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_bsd_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_sgi_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_sun_label(cxt);
return cxt;
}
/**
* fdisk_new_context:
*
* Returns: newly allocated libfdisk handler
*/
struct fdisk_context *fdisk_new_context(void)
{
struct fdisk_context *cxt;
cxt = calloc(1, sizeof(*cxt));
if (!cxt)
return NULL;
DBG(CXT, ul_debugobj(cxt, "alloc"));
cxt->dev_fd = -1;
cxt->refcount = 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_bsd_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_sgi_label(cxt);
cxt->labels[ cxt->nlabels++ ] = fdisk_new_sun_label(cxt);
return cxt;
}
/**
* fdisk_new_nested_context:
* @parent: parental context
* @name: optional label name (e.g. "bsd")
*
* This is supported for MBR+BSD and GPT+pMBR only.
*
* Returns: new context for nested partiton table.
*/
struct fdisk_context *fdisk_new_nested_context(struct fdisk_context *parent,
const char *name)
{
struct fdisk_context *cxt;
struct fdisk_label *lb = NULL;
assert(parent);
cxt = calloc(1, sizeof(*cxt));
if (!cxt)
return NULL;
DBG(CXT, ul_debugobj(parent, "alloc nested [%p]", cxt));
cxt->dev_fd = parent->dev_fd;
cxt->refcount = 1;
cxt->parent = parent;
cxt->io_size = parent->io_size;
cxt->optimal_io_size = parent->optimal_io_size;
cxt->min_io_size = parent->min_io_size;
cxt->phy_sector_size = parent->phy_sector_size;
cxt->sector_size = parent->sector_size;
cxt->alignment_offset = parent->alignment_offset;
cxt->grain = parent->grain;
cxt->first_lba = parent->first_lba;
cxt->total_sectors = parent->total_sectors;
cxt->firstsector = parent->firstsector;
cxt->ask_cb = parent->ask_cb;
cxt->ask_data = parent->ask_data;
cxt->geom = parent->geom;
if (name) {
if (strcmp(name, "bsd") == 0)
lb = cxt->labels[ cxt->nlabels++ ] = fdisk_new_bsd_label(cxt);
else if (strcmp(name, "dos") == 0)
lb = cxt->labels[ cxt->nlabels++ ] = fdisk_new_dos_label(cxt);
}
if (lb) {
DBG(CXT, ul_debugobj(cxt, "probing for nested %s", lb->name));
cxt->label = lb;
if (lb->op->probe(cxt) == 1)
__fdisk_switch_label(cxt, lb);
else {
DBG(CXT, ul_debugobj(cxt, "not found %s label", lb->name));
if (lb->op->deinit)
lb->op->deinit(lb);
cxt->label = NULL;
}
}
return cxt;
}
/**
* fdisk_new_nested_context:
* @parent: parental context
* @name: optional label name (e.g. "bsd")
*
* Create a new nested fdisk context for nested disk labels (e.g. BSD or PMBR).
* The function also probes for the nested label on the device if device is
* already assigned to parent.
*
* The new context is initialized according to @parent and both context shares
* some settings and file descriptor to the device. The child propagate some
* changes (like fdisk_assign_device()) to parent, but it does not work
* vice-versa. The behavior is undefined if you assign another device to
* parent.
*
* Returns: new context for nested partition table.
*/
struct fdisk_context *fdisk_new_nested_context(struct fdisk_context *parent,
const char *name)
{
struct fdisk_context *cxt;
struct fdisk_label *lb = NULL;
assert(parent);
cxt = calloc(1, sizeof(*cxt));
if (!cxt)
return NULL;
DBG(CXT, ul_debugobj(parent, "alloc nested [%p] [name=%s]", cxt, name));
cxt->refcount = 1;
fdisk_ref_context(parent);
cxt->parent = parent;
if (init_nested_from_parent(cxt, 1) != 0) {
cxt->parent = NULL;
fdisk_unref_context(cxt);
return NULL;
}
if (name) {
if (strcasecmp(name, "bsd") == 0)
lb = cxt->labels[ cxt->nlabels++ ] = fdisk_new_bsd_label(cxt);
else if (strcasecmp(name, "dos") == 0 || strcasecmp(name, "mbr") == 0)
lb = cxt->labels[ cxt->nlabels++ ] = fdisk_new_dos_label(cxt);
}
if (lb && parent->dev_fd >= 0) {
DBG(CXT, ul_debugobj(cxt, "probing for nested %s", lb->name));
cxt->label = lb;
if (lb->op->probe(cxt) == 1)
__fdisk_switch_label(cxt, lb);
else {
DBG(CXT, ul_debugobj(cxt, "not found %s label", lb->name));
if (lb->op->deinit)
lb->op->deinit(lb);
cxt->label = NULL;
}
}
return cxt;
}
