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 static bool fuse_use_readdirplus(struct inode
*dir
, struct dir_context
*ctx
)
19 struct fuse_conn
*fc
= get_fuse_conn(dir
);
20 struct fuse_inode
*fi
= get_fuse_inode(dir
);
22 if (!fc
->do_readdirplus
)
24 if (!fc
->readdirplus_auto
)
26 if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS
, &fi
->state
))
33 static void fuse_advise_use_readdirplus(struct inode
*dir
)
35 struct fuse_inode
*fi
= get_fuse_inode(dir
);
37 set_bit(FUSE_I_ADVISE_RDPLUS
, &fi
->state
);
40 #if BITS_PER_LONG >= 64
41 static inline void fuse_dentry_settime(struct dentry
*entry
, u64 time
)
46 static inline u64
fuse_dentry_time(struct dentry
*entry
)
52 * On 32 bit archs store the high 32 bits of time in d_fsdata
54 static void fuse_dentry_settime(struct dentry
*entry
, u64 time
)
57 entry
->d_fsdata
= (void *) (unsigned long) (time
>> 32);
60 static u64
fuse_dentry_time(struct dentry
*entry
)
62 return (u64
) entry
->d_time
+
63 ((u64
) (unsigned long) entry
->d_fsdata
<< 32);
68 * FUSE caches dentries and attributes with separate timeout. The
69 * time in jiffies until the dentry/attributes are valid is stored in
70 * dentry->d_time and fuse_inode->i_time respectively.
74 * Calculate the time in jiffies until a dentry/attributes are valid
76 static u64
time_to_jiffies(unsigned long sec
, unsigned long nsec
)
79 struct timespec ts
= {sec
, nsec
};
80 return get_jiffies_64() + timespec_to_jiffies(&ts
);
86 * Set dentry and possibly attribute timeouts from the lookup/mk*
89 static void fuse_change_entry_timeout(struct dentry
*entry
,
90 struct fuse_entry_out
*o
)
92 fuse_dentry_settime(entry
,
93 time_to_jiffies(o
->entry_valid
, o
->entry_valid_nsec
));
96 static u64
attr_timeout(struct fuse_attr_out
*o
)
98 return time_to_jiffies(o
->attr_valid
, o
->attr_valid_nsec
);
101 static u64
entry_attr_timeout(struct fuse_entry_out
*o
)
103 return time_to_jiffies(o
->attr_valid
, o
->attr_valid_nsec
);
107 * Mark the attributes as stale, so that at the next call to
108 * ->getattr() they will be fetched from userspace
110 void fuse_invalidate_attr(struct inode
*inode
)
112 get_fuse_inode(inode
)->i_time
= 0;
116 * Mark the attributes as stale due to an atime change. Avoid the invalidate if
119 void fuse_invalidate_atime(struct inode
*inode
)
121 if (!IS_RDONLY(inode
))
122 fuse_invalidate_attr(inode
);
126 * Just mark the entry as stale, so that a next attempt to look it up
127 * will result in a new lookup call to userspace
129 * This is called when a dentry is about to become negative and the
130 * timeout is unknown (unlink, rmdir, rename and in some cases
133 void fuse_invalidate_entry_cache(struct dentry
*entry
)
135 fuse_dentry_settime(entry
, 0);
139 * Same as fuse_invalidate_entry_cache(), but also try to remove the
140 * dentry from the hash
142 static void fuse_invalidate_entry(struct dentry
*entry
)
145 fuse_invalidate_entry_cache(entry
);
148 static void fuse_lookup_init(struct fuse_conn
*fc
, struct fuse_args
*args
,
149 u64 nodeid
, struct qstr
*name
,
150 struct fuse_entry_out
*outarg
)
152 memset(outarg
, 0, sizeof(struct fuse_entry_out
));
153 args
->in
.h
.opcode
= FUSE_LOOKUP
;
154 args
->in
.h
.nodeid
= nodeid
;
155 args
->in
.numargs
= 1;
156 args
->in
.args
[0].size
= name
->len
+ 1;
157 args
->in
.args
[0].value
= name
->name
;
158 args
->out
.numargs
= 1;
159 args
->out
.args
[0].size
= sizeof(struct fuse_entry_out
);
160 args
->out
.args
[0].value
= outarg
;
163 u64
fuse_get_attr_version(struct fuse_conn
*fc
)
168 * The spin lock isn't actually needed on 64bit archs, but we
169 * don't yet care too much about such optimizations.
171 spin_lock(&fc
->lock
);
172 curr_version
= fc
->attr_version
;
173 spin_unlock(&fc
->lock
);
179 * Check whether the dentry is still valid
181 * If the entry validity timeout has expired and the dentry is
182 * positive, try to redo the lookup. If the lookup results in a
183 * different inode, then let the VFS invalidate the dentry and redo
184 * the lookup once more. If the lookup results in the same inode,
185 * then refresh the attributes, timeouts and mark the dentry valid.
187 static int fuse_dentry_revalidate(struct dentry
*entry
, unsigned int flags
)
190 struct dentry
*parent
;
191 struct fuse_conn
*fc
;
192 struct fuse_inode
*fi
;
195 inode
= d_inode_rcu(entry
);
196 if (inode
&& is_bad_inode(inode
))
198 else if (time_before64(fuse_dentry_time(entry
), get_jiffies_64()) ||
199 (flags
& LOOKUP_REVAL
)) {
200 struct fuse_entry_out outarg
;
202 struct fuse_forget_link
*forget
;
205 /* For negative dentries, always do a fresh lookup */
210 if (flags
& LOOKUP_RCU
)
213 fc
= get_fuse_conn(inode
);
215 forget
= fuse_alloc_forget();
220 attr_version
= fuse_get_attr_version(fc
);
222 parent
= dget_parent(entry
);
223 fuse_lookup_init(fc
, &args
, get_node_id(d_inode(parent
)),
224 &entry
->d_name
, &outarg
);
225 ret
= fuse_simple_request(fc
, &args
);
227 /* Zero nodeid is same as -ENOENT */
228 if (!ret
&& !outarg
.nodeid
)
231 fi
= get_fuse_inode(inode
);
232 if (outarg
.nodeid
!= get_node_id(inode
)) {
233 fuse_queue_forget(fc
, forget
, outarg
.nodeid
, 1);
236 spin_lock(&fc
->lock
);
238 spin_unlock(&fc
->lock
);
243 if (ret
|| (outarg
.attr
.mode
^ inode
->i_mode
) & S_IFMT
)
246 fuse_change_attributes(inode
, &outarg
.attr
,
247 entry_attr_timeout(&outarg
),
249 fuse_change_entry_timeout(entry
, &outarg
);
251 fi
= get_fuse_inode(inode
);
252 if (flags
& LOOKUP_RCU
) {
253 if (test_bit(FUSE_I_INIT_RDPLUS
, &fi
->state
))
255 } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS
, &fi
->state
)) {
256 parent
= dget_parent(entry
);
257 fuse_advise_use_readdirplus(d_inode(parent
));
270 static int invalid_nodeid(u64 nodeid
)
272 return !nodeid
|| nodeid
== FUSE_ROOT_ID
;
275 const struct dentry_operations fuse_dentry_operations
= {
276 .d_revalidate
= fuse_dentry_revalidate
,
279 int fuse_valid_type(int m
)
281 return S_ISREG(m
) || S_ISDIR(m
) || S_ISLNK(m
) || S_ISCHR(m
) ||
282 S_ISBLK(m
) || S_ISFIFO(m
) || S_ISSOCK(m
);
285 int fuse_lookup_name(struct super_block
*sb
, u64 nodeid
, struct qstr
*name
,
286 struct fuse_entry_out
*outarg
, struct inode
**inode
)
288 struct fuse_conn
*fc
= get_fuse_conn_super(sb
);
290 struct fuse_forget_link
*forget
;
296 if (name
->len
> FUSE_NAME_MAX
)
300 forget
= fuse_alloc_forget();
305 attr_version
= fuse_get_attr_version(fc
);
307 fuse_lookup_init(fc
, &args
, nodeid
, name
, outarg
);
308 err
= fuse_simple_request(fc
, &args
);
309 /* Zero nodeid is same as -ENOENT, but with valid timeout */
310 if (err
|| !outarg
->nodeid
)
316 if (!fuse_valid_type(outarg
->attr
.mode
))
319 *inode
= fuse_iget(sb
, outarg
->nodeid
, outarg
->generation
,
320 &outarg
->attr
, entry_attr_timeout(outarg
),
324 fuse_queue_forget(fc
, forget
, outarg
->nodeid
, 1);
335 static struct dentry
*fuse_lookup(struct inode
*dir
, struct dentry
*entry
,
339 struct fuse_entry_out outarg
;
341 struct dentry
*newent
;
342 bool outarg_valid
= true;
344 err
= fuse_lookup_name(dir
->i_sb
, get_node_id(dir
), &entry
->d_name
,
346 if (err
== -ENOENT
) {
347 outarg_valid
= false;
354 if (inode
&& get_node_id(inode
) == FUSE_ROOT_ID
)
357 newent
= d_splice_alias(inode
, entry
);
358 err
= PTR_ERR(newent
);
362 entry
= newent
? newent
: entry
;
364 fuse_change_entry_timeout(entry
, &outarg
);
366 fuse_invalidate_entry_cache(entry
);
368 fuse_advise_use_readdirplus(dir
);
378 * Atomic create+open operation
380 * If the filesystem doesn't support this, then fall back to separate
381 * 'mknod' + 'open' requests.
383 static int fuse_create_open(struct inode
*dir
, struct dentry
*entry
,
384 struct file
*file
, unsigned flags
,
385 umode_t mode
, int *opened
)
389 struct fuse_conn
*fc
= get_fuse_conn(dir
);
391 struct fuse_forget_link
*forget
;
392 struct fuse_create_in inarg
;
393 struct fuse_open_out outopen
;
394 struct fuse_entry_out outentry
;
395 struct fuse_file
*ff
;
397 /* Userspace expects S_IFREG in create mode */
398 BUG_ON((mode
& S_IFMT
) != S_IFREG
);
400 forget
= fuse_alloc_forget();
406 ff
= fuse_file_alloc(fc
);
408 goto out_put_forget_req
;
411 mode
&= ~current_umask();
414 memset(&inarg
, 0, sizeof(inarg
));
415 memset(&outentry
, 0, sizeof(outentry
));
418 inarg
.umask
= current_umask();
419 args
.in
.h
.opcode
= FUSE_CREATE
;
420 args
.in
.h
.nodeid
= get_node_id(dir
);
422 args
.in
.args
[0].size
= sizeof(inarg
);
423 args
.in
.args
[0].value
= &inarg
;
424 args
.in
.args
[1].size
= entry
->d_name
.len
+ 1;
425 args
.in
.args
[1].value
= entry
->d_name
.name
;
426 args
.out
.numargs
= 2;
427 args
.out
.args
[0].size
= sizeof(outentry
);
428 args
.out
.args
[0].value
= &outentry
;
429 args
.out
.args
[1].size
= sizeof(outopen
);
430 args
.out
.args
[1].value
= &outopen
;
431 err
= fuse_simple_request(fc
, &args
);
436 if (!S_ISREG(outentry
.attr
.mode
) || invalid_nodeid(outentry
.nodeid
))
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
);
472 static int fuse_mknod(struct inode
*, struct dentry
*, umode_t
, dev_t
);
473 static int fuse_atomic_open(struct inode
*dir
, struct dentry
*entry
,
474 struct file
*file
, unsigned flags
,
475 umode_t mode
, int *opened
)
478 struct fuse_conn
*fc
= get_fuse_conn(dir
);
479 struct dentry
*res
= NULL
;
481 if (d_unhashed(entry
)) {
482 res
= fuse_lookup(dir
, entry
, 0);
490 if (!(flags
& O_CREAT
) || d_really_is_positive(entry
))
494 *opened
|= FILE_CREATED
;
499 err
= fuse_create_open(dir
, entry
, file
, flags
, mode
, opened
);
500 if (err
== -ENOSYS
) {
509 err
= fuse_mknod(dir
, entry
, mode
, 0);
513 return finish_no_open(file
, res
);
517 * Code shared between mknod, mkdir, symlink and link
519 static int create_new_entry(struct fuse_conn
*fc
, struct fuse_args
*args
,
520 struct inode
*dir
, struct dentry
*entry
,
523 struct fuse_entry_out outarg
;
526 struct fuse_forget_link
*forget
;
528 forget
= fuse_alloc_forget();
532 memset(&outarg
, 0, sizeof(outarg
));
533 args
->in
.h
.nodeid
= get_node_id(dir
);
534 args
->out
.numargs
= 1;
535 args
->out
.args
[0].size
= sizeof(outarg
);
536 args
->out
.args
[0].value
= &outarg
;
537 err
= fuse_simple_request(fc
, args
);
539 goto out_put_forget_req
;
542 if (invalid_nodeid(outarg
.nodeid
))
543 goto out_put_forget_req
;
545 if ((outarg
.attr
.mode
^ mode
) & S_IFMT
)
546 goto out_put_forget_req
;
548 inode
= fuse_iget(dir
->i_sb
, outarg
.nodeid
, outarg
.generation
,
549 &outarg
.attr
, entry_attr_timeout(&outarg
), 0);
551 fuse_queue_forget(fc
, forget
, outarg
.nodeid
, 1);
556 err
= d_instantiate_no_diralias(entry
, inode
);
560 fuse_change_entry_timeout(entry
, &outarg
);
561 fuse_invalidate_attr(dir
);
569 static int fuse_mknod(struct inode
*dir
, struct dentry
*entry
, umode_t mode
,
572 struct fuse_mknod_in inarg
;
573 struct fuse_conn
*fc
= get_fuse_conn(dir
);
577 mode
&= ~current_umask();
579 memset(&inarg
, 0, sizeof(inarg
));
581 inarg
.rdev
= new_encode_dev(rdev
);
582 inarg
.umask
= current_umask();
583 args
.in
.h
.opcode
= FUSE_MKNOD
;
585 args
.in
.args
[0].size
= sizeof(inarg
);
586 args
.in
.args
[0].value
= &inarg
;
587 args
.in
.args
[1].size
= entry
->d_name
.len
+ 1;
588 args
.in
.args
[1].value
= entry
->d_name
.name
;
589 return create_new_entry(fc
, &args
, dir
, entry
, mode
);
592 static int fuse_create(struct inode
*dir
, struct dentry
*entry
, umode_t mode
,
595 return fuse_mknod(dir
, entry
, mode
, 0);
598 static int fuse_mkdir(struct inode
*dir
, struct dentry
*entry
, umode_t mode
)
600 struct fuse_mkdir_in inarg
;
601 struct fuse_conn
*fc
= get_fuse_conn(dir
);
605 mode
&= ~current_umask();
607 memset(&inarg
, 0, sizeof(inarg
));
609 inarg
.umask
= current_umask();
610 args
.in
.h
.opcode
= FUSE_MKDIR
;
612 args
.in
.args
[0].size
= sizeof(inarg
);
613 args
.in
.args
[0].value
= &inarg
;
614 args
.in
.args
[1].size
= entry
->d_name
.len
+ 1;
615 args
.in
.args
[1].value
= entry
->d_name
.name
;
616 return create_new_entry(fc
, &args
, dir
, entry
, S_IFDIR
);
619 static int fuse_symlink(struct inode
*dir
, struct dentry
*entry
,
622 struct fuse_conn
*fc
= get_fuse_conn(dir
);
623 unsigned len
= strlen(link
) + 1;
626 args
.in
.h
.opcode
= FUSE_SYMLINK
;
628 args
.in
.args
[0].size
= entry
->d_name
.len
+ 1;
629 args
.in
.args
[0].value
= entry
->d_name
.name
;
630 args
.in
.args
[1].size
= len
;
631 args
.in
.args
[1].value
= link
;
632 return create_new_entry(fc
, &args
, dir
, entry
, S_IFLNK
);
635 static inline void fuse_update_ctime(struct inode
*inode
)
637 if (!IS_NOCMTIME(inode
)) {
638 inode
->i_ctime
= current_fs_time(inode
->i_sb
);
639 mark_inode_dirty_sync(inode
);
643 static int fuse_unlink(struct inode
*dir
, struct dentry
*entry
)
646 struct fuse_conn
*fc
= get_fuse_conn(dir
);
649 args
.in
.h
.opcode
= FUSE_UNLINK
;
650 args
.in
.h
.nodeid
= get_node_id(dir
);
652 args
.in
.args
[0].size
= entry
->d_name
.len
+ 1;
653 args
.in
.args
[0].value
= entry
->d_name
.name
;
654 err
= fuse_simple_request(fc
, &args
);
656 struct inode
*inode
= d_inode(entry
);
657 struct fuse_inode
*fi
= get_fuse_inode(inode
);
659 spin_lock(&fc
->lock
);
660 fi
->attr_version
= ++fc
->attr_version
;
662 * If i_nlink == 0 then unlink doesn't make sense, yet this can
663 * happen if userspace filesystem is careless. It would be
664 * difficult to enforce correct nlink usage so just ignore this
667 if (inode
->i_nlink
> 0)
669 spin_unlock(&fc
->lock
);
670 fuse_invalidate_attr(inode
);
671 fuse_invalidate_attr(dir
);
672 fuse_invalidate_entry_cache(entry
);
673 fuse_update_ctime(inode
);
674 } else if (err
== -EINTR
)
675 fuse_invalidate_entry(entry
);
679 static int fuse_rmdir(struct inode
*dir
, struct dentry
*entry
)
682 struct fuse_conn
*fc
= get_fuse_conn(dir
);
685 args
.in
.h
.opcode
= FUSE_RMDIR
;
686 args
.in
.h
.nodeid
= get_node_id(dir
);
688 args
.in
.args
[0].size
= entry
->d_name
.len
+ 1;
689 args
.in
.args
[0].value
= entry
->d_name
.name
;
690 err
= fuse_simple_request(fc
, &args
);
692 clear_nlink(d_inode(entry
));
693 fuse_invalidate_attr(dir
);
694 fuse_invalidate_entry_cache(entry
);
695 } else if (err
== -EINTR
)
696 fuse_invalidate_entry(entry
);
700 static int fuse_rename_common(struct inode
*olddir
, struct dentry
*oldent
,
701 struct inode
*newdir
, struct dentry
*newent
,
702 unsigned int flags
, int opcode
, size_t argsize
)
705 struct fuse_rename2_in inarg
;
706 struct fuse_conn
*fc
= get_fuse_conn(olddir
);
709 memset(&inarg
, 0, argsize
);
710 inarg
.newdir
= get_node_id(newdir
);
712 args
.in
.h
.opcode
= opcode
;
713 args
.in
.h
.nodeid
= get_node_id(olddir
);
715 args
.in
.args
[0].size
= argsize
;
716 args
.in
.args
[0].value
= &inarg
;
717 args
.in
.args
[1].size
= oldent
->d_name
.len
+ 1;
718 args
.in
.args
[1].value
= oldent
->d_name
.name
;
719 args
.in
.args
[2].size
= newent
->d_name
.len
+ 1;
720 args
.in
.args
[2].value
= newent
->d_name
.name
;
721 err
= fuse_simple_request(fc
, &args
);
724 fuse_invalidate_attr(d_inode(oldent
));
725 fuse_update_ctime(d_inode(oldent
));
727 if (flags
& RENAME_EXCHANGE
) {
728 fuse_invalidate_attr(d_inode(newent
));
729 fuse_update_ctime(d_inode(newent
));
732 fuse_invalidate_attr(olddir
);
733 if (olddir
!= newdir
)
734 fuse_invalidate_attr(newdir
);
736 /* newent will end up negative */
737 if (!(flags
& RENAME_EXCHANGE
) && d_really_is_positive(newent
)) {
738 fuse_invalidate_attr(d_inode(newent
));
739 fuse_invalidate_entry_cache(newent
);
740 fuse_update_ctime(d_inode(newent
));
742 } else if (err
== -EINTR
) {
743 /* If request was interrupted, DEITY only knows if the
744 rename actually took place. If the invalidation
745 fails (e.g. some process has CWD under the renamed
746 directory), then there can be inconsistency between
747 the dcache and the real filesystem. Tough luck. */
748 fuse_invalidate_entry(oldent
);
749 if (d_really_is_positive(newent
))
750 fuse_invalidate_entry(newent
);
756 static int fuse_rename2(struct inode
*olddir
, struct dentry
*oldent
,
757 struct inode
*newdir
, struct dentry
*newent
,
760 struct fuse_conn
*fc
= get_fuse_conn(olddir
);
763 if (flags
& ~(RENAME_NOREPLACE
| RENAME_EXCHANGE
))
767 if (fc
->no_rename2
|| fc
->minor
< 23)
770 err
= fuse_rename_common(olddir
, oldent
, newdir
, newent
, flags
,
772 sizeof(struct fuse_rename2_in
));
773 if (err
== -ENOSYS
) {
778 err
= fuse_rename_common(olddir
, oldent
, newdir
, newent
, 0,
780 sizeof(struct fuse_rename_in
));
786 static int fuse_link(struct dentry
*entry
, struct inode
*newdir
,
787 struct dentry
*newent
)
790 struct fuse_link_in inarg
;
791 struct inode
*inode
= d_inode(entry
);
792 struct fuse_conn
*fc
= get_fuse_conn(inode
);
795 memset(&inarg
, 0, sizeof(inarg
));
796 inarg
.oldnodeid
= get_node_id(inode
);
797 args
.in
.h
.opcode
= FUSE_LINK
;
799 args
.in
.args
[0].size
= sizeof(inarg
);
800 args
.in
.args
[0].value
= &inarg
;
801 args
.in
.args
[1].size
= newent
->d_name
.len
+ 1;
802 args
.in
.args
[1].value
= newent
->d_name
.name
;
803 err
= create_new_entry(fc
, &args
, newdir
, newent
, inode
->i_mode
);
804 /* Contrary to "normal" filesystems it can happen that link
805 makes two "logical" inodes point to the same "physical"
806 inode. We invalidate the attributes of the old one, so it
807 will reflect changes in the backing inode (link count,
811 struct fuse_inode
*fi
= get_fuse_inode(inode
);
813 spin_lock(&fc
->lock
);
814 fi
->attr_version
= ++fc
->attr_version
;
816 spin_unlock(&fc
->lock
);
817 fuse_invalidate_attr(inode
);
818 fuse_update_ctime(inode
);
819 } else if (err
== -EINTR
) {
820 fuse_invalidate_attr(inode
);
825 static void fuse_fillattr(struct inode
*inode
, struct fuse_attr
*attr
,
828 unsigned int blkbits
;
829 struct fuse_conn
*fc
= get_fuse_conn(inode
);
831 /* see the comment in fuse_change_attributes() */
832 if (fc
->writeback_cache
&& S_ISREG(inode
->i_mode
)) {
833 attr
->size
= i_size_read(inode
);
834 attr
->mtime
= inode
->i_mtime
.tv_sec
;
835 attr
->mtimensec
= inode
->i_mtime
.tv_nsec
;
836 attr
->ctime
= inode
->i_ctime
.tv_sec
;
837 attr
->ctimensec
= inode
->i_ctime
.tv_nsec
;
840 stat
->dev
= inode
->i_sb
->s_dev
;
841 stat
->ino
= attr
->ino
;
842 stat
->mode
= (inode
->i_mode
& S_IFMT
) | (attr
->mode
& 07777);
843 stat
->nlink
= attr
->nlink
;
844 stat
->uid
= make_kuid(&init_user_ns
, attr
->uid
);
845 stat
->gid
= make_kgid(&init_user_ns
, attr
->gid
);
846 stat
->rdev
= inode
->i_rdev
;
847 stat
->atime
.tv_sec
= attr
->atime
;
848 stat
->atime
.tv_nsec
= attr
->atimensec
;
849 stat
->mtime
.tv_sec
= attr
->mtime
;
850 stat
->mtime
.tv_nsec
= attr
->mtimensec
;
851 stat
->ctime
.tv_sec
= attr
->ctime
;
852 stat
->ctime
.tv_nsec
= attr
->ctimensec
;
853 stat
->size
= attr
->size
;
854 stat
->blocks
= attr
->blocks
;
856 if (attr
->blksize
!= 0)
857 blkbits
= ilog2(attr
->blksize
);
859 blkbits
= inode
->i_sb
->s_blocksize_bits
;
861 stat
->blksize
= 1 << blkbits
;
864 static int fuse_do_getattr(struct inode
*inode
, struct kstat
*stat
,
868 struct fuse_getattr_in inarg
;
869 struct fuse_attr_out outarg
;
870 struct fuse_conn
*fc
= get_fuse_conn(inode
);
874 attr_version
= fuse_get_attr_version(fc
);
876 memset(&inarg
, 0, sizeof(inarg
));
877 memset(&outarg
, 0, sizeof(outarg
));
878 /* Directories have separate file-handle space */
879 if (file
&& S_ISREG(inode
->i_mode
)) {
880 struct fuse_file
*ff
= file
->private_data
;
882 inarg
.getattr_flags
|= FUSE_GETATTR_FH
;
885 args
.in
.h
.opcode
= FUSE_GETATTR
;
886 args
.in
.h
.nodeid
= get_node_id(inode
);
888 args
.in
.args
[0].size
= sizeof(inarg
);
889 args
.in
.args
[0].value
= &inarg
;
890 args
.out
.numargs
= 1;
891 args
.out
.args
[0].size
= sizeof(outarg
);
892 args
.out
.args
[0].value
= &outarg
;
893 err
= fuse_simple_request(fc
, &args
);
895 if ((inode
->i_mode
^ outarg
.attr
.mode
) & S_IFMT
) {
896 make_bad_inode(inode
);
899 fuse_change_attributes(inode
, &outarg
.attr
,
900 attr_timeout(&outarg
),
903 fuse_fillattr(inode
, &outarg
.attr
, stat
);
909 int fuse_update_attributes(struct inode
*inode
, struct kstat
*stat
,
910 struct file
*file
, bool *refreshed
)
912 struct fuse_inode
*fi
= get_fuse_inode(inode
);
916 if (time_before64(fi
->i_time
, get_jiffies_64())) {
918 err
= fuse_do_getattr(inode
, stat
, file
);
923 generic_fillattr(inode
, stat
);
924 stat
->mode
= fi
->orig_i_mode
;
925 stat
->ino
= fi
->orig_ino
;
929 if (refreshed
!= NULL
)
935 int fuse_reverse_inval_entry(struct super_block
*sb
, u64 parent_nodeid
,
936 u64 child_nodeid
, struct qstr
*name
)
939 struct inode
*parent
;
941 struct dentry
*entry
;
943 parent
= ilookup5(sb
, parent_nodeid
, fuse_inode_eq
, &parent_nodeid
);
948 if (!S_ISDIR(parent
->i_mode
))
952 dir
= d_find_alias(parent
);
956 name
->hash
= full_name_hash(dir
, name
->name
, name
->len
);
957 entry
= d_lookup(dir
, name
);
962 fuse_invalidate_attr(parent
);
963 fuse_invalidate_entry(entry
);
965 if (child_nodeid
!= 0 && d_really_is_positive(entry
)) {
966 inode_lock(d_inode(entry
));
967 if (get_node_id(d_inode(entry
)) != child_nodeid
) {
971 if (d_mountpoint(entry
)) {
975 if (d_is_dir(entry
)) {
976 shrink_dcache_parent(entry
);
977 if (!simple_empty(entry
)) {
981 d_inode(entry
)->i_flags
|= S_DEAD
;
984 clear_nlink(d_inode(entry
));
987 inode_unlock(d_inode(entry
));
996 inode_unlock(parent
);
1002 * Calling into a user-controlled filesystem gives the filesystem
1003 * daemon ptrace-like capabilities over the current process. This
1004 * means, that the filesystem daemon is able to record the exact
1005 * filesystem operations performed, and can also control the behavior
1006 * of the requester process in otherwise impossible ways. For example
1007 * it can delay the operation for arbitrary length of time allowing
1008 * DoS against the requester.
1010 * For this reason only those processes can call into the filesystem,
1011 * for which the owner of the mount has ptrace privilege. This
1012 * excludes processes started by other users, suid or sgid processes.
1014 int fuse_allow_current_process(struct fuse_conn
*fc
)
1016 const struct cred
*cred
;
1018 if (fc
->flags
& FUSE_ALLOW_OTHER
)
1021 cred
= current_cred();
1022 if (uid_eq(cred
->euid
, fc
->user_id
) &&
1023 uid_eq(cred
->suid
, fc
->user_id
) &&
1024 uid_eq(cred
->uid
, fc
->user_id
) &&
1025 gid_eq(cred
->egid
, fc
->group_id
) &&
1026 gid_eq(cred
->sgid
, fc
->group_id
) &&
1027 gid_eq(cred
->gid
, fc
->group_id
))
1033 static int fuse_access(struct inode
*inode
, int mask
)
1035 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1037 struct fuse_access_in inarg
;
1040 BUG_ON(mask
& MAY_NOT_BLOCK
);
1045 memset(&inarg
, 0, sizeof(inarg
));
1046 inarg
.mask
= mask
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
);
1047 args
.in
.h
.opcode
= FUSE_ACCESS
;
1048 args
.in
.h
.nodeid
= get_node_id(inode
);
1049 args
.in
.numargs
= 1;
1050 args
.in
.args
[0].size
= sizeof(inarg
);
1051 args
.in
.args
[0].value
= &inarg
;
1052 err
= fuse_simple_request(fc
, &args
);
1053 if (err
== -ENOSYS
) {
1060 static int fuse_perm_getattr(struct inode
*inode
, int mask
)
1062 if (mask
& MAY_NOT_BLOCK
)
1065 return fuse_do_getattr(inode
, NULL
, NULL
);
1069 * Check permission. The two basic access models of FUSE are:
1071 * 1) Local access checking ('default_permissions' mount option) based
1072 * on file mode. This is the plain old disk filesystem permission
1075 * 2) "Remote" access checking, where server is responsible for
1076 * checking permission in each inode operation. An exception to this
1077 * is if ->permission() was invoked from sys_access() in which case an
1078 * access request is sent. Execute permission is still checked
1079 * locally based on file mode.
1081 static int fuse_permission(struct inode
*inode
, int mask
)
1083 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1084 bool refreshed
= false;
1087 if (!fuse_allow_current_process(fc
))
1091 * If attributes are needed, refresh them before proceeding
1093 if ((fc
->flags
& FUSE_DEFAULT_PERMISSIONS
) ||
1094 ((mask
& MAY_EXEC
) && S_ISREG(inode
->i_mode
))) {
1095 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1097 if (time_before64(fi
->i_time
, get_jiffies_64())) {
1100 err
= fuse_perm_getattr(inode
, mask
);
1106 if (fc
->flags
& FUSE_DEFAULT_PERMISSIONS
) {
1107 err
= generic_permission(inode
, mask
);
1109 /* If permission is denied, try to refresh file
1110 attributes. This is also needed, because the root
1111 node will at first have no permissions */
1112 if (err
== -EACCES
&& !refreshed
) {
1113 err
= fuse_perm_getattr(inode
, mask
);
1115 err
= generic_permission(inode
, mask
);
1118 /* Note: the opposite of the above test does not
1119 exist. So if permissions are revoked this won't be
1120 noticed immediately, only after the attribute
1121 timeout has expired */
1122 } else if (mask
& (MAY_ACCESS
| MAY_CHDIR
)) {
1123 err
= fuse_access(inode
, mask
);
1124 } else if ((mask
& MAY_EXEC
) && S_ISREG(inode
->i_mode
)) {
1125 if (!(inode
->i_mode
& S_IXUGO
)) {
1129 err
= fuse_perm_getattr(inode
, mask
);
1130 if (!err
&& !(inode
->i_mode
& S_IXUGO
))
1137 static int parse_dirfile(char *buf
, size_t nbytes
, struct file
*file
,
1138 struct dir_context
*ctx
)
1140 while (nbytes
>= FUSE_NAME_OFFSET
) {
1141 struct fuse_dirent
*dirent
= (struct fuse_dirent
*) buf
;
1142 size_t reclen
= FUSE_DIRENT_SIZE(dirent
);
1143 if (!dirent
->namelen
|| dirent
->namelen
> FUSE_NAME_MAX
)
1145 if (reclen
> nbytes
)
1147 if (memchr(dirent
->name
, '/', dirent
->namelen
) != NULL
)
1150 if (!dir_emit(ctx
, dirent
->name
, dirent
->namelen
,
1151 dirent
->ino
, dirent
->type
))
1156 ctx
->pos
= dirent
->off
;
1162 static int fuse_direntplus_link(struct file
*file
,
1163 struct fuse_direntplus
*direntplus
,
1166 struct fuse_entry_out
*o
= &direntplus
->entry_out
;
1167 struct fuse_dirent
*dirent
= &direntplus
->dirent
;
1168 struct dentry
*parent
= file
->f_path
.dentry
;
1169 struct qstr name
= QSTR_INIT(dirent
->name
, dirent
->namelen
);
1170 struct dentry
*dentry
;
1171 struct dentry
*alias
;
1172 struct inode
*dir
= d_inode(parent
);
1173 struct fuse_conn
*fc
;
1174 struct inode
*inode
;
1175 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1179 * Unlike in the case of fuse_lookup, zero nodeid does not mean
1180 * ENOENT. Instead, it only means the userspace filesystem did
1181 * not want to return attributes/handle for this entry.
1188 if (name
.name
[0] == '.') {
1190 * We could potentially refresh the attributes of the directory
1195 if (name
.name
[1] == '.' && name
.len
== 2)
1199 if (invalid_nodeid(o
->nodeid
))
1201 if (!fuse_valid_type(o
->attr
.mode
))
1204 fc
= get_fuse_conn(dir
);
1206 name
.hash
= full_name_hash(parent
, name
.name
, name
.len
);
1207 dentry
= d_lookup(parent
, &name
);
1210 dentry
= d_alloc_parallel(parent
, &name
, &wq
);
1212 return PTR_ERR(dentry
);
1214 if (!d_in_lookup(dentry
)) {
1215 struct fuse_inode
*fi
;
1216 inode
= d_inode(dentry
);
1218 get_node_id(inode
) != o
->nodeid
||
1219 ((o
->attr
.mode
^ inode
->i_mode
) & S_IFMT
)) {
1220 d_invalidate(dentry
);
1224 if (is_bad_inode(inode
)) {
1229 fi
= get_fuse_inode(inode
);
1230 spin_lock(&fc
->lock
);
1232 spin_unlock(&fc
->lock
);
1234 fuse_change_attributes(inode
, &o
->attr
,
1235 entry_attr_timeout(o
),
1238 * The other branch comes via fuse_iget()
1239 * which bumps nlookup inside
1242 inode
= fuse_iget(dir
->i_sb
, o
->nodeid
, o
->generation
,
1243 &o
->attr
, entry_attr_timeout(o
),
1246 inode
= ERR_PTR(-ENOMEM
);
1248 alias
= d_splice_alias(inode
, dentry
);
1249 d_lookup_done(dentry
);
1255 return PTR_ERR(dentry
);
1257 if (fc
->readdirplus_auto
)
1258 set_bit(FUSE_I_INIT_RDPLUS
, &get_fuse_inode(inode
)->state
);
1259 fuse_change_entry_timeout(dentry
, o
);
1265 static int parse_dirplusfile(char *buf
, size_t nbytes
, struct file
*file
,
1266 struct dir_context
*ctx
, u64 attr_version
)
1268 struct fuse_direntplus
*direntplus
;
1269 struct fuse_dirent
*dirent
;
1274 while (nbytes
>= FUSE_NAME_OFFSET_DIRENTPLUS
) {
1275 direntplus
= (struct fuse_direntplus
*) buf
;
1276 dirent
= &direntplus
->dirent
;
1277 reclen
= FUSE_DIRENTPLUS_SIZE(direntplus
);
1279 if (!dirent
->namelen
|| dirent
->namelen
> FUSE_NAME_MAX
)
1281 if (reclen
> nbytes
)
1283 if (memchr(dirent
->name
, '/', dirent
->namelen
) != NULL
)
1287 /* We fill entries into dstbuf only as much as
1288 it can hold. But we still continue iterating
1289 over remaining entries to link them. If not,
1290 we need to send a FORGET for each of those
1291 which we did not link.
1293 over
= !dir_emit(ctx
, dirent
->name
, dirent
->namelen
,
1294 dirent
->ino
, dirent
->type
);
1295 ctx
->pos
= dirent
->off
;
1301 ret
= fuse_direntplus_link(file
, direntplus
, attr_version
);
1303 fuse_force_forget(file
, direntplus
->entry_out
.nodeid
);
1309 static int fuse_readdir(struct file
*file
, struct dir_context
*ctx
)
1314 struct inode
*inode
= file_inode(file
);
1315 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1316 struct fuse_req
*req
;
1317 u64 attr_version
= 0;
1319 if (is_bad_inode(inode
))
1322 req
= fuse_get_req(fc
, 1);
1324 return PTR_ERR(req
);
1326 page
= alloc_page(GFP_KERNEL
);
1328 fuse_put_request(fc
, req
);
1332 plus
= fuse_use_readdirplus(inode
, ctx
);
1333 req
->out
.argpages
= 1;
1335 req
->pages
[0] = page
;
1336 req
->page_descs
[0].length
= PAGE_SIZE
;
1338 attr_version
= fuse_get_attr_version(fc
);
1339 fuse_read_fill(req
, file
, ctx
->pos
, PAGE_SIZE
,
1342 fuse_read_fill(req
, file
, ctx
->pos
, PAGE_SIZE
,
1345 fuse_request_send(fc
, req
);
1346 nbytes
= req
->out
.args
[0].size
;
1347 err
= req
->out
.h
.error
;
1348 fuse_put_request(fc
, req
);
1351 err
= parse_dirplusfile(page_address(page
), nbytes
,
1355 err
= parse_dirfile(page_address(page
), nbytes
, file
,
1361 fuse_invalidate_atime(inode
);
1365 static const char *fuse_get_link(struct dentry
*dentry
,
1366 struct inode
*inode
,
1367 struct delayed_call
*done
)
1369 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1375 return ERR_PTR(-ECHILD
);
1377 link
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
1379 return ERR_PTR(-ENOMEM
);
1381 args
.in
.h
.opcode
= FUSE_READLINK
;
1382 args
.in
.h
.nodeid
= get_node_id(inode
);
1383 args
.out
.argvar
= 1;
1384 args
.out
.numargs
= 1;
1385 args
.out
.args
[0].size
= PAGE_SIZE
- 1;
1386 args
.out
.args
[0].value
= link
;
1387 ret
= fuse_simple_request(fc
, &args
);
1390 link
= ERR_PTR(ret
);
1393 set_delayed_call(done
, kfree_link
, link
);
1395 fuse_invalidate_atime(inode
);
1399 static int fuse_dir_open(struct inode
*inode
, struct file
*file
)
1401 return fuse_open_common(inode
, file
, true);
1404 static int fuse_dir_release(struct inode
*inode
, struct file
*file
)
1406 fuse_release_common(file
, FUSE_RELEASEDIR
);
1411 static int fuse_dir_fsync(struct file
*file
, loff_t start
, loff_t end
,
1414 return fuse_fsync_common(file
, start
, end
, datasync
, 1);
1417 static long fuse_dir_ioctl(struct file
*file
, unsigned int cmd
,
1420 struct fuse_conn
*fc
= get_fuse_conn(file
->f_mapping
->host
);
1422 /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
1426 return fuse_ioctl_common(file
, cmd
, arg
, FUSE_IOCTL_DIR
);
1429 static long fuse_dir_compat_ioctl(struct file
*file
, unsigned int cmd
,
1432 struct fuse_conn
*fc
= get_fuse_conn(file
->f_mapping
->host
);
1437 return fuse_ioctl_common(file
, cmd
, arg
,
1438 FUSE_IOCTL_COMPAT
| FUSE_IOCTL_DIR
);
1441 static bool update_mtime(unsigned ivalid
, bool trust_local_mtime
)
1443 /* Always update if mtime is explicitly set */
1444 if (ivalid
& ATTR_MTIME_SET
)
1447 /* Or if kernel i_mtime is the official one */
1448 if (trust_local_mtime
)
1451 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1452 if ((ivalid
& ATTR_SIZE
) && (ivalid
& (ATTR_OPEN
| ATTR_FILE
)))
1455 /* In all other cases update */
1459 static void iattr_to_fattr(struct iattr
*iattr
, struct fuse_setattr_in
*arg
,
1460 bool trust_local_cmtime
)
1462 unsigned ivalid
= iattr
->ia_valid
;
1464 if (ivalid
& ATTR_MODE
)
1465 arg
->valid
|= FATTR_MODE
, arg
->mode
= iattr
->ia_mode
;
1466 if (ivalid
& ATTR_UID
)
1467 arg
->valid
|= FATTR_UID
, arg
->uid
= from_kuid(&init_user_ns
, iattr
->ia_uid
);
1468 if (ivalid
& ATTR_GID
)
1469 arg
->valid
|= FATTR_GID
, arg
->gid
= from_kgid(&init_user_ns
, iattr
->ia_gid
);
1470 if (ivalid
& ATTR_SIZE
)
1471 arg
->valid
|= FATTR_SIZE
, arg
->size
= iattr
->ia_size
;
1472 if (ivalid
& ATTR_ATIME
) {
1473 arg
->valid
|= FATTR_ATIME
;
1474 arg
->atime
= iattr
->ia_atime
.tv_sec
;
1475 arg
->atimensec
= iattr
->ia_atime
.tv_nsec
;
1476 if (!(ivalid
& ATTR_ATIME_SET
))
1477 arg
->valid
|= FATTR_ATIME_NOW
;
1479 if ((ivalid
& ATTR_MTIME
) && update_mtime(ivalid
, trust_local_cmtime
)) {
1480 arg
->valid
|= FATTR_MTIME
;
1481 arg
->mtime
= iattr
->ia_mtime
.tv_sec
;
1482 arg
->mtimensec
= iattr
->ia_mtime
.tv_nsec
;
1483 if (!(ivalid
& ATTR_MTIME_SET
) && !trust_local_cmtime
)
1484 arg
->valid
|= FATTR_MTIME_NOW
;
1486 if ((ivalid
& ATTR_CTIME
) && trust_local_cmtime
) {
1487 arg
->valid
|= FATTR_CTIME
;
1488 arg
->ctime
= iattr
->ia_ctime
.tv_sec
;
1489 arg
->ctimensec
= iattr
->ia_ctime
.tv_nsec
;
1494 * Prevent concurrent writepages on inode
1496 * This is done by adding a negative bias to the inode write counter
1497 * and waiting for all pending writes to finish.
1499 void fuse_set_nowrite(struct inode
*inode
)
1501 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1502 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1504 BUG_ON(!inode_is_locked(inode
));
1506 spin_lock(&fc
->lock
);
1507 BUG_ON(fi
->writectr
< 0);
1508 fi
->writectr
+= FUSE_NOWRITE
;
1509 spin_unlock(&fc
->lock
);
1510 wait_event(fi
->page_waitq
, fi
->writectr
== FUSE_NOWRITE
);
1514 * Allow writepages on inode
1516 * Remove the bias from the writecounter and send any queued
1519 static void __fuse_release_nowrite(struct inode
*inode
)
1521 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1523 BUG_ON(fi
->writectr
!= FUSE_NOWRITE
);
1525 fuse_flush_writepages(inode
);
1528 void fuse_release_nowrite(struct inode
*inode
)
1530 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1532 spin_lock(&fc
->lock
);
1533 __fuse_release_nowrite(inode
);
1534 spin_unlock(&fc
->lock
);
1537 static void fuse_setattr_fill(struct fuse_conn
*fc
, struct fuse_args
*args
,
1538 struct inode
*inode
,
1539 struct fuse_setattr_in
*inarg_p
,
1540 struct fuse_attr_out
*outarg_p
)
1542 args
->in
.h
.opcode
= FUSE_SETATTR
;
1543 args
->in
.h
.nodeid
= get_node_id(inode
);
1544 args
->in
.numargs
= 1;
1545 args
->in
.args
[0].size
= sizeof(*inarg_p
);
1546 args
->in
.args
[0].value
= inarg_p
;
1547 args
->out
.numargs
= 1;
1548 args
->out
.args
[0].size
= sizeof(*outarg_p
);
1549 args
->out
.args
[0].value
= outarg_p
;
1553 * Flush inode->i_mtime to the server
1555 int fuse_flush_times(struct inode
*inode
, struct fuse_file
*ff
)
1557 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1559 struct fuse_setattr_in inarg
;
1560 struct fuse_attr_out outarg
;
1562 memset(&inarg
, 0, sizeof(inarg
));
1563 memset(&outarg
, 0, sizeof(outarg
));
1565 inarg
.valid
= FATTR_MTIME
;
1566 inarg
.mtime
= inode
->i_mtime
.tv_sec
;
1567 inarg
.mtimensec
= inode
->i_mtime
.tv_nsec
;
1568 if (fc
->minor
>= 23) {
1569 inarg
.valid
|= FATTR_CTIME
;
1570 inarg
.ctime
= inode
->i_ctime
.tv_sec
;
1571 inarg
.ctimensec
= inode
->i_ctime
.tv_nsec
;
1574 inarg
.valid
|= FATTR_FH
;
1577 fuse_setattr_fill(fc
, &args
, inode
, &inarg
, &outarg
);
1579 return fuse_simple_request(fc
, &args
);
1583 * Set attributes, and at the same time refresh them.
1585 * Truncation is slightly complicated, because the 'truncate' request
1586 * may fail, in which case we don't want to touch the mapping.
1587 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1588 * and the actual truncation by hand.
1590 int fuse_do_setattr(struct inode
*inode
, struct iattr
*attr
,
1593 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1594 struct fuse_inode
*fi
= get_fuse_inode(inode
);
1596 struct fuse_setattr_in inarg
;
1597 struct fuse_attr_out outarg
;
1598 bool is_truncate
= false;
1599 bool is_wb
= fc
->writeback_cache
;
1602 bool trust_local_cmtime
= is_wb
&& S_ISREG(inode
->i_mode
);
1604 if (!(fc
->flags
& FUSE_DEFAULT_PERMISSIONS
))
1605 attr
->ia_valid
|= ATTR_FORCE
;
1607 err
= inode_change_ok(inode
, attr
);
1611 if (attr
->ia_valid
& ATTR_OPEN
) {
1612 if (fc
->atomic_o_trunc
)
1617 if (attr
->ia_valid
& ATTR_SIZE
)
1621 fuse_set_nowrite(inode
);
1622 set_bit(FUSE_I_SIZE_UNSTABLE
, &fi
->state
);
1623 if (trust_local_cmtime
&& attr
->ia_size
!= inode
->i_size
)
1624 attr
->ia_valid
|= ATTR_MTIME
| ATTR_CTIME
;
1627 memset(&inarg
, 0, sizeof(inarg
));
1628 memset(&outarg
, 0, sizeof(outarg
));
1629 iattr_to_fattr(attr
, &inarg
, trust_local_cmtime
);
1631 struct fuse_file
*ff
= file
->private_data
;
1632 inarg
.valid
|= FATTR_FH
;
1635 if (attr
->ia_valid
& ATTR_SIZE
) {
1636 /* For mandatory locking in truncate */
1637 inarg
.valid
|= FATTR_LOCKOWNER
;
1638 inarg
.lock_owner
= fuse_lock_owner_id(fc
, current
->files
);
1640 fuse_setattr_fill(fc
, &args
, inode
, &inarg
, &outarg
);
1641 err
= fuse_simple_request(fc
, &args
);
1644 fuse_invalidate_attr(inode
);
1648 if ((inode
->i_mode
^ outarg
.attr
.mode
) & S_IFMT
) {
1649 make_bad_inode(inode
);
1654 spin_lock(&fc
->lock
);
1655 /* the kernel maintains i_mtime locally */
1656 if (trust_local_cmtime
) {
1657 if (attr
->ia_valid
& ATTR_MTIME
)
1658 inode
->i_mtime
= attr
->ia_mtime
;
1659 if (attr
->ia_valid
& ATTR_CTIME
)
1660 inode
->i_ctime
= attr
->ia_ctime
;
1661 /* FIXME: clear I_DIRTY_SYNC? */
1664 fuse_change_attributes_common(inode
, &outarg
.attr
,
1665 attr_timeout(&outarg
));
1666 oldsize
= inode
->i_size
;
1667 /* see the comment in fuse_change_attributes() */
1668 if (!is_wb
|| is_truncate
|| !S_ISREG(inode
->i_mode
))
1669 i_size_write(inode
, outarg
.attr
.size
);
1672 /* NOTE: this may release/reacquire fc->lock */
1673 __fuse_release_nowrite(inode
);
1675 spin_unlock(&fc
->lock
);
1678 * Only call invalidate_inode_pages2() after removing
1679 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1681 if ((is_truncate
|| !is_wb
) &&
1682 S_ISREG(inode
->i_mode
) && oldsize
!= outarg
.attr
.size
) {
1683 truncate_pagecache(inode
, outarg
.attr
.size
);
1684 invalidate_inode_pages2(inode
->i_mapping
);
1687 clear_bit(FUSE_I_SIZE_UNSTABLE
, &fi
->state
);
1692 fuse_release_nowrite(inode
);
1694 clear_bit(FUSE_I_SIZE_UNSTABLE
, &fi
->state
);
1698 static int fuse_setattr(struct dentry
*entry
, struct iattr
*attr
)
1700 struct inode
*inode
= d_inode(entry
);
1702 if (!fuse_allow_current_process(get_fuse_conn(inode
)))
1705 if (attr
->ia_valid
& ATTR_FILE
)
1706 return fuse_do_setattr(inode
, attr
, attr
->ia_file
);
1708 return fuse_do_setattr(inode
, attr
, NULL
);
1711 static int fuse_getattr(struct vfsmount
*mnt
, struct dentry
*entry
,
1714 struct inode
*inode
= d_inode(entry
);
1715 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1717 if (!fuse_allow_current_process(fc
))
1720 return fuse_update_attributes(inode
, stat
, NULL
, NULL
);
1723 static int fuse_setxattr(struct dentry
*unused
, struct inode
*inode
,
1724 const char *name
, const void *value
,
1725 size_t size
, int flags
)
1727 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1729 struct fuse_setxattr_in inarg
;
1732 if (fc
->no_setxattr
)
1735 memset(&inarg
, 0, sizeof(inarg
));
1737 inarg
.flags
= flags
;
1738 args
.in
.h
.opcode
= FUSE_SETXATTR
;
1739 args
.in
.h
.nodeid
= get_node_id(inode
);
1740 args
.in
.numargs
= 3;
1741 args
.in
.args
[0].size
= sizeof(inarg
);
1742 args
.in
.args
[0].value
= &inarg
;
1743 args
.in
.args
[1].size
= strlen(name
) + 1;
1744 args
.in
.args
[1].value
= name
;
1745 args
.in
.args
[2].size
= size
;
1746 args
.in
.args
[2].value
= value
;
1747 err
= fuse_simple_request(fc
, &args
);
1748 if (err
== -ENOSYS
) {
1749 fc
->no_setxattr
= 1;
1753 fuse_invalidate_attr(inode
);
1754 fuse_update_ctime(inode
);
1759 static ssize_t
fuse_getxattr(struct dentry
*entry
, struct inode
*inode
,
1760 const char *name
, void *value
, size_t size
)
1762 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1764 struct fuse_getxattr_in inarg
;
1765 struct fuse_getxattr_out outarg
;
1768 if (fc
->no_getxattr
)
1771 memset(&inarg
, 0, sizeof(inarg
));
1773 args
.in
.h
.opcode
= FUSE_GETXATTR
;
1774 args
.in
.h
.nodeid
= get_node_id(inode
);
1775 args
.in
.numargs
= 2;
1776 args
.in
.args
[0].size
= sizeof(inarg
);
1777 args
.in
.args
[0].value
= &inarg
;
1778 args
.in
.args
[1].size
= strlen(name
) + 1;
1779 args
.in
.args
[1].value
= name
;
1780 /* This is really two different operations rolled into one */
1781 args
.out
.numargs
= 1;
1783 args
.out
.argvar
= 1;
1784 args
.out
.args
[0].size
= size
;
1785 args
.out
.args
[0].value
= value
;
1787 args
.out
.args
[0].size
= sizeof(outarg
);
1788 args
.out
.args
[0].value
= &outarg
;
1790 ret
= fuse_simple_request(fc
, &args
);
1793 if (ret
== -ENOSYS
) {
1794 fc
->no_getxattr
= 1;
1800 static ssize_t
fuse_listxattr(struct dentry
*entry
, char *list
, size_t size
)
1802 struct inode
*inode
= d_inode(entry
);
1803 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1805 struct fuse_getxattr_in inarg
;
1806 struct fuse_getxattr_out outarg
;
1809 if (!fuse_allow_current_process(fc
))
1812 if (fc
->no_listxattr
)
1815 memset(&inarg
, 0, sizeof(inarg
));
1817 args
.in
.h
.opcode
= FUSE_LISTXATTR
;
1818 args
.in
.h
.nodeid
= get_node_id(inode
);
1819 args
.in
.numargs
= 1;
1820 args
.in
.args
[0].size
= sizeof(inarg
);
1821 args
.in
.args
[0].value
= &inarg
;
1822 /* This is really two different operations rolled into one */
1823 args
.out
.numargs
= 1;
1825 args
.out
.argvar
= 1;
1826 args
.out
.args
[0].size
= size
;
1827 args
.out
.args
[0].value
= list
;
1829 args
.out
.args
[0].size
= sizeof(outarg
);
1830 args
.out
.args
[0].value
= &outarg
;
1832 ret
= fuse_simple_request(fc
, &args
);
1835 if (ret
== -ENOSYS
) {
1836 fc
->no_listxattr
= 1;
1842 static int fuse_removexattr(struct dentry
*entry
, const char *name
)
1844 struct inode
*inode
= d_inode(entry
);
1845 struct fuse_conn
*fc
= get_fuse_conn(inode
);
1849 if (fc
->no_removexattr
)
1852 args
.in
.h
.opcode
= FUSE_REMOVEXATTR
;
1853 args
.in
.h
.nodeid
= get_node_id(inode
);
1854 args
.in
.numargs
= 1;
1855 args
.in
.args
[0].size
= strlen(name
) + 1;
1856 args
.in
.args
[0].value
= name
;
1857 err
= fuse_simple_request(fc
, &args
);
1858 if (err
== -ENOSYS
) {
1859 fc
->no_removexattr
= 1;
1863 fuse_invalidate_attr(inode
);
1864 fuse_update_ctime(inode
);
1869 static const struct inode_operations fuse_dir_inode_operations
= {
1870 .lookup
= fuse_lookup
,
1871 .mkdir
= fuse_mkdir
,
1872 .symlink
= fuse_symlink
,
1873 .unlink
= fuse_unlink
,
1874 .rmdir
= fuse_rmdir
,
1875 .rename2
= fuse_rename2
,
1877 .setattr
= fuse_setattr
,
1878 .create
= fuse_create
,
1879 .atomic_open
= fuse_atomic_open
,
1880 .mknod
= fuse_mknod
,
1881 .permission
= fuse_permission
,
1882 .getattr
= fuse_getattr
,
1883 .setxattr
= fuse_setxattr
,
1884 .getxattr
= fuse_getxattr
,
1885 .listxattr
= fuse_listxattr
,
1886 .removexattr
= fuse_removexattr
,
1889 static const struct file_operations fuse_dir_operations
= {
1890 .llseek
= generic_file_llseek
,
1891 .read
= generic_read_dir
,
1892 .iterate_shared
= fuse_readdir
,
1893 .open
= fuse_dir_open
,
1894 .release
= fuse_dir_release
,
1895 .fsync
= fuse_dir_fsync
,
1896 .unlocked_ioctl
= fuse_dir_ioctl
,
1897 .compat_ioctl
= fuse_dir_compat_ioctl
,
1900 static const struct inode_operations fuse_common_inode_operations
= {
1901 .setattr
= fuse_setattr
,
1902 .permission
= fuse_permission
,
1903 .getattr
= fuse_getattr
,
1904 .setxattr
= fuse_setxattr
,
1905 .getxattr
= fuse_getxattr
,
1906 .listxattr
= fuse_listxattr
,
1907 .removexattr
= fuse_removexattr
,
1910 static const struct inode_operations fuse_symlink_inode_operations
= {
1911 .setattr
= fuse_setattr
,
1912 .get_link
= fuse_get_link
,
1913 .readlink
= generic_readlink
,
1914 .getattr
= fuse_getattr
,
1915 .setxattr
= fuse_setxattr
,
1916 .getxattr
= fuse_getxattr
,
1917 .listxattr
= fuse_listxattr
,
1918 .removexattr
= fuse_removexattr
,
1921 void fuse_init_common(struct inode
*inode
)
1923 inode
->i_op
= &fuse_common_inode_operations
;
1926 void fuse_init_dir(struct inode
*inode
)
1928 inode
->i_op
= &fuse_dir_inode_operations
;
1929 inode
->i_fop
= &fuse_dir_operations
;
1932 void fuse_init_symlink(struct inode
*inode
)
1934 inode
->i_op
= &fuse_symlink_inode_operations
;