strace/mount.c

#include "defs.h"

#define MS_MGC_VAL	0xc0ed0000	/* old magic mount flag number */
#define MS_MGC_MSK	0xffff0000	/* old magic mount flag mask */

#include "xlat/mount_flags.h"

SYS_FUNC(mount)
{
	if (entering(tcp)) {
		bool ignore_type = false;
		bool ignore_data = false;
		bool old_magic = false;
		unsigned long flags = tcp->u_arg[3];

		/* Discard magic */
		if ((flags & MS_MGC_MSK) == MS_MGC_VAL) {
			flags &= ~MS_MGC_MSK;
			old_magic = true;
		}

		if (flags & MS_REMOUNT)
			ignore_type = true;
		else if (flags & (MS_BIND | MS_MOVE | MS_SHARED
				  | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
			ignore_type = ignore_data = true;

		printpath(tcp, tcp->u_arg[0]);
		tprints(", ");

		printpath(tcp, tcp->u_arg[1]);
		tprints(", ");

		if (ignore_type)
			printaddr(tcp->u_arg[2]);
		else
			printstr(tcp, tcp->u_arg[2], -1);
		tprints(", ");

		if (old_magic) {
			tprints("MS_MGC_VAL");
			if (flags)
				tprints("|");
		}
		if (flags || !old_magic)
			printflags(mount_flags, flags, "MS_???");
		tprints(", ");

		if (ignore_data)
			printaddr(tcp->u_arg[4]);
		else
			printstr(tcp, tcp->u_arg[4], -1);
	}
	return 0;
}