?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
irqchip: Fix dependencies for archs w/o HAS_IOMEM
[linux/fpc-iii.git] / fs / nfs / pnfs.c
blobbec0384499f76dd1acc8fb13bbf34c2ee17e6a9b
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 #include "nfs42.h"
39
40 #define NFSDBG_FACILITY NFSDBG_PNFS
41 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
42
43 /* Locking:
44 *
45 * pnfs_spinlock:
46 * protects pnfs_modules_tbl.
47 */
48 static DEFINE_SPINLOCK(pnfs_spinlock);
49
50 /*
51 * pnfs_modules_tbl holds all pnfs modules
52 */
53 static LIST_HEAD(pnfs_modules_tbl);
54
55 static int
56 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
57 enum pnfs_iomode iomode, bool sync);
58
59 /* Return the registered pnfs layout driver module matching given id */
60 static struct pnfs_layoutdriver_type *
61 find_pnfs_driver_locked(u32 id)
62 {
63 struct pnfs_layoutdriver_type *local;
64
65 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
66 if (local->id == id)
67 goto out;
68 local = NULL;
69 out:
70 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
71 return local;
72 }
73
74 static struct pnfs_layoutdriver_type *
75 find_pnfs_driver(u32 id)
76 {
77 struct pnfs_layoutdriver_type *local;
78
79 spin_lock(&pnfs_spinlock);
80 local = find_pnfs_driver_locked(id);
81 if (local != NULL && !try_module_get(local->owner)) {
82 dprintk("%s: Could not grab reference on module\n", __func__);
83 local = NULL;
84 }
85 spin_unlock(&pnfs_spinlock);
86 return local;
87 }
88
89 void
90 unset_pnfs_layoutdriver(struct nfs_server *nfss)
91 {
92 if (nfss->pnfs_curr_ld) {
93 if (nfss->pnfs_curr_ld->clear_layoutdriver)
94 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
95 /* Decrement the MDS count. Purge the deviceid cache if zero */
96 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
97 nfs4_deviceid_purge_client(nfss->nfs_client);
98 module_put(nfss->pnfs_curr_ld->owner);
99 }
100 nfss->pnfs_curr_ld = NULL;
101 }
102
103 /*
104 * Try to set the server's pnfs module to the pnfs layout type specified by id.
105 * Currently only one pNFS layout driver per filesystem is supported.
106 *
107 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
108 */
109 void
110 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
111 u32 id)
112 {
113 struct pnfs_layoutdriver_type *ld_type = NULL;
114
115 if (id == 0)
116 goto out_no_driver;
117 if (!(server->nfs_client->cl_exchange_flags &
118 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
119 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
120 __func__, id, server->nfs_client->cl_exchange_flags);
121 goto out_no_driver;
122 }
123 ld_type = find_pnfs_driver(id);
124 if (!ld_type) {
125 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
126 ld_type = find_pnfs_driver(id);
127 if (!ld_type) {
128 dprintk("%s: No pNFS module found for %u.\n",
129 __func__, id);
130 goto out_no_driver;
131 }
132 }
133 server->pnfs_curr_ld = ld_type;
134 if (ld_type->set_layoutdriver
135 && ld_type->set_layoutdriver(server, mntfh)) {
136 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
137 "driver %u.\n", __func__, id);
138 module_put(ld_type->owner);
139 goto out_no_driver;
140 }
141 /* Bump the MDS count */
142 atomic_inc(&server->nfs_client->cl_mds_count);
143
144 dprintk("%s: pNFS module for %u set\n", __func__, id);
145 return;
146
147 out_no_driver:
148 dprintk("%s: Using NFSv4 I/O\n", __func__);
149 server->pnfs_curr_ld = NULL;
150 }
151
152 int
153 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
154 {
155 int status = -EINVAL;
156 struct pnfs_layoutdriver_type *tmp;
157
158 if (ld_type->id == 0) {
159 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
160 return status;
161 }
162 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
163 printk(KERN_ERR "NFS: %s Layout driver must provide "
164 "alloc_lseg and free_lseg.\n", __func__);
165 return status;
166 }
167
168 spin_lock(&pnfs_spinlock);
169 tmp = find_pnfs_driver_locked(ld_type->id);
170 if (!tmp) {
171 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
172 status = 0;
173 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
174 ld_type->name);
175 } else {
176 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
177 __func__, ld_type->id);
178 }
179 spin_unlock(&pnfs_spinlock);
180
181 return status;
182 }
183 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
184
185 void
186 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
187 {
188 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
189 spin_lock(&pnfs_spinlock);
190 list_del(&ld_type->pnfs_tblid);
191 spin_unlock(&pnfs_spinlock);
192 }
193 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
194
195 /*
196 * pNFS client layout cache
197 */
198
199 /* Need to hold i_lock if caller does not already hold reference */
200 void
201 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
202 {
203 atomic_inc(&lo->plh_refcount);
204 }
205
206 static struct pnfs_layout_hdr *
207 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
208 {
209 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
210 return ld->alloc_layout_hdr(ino, gfp_flags);
211 }
212
213 static void
214 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
215 {
216 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
217 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
218
219 if (!list_empty(&lo->plh_layouts)) {
220 struct nfs_client *clp = server->nfs_client;
221
222 spin_lock(&clp->cl_lock);
223 list_del_init(&lo->plh_layouts);
224 spin_unlock(&clp->cl_lock);
225 }
226 put_rpccred(lo->plh_lc_cred);
227 return ld->free_layout_hdr(lo);
228 }
229
230 static void
231 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
232 {
233 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
234 dprintk("%s: freeing layout cache %p\n", __func__, lo);
235 nfsi->layout = NULL;
236 /* Reset MDS Threshold I/O counters */
237 nfsi->write_io = 0;
238 nfsi->read_io = 0;
239 }
240
241 void
242 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
243 {
244 struct inode *inode = lo->plh_inode;
245
246 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
247 if (!list_empty(&lo->plh_segs))
248 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
249 pnfs_detach_layout_hdr(lo);
250 spin_unlock(&inode->i_lock);
251 pnfs_free_layout_hdr(lo);
252 }
253 }
254
255 static int
256 pnfs_iomode_to_fail_bit(u32 iomode)
257 {
258 return iomode == IOMODE_RW ?
259 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
260 }
261
262 static void
263 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
264 {
265 lo->plh_retry_timestamp = jiffies;
266 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
267 atomic_inc(&lo->plh_refcount);
268 }
269
270 static void
271 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
272 {
273 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
274 atomic_dec(&lo->plh_refcount);
275 }
276
277 static void
278 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
279 {
280 struct inode *inode = lo->plh_inode;
281 struct pnfs_layout_range range = {
282 .iomode = iomode,
283 .offset = 0,
284 .length = NFS4_MAX_UINT64,
285 };
286 LIST_HEAD(head);
287
288 spin_lock(&inode->i_lock);
289 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
290 pnfs_mark_matching_lsegs_invalid(lo, &head, &range);
291 spin_unlock(&inode->i_lock);
292 pnfs_free_lseg_list(&head);
293 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
294 iomode == IOMODE_RW ? "RW" : "READ");
295 }
296
297 static bool
298 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
299 {
300 unsigned long start, end;
301 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
302
303 if (test_bit(fail_bit, &lo->plh_flags) == 0)
304 return false;
305 end = jiffies;
306 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
307 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
308 /* It is time to retry the failed layoutgets */
309 pnfs_layout_clear_fail_bit(lo, fail_bit);
310 return false;
311 }
312 return true;
313 }
314
315 static void
316 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
317 {
318 INIT_LIST_HEAD(&lseg->pls_list);
319 INIT_LIST_HEAD(&lseg->pls_lc_list);
320 atomic_set(&lseg->pls_refcount, 1);
321 smp_mb();
322 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
323 lseg->pls_layout = lo;
324 }
325
326 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
327 {
328 struct inode *ino = lseg->pls_layout->plh_inode;
329
330 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
331 }
332
333 static void
334 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
335 struct pnfs_layout_segment *lseg)
336 {
337 struct inode *inode = lo->plh_inode;
338
339 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
340 list_del_init(&lseg->pls_list);
341 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
342 atomic_dec(&lo->plh_refcount);
343 if (list_empty(&lo->plh_segs))
344 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
345 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
346 }
347
348 /* Return true if layoutreturn is needed */
349 static bool
350 pnfs_layout_need_return(struct pnfs_layout_hdr *lo,
351 struct pnfs_layout_segment *lseg)
352 {
353 struct pnfs_layout_segment *s;
354
355 if (!test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
356 return false;
357
358 list_for_each_entry(s, &lo->plh_segs, pls_list)
359 if (s != lseg && test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags))
360 return false;
361
362 return true;
363 }
364
365 static bool
366 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo)
367 {
368 if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
369 return false;
370 lo->plh_return_iomode = 0;
371 pnfs_get_layout_hdr(lo);
372 clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
373 return true;
374 }
375
376 static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment *lseg,
377 struct pnfs_layout_hdr *lo, struct inode *inode)
378 {
379 lo = lseg->pls_layout;
380 inode = lo->plh_inode;
381
382 spin_lock(&inode->i_lock);
383 if (pnfs_layout_need_return(lo, lseg)) {
384 nfs4_stateid stateid;
385 enum pnfs_iomode iomode;
386 bool send;
387
388 stateid = lo->plh_stateid;
389 iomode = lo->plh_return_iomode;
390 send = pnfs_prepare_layoutreturn(lo);
391 spin_unlock(&inode->i_lock);
392 if (send) {
393 /* Send an async layoutreturn so we dont deadlock */
394 pnfs_send_layoutreturn(lo, stateid, iomode, false);
395 }
396 } else
397 spin_unlock(&inode->i_lock);
398 }
399
400 void
401 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
402 {
403 struct pnfs_layout_hdr *lo;
404 struct inode *inode;
405
406 if (!lseg)
407 return;
408
409 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
410 atomic_read(&lseg->pls_refcount),
411 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
412
413 /* Handle the case where refcount != 1 */
414 if (atomic_add_unless(&lseg->pls_refcount, -1, 1))
415 return;
416
417 lo = lseg->pls_layout;
418 inode = lo->plh_inode;
419 /* Do we need a layoutreturn? */
420 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
421 pnfs_layoutreturn_before_put_lseg(lseg, lo, inode);
422
423 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
424 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
425 spin_unlock(&inode->i_lock);
426 return;
427 }
428 pnfs_get_layout_hdr(lo);
429 pnfs_layout_remove_lseg(lo, lseg);
430 spin_unlock(&inode->i_lock);
431 pnfs_free_lseg(lseg);
432 pnfs_put_layout_hdr(lo);
433 }
434 }
435 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
436
437 static void pnfs_free_lseg_async_work(struct work_struct *work)
438 {
439 struct pnfs_layout_segment *lseg;
440 struct pnfs_layout_hdr *lo;
441
442 lseg = container_of(work, struct pnfs_layout_segment, pls_work);
443 lo = lseg->pls_layout;
444
445 pnfs_free_lseg(lseg);
446 pnfs_put_layout_hdr(lo);
447 }
448
449 static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
450 {
451 INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
452 schedule_work(&lseg->pls_work);
453 }
454
455 void
456 pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
457 {
458 if (!lseg)
459 return;
460
461 assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
462
463 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
464 atomic_read(&lseg->pls_refcount),
465 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
466 if (atomic_dec_and_test(&lseg->pls_refcount)) {
467 struct pnfs_layout_hdr *lo = lseg->pls_layout;
468 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
469 return;
470 pnfs_get_layout_hdr(lo);
471 pnfs_layout_remove_lseg(lo, lseg);
472 pnfs_free_lseg_async(lseg);
473 }
474 }
475 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
476
477 static u64
478 end_offset(u64 start, u64 len)
479 {
480 u64 end;
481
482 end = start + len;
483 return end >= start ? end : NFS4_MAX_UINT64;
484 }
485
486 /*
487 * is l2 fully contained in l1?
488 * start1 end1
489 * [----------------------------------)
490 * start2 end2
491 * [----------------)
492 */
493 static bool
494 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
495 const struct pnfs_layout_range *l2)
496 {
497 u64 start1 = l1->offset;
498 u64 end1 = end_offset(start1, l1->length);
499 u64 start2 = l2->offset;
500 u64 end2 = end_offset(start2, l2->length);
501
502 return (start1 <= start2) && (end1 >= end2);
503 }
504
505 /*
506 * is l1 and l2 intersecting?
507 * start1 end1
508 * [----------------------------------)
509 * start2 end2
510 * [----------------)
511 */
512 static bool
513 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
514 const struct pnfs_layout_range *l2)
515 {
516 u64 start1 = l1->offset;
517 u64 end1 = end_offset(start1, l1->length);
518 u64 start2 = l2->offset;
519 u64 end2 = end_offset(start2, l2->length);
520
521 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
522 (end2 == NFS4_MAX_UINT64 || end2 > start1);
523 }
524
525 static bool
526 should_free_lseg(const struct pnfs_layout_range *lseg_range,
527 const struct pnfs_layout_range *recall_range)
528 {
529 return (recall_range->iomode == IOMODE_ANY ||
530 lseg_range->iomode == recall_range->iomode) &&
531 pnfs_lseg_range_intersecting(lseg_range, recall_range);
532 }
533
534 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
535 struct list_head *tmp_list)
536 {
537 if (!atomic_dec_and_test(&lseg->pls_refcount))
538 return false;
539 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
540 list_add(&lseg->pls_list, tmp_list);
541 return true;
542 }
543
544 /* Returns 1 if lseg is removed from list, 0 otherwise */
545 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
546 struct list_head *tmp_list)
547 {
548 int rv = 0;
549
550 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
551 /* Remove the reference keeping the lseg in the
552 * list. It will now be removed when all
553 * outstanding io is finished.
554 */
555 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
556 atomic_read(&lseg->pls_refcount));
557 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
558 rv = 1;
559 }
560 return rv;
561 }
562
563 /* Returns count of number of matching invalid lsegs remaining in list
564 * after call.
565 */
566 int
567 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
568 struct list_head *tmp_list,
569 struct pnfs_layout_range *recall_range)
570 {
571 struct pnfs_layout_segment *lseg, *next;
572 int invalid = 0, removed = 0;
573
574 dprintk("%s:Begin lo %p\n", __func__, lo);
575
576 if (list_empty(&lo->plh_segs))
577 return 0;
578 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
579 if (!recall_range ||
580 should_free_lseg(&lseg->pls_range, recall_range)) {
581 dprintk("%s: freeing lseg %p iomode %d "
582 "offset %llu length %llu\n", __func__,
583 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
584 lseg->pls_range.length);
585 invalid++;
586 removed += mark_lseg_invalid(lseg, tmp_list);
587 }
588 dprintk("%s:Return %i\n", __func__, invalid - removed);
589 return invalid - removed;
590 }
591
592 /* note free_me must contain lsegs from a single layout_hdr */
593 void
594 pnfs_free_lseg_list(struct list_head *free_me)
595 {
596 struct pnfs_layout_segment *lseg, *tmp;
597
598 if (list_empty(free_me))
599 return;
600
601 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
602 list_del(&lseg->pls_list);
603 pnfs_free_lseg(lseg);
604 }
605 }
606
607 void
608 pnfs_destroy_layout(struct nfs_inode *nfsi)
609 {
610 struct pnfs_layout_hdr *lo;
611 LIST_HEAD(tmp_list);
612
613 spin_lock(&nfsi->vfs_inode.i_lock);
614 lo = nfsi->layout;
615 if (lo) {
616 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
617 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
618 pnfs_get_layout_hdr(lo);
619 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
620 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
621 pnfs_clear_retry_layoutget(lo);
622 spin_unlock(&nfsi->vfs_inode.i_lock);
623 pnfs_free_lseg_list(&tmp_list);
624 pnfs_put_layout_hdr(lo);
625 } else
626 spin_unlock(&nfsi->vfs_inode.i_lock);
627 }
628 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
629
630 static bool
631 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
632 struct list_head *layout_list)
633 {
634 struct pnfs_layout_hdr *lo;
635 bool ret = false;
636
637 spin_lock(&inode->i_lock);
638 lo = NFS_I(inode)->layout;
639 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
640 pnfs_get_layout_hdr(lo);
641 list_add(&lo->plh_bulk_destroy, layout_list);
642 ret = true;
643 }
644 spin_unlock(&inode->i_lock);
645 return ret;
646 }
647
648 /* Caller must hold rcu_read_lock and clp->cl_lock */
649 static int
650 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
651 struct nfs_server *server,
652 struct list_head *layout_list)
653 {
654 struct pnfs_layout_hdr *lo, *next;
655 struct inode *inode;
656
657 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
658 inode = igrab(lo->plh_inode);
659 if (inode == NULL)
660 continue;
661 list_del_init(&lo->plh_layouts);
662 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
663 continue;
664 rcu_read_unlock();
665 spin_unlock(&clp->cl_lock);
666 iput(inode);
667 spin_lock(&clp->cl_lock);
668 rcu_read_lock();
669 return -EAGAIN;
670 }
671 return 0;
672 }
673
674 static int
675 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
676 bool is_bulk_recall)
677 {
678 struct pnfs_layout_hdr *lo;
679 struct inode *inode;
680 struct pnfs_layout_range range = {
681 .iomode = IOMODE_ANY,
682 .offset = 0,
683 .length = NFS4_MAX_UINT64,
684 };
685 LIST_HEAD(lseg_list);
686 int ret = 0;
687
688 while (!list_empty(layout_list)) {
689 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
690 plh_bulk_destroy);
691 dprintk("%s freeing layout for inode %lu\n", __func__,
692 lo->plh_inode->i_ino);
693 inode = lo->plh_inode;
694
695 pnfs_layoutcommit_inode(inode, false);
696
697 spin_lock(&inode->i_lock);
698 list_del_init(&lo->plh_bulk_destroy);
699 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
700 if (is_bulk_recall)
701 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
702 if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range))
703 ret = -EAGAIN;
704 spin_unlock(&inode->i_lock);
705 pnfs_free_lseg_list(&lseg_list);
706 pnfs_put_layout_hdr(lo);
707 iput(inode);
708 }
709 return ret;
710 }
711
712 int
713 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
714 struct nfs_fsid *fsid,
715 bool is_recall)
716 {
717 struct nfs_server *server;
718 LIST_HEAD(layout_list);
719
720 spin_lock(&clp->cl_lock);
721 rcu_read_lock();
722 restart:
723 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
724 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
725 continue;
726 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
727 server,
728 &layout_list) != 0)
729 goto restart;
730 }
731 rcu_read_unlock();
732 spin_unlock(&clp->cl_lock);
733
734 if (list_empty(&layout_list))
735 return 0;
736 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
737 }
738
739 int
740 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
741 bool is_recall)
742 {
743 struct nfs_server *server;
744 LIST_HEAD(layout_list);
745
746 spin_lock(&clp->cl_lock);
747 rcu_read_lock();
748 restart:
749 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
750 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
751 server,
752 &layout_list) != 0)
753 goto restart;
754 }
755 rcu_read_unlock();
756 spin_unlock(&clp->cl_lock);
757
758 if (list_empty(&layout_list))
759 return 0;
760 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
761 }
762
763 /*
764 * Called by the state manger to remove all layouts established under an
765 * expired lease.
766 */
767 void
768 pnfs_destroy_all_layouts(struct nfs_client *clp)
769 {
770 nfs4_deviceid_mark_client_invalid(clp);
771 nfs4_deviceid_purge_client(clp);
772
773 pnfs_destroy_layouts_byclid(clp, false);
774 }
775
776 /*
777 * Compare 2 layout stateid sequence ids, to see which is newer,
778 * taking into account wraparound issues.
779 */
780 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
781 {
782 return (s32)(s1 - s2) > 0;
783 }
784
785 /* update lo->plh_stateid with new if is more recent */
786 void
787 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
788 bool update_barrier)
789 {
790 u32 oldseq, newseq, new_barrier;
791 int empty = list_empty(&lo->plh_segs);
792
793 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
794 newseq = be32_to_cpu(new->seqid);
795 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
796 nfs4_stateid_copy(&lo->plh_stateid, new);
797 if (update_barrier) {
798 new_barrier = be32_to_cpu(new->seqid);
799 } else {
800 /* Because of wraparound, we want to keep the barrier
801 * "close" to the current seqids.
802 */
803 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
804 }
805 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
806 lo->plh_barrier = new_barrier;
807 }
808 }
809
810 static bool
811 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
812 const nfs4_stateid *stateid)
813 {
814 u32 seqid = be32_to_cpu(stateid->seqid);
815
816 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
817 }
818
819 /* lget is set to 1 if called from inside send_layoutget call chain */
820 static bool
821 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
822 {
823 return lo->plh_block_lgets ||
824 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
825 }
826
827 int
828 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
829 struct pnfs_layout_range *range,
830 struct nfs4_state *open_state)
831 {
832 int status = 0;
833
834 dprintk("--> %s\n", __func__);
835 spin_lock(&lo->plh_inode->i_lock);
836 if (pnfs_layoutgets_blocked(lo)) {
837 status = -EAGAIN;
838 } else if (!nfs4_valid_open_stateid(open_state)) {
839 status = -EBADF;
840 } else if (list_empty(&lo->plh_segs) ||
841 test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
842 int seq;
843
844 do {
845 seq = read_seqbegin(&open_state->seqlock);
846 nfs4_stateid_copy(dst, &open_state->stateid);
847 } while (read_seqretry(&open_state->seqlock, seq));
848 } else
849 nfs4_stateid_copy(dst, &lo->plh_stateid);
850 spin_unlock(&lo->plh_inode->i_lock);
851 dprintk("<-- %s\n", __func__);
852 return status;
853 }
854
855 /*
856 * Get layout from server.
857 * for now, assume that whole file layouts are requested.
858 * arg->offset: 0
859 * arg->length: all ones
860 */
861 static struct pnfs_layout_segment *
862 send_layoutget(struct pnfs_layout_hdr *lo,
863 struct nfs_open_context *ctx,
864 struct pnfs_layout_range *range,
865 gfp_t gfp_flags)
866 {
867 struct inode *ino = lo->plh_inode;
868 struct nfs_server *server = NFS_SERVER(ino);
869 struct nfs4_layoutget *lgp;
870 struct pnfs_layout_segment *lseg;
871 loff_t i_size;
872
873 dprintk("--> %s\n", __func__);
874
875 /*
876 * Synchronously retrieve layout information from server and
877 * store in lseg. If we race with a concurrent seqid morphing
878 * op, then re-send the LAYOUTGET.
879 */
880 do {
881 lgp = kzalloc(sizeof(*lgp), gfp_flags);
882 if (lgp == NULL)
883 return NULL;
884
885 i_size = i_size_read(ino);
886
887 lgp->args.minlength = PAGE_CACHE_SIZE;
888 if (lgp->args.minlength > range->length)
889 lgp->args.minlength = range->length;
890 if (range->iomode == IOMODE_READ) {
891 if (range->offset >= i_size)
892 lgp->args.minlength = 0;
893 else if (i_size - range->offset < lgp->args.minlength)
894 lgp->args.minlength = i_size - range->offset;
895 }
896 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
897 lgp->args.range = *range;
898 lgp->args.type = server->pnfs_curr_ld->id;
899 lgp->args.inode = ino;
900 lgp->args.ctx = get_nfs_open_context(ctx);
901 lgp->gfp_flags = gfp_flags;
902 lgp->cred = lo->plh_lc_cred;
903
904 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
905 } while (lseg == ERR_PTR(-EAGAIN));
906
907 if (IS_ERR(lseg)) {
908 switch (PTR_ERR(lseg)) {
909 case -ENOMEM:
910 case -ERESTARTSYS:
911 break;
912 default:
913 /* remember that LAYOUTGET failed and suspend trying */
914 pnfs_layout_io_set_failed(lo, range->iomode);
915 }
916 return NULL;
917 } else
918 pnfs_layout_clear_fail_bit(lo,
919 pnfs_iomode_to_fail_bit(range->iomode));
920
921 return lseg;
922 }
923
924 static void pnfs_clear_layoutcommit(struct inode *inode,
925 struct list_head *head)
926 {
927 struct nfs_inode *nfsi = NFS_I(inode);
928 struct pnfs_layout_segment *lseg, *tmp;
929
930 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
931 return;
932 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
933 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
934 continue;
935 pnfs_lseg_dec_and_remove_zero(lseg, head);
936 }
937 }
938
939 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
940 {
941 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
942 smp_mb__after_atomic();
943 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
944 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
945 }
946
947 static int
948 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
949 enum pnfs_iomode iomode, bool sync)
950 {
951 struct inode *ino = lo->plh_inode;
952 struct nfs4_layoutreturn *lrp;
953 int status = 0;
954
955 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
956 if (unlikely(lrp == NULL)) {
957 status = -ENOMEM;
958 spin_lock(&ino->i_lock);
959 pnfs_clear_layoutreturn_waitbit(lo);
960 spin_unlock(&ino->i_lock);
961 pnfs_put_layout_hdr(lo);
962 goto out;
963 }
964
965 lrp->args.stateid = stateid;
966 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
967 lrp->args.inode = ino;
968 lrp->args.range.iomode = iomode;
969 lrp->args.range.offset = 0;
970 lrp->args.range.length = NFS4_MAX_UINT64;
971 lrp->args.layout = lo;
972 lrp->clp = NFS_SERVER(ino)->nfs_client;
973 lrp->cred = lo->plh_lc_cred;
974
975 status = nfs4_proc_layoutreturn(lrp, sync);
976 out:
977 dprintk("<-- %s status: %d\n", __func__, status);
978 return status;
979 }
980
981 /*
982 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
983 * when the layout segment list is empty.
984 *
985 * Note that a pnfs_layout_hdr can exist with an empty layout segment
986 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
987 * deviceid is marked invalid.
988 */
989 int
990 _pnfs_return_layout(struct inode *ino)
991 {
992 struct pnfs_layout_hdr *lo = NULL;
993 struct nfs_inode *nfsi = NFS_I(ino);
994 LIST_HEAD(tmp_list);
995 nfs4_stateid stateid;
996 int status = 0, empty;
997 bool send;
998
999 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1000
1001 spin_lock(&ino->i_lock);
1002 lo = nfsi->layout;
1003 if (!lo) {
1004 spin_unlock(&ino->i_lock);
1005 dprintk("NFS: %s no layout to return\n", __func__);
1006 goto out;
1007 }
1008 stateid = nfsi->layout->plh_stateid;
1009 /* Reference matched in nfs4_layoutreturn_release */
1010 pnfs_get_layout_hdr(lo);
1011 empty = list_empty(&lo->plh_segs);
1012 pnfs_clear_layoutcommit(ino, &tmp_list);
1013 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
1014
1015 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1016 struct pnfs_layout_range range = {
1017 .iomode = IOMODE_ANY,
1018 .offset = 0,
1019 .length = NFS4_MAX_UINT64,
1020 };
1021 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1022 }
1023
1024 /* Don't send a LAYOUTRETURN if list was initially empty */
1025 if (empty) {
1026 spin_unlock(&ino->i_lock);
1027 dprintk("NFS: %s no layout segments to return\n", __func__);
1028 goto out_put_layout_hdr;
1029 }
1030
1031 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1032 send = pnfs_prepare_layoutreturn(lo);
1033 spin_unlock(&ino->i_lock);
1034 pnfs_free_lseg_list(&tmp_list);
1035 if (send)
1036 status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
1037 out_put_layout_hdr:
1038 pnfs_put_layout_hdr(lo);
1039 out:
1040 dprintk("<-- %s status: %d\n", __func__, status);
1041 return status;
1042 }
1043 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
1044
1045 int
1046 pnfs_commit_and_return_layout(struct inode *inode)
1047 {
1048 struct pnfs_layout_hdr *lo;
1049 int ret;
1050
1051 spin_lock(&inode->i_lock);
1052 lo = NFS_I(inode)->layout;
1053 if (lo == NULL) {
1054 spin_unlock(&inode->i_lock);
1055 return 0;
1056 }
1057 pnfs_get_layout_hdr(lo);
1058 /* Block new layoutgets and read/write to ds */
1059 lo->plh_block_lgets++;
1060 spin_unlock(&inode->i_lock);
1061 filemap_fdatawait(inode->i_mapping);
1062 ret = pnfs_layoutcommit_inode(inode, true);
1063 if (ret == 0)
1064 ret = _pnfs_return_layout(inode);
1065 spin_lock(&inode->i_lock);
1066 lo->plh_block_lgets--;
1067 spin_unlock(&inode->i_lock);
1068 pnfs_put_layout_hdr(lo);
1069 return ret;
1070 }
1071
1072 bool pnfs_roc(struct inode *ino)
1073 {
1074 struct nfs_inode *nfsi = NFS_I(ino);
1075 struct nfs_open_context *ctx;
1076 struct nfs4_state *state;
1077 struct pnfs_layout_hdr *lo;
1078 struct pnfs_layout_segment *lseg, *tmp;
1079 nfs4_stateid stateid;
1080 LIST_HEAD(tmp_list);
1081 bool found = false, layoutreturn = false, roc = false;
1082
1083 spin_lock(&ino->i_lock);
1084 lo = nfsi->layout;
1085 if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1086 goto out_noroc;
1087
1088 /* no roc if we hold a delegation */
1089 if (nfs4_check_delegation(ino, FMODE_READ))
1090 goto out_noroc;
1091
1092 list_for_each_entry(ctx, &nfsi->open_files, list) {
1093 state = ctx->state;
1094 /* Don't return layout if there is open file state */
1095 if (state != NULL && state->state != 0)
1096 goto out_noroc;
1097 }
1098
1099 stateid = lo->plh_stateid;
1100 /* always send layoutreturn if being marked so */
1101 if (test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1102 &lo->plh_flags))
1103 layoutreturn = pnfs_prepare_layoutreturn(lo);
1104
1105 pnfs_clear_retry_layoutget(lo);
1106 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1107 /* If we are sending layoutreturn, invalidate all valid lsegs */
1108 if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
1109 mark_lseg_invalid(lseg, &tmp_list);
1110 found = true;
1111 }
1112 /* ROC in two conditions:
1113 * 1. there are ROC lsegs
1114 * 2. we don't send layoutreturn
1115 */
1116 if (found && !layoutreturn) {
1117 /* lo ref dropped in pnfs_roc_release() */
1118 pnfs_get_layout_hdr(lo);
1119 roc = true;
1120 }
1121
1122 out_noroc:
1123 spin_unlock(&ino->i_lock);
1124 pnfs_free_lseg_list(&tmp_list);
1125 pnfs_layoutcommit_inode(ino, true);
1126 if (layoutreturn)
1127 pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
1128 return roc;
1129 }
1130
1131 void pnfs_roc_release(struct inode *ino)
1132 {
1133 struct pnfs_layout_hdr *lo;
1134
1135 spin_lock(&ino->i_lock);
1136 lo = NFS_I(ino)->layout;
1137 pnfs_clear_layoutreturn_waitbit(lo);
1138 if (atomic_dec_and_test(&lo->plh_refcount)) {
1139 pnfs_detach_layout_hdr(lo);
1140 spin_unlock(&ino->i_lock);
1141 pnfs_free_layout_hdr(lo);
1142 } else
1143 spin_unlock(&ino->i_lock);
1144 }
1145
1146 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
1147 {
1148 struct pnfs_layout_hdr *lo;
1149
1150 spin_lock(&ino->i_lock);
1151 lo = NFS_I(ino)->layout;
1152 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
1153 lo->plh_barrier = barrier;
1154 spin_unlock(&ino->i_lock);
1155 trace_nfs4_layoutreturn_on_close(ino, 0);
1156 }
1157
1158 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
1159 {
1160 struct nfs_inode *nfsi = NFS_I(ino);
1161 struct pnfs_layout_hdr *lo;
1162 u32 current_seqid;
1163
1164 spin_lock(&ino->i_lock);
1165 lo = nfsi->layout;
1166 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
1167
1168 /* Since close does not return a layout stateid for use as
1169 * a barrier, we choose the worst-case barrier.
1170 */
1171 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
1172 spin_unlock(&ino->i_lock);
1173 }
1174
1175 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1176 {
1177 struct nfs_inode *nfsi = NFS_I(ino);
1178 struct pnfs_layout_hdr *lo;
1179 bool sleep = false;
1180
1181 /* we might not have grabbed lo reference. so need to check under
1182 * i_lock */
1183 spin_lock(&ino->i_lock);
1184 lo = nfsi->layout;
1185 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
1186 sleep = true;
1187 spin_unlock(&ino->i_lock);
1188
1189 if (sleep)
1190 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1191
1192 return sleep;
1193 }
1194
1195 /*
1196 * Compare two layout segments for sorting into layout cache.
1197 * We want to preferentially return RW over RO layouts, so ensure those
1198 * are seen first.
1199 */
1200 static s64
1201 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1202 const struct pnfs_layout_range *l2)
1203 {
1204 s64 d;
1205
1206 /* high offset > low offset */
1207 d = l1->offset - l2->offset;
1208 if (d)
1209 return d;
1210
1211 /* short length > long length */
1212 d = l2->length - l1->length;
1213 if (d)
1214 return d;
1215
1216 /* read > read/write */
1217 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1218 }
1219
1220 static bool
1221 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1222 const struct pnfs_layout_range *l2)
1223 {
1224 return pnfs_lseg_range_cmp(l1, l2) > 0;
1225 }
1226
1227 static bool
1228 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1229 struct pnfs_layout_segment *old)
1230 {
1231 return false;
1232 }
1233
1234 void
1235 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1236 struct pnfs_layout_segment *lseg,
1237 bool (*is_after)(const struct pnfs_layout_range *,
1238 const struct pnfs_layout_range *),
1239 bool (*do_merge)(struct pnfs_layout_segment *,
1240 struct pnfs_layout_segment *),
1241 struct list_head *free_me)
1242 {
1243 struct pnfs_layout_segment *lp, *tmp;
1244
1245 dprintk("%s:Begin\n", __func__);
1246
1247 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1248 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1249 continue;
1250 if (do_merge(lseg, lp)) {
1251 mark_lseg_invalid(lp, free_me);
1252 continue;
1253 }
1254 if (is_after(&lseg->pls_range, &lp->pls_range))
1255 continue;
1256 list_add_tail(&lseg->pls_list, &lp->pls_list);
1257 dprintk("%s: inserted lseg %p "
1258 "iomode %d offset %llu length %llu before "
1259 "lp %p iomode %d offset %llu length %llu\n",
1260 __func__, lseg, lseg->pls_range.iomode,
1261 lseg->pls_range.offset, lseg->pls_range.length,
1262 lp, lp->pls_range.iomode, lp->pls_range.offset,
1263 lp->pls_range.length);
1264 goto out;
1265 }
1266 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1267 dprintk("%s: inserted lseg %p "
1268 "iomode %d offset %llu length %llu at tail\n",
1269 __func__, lseg, lseg->pls_range.iomode,
1270 lseg->pls_range.offset, lseg->pls_range.length);
1271 out:
1272 pnfs_get_layout_hdr(lo);
1273
1274 dprintk("%s:Return\n", __func__);
1275 }
1276 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1277
1278 static void
1279 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1280 struct pnfs_layout_segment *lseg,
1281 struct list_head *free_me)
1282 {
1283 struct inode *inode = lo->plh_inode;
1284 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1285
1286 if (ld->add_lseg != NULL)
1287 ld->add_lseg(lo, lseg, free_me);
1288 else
1289 pnfs_generic_layout_insert_lseg(lo, lseg,
1290 pnfs_lseg_range_is_after,
1291 pnfs_lseg_no_merge,
1292 free_me);
1293 }
1294
1295 static struct pnfs_layout_hdr *
1296 alloc_init_layout_hdr(struct inode *ino,
1297 struct nfs_open_context *ctx,
1298 gfp_t gfp_flags)
1299 {
1300 struct pnfs_layout_hdr *lo;
1301
1302 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1303 if (!lo)
1304 return NULL;
1305 atomic_set(&lo->plh_refcount, 1);
1306 INIT_LIST_HEAD(&lo->plh_layouts);
1307 INIT_LIST_HEAD(&lo->plh_segs);
1308 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1309 lo->plh_inode = ino;
1310 lo->plh_lc_cred = get_rpccred(ctx->cred);
1311 return lo;
1312 }
1313
1314 static struct pnfs_layout_hdr *
1315 pnfs_find_alloc_layout(struct inode *ino,
1316 struct nfs_open_context *ctx,
1317 gfp_t gfp_flags)
1318 {
1319 struct nfs_inode *nfsi = NFS_I(ino);
1320 struct pnfs_layout_hdr *new = NULL;
1321
1322 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1323
1324 if (nfsi->layout != NULL)
1325 goto out_existing;
1326 spin_unlock(&ino->i_lock);
1327 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1328 spin_lock(&ino->i_lock);
1329
1330 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1331 nfsi->layout = new;
1332 return new;
1333 } else if (new != NULL)
1334 pnfs_free_layout_hdr(new);
1335 out_existing:
1336 pnfs_get_layout_hdr(nfsi->layout);
1337 return nfsi->layout;
1338 }
1339
1340 /*
1341 * iomode matching rules:
1342 * iomode lseg match
1343 * ----- ----- -----
1344 * ANY READ true
1345 * ANY RW true
1346 * RW READ false
1347 * RW RW true
1348 * READ READ true
1349 * READ RW true
1350 */
1351 static bool
1352 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1353 const struct pnfs_layout_range *range)
1354 {
1355 struct pnfs_layout_range range1;
1356
1357 if ((range->iomode == IOMODE_RW &&
1358 ls_range->iomode != IOMODE_RW) ||
1359 !pnfs_lseg_range_intersecting(ls_range, range))
1360 return 0;
1361
1362 /* range1 covers only the first byte in the range */
1363 range1 = *range;
1364 range1.length = 1;
1365 return pnfs_lseg_range_contained(ls_range, &range1);
1366 }
1367
1368 /*
1369 * lookup range in layout
1370 */
1371 static struct pnfs_layout_segment *
1372 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1373 struct pnfs_layout_range *range)
1374 {
1375 struct pnfs_layout_segment *lseg, *ret = NULL;
1376
1377 dprintk("%s:Begin\n", __func__);
1378
1379 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1380 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1381 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1382 pnfs_lseg_range_match(&lseg->pls_range, range)) {
1383 ret = pnfs_get_lseg(lseg);
1384 break;
1385 }
1386 }
1387
1388 dprintk("%s:Return lseg %p ref %d\n",
1389 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1390 return ret;
1391 }
1392
1393 /*
1394 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1395 * to the MDS or over pNFS
1396 *
1397 * The nfs_inode read_io and write_io fields are cumulative counters reset
1398 * when there are no layout segments. Note that in pnfs_update_layout iomode
1399 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1400 * WRITE request.
1401 *
1402 * A return of true means use MDS I/O.
1403 *
1404 * From rfc 5661:
1405 * If a file's size is smaller than the file size threshold, data accesses
1406 * SHOULD be sent to the metadata server. If an I/O request has a length that
1407 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1408 * server. If both file size and I/O size are provided, the client SHOULD
1409 * reach or exceed both thresholds before sending its read or write
1410 * requests to the data server.
1411 */
1412 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1413 struct inode *ino, int iomode)
1414 {
1415 struct nfs4_threshold *t = ctx->mdsthreshold;
1416 struct nfs_inode *nfsi = NFS_I(ino);
1417 loff_t fsize = i_size_read(ino);
1418 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1419
1420 if (t == NULL)
1421 return ret;
1422
1423 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1424 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1425
1426 switch (iomode) {
1427 case IOMODE_READ:
1428 if (t->bm & THRESHOLD_RD) {
1429 dprintk("%s fsize %llu\n", __func__, fsize);
1430 size_set = true;
1431 if (fsize < t->rd_sz)
1432 size = true;
1433 }
1434 if (t->bm & THRESHOLD_RD_IO) {
1435 dprintk("%s nfsi->read_io %llu\n", __func__,
1436 nfsi->read_io);
1437 io_set = true;
1438 if (nfsi->read_io < t->rd_io_sz)
1439 io = true;
1440 }
1441 break;
1442 case IOMODE_RW:
1443 if (t->bm & THRESHOLD_WR) {
1444 dprintk("%s fsize %llu\n", __func__, fsize);
1445 size_set = true;
1446 if (fsize < t->wr_sz)
1447 size = true;
1448 }
1449 if (t->bm & THRESHOLD_WR_IO) {
1450 dprintk("%s nfsi->write_io %llu\n", __func__,
1451 nfsi->write_io);
1452 io_set = true;
1453 if (nfsi->write_io < t->wr_io_sz)
1454 io = true;
1455 }
1456 break;
1457 }
1458 if (size_set && io_set) {
1459 if (size && io)
1460 ret = true;
1461 } else if (size || io)
1462 ret = true;
1463
1464 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1465 return ret;
1466 }
1467
1468 /* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
1469 static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key, int mode)
1470 {
1471 if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags))
1472 return 1;
1473 return nfs_wait_bit_killable(key, mode);
1474 }
1475
1476 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1477 {
1478 if (!pnfs_should_retry_layoutget(lo))
1479 return false;
1480 /*
1481 * send layoutcommit as it can hold up layoutreturn due to lseg
1482 * reference
1483 */
1484 pnfs_layoutcommit_inode(lo->plh_inode, false);
1485 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1486 pnfs_layoutget_retry_bit_wait,
1487 TASK_UNINTERRUPTIBLE);
1488 }
1489
1490 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1491 {
1492 unsigned long *bitlock = &lo->plh_flags;
1493
1494 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1495 smp_mb__after_atomic();
1496 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1497 }
1498
1499 /*
1500 * Layout segment is retreived from the server if not cached.
1501 * The appropriate layout segment is referenced and returned to the caller.
1502 */
1503 struct pnfs_layout_segment *
1504 pnfs_update_layout(struct inode *ino,
1505 struct nfs_open_context *ctx,
1506 loff_t pos,
1507 u64 count,
1508 enum pnfs_iomode iomode,
1509 gfp_t gfp_flags)
1510 {
1511 struct pnfs_layout_range arg = {
1512 .iomode = iomode,
1513 .offset = pos,
1514 .length = count,
1515 };
1516 unsigned pg_offset;
1517 struct nfs_server *server = NFS_SERVER(ino);
1518 struct nfs_client *clp = server->nfs_client;
1519 struct pnfs_layout_hdr *lo;
1520 struct pnfs_layout_segment *lseg = NULL;
1521 bool first;
1522
1523 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
1524 goto out;
1525
1526 if (iomode == IOMODE_READ && i_size_read(ino) == 0)
1527 goto out;
1528
1529 if (pnfs_within_mdsthreshold(ctx, ino, iomode))
1530 goto out;
1531
1532 lookup_again:
1533 first = false;
1534 spin_lock(&ino->i_lock);
1535 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1536 if (lo == NULL) {
1537 spin_unlock(&ino->i_lock);
1538 goto out;
1539 }
1540
1541 /* Do we even need to bother with this? */
1542 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1543 dprintk("%s matches recall, use MDS\n", __func__);
1544 goto out_unlock;
1545 }
1546
1547 /* if LAYOUTGET already failed once we don't try again */
1548 if (pnfs_layout_io_test_failed(lo, iomode) &&
1549 !pnfs_should_retry_layoutget(lo))
1550 goto out_unlock;
1551
1552 first = list_empty(&lo->plh_segs);
1553 if (first) {
1554 /* The first layoutget for the file. Need to serialize per
1555 * RFC 5661 Errata 3208.
1556 */
1557 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1558 &lo->plh_flags)) {
1559 spin_unlock(&ino->i_lock);
1560 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1561 TASK_UNINTERRUPTIBLE);
1562 pnfs_put_layout_hdr(lo);
1563 goto lookup_again;
1564 }
1565 } else {
1566 /* Check to see if the layout for the given range
1567 * already exists
1568 */
1569 lseg = pnfs_find_lseg(lo, &arg);
1570 if (lseg)
1571 goto out_unlock;
1572 }
1573
1574 /*
1575 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1576 * for LAYOUTRETURN even if first is true.
1577 */
1578 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1579 spin_unlock(&ino->i_lock);
1580 dprintk("%s wait for layoutreturn\n", __func__);
1581 if (pnfs_prepare_to_retry_layoutget(lo)) {
1582 if (first)
1583 pnfs_clear_first_layoutget(lo);
1584 pnfs_put_layout_hdr(lo);
1585 dprintk("%s retrying\n", __func__);
1586 goto lookup_again;
1587 }
1588 goto out_put_layout_hdr;
1589 }
1590
1591 if (pnfs_layoutgets_blocked(lo))
1592 goto out_unlock;
1593 atomic_inc(&lo->plh_outstanding);
1594 spin_unlock(&ino->i_lock);
1595
1596 if (list_empty(&lo->plh_layouts)) {
1597 /* The lo must be on the clp list if there is any
1598 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1599 */
1600 spin_lock(&clp->cl_lock);
1601 if (list_empty(&lo->plh_layouts))
1602 list_add_tail(&lo->plh_layouts, &server->layouts);
1603 spin_unlock(&clp->cl_lock);
1604 }
1605
1606 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1607 if (pg_offset) {
1608 arg.offset -= pg_offset;
1609 arg.length += pg_offset;
1610 }
1611 if (arg.length != NFS4_MAX_UINT64)
1612 arg.length = PAGE_CACHE_ALIGN(arg.length);
1613
1614 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1615 pnfs_clear_retry_layoutget(lo);
1616 atomic_dec(&lo->plh_outstanding);
1617 out_put_layout_hdr:
1618 if (first)
1619 pnfs_clear_first_layoutget(lo);
1620 pnfs_put_layout_hdr(lo);
1621 out:
1622 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1623 "(%s, offset: %llu, length: %llu)\n",
1624 __func__, ino->i_sb->s_id,
1625 (unsigned long long)NFS_FILEID(ino),
1626 lseg == NULL ? "not found" : "found",
1627 iomode==IOMODE_RW ? "read/write" : "read-only",
1628 (unsigned long long)pos,
1629 (unsigned long long)count);
1630 return lseg;
1631 out_unlock:
1632 spin_unlock(&ino->i_lock);
1633 goto out_put_layout_hdr;
1634 }
1635 EXPORT_SYMBOL_GPL(pnfs_update_layout);
1636
1637 static bool
1638 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1639 {
1640 switch (range->iomode) {
1641 case IOMODE_READ:
1642 case IOMODE_RW:
1643 break;
1644 default:
1645 return false;
1646 }
1647 if (range->offset == NFS4_MAX_UINT64)
1648 return false;
1649 if (range->length == 0)
1650 return false;
1651 if (range->length != NFS4_MAX_UINT64 &&
1652 range->length > NFS4_MAX_UINT64 - range->offset)
1653 return false;
1654 return true;
1655 }
1656
1657 struct pnfs_layout_segment *
1658 pnfs_layout_process(struct nfs4_layoutget *lgp)
1659 {
1660 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1661 struct nfs4_layoutget_res *res = &lgp->res;
1662 struct pnfs_layout_segment *lseg;
1663 struct inode *ino = lo->plh_inode;
1664 LIST_HEAD(free_me);
1665 int status = -EINVAL;
1666
1667 if (!pnfs_sanity_check_layout_range(&res->range))
1668 goto out;
1669
1670 /* Inject layout blob into I/O device driver */
1671 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1672 if (!lseg || IS_ERR(lseg)) {
1673 if (!lseg)
1674 status = -ENOMEM;
1675 else
1676 status = PTR_ERR(lseg);
1677 dprintk("%s: Could not allocate layout: error %d\n",
1678 __func__, status);
1679 goto out;
1680 }
1681
1682 init_lseg(lo, lseg);
1683 lseg->pls_range = res->range;
1684
1685 spin_lock(&ino->i_lock);
1686 if (pnfs_layoutgets_blocked(lo)) {
1687 dprintk("%s forget reply due to state\n", __func__);
1688 goto out_forget_reply;
1689 }
1690
1691 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1692 /* existing state ID, make sure the sequence number matches. */
1693 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1694 dprintk("%s forget reply due to sequence\n", __func__);
1695 status = -EAGAIN;
1696 goto out_forget_reply;
1697 }
1698 pnfs_set_layout_stateid(lo, &res->stateid, false);
1699 } else {
1700 /*
1701 * We got an entirely new state ID. Mark all segments for the
1702 * inode invalid, and don't bother validating the stateid
1703 * sequence number.
1704 */
1705 pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL);
1706
1707 nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
1708 lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
1709 }
1710
1711 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1712
1713 pnfs_get_lseg(lseg);
1714 pnfs_layout_insert_lseg(lo, lseg, &free_me);
1715
1716 if (res->return_on_close)
1717 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1718
1719 spin_unlock(&ino->i_lock);
1720 pnfs_free_lseg_list(&free_me);
1721 return lseg;
1722 out:
1723 return ERR_PTR(status);
1724
1725 out_forget_reply:
1726 spin_unlock(&ino->i_lock);
1727 lseg->pls_layout = lo;
1728 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1729 goto out;
1730 }
1731
1732 static void
1733 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
1734 struct list_head *tmp_list,
1735 struct pnfs_layout_range *return_range)
1736 {
1737 struct pnfs_layout_segment *lseg, *next;
1738
1739 dprintk("%s:Begin lo %p\n", __func__, lo);
1740
1741 if (list_empty(&lo->plh_segs))
1742 return;
1743
1744 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
1745 if (should_free_lseg(&lseg->pls_range, return_range)) {
1746 dprintk("%s: marking lseg %p iomode %d "
1747 "offset %llu length %llu\n", __func__,
1748 lseg, lseg->pls_range.iomode,
1749 lseg->pls_range.offset,
1750 lseg->pls_range.length);
1751 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1752 mark_lseg_invalid(lseg, tmp_list);
1753 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1754 &lo->plh_flags);
1755 }
1756 }
1757
1758 void pnfs_error_mark_layout_for_return(struct inode *inode,
1759 struct pnfs_layout_segment *lseg)
1760 {
1761 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
1762 int iomode = pnfs_iomode_to_fail_bit(lseg->pls_range.iomode);
1763 struct pnfs_layout_range range = {
1764 .iomode = lseg->pls_range.iomode,
1765 .offset = 0,
1766 .length = NFS4_MAX_UINT64,
1767 };
1768 LIST_HEAD(free_me);
1769
1770 spin_lock(&inode->i_lock);
1771 /* set failure bit so that pnfs path will be retried later */
1772 pnfs_layout_set_fail_bit(lo, iomode);
1773 if (lo->plh_return_iomode == 0)
1774 lo->plh_return_iomode = range.iomode;
1775 else if (lo->plh_return_iomode != range.iomode)
1776 lo->plh_return_iomode = IOMODE_ANY;
1777 /*
1778 * mark all matching lsegs so that we are sure to have no live
1779 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1780 * for how it works.
1781 */
1782 pnfs_mark_matching_lsegs_return(lo, &free_me, &range);
1783 spin_unlock(&inode->i_lock);
1784 pnfs_free_lseg_list(&free_me);
1785 }
1786 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
1787
1788 void
1789 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1790 {
1791 u64 rd_size = req->wb_bytes;
1792
1793 if (pgio->pg_lseg == NULL) {
1794 if (pgio->pg_dreq == NULL)
1795 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
1796 else
1797 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1798
1799 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1800 req->wb_context,
1801 req_offset(req),
1802 rd_size,
1803 IOMODE_READ,
1804 GFP_KERNEL);
1805 }
1806 /* If no lseg, fall back to read through mds */
1807 if (pgio->pg_lseg == NULL)
1808 nfs_pageio_reset_read_mds(pgio);
1809
1810 }
1811 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1812
1813 void
1814 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
1815 struct nfs_page *req, u64 wb_size)
1816 {
1817 if (pgio->pg_lseg == NULL)
1818 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1819 req->wb_context,
1820 req_offset(req),
1821 wb_size,
1822 IOMODE_RW,
1823 GFP_NOFS);
1824 /* If no lseg, fall back to write through mds */
1825 if (pgio->pg_lseg == NULL)
1826 nfs_pageio_reset_write_mds(pgio);
1827 }
1828 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1829
1830 void
1831 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
1832 {
1833 if (desc->pg_lseg) {
1834 pnfs_put_lseg(desc->pg_lseg);
1835 desc->pg_lseg = NULL;
1836 }
1837 }
1838 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
1839
1840 /*
1841 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1842 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1843 */
1844 size_t
1845 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
1846 struct nfs_page *prev, struct nfs_page *req)
1847 {
1848 unsigned int size;
1849 u64 seg_end, req_start, seg_left;
1850
1851 size = nfs_generic_pg_test(pgio, prev, req);
1852 if (!size)
1853 return 0;
1854
1855 /*
1856 * 'size' contains the number of bytes left in the current page (up
1857 * to the original size asked for in @req->wb_bytes).
1858 *
1859 * Calculate how many bytes are left in the layout segment
1860 * and if there are less bytes than 'size', return that instead.
1861 *
1862 * Please also note that 'end_offset' is actually the offset of the
1863 * first byte that lies outside the pnfs_layout_range. FIXME?
1864 *
1865 */
1866 if (pgio->pg_lseg) {
1867 seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
1868 pgio->pg_lseg->pls_range.length);
1869 req_start = req_offset(req);
1870 WARN_ON_ONCE(req_start >= seg_end);
1871 /* start of request is past the last byte of this segment */
1872 if (req_start >= seg_end) {
1873 /* reference the new lseg */
1874 if (pgio->pg_ops->pg_cleanup)
1875 pgio->pg_ops->pg_cleanup(pgio);
1876 if (pgio->pg_ops->pg_init)
1877 pgio->pg_ops->pg_init(pgio, req);
1878 return 0;
1879 }
1880
1881 /* adjust 'size' iff there are fewer bytes left in the
1882 * segment than what nfs_generic_pg_test returned */
1883 seg_left = seg_end - req_start;
1884 if (seg_left < size)
1885 size = (unsigned int)seg_left;
1886 }
1887
1888 return size;
1889 }
1890 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1891
1892 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1893 {
1894 struct nfs_pageio_descriptor pgio;
1895
1896 /* Resend all requests through the MDS */
1897 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
1898 hdr->completion_ops);
1899 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
1900 return nfs_pageio_resend(&pgio, hdr);
1901 }
1902 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1903
1904 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1905 {
1906
1907 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1908 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1909 PNFS_LAYOUTRET_ON_ERROR) {
1910 pnfs_return_layout(hdr->inode);
1911 }
1912 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1913 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1914 }
1915
1916 /*
1917 * Called by non rpc-based layout drivers
1918 */
1919 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
1920 {
1921 if (likely(!hdr->pnfs_error)) {
1922 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1923 hdr->mds_offset + hdr->res.count);
1924 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
1925 }
1926 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
1927 if (unlikely(hdr->pnfs_error))
1928 pnfs_ld_handle_write_error(hdr);
1929 hdr->mds_ops->rpc_release(hdr);
1930 }
1931 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1932
1933 static void
1934 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1935 struct nfs_pgio_header *hdr)
1936 {
1937 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1938
1939 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1940 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
1941 nfs_pageio_reset_write_mds(desc);
1942 mirror->pg_recoalesce = 1;
1943 }
1944 nfs_pgio_data_destroy(hdr);
1945 hdr->release(hdr);
1946 }
1947
1948 static enum pnfs_try_status
1949 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
1950 const struct rpc_call_ops *call_ops,
1951 struct pnfs_layout_segment *lseg,
1952 int how)
1953 {
1954 struct inode *inode = hdr->inode;
1955 enum pnfs_try_status trypnfs;
1956 struct nfs_server *nfss = NFS_SERVER(inode);
1957
1958 hdr->mds_ops = call_ops;
1959
1960 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1961 inode->i_ino, hdr->args.count, hdr->args.offset, how);
1962 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
1963 if (trypnfs != PNFS_NOT_ATTEMPTED)
1964 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1965 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1966 return trypnfs;
1967 }
1968
1969 static void
1970 pnfs_do_write(struct nfs_pageio_descriptor *desc,
1971 struct nfs_pgio_header *hdr, int how)
1972 {
1973 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1974 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1975 enum pnfs_try_status trypnfs;
1976
1977 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
1978 if (trypnfs == PNFS_NOT_ATTEMPTED)
1979 pnfs_write_through_mds(desc, hdr);
1980 }
1981
1982 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
1983 {
1984 pnfs_put_lseg(hdr->lseg);
1985 nfs_pgio_header_free(hdr);
1986 }
1987
1988 int
1989 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1990 {
1991 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1992
1993 struct nfs_pgio_header *hdr;
1994 int ret;
1995
1996 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
1997 if (!hdr) {
1998 desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
1999 return -ENOMEM;
2000 }
2001 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2002
2003 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2004 ret = nfs_generic_pgio(desc, hdr);
2005 if (!ret)
2006 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2007
2008 return ret;
2009 }
2010 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2011
2012 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2013 {
2014 struct nfs_pageio_descriptor pgio;
2015
2016 /* Resend all requests through the MDS */
2017 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2018 return nfs_pageio_resend(&pgio, hdr);
2019 }
2020 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2021
2022 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2023 {
2024 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2025 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2026 PNFS_LAYOUTRET_ON_ERROR) {
2027 pnfs_return_layout(hdr->inode);
2028 }
2029 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2030 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2031 }
2032
2033 /*
2034 * Called by non rpc-based layout drivers
2035 */
2036 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2037 {
2038 if (likely(!hdr->pnfs_error)) {
2039 __nfs4_read_done_cb(hdr);
2040 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2041 }
2042 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2043 if (unlikely(hdr->pnfs_error))
2044 pnfs_ld_handle_read_error(hdr);
2045 hdr->mds_ops->rpc_release(hdr);
2046 }
2047 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2048
2049 static void
2050 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2051 struct nfs_pgio_header *hdr)
2052 {
2053 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2054
2055 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2056 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2057 nfs_pageio_reset_read_mds(desc);
2058 mirror->pg_recoalesce = 1;
2059 }
2060 nfs_pgio_data_destroy(hdr);
2061 hdr->release(hdr);
2062 }
2063
2064 /*
2065 * Call the appropriate parallel I/O subsystem read function.
2066 */
2067 static enum pnfs_try_status
2068 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2069 const struct rpc_call_ops *call_ops,
2070 struct pnfs_layout_segment *lseg)
2071 {
2072 struct inode *inode = hdr->inode;
2073 struct nfs_server *nfss = NFS_SERVER(inode);
2074 enum pnfs_try_status trypnfs;
2075
2076 hdr->mds_ops = call_ops;
2077
2078 dprintk("%s: Reading ino:%lu %u@%llu\n",
2079 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2080
2081 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2082 if (trypnfs != PNFS_NOT_ATTEMPTED)
2083 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2084 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2085 return trypnfs;
2086 }
2087
2088 /* Resend all requests through pnfs. */
2089 int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2090 {
2091 struct nfs_pageio_descriptor pgio;
2092
2093 nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
2094 return nfs_pageio_resend(&pgio, hdr);
2095 }
2096 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2097
2098 static void
2099 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2100 {
2101 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2102 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2103 enum pnfs_try_status trypnfs;
2104 int err = 0;
2105
2106 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2107 if (trypnfs == PNFS_TRY_AGAIN)
2108 err = pnfs_read_resend_pnfs(hdr);
2109 if (trypnfs == PNFS_NOT_ATTEMPTED || err)
2110 pnfs_read_through_mds(desc, hdr);
2111 }
2112
2113 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2114 {
2115 pnfs_put_lseg(hdr->lseg);
2116 nfs_pgio_header_free(hdr);
2117 }
2118
2119 int
2120 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2121 {
2122 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2123
2124 struct nfs_pgio_header *hdr;
2125 int ret;
2126
2127 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2128 if (!hdr) {
2129 desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
2130 return -ENOMEM;
2131 }
2132 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2133 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2134 ret = nfs_generic_pgio(desc, hdr);
2135 if (!ret)
2136 pnfs_do_read(desc, hdr);
2137 return ret;
2138 }
2139 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2140
2141 static void pnfs_clear_layoutcommitting(struct inode *inode)
2142 {
2143 unsigned long *bitlock = &NFS_I(inode)->flags;
2144
2145 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2146 smp_mb__after_atomic();
2147 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2148 }
2149
2150 /*
2151 * There can be multiple RW segments.
2152 */
2153 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2154 {
2155 struct pnfs_layout_segment *lseg;
2156
2157 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2158 if (lseg->pls_range.iomode == IOMODE_RW &&
2159 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2160 list_add(&lseg->pls_lc_list, listp);
2161 }
2162 }
2163
2164 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2165 {
2166 struct pnfs_layout_segment *lseg, *tmp;
2167
2168 /* Matched by references in pnfs_set_layoutcommit */
2169 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2170 list_del_init(&lseg->pls_lc_list);
2171 pnfs_put_lseg(lseg);
2172 }
2173
2174 pnfs_clear_layoutcommitting(inode);
2175 }
2176
2177 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2178 {
2179 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2180 }
2181 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2182
2183 void
2184 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2185 loff_t end_pos)
2186 {
2187 struct nfs_inode *nfsi = NFS_I(inode);
2188 bool mark_as_dirty = false;
2189
2190 spin_lock(&inode->i_lock);
2191 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2192 nfsi->layout->plh_lwb = end_pos;
2193 mark_as_dirty = true;
2194 dprintk("%s: Set layoutcommit for inode %lu ",
2195 __func__, inode->i_ino);
2196 } else if (end_pos > nfsi->layout->plh_lwb)
2197 nfsi->layout->plh_lwb = end_pos;
2198 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2199 /* references matched in nfs4_layoutcommit_release */
2200 pnfs_get_lseg(lseg);
2201 }
2202 spin_unlock(&inode->i_lock);
2203 dprintk("%s: lseg %p end_pos %llu\n",
2204 __func__, lseg, nfsi->layout->plh_lwb);
2205
2206 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2207 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2208 if (mark_as_dirty)
2209 mark_inode_dirty_sync(inode);
2210 }
2211 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2212
2213 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2214 {
2215 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2216
2217 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2218 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2219 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2220 }
2221
2222 /*
2223 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2224 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2225 * data to disk to allow the server to recover the data if it crashes.
2226 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2227 * is off, and a COMMIT is sent to a data server, or
2228 * if WRITEs to a data server return NFS_DATA_SYNC.
2229 */
2230 int
2231 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2232 {
2233 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2234 struct nfs4_layoutcommit_data *data;
2235 struct nfs_inode *nfsi = NFS_I(inode);
2236 loff_t end_pos;
2237 int status;
2238
2239 if (!pnfs_layoutcommit_outstanding(inode))
2240 return 0;
2241
2242 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2243
2244 status = -EAGAIN;
2245 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2246 if (!sync)
2247 goto out;
2248 status = wait_on_bit_lock_action(&nfsi->flags,
2249 NFS_INO_LAYOUTCOMMITTING,
2250 nfs_wait_bit_killable,
2251 TASK_KILLABLE);
2252 if (status)
2253 goto out;
2254 }
2255
2256 status = -ENOMEM;
2257 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2258 data = kzalloc(sizeof(*data), GFP_NOFS);
2259 if (!data)
2260 goto clear_layoutcommitting;
2261
2262 status = 0;
2263 spin_lock(&inode->i_lock);
2264 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2265 goto out_unlock;
2266
2267 INIT_LIST_HEAD(&data->lseg_list);
2268 pnfs_list_write_lseg(inode, &data->lseg_list);
2269
2270 end_pos = nfsi->layout->plh_lwb;
2271
2272 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2273 spin_unlock(&inode->i_lock);
2274
2275 data->args.inode = inode;
2276 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2277 nfs_fattr_init(&data->fattr);
2278 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2279 data->res.fattr = &data->fattr;
2280 data->args.lastbytewritten = end_pos - 1;
2281 data->res.server = NFS_SERVER(inode);
2282
2283 if (ld->prepare_layoutcommit) {
2284 status = ld->prepare_layoutcommit(&data->args);
2285 if (status) {
2286 put_rpccred(data->cred);
2287 spin_lock(&inode->i_lock);
2288 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2289 if (end_pos > nfsi->layout->plh_lwb)
2290 nfsi->layout->plh_lwb = end_pos;
2291 goto out_unlock;
2292 }
2293 }
2294
2295
2296 status = nfs4_proc_layoutcommit(data, sync);
2297 out:
2298 if (status)
2299 mark_inode_dirty_sync(inode);
2300 dprintk("<-- %s status %d\n", __func__, status);
2301 return status;
2302 out_unlock:
2303 spin_unlock(&inode->i_lock);
2304 kfree(data);
2305 clear_layoutcommitting:
2306 pnfs_clear_layoutcommitting(inode);
2307 goto out;
2308 }
2309 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2310
2311 int
2312 pnfs_generic_sync(struct inode *inode, bool datasync)
2313 {
2314 return pnfs_layoutcommit_inode(inode, true);
2315 }
2316 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2317
2318 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2319 {
2320 struct nfs4_threshold *thp;
2321
2322 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2323 if (!thp) {
2324 dprintk("%s mdsthreshold allocation failed\n", __func__);
2325 return NULL;
2326 }
2327 return thp;
2328 }
2329
2330 #if IS_ENABLED(CONFIG_NFS_V4_2)
2331 int
2332 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2333 {
2334 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2335 struct nfs_server *server = NFS_SERVER(inode);
2336 struct nfs_inode *nfsi = NFS_I(inode);
2337 struct nfs42_layoutstat_data *data;
2338 struct pnfs_layout_hdr *hdr;
2339 int status = 0;
2340
2341 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2342 goto out;
2343
2344 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2345 goto out;
2346
2347 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2348 goto out;
2349
2350 spin_lock(&inode->i_lock);
2351 if (!NFS_I(inode)->layout) {
2352 spin_unlock(&inode->i_lock);
2353 goto out;
2354 }
2355 hdr = NFS_I(inode)->layout;
2356 pnfs_get_layout_hdr(hdr);
2357 spin_unlock(&inode->i_lock);
2358
2359 data = kzalloc(sizeof(*data), gfp_flags);
2360 if (!data) {
2361 status = -ENOMEM;
2362 goto out_put;
2363 }
2364
2365 data->args.fh = NFS_FH(inode);
2366 data->args.inode = inode;
2367 nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
2368 status = ld->prepare_layoutstats(&data->args);
2369 if (status)
2370 goto out_free;
2371
2372 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2373
2374 out:
2375 dprintk("%s returns %d\n", __func__, status);
2376 return status;
2377
2378 out_free:
2379 kfree(data);
2380 out_put:
2381 pnfs_put_layout_hdr(hdr);
2382 smp_mb__before_atomic();
2383 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2384 smp_mb__after_atomic();
2385 goto out;
2386 }
2387 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2388 #endif
2389
2390 unsigned int layoutstats_timer;
2391 module_param(layoutstats_timer, uint, 0644);
2392 EXPORT_SYMBOL_GPL(layoutstats_timer);
Linux with added FPC-III support