qemu-io: don't allow I/O operations larger than BDRV_REQUEST_MAX_BYTES

[mirror_qemu.git] / qemu-img.c

diff --git a/qemu-img.c b/qemu-img.c
index ac7f40d91a1a04580a8f1e671fb686aad4209b5e..933876cfe1dc33df06a5a988b0b6a6456c5e87cf 100644 (file)
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -912,7 +912,9 @@ static int img_commit(int argc, char **argv)
     if (base) {
         base_bs = bdrv_find_backing_image(bs, base);
         if (!base_bs) {
-            error_setg(&local_err, QERR_BASE_NOT_FOUND, base);
+            error_setg(&local_err,
+                       "Did not find '%s' in the backing chain of '%s'",
+                       base, filename);
             goto done;
         }
     } else {
@@ -933,8 +935,9 @@ static int img_commit(int argc, char **argv)
 
     aio_context = bdrv_get_aio_context(bs);
     aio_context_acquire(aio_context);
-    commit_active_start("commit", bs, base_bs, 0, BLOCKDEV_ON_ERROR_REPORT,
-                        common_block_job_cb, &cbi, &local_err, false);
+    commit_active_start("commit", bs, base_bs, BLOCK_JOB_DEFAULT, 0,
+                        BLOCKDEV_ON_ERROR_REPORT, common_block_job_cb, &cbi,
+                        &local_err, false);
     aio_context_release(aio_context);
     if (local_err) {
         goto done;
@@ -3454,13 +3457,11 @@ static int img_amend(int argc, char **argv)
 
     create_opts = qemu_opts_append(create_opts, bs->drv->create_opts);
     opts = qemu_opts_create(create_opts, NULL, 0, &error_abort);
-    if (options) {
-        qemu_opts_do_parse(opts, options, NULL, &err);
-        if (err) {
-            error_report_err(err);
-            ret = -1;
-            goto out;
-        }
+    qemu_opts_do_parse(opts, options, NULL, &err);
+    if (err) {
+        error_report_err(err);
+        ret = -1;
+        goto out;
     }
 
     /* In case the driver does not call amend_status_cb() */
@@ -3558,20 +3559,23 @@ static void bench_cb(void *opaque, int ret)
     }
 
     while (b->n > b->in_flight && b->in_flight < b->nrreq) {
+        int64_t offset = b->offset;
+        /* blk_aio_* might look for completed I/Os and kick bench_cb
+         * again, so make sure this operation is counted by in_flight
+         * and b->offset is ready for the next submission.
+         */
+        b->in_flight++;
+        b->offset += b->step;
+        b->offset %= b->image_size;
         if (b->write) {
-            acb = blk_aio_pwritev(b->blk, b->offset, b->qiov, 0,
-                                  bench_cb, b);
+            acb = blk_aio_pwritev(b->blk, offset, b->qiov, 0, bench_cb, b);
         } else {
-            acb = blk_aio_preadv(b->blk, b->offset, b->qiov, 0,
-                                 bench_cb, b);
+            acb = blk_aio_preadv(b->blk, offset, b->qiov, 0, bench_cb, b);
         }
         if (!acb) {
             error_report("Failed to issue request");
             exit(EXIT_FAILURE);
         }
-        b->in_flight++;
-        b->offset += b->step;
-        b->offset %= b->image_size;
     }
 }