fix umask when noACL kernel meets extN tuned for ACLs

Fix insecure default behaviour reported by Tigran Aivazian: if an
ext2 or ext3 filesystem is tuned to mount with "acl", but mounted by
a kernel built without ACL support, then umask was ignored when creating
inodes - though root or user has umask 022, touch creates files as 0666,
and mkdir creates directories as 0777.

This appears to have worked right until 2.6.11, when a fix to the default
mode on symlinks (always 0777) assumed VFS applies umask: which it does,
unless the mount is marked for ACLs; but ext[23] set MS_POSIXACL in
s_flags according to s_mount_opt set according to def_mount_opts.

We could revert to the 2.6.10 ext[23]_init_acl (adding an S_ISLNK test);
but other filesystems only set MS_POSIXACL when ACLs are configured.  We
could fix this at another level; but it seems most robust to avoid setting
the s_mount_opt flag in the first place (at the expense of more ifdefs).

Likewise don't set the XATTR_USER flag when built without XATTR support.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

fs/ext2/super.c

@@ -706,10 +706,14 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 		set_opt(sbi->s_mount_opt, GRPID);
 	if (def_mount_opts & EXT2_DEFM_UID16)
 		set_opt(sbi->s_mount_opt, NO_UID32);
+#ifdef CONFIG_EXT2_FS_XATTR
 	if (def_mount_opts & EXT2_DEFM_XATTR_USER)
 		set_opt(sbi->s_mount_opt, XATTR_USER);
+#endif
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
 	if (def_mount_opts & EXT2_DEFM_ACL)
 		set_opt(sbi->s_mount_opt, POSIX_ACL);
+#endif
 	
 	if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
 		set_opt(sbi->s_mount_opt, ERRORS_PANIC);

fs/ext3/super.c

@@ -1444,10 +1444,14 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 		set_opt(sbi->s_mount_opt, GRPID);
 	if (def_mount_opts & EXT3_DEFM_UID16)
 		set_opt(sbi->s_mount_opt, NO_UID32);
+#ifdef CONFIG_EXT3_FS_XATTR
 	if (def_mount_opts & EXT3_DEFM_XATTR_USER)
 		set_opt(sbi->s_mount_opt, XATTR_USER);
+#endif
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
 	if (def_mount_opts & EXT3_DEFM_ACL)
 		set_opt(sbi->s_mount_opt, POSIX_ACL);
+#endif
 	if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
 		sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
 	else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)