/*
* If the property is 'mountpoint', go through and unmount filesystems as
* necessary. We don't do the same for 'sharenfs', because we can just re-share
* with different options without interrupting service. We do handle 'sharesmb'
* since there may be old resource names that need to be removed.
*/
int
changelist_prefix(prop_changelist_t *clp)
{
prop_changenode_t *cn;
int ret = 0;
if (clp->cl_prop != ZFS_PROP_MOUNTPOINT &&
clp->cl_prop != ZFS_PROP_SHARESMB)
return (0);
for (cn = uu_list_first(clp->cl_list); cn != NULL;
cn = uu_list_next(clp->cl_list, cn)) {
/* if a previous loop failed, set the remaining to false */
if (ret == -1) {
cn->cn_needpost = B_FALSE;
continue;
}
/*
* 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;
if (!ZFS_IS_VOLUME(cn->cn_handle)) {
/*
* Do the property specific processing.
*/
switch (clp->cl_prop) {
case ZFS_PROP_MOUNTPOINT:
if (zfs_unmount(cn->cn_handle, NULL,
clp->cl_mflags) != 0) {
ret = -1;
cn->cn_needpost = B_FALSE;
}
break;
case ZFS_PROP_SHARESMB:
(void) zfs_unshare_smb(cn->cn_handle, NULL);
break;
default:
break;
}
}
}
if (ret == -1) {
#if defined(HAVE_ZPL)
(void) changelist_postfix(clp);
#else
ret = changelist_postfix(clp);
#endif
}
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);
}
