396 lines
11 KiB
C
396 lines
11 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/mntent.h>
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#include <sys/stat.h>
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#include <libzfs.h>
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#include <libzutil.h>
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#include <locale.h>
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#include <getopt.h>
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#include <fcntl.h>
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#include <errno.h>
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#define ZS_COMMENT 0x00000000 /* comment */
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#define ZS_ZFSUTIL 0x00000001 /* caller is zfs(8) */
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libzfs_handle_t *g_zfs;
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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 void
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parse_dataset(const char *target, char **dataset)
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{
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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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int fd = open(target, O_RDONLY);
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if (fd >= 0) {
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nvlist_t *config = NULL;
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if (zpool_read_label(fd, &config, NULL) != 0)
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config = NULL;
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if (close(fd))
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perror("close");
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if (config) {
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char *name = NULL;
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if (!nvlist_lookup_string(config,
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ZPOOL_CONFIG_POOL_NAME, &name))
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(void) strlcpy(*dataset, name, PATH_MAX);
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nvlist_free(config);
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if (name)
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return;
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}
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}
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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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char cwd[PATH_MAX];
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if (getcwd(cwd, PATH_MAX) != NULL) {
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int 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, target, len) == 0)
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target += len + (cwd[len-1] != '/');
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}
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strlcpy(*dataset, target, PATH_MAX);
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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("/etc/mtab", &st);
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if (error || S_ISLNK(st.st_mode))
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return (0);
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fd = open("/etc/mtab", 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("/etc/mtab", "a+");
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if (!fp) {
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(void) fprintf(stderr, gettext(
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"filesystem '%s' was mounted, but /etc/mtab "
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"could not be opened due to error %d\n"),
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dataset, 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 /etc/mtab "
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"could not be updated due to error %d\n"),
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dataset, 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 prop[ZFS_MAXPROPLEN];
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uint64_t zfs_version = 0;
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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[PATH_MAX], *pdataset = 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) setlocale(LC_NUMERIC, "C");
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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_long(argc, argv, "sfnvo:h?", 0, 0)) != -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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parse_dataset(argv[0], &pdataset);
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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 = zfs_parse_mount_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 due to 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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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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(void) fprintf(stderr, "%s\n", libzfs_error_init(errno));
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return (MOUNT_SYSERR);
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}
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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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zfs_adjust_mount_options(zhp, mntpoint, mntopts, mtabopt);
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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(prop, ZFS_MOUNTPOINT_LEGACY, ZFS_MAXPROPLEN);
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else
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(void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, prop,
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sizeof (prop), NULL, NULL, 0, B_FALSE);
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/*
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* Fetch the max supported zfs version in case we get ENOTSUP
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* back from the mount command, since we need the zfs handle
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* to do so.
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*/
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zfs_version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION);
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if (zfs_version == 0) {
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fprintf(stderr, gettext("unable to fetch "
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"ZFS version for filesystem '%s'\n"), dataset);
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return (MOUNT_SYSERR);
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}
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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(prop, ZFS_MOUNTPOINT_LEGACY) == 0)) {
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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"
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"See zfs(8) for more information.\n"),
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dataset, mntpoint, dataset, mntpoint);
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return (MOUNT_USAGE);
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}
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if (!zfsutil && !(remount || fake) &&
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strcmp(prop, ZFS_MOUNTPOINT_LEGACY)) {
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(void) fprintf(stderr, gettext(
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"filesystem '%s' cannot be mounted using 'mount'.\n"
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"Use 'zfs set mountpoint=%s' or 'zfs mount %s'.\n"
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"See zfs(8) for more information.\n"),
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dataset, "legacy", dataset);
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return (MOUNT_USAGE);
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}
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if (!fake) {
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error = mount(dataset, mntpoint, MNTTYPE_ZFS,
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mntflags, mntopts);
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}
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if (error) {
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switch (errno) {
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case ENOENT:
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(void) fprintf(stderr, gettext("mount point "
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"'%s' does not exist\n"), mntpoint);
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return (MOUNT_SYSERR);
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case EBUSY:
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(void) fprintf(stderr, gettext("filesystem "
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"'%s' is already mounted\n"), dataset);
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return (MOUNT_BUSY);
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case ENOTSUP:
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if (zfs_version > ZPL_VERSION) {
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(void) fprintf(stderr,
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gettext("filesystem '%s' (v%d) is not "
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"supported by this implementation of "
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"ZFS (max v%d).\n"), dataset,
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(int)zfs_version, (int)ZPL_VERSION);
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} else {
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(void) fprintf(stderr,
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gettext("filesystem '%s' mount "
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"failed for unknown reason.\n"), dataset);
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}
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return (MOUNT_SYSERR);
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#ifdef MS_MANDLOCK
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case EPERM:
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if (mntflags & MS_MANDLOCK) {
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(void) fprintf(stderr, gettext("filesystem "
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"'%s' has the 'nbmand=on' property set, "
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"this mount\noption may be disabled in "
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"your kernel. Use 'zfs set nbmand=off'\n"
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"to disable this option and try to "
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"mount the filesystem again.\n"), dataset);
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return (MOUNT_SYSERR);
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}
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/* fallthru */
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#endif
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default:
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(void) fprintf(stderr, gettext("filesystem "
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"'%s' can not be mounted: %s\n"), dataset,
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strerror(errno));
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return (MOUNT_USAGE);
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}
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}
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if (!nomtab && mtab_is_writeable()) {
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error = mtab_update(dataset, mntpoint, MNTTYPE_ZFS, mtabopt);
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if (error)
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return (error);
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}
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return (MOUNT_SUCCESS);
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}
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