AFS: fix a couple of problems with unlinking AFS files

Fix a couple of problems with unlinking AFS files.

 (1) The parent directory wasn't being updated properly between unlink() and
     the following lookup().

     It seems that, for some reason, invalidate_remote_inode() wasn't
     discarding the directory contents correctly, so this patch calls
     invalidate_inode_pages2() instead on non-regular files.

 (2) afs_vnode_deleted_remotely() should handle vnodes that don't have a
     source server recorded without oopsing.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 21 insertions, 12 deletions

diff --git a/fs/afs/vnode.c b/fs/afs/vnode.c
index ec814660209f..bea8bd9e7b2a 100644
--- a/fs/afs/vnode.c
+++ b/fs/afs/vnode.c
@@ -175,24 +175,33 @@ static void afs_vnode_deleted_remotely(struct afs_vnode *vnode)
 {
         struct afs_server *server;
 
+        _enter("{%p}", vnode->server);
+
         set_bit(AFS_VNODE_DELETED, &vnode->flags);
 
         server = vnode->server;
-        if (vnode->cb_promised) {
-                spin_lock(&server->cb_lock);
+        if (server) {
                 if (vnode->cb_promised) {
-                        rb_erase(&vnode->cb_promise, &server->cb_promises);
-                        vnode->cb_promised = false;
+                        spin_lock(&server->cb_lock);
+                        if (vnode->cb_promised) {
+                                rb_erase(&vnode->cb_promise,
+                                         &server->cb_promises);
+                                vnode->cb_promised = false;
+                        }
+                        spin_unlock(&server->cb_lock);
                 }
-                spin_unlock(&server->cb_lock);
-        }
 
-        spin_lock(&vnode->server->fs_lock);
-        rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
-        spin_unlock(&vnode->server->fs_lock);
+                spin_lock(&server->fs_lock);
+                rb_erase(&vnode->server_rb, &server->fs_vnodes);
+                spin_unlock(&server->fs_lock);
 
-        vnode->server = NULL;
-        afs_put_server(server);
+                vnode->server = NULL;
+                afs_put_server(server);
+        } else {
+                ASSERT(!vnode->cb_promised);
+        }
+
+        _leave("");
 }
 
 /*
@@ -225,7 +234,7 @@ void afs_vnode_finalise_status_update(struct afs_vnode *vnode,
  */
 static void afs_vnode_status_update_failed(struct afs_vnode *vnode, int ret)
 {
-        _enter("%p,%d", vnode, ret);
+        _enter("{%x:%u},%d", vnode->fid.vid, vnode->fid.vnode, ret);
 
         spin_lock(&vnode->lock);