btrfs: Add a helper try_merge_free_space()

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When adding a new extent, we'll firstly see if we can merge
this extent to the left or/and right extent. Extract this as
a helper try_merge_free_space().

As a side effect, we fix a small bug that if the new extent
has non-bitmap left entry but is unmergeble, we'll directly
link the extent without trying to drop it into bitmap.

This also prepares for the next patch.

Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>

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Li Zefan 2010-11-09 14:56:50 +08:00

parent 5e71b5d5ec

commit 120d66eec0

1 changed files with 43 additions and 32 deletions

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75

fs/btrfs/free-space-cache.c

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