block: add BLOCK_O_CHECK for qemu-img check
Image formats with a dirty bit, like qed and qcow2, repair dirty image
files upon open with BDRV_O_RDWR. Performing automatic repair when
qemu-img check runs is not ideal because the bdrv_open() call repairs
the image before the actual bdrv_check() call from qemu-img.c.
Fix this "double repair" since it leads to confusing output from
qemu-img check. Tell the block driver that this image is being opened
just for bdrv_check(). This skips automatic repair and qemu-img.c can
invoke it manually with bdrv_check().
Update the golden output for qemu-iotests 039 to reflect the new
qemu-img check output.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block.h b/block.h
index 650d872..2e2be11 100644
--- a/block.h
+++ b/block.h
@@ -79,6 +79,7 @@
#define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
#define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
#define BDRV_O_INCOMING 0x0800 /* consistency hint for incoming migration */
+#define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
diff --git a/block/qcow2.c b/block/qcow2.c
index 5896fd6..8f183f1 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -484,8 +484,8 @@
qemu_co_mutex_init(&s->lock);
/* Repair image if dirty */
- if ((s->incompatible_features & QCOW2_INCOMPAT_DIRTY) &&
- !bs->read_only) {
+ if (!(flags & BDRV_O_CHECK) && !bs->read_only &&
+ (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) {
BdrvCheckResult result = {0};
ret = qcow2_check(bs, &result, BDRV_FIX_ERRORS);
diff --git a/block/qed.c b/block/qed.c
index 226545d..a02dbfd 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -477,7 +477,7 @@
}
/* If image was not closed cleanly, check consistency */
- if (s->header.features & QED_F_NEED_CHECK) {
+ if (!(flags & BDRV_O_CHECK) && (s->header.features & QED_F_NEED_CHECK)) {
/* Read-only images cannot be fixed. There is no risk of corruption
* since write operations are not possible. Therefore, allow
* potentially inconsistent images to be opened read-only. This can
diff --git a/qemu-img.c b/qemu-img.c
index 94a31ad..b41e670 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -379,7 +379,7 @@
BlockDriverState *bs;
BdrvCheckResult result;
int fix = 0;
- int flags = BDRV_O_FLAGS;
+ int flags = BDRV_O_FLAGS | BDRV_O_CHECK;
fmt = NULL;
for(;;) {
diff --git a/tests/qemu-iotests/039.out b/tests/qemu-iotests/039.out
index 155a05e..cb510d6 100644
--- a/tests/qemu-iotests/039.out
+++ b/tests/qemu-iotests/039.out
@@ -26,6 +26,12 @@
== Repairing the image file must succeed ==
ERROR OFLAG_COPIED: offset=8000000000050000 refcount=0
Repairing cluster 5 refcount=0 reference=1
+The following inconsistencies were found and repaired:
+
+ 0 leaked clusters
+ 1 corruptions
+
+Double checking the fixed image now...
No errors were found on the image.
incompatible_features 0x0
