Commit a8ac900b authored by Gioh Kim's avatar Gioh Kim Committed by Theodore Ts'o
Browse files

ext4: use non-movable memory for the ext4 superblock 



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: default avatarGioh Kim <gioh.kim@lge.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
parent 3b5e6454

fs/ext4/super.c

+3 −3
Original line number Diff line number Diff line
@@ -3436,7 +3436,7 @@ 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_unmovable(sb, logical_sb_block))) {

		ext4_msg(sb, KERN_ERR, "unable to read superblock");

		goto out_fail;

	}
@@ -3646,7 +3646,7 @@ 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_unmovable(sb, logical_sb_block);

		if (!bh) {

			ext4_msg(sb, KERN_ERR,

			       "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++) {

		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]) {

			ext4_msg(sb, KERN_ERR,

			       "can't read group descriptor %d", i);