/*
* Copyright (c) 2020 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* $Id: //eng/vdo-releases/aluminum/src/c++/vdo/base/vdoResizeLogical.c#6 $
*/
#include "vdoResizeLogical.h"
#include "logger.h"
#include "adminCompletion.h"
#include "blockMap.h"
#include "completion.h"
#include "vdoInternal.h"
typedef enum {
GROW_LOGICAL_PHASE_START = 0,
GROW_LOGICAL_PHASE_GROW_BLOCK_MAP,
GROW_LOGICAL_PHASE_END,
GROW_LOGICAL_PHASE_ERROR,
} GrowLogicalPhase;
static const char *GROW_LOGICAL_PHASE_NAMES[] = {
"GROW_LOGICAL_PHASE_START",
"GROW_LOGICAL_PHASE_GROW_BLOCK_MAP",
"GROW_LOGICAL_PHASE_END",
"GROW_LOGICAL_PHASE_ERROR",
};
/**
* Implements ThreadIDGetterForPhase.
**/
__attribute__((warn_unused_result))
static ThreadID getThreadIDForPhase(AdminCompletion *adminCompletion)
{
return getAdminThread(getThreadConfig(adminCompletion->completion.parent));
}
/**
* Callback to initiate a grow logical, registered in performGrowLogical().
*
* @param completion The sub-task completion
**/
static void growLogicalCallback(VDOCompletion *completion)
{
AdminCompletion *adminCompletion = adminCompletionFromSubTask(completion);
assertAdminOperationType(adminCompletion, ADMIN_OPERATION_GROW_LOGICAL);
assertAdminPhaseThread(adminCompletion, __func__, GROW_LOGICAL_PHASE_NAMES);
VDO *vdo = adminCompletion->completion.parent;
switch (adminCompletion->phase++) {
case GROW_LOGICAL_PHASE_START:
if (isReadOnly(vdo->readOnlyNotifier)) {
logErrorWithStringError(VDO_READ_ONLY,
"Can't grow logical size of a read-only VDO");
finishCompletion(resetAdminSubTask(completion), VDO_READ_ONLY);
return;
}
if (startOperationWithWaiter(&vdo->adminState,
ADMIN_STATE_SUSPENDED_OPERATION,
&adminCompletion->completion, NULL)) {
vdo->config.logicalBlocks = getNewEntryCount(getBlockMap(vdo));
saveVDOComponentsAsync(vdo, resetAdminSubTask(completion));
}
return;
case GROW_LOGICAL_PHASE_GROW_BLOCK_MAP:
growBlockMap(getBlockMap(vdo), resetAdminSubTask(completion));
return;
case GROW_LOGICAL_PHASE_END:
break;
case GROW_LOGICAL_PHASE_ERROR:
enterReadOnlyMode(vdo->readOnlyNotifier, completion->result);
break;
default:
setCompletionResult(resetAdminSubTask(completion), UDS_BAD_STATE);
}
finishOperationWithResult(&vdo->adminState, completion->result);
}
/**
* Handle an error during the grow physical process.
*
* @param completion The sub-task completion
**/
static void handleGrowthError(VDOCompletion *completion)
{
AdminCompletion *adminCompletion = adminCompletionFromSubTask(completion);
if (adminCompletion->phase == GROW_LOGICAL_PHASE_GROW_BLOCK_MAP) {
// We've failed to write the new size in the super block, so set our
// in memory config back to the old size.
VDO *vdo = adminCompletion->completion.parent;
BlockMap *map = getBlockMap(vdo);
vdo->config.logicalBlocks = getNumberOfBlockMapEntries(map);
abandonBlockMapGrowth(map);
}
adminCompletion->phase = GROW_LOGICAL_PHASE_ERROR;
growLogicalCallback(completion);
}
/**********************************************************************/
int performGrowLogical(VDO *vdo, BlockCount newLogicalBlocks)
{
if (getNewEntryCount(getBlockMap(vdo)) != newLogicalBlocks) {
return VDO_PARAMETER_MISMATCH;
}
return performAdminOperation(vdo, ADMIN_OPERATION_GROW_LOGICAL,
getThreadIDForPhase, growLogicalCallback,
handleGrowthError);
}
/**********************************************************************/
int prepareToGrowLogical(VDO *vdo, BlockCount newLogicalBlocks)
{
if (newLogicalBlocks < vdo->config.logicalBlocks) {
return logErrorWithStringError(VDO_PARAMETER_MISMATCH,
"Can't shrink VDO logical size from its "
"current value of %llu",
vdo->config.logicalBlocks);
}
if (newLogicalBlocks == vdo->config.logicalBlocks) {
return logErrorWithStringError(VDO_PARAMETER_MISMATCH,
"Can't grow VDO logical size to its "
"current value of %llu",
vdo->config.logicalBlocks);
}
return prepareToGrowBlockMap(getBlockMap(vdo), newLogicalBlocks);
}