virtiofs: get rid of no_mount_options

This option was introduced so that for virtio_fs we don't show any mounts
options fuse_show_options(). Because we don't offer any of these options
to be controlled by mounter.

Very soon we are planning to introduce option "dax" which mounter should
be able to specify. And no_mount_options does not work anymore.


Signed-off-by: Vivek Goyal <[e-mail]>
Signed-off-by: Miklos Szeredi <[e-mail]>

fs/fuse/fuse_i.h

···
 	bool destroy:1;
 	bool no_control:1;
 	bool no_force_umount:1;
-	bool no_mount_options:1;
+	bool legacy_opts_show:1;
 	unsigned int max_read;
 	unsigned int blksize;
 	const char *subtype;
···
 	/** cache READLINK responses in page cache */
 	unsigned cache_symlinks:1;
 
+	/* show legacy mount options */
+	unsigned int legacy_opts_show:1;
+
 	/*
 	 * The following bitfields are only for optimization purposes
 	 * and hence races in setting them will not cause malfunction
···
 
 	/** Do not allow MNT_FORCE umount */
 	unsigned int no_force_umount:1;
-
-	/* Do not show mount options */
-	unsigned int no_mount_options:1;
 
 	/** The number of requests waiting for completion */
 	atomic_t num_waiting;

fs/fuse/inode.c

···
 	struct super_block *sb = root->d_sb;
 	struct fuse_conn *fc = get_fuse_conn_super(sb);
 
-	if (fc->no_mount_options)
-		return 0;
-
-	seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id));
-	seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id));
-	if (fc->default_permissions)
-		seq_puts(m, ",default_permissions");
-	if (fc->allow_other)
-		seq_puts(m, ",allow_other");
-	if (fc->max_read != ~0)
-		seq_printf(m, ",max_read=%u", fc->max_read);
-	if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
-		seq_printf(m, ",blksize=%lu", sb->s_blocksize);
+	if (fc->legacy_opts_show) {
+		seq_printf(m, ",user_id=%u",
+			   from_kuid_munged(fc->user_ns, fc->user_id));
+		seq_printf(m, ",group_id=%u",
+			   from_kgid_munged(fc->user_ns, fc->group_id));
+		if (fc->default_permissions)
+			seq_puts(m, ",default_permissions");
+		if (fc->allow_other)
+			seq_puts(m, ",allow_other");
+		if (fc->max_read != ~0)
+			seq_printf(m, ",max_read=%u", fc->max_read);
+		if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
+			seq_printf(m, ",blksize=%lu", sb->s_blocksize);
+	}
 	return 0;
 }
 
···
 	fc->allow_other = ctx->allow_other;
 	fc->user_id = ctx->user_id;
 	fc->group_id = ctx->group_id;
+	fc->legacy_opts_show = ctx->legacy_opts_show;
 	fc->max_read = max_t(unsigned, 4096, ctx->max_read);
 	fc->destroy = ctx->destroy;
 	fc->no_control = ctx->no_control;
 	fc->no_force_umount = ctx->no_force_umount;
-	fc->no_mount_options = ctx->no_mount_options;
 
 	err = -ENOMEM;
 	root = fuse_get_root_inode(sb, ctx->rootmode);
···
 
 	ctx->max_read = ~0;
 	ctx->blksize = FUSE_DEFAULT_BLKSIZE;
+	ctx->legacy_opts_show = true;
 
 #ifdef CONFIG_BLOCK
 	if (fc->fs_type == &fuseblk_fs_type) {

fs/fuse/virtio_fs.c

···
 		.destroy = true,
 		.no_control = true,
 		.no_force_umount = true,
-		.no_mount_options = true,
 	};
 
 	mutex_lock(&virtio_fs_mutex);