SELinux: use a helper function to determine seclabel

Use a helper to determine if a superblock should have the seclabel flag
rather than doing it in the function.  I'm going to use this in the
security server as well.

Signed-off-by: Eric Paris <eparis@redhat.com>

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ec15a5694b9e8d703233711f126f244b54c3b945..b222e966babeec0037d2dbd631e7f5d2b65eedcb 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -354,6 +354,29 @@ static int may_context_mount_inode_relabel(u32 sid,
        return rc;
 }
 
+static int selinux_is_sblabel_mnt(struct super_block *sb)
+{
+       struct superblock_security_struct *sbsec = sb->s_security;
+
+       if (sbsec->behavior == SECURITY_FS_USE_XATTR ||
+           sbsec->behavior == SECURITY_FS_USE_TRANS ||
+           sbsec->behavior == SECURITY_FS_USE_TASK)
+               return 1;
+
+       /* Special handling for sysfs. Is genfs but also has setxattr handler*/
+       if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
+               return 1;
+
+       /*
+        * Special handling for rootfs. Is genfs but supports
+        * setting SELinux context on in-core inodes.
+        */
+       if (strncmp(sb->s_type->name, "rootfs", sizeof("rootfs")) == 0)
+               return 1;
+
+       return 0;
+}
+
 static int sb_finish_set_opts(struct super_block *sb)
 {
        struct superblock_security_struct *sbsec = sb->s_security;
@@ -396,20 +419,7 @@ static int sb_finish_set_opts(struct super_block *sb)
                       labeling_behaviors[sbsec->behavior-1]);
 
        sbsec->flags |= SE_SBINITIALIZED;
-       if (sbsec->behavior == SECURITY_FS_USE_XATTR ||
-           sbsec->behavior == SECURITY_FS_USE_TRANS ||
-           sbsec->behavior == SECURITY_FS_USE_TASK)
-               sbsec->flags |= SBLABEL_MNT;
-
-       /* Special handling for sysfs. Is genfs but also has setxattr handler*/
-       if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
-               sbsec->flags |= SBLABEL_MNT;
-
-       /*
-        * Special handling for rootfs. Is genfs but supports
-        * setting SELinux context on in-core inodes.
-        */
-       if (strncmp(sb->s_type->name, "rootfs", sizeof("rootfs")) == 0)
+       if (selinux_is_sblabel_mnt(sb))
                sbsec->flags |= SBLABEL_MNT;
 
        /* Initialize the root inode. */