2 * pNFS functions to call and manage layout drivers.
4 * Copyright (c) 2002 [year of first publication]
5 * The Regents of the University of Michigan
8 * Dean Hildebrand <dhildebz@umich.edu>
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.
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
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_page.h>
32 #include <linux/module.h>
36 #include "nfs4trace.h"
37 #include "delegation.h"
40 #define NFSDBG_FACILITY NFSDBG_PNFS
41 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
46 * protects pnfs_modules_tbl.
48 static DEFINE_SPINLOCK(pnfs_spinlock
);
51 * pnfs_modules_tbl holds all pnfs modules
53 static LIST_HEAD(pnfs_modules_tbl
);
55 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr
*lo
);
57 /* Return the registered pnfs layout driver module matching given id */
58 static struct pnfs_layoutdriver_type
*
59 find_pnfs_driver_locked(u32 id
)
61 struct pnfs_layoutdriver_type
*local
;
63 list_for_each_entry(local
, &pnfs_modules_tbl
, pnfs_tblid
)
68 dprintk("%s: Searching for id %u, found %p\n", __func__
, id
, local
);
72 static struct pnfs_layoutdriver_type
*
73 find_pnfs_driver(u32 id
)
75 struct pnfs_layoutdriver_type
*local
;
77 spin_lock(&pnfs_spinlock
);
78 local
= find_pnfs_driver_locked(id
);
79 if (local
!= NULL
&& !try_module_get(local
->owner
)) {
80 dprintk("%s: Could not grab reference on module\n", __func__
);
83 spin_unlock(&pnfs_spinlock
);
88 unset_pnfs_layoutdriver(struct nfs_server
*nfss
)
90 if (nfss
->pnfs_curr_ld
) {
91 if (nfss
->pnfs_curr_ld
->clear_layoutdriver
)
92 nfss
->pnfs_curr_ld
->clear_layoutdriver(nfss
);
93 /* Decrement the MDS count. Purge the deviceid cache if zero */
94 if (atomic_dec_and_test(&nfss
->nfs_client
->cl_mds_count
))
95 nfs4_deviceid_purge_client(nfss
->nfs_client
);
96 module_put(nfss
->pnfs_curr_ld
->owner
);
98 nfss
->pnfs_curr_ld
= NULL
;
102 * Try to set the server's pnfs module to the pnfs layout type specified by id.
103 * Currently only one pNFS layout driver per filesystem is supported.
105 * @id layout type. Zero (illegal layout type) indicates pNFS not in use.
108 set_pnfs_layoutdriver(struct nfs_server
*server
, const struct nfs_fh
*mntfh
,
111 struct pnfs_layoutdriver_type
*ld_type
= NULL
;
115 if (!(server
->nfs_client
->cl_exchange_flags
&
116 (EXCHGID4_FLAG_USE_NON_PNFS
| EXCHGID4_FLAG_USE_PNFS_MDS
))) {
117 printk(KERN_ERR
"NFS: %s: id %u cl_exchange_flags 0x%x\n",
118 __func__
, id
, server
->nfs_client
->cl_exchange_flags
);
121 ld_type
= find_pnfs_driver(id
);
123 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX
, id
);
124 ld_type
= find_pnfs_driver(id
);
126 dprintk("%s: No pNFS module found for %u.\n",
131 server
->pnfs_curr_ld
= ld_type
;
132 if (ld_type
->set_layoutdriver
133 && ld_type
->set_layoutdriver(server
, mntfh
)) {
134 printk(KERN_ERR
"NFS: %s: Error initializing pNFS layout "
135 "driver %u.\n", __func__
, id
);
136 module_put(ld_type
->owner
);
139 /* Bump the MDS count */
140 atomic_inc(&server
->nfs_client
->cl_mds_count
);
142 dprintk("%s: pNFS module for %u set\n", __func__
, id
);
146 dprintk("%s: Using NFSv4 I/O\n", __func__
);
147 server
->pnfs_curr_ld
= NULL
;
151 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
153 int status
= -EINVAL
;
154 struct pnfs_layoutdriver_type
*tmp
;
156 if (ld_type
->id
== 0) {
157 printk(KERN_ERR
"NFS: %s id 0 is reserved\n", __func__
);
160 if (!ld_type
->alloc_lseg
|| !ld_type
->free_lseg
) {
161 printk(KERN_ERR
"NFS: %s Layout driver must provide "
162 "alloc_lseg and free_lseg.\n", __func__
);
166 spin_lock(&pnfs_spinlock
);
167 tmp
= find_pnfs_driver_locked(ld_type
->id
);
169 list_add(&ld_type
->pnfs_tblid
, &pnfs_modules_tbl
);
171 dprintk("%s Registering id:%u name:%s\n", __func__
, ld_type
->id
,
174 printk(KERN_ERR
"NFS: %s Module with id %d already loaded!\n",
175 __func__
, ld_type
->id
);
177 spin_unlock(&pnfs_spinlock
);
181 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver
);
184 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type
*ld_type
)
186 dprintk("%s Deregistering id:%u\n", __func__
, ld_type
->id
);
187 spin_lock(&pnfs_spinlock
);
188 list_del(&ld_type
->pnfs_tblid
);
189 spin_unlock(&pnfs_spinlock
);
191 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver
);
194 * pNFS client layout cache
197 /* Need to hold i_lock if caller does not already hold reference */
199 pnfs_get_layout_hdr(struct pnfs_layout_hdr
*lo
)
201 atomic_inc(&lo
->plh_refcount
);
204 static struct pnfs_layout_hdr
*
205 pnfs_alloc_layout_hdr(struct inode
*ino
, gfp_t gfp_flags
)
207 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(ino
)->pnfs_curr_ld
;
208 return ld
->alloc_layout_hdr(ino
, gfp_flags
);
212 pnfs_free_layout_hdr(struct pnfs_layout_hdr
*lo
)
214 struct nfs_server
*server
= NFS_SERVER(lo
->plh_inode
);
215 struct pnfs_layoutdriver_type
*ld
= server
->pnfs_curr_ld
;
217 if (!list_empty(&lo
->plh_layouts
)) {
218 struct nfs_client
*clp
= server
->nfs_client
;
220 spin_lock(&clp
->cl_lock
);
221 list_del_init(&lo
->plh_layouts
);
222 spin_unlock(&clp
->cl_lock
);
224 put_rpccred(lo
->plh_lc_cred
);
225 return ld
->free_layout_hdr(lo
);
229 pnfs_detach_layout_hdr(struct pnfs_layout_hdr
*lo
)
231 struct nfs_inode
*nfsi
= NFS_I(lo
->plh_inode
);
232 dprintk("%s: freeing layout cache %p\n", __func__
, lo
);
234 /* Reset MDS Threshold I/O counters */
240 pnfs_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
242 struct inode
*inode
= lo
->plh_inode
;
244 pnfs_layoutreturn_before_put_layout_hdr(lo
);
246 if (atomic_dec_and_lock(&lo
->plh_refcount
, &inode
->i_lock
)) {
247 if (!list_empty(&lo
->plh_segs
))
248 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
249 pnfs_detach_layout_hdr(lo
);
250 spin_unlock(&inode
->i_lock
);
251 pnfs_free_layout_hdr(lo
);
256 pnfs_iomode_to_fail_bit(u32 iomode
)
258 return iomode
== IOMODE_RW
?
259 NFS_LAYOUT_RW_FAILED
: NFS_LAYOUT_RO_FAILED
;
263 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
265 lo
->plh_retry_timestamp
= jiffies
;
266 if (!test_and_set_bit(fail_bit
, &lo
->plh_flags
))
267 atomic_inc(&lo
->plh_refcount
);
271 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr
*lo
, int fail_bit
)
273 if (test_and_clear_bit(fail_bit
, &lo
->plh_flags
))
274 atomic_dec(&lo
->plh_refcount
);
278 pnfs_layout_io_set_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
280 struct inode
*inode
= lo
->plh_inode
;
281 struct pnfs_layout_range range
= {
284 .length
= NFS4_MAX_UINT64
,
288 spin_lock(&inode
->i_lock
);
289 pnfs_layout_set_fail_bit(lo
, pnfs_iomode_to_fail_bit(iomode
));
290 pnfs_mark_matching_lsegs_invalid(lo
, &head
, &range
);
291 spin_unlock(&inode
->i_lock
);
292 pnfs_free_lseg_list(&head
);
293 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__
,
294 iomode
== IOMODE_RW
? "RW" : "READ");
298 pnfs_layout_io_test_failed(struct pnfs_layout_hdr
*lo
, u32 iomode
)
300 unsigned long start
, end
;
301 int fail_bit
= pnfs_iomode_to_fail_bit(iomode
);
303 if (test_bit(fail_bit
, &lo
->plh_flags
) == 0)
306 start
= end
- PNFS_LAYOUTGET_RETRY_TIMEOUT
;
307 if (!time_in_range(lo
->plh_retry_timestamp
, start
, end
)) {
308 /* It is time to retry the failed layoutgets */
309 pnfs_layout_clear_fail_bit(lo
, fail_bit
);
316 init_lseg(struct pnfs_layout_hdr
*lo
, struct pnfs_layout_segment
*lseg
)
318 INIT_LIST_HEAD(&lseg
->pls_list
);
319 INIT_LIST_HEAD(&lseg
->pls_lc_list
);
320 atomic_set(&lseg
->pls_refcount
, 1);
322 set_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
);
323 lseg
->pls_layout
= lo
;
326 static void pnfs_free_lseg(struct pnfs_layout_segment
*lseg
)
328 struct inode
*ino
= lseg
->pls_layout
->plh_inode
;
330 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
334 pnfs_layout_remove_lseg(struct pnfs_layout_hdr
*lo
,
335 struct pnfs_layout_segment
*lseg
)
337 struct inode
*inode
= lo
->plh_inode
;
339 WARN_ON(test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
340 list_del_init(&lseg
->pls_list
);
341 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
342 atomic_dec(&lo
->plh_refcount
);
343 if (list_empty(&lo
->plh_segs
))
344 clear_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
345 rpc_wake_up(&NFS_SERVER(inode
)->roc_rpcwaitq
);
349 pnfs_put_lseg(struct pnfs_layout_segment
*lseg
)
351 struct pnfs_layout_hdr
*lo
;
357 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
358 atomic_read(&lseg
->pls_refcount
),
359 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
361 lo
= lseg
->pls_layout
;
362 inode
= lo
->plh_inode
;
364 if (atomic_dec_and_lock(&lseg
->pls_refcount
, &inode
->i_lock
)) {
365 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
366 spin_unlock(&inode
->i_lock
);
369 pnfs_get_layout_hdr(lo
);
370 pnfs_layout_remove_lseg(lo
, lseg
);
371 spin_unlock(&inode
->i_lock
);
372 pnfs_free_lseg(lseg
);
373 pnfs_put_layout_hdr(lo
);
376 EXPORT_SYMBOL_GPL(pnfs_put_lseg
);
378 static void pnfs_free_lseg_async_work(struct work_struct
*work
)
380 struct pnfs_layout_segment
*lseg
;
381 struct pnfs_layout_hdr
*lo
;
383 lseg
= container_of(work
, struct pnfs_layout_segment
, pls_work
);
384 lo
= lseg
->pls_layout
;
386 pnfs_free_lseg(lseg
);
387 pnfs_put_layout_hdr(lo
);
390 static void pnfs_free_lseg_async(struct pnfs_layout_segment
*lseg
)
392 INIT_WORK(&lseg
->pls_work
, pnfs_free_lseg_async_work
);
393 schedule_work(&lseg
->pls_work
);
397 pnfs_put_lseg_locked(struct pnfs_layout_segment
*lseg
)
402 assert_spin_locked(&lseg
->pls_layout
->plh_inode
->i_lock
);
404 dprintk("%s: lseg %p ref %d valid %d\n", __func__
, lseg
,
405 atomic_read(&lseg
->pls_refcount
),
406 test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
));
407 if (atomic_dec_and_test(&lseg
->pls_refcount
)) {
408 struct pnfs_layout_hdr
*lo
= lseg
->pls_layout
;
409 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
))
411 pnfs_get_layout_hdr(lo
);
412 pnfs_layout_remove_lseg(lo
, lseg
);
413 pnfs_free_lseg_async(lseg
);
416 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked
);
419 end_offset(u64 start
, u64 len
)
424 return end
>= start
? end
: NFS4_MAX_UINT64
;
428 * is l2 fully contained in l1?
430 * [----------------------------------)
435 pnfs_lseg_range_contained(const struct pnfs_layout_range
*l1
,
436 const struct pnfs_layout_range
*l2
)
438 u64 start1
= l1
->offset
;
439 u64 end1
= end_offset(start1
, l1
->length
);
440 u64 start2
= l2
->offset
;
441 u64 end2
= end_offset(start2
, l2
->length
);
443 return (start1
<= start2
) && (end1
>= end2
);
447 * is l1 and l2 intersecting?
449 * [----------------------------------)
454 pnfs_lseg_range_intersecting(const struct pnfs_layout_range
*l1
,
455 const struct pnfs_layout_range
*l2
)
457 u64 start1
= l1
->offset
;
458 u64 end1
= end_offset(start1
, l1
->length
);
459 u64 start2
= l2
->offset
;
460 u64 end2
= end_offset(start2
, l2
->length
);
462 return (end1
== NFS4_MAX_UINT64
|| end1
> start2
) &&
463 (end2
== NFS4_MAX_UINT64
|| end2
> start1
);
467 should_free_lseg(const struct pnfs_layout_range
*lseg_range
,
468 const struct pnfs_layout_range
*recall_range
)
470 return (recall_range
->iomode
== IOMODE_ANY
||
471 lseg_range
->iomode
== recall_range
->iomode
) &&
472 pnfs_lseg_range_intersecting(lseg_range
, recall_range
);
475 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment
*lseg
,
476 struct list_head
*tmp_list
)
478 if (!atomic_dec_and_test(&lseg
->pls_refcount
))
480 pnfs_layout_remove_lseg(lseg
->pls_layout
, lseg
);
481 list_add(&lseg
->pls_list
, tmp_list
);
485 /* Returns 1 if lseg is removed from list, 0 otherwise */
486 static int mark_lseg_invalid(struct pnfs_layout_segment
*lseg
,
487 struct list_head
*tmp_list
)
491 if (test_and_clear_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
)) {
492 /* Remove the reference keeping the lseg in the
493 * list. It will now be removed when all
494 * outstanding io is finished.
496 dprintk("%s: lseg %p ref %d\n", __func__
, lseg
,
497 atomic_read(&lseg
->pls_refcount
));
498 if (pnfs_lseg_dec_and_remove_zero(lseg
, tmp_list
))
504 /* Returns count of number of matching invalid lsegs remaining in list
508 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr
*lo
,
509 struct list_head
*tmp_list
,
510 const struct pnfs_layout_range
*recall_range
)
512 struct pnfs_layout_segment
*lseg
, *next
;
515 dprintk("%s:Begin lo %p\n", __func__
, lo
);
517 if (list_empty(&lo
->plh_segs
))
519 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
521 should_free_lseg(&lseg
->pls_range
, recall_range
)) {
522 dprintk("%s: freeing lseg %p iomode %d "
523 "offset %llu length %llu\n", __func__
,
524 lseg
, lseg
->pls_range
.iomode
, lseg
->pls_range
.offset
,
525 lseg
->pls_range
.length
);
526 if (!mark_lseg_invalid(lseg
, tmp_list
))
529 dprintk("%s:Return %i\n", __func__
, remaining
);
533 /* note free_me must contain lsegs from a single layout_hdr */
535 pnfs_free_lseg_list(struct list_head
*free_me
)
537 struct pnfs_layout_segment
*lseg
, *tmp
;
539 if (list_empty(free_me
))
542 list_for_each_entry_safe(lseg
, tmp
, free_me
, pls_list
) {
543 list_del(&lseg
->pls_list
);
544 pnfs_free_lseg(lseg
);
549 pnfs_destroy_layout(struct nfs_inode
*nfsi
)
551 struct pnfs_layout_hdr
*lo
;
554 spin_lock(&nfsi
->vfs_inode
.i_lock
);
557 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
558 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
559 pnfs_get_layout_hdr(lo
);
560 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RO_FAILED
);
561 pnfs_layout_clear_fail_bit(lo
, NFS_LAYOUT_RW_FAILED
);
562 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
563 pnfs_free_lseg_list(&tmp_list
);
564 pnfs_put_layout_hdr(lo
);
566 spin_unlock(&nfsi
->vfs_inode
.i_lock
);
568 EXPORT_SYMBOL_GPL(pnfs_destroy_layout
);
571 pnfs_layout_add_bulk_destroy_list(struct inode
*inode
,
572 struct list_head
*layout_list
)
574 struct pnfs_layout_hdr
*lo
;
577 spin_lock(&inode
->i_lock
);
578 lo
= NFS_I(inode
)->layout
;
579 if (lo
!= NULL
&& list_empty(&lo
->plh_bulk_destroy
)) {
580 pnfs_get_layout_hdr(lo
);
581 list_add(&lo
->plh_bulk_destroy
, layout_list
);
584 spin_unlock(&inode
->i_lock
);
588 /* Caller must hold rcu_read_lock and clp->cl_lock */
590 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client
*clp
,
591 struct nfs_server
*server
,
592 struct list_head
*layout_list
)
594 struct pnfs_layout_hdr
*lo
, *next
;
597 list_for_each_entry_safe(lo
, next
, &server
->layouts
, plh_layouts
) {
598 inode
= igrab(lo
->plh_inode
);
601 list_del_init(&lo
->plh_layouts
);
602 if (pnfs_layout_add_bulk_destroy_list(inode
, layout_list
))
605 spin_unlock(&clp
->cl_lock
);
607 spin_lock(&clp
->cl_lock
);
615 pnfs_layout_free_bulk_destroy_list(struct list_head
*layout_list
,
618 struct pnfs_layout_hdr
*lo
;
620 struct pnfs_layout_range range
= {
621 .iomode
= IOMODE_ANY
,
623 .length
= NFS4_MAX_UINT64
,
625 LIST_HEAD(lseg_list
);
628 while (!list_empty(layout_list
)) {
629 lo
= list_entry(layout_list
->next
, struct pnfs_layout_hdr
,
631 dprintk("%s freeing layout for inode %lu\n", __func__
,
632 lo
->plh_inode
->i_ino
);
633 inode
= lo
->plh_inode
;
635 pnfs_layoutcommit_inode(inode
, false);
637 spin_lock(&inode
->i_lock
);
638 list_del_init(&lo
->plh_bulk_destroy
);
639 lo
->plh_block_lgets
++; /* permanently block new LAYOUTGETs */
641 set_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
642 if (pnfs_mark_matching_lsegs_invalid(lo
, &lseg_list
, &range
))
644 spin_unlock(&inode
->i_lock
);
645 pnfs_free_lseg_list(&lseg_list
);
646 /* Free all lsegs that are attached to commit buckets */
647 nfs_commit_inode(inode
, 0);
648 pnfs_put_layout_hdr(lo
);
655 pnfs_destroy_layouts_byfsid(struct nfs_client
*clp
,
656 struct nfs_fsid
*fsid
,
659 struct nfs_server
*server
;
660 LIST_HEAD(layout_list
);
662 spin_lock(&clp
->cl_lock
);
665 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
666 if (memcmp(&server
->fsid
, fsid
, sizeof(*fsid
)) != 0)
668 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
674 spin_unlock(&clp
->cl_lock
);
676 if (list_empty(&layout_list
))
678 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
682 pnfs_destroy_layouts_byclid(struct nfs_client
*clp
,
685 struct nfs_server
*server
;
686 LIST_HEAD(layout_list
);
688 spin_lock(&clp
->cl_lock
);
691 list_for_each_entry_rcu(server
, &clp
->cl_superblocks
, client_link
) {
692 if (pnfs_layout_bulk_destroy_byserver_locked(clp
,
698 spin_unlock(&clp
->cl_lock
);
700 if (list_empty(&layout_list
))
702 return pnfs_layout_free_bulk_destroy_list(&layout_list
, is_recall
);
706 * Called by the state manger to remove all layouts established under an
710 pnfs_destroy_all_layouts(struct nfs_client
*clp
)
712 nfs4_deviceid_mark_client_invalid(clp
);
713 nfs4_deviceid_purge_client(clp
);
715 pnfs_destroy_layouts_byclid(clp
, false);
719 * Compare 2 layout stateid sequence ids, to see which is newer,
720 * taking into account wraparound issues.
722 static bool pnfs_seqid_is_newer(u32 s1
, u32 s2
)
724 return (s32
)(s1
- s2
) > 0;
727 /* update lo->plh_stateid with new if is more recent */
729 pnfs_set_layout_stateid(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*new,
732 u32 oldseq
, newseq
, new_barrier
;
733 int empty
= list_empty(&lo
->plh_segs
);
735 oldseq
= be32_to_cpu(lo
->plh_stateid
.seqid
);
736 newseq
= be32_to_cpu(new->seqid
);
737 if (empty
|| pnfs_seqid_is_newer(newseq
, oldseq
)) {
738 nfs4_stateid_copy(&lo
->plh_stateid
, new);
739 if (update_barrier
) {
740 new_barrier
= be32_to_cpu(new->seqid
);
742 /* Because of wraparound, we want to keep the barrier
743 * "close" to the current seqids.
745 new_barrier
= newseq
- atomic_read(&lo
->plh_outstanding
);
747 if (empty
|| pnfs_seqid_is_newer(new_barrier
, lo
->plh_barrier
))
748 lo
->plh_barrier
= new_barrier
;
753 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr
*lo
,
754 const nfs4_stateid
*stateid
)
756 u32 seqid
= be32_to_cpu(stateid
->seqid
);
758 return !pnfs_seqid_is_newer(seqid
, lo
->plh_barrier
);
761 /* lget is set to 1 if called from inside send_layoutget call chain */
763 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr
*lo
)
765 return lo
->plh_block_lgets
||
766 test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
);
770 pnfs_choose_layoutget_stateid(nfs4_stateid
*dst
, struct pnfs_layout_hdr
*lo
,
771 const struct pnfs_layout_range
*range
,
772 struct nfs4_state
*open_state
)
776 dprintk("--> %s\n", __func__
);
777 spin_lock(&lo
->plh_inode
->i_lock
);
778 if (pnfs_layoutgets_blocked(lo
)) {
780 } else if (!nfs4_valid_open_stateid(open_state
)) {
782 } else if (list_empty(&lo
->plh_segs
) ||
783 test_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
)) {
787 seq
= read_seqbegin(&open_state
->seqlock
);
788 nfs4_stateid_copy(dst
, &open_state
->stateid
);
789 } while (read_seqretry(&open_state
->seqlock
, seq
));
791 nfs4_stateid_copy(dst
, &lo
->plh_stateid
);
792 spin_unlock(&lo
->plh_inode
->i_lock
);
793 dprintk("<-- %s\n", __func__
);
798 * Get layout from server.
799 * for now, assume that whole file layouts are requested.
801 * arg->length: all ones
803 static struct pnfs_layout_segment
*
804 send_layoutget(struct pnfs_layout_hdr
*lo
,
805 struct nfs_open_context
*ctx
,
806 const struct pnfs_layout_range
*range
,
809 struct inode
*ino
= lo
->plh_inode
;
810 struct nfs_server
*server
= NFS_SERVER(ino
);
811 struct nfs4_layoutget
*lgp
;
812 struct pnfs_layout_segment
*lseg
;
815 dprintk("--> %s\n", __func__
);
818 * Synchronously retrieve layout information from server and
819 * store in lseg. If we race with a concurrent seqid morphing
820 * op, then re-send the LAYOUTGET.
823 lgp
= kzalloc(sizeof(*lgp
), gfp_flags
);
827 i_size
= i_size_read(ino
);
829 lgp
->args
.minlength
= PAGE_CACHE_SIZE
;
830 if (lgp
->args
.minlength
> range
->length
)
831 lgp
->args
.minlength
= range
->length
;
832 if (range
->iomode
== IOMODE_READ
) {
833 if (range
->offset
>= i_size
)
834 lgp
->args
.minlength
= 0;
835 else if (i_size
- range
->offset
< lgp
->args
.minlength
)
836 lgp
->args
.minlength
= i_size
- range
->offset
;
838 lgp
->args
.maxcount
= PNFS_LAYOUT_MAXSIZE
;
839 pnfs_copy_range(&lgp
->args
.range
, range
);
840 lgp
->args
.type
= server
->pnfs_curr_ld
->id
;
841 lgp
->args
.inode
= ino
;
842 lgp
->args
.ctx
= get_nfs_open_context(ctx
);
843 lgp
->gfp_flags
= gfp_flags
;
844 lgp
->cred
= lo
->plh_lc_cred
;
846 lseg
= nfs4_proc_layoutget(lgp
, gfp_flags
);
847 } while (lseg
== ERR_PTR(-EAGAIN
));
849 if (IS_ERR(lseg
) && !nfs_error_is_fatal(PTR_ERR(lseg
)))
852 pnfs_layout_clear_fail_bit(lo
,
853 pnfs_iomode_to_fail_bit(range
->iomode
));
858 static void pnfs_clear_layoutcommit(struct inode
*inode
,
859 struct list_head
*head
)
861 struct nfs_inode
*nfsi
= NFS_I(inode
);
862 struct pnfs_layout_segment
*lseg
, *tmp
;
864 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
866 list_for_each_entry_safe(lseg
, tmp
, &nfsi
->layout
->plh_segs
, pls_list
) {
867 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
869 pnfs_lseg_dec_and_remove_zero(lseg
, head
);
873 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr
*lo
)
875 clear_bit_unlock(NFS_LAYOUT_RETURN
, &lo
->plh_flags
);
876 smp_mb__after_atomic();
877 wake_up_bit(&lo
->plh_flags
, NFS_LAYOUT_RETURN
);
878 rpc_wake_up(&NFS_SERVER(lo
->plh_inode
)->roc_rpcwaitq
);
882 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr
*lo
)
884 if (test_and_set_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
))
886 lo
->plh_return_iomode
= 0;
887 pnfs_get_layout_hdr(lo
);
888 clear_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
);
893 pnfs_send_layoutreturn(struct pnfs_layout_hdr
*lo
, const nfs4_stateid
*stateid
,
894 enum pnfs_iomode iomode
, bool sync
)
896 struct inode
*ino
= lo
->plh_inode
;
897 struct nfs4_layoutreturn
*lrp
;
900 lrp
= kzalloc(sizeof(*lrp
), GFP_NOFS
);
901 if (unlikely(lrp
== NULL
)) {
903 spin_lock(&ino
->i_lock
);
904 pnfs_clear_layoutreturn_waitbit(lo
);
905 spin_unlock(&ino
->i_lock
);
906 pnfs_put_layout_hdr(lo
);
910 nfs4_stateid_copy(&lrp
->args
.stateid
, stateid
);
911 lrp
->args
.layout_type
= NFS_SERVER(ino
)->pnfs_curr_ld
->id
;
912 lrp
->args
.inode
= ino
;
913 lrp
->args
.range
.iomode
= iomode
;
914 lrp
->args
.range
.offset
= 0;
915 lrp
->args
.range
.length
= NFS4_MAX_UINT64
;
916 lrp
->args
.layout
= lo
;
917 lrp
->clp
= NFS_SERVER(ino
)->nfs_client
;
918 lrp
->cred
= lo
->plh_lc_cred
;
920 status
= nfs4_proc_layoutreturn(lrp
, sync
);
922 dprintk("<-- %s status: %d\n", __func__
, status
);
926 /* Return true if layoutreturn is needed */
928 pnfs_layout_need_return(struct pnfs_layout_hdr
*lo
)
930 struct pnfs_layout_segment
*s
;
932 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
935 /* Defer layoutreturn until all lsegs are done */
936 list_for_each_entry(s
, &lo
->plh_segs
, pls_list
) {
937 if (test_bit(NFS_LSEG_LAYOUTRETURN
, &s
->pls_flags
))
944 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr
*lo
)
946 struct inode
*inode
= lo
->plh_inode
;
948 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED
, &lo
->plh_flags
))
950 spin_lock(&inode
->i_lock
);
951 if (pnfs_layout_need_return(lo
)) {
952 nfs4_stateid stateid
;
953 enum pnfs_iomode iomode
;
956 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
957 iomode
= lo
->plh_return_iomode
;
958 send
= pnfs_prepare_layoutreturn(lo
);
959 spin_unlock(&inode
->i_lock
);
961 /* Send an async layoutreturn so we dont deadlock */
962 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, false);
965 spin_unlock(&inode
->i_lock
);
969 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr
970 * when the layout segment list is empty.
972 * Note that a pnfs_layout_hdr can exist with an empty layout segment
973 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the
974 * deviceid is marked invalid.
977 _pnfs_return_layout(struct inode
*ino
)
979 struct pnfs_layout_hdr
*lo
= NULL
;
980 struct nfs_inode
*nfsi
= NFS_I(ino
);
982 nfs4_stateid stateid
;
983 int status
= 0, empty
;
986 dprintk("NFS: %s for inode %lu\n", __func__
, ino
->i_ino
);
988 spin_lock(&ino
->i_lock
);
991 spin_unlock(&ino
->i_lock
);
992 dprintk("NFS: %s no layout to return\n", __func__
);
995 nfs4_stateid_copy(&stateid
, &nfsi
->layout
->plh_stateid
);
996 /* Reference matched in nfs4_layoutreturn_release */
997 pnfs_get_layout_hdr(lo
);
998 empty
= list_empty(&lo
->plh_segs
);
999 pnfs_clear_layoutcommit(ino
, &tmp_list
);
1000 pnfs_mark_matching_lsegs_invalid(lo
, &tmp_list
, NULL
);
1002 if (NFS_SERVER(ino
)->pnfs_curr_ld
->return_range
) {
1003 struct pnfs_layout_range range
= {
1004 .iomode
= IOMODE_ANY
,
1006 .length
= NFS4_MAX_UINT64
,
1008 NFS_SERVER(ino
)->pnfs_curr_ld
->return_range(lo
, &range
);
1011 /* Don't send a LAYOUTRETURN if list was initially empty */
1013 spin_unlock(&ino
->i_lock
);
1014 dprintk("NFS: %s no layout segments to return\n", __func__
);
1015 goto out_put_layout_hdr
;
1018 set_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1019 send
= pnfs_prepare_layoutreturn(lo
);
1020 spin_unlock(&ino
->i_lock
);
1021 pnfs_free_lseg_list(&tmp_list
);
1023 status
= pnfs_send_layoutreturn(lo
, &stateid
, IOMODE_ANY
, true);
1025 pnfs_put_layout_hdr(lo
);
1027 dprintk("<-- %s status: %d\n", __func__
, status
);
1030 EXPORT_SYMBOL_GPL(_pnfs_return_layout
);
1033 pnfs_commit_and_return_layout(struct inode
*inode
)
1035 struct pnfs_layout_hdr
*lo
;
1038 spin_lock(&inode
->i_lock
);
1039 lo
= NFS_I(inode
)->layout
;
1041 spin_unlock(&inode
->i_lock
);
1044 pnfs_get_layout_hdr(lo
);
1045 /* Block new layoutgets and read/write to ds */
1046 lo
->plh_block_lgets
++;
1047 spin_unlock(&inode
->i_lock
);
1048 filemap_fdatawait(inode
->i_mapping
);
1049 ret
= pnfs_layoutcommit_inode(inode
, true);
1051 ret
= _pnfs_return_layout(inode
);
1052 spin_lock(&inode
->i_lock
);
1053 lo
->plh_block_lgets
--;
1054 spin_unlock(&inode
->i_lock
);
1055 pnfs_put_layout_hdr(lo
);
1059 bool pnfs_roc(struct inode
*ino
)
1061 struct nfs_inode
*nfsi
= NFS_I(ino
);
1062 struct nfs_open_context
*ctx
;
1063 struct nfs4_state
*state
;
1064 struct pnfs_layout_hdr
*lo
;
1065 struct pnfs_layout_segment
*lseg
, *tmp
;
1066 nfs4_stateid stateid
;
1067 LIST_HEAD(tmp_list
);
1068 bool found
= false, layoutreturn
= false, roc
= false;
1070 spin_lock(&ino
->i_lock
);
1072 if (!lo
|| test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
))
1075 /* no roc if we hold a delegation */
1076 if (nfs4_check_delegation(ino
, FMODE_READ
))
1079 list_for_each_entry(ctx
, &nfsi
->open_files
, list
) {
1081 /* Don't return layout if there is open file state */
1082 if (state
!= NULL
&& state
->state
!= 0)
1086 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
1087 /* always send layoutreturn if being marked so */
1088 if (test_and_clear_bit(NFS_LAYOUT_RETURN_REQUESTED
,
1090 layoutreturn
= pnfs_prepare_layoutreturn(lo
);
1092 list_for_each_entry_safe(lseg
, tmp
, &lo
->plh_segs
, pls_list
)
1093 /* If we are sending layoutreturn, invalidate all valid lsegs */
1094 if (layoutreturn
|| test_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
)) {
1095 mark_lseg_invalid(lseg
, &tmp_list
);
1098 /* ROC in two conditions:
1099 * 1. there are ROC lsegs
1100 * 2. we don't send layoutreturn
1102 if (found
&& !layoutreturn
) {
1103 /* lo ref dropped in pnfs_roc_release() */
1104 pnfs_get_layout_hdr(lo
);
1109 spin_unlock(&ino
->i_lock
);
1110 pnfs_free_lseg_list(&tmp_list
);
1111 pnfs_layoutcommit_inode(ino
, true);
1113 pnfs_send_layoutreturn(lo
, &stateid
, IOMODE_ANY
, true);
1117 void pnfs_roc_release(struct inode
*ino
)
1119 struct pnfs_layout_hdr
*lo
;
1121 spin_lock(&ino
->i_lock
);
1122 lo
= NFS_I(ino
)->layout
;
1123 pnfs_clear_layoutreturn_waitbit(lo
);
1124 if (atomic_dec_and_test(&lo
->plh_refcount
)) {
1125 pnfs_detach_layout_hdr(lo
);
1126 spin_unlock(&ino
->i_lock
);
1127 pnfs_free_layout_hdr(lo
);
1129 spin_unlock(&ino
->i_lock
);
1132 void pnfs_roc_set_barrier(struct inode
*ino
, u32 barrier
)
1134 struct pnfs_layout_hdr
*lo
;
1136 spin_lock(&ino
->i_lock
);
1137 lo
= NFS_I(ino
)->layout
;
1138 pnfs_mark_layout_returned_if_empty(lo
);
1139 if (pnfs_seqid_is_newer(barrier
, lo
->plh_barrier
))
1140 lo
->plh_barrier
= barrier
;
1141 spin_unlock(&ino
->i_lock
);
1142 trace_nfs4_layoutreturn_on_close(ino
, 0);
1145 void pnfs_roc_get_barrier(struct inode
*ino
, u32
*barrier
)
1147 struct nfs_inode
*nfsi
= NFS_I(ino
);
1148 struct pnfs_layout_hdr
*lo
;
1151 spin_lock(&ino
->i_lock
);
1153 current_seqid
= be32_to_cpu(lo
->plh_stateid
.seqid
);
1155 /* Since close does not return a layout stateid for use as
1156 * a barrier, we choose the worst-case barrier.
1158 *barrier
= current_seqid
+ atomic_read(&lo
->plh_outstanding
);
1159 spin_unlock(&ino
->i_lock
);
1162 bool pnfs_wait_on_layoutreturn(struct inode
*ino
, struct rpc_task
*task
)
1164 struct nfs_inode
*nfsi
= NFS_I(ino
);
1165 struct pnfs_layout_hdr
*lo
;
1168 /* we might not have grabbed lo reference. so need to check under
1170 spin_lock(&ino
->i_lock
);
1172 if (lo
&& test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
))
1174 spin_unlock(&ino
->i_lock
);
1177 rpc_sleep_on(&NFS_SERVER(ino
)->roc_rpcwaitq
, task
, NULL
);
1183 * Compare two layout segments for sorting into layout cache.
1184 * We want to preferentially return RW over RO layouts, so ensure those
1188 pnfs_lseg_range_cmp(const struct pnfs_layout_range
*l1
,
1189 const struct pnfs_layout_range
*l2
)
1193 /* high offset > low offset */
1194 d
= l1
->offset
- l2
->offset
;
1198 /* short length > long length */
1199 d
= l2
->length
- l1
->length
;
1203 /* read > read/write */
1204 return (int)(l1
->iomode
== IOMODE_READ
) - (int)(l2
->iomode
== IOMODE_READ
);
1208 pnfs_lseg_range_is_after(const struct pnfs_layout_range
*l1
,
1209 const struct pnfs_layout_range
*l2
)
1211 return pnfs_lseg_range_cmp(l1
, l2
) > 0;
1215 pnfs_lseg_no_merge(struct pnfs_layout_segment
*lseg
,
1216 struct pnfs_layout_segment
*old
)
1222 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1223 struct pnfs_layout_segment
*lseg
,
1224 bool (*is_after
)(const struct pnfs_layout_range
*,
1225 const struct pnfs_layout_range
*),
1226 bool (*do_merge
)(struct pnfs_layout_segment
*,
1227 struct pnfs_layout_segment
*),
1228 struct list_head
*free_me
)
1230 struct pnfs_layout_segment
*lp
, *tmp
;
1232 dprintk("%s:Begin\n", __func__
);
1234 list_for_each_entry_safe(lp
, tmp
, &lo
->plh_segs
, pls_list
) {
1235 if (test_bit(NFS_LSEG_VALID
, &lp
->pls_flags
) == 0)
1237 if (do_merge(lseg
, lp
)) {
1238 mark_lseg_invalid(lp
, free_me
);
1241 if (is_after(&lseg
->pls_range
, &lp
->pls_range
))
1243 list_add_tail(&lseg
->pls_list
, &lp
->pls_list
);
1244 dprintk("%s: inserted lseg %p "
1245 "iomode %d offset %llu length %llu before "
1246 "lp %p iomode %d offset %llu length %llu\n",
1247 __func__
, lseg
, lseg
->pls_range
.iomode
,
1248 lseg
->pls_range
.offset
, lseg
->pls_range
.length
,
1249 lp
, lp
->pls_range
.iomode
, lp
->pls_range
.offset
,
1250 lp
->pls_range
.length
);
1253 list_add_tail(&lseg
->pls_list
, &lo
->plh_segs
);
1254 dprintk("%s: inserted lseg %p "
1255 "iomode %d offset %llu length %llu at tail\n",
1256 __func__
, lseg
, lseg
->pls_range
.iomode
,
1257 lseg
->pls_range
.offset
, lseg
->pls_range
.length
);
1259 pnfs_get_layout_hdr(lo
);
1261 dprintk("%s:Return\n", __func__
);
1263 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg
);
1266 pnfs_layout_insert_lseg(struct pnfs_layout_hdr
*lo
,
1267 struct pnfs_layout_segment
*lseg
,
1268 struct list_head
*free_me
)
1270 struct inode
*inode
= lo
->plh_inode
;
1271 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
1273 if (ld
->add_lseg
!= NULL
)
1274 ld
->add_lseg(lo
, lseg
, free_me
);
1276 pnfs_generic_layout_insert_lseg(lo
, lseg
,
1277 pnfs_lseg_range_is_after
,
1282 static struct pnfs_layout_hdr
*
1283 alloc_init_layout_hdr(struct inode
*ino
,
1284 struct nfs_open_context
*ctx
,
1287 struct pnfs_layout_hdr
*lo
;
1289 lo
= pnfs_alloc_layout_hdr(ino
, gfp_flags
);
1292 atomic_set(&lo
->plh_refcount
, 1);
1293 INIT_LIST_HEAD(&lo
->plh_layouts
);
1294 INIT_LIST_HEAD(&lo
->plh_segs
);
1295 INIT_LIST_HEAD(&lo
->plh_bulk_destroy
);
1296 lo
->plh_inode
= ino
;
1297 lo
->plh_lc_cred
= get_rpccred(ctx
->cred
);
1301 static struct pnfs_layout_hdr
*
1302 pnfs_find_alloc_layout(struct inode
*ino
,
1303 struct nfs_open_context
*ctx
,
1306 struct nfs_inode
*nfsi
= NFS_I(ino
);
1307 struct pnfs_layout_hdr
*new = NULL
;
1309 dprintk("%s Begin ino=%p layout=%p\n", __func__
, ino
, nfsi
->layout
);
1311 if (nfsi
->layout
!= NULL
)
1313 spin_unlock(&ino
->i_lock
);
1314 new = alloc_init_layout_hdr(ino
, ctx
, gfp_flags
);
1315 spin_lock(&ino
->i_lock
);
1317 if (likely(nfsi
->layout
== NULL
)) { /* Won the race? */
1320 } else if (new != NULL
)
1321 pnfs_free_layout_hdr(new);
1323 pnfs_get_layout_hdr(nfsi
->layout
);
1324 return nfsi
->layout
;
1328 * iomode matching rules:
1339 pnfs_lseg_range_match(const struct pnfs_layout_range
*ls_range
,
1340 const struct pnfs_layout_range
*range
)
1342 struct pnfs_layout_range range1
;
1344 if ((range
->iomode
== IOMODE_RW
&&
1345 ls_range
->iomode
!= IOMODE_RW
) ||
1346 !pnfs_lseg_range_intersecting(ls_range
, range
))
1349 /* range1 covers only the first byte in the range */
1352 return pnfs_lseg_range_contained(ls_range
, &range1
);
1356 * lookup range in layout
1358 static struct pnfs_layout_segment
*
1359 pnfs_find_lseg(struct pnfs_layout_hdr
*lo
,
1360 struct pnfs_layout_range
*range
)
1362 struct pnfs_layout_segment
*lseg
, *ret
= NULL
;
1364 dprintk("%s:Begin\n", __func__
);
1366 list_for_each_entry(lseg
, &lo
->plh_segs
, pls_list
) {
1367 if (test_bit(NFS_LSEG_VALID
, &lseg
->pls_flags
) &&
1368 !test_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
) &&
1369 pnfs_lseg_range_match(&lseg
->pls_range
, range
)) {
1370 ret
= pnfs_get_lseg(lseg
);
1375 dprintk("%s:Return lseg %p ref %d\n",
1376 __func__
, ret
, ret
? atomic_read(&ret
->pls_refcount
) : 0);
1381 * Use mdsthreshold hints set at each OPEN to determine if I/O should go
1382 * to the MDS or over pNFS
1384 * The nfs_inode read_io and write_io fields are cumulative counters reset
1385 * when there are no layout segments. Note that in pnfs_update_layout iomode
1386 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a
1389 * A return of true means use MDS I/O.
1392 * If a file's size is smaller than the file size threshold, data accesses
1393 * SHOULD be sent to the metadata server. If an I/O request has a length that
1394 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata
1395 * server. If both file size and I/O size are provided, the client SHOULD
1396 * reach or exceed both thresholds before sending its read or write
1397 * requests to the data server.
1399 static bool pnfs_within_mdsthreshold(struct nfs_open_context
*ctx
,
1400 struct inode
*ino
, int iomode
)
1402 struct nfs4_threshold
*t
= ctx
->mdsthreshold
;
1403 struct nfs_inode
*nfsi
= NFS_I(ino
);
1404 loff_t fsize
= i_size_read(ino
);
1405 bool size
= false, size_set
= false, io
= false, io_set
= false, ret
= false;
1410 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
1411 __func__
, t
->bm
, t
->rd_sz
, t
->wr_sz
, t
->rd_io_sz
, t
->wr_io_sz
);
1415 if (t
->bm
& THRESHOLD_RD
) {
1416 dprintk("%s fsize %llu\n", __func__
, fsize
);
1418 if (fsize
< t
->rd_sz
)
1421 if (t
->bm
& THRESHOLD_RD_IO
) {
1422 dprintk("%s nfsi->read_io %llu\n", __func__
,
1425 if (nfsi
->read_io
< t
->rd_io_sz
)
1430 if (t
->bm
& THRESHOLD_WR
) {
1431 dprintk("%s fsize %llu\n", __func__
, fsize
);
1433 if (fsize
< t
->wr_sz
)
1436 if (t
->bm
& THRESHOLD_WR_IO
) {
1437 dprintk("%s nfsi->write_io %llu\n", __func__
,
1440 if (nfsi
->write_io
< t
->wr_io_sz
)
1445 if (size_set
&& io_set
) {
1448 } else if (size
|| io
)
1451 dprintk("<-- %s size %d io %d ret %d\n", __func__
, size
, io
, ret
);
1455 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr
*lo
)
1458 * send layoutcommit as it can hold up layoutreturn due to lseg
1461 pnfs_layoutcommit_inode(lo
->plh_inode
, false);
1462 return !wait_on_bit_action(&lo
->plh_flags
, NFS_LAYOUT_RETURN
,
1463 nfs_wait_bit_killable
,
1464 TASK_UNINTERRUPTIBLE
);
1467 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr
*lo
)
1469 unsigned long *bitlock
= &lo
->plh_flags
;
1471 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET
, bitlock
);
1472 smp_mb__after_atomic();
1473 wake_up_bit(bitlock
, NFS_LAYOUT_FIRST_LAYOUTGET
);
1477 * Layout segment is retreived from the server if not cached.
1478 * The appropriate layout segment is referenced and returned to the caller.
1480 struct pnfs_layout_segment
*
1481 pnfs_update_layout(struct inode
*ino
,
1482 struct nfs_open_context
*ctx
,
1485 enum pnfs_iomode iomode
,
1488 struct pnfs_layout_range arg
= {
1494 struct nfs_server
*server
= NFS_SERVER(ino
);
1495 struct nfs_client
*clp
= server
->nfs_client
;
1496 struct pnfs_layout_hdr
*lo
;
1497 struct pnfs_layout_segment
*lseg
= NULL
;
1500 if (!pnfs_enabled_sb(NFS_SERVER(ino
))) {
1501 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, NULL
,
1502 PNFS_UPDATE_LAYOUT_NO_PNFS
);
1506 if (iomode
== IOMODE_READ
&& i_size_read(ino
) == 0) {
1507 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, NULL
,
1508 PNFS_UPDATE_LAYOUT_RD_ZEROLEN
);
1512 if (pnfs_within_mdsthreshold(ctx
, ino
, iomode
)) {
1513 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, NULL
,
1514 PNFS_UPDATE_LAYOUT_MDSTHRESH
);
1520 spin_lock(&ino
->i_lock
);
1521 lo
= pnfs_find_alloc_layout(ino
, ctx
, gfp_flags
);
1523 spin_unlock(&ino
->i_lock
);
1524 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, NULL
,
1525 PNFS_UPDATE_LAYOUT_NOMEM
);
1529 /* Do we even need to bother with this? */
1530 if (test_bit(NFS_LAYOUT_BULK_RECALL
, &lo
->plh_flags
)) {
1531 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1532 PNFS_UPDATE_LAYOUT_BULK_RECALL
);
1533 dprintk("%s matches recall, use MDS\n", __func__
);
1537 /* if LAYOUTGET already failed once we don't try again */
1538 if (pnfs_layout_io_test_failed(lo
, iomode
)) {
1539 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1540 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL
);
1544 first
= list_empty(&lo
->plh_segs
);
1546 /* The first layoutget for the file. Need to serialize per
1547 * RFC 5661 Errata 3208.
1549 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET
,
1551 spin_unlock(&ino
->i_lock
);
1552 wait_on_bit(&lo
->plh_flags
, NFS_LAYOUT_FIRST_LAYOUTGET
,
1553 TASK_UNINTERRUPTIBLE
);
1554 pnfs_put_layout_hdr(lo
);
1558 /* Check to see if the layout for the given range
1561 lseg
= pnfs_find_lseg(lo
, &arg
);
1563 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1564 PNFS_UPDATE_LAYOUT_FOUND_CACHED
);
1570 * Because we free lsegs before sending LAYOUTRETURN, we need to wait
1571 * for LAYOUTRETURN even if first is true.
1573 if (test_bit(NFS_LAYOUT_RETURN
, &lo
->plh_flags
)) {
1574 spin_unlock(&ino
->i_lock
);
1575 dprintk("%s wait for layoutreturn\n", __func__
);
1576 if (pnfs_prepare_to_retry_layoutget(lo
)) {
1578 pnfs_clear_first_layoutget(lo
);
1579 pnfs_put_layout_hdr(lo
);
1580 dprintk("%s retrying\n", __func__
);
1583 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1584 PNFS_UPDATE_LAYOUT_RETURN
);
1585 goto out_put_layout_hdr
;
1588 if (pnfs_layoutgets_blocked(lo
)) {
1589 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1590 PNFS_UPDATE_LAYOUT_BLOCKED
);
1593 atomic_inc(&lo
->plh_outstanding
);
1594 spin_unlock(&ino
->i_lock
);
1596 if (list_empty(&lo
->plh_layouts
)) {
1597 /* The lo must be on the clp list if there is any
1598 * chance of a CB_LAYOUTRECALL(FILE) coming in.
1600 spin_lock(&clp
->cl_lock
);
1601 if (list_empty(&lo
->plh_layouts
))
1602 list_add_tail(&lo
->plh_layouts
, &server
->layouts
);
1603 spin_unlock(&clp
->cl_lock
);
1606 pg_offset
= arg
.offset
& ~PAGE_CACHE_MASK
;
1608 arg
.offset
-= pg_offset
;
1609 arg
.length
+= pg_offset
;
1611 if (arg
.length
!= NFS4_MAX_UINT64
)
1612 arg
.length
= PAGE_CACHE_ALIGN(arg
.length
);
1614 lseg
= send_layoutget(lo
, ctx
, &arg
, gfp_flags
);
1615 atomic_dec(&lo
->plh_outstanding
);
1616 trace_pnfs_update_layout(ino
, pos
, count
, iomode
, lo
,
1617 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET
);
1620 pnfs_clear_first_layoutget(lo
);
1621 pnfs_put_layout_hdr(lo
);
1623 dprintk("%s: inode %s/%llu pNFS layout segment %s for "
1624 "(%s, offset: %llu, length: %llu)\n",
1625 __func__
, ino
->i_sb
->s_id
,
1626 (unsigned long long)NFS_FILEID(ino
),
1627 IS_ERR_OR_NULL(lseg
) ? "not found" : "found",
1628 iomode
==IOMODE_RW
? "read/write" : "read-only",
1629 (unsigned long long)pos
,
1630 (unsigned long long)count
);
1633 spin_unlock(&ino
->i_lock
);
1634 goto out_put_layout_hdr
;
1636 EXPORT_SYMBOL_GPL(pnfs_update_layout
);
1639 pnfs_sanity_check_layout_range(struct pnfs_layout_range
*range
)
1641 switch (range
->iomode
) {
1648 if (range
->offset
== NFS4_MAX_UINT64
)
1650 if (range
->length
== 0)
1652 if (range
->length
!= NFS4_MAX_UINT64
&&
1653 range
->length
> NFS4_MAX_UINT64
- range
->offset
)
1658 struct pnfs_layout_segment
*
1659 pnfs_layout_process(struct nfs4_layoutget
*lgp
)
1661 struct pnfs_layout_hdr
*lo
= NFS_I(lgp
->args
.inode
)->layout
;
1662 struct nfs4_layoutget_res
*res
= &lgp
->res
;
1663 struct pnfs_layout_segment
*lseg
;
1664 struct inode
*ino
= lo
->plh_inode
;
1666 int status
= -EINVAL
;
1668 if (!pnfs_sanity_check_layout_range(&res
->range
))
1671 /* Inject layout blob into I/O device driver */
1672 lseg
= NFS_SERVER(ino
)->pnfs_curr_ld
->alloc_lseg(lo
, res
, lgp
->gfp_flags
);
1673 if (!lseg
|| IS_ERR(lseg
)) {
1677 status
= PTR_ERR(lseg
);
1678 dprintk("%s: Could not allocate layout: error %d\n",
1683 init_lseg(lo
, lseg
);
1684 lseg
->pls_range
= res
->range
;
1686 spin_lock(&ino
->i_lock
);
1687 if (pnfs_layoutgets_blocked(lo
)) {
1688 dprintk("%s forget reply due to state\n", __func__
);
1689 goto out_forget_reply
;
1692 if (nfs4_stateid_match_other(&lo
->plh_stateid
, &res
->stateid
)) {
1693 /* existing state ID, make sure the sequence number matches. */
1694 if (pnfs_layout_stateid_blocked(lo
, &res
->stateid
)) {
1695 dprintk("%s forget reply due to sequence\n", __func__
);
1697 goto out_forget_reply
;
1699 pnfs_set_layout_stateid(lo
, &res
->stateid
, false);
1702 * We got an entirely new state ID. Mark all segments for the
1703 * inode invalid, and don't bother validating the stateid
1706 pnfs_mark_matching_lsegs_invalid(lo
, &free_me
, NULL
);
1708 nfs4_stateid_copy(&lo
->plh_stateid
, &res
->stateid
);
1709 lo
->plh_barrier
= be32_to_cpu(res
->stateid
.seqid
);
1712 clear_bit(NFS_LAYOUT_INVALID_STID
, &lo
->plh_flags
);
1714 pnfs_get_lseg(lseg
);
1715 pnfs_layout_insert_lseg(lo
, lseg
, &free_me
);
1717 if (res
->return_on_close
)
1718 set_bit(NFS_LSEG_ROC
, &lseg
->pls_flags
);
1720 spin_unlock(&ino
->i_lock
);
1721 pnfs_free_lseg_list(&free_me
);
1724 return ERR_PTR(status
);
1727 spin_unlock(&ino
->i_lock
);
1728 lseg
->pls_layout
= lo
;
1729 NFS_SERVER(ino
)->pnfs_curr_ld
->free_lseg(lseg
);
1734 pnfs_set_plh_return_iomode(struct pnfs_layout_hdr
*lo
, enum pnfs_iomode iomode
)
1736 if (lo
->plh_return_iomode
== iomode
)
1738 if (lo
->plh_return_iomode
!= 0)
1739 iomode
= IOMODE_ANY
;
1740 lo
->plh_return_iomode
= iomode
;
1744 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr
*lo
,
1745 struct list_head
*tmp_list
,
1746 const struct pnfs_layout_range
*return_range
)
1748 struct pnfs_layout_segment
*lseg
, *next
;
1751 dprintk("%s:Begin lo %p\n", __func__
, lo
);
1753 if (list_empty(&lo
->plh_segs
))
1756 assert_spin_locked(&lo
->plh_inode
->i_lock
);
1758 list_for_each_entry_safe(lseg
, next
, &lo
->plh_segs
, pls_list
)
1759 if (should_free_lseg(&lseg
->pls_range
, return_range
)) {
1760 dprintk("%s: marking lseg %p iomode %d "
1761 "offset %llu length %llu\n", __func__
,
1762 lseg
, lseg
->pls_range
.iomode
,
1763 lseg
->pls_range
.offset
,
1764 lseg
->pls_range
.length
);
1765 set_bit(NFS_LSEG_LAYOUTRETURN
, &lseg
->pls_flags
);
1766 pnfs_set_plh_return_iomode(lo
, return_range
->iomode
);
1767 if (!mark_lseg_invalid(lseg
, tmp_list
))
1769 set_bit(NFS_LAYOUT_RETURN_REQUESTED
,
1775 void pnfs_error_mark_layout_for_return(struct inode
*inode
,
1776 struct pnfs_layout_segment
*lseg
)
1778 struct pnfs_layout_hdr
*lo
= NFS_I(inode
)->layout
;
1779 struct pnfs_layout_range range
= {
1780 .iomode
= lseg
->pls_range
.iomode
,
1782 .length
= NFS4_MAX_UINT64
,
1785 bool return_now
= false;
1787 spin_lock(&inode
->i_lock
);
1788 pnfs_set_plh_return_iomode(lo
, range
.iomode
);
1790 * mark all matching lsegs so that we are sure to have no live
1791 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
1794 if (!pnfs_mark_matching_lsegs_return(lo
, &free_me
, &range
)) {
1795 nfs4_stateid stateid
;
1796 enum pnfs_iomode iomode
= lo
->plh_return_iomode
;
1798 nfs4_stateid_copy(&stateid
, &lo
->plh_stateid
);
1799 return_now
= pnfs_prepare_layoutreturn(lo
);
1800 spin_unlock(&inode
->i_lock
);
1802 pnfs_send_layoutreturn(lo
, &stateid
, iomode
, false);
1804 spin_unlock(&inode
->i_lock
);
1805 nfs_commit_inode(inode
, 0);
1807 pnfs_free_lseg_list(&free_me
);
1809 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return
);
1812 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor
*pgio
, struct nfs_page
*req
)
1814 u64 rd_size
= req
->wb_bytes
;
1816 if (pgio
->pg_lseg
== NULL
) {
1817 if (pgio
->pg_dreq
== NULL
)
1818 rd_size
= i_size_read(pgio
->pg_inode
) - req_offset(req
);
1820 rd_size
= nfs_dreq_bytes_left(pgio
->pg_dreq
);
1822 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1828 if (IS_ERR(pgio
->pg_lseg
)) {
1829 pgio
->pg_error
= PTR_ERR(pgio
->pg_lseg
);
1830 pgio
->pg_lseg
= NULL
;
1834 /* If no lseg, fall back to read through mds */
1835 if (pgio
->pg_lseg
== NULL
)
1836 nfs_pageio_reset_read_mds(pgio
);
1839 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read
);
1842 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor
*pgio
,
1843 struct nfs_page
*req
, u64 wb_size
)
1845 if (pgio
->pg_lseg
== NULL
) {
1846 pgio
->pg_lseg
= pnfs_update_layout(pgio
->pg_inode
,
1852 if (IS_ERR(pgio
->pg_lseg
)) {
1853 pgio
->pg_error
= PTR_ERR(pgio
->pg_lseg
);
1854 pgio
->pg_lseg
= NULL
;
1858 /* If no lseg, fall back to write through mds */
1859 if (pgio
->pg_lseg
== NULL
)
1860 nfs_pageio_reset_write_mds(pgio
);
1862 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write
);
1865 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor
*desc
)
1867 if (desc
->pg_lseg
) {
1868 pnfs_put_lseg(desc
->pg_lseg
);
1869 desc
->pg_lseg
= NULL
;
1872 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup
);
1875 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
1876 * of bytes (maximum @req->wb_bytes) that can be coalesced.
1879 pnfs_generic_pg_test(struct nfs_pageio_descriptor
*pgio
,
1880 struct nfs_page
*prev
, struct nfs_page
*req
)
1883 u64 seg_end
, req_start
, seg_left
;
1885 size
= nfs_generic_pg_test(pgio
, prev
, req
);
1890 * 'size' contains the number of bytes left in the current page (up
1891 * to the original size asked for in @req->wb_bytes).
1893 * Calculate how many bytes are left in the layout segment
1894 * and if there are less bytes than 'size', return that instead.
1896 * Please also note that 'end_offset' is actually the offset of the
1897 * first byte that lies outside the pnfs_layout_range. FIXME?
1900 if (pgio
->pg_lseg
) {
1901 seg_end
= end_offset(pgio
->pg_lseg
->pls_range
.offset
,
1902 pgio
->pg_lseg
->pls_range
.length
);
1903 req_start
= req_offset(req
);
1904 WARN_ON_ONCE(req_start
>= seg_end
);
1905 /* start of request is past the last byte of this segment */
1906 if (req_start
>= seg_end
) {
1907 /* reference the new lseg */
1908 if (pgio
->pg_ops
->pg_cleanup
)
1909 pgio
->pg_ops
->pg_cleanup(pgio
);
1910 if (pgio
->pg_ops
->pg_init
)
1911 pgio
->pg_ops
->pg_init(pgio
, req
);
1915 /* adjust 'size' iff there are fewer bytes left in the
1916 * segment than what nfs_generic_pg_test returned */
1917 seg_left
= seg_end
- req_start
;
1918 if (seg_left
< size
)
1919 size
= (unsigned int)seg_left
;
1924 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test
);
1926 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
1928 struct nfs_pageio_descriptor pgio
;
1930 /* Resend all requests through the MDS */
1931 nfs_pageio_init_write(&pgio
, hdr
->inode
, FLUSH_STABLE
, true,
1932 hdr
->completion_ops
);
1933 set_bit(NFS_CONTEXT_RESEND_WRITES
, &hdr
->args
.context
->flags
);
1934 return nfs_pageio_resend(&pgio
, hdr
);
1936 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds
);
1938 static void pnfs_ld_handle_write_error(struct nfs_pgio_header
*hdr
)
1941 dprintk("pnfs write error = %d\n", hdr
->pnfs_error
);
1942 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
1943 PNFS_LAYOUTRET_ON_ERROR
) {
1944 pnfs_return_layout(hdr
->inode
);
1946 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
1947 hdr
->task
.tk_status
= pnfs_write_done_resend_to_mds(hdr
);
1951 * Called by non rpc-based layout drivers
1953 void pnfs_ld_write_done(struct nfs_pgio_header
*hdr
)
1955 if (likely(!hdr
->pnfs_error
)) {
1956 pnfs_set_layoutcommit(hdr
->inode
, hdr
->lseg
,
1957 hdr
->mds_offset
+ hdr
->res
.count
);
1958 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
1960 trace_nfs4_pnfs_write(hdr
, hdr
->pnfs_error
);
1961 if (unlikely(hdr
->pnfs_error
))
1962 pnfs_ld_handle_write_error(hdr
);
1963 hdr
->mds_ops
->rpc_release(hdr
);
1965 EXPORT_SYMBOL_GPL(pnfs_ld_write_done
);
1968 pnfs_write_through_mds(struct nfs_pageio_descriptor
*desc
,
1969 struct nfs_pgio_header
*hdr
)
1971 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
1973 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
1974 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
1975 nfs_pageio_reset_write_mds(desc
);
1976 mirror
->pg_recoalesce
= 1;
1978 nfs_pgio_data_destroy(hdr
);
1982 static enum pnfs_try_status
1983 pnfs_try_to_write_data(struct nfs_pgio_header
*hdr
,
1984 const struct rpc_call_ops
*call_ops
,
1985 struct pnfs_layout_segment
*lseg
,
1988 struct inode
*inode
= hdr
->inode
;
1989 enum pnfs_try_status trypnfs
;
1990 struct nfs_server
*nfss
= NFS_SERVER(inode
);
1992 hdr
->mds_ops
= call_ops
;
1994 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__
,
1995 inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
, how
);
1996 trypnfs
= nfss
->pnfs_curr_ld
->write_pagelist(hdr
, how
);
1997 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
1998 nfs_inc_stats(inode
, NFSIOS_PNFS_WRITE
);
1999 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2004 pnfs_do_write(struct nfs_pageio_descriptor
*desc
,
2005 struct nfs_pgio_header
*hdr
, int how
)
2007 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2008 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2009 enum pnfs_try_status trypnfs
;
2011 trypnfs
= pnfs_try_to_write_data(hdr
, call_ops
, lseg
, how
);
2012 if (trypnfs
== PNFS_NOT_ATTEMPTED
)
2013 pnfs_write_through_mds(desc
, hdr
);
2016 static void pnfs_writehdr_free(struct nfs_pgio_header
*hdr
)
2018 pnfs_put_lseg(hdr
->lseg
);
2019 nfs_pgio_header_free(hdr
);
2023 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor
*desc
)
2025 struct nfs_pgio_header
*hdr
;
2028 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2030 desc
->pg_error
= -ENOMEM
;
2031 return desc
->pg_error
;
2033 nfs_pgheader_init(desc
, hdr
, pnfs_writehdr_free
);
2035 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2036 ret
= nfs_generic_pgio(desc
, hdr
);
2038 pnfs_do_write(desc
, hdr
, desc
->pg_ioflags
);
2042 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages
);
2044 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header
*hdr
)
2046 struct nfs_pageio_descriptor pgio
;
2048 /* Resend all requests through the MDS */
2049 nfs_pageio_init_read(&pgio
, hdr
->inode
, true, hdr
->completion_ops
);
2050 return nfs_pageio_resend(&pgio
, hdr
);
2052 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds
);
2054 static void pnfs_ld_handle_read_error(struct nfs_pgio_header
*hdr
)
2056 dprintk("pnfs read error = %d\n", hdr
->pnfs_error
);
2057 if (NFS_SERVER(hdr
->inode
)->pnfs_curr_ld
->flags
&
2058 PNFS_LAYOUTRET_ON_ERROR
) {
2059 pnfs_return_layout(hdr
->inode
);
2061 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
))
2062 hdr
->task
.tk_status
= pnfs_read_done_resend_to_mds(hdr
);
2066 * Called by non rpc-based layout drivers
2068 void pnfs_ld_read_done(struct nfs_pgio_header
*hdr
)
2070 if (likely(!hdr
->pnfs_error
)) {
2071 __nfs4_read_done_cb(hdr
);
2072 hdr
->mds_ops
->rpc_call_done(&hdr
->task
, hdr
);
2074 trace_nfs4_pnfs_read(hdr
, hdr
->pnfs_error
);
2075 if (unlikely(hdr
->pnfs_error
))
2076 pnfs_ld_handle_read_error(hdr
);
2077 hdr
->mds_ops
->rpc_release(hdr
);
2079 EXPORT_SYMBOL_GPL(pnfs_ld_read_done
);
2082 pnfs_read_through_mds(struct nfs_pageio_descriptor
*desc
,
2083 struct nfs_pgio_header
*hdr
)
2085 struct nfs_pgio_mirror
*mirror
= nfs_pgio_current_mirror(desc
);
2087 if (!test_and_set_bit(NFS_IOHDR_REDO
, &hdr
->flags
)) {
2088 list_splice_tail_init(&hdr
->pages
, &mirror
->pg_list
);
2089 nfs_pageio_reset_read_mds(desc
);
2090 mirror
->pg_recoalesce
= 1;
2092 nfs_pgio_data_destroy(hdr
);
2097 * Call the appropriate parallel I/O subsystem read function.
2099 static enum pnfs_try_status
2100 pnfs_try_to_read_data(struct nfs_pgio_header
*hdr
,
2101 const struct rpc_call_ops
*call_ops
,
2102 struct pnfs_layout_segment
*lseg
)
2104 struct inode
*inode
= hdr
->inode
;
2105 struct nfs_server
*nfss
= NFS_SERVER(inode
);
2106 enum pnfs_try_status trypnfs
;
2108 hdr
->mds_ops
= call_ops
;
2110 dprintk("%s: Reading ino:%lu %u@%llu\n",
2111 __func__
, inode
->i_ino
, hdr
->args
.count
, hdr
->args
.offset
);
2113 trypnfs
= nfss
->pnfs_curr_ld
->read_pagelist(hdr
);
2114 if (trypnfs
!= PNFS_NOT_ATTEMPTED
)
2115 nfs_inc_stats(inode
, NFSIOS_PNFS_READ
);
2116 dprintk("%s End (trypnfs:%d)\n", __func__
, trypnfs
);
2120 /* Resend all requests through pnfs. */
2121 int pnfs_read_resend_pnfs(struct nfs_pgio_header
*hdr
)
2123 struct nfs_pageio_descriptor pgio
;
2125 nfs_pageio_init_read(&pgio
, hdr
->inode
, false, hdr
->completion_ops
);
2126 return nfs_pageio_resend(&pgio
, hdr
);
2128 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs
);
2131 pnfs_do_read(struct nfs_pageio_descriptor
*desc
, struct nfs_pgio_header
*hdr
)
2133 const struct rpc_call_ops
*call_ops
= desc
->pg_rpc_callops
;
2134 struct pnfs_layout_segment
*lseg
= desc
->pg_lseg
;
2135 enum pnfs_try_status trypnfs
;
2138 trypnfs
= pnfs_try_to_read_data(hdr
, call_ops
, lseg
);
2139 if (trypnfs
== PNFS_TRY_AGAIN
)
2140 err
= pnfs_read_resend_pnfs(hdr
);
2141 if (trypnfs
== PNFS_NOT_ATTEMPTED
|| err
)
2142 pnfs_read_through_mds(desc
, hdr
);
2145 static void pnfs_readhdr_free(struct nfs_pgio_header
*hdr
)
2147 pnfs_put_lseg(hdr
->lseg
);
2148 nfs_pgio_header_free(hdr
);
2152 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor
*desc
)
2154 struct nfs_pgio_header
*hdr
;
2157 hdr
= nfs_pgio_header_alloc(desc
->pg_rw_ops
);
2159 desc
->pg_error
= -ENOMEM
;
2160 return desc
->pg_error
;
2162 nfs_pgheader_init(desc
, hdr
, pnfs_readhdr_free
);
2163 hdr
->lseg
= pnfs_get_lseg(desc
->pg_lseg
);
2164 ret
= nfs_generic_pgio(desc
, hdr
);
2166 pnfs_do_read(desc
, hdr
);
2169 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages
);
2171 static void pnfs_clear_layoutcommitting(struct inode
*inode
)
2173 unsigned long *bitlock
= &NFS_I(inode
)->flags
;
2175 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING
, bitlock
);
2176 smp_mb__after_atomic();
2177 wake_up_bit(bitlock
, NFS_INO_LAYOUTCOMMITTING
);
2181 * There can be multiple RW segments.
2183 static void pnfs_list_write_lseg(struct inode
*inode
, struct list_head
*listp
)
2185 struct pnfs_layout_segment
*lseg
;
2187 list_for_each_entry(lseg
, &NFS_I(inode
)->layout
->plh_segs
, pls_list
) {
2188 if (lseg
->pls_range
.iomode
== IOMODE_RW
&&
2189 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
))
2190 list_add(&lseg
->pls_lc_list
, listp
);
2194 static void pnfs_list_write_lseg_done(struct inode
*inode
, struct list_head
*listp
)
2196 struct pnfs_layout_segment
*lseg
, *tmp
;
2198 /* Matched by references in pnfs_set_layoutcommit */
2199 list_for_each_entry_safe(lseg
, tmp
, listp
, pls_lc_list
) {
2200 list_del_init(&lseg
->pls_lc_list
);
2201 pnfs_put_lseg(lseg
);
2204 pnfs_clear_layoutcommitting(inode
);
2207 void pnfs_set_lo_fail(struct pnfs_layout_segment
*lseg
)
2209 pnfs_layout_io_set_failed(lseg
->pls_layout
, lseg
->pls_range
.iomode
);
2211 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail
);
2214 pnfs_set_layoutcommit(struct inode
*inode
, struct pnfs_layout_segment
*lseg
,
2217 struct nfs_inode
*nfsi
= NFS_I(inode
);
2218 bool mark_as_dirty
= false;
2220 spin_lock(&inode
->i_lock
);
2221 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
)) {
2222 nfsi
->layout
->plh_lwb
= end_pos
;
2223 mark_as_dirty
= true;
2224 dprintk("%s: Set layoutcommit for inode %lu ",
2225 __func__
, inode
->i_ino
);
2226 } else if (end_pos
> nfsi
->layout
->plh_lwb
)
2227 nfsi
->layout
->plh_lwb
= end_pos
;
2228 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT
, &lseg
->pls_flags
)) {
2229 /* references matched in nfs4_layoutcommit_release */
2230 pnfs_get_lseg(lseg
);
2232 spin_unlock(&inode
->i_lock
);
2233 dprintk("%s: lseg %p end_pos %llu\n",
2234 __func__
, lseg
, nfsi
->layout
->plh_lwb
);
2236 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one
2237 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */
2239 mark_inode_dirty_sync(inode
);
2241 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit
);
2243 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data
*data
)
2245 struct nfs_server
*nfss
= NFS_SERVER(data
->args
.inode
);
2247 if (nfss
->pnfs_curr_ld
->cleanup_layoutcommit
)
2248 nfss
->pnfs_curr_ld
->cleanup_layoutcommit(data
);
2249 pnfs_list_write_lseg_done(data
->args
.inode
, &data
->lseg_list
);
2253 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and
2254 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough
2255 * data to disk to allow the server to recover the data if it crashes.
2256 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag
2257 * is off, and a COMMIT is sent to a data server, or
2258 * if WRITEs to a data server return NFS_DATA_SYNC.
2261 pnfs_layoutcommit_inode(struct inode
*inode
, bool sync
)
2263 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2264 struct nfs4_layoutcommit_data
*data
;
2265 struct nfs_inode
*nfsi
= NFS_I(inode
);
2269 if (!pnfs_layoutcommit_outstanding(inode
))
2272 dprintk("--> %s inode %lu\n", __func__
, inode
->i_ino
);
2275 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING
, &nfsi
->flags
)) {
2278 status
= wait_on_bit_lock_action(&nfsi
->flags
,
2279 NFS_INO_LAYOUTCOMMITTING
,
2280 nfs_wait_bit_killable
,
2287 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
2288 data
= kzalloc(sizeof(*data
), GFP_NOFS
);
2290 goto clear_layoutcommitting
;
2293 spin_lock(&inode
->i_lock
);
2294 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
))
2297 INIT_LIST_HEAD(&data
->lseg_list
);
2298 pnfs_list_write_lseg(inode
, &data
->lseg_list
);
2300 end_pos
= nfsi
->layout
->plh_lwb
;
2302 nfs4_stateid_copy(&data
->args
.stateid
, &nfsi
->layout
->plh_stateid
);
2303 spin_unlock(&inode
->i_lock
);
2305 data
->args
.inode
= inode
;
2306 data
->cred
= get_rpccred(nfsi
->layout
->plh_lc_cred
);
2307 nfs_fattr_init(&data
->fattr
);
2308 data
->args
.bitmask
= NFS_SERVER(inode
)->cache_consistency_bitmask
;
2309 data
->res
.fattr
= &data
->fattr
;
2310 data
->args
.lastbytewritten
= end_pos
- 1;
2311 data
->res
.server
= NFS_SERVER(inode
);
2313 if (ld
->prepare_layoutcommit
) {
2314 status
= ld
->prepare_layoutcommit(&data
->args
);
2316 put_rpccred(data
->cred
);
2317 spin_lock(&inode
->i_lock
);
2318 set_bit(NFS_INO_LAYOUTCOMMIT
, &nfsi
->flags
);
2319 if (end_pos
> nfsi
->layout
->plh_lwb
)
2320 nfsi
->layout
->plh_lwb
= end_pos
;
2326 status
= nfs4_proc_layoutcommit(data
, sync
);
2329 mark_inode_dirty_sync(inode
);
2330 dprintk("<-- %s status %d\n", __func__
, status
);
2333 spin_unlock(&inode
->i_lock
);
2335 clear_layoutcommitting
:
2336 pnfs_clear_layoutcommitting(inode
);
2339 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode
);
2342 pnfs_generic_sync(struct inode
*inode
, bool datasync
)
2344 return pnfs_layoutcommit_inode(inode
, true);
2346 EXPORT_SYMBOL_GPL(pnfs_generic_sync
);
2348 struct nfs4_threshold
*pnfs_mdsthreshold_alloc(void)
2350 struct nfs4_threshold
*thp
;
2352 thp
= kzalloc(sizeof(*thp
), GFP_NOFS
);
2354 dprintk("%s mdsthreshold allocation failed\n", __func__
);
2360 #if IS_ENABLED(CONFIG_NFS_V4_2)
2362 pnfs_report_layoutstat(struct inode
*inode
, gfp_t gfp_flags
)
2364 struct pnfs_layoutdriver_type
*ld
= NFS_SERVER(inode
)->pnfs_curr_ld
;
2365 struct nfs_server
*server
= NFS_SERVER(inode
);
2366 struct nfs_inode
*nfsi
= NFS_I(inode
);
2367 struct nfs42_layoutstat_data
*data
;
2368 struct pnfs_layout_hdr
*hdr
;
2371 if (!pnfs_enabled_sb(server
) || !ld
->prepare_layoutstats
)
2374 if (!nfs_server_capable(inode
, NFS_CAP_LAYOUTSTATS
))
2377 if (test_and_set_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
))
2380 spin_lock(&inode
->i_lock
);
2381 if (!NFS_I(inode
)->layout
) {
2382 spin_unlock(&inode
->i_lock
);
2385 hdr
= NFS_I(inode
)->layout
;
2386 pnfs_get_layout_hdr(hdr
);
2387 spin_unlock(&inode
->i_lock
);
2389 data
= kzalloc(sizeof(*data
), gfp_flags
);
2395 data
->args
.fh
= NFS_FH(inode
);
2396 data
->args
.inode
= inode
;
2397 nfs4_stateid_copy(&data
->args
.stateid
, &hdr
->plh_stateid
);
2398 status
= ld
->prepare_layoutstats(&data
->args
);
2402 status
= nfs42_proc_layoutstats_generic(NFS_SERVER(inode
), data
);
2405 dprintk("%s returns %d\n", __func__
, status
);
2411 pnfs_put_layout_hdr(hdr
);
2412 smp_mb__before_atomic();
2413 clear_bit(NFS_INO_LAYOUTSTATS
, &nfsi
->flags
);
2414 smp_mb__after_atomic();
2417 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat
);
2420 unsigned int layoutstats_timer
;
2421 module_param(layoutstats_timer
, uint
, 0644);
2422 EXPORT_SYMBOL_GPL(layoutstats_timer
);