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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 "internal.h"
33#include "pnfs.h"
34#include "iostat.h"
35
36#define NFSDBG_FACILITY NFSDBG_PNFS
37
38/* Locking:
39 *
40 * pnfs_spinlock:
41 * protects pnfs_modules_tbl.
42 */
43static DEFINE_SPINLOCK(pnfs_spinlock);
44
45/*
46 * pnfs_modules_tbl holds all pnfs modules
47 */
48static LIST_HEAD(pnfs_modules_tbl);
49
50/* Return the registered pnfs layout driver module matching given id */
51static struct pnfs_layoutdriver_type *
52find_pnfs_driver_locked(u32 id)
53{
54 struct pnfs_layoutdriver_type *local;
55
56 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
57 if (local->id == id)
58 goto out;
59 local = NULL;
60out:
61 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
62 return local;
63}
64
65static struct pnfs_layoutdriver_type *
66find_pnfs_driver(u32 id)
67{
68 struct pnfs_layoutdriver_type *local;
69
70 spin_lock(&pnfs_spinlock);
71 local = find_pnfs_driver_locked(id);
72 spin_unlock(&pnfs_spinlock);
73 return local;
74}
75
76void
77unset_pnfs_layoutdriver(struct nfs_server *nfss)
78{
79 if (nfss->pnfs_curr_ld) {
80 if (nfss->pnfs_curr_ld->clear_layoutdriver)
81 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
82 module_put(nfss->pnfs_curr_ld->owner);
83 }
84 nfss->pnfs_curr_ld = NULL;
85}
86
87/*
88 * Try to set the server's pnfs module to the pnfs layout type specified by id.
89 * Currently only one pNFS layout driver per filesystem is supported.
90 *
91 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
92 */
93void
94set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
95 u32 id)
96{
97 struct pnfs_layoutdriver_type *ld_type = NULL;
98
99 if (id == 0)
100 goto out_no_driver;
101 if (!(server->nfs_client->cl_exchange_flags &
102 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
103 printk(KERN_ERR "%s: id %u cl_exchange_flags 0x%x\n", __func__,
104 id, server->nfs_client->cl_exchange_flags);
105 goto out_no_driver;
106 }
107 ld_type = find_pnfs_driver(id);
108 if (!ld_type) {
109 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
110 ld_type = find_pnfs_driver(id);
111 if (!ld_type) {
112 dprintk("%s: No pNFS module found for %u.\n",
113 __func__, id);
114 goto out_no_driver;
115 }
116 }
117 if (!try_module_get(ld_type->owner)) {
118 dprintk("%s: Could not grab reference on module\n", __func__);
119 goto out_no_driver;
120 }
121 server->pnfs_curr_ld = ld_type;
122 if (ld_type->set_layoutdriver
123 && ld_type->set_layoutdriver(server, mntfh)) {
124 printk(KERN_ERR "%s: Error initializing pNFS layout driver %u.\n",
125 __func__, id);
126 module_put(ld_type->owner);
127 goto out_no_driver;
128 }
129
130 dprintk("%s: pNFS module for %u set\n", __func__, id);
131 return;
132
133out_no_driver:
134 dprintk("%s: Using NFSv4 I/O\n", __func__);
135 server->pnfs_curr_ld = NULL;
136}
137
138int
139pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
140{
141 int status = -EINVAL;
142 struct pnfs_layoutdriver_type *tmp;
143
144 if (ld_type->id == 0) {
145 printk(KERN_ERR "%s id 0 is reserved\n", __func__);
146 return status;
147 }
148 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
149 printk(KERN_ERR "%s Layout driver must provide "
150 "alloc_lseg and free_lseg.\n", __func__);
151 return status;
152 }
153
154 spin_lock(&pnfs_spinlock);
155 tmp = find_pnfs_driver_locked(ld_type->id);
156 if (!tmp) {
157 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
158 status = 0;
159 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
160 ld_type->name);
161 } else {
162 printk(KERN_ERR "%s Module with id %d already loaded!\n",
163 __func__, ld_type->id);
164 }
165 spin_unlock(&pnfs_spinlock);
166
167 return status;
168}
169EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
170
171void
172pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
173{
174 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
175 spin_lock(&pnfs_spinlock);
176 list_del(&ld_type->pnfs_tblid);
177 spin_unlock(&pnfs_spinlock);
178}
179EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
180
181/*
182 * pNFS client layout cache
183 */
184
185/* Need to hold i_lock if caller does not already hold reference */
186void
187get_layout_hdr(struct pnfs_layout_hdr *lo)
188{
189 atomic_inc(&lo->plh_refcount);
190}
191
192static struct pnfs_layout_hdr *
193pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
194{
195 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
196 return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) :
197 kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags);
198}
199
200static void
201pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
202{
203 struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld;
204 put_rpccred(lo->plh_lc_cred);
205 return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo);
206}
207
208static void
209destroy_layout_hdr(struct pnfs_layout_hdr *lo)
210{
211 dprintk("%s: freeing layout cache %p\n", __func__, lo);
212 BUG_ON(!list_empty(&lo->plh_layouts));
213 NFS_I(lo->plh_inode)->layout = NULL;
214 pnfs_free_layout_hdr(lo);
215}
216
217static void
218put_layout_hdr_locked(struct pnfs_layout_hdr *lo)
219{
220 if (atomic_dec_and_test(&lo->plh_refcount))
221 destroy_layout_hdr(lo);
222}
223
224void
225put_layout_hdr(struct pnfs_layout_hdr *lo)
226{
227 struct inode *inode = lo->plh_inode;
228
229 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
230 destroy_layout_hdr(lo);
231 spin_unlock(&inode->i_lock);
232 }
233}
234
235static void
236init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
237{
238 INIT_LIST_HEAD(&lseg->pls_list);
239 INIT_LIST_HEAD(&lseg->pls_lc_list);
240 atomic_set(&lseg->pls_refcount, 1);
241 smp_mb();
242 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
243 lseg->pls_layout = lo;
244}
245
246static void free_lseg(struct pnfs_layout_segment *lseg)
247{
248 struct inode *ino = lseg->pls_layout->plh_inode;
249
250 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
251 /* Matched by get_layout_hdr in pnfs_insert_layout */
252 put_layout_hdr(NFS_I(ino)->layout);
253}
254
255static void
256put_lseg_common(struct pnfs_layout_segment *lseg)
257{
258 struct inode *inode = lseg->pls_layout->plh_inode;
259
260 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
261 list_del_init(&lseg->pls_list);
262 if (list_empty(&lseg->pls_layout->plh_segs)) {
263 set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags);
264 /* Matched by initial refcount set in alloc_init_layout_hdr */
265 put_layout_hdr_locked(lseg->pls_layout);
266 }
267 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
268}
269
270void
271put_lseg(struct pnfs_layout_segment *lseg)
272{
273 struct inode *inode;
274
275 if (!lseg)
276 return;
277
278 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
279 atomic_read(&lseg->pls_refcount),
280 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
281 inode = lseg->pls_layout->plh_inode;
282 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
283 LIST_HEAD(free_me);
284
285 put_lseg_common(lseg);
286 list_add(&lseg->pls_list, &free_me);
287 spin_unlock(&inode->i_lock);
288 pnfs_free_lseg_list(&free_me);
289 }
290}
291EXPORT_SYMBOL_GPL(put_lseg);
292
293static inline u64
294end_offset(u64 start, u64 len)
295{
296 u64 end;
297
298 end = start + len;
299 return end >= start ? end : NFS4_MAX_UINT64;
300}
301
302/* last octet in a range */
303static inline u64
304last_byte_offset(u64 start, u64 len)
305{
306 u64 end;
307
308 BUG_ON(!len);
309 end = start + len;
310 return end > start ? end - 1 : NFS4_MAX_UINT64;
311}
312
313/*
314 * is l2 fully contained in l1?
315 * start1 end1
316 * [----------------------------------)
317 * start2 end2
318 * [----------------)
319 */
320static inline int
321lo_seg_contained(struct pnfs_layout_range *l1,
322 struct pnfs_layout_range *l2)
323{
324 u64 start1 = l1->offset;
325 u64 end1 = end_offset(start1, l1->length);
326 u64 start2 = l2->offset;
327 u64 end2 = end_offset(start2, l2->length);
328
329 return (start1 <= start2) && (end1 >= end2);
330}
331
332/*
333 * is l1 and l2 intersecting?
334 * start1 end1
335 * [----------------------------------)
336 * start2 end2
337 * [----------------)
338 */
339static inline int
340lo_seg_intersecting(struct pnfs_layout_range *l1,
341 struct pnfs_layout_range *l2)
342{
343 u64 start1 = l1->offset;
344 u64 end1 = end_offset(start1, l1->length);
345 u64 start2 = l2->offset;
346 u64 end2 = end_offset(start2, l2->length);
347
348 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
349 (end2 == NFS4_MAX_UINT64 || end2 > start1);
350}
351
352static bool
353should_free_lseg(struct pnfs_layout_range *lseg_range,
354 struct pnfs_layout_range *recall_range)
355{
356 return (recall_range->iomode == IOMODE_ANY ||
357 lseg_range->iomode == recall_range->iomode) &&
358 lo_seg_intersecting(lseg_range, recall_range);
359}
360
361/* Returns 1 if lseg is removed from list, 0 otherwise */
362static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
363 struct list_head *tmp_list)
364{
365 int rv = 0;
366
367 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
368 /* Remove the reference keeping the lseg in the
369 * list. It will now be removed when all
370 * outstanding io is finished.
371 */
372 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
373 atomic_read(&lseg->pls_refcount));
374 if (atomic_dec_and_test(&lseg->pls_refcount)) {
375 put_lseg_common(lseg);
376 list_add(&lseg->pls_list, tmp_list);
377 rv = 1;
378 }
379 }
380 return rv;
381}
382
383/* Returns count of number of matching invalid lsegs remaining in list
384 * after call.
385 */
386int
387mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
388 struct list_head *tmp_list,
389 struct pnfs_layout_range *recall_range)
390{
391 struct pnfs_layout_segment *lseg, *next;
392 int invalid = 0, removed = 0;
393
394 dprintk("%s:Begin lo %p\n", __func__, lo);
395
396 if (list_empty(&lo->plh_segs)) {
397 if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags))
398 put_layout_hdr_locked(lo);
399 return 0;
400 }
401 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
402 if (!recall_range ||
403 should_free_lseg(&lseg->pls_range, recall_range)) {
404 dprintk("%s: freeing lseg %p iomode %d "
405 "offset %llu length %llu\n", __func__,
406 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
407 lseg->pls_range.length);
408 invalid++;
409 removed += mark_lseg_invalid(lseg, tmp_list);
410 }
411 dprintk("%s:Return %i\n", __func__, invalid - removed);
412 return invalid - removed;
413}
414
415/* note free_me must contain lsegs from a single layout_hdr */
416void
417pnfs_free_lseg_list(struct list_head *free_me)
418{
419 struct pnfs_layout_segment *lseg, *tmp;
420 struct pnfs_layout_hdr *lo;
421
422 if (list_empty(free_me))
423 return;
424
425 lo = list_first_entry(free_me, struct pnfs_layout_segment,
426 pls_list)->pls_layout;
427
428 if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) {
429 struct nfs_client *clp;
430
431 clp = NFS_SERVER(lo->plh_inode)->nfs_client;
432 spin_lock(&clp->cl_lock);
433 list_del_init(&lo->plh_layouts);
434 spin_unlock(&clp->cl_lock);
435 }
436 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
437 list_del(&lseg->pls_list);
438 free_lseg(lseg);
439 }
440}
441
442void
443pnfs_destroy_layout(struct nfs_inode *nfsi)
444{
445 struct pnfs_layout_hdr *lo;
446 LIST_HEAD(tmp_list);
447
448 spin_lock(&nfsi->vfs_inode.i_lock);
449 lo = nfsi->layout;
450 if (lo) {
451 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
452 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
453 }
454 spin_unlock(&nfsi->vfs_inode.i_lock);
455 pnfs_free_lseg_list(&tmp_list);
456}
457
458/*
459 * Called by the state manger to remove all layouts established under an
460 * expired lease.
461 */
462void
463pnfs_destroy_all_layouts(struct nfs_client *clp)
464{
465 struct nfs_server *server;
466 struct pnfs_layout_hdr *lo;
467 LIST_HEAD(tmp_list);
468
469 nfs4_deviceid_mark_client_invalid(clp);
470 nfs4_deviceid_purge_client(clp);
471
472 spin_lock(&clp->cl_lock);
473 rcu_read_lock();
474 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
475 if (!list_empty(&server->layouts))
476 list_splice_init(&server->layouts, &tmp_list);
477 }
478 rcu_read_unlock();
479 spin_unlock(&clp->cl_lock);
480
481 while (!list_empty(&tmp_list)) {
482 lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
483 plh_layouts);
484 dprintk("%s freeing layout for inode %lu\n", __func__,
485 lo->plh_inode->i_ino);
486 list_del_init(&lo->plh_layouts);
487 pnfs_destroy_layout(NFS_I(lo->plh_inode));
488 }
489}
490
491/* update lo->plh_stateid with new if is more recent */
492void
493pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
494 bool update_barrier)
495{
496 u32 oldseq, newseq;
497
498 oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid);
499 newseq = be32_to_cpu(new->stateid.seqid);
500 if ((int)(newseq - oldseq) > 0) {
501 memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid));
502 if (update_barrier) {
503 u32 new_barrier = be32_to_cpu(new->stateid.seqid);
504
505 if ((int)(new_barrier - lo->plh_barrier))
506 lo->plh_barrier = new_barrier;
507 } else {
508 /* Because of wraparound, we want to keep the barrier
509 * "close" to the current seqids. It needs to be
510 * within 2**31 to count as "behind", so if it
511 * gets too near that limit, give us a litle leeway
512 * and bring it to within 2**30.
513 * NOTE - and yes, this is all unsigned arithmetic.
514 */
515 if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
516 lo->plh_barrier = newseq - (1 << 30);
517 }
518 }
519}
520
521/* lget is set to 1 if called from inside send_layoutget call chain */
522static bool
523pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
524 int lget)
525{
526 if ((stateid) &&
527 (int)(lo->plh_barrier - be32_to_cpu(stateid->stateid.seqid)) >= 0)
528 return true;
529 return lo->plh_block_lgets ||
530 test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) ||
531 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
532 (list_empty(&lo->plh_segs) &&
533 (atomic_read(&lo->plh_outstanding) > lget));
534}
535
536int
537pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
538 struct nfs4_state *open_state)
539{
540 int status = 0;
541
542 dprintk("--> %s\n", __func__);
543 spin_lock(&lo->plh_inode->i_lock);
544 if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
545 status = -EAGAIN;
546 } else if (list_empty(&lo->plh_segs)) {
547 int seq;
548
549 do {
550 seq = read_seqbegin(&open_state->seqlock);
551 memcpy(dst->data, open_state->stateid.data,
552 sizeof(open_state->stateid.data));
553 } while (read_seqretry(&open_state->seqlock, seq));
554 } else
555 memcpy(dst->data, lo->plh_stateid.data, sizeof(lo->plh_stateid.data));
556 spin_unlock(&lo->plh_inode->i_lock);
557 dprintk("<-- %s\n", __func__);
558 return status;
559}
560
561/*
562* Get layout from server.
563* for now, assume that whole file layouts are requested.
564* arg->offset: 0
565* arg->length: all ones
566*/
567static struct pnfs_layout_segment *
568send_layoutget(struct pnfs_layout_hdr *lo,
569 struct nfs_open_context *ctx,
570 struct pnfs_layout_range *range,
571 gfp_t gfp_flags)
572{
573 struct inode *ino = lo->plh_inode;
574 struct nfs_server *server = NFS_SERVER(ino);
575 struct nfs4_layoutget *lgp;
576 struct pnfs_layout_segment *lseg = NULL;
577 struct page **pages = NULL;
578 int i;
579 u32 max_resp_sz, max_pages;
580
581 dprintk("--> %s\n", __func__);
582
583 BUG_ON(ctx == NULL);
584 lgp = kzalloc(sizeof(*lgp), gfp_flags);
585 if (lgp == NULL)
586 return NULL;
587
588 /* allocate pages for xdr post processing */
589 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
590 max_pages = max_resp_sz >> PAGE_SHIFT;
591
592 pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags);
593 if (!pages)
594 goto out_err_free;
595
596 for (i = 0; i < max_pages; i++) {
597 pages[i] = alloc_page(gfp_flags);
598 if (!pages[i])
599 goto out_err_free;
600 }
601
602 lgp->args.minlength = PAGE_CACHE_SIZE;
603 if (lgp->args.minlength > range->length)
604 lgp->args.minlength = range->length;
605 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
606 lgp->args.range = *range;
607 lgp->args.type = server->pnfs_curr_ld->id;
608 lgp->args.inode = ino;
609 lgp->args.ctx = get_nfs_open_context(ctx);
610 lgp->args.layout.pages = pages;
611 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
612 lgp->lsegpp = &lseg;
613 lgp->gfp_flags = gfp_flags;
614
615 /* Synchronously retrieve layout information from server and
616 * store in lseg.
617 */
618 nfs4_proc_layoutget(lgp);
619 if (!lseg) {
620 /* remember that LAYOUTGET failed and suspend trying */
621 set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
622 }
623
624 /* free xdr pages */
625 for (i = 0; i < max_pages; i++)
626 __free_page(pages[i]);
627 kfree(pages);
628
629 return lseg;
630
631out_err_free:
632 /* free any allocated xdr pages, lgp as it's not used */
633 if (pages) {
634 for (i = 0; i < max_pages; i++) {
635 if (!pages[i])
636 break;
637 __free_page(pages[i]);
638 }
639 kfree(pages);
640 }
641 kfree(lgp);
642 return NULL;
643}
644
645/* Initiates a LAYOUTRETURN(FILE) */
646int
647_pnfs_return_layout(struct inode *ino)
648{
649 struct pnfs_layout_hdr *lo = NULL;
650 struct nfs_inode *nfsi = NFS_I(ino);
651 LIST_HEAD(tmp_list);
652 struct nfs4_layoutreturn *lrp;
653 nfs4_stateid stateid;
654 int status = 0;
655
656 dprintk("--> %s\n", __func__);
657
658 spin_lock(&ino->i_lock);
659 lo = nfsi->layout;
660 if (!lo) {
661 spin_unlock(&ino->i_lock);
662 dprintk("%s: no layout to return\n", __func__);
663 return status;
664 }
665 stateid = nfsi->layout->plh_stateid;
666 /* Reference matched in nfs4_layoutreturn_release */
667 get_layout_hdr(lo);
668 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
669 lo->plh_block_lgets++;
670 spin_unlock(&ino->i_lock);
671 pnfs_free_lseg_list(&tmp_list);
672
673 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));
674
675 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
676 if (unlikely(lrp == NULL)) {
677 status = -ENOMEM;
678 set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
679 set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
680 put_layout_hdr(lo);
681 goto out;
682 }
683
684 lrp->args.stateid = stateid;
685 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
686 lrp->args.inode = ino;
687 lrp->args.layout = lo;
688 lrp->clp = NFS_SERVER(ino)->nfs_client;
689
690 status = nfs4_proc_layoutreturn(lrp);
691out:
692 dprintk("<-- %s status: %d\n", __func__, status);
693 return status;
694}
695
696bool pnfs_roc(struct inode *ino)
697{
698 struct pnfs_layout_hdr *lo;
699 struct pnfs_layout_segment *lseg, *tmp;
700 LIST_HEAD(tmp_list);
701 bool found = false;
702
703 spin_lock(&ino->i_lock);
704 lo = NFS_I(ino)->layout;
705 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
706 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
707 goto out_nolayout;
708 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
709 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
710 mark_lseg_invalid(lseg, &tmp_list);
711 found = true;
712 }
713 if (!found)
714 goto out_nolayout;
715 lo->plh_block_lgets++;
716 get_layout_hdr(lo); /* matched in pnfs_roc_release */
717 spin_unlock(&ino->i_lock);
718 pnfs_free_lseg_list(&tmp_list);
719 return true;
720
721out_nolayout:
722 spin_unlock(&ino->i_lock);
723 return false;
724}
725
726void pnfs_roc_release(struct inode *ino)
727{
728 struct pnfs_layout_hdr *lo;
729
730 spin_lock(&ino->i_lock);
731 lo = NFS_I(ino)->layout;
732 lo->plh_block_lgets--;
733 put_layout_hdr_locked(lo);
734 spin_unlock(&ino->i_lock);
735}
736
737void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
738{
739 struct pnfs_layout_hdr *lo;
740
741 spin_lock(&ino->i_lock);
742 lo = NFS_I(ino)->layout;
743 if ((int)(barrier - lo->plh_barrier) > 0)
744 lo->plh_barrier = barrier;
745 spin_unlock(&ino->i_lock);
746}
747
748bool pnfs_roc_drain(struct inode *ino, u32 *barrier)
749{
750 struct nfs_inode *nfsi = NFS_I(ino);
751 struct pnfs_layout_segment *lseg;
752 bool found = false;
753
754 spin_lock(&ino->i_lock);
755 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
756 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
757 found = true;
758 break;
759 }
760 if (!found) {
761 struct pnfs_layout_hdr *lo = nfsi->layout;
762 u32 current_seqid = be32_to_cpu(lo->plh_stateid.stateid.seqid);
763
764 /* Since close does not return a layout stateid for use as
765 * a barrier, we choose the worst-case barrier.
766 */
767 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
768 }
769 spin_unlock(&ino->i_lock);
770 return found;
771}
772
773/*
774 * Compare two layout segments for sorting into layout cache.
775 * We want to preferentially return RW over RO layouts, so ensure those
776 * are seen first.
777 */
778static s64
779cmp_layout(struct pnfs_layout_range *l1,
780 struct pnfs_layout_range *l2)
781{
782 s64 d;
783
784 /* high offset > low offset */
785 d = l1->offset - l2->offset;
786 if (d)
787 return d;
788
789 /* short length > long length */
790 d = l2->length - l1->length;
791 if (d)
792 return d;
793
794 /* read > read/write */
795 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
796}
797
798static void
799pnfs_insert_layout(struct pnfs_layout_hdr *lo,
800 struct pnfs_layout_segment *lseg)
801{
802 struct pnfs_layout_segment *lp;
803
804 dprintk("%s:Begin\n", __func__);
805
806 assert_spin_locked(&lo->plh_inode->i_lock);
807 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
808 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
809 continue;
810 list_add_tail(&lseg->pls_list, &lp->pls_list);
811 dprintk("%s: inserted lseg %p "
812 "iomode %d offset %llu length %llu before "
813 "lp %p iomode %d offset %llu length %llu\n",
814 __func__, lseg, lseg->pls_range.iomode,
815 lseg->pls_range.offset, lseg->pls_range.length,
816 lp, lp->pls_range.iomode, lp->pls_range.offset,
817 lp->pls_range.length);
818 goto out;
819 }
820 list_add_tail(&lseg->pls_list, &lo->plh_segs);
821 dprintk("%s: inserted lseg %p "
822 "iomode %d offset %llu length %llu at tail\n",
823 __func__, lseg, lseg->pls_range.iomode,
824 lseg->pls_range.offset, lseg->pls_range.length);
825out:
826 get_layout_hdr(lo);
827
828 dprintk("%s:Return\n", __func__);
829}
830
831static struct pnfs_layout_hdr *
832alloc_init_layout_hdr(struct inode *ino,
833 struct nfs_open_context *ctx,
834 gfp_t gfp_flags)
835{
836 struct pnfs_layout_hdr *lo;
837
838 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
839 if (!lo)
840 return NULL;
841 atomic_set(&lo->plh_refcount, 1);
842 INIT_LIST_HEAD(&lo->plh_layouts);
843 INIT_LIST_HEAD(&lo->plh_segs);
844 INIT_LIST_HEAD(&lo->plh_bulk_recall);
845 lo->plh_inode = ino;
846 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
847 return lo;
848}
849
850static struct pnfs_layout_hdr *
851pnfs_find_alloc_layout(struct inode *ino,
852 struct nfs_open_context *ctx,
853 gfp_t gfp_flags)
854{
855 struct nfs_inode *nfsi = NFS_I(ino);
856 struct pnfs_layout_hdr *new = NULL;
857
858 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
859
860 assert_spin_locked(&ino->i_lock);
861 if (nfsi->layout) {
862 if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
863 return NULL;
864 else
865 return nfsi->layout;
866 }
867 spin_unlock(&ino->i_lock);
868 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
869 spin_lock(&ino->i_lock);
870
871 if (likely(nfsi->layout == NULL)) /* Won the race? */
872 nfsi->layout = new;
873 else
874 pnfs_free_layout_hdr(new);
875 return nfsi->layout;
876}
877
878/*
879 * iomode matching rules:
880 * iomode lseg match
881 * ----- ----- -----
882 * ANY READ true
883 * ANY RW true
884 * RW READ false
885 * RW RW true
886 * READ READ true
887 * READ RW true
888 */
889static int
890is_matching_lseg(struct pnfs_layout_range *ls_range,
891 struct pnfs_layout_range *range)
892{
893 struct pnfs_layout_range range1;
894
895 if ((range->iomode == IOMODE_RW &&
896 ls_range->iomode != IOMODE_RW) ||
897 !lo_seg_intersecting(ls_range, range))
898 return 0;
899
900 /* range1 covers only the first byte in the range */
901 range1 = *range;
902 range1.length = 1;
903 return lo_seg_contained(ls_range, &range1);
904}
905
906/*
907 * lookup range in layout
908 */
909static struct pnfs_layout_segment *
910pnfs_find_lseg(struct pnfs_layout_hdr *lo,
911 struct pnfs_layout_range *range)
912{
913 struct pnfs_layout_segment *lseg, *ret = NULL;
914
915 dprintk("%s:Begin\n", __func__);
916
917 assert_spin_locked(&lo->plh_inode->i_lock);
918 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
919 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
920 is_matching_lseg(&lseg->pls_range, range)) {
921 ret = get_lseg(lseg);
922 break;
923 }
924 if (lseg->pls_range.offset > range->offset)
925 break;
926 }
927
928 dprintk("%s:Return lseg %p ref %d\n",
929 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
930 return ret;
931}
932
933/*
934 * Layout segment is retreived from the server if not cached.
935 * The appropriate layout segment is referenced and returned to the caller.
936 */
937struct pnfs_layout_segment *
938pnfs_update_layout(struct inode *ino,
939 struct nfs_open_context *ctx,
940 loff_t pos,
941 u64 count,
942 enum pnfs_iomode iomode,
943 gfp_t gfp_flags)
944{
945 struct pnfs_layout_range arg = {
946 .iomode = iomode,
947 .offset = pos,
948 .length = count,
949 };
950 unsigned pg_offset;
951 struct nfs_inode *nfsi = NFS_I(ino);
952 struct nfs_server *server = NFS_SERVER(ino);
953 struct nfs_client *clp = server->nfs_client;
954 struct pnfs_layout_hdr *lo;
955 struct pnfs_layout_segment *lseg = NULL;
956 bool first = false;
957
958 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
959 return NULL;
960 spin_lock(&ino->i_lock);
961 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
962 if (lo == NULL) {
963 dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__);
964 goto out_unlock;
965 }
966
967 /* Do we even need to bother with this? */
968 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
969 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
970 dprintk("%s matches recall, use MDS\n", __func__);
971 goto out_unlock;
972 }
973
974 /* if LAYOUTGET already failed once we don't try again */
975 if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags))
976 goto out_unlock;
977
978 /* Check to see if the layout for the given range already exists */
979 lseg = pnfs_find_lseg(lo, &arg);
980 if (lseg)
981 goto out_unlock;
982
983 if (pnfs_layoutgets_blocked(lo, NULL, 0))
984 goto out_unlock;
985 atomic_inc(&lo->plh_outstanding);
986
987 get_layout_hdr(lo);
988 if (list_empty(&lo->plh_segs))
989 first = true;
990 spin_unlock(&ino->i_lock);
991 if (first) {
992 /* The lo must be on the clp list if there is any
993 * chance of a CB_LAYOUTRECALL(FILE) coming in.
994 */
995 spin_lock(&clp->cl_lock);
996 BUG_ON(!list_empty(&lo->plh_layouts));
997 list_add_tail(&lo->plh_layouts, &server->layouts);
998 spin_unlock(&clp->cl_lock);
999 }
1000
1001 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1002 if (pg_offset) {
1003 arg.offset -= pg_offset;
1004 arg.length += pg_offset;
1005 }
1006 if (arg.length != NFS4_MAX_UINT64)
1007 arg.length = PAGE_CACHE_ALIGN(arg.length);
1008
1009 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1010 if (!lseg && first) {
1011 spin_lock(&clp->cl_lock);
1012 list_del_init(&lo->plh_layouts);
1013 spin_unlock(&clp->cl_lock);
1014 }
1015 atomic_dec(&lo->plh_outstanding);
1016 put_layout_hdr(lo);
1017out:
1018 dprintk("%s end, state 0x%lx lseg %p\n", __func__,
1019 nfsi->layout ? nfsi->layout->plh_flags : -1, lseg);
1020 return lseg;
1021out_unlock:
1022 spin_unlock(&ino->i_lock);
1023 goto out;
1024}
1025EXPORT_SYMBOL_GPL(pnfs_update_layout);
1026
1027int
1028pnfs_layout_process(struct nfs4_layoutget *lgp)
1029{
1030 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1031 struct nfs4_layoutget_res *res = &lgp->res;
1032 struct pnfs_layout_segment *lseg;
1033 struct inode *ino = lo->plh_inode;
1034 struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
1035 int status = 0;
1036
1037 /* Inject layout blob into I/O device driver */
1038 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1039 if (!lseg || IS_ERR(lseg)) {
1040 if (!lseg)
1041 status = -ENOMEM;
1042 else
1043 status = PTR_ERR(lseg);
1044 dprintk("%s: Could not allocate layout: error %d\n",
1045 __func__, status);
1046 goto out;
1047 }
1048
1049 spin_lock(&ino->i_lock);
1050 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
1051 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1052 dprintk("%s forget reply due to recall\n", __func__);
1053 goto out_forget_reply;
1054 }
1055
1056 if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) {
1057 dprintk("%s forget reply due to state\n", __func__);
1058 goto out_forget_reply;
1059 }
1060 init_lseg(lo, lseg);
1061 lseg->pls_range = res->range;
1062 *lgp->lsegpp = get_lseg(lseg);
1063 pnfs_insert_layout(lo, lseg);
1064
1065 if (res->return_on_close) {
1066 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1067 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1068 }
1069
1070 /* Done processing layoutget. Set the layout stateid */
1071 pnfs_set_layout_stateid(lo, &res->stateid, false);
1072 spin_unlock(&ino->i_lock);
1073out:
1074 return status;
1075
1076out_forget_reply:
1077 spin_unlock(&ino->i_lock);
1078 lseg->pls_layout = lo;
1079 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1080 goto out;
1081}
1082
1083void
1084pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1085{
1086 BUG_ON(pgio->pg_lseg != NULL);
1087
1088 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1089 req->wb_context,
1090 req_offset(req),
1091 req->wb_bytes,
1092 IOMODE_READ,
1093 GFP_KERNEL);
1094 /* If no lseg, fall back to read through mds */
1095 if (pgio->pg_lseg == NULL)
1096 nfs_pageio_reset_read_mds(pgio);
1097
1098}
1099EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1100
1101void
1102pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1103{
1104 BUG_ON(pgio->pg_lseg != NULL);
1105
1106 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1107 req->wb_context,
1108 req_offset(req),
1109 req->wb_bytes,
1110 IOMODE_RW,
1111 GFP_NOFS);
1112 /* If no lseg, fall back to write through mds */
1113 if (pgio->pg_lseg == NULL)
1114 nfs_pageio_reset_write_mds(pgio);
1115}
1116EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1117
1118bool
1119pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
1120{
1121 struct nfs_server *server = NFS_SERVER(inode);
1122 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1123
1124 if (ld == NULL)
1125 return false;
1126 nfs_pageio_init(pgio, inode, ld->pg_read_ops, server->rsize, 0);
1127 return true;
1128}
1129
1130bool
1131pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
1132{
1133 struct nfs_server *server = NFS_SERVER(inode);
1134 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1135
1136 if (ld == NULL)
1137 return false;
1138 nfs_pageio_init(pgio, inode, ld->pg_write_ops, server->wsize, ioflags);
1139 return true;
1140}
1141
1142bool
1143pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1144 struct nfs_page *req)
1145{
1146 if (pgio->pg_lseg == NULL)
1147 return nfs_generic_pg_test(pgio, prev, req);
1148
1149 /*
1150 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1151 * Note that this test makes several assumptions:
1152 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1153 * is known to lie within the range.
1154 * - that the nfs_page being tested is known to be contiguous with the
1155 * previous nfs_page.
1156 * - Layout ranges are page aligned, so we only have to test the
1157 * start offset of the request.
1158 *
1159 * Please also note that 'end_offset' is actually the offset of the
1160 * first byte that lies outside the pnfs_layout_range. FIXME?
1161 *
1162 */
1163 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
1164 pgio->pg_lseg->pls_range.length);
1165}
1166EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1167
1168/*
1169 * Called by non rpc-based layout drivers
1170 */
1171int
1172pnfs_ld_write_done(struct nfs_write_data *data)
1173{
1174 int status;
1175
1176 if (!data->pnfs_error) {
1177 pnfs_set_layoutcommit(data);
1178 data->mds_ops->rpc_call_done(&data->task, data);
1179 data->mds_ops->rpc_release(data);
1180 return 0;
1181 }
1182
1183 dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
1184 data->pnfs_error);
1185 status = nfs_initiate_write(data, NFS_CLIENT(data->inode),
1186 data->mds_ops, NFS_FILE_SYNC);
1187 return status ? : -EAGAIN;
1188}
1189EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1190
1191static void
1192pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1193 struct nfs_write_data *data)
1194{
1195 list_splice_tail_init(&data->pages, &desc->pg_list);
1196 if (data->req && list_empty(&data->req->wb_list))
1197 nfs_list_add_request(data->req, &desc->pg_list);
1198 nfs_pageio_reset_write_mds(desc);
1199 desc->pg_recoalesce = 1;
1200 nfs_writedata_release(data);
1201}
1202
1203static enum pnfs_try_status
1204pnfs_try_to_write_data(struct nfs_write_data *wdata,
1205 const struct rpc_call_ops *call_ops,
1206 struct pnfs_layout_segment *lseg,
1207 int how)
1208{
1209 struct inode *inode = wdata->inode;
1210 enum pnfs_try_status trypnfs;
1211 struct nfs_server *nfss = NFS_SERVER(inode);
1212
1213 wdata->mds_ops = call_ops;
1214 wdata->lseg = get_lseg(lseg);
1215
1216 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1217 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1218
1219 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1220 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1221 put_lseg(wdata->lseg);
1222 wdata->lseg = NULL;
1223 } else
1224 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1225
1226 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1227 return trypnfs;
1228}
1229
1230static void
1231pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
1232{
1233 struct nfs_write_data *data;
1234 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1235 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1236
1237 desc->pg_lseg = NULL;
1238 while (!list_empty(head)) {
1239 enum pnfs_try_status trypnfs;
1240
1241 data = list_entry(head->next, struct nfs_write_data, list);
1242 list_del_init(&data->list);
1243
1244 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
1245 if (trypnfs == PNFS_NOT_ATTEMPTED)
1246 pnfs_write_through_mds(desc, data);
1247 }
1248 put_lseg(lseg);
1249}
1250
1251int
1252pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1253{
1254 LIST_HEAD(head);
1255 int ret;
1256
1257 ret = nfs_generic_flush(desc, &head);
1258 if (ret != 0) {
1259 put_lseg(desc->pg_lseg);
1260 desc->pg_lseg = NULL;
1261 return ret;
1262 }
1263 pnfs_do_multiple_writes(desc, &head, desc->pg_ioflags);
1264 return 0;
1265}
1266EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1267
1268/*
1269 * Called by non rpc-based layout drivers
1270 */
1271int
1272pnfs_ld_read_done(struct nfs_read_data *data)
1273{
1274 int status;
1275
1276 if (!data->pnfs_error) {
1277 __nfs4_read_done_cb(data);
1278 data->mds_ops->rpc_call_done(&data->task, data);
1279 data->mds_ops->rpc_release(data);
1280 return 0;
1281 }
1282
1283 dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
1284 data->pnfs_error);
1285 status = nfs_initiate_read(data, NFS_CLIENT(data->inode),
1286 data->mds_ops);
1287 return status ? : -EAGAIN;
1288}
1289EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1290
1291static void
1292pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1293 struct nfs_read_data *data)
1294{
1295 list_splice_tail_init(&data->pages, &desc->pg_list);
1296 if (data->req && list_empty(&data->req->wb_list))
1297 nfs_list_add_request(data->req, &desc->pg_list);
1298 nfs_pageio_reset_read_mds(desc);
1299 desc->pg_recoalesce = 1;
1300 nfs_readdata_release(data);
1301}
1302
1303/*
1304 * Call the appropriate parallel I/O subsystem read function.
1305 */
1306static enum pnfs_try_status
1307pnfs_try_to_read_data(struct nfs_read_data *rdata,
1308 const struct rpc_call_ops *call_ops,
1309 struct pnfs_layout_segment *lseg)
1310{
1311 struct inode *inode = rdata->inode;
1312 struct nfs_server *nfss = NFS_SERVER(inode);
1313 enum pnfs_try_status trypnfs;
1314
1315 rdata->mds_ops = call_ops;
1316 rdata->lseg = get_lseg(lseg);
1317
1318 dprintk("%s: Reading ino:%lu %u@%llu\n",
1319 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1320
1321 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1322 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1323 put_lseg(rdata->lseg);
1324 rdata->lseg = NULL;
1325 } else {
1326 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1327 }
1328 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1329 return trypnfs;
1330}
1331
1332static void
1333pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
1334{
1335 struct nfs_read_data *data;
1336 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1337 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1338
1339 desc->pg_lseg = NULL;
1340 while (!list_empty(head)) {
1341 enum pnfs_try_status trypnfs;
1342
1343 data = list_entry(head->next, struct nfs_read_data, list);
1344 list_del_init(&data->list);
1345
1346 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
1347 if (trypnfs == PNFS_NOT_ATTEMPTED)
1348 pnfs_read_through_mds(desc, data);
1349 }
1350 put_lseg(lseg);
1351}
1352
1353int
1354pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
1355{
1356 LIST_HEAD(head);
1357 int ret;
1358
1359 ret = nfs_generic_pagein(desc, &head);
1360 if (ret != 0) {
1361 put_lseg(desc->pg_lseg);
1362 desc->pg_lseg = NULL;
1363 return ret;
1364 }
1365 pnfs_do_multiple_reads(desc, &head);
1366 return 0;
1367}
1368EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
1369
1370/*
1371 * There can be multiple RW segments.
1372 */
1373static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
1374{
1375 struct pnfs_layout_segment *lseg;
1376
1377 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
1378 if (lseg->pls_range.iomode == IOMODE_RW &&
1379 test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1380 list_add(&lseg->pls_lc_list, listp);
1381 }
1382}
1383
1384void
1385pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1386{
1387 struct nfs_inode *nfsi = NFS_I(wdata->inode);
1388 loff_t end_pos = wdata->mds_offset + wdata->res.count;
1389 bool mark_as_dirty = false;
1390
1391 spin_lock(&nfsi->vfs_inode.i_lock);
1392 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1393 mark_as_dirty = true;
1394 dprintk("%s: Set layoutcommit for inode %lu ",
1395 __func__, wdata->inode->i_ino);
1396 }
1397 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &wdata->lseg->pls_flags)) {
1398 /* references matched in nfs4_layoutcommit_release */
1399 get_lseg(wdata->lseg);
1400 }
1401 if (end_pos > nfsi->layout->plh_lwb)
1402 nfsi->layout->plh_lwb = end_pos;
1403 spin_unlock(&nfsi->vfs_inode.i_lock);
1404 dprintk("%s: lseg %p end_pos %llu\n",
1405 __func__, wdata->lseg, nfsi->layout->plh_lwb);
1406
1407 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1408 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1409 if (mark_as_dirty)
1410 mark_inode_dirty_sync(wdata->inode);
1411}
1412EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1413
1414void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
1415{
1416 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
1417
1418 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
1419 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
1420}
1421
1422/*
1423 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1424 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1425 * data to disk to allow the server to recover the data if it crashes.
1426 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1427 * is off, and a COMMIT is sent to a data server, or
1428 * if WRITEs to a data server return NFS_DATA_SYNC.
1429 */
1430int
1431pnfs_layoutcommit_inode(struct inode *inode, bool sync)
1432{
1433 struct nfs4_layoutcommit_data *data;
1434 struct nfs_inode *nfsi = NFS_I(inode);
1435 loff_t end_pos;
1436 int status = 0;
1437
1438 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1439
1440 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1441 return 0;
1442
1443 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1444 data = kzalloc(sizeof(*data), GFP_NOFS);
1445 if (!data) {
1446 mark_inode_dirty_sync(inode);
1447 status = -ENOMEM;
1448 goto out;
1449 }
1450
1451 INIT_LIST_HEAD(&data->lseg_list);
1452 spin_lock(&inode->i_lock);
1453 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1454 spin_unlock(&inode->i_lock);
1455 kfree(data);
1456 goto out;
1457 }
1458
1459 pnfs_list_write_lseg(inode, &data->lseg_list);
1460
1461 end_pos = nfsi->layout->plh_lwb;
1462 nfsi->layout->plh_lwb = 0;
1463
1464 memcpy(&data->args.stateid.data, nfsi->layout->plh_stateid.data,
1465 sizeof(nfsi->layout->plh_stateid.data));
1466 spin_unlock(&inode->i_lock);
1467
1468 data->args.inode = inode;
1469 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
1470 nfs_fattr_init(&data->fattr);
1471 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1472 data->res.fattr = &data->fattr;
1473 data->args.lastbytewritten = end_pos - 1;
1474 data->res.server = NFS_SERVER(inode);
1475
1476 status = nfs4_proc_layoutcommit(data, sync);
1477out:
1478 dprintk("<-- %s status %d\n", __func__, status);
1479 return status;
1480}