vfs: remove DCACHE_NEED_LOOKUP

The code that relied on that flag was ripped out of btrfs quite some
time ago, and never added back. Josef indicated that he was going to
take a different approach to the problem in btrfs, and that we
could just eliminate this flag.

Cc: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 32 deletions

diff --git a/fs/dcache.c b/fs/dcache.c
index 3a463d0c4fe8..1782be3fc3ef 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -455,24 +455,6 @@ void d_drop(struct dentry *dentry)
 EXPORT_SYMBOL(d_drop);
 
 /*
- * d_clear_need_lookup - drop a dentry from cache and clear the need lookup flag
- * @dentry: dentry to drop
- *
- * This is called when we do a lookup on a placeholder dentry that needed to be
- * looked up.  The dentry should have been hashed in order for it to be found by
- * the lookup code, but now needs to be unhashed while we do the actual lookup
- * and clear the DCACHE_NEED_LOOKUP flag.
- */
-void d_clear_need_lookup(struct dentry *dentry)
-{
-        spin_lock(&dentry->d_lock);
-        __d_drop(dentry);
-        dentry->d_flags &= ~DCACHE_NEED_LOOKUP;
-        spin_unlock(&dentry->d_lock);
-}
-EXPORT_SYMBOL(d_clear_need_lookup);
-
-/*
  * Finish off a dentry we've decided to kill.
  * dentry->d_lock must be held, returns with it unlocked.
  * If ref is non-zero, then decrement the refcount too.
@@ -565,13 +547,7 @@ repeat:
         if (d_unhashed(dentry))
                 goto kill_it;
 
-        /*
-         * If this dentry needs lookup, don't set the referenced flag so that it
-         * is more likely to be cleaned up by the dcache shrinker in case of
-         * memory pressure.
-         */
-        if (!d_need_lookup(dentry))
-                dentry->d_flags |= DCACHE_REFERENCED;
+        dentry->d_flags |= DCACHE_REFERENCED;
         dentry_lru_add(dentry);
 
         dentry->d_count--;
@@ -1737,13 +1713,6 @@ struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode,
         }
 
         /*
-         * We are going to instantiate this dentry, unhash it and clear the
-         * lookup flag so we can do that.
-         */
-        if (unlikely(d_need_lookup(found)))
-                d_clear_need_lookup(found);
-
-        /*
          * Negative dentry: instantiate it unless the inode is a directory and
          * already has a dentry.
          */