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path: root/drivers/scsi/scsi_scan.c
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-rw-r--r--drivers/scsi/scsi_scan.c44
1 files changed, 30 insertions, 14 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 97074c91e328..6c8ad36560d1 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -96,10 +96,13 @@ MODULE_PARM_DESC(max_luns,
#define SCSI_SCAN_TYPE_DEFAULT "sync"
#endif
-char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
+char scsi_scan_type[7] = SCSI_SCAN_TYPE_DEFAULT;
-module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
-MODULE_PARM_DESC(scan, "sync, async or none");
+module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type),
+ S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(scan, "sync, async, manual, or none. "
+ "Setting to 'manual' disables automatic scanning, but allows "
+ "for manual device scan via the 'scan' sysfs attribute.");
static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
@@ -1040,7 +1043,8 @@ static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
* @lun: LUN of target device
* @bflagsp: store bflags here if not NULL
* @sdevp: probe the LUN corresponding to this scsi_device
- * @rescan: if nonzero skip some code only needed on first scan
+ * @rescan: if not equal to SCSI_SCAN_INITIAL skip some code only
+ * needed on first scan
* @hostdata: passed to scsi_alloc_sdev()
*
* Description:
@@ -1055,7 +1059,8 @@ static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
**/
static int scsi_probe_and_add_lun(struct scsi_target *starget,
u64 lun, int *bflagsp,
- struct scsi_device **sdevp, int rescan,
+ struct scsi_device **sdevp,
+ enum scsi_scan_mode rescan,
void *hostdata)
{
struct scsi_device *sdev;
@@ -1069,7 +1074,7 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
*/
sdev = scsi_device_lookup_by_target(starget, lun);
if (sdev) {
- if (rescan || !scsi_device_created(sdev)) {
+ if (rescan != SCSI_SCAN_INITIAL || !scsi_device_created(sdev)) {
SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
"scsi scan: device exists on %s\n",
dev_name(&sdev->sdev_gendev)));
@@ -1205,7 +1210,8 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
* Modifies sdevscan->lun.
**/
static void scsi_sequential_lun_scan(struct scsi_target *starget,
- int bflags, int scsi_level, int rescan)
+ int bflags, int scsi_level,
+ enum scsi_scan_mode rescan)
{
uint max_dev_lun;
u64 sparse_lun, lun;
@@ -1300,7 +1306,7 @@ static void scsi_sequential_lun_scan(struct scsi_target *starget,
* 1: could not scan with REPORT LUN
**/
static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
- int rescan)
+ enum scsi_scan_mode rescan)
{
char devname[64];
unsigned char scsi_cmd[MAX_COMMAND_SIZE];
@@ -1546,7 +1552,7 @@ void scsi_rescan_device(struct device *dev)
EXPORT_SYMBOL(scsi_rescan_device);
static void __scsi_scan_target(struct device *parent, unsigned int channel,
- unsigned int id, u64 lun, int rescan)
+ unsigned int id, u64 lun, enum scsi_scan_mode rescan)
{
struct Scsi_Host *shost = dev_to_shost(parent);
int bflags = 0;
@@ -1604,7 +1610,10 @@ static void __scsi_scan_target(struct device *parent, unsigned int channel,
* @channel: channel to scan
* @id: target id to scan
* @lun: Specific LUN to scan or SCAN_WILD_CARD
- * @rescan: passed to LUN scanning routines
+ * @rescan: passed to LUN scanning routines; SCSI_SCAN_INITIAL for
+ * no rescan, SCSI_SCAN_RESCAN to rescan existing LUNs,
+ * and SCSI_SCAN_MANUAL to force scanning even if
+ * 'scan=manual' is set.
*
* Description:
* Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
@@ -1614,13 +1623,17 @@ static void __scsi_scan_target(struct device *parent, unsigned int channel,
* sequential scan of LUNs on the target id.
**/
void scsi_scan_target(struct device *parent, unsigned int channel,
- unsigned int id, u64 lun, int rescan)
+ unsigned int id, u64 lun, enum scsi_scan_mode rescan)
{
struct Scsi_Host *shost = dev_to_shost(parent);
if (strncmp(scsi_scan_type, "none", 4) == 0)
return;
+ if (rescan != SCSI_SCAN_MANUAL &&
+ strncmp(scsi_scan_type, "manual", 6) == 0)
+ return;
+
mutex_lock(&shost->scan_mutex);
if (!shost->async_scan)
scsi_complete_async_scans();
@@ -1634,7 +1647,8 @@ void scsi_scan_target(struct device *parent, unsigned int channel,
EXPORT_SYMBOL(scsi_scan_target);
static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
- unsigned int id, u64 lun, int rescan)
+ unsigned int id, u64 lun,
+ enum scsi_scan_mode rescan)
{
uint order_id;
@@ -1665,7 +1679,8 @@ static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
}
int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
- unsigned int id, u64 lun, int rescan)
+ unsigned int id, u64 lun,
+ enum scsi_scan_mode rescan)
{
SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
"%s: <%u:%u:%llu>\n",
@@ -1844,7 +1859,8 @@ void scsi_scan_host(struct Scsi_Host *shost)
{
struct async_scan_data *data;
- if (strncmp(scsi_scan_type, "none", 4) == 0)
+ if (strncmp(scsi_scan_type, "none", 4) == 0 ||
+ strncmp(scsi_scan_type, "manual", 6) == 0)
return;
if (scsi_autopm_get_host(shost) < 0)
return;