Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-qa0-f53.google.com ([209.85.216.53]:37351 "EHLO mail-qa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757959AbaFSOv1 (ORCPT ); Thu, 19 Jun 2014 10:51:27 -0400 Received: by mail-qa0-f53.google.com with SMTP id j15so2018097qaq.40 for ; Thu, 19 Jun 2014 07:51:26 -0700 (PDT) From: Jeff Layton To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org Subject: [PATCH v1 020/104] NFSd: Fix delegation revocation Date: Thu, 19 Jun 2014 10:49:26 -0400 Message-Id: <1403189450-18729-21-git-send-email-jlayton@primarydata.com> In-Reply-To: <1403189450-18729-1-git-send-email-jlayton@primarydata.com> References: <1403189450-18729-1-git-send-email-jlayton@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Trond Myklebust Ensure that the delegations cannot be found by the laundromat etc once we add them to the various 'revoke' lists. Signed-off-by: Trond Myklebust --- fs/nfsd/nfs4state.c | 56 +++++++++++++++++++++++++++++++++-------------------- 1 file changed, 35 insertions(+), 21 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 6f9a0d2d0223..d708e7c807d5 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -566,13 +566,13 @@ hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp) list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations); } -/* Called under the state lock. */ static void -unhash_delegation(struct nfs4_delegation *dp) +unhash_delegation_locked(struct nfs4_delegation *dp) { struct nfs4_file *fp = dp->dl_file; - spin_lock(&state_lock); + lockdep_assert_held(&state_lock); + spin_lock(&fp->fi_lock); list_del_init(&dp->dl_perclnt); list_del_init(&dp->dl_recall_lru); @@ -580,23 +580,32 @@ unhash_delegation(struct nfs4_delegation *dp) spin_unlock(&fp->fi_lock); if (fp) nfs4_put_deleg_lease(fp); - spin_unlock(&state_lock); } +static void +unhash_delegation(struct nfs4_delegation *dp) +{ + spin_lock(&state_lock); + unhash_delegation_locked(dp); + spin_unlock(&state_lock); +} - -static void destroy_revoked_delegation(struct nfs4_delegation *dp) +static void destroy_delegation(struct nfs4_delegation *dp) { - list_del_init(&dp->dl_recall_lru); remove_stid(&dp->dl_stid); nfs4_put_delegation(dp); } -static void destroy_delegation(struct nfs4_delegation *dp) +static void unhash_and_destroy_delegation(struct nfs4_delegation *dp) { unhash_delegation(dp); - remove_stid(&dp->dl_stid); - nfs4_put_delegation(dp); + destroy_delegation(dp); +} + +static void destroy_revoked_delegation(struct nfs4_delegation *dp) +{ + list_del_init(&dp->dl_recall_lru); + destroy_delegation(dp); } static void revoke_delegation(struct nfs4_delegation *dp) @@ -604,11 +613,10 @@ static void revoke_delegation(struct nfs4_delegation *dp) struct nfs4_client *clp = dp->dl_stid.sc_client; if (clp->cl_minorversion == 0) - destroy_delegation(dp); + destroy_revoked_delegation(dp); else { - unhash_delegation(dp); dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID; - list_add(&dp->dl_recall_lru, &clp->cl_revoked); + list_move(&dp->dl_recall_lru, &clp->cl_revoked); } } @@ -1317,12 +1325,13 @@ destroy_client(struct nfs4_client *clp) spin_lock(&state_lock); while (!list_empty(&clp->cl_delegations)) { dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt); - list_del_init(&dp->dl_perclnt); - list_move(&dp->dl_recall_lru, &reaplist); + unhash_delegation_locked(dp); + list_add(&dp->dl_recall_lru, &reaplist); } spin_unlock(&state_lock); while (!list_empty(&reaplist)) { dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru); + list_del_init(&dp->dl_recall_lru); destroy_delegation(dp); } list_splice_init(&clp->cl_revoked, &reaplist); @@ -3449,7 +3458,7 @@ nfs4_open_delegation(struct net *net, struct svc_fh *fh, open->op_delegate_type = NFS4_OPEN_DELEGATE_READ; return; out_free: - destroy_delegation(dp); + unhash_and_destroy_delegation(dp); out_no_deleg: open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE; if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS && @@ -3703,7 +3712,8 @@ nfs4_laundromat(struct nfsd_net *nn) new_timeo = min(new_timeo, t); break; } - list_move(&dp->dl_recall_lru, &reaplist); + unhash_delegation_locked(dp); + list_add(&dp->dl_recall_lru, &reaplist); } spin_unlock(&state_lock); list_for_each_safe(pos, next, &reaplist) { @@ -4371,7 +4381,7 @@ nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, if (status) goto out; - destroy_delegation(dp); + unhash_and_destroy_delegation(dp); out: nfs4_unlock_state(); @@ -5190,8 +5200,10 @@ static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max, lockdep_assert_held(&state_lock); list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) { - if (victims) - list_move(&dp->dl_recall_lru, victims); + if (victims) { + unhash_delegation_locked(dp); + list_add(&dp->dl_recall_lru, victims); + } if (++count == max) break; } @@ -5440,11 +5452,13 @@ nfs4_state_shutdown_net(struct net *net) spin_lock(&state_lock); list_for_each_safe(pos, next, &nn->del_recall_lru) { dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); - list_move(&dp->dl_recall_lru, &reaplist); + unhash_delegation_locked(dp); + list_add(&dp->dl_recall_lru, &reaplist); } spin_unlock(&state_lock); list_for_each_safe(pos, next, &reaplist) { dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); + list_del_init(&dp->dl_recall_lru); destroy_delegation(dp); } -- 1.9.3