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
, struct nameidata
*nd
)
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 (nd
&& (nd
->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 (!list_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
,
319 struct nameidata
*nd
)
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 umode_t mode
, struct nameidata
*nd
)
377 struct fuse_conn
*fc
= get_fuse_conn(dir
);
378 struct fuse_req
*req
;
379 struct fuse_forget_link
*forget
;
380 struct fuse_create_in inarg
;
381 struct fuse_open_out outopen
;
382 struct fuse_entry_out outentry
;
383 struct fuse_file
*ff
;
385 int flags
= nd
->intent
.open
.flags
;
390 if (flags
& O_DIRECT
)
393 forget
= fuse_alloc_forget();
397 req
= fuse_get_req(fc
);
400 goto out_put_forget_req
;
403 ff
= fuse_file_alloc(fc
);
405 goto out_put_request
;
408 mode
&= ~current_umask();
411 memset(&inarg
, 0, sizeof(inarg
));
412 memset(&outentry
, 0, sizeof(outentry
));
415 inarg
.umask
= current_umask();
416 req
->in
.h
.opcode
= FUSE_CREATE
;
417 req
->in
.h
.nodeid
= get_node_id(dir
);
419 req
->in
.args
[0].size
= fc
->minor
< 12 ? sizeof(struct fuse_open_in
) :
421 req
->in
.args
[0].value
= &inarg
;
422 req
->in
.args
[1].size
= entry
->d_name
.len
+ 1;
423 req
->in
.args
[1].value
= entry
->d_name
.name
;
424 req
->out
.numargs
= 2;
426 req
->out
.args
[0].size
= FUSE_COMPAT_ENTRY_OUT_SIZE
;
428 req
->out
.args
[0].size
= sizeof(outentry
);
429 req
->out
.args
[0].value
= &outentry
;
430 req
->out
.args
[1].size
= sizeof(outopen
);
431 req
->out
.args
[1].value
= &outopen
;
432 fuse_request_send(fc
, req
);
433 err
= req
->out
.h
.error
;
441 if (!S_ISREG(outentry
.attr
.mode
) || invalid_nodeid(outentry
.nodeid
))
444 fuse_put_request(fc
, req
);
446 ff
->nodeid
= outentry
.nodeid
;
447 ff
->open_flags
= outopen
.open_flags
;
448 inode
= fuse_iget(dir
->i_sb
, outentry
.nodeid
, outentry
.generation
,
449 &outentry
.attr
, entry_attr_timeout(&outentry
), 0);
451 flags
&= ~(O_CREAT
| O_EXCL
| O_TRUNC
);
452 fuse_sync_release(ff
, flags
);
453 fuse_queue_forget(fc
, forget
, outentry
.nodeid
, 1);
457 d_instantiate(entry
, inode
);
458 fuse_change_entry_timeout(entry
, &outentry
);
459 fuse_invalidate_attr(dir
);
460 file
= lookup_instantiate_filp(nd
, entry
, generic_file_open
);
462 fuse_sync_release(ff
, flags
);
463 return PTR_ERR(file
);
465 file
->private_data
= fuse_file_get(ff
);
466 fuse_finish_open(inode
, file
);
472 fuse_put_request(fc
, req
);
479 * Code shared between mknod, mkdir, symlink and link
481 static int create_new_entry(struct fuse_conn
*fc
, struct fuse_req
*req
,
482 struct inode
*dir
, struct dentry
*entry
,
485 struct fuse_entry_out outarg
;
488 struct fuse_forget_link
*forget
;
490 forget
= fuse_alloc_forget();
492 fuse_put_request(fc
, req
);
496 memset(&outarg
, 0, sizeof(outarg
));
497 req
->in
.h
.nodeid
= get_node_id(dir
);
498 req
->out
.numargs
= 1;
500 req
->out
.args
[0].size
= FUSE_COMPAT_ENTRY_OUT_SIZE
;
502 req
->out
.args
[0].size
= sizeof(outarg
);
503 req
->out
.args
[0].value
= &outarg
;
504 fuse_request_send(fc
, req
);
505 err
= req
->out
.h
.error
;
506 fuse_put_request(fc
, req
);
508 goto out_put_forget_req
;
511 if (invalid_nodeid(outarg
.nodeid
))
512 goto out_put_forget_req
;
514 if ((outarg
.attr
.mode
^ mode
) & S_IFMT
)
515 goto out_put_forget_req
;
517 inode
= fuse_iget(dir
->i_sb
, outarg
.nodeid
, outarg
.generation
,
518 &outarg
.attr
, entry_attr_timeout(&outarg
), 0);
520 fuse_queue_forget(fc
, forget
, outarg
.nodeid
, 1);
525 if (S_ISDIR(inode
->i_mode
)) {
526 struct dentry
*alias
;
527 mutex_lock(&fc
->inst_mutex
);
528 alias
= d_find_alias(inode
);
530 /* New directory must have moved since mkdir */
531 mutex_unlock(&fc
->inst_mutex
);
536 d_instantiate(entry
, inode
);
537 mutex_unlock(&fc
->inst_mutex
);
539 d_instantiate(entry
, inode
);
541 fuse_change_entry_timeout(entry
, &outarg
);
542 fuse_invalidate_attr(dir
);
550 static int fuse_mknod(struct inode
*dir
, struct dentry
*entry
, umode_t mode
,
553 struct fuse_mknod_in inarg
;
554 struct fuse_conn
*fc
= get_fuse_conn(dir
);
555 struct fuse_req
*req
= fuse_get_req(fc
);
560 mode
&= ~current_umask();
562 memset(&inarg
, 0, sizeof(inarg
));
564 inarg
.rdev
= new_encode_dev(rdev
);
565 inarg
.umask
= current_umask();
566 req
->in
.h
.opcode
= FUSE_MKNOD
;
568 req
->in
.args
[0].size
= fc
->minor
< 12 ? FUSE_COMPAT_MKNOD_IN_SIZE
:
570 req
->in
.args
[0].value
= &inarg
;
571 req
->in
.args
[1].size
= entry
->d_name
.len
+ 1;
572 req
->in
.args
[1].value
= entry
->d_name
.name
;
573 return create_new_entry(fc
, req
, dir
, entry
, mode
);
576 static int fuse_create(struct inode
*dir
, struct dentry
*entry
, umode_t mode
,
577 struct nameidata
*nd
)
580 int err
= fuse_create_open(dir
, entry
, mode
, nd
);
583 /* Fall back on mknod */
585 return fuse_mknod(dir
, entry
, mode
, 0);
588 static int fuse_mkdir(struct inode
*dir
, struct dentry
*entry
, umode_t mode
)
590 struct fuse_mkdir_in inarg
;
591 struct fuse_conn
*fc
= get_fuse_conn(dir
);
592 struct fuse_req
*req
= fuse_get_req(fc
);
597 mode
&= ~current_umask();
599 memset(&inarg
, 0, sizeof(inarg
));
601 inarg
.umask
= current_umask();
602 req
->in
.h
.opcode
= FUSE_MKDIR
;
604 req
->in
.args
[0].size
= sizeof(inarg
);
605 req
->in
.args
[0].value
= &inarg
;
606 req
->in
.args
[1].size
= entry
->d_name
.len
+ 1;
607 req
->in
.args
[1].value
= entry
->d_name
.name
;
608 return create_new_entry(fc
, req
, dir
, entry
, S_IFDIR
);
611 static int fuse_symlink(struct inode
*dir
, struct dentry
*entry
,
614 struct fuse_conn
*fc
= get_fuse_conn(dir
);
615 unsigned len
= strlen(link
) + 1;
616 struct fuse_req
*req
= fuse_get_req(fc
);
620 req
->in
.h
.opcode
= FUSE_SYMLINK
;
622 req
->in
.args
[0].size
= entry
->d_name
.len
+ 1;
623 req
->in
.args
[0].value
= entry
->d_name
.name
;
624 req
->in
.args
[1].size
= len
;
625 req
->in
.args
[1].value
= link
;
626 return create_new_entry(fc
, req
, dir
, entry
, S_IFLNK
);
629 static int fuse_unlink(struct inode
*dir
, struct dentry
*entry
)
632 struct fuse_conn
*fc
= get_fuse_conn(dir
);
633 struct fuse_req
*req
= fuse_get_req(fc
);
637 req
->in
.h
.opcode
= FUSE_UNLINK
;
638 req
->in
.h
.nodeid
= get_node_id(dir
);
640 req
->in
.args
[0].size
= entry
->d_name
.len
+ 1;
641 req
->in
.args
[0].value
= entry
->d_name
.name
;
642 fuse_request_send(fc
, req
);
643 err
= req
->out
.h
.error
;
644 fuse_put_request(fc
, req
);
646 struct inode
*inode
= entry
->d_inode
;
649 * Set nlink to zero so the inode can be cleared, if the inode
650 * does have more links this will be discovered at the next
654 fuse_invalidate_attr(inode
);
655 fuse_invalidate_attr(dir
);
656 fuse_invalidate_entry_cache(entry
);
657 } else if (err
== -EINTR
)
658 fuse_invalidate_entry(entry
);
662 static int fuse_rmdir(struct inode
*dir
, struct dentry
*entry
)
665 struct fuse_conn
*fc
= get_fuse_conn(dir
);
666 struct fuse_req
*req
= fuse_get_req(fc
);
670 req
->in
.h
.opcode
= FUSE_RMDIR
;
671 req
->in
.h
.nodeid
= get_node_id(dir
);
673 req
->in
.args
[0].size
= entry
->d_name
.len
+ 1;
674 req
->in
.args
[0].value
= entry
->d_name
.name
;
675 fuse_request_send(fc
, req
);
676 err
= req
->out
.h
.error
;
677 fuse_put_request(fc
, req
);
679 clear_nlink(entry
->d_inode
);
680 fuse_invalidate_attr(dir
);
681 fuse_invalidate_entry_cache(entry
);
682 } else if (err
== -EINTR
)
683 fuse_invalidate_entry(entry
);
687 static int fuse_rename(struct inode
*olddir
, struct dentry
*oldent
,
688 struct inode
*newdir
, struct dentry
*newent
)
691 struct fuse_rename_in inarg
;
692 struct fuse_conn
*fc
= get_fuse_conn(olddir
);
693 struct fuse_req
*req
= fuse_get_req(fc
);
698 memset(&inarg
, 0, sizeof(inarg
));
699 inarg
.newdir
= get_node_id(newdir
);
700 req
->in
.h
.opcode
= FUSE_RENAME
;
701 req
->in
.h
.nodeid
= get_node_id(olddir
);
703 req
->in
.args
[0].size
= sizeof(inarg
);
704 req
->in
.args
[0].value
= &inarg
;
705 req
->in
.args
[1].size
= oldent
->d_name
.len
+ 1;
706 req
->in
.args
[1].value
= oldent
->d_name
.name
;
707 req
->in
.args
[2].size
= newent
->d_name
.len
+ 1;
708 req
->in
.args
[2].value
= newent
->d_name
.name
;
709 fuse_request_send(fc
, req
);
710 err
= req
->out
.h
.error
;
711 fuse_put_request(fc
, req
);
714 fuse_invalidate_attr(oldent
->d_inode
);
716 fuse_invalidate_attr(olddir
);
717 if (olddir
!= newdir
)
718 fuse_invalidate_attr(newdir
);
720 /* newent will end up negative */
721 if (newent
->d_inode
) {
722 fuse_invalidate_attr(newent
->d_inode
);
723 fuse_invalidate_entry_cache(newent
);
725 } else if (err
== -EINTR
) {
726 /* If request was interrupted, DEITY only knows if the
727 rename actually took place. If the invalidation
728 fails (e.g. some process has CWD under the renamed
729 directory), then there can be inconsistency between
730 the dcache and the real filesystem. Tough luck. */
731 fuse_invalidate_entry(oldent
);
733 fuse_invalidate_entry(newent
);
739 static int fuse_link(struct dentry
*entry
, struct inode
*newdir
,
740 struct dentry
*newent
)
743 struct fuse_link_in inarg
;
744 struct inode
*inode
= entry
->d_inode
;
745 struct fuse_conn
*fc
= get_fuse_conn(inode
);
746 struct fuse_req
*req
= fuse_get_req(fc
);
750 memset(&inarg
, 0, sizeof(inarg
));
751 inarg
.oldnodeid
= get_node_id(inode
);
752 req
->in
.h
.opcode
= FUSE_LINK
;
754 req
->in
.args
[0].size
= sizeof(inarg
);
755 req
->in
.args
[0].value
= &inarg
;
756 req
->in
.args
[1].size
= newent
->d_name
.len
+ 1;
757 req
->in
.args
[1].value
= newent
->d_name
.name
;
758 err
= create_new_entry(fc
, req
, newdir
, newent
, inode
->i_mode
);
759 /* Contrary to "normal" filesystems it can happen that link
760 makes two "logical" inodes point to the same "physical"
761 inode. We invalidate the attributes of the old one, so it
762 will reflect changes in the backing inode (link count,
765 if (!err
|| err
== -EINTR
)
766 fuse_invalidate_attr(inode
);
770 static void fuse_fillattr(struct inode
*inode
, struct fuse_attr
*attr
,
773 stat
->dev
= inode
->i_sb
->s_dev
;
774 stat
->ino
= attr
->ino
;
775 stat
->mode
= (inode
->i_mode
& S_IFMT
) | (attr
->mode
& 07777);
776 stat
->nlink
= attr
->nlink
;
777 stat
->uid
= attr
->uid
;
778 stat
->gid
= attr
->gid
;
779 stat
->rdev
= inode
->i_rdev
;
780 stat
->atime
.tv_sec
= attr
->atime
;
781 stat
->atime
.tv_nsec
= attr
->atimensec
;
782 stat
->mtime
.tv_sec
= attr
->mtime
;
783 stat
->mtime
.tv_nsec
= attr
->mtimensec
;
784 stat
->ctime
.tv_sec
= attr
->ctime
;
785 stat
->ctime
.tv_nsec
= attr
->ctimensec
;
786 stat
->size
= attr
->size
;
787 stat
->blocks
= attr
->blocks
;
788 stat
->blksize
= (1 << inode
->i_blkbits
);
791 static int fuse_do_getattr(struct inode
*inode
, struct kstat
*stat
,
795 struct fuse_getattr_in inarg
;
796 struct fuse_attr_out outarg
;
797 struct fuse_conn
*fc
= get_fuse_conn(inode
);
798 struct fuse_req
*req
;
801 req
= fuse_get_req(fc
);
805 attr_version
= fuse_get_attr_version(fc
);
807 memset(&inarg
, 0, sizeof(inarg
));
808 memset(&outarg
, 0, sizeof(outarg
));
809 /* Directories have separate file-handle space */
810 if (file
&& S_ISREG(inode
->i_mode
)) {
811 struct fuse_file
*ff
= file
->private_data
;
813 inarg
.getattr_flags
|= FUSE_GETATTR_FH
;
816 req
->in
.h
.opcode
= FUSE_GETATTR
;
817 req
->in
.h
.nodeid
= get_node_id(inode
);
819 req
->in
.args
[0].size
= sizeof(inarg
);
820 req
->in
.args
[0].value
= &inarg
;
821 req
->out
.numargs
= 1;
823 req
->out
.args
[0].size
= FUSE_COMPAT_ATTR_OUT_SIZE
;
825 req
->out
.args
[0].size
= sizeof(outarg
);
826 req
->out
.args
[0].value
= &outarg
;
827 fuse_request_send(fc
, req
);
828 err
= req
->out
.h
.error
;
829 fuse_put_request(fc
, req
);
831 if ((inode
->i_mode
^ outarg
.attr
.mode
) & S_IFMT
) {
832 make_bad_inode(inode
);
835 fuse_change_attributes(inode
, &outarg
.attr
,
836 attr_timeout(&outarg
),
839 fuse_fillattr(inode
, &outarg
.attr
, stat
);
845 int fuse_update_attributes(struct inode
*inode
, struct kstat
*stat
,
846 struct file
*file
, bool *refreshed
)
848 struct fuse_inode
*fi
= get_fuse_inode(inode
);
852 if (fi
->i_time
< get_jiffies_64()) {
854 err
= fuse_do_getattr(inode
, stat
, file
);
859 generic_fillattr(inode
, stat
);
860 stat
->mode
= fi
->orig_i_mode
;
864 if (refreshed
!= NULL
)
870 int fuse_reverse_inval_entry(struct super_block
*sb
, u64 parent_nodeid
,
874 struct inode
*parent
;
876 struct dentry
*entry
;
878 parent
= ilookup5(sb
, parent_nodeid
, fuse_inode_eq
, &parent_nodeid
);
882 mutex_lock(&parent
->i_mutex
);
883 if (!S_ISDIR(parent
->i_mode
))
887 dir
= d_find_alias(parent
);
891 entry
= d_lookup(dir
, name
);
896 fuse_invalidate_attr(parent
);
897 fuse_invalidate_entry(entry
);
902 mutex_unlock(&parent
->i_mutex
);
908 * Calling into a user-controlled filesystem gives the filesystem
909 * daemon ptrace-like capabilities over the requester process. This
910 * means, that the filesystem daemon is able to record the exact
911 * filesystem operations performed, and can also control the behavior
912 * of the requester process in otherwise impossible ways. For example
913 * it can delay the operation for arbitrary length of time allowing
914 * DoS against the requester.
916 * For this reason only those processes can call into the filesystem,
917 * for which the owner of the mount has ptrace privilege. This
918 * excludes processes started by other users, suid or sgid processes.
920 int fuse_allow_task(struct fuse_conn
*fc
, struct task_struct
*task
)
922 const struct cred
*cred
;
925 if (fc
->flags
& FUSE_ALLOW_OTHER
)
930 cred
= __task_cred(task
);
931 if (cred
->euid
== fc
->user_id
&&
932 cred
->suid
== fc
->user_id
&&
933 cred
->uid
== fc
->user_id
&&
934 cred
->egid
== fc
->group_id
&&
935 cred
->sgid
== fc
->group_id
&&
936 cred
->gid
== fc
->group_id
)
943 static int fuse_access(struct inode
*inode
, int mask
)
945 struct fuse_conn
*fc
= get_fuse_conn(inode
);
946 struct fuse_req
*req
;
947 struct fuse_access_in inarg
;
953 req
= fuse_get_req(fc
);
957 memset(&inarg
, 0, sizeof(inarg
));
958 inarg
.mask
= mask
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
);
959 req
->in
.h
.opcode
= FUSE_ACCESS
;
960 req
->in
.h
.nodeid
= get_node_id(inode
);
962 req
->in
.args
[0].size
= sizeof(inarg
);
963 req
->in
.args
[0].value
= &inarg
;
964 fuse_request_send(fc
, req
);
965 err
= req
->out
.h
.error
;
966 fuse_put_request(fc
, req
);
967 if (err
== -ENOSYS
) {
974 static int fuse_perm_getattr(struct inode
*inode
, int mask
)
976 if (mask
& MAY_NOT_BLOCK
)
979 return fuse_do_getattr(inode
, NULL
, NULL
);
983 * Check permission. The two basic access models of FUSE are:
985 * 1) Local access checking ('default_permissions' mount option) based
986 * on file mode. This is the plain old disk filesystem permission
989 * 2) "Remote" access checking, where server is responsible for
990 * checking permission in each inode operation. An exception to this
991 * is if ->permission() was invoked from sys_access() in which case an
992 * access request is sent. Execute permission is still checked
993 * locally based on file mode.
995 static int fuse_permission(struct inode
*inode
, int mask
)
997 struct fuse_conn
*fc
= get_fuse_conn(inode
);
998 bool refreshed
= false;
1001 if (!fuse_allow_task(fc
, current
))
1005 * If attributes are needed, refresh them before proceeding
1007 if ((fc
->flags
& FUSE_DEFAULT_PERMISSIONS
) ||
1008 ((mask
& MAY_EXEC
) && S_ISREG(inode
->i_mode
))) {
1009 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1011 if (fi
->i_time
< get_jiffies_64()) {
1014 err
= fuse_perm_getattr(inode
, mask
);
1020 if (fc
->flags
& FUSE_DEFAULT_PERMISSIONS
) {
1021 err
= generic_permission(inode
, mask
);
1023 /* If permission is denied, try to refresh file
1024 attributes. This is also needed, because the root
1025 node will at first have no permissions */
1026 if (err
== -EACCES
&& !refreshed
) {
1027 err
= fuse_perm_getattr(inode
, mask
);
1029 err
= generic_permission(inode
, mask
);
1032 /* Note: the opposite of the above test does not
1033 exist. So if permissions are revoked this won't be
1034 noticed immediately, only after the attribute
1035 timeout has expired */
1036 } else if (mask
& (MAY_ACCESS
| MAY_CHDIR
)) {
1037 if (mask
& MAY_NOT_BLOCK
)
1040 err
= fuse_access(inode
, mask
);
1041 } else if ((mask
& MAY_EXEC
) && S_ISREG(inode
->i_mode
)) {
1042 if (!(inode
->i_mode
& S_IXUGO
)) {
1046 err
= fuse_perm_getattr(inode
, mask
);
1047 if (!err
&& !(inode
->i_mode
& S_IXUGO
))
1054 static int parse_dirfile(char *buf
, size_t nbytes
, struct file
*file
,
1055 void *dstbuf
, filldir_t filldir
)
1057 while (nbytes
>= FUSE_NAME_OFFSET
) {
1058 struct fuse_dirent
*dirent
= (struct fuse_dirent
*) buf
;
1059 size_t reclen
= FUSE_DIRENT_SIZE(dirent
);
1061 if (!dirent
->namelen
|| dirent
->namelen
> FUSE_NAME_MAX
)
1063 if (reclen
> nbytes
)
1066 over
= filldir(dstbuf
, dirent
->name
, dirent
->namelen
,
1067 file
->f_pos
, dirent
->ino
, dirent
->type
);
1073 file
->f_pos
= dirent
->off
;
1079 static int fuse_readdir(struct file
*file
, void *dstbuf
, filldir_t filldir
)
1084 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1085 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1086 struct fuse_req
*req
;
1088 if (is_bad_inode(inode
))
1091 req
= fuse_get_req(fc
);
1093 return PTR_ERR(req
);
1095 page
= alloc_page(GFP_KERNEL
);
1097 fuse_put_request(fc
, req
);
1100 req
->out
.argpages
= 1;
1102 req
->pages
[0] = page
;
1103 fuse_read_fill(req
, file
, file
->f_pos
, PAGE_SIZE
, FUSE_READDIR
);
1104 fuse_request_send(fc
, req
);
1105 nbytes
= req
->out
.args
[0].size
;
1106 err
= req
->out
.h
.error
;
1107 fuse_put_request(fc
, req
);
1109 err
= parse_dirfile(page_address(page
), nbytes
, file
, dstbuf
,
1113 fuse_invalidate_attr(inode
); /* atime changed */
1117 static char *read_link(struct dentry
*dentry
)
1119 struct inode
*inode
= dentry
->d_inode
;
1120 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1121 struct fuse_req
*req
= fuse_get_req(fc
);
1125 return ERR_CAST(req
);
1127 link
= (char *) __get_free_page(GFP_KERNEL
);
1129 link
= ERR_PTR(-ENOMEM
);
1132 req
->in
.h
.opcode
= FUSE_READLINK
;
1133 req
->in
.h
.nodeid
= get_node_id(inode
);
1134 req
->out
.argvar
= 1;
1135 req
->out
.numargs
= 1;
1136 req
->out
.args
[0].size
= PAGE_SIZE
- 1;
1137 req
->out
.args
[0].value
= link
;
1138 fuse_request_send(fc
, req
);
1139 if (req
->out
.h
.error
) {
1140 free_page((unsigned long) link
);
1141 link
= ERR_PTR(req
->out
.h
.error
);
1143 link
[req
->out
.args
[0].size
] = '\0';
1145 fuse_put_request(fc
, req
);
1146 fuse_invalidate_attr(inode
); /* atime changed */
1150 static void free_link(char *link
)
1153 free_page((unsigned long) link
);
1156 static void *fuse_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1158 nd_set_link(nd
, read_link(dentry
));
1162 static void fuse_put_link(struct dentry
*dentry
, struct nameidata
*nd
, void *c
)
1164 free_link(nd_get_link(nd
));
1167 static int fuse_dir_open(struct inode
*inode
, struct file
*file
)
1169 return fuse_open_common(inode
, file
, true);
1172 static int fuse_dir_release(struct inode
*inode
, struct file
*file
)
1174 fuse_release_common(file
, FUSE_RELEASEDIR
);
1179 static int fuse_dir_fsync(struct file
*file
, loff_t start
, loff_t end
,
1182 return fuse_fsync_common(file
, start
, end
, datasync
, 1);
1185 static bool update_mtime(unsigned ivalid
)
1187 /* Always update if mtime is explicitly set */
1188 if (ivalid
& ATTR_MTIME_SET
)
1191 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1192 if ((ivalid
& ATTR_SIZE
) && (ivalid
& (ATTR_OPEN
| ATTR_FILE
)))
1195 /* In all other cases update */
1199 static void iattr_to_fattr(struct iattr
*iattr
, struct fuse_setattr_in
*arg
)
1201 unsigned ivalid
= iattr
->ia_valid
;
1203 if (ivalid
& ATTR_MODE
)
1204 arg
->valid
|= FATTR_MODE
, arg
->mode
= iattr
->ia_mode
;
1205 if (ivalid
& ATTR_UID
)
1206 arg
->valid
|= FATTR_UID
, arg
->uid
= iattr
->ia_uid
;
1207 if (ivalid
& ATTR_GID
)
1208 arg
->valid
|= FATTR_GID
, arg
->gid
= iattr
->ia_gid
;
1209 if (ivalid
& ATTR_SIZE
)
1210 arg
->valid
|= FATTR_SIZE
, arg
->size
= iattr
->ia_size
;
1211 if (ivalid
& ATTR_ATIME
) {
1212 arg
->valid
|= FATTR_ATIME
;
1213 arg
->atime
= iattr
->ia_atime
.tv_sec
;
1214 arg
->atimensec
= iattr
->ia_atime
.tv_nsec
;
1215 if (!(ivalid
& ATTR_ATIME_SET
))
1216 arg
->valid
|= FATTR_ATIME_NOW
;
1218 if ((ivalid
& ATTR_MTIME
) && update_mtime(ivalid
)) {
1219 arg
->valid
|= FATTR_MTIME
;
1220 arg
->mtime
= iattr
->ia_mtime
.tv_sec
;
1221 arg
->mtimensec
= iattr
->ia_mtime
.tv_nsec
;
1222 if (!(ivalid
& ATTR_MTIME_SET
))
1223 arg
->valid
|= FATTR_MTIME_NOW
;
1228 * Prevent concurrent writepages on inode
1230 * This is done by adding a negative bias to the inode write counter
1231 * and waiting for all pending writes to finish.
1233 void fuse_set_nowrite(struct inode
*inode
)
1235 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1236 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1238 BUG_ON(!mutex_is_locked(&inode
->i_mutex
));
1240 spin_lock(&fc
->lock
);
1241 BUG_ON(fi
->writectr
< 0);
1242 fi
->writectr
+= FUSE_NOWRITE
;
1243 spin_unlock(&fc
->lock
);
1244 wait_event(fi
->page_waitq
, fi
->writectr
== FUSE_NOWRITE
);
1248 * Allow writepages on inode
1250 * Remove the bias from the writecounter and send any queued
1253 static void __fuse_release_nowrite(struct inode
*inode
)
1255 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1257 BUG_ON(fi
->writectr
!= FUSE_NOWRITE
);
1259 fuse_flush_writepages(inode
);
1262 void fuse_release_nowrite(struct inode
*inode
)
1264 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1266 spin_lock(&fc
->lock
);
1267 __fuse_release_nowrite(inode
);
1268 spin_unlock(&fc
->lock
);
1272 * Set attributes, and at the same time refresh them.
1274 * Truncation is slightly complicated, because the 'truncate' request
1275 * may fail, in which case we don't want to touch the mapping.
1276 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1277 * and the actual truncation by hand.
1279 static int fuse_do_setattr(struct dentry
*entry
, struct iattr
*attr
,
1282 struct inode
*inode
= entry
->d_inode
;
1283 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1284 struct fuse_req
*req
;
1285 struct fuse_setattr_in inarg
;
1286 struct fuse_attr_out outarg
;
1287 bool is_truncate
= false;
1291 if (!fuse_allow_task(fc
, current
))
1294 if (!(fc
->flags
& FUSE_DEFAULT_PERMISSIONS
))
1295 attr
->ia_valid
|= ATTR_FORCE
;
1297 err
= inode_change_ok(inode
, attr
);
1301 if (attr
->ia_valid
& ATTR_OPEN
) {
1302 if (fc
->atomic_o_trunc
)
1307 if (attr
->ia_valid
& ATTR_SIZE
)
1310 req
= fuse_get_req(fc
);
1312 return PTR_ERR(req
);
1315 fuse_set_nowrite(inode
);
1317 memset(&inarg
, 0, sizeof(inarg
));
1318 memset(&outarg
, 0, sizeof(outarg
));
1319 iattr_to_fattr(attr
, &inarg
);
1321 struct fuse_file
*ff
= file
->private_data
;
1322 inarg
.valid
|= FATTR_FH
;
1325 if (attr
->ia_valid
& ATTR_SIZE
) {
1326 /* For mandatory locking in truncate */
1327 inarg
.valid
|= FATTR_LOCKOWNER
;
1328 inarg
.lock_owner
= fuse_lock_owner_id(fc
, current
->files
);
1330 req
->in
.h
.opcode
= FUSE_SETATTR
;
1331 req
->in
.h
.nodeid
= get_node_id(inode
);
1332 req
->in
.numargs
= 1;
1333 req
->in
.args
[0].size
= sizeof(inarg
);
1334 req
->in
.args
[0].value
= &inarg
;
1335 req
->out
.numargs
= 1;
1337 req
->out
.args
[0].size
= FUSE_COMPAT_ATTR_OUT_SIZE
;
1339 req
->out
.args
[0].size
= sizeof(outarg
);
1340 req
->out
.args
[0].value
= &outarg
;
1341 fuse_request_send(fc
, req
);
1342 err
= req
->out
.h
.error
;
1343 fuse_put_request(fc
, req
);
1346 fuse_invalidate_attr(inode
);
1350 if ((inode
->i_mode
^ outarg
.attr
.mode
) & S_IFMT
) {
1351 make_bad_inode(inode
);
1356 spin_lock(&fc
->lock
);
1357 fuse_change_attributes_common(inode
, &outarg
.attr
,
1358 attr_timeout(&outarg
));
1359 oldsize
= inode
->i_size
;
1360 i_size_write(inode
, outarg
.attr
.size
);
1363 /* NOTE: this may release/reacquire fc->lock */
1364 __fuse_release_nowrite(inode
);
1366 spin_unlock(&fc
->lock
);
1369 * Only call invalidate_inode_pages2() after removing
1370 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1372 if (S_ISREG(inode
->i_mode
) && oldsize
!= outarg
.attr
.size
) {
1373 truncate_pagecache(inode
, oldsize
, outarg
.attr
.size
);
1374 invalidate_inode_pages2(inode
->i_mapping
);
1381 fuse_release_nowrite(inode
);
1386 static int fuse_setattr(struct dentry
*entry
, struct iattr
*attr
)
1388 if (attr
->ia_valid
& ATTR_FILE
)
1389 return fuse_do_setattr(entry
, attr
, attr
->ia_file
);
1391 return fuse_do_setattr(entry
, attr
, NULL
);
1394 static int fuse_getattr(struct vfsmount
*mnt
, struct dentry
*entry
,
1397 struct inode
*inode
= entry
->d_inode
;
1398 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1400 if (!fuse_allow_task(fc
, current
))
1403 return fuse_update_attributes(inode
, stat
, NULL
, NULL
);
1406 static int fuse_setxattr(struct dentry
*entry
, const char *name
,
1407 const void *value
, size_t size
, int flags
)
1409 struct inode
*inode
= entry
->d_inode
;
1410 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1411 struct fuse_req
*req
;
1412 struct fuse_setxattr_in inarg
;
1415 if (fc
->no_setxattr
)
1418 req
= fuse_get_req(fc
);
1420 return PTR_ERR(req
);
1422 memset(&inarg
, 0, sizeof(inarg
));
1424 inarg
.flags
= flags
;
1425 req
->in
.h
.opcode
= FUSE_SETXATTR
;
1426 req
->in
.h
.nodeid
= get_node_id(inode
);
1427 req
->in
.numargs
= 3;
1428 req
->in
.args
[0].size
= sizeof(inarg
);
1429 req
->in
.args
[0].value
= &inarg
;
1430 req
->in
.args
[1].size
= strlen(name
) + 1;
1431 req
->in
.args
[1].value
= name
;
1432 req
->in
.args
[2].size
= size
;
1433 req
->in
.args
[2].value
= value
;
1434 fuse_request_send(fc
, req
);
1435 err
= req
->out
.h
.error
;
1436 fuse_put_request(fc
, req
);
1437 if (err
== -ENOSYS
) {
1438 fc
->no_setxattr
= 1;
1444 static ssize_t
fuse_getxattr(struct dentry
*entry
, const char *name
,
1445 void *value
, size_t size
)
1447 struct inode
*inode
= entry
->d_inode
;
1448 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1449 struct fuse_req
*req
;
1450 struct fuse_getxattr_in inarg
;
1451 struct fuse_getxattr_out outarg
;
1454 if (fc
->no_getxattr
)
1457 req
= fuse_get_req(fc
);
1459 return PTR_ERR(req
);
1461 memset(&inarg
, 0, sizeof(inarg
));
1463 req
->in
.h
.opcode
= FUSE_GETXATTR
;
1464 req
->in
.h
.nodeid
= get_node_id(inode
);
1465 req
->in
.numargs
= 2;
1466 req
->in
.args
[0].size
= sizeof(inarg
);
1467 req
->in
.args
[0].value
= &inarg
;
1468 req
->in
.args
[1].size
= strlen(name
) + 1;
1469 req
->in
.args
[1].value
= name
;
1470 /* This is really two different operations rolled into one */
1471 req
->out
.numargs
= 1;
1473 req
->out
.argvar
= 1;
1474 req
->out
.args
[0].size
= size
;
1475 req
->out
.args
[0].value
= value
;
1477 req
->out
.args
[0].size
= sizeof(outarg
);
1478 req
->out
.args
[0].value
= &outarg
;
1480 fuse_request_send(fc
, req
);
1481 ret
= req
->out
.h
.error
;
1483 ret
= size
? req
->out
.args
[0].size
: outarg
.size
;
1485 if (ret
== -ENOSYS
) {
1486 fc
->no_getxattr
= 1;
1490 fuse_put_request(fc
, req
);
1494 static ssize_t
fuse_listxattr(struct dentry
*entry
, char *list
, size_t size
)
1496 struct inode
*inode
= entry
->d_inode
;
1497 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1498 struct fuse_req
*req
;
1499 struct fuse_getxattr_in inarg
;
1500 struct fuse_getxattr_out outarg
;
1503 if (!fuse_allow_task(fc
, current
))
1506 if (fc
->no_listxattr
)
1509 req
= fuse_get_req(fc
);
1511 return PTR_ERR(req
);
1513 memset(&inarg
, 0, sizeof(inarg
));
1515 req
->in
.h
.opcode
= FUSE_LISTXATTR
;
1516 req
->in
.h
.nodeid
= get_node_id(inode
);
1517 req
->in
.numargs
= 1;
1518 req
->in
.args
[0].size
= sizeof(inarg
);
1519 req
->in
.args
[0].value
= &inarg
;
1520 /* This is really two different operations rolled into one */
1521 req
->out
.numargs
= 1;
1523 req
->out
.argvar
= 1;
1524 req
->out
.args
[0].size
= size
;
1525 req
->out
.args
[0].value
= list
;
1527 req
->out
.args
[0].size
= sizeof(outarg
);
1528 req
->out
.args
[0].value
= &outarg
;
1530 fuse_request_send(fc
, req
);
1531 ret
= req
->out
.h
.error
;
1533 ret
= size
? req
->out
.args
[0].size
: outarg
.size
;
1535 if (ret
== -ENOSYS
) {
1536 fc
->no_listxattr
= 1;
1540 fuse_put_request(fc
, req
);
1544 static int fuse_removexattr(struct dentry
*entry
, const char *name
)
1546 struct inode
*inode
= entry
->d_inode
;
1547 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1548 struct fuse_req
*req
;
1551 if (fc
->no_removexattr
)
1554 req
= fuse_get_req(fc
);
1556 return PTR_ERR(req
);
1558 req
->in
.h
.opcode
= FUSE_REMOVEXATTR
;
1559 req
->in
.h
.nodeid
= get_node_id(inode
);
1560 req
->in
.numargs
= 1;
1561 req
->in
.args
[0].size
= strlen(name
) + 1;
1562 req
->in
.args
[0].value
= name
;
1563 fuse_request_send(fc
, req
);
1564 err
= req
->out
.h
.error
;
1565 fuse_put_request(fc
, req
);
1566 if (err
== -ENOSYS
) {
1567 fc
->no_removexattr
= 1;
1573 static const struct inode_operations fuse_dir_inode_operations
= {
1574 .lookup
= fuse_lookup
,
1575 .mkdir
= fuse_mkdir
,
1576 .symlink
= fuse_symlink
,
1577 .unlink
= fuse_unlink
,
1578 .rmdir
= fuse_rmdir
,
1579 .rename
= fuse_rename
,
1581 .setattr
= fuse_setattr
,
1582 .create
= fuse_create
,
1583 .mknod
= fuse_mknod
,
1584 .permission
= fuse_permission
,
1585 .getattr
= fuse_getattr
,
1586 .setxattr
= fuse_setxattr
,
1587 .getxattr
= fuse_getxattr
,
1588 .listxattr
= fuse_listxattr
,
1589 .removexattr
= fuse_removexattr
,
1592 static const struct file_operations fuse_dir_operations
= {
1593 .llseek
= generic_file_llseek
,
1594 .read
= generic_read_dir
,
1595 .readdir
= fuse_readdir
,
1596 .open
= fuse_dir_open
,
1597 .release
= fuse_dir_release
,
1598 .fsync
= fuse_dir_fsync
,
1601 static const struct inode_operations fuse_common_inode_operations
= {
1602 .setattr
= fuse_setattr
,
1603 .permission
= fuse_permission
,
1604 .getattr
= fuse_getattr
,
1605 .setxattr
= fuse_setxattr
,
1606 .getxattr
= fuse_getxattr
,
1607 .listxattr
= fuse_listxattr
,
1608 .removexattr
= fuse_removexattr
,
1611 static const struct inode_operations fuse_symlink_inode_operations
= {
1612 .setattr
= fuse_setattr
,
1613 .follow_link
= fuse_follow_link
,
1614 .put_link
= fuse_put_link
,
1615 .readlink
= generic_readlink
,
1616 .getattr
= fuse_getattr
,
1617 .setxattr
= fuse_setxattr
,
1618 .getxattr
= fuse_getxattr
,
1619 .listxattr
= fuse_listxattr
,
1620 .removexattr
= fuse_removexattr
,
1623 void fuse_init_common(struct inode
*inode
)
1625 inode
->i_op
= &fuse_common_inode_operations
;
1628 void fuse_init_dir(struct inode
*inode
)
1630 inode
->i_op
= &fuse_dir_inode_operations
;
1631 inode
->i_fop
= &fuse_dir_operations
;
1634 void fuse_init_symlink(struct inode
*inode
)
1636 inode
->i_op
= &fuse_symlink_inode_operations
;