2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
5 This program can be distributed under the terms of the GNU GPL.
11 #include <linux/pagemap.h>
12 #include <linux/slab.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/module.h>
16 #include <linux/compat.h>
17 #include <linux/swap.h>
19 static const struct file_operations fuse_direct_io_file_operations
;
21 static int fuse_send_open(struct fuse_conn
*fc
, u64 nodeid
, struct file
*file
,
22 int opcode
, struct fuse_open_out
*outargp
)
24 struct fuse_open_in inarg
;
28 req
= fuse_get_req_nopages(fc
);
32 memset(&inarg
, 0, sizeof(inarg
));
33 inarg
.flags
= file
->f_flags
& ~(O_CREAT
| O_EXCL
| O_NOCTTY
);
34 if (!fc
->atomic_o_trunc
)
35 inarg
.flags
&= ~O_TRUNC
;
36 req
->in
.h
.opcode
= opcode
;
37 req
->in
.h
.nodeid
= nodeid
;
39 req
->in
.args
[0].size
= sizeof(inarg
);
40 req
->in
.args
[0].value
= &inarg
;
42 req
->out
.args
[0].size
= sizeof(*outargp
);
43 req
->out
.args
[0].value
= outargp
;
44 fuse_request_send(fc
, req
);
45 err
= req
->out
.h
.error
;
46 fuse_put_request(fc
, req
);
51 struct fuse_file
*fuse_file_alloc(struct fuse_conn
*fc
)
55 ff
= kmalloc(sizeof(struct fuse_file
), GFP_KERNEL
);
60 ff
->reserved_req
= fuse_request_alloc(0);
61 if (unlikely(!ff
->reserved_req
)) {
66 INIT_LIST_HEAD(&ff
->write_entry
);
67 atomic_set(&ff
->count
, 0);
68 RB_CLEAR_NODE(&ff
->polled_node
);
69 init_waitqueue_head(&ff
->poll_wait
);
73 spin_unlock(&fc
->lock
);
78 void fuse_file_free(struct fuse_file
*ff
)
80 fuse_request_free(ff
->reserved_req
);
84 struct fuse_file
*fuse_file_get(struct fuse_file
*ff
)
86 atomic_inc(&ff
->count
);
90 static void fuse_release_async(struct work_struct
*work
)
96 req
= container_of(work
, struct fuse_req
, misc
.release
.work
);
97 path
= req
->misc
.release
.path
;
98 fc
= get_fuse_conn(path
.dentry
->d_inode
);
100 fuse_put_request(fc
, req
);
104 static void fuse_release_end(struct fuse_conn
*fc
, struct fuse_req
*req
)
106 if (fc
->destroy_req
) {
108 * If this is a fuseblk mount, then it's possible that
109 * releasing the path will result in releasing the
110 * super block and sending the DESTROY request. If
111 * the server is single threaded, this would hang.
112 * For this reason do the path_put() in a separate
115 atomic_inc(&req
->count
);
116 INIT_WORK(&req
->misc
.release
.work
, fuse_release_async
);
117 schedule_work(&req
->misc
.release
.work
);
119 path_put(&req
->misc
.release
.path
);
123 static void fuse_file_put(struct fuse_file
*ff
, bool sync
)
125 if (atomic_dec_and_test(&ff
->count
)) {
126 struct fuse_req
*req
= ff
->reserved_req
;
130 fuse_request_send(ff
->fc
, req
);
131 path_put(&req
->misc
.release
.path
);
132 fuse_put_request(ff
->fc
, req
);
134 req
->end
= fuse_release_end
;
136 fuse_request_send_background(ff
->fc
, req
);
142 int fuse_do_open(struct fuse_conn
*fc
, u64 nodeid
, struct file
*file
,
145 struct fuse_open_out outarg
;
146 struct fuse_file
*ff
;
148 int opcode
= isdir
? FUSE_OPENDIR
: FUSE_OPEN
;
150 ff
= fuse_file_alloc(fc
);
154 err
= fuse_send_open(fc
, nodeid
, file
, opcode
, &outarg
);
161 outarg
.open_flags
&= ~FOPEN_DIRECT_IO
;
165 ff
->open_flags
= outarg
.open_flags
;
166 file
->private_data
= fuse_file_get(ff
);
170 EXPORT_SYMBOL_GPL(fuse_do_open
);
172 void fuse_finish_open(struct inode
*inode
, struct file
*file
)
174 struct fuse_file
*ff
= file
->private_data
;
175 struct fuse_conn
*fc
= get_fuse_conn(inode
);
177 if (ff
->open_flags
& FOPEN_DIRECT_IO
)
178 file
->f_op
= &fuse_direct_io_file_operations
;
179 if (!(ff
->open_flags
& FOPEN_KEEP_CACHE
))
180 invalidate_inode_pages2(inode
->i_mapping
);
181 if (ff
->open_flags
& FOPEN_NONSEEKABLE
)
182 nonseekable_open(inode
, file
);
183 if (fc
->atomic_o_trunc
&& (file
->f_flags
& O_TRUNC
)) {
184 struct fuse_inode
*fi
= get_fuse_inode(inode
);
186 spin_lock(&fc
->lock
);
187 fi
->attr_version
= ++fc
->attr_version
;
188 i_size_write(inode
, 0);
189 spin_unlock(&fc
->lock
);
190 fuse_invalidate_attr(inode
);
194 int fuse_open_common(struct inode
*inode
, struct file
*file
, bool isdir
)
196 struct fuse_conn
*fc
= get_fuse_conn(inode
);
199 err
= generic_file_open(inode
, file
);
203 err
= fuse_do_open(fc
, get_node_id(inode
), file
, isdir
);
207 fuse_finish_open(inode
, file
);
212 static void fuse_prepare_release(struct fuse_file
*ff
, int flags
, int opcode
)
214 struct fuse_conn
*fc
= ff
->fc
;
215 struct fuse_req
*req
= ff
->reserved_req
;
216 struct fuse_release_in
*inarg
= &req
->misc
.release
.in
;
218 spin_lock(&fc
->lock
);
219 list_del(&ff
->write_entry
);
220 if (!RB_EMPTY_NODE(&ff
->polled_node
))
221 rb_erase(&ff
->polled_node
, &fc
->polled_files
);
222 spin_unlock(&fc
->lock
);
224 wake_up_interruptible_all(&ff
->poll_wait
);
227 inarg
->flags
= flags
;
228 req
->in
.h
.opcode
= opcode
;
229 req
->in
.h
.nodeid
= ff
->nodeid
;
231 req
->in
.args
[0].size
= sizeof(struct fuse_release_in
);
232 req
->in
.args
[0].value
= inarg
;
235 void fuse_release_common(struct file
*file
, int opcode
)
237 struct fuse_file
*ff
;
238 struct fuse_req
*req
;
240 ff
= file
->private_data
;
244 req
= ff
->reserved_req
;
245 fuse_prepare_release(ff
, file
->f_flags
, opcode
);
248 struct fuse_release_in
*inarg
= &req
->misc
.release
.in
;
249 inarg
->release_flags
|= FUSE_RELEASE_FLOCK_UNLOCK
;
250 inarg
->lock_owner
= fuse_lock_owner_id(ff
->fc
,
253 /* Hold vfsmount and dentry until release is finished */
254 path_get(&file
->f_path
);
255 req
->misc
.release
.path
= file
->f_path
;
258 * Normally this will send the RELEASE request, however if
259 * some asynchronous READ or WRITE requests are outstanding,
260 * the sending will be delayed.
262 * Make the release synchronous if this is a fuseblk mount,
263 * synchronous RELEASE is allowed (and desirable) in this case
264 * because the server can be trusted not to screw up.
266 fuse_file_put(ff
, ff
->fc
->destroy_req
!= NULL
);
269 static int fuse_open(struct inode
*inode
, struct file
*file
)
271 return fuse_open_common(inode
, file
, false);
274 static int fuse_release(struct inode
*inode
, struct file
*file
)
276 fuse_release_common(file
, FUSE_RELEASE
);
278 /* return value is ignored by VFS */
282 void fuse_sync_release(struct fuse_file
*ff
, int flags
)
284 WARN_ON(atomic_read(&ff
->count
) > 1);
285 fuse_prepare_release(ff
, flags
, FUSE_RELEASE
);
286 ff
->reserved_req
->force
= 1;
287 ff
->reserved_req
->background
= 0;
288 fuse_request_send(ff
->fc
, ff
->reserved_req
);
289 fuse_put_request(ff
->fc
, ff
->reserved_req
);
292 EXPORT_SYMBOL_GPL(fuse_sync_release
);
295 * Scramble the ID space with XTEA, so that the value of the files_struct
296 * pointer is not exposed to userspace.
298 u64
fuse_lock_owner_id(struct fuse_conn
*fc
, fl_owner_t id
)
300 u32
*k
= fc
->scramble_key
;
301 u64 v
= (unsigned long) id
;
307 for (i
= 0; i
< 32; i
++) {
308 v0
+= ((v1
<< 4 ^ v1
>> 5) + v1
) ^ (sum
+ k
[sum
& 3]);
310 v1
+= ((v0
<< 4 ^ v0
>> 5) + v0
) ^ (sum
+ k
[sum
>>11 & 3]);
313 return (u64
) v0
+ ((u64
) v1
<< 32);
317 * Check if page is under writeback
319 * This is currently done by walking the list of writepage requests
320 * for the inode, which can be pretty inefficient.
322 static bool fuse_page_is_writeback(struct inode
*inode
, pgoff_t index
)
324 struct fuse_conn
*fc
= get_fuse_conn(inode
);
325 struct fuse_inode
*fi
= get_fuse_inode(inode
);
326 struct fuse_req
*req
;
329 spin_lock(&fc
->lock
);
330 list_for_each_entry(req
, &fi
->writepages
, writepages_entry
) {
333 BUG_ON(req
->inode
!= inode
);
334 curr_index
= req
->misc
.write
.in
.offset
>> PAGE_CACHE_SHIFT
;
335 if (curr_index
== index
) {
340 spin_unlock(&fc
->lock
);
346 * Wait for page writeback to be completed.
348 * Since fuse doesn't rely on the VM writeback tracking, this has to
349 * use some other means.
351 static int fuse_wait_on_page_writeback(struct inode
*inode
, pgoff_t index
)
353 struct fuse_inode
*fi
= get_fuse_inode(inode
);
355 wait_event(fi
->page_waitq
, !fuse_page_is_writeback(inode
, index
));
359 static int fuse_flush(struct file
*file
, fl_owner_t id
)
361 struct inode
*inode
= file_inode(file
);
362 struct fuse_conn
*fc
= get_fuse_conn(inode
);
363 struct fuse_file
*ff
= file
->private_data
;
364 struct fuse_req
*req
;
365 struct fuse_flush_in inarg
;
368 if (is_bad_inode(inode
))
374 req
= fuse_get_req_nofail_nopages(fc
, file
);
375 memset(&inarg
, 0, sizeof(inarg
));
377 inarg
.lock_owner
= fuse_lock_owner_id(fc
, id
);
378 req
->in
.h
.opcode
= FUSE_FLUSH
;
379 req
->in
.h
.nodeid
= get_node_id(inode
);
381 req
->in
.args
[0].size
= sizeof(inarg
);
382 req
->in
.args
[0].value
= &inarg
;
384 fuse_request_send(fc
, req
);
385 err
= req
->out
.h
.error
;
386 fuse_put_request(fc
, req
);
387 if (err
== -ENOSYS
) {
395 * Wait for all pending writepages on the inode to finish.
397 * This is currently done by blocking further writes with FUSE_NOWRITE
398 * and waiting for all sent writes to complete.
400 * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage
401 * could conflict with truncation.
403 static void fuse_sync_writes(struct inode
*inode
)
405 fuse_set_nowrite(inode
);
406 fuse_release_nowrite(inode
);
409 int fuse_fsync_common(struct file
*file
, loff_t start
, loff_t end
,
410 int datasync
, int isdir
)
412 struct inode
*inode
= file
->f_mapping
->host
;
413 struct fuse_conn
*fc
= get_fuse_conn(inode
);
414 struct fuse_file
*ff
= file
->private_data
;
415 struct fuse_req
*req
;
416 struct fuse_fsync_in inarg
;
419 if (is_bad_inode(inode
))
422 err
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
426 if ((!isdir
&& fc
->no_fsync
) || (isdir
&& fc
->no_fsyncdir
))
429 mutex_lock(&inode
->i_mutex
);
432 * Start writeback against all dirty pages of the inode, then
433 * wait for all outstanding writes, before sending the FSYNC
436 err
= write_inode_now(inode
, 0);
440 fuse_sync_writes(inode
);
442 req
= fuse_get_req_nopages(fc
);
448 memset(&inarg
, 0, sizeof(inarg
));
450 inarg
.fsync_flags
= datasync
? 1 : 0;
451 req
->in
.h
.opcode
= isdir
? FUSE_FSYNCDIR
: FUSE_FSYNC
;
452 req
->in
.h
.nodeid
= get_node_id(inode
);
454 req
->in
.args
[0].size
= sizeof(inarg
);
455 req
->in
.args
[0].value
= &inarg
;
456 fuse_request_send(fc
, req
);
457 err
= req
->out
.h
.error
;
458 fuse_put_request(fc
, req
);
459 if (err
== -ENOSYS
) {
467 mutex_unlock(&inode
->i_mutex
);
471 static int fuse_fsync(struct file
*file
, loff_t start
, loff_t end
,
474 return fuse_fsync_common(file
, start
, end
, datasync
, 0);
477 void fuse_read_fill(struct fuse_req
*req
, struct file
*file
, loff_t pos
,
478 size_t count
, int opcode
)
480 struct fuse_read_in
*inarg
= &req
->misc
.read
.in
;
481 struct fuse_file
*ff
= file
->private_data
;
486 inarg
->flags
= file
->f_flags
;
487 req
->in
.h
.opcode
= opcode
;
488 req
->in
.h
.nodeid
= ff
->nodeid
;
490 req
->in
.args
[0].size
= sizeof(struct fuse_read_in
);
491 req
->in
.args
[0].value
= inarg
;
493 req
->out
.numargs
= 1;
494 req
->out
.args
[0].size
= count
;
497 static void fuse_release_user_pages(struct fuse_req
*req
, int write
)
501 for (i
= 0; i
< req
->num_pages
; i
++) {
502 struct page
*page
= req
->pages
[i
];
504 set_page_dirty_lock(page
);
510 * In case of short read, the caller sets 'pos' to the position of
511 * actual end of fuse request in IO request. Otherwise, if bytes_requested
512 * == bytes_transferred or rw == WRITE, the caller sets 'pos' to -1.
515 * User requested DIO read of 64K. It was splitted into two 32K fuse requests,
516 * both submitted asynchronously. The first of them was ACKed by userspace as
517 * fully completed (req->out.args[0].size == 32K) resulting in pos == -1. The
518 * second request was ACKed as short, e.g. only 1K was read, resulting in
521 * Thus, when all fuse requests are completed, the minimal non-negative 'pos'
522 * will be equal to the length of the longest contiguous fragment of
523 * transferred data starting from the beginning of IO request.
525 static void fuse_aio_complete(struct fuse_io_priv
*io
, int err
, ssize_t pos
)
529 spin_lock(&io
->lock
);
531 io
->err
= io
->err
? : err
;
532 else if (pos
>= 0 && (io
->bytes
< 0 || pos
< io
->bytes
))
536 spin_unlock(&io
->lock
);
543 else if (io
->bytes
>= 0 && io
->write
)
546 res
= io
->bytes
< 0 ? io
->size
: io
->bytes
;
548 if (!is_sync_kiocb(io
->iocb
)) {
549 struct path
*path
= &io
->iocb
->ki_filp
->f_path
;
550 struct inode
*inode
= path
->dentry
->d_inode
;
551 struct fuse_conn
*fc
= get_fuse_conn(inode
);
552 struct fuse_inode
*fi
= get_fuse_inode(inode
);
554 spin_lock(&fc
->lock
);
555 fi
->attr_version
= ++fc
->attr_version
;
556 spin_unlock(&fc
->lock
);
560 aio_complete(io
->iocb
, res
, 0);
565 static void fuse_aio_complete_req(struct fuse_conn
*fc
, struct fuse_req
*req
)
567 struct fuse_io_priv
*io
= req
->io
;
570 fuse_release_user_pages(req
, !io
->write
);
573 if (req
->misc
.write
.in
.size
!= req
->misc
.write
.out
.size
)
574 pos
= req
->misc
.write
.in
.offset
- io
->offset
+
575 req
->misc
.write
.out
.size
;
577 if (req
->misc
.read
.in
.size
!= req
->out
.args
[0].size
)
578 pos
= req
->misc
.read
.in
.offset
- io
->offset
+
579 req
->out
.args
[0].size
;
582 fuse_aio_complete(io
, req
->out
.h
.error
, pos
);
585 static size_t fuse_async_req_send(struct fuse_conn
*fc
, struct fuse_req
*req
,
586 size_t num_bytes
, struct fuse_io_priv
*io
)
588 spin_lock(&io
->lock
);
589 io
->size
+= num_bytes
;
591 spin_unlock(&io
->lock
);
594 req
->end
= fuse_aio_complete_req
;
596 __fuse_get_request(req
);
597 fuse_request_send_background(fc
, req
);
602 static size_t fuse_send_read(struct fuse_req
*req
, struct fuse_io_priv
*io
,
603 loff_t pos
, size_t count
, fl_owner_t owner
)
605 struct file
*file
= io
->file
;
606 struct fuse_file
*ff
= file
->private_data
;
607 struct fuse_conn
*fc
= ff
->fc
;
609 fuse_read_fill(req
, file
, pos
, count
, FUSE_READ
);
611 struct fuse_read_in
*inarg
= &req
->misc
.read
.in
;
613 inarg
->read_flags
|= FUSE_READ_LOCKOWNER
;
614 inarg
->lock_owner
= fuse_lock_owner_id(fc
, owner
);
618 return fuse_async_req_send(fc
, req
, count
, io
);
620 fuse_request_send(fc
, req
);
621 return req
->out
.args
[0].size
;
624 static void fuse_read_update_size(struct inode
*inode
, loff_t size
,
627 struct fuse_conn
*fc
= get_fuse_conn(inode
);
628 struct fuse_inode
*fi
= get_fuse_inode(inode
);
630 spin_lock(&fc
->lock
);
631 if (attr_ver
== fi
->attr_version
&& size
< inode
->i_size
) {
632 fi
->attr_version
= ++fc
->attr_version
;
633 i_size_write(inode
, size
);
635 spin_unlock(&fc
->lock
);
638 static int fuse_readpage(struct file
*file
, struct page
*page
)
640 struct fuse_io_priv io
= { .async
= 0, .file
= file
};
641 struct inode
*inode
= page
->mapping
->host
;
642 struct fuse_conn
*fc
= get_fuse_conn(inode
);
643 struct fuse_req
*req
;
645 loff_t pos
= page_offset(page
);
646 size_t count
= PAGE_CACHE_SIZE
;
651 if (is_bad_inode(inode
))
655 * Page writeback can extend beyond the lifetime of the
656 * page-cache page, so make sure we read a properly synced
659 fuse_wait_on_page_writeback(inode
, page
->index
);
661 req
= fuse_get_req(fc
, 1);
666 attr_ver
= fuse_get_attr_version(fc
);
668 req
->out
.page_zeroing
= 1;
669 req
->out
.argpages
= 1;
671 req
->pages
[0] = page
;
672 req
->page_descs
[0].length
= count
;
673 num_read
= fuse_send_read(req
, &io
, pos
, count
, NULL
);
674 err
= req
->out
.h
.error
;
675 fuse_put_request(fc
, req
);
679 * Short read means EOF. If file size is larger, truncate it
681 if (num_read
< count
)
682 fuse_read_update_size(inode
, pos
+ num_read
, attr_ver
);
684 SetPageUptodate(page
);
687 fuse_invalidate_attr(inode
); /* atime changed */
693 static void fuse_readpages_end(struct fuse_conn
*fc
, struct fuse_req
*req
)
696 size_t count
= req
->misc
.read
.in
.size
;
697 size_t num_read
= req
->out
.args
[0].size
;
698 struct address_space
*mapping
= NULL
;
700 for (i
= 0; mapping
== NULL
&& i
< req
->num_pages
; i
++)
701 mapping
= req
->pages
[i
]->mapping
;
704 struct inode
*inode
= mapping
->host
;
707 * Short read means EOF. If file size is larger, truncate it
709 if (!req
->out
.h
.error
&& num_read
< count
) {
712 pos
= page_offset(req
->pages
[0]) + num_read
;
713 fuse_read_update_size(inode
, pos
,
714 req
->misc
.read
.attr_ver
);
716 fuse_invalidate_attr(inode
); /* atime changed */
719 for (i
= 0; i
< req
->num_pages
; i
++) {
720 struct page
*page
= req
->pages
[i
];
721 if (!req
->out
.h
.error
)
722 SetPageUptodate(page
);
726 page_cache_release(page
);
729 fuse_file_put(req
->ff
, false);
732 static void fuse_send_readpages(struct fuse_req
*req
, struct file
*file
)
734 struct fuse_file
*ff
= file
->private_data
;
735 struct fuse_conn
*fc
= ff
->fc
;
736 loff_t pos
= page_offset(req
->pages
[0]);
737 size_t count
= req
->num_pages
<< PAGE_CACHE_SHIFT
;
739 req
->out
.argpages
= 1;
740 req
->out
.page_zeroing
= 1;
741 req
->out
.page_replace
= 1;
742 fuse_read_fill(req
, file
, pos
, count
, FUSE_READ
);
743 req
->misc
.read
.attr_ver
= fuse_get_attr_version(fc
);
744 if (fc
->async_read
) {
745 req
->ff
= fuse_file_get(ff
);
746 req
->end
= fuse_readpages_end
;
747 fuse_request_send_background(fc
, req
);
749 fuse_request_send(fc
, req
);
750 fuse_readpages_end(fc
, req
);
751 fuse_put_request(fc
, req
);
755 struct fuse_fill_data
{
756 struct fuse_req
*req
;
762 static int fuse_readpages_fill(void *_data
, struct page
*page
)
764 struct fuse_fill_data
*data
= _data
;
765 struct fuse_req
*req
= data
->req
;
766 struct inode
*inode
= data
->inode
;
767 struct fuse_conn
*fc
= get_fuse_conn(inode
);
769 fuse_wait_on_page_writeback(inode
, page
->index
);
771 if (req
->num_pages
&&
772 (req
->num_pages
== FUSE_MAX_PAGES_PER_REQ
||
773 (req
->num_pages
+ 1) * PAGE_CACHE_SIZE
> fc
->max_read
||
774 req
->pages
[req
->num_pages
- 1]->index
+ 1 != page
->index
)) {
775 int nr_alloc
= min_t(unsigned, data
->nr_pages
,
776 FUSE_MAX_PAGES_PER_REQ
);
777 fuse_send_readpages(req
, data
->file
);
779 req
= fuse_get_req_for_background(fc
, nr_alloc
);
781 req
= fuse_get_req(fc
, nr_alloc
);
790 if (WARN_ON(req
->num_pages
>= req
->max_pages
)) {
791 fuse_put_request(fc
, req
);
795 page_cache_get(page
);
796 req
->pages
[req
->num_pages
] = page
;
797 req
->page_descs
[req
->num_pages
].length
= PAGE_SIZE
;
803 static int fuse_readpages(struct file
*file
, struct address_space
*mapping
,
804 struct list_head
*pages
, unsigned nr_pages
)
806 struct inode
*inode
= mapping
->host
;
807 struct fuse_conn
*fc
= get_fuse_conn(inode
);
808 struct fuse_fill_data data
;
810 int nr_alloc
= min_t(unsigned, nr_pages
, FUSE_MAX_PAGES_PER_REQ
);
813 if (is_bad_inode(inode
))
819 data
.req
= fuse_get_req_for_background(fc
, nr_alloc
);
821 data
.req
= fuse_get_req(fc
, nr_alloc
);
822 data
.nr_pages
= nr_pages
;
823 err
= PTR_ERR(data
.req
);
824 if (IS_ERR(data
.req
))
827 err
= read_cache_pages(mapping
, pages
, fuse_readpages_fill
, &data
);
829 if (data
.req
->num_pages
)
830 fuse_send_readpages(data
.req
, file
);
832 fuse_put_request(fc
, data
.req
);
838 static ssize_t
fuse_file_aio_read(struct kiocb
*iocb
, const struct iovec
*iov
,
839 unsigned long nr_segs
, loff_t pos
)
841 struct inode
*inode
= iocb
->ki_filp
->f_mapping
->host
;
842 struct fuse_conn
*fc
= get_fuse_conn(inode
);
845 * In auto invalidate mode, always update attributes on read.
846 * Otherwise, only update if we attempt to read past EOF (to ensure
847 * i_size is up to date).
849 if (fc
->auto_inval_data
||
850 (pos
+ iov_length(iov
, nr_segs
) > i_size_read(inode
))) {
852 err
= fuse_update_attributes(inode
, NULL
, iocb
->ki_filp
, NULL
);
857 return generic_file_aio_read(iocb
, iov
, nr_segs
, pos
);
860 static void fuse_write_fill(struct fuse_req
*req
, struct fuse_file
*ff
,
861 loff_t pos
, size_t count
)
863 struct fuse_write_in
*inarg
= &req
->misc
.write
.in
;
864 struct fuse_write_out
*outarg
= &req
->misc
.write
.out
;
869 req
->in
.h
.opcode
= FUSE_WRITE
;
870 req
->in
.h
.nodeid
= ff
->nodeid
;
872 if (ff
->fc
->minor
< 9)
873 req
->in
.args
[0].size
= FUSE_COMPAT_WRITE_IN_SIZE
;
875 req
->in
.args
[0].size
= sizeof(struct fuse_write_in
);
876 req
->in
.args
[0].value
= inarg
;
877 req
->in
.args
[1].size
= count
;
878 req
->out
.numargs
= 1;
879 req
->out
.args
[0].size
= sizeof(struct fuse_write_out
);
880 req
->out
.args
[0].value
= outarg
;
883 static size_t fuse_send_write(struct fuse_req
*req
, struct fuse_io_priv
*io
,
884 loff_t pos
, size_t count
, fl_owner_t owner
)
886 struct file
*file
= io
->file
;
887 struct fuse_file
*ff
= file
->private_data
;
888 struct fuse_conn
*fc
= ff
->fc
;
889 struct fuse_write_in
*inarg
= &req
->misc
.write
.in
;
891 fuse_write_fill(req
, ff
, pos
, count
);
892 inarg
->flags
= file
->f_flags
;
894 inarg
->write_flags
|= FUSE_WRITE_LOCKOWNER
;
895 inarg
->lock_owner
= fuse_lock_owner_id(fc
, owner
);
899 return fuse_async_req_send(fc
, req
, count
, io
);
901 fuse_request_send(fc
, req
);
902 return req
->misc
.write
.out
.size
;
905 void fuse_write_update_size(struct inode
*inode
, loff_t pos
)
907 struct fuse_conn
*fc
= get_fuse_conn(inode
);
908 struct fuse_inode
*fi
= get_fuse_inode(inode
);
910 spin_lock(&fc
->lock
);
911 fi
->attr_version
= ++fc
->attr_version
;
912 if (pos
> inode
->i_size
)
913 i_size_write(inode
, pos
);
914 spin_unlock(&fc
->lock
);
917 static size_t fuse_send_write_pages(struct fuse_req
*req
, struct file
*file
,
918 struct inode
*inode
, loff_t pos
,
924 struct fuse_io_priv io
= { .async
= 0, .file
= file
};
926 for (i
= 0; i
< req
->num_pages
; i
++)
927 fuse_wait_on_page_writeback(inode
, req
->pages
[i
]->index
);
929 res
= fuse_send_write(req
, &io
, pos
, count
, NULL
);
931 offset
= req
->page_descs
[0].offset
;
933 for (i
= 0; i
< req
->num_pages
; i
++) {
934 struct page
*page
= req
->pages
[i
];
936 if (!req
->out
.h
.error
&& !offset
&& count
>= PAGE_CACHE_SIZE
)
937 SetPageUptodate(page
);
939 if (count
> PAGE_CACHE_SIZE
- offset
)
940 count
-= PAGE_CACHE_SIZE
- offset
;
946 page_cache_release(page
);
952 static ssize_t
fuse_fill_write_pages(struct fuse_req
*req
,
953 struct address_space
*mapping
,
954 struct iov_iter
*ii
, loff_t pos
)
956 struct fuse_conn
*fc
= get_fuse_conn(mapping
->host
);
957 unsigned offset
= pos
& (PAGE_CACHE_SIZE
- 1);
961 req
->in
.argpages
= 1;
962 req
->page_descs
[0].offset
= offset
;
967 pgoff_t index
= pos
>> PAGE_CACHE_SHIFT
;
968 size_t bytes
= min_t(size_t, PAGE_CACHE_SIZE
- offset
,
971 bytes
= min_t(size_t, bytes
, fc
->max_write
- count
);
975 if (iov_iter_fault_in_readable(ii
, bytes
))
979 page
= grab_cache_page_write_begin(mapping
, index
, 0);
983 if (mapping_writably_mapped(mapping
))
984 flush_dcache_page(page
);
987 tmp
= iov_iter_copy_from_user_atomic(page
, ii
, offset
, bytes
);
989 flush_dcache_page(page
);
991 mark_page_accessed(page
);
995 page_cache_release(page
);
996 bytes
= min(bytes
, iov_iter_single_seg_count(ii
));
1001 req
->pages
[req
->num_pages
] = page
;
1002 req
->page_descs
[req
->num_pages
].length
= tmp
;
1005 iov_iter_advance(ii
, tmp
);
1009 if (offset
== PAGE_CACHE_SIZE
)
1012 if (!fc
->big_writes
)
1014 } while (iov_iter_count(ii
) && count
< fc
->max_write
&&
1015 req
->num_pages
< req
->max_pages
&& offset
== 0);
1017 return count
> 0 ? count
: err
;
1020 static inline unsigned fuse_wr_pages(loff_t pos
, size_t len
)
1022 return min_t(unsigned,
1023 ((pos
+ len
- 1) >> PAGE_CACHE_SHIFT
) -
1024 (pos
>> PAGE_CACHE_SHIFT
) + 1,
1025 FUSE_MAX_PAGES_PER_REQ
);
1028 static ssize_t
fuse_perform_write(struct file
*file
,
1029 struct address_space
*mapping
,
1030 struct iov_iter
*ii
, loff_t pos
)
1032 struct inode
*inode
= mapping
->host
;
1033 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1037 if (is_bad_inode(inode
))
1041 struct fuse_req
*req
;
1043 unsigned nr_pages
= fuse_wr_pages(pos
, iov_iter_count(ii
));
1045 req
= fuse_get_req(fc
, nr_pages
);
1051 count
= fuse_fill_write_pages(req
, mapping
, ii
, pos
);
1057 num_written
= fuse_send_write_pages(req
, file
, inode
,
1059 err
= req
->out
.h
.error
;
1064 /* break out of the loop on short write */
1065 if (num_written
!= count
)
1069 fuse_put_request(fc
, req
);
1070 } while (!err
&& iov_iter_count(ii
));
1073 fuse_write_update_size(inode
, pos
);
1075 fuse_invalidate_attr(inode
);
1077 return res
> 0 ? res
: err
;
1080 static ssize_t
fuse_file_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
1081 unsigned long nr_segs
, loff_t pos
)
1083 struct file
*file
= iocb
->ki_filp
;
1084 struct address_space
*mapping
= file
->f_mapping
;
1087 ssize_t written
= 0;
1088 ssize_t written_buffered
= 0;
1089 struct inode
*inode
= mapping
->host
;
1094 WARN_ON(iocb
->ki_pos
!= pos
);
1097 err
= generic_segment_checks(iov
, &nr_segs
, &ocount
, VERIFY_READ
);
1102 sb_start_write(inode
->i_sb
);
1103 mutex_lock(&inode
->i_mutex
);
1105 /* We can write back this queue in page reclaim */
1106 current
->backing_dev_info
= mapping
->backing_dev_info
;
1108 err
= generic_write_checks(file
, &pos
, &count
, S_ISBLK(inode
->i_mode
));
1115 err
= file_remove_suid(file
);
1119 err
= file_update_time(file
);
1123 if (file
->f_flags
& O_DIRECT
) {
1124 written
= generic_file_direct_write(iocb
, iov
, &nr_segs
,
1127 if (written
< 0 || written
== count
)
1133 iov_iter_init(&i
, iov
, nr_segs
, count
, written
);
1134 written_buffered
= fuse_perform_write(file
, mapping
, &i
, pos
);
1135 if (written_buffered
< 0) {
1136 err
= written_buffered
;
1139 endbyte
= pos
+ written_buffered
- 1;
1141 err
= filemap_write_and_wait_range(file
->f_mapping
, pos
,
1146 invalidate_mapping_pages(file
->f_mapping
,
1147 pos
>> PAGE_CACHE_SHIFT
,
1148 endbyte
>> PAGE_CACHE_SHIFT
);
1150 written
+= written_buffered
;
1151 iocb
->ki_pos
= pos
+ written_buffered
;
1153 iov_iter_init(&i
, iov
, nr_segs
, count
, 0);
1154 written
= fuse_perform_write(file
, mapping
, &i
, pos
);
1156 iocb
->ki_pos
= pos
+ written
;
1159 current
->backing_dev_info
= NULL
;
1160 mutex_unlock(&inode
->i_mutex
);
1161 sb_end_write(inode
->i_sb
);
1163 return written
? written
: err
;
1166 static inline void fuse_page_descs_length_init(struct fuse_req
*req
,
1167 unsigned index
, unsigned nr_pages
)
1171 for (i
= index
; i
< index
+ nr_pages
; i
++)
1172 req
->page_descs
[i
].length
= PAGE_SIZE
-
1173 req
->page_descs
[i
].offset
;
1176 static inline unsigned long fuse_get_user_addr(const struct iov_iter
*ii
)
1178 return (unsigned long)ii
->iov
->iov_base
+ ii
->iov_offset
;
1181 static inline size_t fuse_get_frag_size(const struct iov_iter
*ii
,
1184 return min(iov_iter_single_seg_count(ii
), max_size
);
1187 static int fuse_get_user_pages(struct fuse_req
*req
, struct iov_iter
*ii
,
1188 size_t *nbytesp
, int write
)
1190 size_t nbytes
= 0; /* # bytes already packed in req */
1192 /* Special case for kernel I/O: can copy directly into the buffer */
1193 if (segment_eq(get_fs(), KERNEL_DS
)) {
1194 unsigned long user_addr
= fuse_get_user_addr(ii
);
1195 size_t frag_size
= fuse_get_frag_size(ii
, *nbytesp
);
1198 req
->in
.args
[1].value
= (void *) user_addr
;
1200 req
->out
.args
[0].value
= (void *) user_addr
;
1202 iov_iter_advance(ii
, frag_size
);
1203 *nbytesp
= frag_size
;
1207 while (nbytes
< *nbytesp
&& req
->num_pages
< req
->max_pages
) {
1209 unsigned long user_addr
= fuse_get_user_addr(ii
);
1210 unsigned offset
= user_addr
& ~PAGE_MASK
;
1211 size_t frag_size
= fuse_get_frag_size(ii
, *nbytesp
- nbytes
);
1214 unsigned n
= req
->max_pages
- req
->num_pages
;
1215 frag_size
= min_t(size_t, frag_size
, n
<< PAGE_SHIFT
);
1217 npages
= (frag_size
+ offset
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
1218 npages
= clamp(npages
, 1U, n
);
1220 ret
= get_user_pages_fast(user_addr
, npages
, !write
,
1221 &req
->pages
[req
->num_pages
]);
1226 frag_size
= min_t(size_t, frag_size
,
1227 (npages
<< PAGE_SHIFT
) - offset
);
1228 iov_iter_advance(ii
, frag_size
);
1230 req
->page_descs
[req
->num_pages
].offset
= offset
;
1231 fuse_page_descs_length_init(req
, req
->num_pages
, npages
);
1233 req
->num_pages
+= npages
;
1234 req
->page_descs
[req
->num_pages
- 1].length
-=
1235 (npages
<< PAGE_SHIFT
) - offset
- frag_size
;
1237 nbytes
+= frag_size
;
1241 req
->in
.argpages
= 1;
1243 req
->out
.argpages
= 1;
1250 static inline int fuse_iter_npages(const struct iov_iter
*ii_p
)
1252 struct iov_iter ii
= *ii_p
;
1255 while (iov_iter_count(&ii
) && npages
< FUSE_MAX_PAGES_PER_REQ
) {
1256 unsigned long user_addr
= fuse_get_user_addr(&ii
);
1257 unsigned offset
= user_addr
& ~PAGE_MASK
;
1258 size_t frag_size
= iov_iter_single_seg_count(&ii
);
1260 npages
+= (frag_size
+ offset
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
1261 iov_iter_advance(&ii
, frag_size
);
1264 return min(npages
, FUSE_MAX_PAGES_PER_REQ
);
1267 ssize_t
fuse_direct_io(struct fuse_io_priv
*io
, const struct iovec
*iov
,
1268 unsigned long nr_segs
, size_t count
, loff_t
*ppos
,
1271 struct file
*file
= io
->file
;
1272 struct fuse_file
*ff
= file
->private_data
;
1273 struct fuse_conn
*fc
= ff
->fc
;
1274 size_t nmax
= write
? fc
->max_write
: fc
->max_read
;
1277 struct fuse_req
*req
;
1280 iov_iter_init(&ii
, iov
, nr_segs
, count
, 0);
1282 req
= fuse_get_req(fc
, fuse_iter_npages(&ii
));
1284 return PTR_ERR(req
);
1288 fl_owner_t owner
= current
->files
;
1289 size_t nbytes
= min(count
, nmax
);
1290 int err
= fuse_get_user_pages(req
, &ii
, &nbytes
, write
);
1297 nres
= fuse_send_write(req
, io
, pos
, nbytes
, owner
);
1299 nres
= fuse_send_read(req
, io
, pos
, nbytes
, owner
);
1302 fuse_release_user_pages(req
, !write
);
1303 if (req
->out
.h
.error
) {
1305 res
= req
->out
.h
.error
;
1307 } else if (nres
> nbytes
) {
1317 fuse_put_request(fc
, req
);
1318 req
= fuse_get_req(fc
, fuse_iter_npages(&ii
));
1324 fuse_put_request(fc
, req
);
1330 EXPORT_SYMBOL_GPL(fuse_direct_io
);
1332 static ssize_t
__fuse_direct_read(struct fuse_io_priv
*io
,
1333 const struct iovec
*iov
,
1334 unsigned long nr_segs
, loff_t
*ppos
)
1337 struct file
*file
= io
->file
;
1338 struct inode
*inode
= file_inode(file
);
1340 if (is_bad_inode(inode
))
1343 res
= fuse_direct_io(io
, iov
, nr_segs
, iov_length(iov
, nr_segs
),
1346 fuse_invalidate_attr(inode
);
1351 static ssize_t
fuse_direct_read(struct file
*file
, char __user
*buf
,
1352 size_t count
, loff_t
*ppos
)
1354 struct fuse_io_priv io
= { .async
= 0, .file
= file
};
1355 struct iovec iov
= { .iov_base
= buf
, .iov_len
= count
};
1356 return __fuse_direct_read(&io
, &iov
, 1, ppos
);
1359 static ssize_t
__fuse_direct_write(struct fuse_io_priv
*io
,
1360 const struct iovec
*iov
,
1361 unsigned long nr_segs
, loff_t
*ppos
)
1363 struct file
*file
= io
->file
;
1364 struct inode
*inode
= file_inode(file
);
1365 size_t count
= iov_length(iov
, nr_segs
);
1368 res
= generic_write_checks(file
, ppos
, &count
, 0);
1370 res
= fuse_direct_io(io
, iov
, nr_segs
, count
, ppos
, 1);
1371 if (!io
->async
&& res
> 0)
1372 fuse_write_update_size(inode
, *ppos
);
1375 fuse_invalidate_attr(inode
);
1380 static ssize_t
fuse_direct_write(struct file
*file
, const char __user
*buf
,
1381 size_t count
, loff_t
*ppos
)
1383 struct iovec iov
= { .iov_base
= (void __user
*)buf
, .iov_len
= count
};
1384 struct inode
*inode
= file_inode(file
);
1386 struct fuse_io_priv io
= { .async
= 0, .file
= file
};
1388 if (is_bad_inode(inode
))
1391 /* Don't allow parallel writes to the same file */
1392 mutex_lock(&inode
->i_mutex
);
1393 res
= __fuse_direct_write(&io
, &iov
, 1, ppos
);
1394 mutex_unlock(&inode
->i_mutex
);
1399 static void fuse_writepage_free(struct fuse_conn
*fc
, struct fuse_req
*req
)
1401 __free_page(req
->pages
[0]);
1402 fuse_file_put(req
->ff
, false);
1405 static void fuse_writepage_finish(struct fuse_conn
*fc
, struct fuse_req
*req
)
1407 struct inode
*inode
= req
->inode
;
1408 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1409 struct backing_dev_info
*bdi
= inode
->i_mapping
->backing_dev_info
;
1411 list_del(&req
->writepages_entry
);
1412 dec_bdi_stat(bdi
, BDI_WRITEBACK
);
1413 dec_zone_page_state(req
->pages
[0], NR_WRITEBACK_TEMP
);
1414 bdi_writeout_inc(bdi
);
1415 wake_up(&fi
->page_waitq
);
1418 /* Called under fc->lock, may release and reacquire it */
1419 static void fuse_send_writepage(struct fuse_conn
*fc
, struct fuse_req
*req
)
1420 __releases(fc
->lock
)
1421 __acquires(fc
->lock
)
1423 struct fuse_inode
*fi
= get_fuse_inode(req
->inode
);
1424 loff_t size
= i_size_read(req
->inode
);
1425 struct fuse_write_in
*inarg
= &req
->misc
.write
.in
;
1430 if (inarg
->offset
+ PAGE_CACHE_SIZE
<= size
) {
1431 inarg
->size
= PAGE_CACHE_SIZE
;
1432 } else if (inarg
->offset
< size
) {
1433 inarg
->size
= size
& (PAGE_CACHE_SIZE
- 1);
1435 /* Got truncated off completely */
1439 req
->in
.args
[1].size
= inarg
->size
;
1441 fuse_request_send_background_locked(fc
, req
);
1445 fuse_writepage_finish(fc
, req
);
1446 spin_unlock(&fc
->lock
);
1447 fuse_writepage_free(fc
, req
);
1448 fuse_put_request(fc
, req
);
1449 spin_lock(&fc
->lock
);
1453 * If fi->writectr is positive (no truncate or fsync going on) send
1454 * all queued writepage requests.
1456 * Called with fc->lock
1458 void fuse_flush_writepages(struct inode
*inode
)
1459 __releases(fc
->lock
)
1460 __acquires(fc
->lock
)
1462 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1463 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1464 struct fuse_req
*req
;
1466 while (fi
->writectr
>= 0 && !list_empty(&fi
->queued_writes
)) {
1467 req
= list_entry(fi
->queued_writes
.next
, struct fuse_req
, list
);
1468 list_del_init(&req
->list
);
1469 fuse_send_writepage(fc
, req
);
1473 static void fuse_writepage_end(struct fuse_conn
*fc
, struct fuse_req
*req
)
1475 struct inode
*inode
= req
->inode
;
1476 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1478 mapping_set_error(inode
->i_mapping
, req
->out
.h
.error
);
1479 spin_lock(&fc
->lock
);
1481 fuse_writepage_finish(fc
, req
);
1482 spin_unlock(&fc
->lock
);
1483 fuse_writepage_free(fc
, req
);
1486 static int fuse_writepage_locked(struct page
*page
)
1488 struct address_space
*mapping
= page
->mapping
;
1489 struct inode
*inode
= mapping
->host
;
1490 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1491 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1492 struct fuse_req
*req
;
1493 struct fuse_file
*ff
;
1494 struct page
*tmp_page
;
1496 set_page_writeback(page
);
1498 req
= fuse_request_alloc_nofs(1);
1502 req
->background
= 1; /* writeback always goes to bg_queue */
1503 tmp_page
= alloc_page(GFP_NOFS
| __GFP_HIGHMEM
);
1507 spin_lock(&fc
->lock
);
1508 BUG_ON(list_empty(&fi
->write_files
));
1509 ff
= list_entry(fi
->write_files
.next
, struct fuse_file
, write_entry
);
1510 req
->ff
= fuse_file_get(ff
);
1511 spin_unlock(&fc
->lock
);
1513 fuse_write_fill(req
, ff
, page_offset(page
), 0);
1515 copy_highpage(tmp_page
, page
);
1516 req
->misc
.write
.in
.write_flags
|= FUSE_WRITE_CACHE
;
1517 req
->in
.argpages
= 1;
1519 req
->pages
[0] = tmp_page
;
1520 req
->page_descs
[0].offset
= 0;
1521 req
->page_descs
[0].length
= PAGE_SIZE
;
1522 req
->end
= fuse_writepage_end
;
1525 inc_bdi_stat(mapping
->backing_dev_info
, BDI_WRITEBACK
);
1526 inc_zone_page_state(tmp_page
, NR_WRITEBACK_TEMP
);
1527 end_page_writeback(page
);
1529 spin_lock(&fc
->lock
);
1530 list_add(&req
->writepages_entry
, &fi
->writepages
);
1531 list_add_tail(&req
->list
, &fi
->queued_writes
);
1532 fuse_flush_writepages(inode
);
1533 spin_unlock(&fc
->lock
);
1538 fuse_request_free(req
);
1540 end_page_writeback(page
);
1544 static int fuse_writepage(struct page
*page
, struct writeback_control
*wbc
)
1548 err
= fuse_writepage_locked(page
);
1554 static int fuse_launder_page(struct page
*page
)
1557 if (clear_page_dirty_for_io(page
)) {
1558 struct inode
*inode
= page
->mapping
->host
;
1559 err
= fuse_writepage_locked(page
);
1561 fuse_wait_on_page_writeback(inode
, page
->index
);
1567 * Write back dirty pages now, because there may not be any suitable
1570 static void fuse_vma_close(struct vm_area_struct
*vma
)
1572 filemap_write_and_wait(vma
->vm_file
->f_mapping
);
1576 * Wait for writeback against this page to complete before allowing it
1577 * to be marked dirty again, and hence written back again, possibly
1578 * before the previous writepage completed.
1580 * Block here, instead of in ->writepage(), so that the userspace fs
1581 * can only block processes actually operating on the filesystem.
1583 * Otherwise unprivileged userspace fs would be able to block
1588 * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER
1590 static int fuse_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1592 struct page
*page
= vmf
->page
;
1594 * Don't use page->mapping as it may become NULL from a
1595 * concurrent truncate.
1597 struct inode
*inode
= vma
->vm_file
->f_mapping
->host
;
1599 fuse_wait_on_page_writeback(inode
, page
->index
);
1603 static const struct vm_operations_struct fuse_file_vm_ops
= {
1604 .close
= fuse_vma_close
,
1605 .fault
= filemap_fault
,
1606 .page_mkwrite
= fuse_page_mkwrite
,
1607 .remap_pages
= generic_file_remap_pages
,
1610 static int fuse_file_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1612 if ((vma
->vm_flags
& VM_SHARED
) && (vma
->vm_flags
& VM_MAYWRITE
)) {
1613 struct inode
*inode
= file_inode(file
);
1614 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1615 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1616 struct fuse_file
*ff
= file
->private_data
;
1618 * file may be written through mmap, so chain it onto the
1619 * inodes's write_file list
1621 spin_lock(&fc
->lock
);
1622 if (list_empty(&ff
->write_entry
))
1623 list_add(&ff
->write_entry
, &fi
->write_files
);
1624 spin_unlock(&fc
->lock
);
1626 file_accessed(file
);
1627 vma
->vm_ops
= &fuse_file_vm_ops
;
1631 static int fuse_direct_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1633 /* Can't provide the coherency needed for MAP_SHARED */
1634 if (vma
->vm_flags
& VM_MAYSHARE
)
1637 invalidate_inode_pages2(file
->f_mapping
);
1639 return generic_file_mmap(file
, vma
);
1642 static int convert_fuse_file_lock(const struct fuse_file_lock
*ffl
,
1643 struct file_lock
*fl
)
1645 switch (ffl
->type
) {
1651 if (ffl
->start
> OFFSET_MAX
|| ffl
->end
> OFFSET_MAX
||
1652 ffl
->end
< ffl
->start
)
1655 fl
->fl_start
= ffl
->start
;
1656 fl
->fl_end
= ffl
->end
;
1657 fl
->fl_pid
= ffl
->pid
;
1663 fl
->fl_type
= ffl
->type
;
1667 static void fuse_lk_fill(struct fuse_req
*req
, struct file
*file
,
1668 const struct file_lock
*fl
, int opcode
, pid_t pid
,
1671 struct inode
*inode
= file_inode(file
);
1672 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1673 struct fuse_file
*ff
= file
->private_data
;
1674 struct fuse_lk_in
*arg
= &req
->misc
.lk_in
;
1677 arg
->owner
= fuse_lock_owner_id(fc
, fl
->fl_owner
);
1678 arg
->lk
.start
= fl
->fl_start
;
1679 arg
->lk
.end
= fl
->fl_end
;
1680 arg
->lk
.type
= fl
->fl_type
;
1683 arg
->lk_flags
|= FUSE_LK_FLOCK
;
1684 req
->in
.h
.opcode
= opcode
;
1685 req
->in
.h
.nodeid
= get_node_id(inode
);
1686 req
->in
.numargs
= 1;
1687 req
->in
.args
[0].size
= sizeof(*arg
);
1688 req
->in
.args
[0].value
= arg
;
1691 static int fuse_getlk(struct file
*file
, struct file_lock
*fl
)
1693 struct inode
*inode
= file_inode(file
);
1694 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1695 struct fuse_req
*req
;
1696 struct fuse_lk_out outarg
;
1699 req
= fuse_get_req_nopages(fc
);
1701 return PTR_ERR(req
);
1703 fuse_lk_fill(req
, file
, fl
, FUSE_GETLK
, 0, 0);
1704 req
->out
.numargs
= 1;
1705 req
->out
.args
[0].size
= sizeof(outarg
);
1706 req
->out
.args
[0].value
= &outarg
;
1707 fuse_request_send(fc
, req
);
1708 err
= req
->out
.h
.error
;
1709 fuse_put_request(fc
, req
);
1711 err
= convert_fuse_file_lock(&outarg
.lk
, fl
);
1716 static int fuse_setlk(struct file
*file
, struct file_lock
*fl
, int flock
)
1718 struct inode
*inode
= file_inode(file
);
1719 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1720 struct fuse_req
*req
;
1721 int opcode
= (fl
->fl_flags
& FL_SLEEP
) ? FUSE_SETLKW
: FUSE_SETLK
;
1722 pid_t pid
= fl
->fl_type
!= F_UNLCK
? current
->tgid
: 0;
1725 if (fl
->fl_lmops
&& fl
->fl_lmops
->lm_grant
) {
1726 /* NLM needs asynchronous locks, which we don't support yet */
1730 /* Unlock on close is handled by the flush method */
1731 if (fl
->fl_flags
& FL_CLOSE
)
1734 req
= fuse_get_req_nopages(fc
);
1736 return PTR_ERR(req
);
1738 fuse_lk_fill(req
, file
, fl
, opcode
, pid
, flock
);
1739 fuse_request_send(fc
, req
);
1740 err
= req
->out
.h
.error
;
1741 /* locking is restartable */
1744 fuse_put_request(fc
, req
);
1748 static int fuse_file_lock(struct file
*file
, int cmd
, struct file_lock
*fl
)
1750 struct inode
*inode
= file_inode(file
);
1751 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1754 if (cmd
== F_CANCELLK
) {
1756 } else if (cmd
== F_GETLK
) {
1758 posix_test_lock(file
, fl
);
1761 err
= fuse_getlk(file
, fl
);
1764 err
= posix_lock_file(file
, fl
, NULL
);
1766 err
= fuse_setlk(file
, fl
, 0);
1771 static int fuse_file_flock(struct file
*file
, int cmd
, struct file_lock
*fl
)
1773 struct inode
*inode
= file_inode(file
);
1774 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1778 err
= flock_lock_file_wait(file
, fl
);
1780 struct fuse_file
*ff
= file
->private_data
;
1782 /* emulate flock with POSIX locks */
1783 fl
->fl_owner
= (fl_owner_t
) file
;
1785 err
= fuse_setlk(file
, fl
, 1);
1791 static sector_t
fuse_bmap(struct address_space
*mapping
, sector_t block
)
1793 struct inode
*inode
= mapping
->host
;
1794 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1795 struct fuse_req
*req
;
1796 struct fuse_bmap_in inarg
;
1797 struct fuse_bmap_out outarg
;
1800 if (!inode
->i_sb
->s_bdev
|| fc
->no_bmap
)
1803 req
= fuse_get_req_nopages(fc
);
1807 memset(&inarg
, 0, sizeof(inarg
));
1808 inarg
.block
= block
;
1809 inarg
.blocksize
= inode
->i_sb
->s_blocksize
;
1810 req
->in
.h
.opcode
= FUSE_BMAP
;
1811 req
->in
.h
.nodeid
= get_node_id(inode
);
1812 req
->in
.numargs
= 1;
1813 req
->in
.args
[0].size
= sizeof(inarg
);
1814 req
->in
.args
[0].value
= &inarg
;
1815 req
->out
.numargs
= 1;
1816 req
->out
.args
[0].size
= sizeof(outarg
);
1817 req
->out
.args
[0].value
= &outarg
;
1818 fuse_request_send(fc
, req
);
1819 err
= req
->out
.h
.error
;
1820 fuse_put_request(fc
, req
);
1824 return err
? 0 : outarg
.block
;
1827 static loff_t
fuse_file_llseek(struct file
*file
, loff_t offset
, int whence
)
1830 struct inode
*inode
= file_inode(file
);
1832 /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */
1833 if (whence
== SEEK_CUR
|| whence
== SEEK_SET
)
1834 return generic_file_llseek(file
, offset
, whence
);
1836 mutex_lock(&inode
->i_mutex
);
1837 retval
= fuse_update_attributes(inode
, NULL
, file
, NULL
);
1839 retval
= generic_file_llseek(file
, offset
, whence
);
1840 mutex_unlock(&inode
->i_mutex
);
1845 static int fuse_ioctl_copy_user(struct page
**pages
, struct iovec
*iov
,
1846 unsigned int nr_segs
, size_t bytes
, bool to_user
)
1854 iov_iter_init(&ii
, iov
, nr_segs
, bytes
, 0);
1856 while (iov_iter_count(&ii
)) {
1857 struct page
*page
= pages
[page_idx
++];
1858 size_t todo
= min_t(size_t, PAGE_SIZE
, iov_iter_count(&ii
));
1864 char __user
*uaddr
= ii
.iov
->iov_base
+ ii
.iov_offset
;
1865 size_t iov_len
= ii
.iov
->iov_len
- ii
.iov_offset
;
1866 size_t copy
= min(todo
, iov_len
);
1870 left
= copy_from_user(kaddr
, uaddr
, copy
);
1872 left
= copy_to_user(uaddr
, kaddr
, copy
);
1877 iov_iter_advance(&ii
, copy
);
1889 * CUSE servers compiled on 32bit broke on 64bit kernels because the
1890 * ABI was defined to be 'struct iovec' which is different on 32bit
1891 * and 64bit. Fortunately we can determine which structure the server
1892 * used from the size of the reply.
1894 static int fuse_copy_ioctl_iovec_old(struct iovec
*dst
, void *src
,
1895 size_t transferred
, unsigned count
,
1898 #ifdef CONFIG_COMPAT
1899 if (count
* sizeof(struct compat_iovec
) == transferred
) {
1900 struct compat_iovec
*ciov
= src
;
1904 * With this interface a 32bit server cannot support
1905 * non-compat (i.e. ones coming from 64bit apps) ioctl
1911 for (i
= 0; i
< count
; i
++) {
1912 dst
[i
].iov_base
= compat_ptr(ciov
[i
].iov_base
);
1913 dst
[i
].iov_len
= ciov
[i
].iov_len
;
1919 if (count
* sizeof(struct iovec
) != transferred
)
1922 memcpy(dst
, src
, transferred
);
1926 /* Make sure iov_length() won't overflow */
1927 static int fuse_verify_ioctl_iov(struct iovec
*iov
, size_t count
)
1930 u32 max
= FUSE_MAX_PAGES_PER_REQ
<< PAGE_SHIFT
;
1932 for (n
= 0; n
< count
; n
++, iov
++) {
1933 if (iov
->iov_len
> (size_t) max
)
1935 max
-= iov
->iov_len
;
1940 static int fuse_copy_ioctl_iovec(struct fuse_conn
*fc
, struct iovec
*dst
,
1941 void *src
, size_t transferred
, unsigned count
,
1945 struct fuse_ioctl_iovec
*fiov
= src
;
1947 if (fc
->minor
< 16) {
1948 return fuse_copy_ioctl_iovec_old(dst
, src
, transferred
,
1952 if (count
* sizeof(struct fuse_ioctl_iovec
) != transferred
)
1955 for (i
= 0; i
< count
; i
++) {
1956 /* Did the server supply an inappropriate value? */
1957 if (fiov
[i
].base
!= (unsigned long) fiov
[i
].base
||
1958 fiov
[i
].len
!= (unsigned long) fiov
[i
].len
)
1961 dst
[i
].iov_base
= (void __user
*) (unsigned long) fiov
[i
].base
;
1962 dst
[i
].iov_len
= (size_t) fiov
[i
].len
;
1964 #ifdef CONFIG_COMPAT
1966 (ptr_to_compat(dst
[i
].iov_base
) != fiov
[i
].base
||
1967 (compat_size_t
) dst
[i
].iov_len
!= fiov
[i
].len
))
1977 * For ioctls, there is no generic way to determine how much memory
1978 * needs to be read and/or written. Furthermore, ioctls are allowed
1979 * to dereference the passed pointer, so the parameter requires deep
1980 * copying but FUSE has no idea whatsoever about what to copy in or
1983 * This is solved by allowing FUSE server to retry ioctl with
1984 * necessary in/out iovecs. Let's assume the ioctl implementation
1985 * needs to read in the following structure.
1992 * On the first callout to FUSE server, inarg->in_size and
1993 * inarg->out_size will be NULL; then, the server completes the ioctl
1994 * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and
1995 * the actual iov array to
1997 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } }
1999 * which tells FUSE to copy in the requested area and retry the ioctl.
2000 * On the second round, the server has access to the structure and
2001 * from that it can tell what to look for next, so on the invocation,
2002 * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to
2004 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) },
2005 * { .iov_base = a.buf, .iov_len = a.buflen } }
2007 * FUSE will copy both struct a and the pointed buffer from the
2008 * process doing the ioctl and retry ioctl with both struct a and the
2011 * This time, FUSE server has everything it needs and completes ioctl
2012 * without FUSE_IOCTL_RETRY which finishes the ioctl call.
2014 * Copying data out works the same way.
2016 * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel
2017 * automatically initializes in and out iovs by decoding @cmd with
2018 * _IOC_* macros and the server is not allowed to request RETRY. This
2019 * limits ioctl data transfers to well-formed ioctls and is the forced
2020 * behavior for all FUSE servers.
2022 long fuse_do_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
,
2025 struct fuse_file
*ff
= file
->private_data
;
2026 struct fuse_conn
*fc
= ff
->fc
;
2027 struct fuse_ioctl_in inarg
= {
2033 struct fuse_ioctl_out outarg
;
2034 struct fuse_req
*req
= NULL
;
2035 struct page
**pages
= NULL
;
2036 struct iovec
*iov_page
= NULL
;
2037 struct iovec
*in_iov
= NULL
, *out_iov
= NULL
;
2038 unsigned int in_iovs
= 0, out_iovs
= 0, num_pages
= 0, max_pages
;
2039 size_t in_size
, out_size
, transferred
;
2042 #if BITS_PER_LONG == 32
2043 inarg
.flags
|= FUSE_IOCTL_32BIT
;
2045 if (flags
& FUSE_IOCTL_COMPAT
)
2046 inarg
.flags
|= FUSE_IOCTL_32BIT
;
2049 /* assume all the iovs returned by client always fits in a page */
2050 BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec
) * FUSE_IOCTL_MAX_IOV
> PAGE_SIZE
);
2053 pages
= kcalloc(FUSE_MAX_PAGES_PER_REQ
, sizeof(pages
[0]), GFP_KERNEL
);
2054 iov_page
= (struct iovec
*) __get_free_page(GFP_KERNEL
);
2055 if (!pages
|| !iov_page
)
2059 * If restricted, initialize IO parameters as encoded in @cmd.
2060 * RETRY from server is not allowed.
2062 if (!(flags
& FUSE_IOCTL_UNRESTRICTED
)) {
2063 struct iovec
*iov
= iov_page
;
2065 iov
->iov_base
= (void __user
*)arg
;
2066 iov
->iov_len
= _IOC_SIZE(cmd
);
2068 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
2073 if (_IOC_DIR(cmd
) & _IOC_READ
) {
2080 inarg
.in_size
= in_size
= iov_length(in_iov
, in_iovs
);
2081 inarg
.out_size
= out_size
= iov_length(out_iov
, out_iovs
);
2084 * Out data can be used either for actual out data or iovs,
2085 * make sure there always is at least one page.
2087 out_size
= max_t(size_t, out_size
, PAGE_SIZE
);
2088 max_pages
= DIV_ROUND_UP(max(in_size
, out_size
), PAGE_SIZE
);
2090 /* make sure there are enough buffer pages and init request with them */
2092 if (max_pages
> FUSE_MAX_PAGES_PER_REQ
)
2094 while (num_pages
< max_pages
) {
2095 pages
[num_pages
] = alloc_page(GFP_KERNEL
| __GFP_HIGHMEM
);
2096 if (!pages
[num_pages
])
2101 req
= fuse_get_req(fc
, num_pages
);
2107 memcpy(req
->pages
, pages
, sizeof(req
->pages
[0]) * num_pages
);
2108 req
->num_pages
= num_pages
;
2109 fuse_page_descs_length_init(req
, 0, req
->num_pages
);
2111 /* okay, let's send it to the client */
2112 req
->in
.h
.opcode
= FUSE_IOCTL
;
2113 req
->in
.h
.nodeid
= ff
->nodeid
;
2114 req
->in
.numargs
= 1;
2115 req
->in
.args
[0].size
= sizeof(inarg
);
2116 req
->in
.args
[0].value
= &inarg
;
2119 req
->in
.args
[1].size
= in_size
;
2120 req
->in
.argpages
= 1;
2122 err
= fuse_ioctl_copy_user(pages
, in_iov
, in_iovs
, in_size
,
2128 req
->out
.numargs
= 2;
2129 req
->out
.args
[0].size
= sizeof(outarg
);
2130 req
->out
.args
[0].value
= &outarg
;
2131 req
->out
.args
[1].size
= out_size
;
2132 req
->out
.argpages
= 1;
2133 req
->out
.argvar
= 1;
2135 fuse_request_send(fc
, req
);
2136 err
= req
->out
.h
.error
;
2137 transferred
= req
->out
.args
[1].size
;
2138 fuse_put_request(fc
, req
);
2143 /* did it ask for retry? */
2144 if (outarg
.flags
& FUSE_IOCTL_RETRY
) {
2147 /* no retry if in restricted mode */
2149 if (!(flags
& FUSE_IOCTL_UNRESTRICTED
))
2152 in_iovs
= outarg
.in_iovs
;
2153 out_iovs
= outarg
.out_iovs
;
2156 * Make sure things are in boundary, separate checks
2157 * are to protect against overflow.
2160 if (in_iovs
> FUSE_IOCTL_MAX_IOV
||
2161 out_iovs
> FUSE_IOCTL_MAX_IOV
||
2162 in_iovs
+ out_iovs
> FUSE_IOCTL_MAX_IOV
)
2165 vaddr
= kmap_atomic(pages
[0]);
2166 err
= fuse_copy_ioctl_iovec(fc
, iov_page
, vaddr
,
2167 transferred
, in_iovs
+ out_iovs
,
2168 (flags
& FUSE_IOCTL_COMPAT
) != 0);
2169 kunmap_atomic(vaddr
);
2174 out_iov
= in_iov
+ in_iovs
;
2176 err
= fuse_verify_ioctl_iov(in_iov
, in_iovs
);
2180 err
= fuse_verify_ioctl_iov(out_iov
, out_iovs
);
2188 if (transferred
> inarg
.out_size
)
2191 err
= fuse_ioctl_copy_user(pages
, out_iov
, out_iovs
, transferred
, true);
2194 fuse_put_request(fc
, req
);
2195 free_page((unsigned long) iov_page
);
2197 __free_page(pages
[--num_pages
]);
2200 return err
? err
: outarg
.result
;
2202 EXPORT_SYMBOL_GPL(fuse_do_ioctl
);
2204 long fuse_ioctl_common(struct file
*file
, unsigned int cmd
,
2205 unsigned long arg
, unsigned int flags
)
2207 struct inode
*inode
= file_inode(file
);
2208 struct fuse_conn
*fc
= get_fuse_conn(inode
);
2210 if (!fuse_allow_current_process(fc
))
2213 if (is_bad_inode(inode
))
2216 return fuse_do_ioctl(file
, cmd
, arg
, flags
);
2219 static long fuse_file_ioctl(struct file
*file
, unsigned int cmd
,
2222 return fuse_ioctl_common(file
, cmd
, arg
, 0);
2225 static long fuse_file_compat_ioctl(struct file
*file
, unsigned int cmd
,
2228 return fuse_ioctl_common(file
, cmd
, arg
, FUSE_IOCTL_COMPAT
);
2232 * All files which have been polled are linked to RB tree
2233 * fuse_conn->polled_files which is indexed by kh. Walk the tree and
2234 * find the matching one.
2236 static struct rb_node
**fuse_find_polled_node(struct fuse_conn
*fc
, u64 kh
,
2237 struct rb_node
**parent_out
)
2239 struct rb_node
**link
= &fc
->polled_files
.rb_node
;
2240 struct rb_node
*last
= NULL
;
2243 struct fuse_file
*ff
;
2246 ff
= rb_entry(last
, struct fuse_file
, polled_node
);
2249 link
= &last
->rb_left
;
2250 else if (kh
> ff
->kh
)
2251 link
= &last
->rb_right
;
2262 * The file is about to be polled. Make sure it's on the polled_files
2263 * RB tree. Note that files once added to the polled_files tree are
2264 * not removed before the file is released. This is because a file
2265 * polled once is likely to be polled again.
2267 static void fuse_register_polled_file(struct fuse_conn
*fc
,
2268 struct fuse_file
*ff
)
2270 spin_lock(&fc
->lock
);
2271 if (RB_EMPTY_NODE(&ff
->polled_node
)) {
2272 struct rb_node
**link
, *parent
;
2274 link
= fuse_find_polled_node(fc
, ff
->kh
, &parent
);
2276 rb_link_node(&ff
->polled_node
, parent
, link
);
2277 rb_insert_color(&ff
->polled_node
, &fc
->polled_files
);
2279 spin_unlock(&fc
->lock
);
2282 unsigned fuse_file_poll(struct file
*file
, poll_table
*wait
)
2284 struct fuse_file
*ff
= file
->private_data
;
2285 struct fuse_conn
*fc
= ff
->fc
;
2286 struct fuse_poll_in inarg
= { .fh
= ff
->fh
, .kh
= ff
->kh
};
2287 struct fuse_poll_out outarg
;
2288 struct fuse_req
*req
;
2292 return DEFAULT_POLLMASK
;
2294 poll_wait(file
, &ff
->poll_wait
, wait
);
2295 inarg
.events
= (__u32
)poll_requested_events(wait
);
2298 * Ask for notification iff there's someone waiting for it.
2299 * The client may ignore the flag and always notify.
2301 if (waitqueue_active(&ff
->poll_wait
)) {
2302 inarg
.flags
|= FUSE_POLL_SCHEDULE_NOTIFY
;
2303 fuse_register_polled_file(fc
, ff
);
2306 req
= fuse_get_req_nopages(fc
);
2310 req
->in
.h
.opcode
= FUSE_POLL
;
2311 req
->in
.h
.nodeid
= ff
->nodeid
;
2312 req
->in
.numargs
= 1;
2313 req
->in
.args
[0].size
= sizeof(inarg
);
2314 req
->in
.args
[0].value
= &inarg
;
2315 req
->out
.numargs
= 1;
2316 req
->out
.args
[0].size
= sizeof(outarg
);
2317 req
->out
.args
[0].value
= &outarg
;
2318 fuse_request_send(fc
, req
);
2319 err
= req
->out
.h
.error
;
2320 fuse_put_request(fc
, req
);
2323 return outarg
.revents
;
2324 if (err
== -ENOSYS
) {
2326 return DEFAULT_POLLMASK
;
2330 EXPORT_SYMBOL_GPL(fuse_file_poll
);
2333 * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and
2334 * wakes up the poll waiters.
2336 int fuse_notify_poll_wakeup(struct fuse_conn
*fc
,
2337 struct fuse_notify_poll_wakeup_out
*outarg
)
2339 u64 kh
= outarg
->kh
;
2340 struct rb_node
**link
;
2342 spin_lock(&fc
->lock
);
2344 link
= fuse_find_polled_node(fc
, kh
, NULL
);
2346 struct fuse_file
*ff
;
2348 ff
= rb_entry(*link
, struct fuse_file
, polled_node
);
2349 wake_up_interruptible_sync(&ff
->poll_wait
);
2352 spin_unlock(&fc
->lock
);
2357 fuse_direct_IO(int rw
, struct kiocb
*iocb
, const struct iovec
*iov
,
2358 loff_t offset
, unsigned long nr_segs
)
2361 struct file
*file
= NULL
;
2363 struct fuse_io_priv
*io
;
2365 file
= iocb
->ki_filp
;
2368 io
= kzalloc(sizeof(struct fuse_io_priv
), GFP_KERNEL
);
2375 ret
= __fuse_direct_write(io
, iov
, nr_segs
, &pos
);
2377 ret
= __fuse_direct_read(io
, iov
, nr_segs
, &pos
);
2384 static long fuse_file_fallocate(struct file
*file
, int mode
, loff_t offset
,
2387 struct fuse_file
*ff
= file
->private_data
;
2388 struct fuse_conn
*fc
= ff
->fc
;
2389 struct fuse_req
*req
;
2390 struct fuse_fallocate_in inarg
= {
2398 if (fc
->no_fallocate
)
2401 req
= fuse_get_req_nopages(fc
);
2403 return PTR_ERR(req
);
2405 req
->in
.h
.opcode
= FUSE_FALLOCATE
;
2406 req
->in
.h
.nodeid
= ff
->nodeid
;
2407 req
->in
.numargs
= 1;
2408 req
->in
.args
[0].size
= sizeof(inarg
);
2409 req
->in
.args
[0].value
= &inarg
;
2410 fuse_request_send(fc
, req
);
2411 err
= req
->out
.h
.error
;
2412 if (err
== -ENOSYS
) {
2413 fc
->no_fallocate
= 1;
2416 fuse_put_request(fc
, req
);
2421 static const struct file_operations fuse_file_operations
= {
2422 .llseek
= fuse_file_llseek
,
2423 .read
= do_sync_read
,
2424 .aio_read
= fuse_file_aio_read
,
2425 .write
= do_sync_write
,
2426 .aio_write
= fuse_file_aio_write
,
2427 .mmap
= fuse_file_mmap
,
2429 .flush
= fuse_flush
,
2430 .release
= fuse_release
,
2431 .fsync
= fuse_fsync
,
2432 .lock
= fuse_file_lock
,
2433 .flock
= fuse_file_flock
,
2434 .splice_read
= generic_file_splice_read
,
2435 .unlocked_ioctl
= fuse_file_ioctl
,
2436 .compat_ioctl
= fuse_file_compat_ioctl
,
2437 .poll
= fuse_file_poll
,
2438 .fallocate
= fuse_file_fallocate
,
2441 static const struct file_operations fuse_direct_io_file_operations
= {
2442 .llseek
= fuse_file_llseek
,
2443 .read
= fuse_direct_read
,
2444 .write
= fuse_direct_write
,
2445 .mmap
= fuse_direct_mmap
,
2447 .flush
= fuse_flush
,
2448 .release
= fuse_release
,
2449 .fsync
= fuse_fsync
,
2450 .lock
= fuse_file_lock
,
2451 .flock
= fuse_file_flock
,
2452 .unlocked_ioctl
= fuse_file_ioctl
,
2453 .compat_ioctl
= fuse_file_compat_ioctl
,
2454 .poll
= fuse_file_poll
,
2455 .fallocate
= fuse_file_fallocate
,
2456 /* no splice_read */
2459 static const struct address_space_operations fuse_file_aops
= {
2460 .readpage
= fuse_readpage
,
2461 .writepage
= fuse_writepage
,
2462 .launder_page
= fuse_launder_page
,
2463 .readpages
= fuse_readpages
,
2464 .set_page_dirty
= __set_page_dirty_nobuffers
,
2466 .direct_IO
= fuse_direct_IO
,
2469 void fuse_init_file_inode(struct inode
*inode
)
2471 inode
->i_fop
= &fuse_file_operations
;
2472 inode
->i_data
.a_ops
= &fuse_file_aops
;