[PATCHv2 2/3] ext4: allocate buffer-cache for superblock in non-movable area

Gioh Kim
2014-08-19T06:53:26Z

A buffer-cache for superblock is disturbing page migration,
because the buffer-cache is not released until unmount.
The buffer-cache must be allocated from non-movable area.

Signed-off-by: Gioh Kim <gioh.kim@lge.com>
---
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 32b43ad..13d7770 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3435,7 +3435,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
logical_sb_block = sb_block;
}

- if (!(bh = sb_bread(sb, logical_sb_block))) {
+ if (!(bh = sb_bread_gfp(sb, logical_sb_block, 0))) {
ext4_msg(sb, KERN_ERR, "unable to read superblock");
goto out_fail;
}
@@ -3645,7 +3645,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
brelse(bh);
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
offset = do_div(logical_sb_block, blocksize);
- bh = sb_bread(sb, logical_sb_block);
+ bh = sb_bread_gfp(sb, logical_sb_block, 0);
if (!bh) {
ext4_msg(sb, KERN_ERR,
"Can't read superblock on 2nd try");
@@ -3867,7 +3867,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)

for (i = 0; i < db_count; i++) {
block = descriptor_loc(sb, logical_sb_block, i);
- sbi->s_group_desc[i] = sb_bread(sb, block);
+ sbi->s_group_desc[i] = sb_bread_gfp(sb, block, 0);
if (!sbi->s_group_desc[i]) {
ext4_msg(sb, KERN_ERR,
"can't read group descriptor %d", i);
--
1.7.9.5