diff options
Diffstat (limited to 'blockdev.c')
| -rw-r--r-- | blockdev.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/blockdev.c b/blockdev.c index 78b927f045..1cbcc1c785 100644 --- a/blockdev.c +++ b/blockdev.c @@ -343,6 +343,7 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts, QemuOpts *opts; const char *id; bool has_driver_specific_opts; + BlockdevDetectZeroesOptions detect_zeroes; BlockDriver *drv = NULL; /* Check common options by copying from bs_opts to opts, all other options @@ -471,6 +472,24 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts, } } + detect_zeroes = + parse_enum_option(BlockdevDetectZeroesOptions_lookup, + qemu_opt_get(opts, "detect-zeroes"), + BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX, + BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, + &error); + if (error) { + error_propagate(errp, error); + goto early_err; + } + + if (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"); + goto early_err; + } + /* init */ dinfo = g_malloc0(sizeof(*dinfo)); dinfo->id = g_strdup(qemu_opts_id(opts)); @@ -481,6 +500,7 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts, } dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0; dinfo->bdrv->read_only = ro; + dinfo->bdrv->detect_zeroes = detect_zeroes; dinfo->refcount = 1; if (serial != NULL) { dinfo->serial = g_strdup(serial); @@ -2474,6 +2494,10 @@ QemuOptsList qemu_common_drive_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 */ } }, |