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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>
master
Stefan Hajnoczi 2012-08-09 13:05:56 +01:00 committed by Kevin Wolf
parent acbe59829e
commit 058f8f16db
5 changed files with 11 additions and 4 deletions
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1
block.h
View File

@ -79,6 +79,7 @@ typedef struct BlockDevOps {
#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)

4
block/qcow2.c
View File

@ -484,8 +484,8 @@ static int qcow2_open(BlockDriverState *bs, int flags)
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);

2
block/qed.c
View File

@ -477,7 +477,7 @@ static int bdrv_qed_open(BlockDriverState *bs, int flags)
}
/* 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

2
qemu-img.c
View File

@ -379,7 +379,7 @@ static int img_check(int argc, char **argv)
BlockDriverState *bs;
BdrvCheckResult result;
int fix = 0;
int flags = BDRV_O_FLAGS;
int flags = BDRV_O_FLAGS | BDRV_O_CHECK;
fmt = NULL;
for(;;) {

6
tests/qemu-iotests/039.out
View File

@ -26,6 +26,12 @@ incompatible_features 0x1
== 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