linux-ext4 - [PATCH] ext4: register extent status shrinker before init percpu counter

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Message-Id: <1364479439-20277-1-git-send-email-wenqing.lz@taobao.com>
Date:	Thu, 28 Mar 2013 22:03:59 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	Zheng Liu <wenqing.lz@...bao.com>
Subject: [PATCH] ext4: register extent status shrinker before init percpu counter

From: Zheng Liu <wenqing.lz@...bao.com>

After applied this commit (621bcca5), when we get an error we will
unregsiter extent status shrinker.  We might run out of memory when we
initialize percpu counters.  If so, we will go to 'failed_mount3', and
unregister extent status shinker.  At that time extent status shrinker
has not yet been registered.

Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
Hi Ted,

Please fold this patch into the commit (621bcca5).

Thanks,
						- Zheng

 fs/ext4/super.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e3e6a06..febbe0e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3701,6 +3701,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_err_report.function = print_daily_error_info;
 	sbi->s_err_report.data = (unsigned long) sb;
 
+	/* Register extent status tree shrinker */
+	ext4_es_register_shrinker(sb);
+
 	err = percpu_counter_init(&sbi->s_freeclusters_counter,
 			ext4_count_free_clusters(sb));
 	if (!err) {
@@ -3726,9 +3729,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_max_writeback_mb_bump = 128;
 	sbi->s_extent_max_zeroout_kb = 32;
 
-	/* Register extent status tree shrinker */
-	ext4_es_register_shrinker(sb);
-
 	/*
 	 * set up enough so that it can read an inode
 	 */
-- 
1.7.12.rc2.18.g61b472e

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