We don't want to rely on the state_lock() for protection in the
case of NFSv4 open owners. Instead, we add a mutex that will
only be taken for NFSv4.0 state mutating operations, and
that will be released once the entire compound is done.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 13 +++++--------
fs/nfsd/nfs4state.c | 21 ++++++++-------------
fs/nfsd/state.h | 1 +
fs/nfsd/xdr4.h | 19 +++++++++++++++++++
4 files changed, 33 insertions(+), 21 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 480323443efe..a23da87b384e 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -470,11 +470,11 @@ out:
kfree(resfh);
}
nfsd4_cleanup_open_state(open, status);
- if (open->op_openowner && !nfsd4_has_session(cstate))
- cstate->replay_owner = &open->op_openowner->oo_owner;
+ if (open->op_openowner)
+ nfsd4_cstate_assign_replay(cstate,
+ &open->op_openowner->oo_owner);
nfsd4_bump_seqid(cstate, status);
- if (!cstate->replay_owner)
- nfs4_unlock_state();
+ nfs4_unlock_state();
return status;
}
@@ -1400,10 +1400,7 @@ encode_op:
args->ops, args->opcnt, resp->opcnt, op->opnum,
be32_to_cpu(status));
- if (cstate->replay_owner) {
- nfs4_unlock_state();
- cstate->replay_owner = NULL;
- }
+ nfsd4_cstate_clear_replay(cstate);
/* XXX Ugh, we need to get rid of this kind of special case: */
if (op->opnum == OP_READ && op->u.read.rd_filp)
fput(op->u.read.rd_filp);
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 6827e8698767..ad7d21e06c36 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -779,7 +779,7 @@ void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
return;
if (!seqid_mutating_err(ntohl(nfserr))) {
- cstate->replay_owner = NULL;
+ nfsd4_cstate_clear_replay(cstate);
return;
}
if (!so)
@@ -2601,6 +2601,7 @@ static void init_nfs4_replay(struct nfs4_replay *rp)
rp->rp_status = nfserr_serverfault;
rp->rp_buflen = 0;
rp->rp_buf = rp->rp_ibuf;
+ mutex_init(&rp->rp_mutex);
}
static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
@@ -3886,8 +3887,7 @@ nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
if (status)
return status;
*stpp = openlockstateid(s);
- if (!nfsd4_has_session(cstate))
- cstate->replay_owner = (*stpp)->st_stateowner;
+ nfsd4_cstate_assign_replay(cstate, (*stpp)->st_stateowner);
return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
}
@@ -3945,8 +3945,7 @@ nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
status = nfs_ok;
out:
nfsd4_bump_seqid(cstate, status);
- if (!cstate->replay_owner)
- nfs4_unlock_state();
+ nfs4_unlock_state();
return status;
}
@@ -4028,8 +4027,7 @@ nfsd4_open_downgrade(struct svc_rqst *rqstp,
status = nfs_ok;
out:
nfsd4_bump_seqid(cstate, status);
- if (!cstate->replay_owner)
- nfs4_unlock_state();
+ nfs4_unlock_state();
return status;
}
@@ -4086,8 +4084,7 @@ nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
}
}
out:
- if (!cstate->replay_owner)
- nfs4_unlock_state();
+ nfs4_unlock_state();
return status;
}
@@ -4495,8 +4492,7 @@ out:
if (status && new_state)
release_lockowner(lock_sop);
nfsd4_bump_seqid(cstate, status);
- if (!cstate->replay_owner)
- nfs4_unlock_state();
+ nfs4_unlock_state();
if (file_lock)
locks_free_lock(file_lock);
if (conflock)
@@ -4659,8 +4655,7 @@ nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
out:
nfsd4_bump_seqid(cstate, status);
- if (!cstate->replay_owner)
- nfs4_unlock_state();
+ nfs4_unlock_state();
if (file_lock)
locks_free_lock(file_lock);
return status;
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 83d9721d9644..80789aa5b5b4 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -330,6 +330,7 @@ struct nfs4_replay {
unsigned int rp_buflen;
char *rp_buf;
struct knfsd_fh rp_openfh;
+ struct mutex rp_mutex;
char rp_ibuf[NFSD4_REPLAY_ISIZE];
};
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 5ea7df305083..2f887c944048 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -73,6 +73,25 @@ static inline bool nfsd4_has_session(struct nfsd4_compound_state *cs)
return cs->slot != NULL;
}
+static inline void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
+ struct nfs4_stateowner *so)
+{
+ if (!nfsd4_has_session(cstate)) {
+ mutex_lock(&so->so_replay.rp_mutex);
+ cstate->replay_owner = so;
+ }
+}
+
+static inline void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
+{
+ struct nfs4_stateowner *so = cstate->replay_owner;
+
+ if (so != NULL) {
+ cstate->replay_owner = NULL;
+ mutex_unlock(&so->so_replay.rp_mutex);
+ }
+}
+
struct nfsd4_change_info {
u32 atomic;
bool change_supported;
--
1.9.0
--
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