blockdev: Pull out blockdev option extraction
Extract some of the blockdev option extraction code from blockdev_init() into its own function. This simplifies blockdev_init() and will allow reusing the code in a different function added in a follow-up patch. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz
Kevin Wolf
parent
5ec18f8c83
commit
fbf8175eac
213
blockdev.c
213
blockdev.c
@ -350,25 +350,134 @@ static bool check_throttle_config(ThrottleConfig *cfg, Error **errp)
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typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
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/* All parameters but @opts are optional and may be set to NULL. */
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static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
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const char **throttling_group, ThrottleConfig *throttle_cfg,
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BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
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{
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const char *discard;
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Error *local_error = NULL;
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const char *aio;
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if (bdrv_flags) {
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if (!qemu_opt_get_bool(opts, "read-only", false)) {
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*bdrv_flags |= BDRV_O_RDWR;
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}
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if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
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*bdrv_flags |= BDRV_O_COPY_ON_READ;
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}
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if ((discard = qemu_opt_get(opts, "discard")) != NULL) {
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if (bdrv_parse_discard_flags(discard, bdrv_flags) != 0) {
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error_setg(errp, "Invalid discard option");
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return;
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}
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}
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if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
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*bdrv_flags |= BDRV_O_CACHE_WB;
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}
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if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
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*bdrv_flags |= BDRV_O_NOCACHE;
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}
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if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
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*bdrv_flags |= BDRV_O_NO_FLUSH;
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}
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if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
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if (!strcmp(aio, "native")) {
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*bdrv_flags |= BDRV_O_NATIVE_AIO;
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} else if (!strcmp(aio, "threads")) {
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/* this is the default */
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} else {
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error_setg(errp, "invalid aio option");
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return;
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}
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}
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}
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/* disk I/O throttling */
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if (throttling_group) {
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*throttling_group = qemu_opt_get(opts, "throttling.group");
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}
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if (throttle_cfg) {
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memset(throttle_cfg, 0, sizeof(*throttle_cfg));
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throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
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qemu_opt_get_number(opts, "throttling.bps-total", 0);
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throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
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qemu_opt_get_number(opts, "throttling.bps-read", 0);
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throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
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qemu_opt_get_number(opts, "throttling.bps-write", 0);
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throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
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qemu_opt_get_number(opts, "throttling.iops-total", 0);
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throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
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qemu_opt_get_number(opts, "throttling.iops-read", 0);
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throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
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qemu_opt_get_number(opts, "throttling.iops-write", 0);
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throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
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qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
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throttle_cfg->buckets[THROTTLE_BPS_READ].max =
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qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
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throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
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qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
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throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
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qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
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throttle_cfg->buckets[THROTTLE_OPS_READ].max =
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qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
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throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
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qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
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throttle_cfg->op_size =
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qemu_opt_get_number(opts, "throttling.iops-size", 0);
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if (!check_throttle_config(throttle_cfg, errp)) {
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return;
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}
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}
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if (detect_zeroes) {
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*detect_zeroes =
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qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
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qemu_opt_get(opts, "detect-zeroes"),
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BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
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BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
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&local_error);
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if (local_error) {
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error_propagate(errp, local_error);
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return;
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}
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if (bdrv_flags &&
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*detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
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!(*bdrv_flags & BDRV_O_UNMAP))
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{
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error_setg(errp, "setting detect-zeroes to unmap is not allowed "
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"without setting discard operation to unmap");
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return;
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}
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}
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}
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/* Takes the ownership of bs_opts */
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static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
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Error **errp)
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{
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const char *buf;
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int ro = 0;
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int bdrv_flags = 0;
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int on_read_error, on_write_error;
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BlockBackend *blk;
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BlockDriverState *bs;
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ThrottleConfig cfg;
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int snapshot = 0;
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bool copy_on_read;
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Error *error = NULL;
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QemuOpts *opts;
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const char *id;
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bool has_driver_specific_opts;
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BlockdevDetectZeroesOptions detect_zeroes;
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const char *throttling_group;
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BlockdevDetectZeroesOptions detect_zeroes =
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BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
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const char *throttling_group = NULL;
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/* Check common options by copying from bs_opts to opts, all other options
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* stay in bs_opts for processing by bdrv_open(). */
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@ -393,35 +502,12 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
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/* extract parameters */
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snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
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ro = qemu_opt_get_bool(opts, "read-only", 0);
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copy_on_read = qemu_opt_get_bool(opts, "copy-on-read", false);
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if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
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if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
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error_setg(errp, "invalid discard option");
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goto early_err;
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}
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}
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if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true)) {
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bdrv_flags |= BDRV_O_CACHE_WB;
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}
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if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) {
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bdrv_flags |= BDRV_O_NOCACHE;
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}
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if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) {
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bdrv_flags |= BDRV_O_NO_FLUSH;
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}
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if ((buf = qemu_opt_get(opts, "aio")) != NULL) {
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if (!strcmp(buf, "native")) {
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bdrv_flags |= BDRV_O_NATIVE_AIO;
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} else if (!strcmp(buf, "threads")) {
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/* this is the default */
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} else {
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error_setg(errp, "invalid aio option");
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goto early_err;
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}
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extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
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&detect_zeroes, &error);
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if (error) {
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error_propagate(errp, error);
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goto early_err;
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}
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if ((buf = qemu_opt_get(opts, "format")) != NULL) {
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@ -439,43 +525,6 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
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qdict_put(bs_opts, "driver", qstring_from_str(buf));
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}
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/* disk I/O throttling */
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memset(&cfg, 0, sizeof(cfg));
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cfg.buckets[THROTTLE_BPS_TOTAL].avg =
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qemu_opt_get_number(opts, "throttling.bps-total", 0);
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cfg.buckets[THROTTLE_BPS_READ].avg =
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qemu_opt_get_number(opts, "throttling.bps-read", 0);
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cfg.buckets[THROTTLE_BPS_WRITE].avg =
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qemu_opt_get_number(opts, "throttling.bps-write", 0);
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cfg.buckets[THROTTLE_OPS_TOTAL].avg =
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qemu_opt_get_number(opts, "throttling.iops-total", 0);
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cfg.buckets[THROTTLE_OPS_READ].avg =
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qemu_opt_get_number(opts, "throttling.iops-read", 0);
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cfg.buckets[THROTTLE_OPS_WRITE].avg =
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qemu_opt_get_number(opts, "throttling.iops-write", 0);
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cfg.buckets[THROTTLE_BPS_TOTAL].max =
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qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
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cfg.buckets[THROTTLE_BPS_READ].max =
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qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
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cfg.buckets[THROTTLE_BPS_WRITE].max =
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qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
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cfg.buckets[THROTTLE_OPS_TOTAL].max =
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qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
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cfg.buckets[THROTTLE_OPS_READ].max =
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qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
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cfg.buckets[THROTTLE_OPS_WRITE].max =
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qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
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cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-size", 0);
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throttling_group = qemu_opt_get(opts, "throttling.group");
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if (!check_throttle_config(&cfg, &error)) {
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error_propagate(errp, error);
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goto early_err;
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}
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on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
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if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
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on_write_error = parse_block_error_action(buf, 0, &error);
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@ -494,36 +543,12 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
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}
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}
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detect_zeroes =
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qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
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qemu_opt_get(opts, "detect-zeroes"),
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BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
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BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
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&error);
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if (error) {
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error_propagate(errp, error);
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goto early_err;
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}
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if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
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!(bdrv_flags & BDRV_O_UNMAP)) {
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error_setg(errp, "setting detect-zeroes to unmap is not allowed "
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"without setting discard operation to unmap");
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goto early_err;
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}
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if (snapshot) {
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/* always use cache=unsafe with snapshot */
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bdrv_flags &= ~BDRV_O_CACHE_MASK;
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bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH);
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}
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if (copy_on_read) {
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bdrv_flags |= BDRV_O_COPY_ON_READ;
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}
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bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
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/* init */
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if ((!file || !*file) && !has_driver_specific_opts) {
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BlockBackendRootState *blk_rs;
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@ -535,7 +560,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
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blk_rs = blk_get_root_state(blk);
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blk_rs->open_flags = bdrv_flags;
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blk_rs->read_only = ro;
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blk_rs->read_only = !(bdrv_flags & BDRV_O_RDWR);
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blk_rs->detect_zeroes = detect_zeroes;
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if (throttle_enabled(&cfg)) {
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