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ext4: fix online resize with a non-standard blocks per group setting
commit 3d2660d0c9c2f296837078c189b68a47f6b2e3b5 upstream. The set_flexbg_block_bitmap() function assumed that the number of blocks in a blockgroup was sb->blocksize * 8, which is normally true, but not always! Use EXT4_BLOCKS_PER_GROUP(sb) instead, to fix block bitmap corruption after: mke2fs -t ext4 -g 3072 -i 4096 /dev/vdd 1G mount -t ext4 /dev/vdd /vdd resize2fs /dev/vdd 8G Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reported-by: Jon Bernard <jbernard@tuxion.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -404,7 +404,7 @@ static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
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start = ext4_group_first_block_no(sb, group);
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group -= flex_gd->groups[0].group;
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count2 = sb->s_blocksize * 8 - (block - start);
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count2 = EXT4_BLOCKS_PER_GROUP(sb) - (block - start);
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if (count2 > count)
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count2 = count;
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