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    Subject[PATCH][RFC 20/23]: Documentation for scst_local driver
    This patch contains documentation for scst_local driver.

    Signed-off-by: Richard Sharpe <>
    Signed-off-by: Vladislav Bolkhovitin <>
    Documentation/scst/README.scst_local | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 95 insertions(+)

    diff -uprN orig/linux-2.6.27/Documentation/scst/README.scst_local linux-2.6.27/Documentation/scst/README.scst_local
    --- orig/linux-2.6.27/Documentation/scst/README.scst_local
    +++ linux-2.6.27/Documentation/scst/README.scst_local
    @@ -0,0 +1,95 @@
    +SCST Debug ...
    +Richard Sharpe, 30-Nov-2008
    +This is the SCST Local driver. Its function is to allow you to access devices
    +that are exported via SCST directly on the same Linux system that they are
    +exported from.
    +No assumptions are made in the code about the device types on the target, so
    +any device handlers that you load in SCST should be visible, including tapes
    +and so forth.
    +To build, simply issue 'make' in the scst-local directory.
    +Try 'modinfo scst_local' for a listing of module parameters so far.
    +NOTE! This is now part of scst and supports being built in the scst tree.
    +Here is how I have used it so far:
    +1. Load up scst:
    + modprobe scst
    + modprobe scst_vdisk
    +2. Create a virtual disk (or your own device handler):
    + dd if=/dev/zero of=/some/path/vdisk1.img bs=16384 count=1000000
    +# dd if=/dev/zero of=/some/path/vdisk2.img bs=16384 count=1000000
    + echo "open vm_disk1 /some/path/vdisk1.img" > /proc/scsi_tgt/vdisk/vdisk
    +# echo "open vm_disk2 /some/path/vdisk2.img" > /proc/scsi_tgt/vdisk/vdisk
    + echo "add vm_disk1 0" > /proc/scsi_tgt/groups/Default/devices
    +# echo "add vm_disk2 1" > /proc/scsi_tgt/groups/Default/devices
    +3. Load the scst_local driver:
    + insmod scst_local
    +# insmod scst_local max_luns=8
    +4. Check what you have
    + cat /proc/scsi/scsi
    + Attached devices:
    + Host: scsi0 Channel: 00 Id: 00 Lun: 00
    + Vendor: ATA Model: ST9320320AS Rev: 0303
    + Type: Direct-Access ANSI SCSI revision: 05
    + Host: scsi4 Channel: 00 Id: 00 Lun: 00
    + Vendor: TSSTcorp Model: CD/DVDW TS-L632D Rev: TO04
    + Type: CD-ROM ANSI SCSI revision: 05
    + Host: scsi7 Channel: 00 Id: 00 Lun: 00
    + Vendor: SCST_FIO Model: vm_disk1 Rev: 101
    + Type: Direct-Access ANSI SCSI revision: 04
    +5. Have fun.
    +Some of this was coded while in Santa Clara, some in Bangalore, and some in
    +Hyderabad. Noe doubt some will be coded on the way back to Santa Clara.
    +The code still has bugs, so if you encounter any, email me the fixes at:
    +I am thinking of renaming this to something more interesting.
    +6. Change log
    +V0.1 24-Sep-2008 (Hyderabad) Initial coding, pretty chatty and messy,
    + but worked.
    +V0.2 25-Sep-2008 (Hong Kong) Cleaned up the code a lot, reduced the log
    + chatter, fixed a bug where multiple LUNs did not
    + work. Also, added logging control. Tested with
    + five virtual disks. They all came up as /dev/sdb
    + through /dev/sdf and I could dd to them. Also
    + fixed a bug preventing multiple adapters.
    +V0.3 26-Sep-2008 (Santa Clara) Added back a copyright plus cleaned up some
    + unused functions and structures.
    +V0.4 5-Oct-2008 (Santa Clara) Changed name to scst_local as suggested, cleaned
    + up some unused variables (made them used) and
    + change allocation to a kmem_cache pool.
    +V0.5 5-Oct-2008 (Santa Clara) Added mgmt commands to handle dev reset and
    + aborts. Not sure if aborts works. Also corrected
    + the version info and renamed readme to README.
    +V0.6 7-Oct-2008 (Santa Clara) Removed some redundant code and made some
    + changes suggested by Vladislav.
    +V0.7 11-Oct-2008 (Santa Clara) Moved into the scst tree. Cleaned up some
    + unused functions, used TRACE macros etc.
    +V0.9 30-Nov-2008 (Mtn View) Cleaned up an additional problem with symbols not
    + being defined in older version of the kernel. Also
    + fixed some English and cleaned up this doc.

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