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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <linux/dm-ioctl.h>
#include <sys/ioctl.h>
#include "dm-util.h"
#include "fd-util.h"
#include "string-util.h"
int dm_deferred_remove_cancel(const char *name) {
_cleanup_close_ int fd = -EBADF;
struct combined {
struct dm_ioctl dm_ioctl;
struct dm_target_msg dm_target_msg;
} _packed_;
union message {
struct combined combined;
struct {
uint8_t space[offsetof(struct combined, dm_target_msg.message)];
char text[STRLEN("@cancel_deferred_remove") + 1];
} _packed_;
} message = {
.combined.dm_ioctl = {
.version = {
DM_VERSION_MAJOR,
DM_VERSION_MINOR,
DM_VERSION_PATCHLEVEL
},
.data_size = sizeof(union message),
.data_start = offsetof(union message, combined.dm_target_msg),
},
};
assert(name);
if (strlen(name) >= sizeof(message.combined.dm_ioctl.name))
return -ENODEV; /* A device with a name longer than this cannot possibly exist */
strncpy_exact(message.combined.dm_ioctl.name, name, sizeof(message.combined.dm_ioctl.name));
strncpy_exact(message.text, "@cancel_deferred_remove", sizeof(message.text));
fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
if (fd < 0)
return -errno;
if (ioctl(fd, DM_TARGET_MSG, &message))
return -errno;
return 0;
}
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