diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -930,6 +930,7 @@ static void bdrv_inherited_options(int *child_flags, QDict *child_options, /* Inherit the read-only option from the parent if it's not set */ qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); + qdict_copy_default(child_options, parent_options, BDRV_OPT_AUTO_READ_ONLY); /* Our block drivers take care to send flushes and respect unmap policy, * so we can default to enable both on lower layers regardless of the @@ -1053,6 +1054,7 @@ static void bdrv_backing_options(int *child_flags, QDict *child_options, /* backing files always opened read-only */ qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); + qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off"); flags &= ~BDRV_O_COPY_ON_READ; /* snapshot=on is handled on the top layer */ @@ -1142,6 +1144,10 @@ static void update_flags_from_options(int *flags, QemuOpts *opts) *flags |= BDRV_O_RDWR; } + assert(qemu_opt_find(opts, BDRV_OPT_AUTO_READ_ONLY)); + if (qemu_opt_get_bool_del(opts, BDRV_OPT_AUTO_READ_ONLY, false)) { + *flags |= BDRV_O_AUTO_RDONLY; + } } static void update_options_from_flags(QDict *options, int flags) @@ -1156,6 +1162,10 @@ static void update_options_from_flags(QDict *options, int flags) if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) { qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR)); } + if (!qdict_haskey(options, BDRV_OPT_AUTO_READ_ONLY)) { + qdict_put_bool(options, BDRV_OPT_AUTO_READ_ONLY, + flags & BDRV_O_AUTO_RDONLY); + } } static void bdrv_assign_node_name(BlockDriverState *bs, @@ -1329,6 +1339,11 @@ QemuOptsList bdrv_runtime_opts = { .help = "Node is opened in read-only mode", }, { + .name = BDRV_OPT_AUTO_READ_ONLY, + .type = QEMU_OPT_BOOL, + .help = "Node can become read-only if opening read-write fails", + }, + { .name = "detect-zeroes", .type = QEMU_OPT_STRING, .help = "try to optimize zero writes (off, on, unmap)", @@ -2486,6 +2501,8 @@ BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp) qdict_set_default_str(qdict, BDRV_OPT_CACHE_DIRECT, "off"); qdict_set_default_str(qdict, BDRV_OPT_CACHE_NO_FLUSH, "off"); qdict_set_default_str(qdict, BDRV_OPT_READ_ONLY, "off"); + qdict_set_default_str(qdict, BDRV_OPT_AUTO_READ_ONLY, "off"); + } bs = bdrv_open_inherit(NULL, reference, qdict, 0, NULL, NULL, errp); |