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SUNRPC: Provide a callback to allow free pages allocated during xdr encoding 

For privacy, we need to allocate pages to store the encrypted data (passed
 in pages can't be used without the risk of corrupting data in the page cache).
 So we need a way to free that memory after the request has been transmitted.

 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 2005-10-13 16:54:43 -04:00 committed by Trond Myklebust
parent 293f1eb551
commit ead5e1c26f
2 changed files with 7 additions and 1 deletions
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5
include/linux/sunrpc/xprt.h
View File

@ -73,7 +73,10 @@ struct rpc_rqst {
int rq_cong; /* has incremented xprt->cong */
int rq_received; /* receive completed */
u32 rq_seqno; /* gss seq no. used on req. */
int rq_enc_pages_num;
struct page **rq_enc_pages; /* scratch pages for use by
gss privacy code */
void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
struct list_head rq_list;
struct xdr_buf rq_private_buf; /* The receive buffer

3
net/sunrpc/xprt.c
View File

@ -839,6 +839,7 @@ static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt)
req->rq_task = task;
req->rq_xprt = xprt;
req->rq_xid = xprt_alloc_xid(xprt);
req->rq_release_snd_buf = NULL;
dprintk("RPC: %4d reserved req %p xid %08x\n", task->tk_pid,
req, ntohl(req->rq_xid));
}
@ -867,6 +868,8 @@ void xprt_release(struct rpc_task *task)
xprt->last_used + xprt->idle_timeout);
spin_unlock_bh(&xprt->transport_lock);
task->tk_rqstp = NULL;
if (req->rq_release_snd_buf)
req->rq_release_snd_buf(req);
memset(req, 0, sizeof(*req)); /* mark unused */
dprintk("RPC: %4d release request %p\n", task->tk_pid, req);