From: "Ewan D. Milne" <emilne@xxxxxxxxxx>
In sd_read_capacity(), detect if the capacity is different from the
previously read value, and generate a uevent if this is the case.
Signed-off-by: Ewan D. Milne <emilne@xxxxxxxxxx>
---
drivers/scsi/scsi_lib.c | 5 ++++-
drivers/scsi/scsi_sysfs.c | 2 ++
drivers/scsi/sd.c | 9 +++++++++
include/scsi/scsi_device.h | 3 ++-
4 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 6dfb978..eba68de 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2186,7 +2186,9 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt)
case SDEV_EVT_MEDIA_CHANGE:
envp[idx++] = "SDEV_MEDIA_CHANGE=1";
break;
-
+ case SDEV_EVT_CAPACITY_CHANGE:
+ envp[idx++] = "SDEV_CAPACITY_CHANGE=1";
+ break;
default:
/* do nothing */
break;
@@ -2280,6 +2282,7 @@ struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
/* evt_type-specific initialization, if any */
switch (evt_type) {
case SDEV_EVT_MEDIA_CHANGE:
+ case SDEV_EVT_CAPACITY_CHANGE:
default:
/* do nothing */
break;
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 04c2a27..ba7da3b 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -712,6 +712,7 @@ sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
#define REF_EVT(name) &dev_attr_evt_##name.attr
DECLARE_EVT(media_change, MEDIA_CHANGE)
+DECLARE_EVT(capacity_change, CAPACITY_CHANGE)
/* Default template for device attributes. May NOT be modified */
static struct attribute *scsi_sdev_attrs[] = {
@@ -731,6 +732,7 @@ static struct attribute *scsi_sdev_attrs[] = {
&dev_attr_ioerr_cnt.attr,
&dev_attr_modalias.attr,
REF_EVT(media_change),
+ REF_EVT(capacity_change),
NULL
};
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 6f0a4c6..9f2d00a 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2017,6 +2017,15 @@ got_data:
"%u-byte physical blocks\n",
sdkp->physical_block_size);
}
+
+ /*
+ * Don't report a capacity change event unless we have a
+ * valid "old" value.
+ */
+ if (!sdkp->first_scan && (old_capacity != 0) &&
+ (old_capacity != sdkp->capacity))
+ sdev_evt_send_simple(sdp, SDEV_EVT_CAPACITY_CHANGE,
+ GFP_KERNEL);
}
/* Rescale capacity to 512-byte units */
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 6efb2e1..e4c964e 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -51,8 +51,9 @@ enum scsi_device_state {
enum scsi_device_event {
SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
+ SDEV_EVT_CAPACITY_CHANGE = 2, /* capacity has changed */
- SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE,
+ SDEV_EVT_LAST = SDEV_EVT_CAPACITY_CHANGE,
SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
};
--
1.7.11.7
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