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Ts'o " , Jaegeuk Kim , Eric Biggers , linux-fscrypt@vger.kernel.org, linux-btrfs@vger.kernel.org, kernel-team@fb.com Cc: Sweet Tea Dorminy Subject: [PATCH 08/21] btrfs: setup fscrypt_names from dentrys using helper Date: Wed, 17 Aug 2022 10:49:52 -0400 Message-Id: <33ab6691c8038f52a448844f0ebc363477db30da.1660744500.git.sweettea-kernel@dorminy.me> In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Most places that we create fscrypt_names, we are doing so from a dentry. Fscrypt provides a helper for this common pattern: fscrypt_setup_filename() initializes a filename to search for from a dentry, performing encryption of the plaintext if it can and should be done. This converts each setup of a fscrypt_name from a dentry to use this helper; at present, since there are no encrypted directories, nothing goes down the filename encryption paths. Signed-off-by: Sweet Tea Dorminy --- fs/btrfs/inode.c | 153 ++++++++++++++++++++++++++--------------- fs/btrfs/transaction.c | 26 +++++-- fs/btrfs/tree-log.c | 12 ++-- 3 files changed, 123 insertions(+), 68 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index dbb2ef802b9a..f3861c58309a 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4408,14 +4408,17 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry) struct btrfs_trans_handle *trans; struct inode *inode = d_inode(dentry); int ret; - struct fscrypt_name fname = { - .disk_name = FSTR_INIT((unsigned char *)dentry->d_name.name, dentry->d_name.len) - }; + struct fscrypt_name fname; + ret = fscrypt_setup_filename(dir, &dentry->d_name, 1, &fname); + if (ret) + return ret; trans = __unlink_start_trans(dir); - if (IS_ERR(trans)) - return PTR_ERR(trans); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } btrfs_record_unlink_dir(trans, BTRFS_I(dir), BTRFS_I(d_inode(dentry)), 0); @@ -4432,6 +4435,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry) } out: + fscrypt_free_filename(&fname); btrfs_end_transaction(trans); btrfs_btree_balance_dirty(BTRFS_I(dir)->root->fs_info); return ret; @@ -4450,10 +4454,11 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, int ret; u64 objectid; u64 dir_ino = btrfs_ino(BTRFS_I(dir)); - struct fscrypt_name fname = { - .disk_name = FSTR_INIT((char *) dentry->d_name.name, - dentry->d_name.len) - }; + struct fscrypt_name fname; + + ret = fscrypt_setup_filename(dir, &dentry->d_name, 1, &fname); + if (ret) + return ret; if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) { objectid = inode->root->root_key.objectid; @@ -4461,12 +4466,15 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, objectid = inode->location.objectid; } else { WARN_ON(1); + fscrypt_free_filename(&fname); return -EINVAL; } path = btrfs_alloc_path(); - if (!path) - return -ENOMEM; + if (!path) { + ret = -ENOMEM; + goto out; + } di = btrfs_lookup_dir_item(trans, root, path, dir_ino, &fname, -1); if (IS_ERR_OR_NULL(di)) { @@ -4533,6 +4541,7 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, btrfs_abort_transaction(trans, ret); out: btrfs_free_path(path); + fscrypt_free_filename(&fname); return ret; } @@ -4799,9 +4808,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) int err = 0; struct btrfs_trans_handle *trans; u64 last_unlink_trans; - struct fscrypt_name fname = { - .disk_name = FSTR_INIT((unsigned char *)dentry->d_name.name, dentry->d_name.len) - }; + struct fscrypt_name fname; if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) return -ENOTEMPTY; @@ -4814,9 +4821,15 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) return btrfs_delete_subvolume(dir, dentry); } + err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &fname); + if (err) + return err; + trans = __unlink_start_trans(dir); - if (IS_ERR(trans)) - return PTR_ERR(trans); + if (IS_ERR(trans)) { + err = PTR_ERR(trans); + goto out_notrans; + } if (unlikely(btrfs_ino(BTRFS_I(inode)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { err = btrfs_unlink_subvol(trans, dir, dentry); @@ -4850,7 +4863,9 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) } out: btrfs_end_transaction(trans); +out_notrans: btrfs_btree_balance_dirty(fs_info); + fscrypt_free_filename(&fname); return err; } @@ -5544,7 +5559,7 @@ void btrfs_evict_inode(struct inode *inode) /* * Return the key found in the dir entry in the location pointer, fill @type - * with BTRFS_FT_*, and return 0. + * with BTRFS_FT_*, and return 0. Used only for lookups, not removals. * * If no dir entries were found, returns -ENOENT. * If found a corrupted location in dir entry, returns -EUCLEAN. @@ -5556,15 +5571,16 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, struct btrfs_path *path; struct btrfs_root *root = BTRFS_I(dir)->root; int ret = 0; - struct fscrypt_name fname = { - .disk_name = FSTR_INIT((char *) dentry->d_name.name, - dentry->d_name.len) - }; + struct fscrypt_name fname; path = btrfs_alloc_path(); if (!path) return -ENOMEM; + ret = fscrypt_setup_filename(dir, &dentry->d_name, 1, &fname); + if (ret) + goto out; + di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(BTRFS_I(dir)), &fname, 0); if (IS_ERR_OR_NULL(di)) { @@ -5584,6 +5600,7 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, if (!ret) *type = btrfs_dir_ftype(path->nodes[0], di); out: + fscrypt_free_filename(&fname); btrfs_free_path(path); return ret; } @@ -5604,9 +5621,15 @@ static int fixup_tree_root_location(struct btrfs_fs_info *fs_info, struct btrfs_root_ref *ref; struct extent_buffer *leaf; struct btrfs_key key; + struct fscrypt_name fname; int ret; int err = 0; + ret = fscrypt_setup_filename(dir, &dentry->d_name, 0, + &fname); + if (ret) + return ret; + path = btrfs_alloc_path(); if (!path) { err = -ENOMEM; @@ -5652,6 +5675,7 @@ static int fixup_tree_root_location(struct btrfs_fs_info *fs_info, err = 0; out: btrfs_free_path(path); + fscrypt_free_filename(&fname); return err; } @@ -6258,16 +6282,17 @@ int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args, struct inode *inode = args->inode; int ret; + if (!args->orphan) { + ret = fscrypt_setup_filename(dir, &args->dentry->d_name, 0, + &args->fname); + if (ret) + return ret; + } + ret = posix_acl_create(dir, &inode->i_mode, &args->default_acl, &args->acl); - if (ret) + if (ret) { + fscrypt_free_filename(&args->fname); return ret; - - if (!args->orphan) { - char *name = (char *) args->dentry->d_name.name; - int name_len = args->dentry->d_name.len; - args->fname = (struct fscrypt_name) { - .disk_name = FSTR_INIT(name, name_len), - }; } /* 1 to add inode item */ @@ -6308,6 +6333,7 @@ void btrfs_new_inode_args_destroy(struct btrfs_new_inode_args *args) { posix_acl_release(args->acl); posix_acl_release(args->default_acl); + fscrypt_free_filename(&args->fname); } /* @@ -6735,10 +6761,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir, struct btrfs_root *root = BTRFS_I(dir)->root; struct inode *inode = d_inode(old_dentry); struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); - struct fscrypt_name fname = { - .disk_name = FSTR_INIT((char *) dentry->d_name.name, - dentry->d_name.len) - }; + struct fscrypt_name fname; u64 index; int err; int drop_inode = 0; @@ -6750,6 +6773,10 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir, if (inode->i_nlink >= BTRFS_LINK_MAX) return -EMLINK; + err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &fname); + if (err) + goto fail; + err = btrfs_set_inode_index(BTRFS_I(dir), &index); if (err) goto fail; @@ -6800,6 +6827,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir, } fail: + fscrypt_free_filename(&fname); if (trans) btrfs_end_transaction(trans); if (drop_inode) { @@ -9181,14 +9209,7 @@ static int btrfs_rename_exchange(struct inode *old_dir, int ret; int ret2; bool need_abort = false; - struct fscrypt_name old_name = { - .disk_name = FSTR_INIT((char *) old_dentry->d_name.name, - old_dentry->d_name.len) - }; - struct fscrypt_name new_name = { - .disk_name = FSTR_INIT((char *) new_dentry->d_name.name, - new_dentry->d_name.len) - }; + struct fscrypt_name old_fname, new_fname; /* * For non-subvolumes allow exchange only within one subvolume, in the @@ -9200,6 +9221,16 @@ static int btrfs_rename_exchange(struct inode *old_dir, new_ino != BTRFS_FIRST_FREE_OBJECTID)) return -EXDEV; + ret = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_fname); + if (ret) + return ret; + + ret = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_fname); + if (ret) { + fscrypt_free_filename(&old_fname); + return ret; + } + /* close the race window with snapshot create/destroy ioctl */ if (old_ino == BTRFS_FIRST_FREE_OBJECTID || new_ino == BTRFS_FIRST_FREE_OBJECTID) @@ -9267,7 +9298,7 @@ static int btrfs_rename_exchange(struct inode *old_dir, /* force full log commit if subvolume involved. */ btrfs_set_log_full_commit(trans); } else { - ret = btrfs_insert_inode_ref(trans, dest, &new_name, old_ino, + ret = btrfs_insert_inode_ref(trans, dest, &new_fname, old_ino, btrfs_ino(BTRFS_I(new_dir)), old_idx); if (ret) @@ -9280,7 +9311,7 @@ static int btrfs_rename_exchange(struct inode *old_dir, /* force full log commit if subvolume involved. */ btrfs_set_log_full_commit(trans); } else { - ret = btrfs_insert_inode_ref(trans, root, &old_name, new_ino, + ret = btrfs_insert_inode_ref(trans, root, &old_fname, new_ino, btrfs_ino(BTRFS_I(old_dir)), new_idx); if (ret) { @@ -9314,7 +9345,7 @@ static int btrfs_rename_exchange(struct inode *old_dir, ret = btrfs_unlink_subvol(trans, old_dir, old_dentry); } else { /* src is an inode */ ret = __btrfs_unlink_inode(trans, BTRFS_I(old_dir), - BTRFS_I(old_dentry->d_inode), &old_name, + BTRFS_I(old_dentry->d_inode), &old_fname, &old_rename_ctx); if (!ret) ret = btrfs_update_inode(trans, root, BTRFS_I(old_inode)); @@ -9329,7 +9360,7 @@ static int btrfs_rename_exchange(struct inode *old_dir, ret = btrfs_unlink_subvol(trans, new_dir, new_dentry); } else { /* dest is an inode */ ret = __btrfs_unlink_inode(trans, BTRFS_I(new_dir), - BTRFS_I(new_dentry->d_inode), &new_name, + BTRFS_I(new_dentry->d_inode), &new_fname, &new_rename_ctx); if (!ret) ret = btrfs_update_inode(trans, dest, BTRFS_I(new_inode)); @@ -9340,14 +9371,14 @@ static int btrfs_rename_exchange(struct inode *old_dir, } ret = btrfs_add_link(trans, BTRFS_I(new_dir), BTRFS_I(old_inode), - &new_name, 0, old_idx); + &new_fname, 0, old_idx); if (ret) { btrfs_abort_transaction(trans, ret); goto out_fail; } ret = btrfs_add_link(trans, BTRFS_I(old_dir), BTRFS_I(new_inode), - &old_name, 0, new_idx); + &old_fname, 0, new_idx); if (ret) { btrfs_abort_transaction(trans, ret); goto out_fail; @@ -9390,6 +9421,8 @@ static int btrfs_rename_exchange(struct inode *old_dir, old_ino == BTRFS_FIRST_FREE_OBJECTID) up_read(&fs_info->subvol_sem); + fscrypt_free_filename(&new_fname); + fscrypt_free_filename(&old_fname); return ret; } @@ -9429,14 +9462,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns, int ret; int ret2; u64 old_ino = btrfs_ino(BTRFS_I(old_inode)); - struct fscrypt_name old_fname = { - .disk_name = FSTR_INIT((char *)old_dentry->d_name.name, - old_dentry->d_name.len) - }; - struct fscrypt_name new_fname = { - .disk_name = FSTR_INIT((char *)new_dentry->d_name.name, - new_dentry->d_name.len) - }; + struct fscrypt_name old_fname, new_fname; if (btrfs_ino(BTRFS_I(new_dir)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) return -EPERM; @@ -9453,6 +9479,16 @@ static int btrfs_rename(struct user_namespace *mnt_userns, new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) return -ENOTEMPTY; + ret = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_fname); + if (ret) + return ret; + + ret = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_fname); + if (ret) { + fscrypt_free_filename(&old_fname); + return ret; + } + /* check for collisions, even if the name isn't there */ ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino, &new_fname); @@ -9461,11 +9497,11 @@ static int btrfs_rename(struct user_namespace *mnt_userns, /* we shouldn't get * eexist without a new_inode */ if (WARN_ON(!new_inode)) { - return ret; + goto out_fscrypt_names; } } else { /* maybe -EOVERFLOW */ - return ret; + goto out_fscrypt_names; } } ret = 0; @@ -9639,6 +9675,9 @@ static int btrfs_rename(struct user_namespace *mnt_userns, out_whiteout_inode: if (flags & RENAME_WHITEOUT) iput(whiteout_args.inode); +out_fscrypt_names: + fscrypt_free_filename(&old_fname); + fscrypt_free_filename(&new_fname); return ret; } diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 3d1459dccc8d..c95cd917b54f 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -1660,10 +1661,8 @@ create_pending_snapshot(struct btrfs_trans_handle *trans, u64 index = 0; u64 objectid; u64 root_flags; - struct fscrypt_name fname = { - .disk_name = FSTR_INIT((char *) pending->dentry->d_name.name, - pending->dentry->d_name.len) - }; + unsigned int mem_flags; + struct fscrypt_name fname; ASSERT(pending->path); path = pending->path; @@ -1671,9 +1670,22 @@ create_pending_snapshot(struct btrfs_trans_handle *trans, ASSERT(pending->root_item); new_root_item = pending->root_item; + /* + * Since this is during btrfs_commit_transaction() and more items + * joining the transaction at this point would be bad, use NOFS + * allocations so that no new writes are kicked off. + */ + mem_flags = memalloc_nofs_save(); + pending->error = fscrypt_setup_filename(parent_inode, + &pending->dentry->d_name, 0, + &fname); + memalloc_nofs_restore(mem_flags); + if (pending->error) + goto free_pending; + pending->error = btrfs_get_free_objectid(tree_root, &objectid); if (pending->error) - goto no_free_objectid; + goto free_fname; /* * Make qgroup to skip current new snapshot's qgroupid, as it is @@ -1887,7 +1899,9 @@ create_pending_snapshot(struct btrfs_trans_handle *trans, trans->bytes_reserved = 0; clear_skip_qgroup: btrfs_clear_skip_qgroup(trans); -no_free_objectid: +free_fname: + fscrypt_free_filename(&fname); +free_pending: kfree(new_root_item); pending->root_item = NULL; btrfs_free_path(path); diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 0cd515e02fe4..ee7b80d953e9 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -6906,13 +6906,13 @@ void btrfs_log_new_name(struct btrfs_trans_handle *trans, if (old_dir && old_dir->logged_trans == trans->transid) { struct btrfs_root *log = old_dir->root->log_root; struct btrfs_path *path; - struct fscrypt_name fname = { - .disk_name = FSTR_INIT((char *) old_dentry->d_name.name, - old_dentry->d_name.len) - }; - + struct fscrypt_name fname; ASSERT(old_dir_index >= BTRFS_DIR_START_INDEX); + ret = fscrypt_setup_filename(&old_dir->vfs_inode, + &old_dentry->d_name, 0, &fname); + if (ret) + goto out; /* * We have two inodes to update in the log, the old directory and * the inode that got renamed, so we must pin the log to prevent @@ -6932,6 +6932,7 @@ void btrfs_log_new_name(struct btrfs_trans_handle *trans, path = btrfs_alloc_path(); if (!path) { ret = -ENOMEM; + fscrypt_free_filename(&fname); goto out; } @@ -6961,6 +6962,7 @@ void btrfs_log_new_name(struct btrfs_trans_handle *trans, mutex_unlock(&old_dir->log_mutex); btrfs_free_path(path); + fscrypt_free_filename(&fname); if (ret < 0) goto out; }