From patchwork Wed Jul 13 10:29:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sweet Tea Dorminy X-Patchwork-Id: 12916516 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 566B4CCA479 for ; Wed, 13 Jul 2022 10:30:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236042AbiGMKa4 (ORCPT ); Wed, 13 Jul 2022 06:30:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236034AbiGMKax (ORCPT ); Wed, 13 Jul 2022 06:30:53 -0400 Received: from box.fidei.email (box.fidei.email [IPv6:2605:2700:0:2:a800:ff:feba:dc44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90CBBFC989 for ; Wed, 13 Jul 2022 03:30:51 -0700 (PDT) Received: from authenticated-user (box.fidei.email [71.19.144.250]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by box.fidei.email (Postfix) with ESMTPSA id 8F1D28111E; Wed, 13 Jul 2022 06:30:49 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=dorminy.me; s=mail; t=1657708251; bh=4uqpGo8qy3Bvwxt2inUNeCmG/GdZeE2uhg525J81V0A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cYOpfLxBLOLSR9zAoT2dhOO8YO85yDvHPb05f+XrSvHNhJ6ZU3/Uo9im0lNPYtLz0 9uWYr4LACkxgxVYSH8lGQ4XDXcXE6ybp6P4OdLmrZd4TM0g9VeMGUup1usWwwmGGOs +cDAe0CeGKO0yBdviM1A8jO7l2EhECPI4Ut2hFAa3aXeBjDUzO3DK8Ve00jXO0lKlk wWYaOqA5h/agdQfzAdANCvnYOfGw7X5RHMjpP70bQQaO51U4+oATSWLGqUvjzy1u8g 7MfxZr6hhz/50wHh/E7IG0adwtjz7Oh9AktZsapMGB8SO6Szv+vzwaGLTB8O5CSi8n TBwTEGCQBt7Dg== From: Sweet Tea Dorminy To: Chris Mason , Josef Bacik , David Sterba , linux-btrfs@vger.kernel.org Cc: Sweet Tea Dorminy Subject: [RFC ONLY 07/23] btrfs: setup fscrypt_names from dentrys using helper Date: Wed, 13 Jul 2022 06:29:40 -0400 Message-Id: <8386fc3358d47243a7fbbf7cb957bc7ed8f342b5.1657707687.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 | 151 ++++++++++++++++++++++++++--------------- fs/btrfs/transaction.c | 26 +++++-- fs/btrfs/tree-log.c | 12 ++-- 3 files changed, 123 insertions(+), 66 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 27742237ac7d..ad556e8d5dac 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4411,14 +4411,17 @@ 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); @@ -4435,6 +4438,7 @@ 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; @@ -4453,9 +4457,11 @@ 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(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; @@ -4463,12 +4469,15 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, objectid = inode->location.objectid; } else { WARN_ON(1); + fscrypt_free_fname(&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)) { @@ -4535,6 +4544,7 @@ 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; } @@ -4801,9 +4811,7 @@ 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; @@ -4816,9 +4824,15 @@ 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); @@ -4852,7 +4866,9 @@ 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; } @@ -5547,7 +5563,7 @@ 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. @@ -5559,14 +5575,16 @@ 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(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)) { @@ -5586,6 +5604,7 @@ 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; } @@ -5606,9 +5625,15 @@ 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; @@ -5654,6 +5679,7 @@ 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; } @@ -6260,16 +6286,17 @@ 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_fname(&args->fname); return ret; - - if (!args->orphan) { - const char *name = 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 */ @@ -6310,6 +6337,7 @@ 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); } /* @@ -6737,10 +6765,7 @@ 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(dentry->d_name.name, - dentry->d_name.len) - }; + struct fscrypt_name fname; u64 index; int err; int drop_inode = 0; @@ -6752,6 +6777,10 @@ 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; @@ -6802,6 +6831,7 @@ 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) { @@ -9169,14 +9199,7 @@ 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(old_dentry->d_name.name, - old_dentry->d_name.len) - }; - struct fscrypt_name new_name = { - .disk_name = FSTR_INIT(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 @@ -9188,6 +9211,16 @@ 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) @@ -9255,7 +9288,7 @@ 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) @@ -9268,7 +9301,7 @@ 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) { @@ -9302,7 +9335,7 @@ 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)); @@ -9317,7 +9350,7 @@ 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)); @@ -9328,14 +9361,14 @@ 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; @@ -9378,6 +9411,8 @@ 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; } @@ -9417,14 +9452,7 @@ 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(old_dentry->d_name.name, - old_dentry->d_name.len) - }; - struct fscrypt_name new_fname = { - .disk_name = FSTR_INIT(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; @@ -9441,6 +9469,16 @@ 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); @@ -9449,11 +9487,11 @@ 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; @@ -9627,6 +9665,9 @@ 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 4ef6299af949..ac3121068461 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -1624,10 +1625,8 @@ create_pending_snapshot(struct btrfs_trans_handle *trans, u64 index = 0; u64 objectid; u64 root_flags; - struct fscrypt_name fname = { - .disk_name = FSTR_INIT(pending->dentry->d_name.name, - pending->dentry->d_name.len) - }; + unsigned int mem_flags; + struct fscrypt_name fname; ASSERT(pending->path); path = pending->path; @@ -1635,9 +1634,22 @@ 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 @@ -1852,7 +1864,9 @@ 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 118ab4f5bb11..4959e8ecc99a 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -7033,13 +7033,13 @@ 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(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 @@ -7052,6 +7052,7 @@ void btrfs_log_new_name(struct btrfs_trans_handle *trans, path = btrfs_alloc_path(); if (!path) { ret = -ENOMEM; + fscrypt_free_filename(&fname); goto out; } @@ -7081,6 +7082,7 @@ 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; }