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Experimental patch to set block limits

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1668 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2010-04-29 18:34:27 +00:00
parent a59f9a0dc6
commit 80de46bc15
1 changed files with 30 additions and 0 deletions
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30
scst/src/dev_handlers/scst_vdisk.c
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@@ -1321,6 +1321,10 @@ static void vdisk_exec_inquiry(struct scst_cmd *cmd)
buf[4] = 0x0; /* this page */
buf[5] = 0x80; /* unit serial number */
buf[6] = 0x83; /* device identification */
if (virt_dev->dev->type == TYPE_DISK) {
buf[3] += 1;
buf[7] = 0xB0; /* block limits */
}
resp_len = buf[3] + 4;
} else if (0x80 == cmd->cdb[2]) {
/* unit serial number */
@@ -1377,6 +1381,31 @@ static void vdisk_exec_inquiry(struct scst_cmd *cmd)
buf[2] = (resp_len >> 8) & 0xFF;
buf[3] = resp_len & 0xFF;
resp_len += 4;
} else if ((0xB0 == cmd->cdb[2]) &&
(virt_dev->dev->type == TYPE_DISK)) {
/* block limits */
buf[1] = 0xB0;
buf[3] = 0x1C;
/* Optimal transfer granuality is PAGE_SIZE */
put_unaligned(cpu_to_be16(max_t(int,
PAGE_SIZE/virt_dev->block_size, 1)),
(uint16_t *)&buf[6]);
/* Max transfer len is min of sg limit and 8M */
put_unaligned(cpu_to_be32(min_t(int,
cmd->tgt_dev->max_sg_cnt << PAGE_SHIFT,
8*1024*1024) / virt_dev->block_size),
(uint32_t *)&buf[8]);
/*
* Let's have optimal transfer len 1MB. Better to not
* set it at all, because we don't have such limit,
* but some initiators may not understand that (?).
* From other side, too big transfers are not optimal,
* because SGV cache supports only <4M buffers.
*/
put_unaligned(cpu_to_be32(
1*1024*1024 / virt_dev->block_size),
(uint32_t *)&buf[12]);
resp_len = buf[3] + 4;
} else {
TRACE_DBG("INQUIRY: Unsupported EVPD page %x",
cmd->cdb[2]);
@@ -1426,6 +1455,7 @@ static void vdisk_exec_inquiry(struct scst_cmd *cmd)
}
sBUG_ON(resp_len >= INQ_BUF_SZ);
if (length > resp_len)
length = resp_len;
memcpy(address, buf, length);