15c7 3208 spin_lock(&inode->i_lock);
71244d9b
TM		 3209 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
3210 goto out_unlock;
a9bae566 3211
71244d9b 3212 INIT_LIST_HEAD(&data->lseg_list);
a9bae566 3213 pnfs_list_write_lseg(inode, &data->lseg_list);
863a3c6c 3214
acff5880 3215 end_pos = nfsi->layout->plh_lwb;
863a3c6c 3216
f597c537 3217 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
97a728f5 3218 data->cred = get_cred(nfsi->layout->plh_lc_cred);
863a3c6c
AA		 3219 spin_unlock(&inode->i_lock);
3220
3221 data->args.inode = inode;
863a3c6c
AA		 3222 nfs_fattr_init(&data->fattr);
3223 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3224 data->res.fattr = &data->fattr;
2e18d4d8
TM		 3225 if (end_pos != 0)
3226 data->args.lastbytewritten = end_pos - 1;
3227 else
3228 data->args.lastbytewritten = U64_MAX;
863a3c6c
AA		 3229 data->res.server = NFS_SERVER(inode);
3230
5f919c9f
CH		 3231 if (ld->prepare_layoutcommit) {
3232 status = ld->prepare_layoutcommit(&data->args);
3233 if (status) {
a52458b4 3234 put_cred(data->cred);
5f919c9f 3235 spin_lock(&inode->i_lock);
29559b11
TM		 3236 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3237 if (end_pos > nfsi->layout->plh_lwb)
5f919c9f 3238 nfsi->layout->plh_lwb = end_pos;
3471648a 3239 goto out_unlock;
5f919c9f
CH		 3240 }
3241 }
3242
3243
863a3c6c
AA		 3244 status = nfs4_proc_layoutcommit(data, sync);
3245out:
92407e75
PT		 3246 if (status)
3247 mark_inode_dirty_sync(inode);
863a3c6c
AA		 3248 dprintk("<-- %s status %d\n", __func__, status);
3249 return status;
71244d9b
TM		 3250out_unlock:
3251 spin_unlock(&inode->i_lock);
92407e75 3252 kfree(data);
71244d9b
TM		 3253clear_layoutcommitting:
3254 pnfs_clear_layoutcommitting(inode);
92407e75 3255 goto out;
863a3c6c 3256}
72cff449 3257EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
82be417a 3258
5bb89b47
TM		 3259int
3260pnfs_generic_sync(struct inode *inode, bool datasync)
3261{
3262 return pnfs_layoutcommit_inode(inode, true);
3263}
3264EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3265
82be417a
AA		 3266struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3267{
3268 struct nfs4_threshold *thp;
3269
63d8a41b 3270 thp = kzalloc(sizeof(*thp), nfs_io_gfp_mask());
82be417a
AA		 3271 if (!thp) {
3272 dprintk("%s mdsthreshold allocation failed\n", __func__);
3273 return NULL;
3274 }
3275 return thp;
3276}
8733408d 3277
865a7ecb 3278#if IS_ENABLED(CONFIG_NFS_V4_2)
8733408d 3279int
c8ad8894 3280pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
8733408d
PT		 3281{
3282 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3283 struct nfs_server *server = NFS_SERVER(inode);
1bfe3b25 3284 struct nfs_inode *nfsi = NFS_I(inode);
8733408d
PT		 3285 struct nfs42_layoutstat_data *data;
3286 struct pnfs_layout_hdr *hdr;
3287 int status = 0;
3288
3289 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3290 goto out;
3291
6c5a0d89
TM		 3292 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3293 goto out;
3294
1bfe3b25
PT		 3295 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3296 goto out;
3297
8733408d
PT		 3298 spin_lock(&inode->i_lock);
3299 if (!NFS_I(inode)->layout) {
3300 spin_unlock(&inode->i_lock);
f538d0ba 3301 goto out_clear_layoutstats;
8733408d
PT		 3302 }
3303 hdr = NFS_I(inode)->layout;
3304 pnfs_get_layout_hdr(hdr);
3305 spin_unlock(&inode->i_lock);
3306
c8ad8894 3307 data = kzalloc(sizeof(*data), gfp_flags);
8733408d
PT		 3308 if (!data) {
3309 status = -ENOMEM;
3310 goto out_put;
3311 }
3312
3313 data->args.fh = NFS_FH(inode);
3314 data->args.inode = inode;
8733408d
PT		 3315 status = ld->prepare_layoutstats(&data->args);
3316 if (status)
3317 goto out_free;
3318
3319 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3320
3321out:
3322 dprintk("%s returns %d\n", __func__, status);
3323 return status;
3324
3325out_free:
3326 kfree(data);
3327out_put:
3328 pnfs_put_layout_hdr(hdr);
f538d0ba 3329out_clear_layoutstats:
1bfe3b25
PT		 3330 smp_mb__before_atomic();
3331 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3332 smp_mb__after_atomic();
8733408d
PT		 3333 goto out;
3334}
3335EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
865a7ecb 3336#endif
bbf58bf3
TM		 3337
3338unsigned int layoutstats_timer;
3339module_param(layoutstats_timer, uint, 0644);
3340EXPORT_SYMBOL_GPL(layoutstats_timer);
Linux 6.x block layer and io_uring tree(s)