diff options
Diffstat (limited to 'lib/libzfs/os/linux/libzfs_mount_os.c')
| -rw-r--r-- | lib/libzfs/os/linux/libzfs_mount_os.c | 431 |
1 files changed, 0 insertions, 431 deletions
diff --git a/lib/libzfs/os/linux/libzfs_mount_os.c b/lib/libzfs/os/linux/libzfs_mount_os.c deleted file mode 100644 index 585d22d9e5b3..000000000000 --- a/lib/libzfs/os/linux/libzfs_mount_os.c +++ /dev/null @@ -1,431 +0,0 @@ -// SPDX-License-Identifier: CDDL-1.0 -/* - * 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 https://opensource.org/licenses/CDDL-1.0. - * 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 2015 Nexenta Systems, Inc. All rights reserved. - * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2014, 2021 by Delphix. All rights reserved. - * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com> - * Copyright 2017 RackTop Systems. - * Copyright (c) 2018 Datto Inc. - * Copyright 2018 OmniOS Community Edition (OmniOSce) Association. - */ - -#include <dirent.h> -#include <dlfcn.h> -#include <errno.h> -#include <fcntl.h> -#include <libgen.h> -#include <libintl.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <zone.h> -#include <sys/mntent.h> -#include <sys/mount.h> -#include <sys/stat.h> -#include <sys/vfs.h> -#include <sys/dsl_crypt.h> -#include <libzfs.h> - -#include "../../libzfs_impl.h" -#include <thread_pool.h> - -#define ZS_COMMENT 0x00000000 /* comment */ -#define ZS_ZFSUTIL 0x00000001 /* caller is zfs(8) */ - -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_DEVICES, MS_COMMENT, ZS_COMMENT }, - { MNTOPT_DIRSYNC, MS_DIRSYNC, ZS_COMMENT }, - { MNTOPT_NOEXEC, MS_NOEXEC, ZS_COMMENT }, - { MNTOPT_EXEC, MS_COMMENT, 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_SUID, MS_COMMENT, 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 }, - /* - * Case sensitive options are just listed here to silently - * ignore the error if passed with zfs mount command. - */ - { MNTOPT_CASESENSITIVE, MS_COMMENT, ZS_COMMENT }, - { MNTOPT_CASEINSENSITIVE, MS_COMMENT, ZS_COMMENT }, - { MNTOPT_CASEMIXED, MS_COMMENT, ZS_COMMENT }, -#ifdef MS_NOATIME - { MNTOPT_NOATIME, MS_NOATIME, ZS_COMMENT }, - { MNTOPT_ATIME, MS_COMMENT, ZS_COMMENT }, -#endif -#ifdef MS_NODIRATIME - { MNTOPT_NODIRATIME, MS_NODIRATIME, ZS_COMMENT }, - { MNTOPT_DIRATIME, MS_COMMENT, ZS_COMMENT }, -#endif -#ifdef MS_RELATIME - { MNTOPT_RELATIME, MS_RELATIME, ZS_COMMENT }, - { MNTOPT_NORELATIME, MS_COMMENT, ZS_COMMENT }, -#endif -#ifdef MS_STRICTATIME - { MNTOPT_STRICTATIME, MS_STRICTATIME, ZS_COMMENT }, - { MNTOPT_NOSTRICTATIME, MS_COMMENT, 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 }, - { MNTOPT_NONBMAND, MS_COMMENT, 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. - */ -int -zfs_parse_mount_options(const 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) && - mtabopt != NULL) { - if (count > 0) - strlcat(mtabopt, ",", MNT_LINE_MAX); - - strlcat(mtabopt, opt, MNT_LINE_MAX); - count++; - } - - opt = NULL; - } - } - -out: - free(opts); - return (error); -} - -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); - } -} - -void -zfs_adjust_mount_options(zfs_handle_t *zhp, const char *mntpoint, - char *mntopts, char *mtabopt) -{ - char prop[ZFS_MAXPROPLEN]; - - /* - * 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); -} - -/* - * By default the filesystem by preparing the mount options (i.e. parsing - * some flags from the "opts" parameter into the "flags" parameter) and then - * directly calling the system call mount(2). We don't need the mount utility - * or update /etc/mtab, because this is a symlink on all modern systems. - * - * If the environment variable ZFS_MOUNT_HELPER is set, we fall back to the - * previous behavior: - * The filesystem is mounted by invoking the system mount utility rather - * than by the system call mount(2). This ensures that the /etc/mtab - * file is correctly locked for the update. Performing our own locking - * and /etc/mtab update requires making an unsafe assumption about how - * the mount utility performs its locking. Unfortunately, this also means - * in the case of a mount failure we do not have the exact errno. We must - * make due with return value from the mount process. - */ -int -do_mount(zfs_handle_t *zhp, const char *mntpt, const char *opts, int flags) -{ - const char *src = zfs_get_name(zhp); - int error = 0; - - if (!libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) { - char badopt[MNT_LINE_MAX] = {0}; - unsigned long mntflags = flags, zfsflags = 0; - char myopts[MNT_LINE_MAX] = {0}; - - if (zfs_parse_mount_options(opts, &mntflags, - &zfsflags, 0, badopt, NULL)) { - return (EINVAL); - } - strlcat(myopts, opts, MNT_LINE_MAX); - zfs_adjust_mount_options(zhp, mntpt, myopts, NULL); - if (mount(src, mntpt, MNTTYPE_ZFS, mntflags, myopts)) { - return (errno); - } - } else { - char *argv[9] = { - (char *)"/bin/mount", - (char *)"--no-canonicalize", - (char *)"-t", (char *)MNTTYPE_ZFS, - (char *)"-o", (char *)opts, - (char *)src, - (char *)mntpt, - (char *)NULL }; - - /* Return only the most critical mount error */ - error = libzfs_run_process(argv[0], argv, - STDOUT_VERBOSE|STDERR_VERBOSE); - if (error) { - if (error & MOUNT_FILEIO) { - error = EIO; - } else if (error & MOUNT_USER) { - error = EINTR; - } else if (error & MOUNT_SOFTWARE) { - error = EPIPE; - } else if (error & MOUNT_BUSY) { - error = EBUSY; - } else if (error & MOUNT_SYSERR) { - error = EAGAIN; - } else if (error & MOUNT_USAGE) { - error = EINVAL; - } else - error = ENXIO; /* Generic error */ - } - } - - return (error); -} - -int -do_unmount(zfs_handle_t *zhp, const char *mntpt, int flags) -{ - (void) zhp; - - if (!libzfs_envvar_is_set("ZFS_MOUNT_HELPER")) { - int rv = umount2(mntpt, flags); - - return (rv < 0 ? errno : 0); - } - - char *argv[7] = { - (char *)"/bin/umount", - (char *)"-t", (char *)MNTTYPE_ZFS, - NULL, NULL, NULL, NULL }; - int rc, count = 3; - - if (flags & MS_FORCE) - argv[count++] = (char *)"-f"; - - if (flags & MS_DETACH) - argv[count++] = (char *)"-l"; - - argv[count] = (char *)mntpt; - rc = libzfs_run_process(argv[0], argv, STDOUT_VERBOSE|STDERR_VERBOSE); - - return (rc ? EINVAL : 0); -} - -int -zfs_mount_delegation_check(void) -{ - return ((geteuid() != 0) ? EACCES : 0); -} - -/* Called from the tail end of zpool_disable_datasets() */ -void -zpool_disable_datasets_os(zpool_handle_t *zhp, boolean_t force) -{ - (void) zhp, (void) force; -} - -/* Called from the tail end of zfs_unmount() */ -void -zpool_disable_volume_os(const char *name) -{ - (void) name; -} |