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media-server: Add ability for retry.

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This adds the possibility to request a retry in the media-listener if an
operation failed. Usefull for example if you want to automatically
reformat a disk if it wasn't possible to mount it.
This commit is contained in:
Christian Mauderer
2020-07-09 10:21:29 +02:00
parent 9cb107c970
commit 3a95a07d88
2 changed files with 20 additions and 13 deletions
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3
cpukit/include/rtems/media.h
View File

@@ -281,6 +281,9 @@ typedef enum {
*
* @retval RTEMS_SUCCESSFUL Successful operation.
* @retval RTEMS_IO_ERROR In the inquiry state this will abort the action.
* @retval RTEMS_INCORRECT_STATE In the failed state this will cause a retry.
* Make sure to have a retry counter or similar to avoid endless loops if you
* use this value.
*/
typedef rtems_status_code (*rtems_media_listener)(
rtems_media_event event,

30
cpukit/libblock/src/media.c
View File

@@ -420,26 +420,30 @@ static rtems_status_code process_event(
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_status_code sc_retry = RTEMS_SUCCESSFUL;
rtems_media_state state = RTEMS_MEDIA_STATE_FAILED;
char *dest = NULL;
sc = notify(event, RTEMS_MEDIA_STATE_INQUIRY, src, NULL);
if (sc == RTEMS_SUCCESSFUL) {
state = RTEMS_MEDIA_STATE_READY;
} else {
state = RTEMS_MEDIA_STATE_ABORTED;
}
sc = (*worker)(state, src, &dest, worker_arg);
if (state == RTEMS_MEDIA_STATE_READY) {
do {
sc = notify(event, RTEMS_MEDIA_STATE_INQUIRY, src, NULL);
if (sc == RTEMS_SUCCESSFUL) {
state = RTEMS_MEDIA_STATE_SUCCESS;
state = RTEMS_MEDIA_STATE_READY;
} else {
state = RTEMS_MEDIA_STATE_FAILED;
state = RTEMS_MEDIA_STATE_ABORTED;
}
}
notify(event, state, src, dest);
sc = (*worker)(state, src, &dest, worker_arg);
if (state == RTEMS_MEDIA_STATE_READY) {
if (sc == RTEMS_SUCCESSFUL) {
state = RTEMS_MEDIA_STATE_SUCCESS;
} else {
state = RTEMS_MEDIA_STATE_FAILED;
}
}
sc_retry = notify(event, state, src, dest);
} while (state == RTEMS_MEDIA_STATE_FAILED
&& sc_retry == RTEMS_INCORRECT_STATE);
remember_event(event, state, src, dest);
if (state == RTEMS_MEDIA_STATE_SUCCESS) {