[PATCH 2/5] staging: lustre: llite: use d_splice_alias for directories.

[NeilBrown]

In the Linux dcache a directory only ever has one dentry,
so d_splice_alias() can be used by ll_splice_alias() for directories.
It will find the one dentry whether it is DCACHE_DISCONNECTED or
IS_ROOT() or d_lustre_invalid().
Separating out the directories from non-directories will allow us
to simplify the non-directory code.

Signed-off-by: NeilBrown <ne...@suse.com>
---
 drivers/staging/lustre/lustre/llite/namei.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/namei.c 
b/drivers/staging/lustre/lustre/llite/namei.c
index a2687f46a16d..60fb18f83bf8 100644
--- a/drivers/staging/lustre/lustre/llite/namei.c
+++ b/drivers/staging/lustre/lustre/llite/namei.c
@@ -434,7 +434,7 @@ static struct dentry *ll_find_alias(struct inode *inode, 
struct dentry *dentry)
  */
 struct dentry *ll_splice_alias(struct inode *inode, struct dentry *de)
 {
-       if (inode) {
+       if (inode && !S_ISDIR(inode->i_mode)) {
                struct dentry *new = ll_find_alias(inode, de);
 
                if (new) {
@@ -445,8 +445,13 @@ struct dentry *ll_splice_alias(struct inode *inode, struct 
dentry *de)
                              new, d_inode(new), d_count(new), new->d_flags);
                        return new;
                }
+               d_add(de, inode);
+       } else {
+               struct dentry *new = d_splice_alias(inode, de);
+
+               if (new)
+                       de = new;
        }
-       d_add(de, inode);
        CDEBUG(D_DENTRY, "Add dentry %p inode %p refc %d flags %#x\n",
               de, d_inode(de), d_count(de), de->d_flags);
        return de;