3.2.102-rc1 review patch. If anyone has any objections, please let me know.
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From: "Darrick J. Wong" darrick.wong@oracle.com
commit e674e5cbd0942b42a12106ac0be8330f4301bef4 upstream.
On a bigalloc,^flex_bg filesystem, the ext4_valid_block_bitmap function fails to convert from blocks to clusters when spot-checking the validity of the bitmap block that we've just read from disk. This causes ext4 to think that the bitmap is garbage, which results in the block group being taken offline when it's not necessary. Add in the necessary EXT4_B2C() calls to perform the conversions.
Signed-off-by: Darrick J. Wong darrick.wong@oracle.com Signed-off-by: "Theodore Ts'o" tytso@mit.edu [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- fs/ext4/balloc.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
--- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -278,6 +278,7 @@ static int ext4_valid_block_bitmap(struc unsigned int block_group, struct buffer_head *bh) { + struct ext4_sb_info *sbi = EXT4_SB(sb); ext4_grpblk_t offset; ext4_grpblk_t next_zero_bit; ext4_fsblk_t bitmap_blk; @@ -297,14 +298,14 @@ static int ext4_valid_block_bitmap(struc /* check whether block bitmap block number is set */ bitmap_blk = ext4_block_bitmap(sb, desc); offset = bitmap_blk - group_first_block; - if (!ext4_test_bit(offset, bh->b_data)) + if (!ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data)) /* bad block bitmap */ goto err_out;
/* check whether the inode bitmap block number is set */ bitmap_blk = ext4_inode_bitmap(sb, desc); offset = bitmap_blk - group_first_block; - if (!ext4_test_bit(offset, bh->b_data)) + if (!ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data)) /* bad block bitmap */ goto err_out;
@@ -312,9 +313,10 @@ static int ext4_valid_block_bitmap(struc bitmap_blk = ext4_inode_table(sb, desc); offset = bitmap_blk - group_first_block; next_zero_bit = ext4_find_next_zero_bit(bh->b_data, - offset + EXT4_SB(sb)->s_itb_per_group, - offset); - if (next_zero_bit >= offset + EXT4_SB(sb)->s_itb_per_group) + EXT4_B2C(sbi, offset + EXT4_SB(sb)->s_itb_per_group), + EXT4_B2C(sbi, offset)); + if (next_zero_bit >= + EXT4_B2C(sbi, offset + EXT4_SB(sb)->s_itb_per_group)) /* good bitmap for inode tables */ return 1;