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 * 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_req *req,
139 u64 nodeid, struct qstr *name,
140 struct fuse_entry_out *outarg)
142 memset(outarg, 0, sizeof(struct fuse_entry_out));
143 req->in.h.opcode = FUSE_LOOKUP;
144 req->in.h.nodeid = nodeid;
146 req->in.args[0].size = name->len + 1;
147 req->in.args[0].value = name->name;
148 req->out.numargs = 1;
150 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
152 req->out.args[0].size = sizeof(struct fuse_entry_out);
153 req->out.args[0].value = outarg;
156 u64 fuse_get_attr_version(struct fuse_conn *fc)
161 * The spin lock isn't actually needed on 64bit archs, but we
162 * don't yet care too much about such optimizations.
164 spin_lock(&fc->lock);
165 curr_version = fc->attr_version;
166 spin_unlock(&fc->lock);
172 * Check whether the dentry is still valid
174 * If the entry validity timeout has expired and the dentry is
175 * positive, try to redo the lookup. If the lookup results in a
176 * different inode, then let the VFS invalidate the dentry and redo
177 * the lookup once more. If the lookup results in the same inode,
178 * then refresh the attributes, timeouts and mark the dentry valid.
180 static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
183 struct dentry *parent;
184 struct fuse_conn *fc;
187 inode = ACCESS_ONCE(entry->d_inode);
188 if (inode && is_bad_inode(inode))
190 else if (fuse_dentry_time(entry) < get_jiffies_64()) {
192 struct fuse_entry_out outarg;
193 struct fuse_req *req;
194 struct fuse_forget_link *forget;
197 /* For negative dentries, always do a fresh lookup */
202 if (flags & LOOKUP_RCU)
205 fc = get_fuse_conn(inode);
206 req = fuse_get_req_nopages(fc);
211 forget = fuse_alloc_forget();
213 fuse_put_request(fc, req);
218 attr_version = fuse_get_attr_version(fc);
220 parent = dget_parent(entry);
221 fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
222 &entry->d_name, &outarg);
223 fuse_request_send(fc, req);
225 err = req->out.h.error;
226 fuse_put_request(fc, req);
227 /* Zero nodeid is same as -ENOENT */
228 if (!err && !outarg.nodeid)
231 struct fuse_inode *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);
241 if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
244 fuse_change_attributes(inode, &outarg.attr,
245 entry_attr_timeout(&outarg),
247 fuse_change_entry_timeout(entry, &outarg);
249 fc = get_fuse_conn(inode);
250 if (fc->readdirplus_auto) {
251 parent = dget_parent(entry);
252 fuse_advise_use_readdirplus(parent->d_inode);
262 if (check_submounts_and_drop(entry) != 0)
267 static int invalid_nodeid(u64 nodeid)
269 return !nodeid || nodeid == FUSE_ROOT_ID;
272 const struct dentry_operations fuse_dentry_operations = {
273 .d_revalidate = fuse_dentry_revalidate,
276 int fuse_valid_type(int m)
278 return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
279 S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
282 int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
283 struct fuse_entry_out *outarg, struct inode **inode)
285 struct fuse_conn *fc = get_fuse_conn_super(sb);
286 struct fuse_req *req;
287 struct fuse_forget_link *forget;
293 if (name->len > FUSE_NAME_MAX)
296 req = fuse_get_req_nopages(fc);
301 forget = fuse_alloc_forget();
304 fuse_put_request(fc, req);
308 attr_version = fuse_get_attr_version(fc);
310 fuse_lookup_init(fc, req, nodeid, name, outarg);
311 fuse_request_send(fc, req);
312 err = req->out.h.error;
313 fuse_put_request(fc, req);
314 /* Zero nodeid is same as -ENOENT, but with valid timeout */
315 if (err || !outarg->nodeid)
321 if (!fuse_valid_type(outarg->attr.mode))
324 *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
325 &outarg->attr, entry_attr_timeout(outarg),
329 fuse_queue_forget(fc, forget, outarg->nodeid, 1);
340 static struct dentry *fuse_materialise_dentry(struct dentry *dentry,
343 struct dentry *newent;
345 if (inode && S_ISDIR(inode->i_mode)) {
346 struct fuse_conn *fc = get_fuse_conn(inode);
348 mutex_lock(&fc->inst_mutex);
349 newent = d_materialise_unique(dentry, inode);
350 mutex_unlock(&fc->inst_mutex);
352 newent = d_materialise_unique(dentry, inode);
358 static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
362 struct fuse_entry_out outarg;
364 struct dentry *newent;
365 bool outarg_valid = true;
367 err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
369 if (err == -ENOENT) {
370 outarg_valid = false;
377 if (inode && get_node_id(inode) == FUSE_ROOT_ID)
380 newent = fuse_materialise_dentry(entry, inode);
381 err = PTR_ERR(newent);
385 entry = newent ? newent : entry;
387 fuse_change_entry_timeout(entry, &outarg);
389 fuse_invalidate_entry_cache(entry);
391 fuse_advise_use_readdirplus(dir);
401 * Atomic create+open operation
403 * If the filesystem doesn't support this, then fall back to separate
404 * 'mknod' + 'open' requests.
406 static int fuse_create_open(struct inode *dir, struct dentry *entry,
407 struct file *file, unsigned flags,
408 umode_t mode, int *opened)
412 struct fuse_conn *fc = get_fuse_conn(dir);
413 struct fuse_req *req;
414 struct fuse_forget_link *forget;
415 struct fuse_create_in inarg;
416 struct fuse_open_out outopen;
417 struct fuse_entry_out outentry;
418 struct fuse_file *ff;
420 /* Userspace expects S_IFREG in create mode */
421 BUG_ON((mode & S_IFMT) != S_IFREG);
423 forget = fuse_alloc_forget();
428 req = fuse_get_req_nopages(fc);
431 goto out_put_forget_req;
434 ff = fuse_file_alloc(fc);
436 goto out_put_request;
439 mode &= ~current_umask();
442 memset(&inarg, 0, sizeof(inarg));
443 memset(&outentry, 0, sizeof(outentry));
446 inarg.umask = current_umask();
447 req->in.h.opcode = FUSE_CREATE;
448 req->in.h.nodeid = get_node_id(dir);
450 req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
452 req->in.args[0].value = &inarg;
453 req->in.args[1].size = entry->d_name.len + 1;
454 req->in.args[1].value = entry->d_name.name;
455 req->out.numargs = 2;
457 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
459 req->out.args[0].size = sizeof(outentry);
460 req->out.args[0].value = &outentry;
461 req->out.args[1].size = sizeof(outopen);
462 req->out.args[1].value = &outopen;
463 fuse_request_send(fc, req);
464 err = req->out.h.error;
469 if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
472 fuse_put_request(fc, req);
474 ff->nodeid = outentry.nodeid;
475 ff->open_flags = outopen.open_flags;
476 inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
477 &outentry.attr, entry_attr_timeout(&outentry), 0);
479 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
480 fuse_sync_release(ff, flags);
481 fuse_queue_forget(fc, forget, outentry.nodeid, 1);
486 d_instantiate(entry, inode);
487 fuse_change_entry_timeout(entry, &outentry);
488 fuse_invalidate_attr(dir);
489 err = finish_open(file, entry, generic_file_open, opened);
491 fuse_sync_release(ff, flags);
493 file->private_data = fuse_file_get(ff);
494 fuse_finish_open(inode, file);
501 fuse_put_request(fc, req);
508 static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);
509 static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
510 struct file *file, unsigned flags,
511 umode_t mode, int *opened)
514 struct fuse_conn *fc = get_fuse_conn(dir);
515 struct dentry *res = NULL;
517 if (d_unhashed(entry)) {
518 res = fuse_lookup(dir, entry, 0);
526 if (!(flags & O_CREAT) || entry->d_inode)
530 *opened |= FILE_CREATED;
535 err = fuse_create_open(dir, entry, file, flags, mode, opened);
536 if (err == -ENOSYS) {
545 err = fuse_mknod(dir, entry, mode, 0);
549 return finish_no_open(file, res);
553 * Code shared between mknod, mkdir, symlink and link
555 static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
556 struct inode *dir, struct dentry *entry,
559 struct fuse_entry_out outarg;
562 struct fuse_forget_link *forget;
564 forget = fuse_alloc_forget();
566 fuse_put_request(fc, req);
570 memset(&outarg, 0, sizeof(outarg));
571 req->in.h.nodeid = get_node_id(dir);
572 req->out.numargs = 1;
574 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
576 req->out.args[0].size = sizeof(outarg);
577 req->out.args[0].value = &outarg;
578 fuse_request_send(fc, req);
579 err = req->out.h.error;
580 fuse_put_request(fc, req);
582 goto out_put_forget_req;
585 if (invalid_nodeid(outarg.nodeid))
586 goto out_put_forget_req;
588 if ((outarg.attr.mode ^ mode) & S_IFMT)
589 goto out_put_forget_req;
591 inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
592 &outarg.attr, entry_attr_timeout(&outarg), 0);
594 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
599 if (S_ISDIR(inode->i_mode)) {
600 struct dentry *alias;
601 mutex_lock(&fc->inst_mutex);
602 alias = d_find_alias(inode);
604 /* New directory must have moved since mkdir */
605 mutex_unlock(&fc->inst_mutex);
610 d_instantiate(entry, inode);
611 mutex_unlock(&fc->inst_mutex);
613 d_instantiate(entry, inode);
615 fuse_change_entry_timeout(entry, &outarg);
616 fuse_invalidate_attr(dir);
624 static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
627 struct fuse_mknod_in inarg;
628 struct fuse_conn *fc = get_fuse_conn(dir);
629 struct fuse_req *req = fuse_get_req_nopages(fc);
634 mode &= ~current_umask();
636 memset(&inarg, 0, sizeof(inarg));
638 inarg.rdev = new_encode_dev(rdev);
639 inarg.umask = current_umask();
640 req->in.h.opcode = FUSE_MKNOD;
642 req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
644 req->in.args[0].value = &inarg;
645 req->in.args[1].size = entry->d_name.len + 1;
646 req->in.args[1].value = entry->d_name.name;
647 return create_new_entry(fc, req, dir, entry, mode);
650 static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
653 return fuse_mknod(dir, entry, mode, 0);
656 static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
658 struct fuse_mkdir_in inarg;
659 struct fuse_conn *fc = get_fuse_conn(dir);
660 struct fuse_req *req = fuse_get_req_nopages(fc);
665 mode &= ~current_umask();
667 memset(&inarg, 0, sizeof(inarg));
669 inarg.umask = current_umask();
670 req->in.h.opcode = FUSE_MKDIR;
672 req->in.args[0].size = sizeof(inarg);
673 req->in.args[0].value = &inarg;
674 req->in.args[1].size = entry->d_name.len + 1;
675 req->in.args[1].value = entry->d_name.name;
676 return create_new_entry(fc, req, dir, entry, S_IFDIR);
679 static int fuse_symlink(struct inode *dir, struct dentry *entry,
682 struct fuse_conn *fc = get_fuse_conn(dir);
683 unsigned len = strlen(link) + 1;
684 struct fuse_req *req = fuse_get_req_nopages(fc);
688 req->in.h.opcode = FUSE_SYMLINK;
690 req->in.args[0].size = entry->d_name.len + 1;
691 req->in.args[0].value = entry->d_name.name;
692 req->in.args[1].size = len;
693 req->in.args[1].value = link;
694 return create_new_entry(fc, req, dir, entry, S_IFLNK);
697 static int fuse_unlink(struct inode *dir, struct dentry *entry)
700 struct fuse_conn *fc = get_fuse_conn(dir);
701 struct fuse_req *req = fuse_get_req_nopages(fc);
705 req->in.h.opcode = FUSE_UNLINK;
706 req->in.h.nodeid = get_node_id(dir);
708 req->in.args[0].size = entry->d_name.len + 1;
709 req->in.args[0].value = entry->d_name.name;
710 fuse_request_send(fc, req);
711 err = req->out.h.error;
712 fuse_put_request(fc, req);
714 struct inode *inode = entry->d_inode;
715 struct fuse_inode *fi = get_fuse_inode(inode);
717 spin_lock(&fc->lock);
718 fi->attr_version = ++fc->attr_version;
720 * If i_nlink == 0 then unlink doesn't make sense, yet this can
721 * happen if userspace filesystem is careless. It would be
722 * difficult to enforce correct nlink usage so just ignore this
725 if (inode->i_nlink > 0)
727 spin_unlock(&fc->lock);
728 fuse_invalidate_attr(inode);
729 fuse_invalidate_attr(dir);
730 fuse_invalidate_entry_cache(entry);
731 } else if (err == -EINTR)
732 fuse_invalidate_entry(entry);
736 static int fuse_rmdir(struct inode *dir, struct dentry *entry)
739 struct fuse_conn *fc = get_fuse_conn(dir);
740 struct fuse_req *req = fuse_get_req_nopages(fc);
744 req->in.h.opcode = FUSE_RMDIR;
745 req->in.h.nodeid = get_node_id(dir);
747 req->in.args[0].size = entry->d_name.len + 1;
748 req->in.args[0].value = entry->d_name.name;
749 fuse_request_send(fc, req);
750 err = req->out.h.error;
751 fuse_put_request(fc, req);
753 clear_nlink(entry->d_inode);
754 fuse_invalidate_attr(dir);
755 fuse_invalidate_entry_cache(entry);
756 } else if (err == -EINTR)
757 fuse_invalidate_entry(entry);
761 static int fuse_rename(struct inode *olddir, struct dentry *oldent,
762 struct inode *newdir, struct dentry *newent)
765 struct fuse_rename_in inarg;
766 struct fuse_conn *fc = get_fuse_conn(olddir);
767 struct fuse_req *req = fuse_get_req_nopages(fc);
772 memset(&inarg, 0, sizeof(inarg));
773 inarg.newdir = get_node_id(newdir);
774 req->in.h.opcode = FUSE_RENAME;
775 req->in.h.nodeid = get_node_id(olddir);
777 req->in.args[0].size = sizeof(inarg);
778 req->in.args[0].value = &inarg;
779 req->in.args[1].size = oldent->d_name.len + 1;
780 req->in.args[1].value = oldent->d_name.name;
781 req->in.args[2].size = newent->d_name.len + 1;
782 req->in.args[2].value = newent->d_name.name;
783 fuse_request_send(fc, req);
784 err = req->out.h.error;
785 fuse_put_request(fc, req);
788 fuse_invalidate_attr(oldent->d_inode);
790 fuse_invalidate_attr(olddir);
791 if (olddir != newdir)
792 fuse_invalidate_attr(newdir);
794 /* newent will end up negative */
795 if (newent->d_inode) {
796 fuse_invalidate_attr(newent->d_inode);
797 fuse_invalidate_entry_cache(newent);
799 } else if (err == -EINTR) {
800 /* If request was interrupted, DEITY only knows if the
801 rename actually took place. If the invalidation
802 fails (e.g. some process has CWD under the renamed
803 directory), then there can be inconsistency between
804 the dcache and the real filesystem. Tough luck. */
805 fuse_invalidate_entry(oldent);
807 fuse_invalidate_entry(newent);
813 static int fuse_link(struct dentry *entry, struct inode *newdir,
814 struct dentry *newent)
817 struct fuse_link_in inarg;
818 struct inode *inode = entry->d_inode;
819 struct fuse_conn *fc = get_fuse_conn(inode);
820 struct fuse_req *req = fuse_get_req_nopages(fc);
824 memset(&inarg, 0, sizeof(inarg));
825 inarg.oldnodeid = get_node_id(inode);
826 req->in.h.opcode = FUSE_LINK;
828 req->in.args[0].size = sizeof(inarg);
829 req->in.args[0].value = &inarg;
830 req->in.args[1].size = newent->d_name.len + 1;
831 req->in.args[1].value = newent->d_name.name;
832 err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
833 /* Contrary to "normal" filesystems it can happen that link
834 makes two "logical" inodes point to the same "physical"
835 inode. We invalidate the attributes of the old one, so it
836 will reflect changes in the backing inode (link count,
840 struct fuse_inode *fi = get_fuse_inode(inode);
842 spin_lock(&fc->lock);
843 fi->attr_version = ++fc->attr_version;
845 spin_unlock(&fc->lock);
846 fuse_invalidate_attr(inode);
847 } else if (err == -EINTR) {
848 fuse_invalidate_attr(inode);
853 static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
856 unsigned int blkbits;
858 stat->dev = inode->i_sb->s_dev;
859 stat->ino = attr->ino;
860 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
861 stat->nlink = attr->nlink;
862 stat->uid = make_kuid(&init_user_ns, attr->uid);
863 stat->gid = make_kgid(&init_user_ns, attr->gid);
864 stat->rdev = inode->i_rdev;
865 stat->atime.tv_sec = attr->atime;
866 stat->atime.tv_nsec = attr->atimensec;
867 stat->mtime.tv_sec = attr->mtime;
868 stat->mtime.tv_nsec = attr->mtimensec;
869 stat->ctime.tv_sec = attr->ctime;
870 stat->ctime.tv_nsec = attr->ctimensec;
871 stat->size = attr->size;
872 stat->blocks = attr->blocks;
874 if (attr->blksize != 0)
875 blkbits = ilog2(attr->blksize);
877 blkbits = inode->i_sb->s_blocksize_bits;
879 stat->blksize = 1 << blkbits;
882 static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
886 struct fuse_getattr_in inarg;
887 struct fuse_attr_out outarg;
888 struct fuse_conn *fc = get_fuse_conn(inode);
889 struct fuse_req *req;
892 req = fuse_get_req_nopages(fc);
896 attr_version = fuse_get_attr_version(fc);
898 memset(&inarg, 0, sizeof(inarg));
899 memset(&outarg, 0, sizeof(outarg));
900 /* Directories have separate file-handle space */
901 if (file && S_ISREG(inode->i_mode)) {
902 struct fuse_file *ff = file->private_data;
904 inarg.getattr_flags |= FUSE_GETATTR_FH;
907 req->in.h.opcode = FUSE_GETATTR;
908 req->in.h.nodeid = get_node_id(inode);
910 req->in.args[0].size = sizeof(inarg);
911 req->in.args[0].value = &inarg;
912 req->out.numargs = 1;
914 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
916 req->out.args[0].size = sizeof(outarg);
917 req->out.args[0].value = &outarg;
918 fuse_request_send(fc, req);
919 err = req->out.h.error;
920 fuse_put_request(fc, req);
922 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
923 make_bad_inode(inode);
926 fuse_change_attributes(inode, &outarg.attr,
927 attr_timeout(&outarg),
930 fuse_fillattr(inode, &outarg.attr, stat);
936 int fuse_update_attributes(struct inode *inode, struct kstat *stat,
937 struct file *file, bool *refreshed)
939 struct fuse_inode *fi = get_fuse_inode(inode);
943 if (fi->i_time < get_jiffies_64()) {
945 err = fuse_do_getattr(inode, stat, file);
950 generic_fillattr(inode, stat);
951 stat->mode = fi->orig_i_mode;
952 stat->ino = fi->orig_ino;
956 if (refreshed != NULL)
962 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
963 u64 child_nodeid, struct qstr *name)
966 struct inode *parent;
968 struct dentry *entry;
970 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
974 mutex_lock(&parent->i_mutex);
975 if (!S_ISDIR(parent->i_mode))
979 dir = d_find_alias(parent);
983 entry = d_lookup(dir, name);
988 fuse_invalidate_attr(parent);
989 fuse_invalidate_entry(entry);
991 if (child_nodeid != 0 && entry->d_inode) {
992 mutex_lock(&entry->d_inode->i_mutex);
993 if (get_node_id(entry->d_inode) != child_nodeid) {
997 if (d_mountpoint(entry)) {
1001 if (S_ISDIR(entry->d_inode->i_mode)) {
1002 shrink_dcache_parent(entry);
1003 if (!simple_empty(entry)) {
1007 entry->d_inode->i_flags |= S_DEAD;
1010 clear_nlink(entry->d_inode);
1013 mutex_unlock(&entry->d_inode->i_mutex);
1022 mutex_unlock(&parent->i_mutex);
1028 * Calling into a user-controlled filesystem gives the filesystem
1029 * daemon ptrace-like capabilities over the current process. This
1030 * means, that the filesystem daemon is able to record the exact
1031 * filesystem operations performed, and can also control the behavior
1032 * of the requester process in otherwise impossible ways. For example
1033 * it can delay the operation for arbitrary length of time allowing
1034 * DoS against the requester.
1036 * For this reason only those processes can call into the filesystem,
1037 * for which the owner of the mount has ptrace privilege. This
1038 * excludes processes started by other users, suid or sgid processes.
1040 int fuse_allow_current_process(struct fuse_conn *fc)
1042 const struct cred *cred;
1044 if (fc->flags & FUSE_ALLOW_OTHER)
1047 cred = current_cred();
1048 if (uid_eq(cred->euid, fc->user_id) &&
1049 uid_eq(cred->suid, fc->user_id) &&
1050 uid_eq(cred->uid, fc->user_id) &&
1051 gid_eq(cred->egid, fc->group_id) &&
1052 gid_eq(cred->sgid, fc->group_id) &&
1053 gid_eq(cred->gid, fc->group_id))
1059 static int fuse_access(struct inode *inode, int mask)
1061 struct fuse_conn *fc = get_fuse_conn(inode);
1062 struct fuse_req *req;
1063 struct fuse_access_in inarg;
1069 req = fuse_get_req_nopages(fc);
1071 return PTR_ERR(req);
1073 memset(&inarg, 0, sizeof(inarg));
1074 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
1075 req->in.h.opcode = FUSE_ACCESS;
1076 req->in.h.nodeid = get_node_id(inode);
1077 req->in.numargs = 1;
1078 req->in.args[0].size = sizeof(inarg);
1079 req->in.args[0].value = &inarg;
1080 fuse_request_send(fc, req);
1081 err = req->out.h.error;
1082 fuse_put_request(fc, req);
1083 if (err == -ENOSYS) {
1090 static int fuse_perm_getattr(struct inode *inode, int mask)
1092 if (mask & MAY_NOT_BLOCK)
1095 return fuse_do_getattr(inode, NULL, NULL);
1099 * Check permission. The two basic access models of FUSE are:
1101 * 1) Local access checking ('default_permissions' mount option) based
1102 * on file mode. This is the plain old disk filesystem permission
1105 * 2) "Remote" access checking, where server is responsible for
1106 * checking permission in each inode operation. An exception to this
1107 * is if ->permission() was invoked from sys_access() in which case an
1108 * access request is sent. Execute permission is still checked
1109 * locally based on file mode.
1111 static int fuse_permission(struct inode *inode, int mask)
1113 struct fuse_conn *fc = get_fuse_conn(inode);
1114 bool refreshed = false;
1117 if (!fuse_allow_current_process(fc))
1121 * If attributes are needed, refresh them before proceeding
1123 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
1124 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
1125 struct fuse_inode *fi = get_fuse_inode(inode);
1127 if (fi->i_time < get_jiffies_64()) {
1130 err = fuse_perm_getattr(inode, mask);
1136 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
1137 err = generic_permission(inode, mask);
1139 /* If permission is denied, try to refresh file
1140 attributes. This is also needed, because the root
1141 node will at first have no permissions */
1142 if (err == -EACCES && !refreshed) {
1143 err = fuse_perm_getattr(inode, mask);
1145 err = generic_permission(inode, mask);
1148 /* Note: the opposite of the above test does not
1149 exist. So if permissions are revoked this won't be
1150 noticed immediately, only after the attribute
1151 timeout has expired */
1152 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
1153 if (mask & MAY_NOT_BLOCK)
1156 err = fuse_access(inode, mask);
1157 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1158 if (!(inode->i_mode & S_IXUGO)) {
1162 err = fuse_perm_getattr(inode, mask);
1163 if (!err && !(inode->i_mode & S_IXUGO))
1170 static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
1171 struct dir_context *ctx)
1173 while (nbytes >= FUSE_NAME_OFFSET) {
1174 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1175 size_t reclen = FUSE_DIRENT_SIZE(dirent);
1176 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1178 if (reclen > nbytes)
1181 if (!dir_emit(ctx, dirent->name, dirent->namelen,
1182 dirent->ino, dirent->type))
1187 ctx->pos = dirent->off;
1193 static int fuse_direntplus_link(struct file *file,
1194 struct fuse_direntplus *direntplus,
1198 struct fuse_entry_out *o = &direntplus->entry_out;
1199 struct fuse_dirent *dirent = &direntplus->dirent;
1200 struct dentry *parent = file->f_path.dentry;
1201 struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
1202 struct dentry *dentry;
1203 struct dentry *alias;
1204 struct inode *dir = parent->d_inode;
1205 struct fuse_conn *fc;
1206 struct inode *inode;
1210 * Unlike in the case of fuse_lookup, zero nodeid does not mean
1211 * ENOENT. Instead, it only means the userspace filesystem did
1212 * not want to return attributes/handle for this entry.
1219 if (name.name[0] == '.') {
1221 * We could potentially refresh the attributes of the directory
1226 if (name.name[1] == '.' && name.len == 2)
1230 if (invalid_nodeid(o->nodeid))
1232 if (!fuse_valid_type(o->attr.mode))
1235 fc = get_fuse_conn(dir);
1237 name.hash = full_name_hash(name.name, name.len);
1238 dentry = d_lookup(parent, &name);
1240 inode = dentry->d_inode;
1243 } else if (get_node_id(inode) != o->nodeid ||
1244 ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
1245 err = d_invalidate(dentry);
1248 } else if (is_bad_inode(inode)) {
1252 struct fuse_inode *fi;
1253 fi = get_fuse_inode(inode);
1254 spin_lock(&fc->lock);
1256 spin_unlock(&fc->lock);
1258 fuse_change_attributes(inode, &o->attr,
1259 entry_attr_timeout(o),
1263 * The other branch to 'found' comes via fuse_iget()
1264 * which bumps nlookup inside
1271 dentry = d_alloc(parent, &name);
1276 inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
1277 &o->attr, entry_attr_timeout(o), attr_version);
1281 alias = fuse_materialise_dentry(dentry, inode);
1282 err = PTR_ERR(alias);
1292 fuse_change_entry_timeout(dentry, o);
1300 static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
1301 struct dir_context *ctx, u64 attr_version)
1303 struct fuse_direntplus *direntplus;
1304 struct fuse_dirent *dirent;
1309 while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
1310 direntplus = (struct fuse_direntplus *) buf;
1311 dirent = &direntplus->dirent;
1312 reclen = FUSE_DIRENTPLUS_SIZE(direntplus);
1314 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1316 if (reclen > nbytes)
1320 /* We fill entries into dstbuf only as much as
1321 it can hold. But we still continue iterating
1322 over remaining entries to link them. If not,
1323 we need to send a FORGET for each of those
1324 which we did not link.
1326 over = !dir_emit(ctx, dirent->name, dirent->namelen,
1327 dirent->ino, dirent->type);
1328 ctx->pos = dirent->off;
1334 ret = fuse_direntplus_link(file, direntplus, attr_version);
1336 fuse_force_forget(file, direntplus->entry_out.nodeid);
1342 static int fuse_readdir(struct file *file, struct dir_context *ctx)
1347 struct inode *inode = file_inode(file);
1348 struct fuse_conn *fc = get_fuse_conn(inode);
1349 struct fuse_req *req;
1350 u64 attr_version = 0;
1352 if (is_bad_inode(inode))
1355 req = fuse_get_req(fc, 1);
1357 return PTR_ERR(req);
1359 page = alloc_page(GFP_KERNEL);
1361 fuse_put_request(fc, req);
1365 plus = fuse_use_readdirplus(inode, ctx);
1366 req->out.argpages = 1;
1368 req->pages[0] = page;
1369 req->page_descs[0].length = PAGE_SIZE;
1371 attr_version = fuse_get_attr_version(fc);
1372 fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
1375 fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
1378 fuse_request_send(fc, req);
1379 nbytes = req->out.args[0].size;
1380 err = req->out.h.error;
1381 fuse_put_request(fc, req);
1384 err = parse_dirplusfile(page_address(page), nbytes,
1388 err = parse_dirfile(page_address(page), nbytes, file,
1394 fuse_invalidate_attr(inode); /* atime changed */
1398 static char *read_link(struct dentry *dentry)
1400 struct inode *inode = dentry->d_inode;
1401 struct fuse_conn *fc = get_fuse_conn(inode);
1402 struct fuse_req *req = fuse_get_req_nopages(fc);
1406 return ERR_CAST(req);
1408 link = (char *) __get_free_page(GFP_KERNEL);
1410 link = ERR_PTR(-ENOMEM);
1413 req->in.h.opcode = FUSE_READLINK;
1414 req->in.h.nodeid = get_node_id(inode);
1415 req->out.argvar = 1;
1416 req->out.numargs = 1;
1417 req->out.args[0].size = PAGE_SIZE - 1;
1418 req->out.args[0].value = link;
1419 fuse_request_send(fc, req);
1420 if (req->out.h.error) {
1421 free_page((unsigned long) link);
1422 link = ERR_PTR(req->out.h.error);
1424 link[req->out.args[0].size] = '\0';
1426 fuse_put_request(fc, req);
1427 fuse_invalidate_attr(inode); /* atime changed */
1431 static void free_link(char *link)
1434 free_page((unsigned long) link);
1437 static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
1439 nd_set_link(nd, read_link(dentry));
1443 static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
1445 free_link(nd_get_link(nd));
1448 static int fuse_dir_open(struct inode *inode, struct file *file)
1450 return fuse_open_common(inode, file, true);
1453 static int fuse_dir_release(struct inode *inode, struct file *file)
1455 fuse_release_common(file, FUSE_RELEASEDIR);
1460 static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
1463 return fuse_fsync_common(file, start, end, datasync, 1);
1466 static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
1469 struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
1471 /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
1475 return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR);
1478 static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
1481 struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
1486 return fuse_ioctl_common(file, cmd, arg,
1487 FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
1490 static bool update_mtime(unsigned ivalid)
1492 /* Always update if mtime is explicitly set */
1493 if (ivalid & ATTR_MTIME_SET)
1496 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1497 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1500 /* In all other cases update */
1504 static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
1506 unsigned ivalid = iattr->ia_valid;
1508 if (ivalid & ATTR_MODE)
1509 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
1510 if (ivalid & ATTR_UID)
1511 arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid);
1512 if (ivalid & ATTR_GID)
1513 arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid);
1514 if (ivalid & ATTR_SIZE)
1515 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
1516 if (ivalid & ATTR_ATIME) {
1517 arg->valid |= FATTR_ATIME;
1518 arg->atime = iattr->ia_atime.tv_sec;
1519 arg->atimensec = iattr->ia_atime.tv_nsec;
1520 if (!(ivalid & ATTR_ATIME_SET))
1521 arg->valid |= FATTR_ATIME_NOW;
1523 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
1524 arg->valid |= FATTR_MTIME;
1525 arg->mtime = iattr->ia_mtime.tv_sec;
1526 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1527 if (!(ivalid & ATTR_MTIME_SET))
1528 arg->valid |= FATTR_MTIME_NOW;
1533 * Prevent concurrent writepages on inode
1535 * This is done by adding a negative bias to the inode write counter
1536 * and waiting for all pending writes to finish.
1538 void fuse_set_nowrite(struct inode *inode)
1540 struct fuse_conn *fc = get_fuse_conn(inode);
1541 struct fuse_inode *fi = get_fuse_inode(inode);
1543 BUG_ON(!mutex_is_locked(&inode->i_mutex));
1545 spin_lock(&fc->lock);
1546 BUG_ON(fi->writectr < 0);
1547 fi->writectr += FUSE_NOWRITE;
1548 spin_unlock(&fc->lock);
1549 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1553 * Allow writepages on inode
1555 * Remove the bias from the writecounter and send any queued
1558 static void __fuse_release_nowrite(struct inode *inode)
1560 struct fuse_inode *fi = get_fuse_inode(inode);
1562 BUG_ON(fi->writectr != FUSE_NOWRITE);
1564 fuse_flush_writepages(inode);
1567 void fuse_release_nowrite(struct inode *inode)
1569 struct fuse_conn *fc = get_fuse_conn(inode);
1571 spin_lock(&fc->lock);
1572 __fuse_release_nowrite(inode);
1573 spin_unlock(&fc->lock);
1577 * Set attributes, and at the same time refresh them.
1579 * Truncation is slightly complicated, because the 'truncate' request
1580 * may fail, in which case we don't want to touch the mapping.
1581 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1582 * and the actual truncation by hand.
1584 int fuse_do_setattr(struct inode *inode, struct iattr *attr,
1587 struct fuse_conn *fc = get_fuse_conn(inode);
1588 struct fuse_req *req;
1589 struct fuse_setattr_in inarg;
1590 struct fuse_attr_out outarg;
1591 bool is_truncate = false;
1595 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1596 attr->ia_valid |= ATTR_FORCE;
1598 err = inode_change_ok(inode, attr);
1602 if (attr->ia_valid & ATTR_OPEN) {
1603 if (fc->atomic_o_trunc)
1608 if (attr->ia_valid & ATTR_SIZE)
1611 req = fuse_get_req_nopages(fc);
1613 return PTR_ERR(req);
1616 fuse_set_nowrite(inode);
1618 memset(&inarg, 0, sizeof(inarg));
1619 memset(&outarg, 0, sizeof(outarg));
1620 iattr_to_fattr(attr, &inarg);
1622 struct fuse_file *ff = file->private_data;
1623 inarg.valid |= FATTR_FH;
1626 if (attr->ia_valid & ATTR_SIZE) {
1627 /* For mandatory locking in truncate */
1628 inarg.valid |= FATTR_LOCKOWNER;
1629 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1631 req->in.h.opcode = FUSE_SETATTR;
1632 req->in.h.nodeid = get_node_id(inode);
1633 req->in.numargs = 1;
1634 req->in.args[0].size = sizeof(inarg);
1635 req->in.args[0].value = &inarg;
1636 req->out.numargs = 1;
1638 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
1640 req->out.args[0].size = sizeof(outarg);
1641 req->out.args[0].value = &outarg;
1642 fuse_request_send(fc, req);
1643 err = req->out.h.error;
1644 fuse_put_request(fc, req);
1647 fuse_invalidate_attr(inode);
1651 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1652 make_bad_inode(inode);
1657 spin_lock(&fc->lock);
1658 fuse_change_attributes_common(inode, &outarg.attr,
1659 attr_timeout(&outarg));
1660 oldsize = inode->i_size;
1661 i_size_write(inode, outarg.attr.size);
1664 /* NOTE: this may release/reacquire fc->lock */
1665 __fuse_release_nowrite(inode);
1667 spin_unlock(&fc->lock);
1670 * Only call invalidate_inode_pages2() after removing
1671 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1673 if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
1674 truncate_pagecache(inode, oldsize, outarg.attr.size);
1675 invalidate_inode_pages2(inode->i_mapping);
1682 fuse_release_nowrite(inode);
1687 static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1689 struct inode *inode = entry->d_inode;
1691 if (!fuse_allow_current_process(get_fuse_conn(inode)))
1694 if (attr->ia_valid & ATTR_FILE)
1695 return fuse_do_setattr(inode, attr, attr->ia_file);
1697 return fuse_do_setattr(inode, attr, NULL);
1700 static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1703 struct inode *inode = entry->d_inode;
1704 struct fuse_conn *fc = get_fuse_conn(inode);
1706 if (!fuse_allow_current_process(fc))
1709 return fuse_update_attributes(inode, stat, NULL, NULL);
1712 static int fuse_setxattr(struct dentry *entry, const char *name,
1713 const void *value, size_t size, int flags)
1715 struct inode *inode = entry->d_inode;
1716 struct fuse_conn *fc = get_fuse_conn(inode);
1717 struct fuse_req *req;
1718 struct fuse_setxattr_in inarg;
1721 if (fc->no_setxattr)
1724 req = fuse_get_req_nopages(fc);
1726 return PTR_ERR(req);
1728 memset(&inarg, 0, sizeof(inarg));
1730 inarg.flags = flags;
1731 req->in.h.opcode = FUSE_SETXATTR;
1732 req->in.h.nodeid = get_node_id(inode);
1733 req->in.numargs = 3;
1734 req->in.args[0].size = sizeof(inarg);
1735 req->in.args[0].value = &inarg;
1736 req->in.args[1].size = strlen(name) + 1;
1737 req->in.args[1].value = name;
1738 req->in.args[2].size = size;
1739 req->in.args[2].value = value;
1740 fuse_request_send(fc, req);
1741 err = req->out.h.error;
1742 fuse_put_request(fc, req);
1743 if (err == -ENOSYS) {
1744 fc->no_setxattr = 1;
1750 static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
1751 void *value, size_t size)
1753 struct inode *inode = entry->d_inode;
1754 struct fuse_conn *fc = get_fuse_conn(inode);
1755 struct fuse_req *req;
1756 struct fuse_getxattr_in inarg;
1757 struct fuse_getxattr_out outarg;
1760 if (fc->no_getxattr)
1763 req = fuse_get_req_nopages(fc);
1765 return PTR_ERR(req);
1767 memset(&inarg, 0, sizeof(inarg));
1769 req->in.h.opcode = FUSE_GETXATTR;
1770 req->in.h.nodeid = get_node_id(inode);
1771 req->in.numargs = 2;
1772 req->in.args[0].size = sizeof(inarg);
1773 req->in.args[0].value = &inarg;
1774 req->in.args[1].size = strlen(name) + 1;
1775 req->in.args[1].value = name;
1776 /* This is really two different operations rolled into one */
1777 req->out.numargs = 1;
1779 req->out.argvar = 1;
1780 req->out.args[0].size = size;
1781 req->out.args[0].value = value;
1783 req->out.args[0].size = sizeof(outarg);
1784 req->out.args[0].value = &outarg;
1786 fuse_request_send(fc, req);
1787 ret = req->out.h.error;
1789 ret = size ? req->out.args[0].size : outarg.size;
1791 if (ret == -ENOSYS) {
1792 fc->no_getxattr = 1;
1796 fuse_put_request(fc, req);
1800 static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
1802 struct inode *inode = entry->d_inode;
1803 struct fuse_conn *fc = get_fuse_conn(inode);
1804 struct fuse_req *req;
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 req = fuse_get_req_nopages(fc);
1817 return PTR_ERR(req);
1819 memset(&inarg, 0, sizeof(inarg));
1821 req->in.h.opcode = FUSE_LISTXATTR;
1822 req->in.h.nodeid = get_node_id(inode);
1823 req->in.numargs = 1;
1824 req->in.args[0].size = sizeof(inarg);
1825 req->in.args[0].value = &inarg;
1826 /* This is really two different operations rolled into one */
1827 req->out.numargs = 1;
1829 req->out.argvar = 1;
1830 req->out.args[0].size = size;
1831 req->out.args[0].value = list;
1833 req->out.args[0].size = sizeof(outarg);
1834 req->out.args[0].value = &outarg;
1836 fuse_request_send(fc, req);
1837 ret = req->out.h.error;
1839 ret = size ? req->out.args[0].size : outarg.size;
1841 if (ret == -ENOSYS) {
1842 fc->no_listxattr = 1;
1846 fuse_put_request(fc, req);
1850 static int fuse_removexattr(struct dentry *entry, const char *name)
1852 struct inode *inode = entry->d_inode;
1853 struct fuse_conn *fc = get_fuse_conn(inode);
1854 struct fuse_req *req;
1857 if (fc->no_removexattr)
1860 req = fuse_get_req_nopages(fc);
1862 return PTR_ERR(req);
1864 req->in.h.opcode = FUSE_REMOVEXATTR;
1865 req->in.h.nodeid = get_node_id(inode);
1866 req->in.numargs = 1;
1867 req->in.args[0].size = strlen(name) + 1;
1868 req->in.args[0].value = name;
1869 fuse_request_send(fc, req);
1870 err = req->out.h.error;
1871 fuse_put_request(fc, req);
1872 if (err == -ENOSYS) {
1873 fc->no_removexattr = 1;
1879 static const struct inode_operations fuse_dir_inode_operations = {
1880 .lookup = fuse_lookup,
1881 .mkdir = fuse_mkdir,
1882 .symlink = fuse_symlink,
1883 .unlink = fuse_unlink,
1884 .rmdir = fuse_rmdir,
1885 .rename = fuse_rename,
1887 .setattr = fuse_setattr,
1888 .create = fuse_create,
1889 .atomic_open = fuse_atomic_open,
1890 .mknod = fuse_mknod,
1891 .permission = fuse_permission,
1892 .getattr = fuse_getattr,
1893 .setxattr = fuse_setxattr,
1894 .getxattr = fuse_getxattr,
1895 .listxattr = fuse_listxattr,
1896 .removexattr = fuse_removexattr,
1899 static const struct file_operations fuse_dir_operations = {
1900 .llseek = generic_file_llseek,
1901 .read = generic_read_dir,
1902 .iterate = fuse_readdir,
1903 .open = fuse_dir_open,
1904 .release = fuse_dir_release,
1905 .fsync = fuse_dir_fsync,
1906 .unlocked_ioctl = fuse_dir_ioctl,
1907 .compat_ioctl = fuse_dir_compat_ioctl,
1910 static const struct inode_operations fuse_common_inode_operations = {
1911 .setattr = fuse_setattr,
1912 .permission = fuse_permission,
1913 .getattr = fuse_getattr,
1914 .setxattr = fuse_setxattr,
1915 .getxattr = fuse_getxattr,
1916 .listxattr = fuse_listxattr,
1917 .removexattr = fuse_removexattr,
1920 static const struct inode_operations fuse_symlink_inode_operations = {
1921 .setattr = fuse_setattr,
1922 .follow_link = fuse_follow_link,
1923 .put_link = fuse_put_link,
1924 .readlink = generic_readlink,
1925 .getattr = fuse_getattr,
1926 .setxattr = fuse_setxattr,
1927 .getxattr = fuse_getxattr,
1928 .listxattr = fuse_listxattr,
1929 .removexattr = fuse_removexattr,
1932 void fuse_init_common(struct inode *inode)
1934 inode->i_op = &fuse_common_inode_operations;
1937 void fuse_init_dir(struct inode *inode)
1939 inode->i_op = &fuse_dir_inode_operations;
1940 inode->i_fop = &fuse_dir_operations;
1943 void fuse_init_symlink(struct inode *inode)
1945 inode->i_op = &fuse_symlink_inode_operations;