tree a8b21525d195d436fa738e9a470e64eaa21e6736
parent 4f8c19fdf3f97402b68f058b1c72a6c7166c9e59
author Dave Chinner <dchinner@redhat.com> 1310098484 +1000
committer Al Viro <viro@zeniv.linux.org.uk> 1311209261 -0400

superblock: add filesystem shrinker operations

Now we have a per-superblock shrinker implementation, we can add a
filesystem specific callout to it to allow filesystem internal
caches to be shrunk by the superblock shrinker.

Rather than perpetuate the multipurpose shrinker callback API (i.e.
nr_to_scan == 0 meaning "tell me how many objects freeable in the
cache), two operations will be added. The first will return the
number of objects that are freeable, the second is the actual
shrinker call.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>