lvm2/lib/metadata/pv_list.c

/*
 * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
 * Copyright (C) 2004-2017 Red Hat, Inc. All rights reserved.
 *
 * This file is part of LVM2.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License v.2.1.
 *
 * You should have received a copy of the GNU Lesser 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
 */

#include "lib/misc/lib.h"
#include "lib/misc/lvm-string.h"
#include "lib/datastruct/str_list.h"
#include "lib/device/device.h"
#include "lib/metadata/metadata.h"

/*
 * Process physical extent range specifiers
 */
static int _add_pe_range(struct dm_pool *mem, const char *pvname,
			 struct dm_list *pe_ranges, uint32_t start, uint32_t count)
{
	struct pe_range *per;

	log_debug("Adding PE range: start PE " FMTu32 " length " FMTu32 " on %s.",
		  start, count, pvname);

	/* Ensure no overlap with existing areas */
	dm_list_iterate_items(per, pe_ranges) {
		if (((start < per->start) && (start + count - 1 >= per->start)) ||
		    ((start >= per->start) &&
			(per->start + per->count - 1) >= start)) {
			log_error("Overlapping PE ranges specified (" FMTu32
				  "-" FMTu32 ", " FMTu32 "-" FMTu32 ") on %s.",
				  start, start + count - 1, per->start,
				  per->start + per->count - 1, pvname);
			return 0;
		}
	}

	if (!(per = dm_pool_alloc(mem, sizeof(*per)))) {
		log_error("Allocation of list failed.");
		return 0;
	}

	per->start = start;
	per->count = count;
	dm_list_add(pe_ranges, &per->list);

	return 1;
}

static int _xstrtouint32(const char *s, char **p, int base, uint32_t *result)
{
	unsigned long ul;

	errno = 0;
	ul = strtoul(s, p, base);

	if (errno || *p == s || ul > UINT32_MAX)
		return 0;

	*result = ul;

	return 1;
}

static int _parse_pes(struct dm_pool *mem, char *c, struct dm_list *pe_ranges,
		      const char *pvname, uint32_t size)
{
	char *endptr;
	uint32_t start, end, len;

	/* Default to whole PV */
	if (!c) {
		if (!_add_pe_range(mem, pvname, pe_ranges, UINT32_C(0), size))
			return_0;
		return 1;
	}

	while (*c) {
		if (*c != ':')
			goto error;

		c++;

		/* Disallow :: and :\0 */
		if (*c == ':' || !*c)
			goto error;

		/* Default to whole range */
		start = UINT32_C(0);
		end = size - 1;

		/* Start extent given? */
		if (isdigit(*c)) {
			if (!_xstrtouint32(c, &endptr, 10, &start))
				goto error;
			c = endptr;
			/* Just one number given? */
			if (!*c || *c == ':')
				end = start;
		}
		/* Range? */
		if (*c == '-') {
			c++;
			if (isdigit(*c)) {
				if (!_xstrtouint32(c, &endptr, 10, &end))
					goto error;
				c = endptr;
			}
		} else if (*c == '+') {	/* Length? */
			c++;
			if (isdigit(*c)) {
				if (!_xstrtouint32(c, &endptr, 10, &len))
					goto error;
				c = endptr;
				end = start + (len ? (len - 1) : 0);
			}
		}

		if (*c && *c != ':')
			goto error;

		if ((start > end) || (end > size - 1)) {
			log_error("PE range error: start extent %" PRIu32 " to "
				  "end extent %" PRIu32 ".", start, end);
			return 0;
		}

		if (!_add_pe_range(mem, pvname, pe_ranges, start, end - start + 1))
			return_0;

	}

	return 1;

      error:
	log_error("Physical extent parsing error at %s.", c);
	return 0;
}

static int _create_pv_entry(struct dm_pool *mem, struct pv_list *pvl,
			     char *colon, int allocatable_only, struct dm_list *r)
{
	const char *pvname;
	struct pv_list *new_pvl = NULL, *pvl2;
	struct dm_list *pe_ranges;

	pvname = pv_dev_name(pvl->pv);
	if (allocatable_only && !(pvl->pv->status & ALLOCATABLE_PV)) {
		log_warn("WARNING: Physical volume %s not allocatable.", pvname);
		return 1;
	}

	if (allocatable_only && is_missing_pv(pvl->pv)) {
		log_warn("WARNING: Physical volume %s is missing.", pvname);
		return 1;
	}

	if (allocatable_only &&
	    (pvl->pv->pe_count == pvl->pv->pe_alloc_count)) {
		log_warn("WARNING: No free extents on physical volume \"%s\".", pvname);
		return 1;
	}

	dm_list_iterate_items(pvl2, r)
		if (pvl->pv->dev == pvl2->pv->dev) {
			new_pvl = pvl2;
			break;
		}

	if (!new_pvl) {
		if (!(new_pvl = dm_pool_alloc(mem, sizeof(*new_pvl)))) {
			log_error("Unable to allocate physical volume list.");
			return 0;
		}

		memcpy(new_pvl, pvl, sizeof(*new_pvl));

		if (!(pe_ranges = dm_pool_alloc(mem, sizeof(*pe_ranges)))) {
			log_error("Allocation of pe_ranges list failed.");
			return 0;
		}
		dm_list_init(pe_ranges);
		new_pvl->pe_ranges = pe_ranges;
		dm_list_add(r, &new_pvl->list);
	}

	/* Determine selected physical extents */
	if (!_parse_pes(mem, colon, new_pvl->pe_ranges, pv_dev_name(pvl->pv),
			pvl->pv->pe_count))
		return_0;

	return 1;
}

struct dm_list *create_pv_list(struct dm_pool *mem, struct volume_group *vg, int argc,
			    char **argv, int allocatable_only)
{
	struct dm_list *r;
	struct pv_list *pvl;
	struct dm_list tagsl, arg_pvnames;
	char *pvname = NULL;
	char *colon, *at_sign, *tagname;
	int i;

	/* Build up list of PVs */
	if (!(r = dm_pool_alloc(mem, sizeof(*r)))) {
		log_error("Allocation of list failed.");
		return NULL;
	}
	dm_list_init(r);

	dm_list_init(&tagsl);
	dm_list_init(&arg_pvnames);

	for (i = 0; i < argc; i++) {
		dm_unescape_colons_and_at_signs(argv[i], &colon, &at_sign);

		if (at_sign && (at_sign == argv[i])) {
			tagname = at_sign + 1;
			if (!validate_tag(tagname)) {
				log_error("Skipping invalid tag %s.", tagname);
				continue;
			}
			dm_list_iterate_items(pvl, &vg->pvs) {
				if (str_list_match_item(&pvl->pv->tags,
							tagname)) {
					if (!_create_pv_entry(mem, pvl, NULL,
							      allocatable_only,
							      r))
						return_NULL;
				}
			}
			continue;
		}

		pvname = argv[i];

		if (colon && !(pvname = dm_pool_strndup(mem, pvname,
					(unsigned) (colon - pvname)))) {
			log_error("Failed to clone PV name.");
			return NULL;
		}

		if (!(pvl = find_pv_in_vg(vg, pvname))) {
			log_error("Physical Volume \"%s\" not found in "
				  "Volume Group \"%s\".", pvname, vg->name);
			return NULL;
		}
		if (!_create_pv_entry(mem, pvl, colon, allocatable_only, r))
			return_NULL;
	}

	if (dm_list_empty(r))
		log_error("No specified PVs have space available.");

	return dm_list_empty(r) ? NULL : r;
}

struct dm_list *clone_pv_list(struct dm_pool *mem, struct dm_list *pvsl)
{
	struct dm_list *r;
	struct pv_list *pvl, *new_pvl;

	/* Build up list of PVs */
	if (!(r = dm_pool_alloc(mem, sizeof(*r)))) {
		log_error("Allocation of list failed.");
		return NULL;
	}
	dm_list_init(r);

	dm_list_iterate_items(pvl, pvsl) {
		if (!(new_pvl = dm_pool_zalloc(mem, sizeof(*new_pvl)))) {
			log_error("Unable to allocate physical volume list.");
			return NULL;
		}

		memcpy(new_pvl, pvl, sizeof(*new_pvl));
		dm_list_add(r, &new_pvl->list);
	}

	return r;
}