NetBSD/dist/am-utils/amd/amfs_toplvl.c

362 lines
11 KiB
C

/* $NetBSD: amfs_toplvl.c,v 1.1.1.4 2001/05/13 17:50:12 veego Exp $ */
/*
* Copyright (c) 1997-2001 Erez Zadok
* 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, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* %W% (Berkeley) %G%
*
* Id: amfs_toplvl.c,v 1.7.2.2 2001/04/14 21:08:20 ezk Exp
*
*/
/*
* Top-level file system
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
/****************************************************************************
*** FORWARD DEFINITIONS ***
****************************************************************************/
/****************************************************************************
*** OPS STRUCTURES ***
****************************************************************************/
am_ops amfs_toplvl_ops =
{
"toplvl",
amfs_auto_match,
0, /* amfs_auto_init */
amfs_toplvl_mount,
0,
amfs_toplvl_umount,
0,
amfs_auto_lookuppn,
amfs_auto_readdir, /* browsable version of readdir() */
0, /* amfs_toplvl_readlink */
amfs_toplvl_mounted,
0, /* amfs_toplvl_umounted */
find_amfs_auto_srvr,
FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY
};
/****************************************************************************
*** FUNCTIONS ***
****************************************************************************/
/*
* Mount an automounter directory.
* The automounter is connected into the system
* as a user-level NFS server. mount_amfs_toplvl constructs
* the necessary NFS parameters to be given to the
* kernel so that it will talk back to us.
*
* NOTE: automounter mounts in themselves are using NFS Version 2.
*/
static int
mount_amfs_toplvl(char *dir, char *opts)
{
char fs_hostname[MAXHOSTNAMELEN + MAXPATHLEN + 1];
int retry, error, genflags;
mntent_t mnt;
nfs_args_t nfs_args;
am_nfs_fh *fhp;
am_nfs_handle_t anh;
MTYPE_TYPE type = MOUNT_TYPE_NFS;
#ifndef HAVE_TRANSPORT_TYPE_TLI
u_short port;
struct sockaddr_in sin;
#endif /* not HAVE_TRANSPORT_TYPE_TLI */
memset((voidp) &mnt, 0, sizeof(mnt));
mnt.mnt_dir = dir;
mnt.mnt_fsname = pid_fsname;
mnt.mnt_opts = opts;
/*
* Make sure that amd's top-level NFS mounts are hidden by default
* from df.
* If they don't appear to support the either the "ignore" mnttab
* option entry, or the "auto" one, set the mount type to "nfs".
*/
mnt.mnt_type = HIDE_MOUNT_TYPE;
retry = hasmntval(&mnt, MNTTAB_OPT_RETRY);
if (retry <= 0)
retry = 2; /* XXX */
/*
* SET MOUNT ARGS
*/
/*
* get fhandle of remote path for automount point
*/
fhp = root_fh(dir);
if (!fhp) {
plog(XLOG_FATAL, "Can't find root file handle for %s", dir);
return EINVAL;
}
#ifndef HAVE_TRANSPORT_TYPE_TLI
/*
* Create sockaddr to point to the local machine. 127.0.0.1
* is not used since that will not work in HP-UX clusters and
* this is no more expensive.
*/
memset((voidp) &sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr = myipaddr;
port = hasmntval(&mnt, MNTTAB_OPT_PORT);
if (port) {
sin.sin_port = htons(port);
} else {
plog(XLOG_ERROR, "no port number specified for %s", dir);
return EINVAL;
}
#endif /* not HAVE_TRANSPORT_TYPE_TLI */
/*
* Make a ``hostname'' string for the kernel
*/
sprintf(fs_hostname, "pid%ld@%s:%s",
(long) (foreground ? am_mypid : getppid()),
am_get_hostname(),
dir);
/*
* Most kernels have a name length restriction (64 bytes)...
*/
if (strlen(fs_hostname) >= MAXHOSTNAMELEN)
strcpy(fs_hostname + MAXHOSTNAMELEN - 3, "..");
#ifdef HOSTNAMESZ
/*
* ... and some of these restrictions are 32 bytes (HOSTNAMESZ)
* If you need to get the definition for HOSTNAMESZ found, you may
* add the proper header file to the conf/nfs_prot/nfs_prot_*.h file.
*/
if (strlen(fs_hostname) >= HOSTNAMESZ)
strcpy(fs_hostname + HOSTNAMESZ - 3, "..");
#endif /* HOSTNAMESZ */
/*
* Finally we can compute the mount genflags set above,
* and add any automounter specific flags.
*/
genflags = compute_mount_flags(&mnt);
genflags |= compute_automounter_mount_flags(&mnt);
/* setup the many fields and flags within nfs_args */
memmove(&anh.v2.fhs_fh, fhp, sizeof(*fhp));
#ifdef HAVE_TRANSPORT_TYPE_TLI
compute_nfs_args(&nfs_args,
&mnt,
genflags,
nfsncp,
NULL, /* remote host IP addr is set below */
NFS_VERSION, /* version 2 */
"udp",
&anh,
fs_hostname,
pid_fsname);
/*
* IMPORTANT: set the correct IP address AFTERWARDS. It cannot
* be done using the normal mechanism of compute_nfs_args(), because
* that one will allocate a new address and use NFS_SA_DREF() to copy
* parts to it, while assuming that the ip_addr passed is always
* a "struct sockaddr_in". That assumption is incorrect on TLI systems,
* because they define a special macro HOST_SELF which is DIFFERENT
* than localhost (127.0.0.1)!
*/
nfs_args.addr = &nfsxprt->xp_ltaddr;
#else /* not HAVE_TRANSPORT_TYPE_TLI */
compute_nfs_args(&nfs_args,
&mnt,
genflags,
&sin,
NFS_VERSION, /* version 2 */
"udp",
&anh,
fs_hostname,
pid_fsname);
#endif /* not HAVE_TRANSPORT_TYPE_TLI */
/*************************************************************************
* NOTE: while compute_nfs_args() works ok for regular NFS mounts *
* the toplvl one is not, and so some options must be corrected by hand *
* more carefully, *after* compute_nfs_args() runs. *
*************************************************************************/
compute_automounter_nfs_args(&nfs_args, &mnt);
/* This is it! Here we try to mount amd on its mount points */
#ifdef DEBUG
amuDebug(D_TRACE) {
print_nfs_args(&nfs_args, 0);
plog(XLOG_DEBUG, "Generic mount flags 0x%x", genflags);
}
#endif /* DEBUG */
error = mount_fs(&mnt, genflags, (caddr_t) &nfs_args, retry, type,
0, NULL, mnttab_file_name);
#ifdef HAVE_TRANSPORT_TYPE_TLI
free_knetconfig(nfs_args.knconf);
/*
* local automounter mounts do not allocate a special address, so
* no need to XFREE(nfs_args.addr) under TLI.
*/
#endif /* HAVE_TRANSPORT_TYPE_TLI */
return error;
}
/*
* Mount the top-level
*/
int
amfs_toplvl_mount(am_node *mp)
{
mntfs *mf = mp->am_mnt;
struct stat stb;
char opts[256], preopts[256];
int error;
char *mnttype;
/*
* Mounting the automounter.
* Make sure the mount directory exists, construct
* the mount options and call the mount_amfs_toplvl routine.
*/
if (stat(mp->am_path, &stb) < 0) {
return errno;
} else if ((stb.st_mode & S_IFMT) != S_IFDIR) {
plog(XLOG_WARNING, "%s is not a directory", mp->am_path);
return ENOTDIR;
}
if (mf->mf_ops == &amfs_toplvl_ops)
mnttype = "indirect";
else if (mf->mf_ops == &amfs_direct_ops)
mnttype = "direct";
#ifdef HAVE_AMU_FS_UNION
else if (mf->mf_ops == &amfs_union_ops)
mnttype = "union";
#endif /* HAVE_AMU_FS_UNION */
else
mnttype = "auto";
/*
* Construct some mount options:
*
* Tack on magic map=<mapname> option in mtab to emulate
* SunOS automounter behavior.
*/
preopts[0] = '\0';
#ifdef MNTTAB_OPT_INTR
strcat(preopts, MNTTAB_OPT_INTR);
strcat(preopts, ",");
#endif /* MNTTAB_OPT_INTR */
#ifdef MNTTAB_OPT_IGNORE
strcat(preopts, MNTTAB_OPT_IGNORE);
strcat(preopts, ",");
#endif /* MNTTAB_OPT_IGNORE */
sprintf(opts, "%s%s,%s=%d,%s=%d,%s=%d,%s,map=%s",
preopts,
MNTTAB_OPT_RW,
MNTTAB_OPT_PORT, nfs_port,
MNTTAB_OPT_TIMEO, gopt.amfs_auto_timeo,
MNTTAB_OPT_RETRANS, gopt.amfs_auto_retrans,
mnttype, mf->mf_info);
/* now do the mount */
error = mount_amfs_toplvl(mf->mf_mount, opts);
if (error) {
errno = error;
plog(XLOG_FATAL, "amfs_toplvl_mount: mount_amfs_toplvl failed: %m");
return error;
}
return 0;
}
void
amfs_toplvl_mounted(mntfs *mf)
{
amfs_auto_mkcacheref(mf);
}
/*
* Unmount a top-level automount node
*/
int
amfs_toplvl_umount(am_node *mp)
{
int error;
struct stat stb;
again:
/*
* The lstat is needed if this mount is type=direct.
* When that happens, the kernel cache gets confused
* between the underlying type (dir) and the mounted
* type (link) and so needs to be re-synced before
* the unmount. This is all because the unmount system
* call follows links and so can't actually unmount
* a link (stupid!). It was noted that doing an ls -ld
* of the mount point to see why things were not working
* actually fixed the problem - so simulate an ls -ld here.
*/
if (lstat(mp->am_path, &stb) < 0) {
#ifdef DEBUG
dlog("lstat(%s): %m", mp->am_path);
#endif /* DEBUG */
}
error = UMOUNT_FS(mp->am_path, mnttab_file_name);
if (error == EBUSY) {
plog(XLOG_WARNING, "amfs_toplvl_unmount retrying %s in 1s", mp->am_path);
sleep(1); /* XXX */
goto again;
}
return error;
}