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