1 #include <linux/ceph/ceph_debug.h>
3 #include <linux/module.h>
4 #include <linux/sched.h>
5 #include <linux/slab.h>
6 #include <linux/file.h>
7 #include <linux/mount.h>
8 #include <linux/namei.h>
9 #include <linux/writeback.h>
10 #include <linux/falloc.h>
13 #include "mds_client.h"
17 * Ceph file operations
19 * Implement basic open/close functionality, and implement
22 * We implement three modes of file I/O:
23 * - buffered uses the generic_file_aio_{read,write} helpers
25 * - synchronous is used when there is multi-client read/write
26 * sharing, avoids the page cache, and synchronously waits for an
29 * - direct io takes the variant of the sync path that references
30 * user pages directly.
32 * fsync() flushes and waits on dirty pages, but just queues metadata
33 * for writeback: since the MDS can recover size and mtime there is no
34 * need to wait for MDS acknowledgement.
39 * Prepare an open request. Preallocate ceph_cap to avoid an
40 * inopportune ENOMEM later.
42 static struct ceph_mds_request
*
43 prepare_open_request(struct super_block
*sb
, int flags
, int create_mode
)
45 struct ceph_fs_client
*fsc
= ceph_sb_to_client(sb
);
46 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
47 struct ceph_mds_request
*req
;
48 int want_auth
= USE_ANY_MDS
;
49 int op
= (flags
& O_CREAT
) ? CEPH_MDS_OP_CREATE
: CEPH_MDS_OP_OPEN
;
51 if (flags
& (O_WRONLY
|O_RDWR
|O_CREAT
|O_TRUNC
))
52 want_auth
= USE_AUTH_MDS
;
54 req
= ceph_mdsc_create_request(mdsc
, op
, want_auth
);
57 req
->r_fmode
= ceph_flags_to_mode(flags
);
58 req
->r_args
.open
.flags
= cpu_to_le32(flags
);
59 req
->r_args
.open
.mode
= cpu_to_le32(create_mode
);
65 * initialize private struct file data.
66 * if we fail, clean up by dropping fmode reference on the ceph_inode
68 static int ceph_init_file(struct inode
*inode
, struct file
*file
, int fmode
)
70 struct ceph_file_info
*cf
;
72 struct ceph_inode_info
*ci
= ceph_inode(inode
);
73 struct ceph_fs_client
*fsc
= ceph_sb_to_client(inode
->i_sb
);
74 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
76 switch (inode
->i_mode
& S_IFMT
) {
78 /* First file open request creates the cookie, we want to keep
79 * this cookie around for the filetime of the inode as not to
80 * have to worry about fscache register / revoke / operation
83 * Also, if we know the operation is going to invalidate data
84 * (non readonly) just nuke the cache right away.
86 ceph_fscache_register_inode_cookie(mdsc
->fsc
, ci
);
87 if ((fmode
& CEPH_FILE_MODE_WR
))
88 ceph_fscache_invalidate(inode
);
90 dout("init_file %p %p 0%o (regular)\n", inode
, file
,
92 cf
= kmem_cache_alloc(ceph_file_cachep
, GFP_KERNEL
| __GFP_ZERO
);
94 ceph_put_fmode(ceph_inode(inode
), fmode
); /* clean up */
99 cf
->readdir_cache_idx
= -1;
100 file
->private_data
= cf
;
101 BUG_ON(inode
->i_fop
->release
!= ceph_release
);
105 dout("init_file %p %p 0%o (symlink)\n", inode
, file
,
107 ceph_put_fmode(ceph_inode(inode
), fmode
); /* clean up */
111 dout("init_file %p %p 0%o (special)\n", inode
, file
,
114 * we need to drop the open ref now, since we don't
115 * have .release set to ceph_release.
117 ceph_put_fmode(ceph_inode(inode
), fmode
); /* clean up */
118 BUG_ON(inode
->i_fop
->release
== ceph_release
);
120 /* call the proper open fop */
121 ret
= inode
->i_fop
->open(inode
, file
);
127 * If we already have the requisite capabilities, we can satisfy
128 * the open request locally (no need to request new caps from the
129 * MDS). We do, however, need to inform the MDS (asynchronously)
130 * if our wanted caps set expands.
132 int ceph_open(struct inode
*inode
, struct file
*file
)
134 struct ceph_inode_info
*ci
= ceph_inode(inode
);
135 struct ceph_fs_client
*fsc
= ceph_sb_to_client(inode
->i_sb
);
136 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
137 struct ceph_mds_request
*req
;
138 struct ceph_file_info
*cf
= file
->private_data
;
140 int flags
, fmode
, wanted
;
143 dout("open file %p is already opened\n", file
);
147 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
148 flags
= file
->f_flags
& ~(O_CREAT
|O_EXCL
);
149 if (S_ISDIR(inode
->i_mode
))
150 flags
= O_DIRECTORY
; /* mds likes to know */
152 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode
,
153 ceph_vinop(inode
), file
, flags
, file
->f_flags
);
154 fmode
= ceph_flags_to_mode(flags
);
155 wanted
= ceph_caps_for_mode(fmode
);
157 /* snapped files are read-only */
158 if (ceph_snap(inode
) != CEPH_NOSNAP
&& (file
->f_mode
& FMODE_WRITE
))
161 /* trivially open snapdir */
162 if (ceph_snap(inode
) == CEPH_SNAPDIR
) {
163 spin_lock(&ci
->i_ceph_lock
);
164 __ceph_get_fmode(ci
, fmode
);
165 spin_unlock(&ci
->i_ceph_lock
);
166 return ceph_init_file(inode
, file
, fmode
);
170 * No need to block if we have caps on the auth MDS (for
171 * write) or any MDS (for read). Update wanted set
174 spin_lock(&ci
->i_ceph_lock
);
175 if (__ceph_is_any_real_caps(ci
) &&
176 (((fmode
& CEPH_FILE_MODE_WR
) == 0) || ci
->i_auth_cap
)) {
177 int mds_wanted
= __ceph_caps_mds_wanted(ci
);
178 int issued
= __ceph_caps_issued(ci
, NULL
);
180 dout("open %p fmode %d want %s issued %s using existing\n",
181 inode
, fmode
, ceph_cap_string(wanted
),
182 ceph_cap_string(issued
));
183 __ceph_get_fmode(ci
, fmode
);
184 spin_unlock(&ci
->i_ceph_lock
);
187 if ((issued
& wanted
) != wanted
&&
188 (mds_wanted
& wanted
) != wanted
&&
189 ceph_snap(inode
) != CEPH_SNAPDIR
)
190 ceph_check_caps(ci
, 0, NULL
);
192 return ceph_init_file(inode
, file
, fmode
);
193 } else if (ceph_snap(inode
) != CEPH_NOSNAP
&&
194 (ci
->i_snap_caps
& wanted
) == wanted
) {
195 __ceph_get_fmode(ci
, fmode
);
196 spin_unlock(&ci
->i_ceph_lock
);
197 return ceph_init_file(inode
, file
, fmode
);
200 spin_unlock(&ci
->i_ceph_lock
);
202 dout("open fmode %d wants %s\n", fmode
, ceph_cap_string(wanted
));
203 req
= prepare_open_request(inode
->i_sb
, flags
, 0);
208 req
->r_inode
= inode
;
212 err
= ceph_mdsc_do_request(mdsc
, NULL
, req
);
214 err
= ceph_init_file(inode
, file
, req
->r_fmode
);
215 ceph_mdsc_put_request(req
);
216 dout("open result=%d on %llx.%llx\n", err
, ceph_vinop(inode
));
223 * Do a lookup + open with a single request. If we get a non-existent
224 * file or symlink, return 1 so the VFS can retry.
226 int ceph_atomic_open(struct inode
*dir
, struct dentry
*dentry
,
227 struct file
*file
, unsigned flags
, umode_t mode
,
230 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
231 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
232 struct ceph_mds_request
*req
;
234 struct ceph_acls_info acls
= {};
237 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
239 d_unhashed(dentry
) ? "unhashed" : "hashed", flags
, mode
);
241 if (dentry
->d_name
.len
> NAME_MAX
)
242 return -ENAMETOOLONG
;
244 err
= ceph_init_dentry(dentry
);
248 if (flags
& O_CREAT
) {
249 err
= ceph_pre_init_acls(dir
, &mode
, &acls
);
255 req
= prepare_open_request(dir
->i_sb
, flags
, mode
);
260 req
->r_dentry
= dget(dentry
);
262 if (flags
& O_CREAT
) {
263 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
264 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
266 req
->r_pagelist
= acls
.pagelist
;
267 acls
.pagelist
= NULL
;
270 req
->r_locked_dir
= dir
; /* caller holds dir->i_mutex */
271 err
= ceph_mdsc_do_request(mdsc
,
272 (flags
& (O_CREAT
|O_TRUNC
)) ? dir
: NULL
,
274 err
= ceph_handle_snapdir(req
, dentry
, err
);
278 if ((flags
& O_CREAT
) && !req
->r_reply_info
.head
->is_dentry
)
279 err
= ceph_handle_notrace_create(dir
, dentry
);
281 if (d_unhashed(dentry
)) {
282 dn
= ceph_finish_lookup(req
, dentry
, err
);
286 /* we were given a hashed negative dentry */
291 if (dn
|| d_really_is_negative(dentry
) || d_is_symlink(dentry
)) {
292 /* make vfs retry on splice, ENOENT, or symlink */
293 dout("atomic_open finish_no_open on dn %p\n", dn
);
294 err
= finish_no_open(file
, dn
);
296 dout("atomic_open finish_open on dn %p\n", dn
);
297 if (req
->r_op
== CEPH_MDS_OP_CREATE
&& req
->r_reply_info
.has_create_ino
) {
298 ceph_init_inode_acls(d_inode(dentry
), &acls
);
299 *opened
|= FILE_CREATED
;
301 err
= finish_open(file
, dentry
, ceph_open
, opened
);
304 if (!req
->r_err
&& req
->r_target_inode
)
305 ceph_put_fmode(ceph_inode(req
->r_target_inode
), req
->r_fmode
);
306 ceph_mdsc_put_request(req
);
308 ceph_release_acls_info(&acls
);
309 dout("atomic_open result=%d\n", err
);
313 int ceph_release(struct inode
*inode
, struct file
*file
)
315 struct ceph_inode_info
*ci
= ceph_inode(inode
);
316 struct ceph_file_info
*cf
= file
->private_data
;
318 dout("release inode %p file %p\n", inode
, file
);
319 ceph_put_fmode(ci
, cf
->fmode
);
320 if (cf
->last_readdir
)
321 ceph_mdsc_put_request(cf
->last_readdir
);
322 kfree(cf
->last_name
);
324 kmem_cache_free(ceph_file_cachep
, cf
);
326 /* wake up anyone waiting for caps on this inode */
327 wake_up_all(&ci
->i_cap_wq
);
337 * Read a range of bytes striped over one or more objects. Iterate over
338 * objects we stripe over. (That's not atomic, but good enough for now.)
340 * If we get a short result from the OSD, check against i_size; we need to
341 * only return a short read to the caller if we hit EOF.
343 static int striped_read(struct inode
*inode
,
345 struct page
**pages
, int num_pages
,
346 int *checkeof
, bool o_direct
,
347 unsigned long buf_align
)
349 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
350 struct ceph_inode_info
*ci
= ceph_inode(inode
);
351 u64 pos
, this_len
, left
;
352 int io_align
, page_align
;
355 struct page
**page_pos
;
357 bool hit_stripe
, was_short
;
360 * we may need to do multiple reads. not atomic, unfortunately.
365 pages_left
= num_pages
;
367 io_align
= off
& ~PAGE_MASK
;
371 page_align
= (pos
- io_align
+ buf_align
) & ~PAGE_MASK
;
373 page_align
= pos
& ~PAGE_MASK
;
375 ret
= ceph_osdc_readpages(&fsc
->client
->osdc
, ceph_vino(inode
),
376 &ci
->i_layout
, pos
, &this_len
,
379 page_pos
, pages_left
, page_align
);
382 hit_stripe
= this_len
< left
;
383 was_short
= ret
>= 0 && ret
< this_len
;
384 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos
, left
, read
,
385 ret
, hit_stripe
? " HITSTRIPE" : "", was_short
? " SHORT" : "");
389 if (was_short
&& (pos
+ ret
< inode
->i_size
)) {
390 int zlen
= min(this_len
- ret
,
391 inode
->i_size
- pos
- ret
);
392 int zoff
= (o_direct
? buf_align
: io_align
) +
394 dout(" zero gap %llu to %llu\n",
395 pos
+ ret
, pos
+ ret
+ zlen
);
396 ceph_zero_page_vector_range(zoff
, zlen
, pages
);
400 didpages
= (page_align
+ ret
) >> PAGE_CACHE_SHIFT
;
404 page_pos
+= didpages
;
405 pages_left
-= didpages
;
407 /* hit stripe and need continue*/
408 if (left
&& hit_stripe
&& pos
< inode
->i_size
)
414 /* did we bounce off eof? */
415 if (pos
+ left
> inode
->i_size
)
416 *checkeof
= CHECK_EOF
;
419 dout("striped_read returns %d\n", ret
);
424 * Completely synchronous read and write methods. Direct from __user
425 * buffer to osd, or directly to user pages (if O_DIRECT).
427 * If the read spans object boundary, just do multiple reads.
429 static ssize_t
ceph_sync_read(struct kiocb
*iocb
, struct iov_iter
*i
,
432 struct file
*file
= iocb
->ki_filp
;
433 struct inode
*inode
= file_inode(file
);
435 u64 off
= iocb
->ki_pos
;
437 size_t len
= iov_iter_count(i
);
439 dout("sync_read on file %p %llu~%u %s\n", file
, off
,
441 (file
->f_flags
& O_DIRECT
) ? "O_DIRECT" : "");
446 * flush any page cache pages in this range. this
447 * will make concurrent normal and sync io slow,
448 * but it will at least behave sensibly when they are
451 ret
= filemap_write_and_wait_range(inode
->i_mapping
, off
,
456 if (iocb
->ki_flags
& IOCB_DIRECT
) {
457 while (iov_iter_count(i
)) {
461 n
= iov_iter_get_pages_alloc(i
, &pages
, INT_MAX
, &start
);
465 num_pages
= (n
+ start
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
467 ret
= striped_read(inode
, off
, n
,
468 pages
, num_pages
, checkeof
,
471 ceph_put_page_vector(pages
, num_pages
, true);
476 iov_iter_advance(i
, ret
);
481 num_pages
= calc_pages_for(off
, len
);
482 pages
= ceph_alloc_page_vector(num_pages
, GFP_KERNEL
);
484 return PTR_ERR(pages
);
485 ret
= striped_read(inode
, off
, len
, pages
,
486 num_pages
, checkeof
, 0, 0);
492 size_t page_off
= off
& ~PAGE_MASK
;
493 size_t copy
= min_t(size_t,
494 PAGE_SIZE
- page_off
, left
);
495 l
= copy_page_to_iter(pages
[k
++], page_off
,
503 ceph_release_page_vector(pages
, num_pages
);
506 if (off
> iocb
->ki_pos
) {
507 ret
= off
- iocb
->ki_pos
;
511 dout("sync_read result %d\n", ret
);
516 * Write commit request unsafe callback, called to tell us when a
517 * request is unsafe (that is, in flight--has been handed to the
518 * messenger to send to its target osd). It is called again when
519 * we've received a response message indicating the request is
520 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
521 * is completed early (and unsuccessfully) due to a timeout or
524 * This is used if we requested both an ACK and ONDISK commit reply
527 static void ceph_sync_write_unsafe(struct ceph_osd_request
*req
, bool unsafe
)
529 struct ceph_inode_info
*ci
= ceph_inode(req
->r_inode
);
531 dout("%s %p tid %llu %ssafe\n", __func__
, req
, req
->r_tid
,
534 ceph_get_cap_refs(ci
, CEPH_CAP_FILE_WR
);
535 spin_lock(&ci
->i_unsafe_lock
);
536 list_add_tail(&req
->r_unsafe_item
,
537 &ci
->i_unsafe_writes
);
538 spin_unlock(&ci
->i_unsafe_lock
);
540 spin_lock(&ci
->i_unsafe_lock
);
541 list_del_init(&req
->r_unsafe_item
);
542 spin_unlock(&ci
->i_unsafe_lock
);
543 ceph_put_cap_refs(ci
, CEPH_CAP_FILE_WR
);
549 * Synchronous write, straight from __user pointer or user pages.
551 * If write spans object boundary, just do multiple writes. (For a
552 * correct atomic write, we should e.g. take write locks on all
553 * objects, rollback on failure, etc.)
556 ceph_sync_direct_write(struct kiocb
*iocb
, struct iov_iter
*from
, loff_t pos
,
557 struct ceph_snap_context
*snapc
)
559 struct file
*file
= iocb
->ki_filp
;
560 struct inode
*inode
= file_inode(file
);
561 struct ceph_inode_info
*ci
= ceph_inode(inode
);
562 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
563 struct ceph_vino vino
;
564 struct ceph_osd_request
*req
;
571 struct timespec mtime
= CURRENT_TIME
;
572 size_t count
= iov_iter_count(from
);
574 if (ceph_snap(file_inode(file
)) != CEPH_NOSNAP
)
577 dout("sync_direct_write on file %p %lld~%u\n", file
, pos
,
580 ret
= filemap_write_and_wait_range(inode
->i_mapping
, pos
, pos
+ count
);
584 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
585 pos
>> PAGE_CACHE_SHIFT
,
586 (pos
+ count
) >> PAGE_CACHE_SHIFT
);
588 dout("invalidate_inode_pages2_range returned %d\n", ret
);
590 flags
= CEPH_OSD_FLAG_ORDERSNAP
|
591 CEPH_OSD_FLAG_ONDISK
|
594 while (iov_iter_count(from
) > 0) {
595 u64 len
= iov_iter_single_seg_count(from
);
599 vino
= ceph_vino(inode
);
600 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
602 2,/*include a 'startsync' command*/
603 CEPH_OSD_OP_WRITE
, flags
, snapc
,
612 osd_req_op_init(req
, 1, CEPH_OSD_OP_STARTSYNC
, 0);
614 n
= iov_iter_get_pages_alloc(from
, &pages
, len
, &start
);
615 if (unlikely(n
< 0)) {
617 ceph_osdc_put_request(req
);
621 num_pages
= (n
+ start
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
623 * throw out any page cache pages in this range. this
626 truncate_inode_pages_range(inode
->i_mapping
, pos
,
627 (pos
+n
) | (PAGE_CACHE_SIZE
-1));
628 osd_req_op_extent_osd_data_pages(req
, 0, pages
, n
, start
,
631 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
632 ceph_osdc_build_request(req
, pos
, snapc
, vino
.snap
, &mtime
);
634 ret
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
636 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
638 ceph_put_page_vector(pages
, num_pages
, false);
640 ceph_osdc_put_request(req
);
645 iov_iter_advance(from
, n
);
647 if (pos
> i_size_read(inode
)) {
648 check_caps
= ceph_inode_set_size(inode
, pos
);
650 ceph_check_caps(ceph_inode(inode
),
656 if (ret
!= -EOLDSNAPC
&& written
> 0) {
665 * Synchronous write, straight from __user pointer or user pages.
667 * If write spans object boundary, just do multiple writes. (For a
668 * correct atomic write, we should e.g. take write locks on all
669 * objects, rollback on failure, etc.)
672 ceph_sync_write(struct kiocb
*iocb
, struct iov_iter
*from
, loff_t pos
,
673 struct ceph_snap_context
*snapc
)
675 struct file
*file
= iocb
->ki_filp
;
676 struct inode
*inode
= file_inode(file
);
677 struct ceph_inode_info
*ci
= ceph_inode(inode
);
678 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
679 struct ceph_vino vino
;
680 struct ceph_osd_request
*req
;
688 struct timespec mtime
= CURRENT_TIME
;
689 size_t count
= iov_iter_count(from
);
691 if (ceph_snap(file_inode(file
)) != CEPH_NOSNAP
)
694 dout("sync_write on file %p %lld~%u\n", file
, pos
, (unsigned)count
);
696 ret
= filemap_write_and_wait_range(inode
->i_mapping
, pos
, pos
+ count
);
700 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
701 pos
>> PAGE_CACHE_SHIFT
,
702 (pos
+ count
) >> PAGE_CACHE_SHIFT
);
704 dout("invalidate_inode_pages2_range returned %d\n", ret
);
706 flags
= CEPH_OSD_FLAG_ORDERSNAP
|
707 CEPH_OSD_FLAG_ONDISK
|
708 CEPH_OSD_FLAG_WRITE
|
711 while ((len
= iov_iter_count(from
)) > 0) {
715 vino
= ceph_vino(inode
);
716 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
717 vino
, pos
, &len
, 0, 1,
718 CEPH_OSD_OP_WRITE
, flags
, snapc
,
728 * write from beginning of first page,
729 * regardless of io alignment
731 num_pages
= (len
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
733 pages
= ceph_alloc_page_vector(num_pages
, GFP_KERNEL
);
735 ret
= PTR_ERR(pages
);
740 for (n
= 0; n
< num_pages
; n
++) {
741 size_t plen
= min_t(size_t, left
, PAGE_SIZE
);
742 ret
= copy_page_from_iter(pages
[n
], 0, plen
, from
);
751 ceph_release_page_vector(pages
, num_pages
);
755 /* get a second commit callback */
756 req
->r_unsafe_callback
= ceph_sync_write_unsafe
;
757 req
->r_inode
= inode
;
759 osd_req_op_extent_osd_data_pages(req
, 0, pages
, len
, 0,
762 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
763 ceph_osdc_build_request(req
, pos
, snapc
, vino
.snap
, &mtime
);
765 ret
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
767 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
770 ceph_osdc_put_request(req
);
775 if (pos
> i_size_read(inode
)) {
776 check_caps
= ceph_inode_set_size(inode
, pos
);
778 ceph_check_caps(ceph_inode(inode
),
786 if (ret
!= -EOLDSNAPC
&& written
> 0) {
794 * Wrap generic_file_aio_read with checks for cap bits on the inode.
795 * Atomically grab references, so that those bits are not released
796 * back to the MDS mid-read.
798 * Hmm, the sync read case isn't actually async... should it be?
800 static ssize_t
ceph_read_iter(struct kiocb
*iocb
, struct iov_iter
*to
)
802 struct file
*filp
= iocb
->ki_filp
;
803 struct ceph_file_info
*fi
= filp
->private_data
;
804 size_t len
= iov_iter_count(to
);
805 struct inode
*inode
= file_inode(filp
);
806 struct ceph_inode_info
*ci
= ceph_inode(inode
);
807 struct page
*pinned_page
= NULL
;
810 int retry_op
= 0, read
= 0;
813 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
814 inode
, ceph_vinop(inode
), iocb
->ki_pos
, (unsigned)len
, inode
);
816 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
817 want
= CEPH_CAP_FILE_CACHE
| CEPH_CAP_FILE_LAZYIO
;
819 want
= CEPH_CAP_FILE_CACHE
;
820 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_RD
, want
, -1, &got
, &pinned_page
);
824 if ((got
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) == 0 ||
825 (iocb
->ki_flags
& IOCB_DIRECT
) ||
826 (fi
->flags
& CEPH_F_SYNC
)) {
828 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
829 inode
, ceph_vinop(inode
), iocb
->ki_pos
, (unsigned)len
,
830 ceph_cap_string(got
));
832 if (ci
->i_inline_version
== CEPH_INLINE_NONE
) {
833 /* hmm, this isn't really async... */
834 ret
= ceph_sync_read(iocb
, to
, &retry_op
);
836 retry_op
= READ_INLINE
;
839 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
840 inode
, ceph_vinop(inode
), iocb
->ki_pos
, (unsigned)len
,
841 ceph_cap_string(got
));
843 ret
= generic_file_read_iter(iocb
, to
);
845 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
846 inode
, ceph_vinop(inode
), ceph_cap_string(got
), (int)ret
);
848 page_cache_release(pinned_page
);
851 ceph_put_cap_refs(ci
, got
);
852 if (retry_op
&& ret
>= 0) {
854 struct page
*page
= NULL
;
856 if (retry_op
== READ_INLINE
) {
857 page
= __page_cache_alloc(GFP_KERNEL
);
862 statret
= __ceph_do_getattr(inode
, page
,
863 CEPH_STAT_CAP_INLINE_DATA
, !!page
);
866 if (statret
== -ENODATA
) {
867 BUG_ON(retry_op
!= READ_INLINE
);
873 i_size
= i_size_read(inode
);
874 if (retry_op
== READ_INLINE
) {
875 BUG_ON(ret
> 0 || read
> 0);
876 if (iocb
->ki_pos
< i_size
&&
877 iocb
->ki_pos
< PAGE_CACHE_SIZE
) {
878 loff_t end
= min_t(loff_t
, i_size
,
880 end
= min_t(loff_t
, end
, PAGE_CACHE_SIZE
);
882 zero_user_segment(page
, statret
, end
);
883 ret
= copy_page_to_iter(page
,
884 iocb
->ki_pos
& ~PAGE_MASK
,
885 end
- iocb
->ki_pos
, to
);
889 if (iocb
->ki_pos
< i_size
&& read
< len
) {
890 size_t zlen
= min_t(size_t, len
- read
,
891 i_size
- iocb
->ki_pos
);
892 ret
= iov_iter_zero(zlen
, to
);
896 __free_pages(page
, 0);
900 /* hit EOF or hole? */
901 if (retry_op
== CHECK_EOF
&& iocb
->ki_pos
< i_size
&&
903 dout("sync_read hit hole, ppos %lld < size %lld"
904 ", reading more\n", iocb
->ki_pos
,
921 * Take cap references to avoid releasing caps to MDS mid-write.
923 * If we are synchronous, and write with an old snap context, the OSD
924 * may return EOLDSNAPC. In that case, retry the write.. _after_
925 * dropping our cap refs and allowing the pending snap to logically
926 * complete _before_ this write occurs.
928 * If we are near ENOSPC, write synchronously.
930 static ssize_t
ceph_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
)
932 struct file
*file
= iocb
->ki_filp
;
933 struct ceph_file_info
*fi
= file
->private_data
;
934 struct inode
*inode
= file_inode(file
);
935 struct ceph_inode_info
*ci
= ceph_inode(inode
);
936 struct ceph_osd_client
*osdc
=
937 &ceph_sb_to_client(inode
->i_sb
)->client
->osdc
;
938 struct ceph_cap_flush
*prealloc_cf
;
939 ssize_t count
, written
= 0;
943 if (ceph_snap(inode
) != CEPH_NOSNAP
)
946 prealloc_cf
= ceph_alloc_cap_flush();
950 mutex_lock(&inode
->i_mutex
);
952 /* We can write back this queue in page reclaim */
953 current
->backing_dev_info
= inode_to_bdi(inode
);
955 if (iocb
->ki_flags
& IOCB_APPEND
) {
956 err
= ceph_do_getattr(inode
, CEPH_STAT_CAP_SIZE
, false);
961 err
= generic_write_checks(iocb
, from
);
966 count
= iov_iter_count(from
);
967 err
= file_remove_privs(file
);
971 err
= file_update_time(file
);
975 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
976 err
= ceph_uninline_data(file
, NULL
);
982 if (ceph_osdmap_flag(osdc
->osdmap
, CEPH_OSDMAP_FULL
)) {
987 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
988 inode
, ceph_vinop(inode
), pos
, count
, inode
->i_size
);
989 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
990 want
= CEPH_CAP_FILE_BUFFER
| CEPH_CAP_FILE_LAZYIO
;
992 want
= CEPH_CAP_FILE_BUFFER
;
994 err
= ceph_get_caps(ci
, CEPH_CAP_FILE_WR
, want
, pos
+ count
,
999 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1000 inode
, ceph_vinop(inode
), pos
, count
, ceph_cap_string(got
));
1002 if ((got
& (CEPH_CAP_FILE_BUFFER
|CEPH_CAP_FILE_LAZYIO
)) == 0 ||
1003 (iocb
->ki_flags
& IOCB_DIRECT
) || (fi
->flags
& CEPH_F_SYNC
)) {
1004 struct ceph_snap_context
*snapc
;
1005 struct iov_iter data
;
1006 mutex_unlock(&inode
->i_mutex
);
1008 spin_lock(&ci
->i_ceph_lock
);
1009 if (__ceph_have_pending_cap_snap(ci
)) {
1010 struct ceph_cap_snap
*capsnap
=
1011 list_last_entry(&ci
->i_cap_snaps
,
1012 struct ceph_cap_snap
,
1014 snapc
= ceph_get_snap_context(capsnap
->context
);
1016 BUG_ON(!ci
->i_head_snapc
);
1017 snapc
= ceph_get_snap_context(ci
->i_head_snapc
);
1019 spin_unlock(&ci
->i_ceph_lock
);
1021 /* we might need to revert back to that point */
1023 if (iocb
->ki_flags
& IOCB_DIRECT
)
1024 written
= ceph_sync_direct_write(iocb
, &data
, pos
,
1027 written
= ceph_sync_write(iocb
, &data
, pos
, snapc
);
1028 if (written
== -EOLDSNAPC
) {
1029 dout("aio_write %p %llx.%llx %llu~%u"
1030 "got EOLDSNAPC, retrying\n",
1031 inode
, ceph_vinop(inode
),
1032 pos
, (unsigned)count
);
1033 mutex_lock(&inode
->i_mutex
);
1037 iov_iter_advance(from
, written
);
1038 ceph_put_snap_context(snapc
);
1040 loff_t old_size
= inode
->i_size
;
1042 * No need to acquire the i_truncate_mutex. Because
1043 * the MDS revokes Fwb caps before sending truncate
1044 * message to us. We can't get Fwb cap while there
1045 * are pending vmtruncate. So write and vmtruncate
1046 * can not run at the same time
1048 written
= generic_perform_write(file
, from
, pos
);
1049 if (likely(written
>= 0))
1050 iocb
->ki_pos
= pos
+ written
;
1051 if (inode
->i_size
> old_size
)
1052 ceph_fscache_update_objectsize(inode
);
1053 mutex_unlock(&inode
->i_mutex
);
1058 spin_lock(&ci
->i_ceph_lock
);
1059 ci
->i_inline_version
= CEPH_INLINE_NONE
;
1060 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
,
1062 spin_unlock(&ci
->i_ceph_lock
);
1064 __mark_inode_dirty(inode
, dirty
);
1067 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1068 inode
, ceph_vinop(inode
), pos
, (unsigned)count
,
1069 ceph_cap_string(got
));
1070 ceph_put_cap_refs(ci
, got
);
1073 ((file
->f_flags
& O_SYNC
) || IS_SYNC(file
->f_mapping
->host
) ||
1074 ceph_osdmap_flag(osdc
->osdmap
, CEPH_OSDMAP_NEARFULL
))) {
1075 err
= vfs_fsync_range(file
, pos
, pos
+ written
- 1, 1);
1083 mutex_unlock(&inode
->i_mutex
);
1085 ceph_free_cap_flush(prealloc_cf
);
1086 current
->backing_dev_info
= NULL
;
1087 return written
? written
: err
;
1091 * llseek. be sure to verify file size on SEEK_END.
1093 static loff_t
ceph_llseek(struct file
*file
, loff_t offset
, int whence
)
1095 struct inode
*inode
= file
->f_mapping
->host
;
1098 mutex_lock(&inode
->i_mutex
);
1100 if (whence
== SEEK_END
|| whence
== SEEK_DATA
|| whence
== SEEK_HOLE
) {
1101 ret
= ceph_do_getattr(inode
, CEPH_STAT_CAP_SIZE
, false);
1110 offset
+= inode
->i_size
;
1114 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1115 * position-querying operation. Avoid rewriting the "same"
1116 * f_pos value back to the file because a concurrent read(),
1117 * write() or lseek() might have altered it
1120 offset
= file
->f_pos
;
1123 offset
+= file
->f_pos
;
1126 if (offset
>= inode
->i_size
) {
1132 if (offset
>= inode
->i_size
) {
1136 offset
= inode
->i_size
;
1140 offset
= vfs_setpos(file
, offset
, inode
->i_sb
->s_maxbytes
);
1143 mutex_unlock(&inode
->i_mutex
);
1147 static inline void ceph_zero_partial_page(
1148 struct inode
*inode
, loff_t offset
, unsigned size
)
1151 pgoff_t index
= offset
>> PAGE_CACHE_SHIFT
;
1153 page
= find_lock_page(inode
->i_mapping
, index
);
1155 wait_on_page_writeback(page
);
1156 zero_user(page
, offset
& (PAGE_CACHE_SIZE
- 1), size
);
1158 page_cache_release(page
);
1162 static void ceph_zero_pagecache_range(struct inode
*inode
, loff_t offset
,
1165 loff_t nearly
= round_up(offset
, PAGE_CACHE_SIZE
);
1166 if (offset
< nearly
) {
1167 loff_t size
= nearly
- offset
;
1170 ceph_zero_partial_page(inode
, offset
, size
);
1174 if (length
>= PAGE_CACHE_SIZE
) {
1175 loff_t size
= round_down(length
, PAGE_CACHE_SIZE
);
1176 truncate_pagecache_range(inode
, offset
, offset
+ size
- 1);
1181 ceph_zero_partial_page(inode
, offset
, length
);
1184 static int ceph_zero_partial_object(struct inode
*inode
,
1185 loff_t offset
, loff_t
*length
)
1187 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1188 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
1189 struct ceph_osd_request
*req
;
1195 op
= offset
? CEPH_OSD_OP_DELETE
: CEPH_OSD_OP_TRUNCATE
;
1198 op
= CEPH_OSD_OP_ZERO
;
1201 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
1205 CEPH_OSD_FLAG_WRITE
|
1206 CEPH_OSD_FLAG_ONDISK
,
1213 ceph_osdc_build_request(req
, offset
, NULL
, ceph_vino(inode
).snap
,
1216 ret
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
1218 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
1222 ceph_osdc_put_request(req
);
1228 static int ceph_zero_objects(struct inode
*inode
, loff_t offset
, loff_t length
)
1231 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1232 s32 stripe_unit
= ceph_file_layout_su(ci
->i_layout
);
1233 s32 stripe_count
= ceph_file_layout_stripe_count(ci
->i_layout
);
1234 s32 object_size
= ceph_file_layout_object_size(ci
->i_layout
);
1235 u64 object_set_size
= object_size
* stripe_count
;
1238 /* round offset up to next period boundary */
1239 nearly
= offset
+ object_set_size
- 1;
1241 nearly
-= do_div(t
, object_set_size
);
1243 while (length
&& offset
< nearly
) {
1244 loff_t size
= length
;
1245 ret
= ceph_zero_partial_object(inode
, offset
, &size
);
1251 while (length
>= object_set_size
) {
1253 loff_t pos
= offset
;
1254 for (i
= 0; i
< stripe_count
; ++i
) {
1255 ret
= ceph_zero_partial_object(inode
, pos
, NULL
);
1260 offset
+= object_set_size
;
1261 length
-= object_set_size
;
1264 loff_t size
= length
;
1265 ret
= ceph_zero_partial_object(inode
, offset
, &size
);
1274 static long ceph_fallocate(struct file
*file
, int mode
,
1275 loff_t offset
, loff_t length
)
1277 struct ceph_file_info
*fi
= file
->private_data
;
1278 struct inode
*inode
= file_inode(file
);
1279 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1280 struct ceph_osd_client
*osdc
=
1281 &ceph_inode_to_client(inode
)->client
->osdc
;
1282 struct ceph_cap_flush
*prealloc_cf
;
1289 if (mode
& ~(FALLOC_FL_KEEP_SIZE
| FALLOC_FL_PUNCH_HOLE
))
1292 if (!S_ISREG(inode
->i_mode
))
1295 prealloc_cf
= ceph_alloc_cap_flush();
1299 mutex_lock(&inode
->i_mutex
);
1301 if (ceph_snap(inode
) != CEPH_NOSNAP
) {
1306 if (ceph_osdmap_flag(osdc
->osdmap
, CEPH_OSDMAP_FULL
) &&
1307 !(mode
& FALLOC_FL_PUNCH_HOLE
)) {
1312 if (ci
->i_inline_version
!= CEPH_INLINE_NONE
) {
1313 ret
= ceph_uninline_data(file
, NULL
);
1318 size
= i_size_read(inode
);
1319 if (!(mode
& FALLOC_FL_KEEP_SIZE
))
1320 endoff
= offset
+ length
;
1322 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1323 want
= CEPH_CAP_FILE_BUFFER
| CEPH_CAP_FILE_LAZYIO
;
1325 want
= CEPH_CAP_FILE_BUFFER
;
1327 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_WR
, want
, endoff
, &got
, NULL
);
1331 if (mode
& FALLOC_FL_PUNCH_HOLE
) {
1333 ceph_zero_pagecache_range(inode
, offset
, length
);
1334 ret
= ceph_zero_objects(inode
, offset
, length
);
1335 } else if (endoff
> size
) {
1336 truncate_pagecache_range(inode
, size
, -1);
1337 if (ceph_inode_set_size(inode
, endoff
))
1338 ceph_check_caps(ceph_inode(inode
),
1339 CHECK_CAPS_AUTHONLY
, NULL
);
1343 spin_lock(&ci
->i_ceph_lock
);
1344 ci
->i_inline_version
= CEPH_INLINE_NONE
;
1345 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
,
1347 spin_unlock(&ci
->i_ceph_lock
);
1349 __mark_inode_dirty(inode
, dirty
);
1352 ceph_put_cap_refs(ci
, got
);
1354 mutex_unlock(&inode
->i_mutex
);
1355 ceph_free_cap_flush(prealloc_cf
);
1359 const struct file_operations ceph_file_fops
= {
1361 .release
= ceph_release
,
1362 .llseek
= ceph_llseek
,
1363 .read_iter
= ceph_read_iter
,
1364 .write_iter
= ceph_write_iter
,
1366 .fsync
= ceph_fsync
,
1368 .flock
= ceph_flock
,
1369 .splice_read
= generic_file_splice_read
,
1370 .splice_write
= iter_file_splice_write
,
1371 .unlocked_ioctl
= ceph_ioctl
,
1372 .compat_ioctl
= ceph_ioctl
,
1373 .fallocate
= ceph_fallocate
,