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block: Require auto-read-only for existing fallbacks

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Some block drivers have traditionally changed their node to read-only
mode without asking the user. This behaviour has been marked deprecated
since 2.11, expecting users to provide an explicit read-only=on option.

Now that we have auto-read-only=on, enable these drivers to make use of
the option.

This is the only use of bdrv_set_read_only(), so we can make it a bit
more specific and turn it into a bdrv_apply_auto_read_only() that is
more convenient for drivers to use.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2018-10-12 11:27:41 +02:00
parent a51b9c4862
commit eaa2410f1e
7 changed files with 51 additions and 68 deletions
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15
block/rbd.c
View file

@ -780,17 +780,10 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
/* If we are using an rbd snapshot, we must be r/o, otherwise
* leave as-is */
if (s->snap != NULL) {
if (!bdrv_is_read_only(bs)) {
error_report("Opening rbd snapshots without an explicit "
"read-only=on option is deprecated. Future versions "
"will refuse to open the image instead of "
"automatically marking the image read-only.");
r = bdrv_set_read_only(bs, true, &local_err);
if (r < 0) {
rbd_close(s->image);
error_propagate(errp, local_err);
goto failed_open;
}
r = bdrv_apply_auto_read_only(bs, "rbd snapshots are read-only", errp);
if (r < 0) {
rbd_close(s->image);
goto failed_open;
}
}