tree ead85388bdf5792288398011b47ad23b1215ab2c
parent 9a025a0860ccc0f02af153c966bc1f83e5d9fc62
author Wang Shilong <wangsl.fnst@cn.fujitsu.com> 1405568654 +0800
committer Chris Mason <clm@fb.com> 1408463533 -0700

Btrfs: fix wrong extent mapping for DirectIO

btrfs_next_leaf() will use current leaf's last key to search
and then return a bigger one. So it may still return a file extent
item that is smaller than expected value and we will
get an overflow here for @em->len.

This is easy to reproduce for Btrfs Direct writting, it did not
cause any problem, because writting will re-insert right mapping later.

However, by hacking code to make DIO support compression, wrong extent
mapping is kept and it encounter merging failure(EEXIST) quickly.

Fix this problem by looping to find next file extent item that is bigger
than @start or we could not find anything more.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>