/*
* Copyright (C) 2012 Davidlohr Bueso <dave@gnu.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU 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 <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#ifdef HAVE_LIBBLKID
#include <blkid.h>
#endif
#include "nls.h"
#include "blkdev.h"
#include "common.h"
#include "fdisk.h"
#include "fdiskdoslabel.h"
#include "fdisksunlabel.h"
int fdisk_debug_mask;
/*
* Label probing functions.
*/
static const struct fdisk_label *labels[] =
{
&gpt_label,
&dos_label,
&sun_label,
&sgi_label,
&aix_label,
&bsd_label,
&mac_label,
};
static int __probe_labels(struct fdisk_context *cxt)
{
size_t i;
cxt->disklabel = FDISK_DISKLABEL_ANY;
for (i = 0; i < ARRAY_SIZE(labels); i++) {
if (!labels[i]->probe || labels[i]->probe(cxt) != 1)
continue;
cxt->label = labels[i];
DBG(LABEL, dbgprint("detected a %s label", cxt->label->name));
return 0;
}
return 1; /* not found */
}
/**
* fdisk_create_disklabel:
* @cxt: fdisk context
* @name: label name
*
* Creates a new disk label of type @name. If @name is NULL, then it
* will create a default system label type, either SUN or DOS.
*
* Returns 0 on success, otherwise, a corresponding error.
*/
int fdisk_create_disklabel(struct fdisk_context *cxt, const char *name)
{
if (!cxt)
return -EINVAL;
cxt->label = NULL;
if (!name) { /* use default label creation */
#ifdef __sparc__
cxt->label = &sun_label;
#else
cxt->label = &dos_label;
#endif
} else {
size_t i;
for (i = 0; i < ARRAY_SIZE(labels); i++) {
if (strcmp(name, labels[i]->name) != 0)
continue;
cxt->label = labels[i];
DBG(LABEL, dbgprint("changing to %s label\n", cxt->label->name));
break;
}
}
if (!cxt->label)
return -EINVAL;
if (!cxt->label->create)
return -ENOSYS;
fdisk_reset_alignment(cxt);
return cxt->label->create(cxt);
}
/**
* fdisk_new_context:
* @fname: path to the device to be handled
* @readonly: how to open the device
*
* If the @readonly flag is set to false, fdisk will attempt to open
* the device with read-write mode and will fallback to read-only if
* unsuccessful.
*
* Returns: newly allocated fdisk context or NULL upon failure.
*/
struct fdisk_context *fdisk_new_context_from_filename(const char *fname, int readonly)
{
int fd, errsv = 0;
struct fdisk_context *cxt = NULL;
DBG(CONTEXT, dbgprint("initializing context for %s", fname));
if (readonly == 1 || (fd = open(fname, O_RDWR)) < 0) {
if ((fd = open(fname, O_RDONLY)) < 0)
return NULL;
readonly = 1;
}
cxt = calloc(1, sizeof(*cxt));
if (!cxt)
goto fail;
cxt->dev_fd = fd;
cxt->dev_path = strdup(fname);
if (!cxt->dev_path)
goto fail;
fdisk_discover_topology(cxt);
fdisk_discover_geometry(cxt);
if (fdisk_read_firstsector(cxt) < 0)
goto fail;
/* detect labels and apply labes specific stuff (e.g geomery)
* to the context */
__probe_labels(cxt);
fdisk_reset_alignment(cxt);
DBG(CONTEXT, dbgprint("context %p initialized for %s [%s]",
cxt, fname,
readonly ? "READ-ONLY" : "READ-WRITE"));
return cxt;
fail:
errsv = errno;
fdisk_free_context(cxt);
errno = errsv;
DBG(CONTEXT, dbgprint("failed to initialize context for %s: %m", fname));
return NULL;
}
/**
* fdisk_free_context:
* @cxt: fdisk context
*
* Deallocates context struct.
*/
void fdisk_free_context(struct fdisk_context *cxt)
{
if (!cxt)
return;
DBG(CONTEXT, dbgprint("freeing context %p for %s", cxt, cxt->dev_path));
close(cxt->dev_fd);
free(cxt->dev_path);
free(cxt->firstsector);
free(cxt);
}