From mboxrd@z Thu Jan 1 00:00:00 1970 From: Subject: patch ext4-fix-xattr-deadlock.patch added to 2.6.27-stable tree Date: Wed, 03 Dec 2008 10:55:58 -0800 Message-ID: <20081203185923.5150649048@coco.kroah.org> References: <1226851540-8032-12-git-send-email-tytso@mit.edu> Cc: , To: kalpak.shah@sun.com, gregkh@suse.de, linux-ext4@vger.kernel.org, tytso@mit.edu Return-path: Received: from kroah.org ([198.145.64.141]:60930 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751787AbYLCS7Y (ORCPT ); Wed, 3 Dec 2008 13:59:24 -0500 In-Reply-To: <1226851540-8032-12-git-send-email-tytso@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: This is a note to let you know that we have just queued up the patch titled Subject: ext4: fix xattr deadlock to the 2.6.27-stable tree. Its filename is ext4-fix-xattr-deadlock.patch A git repo of this tree can be found at http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary >>From tytso@mit.edu Wed Dec 3 10:42:04 2008 From: Kalpak Shah Date: Sun, 16 Nov 2008 11:05:31 -0500 Subject: ext4: fix xattr deadlock To: stable@kernel.org Cc: Kalpak Shah , Ext4 Developers List , "Theodore Ts'o" Message-ID: <1226851540-8032-12-git-send-email-tytso@mit.edu> From: Kalpak Shah (cherry picked from commit 4d20c685fa365766a8f13584b4c8178a15ab7103) ext4_xattr_set_handle() eventually ends up calling ext4_mark_inode_dirty() which tries to expand the inode by shifting the EAs. This leads to the xattr_sem being downed again and leading to a deadlock. This patch makes sure that if ext4_xattr_set_handle() is in the call-chain, ext4_mark_inode_dirty() will not expand the inode. Signed-off-by: Kalpak Shah Signed-off-by: "Theodore Ts'o" Signed-off-by: Greg Kroah-Hartman --- fs/ext4/xattr.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -959,6 +959,7 @@ ext4_xattr_set_handle(handle_t *handle, struct ext4_xattr_block_find bs = { .s = { .not_found = -ENODATA, }, }; + unsigned long no_expand; int error; if (!name) @@ -966,6 +967,9 @@ ext4_xattr_set_handle(handle_t *handle, if (strlen(name) > 255) return -ERANGE; down_write(&EXT4_I(inode)->xattr_sem); + no_expand = EXT4_I(inode)->i_state & EXT4_STATE_NO_EXPAND; + EXT4_I(inode)->i_state |= EXT4_STATE_NO_EXPAND; + error = ext4_get_inode_loc(inode, &is.iloc); if (error) goto cleanup; @@ -1042,6 +1046,8 @@ ext4_xattr_set_handle(handle_t *handle, cleanup: brelse(is.iloc.bh); brelse(bs.bh); + if (no_expand == 0) + EXT4_I(inode)->i_state &= ~EXT4_STATE_NO_EXPAND; up_write(&EXT4_I(inode)->xattr_sem); return error; } Patches currently in stable-queue which might be from kalpak.shah@sun.com are queue-2.6.27/ext4-fix-xattr-deadlock.patch