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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 "internal.h"
34#include "pnfs.h"
35#include "iostat.h"
36#include "nfs4trace.h"
37#include "delegation.h"
38#include "nfs42.h"
39
40#define NFSDBG_FACILITY NFSDBG_PNFS
41#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
42
43/* Locking:
44 *
45 * pnfs_spinlock:
46 * protects pnfs_modules_tbl.
47 */
48static DEFINE_SPINLOCK(pnfs_spinlock);
49
50/*
51 * pnfs_modules_tbl holds all pnfs modules
52 */
53static LIST_HEAD(pnfs_modules_tbl);
54
55static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
56
57/* Return the registered pnfs layout driver module matching given id */
58static struct pnfs_layoutdriver_type *
59find_pnfs_driver_locked(u32 id)
60{
61 struct pnfs_layoutdriver_type *local;
62
63 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
64 if (local->id == id)
65 goto out;
66 local = NULL;
67out:
68 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
69 return local;
70}
71
72static struct pnfs_layoutdriver_type *
73find_pnfs_driver(u32 id)
74{
75 struct pnfs_layoutdriver_type *local;
76
77 spin_lock(&pnfs_spinlock);
78 local = find_pnfs_driver_locked(id);
79 if (local != NULL && !try_module_get(local->owner)) {
80 dprintk("%s: Could not grab reference on module\n", __func__);
81 local = NULL;
82 }
83 spin_unlock(&pnfs_spinlock);
84 return local;
85}
86
87void
88unset_pnfs_layoutdriver(struct nfs_server *nfss)
89{
90 if (nfss->pnfs_curr_ld) {
91 if (nfss->pnfs_curr_ld->clear_layoutdriver)
92 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
93 /* Decrement the MDS count. Purge the deviceid cache if zero */
94 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
95 nfs4_deviceid_purge_client(nfss->nfs_client);
96 module_put(nfss->pnfs_curr_ld->owner);
97 }
98 nfss->pnfs_curr_ld = NULL;
99}
100
101/*
102 * Try to set the server's pnfs module to the pnfs layout type specified by id.
103 * Currently only one pNFS layout driver per filesystem is supported.
104 *
105 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
106 */
107void
108set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
109 u32 id)
110{
111 struct pnfs_layoutdriver_type *ld_type = NULL;
112
113 if (id == 0)
114 goto out_no_driver;
115 if (!(server->nfs_client->cl_exchange_flags &
116 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
117 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
118 __func__, id, server->nfs_client->cl_exchange_flags);
119 goto out_no_driver;
120 }
121 ld_type = find_pnfs_driver(id);
122 if (!ld_type) {
123 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
124 ld_type = find_pnfs_driver(id);
125 if (!ld_type) {
126 dprintk("%s: No pNFS module found for %u.\n",
127 __func__, id);
128 goto out_no_driver;
129 }
130 }
131 server->pnfs_curr_ld = ld_type;
132 if (ld_type->set_layoutdriver
133 && ld_type->set_layoutdriver(server, mntfh)) {
134 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
135 "driver %u.\n", __func__, id);
136 module_put(ld_type->owner);
137 goto out_no_driver;
138 }
139 /* Bump the MDS count */
140 atomic_inc(&server->nfs_client->cl_mds_count);
141
142 dprintk("%s: pNFS module for %u set\n", __func__, id);
143 return;
144
145out_no_driver:
146 dprintk("%s: Using NFSv4 I/O\n", __func__);
147 server->pnfs_curr_ld = NULL;
148}
149
150int
151pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
152{
153 int status = -EINVAL;
154 struct pnfs_layoutdriver_type *tmp;
155
156 if (ld_type->id == 0) {
157 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
158 return status;
159 }
160 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
161 printk(KERN_ERR "NFS: %s Layout driver must provide "
162 "alloc_lseg and free_lseg.\n", __func__);
163 return status;
164 }
165
166 spin_lock(&pnfs_spinlock);
167 tmp = find_pnfs_driver_locked(ld_type->id);
168 if (!tmp) {
169 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
170 status = 0;
171 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
172 ld_type->name);
173 } else {
174 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
175 __func__, ld_type->id);
176 }
177 spin_unlock(&pnfs_spinlock);
178
179 return status;
180}
181EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
182
183void
184pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
185{
186 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
187 spin_lock(&pnfs_spinlock);
188 list_del(&ld_type->pnfs_tblid);
189 spin_unlock(&pnfs_spinlock);
190}
191EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
192
193/*
194 * pNFS client layout cache
195 */
196
197/* Need to hold i_lock if caller does not already hold reference */
198void
199pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
200{
201 atomic_inc(&lo->plh_refcount);
202}
203
204static struct pnfs_layout_hdr *
205pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
206{
207 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
208 return ld->alloc_layout_hdr(ino, gfp_flags);
209}
210
211static void
212pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
213{
214 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
215 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
216
217 if (!list_empty(&lo->plh_layouts)) {
218 struct nfs_client *clp = server->nfs_client;
219
220 spin_lock(&clp->cl_lock);
221 list_del_init(&lo->plh_layouts);
222 spin_unlock(&clp->cl_lock);
223 }
224 put_rpccred(lo->plh_lc_cred);
225 return ld->free_layout_hdr(lo);
226}
227
228static void
229pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
230{
231 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
232 dprintk("%s: freeing layout cache %p\n", __func__, lo);
233 nfsi->layout = NULL;
234 /* Reset MDS Threshold I/O counters */
235 nfsi->write_io = 0;
236 nfsi->read_io = 0;
237}
238
239void
240pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
241{
242 struct inode *inode = lo->plh_inode;
243
244 pnfs_layoutreturn_before_put_layout_hdr(lo);
245
246 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
247 if (!list_empty(&lo->plh_segs))
248 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
249 pnfs_detach_layout_hdr(lo);
250 spin_unlock(&inode->i_lock);
251 pnfs_free_layout_hdr(lo);
252 }
253}
254
255/*
256 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
257 *
258 * In order to continue using the pnfs_layout_hdr, a full recovery
259 * is required.
260 * Note that caller must hold inode->i_lock.
261 */
262static int
263pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
264 struct list_head *lseg_list)
265{
266 struct pnfs_layout_range range = {
267 .iomode = IOMODE_ANY,
268 .offset = 0,
269 .length = NFS4_MAX_UINT64,
270 };
271
272 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
273 return pnfs_mark_matching_lsegs_invalid(lo, lseg_list, &range);
274}
275
276static int
277pnfs_iomode_to_fail_bit(u32 iomode)
278{
279 return iomode == IOMODE_RW ?
280 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
281}
282
283static void
284pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
285{
286 lo->plh_retry_timestamp = jiffies;
287 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
288 atomic_inc(&lo->plh_refcount);
289}
290
291static void
292pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
293{
294 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
295 atomic_dec(&lo->plh_refcount);
296}
297
298static void
299pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
300{
301 struct inode *inode = lo->plh_inode;
302 struct pnfs_layout_range range = {
303 .iomode = iomode,
304 .offset = 0,
305 .length = NFS4_MAX_UINT64,
306 };
307 LIST_HEAD(head);
308
309 spin_lock(&inode->i_lock);
310 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
311 pnfs_mark_matching_lsegs_invalid(lo, &head, &range);
312 spin_unlock(&inode->i_lock);
313 pnfs_free_lseg_list(&head);
314 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
315 iomode == IOMODE_RW ? "RW" : "READ");
316}
317
318static bool
319pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
320{
321 unsigned long start, end;
322 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
323
324 if (test_bit(fail_bit, &lo->plh_flags) == 0)
325 return false;
326 end = jiffies;
327 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
328 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
329 /* It is time to retry the failed layoutgets */
330 pnfs_layout_clear_fail_bit(lo, fail_bit);
331 return false;
332 }
333 return true;
334}
335
336static void
337init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
338{
339 INIT_LIST_HEAD(&lseg->pls_list);
340 INIT_LIST_HEAD(&lseg->pls_lc_list);
341 atomic_set(&lseg->pls_refcount, 1);
342 smp_mb();
343 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
344 lseg->pls_layout = lo;
345}
346
347static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
348{
349 struct inode *ino = lseg->pls_layout->plh_inode;
350
351 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
352}
353
354static void
355pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
356 struct pnfs_layout_segment *lseg)
357{
358 struct inode *inode = lo->plh_inode;
359
360 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
361 list_del_init(&lseg->pls_list);
362 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
363 atomic_dec(&lo->plh_refcount);
364 if (list_empty(&lo->plh_segs))
365 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
366 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
367}
368
369void
370pnfs_put_lseg(struct pnfs_layout_segment *lseg)
371{
372 struct pnfs_layout_hdr *lo;
373 struct inode *inode;
374
375 if (!lseg)
376 return;
377
378 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
379 atomic_read(&lseg->pls_refcount),
380 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
381
382 lo = lseg->pls_layout;
383 inode = lo->plh_inode;
384
385 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
386 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
387 spin_unlock(&inode->i_lock);
388 return;
389 }
390 pnfs_get_layout_hdr(lo);
391 pnfs_layout_remove_lseg(lo, lseg);
392 spin_unlock(&inode->i_lock);
393 pnfs_free_lseg(lseg);
394 pnfs_put_layout_hdr(lo);
395 }
396}
397EXPORT_SYMBOL_GPL(pnfs_put_lseg);
398
399static void pnfs_free_lseg_async_work(struct work_struct *work)
400{
401 struct pnfs_layout_segment *lseg;
402 struct pnfs_layout_hdr *lo;
403
404 lseg = container_of(work, struct pnfs_layout_segment, pls_work);
405 lo = lseg->pls_layout;
406
407 pnfs_free_lseg(lseg);
408 pnfs_put_layout_hdr(lo);
409}
410
411static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
412{
413 INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
414 schedule_work(&lseg->pls_work);
415}
416
417void
418pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
419{
420 if (!lseg)
421 return;
422
423 assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
424
425 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
426 atomic_read(&lseg->pls_refcount),
427 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
428 if (atomic_dec_and_test(&lseg->pls_refcount)) {
429 struct pnfs_layout_hdr *lo = lseg->pls_layout;
430 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
431 return;
432 pnfs_get_layout_hdr(lo);
433 pnfs_layout_remove_lseg(lo, lseg);
434 pnfs_free_lseg_async(lseg);
435 }
436}
437EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
438
439static u64
440end_offset(u64 start, u64 len)
441{
442 u64 end;
443
444 end = start + len;
445 return end >= start ? end : NFS4_MAX_UINT64;
446}
447
448/*
449 * is l2 fully contained in l1?
450 * start1 end1
451 * [----------------------------------)
452 * start2 end2
453 * [----------------)
454 */
455static bool
456pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
457 const struct pnfs_layout_range *l2)
458{
459 u64 start1 = l1->offset;
460 u64 end1 = end_offset(start1, l1->length);
461 u64 start2 = l2->offset;
462 u64 end2 = end_offset(start2, l2->length);
463
464 return (start1 <= start2) && (end1 >= end2);
465}
466
467/*
468 * is l1 and l2 intersecting?
469 * start1 end1
470 * [----------------------------------)
471 * start2 end2
472 * [----------------)
473 */
474static bool
475pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
476 const struct pnfs_layout_range *l2)
477{
478 u64 start1 = l1->offset;
479 u64 end1 = end_offset(start1, l1->length);
480 u64 start2 = l2->offset;
481 u64 end2 = end_offset(start2, l2->length);
482
483 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
484 (end2 == NFS4_MAX_UINT64 || end2 > start1);
485}
486
487static bool
488should_free_lseg(const struct pnfs_layout_range *lseg_range,
489 const struct pnfs_layout_range *recall_range)
490{
491 return (recall_range->iomode == IOMODE_ANY ||
492 lseg_range->iomode == recall_range->iomode) &&
493 pnfs_lseg_range_intersecting(lseg_range, recall_range);
494}
495
496static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
497 struct list_head *tmp_list)
498{
499 if (!atomic_dec_and_test(&lseg->pls_refcount))
500 return false;
501 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
502 list_add(&lseg->pls_list, tmp_list);
503 return true;
504}
505
506/* Returns 1 if lseg is removed from list, 0 otherwise */
507static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
508 struct list_head *tmp_list)
509{
510 int rv = 0;
511
512 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
513 /* Remove the reference keeping the lseg in the
514 * list. It will now be removed when all
515 * outstanding io is finished.
516 */
517 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
518 atomic_read(&lseg->pls_refcount));
519 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
520 rv = 1;
521 }
522 return rv;
523}
524
525/* Returns count of number of matching invalid lsegs remaining in list
526 * after call.
527 */
528int
529pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
530 struct list_head *tmp_list,
531 const struct pnfs_layout_range *recall_range)
532{
533 struct pnfs_layout_segment *lseg, *next;
534 int remaining = 0;
535
536 dprintk("%s:Begin lo %p\n", __func__, lo);
537
538 if (list_empty(&lo->plh_segs))
539 return 0;
540 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
541 if (!recall_range ||
542 should_free_lseg(&lseg->pls_range, recall_range)) {
543 dprintk("%s: freeing lseg %p iomode %d "
544 "offset %llu length %llu\n", __func__,
545 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
546 lseg->pls_range.length);
547 if (!mark_lseg_invalid(lseg, tmp_list))
548 remaining++;
549 }
550 dprintk("%s:Return %i\n", __func__, remaining);
551 return remaining;
552}
553
554/* note free_me must contain lsegs from a single layout_hdr */
555void
556pnfs_free_lseg_list(struct list_head *free_me)
557{
558 struct pnfs_layout_segment *lseg, *tmp;
559
560 if (list_empty(free_me))
561 return;
562
563 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
564 list_del(&lseg->pls_list);
565 pnfs_free_lseg(lseg);
566 }
567}
568
569void
570pnfs_destroy_layout(struct nfs_inode *nfsi)
571{
572 struct pnfs_layout_hdr *lo;
573 LIST_HEAD(tmp_list);
574
575 spin_lock(&nfsi->vfs_inode.i_lock);
576 lo = nfsi->layout;
577 if (lo) {
578 pnfs_get_layout_hdr(lo);
579 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
580 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
581 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
582 spin_unlock(&nfsi->vfs_inode.i_lock);
583 pnfs_free_lseg_list(&tmp_list);
584 pnfs_put_layout_hdr(lo);
585 } else
586 spin_unlock(&nfsi->vfs_inode.i_lock);
587}
588EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
589
590static bool
591pnfs_layout_add_bulk_destroy_list(struct inode *inode,
592 struct list_head *layout_list)
593{
594 struct pnfs_layout_hdr *lo;
595 bool ret = false;
596
597 spin_lock(&inode->i_lock);
598 lo = NFS_I(inode)->layout;
599 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
600 pnfs_get_layout_hdr(lo);
601 list_add(&lo->plh_bulk_destroy, layout_list);
602 ret = true;
603 }
604 spin_unlock(&inode->i_lock);
605 return ret;
606}
607
608/* Caller must hold rcu_read_lock and clp->cl_lock */
609static int
610pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
611 struct nfs_server *server,
612 struct list_head *layout_list)
613{
614 struct pnfs_layout_hdr *lo, *next;
615 struct inode *inode;
616
617 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
618 inode = igrab(lo->plh_inode);
619 if (inode == NULL)
620 continue;
621 list_del_init(&lo->plh_layouts);
622 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
623 continue;
624 rcu_read_unlock();
625 spin_unlock(&clp->cl_lock);
626 iput(inode);
627 spin_lock(&clp->cl_lock);
628 rcu_read_lock();
629 return -EAGAIN;
630 }
631 return 0;
632}
633
634static int
635pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
636 bool is_bulk_recall)
637{
638 struct pnfs_layout_hdr *lo;
639 struct inode *inode;
640 LIST_HEAD(lseg_list);
641 int ret = 0;
642
643 while (!list_empty(layout_list)) {
644 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
645 plh_bulk_destroy);
646 dprintk("%s freeing layout for inode %lu\n", __func__,
647 lo->plh_inode->i_ino);
648 inode = lo->plh_inode;
649
650 pnfs_layoutcommit_inode(inode, false);
651
652 spin_lock(&inode->i_lock);
653 list_del_init(&lo->plh_bulk_destroy);
654 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
655 if (is_bulk_recall)
656 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
657 ret = -EAGAIN;
658 }
659 spin_unlock(&inode->i_lock);
660 pnfs_free_lseg_list(&lseg_list);
661 /* Free all lsegs that are attached to commit buckets */
662 nfs_commit_inode(inode, 0);
663 pnfs_put_layout_hdr(lo);
664 iput(inode);
665 }
666 return ret;
667}
668
669int
670pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
671 struct nfs_fsid *fsid,
672 bool is_recall)
673{
674 struct nfs_server *server;
675 LIST_HEAD(layout_list);
676
677 spin_lock(&clp->cl_lock);
678 rcu_read_lock();
679restart:
680 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
681 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
682 continue;
683 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
684 server,
685 &layout_list) != 0)
686 goto restart;
687 }
688 rcu_read_unlock();
689 spin_unlock(&clp->cl_lock);
690
691 if (list_empty(&layout_list))
692 return 0;
693 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
694}
695
696int
697pnfs_destroy_layouts_byclid(struct nfs_client *clp,
698 bool is_recall)
699{
700 struct nfs_server *server;
701 LIST_HEAD(layout_list);
702
703 spin_lock(&clp->cl_lock);
704 rcu_read_lock();
705restart:
706 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
707 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
708 server,
709 &layout_list) != 0)
710 goto restart;
711 }
712 rcu_read_unlock();
713 spin_unlock(&clp->cl_lock);
714
715 if (list_empty(&layout_list))
716 return 0;
717 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
718}
719
720/*
721 * Called by the state manger to remove all layouts established under an
722 * expired lease.
723 */
724void
725pnfs_destroy_all_layouts(struct nfs_client *clp)
726{
727 nfs4_deviceid_mark_client_invalid(clp);
728 nfs4_deviceid_purge_client(clp);
729
730 pnfs_destroy_layouts_byclid(clp, false);
731}
732
733/*
734 * Compare 2 layout stateid sequence ids, to see which is newer,
735 * taking into account wraparound issues.
736 */
737static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
738{
739 return (s32)(s1 - s2) > 0;
740}
741
742/* update lo->plh_stateid with new if is more recent */
743void
744pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
745 bool update_barrier)
746{
747 u32 oldseq, newseq, new_barrier;
748 int empty = list_empty(&lo->plh_segs);
749
750 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
751 newseq = be32_to_cpu(new->seqid);
752 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
753 nfs4_stateid_copy(&lo->plh_stateid, new);
754 if (update_barrier) {
755 new_barrier = be32_to_cpu(new->seqid);
756 } else {
757 /* Because of wraparound, we want to keep the barrier
758 * "close" to the current seqids.
759 */
760 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
761 }
762 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
763 lo->plh_barrier = new_barrier;
764 }
765}
766
767static bool
768pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
769 const nfs4_stateid *stateid)
770{
771 u32 seqid = be32_to_cpu(stateid->seqid);
772
773 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
774}
775
776/* lget is set to 1 if called from inside send_layoutget call chain */
777static bool
778pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
779{
780 return lo->plh_block_lgets ||
781 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
782}
783
784int
785pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
786 const struct pnfs_layout_range *range,
787 struct nfs4_state *open_state)
788{
789 int status = 0;
790
791 dprintk("--> %s\n", __func__);
792 spin_lock(&lo->plh_inode->i_lock);
793 if (pnfs_layoutgets_blocked(lo)) {
794 status = -EAGAIN;
795 } else if (!nfs4_valid_open_stateid(open_state)) {
796 status = -EBADF;
797 } else if (list_empty(&lo->plh_segs) ||
798 test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
799 int seq;
800
801 do {
802 seq = read_seqbegin(&open_state->seqlock);
803 nfs4_stateid_copy(dst, &open_state->stateid);
804 } while (read_seqretry(&open_state->seqlock, seq));
805 } else
806 nfs4_stateid_copy(dst, &lo->plh_stateid);
807 spin_unlock(&lo->plh_inode->i_lock);
808 dprintk("<-- %s\n", __func__);
809 return status;
810}
811
812/*
813* Get layout from server.
814* for now, assume that whole file layouts are requested.
815* arg->offset: 0
816* arg->length: all ones
817*/
818static struct pnfs_layout_segment *
819send_layoutget(struct pnfs_layout_hdr *lo,
820 struct nfs_open_context *ctx,
821 const struct pnfs_layout_range *range,
822 gfp_t gfp_flags)
823{
824 struct inode *ino = lo->plh_inode;
825 struct nfs_server *server = NFS_SERVER(ino);
826 struct nfs4_layoutget *lgp;
827 struct pnfs_layout_segment *lseg;
828 loff_t i_size;
829
830 dprintk("--> %s\n", __func__);
831
832 /*
833 * Synchronously retrieve layout information from server and
834 * store in lseg. If we race with a concurrent seqid morphing
835 * op, then re-send the LAYOUTGET.
836 */
837 do {
838 lgp = kzalloc(sizeof(*lgp), gfp_flags);
839 if (lgp == NULL)
840 return NULL;
841
842 i_size = i_size_read(ino);
843
844 lgp->args.minlength = PAGE_SIZE;
845 if (lgp->args.minlength > range->length)
846 lgp->args.minlength = range->length;
847 if (range->iomode == IOMODE_READ) {
848 if (range->offset >= i_size)
849 lgp->args.minlength = 0;
850 else if (i_size - range->offset < lgp->args.minlength)
851 lgp->args.minlength = i_size - range->offset;
852 }
853 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
854 pnfs_copy_range(&lgp->args.range, range);
855 lgp->args.type = server->pnfs_curr_ld->id;
856 lgp->args.inode = ino;
857 lgp->args.ctx = get_nfs_open_context(ctx);
858 lgp->gfp_flags = gfp_flags;
859 lgp->cred = lo->plh_lc_cred;
860
861 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
862 } while (lseg == ERR_PTR(-EAGAIN));
863
864 if (IS_ERR(lseg) && !nfs_error_is_fatal(PTR_ERR(lseg)))
865 lseg = NULL;
866 else
867 pnfs_layout_clear_fail_bit(lo,
868 pnfs_iomode_to_fail_bit(range->iomode));
869
870 return lseg;
871}
872
873static void pnfs_clear_layoutcommit(struct inode *inode,
874 struct list_head *head)
875{
876 struct nfs_inode *nfsi = NFS_I(inode);
877 struct pnfs_layout_segment *lseg, *tmp;
878
879 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
880 return;
881 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
882 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
883 continue;
884 pnfs_lseg_dec_and_remove_zero(lseg, head);
885 }
886}
887
888void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
889{
890 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
891 smp_mb__after_atomic();
892 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
893 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
894}
895
896static bool
897pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo)
898{
899 if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
900 return false;
901 lo->plh_return_iomode = 0;
902 pnfs_get_layout_hdr(lo);
903 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
904 return true;
905}
906
907static int
908pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
909 enum pnfs_iomode iomode, bool sync)
910{
911 struct inode *ino = lo->plh_inode;
912 struct nfs4_layoutreturn *lrp;
913 int status = 0;
914
915 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
916 if (unlikely(lrp == NULL)) {
917 status = -ENOMEM;
918 spin_lock(&ino->i_lock);
919 pnfs_clear_layoutreturn_waitbit(lo);
920 spin_unlock(&ino->i_lock);
921 pnfs_put_layout_hdr(lo);
922 goto out;
923 }
924
925 nfs4_stateid_copy(&lrp->args.stateid, stateid);
926 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
927 lrp->args.inode = ino;
928 lrp->args.range.iomode = iomode;
929 lrp->args.range.offset = 0;
930 lrp->args.range.length = NFS4_MAX_UINT64;
931 lrp->args.layout = lo;
932 lrp->clp = NFS_SERVER(ino)->nfs_client;
933 lrp->cred = lo->plh_lc_cred;
934
935 status = nfs4_proc_layoutreturn(lrp, sync);
936out:
937 dprintk("<-- %s status: %d\n", __func__, status);
938 return status;
939}
940
941/* Return true if layoutreturn is needed */
942static bool
943pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
944{
945 struct pnfs_layout_segment *s;
946
947 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
948 return false;
949
950 /* Defer layoutreturn until all lsegs are done */
951 list_for_each_entry(s, &lo->plh_segs, pls_list) {
952 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
953 return false;
954 }
955
956 return true;
957}
958
959static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
960{
961 struct inode *inode= lo->plh_inode;
962
963 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
964 return;
965 spin_lock(&inode->i_lock);
966 if (pnfs_layout_need_return(lo)) {
967 nfs4_stateid stateid;
968 enum pnfs_iomode iomode;
969 bool send;
970
971 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
972 iomode = lo->plh_return_iomode;
973 send = pnfs_prepare_layoutreturn(lo);
974 spin_unlock(&inode->i_lock);
975 if (send) {
976 /* Send an async layoutreturn so we dont deadlock */
977 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
978 }
979 } else
980 spin_unlock(&inode->i_lock);
981}
982
983/*
984 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
985 * when the layout segment list is empty.
986 *
987 * Note that a pnfs_layout_hdr can exist with an empty layout segment
988 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
989 * deviceid is marked invalid.
990 */
991int
992_pnfs_return_layout(struct inode *ino)
993{
994 struct pnfs_layout_hdr *lo = NULL;
995 struct nfs_inode *nfsi = NFS_I(ino);
996 LIST_HEAD(tmp_list);
997 nfs4_stateid stateid;
998 int status = 0, empty;
999 bool send;
1000
1001 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1002
1003 spin_lock(&ino->i_lock);
1004 lo = nfsi->layout;
1005 if (!lo) {
1006 spin_unlock(&ino->i_lock);
1007 dprintk("NFS: %s no layout to return\n", __func__);
1008 goto out;
1009 }
1010 nfs4_stateid_copy(&stateid, &nfsi->layout->plh_stateid);
1011 /* Reference matched in nfs4_layoutreturn_release */
1012 pnfs_get_layout_hdr(lo);
1013 empty = list_empty(&lo->plh_segs);
1014 pnfs_clear_layoutcommit(ino, &tmp_list);
1015 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
1016
1017 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1018 struct pnfs_layout_range range = {
1019 .iomode = IOMODE_ANY,
1020 .offset = 0,
1021 .length = NFS4_MAX_UINT64,
1022 };
1023 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1024 }
1025
1026 /* Don't send a LAYOUTRETURN if list was initially empty */
1027 if (empty) {
1028 spin_unlock(&ino->i_lock);
1029 dprintk("NFS: %s no layout segments to return\n", __func__);
1030 goto out_put_layout_hdr;
1031 }
1032
1033 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1034 send = pnfs_prepare_layoutreturn(lo);
1035 spin_unlock(&ino->i_lock);
1036 pnfs_free_lseg_list(&tmp_list);
1037 if (send)
1038 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1039out_put_layout_hdr:
1040 pnfs_put_layout_hdr(lo);
1041out:
1042 dprintk("<-- %s status: %d\n", __func__, status);
1043 return status;
1044}
1045EXPORT_SYMBOL_GPL(_pnfs_return_layout);
1046
1047int
1048pnfs_commit_and_return_layout(struct inode *inode)
1049{
1050 struct pnfs_layout_hdr *lo;
1051 int ret;
1052
1053 spin_lock(&inode->i_lock);
1054 lo = NFS_I(inode)->layout;
1055 if (lo == NULL) {
1056 spin_unlock(&inode->i_lock);
1057 return 0;
1058 }
1059 pnfs_get_layout_hdr(lo);
1060 /* Block new layoutgets and read/write to ds */
1061 lo->plh_block_lgets++;
1062 spin_unlock(&inode->i_lock);
1063 filemap_fdatawait(inode->i_mapping);
1064 ret = pnfs_layoutcommit_inode(inode, true);
1065 if (ret == 0)
1066 ret = _pnfs_return_layout(inode);
1067 spin_lock(&inode->i_lock);
1068 lo->plh_block_lgets--;
1069 spin_unlock(&inode->i_lock);
1070 pnfs_put_layout_hdr(lo);
1071 return ret;
1072}
1073
1074bool pnfs_roc(struct inode *ino)
1075{
1076 struct nfs_inode *nfsi = NFS_I(ino);
1077 struct nfs_open_context *ctx;
1078 struct nfs4_state *state;
1079 struct pnfs_layout_hdr *lo;
1080 struct pnfs_layout_segment *lseg, *tmp;
1081 nfs4_stateid stateid;
1082 LIST_HEAD(tmp_list);
1083 bool found = false, layoutreturn = false, roc = false;
1084
1085 spin_lock(&ino->i_lock);
1086 lo = nfsi->layout;
1087 if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1088 goto out_noroc;
1089
1090 /* no roc if we hold a delegation */
1091 if (nfs4_check_delegation(ino, FMODE_READ))
1092 goto out_noroc;
1093
1094 list_for_each_entry(ctx, &nfsi->open_files, list) {
1095 state = ctx->state;
1096 /* Don't return layout if there is open file state */
1097 if (state != NULL && state->state != 0)
1098 goto out_noroc;
1099 }
1100
1101 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1102 /* always send layoutreturn if being marked so */
1103 if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED,
1104 &lo->plh_flags))
1105 layoutreturn = pnfs_prepare_layoutreturn(lo);
1106
1107 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1108 /* If we are sending layoutreturn, invalidate all valid lsegs */
1109 if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
1110 mark_lseg_invalid(lseg, &tmp_list);
1111 found = true;
1112 }
1113 /* ROC in two conditions:
1114 * 1. there are ROC lsegs
1115 * 2. we don't send layoutreturn
1116 */
1117 if (found && !layoutreturn) {
1118 /* lo ref dropped in pnfs_roc_release() */
1119 pnfs_get_layout_hdr(lo);
1120 roc = true;
1121 }
1122
1123out_noroc:
1124 spin_unlock(&ino->i_lock);
1125 pnfs_free_lseg_list(&tmp_list);
1126 pnfs_layoutcommit_inode(ino, true);
1127 if (layoutreturn)
1128 pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1129 return roc;
1130}
1131
1132void pnfs_roc_release(struct inode *ino)
1133{
1134 struct pnfs_layout_hdr *lo;
1135
1136 spin_lock(&ino->i_lock);
1137 lo = NFS_I(ino)->layout;
1138 pnfs_clear_layoutreturn_waitbit(lo);
1139 if (atomic_dec_and_test(&lo->plh_refcount)) {
1140 pnfs_detach_layout_hdr(lo);
1141 spin_unlock(&ino->i_lock);
1142 pnfs_free_layout_hdr(lo);
1143 } else
1144 spin_unlock(&ino->i_lock);
1145}
1146
1147void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
1148{
1149 struct pnfs_layout_hdr *lo;
1150
1151 spin_lock(&ino->i_lock);
1152 lo = NFS_I(ino)->layout;
1153 pnfs_mark_layout_returned_if_empty(lo);
1154 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
1155 lo->plh_barrier = barrier;
1156 spin_unlock(&ino->i_lock);
1157 trace_nfs4_layoutreturn_on_close(ino, 0);
1158}
1159
1160void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
1161{
1162 struct nfs_inode *nfsi = NFS_I(ino);
1163 struct pnfs_layout_hdr *lo;
1164 u32 current_seqid;
1165
1166 spin_lock(&ino->i_lock);
1167 lo = nfsi->layout;
1168 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
1169
1170 /* Since close does not return a layout stateid for use as
1171 * a barrier, we choose the worst-case barrier.
1172 */
1173 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
1174 spin_unlock(&ino->i_lock);
1175}
1176
1177bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1178{
1179 struct nfs_inode *nfsi = NFS_I(ino);
1180 struct pnfs_layout_hdr *lo;
1181 bool sleep = false;
1182
1183 /* we might not have grabbed lo reference. so need to check under
1184 * i_lock */
1185 spin_lock(&ino->i_lock);
1186 lo = nfsi->layout;
1187 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
1188 sleep = true;
1189 spin_unlock(&ino->i_lock);
1190
1191 if (sleep)
1192 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1193
1194 return sleep;
1195}
1196
1197/*
1198 * Compare two layout segments for sorting into layout cache.
1199 * We want to preferentially return RW over RO layouts, so ensure those
1200 * are seen first.
1201 */
1202static s64
1203pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1204 const struct pnfs_layout_range *l2)
1205{
1206 s64 d;
1207
1208 /* high offset > low offset */
1209 d = l1->offset - l2->offset;
1210 if (d)
1211 return d;
1212
1213 /* short length > long length */
1214 d = l2->length - l1->length;
1215 if (d)
1216 return d;
1217
1218 /* read > read/write */
1219 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1220}
1221
1222static bool
1223pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1224 const struct pnfs_layout_range *l2)
1225{
1226 return pnfs_lseg_range_cmp(l1, l2) > 0;
1227}
1228
1229static bool
1230pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1231 struct pnfs_layout_segment *old)
1232{
1233 return false;
1234}
1235
1236void
1237pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1238 struct pnfs_layout_segment *lseg,
1239 bool (*is_after)(const struct pnfs_layout_range *,
1240 const struct pnfs_layout_range *),
1241 bool (*do_merge)(struct pnfs_layout_segment *,
1242 struct pnfs_layout_segment *),
1243 struct list_head *free_me)
1244{
1245 struct pnfs_layout_segment *lp, *tmp;
1246
1247 dprintk("%s:Begin\n", __func__);
1248
1249 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1250 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1251 continue;
1252 if (do_merge(lseg, lp)) {
1253 mark_lseg_invalid(lp, free_me);
1254 continue;
1255 }
1256 if (is_after(&lseg->pls_range, &lp->pls_range))
1257 continue;
1258 list_add_tail(&lseg->pls_list, &lp->pls_list);
1259 dprintk("%s: inserted lseg %p "
1260 "iomode %d offset %llu length %llu before "
1261 "lp %p iomode %d offset %llu length %llu\n",
1262 __func__, lseg, lseg->pls_range.iomode,
1263 lseg->pls_range.offset, lseg->pls_range.length,
1264 lp, lp->pls_range.iomode, lp->pls_range.offset,
1265 lp->pls_range.length);
1266 goto out;
1267 }
1268 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1269 dprintk("%s: inserted lseg %p "
1270 "iomode %d offset %llu length %llu at tail\n",
1271 __func__, lseg, lseg->pls_range.iomode,
1272 lseg->pls_range.offset, lseg->pls_range.length);
1273out:
1274 pnfs_get_layout_hdr(lo);
1275
1276 dprintk("%s:Return\n", __func__);
1277}
1278EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1279
1280static void
1281pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1282 struct pnfs_layout_segment *lseg,
1283 struct list_head *free_me)
1284{
1285 struct inode *inode = lo->plh_inode;
1286 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1287
1288 if (ld->add_lseg != NULL)
1289 ld->add_lseg(lo, lseg, free_me);
1290 else
1291 pnfs_generic_layout_insert_lseg(lo, lseg,
1292 pnfs_lseg_range_is_after,
1293 pnfs_lseg_no_merge,
1294 free_me);
1295}
1296
1297static struct pnfs_layout_hdr *
1298alloc_init_layout_hdr(struct inode *ino,
1299 struct nfs_open_context *ctx,
1300 gfp_t gfp_flags)
1301{
1302 struct pnfs_layout_hdr *lo;
1303
1304 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1305 if (!lo)
1306 return NULL;
1307 atomic_set(&lo->plh_refcount, 1);
1308 INIT_LIST_HEAD(&lo->plh_layouts);
1309 INIT_LIST_HEAD(&lo->plh_segs);
1310 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1311 lo->plh_inode = ino;
1312 lo->plh_lc_cred = get_rpccred(ctx->cred);
1313 return lo;
1314}
1315
1316static struct pnfs_layout_hdr *
1317pnfs_find_alloc_layout(struct inode *ino,
1318 struct nfs_open_context *ctx,
1319 gfp_t gfp_flags)
1320{
1321 struct nfs_inode *nfsi = NFS_I(ino);
1322 struct pnfs_layout_hdr *new = NULL;
1323
1324 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1325
1326 if (nfsi->layout != NULL)
1327 goto out_existing;
1328 spin_unlock(&ino->i_lock);
1329 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1330 spin_lock(&ino->i_lock);
1331
1332 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1333 nfsi->layout = new;
1334 return new;
1335 } else if (new != NULL)
1336 pnfs_free_layout_hdr(new);
1337out_existing:
1338 pnfs_get_layout_hdr(nfsi->layout);
1339 return nfsi->layout;
1340}
1341
1342/*
1343 * iomode matching rules:
1344 * iomode lseg match
1345 * ----- ----- -----
1346 * ANY READ true
1347 * ANY RW true
1348 * RW READ false
1349 * RW RW true
1350 * READ READ true
1351 * READ RW true
1352 */
1353static bool
1354pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1355 const struct pnfs_layout_range *range)
1356{
1357 struct pnfs_layout_range range1;
1358
1359 if ((range->iomode == IOMODE_RW &&
1360 ls_range->iomode != IOMODE_RW) ||
1361 !pnfs_lseg_range_intersecting(ls_range, range))
1362 return 0;
1363
1364 /* range1 covers only the first byte in the range */
1365 range1 = *range;
1366 range1.length = 1;
1367 return pnfs_lseg_range_contained(ls_range, &range1);
1368}
1369
1370/*
1371 * lookup range in layout
1372 */
1373static struct pnfs_layout_segment *
1374pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1375 struct pnfs_layout_range *range)
1376{
1377 struct pnfs_layout_segment *lseg, *ret = NULL;
1378
1379 dprintk("%s:Begin\n", __func__);
1380
1381 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1382 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1383 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1384 pnfs_lseg_range_match(&lseg->pls_range, range)) {
1385 ret = pnfs_get_lseg(lseg);
1386 break;
1387 }
1388 }
1389
1390 dprintk("%s:Return lseg %p ref %d\n",
1391 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1392 return ret;
1393}
1394
1395/*
1396 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1397 * to the MDS or over pNFS
1398 *
1399 * The nfs_inode read_io and write_io fields are cumulative counters reset
1400 * when there are no layout segments. Note that in pnfs_update_layout iomode
1401 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1402 * WRITE request.
1403 *
1404 * A return of true means use MDS I/O.
1405 *
1406 * From rfc 5661:
1407 * If a file's size is smaller than the file size threshold, data accesses
1408 * SHOULD be sent to the metadata server. If an I/O request has a length that
1409 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1410 * server. If both file size and I/O size are provided, the client SHOULD
1411 * reach or exceed both thresholds before sending its read or write
1412 * requests to the data server.
1413 */
1414static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1415 struct inode *ino, int iomode)
1416{
1417 struct nfs4_threshold *t = ctx->mdsthreshold;
1418 struct nfs_inode *nfsi = NFS_I(ino);
1419 loff_t fsize = i_size_read(ino);
1420 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1421
1422 if (t == NULL)
1423 return ret;
1424
1425 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1426 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1427
1428 switch (iomode) {
1429 case IOMODE_READ:
1430 if (t->bm & THRESHOLD_RD) {
1431 dprintk("%s fsize %llu\n", __func__, fsize);
1432 size_set = true;
1433 if (fsize < t->rd_sz)
1434 size = true;
1435 }
1436 if (t->bm & THRESHOLD_RD_IO) {
1437 dprintk("%s nfsi->read_io %llu\n", __func__,
1438 nfsi->read_io);
1439 io_set = true;
1440 if (nfsi->read_io < t->rd_io_sz)
1441 io = true;
1442 }
1443 break;
1444 case IOMODE_RW:
1445 if (t->bm & THRESHOLD_WR) {
1446 dprintk("%s fsize %llu\n", __func__, fsize);
1447 size_set = true;
1448 if (fsize < t->wr_sz)
1449 size = true;
1450 }
1451 if (t->bm & THRESHOLD_WR_IO) {
1452 dprintk("%s nfsi->write_io %llu\n", __func__,
1453 nfsi->write_io);
1454 io_set = true;
1455 if (nfsi->write_io < t->wr_io_sz)
1456 io = true;
1457 }
1458 break;
1459 }
1460 if (size_set && io_set) {
1461 if (size && io)
1462 ret = true;
1463 } else if (size || io)
1464 ret = true;
1465
1466 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1467 return ret;
1468}
1469
1470static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1471{
1472 /*
1473 * send layoutcommit as it can hold up layoutreturn due to lseg
1474 * reference
1475 */
1476 pnfs_layoutcommit_inode(lo->plh_inode, false);
1477 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1478 nfs_wait_bit_killable,
1479 TASK_UNINTERRUPTIBLE);
1480}
1481
1482static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1483{
1484 unsigned long *bitlock = &lo->plh_flags;
1485
1486 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1487 smp_mb__after_atomic();
1488 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1489}
1490
1491/*
1492 * Layout segment is retreived from the server if not cached.
1493 * The appropriate layout segment is referenced and returned to the caller.
1494 */
1495struct pnfs_layout_segment *
1496pnfs_update_layout(struct inode *ino,
1497 struct nfs_open_context *ctx,
1498 loff_t pos,
1499 u64 count,
1500 enum pnfs_iomode iomode,
1501 gfp_t gfp_flags)
1502{
1503 struct pnfs_layout_range arg = {
1504 .iomode = iomode,
1505 .offset = pos,
1506 .length = count,
1507 };
1508 unsigned pg_offset;
1509 struct nfs_server *server = NFS_SERVER(ino);
1510 struct nfs_client *clp = server->nfs_client;
1511 struct pnfs_layout_hdr *lo;
1512 struct pnfs_layout_segment *lseg = NULL;
1513 bool first;
1514
1515 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1516 trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1517 PNFS_UPDATE_LAYOUT_NO_PNFS);
1518 goto out;
1519 }
1520
1521 if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1522 trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1523 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1524 goto out;
1525 }
1526
1527 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1528 trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1529 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1530 goto out;
1531 }
1532
1533lookup_again:
1534 first = false;
1535 spin_lock(&ino->i_lock);
1536 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1537 if (lo == NULL) {
1538 spin_unlock(&ino->i_lock);
1539 trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
1540 PNFS_UPDATE_LAYOUT_NOMEM);
1541 goto out;
1542 }
1543
1544 /* Do we even need to bother with this? */
1545 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1546 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1547 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1548 dprintk("%s matches recall, use MDS\n", __func__);
1549 goto out_unlock;
1550 }
1551
1552 /* if LAYOUTGET already failed once we don't try again */
1553 if (pnfs_layout_io_test_failed(lo, iomode)) {
1554 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1555 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1556 goto out_unlock;
1557 }
1558
1559 first = list_empty(&lo->plh_segs);
1560 if (first) {
1561 /* The first layoutget for the file. Need to serialize per
1562 * RFC 5661 Errata 3208.
1563 */
1564 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1565 &lo->plh_flags)) {
1566 spin_unlock(&ino->i_lock);
1567 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1568 TASK_UNINTERRUPTIBLE);
1569 pnfs_put_layout_hdr(lo);
1570 goto lookup_again;
1571 }
1572 } else {
1573 /* Check to see if the layout for the given range
1574 * already exists
1575 */
1576 lseg = pnfs_find_lseg(lo, &arg);
1577 if (lseg) {
1578 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1579 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1580 goto out_unlock;
1581 }
1582 }
1583
1584 /*
1585 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1586 * for LAYOUTRETURN even if first is true.
1587 */
1588 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1589 spin_unlock(&ino->i_lock);
1590 dprintk("%s wait for layoutreturn\n", __func__);
1591 if (pnfs_prepare_to_retry_layoutget(lo)) {
1592 if (first)
1593 pnfs_clear_first_layoutget(lo);
1594 pnfs_put_layout_hdr(lo);
1595 dprintk("%s retrying\n", __func__);
1596 goto lookup_again;
1597 }
1598 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1599 PNFS_UPDATE_LAYOUT_RETURN);
1600 goto out_put_layout_hdr;
1601 }
1602
1603 if (pnfs_layoutgets_blocked(lo)) {
1604 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1605 PNFS_UPDATE_LAYOUT_BLOCKED);
1606 goto out_unlock;
1607 }
1608 atomic_inc(&lo->plh_outstanding);
1609 spin_unlock(&ino->i_lock);
1610
1611 if (list_empty(&lo->plh_layouts)) {
1612 /* The lo must be on the clp list if there is any
1613 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1614 */
1615 spin_lock(&clp->cl_lock);
1616 if (list_empty(&lo->plh_layouts))
1617 list_add_tail(&lo->plh_layouts, &server->layouts);
1618 spin_unlock(&clp->cl_lock);
1619 }
1620
1621 pg_offset = arg.offset & ~PAGE_MASK;
1622 if (pg_offset) {
1623 arg.offset -= pg_offset;
1624 arg.length += pg_offset;
1625 }
1626 if (arg.length != NFS4_MAX_UINT64)
1627 arg.length = PAGE_ALIGN(arg.length);
1628
1629 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1630 atomic_dec(&lo->plh_outstanding);
1631 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1632 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1633out_put_layout_hdr:
1634 if (first)
1635 pnfs_clear_first_layoutget(lo);
1636 pnfs_put_layout_hdr(lo);
1637out:
1638 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1639 "(%s, offset: %llu, length: %llu)\n",
1640 __func__, ino->i_sb->s_id,
1641 (unsigned long long)NFS_FILEID(ino),
1642 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1643 iomode==IOMODE_RW ? "read/write" : "read-only",
1644 (unsigned long long)pos,
1645 (unsigned long long)count);
1646 return lseg;
1647out_unlock:
1648 spin_unlock(&ino->i_lock);
1649 goto out_put_layout_hdr;
1650}
1651EXPORT_SYMBOL_GPL(pnfs_update_layout);
1652
1653static bool
1654pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1655{
1656 switch (range->iomode) {
1657 case IOMODE_READ:
1658 case IOMODE_RW:
1659 break;
1660 default:
1661 return false;
1662 }
1663 if (range->offset == NFS4_MAX_UINT64)
1664 return false;
1665 if (range->length == 0)
1666 return false;
1667 if (range->length != NFS4_MAX_UINT64 &&
1668 range->length > NFS4_MAX_UINT64 - range->offset)
1669 return false;
1670 return true;
1671}
1672
1673struct pnfs_layout_segment *
1674pnfs_layout_process(struct nfs4_layoutget *lgp)
1675{
1676 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1677 struct nfs4_layoutget_res *res = &lgp->res;
1678 struct pnfs_layout_segment *lseg;
1679 struct inode *ino = lo->plh_inode;
1680 LIST_HEAD(free_me);
1681 int status = -EINVAL;
1682
1683 if (!pnfs_sanity_check_layout_range(&res->range))
1684 goto out;
1685
1686 /* Inject layout blob into I/O device driver */
1687 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1688 if (!lseg || IS_ERR(lseg)) {
1689 if (!lseg)
1690 status = -ENOMEM;
1691 else
1692 status = PTR_ERR(lseg);
1693 dprintk("%s: Could not allocate layout: error %d\n",
1694 __func__, status);
1695 goto out;
1696 }
1697
1698 init_lseg(lo, lseg);
1699 lseg->pls_range = res->range;
1700
1701 spin_lock(&ino->i_lock);
1702 if (pnfs_layoutgets_blocked(lo)) {
1703 dprintk("%s forget reply due to state\n", __func__);
1704 goto out_forget_reply;
1705 }
1706
1707 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1708 /* existing state ID, make sure the sequence number matches. */
1709 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1710 dprintk("%s forget reply due to sequence\n", __func__);
1711 status = -EAGAIN;
1712 goto out_forget_reply;
1713 }
1714 pnfs_set_layout_stateid(lo, &res->stateid, false);
1715 } else {
1716 /*
1717 * We got an entirely new state ID. Mark all segments for the
1718 * inode invalid, and don't bother validating the stateid
1719 * sequence number.
1720 */
1721 pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL);
1722
1723 nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
1724 lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
1725 }
1726
1727 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1728
1729 pnfs_get_lseg(lseg);
1730 pnfs_layout_insert_lseg(lo, lseg, &free_me);
1731
1732 if (res->return_on_close)
1733 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1734
1735 spin_unlock(&ino->i_lock);
1736 pnfs_free_lseg_list(&free_me);
1737 return lseg;
1738out:
1739 return ERR_PTR(status);
1740
1741out_forget_reply:
1742 spin_unlock(&ino->i_lock);
1743 lseg->pls_layout = lo;
1744 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1745 goto out;
1746}
1747
1748static void
1749pnfs_set_plh_return_iomode(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode)
1750{
1751 if (lo->plh_return_iomode == iomode)
1752 return;
1753 if (lo->plh_return_iomode != 0)
1754 iomode = IOMODE_ANY;
1755 lo->plh_return_iomode = iomode;
1756 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
1757}
1758
1759/**
1760 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1761 * @lo: pointer to layout header
1762 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1763 * @return_range: describe layout segment ranges to be returned
1764 *
1765 * This function is mainly intended for use by layoutrecall. It attempts
1766 * to free the layout segment immediately, or else to mark it for return
1767 * as soon as its reference count drops to zero.
1768 */
1769int
1770pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
1771 struct list_head *tmp_list,
1772 const struct pnfs_layout_range *return_range)
1773{
1774 struct pnfs_layout_segment *lseg, *next;
1775 int remaining = 0;
1776
1777 dprintk("%s:Begin lo %p\n", __func__, lo);
1778
1779 if (list_empty(&lo->plh_segs))
1780 return 0;
1781
1782 assert_spin_locked(&lo->plh_inode->i_lock);
1783
1784 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
1785 if (should_free_lseg(&lseg->pls_range, return_range)) {
1786 dprintk("%s: marking lseg %p iomode %d "
1787 "offset %llu length %llu\n", __func__,
1788 lseg, lseg->pls_range.iomode,
1789 lseg->pls_range.offset,
1790 lseg->pls_range.length);
1791 if (mark_lseg_invalid(lseg, tmp_list))
1792 continue;
1793 remaining++;
1794 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1795 pnfs_set_plh_return_iomode(lo, return_range->iomode);
1796 }
1797 return remaining;
1798}
1799
1800void pnfs_error_mark_layout_for_return(struct inode *inode,
1801 struct pnfs_layout_segment *lseg)
1802{
1803 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
1804 struct pnfs_layout_range range = {
1805 .iomode = lseg->pls_range.iomode,
1806 .offset = 0,
1807 .length = NFS4_MAX_UINT64,
1808 };
1809 LIST_HEAD(free_me);
1810 bool return_now = false;
1811
1812 spin_lock(&inode->i_lock);
1813 pnfs_set_plh_return_iomode(lo, range.iomode);
1814 /*
1815 * mark all matching lsegs so that we are sure to have no live
1816 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1817 * for how it works.
1818 */
1819 if (!pnfs_mark_matching_lsegs_return(lo, &free_me, &range)) {
1820 nfs4_stateid stateid;
1821 enum pnfs_iomode iomode = lo->plh_return_iomode;
1822
1823 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1824 return_now = pnfs_prepare_layoutreturn(lo);
1825 spin_unlock(&inode->i_lock);
1826 if (return_now)
1827 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1828 } else {
1829 spin_unlock(&inode->i_lock);
1830 nfs_commit_inode(inode, 0);
1831 }
1832 pnfs_free_lseg_list(&free_me);
1833}
1834EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
1835
1836void
1837pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1838{
1839 u64 rd_size = req->wb_bytes;
1840
1841 if (pgio->pg_lseg == NULL) {
1842 if (pgio->pg_dreq == NULL)
1843 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
1844 else
1845 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1846
1847 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1848 req->wb_context,
1849 req_offset(req),
1850 rd_size,
1851 IOMODE_READ,
1852 GFP_KERNEL);
1853 if (IS_ERR(pgio->pg_lseg)) {
1854 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1855 pgio->pg_lseg = NULL;
1856 return;
1857 }
1858 }
1859 /* If no lseg, fall back to read through mds */
1860 if (pgio->pg_lseg == NULL)
1861 nfs_pageio_reset_read_mds(pgio);
1862
1863}
1864EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1865
1866void
1867pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
1868 struct nfs_page *req, u64 wb_size)
1869{
1870 if (pgio->pg_lseg == NULL) {
1871 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1872 req->wb_context,
1873 req_offset(req),
1874 wb_size,
1875 IOMODE_RW,
1876 GFP_NOFS);
1877 if (IS_ERR(pgio->pg_lseg)) {
1878 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1879 pgio->pg_lseg = NULL;
1880 return;
1881 }
1882 }
1883 /* If no lseg, fall back to write through mds */
1884 if (pgio->pg_lseg == NULL)
1885 nfs_pageio_reset_write_mds(pgio);
1886}
1887EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1888
1889void
1890pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
1891{
1892 if (desc->pg_lseg) {
1893 pnfs_put_lseg(desc->pg_lseg);
1894 desc->pg_lseg = NULL;
1895 }
1896}
1897EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
1898
1899/*
1900 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1901 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1902 */
1903size_t
1904pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
1905 struct nfs_page *prev, struct nfs_page *req)
1906{
1907 unsigned int size;
1908 u64 seg_end, req_start, seg_left;
1909
1910 size = nfs_generic_pg_test(pgio, prev, req);
1911 if (!size)
1912 return 0;
1913
1914 /*
1915 * 'size' contains the number of bytes left in the current page (up
1916 * to the original size asked for in @req->wb_bytes).
1917 *
1918 * Calculate how many bytes are left in the layout segment
1919 * and if there are less bytes than 'size', return that instead.
1920 *
1921 * Please also note that 'end_offset' is actually the offset of the
1922 * first byte that lies outside the pnfs_layout_range. FIXME?
1923 *
1924 */
1925 if (pgio->pg_lseg) {
1926 seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
1927 pgio->pg_lseg->pls_range.length);
1928 req_start = req_offset(req);
1929 WARN_ON_ONCE(req_start >= seg_end);
1930 /* start of request is past the last byte of this segment */
1931 if (req_start >= seg_end) {
1932 /* reference the new lseg */
1933 if (pgio->pg_ops->pg_cleanup)
1934 pgio->pg_ops->pg_cleanup(pgio);
1935 if (pgio->pg_ops->pg_init)
1936 pgio->pg_ops->pg_init(pgio, req);
1937 return 0;
1938 }
1939
1940 /* adjust 'size' iff there are fewer bytes left in the
1941 * segment than what nfs_generic_pg_test returned */
1942 seg_left = seg_end - req_start;
1943 if (seg_left < size)
1944 size = (unsigned int)seg_left;
1945 }
1946
1947 return size;
1948}
1949EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1950
1951int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1952{
1953 struct nfs_pageio_descriptor pgio;
1954
1955 /* Resend all requests through the MDS */
1956 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
1957 hdr->completion_ops);
1958 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
1959 return nfs_pageio_resend(&pgio, hdr);
1960}
1961EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1962
1963static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1964{
1965
1966 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1967 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1968 PNFS_LAYOUTRET_ON_ERROR) {
1969 pnfs_return_layout(hdr->inode);
1970 }
1971 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1972 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1973}
1974
1975/*
1976 * Called by non rpc-based layout drivers
1977 */
1978void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
1979{
1980 if (likely(!hdr->pnfs_error)) {
1981 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1982 hdr->mds_offset + hdr->res.count);
1983 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
1984 }
1985 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
1986 if (unlikely(hdr->pnfs_error))
1987 pnfs_ld_handle_write_error(hdr);
1988 hdr->mds_ops->rpc_release(hdr);
1989}
1990EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1991
1992static void
1993pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1994 struct nfs_pgio_header *hdr)
1995{
1996 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1997
1998 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1999 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2000 nfs_pageio_reset_write_mds(desc);
2001 mirror->pg_recoalesce = 1;
2002 }
2003 nfs_pgio_data_destroy(hdr);
2004 hdr->release(hdr);
2005}
2006
2007static enum pnfs_try_status
2008pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2009 const struct rpc_call_ops *call_ops,
2010 struct pnfs_layout_segment *lseg,
2011 int how)
2012{
2013 struct inode *inode = hdr->inode;
2014 enum pnfs_try_status trypnfs;
2015 struct nfs_server *nfss = NFS_SERVER(inode);
2016
2017 hdr->mds_ops = call_ops;
2018
2019 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2020 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2021 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2022 if (trypnfs != PNFS_NOT_ATTEMPTED)
2023 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2024 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2025 return trypnfs;
2026}
2027
2028static void
2029pnfs_do_write(struct nfs_pageio_descriptor *desc,
2030 struct nfs_pgio_header *hdr, int how)
2031{
2032 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2033 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2034 enum pnfs_try_status trypnfs;
2035
2036 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2037 if (trypnfs == PNFS_NOT_ATTEMPTED)
2038 pnfs_write_through_mds(desc, hdr);
2039}
2040
2041static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2042{
2043 pnfs_put_lseg(hdr->lseg);
2044 nfs_pgio_header_free(hdr);
2045}
2046
2047int
2048pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2049{
2050 struct nfs_pgio_header *hdr;
2051 int ret;
2052
2053 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2054 if (!hdr) {
2055 desc->pg_error = -ENOMEM;
2056 return desc->pg_error;
2057 }
2058 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2059
2060 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2061 ret = nfs_generic_pgio(desc, hdr);
2062 if (!ret)
2063 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2064
2065 return ret;
2066}
2067EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2068
2069int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2070{
2071 struct nfs_pageio_descriptor pgio;
2072
2073 /* Resend all requests through the MDS */
2074 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2075 return nfs_pageio_resend(&pgio, hdr);
2076}
2077EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2078
2079static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2080{
2081 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2082 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2083 PNFS_LAYOUTRET_ON_ERROR) {
2084 pnfs_return_layout(hdr->inode);
2085 }
2086 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2087 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2088}
2089
2090/*
2091 * Called by non rpc-based layout drivers
2092 */
2093void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2094{
2095 if (likely(!hdr->pnfs_error)) {
2096 __nfs4_read_done_cb(hdr);
2097 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2098 }
2099 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2100 if (unlikely(hdr->pnfs_error))
2101 pnfs_ld_handle_read_error(hdr);
2102 hdr->mds_ops->rpc_release(hdr);
2103}
2104EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2105
2106static void
2107pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2108 struct nfs_pgio_header *hdr)
2109{
2110 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2111
2112 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2113 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2114 nfs_pageio_reset_read_mds(desc);
2115 mirror->pg_recoalesce = 1;
2116 }
2117 nfs_pgio_data_destroy(hdr);
2118 hdr->release(hdr);
2119}
2120
2121/*
2122 * Call the appropriate parallel I/O subsystem read function.
2123 */
2124static enum pnfs_try_status
2125pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2126 const struct rpc_call_ops *call_ops,
2127 struct pnfs_layout_segment *lseg)
2128{
2129 struct inode *inode = hdr->inode;
2130 struct nfs_server *nfss = NFS_SERVER(inode);
2131 enum pnfs_try_status trypnfs;
2132
2133 hdr->mds_ops = call_ops;
2134
2135 dprintk("%s: Reading ino:%lu %u@%llu\n",
2136 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2137
2138 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2139 if (trypnfs != PNFS_NOT_ATTEMPTED)
2140 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2141 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2142 return trypnfs;
2143}
2144
2145/* Resend all requests through pnfs. */
2146int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2147{
2148 struct nfs_pageio_descriptor pgio;
2149
2150 nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
2151 return nfs_pageio_resend(&pgio, hdr);
2152}
2153EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2154
2155static void
2156pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2157{
2158 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2159 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2160 enum pnfs_try_status trypnfs;
2161 int err = 0;
2162
2163 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2164 if (trypnfs == PNFS_TRY_AGAIN)
2165 err = pnfs_read_resend_pnfs(hdr);
2166 if (trypnfs == PNFS_NOT_ATTEMPTED || err)
2167 pnfs_read_through_mds(desc, hdr);
2168}
2169
2170static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2171{
2172 pnfs_put_lseg(hdr->lseg);
2173 nfs_pgio_header_free(hdr);
2174}
2175
2176int
2177pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2178{
2179 struct nfs_pgio_header *hdr;
2180 int ret;
2181
2182 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2183 if (!hdr) {
2184 desc->pg_error = -ENOMEM;
2185 return desc->pg_error;
2186 }
2187 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2188 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2189 ret = nfs_generic_pgio(desc, hdr);
2190 if (!ret)
2191 pnfs_do_read(desc, hdr);
2192 return ret;
2193}
2194EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2195
2196static void pnfs_clear_layoutcommitting(struct inode *inode)
2197{
2198 unsigned long *bitlock = &NFS_I(inode)->flags;
2199
2200 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2201 smp_mb__after_atomic();
2202 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2203}
2204
2205/*
2206 * There can be multiple RW segments.
2207 */
2208static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2209{
2210 struct pnfs_layout_segment *lseg;
2211
2212 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2213 if (lseg->pls_range.iomode == IOMODE_RW &&
2214 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2215 list_add(&lseg->pls_lc_list, listp);
2216 }
2217}
2218
2219static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2220{
2221 struct pnfs_layout_segment *lseg, *tmp;
2222
2223 /* Matched by references in pnfs_set_layoutcommit */
2224 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2225 list_del_init(&lseg->pls_lc_list);
2226 pnfs_put_lseg(lseg);
2227 }
2228
2229 pnfs_clear_layoutcommitting(inode);
2230}
2231
2232void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2233{
2234 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2235}
2236EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2237
2238void
2239pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2240 loff_t end_pos)
2241{
2242 struct nfs_inode *nfsi = NFS_I(inode);
2243 bool mark_as_dirty = false;
2244
2245 spin_lock(&inode->i_lock);
2246 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2247 nfsi->layout->plh_lwb = end_pos;
2248 mark_as_dirty = true;
2249 dprintk("%s: Set layoutcommit for inode %lu ",
2250 __func__, inode->i_ino);
2251 } else if (end_pos > nfsi->layout->plh_lwb)
2252 nfsi->layout->plh_lwb = end_pos;
2253 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2254 /* references matched in nfs4_layoutcommit_release */
2255 pnfs_get_lseg(lseg);
2256 }
2257 spin_unlock(&inode->i_lock);
2258 dprintk("%s: lseg %p end_pos %llu\n",
2259 __func__, lseg, nfsi->layout->plh_lwb);
2260
2261 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2262 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2263 if (mark_as_dirty)
2264 mark_inode_dirty_sync(inode);
2265}
2266EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2267
2268void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2269{
2270 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2271
2272 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2273 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2274 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2275}
2276
2277/*
2278 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2279 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2280 * data to disk to allow the server to recover the data if it crashes.
2281 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2282 * is off, and a COMMIT is sent to a data server, or
2283 * if WRITEs to a data server return NFS_DATA_SYNC.
2284 */
2285int
2286pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2287{
2288 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2289 struct nfs4_layoutcommit_data *data;
2290 struct nfs_inode *nfsi = NFS_I(inode);
2291 loff_t end_pos;
2292 int status;
2293
2294 if (!pnfs_layoutcommit_outstanding(inode))
2295 return 0;
2296
2297 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2298
2299 status = -EAGAIN;
2300 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2301 if (!sync)
2302 goto out;
2303 status = wait_on_bit_lock_action(&nfsi->flags,
2304 NFS_INO_LAYOUTCOMMITTING,
2305 nfs_wait_bit_killable,
2306 TASK_KILLABLE);
2307 if (status)
2308 goto out;
2309 }
2310
2311 status = -ENOMEM;
2312 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2313 data = kzalloc(sizeof(*data), GFP_NOFS);
2314 if (!data)
2315 goto clear_layoutcommitting;
2316
2317 status = 0;
2318 spin_lock(&inode->i_lock);
2319 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2320 goto out_unlock;
2321
2322 INIT_LIST_HEAD(&data->lseg_list);
2323 pnfs_list_write_lseg(inode, &data->lseg_list);
2324
2325 end_pos = nfsi->layout->plh_lwb;
2326
2327 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2328 spin_unlock(&inode->i_lock);
2329
2330 data->args.inode = inode;
2331 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2332 nfs_fattr_init(&data->fattr);
2333 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2334 data->res.fattr = &data->fattr;
2335 data->args.lastbytewritten = end_pos - 1;
2336 data->res.server = NFS_SERVER(inode);
2337
2338 if (ld->prepare_layoutcommit) {
2339 status = ld->prepare_layoutcommit(&data->args);
2340 if (status) {
2341 put_rpccred(data->cred);
2342 spin_lock(&inode->i_lock);
2343 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2344 if (end_pos > nfsi->layout->plh_lwb)
2345 nfsi->layout->plh_lwb = end_pos;
2346 goto out_unlock;
2347 }
2348 }
2349
2350
2351 status = nfs4_proc_layoutcommit(data, sync);
2352out:
2353 if (status)
2354 mark_inode_dirty_sync(inode);
2355 dprintk("<-- %s status %d\n", __func__, status);
2356 return status;
2357out_unlock:
2358 spin_unlock(&inode->i_lock);
2359 kfree(data);
2360clear_layoutcommitting:
2361 pnfs_clear_layoutcommitting(inode);
2362 goto out;
2363}
2364EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2365
2366int
2367pnfs_generic_sync(struct inode *inode, bool datasync)
2368{
2369 return pnfs_layoutcommit_inode(inode, true);
2370}
2371EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2372
2373struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2374{
2375 struct nfs4_threshold *thp;
2376
2377 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2378 if (!thp) {
2379 dprintk("%s mdsthreshold allocation failed\n", __func__);
2380 return NULL;
2381 }
2382 return thp;
2383}
2384
2385#if IS_ENABLED(CONFIG_NFS_V4_2)
2386int
2387pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2388{
2389 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2390 struct nfs_server *server = NFS_SERVER(inode);
2391 struct nfs_inode *nfsi = NFS_I(inode);
2392 struct nfs42_layoutstat_data *data;
2393 struct pnfs_layout_hdr *hdr;
2394 int status = 0;
2395
2396 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2397 goto out;
2398
2399 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2400 goto out;
2401
2402 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2403 goto out;
2404
2405 spin_lock(&inode->i_lock);
2406 if (!NFS_I(inode)->layout) {
2407 spin_unlock(&inode->i_lock);
2408 goto out;
2409 }
2410 hdr = NFS_I(inode)->layout;
2411 pnfs_get_layout_hdr(hdr);
2412 spin_unlock(&inode->i_lock);
2413
2414 data = kzalloc(sizeof(*data), gfp_flags);
2415 if (!data) {
2416 status = -ENOMEM;
2417 goto out_put;
2418 }
2419
2420 data->args.fh = NFS_FH(inode);
2421 data->args.inode = inode;
2422 nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
2423 status = ld->prepare_layoutstats(&data->args);
2424 if (status)
2425 goto out_free;
2426
2427 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2428
2429out:
2430 dprintk("%s returns %d\n", __func__, status);
2431 return status;
2432
2433out_free:
2434 kfree(data);
2435out_put:
2436 pnfs_put_layout_hdr(hdr);
2437 smp_mb__before_atomic();
2438 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2439 smp_mb__after_atomic();
2440 goto out;
2441}
2442EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2443#endif
2444
2445unsigned int layoutstats_timer;
2446module_param(layoutstats_timer, uint, 0644);
2447EXPORT_SYMBOL_GPL(layoutstats_timer);