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nfs41 do not allocate unused back channel pages 

Signed-off-by: Andy Adamson <andros@netapp.com>
[Trond.Myklebust@netapp.com: moved definition of svc_is_backchannel()
 into include/linux/sunrpc/bc_xprt.h.]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2010-01-26 21:24:04 -05:00 committed by Trond Myklebust
parent 9733f0d928
commit ba17686f62
2 changed files with 19 additions and 0 deletions
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15
include/linux/sunrpc/bc_xprt.h
View File

@ -38,12 +38,27 @@ int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
void xprt_destroy_backchannel(struct rpc_xprt *, int max_reqs); void xprt_destroy_backchannel(struct rpc_xprt *, int max_reqs);
void bc_release_request(struct rpc_task *); void bc_release_request(struct rpc_task *);
int bc_send(struct rpc_rqst *req); int bc_send(struct rpc_rqst *req);
/*
* Determine if a shared backchannel is in use
*/
static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
{
if (rqstp->rq_server->bc_xprt)
return 1;
return 0;
}
#else /* CONFIG_NFS_V4_1 */ #else /* CONFIG_NFS_V4_1 */
static inline int xprt_setup_backchannel(struct rpc_xprt *xprt, static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
unsigned int min_reqs) unsigned int min_reqs)
{ {
return 0; return 0;
} }
static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
{
return 0;
}
#endif /* CONFIG_NFS_V4_1 */ #endif /* CONFIG_NFS_V4_1 */
#endif /* _LINUX_SUNRPC_BC_XPRT_H */ #endif /* _LINUX_SUNRPC_BC_XPRT_H */

4
net/sunrpc/svc.c
View File

@ -506,6 +506,10 @@ svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
{ {
unsigned int pages, arghi; unsigned int pages, arghi;
/* bc_xprt uses fore channel allocated buffers */
if (svc_is_backchannel(rqstp))
return 1;
pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply. pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
* We assume one is at most one page * We assume one is at most one page
*/ */