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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 "internal.h"
33#include "pnfs.h"
34#include "iostat.h"
35
36#define NFSDBG_FACILITY NFSDBG_PNFS
37
38/* Locking:
39 *
40 * pnfs_spinlock:
41 * protects pnfs_modules_tbl.
42 */
43static DEFINE_SPINLOCK(pnfs_spinlock);
44
45/*
46 * pnfs_modules_tbl holds all pnfs modules
47 */
48static LIST_HEAD(pnfs_modules_tbl);
49
50/* Return the registered pnfs layout driver module matching given id */
51static struct pnfs_layoutdriver_type *
52find_pnfs_driver_locked(u32 id)
53{
54 struct pnfs_layoutdriver_type *local;
55
56 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
57 if (local->id == id)
58 goto out;
59 local = NULL;
60out:
61 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
62 return local;
63}
64
65static struct pnfs_layoutdriver_type *
66find_pnfs_driver(u32 id)
67{
68 struct pnfs_layoutdriver_type *local;
69
70 spin_lock(&pnfs_spinlock);
71 local = find_pnfs_driver_locked(id);
72 spin_unlock(&pnfs_spinlock);
73 return local;
74}
75
76void
77unset_pnfs_layoutdriver(struct nfs_server *nfss)
78{
79 if (nfss->pnfs_curr_ld) {
80 if (nfss->pnfs_curr_ld->clear_layoutdriver)
81 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
82 module_put(nfss->pnfs_curr_ld->owner);
83 }
84 nfss->pnfs_curr_ld = NULL;
85}
86
87/*
88 * Try to set the server's pnfs module to the pnfs layout type specified by id.
89 * Currently only one pNFS layout driver per filesystem is supported.
90 *
91 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
92 */
93void
94set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
95 u32 id)
96{
97 struct pnfs_layoutdriver_type *ld_type = NULL;
98
99 if (id == 0)
100 goto out_no_driver;
101 if (!(server->nfs_client->cl_exchange_flags &
102 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
103 printk(KERN_ERR "%s: id %u cl_exchange_flags 0x%x\n", __func__,
104 id, server->nfs_client->cl_exchange_flags);
105 goto out_no_driver;
106 }
107 ld_type = find_pnfs_driver(id);
108 if (!ld_type) {
109 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
110 ld_type = find_pnfs_driver(id);
111 if (!ld_type) {
112 dprintk("%s: No pNFS module found for %u.\n",
113 __func__, id);
114 goto out_no_driver;
115 }
116 }
117 if (!try_module_get(ld_type->owner)) {
118 dprintk("%s: Could not grab reference on module\n", __func__);
119 goto out_no_driver;
120 }
121 server->pnfs_curr_ld = ld_type;
122 if (ld_type->set_layoutdriver
123 && ld_type->set_layoutdriver(server, mntfh)) {
124 printk(KERN_ERR "%s: Error initializing pNFS layout driver %u.\n",
125 __func__, id);
126 module_put(ld_type->owner);
127 goto out_no_driver;
128 }
129
130 dprintk("%s: pNFS module for %u set\n", __func__, id);
131 return;
132
133out_no_driver:
134 dprintk("%s: Using NFSv4 I/O\n", __func__);
135 server->pnfs_curr_ld = NULL;
136}
137
138int
139pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
140{
141 int status = -EINVAL;
142 struct pnfs_layoutdriver_type *tmp;
143
144 if (ld_type->id == 0) {
145 printk(KERN_ERR "%s id 0 is reserved\n", __func__);
146 return status;
147 }
148 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
149 printk(KERN_ERR "%s Layout driver must provide "
150 "alloc_lseg and free_lseg.\n", __func__);
151 return status;
152 }
153
154 spin_lock(&pnfs_spinlock);
155 tmp = find_pnfs_driver_locked(ld_type->id);
156 if (!tmp) {
157 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
158 status = 0;
159 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
160 ld_type->name);
161 } else {
162 printk(KERN_ERR "%s Module with id %d already loaded!\n",
163 __func__, ld_type->id);
164 }
165 spin_unlock(&pnfs_spinlock);
166
167 return status;
168}
169EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
170
171void
172pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
173{
174 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
175 spin_lock(&pnfs_spinlock);
176 list_del(&ld_type->pnfs_tblid);
177 spin_unlock(&pnfs_spinlock);
178}
179EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
180
181/*
182 * pNFS client layout cache
183 */
184
185/* Need to hold i_lock if caller does not already hold reference */
186void
187get_layout_hdr(struct pnfs_layout_hdr *lo)
188{
189 atomic_inc(&lo->plh_refcount);
190}
191
192static struct pnfs_layout_hdr *
193pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
194{
195 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
196 return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) :
197 kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags);
198}
199
200static void
201pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
202{
203 struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld;
204 put_rpccred(lo->plh_lc_cred);
205 return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo);
206}
207
208static void
209destroy_layout_hdr(struct pnfs_layout_hdr *lo)
210{
211 dprintk("%s: freeing layout cache %p\n", __func__, lo);
212 BUG_ON(!list_empty(&lo->plh_layouts));
213 NFS_I(lo->plh_inode)->layout = NULL;
214 pnfs_free_layout_hdr(lo);
215}
216
217static void
218put_layout_hdr_locked(struct pnfs_layout_hdr *lo)
219{
220 if (atomic_dec_and_test(&lo->plh_refcount))
221 destroy_layout_hdr(lo);
222}
223
224void
225put_layout_hdr(struct pnfs_layout_hdr *lo)
226{
227 struct inode *inode = lo->plh_inode;
228
229 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
230 destroy_layout_hdr(lo);
231 spin_unlock(&inode->i_lock);
232 }
233}
234
235static void
236init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
237{
238 INIT_LIST_HEAD(&lseg->pls_list);
239 INIT_LIST_HEAD(&lseg->pls_lc_list);
240 atomic_set(&lseg->pls_refcount, 1);
241 smp_mb();
242 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
243 lseg->pls_layout = lo;
244}
245
246static void free_lseg(struct pnfs_layout_segment *lseg)
247{
248 struct inode *ino = lseg->pls_layout->plh_inode;
249
250 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
251 /* Matched by get_layout_hdr in pnfs_insert_layout */
252 put_layout_hdr(NFS_I(ino)->layout);
253}
254
255static void
256put_lseg_common(struct pnfs_layout_segment *lseg)
257{
258 struct inode *inode = lseg->pls_layout->plh_inode;
259
260 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
261 list_del_init(&lseg->pls_list);
262 if (list_empty(&lseg->pls_layout->plh_segs)) {
263 set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags);
264 /* Matched by initial refcount set in alloc_init_layout_hdr */
265 put_layout_hdr_locked(lseg->pls_layout);
266 }
267 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
268}
269
270void
271put_lseg(struct pnfs_layout_segment *lseg)
272{
273 struct inode *inode;
274
275 if (!lseg)
276 return;
277
278 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
279 atomic_read(&lseg->pls_refcount),
280 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
281 inode = lseg->pls_layout->plh_inode;
282 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
283 LIST_HEAD(free_me);
284
285 put_lseg_common(lseg);
286 list_add(&lseg->pls_list, &free_me);
287 spin_unlock(&inode->i_lock);
288 pnfs_free_lseg_list(&free_me);
289 }
290}
291EXPORT_SYMBOL_GPL(put_lseg);
292
293static inline u64
294end_offset(u64 start, u64 len)
295{
296 u64 end;
297
298 end = start + len;
299 return end >= start ? end : NFS4_MAX_UINT64;
300}
301
302/* last octet in a range */
303static inline u64
304last_byte_offset(u64 start, u64 len)
305{
306 u64 end;
307
308 BUG_ON(!len);
309 end = start + len;
310 return end > start ? end - 1 : NFS4_MAX_UINT64;
311}
312
313/*
314 * is l2 fully contained in l1?
315 * start1 end1
316 * [----------------------------------)
317 * start2 end2
318 * [----------------)
319 */
320static inline int
321lo_seg_contained(struct pnfs_layout_range *l1,
322 struct pnfs_layout_range *l2)
323{
324 u64 start1 = l1->offset;
325 u64 end1 = end_offset(start1, l1->length);
326 u64 start2 = l2->offset;
327 u64 end2 = end_offset(start2, l2->length);
328
329 return (start1 <= start2) && (end1 >= end2);
330}
331
332/*
333 * is l1 and l2 intersecting?
334 * start1 end1
335 * [----------------------------------)
336 * start2 end2
337 * [----------------)
338 */
339static inline int
340lo_seg_intersecting(struct pnfs_layout_range *l1,
341 struct pnfs_layout_range *l2)
342{
343 u64 start1 = l1->offset;
344 u64 end1 = end_offset(start1, l1->length);
345 u64 start2 = l2->offset;
346 u64 end2 = end_offset(start2, l2->length);
347
348 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
349 (end2 == NFS4_MAX_UINT64 || end2 > start1);
350}
351
352static bool
353should_free_lseg(struct pnfs_layout_range *lseg_range,
354 struct pnfs_layout_range *recall_range)
355{
356 return (recall_range->iomode == IOMODE_ANY ||
357 lseg_range->iomode == recall_range->iomode) &&
358 lo_seg_intersecting(lseg_range, recall_range);
359}
360
361/* Returns 1 if lseg is removed from list, 0 otherwise */
362static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
363 struct list_head *tmp_list)
364{
365 int rv = 0;
366
367 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
368 /* Remove the reference keeping the lseg in the
369 * list. It will now be removed when all
370 * outstanding io is finished.
371 */
372 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
373 atomic_read(&lseg->pls_refcount));
374 if (atomic_dec_and_test(&lseg->pls_refcount)) {
375 put_lseg_common(lseg);
376 list_add(&lseg->pls_list, tmp_list);
377 rv = 1;
378 }
379 }
380 return rv;
381}
382
383/* Returns count of number of matching invalid lsegs remaining in list
384 * after call.
385 */
386int
387mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
388 struct list_head *tmp_list,
389 struct pnfs_layout_range *recall_range)
390{
391 struct pnfs_layout_segment *lseg, *next;
392 int invalid = 0, removed = 0;
393
394 dprintk("%s:Begin lo %p\n", __func__, lo);
395
396 if (list_empty(&lo->plh_segs)) {
397 if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags))
398 put_layout_hdr_locked(lo);
399 return 0;
400 }
401 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
402 if (!recall_range ||
403 should_free_lseg(&lseg->pls_range, recall_range)) {
404 dprintk("%s: freeing lseg %p iomode %d "
405 "offset %llu length %llu\n", __func__,
406 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
407 lseg->pls_range.length);
408 invalid++;
409 removed += mark_lseg_invalid(lseg, tmp_list);
410 }
411 dprintk("%s:Return %i\n", __func__, invalid - removed);
412 return invalid - removed;
413}
414
415/* note free_me must contain lsegs from a single layout_hdr */
416void
417pnfs_free_lseg_list(struct list_head *free_me)
418{
419 struct pnfs_layout_segment *lseg, *tmp;
420 struct pnfs_layout_hdr *lo;
421
422 if (list_empty(free_me))
423 return;
424
425 lo = list_first_entry(free_me, struct pnfs_layout_segment,
426 pls_list)->pls_layout;
427
428 if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) {
429 struct nfs_client *clp;
430
431 clp = NFS_SERVER(lo->plh_inode)->nfs_client;
432 spin_lock(&clp->cl_lock);
433 list_del_init(&lo->plh_layouts);
434 spin_unlock(&clp->cl_lock);
435 }
436 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
437 list_del(&lseg->pls_list);
438 free_lseg(lseg);
439 }
440}
441
442void
443pnfs_destroy_layout(struct nfs_inode *nfsi)
444{
445 struct pnfs_layout_hdr *lo;
446 LIST_HEAD(tmp_list);
447
448 spin_lock(&nfsi->vfs_inode.i_lock);
449 lo = nfsi->layout;
450 if (lo) {
451 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
452 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
453 }
454 spin_unlock(&nfsi->vfs_inode.i_lock);
455 pnfs_free_lseg_list(&tmp_list);
456}
457
458/*
459 * Called by the state manger to remove all layouts established under an
460 * expired lease.
461 */
462void
463pnfs_destroy_all_layouts(struct nfs_client *clp)
464{
465 struct nfs_server *server;
466 struct pnfs_layout_hdr *lo;
467 LIST_HEAD(tmp_list);
468
469 nfs4_deviceid_mark_client_invalid(clp);
470 nfs4_deviceid_purge_client(clp);
471
472 spin_lock(&clp->cl_lock);
473 rcu_read_lock();
474 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
475 if (!list_empty(&server->layouts))
476 list_splice_init(&server->layouts, &tmp_list);
477 }
478 rcu_read_unlock();
479 spin_unlock(&clp->cl_lock);
480
481 while (!list_empty(&tmp_list)) {
482 lo = list_entry(tmp_list.next, struct pnfs_layout_hdr,
483 plh_layouts);
484 dprintk("%s freeing layout for inode %lu\n", __func__,
485 lo->plh_inode->i_ino);
486 list_del_init(&lo->plh_layouts);
487 pnfs_destroy_layout(NFS_I(lo->plh_inode));
488 }
489}
490
491/* update lo->plh_stateid with new if is more recent */
492void
493pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
494 bool update_barrier)
495{
496 u32 oldseq, newseq;
497
498 oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid);
499 newseq = be32_to_cpu(new->stateid.seqid);
500 if ((int)(newseq - oldseq) > 0) {
501 memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid));
502 if (update_barrier) {
503 u32 new_barrier = be32_to_cpu(new->stateid.seqid);
504
505 if ((int)(new_barrier - lo->plh_barrier))
506 lo->plh_barrier = new_barrier;
507 } else {
508 /* Because of wraparound, we want to keep the barrier
509 * "close" to the current seqids. It needs to be
510 * within 2**31 to count as "behind", so if it
511 * gets too near that limit, give us a litle leeway
512 * and bring it to within 2**30.
513 * NOTE - and yes, this is all unsigned arithmetic.
514 */
515 if (unlikely((newseq - lo->plh_barrier) > (3 << 29)))
516 lo->plh_barrier = newseq - (1 << 30);
517 }
518 }
519}
520
521/* lget is set to 1 if called from inside send_layoutget call chain */
522static bool
523pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid,
524 int lget)
525{
526 if ((stateid) &&
527 (int)(lo->plh_barrier - be32_to_cpu(stateid->stateid.seqid)) >= 0)
528 return true;
529 return lo->plh_block_lgets ||
530 test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) ||
531 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
532 (list_empty(&lo->plh_segs) &&
533 (atomic_read(&lo->plh_outstanding) > lget));
534}
535
536int
537pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
538 struct nfs4_state *open_state)
539{
540 int status = 0;
541
542 dprintk("--> %s\n", __func__);
543 spin_lock(&lo->plh_inode->i_lock);
544 if (pnfs_layoutgets_blocked(lo, NULL, 1)) {
545 status = -EAGAIN;
546 } else if (list_empty(&lo->plh_segs)) {
547 int seq;
548
549 do {
550 seq = read_seqbegin(&open_state->seqlock);
551 memcpy(dst->data, open_state->stateid.data,
552 sizeof(open_state->stateid.data));
553 } while (read_seqretry(&open_state->seqlock, seq));
554 } else
555 memcpy(dst->data, lo->plh_stateid.data, sizeof(lo->plh_stateid.data));
556 spin_unlock(&lo->plh_inode->i_lock);
557 dprintk("<-- %s\n", __func__);
558 return status;
559}
560
561/*
562* Get layout from server.
563* for now, assume that whole file layouts are requested.
564* arg->offset: 0
565* arg->length: all ones
566*/
567static struct pnfs_layout_segment *
568send_layoutget(struct pnfs_layout_hdr *lo,
569 struct nfs_open_context *ctx,
570 struct pnfs_layout_range *range,
571 gfp_t gfp_flags)
572{
573 struct inode *ino = lo->plh_inode;
574 struct nfs_server *server = NFS_SERVER(ino);
575 struct nfs4_layoutget *lgp;
576 struct pnfs_layout_segment *lseg = NULL;
577 struct page **pages = NULL;
578 int i;
579 u32 max_resp_sz, max_pages;
580
581 dprintk("--> %s\n", __func__);
582
583 BUG_ON(ctx == NULL);
584 lgp = kzalloc(sizeof(*lgp), gfp_flags);
585 if (lgp == NULL)
586 return NULL;
587
588 /* allocate pages for xdr post processing */
589 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
590 max_pages = max_resp_sz >> PAGE_SHIFT;
591
592 pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags);
593 if (!pages)
594 goto out_err_free;
595
596 for (i = 0; i < max_pages; i++) {
597 pages[i] = alloc_page(gfp_flags);
598 if (!pages[i])
599 goto out_err_free;
600 }
601
602 lgp->args.minlength = PAGE_CACHE_SIZE;
603 if (lgp->args.minlength > range->length)
604 lgp->args.minlength = range->length;
605 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
606 lgp->args.range = *range;
607 lgp->args.type = server->pnfs_curr_ld->id;
608 lgp->args.inode = ino;
609 lgp->args.ctx = get_nfs_open_context(ctx);
610 lgp->args.layout.pages = pages;
611 lgp->args.layout.pglen = max_pages * PAGE_SIZE;
612 lgp->lsegpp = &lseg;
613 lgp->gfp_flags = gfp_flags;
614
615 /* Synchronously retrieve layout information from server and
616 * store in lseg.
617 */
618 nfs4_proc_layoutget(lgp);
619 if (!lseg) {
620 /* remember that LAYOUTGET failed and suspend trying */
621 set_bit(lo_fail_bit(range->iomode), &lo->plh_flags);
622 }
623
624 /* free xdr pages */
625 for (i = 0; i < max_pages; i++)
626 __free_page(pages[i]);
627 kfree(pages);
628
629 return lseg;
630
631out_err_free:
632 /* free any allocated xdr pages, lgp as it's not used */
633 if (pages) {
634 for (i = 0; i < max_pages; i++) {
635 if (!pages[i])
636 break;
637 __free_page(pages[i]);
638 }
639 kfree(pages);
640 }
641 kfree(lgp);
642 return NULL;
643}
644
645/* Initiates a LAYOUTRETURN(FILE) */
646int
647_pnfs_return_layout(struct inode *ino)
648{
649 struct pnfs_layout_hdr *lo = NULL;
650 struct nfs_inode *nfsi = NFS_I(ino);
651 LIST_HEAD(tmp_list);
652 struct nfs4_layoutreturn *lrp;
653 nfs4_stateid stateid;
654 int status = 0;
655
656 dprintk("--> %s\n", __func__);
657
658 spin_lock(&ino->i_lock);
659 lo = nfsi->layout;
660 if (!lo) {
661 spin_unlock(&ino->i_lock);
662 dprintk("%s: no layout to return\n", __func__);
663 return status;
664 }
665 stateid = nfsi->layout->plh_stateid;
666 /* Reference matched in nfs4_layoutreturn_release */
667 get_layout_hdr(lo);
668 mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
669 lo->plh_block_lgets++;
670 spin_unlock(&ino->i_lock);
671 pnfs_free_lseg_list(&tmp_list);
672
673 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));
674
675 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
676 if (unlikely(lrp == NULL)) {
677 status = -ENOMEM;
678 set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
679 set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
680 put_layout_hdr(lo);
681 goto out;
682 }
683
684 lrp->args.stateid = stateid;
685 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
686 lrp->args.inode = ino;
687 lrp->args.layout = lo;
688 lrp->clp = NFS_SERVER(ino)->nfs_client;
689
690 status = nfs4_proc_layoutreturn(lrp);
691out:
692 dprintk("<-- %s status: %d\n", __func__, status);
693 return status;
694}
695
696bool pnfs_roc(struct inode *ino)
697{
698 struct pnfs_layout_hdr *lo;
699 struct pnfs_layout_segment *lseg, *tmp;
700 LIST_HEAD(tmp_list);
701 bool found = false;
702
703 spin_lock(&ino->i_lock);
704 lo = NFS_I(ino)->layout;
705 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
706 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
707 goto out_nolayout;
708 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
709 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
710 mark_lseg_invalid(lseg, &tmp_list);
711 found = true;
712 }
713 if (!found)
714 goto out_nolayout;
715 lo->plh_block_lgets++;
716 get_layout_hdr(lo); /* matched in pnfs_roc_release */
717 spin_unlock(&ino->i_lock);
718 pnfs_free_lseg_list(&tmp_list);
719 return true;
720
721out_nolayout:
722 spin_unlock(&ino->i_lock);
723 return false;
724}
725
726void pnfs_roc_release(struct inode *ino)
727{
728 struct pnfs_layout_hdr *lo;
729
730 spin_lock(&ino->i_lock);
731 lo = NFS_I(ino)->layout;
732 lo->plh_block_lgets--;
733 put_layout_hdr_locked(lo);
734 spin_unlock(&ino->i_lock);
735}
736
737void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
738{
739 struct pnfs_layout_hdr *lo;
740
741 spin_lock(&ino->i_lock);
742 lo = NFS_I(ino)->layout;
743 if ((int)(barrier - lo->plh_barrier) > 0)
744 lo->plh_barrier = barrier;
745 spin_unlock(&ino->i_lock);
746}
747
748bool pnfs_roc_drain(struct inode *ino, u32 *barrier)
749{
750 struct nfs_inode *nfsi = NFS_I(ino);
751 struct pnfs_layout_segment *lseg;
752 bool found = false;
753
754 spin_lock(&ino->i_lock);
755 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
756 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
757 found = true;
758 break;
759 }
760 if (!found) {
761 struct pnfs_layout_hdr *lo = nfsi->layout;
762 u32 current_seqid = be32_to_cpu(lo->plh_stateid.stateid.seqid);
763
764 /* Since close does not return a layout stateid for use as
765 * a barrier, we choose the worst-case barrier.
766 */
767 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
768 }
769 spin_unlock(&ino->i_lock);
770 return found;
771}
772
773/*
774 * Compare two layout segments for sorting into layout cache.
775 * We want to preferentially return RW over RO layouts, so ensure those
776 * are seen first.
777 */
778static s64
779cmp_layout(struct pnfs_layout_range *l1,
780 struct pnfs_layout_range *l2)
781{
782 s64 d;
783
784 /* high offset > low offset */
785 d = l1->offset - l2->offset;
786 if (d)
787 return d;
788
789 /* short length > long length */
790 d = l2->length - l1->length;
791 if (d)
792 return d;
793
794 /* read > read/write */
795 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
796}
797
798static void
799pnfs_insert_layout(struct pnfs_layout_hdr *lo,
800 struct pnfs_layout_segment *lseg)
801{
802 struct pnfs_layout_segment *lp;
803
804 dprintk("%s:Begin\n", __func__);
805
806 assert_spin_locked(&lo->plh_inode->i_lock);
807 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
808 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
809 continue;
810 list_add_tail(&lseg->pls_list, &lp->pls_list);
811 dprintk("%s: inserted lseg %p "
812 "iomode %d offset %llu length %llu before "
813 "lp %p iomode %d offset %llu length %llu\n",
814 __func__, lseg, lseg->pls_range.iomode,
815 lseg->pls_range.offset, lseg->pls_range.length,
816 lp, lp->pls_range.iomode, lp->pls_range.offset,
817 lp->pls_range.length);
818 goto out;
819 }
820 list_add_tail(&lseg->pls_list, &lo->plh_segs);
821 dprintk("%s: inserted lseg %p "
822 "iomode %d offset %llu length %llu at tail\n",
823 __func__, lseg, lseg->pls_range.iomode,
824 lseg->pls_range.offset, lseg->pls_range.length);
825out:
826 get_layout_hdr(lo);
827
828 dprintk("%s:Return\n", __func__);
829}
830
831static struct pnfs_layout_hdr *
832alloc_init_layout_hdr(struct inode *ino,
833 struct nfs_open_context *ctx,
834 gfp_t gfp_flags)
835{
836 struct pnfs_layout_hdr *lo;
837
838 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
839 if (!lo)
840 return NULL;
841 atomic_set(&lo->plh_refcount, 1);
842 INIT_LIST_HEAD(&lo->plh_layouts);
843 INIT_LIST_HEAD(&lo->plh_segs);
844 INIT_LIST_HEAD(&lo->plh_bulk_recall);
845 lo->plh_inode = ino;
846 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
847 return lo;
848}
849
850static struct pnfs_layout_hdr *
851pnfs_find_alloc_layout(struct inode *ino,
852 struct nfs_open_context *ctx,
853 gfp_t gfp_flags)
854{
855 struct nfs_inode *nfsi = NFS_I(ino);
856 struct pnfs_layout_hdr *new = NULL;
857
858 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
859
860 assert_spin_locked(&ino->i_lock);
861 if (nfsi->layout) {
862 if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags))
863 return NULL;
864 else
865 return nfsi->layout;
866 }
867 spin_unlock(&ino->i_lock);
868 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
869 spin_lock(&ino->i_lock);
870
871 if (likely(nfsi->layout == NULL)) /* Won the race? */
872 nfsi->layout = new;
873 else
874 pnfs_free_layout_hdr(new);
875 return nfsi->layout;
876}
877
878/*
879 * iomode matching rules:
880 * iomode lseg match
881 * ----- ----- -----
882 * ANY READ true
883 * ANY RW true
884 * RW READ false
885 * RW RW true
886 * READ READ true
887 * READ RW true
888 */
889static int
890is_matching_lseg(struct pnfs_layout_range *ls_range,
891 struct pnfs_layout_range *range)
892{
893 struct pnfs_layout_range range1;
894
895 if ((range->iomode == IOMODE_RW &&
896 ls_range->iomode != IOMODE_RW) ||
897 !lo_seg_intersecting(ls_range, range))
898 return 0;
899
900 /* range1 covers only the first byte in the range */
901 range1 = *range;
902 range1.length = 1;
903 return lo_seg_contained(ls_range, &range1);
904}
905
906/*
907 * lookup range in layout
908 */
909static struct pnfs_layout_segment *
910pnfs_find_lseg(struct pnfs_layout_hdr *lo,
911 struct pnfs_layout_range *range)
912{
913 struct pnfs_layout_segment *lseg, *ret = NULL;
914
915 dprintk("%s:Begin\n", __func__);
916
917 assert_spin_locked(&lo->plh_inode->i_lock);
918 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
919 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
920 is_matching_lseg(&lseg->pls_range, range)) {
921 ret = get_lseg(lseg);
922 break;
923 }
924 if (lseg->pls_range.offset > range->offset)
925 break;
926 }
927
928 dprintk("%s:Return lseg %p ref %d\n",
929 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
930 return ret;
931}
932
933/*
934 * Layout segment is retreived from the server if not cached.
935 * The appropriate layout segment is referenced and returned to the caller.
936 */
937struct pnfs_layout_segment *
938pnfs_update_layout(struct inode *ino,
939 struct nfs_open_context *ctx,
940 loff_t pos,
941 u64 count,
942 enum pnfs_iomode iomode,
943 gfp_t gfp_flags)
944{
945 struct pnfs_layout_range arg = {
946 .iomode = iomode,
947 .offset = pos,
948 .length = count,
949 };
950 unsigned pg_offset;
951 struct nfs_inode *nfsi = NFS_I(ino);
952 struct nfs_server *server = NFS_SERVER(ino);
953 struct nfs_client *clp = server->nfs_client;
954 struct pnfs_layout_hdr *lo;
955 struct pnfs_layout_segment *lseg = NULL;
956 bool first = false;
957
958 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
959 return NULL;
960 spin_lock(&ino->i_lock);
961 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
962 if (lo == NULL) {
963 dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__);
964 goto out_unlock;
965 }
966
967 /* Do we even need to bother with this? */
968 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
969 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
970 dprintk("%s matches recall, use MDS\n", __func__);
971 goto out_unlock;
972 }
973
974 /* if LAYOUTGET already failed once we don't try again */
975 if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags))
976 goto out_unlock;
977
978 /* Check to see if the layout for the given range already exists */
979 lseg = pnfs_find_lseg(lo, &arg);
980 if (lseg)
981 goto out_unlock;
982
983 if (pnfs_layoutgets_blocked(lo, NULL, 0))
984 goto out_unlock;
985 atomic_inc(&lo->plh_outstanding);
986
987 get_layout_hdr(lo);
988 if (list_empty(&lo->plh_segs))
989 first = true;
990 spin_unlock(&ino->i_lock);
991 if (first) {
992 /* The lo must be on the clp list if there is any
993 * chance of a CB_LAYOUTRECALL(FILE) coming in.
994 */
995 spin_lock(&clp->cl_lock);
996 BUG_ON(!list_empty(&lo->plh_layouts));
997 list_add_tail(&lo->plh_layouts, &server->layouts);
998 spin_unlock(&clp->cl_lock);
999 }
1000
1001 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1002 if (pg_offset) {
1003 arg.offset -= pg_offset;
1004 arg.length += pg_offset;
1005 }
1006 if (arg.length != NFS4_MAX_UINT64)
1007 arg.length = PAGE_CACHE_ALIGN(arg.length);
1008
1009 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1010 if (!lseg && first) {
1011 spin_lock(&clp->cl_lock);
1012 list_del_init(&lo->plh_layouts);
1013 spin_unlock(&clp->cl_lock);
1014 }
1015 atomic_dec(&lo->plh_outstanding);
1016 put_layout_hdr(lo);
1017out:
1018 dprintk("%s end, state 0x%lx lseg %p\n", __func__,
1019 nfsi->layout ? nfsi->layout->plh_flags : -1, lseg);
1020 return lseg;
1021out_unlock:
1022 spin_unlock(&ino->i_lock);
1023 goto out;
1024}
1025EXPORT_SYMBOL_GPL(pnfs_update_layout);
1026
1027int
1028pnfs_layout_process(struct nfs4_layoutget *lgp)
1029{
1030 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1031 struct nfs4_layoutget_res *res = &lgp->res;
1032 struct pnfs_layout_segment *lseg;
1033 struct inode *ino = lo->plh_inode;
1034 struct nfs_client *clp = NFS_SERVER(ino)->nfs_client;
1035 int status = 0;
1036
1037 /* Inject layout blob into I/O device driver */
1038 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1039 if (!lseg || IS_ERR(lseg)) {
1040 if (!lseg)
1041 status = -ENOMEM;
1042 else
1043 status = PTR_ERR(lseg);
1044 dprintk("%s: Could not allocate layout: error %d\n",
1045 __func__, status);
1046 goto out;
1047 }
1048
1049 spin_lock(&ino->i_lock);
1050 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) ||
1051 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1052 dprintk("%s forget reply due to recall\n", __func__);
1053 goto out_forget_reply;
1054 }
1055
1056 if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) {
1057 dprintk("%s forget reply due to state\n", __func__);
1058 goto out_forget_reply;
1059 }
1060 init_lseg(lo, lseg);
1061 lseg->pls_range = res->range;
1062 *lgp->lsegpp = get_lseg(lseg);
1063 pnfs_insert_layout(lo, lseg);
1064
1065 if (res->return_on_close) {
1066 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1067 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1068 }
1069
1070 /* Done processing layoutget. Set the layout stateid */
1071 pnfs_set_layout_stateid(lo, &res->stateid, false);
1072 spin_unlock(&ino->i_lock);
1073out:
1074 return status;
1075
1076out_forget_reply:
1077 spin_unlock(&ino->i_lock);
1078 lseg->pls_layout = lo;
1079 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1080 goto out;
1081}
1082
1083void
1084pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1085{
1086 BUG_ON(pgio->pg_lseg != NULL);
1087
1088 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1089 req->wb_context,
1090 req_offset(req),
1091 req->wb_bytes,
1092 IOMODE_READ,
1093 GFP_KERNEL);
1094 /* If no lseg, fall back to read through mds */
1095 if (pgio->pg_lseg == NULL)
1096 nfs_pageio_reset_read_mds(pgio);
1097
1098}
1099EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1100
1101void
1102pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1103{
1104 BUG_ON(pgio->pg_lseg != NULL);
1105
1106 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1107 req->wb_context,
1108 req_offset(req),
1109 req->wb_bytes,
1110 IOMODE_RW,
1111 GFP_NOFS);
1112 /* If no lseg, fall back to write through mds */
1113 if (pgio->pg_lseg == NULL)
1114 nfs_pageio_reset_write_mds(pgio);
1115}
1116EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1117
1118bool
1119pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
1120{
1121 struct nfs_server *server = NFS_SERVER(inode);
1122 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1123
1124 if (ld == NULL)
1125 return false;
1126 nfs_pageio_init(pgio, inode, ld->pg_read_ops, server->rsize, 0);
1127 return true;
1128}
1129
1130bool
1131pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
1132{
1133 struct nfs_server *server = NFS_SERVER(inode);
1134 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1135
1136 if (ld == NULL)
1137 return false;
1138 nfs_pageio_init(pgio, inode, ld->pg_write_ops, server->wsize, ioflags);
1139 return true;
1140}
1141
1142bool
1143pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1144 struct nfs_page *req)
1145{
1146 if (pgio->pg_lseg == NULL)
1147 return nfs_generic_pg_test(pgio, prev, req);
1148
1149 /*
1150 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1151 * Note that this test makes several assumptions:
1152 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1153 * is known to lie within the range.
1154 * - that the nfs_page being tested is known to be contiguous with the
1155 * previous nfs_page.
1156 * - Layout ranges are page aligned, so we only have to test the
1157 * start offset of the request.
1158 *
1159 * Please also note that 'end_offset' is actually the offset of the
1160 * first byte that lies outside the pnfs_layout_range. FIXME?
1161 *
1162 */
1163 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
1164 pgio->pg_lseg->pls_range.length);
1165}
1166EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1167
1168/*
1169 * Called by non rpc-based layout drivers
1170 */
1171int
1172pnfs_ld_write_done(struct nfs_write_data *data)
1173{
1174 int status;
1175
1176 if (!data->pnfs_error) {
1177 pnfs_set_layoutcommit(data);
1178 data->mds_ops->rpc_call_done(&data->task, data);
1179 data->mds_ops->rpc_release(data);
1180 return 0;
1181 }
1182
1183 dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
1184 data->pnfs_error);
1185 status = nfs_initiate_write(data, NFS_CLIENT(data->inode),
1186 data->mds_ops, NFS_FILE_SYNC);
1187 return status ? : -EAGAIN;
1188}
1189EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1190
1191static void
1192pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1193 struct nfs_write_data *data)
1194{
1195 list_splice_tail_init(&data->pages, &desc->pg_list);
1196 if (data->req && list_empty(&data->req->wb_list))
1197 nfs_list_add_request(data->req, &desc->pg_list);
1198 nfs_pageio_reset_write_mds(desc);
1199 desc->pg_recoalesce = 1;
1200 nfs_writedata_release(data);
1201}
1202
1203static enum pnfs_try_status
1204pnfs_try_to_write_data(struct nfs_write_data *wdata,
1205 const struct rpc_call_ops *call_ops,
1206 struct pnfs_layout_segment *lseg,
1207 int how)
1208{
1209 struct inode *inode = wdata->inode;
1210 enum pnfs_try_status trypnfs;
1211 struct nfs_server *nfss = NFS_SERVER(inode);
1212
1213 wdata->mds_ops = call_ops;
1214 wdata->lseg = get_lseg(lseg);
1215
1216 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1217 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1218
1219 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1220 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1221 put_lseg(wdata->lseg);
1222 wdata->lseg = NULL;
1223 } else
1224 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1225
1226 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1227 return trypnfs;
1228}
1229
1230static void
1231pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
1232{
1233 struct nfs_write_data *data;
1234 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1235 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1236
1237 desc->pg_lseg = NULL;
1238 while (!list_empty(head)) {
1239 enum pnfs_try_status trypnfs;
1240
1241 data = list_entry(head->next, struct nfs_write_data, list);
1242 list_del_init(&data->list);
1243
1244 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
1245 if (trypnfs == PNFS_NOT_ATTEMPTED)
1246 pnfs_write_through_mds(desc, data);
1247 }
1248 put_lseg(lseg);
1249}
1250
1251int
1252pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1253{
1254 LIST_HEAD(head);
1255 int ret;
1256
1257 ret = nfs_generic_flush(desc, &head);
1258 if (ret != 0) {
1259 put_lseg(desc->pg_lseg);
1260 desc->pg_lseg = NULL;
1261 return ret;
1262 }
1263 pnfs_do_multiple_writes(desc, &head, desc->pg_ioflags);
1264 return 0;
1265}
1266EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1267
1268/*
1269 * Called by non rpc-based layout drivers
1270 */
1271int
1272pnfs_ld_read_done(struct nfs_read_data *data)
1273{
1274 int status;
1275
1276 if (!data->pnfs_error) {
1277 __nfs4_read_done_cb(data);
1278 data->mds_ops->rpc_call_done(&data->task, data);
1279 data->mds_ops->rpc_release(data);
1280 return 0;
1281 }
1282
1283 dprintk("%s: pnfs_error=%d, retry via MDS\n", __func__,
1284 data->pnfs_error);
1285 status = nfs_initiate_read(data, NFS_CLIENT(data->inode),
1286 data->mds_ops);
1287 return status ? : -EAGAIN;
1288}
1289EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1290
1291static void
1292pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1293 struct nfs_read_data *data)
1294{
1295 list_splice_tail_init(&data->pages, &desc->pg_list);
1296 if (data->req && list_empty(&data->req->wb_list))
1297 nfs_list_add_request(data->req, &desc->pg_list);
1298 nfs_pageio_reset_read_mds(desc);
1299 desc->pg_recoalesce = 1;
1300 nfs_readdata_release(data);
1301}
1302
1303/*
1304 * Call the appropriate parallel I/O subsystem read function.
1305 */
1306static enum pnfs_try_status
1307pnfs_try_to_read_data(struct nfs_read_data *rdata,
1308 const struct rpc_call_ops *call_ops,
1309 struct pnfs_layout_segment *lseg)
1310{
1311 struct inode *inode = rdata->inode;
1312 struct nfs_server *nfss = NFS_SERVER(inode);
1313 enum pnfs_try_status trypnfs;
1314
1315 rdata->mds_ops = call_ops;
1316 rdata->lseg = get_lseg(lseg);
1317
1318 dprintk("%s: Reading ino:%lu %u@%llu\n",
1319 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1320
1321 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1322 if (trypnfs == PNFS_NOT_ATTEMPTED) {
1323 put_lseg(rdata->lseg);
1324 rdata->lseg = NULL;
1325 } else {
1326 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1327 }
1328 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1329 return trypnfs;
1330}
1331
1332static void
1333pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
1334{
1335 struct nfs_read_data *data;
1336 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1337 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1338
1339 desc->pg_lseg = NULL;
1340 while (!list_empty(head)) {
1341 enum pnfs_try_status trypnfs;
1342
1343 data = list_entry(head->next, struct nfs_read_data, list);
1344 list_del_init(&data->list);
1345
1346 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
1347 if (trypnfs == PNFS_NOT_ATTEMPTED)
1348 pnfs_read_through_mds(desc, data);
1349 }
1350 put_lseg(lseg);
1351}
1352
1353int
1354pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
1355{
1356 LIST_HEAD(head);
1357 int ret;
1358
1359 ret = nfs_generic_pagein(desc, &head);
1360 if (ret != 0) {
1361 put_lseg(desc->pg_lseg);
1362 desc->pg_lseg = NULL;
1363 return ret;
1364 }
1365 pnfs_do_multiple_reads(desc, &head);
1366 return 0;
1367}
1368EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
1369
1370/*
1371 * There can be multiple RW segments.
1372 */
1373static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
1374{
1375 struct pnfs_layout_segment *lseg;
1376
1377 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
1378 if (lseg->pls_range.iomode == IOMODE_RW &&
1379 test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1380 list_add(&lseg->pls_lc_list, listp);
1381 }
1382}
1383
1384void
1385pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1386{
1387 struct nfs_inode *nfsi = NFS_I(wdata->inode);
1388 loff_t end_pos = wdata->mds_offset + wdata->res.count;
1389 bool mark_as_dirty = false;
1390
1391 spin_lock(&nfsi->vfs_inode.i_lock);
1392 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1393 mark_as_dirty = true;
1394 dprintk("%s: Set layoutcommit for inode %lu ",
1395 __func__, wdata->inode->i_ino);
1396 }
1397 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &wdata->lseg->pls_flags)) {
1398 /* references matched in nfs4_layoutcommit_release */
1399 get_lseg(wdata->lseg);
1400 }
1401 if (end_pos > nfsi->layout->plh_lwb)
1402 nfsi->layout->plh_lwb = end_pos;
1403 spin_unlock(&nfsi->vfs_inode.i_lock);
1404 dprintk("%s: lseg %p end_pos %llu\n",
1405 __func__, wdata->lseg, nfsi->layout->plh_lwb);
1406
1407 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1408 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1409 if (mark_as_dirty)
1410 mark_inode_dirty_sync(wdata->inode);
1411}
1412EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1413
1414void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
1415{
1416 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
1417
1418 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
1419 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
1420}
1421
1422/*
1423 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1424 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1425 * data to disk to allow the server to recover the data if it crashes.
1426 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1427 * is off, and a COMMIT is sent to a data server, or
1428 * if WRITEs to a data server return NFS_DATA_SYNC.
1429 */
1430int
1431pnfs_layoutcommit_inode(struct inode *inode, bool sync)
1432{
1433 struct nfs4_layoutcommit_data *data;
1434 struct nfs_inode *nfsi = NFS_I(inode);
1435 loff_t end_pos;
1436 int status = 0;
1437
1438 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1439
1440 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1441 return 0;
1442
1443 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1444 data = kzalloc(sizeof(*data), GFP_NOFS);
1445 if (!data) {
1446 mark_inode_dirty_sync(inode);
1447 status = -ENOMEM;
1448 goto out;
1449 }
1450
1451 INIT_LIST_HEAD(&data->lseg_list);
1452 spin_lock(&inode->i_lock);
1453 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1454 spin_unlock(&inode->i_lock);
1455 kfree(data);
1456 goto out;
1457 }
1458
1459 pnfs_list_write_lseg(inode, &data->lseg_list);
1460
1461 end_pos = nfsi->layout->plh_lwb;
1462 nfsi->layout->plh_lwb = 0;
1463
1464 memcpy(&data->args.stateid.data, nfsi->layout->plh_stateid.data,
1465 sizeof(nfsi->layout->plh_stateid.data));
1466 spin_unlock(&inode->i_lock);
1467
1468 data->args.inode = inode;
1469 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
1470 nfs_fattr_init(&data->fattr);
1471 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1472 data->res.fattr = &data->fattr;
1473 data->args.lastbytewritten = end_pos - 1;
1474 data->res.server = NFS_SERVER(inode);
1475
1476 status = nfs4_proc_layoutcommit(data, sync);
1477out:
1478 dprintk("<-- %s status %d\n", __func__, status);
1479 return status;
1480}
1/*
2 * pNFS functions to call and manage layout drivers.
3 *
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#include <linux/nfs_fs.h>
31#include <linux/nfs_page.h>
32#include <linux/module.h>
33#include <linux/sort.h>
34#include "internal.h"
35#include "pnfs.h"
36#include "iostat.h"
37#include "nfs4trace.h"
38#include "delegation.h"
39#include "nfs42.h"
40
41#define NFSDBG_FACILITY NFSDBG_PNFS
42#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
43
44/* Locking:
45 *
46 * pnfs_spinlock:
47 * protects pnfs_modules_tbl.
48 */
49static DEFINE_SPINLOCK(pnfs_spinlock);
50
51/*
52 * pnfs_modules_tbl holds all pnfs modules
53 */
54static LIST_HEAD(pnfs_modules_tbl);
55
56static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo);
57static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
58 struct list_head *free_me,
59 const struct pnfs_layout_range *range,
60 u32 seq);
61static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
62 struct list_head *tmp_list);
63
64/* Return the registered pnfs layout driver module matching given id */
65static struct pnfs_layoutdriver_type *
66find_pnfs_driver_locked(u32 id)
67{
68 struct pnfs_layoutdriver_type *local;
69
70 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
71 if (local->id == id)
72 goto out;
73 local = NULL;
74out:
75 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
76 return local;
77}
78
79static struct pnfs_layoutdriver_type *
80find_pnfs_driver(u32 id)
81{
82 struct pnfs_layoutdriver_type *local;
83
84 spin_lock(&pnfs_spinlock);
85 local = find_pnfs_driver_locked(id);
86 if (local != NULL && !try_module_get(local->owner)) {
87 dprintk("%s: Could not grab reference on module\n", __func__);
88 local = NULL;
89 }
90 spin_unlock(&pnfs_spinlock);
91 return local;
92}
93
94void
95unset_pnfs_layoutdriver(struct nfs_server *nfss)
96{
97 if (nfss->pnfs_curr_ld) {
98 if (nfss->pnfs_curr_ld->clear_layoutdriver)
99 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
100 /* Decrement the MDS count. Purge the deviceid cache if zero */
101 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
102 nfs4_deviceid_purge_client(nfss->nfs_client);
103 module_put(nfss->pnfs_curr_ld->owner);
104 }
105 nfss->pnfs_curr_ld = NULL;
106}
107
108/*
109 * When the server sends a list of layout types, we choose one in the order
110 * given in the list below.
111 *
112 * FIXME: should this list be configurable in some fashion? module param?
113 * mount option? something else?
114 */
115static const u32 ld_prefs[] = {
116 LAYOUT_SCSI,
117 LAYOUT_BLOCK_VOLUME,
118 LAYOUT_OSD2_OBJECTS,
119 LAYOUT_FLEX_FILES,
120 LAYOUT_NFSV4_1_FILES,
121 0
122};
123
124static int
125ld_cmp(const void *e1, const void *e2)
126{
127 u32 ld1 = *((u32 *)e1);
128 u32 ld2 = *((u32 *)e2);
129 int i;
130
131 for (i = 0; ld_prefs[i] != 0; i++) {
132 if (ld1 == ld_prefs[i])
133 return -1;
134
135 if (ld2 == ld_prefs[i])
136 return 1;
137 }
138 return 0;
139}
140
141/*
142 * Try to set the server's pnfs module to the pnfs layout type specified by id.
143 * Currently only one pNFS layout driver per filesystem is supported.
144 *
145 * @ids array of layout types supported by MDS.
146 */
147void
148set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
149 struct nfs_fsinfo *fsinfo)
150{
151 struct pnfs_layoutdriver_type *ld_type = NULL;
152 u32 id;
153 int i;
154
155 if (fsinfo->nlayouttypes == 0)
156 goto out_no_driver;
157 if (!(server->nfs_client->cl_exchange_flags &
158 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
159 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n",
160 __func__, server->nfs_client->cl_exchange_flags);
161 goto out_no_driver;
162 }
163
164 sort(fsinfo->layouttype, fsinfo->nlayouttypes,
165 sizeof(*fsinfo->layouttype), ld_cmp, NULL);
166
167 for (i = 0; i < fsinfo->nlayouttypes; i++) {
168 id = fsinfo->layouttype[i];
169 ld_type = find_pnfs_driver(id);
170 if (!ld_type) {
171 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX,
172 id);
173 ld_type = find_pnfs_driver(id);
174 }
175 if (ld_type)
176 break;
177 }
178
179 if (!ld_type) {
180 dprintk("%s: No pNFS module found!\n", __func__);
181 goto out_no_driver;
182 }
183
184 server->pnfs_curr_ld = ld_type;
185 if (ld_type->set_layoutdriver
186 && ld_type->set_layoutdriver(server, mntfh)) {
187 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
188 "driver %u.\n", __func__, id);
189 module_put(ld_type->owner);
190 goto out_no_driver;
191 }
192 /* Bump the MDS count */
193 atomic_inc(&server->nfs_client->cl_mds_count);
194
195 dprintk("%s: pNFS module for %u set\n", __func__, id);
196 return;
197
198out_no_driver:
199 dprintk("%s: Using NFSv4 I/O\n", __func__);
200 server->pnfs_curr_ld = NULL;
201}
202
203int
204pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
205{
206 int status = -EINVAL;
207 struct pnfs_layoutdriver_type *tmp;
208
209 if (ld_type->id == 0) {
210 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
211 return status;
212 }
213 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
214 printk(KERN_ERR "NFS: %s Layout driver must provide "
215 "alloc_lseg and free_lseg.\n", __func__);
216 return status;
217 }
218
219 spin_lock(&pnfs_spinlock);
220 tmp = find_pnfs_driver_locked(ld_type->id);
221 if (!tmp) {
222 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
223 status = 0;
224 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
225 ld_type->name);
226 } else {
227 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
228 __func__, ld_type->id);
229 }
230 spin_unlock(&pnfs_spinlock);
231
232 return status;
233}
234EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
235
236void
237pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
238{
239 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
240 spin_lock(&pnfs_spinlock);
241 list_del(&ld_type->pnfs_tblid);
242 spin_unlock(&pnfs_spinlock);
243}
244EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
245
246/*
247 * pNFS client layout cache
248 */
249
250/* Need to hold i_lock if caller does not already hold reference */
251void
252pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
253{
254 atomic_inc(&lo->plh_refcount);
255}
256
257static struct pnfs_layout_hdr *
258pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
259{
260 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
261 return ld->alloc_layout_hdr(ino, gfp_flags);
262}
263
264static void
265pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
266{
267 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
268 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
269
270 if (!list_empty(&lo->plh_layouts)) {
271 struct nfs_client *clp = server->nfs_client;
272
273 spin_lock(&clp->cl_lock);
274 list_del_init(&lo->plh_layouts);
275 spin_unlock(&clp->cl_lock);
276 }
277 put_rpccred(lo->plh_lc_cred);
278 return ld->free_layout_hdr(lo);
279}
280
281static void
282pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
283{
284 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
285 dprintk("%s: freeing layout cache %p\n", __func__, lo);
286 nfsi->layout = NULL;
287 /* Reset MDS Threshold I/O counters */
288 nfsi->write_io = 0;
289 nfsi->read_io = 0;
290}
291
292void
293pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
294{
295 struct inode *inode = lo->plh_inode;
296
297 pnfs_layoutreturn_before_put_layout_hdr(lo);
298
299 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
300 if (!list_empty(&lo->plh_segs))
301 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
302 pnfs_detach_layout_hdr(lo);
303 spin_unlock(&inode->i_lock);
304 pnfs_free_layout_hdr(lo);
305 }
306}
307
308static void
309pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode,
310 u32 seq)
311{
312 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode)
313 iomode = IOMODE_ANY;
314 lo->plh_return_iomode = iomode;
315 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
316 if (seq != 0) {
317 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq);
318 lo->plh_return_seq = seq;
319 }
320}
321
322static void
323pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo)
324{
325 lo->plh_return_iomode = 0;
326 lo->plh_return_seq = 0;
327 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags);
328}
329
330static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
331{
332 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
333 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
334 smp_mb__after_atomic();
335 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
336 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
337}
338
339static void
340pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg,
341 struct list_head *free_me)
342{
343 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags);
344 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
345 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags))
346 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
347 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
348 pnfs_lseg_dec_and_remove_zero(lseg, free_me);
349}
350
351/*
352 * Mark a pnfs_layout_hdr and all associated layout segments as invalid
353 *
354 * In order to continue using the pnfs_layout_hdr, a full recovery
355 * is required.
356 * Note that caller must hold inode->i_lock.
357 */
358int
359pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
360 struct list_head *lseg_list)
361{
362 struct pnfs_layout_range range = {
363 .iomode = IOMODE_ANY,
364 .offset = 0,
365 .length = NFS4_MAX_UINT64,
366 };
367 struct pnfs_layout_segment *lseg, *next;
368
369 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
370 pnfs_clear_layoutreturn_info(lo);
371 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
372 pnfs_clear_lseg_state(lseg, lseg_list);
373 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0);
374 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
375 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
376 pnfs_clear_layoutreturn_waitbit(lo);
377 return !list_empty(&lo->plh_segs);
378}
379
380static int
381pnfs_iomode_to_fail_bit(u32 iomode)
382{
383 return iomode == IOMODE_RW ?
384 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
385}
386
387static void
388pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
389{
390 lo->plh_retry_timestamp = jiffies;
391 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
392 atomic_inc(&lo->plh_refcount);
393}
394
395static void
396pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
397{
398 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
399 atomic_dec(&lo->plh_refcount);
400}
401
402static void
403pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
404{
405 struct inode *inode = lo->plh_inode;
406 struct pnfs_layout_range range = {
407 .iomode = iomode,
408 .offset = 0,
409 .length = NFS4_MAX_UINT64,
410 };
411 LIST_HEAD(head);
412
413 spin_lock(&inode->i_lock);
414 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
415 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0);
416 spin_unlock(&inode->i_lock);
417 pnfs_free_lseg_list(&head);
418 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
419 iomode == IOMODE_RW ? "RW" : "READ");
420}
421
422static bool
423pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
424{
425 unsigned long start, end;
426 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
427
428 if (test_bit(fail_bit, &lo->plh_flags) == 0)
429 return false;
430 end = jiffies;
431 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
432 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
433 /* It is time to retry the failed layoutgets */
434 pnfs_layout_clear_fail_bit(lo, fail_bit);
435 return false;
436 }
437 return true;
438}
439
440static void
441pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg,
442 const struct pnfs_layout_range *range,
443 const nfs4_stateid *stateid)
444{
445 INIT_LIST_HEAD(&lseg->pls_list);
446 INIT_LIST_HEAD(&lseg->pls_lc_list);
447 atomic_set(&lseg->pls_refcount, 1);
448 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
449 lseg->pls_layout = lo;
450 lseg->pls_range = *range;
451 lseg->pls_seq = be32_to_cpu(stateid->seqid);
452}
453
454static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
455{
456 if (lseg != NULL) {
457 struct inode *inode = lseg->pls_layout->plh_inode;
458 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg);
459 }
460}
461
462static void
463pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
464 struct pnfs_layout_segment *lseg)
465{
466 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
467 list_del_init(&lseg->pls_list);
468 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
469 atomic_dec(&lo->plh_refcount);
470 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
471 return;
472 if (list_empty(&lo->plh_segs) &&
473 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
474 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
475 if (atomic_read(&lo->plh_outstanding) == 0)
476 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
477 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
478 }
479}
480
481static bool
482pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo,
483 struct pnfs_layout_segment *lseg)
484{
485 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
486 pnfs_layout_is_valid(lo)) {
487 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
488 list_move_tail(&lseg->pls_list, &lo->plh_return_segs);
489 return true;
490 }
491 return false;
492}
493
494void
495pnfs_put_lseg(struct pnfs_layout_segment *lseg)
496{
497 struct pnfs_layout_hdr *lo;
498 struct inode *inode;
499
500 if (!lseg)
501 return;
502
503 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
504 atomic_read(&lseg->pls_refcount),
505 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
506
507 lo = lseg->pls_layout;
508 inode = lo->plh_inode;
509
510 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
511 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
512 spin_unlock(&inode->i_lock);
513 return;
514 }
515 pnfs_get_layout_hdr(lo);
516 pnfs_layout_remove_lseg(lo, lseg);
517 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg))
518 lseg = NULL;
519 spin_unlock(&inode->i_lock);
520 pnfs_free_lseg(lseg);
521 pnfs_put_layout_hdr(lo);
522 }
523}
524EXPORT_SYMBOL_GPL(pnfs_put_lseg);
525
526static void pnfs_free_lseg_async_work(struct work_struct *work)
527{
528 struct pnfs_layout_segment *lseg;
529 struct pnfs_layout_hdr *lo;
530
531 lseg = container_of(work, struct pnfs_layout_segment, pls_work);
532 lo = lseg->pls_layout;
533
534 pnfs_free_lseg(lseg);
535 pnfs_put_layout_hdr(lo);
536}
537
538static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
539{
540 INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
541 schedule_work(&lseg->pls_work);
542}
543
544void
545pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
546{
547 if (!lseg)
548 return;
549
550 assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
551
552 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
553 atomic_read(&lseg->pls_refcount),
554 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
555 if (atomic_dec_and_test(&lseg->pls_refcount)) {
556 struct pnfs_layout_hdr *lo = lseg->pls_layout;
557 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
558 return;
559 pnfs_layout_remove_lseg(lo, lseg);
560 if (!pnfs_cache_lseg_for_layoutreturn(lo, lseg)) {
561 pnfs_get_layout_hdr(lo);
562 pnfs_free_lseg_async(lseg);
563 }
564 }
565}
566EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
567
568/*
569 * is l2 fully contained in l1?
570 * start1 end1
571 * [----------------------------------)
572 * start2 end2
573 * [----------------)
574 */
575static bool
576pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
577 const struct pnfs_layout_range *l2)
578{
579 u64 start1 = l1->offset;
580 u64 end1 = pnfs_end_offset(start1, l1->length);
581 u64 start2 = l2->offset;
582 u64 end2 = pnfs_end_offset(start2, l2->length);
583
584 return (start1 <= start2) && (end1 >= end2);
585}
586
587static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
588 struct list_head *tmp_list)
589{
590 if (!atomic_dec_and_test(&lseg->pls_refcount))
591 return false;
592 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
593 list_add(&lseg->pls_list, tmp_list);
594 return true;
595}
596
597/* Returns 1 if lseg is removed from list, 0 otherwise */
598static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
599 struct list_head *tmp_list)
600{
601 int rv = 0;
602
603 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
604 /* Remove the reference keeping the lseg in the
605 * list. It will now be removed when all
606 * outstanding io is finished.
607 */
608 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
609 atomic_read(&lseg->pls_refcount));
610 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
611 rv = 1;
612 }
613 return rv;
614}
615
616/*
617 * Compare 2 layout stateid sequence ids, to see which is newer,
618 * taking into account wraparound issues.
619 */
620static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
621{
622 return (s32)(s1 - s2) > 0;
623}
624
625static bool
626pnfs_should_free_range(const struct pnfs_layout_range *lseg_range,
627 const struct pnfs_layout_range *recall_range)
628{
629 return (recall_range->iomode == IOMODE_ANY ||
630 lseg_range->iomode == recall_range->iomode) &&
631 pnfs_lseg_range_intersecting(lseg_range, recall_range);
632}
633
634static bool
635pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg,
636 const struct pnfs_layout_range *recall_range,
637 u32 seq)
638{
639 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq))
640 return false;
641 if (recall_range == NULL)
642 return true;
643 return pnfs_should_free_range(&lseg->pls_range, recall_range);
644}
645
646/**
647 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later
648 * @lo: layout header containing the lsegs
649 * @tmp_list: list head where doomed lsegs should go
650 * @recall_range: optional recall range argument to match (may be NULL)
651 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0)
652 *
653 * Walk the list of lsegs in the layout header, and tear down any that should
654 * be destroyed. If "recall_range" is specified then the segment must match
655 * that range. If "seq" is non-zero, then only match segments that were handed
656 * out at or before that sequence.
657 *
658 * Returns number of matching invalid lsegs remaining in list after scanning
659 * it and purging them.
660 */
661int
662pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
663 struct list_head *tmp_list,
664 const struct pnfs_layout_range *recall_range,
665 u32 seq)
666{
667 struct pnfs_layout_segment *lseg, *next;
668 int remaining = 0;
669
670 dprintk("%s:Begin lo %p\n", __func__, lo);
671
672 if (list_empty(&lo->plh_segs))
673 return 0;
674 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
675 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) {
676 dprintk("%s: freeing lseg %p iomode %d seq %u"
677 "offset %llu length %llu\n", __func__,
678 lseg, lseg->pls_range.iomode, lseg->pls_seq,
679 lseg->pls_range.offset, lseg->pls_range.length);
680 if (!mark_lseg_invalid(lseg, tmp_list))
681 remaining++;
682 }
683 dprintk("%s:Return %i\n", __func__, remaining);
684 return remaining;
685}
686
687static void
688pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo,
689 struct list_head *free_me,
690 const struct pnfs_layout_range *range,
691 u32 seq)
692{
693 struct pnfs_layout_segment *lseg, *next;
694
695 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) {
696 if (pnfs_match_lseg_recall(lseg, range, seq))
697 list_move_tail(&lseg->pls_list, free_me);
698 }
699}
700
701/* note free_me must contain lsegs from a single layout_hdr */
702void
703pnfs_free_lseg_list(struct list_head *free_me)
704{
705 struct pnfs_layout_segment *lseg, *tmp;
706
707 if (list_empty(free_me))
708 return;
709
710 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
711 list_del(&lseg->pls_list);
712 pnfs_free_lseg(lseg);
713 }
714}
715
716void
717pnfs_destroy_layout(struct nfs_inode *nfsi)
718{
719 struct pnfs_layout_hdr *lo;
720 LIST_HEAD(tmp_list);
721
722 spin_lock(&nfsi->vfs_inode.i_lock);
723 lo = nfsi->layout;
724 if (lo) {
725 pnfs_get_layout_hdr(lo);
726 pnfs_mark_layout_stateid_invalid(lo, &tmp_list);
727 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
728 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
729 spin_unlock(&nfsi->vfs_inode.i_lock);
730 pnfs_free_lseg_list(&tmp_list);
731 pnfs_put_layout_hdr(lo);
732 } else
733 spin_unlock(&nfsi->vfs_inode.i_lock);
734}
735EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
736
737static bool
738pnfs_layout_add_bulk_destroy_list(struct inode *inode,
739 struct list_head *layout_list)
740{
741 struct pnfs_layout_hdr *lo;
742 bool ret = false;
743
744 spin_lock(&inode->i_lock);
745 lo = NFS_I(inode)->layout;
746 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
747 pnfs_get_layout_hdr(lo);
748 list_add(&lo->plh_bulk_destroy, layout_list);
749 ret = true;
750 }
751 spin_unlock(&inode->i_lock);
752 return ret;
753}
754
755/* Caller must hold rcu_read_lock and clp->cl_lock */
756static int
757pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
758 struct nfs_server *server,
759 struct list_head *layout_list)
760{
761 struct pnfs_layout_hdr *lo, *next;
762 struct inode *inode;
763
764 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
765 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags))
766 continue;
767 inode = igrab(lo->plh_inode);
768 if (inode == NULL)
769 continue;
770 list_del_init(&lo->plh_layouts);
771 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
772 continue;
773 rcu_read_unlock();
774 spin_unlock(&clp->cl_lock);
775 iput(inode);
776 spin_lock(&clp->cl_lock);
777 rcu_read_lock();
778 return -EAGAIN;
779 }
780 return 0;
781}
782
783static int
784pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
785 bool is_bulk_recall)
786{
787 struct pnfs_layout_hdr *lo;
788 struct inode *inode;
789 LIST_HEAD(lseg_list);
790 int ret = 0;
791
792 while (!list_empty(layout_list)) {
793 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
794 plh_bulk_destroy);
795 dprintk("%s freeing layout for inode %lu\n", __func__,
796 lo->plh_inode->i_ino);
797 inode = lo->plh_inode;
798
799 pnfs_layoutcommit_inode(inode, false);
800
801 spin_lock(&inode->i_lock);
802 list_del_init(&lo->plh_bulk_destroy);
803 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
804 if (is_bulk_recall)
805 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
806 ret = -EAGAIN;
807 }
808 spin_unlock(&inode->i_lock);
809 pnfs_free_lseg_list(&lseg_list);
810 /* Free all lsegs that are attached to commit buckets */
811 nfs_commit_inode(inode, 0);
812 pnfs_put_layout_hdr(lo);
813 iput(inode);
814 }
815 return ret;
816}
817
818int
819pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
820 struct nfs_fsid *fsid,
821 bool is_recall)
822{
823 struct nfs_server *server;
824 LIST_HEAD(layout_list);
825
826 spin_lock(&clp->cl_lock);
827 rcu_read_lock();
828restart:
829 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
830 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
831 continue;
832 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
833 server,
834 &layout_list) != 0)
835 goto restart;
836 }
837 rcu_read_unlock();
838 spin_unlock(&clp->cl_lock);
839
840 if (list_empty(&layout_list))
841 return 0;
842 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
843}
844
845int
846pnfs_destroy_layouts_byclid(struct nfs_client *clp,
847 bool is_recall)
848{
849 struct nfs_server *server;
850 LIST_HEAD(layout_list);
851
852 spin_lock(&clp->cl_lock);
853 rcu_read_lock();
854restart:
855 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
856 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
857 server,
858 &layout_list) != 0)
859 goto restart;
860 }
861 rcu_read_unlock();
862 spin_unlock(&clp->cl_lock);
863
864 if (list_empty(&layout_list))
865 return 0;
866 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
867}
868
869/*
870 * Called by the state manger to remove all layouts established under an
871 * expired lease.
872 */
873void
874pnfs_destroy_all_layouts(struct nfs_client *clp)
875{
876 nfs4_deviceid_mark_client_invalid(clp);
877 nfs4_deviceid_purge_client(clp);
878
879 pnfs_destroy_layouts_byclid(clp, false);
880}
881
882/* update lo->plh_stateid with new if is more recent */
883void
884pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
885 bool update_barrier)
886{
887 u32 oldseq, newseq, new_barrier = 0;
888
889 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
890 newseq = be32_to_cpu(new->seqid);
891
892 if (!pnfs_layout_is_valid(lo)) {
893 nfs4_stateid_copy(&lo->plh_stateid, new);
894 lo->plh_barrier = newseq;
895 pnfs_clear_layoutreturn_info(lo);
896 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
897 return;
898 }
899 if (pnfs_seqid_is_newer(newseq, oldseq)) {
900 nfs4_stateid_copy(&lo->plh_stateid, new);
901 /*
902 * Because of wraparound, we want to keep the barrier
903 * "close" to the current seqids.
904 */
905 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
906 }
907 if (update_barrier)
908 new_barrier = be32_to_cpu(new->seqid);
909 else if (new_barrier == 0)
910 return;
911 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
912 lo->plh_barrier = new_barrier;
913}
914
915static bool
916pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
917 const nfs4_stateid *stateid)
918{
919 u32 seqid = be32_to_cpu(stateid->seqid);
920
921 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
922}
923
924/* lget is set to 1 if called from inside send_layoutget call chain */
925static bool
926pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
927{
928 return lo->plh_block_lgets ||
929 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
930}
931
932/*
933 * Get layout from server.
934 * for now, assume that whole file layouts are requested.
935 * arg->offset: 0
936 * arg->length: all ones
937 */
938static struct pnfs_layout_segment *
939send_layoutget(struct pnfs_layout_hdr *lo,
940 struct nfs_open_context *ctx,
941 nfs4_stateid *stateid,
942 const struct pnfs_layout_range *range,
943 long *timeout, gfp_t gfp_flags)
944{
945 struct inode *ino = lo->plh_inode;
946 struct nfs_server *server = NFS_SERVER(ino);
947 struct nfs4_layoutget *lgp;
948 loff_t i_size;
949
950 dprintk("--> %s\n", __func__);
951
952 /*
953 * Synchronously retrieve layout information from server and
954 * store in lseg. If we race with a concurrent seqid morphing
955 * op, then re-send the LAYOUTGET.
956 */
957 lgp = kzalloc(sizeof(*lgp), gfp_flags);
958 if (lgp == NULL)
959 return ERR_PTR(-ENOMEM);
960
961 i_size = i_size_read(ino);
962
963 lgp->args.minlength = PAGE_SIZE;
964 if (lgp->args.minlength > range->length)
965 lgp->args.minlength = range->length;
966 if (range->iomode == IOMODE_READ) {
967 if (range->offset >= i_size)
968 lgp->args.minlength = 0;
969 else if (i_size - range->offset < lgp->args.minlength)
970 lgp->args.minlength = i_size - range->offset;
971 }
972 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
973 pnfs_copy_range(&lgp->args.range, range);
974 lgp->args.type = server->pnfs_curr_ld->id;
975 lgp->args.inode = ino;
976 lgp->args.ctx = get_nfs_open_context(ctx);
977 nfs4_stateid_copy(&lgp->args.stateid, stateid);
978 lgp->gfp_flags = gfp_flags;
979 lgp->cred = lo->plh_lc_cred;
980
981 return nfs4_proc_layoutget(lgp, timeout, gfp_flags);
982}
983
984static void pnfs_clear_layoutcommit(struct inode *inode,
985 struct list_head *head)
986{
987 struct nfs_inode *nfsi = NFS_I(inode);
988 struct pnfs_layout_segment *lseg, *tmp;
989
990 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
991 return;
992 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
993 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
994 continue;
995 pnfs_lseg_dec_and_remove_zero(lseg, head);
996 }
997}
998
999void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
1000 const nfs4_stateid *arg_stateid,
1001 const struct pnfs_layout_range *range,
1002 const nfs4_stateid *stateid)
1003{
1004 struct inode *inode = lo->plh_inode;
1005 LIST_HEAD(freeme);
1006
1007 spin_lock(&inode->i_lock);
1008 if (!pnfs_layout_is_valid(lo) || !arg_stateid ||
1009 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
1010 goto out_unlock;
1011 if (stateid) {
1012 u32 seq = be32_to_cpu(arg_stateid->seqid);
1013
1014 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq);
1015 pnfs_free_returned_lsegs(lo, &freeme, range, seq);
1016 pnfs_set_layout_stateid(lo, stateid, true);
1017 } else
1018 pnfs_mark_layout_stateid_invalid(lo, &freeme);
1019out_unlock:
1020 pnfs_clear_layoutreturn_waitbit(lo);
1021 spin_unlock(&inode->i_lock);
1022 pnfs_free_lseg_list(&freeme);
1023
1024}
1025
1026static bool
1027pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo,
1028 nfs4_stateid *stateid,
1029 enum pnfs_iomode *iomode)
1030{
1031 /* Serialise LAYOUTGET/LAYOUTRETURN */
1032 if (atomic_read(&lo->plh_outstanding) != 0)
1033 return false;
1034 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
1035 return false;
1036 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1037 pnfs_get_layout_hdr(lo);
1038 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1039 if (stateid != NULL) {
1040 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1041 if (lo->plh_return_seq != 0)
1042 stateid->seqid = cpu_to_be32(lo->plh_return_seq);
1043 }
1044 if (iomode != NULL)
1045 *iomode = lo->plh_return_iomode;
1046 pnfs_clear_layoutreturn_info(lo);
1047 return true;
1048 }
1049 if (stateid != NULL)
1050 nfs4_stateid_copy(stateid, &lo->plh_stateid);
1051 if (iomode != NULL)
1052 *iomode = IOMODE_ANY;
1053 return true;
1054}
1055
1056static void
1057pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args,
1058 struct pnfs_layout_hdr *lo,
1059 const nfs4_stateid *stateid,
1060 enum pnfs_iomode iomode)
1061{
1062 struct inode *inode = lo->plh_inode;
1063
1064 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id;
1065 args->inode = inode;
1066 args->range.iomode = iomode;
1067 args->range.offset = 0;
1068 args->range.length = NFS4_MAX_UINT64;
1069 args->layout = lo;
1070 nfs4_stateid_copy(&args->stateid, stateid);
1071}
1072
1073static int
1074pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid,
1075 enum pnfs_iomode iomode, bool sync)
1076{
1077 struct inode *ino = lo->plh_inode;
1078 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1079 struct nfs4_layoutreturn *lrp;
1080 int status = 0;
1081
1082 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
1083 if (unlikely(lrp == NULL)) {
1084 status = -ENOMEM;
1085 spin_lock(&ino->i_lock);
1086 pnfs_clear_layoutreturn_waitbit(lo);
1087 spin_unlock(&ino->i_lock);
1088 pnfs_put_layout_hdr(lo);
1089 goto out;
1090 }
1091
1092 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode);
1093 lrp->args.ld_private = &lrp->ld_private;
1094 lrp->clp = NFS_SERVER(ino)->nfs_client;
1095 lrp->cred = lo->plh_lc_cred;
1096 if (ld->prepare_layoutreturn)
1097 ld->prepare_layoutreturn(&lrp->args);
1098
1099 status = nfs4_proc_layoutreturn(lrp, sync);
1100out:
1101 dprintk("<-- %s status: %d\n", __func__, status);
1102 return status;
1103}
1104
1105/* Return true if layoutreturn is needed */
1106static bool
1107pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
1108{
1109 struct pnfs_layout_segment *s;
1110
1111 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1112 return false;
1113
1114 /* Defer layoutreturn until all lsegs are done */
1115 list_for_each_entry(s, &lo->plh_segs, pls_list) {
1116 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
1117 return false;
1118 }
1119
1120 return true;
1121}
1122
1123static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo)
1124{
1125 struct inode *inode= lo->plh_inode;
1126
1127 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1128 return;
1129 spin_lock(&inode->i_lock);
1130 if (pnfs_layout_need_return(lo)) {
1131 nfs4_stateid stateid;
1132 enum pnfs_iomode iomode;
1133 bool send;
1134
1135 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1136 spin_unlock(&inode->i_lock);
1137 if (send) {
1138 /* Send an async layoutreturn so we dont deadlock */
1139 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
1140 }
1141 } else
1142 spin_unlock(&inode->i_lock);
1143}
1144
1145/*
1146 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
1147 * when the layout segment list is empty.
1148 *
1149 * Note that a pnfs_layout_hdr can exist with an empty layout segment
1150 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
1151 * deviceid is marked invalid.
1152 */
1153int
1154_pnfs_return_layout(struct inode *ino)
1155{
1156 struct pnfs_layout_hdr *lo = NULL;
1157 struct nfs_inode *nfsi = NFS_I(ino);
1158 LIST_HEAD(tmp_list);
1159 nfs4_stateid stateid;
1160 int status = 0;
1161 bool send;
1162
1163 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1164
1165 spin_lock(&ino->i_lock);
1166 lo = nfsi->layout;
1167 if (!lo) {
1168 spin_unlock(&ino->i_lock);
1169 dprintk("NFS: %s no layout to return\n", __func__);
1170 goto out;
1171 }
1172 /* Reference matched in nfs4_layoutreturn_release */
1173 pnfs_get_layout_hdr(lo);
1174 /* Is there an outstanding layoutreturn ? */
1175 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1176 spin_unlock(&ino->i_lock);
1177 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1178 TASK_UNINTERRUPTIBLE))
1179 goto out_put_layout_hdr;
1180 spin_lock(&ino->i_lock);
1181 }
1182 pnfs_clear_layoutcommit(ino, &tmp_list);
1183 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0);
1184
1185 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1186 struct pnfs_layout_range range = {
1187 .iomode = IOMODE_ANY,
1188 .offset = 0,
1189 .length = NFS4_MAX_UINT64,
1190 };
1191 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1192 }
1193
1194 /* Don't send a LAYOUTRETURN if list was initially empty */
1195 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
1196 spin_unlock(&ino->i_lock);
1197 dprintk("NFS: %s no layout segments to return\n", __func__);
1198 goto out_put_layout_hdr;
1199 }
1200
1201 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL);
1202 spin_unlock(&ino->i_lock);
1203 if (send)
1204 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true);
1205out_put_layout_hdr:
1206 pnfs_free_lseg_list(&tmp_list);
1207 pnfs_put_layout_hdr(lo);
1208out:
1209 dprintk("<-- %s status: %d\n", __func__, status);
1210 return status;
1211}
1212EXPORT_SYMBOL_GPL(_pnfs_return_layout);
1213
1214int
1215pnfs_commit_and_return_layout(struct inode *inode)
1216{
1217 struct pnfs_layout_hdr *lo;
1218 int ret;
1219
1220 spin_lock(&inode->i_lock);
1221 lo = NFS_I(inode)->layout;
1222 if (lo == NULL) {
1223 spin_unlock(&inode->i_lock);
1224 return 0;
1225 }
1226 pnfs_get_layout_hdr(lo);
1227 /* Block new layoutgets and read/write to ds */
1228 lo->plh_block_lgets++;
1229 spin_unlock(&inode->i_lock);
1230 filemap_fdatawait(inode->i_mapping);
1231 ret = pnfs_layoutcommit_inode(inode, true);
1232 if (ret == 0)
1233 ret = _pnfs_return_layout(inode);
1234 spin_lock(&inode->i_lock);
1235 lo->plh_block_lgets--;
1236 spin_unlock(&inode->i_lock);
1237 pnfs_put_layout_hdr(lo);
1238 return ret;
1239}
1240
1241bool pnfs_roc(struct inode *ino,
1242 struct nfs4_layoutreturn_args *args,
1243 struct nfs4_layoutreturn_res *res,
1244 const struct rpc_cred *cred)
1245{
1246 struct nfs_inode *nfsi = NFS_I(ino);
1247 struct nfs_open_context *ctx;
1248 struct nfs4_state *state;
1249 struct pnfs_layout_hdr *lo;
1250 struct pnfs_layout_segment *lseg, *next;
1251 nfs4_stateid stateid;
1252 enum pnfs_iomode iomode = 0;
1253 bool layoutreturn = false, roc = false;
1254 bool skip_read = false;
1255
1256 if (!nfs_have_layout(ino))
1257 return false;
1258retry:
1259 spin_lock(&ino->i_lock);
1260 lo = nfsi->layout;
1261 if (!lo || !pnfs_layout_is_valid(lo) ||
1262 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1263 goto out_noroc;
1264 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) {
1265 pnfs_get_layout_hdr(lo);
1266 spin_unlock(&ino->i_lock);
1267 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN,
1268 TASK_UNINTERRUPTIBLE);
1269 pnfs_put_layout_hdr(lo);
1270 goto retry;
1271 }
1272
1273 /* no roc if we hold a delegation */
1274 if (nfs4_check_delegation(ino, FMODE_READ)) {
1275 if (nfs4_check_delegation(ino, FMODE_WRITE))
1276 goto out_noroc;
1277 skip_read = true;
1278 }
1279
1280 list_for_each_entry(ctx, &nfsi->open_files, list) {
1281 state = ctx->state;
1282 if (state == NULL)
1283 continue;
1284 /* Don't return layout if there is open file state */
1285 if (state->state & FMODE_WRITE)
1286 goto out_noroc;
1287 if (state->state & FMODE_READ)
1288 skip_read = true;
1289 }
1290
1291
1292 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) {
1293 if (skip_read && lseg->pls_range.iomode == IOMODE_READ)
1294 continue;
1295 /* If we are sending layoutreturn, invalidate all valid lsegs */
1296 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags))
1297 continue;
1298 /*
1299 * Note: mark lseg for return so pnfs_layout_remove_lseg
1300 * doesn't invalidate the layout for us.
1301 */
1302 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1303 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs))
1304 continue;
1305 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0);
1306 }
1307
1308 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
1309 goto out_noroc;
1310
1311 /* ROC in two conditions:
1312 * 1. there are ROC lsegs
1313 * 2. we don't send layoutreturn
1314 */
1315 /* lo ref dropped in pnfs_roc_release() */
1316 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
1317 /* If the creds don't match, we can't compound the layoutreturn */
1318 if (!layoutreturn || cred != lo->plh_lc_cred)
1319 goto out_noroc;
1320
1321 roc = layoutreturn;
1322 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
1323 res->lrs_present = 0;
1324 layoutreturn = false;
1325
1326out_noroc:
1327 spin_unlock(&ino->i_lock);
1328 pnfs_layoutcommit_inode(ino, true);
1329 if (roc) {
1330 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
1331 if (ld->prepare_layoutreturn)
1332 ld->prepare_layoutreturn(args);
1333 return true;
1334 }
1335 if (layoutreturn)
1336 pnfs_send_layoutreturn(lo, &stateid, iomode, true);
1337 return false;
1338}
1339
1340void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
1341 struct nfs4_layoutreturn_res *res,
1342 int ret)
1343{
1344 struct pnfs_layout_hdr *lo = args->layout;
1345 const nfs4_stateid *arg_stateid = NULL;
1346 const nfs4_stateid *res_stateid = NULL;
1347 struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
1348
1349 if (ret == 0) {
1350 arg_stateid = &args->stateid;
1351 if (res->lrs_present)
1352 res_stateid = &res->stateid;
1353 }
1354 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range,
1355 res_stateid);
1356 if (ld_private && ld_private->ops && ld_private->ops->free)
1357 ld_private->ops->free(ld_private);
1358 pnfs_put_layout_hdr(lo);
1359 trace_nfs4_layoutreturn_on_close(args->inode, 0);
1360}
1361
1362bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1363{
1364 struct nfs_inode *nfsi = NFS_I(ino);
1365 struct pnfs_layout_hdr *lo;
1366 bool sleep = false;
1367
1368 /* we might not have grabbed lo reference. so need to check under
1369 * i_lock */
1370 spin_lock(&ino->i_lock);
1371 lo = nfsi->layout;
1372 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1373 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1374 sleep = true;
1375 }
1376 spin_unlock(&ino->i_lock);
1377 return sleep;
1378}
1379
1380/*
1381 * Compare two layout segments for sorting into layout cache.
1382 * We want to preferentially return RW over RO layouts, so ensure those
1383 * are seen first.
1384 */
1385static s64
1386pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1387 const struct pnfs_layout_range *l2)
1388{
1389 s64 d;
1390
1391 /* high offset > low offset */
1392 d = l1->offset - l2->offset;
1393 if (d)
1394 return d;
1395
1396 /* short length > long length */
1397 d = l2->length - l1->length;
1398 if (d)
1399 return d;
1400
1401 /* read > read/write */
1402 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1403}
1404
1405static bool
1406pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1407 const struct pnfs_layout_range *l2)
1408{
1409 return pnfs_lseg_range_cmp(l1, l2) > 0;
1410}
1411
1412static bool
1413pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1414 struct pnfs_layout_segment *old)
1415{
1416 return false;
1417}
1418
1419void
1420pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1421 struct pnfs_layout_segment *lseg,
1422 bool (*is_after)(const struct pnfs_layout_range *,
1423 const struct pnfs_layout_range *),
1424 bool (*do_merge)(struct pnfs_layout_segment *,
1425 struct pnfs_layout_segment *),
1426 struct list_head *free_me)
1427{
1428 struct pnfs_layout_segment *lp, *tmp;
1429
1430 dprintk("%s:Begin\n", __func__);
1431
1432 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1433 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1434 continue;
1435 if (do_merge(lseg, lp)) {
1436 mark_lseg_invalid(lp, free_me);
1437 continue;
1438 }
1439 if (is_after(&lseg->pls_range, &lp->pls_range))
1440 continue;
1441 list_add_tail(&lseg->pls_list, &lp->pls_list);
1442 dprintk("%s: inserted lseg %p "
1443 "iomode %d offset %llu length %llu before "
1444 "lp %p iomode %d offset %llu length %llu\n",
1445 __func__, lseg, lseg->pls_range.iomode,
1446 lseg->pls_range.offset, lseg->pls_range.length,
1447 lp, lp->pls_range.iomode, lp->pls_range.offset,
1448 lp->pls_range.length);
1449 goto out;
1450 }
1451 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1452 dprintk("%s: inserted lseg %p "
1453 "iomode %d offset %llu length %llu at tail\n",
1454 __func__, lseg, lseg->pls_range.iomode,
1455 lseg->pls_range.offset, lseg->pls_range.length);
1456out:
1457 pnfs_get_layout_hdr(lo);
1458
1459 dprintk("%s:Return\n", __func__);
1460}
1461EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1462
1463static void
1464pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1465 struct pnfs_layout_segment *lseg,
1466 struct list_head *free_me)
1467{
1468 struct inode *inode = lo->plh_inode;
1469 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1470
1471 if (ld->add_lseg != NULL)
1472 ld->add_lseg(lo, lseg, free_me);
1473 else
1474 pnfs_generic_layout_insert_lseg(lo, lseg,
1475 pnfs_lseg_range_is_after,
1476 pnfs_lseg_no_merge,
1477 free_me);
1478}
1479
1480static struct pnfs_layout_hdr *
1481alloc_init_layout_hdr(struct inode *ino,
1482 struct nfs_open_context *ctx,
1483 gfp_t gfp_flags)
1484{
1485 struct pnfs_layout_hdr *lo;
1486
1487 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1488 if (!lo)
1489 return NULL;
1490 atomic_set(&lo->plh_refcount, 1);
1491 INIT_LIST_HEAD(&lo->plh_layouts);
1492 INIT_LIST_HEAD(&lo->plh_segs);
1493 INIT_LIST_HEAD(&lo->plh_return_segs);
1494 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1495 lo->plh_inode = ino;
1496 lo->plh_lc_cred = get_rpccred(ctx->cred);
1497 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID;
1498 return lo;
1499}
1500
1501static struct pnfs_layout_hdr *
1502pnfs_find_alloc_layout(struct inode *ino,
1503 struct nfs_open_context *ctx,
1504 gfp_t gfp_flags)
1505 __releases(&ino->i_lock)
1506 __acquires(&ino->i_lock)
1507{
1508 struct nfs_inode *nfsi = NFS_I(ino);
1509 struct pnfs_layout_hdr *new = NULL;
1510
1511 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1512
1513 if (nfsi->layout != NULL)
1514 goto out_existing;
1515 spin_unlock(&ino->i_lock);
1516 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1517 spin_lock(&ino->i_lock);
1518
1519 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1520 nfsi->layout = new;
1521 return new;
1522 } else if (new != NULL)
1523 pnfs_free_layout_hdr(new);
1524out_existing:
1525 pnfs_get_layout_hdr(nfsi->layout);
1526 return nfsi->layout;
1527}
1528
1529/*
1530 * iomode matching rules:
1531 * iomode lseg strict match
1532 * iomode
1533 * ----- ----- ------ -----
1534 * ANY READ N/A true
1535 * ANY RW N/A true
1536 * RW READ N/A false
1537 * RW RW N/A true
1538 * READ READ N/A true
1539 * READ RW true false
1540 * READ RW false true
1541 */
1542static bool
1543pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1544 const struct pnfs_layout_range *range,
1545 bool strict_iomode)
1546{
1547 struct pnfs_layout_range range1;
1548
1549 if ((range->iomode == IOMODE_RW &&
1550 ls_range->iomode != IOMODE_RW) ||
1551 (range->iomode != ls_range->iomode &&
1552 strict_iomode == true) ||
1553 !pnfs_lseg_range_intersecting(ls_range, range))
1554 return 0;
1555
1556 /* range1 covers only the first byte in the range */
1557 range1 = *range;
1558 range1.length = 1;
1559 return pnfs_lseg_range_contained(ls_range, &range1);
1560}
1561
1562/*
1563 * lookup range in layout
1564 */
1565static struct pnfs_layout_segment *
1566pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1567 struct pnfs_layout_range *range,
1568 bool strict_iomode)
1569{
1570 struct pnfs_layout_segment *lseg, *ret = NULL;
1571
1572 dprintk("%s:Begin\n", __func__);
1573
1574 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1575 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1576 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1577 pnfs_lseg_range_match(&lseg->pls_range, range,
1578 strict_iomode)) {
1579 ret = pnfs_get_lseg(lseg);
1580 break;
1581 }
1582 }
1583
1584 dprintk("%s:Return lseg %p ref %d\n",
1585 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1586 return ret;
1587}
1588
1589/*
1590 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1591 * to the MDS or over pNFS
1592 *
1593 * The nfs_inode read_io and write_io fields are cumulative counters reset
1594 * when there are no layout segments. Note that in pnfs_update_layout iomode
1595 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1596 * WRITE request.
1597 *
1598 * A return of true means use MDS I/O.
1599 *
1600 * From rfc 5661:
1601 * If a file's size is smaller than the file size threshold, data accesses
1602 * SHOULD be sent to the metadata server. If an I/O request has a length that
1603 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1604 * server. If both file size and I/O size are provided, the client SHOULD
1605 * reach or exceed both thresholds before sending its read or write
1606 * requests to the data server.
1607 */
1608static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1609 struct inode *ino, int iomode)
1610{
1611 struct nfs4_threshold *t = ctx->mdsthreshold;
1612 struct nfs_inode *nfsi = NFS_I(ino);
1613 loff_t fsize = i_size_read(ino);
1614 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1615
1616 if (t == NULL)
1617 return ret;
1618
1619 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1620 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1621
1622 switch (iomode) {
1623 case IOMODE_READ:
1624 if (t->bm & THRESHOLD_RD) {
1625 dprintk("%s fsize %llu\n", __func__, fsize);
1626 size_set = true;
1627 if (fsize < t->rd_sz)
1628 size = true;
1629 }
1630 if (t->bm & THRESHOLD_RD_IO) {
1631 dprintk("%s nfsi->read_io %llu\n", __func__,
1632 nfsi->read_io);
1633 io_set = true;
1634 if (nfsi->read_io < t->rd_io_sz)
1635 io = true;
1636 }
1637 break;
1638 case IOMODE_RW:
1639 if (t->bm & THRESHOLD_WR) {
1640 dprintk("%s fsize %llu\n", __func__, fsize);
1641 size_set = true;
1642 if (fsize < t->wr_sz)
1643 size = true;
1644 }
1645 if (t->bm & THRESHOLD_WR_IO) {
1646 dprintk("%s nfsi->write_io %llu\n", __func__,
1647 nfsi->write_io);
1648 io_set = true;
1649 if (nfsi->write_io < t->wr_io_sz)
1650 io = true;
1651 }
1652 break;
1653 }
1654 if (size_set && io_set) {
1655 if (size && io)
1656 ret = true;
1657 } else if (size || io)
1658 ret = true;
1659
1660 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1661 return ret;
1662}
1663
1664static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1665{
1666 /*
1667 * send layoutcommit as it can hold up layoutreturn due to lseg
1668 * reference
1669 */
1670 pnfs_layoutcommit_inode(lo->plh_inode, false);
1671 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1672 nfs_wait_bit_killable,
1673 TASK_UNINTERRUPTIBLE);
1674}
1675
1676static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1677{
1678 unsigned long *bitlock = &lo->plh_flags;
1679
1680 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1681 smp_mb__after_atomic();
1682 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1683}
1684
1685/*
1686 * Layout segment is retreived from the server if not cached.
1687 * The appropriate layout segment is referenced and returned to the caller.
1688 */
1689struct pnfs_layout_segment *
1690pnfs_update_layout(struct inode *ino,
1691 struct nfs_open_context *ctx,
1692 loff_t pos,
1693 u64 count,
1694 enum pnfs_iomode iomode,
1695 bool strict_iomode,
1696 gfp_t gfp_flags)
1697{
1698 struct pnfs_layout_range arg = {
1699 .iomode = iomode,
1700 .offset = pos,
1701 .length = count,
1702 };
1703 unsigned pg_offset, seq;
1704 struct nfs_server *server = NFS_SERVER(ino);
1705 struct nfs_client *clp = server->nfs_client;
1706 struct pnfs_layout_hdr *lo = NULL;
1707 struct pnfs_layout_segment *lseg = NULL;
1708 nfs4_stateid stateid;
1709 long timeout = 0;
1710 unsigned long giveup = jiffies + (clp->cl_lease_time << 1);
1711 bool first;
1712
1713 if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
1714 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1715 PNFS_UPDATE_LAYOUT_NO_PNFS);
1716 goto out;
1717 }
1718
1719 if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
1720 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1721 PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
1722 goto out;
1723 }
1724
1725 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
1726 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1727 PNFS_UPDATE_LAYOUT_MDSTHRESH);
1728 goto out;
1729 }
1730
1731lookup_again:
1732 nfs4_client_recover_expired_lease(clp);
1733 first = false;
1734 spin_lock(&ino->i_lock);
1735 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1736 if (lo == NULL) {
1737 spin_unlock(&ino->i_lock);
1738 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1739 PNFS_UPDATE_LAYOUT_NOMEM);
1740 goto out;
1741 }
1742
1743 /* Do we even need to bother with this? */
1744 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1745 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1746 PNFS_UPDATE_LAYOUT_BULK_RECALL);
1747 dprintk("%s matches recall, use MDS\n", __func__);
1748 goto out_unlock;
1749 }
1750
1751 /* if LAYOUTGET already failed once we don't try again */
1752 if (pnfs_layout_io_test_failed(lo, iomode)) {
1753 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1754 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
1755 goto out_unlock;
1756 }
1757
1758 lseg = pnfs_find_lseg(lo, &arg, strict_iomode);
1759 if (lseg) {
1760 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1761 PNFS_UPDATE_LAYOUT_FOUND_CACHED);
1762 goto out_unlock;
1763 }
1764
1765 if (!nfs4_valid_open_stateid(ctx->state)) {
1766 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1767 PNFS_UPDATE_LAYOUT_INVALID_OPEN);
1768 goto out_unlock;
1769 }
1770
1771 /*
1772 * Choose a stateid for the LAYOUTGET. If we don't have a layout
1773 * stateid, or it has been invalidated, then we must use the open
1774 * stateid.
1775 */
1776 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
1777
1778 /*
1779 * The first layoutget for the file. Need to serialize per
1780 * RFC 5661 Errata 3208.
1781 */
1782 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1783 &lo->plh_flags)) {
1784 spin_unlock(&ino->i_lock);
1785 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1786 TASK_UNINTERRUPTIBLE);
1787 pnfs_put_layout_hdr(lo);
1788 dprintk("%s retrying\n", __func__);
1789 goto lookup_again;
1790 }
1791
1792 first = true;
1793 do {
1794 seq = read_seqbegin(&ctx->state->seqlock);
1795 nfs4_stateid_copy(&stateid, &ctx->state->stateid);
1796 } while (read_seqretry(&ctx->state->seqlock, seq));
1797 } else {
1798 nfs4_stateid_copy(&stateid, &lo->plh_stateid);
1799 }
1800
1801 /*
1802 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1803 * for LAYOUTRETURN even if first is true.
1804 */
1805 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1806 spin_unlock(&ino->i_lock);
1807 dprintk("%s wait for layoutreturn\n", __func__);
1808 if (pnfs_prepare_to_retry_layoutget(lo)) {
1809 if (first)
1810 pnfs_clear_first_layoutget(lo);
1811 pnfs_put_layout_hdr(lo);
1812 dprintk("%s retrying\n", __func__);
1813 trace_pnfs_update_layout(ino, pos, count, iomode, lo,
1814 lseg, PNFS_UPDATE_LAYOUT_RETRY);
1815 goto lookup_again;
1816 }
1817 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1818 PNFS_UPDATE_LAYOUT_RETURN);
1819 goto out_put_layout_hdr;
1820 }
1821
1822 if (pnfs_layoutgets_blocked(lo)) {
1823 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1824 PNFS_UPDATE_LAYOUT_BLOCKED);
1825 goto out_unlock;
1826 }
1827 atomic_inc(&lo->plh_outstanding);
1828 spin_unlock(&ino->i_lock);
1829
1830 if (list_empty(&lo->plh_layouts)) {
1831 /* The lo must be on the clp list if there is any
1832 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1833 */
1834 spin_lock(&clp->cl_lock);
1835 if (list_empty(&lo->plh_layouts))
1836 list_add_tail(&lo->plh_layouts, &server->layouts);
1837 spin_unlock(&clp->cl_lock);
1838 }
1839
1840 pg_offset = arg.offset & ~PAGE_MASK;
1841 if (pg_offset) {
1842 arg.offset -= pg_offset;
1843 arg.length += pg_offset;
1844 }
1845 if (arg.length != NFS4_MAX_UINT64)
1846 arg.length = PAGE_ALIGN(arg.length);
1847
1848 lseg = send_layoutget(lo, ctx, &stateid, &arg, &timeout, gfp_flags);
1849 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg,
1850 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
1851 atomic_dec(&lo->plh_outstanding);
1852 if (IS_ERR(lseg)) {
1853 switch(PTR_ERR(lseg)) {
1854 case -EBUSY:
1855 if (time_after(jiffies, giveup))
1856 lseg = NULL;
1857 break;
1858 case -ERECALLCONFLICT:
1859 /* Huh? We hold no layouts, how is there a recall? */
1860 if (first) {
1861 lseg = NULL;
1862 break;
1863 }
1864 /* Destroy the existing layout and start over */
1865 if (time_after(jiffies, giveup))
1866 pnfs_destroy_layout(NFS_I(ino));
1867 /* Fallthrough */
1868 case -EAGAIN:
1869 break;
1870 default:
1871 if (!nfs_error_is_fatal(PTR_ERR(lseg))) {
1872 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1873 lseg = NULL;
1874 }
1875 goto out_put_layout_hdr;
1876 }
1877 if (lseg) {
1878 if (first)
1879 pnfs_clear_first_layoutget(lo);
1880 trace_pnfs_update_layout(ino, pos, count,
1881 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY);
1882 pnfs_put_layout_hdr(lo);
1883 goto lookup_again;
1884 }
1885 } else {
1886 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
1887 }
1888
1889out_put_layout_hdr:
1890 if (first)
1891 pnfs_clear_first_layoutget(lo);
1892 pnfs_put_layout_hdr(lo);
1893out:
1894 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1895 "(%s, offset: %llu, length: %llu)\n",
1896 __func__, ino->i_sb->s_id,
1897 (unsigned long long)NFS_FILEID(ino),
1898 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1899 iomode==IOMODE_RW ? "read/write" : "read-only",
1900 (unsigned long long)pos,
1901 (unsigned long long)count);
1902 return lseg;
1903out_unlock:
1904 spin_unlock(&ino->i_lock);
1905 goto out_put_layout_hdr;
1906}
1907EXPORT_SYMBOL_GPL(pnfs_update_layout);
1908
1909static bool
1910pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1911{
1912 switch (range->iomode) {
1913 case IOMODE_READ:
1914 case IOMODE_RW:
1915 break;
1916 default:
1917 return false;
1918 }
1919 if (range->offset == NFS4_MAX_UINT64)
1920 return false;
1921 if (range->length == 0)
1922 return false;
1923 if (range->length != NFS4_MAX_UINT64 &&
1924 range->length > NFS4_MAX_UINT64 - range->offset)
1925 return false;
1926 return true;
1927}
1928
1929struct pnfs_layout_segment *
1930pnfs_layout_process(struct nfs4_layoutget *lgp)
1931{
1932 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1933 struct nfs4_layoutget_res *res = &lgp->res;
1934 struct pnfs_layout_segment *lseg;
1935 struct inode *ino = lo->plh_inode;
1936 LIST_HEAD(free_me);
1937
1938 if (!pnfs_sanity_check_layout_range(&res->range))
1939 return ERR_PTR(-EINVAL);
1940
1941 /* Inject layout blob into I/O device driver */
1942 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1943 if (IS_ERR_OR_NULL(lseg)) {
1944 if (!lseg)
1945 lseg = ERR_PTR(-ENOMEM);
1946
1947 dprintk("%s: Could not allocate layout: error %ld\n",
1948 __func__, PTR_ERR(lseg));
1949 return lseg;
1950 }
1951
1952 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid);
1953
1954 spin_lock(&ino->i_lock);
1955 if (pnfs_layoutgets_blocked(lo)) {
1956 dprintk("%s forget reply due to state\n", __func__);
1957 goto out_forget;
1958 }
1959
1960 if (!pnfs_layout_is_valid(lo)) {
1961 /* We have a completely new layout */
1962 pnfs_set_layout_stateid(lo, &res->stateid, true);
1963 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1964 /* existing state ID, make sure the sequence number matches. */
1965 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1966 dprintk("%s forget reply due to sequence\n", __func__);
1967 goto out_forget;
1968 }
1969 pnfs_set_layout_stateid(lo, &res->stateid, false);
1970 } else {
1971 /*
1972 * We got an entirely new state ID. Mark all segments for the
1973 * inode invalid, and retry the layoutget
1974 */
1975 pnfs_mark_layout_stateid_invalid(lo, &free_me);
1976 goto out_forget;
1977 }
1978
1979 pnfs_get_lseg(lseg);
1980 pnfs_layout_insert_lseg(lo, lseg, &free_me);
1981
1982
1983 if (res->return_on_close)
1984 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1985
1986 spin_unlock(&ino->i_lock);
1987 pnfs_free_lseg_list(&free_me);
1988 return lseg;
1989
1990out_forget:
1991 spin_unlock(&ino->i_lock);
1992 lseg->pls_layout = lo;
1993 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1994 return ERR_PTR(-EAGAIN);
1995}
1996
1997/**
1998 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments
1999 * @lo: pointer to layout header
2000 * @tmp_list: list header to be used with pnfs_free_lseg_list()
2001 * @return_range: describe layout segment ranges to be returned
2002 *
2003 * This function is mainly intended for use by layoutrecall. It attempts
2004 * to free the layout segment immediately, or else to mark it for return
2005 * as soon as its reference count drops to zero.
2006 */
2007int
2008pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
2009 struct list_head *tmp_list,
2010 const struct pnfs_layout_range *return_range,
2011 u32 seq)
2012{
2013 struct pnfs_layout_segment *lseg, *next;
2014 int remaining = 0;
2015
2016 dprintk("%s:Begin lo %p\n", __func__, lo);
2017
2018 if (list_empty(&lo->plh_segs))
2019 return 0;
2020
2021 assert_spin_locked(&lo->plh_inode->i_lock);
2022
2023 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
2024 if (pnfs_match_lseg_recall(lseg, return_range, seq)) {
2025 dprintk("%s: marking lseg %p iomode %d "
2026 "offset %llu length %llu\n", __func__,
2027 lseg, lseg->pls_range.iomode,
2028 lseg->pls_range.offset,
2029 lseg->pls_range.length);
2030 if (mark_lseg_invalid(lseg, tmp_list))
2031 continue;
2032 remaining++;
2033 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
2034 }
2035
2036 if (remaining)
2037 pnfs_set_plh_return_info(lo, return_range->iomode, seq);
2038
2039 return remaining;
2040}
2041
2042void pnfs_error_mark_layout_for_return(struct inode *inode,
2043 struct pnfs_layout_segment *lseg)
2044{
2045 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
2046 struct pnfs_layout_range range = {
2047 .iomode = lseg->pls_range.iomode,
2048 .offset = 0,
2049 .length = NFS4_MAX_UINT64,
2050 };
2051 bool return_now = false;
2052
2053 spin_lock(&inode->i_lock);
2054 pnfs_set_plh_return_info(lo, range.iomode, 0);
2055 /* Block LAYOUTGET */
2056 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
2057 /*
2058 * mark all matching lsegs so that we are sure to have no live
2059 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
2060 * for how it works.
2061 */
2062 if (!pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0)) {
2063 nfs4_stateid stateid;
2064 enum pnfs_iomode iomode;
2065
2066 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode);
2067 spin_unlock(&inode->i_lock);
2068 if (return_now)
2069 pnfs_send_layoutreturn(lo, &stateid, iomode, false);
2070 } else {
2071 spin_unlock(&inode->i_lock);
2072 nfs_commit_inode(inode, 0);
2073 }
2074}
2075EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
2076
2077void
2078pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
2079{
2080 u64 rd_size = req->wb_bytes;
2081
2082 if (pgio->pg_lseg == NULL) {
2083 if (pgio->pg_dreq == NULL)
2084 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
2085 else
2086 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
2087
2088 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2089 req->wb_context,
2090 req_offset(req),
2091 rd_size,
2092 IOMODE_READ,
2093 false,
2094 GFP_KERNEL);
2095 if (IS_ERR(pgio->pg_lseg)) {
2096 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2097 pgio->pg_lseg = NULL;
2098 return;
2099 }
2100 }
2101 /* If no lseg, fall back to read through mds */
2102 if (pgio->pg_lseg == NULL)
2103 nfs_pageio_reset_read_mds(pgio);
2104
2105}
2106EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
2107
2108void
2109pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
2110 struct nfs_page *req, u64 wb_size)
2111{
2112 if (pgio->pg_lseg == NULL) {
2113 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
2114 req->wb_context,
2115 req_offset(req),
2116 wb_size,
2117 IOMODE_RW,
2118 false,
2119 GFP_NOFS);
2120 if (IS_ERR(pgio->pg_lseg)) {
2121 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
2122 pgio->pg_lseg = NULL;
2123 return;
2124 }
2125 }
2126 /* If no lseg, fall back to write through mds */
2127 if (pgio->pg_lseg == NULL)
2128 nfs_pageio_reset_write_mds(pgio);
2129}
2130EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
2131
2132void
2133pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
2134{
2135 if (desc->pg_lseg) {
2136 pnfs_put_lseg(desc->pg_lseg);
2137 desc->pg_lseg = NULL;
2138 }
2139}
2140EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
2141
2142/*
2143 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
2144 * of bytes (maximum @req->wb_bytes) that can be coalesced.
2145 */
2146size_t
2147pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
2148 struct nfs_page *prev, struct nfs_page *req)
2149{
2150 unsigned int size;
2151 u64 seg_end, req_start, seg_left;
2152
2153 size = nfs_generic_pg_test(pgio, prev, req);
2154 if (!size)
2155 return 0;
2156
2157 /*
2158 * 'size' contains the number of bytes left in the current page (up
2159 * to the original size asked for in @req->wb_bytes).
2160 *
2161 * Calculate how many bytes are left in the layout segment
2162 * and if there are less bytes than 'size', return that instead.
2163 *
2164 * Please also note that 'end_offset' is actually the offset of the
2165 * first byte that lies outside the pnfs_layout_range. FIXME?
2166 *
2167 */
2168 if (pgio->pg_lseg) {
2169 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset,
2170 pgio->pg_lseg->pls_range.length);
2171 req_start = req_offset(req);
2172 WARN_ON_ONCE(req_start >= seg_end);
2173 /* start of request is past the last byte of this segment */
2174 if (req_start >= seg_end) {
2175 /* reference the new lseg */
2176 if (pgio->pg_ops->pg_cleanup)
2177 pgio->pg_ops->pg_cleanup(pgio);
2178 if (pgio->pg_ops->pg_init)
2179 pgio->pg_ops->pg_init(pgio, req);
2180 return 0;
2181 }
2182
2183 /* adjust 'size' iff there are fewer bytes left in the
2184 * segment than what nfs_generic_pg_test returned */
2185 seg_left = seg_end - req_start;
2186 if (seg_left < size)
2187 size = (unsigned int)seg_left;
2188 }
2189
2190 return size;
2191}
2192EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
2193
2194int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
2195{
2196 struct nfs_pageio_descriptor pgio;
2197
2198 /* Resend all requests through the MDS */
2199 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
2200 hdr->completion_ops);
2201 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
2202 return nfs_pageio_resend(&pgio, hdr);
2203}
2204EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
2205
2206static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
2207{
2208
2209 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
2210 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2211 PNFS_LAYOUTRET_ON_ERROR) {
2212 pnfs_return_layout(hdr->inode);
2213 }
2214 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2215 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
2216}
2217
2218/*
2219 * Called by non rpc-based layout drivers
2220 */
2221void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
2222{
2223 if (likely(!hdr->pnfs_error)) {
2224 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
2225 hdr->mds_offset + hdr->res.count);
2226 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2227 }
2228 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
2229 if (unlikely(hdr->pnfs_error))
2230 pnfs_ld_handle_write_error(hdr);
2231 hdr->mds_ops->rpc_release(hdr);
2232}
2233EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
2234
2235static void
2236pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
2237 struct nfs_pgio_header *hdr)
2238{
2239 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2240
2241 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2242 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2243 nfs_pageio_reset_write_mds(desc);
2244 mirror->pg_recoalesce = 1;
2245 }
2246 nfs_pgio_data_destroy(hdr);
2247 hdr->release(hdr);
2248}
2249
2250static enum pnfs_try_status
2251pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
2252 const struct rpc_call_ops *call_ops,
2253 struct pnfs_layout_segment *lseg,
2254 int how)
2255{
2256 struct inode *inode = hdr->inode;
2257 enum pnfs_try_status trypnfs;
2258 struct nfs_server *nfss = NFS_SERVER(inode);
2259
2260 hdr->mds_ops = call_ops;
2261
2262 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
2263 inode->i_ino, hdr->args.count, hdr->args.offset, how);
2264 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
2265 if (trypnfs != PNFS_NOT_ATTEMPTED)
2266 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
2267 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2268 return trypnfs;
2269}
2270
2271static void
2272pnfs_do_write(struct nfs_pageio_descriptor *desc,
2273 struct nfs_pgio_header *hdr, int how)
2274{
2275 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2276 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2277 enum pnfs_try_status trypnfs;
2278
2279 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
2280 if (trypnfs == PNFS_NOT_ATTEMPTED)
2281 pnfs_write_through_mds(desc, hdr);
2282}
2283
2284static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
2285{
2286 pnfs_put_lseg(hdr->lseg);
2287 nfs_pgio_header_free(hdr);
2288}
2289
2290int
2291pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2292{
2293 struct nfs_pgio_header *hdr;
2294 int ret;
2295
2296 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2297 if (!hdr) {
2298 desc->pg_error = -ENOMEM;
2299 return desc->pg_error;
2300 }
2301 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2302
2303 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2304 ret = nfs_generic_pgio(desc, hdr);
2305 if (!ret)
2306 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2307
2308 return ret;
2309}
2310EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2311
2312int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2313{
2314 struct nfs_pageio_descriptor pgio;
2315
2316 /* Resend all requests through the MDS */
2317 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2318 return nfs_pageio_resend(&pgio, hdr);
2319}
2320EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2321
2322static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2323{
2324 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2325 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2326 PNFS_LAYOUTRET_ON_ERROR) {
2327 pnfs_return_layout(hdr->inode);
2328 }
2329 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2330 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2331}
2332
2333/*
2334 * Called by non rpc-based layout drivers
2335 */
2336void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2337{
2338 if (likely(!hdr->pnfs_error))
2339 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2340 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2341 if (unlikely(hdr->pnfs_error))
2342 pnfs_ld_handle_read_error(hdr);
2343 hdr->mds_ops->rpc_release(hdr);
2344}
2345EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2346
2347static void
2348pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2349 struct nfs_pgio_header *hdr)
2350{
2351 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2352
2353 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2354 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2355 nfs_pageio_reset_read_mds(desc);
2356 mirror->pg_recoalesce = 1;
2357 }
2358 nfs_pgio_data_destroy(hdr);
2359 hdr->release(hdr);
2360}
2361
2362/*
2363 * Call the appropriate parallel I/O subsystem read function.
2364 */
2365static enum pnfs_try_status
2366pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2367 const struct rpc_call_ops *call_ops,
2368 struct pnfs_layout_segment *lseg)
2369{
2370 struct inode *inode = hdr->inode;
2371 struct nfs_server *nfss = NFS_SERVER(inode);
2372 enum pnfs_try_status trypnfs;
2373
2374 hdr->mds_ops = call_ops;
2375
2376 dprintk("%s: Reading ino:%lu %u@%llu\n",
2377 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2378
2379 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2380 if (trypnfs != PNFS_NOT_ATTEMPTED)
2381 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2382 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2383 return trypnfs;
2384}
2385
2386/* Resend all requests through pnfs. */
2387void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2388{
2389 struct nfs_pageio_descriptor pgio;
2390
2391 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2392 /* Prevent deadlocks with layoutreturn! */
2393 pnfs_put_lseg(hdr->lseg);
2394 hdr->lseg = NULL;
2395
2396 nfs_pageio_init_read(&pgio, hdr->inode, false,
2397 hdr->completion_ops);
2398 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
2399 }
2400}
2401EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2402
2403static void
2404pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2405{
2406 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2407 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2408 enum pnfs_try_status trypnfs;
2409
2410 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2411 if (trypnfs == PNFS_TRY_AGAIN)
2412 pnfs_read_resend_pnfs(hdr);
2413 if (trypnfs == PNFS_NOT_ATTEMPTED || hdr->task.tk_status)
2414 pnfs_read_through_mds(desc, hdr);
2415}
2416
2417static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2418{
2419 pnfs_put_lseg(hdr->lseg);
2420 nfs_pgio_header_free(hdr);
2421}
2422
2423int
2424pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2425{
2426 struct nfs_pgio_header *hdr;
2427 int ret;
2428
2429 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2430 if (!hdr) {
2431 desc->pg_error = -ENOMEM;
2432 return desc->pg_error;
2433 }
2434 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2435 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2436 ret = nfs_generic_pgio(desc, hdr);
2437 if (!ret)
2438 pnfs_do_read(desc, hdr);
2439 return ret;
2440}
2441EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2442
2443static void pnfs_clear_layoutcommitting(struct inode *inode)
2444{
2445 unsigned long *bitlock = &NFS_I(inode)->flags;
2446
2447 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2448 smp_mb__after_atomic();
2449 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2450}
2451
2452/*
2453 * There can be multiple RW segments.
2454 */
2455static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2456{
2457 struct pnfs_layout_segment *lseg;
2458
2459 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2460 if (lseg->pls_range.iomode == IOMODE_RW &&
2461 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2462 list_add(&lseg->pls_lc_list, listp);
2463 }
2464}
2465
2466static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2467{
2468 struct pnfs_layout_segment *lseg, *tmp;
2469
2470 /* Matched by references in pnfs_set_layoutcommit */
2471 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2472 list_del_init(&lseg->pls_lc_list);
2473 pnfs_put_lseg(lseg);
2474 }
2475
2476 pnfs_clear_layoutcommitting(inode);
2477}
2478
2479void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2480{
2481 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2482}
2483EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2484
2485void
2486pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2487 loff_t end_pos)
2488{
2489 struct nfs_inode *nfsi = NFS_I(inode);
2490 bool mark_as_dirty = false;
2491
2492 spin_lock(&inode->i_lock);
2493 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2494 nfsi->layout->plh_lwb = end_pos;
2495 mark_as_dirty = true;
2496 dprintk("%s: Set layoutcommit for inode %lu ",
2497 __func__, inode->i_ino);
2498 } else if (end_pos > nfsi->layout->plh_lwb)
2499 nfsi->layout->plh_lwb = end_pos;
2500 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2501 /* references matched in nfs4_layoutcommit_release */
2502 pnfs_get_lseg(lseg);
2503 }
2504 spin_unlock(&inode->i_lock);
2505 dprintk("%s: lseg %p end_pos %llu\n",
2506 __func__, lseg, nfsi->layout->plh_lwb);
2507
2508 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2509 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2510 if (mark_as_dirty)
2511 mark_inode_dirty_sync(inode);
2512}
2513EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2514
2515void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2516{
2517 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2518
2519 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2520 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2521 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2522}
2523
2524/*
2525 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2526 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2527 * data to disk to allow the server to recover the data if it crashes.
2528 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2529 * is off, and a COMMIT is sent to a data server, or
2530 * if WRITEs to a data server return NFS_DATA_SYNC.
2531 */
2532int
2533pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2534{
2535 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2536 struct nfs4_layoutcommit_data *data;
2537 struct nfs_inode *nfsi = NFS_I(inode);
2538 loff_t end_pos;
2539 int status;
2540
2541 if (!pnfs_layoutcommit_outstanding(inode))
2542 return 0;
2543
2544 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2545
2546 status = -EAGAIN;
2547 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2548 if (!sync)
2549 goto out;
2550 status = wait_on_bit_lock_action(&nfsi->flags,
2551 NFS_INO_LAYOUTCOMMITTING,
2552 nfs_wait_bit_killable,
2553 TASK_KILLABLE);
2554 if (status)
2555 goto out;
2556 }
2557
2558 status = -ENOMEM;
2559 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2560 data = kzalloc(sizeof(*data), GFP_NOFS);
2561 if (!data)
2562 goto clear_layoutcommitting;
2563
2564 status = 0;
2565 spin_lock(&inode->i_lock);
2566 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2567 goto out_unlock;
2568
2569 INIT_LIST_HEAD(&data->lseg_list);
2570 pnfs_list_write_lseg(inode, &data->lseg_list);
2571
2572 end_pos = nfsi->layout->plh_lwb;
2573
2574 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2575 spin_unlock(&inode->i_lock);
2576
2577 data->args.inode = inode;
2578 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2579 nfs_fattr_init(&data->fattr);
2580 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2581 data->res.fattr = &data->fattr;
2582 if (end_pos != 0)
2583 data->args.lastbytewritten = end_pos - 1;
2584 else
2585 data->args.lastbytewritten = U64_MAX;
2586 data->res.server = NFS_SERVER(inode);
2587
2588 if (ld->prepare_layoutcommit) {
2589 status = ld->prepare_layoutcommit(&data->args);
2590 if (status) {
2591 put_rpccred(data->cred);
2592 spin_lock(&inode->i_lock);
2593 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2594 if (end_pos > nfsi->layout->plh_lwb)
2595 nfsi->layout->plh_lwb = end_pos;
2596 goto out_unlock;
2597 }
2598 }
2599
2600
2601 status = nfs4_proc_layoutcommit(data, sync);
2602out:
2603 if (status)
2604 mark_inode_dirty_sync(inode);
2605 dprintk("<-- %s status %d\n", __func__, status);
2606 return status;
2607out_unlock:
2608 spin_unlock(&inode->i_lock);
2609 kfree(data);
2610clear_layoutcommitting:
2611 pnfs_clear_layoutcommitting(inode);
2612 goto out;
2613}
2614EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2615
2616int
2617pnfs_generic_sync(struct inode *inode, bool datasync)
2618{
2619 return pnfs_layoutcommit_inode(inode, true);
2620}
2621EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2622
2623struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2624{
2625 struct nfs4_threshold *thp;
2626
2627 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2628 if (!thp) {
2629 dprintk("%s mdsthreshold allocation failed\n", __func__);
2630 return NULL;
2631 }
2632 return thp;
2633}
2634
2635#if IS_ENABLED(CONFIG_NFS_V4_2)
2636int
2637pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2638{
2639 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2640 struct nfs_server *server = NFS_SERVER(inode);
2641 struct nfs_inode *nfsi = NFS_I(inode);
2642 struct nfs42_layoutstat_data *data;
2643 struct pnfs_layout_hdr *hdr;
2644 int status = 0;
2645
2646 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2647 goto out;
2648
2649 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2650 goto out;
2651
2652 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2653 goto out;
2654
2655 spin_lock(&inode->i_lock);
2656 if (!NFS_I(inode)->layout) {
2657 spin_unlock(&inode->i_lock);
2658 goto out_clear_layoutstats;
2659 }
2660 hdr = NFS_I(inode)->layout;
2661 pnfs_get_layout_hdr(hdr);
2662 spin_unlock(&inode->i_lock);
2663
2664 data = kzalloc(sizeof(*data), gfp_flags);
2665 if (!data) {
2666 status = -ENOMEM;
2667 goto out_put;
2668 }
2669
2670 data->args.fh = NFS_FH(inode);
2671 data->args.inode = inode;
2672 status = ld->prepare_layoutstats(&data->args);
2673 if (status)
2674 goto out_free;
2675
2676 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2677
2678out:
2679 dprintk("%s returns %d\n", __func__, status);
2680 return status;
2681
2682out_free:
2683 kfree(data);
2684out_put:
2685 pnfs_put_layout_hdr(hdr);
2686out_clear_layoutstats:
2687 smp_mb__before_atomic();
2688 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2689 smp_mb__after_atomic();
2690 goto out;
2691}
2692EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2693#endif
2694
2695unsigned int layoutstats_timer;
2696module_param(layoutstats_timer, uint, 0644);
2697EXPORT_SYMBOL_GPL(layoutstats_timer);