afs: Make use of the YFS service upgrade to fully support IPv6
YFS VL servers offer an upgraded Volume Location service that can return
IPv6 addresses to fileservers and volume servers in addition to IPv4
addresses using the YFSVL.GetEndpoints operation which we should use if
it's available.
To this end:
(1) Make rxrpc_kernel_recv_data() return the call's current service ID so
that the caller can detect service upgrade and see what the service
was upgraded to.
(2) When we see a VL server address we haven't seen before, send a
VL.GetCapabilities operation to it with the service upgrade bit set.
If we get an upgrade to the YFS VL service, change the service ID in
the address list for that address to use the upgraded service and set
a flag to note that this appears to be a YFS-compatible server.
(3) If, when a server's addresses are being looked up, we note that we
previously detected a YFS-compatible server, then send the
YFSVL.GetEndpoints operation rather than VL.GetAddrsU.
(4) Build a fileserver address list from the reply of YFSVL.GetEndpoints,
including both IPv4 and IPv6 addresses. Volume server addresses are
discarded.
(5) The address list is sorted by address and port now, instead of just
address. This allows multiple servers on the same host sitting on
different ports.
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 1fadf40..767317b 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -70,6 +70,8 @@ struct afs_addr_list {
unsigned short nr_addrs;
unsigned short index; /* Address currently in use */
unsigned short nr_ipv4; /* Number of IPv4 addresses */
+ unsigned long probed; /* Mask of servers that have been probed */
+ unsigned long yfs; /* Mask of servers that are YFS */
struct sockaddr_rxrpc addrs[];
};
@@ -113,7 +115,7 @@ struct afs_call {
bool async; /* T if asynchronous */
bool ret_reply0; /* T if should return reply[0] on success */
bool upgrade; /* T to request service upgrade */
- u16 service_id; /* RxRPC service ID to call */
+ u16 service_id; /* Actual service ID (after upgrade) */
u32 operation_ID; /* operation ID for an incoming call */
u32 count; /* count for use in unmarshalling */
__be32 tmp; /* place to extract temporary data */
@@ -564,7 +566,8 @@ extern bool afs_iterate_addresses(struct afs_addr_cursor *);
extern int afs_end_cursor(struct afs_addr_cursor *);
extern int afs_set_vl_cursor(struct afs_addr_cursor *, struct afs_cell *);
-extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32);
+extern void afs_merge_fs_addr4(struct afs_addr_list *, __be32, u16);
+extern void afs_merge_fs_addr6(struct afs_addr_list *, __be32 *, u16);
/*
* cache.c
@@ -846,6 +849,9 @@ extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_net *,
struct key *, const char *, int);
extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_net *, struct afs_addr_cursor *,
struct key *, const uuid_t *);
+extern int afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, struct key *);
+extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_net *, struct afs_addr_cursor *,
+ struct key *, const uuid_t *);
/*
* volume.c
