@@ -53,3 +53,4 @@ the operation of that feature.
* 2.12: NBD_CMD_BLOCK_STATUS for "base:allocation"
* 3.0: NBD_OPT_STARTTLS with TLS Pre-Shared Keys (PSK),
NBD_CMD_BLOCK_STATUS for "qemu:dirty-bitmap:", NBD_CMD_CACHE
+* 4.2: NBD_FLAG_CAN_MULTI_CONN for sharable read-only exports
@@ -326,7 +326,7 @@ typedef struct NBDClient NBDClient;
NBDExport *nbd_export_new(BlockDriverState *bs, uint64_t dev_offset,
uint64_t size, const char *name, const char *desc,
- const char *bitmap, uint16_t nbdflags,
+ const char *bitmap, uint16_t nbdflags, bool shared,
void (*close)(NBDExport *), bool writethrough,
BlockBackend *on_eject_blk, Error **errp);
void nbd_export_close(NBDExport *exp);
@@ -188,7 +188,7 @@ void qmp_nbd_server_add(const char *device, bool has_name, const char *name,
}
exp = nbd_export_new(bs, 0, len, name, NULL, bitmap,
- writable ? 0 : NBD_FLAG_READ_ONLY,
+ writable ? 0 : NBD_FLAG_READ_ONLY, !writable,
NULL, false, on_eject_blk, errp);
if (!exp) {
return;
@@ -1461,7 +1461,7 @@ static void nbd_eject_notifier(Notifier *n, void *data)
NBDExport *nbd_export_new(BlockDriverState *bs, uint64_t dev_offset,
uint64_t size, const char *name, const char *desc,
- const char *bitmap, uint16_t nbdflags,
+ const char *bitmap, uint16_t nbdflags, bool shared,
void (*close)(NBDExport *), bool writethrough,
BlockBackend *on_eject_blk, Error **errp)
{
@@ -1487,6 +1487,8 @@ NBDExport *nbd_export_new(BlockDriverState *bs, uint64_t dev_offset,
perm = BLK_PERM_CONSISTENT_READ;
if ((nbdflags & NBD_FLAG_READ_ONLY) == 0) {
perm |= BLK_PERM_WRITE;
+ } else if (shared) {
+ nbdflags |= NBD_FLAG_CAN_MULTI_CONN;
}
blk = blk_new(bdrv_get_aio_context(bs), perm,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
@@ -1173,7 +1173,7 @@ int main(int argc, char **argv)
}
export = nbd_export_new(bs, dev_offset, fd_size, export_name,
- export_description, bitmap, nbdflags,
+ export_description, bitmap, nbdflags, shared > 1,
nbd_export_closed, writethrough, NULL,
&error_fatal);