From patchwork Thu Sep 17 04:11:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 11781479 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BC064618 for ; Thu, 17 Sep 2020 04:21:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A25252075E for ; Thu, 17 Sep 2020 04:21:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600316461; bh=b+br3C3cbfnBLBIC6l48f9MznNCXZDVFxP9oBuV6fkI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lYue2wxaECaaeiKThHTDNmmu1azNwu71Ne6O+roEn9p/XsVb8Pb+hrLSmZ5D48mNA M9IPMAQsA2Xt4r4B+6yEEfXZ5OyrLeCWWS0GG/zHZgji6pPvD2brZraOm0bfSxmhMt iu8YZMckFiZ1l3BuxE+G/dkA8JyfQi4/Qhkj8m08= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726279AbgIQEU6 (ORCPT ); Thu, 17 Sep 2020 00:20:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:33844 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726156AbgIQEUv (ORCPT ); Thu, 17 Sep 2020 00:20:51 -0400 Received: from sol.attlocal.net (172-10-235-113.lightspeed.sntcca.sbcglobal.net [172.10.235.113]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BB72121973; Thu, 17 Sep 2020 04:13:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600315988; bh=b+br3C3cbfnBLBIC6l48f9MznNCXZDVFxP9oBuV6fkI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZU8LAn6Ou/W4N6ND26oun8qG5aZepZ6dTFMZDxiaRflydZRTsHZ35RWxtI5H1+IQl jmabDjvBJmMyQLQLBdXsgOZF4nY7Q7UNVBsq4RqsPzZiP4praeOA9Jzs90s2IcJ8eS +dfaFJXD+as/p7uWPMk6QpIGUokQ9QuvJWYc1YoM= From: Eric Biggers To: linux-fscrypt@vger.kernel.org Cc: linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mtd@lists.infradead.org, ceph-devel@vger.kernel.org, Jeff Layton , Daniel Rosenberg Subject: [PATCH v3 03/13] ext4: use fscrypt_prepare_new_inode() and fscrypt_set_context() Date: Wed, 16 Sep 2020 21:11:26 -0700 Message-Id: <20200917041136.178600-4-ebiggers@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200917041136.178600-1-ebiggers@kernel.org> References: <20200917041136.178600-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Eric Biggers Convert ext4 to use the new functions fscrypt_prepare_new_inode() and fscrypt_set_context(). This avoids calling fscrypt_get_encryption_info() from within a transaction, which can deadlock because fscrypt_get_encryption_info() isn't GFP_NOFS-safe. For more details about this problem, see the earlier patch "fscrypt: add fscrypt_prepare_new_inode() and fscrypt_set_context()". Signed-off-by: Eric Biggers --- fs/ext4/ialloc.c | 37 +++++++++++++++++-------------------- 1 file changed, 17 insertions(+), 20 deletions(-) diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 0cc576005a923..698ca4a4db5f7 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -819,7 +819,7 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, ext4_group_t i; ext4_group_t flex_group; struct ext4_group_info *grp; - int encrypt = 0; + bool encrypt = false; /* Cannot create files in a deleted directory */ if (!dir || !dir->i_nlink) @@ -831,24 +831,6 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, if (unlikely(ext4_forced_shutdown(sbi))) return ERR_PTR(-EIO); - if ((IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) && - (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) && - !(i_flags & EXT4_EA_INODE_FL)) { - err = fscrypt_get_encryption_info(dir); - if (err) - return ERR_PTR(err); - if (!fscrypt_has_encryption_key(dir)) - return ERR_PTR(-ENOKEY); - encrypt = 1; - } - - if (!handle && sbi->s_journal && !(i_flags & EXT4_EA_INODE_FL)) { - ret2 = ext4_xattr_credits_for_new_inode(dir, mode, encrypt); - if (ret2 < 0) - return ERR_PTR(ret2); - nblocks += ret2; - } - ngroups = ext4_get_groups_count(sb); trace_ext4_request_inode(dir, mode); inode = new_inode(sb); @@ -878,10 +860,25 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, else ei->i_projid = make_kprojid(&init_user_ns, EXT4_DEF_PROJID); + if (!(i_flags & EXT4_EA_INODE_FL)) { + err = fscrypt_prepare_new_inode(dir, inode, &encrypt); + if (err) + goto out; + } + err = dquot_initialize(inode); if (err) goto out; + if (!handle && sbi->s_journal && !(i_flags & EXT4_EA_INODE_FL)) { + ret2 = ext4_xattr_credits_for_new_inode(dir, mode, encrypt); + if (ret2 < 0) { + err = ret2; + goto out; + } + nblocks += ret2; + } + if (!goal) goal = sbi->s_inode_goal; @@ -1174,7 +1171,7 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, * prevent its deduplication. */ if (encrypt) { - err = fscrypt_inherit_context(dir, inode, handle, true); + err = fscrypt_set_context(inode, handle); if (err) goto fail_free_drop; }