tree e911bc79c795fceb3e9a618d8f18571c2a776307
parent 5378e60734f5b7bfe1b43dc191aaf6131c1befe7
author Li Dongyang <lidongyang@novell.com> 1300962268 +0000
committer root <Chris Mason chris.mason@oracle.com> 1301305067 -0400

Btrfs: add btrfs_trim_fs() to handle FITRIM

We take an free extent out from allocator, trim it, then put it back,
but before we trim the block group, we should make sure the block group is
cached, so plus a little change to make cache_block_group() run without a
transaction.

Signed-off-by: Li Dongyang <lidongyang@novell.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>