[v4,23/32] blockdev: Separate qcow2 probe from its driver

Commit Message

[e-mail] July 14, 2016, 7:03 p.m. UTC

Completes the separation of the qcow2 probe from the qcow2 driver. The
qcow2 probe now returns the format in addition to the score, allowing
correlation of the score and driver without the probe function being
part of the driver itself.

Signed-off-by: Colin Lord <[e-mail]>
Reviewed-by: Max Reitz <[e-mail]>
---
 block.c               |  1 +
 block/qcow2-probe.c   | 16 +++++++++++-----
 block/qcow2.c         |  1 -
 include/block/probe.h |  3 ++-
 4 files changed, 14 insertions(+), 7 deletions(-)

Patch

diff --git a/block.c b/block.c
index f531ad0..145be9b 100644
--- a/block.c
+++ b/block.c
@@ -67,6 +67,7 @@  static BdrvProbeFunc *format_probes[] = {
     bdrv_dmg_probe,
     bdrv_parallels_probe,
     bdrv_qcow_probe,
+    bdrv_qcow2_probe,
 };
 
 static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states =
diff --git a/block/qcow2-probe.c b/block/qcow2-probe.c
index e5cd92c..b7a73c5 100644
--- a/block/qcow2-probe.c
+++ b/block/qcow2-probe.c
@@ -3,14 +3,20 @@ 
 #include "block/probe.h"
 #include "qcow2.h"
 
-int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename)
+const char *bdrv_qcow2_probe(const uint8_t *buf, int buf_size,
+                             const char *filename, int *score)
 {
+    const char *format = "qcow2";
     const QCowHeader *cow_header = (const void *)buf;
+    assert(score);
 
     if (buf_size >= sizeof(QCowHeader) &&
         be32_to_cpu(cow_header->magic) == QCOW_MAGIC &&
-        be32_to_cpu(cow_header->version) >= 2)
-        return 100;
-    else
-        return 0;
+        be32_to_cpu(cow_header->version) >= 2) {
+        *score = 100;
+        return format;
+    }
+
+    *score = 0;
+    return format;
 }
diff --git a/block/qcow2.c b/block/qcow2.c
index 17521f7..2f575d1 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3382,7 +3382,6 @@  static QemuOptsList qcow2_create_opts = {
 BlockDriver bdrv_qcow2 = {
     .format_name        = "qcow2",
     .instance_size      = sizeof(BDRVQcow2State),
-    .bdrv_probe         = qcow2_probe,
     .bdrv_open          = qcow2_open,
     .bdrv_close         = qcow2_close,
     .bdrv_reopen_prepare  = qcow2_reopen_prepare,
diff --git a/include/block/probe.h b/include/block/probe.h
index e670341..1a68cef 100644
--- a/include/block/probe.h
+++ b/include/block/probe.h
@@ -1,7 +1,6 @@ 
 #ifndef PROBE_H
 #define PROBE_H
 
-int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename);
 int bdrv_qed_probe(const uint8_t *buf, int buf_size, const char *filename);
 int raw_probe(const uint8_t *buf, int buf_size, const char *filename);
 int vdi_probe(const uint8_t *buf, int buf_size, const char *filename);
@@ -20,5 +19,7 @@  const char *bdrv_parallels_probe(const uint8_t *buf, int buf_size,
                                  const char *filename, int *score);
 const char *bdrv_qcow_probe(const uint8_t *buf, int buf_size,
                             const char *filename, int *score);
+const char *bdrv_qcow2_probe(const uint8_t *buf, int buf_size,
+                             const char *filename, int *score);
 
 #endif