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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
View file

@ -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) {

31
blockdev.c
View file

@ -510,10 +510,6 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
if (ro && copy_on_read) {
error_report("warning: disabling copy_on_read on read-only drive");
}
QINCREF(bs_opts);
ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
@ -601,6 +597,18 @@ QemuOptsList qemu_legacy_drive_opts = {
.type = QEMU_OPT_STRING,
.help = "pci address (virtio only)",
},
/* Options that are passed on, but have special semantics with -drive */
{
.name = "read-only",
.type = QEMU_OPT_BOOL,
.help = "open drive file as read-only",
},{
.name = "copy-on-read",
.type = QEMU_OPT_BOOL,
.help = "copy read data from backing file into image file",
},
{ /* end of list */ }
},
};
@ -616,6 +624,7 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
int cyls, heads, secs, translation;
int max_devs, bus_id, unit_id, index;
const char *devaddr;
bool read_only, copy_on_read;
Error *local_err = NULL;
/* Change legacy command line options into QMP ones */
@ -698,6 +707,20 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
}
}
/* copy-on-read is disabled with a warning for read-only devices */
read_only = qemu_opt_get_bool(legacy_opts, "read-only", false);
copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
if (read_only && copy_on_read) {
error_report("warning: disabling copy-on-read on read-only drive");
copy_on_read = false;
}
qdict_put(bs_opts, "read-only",
qstring_from_str(read_only ? "on" : "off"));
qdict_put(bs_opts, "copy-on-read",
qstring_from_str(copy_on_read ? "on" :"off"));
/* Controller type */
value = qemu_opt_get(legacy_opts, "if");
if (value) {