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ioblock.stp major/minor number patch
- From: Mike Mason <mmlnx at us dot ibm dot com>
- To: SystemTAP <systemtap at sources dot redhat dot com>
- Date: Mon, 23 Oct 2006 08:36:48 -0700
- Subject: ioblock.stp major/minor number patch
The following patch adds major/minor number functions to the ioblock tapset. I found them useful in a block IO script I'm writing. It also fixes a few misleading comments.
- Mike Mason
--- src/tapset/ioblock.stp 2006-08-15 18:54:46.000000000 -0700
+++ src.save2/tapset/ioblock.stp 2006-10-23 08:30:08.000000000 -0700
@@ -10,9 +10,10 @@
%{
#include <linux/bio.h>
#include <linux/genhd.h>
+#include <linux/kdev_t.h>
%}
-/* get i-node number of mapped file */
+/* get i-node number of device file */
function __bio_ino:long(bio:long)
%{
struct bio *bio;
@@ -113,6 +114,52 @@
}
%}
+/* returns block device major number */
+function bio_major:long(bio:long)
+%{
+ struct bio *bio;
+ struct block_device *bi_bdev;
+
+ bio = (struct bio *)(long)THIS->bio;
+ bi_bdev = (struct block_device *)deref(sizeof(bio->bi_bdev),
+ &(bio->bi_bdev));
+ if (bi_bdev == NULL) {
+ THIS->__retvalue = -1;
+ goto end;
+ }
+
+ THIS->__retvalue = MAJOR(bi_bdev->bd_dev);
+
+ if (0) {
+deref_fault:
+ CONTEXT->last_error = "pointer dereference fault";
+ }
+end: ;
+%}
+
+/* returns block device minor number */
+function bio_minor:long(bio:long)
+%{
+ struct bio *bio;
+ struct block_device *bi_bdev;
+
+ bio = (struct bio *)(long)THIS->bio;
+ bi_bdev = (struct block_device *)deref(sizeof(bio->bi_bdev),
+ &(bio->bi_bdev));
+ if (bi_bdev == NULL) {
+ THIS->__retvalue = -1;
+ goto end;
+ }
+
+ THIS->__retvalue = MINOR(bi_bdev->bd_dev);
+
+ if (0) {
+deref_fault:
+ CONTEXT->last_error = "pointer dereference fault";
+ }
+end: ;
+%}
+
global BIO_READ, BIO_WRITE
probe begin
{
@@ -129,7 +176,7 @@
*
* Variables:
* devname - block device name
- * ino - i-node number of the mapped file
+ * ino - i-node number of the device file
* sector - beginning sector for the entire bio
* flags - see below
* BIO_UPTODATE 0 ok after I/O completion
@@ -184,8 +231,8 @@
*
* Variables:
* devname - block device name
- * ino - i-node number of the mapped file
- * byte_done - number of bytes transferred
+ * ino - i-node number of the device file
+ * bytes_done - number of bytes transferred
* sector - beginning sector for the entire bio
* flags - see below
* BIO_UPTODATE 0 ok after I/O completion