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pnfs-block: removing DM device maybe cause oops when call dev_remove
[deliverable/linux.git] / fs / nfs / pnfs.c
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1/*
2 * pNFS functions to call and manage layout drivers.
3 *
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
6 * All Rights Reserved
7 *
8 * Dean Hildebrand <dhildebz@umich.edu>
9 *
10 * Permission is granted to use, copy, create derivative works, and
11 * redistribute this software and such derivative works for any purpose,
12 * so long as the name of the University of Michigan is not used in
13 * any advertising or publicity pertaining to the use or distribution
14 * of this software without specific, written prior authorization. If
15 * the above copyright notice or any other identification of the
16 * University of Michigan is included in any copy of any portion of
17 * this software, then the disclaimer below must also be included.
18 *
19 * This software is provided as is, without representation or warranty
20 * of any kind either express or implied, including without limitation
21 * the implied warranties of merchantability, fitness for a particular
22 * purpose, or noninfringement. The Regents of the University of
23 * Michigan shall not be liable for any damages, including special,
24 * indirect, incidental, or consequential damages, with respect to any
25 * claim arising out of or in connection with the use of the software,
26 * even if it has been or is hereafter advised of the possibility of
27 * such damages.
28 */
29
30#include <linux/nfs_fs.h>
31#include <linux/nfs_page.h>
32#include <linux/module.h>
33#include "internal.h"
34#include "pnfs.h"
35#include "iostat.h"
36
37#define NFSDBG_FACILITY NFSDBG_PNFS
38#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
39
40/* Locking:
41 *
42 * pnfs_spinlock:
43 * protects pnfs_modules_tbl.
44 */
45static DEFINE_SPINLOCK(pnfs_spinlock);
46
47/*
48 * pnfs_modules_tbl holds all pnfs modules
49 */
50static LIST_HEAD(pnfs_modules_tbl);
51
52/* Return the registered pnfs layout driver module matching given id */
53static struct pnfs_layoutdriver_type *
54find_pnfs_driver_locked(u32 id)
55{
56 struct pnfs_layoutdriver_type *local;
57
58 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid)
59 if (local->id == id)
60 goto out;
61 local = NULL;
62out:
63 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local);
64 return local;
65}
66
67static struct pnfs_layoutdriver_type *
68find_pnfs_driver(u32 id)
69{
70 struct pnfs_layoutdriver_type *local;
71
72 spin_lock(&pnfs_spinlock);
73 local = find_pnfs_driver_locked(id);
74 if (local != NULL && !try_module_get(local->owner)) {
75 dprintk("%s: Could not grab reference on module\n", __func__);
76 local = NULL;
77 }
78 spin_unlock(&pnfs_spinlock);
79 return local;
80}
81
82void
83unset_pnfs_layoutdriver(struct nfs_server *nfss)
84{
85 if (nfss->pnfs_curr_ld) {
86 if (nfss->pnfs_curr_ld->clear_layoutdriver)
87 nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
88 /* Decrement the MDS count. Purge the deviceid cache if zero */
89 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count))
90 nfs4_deviceid_purge_client(nfss->nfs_client);
91 module_put(nfss->pnfs_curr_ld->owner);
92 }
93 nfss->pnfs_curr_ld = NULL;
94}
95
96/*
97 * Try to set the server's pnfs module to the pnfs layout type specified by id.
98 * Currently only one pNFS layout driver per filesystem is supported.
99 *
100 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
101 */
102void
103set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh,
104 u32 id)
105{
106 struct pnfs_layoutdriver_type *ld_type = NULL;
107
108 if (id == 0)
109 goto out_no_driver;
110 if (!(server->nfs_client->cl_exchange_flags &
111 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) {
112 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n",
113 __func__, id, server->nfs_client->cl_exchange_flags);
114 goto out_no_driver;
115 }
116 ld_type = find_pnfs_driver(id);
117 if (!ld_type) {
118 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id);
119 ld_type = find_pnfs_driver(id);
120 if (!ld_type) {
121 dprintk("%s: No pNFS module found for %u.\n",
122 __func__, id);
123 goto out_no_driver;
124 }
125 }
126 server->pnfs_curr_ld = ld_type;
127 if (ld_type->set_layoutdriver
128 && ld_type->set_layoutdriver(server, mntfh)) {
129 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout "
130 "driver %u.\n", __func__, id);
131 module_put(ld_type->owner);
132 goto out_no_driver;
133 }
134 /* Bump the MDS count */
135 atomic_inc(&server->nfs_client->cl_mds_count);
136
137 dprintk("%s: pNFS module for %u set\n", __func__, id);
138 return;
139
140out_no_driver:
141 dprintk("%s: Using NFSv4 I/O\n", __func__);
142 server->pnfs_curr_ld = NULL;
143}
144
145int
146pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
147{
148 int status = -EINVAL;
149 struct pnfs_layoutdriver_type *tmp;
150
151 if (ld_type->id == 0) {
152 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__);
153 return status;
154 }
155 if (!ld_type->alloc_lseg || !ld_type->free_lseg) {
156 printk(KERN_ERR "NFS: %s Layout driver must provide "
157 "alloc_lseg and free_lseg.\n", __func__);
158 return status;
159 }
160
161 spin_lock(&pnfs_spinlock);
162 tmp = find_pnfs_driver_locked(ld_type->id);
163 if (!tmp) {
164 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl);
165 status = 0;
166 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id,
167 ld_type->name);
168 } else {
169 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n",
170 __func__, ld_type->id);
171 }
172 spin_unlock(&pnfs_spinlock);
173
174 return status;
175}
176EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver);
177
178void
179pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type)
180{
181 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id);
182 spin_lock(&pnfs_spinlock);
183 list_del(&ld_type->pnfs_tblid);
184 spin_unlock(&pnfs_spinlock);
185}
186EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver);
187
188/*
189 * pNFS client layout cache
190 */
191
192/* Need to hold i_lock if caller does not already hold reference */
193void
194pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo)
195{
196 atomic_inc(&lo->plh_refcount);
197}
198
199static struct pnfs_layout_hdr *
200pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags)
201{
202 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld;
203 return ld->alloc_layout_hdr(ino, gfp_flags);
204}
205
206static void
207pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
208{
209 struct nfs_server *server = NFS_SERVER(lo->plh_inode);
210 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
211
212 if (!list_empty(&lo->plh_layouts)) {
213 struct nfs_client *clp = server->nfs_client;
214
215 spin_lock(&clp->cl_lock);
216 list_del_init(&lo->plh_layouts);
217 spin_unlock(&clp->cl_lock);
218 }
219 put_rpccred(lo->plh_lc_cred);
220 return ld->free_layout_hdr(lo);
221}
222
223static void
224pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
225{
226 struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
227 dprintk("%s: freeing layout cache %p\n", __func__, lo);
228 nfsi->layout = NULL;
229 /* Reset MDS Threshold I/O counters */
230 nfsi->write_io = 0;
231 nfsi->read_io = 0;
232}
233
234void
235pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
236{
237 struct inode *inode = lo->plh_inode;
238
239 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
240 pnfs_detach_layout_hdr(lo);
241 spin_unlock(&inode->i_lock);
242 pnfs_free_layout_hdr(lo);
243 }
244}
245
246static int
247pnfs_iomode_to_fail_bit(u32 iomode)
248{
249 return iomode == IOMODE_RW ?
250 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
251}
252
253static void
254pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
255{
256 lo->plh_retry_timestamp = jiffies;
257 if (!test_and_set_bit(fail_bit, &lo->plh_flags))
258 atomic_inc(&lo->plh_refcount);
259}
260
261static void
262pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
263{
264 if (test_and_clear_bit(fail_bit, &lo->plh_flags))
265 atomic_dec(&lo->plh_refcount);
266}
267
268static void
269pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
270{
271 struct inode *inode = lo->plh_inode;
272 struct pnfs_layout_range range = {
273 .iomode = iomode,
274 .offset = 0,
275 .length = NFS4_MAX_UINT64,
276 };
277 LIST_HEAD(head);
278
279 spin_lock(&inode->i_lock);
280 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
281 pnfs_mark_matching_lsegs_invalid(lo, &head, &range);
282 spin_unlock(&inode->i_lock);
283 pnfs_free_lseg_list(&head);
284 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
285 iomode == IOMODE_RW ? "RW" : "READ");
286}
287
288static bool
289pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
290{
291 unsigned long start, end;
292 int fail_bit = pnfs_iomode_to_fail_bit(iomode);
293
294 if (test_bit(fail_bit, &lo->plh_flags) == 0)
295 return false;
296 end = jiffies;
297 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
298 if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
299 /* It is time to retry the failed layoutgets */
300 pnfs_layout_clear_fail_bit(lo, fail_bit);
301 return false;
302 }
303 return true;
304}
305
306static void
307init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
308{
309 INIT_LIST_HEAD(&lseg->pls_list);
310 INIT_LIST_HEAD(&lseg->pls_lc_list);
311 atomic_set(&lseg->pls_refcount, 1);
312 smp_mb();
313 set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
314 lseg->pls_layout = lo;
315}
316
317static void pnfs_free_lseg(struct pnfs_layout_segment *lseg)
318{
319 struct inode *ino = lseg->pls_layout->plh_inode;
320
321 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
322}
323
324static void
325pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo,
326 struct pnfs_layout_segment *lseg)
327{
328 struct inode *inode = lo->plh_inode;
329
330 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
331 list_del_init(&lseg->pls_list);
332 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
333 atomic_dec(&lo->plh_refcount);
334 if (list_empty(&lo->plh_segs))
335 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
336 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq);
337}
338
339void
340pnfs_put_lseg(struct pnfs_layout_segment *lseg)
341{
342 struct pnfs_layout_hdr *lo;
343 struct inode *inode;
344
345 if (!lseg)
346 return;
347
348 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
349 atomic_read(&lseg->pls_refcount),
350 test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
351 lo = lseg->pls_layout;
352 inode = lo->plh_inode;
353 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) {
354 pnfs_get_layout_hdr(lo);
355 pnfs_layout_remove_lseg(lo, lseg);
356 spin_unlock(&inode->i_lock);
357 pnfs_free_lseg(lseg);
358 pnfs_put_layout_hdr(lo);
359 }
360}
361EXPORT_SYMBOL_GPL(pnfs_put_lseg);
362
363static inline u64
364end_offset(u64 start, u64 len)
365{
366 u64 end;
367
368 end = start + len;
369 return end >= start ? end : NFS4_MAX_UINT64;
370}
371
372/*
373 * is l2 fully contained in l1?
374 * start1 end1
375 * [----------------------------------)
376 * start2 end2
377 * [----------------)
378 */
379static inline int
380lo_seg_contained(struct pnfs_layout_range *l1,
381 struct pnfs_layout_range *l2)
382{
383 u64 start1 = l1->offset;
384 u64 end1 = end_offset(start1, l1->length);
385 u64 start2 = l2->offset;
386 u64 end2 = end_offset(start2, l2->length);
387
388 return (start1 <= start2) && (end1 >= end2);
389}
390
391/*
392 * is l1 and l2 intersecting?
393 * start1 end1
394 * [----------------------------------)
395 * start2 end2
396 * [----------------)
397 */
398static inline int
399lo_seg_intersecting(struct pnfs_layout_range *l1,
400 struct pnfs_layout_range *l2)
401{
402 u64 start1 = l1->offset;
403 u64 end1 = end_offset(start1, l1->length);
404 u64 start2 = l2->offset;
405 u64 end2 = end_offset(start2, l2->length);
406
407 return (end1 == NFS4_MAX_UINT64 || end1 > start2) &&
408 (end2 == NFS4_MAX_UINT64 || end2 > start1);
409}
410
411static bool
412should_free_lseg(struct pnfs_layout_range *lseg_range,
413 struct pnfs_layout_range *recall_range)
414{
415 return (recall_range->iomode == IOMODE_ANY ||
416 lseg_range->iomode == recall_range->iomode) &&
417 lo_seg_intersecting(lseg_range, recall_range);
418}
419
420/* Returns 1 if lseg is removed from list, 0 otherwise */
421static int mark_lseg_invalid(struct pnfs_layout_segment *lseg,
422 struct list_head *tmp_list)
423{
424 int rv = 0;
425
426 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) {
427 /* Remove the reference keeping the lseg in the
428 * list. It will now be removed when all
429 * outstanding io is finished.
430 */
431 dprintk("%s: lseg %p ref %d\n", __func__, lseg,
432 atomic_read(&lseg->pls_refcount));
433 if (atomic_dec_and_test(&lseg->pls_refcount)) {
434 pnfs_layout_remove_lseg(lseg->pls_layout, lseg);
435 list_add(&lseg->pls_list, tmp_list);
436 rv = 1;
437 }
438 }
439 return rv;
440}
441
442/* Returns count of number of matching invalid lsegs remaining in list
443 * after call.
444 */
445int
446pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
447 struct list_head *tmp_list,
448 struct pnfs_layout_range *recall_range)
449{
450 struct pnfs_layout_segment *lseg, *next;
451 int invalid = 0, removed = 0;
452
453 dprintk("%s:Begin lo %p\n", __func__, lo);
454
455 if (list_empty(&lo->plh_segs))
456 return 0;
457 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list)
458 if (!recall_range ||
459 should_free_lseg(&lseg->pls_range, recall_range)) {
460 dprintk("%s: freeing lseg %p iomode %d "
461 "offset %llu length %llu\n", __func__,
462 lseg, lseg->pls_range.iomode, lseg->pls_range.offset,
463 lseg->pls_range.length);
464 invalid++;
465 removed += mark_lseg_invalid(lseg, tmp_list);
466 }
467 dprintk("%s:Return %i\n", __func__, invalid - removed);
468 return invalid - removed;
469}
470
471/* note free_me must contain lsegs from a single layout_hdr */
472void
473pnfs_free_lseg_list(struct list_head *free_me)
474{
475 struct pnfs_layout_segment *lseg, *tmp;
476
477 if (list_empty(free_me))
478 return;
479
480 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) {
481 list_del(&lseg->pls_list);
482 pnfs_free_lseg(lseg);
483 }
484}
485
486void
487pnfs_destroy_layout(struct nfs_inode *nfsi)
488{
489 struct pnfs_layout_hdr *lo;
490 LIST_HEAD(tmp_list);
491
492 spin_lock(&nfsi->vfs_inode.i_lock);
493 lo = nfsi->layout;
494 if (lo) {
495 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
496 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
497 pnfs_get_layout_hdr(lo);
498 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
499 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
500 spin_unlock(&nfsi->vfs_inode.i_lock);
501 pnfs_free_lseg_list(&tmp_list);
502 pnfs_put_layout_hdr(lo);
503 } else
504 spin_unlock(&nfsi->vfs_inode.i_lock);
505}
506EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
507
508static bool
509pnfs_layout_add_bulk_destroy_list(struct inode *inode,
510 struct list_head *layout_list)
511{
512 struct pnfs_layout_hdr *lo;
513 bool ret = false;
514
515 spin_lock(&inode->i_lock);
516 lo = NFS_I(inode)->layout;
517 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) {
518 pnfs_get_layout_hdr(lo);
519 list_add(&lo->plh_bulk_destroy, layout_list);
520 ret = true;
521 }
522 spin_unlock(&inode->i_lock);
523 return ret;
524}
525
526/* Caller must hold rcu_read_lock and clp->cl_lock */
527static int
528pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp,
529 struct nfs_server *server,
530 struct list_head *layout_list)
531{
532 struct pnfs_layout_hdr *lo, *next;
533 struct inode *inode;
534
535 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) {
536 inode = igrab(lo->plh_inode);
537 if (inode == NULL)
538 continue;
539 list_del_init(&lo->plh_layouts);
540 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list))
541 continue;
542 rcu_read_unlock();
543 spin_unlock(&clp->cl_lock);
544 iput(inode);
545 spin_lock(&clp->cl_lock);
546 rcu_read_lock();
547 return -EAGAIN;
548 }
549 return 0;
550}
551
552static int
553pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list,
554 bool is_bulk_recall)
555{
556 struct pnfs_layout_hdr *lo;
557 struct inode *inode;
558 struct pnfs_layout_range range = {
559 .iomode = IOMODE_ANY,
560 .offset = 0,
561 .length = NFS4_MAX_UINT64,
562 };
563 LIST_HEAD(lseg_list);
564 int ret = 0;
565
566 while (!list_empty(layout_list)) {
567 lo = list_entry(layout_list->next, struct pnfs_layout_hdr,
568 plh_bulk_destroy);
569 dprintk("%s freeing layout for inode %lu\n", __func__,
570 lo->plh_inode->i_ino);
571 inode = lo->plh_inode;
572 spin_lock(&inode->i_lock);
573 list_del_init(&lo->plh_bulk_destroy);
574 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
575 if (is_bulk_recall)
576 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
577 if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range))
578 ret = -EAGAIN;
579 spin_unlock(&inode->i_lock);
580 pnfs_free_lseg_list(&lseg_list);
581 pnfs_put_layout_hdr(lo);
582 iput(inode);
583 }
584 return ret;
585}
586
587int
588pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
589 struct nfs_fsid *fsid,
590 bool is_recall)
591{
592 struct nfs_server *server;
593 LIST_HEAD(layout_list);
594
595 spin_lock(&clp->cl_lock);
596 rcu_read_lock();
597restart:
598 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
599 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0)
600 continue;
601 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
602 server,
603 &layout_list) != 0)
604 goto restart;
605 }
606 rcu_read_unlock();
607 spin_unlock(&clp->cl_lock);
608
609 if (list_empty(&layout_list))
610 return 0;
611 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
612}
613
614int
615pnfs_destroy_layouts_byclid(struct nfs_client *clp,
616 bool is_recall)
617{
618 struct nfs_server *server;
619 LIST_HEAD(layout_list);
620
621 spin_lock(&clp->cl_lock);
622 rcu_read_lock();
623restart:
624 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
625 if (pnfs_layout_bulk_destroy_byserver_locked(clp,
626 server,
627 &layout_list) != 0)
628 goto restart;
629 }
630 rcu_read_unlock();
631 spin_unlock(&clp->cl_lock);
632
633 if (list_empty(&layout_list))
634 return 0;
635 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall);
636}
637
638/*
639 * Called by the state manger to remove all layouts established under an
640 * expired lease.
641 */
642void
643pnfs_destroy_all_layouts(struct nfs_client *clp)
644{
645 nfs4_deviceid_mark_client_invalid(clp);
646 nfs4_deviceid_purge_client(clp);
647
648 pnfs_destroy_layouts_byclid(clp, false);
649}
650
651/*
652 * Compare 2 layout stateid sequence ids, to see which is newer,
653 * taking into account wraparound issues.
654 */
655static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
656{
657 return (s32)s1 - (s32)s2 > 0;
658}
659
660/* update lo->plh_stateid with new if is more recent */
661void
662pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new,
663 bool update_barrier)
664{
665 u32 oldseq, newseq, new_barrier;
666 int empty = list_empty(&lo->plh_segs);
667
668 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
669 newseq = be32_to_cpu(new->seqid);
670 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) {
671 nfs4_stateid_copy(&lo->plh_stateid, new);
672 if (update_barrier) {
673 new_barrier = be32_to_cpu(new->seqid);
674 } else {
675 /* Because of wraparound, we want to keep the barrier
676 * "close" to the current seqids.
677 */
678 new_barrier = newseq - atomic_read(&lo->plh_outstanding);
679 }
680 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier))
681 lo->plh_barrier = new_barrier;
682 }
683}
684
685static bool
686pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
687 const nfs4_stateid *stateid)
688{
689 u32 seqid = be32_to_cpu(stateid->seqid);
690
691 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier);
692}
693
694/* lget is set to 1 if called from inside send_layoutget call chain */
695static bool
696pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo, int lget)
697{
698 return lo->plh_block_lgets ||
699 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
700 (list_empty(&lo->plh_segs) &&
701 (atomic_read(&lo->plh_outstanding) > lget));
702}
703
704int
705pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo,
706 struct nfs4_state *open_state)
707{
708 int status = 0;
709
710 dprintk("--> %s\n", __func__);
711 spin_lock(&lo->plh_inode->i_lock);
712 if (pnfs_layoutgets_blocked(lo, 1)) {
713 status = -EAGAIN;
714 } else if (list_empty(&lo->plh_segs)) {
715 int seq;
716
717 do {
718 seq = read_seqbegin(&open_state->seqlock);
719 nfs4_stateid_copy(dst, &open_state->stateid);
720 } while (read_seqretry(&open_state->seqlock, seq));
721 } else
722 nfs4_stateid_copy(dst, &lo->plh_stateid);
723 spin_unlock(&lo->plh_inode->i_lock);
724 dprintk("<-- %s\n", __func__);
725 return status;
726}
727
728/*
729* Get layout from server.
730* for now, assume that whole file layouts are requested.
731* arg->offset: 0
732* arg->length: all ones
733*/
734static struct pnfs_layout_segment *
735send_layoutget(struct pnfs_layout_hdr *lo,
736 struct nfs_open_context *ctx,
737 struct pnfs_layout_range *range,
738 gfp_t gfp_flags)
739{
740 struct inode *ino = lo->plh_inode;
741 struct nfs_server *server = NFS_SERVER(ino);
742 struct nfs4_layoutget *lgp;
743 struct pnfs_layout_segment *lseg;
744
745 dprintk("--> %s\n", __func__);
746
747 lgp = kzalloc(sizeof(*lgp), gfp_flags);
748 if (lgp == NULL)
749 return NULL;
750
751 lgp->args.minlength = PAGE_CACHE_SIZE;
752 if (lgp->args.minlength > range->length)
753 lgp->args.minlength = range->length;
754 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE;
755 lgp->args.range = *range;
756 lgp->args.type = server->pnfs_curr_ld->id;
757 lgp->args.inode = ino;
758 lgp->args.ctx = get_nfs_open_context(ctx);
759 lgp->gfp_flags = gfp_flags;
760
761 /* Synchronously retrieve layout information from server and
762 * store in lseg.
763 */
764 lseg = nfs4_proc_layoutget(lgp, gfp_flags);
765 if (IS_ERR(lseg)) {
766 switch (PTR_ERR(lseg)) {
767 case -ENOMEM:
768 case -ERESTARTSYS:
769 break;
770 default:
771 /* remember that LAYOUTGET failed and suspend trying */
772 pnfs_layout_io_set_failed(lo, range->iomode);
773 }
774 return NULL;
775 }
776
777 return lseg;
778}
779
780/*
781 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
782 * when the layout segment list is empty.
783 *
784 * Note that a pnfs_layout_hdr can exist with an empty layout segment
785 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
786 * deviceid is marked invalid.
787 */
788int
789_pnfs_return_layout(struct inode *ino)
790{
791 struct pnfs_layout_hdr *lo = NULL;
792 struct nfs_inode *nfsi = NFS_I(ino);
793 LIST_HEAD(tmp_list);
794 struct nfs4_layoutreturn *lrp;
795 nfs4_stateid stateid;
796 int status = 0, empty;
797
798 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino);
799
800 spin_lock(&ino->i_lock);
801 lo = nfsi->layout;
802 if (!lo) {
803 spin_unlock(&ino->i_lock);
804 dprintk("NFS: %s no layout to return\n", __func__);
805 goto out;
806 }
807 stateid = nfsi->layout->plh_stateid;
808 /* Reference matched in nfs4_layoutreturn_release */
809 pnfs_get_layout_hdr(lo);
810 empty = list_empty(&lo->plh_segs);
811 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
812 /* Don't send a LAYOUTRETURN if list was initially empty */
813 if (empty) {
814 spin_unlock(&ino->i_lock);
815 pnfs_put_layout_hdr(lo);
816 dprintk("NFS: %s no layout segments to return\n", __func__);
817 goto out;
818 }
819 lo->plh_block_lgets++;
820 spin_unlock(&ino->i_lock);
821 pnfs_free_lseg_list(&tmp_list);
822
823 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags));
824
825 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL);
826 if (unlikely(lrp == NULL)) {
827 status = -ENOMEM;
828 spin_lock(&ino->i_lock);
829 lo->plh_block_lgets--;
830 spin_unlock(&ino->i_lock);
831 pnfs_put_layout_hdr(lo);
832 goto out;
833 }
834
835 lrp->args.stateid = stateid;
836 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id;
837 lrp->args.inode = ino;
838 lrp->args.layout = lo;
839 lrp->clp = NFS_SERVER(ino)->nfs_client;
840
841 status = nfs4_proc_layoutreturn(lrp);
842out:
843 dprintk("<-- %s status: %d\n", __func__, status);
844 return status;
845}
846EXPORT_SYMBOL_GPL(_pnfs_return_layout);
847
848bool pnfs_roc(struct inode *ino)
849{
850 struct pnfs_layout_hdr *lo;
851 struct pnfs_layout_segment *lseg, *tmp;
852 LIST_HEAD(tmp_list);
853 bool found = false;
854
855 spin_lock(&ino->i_lock);
856 lo = NFS_I(ino)->layout;
857 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) ||
858 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags))
859 goto out_nolayout;
860 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list)
861 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
862 mark_lseg_invalid(lseg, &tmp_list);
863 found = true;
864 }
865 if (!found)
866 goto out_nolayout;
867 lo->plh_block_lgets++;
868 pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */
869 spin_unlock(&ino->i_lock);
870 pnfs_free_lseg_list(&tmp_list);
871 return true;
872
873out_nolayout:
874 spin_unlock(&ino->i_lock);
875 return false;
876}
877
878void pnfs_roc_release(struct inode *ino)
879{
880 struct pnfs_layout_hdr *lo;
881
882 spin_lock(&ino->i_lock);
883 lo = NFS_I(ino)->layout;
884 lo->plh_block_lgets--;
885 if (atomic_dec_and_test(&lo->plh_refcount)) {
886 pnfs_detach_layout_hdr(lo);
887 spin_unlock(&ino->i_lock);
888 pnfs_free_layout_hdr(lo);
889 } else
890 spin_unlock(&ino->i_lock);
891}
892
893void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
894{
895 struct pnfs_layout_hdr *lo;
896
897 spin_lock(&ino->i_lock);
898 lo = NFS_I(ino)->layout;
899 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier))
900 lo->plh_barrier = barrier;
901 spin_unlock(&ino->i_lock);
902}
903
904bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
905{
906 struct nfs_inode *nfsi = NFS_I(ino);
907 struct pnfs_layout_hdr *lo;
908 struct pnfs_layout_segment *lseg;
909 u32 current_seqid;
910 bool found = false;
911
912 spin_lock(&ino->i_lock);
913 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list)
914 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) {
915 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL);
916 found = true;
917 goto out;
918 }
919 lo = nfsi->layout;
920 current_seqid = be32_to_cpu(lo->plh_stateid.seqid);
921
922 /* Since close does not return a layout stateid for use as
923 * a barrier, we choose the worst-case barrier.
924 */
925 *barrier = current_seqid + atomic_read(&lo->plh_outstanding);
926out:
927 spin_unlock(&ino->i_lock);
928 return found;
929}
930
931/*
932 * Compare two layout segments for sorting into layout cache.
933 * We want to preferentially return RW over RO layouts, so ensure those
934 * are seen first.
935 */
936static s64
937cmp_layout(struct pnfs_layout_range *l1,
938 struct pnfs_layout_range *l2)
939{
940 s64 d;
941
942 /* high offset > low offset */
943 d = l1->offset - l2->offset;
944 if (d)
945 return d;
946
947 /* short length > long length */
948 d = l2->length - l1->length;
949 if (d)
950 return d;
951
952 /* read > read/write */
953 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
954}
955
956static void
957pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
958 struct pnfs_layout_segment *lseg)
959{
960 struct pnfs_layout_segment *lp;
961
962 dprintk("%s:Begin\n", __func__);
963
964 list_for_each_entry(lp, &lo->plh_segs, pls_list) {
965 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0)
966 continue;
967 list_add_tail(&lseg->pls_list, &lp->pls_list);
968 dprintk("%s: inserted lseg %p "
969 "iomode %d offset %llu length %llu before "
970 "lp %p iomode %d offset %llu length %llu\n",
971 __func__, lseg, lseg->pls_range.iomode,
972 lseg->pls_range.offset, lseg->pls_range.length,
973 lp, lp->pls_range.iomode, lp->pls_range.offset,
974 lp->pls_range.length);
975 goto out;
976 }
977 list_add_tail(&lseg->pls_list, &lo->plh_segs);
978 dprintk("%s: inserted lseg %p "
979 "iomode %d offset %llu length %llu at tail\n",
980 __func__, lseg, lseg->pls_range.iomode,
981 lseg->pls_range.offset, lseg->pls_range.length);
982out:
983 pnfs_get_layout_hdr(lo);
984
985 dprintk("%s:Return\n", __func__);
986}
987
988static struct pnfs_layout_hdr *
989alloc_init_layout_hdr(struct inode *ino,
990 struct nfs_open_context *ctx,
991 gfp_t gfp_flags)
992{
993 struct pnfs_layout_hdr *lo;
994
995 lo = pnfs_alloc_layout_hdr(ino, gfp_flags);
996 if (!lo)
997 return NULL;
998 atomic_set(&lo->plh_refcount, 1);
999 INIT_LIST_HEAD(&lo->plh_layouts);
1000 INIT_LIST_HEAD(&lo->plh_segs);
1001 INIT_LIST_HEAD(&lo->plh_bulk_destroy);
1002 lo->plh_inode = ino;
1003 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred);
1004 return lo;
1005}
1006
1007static struct pnfs_layout_hdr *
1008pnfs_find_alloc_layout(struct inode *ino,
1009 struct nfs_open_context *ctx,
1010 gfp_t gfp_flags)
1011{
1012 struct nfs_inode *nfsi = NFS_I(ino);
1013 struct pnfs_layout_hdr *new = NULL;
1014
1015 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout);
1016
1017 if (nfsi->layout != NULL)
1018 goto out_existing;
1019 spin_unlock(&ino->i_lock);
1020 new = alloc_init_layout_hdr(ino, ctx, gfp_flags);
1021 spin_lock(&ino->i_lock);
1022
1023 if (likely(nfsi->layout == NULL)) { /* Won the race? */
1024 nfsi->layout = new;
1025 return new;
1026 } else if (new != NULL)
1027 pnfs_free_layout_hdr(new);
1028out_existing:
1029 pnfs_get_layout_hdr(nfsi->layout);
1030 return nfsi->layout;
1031}
1032
1033/*
1034 * iomode matching rules:
1035 * iomode lseg match
1036 * ----- ----- -----
1037 * ANY READ true
1038 * ANY RW true
1039 * RW READ false
1040 * RW RW true
1041 * READ READ true
1042 * READ RW true
1043 */
1044static int
1045is_matching_lseg(struct pnfs_layout_range *ls_range,
1046 struct pnfs_layout_range *range)
1047{
1048 struct pnfs_layout_range range1;
1049
1050 if ((range->iomode == IOMODE_RW &&
1051 ls_range->iomode != IOMODE_RW) ||
1052 !lo_seg_intersecting(ls_range, range))
1053 return 0;
1054
1055 /* range1 covers only the first byte in the range */
1056 range1 = *range;
1057 range1.length = 1;
1058 return lo_seg_contained(ls_range, &range1);
1059}
1060
1061/*
1062 * lookup range in layout
1063 */
1064static struct pnfs_layout_segment *
1065pnfs_find_lseg(struct pnfs_layout_hdr *lo,
1066 struct pnfs_layout_range *range)
1067{
1068 struct pnfs_layout_segment *lseg, *ret = NULL;
1069
1070 dprintk("%s:Begin\n", __func__);
1071
1072 list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
1073 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) &&
1074 is_matching_lseg(&lseg->pls_range, range)) {
1075 ret = pnfs_get_lseg(lseg);
1076 break;
1077 }
1078 if (lseg->pls_range.offset > range->offset)
1079 break;
1080 }
1081
1082 dprintk("%s:Return lseg %p ref %d\n",
1083 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0);
1084 return ret;
1085}
1086
1087/*
1088 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1089 * to the MDS or over pNFS
1090 *
1091 * The nfs_inode read_io and write_io fields are cumulative counters reset
1092 * when there are no layout segments. Note that in pnfs_update_layout iomode
1093 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1094 * WRITE request.
1095 *
1096 * A return of true means use MDS I/O.
1097 *
1098 * From rfc 5661:
1099 * If a file's size is smaller than the file size threshold, data accesses
1100 * SHOULD be sent to the metadata server. If an I/O request has a length that
1101 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1102 * server. If both file size and I/O size are provided, the client SHOULD
1103 * reach or exceed both thresholds before sending its read or write
1104 * requests to the data server.
1105 */
1106static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx,
1107 struct inode *ino, int iomode)
1108{
1109 struct nfs4_threshold *t = ctx->mdsthreshold;
1110 struct nfs_inode *nfsi = NFS_I(ino);
1111 loff_t fsize = i_size_read(ino);
1112 bool size = false, size_set = false, io = false, io_set = false, ret = false;
1113
1114 if (t == NULL)
1115 return ret;
1116
1117 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1118 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz);
1119
1120 switch (iomode) {
1121 case IOMODE_READ:
1122 if (t->bm & THRESHOLD_RD) {
1123 dprintk("%s fsize %llu\n", __func__, fsize);
1124 size_set = true;
1125 if (fsize < t->rd_sz)
1126 size = true;
1127 }
1128 if (t->bm & THRESHOLD_RD_IO) {
1129 dprintk("%s nfsi->read_io %llu\n", __func__,
1130 nfsi->read_io);
1131 io_set = true;
1132 if (nfsi->read_io < t->rd_io_sz)
1133 io = true;
1134 }
1135 break;
1136 case IOMODE_RW:
1137 if (t->bm & THRESHOLD_WR) {
1138 dprintk("%s fsize %llu\n", __func__, fsize);
1139 size_set = true;
1140 if (fsize < t->wr_sz)
1141 size = true;
1142 }
1143 if (t->bm & THRESHOLD_WR_IO) {
1144 dprintk("%s nfsi->write_io %llu\n", __func__,
1145 nfsi->write_io);
1146 io_set = true;
1147 if (nfsi->write_io < t->wr_io_sz)
1148 io = true;
1149 }
1150 break;
1151 }
1152 if (size_set && io_set) {
1153 if (size && io)
1154 ret = true;
1155 } else if (size || io)
1156 ret = true;
1157
1158 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret);
1159 return ret;
1160}
1161
1162/*
1163 * Layout segment is retreived from the server if not cached.
1164 * The appropriate layout segment is referenced and returned to the caller.
1165 */
1166struct pnfs_layout_segment *
1167pnfs_update_layout(struct inode *ino,
1168 struct nfs_open_context *ctx,
1169 loff_t pos,
1170 u64 count,
1171 enum pnfs_iomode iomode,
1172 gfp_t gfp_flags)
1173{
1174 struct pnfs_layout_range arg = {
1175 .iomode = iomode,
1176 .offset = pos,
1177 .length = count,
1178 };
1179 unsigned pg_offset;
1180 struct nfs_server *server = NFS_SERVER(ino);
1181 struct nfs_client *clp = server->nfs_client;
1182 struct pnfs_layout_hdr *lo;
1183 struct pnfs_layout_segment *lseg = NULL;
1184 bool first;
1185
1186 if (!pnfs_enabled_sb(NFS_SERVER(ino)))
1187 goto out;
1188
1189 if (pnfs_within_mdsthreshold(ctx, ino, iomode))
1190 goto out;
1191
1192 spin_lock(&ino->i_lock);
1193 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
1194 if (lo == NULL) {
1195 spin_unlock(&ino->i_lock);
1196 goto out;
1197 }
1198
1199 /* Do we even need to bother with this? */
1200 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1201 dprintk("%s matches recall, use MDS\n", __func__);
1202 goto out_unlock;
1203 }
1204
1205 /* if LAYOUTGET already failed once we don't try again */
1206 if (pnfs_layout_io_test_failed(lo, iomode))
1207 goto out_unlock;
1208
1209 /* Check to see if the layout for the given range already exists */
1210 lseg = pnfs_find_lseg(lo, &arg);
1211 if (lseg)
1212 goto out_unlock;
1213
1214 if (pnfs_layoutgets_blocked(lo, 0))
1215 goto out_unlock;
1216 atomic_inc(&lo->plh_outstanding);
1217
1218 first = list_empty(&lo->plh_layouts) ? true : false;
1219 spin_unlock(&ino->i_lock);
1220
1221 if (first) {
1222 /* The lo must be on the clp list if there is any
1223 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1224 */
1225 spin_lock(&clp->cl_lock);
1226 list_add_tail(&lo->plh_layouts, &server->layouts);
1227 spin_unlock(&clp->cl_lock);
1228 }
1229
1230 pg_offset = arg.offset & ~PAGE_CACHE_MASK;
1231 if (pg_offset) {
1232 arg.offset -= pg_offset;
1233 arg.length += pg_offset;
1234 }
1235 if (arg.length != NFS4_MAX_UINT64)
1236 arg.length = PAGE_CACHE_ALIGN(arg.length);
1237
1238 lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
1239 atomic_dec(&lo->plh_outstanding);
1240out_put_layout_hdr:
1241 pnfs_put_layout_hdr(lo);
1242out:
1243 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1244 "(%s, offset: %llu, length: %llu)\n",
1245 __func__, ino->i_sb->s_id,
1246 (unsigned long long)NFS_FILEID(ino),
1247 lseg == NULL ? "not found" : "found",
1248 iomode==IOMODE_RW ? "read/write" : "read-only",
1249 (unsigned long long)pos,
1250 (unsigned long long)count);
1251 return lseg;
1252out_unlock:
1253 spin_unlock(&ino->i_lock);
1254 goto out_put_layout_hdr;
1255}
1256EXPORT_SYMBOL_GPL(pnfs_update_layout);
1257
1258struct pnfs_layout_segment *
1259pnfs_layout_process(struct nfs4_layoutget *lgp)
1260{
1261 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout;
1262 struct nfs4_layoutget_res *res = &lgp->res;
1263 struct pnfs_layout_segment *lseg;
1264 struct inode *ino = lo->plh_inode;
1265 int status = 0;
1266
1267 /* Inject layout blob into I/O device driver */
1268 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags);
1269 if (!lseg || IS_ERR(lseg)) {
1270 if (!lseg)
1271 status = -ENOMEM;
1272 else
1273 status = PTR_ERR(lseg);
1274 dprintk("%s: Could not allocate layout: error %d\n",
1275 __func__, status);
1276 goto out;
1277 }
1278
1279 spin_lock(&ino->i_lock);
1280 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
1281 dprintk("%s forget reply due to recall\n", __func__);
1282 goto out_forget_reply;
1283 }
1284
1285 if (pnfs_layoutgets_blocked(lo, 1) ||
1286 pnfs_layout_stateid_blocked(lo, &res->stateid)) {
1287 dprintk("%s forget reply due to state\n", __func__);
1288 goto out_forget_reply;
1289 }
1290
1291 /* Done processing layoutget. Set the layout stateid */
1292 pnfs_set_layout_stateid(lo, &res->stateid, false);
1293
1294 init_lseg(lo, lseg);
1295 lseg->pls_range = res->range;
1296 pnfs_get_lseg(lseg);
1297 pnfs_layout_insert_lseg(lo, lseg);
1298
1299 if (res->return_on_close) {
1300 set_bit(NFS_LSEG_ROC, &lseg->pls_flags);
1301 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags);
1302 }
1303
1304 spin_unlock(&ino->i_lock);
1305 return lseg;
1306out:
1307 return ERR_PTR(status);
1308
1309out_forget_reply:
1310 spin_unlock(&ino->i_lock);
1311 lseg->pls_layout = lo;
1312 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
1313 goto out;
1314}
1315
1316void
1317pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
1318{
1319 u64 rd_size = req->wb_bytes;
1320
1321 WARN_ON_ONCE(pgio->pg_lseg != NULL);
1322
1323 if (req->wb_offset != req->wb_pgbase) {
1324 nfs_pageio_reset_read_mds(pgio);
1325 return;
1326 }
1327
1328 if (pgio->pg_dreq == NULL)
1329 rd_size = i_size_read(pgio->pg_inode) - req_offset(req);
1330 else
1331 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq);
1332
1333 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1334 req->wb_context,
1335 req_offset(req),
1336 rd_size,
1337 IOMODE_READ,
1338 GFP_KERNEL);
1339 /* If no lseg, fall back to read through mds */
1340 if (pgio->pg_lseg == NULL)
1341 nfs_pageio_reset_read_mds(pgio);
1342
1343}
1344EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
1345
1346void
1347pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
1348 struct nfs_page *req, u64 wb_size)
1349{
1350 WARN_ON_ONCE(pgio->pg_lseg != NULL);
1351
1352 if (req->wb_offset != req->wb_pgbase) {
1353 nfs_pageio_reset_write_mds(pgio);
1354 return;
1355 }
1356
1357 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
1358 req->wb_context,
1359 req_offset(req),
1360 wb_size,
1361 IOMODE_RW,
1362 GFP_NOFS);
1363 /* If no lseg, fall back to write through mds */
1364 if (pgio->pg_lseg == NULL)
1365 nfs_pageio_reset_write_mds(pgio);
1366}
1367EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
1368
1369void
1370pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
1371 const struct nfs_pgio_completion_ops *compl_ops)
1372{
1373 struct nfs_server *server = NFS_SERVER(inode);
1374 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1375
1376 if (ld == NULL)
1377 nfs_pageio_init_read(pgio, inode, compl_ops);
1378 else
1379 nfs_pageio_init(pgio, inode, ld->pg_read_ops, compl_ops, server->rsize, 0);
1380}
1381
1382void
1383pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode,
1384 int ioflags,
1385 const struct nfs_pgio_completion_ops *compl_ops)
1386{
1387 struct nfs_server *server = NFS_SERVER(inode);
1388 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
1389
1390 if (ld == NULL)
1391 nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
1392 else
1393 nfs_pageio_init(pgio, inode, ld->pg_write_ops, compl_ops, server->wsize, ioflags);
1394}
1395
1396bool
1397pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
1398 struct nfs_page *req)
1399{
1400 if (pgio->pg_lseg == NULL)
1401 return nfs_generic_pg_test(pgio, prev, req);
1402
1403 /*
1404 * Test if a nfs_page is fully contained in the pnfs_layout_range.
1405 * Note that this test makes several assumptions:
1406 * - that the previous nfs_page in the struct nfs_pageio_descriptor
1407 * is known to lie within the range.
1408 * - that the nfs_page being tested is known to be contiguous with the
1409 * previous nfs_page.
1410 * - Layout ranges are page aligned, so we only have to test the
1411 * start offset of the request.
1412 *
1413 * Please also note that 'end_offset' is actually the offset of the
1414 * first byte that lies outside the pnfs_layout_range. FIXME?
1415 *
1416 */
1417 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset,
1418 pgio->pg_lseg->pls_range.length);
1419}
1420EXPORT_SYMBOL_GPL(pnfs_generic_pg_test);
1421
1422int pnfs_write_done_resend_to_mds(struct inode *inode,
1423 struct list_head *head,
1424 const struct nfs_pgio_completion_ops *compl_ops,
1425 struct nfs_direct_req *dreq)
1426{
1427 struct nfs_pageio_descriptor pgio;
1428 LIST_HEAD(failed);
1429
1430 /* Resend all requests through the MDS */
1431 nfs_pageio_init_write(&pgio, inode, FLUSH_STABLE, compl_ops);
1432 pgio.pg_dreq = dreq;
1433 while (!list_empty(head)) {
1434 struct nfs_page *req = nfs_list_entry(head->next);
1435
1436 nfs_list_remove_request(req);
1437 if (!nfs_pageio_add_request(&pgio, req))
1438 nfs_list_add_request(req, &failed);
1439 }
1440 nfs_pageio_complete(&pgio);
1441
1442 if (!list_empty(&failed)) {
1443 /* For some reason our attempt to resend pages. Mark the
1444 * overall send request as having failed, and let
1445 * nfs_writeback_release_full deal with the error.
1446 */
1447 list_move(&failed, head);
1448 return -EIO;
1449 }
1450 return 0;
1451}
1452EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds);
1453
1454static void pnfs_ld_handle_write_error(struct nfs_write_data *data)
1455{
1456 struct nfs_pgio_header *hdr = data->header;
1457
1458 dprintk("pnfs write error = %d\n", hdr->pnfs_error);
1459 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1460 PNFS_LAYOUTRET_ON_ERROR) {
1461 clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);
1462 pnfs_return_layout(hdr->inode);
1463 }
1464 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1465 data->task.tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
1466 &hdr->pages,
1467 hdr->completion_ops,
1468 hdr->dreq);
1469}
1470
1471/*
1472 * Called by non rpc-based layout drivers
1473 */
1474void pnfs_ld_write_done(struct nfs_write_data *data)
1475{
1476 struct nfs_pgio_header *hdr = data->header;
1477
1478 if (!hdr->pnfs_error) {
1479 pnfs_set_layoutcommit(data);
1480 hdr->mds_ops->rpc_call_done(&data->task, data);
1481 } else
1482 pnfs_ld_handle_write_error(data);
1483 hdr->mds_ops->rpc_release(data);
1484}
1485EXPORT_SYMBOL_GPL(pnfs_ld_write_done);
1486
1487static void
1488pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
1489 struct nfs_write_data *data)
1490{
1491 struct nfs_pgio_header *hdr = data->header;
1492
1493 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1494 list_splice_tail_init(&hdr->pages, &desc->pg_list);
1495 nfs_pageio_reset_write_mds(desc);
1496 desc->pg_recoalesce = 1;
1497 }
1498 nfs_writedata_release(data);
1499}
1500
1501static enum pnfs_try_status
1502pnfs_try_to_write_data(struct nfs_write_data *wdata,
1503 const struct rpc_call_ops *call_ops,
1504 struct pnfs_layout_segment *lseg,
1505 int how)
1506{
1507 struct nfs_pgio_header *hdr = wdata->header;
1508 struct inode *inode = hdr->inode;
1509 enum pnfs_try_status trypnfs;
1510 struct nfs_server *nfss = NFS_SERVER(inode);
1511
1512 hdr->mds_ops = call_ops;
1513
1514 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__,
1515 inode->i_ino, wdata->args.count, wdata->args.offset, how);
1516 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how);
1517 if (trypnfs != PNFS_NOT_ATTEMPTED)
1518 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE);
1519 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1520 return trypnfs;
1521}
1522
1523static void
1524pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how)
1525{
1526 struct nfs_write_data *data;
1527 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1528 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1529
1530 desc->pg_lseg = NULL;
1531 while (!list_empty(head)) {
1532 enum pnfs_try_status trypnfs;
1533
1534 data = list_first_entry(head, struct nfs_write_data, list);
1535 list_del_init(&data->list);
1536
1537 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how);
1538 if (trypnfs == PNFS_NOT_ATTEMPTED)
1539 pnfs_write_through_mds(desc, data);
1540 }
1541 pnfs_put_lseg(lseg);
1542}
1543
1544static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
1545{
1546 pnfs_put_lseg(hdr->lseg);
1547 nfs_writehdr_free(hdr);
1548}
1549EXPORT_SYMBOL_GPL(pnfs_writehdr_free);
1550
1551int
1552pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1553{
1554 struct nfs_write_header *whdr;
1555 struct nfs_pgio_header *hdr;
1556 int ret;
1557
1558 whdr = nfs_writehdr_alloc();
1559 if (!whdr) {
1560 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1561 pnfs_put_lseg(desc->pg_lseg);
1562 desc->pg_lseg = NULL;
1563 return -ENOMEM;
1564 }
1565 hdr = &whdr->header;
1566 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
1567 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1568 atomic_inc(&hdr->refcnt);
1569 ret = nfs_generic_flush(desc, hdr);
1570 if (ret != 0) {
1571 pnfs_put_lseg(desc->pg_lseg);
1572 desc->pg_lseg = NULL;
1573 } else
1574 pnfs_do_multiple_writes(desc, &hdr->rpc_list, desc->pg_ioflags);
1575 if (atomic_dec_and_test(&hdr->refcnt))
1576 hdr->completion_ops->completion(hdr);
1577 return ret;
1578}
1579EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
1580
1581int pnfs_read_done_resend_to_mds(struct inode *inode,
1582 struct list_head *head,
1583 const struct nfs_pgio_completion_ops *compl_ops,
1584 struct nfs_direct_req *dreq)
1585{
1586 struct nfs_pageio_descriptor pgio;
1587 LIST_HEAD(failed);
1588
1589 /* Resend all requests through the MDS */
1590 nfs_pageio_init_read(&pgio, inode, compl_ops);
1591 pgio.pg_dreq = dreq;
1592 while (!list_empty(head)) {
1593 struct nfs_page *req = nfs_list_entry(head->next);
1594
1595 nfs_list_remove_request(req);
1596 if (!nfs_pageio_add_request(&pgio, req))
1597 nfs_list_add_request(req, &failed);
1598 }
1599 nfs_pageio_complete(&pgio);
1600
1601 if (!list_empty(&failed)) {
1602 list_move(&failed, head);
1603 return -EIO;
1604 }
1605 return 0;
1606}
1607EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds);
1608
1609static void pnfs_ld_handle_read_error(struct nfs_read_data *data)
1610{
1611 struct nfs_pgio_header *hdr = data->header;
1612
1613 dprintk("pnfs read error = %d\n", hdr->pnfs_error);
1614 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags &
1615 PNFS_LAYOUTRET_ON_ERROR) {
1616 clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(hdr->inode)->flags);
1617 pnfs_return_layout(hdr->inode);
1618 }
1619 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags))
1620 data->task.tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
1621 &hdr->pages,
1622 hdr->completion_ops,
1623 hdr->dreq);
1624}
1625
1626/*
1627 * Called by non rpc-based layout drivers
1628 */
1629void pnfs_ld_read_done(struct nfs_read_data *data)
1630{
1631 struct nfs_pgio_header *hdr = data->header;
1632
1633 if (likely(!hdr->pnfs_error)) {
1634 __nfs4_read_done_cb(data);
1635 hdr->mds_ops->rpc_call_done(&data->task, data);
1636 } else
1637 pnfs_ld_handle_read_error(data);
1638 hdr->mds_ops->rpc_release(data);
1639}
1640EXPORT_SYMBOL_GPL(pnfs_ld_read_done);
1641
1642static void
1643pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
1644 struct nfs_read_data *data)
1645{
1646 struct nfs_pgio_header *hdr = data->header;
1647
1648 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
1649 list_splice_tail_init(&hdr->pages, &desc->pg_list);
1650 nfs_pageio_reset_read_mds(desc);
1651 desc->pg_recoalesce = 1;
1652 }
1653 nfs_readdata_release(data);
1654}
1655
1656/*
1657 * Call the appropriate parallel I/O subsystem read function.
1658 */
1659static enum pnfs_try_status
1660pnfs_try_to_read_data(struct nfs_read_data *rdata,
1661 const struct rpc_call_ops *call_ops,
1662 struct pnfs_layout_segment *lseg)
1663{
1664 struct nfs_pgio_header *hdr = rdata->header;
1665 struct inode *inode = hdr->inode;
1666 struct nfs_server *nfss = NFS_SERVER(inode);
1667 enum pnfs_try_status trypnfs;
1668
1669 hdr->mds_ops = call_ops;
1670
1671 dprintk("%s: Reading ino:%lu %u@%llu\n",
1672 __func__, inode->i_ino, rdata->args.count, rdata->args.offset);
1673
1674 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata);
1675 if (trypnfs != PNFS_NOT_ATTEMPTED)
1676 nfs_inc_stats(inode, NFSIOS_PNFS_READ);
1677 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
1678 return trypnfs;
1679}
1680
1681static void
1682pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head)
1683{
1684 struct nfs_read_data *data;
1685 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
1686 struct pnfs_layout_segment *lseg = desc->pg_lseg;
1687
1688 desc->pg_lseg = NULL;
1689 while (!list_empty(head)) {
1690 enum pnfs_try_status trypnfs;
1691
1692 data = list_first_entry(head, struct nfs_read_data, list);
1693 list_del_init(&data->list);
1694
1695 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg);
1696 if (trypnfs == PNFS_NOT_ATTEMPTED)
1697 pnfs_read_through_mds(desc, data);
1698 }
1699 pnfs_put_lseg(lseg);
1700}
1701
1702static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
1703{
1704 pnfs_put_lseg(hdr->lseg);
1705 nfs_readhdr_free(hdr);
1706}
1707EXPORT_SYMBOL_GPL(pnfs_readhdr_free);
1708
1709int
1710pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
1711{
1712 struct nfs_read_header *rhdr;
1713 struct nfs_pgio_header *hdr;
1714 int ret;
1715
1716 rhdr = nfs_readhdr_alloc();
1717 if (!rhdr) {
1718 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1719 ret = -ENOMEM;
1720 pnfs_put_lseg(desc->pg_lseg);
1721 desc->pg_lseg = NULL;
1722 return ret;
1723 }
1724 hdr = &rhdr->header;
1725 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
1726 hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
1727 atomic_inc(&hdr->refcnt);
1728 ret = nfs_generic_pagein(desc, hdr);
1729 if (ret != 0) {
1730 pnfs_put_lseg(desc->pg_lseg);
1731 desc->pg_lseg = NULL;
1732 } else
1733 pnfs_do_multiple_reads(desc, &hdr->rpc_list);
1734 if (atomic_dec_and_test(&hdr->refcnt))
1735 hdr->completion_ops->completion(hdr);
1736 return ret;
1737}
1738EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
1739
1740/*
1741 * There can be multiple RW segments.
1742 */
1743static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
1744{
1745 struct pnfs_layout_segment *lseg;
1746
1747 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
1748 if (lseg->pls_range.iomode == IOMODE_RW &&
1749 test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
1750 list_add(&lseg->pls_lc_list, listp);
1751 }
1752}
1753
1754void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg)
1755{
1756 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode);
1757}
1758EXPORT_SYMBOL_GPL(pnfs_set_lo_fail);
1759
1760void
1761pnfs_set_layoutcommit(struct nfs_write_data *wdata)
1762{
1763 struct nfs_pgio_header *hdr = wdata->header;
1764 struct inode *inode = hdr->inode;
1765 struct nfs_inode *nfsi = NFS_I(inode);
1766 loff_t end_pos = wdata->mds_offset + wdata->res.count;
1767 bool mark_as_dirty = false;
1768
1769 spin_lock(&inode->i_lock);
1770 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1771 mark_as_dirty = true;
1772 dprintk("%s: Set layoutcommit for inode %lu ",
1773 __func__, inode->i_ino);
1774 }
1775 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &hdr->lseg->pls_flags)) {
1776 /* references matched in nfs4_layoutcommit_release */
1777 pnfs_get_lseg(hdr->lseg);
1778 }
1779 if (end_pos > nfsi->layout->plh_lwb)
1780 nfsi->layout->plh_lwb = end_pos;
1781 spin_unlock(&inode->i_lock);
1782 dprintk("%s: lseg %p end_pos %llu\n",
1783 __func__, hdr->lseg, nfsi->layout->plh_lwb);
1784
1785 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
1786 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
1787 if (mark_as_dirty)
1788 mark_inode_dirty_sync(inode);
1789}
1790EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit);
1791
1792void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data)
1793{
1794 struct nfs_server *nfss = NFS_SERVER(data->args.inode);
1795
1796 if (nfss->pnfs_curr_ld->cleanup_layoutcommit)
1797 nfss->pnfs_curr_ld->cleanup_layoutcommit(data);
1798}
1799
1800/*
1801 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
1802 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
1803 * data to disk to allow the server to recover the data if it crashes.
1804 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
1805 * is off, and a COMMIT is sent to a data server, or
1806 * if WRITEs to a data server return NFS_DATA_SYNC.
1807 */
1808int
1809pnfs_layoutcommit_inode(struct inode *inode, bool sync)
1810{
1811 struct nfs4_layoutcommit_data *data;
1812 struct nfs_inode *nfsi = NFS_I(inode);
1813 loff_t end_pos;
1814 int status = 0;
1815
1816 dprintk("--> %s inode %lu\n", __func__, inode->i_ino);
1817
1818 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1819 return 0;
1820
1821 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
1822 data = kzalloc(sizeof(*data), GFP_NOFS);
1823 if (!data) {
1824 status = -ENOMEM;
1825 goto out;
1826 }
1827
1828 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags))
1829 goto out_free;
1830
1831 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) {
1832 if (!sync) {
1833 status = -EAGAIN;
1834 goto out_free;
1835 }
1836 status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING,
1837 nfs_wait_bit_killable, TASK_KILLABLE);
1838 if (status)
1839 goto out_free;
1840 }
1841
1842 INIT_LIST_HEAD(&data->lseg_list);
1843 spin_lock(&inode->i_lock);
1844 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
1845 clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags);
1846 spin_unlock(&inode->i_lock);
1847 wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING);
1848 goto out_free;
1849 }
1850
1851 pnfs_list_write_lseg(inode, &data->lseg_list);
1852
1853 end_pos = nfsi->layout->plh_lwb;
1854 nfsi->layout->plh_lwb = 0;
1855
1856 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid);
1857 spin_unlock(&inode->i_lock);
1858
1859 data->args.inode = inode;
1860 data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
1861 nfs_fattr_init(&data->fattr);
1862 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
1863 data->res.fattr = &data->fattr;
1864 data->args.lastbytewritten = end_pos - 1;
1865 data->res.server = NFS_SERVER(inode);
1866
1867 status = nfs4_proc_layoutcommit(data, sync);
1868out:
1869 if (status)
1870 mark_inode_dirty_sync(inode);
1871 dprintk("<-- %s status %d\n", __func__, status);
1872 return status;
1873out_free:
1874 kfree(data);
1875 goto out;
1876}
1877
1878struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
1879{
1880 struct nfs4_threshold *thp;
1881
1882 thp = kzalloc(sizeof(*thp), GFP_NOFS);
1883 if (!thp) {
1884 dprintk("%s mdsthreshold allocation failed\n", __func__);
1885 return NULL;
1886 }
1887 return thp;
1888}
Linux kernel - Deliverables
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