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>
16 #include <linux/xattr.h>
17 #include <linux/posix_acl.h>
19 static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx)
21 struct fuse_conn *fc = get_fuse_conn(dir);
22 struct fuse_inode *fi = get_fuse_inode(dir);
24 if (!fc->do_readdirplus)
26 if (!fc->readdirplus_auto)
28 if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
35 static void fuse_advise_use_readdirplus(struct inode *dir)
37 struct fuse_inode *fi = get_fuse_inode(dir);
39 set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state);
47 static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
49 ((union fuse_dentry *) entry->d_fsdata)->time = time;
52 static inline u64 fuse_dentry_time(struct dentry *entry)
54 return ((union fuse_dentry *) entry->d_fsdata)->time;
58 * FUSE caches dentries and attributes with separate timeout. The
59 * time in jiffies until the dentry/attributes are valid is stored in
60 * dentry->d_fsdata and fuse_inode->i_time respectively.
64 * Calculate the time in jiffies until a dentry/attributes are valid
66 static u64 time_to_jiffies(unsigned long sec, unsigned long nsec)
69 struct timespec ts = {sec, nsec};
70 return get_jiffies_64() + timespec_to_jiffies(&ts);
76 * Set dentry and possibly attribute timeouts from the lookup/mk*
79 static void fuse_change_entry_timeout(struct dentry *entry,
80 struct fuse_entry_out *o)
82 fuse_dentry_settime(entry,
83 time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
86 static u64 attr_timeout(struct fuse_attr_out *o)
88 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
91 static u64 entry_attr_timeout(struct fuse_entry_out *o)
93 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
97 * Mark the attributes as stale, so that at the next call to
98 * ->getattr() they will be fetched from userspace
100 void fuse_invalidate_attr(struct inode *inode)
102 get_fuse_inode(inode)->i_time = 0;
106 * Mark the attributes as stale due to an atime change. Avoid the invalidate if
109 void fuse_invalidate_atime(struct inode *inode)
111 if (!IS_RDONLY(inode))
112 fuse_invalidate_attr(inode);
116 * Just mark the entry as stale, so that a next attempt to look it up
117 * will result in a new lookup call to userspace
119 * This is called when a dentry is about to become negative and the
120 * timeout is unknown (unlink, rmdir, rename and in some cases
123 void fuse_invalidate_entry_cache(struct dentry *entry)
125 fuse_dentry_settime(entry, 0);
129 * Same as fuse_invalidate_entry_cache(), but also try to remove the
130 * dentry from the hash
132 static void fuse_invalidate_entry(struct dentry *entry)
135 fuse_invalidate_entry_cache(entry);
138 static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args,
139 u64 nodeid, const struct qstr *name,
140 struct fuse_entry_out *outarg)
142 memset(outarg, 0, sizeof(struct fuse_entry_out));
143 args->in.h.opcode = FUSE_LOOKUP;
144 args->in.h.nodeid = nodeid;
145 args->in.numargs = 1;
146 args->in.args[0].size = name->len + 1;
147 args->in.args[0].value = name->name;
148 args->out.numargs = 1;
149 args->out.args[0].size = sizeof(struct fuse_entry_out);
150 args->out.args[0].value = outarg;
153 u64 fuse_get_attr_version(struct fuse_conn *fc)
158 * The spin lock isn't actually needed on 64bit archs, but we
159 * don't yet care too much about such optimizations.
161 spin_lock(&fc->lock);
162 curr_version = fc->attr_version;
163 spin_unlock(&fc->lock);
169 * Check whether the dentry is still valid
171 * If the entry validity timeout has expired and the dentry is
172 * positive, try to redo the lookup. If the lookup results in a
173 * different inode, then let the VFS invalidate the dentry and redo
174 * the lookup once more. If the lookup results in the same inode,
175 * then refresh the attributes, timeouts and mark the dentry valid.
177 static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
180 struct dentry *parent;
181 struct fuse_conn *fc;
182 struct fuse_inode *fi;
185 inode = d_inode_rcu(entry);
186 if (inode && is_bad_inode(inode))
188 else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
189 (flags & LOOKUP_REVAL)) {
190 struct fuse_entry_out outarg;
192 struct fuse_forget_link *forget;
195 /* For negative dentries, always do a fresh lookup */
200 if (flags & LOOKUP_RCU)
203 fc = get_fuse_conn(inode);
205 forget = fuse_alloc_forget();
210 attr_version = fuse_get_attr_version(fc);
212 parent = dget_parent(entry);
213 fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)),
214 &entry->d_name, &outarg);
215 ret = fuse_simple_request(fc, &args);
217 /* Zero nodeid is same as -ENOENT */
218 if (!ret && !outarg.nodeid)
221 fi = get_fuse_inode(inode);
222 if (outarg.nodeid != get_node_id(inode)) {
223 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
226 spin_lock(&fc->lock);
228 spin_unlock(&fc->lock);
233 if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
236 forget_all_cached_acls(inode);
237 fuse_change_attributes(inode, &outarg.attr,
238 entry_attr_timeout(&outarg),
240 fuse_change_entry_timeout(entry, &outarg);
242 fi = get_fuse_inode(inode);
243 if (flags & LOOKUP_RCU) {
244 if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
246 } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
247 parent = dget_parent(entry);
248 fuse_advise_use_readdirplus(d_inode(parent));
261 static int invalid_nodeid(u64 nodeid)
263 return !nodeid || nodeid == FUSE_ROOT_ID;
266 static int fuse_dentry_init(struct dentry *dentry)
268 dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL);
270 return dentry->d_fsdata ? 0 : -ENOMEM;
272 static void fuse_dentry_release(struct dentry *dentry)
274 union fuse_dentry *fd = dentry->d_fsdata;
279 const struct dentry_operations fuse_dentry_operations = {
280 .d_revalidate = fuse_dentry_revalidate,
281 .d_init = fuse_dentry_init,
282 .d_release = fuse_dentry_release,
285 int fuse_valid_type(int m)
287 return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
288 S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
291 int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
292 struct fuse_entry_out *outarg, struct inode **inode)
294 struct fuse_conn *fc = get_fuse_conn_super(sb);
296 struct fuse_forget_link *forget;
302 if (name->len > FUSE_NAME_MAX)
306 forget = fuse_alloc_forget();
311 attr_version = fuse_get_attr_version(fc);
313 fuse_lookup_init(fc, &args, nodeid, name, outarg);
314 err = fuse_simple_request(fc, &args);
315 /* Zero nodeid is same as -ENOENT, but with valid timeout */
316 if (err || !outarg->nodeid)
322 if (!fuse_valid_type(outarg->attr.mode))
325 *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
326 &outarg->attr, entry_attr_timeout(outarg),
330 fuse_queue_forget(fc, forget, outarg->nodeid, 1);
341 static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
345 struct fuse_entry_out outarg;
347 struct dentry *newent;
348 bool outarg_valid = true;
350 fuse_lock_inode(dir);
351 err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
353 fuse_unlock_inode(dir);
354 if (err == -ENOENT) {
355 outarg_valid = false;
362 if (inode && get_node_id(inode) == FUSE_ROOT_ID)
365 newent = d_splice_alias(inode, entry);
366 err = PTR_ERR(newent);
370 entry = newent ? newent : entry;
372 fuse_change_entry_timeout(entry, &outarg);
374 fuse_invalidate_entry_cache(entry);
376 fuse_advise_use_readdirplus(dir);
386 * Atomic create+open operation
388 * If the filesystem doesn't support this, then fall back to separate
389 * 'mknod' + 'open' requests.
391 static int fuse_create_open(struct inode *dir, struct dentry *entry,
392 struct file *file, unsigned flags,
393 umode_t mode, int *opened)
397 struct fuse_conn *fc = get_fuse_conn(dir);
399 struct fuse_forget_link *forget;
400 struct fuse_create_in inarg;
401 struct fuse_open_out outopen;
402 struct fuse_entry_out outentry;
403 struct fuse_file *ff;
405 /* Userspace expects S_IFREG in create mode */
406 BUG_ON((mode & S_IFMT) != S_IFREG);
408 forget = fuse_alloc_forget();
414 ff = fuse_file_alloc(fc);
416 goto out_put_forget_req;
419 mode &= ~current_umask();
422 memset(&inarg, 0, sizeof(inarg));
423 memset(&outentry, 0, sizeof(outentry));
426 inarg.umask = current_umask();
427 args.in.h.opcode = FUSE_CREATE;
428 args.in.h.nodeid = get_node_id(dir);
430 args.in.args[0].size = sizeof(inarg);
431 args.in.args[0].value = &inarg;
432 args.in.args[1].size = entry->d_name.len + 1;
433 args.in.args[1].value = entry->d_name.name;
434 args.out.numargs = 2;
435 args.out.args[0].size = sizeof(outentry);
436 args.out.args[0].value = &outentry;
437 args.out.args[1].size = sizeof(outopen);
438 args.out.args[1].value = &outopen;
439 err = fuse_simple_request(fc, &args);
444 if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
448 ff->nodeid = outentry.nodeid;
449 ff->open_flags = outopen.open_flags;
450 inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
451 &outentry.attr, entry_attr_timeout(&outentry), 0);
453 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
454 fuse_sync_release(ff, flags);
455 fuse_queue_forget(fc, forget, outentry.nodeid, 1);
460 d_instantiate(entry, inode);
461 fuse_change_entry_timeout(entry, &outentry);
462 fuse_invalidate_attr(dir);
463 err = finish_open(file, entry, generic_file_open, opened);
465 fuse_sync_release(ff, flags);
467 file->private_data = fuse_file_get(ff);
468 fuse_finish_open(inode, file);
480 static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);
481 static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
482 struct file *file, unsigned flags,
483 umode_t mode, int *opened)
486 struct fuse_conn *fc = get_fuse_conn(dir);
487 struct dentry *res = NULL;
489 if (d_in_lookup(entry)) {
490 res = fuse_lookup(dir, entry, 0);
498 if (!(flags & O_CREAT) || d_really_is_positive(entry))
502 *opened |= FILE_CREATED;
507 err = fuse_create_open(dir, entry, file, flags, mode, opened);
508 if (err == -ENOSYS) {
517 err = fuse_mknod(dir, entry, mode, 0);
521 return finish_no_open(file, res);
525 * Code shared between mknod, mkdir, symlink and link
527 static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args,
528 struct inode *dir, struct dentry *entry,
531 struct fuse_entry_out outarg;
534 struct fuse_forget_link *forget;
536 forget = fuse_alloc_forget();
540 memset(&outarg, 0, sizeof(outarg));
541 args->in.h.nodeid = get_node_id(dir);
542 args->out.numargs = 1;
543 args->out.args[0].size = sizeof(outarg);
544 args->out.args[0].value = &outarg;
545 err = fuse_simple_request(fc, args);
547 goto out_put_forget_req;
550 if (invalid_nodeid(outarg.nodeid))
551 goto out_put_forget_req;
553 if ((outarg.attr.mode ^ mode) & S_IFMT)
554 goto out_put_forget_req;
556 inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
557 &outarg.attr, entry_attr_timeout(&outarg), 0);
559 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
564 err = d_instantiate_no_diralias(entry, inode);
568 fuse_change_entry_timeout(entry, &outarg);
569 fuse_invalidate_attr(dir);
577 static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
580 struct fuse_mknod_in inarg;
581 struct fuse_conn *fc = get_fuse_conn(dir);
585 mode &= ~current_umask();
587 memset(&inarg, 0, sizeof(inarg));
589 inarg.rdev = new_encode_dev(rdev);
590 inarg.umask = current_umask();
591 args.in.h.opcode = FUSE_MKNOD;
593 args.in.args[0].size = sizeof(inarg);
594 args.in.args[0].value = &inarg;
595 args.in.args[1].size = entry->d_name.len + 1;
596 args.in.args[1].value = entry->d_name.name;
597 return create_new_entry(fc, &args, dir, entry, mode);
600 static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
603 return fuse_mknod(dir, entry, mode, 0);
606 static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
608 struct fuse_mkdir_in inarg;
609 struct fuse_conn *fc = get_fuse_conn(dir);
613 mode &= ~current_umask();
615 memset(&inarg, 0, sizeof(inarg));
617 inarg.umask = current_umask();
618 args.in.h.opcode = FUSE_MKDIR;
620 args.in.args[0].size = sizeof(inarg);
621 args.in.args[0].value = &inarg;
622 args.in.args[1].size = entry->d_name.len + 1;
623 args.in.args[1].value = entry->d_name.name;
624 return create_new_entry(fc, &args, dir, entry, S_IFDIR);
627 static int fuse_symlink(struct inode *dir, struct dentry *entry,
630 struct fuse_conn *fc = get_fuse_conn(dir);
631 unsigned len = strlen(link) + 1;
634 args.in.h.opcode = FUSE_SYMLINK;
636 args.in.args[0].size = entry->d_name.len + 1;
637 args.in.args[0].value = entry->d_name.name;
638 args.in.args[1].size = len;
639 args.in.args[1].value = link;
640 return create_new_entry(fc, &args, dir, entry, S_IFLNK);
643 void fuse_update_ctime(struct inode *inode)
645 if (!IS_NOCMTIME(inode)) {
646 inode->i_ctime = current_fs_time(inode->i_sb);
647 mark_inode_dirty_sync(inode);
651 static int fuse_unlink(struct inode *dir, struct dentry *entry)
654 struct fuse_conn *fc = get_fuse_conn(dir);
657 args.in.h.opcode = FUSE_UNLINK;
658 args.in.h.nodeid = get_node_id(dir);
660 args.in.args[0].size = entry->d_name.len + 1;
661 args.in.args[0].value = entry->d_name.name;
662 err = fuse_simple_request(fc, &args);
664 struct inode *inode = d_inode(entry);
665 struct fuse_inode *fi = get_fuse_inode(inode);
667 spin_lock(&fc->lock);
668 fi->attr_version = ++fc->attr_version;
670 * If i_nlink == 0 then unlink doesn't make sense, yet this can
671 * happen if userspace filesystem is careless. It would be
672 * difficult to enforce correct nlink usage so just ignore this
675 if (inode->i_nlink > 0)
677 spin_unlock(&fc->lock);
678 fuse_invalidate_attr(inode);
679 fuse_invalidate_attr(dir);
680 fuse_invalidate_entry_cache(entry);
681 fuse_update_ctime(inode);
682 } else if (err == -EINTR)
683 fuse_invalidate_entry(entry);
687 static int fuse_rmdir(struct inode *dir, struct dentry *entry)
690 struct fuse_conn *fc = get_fuse_conn(dir);
693 args.in.h.opcode = FUSE_RMDIR;
694 args.in.h.nodeid = get_node_id(dir);
696 args.in.args[0].size = entry->d_name.len + 1;
697 args.in.args[0].value = entry->d_name.name;
698 err = fuse_simple_request(fc, &args);
700 clear_nlink(d_inode(entry));
701 fuse_invalidate_attr(dir);
702 fuse_invalidate_entry_cache(entry);
703 } else if (err == -EINTR)
704 fuse_invalidate_entry(entry);
708 static int fuse_rename_common(struct inode *olddir, struct dentry *oldent,
709 struct inode *newdir, struct dentry *newent,
710 unsigned int flags, int opcode, size_t argsize)
713 struct fuse_rename2_in inarg;
714 struct fuse_conn *fc = get_fuse_conn(olddir);
717 memset(&inarg, 0, argsize);
718 inarg.newdir = get_node_id(newdir);
720 args.in.h.opcode = opcode;
721 args.in.h.nodeid = get_node_id(olddir);
723 args.in.args[0].size = argsize;
724 args.in.args[0].value = &inarg;
725 args.in.args[1].size = oldent->d_name.len + 1;
726 args.in.args[1].value = oldent->d_name.name;
727 args.in.args[2].size = newent->d_name.len + 1;
728 args.in.args[2].value = newent->d_name.name;
729 err = fuse_simple_request(fc, &args);
732 fuse_invalidate_attr(d_inode(oldent));
733 fuse_update_ctime(d_inode(oldent));
735 if (flags & RENAME_EXCHANGE) {
736 fuse_invalidate_attr(d_inode(newent));
737 fuse_update_ctime(d_inode(newent));
740 fuse_invalidate_attr(olddir);
741 if (olddir != newdir)
742 fuse_invalidate_attr(newdir);
744 /* newent will end up negative */
745 if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) {
746 fuse_invalidate_attr(d_inode(newent));
747 fuse_invalidate_entry_cache(newent);
748 fuse_update_ctime(d_inode(newent));
750 } else if (err == -EINTR) {
751 /* If request was interrupted, DEITY only knows if the
752 rename actually took place. If the invalidation
753 fails (e.g. some process has CWD under the renamed
754 directory), then there can be inconsistency between
755 the dcache and the real filesystem. Tough luck. */
756 fuse_invalidate_entry(oldent);
757 if (d_really_is_positive(newent))
758 fuse_invalidate_entry(newent);
764 static int fuse_rename2(struct inode *olddir, struct dentry *oldent,
765 struct inode *newdir, struct dentry *newent,
768 struct fuse_conn *fc = get_fuse_conn(olddir);
771 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
775 if (fc->no_rename2 || fc->minor < 23)
778 err = fuse_rename_common(olddir, oldent, newdir, newent, flags,
780 sizeof(struct fuse_rename2_in));
781 if (err == -ENOSYS) {
786 err = fuse_rename_common(olddir, oldent, newdir, newent, 0,
788 sizeof(struct fuse_rename_in));
794 static int fuse_link(struct dentry *entry, struct inode *newdir,
795 struct dentry *newent)
798 struct fuse_link_in inarg;
799 struct inode *inode = d_inode(entry);
800 struct fuse_conn *fc = get_fuse_conn(inode);
803 memset(&inarg, 0, sizeof(inarg));
804 inarg.oldnodeid = get_node_id(inode);
805 args.in.h.opcode = FUSE_LINK;
807 args.in.args[0].size = sizeof(inarg);
808 args.in.args[0].value = &inarg;
809 args.in.args[1].size = newent->d_name.len + 1;
810 args.in.args[1].value = newent->d_name.name;
811 err = create_new_entry(fc, &args, newdir, newent, inode->i_mode);
812 /* Contrary to "normal" filesystems it can happen that link
813 makes two "logical" inodes point to the same "physical"
814 inode. We invalidate the attributes of the old one, so it
815 will reflect changes in the backing inode (link count,
819 struct fuse_inode *fi = get_fuse_inode(inode);
821 spin_lock(&fc->lock);
822 fi->attr_version = ++fc->attr_version;
824 spin_unlock(&fc->lock);
825 fuse_invalidate_attr(inode);
826 fuse_update_ctime(inode);
827 } else if (err == -EINTR) {
828 fuse_invalidate_attr(inode);
833 static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
836 unsigned int blkbits;
837 struct fuse_conn *fc = get_fuse_conn(inode);
839 /* see the comment in fuse_change_attributes() */
840 if (fc->writeback_cache && S_ISREG(inode->i_mode)) {
841 attr->size = i_size_read(inode);
842 attr->mtime = inode->i_mtime.tv_sec;
843 attr->mtimensec = inode->i_mtime.tv_nsec;
844 attr->ctime = inode->i_ctime.tv_sec;
845 attr->ctimensec = inode->i_ctime.tv_nsec;
848 stat->dev = inode->i_sb->s_dev;
849 stat->ino = attr->ino;
850 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
851 stat->nlink = attr->nlink;
852 stat->uid = make_kuid(&init_user_ns, attr->uid);
853 stat->gid = make_kgid(&init_user_ns, attr->gid);
854 stat->rdev = inode->i_rdev;
855 stat->atime.tv_sec = attr->atime;
856 stat->atime.tv_nsec = attr->atimensec;
857 stat->mtime.tv_sec = attr->mtime;
858 stat->mtime.tv_nsec = attr->mtimensec;
859 stat->ctime.tv_sec = attr->ctime;
860 stat->ctime.tv_nsec = attr->ctimensec;
861 stat->size = attr->size;
862 stat->blocks = attr->blocks;
864 if (attr->blksize != 0)
865 blkbits = ilog2(attr->blksize);
867 blkbits = inode->i_sb->s_blocksize_bits;
869 stat->blksize = 1 << blkbits;
872 static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
876 struct fuse_getattr_in inarg;
877 struct fuse_attr_out outarg;
878 struct fuse_conn *fc = get_fuse_conn(inode);
882 attr_version = fuse_get_attr_version(fc);
884 memset(&inarg, 0, sizeof(inarg));
885 memset(&outarg, 0, sizeof(outarg));
886 /* Directories have separate file-handle space */
887 if (file && S_ISREG(inode->i_mode)) {
888 struct fuse_file *ff = file->private_data;
890 inarg.getattr_flags |= FUSE_GETATTR_FH;
893 args.in.h.opcode = FUSE_GETATTR;
894 args.in.h.nodeid = get_node_id(inode);
896 args.in.args[0].size = sizeof(inarg);
897 args.in.args[0].value = &inarg;
898 args.out.numargs = 1;
899 args.out.args[0].size = sizeof(outarg);
900 args.out.args[0].value = &outarg;
901 err = fuse_simple_request(fc, &args);
903 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
904 make_bad_inode(inode);
907 fuse_change_attributes(inode, &outarg.attr,
908 attr_timeout(&outarg),
911 fuse_fillattr(inode, &outarg.attr, stat);
917 int fuse_update_attributes(struct inode *inode, struct kstat *stat,
918 struct file *file, bool *refreshed)
920 struct fuse_inode *fi = get_fuse_inode(inode);
924 if (time_before64(fi->i_time, get_jiffies_64())) {
926 forget_all_cached_acls(inode);
927 err = fuse_do_getattr(inode, stat, file);
932 generic_fillattr(inode, stat);
933 stat->mode = fi->orig_i_mode;
934 stat->ino = fi->orig_ino;
938 if (refreshed != NULL)
944 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
945 u64 child_nodeid, struct qstr *name)
948 struct inode *parent;
950 struct dentry *entry;
952 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
957 if (!S_ISDIR(parent->i_mode))
961 dir = d_find_alias(parent);
965 name->hash = full_name_hash(dir, name->name, name->len);
966 entry = d_lookup(dir, name);
971 fuse_invalidate_attr(parent);
972 fuse_invalidate_entry(entry);
974 if (child_nodeid != 0 && d_really_is_positive(entry)) {
975 inode_lock(d_inode(entry));
976 if (get_node_id(d_inode(entry)) != child_nodeid) {
980 if (d_mountpoint(entry)) {
984 if (d_is_dir(entry)) {
985 shrink_dcache_parent(entry);
986 if (!simple_empty(entry)) {
990 d_inode(entry)->i_flags |= S_DEAD;
993 clear_nlink(d_inode(entry));
996 inode_unlock(d_inode(entry));
1005 inode_unlock(parent);
1011 * Calling into a user-controlled filesystem gives the filesystem
1012 * daemon ptrace-like capabilities over the current process. This
1013 * means, that the filesystem daemon is able to record the exact
1014 * filesystem operations performed, and can also control the behavior
1015 * of the requester process in otherwise impossible ways. For example
1016 * it can delay the operation for arbitrary length of time allowing
1017 * DoS against the requester.
1019 * For this reason only those processes can call into the filesystem,
1020 * for which the owner of the mount has ptrace privilege. This
1021 * excludes processes started by other users, suid or sgid processes.
1023 int fuse_allow_current_process(struct fuse_conn *fc)
1025 const struct cred *cred;
1027 if (fc->flags & FUSE_ALLOW_OTHER)
1030 cred = current_cred();
1031 if (uid_eq(cred->euid, fc->user_id) &&
1032 uid_eq(cred->suid, fc->user_id) &&
1033 uid_eq(cred->uid, fc->user_id) &&
1034 gid_eq(cred->egid, fc->group_id) &&
1035 gid_eq(cred->sgid, fc->group_id) &&
1036 gid_eq(cred->gid, fc->group_id))
1042 static int fuse_access(struct inode *inode, int mask)
1044 struct fuse_conn *fc = get_fuse_conn(inode);
1046 struct fuse_access_in inarg;
1049 BUG_ON(mask & MAY_NOT_BLOCK);
1054 memset(&inarg, 0, sizeof(inarg));
1055 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
1056 args.in.h.opcode = FUSE_ACCESS;
1057 args.in.h.nodeid = get_node_id(inode);
1058 args.in.numargs = 1;
1059 args.in.args[0].size = sizeof(inarg);
1060 args.in.args[0].value = &inarg;
1061 err = fuse_simple_request(fc, &args);
1062 if (err == -ENOSYS) {
1069 static int fuse_perm_getattr(struct inode *inode, int mask)
1071 if (mask & MAY_NOT_BLOCK)
1074 forget_all_cached_acls(inode);
1075 return fuse_do_getattr(inode, NULL, NULL);
1079 * Check permission. The two basic access models of FUSE are:
1081 * 1) Local access checking ('default_permissions' mount option) based
1082 * on file mode. This is the plain old disk filesystem permission
1085 * 2) "Remote" access checking, where server is responsible for
1086 * checking permission in each inode operation. An exception to this
1087 * is if ->permission() was invoked from sys_access() in which case an
1088 * access request is sent. Execute permission is still checked
1089 * locally based on file mode.
1091 static int fuse_permission(struct inode *inode, int mask)
1093 struct fuse_conn *fc = get_fuse_conn(inode);
1094 bool refreshed = false;
1097 if (!fuse_allow_current_process(fc))
1101 * If attributes are needed, refresh them before proceeding
1103 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
1104 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
1105 struct fuse_inode *fi = get_fuse_inode(inode);
1107 if (time_before64(fi->i_time, get_jiffies_64())) {
1110 err = fuse_perm_getattr(inode, mask);
1116 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
1117 err = generic_permission(inode, mask);
1119 /* If permission is denied, try to refresh file
1120 attributes. This is also needed, because the root
1121 node will at first have no permissions */
1122 if (err == -EACCES && !refreshed) {
1123 err = fuse_perm_getattr(inode, mask);
1125 err = generic_permission(inode, mask);
1128 /* Note: the opposite of the above test does not
1129 exist. So if permissions are revoked this won't be
1130 noticed immediately, only after the attribute
1131 timeout has expired */
1132 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
1133 err = fuse_access(inode, mask);
1134 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1135 if (!(inode->i_mode & S_IXUGO)) {
1139 err = fuse_perm_getattr(inode, mask);
1140 if (!err && !(inode->i_mode & S_IXUGO))
1147 static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
1148 struct dir_context *ctx)
1150 while (nbytes >= FUSE_NAME_OFFSET) {
1151 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1152 size_t reclen = FUSE_DIRENT_SIZE(dirent);
1153 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1155 if (reclen > nbytes)
1157 if (memchr(dirent->name, '/', dirent->namelen) != NULL)
1160 if (!dir_emit(ctx, dirent->name, dirent->namelen,
1161 dirent->ino, dirent->type))
1166 ctx->pos = dirent->off;
1172 static int fuse_direntplus_link(struct file *file,
1173 struct fuse_direntplus *direntplus,
1176 struct fuse_entry_out *o = &direntplus->entry_out;
1177 struct fuse_dirent *dirent = &direntplus->dirent;
1178 struct dentry *parent = file->f_path.dentry;
1179 struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
1180 struct dentry *dentry;
1181 struct dentry *alias;
1182 struct inode *dir = d_inode(parent);
1183 struct fuse_conn *fc;
1184 struct inode *inode;
1185 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
1189 * Unlike in the case of fuse_lookup, zero nodeid does not mean
1190 * ENOENT. Instead, it only means the userspace filesystem did
1191 * not want to return attributes/handle for this entry.
1198 if (name.name[0] == '.') {
1200 * We could potentially refresh the attributes of the directory
1205 if (name.name[1] == '.' && name.len == 2)
1209 if (invalid_nodeid(o->nodeid))
1211 if (!fuse_valid_type(o->attr.mode))
1214 fc = get_fuse_conn(dir);
1216 name.hash = full_name_hash(parent, name.name, name.len);
1217 dentry = d_lookup(parent, &name);
1220 dentry = d_alloc_parallel(parent, &name, &wq);
1222 return PTR_ERR(dentry);
1224 if (!d_in_lookup(dentry)) {
1225 struct fuse_inode *fi;
1226 inode = d_inode(dentry);
1228 get_node_id(inode) != o->nodeid ||
1229 ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
1230 d_invalidate(dentry);
1234 if (is_bad_inode(inode)) {
1239 fi = get_fuse_inode(inode);
1240 spin_lock(&fc->lock);
1242 spin_unlock(&fc->lock);
1244 forget_all_cached_acls(inode);
1245 fuse_change_attributes(inode, &o->attr,
1246 entry_attr_timeout(o),
1249 * The other branch comes via fuse_iget()
1250 * which bumps nlookup inside
1253 inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
1254 &o->attr, entry_attr_timeout(o),
1257 inode = ERR_PTR(-ENOMEM);
1259 alias = d_splice_alias(inode, dentry);
1260 d_lookup_done(dentry);
1266 return PTR_ERR(dentry);
1268 if (fc->readdirplus_auto)
1269 set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
1270 fuse_change_entry_timeout(dentry, o);
1276 static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
1277 struct dir_context *ctx, u64 attr_version)
1279 struct fuse_direntplus *direntplus;
1280 struct fuse_dirent *dirent;
1285 while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
1286 direntplus = (struct fuse_direntplus *) buf;
1287 dirent = &direntplus->dirent;
1288 reclen = FUSE_DIRENTPLUS_SIZE(direntplus);
1290 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1292 if (reclen > nbytes)
1294 if (memchr(dirent->name, '/', dirent->namelen) != NULL)
1298 /* We fill entries into dstbuf only as much as
1299 it can hold. But we still continue iterating
1300 over remaining entries to link them. If not,
1301 we need to send a FORGET for each of those
1302 which we did not link.
1304 over = !dir_emit(ctx, dirent->name, dirent->namelen,
1305 dirent->ino, dirent->type);
1306 ctx->pos = dirent->off;
1312 ret = fuse_direntplus_link(file, direntplus, attr_version);
1314 fuse_force_forget(file, direntplus->entry_out.nodeid);
1320 static int fuse_readdir(struct file *file, struct dir_context *ctx)
1325 struct inode *inode = file_inode(file);
1326 struct fuse_conn *fc = get_fuse_conn(inode);
1327 struct fuse_req *req;
1328 u64 attr_version = 0;
1330 if (is_bad_inode(inode))
1333 req = fuse_get_req(fc, 1);
1335 return PTR_ERR(req);
1337 page = alloc_page(GFP_KERNEL);
1339 fuse_put_request(fc, req);
1343 plus = fuse_use_readdirplus(inode, ctx);
1344 req->out.argpages = 1;
1346 req->pages[0] = page;
1347 req->page_descs[0].length = PAGE_SIZE;
1349 attr_version = fuse_get_attr_version(fc);
1350 fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
1353 fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
1356 fuse_lock_inode(inode);
1357 fuse_request_send(fc, req);
1358 fuse_unlock_inode(inode);
1359 nbytes = req->out.args[0].size;
1360 err = req->out.h.error;
1361 fuse_put_request(fc, req);
1364 err = parse_dirplusfile(page_address(page), nbytes,
1368 err = parse_dirfile(page_address(page), nbytes, file,
1374 fuse_invalidate_atime(inode);
1378 static const char *fuse_get_link(struct dentry *dentry,
1379 struct inode *inode,
1380 struct delayed_call *done)
1382 struct fuse_conn *fc = get_fuse_conn(inode);
1388 return ERR_PTR(-ECHILD);
1390 link = kmalloc(PAGE_SIZE, GFP_KERNEL);
1392 return ERR_PTR(-ENOMEM);
1394 args.in.h.opcode = FUSE_READLINK;
1395 args.in.h.nodeid = get_node_id(inode);
1396 args.out.argvar = 1;
1397 args.out.numargs = 1;
1398 args.out.args[0].size = PAGE_SIZE - 1;
1399 args.out.args[0].value = link;
1400 ret = fuse_simple_request(fc, &args);
1403 link = ERR_PTR(ret);
1406 set_delayed_call(done, kfree_link, link);
1408 fuse_invalidate_atime(inode);
1412 static int fuse_dir_open(struct inode *inode, struct file *file)
1414 return fuse_open_common(inode, file, true);
1417 static int fuse_dir_release(struct inode *inode, struct file *file)
1419 fuse_release_common(file, FUSE_RELEASEDIR);
1424 static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
1427 return fuse_fsync_common(file, start, end, datasync, 1);
1430 static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
1433 struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
1435 /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
1439 return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR);
1442 static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
1445 struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
1450 return fuse_ioctl_common(file, cmd, arg,
1451 FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
1454 static bool update_mtime(unsigned ivalid, bool trust_local_mtime)
1456 /* Always update if mtime is explicitly set */
1457 if (ivalid & ATTR_MTIME_SET)
1460 /* Or if kernel i_mtime is the official one */
1461 if (trust_local_mtime)
1464 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1465 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1468 /* In all other cases update */
1472 static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg,
1473 bool trust_local_cmtime)
1475 unsigned ivalid = iattr->ia_valid;
1477 if (ivalid & ATTR_MODE)
1478 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
1479 if (ivalid & ATTR_UID)
1480 arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid);
1481 if (ivalid & ATTR_GID)
1482 arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid);
1483 if (ivalid & ATTR_SIZE)
1484 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
1485 if (ivalid & ATTR_ATIME) {
1486 arg->valid |= FATTR_ATIME;
1487 arg->atime = iattr->ia_atime.tv_sec;
1488 arg->atimensec = iattr->ia_atime.tv_nsec;
1489 if (!(ivalid & ATTR_ATIME_SET))
1490 arg->valid |= FATTR_ATIME_NOW;
1492 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) {
1493 arg->valid |= FATTR_MTIME;
1494 arg->mtime = iattr->ia_mtime.tv_sec;
1495 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1496 if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime)
1497 arg->valid |= FATTR_MTIME_NOW;
1499 if ((ivalid & ATTR_CTIME) && trust_local_cmtime) {
1500 arg->valid |= FATTR_CTIME;
1501 arg->ctime = iattr->ia_ctime.tv_sec;
1502 arg->ctimensec = iattr->ia_ctime.tv_nsec;
1507 * Prevent concurrent writepages on inode
1509 * This is done by adding a negative bias to the inode write counter
1510 * and waiting for all pending writes to finish.
1512 void fuse_set_nowrite(struct inode *inode)
1514 struct fuse_conn *fc = get_fuse_conn(inode);
1515 struct fuse_inode *fi = get_fuse_inode(inode);
1517 BUG_ON(!inode_is_locked(inode));
1519 spin_lock(&fc->lock);
1520 BUG_ON(fi->writectr < 0);
1521 fi->writectr += FUSE_NOWRITE;
1522 spin_unlock(&fc->lock);
1523 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1527 * Allow writepages on inode
1529 * Remove the bias from the writecounter and send any queued
1532 static void __fuse_release_nowrite(struct inode *inode)
1534 struct fuse_inode *fi = get_fuse_inode(inode);
1536 BUG_ON(fi->writectr != FUSE_NOWRITE);
1538 fuse_flush_writepages(inode);
1541 void fuse_release_nowrite(struct inode *inode)
1543 struct fuse_conn *fc = get_fuse_conn(inode);
1545 spin_lock(&fc->lock);
1546 __fuse_release_nowrite(inode);
1547 spin_unlock(&fc->lock);
1550 static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args,
1551 struct inode *inode,
1552 struct fuse_setattr_in *inarg_p,
1553 struct fuse_attr_out *outarg_p)
1555 args->in.h.opcode = FUSE_SETATTR;
1556 args->in.h.nodeid = get_node_id(inode);
1557 args->in.numargs = 1;
1558 args->in.args[0].size = sizeof(*inarg_p);
1559 args->in.args[0].value = inarg_p;
1560 args->out.numargs = 1;
1561 args->out.args[0].size = sizeof(*outarg_p);
1562 args->out.args[0].value = outarg_p;
1566 * Flush inode->i_mtime to the server
1568 int fuse_flush_times(struct inode *inode, struct fuse_file *ff)
1570 struct fuse_conn *fc = get_fuse_conn(inode);
1572 struct fuse_setattr_in inarg;
1573 struct fuse_attr_out outarg;
1575 memset(&inarg, 0, sizeof(inarg));
1576 memset(&outarg, 0, sizeof(outarg));
1578 inarg.valid = FATTR_MTIME;
1579 inarg.mtime = inode->i_mtime.tv_sec;
1580 inarg.mtimensec = inode->i_mtime.tv_nsec;
1581 if (fc->minor >= 23) {
1582 inarg.valid |= FATTR_CTIME;
1583 inarg.ctime = inode->i_ctime.tv_sec;
1584 inarg.ctimensec = inode->i_ctime.tv_nsec;
1587 inarg.valid |= FATTR_FH;
1590 fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
1592 return fuse_simple_request(fc, &args);
1596 * Set attributes, and at the same time refresh them.
1598 * Truncation is slightly complicated, because the 'truncate' request
1599 * may fail, in which case we don't want to touch the mapping.
1600 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1601 * and the actual truncation by hand.
1603 int fuse_do_setattr(struct inode *inode, struct iattr *attr,
1606 struct fuse_conn *fc = get_fuse_conn(inode);
1607 struct fuse_inode *fi = get_fuse_inode(inode);
1609 struct fuse_setattr_in inarg;
1610 struct fuse_attr_out outarg;
1611 bool is_truncate = false;
1612 bool is_wb = fc->writeback_cache;
1615 bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode);
1617 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1618 attr->ia_valid |= ATTR_FORCE;
1620 err = inode_change_ok(inode, attr);
1624 if (attr->ia_valid & ATTR_OPEN) {
1625 if (fc->atomic_o_trunc)
1630 if (attr->ia_valid & ATTR_SIZE)
1634 fuse_set_nowrite(inode);
1635 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
1636 if (trust_local_cmtime && attr->ia_size != inode->i_size)
1637 attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
1640 memset(&inarg, 0, sizeof(inarg));
1641 memset(&outarg, 0, sizeof(outarg));
1642 iattr_to_fattr(attr, &inarg, trust_local_cmtime);
1644 struct fuse_file *ff = file->private_data;
1645 inarg.valid |= FATTR_FH;
1648 if (attr->ia_valid & ATTR_SIZE) {
1649 /* For mandatory locking in truncate */
1650 inarg.valid |= FATTR_LOCKOWNER;
1651 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1653 fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
1654 err = fuse_simple_request(fc, &args);
1657 fuse_invalidate_attr(inode);
1661 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1662 make_bad_inode(inode);
1667 spin_lock(&fc->lock);
1668 /* the kernel maintains i_mtime locally */
1669 if (trust_local_cmtime) {
1670 if (attr->ia_valid & ATTR_MTIME)
1671 inode->i_mtime = attr->ia_mtime;
1672 if (attr->ia_valid & ATTR_CTIME)
1673 inode->i_ctime = attr->ia_ctime;
1674 /* FIXME: clear I_DIRTY_SYNC? */
1677 fuse_change_attributes_common(inode, &outarg.attr,
1678 attr_timeout(&outarg));
1679 oldsize = inode->i_size;
1680 /* see the comment in fuse_change_attributes() */
1681 if (!is_wb || is_truncate || !S_ISREG(inode->i_mode))
1682 i_size_write(inode, outarg.attr.size);
1685 /* NOTE: this may release/reacquire fc->lock */
1686 __fuse_release_nowrite(inode);
1688 spin_unlock(&fc->lock);
1691 * Only call invalidate_inode_pages2() after removing
1692 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1694 if ((is_truncate || !is_wb) &&
1695 S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
1696 truncate_pagecache(inode, outarg.attr.size);
1697 invalidate_inode_pages2(inode->i_mapping);
1700 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
1705 fuse_release_nowrite(inode);
1707 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
1711 static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1713 struct inode *inode = d_inode(entry);
1714 struct fuse_conn *fc = get_fuse_conn(inode);
1715 struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL;
1718 if (!fuse_allow_current_process(get_fuse_conn(inode)))
1721 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) {
1722 attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID |
1726 * The only sane way to reliably kill suid/sgid is to do it in
1727 * the userspace filesystem
1729 * This should be done on write(), truncate() and chown().
1731 if (!fc->handle_killpriv) {
1735 * ia_mode calculation may have used stale i_mode.
1736 * Refresh and recalculate.
1738 ret = fuse_do_getattr(inode, NULL, file);
1742 attr->ia_mode = inode->i_mode;
1743 kill = should_remove_suid(entry);
1744 if (kill & ATTR_KILL_SUID) {
1745 attr->ia_valid |= ATTR_MODE;
1746 attr->ia_mode &= ~S_ISUID;
1748 if (kill & ATTR_KILL_SGID) {
1749 attr->ia_valid |= ATTR_MODE;
1750 attr->ia_mode &= ~S_ISGID;
1754 if (!attr->ia_valid)
1757 ret = fuse_do_setattr(inode, attr, file);
1760 * If filesystem supports acls it may have updated acl xattrs in
1761 * the filesystem, so forget cached acls for the inode.
1764 forget_all_cached_acls(inode);
1766 /* Directory mode changed, may need to revalidate access */
1767 if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE))
1768 fuse_invalidate_entry_cache(entry);
1773 static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1776 struct inode *inode = d_inode(entry);
1777 struct fuse_conn *fc = get_fuse_conn(inode);
1779 if (!fuse_allow_current_process(fc))
1782 return fuse_update_attributes(inode, stat, NULL, NULL);
1785 static const struct inode_operations fuse_dir_inode_operations = {
1786 .lookup = fuse_lookup,
1787 .mkdir = fuse_mkdir,
1788 .symlink = fuse_symlink,
1789 .unlink = fuse_unlink,
1790 .rmdir = fuse_rmdir,
1791 .rename2 = fuse_rename2,
1793 .setattr = fuse_setattr,
1794 .create = fuse_create,
1795 .atomic_open = fuse_atomic_open,
1796 .mknod = fuse_mknod,
1797 .permission = fuse_permission,
1798 .getattr = fuse_getattr,
1799 .setxattr = generic_setxattr,
1800 .getxattr = generic_getxattr,
1801 .listxattr = fuse_listxattr,
1802 .removexattr = generic_removexattr,
1803 .get_acl = fuse_get_acl,
1804 .set_acl = fuse_set_acl,
1807 static const struct file_operations fuse_dir_operations = {
1808 .llseek = generic_file_llseek,
1809 .read = generic_read_dir,
1810 .iterate_shared = fuse_readdir,
1811 .open = fuse_dir_open,
1812 .release = fuse_dir_release,
1813 .fsync = fuse_dir_fsync,
1814 .unlocked_ioctl = fuse_dir_ioctl,
1815 .compat_ioctl = fuse_dir_compat_ioctl,
1818 static const struct inode_operations fuse_common_inode_operations = {
1819 .setattr = fuse_setattr,
1820 .permission = fuse_permission,
1821 .getattr = fuse_getattr,
1822 .setxattr = generic_setxattr,
1823 .getxattr = generic_getxattr,
1824 .listxattr = fuse_listxattr,
1825 .removexattr = generic_removexattr,
1826 .get_acl = fuse_get_acl,
1827 .set_acl = fuse_set_acl,
1830 static const struct inode_operations fuse_symlink_inode_operations = {
1831 .setattr = fuse_setattr,
1832 .get_link = fuse_get_link,
1833 .readlink = generic_readlink,
1834 .getattr = fuse_getattr,
1835 .setxattr = generic_setxattr,
1836 .getxattr = generic_getxattr,
1837 .listxattr = fuse_listxattr,
1838 .removexattr = generic_removexattr,
1841 void fuse_init_common(struct inode *inode)
1843 inode->i_op = &fuse_common_inode_operations;
1846 void fuse_init_dir(struct inode *inode)
1848 inode->i_op = &fuse_dir_inode_operations;
1849 inode->i_fop = &fuse_dir_operations;
1852 void fuse_init_symlink(struct inode *inode)
1854 inode->i_op = &fuse_symlink_inode_operations;