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/aio.h>
11 #include <linux/falloc.h>
14 #include "mds_client.h"
18 * Ceph file operations
20 * Implement basic open/close functionality, and implement
23 * We implement three modes of file I/O:
24 * - buffered uses the generic_file_aio_{read,write} helpers
26 * - synchronous is used when there is multi-client read/write
27 * sharing, avoids the page cache, and synchronously waits for an
30 * - direct io takes the variant of the sync path that references
31 * user pages directly.
33 * fsync() flushes and waits on dirty pages, but just queues metadata
34 * for writeback: since the MDS can recover size and mtime there is no
35 * need to wait for MDS acknowledgement.
40 * Prepare an open request. Preallocate ceph_cap to avoid an
41 * inopportune ENOMEM later.
43 static struct ceph_mds_request
*
44 prepare_open_request(struct super_block
*sb
, int flags
, int create_mode
)
46 struct ceph_fs_client
*fsc
= ceph_sb_to_client(sb
);
47 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
48 struct ceph_mds_request
*req
;
49 int want_auth
= USE_ANY_MDS
;
50 int op
= (flags
& O_CREAT
) ? CEPH_MDS_OP_CREATE
: CEPH_MDS_OP_OPEN
;
52 if (flags
& (O_WRONLY
|O_RDWR
|O_CREAT
|O_TRUNC
))
53 want_auth
= USE_AUTH_MDS
;
55 req
= ceph_mdsc_create_request(mdsc
, op
, want_auth
);
58 req
->r_fmode
= ceph_flags_to_mode(flags
);
59 req
->r_args
.open
.flags
= cpu_to_le32(flags
);
60 req
->r_args
.open
.mode
= cpu_to_le32(create_mode
);
66 * initialize private struct file data.
67 * if we fail, clean up by dropping fmode reference on the ceph_inode
69 static int ceph_init_file(struct inode
*inode
, struct file
*file
, int fmode
)
71 struct ceph_file_info
*cf
;
73 struct ceph_inode_info
*ci
= ceph_inode(inode
);
74 struct ceph_fs_client
*fsc
= ceph_sb_to_client(inode
->i_sb
);
75 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
77 switch (inode
->i_mode
& S_IFMT
) {
79 /* First file open request creates the cookie, we want to keep
80 * this cookie around for the filetime of the inode as not to
81 * have to worry about fscache register / revoke / operation
84 * Also, if we know the operation is going to invalidate data
85 * (non readonly) just nuke the cache right away.
87 ceph_fscache_register_inode_cookie(mdsc
->fsc
, ci
);
88 if ((fmode
& CEPH_FILE_MODE_WR
))
89 ceph_fscache_invalidate(inode
);
91 dout("init_file %p %p 0%o (regular)\n", inode
, file
,
93 cf
= kmem_cache_alloc(ceph_file_cachep
, GFP_NOFS
| __GFP_ZERO
);
95 ceph_put_fmode(ceph_inode(inode
), fmode
); /* clean up */
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
;
139 struct inode
*parent_inode
= NULL
;
141 int flags
, fmode
, wanted
;
144 dout("open file %p is already opened\n", file
);
148 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
149 flags
= file
->f_flags
& ~(O_CREAT
|O_EXCL
);
150 if (S_ISDIR(inode
->i_mode
))
151 flags
= O_DIRECTORY
; /* mds likes to know */
153 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode
,
154 ceph_vinop(inode
), file
, flags
, file
->f_flags
);
155 fmode
= ceph_flags_to_mode(flags
);
156 wanted
= ceph_caps_for_mode(fmode
);
158 /* snapped files are read-only */
159 if (ceph_snap(inode
) != CEPH_NOSNAP
&& (file
->f_mode
& FMODE_WRITE
))
162 /* trivially open snapdir */
163 if (ceph_snap(inode
) == CEPH_SNAPDIR
) {
164 spin_lock(&ci
->i_ceph_lock
);
165 __ceph_get_fmode(ci
, fmode
);
166 spin_unlock(&ci
->i_ceph_lock
);
167 return ceph_init_file(inode
, file
, fmode
);
171 * No need to block if we have caps on the auth MDS (for
172 * write) or any MDS (for read). Update wanted set
175 spin_lock(&ci
->i_ceph_lock
);
176 if (__ceph_is_any_real_caps(ci
) &&
177 (((fmode
& CEPH_FILE_MODE_WR
) == 0) || ci
->i_auth_cap
)) {
178 int mds_wanted
= __ceph_caps_mds_wanted(ci
);
179 int issued
= __ceph_caps_issued(ci
, NULL
);
181 dout("open %p fmode %d want %s issued %s using existing\n",
182 inode
, fmode
, ceph_cap_string(wanted
),
183 ceph_cap_string(issued
));
184 __ceph_get_fmode(ci
, fmode
);
185 spin_unlock(&ci
->i_ceph_lock
);
188 if ((issued
& wanted
) != wanted
&&
189 (mds_wanted
& wanted
) != wanted
&&
190 ceph_snap(inode
) != CEPH_SNAPDIR
)
191 ceph_check_caps(ci
, 0, NULL
);
193 return ceph_init_file(inode
, file
, fmode
);
194 } else if (ceph_snap(inode
) != CEPH_NOSNAP
&&
195 (ci
->i_snap_caps
& wanted
) == wanted
) {
196 __ceph_get_fmode(ci
, fmode
);
197 spin_unlock(&ci
->i_ceph_lock
);
198 return ceph_init_file(inode
, file
, fmode
);
201 spin_unlock(&ci
->i_ceph_lock
);
203 dout("open fmode %d wants %s\n", fmode
, ceph_cap_string(wanted
));
204 req
= prepare_open_request(inode
->i_sb
, flags
, 0);
209 req
->r_inode
= inode
;
213 if (flags
& (O_CREAT
|O_TRUNC
))
214 parent_inode
= ceph_get_dentry_parent_inode(file
->f_dentry
);
215 err
= ceph_mdsc_do_request(mdsc
, parent_inode
, req
);
218 err
= ceph_init_file(inode
, file
, req
->r_fmode
);
219 ceph_mdsc_put_request(req
);
220 dout("open result=%d on %llx.%llx\n", err
, ceph_vinop(inode
));
227 * Do a lookup + open with a single request. If we get a non-existent
228 * file or symlink, return 1 so the VFS can retry.
230 int ceph_atomic_open(struct inode
*dir
, struct dentry
*dentry
,
231 struct file
*file
, unsigned flags
, umode_t mode
,
234 struct ceph_fs_client
*fsc
= ceph_sb_to_client(dir
->i_sb
);
235 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
236 struct ceph_mds_request
*req
;
240 dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
241 dir
, dentry
, dentry
->d_name
.len
, dentry
->d_name
.name
,
242 d_unhashed(dentry
) ? "unhashed" : "hashed", flags
, mode
);
244 if (dentry
->d_name
.len
> NAME_MAX
)
245 return -ENAMETOOLONG
;
247 err
= ceph_init_dentry(dentry
);
252 req
= prepare_open_request(dir
->i_sb
, flags
, mode
);
255 req
->r_dentry
= dget(dentry
);
257 if (flags
& O_CREAT
) {
258 req
->r_dentry_drop
= CEPH_CAP_FILE_SHARED
;
259 req
->r_dentry_unless
= CEPH_CAP_FILE_EXCL
;
261 req
->r_locked_dir
= dir
; /* caller holds dir->i_mutex */
262 err
= ceph_mdsc_do_request(mdsc
,
263 (flags
& (O_CREAT
|O_TRUNC
)) ? dir
: NULL
,
268 err
= ceph_handle_snapdir(req
, dentry
, err
);
269 if (err
== 0 && (flags
& O_CREAT
) && !req
->r_reply_info
.head
->is_dentry
)
270 err
= ceph_handle_notrace_create(dir
, dentry
);
272 if (d_unhashed(dentry
)) {
273 dn
= ceph_finish_lookup(req
, dentry
, err
);
277 /* we were given a hashed negative dentry */
282 if (dn
|| dentry
->d_inode
== NULL
|| S_ISLNK(dentry
->d_inode
->i_mode
)) {
283 /* make vfs retry on splice, ENOENT, or symlink */
284 dout("atomic_open finish_no_open on dn %p\n", dn
);
285 err
= finish_no_open(file
, dn
);
287 dout("atomic_open finish_open on dn %p\n", dn
);
288 if (req
->r_op
== CEPH_MDS_OP_CREATE
&& req
->r_reply_info
.has_create_ino
) {
289 *opened
|= FILE_CREATED
;
291 err
= finish_open(file
, dentry
, ceph_open
, opened
);
295 ceph_mdsc_put_request(req
);
296 dout("atomic_open result=%d\n", err
);
300 int ceph_release(struct inode
*inode
, struct file
*file
)
302 struct ceph_inode_info
*ci
= ceph_inode(inode
);
303 struct ceph_file_info
*cf
= file
->private_data
;
305 dout("release inode %p file %p\n", inode
, file
);
306 ceph_put_fmode(ci
, cf
->fmode
);
307 if (cf
->last_readdir
)
308 ceph_mdsc_put_request(cf
->last_readdir
);
309 kfree(cf
->last_name
);
312 kmem_cache_free(ceph_file_cachep
, cf
);
314 /* wake up anyone waiting for caps on this inode */
315 wake_up_all(&ci
->i_cap_wq
);
320 * Read a range of bytes striped over one or more objects. Iterate over
321 * objects we stripe over. (That's not atomic, but good enough for now.)
323 * If we get a short result from the OSD, check against i_size; we need to
324 * only return a short read to the caller if we hit EOF.
326 static int striped_read(struct inode
*inode
,
328 struct page
**pages
, int num_pages
,
329 int *checkeof
, bool o_direct
,
330 unsigned long buf_align
)
332 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
333 struct ceph_inode_info
*ci
= ceph_inode(inode
);
334 u64 pos
, this_len
, left
;
335 int io_align
, page_align
;
338 struct page
**page_pos
;
340 bool hit_stripe
, was_short
;
343 * we may need to do multiple reads. not atomic, unfortunately.
348 pages_left
= num_pages
;
350 io_align
= off
& ~PAGE_MASK
;
354 page_align
= (pos
- io_align
+ buf_align
) & ~PAGE_MASK
;
356 page_align
= pos
& ~PAGE_MASK
;
358 ret
= ceph_osdc_readpages(&fsc
->client
->osdc
, ceph_vino(inode
),
359 &ci
->i_layout
, pos
, &this_len
,
362 page_pos
, pages_left
, page_align
);
365 hit_stripe
= this_len
< left
;
366 was_short
= ret
>= 0 && ret
< this_len
;
367 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos
, left
, read
,
368 ret
, hit_stripe
? " HITSTRIPE" : "", was_short
? " SHORT" : "");
372 if (was_short
&& (pos
+ ret
< inode
->i_size
)) {
373 u64 tmp
= min(this_len
- ret
,
374 inode
->i_size
- pos
- ret
);
375 dout(" zero gap %llu to %llu\n",
376 pos
+ ret
, pos
+ ret
+ tmp
);
377 ceph_zero_page_vector_range(page_align
+ read
+ ret
,
382 didpages
= (page_align
+ ret
) >> PAGE_CACHE_SHIFT
;
386 page_pos
+= didpages
;
387 pages_left
-= didpages
;
389 /* hit stripe and need continue*/
390 if (left
&& hit_stripe
&& pos
< inode
->i_size
)
396 /* did we bounce off eof? */
397 if (pos
+ left
> inode
->i_size
)
401 dout("striped_read returns %d\n", ret
);
406 * Completely synchronous read and write methods. Direct from __user
407 * buffer to osd, or directly to user pages (if O_DIRECT).
409 * If the read spans object boundary, just do multiple reads.
411 static ssize_t
ceph_sync_read(struct kiocb
*iocb
, struct iov_iter
*i
,
414 struct file
*file
= iocb
->ki_filp
;
415 struct inode
*inode
= file_inode(file
);
417 u64 off
= iocb
->ki_pos
;
419 size_t len
= i
->count
;
421 dout("sync_read on file %p %llu~%u %s\n", file
, off
,
423 (file
->f_flags
& O_DIRECT
) ? "O_DIRECT" : "");
425 * flush any page cache pages in this range. this
426 * will make concurrent normal and sync io slow,
427 * but it will at least behave sensibly when they are
430 ret
= filemap_write_and_wait_range(inode
->i_mapping
, off
,
435 if (file
->f_flags
& O_DIRECT
) {
436 while (iov_iter_count(i
)) {
437 void __user
*data
= i
->iov
[0].iov_base
+ i
->iov_offset
;
438 size_t len
= i
->iov
[0].iov_len
- i
->iov_offset
;
440 num_pages
= calc_pages_for((unsigned long)data
, len
);
441 pages
= ceph_get_direct_page_vector(data
,
444 return PTR_ERR(pages
);
446 ret
= striped_read(inode
, off
, len
,
447 pages
, num_pages
, checkeof
,
448 1, (unsigned long)data
& ~PAGE_MASK
);
449 ceph_put_page_vector(pages
, num_pages
, true);
454 iov_iter_advance(i
, ret
);
459 num_pages
= calc_pages_for(off
, len
);
460 pages
= ceph_alloc_page_vector(num_pages
, GFP_NOFS
);
462 return PTR_ERR(pages
);
463 ret
= striped_read(inode
, off
, len
, pages
,
464 num_pages
, checkeof
, 0, 0);
467 size_t left
= len
= ret
;
470 void __user
*data
= i
->iov
[0].iov_base
472 l
= min(i
->iov
[0].iov_len
- i
->iov_offset
,
475 ret
= ceph_copy_page_vector_to_user(&pages
[k
],
479 iov_iter_advance(i
, ret
);
482 k
= calc_pages_for(iocb
->ki_pos
,
484 BUG_ON(k
>= num_pages
&& left
);
489 ceph_release_page_vector(pages
, num_pages
);
492 if (off
> iocb
->ki_pos
) {
493 ret
= off
- iocb
->ki_pos
;
497 dout("sync_read result %d\n", ret
);
502 * Write commit request unsafe callback, called to tell us when a
503 * request is unsafe (that is, in flight--has been handed to the
504 * messenger to send to its target osd). It is called again when
505 * we've received a response message indicating the request is
506 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
507 * is completed early (and unsuccessfully) due to a timeout or
510 * This is used if we requested both an ACK and ONDISK commit reply
513 static void ceph_sync_write_unsafe(struct ceph_osd_request
*req
, bool unsafe
)
515 struct ceph_inode_info
*ci
= ceph_inode(req
->r_inode
);
517 dout("%s %p tid %llu %ssafe\n", __func__
, req
, req
->r_tid
,
520 ceph_get_cap_refs(ci
, CEPH_CAP_FILE_WR
);
521 spin_lock(&ci
->i_unsafe_lock
);
522 list_add_tail(&req
->r_unsafe_item
,
523 &ci
->i_unsafe_writes
);
524 spin_unlock(&ci
->i_unsafe_lock
);
526 spin_lock(&ci
->i_unsafe_lock
);
527 list_del_init(&req
->r_unsafe_item
);
528 spin_unlock(&ci
->i_unsafe_lock
);
529 ceph_put_cap_refs(ci
, CEPH_CAP_FILE_WR
);
535 * Synchronous write, straight from __user pointer or user pages.
537 * If write spans object boundary, just do multiple writes. (For a
538 * correct atomic write, we should e.g. take write locks on all
539 * objects, rollback on failure, etc.)
542 ceph_sync_direct_write(struct kiocb
*iocb
, const struct iovec
*iov
,
543 unsigned long nr_segs
, size_t count
)
545 struct file
*file
= iocb
->ki_filp
;
546 struct inode
*inode
= file_inode(file
);
547 struct ceph_inode_info
*ci
= ceph_inode(inode
);
548 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
549 struct ceph_snap_context
*snapc
;
550 struct ceph_vino vino
;
551 struct ceph_osd_request
*req
;
559 struct timespec mtime
= CURRENT_TIME
;
560 loff_t pos
= iocb
->ki_pos
;
563 if (ceph_snap(file_inode(file
)) != CEPH_NOSNAP
)
566 dout("sync_direct_write on file %p %lld~%u\n", file
, pos
,
569 ret
= filemap_write_and_wait_range(inode
->i_mapping
, pos
, pos
+ count
);
573 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
574 pos
>> PAGE_CACHE_SHIFT
,
575 (pos
+ count
) >> PAGE_CACHE_SHIFT
);
577 dout("invalidate_inode_pages2_range returned %d\n", ret
);
579 flags
= CEPH_OSD_FLAG_ORDERSNAP
|
580 CEPH_OSD_FLAG_ONDISK
|
583 iov_iter_init(&i
, iov
, nr_segs
, count
, 0);
585 while (iov_iter_count(&i
) > 0) {
586 void __user
*data
= i
.iov
->iov_base
+ i
.iov_offset
;
587 u64 len
= i
.iov
->iov_len
- i
.iov_offset
;
589 page_align
= (unsigned long)data
& ~PAGE_MASK
;
591 snapc
= ci
->i_snap_realm
->cached_context
;
592 vino
= ceph_vino(inode
);
593 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
595 2,/*include a 'startsync' command*/
596 CEPH_OSD_OP_WRITE
, flags
, snapc
,
605 num_pages
= calc_pages_for(page_align
, len
);
606 pages
= ceph_get_direct_page_vector(data
, num_pages
, false);
608 ret
= PTR_ERR(pages
);
613 * throw out any page cache pages in this range. this
616 truncate_inode_pages_range(inode
->i_mapping
, pos
,
617 (pos
+len
) | (PAGE_CACHE_SIZE
-1));
618 osd_req_op_extent_osd_data_pages(req
, 0, pages
, len
, page_align
,
621 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
622 ceph_osdc_build_request(req
, pos
, snapc
, vino
.snap
, &mtime
);
624 ret
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
626 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
628 ceph_put_page_vector(pages
, num_pages
, false);
631 ceph_osdc_put_request(req
);
635 iov_iter_advance(&i
, (size_t)len
);
637 if (pos
> i_size_read(inode
)) {
638 check_caps
= ceph_inode_set_size(inode
, pos
);
640 ceph_check_caps(ceph_inode(inode
),
648 if (ret
!= -EOLDSNAPC
&& written
> 0) {
657 * Synchronous write, straight from __user pointer or user pages.
659 * If write spans object boundary, just do multiple writes. (For a
660 * correct atomic write, we should e.g. take write locks on all
661 * objects, rollback on failure, etc.)
663 static ssize_t
ceph_sync_write(struct kiocb
*iocb
, const struct iovec
*iov
,
664 unsigned long nr_segs
, size_t count
)
666 struct file
*file
= iocb
->ki_filp
;
667 struct inode
*inode
= file_inode(file
);
668 struct ceph_inode_info
*ci
= ceph_inode(inode
);
669 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
670 struct ceph_snap_context
*snapc
;
671 struct ceph_vino vino
;
672 struct ceph_osd_request
*req
;
680 struct timespec mtime
= CURRENT_TIME
;
681 loff_t pos
= iocb
->ki_pos
;
684 if (ceph_snap(file_inode(file
)) != CEPH_NOSNAP
)
687 dout("sync_write on file %p %lld~%u\n", file
, pos
, (unsigned)count
);
689 ret
= filemap_write_and_wait_range(inode
->i_mapping
, pos
, pos
+ count
);
693 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
694 pos
>> PAGE_CACHE_SHIFT
,
695 (pos
+ count
) >> PAGE_CACHE_SHIFT
);
697 dout("invalidate_inode_pages2_range returned %d\n", ret
);
699 flags
= CEPH_OSD_FLAG_ORDERSNAP
|
700 CEPH_OSD_FLAG_ONDISK
|
701 CEPH_OSD_FLAG_WRITE
|
704 iov_iter_init(&i
, iov
, nr_segs
, count
, 0);
706 while ((len
= iov_iter_count(&i
)) > 0) {
710 snapc
= ci
->i_snap_realm
->cached_context
;
711 vino
= ceph_vino(inode
);
712 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
714 CEPH_OSD_OP_WRITE
, flags
, snapc
,
724 * write from beginning of first page,
725 * regardless of io alignment
727 num_pages
= (len
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
729 pages
= ceph_alloc_page_vector(num_pages
, GFP_NOFS
);
731 ret
= PTR_ERR(pages
);
736 for (n
= 0; n
< num_pages
; n
++) {
737 size_t plen
= min_t(size_t, left
, PAGE_SIZE
);
738 ret
= iov_iter_copy_from_user(pages
[n
], &i
, 0, plen
);
744 iov_iter_advance(&i
, ret
);
748 ceph_release_page_vector(pages
, num_pages
);
752 /* get a second commit callback */
753 req
->r_unsafe_callback
= ceph_sync_write_unsafe
;
754 req
->r_inode
= inode
;
756 osd_req_op_extent_osd_data_pages(req
, 0, pages
, len
, 0,
759 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
760 ceph_osdc_build_request(req
, pos
, snapc
, vino
.snap
, &mtime
);
762 ret
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
764 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
767 ceph_osdc_put_request(req
);
772 if (pos
> i_size_read(inode
)) {
773 check_caps
= ceph_inode_set_size(inode
, pos
);
775 ceph_check_caps(ceph_inode(inode
),
783 if (ret
!= -EOLDSNAPC
&& written
> 0) {
791 * Wrap generic_file_aio_read with checks for cap bits on the inode.
792 * Atomically grab references, so that those bits are not released
793 * back to the MDS mid-read.
795 * Hmm, the sync read case isn't actually async... should it be?
797 static ssize_t
ceph_aio_read(struct kiocb
*iocb
, const struct iovec
*iov
,
798 unsigned long nr_segs
, loff_t pos
)
800 struct file
*filp
= iocb
->ki_filp
;
801 struct ceph_file_info
*fi
= filp
->private_data
;
802 size_t len
= iocb
->ki_nbytes
;
803 struct inode
*inode
= file_inode(filp
);
804 struct ceph_inode_info
*ci
= ceph_inode(inode
);
807 int checkeof
= 0, read
= 0;
810 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
811 inode
, ceph_vinop(inode
), iocb
->ki_pos
, (unsigned)len
, inode
);
813 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
814 want
= CEPH_CAP_FILE_CACHE
| CEPH_CAP_FILE_LAZYIO
;
816 want
= CEPH_CAP_FILE_CACHE
;
817 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_RD
, want
, &got
, -1);
821 if ((got
& (CEPH_CAP_FILE_CACHE
|CEPH_CAP_FILE_LAZYIO
)) == 0 ||
822 (iocb
->ki_filp
->f_flags
& O_DIRECT
) ||
823 (fi
->flags
& CEPH_F_SYNC
)) {
826 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
827 inode
, ceph_vinop(inode
), iocb
->ki_pos
, (unsigned)len
,
828 ceph_cap_string(got
));
831 ret
= generic_segment_checks(iov
, &nr_segs
,
837 iov_iter_init(&i
, iov
, nr_segs
, len
, read
);
839 /* hmm, this isn't really async... */
840 ret
= ceph_sync_read(iocb
, &i
, &checkeof
);
843 * We can't modify the content of iov,
844 * so we only read from beginning.
848 len
= iocb
->ki_nbytes
;
851 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
852 inode
, ceph_vinop(inode
), pos
, (unsigned)len
,
853 ceph_cap_string(got
));
855 ret
= generic_file_aio_read(iocb
, iov
, nr_segs
, pos
);
858 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
859 inode
, ceph_vinop(inode
), ceph_cap_string(got
), (int)ret
);
860 ceph_put_cap_refs(ci
, got
);
862 if (checkeof
&& ret
>= 0) {
863 int statret
= ceph_do_getattr(inode
,
866 /* hit EOF or hole? */
867 if (statret
== 0 && iocb
->ki_pos
< inode
->i_size
&&
869 dout("sync_read hit hole, ppos %lld < size %lld"
870 ", reading more\n", iocb
->ki_pos
,
887 * Take cap references to avoid releasing caps to MDS mid-write.
889 * If we are synchronous, and write with an old snap context, the OSD
890 * may return EOLDSNAPC. In that case, retry the write.. _after_
891 * dropping our cap refs and allowing the pending snap to logically
892 * complete _before_ this write occurs.
894 * If we are near ENOSPC, write synchronously.
896 static ssize_t
ceph_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
897 unsigned long nr_segs
, loff_t pos
)
899 struct file
*file
= iocb
->ki_filp
;
900 struct ceph_file_info
*fi
= file
->private_data
;
901 struct inode
*inode
= file_inode(file
);
902 struct ceph_inode_info
*ci
= ceph_inode(inode
);
903 struct ceph_osd_client
*osdc
=
904 &ceph_sb_to_client(inode
->i_sb
)->client
->osdc
;
905 ssize_t count
, written
= 0;
908 if (ceph_snap(inode
) != CEPH_NOSNAP
)
911 mutex_lock(&inode
->i_mutex
);
913 err
= generic_segment_checks(iov
, &nr_segs
, &count
, VERIFY_READ
);
917 /* We can write back this queue in page reclaim */
918 current
->backing_dev_info
= file
->f_mapping
->backing_dev_info
;
920 err
= generic_write_checks(file
, &pos
, &count
, S_ISBLK(inode
->i_mode
));
927 err
= file_remove_suid(file
);
931 err
= file_update_time(file
);
936 if (ceph_osdmap_flag(osdc
->osdmap
, CEPH_OSDMAP_FULL
)) {
941 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
942 inode
, ceph_vinop(inode
), pos
, count
, inode
->i_size
);
943 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
944 want
= CEPH_CAP_FILE_BUFFER
| CEPH_CAP_FILE_LAZYIO
;
946 want
= CEPH_CAP_FILE_BUFFER
;
948 err
= ceph_get_caps(ci
, CEPH_CAP_FILE_WR
, want
, &got
, pos
+ count
);
952 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
953 inode
, ceph_vinop(inode
), pos
, count
, ceph_cap_string(got
));
955 if ((got
& (CEPH_CAP_FILE_BUFFER
|CEPH_CAP_FILE_LAZYIO
)) == 0 ||
956 (file
->f_flags
& O_DIRECT
) || (fi
->flags
& CEPH_F_SYNC
)) {
957 mutex_unlock(&inode
->i_mutex
);
958 if (file
->f_flags
& O_DIRECT
)
959 written
= ceph_sync_direct_write(iocb
, iov
,
962 written
= ceph_sync_write(iocb
, iov
, nr_segs
, count
);
963 if (written
== -EOLDSNAPC
) {
964 dout("aio_write %p %llx.%llx %llu~%u"
965 "got EOLDSNAPC, retrying\n",
966 inode
, ceph_vinop(inode
),
967 pos
, (unsigned)iov
->iov_len
);
968 mutex_lock(&inode
->i_mutex
);
973 * No need to acquire the i_truncate_mutex. Because
974 * the MDS revokes Fwb caps before sending truncate
975 * message to us. We can't get Fwb cap while there
976 * are pending vmtruncate. So write and vmtruncate
977 * can not run at the same time
979 written
= generic_file_buffered_write(iocb
, iov
, nr_segs
,
982 mutex_unlock(&inode
->i_mutex
);
987 spin_lock(&ci
->i_ceph_lock
);
988 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
);
989 spin_unlock(&ci
->i_ceph_lock
);
991 __mark_inode_dirty(inode
, dirty
);
994 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
995 inode
, ceph_vinop(inode
), pos
, (unsigned)iov
->iov_len
,
996 ceph_cap_string(got
));
997 ceph_put_cap_refs(ci
, got
);
1000 ((file
->f_flags
& O_SYNC
) || IS_SYNC(file
->f_mapping
->host
) ||
1001 ceph_osdmap_flag(osdc
->osdmap
, CEPH_OSDMAP_NEARFULL
))) {
1002 err
= vfs_fsync_range(file
, pos
, pos
+ written
- 1, 1);
1010 mutex_unlock(&inode
->i_mutex
);
1012 current
->backing_dev_info
= NULL
;
1013 return written
? written
: err
;
1017 * llseek. be sure to verify file size on SEEK_END.
1019 static loff_t
ceph_llseek(struct file
*file
, loff_t offset
, int whence
)
1021 struct inode
*inode
= file
->f_mapping
->host
;
1024 mutex_lock(&inode
->i_mutex
);
1026 if (whence
== SEEK_END
|| whence
== SEEK_DATA
|| whence
== SEEK_HOLE
) {
1027 ret
= ceph_do_getattr(inode
, CEPH_STAT_CAP_SIZE
);
1036 offset
+= inode
->i_size
;
1040 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1041 * position-querying operation. Avoid rewriting the "same"
1042 * f_pos value back to the file because a concurrent read(),
1043 * write() or lseek() might have altered it
1046 offset
= file
->f_pos
;
1049 offset
+= file
->f_pos
;
1052 if (offset
>= inode
->i_size
) {
1058 if (offset
>= inode
->i_size
) {
1062 offset
= inode
->i_size
;
1066 offset
= vfs_setpos(file
, offset
, inode
->i_sb
->s_maxbytes
);
1069 mutex_unlock(&inode
->i_mutex
);
1073 static inline void ceph_zero_partial_page(
1074 struct inode
*inode
, loff_t offset
, unsigned size
)
1077 pgoff_t index
= offset
>> PAGE_CACHE_SHIFT
;
1079 page
= find_lock_page(inode
->i_mapping
, index
);
1081 wait_on_page_writeback(page
);
1082 zero_user(page
, offset
& (PAGE_CACHE_SIZE
- 1), size
);
1084 page_cache_release(page
);
1088 static void ceph_zero_pagecache_range(struct inode
*inode
, loff_t offset
,
1091 loff_t nearly
= round_up(offset
, PAGE_CACHE_SIZE
);
1092 if (offset
< nearly
) {
1093 loff_t size
= nearly
- offset
;
1096 ceph_zero_partial_page(inode
, offset
, size
);
1100 if (length
>= PAGE_CACHE_SIZE
) {
1101 loff_t size
= round_down(length
, PAGE_CACHE_SIZE
);
1102 truncate_pagecache_range(inode
, offset
, offset
+ size
- 1);
1107 ceph_zero_partial_page(inode
, offset
, length
);
1110 static int ceph_zero_partial_object(struct inode
*inode
,
1111 loff_t offset
, loff_t
*length
)
1113 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1114 struct ceph_fs_client
*fsc
= ceph_inode_to_client(inode
);
1115 struct ceph_osd_request
*req
;
1121 op
= offset
? CEPH_OSD_OP_DELETE
: CEPH_OSD_OP_TRUNCATE
;
1124 op
= CEPH_OSD_OP_ZERO
;
1127 req
= ceph_osdc_new_request(&fsc
->client
->osdc
, &ci
->i_layout
,
1131 CEPH_OSD_FLAG_WRITE
|
1132 CEPH_OSD_FLAG_ONDISK
,
1139 ceph_osdc_build_request(req
, offset
, NULL
, ceph_vino(inode
).snap
,
1142 ret
= ceph_osdc_start_request(&fsc
->client
->osdc
, req
, false);
1144 ret
= ceph_osdc_wait_request(&fsc
->client
->osdc
, req
);
1148 ceph_osdc_put_request(req
);
1154 static int ceph_zero_objects(struct inode
*inode
, loff_t offset
, loff_t length
)
1157 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1158 s32 stripe_unit
= ceph_file_layout_su(ci
->i_layout
);
1159 s32 stripe_count
= ceph_file_layout_stripe_count(ci
->i_layout
);
1160 s32 object_size
= ceph_file_layout_object_size(ci
->i_layout
);
1161 u64 object_set_size
= object_size
* stripe_count
;
1164 /* round offset up to next period boundary */
1165 nearly
= offset
+ object_set_size
- 1;
1167 nearly
-= do_div(t
, object_set_size
);
1169 while (length
&& offset
< nearly
) {
1170 loff_t size
= length
;
1171 ret
= ceph_zero_partial_object(inode
, offset
, &size
);
1177 while (length
>= object_set_size
) {
1179 loff_t pos
= offset
;
1180 for (i
= 0; i
< stripe_count
; ++i
) {
1181 ret
= ceph_zero_partial_object(inode
, pos
, NULL
);
1186 offset
+= object_set_size
;
1187 length
-= object_set_size
;
1190 loff_t size
= length
;
1191 ret
= ceph_zero_partial_object(inode
, offset
, &size
);
1200 static long ceph_fallocate(struct file
*file
, int mode
,
1201 loff_t offset
, loff_t length
)
1203 struct ceph_file_info
*fi
= file
->private_data
;
1204 struct inode
*inode
= file_inode(file
);
1205 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1206 struct ceph_osd_client
*osdc
=
1207 &ceph_inode_to_client(inode
)->client
->osdc
;
1214 if (!S_ISREG(inode
->i_mode
))
1217 if (IS_SWAPFILE(inode
))
1220 mutex_lock(&inode
->i_mutex
);
1222 if (ceph_snap(inode
) != CEPH_NOSNAP
) {
1227 if (ceph_osdmap_flag(osdc
->osdmap
, CEPH_OSDMAP_FULL
) &&
1228 !(mode
& FALLOC_FL_PUNCH_HOLE
)) {
1233 size
= i_size_read(inode
);
1234 if (!(mode
& FALLOC_FL_KEEP_SIZE
))
1235 endoff
= offset
+ length
;
1237 if (fi
->fmode
& CEPH_FILE_MODE_LAZY
)
1238 want
= CEPH_CAP_FILE_BUFFER
| CEPH_CAP_FILE_LAZYIO
;
1240 want
= CEPH_CAP_FILE_BUFFER
;
1242 ret
= ceph_get_caps(ci
, CEPH_CAP_FILE_WR
, want
, &got
, endoff
);
1246 if (mode
& FALLOC_FL_PUNCH_HOLE
) {
1248 ceph_zero_pagecache_range(inode
, offset
, length
);
1249 ret
= ceph_zero_objects(inode
, offset
, length
);
1250 } else if (endoff
> size
) {
1251 truncate_pagecache_range(inode
, size
, -1);
1252 if (ceph_inode_set_size(inode
, endoff
))
1253 ceph_check_caps(ceph_inode(inode
),
1254 CHECK_CAPS_AUTHONLY
, NULL
);
1258 spin_lock(&ci
->i_ceph_lock
);
1259 dirty
= __ceph_mark_dirty_caps(ci
, CEPH_CAP_FILE_WR
);
1260 spin_unlock(&ci
->i_ceph_lock
);
1262 __mark_inode_dirty(inode
, dirty
);
1265 ceph_put_cap_refs(ci
, got
);
1267 mutex_unlock(&inode
->i_mutex
);
1271 const struct file_operations ceph_file_fops
= {
1273 .release
= ceph_release
,
1274 .llseek
= ceph_llseek
,
1275 .read
= do_sync_read
,
1276 .write
= do_sync_write
,
1277 .aio_read
= ceph_aio_read
,
1278 .aio_write
= ceph_aio_write
,
1280 .fsync
= ceph_fsync
,
1282 .flock
= ceph_flock
,
1283 .splice_read
= generic_file_splice_read
,
1284 .splice_write
= generic_file_splice_write
,
1285 .unlocked_ioctl
= ceph_ioctl
,
1286 .compat_ioctl
= ceph_ioctl
,
1287 .fallocate
= ceph_fallocate
,