[Re: Linux 2.6.26-rc2] Write protect on on

["Maciej Rutecki" <maciej.rutecki@gmail.com>]

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I have external drive connected via USB to computer. In 2.6.25.4 whenI plug into computer works fine, and have this messages in dmesg:usb 5-1: new high speed USB device using ehci_hcd and address 4usb 5-1: configuration #1 chosen from 1 choiceInitializing USB Mass Storage driver...scsi2 : SCSI emulation for USB Mass Storage devicesusbcore: registered new interface driver usb-storageUSB Mass Storage support registered.usb-storage: device found at 4usb-storage: waiting for device to settle before scanningscsi 2:0:0:0: Direct-Access     Initio   MHV2080BH PL     3.01 PQ: 0 ANSI: 0usb-storage: device scan completeDriver 'sd' needs updating - please use bus_type methodssd 2:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB)sd 2:0:0:0: [sda] Write Protect is offsd 2:0:0:0: [sda] Mode Sense: 00 00 00 00sd 2:0:0:0: [sda] Assuming drive cache: write throughsd 2:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB)sd 2:0:0:0: [sda] Write Protect is offsd 2:0:0:0: [sda] Mode Sense: 00 00 00 00sd 2:0:0:0: [sda] Assuming drive cache: write through sda: sda1sd 2:0:0:0: [sda] Attached SCSI disk
Works fine:maciek@zlom:~/kernel.org/2.6.25.4$ ntfsmount /dev/sda1 ~/mnt/ntfs/maciek@zlom:~/kernel.org/2.6.25.4$ mount | grep fusefusectl on /sys/fs/fuse/connections type fusectl (rw)/dev/sda1 on /home/maciek/mnt/ntfs type fuseblk(rw,nosuid,nodev,default_permissions,allow_other,blksize=4096,user=maciek)
But on 2.6.26-rc* sometimes I have messages "Write protect is on", e.g.:sd 2:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB)sd 2:0:0:0: [sda] Write Protect is onsd 2:0:0:0: [sda] Mode Sense: 09 50 f8 afsd 2:0:0:0: [sda] Assuming drive cache: write throughsd 2:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB)sd 2:0:0:0: [sda] Write Protect is offsd 2:0:0:0: [sda] Mode Sense: 00 00 00 00sd 2:0:0:0: [sda] Assuming drive cache: write through sda: sda1sd 2:0:0:0: [sda] Attached SCSI disk
or:sd 2:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB)sd 2:0:0:0: [sda] Write Protect is onsd 2:0:0:0: [sda] Mode Sense: 09 50 f8 afsd 2:0:0:0: [sda] Assuming drive cache: write throughsd 2:0:0:0: [sda] 156301488 512-byte hardware sectors (80026 MB)sd 2:0:0:0: [sda] Write Protect is onsd 2:0:0:0: [sda] Mode Sense: 09 50 f8 afsd 2:0:0:0: [sda] Assuming drive cache: write through sda: sda1sd 2:0:0:0: [sda] Attached SCSI disk
Then mount fails:maciek@zlom:~/kernel.org/2.6.26-rc2$ ntfsmount /dev/sda1 ~/mnt/ntfs/Error opening partition device: System plików wyłącznie do odczytu.Failed to startup volume: System plików wyłącznie do odczytu.Failed to mount '/dev/sda1': System plików wyłącznie do odczytu.Mount failed.
"System plików wyłącznie do odczytu." means "filesystem readonly"
Tested on two computers PC and laptop.
Dmesg and config:2.6.25.4: http://unixy.pl/maciek/download/kernel/2.6.25.4/2.6.26-rc1: http://unixy.pl/maciek/download/kernel/2.6.26-rc1/2.6.26-rc2: http://unixy.pl/maciek/download/kernel/2.6.26-rc2/
-- Maciej Ruteckihttp://www.maciek.unixy.plÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥