/*
* 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);
}
/*
* 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);
}
/*
* 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);
}
