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SubjectRe: 2.4.17:Increase number of anonymous filesystems beyond 256?
>[from linux-kernel]
> I have to increase the number of anonymous filesystems the kernel can handle
> and found the array unnamed_dev_in_use fs/super.c and changed the array size
> from the default of 256 to 1024. Testing this patch by mounting more and more
> NFS-filesystems I found that still no more than 800 NFS mounts are possible.
> One more mount results in the kernel saying:
>
> Jan 17 14:03:11 gl kernel: RPC: Can't bind to reserved port (98).
> Jan 17 14:03:11 gl kernel: NFS: cannot create RPC transport.
> Jan 17 14:03:11 gl kernel: nfs warning: mount version older than kernel

I did that. You also need a small fix to mount(8) that adds
a mount argument "-o nores". I've got an RPM at my website.

Initially I did a sysctl, but Trond M. asked for a mount
argument, in case you have to mount from several servers,
some of which require reserved ports, some do not.
Our NetApps work ok with non-reserved ports on clients.

I am surprised anyone is interested. If you need more than 800
mounts I think your system planning may be screwed.

Anyone cares to review? Trond? Viro?

-- Pete

--- linux-2.4.9-unmaj-6.diff ---
Copyright 2001 Red Hat, Inc.
GPL v2 - XXX fill in the legal blob.

diff -ur -X dontdiff linux-2.4.9-18.3/Documentation/Configure.help linux-2.4.9-18.3-p3/Documentation/Configure.help
--- linux-2.4.9-18.3/Documentation/Configure.help Tue Dec 18 13:01:06 2001
+++ linux-2.4.9-18.3-p3/Documentation/Configure.help Tue Dec 18 13:53:25 2001
@@ -23926,4 +23926,13 @@
in the lm_sensors package, which you can download at
http://www.lm-sensors.nu

+Additional unnamed block majors
+CONFIG_MORE_UNNAMED_MAJORS
+ This option allows to use majors 12, 14, 38, and 39 in addition to
+ major 0 for unnamed block devices, thus letting you to mount 1279
+ virtual filesystems.
+
+ If unsure, answer N. Thousands of mount points are unlikely to work
+ anyways.
+
# End:
diff -ur -X dontdiff linux-2.4.9-18.3/Makefile linux-2.4.9-18.3-p3/Makefile
--- linux-2.4.9-18.3/Makefile Tue Dec 18 13:10:50 2001
+++ linux-2.4.9-18.3-p3/Makefile Thu Jan 3 17:02:41 2002
@@ -1,7 +1,7 @@
VERSION = 2
PATCHLEVEL = 4
SUBLEVEL = 9
-EXTRAVERSION = -18.3
+EXTRAVERSION = -18.3-p3

KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)

@@ -339,7 +339,8 @@
$(TOPDIR)/include/linux/compile.h: include/linux/compile.h

newversion:
- . scripts/mkversion > .version
+ . scripts/mkversion > .tmpversion
+ @mv -f .tmpversion .version

include/linux/compile.h: $(CONFIGURATION) include/linux/version.h newversion
@echo -n \#define UTS_VERSION \"\#`cat .version` > .ver
diff -ur -X dontdiff linux-2.4.9-18.3/fs/Config.in linux-2.4.9-18.3-p3/fs/Config.in
--- linux-2.4.9-18.3/fs/Config.in Tue Dec 18 13:00:48 2001
+++ linux-2.4.9-18.3-p3/fs/Config.in Tue Dec 18 13:58:31 2001
@@ -137,6 +137,8 @@
define_bool CONFIG_SMB_FS n
fi

+bool 'More majors for unnamed block devices' CONFIG_MORE_UNNAMED_MAJORS
+
mainmenu_option next_comment
comment 'Partition Types'
source fs/partitions/Config.in
diff -ur -X dontdiff linux-2.4.9-18.3/fs/lockd/clntproc.c linux-2.4.9-18.3-p3/fs/lockd/clntproc.c
--- linux-2.4.9-18.3/fs/lockd/clntproc.c Tue Dec 18 13:01:03 2001
+++ linux-2.4.9-18.3-p3/fs/lockd/clntproc.c Mon Jan 7 13:28:29 2002
@@ -107,6 +107,7 @@
sigset_t oldset;
unsigned long flags;
int status, proto, vers;
+ int resport;

vers = (NFS_PROTO(inode)->version == 3) ? 4 : 1;
if (NFS_PROTO(inode)->version > 3) {
@@ -116,6 +117,7 @@

/* Retrieve transport protocol from NFS client */
proto = NFS_CLIENT(inode)->cl_xprt->prot;
+ resport = NFS_CLIENT(inode)->cl_xprt->resport;

if (!(host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers)))
return -ENOLCK;
@@ -127,7 +129,7 @@

/* Bind an rpc client to this host handle (does not
* perform a portmapper lookup) */
- if (!(clnt = nlm_bind_host(host))) {
+ if (!(clnt = nlm_bind_host(host, resport))) {
status = -ENOLCK;
goto done;
}
@@ -162,6 +164,7 @@
locks_init_lock(&call->a_res.lock.fl);
}
call->a_host = host;
+ call->a_resport = resport;

/* Set up the argument struct */
nlmclnt_setlockargs(call, fl);
@@ -260,7 +263,7 @@
}

/* If we have no RPC client yet, create one. */
- if ((clnt = nlm_bind_host(host)) == NULL)
+ if ((clnt = nlm_bind_host(host, req->a_resport)) == NULL)
return -ENOLCK;

/* Perform the RPC call. If an error occurs, try again */
@@ -328,7 +331,7 @@
nlm_procname(proc), host->h_name);

/* If we have no RPC client yet, create one. */
- if ((clnt = nlm_bind_host(host)) == NULL)
+ if ((clnt = nlm_bind_host(host, req->a_resport)) == NULL)
return -ENOLCK;

/* bootstrap and kick off the async RPC call */
@@ -356,7 +359,7 @@
nlm_procname(proc), host->h_name);

/* If we have no RPC client yet, create one. */
- if ((clnt = nlm_bind_host(host)) == NULL)
+ if ((clnt = nlm_bind_host(host, req->a_resport)) == NULL)
return -ENOLCK;

/* bootstrap and kick off the async RPC call */
diff -ur -X dontdiff linux-2.4.9-18.3/fs/lockd/host.c linux-2.4.9-18.3-p3/fs/lockd/host.c
--- linux-2.4.9-18.3/fs/lockd/host.c Tue Dec 18 13:00:49 2001
+++ linux-2.4.9-18.3-p3/fs/lockd/host.c Mon Jan 7 12:34:26 2002
@@ -163,7 +163,7 @@
* Create the NLM RPC client for an NLM peer
*/
struct rpc_clnt *
-nlm_bind_host(struct nlm_host *host)
+nlm_bind_host(struct nlm_host *host, int resport)
{
struct rpc_clnt *clnt;
struct rpc_xprt *xprt;
@@ -187,15 +187,19 @@
host->h_nextrebind - jiffies);
}
} else {
- uid_t saved_fsuid = current->fsuid;
- kernel_cap_t saved_cap = current->cap_effective;
+ if (resport) {
+ uid_t saved_fsuid = current->fsuid;
+ kernel_cap_t saved_cap = current->cap_effective;

- /* Create RPC socket as root user so we get a priv port */
- current->fsuid = 0;
- cap_raise (current->cap_effective, CAP_NET_BIND_SERVICE);
- xprt = xprt_create_proto(host->h_proto, &host->h_addr, NULL);
- current->fsuid = saved_fsuid;
- current->cap_effective = saved_cap;
+ /* Create RPC socket as root user so we get a priv port */
+ current->fsuid = 0;
+ cap_raise (current->cap_effective, CAP_NET_BIND_SERVICE);
+ xprt = xprt_create_proto(host->h_proto, &host->h_addr, NULL, 1);
+ current->fsuid = saved_fsuid;
+ current->cap_effective = saved_cap;
+ } else {
+ xprt = xprt_create_proto(host->h_proto, &host->h_addr, NULL, 0);
+ }
if (xprt == NULL)
goto forgetit;

diff -ur -X dontdiff linux-2.4.9-18.3/fs/lockd/mon.c linux-2.4.9-18.3-p3/fs/lockd/mon.c
--- linux-2.4.9-18.3/fs/lockd/mon.c Tue Dec 18 13:00:49 2001
+++ linux-2.4.9-18.3-p3/fs/lockd/mon.c Sun Jan 6 01:08:03 2002
@@ -110,7 +110,7 @@
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sin.sin_port = 0;

- xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL);
+ xprt = xprt_create_proto(IPPROTO_UDP, &sin, NULL, 1);
if (!xprt)
goto out;

diff -ur -X dontdiff linux-2.4.9-18.3/fs/nfs/inode.c linux-2.4.9-18.3-p3/fs/nfs/inode.c
--- linux-2.4.9-18.3/fs/nfs/inode.c Tue Dec 18 13:01:21 2001
+++ linux-2.4.9-18.3-p3/fs/nfs/inode.c Mon Jan 7 13:31:06 2002
@@ -351,7 +351,7 @@

/* Now create transport and client */
xprt = xprt_create_proto(tcp? IPPROTO_TCP : IPPROTO_UDP,
- &srvaddr, &timeparms);
+ &srvaddr, &timeparms, (data->flags & NFS_MOUNT_NORES) == 0);
if (xprt == NULL)
goto out_no_xprt;

diff -ur -X dontdiff linux-2.4.9-18.3/fs/nfs/mount_clnt.c linux-2.4.9-18.3-p3/fs/nfs/mount_clnt.c
--- linux-2.4.9-18.3/fs/nfs/mount_clnt.c Tue Dec 18 13:00:49 2001
+++ linux-2.4.9-18.3-p3/fs/nfs/mount_clnt.c Sun Jan 6 01:07:12 2002
@@ -82,7 +82,7 @@
struct rpc_xprt *xprt;
struct rpc_clnt *clnt;

- if (!(xprt = xprt_create_proto(IPPROTO_UDP, srvaddr, NULL)))
+ if (!(xprt = xprt_create_proto(IPPROTO_UDP, srvaddr, NULL, 1)))
return NULL;

clnt = rpc_create_client(xprt, hostname,
diff -ur -X dontdiff linux-2.4.9-18.3/fs/super.c linux-2.4.9-18.3-p3/fs/super.c
--- linux-2.4.9-18.3/fs/super.c Tue Dec 18 13:00:59 2001
+++ linux-2.4.9-18.3-p3/fs/super.c Wed Dec 19 10:56:35 2001
@@ -516,27 +516,57 @@
* filesystems which don't use real block-devices. -- jrs
*/

-static unsigned long unnamed_dev_in_use[256/(8*sizeof(unsigned long))];
+static int unnamed_dev_majors[] = {
+ UNNAMED_MAJOR,
+#ifdef CONFIG_MORE_UNNAMED_MAJORS /* Always on, keeps Configure.help */
+ 12, 14, 38, 39,
+#endif
+};
+#define UNNAMED_NMAJ (sizeof(unnamed_dev_majors)/sizeof(int))
+
+static int unnamed_dev_nmaj = 1;
+static int unnamed_maj_in_use[UNNAMED_NMAJ] = { UNNAMED_MAJOR, };
+static unsigned long unnamed_dev_in_use[(UNNAMED_NMAJ*256)/(8*sizeof(long))];
+
+#ifdef CONFIG_MORE_UNNAMED_MAJORS
+void majorhog_init(void);
+#endif

kdev_t get_unnamed_dev(void)
{
int i;

- for (i = 1; i < 256; i++) {
+#ifdef CONFIG_MORE_UNNAMED_MAJORS
+ if (!test_and_set_bit(0, unnamed_maj_in_use)) { /* first call */
+ /* relatively SMP safe: only adds majors and does it once */
+ majorhog_init();
+ }
+#endif
+
+ /* find_first_zero_bit isn't atomic */
+ for (i = 1; i < unnamed_dev_nmaj*256; i++) {
if (!test_and_set_bit(i,unnamed_dev_in_use))
- return MKDEV(UNNAMED_MAJOR, i);
+ return MKDEV(unnamed_maj_in_use[i/256], i & 255);
}
+
return 0;
}

void put_unnamed_dev(kdev_t dev)
{
- if (!dev || MAJOR(dev) != UNNAMED_MAJOR)
- return;
- if (test_and_clear_bit(MINOR(dev), unnamed_dev_in_use))
+ int i;
+
+ if (!dev)
return;
- printk("VFS: put_unnamed_dev: freeing unused device %s\n",
- kdevname(dev));
+ for (i = 0; i < unnamed_dev_nmaj; i++) {
+ if (unnamed_maj_in_use[i] == MAJOR(dev)) {
+ if (test_and_clear_bit(i * 256 + MINOR(dev), unnamed_dev_in_use))
+ return;
+ printk("VFS: put_unnamed_dev: freeing unused device %s\n",
+ kdevname(dev));
+ return;
+ }
+ }
}

static int grab_super(struct super_block *sb)
@@ -1090,3 +1120,41 @@
return;
}
}
+
+#ifdef CONFIG_MORE_UNNAMED_MAJORS
+
+/* #include <linux/major.h> */
+/* #include <linux/errno.h> */
+/* #include <linux/fs.h> */
+#include <linux/devfs_fs_kernel.h>
+
+static int majorhog_open(struct inode *inode, struct file *file)
+{
+ return -EDOM; /* Something rididculous for identification */
+}
+
+static struct block_device_operations majorhog_fops = {
+ open: majorhog_open,
+};
+
+void majorhog_init(void)
+{
+ int i, j;
+
+ if (unnamed_dev_nmaj != 1)
+ return;
+
+ j = 1;
+ for (i = 1; i < UNNAMED_NMAJ; i++) {
+ if (devfs_register_blkdev(unnamed_dev_majors[i],
+ "unnamed", &majorhog_fops) == 0) {
+ unnamed_maj_in_use[j++] = unnamed_dev_majors[i];
+ } else {
+ printk(KERN_WARNING "Unable to hog major number %d\n",
+ unnamed_dev_majors[i]);
+ }
+ }
+ unnamed_dev_nmaj = j;
+}
+
+#endif /* CONFIG_MORE_UNNAMED_MAJORS */
diff -ur -X dontdiff linux-2.4.9-18.3/include/linux/lockd/lockd.h linux-2.4.9-18.3-p3/include/linux/lockd/lockd.h
--- linux-2.4.9-18.3/include/linux/lockd/lockd.h Wed Aug 15 14:24:26 2001
+++ linux-2.4.9-18.3-p3/include/linux/lockd/lockd.h Mon Jan 7 12:42:58 2002
@@ -63,6 +63,7 @@
#define NLMCLNT_OHSIZE (sizeof(system_utsname.nodename)+10)
struct nlm_rqst {
unsigned int a_flags; /* initial RPC task flags */
+ int a_resport;
struct nlm_host * a_host; /* host handle */
struct nlm_args a_args; /* arguments */
struct nlm_res a_res; /* result */
@@ -144,7 +145,7 @@
struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *);
struct nlm_host * nlm_lookup_host(struct svc_client *,
struct sockaddr_in *, int, int);
-struct rpc_clnt * nlm_bind_host(struct nlm_host *);
+struct rpc_clnt * nlm_bind_host(struct nlm_host *, int);
void nlm_rebind_host(struct nlm_host *);
struct nlm_host * nlm_get_host(struct nlm_host *);
void nlm_release_host(struct nlm_host *);
diff -ur -X dontdiff linux-2.4.9-18.3/include/linux/nfs_mount.h linux-2.4.9-18.3-p3/include/linux/nfs_mount.h
--- linux-2.4.9-18.3/include/linux/nfs_mount.h Tue Dec 18 13:00:52 2001
+++ linux-2.4.9-18.3-p3/include/linux/nfs_mount.h Sun Jan 6 01:10:53 2002
@@ -54,6 +54,7 @@
#define NFS_MOUNT_KERBEROS 0x0100 /* 3 */
#define NFS_MOUNT_NONLM 0x0200 /* 3 */
#define NFS_MOUNT_BROKEN_SUID 0x0400 /* 4 */
+#define NFS_MOUNT_NORES 0x0800 /* ? XXX */
#define NFS_MOUNT_FLAGMASK 0xFFFF

#endif
diff -ur -X dontdiff linux-2.4.9-18.3/include/linux/sunrpc/xprt.h linux-2.4.9-18.3-p3/include/linux/sunrpc/xprt.h
--- linux-2.4.9-18.3/include/linux/sunrpc/xprt.h Wed Aug 15 14:24:26 2001
+++ linux-2.4.9-18.3-p3/include/linux/sunrpc/xprt.h Mon Jan 7 01:48:40 2002
@@ -143,7 +143,8 @@
nocong : 1, /* no congestion control */
stream : 1, /* TCP */
tcp_more : 1, /* more record fragments */
- connecting : 1; /* being reconnected */
+ connecting : 1, /* being reconnected */
+ resport : 1; /* use reserved port */

/*
* State of TCP reply receive stuff
@@ -171,7 +172,8 @@
#ifdef __KERNEL__

struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in *addr,
- struct rpc_timeout *toparms);
+ struct rpc_timeout *toparms,
+ int use_res_port);
int xprt_destroy(struct rpc_xprt *);
void xprt_shutdown(struct rpc_xprt *);
void xprt_default_timeout(struct rpc_timeout *, int);
diff -ur -X dontdiff linux-2.4.9-18.3/net/sunrpc/pmap_clnt.c linux-2.4.9-18.3-p3/net/sunrpc/pmap_clnt.c
--- linux-2.4.9-18.3/net/sunrpc/pmap_clnt.c Wed Jun 21 12:43:37 2000
+++ linux-2.4.9-18.3-p3/net/sunrpc/pmap_clnt.c Mon Jan 7 12:59:54 2002
@@ -189,7 +189,7 @@
struct rpc_clnt *clnt;

/* printk("pmap: create xprt\n"); */
- if (!(xprt = xprt_create_proto(proto, srvaddr, NULL)))
+ if (!(xprt = xprt_create_proto(proto, srvaddr, NULL, 0)))
return NULL;
xprt->addr.sin_port = htons(RPC_PMAP_PORT);

diff -ur -X dontdiff linux-2.4.9-18.3/net/sunrpc/xprt.c linux-2.4.9-18.3-p3/net/sunrpc/xprt.c
--- linux-2.4.9-18.3/net/sunrpc/xprt.c Tue Dec 18 13:00:54 2001
+++ linux-2.4.9-18.3-p3/net/sunrpc/xprt.c Mon Jan 7 13:26:30 2002
@@ -97,7 +97,7 @@
static void xprt_reserve_status(struct rpc_task *task);
static void xprt_disconnect(struct rpc_xprt *);
static void xprt_reconn_status(struct rpc_task *task);
-static struct socket *xprt_create_socket(int, struct rpc_timeout *);
+static struct socket *xprt_create_socket(int, struct rpc_timeout *, int);
static int xprt_bind_socket(struct rpc_xprt *, struct socket *);
static void xprt_remove_pending(struct rpc_xprt *);

@@ -434,7 +434,8 @@
status = -ENOTCONN;
if (!inet) {
/* Create an unconnected socket */
- if (!(sock = xprt_create_socket(xprt->prot, &xprt->timeout)))
+ if (!(sock = xprt_create_socket(xprt->prot, &xprt->timeout,
+ xprt->resport)))
goto defer;
xprt_bind_socket(xprt, sock);
inet = sock->sk;
@@ -1459,7 +1460,7 @@
*/
static struct rpc_xprt *
xprt_setup(struct socket *sock, int proto,
- struct sockaddr_in *ap, struct rpc_timeout *to)
+ struct sockaddr_in *ap, struct rpc_timeout *to, int use_resport)
{
struct rpc_xprt *xprt;
struct rpc_rqst *req;
@@ -1504,6 +1505,8 @@

INIT_LIST_HEAD(&xprt->rx_pending);

+ xprt->resport = use_resport;
+
dprintk("RPC: created transport %p\n", xprt);

xprt_bind_socket(xprt, sock);
@@ -1574,7 +1577,7 @@
* Create a client socket given the protocol and peer address.
*/
static struct socket *
-xprt_create_socket(int proto, struct rpc_timeout *to)
+xprt_create_socket(int proto, struct rpc_timeout *to, int resport)
{
struct socket *sock;
int type, err;
@@ -1590,7 +1593,8 @@
}

/* If the caller has the capability, bind to a reserved port */
- if (capable(CAP_NET_BIND_SERVICE) && xprt_bindresvport(sock) < 0)
+ if (resport &&
+ capable(CAP_NET_BIND_SERVICE) && xprt_bindresvport(sock) < 0)
goto failed;

return sock;
@@ -1604,17 +1608,18 @@
* Create an RPC client transport given the protocol and peer address.
*/
struct rpc_xprt *
-xprt_create_proto(int proto, struct sockaddr_in *sap, struct rpc_timeout *to)
+xprt_create_proto(int proto, struct sockaddr_in *sap, struct rpc_timeout *to,
+ int use_resport)
{
struct socket *sock;
struct rpc_xprt *xprt;

dprintk("RPC: xprt_create_proto called\n");

- if (!(sock = xprt_create_socket(proto, to)))
+ if (!(sock = xprt_create_socket(proto, to, use_resport)))
return NULL;

- if (!(xprt = xprt_setup(sock, proto, sap, to)))
+ if (!(xprt = xprt_setup(sock, proto, sap, to, use_resport)))
sock_release(sock);

return xprt;
-
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