From a2dc52b5d1d8cc280b3e795abf1c80ac8c49f30c Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Tue, 12 May 2009 13:51:29 -0400 Subject: ext4: Add BUG_ON debugging checks to noalloc_get_block_write() Enforce that noalloc_get_block_write() is only called to map one block at a time, and that it always is successful in finding a mapping for given an inode's logical block block number if it is called with create == 1. Signed-off-by: "Theodore Ts'o" --- fs/ext4/inode.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/ext4') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index fd5f27a9b81..e6113c3a126 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2433,11 +2433,14 @@ static int noalloc_get_block_write(struct inode *inode, sector_t iblock, int ret = 0; unsigned max_blocks = bh_result->b_size >> inode->i_blkbits; + BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); + /* * we don't want to do block allocation in writepage * so call get_block_wrap with create = 0 */ ret = ext4_get_blocks(NULL, inode, iblock, max_blocks, bh_result, 0); + BUG_ON(create && ret == 0); if (ret > 0) { bh_result->b_size = (ret << inode->i_blkbits); ret = 0; -- cgit v1.2.3