tree 8a07ab45a145ac723bdfe011a187d09eb0cc2803
parent 0afbaf8c8216a0de64b55c2d455de2b6c9dde5eb
author Chris Mason <chris.mason@oracle.com> 1208549490 -0400
committer Chris Mason <chris.mason@oracle.com> 1222355042 -0400

Force page->private removal in btrfs_invalidatepage

btrfs_invalidatepage is not allowed to leave pages around on the lru.
Any such pages will trigger an oops later on because the VM will see
page->private and assume it is a buffer head.

This also forces extra flushes of the async work queues before
dropping all the pages on the btree inode during unmount.  Left over
items on the work queues are one possible cause of busy state ranges
during truncate_inode_pages.

Signed-off-by: Chris Mason <chris.mason@oracle.com>