This commit was manufactured by cvs2svn to create branch 'vserver'.
[linux-2.6.git] / fs / fuse / inode.c
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
new file mode 100644 (file)
index 0000000..7627022
--- /dev/null
@@ -0,0 +1,753 @@
+/*
+  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);
+
+       down_write(&fc->sbput_sem);
+       while (!list_empty(&fc->background))
+               fuse_release_background(fc,
+                                       list_entry(fc->background.next,
+                                                  struct fuse_req, bg_entry));
+
+       spin_lock(&fc->lock);
+       fc->mounted = 0;
+       fc->connected = 0;
+       spin_unlock(&fc->lock);
+       up_write(&fc->sbput_sem);
+       /* 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);
+               init_rwsem(&fc->sbput_sem);
+               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;
+
+       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;
+
+       /* Setting file->private_data can't race with other mount()
+          instances, since BKL is held for ->get_sb() */
+       err = -EINVAL;
+       if (file->private_data)
+               goto err_kobject_del;
+
+       sb->s_root = root_dentry;
+       fc->mounted = 1;
+       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_kobject_del:
+       kobject_del(&fc->kobj);
+ 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);