commit 436058a49e0fb91c74454dbee9cfee6fb53b4336
author David Howells <dhowells@redhat.com> Thu Apr 26 15:56:24 2007 -0700
committer David S. Miller <davem@davemloft.net> Thu Apr 26 15:56:24 2007 -0700
tree c10043dd582cf9697c0a042427f48af6d2e87e0c
parent 63b6be55e8b51cb718468794d343058e96c7462c

[AFS]: Handle multiple mounts of an AFS superblock correctly.

Handle multiple mounts of an AFS superblock correctly, checking to see
whether the superblock is already initialised after calling sget()
rather than just unconditionally stamping all over it.

Also delete the "silent" parameter to afs_fill_super() as it's not
used and can, in any case, be obtained from sb->s_flags.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

fs/afs/super.c

diff --git a/fs/afs/super.c b/fs/afs/super.c
index efc4fe6..77e6875 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -212,7 +212,7 @@
 /*
  * fill in the superblock
  */
-static int afs_fill_super(struct super_block *sb, void *data, int silent)
+static int afs_fill_super(struct super_block *sb, void *data)
 {
 	struct afs_mount_params *params = data;
 	struct afs_super_info *as = NULL;
@@ -319,17 +319,23 @@
 		goto error;
 	}
 
-	sb->s_flags = flags;
-
-	ret = afs_fill_super(sb, &params, flags & MS_SILENT ? 1 : 0);
-	if (ret < 0) {
-		up_write(&sb->s_umount);
-		deactivate_super(sb);
-		goto error;
+	if (!sb->s_root) {
+		/* initial superblock/root creation */
+		_debug("create");
+		sb->s_flags = flags;
+		ret = afs_fill_super(sb, &params);
+		if (ret < 0) {
+			up_write(&sb->s_umount);
+			deactivate_super(sb);
+			goto error;
+		}
+		sb->s_flags |= MS_ACTIVE;
+	} else {
+		_debug("reuse");
+		ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
 	}
-	sb->s_flags |= MS_ACTIVE;
-	simple_set_mnt(mnt, sb);
 
+	simple_set_mnt(mnt, sb);
 	afs_put_volume(params.volume);
 	afs_put_cell(params.default_cell);
 	_leave(" = 0 [%p]", sb);