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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-2.6-block.git] / fs / nfs / pnfs.c
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1/*
2 * pNFS functions to call and manage layout drivers.
3 *
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#include <linux/nfs_fs.h>
31#include <linux/nfs_page.h>
32#include <linux/module.h>
33#include <linux/sort.h>
34#include "internal.h"
35#include "pnfs.h"
36#include "iostat.h"
37#include "nfs4trace.h"
38#include "delegation.h"
39#include "nfs42.h"
40#include "nfs4_fs.h"
41
42#define NFSDBG_FACILITY NFSDBG_PNFS
43#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
44
45/* Locking:
46 *
47 * pnfs_spinlock:
48 * protects pnfs_modules_tbl.
49 */
50static DEFINE_SPINLOCK(pnfs_spinlock);
51
52/*
53 * pnfs_modules_tbl holds all pnfs modules
54 */
55static LIST_HEAD(pnfs_modules_tbl);
56
57static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
58static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
59 struct list_head *free_me,
60 const struct pnfs_layout_range *range,
61 u32 seq);
62static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
63 struct list_head *tmp_list);
64static int pnfs_layout_return_on_reboot(struct pnfs_layout_hdr *lo);
65
66/* Return the registered pnfs layout driver module matching given id */
67static struct pnfs_layoutdriver_type *
68find_pnfs_driver_locked(u32 id)
69{
70 struct pnfs_layoutdriver_type *local;
71
72 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
73 if (local->id == id)
74 goto out;
75 local = NULL;
76out:
77 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
78 return local;
79}
80
81static struct pnfs_layoutdriver_type *
82find_pnfs_driver(u32 id)
83{
84 struct pnfs_layoutdriver_type *local;
85
86 spin_lock(&pnfs_spinlock);
87 local = find_pnfs_driver_locked(id);
88 if (local != NULL && !try_module_get(local->owner)) {
89 dprintk("%s: Could not grab reference on module\n", __func__);
90 local = NULL;
91 }
92 spin_unlock(&pnfs_spinlock);
93 return local;
94}
95
96const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id)
97{
98 return find_pnfs_driver(id);
99}
100
101void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld)
102{
103 if (ld)
104 module_put(ld->owner);
105}
106
107void
108unset_pnfs_layoutdriver(struct nfs_server *nfss)
109{
110 if (nfss->pnfs_curr_ld) {
111 if (nfss->pnfs_curr_ld->clear_layoutdriver)
112 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
113 /* Decrement the MDS count. Purge the deviceid cache if zero */
114 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
115 nfs4_deviceid_purge_client(nfss->nfs_client);
116 module_put(nfss->pnfs_curr_ld->owner);
117 }
118 nfss->pnfs_curr_ld = NULL;
119}
120
121/*
122 * When the server sends a list of layout types, we choose one in the order
123 * given in the list below.
124 *
125 * FIXME: should this list be configurable in some fashion? module param?
126 * mount option? something else?
127 */
128static const u32 ld_prefs[] = {
129 LAYOUT_SCSI,
130 LAYOUT_BLOCK_VOLUME,
131 LAYOUT_OSD2_OBJECTS,
132 LAYOUT_FLEX_FILES,
133 LAYOUT_NFSV4_1_FILES,
134 0
135};
136
137static int
138ld_cmp(const void *e1, const void *e2)
139{
140 u32 ld1 = *((u32 *)e1);
141 u32 ld2 = *((u32 *)e2);
142 int i;
143
144 for (i = 0; ld_prefs[i] != 0; i++) {
145 if (ld1 == ld_prefs[i])
146 return -1;
147
148 if (ld2 == ld_prefs[i])
149 return 1;
150 }
151 return 0;
152}
153
154/*
155 * Try to set the server's pnfs module to the pnfs layout type specified by id.
156 * Currently only one pNFS layout driver per filesystem is supported.
157 *
158 * @ids array of layout types supported by MDS.
159 */
160void
161set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
162 struct nfs_fsinfo *fsinfo)
163{
164 struct pnfs_layoutdriver_type *ld_type = NULL;
165 u32 id;
166 int i;
167
168 if (fsinfo->nlayouttypes == 0)
169 goto out_no_driver;
170 if (!(server->nfs_client->cl_exchange_flags &
171 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
172 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
173 __func__, server->nfs_client->cl_exchange_flags);
174 goto out_no_driver;
175 }
176
177 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
178 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
179
180 for (i = 0; i < fsinfo->nlayouttypes; i++) {
181 id = fsinfo->layouttype[i];
182 ld_type = find_pnfs_driver(id);
183 if (!ld_type) {
184 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
185 id);
186 ld_type = find_pnfs_driver(id);
187 }
188 if (ld_type)
189 break;
190 }
191
192 if (!ld_type) {
193 dprintk("%s: No pNFS module found!\n", __func__);
194 goto out_no_driver;
195 }
196
197 server->pnfs_curr_ld = ld_type;
198 if (ld_type->set_layoutdriver
199 && ld_type->set_layoutdriver(server, mntfh)) {
200 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
201 "driver %u.\n", __func__, id);
202 module_put(ld_type->owner);
203 goto out_no_driver;
204 }
205 /* Bump the MDS count */
206 atomic_inc(&server->nfs_client->cl_mds_count);
207
208 dprintk("%s: pNFS module for %u set\n", __func__, id);
209 return;
210
211out_no_driver:
212 dprintk("%s: Using NFSv4 I/O\n", __func__);
213 server->pnfs_curr_ld = NULL;
214}
215
216int
217pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
218{
219 int status = -EINVAL;
220 struct pnfs_layoutdriver_type *tmp;
221
222 if (ld_type->id == 0) {
223 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
224 return status;
225 }
226 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
227 printk(KERN_ERR "NFS: %s Layout driver must provide "
228 "alloc_lseg and free_lseg.\n", __func__);
229 return status;
230 }
231
232 spin_lock(&pnfs_spinlock);
233 tmp = find_pnfs_driver_locked(ld_type->id);
234 if (!tmp) {
235 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
236 status = 0;
237 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
238 ld_type->name);
239 } else {
240 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
241 __func__, ld_type->id);
242 }
243 spin_unlock(&pnfs_spinlock);
244
245 return status;
246}
247EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
248
249void
250pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
251{
252 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
253 spin_lock(&pnfs_spinlock);
254 list_del(&ld_type->pnfs_tblid);
255 spin_unlock(&pnfs_spinlock);
256}
257EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
258
259/*
260 * pNFS client layout cache
261 */
262
263/* Need to hold i_lock if caller does not already hold reference */
264void
265pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
266{
267 refcount_inc(&lo->plh_refcount);
268}
269
270static struct pnfs_layout_hdr *
271pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
272{
273 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
274 return ld->alloc_layout_hdr(ino, gfp_flags);
275}
276
277static void
278pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
279{
280 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
281 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
282
283 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
284 struct nfs_client *clp = server->nfs_client;
285
286 spin_lock(&clp->cl_lock);
287 list_del_rcu(&lo->plh_layouts);
288 spin_unlock(&clp->cl_lock);
289 }
290 put_cred(lo->plh_lc_cred);
291 return ld->free_layout_hdr(lo);
292}
293
294static void
295pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
296{
297 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
298 dprintk("%s: freeing layout cache %p\n", __func__, lo);
299 nfsi->layout = NULL;
300 /* Reset MDS Threshold I/O counters */
301 nfsi->write_io = 0;
302 nfsi->read_io = 0;
303}
304
305void
306pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
307{
308 struct inode *inode;
309 unsigned long i_state;
310
311 if (!lo)
312 return;
313 inode = lo->plh_inode;
314 pnfs_layoutreturn_before_put_layout_hdr(lo);
315
316 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
317 if (!list_empty(&lo->plh_segs))
318 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
319 pnfs_detach_layout_hdr(lo);
320 i_state = inode->i_state;
321 spin_unlock(&inode->i_lock);
322 pnfs_free_layout_hdr(lo);
323 /* Notify pnfs_destroy_layout_final() that we're done */
324 if (i_state & (I_FREEING | I_CLEAR))
325 wake_up_var(lo);
326 }
327}
328
329static struct inode *
330pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo)
331{
332 struct inode *inode = igrab(lo->plh_inode);
333 if (inode)
334 return inode;
335 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
336 return NULL;
337}
338
339/*
340 * Compare 2 layout stateid sequence ids, to see which is newer,
341 * taking into account wraparound issues.
342 */
343static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
344{
345 return (s32)(s1 - s2) > 0;
346}
347
348static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq)
349{
350 if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier)
351 lo->plh_barrier = newseq;
352}
353
354static void
355pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
356 u32 seq)
357{
358 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
359 iomode = IOMODE_ANY;
360 lo->plh_return_iomode = iomode;
361 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
362 /*
363 * We must set lo->plh_return_seq to avoid livelocks with
364 * pnfs_layout_need_return()
365 */
366 if (seq == 0)
367 seq = be32_to_cpu(lo->plh_stateid.seqid);
368 if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
369 lo->plh_return_seq = seq;
370 pnfs_barrier_update(lo, seq);
371}
372
373static void
374pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
375{
376 struct pnfs_layout_segment *lseg;
377 lo->plh_return_iomode = 0;
378 lo->plh_return_seq = 0;
379 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
380 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
381 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
382 continue;
383 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
384 }
385}
386
387static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
388{
389 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
390 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
391 smp_mb__after_atomic();
392 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
393 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
394}
395
396static void
397pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
398 struct list_head *free_me)
399{
400 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
401 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
402 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
403 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
404 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
405 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
406}
407
408/*
409 * Update the seqid of a layout stateid after receiving
410 * NFS4ERR_OLD_STATEID
411 */
412bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
413 struct pnfs_layout_range *dst_range,
414 struct inode *inode)
415{
416 struct pnfs_layout_hdr *lo;
417 struct pnfs_layout_range range = {
418 .iomode = IOMODE_ANY,
419 .offset = 0,
420 .length = NFS4_MAX_UINT64,
421 };
422 bool ret = false;
423 LIST_HEAD(head);
424 int err;
425
426 spin_lock(&inode->i_lock);
427 lo = NFS_I(inode)->layout;
428 if (lo && pnfs_layout_is_valid(lo) &&
429 nfs4_stateid_match_other(dst, &lo->plh_stateid)) {
430 /* Is our call using the most recent seqid? If so, bump it */
431 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) {
432 nfs4_stateid_seqid_inc(dst);
433 ret = true;
434 goto out;
435 }
436 /* Try to update the seqid to the most recent */
437 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
438 if (err != -EBUSY) {
439 dst->seqid = lo->plh_stateid.seqid;
440 *dst_range = range;
441 ret = true;
442 }
443 }
444out:
445 spin_unlock(&inode->i_lock);
446 pnfs_free_lseg_list(&head);
447 return ret;
448}
449
450/*
451 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
452 *
453 * In order to continue using the pnfs_layout_hdr, a full recovery
454 * is required.
455 * Note that caller must hold inode->i_lock.
456 */
457int
458pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
459 struct list_head *lseg_list)
460{
461 struct pnfs_layout_range range = {
462 .iomode = IOMODE_ANY,
463 .offset = 0,
464 .length = NFS4_MAX_UINT64,
465 };
466 struct pnfs_layout_segment *lseg, *next;
467
468 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
469 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
470 pnfs_clear_lseg_state(lseg, lseg_list);
471 pnfs_clear_layoutreturn_info(lo);
472 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
473 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
474 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
475 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
476 pnfs_clear_layoutreturn_waitbit(lo);
477 return !list_empty(&lo->plh_segs);
478}
479
480static int pnfs_mark_layout_stateid_return(struct pnfs_layout_hdr *lo,
481 struct list_head *lseg_list,
482 enum pnfs_iomode iomode, u32 seq)
483{
484 struct pnfs_layout_range range = {
485 .iomode = iomode,
486 .length = NFS4_MAX_UINT64,
487 };
488
489 return pnfs_mark_matching_lsegs_return(lo, lseg_list, &range, seq);
490}
491
492static int
493pnfs_iomode_to_fail_bit(u32 iomode)
494{
495 return iomode == IOMODE_RW ?
496 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
497}
498
499static void
500pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
501{
502 lo->plh_retry_timestamp = jiffies;
503 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
504 refcount_inc(&lo->plh_refcount);
505}
506
507static void
508pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
509{
510 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
511 refcount_dec(&lo->plh_refcount);
512}
513
514static void
515pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
516{
517 struct inode *inode = lo->plh_inode;
518 struct pnfs_layout_range range = {
519 .iomode = iomode,
520 .offset = 0,
521 .length = NFS4_MAX_UINT64,
522 };
523 LIST_HEAD(head);
524
525 spin_lock(&inode->i_lock);
526 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
527 pnfs_mark_matching_lsegs_return(lo, &head, &range, 0);
528 spin_unlock(&inode->i_lock);
529 pnfs_free_lseg_list(&head);
530 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
531 iomode == IOMODE_RW ? "RW" : "READ");
532}
533
534static bool
535pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
536{
537 unsigned long start, end;
538 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
539
540 if (test_bit(fail_bit, &lo->plh_flags) == 0)
541 return false;
542 end = jiffies;
543 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
544 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
545 /* It is time to retry the failed layoutgets */
546 pnfs_layout_clear_fail_bit(lo, fail_bit);
547 return false;
548 }
549 return true;
550}
551
552static void
553pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
554 const struct pnfs_layout_range *range,
555 const nfs4_stateid *stateid)
556{
557 INIT_LIST_HEAD(&lseg->pls_list);
558 INIT_LIST_HEAD(&lseg->pls_lc_list);
559 INIT_LIST_HEAD(&lseg->pls_commits);
560 refcount_set(&lseg->pls_refcount, 1);
561 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
562 lseg->pls_layout = lo;
563 lseg->pls_range = *range;
564 lseg->pls_seq = be32_to_cpu(stateid->seqid);
565}
566
567static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
568{
569 if (lseg != NULL) {
570 struct inode *inode = lseg->pls_layout->plh_inode;
571 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
572 }
573}
574
575static void
576pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
577 struct pnfs_layout_segment *lseg)
578{
579 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
580 list_del_init(&lseg->pls_list);
581 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
582 refcount_dec(&lo->plh_refcount);
583 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
584 return;
585 if (list_empty(&lo->plh_segs) &&
586 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
587 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
588 if (atomic_read(&lo->plh_outstanding) == 0)
589 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
590 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
591 }
592}
593
594static bool
595pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
596 struct pnfs_layout_segment *lseg)
597{
598 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
599 pnfs_layout_is_valid(lo)) {
600 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
601 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
602 return true;
603 }
604 return false;
605}
606
607void
608pnfs_put_lseg(struct pnfs_layout_segment *lseg)
609{
610 struct pnfs_layout_hdr *lo;
611 struct inode *inode;
612
613 if (!lseg)
614 return;
615
616 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
617 refcount_read(&lseg->pls_refcount),
618 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
619
620 lo = lseg->pls_layout;
621 inode = lo->plh_inode;
622
623 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
624 pnfs_get_layout_hdr(lo);
625 pnfs_layout_remove_lseg(lo, lseg);
626 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
627 lseg = NULL;
628 spin_unlock(&inode->i_lock);
629 pnfs_free_lseg(lseg);
630 pnfs_put_layout_hdr(lo);
631 }
632}
633EXPORT_SYMBOL_GPL(pnfs_put_lseg);
634
635/*
636 * is l2 fully contained in l1?
637 * start1 end1
638 * [----------------------------------)
639 * start2 end2
640 * [----------------)
641 */
642static bool
643pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
644 const struct pnfs_layout_range *l2)
645{
646 u64 start1 = l1->offset;
647 u64 end1 = pnfs_end_offset(start1, l1->length);
648 u64 start2 = l2->offset;
649 u64 end2 = pnfs_end_offset(start2, l2->length);
650
651 return (start1 <= start2) && (end1 >= end2);
652}
653
654static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
655 struct list_head *tmp_list)
656{
657 if (!refcount_dec_and_test(&lseg->pls_refcount))
658 return false;
659 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
660 list_add(&lseg->pls_list, tmp_list);
661 return true;
662}
663
664/* Returns 1 if lseg is removed from list, 0 otherwise */
665static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
666 struct list_head *tmp_list)
667{
668 int rv = 0;
669
670 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
671 /* Remove the reference keeping the lseg in the
672 * list. It will now be removed when all
673 * outstanding io is finished.
674 */
675 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
676 refcount_read(&lseg->pls_refcount));
677 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
678 rv = 1;
679 }
680 return rv;
681}
682
683static bool
684pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
685 const struct pnfs_layout_range *recall_range)
686{
687 return (recall_range->iomode == IOMODE_ANY ||
688 lseg_range->iomode == recall_range->iomode) &&
689 pnfs_lseg_range_intersecting(lseg_range, recall_range);
690}
691
692static bool
693pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
694 const struct pnfs_layout_range *recall_range,
695 u32 seq)
696{
697 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
698 return false;
699 if (recall_range == NULL)
700 return true;
701 return pnfs_should_free_range(&lseg->pls_range, recall_range);
702}
703
704/**
705 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
706 * @lo: layout header containing the lsegs
707 * @tmp_list: list head where doomed lsegs should go
708 * @recall_range: optional recall range argument to match (may be NULL)
709 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
710 *
711 * Walk the list of lsegs in the layout header, and tear down any that should
712 * be destroyed. If "recall_range" is specified then the segment must match
713 * that range. If "seq" is non-zero, then only match segments that were handed
714 * out at or before that sequence.
715 *
716 * Returns number of matching invalid lsegs remaining in list after scanning
717 * it and purging them.
718 */
719int
720pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
721 struct list_head *tmp_list,
722 const struct pnfs_layout_range *recall_range,
723 u32 seq)
724{
725 struct pnfs_layout_segment *lseg, *next;
726 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
727 int remaining = 0;
728
729 dprintk("%s:Begin lo %p\n", __func__, lo);
730
731 if (list_empty(&lo->plh_segs))
732 return 0;
733 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
734 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
735 dprintk("%s: freeing lseg %p iomode %d seq %u "
736 "offset %llu length %llu\n", __func__,
737 lseg, lseg->pls_range.iomode, lseg->pls_seq,
738 lseg->pls_range.offset, lseg->pls_range.length);
739 if (mark_lseg_invalid(lseg, tmp_list))
740 continue;
741 remaining++;
742 pnfs_lseg_cancel_io(server, lseg);
743 }
744 dprintk("%s:Return %i\n", __func__, remaining);
745 return remaining;
746}
747
748static void
749pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
750 struct list_head *free_me,
751 const struct pnfs_layout_range *range,
752 u32 seq)
753{
754 struct pnfs_layout_segment *lseg, *next;
755
756 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
757 if (pnfs_match_lseg_recall(lseg, range, seq))
758 list_move_tail(&lseg->pls_list, free_me);
759 }
760}
761
762/* note free_me must contain lsegs from a single layout_hdr */
763void
764pnfs_free_lseg_list(struct list_head *free_me)
765{
766 struct pnfs_layout_segment *lseg, *tmp;
767
768 if (list_empty(free_me))
769 return;
770
771 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
772 list_del(&lseg->pls_list);
773 pnfs_free_lseg(lseg);
774 }
775}
776
777static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi)
778{
779 struct pnfs_layout_hdr *lo;
780 LIST_HEAD(tmp_list);
781
782 spin_lock(&nfsi->vfs_inode.i_lock);
783 lo = nfsi->layout;
784 if (lo) {
785 pnfs_get_layout_hdr(lo);
786 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
787 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
788 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
789 spin_unlock(&nfsi->vfs_inode.i_lock);
790 pnfs_free_lseg_list(&tmp_list);
791 nfs_commit_inode(&nfsi->vfs_inode, 0);
792 pnfs_put_layout_hdr(lo);
793 } else
794 spin_unlock(&nfsi->vfs_inode.i_lock);
795 return lo;
796}
797
798void pnfs_destroy_layout(struct nfs_inode *nfsi)
799{
800 __pnfs_destroy_layout(nfsi);
801}
802EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
803
804static bool pnfs_layout_removed(struct nfs_inode *nfsi,
805 struct pnfs_layout_hdr *lo)
806{
807 bool ret;
808
809 spin_lock(&nfsi->vfs_inode.i_lock);
810 ret = nfsi->layout != lo;
811 spin_unlock(&nfsi->vfs_inode.i_lock);
812 return ret;
813}
814
815void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
816{
817 struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi);
818
819 if (lo)
820 wait_var_event(lo, pnfs_layout_removed(nfsi, lo));
821}
822
823static bool
824pnfs_layout_add_bulk_destroy_list(struct inode *inode,
825 struct list_head *layout_list)
826{
827 struct pnfs_layout_hdr *lo;
828 bool ret = false;
829
830 spin_lock(&inode->i_lock);
831 lo = NFS_I(inode)->layout;
832 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
833 pnfs_get_layout_hdr(lo);
834 list_add(&lo->plh_bulk_destroy, layout_list);
835 ret = true;
836 }
837 spin_unlock(&inode->i_lock);
838 return ret;
839}
840
841/* Caller must hold rcu_read_lock and clp->cl_lock */
842static int
843pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
844 struct nfs_server *server,
845 struct list_head *layout_list)
846 __must_hold(&clp->cl_lock)
847 __must_hold(RCU)
848{
849 struct pnfs_layout_hdr *lo, *next;
850 struct inode *inode;
851
852 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
853 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
854 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) ||
855 !list_empty(&lo->plh_bulk_destroy))
856 continue;
857 /* If the sb is being destroyed, just bail */
858 if (!nfs_sb_active(server->super))
859 break;
860 inode = pnfs_grab_inode_layout_hdr(lo);
861 if (inode != NULL) {
862 if (pnfs_layout_add_bulk_destroy_list(inode,
863 layout_list))
864 continue;
865 rcu_read_unlock();
866 spin_unlock(&clp->cl_lock);
867 iput(inode);
868 } else {
869 rcu_read_unlock();
870 spin_unlock(&clp->cl_lock);
871 }
872 nfs_sb_deactive(server->super);
873 spin_lock(&clp->cl_lock);
874 rcu_read_lock();
875 return -EAGAIN;
876 }
877 return 0;
878}
879
880static int
881pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
882 enum pnfs_layout_destroy_mode mode)
883{
884 struct pnfs_layout_hdr *lo;
885 struct inode *inode;
886 LIST_HEAD(lseg_list);
887 int ret = 0;
888
889 while (!list_empty(layout_list)) {
890 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
891 plh_bulk_destroy);
892 dprintk("%s freeing layout for inode %lu\n", __func__,
893 lo->plh_inode->i_ino);
894 inode = lo->plh_inode;
895
896 pnfs_layoutcommit_inode(inode, false);
897
898 spin_lock(&inode->i_lock);
899 list_del_init(&lo->plh_bulk_destroy);
900 if (mode == PNFS_LAYOUT_FILE_BULK_RETURN) {
901 pnfs_mark_layout_stateid_return(lo, &lseg_list,
902 IOMODE_ANY, 0);
903 } else if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
904 if (mode == PNFS_LAYOUT_BULK_RETURN)
905 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
906 ret = -EAGAIN;
907 }
908 spin_unlock(&inode->i_lock);
909 pnfs_free_lseg_list(&lseg_list);
910 /* Free all lsegs that are attached to commit buckets */
911 nfs_commit_inode(inode, 0);
912 pnfs_put_layout_hdr(lo);
913 nfs_iput_and_deactive(inode);
914 }
915 return ret;
916}
917
918int pnfs_layout_destroy_byfsid(struct nfs_client *clp, struct nfs_fsid *fsid,
919 enum pnfs_layout_destroy_mode mode)
920{
921 struct nfs_server *server;
922 LIST_HEAD(layout_list);
923
924 spin_lock(&clp->cl_lock);
925 rcu_read_lock();
926restart:
927 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
928 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
929 continue;
930 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
931 server,
932 &layout_list) != 0)
933 goto restart;
934 }
935 rcu_read_unlock();
936 spin_unlock(&clp->cl_lock);
937
938 return pnfs_layout_free_bulk_destroy_list(&layout_list, mode);
939}
940
941static void pnfs_layout_build_destroy_list_byclient(struct nfs_client *clp,
942 struct list_head *list)
943{
944 struct nfs_server *server;
945
946 spin_lock(&clp->cl_lock);
947 rcu_read_lock();
948restart:
949 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
950 if (pnfs_layout_bulk_destroy_byserver_locked(clp, server,
951 list) != 0)
952 goto restart;
953 }
954 rcu_read_unlock();
955 spin_unlock(&clp->cl_lock);
956}
957
958static int pnfs_layout_do_destroy_byclid(struct nfs_client *clp,
959 struct list_head *list,
960 enum pnfs_layout_destroy_mode mode)
961{
962 pnfs_layout_build_destroy_list_byclient(clp, list);
963 return pnfs_layout_free_bulk_destroy_list(list, mode);
964}
965
966int pnfs_layout_destroy_byclid(struct nfs_client *clp,
967 enum pnfs_layout_destroy_mode mode)
968{
969 LIST_HEAD(layout_list);
970
971 return pnfs_layout_do_destroy_byclid(clp, &layout_list, mode);
972}
973
974/*
975 * Called by the state manager to remove all layouts established under an
976 * expired lease.
977 */
978void
979pnfs_destroy_all_layouts(struct nfs_client *clp)
980{
981 nfs4_deviceid_mark_client_invalid(clp);
982 nfs4_deviceid_purge_client(clp);
983
984 pnfs_layout_destroy_byclid(clp, PNFS_LAYOUT_INVALIDATE);
985}
986
987static void pnfs_layout_build_recover_list_byclient(struct nfs_client *clp,
988 struct list_head *list)
989{
990 struct nfs_server *server;
991
992 spin_lock(&clp->cl_lock);
993 rcu_read_lock();
994restart:
995 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
996 if (!(server->caps & NFS_CAP_REBOOT_LAYOUTRETURN))
997 continue;
998 if (pnfs_layout_bulk_destroy_byserver_locked(clp, server,
999 list) != 0)
1000 goto restart;
1001 }
1002 rcu_read_unlock();
1003 spin_unlock(&clp->cl_lock);
1004}
1005
1006static int pnfs_layout_bulk_list_reboot(struct list_head *list)
1007{
1008 struct pnfs_layout_hdr *lo;
1009 struct nfs_server *server;
1010 int ret;
1011
1012 list_for_each_entry(lo, list, plh_bulk_destroy) {
1013 server = NFS_SERVER(lo->plh_inode);
1014 ret = pnfs_layout_return_on_reboot(lo);
1015 switch (ret) {
1016 case 0:
1017 continue;
1018 case -NFS4ERR_BAD_STATEID:
1019 server->caps &= ~NFS_CAP_REBOOT_LAYOUTRETURN;
1020 break;
1021 case -NFS4ERR_NO_GRACE:
1022 break;
1023 default:
1024 goto err;
1025 }
1026 break;
1027 }
1028 return 0;
1029err:
1030 return ret;
1031}
1032
1033int pnfs_layout_handle_reboot(struct nfs_client *clp)
1034{
1035 LIST_HEAD(list);
1036 int ret = 0, ret2;
1037
1038 pnfs_layout_build_recover_list_byclient(clp, &list);
1039 if (!list_empty(&list))
1040 ret = pnfs_layout_bulk_list_reboot(&list);
1041 ret2 = pnfs_layout_do_destroy_byclid(clp, &list,
1042 PNFS_LAYOUT_INVALIDATE);
1043 if (!ret)
1044 ret = ret2;
1045 return (ret == 0) ? 0 : -EAGAIN;
1046}
1047
1048static void
1049pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred)
1050{
1051 const struct cred *old;
1052
1053 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) {
1054 old = xchg(&lo->plh_lc_cred, get_cred(cred));
1055 put_cred(old);
1056 }
1057}
1058
1059/* update lo->plh_stateid with new if is more recent */
1060void
1061pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
1062 const struct cred *cred, bool update_barrier)
1063{
1064 u32 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
1065 u32 newseq = be32_to_cpu(new->seqid);
1066
1067 if (!pnfs_layout_is_valid(lo)) {
1068 pnfs_set_layout_cred(lo, cred);
1069 nfs4_stateid_copy(&lo->plh_stateid, new);
1070 lo->plh_barrier = newseq;
1071 pnfs_clear_layoutreturn_info(lo);
1072 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1073 return;
1074 }
1075
1076 if (pnfs_seqid_is_newer(newseq, oldseq))
1077 nfs4_stateid_copy(&lo->plh_stateid, new);
1078
1079 if (update_barrier) {
1080 pnfs_barrier_update(lo, newseq);
1081 return;
1082 }
1083 /*
1084 * Because of wraparound, we want to keep the barrier
1085 * "close" to the current seqids. We really only want to
1086 * get here from a layoutget call.
1087 */
1088 if (atomic_read(&lo->plh_outstanding) == 1)
1089 pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid));
1090}
1091
1092static bool
1093pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
1094 const nfs4_stateid *stateid)
1095{
1096 u32 seqid = be32_to_cpu(stateid->seqid);
1097
1098 return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid);
1099}
1100
1101/* lget is set to 1 if called from inside send_layoutget call chain */
1102static bool
1103pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
1104{
1105 return lo->plh_block_lgets ||
1106 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
1107}
1108
1109static struct nfs_server *
1110pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx)
1111{
1112 struct nfs_server *server;
1113
1114 if (inode) {
1115 server = NFS_SERVER(inode);
1116 } else {
1117 struct dentry *parent_dir = dget_parent(ctx->dentry);
1118 server = NFS_SERVER(parent_dir->d_inode);
1119 dput(parent_dir);
1120 }
1121 return server;
1122}
1123
1124static void nfs4_free_pages(struct page **pages, size_t size)
1125{
1126 int i;
1127
1128 if (!pages)
1129 return;
1130
1131 for (i = 0; i < size; i++) {
1132 if (!pages[i])
1133 break;
1134 __free_page(pages[i]);
1135 }
1136 kfree(pages);
1137}
1138
1139static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
1140{
1141 struct page **pages;
1142 int i;
1143
1144 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags);
1145 if (!pages) {
1146 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
1147 return NULL;
1148 }
1149
1150 for (i = 0; i < size; i++) {
1151 pages[i] = alloc_page(gfp_flags);
1152 if (!pages[i]) {
1153 dprintk("%s: failed to allocate page\n", __func__);
1154 nfs4_free_pages(pages, i);
1155 return NULL;
1156 }
1157 }
1158
1159 return pages;
1160}
1161
1162static struct nfs4_layoutget *
1163pnfs_alloc_init_layoutget_args(struct inode *ino,
1164 struct nfs_open_context *ctx,
1165 const nfs4_stateid *stateid,
1166 const struct pnfs_layout_range *range,
1167 gfp_t gfp_flags)
1168{
1169 struct nfs_server *server = pnfs_find_server(ino, ctx);
1170 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response;
1171 size_t max_pages = max_response_pages(server);
1172 struct nfs4_layoutget *lgp;
1173
1174 dprintk("--> %s\n", __func__);
1175
1176 lgp = kzalloc(sizeof(*lgp), gfp_flags);
1177 if (lgp == NULL)
1178 return NULL;
1179
1180 if (max_reply_sz) {
1181 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT;
1182 if (npages < max_pages)
1183 max_pages = npages;
1184 }
1185
1186 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
1187 if (!lgp->args.layout.pages) {
1188 kfree(lgp);
1189 return NULL;
1190 }
1191 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
1192 lgp->res.layoutp = &lgp->args.layout;
1193
1194 /* Don't confuse uninitialised result and success */
1195 lgp->res.status = -NFS4ERR_DELAY;
1196
1197 lgp->args.minlength = PAGE_SIZE;
1198 if (lgp->args.minlength > range->length)
1199 lgp->args.minlength = range->length;
1200 if (ino) {
1201 loff_t i_size = i_size_read(ino);
1202
1203 if (range->iomode == IOMODE_READ) {
1204 if (range->offset >= i_size)
1205 lgp->args.minlength = 0;
1206 else if (i_size - range->offset < lgp->args.minlength)
1207 lgp->args.minlength = i_size - range->offset;
1208 }
1209 }
1210 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
1211 pnfs_copy_range(&lgp->args.range, range);
1212 lgp->args.type = server->pnfs_curr_ld->id;
1213 lgp->args.inode = ino;
1214 lgp->args.ctx = get_nfs_open_context(ctx);
1215 nfs4_stateid_copy(&lgp->args.stateid, stateid);
1216 lgp->gfp_flags = gfp_flags;
1217 lgp->cred = ctx->cred;
1218 return lgp;
1219}
1220
1221void pnfs_layoutget_free(struct nfs4_layoutget *lgp)
1222{
1223 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE;
1224
1225 nfs4_free_pages(lgp->args.layout.pages, max_pages);
1226 pnfs_put_layout_hdr(lgp->lo);
1227 put_nfs_open_context(lgp->args.ctx);
1228 kfree(lgp);
1229}
1230
1231static void pnfs_clear_layoutcommit(struct inode *inode,
1232 struct list_head *head)
1233{
1234 struct nfs_inode *nfsi = NFS_I(inode);
1235 struct pnfs_layout_segment *lseg, *tmp;
1236
1237 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1238 return;
1239 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
1240 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1241 continue;
1242 pnfs_lseg_dec_and_remove_zero(lseg, head);
1243 }
1244}
1245
1246static void
1247pnfs_layoutreturn_retry_later_locked(struct pnfs_layout_hdr *lo,
1248 const nfs4_stateid *arg_stateid,
1249 const struct pnfs_layout_range *range)
1250{
1251 const struct pnfs_layout_segment *lseg;
1252 u32 seq = be32_to_cpu(arg_stateid->seqid);
1253
1254 if (pnfs_layout_is_valid(lo) &&
1255 nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) {
1256 list_for_each_entry(lseg, &lo->plh_return_segs, pls_list) {
1257 if (pnfs_seqid_is_newer(lseg->pls_seq, seq) ||
1258 !pnfs_should_free_range(&lseg->pls_range, range))
1259 continue;
1260 pnfs_set_plh_return_info(lo, range->iomode, seq);
1261 break;
1262 }
1263 }
1264}
1265
1266void pnfs_layoutreturn_retry_later(struct pnfs_layout_hdr *lo,
1267 const nfs4_stateid *arg_stateid,
1268 const struct pnfs_layout_range *range)
1269{
1270 struct inode *inode = lo->plh_inode;
1271
1272 spin_lock(&inode->i_lock);
1273 pnfs_layoutreturn_retry_later_locked(lo, arg_stateid, range);
1274 pnfs_clear_layoutreturn_waitbit(lo);
1275 spin_unlock(&inode->i_lock);
1276}
1277
1278void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1279 const nfs4_stateid *arg_stateid,
1280 const struct pnfs_layout_range *range,
1281 const nfs4_stateid *stateid)
1282{
1283 struct inode *inode = lo->plh_inode;
1284 LIST_HEAD(freeme);
1285
1286 spin_lock(&inode->i_lock);
1287 if (!nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1288 goto out_unlock;
1289 if (stateid && pnfs_layout_is_valid(lo)) {
1290 u32 seq = be32_to_cpu(arg_stateid->seqid);
1291
1292 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1293 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1294 pnfs_set_layout_stateid(lo, stateid, NULL, true);
1295 } else
1296 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1297out_unlock:
1298 pnfs_clear_layoutreturn_waitbit(lo);
1299 spin_unlock(&inode->i_lock);
1300 pnfs_free_lseg_list(&freeme);
1301
1302}
1303
1304static bool
1305pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1306 nfs4_stateid *stateid,
1307 const struct cred **cred,
1308 enum pnfs_iomode *iomode)
1309{
1310 /* Serialise LAYOUTGET/LAYOUTRETURN */
1311 if (atomic_read(&lo->plh_outstanding) != 0)
1312 return false;
1313 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1314 return false;
1315 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1316 pnfs_get_layout_hdr(lo);
1317 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1318 *cred = get_cred(lo->plh_lc_cred);
1319 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1320 if (lo->plh_return_seq != 0)
1321 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1322 if (iomode != NULL)
1323 *iomode = lo->plh_return_iomode;
1324 pnfs_clear_layoutreturn_info(lo);
1325 } else if (iomode != NULL)
1326 *iomode = IOMODE_ANY;
1327 pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid));
1328 return true;
1329}
1330
1331static void
1332pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1333 struct pnfs_layout_hdr *lo,
1334 const nfs4_stateid *stateid,
1335 enum pnfs_iomode iomode)
1336{
1337 struct inode *inode = lo->plh_inode;
1338
1339 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1340 args->inode = inode;
1341 args->range.iomode = iomode;
1342 args->range.offset = 0;
1343 args->range.length = NFS4_MAX_UINT64;
1344 args->layout = lo;
1345 nfs4_stateid_copy(&args->stateid, stateid);
1346}
1347
1348static int
1349pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo,
1350 const nfs4_stateid *stateid,
1351 const struct cred **pcred,
1352 enum pnfs_iomode iomode,
1353 unsigned int flags)
1354{
1355 struct inode *ino = lo->plh_inode;
1356 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1357 struct nfs4_layoutreturn *lrp;
1358 const struct cred *cred = *pcred;
1359 int status = 0;
1360
1361 *pcred = NULL;
1362 lrp = kzalloc(sizeof(*lrp), nfs_io_gfp_mask());
1363 if (unlikely(lrp == NULL)) {
1364 status = -ENOMEM;
1365 spin_lock(&ino->i_lock);
1366 pnfs_clear_layoutreturn_waitbit(lo);
1367 spin_unlock(&ino->i_lock);
1368 put_cred(cred);
1369 pnfs_put_layout_hdr(lo);
1370 goto out;
1371 }
1372
1373 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1374 lrp->args.ld_private = &lrp->ld_private;
1375 lrp->clp = NFS_SERVER(ino)->nfs_client;
1376 lrp->cred = cred;
1377 if (ld->prepare_layoutreturn)
1378 ld->prepare_layoutreturn(&lrp->args);
1379
1380 status = nfs4_proc_layoutreturn(lrp, flags);
1381out:
1382 dprintk("<-- %s status: %d\n", __func__, status);
1383 return status;
1384}
1385
1386/* Return true if layoutreturn is needed */
1387static bool
1388pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1389{
1390 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1391 return false;
1392 return pnfs_mark_layout_stateid_return(lo, &lo->plh_return_segs,
1393 lo->plh_return_iomode,
1394 lo->plh_return_seq) != EBUSY;
1395}
1396
1397static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1398{
1399 struct inode *inode= lo->plh_inode;
1400
1401 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1402 return;
1403 spin_lock(&inode->i_lock);
1404 if (pnfs_layout_need_return(lo)) {
1405 const struct cred *cred;
1406 nfs4_stateid stateid;
1407 enum pnfs_iomode iomode;
1408 bool send;
1409
1410 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
1411 spin_unlock(&inode->i_lock);
1412 if (send) {
1413 /* Send an async layoutreturn so we dont deadlock */
1414 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode,
1415 PNFS_FL_LAYOUTRETURN_ASYNC);
1416 }
1417 } else
1418 spin_unlock(&inode->i_lock);
1419}
1420
1421/*
1422 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1423 * when the layout segment list is empty.
1424 *
1425 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1426 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1427 * deviceid is marked invalid.
1428 */
1429int
1430_pnfs_return_layout(struct inode *ino)
1431{
1432 struct pnfs_layout_hdr *lo = NULL;
1433 struct nfs_inode *nfsi = NFS_I(ino);
1434 struct pnfs_layout_range range = {
1435 .iomode = IOMODE_ANY,
1436 .offset = 0,
1437 .length = NFS4_MAX_UINT64,
1438 };
1439 LIST_HEAD(tmp_list);
1440 const struct cred *cred;
1441 nfs4_stateid stateid;
1442 int status = 0;
1443 bool send, valid_layout;
1444
1445 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1446
1447 spin_lock(&ino->i_lock);
1448 lo = nfsi->layout;
1449 if (!lo) {
1450 spin_unlock(&ino->i_lock);
1451 dprintk("NFS: %s no layout to return\n", __func__);
1452 goto out;
1453 }
1454 /* Reference matched in nfs4_layoutreturn_release */
1455 pnfs_get_layout_hdr(lo);
1456 /* Is there an outstanding layoutreturn ? */
1457 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1458 spin_unlock(&ino->i_lock);
1459 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1460 TASK_UNINTERRUPTIBLE))
1461 goto out_put_layout_hdr;
1462 spin_lock(&ino->i_lock);
1463 }
1464 valid_layout = pnfs_layout_is_valid(lo);
1465 pnfs_clear_layoutcommit(ino, &tmp_list);
1466 pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0);
1467
1468 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range)
1469 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1470
1471 /* Don't send a LAYOUTRETURN if list was initially empty */
1472 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) ||
1473 !valid_layout) {
1474 spin_unlock(&ino->i_lock);
1475 dprintk("NFS: %s no layout segments to return\n", __func__);
1476 goto out_wait_layoutreturn;
1477 }
1478
1479 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
1480 spin_unlock(&ino->i_lock);
1481 if (send)
1482 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY,
1483 0);
1484out_wait_layoutreturn:
1485 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
1486out_put_layout_hdr:
1487 pnfs_free_lseg_list(&tmp_list);
1488 pnfs_put_layout_hdr(lo);
1489out:
1490 dprintk("<-- %s status: %d\n", __func__, status);
1491 return status;
1492}
1493
1494int
1495pnfs_commit_and_return_layout(struct inode *inode)
1496{
1497 struct pnfs_layout_hdr *lo;
1498 int ret;
1499
1500 spin_lock(&inode->i_lock);
1501 lo = NFS_I(inode)->layout;
1502 if (lo == NULL) {
1503 spin_unlock(&inode->i_lock);
1504 return 0;
1505 }
1506 pnfs_get_layout_hdr(lo);
1507 /* Block new layoutgets and read/write to ds */
1508 lo->plh_block_lgets++;
1509 spin_unlock(&inode->i_lock);
1510 filemap_fdatawait(inode->i_mapping);
1511 ret = pnfs_layoutcommit_inode(inode, true);
1512 if (ret == 0)
1513 ret = _pnfs_return_layout(inode);
1514 spin_lock(&inode->i_lock);
1515 lo->plh_block_lgets--;
1516 spin_unlock(&inode->i_lock);
1517 pnfs_put_layout_hdr(lo);
1518 return ret;
1519}
1520
1521static int pnfs_layout_return_on_reboot(struct pnfs_layout_hdr *lo)
1522{
1523 struct inode *inode = lo->plh_inode;
1524 const struct cred *cred;
1525
1526 spin_lock(&inode->i_lock);
1527 if (!pnfs_layout_is_valid(lo)) {
1528 spin_unlock(&inode->i_lock);
1529 return 0;
1530 }
1531 cred = get_cred(lo->plh_lc_cred);
1532 pnfs_get_layout_hdr(lo);
1533 spin_unlock(&inode->i_lock);
1534
1535 return pnfs_send_layoutreturn(lo, &zero_stateid, &cred, IOMODE_ANY,
1536 PNFS_FL_LAYOUTRETURN_PRIVILEGED);
1537}
1538
1539bool pnfs_roc(struct inode *ino,
1540 struct nfs4_layoutreturn_args *args,
1541 struct nfs4_layoutreturn_res *res,
1542 const struct cred *cred)
1543{
1544 struct nfs_inode *nfsi = NFS_I(ino);
1545 struct nfs_open_context *ctx;
1546 struct nfs4_state *state;
1547 struct pnfs_layout_hdr *lo;
1548 struct pnfs_layout_segment *lseg, *next;
1549 const struct cred *lc_cred;
1550 nfs4_stateid stateid;
1551 enum pnfs_iomode iomode = 0;
1552 bool layoutreturn = false, roc = false;
1553 bool skip_read = false;
1554
1555 if (!nfs_have_layout(ino))
1556 return false;
1557retry:
1558 rcu_read_lock();
1559 spin_lock(&ino->i_lock);
1560 lo = nfsi->layout;
1561 if (!lo || !pnfs_layout_is_valid(lo) ||
1562 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1563 lo = NULL;
1564 goto out_noroc;
1565 }
1566 pnfs_get_layout_hdr(lo);
1567 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1568 spin_unlock(&ino->i_lock);
1569 rcu_read_unlock();
1570 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1571 TASK_UNINTERRUPTIBLE);
1572 pnfs_put_layout_hdr(lo);
1573 goto retry;
1574 }
1575
1576 /* no roc if we hold a delegation */
1577 if (nfs4_check_delegation(ino, FMODE_READ)) {
1578 if (nfs4_check_delegation(ino, FMODE_WRITE))
1579 goto out_noroc;
1580 skip_read = true;
1581 }
1582
1583 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
1584 state = ctx->state;
1585 if (state == NULL)
1586 continue;
1587 /* Don't return layout if there is open file state */
1588 if (state->state & FMODE_WRITE)
1589 goto out_noroc;
1590 if (state->state & FMODE_READ)
1591 skip_read = true;
1592 }
1593
1594
1595 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1596 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1597 continue;
1598 /* If we are sending layoutreturn, invalidate all valid lsegs */
1599 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1600 continue;
1601 /*
1602 * Note: mark lseg for return so pnfs_layout_remove_lseg
1603 * doesn't invalidate the layout for us.
1604 */
1605 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1606 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1607 continue;
1608 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1609 }
1610
1611 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1612 goto out_noroc;
1613
1614 /* ROC in two conditions:
1615 * 1. there are ROC lsegs
1616 * 2. we don't send layoutreturn
1617 */
1618 /* lo ref dropped in pnfs_roc_release() */
1619 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode);
1620 /* If the creds don't match, we can't compound the layoutreturn */
1621 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
1622 goto out_noroc;
1623
1624 roc = layoutreturn;
1625 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1626 res->lrs_present = 0;
1627 layoutreturn = false;
1628 put_cred(lc_cred);
1629
1630out_noroc:
1631 spin_unlock(&ino->i_lock);
1632 rcu_read_unlock();
1633 pnfs_layoutcommit_inode(ino, true);
1634 if (roc) {
1635 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1636 if (ld->prepare_layoutreturn)
1637 ld->prepare_layoutreturn(args);
1638 pnfs_put_layout_hdr(lo);
1639 return true;
1640 }
1641 if (layoutreturn)
1642 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, 0);
1643 pnfs_put_layout_hdr(lo);
1644 return false;
1645}
1646
1647int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
1648 struct nfs4_layoutreturn_res **respp, int *ret)
1649{
1650 struct nfs4_layoutreturn_args *arg = *argpp;
1651 int retval = -EAGAIN;
1652
1653 if (!arg)
1654 return 0;
1655 /* Handle Layoutreturn errors */
1656 switch (*ret) {
1657 case 0:
1658 retval = 0;
1659 break;
1660 case -NFS4ERR_NOMATCHING_LAYOUT:
1661 /* Was there an RPC level error? If not, retry */
1662 if (task->tk_rpc_status == 0)
1663 break;
1664 /* If the call was not sent, let caller handle it */
1665 if (!RPC_WAS_SENT(task))
1666 return 0;
1667 /*
1668 * Otherwise, assume the call succeeded and
1669 * that we need to release the layout
1670 */
1671 *ret = 0;
1672 (*respp)->lrs_present = 0;
1673 retval = 0;
1674 break;
1675 case -NFS4ERR_DELAY:
1676 /* Let the caller handle the retry */
1677 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1678 return 0;
1679 case -NFS4ERR_OLD_STATEID:
1680 if (!nfs4_layout_refresh_old_stateid(&arg->stateid,
1681 &arg->range, arg->inode))
1682 break;
1683 *ret = -NFS4ERR_NOMATCHING_LAYOUT;
1684 return -EAGAIN;
1685 }
1686 *argpp = NULL;
1687 *respp = NULL;
1688 return retval;
1689}
1690
1691void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1692 struct nfs4_layoutreturn_res *res, int ret)
1693{
1694 struct pnfs_layout_hdr *lo = args->layout;
1695 struct inode *inode = args->inode;
1696 const nfs4_stateid *res_stateid = NULL;
1697 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1698
1699 switch (ret) {
1700 case -NFS4ERR_BADSESSION:
1701 case -NFS4ERR_DEADSESSION:
1702 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1703 case -NFS4ERR_NOMATCHING_LAYOUT:
1704 spin_lock(&inode->i_lock);
1705 pnfs_layoutreturn_retry_later_locked(lo, &args->stateid,
1706 &args->range);
1707 pnfs_clear_layoutreturn_waitbit(lo);
1708 spin_unlock(&inode->i_lock);
1709 break;
1710 case 0:
1711 if (res->lrs_present)
1712 res_stateid = &res->stateid;
1713 fallthrough;
1714 default:
1715 pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range,
1716 res_stateid);
1717 }
1718 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret);
1719 if (ld_private && ld_private->ops && ld_private->ops->free)
1720 ld_private->ops->free(ld_private);
1721 pnfs_put_layout_hdr(lo);
1722}
1723
1724bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1725{
1726 struct nfs_inode *nfsi = NFS_I(ino);
1727 struct pnfs_layout_hdr *lo;
1728 bool sleep = false;
1729
1730 /* we might not have grabbed lo reference. so need to check under
1731 * i_lock */
1732 spin_lock(&ino->i_lock);
1733 lo = nfsi->layout;
1734 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1735 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1736 sleep = true;
1737 }
1738 spin_unlock(&ino->i_lock);
1739 return sleep;
1740}
1741
1742/*
1743 * Compare two layout segments for sorting into layout cache.
1744 * We want to preferentially return RW over RO layouts, so ensure those
1745 * are seen first.
1746 */
1747static s64
1748pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1749 const struct pnfs_layout_range *l2)
1750{
1751 s64 d;
1752
1753 /* high offset > low offset */
1754 d = l1->offset - l2->offset;
1755 if (d)
1756 return d;
1757
1758 /* short length > long length */
1759 d = l2->length - l1->length;
1760 if (d)
1761 return d;
1762
1763 /* read > read/write */
1764 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1765}
1766
1767static bool
1768pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1769 const struct pnfs_layout_range *l2)
1770{
1771 return pnfs_lseg_range_cmp(l1, l2) > 0;
1772}
1773
1774static bool
1775pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1776 struct pnfs_layout_segment *old)
1777{
1778 return false;
1779}
1780
1781void
1782pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1783 struct pnfs_layout_segment *lseg,
1784 bool (*is_after)(const struct pnfs_layout_range *,
1785 const struct pnfs_layout_range *),
1786 bool (*do_merge)(struct pnfs_layout_segment *,
1787 struct pnfs_layout_segment *),
1788 struct list_head *free_me)
1789{
1790 struct pnfs_layout_segment *lp, *tmp;
1791
1792 dprintk("%s:Begin\n", __func__);
1793
1794 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1795 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1796 continue;
1797 if (do_merge(lseg, lp)) {
1798 mark_lseg_invalid(lp, free_me);
1799 continue;
1800 }
1801 if (is_after(&lseg->pls_range, &lp->pls_range))
1802 continue;
1803 list_add_tail(&lseg->pls_list, &lp->pls_list);
1804 dprintk("%s: inserted lseg %p "
1805 "iomode %d offset %llu length %llu before "
1806 "lp %p iomode %d offset %llu length %llu\n",
1807 __func__, lseg, lseg->pls_range.iomode,
1808 lseg->pls_range.offset, lseg->pls_range.length,
1809 lp, lp->pls_range.iomode, lp->pls_range.offset,
1810 lp->pls_range.length);
1811 goto out;
1812 }
1813 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1814 dprintk("%s: inserted lseg %p "
1815 "iomode %d offset %llu length %llu at tail\n",
1816 __func__, lseg, lseg->pls_range.iomode,
1817 lseg->pls_range.offset, lseg->pls_range.length);
1818out:
1819 pnfs_get_layout_hdr(lo);
1820
1821 dprintk("%s:Return\n", __func__);
1822}
1823EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1824
1825static void
1826pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1827 struct pnfs_layout_segment *lseg,
1828 struct list_head *free_me)
1829{
1830 struct inode *inode = lo->plh_inode;
1831 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1832
1833 if (ld->add_lseg != NULL)
1834 ld->add_lseg(lo, lseg, free_me);
1835 else
1836 pnfs_generic_layout_insert_lseg(lo, lseg,
1837 pnfs_lseg_range_is_after,
1838 pnfs_lseg_no_merge,
1839 free_me);
1840}
1841
1842static struct pnfs_layout_hdr *
1843alloc_init_layout_hdr(struct inode *ino,
1844 struct nfs_open_context *ctx,
1845 gfp_t gfp_flags)
1846{
1847 struct pnfs_layout_hdr *lo;
1848
1849 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1850 if (!lo)
1851 return NULL;
1852 refcount_set(&lo->plh_refcount, 1);
1853 INIT_LIST_HEAD(&lo->plh_layouts);
1854 INIT_LIST_HEAD(&lo->plh_segs);
1855 INIT_LIST_HEAD(&lo->plh_return_segs);
1856 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1857 lo->plh_inode = ino;
1858 lo->plh_lc_cred = get_cred(ctx->cred);
1859 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1860 return lo;
1861}
1862
1863static struct pnfs_layout_hdr *
1864pnfs_find_alloc_layout(struct inode *ino,
1865 struct nfs_open_context *ctx,
1866 gfp_t gfp_flags)
1867 __releases(&ino->i_lock)
1868 __acquires(&ino->i_lock)
1869{
1870 struct nfs_inode *nfsi = NFS_I(ino);
1871 struct pnfs_layout_hdr *new = NULL;
1872
1873 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1874
1875 if (nfsi->layout != NULL)
1876 goto out_existing;
1877 spin_unlock(&ino->i_lock);
1878 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1879 spin_lock(&ino->i_lock);
1880
1881 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1882 nfsi->layout = new;
1883 return new;
1884 } else if (new != NULL)
1885 pnfs_free_layout_hdr(new);
1886out_existing:
1887 pnfs_get_layout_hdr(nfsi->layout);
1888 return nfsi->layout;
1889}
1890
1891/*
1892 * iomode matching rules:
1893 * iomode lseg strict match
1894 * iomode
1895 * ----- ----- ------ -----
1896 * ANY READ N/A true
1897 * ANY RW N/A true
1898 * RW READ N/A false
1899 * RW RW N/A true
1900 * READ READ N/A true
1901 * READ RW true false
1902 * READ RW false true
1903 */
1904static bool
1905pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1906 const struct pnfs_layout_range *range,
1907 bool strict_iomode)
1908{
1909 struct pnfs_layout_range range1;
1910
1911 if ((range->iomode == IOMODE_RW &&
1912 ls_range->iomode != IOMODE_RW) ||
1913 (range->iomode != ls_range->iomode &&
1914 strict_iomode) ||
1915 !pnfs_lseg_range_intersecting(ls_range, range))
1916 return false;
1917
1918 /* range1 covers only the first byte in the range */
1919 range1 = *range;
1920 range1.length = 1;
1921 return pnfs_lseg_range_contained(ls_range, &range1);
1922}
1923
1924/*
1925 * lookup range in layout
1926 */
1927static struct pnfs_layout_segment *
1928pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1929 struct pnfs_layout_range *range,
1930 bool strict_iomode)
1931{
1932 struct pnfs_layout_segment *lseg, *ret = NULL;
1933
1934 dprintk("%s:Begin\n", __func__);
1935
1936 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1937 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1938 pnfs_lseg_range_match(&lseg->pls_range, range,
1939 strict_iomode)) {
1940 ret = pnfs_get_lseg(lseg);
1941 break;
1942 }
1943 }
1944
1945 dprintk("%s:Return lseg %p ref %d\n",
1946 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0);
1947 return ret;
1948}
1949
1950/*
1951 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1952 * to the MDS or over pNFS
1953 *
1954 * The nfs_inode read_io and write_io fields are cumulative counters reset
1955 * when there are no layout segments. Note that in pnfs_update_layout iomode
1956 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1957 * WRITE request.
1958 *
1959 * A return of true means use MDS I/O.
1960 *
1961 * From rfc 5661:
1962 * If a file's size is smaller than the file size threshold, data accesses
1963 * SHOULD be sent to the metadata server. If an I/O request has a length that
1964 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1965 * server. If both file size and I/O size are provided, the client SHOULD
1966 * reach or exceed both thresholds before sending its read or write
1967 * requests to the data server.
1968 */
1969static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1970 struct inode *ino, int iomode)
1971{
1972 struct nfs4_threshold *t = ctx->mdsthreshold;
1973 struct nfs_inode *nfsi = NFS_I(ino);
1974 loff_t fsize = i_size_read(ino);
1975 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1976
1977 if (t == NULL)
1978 return ret;
1979
1980 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1981 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1982
1983 switch (iomode) {
1984 case IOMODE_READ:
1985 if (t->bm & THRESHOLD_RD) {
1986 dprintk("%s fsize %llu\n", __func__, fsize);
1987 size_set = true;
1988 if (fsize < t->rd_sz)
1989 size = true;
1990 }
1991 if (t->bm & THRESHOLD_RD_IO) {
1992 dprintk("%s nfsi->read_io %llu\n", __func__,
1993 nfsi->read_io);
1994 io_set = true;
1995 if (nfsi->read_io < t->rd_io_sz)
1996 io = true;
1997 }
1998 break;
1999 case IOMODE_RW:
2000 if (t->bm & THRESHOLD_WR) {
2001 dprintk("%s fsize %llu\n", __func__, fsize);
2002 size_set = true;
2003 if (fsize < t->wr_sz)
2004 size = true;
2005 }
2006 if (t->bm & THRESHOLD_WR_IO) {
2007 dprintk("%s nfsi->write_io %llu\n", __func__,
2008 nfsi->write_io);
2009 io_set = true;
2010 if (nfsi->write_io < t->wr_io_sz)
2011 io = true;
2012 }
2013 break;
2014 }
2015 if (size_set && io_set) {
2016 if (size && io)
2017 ret = true;
2018 } else if (size || io)
2019 ret = true;
2020
2021 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
2022 return ret;
2023}
2024
2025static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
2026{
2027 /*
2028 * send layoutcommit as it can hold up layoutreturn due to lseg
2029 * reference
2030 */
2031 pnfs_layoutcommit_inode(lo->plh_inode, false);
2032 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
2033 nfs_wait_bit_killable,
2034 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
2035}
2036
2037static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
2038{
2039 atomic_inc(&lo->plh_outstanding);
2040}
2041
2042static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
2043{
2044 if (atomic_dec_and_test(&lo->plh_outstanding) &&
2045 test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags))
2046 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN);
2047}
2048
2049static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo)
2050{
2051 return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags);
2052}
2053
2054static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
2055{
2056 unsigned long *bitlock = &lo->plh_flags;
2057
2058 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
2059 smp_mb__after_atomic();
2060 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
2061}
2062
2063static void _add_to_server_list(struct pnfs_layout_hdr *lo,
2064 struct nfs_server *server)
2065{
2066 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
2067 struct nfs_client *clp = server->nfs_client;
2068
2069 /* The lo must be on the clp list if there is any
2070 * chance of a CB_LAYOUTRECALL(FILE) coming in.
2071 */
2072 spin_lock(&clp->cl_lock);
2073 list_add_tail_rcu(&lo->plh_layouts, &server->layouts);
2074 spin_unlock(&clp->cl_lock);
2075 }
2076}
2077
2078/*
2079 * Layout segment is retreived from the server if not cached.
2080 * The appropriate layout segment is referenced and returned to the caller.
2081 */
2082struct pnfs_layout_segment *
2083pnfs_update_layout(struct inode *ino,
2084 struct nfs_open_context *ctx,
2085 loff_t pos,
2086 u64 count,
2087 enum pnfs_iomode iomode,
2088 bool strict_iomode,
2089 gfp_t gfp_flags)
2090{
2091 struct pnfs_layout_range arg = {
2092 .iomode = iomode,
2093 .offset = pos,
2094 .length = count,
2095 };
2096 unsigned pg_offset;
2097 struct nfs_server *server = NFS_SERVER(ino);
2098 struct nfs_client *clp = server->nfs_client;
2099 struct pnfs_layout_hdr *lo = NULL;
2100 struct pnfs_layout_segment *lseg = NULL;
2101 struct nfs4_layoutget *lgp;
2102 nfs4_stateid stateid;
2103 struct nfs4_exception exception = {
2104 .inode = ino,
2105 };
2106 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
2107 bool first;
2108
2109 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
2110 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2111 PNFS_UPDATE_LAYOUT_NO_PNFS);
2112 goto out;
2113 }
2114
2115 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
2116 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2117 PNFS_UPDATE_LAYOUT_MDSTHRESH);
2118 goto out;
2119 }
2120
2121lookup_again:
2122 if (!nfs4_valid_open_stateid(ctx->state)) {
2123 trace_pnfs_update_layout(ino, pos, count,
2124 iomode, lo, lseg,
2125 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2126 lseg = ERR_PTR(-EIO);
2127 goto out;
2128 }
2129
2130 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp));
2131 if (IS_ERR(lseg))
2132 goto out;
2133 first = false;
2134 spin_lock(&ino->i_lock);
2135 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
2136 if (lo == NULL) {
2137 spin_unlock(&ino->i_lock);
2138 lseg = ERR_PTR(-ENOMEM);
2139 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2140 PNFS_UPDATE_LAYOUT_NOMEM);
2141 goto out;
2142 }
2143
2144 /* Do we even need to bother with this? */
2145 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
2146 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2147 PNFS_UPDATE_LAYOUT_BULK_RECALL);
2148 dprintk("%s matches recall, use MDS\n", __func__);
2149 goto out_unlock;
2150 }
2151
2152 /* if LAYOUTGET already failed once we don't try again */
2153 if (pnfs_layout_io_test_failed(lo, iomode)) {
2154 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2155 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
2156 goto out_unlock;
2157 }
2158
2159 /*
2160 * If the layout segment list is empty, but there are outstanding
2161 * layoutget calls, then they might be subject to a layoutrecall.
2162 */
2163 if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) &&
2164 atomic_read(&lo->plh_outstanding) != 0) {
2165 spin_unlock(&ino->i_lock);
2166 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN,
2167 TASK_KILLABLE));
2168 if (IS_ERR(lseg))
2169 goto out_put_layout_hdr;
2170 pnfs_put_layout_hdr(lo);
2171 goto lookup_again;
2172 }
2173
2174 /*
2175 * Because we free lsegs when sending LAYOUTRETURN, we need to wait
2176 * for LAYOUTRETURN.
2177 */
2178 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
2179 spin_unlock(&ino->i_lock);
2180 dprintk("%s wait for layoutreturn\n", __func__);
2181 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo));
2182 if (!IS_ERR(lseg)) {
2183 pnfs_put_layout_hdr(lo);
2184 dprintk("%s retrying\n", __func__);
2185 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
2186 lseg,
2187 PNFS_UPDATE_LAYOUT_RETRY);
2188 goto lookup_again;
2189 }
2190 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2191 PNFS_UPDATE_LAYOUT_RETURN);
2192 goto out_put_layout_hdr;
2193 }
2194
2195 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
2196 if (lseg) {
2197 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2198 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
2199 goto out_unlock;
2200 }
2201
2202 /*
2203 * Choose a stateid for the LAYOUTGET. If we don't have a layout
2204 * stateid, or it has been invalidated, then we must use the open
2205 * stateid.
2206 */
2207 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
2208 int status;
2209
2210 /*
2211 * The first layoutget for the file. Need to serialize per
2212 * RFC 5661 Errata 3208.
2213 */
2214 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
2215 &lo->plh_flags)) {
2216 spin_unlock(&ino->i_lock);
2217 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags,
2218 NFS_LAYOUT_FIRST_LAYOUTGET,
2219 TASK_KILLABLE));
2220 if (IS_ERR(lseg))
2221 goto out_put_layout_hdr;
2222 pnfs_put_layout_hdr(lo);
2223 dprintk("%s retrying\n", __func__);
2224 goto lookup_again;
2225 }
2226
2227 spin_unlock(&ino->i_lock);
2228 first = true;
2229 status = nfs4_select_rw_stateid(ctx->state,
2230 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
2231 NULL, &stateid, NULL);
2232 if (status != 0) {
2233 lseg = ERR_PTR(status);
2234 trace_pnfs_update_layout(ino, pos, count,
2235 iomode, lo, lseg,
2236 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
2237 nfs4_schedule_stateid_recovery(server, ctx->state);
2238 pnfs_clear_first_layoutget(lo);
2239 pnfs_put_layout_hdr(lo);
2240 goto lookup_again;
2241 }
2242 spin_lock(&ino->i_lock);
2243 } else {
2244 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
2245 }
2246
2247 if (pnfs_layoutgets_blocked(lo)) {
2248 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2249 PNFS_UPDATE_LAYOUT_BLOCKED);
2250 goto out_unlock;
2251 }
2252 nfs_layoutget_begin(lo);
2253 spin_unlock(&ino->i_lock);
2254
2255 _add_to_server_list(lo, server);
2256
2257 pg_offset = arg.offset & ~PAGE_MASK;
2258 if (pg_offset) {
2259 arg.offset -= pg_offset;
2260 arg.length += pg_offset;
2261 }
2262 if (arg.length != NFS4_MAX_UINT64)
2263 arg.length = PAGE_ALIGN(arg.length);
2264
2265 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags);
2266 if (!lgp) {
2267 lseg = ERR_PTR(-ENOMEM);
2268 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
2269 PNFS_UPDATE_LAYOUT_NOMEM);
2270 nfs_layoutget_end(lo);
2271 goto out_put_layout_hdr;
2272 }
2273
2274 lgp->lo = lo;
2275 pnfs_get_layout_hdr(lo);
2276
2277 lseg = nfs4_proc_layoutget(lgp, &exception);
2278 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2279 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
2280 nfs_layoutget_end(lo);
2281 if (IS_ERR(lseg)) {
2282 switch(PTR_ERR(lseg)) {
2283 case -EBUSY:
2284 if (time_after(jiffies, giveup))
2285 lseg = NULL;
2286 break;
2287 case -ERECALLCONFLICT:
2288 case -EAGAIN:
2289 break;
2290 case -ENODATA:
2291 /* The server returned NFS4ERR_LAYOUTUNAVAILABLE */
2292 pnfs_layout_set_fail_bit(
2293 lo, pnfs_iomode_to_fail_bit(iomode));
2294 lseg = NULL;
2295 goto out_put_layout_hdr;
2296 default:
2297 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
2298 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2299 lseg = NULL;
2300 }
2301 goto out_put_layout_hdr;
2302 }
2303 if (lseg) {
2304 if (!exception.retry)
2305 goto out_put_layout_hdr;
2306 if (first)
2307 pnfs_clear_first_layoutget(lo);
2308 trace_pnfs_update_layout(ino, pos, count,
2309 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
2310 pnfs_put_layout_hdr(lo);
2311 goto lookup_again;
2312 }
2313 } else {
2314 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2315 }
2316
2317out_put_layout_hdr:
2318 if (first)
2319 pnfs_clear_first_layoutget(lo);
2320 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
2321 PNFS_UPDATE_LAYOUT_EXIT);
2322 pnfs_put_layout_hdr(lo);
2323out:
2324 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
2325 "(%s, offset: %llu, length: %llu)\n",
2326 __func__, ino->i_sb->s_id,
2327 (unsigned long long)NFS_FILEID(ino),
2328 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
2329 iomode==IOMODE_RW ? "read/write" : "read-only",
2330 (unsigned long long)pos,
2331 (unsigned long long)count);
2332 return lseg;
2333out_unlock:
2334 spin_unlock(&ino->i_lock);
2335 goto out_put_layout_hdr;
2336}
2337EXPORT_SYMBOL_GPL(pnfs_update_layout);
2338
2339static bool
2340pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
2341{
2342 switch (range->iomode) {
2343 case IOMODE_READ:
2344 case IOMODE_RW:
2345 break;
2346 default:
2347 return false;
2348 }
2349 if (range->offset == NFS4_MAX_UINT64)
2350 return false;
2351 if (range->length == 0)
2352 return false;
2353 if (range->length != NFS4_MAX_UINT64 &&
2354 range->length > NFS4_MAX_UINT64 - range->offset)
2355 return false;
2356 return true;
2357}
2358
2359static struct pnfs_layout_hdr *
2360_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx)
2361{
2362 struct pnfs_layout_hdr *lo;
2363
2364 spin_lock(&ino->i_lock);
2365 lo = pnfs_find_alloc_layout(ino, ctx, nfs_io_gfp_mask());
2366 if (!lo)
2367 goto out_unlock;
2368 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
2369 goto out_unlock;
2370 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
2371 goto out_unlock;
2372 if (pnfs_layoutgets_blocked(lo))
2373 goto out_unlock;
2374 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags))
2375 goto out_unlock;
2376 nfs_layoutget_begin(lo);
2377 spin_unlock(&ino->i_lock);
2378 _add_to_server_list(lo, NFS_SERVER(ino));
2379 return lo;
2380
2381out_unlock:
2382 spin_unlock(&ino->i_lock);
2383 pnfs_put_layout_hdr(lo);
2384 return NULL;
2385}
2386
2387static void _lgopen_prepare_attached(struct nfs4_opendata *data,
2388 struct nfs_open_context *ctx)
2389{
2390 struct inode *ino = data->dentry->d_inode;
2391 struct pnfs_layout_range rng = {
2392 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2393 IOMODE_RW: IOMODE_READ,
2394 .offset = 0,
2395 .length = NFS4_MAX_UINT64,
2396 };
2397 struct nfs4_layoutget *lgp;
2398 struct pnfs_layout_hdr *lo;
2399
2400 /* Heuristic: don't send layoutget if we have cached data */
2401 if (rng.iomode == IOMODE_READ &&
2402 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0))
2403 return;
2404
2405 lo = _pnfs_grab_empty_layout(ino, ctx);
2406 if (!lo)
2407 return;
2408 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &current_stateid, &rng,
2409 nfs_io_gfp_mask());
2410 if (!lgp) {
2411 pnfs_clear_first_layoutget(lo);
2412 nfs_layoutget_end(lo);
2413 pnfs_put_layout_hdr(lo);
2414 return;
2415 }
2416 lgp->lo = lo;
2417 data->lgp = lgp;
2418 data->o_arg.lg_args = &lgp->args;
2419 data->o_res.lg_res = &lgp->res;
2420}
2421
2422static void _lgopen_prepare_floating(struct nfs4_opendata *data,
2423 struct nfs_open_context *ctx)
2424{
2425 struct inode *ino = data->dentry->d_inode;
2426 struct pnfs_layout_range rng = {
2427 .iomode = (data->o_arg.fmode & FMODE_WRITE) ?
2428 IOMODE_RW: IOMODE_READ,
2429 .offset = 0,
2430 .length = NFS4_MAX_UINT64,
2431 };
2432 struct nfs4_layoutget *lgp;
2433
2434 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &current_stateid, &rng,
2435 nfs_io_gfp_mask());
2436 if (!lgp)
2437 return;
2438 data->lgp = lgp;
2439 data->o_arg.lg_args = &lgp->args;
2440 data->o_res.lg_res = &lgp->res;
2441}
2442
2443void pnfs_lgopen_prepare(struct nfs4_opendata *data,
2444 struct nfs_open_context *ctx)
2445{
2446 struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
2447
2448 if (!(pnfs_enabled_sb(server) &&
2449 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN))
2450 return;
2451 /* Could check on max_ops, but currently hardcoded high enough */
2452 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN))
2453 return;
2454 if (data->lgp)
2455 return;
2456 if (data->state)
2457 _lgopen_prepare_attached(data, ctx);
2458 else
2459 _lgopen_prepare_floating(data, ctx);
2460}
2461
2462void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
2463 struct nfs_open_context *ctx)
2464{
2465 struct pnfs_layout_hdr *lo;
2466 struct pnfs_layout_segment *lseg;
2467 struct nfs_server *srv = NFS_SERVER(ino);
2468 u32 iomode;
2469
2470 if (!lgp)
2471 return;
2472 dprintk("%s: entered with status %i\n", __func__, lgp->res.status);
2473 if (lgp->res.status) {
2474 switch (lgp->res.status) {
2475 default:
2476 break;
2477 /*
2478 * Halt lgopen attempts if the server doesn't recognise
2479 * the "current stateid" value, the layout type, or the
2480 * layoutget operation as being valid.
2481 * Also if it complains about too many ops in the compound
2482 * or of the request/reply being too big.
2483 */
2484 case -NFS4ERR_BAD_STATEID:
2485 case -NFS4ERR_NOTSUPP:
2486 case -NFS4ERR_REP_TOO_BIG:
2487 case -NFS4ERR_REP_TOO_BIG_TO_CACHE:
2488 case -NFS4ERR_REQ_TOO_BIG:
2489 case -NFS4ERR_TOO_MANY_OPS:
2490 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
2491 srv->caps &= ~NFS_CAP_LGOPEN;
2492 }
2493 return;
2494 }
2495 if (!lgp->lo) {
2496 lo = _pnfs_grab_empty_layout(ino, ctx);
2497 if (!lo)
2498 return;
2499 lgp->lo = lo;
2500 } else
2501 lo = lgp->lo;
2502
2503 lseg = pnfs_layout_process(lgp);
2504 if (!IS_ERR(lseg)) {
2505 iomode = lgp->args.range.iomode;
2506 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
2507 pnfs_put_lseg(lseg);
2508 }
2509}
2510
2511void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
2512{
2513 if (lgp != NULL) {
2514 if (lgp->lo) {
2515 pnfs_clear_first_layoutget(lgp->lo);
2516 nfs_layoutget_end(lgp->lo);
2517 }
2518 pnfs_layoutget_free(lgp);
2519 }
2520}
2521
2522struct pnfs_layout_segment *
2523pnfs_layout_process(struct nfs4_layoutget *lgp)
2524{
2525 struct pnfs_layout_hdr *lo = lgp->lo;
2526 struct nfs4_layoutget_res *res = &lgp->res;
2527 struct pnfs_layout_segment *lseg;
2528 struct inode *ino = lo->plh_inode;
2529 LIST_HEAD(free_me);
2530
2531 if (!pnfs_sanity_check_layout_range(&res->range))
2532 return ERR_PTR(-EINVAL);
2533
2534 /* Inject layout blob into I/O device driver */
2535 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
2536 if (IS_ERR_OR_NULL(lseg)) {
2537 if (!lseg)
2538 lseg = ERR_PTR(-ENOMEM);
2539
2540 dprintk("%s: Could not allocate layout: error %ld\n",
2541 __func__, PTR_ERR(lseg));
2542 return lseg;
2543 }
2544
2545 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
2546
2547 spin_lock(&ino->i_lock);
2548 if (pnfs_layoutgets_blocked(lo)) {
2549 dprintk("%s forget reply due to state\n", __func__);
2550 goto out_forget;
2551 }
2552
2553 if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) &&
2554 !pnfs_is_first_layoutget(lo))
2555 goto out_forget;
2556
2557 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
2558 /* existing state ID, make sure the sequence number matches. */
2559 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
2560 if (!pnfs_layout_is_valid(lo))
2561 lo->plh_barrier = 0;
2562 dprintk("%s forget reply due to sequence\n", __func__);
2563 goto out_forget;
2564 }
2565 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false);
2566 } else if (pnfs_layout_is_valid(lo)) {
2567 /*
2568 * We got an entirely new state ID. Mark all segments for the
2569 * inode invalid, and retry the layoutget
2570 */
2571 struct pnfs_layout_range range = {
2572 .iomode = IOMODE_ANY,
2573 .length = NFS4_MAX_UINT64,
2574 };
2575 pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0);
2576 goto out_forget;
2577 } else {
2578 /* We have a completely new layout */
2579 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
2580 }
2581
2582 pnfs_get_lseg(lseg);
2583 pnfs_layout_insert_lseg(lo, lseg, &free_me);
2584
2585
2586 if (res->return_on_close)
2587 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
2588
2589 spin_unlock(&ino->i_lock);
2590 pnfs_free_lseg_list(&free_me);
2591 return lseg;
2592
2593out_forget:
2594 spin_unlock(&ino->i_lock);
2595 lseg->pls_layout = lo;
2596 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
2597 return ERR_PTR(-EAGAIN);
2598}
2599
2600/**
2601 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
2602 * @lo: pointer to layout header
2603 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2604 * @return_range: describe layout segment ranges to be returned
2605 * @seq: stateid seqid to match
2606 *
2607 * This function is mainly intended for use by layoutrecall. It attempts
2608 * to free the layout segment immediately, or else to mark it for return
2609 * as soon as its reference count drops to zero.
2610 *
2611 * Returns
2612 * - 0: a layoutreturn needs to be scheduled.
2613 * - EBUSY: there are layout segment that are still in use.
2614 * - ENOENT: there are no layout segments that need to be returned.
2615 */
2616int
2617pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2618 struct list_head *tmp_list,
2619 const struct pnfs_layout_range *return_range,
2620 u32 seq)
2621{
2622 struct pnfs_layout_segment *lseg, *next;
2623 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
2624 int remaining = 0;
2625
2626 dprintk("%s:Begin lo %p\n", __func__, lo);
2627
2628 assert_spin_locked(&lo->plh_inode->i_lock);
2629
2630 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2631 tmp_list = &lo->plh_return_segs;
2632
2633 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2634 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2635 dprintk("%s: marking lseg %p iomode %d "
2636 "offset %llu length %llu\n", __func__,
2637 lseg, lseg->pls_range.iomode,
2638 lseg->pls_range.offset,
2639 lseg->pls_range.length);
2640 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2641 tmp_list = &lo->plh_return_segs;
2642 if (mark_lseg_invalid(lseg, tmp_list))
2643 continue;
2644 remaining++;
2645 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2646 pnfs_lseg_cancel_io(server, lseg);
2647 }
2648
2649 if (remaining) {
2650 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2651 return -EBUSY;
2652 }
2653
2654 if (!list_empty(&lo->plh_return_segs)) {
2655 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2656 return 0;
2657 }
2658
2659 return -ENOENT;
2660}
2661
2662static void
2663pnfs_mark_layout_for_return(struct inode *inode,
2664 const struct pnfs_layout_range *range)
2665{
2666 struct pnfs_layout_hdr *lo;
2667 bool return_now = false;
2668
2669 spin_lock(&inode->i_lock);
2670 lo = NFS_I(inode)->layout;
2671 if (!pnfs_layout_is_valid(lo)) {
2672 spin_unlock(&inode->i_lock);
2673 return;
2674 }
2675 pnfs_set_plh_return_info(lo, range->iomode, 0);
2676 /*
2677 * mark all matching lsegs so that we are sure to have no live
2678 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2679 * for how it works.
2680 */
2681 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) {
2682 const struct cred *cred;
2683 nfs4_stateid stateid;
2684 enum pnfs_iomode iomode;
2685
2686 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
2687 spin_unlock(&inode->i_lock);
2688 if (return_now)
2689 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode,
2690 PNFS_FL_LAYOUTRETURN_ASYNC);
2691 } else {
2692 spin_unlock(&inode->i_lock);
2693 nfs_commit_inode(inode, 0);
2694 }
2695}
2696
2697void pnfs_error_mark_layout_for_return(struct inode *inode,
2698 struct pnfs_layout_segment *lseg)
2699{
2700 struct pnfs_layout_range range = {
2701 .iomode = lseg->pls_range.iomode,
2702 .offset = 0,
2703 .length = NFS4_MAX_UINT64,
2704 };
2705
2706 pnfs_mark_layout_for_return(inode, &range);
2707}
2708EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2709
2710static bool
2711pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo)
2712{
2713 return pnfs_layout_is_valid(lo) &&
2714 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) &&
2715 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
2716}
2717
2718static struct pnfs_layout_segment *
2719pnfs_find_first_lseg(struct pnfs_layout_hdr *lo,
2720 const struct pnfs_layout_range *range,
2721 enum pnfs_iomode iomode)
2722{
2723 struct pnfs_layout_segment *lseg;
2724
2725 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
2726 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
2727 continue;
2728 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
2729 continue;
2730 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY)
2731 continue;
2732 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range))
2733 return lseg;
2734 }
2735 return NULL;
2736}
2737
2738/* Find open file states whose mode matches that of the range */
2739static bool
2740pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo,
2741 const struct pnfs_layout_range *range)
2742{
2743 struct list_head *head;
2744 struct nfs_open_context *ctx;
2745 fmode_t mode = 0;
2746
2747 if (!pnfs_layout_can_be_returned(lo) ||
2748 !pnfs_find_first_lseg(lo, range, range->iomode))
2749 return false;
2750
2751 head = &NFS_I(lo->plh_inode)->open_files;
2752 list_for_each_entry_rcu(ctx, head, list) {
2753 if (ctx->state)
2754 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE);
2755 }
2756
2757 switch (range->iomode) {
2758 default:
2759 break;
2760 case IOMODE_READ:
2761 mode &= ~FMODE_WRITE;
2762 break;
2763 case IOMODE_RW:
2764 if (pnfs_find_first_lseg(lo, range, IOMODE_READ))
2765 mode &= ~FMODE_READ;
2766 }
2767 return mode == 0;
2768}
2769
2770static int pnfs_layout_return_unused_byserver(struct nfs_server *server,
2771 void *data)
2772{
2773 const struct pnfs_layout_range *range = data;
2774 const struct cred *cred;
2775 struct pnfs_layout_hdr *lo;
2776 struct inode *inode;
2777 nfs4_stateid stateid;
2778 enum pnfs_iomode iomode;
2779
2780restart:
2781 rcu_read_lock();
2782 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
2783 inode = lo->plh_inode;
2784 if (!inode || !pnfs_layout_can_be_returned(lo) ||
2785 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
2786 continue;
2787 spin_lock(&inode->i_lock);
2788 if (!lo->plh_inode ||
2789 !pnfs_should_return_unused_layout(lo, range)) {
2790 spin_unlock(&inode->i_lock);
2791 continue;
2792 }
2793 pnfs_get_layout_hdr(lo);
2794 pnfs_set_plh_return_info(lo, range->iomode, 0);
2795 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
2796 range, 0) != 0 ||
2797 !pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode)) {
2798 spin_unlock(&inode->i_lock);
2799 rcu_read_unlock();
2800 pnfs_put_layout_hdr(lo);
2801 cond_resched();
2802 goto restart;
2803 }
2804 spin_unlock(&inode->i_lock);
2805 rcu_read_unlock();
2806 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode,
2807 PNFS_FL_LAYOUTRETURN_ASYNC);
2808 pnfs_put_layout_hdr(lo);
2809 cond_resched();
2810 goto restart;
2811 }
2812 rcu_read_unlock();
2813 return 0;
2814}
2815
2816void
2817pnfs_layout_return_unused_byclid(struct nfs_client *clp,
2818 enum pnfs_iomode iomode)
2819{
2820 struct pnfs_layout_range range = {
2821 .iomode = iomode,
2822 .offset = 0,
2823 .length = NFS4_MAX_UINT64,
2824 };
2825
2826 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver,
2827 &range);
2828}
2829
2830/* Check if we have we have a valid layout but if there isn't an intersection
2831 * between the request and the pgio->pg_lseg, put this pgio->pg_lseg away.
2832 */
2833void
2834pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio,
2835 struct nfs_page *req)
2836{
2837 if (pgio->pg_lseg == NULL ||
2838 (test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags) &&
2839 pnfs_lseg_request_intersecting(pgio->pg_lseg, req)))
2840 return;
2841 pnfs_put_lseg(pgio->pg_lseg);
2842 pgio->pg_lseg = NULL;
2843}
2844EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
2845
2846void
2847pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2848{
2849 u64 rd_size;
2850
2851 pnfs_generic_pg_check_layout(pgio, req);
2852 if (pgio->pg_lseg == NULL) {
2853 if (pgio->pg_dreq == NULL)
2854 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2855 else
2856 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq,
2857 req_offset(req));
2858
2859 pgio->pg_lseg =
2860 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
2861 req_offset(req), rd_size,
2862 IOMODE_READ, false,
2863 nfs_io_gfp_mask());
2864 if (IS_ERR(pgio->pg_lseg)) {
2865 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2866 pgio->pg_lseg = NULL;
2867 return;
2868 }
2869 }
2870 /* If no lseg, fall back to read through mds */
2871 if (pgio->pg_lseg == NULL)
2872 nfs_pageio_reset_read_mds(pgio);
2873
2874}
2875EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2876
2877void
2878pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2879 struct nfs_page *req, u64 wb_size)
2880{
2881 pnfs_generic_pg_check_layout(pgio, req);
2882 if (pgio->pg_lseg == NULL) {
2883 pgio->pg_lseg =
2884 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req),
2885 req_offset(req), wb_size, IOMODE_RW,
2886 false, nfs_io_gfp_mask());
2887 if (IS_ERR(pgio->pg_lseg)) {
2888 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2889 pgio->pg_lseg = NULL;
2890 return;
2891 }
2892 }
2893 /* If no lseg, fall back to write through mds */
2894 if (pgio->pg_lseg == NULL)
2895 nfs_pageio_reset_write_mds(pgio);
2896}
2897EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2898
2899void
2900pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2901{
2902 if (desc->pg_lseg) {
2903 pnfs_put_lseg(desc->pg_lseg);
2904 desc->pg_lseg = NULL;
2905 }
2906}
2907EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2908
2909/*
2910 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2911 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2912 */
2913size_t
2914pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2915 struct nfs_page *prev, struct nfs_page *req)
2916{
2917 unsigned int size;
2918 u64 seg_end, req_start, seg_left;
2919
2920 size = nfs_generic_pg_test(pgio, prev, req);
2921 if (!size)
2922 return 0;
2923
2924 /*
2925 * 'size' contains the number of bytes left in the current page (up
2926 * to the original size asked for in @req->wb_bytes).
2927 *
2928 * Calculate how many bytes are left in the layout segment
2929 * and if there are less bytes than 'size', return that instead.
2930 *
2931 * Please also note that 'end_offset' is actually the offset of the
2932 * first byte that lies outside the pnfs_layout_range. FIXME?
2933 *
2934 */
2935 if (pgio->pg_lseg) {
2936 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2937 pgio->pg_lseg->pls_range.length);
2938 req_start = req_offset(req);
2939
2940 /* start of request is past the last byte of this segment */
2941 if (req_start >= seg_end)
2942 return 0;
2943
2944 /* adjust 'size' iff there are fewer bytes left in the
2945 * segment than what nfs_generic_pg_test returned */
2946 seg_left = seg_end - req_start;
2947 if (seg_left < size)
2948 size = (unsigned int)seg_left;
2949 }
2950
2951 return size;
2952}
2953EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2954
2955int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2956{
2957 struct nfs_pageio_descriptor pgio;
2958
2959 /* Resend all requests through the MDS */
2960 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2961 hdr->completion_ops);
2962 return nfs_pageio_resend(&pgio, hdr);
2963}
2964EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2965
2966static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2967{
2968
2969 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2970 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2971 PNFS_LAYOUTRET_ON_ERROR) {
2972 pnfs_return_layout(hdr->inode);
2973 }
2974 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2975 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2976}
2977
2978/*
2979 * Called by non rpc-based layout drivers
2980 */
2981void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2982{
2983 if (likely(!hdr->pnfs_error)) {
2984 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2985 hdr->mds_offset + hdr->res.count);
2986 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2987 }
2988 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2989 if (unlikely(hdr->pnfs_error))
2990 pnfs_ld_handle_write_error(hdr);
2991 hdr->mds_ops->rpc_release(hdr);
2992}
2993EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2994
2995static void
2996pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2997 struct nfs_pgio_header *hdr)
2998{
2999 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
3000
3001 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3002 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
3003 nfs_pageio_reset_write_mds(desc);
3004 mirror->pg_recoalesce = 1;
3005 }
3006 hdr->completion_ops->completion(hdr);
3007}
3008
3009static enum pnfs_try_status
3010pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
3011 const struct rpc_call_ops *call_ops,
3012 struct pnfs_layout_segment *lseg,
3013 int how)
3014{
3015 struct inode *inode = hdr->inode;
3016 enum pnfs_try_status trypnfs;
3017 struct nfs_server *nfss = NFS_SERVER(inode);
3018
3019 hdr->mds_ops = call_ops;
3020
3021 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
3022 inode->i_ino, hdr->args.count, hdr->args.offset, how);
3023 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
3024 if (trypnfs != PNFS_NOT_ATTEMPTED)
3025 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
3026 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
3027 return trypnfs;
3028}
3029
3030static void
3031pnfs_do_write(struct nfs_pageio_descriptor *desc,
3032 struct nfs_pgio_header *hdr, int how)
3033{
3034 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
3035 struct pnfs_layout_segment *lseg = desc->pg_lseg;
3036 enum pnfs_try_status trypnfs;
3037
3038 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
3039 switch (trypnfs) {
3040 case PNFS_NOT_ATTEMPTED:
3041 pnfs_write_through_mds(desc, hdr);
3042 break;
3043 case PNFS_ATTEMPTED:
3044 break;
3045 case PNFS_TRY_AGAIN:
3046 /* cleanup hdr and prepare to redo pnfs */
3047 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3048 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
3049 list_splice_init(&hdr->pages, &mirror->pg_list);
3050 mirror->pg_recoalesce = 1;
3051 }
3052 hdr->mds_ops->rpc_release(hdr);
3053 }
3054}
3055
3056static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
3057{
3058 pnfs_put_lseg(hdr->lseg);
3059 nfs_pgio_header_free(hdr);
3060}
3061
3062int
3063pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
3064{
3065 struct nfs_pgio_header *hdr;
3066 int ret;
3067
3068 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
3069 if (!hdr) {
3070 desc->pg_error = -ENOMEM;
3071 return desc->pg_error;
3072 }
3073 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
3074
3075 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
3076 ret = nfs_generic_pgio(desc, hdr);
3077 if (!ret)
3078 pnfs_do_write(desc, hdr, desc->pg_ioflags);
3079
3080 return ret;
3081}
3082EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
3083
3084int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
3085{
3086 struct nfs_pageio_descriptor pgio;
3087
3088 /* Resend all requests through the MDS */
3089 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
3090 return nfs_pageio_resend(&pgio, hdr);
3091}
3092EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
3093
3094static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
3095{
3096 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
3097 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
3098 PNFS_LAYOUTRET_ON_ERROR) {
3099 pnfs_return_layout(hdr->inode);
3100 }
3101 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
3102 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
3103}
3104
3105/*
3106 * Called by non rpc-based layout drivers
3107 */
3108void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
3109{
3110 if (likely(!hdr->pnfs_error))
3111 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
3112 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
3113 if (unlikely(hdr->pnfs_error))
3114 pnfs_ld_handle_read_error(hdr);
3115 hdr->mds_ops->rpc_release(hdr);
3116}
3117EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
3118
3119static void
3120pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
3121 struct nfs_pgio_header *hdr)
3122{
3123 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
3124
3125 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3126 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
3127 nfs_pageio_reset_read_mds(desc);
3128 mirror->pg_recoalesce = 1;
3129 }
3130 hdr->completion_ops->completion(hdr);
3131}
3132
3133/*
3134 * Call the appropriate parallel I/O subsystem read function.
3135 */
3136static enum pnfs_try_status
3137pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
3138 const struct rpc_call_ops *call_ops,
3139 struct pnfs_layout_segment *lseg)
3140{
3141 struct inode *inode = hdr->inode;
3142 struct nfs_server *nfss = NFS_SERVER(inode);
3143 enum pnfs_try_status trypnfs;
3144
3145 hdr->mds_ops = call_ops;
3146
3147 dprintk("%s: Reading ino:%lu %u@%llu\n",
3148 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
3149
3150 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
3151 if (trypnfs != PNFS_NOT_ATTEMPTED)
3152 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
3153 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
3154 return trypnfs;
3155}
3156
3157/* Resend all requests through pnfs. */
3158void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr,
3159 unsigned int mirror_idx)
3160{
3161 struct nfs_pageio_descriptor pgio;
3162
3163 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3164 /* Prevent deadlocks with layoutreturn! */
3165 pnfs_put_lseg(hdr->lseg);
3166 hdr->lseg = NULL;
3167
3168 nfs_pageio_init_read(&pgio, hdr->inode, false,
3169 hdr->completion_ops);
3170 pgio.pg_mirror_idx = mirror_idx;
3171 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
3172 }
3173}
3174EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
3175
3176static void
3177pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
3178{
3179 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
3180 struct pnfs_layout_segment *lseg = desc->pg_lseg;
3181 enum pnfs_try_status trypnfs;
3182
3183 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
3184 switch (trypnfs) {
3185 case PNFS_NOT_ATTEMPTED:
3186 pnfs_read_through_mds(desc, hdr);
3187 break;
3188 case PNFS_ATTEMPTED:
3189 break;
3190 case PNFS_TRY_AGAIN:
3191 /* cleanup hdr and prepare to redo pnfs */
3192 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
3193 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
3194 list_splice_init(&hdr->pages, &mirror->pg_list);
3195 mirror->pg_recoalesce = 1;
3196 }
3197 hdr->mds_ops->rpc_release(hdr);
3198 }
3199}
3200
3201static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
3202{
3203 pnfs_put_lseg(hdr->lseg);
3204 nfs_pgio_header_free(hdr);
3205}
3206
3207int
3208pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
3209{
3210 struct nfs_pgio_header *hdr;
3211 int ret;
3212
3213 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
3214 if (!hdr) {
3215 desc->pg_error = -ENOMEM;
3216 return desc->pg_error;
3217 }
3218 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
3219 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
3220 ret = nfs_generic_pgio(desc, hdr);
3221 if (!ret)
3222 pnfs_do_read(desc, hdr);
3223 return ret;
3224}
3225EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
3226
3227static void pnfs_clear_layoutcommitting(struct inode *inode)
3228{
3229 unsigned long *bitlock = &NFS_I(inode)->flags;
3230
3231 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
3232 smp_mb__after_atomic();
3233 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
3234}
3235
3236/*
3237 * There can be multiple RW segments.
3238 */
3239static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
3240{
3241 struct pnfs_layout_segment *lseg;
3242
3243 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
3244 if (lseg->pls_range.iomode == IOMODE_RW &&
3245 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
3246 list_add(&lseg->pls_lc_list, listp);
3247 }
3248}
3249
3250static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
3251{
3252 struct pnfs_layout_segment *lseg, *tmp;
3253
3254 /* Matched by references in pnfs_set_layoutcommit */
3255 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
3256 list_del_init(&lseg->pls_lc_list);
3257 pnfs_put_lseg(lseg);
3258 }
3259
3260 pnfs_clear_layoutcommitting(inode);
3261}
3262
3263void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
3264{
3265 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
3266}
3267EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
3268
3269void
3270pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
3271 loff_t end_pos)
3272{
3273 struct nfs_inode *nfsi = NFS_I(inode);
3274 bool mark_as_dirty = false;
3275
3276 spin_lock(&inode->i_lock);
3277 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
3278 nfsi->layout->plh_lwb = end_pos;
3279 mark_as_dirty = true;
3280 dprintk("%s: Set layoutcommit for inode %lu ",
3281 __func__, inode->i_ino);
3282 } else if (end_pos > nfsi->layout->plh_lwb)
3283 nfsi->layout->plh_lwb = end_pos;
3284 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
3285 /* references matched in nfs4_layoutcommit_release */
3286 pnfs_get_lseg(lseg);
3287 }
3288 spin_unlock(&inode->i_lock);
3289 dprintk("%s: lseg %p end_pos %llu\n",
3290 __func__, lseg, nfsi->layout->plh_lwb);
3291
3292 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
3293 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
3294 if (mark_as_dirty)
3295 mark_inode_dirty_sync(inode);
3296}
3297EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
3298
3299void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
3300{
3301 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
3302
3303 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
3304 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
3305 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
3306}
3307
3308/*
3309 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
3310 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
3311 * data to disk to allow the server to recover the data if it crashes.
3312 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
3313 * is off, and a COMMIT is sent to a data server, or
3314 * if WRITEs to a data server return NFS_DATA_SYNC.
3315 */
3316int
3317pnfs_layoutcommit_inode(struct inode *inode, bool sync)
3318{
3319 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3320 struct nfs4_layoutcommit_data *data;
3321 struct nfs_inode *nfsi = NFS_I(inode);
3322 loff_t end_pos;
3323 int status;
3324
3325 if (!pnfs_layoutcommit_outstanding(inode))
3326 return 0;
3327
3328 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
3329
3330 status = -EAGAIN;
3331 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
3332 if (!sync)
3333 goto out;
3334 status = wait_on_bit_lock_action(&nfsi->flags,
3335 NFS_INO_LAYOUTCOMMITTING,
3336 nfs_wait_bit_killable,
3337 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
3338 if (status)
3339 goto out;
3340 }
3341
3342 status = -ENOMEM;
3343 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
3344 data = kzalloc(sizeof(*data), nfs_io_gfp_mask());
3345 if (!data)
3346 goto clear_layoutcommitting;
3347
3348 status = 0;
3349 spin_lock(&inode->i_lock);
3350 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
3351 goto out_unlock;
3352
3353 INIT_LIST_HEAD(&data->lseg_list);
3354 pnfs_list_write_lseg(inode, &data->lseg_list);
3355
3356 end_pos = nfsi->layout->plh_lwb;
3357
3358 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
3359 data->cred = get_cred(nfsi->layout->plh_lc_cred);
3360 spin_unlock(&inode->i_lock);
3361
3362 data->args.inode = inode;
3363 nfs_fattr_init(&data->fattr);
3364 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3365 data->res.fattr = &data->fattr;
3366 if (end_pos != 0)
3367 data->args.lastbytewritten = end_pos - 1;
3368 else
3369 data->args.lastbytewritten = U64_MAX;
3370 data->res.server = NFS_SERVER(inode);
3371
3372 if (ld->prepare_layoutcommit) {
3373 status = ld->prepare_layoutcommit(&data->args);
3374 if (status) {
3375 put_cred(data->cred);
3376 spin_lock(&inode->i_lock);
3377 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
3378 if (end_pos > nfsi->layout->plh_lwb)
3379 nfsi->layout->plh_lwb = end_pos;
3380 goto out_unlock;
3381 }
3382 }
3383
3384
3385 status = nfs4_proc_layoutcommit(data, sync);
3386out:
3387 if (status)
3388 mark_inode_dirty_sync(inode);
3389 dprintk("<-- %s status %d\n", __func__, status);
3390 return status;
3391out_unlock:
3392 spin_unlock(&inode->i_lock);
3393 kfree(data);
3394clear_layoutcommitting:
3395 pnfs_clear_layoutcommitting(inode);
3396 goto out;
3397}
3398EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
3399
3400int
3401pnfs_generic_sync(struct inode *inode, bool datasync)
3402{
3403 return pnfs_layoutcommit_inode(inode, true);
3404}
3405EXPORT_SYMBOL_GPL(pnfs_generic_sync);
3406
3407struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
3408{
3409 struct nfs4_threshold *thp;
3410
3411 thp = kzalloc(sizeof(*thp), nfs_io_gfp_mask());
3412 if (!thp) {
3413 dprintk("%s mdsthreshold allocation failed\n", __func__);
3414 return NULL;
3415 }
3416 return thp;
3417}
3418
3419#if IS_ENABLED(CONFIG_NFS_V4_2)
3420int
3421pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
3422{
3423 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
3424 struct nfs_server *server = NFS_SERVER(inode);
3425 struct nfs_inode *nfsi = NFS_I(inode);
3426 struct nfs42_layoutstat_data *data;
3427 struct pnfs_layout_hdr *hdr;
3428 int status = 0;
3429
3430 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
3431 goto out;
3432
3433 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
3434 goto out;
3435
3436 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
3437 goto out;
3438
3439 spin_lock(&inode->i_lock);
3440 if (!NFS_I(inode)->layout) {
3441 spin_unlock(&inode->i_lock);
3442 goto out_clear_layoutstats;
3443 }
3444 hdr = NFS_I(inode)->layout;
3445 pnfs_get_layout_hdr(hdr);
3446 spin_unlock(&inode->i_lock);
3447
3448 data = kzalloc(sizeof(*data), gfp_flags);
3449 if (!data) {
3450 status = -ENOMEM;
3451 goto out_put;
3452 }
3453
3454 data->args.fh = NFS_FH(inode);
3455 data->args.inode = inode;
3456 status = ld->prepare_layoutstats(&data->args);
3457 if (status)
3458 goto out_free;
3459
3460 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
3461
3462out:
3463 dprintk("%s returns %d\n", __func__, status);
3464 return status;
3465
3466out_free:
3467 kfree(data);
3468out_put:
3469 pnfs_put_layout_hdr(hdr);
3470out_clear_layoutstats:
3471 smp_mb__before_atomic();
3472 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
3473 smp_mb__after_atomic();
3474 goto out;
3475}
3476EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
3477#endif
3478
3479unsigned int layoutstats_timer;
3480module_param(layoutstats_timer, uint, 0644);
3481EXPORT_SYMBOL_GPL(layoutstats_timer);
Linux 6.x block layer and io_uring tree(s)