ceph: keep reference to parent inode on ceph_dentry

[pandora-kernel.git] / fs / ceph / dir.c

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index d902948..6bfaa6a 100644 (file)
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -60,6 +60,7 @@ int ceph_init_dentry(struct dentry *dentry)
        }
        di->dentry = dentry;
        di->lease_session = NULL;
+       di->parent_inode = igrab(dentry->d_parent->d_inode);
        dentry->d_fsdata = di;
        dentry->d_time = jiffies;
        ceph_dentry_lru_add(dentry);
@@ -1025,7 +1026,7 @@ static void ceph_dentry_release(struct dentry *dentry)
        u64 snapid = CEPH_NOSNAP;
 
        if (!IS_ROOT(dentry)) {
-               parent_inode = dentry->d_parent->d_inode;
+               parent_inode = di->parent_inode;
                if (parent_inode)
                        snapid = ceph_snap(parent_inode);
        }
@@ -1050,6 +1051,8 @@ static void ceph_dentry_release(struct dentry *dentry)
                kmem_cache_free(ceph_dentry_cachep, di);
                dentry->d_fsdata = NULL;
        }
+       if (parent_inode)
+               iput(parent_inode);
 }
 
 static int ceph_snapdir_d_revalidate(struct dentry *dentry,
@@ -1216,6 +1219,26 @@ void ceph_dentry_lru_del(struct dentry *dn)
        }
 }
 
+/*
+ * Return name hash for a given dentry.  This is dependent on
+ * the parent directory's hash function.
+ */
+unsigned ceph_dentry_hash(struct dentry *dn)
+{
+       struct inode *dir = dn->d_parent->d_inode;
+       struct ceph_inode_info *dci = ceph_inode(dir);
+
+       switch (dci->i_dir_layout.dl_dir_hash) {
+       case 0: /* for backward compat */
+       case CEPH_STR_HASH_LINUX:
+               return dn->d_name.hash;
+
+       default:
+               return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
+                                    dn->d_name.name, dn->d_name.len);
+       }
+}
+
 const struct file_operations ceph_dir_fops = {
        .read = ceph_read_dir,
        .readdir = ceph_readdir,