Btrfs: avoid taking the chunk_mutex in do_chunk_alloc

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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>

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Josef Bacik 2011-04-11 20:20:11 -04:00 • committed by Chris Mason

parent 0d399205ed

commit 6d74119f1a

2 changed files with 28 additions and 6 deletions

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4

fs/btrfs/ctree.h

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30

fs/btrfs/extent-tree.c

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