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; 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; #ifndef FUSE_MAINLINE #ifdef KERNEL_2_6 sb->s_export_op = &fuse_export_operations; #endif #endif file = fget(d.fd); if (!file) return -EINVAL; fc = get_conn(file, sb); fput(file); if (IS_ERR(fc)) return PTR_ERR(fc); fc->flags = d.flags; fc->user_id = d.user_id; fc->group_id = d.group_id; fc->max_read = d.max_read; #ifdef KERNEL_2_6 if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages) fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE; #endif err = -ENOMEM; root = get_root_inode(sb, d.rootmode); if (root == NULL) goto err; sb->s_root = d_alloc_root(root); if (!sb->s_root) { iput(root); goto err; } fuse_send_init(fc); return 0; err: spin_lock(&fuse_lock); fuse_release_conn(fc); spin_unlock(&fuse_lock); return err; }
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; int is_bdev = sb->s_bdev != NULL; if (sb->s_flags & MS_MANDLOCK) return -EINVAL; if (!parse_fuse_opt((char *) data, &d, is_bdev)) return -EINVAL; if (is_bdev) { #ifdef CONFIG_BLOCK if (!sb_set_blocksize(sb, d.blksize)) return -EINVAL; #endif } else { 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; sb->s_export_op = &fuse_export_operations; file = fget(d.fd); if (!file) return -EINVAL; if (file->f_op != &fuse_dev_operations) return -EINVAL; fc = new_conn(sb); if (!fc) return -ENOMEM; fc->flags = d.flags; fc->user_id = d.user_id; fc->group_id = d.group_id; fc->max_read = max_t(unsigned, 4096, 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; if (is_bdev) { fc->destroy_req = fuse_request_alloc(); if (!fc->destroy_req) goto err_free_init_req; } mutex_lock(&fuse_mutex); err = -EINVAL; if (file->private_data) goto err_unlock; err = fuse_ctl_add_conn(fc); if (err) goto err_unlock; list_add_tail(&fc->entry, &fuse_conn_list); sb->s_root = root_dentry; fc->connected = 1; file->private_data = fuse_conn_get(fc); mutex_unlock(&fuse_mutex); /* * 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_unlock: mutex_unlock(&fuse_mutex); err_free_init_req: fuse_request_free(init_req); err_put_root: dput(root_dentry); err: fput(file); fuse_conn_put(fc); return err; }