NetBSD/sys/compat/ultrix/ultrix_fs.c

/*	$NetBSD: ultrix_fs.c,v 1.1 1995/12/26 04:44:37 jonathan Exp $	*/

/*
 * Copyright (c) 1995
 *	Jonathan Stone (hereinafter referred to as the author)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mount.h>

#include <compat/ultrix/ultrix_syscallargs.h>

#define	ULTRIX_MAXPATHLEN	1024

/**
 ** Ultrix filesystem operations: mount(), getmnt().
 ** These are included purely so one can place an (ECOFF or ELF)
 ** NetBSD/pmax kernel in an Ultrix root filesystem, boot it,
 ** and over-write the Ultrix root parition with NetBSD binaries.
 **/

/*
 * Ultrix file system data structure, as modified by
 * Ultrix getmntent(). This  structure is padded to 2560 bytes, for
 * compatiblity with the size the Ultrix kernel and user apps expect.
 */
struct ultrix_fs_data {
	u_int32_t	ufsd_flags;	/* how mounted */
	u_int32_t	ufsd_mtsize;	/* max transfer size in bytes */
	u_int32_t	ufsd_otsize;	/* optimal transfer size in bytes */
	u_int32_t	ufsd_bsize;	/* fs block size (bytes) for vm code */
	u_int32_t	ufsd_fstype;	/* see ../h/fs_types.h  */
	u_int32_t	ufsd_gtot;	/* total number of gnodes */
	u_int32_t	ufsd_gfree;	/* # of free gnodes */
	u_int32_t	ufsd_btot;	/* total number of 1K blocks */
	u_int32_t	ufsd_bfree;	/* # of free 1K blocks */
	u_int32_t	ufsd_bfreen;	/* user consumable 1K blocks */
	u_int32_t	ufsd_pgthresh;	/* min size in bytes before paging*/
	int32_t		ufsd_uid;	/* uid that mounted me */
	int16_t		ufsd_dev;	/* major/minor of fs */
	int16_t		ufsd_exroot;	/* root mapping from exports */
	char		ufsd_devname[ULTRIX_MAXPATHLEN + 4]; /* name of dev */
	char		ufsd_path[ULTRIX_MAXPATHLEN + 4]; /* name of mnt point */
	u_int32_t	ufsd_nupdate;	/* number of writes */
	u_int32_t	ufsd_pad[112];	/* pad to 2560 bytes. */
};

/*
 * Get statistics on mounted filesystems.
 */
#if 0
struct ultrix_getmnt_args {
	int32_t *start;
	struct ultrix_fs_data *buf;
	int32_t bufsize;
	int32_t mode;
	char *path;
};

#endif
/*
 * Ultrix getmnt() flags.
 * The operation getmnt() should perform is incoded in the flag
 * argument.  There are two independent attributes.
 *
 * ULTRIX_NOSTAT_xxx will never hang, but it may not return
 * up-to-date statistics. (For NFS clients, it returns whatever is
 * in the cache.) ULTRIX_STAT_xxx returns up-to-date info but may
 * hang (e.g., on dead NFS servers).
 *
 * ULTRIX_xxSTAT_ONE returns statistics on just one filesystem, determined
 * by the parth argument.  ULTRIX_xxSTAT_MANY ignores the path argument and
 * returns info on as many  filesystems fit in the structure.
 * the start argument, which should be zero on the first call,
 * can be used to iterate over all filesystems.
 *
 */
#define	ULTRIX_NOSTAT_MANY	1
#define	ULTRIX_STAT_MANY	2
#define	ULTRIX_STAT_ONE		3
#define	ULTRIX_NOSTAT_ONE	4

/*
 * Ultrix gnode-layer  filesystem codes.
 */
#define ULTRIX_FSTYPE_UNKNOWN	0x0
#define ULTRIX_FSTYPE_ULTRIX	0x1	/* 4.2bsd ffs */
#define ULTRIX_FSTYPE_NFS	0x5	/*  NFS v2 */

/*
 * Construct an Ultrix getmnt() ultrix_fs_data from the native NetBSD
 * struct statfs.
 */
static void
make_ultrix_mntent(sp, tem)
	register struct statfs *sp;
	register struct ultrix_fs_data *tem;
{

	tem->ufsd_mtsize = sp->f_bsize;		/* XXX max transfer size */
	tem->ufsd_flags = sp->f_flags;		/* XXX translate */
	tem->ufsd_otsize = sp->f_iosize;
	tem->ufsd_bsize = sp->f_bsize;
	/*
	 * Translate file system type. NetBSD/1.1 seems to always
	 * have f_type zero.
	 */
	tem->ufsd_fstype = ULTRIX_FSTYPE_NFS;	/* a hack */

	tem->ufsd_gtot = 0;			/* XXX kept where? superblk? */
	tem->ufsd_gfree = sp->f_ffree;
	tem->ufsd_bfree = sp->f_bfree;		/* free 1k blocks */
	tem->ufsd_bfreen = sp->f_bfree;		/* blocks available to users */
	tem->ufsd_pgthresh = 0;			/* not relevant */
	tem->ufsd_uid = 0;			/* XXX kept where ?*/
	tem->ufsd_dev = 0;			/* ?? */
	tem->ufsd_exroot  = 0;			/* ?? */
	strncpy(tem->ufsd_path, sp->f_mntonname, ULTRIX_MAXPATHLEN);
	strncpy(tem->ufsd_devname, sp->f_mntfromname, ULTRIX_MAXPATHLEN);
	printf("mntent: %s type %d\n", tem->ufsd_devname, tem->ufsd_fstype);
}

int
ultrix_sys_getmnt(p, v, retval)
	struct proc *p;
	void *v;
	int *retval;
{
	struct ultrix_sys_getmnt_args *uap = v;
	struct mount *mp, *nmp;
	struct statfs *sp;
	struct ultrix_fs_data *sfsp;
	char *path;
	int mntflags;
	int skip;
	int start;
	long count, maxcount;
	int error = 0;

	path = NULL;
	error = 0;
	maxcount = SCARG(uap, bufsize) / sizeof(struct ultrix_fs_data);
	sfsp = SCARG(uap, buf);

	if (SCARG(uap, mode) == ULTRIX_STAT_ONE ||
	    SCARG(uap, mode) == ULTRIX_STAT_MANY)
		mntflags = MNT_WAIT;
	else
		mntflags = MNT_NOWAIT;

	if (SCARG(uap, mode) == ULTRIX_STAT_ONE || SCARG(uap, mode) == ULTRIX_NOSTAT_ONE) {
		/*
		 * Only get info on mountpoints that matches the path
		 * provided.
		 */
		MALLOC(path, char *, MAXPATHLEN, M_TEMP, M_WAITOK);
		if (error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL))
			goto bad;
		maxcount = 1;
	} else {
		/*
		 * Get info on any mountpoints, somewhat like readdir().
		 * Find out how many mount list entries to skip, and skip
		 * them.
		 */
		if (error =
		    copyin((caddr_t)SCARG(uap, start), &start,
					  sizeof(*SCARG(uap, start))))
			goto bad;
		for (skip = start, mp = mountlist.cqh_first;
		    mp != (void*)&mountlist && skip-- > 0; mp = nmp)
			nmp = mp->mnt_list.cqe_next;
	}

	for (count = 0, mp = mountlist.cqh_first;
	    mp != (void*)&mountlist && count < maxcount; mp = nmp) {
		nmp = mp->mnt_list.cqe_next;
		if (sfsp != NULL && (mp->mnt_flag & MNT_MLOCK) == 0) {
			struct ultrix_fs_data tem;
			sp = &mp->mnt_stat;

			/*
			 * If requested, refresh the fsstat cache.
			 */
			if ((mntflags & MNT_WAIT) != 0 &&
			    (error = VFS_STATFS(mp, sp, p)) != 0)
				continue;

			/*
			 * XXX what does this do? -- cgd
			 */
			sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
			if (path == NULL ||
			    strcmp(path, sp->f_mntonname) == 0) {
				make_ultrix_mntent(sp, &tem);
				if (error =
				    copyout((caddr_t)&tem, sfsp, sizeof(tem)))
					goto bad;
				sfsp++;
				count++;
			}
		}
	}

	if (sfsp != NULL && count > maxcount)
		*retval = maxcount;
	else
		*retval = count;

bad:
	if (path)
		FREE(path, M_TEMP);
	return (error);
}