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Chris Mason 6dddcbeb28 Btrfs: Use mutex_lock_nested for tree locking Lockdep has the notion of locking subclasses so that you can identify locks you expect to be taken after other locks of the same class. This changes the per-extent buffer btree locking routines to use a subclass based on the level in the tree. Unfortunately, lockdep can only handle 8 total subclasses, and the btrfs max level is also 8. So when lockdep is on, use a lower max level. Signed-off-by: Chris Mason <chris.mason@oracle.com>	History 2008-09-25 11:04:05 -04:00
fs/btrfs	Btrfs: Use mutex_lock_nested for tree locking	2008-09-25 11:04:05 -04:00

Chris Mason 6dddcbeb28 Btrfs: Use mutex_lock_nested for tree locking

Lockdep has the notion of locking subclasses so that you can identify
locks you expect to be taken after other locks of the same class.  This
changes the per-extent buffer btree locking routines to use a subclass based
on the level in the tree.

Unfortunately, lockdep can only handle 8 total subclasses, and the btrfs
max level is also 8.  So when lockdep is on, use a lower max level.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

History

2008-09-25 11:04:05 -04:00

fs/btrfs

Btrfs: Use mutex_lock_nested for tree locking

2008-09-25 11:04:05 -04:00