44     auto fd = open(Updater::Utils::GetPartitionRealPath(devName_).c_str(), O_RDWR);  in DoErase()  local
45     if (fd < 0) {  in DoErase()
50     uint64_t size = GetBlockDeviceSize(fd);  in DoErase()
52     if (ioctl(fd, BLKSECDISCARD, &range) >= 0) {  in DoErase()
53         close(fd);  in DoErase()
59     if (ioctl(fd, BLKDISCARD, &range) < 0) {  in DoErase()
60         close(fd);  in DoErase()
65     if (!Updater::Utils::WriteFully(fd, buffer.data(), buffer.size())) {  in DoErase()
66         close(fd);  in DoErase()
70     fsync(fd);  in DoErase()
71     close(fd);  in DoErase()
91 uint64_t Partition::GetBlockDeviceSize(int fd) const  in GetBlockDeviceSize()
94     return (ioctl(fd, BLKGETSIZE64, &size) == 0) ? size : 0;  in GetBlockDeviceSize()