1 files changed, 24 insertions, 0 deletions

diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index 167daf60c4e8..d05cc4451af6 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -3,6 +3,7 @@
 
 #include <linux/rbtree.h>
 #include <linux/ceph/types.h>
+#include <linux/ceph/decode.h>
 #include <linux/ceph/ceph_fs.h>
 #include <linux/crush/crush.h>
 
@@ -119,6 +120,29 @@ static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
         return &map->osd_addr[osd];
 }
 
+static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid)
+{
+        __u8 version;
+
+        if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) {
+                pr_warning("incomplete pg encoding");
+
+                return -EINVAL;
+        }
+        version = ceph_decode_8(p);
+        if (version > 1) {
+                pr_warning("do not understand pg encoding %d > 1",
+                        (int)version);
+                return -EINVAL;
+        }
+
+        pgid->pool = ceph_decode_64(p);
+        pgid->seed = ceph_decode_32(p);
+        *p += 4;        /* skip deprecated preferred value */
+
+        return 0;
+}
+
 extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
 extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
                                             struct ceph_osdmap *map,