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>
18 #include <linux/aio.h>
19 #include <linux/falloc.h>
21 static const struct file_operations fuse_direct_io_file_operations
;
23 static int fuse_send_open(struct fuse_conn
*fc
, u64 nodeid
, struct file
*file
,
24 int opcode
, struct fuse_open_out
*outargp
)
26 struct fuse_open_in inarg
;
30 req
= fuse_get_req_nopages(fc
);
34 memset(&inarg
, 0, sizeof(inarg
));
35 inarg
.flags
= file
->f_flags
& ~(O_CREAT
| O_EXCL
| O_NOCTTY
);
36 if (!fc
->atomic_o_trunc
)
37 inarg
.flags
&= ~O_TRUNC
;
38 req
->in
.h
.opcode
= opcode
;
39 req
->in
.h
.nodeid
= nodeid
;
41 req
->in
.args
[0].size
= sizeof(inarg
);
42 req
->in
.args
[0].value
= &inarg
;
44 req
->out
.args
[0].size
= sizeof(*outargp
);
45 req
->out
.args
[0].value
= outargp
;
46 fuse_request_send(fc
, req
);
47 err
= req
->out
.h
.error
;
48 fuse_put_request(fc
, req
);
53 struct fuse_file
*fuse_file_alloc(struct fuse_conn
*fc
)
57 ff
= kmalloc(sizeof(struct fuse_file
), GFP_KERNEL
);
62 ff
->reserved_req
= fuse_request_alloc(0);
63 if (unlikely(!ff
->reserved_req
)) {
68 INIT_LIST_HEAD(&ff
->write_entry
);
69 atomic_set(&ff
->count
, 0);
70 RB_CLEAR_NODE(&ff
->polled_node
);
71 init_waitqueue_head(&ff
->poll_wait
);
75 spin_unlock(&fc
->lock
);
80 void fuse_file_free(struct fuse_file
*ff
)
82 fuse_request_free(ff
->reserved_req
);
86 struct fuse_file
*fuse_file_get(struct fuse_file
*ff
)
88 atomic_inc(&ff
->count
);
92 static void fuse_release_async(struct work_struct
*work
)
98 req
= container_of(work
, struct fuse_req
, misc
.release
.work
);
99 path
= req
->misc
.release
.path
;
100 fc
= get_fuse_conn(path
.dentry
->d_inode
);
102 fuse_put_request(fc
, req
);
106 static void fuse_release_end(struct fuse_conn
*fc
, struct fuse_req
*req
)
108 if (fc
->destroy_req
) {
110 * If this is a fuseblk mount, then it's possible that
111 * releasing the path will result in releasing the
112 * super block and sending the DESTROY request. If
113 * the server is single threaded, this would hang.
114 * For this reason do the path_put() in a separate
117 atomic_inc(&req
->count
);
118 INIT_WORK(&req
->misc
.release
.work
, fuse_release_async
);
119 schedule_work(&req
->misc
.release
.work
);
121 path_put(&req
->misc
.release
.path
);
125 static void fuse_file_put(struct fuse_file
*ff
, bool sync
)
127 if (atomic_dec_and_test(&ff
->count
)) {
128 struct fuse_req
*req
= ff
->reserved_req
;
132 fuse_request_send(ff
->fc
, req
);
133 path_put(&req
->misc
.release
.path
);
134 fuse_put_request(ff
->fc
, req
);
136 req
->end
= fuse_release_end
;
138 fuse_request_send_background(ff
->fc
, req
);
144 int fuse_do_open(struct fuse_conn
*fc
, u64 nodeid
, struct file
*file
,
147 struct fuse_open_out outarg
;
148 struct fuse_file
*ff
;
150 int opcode
= isdir
? FUSE_OPENDIR
: FUSE_OPEN
;
152 ff
= fuse_file_alloc(fc
);
156 err
= fuse_send_open(fc
, nodeid
, file
, opcode
, &outarg
);
163 outarg
.open_flags
&= ~FOPEN_DIRECT_IO
;
167 ff
->open_flags
= outarg
.open_flags
;
168 file
->private_data
= fuse_file_get(ff
);
172 EXPORT_SYMBOL_GPL(fuse_do_open
);
174 void fuse_finish_open(struct inode
*inode
, struct file
*file
)
176 struct fuse_file
*ff
= file
->private_data
;
177 struct fuse_conn
*fc
= get_fuse_conn(inode
);
179 if (ff
->open_flags
& FOPEN_DIRECT_IO
)
180 file
->f_op
= &fuse_direct_io_file_operations
;
181 if (!(ff
->open_flags
& FOPEN_KEEP_CACHE
))
182 invalidate_inode_pages2(inode
->i_mapping
);
183 if (ff
->open_flags
& FOPEN_NONSEEKABLE
)
184 nonseekable_open(inode
, file
);
185 if (fc
->atomic_o_trunc
&& (file
->f_flags
& O_TRUNC
)) {
186 struct fuse_inode
*fi
= get_fuse_inode(inode
);
188 spin_lock(&fc
->lock
);
189 fi
->attr_version
= ++fc
->attr_version
;
190 i_size_write(inode
, 0);
191 spin_unlock(&fc
->lock
);
192 fuse_invalidate_attr(inode
);
196 int fuse_open_common(struct inode
*inode
, struct file
*file
, bool isdir
)
198 struct fuse_conn
*fc
= get_fuse_conn(inode
);
201 err
= generic_file_open(inode
, file
);
205 err
= fuse_do_open(fc
, get_node_id(inode
), file
, isdir
);
209 fuse_finish_open(inode
, file
);
214 static void fuse_prepare_release(struct fuse_file
*ff
, int flags
, int opcode
)
216 struct fuse_conn
*fc
= ff
->fc
;
217 struct fuse_req
*req
= ff
->reserved_req
;
218 struct fuse_release_in
*inarg
= &req
->misc
.release
.in
;
220 spin_lock(&fc
->lock
);
221 list_del(&ff
->write_entry
);
222 if (!RB_EMPTY_NODE(&ff
->polled_node
))
223 rb_erase(&ff
->polled_node
, &fc
->polled_files
);
224 spin_unlock(&fc
->lock
);
226 wake_up_interruptible_all(&ff
->poll_wait
);
229 inarg
->flags
= flags
;
230 req
->in
.h
.opcode
= opcode
;
231 req
->in
.h
.nodeid
= ff
->nodeid
;
233 req
->in
.args
[0].size
= sizeof(struct fuse_release_in
);
234 req
->in
.args
[0].value
= inarg
;
237 void fuse_release_common(struct file
*file
, int opcode
)
239 struct fuse_file
*ff
;
240 struct fuse_req
*req
;
242 ff
= file
->private_data
;
246 req
= ff
->reserved_req
;
247 fuse_prepare_release(ff
, file
->f_flags
, opcode
);
250 struct fuse_release_in
*inarg
= &req
->misc
.release
.in
;
251 inarg
->release_flags
|= FUSE_RELEASE_FLOCK_UNLOCK
;
252 inarg
->lock_owner
= fuse_lock_owner_id(ff
->fc
,
255 /* Hold vfsmount and dentry until release is finished */
256 path_get(&file
->f_path
);
257 req
->misc
.release
.path
= file
->f_path
;
260 * Normally this will send the RELEASE request, however if
261 * some asynchronous READ or WRITE requests are outstanding,
262 * the sending will be delayed.
264 * Make the release synchronous if this is a fuseblk mount,
265 * synchronous RELEASE is allowed (and desirable) in this case
266 * because the server can be trusted not to screw up.
268 fuse_file_put(ff
, ff
->fc
->destroy_req
!= NULL
);
271 static int fuse_open(struct inode
*inode
, struct file
*file
)
273 return fuse_open_common(inode
, file
, false);
276 static int fuse_release(struct inode
*inode
, struct file
*file
)
278 fuse_release_common(file
, FUSE_RELEASE
);
280 /* return value is ignored by VFS */
284 void fuse_sync_release(struct fuse_file
*ff
, int flags
)
286 WARN_ON(atomic_read(&ff
->count
) > 1);
287 fuse_prepare_release(ff
, flags
, FUSE_RELEASE
);
288 ff
->reserved_req
->force
= 1;
289 ff
->reserved_req
->background
= 0;
290 fuse_request_send(ff
->fc
, ff
->reserved_req
);
291 fuse_put_request(ff
->fc
, ff
->reserved_req
);
294 EXPORT_SYMBOL_GPL(fuse_sync_release
);
297 * Scramble the ID space with XTEA, so that the value of the files_struct
298 * pointer is not exposed to userspace.
300 u64
fuse_lock_owner_id(struct fuse_conn
*fc
, fl_owner_t id
)
302 u32
*k
= fc
->scramble_key
;
303 u64 v
= (unsigned long) id
;
309 for (i
= 0; i
< 32; i
++) {
310 v0
+= ((v1
<< 4 ^ v1
>> 5) + v1
) ^ (sum
+ k
[sum
& 3]);
312 v1
+= ((v0
<< 4 ^ v0
>> 5) + v0
) ^ (sum
+ k
[sum
>>11 & 3]);
315 return (u64
) v0
+ ((u64
) v1
<< 32);
319 * Check if page is under writeback
321 * This is currently done by walking the list of writepage requests
322 * for the inode, which can be pretty inefficient.
324 static bool fuse_page_is_writeback(struct inode
*inode
, pgoff_t index
)
326 struct fuse_conn
*fc
= get_fuse_conn(inode
);
327 struct fuse_inode
*fi
= get_fuse_inode(inode
);
328 struct fuse_req
*req
;
331 spin_lock(&fc
->lock
);
332 list_for_each_entry(req
, &fi
->writepages
, writepages_entry
) {
335 BUG_ON(req
->inode
!= inode
);
336 curr_index
= req
->misc
.write
.in
.offset
>> PAGE_CACHE_SHIFT
;
337 if (curr_index
== index
) {
342 spin_unlock(&fc
->lock
);
348 * Wait for page writeback to be completed.
350 * Since fuse doesn't rely on the VM writeback tracking, this has to
351 * use some other means.
353 static int fuse_wait_on_page_writeback(struct inode
*inode
, pgoff_t index
)
355 struct fuse_inode
*fi
= get_fuse_inode(inode
);
357 wait_event(fi
->page_waitq
, !fuse_page_is_writeback(inode
, index
));
361 static int fuse_flush(struct file
*file
, fl_owner_t id
)
363 struct inode
*inode
= file_inode(file
);
364 struct fuse_conn
*fc
= get_fuse_conn(inode
);
365 struct fuse_file
*ff
= file
->private_data
;
366 struct fuse_req
*req
;
367 struct fuse_flush_in inarg
;
370 if (is_bad_inode(inode
))
376 req
= fuse_get_req_nofail_nopages(fc
, file
);
377 memset(&inarg
, 0, sizeof(inarg
));
379 inarg
.lock_owner
= fuse_lock_owner_id(fc
, id
);
380 req
->in
.h
.opcode
= FUSE_FLUSH
;
381 req
->in
.h
.nodeid
= get_node_id(inode
);
383 req
->in
.args
[0].size
= sizeof(inarg
);
384 req
->in
.args
[0].value
= &inarg
;
386 fuse_request_send(fc
, req
);
387 err
= req
->out
.h
.error
;
388 fuse_put_request(fc
, req
);
389 if (err
== -ENOSYS
) {
397 * Wait for all pending writepages on the inode to finish.
399 * This is currently done by blocking further writes with FUSE_NOWRITE
400 * and waiting for all sent writes to complete.
402 * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage
403 * could conflict with truncation.
405 static void fuse_sync_writes(struct inode
*inode
)
407 fuse_set_nowrite(inode
);
408 fuse_release_nowrite(inode
);
411 int fuse_fsync_common(struct file
*file
, loff_t start
, loff_t end
,
412 int datasync
, int isdir
)
414 struct inode
*inode
= file
->f_mapping
->host
;
415 struct fuse_conn
*fc
= get_fuse_conn(inode
);
416 struct fuse_file
*ff
= file
->private_data
;
417 struct fuse_req
*req
;
418 struct fuse_fsync_in inarg
;
421 if (is_bad_inode(inode
))
424 err
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
428 if ((!isdir
&& fc
->no_fsync
) || (isdir
&& fc
->no_fsyncdir
))
431 mutex_lock(&inode
->i_mutex
);
434 * Start writeback against all dirty pages of the inode, then
435 * wait for all outstanding writes, before sending the FSYNC
438 err
= write_inode_now(inode
, 0);
442 fuse_sync_writes(inode
);
444 req
= fuse_get_req_nopages(fc
);
450 memset(&inarg
, 0, sizeof(inarg
));
452 inarg
.fsync_flags
= datasync
? 1 : 0;
453 req
->in
.h
.opcode
= isdir
? FUSE_FSYNCDIR
: FUSE_FSYNC
;
454 req
->in
.h
.nodeid
= get_node_id(inode
);
456 req
->in
.args
[0].size
= sizeof(inarg
);
457 req
->in
.args
[0].value
= &inarg
;
458 fuse_request_send(fc
, req
);
459 err
= req
->out
.h
.error
;
460 fuse_put_request(fc
, req
);
461 if (err
== -ENOSYS
) {
469 mutex_unlock(&inode
->i_mutex
);
473 static int fuse_fsync(struct file
*file
, loff_t start
, loff_t end
,
476 return fuse_fsync_common(file
, start
, end
, datasync
, 0);
479 void fuse_read_fill(struct fuse_req
*req
, struct file
*file
, loff_t pos
,
480 size_t count
, int opcode
)
482 struct fuse_read_in
*inarg
= &req
->misc
.read
.in
;
483 struct fuse_file
*ff
= file
->private_data
;
488 inarg
->flags
= file
->f_flags
;
489 req
->in
.h
.opcode
= opcode
;
490 req
->in
.h
.nodeid
= ff
->nodeid
;
492 req
->in
.args
[0].size
= sizeof(struct fuse_read_in
);
493 req
->in
.args
[0].value
= inarg
;
495 req
->out
.numargs
= 1;
496 req
->out
.args
[0].size
= count
;
499 static void fuse_release_user_pages(struct fuse_req
*req
, int write
)
503 for (i
= 0; i
< req
->num_pages
; i
++) {
504 struct page
*page
= req
->pages
[i
];
506 set_page_dirty_lock(page
);
512 * In case of short read, the caller sets 'pos' to the position of
513 * actual end of fuse request in IO request. Otherwise, if bytes_requested
514 * == bytes_transferred or rw == WRITE, the caller sets 'pos' to -1.
517 * User requested DIO read of 64K. It was splitted into two 32K fuse requests,
518 * both submitted asynchronously. The first of them was ACKed by userspace as
519 * fully completed (req->out.args[0].size == 32K) resulting in pos == -1. The
520 * second request was ACKed as short, e.g. only 1K was read, resulting in
523 * Thus, when all fuse requests are completed, the minimal non-negative 'pos'
524 * will be equal to the length of the longest contiguous fragment of
525 * transferred data starting from the beginning of IO request.
527 static void fuse_aio_complete(struct fuse_io_priv
*io
, int err
, ssize_t pos
)
531 spin_lock(&io
->lock
);
533 io
->err
= io
->err
? : err
;
534 else if (pos
>= 0 && (io
->bytes
< 0 || pos
< io
->bytes
))
538 spin_unlock(&io
->lock
);
545 else if (io
->bytes
>= 0 && io
->write
)
548 res
= io
->bytes
< 0 ? io
->size
: io
->bytes
;
550 if (!is_sync_kiocb(io
->iocb
)) {
551 struct path
*path
= &io
->iocb
->ki_filp
->f_path
;
552 struct inode
*inode
= path
->dentry
->d_inode
;
553 struct fuse_conn
*fc
= get_fuse_conn(inode
);
554 struct fuse_inode
*fi
= get_fuse_inode(inode
);
556 spin_lock(&fc
->lock
);
557 fi
->attr_version
= ++fc
->attr_version
;
558 spin_unlock(&fc
->lock
);
562 aio_complete(io
->iocb
, res
, 0);
567 static void fuse_aio_complete_req(struct fuse_conn
*fc
, struct fuse_req
*req
)
569 struct fuse_io_priv
*io
= req
->io
;
572 fuse_release_user_pages(req
, !io
->write
);
575 if (req
->misc
.write
.in
.size
!= req
->misc
.write
.out
.size
)
576 pos
= req
->misc
.write
.in
.offset
- io
->offset
+
577 req
->misc
.write
.out
.size
;
579 if (req
->misc
.read
.in
.size
!= req
->out
.args
[0].size
)
580 pos
= req
->misc
.read
.in
.offset
- io
->offset
+
581 req
->out
.args
[0].size
;
584 fuse_aio_complete(io
, req
->out
.h
.error
, pos
);
587 static size_t fuse_async_req_send(struct fuse_conn
*fc
, struct fuse_req
*req
,
588 size_t num_bytes
, struct fuse_io_priv
*io
)
590 spin_lock(&io
->lock
);
591 io
->size
+= num_bytes
;
593 spin_unlock(&io
->lock
);
596 req
->end
= fuse_aio_complete_req
;
598 __fuse_get_request(req
);
599 fuse_request_send_background(fc
, req
);
604 static size_t fuse_send_read(struct fuse_req
*req
, struct fuse_io_priv
*io
,
605 loff_t pos
, size_t count
, fl_owner_t owner
)
607 struct file
*file
= io
->file
;
608 struct fuse_file
*ff
= file
->private_data
;
609 struct fuse_conn
*fc
= ff
->fc
;
611 fuse_read_fill(req
, file
, pos
, count
, FUSE_READ
);
613 struct fuse_read_in
*inarg
= &req
->misc
.read
.in
;
615 inarg
->read_flags
|= FUSE_READ_LOCKOWNER
;
616 inarg
->lock_owner
= fuse_lock_owner_id(fc
, owner
);
620 return fuse_async_req_send(fc
, req
, count
, io
);
622 fuse_request_send(fc
, req
);
623 return req
->out
.args
[0].size
;
626 static void fuse_read_update_size(struct inode
*inode
, loff_t size
,
629 struct fuse_conn
*fc
= get_fuse_conn(inode
);
630 struct fuse_inode
*fi
= get_fuse_inode(inode
);
632 spin_lock(&fc
->lock
);
633 if (attr_ver
== fi
->attr_version
&& size
< inode
->i_size
) {
634 fi
->attr_version
= ++fc
->attr_version
;
635 i_size_write(inode
, size
);
637 spin_unlock(&fc
->lock
);
640 static int fuse_readpage(struct file
*file
, struct page
*page
)
642 struct fuse_io_priv io
= { .async
= 0, .file
= file
};
643 struct inode
*inode
= page
->mapping
->host
;
644 struct fuse_conn
*fc
= get_fuse_conn(inode
);
645 struct fuse_req
*req
;
647 loff_t pos
= page_offset(page
);
648 size_t count
= PAGE_CACHE_SIZE
;
653 if (is_bad_inode(inode
))
657 * Page writeback can extend beyond the lifetime of the
658 * page-cache page, so make sure we read a properly synced
661 fuse_wait_on_page_writeback(inode
, page
->index
);
663 req
= fuse_get_req(fc
, 1);
668 attr_ver
= fuse_get_attr_version(fc
);
670 req
->out
.page_zeroing
= 1;
671 req
->out
.argpages
= 1;
673 req
->pages
[0] = page
;
674 req
->page_descs
[0].length
= count
;
675 num_read
= fuse_send_read(req
, &io
, pos
, count
, NULL
);
676 err
= req
->out
.h
.error
;
677 fuse_put_request(fc
, req
);
681 * Short read means EOF. If file size is larger, truncate it
683 if (num_read
< count
)
684 fuse_read_update_size(inode
, pos
+ num_read
, attr_ver
);
686 SetPageUptodate(page
);
689 fuse_invalidate_attr(inode
); /* atime changed */
695 static void fuse_readpages_end(struct fuse_conn
*fc
, struct fuse_req
*req
)
698 size_t count
= req
->misc
.read
.in
.size
;
699 size_t num_read
= req
->out
.args
[0].size
;
700 struct address_space
*mapping
= NULL
;
702 for (i
= 0; mapping
== NULL
&& i
< req
->num_pages
; i
++)
703 mapping
= req
->pages
[i
]->mapping
;
706 struct inode
*inode
= mapping
->host
;
709 * Short read means EOF. If file size is larger, truncate it
711 if (!req
->out
.h
.error
&& num_read
< count
) {
714 pos
= page_offset(req
->pages
[0]) + num_read
;
715 fuse_read_update_size(inode
, pos
,
716 req
->misc
.read
.attr_ver
);
718 fuse_invalidate_attr(inode
); /* atime changed */
721 for (i
= 0; i
< req
->num_pages
; i
++) {
722 struct page
*page
= req
->pages
[i
];
723 if (!req
->out
.h
.error
)
724 SetPageUptodate(page
);
728 page_cache_release(page
);
731 fuse_file_put(req
->ff
, false);
734 static void fuse_send_readpages(struct fuse_req
*req
, struct file
*file
)
736 struct fuse_file
*ff
= file
->private_data
;
737 struct fuse_conn
*fc
= ff
->fc
;
738 loff_t pos
= page_offset(req
->pages
[0]);
739 size_t count
= req
->num_pages
<< PAGE_CACHE_SHIFT
;
741 req
->out
.argpages
= 1;
742 req
->out
.page_zeroing
= 1;
743 req
->out
.page_replace
= 1;
744 fuse_read_fill(req
, file
, pos
, count
, FUSE_READ
);
745 req
->misc
.read
.attr_ver
= fuse_get_attr_version(fc
);
746 if (fc
->async_read
) {
747 req
->ff
= fuse_file_get(ff
);
748 req
->end
= fuse_readpages_end
;
749 fuse_request_send_background(fc
, req
);
751 fuse_request_send(fc
, req
);
752 fuse_readpages_end(fc
, req
);
753 fuse_put_request(fc
, req
);
757 struct fuse_fill_data
{
758 struct fuse_req
*req
;
764 static int fuse_readpages_fill(void *_data
, struct page
*page
)
766 struct fuse_fill_data
*data
= _data
;
767 struct fuse_req
*req
= data
->req
;
768 struct inode
*inode
= data
->inode
;
769 struct fuse_conn
*fc
= get_fuse_conn(inode
);
771 fuse_wait_on_page_writeback(inode
, page
->index
);
773 if (req
->num_pages
&&
774 (req
->num_pages
== FUSE_MAX_PAGES_PER_REQ
||
775 (req
->num_pages
+ 1) * PAGE_CACHE_SIZE
> fc
->max_read
||
776 req
->pages
[req
->num_pages
- 1]->index
+ 1 != page
->index
)) {
777 int nr_alloc
= min_t(unsigned, data
->nr_pages
,
778 FUSE_MAX_PAGES_PER_REQ
);
779 fuse_send_readpages(req
, data
->file
);
781 req
= fuse_get_req_for_background(fc
, nr_alloc
);
783 req
= fuse_get_req(fc
, nr_alloc
);
792 if (WARN_ON(req
->num_pages
>= req
->max_pages
)) {
793 fuse_put_request(fc
, req
);
797 page_cache_get(page
);
798 req
->pages
[req
->num_pages
] = page
;
799 req
->page_descs
[req
->num_pages
].length
= PAGE_SIZE
;
805 static int fuse_readpages(struct file
*file
, struct address_space
*mapping
,
806 struct list_head
*pages
, unsigned nr_pages
)
808 struct inode
*inode
= mapping
->host
;
809 struct fuse_conn
*fc
= get_fuse_conn(inode
);
810 struct fuse_fill_data data
;
812 int nr_alloc
= min_t(unsigned, nr_pages
, FUSE_MAX_PAGES_PER_REQ
);
815 if (is_bad_inode(inode
))
821 data
.req
= fuse_get_req_for_background(fc
, nr_alloc
);
823 data
.req
= fuse_get_req(fc
, nr_alloc
);
824 data
.nr_pages
= nr_pages
;
825 err
= PTR_ERR(data
.req
);
826 if (IS_ERR(data
.req
))
829 err
= read_cache_pages(mapping
, pages
, fuse_readpages_fill
, &data
);
831 if (data
.req
->num_pages
)
832 fuse_send_readpages(data
.req
, file
);
834 fuse_put_request(fc
, data
.req
);
840 static ssize_t
fuse_file_aio_read(struct kiocb
*iocb
, const struct iovec
*iov
,
841 unsigned long nr_segs
, loff_t pos
)
843 struct inode
*inode
= iocb
->ki_filp
->f_mapping
->host
;
844 struct fuse_conn
*fc
= get_fuse_conn(inode
);
847 * In auto invalidate mode, always update attributes on read.
848 * Otherwise, only update if we attempt to read past EOF (to ensure
849 * i_size is up to date).
851 if (fc
->auto_inval_data
||
852 (pos
+ iov_length(iov
, nr_segs
) > i_size_read(inode
))) {
854 err
= fuse_update_attributes(inode
, NULL
, iocb
->ki_filp
, NULL
);
859 return generic_file_aio_read(iocb
, iov
, nr_segs
, pos
);
862 static void fuse_write_fill(struct fuse_req
*req
, struct fuse_file
*ff
,
863 loff_t pos
, size_t count
)
865 struct fuse_write_in
*inarg
= &req
->misc
.write
.in
;
866 struct fuse_write_out
*outarg
= &req
->misc
.write
.out
;
871 req
->in
.h
.opcode
= FUSE_WRITE
;
872 req
->in
.h
.nodeid
= ff
->nodeid
;
874 if (ff
->fc
->minor
< 9)
875 req
->in
.args
[0].size
= FUSE_COMPAT_WRITE_IN_SIZE
;
877 req
->in
.args
[0].size
= sizeof(struct fuse_write_in
);
878 req
->in
.args
[0].value
= inarg
;
879 req
->in
.args
[1].size
= count
;
880 req
->out
.numargs
= 1;
881 req
->out
.args
[0].size
= sizeof(struct fuse_write_out
);
882 req
->out
.args
[0].value
= outarg
;
885 static size_t fuse_send_write(struct fuse_req
*req
, struct fuse_io_priv
*io
,
886 loff_t pos
, size_t count
, fl_owner_t owner
)
888 struct file
*file
= io
->file
;
889 struct fuse_file
*ff
= file
->private_data
;
890 struct fuse_conn
*fc
= ff
->fc
;
891 struct fuse_write_in
*inarg
= &req
->misc
.write
.in
;
893 fuse_write_fill(req
, ff
, pos
, count
);
894 inarg
->flags
= file
->f_flags
;
896 inarg
->write_flags
|= FUSE_WRITE_LOCKOWNER
;
897 inarg
->lock_owner
= fuse_lock_owner_id(fc
, owner
);
901 return fuse_async_req_send(fc
, req
, count
, io
);
903 fuse_request_send(fc
, req
);
904 return req
->misc
.write
.out
.size
;
907 void fuse_write_update_size(struct inode
*inode
, loff_t pos
)
909 struct fuse_conn
*fc
= get_fuse_conn(inode
);
910 struct fuse_inode
*fi
= get_fuse_inode(inode
);
912 spin_lock(&fc
->lock
);
913 fi
->attr_version
= ++fc
->attr_version
;
914 if (pos
> inode
->i_size
)
915 i_size_write(inode
, pos
);
916 spin_unlock(&fc
->lock
);
919 static size_t fuse_send_write_pages(struct fuse_req
*req
, struct file
*file
,
920 struct inode
*inode
, loff_t pos
,
926 struct fuse_io_priv io
= { .async
= 0, .file
= file
};
928 for (i
= 0; i
< req
->num_pages
; i
++)
929 fuse_wait_on_page_writeback(inode
, req
->pages
[i
]->index
);
931 res
= fuse_send_write(req
, &io
, pos
, count
, NULL
);
933 offset
= req
->page_descs
[0].offset
;
935 for (i
= 0; i
< req
->num_pages
; i
++) {
936 struct page
*page
= req
->pages
[i
];
938 if (!req
->out
.h
.error
&& !offset
&& count
>= PAGE_CACHE_SIZE
)
939 SetPageUptodate(page
);
941 if (count
> PAGE_CACHE_SIZE
- offset
)
942 count
-= PAGE_CACHE_SIZE
- offset
;
948 page_cache_release(page
);
954 static ssize_t
fuse_fill_write_pages(struct fuse_req
*req
,
955 struct address_space
*mapping
,
956 struct iov_iter
*ii
, loff_t pos
)
958 struct fuse_conn
*fc
= get_fuse_conn(mapping
->host
);
959 unsigned offset
= pos
& (PAGE_CACHE_SIZE
- 1);
963 req
->in
.argpages
= 1;
964 req
->page_descs
[0].offset
= offset
;
969 pgoff_t index
= pos
>> PAGE_CACHE_SHIFT
;
970 size_t bytes
= min_t(size_t, PAGE_CACHE_SIZE
- offset
,
973 bytes
= min_t(size_t, bytes
, fc
->max_write
- count
);
977 if (iov_iter_fault_in_readable(ii
, bytes
))
981 page
= grab_cache_page_write_begin(mapping
, index
, 0);
985 if (mapping_writably_mapped(mapping
))
986 flush_dcache_page(page
);
989 tmp
= iov_iter_copy_from_user_atomic(page
, ii
, offset
, bytes
);
991 flush_dcache_page(page
);
993 mark_page_accessed(page
);
997 page_cache_release(page
);
998 bytes
= min(bytes
, iov_iter_single_seg_count(ii
));
1003 req
->pages
[req
->num_pages
] = page
;
1004 req
->page_descs
[req
->num_pages
].length
= tmp
;
1007 iov_iter_advance(ii
, tmp
);
1011 if (offset
== PAGE_CACHE_SIZE
)
1014 if (!fc
->big_writes
)
1016 } while (iov_iter_count(ii
) && count
< fc
->max_write
&&
1017 req
->num_pages
< req
->max_pages
&& offset
== 0);
1019 return count
> 0 ? count
: err
;
1022 static inline unsigned fuse_wr_pages(loff_t pos
, size_t len
)
1024 return min_t(unsigned,
1025 ((pos
+ len
- 1) >> PAGE_CACHE_SHIFT
) -
1026 (pos
>> PAGE_CACHE_SHIFT
) + 1,
1027 FUSE_MAX_PAGES_PER_REQ
);
1030 static ssize_t
fuse_perform_write(struct file
*file
,
1031 struct address_space
*mapping
,
1032 struct iov_iter
*ii
, loff_t pos
)
1034 struct inode
*inode
= mapping
->host
;
1035 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1039 if (is_bad_inode(inode
))
1043 struct fuse_req
*req
;
1045 unsigned nr_pages
= fuse_wr_pages(pos
, iov_iter_count(ii
));
1047 req
= fuse_get_req(fc
, nr_pages
);
1053 count
= fuse_fill_write_pages(req
, mapping
, ii
, pos
);
1059 num_written
= fuse_send_write_pages(req
, file
, inode
,
1061 err
= req
->out
.h
.error
;
1066 /* break out of the loop on short write */
1067 if (num_written
!= count
)
1071 fuse_put_request(fc
, req
);
1072 } while (!err
&& iov_iter_count(ii
));
1075 fuse_write_update_size(inode
, pos
);
1077 fuse_invalidate_attr(inode
);
1079 return res
> 0 ? res
: err
;
1082 static ssize_t
fuse_file_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
1083 unsigned long nr_segs
, loff_t pos
)
1085 struct file
*file
= iocb
->ki_filp
;
1086 struct address_space
*mapping
= file
->f_mapping
;
1089 ssize_t written
= 0;
1090 ssize_t written_buffered
= 0;
1091 struct inode
*inode
= mapping
->host
;
1096 WARN_ON(iocb
->ki_pos
!= pos
);
1099 err
= generic_segment_checks(iov
, &nr_segs
, &ocount
, VERIFY_READ
);
1104 mutex_lock(&inode
->i_mutex
);
1106 /* We can write back this queue in page reclaim */
1107 current
->backing_dev_info
= mapping
->backing_dev_info
;
1109 err
= generic_write_checks(file
, &pos
, &count
, S_ISBLK(inode
->i_mode
));
1116 err
= file_remove_suid(file
);
1120 err
= file_update_time(file
);
1124 if (file
->f_flags
& O_DIRECT
) {
1125 written
= generic_file_direct_write(iocb
, iov
, &nr_segs
,
1128 if (written
< 0 || written
== count
)
1134 iov_iter_init(&i
, iov
, nr_segs
, count
, written
);
1135 written_buffered
= fuse_perform_write(file
, mapping
, &i
, pos
);
1136 if (written_buffered
< 0) {
1137 err
= written_buffered
;
1140 endbyte
= pos
+ written_buffered
- 1;
1142 err
= filemap_write_and_wait_range(file
->f_mapping
, pos
,
1147 invalidate_mapping_pages(file
->f_mapping
,
1148 pos
>> PAGE_CACHE_SHIFT
,
1149 endbyte
>> PAGE_CACHE_SHIFT
);
1151 written
+= written_buffered
;
1152 iocb
->ki_pos
= pos
+ written_buffered
;
1154 iov_iter_init(&i
, iov
, nr_segs
, count
, 0);
1155 written
= fuse_perform_write(file
, mapping
, &i
, pos
);
1157 iocb
->ki_pos
= pos
+ written
;
1160 current
->backing_dev_info
= NULL
;
1161 mutex_unlock(&inode
->i_mutex
);
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);
1283 req
= fuse_get_req_for_background(fc
, fuse_iter_npages(&ii
));
1285 req
= fuse_get_req(fc
, fuse_iter_npages(&ii
));
1287 return PTR_ERR(req
);
1291 fl_owner_t owner
= current
->files
;
1292 size_t nbytes
= min(count
, nmax
);
1293 int err
= fuse_get_user_pages(req
, &ii
, &nbytes
, write
);
1300 nres
= fuse_send_write(req
, io
, pos
, nbytes
, owner
);
1302 nres
= fuse_send_read(req
, io
, pos
, nbytes
, owner
);
1305 fuse_release_user_pages(req
, !write
);
1306 if (req
->out
.h
.error
) {
1308 res
= req
->out
.h
.error
;
1310 } else if (nres
> nbytes
) {
1320 fuse_put_request(fc
, req
);
1322 req
= fuse_get_req_for_background(fc
,
1323 fuse_iter_npages(&ii
));
1325 req
= fuse_get_req(fc
, fuse_iter_npages(&ii
));
1331 fuse_put_request(fc
, req
);
1337 EXPORT_SYMBOL_GPL(fuse_direct_io
);
1339 static ssize_t
__fuse_direct_read(struct fuse_io_priv
*io
,
1340 const struct iovec
*iov
,
1341 unsigned long nr_segs
, loff_t
*ppos
,
1345 struct file
*file
= io
->file
;
1346 struct inode
*inode
= file_inode(file
);
1348 if (is_bad_inode(inode
))
1351 res
= fuse_direct_io(io
, iov
, nr_segs
, count
, ppos
, 0);
1353 fuse_invalidate_attr(inode
);
1358 static ssize_t
fuse_direct_read(struct file
*file
, char __user
*buf
,
1359 size_t count
, loff_t
*ppos
)
1361 struct fuse_io_priv io
= { .async
= 0, .file
= file
};
1362 struct iovec iov
= { .iov_base
= buf
, .iov_len
= count
};
1363 return __fuse_direct_read(&io
, &iov
, 1, ppos
, count
);
1366 static ssize_t
__fuse_direct_write(struct fuse_io_priv
*io
,
1367 const struct iovec
*iov
,
1368 unsigned long nr_segs
, loff_t
*ppos
)
1370 struct file
*file
= io
->file
;
1371 struct inode
*inode
= file_inode(file
);
1372 size_t count
= iov_length(iov
, nr_segs
);
1375 res
= generic_write_checks(file
, ppos
, &count
, 0);
1377 res
= fuse_direct_io(io
, iov
, nr_segs
, count
, ppos
, 1);
1379 fuse_invalidate_attr(inode
);
1384 static ssize_t
fuse_direct_write(struct file
*file
, const char __user
*buf
,
1385 size_t count
, loff_t
*ppos
)
1387 struct iovec iov
= { .iov_base
= (void __user
*)buf
, .iov_len
= count
};
1388 struct inode
*inode
= file_inode(file
);
1390 struct fuse_io_priv io
= { .async
= 0, .file
= file
};
1392 if (is_bad_inode(inode
))
1395 /* Don't allow parallel writes to the same file */
1396 mutex_lock(&inode
->i_mutex
);
1397 res
= __fuse_direct_write(&io
, &iov
, 1, ppos
);
1399 fuse_write_update_size(inode
, *ppos
);
1400 mutex_unlock(&inode
->i_mutex
);
1405 static void fuse_writepage_free(struct fuse_conn
*fc
, struct fuse_req
*req
)
1407 __free_page(req
->pages
[0]);
1408 fuse_file_put(req
->ff
, false);
1411 static void fuse_writepage_finish(struct fuse_conn
*fc
, struct fuse_req
*req
)
1413 struct inode
*inode
= req
->inode
;
1414 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1415 struct backing_dev_info
*bdi
= inode
->i_mapping
->backing_dev_info
;
1417 list_del(&req
->writepages_entry
);
1418 dec_bdi_stat(bdi
, BDI_WRITEBACK
);
1419 dec_zone_page_state(req
->pages
[0], NR_WRITEBACK_TEMP
);
1420 bdi_writeout_inc(bdi
);
1421 wake_up(&fi
->page_waitq
);
1424 /* Called under fc->lock, may release and reacquire it */
1425 static void fuse_send_writepage(struct fuse_conn
*fc
, struct fuse_req
*req
)
1426 __releases(fc
->lock
)
1427 __acquires(fc
->lock
)
1429 struct fuse_inode
*fi
= get_fuse_inode(req
->inode
);
1430 loff_t size
= i_size_read(req
->inode
);
1431 struct fuse_write_in
*inarg
= &req
->misc
.write
.in
;
1436 if (inarg
->offset
+ PAGE_CACHE_SIZE
<= size
) {
1437 inarg
->size
= PAGE_CACHE_SIZE
;
1438 } else if (inarg
->offset
< size
) {
1439 inarg
->size
= size
& (PAGE_CACHE_SIZE
- 1);
1441 /* Got truncated off completely */
1445 req
->in
.args
[1].size
= inarg
->size
;
1447 fuse_request_send_background_locked(fc
, req
);
1451 fuse_writepage_finish(fc
, req
);
1452 spin_unlock(&fc
->lock
);
1453 fuse_writepage_free(fc
, req
);
1454 fuse_put_request(fc
, req
);
1455 spin_lock(&fc
->lock
);
1459 * If fi->writectr is positive (no truncate or fsync going on) send
1460 * all queued writepage requests.
1462 * Called with fc->lock
1464 void fuse_flush_writepages(struct inode
*inode
)
1465 __releases(fc
->lock
)
1466 __acquires(fc
->lock
)
1468 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1469 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1470 struct fuse_req
*req
;
1472 while (fi
->writectr
>= 0 && !list_empty(&fi
->queued_writes
)) {
1473 req
= list_entry(fi
->queued_writes
.next
, struct fuse_req
, list
);
1474 list_del_init(&req
->list
);
1475 fuse_send_writepage(fc
, req
);
1479 static void fuse_writepage_end(struct fuse_conn
*fc
, struct fuse_req
*req
)
1481 struct inode
*inode
= req
->inode
;
1482 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1484 mapping_set_error(inode
->i_mapping
, req
->out
.h
.error
);
1485 spin_lock(&fc
->lock
);
1487 fuse_writepage_finish(fc
, req
);
1488 spin_unlock(&fc
->lock
);
1489 fuse_writepage_free(fc
, req
);
1492 static int fuse_writepage_locked(struct page
*page
)
1494 struct address_space
*mapping
= page
->mapping
;
1495 struct inode
*inode
= mapping
->host
;
1496 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1497 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1498 struct fuse_req
*req
;
1499 struct fuse_file
*ff
;
1500 struct page
*tmp_page
;
1502 set_page_writeback(page
);
1504 req
= fuse_request_alloc_nofs(1);
1508 req
->background
= 1; /* writeback always goes to bg_queue */
1509 tmp_page
= alloc_page(GFP_NOFS
| __GFP_HIGHMEM
);
1513 spin_lock(&fc
->lock
);
1514 BUG_ON(list_empty(&fi
->write_files
));
1515 ff
= list_entry(fi
->write_files
.next
, struct fuse_file
, write_entry
);
1516 req
->ff
= fuse_file_get(ff
);
1517 spin_unlock(&fc
->lock
);
1519 fuse_write_fill(req
, ff
, page_offset(page
), 0);
1521 copy_highpage(tmp_page
, page
);
1522 req
->misc
.write
.in
.write_flags
|= FUSE_WRITE_CACHE
;
1523 req
->in
.argpages
= 1;
1525 req
->pages
[0] = tmp_page
;
1526 req
->page_descs
[0].offset
= 0;
1527 req
->page_descs
[0].length
= PAGE_SIZE
;
1528 req
->end
= fuse_writepage_end
;
1531 inc_bdi_stat(mapping
->backing_dev_info
, BDI_WRITEBACK
);
1532 inc_zone_page_state(tmp_page
, NR_WRITEBACK_TEMP
);
1533 end_page_writeback(page
);
1535 spin_lock(&fc
->lock
);
1536 list_add(&req
->writepages_entry
, &fi
->writepages
);
1537 list_add_tail(&req
->list
, &fi
->queued_writes
);
1538 fuse_flush_writepages(inode
);
1539 spin_unlock(&fc
->lock
);
1544 fuse_request_free(req
);
1546 end_page_writeback(page
);
1550 static int fuse_writepage(struct page
*page
, struct writeback_control
*wbc
)
1554 err
= fuse_writepage_locked(page
);
1560 static int fuse_launder_page(struct page
*page
)
1563 if (clear_page_dirty_for_io(page
)) {
1564 struct inode
*inode
= page
->mapping
->host
;
1565 err
= fuse_writepage_locked(page
);
1567 fuse_wait_on_page_writeback(inode
, page
->index
);
1573 * Write back dirty pages now, because there may not be any suitable
1576 static void fuse_vma_close(struct vm_area_struct
*vma
)
1578 filemap_write_and_wait(vma
->vm_file
->f_mapping
);
1582 * Wait for writeback against this page to complete before allowing it
1583 * to be marked dirty again, and hence written back again, possibly
1584 * before the previous writepage completed.
1586 * Block here, instead of in ->writepage(), so that the userspace fs
1587 * can only block processes actually operating on the filesystem.
1589 * Otherwise unprivileged userspace fs would be able to block
1594 * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER
1596 static int fuse_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1598 struct page
*page
= vmf
->page
;
1600 * Don't use page->mapping as it may become NULL from a
1601 * concurrent truncate.
1603 struct inode
*inode
= vma
->vm_file
->f_mapping
->host
;
1605 fuse_wait_on_page_writeback(inode
, page
->index
);
1609 static const struct vm_operations_struct fuse_file_vm_ops
= {
1610 .close
= fuse_vma_close
,
1611 .fault
= filemap_fault
,
1612 .page_mkwrite
= fuse_page_mkwrite
,
1613 .remap_pages
= generic_file_remap_pages
,
1616 static int fuse_file_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1618 if ((vma
->vm_flags
& VM_SHARED
) && (vma
->vm_flags
& VM_MAYWRITE
)) {
1619 struct inode
*inode
= file_inode(file
);
1620 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1621 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1622 struct fuse_file
*ff
= file
->private_data
;
1624 * file may be written through mmap, so chain it onto the
1625 * inodes's write_file list
1627 spin_lock(&fc
->lock
);
1628 if (list_empty(&ff
->write_entry
))
1629 list_add(&ff
->write_entry
, &fi
->write_files
);
1630 spin_unlock(&fc
->lock
);
1632 file_accessed(file
);
1633 vma
->vm_ops
= &fuse_file_vm_ops
;
1637 static int fuse_direct_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1639 /* Can't provide the coherency needed for MAP_SHARED */
1640 if (vma
->vm_flags
& VM_MAYSHARE
)
1643 invalidate_inode_pages2(file
->f_mapping
);
1645 return generic_file_mmap(file
, vma
);
1648 static int convert_fuse_file_lock(const struct fuse_file_lock
*ffl
,
1649 struct file_lock
*fl
)
1651 switch (ffl
->type
) {
1657 if (ffl
->start
> OFFSET_MAX
|| ffl
->end
> OFFSET_MAX
||
1658 ffl
->end
< ffl
->start
)
1661 fl
->fl_start
= ffl
->start
;
1662 fl
->fl_end
= ffl
->end
;
1663 fl
->fl_pid
= ffl
->pid
;
1669 fl
->fl_type
= ffl
->type
;
1673 static void fuse_lk_fill(struct fuse_req
*req
, struct file
*file
,
1674 const struct file_lock
*fl
, int opcode
, pid_t pid
,
1677 struct inode
*inode
= file_inode(file
);
1678 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1679 struct fuse_file
*ff
= file
->private_data
;
1680 struct fuse_lk_in
*arg
= &req
->misc
.lk_in
;
1683 arg
->owner
= fuse_lock_owner_id(fc
, fl
->fl_owner
);
1684 arg
->lk
.start
= fl
->fl_start
;
1685 arg
->lk
.end
= fl
->fl_end
;
1686 arg
->lk
.type
= fl
->fl_type
;
1689 arg
->lk_flags
|= FUSE_LK_FLOCK
;
1690 req
->in
.h
.opcode
= opcode
;
1691 req
->in
.h
.nodeid
= get_node_id(inode
);
1692 req
->in
.numargs
= 1;
1693 req
->in
.args
[0].size
= sizeof(*arg
);
1694 req
->in
.args
[0].value
= arg
;
1697 static int fuse_getlk(struct file
*file
, struct file_lock
*fl
)
1699 struct inode
*inode
= file_inode(file
);
1700 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1701 struct fuse_req
*req
;
1702 struct fuse_lk_out outarg
;
1705 req
= fuse_get_req_nopages(fc
);
1707 return PTR_ERR(req
);
1709 fuse_lk_fill(req
, file
, fl
, FUSE_GETLK
, 0, 0);
1710 req
->out
.numargs
= 1;
1711 req
->out
.args
[0].size
= sizeof(outarg
);
1712 req
->out
.args
[0].value
= &outarg
;
1713 fuse_request_send(fc
, req
);
1714 err
= req
->out
.h
.error
;
1715 fuse_put_request(fc
, req
);
1717 err
= convert_fuse_file_lock(&outarg
.lk
, fl
);
1722 static int fuse_setlk(struct file
*file
, struct file_lock
*fl
, int flock
)
1724 struct inode
*inode
= file_inode(file
);
1725 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1726 struct fuse_req
*req
;
1727 int opcode
= (fl
->fl_flags
& FL_SLEEP
) ? FUSE_SETLKW
: FUSE_SETLK
;
1728 pid_t pid
= fl
->fl_type
!= F_UNLCK
? current
->tgid
: 0;
1731 if (fl
->fl_lmops
&& fl
->fl_lmops
->lm_grant
) {
1732 /* NLM needs asynchronous locks, which we don't support yet */
1736 /* Unlock on close is handled by the flush method */
1737 if (fl
->fl_flags
& FL_CLOSE
)
1740 req
= fuse_get_req_nopages(fc
);
1742 return PTR_ERR(req
);
1744 fuse_lk_fill(req
, file
, fl
, opcode
, pid
, flock
);
1745 fuse_request_send(fc
, req
);
1746 err
= req
->out
.h
.error
;
1747 /* locking is restartable */
1750 fuse_put_request(fc
, req
);
1754 static int fuse_file_lock(struct file
*file
, int cmd
, struct file_lock
*fl
)
1756 struct inode
*inode
= file_inode(file
);
1757 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1760 if (cmd
== F_CANCELLK
) {
1762 } else if (cmd
== F_GETLK
) {
1764 posix_test_lock(file
, fl
);
1767 err
= fuse_getlk(file
, fl
);
1770 err
= posix_lock_file(file
, fl
, NULL
);
1772 err
= fuse_setlk(file
, fl
, 0);
1777 static int fuse_file_flock(struct file
*file
, int cmd
, struct file_lock
*fl
)
1779 struct inode
*inode
= file_inode(file
);
1780 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1784 err
= flock_lock_file_wait(file
, fl
);
1786 struct fuse_file
*ff
= file
->private_data
;
1788 /* emulate flock with POSIX locks */
1789 fl
->fl_owner
= (fl_owner_t
) file
;
1791 err
= fuse_setlk(file
, fl
, 1);
1797 static sector_t
fuse_bmap(struct address_space
*mapping
, sector_t block
)
1799 struct inode
*inode
= mapping
->host
;
1800 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1801 struct fuse_req
*req
;
1802 struct fuse_bmap_in inarg
;
1803 struct fuse_bmap_out outarg
;
1806 if (!inode
->i_sb
->s_bdev
|| fc
->no_bmap
)
1809 req
= fuse_get_req_nopages(fc
);
1813 memset(&inarg
, 0, sizeof(inarg
));
1814 inarg
.block
= block
;
1815 inarg
.blocksize
= inode
->i_sb
->s_blocksize
;
1816 req
->in
.h
.opcode
= FUSE_BMAP
;
1817 req
->in
.h
.nodeid
= get_node_id(inode
);
1818 req
->in
.numargs
= 1;
1819 req
->in
.args
[0].size
= sizeof(inarg
);
1820 req
->in
.args
[0].value
= &inarg
;
1821 req
->out
.numargs
= 1;
1822 req
->out
.args
[0].size
= sizeof(outarg
);
1823 req
->out
.args
[0].value
= &outarg
;
1824 fuse_request_send(fc
, req
);
1825 err
= req
->out
.h
.error
;
1826 fuse_put_request(fc
, req
);
1830 return err
? 0 : outarg
.block
;
1833 static loff_t
fuse_file_llseek(struct file
*file
, loff_t offset
, int whence
)
1836 struct inode
*inode
= file_inode(file
);
1838 /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */
1839 if (whence
== SEEK_CUR
|| whence
== SEEK_SET
)
1840 return generic_file_llseek(file
, offset
, whence
);
1842 mutex_lock(&inode
->i_mutex
);
1843 retval
= fuse_update_attributes(inode
, NULL
, file
, NULL
);
1845 retval
= generic_file_llseek(file
, offset
, whence
);
1846 mutex_unlock(&inode
->i_mutex
);
1851 static int fuse_ioctl_copy_user(struct page
**pages
, struct iovec
*iov
,
1852 unsigned int nr_segs
, size_t bytes
, bool to_user
)
1860 iov_iter_init(&ii
, iov
, nr_segs
, bytes
, 0);
1862 while (iov_iter_count(&ii
)) {
1863 struct page
*page
= pages
[page_idx
++];
1864 size_t todo
= min_t(size_t, PAGE_SIZE
, iov_iter_count(&ii
));
1870 char __user
*uaddr
= ii
.iov
->iov_base
+ ii
.iov_offset
;
1871 size_t iov_len
= ii
.iov
->iov_len
- ii
.iov_offset
;
1872 size_t copy
= min(todo
, iov_len
);
1876 left
= copy_from_user(kaddr
, uaddr
, copy
);
1878 left
= copy_to_user(uaddr
, kaddr
, copy
);
1883 iov_iter_advance(&ii
, copy
);
1895 * CUSE servers compiled on 32bit broke on 64bit kernels because the
1896 * ABI was defined to be 'struct iovec' which is different on 32bit
1897 * and 64bit. Fortunately we can determine which structure the server
1898 * used from the size of the reply.
1900 static int fuse_copy_ioctl_iovec_old(struct iovec
*dst
, void *src
,
1901 size_t transferred
, unsigned count
,
1904 #ifdef CONFIG_COMPAT
1905 if (count
* sizeof(struct compat_iovec
) == transferred
) {
1906 struct compat_iovec
*ciov
= src
;
1910 * With this interface a 32bit server cannot support
1911 * non-compat (i.e. ones coming from 64bit apps) ioctl
1917 for (i
= 0; i
< count
; i
++) {
1918 dst
[i
].iov_base
= compat_ptr(ciov
[i
].iov_base
);
1919 dst
[i
].iov_len
= ciov
[i
].iov_len
;
1925 if (count
* sizeof(struct iovec
) != transferred
)
1928 memcpy(dst
, src
, transferred
);
1932 /* Make sure iov_length() won't overflow */
1933 static int fuse_verify_ioctl_iov(struct iovec
*iov
, size_t count
)
1936 u32 max
= FUSE_MAX_PAGES_PER_REQ
<< PAGE_SHIFT
;
1938 for (n
= 0; n
< count
; n
++, iov
++) {
1939 if (iov
->iov_len
> (size_t) max
)
1941 max
-= iov
->iov_len
;
1946 static int fuse_copy_ioctl_iovec(struct fuse_conn
*fc
, struct iovec
*dst
,
1947 void *src
, size_t transferred
, unsigned count
,
1951 struct fuse_ioctl_iovec
*fiov
= src
;
1953 if (fc
->minor
< 16) {
1954 return fuse_copy_ioctl_iovec_old(dst
, src
, transferred
,
1958 if (count
* sizeof(struct fuse_ioctl_iovec
) != transferred
)
1961 for (i
= 0; i
< count
; i
++) {
1962 /* Did the server supply an inappropriate value? */
1963 if (fiov
[i
].base
!= (unsigned long) fiov
[i
].base
||
1964 fiov
[i
].len
!= (unsigned long) fiov
[i
].len
)
1967 dst
[i
].iov_base
= (void __user
*) (unsigned long) fiov
[i
].base
;
1968 dst
[i
].iov_len
= (size_t) fiov
[i
].len
;
1970 #ifdef CONFIG_COMPAT
1972 (ptr_to_compat(dst
[i
].iov_base
) != fiov
[i
].base
||
1973 (compat_size_t
) dst
[i
].iov_len
!= fiov
[i
].len
))
1983 * For ioctls, there is no generic way to determine how much memory
1984 * needs to be read and/or written. Furthermore, ioctls are allowed
1985 * to dereference the passed pointer, so the parameter requires deep
1986 * copying but FUSE has no idea whatsoever about what to copy in or
1989 * This is solved by allowing FUSE server to retry ioctl with
1990 * necessary in/out iovecs. Let's assume the ioctl implementation
1991 * needs to read in the following structure.
1998 * On the first callout to FUSE server, inarg->in_size and
1999 * inarg->out_size will be NULL; then, the server completes the ioctl
2000 * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and
2001 * the actual iov array to
2003 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } }
2005 * which tells FUSE to copy in the requested area and retry the ioctl.
2006 * On the second round, the server has access to the structure and
2007 * from that it can tell what to look for next, so on the invocation,
2008 * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to
2010 * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) },
2011 * { .iov_base = a.buf, .iov_len = a.buflen } }
2013 * FUSE will copy both struct a and the pointed buffer from the
2014 * process doing the ioctl and retry ioctl with both struct a and the
2017 * This time, FUSE server has everything it needs and completes ioctl
2018 * without FUSE_IOCTL_RETRY which finishes the ioctl call.
2020 * Copying data out works the same way.
2022 * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel
2023 * automatically initializes in and out iovs by decoding @cmd with
2024 * _IOC_* macros and the server is not allowed to request RETRY. This
2025 * limits ioctl data transfers to well-formed ioctls and is the forced
2026 * behavior for all FUSE servers.
2028 long fuse_do_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
,
2031 struct fuse_file
*ff
= file
->private_data
;
2032 struct fuse_conn
*fc
= ff
->fc
;
2033 struct fuse_ioctl_in inarg
= {
2039 struct fuse_ioctl_out outarg
;
2040 struct fuse_req
*req
= NULL
;
2041 struct page
**pages
= NULL
;
2042 struct iovec
*iov_page
= NULL
;
2043 struct iovec
*in_iov
= NULL
, *out_iov
= NULL
;
2044 unsigned int in_iovs
= 0, out_iovs
= 0, num_pages
= 0, max_pages
;
2045 size_t in_size
, out_size
, transferred
;
2048 #if BITS_PER_LONG == 32
2049 inarg
.flags
|= FUSE_IOCTL_32BIT
;
2051 if (flags
& FUSE_IOCTL_COMPAT
)
2052 inarg
.flags
|= FUSE_IOCTL_32BIT
;
2055 /* assume all the iovs returned by client always fits in a page */
2056 BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec
) * FUSE_IOCTL_MAX_IOV
> PAGE_SIZE
);
2059 pages
= kcalloc(FUSE_MAX_PAGES_PER_REQ
, sizeof(pages
[0]), GFP_KERNEL
);
2060 iov_page
= (struct iovec
*) __get_free_page(GFP_KERNEL
);
2061 if (!pages
|| !iov_page
)
2065 * If restricted, initialize IO parameters as encoded in @cmd.
2066 * RETRY from server is not allowed.
2068 if (!(flags
& FUSE_IOCTL_UNRESTRICTED
)) {
2069 struct iovec
*iov
= iov_page
;
2071 iov
->iov_base
= (void __user
*)arg
;
2072 iov
->iov_len
= _IOC_SIZE(cmd
);
2074 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
2079 if (_IOC_DIR(cmd
) & _IOC_READ
) {
2086 inarg
.in_size
= in_size
= iov_length(in_iov
, in_iovs
);
2087 inarg
.out_size
= out_size
= iov_length(out_iov
, out_iovs
);
2090 * Out data can be used either for actual out data or iovs,
2091 * make sure there always is at least one page.
2093 out_size
= max_t(size_t, out_size
, PAGE_SIZE
);
2094 max_pages
= DIV_ROUND_UP(max(in_size
, out_size
), PAGE_SIZE
);
2096 /* make sure there are enough buffer pages and init request with them */
2098 if (max_pages
> FUSE_MAX_PAGES_PER_REQ
)
2100 while (num_pages
< max_pages
) {
2101 pages
[num_pages
] = alloc_page(GFP_KERNEL
| __GFP_HIGHMEM
);
2102 if (!pages
[num_pages
])
2107 req
= fuse_get_req(fc
, num_pages
);
2113 memcpy(req
->pages
, pages
, sizeof(req
->pages
[0]) * num_pages
);
2114 req
->num_pages
= num_pages
;
2115 fuse_page_descs_length_init(req
, 0, req
->num_pages
);
2117 /* okay, let's send it to the client */
2118 req
->in
.h
.opcode
= FUSE_IOCTL
;
2119 req
->in
.h
.nodeid
= ff
->nodeid
;
2120 req
->in
.numargs
= 1;
2121 req
->in
.args
[0].size
= sizeof(inarg
);
2122 req
->in
.args
[0].value
= &inarg
;
2125 req
->in
.args
[1].size
= in_size
;
2126 req
->in
.argpages
= 1;
2128 err
= fuse_ioctl_copy_user(pages
, in_iov
, in_iovs
, in_size
,
2134 req
->out
.numargs
= 2;
2135 req
->out
.args
[0].size
= sizeof(outarg
);
2136 req
->out
.args
[0].value
= &outarg
;
2137 req
->out
.args
[1].size
= out_size
;
2138 req
->out
.argpages
= 1;
2139 req
->out
.argvar
= 1;
2141 fuse_request_send(fc
, req
);
2142 err
= req
->out
.h
.error
;
2143 transferred
= req
->out
.args
[1].size
;
2144 fuse_put_request(fc
, req
);
2149 /* did it ask for retry? */
2150 if (outarg
.flags
& FUSE_IOCTL_RETRY
) {
2153 /* no retry if in restricted mode */
2155 if (!(flags
& FUSE_IOCTL_UNRESTRICTED
))
2158 in_iovs
= outarg
.in_iovs
;
2159 out_iovs
= outarg
.out_iovs
;
2162 * Make sure things are in boundary, separate checks
2163 * are to protect against overflow.
2166 if (in_iovs
> FUSE_IOCTL_MAX_IOV
||
2167 out_iovs
> FUSE_IOCTL_MAX_IOV
||
2168 in_iovs
+ out_iovs
> FUSE_IOCTL_MAX_IOV
)
2171 vaddr
= kmap_atomic(pages
[0]);
2172 err
= fuse_copy_ioctl_iovec(fc
, iov_page
, vaddr
,
2173 transferred
, in_iovs
+ out_iovs
,
2174 (flags
& FUSE_IOCTL_COMPAT
) != 0);
2175 kunmap_atomic(vaddr
);
2180 out_iov
= in_iov
+ in_iovs
;
2182 err
= fuse_verify_ioctl_iov(in_iov
, in_iovs
);
2186 err
= fuse_verify_ioctl_iov(out_iov
, out_iovs
);
2194 if (transferred
> inarg
.out_size
)
2197 err
= fuse_ioctl_copy_user(pages
, out_iov
, out_iovs
, transferred
, true);
2200 fuse_put_request(fc
, req
);
2201 free_page((unsigned long) iov_page
);
2203 __free_page(pages
[--num_pages
]);
2206 return err
? err
: outarg
.result
;
2208 EXPORT_SYMBOL_GPL(fuse_do_ioctl
);
2210 long fuse_ioctl_common(struct file
*file
, unsigned int cmd
,
2211 unsigned long arg
, unsigned int flags
)
2213 struct inode
*inode
= file_inode(file
);
2214 struct fuse_conn
*fc
= get_fuse_conn(inode
);
2216 if (!fuse_allow_current_process(fc
))
2219 if (is_bad_inode(inode
))
2222 return fuse_do_ioctl(file
, cmd
, arg
, flags
);
2225 static long fuse_file_ioctl(struct file
*file
, unsigned int cmd
,
2228 return fuse_ioctl_common(file
, cmd
, arg
, 0);
2231 static long fuse_file_compat_ioctl(struct file
*file
, unsigned int cmd
,
2234 return fuse_ioctl_common(file
, cmd
, arg
, FUSE_IOCTL_COMPAT
);
2238 * All files which have been polled are linked to RB tree
2239 * fuse_conn->polled_files which is indexed by kh. Walk the tree and
2240 * find the matching one.
2242 static struct rb_node
**fuse_find_polled_node(struct fuse_conn
*fc
, u64 kh
,
2243 struct rb_node
**parent_out
)
2245 struct rb_node
**link
= &fc
->polled_files
.rb_node
;
2246 struct rb_node
*last
= NULL
;
2249 struct fuse_file
*ff
;
2252 ff
= rb_entry(last
, struct fuse_file
, polled_node
);
2255 link
= &last
->rb_left
;
2256 else if (kh
> ff
->kh
)
2257 link
= &last
->rb_right
;
2268 * The file is about to be polled. Make sure it's on the polled_files
2269 * RB tree. Note that files once added to the polled_files tree are
2270 * not removed before the file is released. This is because a file
2271 * polled once is likely to be polled again.
2273 static void fuse_register_polled_file(struct fuse_conn
*fc
,
2274 struct fuse_file
*ff
)
2276 spin_lock(&fc
->lock
);
2277 if (RB_EMPTY_NODE(&ff
->polled_node
)) {
2278 struct rb_node
**link
, *parent
;
2280 link
= fuse_find_polled_node(fc
, ff
->kh
, &parent
);
2282 rb_link_node(&ff
->polled_node
, parent
, link
);
2283 rb_insert_color(&ff
->polled_node
, &fc
->polled_files
);
2285 spin_unlock(&fc
->lock
);
2288 unsigned fuse_file_poll(struct file
*file
, poll_table
*wait
)
2290 struct fuse_file
*ff
= file
->private_data
;
2291 struct fuse_conn
*fc
= ff
->fc
;
2292 struct fuse_poll_in inarg
= { .fh
= ff
->fh
, .kh
= ff
->kh
};
2293 struct fuse_poll_out outarg
;
2294 struct fuse_req
*req
;
2298 return DEFAULT_POLLMASK
;
2300 poll_wait(file
, &ff
->poll_wait
, wait
);
2301 inarg
.events
= (__u32
)poll_requested_events(wait
);
2304 * Ask for notification iff there's someone waiting for it.
2305 * The client may ignore the flag and always notify.
2307 if (waitqueue_active(&ff
->poll_wait
)) {
2308 inarg
.flags
|= FUSE_POLL_SCHEDULE_NOTIFY
;
2309 fuse_register_polled_file(fc
, ff
);
2312 req
= fuse_get_req_nopages(fc
);
2316 req
->in
.h
.opcode
= FUSE_POLL
;
2317 req
->in
.h
.nodeid
= ff
->nodeid
;
2318 req
->in
.numargs
= 1;
2319 req
->in
.args
[0].size
= sizeof(inarg
);
2320 req
->in
.args
[0].value
= &inarg
;
2321 req
->out
.numargs
= 1;
2322 req
->out
.args
[0].size
= sizeof(outarg
);
2323 req
->out
.args
[0].value
= &outarg
;
2324 fuse_request_send(fc
, req
);
2325 err
= req
->out
.h
.error
;
2326 fuse_put_request(fc
, req
);
2329 return outarg
.revents
;
2330 if (err
== -ENOSYS
) {
2332 return DEFAULT_POLLMASK
;
2336 EXPORT_SYMBOL_GPL(fuse_file_poll
);
2339 * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and
2340 * wakes up the poll waiters.
2342 int fuse_notify_poll_wakeup(struct fuse_conn
*fc
,
2343 struct fuse_notify_poll_wakeup_out
*outarg
)
2345 u64 kh
= outarg
->kh
;
2346 struct rb_node
**link
;
2348 spin_lock(&fc
->lock
);
2350 link
= fuse_find_polled_node(fc
, kh
, NULL
);
2352 struct fuse_file
*ff
;
2354 ff
= rb_entry(*link
, struct fuse_file
, polled_node
);
2355 wake_up_interruptible_sync(&ff
->poll_wait
);
2358 spin_unlock(&fc
->lock
);
2362 static void fuse_do_truncate(struct file
*file
)
2364 struct inode
*inode
= file
->f_mapping
->host
;
2367 attr
.ia_valid
= ATTR_SIZE
;
2368 attr
.ia_size
= i_size_read(inode
);
2370 attr
.ia_file
= file
;
2371 attr
.ia_valid
|= ATTR_FILE
;
2373 fuse_do_setattr(inode
, &attr
, file
);
2376 static inline loff_t
fuse_round_up(loff_t off
)
2378 return round_up(off
, FUSE_MAX_PAGES_PER_REQ
<< PAGE_SHIFT
);
2382 fuse_direct_IO(int rw
, struct kiocb
*iocb
, const struct iovec
*iov
,
2383 loff_t offset
, unsigned long nr_segs
)
2386 struct file
*file
= iocb
->ki_filp
;
2387 struct fuse_file
*ff
= file
->private_data
;
2388 bool async_dio
= ff
->fc
->async_dio
;
2390 struct inode
*inode
;
2392 size_t count
= iov_length(iov
, nr_segs
);
2393 struct fuse_io_priv
*io
;
2396 inode
= file
->f_mapping
->host
;
2397 i_size
= i_size_read(inode
);
2399 /* optimization for short read */
2400 if (async_dio
&& rw
!= WRITE
&& offset
+ count
> i_size
) {
2401 if (offset
>= i_size
)
2403 count
= min_t(loff_t
, count
, fuse_round_up(i_size
- offset
));
2406 io
= kmalloc(sizeof(struct fuse_io_priv
), GFP_KERNEL
);
2409 spin_lock_init(&io
->lock
);
2413 io
->offset
= offset
;
2414 io
->write
= (rw
== WRITE
);
2418 * By default, we want to optimize all I/Os with async request
2419 * submission to the client filesystem if supported.
2421 io
->async
= async_dio
;
2425 * We cannot asynchronously extend the size of a file. We have no method
2426 * to wait on real async I/O requests, so we must submit this request
2429 if (!is_sync_kiocb(iocb
) && (offset
+ count
> i_size
) && rw
== WRITE
)
2433 ret
= __fuse_direct_write(io
, iov
, nr_segs
, &pos
);
2435 ret
= __fuse_direct_read(io
, iov
, nr_segs
, &pos
, count
);
2438 fuse_aio_complete(io
, ret
< 0 ? ret
: 0, -1);
2440 /* we have a non-extending, async request, so return */
2441 if (!is_sync_kiocb(iocb
))
2442 return -EIOCBQUEUED
;
2444 ret
= wait_on_sync_kiocb(iocb
);
2451 fuse_write_update_size(inode
, pos
);
2452 else if (ret
< 0 && offset
+ count
> i_size
)
2453 fuse_do_truncate(file
);
2459 static long fuse_file_fallocate(struct file
*file
, int mode
, loff_t offset
,
2462 struct fuse_file
*ff
= file
->private_data
;
2463 struct inode
*inode
= file
->f_inode
;
2464 struct fuse_conn
*fc
= ff
->fc
;
2465 struct fuse_req
*req
;
2466 struct fuse_fallocate_in inarg
= {
2474 if (fc
->no_fallocate
)
2477 if (mode
& FALLOC_FL_PUNCH_HOLE
) {
2478 mutex_lock(&inode
->i_mutex
);
2479 fuse_set_nowrite(inode
);
2482 req
= fuse_get_req_nopages(fc
);
2488 req
->in
.h
.opcode
= FUSE_FALLOCATE
;
2489 req
->in
.h
.nodeid
= ff
->nodeid
;
2490 req
->in
.numargs
= 1;
2491 req
->in
.args
[0].size
= sizeof(inarg
);
2492 req
->in
.args
[0].value
= &inarg
;
2493 fuse_request_send(fc
, req
);
2494 err
= req
->out
.h
.error
;
2495 if (err
== -ENOSYS
) {
2496 fc
->no_fallocate
= 1;
2499 fuse_put_request(fc
, req
);
2504 /* we could have extended the file */
2505 if (!(mode
& FALLOC_FL_KEEP_SIZE
))
2506 fuse_write_update_size(inode
, offset
+ length
);
2508 if (mode
& FALLOC_FL_PUNCH_HOLE
)
2509 truncate_pagecache_range(inode
, offset
, offset
+ length
- 1);
2511 fuse_invalidate_attr(inode
);
2514 if (mode
& FALLOC_FL_PUNCH_HOLE
) {
2515 fuse_release_nowrite(inode
);
2516 mutex_unlock(&inode
->i_mutex
);
2522 static const struct file_operations fuse_file_operations
= {
2523 .llseek
= fuse_file_llseek
,
2524 .read
= do_sync_read
,
2525 .aio_read
= fuse_file_aio_read
,
2526 .write
= do_sync_write
,
2527 .aio_write
= fuse_file_aio_write
,
2528 .mmap
= fuse_file_mmap
,
2530 .flush
= fuse_flush
,
2531 .release
= fuse_release
,
2532 .fsync
= fuse_fsync
,
2533 .lock
= fuse_file_lock
,
2534 .flock
= fuse_file_flock
,
2535 .splice_read
= generic_file_splice_read
,
2536 .unlocked_ioctl
= fuse_file_ioctl
,
2537 .compat_ioctl
= fuse_file_compat_ioctl
,
2538 .poll
= fuse_file_poll
,
2539 .fallocate
= fuse_file_fallocate
,
2542 static const struct file_operations fuse_direct_io_file_operations
= {
2543 .llseek
= fuse_file_llseek
,
2544 .read
= fuse_direct_read
,
2545 .write
= fuse_direct_write
,
2546 .mmap
= fuse_direct_mmap
,
2548 .flush
= fuse_flush
,
2549 .release
= fuse_release
,
2550 .fsync
= fuse_fsync
,
2551 .lock
= fuse_file_lock
,
2552 .flock
= fuse_file_flock
,
2553 .unlocked_ioctl
= fuse_file_ioctl
,
2554 .compat_ioctl
= fuse_file_compat_ioctl
,
2555 .poll
= fuse_file_poll
,
2556 .fallocate
= fuse_file_fallocate
,
2557 /* no splice_read */
2560 static const struct address_space_operations fuse_file_aops
= {
2561 .readpage
= fuse_readpage
,
2562 .writepage
= fuse_writepage
,
2563 .launder_page
= fuse_launder_page
,
2564 .readpages
= fuse_readpages
,
2565 .set_page_dirty
= __set_page_dirty_nobuffers
,
2567 .direct_IO
= fuse_direct_IO
,
2570 void fuse_init_file_inode(struct inode
*inode
)
2572 inode
->i_fop
= &fuse_file_operations
;
2573 inode
->i_data
.a_ops
= &fuse_file_aops
;