From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 89511] USB-storage mount error
Date: Fri, 09 Jan 2015 20:56:23 +0000
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--- Comment #45 from Jun Itou ---
(In reply to Alan Stern from comment #44)
> What happens if you unplug the drive while the computer is off and then plug
> it in after booting 3.2.62?
Because only this controller was different in the behavior after the boot, I
tried it in various ways.
It becomes "write back" even if I do plug in after a boot.
So movement becomes funny when I turn on the power supply of the HDD and do not
reset it.
I think that originally the bug that there was came to the front by a
correction after 6.2.63 from this phenomenon.
3.2.62 is a result when plug in assumed an HDD it during operation as follows.
root@sv-server:~# mount -t debugfs none_debugs /sys/kernel/debug
root@sv-server:~# dmesg -c
[ 128.833831] usb 1-1: new high-speed USB device number 2 using ehci_hcd
[ 129.334896] usb 1-1: New USB device found, idVendor=04bb, idProduct=0106
[ 129.334900] usb 1-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 129.334902] usb 1-1: Product: I-O DATA HDW-UE
[ 129.334903] usb 1-1: Manufacturer: I-O DATA DEVICE,INC.
[ 129.334905] usb 1-1: SerialNumber: 0000000004EB
[ 129.408145] Initializing USB Mass Storage driver...
[ 129.409110] scsi3 : usb-storage 1-1:1.0
[ 129.409270] usbcore: registered new interface driver usb-storage
[ 129.409271] USB Mass Storage support registered.
[ 136.595439] scsi 3:0:0:0: Direct-Access I-O DATA HDW-UE 0100
PQ: 0 ANSI: 2
[ 136.597840] sd 3:0:0:0: Attached scsi generic sg2 type 0
[ 136.605850] sd 3:0:0:0: [sdb] 1953546336 512-byte logical blocks: (1.00
TB/931 GiB)
[ 136.611429] sd 3:0:0:0: [sdb] Write Protect is off
[ 136.611438] sd 3:0:0:0: [sdb] Mode Sense: 53 00 00 08
[ 136.616835] sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled,
doesn't support DPO or FUA
[ 136.652793] sdb: sdb1
[ 136.670708] sd 3:0:0:0: [sdb] Attached SCSI disk
root@sv-server:~# cat /sys/block/sdb/device/scsi_disk/*/cache_type
write back
root@sv-server:~#
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