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/file.h>
13 #include <linux/sched.h>
14 #include <linux/namei.h>
15 #include <linux/slab.h>
17 #if BITS_PER_LONG >= 64
18 static inline void fuse_dentry_settime(struct dentry
*entry
, u64 time
)
23 static inline u64
fuse_dentry_time(struct dentry
*entry
)
29 * On 32 bit archs store the high 32 bits of time in d_fsdata
31 static void fuse_dentry_settime(struct dentry
*entry
, u64 time
)
34 entry
->d_fsdata
= (void *) (unsigned long) (time
>> 32);
37 static u64
fuse_dentry_time(struct dentry
*entry
)
39 return (u64
) entry
->d_time
+
40 ((u64
) (unsigned long) entry
->d_fsdata
<< 32);
45 * FUSE caches dentries and attributes with separate timeout. The
46 * time in jiffies until the dentry/attributes are valid is stored in
47 * dentry->d_time and fuse_inode->i_time respectively.
51 * Calculate the time in jiffies until a dentry/attributes are valid
53 static u64
time_to_jiffies(unsigned long sec
, unsigned long nsec
)
56 struct timespec ts
= {sec
, nsec
};
57 return get_jiffies_64() + timespec_to_jiffies(&ts
);
63 * Set dentry and possibly attribute timeouts from the lookup/mk*
66 static void fuse_change_entry_timeout(struct dentry
*entry
,
67 struct fuse_entry_out
*o
)
69 fuse_dentry_settime(entry
,
70 time_to_jiffies(o
->entry_valid
, o
->entry_valid_nsec
));
73 static u64
attr_timeout(struct fuse_attr_out
*o
)
75 return time_to_jiffies(o
->attr_valid
, o
->attr_valid_nsec
);
78 static u64
entry_attr_timeout(struct fuse_entry_out
*o
)
80 return time_to_jiffies(o
->attr_valid
, o
->attr_valid_nsec
);
84 * Mark the attributes as stale, so that at the next call to
85 * ->getattr() they will be fetched from userspace
87 void fuse_invalidate_attr(struct inode
*inode
)
89 get_fuse_inode(inode
)->i_time
= 0;
93 * Just mark the entry as stale, so that a next attempt to look it up
94 * will result in a new lookup call to userspace
96 * This is called when a dentry is about to become negative and the
97 * timeout is unknown (unlink, rmdir, rename and in some cases
100 void fuse_invalidate_entry_cache(struct dentry
*entry
)
102 fuse_dentry_settime(entry
, 0);
106 * Same as fuse_invalidate_entry_cache(), but also try to remove the
107 * dentry from the hash
109 static void fuse_invalidate_entry(struct dentry
*entry
)
112 fuse_invalidate_entry_cache(entry
);
115 static void fuse_lookup_init(struct fuse_conn
*fc
, struct fuse_req
*req
,
116 u64 nodeid
, struct qstr
*name
,
117 struct fuse_entry_out
*outarg
)
119 memset(outarg
, 0, sizeof(struct fuse_entry_out
));
120 req
->in
.h
.opcode
= FUSE_LOOKUP
;
121 req
->in
.h
.nodeid
= nodeid
;
123 req
->in
.args
[0].size
= name
->len
+ 1;
124 req
->in
.args
[0].value
= name
->name
;
125 req
->out
.numargs
= 1;
127 req
->out
.args
[0].size
= FUSE_COMPAT_ENTRY_OUT_SIZE
;
129 req
->out
.args
[0].size
= sizeof(struct fuse_entry_out
);
130 req
->out
.args
[0].value
= outarg
;
133 u64
fuse_get_attr_version(struct fuse_conn
*fc
)
138 * The spin lock isn't actually needed on 64bit archs, but we
139 * don't yet care too much about such optimizations.
141 spin_lock(&fc
->lock
);
142 curr_version
= fc
->attr_version
;
143 spin_unlock(&fc
->lock
);
149 * Check whether the dentry is still valid
151 * If the entry validity timeout has expired and the dentry is
152 * positive, try to redo the lookup. If the lookup results in a
153 * different inode, then let the VFS invalidate the dentry and redo
154 * the lookup once more. If the lookup results in the same inode,
155 * then refresh the attributes, timeouts and mark the dentry valid.
157 static int fuse_dentry_revalidate(struct dentry
*entry
, unsigned int flags
)
161 inode
= ACCESS_ONCE(entry
->d_inode
);
162 if (inode
&& is_bad_inode(inode
))
164 else if (fuse_dentry_time(entry
) < get_jiffies_64()) {
166 struct fuse_entry_out outarg
;
167 struct fuse_conn
*fc
;
168 struct fuse_req
*req
;
169 struct fuse_forget_link
*forget
;
170 struct dentry
*parent
;
173 /* For negative dentries, always do a fresh lookup */
177 if (flags
& LOOKUP_RCU
)
180 fc
= get_fuse_conn(inode
);
181 req
= fuse_get_req(fc
);
185 forget
= fuse_alloc_forget();
187 fuse_put_request(fc
, req
);
191 attr_version
= fuse_get_attr_version(fc
);
193 parent
= dget_parent(entry
);
194 fuse_lookup_init(fc
, req
, get_node_id(parent
->d_inode
),
195 &entry
->d_name
, &outarg
);
196 fuse_request_send(fc
, req
);
198 err
= req
->out
.h
.error
;
199 fuse_put_request(fc
, req
);
200 /* Zero nodeid is same as -ENOENT */
201 if (!err
&& !outarg
.nodeid
)
204 struct fuse_inode
*fi
= get_fuse_inode(inode
);
205 if (outarg
.nodeid
!= get_node_id(inode
)) {
206 fuse_queue_forget(fc
, forget
, outarg
.nodeid
, 1);
209 spin_lock(&fc
->lock
);
211 spin_unlock(&fc
->lock
);
214 if (err
|| (outarg
.attr
.mode
^ inode
->i_mode
) & S_IFMT
)
217 fuse_change_attributes(inode
, &outarg
.attr
,
218 entry_attr_timeout(&outarg
),
220 fuse_change_entry_timeout(entry
, &outarg
);
225 static int invalid_nodeid(u64 nodeid
)
227 return !nodeid
|| nodeid
== FUSE_ROOT_ID
;
230 const struct dentry_operations fuse_dentry_operations
= {
231 .d_revalidate
= fuse_dentry_revalidate
,
234 int fuse_valid_type(int m
)
236 return S_ISREG(m
) || S_ISDIR(m
) || S_ISLNK(m
) || S_ISCHR(m
) ||
237 S_ISBLK(m
) || S_ISFIFO(m
) || S_ISSOCK(m
);
241 * Add a directory inode to a dentry, ensuring that no other dentry
242 * refers to this inode. Called with fc->inst_mutex.
244 static struct dentry
*fuse_d_add_directory(struct dentry
*entry
,
247 struct dentry
*alias
= d_find_alias(inode
);
248 if (alias
&& !(alias
->d_flags
& DCACHE_DISCONNECTED
)) {
249 /* This tries to shrink the subtree below alias */
250 fuse_invalidate_entry(alias
);
252 if (!hlist_empty(&inode
->i_dentry
))
253 return ERR_PTR(-EBUSY
);
257 return d_splice_alias(inode
, entry
);
260 int fuse_lookup_name(struct super_block
*sb
, u64 nodeid
, struct qstr
*name
,
261 struct fuse_entry_out
*outarg
, struct inode
**inode
)
263 struct fuse_conn
*fc
= get_fuse_conn_super(sb
);
264 struct fuse_req
*req
;
265 struct fuse_forget_link
*forget
;
271 if (name
->len
> FUSE_NAME_MAX
)
274 req
= fuse_get_req(fc
);
279 forget
= fuse_alloc_forget();
282 fuse_put_request(fc
, req
);
286 attr_version
= fuse_get_attr_version(fc
);
288 fuse_lookup_init(fc
, req
, nodeid
, name
, outarg
);
289 fuse_request_send(fc
, req
);
290 err
= req
->out
.h
.error
;
291 fuse_put_request(fc
, req
);
292 /* Zero nodeid is same as -ENOENT, but with valid timeout */
293 if (err
|| !outarg
->nodeid
)
299 if (!fuse_valid_type(outarg
->attr
.mode
))
302 *inode
= fuse_iget(sb
, outarg
->nodeid
, outarg
->generation
,
303 &outarg
->attr
, entry_attr_timeout(outarg
),
307 fuse_queue_forget(fc
, forget
, outarg
->nodeid
, 1);
318 static struct dentry
*fuse_lookup(struct inode
*dir
, struct dentry
*entry
,
322 struct fuse_entry_out outarg
;
324 struct dentry
*newent
;
325 struct fuse_conn
*fc
= get_fuse_conn(dir
);
326 bool outarg_valid
= true;
328 err
= fuse_lookup_name(dir
->i_sb
, get_node_id(dir
), &entry
->d_name
,
330 if (err
== -ENOENT
) {
331 outarg_valid
= false;
338 if (inode
&& get_node_id(inode
) == FUSE_ROOT_ID
)
341 if (inode
&& S_ISDIR(inode
->i_mode
)) {
342 mutex_lock(&fc
->inst_mutex
);
343 newent
= fuse_d_add_directory(entry
, inode
);
344 mutex_unlock(&fc
->inst_mutex
);
345 err
= PTR_ERR(newent
);
349 newent
= d_splice_alias(inode
, entry
);
352 entry
= newent
? newent
: entry
;
354 fuse_change_entry_timeout(entry
, &outarg
);
356 fuse_invalidate_entry_cache(entry
);
367 * Atomic create+open operation
369 * If the filesystem doesn't support this, then fall back to separate
370 * 'mknod' + 'open' requests.
372 static int fuse_create_open(struct inode
*dir
, struct dentry
*entry
,
373 struct file
*file
, unsigned flags
,
374 umode_t mode
, int *opened
)
378 struct fuse_conn
*fc
= get_fuse_conn(dir
);
379 struct fuse_req
*req
;
380 struct fuse_forget_link
*forget
;
381 struct fuse_create_in inarg
;
382 struct fuse_open_out outopen
;
383 struct fuse_entry_out outentry
;
384 struct fuse_file
*ff
;
386 /* Userspace expects S_IFREG in create mode */
387 BUG_ON((mode
& S_IFMT
) != S_IFREG
);
389 forget
= fuse_alloc_forget();
394 req
= fuse_get_req(fc
);
397 goto out_put_forget_req
;
400 ff
= fuse_file_alloc(fc
);
402 goto out_put_request
;
405 mode
&= ~current_umask();
408 memset(&inarg
, 0, sizeof(inarg
));
409 memset(&outentry
, 0, sizeof(outentry
));
412 inarg
.umask
= current_umask();
413 req
->in
.h
.opcode
= FUSE_CREATE
;
414 req
->in
.h
.nodeid
= get_node_id(dir
);
416 req
->in
.args
[0].size
= fc
->minor
< 12 ? sizeof(struct fuse_open_in
) :
418 req
->in
.args
[0].value
= &inarg
;
419 req
->in
.args
[1].size
= entry
->d_name
.len
+ 1;
420 req
->in
.args
[1].value
= entry
->d_name
.name
;
421 req
->out
.numargs
= 2;
423 req
->out
.args
[0].size
= FUSE_COMPAT_ENTRY_OUT_SIZE
;
425 req
->out
.args
[0].size
= sizeof(outentry
);
426 req
->out
.args
[0].value
= &outentry
;
427 req
->out
.args
[1].size
= sizeof(outopen
);
428 req
->out
.args
[1].value
= &outopen
;
429 fuse_request_send(fc
, req
);
430 err
= req
->out
.h
.error
;
435 if (!S_ISREG(outentry
.attr
.mode
) || invalid_nodeid(outentry
.nodeid
))
438 fuse_put_request(fc
, req
);
440 ff
->nodeid
= outentry
.nodeid
;
441 ff
->open_flags
= outopen
.open_flags
;
442 inode
= fuse_iget(dir
->i_sb
, outentry
.nodeid
, outentry
.generation
,
443 &outentry
.attr
, entry_attr_timeout(&outentry
), 0);
445 flags
&= ~(O_CREAT
| O_EXCL
| O_TRUNC
);
446 fuse_sync_release(ff
, flags
);
447 fuse_queue_forget(fc
, forget
, outentry
.nodeid
, 1);
452 d_instantiate(entry
, inode
);
453 fuse_change_entry_timeout(entry
, &outentry
);
454 fuse_invalidate_attr(dir
);
455 err
= finish_open(file
, entry
, generic_file_open
, opened
);
457 fuse_sync_release(ff
, flags
);
459 file
->private_data
= fuse_file_get(ff
);
460 fuse_finish_open(inode
, file
);
467 fuse_put_request(fc
, req
);
474 static int fuse_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
475 static int fuse_atomic_open(struct inode
*dir
, struct dentry
*entry
,
476 struct file
*file
, unsigned flags
,
477 umode_t mode
, int *opened
)
480 struct fuse_conn
*fc
= get_fuse_conn(dir
);
481 struct dentry
*res
= NULL
;
483 if (d_unhashed(entry
)) {
484 res
= fuse_lookup(dir
, entry
, 0);
492 if (!(flags
& O_CREAT
) || entry
->d_inode
)
496 *opened
|= FILE_CREATED
;
501 err
= fuse_create_open(dir
, entry
, file
, flags
, mode
, opened
);
502 if (err
== -ENOSYS
) {
511 err
= fuse_mknod(dir
, entry
, mode
, 0);
515 return finish_no_open(file
, res
);
519 * Code shared between mknod, mkdir, symlink and link
521 static int create_new_entry(struct fuse_conn
*fc
, struct fuse_req
*req
,
522 struct inode
*dir
, struct dentry
*entry
,
525 struct fuse_entry_out outarg
;
528 struct fuse_forget_link
*forget
;
530 forget
= fuse_alloc_forget();
532 fuse_put_request(fc
, req
);
536 memset(&outarg
, 0, sizeof(outarg
));
537 req
->in
.h
.nodeid
= get_node_id(dir
);
538 req
->out
.numargs
= 1;
540 req
->out
.args
[0].size
= FUSE_COMPAT_ENTRY_OUT_SIZE
;
542 req
->out
.args
[0].size
= sizeof(outarg
);
543 req
->out
.args
[0].value
= &outarg
;
544 fuse_request_send(fc
, req
);
545 err
= req
->out
.h
.error
;
546 fuse_put_request(fc
, req
);
548 goto out_put_forget_req
;
551 if (invalid_nodeid(outarg
.nodeid
))
552 goto out_put_forget_req
;
554 if ((outarg
.attr
.mode
^ mode
) & S_IFMT
)
555 goto out_put_forget_req
;
557 inode
= fuse_iget(dir
->i_sb
, outarg
.nodeid
, outarg
.generation
,
558 &outarg
.attr
, entry_attr_timeout(&outarg
), 0);
560 fuse_queue_forget(fc
, forget
, outarg
.nodeid
, 1);
565 if (S_ISDIR(inode
->i_mode
)) {
566 struct dentry
*alias
;
567 mutex_lock(&fc
->inst_mutex
);
568 alias
= d_find_alias(inode
);
570 /* New directory must have moved since mkdir */
571 mutex_unlock(&fc
->inst_mutex
);
576 d_instantiate(entry
, inode
);
577 mutex_unlock(&fc
->inst_mutex
);
579 d_instantiate(entry
, inode
);
581 fuse_change_entry_timeout(entry
, &outarg
);
582 fuse_invalidate_attr(dir
);
590 static int fuse_mknod(struct inode
*dir
, struct dentry
*entry
, umode_t mode
,
593 struct fuse_mknod_in inarg
;
594 struct fuse_conn
*fc
= get_fuse_conn(dir
);
595 struct fuse_req
*req
= fuse_get_req(fc
);
600 mode
&= ~current_umask();
602 memset(&inarg
, 0, sizeof(inarg
));
604 inarg
.rdev
= new_encode_dev(rdev
);
605 inarg
.umask
= current_umask();
606 req
->in
.h
.opcode
= FUSE_MKNOD
;
608 req
->in
.args
[0].size
= fc
->minor
< 12 ? FUSE_COMPAT_MKNOD_IN_SIZE
:
610 req
->in
.args
[0].value
= &inarg
;
611 req
->in
.args
[1].size
= entry
->d_name
.len
+ 1;
612 req
->in
.args
[1].value
= entry
->d_name
.name
;
613 return create_new_entry(fc
, req
, dir
, entry
, mode
);
616 static int fuse_create(struct inode
*dir
, struct dentry
*entry
, umode_t mode
,
619 return fuse_mknod(dir
, entry
, mode
, 0);
622 static int fuse_mkdir(struct inode
*dir
, struct dentry
*entry
, umode_t mode
)
624 struct fuse_mkdir_in inarg
;
625 struct fuse_conn
*fc
= get_fuse_conn(dir
);
626 struct fuse_req
*req
= fuse_get_req(fc
);
631 mode
&= ~current_umask();
633 memset(&inarg
, 0, sizeof(inarg
));
635 inarg
.umask
= current_umask();
636 req
->in
.h
.opcode
= FUSE_MKDIR
;
638 req
->in
.args
[0].size
= sizeof(inarg
);
639 req
->in
.args
[0].value
= &inarg
;
640 req
->in
.args
[1].size
= entry
->d_name
.len
+ 1;
641 req
->in
.args
[1].value
= entry
->d_name
.name
;
642 return create_new_entry(fc
, req
, dir
, entry
, S_IFDIR
);
645 static int fuse_symlink(struct inode
*dir
, struct dentry
*entry
,
648 struct fuse_conn
*fc
= get_fuse_conn(dir
);
649 unsigned len
= strlen(link
) + 1;
650 struct fuse_req
*req
= fuse_get_req(fc
);
654 req
->in
.h
.opcode
= FUSE_SYMLINK
;
656 req
->in
.args
[0].size
= entry
->d_name
.len
+ 1;
657 req
->in
.args
[0].value
= entry
->d_name
.name
;
658 req
->in
.args
[1].size
= len
;
659 req
->in
.args
[1].value
= link
;
660 return create_new_entry(fc
, req
, dir
, entry
, S_IFLNK
);
663 static int fuse_unlink(struct inode
*dir
, struct dentry
*entry
)
666 struct fuse_conn
*fc
= get_fuse_conn(dir
);
667 struct fuse_req
*req
= fuse_get_req(fc
);
671 req
->in
.h
.opcode
= FUSE_UNLINK
;
672 req
->in
.h
.nodeid
= get_node_id(dir
);
674 req
->in
.args
[0].size
= entry
->d_name
.len
+ 1;
675 req
->in
.args
[0].value
= entry
->d_name
.name
;
676 fuse_request_send(fc
, req
);
677 err
= req
->out
.h
.error
;
678 fuse_put_request(fc
, req
);
680 struct inode
*inode
= entry
->d_inode
;
681 struct fuse_inode
*fi
= get_fuse_inode(inode
);
683 spin_lock(&fc
->lock
);
684 fi
->attr_version
= ++fc
->attr_version
;
686 spin_unlock(&fc
->lock
);
687 fuse_invalidate_attr(inode
);
688 fuse_invalidate_attr(dir
);
689 fuse_invalidate_entry_cache(entry
);
690 } else if (err
== -EINTR
)
691 fuse_invalidate_entry(entry
);
695 static int fuse_rmdir(struct inode
*dir
, struct dentry
*entry
)
698 struct fuse_conn
*fc
= get_fuse_conn(dir
);
699 struct fuse_req
*req
= fuse_get_req(fc
);
703 req
->in
.h
.opcode
= FUSE_RMDIR
;
704 req
->in
.h
.nodeid
= get_node_id(dir
);
706 req
->in
.args
[0].size
= entry
->d_name
.len
+ 1;
707 req
->in
.args
[0].value
= entry
->d_name
.name
;
708 fuse_request_send(fc
, req
);
709 err
= req
->out
.h
.error
;
710 fuse_put_request(fc
, req
);
712 clear_nlink(entry
->d_inode
);
713 fuse_invalidate_attr(dir
);
714 fuse_invalidate_entry_cache(entry
);
715 } else if (err
== -EINTR
)
716 fuse_invalidate_entry(entry
);
720 static int fuse_rename(struct inode
*olddir
, struct dentry
*oldent
,
721 struct inode
*newdir
, struct dentry
*newent
)
724 struct fuse_rename_in inarg
;
725 struct fuse_conn
*fc
= get_fuse_conn(olddir
);
726 struct fuse_req
*req
= fuse_get_req(fc
);
731 memset(&inarg
, 0, sizeof(inarg
));
732 inarg
.newdir
= get_node_id(newdir
);
733 req
->in
.h
.opcode
= FUSE_RENAME
;
734 req
->in
.h
.nodeid
= get_node_id(olddir
);
736 req
->in
.args
[0].size
= sizeof(inarg
);
737 req
->in
.args
[0].value
= &inarg
;
738 req
->in
.args
[1].size
= oldent
->d_name
.len
+ 1;
739 req
->in
.args
[1].value
= oldent
->d_name
.name
;
740 req
->in
.args
[2].size
= newent
->d_name
.len
+ 1;
741 req
->in
.args
[2].value
= newent
->d_name
.name
;
742 fuse_request_send(fc
, req
);
743 err
= req
->out
.h
.error
;
744 fuse_put_request(fc
, req
);
747 fuse_invalidate_attr(oldent
->d_inode
);
749 fuse_invalidate_attr(olddir
);
750 if (olddir
!= newdir
)
751 fuse_invalidate_attr(newdir
);
753 /* newent will end up negative */
754 if (newent
->d_inode
) {
755 fuse_invalidate_attr(newent
->d_inode
);
756 fuse_invalidate_entry_cache(newent
);
758 } else if (err
== -EINTR
) {
759 /* If request was interrupted, DEITY only knows if the
760 rename actually took place. If the invalidation
761 fails (e.g. some process has CWD under the renamed
762 directory), then there can be inconsistency between
763 the dcache and the real filesystem. Tough luck. */
764 fuse_invalidate_entry(oldent
);
766 fuse_invalidate_entry(newent
);
772 static int fuse_link(struct dentry
*entry
, struct inode
*newdir
,
773 struct dentry
*newent
)
776 struct fuse_link_in inarg
;
777 struct inode
*inode
= entry
->d_inode
;
778 struct fuse_conn
*fc
= get_fuse_conn(inode
);
779 struct fuse_req
*req
= fuse_get_req(fc
);
783 memset(&inarg
, 0, sizeof(inarg
));
784 inarg
.oldnodeid
= get_node_id(inode
);
785 req
->in
.h
.opcode
= FUSE_LINK
;
787 req
->in
.args
[0].size
= sizeof(inarg
);
788 req
->in
.args
[0].value
= &inarg
;
789 req
->in
.args
[1].size
= newent
->d_name
.len
+ 1;
790 req
->in
.args
[1].value
= newent
->d_name
.name
;
791 err
= create_new_entry(fc
, req
, newdir
, newent
, inode
->i_mode
);
792 /* Contrary to "normal" filesystems it can happen that link
793 makes two "logical" inodes point to the same "physical"
794 inode. We invalidate the attributes of the old one, so it
795 will reflect changes in the backing inode (link count,
799 struct fuse_inode
*fi
= get_fuse_inode(inode
);
801 spin_lock(&fc
->lock
);
802 fi
->attr_version
= ++fc
->attr_version
;
804 spin_unlock(&fc
->lock
);
805 fuse_invalidate_attr(inode
);
806 } else if (err
== -EINTR
) {
807 fuse_invalidate_attr(inode
);
812 static void fuse_fillattr(struct inode
*inode
, struct fuse_attr
*attr
,
815 unsigned int blkbits
;
817 stat
->dev
= inode
->i_sb
->s_dev
;
818 stat
->ino
= attr
->ino
;
819 stat
->mode
= (inode
->i_mode
& S_IFMT
) | (attr
->mode
& 07777);
820 stat
->nlink
= attr
->nlink
;
821 stat
->uid
= make_kuid(&init_user_ns
, attr
->uid
);
822 stat
->gid
= make_kgid(&init_user_ns
, attr
->gid
);
823 stat
->rdev
= inode
->i_rdev
;
824 stat
->atime
.tv_sec
= attr
->atime
;
825 stat
->atime
.tv_nsec
= attr
->atimensec
;
826 stat
->mtime
.tv_sec
= attr
->mtime
;
827 stat
->mtime
.tv_nsec
= attr
->mtimensec
;
828 stat
->ctime
.tv_sec
= attr
->ctime
;
829 stat
->ctime
.tv_nsec
= attr
->ctimensec
;
830 stat
->size
= attr
->size
;
831 stat
->blocks
= attr
->blocks
;
833 if (attr
->blksize
!= 0)
834 blkbits
= ilog2(attr
->blksize
);
836 blkbits
= inode
->i_sb
->s_blocksize_bits
;
838 stat
->blksize
= 1 << blkbits
;
841 static int fuse_do_getattr(struct inode
*inode
, struct kstat
*stat
,
845 struct fuse_getattr_in inarg
;
846 struct fuse_attr_out outarg
;
847 struct fuse_conn
*fc
= get_fuse_conn(inode
);
848 struct fuse_req
*req
;
851 req
= fuse_get_req(fc
);
855 attr_version
= fuse_get_attr_version(fc
);
857 memset(&inarg
, 0, sizeof(inarg
));
858 memset(&outarg
, 0, sizeof(outarg
));
859 /* Directories have separate file-handle space */
860 if (file
&& S_ISREG(inode
->i_mode
)) {
861 struct fuse_file
*ff
= file
->private_data
;
863 inarg
.getattr_flags
|= FUSE_GETATTR_FH
;
866 req
->in
.h
.opcode
= FUSE_GETATTR
;
867 req
->in
.h
.nodeid
= get_node_id(inode
);
869 req
->in
.args
[0].size
= sizeof(inarg
);
870 req
->in
.args
[0].value
= &inarg
;
871 req
->out
.numargs
= 1;
873 req
->out
.args
[0].size
= FUSE_COMPAT_ATTR_OUT_SIZE
;
875 req
->out
.args
[0].size
= sizeof(outarg
);
876 req
->out
.args
[0].value
= &outarg
;
877 fuse_request_send(fc
, req
);
878 err
= req
->out
.h
.error
;
879 fuse_put_request(fc
, req
);
881 if ((inode
->i_mode
^ outarg
.attr
.mode
) & S_IFMT
) {
882 make_bad_inode(inode
);
885 fuse_change_attributes(inode
, &outarg
.attr
,
886 attr_timeout(&outarg
),
889 fuse_fillattr(inode
, &outarg
.attr
, stat
);
895 int fuse_update_attributes(struct inode
*inode
, struct kstat
*stat
,
896 struct file
*file
, bool *refreshed
)
898 struct fuse_inode
*fi
= get_fuse_inode(inode
);
902 if (fi
->i_time
< get_jiffies_64()) {
904 err
= fuse_do_getattr(inode
, stat
, file
);
909 generic_fillattr(inode
, stat
);
910 stat
->mode
= fi
->orig_i_mode
;
911 stat
->ino
= fi
->orig_ino
;
915 if (refreshed
!= NULL
)
921 int fuse_reverse_inval_entry(struct super_block
*sb
, u64 parent_nodeid
,
922 u64 child_nodeid
, struct qstr
*name
)
925 struct inode
*parent
;
927 struct dentry
*entry
;
929 parent
= ilookup5(sb
, parent_nodeid
, fuse_inode_eq
, &parent_nodeid
);
933 mutex_lock(&parent
->i_mutex
);
934 if (!S_ISDIR(parent
->i_mode
))
938 dir
= d_find_alias(parent
);
942 entry
= d_lookup(dir
, name
);
947 fuse_invalidate_attr(parent
);
948 fuse_invalidate_entry(entry
);
950 if (child_nodeid
!= 0 && entry
->d_inode
) {
951 mutex_lock(&entry
->d_inode
->i_mutex
);
952 if (get_node_id(entry
->d_inode
) != child_nodeid
) {
956 if (d_mountpoint(entry
)) {
960 if (S_ISDIR(entry
->d_inode
->i_mode
)) {
961 shrink_dcache_parent(entry
);
962 if (!simple_empty(entry
)) {
966 entry
->d_inode
->i_flags
|= S_DEAD
;
969 clear_nlink(entry
->d_inode
);
972 mutex_unlock(&entry
->d_inode
->i_mutex
);
981 mutex_unlock(&parent
->i_mutex
);
987 * Calling into a user-controlled filesystem gives the filesystem
988 * daemon ptrace-like capabilities over the requester process. This
989 * means, that the filesystem daemon is able to record the exact
990 * filesystem operations performed, and can also control the behavior
991 * of the requester process in otherwise impossible ways. For example
992 * it can delay the operation for arbitrary length of time allowing
993 * DoS against the requester.
995 * For this reason only those processes can call into the filesystem,
996 * for which the owner of the mount has ptrace privilege. This
997 * excludes processes started by other users, suid or sgid processes.
999 int fuse_allow_task(struct fuse_conn
*fc
, struct task_struct
*task
)
1001 const struct cred
*cred
;
1004 if (fc
->flags
& FUSE_ALLOW_OTHER
)
1009 cred
= __task_cred(task
);
1010 if (uid_eq(cred
->euid
, fc
->user_id
) &&
1011 uid_eq(cred
->suid
, fc
->user_id
) &&
1012 uid_eq(cred
->uid
, fc
->user_id
) &&
1013 gid_eq(cred
->egid
, fc
->group_id
) &&
1014 gid_eq(cred
->sgid
, fc
->group_id
) &&
1015 gid_eq(cred
->gid
, fc
->group_id
))
1022 static int fuse_access(struct inode
*inode
, int mask
)
1024 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1025 struct fuse_req
*req
;
1026 struct fuse_access_in inarg
;
1032 req
= fuse_get_req(fc
);
1034 return PTR_ERR(req
);
1036 memset(&inarg
, 0, sizeof(inarg
));
1037 inarg
.mask
= mask
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
);
1038 req
->in
.h
.opcode
= FUSE_ACCESS
;
1039 req
->in
.h
.nodeid
= get_node_id(inode
);
1040 req
->in
.numargs
= 1;
1041 req
->in
.args
[0].size
= sizeof(inarg
);
1042 req
->in
.args
[0].value
= &inarg
;
1043 fuse_request_send(fc
, req
);
1044 err
= req
->out
.h
.error
;
1045 fuse_put_request(fc
, req
);
1046 if (err
== -ENOSYS
) {
1053 static int fuse_perm_getattr(struct inode
*inode
, int mask
)
1055 if (mask
& MAY_NOT_BLOCK
)
1058 return fuse_do_getattr(inode
, NULL
, NULL
);
1062 * Check permission. The two basic access models of FUSE are:
1064 * 1) Local access checking ('default_permissions' mount option) based
1065 * on file mode. This is the plain old disk filesystem permission
1068 * 2) "Remote" access checking, where server is responsible for
1069 * checking permission in each inode operation. An exception to this
1070 * is if ->permission() was invoked from sys_access() in which case an
1071 * access request is sent. Execute permission is still checked
1072 * locally based on file mode.
1074 static int fuse_permission(struct inode
*inode
, int mask
)
1076 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1077 bool refreshed
= false;
1080 if (!fuse_allow_task(fc
, current
))
1084 * If attributes are needed, refresh them before proceeding
1086 if ((fc
->flags
& FUSE_DEFAULT_PERMISSIONS
) ||
1087 ((mask
& MAY_EXEC
) && S_ISREG(inode
->i_mode
))) {
1088 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1090 if (fi
->i_time
< get_jiffies_64()) {
1093 err
= fuse_perm_getattr(inode
, mask
);
1099 if (fc
->flags
& FUSE_DEFAULT_PERMISSIONS
) {
1100 err
= generic_permission(inode
, mask
);
1102 /* If permission is denied, try to refresh file
1103 attributes. This is also needed, because the root
1104 node will at first have no permissions */
1105 if (err
== -EACCES
&& !refreshed
) {
1106 err
= fuse_perm_getattr(inode
, mask
);
1108 err
= generic_permission(inode
, mask
);
1111 /* Note: the opposite of the above test does not
1112 exist. So if permissions are revoked this won't be
1113 noticed immediately, only after the attribute
1114 timeout has expired */
1115 } else if (mask
& (MAY_ACCESS
| MAY_CHDIR
)) {
1116 if (mask
& MAY_NOT_BLOCK
)
1119 err
= fuse_access(inode
, mask
);
1120 } else if ((mask
& MAY_EXEC
) && S_ISREG(inode
->i_mode
)) {
1121 if (!(inode
->i_mode
& S_IXUGO
)) {
1125 err
= fuse_perm_getattr(inode
, mask
);
1126 if (!err
&& !(inode
->i_mode
& S_IXUGO
))
1133 static int parse_dirfile(char *buf
, size_t nbytes
, struct file
*file
,
1134 void *dstbuf
, filldir_t filldir
)
1136 while (nbytes
>= FUSE_NAME_OFFSET
) {
1137 struct fuse_dirent
*dirent
= (struct fuse_dirent
*) buf
;
1138 size_t reclen
= FUSE_DIRENT_SIZE(dirent
);
1140 if (!dirent
->namelen
|| dirent
->namelen
> FUSE_NAME_MAX
)
1142 if (reclen
> nbytes
)
1145 over
= filldir(dstbuf
, dirent
->name
, dirent
->namelen
,
1146 file
->f_pos
, dirent
->ino
, dirent
->type
);
1152 file
->f_pos
= dirent
->off
;
1158 static int fuse_direntplus_link(struct file
*file
,
1159 struct fuse_direntplus
*direntplus
,
1163 struct fuse_entry_out
*o
= &direntplus
->entry_out
;
1164 struct fuse_dirent
*dirent
= &direntplus
->dirent
;
1165 struct dentry
*parent
= file
->f_path
.dentry
;
1166 struct qstr name
= QSTR_INIT(dirent
->name
, dirent
->namelen
);
1167 struct dentry
*dentry
;
1168 struct dentry
*alias
;
1169 struct inode
*dir
= parent
->d_inode
;
1170 struct fuse_conn
*fc
;
1171 struct inode
*inode
;
1175 * Unlike in the case of fuse_lookup, zero nodeid does not mean
1176 * ENOENT. Instead, it only means the userspace filesystem did
1177 * not want to return attributes/handle for this entry.
1184 if (name
.name
[0] == '.') {
1186 * We could potentially refresh the attributes of the directory
1191 if (name
.name
[1] == '.' && name
.len
== 2)
1194 fc
= get_fuse_conn(dir
);
1196 name
.hash
= full_name_hash(name
.name
, name
.len
);
1197 dentry
= d_lookup(parent
, &name
);
1198 if (dentry
&& dentry
->d_inode
) {
1199 inode
= dentry
->d_inode
;
1200 if (get_node_id(inode
) == o
->nodeid
) {
1201 struct fuse_inode
*fi
;
1202 fi
= get_fuse_inode(inode
);
1203 spin_lock(&fc
->lock
);
1205 spin_unlock(&fc
->lock
);
1208 * The other branch to 'found' comes via fuse_iget()
1209 * which bumps nlookup inside
1213 err
= d_invalidate(dentry
);
1220 dentry
= d_alloc(parent
, &name
);
1225 inode
= fuse_iget(dir
->i_sb
, o
->nodeid
, o
->generation
,
1226 &o
->attr
, entry_attr_timeout(o
), attr_version
);
1230 alias
= d_materialise_unique(dentry
, inode
);
1231 err
= PTR_ERR(alias
);
1240 fuse_change_attributes(inode
, &o
->attr
, entry_attr_timeout(o
),
1243 fuse_change_entry_timeout(dentry
, o
);
1252 static int parse_dirplusfile(char *buf
, size_t nbytes
, struct file
*file
,
1253 void *dstbuf
, filldir_t filldir
, u64 attr_version
)
1255 struct fuse_direntplus
*direntplus
;
1256 struct fuse_dirent
*dirent
;
1261 while (nbytes
>= FUSE_NAME_OFFSET_DIRENTPLUS
) {
1262 direntplus
= (struct fuse_direntplus
*) buf
;
1263 dirent
= &direntplus
->dirent
;
1264 reclen
= FUSE_DIRENTPLUS_SIZE(direntplus
);
1266 if (!dirent
->namelen
|| dirent
->namelen
> FUSE_NAME_MAX
)
1268 if (reclen
> nbytes
)
1272 /* We fill entries into dstbuf only as much as
1273 it can hold. But we still continue iterating
1274 over remaining entries to link them. If not,
1275 we need to send a FORGET for each of those
1276 which we did not link.
1278 over
= filldir(dstbuf
, dirent
->name
, dirent
->namelen
,
1279 file
->f_pos
, dirent
->ino
,
1281 file
->f_pos
= dirent
->off
;
1287 ret
= fuse_direntplus_link(file
, direntplus
, attr_version
);
1289 fuse_force_forget(file
, direntplus
->entry_out
.nodeid
);
1295 static int fuse_readdir(struct file
*file
, void *dstbuf
, filldir_t filldir
)
1300 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1301 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1302 struct fuse_req
*req
;
1303 u64 attr_version
= 0;
1305 if (is_bad_inode(inode
))
1308 req
= fuse_get_req(fc
);
1310 return PTR_ERR(req
);
1312 page
= alloc_page(GFP_KERNEL
);
1314 fuse_put_request(fc
, req
);
1317 req
->out
.argpages
= 1;
1319 req
->pages
[0] = page
;
1320 if (fc
->do_readdirplus
) {
1321 attr_version
= fuse_get_attr_version(fc
);
1322 fuse_read_fill(req
, file
, file
->f_pos
, PAGE_SIZE
,
1325 fuse_read_fill(req
, file
, file
->f_pos
, PAGE_SIZE
,
1328 fuse_request_send(fc
, req
);
1329 nbytes
= req
->out
.args
[0].size
;
1330 err
= req
->out
.h
.error
;
1331 fuse_put_request(fc
, req
);
1333 if (fc
->do_readdirplus
) {
1334 err
= parse_dirplusfile(page_address(page
), nbytes
,
1335 file
, dstbuf
, filldir
,
1338 err
= parse_dirfile(page_address(page
), nbytes
, file
,
1344 fuse_invalidate_attr(inode
); /* atime changed */
1348 static char *read_link(struct dentry
*dentry
)
1350 struct inode
*inode
= dentry
->d_inode
;
1351 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1352 struct fuse_req
*req
= fuse_get_req(fc
);
1356 return ERR_CAST(req
);
1358 link
= (char *) __get_free_page(GFP_KERNEL
);
1360 link
= ERR_PTR(-ENOMEM
);
1363 req
->in
.h
.opcode
= FUSE_READLINK
;
1364 req
->in
.h
.nodeid
= get_node_id(inode
);
1365 req
->out
.argvar
= 1;
1366 req
->out
.numargs
= 1;
1367 req
->out
.args
[0].size
= PAGE_SIZE
- 1;
1368 req
->out
.args
[0].value
= link
;
1369 fuse_request_send(fc
, req
);
1370 if (req
->out
.h
.error
) {
1371 free_page((unsigned long) link
);
1372 link
= ERR_PTR(req
->out
.h
.error
);
1374 link
[req
->out
.args
[0].size
] = '\0';
1376 fuse_put_request(fc
, req
);
1377 fuse_invalidate_attr(inode
); /* atime changed */
1381 static void free_link(char *link
)
1384 free_page((unsigned long) link
);
1387 static void *fuse_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1389 nd_set_link(nd
, read_link(dentry
));
1393 static void fuse_put_link(struct dentry
*dentry
, struct nameidata
*nd
, void *c
)
1395 free_link(nd_get_link(nd
));
1398 static int fuse_dir_open(struct inode
*inode
, struct file
*file
)
1400 return fuse_open_common(inode
, file
, true);
1403 static int fuse_dir_release(struct inode
*inode
, struct file
*file
)
1405 fuse_release_common(file
, FUSE_RELEASEDIR
);
1410 static int fuse_dir_fsync(struct file
*file
, loff_t start
, loff_t end
,
1413 return fuse_fsync_common(file
, start
, end
, datasync
, 1);
1416 static long fuse_dir_ioctl(struct file
*file
, unsigned int cmd
,
1419 struct fuse_conn
*fc
= get_fuse_conn(file
->f_mapping
->host
);
1421 /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
1425 return fuse_ioctl_common(file
, cmd
, arg
, FUSE_IOCTL_DIR
);
1428 static long fuse_dir_compat_ioctl(struct file
*file
, unsigned int cmd
,
1431 struct fuse_conn
*fc
= get_fuse_conn(file
->f_mapping
->host
);
1436 return fuse_ioctl_common(file
, cmd
, arg
,
1437 FUSE_IOCTL_COMPAT
| FUSE_IOCTL_DIR
);
1440 static bool update_mtime(unsigned ivalid
)
1442 /* Always update if mtime is explicitly set */
1443 if (ivalid
& ATTR_MTIME_SET
)
1446 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1447 if ((ivalid
& ATTR_SIZE
) && (ivalid
& (ATTR_OPEN
| ATTR_FILE
)))
1450 /* In all other cases update */
1454 static void iattr_to_fattr(struct iattr
*iattr
, struct fuse_setattr_in
*arg
)
1456 unsigned ivalid
= iattr
->ia_valid
;
1458 if (ivalid
& ATTR_MODE
)
1459 arg
->valid
|= FATTR_MODE
, arg
->mode
= iattr
->ia_mode
;
1460 if (ivalid
& ATTR_UID
)
1461 arg
->valid
|= FATTR_UID
, arg
->uid
= from_kuid(&init_user_ns
, iattr
->ia_uid
);
1462 if (ivalid
& ATTR_GID
)
1463 arg
->valid
|= FATTR_GID
, arg
->gid
= from_kgid(&init_user_ns
, iattr
->ia_gid
);
1464 if (ivalid
& ATTR_SIZE
)
1465 arg
->valid
|= FATTR_SIZE
, arg
->size
= iattr
->ia_size
;
1466 if (ivalid
& ATTR_ATIME
) {
1467 arg
->valid
|= FATTR_ATIME
;
1468 arg
->atime
= iattr
->ia_atime
.tv_sec
;
1469 arg
->atimensec
= iattr
->ia_atime
.tv_nsec
;
1470 if (!(ivalid
& ATTR_ATIME_SET
))
1471 arg
->valid
|= FATTR_ATIME_NOW
;
1473 if ((ivalid
& ATTR_MTIME
) && update_mtime(ivalid
)) {
1474 arg
->valid
|= FATTR_MTIME
;
1475 arg
->mtime
= iattr
->ia_mtime
.tv_sec
;
1476 arg
->mtimensec
= iattr
->ia_mtime
.tv_nsec
;
1477 if (!(ivalid
& ATTR_MTIME_SET
))
1478 arg
->valid
|= FATTR_MTIME_NOW
;
1483 * Prevent concurrent writepages on inode
1485 * This is done by adding a negative bias to the inode write counter
1486 * and waiting for all pending writes to finish.
1488 void fuse_set_nowrite(struct inode
*inode
)
1490 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1491 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1493 BUG_ON(!mutex_is_locked(&inode
->i_mutex
));
1495 spin_lock(&fc
->lock
);
1496 BUG_ON(fi
->writectr
< 0);
1497 fi
->writectr
+= FUSE_NOWRITE
;
1498 spin_unlock(&fc
->lock
);
1499 wait_event(fi
->page_waitq
, fi
->writectr
== FUSE_NOWRITE
);
1503 * Allow writepages on inode
1505 * Remove the bias from the writecounter and send any queued
1508 static void __fuse_release_nowrite(struct inode
*inode
)
1510 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1512 BUG_ON(fi
->writectr
!= FUSE_NOWRITE
);
1514 fuse_flush_writepages(inode
);
1517 void fuse_release_nowrite(struct inode
*inode
)
1519 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1521 spin_lock(&fc
->lock
);
1522 __fuse_release_nowrite(inode
);
1523 spin_unlock(&fc
->lock
);
1527 * Set attributes, and at the same time refresh them.
1529 * Truncation is slightly complicated, because the 'truncate' request
1530 * may fail, in which case we don't want to touch the mapping.
1531 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1532 * and the actual truncation by hand.
1534 static int fuse_do_setattr(struct dentry
*entry
, struct iattr
*attr
,
1537 struct inode
*inode
= entry
->d_inode
;
1538 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1539 struct fuse_req
*req
;
1540 struct fuse_setattr_in inarg
;
1541 struct fuse_attr_out outarg
;
1542 bool is_truncate
= false;
1546 if (!fuse_allow_task(fc
, current
))
1549 if (!(fc
->flags
& FUSE_DEFAULT_PERMISSIONS
))
1550 attr
->ia_valid
|= ATTR_FORCE
;
1552 err
= inode_change_ok(inode
, attr
);
1556 if (attr
->ia_valid
& ATTR_OPEN
) {
1557 if (fc
->atomic_o_trunc
)
1562 if (attr
->ia_valid
& ATTR_SIZE
)
1565 req
= fuse_get_req(fc
);
1567 return PTR_ERR(req
);
1570 fuse_set_nowrite(inode
);
1572 memset(&inarg
, 0, sizeof(inarg
));
1573 memset(&outarg
, 0, sizeof(outarg
));
1574 iattr_to_fattr(attr
, &inarg
);
1576 struct fuse_file
*ff
= file
->private_data
;
1577 inarg
.valid
|= FATTR_FH
;
1580 if (attr
->ia_valid
& ATTR_SIZE
) {
1581 /* For mandatory locking in truncate */
1582 inarg
.valid
|= FATTR_LOCKOWNER
;
1583 inarg
.lock_owner
= fuse_lock_owner_id(fc
, current
->files
);
1585 req
->in
.h
.opcode
= FUSE_SETATTR
;
1586 req
->in
.h
.nodeid
= get_node_id(inode
);
1587 req
->in
.numargs
= 1;
1588 req
->in
.args
[0].size
= sizeof(inarg
);
1589 req
->in
.args
[0].value
= &inarg
;
1590 req
->out
.numargs
= 1;
1592 req
->out
.args
[0].size
= FUSE_COMPAT_ATTR_OUT_SIZE
;
1594 req
->out
.args
[0].size
= sizeof(outarg
);
1595 req
->out
.args
[0].value
= &outarg
;
1596 fuse_request_send(fc
, req
);
1597 err
= req
->out
.h
.error
;
1598 fuse_put_request(fc
, req
);
1601 fuse_invalidate_attr(inode
);
1605 if ((inode
->i_mode
^ outarg
.attr
.mode
) & S_IFMT
) {
1606 make_bad_inode(inode
);
1611 spin_lock(&fc
->lock
);
1612 fuse_change_attributes_common(inode
, &outarg
.attr
,
1613 attr_timeout(&outarg
));
1614 oldsize
= inode
->i_size
;
1615 i_size_write(inode
, outarg
.attr
.size
);
1618 /* NOTE: this may release/reacquire fc->lock */
1619 __fuse_release_nowrite(inode
);
1621 spin_unlock(&fc
->lock
);
1624 * Only call invalidate_inode_pages2() after removing
1625 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1627 if (S_ISREG(inode
->i_mode
) && oldsize
!= outarg
.attr
.size
) {
1628 truncate_pagecache(inode
, oldsize
, outarg
.attr
.size
);
1629 invalidate_inode_pages2(inode
->i_mapping
);
1636 fuse_release_nowrite(inode
);
1641 static int fuse_setattr(struct dentry
*entry
, struct iattr
*attr
)
1643 if (attr
->ia_valid
& ATTR_FILE
)
1644 return fuse_do_setattr(entry
, attr
, attr
->ia_file
);
1646 return fuse_do_setattr(entry
, attr
, NULL
);
1649 static int fuse_getattr(struct vfsmount
*mnt
, struct dentry
*entry
,
1652 struct inode
*inode
= entry
->d_inode
;
1653 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1655 if (!fuse_allow_task(fc
, current
))
1658 return fuse_update_attributes(inode
, stat
, NULL
, NULL
);
1661 static int fuse_setxattr(struct dentry
*entry
, const char *name
,
1662 const void *value
, size_t size
, int flags
)
1664 struct inode
*inode
= entry
->d_inode
;
1665 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1666 struct fuse_req
*req
;
1667 struct fuse_setxattr_in inarg
;
1670 if (fc
->no_setxattr
)
1673 req
= fuse_get_req(fc
);
1675 return PTR_ERR(req
);
1677 memset(&inarg
, 0, sizeof(inarg
));
1679 inarg
.flags
= flags
;
1680 req
->in
.h
.opcode
= FUSE_SETXATTR
;
1681 req
->in
.h
.nodeid
= get_node_id(inode
);
1682 req
->in
.numargs
= 3;
1683 req
->in
.args
[0].size
= sizeof(inarg
);
1684 req
->in
.args
[0].value
= &inarg
;
1685 req
->in
.args
[1].size
= strlen(name
) + 1;
1686 req
->in
.args
[1].value
= name
;
1687 req
->in
.args
[2].size
= size
;
1688 req
->in
.args
[2].value
= value
;
1689 fuse_request_send(fc
, req
);
1690 err
= req
->out
.h
.error
;
1691 fuse_put_request(fc
, req
);
1692 if (err
== -ENOSYS
) {
1693 fc
->no_setxattr
= 1;
1699 static ssize_t
fuse_getxattr(struct dentry
*entry
, const char *name
,
1700 void *value
, size_t size
)
1702 struct inode
*inode
= entry
->d_inode
;
1703 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1704 struct fuse_req
*req
;
1705 struct fuse_getxattr_in inarg
;
1706 struct fuse_getxattr_out outarg
;
1709 if (fc
->no_getxattr
)
1712 req
= fuse_get_req(fc
);
1714 return PTR_ERR(req
);
1716 memset(&inarg
, 0, sizeof(inarg
));
1718 req
->in
.h
.opcode
= FUSE_GETXATTR
;
1719 req
->in
.h
.nodeid
= get_node_id(inode
);
1720 req
->in
.numargs
= 2;
1721 req
->in
.args
[0].size
= sizeof(inarg
);
1722 req
->in
.args
[0].value
= &inarg
;
1723 req
->in
.args
[1].size
= strlen(name
) + 1;
1724 req
->in
.args
[1].value
= name
;
1725 /* This is really two different operations rolled into one */
1726 req
->out
.numargs
= 1;
1728 req
->out
.argvar
= 1;
1729 req
->out
.args
[0].size
= size
;
1730 req
->out
.args
[0].value
= value
;
1732 req
->out
.args
[0].size
= sizeof(outarg
);
1733 req
->out
.args
[0].value
= &outarg
;
1735 fuse_request_send(fc
, req
);
1736 ret
= req
->out
.h
.error
;
1738 ret
= size
? req
->out
.args
[0].size
: outarg
.size
;
1740 if (ret
== -ENOSYS
) {
1741 fc
->no_getxattr
= 1;
1745 fuse_put_request(fc
, req
);
1749 static ssize_t
fuse_listxattr(struct dentry
*entry
, char *list
, size_t size
)
1751 struct inode
*inode
= entry
->d_inode
;
1752 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1753 struct fuse_req
*req
;
1754 struct fuse_getxattr_in inarg
;
1755 struct fuse_getxattr_out outarg
;
1758 if (!fuse_allow_task(fc
, current
))
1761 if (fc
->no_listxattr
)
1764 req
= fuse_get_req(fc
);
1766 return PTR_ERR(req
);
1768 memset(&inarg
, 0, sizeof(inarg
));
1770 req
->in
.h
.opcode
= FUSE_LISTXATTR
;
1771 req
->in
.h
.nodeid
= get_node_id(inode
);
1772 req
->in
.numargs
= 1;
1773 req
->in
.args
[0].size
= sizeof(inarg
);
1774 req
->in
.args
[0].value
= &inarg
;
1775 /* This is really two different operations rolled into one */
1776 req
->out
.numargs
= 1;
1778 req
->out
.argvar
= 1;
1779 req
->out
.args
[0].size
= size
;
1780 req
->out
.args
[0].value
= list
;
1782 req
->out
.args
[0].size
= sizeof(outarg
);
1783 req
->out
.args
[0].value
= &outarg
;
1785 fuse_request_send(fc
, req
);
1786 ret
= req
->out
.h
.error
;
1788 ret
= size
? req
->out
.args
[0].size
: outarg
.size
;
1790 if (ret
== -ENOSYS
) {
1791 fc
->no_listxattr
= 1;
1795 fuse_put_request(fc
, req
);
1799 static int fuse_removexattr(struct dentry
*entry
, const char *name
)
1801 struct inode
*inode
= entry
->d_inode
;
1802 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1803 struct fuse_req
*req
;
1806 if (fc
->no_removexattr
)
1809 req
= fuse_get_req(fc
);
1811 return PTR_ERR(req
);
1813 req
->in
.h
.opcode
= FUSE_REMOVEXATTR
;
1814 req
->in
.h
.nodeid
= get_node_id(inode
);
1815 req
->in
.numargs
= 1;
1816 req
->in
.args
[0].size
= strlen(name
) + 1;
1817 req
->in
.args
[0].value
= name
;
1818 fuse_request_send(fc
, req
);
1819 err
= req
->out
.h
.error
;
1820 fuse_put_request(fc
, req
);
1821 if (err
== -ENOSYS
) {
1822 fc
->no_removexattr
= 1;
1828 static const struct inode_operations fuse_dir_inode_operations
= {
1829 .lookup
= fuse_lookup
,
1830 .mkdir
= fuse_mkdir
,
1831 .symlink
= fuse_symlink
,
1832 .unlink
= fuse_unlink
,
1833 .rmdir
= fuse_rmdir
,
1834 .rename
= fuse_rename
,
1836 .setattr
= fuse_setattr
,
1837 .create
= fuse_create
,
1838 .atomic_open
= fuse_atomic_open
,
1839 .mknod
= fuse_mknod
,
1840 .permission
= fuse_permission
,
1841 .getattr
= fuse_getattr
,
1842 .setxattr
= fuse_setxattr
,
1843 .getxattr
= fuse_getxattr
,
1844 .listxattr
= fuse_listxattr
,
1845 .removexattr
= fuse_removexattr
,
1848 static const struct file_operations fuse_dir_operations
= {
1849 .llseek
= generic_file_llseek
,
1850 .read
= generic_read_dir
,
1851 .readdir
= fuse_readdir
,
1852 .open
= fuse_dir_open
,
1853 .release
= fuse_dir_release
,
1854 .fsync
= fuse_dir_fsync
,
1855 .unlocked_ioctl
= fuse_dir_ioctl
,
1856 .compat_ioctl
= fuse_dir_compat_ioctl
,
1859 static const struct inode_operations fuse_common_inode_operations
= {
1860 .setattr
= fuse_setattr
,
1861 .permission
= fuse_permission
,
1862 .getattr
= fuse_getattr
,
1863 .setxattr
= fuse_setxattr
,
1864 .getxattr
= fuse_getxattr
,
1865 .listxattr
= fuse_listxattr
,
1866 .removexattr
= fuse_removexattr
,
1869 static const struct inode_operations fuse_symlink_inode_operations
= {
1870 .setattr
= fuse_setattr
,
1871 .follow_link
= fuse_follow_link
,
1872 .put_link
= fuse_put_link
,
1873 .readlink
= generic_readlink
,
1874 .getattr
= fuse_getattr
,
1875 .setxattr
= fuse_setxattr
,
1876 .getxattr
= fuse_getxattr
,
1877 .listxattr
= fuse_listxattr
,
1878 .removexattr
= fuse_removexattr
,
1881 void fuse_init_common(struct inode
*inode
)
1883 inode
->i_op
= &fuse_common_inode_operations
;
1886 void fuse_init_dir(struct inode
*inode
)
1888 inode
->i_op
= &fuse_dir_inode_operations
;
1889 inode
->i_fop
= &fuse_dir_operations
;
1892 void fuse_init_symlink(struct inode
*inode
)
1894 inode
->i_op
= &fuse_symlink_inode_operations
;