dcache: let the dentry count go down to zero without taking d_lock
We can be more aggressive about this, if we are clever and careful. This is subtle.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/lockref.h b/include/linux/lockref.h
index 4bfde0e..b10b122d 100644
--- a/include/linux/lockref.h
+++ b/include/linux/lockref.h
@@ -28,12 +28,13 @@
#endif
struct {
spinlock_t lock;
- unsigned int count;
+ int count;
};
};
};
extern void lockref_get(struct lockref *);
+extern int lockref_put_return(struct lockref *);
extern int lockref_get_not_zero(struct lockref *);
extern int lockref_get_or_lock(struct lockref *);
extern int lockref_put_or_lock(struct lockref *);