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HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()
[linux/fpc-iii.git] / fs / nfs / pnfs.c
blobd34fb0feb5c2615592ab455b2d30aa940da00e35
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 /* Serialise LAYOUTGET/LAYOUTRETURN */
369 if (atomic_read(&lo->plh_outstanding) != 0)
370 return false;
371 if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
372 return false;
373 lo->plh_return_iomode = 0;
374 pnfs_get_layout_hdr(lo);
375 clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
376 return true;
377 }
378
379 static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment *lseg,
380 struct pnfs_layout_hdr *lo, struct inode *inode)
381 {
382 lo = lseg->pls_layout;
383 inode = lo->plh_inode;
384
385 spin_lock(&inode->i_lock);
386 if (pnfs_layout_need_return(lo, lseg)) {
387 nfs4_stateid stateid;
388 enum pnfs_iomode iomode;
389 bool send;
390
391 stateid = lo->plh_stateid;
392 iomode = lo->plh_return_iomode;
393 send = pnfs_prepare_layoutreturn(lo);
394 spin_unlock(&inode->i_lock);
395 if (send) {
396 /* Send an async layoutreturn so we dont deadlock */
397 pnfs_send_layoutreturn(lo, stateid, iomode, false);
398 }
399 } else
400 spin_unlock(&inode->i_lock);
401 }
402
403 void
404 pnfs_put_lseg(struct pnfs_layout_segment *lseg)
405 {
406 struct pnfs_layout_hdr *lo;
407 struct inode *inode;
408
409 if (!lseg)
410 return;
411
412 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
413 atomic_read(&lseg->pls_refcount),
414 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
415
416 /* Handle the case where refcount != 1 */
417 if (atomic_add_unless(&lseg->pls_refcount, -1, 1))
418 return;
419
420 lo = lseg->pls_layout;
421 inode = lo->plh_inode;
422 /* Do we need a layoutreturn? */
423 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
424 pnfs_layoutreturn_before_put_lseg(lseg, lo, inode);
425
426 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
427 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
428 spin_unlock(&inode->i_lock);
429 return;
430 }
431 pnfs_get_layout_hdr(lo);
432 pnfs_layout_remove_lseg(lo, lseg);
433 spin_unlock(&inode->i_lock);
434 pnfs_free_lseg(lseg);
435 pnfs_put_layout_hdr(lo);
436 }
437 }
438 EXPORT_SYMBOL_GPL(pnfs_put_lseg);
439
440 static void pnfs_free_lseg_async_work(struct work_struct *work)
441 {
442 struct pnfs_layout_segment *lseg;
443 struct pnfs_layout_hdr *lo;
444
445 lseg = container_of(work, struct pnfs_layout_segment, pls_work);
446 lo = lseg->pls_layout;
447
448 pnfs_free_lseg(lseg);
449 pnfs_put_layout_hdr(lo);
450 }
451
452 static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
453 {
454 INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
455 schedule_work(&lseg->pls_work);
456 }
457
458 void
459 pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
460 {
461 if (!lseg)
462 return;
463
464 assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
465
466 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
467 atomic_read(&lseg->pls_refcount),
468 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
469 if (atomic_dec_and_test(&lseg->pls_refcount)) {
470 struct pnfs_layout_hdr *lo = lseg->pls_layout;
471 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
472 return;
473 pnfs_get_layout_hdr(lo);
474 pnfs_layout_remove_lseg(lo, lseg);
475 pnfs_free_lseg_async(lseg);
476 }
477 }
478 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
479
480 static u64
481 end_offset(u64 start, u64 len)
482 {
483 u64 end;
484
485 end = start + len;
486 return end >= start ? end : NFS4_MAX_UINT64;
487 }
488
489 /*
490 * is l2 fully contained in l1?
491 * start1 end1
492 * [----------------------------------)
493 * start2 end2
494 * [----------------)
495 */
496 static bool
497 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1,
498 const struct pnfs_layout_range *l2)
499 {
500 u64 start1 = l1->offset;
501 u64 end1 = end_offset(start1, l1->length);
502 u64 start2 = l2->offset;
503 u64 end2 = end_offset(start2, l2->length);
504
505 return (start1 <= start2) && (end1 >= end2);
506 }
507
508 /*
509 * is l1 and l2 intersecting?
510 * start1 end1
511 * [----------------------------------)
512 * start2 end2
513 * [----------------)
514 */
515 static bool
516 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
517 const struct pnfs_layout_range *l2)
518 {
519 u64 start1 = l1->offset;
520 u64 end1 = end_offset(start1, l1->length);
521 u64 start2 = l2->offset;
522 u64 end2 = end_offset(start2, l2->length);
523
524 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
525 (end2 == NFS4_MAX_UINT64 || end2 > start1);
526 }
527
528 static bool
529 should_free_lseg(const struct pnfs_layout_range *lseg_range,
530 const struct pnfs_layout_range *recall_range)
531 {
532 return (recall_range->iomode == IOMODE_ANY ||
533 lseg_range->iomode == recall_range->iomode) &&
534 pnfs_lseg_range_intersecting(lseg_range, recall_range);
535 }
536
537 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg,
538 struct list_head *tmp_list)
539 {
540 if (!atomic_dec_and_test(&lseg->pls_refcount))
541 return false;
542 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
543 list_add(&lseg->pls_list, tmp_list);
544 return true;
545 }
546
547 /* Returns 1 if lseg is removed from list, 0 otherwise */
548 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
549 struct list_head *tmp_list)
550 {
551 int rv = 0;
552
553 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
554 /* Remove the reference keeping the lseg in the
555 * list. It will now be removed when all
556 * outstanding io is finished.
557 */
558 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
559 atomic_read(&lseg->pls_refcount));
560 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list))
561 rv = 1;
562 }
563 return rv;
564 }
565
566 /* Returns count of number of matching invalid lsegs remaining in list
567 * after call.
568 */
569 int
570 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
571 struct list_head *tmp_list,
572 struct pnfs_layout_range *recall_range)
573 {
574 struct pnfs_layout_segment *lseg, *next;
575 int invalid = 0, removed = 0;
576
577 dprintk("%s:Begin lo %p\n", __func__, lo);
578
579 if (list_empty(&lo->plh_segs))
580 return 0;
581 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
582 if (!recall_range ||
583 should_free_lseg(&lseg->pls_range, recall_range)) {
584 dprintk("%s: freeing lseg %p iomode %d "
585 "offset %llu length %llu\n", __func__,
586 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
587 lseg->pls_range.length);
588 invalid++;
589 removed += mark_lseg_invalid(lseg, tmp_list);
590 }
591 dprintk("%s:Return %i\n", __func__, invalid - removed);
592 return invalid - removed;
593 }
594
595 /* note free_me must contain lsegs from a single layout_hdr */
596 void
597 pnfs_free_lseg_list(struct list_head *free_me)
598 {
599 struct pnfs_layout_segment *lseg, *tmp;
600
601 if (list_empty(free_me))
602 return;
603
604 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
605 list_del(&lseg->pls_list);
606 pnfs_free_lseg(lseg);
607 }
608 }
609
610 void
611 pnfs_destroy_layout(struct nfs_inode *nfsi)
612 {
613 struct pnfs_layout_hdr *lo;
614 LIST_HEAD(tmp_list);
615
616 spin_lock(&nfsi->vfs_inode.i_lock);
617 lo = nfsi->layout;
618 if (lo) {
619 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
620 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
621 pnfs_get_layout_hdr(lo);
622 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
623 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
624 pnfs_clear_retry_layoutget(lo);
625 spin_unlock(&nfsi->vfs_inode.i_lock);
626 pnfs_free_lseg_list(&tmp_list);
627 pnfs_put_layout_hdr(lo);
628 } else
629 spin_unlock(&nfsi->vfs_inode.i_lock);
630 }
631 EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
632
633 static bool
634 pnfs_layout_add_bulk_destroy_list(struct inode *inode,
635 struct list_head *layout_list)
636 {
637 struct pnfs_layout_hdr *lo;
638 bool ret = false;
639
640 spin_lock(&inode->i_lock);
641 lo = NFS_I(inode)->layout;
642 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
643 pnfs_get_layout_hdr(lo);
644 list_add(&lo->plh_bulk_destroy, layout_list);
645 ret = true;
646 }
647 spin_unlock(&inode->i_lock);
648 return ret;
649 }
650
651 /* Caller must hold rcu_read_lock and clp->cl_lock */
652 static int
653 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
654 struct nfs_server *server,
655 struct list_head *layout_list)
656 {
657 struct pnfs_layout_hdr *lo, *next;
658 struct inode *inode;
659
660 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
661 inode = igrab(lo->plh_inode);
662 if (inode == NULL)
663 continue;
664 list_del_init(&lo->plh_layouts);
665 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
666 continue;
667 rcu_read_unlock();
668 spin_unlock(&clp->cl_lock);
669 iput(inode);
670 spin_lock(&clp->cl_lock);
671 rcu_read_lock();
672 return -EAGAIN;
673 }
674 return 0;
675 }
676
677 static int
678 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
679 bool is_bulk_recall)
680 {
681 struct pnfs_layout_hdr *lo;
682 struct inode *inode;
683 struct pnfs_layout_range range = {
684 .iomode = IOMODE_ANY,
685 .offset = 0,
686 .length = NFS4_MAX_UINT64,
687 };
688 LIST_HEAD(lseg_list);
689 int ret = 0;
690
691 while (!list_empty(layout_list)) {
692 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
693 plh_bulk_destroy);
694 dprintk("%s freeing layout for inode %lu\n", __func__,
695 lo->plh_inode->i_ino);
696 inode = lo->plh_inode;
697
698 pnfs_layoutcommit_inode(inode, false);
699
700 spin_lock(&inode->i_lock);
701 list_del_init(&lo->plh_bulk_destroy);
702 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
703 if (is_bulk_recall)
704 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
705 if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range))
706 ret = -EAGAIN;
707 spin_unlock(&inode->i_lock);
708 pnfs_free_lseg_list(&lseg_list);
709 pnfs_put_layout_hdr(lo);
710 iput(inode);
711 }
712 return ret;
713 }
714
715 int
716 pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
717 struct nfs_fsid *fsid,
718 bool is_recall)
719 {
720 struct nfs_server *server;
721 LIST_HEAD(layout_list);
722
723 spin_lock(&clp->cl_lock);
724 rcu_read_lock();
725 restart:
726 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
727 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
728 continue;
729 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
730 server,
731 &layout_list) != 0)
732 goto restart;
733 }
734 rcu_read_unlock();
735 spin_unlock(&clp->cl_lock);
736
737 if (list_empty(&layout_list))
738 return 0;
739 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
740 }
741
742 int
743 pnfs_destroy_layouts_byclid(struct nfs_client *clp,
744 bool is_recall)
745 {
746 struct nfs_server *server;
747 LIST_HEAD(layout_list);
748
749 spin_lock(&clp->cl_lock);
750 rcu_read_lock();
751 restart:
752 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
753 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
754 server,
755 &layout_list) != 0)
756 goto restart;
757 }
758 rcu_read_unlock();
759 spin_unlock(&clp->cl_lock);
760
761 if (list_empty(&layout_list))
762 return 0;
763 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
764 }
765
766 /*
767 * Called by the state manger to remove all layouts established under an
768 * expired lease.
769 */
770 void
771 pnfs_destroy_all_layouts(struct nfs_client *clp)
772 {
773 nfs4_deviceid_mark_client_invalid(clp);
774 nfs4_deviceid_purge_client(clp);
775
776 pnfs_destroy_layouts_byclid(clp, false);
777 }
778
779 /*
780 * Compare 2 layout stateid sequence ids, to see which is newer,
781 * taking into account wraparound issues.
782 */
783 static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
784 {
785 return (s32)(s1 - s2) > 0;
786 }
787
788 /* update lo->plh_stateid with new if is more recent */
789 void
790 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
791 bool update_barrier)
792 {
793 u32 oldseq, newseq, new_barrier;
794 int empty = list_empty(&lo->plh_segs);
795
796 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
797 newseq = be32_to_cpu(new->seqid);
798 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
799 nfs4_stateid_copy(&lo->plh_stateid, new);
800 if (update_barrier) {
801 new_barrier = be32_to_cpu(new->seqid);
802 } else {
803 /* Because of wraparound, we want to keep the barrier
804 * "close" to the current seqids.
805 */
806 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
807 }
808 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
809 lo->plh_barrier = new_barrier;
810 }
811 }
812
813 static bool
814 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
815 const nfs4_stateid *stateid)
816 {
817 u32 seqid = be32_to_cpu(stateid->seqid);
818
819 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
820 }
821
822 /* lget is set to 1 if called from inside send_layoutget call chain */
823 static bool
824 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo)
825 {
826 return lo->plh_block_lgets ||
827 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
828 }
829
830 int
831 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
832 struct pnfs_layout_range *range,
833 struct nfs4_state *open_state)
834 {
835 int status = 0;
836
837 dprintk("--> %s\n", __func__);
838 spin_lock(&lo->plh_inode->i_lock);
839 if (pnfs_layoutgets_blocked(lo)) {
840 status = -EAGAIN;
841 } else if (!nfs4_valid_open_stateid(open_state)) {
842 status = -EBADF;
843 } else if (list_empty(&lo->plh_segs) ||
844 test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
845 int seq;
846
847 do {
848 seq = read_seqbegin(&open_state->seqlock);
849 nfs4_stateid_copy(dst, &open_state->stateid);
850 } while (read_seqretry(&open_state->seqlock, seq));
851 } else
852 nfs4_stateid_copy(dst, &lo->plh_stateid);
853 spin_unlock(&lo->plh_inode->i_lock);
854 dprintk("<-- %s\n", __func__);
855 return status;
856 }
857
858 /*
859 * Get layout from server.
860 * for now, assume that whole file layouts are requested.
861 * arg->offset: 0
862 * arg->length: all ones
863 */
864 static struct pnfs_layout_segment *
865 send_layoutget(struct pnfs_layout_hdr *lo,
866 struct nfs_open_context *ctx,
867 struct pnfs_layout_range *range,
868 gfp_t gfp_flags)
869 {
870 struct inode *ino = lo->plh_inode;
871 struct nfs_server *server = NFS_SERVER(ino);
872 struct nfs4_layoutget *lgp;
873 struct pnfs_layout_segment *lseg;
874 loff_t i_size;
875
876 dprintk("--> %s\n", __func__);
877
878 /*
879 * Synchronously retrieve layout information from server and
880 * store in lseg. If we race with a concurrent seqid morphing
881 * op, then re-send the LAYOUTGET.
882 */
883 do {
884 lgp = kzalloc(sizeof(*lgp), gfp_flags);
885 if (lgp == NULL)
886 return NULL;
887
888 i_size = i_size_read(ino);
889
890 lgp->args.minlength = PAGE_CACHE_SIZE;
891 if (lgp->args.minlength > range->length)
892 lgp->args.minlength = range->length;
893 if (range->iomode == IOMODE_READ) {
894 if (range->offset >= i_size)
895 lgp->args.minlength = 0;
896 else if (i_size - range->offset < lgp->args.minlength)
897 lgp->args.minlength = i_size - range->offset;
898 }
899 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
900 lgp->args.range = *range;
901 lgp->args.type = server->pnfs_curr_ld->id;
902 lgp->args.inode = ino;
903 lgp->args.ctx = get_nfs_open_context(ctx);
904 lgp->gfp_flags = gfp_flags;
905 lgp->cred = lo->plh_lc_cred;
906
907 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
908 } while (lseg == ERR_PTR(-EAGAIN));
909
910 if (IS_ERR(lseg)) {
911 switch (PTR_ERR(lseg)) {
912 case -ERESTARTSYS:
913 case -EIO:
914 case -ENOSPC:
915 case -EROFS:
916 case -E2BIG:
917 break;
918 default:
919 return NULL;
920 }
921 } else
922 pnfs_layout_clear_fail_bit(lo,
923 pnfs_iomode_to_fail_bit(range->iomode));
924
925 return lseg;
926 }
927
928 static void pnfs_clear_layoutcommit(struct inode *inode,
929 struct list_head *head)
930 {
931 struct nfs_inode *nfsi = NFS_I(inode);
932 struct pnfs_layout_segment *lseg, *tmp;
933
934 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
935 return;
936 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) {
937 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
938 continue;
939 pnfs_lseg_dec_and_remove_zero(lseg, head);
940 }
941 }
942
943 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
944 {
945 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
946 smp_mb__after_atomic();
947 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
948 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
949 }
950
951 static int
952 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
953 enum pnfs_iomode iomode, bool sync)
954 {
955 struct inode *ino = lo->plh_inode;
956 struct nfs4_layoutreturn *lrp;
957 int status = 0;
958
959 lrp = kzalloc(sizeof(*lrp), GFP_NOFS);
960 if (unlikely(lrp == NULL)) {
961 status = -ENOMEM;
962 spin_lock(&ino->i_lock);
963 pnfs_clear_layoutreturn_waitbit(lo);
964 spin_unlock(&ino->i_lock);
965 pnfs_put_layout_hdr(lo);
966 goto out;
967 }
968
969 lrp->args.stateid = stateid;
970 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
971 lrp->args.inode = ino;
972 lrp->args.range.iomode = iomode;
973 lrp->args.range.offset = 0;
974 lrp->args.range.length = NFS4_MAX_UINT64;
975 lrp->args.layout = lo;
976 lrp->clp = NFS_SERVER(ino)->nfs_client;
977 lrp->cred = lo->plh_lc_cred;
978
979 status = nfs4_proc_layoutreturn(lrp, sync);
980 out:
981 dprintk("<-- %s status: %d\n", __func__, status);
982 return status;
983 }
984
985 /*
986 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
987 * when the layout segment list is empty.
988 *
989 * Note that a pnfs_layout_hdr can exist with an empty layout segment
990 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
991 * deviceid is marked invalid.
992 */
993 int
994 _pnfs_return_layout(struct inode *ino)
995 {
996 struct pnfs_layout_hdr *lo = NULL;
997 struct nfs_inode *nfsi = NFS_I(ino);
998 LIST_HEAD(tmp_list);
999 nfs4_stateid stateid;
1000 int status = 0, empty;
1001 bool send;
1002
1003 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
1004
1005 spin_lock(&ino->i_lock);
1006 lo = nfsi->layout;
1007 if (!lo) {
1008 spin_unlock(&ino->i_lock);
1009 dprintk("NFS: %s no layout to return\n", __func__);
1010 goto out;
1011 }
1012 stateid = nfsi->layout->plh_stateid;
1013 /* Reference matched in nfs4_layoutreturn_release */
1014 pnfs_get_layout_hdr(lo);
1015 empty = list_empty(&lo->plh_segs);
1016 pnfs_clear_layoutcommit(ino, &tmp_list);
1017 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
1018
1019 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
1020 struct pnfs_layout_range range = {
1021 .iomode = IOMODE_ANY,
1022 .offset = 0,
1023 .length = NFS4_MAX_UINT64,
1024 };
1025 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range);
1026 }
1027
1028 /* Don't send a LAYOUTRETURN if list was initially empty */
1029 if (empty) {
1030 spin_unlock(&ino->i_lock);
1031 dprintk("NFS: %s no layout segments to return\n", __func__);
1032 goto out_put_layout_hdr;
1033 }
1034
1035 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1036 send = pnfs_prepare_layoutreturn(lo);
1037 spin_unlock(&ino->i_lock);
1038 pnfs_free_lseg_list(&tmp_list);
1039 if (send)
1040 status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
1041 out_put_layout_hdr:
1042 pnfs_put_layout_hdr(lo);
1043 out:
1044 dprintk("<-- %s status: %d\n", __func__, status);
1045 return status;
1046 }
1047 EXPORT_SYMBOL_GPL(_pnfs_return_layout);
1048
1049 int
1050 pnfs_commit_and_return_layout(struct inode *inode)
1051 {
1052 struct pnfs_layout_hdr *lo;
1053 int ret;
1054
1055 spin_lock(&inode->i_lock);
1056 lo = NFS_I(inode)->layout;
1057 if (lo == NULL) {
1058 spin_unlock(&inode->i_lock);
1059 return 0;
1060 }
1061 pnfs_get_layout_hdr(lo);
1062 /* Block new layoutgets and read/write to ds */
1063 lo->plh_block_lgets++;
1064 spin_unlock(&inode->i_lock);
1065 filemap_fdatawait(inode->i_mapping);
1066 ret = pnfs_layoutcommit_inode(inode, true);
1067 if (ret == 0)
1068 ret = _pnfs_return_layout(inode);
1069 spin_lock(&inode->i_lock);
1070 lo->plh_block_lgets--;
1071 spin_unlock(&inode->i_lock);
1072 pnfs_put_layout_hdr(lo);
1073 return ret;
1074 }
1075
1076 bool pnfs_roc(struct inode *ino)
1077 {
1078 struct nfs_inode *nfsi = NFS_I(ino);
1079 struct nfs_open_context *ctx;
1080 struct nfs4_state *state;
1081 struct pnfs_layout_hdr *lo;
1082 struct pnfs_layout_segment *lseg, *tmp;
1083 nfs4_stateid stateid;
1084 LIST_HEAD(tmp_list);
1085 bool found = false, layoutreturn = false, roc = false;
1086
1087 spin_lock(&ino->i_lock);
1088 lo = nfsi->layout;
1089 if (!lo || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
1090 goto out_noroc;
1091
1092 /* no roc if we hold a delegation */
1093 if (nfs4_check_delegation(ino, FMODE_READ))
1094 goto out_noroc;
1095
1096 list_for_each_entry(ctx, &nfsi->open_files, list) {
1097 state = ctx->state;
1098 /* Don't return layout if there is open file state */
1099 if (state != NULL && state->state != 0)
1100 goto out_noroc;
1101 }
1102
1103 stateid = lo->plh_stateid;
1104 /* always send layoutreturn if being marked so */
1105 if (test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1106 &lo->plh_flags))
1107 layoutreturn = pnfs_prepare_layoutreturn(lo);
1108
1109 pnfs_clear_retry_layoutget(lo);
1110 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
1111 /* If we are sending layoutreturn, invalidate all valid lsegs */
1112 if (layoutreturn || test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
1113 mark_lseg_invalid(lseg, &tmp_list);
1114 found = true;
1115 }
1116 /* ROC in two conditions:
1117 * 1. there are ROC lsegs
1118 * 2. we don't send layoutreturn
1119 */
1120 if (found && !layoutreturn) {
1121 /* lo ref dropped in pnfs_roc_release() */
1122 pnfs_get_layout_hdr(lo);
1123 roc = true;
1124 }
1125
1126 out_noroc:
1127 spin_unlock(&ino->i_lock);
1128 pnfs_free_lseg_list(&tmp_list);
1129 pnfs_layoutcommit_inode(ino, true);
1130 if (layoutreturn)
1131 pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true);
1132 return roc;
1133 }
1134
1135 void pnfs_roc_release(struct inode *ino)
1136 {
1137 struct pnfs_layout_hdr *lo;
1138
1139 spin_lock(&ino->i_lock);
1140 lo = NFS_I(ino)->layout;
1141 pnfs_clear_layoutreturn_waitbit(lo);
1142 if (atomic_dec_and_test(&lo->plh_refcount)) {
1143 pnfs_detach_layout_hdr(lo);
1144 spin_unlock(&ino->i_lock);
1145 pnfs_free_layout_hdr(lo);
1146 } else
1147 spin_unlock(&ino->i_lock);
1148 }
1149
1150 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
1151 {
1152 struct pnfs_layout_hdr *lo;
1153
1154 spin_lock(&ino->i_lock);
1155 lo = NFS_I(ino)->layout;
1156 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
1157 lo->plh_barrier = barrier;
1158 spin_unlock(&ino->i_lock);
1159 trace_nfs4_layoutreturn_on_close(ino, 0);
1160 }
1161
1162 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
1163 {
1164 struct nfs_inode *nfsi = NFS_I(ino);
1165 struct pnfs_layout_hdr *lo;
1166 u32 current_seqid;
1167
1168 spin_lock(&ino->i_lock);
1169 lo = nfsi->layout;
1170 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
1171
1172 /* Since close does not return a layout stateid for use as
1173 * a barrier, we choose the worst-case barrier.
1174 */
1175 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
1176 spin_unlock(&ino->i_lock);
1177 }
1178
1179 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
1180 {
1181 struct nfs_inode *nfsi = NFS_I(ino);
1182 struct pnfs_layout_hdr *lo;
1183 bool sleep = false;
1184
1185 /* we might not have grabbed lo reference. so need to check under
1186 * i_lock */
1187 spin_lock(&ino->i_lock);
1188 lo = nfsi->layout;
1189 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1190 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
1191 sleep = true;
1192 }
1193 spin_unlock(&ino->i_lock);
1194 return sleep;
1195 }
1196
1197 /*
1198 * Compare two layout segments for sorting into layout cache.
1199 * We want to preferentially return RW over RO layouts, so ensure those
1200 * are seen first.
1201 */
1202 static s64
1203 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
1204 const struct pnfs_layout_range *l2)
1205 {
1206 s64 d;
1207
1208 /* high offset > low offset */
1209 d = l1->offset - l2->offset;
1210 if (d)
1211 return d;
1212
1213 /* short length > long length */
1214 d = l2->length - l1->length;
1215 if (d)
1216 return d;
1217
1218 /* read > read/write */
1219 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
1220 }
1221
1222 static bool
1223 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
1224 const struct pnfs_layout_range *l2)
1225 {
1226 return pnfs_lseg_range_cmp(l1, l2) > 0;
1227 }
1228
1229 static bool
1230 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg,
1231 struct pnfs_layout_segment *old)
1232 {
1233 return false;
1234 }
1235
1236 void
1237 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1238 struct pnfs_layout_segment *lseg,
1239 bool (*is_after)(const struct pnfs_layout_range *,
1240 const struct pnfs_layout_range *),
1241 bool (*do_merge)(struct pnfs_layout_segment *,
1242 struct pnfs_layout_segment *),
1243 struct list_head *free_me)
1244 {
1245 struct pnfs_layout_segment *lp, *tmp;
1246
1247 dprintk("%s:Begin\n", __func__);
1248
1249 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) {
1250 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0)
1251 continue;
1252 if (do_merge(lseg, lp)) {
1253 mark_lseg_invalid(lp, free_me);
1254 continue;
1255 }
1256 if (is_after(&lseg->pls_range, &lp->pls_range))
1257 continue;
1258 list_add_tail(&lseg->pls_list, &lp->pls_list);
1259 dprintk("%s: inserted lseg %p "
1260 "iomode %d offset %llu length %llu before "
1261 "lp %p iomode %d offset %llu length %llu\n",
1262 __func__, lseg, lseg->pls_range.iomode,
1263 lseg->pls_range.offset, lseg->pls_range.length,
1264 lp, lp->pls_range.iomode, lp->pls_range.offset,
1265 lp->pls_range.length);
1266 goto out;
1267 }
1268 list_add_tail(&lseg->pls_list, &lo->plh_segs);
1269 dprintk("%s: inserted lseg %p "
1270 "iomode %d offset %llu length %llu at tail\n",
1271 __func__, lseg, lseg->pls_range.iomode,
1272 lseg->pls_range.offset, lseg->pls_range.length);
1273 out:
1274 pnfs_get_layout_hdr(lo);
1275
1276 dprintk("%s:Return\n", __func__);
1277 }
1278 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg);
1279
1280 static void
1281 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
1282 struct pnfs_layout_segment *lseg,
1283 struct list_head *free_me)
1284 {
1285 struct inode *inode = lo->plh_inode;
1286 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
1287
1288 if (ld->add_lseg != NULL)
1289 ld->add_lseg(lo, lseg, free_me);
1290 else
1291 pnfs_generic_layout_insert_lseg(lo, lseg,
1292 pnfs_lseg_range_is_after,
1293 pnfs_lseg_no_merge,
1294 free_me);
1295 }
1296
1297 static struct pnfs_layout_hdr *
1298 alloc_init_layout_hdr(struct inode *ino,
1299 struct nfs_open_context *ctx,
1300 gfp_t gfp_flags)
1301 {
1302 struct pnfs_layout_hdr *lo;
1303
1304 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
1305 if (!lo)
1306 return NULL;
1307 atomic_set(&lo->plh_refcount, 1);
1308 INIT_LIST_HEAD(&lo->plh_layouts);
1309 INIT_LIST_HEAD(&lo->plh_segs);
1310 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1311 lo->plh_inode = ino;
1312 lo->plh_lc_cred = get_rpccred(ctx->cred);
1313 return lo;
1314 }
1315
1316 static struct pnfs_layout_hdr *
1317 pnfs_find_alloc_layout(struct inode *ino,
1318 struct nfs_open_context *ctx,
1319 gfp_t gfp_flags)
1320 {
1321 struct nfs_inode *nfsi = NFS_I(ino);
1322 struct pnfs_layout_hdr *new = NULL;
1323
1324 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1325
1326 if (nfsi->layout != NULL)
1327 goto out_existing;
1328 spin_unlock(&ino->i_lock);
1329 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1330 spin_lock(&ino->i_lock);
1331
1332 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1333 nfsi->layout = new;
1334 return new;
1335 } else if (new != NULL)
1336 pnfs_free_layout_hdr(new);
1337 out_existing:
1338 pnfs_get_layout_hdr(nfsi->layout);
1339 return nfsi->layout;
1340 }
1341
1342 /*
1343 * iomode matching rules:
1344 * iomode lseg match
1345 * ----- ----- -----
1346 * ANY READ true
1347 * ANY RW true
1348 * RW READ false
1349 * RW RW true
1350 * READ READ true
1351 * READ RW true
1352 */
1353 static bool
1354 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range,
1355 const struct pnfs_layout_range *range)
1356 {
1357 struct pnfs_layout_range range1;
1358
1359 if ((range->iomode == IOMODE_RW &&
1360 ls_range->iomode != IOMODE_RW) ||
1361 !pnfs_lseg_range_intersecting(ls_range, range))
1362 return 0;
1363
1364 /* range1 covers only the first byte in the range */
1365 range1 = *range;
1366 range1.length = 1;
1367 return pnfs_lseg_range_contained(ls_range, &range1);
1368 }
1369
1370 /*
1371 * lookup range in layout
1372 */
1373 static struct pnfs_layout_segment *
1374 pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1375 struct pnfs_layout_range *range)
1376 {
1377 struct pnfs_layout_segment *lseg, *ret = NULL;
1378
1379 dprintk("%s:Begin\n", __func__);
1380
1381 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1382 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1383 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) &&
1384 pnfs_lseg_range_match(&lseg->pls_range, range)) {
1385 ret = pnfs_get_lseg(lseg);
1386 break;
1387 }
1388 }
1389
1390 dprintk("%s:Return lseg %p ref %d\n",
1391 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1392 return ret;
1393 }
1394
1395 /*
1396 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1397 * to the MDS or over pNFS
1398 *
1399 * The nfs_inode read_io and write_io fields are cumulative counters reset
1400 * when there are no layout segments. Note that in pnfs_update_layout iomode
1401 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1402 * WRITE request.
1403 *
1404 * A return of true means use MDS I/O.
1405 *
1406 * From rfc 5661:
1407 * If a file's size is smaller than the file size threshold, data accesses
1408 * SHOULD be sent to the metadata server. If an I/O request has a length that
1409 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1410 * server. If both file size and I/O size are provided, the client SHOULD
1411 * reach or exceed both thresholds before sending its read or write
1412 * requests to the data server.
1413 */
1414 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1415 struct inode *ino, int iomode)
1416 {
1417 struct nfs4_threshold *t = ctx->mdsthreshold;
1418 struct nfs_inode *nfsi = NFS_I(ino);
1419 loff_t fsize = i_size_read(ino);
1420 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1421
1422 if (t == NULL)
1423 return ret;
1424
1425 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1426 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1427
1428 switch (iomode) {
1429 case IOMODE_READ:
1430 if (t->bm & THRESHOLD_RD) {
1431 dprintk("%s fsize %llu\n", __func__, fsize);
1432 size_set = true;
1433 if (fsize < t->rd_sz)
1434 size = true;
1435 }
1436 if (t->bm & THRESHOLD_RD_IO) {
1437 dprintk("%s nfsi->read_io %llu\n", __func__,
1438 nfsi->read_io);
1439 io_set = true;
1440 if (nfsi->read_io < t->rd_io_sz)
1441 io = true;
1442 }
1443 break;
1444 case IOMODE_RW:
1445 if (t->bm & THRESHOLD_WR) {
1446 dprintk("%s fsize %llu\n", __func__, fsize);
1447 size_set = true;
1448 if (fsize < t->wr_sz)
1449 size = true;
1450 }
1451 if (t->bm & THRESHOLD_WR_IO) {
1452 dprintk("%s nfsi->write_io %llu\n", __func__,
1453 nfsi->write_io);
1454 io_set = true;
1455 if (nfsi->write_io < t->wr_io_sz)
1456 io = true;
1457 }
1458 break;
1459 }
1460 if (size_set && io_set) {
1461 if (size && io)
1462 ret = true;
1463 } else if (size || io)
1464 ret = true;
1465
1466 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1467 return ret;
1468 }
1469
1470 /* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */
1471 static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key, int mode)
1472 {
1473 if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags))
1474 return 1;
1475 return nfs_wait_bit_killable(key, mode);
1476 }
1477
1478 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo)
1479 {
1480 if (!pnfs_should_retry_layoutget(lo))
1481 return false;
1482 /*
1483 * send layoutcommit as it can hold up layoutreturn due to lseg
1484 * reference
1485 */
1486 pnfs_layoutcommit_inode(lo->plh_inode, false);
1487 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,
1488 pnfs_layoutget_retry_bit_wait,
1489 TASK_UNINTERRUPTIBLE);
1490 }
1491
1492 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo)
1493 {
1494 unsigned long *bitlock = &lo->plh_flags;
1495
1496 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock);
1497 smp_mb__after_atomic();
1498 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET);
1499 }
1500
1501 /*
1502 * Layout segment is retreived from the server if not cached.
1503 * The appropriate layout segment is referenced and returned to the caller.
1504 */
1505 struct pnfs_layout_segment *
1506 pnfs_update_layout(struct inode *ino,
1507 struct nfs_open_context *ctx,
1508 loff_t pos,
1509 u64 count,
1510 enum pnfs_iomode iomode,
1511 gfp_t gfp_flags)
1512 {
1513 struct pnfs_layout_range arg = {
1514 .iomode = iomode,
1515 .offset = pos,
1516 .length = count,
1517 };
1518 unsigned pg_offset;
1519 struct nfs_server *server = NFS_SERVER(ino);
1520 struct nfs_client *clp = server->nfs_client;
1521 struct pnfs_layout_hdr *lo;
1522 struct pnfs_layout_segment *lseg = NULL;
1523 bool first;
1524
1525 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
1526 goto out;
1527
1528 if (iomode == IOMODE_READ && i_size_read(ino) == 0)
1529 goto out;
1530
1531 if (pnfs_within_mdsthreshold(ctx, ino, iomode))
1532 goto out;
1533
1534 lookup_again:
1535 nfs4_client_recover_expired_lease(clp);
1536 first = false;
1537 spin_lock(&ino->i_lock);
1538 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1539 if (lo == NULL) {
1540 spin_unlock(&ino->i_lock);
1541 goto out;
1542 }
1543
1544 /* Do we even need to bother with this? */
1545 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1546 dprintk("%s matches recall, use MDS\n", __func__);
1547 goto out_unlock;
1548 }
1549
1550 /* if LAYOUTGET already failed once we don't try again */
1551 if (pnfs_layout_io_test_failed(lo, iomode) &&
1552 !pnfs_should_retry_layoutget(lo))
1553 goto out_unlock;
1554
1555 first = list_empty(&lo->plh_segs);
1556 if (first) {
1557 /* The first layoutget for the file. Need to serialize per
1558 * RFC 5661 Errata 3208.
1559 */
1560 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET,
1561 &lo->plh_flags)) {
1562 spin_unlock(&ino->i_lock);
1563 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET,
1564 TASK_UNINTERRUPTIBLE);
1565 pnfs_put_layout_hdr(lo);
1566 goto lookup_again;
1567 }
1568 } else {
1569 /* Check to see if the layout for the given range
1570 * already exists
1571 */
1572 lseg = pnfs_find_lseg(lo, &arg);
1573 if (lseg)
1574 goto out_unlock;
1575 }
1576
1577 /*
1578 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1579 * for LAYOUTRETURN even if first is true.
1580 */
1581 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
1582 spin_unlock(&ino->i_lock);
1583 dprintk("%s wait for layoutreturn\n", __func__);
1584 if (pnfs_prepare_to_retry_layoutget(lo)) {
1585 if (first)
1586 pnfs_clear_first_layoutget(lo);
1587 pnfs_put_layout_hdr(lo);
1588 dprintk("%s retrying\n", __func__);
1589 goto lookup_again;
1590 }
1591 goto out_put_layout_hdr;
1592 }
1593
1594 if (pnfs_layoutgets_blocked(lo))
1595 goto out_unlock;
1596 atomic_inc(&lo->plh_outstanding);
1597 spin_unlock(&ino->i_lock);
1598
1599 if (list_empty(&lo->plh_layouts)) {
1600 /* The lo must be on the clp list if there is any
1601 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1602 */
1603 spin_lock(&clp->cl_lock);
1604 if (list_empty(&lo->plh_layouts))
1605 list_add_tail(&lo->plh_layouts, &server->layouts);
1606 spin_unlock(&clp->cl_lock);
1607 }
1608
1609 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1610 if (pg_offset) {
1611 arg.offset -= pg_offset;
1612 arg.length += pg_offset;
1613 }
1614 if (arg.length != NFS4_MAX_UINT64)
1615 arg.length = PAGE_CACHE_ALIGN(arg.length);
1616
1617 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1618 pnfs_clear_retry_layoutget(lo);
1619 atomic_dec(&lo->plh_outstanding);
1620 out_put_layout_hdr:
1621 if (first)
1622 pnfs_clear_first_layoutget(lo);
1623 pnfs_put_layout_hdr(lo);
1624 out:
1625 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1626 "(%s, offset: %llu, length: %llu)\n",
1627 __func__, ino->i_sb->s_id,
1628 (unsigned long long)NFS_FILEID(ino),
1629 IS_ERR_OR_NULL(lseg) ? "not found" : "found",
1630 iomode==IOMODE_RW ? "read/write" : "read-only",
1631 (unsigned long long)pos,
1632 (unsigned long long)count);
1633 return lseg;
1634 out_unlock:
1635 spin_unlock(&ino->i_lock);
1636 goto out_put_layout_hdr;
1637 }
1638 EXPORT_SYMBOL_GPL(pnfs_update_layout);
1639
1640 static bool
1641 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range)
1642 {
1643 switch (range->iomode) {
1644 case IOMODE_READ:
1645 case IOMODE_RW:
1646 break;
1647 default:
1648 return false;
1649 }
1650 if (range->offset == NFS4_MAX_UINT64)
1651 return false;
1652 if (range->length == 0)
1653 return false;
1654 if (range->length != NFS4_MAX_UINT64 &&
1655 range->length > NFS4_MAX_UINT64 - range->offset)
1656 return false;
1657 return true;
1658 }
1659
1660 struct pnfs_layout_segment *
1661 pnfs_layout_process(struct nfs4_layoutget *lgp)
1662 {
1663 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1664 struct nfs4_layoutget_res *res = &lgp->res;
1665 struct pnfs_layout_segment *lseg;
1666 struct inode *ino = lo->plh_inode;
1667 LIST_HEAD(free_me);
1668 int status = -EINVAL;
1669
1670 if (!pnfs_sanity_check_layout_range(&res->range))
1671 goto out;
1672
1673 /* Inject layout blob into I/O device driver */
1674 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1675 if (!lseg || IS_ERR(lseg)) {
1676 if (!lseg)
1677 status = -ENOMEM;
1678 else
1679 status = PTR_ERR(lseg);
1680 dprintk("%s: Could not allocate layout: error %d\n",
1681 __func__, status);
1682 goto out;
1683 }
1684
1685 init_lseg(lo, lseg);
1686 lseg->pls_range = res->range;
1687
1688 spin_lock(&ino->i_lock);
1689 if (pnfs_layoutgets_blocked(lo)) {
1690 dprintk("%s forget reply due to state\n", __func__);
1691 goto out_forget_reply;
1692 }
1693
1694 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) {
1695 /* existing state ID, make sure the sequence number matches. */
1696 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1697 dprintk("%s forget reply due to sequence\n", __func__);
1698 status = -EAGAIN;
1699 goto out_forget_reply;
1700 }
1701 pnfs_set_layout_stateid(lo, &res->stateid, false);
1702 } else {
1703 /*
1704 * We got an entirely new state ID. Mark all segments for the
1705 * inode invalid, and don't bother validating the stateid
1706 * sequence number.
1707 */
1708 pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL);
1709
1710 nfs4_stateid_copy(&lo->plh_stateid, &res->stateid);
1711 lo->plh_barrier = be32_to_cpu(res->stateid.seqid);
1712 }
1713
1714 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
1715
1716 pnfs_get_lseg(lseg);
1717 pnfs_layout_insert_lseg(lo, lseg, &free_me);
1718
1719 if (res->return_on_close)
1720 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1721
1722 spin_unlock(&ino->i_lock);
1723 pnfs_free_lseg_list(&free_me);
1724 return lseg;
1725 out:
1726 return ERR_PTR(status);
1727
1728 out_forget_reply:
1729 spin_unlock(&ino->i_lock);
1730 lseg->pls_layout = lo;
1731 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1732 goto out;
1733 }
1734
1735 static void
1736 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
1737 struct list_head *tmp_list,
1738 struct pnfs_layout_range *return_range)
1739 {
1740 struct pnfs_layout_segment *lseg, *next;
1741
1742 dprintk("%s:Begin lo %p\n", __func__, lo);
1743
1744 if (list_empty(&lo->plh_segs))
1745 return;
1746
1747 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
1748 if (should_free_lseg(&lseg->pls_range, return_range)) {
1749 dprintk("%s: marking lseg %p iomode %d "
1750 "offset %llu length %llu\n", __func__,
1751 lseg, lseg->pls_range.iomode,
1752 lseg->pls_range.offset,
1753 lseg->pls_range.length);
1754 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
1755 mark_lseg_invalid(lseg, tmp_list);
1756 set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE,
1757 &lo->plh_flags);
1758 }
1759 }
1760
1761 void pnfs_error_mark_layout_for_return(struct inode *inode,
1762 struct pnfs_layout_segment *lseg)
1763 {
1764 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout;
1765 int iomode = pnfs_iomode_to_fail_bit(lseg->pls_range.iomode);
1766 struct pnfs_layout_range range = {
1767 .iomode = lseg->pls_range.iomode,
1768 .offset = 0,
1769 .length = NFS4_MAX_UINT64,
1770 };
1771 LIST_HEAD(free_me);
1772
1773 spin_lock(&inode->i_lock);
1774 /* set failure bit so that pnfs path will be retried later */
1775 pnfs_layout_set_fail_bit(lo, iomode);
1776 if (lo->plh_return_iomode == 0)
1777 lo->plh_return_iomode = range.iomode;
1778 else if (lo->plh_return_iomode != range.iomode)
1779 lo->plh_return_iomode = IOMODE_ANY;
1780 /*
1781 * mark all matching lsegs so that we are sure to have no live
1782 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1783 * for how it works.
1784 */
1785 pnfs_mark_matching_lsegs_return(lo, &free_me, &range);
1786 spin_unlock(&inode->i_lock);
1787 pnfs_free_lseg_list(&free_me);
1788 }
1789 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
1790
1791 void
1792 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1793 {
1794 u64 rd_size = req->wb_bytes;
1795
1796 if (pgio->pg_lseg == NULL) {
1797 if (pgio->pg_dreq == NULL)
1798 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
1799 else
1800 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1801
1802 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1803 req->wb_context,
1804 req_offset(req),
1805 rd_size,
1806 IOMODE_READ,
1807 GFP_KERNEL);
1808 if (IS_ERR(pgio->pg_lseg)) {
1809 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1810 pgio->pg_lseg = NULL;
1811 return;
1812 }
1813 }
1814 /* If no lseg, fall back to read through mds */
1815 if (pgio->pg_lseg == NULL)
1816 nfs_pageio_reset_read_mds(pgio);
1817
1818 }
1819 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1820
1821 void
1822 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
1823 struct nfs_page *req, u64 wb_size)
1824 {
1825 if (pgio->pg_lseg == NULL) {
1826 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1827 req->wb_context,
1828 req_offset(req),
1829 wb_size,
1830 IOMODE_RW,
1831 GFP_NOFS);
1832 if (IS_ERR(pgio->pg_lseg)) {
1833 pgio->pg_error = PTR_ERR(pgio->pg_lseg);
1834 pgio->pg_lseg = NULL;
1835 return;
1836 }
1837 }
1838 /* If no lseg, fall back to write through mds */
1839 if (pgio->pg_lseg == NULL)
1840 nfs_pageio_reset_write_mds(pgio);
1841 }
1842 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1843
1844 void
1845 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc)
1846 {
1847 if (desc->pg_lseg) {
1848 pnfs_put_lseg(desc->pg_lseg);
1849 desc->pg_lseg = NULL;
1850 }
1851 }
1852 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup);
1853
1854 /*
1855 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1856 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1857 */
1858 size_t
1859 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
1860 struct nfs_page *prev, struct nfs_page *req)
1861 {
1862 unsigned int size;
1863 u64 seg_end, req_start, seg_left;
1864
1865 size = nfs_generic_pg_test(pgio, prev, req);
1866 if (!size)
1867 return 0;
1868
1869 /*
1870 * 'size' contains the number of bytes left in the current page (up
1871 * to the original size asked for in @req->wb_bytes).
1872 *
1873 * Calculate how many bytes are left in the layout segment
1874 * and if there are less bytes than 'size', return that instead.
1875 *
1876 * Please also note that 'end_offset' is actually the offset of the
1877 * first byte that lies outside the pnfs_layout_range. FIXME?
1878 *
1879 */
1880 if (pgio->pg_lseg) {
1881 seg_end = end_offset(pgio->pg_lseg->pls_range.offset,
1882 pgio->pg_lseg->pls_range.length);
1883 req_start = req_offset(req);
1884 WARN_ON_ONCE(req_start >= seg_end);
1885 /* start of request is past the last byte of this segment */
1886 if (req_start >= seg_end) {
1887 /* reference the new lseg */
1888 if (pgio->pg_ops->pg_cleanup)
1889 pgio->pg_ops->pg_cleanup(pgio);
1890 if (pgio->pg_ops->pg_init)
1891 pgio->pg_ops->pg_init(pgio, req);
1892 return 0;
1893 }
1894
1895 /* adjust 'size' iff there are fewer bytes left in the
1896 * segment than what nfs_generic_pg_test returned */
1897 seg_left = seg_end - req_start;
1898 if (seg_left < size)
1899 size = (unsigned int)seg_left;
1900 }
1901
1902 return size;
1903 }
1904 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1905
1906 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr)
1907 {
1908 struct nfs_pageio_descriptor pgio;
1909
1910 /* Resend all requests through the MDS */
1911 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true,
1912 hdr->completion_ops);
1913 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags);
1914 return nfs_pageio_resend(&pgio, hdr);
1915 }
1916 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1917
1918 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr)
1919 {
1920
1921 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1922 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1923 PNFS_LAYOUTRET_ON_ERROR) {
1924 pnfs_return_layout(hdr->inode);
1925 }
1926 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1927 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr);
1928 }
1929
1930 /*
1931 * Called by non rpc-based layout drivers
1932 */
1933 void pnfs_ld_write_done(struct nfs_pgio_header *hdr)
1934 {
1935 if (likely(!hdr->pnfs_error)) {
1936 pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
1937 hdr->mds_offset + hdr->res.count);
1938 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
1939 }
1940 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error);
1941 if (unlikely(hdr->pnfs_error))
1942 pnfs_ld_handle_write_error(hdr);
1943 hdr->mds_ops->rpc_release(hdr);
1944 }
1945 EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1946
1947 static void
1948 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1949 struct nfs_pgio_header *hdr)
1950 {
1951 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
1952
1953 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1954 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
1955 nfs_pageio_reset_write_mds(desc);
1956 mirror->pg_recoalesce = 1;
1957 }
1958 hdr->completion_ops->completion(hdr);
1959 }
1960
1961 static enum pnfs_try_status
1962 pnfs_try_to_write_data(struct nfs_pgio_header *hdr,
1963 const struct rpc_call_ops *call_ops,
1964 struct pnfs_layout_segment *lseg,
1965 int how)
1966 {
1967 struct inode *inode = hdr->inode;
1968 enum pnfs_try_status trypnfs;
1969 struct nfs_server *nfss = NFS_SERVER(inode);
1970
1971 hdr->mds_ops = call_ops;
1972
1973 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1974 inode->i_ino, hdr->args.count, hdr->args.offset, how);
1975 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how);
1976 if (trypnfs != PNFS_NOT_ATTEMPTED)
1977 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1978 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1979 return trypnfs;
1980 }
1981
1982 static void
1983 pnfs_do_write(struct nfs_pageio_descriptor *desc,
1984 struct nfs_pgio_header *hdr, int how)
1985 {
1986 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1987 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1988 enum pnfs_try_status trypnfs;
1989
1990 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how);
1991 if (trypnfs == PNFS_NOT_ATTEMPTED)
1992 pnfs_write_through_mds(desc, hdr);
1993 }
1994
1995 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
1996 {
1997 pnfs_put_lseg(hdr->lseg);
1998 nfs_pgio_header_free(hdr);
1999 }
2000
2001 int
2002 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
2003 {
2004 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2005
2006 struct nfs_pgio_header *hdr;
2007 int ret;
2008
2009 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2010 if (!hdr) {
2011 desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
2012 return -ENOMEM;
2013 }
2014 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
2015
2016 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2017 ret = nfs_generic_pgio(desc, hdr);
2018 if (!ret)
2019 pnfs_do_write(desc, hdr, desc->pg_ioflags);
2020
2021 return ret;
2022 }
2023 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
2024
2025 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr)
2026 {
2027 struct nfs_pageio_descriptor pgio;
2028
2029 /* Resend all requests through the MDS */
2030 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops);
2031 return nfs_pageio_resend(&pgio, hdr);
2032 }
2033 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
2034
2035 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr)
2036 {
2037 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
2038 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
2039 PNFS_LAYOUTRET_ON_ERROR) {
2040 pnfs_return_layout(hdr->inode);
2041 }
2042 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
2043 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr);
2044 }
2045
2046 /*
2047 * Called by non rpc-based layout drivers
2048 */
2049 void pnfs_ld_read_done(struct nfs_pgio_header *hdr)
2050 {
2051 if (likely(!hdr->pnfs_error)) {
2052 __nfs4_read_done_cb(hdr);
2053 hdr->mds_ops->rpc_call_done(&hdr->task, hdr);
2054 }
2055 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error);
2056 if (unlikely(hdr->pnfs_error))
2057 pnfs_ld_handle_read_error(hdr);
2058 hdr->mds_ops->rpc_release(hdr);
2059 }
2060 EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
2061
2062 static void
2063 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
2064 struct nfs_pgio_header *hdr)
2065 {
2066 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2067
2068 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
2069 list_splice_tail_init(&hdr->pages, &mirror->pg_list);
2070 nfs_pageio_reset_read_mds(desc);
2071 mirror->pg_recoalesce = 1;
2072 }
2073 hdr->completion_ops->completion(hdr);
2074 }
2075
2076 /*
2077 * Call the appropriate parallel I/O subsystem read function.
2078 */
2079 static enum pnfs_try_status
2080 pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
2081 const struct rpc_call_ops *call_ops,
2082 struct pnfs_layout_segment *lseg)
2083 {
2084 struct inode *inode = hdr->inode;
2085 struct nfs_server *nfss = NFS_SERVER(inode);
2086 enum pnfs_try_status trypnfs;
2087
2088 hdr->mds_ops = call_ops;
2089
2090 dprintk("%s: Reading ino:%lu %u@%llu\n",
2091 __func__, inode->i_ino, hdr->args.count, hdr->args.offset);
2092
2093 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr);
2094 if (trypnfs != PNFS_NOT_ATTEMPTED)
2095 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
2096 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
2097 return trypnfs;
2098 }
2099
2100 /* Resend all requests through pnfs. */
2101 int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
2102 {
2103 struct nfs_pageio_descriptor pgio;
2104
2105 nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
2106 return nfs_pageio_resend(&pgio, hdr);
2107 }
2108 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
2109
2110 static void
2111 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
2112 {
2113 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
2114 struct pnfs_layout_segment *lseg = desc->pg_lseg;
2115 enum pnfs_try_status trypnfs;
2116 int err = 0;
2117
2118 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
2119 if (trypnfs == PNFS_TRY_AGAIN)
2120 err = pnfs_read_resend_pnfs(hdr);
2121 if (trypnfs == PNFS_NOT_ATTEMPTED || err)
2122 pnfs_read_through_mds(desc, hdr);
2123 }
2124
2125 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
2126 {
2127 pnfs_put_lseg(hdr->lseg);
2128 nfs_pgio_header_free(hdr);
2129 }
2130
2131 int
2132 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
2133 {
2134 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
2135
2136 struct nfs_pgio_header *hdr;
2137 int ret;
2138
2139 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
2140 if (!hdr) {
2141 desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
2142 return -ENOMEM;
2143 }
2144 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
2145 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
2146 ret = nfs_generic_pgio(desc, hdr);
2147 if (!ret)
2148 pnfs_do_read(desc, hdr);
2149 return ret;
2150 }
2151 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
2152
2153 static void pnfs_clear_layoutcommitting(struct inode *inode)
2154 {
2155 unsigned long *bitlock = &NFS_I(inode)->flags;
2156
2157 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
2158 smp_mb__after_atomic();
2159 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
2160 }
2161
2162 /*
2163 * There can be multiple RW segments.
2164 */
2165 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
2166 {
2167 struct pnfs_layout_segment *lseg;
2168
2169 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
2170 if (lseg->pls_range.iomode == IOMODE_RW &&
2171 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
2172 list_add(&lseg->pls_lc_list, listp);
2173 }
2174 }
2175
2176 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp)
2177 {
2178 struct pnfs_layout_segment *lseg, *tmp;
2179
2180 /* Matched by references in pnfs_set_layoutcommit */
2181 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) {
2182 list_del_init(&lseg->pls_lc_list);
2183 pnfs_put_lseg(lseg);
2184 }
2185
2186 pnfs_clear_layoutcommitting(inode);
2187 }
2188
2189 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
2190 {
2191 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
2192 }
2193 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
2194
2195 void
2196 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg,
2197 loff_t end_pos)
2198 {
2199 struct nfs_inode *nfsi = NFS_I(inode);
2200 bool mark_as_dirty = false;
2201
2202 spin_lock(&inode->i_lock);
2203 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
2204 nfsi->layout->plh_lwb = end_pos;
2205 mark_as_dirty = true;
2206 dprintk("%s: Set layoutcommit for inode %lu ",
2207 __func__, inode->i_ino);
2208 } else if (end_pos > nfsi->layout->plh_lwb)
2209 nfsi->layout->plh_lwb = end_pos;
2210 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) {
2211 /* references matched in nfs4_layoutcommit_release */
2212 pnfs_get_lseg(lseg);
2213 }
2214 spin_unlock(&inode->i_lock);
2215 dprintk("%s: lseg %p end_pos %llu\n",
2216 __func__, lseg, nfsi->layout->plh_lwb);
2217
2218 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2219 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2220 if (mark_as_dirty)
2221 mark_inode_dirty_sync(inode);
2222 }
2223 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
2224
2225 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
2226 {
2227 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
2228
2229 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
2230 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
2231 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list);
2232 }
2233
2234 /*
2235 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2236 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2237 * data to disk to allow the server to recover the data if it crashes.
2238 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2239 * is off, and a COMMIT is sent to a data server, or
2240 * if WRITEs to a data server return NFS_DATA_SYNC.
2241 */
2242 int
2243 pnfs_layoutcommit_inode(struct inode *inode, bool sync)
2244 {
2245 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2246 struct nfs4_layoutcommit_data *data;
2247 struct nfs_inode *nfsi = NFS_I(inode);
2248 loff_t end_pos;
2249 int status;
2250
2251 if (!pnfs_layoutcommit_outstanding(inode))
2252 return 0;
2253
2254 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
2255
2256 status = -EAGAIN;
2257 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
2258 if (!sync)
2259 goto out;
2260 status = wait_on_bit_lock_action(&nfsi->flags,
2261 NFS_INO_LAYOUTCOMMITTING,
2262 nfs_wait_bit_killable,
2263 TASK_KILLABLE);
2264 if (status)
2265 goto out;
2266 }
2267
2268 status = -ENOMEM;
2269 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2270 data = kzalloc(sizeof(*data), GFP_NOFS);
2271 if (!data)
2272 goto clear_layoutcommitting;
2273
2274 status = 0;
2275 spin_lock(&inode->i_lock);
2276 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
2277 goto out_unlock;
2278
2279 INIT_LIST_HEAD(&data->lseg_list);
2280 pnfs_list_write_lseg(inode, &data->lseg_list);
2281
2282 end_pos = nfsi->layout->plh_lwb;
2283
2284 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
2285 spin_unlock(&inode->i_lock);
2286
2287 data->args.inode = inode;
2288 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
2289 nfs_fattr_init(&data->fattr);
2290 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
2291 data->res.fattr = &data->fattr;
2292 data->args.lastbytewritten = end_pos - 1;
2293 data->res.server = NFS_SERVER(inode);
2294
2295 if (ld->prepare_layoutcommit) {
2296 status = ld->prepare_layoutcommit(&data->args);
2297 if (status) {
2298 put_rpccred(data->cred);
2299 spin_lock(&inode->i_lock);
2300 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags);
2301 if (end_pos > nfsi->layout->plh_lwb)
2302 nfsi->layout->plh_lwb = end_pos;
2303 goto out_unlock;
2304 }
2305 }
2306
2307
2308 status = nfs4_proc_layoutcommit(data, sync);
2309 out:
2310 if (status)
2311 mark_inode_dirty_sync(inode);
2312 dprintk("<-- %s status %d\n", __func__, status);
2313 return status;
2314 out_unlock:
2315 spin_unlock(&inode->i_lock);
2316 kfree(data);
2317 clear_layoutcommitting:
2318 pnfs_clear_layoutcommitting(inode);
2319 goto out;
2320 }
2321 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode);
2322
2323 int
2324 pnfs_generic_sync(struct inode *inode, bool datasync)
2325 {
2326 return pnfs_layoutcommit_inode(inode, true);
2327 }
2328 EXPORT_SYMBOL_GPL(pnfs_generic_sync);
2329
2330 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
2331 {
2332 struct nfs4_threshold *thp;
2333
2334 thp = kzalloc(sizeof(*thp), GFP_NOFS);
2335 if (!thp) {
2336 dprintk("%s mdsthreshold allocation failed\n", __func__);
2337 return NULL;
2338 }
2339 return thp;
2340 }
2341
2342 #if IS_ENABLED(CONFIG_NFS_V4_2)
2343 int
2344 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
2345 {
2346 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
2347 struct nfs_server *server = NFS_SERVER(inode);
2348 struct nfs_inode *nfsi = NFS_I(inode);
2349 struct nfs42_layoutstat_data *data;
2350 struct pnfs_layout_hdr *hdr;
2351 int status = 0;
2352
2353 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
2354 goto out;
2355
2356 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS))
2357 goto out;
2358
2359 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags))
2360 goto out;
2361
2362 spin_lock(&inode->i_lock);
2363 if (!NFS_I(inode)->layout) {
2364 spin_unlock(&inode->i_lock);
2365 goto out;
2366 }
2367 hdr = NFS_I(inode)->layout;
2368 pnfs_get_layout_hdr(hdr);
2369 spin_unlock(&inode->i_lock);
2370
2371 data = kzalloc(sizeof(*data), gfp_flags);
2372 if (!data) {
2373 status = -ENOMEM;
2374 goto out_put;
2375 }
2376
2377 data->args.fh = NFS_FH(inode);
2378 data->args.inode = inode;
2379 nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
2380 status = ld->prepare_layoutstats(&data->args);
2381 if (status)
2382 goto out_free;
2383
2384 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
2385
2386 out:
2387 dprintk("%s returns %d\n", __func__, status);
2388 return status;
2389
2390 out_free:
2391 kfree(data);
2392 out_put:
2393 pnfs_put_layout_hdr(hdr);
2394 smp_mb__before_atomic();
2395 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags);
2396 smp_mb__after_atomic();
2397 goto out;
2398 }
2399 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);
2400 #endif
2401
2402 unsigned int layoutstats_timer;
2403 module_param(layoutstats_timer, uint, 0644);
2404 EXPORT_SYMBOL_GPL(layoutstats_timer);
Linux with added FPC-III support