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ext4: Fix block zeroing when punching holes in indirect block files 

free_holes_block() passed local variable as a block pointer
to ext4_clear_blocks(). Thus ext4_clear_blocks() zeroed out this local
variable instead of proper place in inode / indirect block. We later
zero out proper place in inode / indirect block but don't dirty the
inode / buffer again which can lead to subtle issues (some changes e.g.
to inode can be lost).

Change-Id: I0e5aed175d60feecba2b37f73986988412282958
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2014-06-26 12:28:57 -04:00 committed by syphyr
parent 6c99318533
commit 4bf9fddb6f
1 changed files with 2 additions and 2 deletions
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4
fs/ext4/indirect.c
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@ -1348,8 +1348,8 @@ static int free_hole_blocks(handle_t *handle, struct inode *inode,
if (level == 0 ||
(bh && all_zeroes((__le32 *)bh->b_data,
(__le32 *)bh->b_data + addr_per_block))) {
ext4_free_data(handle, inode, parent_bh, &blk, &blk+1);
*i_data = 0;
ext4_free_data(handle, inode, parent_bh,
i_data, i_data + 1);
}
brelse(bh);
bh = NULL;