From d53368f6755ff67342f68e2e536c4157409fd047 Mon Sep 17 00:00:00 2001 From: Brian Behlendorf Date: Fri, 4 Mar 2011 15:14:46 -0800 Subject: Fix mount helper Several issues related to strange mount/umount behavior were reported and this commit should address most of them. The original idea was to put in place a zfs mount helper (mount.zfs). This helper is used to enforce 'legacy' mount behavior, and perform any extra mount argument processing (selinux, zfsutil, etc). This helper wasn't ready for the 0.6.0-rc1 release but with this change it's functional but needs to extensively tested. This change addresses the following open issues. Closes #101 Closes #107 Closes #113 Closes #115 Closes #119 --- cmd/mount_zfs/Makefile.am | 28 ++ cmd/mount_zfs/Makefile.in | 664 ++++++++++++++++++++++++++++++++++++++++++++++ cmd/mount_zfs/mount_zfs.c | 470 ++++++++++++++++++++++++++++++++ 3 files changed, 1162 insertions(+) create mode 100644 cmd/mount_zfs/Makefile.am create mode 100644 cmd/mount_zfs/Makefile.in create mode 100644 cmd/mount_zfs/mount_zfs.c (limited to 'cmd/mount_zfs') diff --git a/cmd/mount_zfs/Makefile.am b/cmd/mount_zfs/Makefile.am new file mode 100644 index 000000000..f5d2db0ba --- /dev/null +++ b/cmd/mount_zfs/Makefile.am @@ -0,0 +1,28 @@ +include $(top_srcdir)/config/Rules.am + +DEFAULT_INCLUDES += \ + -I$(top_srcdir)/include \ + -I$(top_srcdir)/lib/libspl/include + +# +# Ignore the prefix for the mount helper. It must be installed in /sbin/ +# because this path is hardcoded in the mount(8) for security reasons. +# +sbindir=/sbin +sbin_PROGRAMS = mount.zfs + +mount_zfs_SOURCES = \ + $(top_srcdir)/cmd/mount_zfs/mount_zfs.c + +mount_zfs_LDADD = \ + $(top_builddir)/lib/libspl/libspl.la \ + $(top_builddir)/lib/libavl/libavl.la \ + $(top_builddir)/lib/libefi/libefi.la \ + $(top_builddir)/lib/libnvpair/libnvpair.la \ + $(top_builddir)/lib/libunicode/libunicode.la \ + $(top_builddir)/lib/libuutil/libuutil.la \ + $(top_builddir)/lib/libzpool/libzpool.la \ + $(top_builddir)/lib/libzfs/libzfs.la + +mount_zfs_LDFLAGS = \ + -pthread -lm $(ZLIB) -lrt -ldl $(LIBUUID) $(LIBBLKID) diff --git a/cmd/mount_zfs/Makefile.in b/cmd/mount_zfs/Makefile.in new file mode 100644 index 000000000..18d3c6e22 --- /dev/null +++ b/cmd/mount_zfs/Makefile.in @@ -0,0 +1,664 @@ +# Makefile.in generated by automake 1.11.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, +# Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkglibexecdir = $(libexecdir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +target_triplet = @target@ +DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in \ + $(top_srcdir)/config/Rules.am +sbin_PROGRAMS = mount.zfs$(EXEEXT) +subdir = cmd/mount_zfs +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = \ + $(top_srcdir)/config/kernel-bdev-block-device-operations.m4 \ + $(top_srcdir)/config/kernel-bdev-logical-size.m4 \ + $(top_srcdir)/config/kernel-bio-empty-barrier.m4 \ + $(top_srcdir)/config/kernel-bio-end-io-t-args.m4 \ + $(top_srcdir)/config/kernel-bio-failfast.m4 \ + $(top_srcdir)/config/kernel-bio-rw-syncio.m4 \ + $(top_srcdir)/config/kernel-blk-end-request.m4 \ + $(top_srcdir)/config/kernel-blk-fetch-request.m4 \ + $(top_srcdir)/config/kernel-blk-requeue-request.m4 \ + $(top_srcdir)/config/kernel-blk-rq-bytes.m4 \ + $(top_srcdir)/config/kernel-blk-rq-pos.m4 \ + $(top_srcdir)/config/kernel-blk-rq-sectors.m4 \ + $(top_srcdir)/config/kernel-blkdev-get-by-path.m4 \ + $(top_srcdir)/config/kernel-evict-inode.m4 \ + $(top_srcdir)/config/kernel-fmode-t.m4 \ + $(top_srcdir)/config/kernel-fsync.m4 \ + $(top_srcdir)/config/kernel-get-disk-ro.m4 \ + $(top_srcdir)/config/kernel-invalidate-bdev-args.m4 \ + $(top_srcdir)/config/kernel-kobj-name-len.m4 \ + $(top_srcdir)/config/kernel-open-bdev-exclusive.m4 \ + $(top_srcdir)/config/kernel-rq-for-each_segment.m4 \ + $(top_srcdir)/config/kernel-rq-is_sync.m4 \ + $(top_srcdir)/config/kernel-xattr-handler.m4 \ + $(top_srcdir)/config/kernel.m4 \ + $(top_srcdir)/config/user-arch.m4 \ + $(top_srcdir)/config/user-frame-larger-than.m4 \ + $(top_srcdir)/config/user-ioctl.m4 \ + $(top_srcdir)/config/user-libblkid.m4 \ + $(top_srcdir)/config/user-libuuid.m4 \ + $(top_srcdir)/config/user-nptl_guard_within_stack.m4 \ + $(top_srcdir)/config/user-selinux.m4 \ + $(top_srcdir)/config/user-zlib.m4 $(top_srcdir)/config/user.m4 \ + $(top_srcdir)/config/zfs-build.m4 \ + $(top_srcdir)/config/zfs-meta.m4 $(top_srcdir)/configure.ac +am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \ + $(ACLOCAL_M4) +mkinstalldirs = $(install_sh) -d +CONFIG_HEADER = $(top_builddir)/zfs_config.h +CONFIG_CLEAN_FILES = +CONFIG_CLEAN_VPATH_FILES = +am__installdirs = "$(DESTDIR)$(sbindir)" +PROGRAMS = $(sbin_PROGRAMS) +am_mount_zfs_OBJECTS = mount_zfs.$(OBJEXT) +mount_zfs_OBJECTS = $(am_mount_zfs_OBJECTS) +mount_zfs_DEPENDENCIES = $(top_builddir)/lib/libspl/libspl.la \ + $(top_builddir)/lib/libavl/libavl.la \ + $(top_builddir)/lib/libefi/libefi.la \ + $(top_builddir)/lib/libnvpair/libnvpair.la \ + $(top_builddir)/lib/libunicode/libunicode.la \ + $(top_builddir)/lib/libuutil/libuutil.la \ + $(top_builddir)/lib/libzpool/libzpool.la \ + $(top_builddir)/lib/libzfs/libzfs.la +AM_V_lt = $(am__v_lt_$(V)) +am__v_lt_ = $(am__v_lt_$(AM_DEFAULT_VERBOSITY)) +am__v_lt_0 = --silent +mount_zfs_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \ + $(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \ + $(mount_zfs_LDFLAGS) $(LDFLAGS) -o $@ +depcomp = $(SHELL) $(top_srcdir)/config/depcomp +am__depfiles_maybe = depfiles +am__mv = mv -f +COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \ + $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) +LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \ + $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \ + $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \ + $(AM_CFLAGS) $(CFLAGS) +AM_V_CC = $(am__v_CC_$(V)) +am__v_CC_ = $(am__v_CC_$(AM_DEFAULT_VERBOSITY)) +am__v_CC_0 = @echo " CC " $@; 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All rights reserved. + * Copyright (c) 2011 Lawrence Livermore National Security, LLC. + */ + +#include +#include +#include +#include +#include +#include +#ifdef HAVE_LIBSELINUX +#include +#endif /* HAVE_LIBSELINUX */ + +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 }, +#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_DFRATIME, MS_STRICTATIME, ZS_COMMENT }, +#endif +#ifdef HAVE_SELINUX + { MNTOPT_CONTEXT, MS_COMMENT, ZS_NOCONTEXT }, + { MNTOPT_NOCONTEXT, MS_COMMENT, ZS_NOCONTEXT }, + { MNTOPT_FSCONTEXT, MS_COMMENT, ZS_NOCONTEXT }, + { MNTOPT_DEFCONTEXT, MS_COMMENT, ZS_NOCONTEXT }, + { MNTOPT_ROOTCONTEXT, MS_COMMENT, ZS_NOCONTEXT }, +#endif +#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_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; + break; + } + } + + for (opt = option_map; opt->name != NULL; opt++) { + if (strncmp(name, opt->name, strlen(name)) == 0) { + *mntflags |= opt->mntmask; + *zfsflags |= opt->zfsmask; + + /* MS_USERS implies default user options */ + if (opt->mntmask & (MS_USERS)) + *mntflags |= (MS_NOEXEC|MS_NOSUID|MS_NODEV); + + /* MS_OWNER|MS_GROUP imply default owner options */ + if (opt->mntmask & (MS_OWNER | MS_GROUP)) + *mntflags |= (MS_NOSUID|MS_NODEV); + + 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) +{ + int error = 0, quote = 0, flag = 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; + } + + opt = NULL; + } + } + +out: + free(opts); + return (error); +} + +/* + * If a file or directory in your current working directory is named + * 'dataset' then mount(8) will prepend your current working directory + * to dataset. The is no way to prevent this behavior so we simply + * check for it and strip the prepended patch when it is added. + */ +static char * +parse_dataset(char *dataset) +{ + char cwd[PATH_MAX]; + + (void) getcwd(cwd, PATH_MAX); + if (!strncmp(cwd, dataset, strlen(cwd))) + return (dataset + strlen(cwd) + 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 = stat(MNTTAB, &st); + if (error || S_ISLNK(st.st_mode)) + return (0); + + fd = open(MNTTAB, 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(MNTTAB, "a+"); + if (!fp) { + (void) fprintf(stderr, gettext( + "filesystem '%s' was mounted, but %s " + "could not be opened due to error %d\n"), + dataset, MNTTAB, errno); + return (MOUNT_FILEIO); + } + + error = addmntent(fp, &mnt); + if (error) { + (void) fprintf(stderr, gettext( + "filesystem '%s' was mounted, but %s " + "could not be updated due to error %d\n"), + dataset, MNTTAB, errno); + return (MOUNT_FILEIO); + } + + (void) endmntent(fp); + + return (MOUNT_SUCCESS); +} + +int +main(int argc, char **argv) +{ + zfs_handle_t *zhp; + char legacy[ZFS_MAXPROPLEN]; + char mntopts[MNT_LINE_MAX] = { '\0' }; + char badopt[MNT_LINE_MAX] = { '\0' }; + char *dataset, *mntpoint; + unsigned long mntflags = 0, zfsflags = 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(argc, argv, "sfnvo:h?")) != -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] \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 \n"); + return (MOUNT_USAGE); + } + + dataset = parse_dataset(argv[0]); + mntpoint = argv[1]; + + /* validate mount options and set mntflags */ + error = parse_options(mntopts, &mntflags, &zfsflags, sloppy, badopt); + 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 EINVAL: + (void) fprintf(stderr, gettext("filesystem '%s' " + "cannot be mounted of due to the 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); + } + } + +#ifdef HAVE_LIBSELINUX + /* + * Automatically add the default zfs context when selinux is enabled + * and the caller has not specified their own context. This must be + * done until zfs is added to the default selinux policy configuration + * as a known filesystem type which supports xattrs. + */ + if (is_selinux_enabled() && !(zfsflags & ZS_NOCONTEXT)) + (void) strlcat(mntopts, ",context=\"system_u:" + "object_r:file_t:s0\"", sizeof (mntopts)); +#endif /* HAVE_LIBSELINUX */ + + + 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\n"), + dataset, mntpoint, mntflags, zfsflags, mntopts); + + if (mntflags & MS_REMOUNT) + nomtab = 1; + + if (zfsflags * ZS_ZFSUTIL) + zfsutil = 1; + + if ((g_zfs = libzfs_init()) == NULL) + return (MOUNT_SYSERR); + + /* try to open the dataset to access the mount point */ + if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_FILESYSTEM)) == NULL) { + (void) fprintf(stderr, gettext("filesystem '%s' cannot be " + "mounted, unable to open the dataset\n"), dataset); + libzfs_fini(g_zfs); + return (MOUNT_USAGE); + } + + (void) zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, legacy, + sizeof (legacy), NULL, NULL, 0, B_FALSE); + + 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. + */ + if (zfsutil && !strcmp(legacy, ZFS_MOUNTPOINT_LEGACY)) { + (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 && 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 EBUSY: + (void) fprintf(stderr, gettext("filesystem " + "'%s' is already mounted\n"), dataset); + return (MOUNT_SYSERR); + 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, mntopts); + if (error) + return (error); + } + + return (MOUNT_SUCCESS); +} -- cgit v1.2.3