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block: update in-memory backing file and format 

These are needed to print "info block" output correctly.  QCOW2 does this
because it needs it to write the header, but QED does not, and common code
is the right place to do it.

Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-04-12 14:01:02 +02:00 committed by Kevin Wolf
parent 5f3777945d
commit 469ef350e1
2 changed files with 9 additions and 13 deletions
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11
block.c
View File

@ -1459,6 +1459,7 @@ int bdrv_change_backing_file(BlockDriverState *bs,
const char *backing_file, const char *backing_fmt)
{
BlockDriver *drv = bs->drv;
int ret;
/* Backing file format doesn't make sense without a backing file */
if (backing_fmt && !backing_file) {
@ -1466,10 +1467,16 @@ int bdrv_change_backing_file(BlockDriverState *bs,
}
if (drv->bdrv_change_backing_file != NULL) {
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
} else {
return -ENOTSUP;
ret = -ENOTSUP;
}
if (ret == 0) {
pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: "");
pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: "");
}
return ret;
}
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,

11
block/stream.c
View File

@ -96,17 +96,6 @@ static void close_unused_images(BlockDriverState *top, BlockDriverState *base,
bdrv_delete(unused);
}
top->backing_hd = base;
pstrcpy(top->backing_file, sizeof(top->backing_file), "");
pstrcpy(top->backing_format, sizeof(top->backing_format), "");
if (base_id) {
pstrcpy(top->backing_file, sizeof(top->backing_file), base_id);
if (base->drv) {
pstrcpy(top->backing_format, sizeof(top->backing_format),
base->drv->format_name);
}
}
}
/*