nfs_ops.c

早期freebsd实现

}

/*-------------------------------------------------------------------------*/

/*
 * NFS needs the local filesystem, remote filesystem
 * remote hostname.
 * Local filesystem defaults to remote and vice-versa.
 */
static char *nfs_match(fo)
am_opts *fo;
{
	char *xmtab;
	if (fo->opt_fs && !fo->opt_rfs)
		fo->opt_rfs = fo->opt_fs;
	if (!fo->opt_rfs) {
		plog(XLOG_USER, "nfs: no remote filesystem specified");
		return FALSE;
	}
	if (!fo->opt_rhost) {
		plog(XLOG_USER, "nfs: no remote host specified");
		return FALSE;
	}
	/*
	 * Determine magic cookie to put in mtab
	 */
	xmtab = (char *) xmalloc(strlen(fo->opt_rhost) + strlen(fo->opt_rfs) + 2);
	sprintf(xmtab, "%s:%s", fo->opt_rhost, fo->opt_rfs);
#ifdef DEBUG
	dlog("NFS: mounting remote server \"%s\", remote fs \"%s\" on \"%s\"",
		fo->opt_rhost, fo->opt_rfs, fo->opt_fs);
#endif /* DEBUG */

	return xmtab;
}

/*
 * Initialise am structure for nfs
 */
static int nfs_init(mf)
mntfs *mf;
{
	if (!mf->mf_private) {
		int error;
		struct fhstatus fhs;
	
		char *colon = strchr(mf->mf_info, ':');
		if (colon == 0)
			return ENOENT;

		error = prime_nfs_fhandle_cache(colon+1, mf->mf_server, &fhs, (voidp) mf);
		if (!error) {
			mf->mf_private = (voidp) ALLOC(fhstatus);
			mf->mf_prfree = (void (*)()) free;
			bcopy((voidp) &fhs, mf->mf_private, sizeof(fhs));
		}
		return error;
	}

	return 0;
}

int mount_nfs_fh P((struct fhstatus *fhp, char *dir, char *fs_name, char *opts, mntfs *mf));
int mount_nfs_fh(fhp, dir, fs_name, opts, mf)
struct fhstatus *fhp;
char *dir;
char *fs_name;
char *opts;
mntfs *mf;
{
	struct nfs_args nfs_args;
	struct mntent mnt;
	int retry;
	char *colon;
	/*char *path;*/
	char host[MAXHOSTNAMELEN + MAXPATHLEN + 2];
	fserver *fs = mf->mf_server;
	int flags;
	char *xopts;
	int error;
#ifdef notdef
	unsigned short port;
#endif /* notdef */

	MTYPE_TYPE type = MOUNT_TYPE_NFS;

	bzero((voidp) &nfs_args, sizeof(nfs_args));	/* Paranoid */

	/*
	 * Extract host name to give to kernel
	 */
	if (!(colon = strchr(fs_name, ':')))
		return ENOENT;
#ifndef NFS_ARGS_NEEDS_PATH
	*colon = '\0';
#endif
	strncpy(host, fs_name, sizeof(host));
#ifndef NFS_ARGS_NEEDS_PATH
	*colon = ':';
#endif /* NFS_ARGS_NEEDS_PATH */
	/*path = colon + 1;*/

	if (mf->mf_remopts && *mf->mf_remopts && !islocalnet(fs->fs_ip->sin_addr.s_addr))
		xopts = strdup(mf->mf_remopts);
	else
		xopts = strdup(opts);

	bzero((voidp) &nfs_args, sizeof(nfs_args));

	mnt.mnt_dir = dir;
	mnt.mnt_fsname = fs_name;
	mnt.mnt_type = MTAB_TYPE_NFS;
	mnt.mnt_opts = xopts;
	mnt.mnt_freq = 0;
	mnt.mnt_passno = 0;

	retry = hasmntval(&mnt, "retry");
	if (retry <= 0)
		retry = 1;	/* XXX */

/*again:*/

	/*
	 * set mount args
	 */
	NFS_FH_DREF(nfs_args.fh, (NFS_FH_TYPE) fhp->fhstatus_u.fhs_fhandle);

#ifdef ULTRIX_HACK
	nfs_args.optstr = mnt.mnt_opts;
#endif /* ULTRIX_HACK */

	nfs_args.hostname = host;
	nfs_args.flags |= NFSMNT_HOSTNAME;
#ifdef HOSTNAMESZ
	/*
	 * Most kernels have a name length restriction.
	 */
	if (strlen(host) >= HOSTNAMESZ)
		strcpy(host + HOSTNAMESZ - 3, "..");
#endif /* HOSTNAMESZ */

	if (nfs_args.rsize = hasmntval(&mnt, "rsize"))
		nfs_args.flags |= NFSMNT_RSIZE;

	if (nfs_args.wsize = hasmntval(&mnt, "wsize"))
		nfs_args.flags |= NFSMNT_WSIZE;

	if (nfs_args.timeo = hasmntval(&mnt, "timeo"))
		nfs_args.flags |= NFSMNT_TIMEO;

	if (nfs_args.retrans = hasmntval(&mnt, "retrans"))
		nfs_args.flags |= NFSMNT_RETRANS;

#ifdef NFSMNT_BIODS
	if (nfs_args.biods = hasmntval(&mnt, "biods"))
		nfs_args.flags |= NFSMNT_BIODS;

#endif /* NFSMNT_BIODS */

#ifdef NFSMNT_MAXGRPS
	if (nfs_args.maxgrouplist = hasmntval(&mnt, "maxgroups"))
		nfs_args.flags |= NFSMNT_MAXGRPS;
#endif /* NFSMNT_MAXGRPS */

#ifdef notdef
/*
 * This isn't supported by the ping algorithm yet.
 * In any case, it is all done in nfs_init().
 */
 	if (port = hasmntval(&mnt, "port"))
		sin.sin_port = htons(port);
	else
		sin.sin_port = htons(NFS_PORT);	/* XXX should use portmapper */
#endif /* notdef */

	if (hasmntopt(&mnt, MNTOPT_SOFT) != NULL)
		nfs_args.flags |= NFSMNT_SOFT;

#ifdef NFSMNT_SPONGY
	if (hasmntopt(&mnt, "spongy") != NULL) {
		nfs_args.flags |= NFSMNT_SPONGY;
		if (nfs_args.flags & NFSMNT_SOFT) {
			plog(XLOG_USER, "Mount opts soft and spongy are incompatible - soft ignored");
			nfs_args.flags &= ~NFSMNT_SOFT;
		}
	}
#endif /* MNTOPT_SPONGY */

#ifdef MNTOPT_INTR
	if (hasmntopt(&mnt, MNTOPT_INTR) != NULL)
		nfs_args.flags |= NFSMNT_INT;
#endif /* MNTOPT_INTR */

#ifdef MNTOPT_NODEVS
	if (hasmntopt(&mnt, MNTOPT_NODEVS) != NULL)
		nfs_args.flags |= NFSMNT_NODEVS;
#endif /* MNTOPT_NODEVS */

#ifdef MNTOPT_COMPRESS
	if (hasmntopt(&mnt, "compress") != NULL)
		nfs_args.flags |= NFSMNT_COMPRESS;
#endif /* MNTOPT_COMPRESS */

#ifdef MNTOPT_NOCONN
	if (hasmntopt(&mnt, "noconn") != NULL)
		nfs_args.flags |= NFSMNT_NOCONN;
#endif /* MNTOPT_NOCONN */

#ifdef NFSMNT_PGTHRESH
	if (nfs_args.pg_thresh = hasmntval(&mnt, "pgthresh"))
		nfs_args.flags |= NFSMNT_PGTHRESH;
#endif /* NFSMNT_PGTHRESH */

	NFS_SA_DREF(nfs_args, fs->fs_ip);

	flags = compute_mount_flags(&mnt);

#ifdef NFSMNT_NOCTO
	if (hasmntopt(&mnt, "nocto") != NULL)
		nfs_args.flags |= NFSMNT_NOCTO;
#endif /* NFSMNT_NOCTO */

#ifdef HAS_TCP_NFS
	if (hasmntopt(&mnt, "tcp") != NULL)
		nfs_args.sotype = SOCK_STREAM;
#endif /* HAS_TCP_NFS */


#ifdef ULTRIX_HACK
	/*
	 * Ultrix passes the flags argument as part of the
	 * mount data structure, rather than using the
	 * flags argument to the system call.  This is
	 * confusing...
	 */
	if (!(nfs_args.flags & NFSMNT_PGTHRESH)) {
		nfs_args.pg_thresh = 64; /* 64k - XXX */
		nfs_args.flags |= NFSMNT_PGTHRESH;
	}
	nfs_args.gfs_flags = flags;
	flags &= M_RDONLY;
	if (flags & M_RDONLY)
		nfs_args.flags |= NFSMNT_RONLY;
#endif /* ULTRIX_HACK */

	error = mount_fs(&mnt, flags, (caddr_t) &nfs_args, retry, type);
	free(xopts);
	return error;
}

static int mount_nfs(dir, fs_name, opts, mf)
char *dir;
char *fs_name;
char *opts;
mntfs *mf;
{
#ifdef notdef
	int error;
	struct fhstatus fhs;
	char *colon;

	if (!(colon = strchr(fs_name, ':')))
		return ENOENT;

#ifdef DEBUG
	dlog("locating fhandle for %s", fs_name);
#endif /* DEBUG */
	error = prime_nfs_fhandle_cache(colon+1, mf->mf_server, &fhs, (voidp) 0);

	if (error)
		return error;

	return mount_nfs_fh(&fhs, dir, fs_name, opts, mf);
#endif
	if (!mf->mf_private) {
		plog(XLOG_ERROR, "Missing filehandle for %s", fs_name);
		return EINVAL;
	}

	return mount_nfs_fh((struct fhstatus *) mf->mf_private, dir, fs_name, opts, mf);
}

static int nfs_fmount(mf)
mntfs *mf;
{
	int error;

	error = mount_nfs(mf->mf_mount, mf->mf_info, mf->mf_mopts, mf);

#ifdef DEBUG
	if (error) {
		errno = error;
		dlog("mount_nfs: %m");
	}
#endif /* DEBUG */
	return error;
}

static int nfs_fumount(mf)
mntfs *mf;
{
	int error = UMOUNT_FS(mf->mf_mount);
	if (error)
		return error;

	return 0;
}

static void nfs_umounted(mp)
am_node *mp;
{
#ifdef INFORM_MOUNTD
	/*
	 * Don't bother to inform remote mountd
	 * that we are finished.  Until a full
	 * track of filehandles is maintained
	 * the mountd unmount callback cannot
	 * be done correctly anyway...
	 */

	mntfs *mf = mp->am_mnt;
	fserver *fs;
	char *colon, *path;

	if (mf->mf_error || mf->mf_refc > 1)
		return;

	fs = mf->mf_server;

	/*
	 * Call the mount daemon on the server to
	 * announce that we are not using the fs any more.
	 *
	 * This is *wrong*.  The mountd should be called
	 * when the fhandle is flushed from the cache, and
	 * a reference held to the cached entry while the
	 * fs is mounted...
	 */
	colon = path = strchr(mf->mf_info, ':');
	if (fs && colon) {
		fh_cache f;
#ifdef DEBUG
		dlog("calling mountd for %s", mf->mf_info);
#endif /* DEBUG */
		*path++ = '\0';
		f.fh_path = path;
		f.fh_sin = *fs->fs_ip;
		f.fh_sin.sin_port = (u_short) 0;
		f.fh_fs = fs;
		f.fh_id = 0;
		f.fh_error = 0;
		(void) prime_nfs_fhandle_cache(colon+1, mf->mf_server, (struct fhstatus *) 0, (voidp) mf);
		(void) call_mountd(&f, MOUNTPROC_UMNT, (fwd_fun) 0, (voidp) 0);
		*colon = ':';
	}
#endif /* INFORM_MOUNTD */

#ifdef KICK_KERNEL
	/* This should go into the mainline code, not in nfs_ops... */

	/*
	 * Run lstat over the underlying directory in
	 * case this was a direct mount.  This will
	 * get the kernel back in sync with reality.
	 */
	if (mp->am_parent && mp->am_parent->am_path &&
	    STREQ(mp->am_parent->am_mnt->mf_ops->fs_type, "direct")) {
		struct stat stb;
		int pid;
		if ((pid = background()) == 0) {
			if (lstat(mp->am_parent->am_path, &stb) < 0) {
				plog(XLOG_ERROR, "lstat(%s) after unmount: %m", mp->am_parent->am_path);
#ifdef DEBUG
			} else {
				dlog("hack lstat(%s): ok", mp->am_parent->am_path);
#endif /* DEBUG */
			}
			_exit(0);
		}
	}
#endif /* KICK_KERNEL */
}

/*
 * Network file system
 */
am_ops nfs_ops = {
	"nfs",
	nfs_match,
	nfs_init,
	auto_fmount,
	nfs_fmount,
	auto_fumount,
	nfs_fumount,
	efs_lookuppn,
	efs_readdir,
	0, /* nfs_readlink */
	0, /* nfs_mounted */
	nfs_umounted,
	find_nfs_srvr,
	FS_MKMNT|FS_BACKGROUND|FS_AMQINFO
};

#endif /* HAS_NFS */