4.3BSD-Reno/src/usr.sbin/amd/amd/mntfs.c

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/*
 * $Id: mntfs.c,v 5.2 90/06/23 22:19:40 jsp Rel $
 *
 * Copyright (c) 1990 Jan-Simon Pendry
 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry at Imperial College, London.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * Neither the name of the University nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)mntfs.c	5.1 (Berkeley) 6/29/90
 */

#include "am.h"

extern qelem mfhead;
qelem mfhead = { &mfhead, &mfhead };

int mntfs_allocated;

/*
 * This is the default attributes field which
 * is copied into every new node to be created.
 * The individual filesystem fs_init() routines
 * patch the copy to represent the particular
 * details for the relevant filesystem type
 */
static struct fattr gen_fattr = {
	NFDIR,				/* type */
	NFSMODE_DIR | 0555,		/* mode */
	2,				/* nlink */
	0,				/* uid */
	0,				/* gid */
	512,				/* size */
	4096,				/* blocksize */
	0,				/* rdev */
	1,				/* blocks */
	0,				/* fsid */
	0,				/* fileid */
	{ 0, 0 },			/* atime */
	{ 0, 0 },			/* mtime */
	{ 0, 0 },			/* ctime */
};

mntfs *dup_mntfs(mf)
mntfs *mf;
{
	if (mf->mf_refc == 0) {
		untimeout(mf->mf_cid);
		mf->mf_cid = 0;
		mf->mf_error = -1;
		mf->mf_flags &= ~MFF_ERROR;
	}
	mf->mf_refc++;
	return mf;
}

static init_mntfs(mf, ops, mo, mp, info, opts)
mntfs *mf;
am_ops *ops;
am_opts *mo;
char *mp;
char *info;
char *opts;
{
	mf->mf_ops = ops;
	mf->mf_fo = mo;
	mf->mf_mount = strdup(mp);
	mf->mf_info = strdup(info);
	mf->mf_opts = strdup(opts);
	mf->mf_refc = 1;
	mf->mf_flags = 0;
	mf->mf_error = -1;
	mf->mf_cid = 0;
	mf->mf_private = 0;
	mf->mf_prfree = 0;
	mf->mf_attr.status = NFS_OK;
	mf->mf_fattr = gen_fattr;
	mf->mf_fattr.fsid = 42;
	mf->mf_fattr.fileid = 0;
	mf->mf_fattr.atime.seconds = clocktime();
	mf->mf_fattr.atime.useconds = 0;
	mf->mf_fattr.mtime = mf->mf_fattr.ctime = mf->mf_fattr.atime;

	if (ops->ffserver)
		mf->mf_server = (*ops->ffserver)(mf);
	else
		mf->mf_server = 0;
}

static mntfs *alloc_mntfs(ops, mo, mp, info, opts)
am_ops *ops;
am_opts *mo;
char *mp;
char *info;
char *opts;
{
	mntfs *mf = ALLOC(mntfs);
	init_mntfs(mf, ops, mo, mp, info, opts);
	ins_que(&mf->mf_q, &mfhead);
	mntfs_allocated++;

	return mf;
}

mntfs *find_mntfs(ops, mo, mp, info, opts)
am_ops *ops;
am_opts *mo;
char *mp;
char *info;
char *opts;
{
	mntfs *mf;

#ifdef DEBUG
	dlog("Locating mntfs reference to %s", mp);
#endif /* DEBUG */
	ITER(mf, mntfs, &mfhead) {
		if (STREQ(mf->mf_mount, mp)) {
			/*
			 * Handle cases where error ops are involved
			 */
			if (ops == &efs_ops) {
				/*
				 * If the existing ops are not efs_ops
				 * then continue...
				 */
				if (mf->mf_ops != &efs_ops)
					continue;
			} else /* ops != &efs_ops */ {
				/*
				 * If the existing ops are efs_ops
				 * then continue...
				 */
				if (mf->mf_ops == &efs_ops)
					continue;
			}

			if ((mf->mf_flags & MFF_RESTART) && amd_state == Run) {
				/*
				 * Restart a previously mounted filesystem.
				 */
				mntfs *mf2 = alloc_mntfs(&ifs_ops, mo, mp, info, opts);
#ifdef DEBUG
				dlog("Restarting filesystem %s", mf->mf_mount);
#endif /* DEBUG */
				/*
				 * Remember who we are restarting
				 */
				mf2->mf_private = (voidp) dup_mntfs(mf);
				mf2->mf_prfree = free_mntfs;
				return mf2;
			}
			mf->mf_fo = mo;
			if (!(mf->mf_flags & (MFF_MOUNTED|MFF_MOUNTING|MFF_UNMOUNTING))) {
				fserver *fs;
				mf->mf_opts = strealloc(mf->mf_opts, opts);
				mf->mf_info = strealloc(mf->mf_info, info);
				fs = ops->ffserver ? (*ops->ffserver)(mf) : (fserver *) 0;
				if (mf->mf_server)
					free_srvr(mf->mf_server);
				mf->mf_server = fs;
			}
			return dup_mntfs(mf);
		}
	}

	return alloc_mntfs(ops, mo, mp, info, opts);
}

mntfs *new_mntfs()
{
	return alloc_mntfs(&efs_ops, (am_opts *) 0, "//nil//", ".", "");
}

static void uninit_mntfs(mf, rmd)
mntfs *mf;
int rmd;
{
	if (mf->mf_mount) free((voidp) mf->mf_mount);
	if (mf->mf_opts) free((voidp) mf->mf_opts);
	if (mf->mf_info) free((voidp) mf->mf_info);
	if (mf->mf_private && mf->mf_prfree)
		(*mf->mf_prfree)(mf->mf_private);
	/*
	 * Clean up any directories that were made
	 */
	if (rmd && (mf->mf_flags & MFF_MKMNT))
		rmdirs(mf->mf_mount);

	/*
	 * Clean up the file server
	 */
	if (mf->mf_server)
		free_srvr(mf->mf_server);

	/*
	 * Don't do a callback on this mount
	 */
	if (mf->mf_cid) {
		untimeout(mf->mf_cid);
		mf->mf_cid = 0;
	}
}

static void discard_mntfs(mf)
mntfs *mf;
{
	rem_que(&mf->mf_q);
	/*
	 * Free memory
	 */
	uninit_mntfs(mf, TRUE);
	free((voidp) mf);

	--mntfs_allocated;
}

void flush_mntfs()
{
	mntfs *mf;

	mf = FIRST(mntfs, &mfhead);
	while (mf != HEAD(mntfs, &mfhead)) {
		mntfs *mf2 = mf;
		mf = NEXT(mntfs, mf);
		if (mf2->mf_refc == 0 && mf2->mf_cid)
			discard_mntfs(mf2);
	}
}

void free_mntfs(mf)
mntfs *mf;
{
	if (--mf->mf_refc == 0) {
		if (mf->mf_flags & MFF_MOUNTED) {
			int quoted;
			mf->mf_flags &= ~MFF_MOUNTED;

			/*
			 * Record for posterity
			 */
			quoted = strchr(mf->mf_info, ' ') != 0;	/* cheap */
			plog(XLOG_INFO, "%s%s%s %sed fstype %s from %s",
				quoted ? "\"" : "",
				mf->mf_info,
				quoted ? "\"" : "",
				mf->mf_error ? "discard" : "unmount",
				mf->mf_ops->fs_type, mf->mf_mount);
		}

		if (mf->mf_ops->fs_flags & FS_DISCARD) {
#ifdef DEBUG
			dlog("Immediately discarding mntfs for %s", mf->mf_mount);
#endif /* DEBUG */
			discard_mntfs(mf);
		} else {
#ifdef DEBUG
			if (mf->mf_flags & MFF_RESTART) {
				dlog("Discarding remount hook for %s", mf->mf_mount);
			} else {
				dlog("Discarding last mntfs reference to %s fstype %s",
					mf->mf_mount, mf->mf_ops->fs_type);
			}
			if (mf->mf_flags & (MFF_MOUNTED|MFF_MOUNTING|MFF_UNMOUNTING))
				dlog("mntfs reference for %s still active", mf->mf_mount);
#endif /* DEBUG */
			mf->mf_cid = timeout(ALLOWED_MOUNT_TIME, discard_mntfs, (voidp) mf);
		}
	}
}

mntfs *realloc_mntfs(mf, ops, mo, mp, info, opts)
mntfs *mf;
am_ops *ops;
am_opts *mo;
char *mp;
char *info;
char *opts;
{
	mntfs *mf2;
	if (mf->mf_refc == 1 && mf->mf_ops == &ifs_ops && STREQ(mf->mf_mount, mp)) {
		/*
		 * If we are inheriting then just return
		 * the same node...
		 */
		return mf;
	}
	mf2 = find_mntfs(ops, mo, mp, info, opts);
	free_mntfs(mf);
	return mf2;
}