/**
* 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 success, < 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|O_CLOEXEC)) < 0) {
if ((fd = open(fname, O_RDONLY|O_CLOEXEC)) < 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);
/* let's apply user geometry *after* label prober
* to make it possible to override in-label setting */
fdisk_apply_user_device_properties(cxt);
/* warn about obsolete stuff on the device if we aren't in
* list-only mode and there is not PT yet */
if (!fdisk_context_listonly(cxt) && !fdisk_dev_has_disklabel(cxt))
warn_wipe(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_assign_device:
* @cxt: context
* @fname: path to the device to be handled
* @readonly: how to open the device
*
* Open the device, discovery topology, geometry, detect disklabel and switch
* the current label driver to reflect the probing result.
*
* Note that this function resets all generic setting in context. If the @cxt
* is nested context then the device is assigned to the parental context and
* necessary properties are copied to the @cxt. The change is propagated in
* child->parent direction only. It's impossible to use a different device for
* primary and nested contexts.
*
* Returns: 0 on success, < 0 on error.
*/
int fdisk_assign_device(struct fdisk_context *cxt,
const char *fname, int readonly)
{
int fd;
DBG(CXT, ul_debugobj(cxt, "assigning device %s", fname));
assert(cxt);
/* redirect request to parent */
if (cxt->parent) {
int rc, org = fdisk_is_listonly(cxt->parent);
/* assign_device() is sensitive to "listonly" mode, so let's
* follow the current context setting for the parent to avoid
* unwanted extra warnings. */
fdisk_enable_listonly(cxt->parent, fdisk_is_listonly(cxt));
rc = fdisk_assign_device(cxt->parent, fname, readonly);
fdisk_enable_listonly(cxt->parent, org);
if (!rc)
rc = init_nested_from_parent(cxt, 0);
if (!rc)
fdisk_probe_labels(cxt);
return rc;
}
reset_context(cxt);
fd = open(fname, (readonly ? O_RDONLY : O_RDWR ) | O_CLOEXEC);
if (fd < 0)
return -errno;
cxt->readonly = readonly;
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);
/* let's apply user geometry *after* label prober
* to make it possible to override in-label setting */
fdisk_apply_user_device_properties(cxt);
/* warn about obsolete stuff on the device if we aren't in
* list-only mode and there is not PT yet */
if (!fdisk_is_listonly(cxt) && !fdisk_has_label(cxt))
warn_wipe(cxt);
DBG(CXT, ul_debugobj(cxt, "initialized for %s [%s]",
fname, readonly ? "READ-ONLY" : "READ-WRITE"));
return 0;
fail:
DBG(CXT, ul_debugobj(cxt, "failed to assign device"));
return -errno;
}
