+ autofs-test-autofs-versions-first-on-sb-initialization.patch added to -mm tree

+ autofs-test-autofs-versions-first-on-sb-initialization.patch added to -mm tree

[akpm]

The patch titled
     Subject: autofs: test autofs versions first on sb initialization
has been added to the -mm tree.  Its filename is
     autofs-test-autofs-versions-first-on-sb-initialization.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/autofs-test-autofs-versions-first-on-sb-initialization.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/autofs-test-autofs-versions-first-on-sb-initialization.patch

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------------------------------------------------------
From: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Subject: autofs: test autofs versions first on sb initialization

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? */

Link: http://lkml.kernel.org/r/20160812024744.12352.43075.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/autofs4/inode.c |   34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff -puN fs/autofs4/inode.c~autofs-test-autofs-versions-first-on-sb-initialization fs/autofs4/inode.c
--- a/fs/autofs4/inode.c~autofs-test-autofs-versions-first-on-sb-initialization
+++ a/fs/autofs4/inode.c
@@ -274,6 +274,23 @@ int autofs4_fill_super(struct super_bloc
 		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_bloc
 	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;