On 6/5/24 11:17, Wenchao Hao wrote:
shost_for_each_device() would skip devices which is in SDEV_CANCEL or
SDEV_DEL state, for some scenarios, we donot want to skip these devices,
so add a new macro shost_for_each_device_include_deleted() to handle it.
Following changes are introduced:
1. Rework scsi_device_get(), add new helper __scsi_device_get() which
determine if skip deleted scsi_device by parameter "skip_deleted".
2. Add new parameter "skip_deleted" to __scsi_iterate_devices() which
is used when calling __scsi_device_get()
3. Update shost_for_each_device() to call __scsi_iterate_devices() with
"skip_deleted" true
4. Add new macro shost_for_each_device_include_deleted() which call
__scsi_iterate_devices() with "skip_deleted" false
Signed-off-by: Wenchao Hao <haowenchao22@xxxxxxxxx>
---
drivers/scsi/scsi.c | 46 ++++++++++++++++++++++++++------------
include/scsi/scsi_device.h | 25 ++++++++++++++++++---
2 files changed, 54 insertions(+), 17 deletions(-)
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 3e0c0381277a..5913de543d93 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -735,20 +735,18 @@ int scsi_cdl_enable(struct scsi_device *sdev, bool enable)
return 0;
}
-/**
- * scsi_device_get - get an additional reference to a scsi_device
+/*
+ * __scsi_device_get - get an additional reference to a scsi_device
* @sdev: device to get a reference to
- *
- * Description: Gets a reference to the scsi_device and increments the use count
- * of the underlying LLDD module. You must hold host_lock of the
- * parent Scsi_Host or already have a reference when calling this.
- *
- * This will fail if a device is deleted or cancelled, or when the LLD module
- * is in the process of being unloaded.
+ * @skip_deleted: when true, would return failed if device is deleted
*/
-int scsi_device_get(struct scsi_device *sdev)
+static int __scsi_device_get(struct scsi_device *sdev, bool skip_deleted)
{
- if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL)
+ /*
+ * if skip_deleted is true and device is in removing, return failed
+ */
+ if (skip_deleted &&
+ (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL))
goto fail;
Nack.
SDEV_DEL means the device is about to be deleted, so we _must not_
access it at all.
Cheers,
Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@xxxxxxx +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich
