libblock: Change bdbuf API

The functions
 o rtems_bdbuf_get(),
 o rtems_bdbuf_read(),
 o rtems_bdbuf_syncdev(), and
 o rtems_bdbuf_purge_dev(),
use now the disk device instead of the device identifier.  This makes
bdbuf independent of rtems_disk_obtain() and rtems_disk_release().  It
is the responsiblity of the file system to obtain the disk device.  This
also reduces the overhead to get a buffer.

The key for the AVL tree uses now the disk device instead of the device
identifier.  The pointer is interpreted as an unsigned integer.  This
reduces the memory overhead and makes the comparison operation a bit
faster.

Removed function rtems_bdbuf_purge_major().  This function was too
destructive and could have unpredictable side effects.

1 files changed, 9 insertions, 1 deletions

diff --git a/testsuites/libtests/block08/bdbuf_tests.c b/testsuites/libtests/block08/bdbuf_tests.c
index bc6b772fb2..f265a094c1 100644
--- a/testsuites/libtests/block08/bdbuf_tests.c
+++ b/testsuites/libtests/block08/bdbuf_tests.c
@@ -49,7 +49,7 @@ struct bdbuf_test_descr {
 #define TEST_SEM_ATTRIBS RTEMS_DEFAULT_ATTRIBUTES
 
 /** Device ID used for testing */
-dev_t      test_dev = (dev_t)-1;
+const rtems_disk_device *test_dd = NULL;
 
 /** Test result variable */
 bool       good_test_result = true;
@@ -108,6 +108,7 @@ run_bdbuf_tests()
     rtems_disk_device  *disk;
     rtems_status_code   sc;
     dev_t               dev = -1;
+    dev_t               test_dev;
     unsigned int        i;
 
     rtems_device_major_number  major;
@@ -153,6 +154,13 @@ run_bdbuf_tests()
         return;
     }
 
+    test_dd = rtems_disk_obtain(test_dev);
+    if (test_dd == NULL)
+    {
+        printf("Failed to obtain %s disk\n", TEST_DISK_NAME);
+        return;
+    }
+
     /*
      * On initialization test disk device driver registers
      * its RX message queue, so we just need to locate it.