linux-toradex.git/drivers/scsi/sd.h, branch imx-android-r10.4

[SCSI] sd: WRITE SAME(16) / UNMAP support

2009-12-10T14:54:15+00:00

Implement a function for handling discard requests that sends either
WRITE SAME(16) or UNMAP(10) depending on parameters indicated by the
device in the block limits VPD.

Extract unmap constraints and report them to the block layer.

Based in part by a patch by Christoph Hellwig .

Signed-off-by: Martin K. Petersen 
Signed-off-by: James Bottomley

[SCSI] sd: Support disks formatted with DIF Type 2

2009-10-02T14:47:04+00:00

Disks formatted with DIF Type 2 reject READ/WRITE 6/10/12/16 commands
when protection is enabled.  Only the 32-byte variants are supported.

Implement support for issusing 32-byte READ/WRITE and enable Type 2
drives in the protection type detection logic.

Signed-off-by: Martin K. Petersen 
Signed-off-by: James Bottomley

[SCSI] sd: Detach DIF from block integrity infrastructure

2009-10-02T14:46:39+00:00

So far we have only issued DIF commands if CONFIG_BLK_DEV_INTEGRITY is
enabled.  However, communication between initiator and target should be
independent of protection information DMA.  There are DIF-only host
adapters coming out that will be able to take advantage of this.

Move the relevant DIF bits to sd.c.

Signed-off-by: Martin K. Petersen 
Signed-off-by: James Bottomley

sd: Physical block size and alignment support

2009-06-21T15:52:37+00:00

Extract physical block size and lowest aligned LBA from READ
CAPACITY(16) response and adjust queue parameters.

Report physical block size and alignment when applicable.

[jejb: fix up trailing whitespace]
Signed-off-by: Martin K. Petersen 
Signed-off-by: James Bottomley

[SCSI] sd: Make revalidate less chatty

2009-03-18T01:43:52+00:00

sd_revalidate ends up being called several times during device setup.
With this patch we print everything during the first scan.  Subsequent
invocations will only print a message if the parameter in question has
actually changed (LUN capacity has increased, etc.).

Signed-off-by: Martin K. Petersen 
Signed-off-by: James Bottomley

[SCSI] sd: fix compile failure with CONFIG_BLK_DEV_INTEGRITY=n

2008-10-15T12:41:28+00:00

Signed-off-by: James Bottomley

[SCSI] sd: Correctly handle all combinations of DIF and DIX

2008-10-13T13:28:58+00:00

The old detection code couldn't handle all possible combinations of
DIX and DIF.  This version does, giving priority to DIX if the
controller is capable.

Signed-off-by: Martin K. Petersen 
Signed-off-by: James Bottomley

Re-introduce "[SCSI] extend the last_sector_bug flag to cover more sectors"

2008-08-06T04:42:21+00:00

This re-introduces commit 2b142900784c6e38c8d39fa57d5f95ef08e735d8,
which was reverted due to the regression it caused by commit
fca082c9f1e11ec07efa8d2f9f13688521253f36.

That regression was not root-caused by the original commit, it was just
uncovered by it, and the real fix was done by Alan Stern in commit
580da34847488b404218d1d7f53b156f245f5555 ("Fix USB storage hang on
command abort").

We can thus re-introduce the change that was confirmed by Alan Jenkins
to be still required by his odd card reader.

Cc: Alan Jenkins 
Cc: Alan Stern 
Cc: James Bottomley 
Signed-off-by: Linus Torvalds

Revert "[SCSI] extend the last_sector_bug flag to cover more sectors"

2008-08-04T23:36:20+00:00

This reverts commit 2b142900784c6e38c8d39fa57d5f95ef08e735d8, since it
seems to break some other USB storage devices (at least a JMicron USB to
ATA bridge).  As such, while it apparently fixes some cardreaders, it
would need to be made conditional on the exact reader it fixes in order
to avoid causing regressions.

Cc: Alan Jenkins 
Cc: James Bottomley 
Signed-off-by: Linus Torvalds

[SCSI] extend the last_sector_bug flag to cover more sectors

2008-07-27T14:16:13+00:00

The last_sector_bug flag was added to work around a bug in certain usb
cardreaders, where they would crash if a multiple sector read included the
last sector. The original implementation avoids this by e.g. splitting an 8
sector read which includes the last sector into a 7 sector read, and a single
sector read for the last sector.  The flag is enabled for all USB devices.

This revealed a second bug in other usb cardreaders, which crash when they
get a multiple sector read which stops 1 sector short of the last sector.
Affected hardware includes the Kingston "MobileLite" external USB cardreader
and the internal USB cardreader on the Asus EeePC.

Extend the last_sector_bug workaround to ensure that any access which touches
the last 8 hardware sectors of the device is a single sector long.  Requests
are shrunk as necessary to meet this constraint.

This gives us a safety margin against potential unknown or future bugs
affecting multi-sector access to the end of the device.  The two known bugs
only affect the last 2 sectors.  However, they suggest that these devices
are prone to fencepost errors and that multi-sector access to the end of the
device is not well tested.  Popular OS's use multi-sector accesses, but they
rarely read the last few sectors.  Linux (with udev & vol_id) automatically
reads sectors from the end of the device on insertion.  It is assumed that
single sector accesses are more thoroughly tested during development.

Signed-off-by: Alan Jenkins 
Tested-by: Alan Jenkins 
Signed-off-by: James Bottomley