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ext4: use non-movable memory for the ext4 superblock

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Since the ext4 superblock is not released until the file system is
unmounted, allocate the buffer cache entry for the ext4 superblock out
of the non-moveable are to allow page migrations and thus CMA
allocations to more easily succeed if the CMA area is limited.

Signed-off-by: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Gioh Kim 2014-09-04 22:36:15 -04:00 committed by Theodore Ts'o
parent 3b5e6454aa
commit a8ac900b81
1 changed files with 3 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
fs/ext4/super.c
View file

@ -3436,7 +3436,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
logical_sb_block = sb_block; logical_sb_block = sb_block;
} }
if (!(bh = sb_bread(sb, logical_sb_block))) { if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
ext4_msg(sb, KERN_ERR, "unable to read superblock"); ext4_msg(sb, KERN_ERR, "unable to read superblock");
goto out_fail; goto out_fail;
} }
@ -3646,7 +3646,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
brelse(bh); brelse(bh);
logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
offset = do_div(logical_sb_block, blocksize); offset = do_div(logical_sb_block, blocksize);
bh = sb_bread(sb, logical_sb_block); bh = sb_bread_unmovable(sb, logical_sb_block);
if (!bh) { if (!bh) {
ext4_msg(sb, KERN_ERR, ext4_msg(sb, KERN_ERR,
"Can't read superblock on 2nd try"); "Can't read superblock on 2nd try");
@ -3868,7 +3868,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
for (i = 0; i < db_count; i++) { for (i = 0; i < db_count; i++) {
block = descriptor_loc(sb, logical_sb_block, 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_unmovable(sb, block);
if (!sbi->s_group_desc[i]) { if (!sbi->s_group_desc[i]) {
ext4_msg(sb, KERN_ERR, ext4_msg(sb, KERN_ERR,
"can't read group descriptor %d", i); "can't read group descriptor %d", i);