tree 0c0f4f7a0011749cda998431828cb9161747b51a
parent 9036c10208e1fc496cef7692ba66a78699b360dc
author Yan Zheng <zheng.yan@oracle.com> 1225390790 -0400
committer Chris Mason <chris.mason@oracle.com> 1225390790 -0400

Btrfs: Fix bookend extent race v2

When dropping middle part of an extent, btrfs_drop_extents truncates
the extent at first, then inserts a bookend extent.

Since truncation and insertion can't be done atomically, there is a small
period that the bookend extent isn't in the tree. This causes problem for
functions that search the tree for file extent item. The way to fix this is
lock the range of the bookend extent before truncation.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>