[PATCH 14/27] afs: Don't get epoch from a server because it may be ambiguous

David Howells
2020-05-29T22:01:55Z

Don't get the epoch from a server, particularly one that we're looking up
by UUID, as UUIDs may be ambiguous and may map to more than one server - so
we can't draw any conclusions from it.

Reported-by: Jeffrey Altman <jaltman@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/afs/cmservice.c | 49 ++-----------------------------------------------
fs/afs/internal.h | 7 -------
2 files changed, 2 insertions(+), 54 deletions(-)

diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
index ed0fb34d77dd..954030ae7a0f 100644
--- a/fs/afs/cmservice.c
+++ b/fs/afs/cmservice.c
@@ -118,8 +118,6 @@ bool afs_cm_incoming_call(struct afs_call *call)
{
_enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);

- call->epoch = rxrpc_kernel_get_epoch(call->net->socket, call->rxcall);
-
switch (call->operation_ID) {
case CBCallBack:
call->type = &afs_SRXCBCallBack;
@@ -149,49 +147,6 @@ bool afs_cm_incoming_call(struct afs_call *call)
}
}

-/*
- * Record a probe to the cache manager from a server.
- */
-static int afs_record_cm_probe(struct afs_call *call, struct afs_server *server)
-{
- _enter("");
-
- if (test_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags) &&
- !afs_is_probing_server(server)) {
- if (server->cm_epoch == call->epoch)
- return 0;
-
- if (!server->probe.said_rebooted) {
- pr_notice("kAFS: FS rebooted %pU\n", &server->uuid);
- server->probe.said_rebooted = true;
- }
- }
-
- spin_lock(&server->probe_lock);
-
- if (!test_and_set_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags)) {
- server->cm_epoch = call->epoch;
- server->probe.cm_epoch = call->epoch;
- goto out;
- }
-
- if (server->probe.cm_probed &&
- call->epoch != server->probe.cm_epoch &&
- !server->probe.said_inconsistent) {
- pr_notice("kAFS: FS endpoints inconsistent %pU\n",
- &server->uuid);
- server->probe.said_inconsistent = true;
- }
-
- if (!server->probe.cm_probed || call->epoch == server->cm_epoch)
- server->probe.cm_epoch = server->cm_epoch;
-
-out:
- server->probe.cm_probed = true;
- spin_unlock(&server->probe_lock);
- return 0;
-}
-
/*
* Find the server record by peer address and record a probe to the cache
* manager from a server.
@@ -210,7 +165,7 @@ static int afs_find_cm_server_by_peer(struct afs_call *call)
}

call->server = server;
- return afs_record_cm_probe(call, server);
+ return 0;
}

/*
@@ -231,7 +186,7 @@ static int afs_find_cm_server_by_uuid(struct afs_call *call,
}

call->server = server;
- return afs_record_cm_probe(call, server);
+ return 0;
}

/*
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 4b8ac049fc17..9f024c1bd650 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -124,7 +124,6 @@ struct afs_call {
spinlock_t state_lock;
int error; /* error code */
u32 abort_code; /* Remote abort ID or 0 */
- u32 epoch;
unsigned int max_lifespan; /* Maximum lifespan to set if not 0 */
unsigned request_size; /* size of request data */
unsigned reply_max; /* maximum size of reply */
@@ -491,12 +490,10 @@ struct afs_server {
#define AFS_SERVER_FL_MAY_HAVE_CB 8 /* May have callbacks on this fileserver */
#define AFS_SERVER_FL_IS_YFS 9 /* Server is YFS not AFS */
#define AFS_SERVER_FL_NO_RM2 10 /* Fileserver doesn't support YFS.RemoveFile2 */
-#define AFS_SERVER_FL_HAVE_EPOCH 11 /* ->epoch is valid */
#define AFS_SERVER_FL_NEEDS_UPDATE 12 /* Fileserver address list is out of date */
atomic_t ref; /* Object refcount */
atomic_t active; /* Active user count */
u32 addr_version; /* Address list version */
- u32 cm_epoch; /* Server RxRPC epoch */
unsigned int debug_id; /* Debugging ID for traces */

/* file service access */
@@ -515,15 +512,11 @@ struct afs_server {
struct {
unsigned int rtt; /* RTT as ktime/64 */
u32 abort_code;
- u32 cm_epoch;
short error;
bool responded:1;
bool is_yfs:1;
bool not_yfs:1;
bool local_failure:1;
- bool cm_probed:1;
- bool said_rebooted:1;
- bool said_inconsistent:1;
} probe;
};