directIO on usb mass storage/scsi device in 2.4 kernel

[syed khader <sk.syed@xxxxxxxxx>]

hi 
  I am having problems getting directIO(file write
using O_DIRECT) work on scsi device(seagate usb hard
drive) on an ARM platform.
 I really dont know if it is a sg driver or USB
problem, so I am posting it here.
  Any pointers would definitely help.
Thanks
Syed

 Here are the details:
1) cat /proc/scsi/sg/version
30125   Version: 3.1.25 (20030529)
2) Linux kernel 2.4.35 
3) mount -t ext2 /dev/sda2 /var/usb
4) echo 1 > /proc/scsi/sg/allow_dio
5) Code used to test:
  int in,out
 wrkBuffRaw= memalign(getpagesize(),
34*getpagesize());
  in = open("/dev/zero", O_RDONLY);
  out = open("/var/usb/temp",
O_RDWR|O_CREAT|O_DIRECT);
(or out = open("/dev/sda2",O_RDWR|O_DIRECT);)
  read(in, wrkBuffRaw, BUFSZ);
  write(out, wrkBuffRaw, BUFSZ)
  The same code works fine if I do read from the sda2
with o_direct(same is the case with sg_dd utility)
6) 
CONFIG_SCSI=y
CONFIG_BLK_DEV_SD=y
CONFIG_SD_EXTRA_DEVS=40
CONFIG_CHR_DEV_SG=y
CONFIG_USB=y
CONFIG_USB_DEBUG=y
CONFIG_USB_DEVICEFS=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_STORAGE=y

7) This is verbose debug:
usb-storage: queuecommand() called
usb-storage: *** thread awakened.
usb-storage: Command READ_10 (10 bytes)
usb-storage: 28 00 00 00 00 87 00 00 08 00 00 00
usb-storage: Bulk command S 0x43425355 T 0x26 Trg 0
LUN 0 L 4096 F 128 CL 10
usb-storage: Bulk command transfer result=0
usb-storage: usb_stor_transfer_partial(): xfer 4096
bytes
usb-storage: usb_stor_bulk_msg() returned 0 xferred
4096/4096
usb-storage: usb_stor_transfer_partial(): transfer
complete
usb-storage: Bulk data transfer result 0x0
usb-storage: Attempting to get CSW...
usb-storage: Bulk status result = 0
usb-storage: Bulk status Sig 0x53425355 T 0x26 R 0
Stat 0x0
usb-storage: scsi cmd done, result=0x0
usb-storage: *** thread sleeping.
usb-storage: queuecommand() called
usb-storage: *** thread awakened.
usb-storage: Command WRITE_10 (10 bytes)
usb-storage: 2a 00 00 00 10 c7 00 00 60 00 00 00
usb-storage: Bulk command S 0x43425355 T 0x27 Trg 0
LUN 0 L 49152 F 0 CL 10
usb-storage: Bulk command transfer result=0
usb-storage: usb_stor_transfer_partial(): xfer 4096
bytes
ehci_hcd <NULL>: devpath 1 ep2out 3strikes
usb-storage: usb_stor_bulk_msg() returned -71 xferred
512/4096
usb-storage: usb_stor_transfer_partial(): unknown
error
usb-storage: Bulk data transfer result 0x2
usb-storage: Attempting to get CSW...
usb-storage: command_abort() called
usb-storage: -- transport indicates command was
aborted
usb-storage: Bulk reset requested

usb-storage: usb_stor_clear_halt: result=0
usb-storage: usb_stor_clear_halt: result=0
usb-storage: Bulk soft reset completed
usb-storage: scsi command aborted
usb-storage: *** thread sleeping.
usb-storage: queuecommand() called
usb-storage: *** thread awakened.
usb-storage: Command TEST_UNIT_READY (6 bytes)
usb-storage: 00 00 00 00 00 00 00 00 60 00 00 00
usb-storage: Bulk command S 0x43425355 T 0x28 Trg 0
LUN 0 L 0 F 0 CL 6
usb-storage: Bulk command transfer result=0
usb-storage: Attempting to get CSW...
usb-storage: Bulk status result = 0
usb-storage: Bulk status Sig 0x53425355 T 0x28 R 0
Stat 0x0
usb-storage: scsi cmd done, result=0x0
usb-storage: *** thread sleeping.
usb-storage: queuecommand() called
usb-storage: *** thread awakened.
usb-storage: Command WRITE_10 (10 bytes)
usb-storage: 2a 00 00 00 10 c7 00 00 60 00 00 00
usb-storage: Bulk command S 0x43425355 T 0x29 Trg 0
LUN 0 L 49152 F 0 CL 10
usb-storage: Bulk command transfer result=0
usb-storage: usb_stor_transfer_partial(): xfer 4096
bytes
usb-storage: usb_stor_bulk_msg() returned 0 xferred
32/4096
usb-storage: Bulk data transfer result 0x1
usb-storage: Attempting to get CSW...
usb-storage: command_abort() called
usb-storage: -- transport indicates command was
aborted
usb-storage: Bulk reset requested
usb-storage: usb_stor_clear_halt: result=0
usb-storage: usb_stor_clear_halt: result=0
usb-storage: Bulk soft reset completed
usb-storage: scsi command aborted
usb-storage: *** thread sleeping.
usb-storage: device_reset() called
usb-storage: Bulk reset requested
usb-storage: usb_stor_clear_halt: result=0
usb-storage: usb_stor_clear_halt: result=0
usb-storage: Bulk soft reset completed
usb-storage: queuecommand() called
usb-storage: *** thread awakened.
usb-storage: Command TEST_UNIT_READY (6 bytes)
usb-storage: 00 00 00 00 00 00 00 00 60 00 00 00
usb-storage: Bulk command S 0x43425355 T 0x2a Trg 0
LUN 0 L 0 F 0 CL 6
usb-storage: Bulk command transfer result=0
usb-storage: Attempting to get CSW...
usb-storage: Bulk status result = 0
usb-storage: Bulk status Sig 0x53425355 T 0x2a R 0
Stat 0x0
usb-storage: scsi cmd done, result=0x0
usb-storage: *** thread sleeping.
usb-storage: queuecommand() called
usb-storage: *** thread awakened.
usb-storage: Command WRITE_10 (10 bytes)
usb-storage: 2a 00 00 00 10 c7 00 00 60 00 00 00
usb-storage: Bulk command S 0x43425355 T 0x2b Trg 0
LUN 0 L 49152 F 0 CL 10
usb-storage: Bulk command transfer result=0
usb-storage: usb_stor_transfer_partial(): xfer 4096
bytes
usb-storage: usb_stor_bulk_msg() returned 0 xferred
32/4096
usb-storage: Bulk data transfer result 0x1
usb-storage: Attempting to get CSW...
usb-storage: command_abort() called
usb-storage: -- transport indicates command was
aborted
usb-storage: Bulk reset requested
usb-storage: usb_stor_clear_halt: result=0
usb-storage: usb_stor_clear_halt: result=0
usb-storage: Bulk soft reset completed
usb-storage: scsi command aborted
usb-storage: *** thread sleeping.
usb-storage: bus_reset() called
hub.c: port 1, portstatus 511, change 0, 480 Mb/s
hub.c: port 1 of hub 1 not reset yet, waiting 10ms
hub.c: port 1, portstatus 511, change 0, 480 Mb/s
hub.c: port 1 of hub 1 not reset yet, waiting 10ms
hub.c: port 1, portstatus 503, change 0, 480 Mb/s
usb.c: ignoring set_interface for dev 2, iface 0, alt
0
usb-storage: Examinging driver usb-storage...skipping
ourselves.
usb-storage: bus_reset() complete
usb-storage: queuecommand() called
usb-storage: *** thread awakened.
usb-storage: Command TEST_UNIT_READY (6 bytes)
usb-storage: 00 00 00 00 00 00 00 00 60 00 00 00
usb-storage: Bulk command S 0x43425355 T 0x2c Trg 0
LUN 0 L 0 F 0 CL 6
usb-storage: Bulk command transfer result=0
usb-storage: Attempting to get CSW...
usb-storage: Bulk status result = 0
usb-storage: Bulk status Sig 0x53425355 T 0x2c R 0
Stat 0x0
usb-storage: scsi cmd done, result=0x0
usb-storage: *** thread sleeping.
usb-storage: queuecommand() called
usb-storage: *** thread awakened.
usb-storage: Command WRITE_10 (10 bytes)
usb-storage: 2a 00 00 00 10 c7 00 00 60 00 00 00
usb-storage: Bulk command S 0x43425355 T 0x2d Trg 0
LUN 0 L 49152 F 0 CL 10
usb-storage: Bulk command transfer result=0
usb-storage: usb_stor_transfer_partial(): xfer 4096
bytes
usb-storage: usb_stor_bulk_msg() returned 0 xferred
32/4096
usb-storage: Bulk data transfer result 0x1
usb-storage: Attempting to get CSW...
usb-storage: command_abort() called
usb-storage: -- transport indicates command was
aborted
usb-storage: Bulk reset requested
usb-storage: usb_stor_clear_halt: result=0
usb-storage: usb_stor_clear_halt: result=0
usb-storage: Bulk soft reset completed
usb-storage: scsi command aborted
usb-storage: *** thread sleeping.
scsi: device set offline - not ready or command retry
failed after bus reset: host 0 channel 0 id 0 lun 0
SCSI disk error : host 0 channel 0 id 0 lun 0 return
code = 50000
 I/O error: dev 08:01, sector 4232
 I/O error: dev 08:01, sector 4240
 I/O error: dev 08:01, sector 4328
 I/O error: dev 08:01, sector 0
 I/O error: dev 08:01, sector 72
 I/O error: dev 08:01, sector 88
writing error: Input/output error
time to transfer data was 159.096150 secs
# 
#  I/O error: dev 08:01, sector 88
 I/O error: dev 08:01, sector 0
EXT2-fs error (device sd(8,1)): ext2_write_inode:
unable to read inode block - inode=12, block=11
 I/O error: dev 08:01, sector 8
 I/O error: dev 08:01, sector 72




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