[Comm] Как ядро заставить пересчитать устройство?

[Kharitonov A. Dmitry]

Требуется получить получить адекватный UUID

Вставляю SD карту
$ dmesg | tail
[  289.425392] sd 4:0:0:0: [sde] Mode Sense: 03 00 00 00
[  289.426736] sd 4:0:0:0: [sde] No Caching mode page present
[  289.426757] sd 4:0:0:0: [sde] Assuming drive cache: write through
[  289.436518] sd 4:0:0:0: [sde] No Caching mode page present
[  289.436536] sd 4:0:0:0: [sde] Assuming drive cache: write through
[  289.439109]  sde: sde1 sde2 < sde5 >
[  289.444068] sd 4:0:0:0: [sde] No Caching mode page present
[  289.444092] sd 4:0:0:0: [sde] Assuming drive cache: write through
[  289.444114] sd 4:0:0:0: [sde] Attached SCSI removable disk
[  290.576258] FAT-fs (sde1): utf8 is not a recommended IO charset for 
FAT filesystems, filesystem will be case sensitive!
$ sudo fdisk -l /dev/sde

Disk /dev/sde: 32.3 GB, 32295092224 bytes, 63076352 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x001105d9

    Device Boot      Start         End      Blocks   Id  System
/dev/sde1            2048     6293503     3145728    c  W95 FAT32 (LBA)
/dev/sde2         6293504    63076351    28391424    f  W95 Ext'd (LBA)
/dev/sde5         6295552    63076351    28390400    b  W95 FAT32
$ sudo blkid | grep /dev/sde
/dev/sde1: LABEL="tr" UUID="C725-949A" TYPE="vfat"
/dev/sde5: LABEL="tr2" UUID="C885-03E6" TYPE="vfat"

Внимательно смотрим на UUID="C725-949A"
Это всё правильно. Теперь мне нужно переформатировать в ntfs

$ sudo umount /dev/sde1
$ sudo umount /dev/sde1
umount: /dev/sde1: not mounted
$ sudo umount /dev/sde5
umount: /dev/sde5: not mounted
$ sudo dd if=/dev/zero of=/dev/sde count=8k bs=4096
8192+0 records in
8192+0 records out
33554432 bytes (34 MB) copied, 2.94593 s, 11.4 MB/s
$ echo -ne "u\nc\nn\np\n\n\n\nt\n7\na\n1\nw\n" | sudo fdisk -S56 /dev/sde
Welcome to fdisk (util-linux 2.22.1).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x218d0787.

Command (m for help): Changing display/entry units to cylinders 
(DEPRECATED!)

Command (m for help): DOS Compatibility flag is set (DEPRECATED!)

Command (m for help): Partition type:
    p   primary (0 primary, 0 extended, 4 free)
    e   extended
Select (default p): Partition number (1-4, default 1): Using default value 1
First cylinder (1-17599, default 1): Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-17599, default 17599): 
Using default value 17599
Partition 1 of type Linux and of size 30.1 GiB is set

Command (m for help): Selected partition 1
Hex code (type L to list codes): Changed system type of partition 1 to 7 
(HPFS/NTFS/exFAT)

Command (m for help): Partition number (1-4):
Command (m for help): The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
$ sudo fdisk -l /dev/sde

Disk /dev/sde: 32.3 GB, 32295092224 bytes, 63076352 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x218d0787

    Device Boot      Start         End      Blocks   Id  System
/dev/sde1   *          56    63074815    31537380    7 HPFS/NTFS/exFAT
$ sudo mkfs.ntfs -f -c 4096 -L test /dev/sde1
Creating NTFS volume structures.
mkntfs completed successfully. Have a nice day.

А теперь внимание

$ sudo blkid | grep /dev/sde
/dev/sde1: LABEL="tr" UUID="C725-949A" TYPE="vfat"

UUID не изменился!!!

$ sudo partprobe
$ sudo blkid | grep /dev/sde
/dev/sde1: LABEL="tr" UUID="C725-949A" TYPE="vfat"

вынимаю и вставляю

$ dmesg | tail
[  918.870892] sd 5:0:0:0: [sde] Write Protect is off
[  918.870910] sd 5:0:0:0: [sde] Mode Sense: 03 00 00 00
[  918.872078] sd 5:0:0:0: [sde] No Caching mode page present
[  918.872093] sd 5:0:0:0: [sde] Assuming drive cache: write through
[  918.877223] sd 5:0:0:0: [sde] No Caching mode page present
[  918.877233] sd 5:0:0:0: [sde] Assuming drive cache: write through
[  918.878631]  sde: sde1
[  918.882372] sd 5:0:0:0: [sde] No Caching mode page present
[  918.882382] sd 5:0:0:0: [sde] Assuming drive cache: write through
[  918.882390] sd 5:0:0:0: [sde] Attached SCSI removable disk
$ sudo blkid | grep /dev/sde
/dev/sde1: LABEL="tr" UUID="C725-949A" TYPE="vfat"


После перезагрузки

$ dmesg | tail
[  139.522377] sd 4:0:0:0: [sde] Mode Sense: 03 00 00 00
[  139.523479] sd 4:0:0:0: [sde] No Caching mode page present
[  139.523495] sd 4:0:0:0: [sde] Assuming drive cache: write through
[  139.531353] sd 4:0:0:0: [sde] No Caching mode page present
[  139.531369] sd 4:0:0:0: [sde] Assuming drive cache: write through
[  139.532754]  sde: sde1
[  139.536356] sd 4:0:0:0: [sde] No Caching mode page present
[  139.536369] sd 4:0:0:0: [sde] Assuming drive cache: write through
[  139.536381] sd 4:0:0:0: [sde] Attached SCSI removable disk
[  144.687148] fuse init (API version 7.20)
$ sudo blkid | grep /dev/sde
/dev/sde1: LABEL="test" UUID="2130BC3E3BF9C94B" TYPE="ntfs"

За какую ручку дёргать чтоб не перезагружаться?