/*
* demand attach fs
* save all fileserver state
*/
int
fs_stateSave(void)
{
int ret = 0, verified = 1;
struct fs_dump_state state;
/* save and restore need to be atomic wrt other host package operations */
H_LOCK;
ViceLog(0, ("fs_stateSave: commencing fileserver state dump\n"));
if (fs_stateAlloc(&state)) {
ViceLog(0, ("fs_stateSave: memory allocation failed; dump aborted\n"));
ret = 1;
goto done;
}
/* XXX
* on busy servers, these checks will inevitably fail since stuff drops H_LOCK
* all over the place (with structs left in inconsistent states) while RPCs to
* clients happen (grumble, grumble, the host package needs to be rewritten...)
*
* the current hack is to force the background threads that deal with host and
* callback state offline early in the shutdown process, do VShutdown, come
* back and wait for those threads to die, THEN do the state dump
*
* BUT, this still has one flaw -- what do we do about rx worker threads that
* are blocked in the host package making an RPC call to a cm???
*
* perhaps we need a refcounter that keeps track of threads blocked in rpc calls
* with H_LOCK dropped (and the host struct likely left in an inconsistent state)
*
* or better yet, we need to associate a state machine with each host object
* (kind of like demand attach Volume structures).
*
* sigh. I suspect we'll need to revisit this issue
*/
if (fs_state.options.fs_state_verify_before_save) {
ViceLog(0, ("fs_stateSave: performing internal consistency checks before proceeding with state dump\n"));
if (h_stateVerify(&state)) {
ViceLog(0, ("fs_stateSave: error: host table consistency checks failed; state dump will not be marked clean\n"));
verified = 0;
ret = 1;
}
if (cb_stateVerify(&state)) {
ViceLog(0, ("fs_stateSave: error: callback table consistency checks failed; state dump will not be marked clean\n"));
verified = 0;
ret = 1;
}
/* if a consistency check asserted the bail flag, reset it */
state.bail = 0;
ViceLog(0, ("fs_stateSave: proceeding with dump\n"));
}
if (fs_stateCreateDump(&state)) {
ViceLog(0, ("fs_stateSave: error: dump create failed\n"));
ret = 1;
goto done;
}
if (h_stateSave(&state)) {
ViceLog(0, ("fs_stateSave: error: host state dump failed\n"));
ret = 1;
goto done;
}
if (cb_stateSave(&state)) {
ViceLog(0, ("fs_stateSave: error: callback state dump failed\n"));
ret = 1;
goto done;
}
if (!verified) {
state.bail = 1;
}
if (fs_stateCommitDump(&state)) {
ViceLog(0, ("fs_stateSave: error: dump commit failed\n"));
ret = 1;
goto done;
}
if (verified) {
ViceLog(0, ("fs_stateSave: fileserver state dump completed successfully\n"));
} else {
ViceLog(0, ("fs_stateSave: fileserver state dump completed, but not marked clean.\n"));
ViceLog(0, ("fs_stateSave: please save a copy of '%s' for use by technical support\n",
state.fn));
}
done:
if (fs_stateFileOpen(&state))
fs_stateCloseDump(&state);
fs_stateFree(&state);
H_UNLOCK;
return ret;
}
/*
* demand attach fs
* restore all fileserver state
*
* this function must appear as one atomic operation to the host and callback
* packages, hence H_LOCK is held for the entirety of the process.
*/
int
fs_stateRestore(void)
{
int ret = 0;
struct fs_dump_state state;
/* save and restore need to be atomic wrt other host package operations */
H_LOCK;
ViceLog(0, ("fs_stateRestore: commencing fileserver state restore\n"));
if (fs_stateAlloc(&state)) {
ViceLog(0, ("fs_stateRestore: memory allocation failed\n"));
ret = 1;
goto done;
}
if (fs_stateLoadDump(&state)) {
ViceLog(0, ("fs_stateRestore: failed to load dump file '%s'\n", state.fn));
ret = 1;
goto done;
}
if (fs_stateInvalidateDump(&state)) {
ViceLog(0, ("fs_stateRestore: failed to invalidate dump file '%s'\n", state.fn));
ret = 1;
goto done;
}
if (state.flags.do_host_restore) {
if (h_stateRestore(&state)) {
ViceLog(0, ("fs_stateRestore: error: host state restore failed. exiting avoid further corruption\n"));
exit(0);
}
ViceLog(0, ("fs_stateRestore: host table restored\n"));
if (cb_stateRestore(&state)) {
ViceLog(0, ("fs_stateRestore: error: callback state restore failed. exiting to avoid further corruption\n"));
exit(0);
}
ViceLog(0, ("fs_stateRestore: FileEntry and CallBack tables restored\n"));
if (h_stateRestoreIndices(&state)) {
ViceLog(0, ("fs_stateRestore: error: host index remapping failed. exiting to avoid further corruption\n"));
exit(0);
}
ViceLog(0, ("fs_stateRestore: host table indices remapped\n"));
if (cb_stateRestoreIndices(&state)) {
ViceLog(0, ("fs_stateRestore: error: callback index remapping failed. exiting to avoid further corruption\n"));
exit(0);
}
ViceLog(0, ("fs_stateRestore: FileEntry and CallBack indices remapped\n"));
}
ViceLog(0, ("fs_stateRestore: restore phase complete\n"));
if (fs_state.options.fs_state_verify_after_restore) {
ViceLog(0, ("fs_stateRestore: beginning state verification phase\n"));
if (state.flags.do_host_restore) {
if (h_stateVerify(&state)) {
ViceLog(0, ("fs_stateRestore: error: host table consistency checks failed; exiting to avoid further corruption\n"));
exit(0);
}
if (cb_stateVerify(&state)) {
ViceLog(0, ("fs_stateRestore: error: callback table consistency checks failed; exiting to avoid further corruption\n"));
exit(0);
}
}
ViceLog(0, ("fs_stateRestore: fileserver state verification complete\n"));
}
ViceLog(0, ("fs_stateRestore: restore was successful\n"));
done:
if (state.fd >= 0) {
fs_stateInvalidateDump(&state);
fs_stateCloseDump(&state);
}
fs_stateFree(&state);
H_UNLOCK;
return ret;
}
/*
* demand attach fs
* save all fileserver state
*/
int
fs_stateSave(void)
{
int ret = 0, verified = 1;
struct fs_dump_state state;
/* save and restore need to be atomic wrt other host package operations */
H_LOCK;
ViceLog(0, ("fs_stateSave: commencing fileserver state dump\n"));
if (fs_stateAlloc(&state)) {
ViceLog(0, ("fs_stateSave: memory allocation failed; dump aborted\n"));
ret = 1;
goto done;
}
/* XXX
* on busy servers, these checks will inevitably fail since stuff drops H_LOCK
* all over the place (with structs left in inconsistent states) while RPCs to
* clients happen (grumble, grumble, the host package needs to be rewritten...)
*
* the current hack is to force the background threads that deal with host and
* callback state offline early in the shutdown process, do VShutdown, come
* back and wait for those threads to die, THEN do the state dump
*
* BUT, this still has one flaw -- what do we do about rx worker threads that
* are blocked in the host package making an RPC call to a cm???
*
* currently we try to detect if a host struct is in an inconsistent state
* when we go to save it to disk, and just skip the hosts that we think may
* be inconsistent (see h_isBusy_r in host.c). This has the problem of causing
* more InitCallBackState's when we come back up, but the number of hosts in
* such a state should be small. In the future, we could try to lock hosts
* (with some deadline so we don't wait forever) before serializing, but at
* least for now it does not seem worth the trouble.
*/
if (fs_state.options.fs_state_verify_before_save) {
ViceLog(0, ("fs_stateSave: performing internal consistency checks before proceeding with state dump\n"));
if (h_stateVerify(&state)) {
ViceLog(0, ("fs_stateSave: error: host table consistency checks failed; state dump will not be marked clean\n"));
verified = 0;
ret = 1;
}
if (cb_stateVerify(&state)) {
ViceLog(0, ("fs_stateSave: error: callback table consistency checks failed; state dump will not be marked clean\n"));
verified = 0;
ret = 1;
}
/* if a consistency check asserted the bail flag, reset it */
state.bail = 0;
ViceLog(0, ("fs_stateSave: proceeding with dump\n"));
}
if (fs_stateCreateDump(&state)) {
ViceLog(0, ("fs_stateSave: error: dump create failed\n"));
ret = 1;
goto done;
}
if (h_stateSave(&state)) {
ViceLog(0, ("fs_stateSave: error: host state dump failed\n"));
ret = 1;
goto done;
}
if (cb_stateSave(&state)) {
ViceLog(0, ("fs_stateSave: error: callback state dump failed\n"));
ret = 1;
goto done;
}
if (!verified) {
state.bail = 1;
}
if (fs_stateCommitDump(&state)) {
ViceLog(0, ("fs_stateSave: error: dump commit failed\n"));
ret = 1;
goto done;
}
if (verified) {
ViceLog(0, ("fs_stateSave: fileserver state dump completed successfully\n"));
} else {
ViceLog(0, ("fs_stateSave: fileserver state dump completed, but not marked clean.\n"));
ViceLog(0, ("fs_stateSave: please save a copy of '%s' for use by technical support\n",
state.fn));
}
done:
if (fs_stateFileOpen(&state))
fs_stateCloseDump(&state);
fs_stateFree(&state);
H_UNLOCK;
return ret;
}