1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/module.h>
5 #include <linux/sched.h>
6 #include <linux/slab.h>
7 #include <linux/file.h>
8 #include <linux/mount.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/falloc.h>
14 #include "mds_client.h"
17 static __le32
ceph_flags_sys2wire(u32 flags
)
21 switch (flags
& O_ACCMODE
) {
23 wire_flags
|= CEPH_O_RDONLY
;
26 wire_flags
|= CEPH_O_WRONLY
;
29 wire_flags
|= CEPH_O_RDWR
;
33 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
35 ceph_sys2wire(O_CREAT
);
36 ceph_sys2wire(O_EXCL
);
37 ceph_sys2wire(O_TRUNC
);
38 ceph_sys2wire(O_DIRECTORY
);
39 ceph_sys2wire(O_NOFOLLOW
);
44 dout("unused open flags: %x", flags
);
46 return cpu_to_le32(wire_flags
);
50 * Ceph file operations
52 * Implement basic open/close functionality, and implement
55 * We implement three modes of file I/O:
56 * - buffered uses the generic_file_aio_{read,write} helpers
58 * - synchronous is used when there is multi-client read/write
59 * sharing, avoids the page cache, and synchronously waits for an
62 * - direct io takes the variant of the sync path that references
63 * user pages directly.
65 * fsync() flushes and waits on dirty pages, but just queues metadata
66 * for writeback: since the MDS can recover size and mtime there is no
67 * need to wait for MDS acknowledgement.
71 * Calculate the length sum of direct io vectors that can
72 * be combined into one page vector.
74 static size_t dio_get_pagev_size(const struct iov_iter
*it
)
76 const struct iovec
*iov
= it
->iov
;
77 const struct iovec
*iovend
= iov
+ it
->nr_segs
;
80 size
= iov
->iov_len
- it
->iov_offset
;
82 * An iov can be page vectored when both the current tail
83 * and the next base are page aligned.
85 while (PAGE_ALIGNED((iov
->iov_base
+ iov
->iov_len
)) &&
86 (++iov
< iovend
&& PAGE_ALIGNED((iov
->iov_base
)))) {
89 dout("dio_get_pagevlen len = %zu\n", size
);
94 * Allocate a page vector based on (@it, @nbytes).
95 * The return value is the tuple describing a page vector,
96 * that is (@pages, @page_align, @num_pages).
99 dio_get_pages_alloc(const struct iov_iter
*it
, size_t nbytes
,
100 size_t *page_align
, int *num_pages
)
102 struct iov_iter tmp_it
= *it
;
105 int ret
= 0, idx
, npages
;
107 align
= (unsigned long)(it
->iov
->iov_base
+ it
->iov_offset
) &
109 npages
= calc_pages_for(align
, nbytes
);
110 pages
= kvmalloc(sizeof(*pages
) * npages
, GFP_KERNEL
);
112 return ERR_PTR(-ENOMEM
);
114 for (idx
= 0; idx
< npages
; ) {
116 ret
= iov_iter_get_pages(&tmp_it
, pages
+ idx
, nbytes
,
117 npages
- idx
, &start
);
121 iov_iter_advance(&tmp_it
, ret
);
123 idx
+= (ret
+ start
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
129 dout("dio_get_pages_alloc: got %d pages align %zu\n", npages
, align
);
132 ceph_put_page_vector(pages
, idx
, false);
137 * Prepare an open request. Preallocate ceph_cap to avoid an
138 * inopportune ENOMEM later.
140 static struct ceph_mds_request
*
141 prepare_open_request(struct super_block
*sb
, int flags
, int create_mode
)
143 struct ceph_fs_client
*fsc
= ceph_sb_to_client(sb
);
144 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
145 struct ceph_mds_request
*req
;
146 int want_auth
= USE_ANY_MDS
;
147 int op
= (flags
& O_CREAT
) ? CEPH_MDS_OP_CREATE
: CEPH_MDS_OP_OPEN
;
149 if (flags
& (O_WRONLY
|O_RDWR
|O_CREAT
|O_TRUNC
))
150 want_auth
= USE_AUTH_MDS
;
152 req
= ceph_mdsc_create_request(mdsc
, op
, want_auth
);
155 req
->r_fmode
= ceph_flags_to_mode(flags
);
156 req
->r_args
.open
.flags
= ceph_flags_sys2wire(flags
);
157 req
->r_args
.open
.mode
= cpu_to_le32(create_mode
);
163 * initialize private struct file data.
164 * if we fail, clean up by dropping fmode reference on the ceph_inode
166 static int ceph_init_file(struct inode
*inode
, struct file
*file
, int fmode
)
168 struct ceph_file_info
*cf
;
171 switch (inode
->i_mode
& S_IFMT
) {
173 ceph_fscache_register_inode_cookie(inode
);
174 ceph_fscache_file_set_cookie(inode
, file
);
176 dout("init_file %p %p 0%o (regular)\n", inode
, file
,
178 cf
= kmem_cache_zalloc(ceph_file_cachep
, GFP_KERNEL
);
180 ceph_put_fmode(ceph_inode(inode
), fmode
); /* clean up */
185 spin_lock_init(&cf
->rw_contexts_lock
);
186 INIT_LIST_HEAD(&cf
->rw_contexts
);
189 cf
->readdir_cache_idx
= -1;
190 file
->private_data
= cf
;
191 BUG_ON(inode
->i_fop
->release
!= ceph_release
);
195 dout("init_file %p %p 0%o (symlink)\n", inode
, file
,
197 ceph_put_fmode(ceph_inode(inode
), fmode
); /* clean up */
201 dout("init_file %p %p 0%o (special)\n", inode
, file
,
204 * we need to drop the open ref now, since we don't
205 * have .release set to ceph_release.
207 ceph_put_fmode(ceph_inode(inode
), fmode
); /* clean up */
208 BUG_ON(inode
->i_fop
->release
== ceph_release
);
210 /* call the proper open fop */
211 ret
= inode
->i_fop
->open(inode
, file
);
217 * try renew caps after session gets killed.
219 int ceph_renew_caps(struct inode
*inode
)
221 struct ceph_mds_client
*mdsc
= ceph_sb_to_client(inode
->i_sb
)->mdsc
;
222 struct ceph_inode_info
*ci
= ceph_inode(inode
);
223 struct ceph_mds_request
*req
;
224 int err
, flags
, wanted
;
226 spin_lock(&ci
->i_ceph_lock
);
227 wanted
= __ceph_caps_file_wanted(ci
);
228 if (__ceph_is_any_real_caps(ci
) &&
229 (!(wanted
& CEPH_CAP_ANY_WR
) || ci
->i_auth_cap
)) {
230 int issued
= __ceph_caps_issued(ci
, NULL
);
231 spin_unlock(&ci
->i_ceph_lock
);
232 dout("renew caps %p want %s issued %s updating mds_wanted\n",
233 inode
, ceph_cap_string(wanted
), ceph_cap_string(issued
));
234 ceph_check_caps(ci
, 0, NULL
);
237 spin_unlock(&ci
->i_ceph_lock
);
240 if ((wanted
& CEPH_CAP_FILE_RD
) && (wanted
& CEPH_CAP_FILE_WR
))
242 else if (wanted
& CEPH_CAP_FILE_RD
)
244 else if (wanted
& CEPH_CAP_FILE_WR
)
247 if (wanted
& CEPH_CAP_FILE_LAZYIO
)
251 req
= prepare_open_request(inode
->i_sb
, flags
, 0);
257 req
->r_inode
= inode
;
262 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
263 ceph_mdsc_put_request(req
);
265 dout("renew caps %p open result=%d\n", inode
, err
);
266 return err
< 0 ? err
: 0;
270 * If we already have the requisite capabilities, we can satisfy
271 * the open request locally (no need to request new caps from the
272 * MDS). We do, however, need to inform the MDS (asynchronously)
273 * if our wanted caps set expands.
275 int ceph_open(struct inode
*inode
, struct file
*file
)
277 struct ceph_inode_info
*ci
= ceph_inode(inode
);
278 struct ceph_fs_client
*fsc
= ceph_sb_to_client(inode
->i_sb
);
279 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
280 struct ceph_mds_request
*req
;
281 struct ceph_file_info
*cf
= file
->private_data
;
283 int flags
, fmode
, wanted
;
286 dout("open file %p is already opened\n", file
);
290 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
291 flags
= file
->f_flags
& ~(O_CREAT
|O_EXCL
);
292 if (S_ISDIR(inode
->i_mode
))
293 flags
= O_DIRECTORY
; /* mds likes to know */
295 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode
,
296 ceph_vinop(inode
), file
, flags
, file
->f_flags
);
297 fmode
= ceph_flags_to_mode(flags
);
298 wanted
= ceph_caps_for_mode(fmode
);
300 /* snapped files are read-only */
301 if (ceph_snap(inode
) != CEPH_NOSNAP
&& (file
->f_mode
& FMODE_WRITE
))
304 /* trivially open snapdir */
305 if (ceph_snap(inode
) == CEPH_SNAPDIR
) {
306 spin_lock(&ci
->i_ceph_lock
);
307 __ceph_get_fmode(ci
, fmode
);
308 spin_unlock(&ci
->i_ceph_lock
);
309 return ceph_init_file(inode
, file
, fmode
);
313 * No need to block if we have caps on the auth MDS (for
314 * write) or any MDS (for read). Update wanted set
317 spin_lock(&ci
->i_ceph_lock
);
318 if (__ceph_is_any_real_caps(ci
) &&
319 (((fmode
& CEPH_FILE_MODE_WR
) == 0) || ci
->i_auth_cap
)) {
320 int mds_wanted
= __ceph_caps_mds_wanted(ci
, true);
321 int issued
= __ceph_caps_issued(ci
, NULL
);
323 dout("open %p fmode %d want %s issued %s using existing\n",
324 inode
, fmode
, ceph_cap_string(wanted
),
325 ceph_cap_string(issued
));
326 __ceph_get_fmode(ci
, fmode
);
327 spin_unlock(&ci
->i_ceph_lock
);
330 if ((issued
& wanted
) != wanted
&&
331 (mds_wanted
& wanted
) != wanted
&&
332 ceph_snap(inode
) != CEPH_SNAPDIR
)
333 ceph_check_caps(ci
, 0, NULL
);
335 return ceph_init_file(inode
, file
, fmode
);
336 } else if (ceph_snap(inode
) != CEPH_NOSNAP
&&
337 (ci
->i_snap_caps
& wanted
) == wanted
) {
338 __ceph_get_fmode(ci
, fmode
);
339 spin_unlock(&ci
->i_ceph_lock
);
340 return ceph_init_file(inode
, file
, fmode
);
343 spin_unlock(&ci
->i_ceph_lock
);
345 dout("open fmode %d wants %s\n", fmode
, ceph_cap_string(wanted
));
346 req
= prepare_open_request(inode
->i_sb
, flags
, 0);
351 req
->r_inode
= inode
;
355 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
357 err
= ceph_init_file(inode
, file
, req
->r_fmode
);
358 ceph_mdsc_put_request(req
);
359 dout("open result=%d on %llx.%llx\n", err
, ceph_vinop(inode
));
366 * Do a lookup + open with a single request. If we get a non-existent
367 * file or symlink, return 1 so the VFS can retry.
369 int ceph_atomic_open(struct inode
*dir
, struct dentry
*dentry
,
370 struct file
*file
, unsigned flags
, umode_t mode
,
373 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
374 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
375 struct ceph_mds_request
*req
;
377 struct ceph_acls_info acls
= {};
381 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
383 d_unhashed(dentry
) ? "unhashed" : "hashed", flags
, mode
);
385 if (dentry
->d_name
.len
> NAME_MAX
)
386 return -ENAMETOOLONG
;
388 if (flags
& O_CREAT
) {
389 if (ceph_quota_is_max_files_exceeded(dir
))
391 err
= ceph_pre_init_acls(dir
, &mode
, &acls
);
397 req
= prepare_open_request(dir
->i_sb
, flags
, mode
);
402 req
->r_dentry
= dget(dentry
);
404 if (flags
& O_CREAT
) {
405 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
406 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
408 req
->r_pagelist
= acls
.pagelist
;
409 acls
.pagelist
= NULL
;
413 mask
= CEPH_STAT_CAP_INODE
| CEPH_CAP_AUTH_SHARED
;
414 if (ceph_security_xattr_wanted(dir
))
415 mask
|= CEPH_CAP_XATTR_SHARED
;
416 req
->r_args
.open
.mask
= cpu_to_le32(mask
);
419 set_bit(CEPH_MDS_R_PARENT_LOCKED
, &req
->r_req_flags
);
420 err
= ceph_mdsc_do_request(mdsc
,
421 (flags
& (O_CREAT
|O_TRUNC
)) ? dir
: NULL
,
423 err
= ceph_handle_snapdir(req
, dentry
, err
);
427 if ((flags
& O_CREAT
) && !req
->r_reply_info
.head
->is_dentry
)
428 err
= ceph_handle_notrace_create(dir
, dentry
);
430 if (d_in_lookup(dentry
)) {
431 dn
= ceph_finish_lookup(req
, dentry
, err
);
435 /* we were given a hashed negative dentry */
440 if (dn
|| d_really_is_negative(dentry
) || d_is_symlink(dentry
)) {
441 /* make vfs retry on splice, ENOENT, or symlink */
442 dout("atomic_open finish_no_open on dn %p\n", dn
);
443 err
= finish_no_open(file
, dn
);
445 dout("atomic_open finish_open on dn %p\n", dn
);
446 if (req
->r_op
== CEPH_MDS_OP_CREATE
&& req
->r_reply_info
.has_create_ino
) {
447 ceph_init_inode_acls(d_inode(dentry
), &acls
);
448 *opened
|= FILE_CREATED
;
450 err
= finish_open(file
, dentry
, ceph_open
, opened
);
453 if (!req
->r_err
&& req
->r_target_inode
)
454 ceph_put_fmode(ceph_inode(req
->r_target_inode
), req
->r_fmode
);
455 ceph_mdsc_put_request(req
);
457 ceph_release_acls_info(&acls
);
458 dout("atomic_open result=%d\n", err
);
462 int ceph_release(struct inode
*inode
, struct file
*file
)
464 struct ceph_inode_info
*ci
= ceph_inode(inode
);
465 struct ceph_file_info
*cf
= file
->private_data
;
467 dout("release inode %p file %p\n", inode
, file
);
468 ceph_put_fmode(ci
, cf
->fmode
);
469 if (cf
->last_readdir
)
470 ceph_mdsc_put_request(cf
->last_readdir
);
471 kfree(cf
->last_name
);
473 WARN_ON(!list_empty(&cf
->rw_contexts
));
474 kmem_cache_free(ceph_file_cachep
, cf
);
476 /* wake up anyone waiting for caps on this inode */
477 wake_up_all(&ci
->i_cap_wq
);
488 * Read a range of bytes striped over one or more objects. Iterate over
489 * objects we stripe over. (That's not atomic, but good enough for now.)
491 * If we get a short result from the OSD, check against i_size; we need to
492 * only return a short read to the caller if we hit EOF.
494 static int striped_read(struct inode
*inode
,
496 struct page
**pages
, int num_pages
,
497 int page_align
, int *checkeof
)
499 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
500 struct ceph_inode_info
*ci
= ceph_inode(inode
);
505 bool hit_stripe
, was_short
;
508 * we may need to do multiple reads. not atomic, unfortunately.
512 page_idx
= (page_align
+ read
) >> PAGE_SHIFT
;
513 ret
= ceph_osdc_readpages(&fsc
->client
->osdc
, ceph_vino(inode
),
514 &ci
->i_layout
, pos
, &this_len
,
515 ci
->i_truncate_seq
, ci
->i_truncate_size
,
516 pages
+ page_idx
, num_pages
- page_idx
,
517 ((page_align
+ read
) & ~PAGE_MASK
));
520 hit_stripe
= this_len
< len
;
521 was_short
= ret
>= 0 && ret
< this_len
;
522 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos
, len
, read
,
523 ret
, hit_stripe
? " HITSTRIPE" : "", was_short
? " SHORT" : "");
525 i_size
= i_size_read(inode
);
527 if (was_short
&& (pos
+ ret
< i_size
)) {
528 int zlen
= min(this_len
- ret
, i_size
- pos
- ret
);
529 int zoff
= page_align
+ read
+ ret
;
530 dout(" zero gap %llu to %llu\n",
531 pos
+ ret
, pos
+ ret
+ zlen
);
532 ceph_zero_page_vector_range(zoff
, zlen
, pages
);
540 /* hit stripe and need continue*/
541 if (len
&& hit_stripe
&& pos
< i_size
)
547 /* did we bounce off eof? */
548 if (pos
+ len
> i_size
)
549 *checkeof
= CHECK_EOF
;
552 dout("striped_read returns %d\n", ret
);
557 * Completely synchronous read and write methods. Direct from __user
558 * buffer to osd, or directly to user pages (if O_DIRECT).
560 * If the read spans object boundary, just do multiple reads.
562 static ssize_t
ceph_sync_read(struct kiocb
*iocb
, struct iov_iter
*to
,
565 struct file
*file
= iocb
->ki_filp
;
566 struct inode
*inode
= file_inode(file
);
568 u64 off
= iocb
->ki_pos
;
571 size_t len
= iov_iter_count(to
);
573 dout("sync_read on file %p %llu~%u %s\n", file
, off
, (unsigned)len
,
574 (file
->f_flags
& O_DIRECT
) ? "O_DIRECT" : "");
579 * flush any page cache pages in this range. this
580 * will make concurrent normal and sync io slow,
581 * but it will at least behave sensibly when they are
584 ret
= filemap_write_and_wait_range(inode
->i_mapping
, off
,
589 if (unlikely(to
->type
& ITER_PIPE
)) {
591 ret
= iov_iter_get_pages_alloc(to
, &pages
, len
,
595 num_pages
= DIV_ROUND_UP(ret
+ page_off
, PAGE_SIZE
);
597 ret
= striped_read(inode
, off
, ret
, pages
, num_pages
,
600 iov_iter_advance(to
, ret
);
603 iov_iter_advance(to
, 0);
605 ceph_put_page_vector(pages
, num_pages
, false);
607 num_pages
= calc_pages_for(off
, len
);
608 pages
= ceph_alloc_page_vector(num_pages
, GFP_KERNEL
);
610 return PTR_ERR(pages
);
612 ret
= striped_read(inode
, off
, len
, pages
, num_pages
,
613 (off
& ~PAGE_MASK
), checkeof
);
619 size_t page_off
= off
& ~PAGE_MASK
;
620 size_t copy
= min_t(size_t, left
,
621 PAGE_SIZE
- page_off
);
622 l
= copy_page_to_iter(pages
[k
++], page_off
,
630 ceph_release_page_vector(pages
, num_pages
);
633 if (off
> iocb
->ki_pos
) {
634 ret
= off
- iocb
->ki_pos
;
638 dout("sync_read result %zd\n", ret
);
642 struct ceph_aio_request
{
648 struct list_head osd_reqs
;
650 atomic_t pending_reqs
;
651 struct timespec mtime
;
652 struct ceph_cap_flush
*prealloc_cf
;
655 struct ceph_aio_work
{
656 struct work_struct work
;
657 struct ceph_osd_request
*req
;
660 static void ceph_aio_retry_work(struct work_struct
*work
);
662 static void ceph_aio_complete(struct inode
*inode
,
663 struct ceph_aio_request
*aio_req
)
665 struct ceph_inode_info
*ci
= ceph_inode(inode
);
668 if (!atomic_dec_and_test(&aio_req
->pending_reqs
))
671 ret
= aio_req
->error
;
673 ret
= aio_req
->total_len
;
675 dout("ceph_aio_complete %p rc %d\n", inode
, ret
);
677 if (ret
>= 0 && aio_req
->write
) {
680 loff_t endoff
= aio_req
->iocb
->ki_pos
+ aio_req
->total_len
;
681 if (endoff
> i_size_read(inode
)) {
682 if (ceph_inode_set_size(inode
, endoff
))
683 ceph_check_caps(ci
, CHECK_CAPS_AUTHONLY
, NULL
);
686 spin_lock(&ci
->i_ceph_lock
);
687 ci
->i_inline_version
= CEPH_INLINE_NONE
;
688 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
,
689 &aio_req
->prealloc_cf
);
690 spin_unlock(&ci
->i_ceph_lock
);
692 __mark_inode_dirty(inode
, dirty
);
696 ceph_put_cap_refs(ci
, (aio_req
->write
? CEPH_CAP_FILE_WR
:
699 aio_req
->iocb
->ki_complete(aio_req
->iocb
, ret
, 0);
701 ceph_free_cap_flush(aio_req
->prealloc_cf
);
705 static void ceph_aio_complete_req(struct ceph_osd_request
*req
)
707 int rc
= req
->r_result
;
708 struct inode
*inode
= req
->r_inode
;
709 struct ceph_aio_request
*aio_req
= req
->r_priv
;
710 struct ceph_osd_data
*osd_data
= osd_req_op_extent_osd_data(req
, 0);
711 int num_pages
= calc_pages_for((u64
)osd_data
->alignment
,
714 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
715 inode
, rc
, osd_data
->length
);
717 if (rc
== -EOLDSNAPC
) {
718 struct ceph_aio_work
*aio_work
;
719 BUG_ON(!aio_req
->write
);
721 aio_work
= kmalloc(sizeof(*aio_work
), GFP_NOFS
);
723 INIT_WORK(&aio_work
->work
, ceph_aio_retry_work
);
725 queue_work(ceph_inode_to_client(inode
)->inode_wq
,
730 } else if (!aio_req
->write
) {
733 if (rc
>= 0 && osd_data
->length
> rc
) {
734 int zoff
= osd_data
->alignment
+ rc
;
735 int zlen
= osd_data
->length
- rc
;
737 * If read is satisfied by single OSD request,
738 * it can pass EOF. Otherwise read is within
741 if (aio_req
->num_reqs
== 1) {
742 loff_t i_size
= i_size_read(inode
);
743 loff_t endoff
= aio_req
->iocb
->ki_pos
+ rc
;
745 zlen
= min_t(size_t, zlen
,
747 aio_req
->total_len
= rc
+ zlen
;
751 ceph_zero_page_vector_range(zoff
, zlen
,
756 ceph_put_page_vector(osd_data
->pages
, num_pages
, aio_req
->should_dirty
);
757 ceph_osdc_put_request(req
);
760 cmpxchg(&aio_req
->error
, 0, rc
);
762 ceph_aio_complete(inode
, aio_req
);
766 static void ceph_aio_retry_work(struct work_struct
*work
)
768 struct ceph_aio_work
*aio_work
=
769 container_of(work
, struct ceph_aio_work
, work
);
770 struct ceph_osd_request
*orig_req
= aio_work
->req
;
771 struct ceph_aio_request
*aio_req
= orig_req
->r_priv
;
772 struct inode
*inode
= orig_req
->r_inode
;
773 struct ceph_inode_info
*ci
= ceph_inode(inode
);
774 struct ceph_snap_context
*snapc
;
775 struct ceph_osd_request
*req
;
778 spin_lock(&ci
->i_ceph_lock
);
779 if (__ceph_have_pending_cap_snap(ci
)) {
780 struct ceph_cap_snap
*capsnap
=
781 list_last_entry(&ci
->i_cap_snaps
,
782 struct ceph_cap_snap
,
784 snapc
= ceph_get_snap_context(capsnap
->context
);
786 BUG_ON(!ci
->i_head_snapc
);
787 snapc
= ceph_get_snap_context(ci
->i_head_snapc
);
789 spin_unlock(&ci
->i_ceph_lock
);
791 req
= ceph_osdc_alloc_request(orig_req
->r_osdc
, snapc
, 2,
799 req
->r_flags
= /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE
;
800 ceph_oloc_copy(&req
->r_base_oloc
, &orig_req
->r_base_oloc
);
801 ceph_oid_copy(&req
->r_base_oid
, &orig_req
->r_base_oid
);
803 ret
= ceph_osdc_alloc_messages(req
, GFP_NOFS
);
805 ceph_osdc_put_request(req
);
810 req
->r_ops
[0] = orig_req
->r_ops
[0];
812 req
->r_mtime
= aio_req
->mtime
;
813 req
->r_data_offset
= req
->r_ops
[0].extent
.offset
;
815 ceph_osdc_put_request(orig_req
);
817 req
->r_callback
= ceph_aio_complete_req
;
818 req
->r_inode
= inode
;
819 req
->r_priv
= aio_req
;
820 req
->r_abort_on_full
= true;
822 ret
= ceph_osdc_start_request(req
->r_osdc
, req
, false);
826 ceph_aio_complete_req(req
);
829 ceph_put_snap_context(snapc
);
834 ceph_direct_read_write(struct kiocb
*iocb
, struct iov_iter
*iter
,
835 struct ceph_snap_context
*snapc
,
836 struct ceph_cap_flush
**pcf
)
838 struct file
*file
= iocb
->ki_filp
;
839 struct inode
*inode
= file_inode(file
);
840 struct ceph_inode_info
*ci
= ceph_inode(inode
);
841 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
842 struct ceph_vino vino
;
843 struct ceph_osd_request
*req
;
845 struct ceph_aio_request
*aio_req
= NULL
;
849 struct timespec mtime
= current_time(inode
);
850 size_t count
= iov_iter_count(iter
);
851 loff_t pos
= iocb
->ki_pos
;
852 bool write
= iov_iter_rw(iter
) == WRITE
;
853 bool should_dirty
= !write
&& iter_is_iovec(iter
);
855 if (write
&& ceph_snap(file_inode(file
)) != CEPH_NOSNAP
)
858 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
859 (write
? "write" : "read"), file
, pos
, (unsigned)count
,
862 ret
= filemap_write_and_wait_range(inode
->i_mapping
, pos
, pos
+ count
);
867 int ret2
= invalidate_inode_pages2_range(inode
->i_mapping
,
869 (pos
+ count
) >> PAGE_SHIFT
);
871 dout("invalidate_inode_pages2_range returned %d\n", ret2
);
873 flags
= /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE
;
875 flags
= CEPH_OSD_FLAG_READ
;
878 while (iov_iter_count(iter
) > 0) {
879 u64 size
= dio_get_pagev_size(iter
);
884 size
= min_t(u64
, size
, fsc
->mount_options
->wsize
);
886 size
= min_t(u64
, size
, fsc
->mount_options
->rsize
);
888 vino
= ceph_vino(inode
);
889 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
892 write
? CEPH_OSD_OP_WRITE
:
904 pages
= dio_get_pages_alloc(iter
, len
, &start
, &num_pages
);
906 ceph_osdc_put_request(req
);
907 ret
= PTR_ERR(pages
);
912 * To simplify error handling, allow AIO when IO within i_size
913 * or IO can be satisfied by single OSD request.
915 if (pos
== iocb
->ki_pos
&& !is_sync_kiocb(iocb
) &&
916 (len
== count
|| pos
+ count
<= i_size_read(inode
))) {
917 aio_req
= kzalloc(sizeof(*aio_req
), GFP_KERNEL
);
919 aio_req
->iocb
= iocb
;
920 aio_req
->write
= write
;
921 aio_req
->should_dirty
= should_dirty
;
922 INIT_LIST_HEAD(&aio_req
->osd_reqs
);
924 aio_req
->mtime
= mtime
;
925 swap(aio_req
->prealloc_cf
, *pcf
);
933 * throw out any page cache pages in this range. this
936 truncate_inode_pages_range(inode
->i_mapping
, pos
,
937 (pos
+len
) | (PAGE_SIZE
- 1));
939 req
->r_mtime
= mtime
;
942 osd_req_op_extent_osd_data_pages(req
, 0, pages
, len
, start
,
946 aio_req
->total_len
+= len
;
948 atomic_inc(&aio_req
->pending_reqs
);
950 req
->r_callback
= ceph_aio_complete_req
;
951 req
->r_inode
= inode
;
952 req
->r_priv
= aio_req
;
953 list_add_tail(&req
->r_unsafe_item
, &aio_req
->osd_reqs
);
956 iov_iter_advance(iter
, len
);
960 ret
= ceph_osdc_start_request(req
->r_osdc
, req
, false);
962 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
964 size
= i_size_read(inode
);
968 if (ret
>= 0 && ret
< len
&& pos
+ ret
< size
) {
969 int zlen
= min_t(size_t, len
- ret
,
971 ceph_zero_page_vector_range(start
+ ret
, zlen
,
979 ceph_put_page_vector(pages
, num_pages
, should_dirty
);
981 ceph_osdc_put_request(req
);
986 iov_iter_advance(iter
, len
);
988 if (!write
&& pos
>= size
)
991 if (write
&& pos
> size
) {
992 if (ceph_inode_set_size(inode
, pos
))
993 ceph_check_caps(ceph_inode(inode
),
1000 LIST_HEAD(osd_reqs
);
1002 if (aio_req
->num_reqs
== 0) {
1007 ceph_get_cap_refs(ci
, write
? CEPH_CAP_FILE_WR
:
1010 list_splice(&aio_req
->osd_reqs
, &osd_reqs
);
1011 while (!list_empty(&osd_reqs
)) {
1012 req
= list_first_entry(&osd_reqs
,
1013 struct ceph_osd_request
,
1015 list_del_init(&req
->r_unsafe_item
);
1017 ret
= ceph_osdc_start_request(req
->r_osdc
,
1020 req
->r_result
= ret
;
1021 ceph_aio_complete_req(req
);
1024 return -EIOCBQUEUED
;
1027 if (ret
!= -EOLDSNAPC
&& pos
> iocb
->ki_pos
) {
1028 ret
= pos
- iocb
->ki_pos
;
1035 * Synchronous write, straight from __user pointer or user pages.
1037 * If write spans object boundary, just do multiple writes. (For a
1038 * correct atomic write, we should e.g. take write locks on all
1039 * objects, rollback on failure, etc.)
1042 ceph_sync_write(struct kiocb
*iocb
, struct iov_iter
*from
, loff_t pos
,
1043 struct ceph_snap_context
*snapc
)
1045 struct file
*file
= iocb
->ki_filp
;
1046 struct inode
*inode
= file_inode(file
);
1047 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1048 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
1049 struct ceph_vino vino
;
1050 struct ceph_osd_request
*req
;
1051 struct page
**pages
;
1057 bool check_caps
= false;
1058 struct timespec mtime
= current_time(inode
);
1059 size_t count
= iov_iter_count(from
);
1061 if (ceph_snap(file_inode(file
)) != CEPH_NOSNAP
)
1064 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1065 file
, pos
, (unsigned)count
, snapc
, snapc
->seq
);
1067 ret
= filemap_write_and_wait_range(inode
->i_mapping
, pos
, pos
+ count
);
1071 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
1073 (pos
+ count
) >> PAGE_SHIFT
);
1075 dout("invalidate_inode_pages2_range returned %d\n", ret
);
1077 flags
= /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE
;
1079 while ((len
= iov_iter_count(from
)) > 0) {
1083 vino
= ceph_vino(inode
);
1084 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
1085 vino
, pos
, &len
, 0, 1,
1086 CEPH_OSD_OP_WRITE
, flags
, snapc
,
1088 ci
->i_truncate_size
,
1096 * write from beginning of first page,
1097 * regardless of io alignment
1099 num_pages
= (len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
1101 pages
= ceph_alloc_page_vector(num_pages
, GFP_KERNEL
);
1102 if (IS_ERR(pages
)) {
1103 ret
= PTR_ERR(pages
);
1108 for (n
= 0; n
< num_pages
; n
++) {
1109 size_t plen
= min_t(size_t, left
, PAGE_SIZE
);
1110 ret
= copy_page_from_iter(pages
[n
], 0, plen
, from
);
1119 ceph_release_page_vector(pages
, num_pages
);
1123 req
->r_inode
= inode
;
1125 osd_req_op_extent_osd_data_pages(req
, 0, pages
, len
, 0,
1128 req
->r_mtime
= mtime
;
1129 ret
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
1131 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
1134 ceph_osdc_put_request(req
);
1136 ceph_set_error_write(ci
);
1140 ceph_clear_error_write(ci
);
1143 if (pos
> i_size_read(inode
)) {
1144 check_caps
= ceph_inode_set_size(inode
, pos
);
1146 ceph_check_caps(ceph_inode(inode
),
1147 CHECK_CAPS_AUTHONLY
,
1153 if (ret
!= -EOLDSNAPC
&& written
> 0) {
1161 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1162 * Atomically grab references, so that those bits are not released
1163 * back to the MDS mid-read.
1165 * Hmm, the sync read case isn't actually async... should it be?
1167 static ssize_t
ceph_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
)
1169 struct file
*filp
= iocb
->ki_filp
;
1170 struct ceph_file_info
*fi
= filp
->private_data
;
1171 size_t len
= iov_iter_count(to
);
1172 struct inode
*inode
= file_inode(filp
);
1173 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1174 struct page
*pinned_page
= NULL
;
1177 int retry_op
= 0, read
= 0;
1180 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1181 inode
, ceph_vinop(inode
), iocb
->ki_pos
, (unsigned)len
, inode
);
1183 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1184 want
= CEPH_CAP_FILE_CACHE
| CEPH_CAP_FILE_LAZYIO
;
1186 want
= CEPH_CAP_FILE_CACHE
;
1187 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_RD
, want
, -1, &got
, &pinned_page
);
1191 if ((got
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) == 0 ||
1192 (iocb
->ki_flags
& IOCB_DIRECT
) ||
1193 (fi
->flags
& CEPH_F_SYNC
)) {
1195 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1196 inode
, ceph_vinop(inode
), iocb
->ki_pos
, (unsigned)len
,
1197 ceph_cap_string(got
));
1199 if (ci
->i_inline_version
== CEPH_INLINE_NONE
) {
1200 if (!retry_op
&& (iocb
->ki_flags
& IOCB_DIRECT
)) {
1201 ret
= ceph_direct_read_write(iocb
, to
,
1203 if (ret
>= 0 && ret
< len
)
1204 retry_op
= CHECK_EOF
;
1206 ret
= ceph_sync_read(iocb
, to
, &retry_op
);
1209 retry_op
= READ_INLINE
;
1212 CEPH_DEFINE_RW_CONTEXT(rw_ctx
, got
);
1213 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1214 inode
, ceph_vinop(inode
), iocb
->ki_pos
, (unsigned)len
,
1215 ceph_cap_string(got
));
1216 ceph_add_rw_context(fi
, &rw_ctx
);
1217 ret
= generic_file_read_iter(iocb
, to
);
1218 ceph_del_rw_context(fi
, &rw_ctx
);
1220 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1221 inode
, ceph_vinop(inode
), ceph_cap_string(got
), (int)ret
);
1223 put_page(pinned_page
);
1226 ceph_put_cap_refs(ci
, got
);
1227 if (retry_op
> HAVE_RETRIED
&& ret
>= 0) {
1229 struct page
*page
= NULL
;
1231 if (retry_op
== READ_INLINE
) {
1232 page
= __page_cache_alloc(GFP_KERNEL
);
1237 statret
= __ceph_do_getattr(inode
, page
,
1238 CEPH_STAT_CAP_INLINE_DATA
, !!page
);
1242 if (statret
== -ENODATA
) {
1243 BUG_ON(retry_op
!= READ_INLINE
);
1249 i_size
= i_size_read(inode
);
1250 if (retry_op
== READ_INLINE
) {
1251 BUG_ON(ret
> 0 || read
> 0);
1252 if (iocb
->ki_pos
< i_size
&&
1253 iocb
->ki_pos
< PAGE_SIZE
) {
1254 loff_t end
= min_t(loff_t
, i_size
,
1255 iocb
->ki_pos
+ len
);
1256 end
= min_t(loff_t
, end
, PAGE_SIZE
);
1258 zero_user_segment(page
, statret
, end
);
1259 ret
= copy_page_to_iter(page
,
1260 iocb
->ki_pos
& ~PAGE_MASK
,
1261 end
- iocb
->ki_pos
, to
);
1262 iocb
->ki_pos
+= ret
;
1265 if (iocb
->ki_pos
< i_size
&& read
< len
) {
1266 size_t zlen
= min_t(size_t, len
- read
,
1267 i_size
- iocb
->ki_pos
);
1268 ret
= iov_iter_zero(zlen
, to
);
1269 iocb
->ki_pos
+= ret
;
1272 __free_pages(page
, 0);
1276 /* hit EOF or hole? */
1277 if (retry_op
== CHECK_EOF
&& iocb
->ki_pos
< i_size
&&
1279 dout("sync_read hit hole, ppos %lld < size %lld"
1280 ", reading more\n", iocb
->ki_pos
, i_size
);
1284 retry_op
= HAVE_RETRIED
;
1296 * Take cap references to avoid releasing caps to MDS mid-write.
1298 * If we are synchronous, and write with an old snap context, the OSD
1299 * may return EOLDSNAPC. In that case, retry the write.. _after_
1300 * dropping our cap refs and allowing the pending snap to logically
1301 * complete _before_ this write occurs.
1303 * If we are near ENOSPC, write synchronously.
1305 static ssize_t
ceph_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
)
1307 struct file
*file
= iocb
->ki_filp
;
1308 struct ceph_file_info
*fi
= file
->private_data
;
1309 struct inode
*inode
= file_inode(file
);
1310 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1311 struct ceph_osd_client
*osdc
=
1312 &ceph_sb_to_client(inode
->i_sb
)->client
->osdc
;
1313 struct ceph_cap_flush
*prealloc_cf
;
1314 ssize_t count
, written
= 0;
1318 if (ceph_snap(inode
) != CEPH_NOSNAP
)
1321 prealloc_cf
= ceph_alloc_cap_flush();
1328 /* We can write back this queue in page reclaim */
1329 current
->backing_dev_info
= inode_to_bdi(inode
);
1331 if (iocb
->ki_flags
& IOCB_APPEND
) {
1332 err
= ceph_do_getattr(inode
, CEPH_STAT_CAP_SIZE
, false);
1337 err
= generic_write_checks(iocb
, from
);
1342 count
= iov_iter_count(from
);
1343 err
= file_remove_privs(file
);
1347 err
= file_update_time(file
);
1351 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
1352 err
= ceph_uninline_data(file
, NULL
);
1357 /* FIXME: not complete since it doesn't account for being at quota */
1358 if (ceph_osdmap_flag(osdc
, CEPH_OSDMAP_FULL
)) {
1363 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1364 inode
, ceph_vinop(inode
), pos
, count
, i_size_read(inode
));
1365 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1366 want
= CEPH_CAP_FILE_BUFFER
| CEPH_CAP_FILE_LAZYIO
;
1368 want
= CEPH_CAP_FILE_BUFFER
;
1370 err
= ceph_get_caps(ci
, CEPH_CAP_FILE_WR
, want
, pos
+ count
,
1375 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1376 inode
, ceph_vinop(inode
), pos
, count
, ceph_cap_string(got
));
1378 if ((got
& (CEPH_CAP_FILE_BUFFER
|CEPH_CAP_FILE_LAZYIO
)) == 0 ||
1379 (iocb
->ki_flags
& IOCB_DIRECT
) || (fi
->flags
& CEPH_F_SYNC
) ||
1380 (ci
->i_ceph_flags
& CEPH_I_ERROR_WRITE
)) {
1381 struct ceph_snap_context
*snapc
;
1382 struct iov_iter data
;
1383 inode_unlock(inode
);
1385 spin_lock(&ci
->i_ceph_lock
);
1386 if (__ceph_have_pending_cap_snap(ci
)) {
1387 struct ceph_cap_snap
*capsnap
=
1388 list_last_entry(&ci
->i_cap_snaps
,
1389 struct ceph_cap_snap
,
1391 snapc
= ceph_get_snap_context(capsnap
->context
);
1393 BUG_ON(!ci
->i_head_snapc
);
1394 snapc
= ceph_get_snap_context(ci
->i_head_snapc
);
1396 spin_unlock(&ci
->i_ceph_lock
);
1398 /* we might need to revert back to that point */
1400 if (iocb
->ki_flags
& IOCB_DIRECT
)
1401 written
= ceph_direct_read_write(iocb
, &data
, snapc
,
1404 written
= ceph_sync_write(iocb
, &data
, pos
, snapc
);
1406 iov_iter_advance(from
, written
);
1407 ceph_put_snap_context(snapc
);
1410 * No need to acquire the i_truncate_mutex. Because
1411 * the MDS revokes Fwb caps before sending truncate
1412 * message to us. We can't get Fwb cap while there
1413 * are pending vmtruncate. So write and vmtruncate
1414 * can not run at the same time
1416 written
= generic_perform_write(file
, from
, pos
);
1417 if (likely(written
>= 0))
1418 iocb
->ki_pos
= pos
+ written
;
1419 inode_unlock(inode
);
1424 spin_lock(&ci
->i_ceph_lock
);
1425 ci
->i_inline_version
= CEPH_INLINE_NONE
;
1426 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
,
1428 spin_unlock(&ci
->i_ceph_lock
);
1430 __mark_inode_dirty(inode
, dirty
);
1433 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1434 inode
, ceph_vinop(inode
), pos
, (unsigned)count
,
1435 ceph_cap_string(got
));
1436 ceph_put_cap_refs(ci
, got
);
1438 if (written
== -EOLDSNAPC
) {
1439 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1440 inode
, ceph_vinop(inode
), pos
, (unsigned)count
);
1445 if (ceph_osdmap_flag(osdc
, CEPH_OSDMAP_NEARFULL
))
1446 iocb
->ki_flags
|= IOCB_DSYNC
;
1447 written
= generic_write_sync(iocb
, written
);
1453 inode_unlock(inode
);
1455 ceph_free_cap_flush(prealloc_cf
);
1456 current
->backing_dev_info
= NULL
;
1457 return written
? written
: err
;
1461 * llseek. be sure to verify file size on SEEK_END.
1463 static loff_t
ceph_llseek(struct file
*file
, loff_t offset
, int whence
)
1465 struct inode
*inode
= file
->f_mapping
->host
;
1471 if (whence
== SEEK_END
|| whence
== SEEK_DATA
|| whence
== SEEK_HOLE
) {
1472 ret
= ceph_do_getattr(inode
, CEPH_STAT_CAP_SIZE
, false);
1477 i_size
= i_size_read(inode
);
1484 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1485 * position-querying operation. Avoid rewriting the "same"
1486 * f_pos value back to the file because a concurrent read(),
1487 * write() or lseek() might have altered it
1493 offset
+= file
->f_pos
;
1496 if (offset
< 0 || offset
>= i_size
) {
1502 if (offset
< 0 || offset
>= i_size
) {
1510 ret
= vfs_setpos(file
, offset
, inode
->i_sb
->s_maxbytes
);
1513 inode_unlock(inode
);
1517 static inline void ceph_zero_partial_page(
1518 struct inode
*inode
, loff_t offset
, unsigned size
)
1521 pgoff_t index
= offset
>> PAGE_SHIFT
;
1523 page
= find_lock_page(inode
->i_mapping
, index
);
1525 wait_on_page_writeback(page
);
1526 zero_user(page
, offset
& (PAGE_SIZE
- 1), size
);
1532 static void ceph_zero_pagecache_range(struct inode
*inode
, loff_t offset
,
1535 loff_t nearly
= round_up(offset
, PAGE_SIZE
);
1536 if (offset
< nearly
) {
1537 loff_t size
= nearly
- offset
;
1540 ceph_zero_partial_page(inode
, offset
, size
);
1544 if (length
>= PAGE_SIZE
) {
1545 loff_t size
= round_down(length
, PAGE_SIZE
);
1546 truncate_pagecache_range(inode
, offset
, offset
+ size
- 1);
1551 ceph_zero_partial_page(inode
, offset
, length
);
1554 static int ceph_zero_partial_object(struct inode
*inode
,
1555 loff_t offset
, loff_t
*length
)
1557 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1558 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
1559 struct ceph_osd_request
*req
;
1565 op
= offset
? CEPH_OSD_OP_DELETE
: CEPH_OSD_OP_TRUNCATE
;
1568 op
= CEPH_OSD_OP_ZERO
;
1571 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
1575 CEPH_OSD_FLAG_WRITE
,
1582 req
->r_mtime
= inode
->i_mtime
;
1583 ret
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
1585 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
1589 ceph_osdc_put_request(req
);
1595 static int ceph_zero_objects(struct inode
*inode
, loff_t offset
, loff_t length
)
1598 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1599 s32 stripe_unit
= ci
->i_layout
.stripe_unit
;
1600 s32 stripe_count
= ci
->i_layout
.stripe_count
;
1601 s32 object_size
= ci
->i_layout
.object_size
;
1602 u64 object_set_size
= object_size
* stripe_count
;
1605 /* round offset up to next period boundary */
1606 nearly
= offset
+ object_set_size
- 1;
1608 nearly
-= do_div(t
, object_set_size
);
1610 while (length
&& offset
< nearly
) {
1611 loff_t size
= length
;
1612 ret
= ceph_zero_partial_object(inode
, offset
, &size
);
1618 while (length
>= object_set_size
) {
1620 loff_t pos
= offset
;
1621 for (i
= 0; i
< stripe_count
; ++i
) {
1622 ret
= ceph_zero_partial_object(inode
, pos
, NULL
);
1627 offset
+= object_set_size
;
1628 length
-= object_set_size
;
1631 loff_t size
= length
;
1632 ret
= ceph_zero_partial_object(inode
, offset
, &size
);
1641 static long ceph_fallocate(struct file
*file
, int mode
,
1642 loff_t offset
, loff_t length
)
1644 struct ceph_file_info
*fi
= file
->private_data
;
1645 struct inode
*inode
= file_inode(file
);
1646 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1647 struct ceph_osd_client
*osdc
=
1648 &ceph_inode_to_client(inode
)->client
->osdc
;
1649 struct ceph_cap_flush
*prealloc_cf
;
1656 if (mode
& ~(FALLOC_FL_KEEP_SIZE
| FALLOC_FL_PUNCH_HOLE
))
1659 if (!S_ISREG(inode
->i_mode
))
1662 prealloc_cf
= ceph_alloc_cap_flush();
1668 if (ceph_snap(inode
) != CEPH_NOSNAP
) {
1673 if (ceph_osdmap_flag(osdc
, CEPH_OSDMAP_FULL
) &&
1674 !(mode
& FALLOC_FL_PUNCH_HOLE
)) {
1679 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
1680 ret
= ceph_uninline_data(file
, NULL
);
1685 size
= i_size_read(inode
);
1686 if (!(mode
& FALLOC_FL_KEEP_SIZE
)) {
1687 endoff
= offset
+ length
;
1688 ret
= inode_newsize_ok(inode
, endoff
);
1693 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1694 want
= CEPH_CAP_FILE_BUFFER
| CEPH_CAP_FILE_LAZYIO
;
1696 want
= CEPH_CAP_FILE_BUFFER
;
1698 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_WR
, want
, endoff
, &got
, NULL
);
1702 if (mode
& FALLOC_FL_PUNCH_HOLE
) {
1704 ceph_zero_pagecache_range(inode
, offset
, length
);
1705 ret
= ceph_zero_objects(inode
, offset
, length
);
1706 } else if (endoff
> size
) {
1707 truncate_pagecache_range(inode
, size
, -1);
1708 if (ceph_inode_set_size(inode
, endoff
))
1709 ceph_check_caps(ceph_inode(inode
),
1710 CHECK_CAPS_AUTHONLY
, NULL
);
1714 spin_lock(&ci
->i_ceph_lock
);
1715 ci
->i_inline_version
= CEPH_INLINE_NONE
;
1716 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
,
1718 spin_unlock(&ci
->i_ceph_lock
);
1720 __mark_inode_dirty(inode
, dirty
);
1723 ceph_put_cap_refs(ci
, got
);
1725 inode_unlock(inode
);
1726 ceph_free_cap_flush(prealloc_cf
);
1730 const struct file_operations ceph_file_fops
= {
1732 .release
= ceph_release
,
1733 .llseek
= ceph_llseek
,
1734 .read_iter
= ceph_read_iter
,
1735 .write_iter
= ceph_write_iter
,
1737 .fsync
= ceph_fsync
,
1739 .flock
= ceph_flock
,
1740 .splice_read
= generic_file_splice_read
,
1741 .splice_write
= iter_file_splice_write
,
1742 .unlocked_ioctl
= ceph_ioctl
,
1743 .compat_ioctl
= ceph_ioctl
,
1744 .fallocate
= ceph_fallocate
,