如何让 Linux 在不弹出 CDROM 的情况下更新它对 CDROM 大小的想法？换句话说，如何在不先弹出的情况下安装刚刻录的 CDROM？
我正在对 CDROM 进行无人值守的增量备份。每天 my script 使用“wodim -msinfo”和“genisoimage -C”生成一个图像，并使用“wodim -multi”附加到 CDROM。我的脚本然后挂载 CDROM 以检查新文件是否正确附加。只有在挂载前更新了 Linux 对 CDROM 大小的想法，该脚本才能读取新文件。大小在/sys/block/sr2/size 和/proc/partitions 中。以前我的脚本使用“eject”然后“eject -t”来让 Linux 重新读取 CDROM。 “eject -t”不适用于我的新 CDROM 刻录机。如何在不弹出 CDROM 的情况下更新/proc/partitions？
看来“wodim -msinfo”和“genisoimage -C”步骤还要求CDROM自上次刻录到CDROM后已经弹出，否则我会收到消息“genisoimage:无效参数。在旧图像上寻找错误”。
有人在 2003 年问过这个问题，但他们收到的答案并没有为我更新 CDROM 大小。 http://compgroups.net/comp.os.linux.questions/rescan-cdrom-frm-command-line/456190
#include <fcntl.h>
#include <stdio.h>
#include <linux/cdrom.h>
int main(void)
{
int i = 0;
int fd = open("/dev/cdrom", O_RDWR);
if (fd == -1)
{
perror("Could not open cdrom");
return 1;
}
if (ioctl(fd, CDROM_MEDIA_CHANGED)) perror("ioctl");
if (ioctl(fd, CDROMRESET)) perror("ioctl CDROMRESET");
if (ioctl(fd, CDROM_NEXT_WRITABLE, &i))
perror("ioctl CDROM_NEXT_WRITABLE,");
else
printf("CDROM_NEXT_WRITABLE %d\n", i);
if (ioctl(fd, CDROM_LAST_WRITTEN, &i))
perror("ioctl CDROM_LAST_WRITTEN,");
else
printf("CDROM_LAST_WRITTEN %d\n", i);
return 0;
}
这正是我创建新 CDROM 时发生的情况。我必须弹出它，然后将其推回以使其安装。
% genisoimage -r -V archive -input-charset ASCII -quiet /usr/lib/vlc > /tmp/libvlc.iso
% grep -H sr2 /proc/partitions ; cat /sys/block/sr2/size
/proc/partitions: 11 2 2 sr2
4
% wodim driveropts=burnfree -tao -data dev=/dev/sr2 /tmp/libvlc.iso
wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
Device type : Removable CD-ROM
Version : 0
Response Format: 2
Capabilities :
Vendor_info : 'TSSTcorp'
Identification : 'CDDVDW SE-S084C '
Revision : 'TU00'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Using generic SCSI-3/mmc CD-R/CD-RW driver (mmc_cdr).
Driver flags : MMC-3 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Speed set to 1764 KB/s
Starting to write CD/DVD at speed 10.0 in real TAO mode for single session.
Last chance to quit, starting real write in 0 seconds. Operation starts.
Track 01: Total bytes read/written: 17078272/17078272 (8339 sectors).
% grep -H sr2 /proc/partitions ; cat /sys/block/sr2/size
/proc/partitions: 11 2 2 sr2
4
% sudo mount /dev/sr2 /mnt
mount: /dev/sr2 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr2,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
% grep -H sr2 /proc/partitions ; cat /sys/block/sr2/size
/proc/partitions: 11 2 2 sr2
4
% sudo mount /dev/sr2 /mnt
mount: /dev/sr2 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr2,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
% sudo eject /dev/sr2
% #push CDRW back in
% grep -H sr2 /proc/partitions ; cat /sys/block/sr2/size
/proc/partitions: 11 2 16682 sr2
33364
% sudo mount /dev/sr2 /mnt
mount: /dev/sr2 is write-protected, mounting read-only
我尝试了各种 hdparm 选项，但它们都不起作用，它们也没有改变内核对 CDROM 大小的想法或允许安装它。
:; sudo hdparm -z /dev/sr2
/dev/sr2:
re-reading partition table
BLKRRPART failed: Invalid argument
:; sudo hdparm -F /dev/sr2
/dev/sr2:
SG_IO: bad/missing sense data, sb[]: 70 00 05 00 00 00 00 0a 00 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SG_IO: bad/missing sense data, sb[]: 70 00 05 00 00 00 00 0a 00 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
:; sudo hdparm -Y /dev/sr2
/dev/sr2:
issuing sleep command
SG_IO: bad/missing sense data, sb[]: 70 00 05 00 00 00 00 0a 00 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
:; sudo hdparm -w /dev/sr2
/dev/sr2:
resetting drive
HDIO_DRIVE_RESET failed: Invalid argument
:; grep -H sr2 /proc/partitions ; cat /sys/block/sr2/size
/proc/partitions: 11 2 2 sr2
4
:; sudo mount /dev/sr2 /mnt
mount: /dev/sr2 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr2,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
指定文件系统的类型没有帮助。
:; grep -H sr2 /proc/partitions ; cat /sys/block/sr2/size
/proc/partitions: 11 2 2 sr2
4
:; sudo mount -t iso9660 /dev/sr2 /mnt
[sudo] password for root:
(pam_mount.c:365): pam_mount 2.14: entering auth stage
mount: /dev/sr2 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr2,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
(pam_mount.c:133): clean system authtok=0x7f0a33b97450 (1073741824)
:; grep -H sr2 /proc/partitions ; cat /sys/block/sr2/size
/proc/partitions: 11 2 2 sr2
4
我从 dmesg(1) 得到的消息是
[1209552.092616] isofs_fill_super: bread failed, dev=sr2, iso_blknum=16, block=16
最佳答案
我在 BD 驱动器上遇到了同样的问题。对我有用的是解除绑定(bind)(解除电源)设备并再次重新绑定(bind)。这里的粗略步骤
[11:0:0:0] cd/dvd TSSTcorp BDDVDW SE-506AB TS01 /dev/sr1
dir: /sys/bus/scsi/devices/11:0:0:0 [/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/host11/target11:0:0/11:0:0:0]
sudo bash -c "echo 2-1.2 | tee /sys/bus/usb/drivers/usb/unbind"
sudo bash -c "echo 2-1.2 | tee /sys/bus/usb/drivers/usb/bind"
解除绑定(bind)/绑定(bind)是重置许多 USB 设备的好方法...
关于linux - 如何在不弹出 CDROM 的情况下在 Linux 中更新 CDROM 大小？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/28517124/