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Commit b57d7c01 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

scsi_debug: simple short transfer injection 



Add an option to only transfer half the data for every n-th command.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarDouglas Gilbert <dgilbert@interlog.com>
Reviewed-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent b54197c4

drivers/scsi/scsi_debug.c

+8 −0
Original line number Diff line number Diff line
@@ -130,6 +130,7 @@ static const char * scsi_debug_version_date = "20100324"; 
#define SCSI_DEBUG_OPT_DIF_ERR   32

#define SCSI_DEBUG_OPT_DIX_ERR   64

#define SCSI_DEBUG_OPT_MAC_TIMEOUT  128

#define SCSI_DEBUG_OPT_SHORT_TRANSFER	256

/* When "every_nth" > 0 then modulo "every_nth" commands:

 *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set

 *   - a RECOVERED_ERROR is simulated on successful read and write
@@ -3583,6 +3584,7 @@ int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done) 
	int inj_transport = 0;

	int inj_dif = 0;

	int inj_dix = 0;

	int inj_short = 0;

	int delay_override = 0;

	int unmap = 0;
@@ -3628,6 +3630,8 @@ int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done) 
			inj_dif = 1; /* to reads and writes below */

		else if (SCSI_DEBUG_OPT_DIX_ERR & scsi_debug_opts)

			inj_dix = 1; /* to reads and writes below */

		else if (SCSI_DEBUG_OPT_SHORT_TRANSFER & scsi_debug_opts)

			inj_short = 1;

	}



	if (devip->wlun) {
@@ -3744,6 +3748,10 @@ int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done) 
		if (scsi_debug_fake_rw)

			break;

		get_data_transfer_info(cmd, &lba, &num, &ei_lba);



		if (inj_short)

			num /= 2;



		errsts = resp_read(SCpnt, lba, num, devip, ei_lba);

		if (inj_recovered && (0 == errsts)) {

			mk_sense_buffer(devip, RECOVERED_ERROR,