tree faf541835e82e9d56c7474c04b2d785821fe61d3
parent 0d399205edf3a4c290e76ebb36e541593af4a1b4
author Josef Bacik <josef@redhat.com> 1302567611 -0400
committer Chris Mason <chris.mason@oracle.com> 1302952256 -0400

Btrfs: avoid taking the chunk_mutex in do_chunk_alloc

Everytime we try to allocate disk space we try and see if we can pre-emptively
allocate a chunk, but in the common case we don't allocate anything, so there is
no sense in taking the chunk_mutex at all.  So instead if we are allocating a
chunk, mark it in the space_info so we don't get two people trying to allocate
at the same time.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Reviewed-by: Liu Bo <liubo2009@cn.fujitsu.com>