Hi,
2011/3/29 Josh Durgin <josh.durgin@xxxxxxxxxxxxx>:
> The new format is rbd:pool/image[@snapshot][:option1=value1[:option2=value2...]]
> Each option is used to configure rados, and may be any Ceph option, or "conf".
> The "conf" option specifies a Ceph configuration file to read.
>
> This allows rbd volumes from more than one Ceph cluster to be used by
> specifying different monitor addresses, as well as having different
> logging levels or locations for different volumes.
>
> Signed-off-by: Josh Durgin <josh.durgin@xxxxxxxxxxxxx>
> ---
> block/rbd.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++--------
> 1 files changed, 102 insertions(+), 17 deletions(-)
>
> diff --git a/block/rbd.c b/block/rbd.c
> index cb76dd3..bc3323d 100644
> --- a/block/rbd.c
> +++ b/block/rbd.c
> @@ -22,13 +22,17 @@
> /*
> * When specifying the image filename use:
> *
> - * rbd:poolname/devicename
> + * rbd:poolname/devicename[@snapshotname][:option1=value1[:option2=value2...]]
I'm not sure IIUC, but currently this @snapshotname seems to be
meaningless; it doesn't allow you to boot from a snapshot because it's
read only. Am I misunderstanding or tested incorrectly?
Yoshi
> *
> * poolname must be the name of an existing rados pool
> *
> * devicename is the basename for all objects used to
> * emulate the raw device.
> *
> + * Each option given is used to configure rados, and may be
> + * any Ceph option, or "conf". The "conf" option specifies
> + * a Ceph configuration file to read.
> + *
> * Metadata information (image size, ...) is stored in an
> * object with the name "devicename.rbd".
> *
> @@ -121,7 +125,8 @@ static int qemu_rbd_next_tok(char *dst, int dst_len,
> static int qemu_rbd_parsename(const char *filename,
> char *pool, int pool_len,
> char *snap, int snap_len,
> - char *name, int name_len)
> + char *name, int name_len,
> + char *conf, int conf_len)
> {
> const char *start;
> char *p, *buf;
> @@ -133,28 +138,84 @@ static int qemu_rbd_parsename(const char *filename,
>
> buf = qemu_strdup(start);
> p = buf;
> + *snap = '\0';
> + *conf = '\0';
>
> ret = qemu_rbd_next_tok(pool, pool_len, p, '/', "pool name", &p);
> if (ret < 0 || !p) {
> ret = -EINVAL;
> goto done;
> }
> - ret = qemu_rbd_next_tok(name, name_len, p, '@', "object name", &p);
> - if (ret < 0) {
> - goto done;
> +
> + if (strchr(p, '@')) {
> + ret = qemu_rbd_next_tok(name, name_len, p, '@', "object name", &p);
> + if (ret < 0) {
> + goto done;
> + }
> + ret = qemu_rbd_next_tok(snap, snap_len, p, ':', "snap name", &p);
> + } else {
> + ret = qemu_rbd_next_tok(name, name_len, p, ':', "object name", &p);
> }
> - if (!p) {
> - *snap = '\0';
> + if (ret < 0 || !p) {
> goto done;
> }
>
> - ret = qemu_rbd_next_tok(snap, snap_len, p, '\0', "snap name", &p);
> + ret = qemu_rbd_next_tok(conf, conf_len, p, '\0', "configuration", &p);
>
> done:
> qemu_free(buf);
> return ret;
> }
>
> +static int qemu_rbd_set_conf(rados_t cluster, const char *conf)
> +{
> + char *p, *buf;
> + char name[RBD_MAX_CONF_NAME_SIZE];
> + char value[RBD_MAX_CONF_VAL_SIZE];
> + int ret = 0;
> +
> + buf = qemu_strdup(conf);
> + p = buf;
> +
> + while (p) {
> + ret = qemu_rbd_next_tok(name, sizeof(name), p,
> + '=', "conf option name", &p);
> + if (ret < 0) {
> + break;
> + }
> +
> + if (!p) {
> + error_report("conf option %s has no value", name);
> + ret = -EINVAL;
> + break;
> + }
> +
> + ret = qemu_rbd_next_tok(value, sizeof(value), p,
> + ':', "conf option value", &p);
> + if (ret < 0) {
> + break;
> + }
> +
> + if (strncmp(name, "conf", strlen("conf"))) {
> + ret = rados_conf_set(cluster, name, value);
> + if (ret < 0) {
> + error_report("invalid conf option %s", name);
> + ret = -EINVAL;
> + break;
> + }
> + } else {
> + ret = rados_conf_read_file(cluster, value);
> + if (ret < 0) {
> + error_report("error reading conf file %s", value);
> + break;
> + }
> + }
> + }
> +
> + qemu_free(buf);
> + return ret;
> +}
> +
> static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options)
> {
> int64_t bytes = 0;
> @@ -163,6 +224,7 @@ static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options)
> char pool[RBD_MAX_POOL_NAME_SIZE];
> char name[RBD_MAX_IMAGE_NAME_SIZE];
> char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
> + char conf[RBD_MAX_CONF_SIZE];
> char *snap = NULL;
> rados_t cluster;
> rados_ioctx_t io_ctx;
> @@ -170,7 +232,8 @@ static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options)
>
> if (qemu_rbd_parsename(filename, pool, sizeof(pool),
> snap_buf, sizeof(snap_buf),
> - name, sizeof(name)) < 0) {
> + name, sizeof(name),
> + conf, sizeof(conf)) < 0) {
> return -EINVAL;
> }
> if (snap_buf[0] != '\0') {
> @@ -203,8 +266,17 @@ static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options)
> return -EIO;
> }
>
> - if (rados_conf_read_file(cluster, NULL) < 0) {
> - error_report("error reading config file");
> + if (strstr(conf, "conf=") == NULL) {
> + if (rados_conf_read_file(cluster, NULL) < 0) {
> + error_report("error reading config file");
> + rados_shutdown(cluster);
> + return -EIO;
> + }
> + }
> +
> + if (conf[0] != '\0' &&
> + qemu_rbd_set_conf(cluster, conf) < 0) {
> + error_report("error setting config options");
> rados_shutdown(cluster);
> return -EIO;
> }
> @@ -314,11 +386,13 @@ static int qemu_rbd_open(BlockDriverState *bs, const char *filename, int flags)
> BDRVRBDState *s = bs->opaque;
> char pool[RBD_MAX_POOL_NAME_SIZE];
> char snap_buf[RBD_MAX_SNAP_NAME_SIZE];
> + char conf[RBD_MAX_CONF_SIZE];
> int r;
>
> if (qemu_rbd_parsename(filename, pool, sizeof(pool),
> snap_buf, sizeof(snap_buf),
> - s->name, sizeof(s->name)) < 0) {
> + s->name, sizeof(s->name),
> + conf, sizeof(conf)) < 0) {
> return -EINVAL;
> }
> s->snap = NULL;
> @@ -332,11 +406,22 @@ static int qemu_rbd_open(BlockDriverState *bs, const char *filename, int flags)
> return r;
> }
>
> - r = rados_conf_read_file(s->cluster, NULL);
> - if (r < 0) {
> - error_report("error reading config file");
> - rados_shutdown(s->cluster);
> - return r;
> + if (strstr(conf, "conf=") == NULL) {
> + r = rados_conf_read_file(s->cluster, NULL);
> + if (r < 0) {
> + error_report("error reading config file");
> + rados_shutdown(s->cluster);
> + return r;
> + }
> + }
> +
> + if (conf[0] != '\0') {
> + r = qemu_rbd_set_conf(s->cluster, conf);
> + if (r < 0) {
> + error_report("error setting config options");
> + rados_shutdown(s->cluster);
> + return r;
> + }
> }
>
> r = rados_connect(s->cluster);
> --
> 1.7.2.3
>
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