pmemobj_convert_v4.c

// SPDX-License-Identifier: BSD-3-Clause
/* Copyright 2014-2019, Intel Corporation */

#include <assert.h>
#include <endian.h>
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/mman.h>

#include "libpmem.h"

#include "pmemobj_convert.h"
#include "libpmemobj.h"
#include "set.h"
#include "common.h"
#include "output.h"

/*
 * pool_set_file_unmap_headers -- unmap headers of each pool set part file
 */
static void
pool_set_file_unmap_headers(struct pool_set_file *file)
{
	if (!file->poolset)
		return;
	for (unsigned r = 0; r < file->poolset->nreplicas; r++) {
		struct pool_replica *rep = file->poolset->replica[r];
		for (unsigned p = 0; p < rep->nparts; p++) {
			struct pool_set_part *part = &rep->part[p];
			util_unmap_hdr(part);
		}
	}
}

/*
 * pool_set_file_map_headers -- map headers of each pool set part file
 */
static int
pool_set_file_map_headers(struct pool_set_file *file, int rdonly)
{
	if (!file->poolset)
		return -1;

	int flags = rdonly ? MAP_PRIVATE : MAP_SHARED;
	for (unsigned r = 0; r < file->poolset->nreplicas; r++) {
		struct pool_replica *rep = file->poolset->replica[r];
		for (unsigned p = 0; p < rep->nparts; p++) {
			struct pool_set_part *part = &rep->part[p];
			if (util_map_hdr(part, flags, 0)) {
				part->hdr = NULL;
				goto err;
			}
		}
	}

	return 0;
err:
	pool_set_file_unmap_headers(file);
	return -1;
}

static void
pmemobj_convert_persist(const void *addr, size_t size)
{
	/* device dax */
	pmem_persist(addr, size);
	/*
	 * fs dax / nonpmem, will fail for ddax, but it doesn't
	 * matter
	 */
	pmem_msync(addr, size);
}

/*
 * pmemobj_convert - convert a pool to the next layout version
 */
const char *
pmemobj_convert(const char *path, unsigned force)
{
	/* open the pool and perform recovery */
	PMEMobjpool *pop = pmemobj_open(path, NULL);
	if (!pop)
		return pmemobj_errormsg();

	/* now recovery state is clean, so we can zero it out */
	struct lane_layout *lanes =
			(struct lane_layout *)((char *)pop + pop->lanes_offset);
	memset(lanes, 0, pop->nlanes * sizeof(struct lane_layout));
	pmemobj_persist(pop, lanes, pop->nlanes * sizeof(struct lane_layout));

	pmemobj_close(pop);

	const char *ret = NULL;
	struct pmem_pool_params params;
	if (pmem_pool_parse_params(path, &params, 1))
		return get_error("cannot open pool: %s", strerror(errno));

	struct pool_set_file *psf = pool_set_file_open(path, 0, 1);
	if (psf == NULL) {
		return get_error("pool_set_file_open failed: %s",
				strerror(errno));
	}

	if (psf->poolset->remote) {
		ret = get_error("Conversion of remotely replicated pools is "
			"currently not supported. Remove the replica first");
		goto pool_set_close;
	}

	void *addr = pool_set_file_map(psf, 0);
	if (addr == NULL) {
		ret = "mapping file failed";
		goto pool_set_close;
	}

	struct pool_hdr *phdr = addr;
	uint32_t m = le32toh(phdr->major);
	if (m != OBJ_FORMAT_MAJOR) {
		/* shouldn't be possible, because pool open succeeded earlier */
		ret = get_error("invalid pool version: %d", m);
		goto pool_set_close;
	}

	if (pool_set_file_map_headers(psf, 0)) {
		ret = get_error("mapping headers failed: %s", strerror(errno));
		goto pool_set_close;
	}

	/* need to update every header of every part */
	for (unsigned r = 0; r < psf->poolset->nreplicas; ++r) {
		struct pool_replica *rep = psf->poolset->replica[r];
		for (unsigned p = 0; p < rep->nparts; ++p) {
			struct pool_set_part *part = &rep->part[p];

			struct pool_hdr *hdr = part->hdr;
			assert(hdr->major == OBJ_FORMAT_MAJOR);
			hdr->major = htole32(OBJ_FORMAT_MAJOR + 1);
			util_checksum(hdr, sizeof(*hdr), &hdr->checksum, 1,
					POOL_HDR_CSUM_END_OFF);
			pmemobj_convert_persist(hdr, sizeof(struct pool_hdr));

			if (le32toh(hdr->incompat_features) &
					POOL_FEAT_SINGLEHDR)
				break;
		}
	}

	pool_set_file_unmap_headers(psf);

pool_set_close:
	pool_set_file_close(psf);

	return ret;
}

/*
 * pmemobj_convert_try_open - return if a pool is openable by this pmdk verison
 */
int
pmemobj_convert_try_open(char *path)
{
	PMEMobjpool *pop = pmemobj_open(path, NULL);

	if (!pop)
		return 1;

	pmemobj_close(pop);
	return 0;
}