commit 45bb63ed20e02ae146336412889fe5450316a84f
The pair of bloom filtered used by delegation_blocked() was intended to block delegations on given filehandles for between 30 and 60 seconds. A new filehandle would be recorded in the "new" bit set. That would then be switch to the "old" bit set between 0 and 30 seconds later, and it would remain as the "old" bit set for 30 seconds.
Unfortunately the code intended to clear the old bit set once it reached 30 seconds old, preparing it to be the next new bit set, instead cleared the *new* bit set before switching it to be the old bit set. This means that the "old" bit set is always empty and delegations are blocked between 0 and 30 seconds.
This patch updates bd->new before clearing the set with that index, instead of afterwards.
Reported-by: Olga Kornievskaia okorniev@redhat.com Cc: stable@vger.kernel.org Fixes: 6282cd565553 ("NFSD: Don't hand out delegations for 30 seconds after recalling them.") Signed-off-by: NeilBrown neilb@suse.de Reviewed-by: Benjamin Coddington bcodding@redhat.com Reviewed-by: Jeff Layton jlayton@kernel.org Signed-off-by: Chuck Lever chuck.lever@oracle.com --- fs/nfsd/nfs4state.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 7ac644d64ab1..d45487d82d44 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -743,7 +743,8 @@ static void nfs4_free_deleg(struct nfs4_stid *stid) * When a delegation is recalled, the filehandle is stored in the "new" * filter. * Every 30 seconds we swap the filters and clear the "new" one, - * unless both are empty of course. + * unless both are empty of course. This results in delegations for a + * given filehandle being blocked for between 30 and 60 seconds. * * Each filter is 256 bits. We hash the filehandle to 32bit and use the * low 3 bytes as hash-table indices. @@ -772,9 +773,9 @@ static int delegation_blocked(struct knfsd_fh *fh) if (seconds_since_boot() - bd->swap_time > 30) { bd->entries -= bd->old_entries; bd->old_entries = bd->entries; + bd->new = 1-bd->new; memset(bd->set[bd->new], 0, sizeof(bd->set[0])); - bd->new = 1-bd->new; bd->swap_time = seconds_since_boot(); } spin_unlock(&blocked_delegations_lock);
base-commit: de2cffe297563c815c840cfa14b77a0868b61e53