#include "fdiskP.h"
struct fdisk_context *fdisk_new_context(void)
{
struct fdisk_context *cxt;
cxt = calloc(1, sizeof(*cxt));
if (!cxt)
return NULL;
DBG(LABEL, dbgprint("new context %p allocated", cxt));
cxt->dev_fd = -1;
/*
* Allocate label specific structs.
*
* This is necessary (for example) to store label specific
* context setting.
*/
cxt->labels[ cxt->nlabels++ ] = fdisk_new_gpt_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_dos_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_aix_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_bsd_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_mac_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_sgi_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_sun_label(cxt);
return cxt;
}
/*
* Returns the current label if no name specified.
*/
struct fdisk_label *fdisk_context_get_label(struct fdisk_context *cxt, const char *name)
{
size_t i;
assert(cxt);
if (!name)
return cxt->label;
for (i = 0; i < cxt->nlabels; i++)
if (strcmp(cxt->labels[i]->name, name) == 0)
return cxt->labels[i];
DBG(LABEL, dbgprint("failed to found %s label driver\n", name));
return NULL;
}
int __fdisk_context_switch_label(struct fdisk_context *cxt,
struct fdisk_label *lb)
{
if (!lb)
return -EINVAL;
cxt->label = lb;
DBG(LABEL, dbgprint("--> switching context to %s!", lb->name));
return 0;
}
int fdisk_context_switch_label(struct fdisk_context *cxt, const char *name)
{
return __fdisk_context_switch_label(cxt,
fdisk_context_get_label(cxt, name));
}
static void reset_context(struct fdisk_context *cxt)
{
size_t i;
DBG(CONTEXT, dbgprint("\n-----\nresetting context %p", cxt));
/* reset drives' private data */
for (i = 0; i < cxt->nlabels; i++)
fdisk_deinit_label(cxt->labels[i]);
/* free device specific stuff */
if (cxt->dev_fd > -1)
close(cxt->dev_fd);
free(cxt->dev_path);
free(cxt->firstsector);
/* initialize */
cxt->dev_fd = -1;
cxt->dev_path = NULL;
cxt->firstsector = NULL;
cxt->io_size = 0;
cxt->optimal_io_size = 0;
cxt->min_io_size = 0;
cxt->phy_sector_size = 0;
cxt->sector_size = 0;
cxt->alignment_offset = 0;
cxt->grain = 0;
cxt->first_lba = 0;
cxt->total_sectors = 0;
memset(&cxt->geom, 0, sizeof(struct fdisk_geometry));
cxt->label = NULL;
}
/**
* fdisk_context_assign_device:
* @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: 0 on sucess, < 0 on error.
*/
int fdisk_context_assign_device(struct fdisk_context *cxt,
const char *fname, int readonly)
{
int fd;
DBG(CONTEXT, dbgprint("assigning device %s", fname));
assert(cxt);
reset_context(cxt);
if (readonly == 1 || (fd = open(fname, O_RDWR)) < 0) {
if ((fd = open(fname, O_RDONLY)) < 0)
return -errno;
readonly = 1;
}
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 */
fdisk_probe_labels(cxt);
fdisk_reset_alignment(cxt);
DBG(CONTEXT, dbgprint("context %p initialized for %s [%s]",
cxt, fname,
readonly ? "READ-ONLY" : "READ-WRITE"));
return 0;
fail:
DBG(CONTEXT, dbgprint("failed to assign device"));
return -errno;
}
/**
* fdisk_free_context:
* @cxt: fdisk context
*
* Deallocates context struct.
*/
void fdisk_free_context(struct fdisk_context *cxt)
{
int i;
if (!cxt)
return;
DBG(CONTEXT, dbgprint("freeing context %p for %s", cxt, cxt->dev_path));
reset_context(cxt);
/* deallocate label's private stuff */
for (i = 0; i < cxt->nlabels; i++) {
if (!cxt->labels[i])
continue;
if (cxt->labels[i]->op->free)
cxt->labels[i]->op->free(cxt->labels[i]);
else
free(cxt->labels[i]);
}
free(cxt);
}
/**
* fdisk_context_set_ask:
* @cxt: context
* @ask_cb: callback
* @data: callback data
*
* Returns: 0 on sucess, < 0 on error.
*/
int fdisk_context_set_ask(struct fdisk_context *cxt,
int (*ask_cb)(struct fdisk_context *, struct fdisk_ask *, void *),
void *data)
{
assert(cxt);
cxt->ask_cb = ask_cb;
cxt->ask_data = data;
return 0;
}
/*
* @str: "cylinder" or "sector".
*
* This is pure shit, unfortunately for example Sun addresses begin of the
* partition by cylinders...
*/
int fdisk_context_set_unit(struct fdisk_context *cxt, const char *str)
{
assert(cxt);
cxt->display_in_cyl_units = 0;
if (!str)
return 0;
if (strcmp(str, "cylinder") == 0 || strcmp(str, "cylinders") == 0)
cxt->display_in_cyl_units = 1;
else if (strcmp(str, "sector") == 0 || strcmp(str, "sectors") == 0)
cxt->display_in_cyl_units = 0;
DBG(CONTEXT, dbgprint("display unit: %s", fdisk_context_get_unit(cxt, 0)));
return 0;
}
const char *fdisk_context_get_unit(struct fdisk_context *cxt, int n)
{
assert(cxt);
if (fdisk_context_use_cylinders(cxt))
return P_("cylinder", "cylinders", n);
return P_("sector", "sectors", n);
}
/* Returns 1 if user wants to display in cylinders. */
int fdisk_context_use_cylinders(struct fdisk_context *cxt)
{
assert(cxt);
return cxt->display_in_cyl_units == 1;
}
/* Returns number of "units" per sector, default is 1 if display unit is sector.
*/
unsigned int fdisk_context_get_units_per_sector(struct fdisk_context *cxt)
{
assert(cxt);
if (fdisk_context_use_cylinders(cxt)) {
assert(cxt->geom.heads);
return cxt->geom.heads * cxt->geom.sectors;
}
return 1;
}