diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -800,6 +800,7 @@ static void bdrv_inherited_options(int *child_flags, QDict *child_options, * the parent. */ qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); + qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); /* Inherit the read-only option from the parent if it's not set */ qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); @@ -908,6 +909,7 @@ static void bdrv_backing_options(int *child_flags, QDict *child_options, * which is only applied on the top level (BlockBackend) */ qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); + qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); /* backing files always opened read-only */ qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); @@ -1150,6 +1152,11 @@ QemuOptsList bdrv_runtime_opts = { .type = QEMU_OPT_STRING, .help = "discard operation (ignore/off, unmap/on)", }, + { + .name = BDRV_OPT_FORCE_SHARE, + .type = QEMU_OPT_BOOL, + .help = "always accept other writers (default: off)", + }, { /* end of list */ } }, }; @@ -1189,6 +1196,16 @@ static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file, drv = bdrv_find_format(driver_name); assert(drv != NULL); + bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false); + + if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) { + error_setg(errp, + BDRV_OPT_FORCE_SHARE + "=on can only be used with read-only images"); + ret = -EINVAL; + goto fail_opts; + } + if (file != NULL) { filename = blk_bs(file)->filename; } else { |