https://bugzilla.kernel.org/show_bug.cgi?id=89511 --- Comment #45 from Jun Itou <itou_jun@xxxxxxxxxxx> --- (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:~# -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
