[PATCH] ext4: Make ext4_ext_convert_to_initialized() return proper number of blocks

[Jan Kara]

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 <***@suse.cz>
---
fs/ext4/extents.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 37043d0b2be8..0b16fb4c06d3 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3603,11 +3603,10 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
}
}

- allocated = ext4_split_extent(handle, inode, ppath,
- &split_map, split_flag, flags);
- if (allocated < 0)
- err = allocated;