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block: Parse 'detect-zeroes' in bdrv_open_common()

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Amongst others, this means that you can now use the 'detect-zeroes'
option for non-top-level nodes in blockdev-add, like the QAPI schema
promises.

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 21:00:41 +02:00
parent 0a4279d97c
commit 692e01a27c
2 changed files with 34 additions and 8 deletions
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33
block.c
View File

@ -42,6 +42,7 @@
#include "qapi-event.h"
#include "qemu/cutils.h"
#include "qemu/id.h"
#include "qapi/util.h"
#ifdef CONFIG_BSD
#include <sys/ioctl.h>
@ -954,6 +955,11 @@ static QemuOptsList bdrv_runtime_opts = {
.type = QEMU_OPT_BOOL,
.help = "Node is opened in read-only mode",
},
{
.name = "detect-zeroes",
.type = QEMU_OPT_STRING,
.help = "try to optimize zero writes (off, on, unmap)",
},
{ /* end of list */ }
},
};
@ -970,6 +976,7 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
const char *filename;
const char *driver_name = NULL;
const char *node_name = NULL;
const char *detect_zeroes;
QemuOpts *opts;
BlockDriver *drv;
Error *local_err = NULL;
@ -1038,6 +1045,32 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
}
}
detect_zeroes = qemu_opt_get(opts, "detect-zeroes");
if (detect_zeroes) {
BlockdevDetectZeroesOptions value =
qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
detect_zeroes,
BLOCKDEV_DETECT_ZEROES_OPTIONS__MAX,
BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
ret = -EINVAL;
goto fail_opts;
}
if (value == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
!(bs->open_flags & BDRV_O_UNMAP))
{
error_setg(errp, "setting detect-zeroes to unmap is not allowed "
"without setting discard operation to unmap");
ret = -EINVAL;
goto fail_opts;
}
bs->detect_zeroes = value;
}
if (filename != NULL) {
pstrcpy(bs->filename, sizeof(bs->filename), filename);
} else {

9
blockdev.c
View File

@ -658,7 +658,6 @@ static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
BlockDriverState *bs;
QemuOpts *opts;
Error *local_error = NULL;
BlockdevDetectZeroesOptions detect_zeroes;
int bdrv_flags = 0;
opts = qemu_opts_create(&qemu_root_bds_opts, NULL, 1, errp);
@ -673,7 +672,7 @@ static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
}
extract_common_blockdev_options(opts, &bdrv_flags, NULL, NULL,
&detect_zeroes, &local_error);
NULL, &local_error);
if (local_error) {
error_propagate(errp, local_error);
goto fail;
@ -695,8 +694,6 @@ static BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
goto fail_no_bs_opts;
}
bs->detect_zeroes = detect_zeroes;
fail_no_bs_opts:
qemu_opts_del(opts);
return bs;
@ -4136,10 +4133,6 @@ static QemuOptsList qemu_root_bds_opts = {
.name = "copy-on-read",
.type = QEMU_OPT_BOOL,
.help = "copy read data from backing file into image file",
},{
.name = "detect-zeroes",
.type = QEMU_OPT_STRING,
.help = "try to optimize zero writes (off, on, unmap)",
},
{ /* end of list */ }
},