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authorDouglas Gilbert <dgilbert@interlog.com>2014-11-25 04:27:51 +0300
committerChristoph Hellwig <hch@lst.de>2014-11-25 17:42:56 +0300
commit0d01c5df5cd470515a88a454ba69126f4b7abdab (patch)
tree6a09abfc3527fee50ec14cfb28c5a3c9daf2ee2b /drivers/scsi/scsi_debug.c
parent817fd66beb779dbbe44c46dd11e64d8275efb593 (diff)
downloadlinux-0d01c5df5cd470515a88a454ba69126f4b7abdab.tar.xz
scsi_debug: add Capacity Changed Unit Attention
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>
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
-rw-r--r--drivers/scsi/scsi_debug.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index d337eaa128d0..ee99aca92bca 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -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;