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nfs41: exchange_id operation

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Implement the exchange_id operation conforming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26

Unlike NFSv4.0, NFSv4.1 requires machine credentials. RPC_AUTH_GSS machine
credentials will be passed into the kernel at mount time to be available for
the exchange_id operation.

RPC_AUTH_UNIX root mounts can use the UNIX root credential. Store the root
credential in the nfs_client struct.

Without a credential, NFSv4.1 state renewal fails.

[nfs41: establish clientid via exchange id only if cred != NULL]
Signed-off-by: Andy Adamson<andros@umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: move nfstime4 from under CONFIG_NFS_V4_1]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: do not wait a lease time in exchange id]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: pass *session in seq_args and seq_res]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
[nfs41: Ignoring impid in decode_exchange_id is missing a READ_BUF]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: fix Xcode_exchange_id's xdr Xcoding pointer type]
[nfs41: get rid of unused struct nfs41_exchange_id_res members]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Benny Halevy 2009-04-01 09:22:29 -04:00
parent 938e101091
commit 99fe60d062
6 changed files with 247 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

61
fs/nfs/nfs4proc.c
View file

@ -48,6 +48,7 @@
#include <linux/smp_lock.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/module.h>
#include "nfs4_fs.h"
#include "delegation.h"
@ -433,11 +434,13 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
spin_unlock(&tbl->slot_tbl_lock);
slot = tbl->slots + slotid;
args->sa_session = session;
args->sa_slotid = slotid;
args->sa_cache_this = cache_reply;
dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
res->sr_session = session;
res->sr_slotid = slotid;
res->sr_renewal_time = jiffies;
/*
@ -4128,6 +4131,64 @@ int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
}
#ifdef CONFIG_NFS_V4_1
/*
* nfs4_proc_exchange_id()
*
* Since the clientid has expired, all compounds using sessions
* associated with the stale clientid will be returning
* NFS4ERR_BADSESSION in the sequence operation, and will therefore
* be in some phase of session reset.
*/
static int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
{
nfs4_verifier verifier;
struct nfs41_exchange_id_args args = {
.client = clp,
.flags = clp->cl_exchange_flags,
};
struct nfs41_exchange_id_res res = {
.client = clp,
};
int status;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
.rpc_argp = &args,
.rpc_resp = &res,
.rpc_cred = cred,
};
__be32 *p;
dprintk("--> %s\n", __func__);
BUG_ON(clp == NULL);
p = (u32 *)verifier.data;
*p++ = htonl((u32)clp->cl_boot_time.tv_sec);
*p = htonl((u32)clp->cl_boot_time.tv_nsec);
args.verifier = &verifier;
while (1) {
args.id_len = scnprintf(args.id, sizeof(args.id),
"%s/%s %u",
clp->cl_ipaddr,
rpc_peeraddr2str(clp->cl_rpcclient,
RPC_DISPLAY_ADDR),
clp->cl_id_uniquifier);
status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
if (status != NFS4ERR_CLID_INUSE)
break;
if (signalled())
break;
if (++clp->cl_id_uniquifier == 0)
break;
}
dprintk("<-- %s status= %d\n", __func__, status);
return status;
}
/* Destroy the slot table */
static void nfs4_destroy_slot_table(struct nfs4_session *session)
{

139
fs/nfs/nfs4xdr.c
View file

@ -246,6 +246,27 @@ static int nfs4_stat_to_errno(int);
(0)
#if defined(CONFIG_NFS_V4_1)
#define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
encode_verifier_maxsz + \
1 /* co_ownerid.len */ + \
XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
1 /* flags */ + \
1 /* spa_how */ + \
0 /* SP4_NONE (for now) */ + \
1 /* zero implemetation id array */)
#define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
2 /* eir_clientid */ + \
1 /* eir_sequenceid */ + \
1 /* eir_flags */ + \
1 /* spr_how */ + \
0 /* SP4_NONE (for now) */ + \
2 /* eir_server_owner.so_minor_id */ + \
/* eir_server_owner.so_major_id<> */ \
XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
/* eir_server_scope<> */ \
XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
1 /* eir_server_impl_id array length */ + \
0 /* ignored eir_server_impl_id contents */)
#define encode_sequence_maxsz 0 /* stub */
#define decode_sequence_maxsz 0 /* stub */
#else /* CONFIG_NFS_V4_1 */
@ -594,6 +615,14 @@ static int nfs4_stat_to_errno(int);
decode_putfh_maxsz + \
decode_lookup_maxsz + \
decode_fs_locations_maxsz)
#if defined(CONFIG_NFS_V4_1)
#define NFS4_enc_exchange_id_sz \
(compound_encode_hdr_maxsz + \
encode_exchange_id_maxsz)
#define NFS4_dec_exchange_id_sz \
(compound_decode_hdr_maxsz + \
decode_exchange_id_maxsz)
#endif /* CONFIG_NFS_V4_1 */
static const umode_t nfs_type2fmt[] = {
[NF4BAD] = 0,
@ -1455,7 +1484,29 @@ static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *state
hdr->replen += decode_delegreturn_maxsz;
}
#if defined(CONFIG_NFS_V4_1)
/* NFSv4.1 operations */
static void encode_exchange_id(struct xdr_stream *xdr,
struct nfs41_exchange_id_args *args,
struct compound_hdr *hdr)
{
__be32 *p;
RESERVE_SPACE(4 + sizeof(args->verifier->data));
WRITE32(OP_EXCHANGE_ID);
WRITEMEM(args->verifier->data, sizeof(args->verifier->data));
encode_string(xdr, args->id_len, args->id);
RESERVE_SPACE(12);
WRITE32(args->flags);
WRITE32(0); /* zero length state_protect4_a */
WRITE32(0); /* zero length implementation id array */
hdr->nops++;
hdr->replen += decode_exchange_id_maxsz;
}
#endif /* CONFIG_NFS_V4_1 */
static void encode_sequence(struct xdr_stream *xdr,
const struct nfs4_sequence_args *args,
struct compound_hdr *hdr)
@ -2162,6 +2213,26 @@ static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, __be32 *p, struct nfs
return 0;
}
#if defined(CONFIG_NFS_V4_1)
/*
* EXCHANGE_ID request
*/
static int nfs4_xdr_enc_exchange_id(struct rpc_rqst *req, uint32_t *p,
struct nfs41_exchange_id_args *args)
{
struct xdr_stream xdr;
struct compound_hdr hdr = {
.minorversion = args->client->cl_minorversion,
};
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_compound_hdr(&xdr, req, &hdr);
encode_exchange_id(&xdr, args, &hdr);
encode_nops(&hdr);
return 0;
}
#endif /* CONFIG_NFS_V4_1 */
/*
* START OF "GENERIC" DECODE ROUTINES.
* These may look a little ugly since they are imported from a "generic"
@ -3877,6 +3948,52 @@ static int decode_delegreturn(struct xdr_stream *xdr)
return decode_op_hdr(xdr, OP_DELEGRETURN);
}
#if defined(CONFIG_NFS_V4_1)
static int decode_exchange_id(struct xdr_stream *xdr,
struct nfs41_exchange_id_res *res)
{
__be32 *p;
uint32_t dummy;
int status;
struct nfs_client *clp = res->client;
status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
if (status)
return status;
READ_BUF(8);
READ64(clp->cl_ex_clid);
READ_BUF(12);
READ32(clp->cl_seqid);
READ32(clp->cl_exchange_flags);
/* We ask for SP4_NONE */
READ32(dummy);
if (dummy != SP4_NONE)
return -EIO;
/* Throw away minor_id */
READ_BUF(8);
/* Throw away Major id */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy);
/* Throw away server_scope */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy);
/* Throw away Implementation id array */
READ_BUF(4);
READ32(dummy);
READ_BUF(dummy);
return 0;
}
#endif /* CONFIG_NFS_V4_1 */
static int decode_sequence(struct xdr_stream *xdr,
struct nfs4_sequence_res *res,
struct rpc_rqst *rqstp)
@ -4774,6 +4891,25 @@ static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req, __be32 *p,
return status;
}
#if defined(CONFIG_NFS_V4_1)
/*
* EXCHANGE_ID request
*/
static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp, uint32_t *p,
void *res)
{
struct xdr_stream xdr;
struct compound_hdr hdr;
int status;
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
status = decode_compound_hdr(&xdr, &hdr);
if (!status)
status = decode_exchange_id(&xdr, res);
return status;
}
#endif /* CONFIG_NFS_V4_1 */
__be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus)
{
uint32_t bitmap[2] = {0};
@ -4943,6 +5079,9 @@ struct rpc_procinfo nfs4_procedures[] = {
PROC(GETACL, enc_getacl, dec_getacl),
PROC(SETACL, enc_setacl, dec_setacl),
PROC(FS_LOCATIONS, enc_fs_locations, dec_fs_locations),
#if defined(CONFIG_NFS_V4_1)
PROC(EXCHANGE_ID, enc_exchange_id, dec_exchange_id),
#endif /* CONFIG_NFS_V4_1 */
};
struct rpc_version nfs_version4 = {

1
include/linux/nfs4.h
View file

@ -21,6 +21,7 @@
#define NFS4_FHSIZE 128
#define NFS4_MAXPATHLEN PATH_MAX
#define NFS4_MAXNAMLEN NAME_MAX
#define NFS4_OPAQUE_LIMIT 1024
#define NFS4_MAX_SESSIONID_LEN 16
#define NFS4_ACCESS_READ 0x0001

6
include/linux/nfs_fs_sb.h
View file

@ -78,6 +78,12 @@ struct nfs_client {
#endif /* CONFIG_NFS_V4 */
#ifdef CONFIG_NFS_V4_1
/* clientid returned from EXCHANGE_ID, used by session operations */
u64 cl_ex_clid;
/* The sequence id to use for the next CREATE_SESSION */
u32 cl_seqid;
/* The flags used for obtaining the clientid during EXCHANGE_ID */
u32 cl_exchange_flags;
struct nfs4_session *cl_session; /* sharred session */
#endif /* CONFIG_NFS_V4_1 */

40
include/linux/nfs_xdr.h
View file

@ -879,6 +879,46 @@ struct nfs4_fs_locations_res {
#endif /* CONFIG_NFS_V4 */
struct nfstime4 {
u64 seconds;
u32 nseconds;
};
#ifdef CONFIG_NFS_V4_1
struct nfs_impl_id4 {
u32 domain_len;
char *domain;
u32 name_len;
char *name;
struct nfstime4 date;
};
#define NFS4_EXCHANGE_ID_LEN (48)
struct nfs41_exchange_id_args {
struct nfs_client *client;
nfs4_verifier *verifier;
unsigned int id_len;
char id[NFS4_EXCHANGE_ID_LEN];
u32 flags;
};
struct server_owner {
uint64_t minor_id;
uint32_t major_id_sz;
char major_id[NFS4_OPAQUE_LIMIT];
};
struct server_scope {
uint32_t server_scope_sz;
char server_scope[NFS4_OPAQUE_LIMIT];
};
struct nfs41_exchange_id_res {
struct nfs_client *client;
u32 flags;
};
#endif /* CONFIG_NFS_V4_1 */
struct nfs_page;
#define NFS_PAGEVEC_SIZE (8U)

1
include/linux/nfsd/state.h
View file

@ -41,7 +41,6 @@
#include <linux/kref.h>
#include <linux/sunrpc/clnt.h>
#define NFS4_OPAQUE_LIMIT 1024
typedef struct {
u32 cl_boot;
u32 cl_id;