linux/drivers/md/dm-snap-transient.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2001-2002 Sistina Software (UK) Limited.
 * Copyright (C) 2006-2008 Red Hat GmbH
 *
 * This file is released under the GPL.
 */

#include "dm-exception-store.h"

#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/dm-io.h>

#define DM_MSG_PREFIX …

/*
 *---------------------------------------------------------------
 * Implementation of the store for non-persistent snapshots.
 *---------------------------------------------------------------
 */
struct transient_c { … };

static void transient_dtr(struct dm_exception_store *store)
{ … }

static int transient_read_metadata(struct dm_exception_store *store,
				   int (*callback)(void *callback_context,
						   chunk_t old, chunk_t new),
				   void *callback_context)
{ … }

static int transient_prepare_exception(struct dm_exception_store *store,
				       struct dm_exception *e)
{ … }

static void transient_commit_exception(struct dm_exception_store *store,
				       struct dm_exception *e, int valid,
				       void (*callback)(void *, int success),
				       void *callback_context)
{ … }

static void transient_usage(struct dm_exception_store *store,
			    sector_t *total_sectors,
			    sector_t *sectors_allocated,
			    sector_t *metadata_sectors)
{ … }

static int transient_ctr(struct dm_exception_store *store, char *options)
{ … }

static unsigned int transient_status(struct dm_exception_store *store,
				 status_type_t status, char *result,
				 unsigned int maxlen)
{ … }

static struct dm_exception_store_type _transient_type = …;

static struct dm_exception_store_type _transient_compat_type = …;

int dm_transient_snapshot_init(void)
{ … }

void dm_transient_snapshot_exit(void)
{ … }