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block: Make filter drivers use child_of_bds

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Note that some filters have secondary children, namely blkverify (the
image to be verified) and blklogwrites (the log).  This patch does not
touch those children.

Note that for blkverify, the filtered child should not be format-probed.
While there is nothing enforcing this here, in practice, it will not be:
blkverify implements .bdrv_file_open.  The block layer ensures (and in
fact, asserts) that BDRV_O_PROTOCOL is set for every BDS whose driver
implements .bdrv_file_open.  This flag will then be bequeathed to
blkverify's children, and they will thus (by default) not be probed
either.

("By default" refers to the fact that blkverify's other child (the
non-filtered one) will have BDRV_O_PROTOCOL force-unset, because that is
what happens for all non-filtered children of non-format drivers.)

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200513110544.176672-27-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2020-05-13 13:05:36 +02:00 committed by Kevin Wolf
parent 8b1869daad
commit b3af2af43b
8 changed files with 22 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
block/blkdebug.c
View file

@ -497,7 +497,9 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
/* Open the image file */
bs->file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options, "image",
bs, &child_file, 0, false, &local_err);
bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
false, &local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);

3
block/blklogwrites.c
View file

@ -157,7 +157,8 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
}
/* Open the file */
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 0, false,
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, false,
&local_err);
if (local_err) {
ret = -EINVAL;

5
block/blkreplay.c
View file

@ -27,8 +27,9 @@ static int blkreplay_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
/* Open the image file */
bs->file = bdrv_open_child(NULL, options, "image",
bs, &child_file, 0, false, &local_err);
bs->file = bdrv_open_child(NULL, options, "image", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
false, &local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);

4
block/blkverify.c
View file

@ -125,7 +125,9 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
/* Open the raw file */
bs->file = bdrv_open_child(qemu_opt_get(opts, "x-raw"), options, "raw",
bs, &child_file, 0, false, &local_err);
bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
false, &local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);

5
block/copy-on-read.c
View file

@ -28,8 +28,9 @@
static int cor_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 0, false,
errp);
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
false, errp);
if (!bs->file) {
return -EINVAL;
}

5
block/filter-compress.c
View file

@ -30,8 +30,9 @@
static int compress_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 0, false,
errp);
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
false, errp);
if (!bs->file) {
return -EINVAL;
}

3
block/replication.c
View file

@ -90,7 +90,8 @@ static int replication_open(BlockDriverState *bs, QDict *options,
const char *mode;
const char *top_id;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 0,
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
false, errp);
if (!bs->file) {
return -EINVAL;

5
block/throttle.c
View file

@ -81,8 +81,9 @@ static int throttle_open(BlockDriverState *bs, QDict *options,
char *group;
int ret;
bs->file = bdrv_open_child(NULL, options, "file", bs,
&child_file, 0, false, errp);
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
false, errp);
if (!bs->file) {
return -EINVAL;
}