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NFS: added FREE_STATEID call

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FREE_STATEID is used to tell the server that we want to free a stateid
that no longer has any locks associated with it.  This allows the client
to reclaim locks without encountering edge conditions documented in
section 8.4.3 of RFC 5661.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker 2011-06-02 14:59:09 -04:00 committed by Trond Myklebust
parent 7d9747947a
commit 9aeda35fd6
4 changed files with 121 additions and 0 deletions
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30
fs/nfs/nfs4proc.c
View file

@ -6043,6 +6043,36 @@ static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *stat
} while (exception.retry);
return err;
}
static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
{
int status;
struct nfs41_free_stateid_args args = {
.stateid = &state->stateid,
};
struct nfs41_free_stateid_res res;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
.rpc_argp = &args,
.rpc_resp = &res,
};
args.seq_args.sa_session = res.seq_res.sr_session = NULL;
status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
return status;
}
static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
{
struct nfs4_exception exception = { };
int err;
do {
err = nfs4_handle_exception(server,
_nfs4_free_stateid(server, state),
&exception);
} while (exception.retry);
return err;
}
#endif /* CONFIG_NFS_V4_1 */
struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {

80
fs/nfs/nfs4xdr.c
View file

@ -348,6 +348,9 @@ static int nfs4_stat_to_errno(int);
#define encode_test_stateid_maxsz (op_encode_hdr_maxsz + 2 + \
XDR_QUADLEN(NFS4_STATEID_SIZE))
#define decode_test_stateid_maxsz (op_decode_hdr_maxsz + 2 + 1)
#define encode_free_stateid_maxsz (op_encode_hdr_maxsz + 1 + \
XDR_QUADLEN(NFS4_STATEID_SIZE))
#define decode_free_stateid_maxsz (op_decode_hdr_maxsz + 1)
#else /* CONFIG_NFS_V4_1 */
#define encode_sequence_maxsz 0
#define decode_sequence_maxsz 0
@ -791,6 +794,12 @@ static int nfs4_stat_to_errno(int);
#define NFS4_dec_test_stateid_sz (compound_decode_hdr_maxsz + \
decode_sequence_maxsz + \
decode_test_stateid_maxsz)
#define NFS4_enc_free_stateid_sz (compound_encode_hdr_maxsz + \
encode_sequence_maxsz + \
encode_free_stateid_maxsz)
#define NFS4_dec_free_stateid_sz (compound_decode_hdr_maxsz + \
decode_sequence_maxsz + \
decode_free_stateid_maxsz)
const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
compound_encode_hdr_maxsz +
@ -1985,6 +1994,18 @@ static void encode_test_stateid(struct xdr_stream *xdr,
hdr->nops++;
hdr->replen += decode_test_stateid_maxsz;
}
static void encode_free_stateid(struct xdr_stream *xdr,
struct nfs41_free_stateid_args *args,
struct compound_hdr *hdr)
{
__be32 *p;
p = reserve_space(xdr, 4 + NFS4_STATEID_SIZE);
*p++ = cpu_to_be32(OP_FREE_STATEID);
xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
hdr->nops++;
hdr->replen += decode_free_stateid_maxsz;
}
#endif /* CONFIG_NFS_V4_1 */
/*
@ -2873,6 +2894,23 @@ static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
encode_test_stateid(xdr, args, &hdr);
encode_nops(&hdr);
}
/*
* Encode FREE_STATEID request
*/
static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
struct xdr_stream *xdr,
struct nfs41_free_stateid_args *args)
{
struct compound_hdr hdr = {
.minorversion = nfs4_xdr_minorversion(&args->seq_args),
};
encode_compound_hdr(xdr, req, &hdr);
encode_sequence(xdr, &args->seq_args, &hdr);
encode_free_stateid(xdr, args, &hdr);
encode_nops(&hdr);
}
#endif /* CONFIG_NFS_V4_1 */
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
@ -5440,6 +5478,26 @@ out_overflow:
out:
return -EIO;
}
static int decode_free_stateid(struct xdr_stream *xdr,
struct nfs41_free_stateid_res *res)
{
__be32 *p;
int status;
status = decode_op_hdr(xdr, OP_FREE_STATEID);
if (status)
return status;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
res->status = be32_to_cpup(p++);
return res->status;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
}
#endif /* CONFIG_NFS_V4_1 */
/*
@ -6624,6 +6682,27 @@ static int nfs4_xdr_dec_test_stateid(struct rpc_rqst *rqstp,
out:
return status;
}
/*
* Decode FREE_STATEID response
*/
static int nfs4_xdr_dec_free_stateid(struct rpc_rqst *rqstp,
struct xdr_stream *xdr,
struct nfs41_free_stateid_res *res)
{
struct compound_hdr hdr;
int status;
status = decode_compound_hdr(xdr, &hdr);
if (status)
goto out;
status = decode_sequence(xdr, &res->seq_res, rqstp);
if (status)
goto out;
status = decode_free_stateid(xdr, res);
out:
return status;
}
#endif /* CONFIG_NFS_V4_1 */
/**
@ -6828,6 +6907,7 @@ struct rpc_procinfo nfs4_procedures[] = {
PROC(LAYOUTRETURN, enc_layoutreturn, dec_layoutreturn),
PROC(SECINFO_NO_NAME, enc_secinfo_no_name, dec_secinfo_no_name),
PROC(TEST_STATEID, enc_test_stateid, dec_test_stateid),
PROC(FREE_STATEID, enc_free_stateid, dec_free_stateid),
#endif /* CONFIG_NFS_V4_1 */
};

1
include/linux/nfs4.h
View file

@ -565,6 +565,7 @@ enum {
NFSPROC4_CLNT_LAYOUTRETURN,
NFSPROC4_CLNT_SECINFO_NO_NAME,
NFSPROC4_CLNT_TEST_STATEID,
NFSPROC4_CLNT_FREE_STATEID,
};
/* nfs41 types */

10
include/linux/nfs_xdr.h
View file

@ -1102,6 +1102,16 @@ struct nfs41_test_stateid_res {
struct nfs4_sequence_res seq_res;
};
struct nfs41_free_stateid_args {
nfs4_stateid *stateid;
struct nfs4_sequence_args seq_args;
};
struct nfs41_free_stateid_res {
unsigned int status;
struct nfs4_sequence_res seq_res;
};
#endif /* CONFIG_NFS_V4_1 */
struct nfs_page;