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[debian-users:57418] Re: Debian7.7でUSB HDDの書込不可の不具合

　Jun Itouです。

お世話になります。

　kernel.orgから3.2.62と3.2.63をDLして両者をインストールし比較してみました。
　HDDは3.2.62でfdiskとmkfs.ext4を実行し、その状態で3.2.62と3.2.63でmountとumountを実行してdmesgを取得してみました。
　以下、両者のuname -aとdmesgのです。

 Linux sv-server 3.2.62 #1 SMP Mon Dec 8 16:11:25 JST 2014 x86_64 GNU/Linux
[   97.356924] usb 1-1: new high-speed USB device number 2 using ehci_hcd
[   97.659888] usb 1-1: New USB device found, idVendor=04bb, idProduct=0109
[   97.659892] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   97.659895] usb 1-1: Product: I-O DATA HDZ-UES
[   97.659897] usb 1-1: Manufacturer: I-O DATA DEVICE INC.
[   97.659899] usb 1-1: SerialNumber: 0000000042A4
[   97.710211] Initializing USB Mass Storage driver...
[   97.710896] scsi3 : usb-storage 1-1:1.0
[   97.711053] usbcore: registered new interface driver usb-storage
[   97.711055] USB Mass Storage support registered.
[   98.714628] scsi 3:0:0:0: Direct-Access     I-O DATA HDZ-UE1.0TS      6706 PQ: 0 ANSI: 0 CCS
[   98.716173] sd 3:0:0:0: Attached scsi generic sg2 type 0
[   98.720033] sd 3:0:0:0: [sdb] 1953588672 512-byte logical blocks: (1.00 TB/931 GiB)
[   98.726121] sd 3:0:0:0: [sdb] Write Protect is off
[   98.726125] sd 3:0:0:0: [sdb] Mode Sense: 34 00 00 00
[   98.733164] sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   98.762988]  sdb: sdb1
[   98.784513] sd 3:0:0:0: [sdb] Attached SCSI disk
[  126.657792] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)

Linux sv-server 3.2.63 #1 SMP Mon Dec 8 18:22:55 JST 2014 x86_64 GNU/Linux
[  101.331092] usb 1-1: new high-speed USB device number 2 using ehci_hcd
[  101.641961] usb 1-1: New USB device found, idVendor=04bb, idProduct=0109
[  101.641964] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  101.641967] usb 1-1: Product: I-O DATA HDZ-UES
[  101.641968] usb 1-1: Manufacturer: I-O DATA DEVICE INC.
[  101.641969] usb 1-1: SerialNumber: 0000000042A4
[  101.690910] Initializing USB Mass Storage driver...
[  101.692081] scsi3 : usb-storage 1-1:1.0
[  101.692298] usbcore: registered new interface driver usb-storage
[  101.692299] USB Mass Storage support registered.
[  102.696841] scsi 3:0:0:0: Direct-Access     I-O DATA HDZ-UE1.0TS      6706 PQ: 0 ANSI: 0 CCS
[  102.698543] sd 3:0:0:0: Attached scsi generic sg2 type 0
[  102.702731] sd 3:0:0:0: [sdb] 1953588672 512-byte logical blocks: (1.00 TB/931 GiB)
[  102.709340] sd 3:0:0:0: [sdb] Write Protect is off
[  102.709343] sd 3:0:0:0: [sdb] Mode Sense: 34 00 00 00
[  102.716254] sd 3:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[  102.743219]  sdb: sdb1
[  102.763781] sd 3:0:0:0: [sdb] Attached SCSI disk
[  112.707426] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)
[  117.075758] end_request: I/O error, dev sdb, sector 0
[  117.081523] end_request: I/O error, dev sdb, sector 973342744
[  117.081739] Aborting journal on device sdb1-8.
[  117.083837] journal commit I/O error
[  117.086427] EXT4-fs error (device sdb1): ext4_put_super:819: Couldn't clean up the journal
[  117.086716] EXT4-fs (sdb1): Remounting filesystem read-only

　ソースのdiffを取るとドライバーやファイルシステム等に手が入っているみたいです。
　そこから先の問題点の追求はどうやったらいいものか、現在手詰まり状態です。
　問題のソースファイルにたどり着くための手法等、アドバイスをいただけないでしょうか。

以上、宜しくお願いします。