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Commit c6b0a9f8 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
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[PATCH] knfsd: tidy up up meaning of 'buffer size' in nfsd/sunrpc 

There is some confusion about the meaning of 'bufsz' for a sunrpc server.
In some cases it is the largest message that can be sent or received.  In
other cases it is the largest 'payload' that can be included in a NFS
message.

In either case, it is not possible for both the request and the reply to be
this large.  One of the request or reply may only be one page long, which
fits nicely with NFS.

So we remove 'bufsz' and replace it with two numbers: 'max_payload' and
'max_mesg'.  Max_payload is the size that the server requests.  It is used
by the server to check the max size allowed on a particular connection:
depending on the protocol a lower limit might be used.

max_mesg is the largest single message that can be sent or received.  It is
calculated as the max_payload, rounded up to a multiple of PAGE_SIZE, and
with PAGE_SIZE added to overhead.  Only one of the request and reply may be
this size.  The other must be at most one page.

Cc: Greg Banks <gnb@sgi.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 5842730d
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Showing with 27 additions and 23 deletions
fs/nfsd/nfssvc.c
View file @ c6b0a9f8
......@@ -217,7 +217,7 @@ int nfsd_create_serv(void)
atomic_set(&nfsd_busy, 0);
nfsd_serv = svc_create_pooled(&nfsd_program,
NFSD_BUFSIZE - NFSSVC_MAXBLKSIZE + nfsd_max_blksize,
nfsd_max_blksize,
nfsd_last_thread,
nfsd, SIG_NOCLEAN, THIS_MODULE);
if (nfsd_serv == NULL)
......
include/linux/sunrpc/svc.h
View file @ c6b0a9f8
......@@ -57,7 +57,8 @@ struct svc_serv {
struct svc_stat * sv_stats; /* RPC statistics */
spinlock_t sv_lock;
unsigned int sv_nrthreads; /* # of server threads */
unsigned int sv_bufsz; /* datagram buffer size */
unsigned int sv_max_payload; /* datagram payload size */
unsigned int sv_max_mesg; /* max_payload + 1 page for overheads */
unsigned int sv_xdrsize; /* XDR buffer size */
struct list_head sv_permsocks; /* all permanent sockets */
......
net/sunrpc/svc.c
View file @ c6b0a9f8
......@@ -282,7 +282,10 @@ __svc_create(struct svc_program *prog, unsigned int bufsize, int npools,
serv->sv_program = prog;
serv->sv_nrthreads = 1;
serv->sv_stats = prog->pg_stats;
serv->sv_bufsz = bufsize? bufsize : 4096;
if (bufsize > RPCSVC_MAXPAYLOAD)
bufsize = RPCSVC_MAXPAYLOAD;
serv->sv_max_payload = bufsize? bufsize : 4096;
serv->sv_max_mesg = roundup(serv->sv_max_payload + PAGE_SIZE, PAGE_SIZE);
serv->sv_shutdown = shutdown;
xdrsize = 0;
while (prog) {
......@@ -414,9 +417,9 @@ svc_init_buffer(struct svc_rqst *rqstp, unsigned int size)
int pages;
int arghi;
if (size > RPCSVC_MAXPAYLOAD)
size = RPCSVC_MAXPAYLOAD;
pages = 2 + (size+ PAGE_SIZE -1) / PAGE_SIZE;
pages = size / PAGE_SIZE + 1; /* extra page as we hold both request and reply.
* We assume one is at most one page
*/
arghi = 0;
BUG_ON(pages > RPCSVC_MAXPAGES);
while (pages) {
......@@ -463,7 +466,7 @@ __svc_create_thread(svc_thread_fn func, struct svc_serv *serv,
if (!(rqstp->rq_argp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
|| !(rqstp->rq_resp = kmalloc(serv->sv_xdrsize, GFP_KERNEL))
|| !svc_init_buffer(rqstp, serv->sv_bufsz))
|| !svc_init_buffer(rqstp, serv->sv_max_mesg))
goto out_thread;
serv->sv_nrthreads++;
......@@ -938,8 +941,8 @@ u32 svc_max_payload(const struct svc_rqst *rqstp)
if (rqstp->rq_sock->sk_sock->type == SOCK_DGRAM)
max = RPCSVC_MAXPAYLOAD_UDP;
if (rqstp->rq_server->sv_bufsz < max)
max = rqstp->rq_server->sv_bufsz;
if (rqstp->rq_server->sv_max_payload < max)
max = rqstp->rq_server->sv_max_payload;
return max;
}
EXPORT_SYMBOL_GPL(svc_max_payload);
net/sunrpc/svcsock.c
View file @ c6b0a9f8
......@@ -192,13 +192,13 @@ svc_sock_enqueue(struct svc_sock *svsk)
svsk->sk_pool = pool;
set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
if (((atomic_read(&svsk->sk_reserved) + serv->sv_bufsz)*2
if (((atomic_read(&svsk->sk_reserved) + serv->sv_max_mesg)*2
> svc_sock_wspace(svsk))
&& !test_bit(SK_CLOSE, &svsk->sk_flags)
&& !test_bit(SK_CONN, &svsk->sk_flags)) {
/* Don't enqueue while not enough space for reply */
dprintk("svc: socket %p no space, %d*2 > %ld, not enqueued\n",
svsk->sk_sk, atomic_read(&svsk->sk_reserved)+serv->sv_bufsz,
svsk->sk_sk, atomic_read(&svsk->sk_reserved)+serv->sv_max_mesg,
svc_sock_wspace(svsk));
svsk->sk_pool = NULL;
clear_bit(SK_BUSY, &svsk->sk_flags);
......@@ -220,7 +220,7 @@ svc_sock_enqueue(struct svc_sock *svsk)
rqstp, rqstp->rq_sock);
rqstp->rq_sock = svsk;
atomic_inc(&svsk->sk_inuse);
rqstp->rq_reserved = serv->sv_bufsz;
rqstp->rq_reserved = serv->sv_max_mesg;
atomic_add(rqstp->rq_reserved, &svsk->sk_reserved);
BUG_ON(svsk->sk_pool != pool);
wake_up(&rqstp->rq_wait);
......@@ -639,8 +639,8 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)
* which will access the socket.
*/
svc_sock_setbufsize(svsk->sk_sock,
(serv->sv_nrthreads+3) * serv->sv_bufsz,
(serv->sv_nrthreads+3) * serv->sv_bufsz);
(serv->sv_nrthreads+3) * serv->sv_max_mesg,
(serv->sv_nrthreads+3) * serv->sv_max_mesg);
if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) {
svc_sock_received(svsk);
......@@ -749,8 +749,8 @@ svc_udp_init(struct svc_sock *svsk)
* svc_udp_recvfrom will re-adjust if necessary
*/
svc_sock_setbufsize(svsk->sk_sock,
3 * svsk->sk_server->sv_bufsz,
3 * svsk->sk_server->sv_bufsz);
3 * svsk->sk_server->sv_max_mesg,
3 * svsk->sk_server->sv_max_mesg);
set_bit(SK_DATA, &svsk->sk_flags); /* might have come in before data_ready set up */
set_bit(SK_CHNGBUF, &svsk->sk_flags);
......@@ -993,8 +993,8 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp)
* as soon a a complete request arrives.
*/
svc_sock_setbufsize(svsk->sk_sock,
(serv->sv_nrthreads+3) * serv->sv_bufsz,
3 * serv->sv_bufsz);
(serv->sv_nrthreads+3) * serv->sv_max_mesg,
3 * serv->sv_max_mesg);
clear_bit(SK_DATA, &svsk->sk_flags);
......@@ -1032,7 +1032,7 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp)
}
svsk->sk_reclen &= 0x7fffffff;
dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
if (svsk->sk_reclen > serv->sv_bufsz) {
if (svsk->sk_reclen > serv->sv_max_mesg) {
printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx (large)\n",
(unsigned long) svsk->sk_reclen);
goto err_delete;
......@@ -1171,8 +1171,8 @@ svc_tcp_init(struct svc_sock *svsk)
* svc_tcp_recvfrom will re-adjust if necessary
*/
svc_sock_setbufsize(svsk->sk_sock,
3 * svsk->sk_server->sv_bufsz,
3 * svsk->sk_server->sv_bufsz);
3 * svsk->sk_server->sv_max_mesg,
3 * svsk->sk_server->sv_max_mesg);
set_bit(SK_CHNGBUF, &svsk->sk_flags);
set_bit(SK_DATA, &svsk->sk_flags);
......@@ -1234,7 +1234,7 @@ svc_recv(struct svc_rqst *rqstp, long timeout)
/* now allocate needed pages. If we get a failure, sleep briefly */
pages = 2 + (serv->sv_bufsz + PAGE_SIZE -1) / PAGE_SIZE;
pages = (serv->sv_max_mesg + PAGE_SIZE) / PAGE_SIZE;
for (i=0; i < pages ; i++)
while (rqstp->rq_pages[i] == NULL) {
struct page *p = alloc_page(GFP_KERNEL);
......@@ -1263,7 +1263,7 @@ svc_recv(struct svc_rqst *rqstp, long timeout)
if ((svsk = svc_sock_dequeue(pool)) != NULL) {
rqstp->rq_sock = svsk;
atomic_inc(&svsk->sk_inuse);
rqstp->rq_reserved = serv->sv_bufsz;
rqstp->rq_reserved = serv->sv_max_mesg;
atomic_add(rqstp->rq_reserved, &svsk->sk_reserved);
} else {
/* No data pending. Go to sleep */
......
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