dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

NFSv4.1: Don't clobber the seqid if exchange_id returns a confirmed clientid 

If the EXCHGID4_FLAG_CONFIRMED_R flag is set, the client is in theory
supposed to already know the correct value of the seqid, in which case
RFC5661 states that it should ignore the value returned.

Also ensure that if the sanity check in nfs4_check_cl_exchange_flags
fails, then we must not change the nfs_client fields.

Finally, clean up the code: we don't need to retest the value of
'status' unless it can change.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-05-26 13:41:04 -04:00
parent 6624553910
commit 32b0131069
3 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/nfs/nfs4proc.c
View File

@ -5171,7 +5171,7 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
};
struct nfs41_exchange_id_res res = {
.client = clp,
0
};
int status;
struct rpc_message msg = {
@ -5214,22 +5214,22 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (status == 0)
status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
status = nfs4_check_cl_exchange_flags(res.flags);
if (status == 0) {
clp->cl_clientid = res.clientid;
clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
clp->cl_seqid = res.seqid;
kfree(clp->cl_serverowner);
clp->cl_serverowner = res.server_owner;
res.server_owner = NULL;
}
if (status == 0) {
/* use the most recent implementation id */
kfree(clp->cl_implid);
clp->cl_implid = res.impl_id;
} else
kfree(res.impl_id);
if (status == 0) {
if (clp->cl_serverscope != NULL &&
!nfs41_same_server_scope(clp->cl_serverscope,
res.server_scope)) {
@ -5244,7 +5244,8 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
clp->cl_serverscope = res.server_scope;
goto out;
}
}
} else
kfree(res.impl_id);
out_server_owner:
kfree(res.server_owner);

7
fs/nfs/nfs4xdr.c
View File

@ -5319,7 +5319,6 @@ static int decode_exchange_id(struct xdr_stream *xdr,
uint32_t dummy;
char *dummy_str;
int status;
struct nfs_client *clp = res->client;
uint32_t impl_id_count;
status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
@ -5329,12 +5328,12 @@ static int decode_exchange_id(struct xdr_stream *xdr,
p = xdr_inline_decode(xdr, 8);
if (unlikely(!p))
goto out_overflow;
xdr_decode_hyper(p, &clp->cl_clientid);
xdr_decode_hyper(p, &res->clientid);
p = xdr_inline_decode(xdr, 12);
if (unlikely(!p))
goto out_overflow;
clp->cl_seqid = be32_to_cpup(p++);
clp->cl_exchange_flags = be32_to_cpup(p++);
res->seqid = be32_to_cpup(p++);
res->flags = be32_to_cpup(p++);
/* We ask for SP4_NONE */
dummy = be32_to_cpup(p);

3
include/linux/nfs_xdr.h
View File

@ -1132,7 +1132,8 @@ struct nfs41_bind_conn_to_session_res {
};
struct nfs41_exchange_id_res {
struct nfs_client *client;
u64 clientid;
u32 seqid;
u32 flags;
struct nfs41_server_owner *server_owner;
struct nfs41_server_scope *server_scope;