linux-toradex.git/include/linux/bsg.h, branch tegra-10.9.1

Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6

2009-03-28T20:30:43+00:00

* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (119 commits)
  [SCSI] scsi_dh_rdac: Retry for NOT_READY check condition
  [SCSI] mpt2sas: make global symbols unique
  [SCSI] sd: Make revalidate less chatty
  [SCSI] sd: Try READ CAPACITY 16 first for SBC-2 devices
  [SCSI] sd: Refactor sd_read_capacity()
  [SCSI] mpt2sas v00.100.11.15
  [SCSI] mpt2sas: add MPT2SAS_MINOR(221) to miscdevice.h
  [SCSI] ch: Add scsi type modalias
  [SCSI] 3w-9xxx: add power management support
  [SCSI] bsg: add linux/types.h include to bsg.h
  [SCSI] cxgb3i: fix function descriptions
  [SCSI] libiscsi: fix possbile null ptr session command cleanup
  [SCSI] iscsi class: remove host no argument from session creation callout
  [SCSI] libiscsi: pass session failure a session struct
  [SCSI] iscsi lib: remove qdepth param from iscsi host allocation
  [SCSI] iscsi lib: have lib create work queue for transmitting IO
  [SCSI] iscsi class: fix lock dep warning on logout
  [SCSI] libiscsi: don't cap queue depth in iscsi modules
  [SCSI] iscsi_tcp: replace scsi_debug/tcp_debug logging with iscsi conn logging
  [SCSI] libiscsi_tcp: replace tcp_debug/scsi_debug logging with session/conn logging
  ...

bsg: add support for tail queuing

2009-03-24T11:35:17+00:00

Currently inherited from sg.c bsg will submit asynchronous request
 at the head-of-the-queue, (using "at_head" set in the call to
 blk_execute_rq_nowait()). This is bad in situation where the queues
 are full, requests will execute out of order, and can cause
 starvation of the first submitted requests.

The sg_io_v4->flags member is used and a bit is allocated to denote the
Q_AT_TAIL. Zero is to queue at_head as before, to be compatible with old
code at the write/read path. SG_IO code path behavior was changed so to
be the same as write/read behavior. SG_IO was very rarely used and breaking
compatibility with it is OK at this stage.

sg_io_hdr at sg.h also has a flags member and uses 3 bits from the first
nibble and one bit from the last nibble. Even though none of these bits
are supported by bsg, The second nibble is allocated for use by bsg. Just
in case.

Signed-off-by: Boaz Harrosh 
CC: Douglas Gilbert 
Signed-off-by: Jens Axboe

[SCSI] bsg: add linux/types.h include to bsg.h

2009-03-13T20:33:25+00:00

Since bsg.h has recently been added to the list of kernel
headers that should be exported to the user space, this
attachment makes bsg.h more user space "friendly".
Specifically autotools dislike headers that don't compile
freestanding and bsg.h's use of __u32 types (and friends)
are not standard C (C90 or C99). The inclusion of
linux/types.h fixes that.

Signed-off-by: Douglas Gilbert 
Signed-off-by: James Bottomley

[SCSI] bsg: add release callback support

2008-04-22T20:16:32+00:00

This patch adds release callback support, which is called when a bsg
device goes away. bsg_register_queue() takes a pointer to a callback
function. This feature is useful for stuff like sas_host that can't
use the release callback in struct device.

If a caller doesn't need bsg's release callback, it can call
bsg_register_queue() with NULL pointer (e.g. scsi devices can use
release callback in struct device so they don't need bsg's callback).

With this patch, bsg uses kref for refcounts on bsg devices instead of
get/put_device in fops->open/release. bsg calls put_device and the
caller's release callback (if it was registered) in kref_put's
release.

Signed-off-by: FUJITA Tomonori 
Signed-off-by: James Bottomley

SCSI: convert struct class_device to struct device

2008-04-20T02:10:33+00:00

It's big, but there doesn't seem to be a way to split it up smaller...

Signed-off-by: Tony Jones 
Signed-off-by: Kay Sievers 
Cc: Roland Dreier 
Cc: Sean Hefty 
Cc: Hal Rosenstock 
Cc: James Bottomley 
Signed-off-by: Greg Kroah-Hartman

[SCSI] bsg: update sg_io_v4 structure

2007-07-31T15:43:05+00:00

This updates sg_io_v4 structure (based on Doug's RFC, release 1.3).

The major changes are:

- add dout_resid field
- increase tag size to 64 bits to comply with SAM-4 and SRP
- add dout_iovec_count and din_iovec_count

dout_iovec_count and din_iovec_count aren't supported now. I'm not
sure whether they will be supported or not but they were added for the
possible future changes.

Signed-off-by: FUJITA Tomonori 
Signed-off-by: James Bottomley

[SCSI] bsg: fix unused variable warnings for BLK_DEV_BSG=n

2007-07-24T18:24:05+00:00

Just using #defines for the
bsg_register_queue()/bsg_unregister_queue() can cause undefined
variables when they're defined to nothing.  Use dummy inline functions
instead.

Signed-off-by: James Bottomley

[SCSI] bsg: use lib/idr.c to find a unique minor number

2007-07-23T21:49:44+00:00

This replaces the current linear search for a unique minor number with
lib/idr.c.

Signed-off-by: FUJITA Tomonori 
Acked-by: Jens Axboe 
Signed-off-by: James Bottomley

[SCSI] bsg: make class backlinks

2007-07-21T13:58:23+00:00

Currently, bsg doesn't make class backlinks (a process whereby you'd get
a link to bsg in the device directory in the same way you get one for
sg).  This is because the bsg device is uninitialised, so the class
device has nothing it can attach to.  The fix is to make the bsg device
point to the cdevice of the entity creating the bsg, necessitating
changing the bsg_register_queue() prototype into a form that takes the
generic device.

Acked-by: FUJITA Tomonori 
Signed-off-by: James Bottomley

Don't define empty struct bsg_class_device if !CONFIG_BLK_DEV_BSG

2007-07-17T12:18:47+00:00

Don't define an empty struct bsg_class_device if !CONFIG_BLK_DEV_BSG.

It's embedded in struct request_queue, but there we have

#if defined(CONFIG_BLK_DEV_BSG)
	struct bsg_class_device bsg_dev;
#endif

anyway.

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Jens Axboe