549 lines
14 KiB
C
549 lines
14 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2011 Lawrence Livermore National Security, LLC.
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*/
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#include <libintl.h>
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#include <unistd.h>
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#include <sys/file.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <libzfs.h>
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#include <locale.h>
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#ifdef HAVE_LIBSELINUX
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#include <selinux/selinux.h>
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#endif /* HAVE_LIBSELINUX */
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libzfs_handle_t *g_zfs;
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typedef struct option_map {
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const char *name;
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unsigned long mntmask;
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unsigned long zfsmask;
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} option_map_t;
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static const option_map_t option_map[] = {
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/* Canonicalized filesystem independent options from mount(8) */
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{ MNTOPT_NOAUTO, MS_COMMENT, ZS_COMMENT },
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{ MNTOPT_DEFAULTS, MS_COMMENT, ZS_COMMENT },
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{ MNTOPT_NODEVICES, MS_NODEV, ZS_COMMENT },
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{ MNTOPT_DIRSYNC, MS_DIRSYNC, ZS_COMMENT },
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{ MNTOPT_NOEXEC, MS_NOEXEC, ZS_COMMENT },
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{ MNTOPT_GROUP, MS_GROUP, ZS_COMMENT },
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{ MNTOPT_NETDEV, MS_COMMENT, ZS_COMMENT },
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{ MNTOPT_NOFAIL, MS_COMMENT, ZS_COMMENT },
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{ MNTOPT_NOSUID, MS_NOSUID, ZS_COMMENT },
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{ MNTOPT_OWNER, MS_OWNER, ZS_COMMENT },
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{ MNTOPT_REMOUNT, MS_REMOUNT, ZS_COMMENT },
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{ MNTOPT_RO, MS_RDONLY, ZS_COMMENT },
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{ MNTOPT_RW, MS_COMMENT, ZS_COMMENT },
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{ MNTOPT_SYNC, MS_SYNCHRONOUS, ZS_COMMENT },
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{ MNTOPT_USER, MS_USERS, ZS_COMMENT },
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{ MNTOPT_USERS, MS_USERS, ZS_COMMENT },
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#ifdef MS_NOATIME
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{ MNTOPT_NOATIME, MS_NOATIME, ZS_COMMENT },
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#endif
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#ifdef MS_NODIRATIME
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{ MNTOPT_NODIRATIME, MS_NODIRATIME, ZS_COMMENT },
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#endif
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#ifdef MS_RELATIME
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{ MNTOPT_RELATIME, MS_RELATIME, ZS_COMMENT },
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#endif
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#ifdef MS_STRICTATIME
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{ MNTOPT_DFRATIME, MS_STRICTATIME, ZS_COMMENT },
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#endif
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{ MNTOPT_CONTEXT, MS_COMMENT, ZS_NOCONTEXT },
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{ MNTOPT_NOCONTEXT, MS_COMMENT, ZS_NOCONTEXT },
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{ MNTOPT_FSCONTEXT, MS_COMMENT, ZS_NOCONTEXT },
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{ MNTOPT_DEFCONTEXT, MS_COMMENT, ZS_NOCONTEXT },
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{ MNTOPT_ROOTCONTEXT, MS_COMMENT, ZS_NOCONTEXT },
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#ifdef MS_I_VERSION
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{ MNTOPT_IVERSION, MS_I_VERSION, ZS_COMMENT },
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#endif
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#ifdef MS_MANDLOCK
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{ MNTOPT_NBMAND, MS_MANDLOCK, ZS_COMMENT },
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#endif
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/* Valid options not found in mount(8) */
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{ MNTOPT_BIND, MS_BIND, ZS_COMMENT },
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#ifdef MS_REC
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{ MNTOPT_RBIND, MS_BIND|MS_REC, ZS_COMMENT },
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#endif
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{ MNTOPT_COMMENT, MS_COMMENT, ZS_COMMENT },
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#ifdef MS_NOSUB
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{ MNTOPT_NOSUB, MS_NOSUB, ZS_COMMENT },
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#endif
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#ifdef MS_SILENT
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{ MNTOPT_QUIET, MS_SILENT, ZS_COMMENT },
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#endif
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/* Custom zfs options */
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{ MNTOPT_XATTR, MS_COMMENT, ZS_COMMENT },
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{ MNTOPT_NOXATTR, MS_COMMENT, ZS_COMMENT },
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{ MNTOPT_ZFSUTIL, MS_COMMENT, ZS_ZFSUTIL },
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{ NULL, 0, 0 } };
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/*
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* Break the mount option in to a name/value pair. The name is
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* validated against the option map and mount flags set accordingly.
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*/
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static int
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parse_option(char *mntopt, unsigned long *mntflags,
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unsigned long *zfsflags, int sloppy)
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{
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const option_map_t *opt;
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char *ptr, *name, *value = NULL;
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int error = 0;
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name = strdup(mntopt);
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if (name == NULL)
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return (ENOMEM);
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for (ptr = name; ptr && *ptr; ptr++) {
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if (*ptr == '=') {
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*ptr = '\0';
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value = ptr+1;
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VERIFY3P(value, !=, NULL);
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break;
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}
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}
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for (opt = option_map; opt->name != NULL; opt++) {
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if (strncmp(name, opt->name, strlen(name)) == 0) {
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*mntflags |= opt->mntmask;
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*zfsflags |= opt->zfsmask;
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error = 0;
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goto out;
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}
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}
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if (!sloppy)
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error = ENOENT;
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out:
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/* If required further process on the value may be done here */
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free(name);
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return (error);
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}
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/*
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* Translate the mount option string in to MS_* mount flags for the
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* kernel vfs. When sloppy is non-zero unknown options will be ignored
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* otherwise they are considered fatal are copied in to badopt.
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*/
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static int
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parse_options(char *mntopts, unsigned long *mntflags, unsigned long *zfsflags,
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int sloppy, char *badopt, char *mtabopt)
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{
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int error = 0, quote = 0, flag = 0, count = 0;
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char *ptr, *opt, *opts;
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opts = strdup(mntopts);
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if (opts == NULL)
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return (ENOMEM);
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*mntflags = 0;
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opt = NULL;
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/*
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* Scan through all mount options which must be comma delimited.
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* We must be careful to notice regions which are double quoted
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* and skip commas in these regions. Each option is then checked
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* to determine if it is a known option.
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*/
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for (ptr = opts; ptr && !flag; ptr++) {
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if (opt == NULL)
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opt = ptr;
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if (*ptr == '"')
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quote = !quote;
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if (quote)
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continue;
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if (*ptr == '\0')
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flag = 1;
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if ((*ptr == ',') || (*ptr == '\0')) {
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*ptr = '\0';
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error = parse_option(opt, mntflags, zfsflags, sloppy);
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if (error) {
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strcpy(badopt, opt);
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goto out;
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}
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if (!(*mntflags & MS_REMOUNT) &&
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!(*zfsflags & ZS_ZFSUTIL)) {
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if (count > 0)
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strlcat(mtabopt, ",", MNT_LINE_MAX);
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strlcat(mtabopt, opt, MNT_LINE_MAX);
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count++;
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}
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opt = NULL;
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}
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}
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out:
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free(opts);
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return (error);
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}
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/*
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* Return the pool/dataset to mount given the name passed to mount. This
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* is expected to be of the form pool/dataset, however may also refer to
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* a block device if that device contains a valid zfs label.
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*/
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static char *
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parse_dataset(char *dataset)
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{
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char cwd[PATH_MAX];
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struct stat64 statbuf;
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int error;
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int len;
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/*
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* We expect a pool/dataset to be provided, however if we're
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* given a device which is a member of a zpool we attempt to
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* extract the pool name stored in the label. Given the pool
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* name we can mount the root dataset.
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*/
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error = stat64(dataset, &statbuf);
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if (error == 0) {
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nvlist_t *config;
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char *name;
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int fd;
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fd = open(dataset, O_RDONLY);
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if (fd < 0)
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goto out;
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error = zpool_read_label(fd, &config);
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(void) close(fd);
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if (error)
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goto out;
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error = nvlist_lookup_string(config,
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ZPOOL_CONFIG_POOL_NAME, &name);
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if (error) {
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nvlist_free(config);
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} else {
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dataset = strdup(name);
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nvlist_free(config);
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return (dataset);
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}
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}
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out:
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/*
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* If a file or directory in your current working directory is
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* named 'dataset' then mount(8) will prepend your current working
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* directory to the dataset. There is no way to prevent this
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* behavior so we simply check for it and strip the prepended
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* patch when it is added.
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*/
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if (getcwd(cwd, PATH_MAX) == NULL)
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return (dataset);
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len = strlen(cwd);
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/* Do not add one when cwd already ends in a trailing '/' */
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if (!strncmp(cwd, dataset, len))
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return (dataset + len + (cwd[len-1] != '/'));
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return (dataset);
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}
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/*
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* Update the mtab_* code to use the libmount library when it is commonly
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* available otherwise fallback to legacy mode. The mount(8) utility will
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* manage the lock file for us to prevent racing updates to /etc/mtab.
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*/
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static int
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mtab_is_writeable(void)
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{
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struct stat st;
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int error, fd;
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error = lstat(MNTTAB, &st);
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if (error || S_ISLNK(st.st_mode))
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return (0);
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fd = open(MNTTAB, O_RDWR | O_CREAT, 0644);
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if (fd < 0)
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return (0);
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close(fd);
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return (1);
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}
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static int
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mtab_update(char *dataset, char *mntpoint, char *type, char *mntopts)
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{
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struct mntent mnt;
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FILE *fp;
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int error;
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mnt.mnt_fsname = dataset;
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mnt.mnt_dir = mntpoint;
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mnt.mnt_type = type;
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mnt.mnt_opts = mntopts ? mntopts : "";
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mnt.mnt_freq = 0;
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mnt.mnt_passno = 0;
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fp = setmntent(MNTTAB, "a+");
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if (!fp) {
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(void) fprintf(stderr, gettext(
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"filesystem '%s' was mounted, but %s "
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"could not be opened due to error %d\n"),
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dataset, MNTTAB, errno);
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return (MOUNT_FILEIO);
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}
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error = addmntent(fp, &mnt);
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if (error) {
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(void) fprintf(stderr, gettext(
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"filesystem '%s' was mounted, but %s "
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"could not be updated due to error %d\n"),
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dataset, MNTTAB, errno);
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return (MOUNT_FILEIO);
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}
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(void) endmntent(fp);
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return (MOUNT_SUCCESS);
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}
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int
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main(int argc, char **argv)
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{
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zfs_handle_t *zhp;
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char legacy[ZFS_MAXPROPLEN];
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char mntopts[MNT_LINE_MAX] = { '\0' };
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char badopt[MNT_LINE_MAX] = { '\0' };
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char mtabopt[MNT_LINE_MAX] = { '\0' };
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char mntpoint[PATH_MAX];
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char *dataset;
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unsigned long mntflags = 0, zfsflags = 0, remount = 0;
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int sloppy = 0, fake = 0, verbose = 0, nomtab = 0, zfsutil = 0;
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int error, c;
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(void) setlocale(LC_ALL, "");
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(void) textdomain(TEXT_DOMAIN);
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opterr = 0;
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/* check options */
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while ((c = getopt(argc, argv, "sfnvo:h?")) != -1) {
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switch (c) {
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case 's':
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sloppy = 1;
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break;
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case 'f':
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fake = 1;
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break;
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case 'n':
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nomtab = 1;
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break;
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case 'v':
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verbose++;
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break;
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case 'o':
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(void) strlcpy(mntopts, optarg, sizeof (mntopts));
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break;
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case 'h':
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case '?':
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(void) fprintf(stderr, gettext("Invalid option '%c'\n"),
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optopt);
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(void) fprintf(stderr, gettext("Usage: mount.zfs "
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"[-sfnv] [-o options] <dataset> <mountpoint>\n"));
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return (MOUNT_USAGE);
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}
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}
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argc -= optind;
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argv += optind;
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/* check that we only have two arguments */
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if (argc != 2) {
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if (argc == 0)
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(void) fprintf(stderr, gettext("missing dataset "
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"argument\n"));
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else if (argc == 1)
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(void) fprintf(stderr,
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gettext("missing mountpoint argument\n"));
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else
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(void) fprintf(stderr, gettext("too many arguments\n"));
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(void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n");
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return (MOUNT_USAGE);
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}
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dataset = parse_dataset(argv[0]);
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/* canonicalize the mount point */
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if (realpath(argv[1], mntpoint) == NULL) {
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(void) fprintf(stderr, gettext("filesystem '%s' cannot be "
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"mounted at '%s' due to canonicalization error %d.\n"),
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dataset, argv[1], errno);
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return (MOUNT_SYSERR);
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}
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/* validate mount options and set mntflags */
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error = parse_options(mntopts, &mntflags, &zfsflags, sloppy,
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badopt, mtabopt);
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if (error) {
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switch (error) {
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case ENOMEM:
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(void) fprintf(stderr, gettext("filesystem '%s' "
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"cannot be mounted due to a memory allocation "
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"failure.\n"), dataset);
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return (MOUNT_SYSERR);
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case ENOENT:
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(void) fprintf(stderr, gettext("filesystem '%s' "
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"cannot be mounted of due invalid option "
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"'%s'.\n"), dataset, badopt);
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(void) fprintf(stderr, gettext("Use the '-s' option "
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"to ignore the bad mount option.\n"));
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return (MOUNT_USAGE);
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default:
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(void) fprintf(stderr, gettext("filesystem '%s' "
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"cannot be mounted due to internal error %d.\n"),
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dataset, error);
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return (MOUNT_SOFTWARE);
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}
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}
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#ifdef HAVE_LIBSELINUX
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/*
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* Automatically add the default zfs context when selinux is enabled
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* and the caller has not specified their own context. This must be
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* done until zfs is added to the default selinux policy configuration
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* as a known filesystem type which supports xattrs.
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*/
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if (is_selinux_enabled() && !(zfsflags & ZS_NOCONTEXT)) {
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(void) strlcat(mntopts, ",context=\"system_u:"
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"object_r:file_t:s0\"", sizeof (mntopts));
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(void) strlcat(mtabopt, ",context=\"system_u:"
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"object_r:file_t:s0\"", sizeof (mtabopt));
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}
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#endif /* HAVE_LIBSELINUX */
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if (verbose)
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(void) fprintf(stdout, gettext("mount.zfs:\n"
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" dataset: \"%s\"\n mountpoint: \"%s\"\n"
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" mountflags: 0x%lx\n zfsflags: 0x%lx\n"
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" mountopts: \"%s\"\n mtabopts: \"%s\"\n"),
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dataset, mntpoint, mntflags, zfsflags, mntopts, mtabopt);
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if (mntflags & MS_REMOUNT) {
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nomtab = 1;
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remount = 1;
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}
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if (zfsflags & ZS_ZFSUTIL)
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zfsutil = 1;
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if ((g_zfs = libzfs_init()) == NULL)
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return (MOUNT_SYSERR);
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/* try to open the dataset to access the mount point */
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if ((zhp = zfs_open(g_zfs, dataset,
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ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT)) == NULL) {
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(void) fprintf(stderr, gettext("filesystem '%s' cannot be "
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"mounted, unable to open the dataset\n"), dataset);
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libzfs_fini(g_zfs);
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return (MOUNT_USAGE);
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}
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/* treat all snapshots as legacy mount points */
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if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT)
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(void) strlcpy(legacy, ZFS_MOUNTPOINT_LEGACY, ZFS_MAXPROPLEN);
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else
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(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, legacy,
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sizeof (legacy), NULL, NULL, 0, B_FALSE);
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zfs_close(zhp);
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libzfs_fini(g_zfs);
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/*
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* Legacy mount points may only be mounted using 'mount', never using
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* 'zfs mount'. However, since 'zfs mount' actually invokes 'mount'
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* we differentiate the two cases using the 'zfsutil' mount option.
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* This mount option should only be supplied by the 'zfs mount' util.
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*
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* The only exception to the above rule is '-o remount' which is
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* always allowed for non-legacy datasets. This is done because when
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* using zfs as your root file system both rc.sysinit/umountroot and
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* systemd depend on 'mount -o remount <mountpoint>' to work.
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*/
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if (zfsutil && !strcmp(legacy, ZFS_MOUNTPOINT_LEGACY)) {
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(void) fprintf(stderr, gettext(
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"filesystem '%s' cannot be mounted using 'zfs mount'.\n"
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"Use 'zfs set mountpoint=%s' or 'mount -t zfs %s %s'.\n"
|
|
"See zfs(8) for more information.\n"),
|
|
dataset, mntpoint, dataset, mntpoint);
|
|
return (MOUNT_USAGE);
|
|
}
|
|
|
|
if (!zfsutil && !(remount || fake) &&
|
|
strcmp(legacy, ZFS_MOUNTPOINT_LEGACY)) {
|
|
(void) fprintf(stderr, gettext(
|
|
"filesystem '%s' cannot be mounted using 'mount'.\n"
|
|
"Use 'zfs set mountpoint=%s' or 'zfs mount %s'.\n"
|
|
"See zfs(8) for more information.\n"),
|
|
dataset, "legacy", dataset);
|
|
return (MOUNT_USAGE);
|
|
}
|
|
|
|
if (!fake) {
|
|
error = mount(dataset, mntpoint, MNTTYPE_ZFS,
|
|
mntflags, mntopts);
|
|
if (error) {
|
|
switch (errno) {
|
|
case ENOENT:
|
|
(void) fprintf(stderr, gettext("mount point "
|
|
"'%s' does not exist\n"), mntpoint);
|
|
return (MOUNT_SYSERR);
|
|
case EBUSY:
|
|
(void) fprintf(stderr, gettext("filesystem "
|
|
"'%s' is already mounted\n"), dataset);
|
|
return (MOUNT_BUSY);
|
|
default:
|
|
(void) fprintf(stderr, gettext("filesystem "
|
|
"'%s' can not be mounted due to error "
|
|
"%d\n"), dataset, errno);
|
|
return (MOUNT_USAGE);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!nomtab && mtab_is_writeable()) {
|
|
error = mtab_update(dataset, mntpoint, MNTTYPE_ZFS, mtabopt);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
return (MOUNT_SUCCESS);
|
|
}
|