int mmc_trim(int fd, off_t offset, off_t count)
{
uint64_t range[2] = {offset, offset + count};
if (ioctl(fd, BLKDISCARD, &range))
fwup_warnx("BLKDISCARD (TRIM command) failed on range %"PRIu64" to %"PRIu64" (ignoring)", range[0], range[1]);
return 0;
}
static dev_t root_disk_device()
{
// NOTE: We'd like to know the root device for the root directory, but stat
// only returns the partition device for the root directory. Since it
// is often the case of 16 minor devices to support each real device,
// assume that if we mask the root directory's device off that we'll
// get its parent.
struct stat rootdev;
if (stat("/", &rootdev) >= 0) {
return (rootdev.st_dev & 0xfff0);
} else {
fwup_warnx("can't stat root directory");
return 0;
}
}
int mmc_eject(const char *mmc_device)
{
DADiskRef disk = mmc_device_to_diskref(mmc_device);
int rc = -1;
if (disk) {
struct disk_op_context context;
context.operation = "eject";
DADiskEject(disk, kDADiskEjectOptionDefault, disk_op_done_cb, &context);
if (run_loop_for_time(10) < 0)
fwup_warnx("unmount timed out");
if (context.succeeded)
rc = 0;
CFRelease(disk);
}
return rc;
}
int mmc_umount_all(const char *mmc_device)
{
DADiskRef disk = mmc_device_to_diskref(mmc_device);
int rc = -1;
if (disk) {
struct disk_op_context context;
context.operation = "unmount";
DADiskUnmount(disk, kDADiskUnmountOptionWhole, disk_op_done_cb, &context);
// Wait for a while since unmounting sometimes takes time.
if (run_loop_for_time(10) < 0)
fwup_warnx("unmount timed out");
if (context.succeeded)
rc = 0;
CFRelease(disk);
}
return rc;
}
static void disk_op_done_cb(DADiskRef disk, DADissenterRef dissenter, void *c)
{
(void) disk;
struct disk_op_context *context = (struct disk_op_context *) c;
if (dissenter) {
CFStringRef what = DADissenterGetStatusString(dissenter);
fwup_warnx("%s failed: 0x%x (%d) %s)",
context->operation,
DADissenterGetStatus(dissenter),
DADissenterGetStatus(dissenter),
CFStringGetCStringPtr(what, kCFStringEncodingMacRoman));
context->succeeded = false;
} else {
context->succeeded = true;
}
CFRunLoopStop(CFRunLoopGetCurrent());
}
int mmc_umount_all(const char *mmc_device)
{
FILE *fp = fopen("/proc/mounts", "r");
if (!fp)
fwup_err(EXIT_FAILURE, "/proc/mounts");
char *todo[64] = {0};
int todo_ix = 0;
int ultimate_rc = 0;
char line[FWUP_BLOCK_SIZE] = {0};
while (!feof(fp) &&
fgets(line, sizeof(line), fp)) {
char devname[64];
char mountpoint[256];
if (sscanf(line, "%63s %255s", devname, mountpoint) != 2)
continue;
if (strstr(devname, mmc_device) == devname) {
// mmc_device is a prefix of this device, i.e. mmc_device is /dev/sdc
// and /dev/sdc1 is mounted.
if (todo_ix == NUM_ELEMENTS(todo))
fwup_errx(EXIT_FAILURE, "Device mounted too many times");
// strings from /proc/mounts are escaped, so unescape them
todo[todo_ix++] = unescape_string(mountpoint);
}
}
fclose(fp);
int mtab_exists = (access("/etc/mtab", F_OK) != -1);
for (int i = 0; i < todo_ix; i++) {
if (mtab_exists) {
// If /etc/mtab, then call umount(8) so that
// gets updated correctly.
int rc = fork_exec("/bin/umount", todo[i]);
if (rc != 0) {
fwup_warnx("Error calling umount on '%s'", todo[i]);
ultimate_rc = -1;
}
} else {
// No /etc/mtab, so call the kernel directly.
#if HAS_UMOUNT
if (umount(todo[i]) < 0) {
fwup_warnx("umount %s", todo[i]);
ultimate_rc = -1;
}
#else
// If no umount on this platform, warn, but don't
// return failure.
fwup_warnx("umount %s: not supported", todo[i]);
#endif
}
}
for (int i = 0; i < todo_ix; i++)
free(todo[i]);
return ultimate_rc;
}