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    Subject[PATCH 5.6 010/106] afs: Fix to actually set AFS_SERVER_FL_HAVE_EPOCH
    Date
    From: David Howells <dhowells@redhat.com>

    commit 69cf3978f3ada4e54beae4ad44868b5627864884 upstream.

    AFS keeps track of the epoch value from the rxrpc protocol to note (a) when
    a fileserver appears to have restarted and (b) when different endpoints of
    a fileserver do not appear to be associated with the same fileserver
    (ie. all probes back from a fileserver from all of its interfaces should
    carry the same epoch).

    However, the AFS_SERVER_FL_HAVE_EPOCH flag that indicates that we've
    received the server's epoch is never set, though it is used.

    Fix this to set the flag when we first receive an epoch value from a probe
    sent to the filesystem client from the fileserver.

    Fixes: 3bf0fb6f33dd ("afs: Probe multiple fileservers simultaneously")
    Signed-off-by: David Howells <dhowells@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/afs/cmservice.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/afs/cmservice.c
    +++ b/fs/afs/cmservice.c
    @@ -169,7 +169,7 @@ static int afs_record_cm_probe(struct af

    spin_lock(&server->probe_lock);

    - if (!test_bit(AFS_SERVER_FL_HAVE_EPOCH, &server->flags)) {
    + 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;

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