@@ -765,7 +765,7 @@ static void bdrv_inherited_options(int *child_flags, QDict *child_options,
/* 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
* corresponding parent options. */
- flags |= BDRV_O_UNMAP;
+ qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap");
/* Clear flags that only apply to the top layer */
flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ |
@@ -960,6 +960,11 @@ static QemuOptsList bdrv_runtime_opts = {
.type = QEMU_OPT_STRING,
.help = "try to optimize zero writes (off, on, unmap)",
},
+ {
+ .name = "discard",
+ .type = QEMU_OPT_STRING,
+ .help = "discard operation (ignore/off, unmap/on)",
+ },
{ /* end of list */ }
},
};
@@ -976,6 +981,7 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
const char *filename;
const char *driver_name = NULL;
const char *node_name = NULL;
+ const char *discard;
const char *detect_zeroes;
QemuOpts *opts;
BlockDriver *drv;
@@ -1045,6 +1051,15 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
}
}
+ discard = qemu_opt_get(opts, "discard");
+ if (discard != NULL) {
+ if (bdrv_parse_discard_flags(discard, &bs->open_flags) != 0) {
+ error_setg(errp, "Invalid discard option");
+ ret = -EINVAL;
+ goto fail_opts;
+ }
+ }
+
detect_zeroes = qemu_opt_get(opts, "detect-zeroes");
if (detect_zeroes) {
BlockdevDetectZeroesOptions value =
@@ -356,7 +356,6 @@ static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
const char **throttling_group, ThrottleConfig *throttle_cfg,
BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
{
- const char *discard;
Error *local_error = NULL;
const char *aio;
@@ -365,13 +364,6 @@ static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
*bdrv_flags |= BDRV_O_COPY_ON_READ;
}
- if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
- if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
- error_setg(errp, "Invalid discard option");
- return;
- }
- }
-
if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
if (!strcmp(aio, "native")) {
*bdrv_flags |= BDRV_O_NATIVE_AIO;
@@ -449,15 +441,6 @@ static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
error_propagate(errp, local_error);
return;
}
-
- if (bdrv_flags &&
- *detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
- !(*bdrv_flags & BDRV_O_UNMAP))
- {
- error_setg(errp, "setting detect-zeroes to unmap is not allowed "
- "without setting discard operation to unmap");
- return;
- }
}
}
@@ -3990,10 +3973,6 @@ QemuOptsList qemu_common_drive_opts = {
.type = QEMU_OPT_BOOL,
.help = "enable/disable snapshot mode",
},{
- .name = "discard",
- .type = QEMU_OPT_STRING,
- .help = "discard operation (ignore/off, unmap/on)",
- },{
.name = "aio",
.type = QEMU_OPT_STRING,
.help = "host AIO implementation (threads, native)",
@@ -4125,10 +4104,6 @@ static QemuOptsList qemu_root_bds_opts = {
.head = QTAILQ_HEAD_INITIALIZER(qemu_root_bds_opts.head),
.desc = {
{
- .name = "discard",
- .type = QEMU_OPT_STRING,
- .help = "discard operation (ignore/off, unmap/on)",
- },{
.name = "aio",
.type = QEMU_OPT_STRING,
.help = "host AIO implementation (threads, native)",
@@ -108,6 +108,7 @@ typedef struct HDGeometry {
#define BDRV_OPT_CACHE_DIRECT "cache.direct"
#define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
#define BDRV_OPT_READ_ONLY "read-only"
+#define BDRV_OPT_DISCARD "discard"
#define BDRV_SECTOR_BITS 9