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[SCSI] st: show options currently set in sysfs

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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>
This commit is contained in:
Kai Makisara 2008-02-24 22:29:12 +02:00 committed by James Bottomley
parent 40f6b36c62
commit b174be02f3
2 changed files with 49 additions and 1 deletions
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7
Documentation/scsi/st.txt
View file

@ -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).

43
drivers/scsi/st.c
View file

@ -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,