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block: blockdev_init(): Call blk_set_enable_write_cache() explicitly

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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2016-03-15 15:39:42 +01:00
parent ecdd3cc82d
commit e4b24b497e
1 changed files with 9 additions and 1 deletions
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10
blockdev.c
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@ -469,6 +469,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
int bdrv_flags = 0;
int on_read_error, on_write_error;
bool account_invalid, account_failed;
bool writethrough;
BlockBackend *blk;
BlockDriverState *bs;
ThrottleConfig cfg;
@ -507,6 +508,8 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
account_invalid = qemu_opt_get_bool(opts, "stats-account-invalid", true);
account_failed = qemu_opt_get_bool(opts, "stats-account-failed", true);
writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
qdict_array_split(interval_dict, &interval_list);
@ -592,7 +595,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
/* bdrv_open() defaults to the values in bdrv_flags (for compatibility
* with other callers) rather than what we want as the real defaults.
* Apply the defaults here instead. */
qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, "on");
qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_WB, writethrough ? "off" : "on");
qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
@ -630,6 +633,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
}
}
blk_set_enable_write_cache(blk, !writethrough);
blk_set_on_error(blk, on_read_error, on_write_error);
if (!monitor_add_blk(blk, qemu_opts_id(opts), errp)) {
@ -4130,6 +4134,10 @@ QemuOptsList qemu_common_drive_opts = {
.name = "aio",
.type = QEMU_OPT_STRING,
.help = "host AIO implementation (threads, native)",
},{
.name = BDRV_OPT_CACHE_WB,
.type = QEMU_OPT_BOOL,
.help = "Enable writeback mode",
},{
.name = "format",
.type = QEMU_OPT_STRING,