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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
41#define NFSDBG_FACILITY NFSDBG_PNFS
42#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
43
44/* Locking:
45 *
46 * pnfs_spinlock:
47 * protects pnfs_modules_tbl.
48 */
49static DEFINE_SPINLOCK(pnfs_spinlock);
50
51/*
52 * pnfs_modules_tbl holds all pnfs modules
53 */
54static LIST_HEAD(pnfs_modules_tbl);
55
56static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
57static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
58 struct list_head *free_me,
59 const struct pnfs_layout_range *range,
60 u32 seq);
61static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
62 struct list_head *tmp_list);
63
64/* Return the registered pnfs layout driver module matching given id */
65static struct pnfs_layoutdriver_type *
66find_pnfs_driver_locked(u32 id)
67{
68 struct pnfs_layoutdriver_type *local;
69
70 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
71 if (local->id == id)
72 goto out;
73 local = NULL;
74out:
75 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
76 return local;
77}
78
79static struct pnfs_layoutdriver_type *
80find_pnfs_driver(u32 id)
81{
82 struct pnfs_layoutdriver_type *local;
83
84 spin_lock(&pnfs_spinlock);
85 local = find_pnfs_driver_locked(id);
86 if (local != NULL && !try_module_get(local->owner)) {
87 dprintk("%s: Could not grab reference on module\n", __func__);
88 local = NULL;
89 }
90 spin_unlock(&pnfs_spinlock);
91 return local;
92}
93
94void
95unset_pnfs_layoutdriver(struct nfs_server *nfss)
96{
97 if (nfss->pnfs_curr_ld) {
98 if (nfss->pnfs_curr_ld->clear_layoutdriver)
99 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
100 /* Decrement the MDS count. Purge the deviceid cache if zero */
101 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
102 nfs4_deviceid_purge_client(nfss->nfs_client);
103 module_put(nfss->pnfs_curr_ld->owner);
104 }
105 nfss->pnfs_curr_ld = NULL;
106}
107
108/*
109 * When the server sends a list of layout types, we choose one in the order
110 * given in the list below.
111 *
112 * FIXME: should this list be configurable in some fashion? module param?
113 * mount option? something else?
114 */
115static const u32 ld_prefs[] = {
116 LAYOUT_SCSI,
117 LAYOUT_BLOCK_VOLUME,
118 LAYOUT_OSD2_OBJECTS,
119 LAYOUT_FLEX_FILES,
120 LAYOUT_NFSV4_1_FILES,
121 0
122};
123
124static int
125ld_cmp(const void *e1, const void *e2)
126{
127 u32 ld1 = *((u32 *)e1);
128 u32 ld2 = *((u32 *)e2);
129 int i;
130
131 for (i = 0; ld_prefs[i] != 0; i++) {
132 if (ld1 == ld_prefs[i])
133 return -1;
134
135 if (ld2 == ld_prefs[i])
136 return 1;
137 }
138 return 0;
139}
140
141/*
142 * Try to set the server's pnfs module to the pnfs layout type specified by id.
143 * Currently only one pNFS layout driver per filesystem is supported.
144 *
145 * @ids array of layout types supported by MDS.
146 */
147void
148set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
149 struct nfs_fsinfo *fsinfo)
150{
151 struct pnfs_layoutdriver_type *ld_type = NULL;
152 u32 id;
153 int i;
154
155 if (fsinfo->nlayouttypes == 0)
156 goto out_no_driver;
157 if (!(server->nfs_client->cl_exchange_flags &
158 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
159 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
160 __func__, server->nfs_client->cl_exchange_flags);
161 goto out_no_driver;
162 }
163
164 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
165 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
166
167 for (i = 0; i < fsinfo->nlayouttypes; i++) {
168 id = fsinfo->layouttype[i];
169 ld_type = find_pnfs_driver(id);
170 if (!ld_type) {
171 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
172 id);
173 ld_type = find_pnfs_driver(id);
174 }
175 if (ld_type)
176 break;
177 }
178
179 if (!ld_type) {
180 dprintk("%s: No pNFS module found!\n", __func__);
181 goto out_no_driver;
182 }
183
184 server->pnfs_curr_ld = ld_type;
185 if (ld_type->set_layoutdriver
186 && ld_type->set_layoutdriver(server, mntfh)) {
187 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
188 "driver %u.\n", __func__, id);
189 module_put(ld_type->owner);
190 goto out_no_driver;
191 }
192 /* Bump the MDS count */
193 atomic_inc(&server->nfs_client->cl_mds_count);
194
195 dprintk("%s: pNFS module for %u set\n", __func__, id);
196 return;
197
198out_no_driver:
199 dprintk("%s: Using NFSv4 I/O\n", __func__);
200 server->pnfs_curr_ld = NULL;
201}
202
203int
204pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
205{
206 int status = -EINVAL;
207 struct pnfs_layoutdriver_type *tmp;
208
209 if (ld_type->id == 0) {
210 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
211 return status;
212 }
213 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
214 printk(KERN_ERR "NFS: %s Layout driver must provide "
215 "alloc_lseg and free_lseg.\n", __func__);
216 return status;
217 }
218
219 spin_lock(&pnfs_spinlock);
220 tmp = find_pnfs_driver_locked(ld_type->id);
221 if (!tmp) {
222 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
223 status = 0;
224 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
225 ld_type->name);
226 } else {
227 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
228 __func__, ld_type->id);
229 }
230 spin_unlock(&pnfs_spinlock);
231
232 return status;
233}
234EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
235
236void
237pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
238{
239 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
240 spin_lock(&pnfs_spinlock);
241 list_del(&ld_type->pnfs_tblid);
242 spin_unlock(&pnfs_spinlock);
243}
244EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
245
246/*
247 * pNFS client layout cache
248 */
249
250/* Need to hold i_lock if caller does not already hold reference */
251void
252pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
253{
254 refcount_inc(&lo->plh_refcount);
255}
256
257static struct pnfs_layout_hdr *
258pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
259{
260 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
261 return ld->alloc_layout_hdr(ino, gfp_flags);
262}
263
264static void
265pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
266{
267 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
268 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
269
270 if (!list_empty(&lo->plh_layouts)) {
271 struct nfs_client *clp = server->nfs_client;
272
273 spin_lock(&clp->cl_lock);
274 list_del_init(&lo->plh_layouts);
275 spin_unlock(&clp->cl_lock);
276 }
277 put_rpccred(lo->plh_lc_cred);
278 return ld->free_layout_hdr(lo);
279}
280
281static void
282pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
283{
284 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
285 dprintk("%s: freeing layout cache %p\n", __func__, lo);
286 nfsi->layout = NULL;
287 /* Reset MDS Threshold I/O counters */
288 nfsi->write_io = 0;
289 nfsi->read_io = 0;
290}
291
292void
293pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
294{
295 struct inode *inode;
296
297 if (!lo)
298 return;
299 inode = lo->plh_inode;
300 pnfs_layoutreturn_before_put_layout_hdr(lo);
301
302 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
303 if (!list_empty(&lo->plh_segs))
304 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
305 pnfs_detach_layout_hdr(lo);
306 spin_unlock(&inode->i_lock);
307 pnfs_free_layout_hdr(lo);
308 }
309}
310
311static void
312pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
313 u32 seq)
314{
315 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
316 iomode = IOMODE_ANY;
317 lo->plh_return_iomode = iomode;
318 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
319 if (seq != 0) {
320 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
321 lo->plh_return_seq = seq;
322 }
323}
324
325static void
326pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
327{
328 struct pnfs_layout_segment *lseg;
329 lo->plh_return_iomode = 0;
330 lo->plh_return_seq = 0;
331 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
332 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
333 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
334 continue;
335 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
336 }
337}
338
339static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
340{
341 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
342 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
343 smp_mb__after_atomic();
344 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
345 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
346}
347
348static void
349pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
350 struct list_head *free_me)
351{
352 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
353 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
354 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
355 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
356 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
357 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
358}
359
360/*
361 * Update the seqid of a layout stateid
362 */
363bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, struct inode *inode)
364{
365 struct pnfs_layout_hdr *lo;
366 bool ret = false;
367
368 spin_lock(&inode->i_lock);
369 lo = NFS_I(inode)->layout;
370 if (lo && nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
371 dst->seqid = lo->plh_stateid.seqid;
372 ret = true;
373 }
374 spin_unlock(&inode->i_lock);
375 return ret;
376}
377
378/*
379 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
380 *
381 * In order to continue using the pnfs_layout_hdr, a full recovery
382 * is required.
383 * Note that caller must hold inode->i_lock.
384 */
385int
386pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
387 struct list_head *lseg_list)
388{
389 struct pnfs_layout_range range = {
390 .iomode = IOMODE_ANY,
391 .offset = 0,
392 .length = NFS4_MAX_UINT64,
393 };
394 struct pnfs_layout_segment *lseg, *next;
395
396 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
397 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
398 pnfs_clear_lseg_state(lseg, lseg_list);
399 pnfs_clear_layoutreturn_info(lo);
400 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
401 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
402 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
403 pnfs_clear_layoutreturn_waitbit(lo);
404 return !list_empty(&lo->plh_segs);
405}
406
407static int
408pnfs_iomode_to_fail_bit(u32 iomode)
409{
410 return iomode == IOMODE_RW ?
411 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
412}
413
414static void
415pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
416{
417 lo->plh_retry_timestamp = jiffies;
418 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
419 refcount_inc(&lo->plh_refcount);
420}
421
422static void
423pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
424{
425 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
426 refcount_dec(&lo->plh_refcount);
427}
428
429static void
430pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
431{
432 struct inode *inode = lo->plh_inode;
433 struct pnfs_layout_range range = {
434 .iomode = iomode,
435 .offset = 0,
436 .length = NFS4_MAX_UINT64,
437 };
438 LIST_HEAD(head);
439
440 spin_lock(&inode->i_lock);
441 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
442 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
443 spin_unlock(&inode->i_lock);
444 pnfs_free_lseg_list(&head);
445 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
446 iomode == IOMODE_RW ? "RW" : "READ");
447}
448
449static bool
450pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
451{
452 unsigned long start, end;
453 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
454
455 if (test_bit(fail_bit, &lo->plh_flags) == 0)
456 return false;
457 end = jiffies;
458 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
459 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
460 /* It is time to retry the failed layoutgets */
461 pnfs_layout_clear_fail_bit(lo, fail_bit);
462 return false;
463 }
464 return true;
465}
466
467static void
468pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
469 const struct pnfs_layout_range *range,
470 const nfs4_stateid *stateid)
471{
472 INIT_LIST_HEAD(&lseg->pls_list);
473 INIT_LIST_HEAD(&lseg->pls_lc_list);
474 refcount_set(&lseg->pls_refcount, 1);
475 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
476 lseg->pls_layout = lo;
477 lseg->pls_range = *range;
478 lseg->pls_seq = be32_to_cpu(stateid->seqid);
479}
480
481static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
482{
483 if (lseg != NULL) {
484 struct inode *inode = lseg->pls_layout->plh_inode;
485 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
486 }
487}
488
489static void
490pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
491 struct pnfs_layout_segment *lseg)
492{
493 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
494 list_del_init(&lseg->pls_list);
495 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
496 refcount_dec(&lo->plh_refcount);
497 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
498 return;
499 if (list_empty(&lo->plh_segs) &&
500 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
501 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
502 if (atomic_read(&lo->plh_outstanding) == 0)
503 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
504 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
505 }
506}
507
508static bool
509pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
510 struct pnfs_layout_segment *lseg)
511{
512 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
513 pnfs_layout_is_valid(lo)) {
514 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
515 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
516 return true;
517 }
518 return false;
519}
520
521void
522pnfs_put_lseg(struct pnfs_layout_segment *lseg)
523{
524 struct pnfs_layout_hdr *lo;
525 struct inode *inode;
526
527 if (!lseg)
528 return;
529
530 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
531 refcount_read(&lseg->pls_refcount),
532 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
533
534 lo = lseg->pls_layout;
535 inode = lo->plh_inode;
536
537 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
538 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
539 spin_unlock(&inode->i_lock);
540 return;
541 }
542 pnfs_get_layout_hdr(lo);
543 pnfs_layout_remove_lseg(lo, lseg);
544 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
545 lseg = NULL;
546 spin_unlock(&inode->i_lock);
547 pnfs_free_lseg(lseg);
548 pnfs_put_layout_hdr(lo);
549 }
550}
551EXPORT_SYMBOL_GPL(pnfs_put_lseg);
552
553/*
554 * is l2 fully contained in l1?
555 * start1 end1
556 * [----------------------------------)
557 * start2 end2
558 * [----------------)
559 */
560static bool
561pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
562 const struct pnfs_layout_range *l2)
563{
564 u64 start1 = l1->offset;
565 u64 end1 = pnfs_end_offset(start1, l1->length);
566 u64 start2 = l2->offset;
567 u64 end2 = pnfs_end_offset(start2, l2->length);
568
569 return (start1 <= start2) && (end1 >= end2);
570}
571
572static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
573 struct list_head *tmp_list)
574{
575 if (!refcount_dec_and_test(&lseg->pls_refcount))
576 return false;
577 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
578 list_add(&lseg->pls_list, tmp_list);
579 return true;
580}
581
582/* Returns 1 if lseg is removed from list, 0 otherwise */
583static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
584 struct list_head *tmp_list)
585{
586 int rv = 0;
587
588 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
589 /* Remove the reference keeping the lseg in the
590 * list. It will now be removed when all
591 * outstanding io is finished.
592 */
593 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
594 refcount_read(&lseg->pls_refcount));
595 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
596 rv = 1;
597 }
598 return rv;
599}
600
601/*
602 * Compare 2 layout stateid sequence ids, to see which is newer,
603 * taking into account wraparound issues.
604 */
605static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
606{
607 return (s32)(s1 - s2) > 0;
608}
609
610static bool
611pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
612 const struct pnfs_layout_range *recall_range)
613{
614 return (recall_range->iomode == IOMODE_ANY ||
615 lseg_range->iomode == recall_range->iomode) &&
616 pnfs_lseg_range_intersecting(lseg_range, recall_range);
617}
618
619static bool
620pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
621 const struct pnfs_layout_range *recall_range,
622 u32 seq)
623{
624 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
625 return false;
626 if (recall_range == NULL)
627 return true;
628 return pnfs_should_free_range(&lseg->pls_range, recall_range);
629}
630
631/**
632 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
633 * @lo: layout header containing the lsegs
634 * @tmp_list: list head where doomed lsegs should go
635 * @recall_range: optional recall range argument to match (may be NULL)
636 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
637 *
638 * Walk the list of lsegs in the layout header, and tear down any that should
639 * be destroyed. If "recall_range" is specified then the segment must match
640 * that range. If "seq" is non-zero, then only match segments that were handed
641 * out at or before that sequence.
642 *
643 * Returns number of matching invalid lsegs remaining in list after scanning
644 * it and purging them.
645 */
646int
647pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
648 struct list_head *tmp_list,
649 const struct pnfs_layout_range *recall_range,
650 u32 seq)
651{
652 struct pnfs_layout_segment *lseg, *next;
653 int remaining = 0;
654
655 dprintk("%s:Begin lo %p\n", __func__, lo);
656
657 if (list_empty(&lo->plh_segs))
658 return 0;
659 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
660 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
661 dprintk("%s: freeing lseg %p iomode %d seq %u "
662 "offset %llu length %llu\n", __func__,
663 lseg, lseg->pls_range.iomode, lseg->pls_seq,
664 lseg->pls_range.offset, lseg->pls_range.length);
665 if (!mark_lseg_invalid(lseg, tmp_list))
666 remaining++;
667 }
668 dprintk("%s:Return %i\n", __func__, remaining);
669 return remaining;
670}
671
672static void
673pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
674 struct list_head *free_me,
675 const struct pnfs_layout_range *range,
676 u32 seq)
677{
678 struct pnfs_layout_segment *lseg, *next;
679
680 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
681 if (pnfs_match_lseg_recall(lseg, range, seq))
682 list_move_tail(&lseg->pls_list, free_me);
683 }
684}
685
686/* note free_me must contain lsegs from a single layout_hdr */
687void
688pnfs_free_lseg_list(struct list_head *free_me)
689{
690 struct pnfs_layout_segment *lseg, *tmp;
691
692 if (list_empty(free_me))
693 return;
694
695 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
696 list_del(&lseg->pls_list);
697 pnfs_free_lseg(lseg);
698 }
699}
700
701void
702pnfs_destroy_layout(struct nfs_inode *nfsi)
703{
704 struct pnfs_layout_hdr *lo;
705 LIST_HEAD(tmp_list);
706
707 spin_lock(&nfsi->vfs_inode.i_lock);
708 lo = nfsi->layout;
709 if (lo) {
710 pnfs_get_layout_hdr(lo);
711 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
712 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
713 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
714 spin_unlock(&nfsi->vfs_inode.i_lock);
715 pnfs_free_lseg_list(&tmp_list);
716 nfs_commit_inode(&nfsi->vfs_inode, 0);
717 pnfs_put_layout_hdr(lo);
718 } else
719 spin_unlock(&nfsi->vfs_inode.i_lock);
720}
721EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
722
723static bool
724pnfs_layout_add_bulk_destroy_list(struct inode *inode,
725 struct list_head *layout_list)
726{
727 struct pnfs_layout_hdr *lo;
728 bool ret = false;
729
730 spin_lock(&inode->i_lock);
731 lo = NFS_I(inode)->layout;
732 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
733 pnfs_get_layout_hdr(lo);
734 list_add(&lo->plh_bulk_destroy, layout_list);
735 ret = true;
736 }
737 spin_unlock(&inode->i_lock);
738 return ret;
739}
740
741/* Caller must hold rcu_read_lock and clp->cl_lock */
742static int
743pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
744 struct nfs_server *server,
745 struct list_head *layout_list)
746{
747 struct pnfs_layout_hdr *lo, *next;
748 struct inode *inode;
749
750 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
751 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
752 continue;
753 inode = igrab(lo->plh_inode);
754 if (inode == NULL)
755 continue;
756 list_del_init(&lo->plh_layouts);
757 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
758 continue;
759 rcu_read_unlock();
760 spin_unlock(&clp->cl_lock);
761 iput(inode);
762 spin_lock(&clp->cl_lock);
763 rcu_read_lock();
764 return -EAGAIN;
765 }
766 return 0;
767}
768
769static int
770pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
771 bool is_bulk_recall)
772{
773 struct pnfs_layout_hdr *lo;
774 struct inode *inode;
775 LIST_HEAD(lseg_list);
776 int ret = 0;
777
778 while (!list_empty(layout_list)) {
779 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
780 plh_bulk_destroy);
781 dprintk("%s freeing layout for inode %lu\n", __func__,
782 lo->plh_inode->i_ino);
783 inode = lo->plh_inode;
784
785 pnfs_layoutcommit_inode(inode, false);
786
787 spin_lock(&inode->i_lock);
788 list_del_init(&lo->plh_bulk_destroy);
789 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
790 if (is_bulk_recall)
791 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
792 ret = -EAGAIN;
793 }
794 spin_unlock(&inode->i_lock);
795 pnfs_free_lseg_list(&lseg_list);
796 /* Free all lsegs that are attached to commit buckets */
797 nfs_commit_inode(inode, 0);
798 pnfs_put_layout_hdr(lo);
799 iput(inode);
800 }
801 return ret;
802}
803
804int
805pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
806 struct nfs_fsid *fsid,
807 bool is_recall)
808{
809 struct nfs_server *server;
810 LIST_HEAD(layout_list);
811
812 spin_lock(&clp->cl_lock);
813 rcu_read_lock();
814restart:
815 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
816 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
817 continue;
818 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
819 server,
820 &layout_list) != 0)
821 goto restart;
822 }
823 rcu_read_unlock();
824 spin_unlock(&clp->cl_lock);
825
826 if (list_empty(&layout_list))
827 return 0;
828 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
829}
830
831int
832pnfs_destroy_layouts_byclid(struct nfs_client *clp,
833 bool is_recall)
834{
835 struct nfs_server *server;
836 LIST_HEAD(layout_list);
837
838 spin_lock(&clp->cl_lock);
839 rcu_read_lock();
840restart:
841 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
842 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
843 server,
844 &layout_list) != 0)
845 goto restart;
846 }
847 rcu_read_unlock();
848 spin_unlock(&clp->cl_lock);
849
850 if (list_empty(&layout_list))
851 return 0;
852 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
853}
854
855/*
856 * Called by the state manger to remove all layouts established under an
857 * expired lease.
858 */
859void
860pnfs_destroy_all_layouts(struct nfs_client *clp)
861{
862 nfs4_deviceid_mark_client_invalid(clp);
863 nfs4_deviceid_purge_client(clp);
864
865 pnfs_destroy_layouts_byclid(clp, false);
866}
867
868/* update lo->plh_stateid with new if is more recent */
869void
870pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
871 bool update_barrier)
872{
873 u32 oldseq, newseq, new_barrier = 0;
874
875 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
876 newseq = be32_to_cpu(new->seqid);
877
878 if (!pnfs_layout_is_valid(lo)) {
879 nfs4_stateid_copy(&lo->plh_stateid, new);
880 lo->plh_barrier = newseq;
881 pnfs_clear_layoutreturn_info(lo);
882 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
883 return;
884 }
885 if (pnfs_seqid_is_newer(newseq, oldseq)) {
886 nfs4_stateid_copy(&lo->plh_stateid, new);
887 /*
888 * Because of wraparound, we want to keep the barrier
889 * "close" to the current seqids.
890 */
891 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
892 }
893 if (update_barrier)
894 new_barrier = be32_to_cpu(new->seqid);
895 else if (new_barrier == 0)
896 return;
897 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
898 lo->plh_barrier = new_barrier;
899}
900
901static bool
902pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
903 const nfs4_stateid *stateid)
904{
905 u32 seqid = be32_to_cpu(stateid->seqid);
906
907 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
908}
909
910/* lget is set to 1 if called from inside send_layoutget call chain */
911static bool
912pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
913{
914 return lo->plh_block_lgets ||
915 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
916}
917
918/*
919 * Get layout from server.
920 * for now, assume that whole file layouts are requested.
921 * arg->offset: 0
922 * arg->length: all ones
923 */
924static struct pnfs_layout_segment *
925send_layoutget(struct pnfs_layout_hdr *lo,
926 struct nfs_open_context *ctx,
927 nfs4_stateid *stateid,
928 const struct pnfs_layout_range *range,
929 long *timeout, gfp_t gfp_flags)
930{
931 struct inode *ino = lo->plh_inode;
932 struct nfs_server *server = NFS_SERVER(ino);
933 struct nfs4_layoutget *lgp;
934 loff_t i_size;
935
936 dprintk("--> %s\n", __func__);
937
938 /*
939 * Synchronously retrieve layout information from server and
940 * store in lseg. If we race with a concurrent seqid morphing
941 * op, then re-send the LAYOUTGET.
942 */
943 lgp = kzalloc(sizeof(*lgp), gfp_flags);
944 if (lgp == NULL)
945 return ERR_PTR(-ENOMEM);
946
947 i_size = i_size_read(ino);
948
949 lgp->args.minlength = PAGE_SIZE;
950 if (lgp->args.minlength > range->length)
951 lgp->args.minlength = range->length;
952 if (range->iomode == IOMODE_READ) {
953 if (range->offset >= i_size)
954 lgp->args.minlength = 0;
955 else if (i_size - range->offset < lgp->args.minlength)
956 lgp->args.minlength = i_size - range->offset;
957 }
958 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
959 pnfs_copy_range(&lgp->args.range, range);
960 lgp->args.type = server->pnfs_curr_ld->id;
961 lgp->args.inode = ino;
962 lgp->args.ctx = get_nfs_open_context(ctx);
963 nfs4_stateid_copy(&lgp->args.stateid, stateid);
964 lgp->gfp_flags = gfp_flags;
965 lgp->cred = lo->plh_lc_cred;
966
967 return nfs4_proc_layoutget(lgp, timeout, gfp_flags);
968}
969
970static void pnfs_clear_layoutcommit(struct inode *inode,
971 struct list_head *head)
972{
973 struct nfs_inode *nfsi = NFS_I(inode);
974 struct pnfs_layout_segment *lseg, *tmp;
975
976 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
977 return;
978 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
979 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
980 continue;
981 pnfs_lseg_dec_and_remove_zero(lseg, head);
982 }
983}
984
985void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
986 const nfs4_stateid *arg_stateid,
987 const struct pnfs_layout_range *range,
988 const nfs4_stateid *stateid)
989{
990 struct inode *inode = lo->plh_inode;
991 LIST_HEAD(freeme);
992
993 spin_lock(&inode->i_lock);
994 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
995 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
996 goto out_unlock;
997 if (stateid) {
998 u32 seq = be32_to_cpu(arg_stateid->seqid);
999
1000 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1001 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1002 pnfs_set_layout_stateid(lo, stateid, true);
1003 } else
1004 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1005out_unlock:
1006 pnfs_clear_layoutreturn_waitbit(lo);
1007 spin_unlock(&inode->i_lock);
1008 pnfs_free_lseg_list(&freeme);
1009
1010}
1011
1012static bool
1013pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1014 nfs4_stateid *stateid,
1015 enum pnfs_iomode *iomode)
1016{
1017 /* Serialise LAYOUTGET/LAYOUTRETURN */
1018 if (atomic_read(&lo->plh_outstanding) != 0)
1019 return false;
1020 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1021 return false;
1022 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1023 pnfs_get_layout_hdr(lo);
1024 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1025 if (stateid != NULL) {
1026 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1027 if (lo->plh_return_seq != 0)
1028 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1029 }
1030 if (iomode != NULL)
1031 *iomode = lo->plh_return_iomode;
1032 pnfs_clear_layoutreturn_info(lo);
1033 return true;
1034 }
1035 if (stateid != NULL)
1036 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1037 if (iomode != NULL)
1038 *iomode = IOMODE_ANY;
1039 return true;
1040}
1041
1042static void
1043pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1044 struct pnfs_layout_hdr *lo,
1045 const nfs4_stateid *stateid,
1046 enum pnfs_iomode iomode)
1047{
1048 struct inode *inode = lo->plh_inode;
1049
1050 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1051 args->inode = inode;
1052 args->range.iomode = iomode;
1053 args->range.offset = 0;
1054 args->range.length = NFS4_MAX_UINT64;
1055 args->layout = lo;
1056 nfs4_stateid_copy(&args->stateid, stateid);
1057}
1058
1059static int
1060pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
1061 enum pnfs_iomode iomode, bool sync)
1062{
1063 struct inode *ino = lo->plh_inode;
1064 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1065 struct nfs4_layoutreturn *lrp;
1066 int status = 0;
1067
1068 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1069 if (unlikely(lrp == NULL)) {
1070 status = -ENOMEM;
1071 spin_lock(&ino->i_lock);
1072 pnfs_clear_layoutreturn_waitbit(lo);
1073 spin_unlock(&ino->i_lock);
1074 pnfs_put_layout_hdr(lo);
1075 goto out;
1076 }
1077
1078 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1079 lrp->args.ld_private = &lrp->ld_private;
1080 lrp->clp = NFS_SERVER(ino)->nfs_client;
1081 lrp->cred = lo->plh_lc_cred;
1082 if (ld->prepare_layoutreturn)
1083 ld->prepare_layoutreturn(&lrp->args);
1084
1085 status = nfs4_proc_layoutreturn(lrp, sync);
1086out:
1087 dprintk("<-- %s status: %d\n", __func__, status);
1088 return status;
1089}
1090
1091/* Return true if layoutreturn is needed */
1092static bool
1093pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1094{
1095 struct pnfs_layout_segment *s;
1096
1097 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1098 return false;
1099
1100 /* Defer layoutreturn until all lsegs are done */
1101 list_for_each_entry(s, &lo->plh_segs, pls_list) {
1102 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1103 return false;
1104 }
1105
1106 return true;
1107}
1108
1109static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1110{
1111 struct inode *inode= lo->plh_inode;
1112
1113 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1114 return;
1115 spin_lock(&inode->i_lock);
1116 if (pnfs_layout_need_return(lo)) {
1117 nfs4_stateid stateid;
1118 enum pnfs_iomode iomode;
1119 bool send;
1120
1121 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1122 spin_unlock(&inode->i_lock);
1123 if (send) {
1124 /* Send an async layoutreturn so we dont deadlock */
1125 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1126 }
1127 } else
1128 spin_unlock(&inode->i_lock);
1129}
1130
1131/*
1132 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1133 * when the layout segment list is empty.
1134 *
1135 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1136 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1137 * deviceid is marked invalid.
1138 */
1139int
1140_pnfs_return_layout(struct inode *ino)
1141{
1142 struct pnfs_layout_hdr *lo = NULL;
1143 struct nfs_inode *nfsi = NFS_I(ino);
1144 LIST_HEAD(tmp_list);
1145 nfs4_stateid stateid;
1146 int status = 0;
1147 bool send;
1148
1149 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1150
1151 spin_lock(&ino->i_lock);
1152 lo = nfsi->layout;
1153 if (!lo) {
1154 spin_unlock(&ino->i_lock);
1155 dprintk("NFS: %s no layout to return\n", __func__);
1156 goto out;
1157 }
1158 /* Reference matched in nfs4_layoutreturn_release */
1159 pnfs_get_layout_hdr(lo);
1160 /* Is there an outstanding layoutreturn ? */
1161 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1162 spin_unlock(&ino->i_lock);
1163 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1164 TASK_UNINTERRUPTIBLE))
1165 goto out_put_layout_hdr;
1166 spin_lock(&ino->i_lock);
1167 }
1168 pnfs_clear_layoutcommit(ino, &tmp_list);
1169 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1170
1171 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1172 struct pnfs_layout_range range = {
1173 .iomode = IOMODE_ANY,
1174 .offset = 0,
1175 .length = NFS4_MAX_UINT64,
1176 };
1177 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1178 }
1179
1180 /* Don't send a LAYOUTRETURN if list was initially empty */
1181 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1182 spin_unlock(&ino->i_lock);
1183 dprintk("NFS: %s no layout segments to return\n", __func__);
1184 goto out_put_layout_hdr;
1185 }
1186
1187 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
1188 spin_unlock(&ino->i_lock);
1189 if (send)
1190 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1191out_put_layout_hdr:
1192 pnfs_free_lseg_list(&tmp_list);
1193 pnfs_put_layout_hdr(lo);
1194out:
1195 dprintk("<-- %s status: %d\n", __func__, status);
1196 return status;
1197}
1198
1199int
1200pnfs_commit_and_return_layout(struct inode *inode)
1201{
1202 struct pnfs_layout_hdr *lo;
1203 int ret;
1204
1205 spin_lock(&inode->i_lock);
1206 lo = NFS_I(inode)->layout;
1207 if (lo == NULL) {
1208 spin_unlock(&inode->i_lock);
1209 return 0;
1210 }
1211 pnfs_get_layout_hdr(lo);
1212 /* Block new layoutgets and read/write to ds */
1213 lo->plh_block_lgets++;
1214 spin_unlock(&inode->i_lock);
1215 filemap_fdatawait(inode->i_mapping);
1216 ret = pnfs_layoutcommit_inode(inode, true);
1217 if (ret == 0)
1218 ret = _pnfs_return_layout(inode);
1219 spin_lock(&inode->i_lock);
1220 lo->plh_block_lgets--;
1221 spin_unlock(&inode->i_lock);
1222 pnfs_put_layout_hdr(lo);
1223 return ret;
1224}
1225
1226bool pnfs_roc(struct inode *ino,
1227 struct nfs4_layoutreturn_args *args,
1228 struct nfs4_layoutreturn_res *res,
1229 const struct rpc_cred *cred)
1230{
1231 struct nfs_inode *nfsi = NFS_I(ino);
1232 struct nfs_open_context *ctx;
1233 struct nfs4_state *state;
1234 struct pnfs_layout_hdr *lo;
1235 struct pnfs_layout_segment *lseg, *next;
1236 nfs4_stateid stateid;
1237 enum pnfs_iomode iomode = 0;
1238 bool layoutreturn = false, roc = false;
1239 bool skip_read = false;
1240
1241 if (!nfs_have_layout(ino))
1242 return false;
1243retry:
1244 spin_lock(&ino->i_lock);
1245 lo = nfsi->layout;
1246 if (!lo || !pnfs_layout_is_valid(lo) ||
1247 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1248 lo = NULL;
1249 goto out_noroc;
1250 }
1251 pnfs_get_layout_hdr(lo);
1252 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1253 spin_unlock(&ino->i_lock);
1254 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1255 TASK_UNINTERRUPTIBLE);
1256 pnfs_put_layout_hdr(lo);
1257 goto retry;
1258 }
1259
1260 /* no roc if we hold a delegation */
1261 if (nfs4_check_delegation(ino, FMODE_READ)) {
1262 if (nfs4_check_delegation(ino, FMODE_WRITE))
1263 goto out_noroc;
1264 skip_read = true;
1265 }
1266
1267 list_for_each_entry(ctx, &nfsi->open_files, list) {
1268 state = ctx->state;
1269 if (state == NULL)
1270 continue;
1271 /* Don't return layout if there is open file state */
1272 if (state->state & FMODE_WRITE)
1273 goto out_noroc;
1274 if (state->state & FMODE_READ)
1275 skip_read = true;
1276 }
1277
1278
1279 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1280 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1281 continue;
1282 /* If we are sending layoutreturn, invalidate all valid lsegs */
1283 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1284 continue;
1285 /*
1286 * Note: mark lseg for return so pnfs_layout_remove_lseg
1287 * doesn't invalidate the layout for us.
1288 */
1289 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1290 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1291 continue;
1292 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1293 }
1294
1295 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1296 goto out_noroc;
1297
1298 /* ROC in two conditions:
1299 * 1. there are ROC lsegs
1300 * 2. we don't send layoutreturn
1301 */
1302 /* lo ref dropped in pnfs_roc_release() */
1303 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1304 /* If the creds don't match, we can't compound the layoutreturn */
1305 if (!layoutreturn || cred != lo->plh_lc_cred)
1306 goto out_noroc;
1307
1308 roc = layoutreturn;
1309 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1310 res->lrs_present = 0;
1311 layoutreturn = false;
1312
1313out_noroc:
1314 spin_unlock(&ino->i_lock);
1315 pnfs_layoutcommit_inode(ino, true);
1316 if (roc) {
1317 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1318 if (ld->prepare_layoutreturn)
1319 ld->prepare_layoutreturn(args);
1320 pnfs_put_layout_hdr(lo);
1321 return true;
1322 }
1323 if (layoutreturn)
1324 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
1325 pnfs_put_layout_hdr(lo);
1326 return false;
1327}
1328
1329void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1330 struct nfs4_layoutreturn_res *res,
1331 int ret)
1332{
1333 struct pnfs_layout_hdr *lo = args->layout;
1334 const nfs4_stateid *arg_stateid = NULL;
1335 const nfs4_stateid *res_stateid = NULL;
1336 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1337
1338 if (ret == 0) {
1339 arg_stateid = &args->stateid;
1340 if (res->lrs_present)
1341 res_stateid = &res->stateid;
1342 }
1343 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1344 res_stateid);
1345 if (ld_private && ld_private->ops && ld_private->ops->free)
1346 ld_private->ops->free(ld_private);
1347 pnfs_put_layout_hdr(lo);
1348 trace_nfs4_layoutreturn_on_close(args->inode, 0);
1349}
1350
1351bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1352{
1353 struct nfs_inode *nfsi = NFS_I(ino);
1354 struct pnfs_layout_hdr *lo;
1355 bool sleep = false;
1356
1357 /* we might not have grabbed lo reference. so need to check under
1358 * i_lock */
1359 spin_lock(&ino->i_lock);
1360 lo = nfsi->layout;
1361 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1362 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1363 sleep = true;
1364 }
1365 spin_unlock(&ino->i_lock);
1366 return sleep;
1367}
1368
1369/*
1370 * Compare two layout segments for sorting into layout cache.
1371 * We want to preferentially return RW over RO layouts, so ensure those
1372 * are seen first.
1373 */
1374static s64
1375pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1376 const struct pnfs_layout_range *l2)
1377{
1378 s64 d;
1379
1380 /* high offset > low offset */
1381 d = l1->offset - l2->offset;
1382 if (d)
1383 return d;
1384
1385 /* short length > long length */
1386 d = l2->length - l1->length;
1387 if (d)
1388 return d;
1389
1390 /* read > read/write */
1391 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1392}
1393
1394static bool
1395pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1396 const struct pnfs_layout_range *l2)
1397{
1398 return pnfs_lseg_range_cmp(l1, l2) > 0;
1399}
1400
1401static bool
1402pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1403 struct pnfs_layout_segment *old)
1404{
1405 return false;
1406}
1407
1408void
1409pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1410 struct pnfs_layout_segment *lseg,
1411 bool (*is_after)(const struct pnfs_layout_range *,
1412 const struct pnfs_layout_range *),
1413 bool (*do_merge)(struct pnfs_layout_segment *,
1414 struct pnfs_layout_segment *),
1415 struct list_head *free_me)
1416{
1417 struct pnfs_layout_segment *lp, *tmp;
1418
1419 dprintk("%s:Begin\n", __func__);
1420
1421 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1422 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1423 continue;
1424 if (do_merge(lseg, lp)) {
1425 mark_lseg_invalid(lp, free_me);
1426 continue;
1427 }
1428 if (is_after(&lseg->pls_range, &lp->pls_range))
1429 continue;
1430 list_add_tail(&lseg->pls_list, &lp->pls_list);
1431 dprintk("%s: inserted lseg %p "
1432 "iomode %d offset %llu length %llu before "
1433 "lp %p iomode %d offset %llu length %llu\n",
1434 __func__, lseg, lseg->pls_range.iomode,
1435 lseg->pls_range.offset, lseg->pls_range.length,
1436 lp, lp->pls_range.iomode, lp->pls_range.offset,
1437 lp->pls_range.length);
1438 goto out;
1439 }
1440 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1441 dprintk("%s: inserted lseg %p "
1442 "iomode %d offset %llu length %llu at tail\n",
1443 __func__, lseg, lseg->pls_range.iomode,
1444 lseg->pls_range.offset, lseg->pls_range.length);
1445out:
1446 pnfs_get_layout_hdr(lo);
1447
1448 dprintk("%s:Return\n", __func__);
1449}
1450EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1451
1452static void
1453pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1454 struct pnfs_layout_segment *lseg,
1455 struct list_head *free_me)
1456{
1457 struct inode *inode = lo->plh_inode;
1458 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1459
1460 if (ld->add_lseg != NULL)
1461 ld->add_lseg(lo, lseg, free_me);
1462 else
1463 pnfs_generic_layout_insert_lseg(lo, lseg,
1464 pnfs_lseg_range_is_after,
1465 pnfs_lseg_no_merge,
1466 free_me);
1467}
1468
1469static struct pnfs_layout_hdr *
1470alloc_init_layout_hdr(struct inode *ino,
1471 struct nfs_open_context *ctx,
1472 gfp_t gfp_flags)
1473{
1474 struct pnfs_layout_hdr *lo;
1475
1476 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1477 if (!lo)
1478 return NULL;
1479 refcount_set(&lo->plh_refcount, 1);
1480 INIT_LIST_HEAD(&lo->plh_layouts);
1481 INIT_LIST_HEAD(&lo->plh_segs);
1482 INIT_LIST_HEAD(&lo->plh_return_segs);
1483 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1484 lo->plh_inode = ino;
1485 lo->plh_lc_cred = get_rpccred(ctx->cred);
1486 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1487 return lo;
1488}
1489
1490static struct pnfs_layout_hdr *
1491pnfs_find_alloc_layout(struct inode *ino,
1492 struct nfs_open_context *ctx,
1493 gfp_t gfp_flags)
1494 __releases(&ino->i_lock)
1495 __acquires(&ino->i_lock)
1496{
1497 struct nfs_inode *nfsi = NFS_I(ino);
1498 struct pnfs_layout_hdr *new = NULL;
1499
1500 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1501
1502 if (nfsi->layout != NULL)
1503 goto out_existing;
1504 spin_unlock(&ino->i_lock);
1505 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1506 spin_lock(&ino->i_lock);
1507
1508 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1509 nfsi->layout = new;
1510 return new;
1511 } else if (new != NULL)
1512 pnfs_free_layout_hdr(new);
1513out_existing:
1514 pnfs_get_layout_hdr(nfsi->layout);
1515 return nfsi->layout;
1516}
1517
1518/*
1519 * iomode matching rules:
1520 * iomode lseg strict match
1521 * iomode
1522 * ----- ----- ------ -----
1523 * ANY READ N/A true
1524 * ANY RW N/A true
1525 * RW READ N/A false
1526 * RW RW N/A true
1527 * READ READ N/A true
1528 * READ RW true false
1529 * READ RW false true
1530 */
1531static bool
1532pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1533 const struct pnfs_layout_range *range,
1534 bool strict_iomode)
1535{
1536 struct pnfs_layout_range range1;
1537
1538 if ((range->iomode == IOMODE_RW &&
1539 ls_range->iomode != IOMODE_RW) ||
1540 (range->iomode != ls_range->iomode &&
1541 strict_iomode) ||
1542 !pnfs_lseg_range_intersecting(ls_range, range))
1543 return 0;
1544
1545 /* range1 covers only the first byte in the range */
1546 range1 = *range;
1547 range1.length = 1;
1548 return pnfs_lseg_range_contained(ls_range, &range1);
1549}
1550
1551/*
1552 * lookup range in layout
1553 */
1554static struct pnfs_layout_segment *
1555pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1556 struct pnfs_layout_range *range,
1557 bool strict_iomode)
1558{
1559 struct pnfs_layout_segment *lseg, *ret = NULL;
1560
1561 dprintk("%s:Begin\n", __func__);
1562
1563 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1564 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1565 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1566 pnfs_lseg_range_match(&lseg->pls_range, range,
1567 strict_iomode)) {
1568 ret = pnfs_get_lseg(lseg);
1569 break;
1570 }
1571 }
1572
1573 dprintk("%s:Return lseg %p ref %d\n",
1574 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1575 return ret;
1576}
1577
1578/*
1579 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1580 * to the MDS or over pNFS
1581 *
1582 * The nfs_inode read_io and write_io fields are cumulative counters reset
1583 * when there are no layout segments. Note that in pnfs_update_layout iomode
1584 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1585 * WRITE request.
1586 *
1587 * A return of true means use MDS I/O.
1588 *
1589 * From rfc 5661:
1590 * If a file's size is smaller than the file size threshold, data accesses
1591 * SHOULD be sent to the metadata server. If an I/O request has a length that
1592 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1593 * server. If both file size and I/O size are provided, the client SHOULD
1594 * reach or exceed both thresholds before sending its read or write
1595 * requests to the data server.
1596 */
1597static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1598 struct inode *ino, int iomode)
1599{
1600 struct nfs4_threshold *t = ctx->mdsthreshold;
1601 struct nfs_inode *nfsi = NFS_I(ino);
1602 loff_t fsize = i_size_read(ino);
1603 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1604
1605 if (t == NULL)
1606 return ret;
1607
1608 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1609 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1610
1611 switch (iomode) {
1612 case IOMODE_READ:
1613 if (t->bm & THRESHOLD_RD) {
1614 dprintk("%s fsize %llu\n", __func__, fsize);
1615 size_set = true;
1616 if (fsize < t->rd_sz)
1617 size = true;
1618 }
1619 if (t->bm & THRESHOLD_RD_IO) {
1620 dprintk("%s nfsi->read_io %llu\n", __func__,
1621 nfsi->read_io);
1622 io_set = true;
1623 if (nfsi->read_io < t->rd_io_sz)
1624 io = true;
1625 }
1626 break;
1627 case IOMODE_RW:
1628 if (t->bm & THRESHOLD_WR) {
1629 dprintk("%s fsize %llu\n", __func__, fsize);
1630 size_set = true;
1631 if (fsize < t->wr_sz)
1632 size = true;
1633 }
1634 if (t->bm & THRESHOLD_WR_IO) {
1635 dprintk("%s nfsi->write_io %llu\n", __func__,
1636 nfsi->write_io);
1637 io_set = true;
1638 if (nfsi->write_io < t->wr_io_sz)
1639 io = true;
1640 }
1641 break;
1642 }
1643 if (size_set && io_set) {
1644 if (size && io)
1645 ret = true;
1646 } else if (size || io)
1647 ret = true;
1648
1649 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1650 return ret;
1651}
1652
1653static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1654{
1655 /*
1656 * send layoutcommit as it can hold up layoutreturn due to lseg
1657 * reference
1658 */
1659 pnfs_layoutcommit_inode(lo->plh_inode, false);
1660 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1661 nfs_wait_bit_killable,
1662 TASK_UNINTERRUPTIBLE);
1663}
1664
1665static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1666{
1667 unsigned long *bitlock = &lo->plh_flags;
1668
1669 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1670 smp_mb__after_atomic();
1671 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1672}
1673
1674/*
1675 * Layout segment is retreived from the server if not cached.
1676 * The appropriate layout segment is referenced and returned to the caller.
1677 */
1678struct pnfs_layout_segment *
1679pnfs_update_layout(struct inode *ino,
1680 struct nfs_open_context *ctx,
1681 loff_t pos,
1682 u64 count,
1683 enum pnfs_iomode iomode,
1684 bool strict_iomode,
1685 gfp_t gfp_flags)
1686{
1687 struct pnfs_layout_range arg = {
1688 .iomode = iomode,
1689 .offset = pos,
1690 .length = count,
1691 };
1692 unsigned pg_offset;
1693 struct nfs_server *server = NFS_SERVER(ino);
1694 struct nfs_client *clp = server->nfs_client;
1695 struct pnfs_layout_hdr *lo = NULL;
1696 struct pnfs_layout_segment *lseg = NULL;
1697 nfs4_stateid stateid;
1698 long timeout = 0;
1699 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1700 bool first;
1701
1702 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1703 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1704 PNFS_UPDATE_LAYOUT_NO_PNFS);
1705 goto out;
1706 }
1707
1708 if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1709 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1710 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1711 goto out;
1712 }
1713
1714 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1715 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1716 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1717 goto out;
1718 }
1719
1720lookup_again:
1721 nfs4_client_recover_expired_lease(clp);
1722 first = false;
1723 spin_lock(&ino->i_lock);
1724 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1725 if (lo == NULL) {
1726 spin_unlock(&ino->i_lock);
1727 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1728 PNFS_UPDATE_LAYOUT_NOMEM);
1729 goto out;
1730 }
1731
1732 /* Do we even need to bother with this? */
1733 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1734 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1735 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1736 dprintk("%s matches recall, use MDS\n", __func__);
1737 goto out_unlock;
1738 }
1739
1740 /* if LAYOUTGET already failed once we don't try again */
1741 if (pnfs_layout_io_test_failed(lo, iomode)) {
1742 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1743 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1744 goto out_unlock;
1745 }
1746
1747 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1748 if (lseg) {
1749 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1750 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1751 goto out_unlock;
1752 }
1753
1754 if (!nfs4_valid_open_stateid(ctx->state)) {
1755 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1756 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1757 goto out_unlock;
1758 }
1759
1760 /*
1761 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1762 * stateid, or it has been invalidated, then we must use the open
1763 * stateid.
1764 */
1765 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
1766
1767 /*
1768 * The first layoutget for the file. Need to serialize per
1769 * RFC 5661 Errata 3208.
1770 */
1771 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1772 &lo->plh_flags)) {
1773 spin_unlock(&ino->i_lock);
1774 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1775 TASK_UNINTERRUPTIBLE);
1776 pnfs_put_layout_hdr(lo);
1777 dprintk("%s retrying\n", __func__);
1778 goto lookup_again;
1779 }
1780
1781 first = true;
1782 if (nfs4_select_rw_stateid(ctx->state,
1783 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
1784 NULL, &stateid, NULL) != 0) {
1785 trace_pnfs_update_layout(ino, pos, count,
1786 iomode, lo, lseg,
1787 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1788 goto out_unlock;
1789 }
1790 } else {
1791 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1792 }
1793
1794 /*
1795 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1796 * for LAYOUTRETURN even if first is true.
1797 */
1798 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1799 spin_unlock(&ino->i_lock);
1800 dprintk("%s wait for layoutreturn\n", __func__);
1801 if (pnfs_prepare_to_retry_layoutget(lo)) {
1802 if (first)
1803 pnfs_clear_first_layoutget(lo);
1804 pnfs_put_layout_hdr(lo);
1805 dprintk("%s retrying\n", __func__);
1806 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1807 lseg, PNFS_UPDATE_LAYOUT_RETRY);
1808 goto lookup_again;
1809 }
1810 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1811 PNFS_UPDATE_LAYOUT_RETURN);
1812 goto out_put_layout_hdr;
1813 }
1814
1815 if (pnfs_layoutgets_blocked(lo)) {
1816 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1817 PNFS_UPDATE_LAYOUT_BLOCKED);
1818 goto out_unlock;
1819 }
1820 atomic_inc(&lo->plh_outstanding);
1821 spin_unlock(&ino->i_lock);
1822
1823 if (list_empty(&lo->plh_layouts)) {
1824 /* The lo must be on the clp list if there is any
1825 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1826 */
1827 spin_lock(&clp->cl_lock);
1828 if (list_empty(&lo->plh_layouts))
1829 list_add_tail(&lo->plh_layouts, &server->layouts);
1830 spin_unlock(&clp->cl_lock);
1831 }
1832
1833 pg_offset = arg.offset & ~PAGE_MASK;
1834 if (pg_offset) {
1835 arg.offset -= pg_offset;
1836 arg.length += pg_offset;
1837 }
1838 if (arg.length != NFS4_MAX_UINT64)
1839 arg.length = PAGE_ALIGN(arg.length);
1840
1841 lseg = send_layoutget(lo, ctx, &stateid, &arg, &timeout, gfp_flags);
1842 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1843 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1844 atomic_dec(&lo->plh_outstanding);
1845 if (IS_ERR(lseg)) {
1846 switch(PTR_ERR(lseg)) {
1847 case -EBUSY:
1848 if (time_after(jiffies, giveup))
1849 lseg = NULL;
1850 break;
1851 case -ERECALLCONFLICT:
1852 /* Huh? We hold no layouts, how is there a recall? */
1853 if (first) {
1854 lseg = NULL;
1855 break;
1856 }
1857 /* Destroy the existing layout and start over */
1858 if (time_after(jiffies, giveup))
1859 pnfs_destroy_layout(NFS_I(ino));
1860 /* Fallthrough */
1861 case -EAGAIN:
1862 break;
1863 default:
1864 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
1865 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1866 lseg = NULL;
1867 }
1868 goto out_put_layout_hdr;
1869 }
1870 if (lseg) {
1871 if (first)
1872 pnfs_clear_first_layoutget(lo);
1873 trace_pnfs_update_layout(ino, pos, count,
1874 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
1875 pnfs_put_layout_hdr(lo);
1876 goto lookup_again;
1877 }
1878 } else {
1879 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1880 }
1881
1882out_put_layout_hdr:
1883 if (first)
1884 pnfs_clear_first_layoutget(lo);
1885 pnfs_put_layout_hdr(lo);
1886out:
1887 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1888 "(%s, offset: %llu, length: %llu)\n",
1889 __func__, ino->i_sb->s_id,
1890 (unsigned long long)NFS_FILEID(ino),
1891 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1892 iomode==IOMODE_RW ? "read/write" : "read-only",
1893 (unsigned long long)pos,
1894 (unsigned long long)count);
1895 return lseg;
1896out_unlock:
1897 spin_unlock(&ino->i_lock);
1898 goto out_put_layout_hdr;
1899}
1900EXPORT_SYMBOL_GPL(pnfs_update_layout);
1901
1902static bool
1903pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1904{
1905 switch (range->iomode) {
1906 case IOMODE_READ:
1907 case IOMODE_RW:
1908 break;
1909 default:
1910 return false;
1911 }
1912 if (range->offset == NFS4_MAX_UINT64)
1913 return false;
1914 if (range->length == 0)
1915 return false;
1916 if (range->length != NFS4_MAX_UINT64 &&
1917 range->length > NFS4_MAX_UINT64 - range->offset)
1918 return false;
1919 return true;
1920}
1921
1922struct pnfs_layout_segment *
1923pnfs_layout_process(struct nfs4_layoutget *lgp)
1924{
1925 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1926 struct nfs4_layoutget_res *res = &lgp->res;
1927 struct pnfs_layout_segment *lseg;
1928 struct inode *ino = lo->plh_inode;
1929 LIST_HEAD(free_me);
1930
1931 if (!pnfs_sanity_check_layout_range(&res->range))
1932 return ERR_PTR(-EINVAL);
1933
1934 /* Inject layout blob into I/O device driver */
1935 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1936 if (IS_ERR_OR_NULL(lseg)) {
1937 if (!lseg)
1938 lseg = ERR_PTR(-ENOMEM);
1939
1940 dprintk("%s: Could not allocate layout: error %ld\n",
1941 __func__, PTR_ERR(lseg));
1942 return lseg;
1943 }
1944
1945 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
1946
1947 spin_lock(&ino->i_lock);
1948 if (pnfs_layoutgets_blocked(lo)) {
1949 dprintk("%s forget reply due to state\n", __func__);
1950 goto out_forget;
1951 }
1952
1953 if (!pnfs_layout_is_valid(lo)) {
1954 /* We have a completely new layout */
1955 pnfs_set_layout_stateid(lo, &res->stateid, true);
1956 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1957 /* existing state ID, make sure the sequence number matches. */
1958 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1959 dprintk("%s forget reply due to sequence\n", __func__);
1960 goto out_forget;
1961 }
1962 pnfs_set_layout_stateid(lo, &res->stateid, false);
1963 } else {
1964 /*
1965 * We got an entirely new state ID. Mark all segments for the
1966 * inode invalid, and retry the layoutget
1967 */
1968 pnfs_mark_layout_stateid_invalid(lo, &free_me);
1969 goto out_forget;
1970 }
1971
1972 pnfs_get_lseg(lseg);
1973 pnfs_layout_insert_lseg(lo, lseg, &free_me);
1974
1975
1976 if (res->return_on_close)
1977 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1978
1979 spin_unlock(&ino->i_lock);
1980 pnfs_free_lseg_list(&free_me);
1981 return lseg;
1982
1983out_forget:
1984 spin_unlock(&ino->i_lock);
1985 lseg->pls_layout = lo;
1986 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1987 if (!pnfs_layout_is_valid(lo))
1988 nfs_commit_inode(ino, 0);
1989 return ERR_PTR(-EAGAIN);
1990}
1991
1992/**
1993 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1994 * @lo: pointer to layout header
1995 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1996 * @return_range: describe layout segment ranges to be returned
1997 *
1998 * This function is mainly intended for use by layoutrecall. It attempts
1999 * to free the layout segment immediately, or else to mark it for return
2000 * as soon as its reference count drops to zero.
2001 */
2002int
2003pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2004 struct list_head *tmp_list,
2005 const struct pnfs_layout_range *return_range,
2006 u32 seq)
2007{
2008 struct pnfs_layout_segment *lseg, *next;
2009 int remaining = 0;
2010
2011 dprintk("%s:Begin lo %p\n", __func__, lo);
2012
2013 if (list_empty(&lo->plh_segs))
2014 return 0;
2015
2016 assert_spin_locked(&lo->plh_inode->i_lock);
2017
2018 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2019 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2020 dprintk("%s: marking lseg %p iomode %d "
2021 "offset %llu length %llu\n", __func__,
2022 lseg, lseg->pls_range.iomode,
2023 lseg->pls_range.offset,
2024 lseg->pls_range.length);
2025 if (mark_lseg_invalid(lseg, tmp_list))
2026 continue;
2027 remaining++;
2028 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2029 }
2030
2031 if (remaining)
2032 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2033
2034 return remaining;
2035}
2036
2037void pnfs_error_mark_layout_for_return(struct inode *inode,
2038 struct pnfs_layout_segment *lseg)
2039{
2040 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2041 struct pnfs_layout_range range = {
2042 .iomode = lseg->pls_range.iomode,
2043 .offset = 0,
2044 .length = NFS4_MAX_UINT64,
2045 };
2046 bool return_now = false;
2047
2048 spin_lock(&inode->i_lock);
2049 if (!pnfs_layout_is_valid(lo)) {
2050 spin_unlock(&inode->i_lock);
2051 return;
2052 }
2053 pnfs_set_plh_return_info(lo, range.iomode, 0);
2054 /*
2055 * mark all matching lsegs so that we are sure to have no live
2056 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2057 * for how it works.
2058 */
2059 if (!pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0)) {
2060 nfs4_stateid stateid;
2061 enum pnfs_iomode iomode;
2062
2063 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
2064 spin_unlock(&inode->i_lock);
2065 if (return_now)
2066 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2067 } else {
2068 spin_unlock(&inode->i_lock);
2069 nfs_commit_inode(inode, 0);
2070 }
2071}
2072EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2073
2074void
2075pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2076{
2077 if (pgio->pg_lseg == NULL ||
2078 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2079 return;
2080 pnfs_put_lseg(pgio->pg_lseg);
2081 pgio->pg_lseg = NULL;
2082}
2083EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2084
2085/*
2086 * Check for any intersection between the request and the pgio->pg_lseg,
2087 * and if none, put this pgio->pg_lseg away.
2088 */
2089static void
2090pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2091{
2092 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2093 pnfs_put_lseg(pgio->pg_lseg);
2094 pgio->pg_lseg = NULL;
2095 }
2096}
2097
2098void
2099pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2100{
2101 u64 rd_size = req->wb_bytes;
2102
2103 pnfs_generic_pg_check_layout(pgio);
2104 pnfs_generic_pg_check_range(pgio, req);
2105 if (pgio->pg_lseg == NULL) {
2106 if (pgio->pg_dreq == NULL)
2107 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2108 else
2109 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2110
2111 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2112 req->wb_context,
2113 req_offset(req),
2114 rd_size,
2115 IOMODE_READ,
2116 false,
2117 GFP_KERNEL);
2118 if (IS_ERR(pgio->pg_lseg)) {
2119 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2120 pgio->pg_lseg = NULL;
2121 return;
2122 }
2123 }
2124 /* If no lseg, fall back to read through mds */
2125 if (pgio->pg_lseg == NULL)
2126 nfs_pageio_reset_read_mds(pgio);
2127
2128}
2129EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2130
2131void
2132pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2133 struct nfs_page *req, u64 wb_size)
2134{
2135 pnfs_generic_pg_check_layout(pgio);
2136 pnfs_generic_pg_check_range(pgio, req);
2137 if (pgio->pg_lseg == NULL) {
2138 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2139 req->wb_context,
2140 req_offset(req),
2141 wb_size,
2142 IOMODE_RW,
2143 false,
2144 GFP_NOFS);
2145 if (IS_ERR(pgio->pg_lseg)) {
2146 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2147 pgio->pg_lseg = NULL;
2148 return;
2149 }
2150 }
2151 /* If no lseg, fall back to write through mds */
2152 if (pgio->pg_lseg == NULL)
2153 nfs_pageio_reset_write_mds(pgio);
2154}
2155EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2156
2157void
2158pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2159{
2160 if (desc->pg_lseg) {
2161 pnfs_put_lseg(desc->pg_lseg);
2162 desc->pg_lseg = NULL;
2163 }
2164}
2165EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2166
2167/*
2168 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2169 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2170 */
2171size_t
2172pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2173 struct nfs_page *prev, struct nfs_page *req)
2174{
2175 unsigned int size;
2176 u64 seg_end, req_start, seg_left;
2177
2178 size = nfs_generic_pg_test(pgio, prev, req);
2179 if (!size)
2180 return 0;
2181
2182 /*
2183 * 'size' contains the number of bytes left in the current page (up
2184 * to the original size asked for in @req->wb_bytes).
2185 *
2186 * Calculate how many bytes are left in the layout segment
2187 * and if there are less bytes than 'size', return that instead.
2188 *
2189 * Please also note that 'end_offset' is actually the offset of the
2190 * first byte that lies outside the pnfs_layout_range. FIXME?
2191 *
2192 */
2193 if (pgio->pg_lseg) {
2194 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2195 pgio->pg_lseg->pls_range.length);
2196 req_start = req_offset(req);
2197
2198 /* start of request is past the last byte of this segment */
2199 if (req_start >= seg_end)
2200 return 0;
2201
2202 /* adjust 'size' iff there are fewer bytes left in the
2203 * segment than what nfs_generic_pg_test returned */
2204 seg_left = seg_end - req_start;
2205 if (seg_left < size)
2206 size = (unsigned int)seg_left;
2207 }
2208
2209 return size;
2210}
2211EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2212
2213int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2214{
2215 struct nfs_pageio_descriptor pgio;
2216
2217 /* Resend all requests through the MDS */
2218 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2219 hdr->completion_ops);
2220 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2221 return nfs_pageio_resend(&pgio, hdr);
2222}
2223EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2224
2225static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2226{
2227
2228 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2229 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2230 PNFS_LAYOUTRET_ON_ERROR) {
2231 pnfs_return_layout(hdr->inode);
2232 }
2233 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2234 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2235}
2236
2237/*
2238 * Called by non rpc-based layout drivers
2239 */
2240void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2241{
2242 if (likely(!hdr->pnfs_error)) {
2243 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2244 hdr->mds_offset + hdr->res.count);
2245 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2246 }
2247 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2248 if (unlikely(hdr->pnfs_error))
2249 pnfs_ld_handle_write_error(hdr);
2250 hdr->mds_ops->rpc_release(hdr);
2251}
2252EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2253
2254static void
2255pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2256 struct nfs_pgio_header *hdr)
2257{
2258 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2259
2260 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2261 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2262 nfs_pageio_reset_write_mds(desc);
2263 mirror->pg_recoalesce = 1;
2264 }
2265 hdr->completion_ops->completion(hdr);
2266}
2267
2268static enum pnfs_try_status
2269pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2270 const struct rpc_call_ops *call_ops,
2271 struct pnfs_layout_segment *lseg,
2272 int how)
2273{
2274 struct inode *inode = hdr->inode;
2275 enum pnfs_try_status trypnfs;
2276 struct nfs_server *nfss = NFS_SERVER(inode);
2277
2278 hdr->mds_ops = call_ops;
2279
2280 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2281 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2282 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2283 if (trypnfs != PNFS_NOT_ATTEMPTED)
2284 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2285 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2286 return trypnfs;
2287}
2288
2289static void
2290pnfs_do_write(struct nfs_pageio_descriptor *desc,
2291 struct nfs_pgio_header *hdr, int how)
2292{
2293 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2294 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2295 enum pnfs_try_status trypnfs;
2296
2297 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2298 switch (trypnfs) {
2299 case PNFS_NOT_ATTEMPTED:
2300 pnfs_write_through_mds(desc, hdr);
2301 case PNFS_ATTEMPTED:
2302 break;
2303 case PNFS_TRY_AGAIN:
2304 /* cleanup hdr and prepare to redo pnfs */
2305 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2306 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2307 list_splice_init(&hdr->pages, &mirror->pg_list);
2308 mirror->pg_recoalesce = 1;
2309 }
2310 hdr->mds_ops->rpc_release(hdr);
2311 }
2312}
2313
2314static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2315{
2316 pnfs_put_lseg(hdr->lseg);
2317 nfs_pgio_header_free(hdr);
2318}
2319
2320int
2321pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2322{
2323 struct nfs_pgio_header *hdr;
2324 int ret;
2325
2326 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2327 if (!hdr) {
2328 desc->pg_error = -ENOMEM;
2329 return desc->pg_error;
2330 }
2331 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2332
2333 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2334 ret = nfs_generic_pgio(desc, hdr);
2335 if (!ret)
2336 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2337
2338 return ret;
2339}
2340EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2341
2342int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2343{
2344 struct nfs_pageio_descriptor pgio;
2345
2346 /* Resend all requests through the MDS */
2347 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2348 return nfs_pageio_resend(&pgio, hdr);
2349}
2350EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2351
2352static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2353{
2354 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2355 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2356 PNFS_LAYOUTRET_ON_ERROR) {
2357 pnfs_return_layout(hdr->inode);
2358 }
2359 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2360 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2361}
2362
2363/*
2364 * Called by non rpc-based layout drivers
2365 */
2366void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2367{
2368 if (likely(!hdr->pnfs_error))
2369 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2370 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2371 if (unlikely(hdr->pnfs_error))
2372 pnfs_ld_handle_read_error(hdr);
2373 hdr->mds_ops->rpc_release(hdr);
2374}
2375EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2376
2377static void
2378pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2379 struct nfs_pgio_header *hdr)
2380{
2381 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2382
2383 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2384 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2385 nfs_pageio_reset_read_mds(desc);
2386 mirror->pg_recoalesce = 1;
2387 }
2388 hdr->completion_ops->completion(hdr);
2389}
2390
2391/*
2392 * Call the appropriate parallel I/O subsystem read function.
2393 */
2394static enum pnfs_try_status
2395pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2396 const struct rpc_call_ops *call_ops,
2397 struct pnfs_layout_segment *lseg)
2398{
2399 struct inode *inode = hdr->inode;
2400 struct nfs_server *nfss = NFS_SERVER(inode);
2401 enum pnfs_try_status trypnfs;
2402
2403 hdr->mds_ops = call_ops;
2404
2405 dprintk("%s: Reading ino:%lu %u@%llu\n",
2406 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2407
2408 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2409 if (trypnfs != PNFS_NOT_ATTEMPTED)
2410 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2411 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2412 return trypnfs;
2413}
2414
2415/* Resend all requests through pnfs. */
2416void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2417{
2418 struct nfs_pageio_descriptor pgio;
2419
2420 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2421 /* Prevent deadlocks with layoutreturn! */
2422 pnfs_put_lseg(hdr->lseg);
2423 hdr->lseg = NULL;
2424
2425 nfs_pageio_init_read(&pgio, hdr->inode, false,
2426 hdr->completion_ops);
2427 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2428 }
2429}
2430EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2431
2432static void
2433pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2434{
2435 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2436 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2437 enum pnfs_try_status trypnfs;
2438
2439 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2440 switch (trypnfs) {
2441 case PNFS_NOT_ATTEMPTED:
2442 pnfs_read_through_mds(desc, hdr);
2443 case PNFS_ATTEMPTED:
2444 break;
2445 case PNFS_TRY_AGAIN:
2446 /* cleanup hdr and prepare to redo pnfs */
2447 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2448 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2449 list_splice_init(&hdr->pages, &mirror->pg_list);
2450 mirror->pg_recoalesce = 1;
2451 }
2452 hdr->mds_ops->rpc_release(hdr);
2453 }
2454}
2455
2456static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2457{
2458 pnfs_put_lseg(hdr->lseg);
2459 nfs_pgio_header_free(hdr);
2460}
2461
2462int
2463pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2464{
2465 struct nfs_pgio_header *hdr;
2466 int ret;
2467
2468 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2469 if (!hdr) {
2470 desc->pg_error = -ENOMEM;
2471 return desc->pg_error;
2472 }
2473 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2474 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2475 ret = nfs_generic_pgio(desc, hdr);
2476 if (!ret)
2477 pnfs_do_read(desc, hdr);
2478 return ret;
2479}
2480EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2481
2482static void pnfs_clear_layoutcommitting(struct inode *inode)
2483{
2484 unsigned long *bitlock = &NFS_I(inode)->flags;
2485
2486 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2487 smp_mb__after_atomic();
2488 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2489}
2490
2491/*
2492 * There can be multiple RW segments.
2493 */
2494static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2495{
2496 struct pnfs_layout_segment *lseg;
2497
2498 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2499 if (lseg->pls_range.iomode == IOMODE_RW &&
2500 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2501 list_add(&lseg->pls_lc_list, listp);
2502 }
2503}
2504
2505static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2506{
2507 struct pnfs_layout_segment *lseg, *tmp;
2508
2509 /* Matched by references in pnfs_set_layoutcommit */
2510 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2511 list_del_init(&lseg->pls_lc_list);
2512 pnfs_put_lseg(lseg);
2513 }
2514
2515 pnfs_clear_layoutcommitting(inode);
2516}
2517
2518void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2519{
2520 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2521}
2522EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2523
2524void
2525pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2526 loff_t end_pos)
2527{
2528 struct nfs_inode *nfsi = NFS_I(inode);
2529 bool mark_as_dirty = false;
2530
2531 spin_lock(&inode->i_lock);
2532 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2533 nfsi->layout->plh_lwb = end_pos;
2534 mark_as_dirty = true;
2535 dprintk("%s: Set layoutcommit for inode %lu ",
2536 __func__, inode->i_ino);
2537 } else if (end_pos > nfsi->layout->plh_lwb)
2538 nfsi->layout->plh_lwb = end_pos;
2539 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2540 /* references matched in nfs4_layoutcommit_release */
2541 pnfs_get_lseg(lseg);
2542 }
2543 spin_unlock(&inode->i_lock);
2544 dprintk("%s: lseg %p end_pos %llu\n",
2545 __func__, lseg, nfsi->layout->plh_lwb);
2546
2547 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2548 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2549 if (mark_as_dirty)
2550 mark_inode_dirty_sync(inode);
2551}
2552EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2553
2554void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2555{
2556 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2557
2558 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2559 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2560 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2561}
2562
2563/*
2564 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2565 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2566 * data to disk to allow the server to recover the data if it crashes.
2567 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2568 * is off, and a COMMIT is sent to a data server, or
2569 * if WRITEs to a data server return NFS_DATA_SYNC.
2570 */
2571int
2572pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2573{
2574 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2575 struct nfs4_layoutcommit_data *data;
2576 struct nfs_inode *nfsi = NFS_I(inode);
2577 loff_t end_pos;
2578 int status;
2579
2580 if (!pnfs_layoutcommit_outstanding(inode))
2581 return 0;
2582
2583 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2584
2585 status = -EAGAIN;
2586 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2587 if (!sync)
2588 goto out;
2589 status = wait_on_bit_lock_action(&nfsi->flags,
2590 NFS_INO_LAYOUTCOMMITTING,
2591 nfs_wait_bit_killable,
2592 TASK_KILLABLE);
2593 if (status)
2594 goto out;
2595 }
2596
2597 status = -ENOMEM;
2598 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2599 data = kzalloc(sizeof(*data), GFP_NOFS);
2600 if (!data)
2601 goto clear_layoutcommitting;
2602
2603 status = 0;
2604 spin_lock(&inode->i_lock);
2605 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2606 goto out_unlock;
2607
2608 INIT_LIST_HEAD(&data->lseg_list);
2609 pnfs_list_write_lseg(inode, &data->lseg_list);
2610
2611 end_pos = nfsi->layout->plh_lwb;
2612
2613 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2614 spin_unlock(&inode->i_lock);
2615
2616 data->args.inode = inode;
2617 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2618 nfs_fattr_init(&data->fattr);
2619 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2620 data->res.fattr = &data->fattr;
2621 if (end_pos != 0)
2622 data->args.lastbytewritten = end_pos - 1;
2623 else
2624 data->args.lastbytewritten = U64_MAX;
2625 data->res.server = NFS_SERVER(inode);
2626
2627 if (ld->prepare_layoutcommit) {
2628 status = ld->prepare_layoutcommit(&data->args);
2629 if (status) {
2630 put_rpccred(data->cred);
2631 spin_lock(&inode->i_lock);
2632 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2633 if (end_pos > nfsi->layout->plh_lwb)
2634 nfsi->layout->plh_lwb = end_pos;
2635 goto out_unlock;
2636 }
2637 }
2638
2639
2640 status = nfs4_proc_layoutcommit(data, sync);
2641out:
2642 if (status)
2643 mark_inode_dirty_sync(inode);
2644 dprintk("<-- %s status %d\n", __func__, status);
2645 return status;
2646out_unlock:
2647 spin_unlock(&inode->i_lock);
2648 kfree(data);
2649clear_layoutcommitting:
2650 pnfs_clear_layoutcommitting(inode);
2651 goto out;
2652}
2653EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2654
2655int
2656pnfs_generic_sync(struct inode *inode, bool datasync)
2657{
2658 return pnfs_layoutcommit_inode(inode, true);
2659}
2660EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2661
2662struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2663{
2664 struct nfs4_threshold *thp;
2665
2666 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2667 if (!thp) {
2668 dprintk("%s mdsthreshold allocation failed\n", __func__);
2669 return NULL;
2670 }
2671 return thp;
2672}
2673
2674#if IS_ENABLED(CONFIG_NFS_V4_2)
2675int
2676pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2677{
2678 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2679 struct nfs_server *server = NFS_SERVER(inode);
2680 struct nfs_inode *nfsi = NFS_I(inode);
2681 struct nfs42_layoutstat_data *data;
2682 struct pnfs_layout_hdr *hdr;
2683 int status = 0;
2684
2685 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2686 goto out;
2687
2688 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2689 goto out;
2690
2691 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2692 goto out;
2693
2694 spin_lock(&inode->i_lock);
2695 if (!NFS_I(inode)->layout) {
2696 spin_unlock(&inode->i_lock);
2697 goto out_clear_layoutstats;
2698 }
2699 hdr = NFS_I(inode)->layout;
2700 pnfs_get_layout_hdr(hdr);
2701 spin_unlock(&inode->i_lock);
2702
2703 data = kzalloc(sizeof(*data), gfp_flags);
2704 if (!data) {
2705 status = -ENOMEM;
2706 goto out_put;
2707 }
2708
2709 data->args.fh = NFS_FH(inode);
2710 data->args.inode = inode;
2711 status = ld->prepare_layoutstats(&data->args);
2712 if (status)
2713 goto out_free;
2714
2715 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2716
2717out:
2718 dprintk("%s returns %d\n", __func__, status);
2719 return status;
2720
2721out_free:
2722 kfree(data);
2723out_put:
2724 pnfs_put_layout_hdr(hdr);
2725out_clear_layoutstats:
2726 smp_mb__before_atomic();
2727 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2728 smp_mb__after_atomic();
2729 goto out;
2730}
2731EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2732#endif
2733
2734unsigned int layoutstats_timer;
2735module_param(layoutstats_timer, uint, 0644);
2736EXPORT_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 <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 (!list_empty(&lo->plh_layouts)) {
272 struct nfs_client *clp = server->nfs_client;
273
274 spin_lock(&clp->cl_lock);
275 list_del_init(&lo->plh_layouts);
276 spin_unlock(&clp->cl_lock);
277 }
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
298 if (!lo)
299 return;
300 inode = lo->plh_inode;
301 pnfs_layoutreturn_before_put_layout_hdr(lo);
302
303 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
304 if (!list_empty(&lo->plh_segs))
305 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
306 pnfs_detach_layout_hdr(lo);
307 spin_unlock(&inode->i_lock);
308 pnfs_free_layout_hdr(lo);
309 }
310}
311
312static void
313pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
314 u32 seq)
315{
316 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
317 iomode = IOMODE_ANY;
318 lo->plh_return_iomode = iomode;
319 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
320 if (seq != 0) {
321 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
322 lo->plh_return_seq = seq;
323 }
324}
325
326static void
327pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
328{
329 struct pnfs_layout_segment *lseg;
330 lo->plh_return_iomode = 0;
331 lo->plh_return_seq = 0;
332 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
333 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
334 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
335 continue;
336 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
337 }
338}
339
340static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
341{
342 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
343 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
344 smp_mb__after_atomic();
345 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
346 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
347}
348
349static void
350pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
351 struct list_head *free_me)
352{
353 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
354 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
355 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
356 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
357 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
358 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
359}
360
361/*
362 * Update the seqid of a layout stateid after receiving
363 * NFS4ERR_OLD_STATEID
364 */
365bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
366 struct pnfs_layout_range *dst_range,
367 struct inode *inode)
368{
369 struct pnfs_layout_hdr *lo;
370 struct pnfs_layout_range range = {
371 .iomode = IOMODE_ANY,
372 .offset = 0,
373 .length = NFS4_MAX_UINT64,
374 };
375 bool ret = false;
376 LIST_HEAD(head);
377 int err;
378
379 spin_lock(&inode->i_lock);
380 lo = NFS_I(inode)->layout;
381 if (lo && pnfs_layout_is_valid(lo) &&
382 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
383 /* Is our call using the most recent seqid? If so, bump it */
384 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
385 nfs4_stateid_seqid_inc(dst);
386 ret = true;
387 goto out;
388 }
389 /* Try to update the seqid to the most recent */
390 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
391 if (err != -EBUSY) {
392 dst->seqid = lo->plh_stateid.seqid;
393 *dst_range = range;
394 ret = true;
395 }
396 }
397out:
398 spin_unlock(&inode->i_lock);
399 pnfs_free_lseg_list(&head);
400 return ret;
401}
402
403/*
404 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
405 *
406 * In order to continue using the pnfs_layout_hdr, a full recovery
407 * is required.
408 * Note that caller must hold inode->i_lock.
409 */
410int
411pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
412 struct list_head *lseg_list)
413{
414 struct pnfs_layout_range range = {
415 .iomode = IOMODE_ANY,
416 .offset = 0,
417 .length = NFS4_MAX_UINT64,
418 };
419 struct pnfs_layout_segment *lseg, *next;
420
421 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
422 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
423 pnfs_clear_lseg_state(lseg, lseg_list);
424 pnfs_clear_layoutreturn_info(lo);
425 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
426 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
427 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
428 pnfs_clear_layoutreturn_waitbit(lo);
429 return !list_empty(&lo->plh_segs);
430}
431
432static int
433pnfs_iomode_to_fail_bit(u32 iomode)
434{
435 return iomode == IOMODE_RW ?
436 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
437}
438
439static void
440pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
441{
442 lo->plh_retry_timestamp = jiffies;
443 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
444 refcount_inc(&lo->plh_refcount);
445}
446
447static void
448pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
449{
450 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
451 refcount_dec(&lo->plh_refcount);
452}
453
454static void
455pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
456{
457 struct inode *inode = lo->plh_inode;
458 struct pnfs_layout_range range = {
459 .iomode = iomode,
460 .offset = 0,
461 .length = NFS4_MAX_UINT64,
462 };
463 LIST_HEAD(head);
464
465 spin_lock(&inode->i_lock);
466 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
467 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
468 spin_unlock(&inode->i_lock);
469 pnfs_free_lseg_list(&head);
470 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
471 iomode == IOMODE_RW ? "RW" : "READ");
472}
473
474static bool
475pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
476{
477 unsigned long start, end;
478 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
479
480 if (test_bit(fail_bit, &lo->plh_flags) == 0)
481 return false;
482 end = jiffies;
483 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
484 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
485 /* It is time to retry the failed layoutgets */
486 pnfs_layout_clear_fail_bit(lo, fail_bit);
487 return false;
488 }
489 return true;
490}
491
492static void
493pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
494 const struct pnfs_layout_range *range,
495 const nfs4_stateid *stateid)
496{
497 INIT_LIST_HEAD(&lseg->pls_list);
498 INIT_LIST_HEAD(&lseg->pls_lc_list);
499 refcount_set(&lseg->pls_refcount, 1);
500 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
501 lseg->pls_layout = lo;
502 lseg->pls_range = *range;
503 lseg->pls_seq = be32_to_cpu(stateid->seqid);
504}
505
506static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
507{
508 if (lseg != NULL) {
509 struct inode *inode = lseg->pls_layout->plh_inode;
510 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
511 }
512}
513
514static void
515pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
516 struct pnfs_layout_segment *lseg)
517{
518 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
519 list_del_init(&lseg->pls_list);
520 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
521 refcount_dec(&lo->plh_refcount);
522 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
523 return;
524 if (list_empty(&lo->plh_segs) &&
525 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
526 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
527 if (atomic_read(&lo->plh_outstanding) == 0)
528 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
529 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
530 }
531}
532
533static bool
534pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
535 struct pnfs_layout_segment *lseg)
536{
537 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
538 pnfs_layout_is_valid(lo)) {
539 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
540 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
541 return true;
542 }
543 return false;
544}
545
546void
547pnfs_put_lseg(struct pnfs_layout_segment *lseg)
548{
549 struct pnfs_layout_hdr *lo;
550 struct inode *inode;
551
552 if (!lseg)
553 return;
554
555 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
556 refcount_read(&lseg->pls_refcount),
557 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
558
559 lo = lseg->pls_layout;
560 inode = lo->plh_inode;
561
562 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
563 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
564 spin_unlock(&inode->i_lock);
565 return;
566 }
567 pnfs_get_layout_hdr(lo);
568 pnfs_layout_remove_lseg(lo, lseg);
569 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
570 lseg = NULL;
571 spin_unlock(&inode->i_lock);
572 pnfs_free_lseg(lseg);
573 pnfs_put_layout_hdr(lo);
574 }
575}
576EXPORT_SYMBOL_GPL(pnfs_put_lseg);
577
578/*
579 * is l2 fully contained in l1?
580 * start1 end1
581 * [----------------------------------)
582 * start2 end2
583 * [----------------)
584 */
585static bool
586pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
587 const struct pnfs_layout_range *l2)
588{
589 u64 start1 = l1->offset;
590 u64 end1 = pnfs_end_offset(start1, l1->length);
591 u64 start2 = l2->offset;
592 u64 end2 = pnfs_end_offset(start2, l2->length);
593
594 return (start1 <= start2) && (end1 >= end2);
595}
596
597static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
598 struct list_head *tmp_list)
599{
600 if (!refcount_dec_and_test(&lseg->pls_refcount))
601 return false;
602 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
603 list_add(&lseg->pls_list, tmp_list);
604 return true;
605}
606
607/* Returns 1 if lseg is removed from list, 0 otherwise */
608static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
609 struct list_head *tmp_list)
610{
611 int rv = 0;
612
613 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
614 /* Remove the reference keeping the lseg in the
615 * list. It will now be removed when all
616 * outstanding io is finished.
617 */
618 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
619 refcount_read(&lseg->pls_refcount));
620 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
621 rv = 1;
622 }
623 return rv;
624}
625
626/*
627 * Compare 2 layout stateid sequence ids, to see which is newer,
628 * taking into account wraparound issues.
629 */
630static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
631{
632 return (s32)(s1 - s2) > 0;
633}
634
635static bool
636pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
637 const struct pnfs_layout_range *recall_range)
638{
639 return (recall_range->iomode == IOMODE_ANY ||
640 lseg_range->iomode == recall_range->iomode) &&
641 pnfs_lseg_range_intersecting(lseg_range, recall_range);
642}
643
644static bool
645pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
646 const struct pnfs_layout_range *recall_range,
647 u32 seq)
648{
649 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
650 return false;
651 if (recall_range == NULL)
652 return true;
653 return pnfs_should_free_range(&lseg->pls_range, recall_range);
654}
655
656/**
657 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
658 * @lo: layout header containing the lsegs
659 * @tmp_list: list head where doomed lsegs should go
660 * @recall_range: optional recall range argument to match (may be NULL)
661 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
662 *
663 * Walk the list of lsegs in the layout header, and tear down any that should
664 * be destroyed. If "recall_range" is specified then the segment must match
665 * that range. If "seq" is non-zero, then only match segments that were handed
666 * out at or before that sequence.
667 *
668 * Returns number of matching invalid lsegs remaining in list after scanning
669 * it and purging them.
670 */
671int
672pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
673 struct list_head *tmp_list,
674 const struct pnfs_layout_range *recall_range,
675 u32 seq)
676{
677 struct pnfs_layout_segment *lseg, *next;
678 int remaining = 0;
679
680 dprintk("%s:Begin lo %p\n", __func__, lo);
681
682 if (list_empty(&lo->plh_segs))
683 return 0;
684 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
685 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
686 dprintk("%s: freeing lseg %p iomode %d seq %u "
687 "offset %llu length %llu\n", __func__,
688 lseg, lseg->pls_range.iomode, lseg->pls_seq,
689 lseg->pls_range.offset, lseg->pls_range.length);
690 if (!mark_lseg_invalid(lseg, tmp_list))
691 remaining++;
692 }
693 dprintk("%s:Return %i\n", __func__, remaining);
694 return remaining;
695}
696
697static void
698pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
699 struct list_head *free_me,
700 const struct pnfs_layout_range *range,
701 u32 seq)
702{
703 struct pnfs_layout_segment *lseg, *next;
704
705 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
706 if (pnfs_match_lseg_recall(lseg, range, seq))
707 list_move_tail(&lseg->pls_list, free_me);
708 }
709}
710
711/* note free_me must contain lsegs from a single layout_hdr */
712void
713pnfs_free_lseg_list(struct list_head *free_me)
714{
715 struct pnfs_layout_segment *lseg, *tmp;
716
717 if (list_empty(free_me))
718 return;
719
720 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
721 list_del(&lseg->pls_list);
722 pnfs_free_lseg(lseg);
723 }
724}
725
726void
727pnfs_destroy_layout(struct nfs_inode *nfsi)
728{
729 struct pnfs_layout_hdr *lo;
730 LIST_HEAD(tmp_list);
731
732 spin_lock(&nfsi->vfs_inode.i_lock);
733 lo = nfsi->layout;
734 if (lo) {
735 pnfs_get_layout_hdr(lo);
736 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
737 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
738 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
739 spin_unlock(&nfsi->vfs_inode.i_lock);
740 pnfs_free_lseg_list(&tmp_list);
741 nfs_commit_inode(&nfsi->vfs_inode, 0);
742 pnfs_put_layout_hdr(lo);
743 } else
744 spin_unlock(&nfsi->vfs_inode.i_lock);
745}
746EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
747
748static bool
749pnfs_layout_add_bulk_destroy_list(struct inode *inode,
750 struct list_head *layout_list)
751{
752 struct pnfs_layout_hdr *lo;
753 bool ret = false;
754
755 spin_lock(&inode->i_lock);
756 lo = NFS_I(inode)->layout;
757 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
758 pnfs_get_layout_hdr(lo);
759 list_add(&lo->plh_bulk_destroy, layout_list);
760 ret = true;
761 }
762 spin_unlock(&inode->i_lock);
763 return ret;
764}
765
766/* Caller must hold rcu_read_lock and clp->cl_lock */
767static int
768pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
769 struct nfs_server *server,
770 struct list_head *layout_list)
771 __must_hold(&clp->cl_lock)
772 __must_hold(RCU)
773{
774 struct pnfs_layout_hdr *lo, *next;
775 struct inode *inode;
776
777 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
778 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
779 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
780 !list_empty(&lo->plh_bulk_destroy))
781 continue;
782 /* If the sb is being destroyed, just bail */
783 if (!nfs_sb_active(server->super))
784 break;
785 inode = igrab(lo->plh_inode);
786 if (inode != NULL) {
787 list_del_init(&lo->plh_layouts);
788 if (pnfs_layout_add_bulk_destroy_list(inode,
789 layout_list))
790 continue;
791 rcu_read_unlock();
792 spin_unlock(&clp->cl_lock);
793 iput(inode);
794 } else {
795 rcu_read_unlock();
796 spin_unlock(&clp->cl_lock);
797 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
798 }
799 nfs_sb_deactive(server->super);
800 spin_lock(&clp->cl_lock);
801 rcu_read_lock();
802 return -EAGAIN;
803 }
804 return 0;
805}
806
807static int
808pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
809 bool is_bulk_recall)
810{
811 struct pnfs_layout_hdr *lo;
812 struct inode *inode;
813 LIST_HEAD(lseg_list);
814 int ret = 0;
815
816 while (!list_empty(layout_list)) {
817 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
818 plh_bulk_destroy);
819 dprintk("%s freeing layout for inode %lu\n", __func__,
820 lo->plh_inode->i_ino);
821 inode = lo->plh_inode;
822
823 pnfs_layoutcommit_inode(inode, false);
824
825 spin_lock(&inode->i_lock);
826 list_del_init(&lo->plh_bulk_destroy);
827 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
828 if (is_bulk_recall)
829 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
830 ret = -EAGAIN;
831 }
832 spin_unlock(&inode->i_lock);
833 pnfs_free_lseg_list(&lseg_list);
834 /* Free all lsegs that are attached to commit buckets */
835 nfs_commit_inode(inode, 0);
836 pnfs_put_layout_hdr(lo);
837 nfs_iput_and_deactive(inode);
838 }
839 return ret;
840}
841
842int
843pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
844 struct nfs_fsid *fsid,
845 bool is_recall)
846{
847 struct nfs_server *server;
848 LIST_HEAD(layout_list);
849
850 spin_lock(&clp->cl_lock);
851 rcu_read_lock();
852restart:
853 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
854 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
855 continue;
856 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
857 server,
858 &layout_list) != 0)
859 goto restart;
860 }
861 rcu_read_unlock();
862 spin_unlock(&clp->cl_lock);
863
864 if (list_empty(&layout_list))
865 return 0;
866 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
867}
868
869int
870pnfs_destroy_layouts_byclid(struct nfs_client *clp,
871 bool is_recall)
872{
873 struct nfs_server *server;
874 LIST_HEAD(layout_list);
875
876 spin_lock(&clp->cl_lock);
877 rcu_read_lock();
878restart:
879 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
880 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
881 server,
882 &layout_list) != 0)
883 goto restart;
884 }
885 rcu_read_unlock();
886 spin_unlock(&clp->cl_lock);
887
888 if (list_empty(&layout_list))
889 return 0;
890 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
891}
892
893/*
894 * Called by the state manger to remove all layouts established under an
895 * expired lease.
896 */
897void
898pnfs_destroy_all_layouts(struct nfs_client *clp)
899{
900 nfs4_deviceid_mark_client_invalid(clp);
901 nfs4_deviceid_purge_client(clp);
902
903 pnfs_destroy_layouts_byclid(clp, false);
904}
905
906/* update lo->plh_stateid with new if is more recent */
907void
908pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
909 bool update_barrier)
910{
911 u32 oldseq, newseq, new_barrier = 0;
912
913 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
914 newseq = be32_to_cpu(new->seqid);
915
916 if (!pnfs_layout_is_valid(lo)) {
917 nfs4_stateid_copy(&lo->plh_stateid, new);
918 lo->plh_barrier = newseq;
919 pnfs_clear_layoutreturn_info(lo);
920 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
921 return;
922 }
923 if (pnfs_seqid_is_newer(newseq, oldseq)) {
924 nfs4_stateid_copy(&lo->plh_stateid, new);
925 /*
926 * Because of wraparound, we want to keep the barrier
927 * "close" to the current seqids.
928 */
929 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
930 }
931 if (update_barrier)
932 new_barrier = be32_to_cpu(new->seqid);
933 else if (new_barrier == 0)
934 return;
935 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
936 lo->plh_barrier = new_barrier;
937}
938
939static bool
940pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
941 const nfs4_stateid *stateid)
942{
943 u32 seqid = be32_to_cpu(stateid->seqid);
944
945 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
946}
947
948/* lget is set to 1 if called from inside send_layoutget call chain */
949static bool
950pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
951{
952 return lo->plh_block_lgets ||
953 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
954}
955
956static struct nfs_server *
957pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
958{
959 struct nfs_server *server;
960
961 if (inode) {
962 server = NFS_SERVER(inode);
963 } else {
964 struct dentry *parent_dir = dget_parent(ctx->dentry);
965 server = NFS_SERVER(parent_dir->d_inode);
966 dput(parent_dir);
967 }
968 return server;
969}
970
971static void nfs4_free_pages(struct page **pages, size_t size)
972{
973 int i;
974
975 if (!pages)
976 return;
977
978 for (i = 0; i < size; i++) {
979 if (!pages[i])
980 break;
981 __free_page(pages[i]);
982 }
983 kfree(pages);
984}
985
986static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
987{
988 struct page **pages;
989 int i;
990
991 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
992 if (!pages) {
993 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
994 return NULL;
995 }
996
997 for (i = 0; i < size; i++) {
998 pages[i] = alloc_page(gfp_flags);
999 if (!pages[i]) {
1000 dprintk("%s: failed to allocate page\n", __func__);
1001 nfs4_free_pages(pages, i);
1002 return NULL;
1003 }
1004 }
1005
1006 return pages;
1007}
1008
1009static struct nfs4_layoutget *
1010pnfs_alloc_init_layoutget_args(struct inode *ino,
1011 struct nfs_open_context *ctx,
1012 const nfs4_stateid *stateid,
1013 const struct pnfs_layout_range *range,
1014 gfp_t gfp_flags)
1015{
1016 struct nfs_server *server = pnfs_find_server(ino, ctx);
1017 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1018 size_t max_pages = max_response_pages(server);
1019 struct nfs4_layoutget *lgp;
1020
1021 dprintk("--> %s\n", __func__);
1022
1023 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1024 if (lgp == NULL)
1025 return NULL;
1026
1027 if (max_reply_sz) {
1028 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1029 if (npages < max_pages)
1030 max_pages = npages;
1031 }
1032
1033 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1034 if (!lgp->args.layout.pages) {
1035 kfree(lgp);
1036 return NULL;
1037 }
1038 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1039 lgp->res.layoutp = &lgp->args.layout;
1040
1041 /* Don't confuse uninitialised result and success */
1042 lgp->res.status = -NFS4ERR_DELAY;
1043
1044 lgp->args.minlength = PAGE_SIZE;
1045 if (lgp->args.minlength > range->length)
1046 lgp->args.minlength = range->length;
1047 if (ino) {
1048 loff_t i_size = i_size_read(ino);
1049
1050 if (range->iomode == IOMODE_READ) {
1051 if (range->offset >= i_size)
1052 lgp->args.minlength = 0;
1053 else if (i_size - range->offset < lgp->args.minlength)
1054 lgp->args.minlength = i_size - range->offset;
1055 }
1056 }
1057 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1058 pnfs_copy_range(&lgp->args.range, range);
1059 lgp->args.type = server->pnfs_curr_ld->id;
1060 lgp->args.inode = ino;
1061 lgp->args.ctx = get_nfs_open_context(ctx);
1062 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1063 lgp->gfp_flags = gfp_flags;
1064 lgp->cred = get_cred(ctx->cred);
1065 return lgp;
1066}
1067
1068void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1069{
1070 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1071
1072 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1073 if (lgp->args.inode)
1074 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout);
1075 put_cred(lgp->cred);
1076 put_nfs_open_context(lgp->args.ctx);
1077 kfree(lgp);
1078}
1079
1080static void pnfs_clear_layoutcommit(struct inode *inode,
1081 struct list_head *head)
1082{
1083 struct nfs_inode *nfsi = NFS_I(inode);
1084 struct pnfs_layout_segment *lseg, *tmp;
1085
1086 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1087 return;
1088 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1089 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1090 continue;
1091 pnfs_lseg_dec_and_remove_zero(lseg, head);
1092 }
1093}
1094
1095void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1096 const nfs4_stateid *arg_stateid,
1097 const struct pnfs_layout_range *range,
1098 const nfs4_stateid *stateid)
1099{
1100 struct inode *inode = lo->plh_inode;
1101 LIST_HEAD(freeme);
1102
1103 spin_lock(&inode->i_lock);
1104 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
1105 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1106 goto out_unlock;
1107 if (stateid) {
1108 u32 seq = be32_to_cpu(arg_stateid->seqid);
1109
1110 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1111 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1112 pnfs_set_layout_stateid(lo, stateid, true);
1113 } else
1114 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1115out_unlock:
1116 pnfs_clear_layoutreturn_waitbit(lo);
1117 spin_unlock(&inode->i_lock);
1118 pnfs_free_lseg_list(&freeme);
1119
1120}
1121
1122static bool
1123pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1124 nfs4_stateid *stateid,
1125 enum pnfs_iomode *iomode)
1126{
1127 /* Serialise LAYOUTGET/LAYOUTRETURN */
1128 if (atomic_read(&lo->plh_outstanding) != 0)
1129 return false;
1130 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1131 return false;
1132 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1133 pnfs_get_layout_hdr(lo);
1134 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1135 if (stateid != NULL) {
1136 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1137 if (lo->plh_return_seq != 0)
1138 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1139 }
1140 if (iomode != NULL)
1141 *iomode = lo->plh_return_iomode;
1142 pnfs_clear_layoutreturn_info(lo);
1143 return true;
1144 }
1145 if (stateid != NULL)
1146 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1147 if (iomode != NULL)
1148 *iomode = IOMODE_ANY;
1149 return true;
1150}
1151
1152static void
1153pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1154 struct pnfs_layout_hdr *lo,
1155 const nfs4_stateid *stateid,
1156 enum pnfs_iomode iomode)
1157{
1158 struct inode *inode = lo->plh_inode;
1159
1160 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1161 args->inode = inode;
1162 args->range.iomode = iomode;
1163 args->range.offset = 0;
1164 args->range.length = NFS4_MAX_UINT64;
1165 args->layout = lo;
1166 nfs4_stateid_copy(&args->stateid, stateid);
1167}
1168
1169static int
1170pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
1171 enum pnfs_iomode iomode, bool sync)
1172{
1173 struct inode *ino = lo->plh_inode;
1174 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1175 struct nfs4_layoutreturn *lrp;
1176 int status = 0;
1177
1178 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1179 if (unlikely(lrp == NULL)) {
1180 status = -ENOMEM;
1181 spin_lock(&ino->i_lock);
1182 pnfs_clear_layoutreturn_waitbit(lo);
1183 spin_unlock(&ino->i_lock);
1184 pnfs_put_layout_hdr(lo);
1185 goto out;
1186 }
1187
1188 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1189 lrp->args.ld_private = &lrp->ld_private;
1190 lrp->clp = NFS_SERVER(ino)->nfs_client;
1191 lrp->cred = lo->plh_lc_cred;
1192 if (ld->prepare_layoutreturn)
1193 ld->prepare_layoutreturn(&lrp->args);
1194
1195 status = nfs4_proc_layoutreturn(lrp, sync);
1196out:
1197 dprintk("<-- %s status: %d\n", __func__, status);
1198 return status;
1199}
1200
1201/* Return true if layoutreturn is needed */
1202static bool
1203pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1204{
1205 struct pnfs_layout_segment *s;
1206 enum pnfs_iomode iomode;
1207 u32 seq;
1208
1209 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1210 return false;
1211
1212 seq = lo->plh_return_seq;
1213 iomode = lo->plh_return_iomode;
1214
1215 /* Defer layoutreturn until all recalled lsegs are done */
1216 list_for_each_entry(s, &lo->plh_segs, pls_list) {
1217 if (seq && pnfs_seqid_is_newer(s->pls_seq, seq))
1218 continue;
1219 if (iomode != IOMODE_ANY && s->pls_range.iomode != iomode)
1220 continue;
1221 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1222 return false;
1223 }
1224
1225 return true;
1226}
1227
1228static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1229{
1230 struct inode *inode= lo->plh_inode;
1231
1232 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1233 return;
1234 spin_lock(&inode->i_lock);
1235 if (pnfs_layout_need_return(lo)) {
1236 nfs4_stateid stateid;
1237 enum pnfs_iomode iomode;
1238 bool send;
1239
1240 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1241 spin_unlock(&inode->i_lock);
1242 if (send) {
1243 /* Send an async layoutreturn so we dont deadlock */
1244 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1245 }
1246 } else
1247 spin_unlock(&inode->i_lock);
1248}
1249
1250/*
1251 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1252 * when the layout segment list is empty.
1253 *
1254 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1255 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1256 * deviceid is marked invalid.
1257 */
1258int
1259_pnfs_return_layout(struct inode *ino)
1260{
1261 struct pnfs_layout_hdr *lo = NULL;
1262 struct nfs_inode *nfsi = NFS_I(ino);
1263 LIST_HEAD(tmp_list);
1264 nfs4_stateid stateid;
1265 int status = 0;
1266 bool send, valid_layout;
1267
1268 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1269
1270 spin_lock(&ino->i_lock);
1271 lo = nfsi->layout;
1272 if (!lo) {
1273 spin_unlock(&ino->i_lock);
1274 dprintk("NFS: %s no layout to return\n", __func__);
1275 goto out;
1276 }
1277 /* Reference matched in nfs4_layoutreturn_release */
1278 pnfs_get_layout_hdr(lo);
1279 /* Is there an outstanding layoutreturn ? */
1280 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1281 spin_unlock(&ino->i_lock);
1282 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1283 TASK_UNINTERRUPTIBLE))
1284 goto out_put_layout_hdr;
1285 spin_lock(&ino->i_lock);
1286 }
1287 valid_layout = pnfs_layout_is_valid(lo);
1288 pnfs_clear_layoutcommit(ino, &tmp_list);
1289 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1290
1291 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1292 struct pnfs_layout_range range = {
1293 .iomode = IOMODE_ANY,
1294 .offset = 0,
1295 .length = NFS4_MAX_UINT64,
1296 };
1297 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1298 }
1299
1300 /* Don't send a LAYOUTRETURN if list was initially empty */
1301 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1302 !valid_layout) {
1303 spin_unlock(&ino->i_lock);
1304 dprintk("NFS: %s no layout segments to return\n", __func__);
1305 goto out_put_layout_hdr;
1306 }
1307
1308 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
1309 spin_unlock(&ino->i_lock);
1310 if (send)
1311 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1312out_put_layout_hdr:
1313 pnfs_free_lseg_list(&tmp_list);
1314 pnfs_put_layout_hdr(lo);
1315out:
1316 dprintk("<-- %s status: %d\n", __func__, status);
1317 return status;
1318}
1319
1320int
1321pnfs_commit_and_return_layout(struct inode *inode)
1322{
1323 struct pnfs_layout_hdr *lo;
1324 int ret;
1325
1326 spin_lock(&inode->i_lock);
1327 lo = NFS_I(inode)->layout;
1328 if (lo == NULL) {
1329 spin_unlock(&inode->i_lock);
1330 return 0;
1331 }
1332 pnfs_get_layout_hdr(lo);
1333 /* Block new layoutgets and read/write to ds */
1334 lo->plh_block_lgets++;
1335 spin_unlock(&inode->i_lock);
1336 filemap_fdatawait(inode->i_mapping);
1337 ret = pnfs_layoutcommit_inode(inode, true);
1338 if (ret == 0)
1339 ret = _pnfs_return_layout(inode);
1340 spin_lock(&inode->i_lock);
1341 lo->plh_block_lgets--;
1342 spin_unlock(&inode->i_lock);
1343 pnfs_put_layout_hdr(lo);
1344 return ret;
1345}
1346
1347bool pnfs_roc(struct inode *ino,
1348 struct nfs4_layoutreturn_args *args,
1349 struct nfs4_layoutreturn_res *res,
1350 const struct cred *cred)
1351{
1352 struct nfs_inode *nfsi = NFS_I(ino);
1353 struct nfs_open_context *ctx;
1354 struct nfs4_state *state;
1355 struct pnfs_layout_hdr *lo;
1356 struct pnfs_layout_segment *lseg, *next;
1357 nfs4_stateid stateid;
1358 enum pnfs_iomode iomode = 0;
1359 bool layoutreturn = false, roc = false;
1360 bool skip_read = false;
1361
1362 if (!nfs_have_layout(ino))
1363 return false;
1364retry:
1365 rcu_read_lock();
1366 spin_lock(&ino->i_lock);
1367 lo = nfsi->layout;
1368 if (!lo || !pnfs_layout_is_valid(lo) ||
1369 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1370 lo = NULL;
1371 goto out_noroc;
1372 }
1373 pnfs_get_layout_hdr(lo);
1374 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1375 spin_unlock(&ino->i_lock);
1376 rcu_read_unlock();
1377 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1378 TASK_UNINTERRUPTIBLE);
1379 pnfs_put_layout_hdr(lo);
1380 goto retry;
1381 }
1382
1383 /* no roc if we hold a delegation */
1384 if (nfs4_check_delegation(ino, FMODE_READ)) {
1385 if (nfs4_check_delegation(ino, FMODE_WRITE))
1386 goto out_noroc;
1387 skip_read = true;
1388 }
1389
1390 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1391 state = ctx->state;
1392 if (state == NULL)
1393 continue;
1394 /* Don't return layout if there is open file state */
1395 if (state->state & FMODE_WRITE)
1396 goto out_noroc;
1397 if (state->state & FMODE_READ)
1398 skip_read = true;
1399 }
1400
1401
1402 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1403 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1404 continue;
1405 /* If we are sending layoutreturn, invalidate all valid lsegs */
1406 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1407 continue;
1408 /*
1409 * Note: mark lseg for return so pnfs_layout_remove_lseg
1410 * doesn't invalidate the layout for us.
1411 */
1412 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1413 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1414 continue;
1415 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1416 }
1417
1418 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1419 goto out_noroc;
1420
1421 /* ROC in two conditions:
1422 * 1. there are ROC lsegs
1423 * 2. we don't send layoutreturn
1424 */
1425 /* lo ref dropped in pnfs_roc_release() */
1426 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1427 /* If the creds don't match, we can't compound the layoutreturn */
1428 if (!layoutreturn || cred != lo->plh_lc_cred)
1429 goto out_noroc;
1430
1431 roc = layoutreturn;
1432 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1433 res->lrs_present = 0;
1434 layoutreturn = false;
1435
1436out_noroc:
1437 spin_unlock(&ino->i_lock);
1438 rcu_read_unlock();
1439 pnfs_layoutcommit_inode(ino, true);
1440 if (roc) {
1441 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1442 if (ld->prepare_layoutreturn)
1443 ld->prepare_layoutreturn(args);
1444 pnfs_put_layout_hdr(lo);
1445 return true;
1446 }
1447 if (layoutreturn)
1448 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
1449 pnfs_put_layout_hdr(lo);
1450 return false;
1451}
1452
1453int pnfs_roc_done(struct rpc_task *task, struct inode *inode,
1454 struct nfs4_layoutreturn_args **argpp,
1455 struct nfs4_layoutreturn_res **respp,
1456 int *ret)
1457{
1458 struct nfs4_layoutreturn_args *arg = *argpp;
1459 int retval = -EAGAIN;
1460
1461 if (!arg)
1462 return 0;
1463 /* Handle Layoutreturn errors */
1464 switch (*ret) {
1465 case 0:
1466 retval = 0;
1467 break;
1468 case -NFS4ERR_NOMATCHING_LAYOUT:
1469 /* Was there an RPC level error? If not, retry */
1470 if (task->tk_rpc_status == 0)
1471 break;
1472 /* If the call was not sent, let caller handle it */
1473 if (!RPC_WAS_SENT(task))
1474 return 0;
1475 /*
1476 * Otherwise, assume the call succeeded and
1477 * that we need to release the layout
1478 */
1479 *ret = 0;
1480 (*respp)->lrs_present = 0;
1481 retval = 0;
1482 break;
1483 case -NFS4ERR_DELAY:
1484 /* Let the caller handle the retry */
1485 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1486 return 0;
1487 case -NFS4ERR_OLD_STATEID:
1488 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1489 &arg->range, inode))
1490 break;
1491 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1492 return -EAGAIN;
1493 }
1494 *argpp = NULL;
1495 *respp = NULL;
1496 return retval;
1497}
1498
1499void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1500 struct nfs4_layoutreturn_res *res,
1501 int ret)
1502{
1503 struct pnfs_layout_hdr *lo = args->layout;
1504 const nfs4_stateid *arg_stateid = NULL;
1505 const nfs4_stateid *res_stateid = NULL;
1506 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1507
1508 switch (ret) {
1509 case -NFS4ERR_NOMATCHING_LAYOUT:
1510 break;
1511 case 0:
1512 if (res->lrs_present)
1513 res_stateid = &res->stateid;
1514 /* Fallthrough */
1515 default:
1516 arg_stateid = &args->stateid;
1517 }
1518 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1519 res_stateid);
1520 if (ld_private && ld_private->ops && ld_private->ops->free)
1521 ld_private->ops->free(ld_private);
1522 pnfs_put_layout_hdr(lo);
1523 trace_nfs4_layoutreturn_on_close(args->inode, 0);
1524}
1525
1526bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1527{
1528 struct nfs_inode *nfsi = NFS_I(ino);
1529 struct pnfs_layout_hdr *lo;
1530 bool sleep = false;
1531
1532 /* we might not have grabbed lo reference. so need to check under
1533 * i_lock */
1534 spin_lock(&ino->i_lock);
1535 lo = nfsi->layout;
1536 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1537 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1538 sleep = true;
1539 }
1540 spin_unlock(&ino->i_lock);
1541 return sleep;
1542}
1543
1544/*
1545 * Compare two layout segments for sorting into layout cache.
1546 * We want to preferentially return RW over RO layouts, so ensure those
1547 * are seen first.
1548 */
1549static s64
1550pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1551 const struct pnfs_layout_range *l2)
1552{
1553 s64 d;
1554
1555 /* high offset > low offset */
1556 d = l1->offset - l2->offset;
1557 if (d)
1558 return d;
1559
1560 /* short length > long length */
1561 d = l2->length - l1->length;
1562 if (d)
1563 return d;
1564
1565 /* read > read/write */
1566 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1567}
1568
1569static bool
1570pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1571 const struct pnfs_layout_range *l2)
1572{
1573 return pnfs_lseg_range_cmp(l1, l2) > 0;
1574}
1575
1576static bool
1577pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1578 struct pnfs_layout_segment *old)
1579{
1580 return false;
1581}
1582
1583void
1584pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1585 struct pnfs_layout_segment *lseg,
1586 bool (*is_after)(const struct pnfs_layout_range *,
1587 const struct pnfs_layout_range *),
1588 bool (*do_merge)(struct pnfs_layout_segment *,
1589 struct pnfs_layout_segment *),
1590 struct list_head *free_me)
1591{
1592 struct pnfs_layout_segment *lp, *tmp;
1593
1594 dprintk("%s:Begin\n", __func__);
1595
1596 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1597 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1598 continue;
1599 if (do_merge(lseg, lp)) {
1600 mark_lseg_invalid(lp, free_me);
1601 continue;
1602 }
1603 if (is_after(&lseg->pls_range, &lp->pls_range))
1604 continue;
1605 list_add_tail(&lseg->pls_list, &lp->pls_list);
1606 dprintk("%s: inserted lseg %p "
1607 "iomode %d offset %llu length %llu before "
1608 "lp %p iomode %d offset %llu length %llu\n",
1609 __func__, lseg, lseg->pls_range.iomode,
1610 lseg->pls_range.offset, lseg->pls_range.length,
1611 lp, lp->pls_range.iomode, lp->pls_range.offset,
1612 lp->pls_range.length);
1613 goto out;
1614 }
1615 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1616 dprintk("%s: inserted lseg %p "
1617 "iomode %d offset %llu length %llu at tail\n",
1618 __func__, lseg, lseg->pls_range.iomode,
1619 lseg->pls_range.offset, lseg->pls_range.length);
1620out:
1621 pnfs_get_layout_hdr(lo);
1622
1623 dprintk("%s:Return\n", __func__);
1624}
1625EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1626
1627static void
1628pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1629 struct pnfs_layout_segment *lseg,
1630 struct list_head *free_me)
1631{
1632 struct inode *inode = lo->plh_inode;
1633 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1634
1635 if (ld->add_lseg != NULL)
1636 ld->add_lseg(lo, lseg, free_me);
1637 else
1638 pnfs_generic_layout_insert_lseg(lo, lseg,
1639 pnfs_lseg_range_is_after,
1640 pnfs_lseg_no_merge,
1641 free_me);
1642}
1643
1644static struct pnfs_layout_hdr *
1645alloc_init_layout_hdr(struct inode *ino,
1646 struct nfs_open_context *ctx,
1647 gfp_t gfp_flags)
1648{
1649 struct pnfs_layout_hdr *lo;
1650
1651 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1652 if (!lo)
1653 return NULL;
1654 refcount_set(&lo->plh_refcount, 1);
1655 INIT_LIST_HEAD(&lo->plh_layouts);
1656 INIT_LIST_HEAD(&lo->plh_segs);
1657 INIT_LIST_HEAD(&lo->plh_return_segs);
1658 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1659 lo->plh_inode = ino;
1660 lo->plh_lc_cred = get_cred(ctx->cred);
1661 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1662 return lo;
1663}
1664
1665static struct pnfs_layout_hdr *
1666pnfs_find_alloc_layout(struct inode *ino,
1667 struct nfs_open_context *ctx,
1668 gfp_t gfp_flags)
1669 __releases(&ino->i_lock)
1670 __acquires(&ino->i_lock)
1671{
1672 struct nfs_inode *nfsi = NFS_I(ino);
1673 struct pnfs_layout_hdr *new = NULL;
1674
1675 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1676
1677 if (nfsi->layout != NULL)
1678 goto out_existing;
1679 spin_unlock(&ino->i_lock);
1680 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1681 spin_lock(&ino->i_lock);
1682
1683 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1684 nfsi->layout = new;
1685 return new;
1686 } else if (new != NULL)
1687 pnfs_free_layout_hdr(new);
1688out_existing:
1689 pnfs_get_layout_hdr(nfsi->layout);
1690 return nfsi->layout;
1691}
1692
1693/*
1694 * iomode matching rules:
1695 * iomode lseg strict match
1696 * iomode
1697 * ----- ----- ------ -----
1698 * ANY READ N/A true
1699 * ANY RW N/A true
1700 * RW READ N/A false
1701 * RW RW N/A true
1702 * READ READ N/A true
1703 * READ RW true false
1704 * READ RW false true
1705 */
1706static bool
1707pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1708 const struct pnfs_layout_range *range,
1709 bool strict_iomode)
1710{
1711 struct pnfs_layout_range range1;
1712
1713 if ((range->iomode == IOMODE_RW &&
1714 ls_range->iomode != IOMODE_RW) ||
1715 (range->iomode != ls_range->iomode &&
1716 strict_iomode) ||
1717 !pnfs_lseg_range_intersecting(ls_range, range))
1718 return false;
1719
1720 /* range1 covers only the first byte in the range */
1721 range1 = *range;
1722 range1.length = 1;
1723 return pnfs_lseg_range_contained(ls_range, &range1);
1724}
1725
1726/*
1727 * lookup range in layout
1728 */
1729static struct pnfs_layout_segment *
1730pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1731 struct pnfs_layout_range *range,
1732 bool strict_iomode)
1733{
1734 struct pnfs_layout_segment *lseg, *ret = NULL;
1735
1736 dprintk("%s:Begin\n", __func__);
1737
1738 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1739 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1740 pnfs_lseg_range_match(&lseg->pls_range, range,
1741 strict_iomode)) {
1742 ret = pnfs_get_lseg(lseg);
1743 break;
1744 }
1745 }
1746
1747 dprintk("%s:Return lseg %p ref %d\n",
1748 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1749 return ret;
1750}
1751
1752/*
1753 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1754 * to the MDS or over pNFS
1755 *
1756 * The nfs_inode read_io and write_io fields are cumulative counters reset
1757 * when there are no layout segments. Note that in pnfs_update_layout iomode
1758 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1759 * WRITE request.
1760 *
1761 * A return of true means use MDS I/O.
1762 *
1763 * From rfc 5661:
1764 * If a file's size is smaller than the file size threshold, data accesses
1765 * SHOULD be sent to the metadata server. If an I/O request has a length that
1766 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1767 * server. If both file size and I/O size are provided, the client SHOULD
1768 * reach or exceed both thresholds before sending its read or write
1769 * requests to the data server.
1770 */
1771static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1772 struct inode *ino, int iomode)
1773{
1774 struct nfs4_threshold *t = ctx->mdsthreshold;
1775 struct nfs_inode *nfsi = NFS_I(ino);
1776 loff_t fsize = i_size_read(ino);
1777 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1778
1779 if (t == NULL)
1780 return ret;
1781
1782 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1783 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1784
1785 switch (iomode) {
1786 case IOMODE_READ:
1787 if (t->bm & THRESHOLD_RD) {
1788 dprintk("%s fsize %llu\n", __func__, fsize);
1789 size_set = true;
1790 if (fsize < t->rd_sz)
1791 size = true;
1792 }
1793 if (t->bm & THRESHOLD_RD_IO) {
1794 dprintk("%s nfsi->read_io %llu\n", __func__,
1795 nfsi->read_io);
1796 io_set = true;
1797 if (nfsi->read_io < t->rd_io_sz)
1798 io = true;
1799 }
1800 break;
1801 case IOMODE_RW:
1802 if (t->bm & THRESHOLD_WR) {
1803 dprintk("%s fsize %llu\n", __func__, fsize);
1804 size_set = true;
1805 if (fsize < t->wr_sz)
1806 size = true;
1807 }
1808 if (t->bm & THRESHOLD_WR_IO) {
1809 dprintk("%s nfsi->write_io %llu\n", __func__,
1810 nfsi->write_io);
1811 io_set = true;
1812 if (nfsi->write_io < t->wr_io_sz)
1813 io = true;
1814 }
1815 break;
1816 }
1817 if (size_set && io_set) {
1818 if (size && io)
1819 ret = true;
1820 } else if (size || io)
1821 ret = true;
1822
1823 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1824 return ret;
1825}
1826
1827static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1828{
1829 /*
1830 * send layoutcommit as it can hold up layoutreturn due to lseg
1831 * reference
1832 */
1833 pnfs_layoutcommit_inode(lo->plh_inode, false);
1834 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1835 nfs_wait_bit_killable,
1836 TASK_KILLABLE);
1837}
1838
1839static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1840{
1841 atomic_inc(&lo->plh_outstanding);
1842}
1843
1844static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1845{
1846 if (atomic_dec_and_test(&lo->plh_outstanding))
1847 wake_up_var(&lo->plh_outstanding);
1848}
1849
1850static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1851{
1852 unsigned long *bitlock = &lo->plh_flags;
1853
1854 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1855 smp_mb__after_atomic();
1856 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1857}
1858
1859static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1860 struct nfs_server *server)
1861{
1862 if (list_empty(&lo->plh_layouts)) {
1863 struct nfs_client *clp = server->nfs_client;
1864
1865 /* The lo must be on the clp list if there is any
1866 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1867 */
1868 spin_lock(&clp->cl_lock);
1869 if (list_empty(&lo->plh_layouts))
1870 list_add_tail(&lo->plh_layouts, &server->layouts);
1871 spin_unlock(&clp->cl_lock);
1872 }
1873}
1874
1875/*
1876 * Layout segment is retreived from the server if not cached.
1877 * The appropriate layout segment is referenced and returned to the caller.
1878 */
1879struct pnfs_layout_segment *
1880pnfs_update_layout(struct inode *ino,
1881 struct nfs_open_context *ctx,
1882 loff_t pos,
1883 u64 count,
1884 enum pnfs_iomode iomode,
1885 bool strict_iomode,
1886 gfp_t gfp_flags)
1887{
1888 struct pnfs_layout_range arg = {
1889 .iomode = iomode,
1890 .offset = pos,
1891 .length = count,
1892 };
1893 unsigned pg_offset;
1894 struct nfs_server *server = NFS_SERVER(ino);
1895 struct nfs_client *clp = server->nfs_client;
1896 struct pnfs_layout_hdr *lo = NULL;
1897 struct pnfs_layout_segment *lseg = NULL;
1898 struct nfs4_layoutget *lgp;
1899 nfs4_stateid stateid;
1900 long timeout = 0;
1901 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1902 bool first;
1903
1904 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1905 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1906 PNFS_UPDATE_LAYOUT_NO_PNFS);
1907 goto out;
1908 }
1909
1910 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1911 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1912 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1913 goto out;
1914 }
1915
1916lookup_again:
1917 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1918 if (IS_ERR(lseg))
1919 goto out;
1920 first = false;
1921 spin_lock(&ino->i_lock);
1922 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1923 if (lo == NULL) {
1924 spin_unlock(&ino->i_lock);
1925 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1926 PNFS_UPDATE_LAYOUT_NOMEM);
1927 goto out;
1928 }
1929
1930 /* Do we even need to bother with this? */
1931 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1932 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1933 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1934 dprintk("%s matches recall, use MDS\n", __func__);
1935 goto out_unlock;
1936 }
1937
1938 /* if LAYOUTGET already failed once we don't try again */
1939 if (pnfs_layout_io_test_failed(lo, iomode)) {
1940 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1941 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1942 goto out_unlock;
1943 }
1944
1945 /*
1946 * If the layout segment list is empty, but there are outstanding
1947 * layoutget calls, then they might be subject to a layoutrecall.
1948 */
1949 if (list_empty(&lo->plh_segs) &&
1950 atomic_read(&lo->plh_outstanding) != 0) {
1951 spin_unlock(&ino->i_lock);
1952 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
1953 !atomic_read(&lo->plh_outstanding)));
1954 if (IS_ERR(lseg))
1955 goto out_put_layout_hdr;
1956 pnfs_put_layout_hdr(lo);
1957 goto lookup_again;
1958 }
1959
1960 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1961 if (lseg) {
1962 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1963 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1964 goto out_unlock;
1965 }
1966
1967 /*
1968 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1969 * stateid, or it has been invalidated, then we must use the open
1970 * stateid.
1971 */
1972 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
1973 int status;
1974
1975 /*
1976 * The first layoutget for the file. Need to serialize per
1977 * RFC 5661 Errata 3208.
1978 */
1979 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1980 &lo->plh_flags)) {
1981 spin_unlock(&ino->i_lock);
1982 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
1983 NFS_LAYOUT_FIRST_LAYOUTGET,
1984 TASK_KILLABLE));
1985 if (IS_ERR(lseg))
1986 goto out_put_layout_hdr;
1987 pnfs_put_layout_hdr(lo);
1988 dprintk("%s retrying\n", __func__);
1989 goto lookup_again;
1990 }
1991
1992 first = true;
1993 status = nfs4_select_rw_stateid(ctx->state,
1994 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
1995 NULL, &stateid, NULL);
1996 if (status != 0) {
1997 lseg = ERR_PTR(status);
1998 trace_pnfs_update_layout(ino, pos, count,
1999 iomode, lo, lseg,
2000 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2001 if (status != -EAGAIN)
2002 goto out_unlock;
2003 spin_unlock(&ino->i_lock);
2004 nfs4_schedule_stateid_recovery(server, ctx->state);
2005 pnfs_clear_first_layoutget(lo);
2006 pnfs_put_layout_hdr(lo);
2007 goto lookup_again;
2008 }
2009 } else {
2010 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2011 }
2012
2013 /*
2014 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
2015 * for LAYOUTRETURN even if first is true.
2016 */
2017 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2018 spin_unlock(&ino->i_lock);
2019 dprintk("%s wait for layoutreturn\n", __func__);
2020 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2021 if (!IS_ERR(lseg)) {
2022 if (first)
2023 pnfs_clear_first_layoutget(lo);
2024 pnfs_put_layout_hdr(lo);
2025 dprintk("%s retrying\n", __func__);
2026 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2027 lseg, PNFS_UPDATE_LAYOUT_RETRY);
2028 goto lookup_again;
2029 }
2030 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2031 PNFS_UPDATE_LAYOUT_RETURN);
2032 goto out_put_layout_hdr;
2033 }
2034
2035 if (pnfs_layoutgets_blocked(lo)) {
2036 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2037 PNFS_UPDATE_LAYOUT_BLOCKED);
2038 goto out_unlock;
2039 }
2040 nfs_layoutget_begin(lo);
2041 spin_unlock(&ino->i_lock);
2042
2043 _add_to_server_list(lo, server);
2044
2045 pg_offset = arg.offset & ~PAGE_MASK;
2046 if (pg_offset) {
2047 arg.offset -= pg_offset;
2048 arg.length += pg_offset;
2049 }
2050 if (arg.length != NFS4_MAX_UINT64)
2051 arg.length = PAGE_ALIGN(arg.length);
2052
2053 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2054 if (!lgp) {
2055 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2056 PNFS_UPDATE_LAYOUT_NOMEM);
2057 nfs_layoutget_end(lo);
2058 goto out_put_layout_hdr;
2059 }
2060
2061 lseg = nfs4_proc_layoutget(lgp, &timeout);
2062 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2063 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2064 nfs_layoutget_end(lo);
2065 if (IS_ERR(lseg)) {
2066 switch(PTR_ERR(lseg)) {
2067 case -EBUSY:
2068 if (time_after(jiffies, giveup))
2069 lseg = NULL;
2070 break;
2071 case -ERECALLCONFLICT:
2072 case -EAGAIN:
2073 break;
2074 default:
2075 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2076 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2077 lseg = NULL;
2078 }
2079 goto out_put_layout_hdr;
2080 }
2081 if (lseg) {
2082 if (first)
2083 pnfs_clear_first_layoutget(lo);
2084 trace_pnfs_update_layout(ino, pos, count,
2085 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2086 pnfs_put_layout_hdr(lo);
2087 goto lookup_again;
2088 }
2089 } else {
2090 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2091 }
2092
2093out_put_layout_hdr:
2094 if (first)
2095 pnfs_clear_first_layoutget(lo);
2096 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2097 PNFS_UPDATE_LAYOUT_EXIT);
2098 pnfs_put_layout_hdr(lo);
2099out:
2100 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2101 "(%s, offset: %llu, length: %llu)\n",
2102 __func__, ino->i_sb->s_id,
2103 (unsigned long long)NFS_FILEID(ino),
2104 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2105 iomode==IOMODE_RW ? "read/write" : "read-only",
2106 (unsigned long long)pos,
2107 (unsigned long long)count);
2108 return lseg;
2109out_unlock:
2110 spin_unlock(&ino->i_lock);
2111 goto out_put_layout_hdr;
2112}
2113EXPORT_SYMBOL_GPL(pnfs_update_layout);
2114
2115static bool
2116pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2117{
2118 switch (range->iomode) {
2119 case IOMODE_READ:
2120 case IOMODE_RW:
2121 break;
2122 default:
2123 return false;
2124 }
2125 if (range->offset == NFS4_MAX_UINT64)
2126 return false;
2127 if (range->length == 0)
2128 return false;
2129 if (range->length != NFS4_MAX_UINT64 &&
2130 range->length > NFS4_MAX_UINT64 - range->offset)
2131 return false;
2132 return true;
2133}
2134
2135static struct pnfs_layout_hdr *
2136_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2137{
2138 struct pnfs_layout_hdr *lo;
2139
2140 spin_lock(&ino->i_lock);
2141 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2142 if (!lo)
2143 goto out_unlock;
2144 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2145 goto out_unlock;
2146 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2147 goto out_unlock;
2148 if (pnfs_layoutgets_blocked(lo))
2149 goto out_unlock;
2150 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2151 goto out_unlock;
2152 nfs_layoutget_begin(lo);
2153 spin_unlock(&ino->i_lock);
2154 _add_to_server_list(lo, NFS_SERVER(ino));
2155 return lo;
2156
2157out_unlock:
2158 spin_unlock(&ino->i_lock);
2159 pnfs_put_layout_hdr(lo);
2160 return NULL;
2161}
2162
2163extern const nfs4_stateid current_stateid;
2164
2165static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2166 struct nfs_open_context *ctx)
2167{
2168 struct inode *ino = data->dentry->d_inode;
2169 struct pnfs_layout_range rng = {
2170 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2171 IOMODE_RW: IOMODE_READ,
2172 .offset = 0,
2173 .length = NFS4_MAX_UINT64,
2174 };
2175 struct nfs4_layoutget *lgp;
2176 struct pnfs_layout_hdr *lo;
2177
2178 /* Heuristic: don't send layoutget if we have cached data */
2179 if (rng.iomode == IOMODE_READ &&
2180 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2181 return;
2182
2183 lo = _pnfs_grab_empty_layout(ino, ctx);
2184 if (!lo)
2185 return;
2186 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid,
2187 &rng, GFP_KERNEL);
2188 if (!lgp) {
2189 pnfs_clear_first_layoutget(lo);
2190 pnfs_put_layout_hdr(lo);
2191 return;
2192 }
2193 data->lgp = lgp;
2194 data->o_arg.lg_args = &lgp->args;
2195 data->o_res.lg_res = &lgp->res;
2196}
2197
2198static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2199 struct nfs_open_context *ctx)
2200{
2201 struct pnfs_layout_range rng = {
2202 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2203 IOMODE_RW: IOMODE_READ,
2204 .offset = 0,
2205 .length = NFS4_MAX_UINT64,
2206 };
2207 struct nfs4_layoutget *lgp;
2208
2209 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid,
2210 &rng, GFP_KERNEL);
2211 if (!lgp)
2212 return;
2213 data->lgp = lgp;
2214 data->o_arg.lg_args = &lgp->args;
2215 data->o_res.lg_res = &lgp->res;
2216}
2217
2218void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2219 struct nfs_open_context *ctx)
2220{
2221 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2222
2223 if (!(pnfs_enabled_sb(server) &&
2224 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2225 return;
2226 /* Could check on max_ops, but currently hardcoded high enough */
2227 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2228 return;
2229 if (data->state)
2230 _lgopen_prepare_attached(data, ctx);
2231 else
2232 _lgopen_prepare_floating(data, ctx);
2233}
2234
2235void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2236 struct nfs_open_context *ctx)
2237{
2238 struct pnfs_layout_hdr *lo;
2239 struct pnfs_layout_segment *lseg;
2240 struct nfs_server *srv = NFS_SERVER(ino);
2241 u32 iomode;
2242
2243 if (!lgp)
2244 return;
2245 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2246 if (lgp->res.status) {
2247 switch (lgp->res.status) {
2248 default:
2249 break;
2250 /*
2251 * Halt lgopen attempts if the server doesn't recognise
2252 * the "current stateid" value, the layout type, or the
2253 * layoutget operation as being valid.
2254 * Also if it complains about too many ops in the compound
2255 * or of the request/reply being too big.
2256 */
2257 case -NFS4ERR_BAD_STATEID:
2258 case -NFS4ERR_NOTSUPP:
2259 case -NFS4ERR_REP_TOO_BIG:
2260 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2261 case -NFS4ERR_REQ_TOO_BIG:
2262 case -NFS4ERR_TOO_MANY_OPS:
2263 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2264 srv->caps &= ~NFS_CAP_LGOPEN;
2265 }
2266 return;
2267 }
2268 if (!lgp->args.inode) {
2269 lo = _pnfs_grab_empty_layout(ino, ctx);
2270 if (!lo)
2271 return;
2272 lgp->args.inode = ino;
2273 } else
2274 lo = NFS_I(lgp->args.inode)->layout;
2275
2276 lseg = pnfs_layout_process(lgp);
2277 if (!IS_ERR(lseg)) {
2278 iomode = lgp->args.range.iomode;
2279 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2280 pnfs_put_lseg(lseg);
2281 }
2282}
2283
2284void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2285{
2286 if (lgp != NULL) {
2287 struct inode *inode = lgp->args.inode;
2288 if (inode) {
2289 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2290 pnfs_clear_first_layoutget(lo);
2291 nfs_layoutget_end(lo);
2292 }
2293 pnfs_layoutget_free(lgp);
2294 }
2295}
2296
2297struct pnfs_layout_segment *
2298pnfs_layout_process(struct nfs4_layoutget *lgp)
2299{
2300 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
2301 struct nfs4_layoutget_res *res = &lgp->res;
2302 struct pnfs_layout_segment *lseg;
2303 struct inode *ino = lo->plh_inode;
2304 LIST_HEAD(free_me);
2305
2306 if (!pnfs_sanity_check_layout_range(&res->range))
2307 return ERR_PTR(-EINVAL);
2308
2309 /* Inject layout blob into I/O device driver */
2310 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2311 if (IS_ERR_OR_NULL(lseg)) {
2312 if (!lseg)
2313 lseg = ERR_PTR(-ENOMEM);
2314
2315 dprintk("%s: Could not allocate layout: error %ld\n",
2316 __func__, PTR_ERR(lseg));
2317 return lseg;
2318 }
2319
2320 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2321
2322 spin_lock(&ino->i_lock);
2323 if (pnfs_layoutgets_blocked(lo)) {
2324 dprintk("%s forget reply due to state\n", __func__);
2325 goto out_forget;
2326 }
2327
2328 if (!pnfs_layout_is_valid(lo)) {
2329 /* We have a completely new layout */
2330 pnfs_set_layout_stateid(lo, &res->stateid, true);
2331 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2332 /* existing state ID, make sure the sequence number matches. */
2333 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2334 dprintk("%s forget reply due to sequence\n", __func__);
2335 goto out_forget;
2336 }
2337 pnfs_set_layout_stateid(lo, &res->stateid, false);
2338 } else {
2339 /*
2340 * We got an entirely new state ID. Mark all segments for the
2341 * inode invalid, and retry the layoutget
2342 */
2343 pnfs_mark_layout_stateid_invalid(lo, &free_me);
2344 goto out_forget;
2345 }
2346
2347 pnfs_get_lseg(lseg);
2348 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2349
2350
2351 if (res->return_on_close)
2352 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2353
2354 spin_unlock(&ino->i_lock);
2355 pnfs_free_lseg_list(&free_me);
2356 return lseg;
2357
2358out_forget:
2359 spin_unlock(&ino->i_lock);
2360 lseg->pls_layout = lo;
2361 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2362 return ERR_PTR(-EAGAIN);
2363}
2364
2365static int
2366mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg,
2367 struct list_head *tmp_list)
2368{
2369 if (!mark_lseg_invalid(lseg, tmp_list))
2370 return 0;
2371 pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg);
2372 return 1;
2373}
2374
2375/**
2376 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2377 * @lo: pointer to layout header
2378 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2379 * @return_range: describe layout segment ranges to be returned
2380 * @seq: stateid seqid to match
2381 *
2382 * This function is mainly intended for use by layoutrecall. It attempts
2383 * to free the layout segment immediately, or else to mark it for return
2384 * as soon as its reference count drops to zero.
2385 *
2386 * Returns
2387 * - 0: a layoutreturn needs to be scheduled.
2388 * - EBUSY: there are layout segment that are still in use.
2389 * - ENOENT: there are no layout segments that need to be returned.
2390 */
2391int
2392pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2393 struct list_head *tmp_list,
2394 const struct pnfs_layout_range *return_range,
2395 u32 seq)
2396{
2397 struct pnfs_layout_segment *lseg, *next;
2398 int remaining = 0;
2399
2400 dprintk("%s:Begin lo %p\n", __func__, lo);
2401
2402 assert_spin_locked(&lo->plh_inode->i_lock);
2403
2404 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2405 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2406 dprintk("%s: marking lseg %p iomode %d "
2407 "offset %llu length %llu\n", __func__,
2408 lseg, lseg->pls_range.iomode,
2409 lseg->pls_range.offset,
2410 lseg->pls_range.length);
2411 if (mark_lseg_invalid_or_return(lseg, tmp_list))
2412 continue;
2413 remaining++;
2414 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2415 }
2416
2417 if (remaining) {
2418 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2419 return -EBUSY;
2420 }
2421
2422 if (!list_empty(&lo->plh_return_segs)) {
2423 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2424 return 0;
2425 }
2426
2427 return -ENOENT;
2428}
2429
2430void pnfs_error_mark_layout_for_return(struct inode *inode,
2431 struct pnfs_layout_segment *lseg)
2432{
2433 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2434 struct pnfs_layout_range range = {
2435 .iomode = lseg->pls_range.iomode,
2436 .offset = 0,
2437 .length = NFS4_MAX_UINT64,
2438 };
2439 bool return_now = false;
2440
2441 spin_lock(&inode->i_lock);
2442 if (!pnfs_layout_is_valid(lo)) {
2443 spin_unlock(&inode->i_lock);
2444 return;
2445 }
2446 pnfs_set_plh_return_info(lo, range.iomode, 0);
2447 /*
2448 * mark all matching lsegs so that we are sure to have no live
2449 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2450 * for how it works.
2451 */
2452 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) {
2453 nfs4_stateid stateid;
2454 enum pnfs_iomode iomode;
2455
2456 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
2457 spin_unlock(&inode->i_lock);
2458 if (return_now)
2459 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2460 } else {
2461 spin_unlock(&inode->i_lock);
2462 nfs_commit_inode(inode, 0);
2463 }
2464}
2465EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2466
2467void
2468pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2469{
2470 if (pgio->pg_lseg == NULL ||
2471 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2472 return;
2473 pnfs_put_lseg(pgio->pg_lseg);
2474 pgio->pg_lseg = NULL;
2475}
2476EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2477
2478/*
2479 * Check for any intersection between the request and the pgio->pg_lseg,
2480 * and if none, put this pgio->pg_lseg away.
2481 */
2482static void
2483pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2484{
2485 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2486 pnfs_put_lseg(pgio->pg_lseg);
2487 pgio->pg_lseg = NULL;
2488 }
2489}
2490
2491void
2492pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2493{
2494 u64 rd_size = req->wb_bytes;
2495
2496 pnfs_generic_pg_check_layout(pgio);
2497 pnfs_generic_pg_check_range(pgio, req);
2498 if (pgio->pg_lseg == NULL) {
2499 if (pgio->pg_dreq == NULL)
2500 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2501 else
2502 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2503
2504 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2505 nfs_req_openctx(req),
2506 req_offset(req),
2507 rd_size,
2508 IOMODE_READ,
2509 false,
2510 GFP_KERNEL);
2511 if (IS_ERR(pgio->pg_lseg)) {
2512 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2513 pgio->pg_lseg = NULL;
2514 return;
2515 }
2516 }
2517 /* If no lseg, fall back to read through mds */
2518 if (pgio->pg_lseg == NULL)
2519 nfs_pageio_reset_read_mds(pgio);
2520
2521}
2522EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2523
2524void
2525pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2526 struct nfs_page *req, u64 wb_size)
2527{
2528 pnfs_generic_pg_check_layout(pgio);
2529 pnfs_generic_pg_check_range(pgio, req);
2530 if (pgio->pg_lseg == NULL) {
2531 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2532 nfs_req_openctx(req),
2533 req_offset(req),
2534 wb_size,
2535 IOMODE_RW,
2536 false,
2537 GFP_KERNEL);
2538 if (IS_ERR(pgio->pg_lseg)) {
2539 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2540 pgio->pg_lseg = NULL;
2541 return;
2542 }
2543 }
2544 /* If no lseg, fall back to write through mds */
2545 if (pgio->pg_lseg == NULL)
2546 nfs_pageio_reset_write_mds(pgio);
2547}
2548EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2549
2550void
2551pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2552{
2553 if (desc->pg_lseg) {
2554 pnfs_put_lseg(desc->pg_lseg);
2555 desc->pg_lseg = NULL;
2556 }
2557}
2558EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2559
2560/*
2561 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2562 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2563 */
2564size_t
2565pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2566 struct nfs_page *prev, struct nfs_page *req)
2567{
2568 unsigned int size;
2569 u64 seg_end, req_start, seg_left;
2570
2571 size = nfs_generic_pg_test(pgio, prev, req);
2572 if (!size)
2573 return 0;
2574
2575 /*
2576 * 'size' contains the number of bytes left in the current page (up
2577 * to the original size asked for in @req->wb_bytes).
2578 *
2579 * Calculate how many bytes are left in the layout segment
2580 * and if there are less bytes than 'size', return that instead.
2581 *
2582 * Please also note that 'end_offset' is actually the offset of the
2583 * first byte that lies outside the pnfs_layout_range. FIXME?
2584 *
2585 */
2586 if (pgio->pg_lseg) {
2587 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2588 pgio->pg_lseg->pls_range.length);
2589 req_start = req_offset(req);
2590
2591 /* start of request is past the last byte of this segment */
2592 if (req_start >= seg_end)
2593 return 0;
2594
2595 /* adjust 'size' iff there are fewer bytes left in the
2596 * segment than what nfs_generic_pg_test returned */
2597 seg_left = seg_end - req_start;
2598 if (seg_left < size)
2599 size = (unsigned int)seg_left;
2600 }
2601
2602 return size;
2603}
2604EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2605
2606int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2607{
2608 struct nfs_pageio_descriptor pgio;
2609
2610 /* Resend all requests through the MDS */
2611 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2612 hdr->completion_ops);
2613 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2614 return nfs_pageio_resend(&pgio, hdr);
2615}
2616EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2617
2618static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2619{
2620
2621 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2622 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2623 PNFS_LAYOUTRET_ON_ERROR) {
2624 pnfs_return_layout(hdr->inode);
2625 }
2626 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2627 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2628}
2629
2630/*
2631 * Called by non rpc-based layout drivers
2632 */
2633void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2634{
2635 if (likely(!hdr->pnfs_error)) {
2636 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2637 hdr->mds_offset + hdr->res.count);
2638 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2639 }
2640 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2641 if (unlikely(hdr->pnfs_error))
2642 pnfs_ld_handle_write_error(hdr);
2643 hdr->mds_ops->rpc_release(hdr);
2644}
2645EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2646
2647static void
2648pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2649 struct nfs_pgio_header *hdr)
2650{
2651 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2652
2653 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2654 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2655 nfs_pageio_reset_write_mds(desc);
2656 mirror->pg_recoalesce = 1;
2657 }
2658 hdr->completion_ops->completion(hdr);
2659}
2660
2661static enum pnfs_try_status
2662pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2663 const struct rpc_call_ops *call_ops,
2664 struct pnfs_layout_segment *lseg,
2665 int how)
2666{
2667 struct inode *inode = hdr->inode;
2668 enum pnfs_try_status trypnfs;
2669 struct nfs_server *nfss = NFS_SERVER(inode);
2670
2671 hdr->mds_ops = call_ops;
2672
2673 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2674 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2675 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2676 if (trypnfs != PNFS_NOT_ATTEMPTED)
2677 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2678 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2679 return trypnfs;
2680}
2681
2682static void
2683pnfs_do_write(struct nfs_pageio_descriptor *desc,
2684 struct nfs_pgio_header *hdr, int how)
2685{
2686 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2687 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2688 enum pnfs_try_status trypnfs;
2689
2690 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2691 switch (trypnfs) {
2692 case PNFS_NOT_ATTEMPTED:
2693 pnfs_write_through_mds(desc, hdr);
2694 case PNFS_ATTEMPTED:
2695 break;
2696 case PNFS_TRY_AGAIN:
2697 /* cleanup hdr and prepare to redo pnfs */
2698 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2699 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2700 list_splice_init(&hdr->pages, &mirror->pg_list);
2701 mirror->pg_recoalesce = 1;
2702 }
2703 hdr->mds_ops->rpc_release(hdr);
2704 }
2705}
2706
2707static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2708{
2709 pnfs_put_lseg(hdr->lseg);
2710 nfs_pgio_header_free(hdr);
2711}
2712
2713int
2714pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2715{
2716 struct nfs_pgio_header *hdr;
2717 int ret;
2718
2719 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2720 if (!hdr) {
2721 desc->pg_error = -ENOMEM;
2722 return desc->pg_error;
2723 }
2724 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2725
2726 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2727 ret = nfs_generic_pgio(desc, hdr);
2728 if (!ret)
2729 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2730
2731 return ret;
2732}
2733EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2734
2735int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2736{
2737 struct nfs_pageio_descriptor pgio;
2738
2739 /* Resend all requests through the MDS */
2740 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2741 return nfs_pageio_resend(&pgio, hdr);
2742}
2743EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2744
2745static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2746{
2747 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2748 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2749 PNFS_LAYOUTRET_ON_ERROR) {
2750 pnfs_return_layout(hdr->inode);
2751 }
2752 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2753 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2754}
2755
2756/*
2757 * Called by non rpc-based layout drivers
2758 */
2759void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2760{
2761 if (likely(!hdr->pnfs_error))
2762 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2763 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2764 if (unlikely(hdr->pnfs_error))
2765 pnfs_ld_handle_read_error(hdr);
2766 hdr->mds_ops->rpc_release(hdr);
2767}
2768EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2769
2770static void
2771pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2772 struct nfs_pgio_header *hdr)
2773{
2774 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2775
2776 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2777 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2778 nfs_pageio_reset_read_mds(desc);
2779 mirror->pg_recoalesce = 1;
2780 }
2781 hdr->completion_ops->completion(hdr);
2782}
2783
2784/*
2785 * Call the appropriate parallel I/O subsystem read function.
2786 */
2787static enum pnfs_try_status
2788pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2789 const struct rpc_call_ops *call_ops,
2790 struct pnfs_layout_segment *lseg)
2791{
2792 struct inode *inode = hdr->inode;
2793 struct nfs_server *nfss = NFS_SERVER(inode);
2794 enum pnfs_try_status trypnfs;
2795
2796 hdr->mds_ops = call_ops;
2797
2798 dprintk("%s: Reading ino:%lu %u@%llu\n",
2799 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2800
2801 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2802 if (trypnfs != PNFS_NOT_ATTEMPTED)
2803 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2804 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2805 return trypnfs;
2806}
2807
2808/* Resend all requests through pnfs. */
2809void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2810{
2811 struct nfs_pageio_descriptor pgio;
2812
2813 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2814 /* Prevent deadlocks with layoutreturn! */
2815 pnfs_put_lseg(hdr->lseg);
2816 hdr->lseg = NULL;
2817
2818 nfs_pageio_init_read(&pgio, hdr->inode, false,
2819 hdr->completion_ops);
2820 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2821 }
2822}
2823EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2824
2825static void
2826pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2827{
2828 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2829 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2830 enum pnfs_try_status trypnfs;
2831
2832 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2833 switch (trypnfs) {
2834 case PNFS_NOT_ATTEMPTED:
2835 pnfs_read_through_mds(desc, hdr);
2836 case PNFS_ATTEMPTED:
2837 break;
2838 case PNFS_TRY_AGAIN:
2839 /* cleanup hdr and prepare to redo pnfs */
2840 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2841 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2842 list_splice_init(&hdr->pages, &mirror->pg_list);
2843 mirror->pg_recoalesce = 1;
2844 }
2845 hdr->mds_ops->rpc_release(hdr);
2846 }
2847}
2848
2849static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2850{
2851 pnfs_put_lseg(hdr->lseg);
2852 nfs_pgio_header_free(hdr);
2853}
2854
2855int
2856pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2857{
2858 struct nfs_pgio_header *hdr;
2859 int ret;
2860
2861 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2862 if (!hdr) {
2863 desc->pg_error = -ENOMEM;
2864 return desc->pg_error;
2865 }
2866 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2867 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2868 ret = nfs_generic_pgio(desc, hdr);
2869 if (!ret)
2870 pnfs_do_read(desc, hdr);
2871 return ret;
2872}
2873EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2874
2875static void pnfs_clear_layoutcommitting(struct inode *inode)
2876{
2877 unsigned long *bitlock = &NFS_I(inode)->flags;
2878
2879 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2880 smp_mb__after_atomic();
2881 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2882}
2883
2884/*
2885 * There can be multiple RW segments.
2886 */
2887static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2888{
2889 struct pnfs_layout_segment *lseg;
2890
2891 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2892 if (lseg->pls_range.iomode == IOMODE_RW &&
2893 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2894 list_add(&lseg->pls_lc_list, listp);
2895 }
2896}
2897
2898static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2899{
2900 struct pnfs_layout_segment *lseg, *tmp;
2901
2902 /* Matched by references in pnfs_set_layoutcommit */
2903 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2904 list_del_init(&lseg->pls_lc_list);
2905 pnfs_put_lseg(lseg);
2906 }
2907
2908 pnfs_clear_layoutcommitting(inode);
2909}
2910
2911void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2912{
2913 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2914}
2915EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2916
2917void
2918pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2919 loff_t end_pos)
2920{
2921 struct nfs_inode *nfsi = NFS_I(inode);
2922 bool mark_as_dirty = false;
2923
2924 spin_lock(&inode->i_lock);
2925 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2926 nfsi->layout->plh_lwb = end_pos;
2927 mark_as_dirty = true;
2928 dprintk("%s: Set layoutcommit for inode %lu ",
2929 __func__, inode->i_ino);
2930 } else if (end_pos > nfsi->layout->plh_lwb)
2931 nfsi->layout->plh_lwb = end_pos;
2932 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2933 /* references matched in nfs4_layoutcommit_release */
2934 pnfs_get_lseg(lseg);
2935 }
2936 spin_unlock(&inode->i_lock);
2937 dprintk("%s: lseg %p end_pos %llu\n",
2938 __func__, lseg, nfsi->layout->plh_lwb);
2939
2940 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2941 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2942 if (mark_as_dirty)
2943 mark_inode_dirty_sync(inode);
2944}
2945EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2946
2947void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2948{
2949 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2950
2951 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2952 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2953 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2954}
2955
2956/*
2957 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2958 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2959 * data to disk to allow the server to recover the data if it crashes.
2960 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2961 * is off, and a COMMIT is sent to a data server, or
2962 * if WRITEs to a data server return NFS_DATA_SYNC.
2963 */
2964int
2965pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2966{
2967 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2968 struct nfs4_layoutcommit_data *data;
2969 struct nfs_inode *nfsi = NFS_I(inode);
2970 loff_t end_pos;
2971 int status;
2972
2973 if (!pnfs_layoutcommit_outstanding(inode))
2974 return 0;
2975
2976 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2977
2978 status = -EAGAIN;
2979 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2980 if (!sync)
2981 goto out;
2982 status = wait_on_bit_lock_action(&nfsi->flags,
2983 NFS_INO_LAYOUTCOMMITTING,
2984 nfs_wait_bit_killable,
2985 TASK_KILLABLE);
2986 if (status)
2987 goto out;
2988 }
2989
2990 status = -ENOMEM;
2991 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2992 data = kzalloc(sizeof(*data), GFP_NOFS);
2993 if (!data)
2994 goto clear_layoutcommitting;
2995
2996 status = 0;
2997 spin_lock(&inode->i_lock);
2998 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2999 goto out_unlock;
3000
3001 INIT_LIST_HEAD(&data->lseg_list);
3002 pnfs_list_write_lseg(inode, &data->lseg_list);
3003
3004 end_pos = nfsi->layout->plh_lwb;
3005
3006 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3007 spin_unlock(&inode->i_lock);
3008
3009 data->args.inode = inode;
3010 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3011 nfs_fattr_init(&data->fattr);
3012 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3013 data->res.fattr = &data->fattr;
3014 if (end_pos != 0)
3015 data->args.lastbytewritten = end_pos - 1;
3016 else
3017 data->args.lastbytewritten = U64_MAX;
3018 data->res.server = NFS_SERVER(inode);
3019
3020 if (ld->prepare_layoutcommit) {
3021 status = ld->prepare_layoutcommit(&data->args);
3022 if (status) {
3023 put_cred(data->cred);
3024 spin_lock(&inode->i_lock);
3025 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3026 if (end_pos > nfsi->layout->plh_lwb)
3027 nfsi->layout->plh_lwb = end_pos;
3028 goto out_unlock;
3029 }
3030 }
3031
3032
3033 status = nfs4_proc_layoutcommit(data, sync);
3034out:
3035 if (status)
3036 mark_inode_dirty_sync(inode);
3037 dprintk("<-- %s status %d\n", __func__, status);
3038 return status;
3039out_unlock:
3040 spin_unlock(&inode->i_lock);
3041 kfree(data);
3042clear_layoutcommitting:
3043 pnfs_clear_layoutcommitting(inode);
3044 goto out;
3045}
3046EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3047
3048int
3049pnfs_generic_sync(struct inode *inode, bool datasync)
3050{
3051 return pnfs_layoutcommit_inode(inode, true);
3052}
3053EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3054
3055struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3056{
3057 struct nfs4_threshold *thp;
3058
3059 thp = kzalloc(sizeof(*thp), GFP_NOFS);
3060 if (!thp) {
3061 dprintk("%s mdsthreshold allocation failed\n", __func__);
3062 return NULL;
3063 }
3064 return thp;
3065}
3066
3067#if IS_ENABLED(CONFIG_NFS_V4_2)
3068int
3069pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3070{
3071 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3072 struct nfs_server *server = NFS_SERVER(inode);
3073 struct nfs_inode *nfsi = NFS_I(inode);
3074 struct nfs42_layoutstat_data *data;
3075 struct pnfs_layout_hdr *hdr;
3076 int status = 0;
3077
3078 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3079 goto out;
3080
3081 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3082 goto out;
3083
3084 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3085 goto out;
3086
3087 spin_lock(&inode->i_lock);
3088 if (!NFS_I(inode)->layout) {
3089 spin_unlock(&inode->i_lock);
3090 goto out_clear_layoutstats;
3091 }
3092 hdr = NFS_I(inode)->layout;
3093 pnfs_get_layout_hdr(hdr);
3094 spin_unlock(&inode->i_lock);
3095
3096 data = kzalloc(sizeof(*data), gfp_flags);
3097 if (!data) {
3098 status = -ENOMEM;
3099 goto out_put;
3100 }
3101
3102 data->args.fh = NFS_FH(inode);
3103 data->args.inode = inode;
3104 status = ld->prepare_layoutstats(&data->args);
3105 if (status)
3106 goto out_free;
3107
3108 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3109
3110out:
3111 dprintk("%s returns %d\n", __func__, status);
3112 return status;
3113
3114out_free:
3115 kfree(data);
3116out_put:
3117 pnfs_put_layout_hdr(hdr);
3118out_clear_layoutstats:
3119 smp_mb__before_atomic();
3120 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3121 smp_mb__after_atomic();
3122 goto out;
3123}
3124EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3125#endif
3126
3127unsigned int layoutstats_timer;
3128module_param(layoutstats_timer, uint, 0644);
3129EXPORT_SYMBOL_GPL(layoutstats_timer);