1 files changed, 43 insertions, 0 deletions

diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index a4361a8c6ac6..d204aad2e683 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -4365,6 +4365,46 @@ static ssize_t st_defcompression_show(struct class_device *class_dev, char *buf)
 
 CLASS_DEVICE_ATTR(default_compression, S_IRUGO, st_defcompression_show, NULL);
 
+static ssize_t st_options_show(struct class_device *class_dev, char *buf)
+{
+        struct st_modedef *STm = (struct st_modedef *)class_get_devdata(class_dev);
+        struct scsi_tape *STp;
+        int i, j, options;
+        ssize_t l = 0;
+
+        for (i=0; i < st_dev_max; i++) {
+                for (j=0; j < ST_NBR_MODES; j++)
+                        if (&scsi_tapes[i]->modes[j] == STm)
+                                break;
+                if (j < ST_NBR_MODES)
+                        break;
+        }
+        if (i == st_dev_max)
+                return 0;  /* should never happen */
+
+        STp = scsi_tapes[i];
+
+        options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0;
+        options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0;
+        options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0;
+        DEB( options |= debugging ? MT_ST_DEBUGGING : 0 );
+        options |= STp->two_fm ? MT_ST_TWO_FM : 0;
+        options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0;
+        options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0;
+        options |= STp->can_bsr ? MT_ST_CAN_BSR : 0;
+        options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0;
+        options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0;
+        options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0;
+        options |= STm->sysv ? MT_ST_SYSV : 0;
+        options |= STp->immediate ? MT_ST_NOWAIT : 0;
+        options |= STp->sili ? MT_ST_SILI : 0;
+
+        l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options);
+        return l;
+}
+
+CLASS_DEVICE_ATTR(options, S_IRUGO, st_options_show, NULL);
+
 static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
 {
         int i, rew, error;
@@ -4402,6 +4442,9 @@ static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
                 error = class_device_create_file(st_class_member,
                                         &class_device_attr_default_compression);
                 if (error) goto out;
+                error = class_device_create_file(st_class_member,
+                                        &class_device_attr_options);
+                if (error) goto out;
 
                 if (mode == 0 && rew == 0) {
                         error = sysfs_create_link(&STp->device->sdev_gendev.kobj,