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Commit b73fce69 authored by Valerie Clement's avatar Valerie Clement Committed by Theodore Ts'o
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ext4: Fix kernel BUG at fs/ext4/mballoc.c:910! 



With the flex_bg feature enabled, a large file creation oopses the
kernel.   The BUG_ON is:
	BUG_ON(len >= EXT4_BLOCKS_PER_GROUP(sb));

As the allocation of the bitmaps and the inode table can be done
outside the block group with flex_bg, this allows to allocate up to
EXT4_BLOCKS_PER_GROUP blocks in a group.

This patch fixes the oops.

Signed-off-by: default avatarValerie Clement <valerie.clement@bull.net>
Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 55bd725a

fs/ext4/mballoc.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -906,7 +906,7 @@ static void ext4_mb_mark_free_simple(struct super_block *sb, 
	unsigned short chunk;

	unsigned short chunk;

	unsigned short border;

	unsigned short border;





	BUG_ON(len >= EXT4_BLOCKS_PER_GROUP(sb));

	BUG_ON(len > EXT4_BLOCKS_PER_GROUP(sb));





	border = 2 << sb->s_blocksize_bits;

	border = 2 << sb->s_blocksize_bits;