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SUNRPC: move bkl locking and xdr proc invocation into a common helper

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Since every invocation of xdr encode or decode functions takes the BKL now,
there's a lot of redundant lock_kernel/unlock_kernel pairs that we can pull
out into a common function.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
J. Bruce Fields 2007-07-11 18:39:02 -04:00 committed by Trond Myklebust
parent e3a535e173
commit be879c4e24
3 changed files with 23 additions and 27 deletions
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16
include/linux/sunrpc/xdr.h
View file

@ -12,6 +12,7 @@
#include <linux/uio.h>
#include <asm/byteorder.h>
#include <linux/scatterlist.h>
#include <linux/smp_lock.h>
/*
* Buffer adjustment
@ -35,6 +36,21 @@ struct xdr_netobj {
*/
typedef int (*kxdrproc_t)(void *rqstp, __be32 *data, void *obj);
/*
* We're still requiring the BKL in the xdr code until it's been
* more carefully audited, at which point this wrapper will become
* unnecessary.
*/
static inline int rpc_call_xdrproc(kxdrproc_t xdrproc, void *rqstp, __be32 *data, void *obj)
{
int ret;
lock_kernel();
ret = xdrproc(rqstp, data, obj);
unlock_kernel();
return ret;
}
/*
* Basic structure for transmission/reception of a client XDR message.
* Features a header (for a linear buffer containing RPC headers

13
net/sunrpc/auth.c
View file

@ -13,7 +13,6 @@
#include <linux/errno.h>
#include <linux/sunrpc/clnt.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
@ -476,17 +475,13 @@ rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp,
__be32 *data, void *obj)
{
struct rpc_cred *cred = task->tk_msg.rpc_cred;
int ret;
dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
task->tk_pid, cred->cr_ops->cr_name, cred);
if (cred->cr_ops->crwrap_req)
return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
/* By default, we encode the arguments normally. */
lock_kernel();
ret = encode(rqstp, data, obj);
unlock_kernel();
return ret;
return rpc_call_xdrproc(encode, rqstp, data, obj);
}
int
@ -494,7 +489,6 @@ rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
__be32 *data, void *obj)
{
struct rpc_cred *cred = task->tk_msg.rpc_cred;
int ret;
dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
task->tk_pid, cred->cr_ops->cr_name, cred);
@ -502,10 +496,7 @@ rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
data, obj);
/* By default, we decode the arguments normally. */
lock_kernel();
ret = decode(rqstp, data, obj);
unlock_kernel();
return ret;
return rpc_call_xdrproc(decode, rqstp, data, obj);
}
int

21
net/sunrpc/auth_gss/auth_gss.c
View file

@ -43,7 +43,6 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/auth.h>
@ -1000,9 +999,7 @@ gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
*p++ = htonl(rqstp->rq_seqno);
lock_kernel();
status = encode(rqstp, p, obj);
unlock_kernel();
status = rpc_call_xdrproc(encode, rqstp, p, obj);
if (status)
return status;
@ -1096,9 +1093,7 @@ gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
*p++ = htonl(rqstp->rq_seqno);
lock_kernel();
status = encode(rqstp, p, obj);
unlock_kernel();
status = rpc_call_xdrproc(encode, rqstp, p, obj);
if (status)
return status;
@ -1157,16 +1152,12 @@ gss_wrap_req(struct rpc_task *task,
/* The spec seems a little ambiguous here, but I think that not
* wrapping context destruction requests makes the most sense.
*/
lock_kernel();
status = encode(rqstp, p, obj);
unlock_kernel();
status = rpc_call_xdrproc(encode, rqstp, p, obj);
goto out;
}
switch (gss_cred->gc_service) {
case RPC_GSS_SVC_NONE:
lock_kernel();
status = encode(rqstp, p, obj);
unlock_kernel();
status = rpc_call_xdrproc(encode, rqstp, p, obj);
break;
case RPC_GSS_SVC_INTEGRITY:
status = gss_wrap_req_integ(cred, ctx, encode,
@ -1282,9 +1273,7 @@ gss_unwrap_resp(struct rpc_task *task,
cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
+ (savedlen - head->iov_len);
out_decode:
lock_kernel();
status = decode(rqstp, p, obj);
unlock_kernel();
status = rpc_call_xdrproc(decode, rqstp, p, obj);
out:
gss_put_ctx(ctx);
dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid,