tree d0c9c7be653b3306f9cfb76ba9805f36c9295e37
parent ecb8bea87d05fd2d1fc0718e1e4bbf09c7c6045a
author Liu Bo <liubo2009@cn.fujitsu.com> 1333029464 -0400
committer Chris Mason <chris.mason@oracle.com> 1333029464 -0400

Btrfs: fix the mismatch of page->mapping

commit 600a45e1d5e376f679ff9ecc4ce9452710a6d27c
(Btrfs: fix deadlock on page lock when doing auto-defragment)
fixes the deadlock on page, but it also introduces another bug.

A page may have been truncated after unlock & lock.
So we need to find it again to get the right one.

And since we've held i_mutex lock, inode size remains unchanged and
we can drop isize overflow checks.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>