aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorKai Makisara <Kai.Makisara@kolumbus.fi>2008-02-24 22:29:12 +0200
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-04-07 12:15:40 -0500
commitb174be02f3634460ac215d249617dee5ae446ae1 (patch)
tree6e62d2ff4b3c1cdfe2b36213992bd986ca9a5654
parent40f6b36c6243462fb95d0343237331c423494b03 (diff)
[SCSI] st: show options currently set in sysfs
Show the current binary tape driver and mode options is sysfs. A file (options) is created in each directory in /sys/class/scsi_tape. The files contain masks showing the options. The mask bit definitions are the same as used when setting the options using the MTSETDRVBUFFER function in the MTIOCTOP ioctl (defined in include/linux/mtio.h). For example: > cat /sys/class/scsi_tape/nst0/options 0x00000d07 [jejb: updated doc with correction from Randy Dunlap] Signed-off-by: Kai Makisara <kai.makisara@kolumbus.fi> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--Documentation/scsi/st.txt7
-rw-r--r--drivers/scsi/st.c43
2 files changed, 49 insertions, 1 deletions
diff --git a/Documentation/scsi/st.txt b/Documentation/scsi/st.txt
index 38f81188def..40752602c05 100644
--- a/Documentation/scsi/st.txt
+++ b/Documentation/scsi/st.txt
@@ -2,7 +2,7 @@ This file contains brief information about the SCSI tape driver.
The driver is currently maintained by Kai Mäkisara (email
Kai.Makisara@kolumbus.fi)
-Last modified: Thu Feb 21 21:54:16 2008 by kai.makisara
+Last modified: Sun Feb 24 21:59:07 2008 by kai.makisara
BASICS
@@ -133,6 +133,11 @@ the defaults set by the user. The value -1 means the default is not set. The
file 'dev' contains the device numbers corresponding to this device. The links
'device' and 'driver' point to the SCSI device and driver entries.
+Each directory also contains the entry 'options' which shows the currently
+enabled driver and mode options. The value in the file is a bit mask where the
+bit definitions are the same as those used with MTSETDRVBUFFER in setting the
+options.
+
A link named 'tape' is made from the SCSI device directory to the class
directory corresponding to the mode 0 auto-rewind device (e.g., st0).
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index a4361a8c6ac..d204aad2e68 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,