mount: move code from nfsmount.c into mount.c

1 files changed, 1018 insertions, 5 deletions

diff --git a/util-linux/mount.c b/util-linux/mount.c
index 4ed000e..5592a7a 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -84,10 +84,10 @@ struct {
 	{"ro", MS_RDONLY},        // vfs flag
 	{"rw", ~MS_RDONLY},       // vfs flag
 	{"remount", MS_REMOUNT},  // action flag
-
-
 };
 
+static int nfsmount(struct mntent *mp, int vfsflags, char *filteropts);
+
 /* Append mount options to string */
 static void append_mount_options(char **oldopts, char *newopts)
 {
@@ -196,7 +196,7 @@ static int fakeIt;
 #endif
 
 // Perform actual mount of specific filesystem at specific location.
-int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
+static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
 {
 	int rc;
 
@@ -234,7 +234,7 @@ int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
 		// Add vfs string flags
 
 		for(i=0; mount_options[i].flags != MS_REMOUNT; i++)
-			if (mount_options[i].flags > 0 && (mount_options[i].flags&vfsflags))
+			if (mount_options[i].flags > 0 && (mount_options[i].flags & vfsflags))
 				append_mount_options(&(mp->mnt_opts), mount_options[i].name);
 
 		// Remove trailing / (if any) from directory we mounted on
@@ -260,8 +260,8 @@ int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
 				mp->mnt_fsname = srcbuf;
 			}
 			mp->mnt_type = "none";
-			mp->mnt_freq = mp->mnt_passno = 0;
 		}
+		mp->mnt_freq = mp->mnt_passno = 0;
 
 		// Write and close.
 
@@ -613,3 +613,1016 @@ clean_up:
 
 	return rc;
 }
+
+
+#if ENABLE_FEATURE_MOUNT_NFS
+
+/*
+ * Linux NFS mount
+ * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ *
+ * Wed Feb  8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
+ * numbers to be specified on the command line.
+ *
+ * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
+ * Omit the call to connect() for Linux version 1.3.11 or later.
+ *
+ * Wed Oct  1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
+ * Implemented the "bg", "fg" and "retry" mount options for NFS.
+ *
+ * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
+ * - added Native Language Support
+ *
+ * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
+ * plus NFSv3 stuff.
+ */
+
+#include <syslog.h>
+#include <sys/utsname.h>
+#undef TRUE
+#undef FALSE
+#include <rpc/rpc.h>
+#include <rpc/pmap_prot.h>
+#include <rpc/pmap_clnt.h>
+
+/* This is just a warning of a common mistake.  Possibly this should be a
+ * uclibc faq entry rather than in busybox... */
+#if ENABLE_FEATURE_MOUNT_NFS && defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
+#error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support."
+#endif
+
+#define MOUNTPORT 635
+#define MNTPATHLEN 1024
+#define MNTNAMLEN 255
+#define FHSIZE 32
+#define FHSIZE3 64
+
+typedef char fhandle[FHSIZE];
+
+typedef struct {
+	unsigned int fhandle3_len;
+	char *fhandle3_val;
+} fhandle3;
+
+enum mountstat3 {
+	MNT_OK = 0,
+	MNT3ERR_PERM = 1,
+	MNT3ERR_NOENT = 2,
+	MNT3ERR_IO = 5,
+	MNT3ERR_ACCES = 13,
+	MNT3ERR_NOTDIR = 20,
+	MNT3ERR_INVAL = 22,
+	MNT3ERR_NAMETOOLONG = 63,
+	MNT3ERR_NOTSUPP = 10004,
+	MNT3ERR_SERVERFAULT = 10006,
+};
+typedef enum mountstat3 mountstat3;
+
+struct fhstatus {
+	unsigned int fhs_status;
+	union {
+		fhandle fhs_fhandle;
+	} fhstatus_u;
+};
+typedef struct fhstatus fhstatus;
+
+struct mountres3_ok {
+	fhandle3 fhandle;
+	struct {
+		unsigned int auth_flavours_len;
+		char *auth_flavours_val;
+	} auth_flavours;
+};
+typedef struct mountres3_ok mountres3_ok;
+
+struct mountres3 {
+	mountstat3 fhs_status;
+	union {
+		mountres3_ok mountinfo;
+	} mountres3_u;
+};
+typedef struct mountres3 mountres3;
+
+typedef char *dirpath;
+
+typedef char *name;
+
+typedef struct mountbody *mountlist;
+
+struct mountbody {
+	name ml_hostname;
+	dirpath ml_directory;
+	mountlist ml_next;
+};
+typedef struct mountbody mountbody;
+
+typedef struct groupnode *groups;
+
+struct groupnode {
+	name gr_name;
+	groups gr_next;
+};
+typedef struct groupnode groupnode;
+
+typedef struct exportnode *exports;
+
+struct exportnode {
+	dirpath ex_dir;
+	groups ex_groups;
+	exports ex_next;
+};
+typedef struct exportnode exportnode;
+
+struct ppathcnf {
+	int pc_link_max;
+	short pc_max_canon;
+	short pc_max_input;
+	short pc_name_max;
+	short pc_path_max;
+	short pc_pipe_buf;
+	u_char pc_vdisable;
+	char pc_xxx;
+	short pc_mask[2];
+};
+typedef struct ppathcnf ppathcnf;
+
+#define MOUNTPROG 100005
+#define MOUNTVERS 1
+
+#define MOUNTPROC_NULL 0
+#define MOUNTPROC_MNT 1
+#define MOUNTPROC_DUMP 2
+#define MOUNTPROC_UMNT 3
+#define MOUNTPROC_UMNTALL 4
+#define MOUNTPROC_EXPORT 5
+#define MOUNTPROC_EXPORTALL 6
+
+#define MOUNTVERS_POSIX 2
+
+#define MOUNTPROC_PATHCONF 7
+
+#define MOUNT_V3 3
+
+#define MOUNTPROC3_NULL 0
+#define MOUNTPROC3_MNT 1
+#define MOUNTPROC3_DUMP 2
+#define MOUNTPROC3_UMNT 3
+#define MOUNTPROC3_UMNTALL 4
+#define MOUNTPROC3_EXPORT 5
+
+enum {
+#ifndef NFS_FHSIZE
+	NFS_FHSIZE = 32,
+#endif
+#ifndef NFS_PORT
+	NFS_PORT = 2049
+#endif
+};
+
+
+/*
+ * We want to be able to compile mount on old kernels in such a way
+ * that the binary will work well on more recent kernels.
+ * Thus, if necessary we teach nfsmount.c the structure of new fields
+ * that will come later.
+ *
+ * Moreover, the new kernel includes conflict with glibc includes
+ * so it is easiest to ignore the kernel altogether (at compile time).
+ */
+
+struct nfs2_fh {
+	char                    data[32];
+};
+struct nfs3_fh {
+	unsigned short          size;
+	unsigned char           data[64];
+};
+
+struct nfs_mount_data {
+	int		version;		/* 1 */
+	int		fd;			/* 1 */
+	struct nfs2_fh	old_root;		/* 1 */
+	int		flags;			/* 1 */
+	int		rsize;			/* 1 */
+	int		wsize;			/* 1 */
+	int		timeo;			/* 1 */
+	int		retrans;		/* 1 */
+	int		acregmin;		/* 1 */
+	int		acregmax;		/* 1 */
+	int		acdirmin;		/* 1 */
+	int		acdirmax;		/* 1 */
+	struct sockaddr_in addr;		/* 1 */
+	char		hostname[256];		/* 1 */
+	int		namlen;			/* 2 */
+	unsigned int	bsize;			/* 3 */
+	struct nfs3_fh	root;			/* 4 */
+};
+
+/* bits in the flags field */
+enum {
+	NFS_MOUNT_SOFT = 0x0001,	/* 1 */
+	NFS_MOUNT_INTR = 0x0002,	/* 1 */
+	NFS_MOUNT_SECURE = 0x0004,	/* 1 */
+	NFS_MOUNT_POSIX = 0x0008,	/* 1 */
+	NFS_MOUNT_NOCTO = 0x0010,	/* 1 */
+	NFS_MOUNT_NOAC = 0x0020,	/* 1 */
+	NFS_MOUNT_TCP = 0x0040,		/* 2 */
+	NFS_MOUNT_VER3 = 0x0080,	/* 3 */
+	NFS_MOUNT_KERBEROS = 0x0100,	/* 3 */
+	NFS_MOUNT_NONLM = 0x0200	/* 3 */
+};
+
+
+/*
+ * We need to translate between nfs status return values and
+ * the local errno values which may not be the same.
+ *
+ * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
+ * "after #include <errno.h> the symbol errno is reserved for any use,
+ *  it cannot even be used as a struct tag or field name".
+ */
+
+#ifndef EDQUOT
+#define EDQUOT	ENOSPC
+#endif
+
+// Convert each NFSERR_BLAH into EBLAH
+
+static const struct {
+	int stat;
+	int errnum;
+} nfs_errtbl[] = {
+	{0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST},
+	{19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG},
+	{28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT},
+	{70,ESTALE}, {71,EREMOTE}, {-1,EIO}
+};
+
+static char *nfs_strerror(int status)
+{
+	int i;
+	static char buf[256];
+
+	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
+		if (nfs_errtbl[i].stat == status)
+			return strerror(nfs_errtbl[i].errnum);
+	}
+	sprintf(buf, "unknown nfs status return value: %d", status);
+	return buf;
+}
+
+static bool_t xdr_fhandle(XDR *xdrs, fhandle objp)
+{
+	if (!xdr_opaque(xdrs, objp, FHSIZE))
+		 return FALSE;
+	return TRUE;
+}
+
+static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp)
+{
+	if (!xdr_u_int(xdrs, &objp->fhs_status))
+		 return FALSE;
+	switch (objp->fhs_status) {
+	case 0:
+		if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle))
+			 return FALSE;
+		break;
+	default:
+		break;
+	}
+	return TRUE;
+}
+
+static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp)
+{
+	if (!xdr_string(xdrs, objp, MNTPATHLEN))
+		 return FALSE;
+	return TRUE;
+}
+
+static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp)
+{
+	if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3))
+		 return FALSE;
+	return TRUE;
+}
+
+static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp)
+{
+	if (!xdr_fhandle3(xdrs, &objp->fhandle))
+		return FALSE;
+	if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0,
+				sizeof (int), (xdrproc_t) xdr_int))
+		return FALSE;
+	return TRUE;
+}
+
+static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp)
+{
+	if (!xdr_enum(xdrs, (enum_t *) objp))
+		 return FALSE;
+	return TRUE;
+}
+
+static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp)
+{
+	if (!xdr_mountstat3(xdrs, &objp->fhs_status))
+		return FALSE;
+	switch (objp->fhs_status) {
+	case MNT_OK:
+		if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo))
+			 return FALSE;
+		break;
+	default:
+		break;
+	}
+	return TRUE;
+}
+
+#define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
+
+/*
+ * nfs_mount_version according to the sources seen at compile time.
+ */
+static int nfs_mount_version;
+static int kernel_version;
+
+/*
+ * Unfortunately, the kernel prints annoying console messages
+ * in case of an unexpected nfs mount version (instead of
+ * just returning some error).  Therefore we'll have to try
+ * and figure out what version the kernel expects.
+ *
+ * Variables:
+ *	KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
+ *	NFS_MOUNT_VERSION: these nfsmount sources at compile time
+ *	nfs_mount_version: version this source and running kernel can handle
+ */
+static void
+find_kernel_nfs_mount_version(void)
+{
+	if (kernel_version)
+		return;
+
+	nfs_mount_version = 4; /* default */
+
+	kernel_version = get_linux_version_code();
+	if (kernel_version) {
+		if (kernel_version < KERNEL_VERSION(2,1,32))
+			nfs_mount_version = 1;
+		else if (kernel_version < KERNEL_VERSION(2,2,18) ||
+				(kernel_version >= KERNEL_VERSION(2,3,0) &&
+				 kernel_version < KERNEL_VERSION(2,3,99)))
+			nfs_mount_version = 3;
+		/* else v4 since 2.3.99pre4 */
+	}
+}
+
+static struct pmap *
+get_mountport(struct sockaddr_in *server_addr,
+	long unsigned prog,
+	long unsigned version,
+	long unsigned proto,
+	long unsigned port)
+{
+	struct pmaplist *pmap;
+	static struct pmap p = {0, 0, 0, 0};
+
+	server_addr->sin_port = PMAPPORT;
+	pmap = pmap_getmaps(server_addr);
+
+	if (version > MAX_NFSPROT)
+		version = MAX_NFSPROT;
+	if (!prog)
+		prog = MOUNTPROG;
+	p.pm_prog = prog;
+	p.pm_vers = version;
+	p.pm_prot = proto;
+	p.pm_port = port;
+	
+	while (pmap) {
+		if (pmap->pml_map.pm_prog != prog)
+			goto next;
+		if (!version && p.pm_vers > pmap->pml_map.pm_vers)
+			goto next;
+		if (version > 2 && pmap->pml_map.pm_vers != version)
+			goto next;
+		if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
+			goto next;
+		if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
+		    (proto && p.pm_prot && pmap->pml_map.pm_prot != proto) ||
+		    (port && pmap->pml_map.pm_port != port))
+			goto next;
+		memcpy(&p, &pmap->pml_map, sizeof(p));
+next:
+		pmap = pmap->pml_next;
+	}
+	if (!p.pm_vers)
+		p.pm_vers = MOUNTVERS;
+	if (!p.pm_port)
+		p.pm_port = MOUNTPORT;
+	if (!p.pm_prot)
+		p.pm_prot = IPPROTO_TCP;
+	return &p;
+}
+
+static int daemonize(void)
+{
+	int fd;
+	int pid = fork();
+	if (pid < 0) /* error */
+		return -errno;
+	if (pid > 0) /* parent */
+		return 0;
+	/* child */
+	fd = xopen(bb_dev_null, O_RDWR);
+	dup2(fd, 0);
+	dup2(fd, 1);
+	dup2(fd, 2);
+	if (fd > 2) close(fd);
+	setsid();
+	openlog(bb_applet_name, LOG_PID, LOG_DAEMON);
+	logmode = LOGMODE_SYSLOG;
+	return 1;
+}
+
+// TODO
+static inline int we_saw_this_host_before(const char *hostname)
+{
+	return 0;
+}
+
+/* RPC strerror analogs are terminally idiotic:
+ * *mandatory* prefix and \n at end.
+ * This hopefully helps. Usage:
+ * error_msg_rpc(clnt_*error*(" ")) */
+static void error_msg_rpc(const char *msg)
+{
+	size_t len;
+	while (msg[0] == ' ' || msg[0] == ':') msg++;
+	len = strlen(msg);
+	while (len && msg[len-1] == '\n') len--;
+	bb_error_msg("%.*s", len, msg);
+}
+
+static int nfsmount(struct mntent *mp, int vfsflags, char *filteropts)
+{
+	CLIENT *mclient;
+	char *hostname;
+	char *pathname;
+	char *mounthost;
+	struct nfs_mount_data data;
+	char *opt;
+	struct hostent *hp;
+	struct sockaddr_in server_addr;
+	struct sockaddr_in mount_server_addr;
+	int msock, fsock;
+	union {
+		struct fhstatus nfsv2;
+		struct mountres3 nfsv3;
+	} status;
+	int daemonized;
+	char *s;
+	int port;
+	int mountport;
+	int proto;
+	int bg;
+	int soft;
+	int intr;
+	int posix;
+	int nocto;
+	int noac;
+	int nolock;
+	int retry;
+	int tcp;
+	int mountprog;
+	int mountvers;
+	int nfsprog;
+	int nfsvers;
+	int retval;
+
+	find_kernel_nfs_mount_version();
+
+	daemonized = 0;
+	mounthost = NULL;
+	retval = ETIMEDOUT;
+	msock = fsock = -1;
+	mclient = NULL;
+
+	/* NB: hostname, mounthost, filteropts must be free()d prior to return */
+
+	filteropts = xstrdup(filteropts); /* going to trash it later... */
+
+	hostname = xstrdup(mp->mnt_fsname);
+	/* mount_main() guarantees that ':' is there */
+	s = strchr(hostname, ':');
+	pathname = s + 1;
+	*s = '\0';
+	/* Ignore all but first hostname in replicated mounts
+	   until they can be fully supported. (mack@sgi.com) */
+	s = strchr(hostname, ',');
+	if (s) {
+		*s = '\0';
+		bb_error_msg("warning: multiple hostnames not supported");
+	}
+
+	server_addr.sin_family = AF_INET;
+	if (!inet_aton(hostname, &server_addr.sin_addr)) {
+		hp = gethostbyname(hostname);
+		if (hp == NULL) {
+			bb_herror_msg("%s", hostname);
+			goto fail;
+		}
+		if (hp->h_length > sizeof(struct in_addr)) {
+			bb_error_msg("got bad hp->h_length");
+			hp->h_length = sizeof(struct in_addr);
+		}
+		memcpy(&server_addr.sin_addr,
+				hp->h_addr, hp->h_length);
+	}
+
+	memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr));
+
+	/* add IP address to mtab options for use when unmounting */
+
+	if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */
+		mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr));
+	} else {
+		char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts,
+					mp->mnt_opts[0] ? "," : "",
+					inet_ntoa(server_addr.sin_addr));
+		free(mp->mnt_opts);
+		mp->mnt_opts = tmp;
+	}
+
+	/* Set default options.
+	 * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
+	 * let the kernel decide.
+	 * timeo is filled in after we know whether it'll be TCP or UDP. */
+	memset(&data, 0, sizeof(data));
+	data.retrans	= 3;
+	data.acregmin	= 3;
+	data.acregmax	= 60;
+	data.acdirmin	= 30;
+	data.acdirmax	= 60;
+	data.namlen	= NAME_MAX;
+
+	bg = 0;
+	soft = 0;
+	intr = 0;
+	posix = 0;
+	nocto = 0;
+	nolock = 0;
+	noac = 0;
+	retry = 10000;		/* 10000 minutes ~ 1 week */
+	tcp = 0;
+
+	mountprog = MOUNTPROG;
+	mountvers = 0;
+	port = 0;
+	mountport = 0;
+	nfsprog = 100003;
+	nfsvers = 0;
+
+	/* parse options */
+
+	for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
+		char *opteq = strchr(opt, '=');
+		if (opteq) {
+			int val = atoi(opteq + 1);
+			*opteq = '\0';
+			if (!strcmp(opt, "rsize"))
+				data.rsize = val;
+			else if (!strcmp(opt, "wsize"))
+				data.wsize = val;
+			else if (!strcmp(opt, "timeo"))
+				data.timeo = val;
+			else if (!strcmp(opt, "retrans"))
+				data.retrans = val;
+			else if (!strcmp(opt, "acregmin"))
+				data.acregmin = val;
+			else if (!strcmp(opt, "acregmax"))
+				data.acregmax = val;
+			else if (!strcmp(opt, "acdirmin"))
+				data.acdirmin = val;
+			else if (!strcmp(opt, "acdirmax"))
+				data.acdirmax = val;
+			else if (!strcmp(opt, "actimeo")) {
+				data.acregmin = val;
+				data.acregmax = val;
+				data.acdirmin = val;
+				data.acdirmax = val;
+			}
+			else if (!strcmp(opt, "retry"))
+				retry = val;
+			else if (!strcmp(opt, "port"))
+				port = val;
+			else if (!strcmp(opt, "mountport"))
+				mountport = val;
+			else if (!strcmp(opt, "mounthost"))
+				mounthost = xstrndup(opteq+1,
+						  strcspn(opteq+1," \t\n\r,"));
+			else if (!strcmp(opt, "mountprog"))
+				mountprog = val;
+			else if (!strcmp(opt, "mountvers"))
+				mountvers = val;
+			else if (!strcmp(opt, "nfsprog"))
+				nfsprog = val;
+			else if (!strcmp(opt, "nfsvers") ||
+				 !strcmp(opt, "vers"))
+				nfsvers = val;
+			else if (!strcmp(opt, "proto")) {
+				if (!strncmp(opteq+1, "tcp", 3))
+					tcp = 1;
+				else if (!strncmp(opteq+1, "udp", 3))
+					tcp = 0;
+				else
+					bb_error_msg("warning: unrecognized proto= option");
+			} else if (!strcmp(opt, "namlen")) {
+				if (nfs_mount_version >= 2)
+					data.namlen = val;
+				else
+					bb_error_msg("warning: option namlen is not supported\n");
+			} else if (!strcmp(opt, "addr"))
+				/* ignore */;
+			else {
+				bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val);
+				goto fail;
+			}
+		}
+		else {
+			int val = 1;
+			if (!strncmp(opt, "no", 2)) {
+				val = 0;
+				opt += 2;
+			}
+			if (!strcmp(opt, "bg"))
+				bg = val;
+			else if (!strcmp(opt, "fg"))
+				bg = !val;
+			else if (!strcmp(opt, "soft"))
+				soft = val;
+			else if (!strcmp(opt, "hard"))
+				soft = !val;
+			else if (!strcmp(opt, "intr"))
+				intr = val;
+			else if (!strcmp(opt, "posix"))
+				posix = val;
+			else if (!strcmp(opt, "cto"))
+				nocto = !val;
+			else if (!strcmp(opt, "ac"))
+				noac = !val;
+			else if (!strcmp(opt, "tcp"))
+				tcp = val;
+			else if (!strcmp(opt, "udp"))
+				tcp = !val;
+			else if (!strcmp(opt, "lock")) {
+				if (nfs_mount_version >= 3)
+					nolock = !val;
+				else
+					bb_error_msg("warning: option nolock is not supported");
+			} else {
+				bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt);
+				goto fail;
+			}
+		}
+	}
+	proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
+
+	data.flags = (soft ? NFS_MOUNT_SOFT : 0)
+		| (intr ? NFS_MOUNT_INTR : 0)
+		| (posix ? NFS_MOUNT_POSIX : 0)
+		| (nocto ? NFS_MOUNT_NOCTO : 0)
+		| (noac ? NFS_MOUNT_NOAC : 0);
+	if (nfs_mount_version >= 2)
+		data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
+	if (nfs_mount_version >= 3)
+		data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
+	if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) {
+		bb_error_msg("NFSv%d not supported", nfsvers);
+		goto fail;
+	}
+	if (nfsvers && !mountvers)
+		mountvers = (nfsvers < 3) ? 1 : nfsvers;
+	if (nfsvers && nfsvers < mountvers) {
+		mountvers = nfsvers;
+	}
+
+	/* Adjust options if none specified */
+	if (!data.timeo)
+		data.timeo = tcp ? 70 : 7;
+
+#ifdef NFS_MOUNT_DEBUG
+	printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
+		data.rsize, data.wsize, data.timeo, data.retrans);
+	printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n",
+		data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
+	printf("port = %d, bg = %d, retry = %d, flags = %.8x\n",
+		port, bg, retry, data.flags);
+	printf("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d\n",
+		mountprog, mountvers, nfsprog, nfsvers);
+	printf("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d\n",
+		(data.flags & NFS_MOUNT_SOFT) != 0,
+		(data.flags & NFS_MOUNT_INTR) != 0,
+		(data.flags & NFS_MOUNT_POSIX) != 0,
+		(data.flags & NFS_MOUNT_NOCTO) != 0,
+		(data.flags & NFS_MOUNT_NOAC) != 0);
+	printf("tcp = %d\n",
+		(data.flags & NFS_MOUNT_TCP) != 0);
+#endif
+
+	data.version = nfs_mount_version;
+
+	if (vfsflags & MS_REMOUNT)
+		goto do_mount;
+
+	/*
+	 * If the previous mount operation on the same host was
+	 * backgrounded, and the "bg" for this mount is also set,
+	 * give up immediately, to avoid the initial timeout.
+	 */
+	if (bg && we_saw_this_host_before(hostname)) {
+		daemonized = daemonize(); /* parent or error */
+		if (daemonized <= 0) { /* parent or error */
+			retval = -daemonized;
+			goto ret;
+		}
+	}
+
+	/* create mount daemon client */
+	/* See if the nfs host = mount host. */
+	if (mounthost) {
+		if (mounthost[0] >= '0' && mounthost[0] <= '9') {
+			mount_server_addr.sin_family = AF_INET;
+			mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
+		} else {
+			hp = gethostbyname(mounthost);
+			if (hp == NULL) {
+				bb_herror_msg("%s", mounthost);
+				goto fail;
+			} else {
+				if (hp->h_length > sizeof(struct in_addr)) {
+					bb_error_msg("got bad hp->h_length?");
+					hp->h_length = sizeof(struct in_addr);
+				}
+				mount_server_addr.sin_family = AF_INET;
+				memcpy(&mount_server_addr.sin_addr,
+						hp->h_addr, hp->h_length);
+			}
+		}
+	}
+
+	/*
+	 * The following loop implements the mount retries. When the mount
+	 * times out, and the "bg" option is set, we background ourself
+	 * and continue trying.
+	 *
+	 * The case where the mount point is not present and the "bg"
+	 * option is set, is treated as a timeout. This is done to
+	 * support nested mounts.
+	 *
+	 * The "retry" count specified by the user is the number of
+	 * minutes to retry before giving up.
+	 */
+	{
+		struct timeval total_timeout;
+		struct timeval retry_timeout;
+		struct pmap* pm_mnt;
+		time_t t;
+		time_t prevt;
+		time_t timeout;
+
+		retry_timeout.tv_sec = 3;
+		retry_timeout.tv_usec = 0;
+		total_timeout.tv_sec = 20;
+		total_timeout.tv_usec = 0;
+		timeout = time(NULL) + 60 * retry;
+		prevt = 0;
+		t = 30;
+retry:
+		/* be careful not to use too many CPU cycles */
+		if (t - prevt < 30)
+			sleep(30);
+
+		pm_mnt = get_mountport(&mount_server_addr,
+				mountprog,
+				mountvers,
+				proto,
+				mountport);
+		nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers;
+
+		/* contact the mount daemon via TCP */
+		mount_server_addr.sin_port = htons(pm_mnt->pm_port);
+		msock = RPC_ANYSOCK;
+
+		switch (pm_mnt->pm_prot) {
+		case IPPROTO_UDP:
+			mclient = clntudp_create(&mount_server_addr,
+						 pm_mnt->pm_prog,
+						 pm_mnt->pm_vers,
+						 retry_timeout,
+						 &msock);
+			if (mclient)
+				break;
+			mount_server_addr.sin_port = htons(pm_mnt->pm_port);
+			msock = RPC_ANYSOCK;
+		case IPPROTO_TCP:
+			mclient = clnttcp_create(&mount_server_addr,
+						 pm_mnt->pm_prog,
+						 pm_mnt->pm_vers,
+						 &msock, 0, 0);
+			break;
+		default:
+			mclient = 0;
+		}
+		if (!mclient) {
+			if (!daemonized && prevt == 0)
+				error_msg_rpc(clnt_spcreateerror(" "));
+		} else {
+			enum clnt_stat clnt_stat;
+			/* try to mount hostname:pathname */
+			mclient->cl_auth = authunix_create_default();
+
+			/* make pointers in xdr_mountres3 NULL so
+			 * that xdr_array allocates memory for us
+			 */
+			memset(&status, 0, sizeof(status));
+
+			if (pm_mnt->pm_vers == 3)
+				clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT,
+					      (xdrproc_t) xdr_dirpath,
+					      (caddr_t) &pathname,
+					      (xdrproc_t) xdr_mountres3,
+					      (caddr_t) &status,
+					      total_timeout);
+			else
+				clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
+					      (xdrproc_t) xdr_dirpath,
+					      (caddr_t) &pathname,
+					      (xdrproc_t) xdr_fhstatus,
+					      (caddr_t) &status,
+					      total_timeout);
+
+			if (clnt_stat == RPC_SUCCESS)
+				goto prepare_kernel_data; /* we're done */
+			if (errno != ECONNREFUSED) {
+				error_msg_rpc(clnt_sperror(mclient, " "));
+				goto fail;	/* don't retry */
+			}
+			/* Connection refused */
+			if (!daemonized && prevt == 0) /* print just once */
+				error_msg_rpc(clnt_sperror(mclient, " "));
+			auth_destroy(mclient->cl_auth);
+			clnt_destroy(mclient);
+			mclient = 0;
+			close(msock);
+		}
+
+		/* Timeout. We are going to retry... maybe */
+
+		if (!bg)
+			goto fail;
+		if (!daemonized) {
+			daemonized = daemonize();
+			if (daemonized <= 0) { /* parent or error */
+				retval = -daemonized;
+				goto ret;
+			}
+		}
+		prevt = t;
+		t = time(NULL);
+		if (t >= timeout)
+			/* TODO error message */
+			goto fail;
+
+		goto retry;
+	}
+
+prepare_kernel_data:
+
+	if (nfsvers == 2) {
+		if (status.nfsv2.fhs_status != 0) {
+			bb_error_msg("%s:%s failed, reason given by server: %s",
+				hostname, pathname,
+				nfs_strerror(status.nfsv2.fhs_status));
+			goto fail;
+		}
+		memcpy(data.root.data,
+				(char *) status.nfsv2.fhstatus_u.fhs_fhandle,
+				NFS_FHSIZE);
+		data.root.size = NFS_FHSIZE;
+		memcpy(data.old_root.data,
+				(char *) status.nfsv2.fhstatus_u.fhs_fhandle,
+				NFS_FHSIZE);
+	} else {
+		fhandle3 *my_fhandle;
+		if (status.nfsv3.fhs_status != 0) {
+			bb_error_msg("%s:%s failed, reason given by server: %s",
+				hostname, pathname,
+				nfs_strerror(status.nfsv3.fhs_status));
+			goto fail;
+		}
+		my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
+		memset(data.old_root.data, 0, NFS_FHSIZE);
+		memset(&data.root, 0, sizeof(data.root));
+		data.root.size = my_fhandle->fhandle3_len;
+		memcpy(data.root.data,
+				(char *) my_fhandle->fhandle3_val,
+				my_fhandle->fhandle3_len);
+
+		data.flags |= NFS_MOUNT_VER3;
+	}
+
+	/* create nfs socket for kernel */
+
+	if (tcp) {
+		if (nfs_mount_version < 3) {
+			bb_error_msg("NFS over TCP is not supported");
+			goto fail;
+		}
+		fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+	} else
+		fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+	if (fsock < 0) {
+		bb_perror_msg("nfs socket");
+		goto fail;
+	}
+	if (bindresvport(fsock, 0) < 0) {
+		bb_perror_msg("nfs bindresvport");
+		goto fail;
+	}
+	if (port == 0) {
+		server_addr.sin_port = PMAPPORT;
+		port = pmap_getport(&server_addr, nfsprog, nfsvers,
+					tcp ? IPPROTO_TCP : IPPROTO_UDP);
+		if (port == 0)
+			port = NFS_PORT;
+#ifdef NFS_MOUNT_DEBUG
+		else
+			printf("used portmapper to find NFS port\n");
+#endif
+	}
+#ifdef NFS_MOUNT_DEBUG
+	printf("using port %d for nfs daemon\n", port);
+#endif
+	server_addr.sin_port = htons(port);
+
+	/* prepare data structure for kernel */
+
+	data.fd = fsock;
+	memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
+	strncpy(data.hostname, hostname, sizeof(data.hostname));
+
+	/* clean up */
+
+	auth_destroy(mclient->cl_auth);
+	clnt_destroy(mclient);
+	close(msock);
+
+	if (bg) {
+		/* We must wait until mount directory is available */
+		struct stat statbuf;
+		int delay = 1;
+		while (stat(mp->mnt_dir, &statbuf) == -1) {
+			if (!daemonized) {
+				daemonized = daemonize();
+				if (daemonized <= 0) { /* parent or error */
+					retval = -daemonized;
+					goto ret;
+				}
+			}
+			sleep(delay);	/* 1, 2, 4, 8, 16, 30, ... */
+			delay *= 2;
+			if (delay > 30)
+				delay = 30;
+		}
+	}
+
+do_mount: /* perform actual mount */
+
+	mp->mnt_type = "nfs";
+	retval = mount_it_now(mp, vfsflags, (char*)&data);
+	goto ret;
+
+fail:	/* abort */
+
+	if (msock != -1) {
+		if (mclient) {
+			auth_destroy(mclient->cl_auth);
+			clnt_destroy(mclient);
+		}
+		close(msock);
+	}
+	if (fsock != -1)
+		close(fsock);
+
+ret:
+	free(hostname);
+	free(mounthost);
+	free(filteropts);
+	return retval;
+}
+
+#endif /* ENABLE_FEATURE_MOUNT_NFS */