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NFSv4: Ensure we do not reuse open owner names

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The NFSv4 spec is ambiguous about whether or not it is permissible
to reuse open owner names, so play it safe. This patch adds a timestamp
to the state_owner structure, and combines that with the IDA based
uniquifier.
Fixes a regression whereby the Linux server returns NFS4ERR_BAD_SEQID.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-04-20 19:24:51 -04:00
parent 98a2139f4f
commit 95b72eb0bd
5 changed files with 16 additions and 8 deletions
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1
fs/nfs/nfs4_fs.h
View file

@ -59,6 +59,7 @@ struct nfs_unique_id {
#define NFS_SEQID_CONFIRMED 1
struct nfs_seqid_counter {
ktime_t create_time;
int owner_id;
int flags;
u32 counter;

6
fs/nfs/nfs4proc.c
View file

@ -838,7 +838,8 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
p->o_arg.open_flags = flags;
p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
p->o_arg.clientid = server->nfs_client->cl_clientid;
p->o_arg.id = sp->so_seqid.owner_id;
p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
p->o_arg.name = &dentry->d_name;
p->o_arg.server = server;
p->o_arg.bitmask = server->attr_bitmask;
@ -1466,8 +1467,7 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
goto unlock_no_action;
rcu_read_unlock();
}
/* Update sequence id. */
data->o_arg.id = sp->so_seqid.owner_id;
/* Update client id. */
data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];

1
fs/nfs/nfs4state.c
View file

@ -393,6 +393,7 @@ nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
static void
nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
{
sc->create_time = ktime_get();
sc->flags = 0;
sc->counter = 0;
spin_lock_init(&sc->lock);

9
fs/nfs/nfs4xdr.c
View file

@ -74,7 +74,7 @@ static int nfs4_stat_to_errno(int);
/* lock,open owner id:
* we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT >> 2)
*/
#define open_owner_id_maxsz (1 + 1 + 4)
#define open_owner_id_maxsz (1 + 2 + 1 + 1 + 2)
#define lock_owner_id_maxsz (1 + 1 + 4)
#define decode_lockowner_maxsz (1 + XDR_QUADLEN(IDMAP_NAMESZ))
#define compound_encode_hdr_maxsz (3 + (NFS4_MAXTAGLEN >> 2))
@ -1340,12 +1340,13 @@ static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_opena
*/
encode_nfs4_seqid(xdr, arg->seqid);
encode_share_access(xdr, arg->fmode);
p = reserve_space(xdr, 32);
p = reserve_space(xdr, 36);
p = xdr_encode_hyper(p, arg->clientid);
*p++ = cpu_to_be32(20);
*p++ = cpu_to_be32(24);
p = xdr_encode_opaque_fixed(p, "open id:", 8);
*p++ = cpu_to_be32(arg->server->s_dev);
xdr_encode_hyper(p, arg->id);
*p++ = cpu_to_be32(arg->id.uniquifier);
xdr_encode_hyper(p, arg->id.create_time);
}
static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)

7
include/linux/nfs_xdr.h
View file

@ -312,6 +312,11 @@ struct nfs4_layoutreturn {
int rpc_status;
};
struct stateowner_id {
__u64 create_time;
__u32 uniquifier;
};
/*
* Arguments to the open call.
*/
@ -321,7 +326,7 @@ struct nfs_openargs {
int open_flags;
fmode_t fmode;
__u64 clientid;
__u64 id;
struct stateowner_id id;
union {
struct {
struct iattr * attrs; /* UNCHECKED, GUARDED */