add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/proc_namespace.c
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@@ -37,23 +37,23 @@
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 	return res;
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 }
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-struct proc_fs_info {
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+struct proc_fs_opts {
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 	int flag;
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 	const char *str;
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 };
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 static int show_sb_opts(struct seq_file *m, struct super_block *sb)
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 {
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-	static const struct proc_fs_info fs_info[] = {
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+	static const struct proc_fs_opts fs_opts[] = {
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 		{ SB_SYNCHRONOUS, ",sync" },
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 		{ SB_DIRSYNC, ",dirsync" },
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 		{ SB_MANDLOCK, ",mand" },
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 		{ SB_LAZYTIME, ",lazytime" },
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 		{ 0, NULL }
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 	};
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-	const struct proc_fs_info *fs_infop;
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+	const struct proc_fs_opts *fs_infop;
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-	for (fs_infop = fs_info; fs_infop->flag; fs_infop++) {
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+	for (fs_infop = fs_opts; fs_infop->flag; fs_infop++) {
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 		if (sb->s_flags & fs_infop->flag)
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 			seq_puts(m, fs_infop->str);
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 	}
..
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@@ -63,18 +63,19 @@
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 static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
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 {
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-	static const struct proc_fs_info mnt_info[] = {
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+	static const struct proc_fs_opts mnt_opts[] = {
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 		{ MNT_NOSUID, ",nosuid" },
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 		{ MNT_NODEV, ",nodev" },
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 		{ MNT_NOEXEC, ",noexec" },
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 		{ MNT_NOATIME, ",noatime" },
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 		{ MNT_NODIRATIME, ",nodiratime" },
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 		{ MNT_RELATIME, ",relatime" },
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+		{ MNT_NOSYMFOLLOW, ",nosymfollow" },
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 		{ 0, NULL }
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 	};
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-	const struct proc_fs_info *fs_infop;
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+	const struct proc_fs_opts *fs_infop;
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-	for (fs_infop = mnt_info; fs_infop->flag; fs_infop++) {
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+	for (fs_infop = mnt_opts; fs_infop->flag; fs_infop++) {
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 		if (mnt->mnt_flags & fs_infop->flag)
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 			seq_puts(m, fs_infop->str);
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 	}
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@@ -88,7 +89,7 @@
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 static void show_type(struct seq_file *m, struct super_block *sb)
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 {
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 	mangle(m, sb->s_type->name);
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-	if (sb->s_subtype && sb->s_subtype[0]) {
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+	if (sb->s_subtype) {
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 		seq_putc(m, '.');
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 		mangle(m, sb->s_subtype);
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 	}
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@@ -121,9 +122,7 @@
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 	if (err)
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 		goto out;
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 	show_mnt_opts(m, mnt);
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-	if (sb->s_op->show_options2)
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-			err = sb->s_op->show_options2(mnt, m, mnt_path.dentry);
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-	else if (sb->s_op->show_options)
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+	if (sb->s_op->show_options)
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 		err = sb->s_op->show_options(m, mnt_path.dentry);
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 	seq_puts(m, " 0 0\n");
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 out:
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@@ -185,9 +184,7 @@
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 	err = show_sb_opts(m, sb);
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 	if (err)
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 		goto out;
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-	if (sb->s_op->show_options2) {
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-		err = sb->s_op->show_options2(mnt, m, mnt->mnt_root);
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-	} else if (sb->s_op->show_options)
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+	if (sb->s_op->show_options)
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 		err = sb->s_op->show_options(m, mnt->mnt_root);
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 	seq_putc(m, '\n');
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 out:
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@@ -283,7 +280,8 @@
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 	p->ns = ns;
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 	p->root = root;
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 	p->show = show;
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-	p->cached_event = ~0ULL;
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+	INIT_LIST_HEAD(&p->cursor.mnt_list);
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+	p->cursor.mnt.mnt_flags = MNT_CURSOR;
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 	return 0;
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..
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@@ -300,6 +298,7 @@
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 	struct seq_file *m = file->private_data;
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 	struct proc_mounts *p = m->private;
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 	path_put(&p->root);
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+	mnt_cursor_del(p->ns, &p->cursor);
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 	put_mnt_ns(p->ns);
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 	return seq_release_private(inode, file);
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 }
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@@ -321,7 +320,8 @@
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 const struct file_operations proc_mounts_operations = {
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 	.open		= mounts_open,
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-	.read		= seq_read,
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+	.read_iter	= seq_read_iter,
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+	.splice_read	= generic_file_splice_read,
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 	.llseek		= seq_lseek,
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 	.release	= mounts_release,
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 	.poll		= mounts_poll,
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@@ -329,7 +329,8 @@
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 const struct file_operations proc_mountinfo_operations = {
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 	.open		= mountinfo_open,
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-	.read		= seq_read,
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+	.read_iter	= seq_read_iter,
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+	.splice_read	= generic_file_splice_read,
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 	.llseek		= seq_lseek,
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 	.release	= mounts_release,
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 	.poll		= mounts_poll,
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@@ -337,7 +338,8 @@
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 const struct file_operations proc_mountstats_operations = {
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 	.open		= mountstats_open,
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-	.read		= seq_read,
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+	.read_iter	= seq_read_iter,
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+	.splice_read	= generic_file_splice_read,
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 	.llseek		= seq_lseek,
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 	.release	= mounts_release,
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 };