afs: Get the target vnode in afs_rmdir() and get a callback on it

Get the target vnode in afs_rmdir() and validate it before we attempt the
deletion, The vnode pointer will be passed through to the delivery function
in a later patch so that the delivery function can mark it deleted.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 8936731c59ff..f2dd48d4363f 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -1174,7 +1174,7 @@ static void afs_dir_remove_subdir(struct dentry *dentry)
 static int afs_rmdir(struct inode *dir, struct dentry *dentry)
 {
         struct afs_fs_cursor fc;
-        struct afs_vnode *dvnode = AFS_FS_I(dir);
+        struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
         struct key *key;
         u64 data_version = dvnode->status.data_version;
         int ret;
@@ -1188,6 +1188,14 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
                 goto error;
         }
 
+        /* Try to make sure we have a callback promise on the victim. */
+        if (d_really_is_positive(dentry)) {
+                vnode = AFS_FS_I(d_inode(dentry));
+                ret = afs_validate(vnode, key);
+                if (ret < 0)
+                        goto error_key;
+        }
+
         ret = -ERESTARTSYS;
         if (afs_begin_vnode_operation(&fc, dvnode, key)) {
                 while (afs_select_fileserver(&fc)) {
@@ -1206,6 +1214,7 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
                 }
         }
 
+error_key:
         key_put(key);
 error:
         return ret;