kernel.git/drivers/scsi/scsi_lib.c, branch linux-4.6.y

scsi_lib: correctly retry failed zero length REQ_TYPE_FS commands

2016-06-24T17:21:59Z

commit a621bac3044ed6f7ec5fa0326491b2d4838bfa93 upstream. When SCSI was written, all commands coming from the filesystem (REQ_TYPE_FS commands) had data. This meant that our signal for needing to complete the command was the number of bytes completed being equal to the number of bytes in the request. Unfortunately, with the advent of flush barriers, we can now get zero length REQ_TYPE_FS commands, which confuse this logic because they satisfy the condition every time. This means they never get retried even for retryable conditions, like UNIT ATTENTION because we complete them early assuming they're done. Fix this by special casing the early completion condition to recognise zero length commands with errors and let them drop through to the retry code. Reported-by: Sebastian Parschauer Signed-off-by: James E.J. Bottomley Tested-by: Jack Wang Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman

Merge branch 'fixes' into misc

2016-03-15T22:24:44Z

SCSI: Free resources when we return BLKPREP_INVALID

2016-02-26T22:25:32Z

When called scsi_prep_fn return BLKPREP_INVALID, we should use the same code with BLKPREP_KILL in scsi_prep_return. Signed-off-by: Yiwen Jiang Signed-off-by: Martin K. Petersen

scsi_dh: add 'rescan' callback

2016-02-24T02:27:02Z

If a device needs to be rescanned the device_handler might need to be rechecked, too. So add a 'rescan' callback to the device handler and call it upon scsi_rescan_device(). The rescan callback will be invoked from the Unit Attention handling of ASC/ASCQ 3F 03 (INQUIRY DATA HAS CHANGED). Reviewed-by: Bart Van Assche Reviewed-by: Christoph Hellwig Signed-off-by: Hannes Reinecke Signed-off-by: Martin K. Petersen

scsi: Add scsi_vpd_tpg_id()

2015-12-02T21:43:11Z

Implement scsi_vpd_tpg_id() to extract the target port group id and the relative port id from SCSI VPD page 0x83. Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig Signed-off-by: Hannes Reinecke Signed-off-by: Martin K. Petersen

scsi: Add scsi_vpd_lun_id()

2015-12-02T21:40:19Z

Add a function scsi_vpd_lun_id() to return a unique device identifcation based on the designation descriptors of VPD page 0x83. As devices might implement several descriptors the order of preference is: - NAA IEE Registered Extended - EUI-64 based 16-byte - EUI-64 based 12-byte - NAA IEEE Registered - NAA IEEE Extended A SCSI name string descriptor is preferred to all of them if the identification is longer than 16 bytes. The returned unique device identification will be formatted as a SCSI Name string to avoid clashes between different designator types. [mkp: Fixed up kernel doc comment from Johannes] Signed-off-by: Hannes Reinecke Reviewed-by: Ewan Milne Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig Signed-off-by: Martin K. Petersen

mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM

2015-11-07T01:50:42Z

__GFP_WAIT was used to signal that the caller was in atomic context and could not sleep. Now it is possible to distinguish between true atomic context and callers that are not willing to sleep. The latter should clear __GFP_DIRECT_RECLAIM so kswapd will still wake. As clearing __GFP_WAIT behaves differently, there is a risk that people will clear the wrong flags. This patch renames __GFP_WAIT to __GFP_RECLAIM to clearly indicate what it does -- setting it allows all reclaim activity, clearing them prevents it. [akpm@linux-foundation.org: fix build] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mel Gorman Acked-by: Michal Hocko Acked-by: Vlastimil Babka Acked-by: Johannes Weiner Cc: Christoph Lameter Acked-by: David Rientjes Cc: Vitaly Wool Cc: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

blk-mq: fix racy updates of rq->errors

2015-10-01T08:10:55Z

blk_mq_complete_request may be a no-op if the request has already been completed by others means (e.g. a timeout or cancellation), but currently drivers have to set rq->errors before calling blk_mq_complete_request, which might leave us with the wrong error value. Add an error parameter to blk_mq_complete_request so that we can defer setting rq->errors until we known we won the race to complete the request. Signed-off-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe

scsi_dh: kill struct scsi_dh_data

2015-08-28T20:14:57Z

Add a ->handler and a ->handler_data field to struct scsi_device and kill this indirection. Also move struct scsi_device_handler to scsi_dh.h so that changes to it don't require rebuilding every SCSI LLDD. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Reviewed-by: Hannes Reinecke Signed-off-by: James Bottomley

scsi: Add ALUA state change UA handling

2015-08-26T14:19:57Z

Log the ALUA state change unit attention correctly with the message log and emit an event to allow user-space tools to react to it. Signed-off-by: Hannes Reinecke Reviewed-by: Ewan D. Milne Reviewed-by: Bart Van Assche Signed-off-by: James Bottomley