mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 14:11:52 +00:00
eb8ed7c6ab
Most of the existing APIs have remained the same, but subsystems that access file_lock fields directly need to reach into struct file_lock_core now. Signed-off-by: Jeff Layton <jlayton@kernel.org> Link: https://lore.kernel.org/r/20240131-flsplit-v3-40-c6129007ee8d@kernel.org Reviewed-by: NeilBrown <neilb@suse.de> Signed-off-by: Christian Brauner <brauner@kernel.org>
355 lines
7.6 KiB
C
355 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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>
|
|
|
|
#include <uapi/linux/nfs2.h>
|
|
|
|
#include "svcxdr.h"
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* NLM file handles are defined by specification to be a variable-length
|
|
* XDR opaque no longer than 1024 bytes. However, this implementation
|
|
* constrains their length to exactly the length of an NFSv2 file
|
|
* handle.
|
|
*/
|
|
static bool
|
|
svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
|
|
{
|
|
__be32 *p;
|
|
u32 len;
|
|
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0)
|
|
return false;
|
|
if (len != NFS2_FHSIZE)
|
|
return false;
|
|
|
|
p = xdr_inline_decode(xdr, len);
|
|
if (!p)
|
|
return false;
|
|
fh->size = NFS2_FHSIZE;
|
|
memcpy(fh->data, p, len);
|
|
memset(fh->data + NFS2_FHSIZE, 0, sizeof(fh->data) - NFS2_FHSIZE);
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
|
|
{
|
|
struct file_lock *fl = &lock->fl;
|
|
s32 start, len, end;
|
|
|
|
if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
|
|
return false;
|
|
if (!svcxdr_decode_fhandle(xdr, &lock->fh))
|
|
return false;
|
|
if (!svcxdr_decode_owner(xdr, &lock->oh))
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &start) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0)
|
|
return false;
|
|
|
|
locks_init_lock(fl);
|
|
fl->c.flc_flags = FL_POSIX;
|
|
fl->c.flc_type = F_RDLCK;
|
|
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 true;
|
|
}
|
|
|
|
static bool
|
|
svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
|
|
{
|
|
const struct file_lock *fl = &lock->fl;
|
|
s32 start, len;
|
|
|
|
/* exclusive */
|
|
if (xdr_stream_encode_bool(xdr, fl->c.flc_type != F_RDLCK) < 0)
|
|
return false;
|
|
if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
|
|
return false;
|
|
if (!svcxdr_encode_owner(xdr, &lock->oh))
|
|
return false;
|
|
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);
|
|
if (xdr_stream_encode_u32(xdr, start) < 0)
|
|
return false;
|
|
if (xdr_stream_encode_u32(xdr, len) < 0)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
|
|
{
|
|
if (!svcxdr_encode_stats(xdr, resp->status))
|
|
return false;
|
|
switch (resp->status) {
|
|
case nlm_lck_denied:
|
|
if (!svcxdr_encode_holder(xdr, &resp->lock))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/*
|
|
* Decode Call arguments
|
|
*/
|
|
|
|
bool
|
|
nlmsvc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_args *argp = rqstp->rq_argp;
|
|
u32 exclusive;
|
|
|
|
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
|
|
return false;
|
|
if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
|
|
return false;
|
|
if (!svcxdr_decode_lock(xdr, &argp->lock))
|
|
return false;
|
|
if (exclusive)
|
|
argp->lock.fl.c.flc_type = F_WRLCK;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_args *argp = rqstp->rq_argp;
|
|
u32 exclusive;
|
|
|
|
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
|
|
return false;
|
|
if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
|
|
return false;
|
|
if (!svcxdr_decode_lock(xdr, &argp->lock))
|
|
return false;
|
|
if (exclusive)
|
|
argp->lock.fl.c.flc_type = F_WRLCK;
|
|
if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
|
|
return false;
|
|
argp->monitor = 1; /* monitor client by default */
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_args *argp = rqstp->rq_argp;
|
|
u32 exclusive;
|
|
|
|
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
|
|
return false;
|
|
if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
|
|
return false;
|
|
if (!svcxdr_decode_lock(xdr, &argp->lock))
|
|
return false;
|
|
if (exclusive)
|
|
argp->lock.fl.c.flc_type = F_WRLCK;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_args *argp = rqstp->rq_argp;
|
|
|
|
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
|
|
return false;
|
|
if (!svcxdr_decode_lock(xdr, &argp->lock))
|
|
return false;
|
|
argp->lock.fl.c.flc_type = F_UNLCK;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_res *resp = rqstp->rq_argp;
|
|
|
|
if (!svcxdr_decode_cookie(xdr, &resp->cookie))
|
|
return false;
|
|
if (!svcxdr_decode_stats(xdr, &resp->status))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_reboot *argp = rqstp->rq_argp;
|
|
__be32 *p;
|
|
u32 len;
|
|
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0)
|
|
return false;
|
|
if (len > SM_MAXSTRLEN)
|
|
return false;
|
|
p = xdr_inline_decode(xdr, len);
|
|
if (!p)
|
|
return false;
|
|
argp->len = len;
|
|
argp->mon = (char *)p;
|
|
if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
|
|
return false;
|
|
p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
|
|
if (!p)
|
|
return false;
|
|
memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_args *argp = rqstp->rq_argp;
|
|
struct nlm_lock *lock = &argp->lock;
|
|
|
|
memset(lock, 0, sizeof(*lock));
|
|
locks_init_lock(&lock->fl);
|
|
lock->svid = ~(u32)0;
|
|
|
|
if (!svcxdr_decode_cookie(xdr, &argp->cookie))
|
|
return false;
|
|
if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
|
|
return false;
|
|
if (!svcxdr_decode_fhandle(xdr, &lock->fh))
|
|
return false;
|
|
if (!svcxdr_decode_owner(xdr, &lock->oh))
|
|
return false;
|
|
/* XXX: Range checks are missing in the original code */
|
|
if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_args *argp = rqstp->rq_argp;
|
|
struct nlm_lock *lock = &argp->lock;
|
|
|
|
if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/*
|
|
* Encode Reply results
|
|
*/
|
|
|
|
bool
|
|
nlmsvc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
nlmsvc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_res *resp = rqstp->rq_resp;
|
|
|
|
return svcxdr_encode_cookie(xdr, &resp->cookie) &&
|
|
svcxdr_encode_testrply(xdr, resp);
|
|
}
|
|
|
|
bool
|
|
nlmsvc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_res *resp = rqstp->rq_resp;
|
|
|
|
return svcxdr_encode_cookie(xdr, &resp->cookie) &&
|
|
svcxdr_encode_stats(xdr, resp->status);
|
|
}
|
|
|
|
bool
|
|
nlmsvc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
|
|
{
|
|
struct nlm_res *resp = rqstp->rq_resp;
|
|
|
|
if (!svcxdr_encode_cookie(xdr, &resp->cookie))
|
|
return false;
|
|
if (!svcxdr_encode_stats(xdr, resp->status))
|
|
return false;
|
|
/* sequence */
|
|
if (xdr_stream_encode_u32(xdr, 0) < 0)
|
|
return false;
|
|
|
|
return true;
|
|
}
|