pmemobj_convert_v2.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 "common.h"
#include "output.h"

/*
 * outv_err_vargs -- print error message
 */
void
outv_err_vargs(const char *fmt, va_list ap)
{
	fprintf(stderr, "error: ");
	vfprintf(stderr, fmt, ap);
	if (!strchr(fmt, '\n'))
		fprintf(stderr, "\n");
}

/*
 * outv_err -- print error message
 */
void
outv_err(const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	outv_err_vargs(fmt, ap);
	va_end(ap);
}

/*
 * 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)) {
				part->hdr = NULL;
				goto err;
			}
		}
	}

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

/*
 * 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();

	pmemobj_close(pop);

	printf(
		"\nThe conversion to 1.2 can only be made automatically if the PMEMmutex,\n"
		"PMEMrwlock and PMEMcond types are not used in the pool or all of the variables\n"
		"of those three types are aligned to 8 bytes. Proceed only if you are sure that\n"
		"the above is true for this pool.\n");
	if (force & QUEST_12_PMEMMUTEX) {
		printf("Operation forced by user.\n");
	} else {
		char ans = ask_yN('?', "convert the pool?");
		if (ans != 'y') {
			errno = ECANCELED;
			return "Operation canceled by user";
		}
	}

	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));
	}

	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);
			pmem_msync(hdr, sizeof(struct pool_hdr));
		}
	}

	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;
}