X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fbtrfs%2Fioctl.c;h=4de7ef6f8603c0168528babc595085d91c0e33c8;hb=9ed74f2dba6ebf9f30b80554290bfc73cc3ef083;hp=35f650e183e18a25f554592241391ed6b1045eeb;hpb=1ffa4f426c002161b7dbd58b297f5d0680e7dd6a;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 35f650e..4de7ef6 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -27,7 +27,6 @@ #include #include #include -#include #include #include #include @@ -38,7 +37,6 @@ #include #include #include -#include #include #include #include "compat.h" @@ -51,8 +49,178 @@ #include "volumes.h" #include "locking.h" +/* Mask out flags that are inappropriate for the given type of inode. */ +static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) +{ + if (S_ISDIR(mode)) + return flags; + else if (S_ISREG(mode)) + return flags & ~FS_DIRSYNC_FL; + else + return flags & (FS_NODUMP_FL | FS_NOATIME_FL); +} + +/* + * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. + */ +static unsigned int btrfs_flags_to_ioctl(unsigned int flags) +{ + unsigned int iflags = 0; + + if (flags & BTRFS_INODE_SYNC) + iflags |= FS_SYNC_FL; + if (flags & BTRFS_INODE_IMMUTABLE) + iflags |= FS_IMMUTABLE_FL; + if (flags & BTRFS_INODE_APPEND) + iflags |= FS_APPEND_FL; + if (flags & BTRFS_INODE_NODUMP) + iflags |= FS_NODUMP_FL; + if (flags & BTRFS_INODE_NOATIME) + iflags |= FS_NOATIME_FL; + if (flags & BTRFS_INODE_DIRSYNC) + iflags |= FS_DIRSYNC_FL; + + return iflags; +} + +/* + * Update inode->i_flags based on the btrfs internal flags. + */ +void btrfs_update_iflags(struct inode *inode) +{ + struct btrfs_inode *ip = BTRFS_I(inode); + + inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); + + if (ip->flags & BTRFS_INODE_SYNC) + inode->i_flags |= S_SYNC; + if (ip->flags & BTRFS_INODE_IMMUTABLE) + inode->i_flags |= S_IMMUTABLE; + if (ip->flags & BTRFS_INODE_APPEND) + inode->i_flags |= S_APPEND; + if (ip->flags & BTRFS_INODE_NOATIME) + inode->i_flags |= S_NOATIME; + if (ip->flags & BTRFS_INODE_DIRSYNC) + inode->i_flags |= S_DIRSYNC; +} + +/* + * Inherit flags from the parent inode. + * + * Unlike extN we don't have any flags we don't want to inherit currently. + */ +void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) +{ + unsigned int flags; + + if (!dir) + return; + + flags = BTRFS_I(dir)->flags; + + if (S_ISREG(inode->i_mode)) + flags &= ~BTRFS_INODE_DIRSYNC; + else if (!S_ISDIR(inode->i_mode)) + flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); + + BTRFS_I(inode)->flags = flags; + btrfs_update_iflags(inode); +} + +static int btrfs_ioctl_getflags(struct file *file, void __user *arg) +{ + struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); + unsigned int flags = btrfs_flags_to_ioctl(ip->flags); + + if (copy_to_user(arg, &flags, sizeof(flags))) + return -EFAULT; + return 0; +} + +static int btrfs_ioctl_setflags(struct file *file, void __user *arg) +{ + struct inode *inode = file->f_path.dentry->d_inode; + struct btrfs_inode *ip = BTRFS_I(inode); + struct btrfs_root *root = ip->root; + struct btrfs_trans_handle *trans; + unsigned int flags, oldflags; + int ret; + + if (copy_from_user(&flags, arg, sizeof(flags))) + return -EFAULT; + + if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ + FS_NOATIME_FL | FS_NODUMP_FL | \ + FS_SYNC_FL | FS_DIRSYNC_FL)) + return -EOPNOTSUPP; + + if (!is_owner_or_cap(inode)) + return -EACCES; + + mutex_lock(&inode->i_mutex); + + flags = btrfs_mask_flags(inode->i_mode, flags); + oldflags = btrfs_flags_to_ioctl(ip->flags); + if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { + if (!capable(CAP_LINUX_IMMUTABLE)) { + ret = -EPERM; + goto out_unlock; + } + } + + ret = mnt_want_write(file->f_path.mnt); + if (ret) + goto out_unlock; + + if (flags & FS_SYNC_FL) + ip->flags |= BTRFS_INODE_SYNC; + else + ip->flags &= ~BTRFS_INODE_SYNC; + if (flags & FS_IMMUTABLE_FL) + ip->flags |= BTRFS_INODE_IMMUTABLE; + else + ip->flags &= ~BTRFS_INODE_IMMUTABLE; + if (flags & FS_APPEND_FL) + ip->flags |= BTRFS_INODE_APPEND; + else + ip->flags &= ~BTRFS_INODE_APPEND; + if (flags & FS_NODUMP_FL) + ip->flags |= BTRFS_INODE_NODUMP; + else + ip->flags &= ~BTRFS_INODE_NODUMP; + if (flags & FS_NOATIME_FL) + ip->flags |= BTRFS_INODE_NOATIME; + else + ip->flags &= ~BTRFS_INODE_NOATIME; + if (flags & FS_DIRSYNC_FL) + ip->flags |= BTRFS_INODE_DIRSYNC; + else + ip->flags &= ~BTRFS_INODE_DIRSYNC; + trans = btrfs_join_transaction(root, 1); + BUG_ON(!trans); + + ret = btrfs_update_inode(trans, root, inode); + BUG_ON(ret); + + btrfs_update_iflags(inode); + inode->i_ctime = CURRENT_TIME; + btrfs_end_transaction(trans, root); + + mnt_drop_write(file->f_path.mnt); + out_unlock: + mutex_unlock(&inode->i_mutex); + return 0; +} + +static int btrfs_ioctl_getversion(struct file *file, int __user *arg) +{ + struct inode *inode = file->f_path.dentry->d_inode; + + return put_user(inode->i_generation, arg); +} + static noinline int create_subvol(struct btrfs_root *root, struct dentry *dentry, char *name, int namelen) @@ -62,8 +230,8 @@ static noinline int create_subvol(struct btrfs_root *root, struct btrfs_root_item root_item; struct btrfs_inode_item *inode_item; struct extent_buffer *leaf; - struct btrfs_root *new_root = root; - struct inode *dir; + struct btrfs_root *new_root; + struct inode *dir = dentry->d_parent->d_inode; int ret; int err; u64 objectid; @@ -71,9 +239,15 @@ static noinline int create_subvol(struct btrfs_root *root, u64 index = 0; unsigned long nr = 1; - ret = btrfs_check_free_space(root, 1, 0); + /* + * 1 - inode item + * 2 - refs + * 1 - root item + * 2 - dir items + */ + ret = btrfs_reserve_metadata_space(root, 6); if (ret) - goto fail_commit; + return ret; trans = btrfs_start_transaction(root, 1); BUG_ON(!trans); @@ -83,22 +257,25 @@ static noinline int create_subvol(struct btrfs_root *root, if (ret) goto fail; - leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, - objectid, trans->transid, 0, 0, 0); + leaf = btrfs_alloc_free_block(trans, root, root->leafsize, + 0, objectid, NULL, 0, 0, 0); if (IS_ERR(leaf)) { ret = PTR_ERR(leaf); goto fail; } - btrfs_set_header_nritems(leaf, 0); - btrfs_set_header_level(leaf, 0); + memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); btrfs_set_header_bytenr(leaf, leaf->start); btrfs_set_header_generation(leaf, trans->transid); + btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); btrfs_set_header_owner(leaf, objectid); write_extent_buffer(leaf, root->fs_info->fsid, (unsigned long)btrfs_header_fsid(leaf), BTRFS_FSID_SIZE); + write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, + (unsigned long)btrfs_header_chunk_tree_uuid(leaf), + BTRFS_UUID_SIZE); btrfs_mark_buffer_dirty(leaf); inode_item = &root_item.inode; @@ -126,18 +303,24 @@ static noinline int create_subvol(struct btrfs_root *root, btrfs_set_root_dirid(&root_item, new_dirid); key.objectid = objectid; - key.offset = 1; + key.offset = 0; btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, &root_item); if (ret) goto fail; + key.offset = (u64)-1; + new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); + BUG_ON(IS_ERR(new_root)); + + btrfs_record_root_in_trans(trans, new_root); + + ret = btrfs_create_subvol_root(trans, new_root, new_dirid, + BTRFS_I(dir)->block_group); /* * insert the directory item */ - key.offset = (u64)-1; - dir = dentry->d_parent->d_inode; ret = btrfs_set_inode_index(dir, &index); BUG_ON(ret); @@ -147,43 +330,24 @@ static noinline int create_subvol(struct btrfs_root *root, if (ret) goto fail; - /* add the backref first */ - ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, - objectid, BTRFS_ROOT_BACKREF_KEY, - root->root_key.objectid, - dir->i_ino, index, name, namelen); - + btrfs_i_size_write(dir, dir->i_size + namelen * 2); + ret = btrfs_update_inode(trans, root, dir); BUG_ON(ret); - /* now add the forward ref */ ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, - root->root_key.objectid, BTRFS_ROOT_REF_KEY, - objectid, + objectid, root->root_key.objectid, dir->i_ino, index, name, namelen); BUG_ON(ret); - ret = btrfs_commit_transaction(trans, root); - if (ret) - goto fail_commit; - - new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); - BUG_ON(!new_root); - - trans = btrfs_start_transaction(new_root, 1); - BUG_ON(!trans); - - ret = btrfs_create_subvol_root(new_root, dentry, trans, new_dirid, - BTRFS_I(dir)->block_group); - if (ret) - goto fail; - + d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); fail: nr = trans->blocks_used; - err = btrfs_commit_transaction(trans, new_root); + err = btrfs_commit_transaction(trans, root); if (err && !ret) ret = err; -fail_commit: + + btrfs_unreserve_metadata_space(root, 6); btrfs_btree_balance_dirty(root, nr); return ret; } @@ -200,19 +364,27 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, if (!root->ref_cows) return -EINVAL; - ret = btrfs_check_free_space(root, 1, 0); + /* + * 1 - inode item + * 2 - refs + * 1 - root item + * 2 - dir items + */ + ret = btrfs_reserve_metadata_space(root, 6); if (ret) goto fail_unlock; pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); if (!pending_snapshot) { ret = -ENOMEM; + btrfs_unreserve_metadata_space(root, 6); goto fail_unlock; } pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); if (!pending_snapshot->name) { ret = -ENOMEM; kfree(pending_snapshot); + btrfs_unreserve_metadata_space(root, 6); goto fail_unlock; } memcpy(pending_snapshot->name, name, namelen); @@ -245,14 +417,15 @@ static inline int btrfs_may_create(struct inode *dir, struct dentry *child) * sys_mkdirat and vfs_mkdir, but we only do a single component lookup * inside this filesystem so it's quite a bit simpler. */ -static noinline int btrfs_mksubvol(struct path *parent, char *name, - int mode, int namelen, +static noinline int btrfs_mksubvol(struct path *parent, + char *name, int namelen, struct btrfs_root *snap_src) { + struct inode *dir = parent->dentry->d_inode; struct dentry *dentry; int error; - mutex_lock_nested(&parent->dentry->d_inode->i_mutex, I_MUTEX_PARENT); + mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); dentry = lookup_one_len(name, parent->dentry, namelen); error = PTR_ERR(dentry); @@ -263,98 +436,40 @@ static noinline int btrfs_mksubvol(struct path *parent, char *name, if (dentry->d_inode) goto out_dput; - if (!IS_POSIXACL(parent->dentry->d_inode)) - mode &= ~current->fs->umask; - error = mnt_want_write(parent->mnt); if (error) goto out_dput; - error = btrfs_may_create(parent->dentry->d_inode, dentry); + error = btrfs_may_create(dir, dentry); if (error) goto out_drop_write; - /* - * Actually perform the low-level subvolume creation after all - * this VFS fuzz. - * - * Eventually we want to pass in an inode under which we create this - * subvolume, but for now all are under the filesystem root. - * - * Also we should pass on the mode eventually to allow creating new - * subvolume with specific mode bits. - */ + down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); + + if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) + goto out_up_read; + if (snap_src) { - struct dentry *dir = dentry->d_parent; - struct dentry *test = dir->d_parent; - struct btrfs_path *path = btrfs_alloc_path(); - int ret; - u64 test_oid; - u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid; - - test_oid = snap_src->root_key.objectid; - - ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, - path, parent_oid, test_oid); - if (ret == 0) - goto create; - btrfs_release_path(snap_src->fs_info->tree_root, path); - - /* we need to make sure we aren't creating a directory loop - * by taking a snapshot of something that has our current - * subvol in its directory tree. So, this loops through - * the dentries and checks the forward refs for each subvolume - * to see if is references the subvolume where we are - * placing this new snapshot. - */ - while(1) { - if (!test || - dir == snap_src->fs_info->sb->s_root || - test == snap_src->fs_info->sb->s_root || - test->d_inode->i_sb != snap_src->fs_info->sb) { - break; - } - if (S_ISLNK(test->d_inode->i_mode)) { - printk("Symlink in snapshot path, failed\n"); - error = -EMLINK; - btrfs_free_path(path); - goto out_drop_write; - } - test_oid = - BTRFS_I(test->d_inode)->root->root_key.objectid; - ret = btrfs_find_root_ref(snap_src->fs_info->tree_root, - path, test_oid, parent_oid); - if (ret == 0) { - printk("Snapshot creation failed, looping\n"); - error = -EMLINK; - btrfs_free_path(path); - goto out_drop_write; - } - btrfs_release_path(snap_src->fs_info->tree_root, path); - test = test->d_parent; - } -create: - btrfs_free_path(path); - error = create_snapshot(snap_src, dentry, name, namelen); + error = create_snapshot(snap_src, dentry, + name, namelen); } else { - error = create_subvol(BTRFS_I(parent->dentry->d_inode)->root, - dentry, name, namelen); + error = create_subvol(BTRFS_I(dir)->root, dentry, + name, namelen); } - if (error) - goto out_drop_write; - - fsnotify_mkdir(parent->dentry->d_inode, dentry); + if (!error) + fsnotify_mkdir(dir, dentry); +out_up_read: + up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); out_drop_write: mnt_drop_write(parent->mnt); out_dput: dput(dentry); out_unlock: - mutex_unlock(&parent->dentry->d_inode->i_mutex); + mutex_unlock(&dir->i_mutex); return error; } - -int btrfs_defrag_file(struct file *file) +static int btrfs_defrag_file(struct file *file) { struct inode *inode = fdentry(file)->d_inode; struct btrfs_root *root = BTRFS_I(inode)->root; @@ -369,7 +484,7 @@ int btrfs_defrag_file(struct file *file) unsigned long i; int ret; - ret = btrfs_check_free_space(root, inode->i_size, 0); + ret = btrfs_check_data_free_space(root, inode, inode->i_size); if (ret) return -ENOSPC; @@ -419,9 +534,8 @@ again: clear_page_dirty_for_io(page); btrfs_set_extent_delalloc(inode, page_start, page_end); - - unlock_extent(io_tree, page_start, page_end, GFP_NOFS); set_page_dirty(page); + unlock_extent(io_tree, page_start, page_end, GFP_NOFS); unlock_page(page); page_cache_release(page); balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); @@ -432,11 +546,8 @@ out_unlock: return 0; } -/* - * Called inside transaction, so use GFP_NOFS - */ - -static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) +static noinline int btrfs_ioctl_resize(struct btrfs_root *root, + void __user *arg) { u64 new_size; u64 old_size; @@ -453,15 +564,12 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) if (root->fs_info->sb->s_flags & MS_RDONLY) return -EROFS; - vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); - - if (!vol_args) - return -ENOMEM; + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; - if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { - ret = -EFAULT; - goto out; - } + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; namelen = strlen(vol_args->name); @@ -475,11 +583,13 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) *devstr = '\0'; devstr = vol_args->name; devid = simple_strtoull(devstr, &end, 10); - printk(KERN_INFO "resizing devid %llu\n", devid); + printk(KERN_INFO "resizing devid %llu\n", + (unsigned long long)devid); } device = btrfs_find_device(root, devid, NULL, NULL); if (!device) { - printk(KERN_INFO "resizer unable to find device %llu\n", devid); + printk(KERN_INFO "resizer unable to find device %llu\n", + (unsigned long long)devid); ret = -EINVAL; goto out_unlock; } @@ -537,7 +647,6 @@ static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) out_unlock: mutex_unlock(&root->fs_info->volume_mutex); -out: kfree(vol_args); return ret; } @@ -547,25 +656,16 @@ static noinline int btrfs_ioctl_snap_create(struct file *file, { struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_vol_args *vol_args; - struct btrfs_dir_item *di; - struct btrfs_path *path; struct file *src_file; - u64 root_dirid; int namelen; int ret = 0; if (root->fs_info->sb->s_flags & MS_RDONLY) return -EROFS; - vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); - - if (!vol_args) - return -ENOMEM; - - if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { - ret = -EFAULT; - goto out; - } + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; namelen = strlen(vol_args->name); @@ -574,32 +674,9 @@ static noinline int btrfs_ioctl_snap_create(struct file *file, goto out; } - path = btrfs_alloc_path(); - if (!path) { - ret = -ENOMEM; - goto out; - } - - root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, - di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, - path, root_dirid, - vol_args->name, namelen, 0); - btrfs_free_path(path); - - if (di && !IS_ERR(di)) { - ret = -EEXIST; - goto out; - } - - if (IS_ERR(di)) { - ret = PTR_ERR(di); - goto out; - } - if (subvol) { - ret = btrfs_mksubvol(&file->f_path, vol_args->name, - file->f_path.dentry->d_inode->i_mode, - namelen, NULL); + ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, + NULL); } else { struct inode *src_inode; src_file = fget(vol_args->fd); @@ -610,22 +687,162 @@ static noinline int btrfs_ioctl_snap_create(struct file *file, src_inode = src_file->f_path.dentry->d_inode; if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { - printk("btrfs: Snapshot src from another FS\n"); + printk(KERN_INFO "btrfs: Snapshot src from " + "another FS\n"); ret = -EINVAL; fput(src_file); goto out; } - ret = btrfs_mksubvol(&file->f_path, vol_args->name, - file->f_path.dentry->d_inode->i_mode, - namelen, BTRFS_I(src_inode)->root); + ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen, + BTRFS_I(src_inode)->root); fput(src_file); } - out: kfree(vol_args); return ret; } +/* + * helper to check if the subvolume references other subvolumes + */ +static noinline int may_destroy_subvol(struct btrfs_root *root) +{ + struct btrfs_path *path; + struct btrfs_key key; + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + key.objectid = root->root_key.objectid; + key.type = BTRFS_ROOT_REF_KEY; + key.offset = (u64)-1; + + ret = btrfs_search_slot(NULL, root->fs_info->tree_root, + &key, path, 0, 0); + if (ret < 0) + goto out; + BUG_ON(ret == 0); + + ret = 0; + if (path->slots[0] > 0) { + path->slots[0]--; + btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); + if (key.objectid == root->root_key.objectid && + key.type == BTRFS_ROOT_REF_KEY) + ret = -ENOTEMPTY; + } +out: + btrfs_free_path(path); + return ret; +} + +static noinline int btrfs_ioctl_snap_destroy(struct file *file, + void __user *arg) +{ + struct dentry *parent = fdentry(file); + struct dentry *dentry; + struct inode *dir = parent->d_inode; + struct inode *inode; + struct btrfs_root *root = BTRFS_I(dir)->root; + struct btrfs_root *dest = NULL; + struct btrfs_ioctl_vol_args *vol_args; + struct btrfs_trans_handle *trans; + int namelen; + int ret; + int err = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); + + vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; + namelen = strlen(vol_args->name); + if (strchr(vol_args->name, '/') || + strncmp(vol_args->name, "..", namelen) == 0) { + err = -EINVAL; + goto out; + } + + err = mnt_want_write(file->f_path.mnt); + if (err) + goto out; + + mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); + dentry = lookup_one_len(vol_args->name, parent, namelen); + if (IS_ERR(dentry)) { + err = PTR_ERR(dentry); + goto out_unlock_dir; + } + + if (!dentry->d_inode) { + err = -ENOENT; + goto out_dput; + } + + inode = dentry->d_inode; + if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { + err = -EINVAL; + goto out_dput; + } + + dest = BTRFS_I(inode)->root; + + mutex_lock(&inode->i_mutex); + err = d_invalidate(dentry); + if (err) + goto out_unlock; + + down_write(&root->fs_info->subvol_sem); + + err = may_destroy_subvol(dest); + if (err) + goto out_up_write; + + trans = btrfs_start_transaction(root, 1); + ret = btrfs_unlink_subvol(trans, root, dir, + dest->root_key.objectid, + dentry->d_name.name, + dentry->d_name.len); + BUG_ON(ret); + + btrfs_record_root_in_trans(trans, dest); + + memset(&dest->root_item.drop_progress, 0, + sizeof(dest->root_item.drop_progress)); + dest->root_item.drop_level = 0; + btrfs_set_root_refs(&dest->root_item, 0); + + ret = btrfs_insert_orphan_item(trans, + root->fs_info->tree_root, + dest->root_key.objectid); + BUG_ON(ret); + + ret = btrfs_commit_transaction(trans, root); + BUG_ON(ret); + inode->i_flags |= S_DEAD; +out_up_write: + up_write(&root->fs_info->subvol_sem); +out_unlock: + mutex_unlock(&inode->i_mutex); + if (!err) { + btrfs_invalidate_inodes(dest); + d_delete(dentry); + } +out_dput: + dput(dentry); +out_unlock_dir: + mutex_unlock(&dir->i_mutex); + mnt_drop_write(file->f_path.mnt); +out: + kfree(vol_args); + return err; +} + static int btrfs_ioctl_defrag(struct file *file) { struct inode *inode = fdentry(file)->d_inode; @@ -638,66 +855,69 @@ static int btrfs_ioctl_defrag(struct file *file) switch (inode->i_mode & S_IFMT) { case S_IFDIR: + if (!capable(CAP_SYS_ADMIN)) { + ret = -EPERM; + goto out; + } btrfs_defrag_root(root, 0); btrfs_defrag_root(root->fs_info->extent_root, 0); break; case S_IFREG: + if (!(file->f_mode & FMODE_WRITE)) { + ret = -EINVAL; + goto out; + } btrfs_defrag_file(file); break; } - - return 0; +out: + mnt_drop_write(file->f_path.mnt); + return ret; } -long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) { struct btrfs_ioctl_vol_args *vol_args; int ret; - vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; - if (!vol_args) - return -ENOMEM; + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); - if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { - ret = -EFAULT; - goto out; - } vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; ret = btrfs_init_new_device(root, vol_args->name); -out: kfree(vol_args); return ret; } -long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) { struct btrfs_ioctl_vol_args *vol_args; int ret; + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (root->fs_info->sb->s_flags & MS_RDONLY) return -EROFS; - vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); + vol_args = memdup_user(arg, sizeof(*vol_args)); + if (IS_ERR(vol_args)) + return PTR_ERR(vol_args); - if (!vol_args) - return -ENOMEM; - - if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { - ret = -EFAULT; - goto out; - } vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; ret = btrfs_rm_device(root, vol_args->name); -out: kfree(vol_args); return ret; } -long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, - u64 olen, u64 destoff) +static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, + u64 off, u64 olen, u64 destoff) { struct inode *inode = fdentry(file)->d_inode; struct btrfs_root *root = BTRFS_I(inode)->root; @@ -725,13 +945,19 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, * they don't overlap)? */ + /* the destination must be opened for writing */ + if (!(file->f_mode & FMODE_WRITE)) + return -EINVAL; + ret = mnt_want_write(file->f_path.mnt); if (ret) return ret; src_file = fget(srcfd); - if (!src_file) - return -EBADF; + if (!src_file) { + ret = -EBADF; + goto out_drop_write; + } src = src_file->f_dentry->d_inode; ret = -EINVAL; @@ -782,9 +1008,6 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, ((off + len) & (bs-1))) goto out_unlock; - printk("final src extent is %llu~%llu\n", off, len); - printk("final dst extent is %llu~%llu\n", destoff, len); - /* do any pending delalloc/csum calc on src, one way or another, and lock file content */ while (1) { @@ -803,7 +1026,8 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, BUG_ON(!trans); /* punch hole in destination first */ - btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte); + btrfs_drop_extents(trans, root, inode, off, off + len, + off + len, 0, &hint_byte, 1); /* clone data */ key.objectid = src->i_ino; @@ -832,7 +1056,7 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, slot = path->slots[0]; btrfs_item_key_to_cpu(leaf, &key, slot); - if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || + if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || key.objectid != src->i_ino) break; @@ -854,11 +1078,15 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, struct btrfs_file_extent_item); comp = btrfs_file_extent_compression(leaf, extent); type = btrfs_file_extent_type(leaf, extent); - if (type == BTRFS_FILE_EXTENT_REG) { - disko = btrfs_file_extent_disk_bytenr(leaf, extent); - diskl = btrfs_file_extent_disk_num_bytes(leaf, extent); + if (type == BTRFS_FILE_EXTENT_REG || + type == BTRFS_FILE_EXTENT_PREALLOC) { + disko = btrfs_file_extent_disk_bytenr(leaf, + extent); + diskl = btrfs_file_extent_disk_num_bytes(leaf, + extent); datao = btrfs_file_extent_offset(leaf, extent); - datal = btrfs_file_extent_num_bytes(leaf, extent); + datal = btrfs_file_extent_num_bytes(leaf, + extent); } else if (type == BTRFS_FILE_EXTENT_INLINE) { /* take upper bound, may be compressed */ datal = btrfs_file_extent_ram_bytes(leaf, @@ -874,7 +1102,8 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, new_key.objectid = inode->i_ino; new_key.offset = key.offset + destoff - off; - if (type == BTRFS_FILE_EXTENT_REG) { + if (type == BTRFS_FILE_EXTENT_REG || + type == BTRFS_FILE_EXTENT_PREALLOC) { ret = btrfs_insert_empty_item(trans, root, path, &new_key, size); if (ret) @@ -888,21 +1117,16 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, extent = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); - printk(" orig disk %llu~%llu data %llu~%llu\n", - disko, diskl, datao, datal); if (off > key.offset) { datao += off - key.offset; datal -= off - key.offset; } - if (key.offset + datao + datal + key.offset > - off + len) + if (key.offset + datao + datal > off + len) datal = off + len - key.offset - datao; /* disko == 0 means it's a hole */ if (!disko) datao = 0; - printk(" final disk %llu~%llu data %llu~%llu\n", - disko, diskl, datao, datal); btrfs_set_file_extent_offset(leaf, extent, datao); @@ -911,10 +1135,10 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, if (disko) { inode_add_bytes(inode, datal); ret = btrfs_inc_extent_ref(trans, root, - disko, diskl, leaf->start, - root->root_key.objectid, - trans->transid, - inode->i_ino); + disko, diskl, 0, + root->root_key.objectid, + inode->i_ino, + new_key.offset - datao); BUG_ON(ret); } } else if (type == BTRFS_FILE_EXTENT_INLINE) { @@ -924,12 +1148,11 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, skip = off - key.offset; new_key.offset += skip; } + if (key.offset + datal > off+len) trim = key.offset + datal - (off+len); - printk("len %lld skip %lld trim %lld\n", - datal, skip, trim); + if (comp && (skip || trim)) { - printk("btrfs clone_range can't split compressed inline extents yet\n"); ret = -EINVAL; goto out; } @@ -941,7 +1164,8 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, goto out; if (skip) { - u32 start = btrfs_file_extent_calc_inline_size(0); + u32 start = + btrfs_file_extent_calc_inline_size(0); memmove(buf+start, buf+start+skip, datal); } @@ -957,57 +1181,7 @@ long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off, btrfs_mark_buffer_dirty(leaf); } - if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { - u32 size; - struct btrfs_key new_key; - u64 coverslen; - int coff, clen; - - size = btrfs_item_size_nr(leaf, slot); - coverslen = (size / BTRFS_CRC32_SIZE) << - root->fs_info->sb->s_blocksize_bits; - printk("csums for %llu~%llu\n", - key.offset, coverslen); - if (key.offset + coverslen < off || - key.offset >= off+len) - goto next; - - read_extent_buffer(leaf, buf, - btrfs_item_ptr_offset(leaf, slot), - size); - btrfs_release_path(root, path); - - coff = 0; - if (off > key.offset) - coff = ((off - key.offset) >> - root->fs_info->sb->s_blocksize_bits) * - BTRFS_CRC32_SIZE; - clen = size - coff; - if (key.offset + coverslen > off+len) - clen -= ((key.offset+coverslen-off-len) >> - root->fs_info->sb->s_blocksize_bits) * - BTRFS_CRC32_SIZE; - printk(" will dup %d~%d of %d\n", - coff, clen, size); - - memcpy(&new_key, &key, sizeof(new_key)); - new_key.objectid = inode->i_ino; - new_key.offset = key.offset + destoff - off; - - ret = btrfs_insert_empty_item(trans, root, path, - &new_key, clen); - if (ret) - goto out; - - leaf = path->nodes[0]; - slot = path->slots[0]; - write_extent_buffer(leaf, buf + coff, - btrfs_item_ptr_offset(leaf, slot), - clen); - btrfs_mark_buffer_dirty(leaf); - } - - next: +next: btrfs_release_path(root, path); key.offset++; } @@ -1032,14 +1206,16 @@ out_unlock: btrfs_free_path(path); out_fput: fput(src_file); +out_drop_write: + mnt_drop_write(file->f_path.mnt); return ret; } -long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr) +static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) { struct btrfs_ioctl_clone_range_args args; - if (copy_from_user(&args, (void *)argptr, sizeof(args))) + if (copy_from_user(&args, argp, sizeof(args))) return -EFAULT; return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, args.src_length, args.dest_offset); @@ -1051,7 +1227,7 @@ long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr) * basically own the machine, and have a very in depth understanding * of all the possible deadlocks and enospc problems. */ -long btrfs_ioctl_trans_start(struct file *file) +static long btrfs_ioctl_trans_start(struct file *file) { struct inode *inode = fdentry(file)->d_inode; struct btrfs_root *root = BTRFS_I(inode)->root; @@ -1109,6 +1285,8 @@ long btrfs_ioctl_trans_end(struct file *file) root->fs_info->open_ioctl_trans--; mutex_unlock(&root->fs_info->trans_mutex); + mnt_drop_write(file->f_path.mnt); + out: return ret; } @@ -1117,26 +1295,35 @@ long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; + void __user *argp = (void __user *)arg; switch (cmd) { + case FS_IOC_GETFLAGS: + return btrfs_ioctl_getflags(file, argp); + case FS_IOC_SETFLAGS: + return btrfs_ioctl_setflags(file, argp); + case FS_IOC_GETVERSION: + return btrfs_ioctl_getversion(file, argp); case BTRFS_IOC_SNAP_CREATE: - return btrfs_ioctl_snap_create(file, (void __user *)arg, 0); + return btrfs_ioctl_snap_create(file, argp, 0); case BTRFS_IOC_SUBVOL_CREATE: - return btrfs_ioctl_snap_create(file, (void __user *)arg, 1); + return btrfs_ioctl_snap_create(file, argp, 1); + case BTRFS_IOC_SNAP_DESTROY: + return btrfs_ioctl_snap_destroy(file, argp); case BTRFS_IOC_DEFRAG: return btrfs_ioctl_defrag(file); case BTRFS_IOC_RESIZE: - return btrfs_ioctl_resize(root, (void __user *)arg); + return btrfs_ioctl_resize(root, argp); case BTRFS_IOC_ADD_DEV: - return btrfs_ioctl_add_dev(root, (void __user *)arg); + return btrfs_ioctl_add_dev(root, argp); case BTRFS_IOC_RM_DEV: - return btrfs_ioctl_rm_dev(root, (void __user *)arg); + return btrfs_ioctl_rm_dev(root, argp); case BTRFS_IOC_BALANCE: return btrfs_balance(root->fs_info->dev_root); case BTRFS_IOC_CLONE: return btrfs_ioctl_clone(file, arg, 0, 0, 0); case BTRFS_IOC_CLONE_RANGE: - return btrfs_ioctl_clone_range(file, arg); + return btrfs_ioctl_clone_range(file, argp); case BTRFS_IOC_TRANS_START: return btrfs_ioctl_trans_start(file); case BTRFS_IOC_TRANS_END: