fs: change d_hash for rcu-walk

Change d_hash so it may be called from lock-free RCU lookups. See similar
patch for d_compare for details.

For in-tree filesystems, this is just a mechanical change.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 9a76f8d8bf95..a15ee207b449 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -10,7 +10,8 @@ be able to use diff(1).
 --------------------------- dentry_operations --------------------------
 prototypes:
         int (*d_revalidate)(struct dentry *, int);
-        int (*d_hash) (struct dentry *, struct qstr *);
+        int (*d_hash)(const struct dentry *, const struct inode *,
+                        struct qstr *);
         int (*d_compare)(const struct dentry *, const struct inode *,
                         const struct dentry *, const struct inode *,
                         unsigned int, const char *, const struct qstr *);
@@ -22,7 +23,7 @@ prototypes:
 locking rules:
                 dcache_lock     rename_lock     ->d_lock        may block
 d_revalidate:   no              no              no              yes
-d_hash          no              no              no              yes
+d_hash          no              no              no              no
 d_compare:      no              yes             no              no 
 d_delete:       yes             no              yes             no
 d_release:      no              no              no              yes