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block: Move 'discard' option to bdrv_open_common() 

This enables its use for nested child nodes. The compatibility
between the 'discard' and 'detect-zeroes' setting is checked in
bdrv_open_common() now as the former setting isn't available before
calling bdrv_open() any more.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2016-09-12 18:03:18 +02:00
parent b85114f8cf
commit 818584a43a
3 changed files with 17 additions and 26 deletions
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17
block.c
View File

@ -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 =

25
blockdev.c
View File

@ -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;
}
}
}
@ -3989,10 +3972,6 @@ QemuOptsList qemu_common_drive_opts = {
.name = "snapshot",
.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,
@ -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)",

1
include/block/block.h
View File

@ -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