This is a note to let you know that I've just added the patch titled
ext4: fix long mount times on very big file systems
to the 3.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-fix-long-mount-times-on-very-big-file-systems.patch
and it can be found in the queue-3.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 0548bbb85337e532ca2ed697c3e9b227ff2ed4b4 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <[email protected]>
Date: Thu, 16 Aug 2012 11:59:04 -0400
Subject: ext4: fix long mount times on very big file systems
From: Theodore Ts'o <[email protected]>
commit 0548bbb85337e532ca2ed697c3e9b227ff2ed4b4 upstream.
Commit 8aeb00ff85a: "ext4: fix overhead calculation used by
ext4_statfs()" introduced a O(n**2) calculation which makes very large
file systems take forever to mount. Fix this with an optimization for
non-bigalloc file systems. (For bigalloc file systems the overhead
needs to be set in the the superblock.)
Signed-off-by: "Theodore Ts'o" <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/ext4/super.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3110,6 +3110,10 @@ static int count_overhead(struct super_b
ext4_group_t i, ngroups = ext4_get_groups_count(sb);
int s, j, count = 0;
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
+ return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
+ sbi->s_itb_per_group + 2);
+
first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
(grp * EXT4_BLOCKS_PER_GROUP(sb));
last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
Patches currently in stable-queue which might be from [email protected] are
queue-3.5/ext4-avoid-kmemcheck-complaint-from-reading-uninitialized-memory.patch
queue-3.5/ext4-make-sure-the-journal-sb-is-written-in-ext4_clear_journal_err.patch
queue-3.5/ext4-fix-long-mount-times-on-very-big-file-systems.patch
queue-3.5/ext4-fix-kernel-bug-on-large-scale-rm-rf-commands.patch
queue-3.5/ext4-don-t-call-ext4_error-while-block-group-is-locked.patch
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