コード例 #1
0
ファイル: libzfs_changelist.c プロジェクト: roddi/mac-zfs
/*
 * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
 * reshare the filesystems as necessary.  In changelist_gather() we recorded
 * whether the filesystem was previously shared or mounted.  The action we take
 * depends on the previous state, and whether the value was previously 'legacy'.
 * For non-legacy properties, we only remount/reshare the filesystem if it was
 * previously mounted/shared.  Otherwise, we always remount/reshare the
 * filesystem.
 */
int
changelist_postfix(prop_changelist_t *clp)
{
	prop_changenode_t *cn;
	char shareopts[ZFS_MAXPROPLEN];
	int ret = 0;
	libzfs_handle_t *hdl;

	/*
	 * If we're changing the mountpoint, attempt to destroy the underlying
	 * mountpoint.  All other datasets will have inherited from this dataset
	 * (in which case their mountpoints exist in the filesystem in the new
	 * location), or have explicit mountpoints set (in which case they won't
	 * be in the changelist).
	 */
	if ((cn = uu_list_last(clp->cl_list)) == NULL)
		return (0);

	if (clp->cl_prop == ZFS_PROP_MOUNTPOINT)
		remove_mountpoint(cn->cn_handle);

	/*
	 * It is possible that the changelist_prefix() used libshare
	 * to unshare some entries. Since libshare caches data, an
	 * attempt to reshare during postfix can fail unless libshare
	 * is uninitialized here so that it will reinitialize later.
	 */
	if (cn->cn_handle != NULL) {
		hdl = cn->cn_handle->zfs_hdl;
		assert(hdl != NULL);
#ifndef __APPLE__
		zfs_uninit_libshare(hdl);
#endif
	}

	/*
	 * We walk the datasets in reverse, because we want to mount any parent
	 * datasets before mounting the children.
	 */
	for (cn = uu_list_last(clp->cl_list); cn != NULL;
	    cn = uu_list_prev(clp->cl_list, cn)) {

		boolean_t sharenfs;

#ifndef __APPLE__
		/*
		 * If we are in the global zone, but this dataset is exported
		 * to a local zone, do nothing.
		 */
		if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
			continue;
#endif /*!__APPLE__*/

		zfs_refresh_properties(cn->cn_handle);

		if (ZFS_IS_VOLUME(cn->cn_handle)) {
			/*
			 * If we're doing a rename, recreate the /dev/zvol
			 * links.
			 */
			if (clp->cl_realprop == ZFS_PROP_NAME &&
			    zvol_create_link(cn->cn_handle->zfs_hdl,
			    cn->cn_handle->zfs_name) != 0) {
				ret = -1;
			} else if (cn->cn_shared ||
			    clp->cl_prop == ZFS_PROP_SHAREISCSI) {
				if (zfs_prop_get(cn->cn_handle,
				    ZFS_PROP_SHAREISCSI, shareopts,
				    sizeof (shareopts), NULL, NULL, 0,
				    B_FALSE) == 0 &&
				    strcmp(shareopts, "off") == 0) {
					ret = zfs_unshare_iscsi(cn->cn_handle);
				} else {
					ret = zfs_share_iscsi(cn->cn_handle);
				}
			}

			continue;
		}

		/*
		 * Remount if previously mounted or mountpoint was legacy,
		 * or sharenfs property is set.
		 */
		sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
		    shareopts, sizeof (shareopts), NULL, NULL, 0,
		    B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));

		if ((cn->cn_mounted || clp->cl_waslegacy || sharenfs) &&
		    !zfs_is_mounted(cn->cn_handle, NULL) &&
		    zfs_mount(cn->cn_handle, NULL, 0) != 0)
			ret = -1;

		/*
		 * We always re-share even if the filesystem is currently
		 * shared, so that we can adopt any new options.
		 */
		if (cn->cn_shared || clp->cl_waslegacy || sharenfs) {
			if (sharenfs)
				ret = zfs_share_nfs(cn->cn_handle);
			else
				ret = zfs_unshare_nfs(cn->cn_handle, NULL);
		}
	}

	return (ret);
}
コード例 #2
0
/*
 * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or
 * reshare the filesystems as necessary.  In changelist_gather() we recorded
 * whether the filesystem was previously shared or mounted.  The action we take
 * depends on the previous state, and whether the value was previously 'legacy'.
 * For non-legacy properties, we only remount/reshare the filesystem if it was
 * previously mounted/shared.  Otherwise, we always remount/reshare the
 * filesystem.
 */
int
changelist_postfix(prop_changelist_t *clp)
{
	prop_changenode_t *cn;
	char shareopts[ZFS_MAXPROPLEN];
	int errors = 0;
	libzfs_handle_t *hdl;

	/*
	 * If we're changing the mountpoint, attempt to destroy the underlying
	 * mountpoint.  All other datasets will have inherited from this dataset
	 * (in which case their mountpoints exist in the filesystem in the new
	 * location), or have explicit mountpoints set (in which case they won't
	 * be in the changelist).
	 */
	if ((cn = uu_list_last(clp->cl_list)) == NULL)
		return (0);

	if (clp->cl_prop == ZFS_PROP_MOUNTPOINT &&
	    !(clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)) {
		remove_mountpoint(cn->cn_handle);
	}

	/*
	 * It is possible that the changelist_prefix() used libshare
	 * to unshare some entries. Since libshare caches data, an
	 * attempt to reshare during postfix can fail unless libshare
	 * is uninitialized here so that it will reinitialize later.
	 */
	if (cn->cn_handle != NULL) {
		hdl = cn->cn_handle->zfs_hdl;
		assert(hdl != NULL);
		zfs_uninit_libshare(hdl);
	}

	/*
	 * We walk the datasets in reverse, because we want to mount any parent
	 * datasets before mounting the children.  We walk all datasets even if
	 * there are errors.
	 */
	for (cn = uu_list_last(clp->cl_list); cn != NULL;
	    cn = uu_list_prev(clp->cl_list, cn)) {

		boolean_t sharenfs;
		boolean_t sharesmb;
		boolean_t mounted;

		/*
		 * If we are in the global zone, but this dataset is exported
		 * to a local zone, do nothing.
		 */
		if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned)
			continue;

		/* Only do post-processing if it's required */
		if (!cn->cn_needpost)
			continue;
		cn->cn_needpost = B_FALSE;

		zfs_refresh_properties(cn->cn_handle);

		if (ZFS_IS_VOLUME(cn->cn_handle))
			continue;

		/*
		 * Remount if previously mounted or mountpoint was legacy,
		 * or sharenfs or sharesmb  property is set.
		 */
		sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS,
		    shareopts, sizeof (shareopts), NULL, NULL, 0,
		    B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));

		sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB,
		    shareopts, sizeof (shareopts), NULL, NULL, 0,
		    B_FALSE) == 0) && (strcmp(shareopts, "off") != 0));

		mounted = (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT) ||
		    zfs_is_mounted(cn->cn_handle, NULL);

		if (!mounted && (cn->cn_mounted ||
		    ((sharenfs || sharesmb || clp->cl_waslegacy) &&
		    (zfs_prop_get_int(cn->cn_handle,
		    ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) {

			if (zfs_mount(cn->cn_handle, NULL, 0) != 0)
				errors++;
			else
				mounted = TRUE;
		}

		/*
		 * If the file system is mounted we always re-share even
		 * if the filesystem is currently shared, so that we can
		 * adopt any new options.
		 */
		if (sharenfs && mounted)
			errors += zfs_share_nfs(cn->cn_handle);
		else if (cn->cn_shared || clp->cl_waslegacy)
			errors += zfs_unshare_nfs(cn->cn_handle, NULL);
		if (sharesmb && mounted)
			errors += zfs_share_smb(cn->cn_handle);
		else if (cn->cn_shared || clp->cl_waslegacy)
			errors += zfs_unshare_smb(cn->cn_handle, NULL);
	}

	return (errors ? -1 : 0);
}
コード例 #3
0
ファイル: libzfs_mount.c プロジェクト: Spencerx/zfs-1
/*
 * Mount the given filesystem.
 *
 * 'flags' appears pretty much always 0 here.
 */
int
zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
{
	struct stat buf;
	char mountpoint[ZFS_MAXPROPLEN];
	char mntopts[MNT_LINE_MAX];
	libzfs_handle_t *hdl = zhp->zfs_hdl;
	int remount;

	if (options == NULL) {
		mntopts[0] = '\0';
	} else {
		(void) strlcpy(mntopts, options, sizeof (mntopts));
	}

	if (strstr(mntopts, MNTOPT_REMOUNT) != NULL)
		remount = 1;

	/*
	 * If the pool is imported read-only then all mounts must be read-only
	 */
#ifdef __LINUX__
	if (zpool_get_prop_int(zhp->zpool_hdl, ZPOOL_PROP_READONLY, NULL))
		(void) strlcat(mntopts, "," MNTOPT_RO, sizeof (mntopts));
#else
	if (zpool_get_prop_int(zhp->zpool_hdl, ZPOOL_PROP_READONLY, NULL))
		flags |= MS_RDONLY;
#endif /* __LINUX__ */

	if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
		return (0);

#ifdef __LINUX__

	/*
	 * Append default mount options which apply to the mount point.
	 * This is done because under Linux (unlike Solaris) multiple mount
	 * points may reference a single super block.  This means that just
	 * given a super block there is no back reference to update the per
	 * mount point options.
	 */
	rc = zfs_add_options(zhp, &flags);
	if (rc) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "default options unavailable"));
		return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
		    dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
		    mountpoint));
	}

	/*
	 * Append zfsutil option so the mount helper allow the mount
	 */
	strlcat(mntopts, "," MNTOPT_ZFSUTIL, sizeof (mntopts));
#endif /* __LINUX__ */

	/* Create the directory if it doesn't already exist */
#ifdef __APPLE__
	if (zfs_get_type(zhp) != ZFS_TYPE_SNAPSHOT &&
	    lstat(mountpoint, &buf) != 0) {
#else
	if (lstat(mountpoint, &buf) != 0) {
#endif
		if (mkdirp(mountpoint, 0755) != 0) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "failed to create mountpoint"));
			return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
			    dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
			    mountpoint));
		}

	}

	/*
	 * Determine if the mountpoint is empty.  If so, refuse to perform the
	 * mount.  We don't perform this check if 'remount' is
	 * specified or if overlay option(-O) is given
	 */
	if ((flags & MS_OVERLAY) == 0 && !remount &&
	    !dir_is_empty(mountpoint)) {
		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
		    "directory is not empty"));
		return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
		    dgettext(TEXT_DOMAIN, "cannot mount '%s'"), mountpoint));
	}

	/* perform the mount */
#ifdef __LINUX__
	rc = do_mount(zfs_get_name(zhp), mountpoint, mntopts);
#elif defined(__APPLE__) || defined (__FREEBSD__)
	if (zmount(zfs_get_name(zhp), mountpoint, MS_OPTIONSTR | flags,
	    MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) {
#elif defined(__illumos__)
	if (mount(zfs_get_name(zhp), mountpoint, MS_OPTIONSTR | flags,
	    MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) {
#endif /* __LINUX__*/
		/*
		 * Generic errors are nasty, but there are just way too many
		 * from mount(), and they're well-understood.  We pick a few
		 * common ones to improve upon.
		 */
		if (errno == EBUSY) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "mountpoint or dataset is busy"));
		} else if (errno == EPERM) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "Insufficient privileges"));
		} else if (errno == ENOTSUP) {
			char buf[256];
			int spa_version;

			VERIFY(zfs_spa_version(zhp, &spa_version) == 0);
			(void) snprintf(buf, sizeof (buf),
			    dgettext(TEXT_DOMAIN, "Can't mount a version %lld "
			    "file system on a version %d pool. Pool must be"
			    " upgraded to mount this file system."),
			    (u_longlong_t)zfs_prop_get_int(zhp,
			    ZFS_PROP_VERSION), spa_version);
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, buf));
#ifdef __APPLE__
		} else if (((errno == ESRCH) || (errno == EINVAL) ||
		    (errno == ENOENT && lstat(mountpoint, &buf) != 0)) &&
		    zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT) {
			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
			    "The parent file system must be mounted first."));
#endif
		} else {
			zfs_error_aux(hdl, strerror(errno));
		}
		return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
		    dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
		    zhp->zfs_name));
	}

#ifdef __APPLE__
	if (zhp->zfs_type == ZFS_TYPE_SNAPSHOT)
		fprintf(stderr, "ZFS: snapshot mountpoint '%s'\n", mountpoint);

	if (!(flags & MS_RDONLY))
		zfs_mount_seticon(mountpoint);
#endif

	/* remove the mounted entry before re-adding on remount */
	if (remount)
		libzfs_mnttab_remove(hdl, zhp->zfs_name);

	/* add the mounted entry into our cache */
	libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint, mntopts);
	return (0);
}

/*
 * Unmount a single filesystem.
 */
static int
unmount_one(libzfs_handle_t *hdl, const char *mountpoint, int flags)
{
    int error;
#if 0
    error = unmount(mountpoint, flags);
    if (unmount(mountpoint, flags) != 0) {
		return (zfs_error_fmt(hdl, EZFS_UMOUNTFAILED,
		    dgettext(TEXT_DOMAIN, "cannot unmount '%s'"),
		    mountpoint));
	}
#else
    error = do_unmount(mountpoint, flags);
    if (error != 0) {
        return (zfs_error_fmt(hdl, EZFS_UMOUNTFAILED,
                              dgettext(TEXT_DOMAIN, "cannot unmount '%s'"),
                    mountpoint));
    }
#endif

	return (0);
}

/*
 * Unmount the given filesystem.
 */
int
zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags)
{
	libzfs_handle_t *hdl = zhp->zfs_hdl;
#ifdef __LINUX__
	struct mnttab search = { 0 }, entry;
#else
	struct mnttab entry;
#endif /* __LINUX__ */
	char *mntpt = NULL;

	/* check to see if need to unmount the filesystem */
	if (mountpoint != NULL ||
	    (((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) ||
	    (zfs_get_type(zhp) == ZFS_TYPE_SNAPSHOT)) &&
	    libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0)) {

		/*
		 * mountpoint may have come from a call to
		 * getmnt/getmntany if it isn't NULL. If it is NULL,
		 * we know it comes from getmntany which can then get
		 * overwritten later. We strdup it to play it safe.
		 */
		if (mountpoint == NULL)
			mntpt = zfs_strdup(zhp->zfs_hdl, entry.mnt_mountp);
		else
			mntpt = zfs_strdup(zhp->zfs_hdl, mountpoint);

		/*
		 * Unshare and unmount the filesystem
		 */
#ifdef __illumos__
		if (zfs_unshare_proto(zhp, mntpt, share_all_proto) != 0)
#else
		if (zfs_unshare_nfs(zhp, mntpt) != 0)
#endif
		return (-1);

		if (unmount_one(hdl, mntpt, flags) != 0) {
			free(mntpt);
#ifdef __illumos__
			(void) zfs_shareall(zhp);
#else
			(void) zfs_share_nfs(zhp);
#endif
			return (-1);
		}
		libzfs_mnttab_remove(hdl, zhp->zfs_name);
		free(mntpt);

	}

	return (0);
}