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nfsd: Add a mutex to protect the NFSv4.0 open owner replay cache

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We don't want to rely on the client_mutex 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.

Also, ensure that nfsd4_cstate_assign_replay/nfsd4_cstate_clear_replay
take a reference to the stateowner when they are using it for NFSv4.0
open and lock replay caching.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton
2014-07-29 21:34:27 -04:00
committed by J. Bruce Fields
parent 6b180f0b57
commit 58fb12e6a4
5 changed files with 41 additions and 26 deletions
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47
fs/nfsd/nfs4state.c
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@@ -1069,7 +1069,7 @@ 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)
@@ -2940,6 +2940,28 @@ 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 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;
atomic_inc(&so->so_count);
}
}
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);
nfs4_put_stateowner(so);
}
}
static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
@@ -3855,7 +3877,8 @@ out:
return status;
}
void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
struct nfsd4_open *open, __be32 status)
{
if (open->op_openowner) {
struct nfs4_openowner *oo = open->op_openowner;
@@ -3869,6 +3892,8 @@ void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
} else
oo->oo_flags &= ~NFS4_OO_NEW;
}
if (open->op_openowner)
nfsd4_cstate_assign_replay(cstate, &oo->oo_owner);
}
if (open->op_file)
nfsd4_free_file(open->op_file);
@@ -4399,8 +4424,7 @@ nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
if (status)
return status;
stp = openlockstateid(s);
if (!nfsd4_has_session(cstate))
cstate->replay_owner = stp->st_stateowner;
nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
if (!status)
@@ -4469,8 +4493,7 @@ put_stateid:
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
if (!cstate->replay_owner)
nfs4_unlock_state();
nfs4_unlock_state();
return status;
}
@@ -4544,8 +4567,7 @@ put_stateid:
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
if (!cstate->replay_owner)
nfs4_unlock_state();
nfs4_unlock_state();
return status;
}
@@ -4610,8 +4632,7 @@ nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
/* put reference from nfs4_preprocess_seqid_op */
nfs4_put_stid(&stp->st_stid);
out:
if (!cstate->replay_owner)
nfs4_unlock_state();
nfs4_unlock_state();
return status;
}
@@ -5071,8 +5092,7 @@ out:
if (status && new_state)
release_lock_stateid(lock_stp);
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)
@@ -5236,8 +5256,7 @@ put_stateid:
nfs4_put_stid(&stp->st_stid);
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;