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[SCSI] sd: Update WRITE SAME heuristics 

SATA drives located behind a SAS controller would incorrectly receive
WRITE SAME commands. Tweak the heuristics so that:

 - If REPORT SUPPORTED OPERATION CODES is provided we will use that to
   choose between WRITE SAME(16), WRITE SAME(10) and disabled. This also
   fixes an issue with the old code which would issue WRITE SAME(10)
   despite the command not being whitelisted in REPORT SUPPORTED
   OPERATION CODES.

 - If REPORT SUPPORTED OPERATION CODES is not provided we will fall back
   to WRITE SAME(10) unless the device has an ATA Information VPD page.
   The assumption is that a SATL which is smart enough to implement
   WRITE SAME would also provide REPORT SUPPORTED OPERATION CODES.

To facilitate the new heuristics scsi_report_opcode() has been modified
to so we can distinguish between "operation not supported" and "RSOC not
supported".

Reported-by: H. Peter Anvin <hpa@zytor.com>
Tested-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Martin K. Petersen 2013-06-06 22:15:55 -04:00 committed by James Bottomley
parent 5d65f91896
commit 66c28f9712
3 changed files with 37 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/scsi/scsi.c
View File

@ -1070,8 +1070,8 @@ EXPORT_SYMBOL_GPL(scsi_get_vpd_page);
* @opcode: opcode for command to look up
*
* Uses the REPORT SUPPORTED OPERATION CODES to look up the given
* opcode. Returns 0 if RSOC fails or if the command opcode is
* unsupported. Returns 1 if the device claims to support the command.
* opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is
* unsupported and 1 if the device claims to support the command.
*/
int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
unsigned int len, unsigned char opcode)
@ -1081,7 +1081,7 @@ int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
int result;
if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3)
return 0;
return -EINVAL;
memset(cmd, 0, 16);
cmd[0] = MAINTENANCE_IN;
@ -1097,7 +1097,7 @@ int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
if (result && scsi_sense_valid(&sshdr) &&
sshdr.sense_key == ILLEGAL_REQUEST &&
(sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00)
return 0;
return -EINVAL;
if ((buffer[1] & 3) == 3) /* Command supported */
return 1;

46
drivers/scsi/sd.c
View File

@ -442,8 +442,10 @@ sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
if (max == 0)
sdp->no_write_same = 1;
else if (max <= SD_MAX_WS16_BLOCKS)
else if (max <= SD_MAX_WS16_BLOCKS) {
sdp->no_write_same = 0;
sdkp->max_ws_blocks = max;
}
sd_config_write_same(sdkp);
@ -750,7 +752,6 @@ static void sd_config_write_same(struct scsi_disk *sdkp)
{
struct request_queue *q = sdkp->disk->queue;
unsigned int logical_block_size = sdkp->device->sector_size;
unsigned int blocks = 0;
if (sdkp->device->no_write_same) {
sdkp->max_ws_blocks = 0;
@ -762,18 +763,20 @@ static void sd_config_write_same(struct scsi_disk *sdkp)
* blocks per I/O unless the device explicitly advertises a
* bigger limit.
*/
if (sdkp->max_ws_blocks == 0)
sdkp->max_ws_blocks = SD_MAX_WS10_BLOCKS;
if (sdkp->ws16 || sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
blocks = min_not_zero(sdkp->max_ws_blocks,
(u32)SD_MAX_WS16_BLOCKS);
else
blocks = min_not_zero(sdkp->max_ws_blocks,
(u32)SD_MAX_WS10_BLOCKS);
if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
(u32)SD_MAX_WS16_BLOCKS);
else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
(u32)SD_MAX_WS10_BLOCKS);
else {
sdkp->device->no_write_same = 1;
sdkp->max_ws_blocks = 0;
}
out:
blk_queue_max_write_same_sectors(q, blocks * (logical_block_size >> 9));
blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
(logical_block_size >> 9));
}
/**
@ -2645,9 +2648,24 @@ static void sd_read_block_provisioning(struct scsi_disk *sdkp)
static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
{
if (scsi_report_opcode(sdkp->device, buffer, SD_BUF_SIZE,
WRITE_SAME_16))
struct scsi_device *sdev = sdkp->device;
if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
sdev->no_report_opcodes = 1;
/* Disable WRITE SAME if REPORT SUPPORTED OPERATION
* CODES is unsupported and the device has an ATA
* Information VPD page (SAT).
*/
if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE))
sdev->no_write_same = 1;
}
if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
sdkp->ws16 = 1;
if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
sdkp->ws10 = 1;
}
static int sd_try_extended_inquiry(struct scsi_device *sdp)

1
drivers/scsi/sd.h
View File

@ -84,6 +84,7 @@ struct scsi_disk {
unsigned lbpws : 1;
unsigned lbpws10 : 1;
unsigned lbpvpd : 1;
unsigned ws10 : 1;
unsigned ws16 : 1;
};
#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)