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NFSv4: Ensure we do not reuse open owner names 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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 */