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WRITE SAME command improvements

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Prepared with help from Sushma Gurram <Sushma.Gurram@sandisk.com>



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@6586 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2015-11-06 03:54:23 +00:00
parent 2b202209ca
commit daee4dcb7e
7 changed files with 396 additions and 116 deletions
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usr/fileio/common.c
+36
View File
@@ -47,6 +47,7 @@ static int exec_fsync(struct vdisk_cmd *vcmd);
static void exec_read(struct vdisk_cmd *vcmd, loff_t loff);
static void exec_write(struct vdisk_cmd *vcmd, loff_t loff);
static void exec_verify(struct vdisk_cmd *vcmd, loff_t loff);
static void exec_write_same(struct vdisk_cmd *vcmd);
static int open_dev_fd(struct vdisk_dev *dev)
{
@@ -408,6 +409,10 @@ static int do_exec(struct vdisk_cmd *vcmd)
case READ_CAPACITY:
exec_read_capacity(vcmd);
break;
case WRITE_SAME_10:
case WRITE_SAME_16:
exec_write_same(vcmd);
break;
case SERVICE_ACTION_IN_16:
if ((cmd->cdb[1] & 0x1f) == SAI_READ_CAPACITY_16)
exec_read_capacity16(vcmd);
@@ -1761,3 +1766,34 @@ out:
TRACE_EXIT();
return;
}
static void exec_write_same(struct vdisk_cmd *vcmd)
{
struct vdisk_dev *dev = vcmd->dev;
struct scst_user_scsi_cmd_exec *cmd = &vcmd->cmd->exec_cmd;
struct scst_user_scsi_cmd_reply_exec *reply = &vcmd->reply->exec_reply;
uint64_t blocks = cmd->data_len >> dev->block_shift;
static struct scst_user_data_descriptor uwhere[3];
TRACE_ENTRY();
if (blocks < 2)
goto out;
/* It's only a debug code, so it's OK to use static descr */
memset(uwhere, 0, sizeof(uwhere));
uwhere[0].usdd_lba = cmd->lba;
uwhere[0].usdd_blocks = 1;
uwhere[1].usdd_lba = cmd->lba+1;
uwhere[1].usdd_blocks = blocks-1;
reply->reply_type = SCST_EXEC_REPLY_DO_WRITE_SAME;
reply->ws_descriptors_len = sizeof(uwhere);
reply->ws_descriptors = (unsigned long)uwhere;
out:
TRACE_EXIT();
return;
}
usr/fileio/common.h
+4
View File
@@ -23,6 +23,10 @@
#include "debug.h"
#ifndef WRITE_SAME_10
#define WRITE_SAME_10 0x41
#endif
/* 8 byte ASCII Vendor */
#define VENDOR "SCST_USR"
/* 4 byte ASCII Product Revision Level - left aligned */