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-rw-r--r--block/rbd.c83
1 files changed, 56 insertions, 27 deletions
diff --git a/block/rbd.c b/block/rbd.c
index 1b78d51398..3068c829fe 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -13,35 +13,33 @@
#include "qemu-common.h"
#include "qemu-error.h"
-
#include "block_int.h"
#include <rbd/librbd.h>
-
-
/*
* When specifying the image filename use:
*
* rbd:poolname/devicename[@snapshotname][:option1=value1[:option2=value2...]]
*
- * poolname must be the name of an existing rados pool
+ * poolname must be the name of an existing rados pool.
*
- * devicename is the basename for all objects used to
- * emulate the raw device.
+ * devicename is the name of the rbd image.
*
- * 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.
+ * Each option given is used to configure rados, and may be any valid
+ * Ceph option, "id", or "conf".
*
- * Metadata information (image size, ...) is stored in an
- * object with the name "devicename.rbd".
+ * The "id" option indicates what user we should authenticate as to
+ * the Ceph cluster. If it is excluded we will use the Ceph default
+ * (normally 'admin').
*
- * The raw device is split into 4MB sized objects by default.
- * The sequencenumber is encoded in a 12 byte long hex-string,
- * and is attached to the devicename, separated by a dot.
- * e.g. "devicename.1234567890ab"
+ * The "conf" option specifies a Ceph configuration file to read. If
+ * it is not specified, we will read from the default Ceph locations
+ * (e.g., /etc/ceph/ceph.conf). To avoid reading _any_ configuration
+ * file, specify conf=/dev/null.
*
+ * Configuration values containing :, @, or = can be escaped with a
+ * leading "\".
*/
#define OBJ_MAX_SIZE (1UL << OBJ_DEFAULT_OBJ_ORDER)
@@ -104,8 +102,15 @@ static int qemu_rbd_next_tok(char *dst, int dst_len,
*p = NULL;
if (delim != '\0') {
- end = strchr(src, delim);
- if (end) {
+ for (end = src; *end; ++end) {
+ if (*end == delim) {
+ break;
+ }
+ if (*end == '\\' && end[1] != '\0') {
+ end++;
+ }
+ }
+ if (*end == delim) {
*p = end + 1;
*end = '\0';
}
@@ -124,6 +129,19 @@ static int qemu_rbd_next_tok(char *dst, int dst_len,
return 0;
}
+static void qemu_rbd_unescape(char *src)
+{
+ char *p;
+
+ for (p = src; *src; ++src, ++p) {
+ if (*src == '\\' && src[1] != '\0') {
+ src++;
+ }
+ *p = *src;
+ }
+ *p = '\0';
+}
+
static int qemu_rbd_parsename(const char *filename,
char *pool, int pool_len,
char *snap, int snap_len,
@@ -148,6 +166,7 @@ static int qemu_rbd_parsename(const char *filename,
ret = -EINVAL;
goto done;
}
+ qemu_rbd_unescape(pool);
if (strchr(p, '@')) {
ret = qemu_rbd_next_tok(name, name_len, p, '@', "object name", &p);
@@ -155,9 +174,11 @@ static int qemu_rbd_parsename(const char *filename,
goto done;
}
ret = qemu_rbd_next_tok(snap, snap_len, p, ':', "snap name", &p);
+ qemu_rbd_unescape(snap);
} else {
ret = qemu_rbd_next_tok(name, name_len, p, ':', "object name", &p);
}
+ qemu_rbd_unescape(name);
if (ret < 0 || !p) {
goto done;
}
@@ -213,6 +234,7 @@ static int qemu_rbd_set_conf(rados_t cluster, const char *conf)
if (ret < 0) {
break;
}
+ qemu_rbd_unescape(name);
if (!p) {
error_report("conf option %s has no value", name);
@@ -225,6 +247,7 @@ static int qemu_rbd_set_conf(rados_t cluster, const char *conf)
if (ret < 0) {
break;
}
+ qemu_rbd_unescape(value);
if (strcmp(name, "conf") == 0) {
ret = rados_conf_read_file(cluster, value);
@@ -298,11 +321,8 @@ static int qemu_rbd_create(const char *filename, QEMUOptionParameter *options)
}
if (strstr(conf, "conf=") == NULL) {
- if (rados_conf_read_file(cluster, NULL) < 0) {
- error_report("error reading config file");
- rados_shutdown(cluster);
- return -EIO;
- }
+ /* try default location, but ignore failure */
+ rados_conf_read_file(cluster, NULL);
}
if (conf[0] != '\0' &&
@@ -441,11 +461,8 @@ static int qemu_rbd_open(BlockDriverState *bs, const char *filename, int flags)
}
if (strstr(conf, "conf=") == NULL) {
- r = rados_conf_read_file(s->cluster, NULL);
- if (r < 0) {
- error_report("error reading config file");
- goto failed_shutdown;
- }
+ /* try default location, but ignore failure */
+ rados_conf_read_file(s->cluster, NULL);
}
if (conf[0] != '\0') {
@@ -688,6 +705,17 @@ static BlockDriverAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
}
+static int qemu_rbd_flush(BlockDriverState *bs)
+{
+#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 1)
+ /* rbd_flush added in 0.1.1 */
+ BDRVRBDState *s = bs->opaque;
+ return rbd_flush(s->image);
+#else
+ return 0;
+#endif
+}
+
static int qemu_rbd_getinfo(BlockDriverState *bs, BlockDriverInfo *bdi)
{
BDRVRBDState *s = bs->opaque;
@@ -823,6 +851,7 @@ static BlockDriver bdrv_rbd = {
.bdrv_file_open = qemu_rbd_open,
.bdrv_close = qemu_rbd_close,
.bdrv_create = qemu_rbd_create,
+ .bdrv_flush = qemu_rbd_flush,
.bdrv_get_info = qemu_rbd_getinfo,
.create_options = qemu_rbd_create_options,
.bdrv_getlength = qemu_rbd_getlength,