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1/*
2 * pNFS functions to call and manage layout drivers.
3 *
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#include <linux/nfs_fs.h>
31#include <linux/nfs_page.h>
32#include <linux/module.h>
33#include <linux/sort.h>
34#include "internal.h"
35#include "pnfs.h"
36#include "iostat.h"
37#include "nfs4trace.h"
38#include "delegation.h"
39#include "nfs42.h"
40
41#define NFSDBG_FACILITY NFSDBG_PNFS
42#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
43
44/* Locking:
45 *
46 * pnfs_spinlock:
47 * protects pnfs_modules_tbl.
48 */
49static DEFINE_SPINLOCK(pnfs_spinlock);
50
51/*
52 * pnfs_modules_tbl holds all pnfs modules
53 */
54static LIST_HEAD(pnfs_modules_tbl);
55
56static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
57static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
58 struct list_head *free_me,
59 const struct pnfs_layout_range *range,
60 u32 seq);
61static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
62 struct list_head *tmp_list);
63
64/* Return the registered pnfs layout driver module matching given id */
65static struct pnfs_layoutdriver_type *
66find_pnfs_driver_locked(u32 id)
67{
68 struct pnfs_layoutdriver_type *local;
69
70 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
71 if (local->id == id)
72 goto out;
73 local = NULL;
74out:
75 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
76 return local;
77}
78
79static struct pnfs_layoutdriver_type *
80find_pnfs_driver(u32 id)
81{
82 struct pnfs_layoutdriver_type *local;
83
84 spin_lock(&pnfs_spinlock);
85 local = find_pnfs_driver_locked(id);
86 if (local != NULL && !try_module_get(local->owner)) {
87 dprintk("%s: Could not grab reference on module\n", __func__);
88 local = NULL;
89 }
90 spin_unlock(&pnfs_spinlock);
91 return local;
92}
93
94void
95unset_pnfs_layoutdriver(struct nfs_server *nfss)
96{
97 if (nfss->pnfs_curr_ld) {
98 if (nfss->pnfs_curr_ld->clear_layoutdriver)
99 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
100 /* Decrement the MDS count. Purge the deviceid cache if zero */
101 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
102 nfs4_deviceid_purge_client(nfss->nfs_client);
103 module_put(nfss->pnfs_curr_ld->owner);
104 }
105 nfss->pnfs_curr_ld = NULL;
106}
107
108/*
109 * When the server sends a list of layout types, we choose one in the order
110 * given in the list below.
111 *
112 * FIXME: should this list be configurable in some fashion? module param?
113 * mount option? something else?
114 */
115static const u32 ld_prefs[] = {
116 LAYOUT_SCSI,
117 LAYOUT_BLOCK_VOLUME,
118 LAYOUT_OSD2_OBJECTS,
119 LAYOUT_FLEX_FILES,
120 LAYOUT_NFSV4_1_FILES,
121 0
122};
123
124static int
125ld_cmp(const void *e1, const void *e2)
126{
127 u32 ld1 = *((u32 *)e1);
128 u32 ld2 = *((u32 *)e2);
129 int i;
130
131 for (i = 0; ld_prefs[i] != 0; i++) {
132 if (ld1 == ld_prefs[i])
133 return -1;
134
135 if (ld2 == ld_prefs[i])
136 return 1;
137 }
138 return 0;
139}
140
141/*
142 * Try to set the server's pnfs module to the pnfs layout type specified by id.
143 * Currently only one pNFS layout driver per filesystem is supported.
144 *
145 * @ids array of layout types supported by MDS.
146 */
147void
148set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
149 struct nfs_fsinfo *fsinfo)
150{
151 struct pnfs_layoutdriver_type *ld_type = NULL;
152 u32 id;
153 int i;
154
155 if (fsinfo->nlayouttypes == 0)
156 goto out_no_driver;
157 if (!(server->nfs_client->cl_exchange_flags &
158 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
159 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
160 __func__, server->nfs_client->cl_exchange_flags);
161 goto out_no_driver;
162 }
163
164 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
165 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
166
167 for (i = 0; i < fsinfo->nlayouttypes; i++) {
168 id = fsinfo->layouttype[i];
169 ld_type = find_pnfs_driver(id);
170 if (!ld_type) {
171 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
172 id);
173 ld_type = find_pnfs_driver(id);
174 }
175 if (ld_type)
176 break;
177 }
178
179 if (!ld_type) {
180 dprintk("%s: No pNFS module found!\n", __func__);
181 goto out_no_driver;
182 }
183
184 server->pnfs_curr_ld = ld_type;
185 if (ld_type->set_layoutdriver
186 && ld_type->set_layoutdriver(server, mntfh)) {
187 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
188 "driver %u.\n", __func__, id);
189 module_put(ld_type->owner);
190 goto out_no_driver;
191 }
192 /* Bump the MDS count */
193 atomic_inc(&server->nfs_client->cl_mds_count);
194
195 dprintk("%s: pNFS module for %u set\n", __func__, id);
196 return;
197
198out_no_driver:
199 dprintk("%s: Using NFSv4 I/O\n", __func__);
200 server->pnfs_curr_ld = NULL;
201}
202
203int
204pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
205{
206 int status = -EINVAL;
207 struct pnfs_layoutdriver_type *tmp;
208
209 if (ld_type->id == 0) {
210 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
211 return status;
212 }
213 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
214 printk(KERN_ERR "NFS: %s Layout driver must provide "
215 "alloc_lseg and free_lseg.\n", __func__);
216 return status;
217 }
218
219 spin_lock(&pnfs_spinlock);
220 tmp = find_pnfs_driver_locked(ld_type->id);
221 if (!tmp) {
222 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
223 status = 0;
224 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
225 ld_type->name);
226 } else {
227 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
228 __func__, ld_type->id);
229 }
230 spin_unlock(&pnfs_spinlock);
231
232 return status;
233}
234EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
235
236void
237pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
238{
239 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
240 spin_lock(&pnfs_spinlock);
241 list_del(&ld_type->pnfs_tblid);
242 spin_unlock(&pnfs_spinlock);
243}
244EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
245
246/*
247 * pNFS client layout cache
248 */
249
250/* Need to hold i_lock if caller does not already hold reference */
251void
252pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
253{
254 refcount_inc(&lo->plh_refcount);
255}
256
257static struct pnfs_layout_hdr *
258pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
259{
260 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
261 return ld->alloc_layout_hdr(ino, gfp_flags);
262}
263
264static void
265pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
266{
267 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
268 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
269
270 if (!list_empty(&lo->plh_layouts)) {
271 struct nfs_client *clp = server->nfs_client;
272
273 spin_lock(&clp->cl_lock);
274 list_del_init(&lo->plh_layouts);
275 spin_unlock(&clp->cl_lock);
276 }
277 put_rpccred(lo->plh_lc_cred);
278 return ld->free_layout_hdr(lo);
279}
280
281static void
282pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
283{
284 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
285 dprintk("%s: freeing layout cache %p\n", __func__, lo);
286 nfsi->layout = NULL;
287 /* Reset MDS Threshold I/O counters */
288 nfsi->write_io = 0;
289 nfsi->read_io = 0;
290}
291
292void
293pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
294{
295 struct inode *inode;
296
297 if (!lo)
298 return;
299 inode = lo->plh_inode;
300 pnfs_layoutreturn_before_put_layout_hdr(lo);
301
302 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
303 if (!list_empty(&lo->plh_segs))
304 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
305 pnfs_detach_layout_hdr(lo);
306 spin_unlock(&inode->i_lock);
307 pnfs_free_layout_hdr(lo);
308 }
309}
310
311static void
312pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
313 u32 seq)
314{
315 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
316 iomode = IOMODE_ANY;
317 lo->plh_return_iomode = iomode;
318 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
319 if (seq != 0) {
320 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
321 lo->plh_return_seq = seq;
322 }
323}
324
325static void
326pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
327{
328 struct pnfs_layout_segment *lseg;
329 lo->plh_return_iomode = 0;
330 lo->plh_return_seq = 0;
331 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
332 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
333 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
334 continue;
335 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
336 }
337}
338
339static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
340{
341 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
342 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
343 smp_mb__after_atomic();
344 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
345 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
346}
347
348static void
349pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
350 struct list_head *free_me)
351{
352 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
353 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
354 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
355 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
356 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
357 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
358}
359
360/*
361 * Update the seqid of a layout stateid
362 */
363bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, struct inode *inode)
364{
365 struct pnfs_layout_hdr *lo;
366 bool ret = false;
367
368 spin_lock(&inode->i_lock);
369 lo = NFS_I(inode)->layout;
370 if (lo && nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
371 dst->seqid = lo->plh_stateid.seqid;
372 ret = true;
373 }
374 spin_unlock(&inode->i_lock);
375 return ret;
376}
377
378/*
379 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
380 *
381 * In order to continue using the pnfs_layout_hdr, a full recovery
382 * is required.
383 * Note that caller must hold inode->i_lock.
384 */
385int
386pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
387 struct list_head *lseg_list)
388{
389 struct pnfs_layout_range range = {
390 .iomode = IOMODE_ANY,
391 .offset = 0,
392 .length = NFS4_MAX_UINT64,
393 };
394 struct pnfs_layout_segment *lseg, *next;
395
396 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
397 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
398 pnfs_clear_lseg_state(lseg, lseg_list);
399 pnfs_clear_layoutreturn_info(lo);
400 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
401 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
402 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
403 pnfs_clear_layoutreturn_waitbit(lo);
404 return !list_empty(&lo->plh_segs);
405}
406
407static int
408pnfs_iomode_to_fail_bit(u32 iomode)
409{
410 return iomode == IOMODE_RW ?
411 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
412}
413
414static void
415pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
416{
417 lo->plh_retry_timestamp = jiffies;
418 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
419 refcount_inc(&lo->plh_refcount);
420}
421
422static void
423pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
424{
425 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
426 refcount_dec(&lo->plh_refcount);
427}
428
429static void
430pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
431{
432 struct inode *inode = lo->plh_inode;
433 struct pnfs_layout_range range = {
434 .iomode = iomode,
435 .offset = 0,
436 .length = NFS4_MAX_UINT64,
437 };
438 LIST_HEAD(head);
439
440 spin_lock(&inode->i_lock);
441 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
442 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
443 spin_unlock(&inode->i_lock);
444 pnfs_free_lseg_list(&head);
445 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
446 iomode == IOMODE_RW ? "RW" : "READ");
447}
448
449static bool
450pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
451{
452 unsigned long start, end;
453 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
454
455 if (test_bit(fail_bit, &lo->plh_flags) == 0)
456 return false;
457 end = jiffies;
458 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
459 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
460 /* It is time to retry the failed layoutgets */
461 pnfs_layout_clear_fail_bit(lo, fail_bit);
462 return false;
463 }
464 return true;
465}
466
467static void
468pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
469 const struct pnfs_layout_range *range,
470 const nfs4_stateid *stateid)
471{
472 INIT_LIST_HEAD(&lseg->pls_list);
473 INIT_LIST_HEAD(&lseg->pls_lc_list);
474 refcount_set(&lseg->pls_refcount, 1);
475 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
476 lseg->pls_layout = lo;
477 lseg->pls_range = *range;
478 lseg->pls_seq = be32_to_cpu(stateid->seqid);
479}
480
481static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
482{
483 if (lseg != NULL) {
484 struct inode *inode = lseg->pls_layout->plh_inode;
485 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
486 }
487}
488
489static void
490pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
491 struct pnfs_layout_segment *lseg)
492{
493 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
494 list_del_init(&lseg->pls_list);
495 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
496 refcount_dec(&lo->plh_refcount);
497 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
498 return;
499 if (list_empty(&lo->plh_segs) &&
500 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
501 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
502 if (atomic_read(&lo->plh_outstanding) == 0)
503 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
504 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
505 }
506}
507
508static bool
509pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
510 struct pnfs_layout_segment *lseg)
511{
512 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
513 pnfs_layout_is_valid(lo)) {
514 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
515 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
516 return true;
517 }
518 return false;
519}
520
521void
522pnfs_put_lseg(struct pnfs_layout_segment *lseg)
523{
524 struct pnfs_layout_hdr *lo;
525 struct inode *inode;
526
527 if (!lseg)
528 return;
529
530 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
531 refcount_read(&lseg->pls_refcount),
532 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
533
534 lo = lseg->pls_layout;
535 inode = lo->plh_inode;
536
537 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
538 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
539 spin_unlock(&inode->i_lock);
540 return;
541 }
542 pnfs_get_layout_hdr(lo);
543 pnfs_layout_remove_lseg(lo, lseg);
544 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
545 lseg = NULL;
546 spin_unlock(&inode->i_lock);
547 pnfs_free_lseg(lseg);
548 pnfs_put_layout_hdr(lo);
549 }
550}
551EXPORT_SYMBOL_GPL(pnfs_put_lseg);
552
553/*
554 * is l2 fully contained in l1?
555 * start1 end1
556 * [----------------------------------)
557 * start2 end2
558 * [----------------)
559 */
560static bool
561pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
562 const struct pnfs_layout_range *l2)
563{
564 u64 start1 = l1->offset;
565 u64 end1 = pnfs_end_offset(start1, l1->length);
566 u64 start2 = l2->offset;
567 u64 end2 = pnfs_end_offset(start2, l2->length);
568
569 return (start1 <= start2) && (end1 >= end2);
570}
571
572static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
573 struct list_head *tmp_list)
574{
575 if (!refcount_dec_and_test(&lseg->pls_refcount))
576 return false;
577 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
578 list_add(&lseg->pls_list, tmp_list);
579 return true;
580}
581
582/* Returns 1 if lseg is removed from list, 0 otherwise */
583static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
584 struct list_head *tmp_list)
585{
586 int rv = 0;
587
588 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
589 /* Remove the reference keeping the lseg in the
590 * list. It will now be removed when all
591 * outstanding io is finished.
592 */
593 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
594 refcount_read(&lseg->pls_refcount));
595 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
596 rv = 1;
597 }
598 return rv;
599}
600
601/*
602 * Compare 2 layout stateid sequence ids, to see which is newer,
603 * taking into account wraparound issues.
604 */
605static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
606{
607 return (s32)(s1 - s2) > 0;
608}
609
610static bool
611pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
612 const struct pnfs_layout_range *recall_range)
613{
614 return (recall_range->iomode == IOMODE_ANY ||
615 lseg_range->iomode == recall_range->iomode) &&
616 pnfs_lseg_range_intersecting(lseg_range, recall_range);
617}
618
619static bool
620pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
621 const struct pnfs_layout_range *recall_range,
622 u32 seq)
623{
624 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
625 return false;
626 if (recall_range == NULL)
627 return true;
628 return pnfs_should_free_range(&lseg->pls_range, recall_range);
629}
630
631/**
632 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
633 * @lo: layout header containing the lsegs
634 * @tmp_list: list head where doomed lsegs should go
635 * @recall_range: optional recall range argument to match (may be NULL)
636 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
637 *
638 * Walk the list of lsegs in the layout header, and tear down any that should
639 * be destroyed. If "recall_range" is specified then the segment must match
640 * that range. If "seq" is non-zero, then only match segments that were handed
641 * out at or before that sequence.
642 *
643 * Returns number of matching invalid lsegs remaining in list after scanning
644 * it and purging them.
645 */
646int
647pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
648 struct list_head *tmp_list,
649 const struct pnfs_layout_range *recall_range,
650 u32 seq)
651{
652 struct pnfs_layout_segment *lseg, *next;
653 int remaining = 0;
654
655 dprintk("%s:Begin lo %p\n", __func__, lo);
656
657 if (list_empty(&lo->plh_segs))
658 return 0;
659 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
660 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
661 dprintk("%s: freeing lseg %p iomode %d seq %u "
662 "offset %llu length %llu\n", __func__,
663 lseg, lseg->pls_range.iomode, lseg->pls_seq,
664 lseg->pls_range.offset, lseg->pls_range.length);
665 if (!mark_lseg_invalid(lseg, tmp_list))
666 remaining++;
667 }
668 dprintk("%s:Return %i\n", __func__, remaining);
669 return remaining;
670}
671
672static void
673pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
674 struct list_head *free_me,
675 const struct pnfs_layout_range *range,
676 u32 seq)
677{
678 struct pnfs_layout_segment *lseg, *next;
679
680 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
681 if (pnfs_match_lseg_recall(lseg, range, seq))
682 list_move_tail(&lseg->pls_list, free_me);
683 }
684}
685
686/* note free_me must contain lsegs from a single layout_hdr */
687void
688pnfs_free_lseg_list(struct list_head *free_me)
689{
690 struct pnfs_layout_segment *lseg, *tmp;
691
692 if (list_empty(free_me))
693 return;
694
695 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
696 list_del(&lseg->pls_list);
697 pnfs_free_lseg(lseg);
698 }
699}
700
701void
702pnfs_destroy_layout(struct nfs_inode *nfsi)
703{
704 struct pnfs_layout_hdr *lo;
705 LIST_HEAD(tmp_list);
706
707 spin_lock(&nfsi->vfs_inode.i_lock);
708 lo = nfsi->layout;
709 if (lo) {
710 pnfs_get_layout_hdr(lo);
711 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
712 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
713 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
714 spin_unlock(&nfsi->vfs_inode.i_lock);
715 pnfs_free_lseg_list(&tmp_list);
716 nfs_commit_inode(&nfsi->vfs_inode, 0);
717 pnfs_put_layout_hdr(lo);
718 } else
719 spin_unlock(&nfsi->vfs_inode.i_lock);
720}
721EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
722
723static bool
724pnfs_layout_add_bulk_destroy_list(struct inode *inode,
725 struct list_head *layout_list)
726{
727 struct pnfs_layout_hdr *lo;
728 bool ret = false;
729
730 spin_lock(&inode->i_lock);
731 lo = NFS_I(inode)->layout;
732 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
733 pnfs_get_layout_hdr(lo);
734 list_add(&lo->plh_bulk_destroy, layout_list);
735 ret = true;
736 }
737 spin_unlock(&inode->i_lock);
738 return ret;
739}
740
741/* Caller must hold rcu_read_lock and clp->cl_lock */
742static int
743pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
744 struct nfs_server *server,
745 struct list_head *layout_list)
746{
747 struct pnfs_layout_hdr *lo, *next;
748 struct inode *inode;
749
750 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
751 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
752 continue;
753 inode = igrab(lo->plh_inode);
754 if (inode == NULL)
755 continue;
756 list_del_init(&lo->plh_layouts);
757 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
758 continue;
759 rcu_read_unlock();
760 spin_unlock(&clp->cl_lock);
761 iput(inode);
762 spin_lock(&clp->cl_lock);
763 rcu_read_lock();
764 return -EAGAIN;
765 }
766 return 0;
767}
768
769static int
770pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
771 bool is_bulk_recall)
772{
773 struct pnfs_layout_hdr *lo;
774 struct inode *inode;
775 LIST_HEAD(lseg_list);
776 int ret = 0;
777
778 while (!list_empty(layout_list)) {
779 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
780 plh_bulk_destroy);
781 dprintk("%s freeing layout for inode %lu\n", __func__,
782 lo->plh_inode->i_ino);
783 inode = lo->plh_inode;
784
785 pnfs_layoutcommit_inode(inode, false);
786
787 spin_lock(&inode->i_lock);
788 list_del_init(&lo->plh_bulk_destroy);
789 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
790 if (is_bulk_recall)
791 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
792 ret = -EAGAIN;
793 }
794 spin_unlock(&inode->i_lock);
795 pnfs_free_lseg_list(&lseg_list);
796 /* Free all lsegs that are attached to commit buckets */
797 nfs_commit_inode(inode, 0);
798 pnfs_put_layout_hdr(lo);
799 iput(inode);
800 }
801 return ret;
802}
803
804int
805pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
806 struct nfs_fsid *fsid,
807 bool is_recall)
808{
809 struct nfs_server *server;
810 LIST_HEAD(layout_list);
811
812 spin_lock(&clp->cl_lock);
813 rcu_read_lock();
814restart:
815 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
816 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
817 continue;
818 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
819 server,
820 &layout_list) != 0)
821 goto restart;
822 }
823 rcu_read_unlock();
824 spin_unlock(&clp->cl_lock);
825
826 if (list_empty(&layout_list))
827 return 0;
828 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
829}
830
831int
832pnfs_destroy_layouts_byclid(struct nfs_client *clp,
833 bool is_recall)
834{
835 struct nfs_server *server;
836 LIST_HEAD(layout_list);
837
838 spin_lock(&clp->cl_lock);
839 rcu_read_lock();
840restart:
841 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
842 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
843 server,
844 &layout_list) != 0)
845 goto restart;
846 }
847 rcu_read_unlock();
848 spin_unlock(&clp->cl_lock);
849
850 if (list_empty(&layout_list))
851 return 0;
852 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
853}
854
855/*
856 * Called by the state manger to remove all layouts established under an
857 * expired lease.
858 */
859void
860pnfs_destroy_all_layouts(struct nfs_client *clp)
861{
862 nfs4_deviceid_mark_client_invalid(clp);
863 nfs4_deviceid_purge_client(clp);
864
865 pnfs_destroy_layouts_byclid(clp, false);
866}
867
868/* update lo->plh_stateid with new if is more recent */
869void
870pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
871 bool update_barrier)
872{
873 u32 oldseq, newseq, new_barrier = 0;
874
875 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
876 newseq = be32_to_cpu(new->seqid);
877
878 if (!pnfs_layout_is_valid(lo)) {
879 nfs4_stateid_copy(&lo->plh_stateid, new);
880 lo->plh_barrier = newseq;
881 pnfs_clear_layoutreturn_info(lo);
882 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
883 return;
884 }
885 if (pnfs_seqid_is_newer(newseq, oldseq)) {
886 nfs4_stateid_copy(&lo->plh_stateid, new);
887 /*
888 * Because of wraparound, we want to keep the barrier
889 * "close" to the current seqids.
890 */
891 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
892 }
893 if (update_barrier)
894 new_barrier = be32_to_cpu(new->seqid);
895 else if (new_barrier == 0)
896 return;
897 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
898 lo->plh_barrier = new_barrier;
899}
900
901static bool
902pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
903 const nfs4_stateid *stateid)
904{
905 u32 seqid = be32_to_cpu(stateid->seqid);
906
907 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
908}
909
910/* lget is set to 1 if called from inside send_layoutget call chain */
911static bool
912pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
913{
914 return lo->plh_block_lgets ||
915 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
916}
917
918/*
919 * Get layout from server.
920 * for now, assume that whole file layouts are requested.
921 * arg->offset: 0
922 * arg->length: all ones
923 */
924static struct pnfs_layout_segment *
925send_layoutget(struct pnfs_layout_hdr *lo,
926 struct nfs_open_context *ctx,
927 nfs4_stateid *stateid,
928 const struct pnfs_layout_range *range,
929 long *timeout, gfp_t gfp_flags)
930{
931 struct inode *ino = lo->plh_inode;
932 struct nfs_server *server = NFS_SERVER(ino);
933 struct nfs4_layoutget *lgp;
934 loff_t i_size;
935
936 dprintk("--> %s\n", __func__);
937
938 /*
939 * Synchronously retrieve layout information from server and
940 * store in lseg. If we race with a concurrent seqid morphing
941 * op, then re-send the LAYOUTGET.
942 */
943 lgp = kzalloc(sizeof(*lgp), gfp_flags);
944 if (lgp == NULL)
945 return ERR_PTR(-ENOMEM);
946
947 i_size = i_size_read(ino);
948
949 lgp->args.minlength = PAGE_SIZE;
950 if (lgp->args.minlength > range->length)
951 lgp->args.minlength = range->length;
952 if (range->iomode == IOMODE_READ) {
953 if (range->offset >= i_size)
954 lgp->args.minlength = 0;
955 else if (i_size - range->offset < lgp->args.minlength)
956 lgp->args.minlength = i_size - range->offset;
957 }
958 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
959 pnfs_copy_range(&lgp->args.range, range);
960 lgp->args.type = server->pnfs_curr_ld->id;
961 lgp->args.inode = ino;
962 lgp->args.ctx = get_nfs_open_context(ctx);
963 nfs4_stateid_copy(&lgp->args.stateid, stateid);
964 lgp->gfp_flags = gfp_flags;
965 lgp->cred = lo->plh_lc_cred;
966
967 return nfs4_proc_layoutget(lgp, timeout, gfp_flags);
968}
969
970static void pnfs_clear_layoutcommit(struct inode *inode,
971 struct list_head *head)
972{
973 struct nfs_inode *nfsi = NFS_I(inode);
974 struct pnfs_layout_segment *lseg, *tmp;
975
976 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
977 return;
978 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
979 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
980 continue;
981 pnfs_lseg_dec_and_remove_zero(lseg, head);
982 }
983}
984
985void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
986 const nfs4_stateid *arg_stateid,
987 const struct pnfs_layout_range *range,
988 const nfs4_stateid *stateid)
989{
990 struct inode *inode = lo->plh_inode;
991 LIST_HEAD(freeme);
992
993 spin_lock(&inode->i_lock);
994 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
995 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
996 goto out_unlock;
997 if (stateid) {
998 u32 seq = be32_to_cpu(arg_stateid->seqid);
999
1000 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1001 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1002 pnfs_set_layout_stateid(lo, stateid, true);
1003 } else
1004 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1005out_unlock:
1006 pnfs_clear_layoutreturn_waitbit(lo);
1007 spin_unlock(&inode->i_lock);
1008 pnfs_free_lseg_list(&freeme);
1009
1010}
1011
1012static bool
1013pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1014 nfs4_stateid *stateid,
1015 enum pnfs_iomode *iomode)
1016{
1017 /* Serialise LAYOUTGET/LAYOUTRETURN */
1018 if (atomic_read(&lo->plh_outstanding) != 0)
1019 return false;
1020 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1021 return false;
1022 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1023 pnfs_get_layout_hdr(lo);
1024 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1025 if (stateid != NULL) {
1026 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1027 if (lo->plh_return_seq != 0)
1028 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1029 }
1030 if (iomode != NULL)
1031 *iomode = lo->plh_return_iomode;
1032 pnfs_clear_layoutreturn_info(lo);
1033 return true;
1034 }
1035 if (stateid != NULL)
1036 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1037 if (iomode != NULL)
1038 *iomode = IOMODE_ANY;
1039 return true;
1040}
1041
1042static void
1043pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1044 struct pnfs_layout_hdr *lo,
1045 const nfs4_stateid *stateid,
1046 enum pnfs_iomode iomode)
1047{
1048 struct inode *inode = lo->plh_inode;
1049
1050 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1051 args->inode = inode;
1052 args->range.iomode = iomode;
1053 args->range.offset = 0;
1054 args->range.length = NFS4_MAX_UINT64;
1055 args->layout = lo;
1056 nfs4_stateid_copy(&args->stateid, stateid);
1057}
1058
1059static int
1060pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
1061 enum pnfs_iomode iomode, bool sync)
1062{
1063 struct inode *ino = lo->plh_inode;
1064 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1065 struct nfs4_layoutreturn *lrp;
1066 int status = 0;
1067
1068 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1069 if (unlikely(lrp == NULL)) {
1070 status = -ENOMEM;
1071 spin_lock(&ino->i_lock);
1072 pnfs_clear_layoutreturn_waitbit(lo);
1073 spin_unlock(&ino->i_lock);
1074 pnfs_put_layout_hdr(lo);
1075 goto out;
1076 }
1077
1078 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1079 lrp->args.ld_private = &lrp->ld_private;
1080 lrp->clp = NFS_SERVER(ino)->nfs_client;
1081 lrp->cred = lo->plh_lc_cred;
1082 if (ld->prepare_layoutreturn)
1083 ld->prepare_layoutreturn(&lrp->args);
1084
1085 status = nfs4_proc_layoutreturn(lrp, sync);
1086out:
1087 dprintk("<-- %s status: %d\n", __func__, status);
1088 return status;
1089}
1090
1091/* Return true if layoutreturn is needed */
1092static bool
1093pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1094{
1095 struct pnfs_layout_segment *s;
1096
1097 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1098 return false;
1099
1100 /* Defer layoutreturn until all lsegs are done */
1101 list_for_each_entry(s, &lo->plh_segs, pls_list) {
1102 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1103 return false;
1104 }
1105
1106 return true;
1107}
1108
1109static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1110{
1111 struct inode *inode= lo->plh_inode;
1112
1113 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1114 return;
1115 spin_lock(&inode->i_lock);
1116 if (pnfs_layout_need_return(lo)) {
1117 nfs4_stateid stateid;
1118 enum pnfs_iomode iomode;
1119 bool send;
1120
1121 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1122 spin_unlock(&inode->i_lock);
1123 if (send) {
1124 /* Send an async layoutreturn so we dont deadlock */
1125 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1126 }
1127 } else
1128 spin_unlock(&inode->i_lock);
1129}
1130
1131/*
1132 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1133 * when the layout segment list is empty.
1134 *
1135 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1136 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1137 * deviceid is marked invalid.
1138 */
1139int
1140_pnfs_return_layout(struct inode *ino)
1141{
1142 struct pnfs_layout_hdr *lo = NULL;
1143 struct nfs_inode *nfsi = NFS_I(ino);
1144 LIST_HEAD(tmp_list);
1145 nfs4_stateid stateid;
1146 int status = 0;
1147 bool send;
1148
1149 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1150
1151 spin_lock(&ino->i_lock);
1152 lo = nfsi->layout;
1153 if (!lo) {
1154 spin_unlock(&ino->i_lock);
1155 dprintk("NFS: %s no layout to return\n", __func__);
1156 goto out;
1157 }
1158 /* Reference matched in nfs4_layoutreturn_release */
1159 pnfs_get_layout_hdr(lo);
1160 /* Is there an outstanding layoutreturn ? */
1161 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1162 spin_unlock(&ino->i_lock);
1163 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1164 TASK_UNINTERRUPTIBLE))
1165 goto out_put_layout_hdr;
1166 spin_lock(&ino->i_lock);
1167 }
1168 pnfs_clear_layoutcommit(ino, &tmp_list);
1169 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1170
1171 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1172 struct pnfs_layout_range range = {
1173 .iomode = IOMODE_ANY,
1174 .offset = 0,
1175 .length = NFS4_MAX_UINT64,
1176 };
1177 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1178 }
1179
1180 /* Don't send a LAYOUTRETURN if list was initially empty */
1181 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1182 spin_unlock(&ino->i_lock);
1183 dprintk("NFS: %s no layout segments to return\n", __func__);
1184 goto out_put_layout_hdr;
1185 }
1186
1187 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
1188 spin_unlock(&ino->i_lock);
1189 if (send)
1190 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1191out_put_layout_hdr:
1192 pnfs_free_lseg_list(&tmp_list);
1193 pnfs_put_layout_hdr(lo);
1194out:
1195 dprintk("<-- %s status: %d\n", __func__, status);
1196 return status;
1197}
1198
1199int
1200pnfs_commit_and_return_layout(struct inode *inode)
1201{
1202 struct pnfs_layout_hdr *lo;
1203 int ret;
1204
1205 spin_lock(&inode->i_lock);
1206 lo = NFS_I(inode)->layout;
1207 if (lo == NULL) {
1208 spin_unlock(&inode->i_lock);
1209 return 0;
1210 }
1211 pnfs_get_layout_hdr(lo);
1212 /* Block new layoutgets and read/write to ds */
1213 lo->plh_block_lgets++;
1214 spin_unlock(&inode->i_lock);
1215 filemap_fdatawait(inode->i_mapping);
1216 ret = pnfs_layoutcommit_inode(inode, true);
1217 if (ret == 0)
1218 ret = _pnfs_return_layout(inode);
1219 spin_lock(&inode->i_lock);
1220 lo->plh_block_lgets--;
1221 spin_unlock(&inode->i_lock);
1222 pnfs_put_layout_hdr(lo);
1223 return ret;
1224}
1225
1226bool pnfs_roc(struct inode *ino,
1227 struct nfs4_layoutreturn_args *args,
1228 struct nfs4_layoutreturn_res *res,
1229 const struct rpc_cred *cred)
1230{
1231 struct nfs_inode *nfsi = NFS_I(ino);
1232 struct nfs_open_context *ctx;
1233 struct nfs4_state *state;
1234 struct pnfs_layout_hdr *lo;
1235 struct pnfs_layout_segment *lseg, *next;
1236 nfs4_stateid stateid;
1237 enum pnfs_iomode iomode = 0;
1238 bool layoutreturn = false, roc = false;
1239 bool skip_read = false;
1240
1241 if (!nfs_have_layout(ino))
1242 return false;
1243retry:
1244 spin_lock(&ino->i_lock);
1245 lo = nfsi->layout;
1246 if (!lo || !pnfs_layout_is_valid(lo) ||
1247 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1248 lo = NULL;
1249 goto out_noroc;
1250 }
1251 pnfs_get_layout_hdr(lo);
1252 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1253 spin_unlock(&ino->i_lock);
1254 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1255 TASK_UNINTERRUPTIBLE);
1256 pnfs_put_layout_hdr(lo);
1257 goto retry;
1258 }
1259
1260 /* no roc if we hold a delegation */
1261 if (nfs4_check_delegation(ino, FMODE_READ)) {
1262 if (nfs4_check_delegation(ino, FMODE_WRITE))
1263 goto out_noroc;
1264 skip_read = true;
1265 }
1266
1267 list_for_each_entry(ctx, &nfsi->open_files, list) {
1268 state = ctx->state;
1269 if (state == NULL)
1270 continue;
1271 /* Don't return layout if there is open file state */
1272 if (state->state & FMODE_WRITE)
1273 goto out_noroc;
1274 if (state->state & FMODE_READ)
1275 skip_read = true;
1276 }
1277
1278
1279 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1280 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1281 continue;
1282 /* If we are sending layoutreturn, invalidate all valid lsegs */
1283 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1284 continue;
1285 /*
1286 * Note: mark lseg for return so pnfs_layout_remove_lseg
1287 * doesn't invalidate the layout for us.
1288 */
1289 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1290 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1291 continue;
1292 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1293 }
1294
1295 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1296 goto out_noroc;
1297
1298 /* ROC in two conditions:
1299 * 1. there are ROC lsegs
1300 * 2. we don't send layoutreturn
1301 */
1302 /* lo ref dropped in pnfs_roc_release() */
1303 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1304 /* If the creds don't match, we can't compound the layoutreturn */
1305 if (!layoutreturn || cred != lo->plh_lc_cred)
1306 goto out_noroc;
1307
1308 roc = layoutreturn;
1309 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1310 res->lrs_present = 0;
1311 layoutreturn = false;
1312
1313out_noroc:
1314 spin_unlock(&ino->i_lock);
1315 pnfs_layoutcommit_inode(ino, true);
1316 if (roc) {
1317 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1318 if (ld->prepare_layoutreturn)
1319 ld->prepare_layoutreturn(args);
1320 pnfs_put_layout_hdr(lo);
1321 return true;
1322 }
1323 if (layoutreturn)
1324 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
1325 pnfs_put_layout_hdr(lo);
1326 return false;
1327}
1328
1329void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1330 struct nfs4_layoutreturn_res *res,
1331 int ret)
1332{
1333 struct pnfs_layout_hdr *lo = args->layout;
1334 const nfs4_stateid *arg_stateid = NULL;
1335 const nfs4_stateid *res_stateid = NULL;
1336 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1337
1338 if (ret == 0) {
1339 arg_stateid = &args->stateid;
1340 if (res->lrs_present)
1341 res_stateid = &res->stateid;
1342 }
1343 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1344 res_stateid);
1345 if (ld_private && ld_private->ops && ld_private->ops->free)
1346 ld_private->ops->free(ld_private);
1347 pnfs_put_layout_hdr(lo);
1348 trace_nfs4_layoutreturn_on_close(args->inode, 0);
1349}
1350
1351bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1352{
1353 struct nfs_inode *nfsi = NFS_I(ino);
1354 struct pnfs_layout_hdr *lo;
1355 bool sleep = false;
1356
1357 /* we might not have grabbed lo reference. so need to check under
1358 * i_lock */
1359 spin_lock(&ino->i_lock);
1360 lo = nfsi->layout;
1361 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1362 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1363 sleep = true;
1364 }
1365 spin_unlock(&ino->i_lock);
1366 return sleep;
1367}
1368
1369/*
1370 * Compare two layout segments for sorting into layout cache.
1371 * We want to preferentially return RW over RO layouts, so ensure those
1372 * are seen first.
1373 */
1374static s64
1375pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1376 const struct pnfs_layout_range *l2)
1377{
1378 s64 d;
1379
1380 /* high offset > low offset */
1381 d = l1->offset - l2->offset;
1382 if (d)
1383 return d;
1384
1385 /* short length > long length */
1386 d = l2->length - l1->length;
1387 if (d)
1388 return d;
1389
1390 /* read > read/write */
1391 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1392}
1393
1394static bool
1395pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1396 const struct pnfs_layout_range *l2)
1397{
1398 return pnfs_lseg_range_cmp(l1, l2) > 0;
1399}
1400
1401static bool
1402pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1403 struct pnfs_layout_segment *old)
1404{
1405 return false;
1406}
1407
1408void
1409pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1410 struct pnfs_layout_segment *lseg,
1411 bool (*is_after)(const struct pnfs_layout_range *,
1412 const struct pnfs_layout_range *),
1413 bool (*do_merge)(struct pnfs_layout_segment *,
1414 struct pnfs_layout_segment *),
1415 struct list_head *free_me)
1416{
1417 struct pnfs_layout_segment *lp, *tmp;
1418
1419 dprintk("%s:Begin\n", __func__);
1420
1421 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1422 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1423 continue;
1424 if (do_merge(lseg, lp)) {
1425 mark_lseg_invalid(lp, free_me);
1426 continue;
1427 }
1428 if (is_after(&lseg->pls_range, &lp->pls_range))
1429 continue;
1430 list_add_tail(&lseg->pls_list, &lp->pls_list);
1431 dprintk("%s: inserted lseg %p "
1432 "iomode %d offset %llu length %llu before "
1433 "lp %p iomode %d offset %llu length %llu\n",
1434 __func__, lseg, lseg->pls_range.iomode,
1435 lseg->pls_range.offset, lseg->pls_range.length,
1436 lp, lp->pls_range.iomode, lp->pls_range.offset,
1437 lp->pls_range.length);
1438 goto out;
1439 }
1440 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1441 dprintk("%s: inserted lseg %p "
1442 "iomode %d offset %llu length %llu at tail\n",
1443 __func__, lseg, lseg->pls_range.iomode,
1444 lseg->pls_range.offset, lseg->pls_range.length);
1445out:
1446 pnfs_get_layout_hdr(lo);
1447
1448 dprintk("%s:Return\n", __func__);
1449}
1450EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1451
1452static void
1453pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1454 struct pnfs_layout_segment *lseg,
1455 struct list_head *free_me)
1456{
1457 struct inode *inode = lo->plh_inode;
1458 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1459
1460 if (ld->add_lseg != NULL)
1461 ld->add_lseg(lo, lseg, free_me);
1462 else
1463 pnfs_generic_layout_insert_lseg(lo, lseg,
1464 pnfs_lseg_range_is_after,
1465 pnfs_lseg_no_merge,
1466 free_me);
1467}
1468
1469static struct pnfs_layout_hdr *
1470alloc_init_layout_hdr(struct inode *ino,
1471 struct nfs_open_context *ctx,
1472 gfp_t gfp_flags)
1473{
1474 struct pnfs_layout_hdr *lo;
1475
1476 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1477 if (!lo)
1478 return NULL;
1479 refcount_set(&lo->plh_refcount, 1);
1480 INIT_LIST_HEAD(&lo->plh_layouts);
1481 INIT_LIST_HEAD(&lo->plh_segs);
1482 INIT_LIST_HEAD(&lo->plh_return_segs);
1483 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1484 lo->plh_inode = ino;
1485 lo->plh_lc_cred = get_rpccred(ctx->cred);
1486 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1487 return lo;
1488}
1489
1490static struct pnfs_layout_hdr *
1491pnfs_find_alloc_layout(struct inode *ino,
1492 struct nfs_open_context *ctx,
1493 gfp_t gfp_flags)
1494 __releases(&ino->i_lock)
1495 __acquires(&ino->i_lock)
1496{
1497 struct nfs_inode *nfsi = NFS_I(ino);
1498 struct pnfs_layout_hdr *new = NULL;
1499
1500 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1501
1502 if (nfsi->layout != NULL)
1503 goto out_existing;
1504 spin_unlock(&ino->i_lock);
1505 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1506 spin_lock(&ino->i_lock);
1507
1508 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1509 nfsi->layout = new;
1510 return new;
1511 } else if (new != NULL)
1512 pnfs_free_layout_hdr(new);
1513out_existing:
1514 pnfs_get_layout_hdr(nfsi->layout);
1515 return nfsi->layout;
1516}
1517
1518/*
1519 * iomode matching rules:
1520 * iomode lseg strict match
1521 * iomode
1522 * ----- ----- ------ -----
1523 * ANY READ N/A true
1524 * ANY RW N/A true
1525 * RW READ N/A false
1526 * RW RW N/A true
1527 * READ READ N/A true
1528 * READ RW true false
1529 * READ RW false true
1530 */
1531static bool
1532pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1533 const struct pnfs_layout_range *range,
1534 bool strict_iomode)
1535{
1536 struct pnfs_layout_range range1;
1537
1538 if ((range->iomode == IOMODE_RW &&
1539 ls_range->iomode != IOMODE_RW) ||
1540 (range->iomode != ls_range->iomode &&
1541 strict_iomode) ||
1542 !pnfs_lseg_range_intersecting(ls_range, range))
1543 return 0;
1544
1545 /* range1 covers only the first byte in the range */
1546 range1 = *range;
1547 range1.length = 1;
1548 return pnfs_lseg_range_contained(ls_range, &range1);
1549}
1550
1551/*
1552 * lookup range in layout
1553 */
1554static struct pnfs_layout_segment *
1555pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1556 struct pnfs_layout_range *range,
1557 bool strict_iomode)
1558{
1559 struct pnfs_layout_segment *lseg, *ret = NULL;
1560
1561 dprintk("%s:Begin\n", __func__);
1562
1563 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1564 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1565 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1566 pnfs_lseg_range_match(&lseg->pls_range, range,
1567 strict_iomode)) {
1568 ret = pnfs_get_lseg(lseg);
1569 break;
1570 }
1571 }
1572
1573 dprintk("%s:Return lseg %p ref %d\n",
1574 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1575 return ret;
1576}
1577
1578/*
1579 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1580 * to the MDS or over pNFS
1581 *
1582 * The nfs_inode read_io and write_io fields are cumulative counters reset
1583 * when there are no layout segments. Note that in pnfs_update_layout iomode
1584 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1585 * WRITE request.
1586 *
1587 * A return of true means use MDS I/O.
1588 *
1589 * From rfc 5661:
1590 * If a file's size is smaller than the file size threshold, data accesses
1591 * SHOULD be sent to the metadata server. If an I/O request has a length that
1592 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1593 * server. If both file size and I/O size are provided, the client SHOULD
1594 * reach or exceed both thresholds before sending its read or write
1595 * requests to the data server.
1596 */
1597static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1598 struct inode *ino, int iomode)
1599{
1600 struct nfs4_threshold *t = ctx->mdsthreshold;
1601 struct nfs_inode *nfsi = NFS_I(ino);
1602 loff_t fsize = i_size_read(ino);
1603 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1604
1605 if (t == NULL)
1606 return ret;
1607
1608 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1609 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1610
1611 switch (iomode) {
1612 case IOMODE_READ:
1613 if (t->bm & THRESHOLD_RD) {
1614 dprintk("%s fsize %llu\n", __func__, fsize);
1615 size_set = true;
1616 if (fsize < t->rd_sz)
1617 size = true;
1618 }
1619 if (t->bm & THRESHOLD_RD_IO) {
1620 dprintk("%s nfsi->read_io %llu\n", __func__,
1621 nfsi->read_io);
1622 io_set = true;
1623 if (nfsi->read_io < t->rd_io_sz)
1624 io = true;
1625 }
1626 break;
1627 case IOMODE_RW:
1628 if (t->bm & THRESHOLD_WR) {
1629 dprintk("%s fsize %llu\n", __func__, fsize);
1630 size_set = true;
1631 if (fsize < t->wr_sz)
1632 size = true;
1633 }
1634 if (t->bm & THRESHOLD_WR_IO) {
1635 dprintk("%s nfsi->write_io %llu\n", __func__,
1636 nfsi->write_io);
1637 io_set = true;
1638 if (nfsi->write_io < t->wr_io_sz)
1639 io = true;
1640 }
1641 break;
1642 }
1643 if (size_set && io_set) {
1644 if (size && io)
1645 ret = true;
1646 } else if (size || io)
1647 ret = true;
1648
1649 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1650 return ret;
1651}
1652
1653static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1654{
1655 /*
1656 * send layoutcommit as it can hold up layoutreturn due to lseg
1657 * reference
1658 */
1659 pnfs_layoutcommit_inode(lo->plh_inode, false);
1660 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1661 nfs_wait_bit_killable,
1662 TASK_UNINTERRUPTIBLE);
1663}
1664
1665static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1666{
1667 unsigned long *bitlock = &lo->plh_flags;
1668
1669 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1670 smp_mb__after_atomic();
1671 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1672}
1673
1674/*
1675 * Layout segment is retreived from the server if not cached.
1676 * The appropriate layout segment is referenced and returned to the caller.
1677 */
1678struct pnfs_layout_segment *
1679pnfs_update_layout(struct inode *ino,
1680 struct nfs_open_context *ctx,
1681 loff_t pos,
1682 u64 count,
1683 enum pnfs_iomode iomode,
1684 bool strict_iomode,
1685 gfp_t gfp_flags)
1686{
1687 struct pnfs_layout_range arg = {
1688 .iomode = iomode,
1689 .offset = pos,
1690 .length = count,
1691 };
1692 unsigned pg_offset;
1693 struct nfs_server *server = NFS_SERVER(ino);
1694 struct nfs_client *clp = server->nfs_client;
1695 struct pnfs_layout_hdr *lo = NULL;
1696 struct pnfs_layout_segment *lseg = NULL;
1697 nfs4_stateid stateid;
1698 long timeout = 0;
1699 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1700 bool first;
1701
1702 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1703 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1704 PNFS_UPDATE_LAYOUT_NO_PNFS);
1705 goto out;
1706 }
1707
1708 if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1709 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1710 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1711 goto out;
1712 }
1713
1714 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1715 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1716 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1717 goto out;
1718 }
1719
1720lookup_again:
1721 nfs4_client_recover_expired_lease(clp);
1722 first = false;
1723 spin_lock(&ino->i_lock);
1724 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1725 if (lo == NULL) {
1726 spin_unlock(&ino->i_lock);
1727 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1728 PNFS_UPDATE_LAYOUT_NOMEM);
1729 goto out;
1730 }
1731
1732 /* Do we even need to bother with this? */
1733 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1734 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1735 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1736 dprintk("%s matches recall, use MDS\n", __func__);
1737 goto out_unlock;
1738 }
1739
1740 /* if LAYOUTGET already failed once we don't try again */
1741 if (pnfs_layout_io_test_failed(lo, iomode)) {
1742 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1743 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1744 goto out_unlock;
1745 }
1746
1747 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1748 if (lseg) {
1749 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1750 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1751 goto out_unlock;
1752 }
1753
1754 if (!nfs4_valid_open_stateid(ctx->state)) {
1755 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1756 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1757 goto out_unlock;
1758 }
1759
1760 /*
1761 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1762 * stateid, or it has been invalidated, then we must use the open
1763 * stateid.
1764 */
1765 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
1766
1767 /*
1768 * The first layoutget for the file. Need to serialize per
1769 * RFC 5661 Errata 3208.
1770 */
1771 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1772 &lo->plh_flags)) {
1773 spin_unlock(&ino->i_lock);
1774 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1775 TASK_UNINTERRUPTIBLE);
1776 pnfs_put_layout_hdr(lo);
1777 dprintk("%s retrying\n", __func__);
1778 goto lookup_again;
1779 }
1780
1781 first = true;
1782 if (nfs4_select_rw_stateid(ctx->state,
1783 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
1784 NULL, &stateid, NULL) != 0) {
1785 trace_pnfs_update_layout(ino, pos, count,
1786 iomode, lo, lseg,
1787 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1788 goto out_unlock;
1789 }
1790 } else {
1791 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1792 }
1793
1794 /*
1795 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1796 * for LAYOUTRETURN even if first is true.
1797 */
1798 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1799 spin_unlock(&ino->i_lock);
1800 dprintk("%s wait for layoutreturn\n", __func__);
1801 if (pnfs_prepare_to_retry_layoutget(lo)) {
1802 if (first)
1803 pnfs_clear_first_layoutget(lo);
1804 pnfs_put_layout_hdr(lo);
1805 dprintk("%s retrying\n", __func__);
1806 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1807 lseg, PNFS_UPDATE_LAYOUT_RETRY);
1808 goto lookup_again;
1809 }
1810 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1811 PNFS_UPDATE_LAYOUT_RETURN);
1812 goto out_put_layout_hdr;
1813 }
1814
1815 if (pnfs_layoutgets_blocked(lo)) {
1816 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1817 PNFS_UPDATE_LAYOUT_BLOCKED);
1818 goto out_unlock;
1819 }
1820 atomic_inc(&lo->plh_outstanding);
1821 spin_unlock(&ino->i_lock);
1822
1823 if (list_empty(&lo->plh_layouts)) {
1824 /* The lo must be on the clp list if there is any
1825 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1826 */
1827 spin_lock(&clp->cl_lock);
1828 if (list_empty(&lo->plh_layouts))
1829 list_add_tail(&lo->plh_layouts, &server->layouts);
1830 spin_unlock(&clp->cl_lock);
1831 }
1832
1833 pg_offset = arg.offset & ~PAGE_MASK;
1834 if (pg_offset) {
1835 arg.offset -= pg_offset;
1836 arg.length += pg_offset;
1837 }
1838 if (arg.length != NFS4_MAX_UINT64)
1839 arg.length = PAGE_ALIGN(arg.length);
1840
1841 lseg = send_layoutget(lo, ctx, &stateid, &arg, &timeout, gfp_flags);
1842 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1843 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1844 atomic_dec(&lo->plh_outstanding);
1845 if (IS_ERR(lseg)) {
1846 switch(PTR_ERR(lseg)) {
1847 case -EBUSY:
1848 if (time_after(jiffies, giveup))
1849 lseg = NULL;
1850 break;
1851 case -ERECALLCONFLICT:
1852 /* Huh? We hold no layouts, how is there a recall? */
1853 if (first) {
1854 lseg = NULL;
1855 break;
1856 }
1857 /* Destroy the existing layout and start over */
1858 if (time_after(jiffies, giveup))
1859 pnfs_destroy_layout(NFS_I(ino));
1860 /* Fallthrough */
1861 case -EAGAIN:
1862 break;
1863 default:
1864 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
1865 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1866 lseg = NULL;
1867 }
1868 goto out_put_layout_hdr;
1869 }
1870 if (lseg) {
1871 if (first)
1872 pnfs_clear_first_layoutget(lo);
1873 trace_pnfs_update_layout(ino, pos, count,
1874 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
1875 pnfs_put_layout_hdr(lo);
1876 goto lookup_again;
1877 }
1878 } else {
1879 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1880 }
1881
1882out_put_layout_hdr:
1883 if (first)
1884 pnfs_clear_first_layoutget(lo);
1885 pnfs_put_layout_hdr(lo);
1886out:
1887 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1888 "(%s, offset: %llu, length: %llu)\n",
1889 __func__, ino->i_sb->s_id,
1890 (unsigned long long)NFS_FILEID(ino),
1891 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1892 iomode==IOMODE_RW ? "read/write" : "read-only",
1893 (unsigned long long)pos,
1894 (unsigned long long)count);
1895 return lseg;
1896out_unlock:
1897 spin_unlock(&ino->i_lock);
1898 goto out_put_layout_hdr;
1899}
1900EXPORT_SYMBOL_GPL(pnfs_update_layout);
1901
1902static bool
1903pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1904{
1905 switch (range->iomode) {
1906 case IOMODE_READ:
1907 case IOMODE_RW:
1908 break;
1909 default:
1910 return false;
1911 }
1912 if (range->offset == NFS4_MAX_UINT64)
1913 return false;
1914 if (range->length == 0)
1915 return false;
1916 if (range->length != NFS4_MAX_UINT64 &&
1917 range->length > NFS4_MAX_UINT64 - range->offset)
1918 return false;
1919 return true;
1920}
1921
1922struct pnfs_layout_segment *
1923pnfs_layout_process(struct nfs4_layoutget *lgp)
1924{
1925 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1926 struct nfs4_layoutget_res *res = &lgp->res;
1927 struct pnfs_layout_segment *lseg;
1928 struct inode *ino = lo->plh_inode;
1929 LIST_HEAD(free_me);
1930
1931 if (!pnfs_sanity_check_layout_range(&res->range))
1932 return ERR_PTR(-EINVAL);
1933
1934 /* Inject layout blob into I/O device driver */
1935 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1936 if (IS_ERR_OR_NULL(lseg)) {
1937 if (!lseg)
1938 lseg = ERR_PTR(-ENOMEM);
1939
1940 dprintk("%s: Could not allocate layout: error %ld\n",
1941 __func__, PTR_ERR(lseg));
1942 return lseg;
1943 }
1944
1945 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
1946
1947 spin_lock(&ino->i_lock);
1948 if (pnfs_layoutgets_blocked(lo)) {
1949 dprintk("%s forget reply due to state\n", __func__);
1950 goto out_forget;
1951 }
1952
1953 if (!pnfs_layout_is_valid(lo)) {
1954 /* We have a completely new layout */
1955 pnfs_set_layout_stateid(lo, &res->stateid, true);
1956 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1957 /* existing state ID, make sure the sequence number matches. */
1958 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1959 dprintk("%s forget reply due to sequence\n", __func__);
1960 goto out_forget;
1961 }
1962 pnfs_set_layout_stateid(lo, &res->stateid, false);
1963 } else {
1964 /*
1965 * We got an entirely new state ID. Mark all segments for the
1966 * inode invalid, and retry the layoutget
1967 */
1968 pnfs_mark_layout_stateid_invalid(lo, &free_me);
1969 goto out_forget;
1970 }
1971
1972 pnfs_get_lseg(lseg);
1973 pnfs_layout_insert_lseg(lo, lseg, &free_me);
1974
1975
1976 if (res->return_on_close)
1977 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1978
1979 spin_unlock(&ino->i_lock);
1980 pnfs_free_lseg_list(&free_me);
1981 return lseg;
1982
1983out_forget:
1984 spin_unlock(&ino->i_lock);
1985 lseg->pls_layout = lo;
1986 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1987 if (!pnfs_layout_is_valid(lo))
1988 nfs_commit_inode(ino, 0);
1989 return ERR_PTR(-EAGAIN);
1990}
1991
1992/**
1993 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1994 * @lo: pointer to layout header
1995 * @tmp_list: list header to be used with pnfs_free_lseg_list()
1996 * @return_range: describe layout segment ranges to be returned
1997 *
1998 * This function is mainly intended for use by layoutrecall. It attempts
1999 * to free the layout segment immediately, or else to mark it for return
2000 * as soon as its reference count drops to zero.
2001 */
2002int
2003pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2004 struct list_head *tmp_list,
2005 const struct pnfs_layout_range *return_range,
2006 u32 seq)
2007{
2008 struct pnfs_layout_segment *lseg, *next;
2009 int remaining = 0;
2010
2011 dprintk("%s:Begin lo %p\n", __func__, lo);
2012
2013 if (list_empty(&lo->plh_segs))
2014 return 0;
2015
2016 assert_spin_locked(&lo->plh_inode->i_lock);
2017
2018 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2019 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2020 dprintk("%s: marking lseg %p iomode %d "
2021 "offset %llu length %llu\n", __func__,
2022 lseg, lseg->pls_range.iomode,
2023 lseg->pls_range.offset,
2024 lseg->pls_range.length);
2025 if (mark_lseg_invalid(lseg, tmp_list))
2026 continue;
2027 remaining++;
2028 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2029 }
2030
2031 if (remaining)
2032 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2033
2034 return remaining;
2035}
2036
2037void pnfs_error_mark_layout_for_return(struct inode *inode,
2038 struct pnfs_layout_segment *lseg)
2039{
2040 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2041 struct pnfs_layout_range range = {
2042 .iomode = lseg->pls_range.iomode,
2043 .offset = 0,
2044 .length = NFS4_MAX_UINT64,
2045 };
2046 bool return_now = false;
2047
2048 spin_lock(&inode->i_lock);
2049 if (!pnfs_layout_is_valid(lo)) {
2050 spin_unlock(&inode->i_lock);
2051 return;
2052 }
2053 pnfs_set_plh_return_info(lo, range.iomode, 0);
2054 /*
2055 * mark all matching lsegs so that we are sure to have no live
2056 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2057 * for how it works.
2058 */
2059 if (!pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0)) {
2060 nfs4_stateid stateid;
2061 enum pnfs_iomode iomode;
2062
2063 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
2064 spin_unlock(&inode->i_lock);
2065 if (return_now)
2066 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2067 } else {
2068 spin_unlock(&inode->i_lock);
2069 nfs_commit_inode(inode, 0);
2070 }
2071}
2072EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2073
2074void
2075pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2076{
2077 if (pgio->pg_lseg == NULL ||
2078 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2079 return;
2080 pnfs_put_lseg(pgio->pg_lseg);
2081 pgio->pg_lseg = NULL;
2082}
2083EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2084
2085/*
2086 * Check for any intersection between the request and the pgio->pg_lseg,
2087 * and if none, put this pgio->pg_lseg away.
2088 */
2089static void
2090pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2091{
2092 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2093 pnfs_put_lseg(pgio->pg_lseg);
2094 pgio->pg_lseg = NULL;
2095 }
2096}
2097
2098void
2099pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2100{
2101 u64 rd_size = req->wb_bytes;
2102
2103 pnfs_generic_pg_check_layout(pgio);
2104 pnfs_generic_pg_check_range(pgio, req);
2105 if (pgio->pg_lseg == NULL) {
2106 if (pgio->pg_dreq == NULL)
2107 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2108 else
2109 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2110
2111 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2112 req->wb_context,
2113 req_offset(req),
2114 rd_size,
2115 IOMODE_READ,
2116 false,
2117 GFP_KERNEL);
2118 if (IS_ERR(pgio->pg_lseg)) {
2119 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2120 pgio->pg_lseg = NULL;
2121 return;
2122 }
2123 }
2124 /* If no lseg, fall back to read through mds */
2125 if (pgio->pg_lseg == NULL)
2126 nfs_pageio_reset_read_mds(pgio);
2127
2128}
2129EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2130
2131void
2132pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2133 struct nfs_page *req, u64 wb_size)
2134{
2135 pnfs_generic_pg_check_layout(pgio);
2136 pnfs_generic_pg_check_range(pgio, req);
2137 if (pgio->pg_lseg == NULL) {
2138 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2139 req->wb_context,
2140 req_offset(req),
2141 wb_size,
2142 IOMODE_RW,
2143 false,
2144 GFP_NOFS);
2145 if (IS_ERR(pgio->pg_lseg)) {
2146 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2147 pgio->pg_lseg = NULL;
2148 return;
2149 }
2150 }
2151 /* If no lseg, fall back to write through mds */
2152 if (pgio->pg_lseg == NULL)
2153 nfs_pageio_reset_write_mds(pgio);
2154}
2155EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2156
2157void
2158pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2159{
2160 if (desc->pg_lseg) {
2161 pnfs_put_lseg(desc->pg_lseg);
2162 desc->pg_lseg = NULL;
2163 }
2164}
2165EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2166
2167/*
2168 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2169 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2170 */
2171size_t
2172pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2173 struct nfs_page *prev, struct nfs_page *req)
2174{
2175 unsigned int size;
2176 u64 seg_end, req_start, seg_left;
2177
2178 size = nfs_generic_pg_test(pgio, prev, req);
2179 if (!size)
2180 return 0;
2181
2182 /*
2183 * 'size' contains the number of bytes left in the current page (up
2184 * to the original size asked for in @req->wb_bytes).
2185 *
2186 * Calculate how many bytes are left in the layout segment
2187 * and if there are less bytes than 'size', return that instead.
2188 *
2189 * Please also note that 'end_offset' is actually the offset of the
2190 * first byte that lies outside the pnfs_layout_range. FIXME?
2191 *
2192 */
2193 if (pgio->pg_lseg) {
2194 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2195 pgio->pg_lseg->pls_range.length);
2196 req_start = req_offset(req);
2197
2198 /* start of request is past the last byte of this segment */
2199 if (req_start >= seg_end)
2200 return 0;
2201
2202 /* adjust 'size' iff there are fewer bytes left in the
2203 * segment than what nfs_generic_pg_test returned */
2204 seg_left = seg_end - req_start;
2205 if (seg_left < size)
2206 size = (unsigned int)seg_left;
2207 }
2208
2209 return size;
2210}
2211EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2212
2213int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2214{
2215 struct nfs_pageio_descriptor pgio;
2216
2217 /* Resend all requests through the MDS */
2218 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2219 hdr->completion_ops);
2220 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2221 return nfs_pageio_resend(&pgio, hdr);
2222}
2223EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2224
2225static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2226{
2227
2228 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2229 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2230 PNFS_LAYOUTRET_ON_ERROR) {
2231 pnfs_return_layout(hdr->inode);
2232 }
2233 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2234 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2235}
2236
2237/*
2238 * Called by non rpc-based layout drivers
2239 */
2240void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2241{
2242 if (likely(!hdr->pnfs_error)) {
2243 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2244 hdr->mds_offset + hdr->res.count);
2245 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2246 }
2247 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2248 if (unlikely(hdr->pnfs_error))
2249 pnfs_ld_handle_write_error(hdr);
2250 hdr->mds_ops->rpc_release(hdr);
2251}
2252EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2253
2254static void
2255pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2256 struct nfs_pgio_header *hdr)
2257{
2258 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2259
2260 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2261 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2262 nfs_pageio_reset_write_mds(desc);
2263 mirror->pg_recoalesce = 1;
2264 }
2265 hdr->completion_ops->completion(hdr);
2266}
2267
2268static enum pnfs_try_status
2269pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2270 const struct rpc_call_ops *call_ops,
2271 struct pnfs_layout_segment *lseg,
2272 int how)
2273{
2274 struct inode *inode = hdr->inode;
2275 enum pnfs_try_status trypnfs;
2276 struct nfs_server *nfss = NFS_SERVER(inode);
2277
2278 hdr->mds_ops = call_ops;
2279
2280 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2281 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2282 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2283 if (trypnfs != PNFS_NOT_ATTEMPTED)
2284 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2285 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2286 return trypnfs;
2287}
2288
2289static void
2290pnfs_do_write(struct nfs_pageio_descriptor *desc,
2291 struct nfs_pgio_header *hdr, int how)
2292{
2293 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2294 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2295 enum pnfs_try_status trypnfs;
2296
2297 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2298 switch (trypnfs) {
2299 case PNFS_NOT_ATTEMPTED:
2300 pnfs_write_through_mds(desc, hdr);
2301 case PNFS_ATTEMPTED:
2302 break;
2303 case PNFS_TRY_AGAIN:
2304 /* cleanup hdr and prepare to redo pnfs */
2305 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2306 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2307 list_splice_init(&hdr->pages, &mirror->pg_list);
2308 mirror->pg_recoalesce = 1;
2309 }
2310 hdr->mds_ops->rpc_release(hdr);
2311 }
2312}
2313
2314static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2315{
2316 pnfs_put_lseg(hdr->lseg);
2317 nfs_pgio_header_free(hdr);
2318}
2319
2320int
2321pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2322{
2323 struct nfs_pgio_header *hdr;
2324 int ret;
2325
2326 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2327 if (!hdr) {
2328 desc->pg_error = -ENOMEM;
2329 return desc->pg_error;
2330 }
2331 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2332
2333 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2334 ret = nfs_generic_pgio(desc, hdr);
2335 if (!ret)
2336 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2337
2338 return ret;
2339}
2340EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2341
2342int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2343{
2344 struct nfs_pageio_descriptor pgio;
2345
2346 /* Resend all requests through the MDS */
2347 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2348 return nfs_pageio_resend(&pgio, hdr);
2349}
2350EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2351
2352static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2353{
2354 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2355 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2356 PNFS_LAYOUTRET_ON_ERROR) {
2357 pnfs_return_layout(hdr->inode);
2358 }
2359 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2360 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2361}
2362
2363/*
2364 * Called by non rpc-based layout drivers
2365 */
2366void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2367{
2368 if (likely(!hdr->pnfs_error))
2369 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2370 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2371 if (unlikely(hdr->pnfs_error))
2372 pnfs_ld_handle_read_error(hdr);
2373 hdr->mds_ops->rpc_release(hdr);
2374}
2375EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2376
2377static void
2378pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2379 struct nfs_pgio_header *hdr)
2380{
2381 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2382
2383 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2384 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2385 nfs_pageio_reset_read_mds(desc);
2386 mirror->pg_recoalesce = 1;
2387 }
2388 hdr->completion_ops->completion(hdr);
2389}
2390
2391/*
2392 * Call the appropriate parallel I/O subsystem read function.
2393 */
2394static enum pnfs_try_status
2395pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2396 const struct rpc_call_ops *call_ops,
2397 struct pnfs_layout_segment *lseg)
2398{
2399 struct inode *inode = hdr->inode;
2400 struct nfs_server *nfss = NFS_SERVER(inode);
2401 enum pnfs_try_status trypnfs;
2402
2403 hdr->mds_ops = call_ops;
2404
2405 dprintk("%s: Reading ino:%lu %u@%llu\n",
2406 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2407
2408 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2409 if (trypnfs != PNFS_NOT_ATTEMPTED)
2410 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2411 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2412 return trypnfs;
2413}
2414
2415/* Resend all requests through pnfs. */
2416void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2417{
2418 struct nfs_pageio_descriptor pgio;
2419
2420 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2421 /* Prevent deadlocks with layoutreturn! */
2422 pnfs_put_lseg(hdr->lseg);
2423 hdr->lseg = NULL;
2424
2425 nfs_pageio_init_read(&pgio, hdr->inode, false,
2426 hdr->completion_ops);
2427 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2428 }
2429}
2430EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2431
2432static void
2433pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2434{
2435 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2436 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2437 enum pnfs_try_status trypnfs;
2438
2439 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2440 switch (trypnfs) {
2441 case PNFS_NOT_ATTEMPTED:
2442 pnfs_read_through_mds(desc, hdr);
2443 case PNFS_ATTEMPTED:
2444 break;
2445 case PNFS_TRY_AGAIN:
2446 /* cleanup hdr and prepare to redo pnfs */
2447 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2448 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2449 list_splice_init(&hdr->pages, &mirror->pg_list);
2450 mirror->pg_recoalesce = 1;
2451 }
2452 hdr->mds_ops->rpc_release(hdr);
2453 }
2454}
2455
2456static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2457{
2458 pnfs_put_lseg(hdr->lseg);
2459 nfs_pgio_header_free(hdr);
2460}
2461
2462int
2463pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2464{
2465 struct nfs_pgio_header *hdr;
2466 int ret;
2467
2468 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2469 if (!hdr) {
2470 desc->pg_error = -ENOMEM;
2471 return desc->pg_error;
2472 }
2473 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2474 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2475 ret = nfs_generic_pgio(desc, hdr);
2476 if (!ret)
2477 pnfs_do_read(desc, hdr);
2478 return ret;
2479}
2480EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2481
2482static void pnfs_clear_layoutcommitting(struct inode *inode)
2483{
2484 unsigned long *bitlock = &NFS_I(inode)->flags;
2485
2486 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2487 smp_mb__after_atomic();
2488 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2489}
2490
2491/*
2492 * There can be multiple RW segments.
2493 */
2494static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2495{
2496 struct pnfs_layout_segment *lseg;
2497
2498 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2499 if (lseg->pls_range.iomode == IOMODE_RW &&
2500 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2501 list_add(&lseg->pls_lc_list, listp);
2502 }
2503}
2504
2505static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2506{
2507 struct pnfs_layout_segment *lseg, *tmp;
2508
2509 /* Matched by references in pnfs_set_layoutcommit */
2510 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2511 list_del_init(&lseg->pls_lc_list);
2512 pnfs_put_lseg(lseg);
2513 }
2514
2515 pnfs_clear_layoutcommitting(inode);
2516}
2517
2518void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2519{
2520 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2521}
2522EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2523
2524void
2525pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2526 loff_t end_pos)
2527{
2528 struct nfs_inode *nfsi = NFS_I(inode);
2529 bool mark_as_dirty = false;
2530
2531 spin_lock(&inode->i_lock);
2532 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2533 nfsi->layout->plh_lwb = end_pos;
2534 mark_as_dirty = true;
2535 dprintk("%s: Set layoutcommit for inode %lu ",
2536 __func__, inode->i_ino);
2537 } else if (end_pos > nfsi->layout->plh_lwb)
2538 nfsi->layout->plh_lwb = end_pos;
2539 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2540 /* references matched in nfs4_layoutcommit_release */
2541 pnfs_get_lseg(lseg);
2542 }
2543 spin_unlock(&inode->i_lock);
2544 dprintk("%s: lseg %p end_pos %llu\n",
2545 __func__, lseg, nfsi->layout->plh_lwb);
2546
2547 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2548 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2549 if (mark_as_dirty)
2550 mark_inode_dirty_sync(inode);
2551}
2552EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2553
2554void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2555{
2556 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2557
2558 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2559 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2560 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2561}
2562
2563/*
2564 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2565 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2566 * data to disk to allow the server to recover the data if it crashes.
2567 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2568 * is off, and a COMMIT is sent to a data server, or
2569 * if WRITEs to a data server return NFS_DATA_SYNC.
2570 */
2571int
2572pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2573{
2574 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2575 struct nfs4_layoutcommit_data *data;
2576 struct nfs_inode *nfsi = NFS_I(inode);
2577 loff_t end_pos;
2578 int status;
2579
2580 if (!pnfs_layoutcommit_outstanding(inode))
2581 return 0;
2582
2583 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2584
2585 status = -EAGAIN;
2586 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2587 if (!sync)
2588 goto out;
2589 status = wait_on_bit_lock_action(&nfsi->flags,
2590 NFS_INO_LAYOUTCOMMITTING,
2591 nfs_wait_bit_killable,
2592 TASK_KILLABLE);
2593 if (status)
2594 goto out;
2595 }
2596
2597 status = -ENOMEM;
2598 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2599 data = kzalloc(sizeof(*data), GFP_NOFS);
2600 if (!data)
2601 goto clear_layoutcommitting;
2602
2603 status = 0;
2604 spin_lock(&inode->i_lock);
2605 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2606 goto out_unlock;
2607
2608 INIT_LIST_HEAD(&data->lseg_list);
2609 pnfs_list_write_lseg(inode, &data->lseg_list);
2610
2611 end_pos = nfsi->layout->plh_lwb;
2612
2613 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2614 spin_unlock(&inode->i_lock);
2615
2616 data->args.inode = inode;
2617 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2618 nfs_fattr_init(&data->fattr);
2619 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2620 data->res.fattr = &data->fattr;
2621 if (end_pos != 0)
2622 data->args.lastbytewritten = end_pos - 1;
2623 else
2624 data->args.lastbytewritten = U64_MAX;
2625 data->res.server = NFS_SERVER(inode);
2626
2627 if (ld->prepare_layoutcommit) {
2628 status = ld->prepare_layoutcommit(&data->args);
2629 if (status) {
2630 put_rpccred(data->cred);
2631 spin_lock(&inode->i_lock);
2632 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2633 if (end_pos > nfsi->layout->plh_lwb)
2634 nfsi->layout->plh_lwb = end_pos;
2635 goto out_unlock;
2636 }
2637 }
2638
2639
2640 status = nfs4_proc_layoutcommit(data, sync);
2641out:
2642 if (status)
2643 mark_inode_dirty_sync(inode);
2644 dprintk("<-- %s status %d\n", __func__, status);
2645 return status;
2646out_unlock:
2647 spin_unlock(&inode->i_lock);
2648 kfree(data);
2649clear_layoutcommitting:
2650 pnfs_clear_layoutcommitting(inode);
2651 goto out;
2652}
2653EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2654
2655int
2656pnfs_generic_sync(struct inode *inode, bool datasync)
2657{
2658 return pnfs_layoutcommit_inode(inode, true);
2659}
2660EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2661
2662struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2663{
2664 struct nfs4_threshold *thp;
2665
2666 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2667 if (!thp) {
2668 dprintk("%s mdsthreshold allocation failed\n", __func__);
2669 return NULL;
2670 }
2671 return thp;
2672}
2673
2674#if IS_ENABLED(CONFIG_NFS_V4_2)
2675int
2676pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2677{
2678 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2679 struct nfs_server *server = NFS_SERVER(inode);
2680 struct nfs_inode *nfsi = NFS_I(inode);
2681 struct nfs42_layoutstat_data *data;
2682 struct pnfs_layout_hdr *hdr;
2683 int status = 0;
2684
2685 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2686 goto out;
2687
2688 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2689 goto out;
2690
2691 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2692 goto out;
2693
2694 spin_lock(&inode->i_lock);
2695 if (!NFS_I(inode)->layout) {
2696 spin_unlock(&inode->i_lock);
2697 goto out_clear_layoutstats;
2698 }
2699 hdr = NFS_I(inode)->layout;
2700 pnfs_get_layout_hdr(hdr);
2701 spin_unlock(&inode->i_lock);
2702
2703 data = kzalloc(sizeof(*data), gfp_flags);
2704 if (!data) {
2705 status = -ENOMEM;
2706 goto out_put;
2707 }
2708
2709 data->args.fh = NFS_FH(inode);
2710 data->args.inode = inode;
2711 status = ld->prepare_layoutstats(&data->args);
2712 if (status)
2713 goto out_free;
2714
2715 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2716
2717out:
2718 dprintk("%s returns %d\n", __func__, status);
2719 return status;
2720
2721out_free:
2722 kfree(data);
2723out_put:
2724 pnfs_put_layout_hdr(hdr);
2725out_clear_layoutstats:
2726 smp_mb__before_atomic();
2727 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2728 smp_mb__after_atomic();
2729 goto out;
2730}
2731EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2732#endif
2733
2734unsigned int layoutstats_timer;
2735module_param(layoutstats_timer, uint, 0644);
2736EXPORT_SYMBOL_GPL(layoutstats_timer);
1/*
2 * pNFS functions to call and manage layout drivers.
3 *
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#include <linux/nfs_fs.h>
31#include <linux/nfs_page.h>
32#include <linux/module.h>
33#include <linux/sort.h>
34#include "internal.h"
35#include "pnfs.h"
36#include "iostat.h"
37#include "nfs4trace.h"
38#include "delegation.h"
39#include "nfs42.h"
40#include "nfs4_fs.h"
41
42#define NFSDBG_FACILITY NFSDBG_PNFS
43#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
44
45/* Locking:
46 *
47 * pnfs_spinlock:
48 * protects pnfs_modules_tbl.
49 */
50static DEFINE_SPINLOCK(pnfs_spinlock);
51
52/*
53 * pnfs_modules_tbl holds all pnfs modules
54 */
55static LIST_HEAD(pnfs_modules_tbl);
56
57static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
58static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
59 struct list_head *free_me,
60 const struct pnfs_layout_range *range,
61 u32 seq);
62static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
63 struct list_head *tmp_list);
64
65/* Return the registered pnfs layout driver module matching given id */
66static struct pnfs_layoutdriver_type *
67find_pnfs_driver_locked(u32 id)
68{
69 struct pnfs_layoutdriver_type *local;
70
71 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
72 if (local->id == id)
73 goto out;
74 local = NULL;
75out:
76 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
77 return local;
78}
79
80static struct pnfs_layoutdriver_type *
81find_pnfs_driver(u32 id)
82{
83 struct pnfs_layoutdriver_type *local;
84
85 spin_lock(&pnfs_spinlock);
86 local = find_pnfs_driver_locked(id);
87 if (local != NULL && !try_module_get(local->owner)) {
88 dprintk("%s: Could not grab reference on module\n", __func__);
89 local = NULL;
90 }
91 spin_unlock(&pnfs_spinlock);
92 return local;
93}
94
95void
96unset_pnfs_layoutdriver(struct nfs_server *nfss)
97{
98 if (nfss->pnfs_curr_ld) {
99 if (nfss->pnfs_curr_ld->clear_layoutdriver)
100 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
101 /* Decrement the MDS count. Purge the deviceid cache if zero */
102 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
103 nfs4_deviceid_purge_client(nfss->nfs_client);
104 module_put(nfss->pnfs_curr_ld->owner);
105 }
106 nfss->pnfs_curr_ld = NULL;
107}
108
109/*
110 * When the server sends a list of layout types, we choose one in the order
111 * given in the list below.
112 *
113 * FIXME: should this list be configurable in some fashion? module param?
114 * mount option? something else?
115 */
116static const u32 ld_prefs[] = {
117 LAYOUT_SCSI,
118 LAYOUT_BLOCK_VOLUME,
119 LAYOUT_OSD2_OBJECTS,
120 LAYOUT_FLEX_FILES,
121 LAYOUT_NFSV4_1_FILES,
122 0
123};
124
125static int
126ld_cmp(const void *e1, const void *e2)
127{
128 u32 ld1 = *((u32 *)e1);
129 u32 ld2 = *((u32 *)e2);
130 int i;
131
132 for (i = 0; ld_prefs[i] != 0; i++) {
133 if (ld1 == ld_prefs[i])
134 return -1;
135
136 if (ld2 == ld_prefs[i])
137 return 1;
138 }
139 return 0;
140}
141
142/*
143 * Try to set the server's pnfs module to the pnfs layout type specified by id.
144 * Currently only one pNFS layout driver per filesystem is supported.
145 *
146 * @ids array of layout types supported by MDS.
147 */
148void
149set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
150 struct nfs_fsinfo *fsinfo)
151{
152 struct pnfs_layoutdriver_type *ld_type = NULL;
153 u32 id;
154 int i;
155
156 if (fsinfo->nlayouttypes == 0)
157 goto out_no_driver;
158 if (!(server->nfs_client->cl_exchange_flags &
159 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
160 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
161 __func__, server->nfs_client->cl_exchange_flags);
162 goto out_no_driver;
163 }
164
165 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
166 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
167
168 for (i = 0; i < fsinfo->nlayouttypes; i++) {
169 id = fsinfo->layouttype[i];
170 ld_type = find_pnfs_driver(id);
171 if (!ld_type) {
172 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
173 id);
174 ld_type = find_pnfs_driver(id);
175 }
176 if (ld_type)
177 break;
178 }
179
180 if (!ld_type) {
181 dprintk("%s: No pNFS module found!\n", __func__);
182 goto out_no_driver;
183 }
184
185 server->pnfs_curr_ld = ld_type;
186 if (ld_type->set_layoutdriver
187 && ld_type->set_layoutdriver(server, mntfh)) {
188 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
189 "driver %u.\n", __func__, id);
190 module_put(ld_type->owner);
191 goto out_no_driver;
192 }
193 /* Bump the MDS count */
194 atomic_inc(&server->nfs_client->cl_mds_count);
195
196 dprintk("%s: pNFS module for %u set\n", __func__, id);
197 return;
198
199out_no_driver:
200 dprintk("%s: Using NFSv4 I/O\n", __func__);
201 server->pnfs_curr_ld = NULL;
202}
203
204int
205pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
206{
207 int status = -EINVAL;
208 struct pnfs_layoutdriver_type *tmp;
209
210 if (ld_type->id == 0) {
211 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
212 return status;
213 }
214 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
215 printk(KERN_ERR "NFS: %s Layout driver must provide "
216 "alloc_lseg and free_lseg.\n", __func__);
217 return status;
218 }
219
220 spin_lock(&pnfs_spinlock);
221 tmp = find_pnfs_driver_locked(ld_type->id);
222 if (!tmp) {
223 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
224 status = 0;
225 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
226 ld_type->name);
227 } else {
228 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
229 __func__, ld_type->id);
230 }
231 spin_unlock(&pnfs_spinlock);
232
233 return status;
234}
235EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
236
237void
238pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
239{
240 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
241 spin_lock(&pnfs_spinlock);
242 list_del(&ld_type->pnfs_tblid);
243 spin_unlock(&pnfs_spinlock);
244}
245EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
246
247/*
248 * pNFS client layout cache
249 */
250
251/* Need to hold i_lock if caller does not already hold reference */
252void
253pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
254{
255 refcount_inc(&lo->plh_refcount);
256}
257
258static struct pnfs_layout_hdr *
259pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
260{
261 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
262 return ld->alloc_layout_hdr(ino, gfp_flags);
263}
264
265static void
266pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
267{
268 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
269 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
270
271 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
272 struct nfs_client *clp = server->nfs_client;
273
274 spin_lock(&clp->cl_lock);
275 list_del_rcu(&lo->plh_layouts);
276 spin_unlock(&clp->cl_lock);
277 }
278 put_cred(lo->plh_lc_cred);
279 return ld->free_layout_hdr(lo);
280}
281
282static void
283pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
284{
285 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
286 dprintk("%s: freeing layout cache %p\n", __func__, lo);
287 nfsi->layout = NULL;
288 /* Reset MDS Threshold I/O counters */
289 nfsi->write_io = 0;
290 nfsi->read_io = 0;
291}
292
293void
294pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
295{
296 struct inode *inode;
297
298 if (!lo)
299 return;
300 inode = lo->plh_inode;
301 pnfs_layoutreturn_before_put_layout_hdr(lo);
302
303 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
304 if (!list_empty(&lo->plh_segs))
305 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
306 pnfs_detach_layout_hdr(lo);
307 spin_unlock(&inode->i_lock);
308 pnfs_free_layout_hdr(lo);
309 }
310}
311
312static struct inode *
313pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo)
314{
315 struct inode *inode = igrab(lo->plh_inode);
316 if (inode)
317 return inode;
318 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
319 return NULL;
320}
321
322static void
323pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
324 u32 seq)
325{
326 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
327 iomode = IOMODE_ANY;
328 lo->plh_return_iomode = iomode;
329 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
330 if (seq != 0) {
331 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
332 lo->plh_return_seq = seq;
333 }
334}
335
336static void
337pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
338{
339 struct pnfs_layout_segment *lseg;
340 lo->plh_return_iomode = 0;
341 lo->plh_return_seq = 0;
342 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
343 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
344 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
345 continue;
346 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
347 }
348}
349
350static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
351{
352 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
353 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
354 smp_mb__after_atomic();
355 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
356 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
357}
358
359static void
360pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
361 struct list_head *free_me)
362{
363 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
364 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
365 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
366 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
367 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
368 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
369}
370
371/*
372 * Update the seqid of a layout stateid after receiving
373 * NFS4ERR_OLD_STATEID
374 */
375bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
376 struct pnfs_layout_range *dst_range,
377 struct inode *inode)
378{
379 struct pnfs_layout_hdr *lo;
380 struct pnfs_layout_range range = {
381 .iomode = IOMODE_ANY,
382 .offset = 0,
383 .length = NFS4_MAX_UINT64,
384 };
385 bool ret = false;
386 LIST_HEAD(head);
387 int err;
388
389 spin_lock(&inode->i_lock);
390 lo = NFS_I(inode)->layout;
391 if (lo && pnfs_layout_is_valid(lo) &&
392 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
393 /* Is our call using the most recent seqid? If so, bump it */
394 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
395 nfs4_stateid_seqid_inc(dst);
396 ret = true;
397 goto out;
398 }
399 /* Try to update the seqid to the most recent */
400 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
401 if (err != -EBUSY) {
402 dst->seqid = lo->plh_stateid.seqid;
403 *dst_range = range;
404 ret = true;
405 }
406 }
407out:
408 spin_unlock(&inode->i_lock);
409 pnfs_free_lseg_list(&head);
410 return ret;
411}
412
413/*
414 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
415 *
416 * In order to continue using the pnfs_layout_hdr, a full recovery
417 * is required.
418 * Note that caller must hold inode->i_lock.
419 */
420int
421pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
422 struct list_head *lseg_list)
423{
424 struct pnfs_layout_range range = {
425 .iomode = IOMODE_ANY,
426 .offset = 0,
427 .length = NFS4_MAX_UINT64,
428 };
429 struct pnfs_layout_segment *lseg, *next;
430
431 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
432 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
433 pnfs_clear_lseg_state(lseg, lseg_list);
434 pnfs_clear_layoutreturn_info(lo);
435 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
436 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
437 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
438 pnfs_clear_layoutreturn_waitbit(lo);
439 return !list_empty(&lo->plh_segs);
440}
441
442static int
443pnfs_iomode_to_fail_bit(u32 iomode)
444{
445 return iomode == IOMODE_RW ?
446 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
447}
448
449static void
450pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
451{
452 lo->plh_retry_timestamp = jiffies;
453 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
454 refcount_inc(&lo->plh_refcount);
455}
456
457static void
458pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
459{
460 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
461 refcount_dec(&lo->plh_refcount);
462}
463
464static void
465pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
466{
467 struct inode *inode = lo->plh_inode;
468 struct pnfs_layout_range range = {
469 .iomode = iomode,
470 .offset = 0,
471 .length = NFS4_MAX_UINT64,
472 };
473 LIST_HEAD(head);
474
475 spin_lock(&inode->i_lock);
476 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
477 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
478 spin_unlock(&inode->i_lock);
479 pnfs_free_lseg_list(&head);
480 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
481 iomode == IOMODE_RW ? "RW" : "READ");
482}
483
484static bool
485pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
486{
487 unsigned long start, end;
488 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
489
490 if (test_bit(fail_bit, &lo->plh_flags) == 0)
491 return false;
492 end = jiffies;
493 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
494 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
495 /* It is time to retry the failed layoutgets */
496 pnfs_layout_clear_fail_bit(lo, fail_bit);
497 return false;
498 }
499 return true;
500}
501
502static void
503pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
504 const struct pnfs_layout_range *range,
505 const nfs4_stateid *stateid)
506{
507 INIT_LIST_HEAD(&lseg->pls_list);
508 INIT_LIST_HEAD(&lseg->pls_lc_list);
509 INIT_LIST_HEAD(&lseg->pls_commits);
510 refcount_set(&lseg->pls_refcount, 1);
511 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
512 lseg->pls_layout = lo;
513 lseg->pls_range = *range;
514 lseg->pls_seq = be32_to_cpu(stateid->seqid);
515}
516
517static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
518{
519 if (lseg != NULL) {
520 struct inode *inode = lseg->pls_layout->plh_inode;
521 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
522 }
523}
524
525static void
526pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
527 struct pnfs_layout_segment *lseg)
528{
529 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
530 list_del_init(&lseg->pls_list);
531 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
532 refcount_dec(&lo->plh_refcount);
533 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
534 return;
535 if (list_empty(&lo->plh_segs) &&
536 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
537 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
538 if (atomic_read(&lo->plh_outstanding) == 0)
539 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
540 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
541 }
542}
543
544static bool
545pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
546 struct pnfs_layout_segment *lseg)
547{
548 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
549 pnfs_layout_is_valid(lo)) {
550 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
551 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
552 return true;
553 }
554 return false;
555}
556
557void
558pnfs_put_lseg(struct pnfs_layout_segment *lseg)
559{
560 struct pnfs_layout_hdr *lo;
561 struct inode *inode;
562
563 if (!lseg)
564 return;
565
566 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
567 refcount_read(&lseg->pls_refcount),
568 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
569
570 lo = lseg->pls_layout;
571 inode = lo->plh_inode;
572
573 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
574 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
575 spin_unlock(&inode->i_lock);
576 return;
577 }
578 pnfs_get_layout_hdr(lo);
579 pnfs_layout_remove_lseg(lo, lseg);
580 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
581 lseg = NULL;
582 spin_unlock(&inode->i_lock);
583 pnfs_free_lseg(lseg);
584 pnfs_put_layout_hdr(lo);
585 }
586}
587EXPORT_SYMBOL_GPL(pnfs_put_lseg);
588
589/*
590 * is l2 fully contained in l1?
591 * start1 end1
592 * [----------------------------------)
593 * start2 end2
594 * [----------------)
595 */
596static bool
597pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
598 const struct pnfs_layout_range *l2)
599{
600 u64 start1 = l1->offset;
601 u64 end1 = pnfs_end_offset(start1, l1->length);
602 u64 start2 = l2->offset;
603 u64 end2 = pnfs_end_offset(start2, l2->length);
604
605 return (start1 <= start2) && (end1 >= end2);
606}
607
608static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
609 struct list_head *tmp_list)
610{
611 if (!refcount_dec_and_test(&lseg->pls_refcount))
612 return false;
613 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
614 list_add(&lseg->pls_list, tmp_list);
615 return true;
616}
617
618/* Returns 1 if lseg is removed from list, 0 otherwise */
619static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
620 struct list_head *tmp_list)
621{
622 int rv = 0;
623
624 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
625 /* Remove the reference keeping the lseg in the
626 * list. It will now be removed when all
627 * outstanding io is finished.
628 */
629 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
630 refcount_read(&lseg->pls_refcount));
631 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
632 rv = 1;
633 }
634 return rv;
635}
636
637/*
638 * Compare 2 layout stateid sequence ids, to see which is newer,
639 * taking into account wraparound issues.
640 */
641static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
642{
643 return (s32)(s1 - s2) > 0;
644}
645
646static bool
647pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
648 const struct pnfs_layout_range *recall_range)
649{
650 return (recall_range->iomode == IOMODE_ANY ||
651 lseg_range->iomode == recall_range->iomode) &&
652 pnfs_lseg_range_intersecting(lseg_range, recall_range);
653}
654
655static bool
656pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
657 const struct pnfs_layout_range *recall_range,
658 u32 seq)
659{
660 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
661 return false;
662 if (recall_range == NULL)
663 return true;
664 return pnfs_should_free_range(&lseg->pls_range, recall_range);
665}
666
667/**
668 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
669 * @lo: layout header containing the lsegs
670 * @tmp_list: list head where doomed lsegs should go
671 * @recall_range: optional recall range argument to match (may be NULL)
672 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
673 *
674 * Walk the list of lsegs in the layout header, and tear down any that should
675 * be destroyed. If "recall_range" is specified then the segment must match
676 * that range. If "seq" is non-zero, then only match segments that were handed
677 * out at or before that sequence.
678 *
679 * Returns number of matching invalid lsegs remaining in list after scanning
680 * it and purging them.
681 */
682int
683pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
684 struct list_head *tmp_list,
685 const struct pnfs_layout_range *recall_range,
686 u32 seq)
687{
688 struct pnfs_layout_segment *lseg, *next;
689 int remaining = 0;
690
691 dprintk("%s:Begin lo %p\n", __func__, lo);
692
693 if (list_empty(&lo->plh_segs))
694 return 0;
695 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
696 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
697 dprintk("%s: freeing lseg %p iomode %d seq %u "
698 "offset %llu length %llu\n", __func__,
699 lseg, lseg->pls_range.iomode, lseg->pls_seq,
700 lseg->pls_range.offset, lseg->pls_range.length);
701 if (!mark_lseg_invalid(lseg, tmp_list))
702 remaining++;
703 }
704 dprintk("%s:Return %i\n", __func__, remaining);
705 return remaining;
706}
707
708static void
709pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
710 struct list_head *free_me,
711 const struct pnfs_layout_range *range,
712 u32 seq)
713{
714 struct pnfs_layout_segment *lseg, *next;
715
716 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
717 if (pnfs_match_lseg_recall(lseg, range, seq))
718 list_move_tail(&lseg->pls_list, free_me);
719 }
720}
721
722/* note free_me must contain lsegs from a single layout_hdr */
723void
724pnfs_free_lseg_list(struct list_head *free_me)
725{
726 struct pnfs_layout_segment *lseg, *tmp;
727
728 if (list_empty(free_me))
729 return;
730
731 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
732 list_del(&lseg->pls_list);
733 pnfs_free_lseg(lseg);
734 }
735}
736
737void
738pnfs_destroy_layout(struct nfs_inode *nfsi)
739{
740 struct pnfs_layout_hdr *lo;
741 LIST_HEAD(tmp_list);
742
743 spin_lock(&nfsi->vfs_inode.i_lock);
744 lo = nfsi->layout;
745 if (lo) {
746 pnfs_get_layout_hdr(lo);
747 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
748 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
749 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
750 spin_unlock(&nfsi->vfs_inode.i_lock);
751 pnfs_free_lseg_list(&tmp_list);
752 nfs_commit_inode(&nfsi->vfs_inode, 0);
753 pnfs_put_layout_hdr(lo);
754 } else
755 spin_unlock(&nfsi->vfs_inode.i_lock);
756}
757EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
758
759static bool
760pnfs_layout_add_bulk_destroy_list(struct inode *inode,
761 struct list_head *layout_list)
762{
763 struct pnfs_layout_hdr *lo;
764 bool ret = false;
765
766 spin_lock(&inode->i_lock);
767 lo = NFS_I(inode)->layout;
768 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
769 pnfs_get_layout_hdr(lo);
770 list_add(&lo->plh_bulk_destroy, layout_list);
771 ret = true;
772 }
773 spin_unlock(&inode->i_lock);
774 return ret;
775}
776
777/* Caller must hold rcu_read_lock and clp->cl_lock */
778static int
779pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
780 struct nfs_server *server,
781 struct list_head *layout_list)
782 __must_hold(&clp->cl_lock)
783 __must_hold(RCU)
784{
785 struct pnfs_layout_hdr *lo, *next;
786 struct inode *inode;
787
788 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
789 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
790 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
791 !list_empty(&lo->plh_bulk_destroy))
792 continue;
793 /* If the sb is being destroyed, just bail */
794 if (!nfs_sb_active(server->super))
795 break;
796 inode = pnfs_grab_inode_layout_hdr(lo);
797 if (inode != NULL) {
798 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags))
799 list_del_rcu(&lo->plh_layouts);
800 if (pnfs_layout_add_bulk_destroy_list(inode,
801 layout_list))
802 continue;
803 rcu_read_unlock();
804 spin_unlock(&clp->cl_lock);
805 iput(inode);
806 } else {
807 rcu_read_unlock();
808 spin_unlock(&clp->cl_lock);
809 }
810 nfs_sb_deactive(server->super);
811 spin_lock(&clp->cl_lock);
812 rcu_read_lock();
813 return -EAGAIN;
814 }
815 return 0;
816}
817
818static int
819pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
820 bool is_bulk_recall)
821{
822 struct pnfs_layout_hdr *lo;
823 struct inode *inode;
824 LIST_HEAD(lseg_list);
825 int ret = 0;
826
827 while (!list_empty(layout_list)) {
828 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
829 plh_bulk_destroy);
830 dprintk("%s freeing layout for inode %lu\n", __func__,
831 lo->plh_inode->i_ino);
832 inode = lo->plh_inode;
833
834 pnfs_layoutcommit_inode(inode, false);
835
836 spin_lock(&inode->i_lock);
837 list_del_init(&lo->plh_bulk_destroy);
838 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
839 if (is_bulk_recall)
840 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
841 ret = -EAGAIN;
842 }
843 spin_unlock(&inode->i_lock);
844 pnfs_free_lseg_list(&lseg_list);
845 /* Free all lsegs that are attached to commit buckets */
846 nfs_commit_inode(inode, 0);
847 pnfs_put_layout_hdr(lo);
848 nfs_iput_and_deactive(inode);
849 }
850 return ret;
851}
852
853int
854pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
855 struct nfs_fsid *fsid,
856 bool is_recall)
857{
858 struct nfs_server *server;
859 LIST_HEAD(layout_list);
860
861 spin_lock(&clp->cl_lock);
862 rcu_read_lock();
863restart:
864 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
865 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
866 continue;
867 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
868 server,
869 &layout_list) != 0)
870 goto restart;
871 }
872 rcu_read_unlock();
873 spin_unlock(&clp->cl_lock);
874
875 if (list_empty(&layout_list))
876 return 0;
877 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
878}
879
880int
881pnfs_destroy_layouts_byclid(struct nfs_client *clp,
882 bool is_recall)
883{
884 struct nfs_server *server;
885 LIST_HEAD(layout_list);
886
887 spin_lock(&clp->cl_lock);
888 rcu_read_lock();
889restart:
890 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
891 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
892 server,
893 &layout_list) != 0)
894 goto restart;
895 }
896 rcu_read_unlock();
897 spin_unlock(&clp->cl_lock);
898
899 if (list_empty(&layout_list))
900 return 0;
901 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
902}
903
904/*
905 * Called by the state manger to remove all layouts established under an
906 * expired lease.
907 */
908void
909pnfs_destroy_all_layouts(struct nfs_client *clp)
910{
911 nfs4_deviceid_mark_client_invalid(clp);
912 nfs4_deviceid_purge_client(clp);
913
914 pnfs_destroy_layouts_byclid(clp, false);
915}
916
917static void
918pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred)
919{
920 const struct cred *old;
921
922 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) {
923 old = xchg(&lo->plh_lc_cred, get_cred(cred));
924 put_cred(old);
925 }
926}
927
928/* update lo->plh_stateid with new if is more recent */
929void
930pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
931 const struct cred *cred, bool update_barrier)
932{
933 u32 oldseq, newseq, new_barrier = 0;
934
935 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
936 newseq = be32_to_cpu(new->seqid);
937
938 if (!pnfs_layout_is_valid(lo)) {
939 pnfs_set_layout_cred(lo, cred);
940 nfs4_stateid_copy(&lo->plh_stateid, new);
941 lo->plh_barrier = newseq;
942 pnfs_clear_layoutreturn_info(lo);
943 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
944 return;
945 }
946 if (pnfs_seqid_is_newer(newseq, oldseq)) {
947 nfs4_stateid_copy(&lo->plh_stateid, new);
948 /*
949 * Because of wraparound, we want to keep the barrier
950 * "close" to the current seqids.
951 */
952 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
953 }
954 if (update_barrier)
955 new_barrier = be32_to_cpu(new->seqid);
956 else if (new_barrier == 0)
957 return;
958 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
959 lo->plh_barrier = new_barrier;
960}
961
962static bool
963pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
964 const nfs4_stateid *stateid)
965{
966 u32 seqid = be32_to_cpu(stateid->seqid);
967
968 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
969}
970
971/* lget is set to 1 if called from inside send_layoutget call chain */
972static bool
973pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
974{
975 return lo->plh_block_lgets ||
976 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
977}
978
979static struct nfs_server *
980pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
981{
982 struct nfs_server *server;
983
984 if (inode) {
985 server = NFS_SERVER(inode);
986 } else {
987 struct dentry *parent_dir = dget_parent(ctx->dentry);
988 server = NFS_SERVER(parent_dir->d_inode);
989 dput(parent_dir);
990 }
991 return server;
992}
993
994static void nfs4_free_pages(struct page **pages, size_t size)
995{
996 int i;
997
998 if (!pages)
999 return;
1000
1001 for (i = 0; i < size; i++) {
1002 if (!pages[i])
1003 break;
1004 __free_page(pages[i]);
1005 }
1006 kfree(pages);
1007}
1008
1009static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
1010{
1011 struct page **pages;
1012 int i;
1013
1014 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
1015 if (!pages) {
1016 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
1017 return NULL;
1018 }
1019
1020 for (i = 0; i < size; i++) {
1021 pages[i] = alloc_page(gfp_flags);
1022 if (!pages[i]) {
1023 dprintk("%s: failed to allocate page\n", __func__);
1024 nfs4_free_pages(pages, i);
1025 return NULL;
1026 }
1027 }
1028
1029 return pages;
1030}
1031
1032static struct nfs4_layoutget *
1033pnfs_alloc_init_layoutget_args(struct inode *ino,
1034 struct nfs_open_context *ctx,
1035 const nfs4_stateid *stateid,
1036 const struct pnfs_layout_range *range,
1037 gfp_t gfp_flags)
1038{
1039 struct nfs_server *server = pnfs_find_server(ino, ctx);
1040 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1041 size_t max_pages = max_response_pages(server);
1042 struct nfs4_layoutget *lgp;
1043
1044 dprintk("--> %s\n", __func__);
1045
1046 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1047 if (lgp == NULL)
1048 return NULL;
1049
1050 if (max_reply_sz) {
1051 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1052 if (npages < max_pages)
1053 max_pages = npages;
1054 }
1055
1056 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1057 if (!lgp->args.layout.pages) {
1058 kfree(lgp);
1059 return NULL;
1060 }
1061 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1062 lgp->res.layoutp = &lgp->args.layout;
1063
1064 /* Don't confuse uninitialised result and success */
1065 lgp->res.status = -NFS4ERR_DELAY;
1066
1067 lgp->args.minlength = PAGE_SIZE;
1068 if (lgp->args.minlength > range->length)
1069 lgp->args.minlength = range->length;
1070 if (ino) {
1071 loff_t i_size = i_size_read(ino);
1072
1073 if (range->iomode == IOMODE_READ) {
1074 if (range->offset >= i_size)
1075 lgp->args.minlength = 0;
1076 else if (i_size - range->offset < lgp->args.minlength)
1077 lgp->args.minlength = i_size - range->offset;
1078 }
1079 }
1080 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1081 pnfs_copy_range(&lgp->args.range, range);
1082 lgp->args.type = server->pnfs_curr_ld->id;
1083 lgp->args.inode = ino;
1084 lgp->args.ctx = get_nfs_open_context(ctx);
1085 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1086 lgp->gfp_flags = gfp_flags;
1087 lgp->cred = ctx->cred;
1088 return lgp;
1089}
1090
1091void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1092{
1093 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1094
1095 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1096 if (lgp->args.inode)
1097 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout);
1098 put_nfs_open_context(lgp->args.ctx);
1099 kfree(lgp);
1100}
1101
1102static void pnfs_clear_layoutcommit(struct inode *inode,
1103 struct list_head *head)
1104{
1105 struct nfs_inode *nfsi = NFS_I(inode);
1106 struct pnfs_layout_segment *lseg, *tmp;
1107
1108 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1109 return;
1110 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1111 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1112 continue;
1113 pnfs_lseg_dec_and_remove_zero(lseg, head);
1114 }
1115}
1116
1117void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1118 const nfs4_stateid *arg_stateid,
1119 const struct pnfs_layout_range *range,
1120 const nfs4_stateid *stateid)
1121{
1122 struct inode *inode = lo->plh_inode;
1123 LIST_HEAD(freeme);
1124
1125 spin_lock(&inode->i_lock);
1126 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
1127 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1128 goto out_unlock;
1129 if (stateid) {
1130 u32 seq = be32_to_cpu(arg_stateid->seqid);
1131
1132 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1133 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1134 pnfs_set_layout_stateid(lo, stateid, NULL, true);
1135 } else
1136 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1137out_unlock:
1138 pnfs_clear_layoutreturn_waitbit(lo);
1139 spin_unlock(&inode->i_lock);
1140 pnfs_free_lseg_list(&freeme);
1141
1142}
1143
1144static bool
1145pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1146 nfs4_stateid *stateid,
1147 const struct cred **cred,
1148 enum pnfs_iomode *iomode)
1149{
1150 /* Serialise LAYOUTGET/LAYOUTRETURN */
1151 if (atomic_read(&lo->plh_outstanding) != 0)
1152 return false;
1153 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1154 return false;
1155 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1156 pnfs_get_layout_hdr(lo);
1157 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1158 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1159 *cred = get_cred(lo->plh_lc_cred);
1160 if (lo->plh_return_seq != 0)
1161 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1162 if (iomode != NULL)
1163 *iomode = lo->plh_return_iomode;
1164 pnfs_clear_layoutreturn_info(lo);
1165 return true;
1166 }
1167 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1168 *cred = get_cred(lo->plh_lc_cred);
1169 if (iomode != NULL)
1170 *iomode = IOMODE_ANY;
1171 return true;
1172}
1173
1174static void
1175pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1176 struct pnfs_layout_hdr *lo,
1177 const nfs4_stateid *stateid,
1178 enum pnfs_iomode iomode)
1179{
1180 struct inode *inode = lo->plh_inode;
1181
1182 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1183 args->inode = inode;
1184 args->range.iomode = iomode;
1185 args->range.offset = 0;
1186 args->range.length = NFS4_MAX_UINT64;
1187 args->layout = lo;
1188 nfs4_stateid_copy(&args->stateid, stateid);
1189}
1190
1191static int
1192pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo,
1193 const nfs4_stateid *stateid,
1194 const struct cred **pcred,
1195 enum pnfs_iomode iomode,
1196 bool sync)
1197{
1198 struct inode *ino = lo->plh_inode;
1199 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1200 struct nfs4_layoutreturn *lrp;
1201 const struct cred *cred = *pcred;
1202 int status = 0;
1203
1204 *pcred = NULL;
1205 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1206 if (unlikely(lrp == NULL)) {
1207 status = -ENOMEM;
1208 spin_lock(&ino->i_lock);
1209 pnfs_clear_layoutreturn_waitbit(lo);
1210 spin_unlock(&ino->i_lock);
1211 put_cred(cred);
1212 pnfs_put_layout_hdr(lo);
1213 goto out;
1214 }
1215
1216 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1217 lrp->args.ld_private = &lrp->ld_private;
1218 lrp->clp = NFS_SERVER(ino)->nfs_client;
1219 lrp->cred = cred;
1220 if (ld->prepare_layoutreturn)
1221 ld->prepare_layoutreturn(&lrp->args);
1222
1223 status = nfs4_proc_layoutreturn(lrp, sync);
1224out:
1225 dprintk("<-- %s status: %d\n", __func__, status);
1226 return status;
1227}
1228
1229static bool
1230pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo,
1231 enum pnfs_iomode iomode,
1232 u32 seq)
1233{
1234 struct pnfs_layout_range recall_range = {
1235 .length = NFS4_MAX_UINT64,
1236 .iomode = iomode,
1237 };
1238 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
1239 &recall_range, seq) != -EBUSY;
1240}
1241
1242/* Return true if layoutreturn is needed */
1243static bool
1244pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1245{
1246 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1247 return false;
1248 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode,
1249 lo->plh_return_seq);
1250}
1251
1252static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1253{
1254 struct inode *inode= lo->plh_inode;
1255
1256 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1257 return;
1258 spin_lock(&inode->i_lock);
1259 if (pnfs_layout_need_return(lo)) {
1260 const struct cred *cred;
1261 nfs4_stateid stateid;
1262 enum pnfs_iomode iomode;
1263 bool send;
1264
1265 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
1266 spin_unlock(&inode->i_lock);
1267 if (send) {
1268 /* Send an async layoutreturn so we dont deadlock */
1269 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
1270 }
1271 } else
1272 spin_unlock(&inode->i_lock);
1273}
1274
1275/*
1276 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1277 * when the layout segment list is empty.
1278 *
1279 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1280 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1281 * deviceid is marked invalid.
1282 */
1283int
1284_pnfs_return_layout(struct inode *ino)
1285{
1286 struct pnfs_layout_hdr *lo = NULL;
1287 struct nfs_inode *nfsi = NFS_I(ino);
1288 LIST_HEAD(tmp_list);
1289 const struct cred *cred;
1290 nfs4_stateid stateid;
1291 int status = 0;
1292 bool send, valid_layout;
1293
1294 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1295
1296 spin_lock(&ino->i_lock);
1297 lo = nfsi->layout;
1298 if (!lo) {
1299 spin_unlock(&ino->i_lock);
1300 dprintk("NFS: %s no layout to return\n", __func__);
1301 goto out;
1302 }
1303 /* Reference matched in nfs4_layoutreturn_release */
1304 pnfs_get_layout_hdr(lo);
1305 /* Is there an outstanding layoutreturn ? */
1306 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1307 spin_unlock(&ino->i_lock);
1308 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1309 TASK_UNINTERRUPTIBLE))
1310 goto out_put_layout_hdr;
1311 spin_lock(&ino->i_lock);
1312 }
1313 valid_layout = pnfs_layout_is_valid(lo);
1314 pnfs_clear_layoutcommit(ino, &tmp_list);
1315 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1316
1317 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1318 struct pnfs_layout_range range = {
1319 .iomode = IOMODE_ANY,
1320 .offset = 0,
1321 .length = NFS4_MAX_UINT64,
1322 };
1323 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1324 }
1325
1326 /* Don't send a LAYOUTRETURN if list was initially empty */
1327 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1328 !valid_layout) {
1329 spin_unlock(&ino->i_lock);
1330 dprintk("NFS: %s no layout segments to return\n", __func__);
1331 goto out_wait_layoutreturn;
1332 }
1333
1334 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
1335 spin_unlock(&ino->i_lock);
1336 if (send)
1337 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
1338out_wait_layoutreturn:
1339 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
1340out_put_layout_hdr:
1341 pnfs_free_lseg_list(&tmp_list);
1342 pnfs_put_layout_hdr(lo);
1343out:
1344 dprintk("<-- %s status: %d\n", __func__, status);
1345 return status;
1346}
1347
1348int
1349pnfs_commit_and_return_layout(struct inode *inode)
1350{
1351 struct pnfs_layout_hdr *lo;
1352 int ret;
1353
1354 spin_lock(&inode->i_lock);
1355 lo = NFS_I(inode)->layout;
1356 if (lo == NULL) {
1357 spin_unlock(&inode->i_lock);
1358 return 0;
1359 }
1360 pnfs_get_layout_hdr(lo);
1361 /* Block new layoutgets and read/write to ds */
1362 lo->plh_block_lgets++;
1363 spin_unlock(&inode->i_lock);
1364 filemap_fdatawait(inode->i_mapping);
1365 ret = pnfs_layoutcommit_inode(inode, true);
1366 if (ret == 0)
1367 ret = _pnfs_return_layout(inode);
1368 spin_lock(&inode->i_lock);
1369 lo->plh_block_lgets--;
1370 spin_unlock(&inode->i_lock);
1371 pnfs_put_layout_hdr(lo);
1372 return ret;
1373}
1374
1375bool pnfs_roc(struct inode *ino,
1376 struct nfs4_layoutreturn_args *args,
1377 struct nfs4_layoutreturn_res *res,
1378 const struct cred *cred)
1379{
1380 struct nfs_inode *nfsi = NFS_I(ino);
1381 struct nfs_open_context *ctx;
1382 struct nfs4_state *state;
1383 struct pnfs_layout_hdr *lo;
1384 struct pnfs_layout_segment *lseg, *next;
1385 const struct cred *lc_cred;
1386 nfs4_stateid stateid;
1387 enum pnfs_iomode iomode = 0;
1388 bool layoutreturn = false, roc = false;
1389 bool skip_read = false;
1390
1391 if (!nfs_have_layout(ino))
1392 return false;
1393retry:
1394 rcu_read_lock();
1395 spin_lock(&ino->i_lock);
1396 lo = nfsi->layout;
1397 if (!lo || !pnfs_layout_is_valid(lo) ||
1398 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1399 lo = NULL;
1400 goto out_noroc;
1401 }
1402 pnfs_get_layout_hdr(lo);
1403 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1404 spin_unlock(&ino->i_lock);
1405 rcu_read_unlock();
1406 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1407 TASK_UNINTERRUPTIBLE);
1408 pnfs_put_layout_hdr(lo);
1409 goto retry;
1410 }
1411
1412 /* no roc if we hold a delegation */
1413 if (nfs4_check_delegation(ino, FMODE_READ)) {
1414 if (nfs4_check_delegation(ino, FMODE_WRITE))
1415 goto out_noroc;
1416 skip_read = true;
1417 }
1418
1419 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1420 state = ctx->state;
1421 if (state == NULL)
1422 continue;
1423 /* Don't return layout if there is open file state */
1424 if (state->state & FMODE_WRITE)
1425 goto out_noroc;
1426 if (state->state & FMODE_READ)
1427 skip_read = true;
1428 }
1429
1430
1431 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1432 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1433 continue;
1434 /* If we are sending layoutreturn, invalidate all valid lsegs */
1435 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1436 continue;
1437 /*
1438 * Note: mark lseg for return so pnfs_layout_remove_lseg
1439 * doesn't invalidate the layout for us.
1440 */
1441 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1442 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1443 continue;
1444 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1445 }
1446
1447 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1448 goto out_noroc;
1449
1450 /* ROC in two conditions:
1451 * 1. there are ROC lsegs
1452 * 2. we don't send layoutreturn
1453 */
1454 /* lo ref dropped in pnfs_roc_release() */
1455 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode);
1456 /* If the creds don't match, we can't compound the layoutreturn */
1457 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
1458 goto out_noroc;
1459
1460 roc = layoutreturn;
1461 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1462 res->lrs_present = 0;
1463 layoutreturn = false;
1464 put_cred(lc_cred);
1465
1466out_noroc:
1467 spin_unlock(&ino->i_lock);
1468 rcu_read_unlock();
1469 pnfs_layoutcommit_inode(ino, true);
1470 if (roc) {
1471 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1472 if (ld->prepare_layoutreturn)
1473 ld->prepare_layoutreturn(args);
1474 pnfs_put_layout_hdr(lo);
1475 return true;
1476 }
1477 if (layoutreturn)
1478 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true);
1479 pnfs_put_layout_hdr(lo);
1480 return false;
1481}
1482
1483int pnfs_roc_done(struct rpc_task *task, struct inode *inode,
1484 struct nfs4_layoutreturn_args **argpp,
1485 struct nfs4_layoutreturn_res **respp,
1486 int *ret)
1487{
1488 struct nfs4_layoutreturn_args *arg = *argpp;
1489 int retval = -EAGAIN;
1490
1491 if (!arg)
1492 return 0;
1493 /* Handle Layoutreturn errors */
1494 switch (*ret) {
1495 case 0:
1496 retval = 0;
1497 break;
1498 case -NFS4ERR_NOMATCHING_LAYOUT:
1499 /* Was there an RPC level error? If not, retry */
1500 if (task->tk_rpc_status == 0)
1501 break;
1502 /* If the call was not sent, let caller handle it */
1503 if (!RPC_WAS_SENT(task))
1504 return 0;
1505 /*
1506 * Otherwise, assume the call succeeded and
1507 * that we need to release the layout
1508 */
1509 *ret = 0;
1510 (*respp)->lrs_present = 0;
1511 retval = 0;
1512 break;
1513 case -NFS4ERR_DELAY:
1514 /* Let the caller handle the retry */
1515 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1516 return 0;
1517 case -NFS4ERR_OLD_STATEID:
1518 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1519 &arg->range, inode))
1520 break;
1521 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1522 return -EAGAIN;
1523 }
1524 *argpp = NULL;
1525 *respp = NULL;
1526 return retval;
1527}
1528
1529void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1530 struct nfs4_layoutreturn_res *res,
1531 int ret)
1532{
1533 struct pnfs_layout_hdr *lo = args->layout;
1534 const nfs4_stateid *arg_stateid = NULL;
1535 const nfs4_stateid *res_stateid = NULL;
1536 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1537
1538 switch (ret) {
1539 case -NFS4ERR_NOMATCHING_LAYOUT:
1540 break;
1541 case 0:
1542 if (res->lrs_present)
1543 res_stateid = &res->stateid;
1544 fallthrough;
1545 default:
1546 arg_stateid = &args->stateid;
1547 }
1548 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret);
1549 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1550 res_stateid);
1551 if (ld_private && ld_private->ops && ld_private->ops->free)
1552 ld_private->ops->free(ld_private);
1553 pnfs_put_layout_hdr(lo);
1554}
1555
1556bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1557{
1558 struct nfs_inode *nfsi = NFS_I(ino);
1559 struct pnfs_layout_hdr *lo;
1560 bool sleep = false;
1561
1562 /* we might not have grabbed lo reference. so need to check under
1563 * i_lock */
1564 spin_lock(&ino->i_lock);
1565 lo = nfsi->layout;
1566 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1567 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1568 sleep = true;
1569 }
1570 spin_unlock(&ino->i_lock);
1571 return sleep;
1572}
1573
1574/*
1575 * Compare two layout segments for sorting into layout cache.
1576 * We want to preferentially return RW over RO layouts, so ensure those
1577 * are seen first.
1578 */
1579static s64
1580pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1581 const struct pnfs_layout_range *l2)
1582{
1583 s64 d;
1584
1585 /* high offset > low offset */
1586 d = l1->offset - l2->offset;
1587 if (d)
1588 return d;
1589
1590 /* short length > long length */
1591 d = l2->length - l1->length;
1592 if (d)
1593 return d;
1594
1595 /* read > read/write */
1596 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1597}
1598
1599static bool
1600pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1601 const struct pnfs_layout_range *l2)
1602{
1603 return pnfs_lseg_range_cmp(l1, l2) > 0;
1604}
1605
1606static bool
1607pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1608 struct pnfs_layout_segment *old)
1609{
1610 return false;
1611}
1612
1613void
1614pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1615 struct pnfs_layout_segment *lseg,
1616 bool (*is_after)(const struct pnfs_layout_range *,
1617 const struct pnfs_layout_range *),
1618 bool (*do_merge)(struct pnfs_layout_segment *,
1619 struct pnfs_layout_segment *),
1620 struct list_head *free_me)
1621{
1622 struct pnfs_layout_segment *lp, *tmp;
1623
1624 dprintk("%s:Begin\n", __func__);
1625
1626 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1627 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1628 continue;
1629 if (do_merge(lseg, lp)) {
1630 mark_lseg_invalid(lp, free_me);
1631 continue;
1632 }
1633 if (is_after(&lseg->pls_range, &lp->pls_range))
1634 continue;
1635 list_add_tail(&lseg->pls_list, &lp->pls_list);
1636 dprintk("%s: inserted lseg %p "
1637 "iomode %d offset %llu length %llu before "
1638 "lp %p iomode %d offset %llu length %llu\n",
1639 __func__, lseg, lseg->pls_range.iomode,
1640 lseg->pls_range.offset, lseg->pls_range.length,
1641 lp, lp->pls_range.iomode, lp->pls_range.offset,
1642 lp->pls_range.length);
1643 goto out;
1644 }
1645 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1646 dprintk("%s: inserted lseg %p "
1647 "iomode %d offset %llu length %llu at tail\n",
1648 __func__, lseg, lseg->pls_range.iomode,
1649 lseg->pls_range.offset, lseg->pls_range.length);
1650out:
1651 pnfs_get_layout_hdr(lo);
1652
1653 dprintk("%s:Return\n", __func__);
1654}
1655EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1656
1657static void
1658pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1659 struct pnfs_layout_segment *lseg,
1660 struct list_head *free_me)
1661{
1662 struct inode *inode = lo->plh_inode;
1663 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1664
1665 if (ld->add_lseg != NULL)
1666 ld->add_lseg(lo, lseg, free_me);
1667 else
1668 pnfs_generic_layout_insert_lseg(lo, lseg,
1669 pnfs_lseg_range_is_after,
1670 pnfs_lseg_no_merge,
1671 free_me);
1672}
1673
1674static struct pnfs_layout_hdr *
1675alloc_init_layout_hdr(struct inode *ino,
1676 struct nfs_open_context *ctx,
1677 gfp_t gfp_flags)
1678{
1679 struct pnfs_layout_hdr *lo;
1680
1681 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1682 if (!lo)
1683 return NULL;
1684 refcount_set(&lo->plh_refcount, 1);
1685 INIT_LIST_HEAD(&lo->plh_layouts);
1686 INIT_LIST_HEAD(&lo->plh_segs);
1687 INIT_LIST_HEAD(&lo->plh_return_segs);
1688 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1689 lo->plh_inode = ino;
1690 lo->plh_lc_cred = get_cred(ctx->cred);
1691 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1692 return lo;
1693}
1694
1695static struct pnfs_layout_hdr *
1696pnfs_find_alloc_layout(struct inode *ino,
1697 struct nfs_open_context *ctx,
1698 gfp_t gfp_flags)
1699 __releases(&ino->i_lock)
1700 __acquires(&ino->i_lock)
1701{
1702 struct nfs_inode *nfsi = NFS_I(ino);
1703 struct pnfs_layout_hdr *new = NULL;
1704
1705 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1706
1707 if (nfsi->layout != NULL)
1708 goto out_existing;
1709 spin_unlock(&ino->i_lock);
1710 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1711 spin_lock(&ino->i_lock);
1712
1713 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1714 nfsi->layout = new;
1715 return new;
1716 } else if (new != NULL)
1717 pnfs_free_layout_hdr(new);
1718out_existing:
1719 pnfs_get_layout_hdr(nfsi->layout);
1720 return nfsi->layout;
1721}
1722
1723/*
1724 * iomode matching rules:
1725 * iomode lseg strict match
1726 * iomode
1727 * ----- ----- ------ -----
1728 * ANY READ N/A true
1729 * ANY RW N/A true
1730 * RW READ N/A false
1731 * RW RW N/A true
1732 * READ READ N/A true
1733 * READ RW true false
1734 * READ RW false true
1735 */
1736static bool
1737pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1738 const struct pnfs_layout_range *range,
1739 bool strict_iomode)
1740{
1741 struct pnfs_layout_range range1;
1742
1743 if ((range->iomode == IOMODE_RW &&
1744 ls_range->iomode != IOMODE_RW) ||
1745 (range->iomode != ls_range->iomode &&
1746 strict_iomode) ||
1747 !pnfs_lseg_range_intersecting(ls_range, range))
1748 return false;
1749
1750 /* range1 covers only the first byte in the range */
1751 range1 = *range;
1752 range1.length = 1;
1753 return pnfs_lseg_range_contained(ls_range, &range1);
1754}
1755
1756/*
1757 * lookup range in layout
1758 */
1759static struct pnfs_layout_segment *
1760pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1761 struct pnfs_layout_range *range,
1762 bool strict_iomode)
1763{
1764 struct pnfs_layout_segment *lseg, *ret = NULL;
1765
1766 dprintk("%s:Begin\n", __func__);
1767
1768 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1769 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1770 pnfs_lseg_range_match(&lseg->pls_range, range,
1771 strict_iomode)) {
1772 ret = pnfs_get_lseg(lseg);
1773 break;
1774 }
1775 }
1776
1777 dprintk("%s:Return lseg %p ref %d\n",
1778 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1779 return ret;
1780}
1781
1782/*
1783 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1784 * to the MDS or over pNFS
1785 *
1786 * The nfs_inode read_io and write_io fields are cumulative counters reset
1787 * when there are no layout segments. Note that in pnfs_update_layout iomode
1788 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1789 * WRITE request.
1790 *
1791 * A return of true means use MDS I/O.
1792 *
1793 * From rfc 5661:
1794 * If a file's size is smaller than the file size threshold, data accesses
1795 * SHOULD be sent to the metadata server. If an I/O request has a length that
1796 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1797 * server. If both file size and I/O size are provided, the client SHOULD
1798 * reach or exceed both thresholds before sending its read or write
1799 * requests to the data server.
1800 */
1801static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1802 struct inode *ino, int iomode)
1803{
1804 struct nfs4_threshold *t = ctx->mdsthreshold;
1805 struct nfs_inode *nfsi = NFS_I(ino);
1806 loff_t fsize = i_size_read(ino);
1807 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1808
1809 if (t == NULL)
1810 return ret;
1811
1812 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1813 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1814
1815 switch (iomode) {
1816 case IOMODE_READ:
1817 if (t->bm & THRESHOLD_RD) {
1818 dprintk("%s fsize %llu\n", __func__, fsize);
1819 size_set = true;
1820 if (fsize < t->rd_sz)
1821 size = true;
1822 }
1823 if (t->bm & THRESHOLD_RD_IO) {
1824 dprintk("%s nfsi->read_io %llu\n", __func__,
1825 nfsi->read_io);
1826 io_set = true;
1827 if (nfsi->read_io < t->rd_io_sz)
1828 io = true;
1829 }
1830 break;
1831 case IOMODE_RW:
1832 if (t->bm & THRESHOLD_WR) {
1833 dprintk("%s fsize %llu\n", __func__, fsize);
1834 size_set = true;
1835 if (fsize < t->wr_sz)
1836 size = true;
1837 }
1838 if (t->bm & THRESHOLD_WR_IO) {
1839 dprintk("%s nfsi->write_io %llu\n", __func__,
1840 nfsi->write_io);
1841 io_set = true;
1842 if (nfsi->write_io < t->wr_io_sz)
1843 io = true;
1844 }
1845 break;
1846 }
1847 if (size_set && io_set) {
1848 if (size && io)
1849 ret = true;
1850 } else if (size || io)
1851 ret = true;
1852
1853 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1854 return ret;
1855}
1856
1857static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1858{
1859 /*
1860 * send layoutcommit as it can hold up layoutreturn due to lseg
1861 * reference
1862 */
1863 pnfs_layoutcommit_inode(lo->plh_inode, false);
1864 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1865 nfs_wait_bit_killable,
1866 TASK_KILLABLE);
1867}
1868
1869static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
1870{
1871 atomic_inc(&lo->plh_outstanding);
1872}
1873
1874static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
1875{
1876 if (atomic_dec_and_test(&lo->plh_outstanding))
1877 wake_up_var(&lo->plh_outstanding);
1878}
1879
1880static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1881{
1882 unsigned long *bitlock = &lo->plh_flags;
1883
1884 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1885 smp_mb__after_atomic();
1886 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1887}
1888
1889static void _add_to_server_list(struct pnfs_layout_hdr *lo,
1890 struct nfs_server *server)
1891{
1892 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
1893 struct nfs_client *clp = server->nfs_client;
1894
1895 /* The lo must be on the clp list if there is any
1896 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1897 */
1898 spin_lock(&clp->cl_lock);
1899 list_add_tail_rcu(&lo->plh_layouts, &server->layouts);
1900 spin_unlock(&clp->cl_lock);
1901 }
1902}
1903
1904/*
1905 * Layout segment is retreived from the server if not cached.
1906 * The appropriate layout segment is referenced and returned to the caller.
1907 */
1908struct pnfs_layout_segment *
1909pnfs_update_layout(struct inode *ino,
1910 struct nfs_open_context *ctx,
1911 loff_t pos,
1912 u64 count,
1913 enum pnfs_iomode iomode,
1914 bool strict_iomode,
1915 gfp_t gfp_flags)
1916{
1917 struct pnfs_layout_range arg = {
1918 .iomode = iomode,
1919 .offset = pos,
1920 .length = count,
1921 };
1922 unsigned pg_offset;
1923 struct nfs_server *server = NFS_SERVER(ino);
1924 struct nfs_client *clp = server->nfs_client;
1925 struct pnfs_layout_hdr *lo = NULL;
1926 struct pnfs_layout_segment *lseg = NULL;
1927 struct nfs4_layoutget *lgp;
1928 nfs4_stateid stateid;
1929 long timeout = 0;
1930 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1931 bool first;
1932
1933 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1934 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1935 PNFS_UPDATE_LAYOUT_NO_PNFS);
1936 goto out;
1937 }
1938
1939 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1940 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1941 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1942 goto out;
1943 }
1944
1945lookup_again:
1946 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
1947 if (IS_ERR(lseg))
1948 goto out;
1949 first = false;
1950 spin_lock(&ino->i_lock);
1951 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1952 if (lo == NULL) {
1953 spin_unlock(&ino->i_lock);
1954 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1955 PNFS_UPDATE_LAYOUT_NOMEM);
1956 goto out;
1957 }
1958
1959 /* Do we even need to bother with this? */
1960 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1961 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1962 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1963 dprintk("%s matches recall, use MDS\n", __func__);
1964 goto out_unlock;
1965 }
1966
1967 /* if LAYOUTGET already failed once we don't try again */
1968 if (pnfs_layout_io_test_failed(lo, iomode)) {
1969 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1970 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1971 goto out_unlock;
1972 }
1973
1974 /*
1975 * If the layout segment list is empty, but there are outstanding
1976 * layoutget calls, then they might be subject to a layoutrecall.
1977 */
1978 if (list_empty(&lo->plh_segs) &&
1979 atomic_read(&lo->plh_outstanding) != 0) {
1980 spin_unlock(&ino->i_lock);
1981 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding,
1982 !atomic_read(&lo->plh_outstanding)));
1983 if (IS_ERR(lseg))
1984 goto out_put_layout_hdr;
1985 pnfs_put_layout_hdr(lo);
1986 goto lookup_again;
1987 }
1988
1989 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1990 if (lseg) {
1991 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1992 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1993 goto out_unlock;
1994 }
1995
1996 /*
1997 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1998 * stateid, or it has been invalidated, then we must use the open
1999 * stateid.
2000 */
2001 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
2002 int status;
2003
2004 /*
2005 * The first layoutget for the file. Need to serialize per
2006 * RFC 5661 Errata 3208.
2007 */
2008 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
2009 &lo->plh_flags)) {
2010 spin_unlock(&ino->i_lock);
2011 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
2012 NFS_LAYOUT_FIRST_LAYOUTGET,
2013 TASK_KILLABLE));
2014 if (IS_ERR(lseg))
2015 goto out_put_layout_hdr;
2016 pnfs_put_layout_hdr(lo);
2017 dprintk("%s retrying\n", __func__);
2018 goto lookup_again;
2019 }
2020
2021 spin_unlock(&ino->i_lock);
2022 first = true;
2023 status = nfs4_select_rw_stateid(ctx->state,
2024 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
2025 NULL, &stateid, NULL);
2026 if (status != 0) {
2027 lseg = ERR_PTR(status);
2028 trace_pnfs_update_layout(ino, pos, count,
2029 iomode, lo, lseg,
2030 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2031 nfs4_schedule_stateid_recovery(server, ctx->state);
2032 pnfs_clear_first_layoutget(lo);
2033 pnfs_put_layout_hdr(lo);
2034 goto lookup_again;
2035 }
2036 spin_lock(&ino->i_lock);
2037 } else {
2038 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2039 }
2040
2041 /*
2042 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
2043 * for LAYOUTRETURN even if first is true.
2044 */
2045 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2046 spin_unlock(&ino->i_lock);
2047 dprintk("%s wait for layoutreturn\n", __func__);
2048 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2049 if (!IS_ERR(lseg)) {
2050 if (first)
2051 pnfs_clear_first_layoutget(lo);
2052 pnfs_put_layout_hdr(lo);
2053 dprintk("%s retrying\n", __func__);
2054 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2055 lseg, PNFS_UPDATE_LAYOUT_RETRY);
2056 goto lookup_again;
2057 }
2058 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2059 PNFS_UPDATE_LAYOUT_RETURN);
2060 goto out_put_layout_hdr;
2061 }
2062
2063 if (pnfs_layoutgets_blocked(lo)) {
2064 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2065 PNFS_UPDATE_LAYOUT_BLOCKED);
2066 goto out_unlock;
2067 }
2068 nfs_layoutget_begin(lo);
2069 spin_unlock(&ino->i_lock);
2070
2071 _add_to_server_list(lo, server);
2072
2073 pg_offset = arg.offset & ~PAGE_MASK;
2074 if (pg_offset) {
2075 arg.offset -= pg_offset;
2076 arg.length += pg_offset;
2077 }
2078 if (arg.length != NFS4_MAX_UINT64)
2079 arg.length = PAGE_ALIGN(arg.length);
2080
2081 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2082 if (!lgp) {
2083 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2084 PNFS_UPDATE_LAYOUT_NOMEM);
2085 nfs_layoutget_end(lo);
2086 goto out_put_layout_hdr;
2087 }
2088
2089 lseg = nfs4_proc_layoutget(lgp, &timeout);
2090 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2091 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2092 nfs_layoutget_end(lo);
2093 if (IS_ERR(lseg)) {
2094 switch(PTR_ERR(lseg)) {
2095 case -EBUSY:
2096 if (time_after(jiffies, giveup))
2097 lseg = NULL;
2098 break;
2099 case -ERECALLCONFLICT:
2100 case -EAGAIN:
2101 break;
2102 default:
2103 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2104 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2105 lseg = NULL;
2106 }
2107 goto out_put_layout_hdr;
2108 }
2109 if (lseg) {
2110 if (first)
2111 pnfs_clear_first_layoutget(lo);
2112 trace_pnfs_update_layout(ino, pos, count,
2113 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2114 pnfs_put_layout_hdr(lo);
2115 goto lookup_again;
2116 }
2117 } else {
2118 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2119 }
2120
2121out_put_layout_hdr:
2122 if (first)
2123 pnfs_clear_first_layoutget(lo);
2124 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2125 PNFS_UPDATE_LAYOUT_EXIT);
2126 pnfs_put_layout_hdr(lo);
2127out:
2128 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2129 "(%s, offset: %llu, length: %llu)\n",
2130 __func__, ino->i_sb->s_id,
2131 (unsigned long long)NFS_FILEID(ino),
2132 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2133 iomode==IOMODE_RW ? "read/write" : "read-only",
2134 (unsigned long long)pos,
2135 (unsigned long long)count);
2136 return lseg;
2137out_unlock:
2138 spin_unlock(&ino->i_lock);
2139 goto out_put_layout_hdr;
2140}
2141EXPORT_SYMBOL_GPL(pnfs_update_layout);
2142
2143static bool
2144pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2145{
2146 switch (range->iomode) {
2147 case IOMODE_READ:
2148 case IOMODE_RW:
2149 break;
2150 default:
2151 return false;
2152 }
2153 if (range->offset == NFS4_MAX_UINT64)
2154 return false;
2155 if (range->length == 0)
2156 return false;
2157 if (range->length != NFS4_MAX_UINT64 &&
2158 range->length > NFS4_MAX_UINT64 - range->offset)
2159 return false;
2160 return true;
2161}
2162
2163static struct pnfs_layout_hdr *
2164_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2165{
2166 struct pnfs_layout_hdr *lo;
2167
2168 spin_lock(&ino->i_lock);
2169 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL);
2170 if (!lo)
2171 goto out_unlock;
2172 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2173 goto out_unlock;
2174 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2175 goto out_unlock;
2176 if (pnfs_layoutgets_blocked(lo))
2177 goto out_unlock;
2178 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2179 goto out_unlock;
2180 nfs_layoutget_begin(lo);
2181 spin_unlock(&ino->i_lock);
2182 _add_to_server_list(lo, NFS_SERVER(ino));
2183 return lo;
2184
2185out_unlock:
2186 spin_unlock(&ino->i_lock);
2187 pnfs_put_layout_hdr(lo);
2188 return NULL;
2189}
2190
2191static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2192 struct nfs_open_context *ctx)
2193{
2194 struct inode *ino = data->dentry->d_inode;
2195 struct pnfs_layout_range rng = {
2196 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2197 IOMODE_RW: IOMODE_READ,
2198 .offset = 0,
2199 .length = NFS4_MAX_UINT64,
2200 };
2201 struct nfs4_layoutget *lgp;
2202 struct pnfs_layout_hdr *lo;
2203
2204 /* Heuristic: don't send layoutget if we have cached data */
2205 if (rng.iomode == IOMODE_READ &&
2206 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2207 return;
2208
2209 lo = _pnfs_grab_empty_layout(ino, ctx);
2210 if (!lo)
2211 return;
2212 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid,
2213 &rng, GFP_KERNEL);
2214 if (!lgp) {
2215 pnfs_clear_first_layoutget(lo);
2216 pnfs_put_layout_hdr(lo);
2217 return;
2218 }
2219 data->lgp = lgp;
2220 data->o_arg.lg_args = &lgp->args;
2221 data->o_res.lg_res = &lgp->res;
2222}
2223
2224static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2225 struct nfs_open_context *ctx)
2226{
2227 struct pnfs_layout_range rng = {
2228 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2229 IOMODE_RW: IOMODE_READ,
2230 .offset = 0,
2231 .length = NFS4_MAX_UINT64,
2232 };
2233 struct nfs4_layoutget *lgp;
2234
2235 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid,
2236 &rng, GFP_KERNEL);
2237 if (!lgp)
2238 return;
2239 data->lgp = lgp;
2240 data->o_arg.lg_args = &lgp->args;
2241 data->o_res.lg_res = &lgp->res;
2242}
2243
2244void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2245 struct nfs_open_context *ctx)
2246{
2247 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2248
2249 if (!(pnfs_enabled_sb(server) &&
2250 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2251 return;
2252 /* Could check on max_ops, but currently hardcoded high enough */
2253 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2254 return;
2255 if (data->state)
2256 _lgopen_prepare_attached(data, ctx);
2257 else
2258 _lgopen_prepare_floating(data, ctx);
2259}
2260
2261void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2262 struct nfs_open_context *ctx)
2263{
2264 struct pnfs_layout_hdr *lo;
2265 struct pnfs_layout_segment *lseg;
2266 struct nfs_server *srv = NFS_SERVER(ino);
2267 u32 iomode;
2268
2269 if (!lgp)
2270 return;
2271 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2272 if (lgp->res.status) {
2273 switch (lgp->res.status) {
2274 default:
2275 break;
2276 /*
2277 * Halt lgopen attempts if the server doesn't recognise
2278 * the "current stateid" value, the layout type, or the
2279 * layoutget operation as being valid.
2280 * Also if it complains about too many ops in the compound
2281 * or of the request/reply being too big.
2282 */
2283 case -NFS4ERR_BAD_STATEID:
2284 case -NFS4ERR_NOTSUPP:
2285 case -NFS4ERR_REP_TOO_BIG:
2286 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2287 case -NFS4ERR_REQ_TOO_BIG:
2288 case -NFS4ERR_TOO_MANY_OPS:
2289 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2290 srv->caps &= ~NFS_CAP_LGOPEN;
2291 }
2292 return;
2293 }
2294 if (!lgp->args.inode) {
2295 lo = _pnfs_grab_empty_layout(ino, ctx);
2296 if (!lo)
2297 return;
2298 lgp->args.inode = ino;
2299 } else
2300 lo = NFS_I(lgp->args.inode)->layout;
2301
2302 lseg = pnfs_layout_process(lgp);
2303 if (!IS_ERR(lseg)) {
2304 iomode = lgp->args.range.iomode;
2305 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2306 pnfs_put_lseg(lseg);
2307 }
2308}
2309
2310void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2311{
2312 if (lgp != NULL) {
2313 struct inode *inode = lgp->args.inode;
2314 if (inode) {
2315 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2316 pnfs_clear_first_layoutget(lo);
2317 nfs_layoutget_end(lo);
2318 }
2319 pnfs_layoutget_free(lgp);
2320 }
2321}
2322
2323struct pnfs_layout_segment *
2324pnfs_layout_process(struct nfs4_layoutget *lgp)
2325{
2326 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
2327 struct nfs4_layoutget_res *res = &lgp->res;
2328 struct pnfs_layout_segment *lseg;
2329 struct inode *ino = lo->plh_inode;
2330 LIST_HEAD(free_me);
2331
2332 if (!pnfs_sanity_check_layout_range(&res->range))
2333 return ERR_PTR(-EINVAL);
2334
2335 /* Inject layout blob into I/O device driver */
2336 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2337 if (IS_ERR_OR_NULL(lseg)) {
2338 if (!lseg)
2339 lseg = ERR_PTR(-ENOMEM);
2340
2341 dprintk("%s: Could not allocate layout: error %ld\n",
2342 __func__, PTR_ERR(lseg));
2343 return lseg;
2344 }
2345
2346 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2347
2348 spin_lock(&ino->i_lock);
2349 if (pnfs_layoutgets_blocked(lo)) {
2350 dprintk("%s forget reply due to state\n", __func__);
2351 goto out_forget;
2352 }
2353
2354 if (!pnfs_layout_is_valid(lo)) {
2355 /* We have a completely new layout */
2356 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
2357 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2358 /* existing state ID, make sure the sequence number matches. */
2359 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2360 dprintk("%s forget reply due to sequence\n", __func__);
2361 goto out_forget;
2362 }
2363 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false);
2364 } else {
2365 /*
2366 * We got an entirely new state ID. Mark all segments for the
2367 * inode invalid, and retry the layoutget
2368 */
2369 pnfs_mark_layout_stateid_invalid(lo, &free_me);
2370 goto out_forget;
2371 }
2372
2373 pnfs_get_lseg(lseg);
2374 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2375
2376
2377 if (res->return_on_close)
2378 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2379
2380 spin_unlock(&ino->i_lock);
2381 pnfs_free_lseg_list(&free_me);
2382 return lseg;
2383
2384out_forget:
2385 spin_unlock(&ino->i_lock);
2386 lseg->pls_layout = lo;
2387 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2388 return ERR_PTR(-EAGAIN);
2389}
2390
2391/**
2392 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2393 * @lo: pointer to layout header
2394 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2395 * @return_range: describe layout segment ranges to be returned
2396 * @seq: stateid seqid to match
2397 *
2398 * This function is mainly intended for use by layoutrecall. It attempts
2399 * to free the layout segment immediately, or else to mark it for return
2400 * as soon as its reference count drops to zero.
2401 *
2402 * Returns
2403 * - 0: a layoutreturn needs to be scheduled.
2404 * - EBUSY: there are layout segment that are still in use.
2405 * - ENOENT: there are no layout segments that need to be returned.
2406 */
2407int
2408pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2409 struct list_head *tmp_list,
2410 const struct pnfs_layout_range *return_range,
2411 u32 seq)
2412{
2413 struct pnfs_layout_segment *lseg, *next;
2414 int remaining = 0;
2415
2416 dprintk("%s:Begin lo %p\n", __func__, lo);
2417
2418 assert_spin_locked(&lo->plh_inode->i_lock);
2419
2420 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2421 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2422 dprintk("%s: marking lseg %p iomode %d "
2423 "offset %llu length %llu\n", __func__,
2424 lseg, lseg->pls_range.iomode,
2425 lseg->pls_range.offset,
2426 lseg->pls_range.length);
2427 if (mark_lseg_invalid(lseg, tmp_list))
2428 continue;
2429 remaining++;
2430 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2431 }
2432
2433 if (remaining) {
2434 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2435 return -EBUSY;
2436 }
2437
2438 if (!list_empty(&lo->plh_return_segs)) {
2439 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2440 return 0;
2441 }
2442
2443 return -ENOENT;
2444}
2445
2446static void
2447pnfs_mark_layout_for_return(struct inode *inode,
2448 const struct pnfs_layout_range *range)
2449{
2450 struct pnfs_layout_hdr *lo;
2451 bool return_now = false;
2452
2453 spin_lock(&inode->i_lock);
2454 lo = NFS_I(inode)->layout;
2455 if (!pnfs_layout_is_valid(lo)) {
2456 spin_unlock(&inode->i_lock);
2457 return;
2458 }
2459 pnfs_set_plh_return_info(lo, range->iomode, 0);
2460 /*
2461 * mark all matching lsegs so that we are sure to have no live
2462 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2463 * for how it works.
2464 */
2465 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) {
2466 const struct cred *cred;
2467 nfs4_stateid stateid;
2468 enum pnfs_iomode iomode;
2469
2470 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
2471 spin_unlock(&inode->i_lock);
2472 if (return_now)
2473 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
2474 } else {
2475 spin_unlock(&inode->i_lock);
2476 nfs_commit_inode(inode, 0);
2477 }
2478}
2479
2480void pnfs_error_mark_layout_for_return(struct inode *inode,
2481 struct pnfs_layout_segment *lseg)
2482{
2483 struct pnfs_layout_range range = {
2484 .iomode = lseg->pls_range.iomode,
2485 .offset = 0,
2486 .length = NFS4_MAX_UINT64,
2487 };
2488
2489 pnfs_mark_layout_for_return(inode, &range);
2490}
2491EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2492
2493static bool
2494pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo)
2495{
2496 return pnfs_layout_is_valid(lo) &&
2497 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) &&
2498 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
2499}
2500
2501static struct pnfs_layout_segment *
2502pnfs_find_first_lseg(struct pnfs_layout_hdr *lo,
2503 const struct pnfs_layout_range *range,
2504 enum pnfs_iomode iomode)
2505{
2506 struct pnfs_layout_segment *lseg;
2507
2508 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
2509 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
2510 continue;
2511 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2512 continue;
2513 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY)
2514 continue;
2515 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range))
2516 return lseg;
2517 }
2518 return NULL;
2519}
2520
2521/* Find open file states whose mode matches that of the range */
2522static bool
2523pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo,
2524 const struct pnfs_layout_range *range)
2525{
2526 struct list_head *head;
2527 struct nfs_open_context *ctx;
2528 fmode_t mode = 0;
2529
2530 if (!pnfs_layout_can_be_returned(lo) ||
2531 !pnfs_find_first_lseg(lo, range, range->iomode))
2532 return false;
2533
2534 head = &NFS_I(lo->plh_inode)->open_files;
2535 list_for_each_entry_rcu(ctx, head, list) {
2536 if (ctx->state)
2537 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE);
2538 }
2539
2540 switch (range->iomode) {
2541 default:
2542 break;
2543 case IOMODE_READ:
2544 mode &= ~FMODE_WRITE;
2545 break;
2546 case IOMODE_RW:
2547 if (pnfs_find_first_lseg(lo, range, IOMODE_READ))
2548 mode &= ~FMODE_READ;
2549 }
2550 return mode == 0;
2551}
2552
2553static int
2554pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data)
2555{
2556 const struct pnfs_layout_range *range = data;
2557 struct pnfs_layout_hdr *lo;
2558 struct inode *inode;
2559restart:
2560 rcu_read_lock();
2561 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
2562 if (!pnfs_layout_can_be_returned(lo) ||
2563 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2564 continue;
2565 inode = lo->plh_inode;
2566 spin_lock(&inode->i_lock);
2567 if (!pnfs_should_return_unused_layout(lo, range)) {
2568 spin_unlock(&inode->i_lock);
2569 continue;
2570 }
2571 spin_unlock(&inode->i_lock);
2572 inode = pnfs_grab_inode_layout_hdr(lo);
2573 if (!inode)
2574 continue;
2575 rcu_read_unlock();
2576 pnfs_mark_layout_for_return(inode, range);
2577 iput(inode);
2578 cond_resched();
2579 goto restart;
2580 }
2581 rcu_read_unlock();
2582 return 0;
2583}
2584
2585void
2586pnfs_layout_return_unused_byclid(struct nfs_client *clp,
2587 enum pnfs_iomode iomode)
2588{
2589 struct pnfs_layout_range range = {
2590 .iomode = iomode,
2591 .offset = 0,
2592 .length = NFS4_MAX_UINT64,
2593 };
2594
2595 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver,
2596 &range);
2597}
2598
2599void
2600pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio)
2601{
2602 if (pgio->pg_lseg == NULL ||
2603 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags))
2604 return;
2605 pnfs_put_lseg(pgio->pg_lseg);
2606 pgio->pg_lseg = NULL;
2607}
2608EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2609
2610/*
2611 * Check for any intersection between the request and the pgio->pg_lseg,
2612 * and if none, put this pgio->pg_lseg away.
2613 */
2614void
2615pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2616{
2617 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) {
2618 pnfs_put_lseg(pgio->pg_lseg);
2619 pgio->pg_lseg = NULL;
2620 }
2621}
2622EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range);
2623
2624void
2625pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2626{
2627 u64 rd_size = req->wb_bytes;
2628
2629 pnfs_generic_pg_check_layout(pgio);
2630 pnfs_generic_pg_check_range(pgio, req);
2631 if (pgio->pg_lseg == NULL) {
2632 if (pgio->pg_dreq == NULL)
2633 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2634 else
2635 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2636
2637 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2638 nfs_req_openctx(req),
2639 req_offset(req),
2640 rd_size,
2641 IOMODE_READ,
2642 false,
2643 GFP_KERNEL);
2644 if (IS_ERR(pgio->pg_lseg)) {
2645 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2646 pgio->pg_lseg = NULL;
2647 return;
2648 }
2649 }
2650 /* If no lseg, fall back to read through mds */
2651 if (pgio->pg_lseg == NULL)
2652 nfs_pageio_reset_read_mds(pgio);
2653
2654}
2655EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2656
2657void
2658pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2659 struct nfs_page *req, u64 wb_size)
2660{
2661 pnfs_generic_pg_check_layout(pgio);
2662 pnfs_generic_pg_check_range(pgio, req);
2663 if (pgio->pg_lseg == NULL) {
2664 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2665 nfs_req_openctx(req),
2666 req_offset(req),
2667 wb_size,
2668 IOMODE_RW,
2669 false,
2670 GFP_KERNEL);
2671 if (IS_ERR(pgio->pg_lseg)) {
2672 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2673 pgio->pg_lseg = NULL;
2674 return;
2675 }
2676 }
2677 /* If no lseg, fall back to write through mds */
2678 if (pgio->pg_lseg == NULL)
2679 nfs_pageio_reset_write_mds(pgio);
2680}
2681EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2682
2683void
2684pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2685{
2686 if (desc->pg_lseg) {
2687 pnfs_put_lseg(desc->pg_lseg);
2688 desc->pg_lseg = NULL;
2689 }
2690}
2691EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2692
2693/*
2694 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2695 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2696 */
2697size_t
2698pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2699 struct nfs_page *prev, struct nfs_page *req)
2700{
2701 unsigned int size;
2702 u64 seg_end, req_start, seg_left;
2703
2704 size = nfs_generic_pg_test(pgio, prev, req);
2705 if (!size)
2706 return 0;
2707
2708 /*
2709 * 'size' contains the number of bytes left in the current page (up
2710 * to the original size asked for in @req->wb_bytes).
2711 *
2712 * Calculate how many bytes are left in the layout segment
2713 * and if there are less bytes than 'size', return that instead.
2714 *
2715 * Please also note that 'end_offset' is actually the offset of the
2716 * first byte that lies outside the pnfs_layout_range. FIXME?
2717 *
2718 */
2719 if (pgio->pg_lseg) {
2720 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2721 pgio->pg_lseg->pls_range.length);
2722 req_start = req_offset(req);
2723
2724 /* start of request is past the last byte of this segment */
2725 if (req_start >= seg_end)
2726 return 0;
2727
2728 /* adjust 'size' iff there are fewer bytes left in the
2729 * segment than what nfs_generic_pg_test returned */
2730 seg_left = seg_end - req_start;
2731 if (seg_left < size)
2732 size = (unsigned int)seg_left;
2733 }
2734
2735 return size;
2736}
2737EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2738
2739int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2740{
2741 struct nfs_pageio_descriptor pgio;
2742
2743 /* Resend all requests through the MDS */
2744 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2745 hdr->completion_ops);
2746 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2747 return nfs_pageio_resend(&pgio, hdr);
2748}
2749EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2750
2751static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2752{
2753
2754 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2755 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2756 PNFS_LAYOUTRET_ON_ERROR) {
2757 pnfs_return_layout(hdr->inode);
2758 }
2759 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2760 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2761}
2762
2763/*
2764 * Called by non rpc-based layout drivers
2765 */
2766void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2767{
2768 if (likely(!hdr->pnfs_error)) {
2769 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2770 hdr->mds_offset + hdr->res.count);
2771 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2772 }
2773 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2774 if (unlikely(hdr->pnfs_error))
2775 pnfs_ld_handle_write_error(hdr);
2776 hdr->mds_ops->rpc_release(hdr);
2777}
2778EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2779
2780static void
2781pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2782 struct nfs_pgio_header *hdr)
2783{
2784 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2785
2786 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2787 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2788 nfs_pageio_reset_write_mds(desc);
2789 mirror->pg_recoalesce = 1;
2790 }
2791 hdr->completion_ops->completion(hdr);
2792}
2793
2794static enum pnfs_try_status
2795pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2796 const struct rpc_call_ops *call_ops,
2797 struct pnfs_layout_segment *lseg,
2798 int how)
2799{
2800 struct inode *inode = hdr->inode;
2801 enum pnfs_try_status trypnfs;
2802 struct nfs_server *nfss = NFS_SERVER(inode);
2803
2804 hdr->mds_ops = call_ops;
2805
2806 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2807 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2808 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2809 if (trypnfs != PNFS_NOT_ATTEMPTED)
2810 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2811 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2812 return trypnfs;
2813}
2814
2815static void
2816pnfs_do_write(struct nfs_pageio_descriptor *desc,
2817 struct nfs_pgio_header *hdr, int how)
2818{
2819 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2820 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2821 enum pnfs_try_status trypnfs;
2822
2823 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2824 switch (trypnfs) {
2825 case PNFS_NOT_ATTEMPTED:
2826 pnfs_write_through_mds(desc, hdr);
2827 case PNFS_ATTEMPTED:
2828 break;
2829 case PNFS_TRY_AGAIN:
2830 /* cleanup hdr and prepare to redo pnfs */
2831 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2832 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2833 list_splice_init(&hdr->pages, &mirror->pg_list);
2834 mirror->pg_recoalesce = 1;
2835 }
2836 hdr->mds_ops->rpc_release(hdr);
2837 }
2838}
2839
2840static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2841{
2842 pnfs_put_lseg(hdr->lseg);
2843 nfs_pgio_header_free(hdr);
2844}
2845
2846int
2847pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2848{
2849 struct nfs_pgio_header *hdr;
2850 int ret;
2851
2852 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2853 if (!hdr) {
2854 desc->pg_error = -ENOMEM;
2855 return desc->pg_error;
2856 }
2857 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2858
2859 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2860 ret = nfs_generic_pgio(desc, hdr);
2861 if (!ret)
2862 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2863
2864 return ret;
2865}
2866EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2867
2868int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2869{
2870 struct nfs_pageio_descriptor pgio;
2871
2872 /* Resend all requests through the MDS */
2873 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2874 return nfs_pageio_resend(&pgio, hdr);
2875}
2876EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2877
2878static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2879{
2880 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2881 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2882 PNFS_LAYOUTRET_ON_ERROR) {
2883 pnfs_return_layout(hdr->inode);
2884 }
2885 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2886 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2887}
2888
2889/*
2890 * Called by non rpc-based layout drivers
2891 */
2892void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2893{
2894 if (likely(!hdr->pnfs_error))
2895 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2896 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2897 if (unlikely(hdr->pnfs_error))
2898 pnfs_ld_handle_read_error(hdr);
2899 hdr->mds_ops->rpc_release(hdr);
2900}
2901EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2902
2903static void
2904pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2905 struct nfs_pgio_header *hdr)
2906{
2907 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2908
2909 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2910 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2911 nfs_pageio_reset_read_mds(desc);
2912 mirror->pg_recoalesce = 1;
2913 }
2914 hdr->completion_ops->completion(hdr);
2915}
2916
2917/*
2918 * Call the appropriate parallel I/O subsystem read function.
2919 */
2920static enum pnfs_try_status
2921pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2922 const struct rpc_call_ops *call_ops,
2923 struct pnfs_layout_segment *lseg)
2924{
2925 struct inode *inode = hdr->inode;
2926 struct nfs_server *nfss = NFS_SERVER(inode);
2927 enum pnfs_try_status trypnfs;
2928
2929 hdr->mds_ops = call_ops;
2930
2931 dprintk("%s: Reading ino:%lu %u@%llu\n",
2932 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2933
2934 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2935 if (trypnfs != PNFS_NOT_ATTEMPTED)
2936 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2937 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2938 return trypnfs;
2939}
2940
2941/* Resend all requests through pnfs. */
2942void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr,
2943 unsigned int mirror_idx)
2944{
2945 struct nfs_pageio_descriptor pgio;
2946
2947 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2948 /* Prevent deadlocks with layoutreturn! */
2949 pnfs_put_lseg(hdr->lseg);
2950 hdr->lseg = NULL;
2951
2952 nfs_pageio_init_read(&pgio, hdr->inode, false,
2953 hdr->completion_ops);
2954 pgio.pg_mirror_idx = mirror_idx;
2955 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2956 }
2957}
2958EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2959
2960static void
2961pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2962{
2963 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2964 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2965 enum pnfs_try_status trypnfs;
2966
2967 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2968 switch (trypnfs) {
2969 case PNFS_NOT_ATTEMPTED:
2970 pnfs_read_through_mds(desc, hdr);
2971 case PNFS_ATTEMPTED:
2972 break;
2973 case PNFS_TRY_AGAIN:
2974 /* cleanup hdr and prepare to redo pnfs */
2975 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2976 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2977 list_splice_init(&hdr->pages, &mirror->pg_list);
2978 mirror->pg_recoalesce = 1;
2979 }
2980 hdr->mds_ops->rpc_release(hdr);
2981 }
2982}
2983
2984static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2985{
2986 pnfs_put_lseg(hdr->lseg);
2987 nfs_pgio_header_free(hdr);
2988}
2989
2990int
2991pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2992{
2993 struct nfs_pgio_header *hdr;
2994 int ret;
2995
2996 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2997 if (!hdr) {
2998 desc->pg_error = -ENOMEM;
2999 return desc->pg_error;
3000 }
3001 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
3002 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
3003 ret = nfs_generic_pgio(desc, hdr);
3004 if (!ret)
3005 pnfs_do_read(desc, hdr);
3006 return ret;
3007}
3008EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
3009
3010static void pnfs_clear_layoutcommitting(struct inode *inode)
3011{
3012 unsigned long *bitlock = &NFS_I(inode)->flags;
3013
3014 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
3015 smp_mb__after_atomic();
3016 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
3017}
3018
3019/*
3020 * There can be multiple RW segments.
3021 */
3022static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
3023{
3024 struct pnfs_layout_segment *lseg;
3025
3026 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
3027 if (lseg->pls_range.iomode == IOMODE_RW &&
3028 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
3029 list_add(&lseg->pls_lc_list, listp);
3030 }
3031}
3032
3033static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
3034{
3035 struct pnfs_layout_segment *lseg, *tmp;
3036
3037 /* Matched by references in pnfs_set_layoutcommit */
3038 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
3039 list_del_init(&lseg->pls_lc_list);
3040 pnfs_put_lseg(lseg);
3041 }
3042
3043 pnfs_clear_layoutcommitting(inode);
3044}
3045
3046void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
3047{
3048 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
3049}
3050EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
3051
3052void
3053pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
3054 loff_t end_pos)
3055{
3056 struct nfs_inode *nfsi = NFS_I(inode);
3057 bool mark_as_dirty = false;
3058
3059 spin_lock(&inode->i_lock);
3060 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
3061 nfsi->layout->plh_lwb = end_pos;
3062 mark_as_dirty = true;
3063 dprintk("%s: Set layoutcommit for inode %lu ",
3064 __func__, inode->i_ino);
3065 } else if (end_pos > nfsi->layout->plh_lwb)
3066 nfsi->layout->plh_lwb = end_pos;
3067 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
3068 /* references matched in nfs4_layoutcommit_release */
3069 pnfs_get_lseg(lseg);
3070 }
3071 spin_unlock(&inode->i_lock);
3072 dprintk("%s: lseg %p end_pos %llu\n",
3073 __func__, lseg, nfsi->layout->plh_lwb);
3074
3075 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
3076 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
3077 if (mark_as_dirty)
3078 mark_inode_dirty_sync(inode);
3079}
3080EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
3081
3082void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
3083{
3084 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
3085
3086 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
3087 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
3088 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
3089}
3090
3091/*
3092 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3093 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
3094 * data to disk to allow the server to recover the data if it crashes.
3095 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
3096 * is off, and a COMMIT is sent to a data server, or
3097 * if WRITEs to a data server return NFS_DATA_SYNC.
3098 */
3099int
3100pnfs_layoutcommit_inode(struct inode *inode, bool sync)
3101{
3102 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3103 struct nfs4_layoutcommit_data *data;
3104 struct nfs_inode *nfsi = NFS_I(inode);
3105 loff_t end_pos;
3106 int status;
3107
3108 if (!pnfs_layoutcommit_outstanding(inode))
3109 return 0;
3110
3111 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
3112
3113 status = -EAGAIN;
3114 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
3115 if (!sync)
3116 goto out;
3117 status = wait_on_bit_lock_action(&nfsi->flags,
3118 NFS_INO_LAYOUTCOMMITTING,
3119 nfs_wait_bit_killable,
3120 TASK_KILLABLE);
3121 if (status)
3122 goto out;
3123 }
3124
3125 status = -ENOMEM;
3126 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
3127 data = kzalloc(sizeof(*data), GFP_NOFS);
3128 if (!data)
3129 goto clear_layoutcommitting;
3130
3131 status = 0;
3132 spin_lock(&inode->i_lock);
3133 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
3134 goto out_unlock;
3135
3136 INIT_LIST_HEAD(&data->lseg_list);
3137 pnfs_list_write_lseg(inode, &data->lseg_list);
3138
3139 end_pos = nfsi->layout->plh_lwb;
3140
3141 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3142 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3143 spin_unlock(&inode->i_lock);
3144
3145 data->args.inode = inode;
3146 nfs_fattr_init(&data->fattr);
3147 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3148 data->res.fattr = &data->fattr;
3149 if (end_pos != 0)
3150 data->args.lastbytewritten = end_pos - 1;
3151 else
3152 data->args.lastbytewritten = U64_MAX;
3153 data->res.server = NFS_SERVER(inode);
3154
3155 if (ld->prepare_layoutcommit) {
3156 status = ld->prepare_layoutcommit(&data->args);
3157 if (status) {
3158 put_cred(data->cred);
3159 spin_lock(&inode->i_lock);
3160 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3161 if (end_pos > nfsi->layout->plh_lwb)
3162 nfsi->layout->plh_lwb = end_pos;
3163 goto out_unlock;
3164 }
3165 }
3166
3167
3168 status = nfs4_proc_layoutcommit(data, sync);
3169out:
3170 if (status)
3171 mark_inode_dirty_sync(inode);
3172 dprintk("<-- %s status %d\n", __func__, status);
3173 return status;
3174out_unlock:
3175 spin_unlock(&inode->i_lock);
3176 kfree(data);
3177clear_layoutcommitting:
3178 pnfs_clear_layoutcommitting(inode);
3179 goto out;
3180}
3181EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3182
3183int
3184pnfs_generic_sync(struct inode *inode, bool datasync)
3185{
3186 return pnfs_layoutcommit_inode(inode, true);
3187}
3188EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3189
3190struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3191{
3192 struct nfs4_threshold *thp;
3193
3194 thp = kzalloc(sizeof(*thp), GFP_NOFS);
3195 if (!thp) {
3196 dprintk("%s mdsthreshold allocation failed\n", __func__);
3197 return NULL;
3198 }
3199 return thp;
3200}
3201
3202#if IS_ENABLED(CONFIG_NFS_V4_2)
3203int
3204pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3205{
3206 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3207 struct nfs_server *server = NFS_SERVER(inode);
3208 struct nfs_inode *nfsi = NFS_I(inode);
3209 struct nfs42_layoutstat_data *data;
3210 struct pnfs_layout_hdr *hdr;
3211 int status = 0;
3212
3213 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3214 goto out;
3215
3216 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3217 goto out;
3218
3219 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3220 goto out;
3221
3222 spin_lock(&inode->i_lock);
3223 if (!NFS_I(inode)->layout) {
3224 spin_unlock(&inode->i_lock);
3225 goto out_clear_layoutstats;
3226 }
3227 hdr = NFS_I(inode)->layout;
3228 pnfs_get_layout_hdr(hdr);
3229 spin_unlock(&inode->i_lock);
3230
3231 data = kzalloc(sizeof(*data), gfp_flags);
3232 if (!data) {
3233 status = -ENOMEM;
3234 goto out_put;
3235 }
3236
3237 data->args.fh = NFS_FH(inode);
3238 data->args.inode = inode;
3239 status = ld->prepare_layoutstats(&data->args);
3240 if (status)
3241 goto out_free;
3242
3243 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3244
3245out:
3246 dprintk("%s returns %d\n", __func__, status);
3247 return status;
3248
3249out_free:
3250 kfree(data);
3251out_put:
3252 pnfs_put_layout_hdr(hdr);
3253out_clear_layoutstats:
3254 smp_mb__before_atomic();
3255 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3256 smp_mb__after_atomic();
3257 goto out;
3258}
3259EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3260#endif
3261
3262unsigned int layoutstats_timer;
3263module_param(layoutstats_timer, uint, 0644);
3264EXPORT_SYMBOL_GPL(layoutstats_timer);