blockjob: Add 'job_id' parameter to block_job_create()

When a new job is created, the job ID is taken from the device name of
the BDS. This patch adds a new 'job_id' parameter to let the caller
provide one instead.

This patch also verifies that the ID is always unique and well-formed.
This causes problems in a couple of places where no ID is being set,
because the BDS does not have a device name.

In the case of test_block_job_start() (from test-blockjob-txn.c) we
can simply use this new 'job_id' parameter to set the missing ID.

In the case of img_commit() (from qemu-img.c) we still don't have the
API to make commit_active_start() set the job ID, so we solve it by
setting a default value. We'll get rid of this as soon as we extend
the API.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 25 insertions, 4 deletions

diff --git a/blockjob.c b/blockjob.c
index ca2291b5c5..511c0db123 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -33,6 +33,7 @@
 #include "qapi/qmp/qerror.h"
 #include "qapi/qmp/qjson.h"
 #include "qemu/coroutine.h"
+#include "qemu/id.h"
 #include "qmp-commands.h"
 #include "qemu/timer.h"
 #include "qapi-event.h"
@@ -116,9 +117,9 @@ static void block_job_detach_aio_context(void *opaque)
     block_job_unref(job);
 }
 
-void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
-                       int64_t speed, BlockCompletionFunc *cb,
-                       void *opaque, Error **errp)
+void *block_job_create(const char *job_id, const BlockJobDriver *driver,
+                       BlockDriverState *bs, int64_t speed,
+                       BlockCompletionFunc *cb, void *opaque, Error **errp)
 {
     BlockBackend *blk;
     BlockJob *job;
@@ -129,6 +130,26 @@ void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
         return NULL;
     }
 
+    if (job_id == NULL) {
+        job_id = bdrv_get_device_name(bs);
+        /* Assign a default ID if the BDS does not have a device
+         * name. We'll get rid of this soon when we finish extending
+         * the API of all commands that create block jobs. */
+        if (job_id[0] == '\0') {
+            job_id = "default_job";
+        }
+    }
+
+    if (!id_wellformed(job_id)) {
+        error_setg(errp, "Invalid job ID '%s'", job_id);
+        return NULL;
+    }
+
+    if (block_job_get(job_id)) {
+        error_setg(errp, "Job ID '%s' already in use", job_id);
+        return NULL;
+    }
+
     blk = blk_new();
     blk_insert_bs(blk, bs);
 
@@ -139,7 +160,7 @@ void *block_job_create(const BlockJobDriver *driver, BlockDriverState *bs,
     bdrv_op_unblock(bs, BLOCK_OP_TYPE_DATAPLANE, job->blocker);
 
     job->driver        = driver;
-    job->id            = g_strdup(bdrv_get_device_name(bs));
+    job->id            = g_strdup(job_id);
     job->blk           = blk;
     job->cb            = cb;
     job->opaque        = opaque;