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ext2_quota_write() doesn't properly setup bh it passes to ext2_get_block() and thus we hit assertion BUG_ON(maxblocks == 0) in ext2_get_blocks() (or we could actually ask for mapping arbitrary number of blocks depending on whatever value was on stack). Fix ext2_quota_write() to properly fill in number of blocks to map. CC: [email protected] # >= 2.6.12 Reviewed-by: "Theodore Ts'o" <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Reported-by: Christoph Hellwig <[email protected]> Signed-off-by: Jan Kara <[email protected]>