linux-kernel - [PATCH 03/18] autofs: Test autofs versions first on sb initialization

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Date:	Fri, 12 Aug 2016 10:47:44 +0800
From:	Ian Kent <raven@...maw.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Tomohiro Kusumi <kusumi.tomohiro@...il.com>,
	autofs mailing list <autofs@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 03/18] autofs: Test autofs versions first on sb
 initialization

From: Tomohiro Kusumi <kusumi.tomohiro@...il.com>

This patch does what the below comment says.
It could be and it's considered better to do this first
before various functions get called during initialization.

/* Couldn't this be tested earlier? */

Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@...il.com>
Signed-off-by: Ian Kent <raven@...maw.net>
---
 fs/autofs4/inode.c |   34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 61b2105..8357544 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -274,6 +274,23 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 		goto fail_dput;
 	}
 
+	/* Test versions first */
+	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
+	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
+		pr_err("kernel does not match daemon version "
+		       "daemon (%d, %d) kernel (%d, %d)\n",
+		       sbi->min_proto, sbi->max_proto,
+		       AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
+		goto fail_dput;
+	}
+
+	/* Establish highest kernel protocol version */
+	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
+		sbi->version = AUTOFS_MAX_PROTO_VERSION;
+	else
+		sbi->version = sbi->max_proto;
+	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
+
 	if (pgrp_set) {
 		sbi->oz_pgrp = find_get_pid(pgrp);
 		if (!sbi->oz_pgrp) {
@@ -291,23 +308,6 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 	root_inode->i_fop = &autofs4_root_operations;
 	root_inode->i_op = &autofs4_dir_inode_operations;
 
-	/* Couldn't this be tested earlier? */
-	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
-	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
-		pr_err("kernel does not match daemon version "
-		       "daemon (%d, %d) kernel (%d, %d)\n",
-		       sbi->min_proto, sbi->max_proto,
-		       AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
-		goto fail_dput;
-	}
-
-	/* Establish highest kernel protocol version */
-	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
-		sbi->version = AUTOFS_MAX_PROTO_VERSION;
-	else
-		sbi->version = sbi->max_proto;
-	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
-
 	pr_debug("pipe fd = %d, pgrp = %u\n", pipefd, pid_nr(sbi->oz_pgrp));
 	pipe = fget(pipefd);