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Minor max_transfer fixes

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1741 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2010-06-04 12:37:14 +00:00
parent bab336f5d5
commit efa58397a9
1 changed files with 9 additions and 6 deletions
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15
scst/src/dev_handlers/scst_vdisk.c
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@@ -1363,16 +1363,18 @@ static void vdisk_exec_inquiry(struct scst_cmd *cmd)
} else if ((0xB0 == cmd->cdb[2]) &&
(virt_dev->dev->type == TYPE_DISK)) {
/* block limits */
int max_transfer;
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]);
(uint16_t *)&buf[6]);
/* Max transfer len is min of sg limit and 8M */
put_unaligned(cpu_to_be32(min_t(int,
max_transfer = min_t(int,
cmd->tgt_dev->max_sg_cnt << PAGE_SHIFT,
8*1024*1024) / virt_dev->block_size),
8*1024*1024) / virt_dev->block_size;
put_unaligned(cpu_to_be32(max_transfer),
(uint32_t *)&buf[8]);
/*
* Let's have optimal transfer len 1MB. Better to not
@@ -1381,9 +1383,10 @@ static void vdisk_exec_inquiry(struct scst_cmd *cmd)
* 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]);
put_unaligned(cpu_to_be32(min_t(int,
max_transfer,
1*1024*1024 / virt_dev->block_size)),
(uint32_t *)&buf[12]);
resp_len = buf[3] + 4;
} else {
TRACE_DBG("INQUIRY: Unsupported EVPD page %x",