linux-toradex.git/drivers/target/target_core_rd.c, branch v3.6.6

target: add struct spc_ops + initial ->execute_rw pointer usage

2012-07-17T00:29:12+00:00

Remove the execute_cmd method in struct se_subsystem_api, and always use the
one directly in struct se_cmd.  To make life simpler for SBC virtual backends
a struct spc_ops that is passed to sbc_parse_cmd is added.  For now it
only contains an execute_rw member, but more will follow with the subsequent
commits.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: add a parse_cdb method to the backend drivers

2012-07-17T00:25:56+00:00

Instead of trying to handle all SCSI command sets in one function
(transport_generic_cmd_sequencer) call out to the backend driver to perform
this functionality.  For pSCSI a copy of the existing code is used, but for
all virtual backends we can use a new parse_sbc_cdb helper is used to
provide a simple SBC emulation.

For now this setups means a fair amount of duplication between pSCSI and the
SBC library, but patches later in this series will sort out that problem.

(nab: Fix up build failure in target_core_pscsi.c)

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: remove struct se_task

2012-05-06T22:11:26+00:00

We can use struct se_cmd for everything it did.  Make sure to pass the S/G
list and data direction to the execution function to ease adding back BIDI
support later on.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: remove the task_size field in struct se_task

2012-05-06T22:03:41+00:00

Now that we don't split commands the size field in the task is always
equivalent to the one in the CDB, even in cases where we have two tasks
due to a BIDI transfer.  Just refer the the size in the command instead
of duplicating it in the task.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: remove the task_lba field in struct se_task

2012-05-06T22:02:59+00:00

Now that we don't split commands the lba field in the task is always
equivalent to the one in the CDB, even in cases where we have two tasks
due to a BIDI transfer.  Just refer the the lba in the command instead
of duplicating it in the task.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: don't limit transfer sizes for the ramdisk backend

2012-04-15T00:40:30+00:00

The ramdisk backend has not inherent limitations for handling requests,
so don't artificially limits the transfer size.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: misc ramdisk backend cleanups

2012-04-15T00:40:30+00:00

Remove various leftovers of the old direct/indirect split, as well as the
unused rd_request structure and a couple unused defines and fields.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target: use \n as a separator for configuration

2011-12-14T11:27:23+00:00

The command
| echo rd_pages=32768 > ramdisk/control

Does not work because it writes "rd_pages=32768\n" and the parser which
matches for "rd_pages=%d" does not recognize it due to the \n. One way
of fixing this would be using "echo -n" instead.
This patch adds \n to the list of separators so we don't have to use the
-n argument which I find is more convinient.

Signed-off-by: Sebastian Andrzej Siewior 
Signed-off-by: Nicholas Bellinger

target: header reshuffle, part2

2011-12-14T11:26:05+00:00

This reorganized the headers under include/target into:

 - target_core_base.h stays as is with all target-wide data stuctures and defines
 - target_core_backend.h contains the whole interface to I/O backends
 - target_core_fabric.h contains the whole interface to fabric modules

Except for those only the various configfs macro headers stay around.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Nicholas Bellinger

target/rd: fix or rewrite the copy routine

2011-12-06T06:00:58+00:00

So the code assumes that the sg list is only a array while in reality
loopback SGL memory via scsi_cmnd into target-core may be already
chained.  This patch converts ramdisk code to use sg_miter logic from
scatterlist.h in order to properly support passthrough SGL usage with
transport_generic_map_mem_to_cmd() via loopback.

With this patch the bug goes away. However after umount/mount of the
device my files are gone. So something is still not right. After looking
at it for a while I decided to rewrite the that part of the code and now
things do work for me.

For reference:
- http://article.gmane.org/gmane.linux.scsi.target.devel/595
  the sg_next() conversion
- http://article.gmane.org/gmane.linux.scsi.target.devel/602
  the rewrite of the copy code

(nab: Fix compile warning in rd_MEMCPY)

Signed-off-by: Sebastian Andrzej Siewior 
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger