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