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lvm2/lib/misc/lvm-string.c
Zdenek Kabelac 460d0254eb thin: add pool metadata spare lv support
Add support for pool's metadata spare volume.
2013-07-18 18:22:43 +02:00

155 lines
3.2 KiB
C

/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "lvm-string.h"
#include <ctype.h>
int emit_to_buffer(char **buffer, size_t *size, const char *fmt, ...)
{
int n;
va_list ap;
va_start(ap, fmt);
n = vsnprintf(*buffer, *size, fmt, ap);
va_end(ap);
/*
* Revert to old glibc behaviour (version <= 2.0.6) where snprintf
* returned -1 if buffer was too small. From glibc 2.1 it returns number
* of chars that would have been written had there been room.
*/
if (n < 0 || ((unsigned) n + 1 > *size))
n = -1;
if (n < 0 || ((size_t)n == *size))
return 0;
*buffer += n;
*size -= n;
return 1;
}
/*
* A-Za-z0-9._-+/=!:&#
*/
int validate_tag(const char *n)
{
register char c;
/* int len = 0; */
if (!n || !*n)
return 0;
/* FIXME: Is unlimited tag size support needed ? */
while ((/* len++, */ c = *n++))
if (!isalnum(c) && c != '.' && c != '_' && c != '-' && c != '+' && c != '/'
&& c != '=' && c != '!' && c != ':' && c != '&' && c != '#')
return 0;
return 1;
}
/*
* Device layer names are all of the form <vg>-<lv>-<layer>, any
* other hyphens that appear in these names are quoted with yet
* another hyphen. The top layer of any device has no layer
* name. eg, vg0-lvol0.
*/
int validate_name(const char *n)
{
register char c;
register int len = 0;
if (!n || !*n)
return 0;
/* Hyphen used as VG-LV separator - ambiguity if LV starts with it */
if (*n == '-')
return 0;
if ((*n == '.') && (!n[1] || (n[1] == '.' && !n[2]))) /* ".", ".." */
return 0;
while ((len++, c = *n++))
if (!isalnum(c) && c != '.' && c != '_' && c != '-' && c != '+')
return 0;
if (len > NAME_LEN)
return 0;
return 1;
}
int apply_lvname_restrictions(const char *name)
{
static const char * const _reserved_prefixes[] = {
"snapshot",
"pvmove",
NULL
};
static const char * const _reserved_strings[] = {
"_mlog",
"_mimage",
"_pmspare",
"_rimage",
"_rmeta",
"_vorigin",
"_tdata",
"_tmeta",
NULL
};
unsigned i;
const char *s;
for (i = 0; (s = _reserved_prefixes[i]); i++) {
if (!strncmp(name, s, strlen(s))) {
log_error("Names starting \"%s\" are reserved. "
"Please choose a different LV name.", s);
return 0;
}
}
for (i = 0; (s = _reserved_strings[i]); i++) {
if (strstr(name, s)) {
log_error("Names including \"%s\" are reserved. "
"Please choose a different LV name.", s);
return 0;
}
}
return 1;
}
int is_reserved_lvname(const char *name)
{
int rc, old_suppress;
old_suppress = log_suppress(2);
rc = !apply_lvname_restrictions(name);
log_suppress(old_suppress);
return rc;
}
char *build_dm_uuid(struct dm_pool *mem, const char *lvid,
const char *layer)
{
return dm_build_dm_uuid(mem, UUID_PREFIX, lvid, layer);
}