fs: dcache documentation cleanup

Remove redundant (and incorrect, since dcache RCU lookup) dentry locking
documentation and point to the canonical document.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 6a4aea3..fff9755 100644 (file)
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -141,22 +141,16 @@ struct dentry_operations {
        char *(*d_dname)(struct dentry *, char *, int);
 };
 
-/* the dentry parameter passed to d_hash and d_compare is the parent
+/*
+ * Locking rules for dentry_operations callbacks are to be found in
+ * Documentation/filesystems/Locking. Keep it updated!
+ *
+ * the dentry parameter passed to d_hash and d_compare is the parent
  * directory of the entries to be compared. It is used in case these
  * functions need any directory specific information for determining
  * equivalency classes.  Using the dentry itself might not work, as it
  * might be a negative dentry which has no information associated with
- * it */
-
-/*
-locking rules:
-               big lock        dcache_lock     d_lock   may block
-d_revalidate:  no              no              no       yes
-d_hash         no              no              no       yes
-d_compare:     no              yes             yes      no
-d_delete:      no              yes             no       no
-d_release:     no              no              no       yes
-d_iput:                no              no              no       yes
+ * it.
  */
 
 /* d_flags entries */