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Set MAXIMUM WRITE SAME LENGTH

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4547 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2012-10-04 22:08:02 +00:00
parent 05bff10f05
commit 8828cfe315
1 changed files with 7 additions and 0 deletions
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7
scst/src/dev_handlers/scst_vdisk.c
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@@ -2285,11 +2285,13 @@ static enum compl_status_e vdisk_exec_inquiry(struct vdisk_cmd_params *p)
buf[3] = 0x3C;
/* Optimal transfer granuality is PAGE_SIZE */
put_unaligned_be16(max_t(int, PAGE_SIZE/dev->block_size, 1), &buf[6]);
/* Max transfer len is min of sg limit and 8M */
max_transfer = min_t(int,
cmd->tgt_dev->max_sg_cnt << PAGE_SHIFT,
8*1024*1024) / dev->block_size;
put_unaligned_be32(max_transfer, &buf[8]);
/*
* Let's have optimal transfer len 512KB. Better to not
* set it at all, because we don't have such limit,
@@ -2300,6 +2302,7 @@ static enum compl_status_e vdisk_exec_inquiry(struct vdisk_cmd_params *p)
put_unaligned_be32(min_t(int,
max_transfer, 512*1024 / dev->block_size),
&buf[12]);
if (virt_dev->thin_provisioned) {
uint32_t gran = 1, align = 0, max_lba = 1;
@@ -2324,6 +2327,10 @@ static enum compl_status_e vdisk_exec_inquiry(struct vdisk_cmd_params *p)
buf[32] |= 0x80;
}
}
/* MAXIMUM WRITE SAME LENGTH (512MB) */
put_unaligned_be64((512*1024*1024) >> dev->block_shift, &buf[36]);
resp_len = buf[3] + 4;
} else if ((0xB1 == cmd->cdb[2]) && (dev->type == TYPE_DISK)) {
/* Block Device Characteristics */