ext4: make ext4_ext_convert_to_initialized() return proper number of blocks
authorJan Kara <jack@suse.cz>
Thu, 30 Oct 2014 14:53:17 +0000 (10:53 -0400)
committerTheodore Ts'o <tytso@mit.edu>
Thu, 30 Oct 2014 14:53:17 +0000 (10:53 -0400)
commitae9e9c6aeea6f91ccb4fb369d7dd8f1a8b5f6a58
tree7eba907e57a324fb69f42336fc4083421a6761a9
parent4f879ca687a5f2473b952937ce92c795a39019b4
ext4: make ext4_ext_convert_to_initialized() return proper number of blocks

ext4_ext_convert_to_initialized() can return more blocks than are
actually allocated from map->m_lblk in case where initial part of the
on-disk extent is zeroed out. Luckily this doesn't have serious
consequences because the caller currently uses the return value
only to unmap metadata buffers. Anyway this is a data
corruption/exposure problem waiting to happen so fix it.

Coverity-id: 1226848
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
fs/ext4/extents.c