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authorDave Chinner <dchinner@redhat.com>2011-07-08 14:14:44 +1000
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-20 20:47:41 -0400
commit0e1fdafd93980eac62e778798549ce0f6073905c (patch)
treea8b21525d195d436fa738e9a470e64eaa21e6736 /include
parent4f8c19fdf3f97402b68f058b1c72a6c7166c9e59 (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index d7f35e90b84..1393742bba9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1655,6 +1655,8 @@ struct super_operations {
ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
#endif
int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
+ int (*nr_cached_objects)(struct super_block *);
+ void (*free_cached_objects)(struct super_block *, int);
};
/*