afs: Log more information for "kAFS: AFS vnode with undefined type\n"

Log more information when "kAFS: AFS vnode with undefined type\n" is
displayed due to a vnode record being retrieved from the server that
appears to have a duff file type (usually 0).  This prints more information
to try and help pin down the problem.
Signed-off-by: David Howells <dhowells@redhat.com>

fs/afs/dir.c

@@ -776,7 +776,7 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
 		ti = afs_iget(dir->i_sb, key, &cookie->fids[i],
 			      &cookie->statuses[i],
 			      &cookie->callbacks[i],
-			      cbi);
+			      cbi, dvnode);
 		if (i == 0) {
 			inode = ti;
 		} else {
@@ -1125,7 +1125,7 @@ static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
 		return;
 
 	inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
-			 newfid, newstatus, newcb, fc->cbi);
+			 newfid, newstatus, newcb, fc->cbi, fc->vnode);
 	if (IS_ERR(inode)) {
 		/* ENOMEM or EINTR at a really inconvenient time - just abandon
 		 * the new directory on the server.

fs/afs/inode.c

@@ -29,10 +29,36 @@ static const struct inode_operations afs_symlink_inode_operations = {
 	.listxattr	= afs_listxattr,
 };
 
+static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
+{
+	static unsigned long once_only;
+
+	pr_warn("kAFS: AFS vnode with undefined type %u\n",
+		vnode->status.type);
+	pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
+		vnode->status.abort_code,
+		vnode->status.mode,
+		vnode->status.size,
+		vnode->status.data_version);
+	pr_warn("kAFS: vnode %llx:%llx:%x\n",
+		vnode->fid.vid,
+		vnode->fid.vnode,
+		vnode->fid.unique);
+	if (parent_vnode)
+		pr_warn("kAFS: dir %llx:%llx:%x\n",
+			parent_vnode->fid.vid,
+			parent_vnode->fid.vnode,
+			parent_vnode->fid.unique);
+
+	if (!test_and_set_bit(0, &once_only))
+		dump_stack();
+}
+
 /*
  * Initialise an inode from the vnode status.
  */
-static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key)
+static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key,
+				      struct afs_vnode *parent_vnode)
 {
 	struct inode *inode = AFS_VNODE_TO_I(vnode);
 
@@ -80,7 +106,7 @@ static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key)
 		inode_nohighmem(inode);
 		break;
 	default:
-		printk("kAFS: AFS vnode with undefined type\n");
+		dump_vnode(vnode, parent_vnode);
 		read_sequnlock_excl(&vnode->cb_lock);
 		return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
 	}
@@ -270,7 +296,8 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
  */
 struct inode *afs_iget(struct super_block *sb, struct key *key,
 		       struct afs_fid *fid, struct afs_file_status *status,
-		       struct afs_callback *cb, struct afs_cb_interest *cbi)
+		       struct afs_callback *cb, struct afs_cb_interest *cbi,
+		       struct afs_vnode *parent_vnode)
 {
 	struct afs_iget_data data = { .fid = *fid };
 	struct afs_super_info *as;
@@ -327,7 +354,7 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
 		vnode->cb_expires_at += ktime_get_real_seconds();
 	}
 
-	ret = afs_inode_init_from_status(vnode, key);
+	ret = afs_inode_init_from_status(vnode, key, parent_vnode);
 	if (ret < 0)
 		goto bad_inode;
 

fs/afs/internal.h

@@ -993,7 +993,8 @@ extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
 extern struct inode *afs_iget(struct super_block *, struct key *,
 			      struct afs_fid *, struct afs_file_status *,
 			      struct afs_callback *,
-			      struct afs_cb_interest *);
+			      struct afs_cb_interest *,
+			      struct afs_vnode *);
 extern void afs_zap_data(struct afs_vnode *);
 extern int afs_validate(struct afs_vnode *, struct key *);
 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);

fs/afs/super.c

@@ -453,7 +453,7 @@ static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
 		fid.vnode	= 1;
 		fid.vnode_hi	= 0;
 		fid.unique	= 1;
-		inode = afs_iget(sb, ctx->key, &fid, NULL, NULL, NULL);
+		inode = afs_iget(sb, ctx->key, &fid, NULL, NULL, NULL, NULL);
 	}
 
 	if (IS_ERR(inode))