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authorChris Mason <chris.mason@oracle.com>2009-02-04 09:24:25 -0500
committerChris Mason <chris.mason@oracle.com>2009-02-04 09:24:25 -0500
commitc487685d7c18a8481900755aa5c56a7a74193101 (patch)
treef2ff6c059e24d7fdf2e1fff498bbef0bb90bfbfc /block
parent3935127c50c84106d654ef14962cff28c660bc62 (diff)
Btrfs: hash_lock is no longer needed
Before metadata is written to disk, it is updated to reflect that writeout has begun. Once this update is done, the block must be cow'd before it can be modified again. This update was originally synchronized by using a per-fs spinlock. Today the buffers for the metadata blocks are locked before writeout begins, and everyone that tests the flag has the buffer locked as well. So, the per-fs spinlock (called hash_lock for no good reason) is no longer required. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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