| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu> |
| |
| This program can be distributed under the terms of the GNU GPL. |
| See the file COPYING. |
| */ |
| |
| #include "fuse_i.h" |
| |
| #include <linux/pagemap.h> |
| #include <linux/slab.h> |
| #include <linux/file.h> |
| #include <linux/mount.h> |
| #include <linux/seq_file.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/parser.h> |
| #include <linux/statfs.h> |
| |
| MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); |
| MODULE_DESCRIPTION("Filesystem in Userspace"); |
| MODULE_LICENSE("GPL"); |
| |
| static kmem_cache_t *fuse_inode_cachep; |
| static struct subsystem connections_subsys; |
| |
| struct fuse_conn_attr { |
| struct attribute attr; |
| ssize_t (*show)(struct fuse_conn *, char *); |
| ssize_t (*store)(struct fuse_conn *, const char *, size_t); |
| }; |
| |
| #define FUSE_SUPER_MAGIC 0x65735546 |
| |
| struct fuse_mount_data { |
| int fd; |
| unsigned rootmode; |
| unsigned user_id; |
| unsigned group_id; |
| unsigned fd_present : 1; |
| unsigned rootmode_present : 1; |
| unsigned user_id_present : 1; |
| unsigned group_id_present : 1; |
| unsigned flags; |
| unsigned max_read; |
| }; |
| |
| static struct inode *fuse_alloc_inode(struct super_block *sb) |
| { |
| struct inode *inode; |
| struct fuse_inode *fi; |
| |
| inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL); |
| if (!inode) |
| return NULL; |
| |
| fi = get_fuse_inode(inode); |
| fi->i_time = jiffies - 1; |
| fi->nodeid = 0; |
| fi->nlookup = 0; |
| fi->forget_req = fuse_request_alloc(); |
| if (!fi->forget_req) { |
| kmem_cache_free(fuse_inode_cachep, inode); |
| return NULL; |
| } |
| |
| return inode; |
| } |
| |
| static void fuse_destroy_inode(struct inode *inode) |
| { |
| struct fuse_inode *fi = get_fuse_inode(inode); |
| if (fi->forget_req) |
| fuse_request_free(fi->forget_req); |
| kmem_cache_free(fuse_inode_cachep, inode); |
| } |
| |
| static void fuse_read_inode(struct inode *inode) |
| { |
| /* No op */ |
| } |
| |
| void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, |
| unsigned long nodeid, u64 nlookup) |
| { |
| struct fuse_forget_in *inarg = &req->misc.forget_in; |
| inarg->nlookup = nlookup; |
| req->in.h.opcode = FUSE_FORGET; |
| req->in.h.nodeid = nodeid; |
| req->in.numargs = 1; |
| req->in.args[0].size = sizeof(struct fuse_forget_in); |
| req->in.args[0].value = inarg; |
| request_send_noreply(fc, req); |
| } |
| |
| static void fuse_clear_inode(struct inode *inode) |
| { |
| if (inode->i_sb->s_flags & MS_ACTIVE) { |
| struct fuse_conn *fc = get_fuse_conn(inode); |
| struct fuse_inode *fi = get_fuse_inode(inode); |
| fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup); |
| fi->forget_req = NULL; |
| } |
| } |
| |
| void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) |
| { |
| if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) |
| invalidate_inode_pages(inode->i_mapping); |
| |
| inode->i_ino = attr->ino; |
| inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); |
| inode->i_nlink = attr->nlink; |
| inode->i_uid = attr->uid; |
| inode->i_gid = attr->gid; |
| i_size_write(inode, attr->size); |
| inode->i_blksize = PAGE_CACHE_SIZE; |
| inode->i_blocks = attr->blocks; |
| inode->i_atime.tv_sec = attr->atime; |
| inode->i_atime.tv_nsec = attr->atimensec; |
| inode->i_mtime.tv_sec = attr->mtime; |
| inode->i_mtime.tv_nsec = attr->mtimensec; |
| inode->i_ctime.tv_sec = attr->ctime; |
| inode->i_ctime.tv_nsec = attr->ctimensec; |
| } |
| |
| static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) |
| { |
| inode->i_mode = attr->mode & S_IFMT; |
| i_size_write(inode, attr->size); |
| if (S_ISREG(inode->i_mode)) { |
| fuse_init_common(inode); |
| fuse_init_file_inode(inode); |
| } else if (S_ISDIR(inode->i_mode)) |
| fuse_init_dir(inode); |
| else if (S_ISLNK(inode->i_mode)) |
| fuse_init_symlink(inode); |
| else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || |
| S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { |
| fuse_init_common(inode); |
| init_special_inode(inode, inode->i_mode, |
| new_decode_dev(attr->rdev)); |
| } else |
| BUG(); |
| } |
| |
| static int fuse_inode_eq(struct inode *inode, void *_nodeidp) |
| { |
| unsigned long nodeid = *(unsigned long *) _nodeidp; |
| if (get_node_id(inode) == nodeid) |
| return 1; |
| else |
| return 0; |
| } |
| |
| static int fuse_inode_set(struct inode *inode, void *_nodeidp) |
| { |
| unsigned long nodeid = *(unsigned long *) _nodeidp; |
| get_fuse_inode(inode)->nodeid = nodeid; |
| return 0; |
| } |
| |
| struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, |
| int generation, struct fuse_attr *attr) |
| { |
| struct inode *inode; |
| struct fuse_inode *fi; |
| struct fuse_conn *fc = get_fuse_conn_super(sb); |
| int retried = 0; |
| |
| retry: |
| inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); |
| if (!inode) |
| return NULL; |
| |
| if ((inode->i_state & I_NEW)) { |
| inode->i_flags |= S_NOATIME|S_NOCMTIME; |
| inode->i_generation = generation; |
| inode->i_data.backing_dev_info = &fc->bdi; |
| fuse_init_inode(inode, attr); |
| unlock_new_inode(inode); |
| } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { |
| BUG_ON(retried); |
| /* Inode has changed type, any I/O on the old should fail */ |
| make_bad_inode(inode); |
| iput(inode); |
| retried = 1; |
| goto retry; |
| } |
| |
| fi = get_fuse_inode(inode); |
| fi->nlookup ++; |
| fuse_change_attributes(inode, attr); |
| return inode; |
| } |
| |
| static void fuse_umount_begin(struct super_block *sb) |
| { |
| fuse_abort_conn(get_fuse_conn_super(sb)); |
| } |
| |
| static void fuse_put_super(struct super_block *sb) |
| { |
| struct fuse_conn *fc = get_fuse_conn_super(sb); |
| |
| spin_lock(&fc->lock); |
| fc->connected = 0; |
| while (!list_empty(&fc->background)) { |
| struct fuse_req *req = list_entry(fc->background.next, |
| struct fuse_req, bg_entry); |
| struct inode *inode = req->inode; |
| struct inode *inode2 = req->inode2; |
| |
| /* File would hold a reference to vfsmount */ |
| BUG_ON(req->file); |
| req->inode = NULL; |
| req->inode2 = NULL; |
| fuse_remove_background(fc, req); |
| |
| spin_unlock(&fc->lock); |
| iput(inode); |
| iput(inode2); |
| spin_lock(&fc->lock); |
| } |
| spin_unlock(&fc->lock); |
| /* Flush all readers on this fs */ |
| kill_fasync(&fc->fasync, SIGIO, POLL_IN); |
| wake_up_all(&fc->waitq); |
| kobject_del(&fc->kobj); |
| kobject_put(&fc->kobj); |
| } |
| |
| static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr) |
| { |
| stbuf->f_type = FUSE_SUPER_MAGIC; |
| stbuf->f_bsize = attr->bsize; |
| stbuf->f_frsize = attr->frsize; |
| stbuf->f_blocks = attr->blocks; |
| stbuf->f_bfree = attr->bfree; |
| stbuf->f_bavail = attr->bavail; |
| stbuf->f_files = attr->files; |
| stbuf->f_ffree = attr->ffree; |
| stbuf->f_namelen = attr->namelen; |
| /* fsid is left zero */ |
| } |
| |
| static int fuse_statfs(struct super_block *sb, struct kstatfs *buf) |
| { |
| struct fuse_conn *fc = get_fuse_conn_super(sb); |
| struct fuse_req *req; |
| struct fuse_statfs_out outarg; |
| int err; |
| |
| req = fuse_get_req(fc); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| memset(&outarg, 0, sizeof(outarg)); |
| req->in.numargs = 0; |
| req->in.h.opcode = FUSE_STATFS; |
| req->out.numargs = 1; |
| req->out.args[0].size = |
| fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg); |
| req->out.args[0].value = &outarg; |
| request_send(fc, req); |
| err = req->out.h.error; |
| if (!err) |
| convert_fuse_statfs(buf, &outarg.st); |
| fuse_put_request(fc, req); |
| return err; |
| } |
| |
| enum { |
| OPT_FD, |
| OPT_ROOTMODE, |
| OPT_USER_ID, |
| OPT_GROUP_ID, |
| OPT_DEFAULT_PERMISSIONS, |
| OPT_ALLOW_OTHER, |
| OPT_MAX_READ, |
| OPT_ERR |
| }; |
| |
| static match_table_t tokens = { |
| {OPT_FD, "fd=%u"}, |
| {OPT_ROOTMODE, "rootmode=%o"}, |
| {OPT_USER_ID, "user_id=%u"}, |
| {OPT_GROUP_ID, "group_id=%u"}, |
| {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, |
| {OPT_ALLOW_OTHER, "allow_other"}, |
| {OPT_MAX_READ, "max_read=%u"}, |
| {OPT_ERR, NULL} |
| }; |
| |
| static int parse_fuse_opt(char *opt, struct fuse_mount_data *d) |
| { |
| char *p; |
| memset(d, 0, sizeof(struct fuse_mount_data)); |
| d->max_read = ~0; |
| |
| while ((p = strsep(&opt, ",")) != NULL) { |
| int token; |
| int value; |
| substring_t args[MAX_OPT_ARGS]; |
| if (!*p) |
| continue; |
| |
| token = match_token(p, tokens, args); |
| switch (token) { |
| case OPT_FD: |
| if (match_int(&args[0], &value)) |
| return 0; |
| d->fd = value; |
| d->fd_present = 1; |
| break; |
| |
| case OPT_ROOTMODE: |
| if (match_octal(&args[0], &value)) |
| return 0; |
| d->rootmode = value; |
| d->rootmode_present = 1; |
| break; |
| |
| case OPT_USER_ID: |
| if (match_int(&args[0], &value)) |
| return 0; |
| d->user_id = value; |
| d->user_id_present = 1; |
| break; |
| |
| case OPT_GROUP_ID: |
| if (match_int(&args[0], &value)) |
| return 0; |
| d->group_id = value; |
| d->group_id_present = 1; |
| break; |
| |
| case OPT_DEFAULT_PERMISSIONS: |
| d->flags |= FUSE_DEFAULT_PERMISSIONS; |
| break; |
| |
| case OPT_ALLOW_OTHER: |
| d->flags |= FUSE_ALLOW_OTHER; |
| break; |
| |
| case OPT_MAX_READ: |
| if (match_int(&args[0], &value)) |
| return 0; |
| d->max_read = value; |
| break; |
| |
| default: |
| return 0; |
| } |
| } |
| |
| if (!d->fd_present || !d->rootmode_present || |
| !d->user_id_present || !d->group_id_present) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) |
| { |
| struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb); |
| |
| seq_printf(m, ",user_id=%u", fc->user_id); |
| seq_printf(m, ",group_id=%u", fc->group_id); |
| if (fc->flags & FUSE_DEFAULT_PERMISSIONS) |
| seq_puts(m, ",default_permissions"); |
| if (fc->flags & FUSE_ALLOW_OTHER) |
| seq_puts(m, ",allow_other"); |
| if (fc->max_read != ~0) |
| seq_printf(m, ",max_read=%u", fc->max_read); |
| return 0; |
| } |
| |
| static void fuse_conn_release(struct kobject *kobj) |
| { |
| kfree(get_fuse_conn_kobj(kobj)); |
| } |
| |
| static struct fuse_conn *new_conn(void) |
| { |
| struct fuse_conn *fc; |
| |
| fc = kzalloc(sizeof(*fc), GFP_KERNEL); |
| if (fc) { |
| spin_lock_init(&fc->lock); |
| init_waitqueue_head(&fc->waitq); |
| init_waitqueue_head(&fc->blocked_waitq); |
| INIT_LIST_HEAD(&fc->pending); |
| INIT_LIST_HEAD(&fc->processing); |
| INIT_LIST_HEAD(&fc->io); |
| INIT_LIST_HEAD(&fc->background); |
| kobj_set_kset_s(fc, connections_subsys); |
| kobject_init(&fc->kobj); |
| atomic_set(&fc->num_waiting, 0); |
| fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; |
| fc->bdi.unplug_io_fn = default_unplug_io_fn; |
| fc->reqctr = 0; |
| fc->blocked = 1; |
| } |
| return fc; |
| } |
| |
| static struct inode *get_root_inode(struct super_block *sb, unsigned mode) |
| { |
| struct fuse_attr attr; |
| memset(&attr, 0, sizeof(attr)); |
| |
| attr.mode = mode; |
| attr.ino = FUSE_ROOT_ID; |
| return fuse_iget(sb, 1, 0, &attr); |
| } |
| |
| static struct super_operations fuse_super_operations = { |
| .alloc_inode = fuse_alloc_inode, |
| .destroy_inode = fuse_destroy_inode, |
| .read_inode = fuse_read_inode, |
| .clear_inode = fuse_clear_inode, |
| .put_super = fuse_put_super, |
| .umount_begin = fuse_umount_begin, |
| .statfs = fuse_statfs, |
| .show_options = fuse_show_options, |
| }; |
| |
| static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) |
| { |
| struct fuse_init_out *arg = &req->misc.init_out; |
| |
| if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION) |
| fc->conn_error = 1; |
| else { |
| unsigned long ra_pages; |
| |
| if (arg->minor >= 6) { |
| ra_pages = arg->max_readahead / PAGE_CACHE_SIZE; |
| if (arg->flags & FUSE_ASYNC_READ) |
| fc->async_read = 1; |
| } else |
| ra_pages = fc->max_read / PAGE_CACHE_SIZE; |
| |
| fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages); |
| fc->minor = arg->minor; |
| fc->max_write = arg->minor < 5 ? 4096 : arg->max_write; |
| } |
| fuse_put_request(fc, req); |
| fc->blocked = 0; |
| wake_up_all(&fc->blocked_waitq); |
| } |
| |
| static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req) |
| { |
| struct fuse_init_in *arg = &req->misc.init_in; |
| |
| arg->major = FUSE_KERNEL_VERSION; |
| arg->minor = FUSE_KERNEL_MINOR_VERSION; |
| arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE; |
| arg->flags |= FUSE_ASYNC_READ; |
| req->in.h.opcode = FUSE_INIT; |
| req->in.numargs = 1; |
| req->in.args[0].size = sizeof(*arg); |
| req->in.args[0].value = arg; |
| req->out.numargs = 1; |
| /* Variable length arguement used for backward compatibility |
| with interface version < 7.5. Rest of init_out is zeroed |
| by do_get_request(), so a short reply is not a problem */ |
| req->out.argvar = 1; |
| req->out.args[0].size = sizeof(struct fuse_init_out); |
| req->out.args[0].value = &req->misc.init_out; |
| req->end = process_init_reply; |
| request_send_background(fc, req); |
| } |
| |
| static unsigned long long conn_id(void) |
| { |
| /* BKL is held for ->get_sb() */ |
| static unsigned long long ctr = 1; |
| return ctr++; |
| } |
| |
| static int fuse_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct fuse_conn *fc; |
| struct inode *root; |
| struct fuse_mount_data d; |
| struct file *file; |
| struct dentry *root_dentry; |
| struct fuse_req *init_req; |
| int err; |
| |
| if (!parse_fuse_opt((char *) data, &d)) |
| return -EINVAL; |
| |
| sb->s_blocksize = PAGE_CACHE_SIZE; |
| sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| sb->s_magic = FUSE_SUPER_MAGIC; |
| sb->s_op = &fuse_super_operations; |
| sb->s_maxbytes = MAX_LFS_FILESIZE; |
| |
| file = fget(d.fd); |
| if (!file) |
| return -EINVAL; |
| |
| if (file->f_op != &fuse_dev_operations) |
| return -EINVAL; |
| |
| /* Setting file->private_data can't race with other mount() |
| instances, since BKL is held for ->get_sb() */ |
| if (file->private_data) |
| return -EINVAL; |
| |
| fc = new_conn(); |
| if (!fc) |
| return -ENOMEM; |
| |
| fc->flags = d.flags; |
| fc->user_id = d.user_id; |
| fc->group_id = d.group_id; |
| fc->max_read = d.max_read; |
| |
| /* Used by get_root_inode() */ |
| sb->s_fs_info = fc; |
| |
| err = -ENOMEM; |
| root = get_root_inode(sb, d.rootmode); |
| if (!root) |
| goto err; |
| |
| root_dentry = d_alloc_root(root); |
| if (!root_dentry) { |
| iput(root); |
| goto err; |
| } |
| |
| init_req = fuse_request_alloc(); |
| if (!init_req) |
| goto err_put_root; |
| |
| err = kobject_set_name(&fc->kobj, "%llu", conn_id()); |
| if (err) |
| goto err_free_req; |
| |
| err = kobject_add(&fc->kobj); |
| if (err) |
| goto err_free_req; |
| |
| sb->s_root = root_dentry; |
| fc->connected = 1; |
| kobject_get(&fc->kobj); |
| file->private_data = fc; |
| /* |
| * atomic_dec_and_test() in fput() provides the necessary |
| * memory barrier for file->private_data to be visible on all |
| * CPUs after this |
| */ |
| fput(file); |
| |
| fuse_send_init(fc, init_req); |
| |
| return 0; |
| |
| err_free_req: |
| fuse_request_free(init_req); |
| err_put_root: |
| dput(root_dentry); |
| err: |
| fput(file); |
| kobject_put(&fc->kobj); |
| return err; |
| } |
| |
| static struct super_block *fuse_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, |
| void *raw_data) |
| { |
| return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super); |
| } |
| |
| static struct file_system_type fuse_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "fuse", |
| .get_sb = fuse_get_sb, |
| .kill_sb = kill_anon_super, |
| }; |
| |
| static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page) |
| { |
| return sprintf(page, "%i\n", atomic_read(&fc->num_waiting)); |
| } |
| |
| static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page, |
| size_t count) |
| { |
| fuse_abort_conn(fc); |
| return count; |
| } |
| |
| static struct fuse_conn_attr fuse_conn_waiting = |
| __ATTR(waiting, 0400, fuse_conn_waiting_show, NULL); |
| static struct fuse_conn_attr fuse_conn_abort = |
| __ATTR(abort, 0600, NULL, fuse_conn_abort_store); |
| |
| static struct attribute *fuse_conn_attrs[] = { |
| &fuse_conn_waiting.attr, |
| &fuse_conn_abort.attr, |
| NULL, |
| }; |
| |
| static ssize_t fuse_conn_attr_show(struct kobject *kobj, |
| struct attribute *attr, |
| char *page) |
| { |
| struct fuse_conn_attr *fca = |
| container_of(attr, struct fuse_conn_attr, attr); |
| |
| if (fca->show) |
| return fca->show(get_fuse_conn_kobj(kobj), page); |
| else |
| return -EACCES; |
| } |
| |
| static ssize_t fuse_conn_attr_store(struct kobject *kobj, |
| struct attribute *attr, |
| const char *page, size_t count) |
| { |
| struct fuse_conn_attr *fca = |
| container_of(attr, struct fuse_conn_attr, attr); |
| |
| if (fca->store) |
| return fca->store(get_fuse_conn_kobj(kobj), page, count); |
| else |
| return -EACCES; |
| } |
| |
| static struct sysfs_ops fuse_conn_sysfs_ops = { |
| .show = &fuse_conn_attr_show, |
| .store = &fuse_conn_attr_store, |
| }; |
| |
| static struct kobj_type ktype_fuse_conn = { |
| .release = fuse_conn_release, |
| .sysfs_ops = &fuse_conn_sysfs_ops, |
| .default_attrs = fuse_conn_attrs, |
| }; |
| |
| static decl_subsys(fuse, NULL, NULL); |
| static decl_subsys(connections, &ktype_fuse_conn, NULL); |
| |
| static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep, |
| unsigned long flags) |
| { |
| struct inode * inode = foo; |
| |
| if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| SLAB_CTOR_CONSTRUCTOR) |
| inode_init_once(inode); |
| } |
| |
| static int __init fuse_fs_init(void) |
| { |
| int err; |
| |
| err = register_filesystem(&fuse_fs_type); |
| if (err) |
| printk("fuse: failed to register filesystem\n"); |
| else { |
| fuse_inode_cachep = kmem_cache_create("fuse_inode", |
| sizeof(struct fuse_inode), |
| 0, SLAB_HWCACHE_ALIGN, |
| fuse_inode_init_once, NULL); |
| if (!fuse_inode_cachep) { |
| unregister_filesystem(&fuse_fs_type); |
| err = -ENOMEM; |
| } |
| } |
| |
| return err; |
| } |
| |
| static void fuse_fs_cleanup(void) |
| { |
| unregister_filesystem(&fuse_fs_type); |
| kmem_cache_destroy(fuse_inode_cachep); |
| } |
| |
| static int fuse_sysfs_init(void) |
| { |
| int err; |
| |
| kset_set_kset_s(&fuse_subsys, fs_subsys); |
| err = subsystem_register(&fuse_subsys); |
| if (err) |
| goto out_err; |
| |
| kset_set_kset_s(&connections_subsys, fuse_subsys); |
| err = subsystem_register(&connections_subsys); |
| if (err) |
| goto out_fuse_unregister; |
| |
| return 0; |
| |
| out_fuse_unregister: |
| subsystem_unregister(&fuse_subsys); |
| out_err: |
| return err; |
| } |
| |
| static void fuse_sysfs_cleanup(void) |
| { |
| subsystem_unregister(&connections_subsys); |
| subsystem_unregister(&fuse_subsys); |
| } |
| |
| static int __init fuse_init(void) |
| { |
| int res; |
| |
| printk("fuse init (API version %i.%i)\n", |
| FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
| |
| res = fuse_fs_init(); |
| if (res) |
| goto err; |
| |
| res = fuse_dev_init(); |
| if (res) |
| goto err_fs_cleanup; |
| |
| res = fuse_sysfs_init(); |
| if (res) |
| goto err_dev_cleanup; |
| |
| return 0; |
| |
| err_dev_cleanup: |
| fuse_dev_cleanup(); |
| err_fs_cleanup: |
| fuse_fs_cleanup(); |
| err: |
| return res; |
| } |
| |
| static void __exit fuse_exit(void) |
| { |
| printk(KERN_DEBUG "fuse exit\n"); |
| |
| fuse_sysfs_cleanup(); |
| fuse_fs_cleanup(); |
| fuse_dev_cleanup(); |
| } |
| |
| module_init(fuse_init); |
| module_exit(fuse_exit); |