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scsi_debug: add Capacity Changed Unit Attention

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Via sysfs the virtual_gb scsi_debug parameter can be changed while
LUs are in use. If that changes, the 'Capacity data has changed'
Unit Attention is queued on all LUs.

Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Douglas Gilbert 2014-11-24 20:27:51 -05:00 committed by Christoph Hellwig
parent 817fd66beb
commit 0d01c5df5c
1 changed files with 23 additions and 3 deletions
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26
drivers/scsi/scsi_debug.c
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@ -179,7 +179,8 @@ static const char *scsi_debug_version_date = "20141022";
#define SDEBUG_UA_POR 0 /* Power on, reset, or bus device reset */
#define SDEBUG_UA_BUS_RESET 1
#define SDEBUG_UA_MODE_CHANGED 2
#define SDEBUG_NUM_UAS 3
#define SDEBUG_UA_CAPACITY_CHANGED 3
#define SDEBUG_NUM_UAS 4
/* for check_readiness() */
#define UAS_ONLY 1
@ -582,6 +583,11 @@ static int check_readiness(struct scsi_cmnd *SCpnt, int uas_only,
if (debug)
cp = "mode parameters changed";
break;
case SDEBUG_UA_CAPACITY_CHANGED:
mk_sense_buffer(SCpnt, UNIT_ATTENTION,
UA_CHANGED_ASC, CAPACITY_CHANGED_ASCQ);
if (debug)
cp = "capacity data changed";
default:
pr_warn("%s: unexpected unit attention code=%d\n",
__func__, k);
@ -3638,16 +3644,30 @@ static ssize_t virtual_gb_show(struct device_driver *ddp, char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb);
}
static ssize_t virtual_gb_store(struct device_driver *ddp, const char *buf,
size_t count)
{
int n;
int n;
bool changed;
if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
changed = (scsi_debug_virtual_gb != n);
scsi_debug_virtual_gb = n;
sdebug_capacity = get_sdebug_capacity();
if (changed) {
struct sdebug_host_info *sdhp;
struct sdebug_dev_info *dp;
list_for_each_entry(sdhp, &sdebug_host_list,
host_list) {
list_for_each_entry(dp, &sdhp->dev_info_list,
dev_list) {
set_bit(SDEBUG_UA_CAPACITY_CHANGED,
dp->uas_bm);
}
}
}
return count;
}
return -EINVAL;