tree 00190de63e0573193302449e3df0d13cc467ac41
parent 0040e606e35a0db80fc3fac04ccc7c7176a8e2b1
author Qu Wenruo <quwenruo@cn.fujitsu.com> 1397529660 +0800
committer Chris Mason <clm@fb.com> 1398383012 -0700

btrfs: Change the hole range to a more accurate value.

Commit 3ac0d7b96a268a98bd474cab8bce3a9f125aaccf fixed the btrfs expanding
write problem but the hole punched is sometimes too large for some
iovec, which has unmapped data ranges.
This patch will change to hole range to a more accurate value using the
counts checked by the write check routines.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>