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blockdev: Don't disable COR automatically with blockdev-add

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If a read-only device is configured with copy-on-read=on, the old code
only prints a warning and automatically disables copy on read. Make it
a real error for blockdev-add.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2013-09-19 15:12:18 +02:00
parent e34ef04641
commit 0ebd24e0a2
2 changed files with 34 additions and 6 deletions
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9
block.c
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@ -778,8 +778,13 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
}
assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */
if (!bs->read_only && (flags & BDRV_O_COPY_ON_READ)) {
bdrv_enable_copy_on_read(bs);
if (flags & BDRV_O_COPY_ON_READ) {
if (!bs->read_only) {
bdrv_enable_copy_on_read(bs);
} else {
error_setg(errp, "Can't use copy-on-read on read-only device");
return -EINVAL;
}
}
if (filename != NULL) {