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[PATCH] RPC: Lazy RPC receive buffer allocation

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Signed-off-by: Olaf Kirch <okir@suse.de>
 Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Olaf Kirch 2005-06-22 17:16:24 +00:00 committed by Trond Myklebust
parent 007e251f2b
commit e053d1ab62
3 changed files with 36 additions and 8 deletions
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2
include/linux/sunrpc/xdr.h
View file

@ -160,7 +160,7 @@ typedef struct {
typedef size_t (*skb_read_actor_t)(skb_reader_t *desc, void *to, size_t len);
extern void xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
extern int xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
skb_reader_t *, skb_read_actor_t);
struct socket;

16
net/sunrpc/xdr.c
View file

@ -176,7 +176,7 @@ xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
xdr->buflen += len;
}
void
int
xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base,
skb_reader_t *desc,
skb_read_actor_t copy_actor)
@ -190,7 +190,7 @@ xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base,
len -= base;
ret = copy_actor(desc, (char *)xdr->head[0].iov_base + base, len);
if (ret != len || !desc->count)
return;
return 0;
base = 0;
} else
base -= len;
@ -210,6 +210,14 @@ xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base,
do {
char *kaddr;
/* ACL likes to be lazy in allocating pages - ACLs
* are small by default but can get huge. */
if (unlikely(*ppage == NULL)) {
*ppage = alloc_page(GFP_ATOMIC);
if (unlikely(*ppage == NULL))
return -ENOMEM;
}
len = PAGE_CACHE_SIZE;
kaddr = kmap_atomic(*ppage, KM_SKB_SUNRPC_DATA);
if (base) {
@ -226,13 +234,15 @@ xdr_partial_copy_from_skb(struct xdr_buf *xdr, unsigned int base,
flush_dcache_page(*ppage);
kunmap_atomic(kaddr, KM_SKB_SUNRPC_DATA);
if (ret != len || !desc->count)
return;
return 0;
ppage++;
} while ((pglen -= len) != 0);
copy_tail:
len = xdr->tail[0].iov_len;
if (base < len)
copy_actor(desc, (char *)xdr->tail[0].iov_base + base, len - base);
return 0;
}

26
net/sunrpc/xprt.c
View file

@ -725,7 +725,8 @@ csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
goto no_checksum;
desc.csum = csum_partial(skb->data, desc.offset, skb->csum);
xdr_partial_copy_from_skb(xdr, 0, &desc, skb_read_and_csum_bits);
if (xdr_partial_copy_from_skb(xdr, 0, &desc, skb_read_and_csum_bits) < 0)
return -1;
if (desc.offset != skb->len) {
unsigned int csum2;
csum2 = skb_checksum(skb, desc.offset, skb->len - desc.offset, 0);
@ -737,7 +738,8 @@ csum_partial_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
return -1;
return 0;
no_checksum:
xdr_partial_copy_from_skb(xdr, 0, &desc, skb_read_bits);
if (xdr_partial_copy_from_skb(xdr, 0, &desc, skb_read_bits) < 0)
return -1;
if (desc.count)
return -1;
return 0;
@ -907,6 +909,7 @@ tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
struct rpc_rqst *req;
struct xdr_buf *rcvbuf;
size_t len;
int r;
/* Find and lock the request corresponding to this xid */
spin_lock(&xprt->sock_lock);
@ -927,16 +930,30 @@ tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
len = xprt->tcp_reclen - xprt->tcp_offset;
memcpy(&my_desc, desc, sizeof(my_desc));
my_desc.count = len;
xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
&my_desc, tcp_copy_data);
desc->count -= len;
desc->offset += len;
} else
xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
desc, tcp_copy_data);
xprt->tcp_copied += len;
xprt->tcp_offset += len;
if (r < 0) {
/* Error when copying to the receive buffer,
* usually because we weren't able to allocate
* additional buffer pages. All we can do now
* is turn off XPRT_COPY_DATA, so the request
* will not receive any additional updates,
* and time out.
* Any remaining data from this record will
* be discarded.
*/
xprt->tcp_flags &= ~XPRT_COPY_DATA;
goto out;
}
if (xprt->tcp_copied == req->rq_private_buf.buflen)
xprt->tcp_flags &= ~XPRT_COPY_DATA;
else if (xprt->tcp_offset == xprt->tcp_reclen) {
@ -949,6 +966,7 @@ tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
req->rq_task->tk_pid);
xprt_complete_rqst(xprt, req, xprt->tcp_copied);
}
out:
spin_unlock(&xprt->sock_lock);
tcp_check_recm(xprt);
}