344 lines
7.2 KiB
C
344 lines
7.2 KiB
C
/*
|
|
* linux/fs/lockd/xdr.c
|
|
*
|
|
* XDR support for lockd and the lock client.
|
|
*
|
|
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/nfs.h>
|
|
|
|
#include <linux/sunrpc/xdr.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
#include <linux/sunrpc/svc.h>
|
|
#include <linux/sunrpc/stats.h>
|
|
#include <linux/lockd/lockd.h>
|
|
|
|
#define NLMDBG_FACILITY NLMDBG_XDR
|
|
|
|
|
|
static inline loff_t
|
|
s32_to_loff_t(__s32 offset)
|
|
{
|
|
return (loff_t)offset;
|
|
}
|
|
|
|
static inline __s32
|
|
loff_t_to_s32(loff_t offset)
|
|
{
|
|
__s32 res;
|
|
if (offset >= NLM_OFFSET_MAX)
|
|
res = NLM_OFFSET_MAX;
|
|
else if (offset <= -NLM_OFFSET_MAX)
|
|
res = -NLM_OFFSET_MAX;
|
|
else
|
|
res = offset;
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* XDR functions for basic NLM types
|
|
*/
|
|
static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
|
|
{
|
|
unsigned int len;
|
|
|
|
len = ntohl(*p++);
|
|
|
|
if(len==0)
|
|
{
|
|
c->len=4;
|
|
memset(c->data, 0, 4); /* hockeypux brain damage */
|
|
}
|
|
else if(len<=NLM_MAXCOOKIELEN)
|
|
{
|
|
c->len=len;
|
|
memcpy(c->data, p, len);
|
|
p+=XDR_QUADLEN(len);
|
|
}
|
|
else
|
|
{
|
|
dprintk("lockd: bad cookie size %d (only cookies under "
|
|
"%d bytes are supported.)\n",
|
|
len, NLM_MAXCOOKIELEN);
|
|
return NULL;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static inline __be32 *
|
|
nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
|
|
{
|
|
*p++ = htonl(c->len);
|
|
memcpy(p, c->data, c->len);
|
|
p+=XDR_QUADLEN(c->len);
|
|
return p;
|
|
}
|
|
|
|
static __be32 *
|
|
nlm_decode_fh(__be32 *p, struct nfs_fh *f)
|
|
{
|
|
unsigned int len;
|
|
|
|
if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
|
|
dprintk("lockd: bad fhandle size %d (should be %d)\n",
|
|
len, NFS2_FHSIZE);
|
|
return NULL;
|
|
}
|
|
f->size = NFS2_FHSIZE;
|
|
memset(f->data, 0, sizeof(f->data));
|
|
memcpy(f->data, p, NFS2_FHSIZE);
|
|
return p + XDR_QUADLEN(NFS2_FHSIZE);
|
|
}
|
|
|
|
static inline __be32 *
|
|
nlm_encode_fh(__be32 *p, struct nfs_fh *f)
|
|
{
|
|
*p++ = htonl(NFS2_FHSIZE);
|
|
memcpy(p, f->data, NFS2_FHSIZE);
|
|
return p + XDR_QUADLEN(NFS2_FHSIZE);
|
|
}
|
|
|
|
/*
|
|
* Encode and decode owner handle
|
|
*/
|
|
static inline __be32 *
|
|
nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
|
|
{
|
|
return xdr_decode_netobj(p, oh);
|
|
}
|
|
|
|
static inline __be32 *
|
|
nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
|
|
{
|
|
return xdr_encode_netobj(p, oh);
|
|
}
|
|
|
|
static __be32 *
|
|
nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
|
|
{
|
|
struct file_lock *fl = &lock->fl;
|
|
s32 start, len, end;
|
|
|
|
if (!(p = xdr_decode_string_inplace(p, &lock->caller,
|
|
&lock->len,
|
|
NLM_MAXSTRLEN))
|
|
|| !(p = nlm_decode_fh(p, &lock->fh))
|
|
|| !(p = nlm_decode_oh(p, &lock->oh)))
|
|
return NULL;
|
|
lock->svid = ntohl(*p++);
|
|
|
|
locks_init_lock(fl);
|
|
fl->fl_owner = current->files;
|
|
fl->fl_pid = (pid_t)lock->svid;
|
|
fl->fl_flags = FL_POSIX;
|
|
fl->fl_type = F_RDLCK; /* as good as anything else */
|
|
start = ntohl(*p++);
|
|
len = ntohl(*p++);
|
|
end = start + len - 1;
|
|
|
|
fl->fl_start = s32_to_loff_t(start);
|
|
|
|
if (len == 0 || end < 0)
|
|
fl->fl_end = OFFSET_MAX;
|
|
else
|
|
fl->fl_end = s32_to_loff_t(end);
|
|
return p;
|
|
}
|
|
|
|
/*
|
|
* Encode result of a TEST/TEST_MSG call
|
|
*/
|
|
static __be32 *
|
|
nlm_encode_testres(__be32 *p, struct nlm_res *resp)
|
|
{
|
|
s32 start, len;
|
|
|
|
if (!(p = nlm_encode_cookie(p, &resp->cookie)))
|
|
return NULL;
|
|
*p++ = resp->status;
|
|
|
|
if (resp->status == nlm_lck_denied) {
|
|
struct file_lock *fl = &resp->lock.fl;
|
|
|
|
*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
|
|
*p++ = htonl(resp->lock.svid);
|
|
|
|
/* Encode owner handle. */
|
|
if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
|
|
return NULL;
|
|
|
|
start = loff_t_to_s32(fl->fl_start);
|
|
if (fl->fl_end == OFFSET_MAX)
|
|
len = 0;
|
|
else
|
|
len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
|
|
|
|
*p++ = htonl(start);
|
|
*p++ = htonl(len);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
|
|
/*
|
|
* First, the server side XDR functions
|
|
*/
|
|
int
|
|
nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
|
|
{
|
|
u32 exclusive;
|
|
|
|
if (!(p = nlm_decode_cookie(p, &argp->cookie)))
|
|
return 0;
|
|
|
|
exclusive = ntohl(*p++);
|
|
if (!(p = nlm_decode_lock(p, &argp->lock)))
|
|
return 0;
|
|
if (exclusive)
|
|
argp->lock.fl.fl_type = F_WRLCK;
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
|
|
{
|
|
if (!(p = nlm_encode_testres(p, resp)))
|
|
return 0;
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
|
|
{
|
|
u32 exclusive;
|
|
|
|
if (!(p = nlm_decode_cookie(p, &argp->cookie)))
|
|
return 0;
|
|
argp->block = ntohl(*p++);
|
|
exclusive = ntohl(*p++);
|
|
if (!(p = nlm_decode_lock(p, &argp->lock)))
|
|
return 0;
|
|
if (exclusive)
|
|
argp->lock.fl.fl_type = F_WRLCK;
|
|
argp->reclaim = ntohl(*p++);
|
|
argp->state = ntohl(*p++);
|
|
argp->monitor = 1; /* monitor client by default */
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
|
|
{
|
|
u32 exclusive;
|
|
|
|
if (!(p = nlm_decode_cookie(p, &argp->cookie)))
|
|
return 0;
|
|
argp->block = ntohl(*p++);
|
|
exclusive = ntohl(*p++);
|
|
if (!(p = nlm_decode_lock(p, &argp->lock)))
|
|
return 0;
|
|
if (exclusive)
|
|
argp->lock.fl.fl_type = F_WRLCK;
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
|
|
{
|
|
if (!(p = nlm_decode_cookie(p, &argp->cookie))
|
|
|| !(p = nlm_decode_lock(p, &argp->lock)))
|
|
return 0;
|
|
argp->lock.fl.fl_type = F_UNLCK;
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
|
|
{
|
|
struct nlm_lock *lock = &argp->lock;
|
|
|
|
memset(lock, 0, sizeof(*lock));
|
|
locks_init_lock(&lock->fl);
|
|
lock->svid = ~(u32) 0;
|
|
lock->fl.fl_pid = (pid_t)lock->svid;
|
|
|
|
if (!(p = nlm_decode_cookie(p, &argp->cookie))
|
|
|| !(p = xdr_decode_string_inplace(p, &lock->caller,
|
|
&lock->len, NLM_MAXSTRLEN))
|
|
|| !(p = nlm_decode_fh(p, &lock->fh))
|
|
|| !(p = nlm_decode_oh(p, &lock->oh)))
|
|
return 0;
|
|
argp->fsm_mode = ntohl(*p++);
|
|
argp->fsm_access = ntohl(*p++);
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
|
|
{
|
|
if (!(p = nlm_encode_cookie(p, &resp->cookie)))
|
|
return 0;
|
|
*p++ = resp->status;
|
|
*p++ = xdr_zero; /* sequence argument */
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
|
|
{
|
|
if (!(p = nlm_encode_cookie(p, &resp->cookie)))
|
|
return 0;
|
|
*p++ = resp->status;
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
|
|
{
|
|
struct nlm_lock *lock = &argp->lock;
|
|
|
|
if (!(p = xdr_decode_string_inplace(p, &lock->caller,
|
|
&lock->len, NLM_MAXSTRLEN)))
|
|
return 0;
|
|
argp->state = ntohl(*p++);
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
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++);
|
|
memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
|
|
p += XDR_QUADLEN(SM_PRIV_SIZE);
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
|
|
{
|
|
if (!(p = nlm_decode_cookie(p, &resp->cookie)))
|
|
return 0;
|
|
resp->status = *p++;
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
|
|
{
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
|
|
{
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|