From c6b0a9f87b82f25fa35206ec04b5160372eabab4 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Fri, 6 Oct 2006 00:44:05 -0700 Subject: [PATCH] [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 Cc: "J. Bruce Fields" Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfsd/nfssvc.c | 2 +- include/linux/sunrpc/svc.h | 3 ++- net/sunrpc/svc.c | 17 ++++++++++------- net/sunrpc/svcsock.c | 28 ++++++++++++++-------------- 4 files changed, 27 insertions(+), 23 deletions(-) diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 6fa6340a5fb8..013b38996e64 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -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) diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index d6288e89fd9d..9c9a8ad92477 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -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 */ diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index c2c8bb20d07f..2807fa0eab40 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -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); diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index b39e7e2b648f..61e307cca13d 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -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 */ -- 2.20.1