| /* |
| * CDDL HEADER START |
| * |
| * The contents of this file are subject to the terms of the |
| * Common Development and Distribution License (the "License"). |
| * You may not use this file except in compliance with the License. |
| * |
| * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
| * or http://www.opensolaris.org/os/licensing. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * |
| * When distributing Covered Code, include this CDDL HEADER in each |
| * file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
| * If applicable, add the following below this CDDL HEADER, with the |
| * fields enclosed by brackets "[]" replaced with your own identifying |
| * information: Portions Copyright [yyyy] [name of copyright owner] |
| * |
| * CDDL HEADER END |
| */ |
| |
| /* |
| * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2011 Lawrence Livermore National Security, LLC. |
| */ |
| |
| #include <libintl.h> |
| #include <unistd.h> |
| #include <sys/file.h> |
| #include <sys/mount.h> |
| #include <sys/mntent.h> |
| #include <sys/stat.h> |
| #include <libzfs.h> |
| #include <libzutil.h> |
| #include <locale.h> |
| #include <getopt.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| |
| #define ZS_COMMENT 0x00000000 /* comment */ |
| #define ZS_ZFSUTIL 0x00000001 /* caller is zfs(8) */ |
| |
| libzfs_handle_t *g_zfs; |
| |
| /* |
| * Opportunistically convert a target string into a pool name. If the |
| * string does not represent a block device with a valid zfs label |
| * then it is passed through without modification. |
| */ |
| static void |
| parse_dataset(const char *target, char **dataset) |
| { |
| /* |
| * Prior to util-linux 2.36.2, if a file or directory in the |
| * current working directory was named 'dataset' then mount(8) |
| * would prepend the current working directory to the dataset. |
| * Check for it and strip the prepended path when it is added. |
| */ |
| char cwd[PATH_MAX]; |
| if (getcwd(cwd, PATH_MAX) == NULL) { |
| perror("getcwd"); |
| return; |
| } |
| int len = strlen(cwd); |
| if (strncmp(cwd, target, len) == 0) |
| target += len; |
| |
| /* Assume pool/dataset is more likely */ |
| strlcpy(*dataset, target, PATH_MAX); |
| |
| int fd = open(target, O_RDONLY | O_CLOEXEC); |
| if (fd < 0) |
| return; |
| |
| nvlist_t *cfg = NULL; |
| if (zpool_read_label(fd, &cfg, NULL) == 0) { |
| char *nm = NULL; |
| if (!nvlist_lookup_string(cfg, ZPOOL_CONFIG_POOL_NAME, &nm)) |
| strlcpy(*dataset, nm, PATH_MAX); |
| nvlist_free(cfg); |
| } |
| |
| if (close(fd)) |
| perror("close"); |
| } |
| |
| /* |
| * Update the mtab_* code to use the libmount library when it is commonly |
| * available otherwise fallback to legacy mode. The mount(8) utility will |
| * manage the lock file for us to prevent racing updates to /etc/mtab. |
| */ |
| static int |
| mtab_is_writeable(void) |
| { |
| struct stat st; |
| int error, fd; |
| |
| error = lstat("/etc/mtab", &st); |
| if (error || S_ISLNK(st.st_mode)) |
| return (0); |
| |
| fd = open("/etc/mtab", O_RDWR | O_CREAT, 0644); |
| if (fd < 0) |
| return (0); |
| |
| close(fd); |
| return (1); |
| } |
| |
| static int |
| mtab_update(char *dataset, char *mntpoint, char *type, char *mntopts) |
| { |
| struct mntent mnt; |
| FILE *fp; |
| int error; |
| |
| mnt.mnt_fsname = dataset; |
| mnt.mnt_dir = mntpoint; |
| mnt.mnt_type = type; |
| mnt.mnt_opts = mntopts ? mntopts : ""; |
| mnt.mnt_freq = 0; |
| mnt.mnt_passno = 0; |
| |
| fp = setmntent("/etc/mtab", "a+"); |
| if (!fp) { |
| (void) fprintf(stderr, gettext( |
| "filesystem '%s' was mounted, but /etc/mtab " |
| "could not be opened due to error: %s\n"), |
| dataset, strerror(errno)); |
| return (MOUNT_FILEIO); |
| } |
| |
| error = addmntent(fp, &mnt); |
| if (error) { |
| (void) fprintf(stderr, gettext( |
| "filesystem '%s' was mounted, but /etc/mtab " |
| "could not be updated due to error: %s\n"), |
| dataset, strerror(errno)); |
| return (MOUNT_FILEIO); |
| } |
| |
| (void) endmntent(fp); |
| |
| return (MOUNT_SUCCESS); |
| } |
| |
| int |
| main(int argc, char **argv) |
| { |
| zfs_handle_t *zhp; |
| char prop[ZFS_MAXPROPLEN]; |
| uint64_t zfs_version = 0; |
| char mntopts[MNT_LINE_MAX] = { '\0' }; |
| char badopt[MNT_LINE_MAX] = { '\0' }; |
| char mtabopt[MNT_LINE_MAX] = { '\0' }; |
| char mntpoint[PATH_MAX]; |
| char dataset[PATH_MAX], *pdataset = dataset; |
| unsigned long mntflags = 0, zfsflags = 0, remount = 0; |
| int sloppy = 0, fake = 0, verbose = 0, nomtab = 0, zfsutil = 0; |
| int error, c; |
| |
| (void) setlocale(LC_ALL, ""); |
| (void) setlocale(LC_NUMERIC, "C"); |
| (void) textdomain(TEXT_DOMAIN); |
| |
| opterr = 0; |
| |
| /* check options */ |
| while ((c = getopt_long(argc, argv, "sfnvo:h?", 0, 0)) != -1) { |
| switch (c) { |
| case 's': |
| sloppy = 1; |
| break; |
| case 'f': |
| fake = 1; |
| break; |
| case 'n': |
| nomtab = 1; |
| break; |
| case 'v': |
| verbose++; |
| break; |
| case 'o': |
| (void) strlcpy(mntopts, optarg, sizeof (mntopts)); |
| break; |
| case 'h': |
| case '?': |
| if (optopt) |
| (void) fprintf(stderr, |
| gettext("Invalid option '%c'\n"), optopt); |
| (void) fprintf(stderr, gettext("Usage: mount.zfs " |
| "[-sfnvh] [-o options] <dataset> <mountpoint>\n")); |
| return (MOUNT_USAGE); |
| } |
| } |
| |
| argc -= optind; |
| argv += optind; |
| |
| /* check that we only have two arguments */ |
| if (argc != 2) { |
| if (argc == 0) |
| (void) fprintf(stderr, gettext("missing dataset " |
| "argument\n")); |
| else if (argc == 1) |
| (void) fprintf(stderr, |
| gettext("missing mountpoint argument\n")); |
| else |
| (void) fprintf(stderr, gettext("too many arguments\n")); |
| (void) fprintf(stderr, "usage: mount <dataset> <mountpoint>\n"); |
| return (MOUNT_USAGE); |
| } |
| |
| parse_dataset(argv[0], &pdataset); |
| |
| /* canonicalize the mount point */ |
| if (realpath(argv[1], mntpoint) == NULL) { |
| (void) fprintf(stderr, gettext("filesystem '%s' cannot be " |
| "mounted at '%s' due to canonicalization error: %s\n"), |
| dataset, argv[1], strerror(errno)); |
| return (MOUNT_SYSERR); |
| } |
| |
| /* validate mount options and set mntflags */ |
| error = zfs_parse_mount_options(mntopts, &mntflags, &zfsflags, sloppy, |
| badopt, mtabopt); |
| if (error) { |
| switch (error) { |
| case ENOMEM: |
| (void) fprintf(stderr, gettext("filesystem '%s' " |
| "cannot be mounted due to a memory allocation " |
| "failure.\n"), dataset); |
| return (MOUNT_SYSERR); |
| case ENOENT: |
| (void) fprintf(stderr, gettext("filesystem '%s' " |
| "cannot be mounted due to invalid option " |
| "'%s'.\n"), dataset, badopt); |
| (void) fprintf(stderr, gettext("Use the '-s' option " |
| "to ignore the bad mount option.\n")); |
| return (MOUNT_USAGE); |
| default: |
| (void) fprintf(stderr, gettext("filesystem '%s' " |
| "cannot be mounted due to internal error %d.\n"), |
| dataset, error); |
| return (MOUNT_SOFTWARE); |
| } |
| } |
| |
| if (mntflags & MS_REMOUNT) { |
| nomtab = 1; |
| remount = 1; |
| } |
| |
| if (zfsflags & ZS_ZFSUTIL) |
| zfsutil = 1; |
| |
| if ((g_zfs = libzfs_init()) == NULL) { |
| (void) fprintf(stderr, "%s\n", libzfs_error_init(errno)); |
| return (MOUNT_SYSERR); |
| } |
| |
| /* try to open the dataset to access the mount point */ |
| if ((zhp = zfs_open(g_zfs, dataset, |
| ZFS_TYPE_FILESYSTEM | ZFS_TYPE_SNAPSHOT)) == NULL) { |
| (void) fprintf(stderr, gettext("filesystem '%s' cannot be " |
| "mounted, unable to open the dataset\n"), dataset); |
| libzfs_fini(g_zfs); |
| return (MOUNT_USAGE); |
| } |
| |
| if (!zfsutil || sloppy || |
| libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) { |
| zfs_adjust_mount_options(zhp, mntpoint, mntopts, mtabopt); |
| } |
| |
| /* treat all snapshots as legacy mount points */ |
| if (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT) |
| (void) strlcpy(prop, ZFS_MOUNTPOINT_LEGACY, ZFS_MAXPROPLEN); |
| else |
| (void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, prop, |
| sizeof (prop), NULL, NULL, 0, B_FALSE); |
| |
| /* |
| * Fetch the max supported zfs version in case we get ENOTSUP |
| * back from the mount command, since we need the zfs handle |
| * to do so. |
| */ |
| zfs_version = zfs_prop_get_int(zhp, ZFS_PROP_VERSION); |
| if (zfs_version == 0) { |
| fprintf(stderr, gettext("unable to fetch " |
| "ZFS version for filesystem '%s'\n"), dataset); |
| zfs_close(zhp); |
| libzfs_fini(g_zfs); |
| return (MOUNT_SYSERR); |
| } |
| |
| /* |
| * Legacy mount points may only be mounted using 'mount', never using |
| * 'zfs mount'. However, since 'zfs mount' actually invokes 'mount' |
| * we differentiate the two cases using the 'zfsutil' mount option. |
| * This mount option should only be supplied by the 'zfs mount' util. |
| * |
| * The only exception to the above rule is '-o remount' which is |
| * always allowed for non-legacy datasets. This is done because when |
| * using zfs as your root file system both rc.sysinit/umountroot and |
| * systemd depend on 'mount -o remount <mountpoint>' to work. |
| */ |
| if (zfsutil && (strcmp(prop, ZFS_MOUNTPOINT_LEGACY) == 0)) { |
| (void) fprintf(stderr, gettext( |
| "filesystem '%s' cannot be mounted using 'zfs mount'.\n" |
| "Use 'zfs set mountpoint=%s' or 'mount -t zfs %s %s'.\n" |
| "See zfs(8) for more information.\n"), |
| dataset, mntpoint, dataset, mntpoint); |
| zfs_close(zhp); |
| libzfs_fini(g_zfs); |
| return (MOUNT_USAGE); |
| } |
| |
| if (!zfsutil && !(remount || fake) && |
| strcmp(prop, 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); |
| zfs_close(zhp); |
| libzfs_fini(g_zfs); |
| return (MOUNT_USAGE); |
| } |
| |
| if (verbose) |
| (void) fprintf(stdout, gettext("mount.zfs:\n" |
| " dataset: \"%s\"\n mountpoint: \"%s\"\n" |
| " mountflags: 0x%lx\n zfsflags: 0x%lx\n" |
| " mountopts: \"%s\"\n mtabopts: \"%s\"\n"), |
| dataset, mntpoint, mntflags, zfsflags, mntopts, mtabopt); |
| |
| if (!fake) { |
| if (zfsutil && !sloppy && |
| !libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) { |
| error = zfs_mount_at(zhp, mntopts, mntflags, mntpoint); |
| if (error) { |
| (void) fprintf(stderr, "zfs_mount_at() failed: " |
| "%s", libzfs_error_description(g_zfs)); |
| zfs_close(zhp); |
| libzfs_fini(g_zfs); |
| return (MOUNT_SYSERR); |
| } |
| } else { |
| error = mount(dataset, mntpoint, MNTTYPE_ZFS, |
| mntflags, mntopts); |
| } |
| } |
| |
| zfs_close(zhp); |
| libzfs_fini(g_zfs); |
| |
| 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); |
| case ENOTSUP: |
| if (zfs_version > ZPL_VERSION) { |
| (void) fprintf(stderr, |
| gettext("filesystem '%s' (v%d) is not " |
| "supported by this implementation of " |
| "ZFS (max v%d).\n"), dataset, |
| (int)zfs_version, (int)ZPL_VERSION); |
| } else { |
| (void) fprintf(stderr, |
| gettext("filesystem '%s' mount " |
| "failed for unknown reason.\n"), dataset); |
| } |
| return (MOUNT_SYSERR); |
| #ifdef MS_MANDLOCK |
| case EPERM: |
| if (mntflags & MS_MANDLOCK) { |
| (void) fprintf(stderr, gettext("filesystem " |
| "'%s' has the 'nbmand=on' property set, " |
| "this mount\noption may be disabled in " |
| "your kernel. Use 'zfs set nbmand=off'\n" |
| "to disable this option and try to " |
| "mount the filesystem again.\n"), dataset); |
| return (MOUNT_SYSERR); |
| } |
| fallthrough; |
| #endif |
| default: |
| (void) fprintf(stderr, gettext("filesystem " |
| "'%s' can not be mounted: %s\n"), dataset, |
| strerror(errno)); |
| return (MOUNT_USAGE); |
| } |
| } |
| |
| if (!nomtab && mtab_is_writeable()) { |
| error = mtab_update(dataset, mntpoint, MNTTYPE_ZFS, mtabopt); |
| if (error) |
| return (error); |
| } |
| |
| return (MOUNT_SUCCESS); |
| } |