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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>
31#include <linux/nfs_page.h>
32#include <linux/module.h>
33#include <linux/sort.h>
34#include "internal.h"
35#include "pnfs.h"
36#include "iostat.h"
37#include "nfs4trace.h"
38#include "delegation.h"
39#include "nfs42.h"
40#include "nfs4_fs.h"
41
42#define NFSDBG_FACILITY NFSDBG_PNFS
43#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
44
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
57static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
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);
62static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
63 struct list_head *tmp_list);
64
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
80static struct pnfs_layoutdriver_type *
81find_pnfs_driver(u32 id)
82{
83 struct pnfs_layoutdriver_type *local;
84
85 spin_lock(&pnfs_spinlock);
86 local = find_pnfs_driver_locked(id);
87 if (local != NULL && !try_module_get(local->owner)) {
88 dprintk("%s: Could not grab reference on module\n", __func__);
89 local = NULL;
90 }
91 spin_unlock(&pnfs_spinlock);
92 return local;
93}
94
95void
96unset_pnfs_layoutdriver(struct nfs_server *nfss)
97{
98 if (nfss->pnfs_curr_ld) {
99 if (nfss->pnfs_curr_ld->clear_layoutdriver)
100 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
101 /* Decrement the MDS count. Purge the deviceid cache if zero */
102 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
103 nfs4_deviceid_purge_client(nfss->nfs_client);
104 module_put(nfss->pnfs_curr_ld->owner);
105 }
106 nfss->pnfs_curr_ld = NULL;
107}
108
109/*
110 * When the server sends a list of layout types, we choose one in the order
111 * given in the list below.
112 *
113 * FIXME: should this list be configurable in some fashion? module param?
114 * mount option? something else?
115 */
116static const u32 ld_prefs[] = {
117 LAYOUT_SCSI,
118 LAYOUT_BLOCK_VOLUME,
119 LAYOUT_OSD2_OBJECTS,
120 LAYOUT_FLEX_FILES,
121 LAYOUT_NFSV4_1_FILES,
122 0
123};
124
125static int
126ld_cmp(const void *e1, const void *e2)
127{
128 u32 ld1 = *((u32 *)e1);
129 u32 ld2 = *((u32 *)e2);
130 int i;
131
132 for (i = 0; ld_prefs[i] != 0; i++) {
133 if (ld1 == ld_prefs[i])
134 return -1;
135
136 if (ld2 == ld_prefs[i])
137 return 1;
138 }
139 return 0;
140}
141
142/*
143 * Try to set the server's pnfs module to the pnfs layout type specified by id.
144 * Currently only one pNFS layout driver per filesystem is supported.
145 *
146 * @ids array of layout types supported by MDS.
147 */
148void
149set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
150 struct nfs_fsinfo *fsinfo)
151{
152 struct pnfs_layoutdriver_type *ld_type = NULL;
153 u32 id;
154 int i;
155
156 if (fsinfo->nlayouttypes == 0)
157 goto out_no_driver;
158 if (!(server->nfs_client->cl_exchange_flags &
159 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
160 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
161 __func__, server->nfs_client->cl_exchange_flags);
162 goto out_no_driver;
163 }
164
165 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
166 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
167
168 for (i = 0; i < fsinfo->nlayouttypes; i++) {
169 id = fsinfo->layouttype[i];
170 ld_type = find_pnfs_driver(id);
171 if (!ld_type) {
172 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
173 id);
174 ld_type = find_pnfs_driver(id);
175 }
176 if (ld_type)
177 break;
178 }
179
180 if (!ld_type) {
181 dprintk("%s: No pNFS module found!\n", __func__);
182 goto out_no_driver;
183 }
184
185 server->pnfs_curr_ld = ld_type;
186 if (ld_type->set_layoutdriver
187 && ld_type->set_layoutdriver(server, mntfh)) {
188 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
189 "driver %u.\n", __func__, id);
190 module_put(ld_type->owner);
191 goto out_no_driver;
192 }
193 /* Bump the MDS count */
194 atomic_inc(&server->nfs_client->cl_mds_count);
195
196 dprintk("%s: pNFS module for %u set\n", __func__, id);
197 return;
198
199out_no_driver:
200 dprintk("%s: Using NFSv4 I/O\n", __func__);
201 server->pnfs_curr_ld = NULL;
202}
203
204int
205pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
206{
207 int status = -EINVAL;
208 struct pnfs_layoutdriver_type *tmp;
209
210 if (ld_type->id == 0) {
211 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
212 return status;
213 }
214 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
215 printk(KERN_ERR "NFS: %s Layout driver must provide "
216 "alloc_lseg and free_lseg.\n", __func__);
217 return status;
218 }
219
220 spin_lock(&pnfs_spinlock);
221 tmp = find_pnfs_driver_locked(ld_type->id);
222 if (!tmp) {
223 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
224 status = 0;
225 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
226 ld_type->name);
227 } else {
228 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
229 __func__, ld_type->id);
230 }
231 spin_unlock(&pnfs_spinlock);
232
233 return status;
234}
235EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
236
237void
238pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
239{
240 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
241 spin_lock(&pnfs_spinlock);
242 list_del(&ld_type->pnfs_tblid);
243 spin_unlock(&pnfs_spinlock);
244}
245EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
246
247/*
248 * pNFS client layout cache
249 */
250
251/* Need to hold i_lock if caller does not already hold reference */
252void
253pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
254{
255 refcount_inc(&lo->plh_refcount);
256}
257
258static struct pnfs_layout_hdr *
259pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
260{
261 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
262 return ld->alloc_layout_hdr(ino, gfp_flags);
263}
264
265static void
266pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
267{
268 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
269 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
270
271 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
272 struct nfs_client *clp = server->nfs_client;
273
274 spin_lock(&clp->cl_lock);
275 list_del_rcu(&lo->plh_layouts);
276 spin_unlock(&clp->cl_lock);
277 }
278 put_cred(lo->plh_lc_cred);
279 return ld->free_layout_hdr(lo);
280}
281
282static void
283pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
284{
285 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
286 dprintk("%s: freeing layout cache %p\n", __func__, lo);
287 nfsi->layout = NULL;
288 /* Reset MDS Threshold I/O counters */
289 nfsi->write_io = 0;
290 nfsi->read_io = 0;
291}
292
293void
294pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
295{
296 struct inode *inode;
297 unsigned long i_state;
298
299 if (!lo)
300 return;
301 inode = lo->plh_inode;
302 pnfs_layoutreturn_before_put_layout_hdr(lo);
303
304 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
305 if (!list_empty(&lo->plh_segs))
306 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
307 pnfs_detach_layout_hdr(lo);
308 i_state = inode->i_state;
309 spin_unlock(&inode->i_lock);
310 pnfs_free_layout_hdr(lo);
311 /* Notify pnfs_destroy_layout_final() that we're done */
312 if (i_state & (I_FREEING | I_CLEAR))
313 wake_up_var(lo);
314 }
315}
316
317static struct inode *
318pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo)
319{
320 struct inode *inode = igrab(lo->plh_inode);
321 if (inode)
322 return inode;
323 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
324 return NULL;
325}
326
327/*
328 * Compare 2 layout stateid sequence ids, to see which is newer,
329 * taking into account wraparound issues.
330 */
331static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
332{
333 return (s32)(s1 - s2) > 0;
334}
335
336static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq)
337{
338 if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier)
339 lo->plh_barrier = newseq;
340}
341
342static void
343pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
344 u32 seq)
345{
346 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
347 iomode = IOMODE_ANY;
348 lo->plh_return_iomode = iomode;
349 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
350 /*
351 * We must set lo->plh_return_seq to avoid livelocks with
352 * pnfs_layout_need_return()
353 */
354 if (seq == 0)
355 seq = be32_to_cpu(lo->plh_stateid.seqid);
356 if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
357 lo->plh_return_seq = seq;
358 pnfs_barrier_update(lo, seq);
359}
360
361static void
362pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
363{
364 struct pnfs_layout_segment *lseg;
365 lo->plh_return_iomode = 0;
366 lo->plh_return_seq = 0;
367 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
368 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
369 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
370 continue;
371 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
372 }
373}
374
375static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
376{
377 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
378 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
379 smp_mb__after_atomic();
380 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
381 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
382}
383
384static void
385pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
386 struct list_head *free_me)
387{
388 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
389 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
390 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
391 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
392 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
393 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
394}
395
396/*
397 * Update the seqid of a layout stateid after receiving
398 * NFS4ERR_OLD_STATEID
399 */
400bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
401 struct pnfs_layout_range *dst_range,
402 struct inode *inode)
403{
404 struct pnfs_layout_hdr *lo;
405 struct pnfs_layout_range range = {
406 .iomode = IOMODE_ANY,
407 .offset = 0,
408 .length = NFS4_MAX_UINT64,
409 };
410 bool ret = false;
411 LIST_HEAD(head);
412 int err;
413
414 spin_lock(&inode->i_lock);
415 lo = NFS_I(inode)->layout;
416 if (lo && pnfs_layout_is_valid(lo) &&
417 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
418 /* Is our call using the most recent seqid? If so, bump it */
419 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
420 nfs4_stateid_seqid_inc(dst);
421 ret = true;
422 goto out;
423 }
424 /* Try to update the seqid to the most recent */
425 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
426 if (err != -EBUSY) {
427 dst->seqid = lo->plh_stateid.seqid;
428 *dst_range = range;
429 ret = true;
430 }
431 }
432out:
433 spin_unlock(&inode->i_lock);
434 pnfs_free_lseg_list(&head);
435 return ret;
436}
437
438/*
439 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
440 *
441 * In order to continue using the pnfs_layout_hdr, a full recovery
442 * is required.
443 * Note that caller must hold inode->i_lock.
444 */
445int
446pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
447 struct list_head *lseg_list)
448{
449 struct pnfs_layout_range range = {
450 .iomode = IOMODE_ANY,
451 .offset = 0,
452 .length = NFS4_MAX_UINT64,
453 };
454 struct pnfs_layout_segment *lseg, *next;
455
456 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
457 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
458 pnfs_clear_lseg_state(lseg, lseg_list);
459 pnfs_clear_layoutreturn_info(lo);
460 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
461 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
462 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
463 pnfs_clear_layoutreturn_waitbit(lo);
464 return !list_empty(&lo->plh_segs);
465}
466
467static int
468pnfs_iomode_to_fail_bit(u32 iomode)
469{
470 return iomode == IOMODE_RW ?
471 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
472}
473
474static void
475pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
476{
477 lo->plh_retry_timestamp = jiffies;
478 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
479 refcount_inc(&lo->plh_refcount);
480}
481
482static void
483pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
484{
485 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
486 refcount_dec(&lo->plh_refcount);
487}
488
489static void
490pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
491{
492 struct inode *inode = lo->plh_inode;
493 struct pnfs_layout_range range = {
494 .iomode = iomode,
495 .offset = 0,
496 .length = NFS4_MAX_UINT64,
497 };
498 LIST_HEAD(head);
499
500 spin_lock(&inode->i_lock);
501 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
502 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
503 spin_unlock(&inode->i_lock);
504 pnfs_free_lseg_list(&head);
505 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
506 iomode == IOMODE_RW ? "RW" : "READ");
507}
508
509static bool
510pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
511{
512 unsigned long start, end;
513 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
514
515 if (test_bit(fail_bit, &lo->plh_flags) == 0)
516 return false;
517 end = jiffies;
518 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
519 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
520 /* It is time to retry the failed layoutgets */
521 pnfs_layout_clear_fail_bit(lo, fail_bit);
522 return false;
523 }
524 return true;
525}
526
527static void
528pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
529 const struct pnfs_layout_range *range,
530 const nfs4_stateid *stateid)
531{
532 INIT_LIST_HEAD(&lseg->pls_list);
533 INIT_LIST_HEAD(&lseg->pls_lc_list);
534 INIT_LIST_HEAD(&lseg->pls_commits);
535 refcount_set(&lseg->pls_refcount, 1);
536 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
537 lseg->pls_layout = lo;
538 lseg->pls_range = *range;
539 lseg->pls_seq = be32_to_cpu(stateid->seqid);
540}
541
542static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
543{
544 if (lseg != NULL) {
545 struct inode *inode = lseg->pls_layout->plh_inode;
546 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
547 }
548}
549
550static void
551pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
552 struct pnfs_layout_segment *lseg)
553{
554 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
555 list_del_init(&lseg->pls_list);
556 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
557 refcount_dec(&lo->plh_refcount);
558 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
559 return;
560 if (list_empty(&lo->plh_segs) &&
561 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
562 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
563 if (atomic_read(&lo->plh_outstanding) == 0)
564 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
565 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
566 }
567}
568
569static bool
570pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
571 struct pnfs_layout_segment *lseg)
572{
573 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
574 pnfs_layout_is_valid(lo)) {
575 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
576 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
577 return true;
578 }
579 return false;
580}
581
582void
583pnfs_put_lseg(struct pnfs_layout_segment *lseg)
584{
585 struct pnfs_layout_hdr *lo;
586 struct inode *inode;
587
588 if (!lseg)
589 return;
590
591 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
592 refcount_read(&lseg->pls_refcount),
593 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
594
595 lo = lseg->pls_layout;
596 inode = lo->plh_inode;
597
598 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
599 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
600 spin_unlock(&inode->i_lock);
601 return;
602 }
603 pnfs_get_layout_hdr(lo);
604 pnfs_layout_remove_lseg(lo, lseg);
605 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
606 lseg = NULL;
607 spin_unlock(&inode->i_lock);
608 pnfs_free_lseg(lseg);
609 pnfs_put_layout_hdr(lo);
610 }
611}
612EXPORT_SYMBOL_GPL(pnfs_put_lseg);
613
614/*
615 * is l2 fully contained in l1?
616 * start1 end1
617 * [----------------------------------)
618 * start2 end2
619 * [----------------)
620 */
621static bool
622pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
623 const struct pnfs_layout_range *l2)
624{
625 u64 start1 = l1->offset;
626 u64 end1 = pnfs_end_offset(start1, l1->length);
627 u64 start2 = l2->offset;
628 u64 end2 = pnfs_end_offset(start2, l2->length);
629
630 return (start1 <= start2) && (end1 >= end2);
631}
632
633static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
634 struct list_head *tmp_list)
635{
636 if (!refcount_dec_and_test(&lseg->pls_refcount))
637 return false;
638 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
639 list_add(&lseg->pls_list, tmp_list);
640 return true;
641}
642
643/* Returns 1 if lseg is removed from list, 0 otherwise */
644static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
645 struct list_head *tmp_list)
646{
647 int rv = 0;
648
649 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
650 /* Remove the reference keeping the lseg in the
651 * list. It will now be removed when all
652 * outstanding io is finished.
653 */
654 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
655 refcount_read(&lseg->pls_refcount));
656 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
657 rv = 1;
658 }
659 return rv;
660}
661
662static bool
663pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
664 const struct pnfs_layout_range *recall_range)
665{
666 return (recall_range->iomode == IOMODE_ANY ||
667 lseg_range->iomode == recall_range->iomode) &&
668 pnfs_lseg_range_intersecting(lseg_range, recall_range);
669}
670
671static bool
672pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
673 const struct pnfs_layout_range *recall_range,
674 u32 seq)
675{
676 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
677 return false;
678 if (recall_range == NULL)
679 return true;
680 return pnfs_should_free_range(&lseg->pls_range, recall_range);
681}
682
683/**
684 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
685 * @lo: layout header containing the lsegs
686 * @tmp_list: list head where doomed lsegs should go
687 * @recall_range: optional recall range argument to match (may be NULL)
688 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
689 *
690 * Walk the list of lsegs in the layout header, and tear down any that should
691 * be destroyed. If "recall_range" is specified then the segment must match
692 * that range. If "seq" is non-zero, then only match segments that were handed
693 * out at or before that sequence.
694 *
695 * Returns number of matching invalid lsegs remaining in list after scanning
696 * it and purging them.
697 */
698int
699pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
700 struct list_head *tmp_list,
701 const struct pnfs_layout_range *recall_range,
702 u32 seq)
703{
704 struct pnfs_layout_segment *lseg, *next;
705 int remaining = 0;
706
707 dprintk("%s:Begin lo %p\n", __func__, lo);
708
709 if (list_empty(&lo->plh_segs))
710 return 0;
711 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
712 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
713 dprintk("%s: freeing lseg %p iomode %d seq %u "
714 "offset %llu length %llu\n", __func__,
715 lseg, lseg->pls_range.iomode, lseg->pls_seq,
716 lseg->pls_range.offset, lseg->pls_range.length);
717 if (!mark_lseg_invalid(lseg, tmp_list))
718 remaining++;
719 }
720 dprintk("%s:Return %i\n", __func__, remaining);
721 return remaining;
722}
723
724static void
725pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
726 struct list_head *free_me,
727 const struct pnfs_layout_range *range,
728 u32 seq)
729{
730 struct pnfs_layout_segment *lseg, *next;
731
732 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
733 if (pnfs_match_lseg_recall(lseg, range, seq))
734 list_move_tail(&lseg->pls_list, free_me);
735 }
736}
737
738/* note free_me must contain lsegs from a single layout_hdr */
739void
740pnfs_free_lseg_list(struct list_head *free_me)
741{
742 struct pnfs_layout_segment *lseg, *tmp;
743
744 if (list_empty(free_me))
745 return;
746
747 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
748 list_del(&lseg->pls_list);
749 pnfs_free_lseg(lseg);
750 }
751}
752
753static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi)
754{
755 struct pnfs_layout_hdr *lo;
756 LIST_HEAD(tmp_list);
757
758 spin_lock(&nfsi->vfs_inode.i_lock);
759 lo = nfsi->layout;
760 if (lo) {
761 pnfs_get_layout_hdr(lo);
762 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
763 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
764 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
765 spin_unlock(&nfsi->vfs_inode.i_lock);
766 pnfs_free_lseg_list(&tmp_list);
767 nfs_commit_inode(&nfsi->vfs_inode, 0);
768 pnfs_put_layout_hdr(lo);
769 } else
770 spin_unlock(&nfsi->vfs_inode.i_lock);
771 return lo;
772}
773
774void pnfs_destroy_layout(struct nfs_inode *nfsi)
775{
776 __pnfs_destroy_layout(nfsi);
777}
778EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
779
780static bool pnfs_layout_removed(struct nfs_inode *nfsi,
781 struct pnfs_layout_hdr *lo)
782{
783 bool ret;
784
785 spin_lock(&nfsi->vfs_inode.i_lock);
786 ret = nfsi->layout != lo;
787 spin_unlock(&nfsi->vfs_inode.i_lock);
788 return ret;
789}
790
791void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
792{
793 struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi);
794
795 if (lo)
796 wait_var_event(lo, pnfs_layout_removed(nfsi, lo));
797}
798
799static bool
800pnfs_layout_add_bulk_destroy_list(struct inode *inode,
801 struct list_head *layout_list)
802{
803 struct pnfs_layout_hdr *lo;
804 bool ret = false;
805
806 spin_lock(&inode->i_lock);
807 lo = NFS_I(inode)->layout;
808 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
809 pnfs_get_layout_hdr(lo);
810 list_add(&lo->plh_bulk_destroy, layout_list);
811 ret = true;
812 }
813 spin_unlock(&inode->i_lock);
814 return ret;
815}
816
817/* Caller must hold rcu_read_lock and clp->cl_lock */
818static int
819pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
820 struct nfs_server *server,
821 struct list_head *layout_list)
822 __must_hold(&clp->cl_lock)
823 __must_hold(RCU)
824{
825 struct pnfs_layout_hdr *lo, *next;
826 struct inode *inode;
827
828 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
829 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
830 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
831 !list_empty(&lo->plh_bulk_destroy))
832 continue;
833 /* If the sb is being destroyed, just bail */
834 if (!nfs_sb_active(server->super))
835 break;
836 inode = pnfs_grab_inode_layout_hdr(lo);
837 if (inode != NULL) {
838 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags))
839 list_del_rcu(&lo->plh_layouts);
840 if (pnfs_layout_add_bulk_destroy_list(inode,
841 layout_list))
842 continue;
843 rcu_read_unlock();
844 spin_unlock(&clp->cl_lock);
845 iput(inode);
846 } else {
847 rcu_read_unlock();
848 spin_unlock(&clp->cl_lock);
849 }
850 nfs_sb_deactive(server->super);
851 spin_lock(&clp->cl_lock);
852 rcu_read_lock();
853 return -EAGAIN;
854 }
855 return 0;
856}
857
858static int
859pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
860 bool is_bulk_recall)
861{
862 struct pnfs_layout_hdr *lo;
863 struct inode *inode;
864 LIST_HEAD(lseg_list);
865 int ret = 0;
866
867 while (!list_empty(layout_list)) {
868 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
869 plh_bulk_destroy);
870 dprintk("%s freeing layout for inode %lu\n", __func__,
871 lo->plh_inode->i_ino);
872 inode = lo->plh_inode;
873
874 pnfs_layoutcommit_inode(inode, false);
875
876 spin_lock(&inode->i_lock);
877 list_del_init(&lo->plh_bulk_destroy);
878 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
879 if (is_bulk_recall)
880 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
881 ret = -EAGAIN;
882 }
883 spin_unlock(&inode->i_lock);
884 pnfs_free_lseg_list(&lseg_list);
885 /* Free all lsegs that are attached to commit buckets */
886 nfs_commit_inode(inode, 0);
887 pnfs_put_layout_hdr(lo);
888 nfs_iput_and_deactive(inode);
889 }
890 return ret;
891}
892
893int
894pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
895 struct nfs_fsid *fsid,
896 bool is_recall)
897{
898 struct nfs_server *server;
899 LIST_HEAD(layout_list);
900
901 spin_lock(&clp->cl_lock);
902 rcu_read_lock();
903restart:
904 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
905 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
906 continue;
907 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
908 server,
909 &layout_list) != 0)
910 goto restart;
911 }
912 rcu_read_unlock();
913 spin_unlock(&clp->cl_lock);
914
915 if (list_empty(&layout_list))
916 return 0;
917 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
918}
919
920int
921pnfs_destroy_layouts_byclid(struct nfs_client *clp,
922 bool is_recall)
923{
924 struct nfs_server *server;
925 LIST_HEAD(layout_list);
926
927 spin_lock(&clp->cl_lock);
928 rcu_read_lock();
929restart:
930 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
931 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
932 server,
933 &layout_list) != 0)
934 goto restart;
935 }
936 rcu_read_unlock();
937 spin_unlock(&clp->cl_lock);
938
939 if (list_empty(&layout_list))
940 return 0;
941 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
942}
943
944/*
945 * Called by the state manager to remove all layouts established under an
946 * expired lease.
947 */
948void
949pnfs_destroy_all_layouts(struct nfs_client *clp)
950{
951 nfs4_deviceid_mark_client_invalid(clp);
952 nfs4_deviceid_purge_client(clp);
953
954 pnfs_destroy_layouts_byclid(clp, false);
955}
956
957static void
958pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred)
959{
960 const struct cred *old;
961
962 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) {
963 old = xchg(&lo->plh_lc_cred, get_cred(cred));
964 put_cred(old);
965 }
966}
967
968/* update lo->plh_stateid with new if is more recent */
969void
970pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
971 const struct cred *cred, bool update_barrier)
972{
973 u32 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
974 u32 newseq = be32_to_cpu(new->seqid);
975
976 if (!pnfs_layout_is_valid(lo)) {
977 pnfs_set_layout_cred(lo, cred);
978 nfs4_stateid_copy(&lo->plh_stateid, new);
979 lo->plh_barrier = newseq;
980 pnfs_clear_layoutreturn_info(lo);
981 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
982 return;
983 }
984
985 if (pnfs_seqid_is_newer(newseq, oldseq))
986 nfs4_stateid_copy(&lo->plh_stateid, new);
987
988 if (update_barrier) {
989 pnfs_barrier_update(lo, newseq);
990 return;
991 }
992 /*
993 * Because of wraparound, we want to keep the barrier
994 * "close" to the current seqids. We really only want to
995 * get here from a layoutget call.
996 */
997 if (atomic_read(&lo->plh_outstanding) == 1)
998 pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid));
999}
1000
1001static bool
1002pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
1003 const nfs4_stateid *stateid)
1004{
1005 u32 seqid = be32_to_cpu(stateid->seqid);
1006
1007 return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid);
1008}
1009
1010/* lget is set to 1 if called from inside send_layoutget call chain */
1011static bool
1012pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
1013{
1014 return lo->plh_block_lgets ||
1015 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
1016}
1017
1018static struct nfs_server *
1019pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
1020{
1021 struct nfs_server *server;
1022
1023 if (inode) {
1024 server = NFS_SERVER(inode);
1025 } else {
1026 struct dentry *parent_dir = dget_parent(ctx->dentry);
1027 server = NFS_SERVER(parent_dir->d_inode);
1028 dput(parent_dir);
1029 }
1030 return server;
1031}
1032
1033static void nfs4_free_pages(struct page **pages, size_t size)
1034{
1035 int i;
1036
1037 if (!pages)
1038 return;
1039
1040 for (i = 0; i < size; i++) {
1041 if (!pages[i])
1042 break;
1043 __free_page(pages[i]);
1044 }
1045 kfree(pages);
1046}
1047
1048static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
1049{
1050 struct page **pages;
1051 int i;
1052
1053 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
1054 if (!pages) {
1055 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
1056 return NULL;
1057 }
1058
1059 for (i = 0; i < size; i++) {
1060 pages[i] = alloc_page(gfp_flags);
1061 if (!pages[i]) {
1062 dprintk("%s: failed to allocate page\n", __func__);
1063 nfs4_free_pages(pages, i);
1064 return NULL;
1065 }
1066 }
1067
1068 return pages;
1069}
1070
1071static struct nfs4_layoutget *
1072pnfs_alloc_init_layoutget_args(struct inode *ino,
1073 struct nfs_open_context *ctx,
1074 const nfs4_stateid *stateid,
1075 const struct pnfs_layout_range *range,
1076 gfp_t gfp_flags)
1077{
1078 struct nfs_server *server = pnfs_find_server(ino, ctx);
1079 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1080 size_t max_pages = max_response_pages(server);
1081 struct nfs4_layoutget *lgp;
1082
1083 dprintk("--> %s\n", __func__);
1084
1085 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1086 if (lgp == NULL)
1087 return NULL;
1088
1089 if (max_reply_sz) {
1090 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1091 if (npages < max_pages)
1092 max_pages = npages;
1093 }
1094
1095 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1096 if (!lgp->args.layout.pages) {
1097 kfree(lgp);
1098 return NULL;
1099 }
1100 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1101 lgp->res.layoutp = &lgp->args.layout;
1102
1103 /* Don't confuse uninitialised result and success */
1104 lgp->res.status = -NFS4ERR_DELAY;
1105
1106 lgp->args.minlength = PAGE_SIZE;
1107 if (lgp->args.minlength > range->length)
1108 lgp->args.minlength = range->length;
1109 if (ino) {
1110 loff_t i_size = i_size_read(ino);
1111
1112 if (range->iomode == IOMODE_READ) {
1113 if (range->offset >= i_size)
1114 lgp->args.minlength = 0;
1115 else if (i_size - range->offset < lgp->args.minlength)
1116 lgp->args.minlength = i_size - range->offset;
1117 }
1118 }
1119 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1120 pnfs_copy_range(&lgp->args.range, range);
1121 lgp->args.type = server->pnfs_curr_ld->id;
1122 lgp->args.inode = ino;
1123 lgp->args.ctx = get_nfs_open_context(ctx);
1124 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1125 lgp->gfp_flags = gfp_flags;
1126 lgp->cred = ctx->cred;
1127 return lgp;
1128}
1129
1130void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1131{
1132 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1133
1134 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1135 pnfs_put_layout_hdr(lgp->lo);
1136 put_nfs_open_context(lgp->args.ctx);
1137 kfree(lgp);
1138}
1139
1140static void pnfs_clear_layoutcommit(struct inode *inode,
1141 struct list_head *head)
1142{
1143 struct nfs_inode *nfsi = NFS_I(inode);
1144 struct pnfs_layout_segment *lseg, *tmp;
1145
1146 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1147 return;
1148 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1149 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1150 continue;
1151 pnfs_lseg_dec_and_remove_zero(lseg, head);
1152 }
1153}
1154
1155void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1156 const nfs4_stateid *arg_stateid,
1157 const struct pnfs_layout_range *range,
1158 const nfs4_stateid *stateid)
1159{
1160 struct inode *inode = lo->plh_inode;
1161 LIST_HEAD(freeme);
1162
1163 spin_lock(&inode->i_lock);
1164 if (!pnfs_layout_is_valid(lo) ||
1165 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1166 goto out_unlock;
1167 if (stateid) {
1168 u32 seq = be32_to_cpu(arg_stateid->seqid);
1169
1170 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1171 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1172 pnfs_set_layout_stateid(lo, stateid, NULL, true);
1173 } else
1174 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1175out_unlock:
1176 pnfs_clear_layoutreturn_waitbit(lo);
1177 spin_unlock(&inode->i_lock);
1178 pnfs_free_lseg_list(&freeme);
1179
1180}
1181
1182static bool
1183pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1184 nfs4_stateid *stateid,
1185 const struct cred **cred,
1186 enum pnfs_iomode *iomode)
1187{
1188 /* Serialise LAYOUTGET/LAYOUTRETURN */
1189 if (atomic_read(&lo->plh_outstanding) != 0)
1190 return false;
1191 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1192 return false;
1193 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1194 pnfs_get_layout_hdr(lo);
1195 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1196 *cred = get_cred(lo->plh_lc_cred);
1197 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1198 if (lo->plh_return_seq != 0)
1199 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1200 if (iomode != NULL)
1201 *iomode = lo->plh_return_iomode;
1202 pnfs_clear_layoutreturn_info(lo);
1203 } else if (iomode != NULL)
1204 *iomode = IOMODE_ANY;
1205 pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid));
1206 return true;
1207}
1208
1209static void
1210pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1211 struct pnfs_layout_hdr *lo,
1212 const nfs4_stateid *stateid,
1213 enum pnfs_iomode iomode)
1214{
1215 struct inode *inode = lo->plh_inode;
1216
1217 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1218 args->inode = inode;
1219 args->range.iomode = iomode;
1220 args->range.offset = 0;
1221 args->range.length = NFS4_MAX_UINT64;
1222 args->layout = lo;
1223 nfs4_stateid_copy(&args->stateid, stateid);
1224}
1225
1226static int
1227pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo,
1228 const nfs4_stateid *stateid,
1229 const struct cred **pcred,
1230 enum pnfs_iomode iomode,
1231 bool sync)
1232{
1233 struct inode *ino = lo->plh_inode;
1234 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1235 struct nfs4_layoutreturn *lrp;
1236 const struct cred *cred = *pcred;
1237 int status = 0;
1238
1239 *pcred = NULL;
1240 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1241 if (unlikely(lrp == NULL)) {
1242 status = -ENOMEM;
1243 spin_lock(&ino->i_lock);
1244 pnfs_clear_layoutreturn_waitbit(lo);
1245 spin_unlock(&ino->i_lock);
1246 put_cred(cred);
1247 pnfs_put_layout_hdr(lo);
1248 goto out;
1249 }
1250
1251 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1252 lrp->args.ld_private = &lrp->ld_private;
1253 lrp->clp = NFS_SERVER(ino)->nfs_client;
1254 lrp->cred = cred;
1255 if (ld->prepare_layoutreturn)
1256 ld->prepare_layoutreturn(&lrp->args);
1257
1258 status = nfs4_proc_layoutreturn(lrp, sync);
1259out:
1260 dprintk("<-- %s status: %d\n", __func__, status);
1261 return status;
1262}
1263
1264static bool
1265pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo,
1266 enum pnfs_iomode iomode,
1267 u32 seq)
1268{
1269 struct pnfs_layout_range recall_range = {
1270 .length = NFS4_MAX_UINT64,
1271 .iomode = iomode,
1272 };
1273 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
1274 &recall_range, seq) != -EBUSY;
1275}
1276
1277/* Return true if layoutreturn is needed */
1278static bool
1279pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1280{
1281 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1282 return false;
1283 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode,
1284 lo->plh_return_seq);
1285}
1286
1287static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1288{
1289 struct inode *inode= lo->plh_inode;
1290
1291 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1292 return;
1293 spin_lock(&inode->i_lock);
1294 if (pnfs_layout_need_return(lo)) {
1295 const struct cred *cred;
1296 nfs4_stateid stateid;
1297 enum pnfs_iomode iomode;
1298 bool send;
1299
1300 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
1301 spin_unlock(&inode->i_lock);
1302 if (send) {
1303 /* Send an async layoutreturn so we dont deadlock */
1304 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
1305 }
1306 } else
1307 spin_unlock(&inode->i_lock);
1308}
1309
1310/*
1311 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1312 * when the layout segment list is empty.
1313 *
1314 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1315 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1316 * deviceid is marked invalid.
1317 */
1318int
1319_pnfs_return_layout(struct inode *ino)
1320{
1321 struct pnfs_layout_hdr *lo = NULL;
1322 struct nfs_inode *nfsi = NFS_I(ino);
1323 struct pnfs_layout_range range = {
1324 .iomode = IOMODE_ANY,
1325 .offset = 0,
1326 .length = NFS4_MAX_UINT64,
1327 };
1328 LIST_HEAD(tmp_list);
1329 const struct cred *cred;
1330 nfs4_stateid stateid;
1331 int status = 0;
1332 bool send, valid_layout;
1333
1334 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1335
1336 spin_lock(&ino->i_lock);
1337 lo = nfsi->layout;
1338 if (!lo) {
1339 spin_unlock(&ino->i_lock);
1340 dprintk("NFS: %s no layout to return\n", __func__);
1341 goto out;
1342 }
1343 /* Reference matched in nfs4_layoutreturn_release */
1344 pnfs_get_layout_hdr(lo);
1345 /* Is there an outstanding layoutreturn ? */
1346 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1347 spin_unlock(&ino->i_lock);
1348 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1349 TASK_UNINTERRUPTIBLE))
1350 goto out_put_layout_hdr;
1351 spin_lock(&ino->i_lock);
1352 }
1353 valid_layout = pnfs_layout_is_valid(lo);
1354 pnfs_clear_layoutcommit(ino, &tmp_list);
1355 pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0);
1356
1357 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range)
1358 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1359
1360 /* Don't send a LAYOUTRETURN if list was initially empty */
1361 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1362 !valid_layout) {
1363 spin_unlock(&ino->i_lock);
1364 dprintk("NFS: %s no layout segments to return\n", __func__);
1365 goto out_wait_layoutreturn;
1366 }
1367
1368 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
1369 spin_unlock(&ino->i_lock);
1370 if (send)
1371 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
1372out_wait_layoutreturn:
1373 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
1374out_put_layout_hdr:
1375 pnfs_free_lseg_list(&tmp_list);
1376 pnfs_put_layout_hdr(lo);
1377out:
1378 dprintk("<-- %s status: %d\n", __func__, status);
1379 return status;
1380}
1381
1382int
1383pnfs_commit_and_return_layout(struct inode *inode)
1384{
1385 struct pnfs_layout_hdr *lo;
1386 int ret;
1387
1388 spin_lock(&inode->i_lock);
1389 lo = NFS_I(inode)->layout;
1390 if (lo == NULL) {
1391 spin_unlock(&inode->i_lock);
1392 return 0;
1393 }
1394 pnfs_get_layout_hdr(lo);
1395 /* Block new layoutgets and read/write to ds */
1396 lo->plh_block_lgets++;
1397 spin_unlock(&inode->i_lock);
1398 filemap_fdatawait(inode->i_mapping);
1399 ret = pnfs_layoutcommit_inode(inode, true);
1400 if (ret == 0)
1401 ret = _pnfs_return_layout(inode);
1402 spin_lock(&inode->i_lock);
1403 lo->plh_block_lgets--;
1404 spin_unlock(&inode->i_lock);
1405 pnfs_put_layout_hdr(lo);
1406 return ret;
1407}
1408
1409bool pnfs_roc(struct inode *ino,
1410 struct nfs4_layoutreturn_args *args,
1411 struct nfs4_layoutreturn_res *res,
1412 const struct cred *cred)
1413{
1414 struct nfs_inode *nfsi = NFS_I(ino);
1415 struct nfs_open_context *ctx;
1416 struct nfs4_state *state;
1417 struct pnfs_layout_hdr *lo;
1418 struct pnfs_layout_segment *lseg, *next;
1419 const struct cred *lc_cred;
1420 nfs4_stateid stateid;
1421 enum pnfs_iomode iomode = 0;
1422 bool layoutreturn = false, roc = false;
1423 bool skip_read = false;
1424
1425 if (!nfs_have_layout(ino))
1426 return false;
1427retry:
1428 rcu_read_lock();
1429 spin_lock(&ino->i_lock);
1430 lo = nfsi->layout;
1431 if (!lo || !pnfs_layout_is_valid(lo) ||
1432 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1433 lo = NULL;
1434 goto out_noroc;
1435 }
1436 pnfs_get_layout_hdr(lo);
1437 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1438 spin_unlock(&ino->i_lock);
1439 rcu_read_unlock();
1440 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1441 TASK_UNINTERRUPTIBLE);
1442 pnfs_put_layout_hdr(lo);
1443 goto retry;
1444 }
1445
1446 /* no roc if we hold a delegation */
1447 if (nfs4_check_delegation(ino, FMODE_READ)) {
1448 if (nfs4_check_delegation(ino, FMODE_WRITE))
1449 goto out_noroc;
1450 skip_read = true;
1451 }
1452
1453 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1454 state = ctx->state;
1455 if (state == NULL)
1456 continue;
1457 /* Don't return layout if there is open file state */
1458 if (state->state & FMODE_WRITE)
1459 goto out_noroc;
1460 if (state->state & FMODE_READ)
1461 skip_read = true;
1462 }
1463
1464
1465 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1466 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1467 continue;
1468 /* If we are sending layoutreturn, invalidate all valid lsegs */
1469 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1470 continue;
1471 /*
1472 * Note: mark lseg for return so pnfs_layout_remove_lseg
1473 * doesn't invalidate the layout for us.
1474 */
1475 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1476 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1477 continue;
1478 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1479 }
1480
1481 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1482 goto out_noroc;
1483
1484 /* ROC in two conditions:
1485 * 1. there are ROC lsegs
1486 * 2. we don't send layoutreturn
1487 */
1488 /* lo ref dropped in pnfs_roc_release() */
1489 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode);
1490 /* If the creds don't match, we can't compound the layoutreturn */
1491 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
1492 goto out_noroc;
1493
1494 roc = layoutreturn;
1495 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1496 res->lrs_present = 0;
1497 layoutreturn = false;
1498 put_cred(lc_cred);
1499
1500out_noroc:
1501 spin_unlock(&ino->i_lock);
1502 rcu_read_unlock();
1503 pnfs_layoutcommit_inode(ino, true);
1504 if (roc) {
1505 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1506 if (ld->prepare_layoutreturn)
1507 ld->prepare_layoutreturn(args);
1508 pnfs_put_layout_hdr(lo);
1509 return true;
1510 }
1511 if (layoutreturn)
1512 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true);
1513 pnfs_put_layout_hdr(lo);
1514 return false;
1515}
1516
1517int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
1518 struct nfs4_layoutreturn_res **respp, int *ret)
1519{
1520 struct nfs4_layoutreturn_args *arg = *argpp;
1521 int retval = -EAGAIN;
1522
1523 if (!arg)
1524 return 0;
1525 /* Handle Layoutreturn errors */
1526 switch (*ret) {
1527 case 0:
1528 retval = 0;
1529 break;
1530 case -NFS4ERR_NOMATCHING_LAYOUT:
1531 /* Was there an RPC level error? If not, retry */
1532 if (task->tk_rpc_status == 0)
1533 break;
1534 /* If the call was not sent, let caller handle it */
1535 if (!RPC_WAS_SENT(task))
1536 return 0;
1537 /*
1538 * Otherwise, assume the call succeeded and
1539 * that we need to release the layout
1540 */
1541 *ret = 0;
1542 (*respp)->lrs_present = 0;
1543 retval = 0;
1544 break;
1545 case -NFS4ERR_DELAY:
1546 /* Let the caller handle the retry */
1547 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1548 return 0;
1549 case -NFS4ERR_OLD_STATEID:
1550 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1551 &arg->range, arg->inode))
1552 break;
1553 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1554 return -EAGAIN;
1555 }
1556 *argpp = NULL;
1557 *respp = NULL;
1558 return retval;
1559}
1560
1561void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1562 struct nfs4_layoutreturn_res *res,
1563 int ret)
1564{
1565 struct pnfs_layout_hdr *lo = args->layout;
1566 struct inode *inode = args->inode;
1567 const nfs4_stateid *res_stateid = NULL;
1568 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1569
1570 switch (ret) {
1571 case -NFS4ERR_NOMATCHING_LAYOUT:
1572 spin_lock(&inode->i_lock);
1573 if (pnfs_layout_is_valid(lo) &&
1574 nfs4_stateid_match_other(&args->stateid, &lo->plh_stateid))
1575 pnfs_set_plh_return_info(lo, args->range.iomode, 0);
1576 pnfs_clear_layoutreturn_waitbit(lo);
1577 spin_unlock(&inode->i_lock);
1578 break;
1579 case 0:
1580 if (res->lrs_present)
1581 res_stateid = &res->stateid;
1582 fallthrough;
1583 default:
1584 pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range,
1585 res_stateid);
1586 }
1587 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret);
1588 if (ld_private && ld_private->ops && ld_private->ops->free)
1589 ld_private->ops->free(ld_private);
1590 pnfs_put_layout_hdr(lo);
1591}
1592
1593bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1594{
1595 struct nfs_inode *nfsi = NFS_I(ino);
1596 struct pnfs_layout_hdr *lo;
1597 bool sleep = false;
1598
1599 /* we might not have grabbed lo reference. so need to check under
1600 * i_lock */
1601 spin_lock(&ino->i_lock);
1602 lo = nfsi->layout;
1603 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1604 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1605 sleep = true;
1606 }
1607 spin_unlock(&ino->i_lock);
1608 return sleep;
1609}
1610
1611/*
1612 * Compare two layout segments for sorting into layout cache.
1613 * We want to preferentially return RW over RO layouts, so ensure those
1614 * are seen first.
1615 */
1616static s64
1617pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1618 const struct pnfs_layout_range *l2)
1619{
1620 s64 d;
1621
1622 /* high offset > low offset */
1623 d = l1->offset - l2->offset;
1624 if (d)
1625 return d;
1626
1627 /* short length > long length */
1628 d = l2->length - l1->length;
1629 if (d)
1630 return d;
1631
1632 /* read > read/write */
1633 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1634}
1635
1636static bool
1637pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1638 const struct pnfs_layout_range *l2)
1639{
1640 return pnfs_lseg_range_cmp(l1, l2) > 0;
1641}
1642
1643static bool
1644pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1645 struct pnfs_layout_segment *old)
1646{
1647 return false;
1648}
1649
1650void
1651pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1652 struct pnfs_layout_segment *lseg,
1653 bool (*is_after)(const struct pnfs_layout_range *,
1654 const struct pnfs_layout_range *),
1655 bool (*do_merge)(struct pnfs_layout_segment *,
1656 struct pnfs_layout_segment *),
1657 struct list_head *free_me)
1658{
1659 struct pnfs_layout_segment *lp, *tmp;
1660
1661 dprintk("%s:Begin\n", __func__);
1662
1663 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1664 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1665 continue;
1666 if (do_merge(lseg, lp)) {
1667 mark_lseg_invalid(lp, free_me);
1668 continue;
1669 }
1670 if (is_after(&lseg->pls_range, &lp->pls_range))
1671 continue;
1672 list_add_tail(&lseg->pls_list, &lp->pls_list);
1673 dprintk("%s: inserted lseg %p "
1674 "iomode %d offset %llu length %llu before "
1675 "lp %p iomode %d offset %llu length %llu\n",
1676 __func__, lseg, lseg->pls_range.iomode,
1677 lseg->pls_range.offset, lseg->pls_range.length,
1678 lp, lp->pls_range.iomode, lp->pls_range.offset,
1679 lp->pls_range.length);
1680 goto out;
1681 }
1682 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1683 dprintk("%s: inserted lseg %p "
1684 "iomode %d offset %llu length %llu at tail\n",
1685 __func__, lseg, lseg->pls_range.iomode,
1686 lseg->pls_range.offset, lseg->pls_range.length);
1687out:
1688 pnfs_get_layout_hdr(lo);
1689
1690 dprintk("%s:Return\n", __func__);
1691}
1692EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1693
1694static void
1695pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1696 struct pnfs_layout_segment *lseg,
1697 struct list_head *free_me)
1698{
1699 struct inode *inode = lo->plh_inode;
1700 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1701
1702 if (ld->add_lseg != NULL)
1703 ld->add_lseg(lo, lseg, free_me);
1704 else
1705 pnfs_generic_layout_insert_lseg(lo, lseg,
1706 pnfs_lseg_range_is_after,
1707 pnfs_lseg_no_merge,
1708 free_me);
1709}
1710
1711static struct pnfs_layout_hdr *
1712alloc_init_layout_hdr(struct inode *ino,
1713 struct nfs_open_context *ctx,
1714 gfp_t gfp_flags)
1715{
1716 struct pnfs_layout_hdr *lo;
1717
1718 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1719 if (!lo)
1720 return NULL;
1721 refcount_set(&lo->plh_refcount, 1);
1722 INIT_LIST_HEAD(&lo->plh_layouts);
1723 INIT_LIST_HEAD(&lo->plh_segs);
1724 INIT_LIST_HEAD(&lo->plh_return_segs);
1725 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1726 lo->plh_inode = ino;
1727 lo->plh_lc_cred = get_cred(ctx->cred);
1728 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1729 return lo;
1730}
1731
1732static struct pnfs_layout_hdr *
1733pnfs_find_alloc_layout(struct inode *ino,
1734 struct nfs_open_context *ctx,
1735 gfp_t gfp_flags)
1736 __releases(&ino->i_lock)
1737 __acquires(&ino->i_lock)
1738{
1739 struct nfs_inode *nfsi = NFS_I(ino);
1740 struct pnfs_layout_hdr *new = NULL;
1741
1742 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1743
1744 if (nfsi->layout != NULL)
1745 goto out_existing;
1746 spin_unlock(&ino->i_lock);
1747 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1748 spin_lock(&ino->i_lock);
1749
1750 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1751 nfsi->layout = new;
1752 return new;
1753 } else if (new != NULL)
1754 pnfs_free_layout_hdr(new);
1755out_existing:
1756 pnfs_get_layout_hdr(nfsi->layout);
1757 return nfsi->layout;
1758}
1759
1760/*
1761 * iomode matching rules:
1762 * iomode lseg strict match
1763 * iomode
1764 * ----- ----- ------ -----
1765 * ANY READ N/A true
1766 * ANY RW N/A true
1767 * RW READ N/A false
1768 * RW RW N/A true
1769 * READ READ N/A true
1770 * READ RW true false
1771 * READ RW false true
1772 */
1773static bool
1774pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1775 const struct pnfs_layout_range *range,
1776 bool strict_iomode)
1777{
1778 struct pnfs_layout_range range1;
1779
1780 if ((range->iomode == IOMODE_RW &&
1781 ls_range->iomode != IOMODE_RW) ||
1782 (range->iomode != ls_range->iomode &&
1783 strict_iomode) ||
1784 !pnfs_lseg_range_intersecting(ls_range, range))
1785 return false;
1786
1787 /* range1 covers only the first byte in the range */
1788 range1 = *range;
1789 range1.length = 1;
1790 return pnfs_lseg_range_contained(ls_range, &range1);
1791}
1792
1793/*
1794 * lookup range in layout
1795 */
1796static struct pnfs_layout_segment *
1797pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1798 struct pnfs_layout_range *range,
1799 bool strict_iomode)
1800{
1801 struct pnfs_layout_segment *lseg, *ret = NULL;
1802
1803 dprintk("%s:Begin\n", __func__);
1804
1805 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1806 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1807 pnfs_lseg_range_match(&lseg->pls_range, range,
1808 strict_iomode)) {
1809 ret = pnfs_get_lseg(lseg);
1810 break;
1811 }
1812 }
1813
1814 dprintk("%s:Return lseg %p ref %d\n",
1815 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1816 return ret;
1817}
1818
1819/*
1820 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1821 * to the MDS or over pNFS
1822 *
1823 * The nfs_inode read_io and write_io fields are cumulative counters reset
1824 * when there are no layout segments. Note that in pnfs_update_layout iomode
1825 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1826 * WRITE request.
1827 *
1828 * A return of true means use MDS I/O.
1829 *
1830 * From rfc 5661:
1831 * If a file's size is smaller than the file size threshold, data accesses
1832 * SHOULD be sent to the metadata server. If an I/O request has a length that
1833 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1834 * server. If both file size and I/O size are provided, the client SHOULD
1835 * reach or exceed both thresholds before sending its read or write
1836 * requests to the data server.
1837 */
1838static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1839 struct inode *ino, int iomode)
1840{
1841 struct nfs4_threshold *t = ctx->mdsthreshold;
1842 struct nfs_inode *nfsi = NFS_I(ino);
1843 loff_t fsize = i_size_read(ino);
1844 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1845
1846 if (t == NULL)
1847 return ret;
1848
1849 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1850 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1851
1852 switch (iomode) {
1853 case IOMODE_READ:
1854 if (t->bm & THRESHOLD_RD) {
1855 dprintk("%s fsize %llu\n", __func__, fsize);
1856 size_set = true;
1857 if (fsize < t->rd_sz)
1858 size = true;
1859 }
1860 if (t->bm & THRESHOLD_RD_IO) {
1861 dprintk("%s nfsi->read_io %llu\n", __func__,
1862 nfsi->read_io);
1863 io_set = true;
1864 if (nfsi->read_io < t->rd_io_sz)
1865 io = true;
1866 }
1867 break;
1868 case IOMODE_RW:
1869 if (t->bm & THRESHOLD_WR) {
1870 dprintk("%s fsize %llu\n", __func__, fsize);
1871 size_set = true;
1872 if (fsize < t->wr_sz)
1873 size = true;
1874 }
1875 if (t->bm & THRESHOLD_WR_IO) {
1876 dprintk("%s nfsi->write_io %llu\n", __func__,
1877 nfsi->write_io);
1878 io_set = true;
1879 if (nfsi->write_io < t->wr_io_sz)
1880 io = true;
1881 }
1882 break;
1883 }
1884 if (size_set && io_set) {
1885 if (size && io)
1886 ret = true;
1887 } else if (size || io)
1888 ret = true;
1889
1890 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1891 return ret;
1892}
1893
1894static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1895{
1896 /*
1897 * send layoutcommit as it can hold up layoutreturn due to lseg
1898 * reference
1899 */
1900 pnfs_layoutcommit_inode(lo->plh_inode, false);
1901 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1902 nfs_wait_bit_killable,
1903 TASK_KILLABLE);
1904}
1905
1906static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1907{
1908 atomic_inc(&lo->plh_outstanding);
1909}
1910
1911static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1912{
1913 if (atomic_dec_and_test(&lo->plh_outstanding))
1914 wake_up_var(&lo->plh_outstanding);
1915}
1916
1917static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo)
1918{
1919 return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags);
1920}
1921
1922static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1923{
1924 unsigned long *bitlock = &lo->plh_flags;
1925
1926 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1927 smp_mb__after_atomic();
1928 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1929}
1930
1931static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1932 struct nfs_server *server)
1933{
1934 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
1935 struct nfs_client *clp = server->nfs_client;
1936
1937 /* The lo must be on the clp list if there is any
1938 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1939 */
1940 spin_lock(&clp->cl_lock);
1941 list_add_tail_rcu(&lo->plh_layouts, &server->layouts);
1942 spin_unlock(&clp->cl_lock);
1943 }
1944}
1945
1946/*
1947 * Layout segment is retreived from the server if not cached.
1948 * The appropriate layout segment is referenced and returned to the caller.
1949 */
1950struct pnfs_layout_segment *
1951pnfs_update_layout(struct inode *ino,
1952 struct nfs_open_context *ctx,
1953 loff_t pos,
1954 u64 count,
1955 enum pnfs_iomode iomode,
1956 bool strict_iomode,
1957 gfp_t gfp_flags)
1958{
1959 struct pnfs_layout_range arg = {
1960 .iomode = iomode,
1961 .offset = pos,
1962 .length = count,
1963 };
1964 unsigned pg_offset;
1965 struct nfs_server *server = NFS_SERVER(ino);
1966 struct nfs_client *clp = server->nfs_client;
1967 struct pnfs_layout_hdr *lo = NULL;
1968 struct pnfs_layout_segment *lseg = NULL;
1969 struct nfs4_layoutget *lgp;
1970 nfs4_stateid stateid;
1971 long timeout = 0;
1972 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1973 bool first;
1974
1975 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1976 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1977 PNFS_UPDATE_LAYOUT_NO_PNFS);
1978 goto out;
1979 }
1980
1981 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1982 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1983 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1984 goto out;
1985 }
1986
1987lookup_again:
1988 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1989 if (IS_ERR(lseg))
1990 goto out;
1991 first = false;
1992 spin_lock(&ino->i_lock);
1993 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1994 if (lo == NULL) {
1995 spin_unlock(&ino->i_lock);
1996 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1997 PNFS_UPDATE_LAYOUT_NOMEM);
1998 goto out;
1999 }
2000
2001 /* Do we even need to bother with this? */
2002 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
2003 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2004 PNFS_UPDATE_LAYOUT_BULK_RECALL);
2005 dprintk("%s matches recall, use MDS\n", __func__);
2006 goto out_unlock;
2007 }
2008
2009 /* if LAYOUTGET already failed once we don't try again */
2010 if (pnfs_layout_io_test_failed(lo, iomode)) {
2011 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2012 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
2013 goto out_unlock;
2014 }
2015
2016 /*
2017 * If the layout segment list is empty, but there are outstanding
2018 * layoutget calls, then they might be subject to a layoutrecall.
2019 */
2020 if ((list_empty(&lo->plh_segs) || !pnfs_layout_is_valid(lo)) &&
2021 atomic_read(&lo->plh_outstanding) != 0) {
2022 spin_unlock(&ino->i_lock);
2023 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
2024 !atomic_read(&lo->plh_outstanding)));
2025 if (IS_ERR(lseg))
2026 goto out_put_layout_hdr;
2027 pnfs_put_layout_hdr(lo);
2028 goto lookup_again;
2029 }
2030
2031 /*
2032 * Because we free lsegs when sending LAYOUTRETURN, we need to wait
2033 * for LAYOUTRETURN.
2034 */
2035 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2036 spin_unlock(&ino->i_lock);
2037 dprintk("%s wait for layoutreturn\n", __func__);
2038 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2039 if (!IS_ERR(lseg)) {
2040 pnfs_put_layout_hdr(lo);
2041 dprintk("%s retrying\n", __func__);
2042 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2043 lseg,
2044 PNFS_UPDATE_LAYOUT_RETRY);
2045 goto lookup_again;
2046 }
2047 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2048 PNFS_UPDATE_LAYOUT_RETURN);
2049 goto out_put_layout_hdr;
2050 }
2051
2052 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
2053 if (lseg) {
2054 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2055 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
2056 goto out_unlock;
2057 }
2058
2059 /*
2060 * Choose a stateid for the LAYOUTGET. If we don't have a layout
2061 * stateid, or it has been invalidated, then we must use the open
2062 * stateid.
2063 */
2064 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
2065 int status;
2066
2067 /*
2068 * The first layoutget for the file. Need to serialize per
2069 * RFC 5661 Errata 3208.
2070 */
2071 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
2072 &lo->plh_flags)) {
2073 spin_unlock(&ino->i_lock);
2074 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
2075 NFS_LAYOUT_FIRST_LAYOUTGET,
2076 TASK_KILLABLE));
2077 if (IS_ERR(lseg))
2078 goto out_put_layout_hdr;
2079 pnfs_put_layout_hdr(lo);
2080 dprintk("%s retrying\n", __func__);
2081 goto lookup_again;
2082 }
2083
2084 spin_unlock(&ino->i_lock);
2085 first = true;
2086 status = nfs4_select_rw_stateid(ctx->state,
2087 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
2088 NULL, &stateid, NULL);
2089 if (status != 0) {
2090 lseg = ERR_PTR(status);
2091 trace_pnfs_update_layout(ino, pos, count,
2092 iomode, lo, lseg,
2093 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2094 nfs4_schedule_stateid_recovery(server, ctx->state);
2095 pnfs_clear_first_layoutget(lo);
2096 pnfs_put_layout_hdr(lo);
2097 goto lookup_again;
2098 }
2099 spin_lock(&ino->i_lock);
2100 } else {
2101 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2102 }
2103
2104 if (pnfs_layoutgets_blocked(lo)) {
2105 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2106 PNFS_UPDATE_LAYOUT_BLOCKED);
2107 goto out_unlock;
2108 }
2109 nfs_layoutget_begin(lo);
2110 spin_unlock(&ino->i_lock);
2111
2112 _add_to_server_list(lo, server);
2113
2114 pg_offset = arg.offset & ~PAGE_MASK;
2115 if (pg_offset) {
2116 arg.offset -= pg_offset;
2117 arg.length += pg_offset;
2118 }
2119 if (arg.length != NFS4_MAX_UINT64)
2120 arg.length = PAGE_ALIGN(arg.length);
2121
2122 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2123 if (!lgp) {
2124 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2125 PNFS_UPDATE_LAYOUT_NOMEM);
2126 nfs_layoutget_end(lo);
2127 goto out_put_layout_hdr;
2128 }
2129
2130 lgp->lo = lo;
2131 pnfs_get_layout_hdr(lo);
2132
2133 lseg = nfs4_proc_layoutget(lgp, &timeout);
2134 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2135 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2136 nfs_layoutget_end(lo);
2137 if (IS_ERR(lseg)) {
2138 switch(PTR_ERR(lseg)) {
2139 case -EBUSY:
2140 if (time_after(jiffies, giveup))
2141 lseg = NULL;
2142 break;
2143 case -ERECALLCONFLICT:
2144 case -EAGAIN:
2145 break;
2146 default:
2147 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2148 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2149 lseg = NULL;
2150 }
2151 goto out_put_layout_hdr;
2152 }
2153 if (lseg) {
2154 if (first)
2155 pnfs_clear_first_layoutget(lo);
2156 trace_pnfs_update_layout(ino, pos, count,
2157 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2158 pnfs_put_layout_hdr(lo);
2159 goto lookup_again;
2160 }
2161 } else {
2162 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2163 }
2164
2165out_put_layout_hdr:
2166 if (first)
2167 pnfs_clear_first_layoutget(lo);
2168 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2169 PNFS_UPDATE_LAYOUT_EXIT);
2170 pnfs_put_layout_hdr(lo);
2171out:
2172 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2173 "(%s, offset: %llu, length: %llu)\n",
2174 __func__, ino->i_sb->s_id,
2175 (unsigned long long)NFS_FILEID(ino),
2176 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2177 iomode==IOMODE_RW ? "read/write" : "read-only",
2178 (unsigned long long)pos,
2179 (unsigned long long)count);
2180 return lseg;
2181out_unlock:
2182 spin_unlock(&ino->i_lock);
2183 goto out_put_layout_hdr;
2184}
2185EXPORT_SYMBOL_GPL(pnfs_update_layout);
2186
2187static bool
2188pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2189{
2190 switch (range->iomode) {
2191 case IOMODE_READ:
2192 case IOMODE_RW:
2193 break;
2194 default:
2195 return false;
2196 }
2197 if (range->offset == NFS4_MAX_UINT64)
2198 return false;
2199 if (range->length == 0)
2200 return false;
2201 if (range->length != NFS4_MAX_UINT64 &&
2202 range->length > NFS4_MAX_UINT64 - range->offset)
2203 return false;
2204 return true;
2205}
2206
2207static struct pnfs_layout_hdr *
2208_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2209{
2210 struct pnfs_layout_hdr *lo;
2211
2212 spin_lock(&ino->i_lock);
2213 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2214 if (!lo)
2215 goto out_unlock;
2216 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2217 goto out_unlock;
2218 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2219 goto out_unlock;
2220 if (pnfs_layoutgets_blocked(lo))
2221 goto out_unlock;
2222 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2223 goto out_unlock;
2224 nfs_layoutget_begin(lo);
2225 spin_unlock(&ino->i_lock);
2226 _add_to_server_list(lo, NFS_SERVER(ino));
2227 return lo;
2228
2229out_unlock:
2230 spin_unlock(&ino->i_lock);
2231 pnfs_put_layout_hdr(lo);
2232 return NULL;
2233}
2234
2235static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2236 struct nfs_open_context *ctx)
2237{
2238 struct inode *ino = data->dentry->d_inode;
2239 struct pnfs_layout_range rng = {
2240 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2241 IOMODE_RW: IOMODE_READ,
2242 .offset = 0,
2243 .length = NFS4_MAX_UINT64,
2244 };
2245 struct nfs4_layoutget *lgp;
2246 struct pnfs_layout_hdr *lo;
2247
2248 /* Heuristic: don't send layoutget if we have cached data */
2249 if (rng.iomode == IOMODE_READ &&
2250 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2251 return;
2252
2253 lo = _pnfs_grab_empty_layout(ino, ctx);
2254 if (!lo)
2255 return;
2256 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid,
2257 &rng, GFP_KERNEL);
2258 if (!lgp) {
2259 pnfs_clear_first_layoutget(lo);
2260 nfs_layoutget_end(lo);
2261 pnfs_put_layout_hdr(lo);
2262 return;
2263 }
2264 lgp->lo = lo;
2265 data->lgp = lgp;
2266 data->o_arg.lg_args = &lgp->args;
2267 data->o_res.lg_res = &lgp->res;
2268}
2269
2270static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2271 struct nfs_open_context *ctx)
2272{
2273 struct inode *ino = data->dentry->d_inode;
2274 struct pnfs_layout_range rng = {
2275 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2276 IOMODE_RW: IOMODE_READ,
2277 .offset = 0,
2278 .length = NFS4_MAX_UINT64,
2279 };
2280 struct nfs4_layoutget *lgp;
2281
2282 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid,
2283 &rng, GFP_KERNEL);
2284 if (!lgp)
2285 return;
2286 data->lgp = lgp;
2287 data->o_arg.lg_args = &lgp->args;
2288 data->o_res.lg_res = &lgp->res;
2289}
2290
2291void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2292 struct nfs_open_context *ctx)
2293{
2294 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2295
2296 if (!(pnfs_enabled_sb(server) &&
2297 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2298 return;
2299 /* Could check on max_ops, but currently hardcoded high enough */
2300 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2301 return;
2302 if (data->lgp)
2303 return;
2304 if (data->state)
2305 _lgopen_prepare_attached(data, ctx);
2306 else
2307 _lgopen_prepare_floating(data, ctx);
2308}
2309
2310void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2311 struct nfs_open_context *ctx)
2312{
2313 struct pnfs_layout_hdr *lo;
2314 struct pnfs_layout_segment *lseg;
2315 struct nfs_server *srv = NFS_SERVER(ino);
2316 u32 iomode;
2317
2318 if (!lgp)
2319 return;
2320 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2321 if (lgp->res.status) {
2322 switch (lgp->res.status) {
2323 default:
2324 break;
2325 /*
2326 * Halt lgopen attempts if the server doesn't recognise
2327 * the "current stateid" value, the layout type, or the
2328 * layoutget operation as being valid.
2329 * Also if it complains about too many ops in the compound
2330 * or of the request/reply being too big.
2331 */
2332 case -NFS4ERR_BAD_STATEID:
2333 case -NFS4ERR_NOTSUPP:
2334 case -NFS4ERR_REP_TOO_BIG:
2335 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2336 case -NFS4ERR_REQ_TOO_BIG:
2337 case -NFS4ERR_TOO_MANY_OPS:
2338 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2339 srv->caps &= ~NFS_CAP_LGOPEN;
2340 }
2341 return;
2342 }
2343 if (!lgp->lo) {
2344 lo = _pnfs_grab_empty_layout(ino, ctx);
2345 if (!lo)
2346 return;
2347 lgp->lo = lo;
2348 } else
2349 lo = lgp->lo;
2350
2351 lseg = pnfs_layout_process(lgp);
2352 if (!IS_ERR(lseg)) {
2353 iomode = lgp->args.range.iomode;
2354 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2355 pnfs_put_lseg(lseg);
2356 }
2357}
2358
2359void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2360{
2361 if (lgp != NULL) {
2362 if (lgp->lo) {
2363 pnfs_clear_first_layoutget(lgp->lo);
2364 nfs_layoutget_end(lgp->lo);
2365 }
2366 pnfs_layoutget_free(lgp);
2367 }
2368}
2369
2370struct pnfs_layout_segment *
2371pnfs_layout_process(struct nfs4_layoutget *lgp)
2372{
2373 struct pnfs_layout_hdr *lo = lgp->lo;
2374 struct nfs4_layoutget_res *res = &lgp->res;
2375 struct pnfs_layout_segment *lseg;
2376 struct inode *ino = lo->plh_inode;
2377 LIST_HEAD(free_me);
2378
2379 if (!pnfs_sanity_check_layout_range(&res->range))
2380 return ERR_PTR(-EINVAL);
2381
2382 /* Inject layout blob into I/O device driver */
2383 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2384 if (IS_ERR_OR_NULL(lseg)) {
2385 if (!lseg)
2386 lseg = ERR_PTR(-ENOMEM);
2387
2388 dprintk("%s: Could not allocate layout: error %ld\n",
2389 __func__, PTR_ERR(lseg));
2390 return lseg;
2391 }
2392
2393 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2394
2395 spin_lock(&ino->i_lock);
2396 if (pnfs_layoutgets_blocked(lo)) {
2397 dprintk("%s forget reply due to state\n", __func__);
2398 goto out_forget;
2399 }
2400
2401 if (!pnfs_layout_is_valid(lo) && !pnfs_is_first_layoutget(lo))
2402 goto out_forget;
2403
2404 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2405 /* existing state ID, make sure the sequence number matches. */
2406 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2407 if (!pnfs_layout_is_valid(lo))
2408 lo->plh_barrier = 0;
2409 dprintk("%s forget reply due to sequence\n", __func__);
2410 goto out_forget;
2411 }
2412 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false);
2413 } else if (pnfs_layout_is_valid(lo)) {
2414 /*
2415 * We got an entirely new state ID. Mark all segments for the
2416 * inode invalid, and retry the layoutget
2417 */
2418 struct pnfs_layout_range range = {
2419 .iomode = IOMODE_ANY,
2420 .length = NFS4_MAX_UINT64,
2421 };
2422 pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0);
2423 goto out_forget;
2424 } else {
2425 /* We have a completely new layout */
2426 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
2427 }
2428
2429 pnfs_get_lseg(lseg);
2430 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2431
2432
2433 if (res->return_on_close)
2434 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2435
2436 spin_unlock(&ino->i_lock);
2437 pnfs_free_lseg_list(&free_me);
2438 return lseg;
2439
2440out_forget:
2441 spin_unlock(&ino->i_lock);
2442 lseg->pls_layout = lo;
2443 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2444 return ERR_PTR(-EAGAIN);
2445}
2446
2447/**
2448 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2449 * @lo: pointer to layout header
2450 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2451 * @return_range: describe layout segment ranges to be returned
2452 * @seq: stateid seqid to match
2453 *
2454 * This function is mainly intended for use by layoutrecall. It attempts
2455 * to free the layout segment immediately, or else to mark it for return
2456 * as soon as its reference count drops to zero.
2457 *
2458 * Returns
2459 * - 0: a layoutreturn needs to be scheduled.
2460 * - EBUSY: there are layout segment that are still in use.
2461 * - ENOENT: there are no layout segments that need to be returned.
2462 */
2463int
2464pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2465 struct list_head *tmp_list,
2466 const struct pnfs_layout_range *return_range,
2467 u32 seq)
2468{
2469 struct pnfs_layout_segment *lseg, *next;
2470 int remaining = 0;
2471
2472 dprintk("%s:Begin lo %p\n", __func__, lo);
2473
2474 assert_spin_locked(&lo->plh_inode->i_lock);
2475
2476 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2477 tmp_list = &lo->plh_return_segs;
2478
2479 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2480 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2481 dprintk("%s: marking lseg %p iomode %d "
2482 "offset %llu length %llu\n", __func__,
2483 lseg, lseg->pls_range.iomode,
2484 lseg->pls_range.offset,
2485 lseg->pls_range.length);
2486 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2487 tmp_list = &lo->plh_return_segs;
2488 if (mark_lseg_invalid(lseg, tmp_list))
2489 continue;
2490 remaining++;
2491 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2492 }
2493
2494 if (remaining) {
2495 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2496 return -EBUSY;
2497 }
2498
2499 if (!list_empty(&lo->plh_return_segs)) {
2500 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2501 return 0;
2502 }
2503
2504 return -ENOENT;
2505}
2506
2507static void
2508pnfs_mark_layout_for_return(struct inode *inode,
2509 const struct pnfs_layout_range *range)
2510{
2511 struct pnfs_layout_hdr *lo;
2512 bool return_now = false;
2513
2514 spin_lock(&inode->i_lock);
2515 lo = NFS_I(inode)->layout;
2516 if (!pnfs_layout_is_valid(lo)) {
2517 spin_unlock(&inode->i_lock);
2518 return;
2519 }
2520 pnfs_set_plh_return_info(lo, range->iomode, 0);
2521 /*
2522 * mark all matching lsegs so that we are sure to have no live
2523 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2524 * for how it works.
2525 */
2526 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) {
2527 const struct cred *cred;
2528 nfs4_stateid stateid;
2529 enum pnfs_iomode iomode;
2530
2531 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
2532 spin_unlock(&inode->i_lock);
2533 if (return_now)
2534 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
2535 } else {
2536 spin_unlock(&inode->i_lock);
2537 nfs_commit_inode(inode, 0);
2538 }
2539}
2540
2541void pnfs_error_mark_layout_for_return(struct inode *inode,
2542 struct pnfs_layout_segment *lseg)
2543{
2544 struct pnfs_layout_range range = {
2545 .iomode = lseg->pls_range.iomode,
2546 .offset = 0,
2547 .length = NFS4_MAX_UINT64,
2548 };
2549
2550 pnfs_mark_layout_for_return(inode, &range);
2551}
2552EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2553
2554static bool
2555pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo)
2556{
2557 return pnfs_layout_is_valid(lo) &&
2558 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) &&
2559 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
2560}
2561
2562static struct pnfs_layout_segment *
2563pnfs_find_first_lseg(struct pnfs_layout_hdr *lo,
2564 const struct pnfs_layout_range *range,
2565 enum pnfs_iomode iomode)
2566{
2567 struct pnfs_layout_segment *lseg;
2568
2569 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
2570 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
2571 continue;
2572 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2573 continue;
2574 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY)
2575 continue;
2576 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range))
2577 return lseg;
2578 }
2579 return NULL;
2580}
2581
2582/* Find open file states whose mode matches that of the range */
2583static bool
2584pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo,
2585 const struct pnfs_layout_range *range)
2586{
2587 struct list_head *head;
2588 struct nfs_open_context *ctx;
2589 fmode_t mode = 0;
2590
2591 if (!pnfs_layout_can_be_returned(lo) ||
2592 !pnfs_find_first_lseg(lo, range, range->iomode))
2593 return false;
2594
2595 head = &NFS_I(lo->plh_inode)->open_files;
2596 list_for_each_entry_rcu(ctx, head, list) {
2597 if (ctx->state)
2598 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE);
2599 }
2600
2601 switch (range->iomode) {
2602 default:
2603 break;
2604 case IOMODE_READ:
2605 mode &= ~FMODE_WRITE;
2606 break;
2607 case IOMODE_RW:
2608 if (pnfs_find_first_lseg(lo, range, IOMODE_READ))
2609 mode &= ~FMODE_READ;
2610 }
2611 return mode == 0;
2612}
2613
2614static int
2615pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data)
2616{
2617 const struct pnfs_layout_range *range = data;
2618 struct pnfs_layout_hdr *lo;
2619 struct inode *inode;
2620restart:
2621 rcu_read_lock();
2622 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
2623 if (!pnfs_layout_can_be_returned(lo) ||
2624 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2625 continue;
2626 inode = lo->plh_inode;
2627 spin_lock(&inode->i_lock);
2628 if (!pnfs_should_return_unused_layout(lo, range)) {
2629 spin_unlock(&inode->i_lock);
2630 continue;
2631 }
2632 spin_unlock(&inode->i_lock);
2633 inode = pnfs_grab_inode_layout_hdr(lo);
2634 if (!inode)
2635 continue;
2636 rcu_read_unlock();
2637 pnfs_mark_layout_for_return(inode, range);
2638 iput(inode);
2639 cond_resched();
2640 goto restart;
2641 }
2642 rcu_read_unlock();
2643 return 0;
2644}
2645
2646void
2647pnfs_layout_return_unused_byclid(struct nfs_client *clp,
2648 enum pnfs_iomode iomode)
2649{
2650 struct pnfs_layout_range range = {
2651 .iomode = iomode,
2652 .offset = 0,
2653 .length = NFS4_MAX_UINT64,
2654 };
2655
2656 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver,
2657 &range);
2658}
2659
2660void
2661pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2662{
2663 if (pgio->pg_lseg == NULL ||
2664 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2665 return;
2666 pnfs_put_lseg(pgio->pg_lseg);
2667 pgio->pg_lseg = NULL;
2668}
2669EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2670
2671/*
2672 * Check for any intersection between the request and the pgio->pg_lseg,
2673 * and if none, put this pgio->pg_lseg away.
2674 */
2675void
2676pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2677{
2678 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2679 pnfs_put_lseg(pgio->pg_lseg);
2680 pgio->pg_lseg = NULL;
2681 }
2682}
2683EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range);
2684
2685void
2686pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2687{
2688 u64 rd_size;
2689
2690 pnfs_generic_pg_check_layout(pgio);
2691 pnfs_generic_pg_check_range(pgio, req);
2692 if (pgio->pg_lseg == NULL) {
2693 if (pgio->pg_dreq == NULL)
2694 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2695 else
2696 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2697
2698 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2699 nfs_req_openctx(req),
2700 req_offset(req),
2701 rd_size,
2702 IOMODE_READ,
2703 false,
2704 GFP_KERNEL);
2705 if (IS_ERR(pgio->pg_lseg)) {
2706 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2707 pgio->pg_lseg = NULL;
2708 return;
2709 }
2710 }
2711 /* If no lseg, fall back to read through mds */
2712 if (pgio->pg_lseg == NULL)
2713 nfs_pageio_reset_read_mds(pgio);
2714
2715}
2716EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2717
2718void
2719pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2720 struct nfs_page *req, u64 wb_size)
2721{
2722 pnfs_generic_pg_check_layout(pgio);
2723 pnfs_generic_pg_check_range(pgio, req);
2724 if (pgio->pg_lseg == NULL) {
2725 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2726 nfs_req_openctx(req),
2727 req_offset(req),
2728 wb_size,
2729 IOMODE_RW,
2730 false,
2731 GFP_KERNEL);
2732 if (IS_ERR(pgio->pg_lseg)) {
2733 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2734 pgio->pg_lseg = NULL;
2735 return;
2736 }
2737 }
2738 /* If no lseg, fall back to write through mds */
2739 if (pgio->pg_lseg == NULL)
2740 nfs_pageio_reset_write_mds(pgio);
2741}
2742EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2743
2744void
2745pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2746{
2747 if (desc->pg_lseg) {
2748 pnfs_put_lseg(desc->pg_lseg);
2749 desc->pg_lseg = NULL;
2750 }
2751}
2752EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2753
2754/*
2755 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2756 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2757 */
2758size_t
2759pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2760 struct nfs_page *prev, struct nfs_page *req)
2761{
2762 unsigned int size;
2763 u64 seg_end, req_start, seg_left;
2764
2765 size = nfs_generic_pg_test(pgio, prev, req);
2766 if (!size)
2767 return 0;
2768
2769 /*
2770 * 'size' contains the number of bytes left in the current page (up
2771 * to the original size asked for in @req->wb_bytes).
2772 *
2773 * Calculate how many bytes are left in the layout segment
2774 * and if there are less bytes than 'size', return that instead.
2775 *
2776 * Please also note that 'end_offset' is actually the offset of the
2777 * first byte that lies outside the pnfs_layout_range. FIXME?
2778 *
2779 */
2780 if (pgio->pg_lseg) {
2781 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2782 pgio->pg_lseg->pls_range.length);
2783 req_start = req_offset(req);
2784
2785 /* start of request is past the last byte of this segment */
2786 if (req_start >= seg_end)
2787 return 0;
2788
2789 /* adjust 'size' iff there are fewer bytes left in the
2790 * segment than what nfs_generic_pg_test returned */
2791 seg_left = seg_end - req_start;
2792 if (seg_left < size)
2793 size = (unsigned int)seg_left;
2794 }
2795
2796 return size;
2797}
2798EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2799
2800int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2801{
2802 struct nfs_pageio_descriptor pgio;
2803
2804 /* Resend all requests through the MDS */
2805 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2806 hdr->completion_ops);
2807 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2808 return nfs_pageio_resend(&pgio, hdr);
2809}
2810EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2811
2812static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2813{
2814
2815 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2816 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2817 PNFS_LAYOUTRET_ON_ERROR) {
2818 pnfs_return_layout(hdr->inode);
2819 }
2820 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2821 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2822}
2823
2824/*
2825 * Called by non rpc-based layout drivers
2826 */
2827void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2828{
2829 if (likely(!hdr->pnfs_error)) {
2830 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2831 hdr->mds_offset + hdr->res.count);
2832 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2833 }
2834 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2835 if (unlikely(hdr->pnfs_error))
2836 pnfs_ld_handle_write_error(hdr);
2837 hdr->mds_ops->rpc_release(hdr);
2838}
2839EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2840
2841static void
2842pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2843 struct nfs_pgio_header *hdr)
2844{
2845 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2846
2847 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2848 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2849 nfs_pageio_reset_write_mds(desc);
2850 mirror->pg_recoalesce = 1;
2851 }
2852 hdr->completion_ops->completion(hdr);
2853}
2854
2855static enum pnfs_try_status
2856pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2857 const struct rpc_call_ops *call_ops,
2858 struct pnfs_layout_segment *lseg,
2859 int how)
2860{
2861 struct inode *inode = hdr->inode;
2862 enum pnfs_try_status trypnfs;
2863 struct nfs_server *nfss = NFS_SERVER(inode);
2864
2865 hdr->mds_ops = call_ops;
2866
2867 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2868 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2869 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2870 if (trypnfs != PNFS_NOT_ATTEMPTED)
2871 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2872 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2873 return trypnfs;
2874}
2875
2876static void
2877pnfs_do_write(struct nfs_pageio_descriptor *desc,
2878 struct nfs_pgio_header *hdr, int how)
2879{
2880 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2881 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2882 enum pnfs_try_status trypnfs;
2883
2884 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2885 switch (trypnfs) {
2886 case PNFS_NOT_ATTEMPTED:
2887 pnfs_write_through_mds(desc, hdr);
2888 break;
2889 case PNFS_ATTEMPTED:
2890 break;
2891 case PNFS_TRY_AGAIN:
2892 /* cleanup hdr and prepare to redo pnfs */
2893 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2894 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2895 list_splice_init(&hdr->pages, &mirror->pg_list);
2896 mirror->pg_recoalesce = 1;
2897 }
2898 hdr->mds_ops->rpc_release(hdr);
2899 }
2900}
2901
2902static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2903{
2904 pnfs_put_lseg(hdr->lseg);
2905 nfs_pgio_header_free(hdr);
2906}
2907
2908int
2909pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2910{
2911 struct nfs_pgio_header *hdr;
2912 int ret;
2913
2914 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2915 if (!hdr) {
2916 desc->pg_error = -ENOMEM;
2917 return desc->pg_error;
2918 }
2919 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2920
2921 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2922 ret = nfs_generic_pgio(desc, hdr);
2923 if (!ret)
2924 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2925
2926 return ret;
2927}
2928EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2929
2930int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2931{
2932 struct nfs_pageio_descriptor pgio;
2933
2934 /* Resend all requests through the MDS */
2935 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2936 return nfs_pageio_resend(&pgio, hdr);
2937}
2938EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2939
2940static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2941{
2942 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2943 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2944 PNFS_LAYOUTRET_ON_ERROR) {
2945 pnfs_return_layout(hdr->inode);
2946 }
2947 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2948 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2949}
2950
2951/*
2952 * Called by non rpc-based layout drivers
2953 */
2954void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2955{
2956 if (likely(!hdr->pnfs_error))
2957 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2958 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2959 if (unlikely(hdr->pnfs_error))
2960 pnfs_ld_handle_read_error(hdr);
2961 hdr->mds_ops->rpc_release(hdr);
2962}
2963EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2964
2965static void
2966pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2967 struct nfs_pgio_header *hdr)
2968{
2969 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2970
2971 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2972 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2973 nfs_pageio_reset_read_mds(desc);
2974 mirror->pg_recoalesce = 1;
2975 }
2976 hdr->completion_ops->completion(hdr);
2977}
2978
2979/*
2980 * Call the appropriate parallel I/O subsystem read function.
2981 */
2982static enum pnfs_try_status
2983pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2984 const struct rpc_call_ops *call_ops,
2985 struct pnfs_layout_segment *lseg)
2986{
2987 struct inode *inode = hdr->inode;
2988 struct nfs_server *nfss = NFS_SERVER(inode);
2989 enum pnfs_try_status trypnfs;
2990
2991 hdr->mds_ops = call_ops;
2992
2993 dprintk("%s: Reading ino:%lu %u@%llu\n",
2994 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2995
2996 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2997 if (trypnfs != PNFS_NOT_ATTEMPTED)
2998 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2999 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
3000 return trypnfs;
3001}
3002
3003/* Resend all requests through pnfs. */
3004void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr,
3005 unsigned int mirror_idx)
3006{
3007 struct nfs_pageio_descriptor pgio;
3008
3009 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3010 /* Prevent deadlocks with layoutreturn! */
3011 pnfs_put_lseg(hdr->lseg);
3012 hdr->lseg = NULL;
3013
3014 nfs_pageio_init_read(&pgio, hdr->inode, false,
3015 hdr->completion_ops);
3016 pgio.pg_mirror_idx = mirror_idx;
3017 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
3018 }
3019}
3020EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
3021
3022static void
3023pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
3024{
3025 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
3026 struct pnfs_layout_segment *lseg = desc->pg_lseg;
3027 enum pnfs_try_status trypnfs;
3028
3029 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
3030 switch (trypnfs) {
3031 case PNFS_NOT_ATTEMPTED:
3032 pnfs_read_through_mds(desc, hdr);
3033 break;
3034 case PNFS_ATTEMPTED:
3035 break;
3036 case PNFS_TRY_AGAIN:
3037 /* cleanup hdr and prepare to redo pnfs */
3038 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3039 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
3040 list_splice_init(&hdr->pages, &mirror->pg_list);
3041 mirror->pg_recoalesce = 1;
3042 }
3043 hdr->mds_ops->rpc_release(hdr);
3044 }
3045}
3046
3047static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
3048{
3049 pnfs_put_lseg(hdr->lseg);
3050 nfs_pgio_header_free(hdr);
3051}
3052
3053int
3054pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
3055{
3056 struct nfs_pgio_header *hdr;
3057 int ret;
3058
3059 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
3060 if (!hdr) {
3061 desc->pg_error = -ENOMEM;
3062 return desc->pg_error;
3063 }
3064 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
3065 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
3066 ret = nfs_generic_pgio(desc, hdr);
3067 if (!ret)
3068 pnfs_do_read(desc, hdr);
3069 return ret;
3070}
3071EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
3072
3073static void pnfs_clear_layoutcommitting(struct inode *inode)
3074{
3075 unsigned long *bitlock = &NFS_I(inode)->flags;
3076
3077 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
3078 smp_mb__after_atomic();
3079 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
3080}
3081
3082/*
3083 * There can be multiple RW segments.
3084 */
3085static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
3086{
3087 struct pnfs_layout_segment *lseg;
3088
3089 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
3090 if (lseg->pls_range.iomode == IOMODE_RW &&
3091 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
3092 list_add(&lseg->pls_lc_list, listp);
3093 }
3094}
3095
3096static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
3097{
3098 struct pnfs_layout_segment *lseg, *tmp;
3099
3100 /* Matched by references in pnfs_set_layoutcommit */
3101 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
3102 list_del_init(&lseg->pls_lc_list);
3103 pnfs_put_lseg(lseg);
3104 }
3105
3106 pnfs_clear_layoutcommitting(inode);
3107}
3108
3109void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
3110{
3111 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
3112}
3113EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
3114
3115void
3116pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
3117 loff_t end_pos)
3118{
3119 struct nfs_inode *nfsi = NFS_I(inode);
3120 bool mark_as_dirty = false;
3121
3122 spin_lock(&inode->i_lock);
3123 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
3124 nfsi->layout->plh_lwb = end_pos;
3125 mark_as_dirty = true;
3126 dprintk("%s: Set layoutcommit for inode %lu ",
3127 __func__, inode->i_ino);
3128 } else if (end_pos > nfsi->layout->plh_lwb)
3129 nfsi->layout->plh_lwb = end_pos;
3130 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
3131 /* references matched in nfs4_layoutcommit_release */
3132 pnfs_get_lseg(lseg);
3133 }
3134 spin_unlock(&inode->i_lock);
3135 dprintk("%s: lseg %p end_pos %llu\n",
3136 __func__, lseg, nfsi->layout->plh_lwb);
3137
3138 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
3139 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
3140 if (mark_as_dirty)
3141 mark_inode_dirty_sync(inode);
3142}
3143EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
3144
3145void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
3146{
3147 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
3148
3149 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
3150 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
3151 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
3152}
3153
3154/*
3155 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3156 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
3157 * data to disk to allow the server to recover the data if it crashes.
3158 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
3159 * is off, and a COMMIT is sent to a data server, or
3160 * if WRITEs to a data server return NFS_DATA_SYNC.
3161 */
3162int
3163pnfs_layoutcommit_inode(struct inode *inode, bool sync)
3164{
3165 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3166 struct nfs4_layoutcommit_data *data;
3167 struct nfs_inode *nfsi = NFS_I(inode);
3168 loff_t end_pos;
3169 int status;
3170
3171 if (!pnfs_layoutcommit_outstanding(inode))
3172 return 0;
3173
3174 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
3175
3176 status = -EAGAIN;
3177 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
3178 if (!sync)
3179 goto out;
3180 status = wait_on_bit_lock_action(&nfsi->flags,
3181 NFS_INO_LAYOUTCOMMITTING,
3182 nfs_wait_bit_killable,
3183 TASK_KILLABLE);
3184 if (status)
3185 goto out;
3186 }
3187
3188 status = -ENOMEM;
3189 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
3190 data = kzalloc(sizeof(*data), GFP_NOFS);
3191 if (!data)
3192 goto clear_layoutcommitting;
3193
3194 status = 0;
3195 spin_lock(&inode->i_lock);
3196 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
3197 goto out_unlock;
3198
3199 INIT_LIST_HEAD(&data->lseg_list);
3200 pnfs_list_write_lseg(inode, &data->lseg_list);
3201
3202 end_pos = nfsi->layout->plh_lwb;
3203
3204 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3205 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3206 spin_unlock(&inode->i_lock);
3207
3208 data->args.inode = inode;
3209 nfs_fattr_init(&data->fattr);
3210 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3211 data->res.fattr = &data->fattr;
3212 if (end_pos != 0)
3213 data->args.lastbytewritten = end_pos - 1;
3214 else
3215 data->args.lastbytewritten = U64_MAX;
3216 data->res.server = NFS_SERVER(inode);
3217
3218 if (ld->prepare_layoutcommit) {
3219 status = ld->prepare_layoutcommit(&data->args);
3220 if (status) {
3221 put_cred(data->cred);
3222 spin_lock(&inode->i_lock);
3223 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3224 if (end_pos > nfsi->layout->plh_lwb)
3225 nfsi->layout->plh_lwb = end_pos;
3226 goto out_unlock;
3227 }
3228 }
3229
3230
3231 status = nfs4_proc_layoutcommit(data, sync);
3232out:
3233 if (status)
3234 mark_inode_dirty_sync(inode);
3235 dprintk("<-- %s status %d\n", __func__, status);
3236 return status;
3237out_unlock:
3238 spin_unlock(&inode->i_lock);
3239 kfree(data);
3240clear_layoutcommitting:
3241 pnfs_clear_layoutcommitting(inode);
3242 goto out;
3243}
3244EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3245
3246int
3247pnfs_generic_sync(struct inode *inode, bool datasync)
3248{
3249 return pnfs_layoutcommit_inode(inode, true);
3250}
3251EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3252
3253struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3254{
3255 struct nfs4_threshold *thp;
3256
3257 thp = kzalloc(sizeof(*thp), GFP_NOFS);
3258 if (!thp) {
3259 dprintk("%s mdsthreshold allocation failed\n", __func__);
3260 return NULL;
3261 }
3262 return thp;
3263}
3264
3265#if IS_ENABLED(CONFIG_NFS_V4_2)
3266int
3267pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3268{
3269 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3270 struct nfs_server *server = NFS_SERVER(inode);
3271 struct nfs_inode *nfsi = NFS_I(inode);
3272 struct nfs42_layoutstat_data *data;
3273 struct pnfs_layout_hdr *hdr;
3274 int status = 0;
3275
3276 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3277 goto out;
3278
3279 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3280 goto out;
3281
3282 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3283 goto out;
3284
3285 spin_lock(&inode->i_lock);
3286 if (!NFS_I(inode)->layout) {
3287 spin_unlock(&inode->i_lock);
3288 goto out_clear_layoutstats;
3289 }
3290 hdr = NFS_I(inode)->layout;
3291 pnfs_get_layout_hdr(hdr);
3292 spin_unlock(&inode->i_lock);
3293
3294 data = kzalloc(sizeof(*data), gfp_flags);
3295 if (!data) {
3296 status = -ENOMEM;
3297 goto out_put;
3298 }
3299
3300 data->args.fh = NFS_FH(inode);
3301 data->args.inode = inode;
3302 status = ld->prepare_layoutstats(&data->args);
3303 if (status)
3304 goto out_free;
3305
3306 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3307
3308out:
3309 dprintk("%s returns %d\n", __func__, status);
3310 return status;
3311
3312out_free:
3313 kfree(data);
3314out_put:
3315 pnfs_put_layout_hdr(hdr);
3316out_clear_layoutstats:
3317 smp_mb__before_atomic();
3318 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3319 smp_mb__after_atomic();
3320 goto out;
3321}
3322EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3323#endif
3324
3325unsigned int layoutstats_timer;
3326module_param(layoutstats_timer, uint, 0644);
3327EXPORT_SYMBOL_GPL(layoutstats_timer);
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>
31#include <linux/nfs_page.h>
32#include "internal.h"
33#include "pnfs.h"
34#include "iostat.h"
35
36#define NFSDBG_FACILITY NFSDBG_PNFS
37
38/* Locking:
39 *
40 * pnfs_spinlock:
41 * protects pnfs_modules_tbl.
42 */
43static DEFINE_SPINLOCK(pnfs_spinlock);
44
45/*
46 * pnfs_modules_tbl holds all pnfs modules
47 */
48static LIST_HEAD(pnfs_modules_tbl);
49
50/* Return the registered pnfs layout driver module matching given id */
51static struct pnfs_layoutdriver_type *
52find_pnfs_driver_locked(u32 id)
53{
54 struct pnfs_layoutdriver_type *local;
55
56 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
57 if (local->id == id)
58 goto out;
59 local = NULL;
60out:
61 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
62 return local;
63}
64
65static struct pnfs_layoutdriver_type *
66find_pnfs_driver(u32 id)
67{
68 struct pnfs_layoutdriver_type *local;
69
70 spin_lock(&pnfs_spinlock);
71 local = find_pnfs_driver_locked(id);
72 spin_unlock(&pnfs_spinlock);
73 return local;
74}
75
76void
77unset_pnfs_layoutdriver(struct nfs_server *nfss)
78{
79 if (nfss->pnfs_curr_ld) {
80 if (nfss->pnfs_curr_ld->clear_layoutdriver)
81 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
82 module_put(nfss->pnfs_curr_ld->owner);
83 }
84 nfss->pnfs_curr_ld = NULL;
85}
86
87/*
88 * Try to set the server's pnfs module to the pnfs layout type specified by id.
89 * Currently only one pNFS layout driver per filesystem is supported.
90 *
91 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
92 */
93void
94set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
95 u32 id)
96{
97 struct pnfs_layoutdriver_type *ld_type = NULL;
98
99 if (id == 0)
100 goto out_no_driver;
101 if (!(server->nfs_client->cl_exchange_flags &
102 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
103 printk(KERN_ERR "%s: id %u cl_exchange_flags 0x%x\n", __func__,
104 id, server->nfs_client->cl_exchange_flags);
105 goto out_no_driver;
106 }
107 ld_type = find_pnfs_driver(id);
108 if (!ld_type) {
109 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
110 ld_type = find_pnfs_driver(id);
111 if (!ld_type) {
112 dprintk("%s: No pNFS module found for %u.\n",
113 __func__, id);
114 goto out_no_driver;
115 }
116 }
117 if (!try_module_get(ld_type->owner)) {
118 dprintk("%s: Could not grab reference on module\n", __func__);
119 goto out_no_driver;
120 }
121 server->pnfs_curr_ld = ld_type;
122 if (ld_type->set_layoutdriver
123 && ld_type->set_layoutdriver(server, mntfh)) {
124 printk(KERN_ERR "%s: Error initializing pNFS layout driver %u.\n",
125 __func__, id);
126 module_put(ld_type->owner);
127 goto out_no_driver;
128 }
129
130 dprintk("%s: pNFS module for %u set\n", __func__, id);
131 return;
132
133out_no_driver:
134 dprintk("%s: Using NFSv4 I/O\n", __func__);
135 server->pnfs_curr_ld = NULL;
136}
137
138int
139pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
140{
141 int status = -EINVAL;
142 struct pnfs_layoutdriver_type *tmp;
143
144 if (ld_type->id == 0) {
145 printk(KERN_ERR "%s id 0 is reserved\n", __func__);
146 return status;
147 }
148 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
149 printk(KERN_ERR "%s Layout driver must provide "
150 "alloc_lseg and free_lseg.\n", __func__);
151 return status;
152 }
153
154 spin_lock(&pnfs_spinlock);
155 tmp = find_pnfs_driver_locked(ld_type->id);
156 if (!tmp) {
157 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
158 status = 0;
159 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
160 ld_type->name);
161 } else {
162 printk(KERN_ERR "%s Module with id %d already loaded!\n",
163 __func__, ld_type->id);
164 }
165 spin_unlock(&pnfs_spinlock);
166
167 return status;
168}
169EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
170
171void
172pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
173{
174 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
175 spin_lock(&pnfs_spinlock);
176 list_del(&ld_type->pnfs_tblid);
177 spin_unlock(&pnfs_spinlock);
178}
179EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
180
181/*
182 * pNFS client layout cache
183 */
184
185/* Need to hold i_lock if caller does not already hold reference */
186void
187get_layout_hdr(struct pnfs_layout_hdr *lo)
188{
189 atomic_inc(&lo->plh_refcount);
190}
191
192static struct pnfs_layout_hdr *
193pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
194{
195 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
196 return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) :
197 kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags);
198}
199
200static void
201pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
202{
203 struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld;
204 put_rpccred(lo->plh_lc_cred);
205 return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo);
206}
207
208static void
209destroy_layout_hdr(struct pnfs_layout_hdr *lo)
210{
211 dprintk("%s: freeing layout cache %p\n", __func__, lo);
212 BUG_ON(!list_empty(&lo->plh_layouts));
213 NFS_I(lo->plh_inode)->layout = NULL;
214 pnfs_free_layout_hdr(lo);
215}
216
217static void
218put_layout_hdr_locked(struct pnfs_layout_hdr *lo)
219{
220 if (atomic_dec_and_test(&lo->plh_refcount))
221 destroy_layout_hdr(lo);
222}
223
224void
225put_layout_hdr(struct pnfs_layout_hdr *lo)
226{
227 struct inode *inode = lo->plh_inode;
228
229 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
230 destroy_layout_hdr(lo);
231 spin_unlock(&inode->i_lock);
232 }
233}
234
235static void
236init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
237{
238 INIT_LIST_HEAD(&lseg->pls_list);
239 INIT_LIST_HEAD(&lseg->pls_lc_list);
240 atomic_set(&lseg->pls_refcount, 1);
241 smp_mb();
242 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
243 lseg->pls_layout = lo;
244}
245
246static void free_lseg(struct pnfs_layout_segment *lseg)
247{
248 struct inode *ino = lseg->pls_layout->plh_inode;
249
250 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
251 /* Matched by get_layout_hdr in pnfs_insert_layout */
252 put_layout_hdr(NFS_I(ino)->layout);
253}
254
255static void
256put_lseg_common(struct pnfs_layout_segment *lseg)
257{
258 struct inode *inode = lseg->pls_layout->plh_inode;
259
260 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
261 list_del_init(&lseg->pls_list);
262 if (list_empty(&lseg->pls_layout->plh_segs)) {
263 set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags);
264 /* Matched by initial refcount set in alloc_init_layout_hdr */
265 put_layout_hdr_locked(lseg->pls_layout);
266 }
267 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
268}
269
270void
271put_lseg(struct pnfs_layout_segment *lseg)
272{
273 struct inode *inode;
274
275 if (!lseg)
276 return;
277
278 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
279 atomic_read(&lseg->pls_refcount),
280 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
281 inode = lseg->pls_layout->plh_inode;
282 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
283 LIST_HEAD(free_me);
284
285 put_lseg_common(lseg);
286 list_add(&lseg->pls_list, &free_me);
287 spin_unlock(&inode->i_lock);
288 pnfs_free_lseg_list(&free_me);
289 }
290}
291EXPORT_SYMBOL_GPL(put_lseg);
292
293static inline u64
294end_offset(u64 start, u64 len)
295{
296 u64 end;
297
298 end = start + len;
299 return end >= start ? end : NFS4_MAX_UINT64;
300}
301
302/* last octet in a range */
303static inline u64
304last_byte_offset(u64 start, u64 len)
305{
306 u64 end;
307
308 BUG_ON(!len);
309 end = start + len;
310 return end > start ? end - 1 : NFS4_MAX_UINT64;
311}
312
313/*
314 * is l2 fully contained in l1?
315 * start1 end1
316 * [----------------------------------)
317 * start2 end2
318 * [----------------)
319 */
320static inline int
321lo_seg_contained(struct pnfs_layout_range *l1,
322 struct pnfs_layout_range *l2)
323{
324 u64 start1 = l1->offset;
325 u64 end1 = end_offset(start1, l1->length);
326 u64 start2 = l2->offset;
327 u64 end2 = end_offset(start2, l2->length);
328
329 return (start1 <= start2) && (end1 >= end2);
330}
331
332/*
333 * is l1 and l2 intersecting?
334 * start1 end1
335 * [----------------------------------)
336 * start2 end2
337 * [----------------)
338 */
339static inline int
340lo_seg_intersecting(struct pnfs_layout_range *l1,
341 struct pnfs_layout_range *l2)
342{
343 u64 start1 = l1->offset;
344 u64 end1 = end_offset(start1, l1->length);
345 u64 start2 = l2->offset;
346 u64 end2 = end_offset(start2, l2->length);
347
348 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
349 (end2 == NFS4_MAX_UINT64 || end2 > start1);
350}
351
352static bool
353should_free_lseg(struct pnfs_layout_range *lseg_range,
354 struct pnfs_layout_range *recall_range)
355{
356 return (recall_range->iomode == IOMODE_ANY ||
357 lseg_range->iomode == recall_range->iomode) &&
358 lo_seg_intersecting(lseg_range, recall_range);
359}
360
361/* Returns 1 if lseg is removed from list, 0 otherwise */
362static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
363 struct list_head *tmp_list)
364{
365 int rv = 0;
366
367 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
368 /* Remove the reference keeping the lseg in the
369 * list. It will now be removed when all
370 * outstanding io is finished.
371 */
372 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
373 atomic_read(&lseg->pls_refcount));
374 if (atomic_dec_and_test(&lseg->pls_refcount)) {
375 put_lseg_common(lseg);
376 list_add(&lseg->pls_list, tmp_list);
377 rv = 1;
378 }
379 }
380 return rv;
381}
382
383/* Returns count of number of matching invalid lsegs remaining in list
384 * after call.
385 */
386int
387mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
388 struct list_head *tmp_list,
389 struct pnfs_layout_range *recall_range)
390{
391 struct pnfs_layout_segment *lseg, *next;
392 int invalid = 0, removed = 0;
393
394 dprintk("%s:Begin lo %p\n", __func__, lo);
395
396 if (list_empty(&lo->plh_segs)) {
397 if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags))
398 put_layout_hdr_locked(lo);
399 return 0;
400 }
401 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
402 if (!recall_range ||
403 should_free_lseg(&lseg->pls_range, recall_range)) {
404 dprintk("%s: freeing lseg %p iomode %d "
405 "offset %llu length %llu\n", __func__,
406 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
407 lseg->pls_range.length);
408 invalid++;
409 removed += mark_lseg_invalid(lseg, tmp_list);
410 }
411 dprintk("%s:Return %i\n", __func__, invalid - removed);
412 return invalid - removed;
413}
414
415/* note free_me must contain lsegs from a single layout_hdr */
416void
417pnfs_free_lseg_list(struct list_head *free_me)
418{
419 struct pnfs_layout_segment *lseg, *tmp;
420 struct pnfs_layout_hdr *lo;
421
422 if (list_empty(free_me))
423 return;
424
425 lo = list_first_entry(free_me, struct pnfs_layout_segment,
426 pls_list)->pls_layout;
427
428 if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) {
429 struct nfs_client *clp;
430
431 clp = NFS_SERVER(lo->plh_inode)->nfs_client;
432 spin_lock(&clp->cl_lock);
433 list_del_init(&lo->plh_layouts);
434 spin_unlock(&clp->cl_lock);
435 }
436 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
437 list_del(&lseg->pls_list);
438 free_lseg(lseg);
439 }
440}
441
442void
443pnfs_destroy_layout(struct nfs_inode *nfsi)
444{
445 struct pnfs_layout_hdr *lo;
446 LIST_HEAD(tmp_list);
447
448 spin_lock(&nfsi->vfs_inode.i_lock);
449 lo = nfsi->layout;
450 if (lo) {
451 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
452 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
453 }
454 spin_unlock(&nfsi->vfs_inode.i_lock);
455 pnfs_free_lseg_list(&tmp_list);
456}
457
458/*
459 * Called by the state manger to remove all layouts established under an
460 * expired lease.
461 */
462void
463pnfs_destroy_all_layouts(struct nfs_client *clp)
464{
465 struct nfs_server *server;
466 struct pnfs_layout_hdr *lo;
467 LIST_HEAD(tmp_list);
468
469 nfs4_deviceid_mark_client_invalid(clp);
470 nfs4_deviceid_purge_client(clp);
471
472 spin_lock(&clp->cl_lock);
473 rcu_read_lock();
474 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
475 if (!list_empty(&server->layouts))
476 list_splice_init(&server->layouts, &tmp_list);
477 }
478 rcu_read_unlock();
479 spin_unlock(&clp->cl_lock);
480
481 while (!list_empty(&tmp_list)) {
482 lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
483 plh_layouts);
484 dprintk("%s freeing layout for inode %lu\n", __func__,
485 lo->plh_inode->i_ino);
486 list_del_init(&lo->plh_layouts);
487 pnfs_destroy_layout(NFS_I(lo->plh_inode));
488 }
489}
490
491/* update lo->plh_stateid with new if is more recent */
492void
493pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
494 bool update_barrier)
495{
496 u32 oldseq, newseq;
497
498 oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid);
499 newseq = be32_to_cpu(new->stateid.seqid);
500 if ((int)(newseq - oldseq) > 0) {
501 memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid));
502 if (update_barrier) {
503 u32 new_barrier = be32_to_cpu(new->stateid.seqid);
504
505 if ((int)(new_barrier - lo->plh_barrier))
506 lo->plh_barrier = new_barrier;
507 } else {
508 /* Because of wraparound, we want to keep the barrier
509 * "close" to the current seqids. It needs to be
510 * within 2**31 to count as "behind", so if it
511 * gets too near that limit, give us a litle leeway
512 * and bring it to within 2**30.
513 * NOTE - and yes, this is all unsigned arithmetic.
514 */
515 if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
516 lo->plh_barrier = newseq - (1 << 30);
517 }
518 }
519}
520
521/* lget is set to 1 if called from inside send_layoutget call chain */
522static bool
523pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
524 int lget)
525{
526 if ((stateid) &&
527 (int)(lo->plh_barrier - be32_to_cpu(stateid->stateid.seqid)) >= 0)
528 return true;
529 return lo->plh_block_lgets ||
530 test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) ||
531 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
532 (list_empty(&lo->plh_segs) &&
533 (atomic_read(&lo->plh_outstanding) > lget));
534}
535
536int
537pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
538 struct nfs4_state *open_state)
539{
540 int status = 0;
541
542 dprintk("--> %s\n", __func__);
543 spin_lock(&lo->plh_inode->i_lock);
544 if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
545 status = -EAGAIN;
546 } else if (list_empty(&lo->plh_segs)) {
547 int seq;
548
549 do {
550 seq = read_seqbegin(&open_state->seqlock);
551 memcpy(dst->data, open_state->stateid.data,
552 sizeof(open_state->stateid.data));
553 } while (read_seqretry(&open_state->seqlock, seq));
554 } else
555 memcpy(dst->data, lo->plh_stateid.data, sizeof(lo->plh_stateid.data));
556 spin_unlock(&lo->plh_inode->i_lock);
557 dprintk("<-- %s\n", __func__);
558 return status;
559}
560
561/*
562* Get layout from server.
563* for now, assume that whole file layouts are requested.
564* arg->offset: 0
565* arg->length: all ones
566*/
567static struct pnfs_layout_segment *
568send_layoutget(struct pnfs_layout_hdr *lo,
569 struct nfs_open_context *ctx,
570 struct pnfs_layout_range *range,
571 gfp_t gfp_flags)
572{
573 struct inode *ino = lo->plh_inode;
574 struct nfs_server *server = NFS_SERVER(ino);
575 struct nfs4_layoutget *lgp;
576 struct pnfs_layout_segment *lseg = NULL;
577 struct page **pages = NULL;
578 int i;
579 u32 max_resp_sz, max_pages;
580
581 dprintk("--> %s\n", __func__);
582
583 BUG_ON(ctx == NULL);
584 lgp = kzalloc(sizeof(*lgp), gfp_flags);
585 if (lgp == NULL)
586 return NULL;
587
588 /* allocate pages for xdr post processing */
589 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
590 max_pages = max_resp_sz >> PAGE_SHIFT;
591
592 pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags);
593 if (!pages)
594 goto out_err_free;
595
596 for (i = 0; i < max_pages; i++) {
597 pages[i] = alloc_page(gfp_flags);
598 if (!pages[i])
599 goto out_err_free;
600 }
601
602 lgp->args.minlength = PAGE_CACHE_SIZE;
603 if (lgp->args.minlength > range->length)
604 lgp->args.minlength = range->length;
605 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
606 lgp->args.range = *range;
607 lgp->args.type = server->pnfs_curr_ld->id;
608 lgp->args.inode = ino;
609 lgp->args.ctx = get_nfs_open_context(ctx);
610 lgp->args.layout.pages = pages;
611 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
612 lgp->lsegpp = &lseg;
613 lgp->gfp_flags = gfp_flags;
614
615 /* Synchronously retrieve layout information from server and
616 * store in lseg.
617 */
618 nfs4_proc_layoutget(lgp);
619 if (!lseg) {
620 /* remember that LAYOUTGET failed and suspend trying */
621 set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
622 }
623
624 /* free xdr pages */
625 for (i = 0; i < max_pages; i++)
626 __free_page(pages[i]);
627 kfree(pages);
628
629 return lseg;
630
631out_err_free:
632 /* free any allocated xdr pages, lgp as it's not used */
633 if (pages) {
634 for (i = 0; i < max_pages; i++) {
635 if (!pages[i])
636 break;
637 __free_page(pages[i]);
638 }
639 kfree(pages);
640 }
641 kfree(lgp);
642 return NULL;
643}
644
645/* Initiates a LAYOUTRETURN(FILE) */
646int
647_pnfs_return_layout(struct inode *ino)
648{
649 struct pnfs_layout_hdr *lo = NULL;
650 struct nfs_inode *nfsi = NFS_I(ino);
651 LIST_HEAD(tmp_list);
652 struct nfs4_layoutreturn *lrp;
653 nfs4_stateid stateid;
654 int status = 0;
655
656 dprintk("--> %s\n", __func__);
657
658 spin_lock(&ino->i_lock);
659 lo = nfsi->layout;
660 if (!lo) {
661 spin_unlock(&ino->i_lock);
662 dprintk("%s: no layout to return\n", __func__);
663 return status;
664 }
665 stateid = nfsi->layout->plh_stateid;
666 /* Reference matched in nfs4_layoutreturn_release */
667 get_layout_hdr(lo);
668 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
669 lo->plh_block_lgets++;
670 spin_unlock(&ino->i_lock);
671 pnfs_free_lseg_list(&tmp_list);
672
673 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));
674
675 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
676 if (unlikely(lrp == NULL)) {
677 status = -ENOMEM;
678 set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
679 set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
680 put_layout_hdr(lo);
681 goto out;
682 }
683
684 lrp->args.stateid = stateid;
685 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
686 lrp->args.inode = ino;
687 lrp->args.layout = lo;
688 lrp->clp = NFS_SERVER(ino)->nfs_client;
689
690 status = nfs4_proc_layoutreturn(lrp);
691out:
692 dprintk("<-- %s status: %d\n", __func__, status);
693 return status;
694}
695
696bool pnfs_roc(struct inode *ino)
697{
698 struct pnfs_layout_hdr *lo;
699 struct pnfs_layout_segment *lseg, *tmp;
700 LIST_HEAD(tmp_list);
701 bool found = false;
702
703 spin_lock(&ino->i_lock);
704 lo = NFS_I(ino)->layout;
705 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
706 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
707 goto out_nolayout;
708 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
709 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
710 mark_lseg_invalid(lseg, &tmp_list);
711 found = true;
712 }
713 if (!found)
714 goto out_nolayout;
715 lo->plh_block_lgets++;
716 get_layout_hdr(lo); /* matched in pnfs_roc_release */
717 spin_unlock(&ino->i_lock);
718 pnfs_free_lseg_list(&tmp_list);
719 return true;
720
721out_nolayout:
722 spin_unlock(&ino->i_lock);
723 return false;
724}
725
726void pnfs_roc_release(struct inode *ino)
727{
728 struct pnfs_layout_hdr *lo;
729
730 spin_lock(&ino->i_lock);
731 lo = NFS_I(ino)->layout;
732 lo->plh_block_lgets--;
733 put_layout_hdr_locked(lo);
734 spin_unlock(&ino->i_lock);
735}
736
737void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
738{
739 struct pnfs_layout_hdr *lo;
740
741 spin_lock(&ino->i_lock);
742 lo = NFS_I(ino)->layout;
743 if ((int)(barrier - lo->plh_barrier) > 0)
744 lo->plh_barrier = barrier;
745 spin_unlock(&ino->i_lock);
746}
747
748bool pnfs_roc_drain(struct inode *ino, u32 *barrier)
749{
750 struct nfs_inode *nfsi = NFS_I(ino);
751 struct pnfs_layout_segment *lseg;
752 bool found = false;
753
754 spin_lock(&ino->i_lock);
755 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
756 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
757 found = true;
758 break;
759 }
760 if (!found) {
761 struct pnfs_layout_hdr *lo = nfsi->layout;
762 u32 current_seqid = be32_to_cpu(lo->plh_stateid.stateid.seqid);
763
764 /* Since close does not return a layout stateid for use as
765 * a barrier, we choose the worst-case barrier.
766 */
767 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
768 }
769 spin_unlock(&ino->i_lock);
770 return found;
771}
772
773/*
774 * Compare two layout segments for sorting into layout cache.
775 * We want to preferentially return RW over RO layouts, so ensure those
776 * are seen first.
777 */
778static s64
779cmp_layout(struct pnfs_layout_range *l1,
780 struct pnfs_layout_range *l2)
781{
782 s64 d;
783
784 /* high offset > low offset */
785 d = l1->offset - l2->offset;
786 if (d)
787 return d;
788
789 /* short length > long length */
790 d = l2->length - l1->length;
791 if (d)
792 return d;
793
794 /* read > read/write */
795 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
796}
797
798static void
799pnfs_insert_layout(struct pnfs_layout_hdr *lo,
800 struct pnfs_layout_segment *lseg)
801{
802 struct pnfs_layout_segment *lp;
803
804 dprintk("%s:Begin\n", __func__);
805
806 assert_spin_locked(&lo->plh_inode->i_lock);
807 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
808 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
809 continue;
810 list_add_tail(&lseg->pls_list, &lp->pls_list);
811 dprintk("%s: inserted lseg %p "
812 "iomode %d offset %llu length %llu before "
813 "lp %p iomode %d offset %llu length %llu\n",
814 __func__, lseg, lseg->pls_range.iomode,
815 lseg->pls_range.offset, lseg->pls_range.length,
816 lp, lp->pls_range.iomode, lp->pls_range.offset,
817 lp->pls_range.length);
818 goto out;
819 }
820 list_add_tail(&lseg->pls_list, &lo->plh_segs);
821 dprintk("%s: inserted lseg %p "
822 "iomode %d offset %llu length %llu at tail\n",
823 __func__, lseg, lseg->pls_range.iomode,
824 lseg->pls_range.offset, lseg->pls_range.length);
825out:
826 get_layout_hdr(lo);
827
828 dprintk("%s:Return\n", __func__);
829}
830
831static struct pnfs_layout_hdr *
832alloc_init_layout_hdr(struct inode *ino,
833 struct nfs_open_context *ctx,
834 gfp_t gfp_flags)
835{
836 struct pnfs_layout_hdr *lo;
837
838 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
839 if (!lo)
840 return NULL;
841 atomic_set(&lo->plh_refcount, 1);
842 INIT_LIST_HEAD(&lo->plh_layouts);
843 INIT_LIST_HEAD(&lo->plh_segs);
844 INIT_LIST_HEAD(&lo->plh_bulk_recall);
845 lo->plh_inode = ino;
846 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
847 return lo;
848}
849
850static struct pnfs_layout_hdr *
851pnfs_find_alloc_layout(struct inode *ino,
852 struct nfs_open_context *ctx,
853 gfp_t gfp_flags)
854{
855 struct nfs_inode *nfsi = NFS_I(ino);
856 struct pnfs_layout_hdr *new = NULL;
857
858 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
859
860 assert_spin_locked(&ino->i_lock);
861 if (nfsi->layout) {
862 if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
863 return NULL;
864 else
865 return nfsi->layout;
866 }
867 spin_unlock(&ino->i_lock);
868 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
869 spin_lock(&ino->i_lock);
870
871 if (likely(nfsi->layout == NULL)) /* Won the race? */
872 nfsi->layout = new;
873 else
874 pnfs_free_layout_hdr(new);
875 return nfsi->layout;
876}
877
878/*
879 * iomode matching rules:
880 * iomode lseg match
881 * ----- ----- -----
882 * ANY READ true
883 * ANY RW true
884 * RW READ false
885 * RW RW true
886 * READ READ true
887 * READ RW true
888 */
889static int
890is_matching_lseg(struct pnfs_layout_range *ls_range,
891 struct pnfs_layout_range *range)
892{
893 struct pnfs_layout_range range1;
894
895 if ((range->iomode == IOMODE_RW &&
896 ls_range->iomode != IOMODE_RW) ||
897 !lo_seg_intersecting(ls_range, range))
898 return 0;
899
900 /* range1 covers only the first byte in the range */
901 range1 = *range;
902 range1.length = 1;
903 return lo_seg_contained(ls_range, &range1);
904}
905
906/*
907 * lookup range in layout
908 */
909static struct pnfs_layout_segment *
910pnfs_find_lseg(struct pnfs_layout_hdr *lo,
911 struct pnfs_layout_range *range)
912{
913 struct pnfs_layout_segment *lseg, *ret = NULL;
914
915 dprintk("%s:Begin\n", __func__);
916
917 assert_spin_locked(&lo->plh_inode->i_lock);
918 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
919 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
920 is_matching_lseg(&lseg->pls_range, range)) {
921 ret = get_lseg(lseg);
922 break;
923 }
924 if (lseg->pls_range.offset > range->offset)
925 break;
926 }
927
928 dprintk("%s:Return lseg %p ref %d\n",
929 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
930 return ret;
931}
932
933/*
934 * Layout segment is retreived from the server if not cached.
935 * The appropriate layout segment is referenced and returned to the caller.
936 */
937struct pnfs_layout_segment *
938pnfs_update_layout(struct inode *ino,
939 struct nfs_open_context *ctx,
940 loff_t pos,
941 u64 count,
942 enum pnfs_iomode iomode,
943 gfp_t gfp_flags)
944{
945 struct pnfs_layout_range arg = {
946 .iomode = iomode,
947 .offset = pos,
948 .length = count,
949 };
950 unsigned pg_offset;
951 struct nfs_inode *nfsi = NFS_I(ino);
952 struct nfs_server *server = NFS_SERVER(ino);
953 struct nfs_client *clp = server->nfs_client;
954 struct pnfs_layout_hdr *lo;
955 struct pnfs_layout_segment *lseg = NULL;
956 bool first = false;
957
958 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
959 return NULL;
960 spin_lock(&ino->i_lock);
961 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
962 if (lo == NULL) {
963 dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__);
964 goto out_unlock;
965 }
966
967 /* Do we even need to bother with this? */
968 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
969 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
970 dprintk("%s matches recall, use MDS\n", __func__);
971 goto out_unlock;
972 }
973
974 /* if LAYOUTGET already failed once we don't try again */
975 if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags))
976 goto out_unlock;
977
978 /* Check to see if the layout for the given range already exists */
979 lseg = pnfs_find_lseg(lo, &arg);
980 if (lseg)
981 goto out_unlock;
982
983 if (pnfs_layoutgets_blocked(lo, NULL, 0))
984 goto out_unlock;
985 atomic_inc(&lo->plh_outstanding);
986
987 get_layout_hdr(lo);
988 if (list_empty(&lo->plh_segs))
989 first = true;
990 spin_unlock(&ino->i_lock);
991 if (first) {
992 /* The lo must be on the clp list if there is any
993 * chance of a CB_LAYOUTRECALL(FILE) coming in.
994 */
995 spin_lock(&clp->cl_lock);
996 BUG_ON(!list_empty(&lo->plh_layouts));
997 list_add_tail(&lo->plh_layouts, &server->layouts);
998 spin_unlock(&clp->cl_lock);
999 }
1000
1001 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1002 if (pg_offset) {
1003 arg.offset -= pg_offset;
1004 arg.length += pg_offset;
1005 }
1006 if (arg.length != NFS4_MAX_UINT64)
1007 arg.length = PAGE_CACHE_ALIGN(arg.length);
1008
1009 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1010 if (!lseg && first) {
1011 spin_lock(&clp->cl_lock);
1012 list_del_init(&lo->plh_layouts);
1013 spin_unlock(&clp->cl_lock);
1014 }
1015 atomic_dec(&lo->plh_outstanding);
1016 put_layout_hdr(lo);
1017out:
1018 dprintk("%s end, state 0x%lx lseg %p\n", __func__,
1019 nfsi->layout ? nfsi->layout->plh_flags : -1, lseg);
1020 return lseg;
1021out_unlock:
1022 spin_unlock(&ino->i_lock);
1023 goto out;
1024}
1025EXPORT_SYMBOL_GPL(pnfs_update_layout);
1026
1027int
1028pnfs_layout_process(struct nfs4_layoutget *lgp)
1029{
1030 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1031 struct nfs4_layoutget_res *res = &lgp->res;
1032 struct pnfs_layout_segment *lseg;
1033 struct inode *ino = lo->plh_inode;
1034 struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
1035 int status = 0;
1036
1037 /* Inject layout blob into I/O device driver */
1038 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1039 if (!lseg || IS_ERR(lseg)) {
1040 if (!lseg)
1041 status = -ENOMEM;
1042 else
1043 status = PTR_ERR(lseg);
1044 dprintk("%s: Could not allocate layout: error %d\n",
1045 __func__, status);
1046 goto out;
1047 }
1048
1049 spin_lock(&ino->i_lock);
1050 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
1051 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1052 dprintk("%s forget reply due to recall\n", __func__);
1053 goto out_forget_reply;
1054 }
1055
1056 if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) {
1057 dprintk("%s forget reply due to state\n", __func__);
1058 goto out_forget_reply;
1059 }
1060 init_lseg(lo, lseg);
1061 lseg->pls_range = res->range;
1062 *lgp->lsegpp = get_lseg(lseg);
1063 pnfs_insert_layout(lo, lseg);
1064
1065 if (res->return_on_close) {
1066 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1067 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1068 }
1069
1070 /* Done processing layoutget. Set the layout stateid */
1071 pnfs_set_layout_stateid(lo, &res->stateid, false);
1072 spin_unlock(&ino->i_lock);
1073out:
1074 return status;
1075
1076out_forget_reply:
1077 spin_unlock(&ino->i_lock);
1078 lseg->pls_layout = lo;
1079 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1080 goto out;
1081}
1082
1083void
1084pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1085{
1086 BUG_ON(pgio->pg_lseg != NULL);
1087
1088 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1089 req->wb_context,
1090 req_offset(req),
1091 req->wb_bytes,
1092 IOMODE_READ,
1093 GFP_KERNEL);
1094 /* If no lseg, fall back to read through mds */
1095 if (pgio->pg_lseg == NULL)
1096 nfs_pageio_reset_read_mds(pgio);
1097
1098}
1099EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1100
1101void
1102pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1103{
1104 BUG_ON(pgio->pg_lseg != NULL);
1105
1106 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1107 req->wb_context,
1108 req_offset(req),
1109 req->wb_bytes,
1110 IOMODE_RW,
1111 GFP_NOFS);
1112 /* If no lseg, fall back to write through mds */
1113 if (pgio->pg_lseg == NULL)
1114 nfs_pageio_reset_write_mds(pgio);
1115}
1116EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1117
1118bool
1119pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
1120{
1121 struct nfs_server *server = NFS_SERVER(inode);
1122 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1123
1124 if (ld == NULL)
1125 return false;
1126 nfs_pageio_init(pgio, inode, ld->pg_read_ops, server->rsize, 0);
1127 return true;
1128}
1129
1130bool
1131pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
1132{
1133 struct nfs_server *server = NFS_SERVER(inode);
1134 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1135
1136 if (ld == NULL)
1137 return false;
1138 nfs_pageio_init(pgio, inode, ld->pg_write_ops, server->wsize, ioflags);
1139 return true;
1140}
1141
1142bool
1143pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1144 struct nfs_page *req)
1145{
1146 if (pgio->pg_lseg == NULL)
1147 return nfs_generic_pg_test(pgio, prev, req);
1148
1149 /*
1150 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1151 * Note that this test makes several assumptions:
1152 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1153 * is known to lie within the range.
1154 * - that the nfs_page being tested is known to be contiguous with the
1155 * previous nfs_page.
1156 * - Layout ranges are page aligned, so we only have to test the
1157 * start offset of the request.
1158 *
1159 * Please also note that 'end_offset' is actually the offset of the
1160 * first byte that lies outside the pnfs_layout_range. FIXME?
1161 *
1162 */
1163 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
1164 pgio->pg_lseg->pls_range.length);
1165}
1166EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1167
1168/*
1169 * Called by non rpc-based layout drivers
1170 */
1171int
1172pnfs_ld_write_done(struct nfs_write_data *data)
1173{
1174 int status;
1175
1176 if (!data->pnfs_error) {
1177 pnfs_set_layoutcommit(data);
1178 data->mds_ops->rpc_call_done(&data->task, data);
1179 data->mds_ops->rpc_release(data);
1180 return 0;
1181 }
1182
1183 dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
1184 data->pnfs_error);
1185 status = nfs_initiate_write(data, NFS_CLIENT(data->inode),
1186 data->mds_ops, NFS_FILE_SYNC);
1187 return status ? : -EAGAIN;
1188}
1189EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1190
1191static void
1192pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1193 struct nfs_write_data *data)
1194{
1195 list_splice_tail_init(&data->pages, &desc->pg_list);
1196 if (data->req && list_empty(&data->req->wb_list))
1197 nfs_list_add_request(data->req, &desc->pg_list);
1198 nfs_pageio_reset_write_mds(desc);
1199 desc->pg_recoalesce = 1;
1200 nfs_writedata_release(data);
1201}
1202
1203static enum pnfs_try_status
1204pnfs_try_to_write_data(struct nfs_write_data *wdata,
1205 const struct rpc_call_ops *call_ops,
1206 struct pnfs_layout_segment *lseg,
1207 int how)
1208{
1209 struct inode *inode = wdata->inode;
1210 enum pnfs_try_status trypnfs;
1211 struct nfs_server *nfss = NFS_SERVER(inode);
1212
1213 wdata->mds_ops = call_ops;
1214 wdata->lseg = get_lseg(lseg);
1215
1216 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1217 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1218
1219 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1220 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1221 put_lseg(wdata->lseg);
1222 wdata->lseg = NULL;
1223 } else
1224 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1225
1226 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1227 return trypnfs;
1228}
1229
1230static void
1231pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
1232{
1233 struct nfs_write_data *data;
1234 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1235 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1236
1237 desc->pg_lseg = NULL;
1238 while (!list_empty(head)) {
1239 enum pnfs_try_status trypnfs;
1240
1241 data = list_entry(head->next, struct nfs_write_data, list);
1242 list_del_init(&data->list);
1243
1244 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
1245 if (trypnfs == PNFS_NOT_ATTEMPTED)
1246 pnfs_write_through_mds(desc, data);
1247 }
1248 put_lseg(lseg);
1249}
1250
1251int
1252pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1253{
1254 LIST_HEAD(head);
1255 int ret;
1256
1257 ret = nfs_generic_flush(desc, &head);
1258 if (ret != 0) {
1259 put_lseg(desc->pg_lseg);
1260 desc->pg_lseg = NULL;
1261 return ret;
1262 }
1263 pnfs_do_multiple_writes(desc, &head, desc->pg_ioflags);
1264 return 0;
1265}
1266EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1267
1268/*
1269 * Called by non rpc-based layout drivers
1270 */
1271int
1272pnfs_ld_read_done(struct nfs_read_data *data)
1273{
1274 int status;
1275
1276 if (!data->pnfs_error) {
1277 __nfs4_read_done_cb(data);
1278 data->mds_ops->rpc_call_done(&data->task, data);
1279 data->mds_ops->rpc_release(data);
1280 return 0;
1281 }
1282
1283 dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
1284 data->pnfs_error);
1285 status = nfs_initiate_read(data, NFS_CLIENT(data->inode),
1286 data->mds_ops);
1287 return status ? : -EAGAIN;
1288}
1289EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1290
1291static void
1292pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1293 struct nfs_read_data *data)
1294{
1295 list_splice_tail_init(&data->pages, &desc->pg_list);
1296 if (data->req && list_empty(&data->req->wb_list))
1297 nfs_list_add_request(data->req, &desc->pg_list);
1298 nfs_pageio_reset_read_mds(desc);
1299 desc->pg_recoalesce = 1;
1300 nfs_readdata_release(data);
1301}
1302
1303/*
1304 * Call the appropriate parallel I/O subsystem read function.
1305 */
1306static enum pnfs_try_status
1307pnfs_try_to_read_data(struct nfs_read_data *rdata,
1308 const struct rpc_call_ops *call_ops,
1309 struct pnfs_layout_segment *lseg)
1310{
1311 struct inode *inode = rdata->inode;
1312 struct nfs_server *nfss = NFS_SERVER(inode);
1313 enum pnfs_try_status trypnfs;
1314
1315 rdata->mds_ops = call_ops;
1316 rdata->lseg = get_lseg(lseg);
1317
1318 dprintk("%s: Reading ino:%lu %u@%llu\n",
1319 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1320
1321 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1322 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1323 put_lseg(rdata->lseg);
1324 rdata->lseg = NULL;
1325 } else {
1326 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1327 }
1328 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1329 return trypnfs;
1330}
1331
1332static void
1333pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
1334{
1335 struct nfs_read_data *data;
1336 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1337 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1338
1339 desc->pg_lseg = NULL;
1340 while (!list_empty(head)) {
1341 enum pnfs_try_status trypnfs;
1342
1343 data = list_entry(head->next, struct nfs_read_data, list);
1344 list_del_init(&data->list);
1345
1346 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
1347 if (trypnfs == PNFS_NOT_ATTEMPTED)
1348 pnfs_read_through_mds(desc, data);
1349 }
1350 put_lseg(lseg);
1351}
1352
1353int
1354pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
1355{
1356 LIST_HEAD(head);
1357 int ret;
1358
1359 ret = nfs_generic_pagein(desc, &head);
1360 if (ret != 0) {
1361 put_lseg(desc->pg_lseg);
1362 desc->pg_lseg = NULL;
1363 return ret;
1364 }
1365 pnfs_do_multiple_reads(desc, &head);
1366 return 0;
1367}
1368EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
1369
1370/*
1371 * There can be multiple RW segments.
1372 */
1373static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
1374{
1375 struct pnfs_layout_segment *lseg;
1376
1377 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
1378 if (lseg->pls_range.iomode == IOMODE_RW &&
1379 test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1380 list_add(&lseg->pls_lc_list, listp);
1381 }
1382}
1383
1384void
1385pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1386{
1387 struct nfs_inode *nfsi = NFS_I(wdata->inode);
1388 loff_t end_pos = wdata->mds_offset + wdata->res.count;
1389 bool mark_as_dirty = false;
1390
1391 spin_lock(&nfsi->vfs_inode.i_lock);
1392 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1393 mark_as_dirty = true;
1394 dprintk("%s: Set layoutcommit for inode %lu ",
1395 __func__, wdata->inode->i_ino);
1396 }
1397 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &wdata->lseg->pls_flags)) {
1398 /* references matched in nfs4_layoutcommit_release */
1399 get_lseg(wdata->lseg);
1400 }
1401 if (end_pos > nfsi->layout->plh_lwb)
1402 nfsi->layout->plh_lwb = end_pos;
1403 spin_unlock(&nfsi->vfs_inode.i_lock);
1404 dprintk("%s: lseg %p end_pos %llu\n",
1405 __func__, wdata->lseg, nfsi->layout->plh_lwb);
1406
1407 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1408 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1409 if (mark_as_dirty)
1410 mark_inode_dirty_sync(wdata->inode);
1411}
1412EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1413
1414void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
1415{
1416 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
1417
1418 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
1419 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
1420}
1421
1422/*
1423 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1424 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1425 * data to disk to allow the server to recover the data if it crashes.
1426 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1427 * is off, and a COMMIT is sent to a data server, or
1428 * if WRITEs to a data server return NFS_DATA_SYNC.
1429 */
1430int
1431pnfs_layoutcommit_inode(struct inode *inode, bool sync)
1432{
1433 struct nfs4_layoutcommit_data *data;
1434 struct nfs_inode *nfsi = NFS_I(inode);
1435 loff_t end_pos;
1436 int status = 0;
1437
1438 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1439
1440 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1441 return 0;
1442
1443 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1444 data = kzalloc(sizeof(*data), GFP_NOFS);
1445 if (!data) {
1446 mark_inode_dirty_sync(inode);
1447 status = -ENOMEM;
1448 goto out;
1449 }
1450
1451 INIT_LIST_HEAD(&data->lseg_list);
1452 spin_lock(&inode->i_lock);
1453 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1454 spin_unlock(&inode->i_lock);
1455 kfree(data);
1456 goto out;
1457 }
1458
1459 pnfs_list_write_lseg(inode, &data->lseg_list);
1460
1461 end_pos = nfsi->layout->plh_lwb;
1462 nfsi->layout->plh_lwb = 0;
1463
1464 memcpy(&data->args.stateid.data, nfsi->layout->plh_stateid.data,
1465 sizeof(nfsi->layout->plh_stateid.data));
1466 spin_unlock(&inode->i_lock);
1467
1468 data->args.inode = inode;
1469 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
1470 nfs_fattr_init(&data->fattr);
1471 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1472 data->res.fattr = &data->fattr;
1473 data->args.lastbytewritten = end_pos - 1;
1474 data->res.server = NFS_SERVER(inode);
1475
1476 status = nfs4_proc_layoutcommit(data, sync);
1477out:
1478 dprintk("<-- %s status %d\n", __func__, status);
1479 return status;
1480}