Btrfs: adjust len of writes if following a preallocated extent
authorLiu Bo <bo.li.liu@oracle.com>
Fri, 4 Nov 2016 19:20:54 +0000 (12:20 -0700)
committerDavid Sterba <dsterba@suse.com>
Wed, 30 Nov 2016 12:45:18 +0000 (13:45 +0100)
commita23eaa875f0f1d89eb866b8c9860e78273ff5daf
treeb054482b1706390b6e5eefb435ba71393d505902
parent7b9ea6279b337455268fa41c1ddec22f1cb44e8f
Btrfs: adjust len of writes if following a preallocated extent

If we have

|0--hole--4095||4096--preallocate--12287|

instead of using preallocated space, a 8K direct write will just
create a new 8K extent and it'll end up with

|0--new extent--8191||8192--preallocate--12287|

It's because we find a hole em and then go to create a new 8K
extent directly without adjusting @len.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Chris Mason <clm@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
fs/btrfs/inode.c