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ext4: Fix hole punching for files with indirect blocks

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Hole punching code for files with indirect blocks wrongly computed
number of blocks which need to be cleared when traversing the indirect
block tree. That could result in punching more blocks than actually
requested and thus effectively cause a data loss. For example:

fallocate -n -p 10240000 4096

will punch the range 10240000 - 12632064 instead of the range 1024000 -
10244096. Fix the calculation.

CC: stable@vger.kernel.org
Fixes: 8bad6fc813
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 12:30:54 -04:00 committed by Theodore Ts'o
parent 77ea2a4ba6
commit a93cd4cf86
1 changed files with 10 additions and 2 deletions
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12
fs/ext4/indirect.c
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@ -1316,16 +1316,24 @@ static int free_hole_blocks(handle_t *handle, struct inode *inode,
blk = *i_data;
if (level > 0) {
ext4_lblk_t first2;
ext4_lblk_t count2;
bh = sb_bread(inode->i_sb, le32_to_cpu(blk));
if (!bh) {
EXT4_ERROR_INODE_BLOCK(inode, le32_to_cpu(blk),
"Read failure");
return -EIO;
}
first2 = (first > offset) ? first - offset : 0;
if (first > offset) {
first2 = first - offset;
count2 = count;
} else {
first2 = 0;
count2 = count - (offset - first);
}
ret = free_hole_blocks(handle, inode, bh,
(__le32 *)bh->b_data, level - 1,
first2, count - offset,
first2, count2,
inode->i_sb->s_blocksize >> 2);
if (ret) {
brelse(bh);