?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ARM: pmu: add support for interrupt-affinity property
[linux/fpc-iii.git] / fs / nfs / pnfs.c
blob4f802b02fbb9b0c6fc61912be044f6cef94acd32
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 "internal.h"
34 #include "pnfs.h"
35 #include "iostat.h"
36 #include "nfs4trace.h"
37 #include "delegation.h"
38
39 #define NFSDBG_FACILITY NFSDBG_PNFS
40 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
41
42 /* Locking:
43 *
44 * pnfs_spinlock:
45 * protects pnfs_modules_tbl.
46 */
47 static DEFINE_SPINLOCK(pnfs_spinlock);
48
49 /*
50 * pnfs_modules_tbl holds all pnfs modules
51 */
52 static LIST_HEAD(pnfs_modules_tbl);
53
54 static int
55 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
56 enum pnfs_iomode iomode, bool sync);
57
58 /* Return the registered pnfs layout driver module matching given id */
59 static struct pnfs_layoutdriver_type *
60 find_pnfs_driver_locked(u32 id)
61 {
62 struct pnfs_layoutdriver_type *local;
63
64 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
65 if (local->id == id)
66 goto out;
67 local = NULL;
68 out:
69 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
70 return local;
71 }
72
73 static struct pnfs_layoutdriver_type *
74 find_pnfs_driver(u32 id)
75 {
76 struct pnfs_layoutdriver_type *local;
77
78 spin_lock(&pnfs_spinlock);
79 local = find_pnfs_driver_locked(id);
80 if (local != NULL && !try_module_get(local->owner)) {
81 dprintk("%s: Could not grab reference on module\n", __func__);
82 local = NULL;
83 }
84 spin_unlock(&pnfs_spinlock);
85 return local;
86 }
87
88 void
89 unset_pnfs_layoutdriver(struct nfs_server *nfss)
90 {
91 if (nfss->pnfs_curr_ld) {
92 if (nfss->pnfs_curr_ld->clear_layoutdriver)
93 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
94 /* Decrement the MDS count. Purge the deviceid cache if zero */
95 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
96 nfs4_deviceid_purge_client(nfss->nfs_client);
97 module_put(nfss->pnfs_curr_ld->owner);
98 }
99 nfss->pnfs_curr_ld = NULL;
100 }
101
102 /*
103 * Try to set the server's pnfs module to the pnfs layout type specified by id.
104 * Currently only one pNFS layout driver per filesystem is supported.
105 *
106 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
107 */
108 void
109 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
110 u32 id)
111 {
112 struct pnfs_layoutdriver_type *ld_type = NULL;
113
114 if (id == 0)
115 goto out_no_driver;
116 if (!(server->nfs_client->cl_exchange_flags &
117 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
118 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
119 __func__, id, server->nfs_client->cl_exchange_flags);
120 goto out_no_driver;
121 }
122 ld_type = find_pnfs_driver(id);
123 if (!ld_type) {
124 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
125 ld_type = find_pnfs_driver(id);
126 if (!ld_type) {
127 dprintk("%s: No pNFS module found for %u.\n",
128 __func__, id);
129 goto out_no_driver;
130 }
131 }
132 server->pnfs_curr_ld = ld_type;
133 if (ld_type->set_layoutdriver
134 && ld_type->set_layoutdriver(server, mntfh)) {
135 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
136 "driver %u.\n", __func__, id);
137 module_put(ld_type->owner);
138 goto out_no_driver;
139 }
140 /* Bump the MDS count */
141 atomic_inc(&server->nfs_client->cl_mds_count);
142
143 dprintk("%s: pNFS module for %u set\n", __func__, id);
144 return;
145
146 out_no_driver:
147 dprintk("%s: Using NFSv4 I/O\n", __func__);
148 server->pnfs_curr_ld = NULL;
149 }
150
151 int
152 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
153 {
154 int status = -EINVAL;
155 struct pnfs_layoutdriver_type *tmp;
156
157 if (ld_type->id == 0) {
158 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
159 return status;
160 }
161 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
162 printk(KERN_ERR "NFS: %s Layout driver must provide "
163 "alloc_lseg and free_lseg.\n", __func__);
164 return status;
165 }
166
167 spin_lock(&pnfs_spinlock);
168 tmp = find_pnfs_driver_locked(ld_type->id);
169 if (!tmp) {
170 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
171 status = 0;
172 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
173 ld_type->name);
174 } else {
175 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
176 __func__, ld_type->id);
177 }
178 spin_unlock(&pnfs_spinlock);
179
180 return status;
181 }
182 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
183
184 void
185 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
186 {
187 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
188 spin_lock(&pnfs_spinlock);
189 list_del(&ld_type->pnfs_tblid);
190 spin_unlock(&pnfs_spinlock);
191 }
192 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
193
194 /*
195 * pNFS client layout cache
196 */
197
198 /* Need to hold i_lock if caller does not already hold reference */
199 void
200 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
201 {
202 atomic_inc(&lo->plh_refcount);
203 }
204
205 static struct pnfs_layout_hdr *
206 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
207 {
208 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
209 return ld->alloc_layout_hdr(ino, gfp_flags);
210 }
211
212 static void
213 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
214 {
215 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
216 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
217
218 if (!list_empty(&lo->plh_layouts)) {
219 struct nfs_client *clp = server->nfs_client;
220
221 spin_lock(&clp->cl_lock);
222 list_del_init(&lo->plh_layouts);
223 spin_unlock(&clp->cl_lock);
224 }
225 put_rpccred(lo->plh_lc_cred);
226 return ld->free_layout_hdr(lo);
227 }
228
229 static void
230 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
231 {
232 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
233 dprintk("%s: freeing layout cache %p\n", __func__, lo);
234 nfsi->layout = NULL;
235 /* Reset MDS Threshold I/O counters */
236 nfsi->write_io = 0;
237 nfsi->read_io = 0;
238 }
239
240 void
241 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
242 {
243 struct inode *inode = lo->plh_inode;
244
245 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
246 if (!list_empty(&lo->plh_segs))
247 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
248 pnfs_detach_layout_hdr(lo);
249 spin_unlock(&inode->i_lock);
250 pnfs_free_layout_hdr(lo);
251 }
252 }
253
254 static int
255 pnfs_iomode_to_fail_bit(u32 iomode)
256 {
257 return iomode == IOMODE_RW ?
258 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
259 }
260
261 static void
262 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
263 {
264 lo->plh_retry_timestamp = jiffies;
265 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
266 atomic_inc(&lo->plh_refcount);
267 }
268
269 static void
270 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
271 {
272 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
273 atomic_dec(&lo->plh_refcount);
274 }
275
276 static void
277 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
278 {
279 struct inode *inode = lo->plh_inode;
280 struct pnfs_layout_range range = {
281 .iomode = iomode,
282 .offset = 0,
283 .length = NFS4_MAX_UINT64,
284 };
285 LIST_HEAD(head);
286
287 spin_lock(&inode->i_lock);
288 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
289 pnfs_mark_matching_lsegs_invalid(lo, &head, &range);
290 spin_unlock(&inode->i_lock);
291 pnfs_free_lseg_list(&head);
292 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
293 iomode == IOMODE_RW ? "RW" : "READ");
294 }
295
296 static bool
297 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
298 {
299 unsigned long start, end;
300 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
301
302 if (test_bit(fail_bit, &lo->plh_flags) == 0)
303 return false;
304 end = jiffies;
305 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
306 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
307 /* It is time to retry the failed layoutgets */
308 pnfs_layout_clear_fail_bit(lo, fail_bit);
309 return false;
310 }
311 return true;
312 }
313
314 static void
315 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
316 {
317 INIT_LIST_HEAD(&lseg->pls_list);
318 INIT_LIST_HEAD(&lseg->pls_lc_list);
319 atomic_set(&lseg->pls_refcount, 1);
320 smp_mb();
321 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
322 lseg->pls_layout = lo;
323 }
324
325 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
326 {
327 struct inode *ino = lseg->pls_layout->plh_inode;
328
329 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
330 }
331
332 static void
333 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
334 struct pnfs_layout_segment *lseg)
335 {
336 struct inode *inode = lo->plh_inode;
337
338 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
339 list_del_init(&lseg->pls_list);
340 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
341 atomic_dec(&lo->plh_refcount);
342 if (list_empty(&lo->plh_segs))
343 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
344 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
345 }
346
347 /* Return true if layoutreturn is needed */
348 static bool
349 pnfs_layout_need_return(struct pnfs_layout_hdr *lo,
350 struct pnfs_layout_segment *lseg)
351 {
352 struct pnfs_layout_segment *s;
353
354 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
355 return false;
356
357 list_for_each_entry(s, &lo->plh_segs, pls_list)
358 if (s != lseg && test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
359 return false;
360
361 return true;
362 }
363
364 static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment *lseg,
365 struct pnfs_layout_hdr *lo, struct inode *inode)
366 {
367 lo = lseg->pls_layout;
368 inode = lo->plh_inode;
369
370 spin_lock(&inode->i_lock);
371 if (pnfs_layout_need_return(lo, lseg)) {
372 nfs4_stateid stateid;
373 enum pnfs_iomode iomode;
374
375 stateid = lo->plh_stateid;
376 iomode = lo->plh_return_iomode;
377 /* decreased in pnfs_send_layoutreturn() */
378 lo->plh_block_lgets++;
379 lo->plh_return_iomode = 0;
380 spin_unlock(&inode->i_lock);
381 pnfs_get_layout_hdr(lo);
382
383 /* Send an async layoutreturn so we dont deadlock */
384 pnfs_send_layoutreturn(lo, stateid, iomode, false);
385 } else
386 spin_unlock(&inode->i_lock);
387 }
388
389 void
390 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
391 {
392 struct pnfs_layout_hdr *lo;
393 struct inode *inode;
394
395 if (!lseg)
396 return;
397
398 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
399 atomic_read(&lseg->pls_refcount),
400 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
401
402 /* Handle the case where refcount != 1 */
403 if (atomic_add_unless(&lseg->pls_refcount, -1, 1))
404 return;
405
406 lo = lseg->pls_layout;
407 inode = lo->plh_inode;
408 /* Do we need a layoutreturn? */
409 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
410 pnfs_layoutreturn_before_put_lseg(lseg, lo, inode);
411
412 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
413 pnfs_get_layout_hdr(lo);
414 pnfs_layout_remove_lseg(lo, lseg);
415 spin_unlock(&inode->i_lock);
416 pnfs_free_lseg(lseg);
417 pnfs_put_layout_hdr(lo);
418 }
419 }
420 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
421
422 static void pnfs_free_lseg_async_work(struct work_struct *work)
423 {
424 struct pnfs_layout_segment *lseg;
425 struct pnfs_layout_hdr *lo;
426
427 lseg = container_of(work, struct pnfs_layout_segment, pls_work);
428 lo = lseg->pls_layout;
429
430 pnfs_free_lseg(lseg);
431 pnfs_put_layout_hdr(lo);
432 }
433
434 static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
435 {
436 INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
437 schedule_work(&lseg->pls_work);
438 }
439
440 void
441 pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
442 {
443 if (!lseg)
444 return;
445
446 assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
447
448 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
449 atomic_read(&lseg->pls_refcount),
450 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
451 if (atomic_dec_and_test(&lseg->pls_refcount)) {
452 struct pnfs_layout_hdr *lo = lseg->pls_layout;
453 pnfs_get_layout_hdr(lo);
454 pnfs_layout_remove_lseg(lo, lseg);
455 pnfs_free_lseg_async(lseg);
456 }
457 }
458 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
459
460 static u64
461 end_offset(u64 start, u64 len)
462 {
463 u64 end;
464
465 end = start + len;
466 return end >= start ? end : NFS4_MAX_UINT64;
467 }
468
469 /*
470 * is l2 fully contained in l1?
471 * start1 end1
472 * [----------------------------------)
473 * start2 end2
474 * [----------------)
475 */
476 static bool
477 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
478 const struct pnfs_layout_range *l2)
479 {
480 u64 start1 = l1->offset;
481 u64 end1 = end_offset(start1, l1->length);
482 u64 start2 = l2->offset;
483 u64 end2 = end_offset(start2, l2->length);
484
485 return (start1 <= start2) && (end1 >= end2);
486 }
487
488 /*
489 * is l1 and l2 intersecting?
490 * start1 end1
491 * [----------------------------------)
492 * start2 end2
493 * [----------------)
494 */
495 static bool
496 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
497 const struct pnfs_layout_range *l2)
498 {
499 u64 start1 = l1->offset;
500 u64 end1 = end_offset(start1, l1->length);
501 u64 start2 = l2->offset;
502 u64 end2 = end_offset(start2, l2->length);
503
504 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
505 (end2 == NFS4_MAX_UINT64 || end2 > start1);
506 }
507
508 static bool
509 should_free_lseg(const struct pnfs_layout_range *lseg_range,
510 const struct pnfs_layout_range *recall_range)
511 {
512 return (recall_range->iomode == IOMODE_ANY ||
513 lseg_range->iomode == recall_range->iomode) &&
514 pnfs_lseg_range_intersecting(lseg_range, recall_range);
515 }
516
517 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
518 struct list_head *tmp_list)
519 {
520 if (!atomic_dec_and_test(&lseg->pls_refcount))
521 return false;
522 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
523 list_add(&lseg->pls_list, tmp_list);
524 return true;
525 }
526
527 /* Returns 1 if lseg is removed from list, 0 otherwise */
528 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
529 struct list_head *tmp_list)
530 {
531 int rv = 0;
532
533 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
534 /* Remove the reference keeping the lseg in the
535 * list. It will now be removed when all
536 * outstanding io is finished.
537 */
538 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
539 atomic_read(&lseg->pls_refcount));
540 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
541 rv = 1;
542 }
543 return rv;
544 }
545
546 /* Returns count of number of matching invalid lsegs remaining in list
547 * after call.
548 */
549 int
550 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
551 struct list_head *tmp_list,
552 struct pnfs_layout_range *recall_range)
553 {
554 struct pnfs_layout_segment *lseg, *next;
555 int invalid = 0, removed = 0;
556
557 dprintk("%s:Begin lo %p\n", __func__, lo);
558
559 if (list_empty(&lo->plh_segs))
560 return 0;
561 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
562 if (!recall_range ||
563 should_free_lseg(&lseg->pls_range, recall_range)) {
564 dprintk("%s: freeing lseg %p iomode %d "
565 "offset %llu length %llu\n", __func__,
566 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
567 lseg->pls_range.length);
568 invalid++;
569 removed += mark_lseg_invalid(lseg, tmp_list);
570 }
571 dprintk("%s:Return %i\n", __func__, invalid - removed);
572 return invalid - removed;
573 }
574
575 /* note free_me must contain lsegs from a single layout_hdr */
576 void
577 pnfs_free_lseg_list(struct list_head *free_me)
578 {
579 struct pnfs_layout_segment *lseg, *tmp;
580
581 if (list_empty(free_me))
582 return;
583
584 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
585 list_del(&lseg->pls_list);
586 pnfs_free_lseg(lseg);
587 }
588 }
589
590 void
591 pnfs_destroy_layout(struct nfs_inode *nfsi)
592 {
593 struct pnfs_layout_hdr *lo;
594 LIST_HEAD(tmp_list);
595
596 spin_lock(&nfsi->vfs_inode.i_lock);
597 lo = nfsi->layout;
598 if (lo) {
599 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
600 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
601 pnfs_get_layout_hdr(lo);
602 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
603 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
604 pnfs_clear_retry_layoutget(lo);
605 spin_unlock(&nfsi->vfs_inode.i_lock);
606 pnfs_free_lseg_list(&tmp_list);
607 pnfs_put_layout_hdr(lo);
608 } else
609 spin_unlock(&nfsi->vfs_inode.i_lock);
610 }
611 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
612
613 static bool
614 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
615 struct list_head *layout_list)
616 {
617 struct pnfs_layout_hdr *lo;
618 bool ret = false;
619
620 spin_lock(&inode->i_lock);
621 lo = NFS_I(inode)->layout;
622 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
623 pnfs_get_layout_hdr(lo);
624 list_add(&lo->plh_bulk_destroy, layout_list);
625 ret = true;
626 }
627 spin_unlock(&inode->i_lock);
628 return ret;
629 }
630
631 /* Caller must hold rcu_read_lock and clp->cl_lock */
632 static int
633 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
634 struct nfs_server *server,
635 struct list_head *layout_list)
636 {
637 struct pnfs_layout_hdr *lo, *next;
638 struct inode *inode;
639
640 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
641 inode = igrab(lo->plh_inode);
642 if (inode == NULL)
643 continue;
644 list_del_init(&lo->plh_layouts);
645 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
646 continue;
647 rcu_read_unlock();
648 spin_unlock(&clp->cl_lock);
649 iput(inode);
650 spin_lock(&clp->cl_lock);
651 rcu_read_lock();
652 return -EAGAIN;
653 }
654 return 0;
655 }
656
657 static int
658 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
659 bool is_bulk_recall)
660 {
661 struct pnfs_layout_hdr *lo;
662 struct inode *inode;
663 struct pnfs_layout_range range = {
664 .iomode = IOMODE_ANY,
665 .offset = 0,
666 .length = NFS4_MAX_UINT64,
667 };
668 LIST_HEAD(lseg_list);
669 int ret = 0;
670
671 while (!list_empty(layout_list)) {
672 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
673 plh_bulk_destroy);
674 dprintk("%s freeing layout for inode %lu\n", __func__,
675 lo->plh_inode->i_ino);
676 inode = lo->plh_inode;
677
678 pnfs_layoutcommit_inode(inode, false);
679
680 spin_lock(&inode->i_lock);
681 list_del_init(&lo->plh_bulk_destroy);
682 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
683 if (is_bulk_recall)
684 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
685 if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range))
686 ret = -EAGAIN;
687 spin_unlock(&inode->i_lock);
688 pnfs_free_lseg_list(&lseg_list);
689 pnfs_put_layout_hdr(lo);
690 iput(inode);
691 }
692 return ret;
693 }
694
695 int
696 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
697 struct nfs_fsid *fsid,
698 bool is_recall)
699 {
700 struct nfs_server *server;
701 LIST_HEAD(layout_list);
702
703 spin_lock(&clp->cl_lock);
704 rcu_read_lock();
705 restart:
706 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
707 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
708 continue;
709 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
710 server,
711 &layout_list) != 0)
712 goto restart;
713 }
714 rcu_read_unlock();
715 spin_unlock(&clp->cl_lock);
716
717 if (list_empty(&layout_list))
718 return 0;
719 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
720 }
721
722 int
723 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
724 bool is_recall)
725 {
726 struct nfs_server *server;
727 LIST_HEAD(layout_list);
728
729 spin_lock(&clp->cl_lock);
730 rcu_read_lock();
731 restart:
732 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
733 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
734 server,
735 &layout_list) != 0)
736 goto restart;
737 }
738 rcu_read_unlock();
739 spin_unlock(&clp->cl_lock);
740
741 if (list_empty(&layout_list))
742 return 0;
743 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
744 }
745
746 /*
747 * Called by the state manger to remove all layouts established under an
748 * expired lease.
749 */
750 void
751 pnfs_destroy_all_layouts(struct nfs_client *clp)
752 {
753 nfs4_deviceid_mark_client_invalid(clp);
754 nfs4_deviceid_purge_client(clp);
755
756 pnfs_destroy_layouts_byclid(clp, false);
757 }
758
759 /*
760 * Compare 2 layout stateid sequence ids, to see which is newer,
761 * taking into account wraparound issues.
762 */
763 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
764 {
765 return (s32)(s1 - s2) > 0;
766 }
767
768 /* update lo->plh_stateid with new if is more recent */
769 void
770 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
771 bool update_barrier)
772 {
773 u32 oldseq, newseq, new_barrier;
774 int empty = list_empty(&lo->plh_segs);
775
776 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
777 newseq = be32_to_cpu(new->seqid);
778 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
779 nfs4_stateid_copy(&lo->plh_stateid, new);
780 if (update_barrier) {
781 new_barrier = be32_to_cpu(new->seqid);
782 } else {
783 /* Because of wraparound, we want to keep the barrier
784 * "close" to the current seqids.
785 */
786 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
787 }
788 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
789 lo->plh_barrier = new_barrier;
790 }
791 }
792
793 static bool
794 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
795 const nfs4_stateid *stateid)
796 {
797 u32 seqid = be32_to_cpu(stateid->seqid);
798
799 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
800 }
801
802 static bool
803 pnfs_layout_returning(const struct pnfs_layout_hdr *lo,
804 struct pnfs_layout_range *range)
805 {
806 return test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) &&
807 (lo->plh_return_iomode == IOMODE_ANY ||
808 lo->plh_return_iomode == range->iomode);
809 }
810
811 /* lget is set to 1 if called from inside send_layoutget call chain */
812 static bool
813 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo,
814 struct pnfs_layout_range *range, int lget)
815 {
816 return lo->plh_block_lgets ||
817 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
818 (list_empty(&lo->plh_segs) &&
819 (atomic_read(&lo->plh_outstanding) > lget)) ||
820 pnfs_layout_returning(lo, range);
821 }
822
823 int
824 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
825 struct pnfs_layout_range *range,
826 struct nfs4_state *open_state)
827 {
828 int status = 0;
829
830 dprintk("--> %s\n", __func__);
831 spin_lock(&lo->plh_inode->i_lock);
832 if (pnfs_layoutgets_blocked(lo, range, 1)) {
833 status = -EAGAIN;
834 } else if (!nfs4_valid_open_stateid(open_state)) {
835 status = -EBADF;
836 } else if (list_empty(&lo->plh_segs) ||
837 test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
838 int seq;
839
840 do {
841 seq = read_seqbegin(&open_state->seqlock);
842 nfs4_stateid_copy(dst, &open_state->stateid);
843 } while (read_seqretry(&open_state->seqlock, seq));
844 } else
845 nfs4_stateid_copy(dst, &lo->plh_stateid);
846 spin_unlock(&lo->plh_inode->i_lock);
847 dprintk("<-- %s\n", __func__);
848 return status;
849 }
850
851 /*
852 * Get layout from server.
853 * for now, assume that whole file layouts are requested.
854 * arg->offset: 0
855 * arg->length: all ones
856 */
857 static struct pnfs_layout_segment *
858 send_layoutget(struct pnfs_layout_hdr *lo,
859 struct nfs_open_context *ctx,
860 struct pnfs_layout_range *range,
861 gfp_t gfp_flags)
862 {
863 struct inode *ino = lo->plh_inode;
864 struct nfs_server *server = NFS_SERVER(ino);
865 struct nfs4_layoutget *lgp;
866 struct pnfs_layout_segment *lseg;
867
868 dprintk("--> %s\n", __func__);
869
870 lgp = kzalloc(sizeof(*lgp), gfp_flags);
871 if (lgp == NULL)
872 return NULL;
873
874 lgp->args.minlength = PAGE_CACHE_SIZE;
875 if (lgp->args.minlength > range->length)
876 lgp->args.minlength = range->length;
877 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
878 lgp->args.range = *range;
879 lgp->args.type = server->pnfs_curr_ld->id;
880 lgp->args.inode = ino;
881 lgp->args.ctx = get_nfs_open_context(ctx);
882 lgp->gfp_flags = gfp_flags;
883 lgp->cred = lo->plh_lc_cred;
884
885 /* Synchronously retrieve layout information from server and
886 * store in lseg.
887 */
888 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
889 if (IS_ERR(lseg)) {
890 switch (PTR_ERR(lseg)) {
891 case -ENOMEM:
892 case -ERESTARTSYS:
893 break;
894 default:
895 /* remember that LAYOUTGET failed and suspend trying */
896 pnfs_layout_io_set_failed(lo, range->iomode);
897 }
898 return NULL;
899 } else
900 pnfs_layout_clear_fail_bit(lo,
901 pnfs_iomode_to_fail_bit(range->iomode));
902
903 return lseg;
904 }
905
906 static void pnfs_clear_layoutcommit(struct inode *inode,
907 struct list_head *head)
908 {
909 struct nfs_inode *nfsi = NFS_I(inode);
910 struct pnfs_layout_segment *lseg, *tmp;
911
912 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
913 return;
914 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
915 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
916 continue;
917 pnfs_lseg_dec_and_remove_zero(lseg, head);
918 }
919 }
920
921 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
922 {
923 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
924 smp_mb__after_atomic();
925 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
926 }
927
928 static int
929 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
930 enum pnfs_iomode iomode, bool sync)
931 {
932 struct inode *ino = lo->plh_inode;
933 struct nfs4_layoutreturn *lrp;
934 int status = 0;
935
936 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
937 if (unlikely(lrp == NULL)) {
938 status = -ENOMEM;
939 spin_lock(&ino->i_lock);
940 lo->plh_block_lgets--;
941 pnfs_clear_layoutreturn_waitbit(lo);
942 rpc_wake_up(&NFS_SERVER(ino)->roc_rpcwaitq);
943 spin_unlock(&ino->i_lock);
944 pnfs_put_layout_hdr(lo);
945 goto out;
946 }
947
948 lrp->args.stateid = stateid;
949 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
950 lrp->args.inode = ino;
951 lrp->args.range.iomode = iomode;
952 lrp->args.range.offset = 0;
953 lrp->args.range.length = NFS4_MAX_UINT64;
954 lrp->args.layout = lo;
955 lrp->clp = NFS_SERVER(ino)->nfs_client;
956 lrp->cred = lo->plh_lc_cred;
957
958 status = nfs4_proc_layoutreturn(lrp, sync);
959 out:
960 dprintk("<-- %s status: %d\n", __func__, status);
961 return status;
962 }
963
964 /*
965 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
966 * when the layout segment list is empty.
967 *
968 * Note that a pnfs_layout_hdr can exist with an empty layout segment
969 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
970 * deviceid is marked invalid.
971 */
972 int
973 _pnfs_return_layout(struct inode *ino)
974 {
975 struct pnfs_layout_hdr *lo = NULL;
976 struct nfs_inode *nfsi = NFS_I(ino);
977 LIST_HEAD(tmp_list);
978 nfs4_stateid stateid;
979 int status = 0, empty;
980
981 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
982
983 spin_lock(&ino->i_lock);
984 lo = nfsi->layout;
985 if (!lo) {
986 spin_unlock(&ino->i_lock);
987 dprintk("NFS: %s no layout to return\n", __func__);
988 goto out;
989 }
990 stateid = nfsi->layout->plh_stateid;
991 /* Reference matched in nfs4_layoutreturn_release */
992 pnfs_get_layout_hdr(lo);
993 empty = list_empty(&lo->plh_segs);
994 pnfs_clear_layoutcommit(ino, &tmp_list);
995 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
996
997 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
998 struct pnfs_layout_range range = {
999 .iomode = IOMODE_ANY,
1000 .offset = 0,
1001 .length = NFS4_MAX_UINT64,
1002 };
1003 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1004 }
1005
1006 /* Don't send a LAYOUTRETURN if list was initially empty */
1007 if (empty) {
1008 spin_unlock(&ino->i_lock);
1009 pnfs_put_layout_hdr(lo);
1010 dprintk("NFS: %s no layout segments to return\n", __func__);
1011 goto out;
1012 }
1013
1014 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1015 lo->plh_block_lgets++;
1016 spin_unlock(&ino->i_lock);
1017 pnfs_free_lseg_list(&tmp_list);
1018
1019 status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
1020 out:
1021 dprintk("<-- %s status: %d\n", __func__, status);
1022 return status;
1023 }
1024 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
1025
1026 int
1027 pnfs_commit_and_return_layout(struct inode *inode)
1028 {
1029 struct pnfs_layout_hdr *lo;
1030 int ret;
1031
1032 spin_lock(&inode->i_lock);
1033 lo = NFS_I(inode)->layout;
1034 if (lo == NULL) {
1035 spin_unlock(&inode->i_lock);
1036 return 0;
1037 }
1038 pnfs_get_layout_hdr(lo);
1039 /* Block new layoutgets and read/write to ds */
1040 lo->plh_block_lgets++;
1041 spin_unlock(&inode->i_lock);
1042 filemap_fdatawait(inode->i_mapping);
1043 ret = pnfs_layoutcommit_inode(inode, true);
1044 if (ret == 0)
1045 ret = _pnfs_return_layout(inode);
1046 spin_lock(&inode->i_lock);
1047 lo->plh_block_lgets--;
1048 spin_unlock(&inode->i_lock);
1049 pnfs_put_layout_hdr(lo);
1050 return ret;
1051 }
1052
1053 bool pnfs_roc(struct inode *ino)
1054 {
1055 struct nfs_inode *nfsi = NFS_I(ino);
1056 struct nfs_open_context *ctx;
1057 struct nfs4_state *state;
1058 struct pnfs_layout_hdr *lo;
1059 struct pnfs_layout_segment *lseg, *tmp;
1060 nfs4_stateid stateid;
1061 LIST_HEAD(tmp_list);
1062 bool found = false, layoutreturn = false;
1063
1064 spin_lock(&ino->i_lock);
1065 lo = nfsi->layout;
1066 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
1067 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1068 goto out_noroc;
1069
1070 /* Don't return layout if we hold a delegation */
1071 if (nfs4_check_delegation(ino, FMODE_READ))
1072 goto out_noroc;
1073
1074 list_for_each_entry(ctx, &nfsi->open_files, list) {
1075 state = ctx->state;
1076 /* Don't return layout if there is open file state */
1077 if (state != NULL && state->state != 0)
1078 goto out_noroc;
1079 }
1080
1081 pnfs_clear_retry_layoutget(lo);
1082 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1083 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
1084 mark_lseg_invalid(lseg, &tmp_list);
1085 found = true;
1086 }
1087 if (!found)
1088 goto out_noroc;
1089 lo->plh_block_lgets++;
1090 pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */
1091 spin_unlock(&ino->i_lock);
1092 pnfs_free_lseg_list(&tmp_list);
1093 return true;
1094
1095 out_noroc:
1096 if (lo) {
1097 stateid = lo->plh_stateid;
1098 layoutreturn =
1099 test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1100 &lo->plh_flags);
1101 if (layoutreturn) {
1102 lo->plh_block_lgets++;
1103 pnfs_get_layout_hdr(lo);
1104 }
1105 }
1106 spin_unlock(&ino->i_lock);
1107 if (layoutreturn)
1108 pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
1109 return false;
1110 }
1111
1112 void pnfs_roc_release(struct inode *ino)
1113 {
1114 struct pnfs_layout_hdr *lo;
1115
1116 spin_lock(&ino->i_lock);
1117 lo = NFS_I(ino)->layout;
1118 lo->plh_block_lgets--;
1119 if (atomic_dec_and_test(&lo->plh_refcount)) {
1120 pnfs_detach_layout_hdr(lo);
1121 spin_unlock(&ino->i_lock);
1122 pnfs_free_layout_hdr(lo);
1123 } else
1124 spin_unlock(&ino->i_lock);
1125 }
1126
1127 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
1128 {
1129 struct pnfs_layout_hdr *lo;
1130
1131 spin_lock(&ino->i_lock);
1132 lo = NFS_I(ino)->layout;
1133 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
1134 lo->plh_barrier = barrier;
1135 spin_unlock(&ino->i_lock);
1136 }
1137
1138 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
1139 {
1140 struct nfs_inode *nfsi = NFS_I(ino);
1141 struct pnfs_layout_hdr *lo;
1142 struct pnfs_layout_segment *lseg;
1143 nfs4_stateid stateid;
1144 u32 current_seqid;
1145 bool found = false, layoutreturn = false;
1146
1147 spin_lock(&ino->i_lock);
1148 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
1149 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
1150 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1151 found = true;
1152 goto out;
1153 }
1154 lo = nfsi->layout;
1155 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
1156
1157 /* Since close does not return a layout stateid for use as
1158 * a barrier, we choose the worst-case barrier.
1159 */
1160 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
1161 out:
1162 if (!found) {
1163 stateid = lo->plh_stateid;
1164 layoutreturn =
1165 test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1166 &lo->plh_flags);
1167 if (layoutreturn) {
1168 lo->plh_block_lgets++;
1169 pnfs_get_layout_hdr(lo);
1170 }
1171 }
1172 spin_unlock(&ino->i_lock);
1173 if (layoutreturn) {
1174 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1175 pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, false);
1176 }
1177 return found;
1178 }
1179
1180 /*
1181 * Compare two layout segments for sorting into layout cache.
1182 * We want to preferentially return RW over RO layouts, so ensure those
1183 * are seen first.
1184 */
1185 static s64
1186 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1187 const struct pnfs_layout_range *l2)
1188 {
1189 s64 d;
1190
1191 /* high offset > low offset */
1192 d = l1->offset - l2->offset;
1193 if (d)
1194 return d;
1195
1196 /* short length > long length */
1197 d = l2->length - l1->length;
1198 if (d)
1199 return d;
1200
1201 /* read > read/write */
1202 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1203 }
1204
1205 static void
1206 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1207 struct pnfs_layout_segment *lseg)
1208 {
1209 struct pnfs_layout_segment *lp;
1210
1211 dprintk("%s:Begin\n", __func__);
1212
1213 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
1214 if (pnfs_lseg_range_cmp(&lseg->pls_range, &lp->pls_range) > 0)
1215 continue;
1216 list_add_tail(&lseg->pls_list, &lp->pls_list);
1217 dprintk("%s: inserted lseg %p "
1218 "iomode %d offset %llu length %llu before "
1219 "lp %p iomode %d offset %llu length %llu\n",
1220 __func__, lseg, lseg->pls_range.iomode,
1221 lseg->pls_range.offset, lseg->pls_range.length,
1222 lp, lp->pls_range.iomode, lp->pls_range.offset,
1223 lp->pls_range.length);
1224 goto out;
1225 }
1226 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1227 dprintk("%s: inserted lseg %p "
1228 "iomode %d offset %llu length %llu at tail\n",
1229 __func__, lseg, lseg->pls_range.iomode,
1230 lseg->pls_range.offset, lseg->pls_range.length);
1231 out:
1232 pnfs_get_layout_hdr(lo);
1233
1234 dprintk("%s:Return\n", __func__);
1235 }
1236
1237 static struct pnfs_layout_hdr *
1238 alloc_init_layout_hdr(struct inode *ino,
1239 struct nfs_open_context *ctx,
1240 gfp_t gfp_flags)
1241 {
1242 struct pnfs_layout_hdr *lo;
1243
1244 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1245 if (!lo)
1246 return NULL;
1247 atomic_set(&lo->plh_refcount, 1);
1248 INIT_LIST_HEAD(&lo->plh_layouts);
1249 INIT_LIST_HEAD(&lo->plh_segs);
1250 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1251 lo->plh_inode = ino;
1252 lo->plh_lc_cred = get_rpccred(ctx->cred);
1253 return lo;
1254 }
1255
1256 static struct pnfs_layout_hdr *
1257 pnfs_find_alloc_layout(struct inode *ino,
1258 struct nfs_open_context *ctx,
1259 gfp_t gfp_flags)
1260 {
1261 struct nfs_inode *nfsi = NFS_I(ino);
1262 struct pnfs_layout_hdr *new = NULL;
1263
1264 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1265
1266 if (nfsi->layout != NULL)
1267 goto out_existing;
1268 spin_unlock(&ino->i_lock);
1269 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1270 spin_lock(&ino->i_lock);
1271
1272 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1273 nfsi->layout = new;
1274 return new;
1275 } else if (new != NULL)
1276 pnfs_free_layout_hdr(new);
1277 out_existing:
1278 pnfs_get_layout_hdr(nfsi->layout);
1279 return nfsi->layout;
1280 }
1281
1282 /*
1283 * iomode matching rules:
1284 * iomode lseg match
1285 * ----- ----- -----
1286 * ANY READ true
1287 * ANY RW true
1288 * RW READ false
1289 * RW RW true
1290 * READ READ true
1291 * READ RW true
1292 */
1293 static bool
1294 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1295 const struct pnfs_layout_range *range)
1296 {
1297 struct pnfs_layout_range range1;
1298
1299 if ((range->iomode == IOMODE_RW &&
1300 ls_range->iomode != IOMODE_RW) ||
1301 !pnfs_lseg_range_intersecting(ls_range, range))
1302 return 0;
1303
1304 /* range1 covers only the first byte in the range */
1305 range1 = *range;
1306 range1.length = 1;
1307 return pnfs_lseg_range_contained(ls_range, &range1);
1308 }
1309
1310 /*
1311 * lookup range in layout
1312 */
1313 static struct pnfs_layout_segment *
1314 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1315 struct pnfs_layout_range *range)
1316 {
1317 struct pnfs_layout_segment *lseg, *ret = NULL;
1318
1319 dprintk("%s:Begin\n", __func__);
1320
1321 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1322 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1323 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1324 pnfs_lseg_range_match(&lseg->pls_range, range)) {
1325 ret = pnfs_get_lseg(lseg);
1326 break;
1327 }
1328 if (lseg->pls_range.offset > range->offset)
1329 break;
1330 }
1331
1332 dprintk("%s:Return lseg %p ref %d\n",
1333 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1334 return ret;
1335 }
1336
1337 /*
1338 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1339 * to the MDS or over pNFS
1340 *
1341 * The nfs_inode read_io and write_io fields are cumulative counters reset
1342 * when there are no layout segments. Note that in pnfs_update_layout iomode
1343 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1344 * WRITE request.
1345 *
1346 * A return of true means use MDS I/O.
1347 *
1348 * From rfc 5661:
1349 * If a file's size is smaller than the file size threshold, data accesses
1350 * SHOULD be sent to the metadata server. If an I/O request has a length that
1351 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1352 * server. If both file size and I/O size are provided, the client SHOULD
1353 * reach or exceed both thresholds before sending its read or write
1354 * requests to the data server.
1355 */
1356 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1357 struct inode *ino, int iomode)
1358 {
1359 struct nfs4_threshold *t = ctx->mdsthreshold;
1360 struct nfs_inode *nfsi = NFS_I(ino);
1361 loff_t fsize = i_size_read(ino);
1362 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1363
1364 if (t == NULL)
1365 return ret;
1366
1367 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1368 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1369
1370 switch (iomode) {
1371 case IOMODE_READ:
1372 if (t->bm & THRESHOLD_RD) {
1373 dprintk("%s fsize %llu\n", __func__, fsize);
1374 size_set = true;
1375 if (fsize < t->rd_sz)
1376 size = true;
1377 }
1378 if (t->bm & THRESHOLD_RD_IO) {
1379 dprintk("%s nfsi->read_io %llu\n", __func__,
1380 nfsi->read_io);
1381 io_set = true;
1382 if (nfsi->read_io < t->rd_io_sz)
1383 io = true;
1384 }
1385 break;
1386 case IOMODE_RW:
1387 if (t->bm & THRESHOLD_WR) {
1388 dprintk("%s fsize %llu\n", __func__, fsize);
1389 size_set = true;
1390 if (fsize < t->wr_sz)
1391 size = true;
1392 }
1393 if (t->bm & THRESHOLD_WR_IO) {
1394 dprintk("%s nfsi->write_io %llu\n", __func__,
1395 nfsi->write_io);
1396 io_set = true;
1397 if (nfsi->write_io < t->wr_io_sz)
1398 io = true;
1399 }
1400 break;
1401 }
1402 if (size_set && io_set) {
1403 if (size && io)
1404 ret = true;
1405 } else if (size || io)
1406 ret = true;
1407
1408 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1409 return ret;
1410 }
1411
1412 /* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
1413 static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key)
1414 {
1415 if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags))
1416 return 1;
1417 return nfs_wait_bit_killable(key);
1418 }
1419
1420 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1421 {
1422 /*
1423 * send layoutcommit as it can hold up layoutreturn due to lseg
1424 * reference
1425 */
1426 pnfs_layoutcommit_inode(lo->plh_inode, false);
1427 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1428 pnfs_layoutget_retry_bit_wait,
1429 TASK_UNINTERRUPTIBLE);
1430 }
1431
1432 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1433 {
1434 unsigned long *bitlock = &lo->plh_flags;
1435
1436 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1437 smp_mb__after_atomic();
1438 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1439 }
1440
1441 /*
1442 * Layout segment is retreived from the server if not cached.
1443 * The appropriate layout segment is referenced and returned to the caller.
1444 */
1445 struct pnfs_layout_segment *
1446 pnfs_update_layout(struct inode *ino,
1447 struct nfs_open_context *ctx,
1448 loff_t pos,
1449 u64 count,
1450 enum pnfs_iomode iomode,
1451 gfp_t gfp_flags)
1452 {
1453 struct pnfs_layout_range arg = {
1454 .iomode = iomode,
1455 .offset = pos,
1456 .length = count,
1457 };
1458 unsigned pg_offset;
1459 struct nfs_server *server = NFS_SERVER(ino);
1460 struct nfs_client *clp = server->nfs_client;
1461 struct pnfs_layout_hdr *lo;
1462 struct pnfs_layout_segment *lseg = NULL;
1463 bool first;
1464
1465 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
1466 goto out;
1467
1468 if (pnfs_within_mdsthreshold(ctx, ino, iomode))
1469 goto out;
1470
1471 lookup_again:
1472 first = false;
1473 spin_lock(&ino->i_lock);
1474 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1475 if (lo == NULL) {
1476 spin_unlock(&ino->i_lock);
1477 goto out;
1478 }
1479
1480 /* Do we even need to bother with this? */
1481 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1482 dprintk("%s matches recall, use MDS\n", __func__);
1483 goto out_unlock;
1484 }
1485
1486 /* if LAYOUTGET already failed once we don't try again */
1487 if (pnfs_layout_io_test_failed(lo, iomode) &&
1488 !pnfs_should_retry_layoutget(lo))
1489 goto out_unlock;
1490
1491 first = list_empty(&lo->plh_segs);
1492 if (first) {
1493 /* The first layoutget for the file. Need to serialize per
1494 * RFC 5661 Errata 3208.
1495 */
1496 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1497 &lo->plh_flags)) {
1498 spin_unlock(&ino->i_lock);
1499 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1500 TASK_UNINTERRUPTIBLE);
1501 pnfs_put_layout_hdr(lo);
1502 goto lookup_again;
1503 }
1504 } else {
1505 /* Check to see if the layout for the given range
1506 * already exists
1507 */
1508 lseg = pnfs_find_lseg(lo, &arg);
1509 if (lseg)
1510 goto out_unlock;
1511 }
1512
1513 /*
1514 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1515 * for LAYOUTRETURN even if first is true.
1516 */
1517 if (!lseg && pnfs_should_retry_layoutget(lo) &&
1518 test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1519 spin_unlock(&ino->i_lock);
1520 dprintk("%s wait for layoutreturn\n", __func__);
1521 if (pnfs_prepare_to_retry_layoutget(lo)) {
1522 if (first)
1523 pnfs_clear_first_layoutget(lo);
1524 pnfs_put_layout_hdr(lo);
1525 dprintk("%s retrying\n", __func__);
1526 goto lookup_again;
1527 }
1528 goto out_put_layout_hdr;
1529 }
1530
1531 if (pnfs_layoutgets_blocked(lo, &arg, 0))
1532 goto out_unlock;
1533 atomic_inc(&lo->plh_outstanding);
1534 spin_unlock(&ino->i_lock);
1535
1536 if (list_empty(&lo->plh_layouts)) {
1537 /* The lo must be on the clp list if there is any
1538 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1539 */
1540 spin_lock(&clp->cl_lock);
1541 if (list_empty(&lo->plh_layouts))
1542 list_add_tail(&lo->plh_layouts, &server->layouts);
1543 spin_unlock(&clp->cl_lock);
1544 }
1545
1546 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1547 if (pg_offset) {
1548 arg.offset -= pg_offset;
1549 arg.length += pg_offset;
1550 }
1551 if (arg.length != NFS4_MAX_UINT64)
1552 arg.length = PAGE_CACHE_ALIGN(arg.length);
1553
1554 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1555 pnfs_clear_retry_layoutget(lo);
1556 atomic_dec(&lo->plh_outstanding);
1557 out_put_layout_hdr:
1558 if (first)
1559 pnfs_clear_first_layoutget(lo);
1560 pnfs_put_layout_hdr(lo);
1561 out:
1562 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1563 "(%s, offset: %llu, length: %llu)\n",
1564 __func__, ino->i_sb->s_id,
1565 (unsigned long long)NFS_FILEID(ino),
1566 lseg == NULL ? "not found" : "found",
1567 iomode==IOMODE_RW ? "read/write" : "read-only",
1568 (unsigned long long)pos,
1569 (unsigned long long)count);
1570 return lseg;
1571 out_unlock:
1572 spin_unlock(&ino->i_lock);
1573 goto out_put_layout_hdr;
1574 }
1575 EXPORT_SYMBOL_GPL(pnfs_update_layout);
1576
1577 struct pnfs_layout_segment *
1578 pnfs_layout_process(struct nfs4_layoutget *lgp)
1579 {
1580 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1581 struct nfs4_layoutget_res *res = &lgp->res;
1582 struct pnfs_layout_segment *lseg;
1583 struct inode *ino = lo->plh_inode;
1584 LIST_HEAD(free_me);
1585 int status = 0;
1586
1587 /* Inject layout blob into I/O device driver */
1588 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1589 if (!lseg || IS_ERR(lseg)) {
1590 if (!lseg)
1591 status = -ENOMEM;
1592 else
1593 status = PTR_ERR(lseg);
1594 dprintk("%s: Could not allocate layout: error %d\n",
1595 __func__, status);
1596 goto out;
1597 }
1598
1599 init_lseg(lo, lseg);
1600 lseg->pls_range = res->range;
1601
1602 spin_lock(&ino->i_lock);
1603 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1604 dprintk("%s forget reply due to recall\n", __func__);
1605 goto out_forget_reply;
1606 }
1607
1608 if (pnfs_layoutgets_blocked(lo, &lgp->args.range, 1)) {
1609 dprintk("%s forget reply due to state\n", __func__);
1610 goto out_forget_reply;
1611 }
1612
1613 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1614 /* existing state ID, make sure the sequence number matches. */
1615 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1616 dprintk("%s forget reply due to sequence\n", __func__);
1617 goto out_forget_reply;
1618 }
1619 pnfs_set_layout_stateid(lo, &res->stateid, false);
1620 } else {
1621 /*
1622 * We got an entirely new state ID. Mark all segments for the
1623 * inode invalid, and don't bother validating the stateid
1624 * sequence number.
1625 */
1626 pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL);
1627
1628 nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
1629 lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
1630 }
1631
1632 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1633
1634 pnfs_get_lseg(lseg);
1635 pnfs_layout_insert_lseg(lo, lseg);
1636
1637 if (res->return_on_close) {
1638 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1639 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1640 }
1641
1642 spin_unlock(&ino->i_lock);
1643 pnfs_free_lseg_list(&free_me);
1644 return lseg;
1645 out:
1646 return ERR_PTR(status);
1647
1648 out_forget_reply:
1649 spin_unlock(&ino->i_lock);
1650 lseg->pls_layout = lo;
1651 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1652 goto out;
1653 }
1654
1655 static void
1656 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
1657 struct list_head *tmp_list,
1658 struct pnfs_layout_range *return_range)
1659 {
1660 struct pnfs_layout_segment *lseg, *next;
1661
1662 dprintk("%s:Begin lo %p\n", __func__, lo);
1663
1664 if (list_empty(&lo->plh_segs))
1665 return;
1666
1667 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
1668 if (should_free_lseg(&lseg->pls_range, return_range)) {
1669 dprintk("%s: marking lseg %p iomode %d "
1670 "offset %llu length %llu\n", __func__,
1671 lseg, lseg->pls_range.iomode,
1672 lseg->pls_range.offset,
1673 lseg->pls_range.length);
1674 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1675 mark_lseg_invalid(lseg, tmp_list);
1676 }
1677 }
1678
1679 void pnfs_error_mark_layout_for_return(struct inode *inode,
1680 struct pnfs_layout_segment *lseg)
1681 {
1682 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
1683 int iomode = pnfs_iomode_to_fail_bit(lseg->pls_range.iomode);
1684 struct pnfs_layout_range range = {
1685 .iomode = lseg->pls_range.iomode,
1686 .offset = 0,
1687 .length = NFS4_MAX_UINT64,
1688 };
1689 LIST_HEAD(free_me);
1690
1691 spin_lock(&inode->i_lock);
1692 /* set failure bit so that pnfs path will be retried later */
1693 pnfs_layout_set_fail_bit(lo, iomode);
1694 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
1695 if (lo->plh_return_iomode == 0)
1696 lo->plh_return_iomode = range.iomode;
1697 else if (lo->plh_return_iomode != range.iomode)
1698 lo->plh_return_iomode = IOMODE_ANY;
1699 /*
1700 * mark all matching lsegs so that we are sure to have no live
1701 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1702 * for how it works.
1703 */
1704 pnfs_mark_matching_lsegs_return(lo, &free_me, &range);
1705 spin_unlock(&inode->i_lock);
1706 pnfs_free_lseg_list(&free_me);
1707 }
1708 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
1709
1710 void
1711 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1712 {
1713 u64 rd_size = req->wb_bytes;
1714
1715 if (pgio->pg_lseg == NULL) {
1716 if (pgio->pg_dreq == NULL)
1717 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
1718 else
1719 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1720
1721 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1722 req->wb_context,
1723 req_offset(req),
1724 rd_size,
1725 IOMODE_READ,
1726 GFP_KERNEL);
1727 }
1728 /* If no lseg, fall back to read through mds */
1729 if (pgio->pg_lseg == NULL)
1730 nfs_pageio_reset_read_mds(pgio);
1731
1732 }
1733 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1734
1735 void
1736 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
1737 struct nfs_page *req, u64 wb_size)
1738 {
1739 if (pgio->pg_lseg == NULL)
1740 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1741 req->wb_context,
1742 req_offset(req),
1743 wb_size,
1744 IOMODE_RW,
1745 GFP_NOFS);
1746 /* If no lseg, fall back to write through mds */
1747 if (pgio->pg_lseg == NULL)
1748 nfs_pageio_reset_write_mds(pgio);
1749 }
1750 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1751
1752 void
1753 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
1754 {
1755 if (desc->pg_lseg) {
1756 pnfs_put_lseg(desc->pg_lseg);
1757 desc->pg_lseg = NULL;
1758 }
1759 }
1760 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
1761
1762 /*
1763 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1764 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1765 */
1766 size_t
1767 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
1768 struct nfs_page *prev, struct nfs_page *req)
1769 {
1770 unsigned int size;
1771 u64 seg_end, req_start, seg_left;
1772
1773 size = nfs_generic_pg_test(pgio, prev, req);
1774 if (!size)
1775 return 0;
1776
1777 /*
1778 * 'size' contains the number of bytes left in the current page (up
1779 * to the original size asked for in @req->wb_bytes).
1780 *
1781 * Calculate how many bytes are left in the layout segment
1782 * and if there are less bytes than 'size', return that instead.
1783 *
1784 * Please also note that 'end_offset' is actually the offset of the
1785 * first byte that lies outside the pnfs_layout_range. FIXME?
1786 *
1787 */
1788 if (pgio->pg_lseg) {
1789 seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
1790 pgio->pg_lseg->pls_range.length);
1791 req_start = req_offset(req);
1792 WARN_ON_ONCE(req_start >= seg_end);
1793 /* start of request is past the last byte of this segment */
1794 if (req_start >= seg_end) {
1795 /* reference the new lseg */
1796 if (pgio->pg_ops->pg_cleanup)
1797 pgio->pg_ops->pg_cleanup(pgio);
1798 if (pgio->pg_ops->pg_init)
1799 pgio->pg_ops->pg_init(pgio, req);
1800 return 0;
1801 }
1802
1803 /* adjust 'size' iff there are fewer bytes left in the
1804 * segment than what nfs_generic_pg_test returned */
1805 seg_left = seg_end - req_start;
1806 if (seg_left < size)
1807 size = (unsigned int)seg_left;
1808 }
1809
1810 return size;
1811 }
1812 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1813
1814 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1815 {
1816 struct nfs_pageio_descriptor pgio;
1817
1818 /* Resend all requests through the MDS */
1819 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
1820 hdr->completion_ops);
1821 return nfs_pageio_resend(&pgio, hdr);
1822 }
1823 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1824
1825 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1826 {
1827
1828 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1829 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1830 PNFS_LAYOUTRET_ON_ERROR) {
1831 pnfs_return_layout(hdr->inode);
1832 }
1833 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1834 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1835 }
1836
1837 /*
1838 * Called by non rpc-based layout drivers
1839 */
1840 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
1841 {
1842 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
1843 if (!hdr->pnfs_error) {
1844 pnfs_set_layoutcommit(hdr);
1845 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
1846 } else
1847 pnfs_ld_handle_write_error(hdr);
1848 hdr->mds_ops->rpc_release(hdr);
1849 }
1850 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1851
1852 static void
1853 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1854 struct nfs_pgio_header *hdr)
1855 {
1856 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1857
1858 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1859 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
1860 nfs_pageio_reset_write_mds(desc);
1861 mirror->pg_recoalesce = 1;
1862 }
1863 nfs_pgio_data_destroy(hdr);
1864 }
1865
1866 static enum pnfs_try_status
1867 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
1868 const struct rpc_call_ops *call_ops,
1869 struct pnfs_layout_segment *lseg,
1870 int how)
1871 {
1872 struct inode *inode = hdr->inode;
1873 enum pnfs_try_status trypnfs;
1874 struct nfs_server *nfss = NFS_SERVER(inode);
1875
1876 hdr->mds_ops = call_ops;
1877
1878 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1879 inode->i_ino, hdr->args.count, hdr->args.offset, how);
1880 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
1881 if (trypnfs != PNFS_NOT_ATTEMPTED)
1882 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1883 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1884 return trypnfs;
1885 }
1886
1887 static void
1888 pnfs_do_write(struct nfs_pageio_descriptor *desc,
1889 struct nfs_pgio_header *hdr, int how)
1890 {
1891 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1892 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1893 enum pnfs_try_status trypnfs;
1894
1895 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
1896 if (trypnfs == PNFS_NOT_ATTEMPTED)
1897 pnfs_write_through_mds(desc, hdr);
1898 }
1899
1900 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
1901 {
1902 pnfs_put_lseg(hdr->lseg);
1903 nfs_pgio_header_free(hdr);
1904 }
1905 EXPORT_SYMBOL_GPL(pnfs_writehdr_free);
1906
1907 int
1908 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1909 {
1910 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1911
1912 struct nfs_pgio_header *hdr;
1913 int ret;
1914
1915 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
1916 if (!hdr) {
1917 desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
1918 return -ENOMEM;
1919 }
1920 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
1921
1922 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1923 ret = nfs_generic_pgio(desc, hdr);
1924 if (!ret)
1925 pnfs_do_write(desc, hdr, desc->pg_ioflags);
1926
1927 return ret;
1928 }
1929 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1930
1931 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
1932 {
1933 struct nfs_pageio_descriptor pgio;
1934
1935 /* Resend all requests through the MDS */
1936 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
1937 return nfs_pageio_resend(&pgio, hdr);
1938 }
1939 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1940
1941 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
1942 {
1943 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
1944 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1945 PNFS_LAYOUTRET_ON_ERROR) {
1946 pnfs_return_layout(hdr->inode);
1947 }
1948 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1949 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
1950 }
1951
1952 /*
1953 * Called by non rpc-based layout drivers
1954 */
1955 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
1956 {
1957 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
1958 if (likely(!hdr->pnfs_error)) {
1959 __nfs4_read_done_cb(hdr);
1960 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
1961 } else
1962 pnfs_ld_handle_read_error(hdr);
1963 hdr->mds_ops->rpc_release(hdr);
1964 }
1965 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1966
1967 static void
1968 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1969 struct nfs_pgio_header *hdr)
1970 {
1971 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1972
1973 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1974 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
1975 nfs_pageio_reset_read_mds(desc);
1976 mirror->pg_recoalesce = 1;
1977 }
1978 nfs_pgio_data_destroy(hdr);
1979 }
1980
1981 /*
1982 * Call the appropriate parallel I/O subsystem read function.
1983 */
1984 static enum pnfs_try_status
1985 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
1986 const struct rpc_call_ops *call_ops,
1987 struct pnfs_layout_segment *lseg)
1988 {
1989 struct inode *inode = hdr->inode;
1990 struct nfs_server *nfss = NFS_SERVER(inode);
1991 enum pnfs_try_status trypnfs;
1992
1993 hdr->mds_ops = call_ops;
1994
1995 dprintk("%s: Reading ino:%lu %u@%llu\n",
1996 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
1997
1998 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
1999 if (trypnfs != PNFS_NOT_ATTEMPTED)
2000 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2001 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2002 return trypnfs;
2003 }
2004
2005 /* Resend all requests through pnfs. */
2006 int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2007 {
2008 struct nfs_pageio_descriptor pgio;
2009
2010 nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
2011 return nfs_pageio_resend(&pgio, hdr);
2012 }
2013 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2014
2015 static void
2016 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2017 {
2018 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2019 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2020 enum pnfs_try_status trypnfs;
2021 int err = 0;
2022
2023 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2024 if (trypnfs == PNFS_TRY_AGAIN)
2025 err = pnfs_read_resend_pnfs(hdr);
2026 if (trypnfs == PNFS_NOT_ATTEMPTED || err)
2027 pnfs_read_through_mds(desc, hdr);
2028 }
2029
2030 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2031 {
2032 pnfs_put_lseg(hdr->lseg);
2033 nfs_pgio_header_free(hdr);
2034 }
2035 EXPORT_SYMBOL_GPL(pnfs_readhdr_free);
2036
2037 int
2038 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2039 {
2040 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2041
2042 struct nfs_pgio_header *hdr;
2043 int ret;
2044
2045 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2046 if (!hdr) {
2047 desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
2048 return -ENOMEM;
2049 }
2050 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2051 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2052 ret = nfs_generic_pgio(desc, hdr);
2053 if (!ret)
2054 pnfs_do_read(desc, hdr);
2055 return ret;
2056 }
2057 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2058
2059 static void pnfs_clear_layoutcommitting(struct inode *inode)
2060 {
2061 unsigned long *bitlock = &NFS_I(inode)->flags;
2062
2063 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2064 smp_mb__after_atomic();
2065 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2066 }
2067
2068 /*
2069 * There can be multiple RW segments.
2070 */
2071 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2072 {
2073 struct pnfs_layout_segment *lseg;
2074
2075 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2076 if (lseg->pls_range.iomode == IOMODE_RW &&
2077 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2078 list_add(&lseg->pls_lc_list, listp);
2079 }
2080 }
2081
2082 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2083 {
2084 struct pnfs_layout_segment *lseg, *tmp;
2085
2086 /* Matched by references in pnfs_set_layoutcommit */
2087 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2088 list_del_init(&lseg->pls_lc_list);
2089 pnfs_put_lseg(lseg);
2090 }
2091
2092 pnfs_clear_layoutcommitting(inode);
2093 }
2094
2095 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2096 {
2097 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2098 }
2099 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2100
2101 void
2102 pnfs_set_layoutcommit(struct nfs_pgio_header *hdr)
2103 {
2104 struct inode *inode = hdr->inode;
2105 struct nfs_inode *nfsi = NFS_I(inode);
2106 loff_t end_pos = hdr->mds_offset + hdr->res.count;
2107 bool mark_as_dirty = false;
2108
2109 spin_lock(&inode->i_lock);
2110 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2111 mark_as_dirty = true;
2112 dprintk("%s: Set layoutcommit for inode %lu ",
2113 __func__, inode->i_ino);
2114 }
2115 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &hdr->lseg->pls_flags)) {
2116 /* references matched in nfs4_layoutcommit_release */
2117 pnfs_get_lseg(hdr->lseg);
2118 }
2119 if (end_pos > nfsi->layout->plh_lwb)
2120 nfsi->layout->plh_lwb = end_pos;
2121 spin_unlock(&inode->i_lock);
2122 dprintk("%s: lseg %p end_pos %llu\n",
2123 __func__, hdr->lseg, nfsi->layout->plh_lwb);
2124
2125 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2126 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2127 if (mark_as_dirty)
2128 mark_inode_dirty_sync(inode);
2129 }
2130 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2131
2132 void pnfs_commit_set_layoutcommit(struct nfs_commit_data *data)
2133 {
2134 struct inode *inode = data->inode;
2135 struct nfs_inode *nfsi = NFS_I(inode);
2136 bool mark_as_dirty = false;
2137
2138 spin_lock(&inode->i_lock);
2139 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2140 mark_as_dirty = true;
2141 dprintk("%s: Set layoutcommit for inode %lu ",
2142 __func__, inode->i_ino);
2143 }
2144 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &data->lseg->pls_flags)) {
2145 /* references matched in nfs4_layoutcommit_release */
2146 pnfs_get_lseg(data->lseg);
2147 }
2148 if (data->lwb > nfsi->layout->plh_lwb)
2149 nfsi->layout->plh_lwb = data->lwb;
2150 spin_unlock(&inode->i_lock);
2151 dprintk("%s: lseg %p end_pos %llu\n",
2152 __func__, data->lseg, nfsi->layout->plh_lwb);
2153
2154 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2155 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2156 if (mark_as_dirty)
2157 mark_inode_dirty_sync(inode);
2158 }
2159 EXPORT_SYMBOL_GPL(pnfs_commit_set_layoutcommit);
2160
2161 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2162 {
2163 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2164
2165 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2166 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2167 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2168 }
2169
2170 /*
2171 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2172 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2173 * data to disk to allow the server to recover the data if it crashes.
2174 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2175 * is off, and a COMMIT is sent to a data server, or
2176 * if WRITEs to a data server return NFS_DATA_SYNC.
2177 */
2178 int
2179 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2180 {
2181 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2182 struct nfs4_layoutcommit_data *data;
2183 struct nfs_inode *nfsi = NFS_I(inode);
2184 loff_t end_pos;
2185 int status;
2186
2187 if (!pnfs_layoutcommit_outstanding(inode))
2188 return 0;
2189
2190 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2191
2192 status = -EAGAIN;
2193 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2194 if (!sync)
2195 goto out;
2196 status = wait_on_bit_lock_action(&nfsi->flags,
2197 NFS_INO_LAYOUTCOMMITTING,
2198 nfs_wait_bit_killable,
2199 TASK_KILLABLE);
2200 if (status)
2201 goto out;
2202 }
2203
2204 status = -ENOMEM;
2205 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2206 data = kzalloc(sizeof(*data), GFP_NOFS);
2207 if (!data)
2208 goto clear_layoutcommitting;
2209
2210 status = 0;
2211 spin_lock(&inode->i_lock);
2212 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2213 goto out_unlock;
2214
2215 INIT_LIST_HEAD(&data->lseg_list);
2216 pnfs_list_write_lseg(inode, &data->lseg_list);
2217
2218 end_pos = nfsi->layout->plh_lwb;
2219 nfsi->layout->plh_lwb = 0;
2220
2221 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2222 spin_unlock(&inode->i_lock);
2223
2224 data->args.inode = inode;
2225 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2226 nfs_fattr_init(&data->fattr);
2227 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2228 data->res.fattr = &data->fattr;
2229 data->args.lastbytewritten = end_pos - 1;
2230 data->res.server = NFS_SERVER(inode);
2231
2232 if (ld->prepare_layoutcommit) {
2233 status = ld->prepare_layoutcommit(&data->args);
2234 if (status) {
2235 spin_lock(&inode->i_lock);
2236 if (end_pos < nfsi->layout->plh_lwb)
2237 nfsi->layout->plh_lwb = end_pos;
2238 spin_unlock(&inode->i_lock);
2239 put_rpccred(data->cred);
2240 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2241 goto clear_layoutcommitting;
2242 }
2243 }
2244
2245
2246 status = nfs4_proc_layoutcommit(data, sync);
2247 out:
2248 if (status)
2249 mark_inode_dirty_sync(inode);
2250 dprintk("<-- %s status %d\n", __func__, status);
2251 return status;
2252 out_unlock:
2253 spin_unlock(&inode->i_lock);
2254 kfree(data);
2255 clear_layoutcommitting:
2256 pnfs_clear_layoutcommitting(inode);
2257 goto out;
2258 }
2259 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2260
2261 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2262 {
2263 struct nfs4_threshold *thp;
2264
2265 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2266 if (!thp) {
2267 dprintk("%s mdsthreshold allocation failed\n", __func__);
2268 return NULL;
2269 }
2270 return thp;
2271 }
Linux with added FPC-III support