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NLM: Decode "priv" argument of NLMPROC_SM_NOTIFY as an opaque

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The NLM XDR decoders for the NLMPROC_SM_NOTIFY procedure should treat
their "priv" argument truly as an opaque, as defined by the protocol,
and let the upper layers figure out what is in it.

This will make it easier to modify the contents and interpretation of
the "priv" argument, and keep knowledge about what's in "priv" local
to fs/lockd/mon.c.

For now, the NLM and NSM implementations should behave exactly as they
did before.

The formation of the address of the rebooted host in
nlm_host_rebooted() may look a little strange, but it is the inverse
of how nsm_init_private() forms the private cookie.  Plus, it's
going away soon anyway.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Chuck Lever 2008-12-05 19:03:39 -05:00 committed by J. Bruce Fields
parent 7fefc9cb9d
commit 576df4634e
4 changed files with 10 additions and 9 deletions
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3
fs/lockd/host.c
View file

@ -453,9 +453,10 @@ void nlm_release_host(struct nlm_host *host)
*/
void nlm_host_rebooted(const struct nlm_reboot *info)
{
__be32 *p = (__be32 *)&info->priv.data;
const struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_addr.s_addr = info->addr,
.sin_addr.s_addr = *p,
};
struct hlist_head *chain;
struct hlist_node *pos;

4
fs/lockd/xdr.c
View file

@ -349,8 +349,8 @@ nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
return 0;
argp->state = ntohl(*p++);
/* Preserve the address in network byte order */
argp->addr = *p++;
memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
p += XDR_QUADLEN(SM_PRIV_SIZE);
return xdr_argsize_check(rqstp, p);
}

4
fs/lockd/xdr4.c
View file

@ -356,8 +356,8 @@ nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp
if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
return 0;
argp->state = ntohl(*p++);
/* Preserve the address in network byte order */
argp->addr = *p++;
memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
p += XDR_QUADLEN(SM_PRIV_SIZE);
return xdr_argsize_check(rqstp, p);
}

8
include/linux/lockd/xdr.h
View file

@ -83,10 +83,10 @@ struct nlm_res {
* statd callback when client has rebooted
*/
struct nlm_reboot {
char * mon;
unsigned int len;
u32 state;
__be32 addr;
char *mon;
unsigned int len;
u32 state;
struct nsm_private priv;
};
/*