libceph: introduce get_osdmap_client_data_v()
Full and incremental osdmaps are structured identically and have
identical headers. Add a helper to decode both "old" (16-bit version,
v6) and "new" (8-bit struct_v+struct_compat+struct_len, v7) osdmap
enconding headers and switch to it.
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 6497322..be2a65f 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -683,6 +683,63 @@
return 0;
}
+#define OSDMAP_WRAPPER_COMPAT_VER 7
+#define OSDMAP_CLIENT_DATA_COMPAT_VER 1
+
+/*
+ * Return 0 or error. On success, *v is set to 0 for old (v6) osdmaps,
+ * to struct_v of the client_data section for new (v7 and above)
+ * osdmaps.
+ */
+static int get_osdmap_client_data_v(void **p, void *end,
+ const char *prefix, u8 *v)
+{
+ u8 struct_v;
+
+ ceph_decode_8_safe(p, end, struct_v, e_inval);
+ if (struct_v >= 7) {
+ u8 struct_compat;
+
+ ceph_decode_8_safe(p, end, struct_compat, e_inval);
+ if (struct_compat > OSDMAP_WRAPPER_COMPAT_VER) {
+ pr_warning("got v %d cv %d > %d of %s ceph_osdmap\n",
+ struct_v, struct_compat,
+ OSDMAP_WRAPPER_COMPAT_VER, prefix);
+ return -EINVAL;
+ }
+ *p += 4; /* ignore wrapper struct_len */
+
+ ceph_decode_8_safe(p, end, struct_v, e_inval);
+ ceph_decode_8_safe(p, end, struct_compat, e_inval);
+ if (struct_compat > OSDMAP_CLIENT_DATA_COMPAT_VER) {
+ pr_warning("got v %d cv %d > %d of %s ceph_osdmap client data\n",
+ struct_v, struct_compat,
+ OSDMAP_CLIENT_DATA_COMPAT_VER, prefix);
+ return -EINVAL;
+ }
+ *p += 4; /* ignore client data struct_len */
+ } else {
+ u16 version;
+
+ *p -= 1;
+ ceph_decode_16_safe(p, end, version, e_inval);
+ if (version < 6) {
+ pr_warning("got v %d < 6 of %s ceph_osdmap\n", version,
+ prefix);
+ return -EINVAL;
+ }
+
+ /* old osdmap enconding */
+ struct_v = 0;
+ }
+
+ *v = struct_v;
+ return 0;
+
+e_inval:
+ return -EINVAL;
+}
+
static int __decode_pools(void **p, void *end, struct ceph_osdmap *map,
bool incremental)
{
@@ -798,7 +855,7 @@
*/
static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
{
- u16 version;
+ u8 struct_v;
u32 epoch = 0;
void *start = *p;
u32 max;
@@ -807,15 +864,9 @@
dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));
- ceph_decode_16_safe(p, end, version, e_inval);
- if (version > 6) {
- pr_warning("got unknown v %d > 6 of osdmap\n", version);
- goto e_inval;
- }
- if (version < 6) {
- pr_warning("got old v %d < 6 of osdmap\n", version);
- goto e_inval;
- }
+ err = get_osdmap_client_data_v(p, end, "full", &struct_v);
+ if (err)
+ goto bad;
/* fsid, epoch, created, modified */
ceph_decode_need(p, end, sizeof(map->fsid) + sizeof(u32) +
@@ -943,15 +994,13 @@
__s32 new_flags, max;
void *start = *p;
int err;
- u16 version;
+ u8 struct_v;
dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));
- ceph_decode_16_safe(p, end, version, e_inval);
- if (version != 6) {
- pr_warning("got unknown v %d != 6 of inc osdmap\n", version);
- goto e_inval;
- }
+ err = get_osdmap_client_data_v(p, end, "inc", &struct_v);
+ if (err)
+ goto bad;
/* fsid, epoch, modified, new_pool_max, new_flags */
ceph_decode_need(p, end, sizeof(fsid) + sizeof(u32) + sizeof(modified) +