From: Eric Blake <eblake@redhat.com>
Date: Tue, 24 Mar 2020 17:42:31 +0000 (-0500)
Subject: qcow2: List autoclear bit names in header
X-Git-Tag: v4.2.1~9
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5eca12bbada69fbef88a6557d79f016aaf3ff013;p=thirdparty%2Fqemu.git

qcow2: List autoclear bit names in header

The feature table is supposed to advertise the name of all feature
bits that we support; however, we forgot to update the table for
autoclear bits.  While at it, move the table to read-only memory in
code, and tweak the qcow2 spec to name the second autoclear bit.
Update iotests that are affected by the longer header length.

Fixes: 88ddffae
Fixes: 93c24936
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200324174233.1622067-3-eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit bb40ebce2cb0bd4bf37968074d43d5a864fb6dee)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---

diff --git a/block/qcow2.c b/block/qcow2.c
index 13e118e16f0..77edd98be6f 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2822,7 +2822,7 @@ int qcow2_update_header(BlockDriverState *bs)
 
     /* Feature table */
     if (s->qcow_version >= 3) {
-        Qcow2Feature features[] = {
+        static const Qcow2Feature features[] = {
             {
                 .type = QCOW2_FEAT_TYPE_INCOMPATIBLE,
                 .bit  = QCOW2_INCOMPAT_DIRTY_BITNR,
@@ -2843,6 +2843,16 @@ int qcow2_update_header(BlockDriverState *bs)
                 .bit  = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,
                 .name = "lazy refcounts",
             },
+            {
+                .type = QCOW2_FEAT_TYPE_AUTOCLEAR,
+                .bit  = QCOW2_AUTOCLEAR_BITMAPS_BITNR,
+                .name = "bitmaps",
+            },
+            {
+                .type = QCOW2_FEAT_TYPE_AUTOCLEAR,
+                .bit  = QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR,
+                .name = "raw external data",
+            },
         };
 
         ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE,
diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt
index af5711e5337..8510d74c807 100644
--- a/docs/interop/qcow2.txt
+++ b/docs/interop/qcow2.txt
@@ -138,7 +138,8 @@ in the description of a field.
                                 bit is unset, the bitmaps extension data must be
                                 considered inconsistent.
 
-                    Bit 1:      If this bit is set, the external data file can
+                    Bit 1:      Raw external data bit
+                                If this bit is set, the external data file can
                                 be read as a consistent standalone raw image
                                 without looking at the qcow2 metadata.
 
diff --git a/tests/qemu-iotests/031.out b/tests/qemu-iotests/031.out
index 68a74d03b99..f1941300d81 100644
--- a/tests/qemu-iotests/031.out
+++ b/tests/qemu-iotests/031.out
@@ -117,7 +117,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 Header extension:
@@ -150,7 +150,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 Header extension:
@@ -164,7 +164,7 @@ No errors were found on the image.
 
 magic                     0x514649fb
 version                   3
-backing_file_offset       0x178
+backing_file_offset       0x1d8
 backing_file_size         0x17
 cluster_bits              16
 size                      67108864
@@ -188,7 +188,7 @@ data                      'host_device'
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 Header extension:
diff --git a/tests/qemu-iotests/036.out b/tests/qemu-iotests/036.out
index e489b443866..3c19fa1edee 100644
--- a/tests/qemu-iotests/036.out
+++ b/tests/qemu-iotests/036.out
@@ -58,7 +58,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 
@@ -86,7 +86,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 *** done
diff --git a/tests/qemu-iotests/061.out b/tests/qemu-iotests/061.out
index d6a7c2af95f..f98c098b543 100644
--- a/tests/qemu-iotests/061.out
+++ b/tests/qemu-iotests/061.out
@@ -26,7 +26,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 magic                     0x514649fb
@@ -84,7 +84,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 magic                     0x514649fb
@@ -140,7 +140,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 ERROR cluster 5 refcount=0 reference=1
@@ -195,7 +195,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 magic                     0x514649fb
@@ -264,7 +264,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 read 65536/65536 bytes at offset 44040192
@@ -298,7 +298,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 ERROR cluster 5 refcount=0 reference=1
@@ -327,7 +327,7 @@ header_length             104
 
 Header extension:
 magic                     0x6803f857
-length                    192
+length                    288
 data                      <binary>
 
 read 131072/131072 bytes at offset 0