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/slab.h>
13 #include <linux/file.h>
14 #include <linux/seq_file.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/fs_context.h>
19 #include <linux/fs_parser.h>
20 #include <linux/statfs.h>
21 #include <linux/random.h>
22 #include <linux/sched.h>
23 #include <linux/exportfs.h>
24 #include <linux/posix_acl.h>
25 #include <linux/pid_namespace.h>
27 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
28 MODULE_DESCRIPTION("Filesystem in Userspace");
29 MODULE_LICENSE("GPL");
31 static struct kmem_cache *fuse_inode_cachep;
32 struct list_head fuse_conn_list;
33 DEFINE_MUTEX(fuse_mutex);
35 static int set_global_limit(const char *val, const struct kernel_param *kp);
37 unsigned max_user_bgreq;
38 module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
39 &max_user_bgreq, 0644);
40 __MODULE_PARM_TYPE(max_user_bgreq, "uint");
41 MODULE_PARM_DESC(max_user_bgreq,
42 "Global limit for the maximum number of backgrounded requests an "
43 "unprivileged user can set");
45 unsigned max_user_congthresh;
46 module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
47 &max_user_congthresh, 0644);
48 __MODULE_PARM_TYPE(max_user_congthresh, "uint");
49 MODULE_PARM_DESC(max_user_congthresh,
50 "Global limit for the maximum congestion threshold an "
51 "unprivileged user can set");
53 #define FUSE_SUPER_MAGIC 0x65735546
55 #define FUSE_DEFAULT_BLKSIZE 512
57 /** Maximum number of outstanding background requests */
58 #define FUSE_DEFAULT_MAX_BACKGROUND 12
60 /** Congestion starts at 75% of maximum */
61 #define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)
64 static struct file_system_type fuseblk_fs_type;
67 struct fuse_forget_link *fuse_alloc_forget(void)
69 return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL_ACCOUNT);
72 static struct inode *fuse_alloc_inode(struct super_block *sb)
74 struct fuse_inode *fi;
76 fi = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
87 mutex_init(&fi->mutex);
88 init_rwsem(&fi->i_mmap_sem);
89 spin_lock_init(&fi->lock);
90 fi->forget = fuse_alloc_forget();
94 if (IS_ENABLED(CONFIG_FUSE_DAX) && !fuse_dax_inode_alloc(sb, fi))
102 kmem_cache_free(fuse_inode_cachep, fi);
106 static void fuse_free_inode(struct inode *inode)
108 struct fuse_inode *fi = get_fuse_inode(inode);
110 mutex_destroy(&fi->mutex);
112 #ifdef CONFIG_FUSE_DAX
115 kmem_cache_free(fuse_inode_cachep, fi);
118 static void fuse_evict_inode(struct inode *inode)
120 struct fuse_inode *fi = get_fuse_inode(inode);
122 /* Will write inode on close/munmap and in all other dirtiers */
123 WARN_ON(inode->i_state & I_DIRTY_INODE);
125 truncate_inode_pages_final(&inode->i_data);
127 if (inode->i_sb->s_flags & SB_ACTIVE) {
128 struct fuse_conn *fc = get_fuse_conn(inode);
130 if (FUSE_IS_DAX(inode))
131 fuse_dax_inode_cleanup(inode);
133 fuse_queue_forget(fc, fi->forget, fi->nodeid,
138 if (S_ISREG(inode->i_mode) && !fuse_is_bad(inode)) {
139 WARN_ON(!list_empty(&fi->write_files));
140 WARN_ON(!list_empty(&fi->queued_writes));
144 static int fuse_reconfigure(struct fs_context *fc)
146 struct super_block *sb = fc->root->d_sb;
149 if (fc->sb_flags & SB_MANDLOCK)
156 * ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
157 * so that it will fit.
159 static ino_t fuse_squash_ino(u64 ino64)
161 ino_t ino = (ino_t) ino64;
162 if (sizeof(ino_t) < sizeof(u64))
163 ino ^= ino64 >> (sizeof(u64) - sizeof(ino_t)) * 8;
167 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
170 struct fuse_conn *fc = get_fuse_conn(inode);
171 struct fuse_inode *fi = get_fuse_inode(inode);
173 lockdep_assert_held(&fi->lock);
175 fi->attr_version = atomic64_inc_return(&fc->attr_version);
176 fi->i_time = attr_valid;
177 WRITE_ONCE(fi->inval_mask, 0);
179 inode->i_ino = fuse_squash_ino(attr->ino);
180 inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
181 set_nlink(inode, attr->nlink);
182 inode->i_uid = make_kuid(fc->user_ns, attr->uid);
183 inode->i_gid = make_kgid(fc->user_ns, attr->gid);
184 inode->i_blocks = attr->blocks;
187 attr->atimensec = min_t(u32, attr->atimensec, NSEC_PER_SEC - 1);
188 attr->mtimensec = min_t(u32, attr->mtimensec, NSEC_PER_SEC - 1);
189 attr->ctimensec = min_t(u32, attr->ctimensec, NSEC_PER_SEC - 1);
191 inode->i_atime.tv_sec = attr->atime;
192 inode->i_atime.tv_nsec = attr->atimensec;
193 /* mtime from server may be stale due to local buffered write */
194 if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) {
195 inode->i_mtime.tv_sec = attr->mtime;
196 inode->i_mtime.tv_nsec = attr->mtimensec;
197 inode->i_ctime.tv_sec = attr->ctime;
198 inode->i_ctime.tv_nsec = attr->ctimensec;
201 if (attr->blksize != 0)
202 inode->i_blkbits = ilog2(attr->blksize);
204 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
207 * Don't set the sticky bit in i_mode, unless we want the VFS
208 * to check permissions. This prevents failures due to the
209 * check in may_delete().
211 fi->orig_i_mode = inode->i_mode;
212 if (!fc->default_permissions)
213 inode->i_mode &= ~S_ISVTX;
215 fi->orig_ino = attr->ino;
218 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
219 u64 attr_valid, u64 attr_version)
221 struct fuse_conn *fc = get_fuse_conn(inode);
222 struct fuse_inode *fi = get_fuse_inode(inode);
223 bool is_wb = fc->writeback_cache;
225 struct timespec64 old_mtime;
227 spin_lock(&fi->lock);
228 if ((attr_version != 0 && fi->attr_version > attr_version) ||
229 test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
230 spin_unlock(&fi->lock);
234 old_mtime = inode->i_mtime;
235 fuse_change_attributes_common(inode, attr, attr_valid);
237 oldsize = inode->i_size;
239 * In case of writeback_cache enabled, the cached writes beyond EOF
240 * extend local i_size without keeping userspace server in sync. So,
241 * attr->size coming from server can be stale. We cannot trust it.
243 if (!is_wb || !S_ISREG(inode->i_mode))
244 i_size_write(inode, attr->size);
245 spin_unlock(&fi->lock);
247 if (!is_wb && S_ISREG(inode->i_mode)) {
250 if (oldsize != attr->size) {
251 truncate_pagecache(inode, attr->size);
252 if (!fc->explicit_inval_data)
254 } else if (fc->auto_inval_data) {
255 struct timespec64 new_mtime = {
256 .tv_sec = attr->mtime,
257 .tv_nsec = attr->mtimensec,
261 * Auto inval mode also checks and invalidates if mtime
264 if (!timespec64_equal(&old_mtime, &new_mtime))
269 invalidate_inode_pages2(inode->i_mapping);
273 static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
275 inode->i_mode = attr->mode & S_IFMT;
276 inode->i_size = attr->size;
277 inode->i_mtime.tv_sec = attr->mtime;
278 inode->i_mtime.tv_nsec = attr->mtimensec;
279 inode->i_ctime.tv_sec = attr->ctime;
280 inode->i_ctime.tv_nsec = attr->ctimensec;
281 if (S_ISREG(inode->i_mode)) {
282 fuse_init_common(inode);
283 fuse_init_file_inode(inode);
284 } else if (S_ISDIR(inode->i_mode))
285 fuse_init_dir(inode);
286 else if (S_ISLNK(inode->i_mode))
287 fuse_init_symlink(inode);
288 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
289 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
290 fuse_init_common(inode);
291 init_special_inode(inode, inode->i_mode,
292 new_decode_dev(attr->rdev));
297 static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
299 u64 nodeid = *(u64 *) _nodeidp;
300 if (get_node_id(inode) == nodeid)
306 static int fuse_inode_set(struct inode *inode, void *_nodeidp)
308 u64 nodeid = *(u64 *) _nodeidp;
309 get_fuse_inode(inode)->nodeid = nodeid;
313 struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
314 int generation, struct fuse_attr *attr,
315 u64 attr_valid, u64 attr_version)
318 struct fuse_inode *fi;
319 struct fuse_conn *fc = get_fuse_conn_super(sb);
322 * Auto mount points get their node id from the submount root, which is
323 * not a unique identifier within this filesystem.
325 * To avoid conflicts, do not place submount points into the inode hash
328 if (fc->auto_submounts && (attr->flags & FUSE_ATTR_SUBMOUNT) &&
329 S_ISDIR(attr->mode)) {
330 inode = new_inode(sb);
334 fuse_init_inode(inode, attr);
335 get_fuse_inode(inode)->nodeid = nodeid;
336 inode->i_flags |= S_AUTOMOUNT;
341 inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
345 if ((inode->i_state & I_NEW)) {
346 inode->i_flags |= S_NOATIME;
347 if (!fc->writeback_cache || !S_ISREG(attr->mode))
348 inode->i_flags |= S_NOCMTIME;
349 inode->i_generation = generation;
350 fuse_init_inode(inode, attr);
351 unlock_new_inode(inode);
352 } else if (fuse_stale_inode(inode, generation, attr)) {
353 /* nodeid was reused, any I/O on the old inode should fail */
354 fuse_make_bad(inode);
355 if (inode != d_inode(sb->s_root)) {
356 remove_inode_hash(inode);
362 fi = get_fuse_inode(inode);
363 spin_lock(&fi->lock);
365 spin_unlock(&fi->lock);
366 fuse_change_attributes(inode, attr, attr_valid, attr_version);
371 struct inode *fuse_ilookup(struct fuse_conn *fc, u64 nodeid,
372 struct fuse_mount **fm)
374 struct fuse_mount *fm_iter;
377 WARN_ON(!rwsem_is_locked(&fc->killsb));
378 list_for_each_entry(fm_iter, &fc->mounts, fc_entry) {
382 inode = ilookup5(fm_iter->sb, nodeid, fuse_inode_eq, &nodeid);
393 int fuse_reverse_inval_inode(struct fuse_conn *fc, u64 nodeid,
394 loff_t offset, loff_t len)
396 struct fuse_inode *fi;
401 inode = fuse_ilookup(fc, nodeid, NULL);
405 fi = get_fuse_inode(inode);
406 spin_lock(&fi->lock);
407 fi->attr_version = atomic64_inc_return(&fc->attr_version);
408 spin_unlock(&fi->lock);
410 fuse_invalidate_attr(inode);
411 forget_all_cached_acls(inode);
413 pg_start = offset >> PAGE_SHIFT;
417 pg_end = (offset + len - 1) >> PAGE_SHIFT;
418 invalidate_inode_pages2_range(inode->i_mapping,
425 bool fuse_lock_inode(struct inode *inode)
429 if (!get_fuse_conn(inode)->parallel_dirops) {
430 mutex_lock(&get_fuse_inode(inode)->mutex);
437 void fuse_unlock_inode(struct inode *inode, bool locked)
440 mutex_unlock(&get_fuse_inode(inode)->mutex);
443 static void fuse_umount_begin(struct super_block *sb)
445 struct fuse_conn *fc = get_fuse_conn_super(sb);
447 if (!fc->no_force_umount)
451 static void fuse_send_destroy(struct fuse_mount *fm)
453 if (fm->fc->conn_init) {
456 args.opcode = FUSE_DESTROY;
459 fuse_simple_request(fm, &args);
463 static void fuse_put_super(struct super_block *sb)
465 struct fuse_mount *fm = get_fuse_mount_super(sb);
470 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
472 stbuf->f_type = FUSE_SUPER_MAGIC;
473 stbuf->f_bsize = attr->bsize;
474 stbuf->f_frsize = attr->frsize;
475 stbuf->f_blocks = attr->blocks;
476 stbuf->f_bfree = attr->bfree;
477 stbuf->f_bavail = attr->bavail;
478 stbuf->f_files = attr->files;
479 stbuf->f_ffree = attr->ffree;
480 stbuf->f_namelen = attr->namelen;
481 /* fsid is left zero */
484 static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
486 struct super_block *sb = dentry->d_sb;
487 struct fuse_mount *fm = get_fuse_mount_super(sb);
489 struct fuse_statfs_out outarg;
492 if (!fuse_allow_current_process(fm->fc)) {
493 buf->f_type = FUSE_SUPER_MAGIC;
497 memset(&outarg, 0, sizeof(outarg));
499 args.opcode = FUSE_STATFS;
500 args.nodeid = get_node_id(d_inode(dentry));
501 args.out_numargs = 1;
502 args.out_args[0].size = sizeof(outarg);
503 args.out_args[0].value = &outarg;
504 err = fuse_simple_request(fm, &args);
506 convert_fuse_statfs(buf, &outarg.st);
517 OPT_DEFAULT_PERMISSIONS,
524 static const struct fs_parameter_spec fuse_fs_parameters[] = {
525 fsparam_string ("source", OPT_SOURCE),
526 fsparam_u32 ("fd", OPT_FD),
527 fsparam_u32oct ("rootmode", OPT_ROOTMODE),
528 fsparam_u32 ("user_id", OPT_USER_ID),
529 fsparam_u32 ("group_id", OPT_GROUP_ID),
530 fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS),
531 fsparam_flag ("allow_other", OPT_ALLOW_OTHER),
532 fsparam_u32 ("max_read", OPT_MAX_READ),
533 fsparam_u32 ("blksize", OPT_BLKSIZE),
534 fsparam_string ("subtype", OPT_SUBTYPE),
538 static int fuse_parse_param(struct fs_context *fc, struct fs_parameter *param)
540 struct fs_parse_result result;
541 struct fuse_fs_context *ctx = fc->fs_private;
544 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
546 * Ignore options coming from mount(MS_REMOUNT) for backward
552 return invalfc(fc, "No changes allowed in reconfigure");
555 opt = fs_parse(fc, fuse_fs_parameters, param, &result);
562 return invalfc(fc, "Multiple sources specified");
563 fc->source = param->string;
564 param->string = NULL;
569 return invalfc(fc, "Multiple subtypes specified");
570 ctx->subtype = param->string;
571 param->string = NULL;
575 ctx->fd = result.uint_32;
576 ctx->fd_present = true;
580 if (!fuse_valid_type(result.uint_32))
581 return invalfc(fc, "Invalid rootmode");
582 ctx->rootmode = result.uint_32;
583 ctx->rootmode_present = true;
587 ctx->user_id = make_kuid(fc->user_ns, result.uint_32);
588 if (!uid_valid(ctx->user_id))
589 return invalfc(fc, "Invalid user_id");
590 ctx->user_id_present = true;
594 ctx->group_id = make_kgid(fc->user_ns, result.uint_32);
595 if (!gid_valid(ctx->group_id))
596 return invalfc(fc, "Invalid group_id");
597 ctx->group_id_present = true;
600 case OPT_DEFAULT_PERMISSIONS:
601 ctx->default_permissions = true;
604 case OPT_ALLOW_OTHER:
605 ctx->allow_other = true;
609 ctx->max_read = result.uint_32;
614 return invalfc(fc, "blksize only supported for fuseblk");
615 ctx->blksize = result.uint_32;
625 static void fuse_free_fc(struct fs_context *fc)
627 struct fuse_fs_context *ctx = fc->fs_private;
635 static int fuse_show_options(struct seq_file *m, struct dentry *root)
637 struct super_block *sb = root->d_sb;
638 struct fuse_conn *fc = get_fuse_conn_super(sb);
640 if (fc->legacy_opts_show) {
641 seq_printf(m, ",user_id=%u",
642 from_kuid_munged(fc->user_ns, fc->user_id));
643 seq_printf(m, ",group_id=%u",
644 from_kgid_munged(fc->user_ns, fc->group_id));
645 if (fc->default_permissions)
646 seq_puts(m, ",default_permissions");
648 seq_puts(m, ",allow_other");
649 if (fc->max_read != ~0)
650 seq_printf(m, ",max_read=%u", fc->max_read);
651 if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
652 seq_printf(m, ",blksize=%lu", sb->s_blocksize);
654 #ifdef CONFIG_FUSE_DAX
662 static void fuse_iqueue_init(struct fuse_iqueue *fiq,
663 const struct fuse_iqueue_ops *ops,
666 memset(fiq, 0, sizeof(struct fuse_iqueue));
667 spin_lock_init(&fiq->lock);
668 init_waitqueue_head(&fiq->waitq);
669 INIT_LIST_HEAD(&fiq->pending);
670 INIT_LIST_HEAD(&fiq->interrupts);
671 fiq->forget_list_tail = &fiq->forget_list_head;
677 static void fuse_pqueue_init(struct fuse_pqueue *fpq)
681 spin_lock_init(&fpq->lock);
682 for (i = 0; i < FUSE_PQ_HASH_SIZE; i++)
683 INIT_LIST_HEAD(&fpq->processing[i]);
684 INIT_LIST_HEAD(&fpq->io);
688 void fuse_conn_init(struct fuse_conn *fc, struct fuse_mount *fm,
689 struct user_namespace *user_ns,
690 const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv)
692 memset(fc, 0, sizeof(*fc));
693 spin_lock_init(&fc->lock);
694 spin_lock_init(&fc->bg_lock);
695 init_rwsem(&fc->killsb);
696 refcount_set(&fc->count, 1);
697 atomic_set(&fc->dev_count, 1);
698 init_waitqueue_head(&fc->blocked_waitq);
699 fuse_iqueue_init(&fc->iq, fiq_ops, fiq_priv);
700 INIT_LIST_HEAD(&fc->bg_queue);
701 INIT_LIST_HEAD(&fc->entry);
702 INIT_LIST_HEAD(&fc->devices);
703 atomic_set(&fc->num_waiting, 0);
704 fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
705 fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
706 atomic64_set(&fc->khctr, 0);
707 fc->polled_files = RB_ROOT;
711 atomic64_set(&fc->attr_version, 1);
712 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
713 fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
714 fc->user_ns = get_user_ns(user_ns);
715 fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
716 fc->max_pages_limit = FUSE_MAX_MAX_PAGES;
718 INIT_LIST_HEAD(&fc->mounts);
719 list_add(&fm->fc_entry, &fc->mounts);
721 refcount_set(&fm->count, 1);
723 EXPORT_SYMBOL_GPL(fuse_conn_init);
725 void fuse_conn_put(struct fuse_conn *fc)
727 if (refcount_dec_and_test(&fc->count)) {
728 struct fuse_iqueue *fiq = &fc->iq;
730 if (IS_ENABLED(CONFIG_FUSE_DAX))
731 fuse_dax_conn_free(fc);
732 if (fiq->ops->release)
733 fiq->ops->release(fiq);
734 put_pid_ns(fc->pid_ns);
735 put_user_ns(fc->user_ns);
739 EXPORT_SYMBOL_GPL(fuse_conn_put);
741 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
743 refcount_inc(&fc->count);
746 EXPORT_SYMBOL_GPL(fuse_conn_get);
748 void fuse_mount_put(struct fuse_mount *fm)
750 if (refcount_dec_and_test(&fm->count)) {
752 fuse_conn_put(fm->fc);
756 EXPORT_SYMBOL_GPL(fuse_mount_put);
758 struct fuse_mount *fuse_mount_get(struct fuse_mount *fm)
760 refcount_inc(&fm->count);
763 EXPORT_SYMBOL_GPL(fuse_mount_get);
765 static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
767 struct fuse_attr attr;
768 memset(&attr, 0, sizeof(attr));
771 attr.ino = FUSE_ROOT_ID;
773 return fuse_iget(sb, 1, 0, &attr, 0, 0);
776 struct fuse_inode_handle {
781 static struct dentry *fuse_get_dentry(struct super_block *sb,
782 struct fuse_inode_handle *handle)
784 struct fuse_conn *fc = get_fuse_conn_super(sb);
786 struct dentry *entry;
789 if (handle->nodeid == 0)
792 inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
794 struct fuse_entry_out outarg;
795 const struct qstr name = QSTR_INIT(".", 1);
797 if (!fc->export_support)
800 err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
802 if (err && err != -ENOENT)
809 if (get_node_id(inode) != handle->nodeid)
813 if (inode->i_generation != handle->generation)
816 entry = d_obtain_alias(inode);
817 if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
818 fuse_invalidate_entry_cache(entry);
828 static int fuse_encode_fh(struct inode *inode, u32 *fh, int *max_len,
829 struct inode *parent)
831 int len = parent ? 6 : 3;
835 if (*max_len < len) {
837 return FILEID_INVALID;
840 nodeid = get_fuse_inode(inode)->nodeid;
841 generation = inode->i_generation;
843 fh[0] = (u32)(nodeid >> 32);
844 fh[1] = (u32)(nodeid & 0xffffffff);
848 nodeid = get_fuse_inode(parent)->nodeid;
849 generation = parent->i_generation;
851 fh[3] = (u32)(nodeid >> 32);
852 fh[4] = (u32)(nodeid & 0xffffffff);
857 return parent ? 0x82 : 0x81;
860 static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
861 struct fid *fid, int fh_len, int fh_type)
863 struct fuse_inode_handle handle;
865 if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
868 handle.nodeid = (u64) fid->raw[0] << 32;
869 handle.nodeid |= (u64) fid->raw[1];
870 handle.generation = fid->raw[2];
871 return fuse_get_dentry(sb, &handle);
874 static struct dentry *fuse_fh_to_parent(struct super_block *sb,
875 struct fid *fid, int fh_len, int fh_type)
877 struct fuse_inode_handle parent;
879 if (fh_type != 0x82 || fh_len < 6)
882 parent.nodeid = (u64) fid->raw[3] << 32;
883 parent.nodeid |= (u64) fid->raw[4];
884 parent.generation = fid->raw[5];
885 return fuse_get_dentry(sb, &parent);
888 static struct dentry *fuse_get_parent(struct dentry *child)
890 struct inode *child_inode = d_inode(child);
891 struct fuse_conn *fc = get_fuse_conn(child_inode);
893 struct dentry *parent;
894 struct fuse_entry_out outarg;
895 const struct qstr name = QSTR_INIT("..", 2);
898 if (!fc->export_support)
899 return ERR_PTR(-ESTALE);
901 err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
902 &name, &outarg, &inode);
905 return ERR_PTR(-ESTALE);
909 parent = d_obtain_alias(inode);
910 if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
911 fuse_invalidate_entry_cache(parent);
916 static const struct export_operations fuse_export_operations = {
917 .fh_to_dentry = fuse_fh_to_dentry,
918 .fh_to_parent = fuse_fh_to_parent,
919 .encode_fh = fuse_encode_fh,
920 .get_parent = fuse_get_parent,
923 static const struct super_operations fuse_super_operations = {
924 .alloc_inode = fuse_alloc_inode,
925 .free_inode = fuse_free_inode,
926 .evict_inode = fuse_evict_inode,
927 .write_inode = fuse_write_inode,
928 .drop_inode = generic_delete_inode,
929 .put_super = fuse_put_super,
930 .umount_begin = fuse_umount_begin,
931 .statfs = fuse_statfs,
932 .show_options = fuse_show_options,
935 static void sanitize_global_limit(unsigned *limit)
938 * The default maximum number of async requests is calculated to consume
939 * 1/2^13 of the total memory, assuming 392 bytes per request.
942 *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / 392;
944 if (*limit >= 1 << 16)
945 *limit = (1 << 16) - 1;
948 static int set_global_limit(const char *val, const struct kernel_param *kp)
952 rv = param_set_uint(val, kp);
956 sanitize_global_limit((unsigned *)kp->arg);
961 static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
963 int cap_sys_admin = capable(CAP_SYS_ADMIN);
968 sanitize_global_limit(&max_user_bgreq);
969 sanitize_global_limit(&max_user_congthresh);
971 spin_lock(&fc->bg_lock);
972 if (arg->max_background) {
973 fc->max_background = arg->max_background;
975 if (!cap_sys_admin && fc->max_background > max_user_bgreq)
976 fc->max_background = max_user_bgreq;
978 if (arg->congestion_threshold) {
979 fc->congestion_threshold = arg->congestion_threshold;
981 if (!cap_sys_admin &&
982 fc->congestion_threshold > max_user_congthresh)
983 fc->congestion_threshold = max_user_congthresh;
985 spin_unlock(&fc->bg_lock);
988 struct fuse_init_args {
989 struct fuse_args args;
990 struct fuse_init_in in;
991 struct fuse_init_out out;
994 static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
997 struct fuse_conn *fc = fm->fc;
998 struct fuse_init_args *ia = container_of(args, typeof(*ia), args);
999 struct fuse_init_out *arg = &ia->out;
1002 if (error || arg->major != FUSE_KERNEL_VERSION)
1005 unsigned long ra_pages;
1007 process_init_limits(fc, arg);
1009 if (arg->minor >= 6) {
1010 ra_pages = arg->max_readahead / PAGE_SIZE;
1011 if (arg->flags & FUSE_ASYNC_READ)
1013 if (!(arg->flags & FUSE_POSIX_LOCKS))
1015 if (arg->minor >= 17) {
1016 if (!(arg->flags & FUSE_FLOCK_LOCKS))
1019 if (!(arg->flags & FUSE_POSIX_LOCKS))
1022 if (arg->flags & FUSE_ATOMIC_O_TRUNC)
1023 fc->atomic_o_trunc = 1;
1024 if (arg->minor >= 9) {
1025 /* LOOKUP has dependency on proto version */
1026 if (arg->flags & FUSE_EXPORT_SUPPORT)
1027 fc->export_support = 1;
1029 if (arg->flags & FUSE_BIG_WRITES)
1031 if (arg->flags & FUSE_DONT_MASK)
1033 if (arg->flags & FUSE_AUTO_INVAL_DATA)
1034 fc->auto_inval_data = 1;
1035 else if (arg->flags & FUSE_EXPLICIT_INVAL_DATA)
1036 fc->explicit_inval_data = 1;
1037 if (arg->flags & FUSE_DO_READDIRPLUS) {
1038 fc->do_readdirplus = 1;
1039 if (arg->flags & FUSE_READDIRPLUS_AUTO)
1040 fc->readdirplus_auto = 1;
1042 if (arg->flags & FUSE_ASYNC_DIO)
1044 if (arg->flags & FUSE_WRITEBACK_CACHE)
1045 fc->writeback_cache = 1;
1046 if (arg->flags & FUSE_PARALLEL_DIROPS)
1047 fc->parallel_dirops = 1;
1048 if (arg->flags & FUSE_HANDLE_KILLPRIV)
1049 fc->handle_killpriv = 1;
1050 if (arg->time_gran && arg->time_gran <= 1000000000)
1051 fm->sb->s_time_gran = arg->time_gran;
1052 if ((arg->flags & FUSE_POSIX_ACL)) {
1053 fc->default_permissions = 1;
1055 fm->sb->s_xattr = fuse_acl_xattr_handlers;
1057 if (arg->flags & FUSE_CACHE_SYMLINKS)
1058 fc->cache_symlinks = 1;
1059 if (arg->flags & FUSE_ABORT_ERROR)
1061 if (arg->flags & FUSE_MAX_PAGES) {
1063 min_t(unsigned int, fc->max_pages_limit,
1064 max_t(unsigned int, arg->max_pages, 1));
1066 if (IS_ENABLED(CONFIG_FUSE_DAX) &&
1067 arg->flags & FUSE_MAP_ALIGNMENT &&
1068 !fuse_dax_check_alignment(fc, arg->map_alignment)) {
1072 ra_pages = fc->max_read / PAGE_SIZE;
1077 fm->sb->s_bdi->ra_pages =
1078 min(fm->sb->s_bdi->ra_pages, ra_pages);
1079 fc->minor = arg->minor;
1080 fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
1081 fc->max_write = max_t(unsigned, 4096, fc->max_write);
1091 fuse_set_initialized(fc);
1092 wake_up_all(&fc->blocked_waitq);
1095 void fuse_send_init(struct fuse_mount *fm)
1097 struct fuse_init_args *ia;
1099 ia = kzalloc(sizeof(*ia), GFP_KERNEL | __GFP_NOFAIL);
1101 ia->in.major = FUSE_KERNEL_VERSION;
1102 ia->in.minor = FUSE_KERNEL_MINOR_VERSION;
1103 ia->in.max_readahead = fm->sb->s_bdi->ra_pages * PAGE_SIZE;
1105 FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
1106 FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
1107 FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
1108 FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
1109 FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
1110 FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT |
1111 FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL |
1112 FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS |
1113 FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA;
1114 #ifdef CONFIG_FUSE_DAX
1116 ia->in.flags |= FUSE_MAP_ALIGNMENT;
1118 if (fm->fc->auto_submounts)
1119 ia->in.flags |= FUSE_SUBMOUNTS;
1121 ia->args.opcode = FUSE_INIT;
1122 ia->args.in_numargs = 1;
1123 ia->args.in_args[0].size = sizeof(ia->in);
1124 ia->args.in_args[0].value = &ia->in;
1125 ia->args.out_numargs = 1;
1126 /* Variable length argument used for backward compatibility
1127 with interface version < 7.5. Rest of init_out is zeroed
1128 by do_get_request(), so a short reply is not a problem */
1129 ia->args.out_argvar = true;
1130 ia->args.out_args[0].size = sizeof(ia->out);
1131 ia->args.out_args[0].value = &ia->out;
1132 ia->args.force = true;
1133 ia->args.nocreds = true;
1134 ia->args.end = process_init_reply;
1136 if (fuse_simple_background(fm, &ia->args, GFP_KERNEL) != 0)
1137 process_init_reply(fm, &ia->args, -ENOTCONN);
1139 EXPORT_SYMBOL_GPL(fuse_send_init);
1141 void fuse_free_conn(struct fuse_conn *fc)
1143 WARN_ON(!list_empty(&fc->devices));
1146 EXPORT_SYMBOL_GPL(fuse_free_conn);
1148 static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
1154 suffix = "-fuseblk";
1156 * sb->s_bdi points to blkdev's bdi however we want to redirect
1157 * it to our private bdi...
1160 sb->s_bdi = &noop_backing_dev_info;
1162 err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev),
1163 MINOR(fc->dev), suffix);
1167 /* fuse does it's own writeback accounting */
1168 sb->s_bdi->capabilities &= ~BDI_CAP_WRITEBACK_ACCT;
1169 sb->s_bdi->capabilities |= BDI_CAP_STRICTLIMIT;
1172 * For a single fuse filesystem use max 1% of dirty +
1173 * writeback threshold.
1175 * This gives about 1M of write buffer for memory maps on a
1176 * machine with 1G and 10% dirty_ratio, which should be more
1179 * Privileged users can raise it by writing to
1181 * /sys/class/bdi/<bdi>/max_ratio
1183 bdi_set_max_ratio(sb->s_bdi, 1);
1188 struct fuse_dev *fuse_dev_alloc(void)
1190 struct fuse_dev *fud;
1191 struct list_head *pq;
1193 fud = kzalloc(sizeof(struct fuse_dev), GFP_KERNEL);
1197 pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL);
1203 fud->pq.processing = pq;
1204 fuse_pqueue_init(&fud->pq);
1208 EXPORT_SYMBOL_GPL(fuse_dev_alloc);
1210 void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc)
1212 fud->fc = fuse_conn_get(fc);
1213 spin_lock(&fc->lock);
1214 list_add_tail(&fud->entry, &fc->devices);
1215 spin_unlock(&fc->lock);
1217 EXPORT_SYMBOL_GPL(fuse_dev_install);
1219 struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc)
1221 struct fuse_dev *fud;
1223 fud = fuse_dev_alloc();
1227 fuse_dev_install(fud, fc);
1230 EXPORT_SYMBOL_GPL(fuse_dev_alloc_install);
1232 void fuse_dev_free(struct fuse_dev *fud)
1234 struct fuse_conn *fc = fud->fc;
1237 spin_lock(&fc->lock);
1238 list_del(&fud->entry);
1239 spin_unlock(&fc->lock);
1243 kfree(fud->pq.processing);
1246 EXPORT_SYMBOL_GPL(fuse_dev_free);
1248 static void fuse_fill_attr_from_inode(struct fuse_attr *attr,
1249 const struct fuse_inode *fi)
1251 *attr = (struct fuse_attr){
1252 .ino = fi->inode.i_ino,
1253 .size = fi->inode.i_size,
1254 .blocks = fi->inode.i_blocks,
1255 .atime = fi->inode.i_atime.tv_sec,
1256 .mtime = fi->inode.i_mtime.tv_sec,
1257 .ctime = fi->inode.i_ctime.tv_sec,
1258 .atimensec = fi->inode.i_atime.tv_nsec,
1259 .mtimensec = fi->inode.i_mtime.tv_nsec,
1260 .ctimensec = fi->inode.i_ctime.tv_nsec,
1261 .mode = fi->inode.i_mode,
1262 .nlink = fi->inode.i_nlink,
1263 .uid = fi->inode.i_uid.val,
1264 .gid = fi->inode.i_gid.val,
1265 .rdev = fi->inode.i_rdev,
1266 .blksize = 1u << fi->inode.i_blkbits,
1270 static void fuse_sb_defaults(struct super_block *sb)
1272 sb->s_magic = FUSE_SUPER_MAGIC;
1273 sb->s_op = &fuse_super_operations;
1274 sb->s_xattr = fuse_xattr_handlers;
1275 sb->s_maxbytes = MAX_LFS_FILESIZE;
1276 sb->s_time_gran = 1;
1277 sb->s_export_op = &fuse_export_operations;
1278 sb->s_iflags |= SB_I_IMA_UNVERIFIABLE_SIGNATURE;
1279 if (sb->s_user_ns != &init_user_ns)
1280 sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER;
1281 sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION);
1284 * If we are not in the initial user namespace posix
1285 * acls must be translated.
1287 if (sb->s_user_ns != &init_user_ns)
1288 sb->s_xattr = fuse_no_acl_xattr_handlers;
1291 int fuse_fill_super_submount(struct super_block *sb,
1292 struct fuse_inode *parent_fi)
1294 struct fuse_mount *fm = get_fuse_mount_super(sb);
1295 struct super_block *parent_sb = parent_fi->inode.i_sb;
1296 struct fuse_attr root_attr;
1299 fuse_sb_defaults(sb);
1302 WARN_ON(sb->s_bdi != &noop_backing_dev_info);
1303 sb->s_bdi = bdi_get(parent_sb->s_bdi);
1305 sb->s_xattr = parent_sb->s_xattr;
1306 sb->s_time_gran = parent_sb->s_time_gran;
1307 sb->s_blocksize = parent_sb->s_blocksize;
1308 sb->s_blocksize_bits = parent_sb->s_blocksize_bits;
1309 sb->s_subtype = kstrdup(parent_sb->s_subtype, GFP_KERNEL);
1310 if (parent_sb->s_subtype && !sb->s_subtype)
1313 fuse_fill_attr_from_inode(&root_attr, parent_fi);
1314 root = fuse_iget(sb, parent_fi->nodeid, 0, &root_attr, 0, 0);
1316 * This inode is just a duplicate, so it is not looked up and
1317 * its nlookup should not be incremented. fuse_iget() does
1318 * that, though, so undo it here.
1320 get_fuse_inode(root)->nlookup--;
1321 sb->s_d_op = &fuse_dentry_operations;
1322 sb->s_root = d_make_root(root);
1329 int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx)
1331 struct fuse_dev *fud = NULL;
1332 struct fuse_mount *fm = get_fuse_mount_super(sb);
1333 struct fuse_conn *fc = fm->fc;
1335 struct dentry *root_dentry;
1339 if (sb->s_flags & SB_MANDLOCK)
1342 fuse_sb_defaults(sb);
1347 if (!sb_set_blocksize(sb, ctx->blksize))
1351 sb->s_blocksize = PAGE_SIZE;
1352 sb->s_blocksize_bits = PAGE_SHIFT;
1355 sb->s_subtype = ctx->subtype;
1356 ctx->subtype = NULL;
1357 if (IS_ENABLED(CONFIG_FUSE_DAX)) {
1358 err = fuse_dax_conn_alloc(fc, ctx->dax_dev);
1365 fud = fuse_dev_alloc_install(fc);
1370 fc->dev = sb->s_dev;
1372 err = fuse_bdi_init(fc, sb);
1376 /* Handle umasking inside the fuse code */
1377 if (sb->s_flags & SB_POSIXACL)
1379 sb->s_flags |= SB_POSIXACL;
1381 fc->default_permissions = ctx->default_permissions;
1382 fc->allow_other = ctx->allow_other;
1383 fc->user_id = ctx->user_id;
1384 fc->group_id = ctx->group_id;
1385 fc->legacy_opts_show = ctx->legacy_opts_show;
1386 fc->max_read = max_t(unsigned int, 4096, ctx->max_read);
1387 fc->destroy = ctx->destroy;
1388 fc->no_control = ctx->no_control;
1389 fc->no_force_umount = ctx->no_force_umount;
1392 root = fuse_get_root_inode(sb, ctx->rootmode);
1393 sb->s_d_op = &fuse_root_dentry_operations;
1394 root_dentry = d_make_root(root);
1397 /* Root dentry doesn't have .d_revalidate */
1398 sb->s_d_op = &fuse_dentry_operations;
1400 mutex_lock(&fuse_mutex);
1402 if (ctx->fudptr && *ctx->fudptr)
1405 err = fuse_ctl_add_conn(fc);
1409 list_add_tail(&fc->entry, &fuse_conn_list);
1410 sb->s_root = root_dentry;
1413 mutex_unlock(&fuse_mutex);
1417 mutex_unlock(&fuse_mutex);
1423 if (IS_ENABLED(CONFIG_FUSE_DAX))
1424 fuse_dax_conn_free(fc);
1428 EXPORT_SYMBOL_GPL(fuse_fill_super_common);
1430 static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
1432 struct fuse_fs_context *ctx = fsc->fs_private;
1435 struct fuse_conn *fc;
1436 struct fuse_mount *fm;
1439 file = fget(ctx->fd);
1444 * Require mount to happen from the same user namespace which
1445 * opened /dev/fuse to prevent potential attacks.
1447 if ((file->f_op != &fuse_dev_operations) ||
1448 (file->f_cred->user_ns != sb->s_user_ns))
1450 ctx->fudptr = &file->private_data;
1452 fc = kmalloc(sizeof(*fc), GFP_KERNEL);
1457 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
1463 fuse_conn_init(fc, fm, sb->s_user_ns, &fuse_dev_fiq_ops, NULL);
1464 fc->release = fuse_free_conn;
1468 err = fuse_fill_super_common(sb, ctx);
1472 * atomic_dec_and_test() in fput() provides the necessary
1473 * memory barrier for file->private_data to be visible on all
1477 fuse_send_init(get_fuse_mount_super(sb));
1482 sb->s_fs_info = NULL;
1489 static int fuse_get_tree(struct fs_context *fc)
1491 struct fuse_fs_context *ctx = fc->fs_private;
1493 if (!ctx->fd_present || !ctx->rootmode_present ||
1494 !ctx->user_id_present || !ctx->group_id_present)
1499 return get_tree_bdev(fc, fuse_fill_super);
1502 return get_tree_nodev(fc, fuse_fill_super);
1505 static const struct fs_context_operations fuse_context_ops = {
1506 .free = fuse_free_fc,
1507 .parse_param = fuse_parse_param,
1508 .reconfigure = fuse_reconfigure,
1509 .get_tree = fuse_get_tree,
1513 * Set up the filesystem mount context.
1515 static int fuse_init_fs_context(struct fs_context *fc)
1517 struct fuse_fs_context *ctx;
1519 ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL);
1524 ctx->blksize = FUSE_DEFAULT_BLKSIZE;
1525 ctx->legacy_opts_show = true;
1528 if (fc->fs_type == &fuseblk_fs_type) {
1529 ctx->is_bdev = true;
1530 ctx->destroy = true;
1534 fc->fs_private = ctx;
1535 fc->ops = &fuse_context_ops;
1539 bool fuse_mount_remove(struct fuse_mount *fm)
1541 struct fuse_conn *fc = fm->fc;
1544 down_write(&fc->killsb);
1545 list_del_init(&fm->fc_entry);
1546 if (list_empty(&fc->mounts))
1548 up_write(&fc->killsb);
1552 EXPORT_SYMBOL_GPL(fuse_mount_remove);
1554 void fuse_conn_destroy(struct fuse_mount *fm)
1556 struct fuse_conn *fc = fm->fc;
1559 fuse_send_destroy(fm);
1561 fuse_abort_conn(fc);
1562 fuse_wait_aborted(fc);
1564 if (!list_empty(&fc->entry)) {
1565 mutex_lock(&fuse_mutex);
1566 list_del(&fc->entry);
1567 fuse_ctl_remove_conn(fc);
1568 mutex_unlock(&fuse_mutex);
1571 EXPORT_SYMBOL_GPL(fuse_conn_destroy);
1573 static void fuse_kill_sb_anon(struct super_block *sb)
1575 struct fuse_mount *fm = get_fuse_mount_super(sb);
1579 last = fuse_mount_remove(fm);
1581 fuse_conn_destroy(fm);
1583 kill_anon_super(sb);
1586 static struct file_system_type fuse_fs_type = {
1587 .owner = THIS_MODULE,
1589 .fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT,
1590 .init_fs_context = fuse_init_fs_context,
1591 .parameters = fuse_fs_parameters,
1592 .kill_sb = fuse_kill_sb_anon,
1594 MODULE_ALIAS_FS("fuse");
1597 static void fuse_kill_sb_blk(struct super_block *sb)
1599 struct fuse_mount *fm = get_fuse_mount_super(sb);
1603 last = fuse_mount_remove(fm);
1605 fuse_conn_destroy(fm);
1607 kill_block_super(sb);
1610 static struct file_system_type fuseblk_fs_type = {
1611 .owner = THIS_MODULE,
1613 .init_fs_context = fuse_init_fs_context,
1614 .parameters = fuse_fs_parameters,
1615 .kill_sb = fuse_kill_sb_blk,
1616 .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
1618 MODULE_ALIAS_FS("fuseblk");
1620 static inline int register_fuseblk(void)
1622 return register_filesystem(&fuseblk_fs_type);
1625 static inline void unregister_fuseblk(void)
1627 unregister_filesystem(&fuseblk_fs_type);
1630 static inline int register_fuseblk(void)
1635 static inline void unregister_fuseblk(void)
1640 static void fuse_inode_init_once(void *foo)
1642 struct inode *inode = foo;
1644 inode_init_once(inode);
1647 static int __init fuse_fs_init(void)
1651 fuse_inode_cachep = kmem_cache_create("fuse_inode",
1652 sizeof(struct fuse_inode), 0,
1653 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT|SLAB_RECLAIM_ACCOUNT,
1654 fuse_inode_init_once);
1656 if (!fuse_inode_cachep)
1659 err = register_fuseblk();
1663 err = register_filesystem(&fuse_fs_type);
1670 unregister_fuseblk();
1672 kmem_cache_destroy(fuse_inode_cachep);
1677 static void fuse_fs_cleanup(void)
1679 unregister_filesystem(&fuse_fs_type);
1680 unregister_fuseblk();
1683 * Make sure all delayed rcu free inodes are flushed before we
1687 kmem_cache_destroy(fuse_inode_cachep);
1690 static struct kobject *fuse_kobj;
1692 static int fuse_sysfs_init(void)
1696 fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
1702 err = sysfs_create_mount_point(fuse_kobj, "connections");
1704 goto out_fuse_unregister;
1708 out_fuse_unregister:
1709 kobject_put(fuse_kobj);
1714 static void fuse_sysfs_cleanup(void)
1716 sysfs_remove_mount_point(fuse_kobj, "connections");
1717 kobject_put(fuse_kobj);
1720 static int __init fuse_init(void)
1724 pr_info("init (API version %i.%i)\n",
1725 FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
1727 INIT_LIST_HEAD(&fuse_conn_list);
1728 res = fuse_fs_init();
1732 res = fuse_dev_init();
1734 goto err_fs_cleanup;
1736 res = fuse_sysfs_init();
1738 goto err_dev_cleanup;
1740 res = fuse_ctl_init();
1742 goto err_sysfs_cleanup;
1744 sanitize_global_limit(&max_user_bgreq);
1745 sanitize_global_limit(&max_user_congthresh);
1750 fuse_sysfs_cleanup();
1759 static void __exit fuse_exit(void)
1764 fuse_sysfs_cleanup();
1769 module_init(fuse_init);
1770 module_exit(fuse_exit);