| /* |
| * 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; |
| |
| typedef struct option_map { |
| const char *name; |
| unsigned long mntmask; |
| unsigned long zfsmask; |
| } option_map_t; |
| |
| static const option_map_t option_map[] = { |
| /* Canonicalized filesystem independent options from mount(8) */ |
| { MNTOPT_NOAUTO, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_DEFAULTS, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_NODEVICES, MS_NODEV, ZS_COMMENT }, |
| { MNTOPT_DIRSYNC, MS_DIRSYNC, ZS_COMMENT }, |
| { MNTOPT_NOEXEC, MS_NOEXEC, ZS_COMMENT }, |
| { MNTOPT_GROUP, MS_GROUP, ZS_COMMENT }, |
| { MNTOPT_NETDEV, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_NOFAIL, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_NOSUID, MS_NOSUID, ZS_COMMENT }, |
| { MNTOPT_OWNER, MS_OWNER, ZS_COMMENT }, |
| { MNTOPT_REMOUNT, MS_REMOUNT, ZS_COMMENT }, |
| { MNTOPT_RO, MS_RDONLY, ZS_COMMENT }, |
| { MNTOPT_RW, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_SYNC, MS_SYNCHRONOUS, ZS_COMMENT }, |
| { MNTOPT_USER, MS_USERS, ZS_COMMENT }, |
| { MNTOPT_USERS, MS_USERS, ZS_COMMENT }, |
| /* acl flags passed with util-linux-2.24 mount command */ |
| { MNTOPT_ACL, MS_POSIXACL, ZS_COMMENT }, |
| { MNTOPT_NOACL, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_POSIXACL, MS_POSIXACL, ZS_COMMENT }, |
| #ifdef MS_NOATIME |
| { MNTOPT_NOATIME, MS_NOATIME, ZS_COMMENT }, |
| #endif |
| #ifdef MS_NODIRATIME |
| { MNTOPT_NODIRATIME, MS_NODIRATIME, ZS_COMMENT }, |
| #endif |
| #ifdef MS_RELATIME |
| { MNTOPT_RELATIME, MS_RELATIME, ZS_COMMENT }, |
| #endif |
| #ifdef MS_STRICTATIME |
| { MNTOPT_STRICTATIME, MS_STRICTATIME, ZS_COMMENT }, |
| #endif |
| #ifdef MS_LAZYTIME |
| { MNTOPT_LAZYTIME, MS_LAZYTIME, ZS_COMMENT }, |
| #endif |
| { MNTOPT_CONTEXT, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_FSCONTEXT, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_DEFCONTEXT, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_ROOTCONTEXT, MS_COMMENT, ZS_COMMENT }, |
| #ifdef MS_I_VERSION |
| { MNTOPT_IVERSION, MS_I_VERSION, ZS_COMMENT }, |
| #endif |
| #ifdef MS_MANDLOCK |
| { MNTOPT_NBMAND, MS_MANDLOCK, ZS_COMMENT }, |
| #endif |
| /* Valid options not found in mount(8) */ |
| { MNTOPT_BIND, MS_BIND, ZS_COMMENT }, |
| #ifdef MS_REC |
| { MNTOPT_RBIND, MS_BIND|MS_REC, ZS_COMMENT }, |
| #endif |
| { MNTOPT_COMMENT, MS_COMMENT, ZS_COMMENT }, |
| #ifdef MS_NOSUB |
| { MNTOPT_NOSUB, MS_NOSUB, ZS_COMMENT }, |
| #endif |
| #ifdef MS_SILENT |
| { MNTOPT_QUIET, MS_SILENT, ZS_COMMENT }, |
| #endif |
| /* Custom zfs options */ |
| { MNTOPT_XATTR, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_NOXATTR, MS_COMMENT, ZS_COMMENT }, |
| { MNTOPT_ZFSUTIL, MS_COMMENT, ZS_ZFSUTIL }, |
| { NULL, 0, 0 } }; |
| |
| /* |
| * Break the mount option in to a name/value pair. The name is |
| * validated against the option map and mount flags set accordingly. |
| */ |
| static int |
| parse_option(char *mntopt, unsigned long *mntflags, |
| unsigned long *zfsflags, int sloppy) |
| { |
| const option_map_t *opt; |
| char *ptr, *name, *value = NULL; |
| int error = 0; |
| |
| name = strdup(mntopt); |
| if (name == NULL) |
| return (ENOMEM); |
| |
| for (ptr = name; ptr && *ptr; ptr++) { |
| if (*ptr == '=') { |
| *ptr = '\0'; |
| value = ptr+1; |
| VERIFY3P(value, !=, NULL); |
| break; |
| } |
| } |
| |
| for (opt = option_map; opt->name != NULL; opt++) { |
| if (strncmp(name, opt->name, strlen(name)) == 0) { |
| *mntflags |= opt->mntmask; |
| *zfsflags |= opt->zfsmask; |
| error = 0; |
| goto out; |
| } |
| } |
| |
| if (!sloppy) |
| error = ENOENT; |
| out: |
| /* If required further process on the value may be done here */ |
| free(name); |
| return (error); |
| } |
| |
| /* |
| * Translate the mount option string in to MS_* mount flags for the |
| * kernel vfs. When sloppy is non-zero unknown options will be ignored |
| * otherwise they are considered fatal are copied in to badopt. |
| */ |
| static int |
| parse_options(char *mntopts, unsigned long *mntflags, unsigned long *zfsflags, |
| int sloppy, char *badopt, char *mtabopt) |
| { |
| int error = 0, quote = 0, flag = 0, count = 0; |
| char *ptr, *opt, *opts; |
| |
| opts = strdup(mntopts); |
| if (opts == NULL) |
| return (ENOMEM); |
| |
| *mntflags = 0; |
| opt = NULL; |
| |
| /* |
| * Scan through all mount options which must be comma delimited. |
| * We must be careful to notice regions which are double quoted |
| * and skip commas in these regions. Each option is then checked |
| * to determine if it is a known option. |
| */ |
| for (ptr = opts; ptr && !flag; ptr++) { |
| if (opt == NULL) |
| opt = ptr; |
| |
| if (*ptr == '"') |
| quote = !quote; |
| |
| if (quote) |
| continue; |
| |
| if (*ptr == '\0') |
| flag = 1; |
| |
| if ((*ptr == ',') || (*ptr == '\0')) { |
| *ptr = '\0'; |
| |
| error = parse_option(opt, mntflags, zfsflags, sloppy); |
| if (error) { |
| strcpy(badopt, opt); |
| goto out; |
| |
| } |
| |
| if (!(*mntflags & MS_REMOUNT) && |
| !(*zfsflags & ZS_ZFSUTIL)) { |
| if (count > 0) |
| strlcat(mtabopt, ",", MNT_LINE_MAX); |
| |
| strlcat(mtabopt, opt, MNT_LINE_MAX); |
| count++; |
| } |
| |
| opt = NULL; |
| } |
| } |
| |
| out: |
| free(opts); |
| return (error); |
| } |
| |
| /* |
| * Return the pool/dataset to mount given the name passed to mount. This |
| * is expected to be of the form pool/dataset, however may also refer to |
| * a block device if that device contains a valid zfs label. |
| */ |
| static char * |
| parse_dataset(char *dataset) |
| { |
| char cwd[PATH_MAX]; |
| struct stat64 statbuf; |
| int error; |
| int len; |
| |
| /* |
| * We expect a pool/dataset to be provided, however if we're |
| * given a device which is a member of a zpool we attempt to |
| * extract the pool name stored in the label. Given the pool |
| * name we can mount the root dataset. |
| */ |
| error = stat64(dataset, &statbuf); |
| if (error == 0) { |
| nvlist_t *config; |
| char *name; |
| int fd; |
| |
| fd = open(dataset, O_RDONLY); |
| if (fd < 0) |
| goto out; |
| |
| error = zpool_read_label(fd, &config, NULL); |
| (void) close(fd); |
| if (error) |
| goto out; |
| |
| error = nvlist_lookup_string(config, |
| ZPOOL_CONFIG_POOL_NAME, &name); |
| if (error) { |
| nvlist_free(config); |
| } else { |
| dataset = strdup(name); |
| nvlist_free(config); |
| return (dataset); |
| } |
| } |
| out: |
| /* |
| * If a file or directory in your current working directory is |
| * named 'dataset' then mount(8) will prepend your current working |
| * directory to the dataset. There is no way to prevent this |
| * behavior so we simply check for it and strip the prepended |
| * patch when it is added. |
| */ |
| if (getcwd(cwd, PATH_MAX) == NULL) |
| return (dataset); |
| |
| len = strlen(cwd); |
| |
| /* Do not add one when cwd already ends in a trailing '/' */ |
| if (strncmp(cwd, dataset, len) == 0) |
| return (dataset + len + (cwd[len-1] != '/')); |
| |
| return (dataset); |
| } |
| |
| /* |
| * 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 %d\n"), |
| dataset, 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 %d\n"), |
| dataset, errno); |
| return (MOUNT_FILEIO); |
| } |
| |
| (void) endmntent(fp); |
| |
| return (MOUNT_SUCCESS); |
| } |
| |
| static void |
| append_mntopt(const char *name, const char *val, char *mntopts, |
| char *mtabopt, boolean_t quote) |
| { |
| char tmp[MNT_LINE_MAX]; |
| |
| snprintf(tmp, MNT_LINE_MAX, quote ? ",%s=\"%s\"" : ",%s=%s", name, val); |
| |
| if (mntopts) |
| strlcat(mntopts, tmp, MNT_LINE_MAX); |
| |
| if (mtabopt) |
| strlcat(mtabopt, tmp, MNT_LINE_MAX); |
| } |
| |
| static void |
| zfs_selinux_setcontext(zfs_handle_t *zhp, zfs_prop_t zpt, const char *name, |
| char *mntopts, char *mtabopt) |
| { |
| char context[ZFS_MAXPROPLEN]; |
| |
| if (zfs_prop_get(zhp, zpt, context, sizeof (context), |
| NULL, NULL, 0, B_FALSE) == 0) { |
| if (strcmp(context, "none") != 0) |
| append_mntopt(name, context, mntopts, mtabopt, B_TRUE); |
| } |
| } |
| |
| 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; |
| 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) 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 '?': |
| (void) fprintf(stderr, gettext("Invalid option '%c'\n"), |
| optopt); |
| (void) fprintf(stderr, gettext("Usage: mount.zfs " |
| "[-sfnv] [-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); |
| } |
| |
| dataset = parse_dataset(argv[0]); |
| |
| /* 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 %d.\n"), |
| dataset, argv[1], errno); |
| return (MOUNT_SYSERR); |
| } |
| |
| /* validate mount options and set mntflags */ |
| error = parse_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 (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 (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); |
| } |
| |
| /* |
| * Checks to see if the ZFS_PROP_SELINUX_CONTEXT exists |
| * if it does, create a tmp variable in case it's needed |
| * checks to see if the selinux context is set to the default |
| * if it is, allow the setting of the other context properties |
| * this is needed because the 'context' property overrides others |
| * if it is not the default, set the 'context' property |
| */ |
| if (zfs_prop_get(zhp, ZFS_PROP_SELINUX_CONTEXT, prop, sizeof (prop), |
| NULL, NULL, 0, B_FALSE) == 0) { |
| if (strcmp(prop, "none") == 0) { |
| zfs_selinux_setcontext(zhp, ZFS_PROP_SELINUX_FSCONTEXT, |
| MNTOPT_FSCONTEXT, mntopts, mtabopt); |
| zfs_selinux_setcontext(zhp, ZFS_PROP_SELINUX_DEFCONTEXT, |
| MNTOPT_DEFCONTEXT, mntopts, mtabopt); |
| zfs_selinux_setcontext(zhp, |
| ZFS_PROP_SELINUX_ROOTCONTEXT, MNTOPT_ROOTCONTEXT, |
| mntopts, mtabopt); |
| } else { |
| append_mntopt(MNTOPT_CONTEXT, prop, |
| mntopts, mtabopt, B_TRUE); |
| } |
| } |
| |
| /* A hint used to determine an auto-mounted snapshot mount point */ |
| append_mntopt(MNTOPT_MNTPOINT, mntpoint, mntopts, NULL, B_FALSE); |
| |
| /* 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); |
| return (MOUNT_SYSERR); |
| } |
| |
| zfs_close(zhp); |
| libzfs_fini(g_zfs); |
| |
| /* |
| * 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); |
| 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); |
| 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); |
| 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); |
| } |
| /* fallthru */ |
| #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); |
| } |