From 44746355ccb142341f92a0c86fc2e27bfc968b40 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 27 May 2020 15:52:02 +0100 Subject: [PATCH] afs: Don't get epoch from a server because it may be ambiguous 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 Signed-off-by: David Howells --- 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 ed0fb34..954030a 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; @@ -150,49 +148,6 @@ 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 4b8ac04..9f024c1 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; }; -- 2.7.4