block/blkio: Make driver nvme-io_uring take a "path" instead of a "fi…

…lename"

The nvme-io_uring driver expects a character special file such as
/dev/ng0n1. Follow the convention of having a "filename" option when a
regular file is expected, and a "path" option otherwise.

This makes io_uring the only libblkio-based driver with a "filename"
option, as it accepts a regular file (even though it can also take a
block special file).

Signed-off-by: Alberto Faria <afaria@redhat.com>
Message-id: 20221028233854.839933-1-afaria@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block/blkio.c

@@ -640,12 +640,17 @@ static int blkio_io_uring_open(BlockDriverState *bs, QDict *options, int flags,
 static int blkio_nvme_io_uring(BlockDriverState *bs, QDict *options, int flags,
                                Error **errp)
 {
-    const char *filename = qdict_get_str(options, "filename");
+    const char *path = qdict_get_try_str(options, "path");
     BDRVBlkioState *s = bs->opaque;
     int ret;
 
-    ret = blkio_set_str(s->blkio, "path", filename);
-    qdict_del(options, "filename");
+    if (!path) {
+        error_setg(errp, "missing 'path' option");
+        return -EINVAL;
+    }
+
+    ret = blkio_set_str(s->blkio, "path", path);
+    qdict_del(options, "path");
     if (ret < 0) {
         error_setg_errno(errp, -ret, "failed to set path: %s",
                          blkio_get_error_msg());
@@ -1016,7 +1021,6 @@ static BlockDriver bdrv_io_uring = BLKIO_DRIVER(
 
 static BlockDriver bdrv_nvme_io_uring = BLKIO_DRIVER(
     DRIVER_NVME_IO_URING,
-    .bdrv_needs_filename = true,
 );
 
 static BlockDriver bdrv_virtio_blk_vfio_pci = BLKIO_DRIVER(

qapi/block-core.json

@@ -3704,12 +3704,12 @@
 #
 # Driver specific block device options for the nvme-io_uring backend.
 #
-# @filename: path to the image file
+# @path: path to the image file
 #
 # Since: 7.2
 ##
 { 'struct': 'BlockdevOptionsNvmeIoUring',
-  'data': { 'filename': 'str' },
+  'data': { 'path': 'str' },
   'if': 'CONFIG_BLKIO' }
 
 ##