From: Subject: patch ext4-add-fallback-for-find_group_flex.patch added to 2.6.27-stable tree Date: Thu, 12 Mar 2009 23:33:44 -0700 Message-ID: <20090313063751.6D4494903F@coco.kroah.org> References: <1236238447-8341-1-git-send-email-tytso@mit.edu> Cc: , To: tytso@mit.edu, gregkh@suse.de, linux-ext4@vger.kernel.org Return-path: Received: from kroah.org ([198.145.64.141]:42309 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752784AbZCMGhx (ORCPT ); Fri, 13 Mar 2009 02:37:53 -0400 In-Reply-To: <1236238447-8341-1-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: Add fallback for find_group_flex to the 2.6.27-stable tree. Its filename is ext4-add-fallback-for-find_group_flex.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 Thu Mar 12 23:32:27 2009 From: "Theodore Ts'o" Date: Thu, 5 Mar 2009 02:34:06 -0500 Subject: ext4: Add fallback for find_group_flex To: stable@kernel.org Cc: Ext4 Developers List , "Theodore Ts'o" Message-ID: <1236238447-8341-1-git-send-email-tytso@mit.edu> From: "Theodore Ts'o" (cherry picked from commit 05bf9e839d9de4e8a094274a0a2fd07beb47eaf1) This is a workaround for find_group_flex() which badly needs to be replaced. One of its problems (besides ignoring the Orlov algorithm) is that it is a bit hyperactive about returning failure under suspicious circumstances. This can lead to spurious ENOSPC failures even when there are inodes still available. Work around this for now by retrying the search using find_group_other() if find_group_flex() returns -1. If find_group_other() succeeds when find_group_flex() has failed, log a warning message. A better block/inode allocator that will fix this problem for real has been queued up for the next merge window. Signed-off-by: "Theodore Ts'o" Signed-off-by: Greg Kroah-Hartman --- fs/ext4/ialloc.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -702,6 +702,13 @@ struct inode *ext4_new_inode(handle_t *h if (sbi->s_log_groups_per_flex) { ret2 = find_group_flex(sb, dir, &group); + if (ret2 == -1) { + ret2 = find_group_other(sb, dir, &group); + if (ret2 == 0 && printk_ratelimit()) + printk(KERN_NOTICE "ext4: find_group_flex " + "failed, fallback succeeded dir %lu\n", + dir->i_ino); + } goto got_group; } Patches currently in stable-queue which might be from tytso@mit.edu are queue-2.6.27/jbd2-fix-return-value-of-jbd2_journal_start_commit.patch queue-2.6.27/revert-ext4-wait-on-all-pending-commits-in-ext4_sync_fs.patch queue-2.6.27/jbd2-avoid-possible-null-dereference-in-jbd2_journal_begin_ordered_truncate.patch queue-2.6.27/ext4-fix-to-read-empty-directory-blocks-correctly-in-64k.patch queue-2.6.27/ext4-fix-lockdep-warning.patch queue-2.6.27/ext4-initialize-preallocation-list_head-s-properly.patch queue-2.6.27/ext4-fix-null-dereference-in-ext4_ext_migrate-s-error-handling.patch queue-2.6.27/ext4-add-fallback-for-find_group_flex.patch queue-2.6.27/ext4-fix-deadlock-in-ext4_write_begin-and-ext4_da_write_begin.patch