4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/nfs_xdr.h>
52 #include <linux/magic.h>
53 #include <linux/parser.h>
55 #include <asm/system.h>
56 #include <asm/uaccess.h>
60 #include "delegation.h"
64 #define NFSDBG_FACILITY NFSDBG_VFS
67 /* Mount options that take no arguments */
69 Opt_posix, Opt_noposix,
74 Opt_udp, Opt_tcp, Opt_rdma,
76 Opt_rdirplus, Opt_nordirplus,
77 Opt_sharecache, Opt_nosharecache,
79 /* Mount options that take integer arguments */
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
91 /* Mount options that take string arguments */
92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
93 Opt_addr, Opt_mountaddr, Opt_clientaddr,
96 /* Special mount options */
97 Opt_userspace, Opt_deprecated, Opt_sloppy,
102 static const match_table_t nfs_mount_option_tokens = {
103 { Opt_userspace, "bg" },
104 { Opt_userspace, "fg" },
105 { Opt_userspace, "retry=%s" },
107 { Opt_sloppy, "sloppy" },
109 { Opt_soft, "soft" },
110 { Opt_hard, "hard" },
111 { Opt_deprecated, "intr" },
112 { Opt_deprecated, "nointr" },
113 { Opt_posix, "posix" },
114 { Opt_noposix, "noposix" },
116 { Opt_nocto, "nocto" },
118 { Opt_noac, "noac" },
119 { Opt_lock, "lock" },
120 { Opt_nolock, "nolock" },
125 { Opt_rdma, "rdma" },
127 { Opt_noacl, "noacl" },
128 { Opt_rdirplus, "rdirplus" },
129 { Opt_nordirplus, "nordirplus" },
130 { Opt_sharecache, "sharecache" },
131 { Opt_nosharecache, "nosharecache" },
133 { Opt_port, "port=%u" },
134 { Opt_rsize, "rsize=%u" },
135 { Opt_wsize, "wsize=%u" },
136 { Opt_bsize, "bsize=%u" },
137 { Opt_timeo, "timeo=%u" },
138 { Opt_retrans, "retrans=%u" },
139 { Opt_acregmin, "acregmin=%u" },
140 { Opt_acregmax, "acregmax=%u" },
141 { Opt_acdirmin, "acdirmin=%u" },
142 { Opt_acdirmax, "acdirmax=%u" },
143 { Opt_actimeo, "actimeo=%u" },
144 { Opt_namelen, "namlen=%u" },
145 { Opt_mountport, "mountport=%u" },
146 { Opt_mountvers, "mountvers=%u" },
147 { Opt_nfsvers, "nfsvers=%u" },
148 { Opt_nfsvers, "vers=%u" },
150 { Opt_sec, "sec=%s" },
151 { Opt_proto, "proto=%s" },
152 { Opt_mountproto, "mountproto=%s" },
153 { Opt_addr, "addr=%s" },
154 { Opt_clientaddr, "clientaddr=%s" },
155 { Opt_mounthost, "mounthost=%s" },
156 { Opt_mountaddr, "mountaddr=%s" },
158 { Opt_lookupcache, "lookupcache=%s" },
164 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
169 static const match_table_t nfs_xprt_protocol_tokens = {
170 { Opt_xprt_udp, "udp" },
171 { Opt_xprt_tcp, "tcp" },
172 { Opt_xprt_rdma, "rdma" },
174 { Opt_xprt_err, NULL }
178 Opt_sec_none, Opt_sec_sys,
179 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
180 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
181 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
186 static const match_table_t nfs_secflavor_tokens = {
187 { Opt_sec_none, "none" },
188 { Opt_sec_none, "null" },
189 { Opt_sec_sys, "sys" },
191 { Opt_sec_krb5, "krb5" },
192 { Opt_sec_krb5i, "krb5i" },
193 { Opt_sec_krb5p, "krb5p" },
195 { Opt_sec_lkey, "lkey" },
196 { Opt_sec_lkeyi, "lkeyi" },
197 { Opt_sec_lkeyp, "lkeyp" },
199 { Opt_sec_spkm, "spkm3" },
200 { Opt_sec_spkmi, "spkm3i" },
201 { Opt_sec_spkmp, "spkm3p" },
203 { Opt_sec_err, NULL }
207 Opt_lookupcache_all, Opt_lookupcache_positive,
208 Opt_lookupcache_none,
213 static match_table_t nfs_lookupcache_tokens = {
214 { Opt_lookupcache_all, "all" },
215 { Opt_lookupcache_positive, "pos" },
216 { Opt_lookupcache_positive, "positive" },
217 { Opt_lookupcache_none, "none" },
219 { Opt_lookupcache_err, NULL }
223 static void nfs_umount_begin(struct super_block *);
224 static int nfs_statfs(struct dentry *, struct kstatfs *);
225 static int nfs_show_options(struct seq_file *, struct vfsmount *);
226 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
227 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
228 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
229 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
230 static void nfs_kill_super(struct super_block *);
231 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
233 static struct file_system_type nfs_fs_type = {
234 .owner = THIS_MODULE,
236 .get_sb = nfs_get_sb,
237 .kill_sb = nfs_kill_super,
238 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
241 struct file_system_type nfs_xdev_fs_type = {
242 .owner = THIS_MODULE,
244 .get_sb = nfs_xdev_get_sb,
245 .kill_sb = nfs_kill_super,
246 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
249 static const struct super_operations nfs_sops = {
250 .alloc_inode = nfs_alloc_inode,
251 .destroy_inode = nfs_destroy_inode,
252 .write_inode = nfs_write_inode,
253 .statfs = nfs_statfs,
254 .clear_inode = nfs_clear_inode,
255 .umount_begin = nfs_umount_begin,
256 .show_options = nfs_show_options,
257 .show_stats = nfs_show_stats,
258 .remount_fs = nfs_remount,
262 static int nfs4_get_sb(struct file_system_type *fs_type,
263 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
264 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
265 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
266 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
267 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
268 static void nfs4_kill_super(struct super_block *sb);
270 static struct file_system_type nfs4_fs_type = {
271 .owner = THIS_MODULE,
273 .get_sb = nfs4_get_sb,
274 .kill_sb = nfs4_kill_super,
275 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
278 struct file_system_type nfs4_xdev_fs_type = {
279 .owner = THIS_MODULE,
281 .get_sb = nfs4_xdev_get_sb,
282 .kill_sb = nfs4_kill_super,
283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
286 struct file_system_type nfs4_referral_fs_type = {
287 .owner = THIS_MODULE,
289 .get_sb = nfs4_referral_get_sb,
290 .kill_sb = nfs4_kill_super,
291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
294 static const struct super_operations nfs4_sops = {
295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
298 .statfs = nfs_statfs,
299 .clear_inode = nfs4_clear_inode,
300 .umount_begin = nfs_umount_begin,
301 .show_options = nfs_show_options,
302 .show_stats = nfs_show_stats,
303 .remount_fs = nfs_remount,
307 static struct shrinker acl_shrinker = {
308 .shrink = nfs_access_cache_shrinker,
309 .seeks = DEFAULT_SEEKS,
313 * Register the NFS filesystems
315 int __init register_nfs_fs(void)
319 ret = register_filesystem(&nfs_fs_type);
323 ret = nfs_register_sysctl();
327 ret = register_filesystem(&nfs4_fs_type);
331 register_shrinker(&acl_shrinker);
336 nfs_unregister_sysctl();
339 unregister_filesystem(&nfs_fs_type);
345 * Unregister the NFS filesystems
347 void __exit unregister_nfs_fs(void)
349 unregister_shrinker(&acl_shrinker);
351 unregister_filesystem(&nfs4_fs_type);
353 nfs_unregister_sysctl();
354 unregister_filesystem(&nfs_fs_type);
357 void nfs_sb_active(struct super_block *sb)
359 struct nfs_server *server = NFS_SB(sb);
361 if (atomic_inc_return(&server->active) == 1)
362 atomic_inc(&sb->s_active);
365 void nfs_sb_deactive(struct super_block *sb)
367 struct nfs_server *server = NFS_SB(sb);
369 if (atomic_dec_and_test(&server->active))
370 deactivate_super(sb);
374 * Deliver file system statistics to userspace
376 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
378 struct nfs_server *server = NFS_SB(dentry->d_sb);
379 unsigned char blockbits;
380 unsigned long blockres;
381 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
382 struct nfs_fattr fattr;
383 struct nfs_fsstat res = {
388 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
391 buf->f_type = NFS_SUPER_MAGIC;
394 * Current versions of glibc do not correctly handle the
395 * case where f_frsize != f_bsize. Eventually we want to
396 * report the value of wtmult in this field.
398 buf->f_frsize = dentry->d_sb->s_blocksize;
401 * On most *nix systems, f_blocks, f_bfree, and f_bavail
402 * are reported in units of f_frsize. Linux hasn't had
403 * an f_frsize field in its statfs struct until recently,
404 * thus historically Linux's sys_statfs reports these
405 * fields in units of f_bsize.
407 buf->f_bsize = dentry->d_sb->s_blocksize;
408 blockbits = dentry->d_sb->s_blocksize_bits;
409 blockres = (1 << blockbits) - 1;
410 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
411 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
412 buf->f_bavail = (res.abytes + blockres) >> blockbits;
414 buf->f_files = res.tfiles;
415 buf->f_ffree = res.afiles;
417 buf->f_namelen = server->namelen;
422 dprintk("%s: statfs error = %d\n", __func__, -error);
427 * Map the security flavour number to a name
429 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
431 static const struct {
432 rpc_authflavor_t flavour;
435 { RPC_AUTH_NULL, "null" },
436 { RPC_AUTH_UNIX, "sys" },
437 { RPC_AUTH_GSS_KRB5, "krb5" },
438 { RPC_AUTH_GSS_KRB5I, "krb5i" },
439 { RPC_AUTH_GSS_KRB5P, "krb5p" },
440 { RPC_AUTH_GSS_LKEY, "lkey" },
441 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
442 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
443 { RPC_AUTH_GSS_SPKM, "spkm" },
444 { RPC_AUTH_GSS_SPKMI, "spkmi" },
445 { RPC_AUTH_GSS_SPKMP, "spkmp" },
446 { UINT_MAX, "unknown" }
450 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
451 if (sec_flavours[i].flavour == flavour)
454 return sec_flavours[i].str;
457 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
460 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
462 switch (sap->sa_family) {
464 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
465 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
466 NIPQUAD(sin->sin_addr.s_addr));
470 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
471 seq_printf(m, ",mountaddr=" NIP6_FMT,
472 NIP6(sin6->sin6_addr));
477 seq_printf(m, ",mountaddr=unspecified");
480 if (nfss->mountd_version || showdefaults)
481 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
482 if (nfss->mountd_port || showdefaults)
483 seq_printf(m, ",mountport=%u", nfss->mountd_port);
485 switch (nfss->mountd_protocol) {
487 seq_printf(m, ",mountproto=udp");
490 seq_printf(m, ",mountproto=tcp");
494 seq_printf(m, ",mountproto=auto");
499 * Describe the mount options in force on this server representation
501 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
504 static const struct proc_nfs_info {
509 { NFS_MOUNT_SOFT, ",soft", ",hard" },
510 { NFS_MOUNT_INTR, ",intr", ",nointr" },
511 { NFS_MOUNT_POSIX, ",posix", "" },
512 { NFS_MOUNT_NOCTO, ",nocto", "" },
513 { NFS_MOUNT_NOAC, ",noac", "" },
514 { NFS_MOUNT_NONLM, ",nolock", "" },
515 { NFS_MOUNT_NOACL, ",noacl", "" },
516 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
517 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
520 const struct proc_nfs_info *nfs_infop;
521 struct nfs_client *clp = nfss->nfs_client;
522 u32 version = clp->rpc_ops->version;
524 seq_printf(m, ",vers=%u", version);
525 seq_printf(m, ",rsize=%u", nfss->rsize);
526 seq_printf(m, ",wsize=%u", nfss->wsize);
527 if (nfss->bsize != 0)
528 seq_printf(m, ",bsize=%u", nfss->bsize);
529 seq_printf(m, ",namlen=%u", nfss->namelen);
530 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
531 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
532 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
533 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
534 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
535 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
536 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
537 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
538 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
539 if (nfss->flags & nfs_infop->flag)
540 seq_puts(m, nfs_infop->str);
542 seq_puts(m, nfs_infop->nostr);
544 seq_printf(m, ",proto=%s",
545 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
547 if (nfss->port != NFS_PORT)
548 seq_printf(m, ",port=%u", nfss->port);
551 seq_printf(m, ",port=%u", nfss->port);
553 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
554 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
555 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
558 nfs_show_mountd_options(m, nfss, showdefaults);
561 if (clp->rpc_ops->version == 4)
562 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
567 * Describe the mount options on this VFS mountpoint
569 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
571 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
573 nfs_show_mount_options(m, nfss, 0);
575 seq_printf(m, ",addr=%s",
576 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
583 * Present statistical information for this VFS mountpoint
585 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
588 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
589 struct rpc_auth *auth = nfss->client->cl_auth;
590 struct nfs_iostats totals = { };
592 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
595 * Display all mount option settings
597 seq_printf(m, "\n\topts:\t");
598 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
599 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
600 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
601 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
602 nfs_show_mount_options(m, nfss, 1);
604 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
606 seq_printf(m, "\n\tcaps:\t");
607 seq_printf(m, "caps=0x%x", nfss->caps);
608 seq_printf(m, ",wtmult=%u", nfss->wtmult);
609 seq_printf(m, ",dtsize=%u", nfss->dtsize);
610 seq_printf(m, ",bsize=%u", nfss->bsize);
611 seq_printf(m, ",namlen=%u", nfss->namelen);
614 if (nfss->nfs_client->rpc_ops->version == 4) {
615 seq_printf(m, "\n\tnfsv4:\t");
616 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
617 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
618 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
623 * Display security flavor in effect for this mount
625 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
627 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
630 * Display superblock I/O counters
632 for_each_possible_cpu(cpu) {
633 struct nfs_iostats *stats;
636 stats = per_cpu_ptr(nfss->io_stats, cpu);
638 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
639 totals.events[i] += stats->events[i];
640 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
641 totals.bytes[i] += stats->bytes[i];
646 seq_printf(m, "\n\tevents:\t");
647 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
648 seq_printf(m, "%lu ", totals.events[i]);
649 seq_printf(m, "\n\tbytes:\t");
650 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
651 seq_printf(m, "%Lu ", totals.bytes[i]);
654 rpc_print_iostats(m, nfss->client);
660 * Begin unmount by attempting to remove all automounted mountpoints we added
661 * in response to xdev traversals and referrals
663 static void nfs_umount_begin(struct super_block *sb)
665 struct nfs_server *server = NFS_SB(sb);
666 struct rpc_clnt *rpc;
668 /* -EIO all pending I/O */
669 rpc = server->client_acl;
671 rpc_killall_tasks(rpc);
672 rpc = server->client;
674 rpc_killall_tasks(rpc);
678 * Sanity-check a server address provided by the mount command.
680 * Address family must be initialized, and address must not be
681 * the ANY address for that family.
683 static int nfs_verify_server_address(struct sockaddr *addr)
685 switch (addr->sa_family) {
687 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
688 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
691 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
692 return !ipv6_addr_any(sa);
699 static void nfs_parse_ipv4_address(char *string, size_t str_len,
700 struct sockaddr *sap, size_t *addr_len)
702 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
703 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
705 if (str_len <= INET_ADDRSTRLEN) {
706 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
707 (int)str_len, string);
709 sin->sin_family = AF_INET;
710 *addr_len = sizeof(*sin);
711 if (in4_pton(string, str_len, addr, '\0', NULL))
715 sap->sa_family = AF_UNSPEC;
719 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
720 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
722 struct sockaddr_in6 *sin6)
727 if ((string + str_len) == delim)
730 if (*delim != IPV6_SCOPE_DELIMITER)
733 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
736 len = (string + str_len) - delim - 1;
737 p = kstrndup(delim + 1, len, GFP_KERNEL);
739 unsigned long scope_id = 0;
740 struct net_device *dev;
742 dev = dev_get_by_name(&init_net, p);
744 scope_id = dev->ifindex;
747 if (strict_strtoul(p, 10, &scope_id) == 0) {
755 sin6->sin6_scope_id = scope_id;
756 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
763 static void nfs_parse_ipv6_address(char *string, size_t str_len,
764 struct sockaddr *sap, size_t *addr_len)
766 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
767 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
770 if (str_len <= INET6_ADDRSTRLEN) {
771 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
772 (int)str_len, string);
774 sin6->sin6_family = AF_INET6;
775 *addr_len = sizeof(*sin6);
776 if (in6_pton(string, str_len, addr,
777 IPV6_SCOPE_DELIMITER, &delim) != 0) {
778 if (nfs_parse_ipv6_scope_id(string, str_len,
784 sap->sa_family = AF_UNSPEC;
788 static void nfs_parse_ipv6_address(char *string, size_t str_len,
789 struct sockaddr *sap, size_t *addr_len)
791 sap->sa_family = AF_UNSPEC;
797 * Construct a sockaddr based on the contents of a string that contains
798 * an IP address in presentation format.
800 * If there is a problem constructing the new sockaddr, set the address
801 * family to AF_UNSPEC.
803 void nfs_parse_ip_address(char *string, size_t str_len,
804 struct sockaddr *sap, size_t *addr_len)
806 unsigned int i, colons;
809 for (i = 0; i < str_len; i++)
810 if (string[i] == ':')
814 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
816 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
820 * Sanity check the NFS transport protocol.
823 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
825 switch (mnt->nfs_server.protocol) {
826 case XPRT_TRANSPORT_UDP:
827 case XPRT_TRANSPORT_TCP:
828 case XPRT_TRANSPORT_RDMA:
831 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
836 * For text based NFSv2/v3 mounts, the mount protocol transport default
837 * settings should depend upon the specified NFS transport.
839 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
841 nfs_validate_transport_protocol(mnt);
843 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
844 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
846 switch (mnt->nfs_server.protocol) {
847 case XPRT_TRANSPORT_UDP:
848 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
850 case XPRT_TRANSPORT_TCP:
851 case XPRT_TRANSPORT_RDMA:
852 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
857 * Parse the value of the 'sec=' option.
859 * The flavor_len setting is for v4 mounts.
861 static int nfs_parse_security_flavors(char *value,
862 struct nfs_parsed_mount_data *mnt)
864 substring_t args[MAX_OPT_ARGS];
866 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
868 switch (match_token(value, nfs_secflavor_tokens, args)) {
870 mnt->auth_flavor_len = 0;
871 mnt->auth_flavors[0] = RPC_AUTH_NULL;
874 mnt->auth_flavor_len = 0;
875 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
878 mnt->auth_flavor_len = 1;
879 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
882 mnt->auth_flavor_len = 1;
883 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
886 mnt->auth_flavor_len = 1;
887 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
890 mnt->auth_flavor_len = 1;
891 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
894 mnt->auth_flavor_len = 1;
895 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
898 mnt->auth_flavor_len = 1;
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
902 mnt->auth_flavor_len = 1;
903 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
906 mnt->auth_flavor_len = 1;
907 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
910 mnt->auth_flavor_len = 1;
911 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
920 static void nfs_parse_invalid_value(const char *option)
922 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
926 * Error-check and convert a string of mount options from user space into
927 * a data structure. The whole mount string is processed; bad options are
928 * skipped as they are encountered. If there were no errors, return 1;
929 * otherwise return 0 (zero).
931 static int nfs_parse_mount_options(char *raw,
932 struct nfs_parsed_mount_data *mnt)
934 char *p, *string, *secdata;
935 int rc, sloppy = 0, errors = 0;
938 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
941 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
943 secdata = alloc_secdata();
947 rc = security_sb_copy_data(raw, secdata);
949 goto out_security_failure;
951 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
953 goto out_security_failure;
955 free_secdata(secdata);
957 while ((p = strsep(&raw, ",")) != NULL) {
958 substring_t args[MAX_OPT_ARGS];
964 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
966 token = match_token(p, nfs_mount_option_tokens, args);
970 * boolean options: foo/nofoo
973 mnt->flags |= NFS_MOUNT_SOFT;
976 mnt->flags &= ~NFS_MOUNT_SOFT;
979 mnt->flags |= NFS_MOUNT_POSIX;
982 mnt->flags &= ~NFS_MOUNT_POSIX;
985 mnt->flags &= ~NFS_MOUNT_NOCTO;
988 mnt->flags |= NFS_MOUNT_NOCTO;
991 mnt->flags &= ~NFS_MOUNT_NOAC;
994 mnt->flags |= NFS_MOUNT_NOAC;
997 mnt->flags &= ~NFS_MOUNT_NONLM;
1000 mnt->flags |= NFS_MOUNT_NONLM;
1003 mnt->flags &= ~NFS_MOUNT_VER3;
1006 mnt->flags |= NFS_MOUNT_VER3;
1009 mnt->flags &= ~NFS_MOUNT_TCP;
1010 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1013 mnt->flags |= NFS_MOUNT_TCP;
1014 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1017 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1018 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1021 mnt->flags &= ~NFS_MOUNT_NOACL;
1024 mnt->flags |= NFS_MOUNT_NOACL;
1027 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1029 case Opt_nordirplus:
1030 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1032 case Opt_sharecache:
1033 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1035 case Opt_nosharecache:
1036 mnt->flags |= NFS_MOUNT_UNSHARED;
1040 * options that take numeric values
1043 if (match_int(args, &option) ||
1044 option < 0 || option > USHORT_MAX) {
1046 nfs_parse_invalid_value("port");
1048 mnt->nfs_server.port = option;
1051 if (match_int(args, &option) || option < 0) {
1053 nfs_parse_invalid_value("rsize");
1055 mnt->rsize = option;
1058 if (match_int(args, &option) || option < 0) {
1060 nfs_parse_invalid_value("wsize");
1062 mnt->wsize = option;
1065 if (match_int(args, &option) || option < 0) {
1067 nfs_parse_invalid_value("bsize");
1069 mnt->bsize = option;
1072 if (match_int(args, &option) || option <= 0) {
1074 nfs_parse_invalid_value("timeo");
1076 mnt->timeo = option;
1079 if (match_int(args, &option) || option <= 0) {
1081 nfs_parse_invalid_value("retrans");
1083 mnt->retrans = option;
1086 if (match_int(args, &option) || option < 0) {
1088 nfs_parse_invalid_value("acregmin");
1090 mnt->acregmin = option;
1093 if (match_int(args, &option) || option < 0) {
1095 nfs_parse_invalid_value("acregmax");
1097 mnt->acregmax = option;
1100 if (match_int(args, &option) || option < 0) {
1102 nfs_parse_invalid_value("acdirmin");
1104 mnt->acdirmin = option;
1107 if (match_int(args, &option) || option < 0) {
1109 nfs_parse_invalid_value("acdirmax");
1111 mnt->acdirmax = option;
1114 if (match_int(args, &option) || option < 0) {
1116 nfs_parse_invalid_value("actimeo");
1118 mnt->acregmin = mnt->acregmax =
1119 mnt->acdirmin = mnt->acdirmax = option;
1122 if (match_int(args, &option) || option < 0) {
1124 nfs_parse_invalid_value("namlen");
1126 mnt->namlen = option;
1129 if (match_int(args, &option) ||
1130 option < 0 || option > USHORT_MAX) {
1132 nfs_parse_invalid_value("mountport");
1134 mnt->mount_server.port = option;
1137 if (match_int(args, &option) ||
1138 option < NFS_MNT_VERSION ||
1139 option > NFS_MNT3_VERSION) {
1141 nfs_parse_invalid_value("mountvers");
1143 mnt->mount_server.version = option;
1146 if (match_int(args, &option)) {
1148 nfs_parse_invalid_value("nfsvers");
1153 mnt->flags &= ~NFS_MOUNT_VER3;
1156 mnt->flags |= NFS_MOUNT_VER3;
1160 nfs_parse_invalid_value("nfsvers");
1165 * options that take text values
1168 string = match_strdup(args);
1171 rc = nfs_parse_security_flavors(string, mnt);
1175 dfprintk(MOUNT, "NFS: unrecognized "
1176 "security flavor\n");
1180 string = match_strdup(args);
1183 token = match_token(string,
1184 nfs_xprt_protocol_tokens, args);
1189 mnt->flags &= ~NFS_MOUNT_TCP;
1190 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1193 mnt->flags |= NFS_MOUNT_TCP;
1194 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1197 /* vector side protocols to TCP */
1198 mnt->flags |= NFS_MOUNT_TCP;
1199 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1203 dfprintk(MOUNT, "NFS: unrecognized "
1204 "transport protocol\n");
1207 case Opt_mountproto:
1208 string = match_strdup(args);
1211 token = match_token(string,
1212 nfs_xprt_protocol_tokens, args);
1217 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1220 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1222 case Opt_xprt_rdma: /* not used for side protocols */
1225 dfprintk(MOUNT, "NFS: unrecognized "
1226 "transport protocol\n");
1230 string = match_strdup(args);
1233 nfs_parse_ip_address(string, strlen(string),
1235 &mnt->nfs_server.address,
1236 &mnt->nfs_server.addrlen);
1239 case Opt_clientaddr:
1240 string = match_strdup(args);
1243 kfree(mnt->client_address);
1244 mnt->client_address = string;
1247 string = match_strdup(args);
1250 kfree(mnt->mount_server.hostname);
1251 mnt->mount_server.hostname = string;
1254 string = match_strdup(args);
1257 nfs_parse_ip_address(string, strlen(string),
1259 &mnt->mount_server.address,
1260 &mnt->mount_server.addrlen);
1263 case Opt_lookupcache:
1264 string = match_strdup(args);
1267 token = match_token(string,
1268 nfs_lookupcache_tokens, args);
1271 case Opt_lookupcache_all:
1272 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1274 case Opt_lookupcache_positive:
1275 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1276 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1278 case Opt_lookupcache_none:
1279 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1283 dfprintk(MOUNT, "NFS: invalid "
1284 "lookupcache argument\n");
1293 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1296 case Opt_deprecated:
1297 dfprintk(MOUNT, "NFS: ignoring mount option "
1303 dfprintk(MOUNT, "NFS: unrecognized mount option "
1309 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1310 errors, (errors == 1 ? "" : "s"));
1317 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1319 out_security_failure:
1320 free_secdata(secdata);
1321 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1326 * Use the remote server's MOUNT service to request the NFS file handle
1327 * corresponding to the provided path.
1329 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1330 struct nfs_fh *root_fh)
1332 struct nfs_mount_request request = {
1333 .sap = (struct sockaddr *)
1334 &args->mount_server.address,
1335 .dirpath = args->nfs_server.export_path,
1336 .protocol = args->mount_server.protocol,
1341 if (args->mount_server.version == 0) {
1342 if (args->flags & NFS_MOUNT_VER3)
1343 args->mount_server.version = NFS_MNT3_VERSION;
1345 args->mount_server.version = NFS_MNT_VERSION;
1347 request.version = args->mount_server.version;
1349 if (args->mount_server.hostname)
1350 request.hostname = args->mount_server.hostname;
1352 request.hostname = args->nfs_server.hostname;
1355 * Construct the mount server's address.
1357 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1358 memcpy(request.sap, &args->nfs_server.address,
1359 args->nfs_server.addrlen);
1360 args->mount_server.addrlen = args->nfs_server.addrlen;
1362 request.salen = args->mount_server.addrlen;
1365 * autobind will be used if mount_server.port == 0
1367 nfs_set_port(request.sap, args->mount_server.port);
1370 * Now ask the mount server to map our export path
1373 status = nfs_mount(&request);
1377 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1378 request.hostname, status);
1382 static int nfs_parse_simple_hostname(const char *dev_name,
1383 char **hostname, size_t maxnamlen,
1384 char **export_path, size_t maxpathlen)
1387 char *colon, *comma;
1389 colon = strchr(dev_name, ':');
1391 goto out_bad_devname;
1393 len = colon - dev_name;
1394 if (len > maxnamlen)
1397 /* N.B. caller will free nfs_server.hostname in all cases */
1398 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1402 /* kill possible hostname list: not supported */
1403 comma = strchr(*hostname, ',');
1404 if (comma != NULL) {
1405 if (comma == *hostname)
1406 goto out_bad_devname;
1411 len = strlen(colon);
1412 if (len > maxpathlen)
1414 *export_path = kstrndup(colon, len, GFP_KERNEL);
1418 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1422 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1426 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1430 dfprintk(MOUNT, "NFS: server hostname too long\n");
1431 return -ENAMETOOLONG;
1434 dfprintk(MOUNT, "NFS: export pathname too long\n");
1435 return -ENAMETOOLONG;
1439 * Hostname has square brackets around it because it contains one or
1440 * more colons. We look for the first closing square bracket, and a
1441 * colon must follow it.
1443 static int nfs_parse_protected_hostname(const char *dev_name,
1444 char **hostname, size_t maxnamlen,
1445 char **export_path, size_t maxpathlen)
1450 start = (char *)(dev_name + 1);
1452 end = strchr(start, ']');
1454 goto out_bad_devname;
1455 if (*(end + 1) != ':')
1456 goto out_bad_devname;
1459 if (len > maxnamlen)
1462 /* N.B. caller will free nfs_server.hostname in all cases */
1463 *hostname = kstrndup(start, len, GFP_KERNEL);
1464 if (*hostname == NULL)
1469 if (len > maxpathlen)
1471 *export_path = kstrndup(end, len, GFP_KERNEL);
1478 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1482 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1486 dfprintk(MOUNT, "NFS: server hostname too long\n");
1487 return -ENAMETOOLONG;
1490 dfprintk(MOUNT, "NFS: export pathname too long\n");
1491 return -ENAMETOOLONG;
1495 * Split "dev_name" into "hostname:export_path".
1497 * The leftmost colon demarks the split between the server's hostname
1498 * and the export path. If the hostname starts with a left square
1499 * bracket, then it may contain colons.
1501 * Note: caller frees hostname and export path, even on error.
1503 static int nfs_parse_devname(const char *dev_name,
1504 char **hostname, size_t maxnamlen,
1505 char **export_path, size_t maxpathlen)
1507 if (*dev_name == '[')
1508 return nfs_parse_protected_hostname(dev_name,
1509 hostname, maxnamlen,
1510 export_path, maxpathlen);
1512 return nfs_parse_simple_hostname(dev_name,
1513 hostname, maxnamlen,
1514 export_path, maxpathlen);
1518 * Validate the NFS2/NFS3 mount data
1519 * - fills in the mount root filehandle
1521 * For option strings, user space handles the following behaviors:
1523 * + DNS: mapping server host name to IP address ("addr=" option)
1525 * + failure mode: how to behave if a mount request can't be handled
1526 * immediately ("fg/bg" option)
1528 * + retry: how often to retry a mount request ("retry=" option)
1530 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1531 * mountproto=tcp after mountproto=udp, and so on
1533 static int nfs_validate_mount_data(void *options,
1534 struct nfs_parsed_mount_data *args,
1535 struct nfs_fh *mntfh,
1536 const char *dev_name)
1538 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1543 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1544 args->rsize = NFS_MAX_FILE_IO_SIZE;
1545 args->wsize = NFS_MAX_FILE_IO_SIZE;
1546 args->acregmin = NFS_DEF_ACREGMIN;
1547 args->acregmax = NFS_DEF_ACREGMAX;
1548 args->acdirmin = NFS_DEF_ACDIRMIN;
1549 args->acdirmax = NFS_DEF_ACDIRMAX;
1550 args->mount_server.port = 0; /* autobind unless user sets port */
1551 args->nfs_server.port = 0; /* autobind unless user sets port */
1552 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1553 args->auth_flavors[0] = RPC_AUTH_UNIX;
1555 switch (data->version) {
1561 if (data->flags & NFS_MOUNT_VER3)
1563 data->root.size = NFS2_FHSIZE;
1564 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1566 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1569 memset(data->context, 0, sizeof(data->context));
1571 if (data->flags & NFS_MOUNT_VER3) {
1572 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1573 goto out_invalid_fh;
1574 mntfh->size = data->root.size;
1576 mntfh->size = NFS2_FHSIZE;
1579 memcpy(mntfh->data, data->root.data, mntfh->size);
1580 if (mntfh->size < sizeof(mntfh->data))
1581 memset(mntfh->data + mntfh->size, 0,
1582 sizeof(mntfh->data) - mntfh->size);
1585 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1588 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1589 args->rsize = data->rsize;
1590 args->wsize = data->wsize;
1591 args->timeo = data->timeo;
1592 args->retrans = data->retrans;
1593 args->acregmin = data->acregmin;
1594 args->acregmax = data->acregmax;
1595 args->acdirmin = data->acdirmin;
1596 args->acdirmax = data->acdirmax;
1598 memcpy(&args->nfs_server.address, &data->addr,
1599 sizeof(data->addr));
1600 args->nfs_server.addrlen = sizeof(data->addr);
1601 if (!nfs_verify_server_address((struct sockaddr *)
1602 &args->nfs_server.address))
1603 goto out_no_address;
1605 if (!(data->flags & NFS_MOUNT_TCP))
1606 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1607 /* N.B. caller will free nfs_server.hostname in all cases */
1608 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1609 args->namlen = data->namlen;
1610 args->bsize = data->bsize;
1612 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1613 args->auth_flavors[0] = data->pseudoflavor;
1614 if (!args->nfs_server.hostname)
1618 * The legacy version 6 binary mount data from userspace has a
1619 * field used only to transport selinux information into the
1620 * the kernel. To continue to support that functionality we
1621 * have a touch of selinux knowledge here in the NFS code. The
1622 * userspace code converted context=blah to just blah so we are
1623 * converting back to the full string selinux understands.
1625 if (data->context[0]){
1626 #ifdef CONFIG_SECURITY_SELINUX
1628 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1631 strcpy(opts_str, "context=");
1632 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1633 strcat(opts_str, &data->context[0]);
1634 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1647 if (nfs_parse_mount_options((char *)options, args) == 0)
1650 if (!nfs_verify_server_address((struct sockaddr *)
1651 &args->nfs_server.address))
1652 goto out_no_address;
1654 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1655 args->nfs_server.port);
1657 nfs_set_mount_transport_protocol(args);
1659 status = nfs_parse_devname(dev_name,
1660 &args->nfs_server.hostname,
1662 &args->nfs_server.export_path,
1665 status = nfs_try_mount(args, mntfh);
1667 kfree(args->nfs_server.export_path);
1668 args->nfs_server.export_path = NULL;
1677 #ifndef CONFIG_NFS_V3
1678 if (args->flags & NFS_MOUNT_VER3)
1679 goto out_v3_not_compiled;
1680 #endif /* !CONFIG_NFS_V3 */
1685 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1689 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1694 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1697 #ifndef CONFIG_NFS_V3
1698 out_v3_not_compiled:
1699 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1700 return -EPROTONOSUPPORT;
1701 #endif /* !CONFIG_NFS_V3 */
1704 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1708 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1712 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1717 nfs_compare_remount_data(struct nfs_server *nfss,
1718 struct nfs_parsed_mount_data *data)
1720 if (data->flags != nfss->flags ||
1721 data->rsize != nfss->rsize ||
1722 data->wsize != nfss->wsize ||
1723 data->retrans != nfss->client->cl_timeout->to_retries ||
1724 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1725 data->acregmin != nfss->acregmin / HZ ||
1726 data->acregmax != nfss->acregmax / HZ ||
1727 data->acdirmin != nfss->acdirmin / HZ ||
1728 data->acdirmax != nfss->acdirmax / HZ ||
1729 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1730 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1731 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1732 data->nfs_server.addrlen) != 0)
1739 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1742 struct nfs_server *nfss = sb->s_fs_info;
1743 struct nfs_parsed_mount_data *data;
1744 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1745 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1746 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1749 * Userspace mount programs that send binary options generally send
1750 * them populated with default values. We have no way to know which
1751 * ones were explicitly specified. Fall back to legacy behavior and
1752 * just return success.
1754 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1755 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1756 options->version <= 6))))
1759 data = kzalloc(sizeof(*data), GFP_KERNEL);
1763 /* fill out struct with values from existing mount */
1764 data->flags = nfss->flags;
1765 data->rsize = nfss->rsize;
1766 data->wsize = nfss->wsize;
1767 data->retrans = nfss->client->cl_timeout->to_retries;
1768 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1769 data->acregmin = nfss->acregmin / HZ;
1770 data->acregmax = nfss->acregmax / HZ;
1771 data->acdirmin = nfss->acdirmin / HZ;
1772 data->acdirmax = nfss->acdirmax / HZ;
1773 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1774 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1775 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1776 data->nfs_server.addrlen);
1778 /* overwrite those values with any that were specified */
1779 error = nfs_parse_mount_options((char *)options, data);
1783 /* compare new mount options with old ones */
1784 error = nfs_compare_remount_data(nfss, data);
1791 * Initialise the common bits of the superblock
1793 static inline void nfs_initialise_sb(struct super_block *sb)
1795 struct nfs_server *server = NFS_SB(sb);
1797 sb->s_magic = NFS_SUPER_MAGIC;
1799 /* We probably want something more informative here */
1800 snprintf(sb->s_id, sizeof(sb->s_id),
1801 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1803 if (sb->s_blocksize == 0)
1804 sb->s_blocksize = nfs_block_bits(server->wsize,
1805 &sb->s_blocksize_bits);
1807 if (server->flags & NFS_MOUNT_NOAC)
1808 sb->s_flags |= MS_SYNCHRONOUS;
1810 nfs_super_set_maxbytes(sb, server->maxfilesize);
1814 * Finish setting up an NFS2/3 superblock
1816 static void nfs_fill_super(struct super_block *sb,
1817 struct nfs_parsed_mount_data *data)
1819 struct nfs_server *server = NFS_SB(sb);
1821 sb->s_blocksize_bits = 0;
1822 sb->s_blocksize = 0;
1824 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1826 if (server->flags & NFS_MOUNT_VER3) {
1827 /* The VFS shouldn't apply the umask to mode bits. We will do
1828 * so ourselves when necessary.
1830 sb->s_flags |= MS_POSIXACL;
1831 sb->s_time_gran = 1;
1834 sb->s_op = &nfs_sops;
1835 nfs_initialise_sb(sb);
1839 * Finish setting up a cloned NFS2/3 superblock
1841 static void nfs_clone_super(struct super_block *sb,
1842 const struct super_block *old_sb)
1844 struct nfs_server *server = NFS_SB(sb);
1846 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1847 sb->s_blocksize = old_sb->s_blocksize;
1848 sb->s_maxbytes = old_sb->s_maxbytes;
1850 if (server->flags & NFS_MOUNT_VER3) {
1851 /* The VFS shouldn't apply the umask to mode bits. We will do
1852 * so ourselves when necessary.
1854 sb->s_flags |= MS_POSIXACL;
1855 sb->s_time_gran = 1;
1858 sb->s_op = old_sb->s_op;
1859 nfs_initialise_sb(sb);
1862 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1864 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1866 const struct nfs_server *a = s->s_fs_info;
1867 const struct rpc_clnt *clnt_a = a->client;
1868 const struct rpc_clnt *clnt_b = b->client;
1870 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1872 if (a->nfs_client != b->nfs_client)
1874 if (a->flags != b->flags)
1876 if (a->wsize != b->wsize)
1878 if (a->rsize != b->rsize)
1880 if (a->acregmin != b->acregmin)
1882 if (a->acregmax != b->acregmax)
1884 if (a->acdirmin != b->acdirmin)
1886 if (a->acdirmax != b->acdirmax)
1888 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1895 struct nfs_sb_mountdata {
1896 struct nfs_server *server;
1900 static int nfs_set_super(struct super_block *s, void *data)
1902 struct nfs_sb_mountdata *sb_mntdata = data;
1903 struct nfs_server *server = sb_mntdata->server;
1906 s->s_flags = sb_mntdata->mntflags;
1907 s->s_fs_info = server;
1908 ret = set_anon_super(s, server);
1910 server->s_dev = s->s_dev;
1914 static int nfs_compare_super_address(struct nfs_server *server1,
1915 struct nfs_server *server2)
1917 struct sockaddr *sap1, *sap2;
1919 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1920 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1922 if (sap1->sa_family != sap2->sa_family)
1925 switch (sap1->sa_family) {
1927 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1928 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1929 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1931 if (sin1->sin_port != sin2->sin_port)
1936 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1937 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1938 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1940 if (sin1->sin6_port != sin2->sin6_port)
1951 static int nfs_compare_super(struct super_block *sb, void *data)
1953 struct nfs_sb_mountdata *sb_mntdata = data;
1954 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1955 int mntflags = sb_mntdata->mntflags;
1957 if (!nfs_compare_super_address(old, server))
1959 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1960 if (old->flags & NFS_MOUNT_UNSHARED)
1962 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1964 return nfs_compare_mount_options(sb, server, mntflags);
1967 static int nfs_bdi_register(struct nfs_server *server)
1969 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1972 static int nfs_get_sb(struct file_system_type *fs_type,
1973 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1975 struct nfs_server *server = NULL;
1976 struct super_block *s;
1977 struct nfs_parsed_mount_data *data;
1978 struct nfs_fh *mntfh;
1979 struct dentry *mntroot;
1980 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1981 struct nfs_sb_mountdata sb_mntdata = {
1984 int error = -ENOMEM;
1986 data = kzalloc(sizeof(*data), GFP_KERNEL);
1987 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1988 if (data == NULL || mntfh == NULL)
1991 security_init_mnt_opts(&data->lsm_opts);
1993 /* Validate the mount data */
1994 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1998 /* Get a volume representation */
1999 server = nfs_create_server(data, mntfh);
2000 if (IS_ERR(server)) {
2001 error = PTR_ERR(server);
2004 sb_mntdata.server = server;
2006 if (server->flags & NFS_MOUNT_UNSHARED)
2007 compare_super = NULL;
2009 /* Get a superblock - note that we may end up sharing one that already exists */
2010 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2016 if (s->s_fs_info != server) {
2017 nfs_free_server(server);
2020 error = nfs_bdi_register(server);
2022 goto error_splat_super;
2026 /* initial superblock/root creation */
2027 nfs_fill_super(s, data);
2030 mntroot = nfs_get_root(s, mntfh);
2031 if (IS_ERR(mntroot)) {
2032 error = PTR_ERR(mntroot);
2033 goto error_splat_super;
2036 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2038 goto error_splat_root;
2040 s->s_flags |= MS_ACTIVE;
2042 mnt->mnt_root = mntroot;
2046 kfree(data->nfs_server.hostname);
2047 kfree(data->mount_server.hostname);
2048 security_free_mnt_opts(&data->lsm_opts);
2055 nfs_free_server(server);
2061 up_write(&s->s_umount);
2062 deactivate_super(s);
2067 * Destroy an NFS2/3 superblock
2069 static void nfs_kill_super(struct super_block *s)
2071 struct nfs_server *server = NFS_SB(s);
2073 bdi_unregister(&server->backing_dev_info);
2075 nfs_free_server(server);
2079 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2081 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2082 const char *dev_name, void *raw_data,
2083 struct vfsmount *mnt)
2085 struct nfs_clone_mount *data = raw_data;
2086 struct super_block *s;
2087 struct nfs_server *server;
2088 struct dentry *mntroot;
2089 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2090 struct nfs_sb_mountdata sb_mntdata = {
2095 dprintk("--> nfs_xdev_get_sb()\n");
2097 /* create a new volume representation */
2098 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2099 if (IS_ERR(server)) {
2100 error = PTR_ERR(server);
2101 goto out_err_noserver;
2103 sb_mntdata.server = server;
2105 if (server->flags & NFS_MOUNT_UNSHARED)
2106 compare_super = NULL;
2108 /* Get a superblock - note that we may end up sharing one that already exists */
2109 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2115 if (s->s_fs_info != server) {
2116 nfs_free_server(server);
2119 error = nfs_bdi_register(server);
2121 goto error_splat_super;
2125 /* initial superblock/root creation */
2126 nfs_clone_super(s, data->sb);
2129 mntroot = nfs_get_root(s, data->fh);
2130 if (IS_ERR(mntroot)) {
2131 error = PTR_ERR(mntroot);
2132 goto error_splat_super;
2134 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2137 goto error_splat_super;
2140 s->s_flags |= MS_ACTIVE;
2142 mnt->mnt_root = mntroot;
2144 /* clone any lsm security options from the parent to the new sb */
2145 security_sb_clone_mnt_opts(data->sb, s);
2147 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2151 nfs_free_server(server);
2153 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2157 up_write(&s->s_umount);
2158 deactivate_super(s);
2159 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2163 #ifdef CONFIG_NFS_V4
2166 * Finish setting up a cloned NFS4 superblock
2168 static void nfs4_clone_super(struct super_block *sb,
2169 const struct super_block *old_sb)
2171 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2172 sb->s_blocksize = old_sb->s_blocksize;
2173 sb->s_maxbytes = old_sb->s_maxbytes;
2174 sb->s_time_gran = 1;
2175 sb->s_op = old_sb->s_op;
2176 nfs_initialise_sb(sb);
2180 * Set up an NFS4 superblock
2182 static void nfs4_fill_super(struct super_block *sb)
2184 sb->s_time_gran = 1;
2185 sb->s_op = &nfs4_sops;
2186 nfs_initialise_sb(sb);
2190 * Validate NFSv4 mount options
2192 static int nfs4_validate_mount_data(void *options,
2193 struct nfs_parsed_mount_data *args,
2194 const char *dev_name)
2196 struct sockaddr_in *ap;
2197 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2203 args->rsize = NFS_MAX_FILE_IO_SIZE;
2204 args->wsize = NFS_MAX_FILE_IO_SIZE;
2205 args->acregmin = NFS_DEF_ACREGMIN;
2206 args->acregmax = NFS_DEF_ACREGMAX;
2207 args->acdirmin = NFS_DEF_ACDIRMIN;
2208 args->acdirmax = NFS_DEF_ACDIRMAX;
2209 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2210 args->auth_flavors[0] = RPC_AUTH_UNIX;
2211 args->auth_flavor_len = 0;
2213 switch (data->version) {
2215 ap = (struct sockaddr_in *)&args->nfs_server.address;
2216 if (data->host_addrlen > sizeof(args->nfs_server.address))
2217 goto out_no_address;
2218 if (data->host_addrlen == 0)
2219 goto out_no_address;
2220 args->nfs_server.addrlen = data->host_addrlen;
2221 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2223 if (!nfs_verify_server_address((struct sockaddr *)
2224 &args->nfs_server.address))
2225 goto out_no_address;
2227 if (data->auth_flavourlen) {
2228 if (data->auth_flavourlen > 1)
2229 goto out_inval_auth;
2230 if (copy_from_user(&args->auth_flavors[0],
2231 data->auth_flavours,
2232 sizeof(args->auth_flavors[0])))
2236 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2239 args->nfs_server.hostname = c;
2241 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2244 args->nfs_server.export_path = c;
2245 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2247 c = strndup_user(data->client_addr.data, 16);
2250 args->client_address = c;
2253 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2257 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2258 args->rsize = data->rsize;
2259 args->wsize = data->wsize;
2260 args->timeo = data->timeo;
2261 args->retrans = data->retrans;
2262 args->acregmin = data->acregmin;
2263 args->acregmax = data->acregmax;
2264 args->acdirmin = data->acdirmin;
2265 args->acdirmax = data->acdirmax;
2266 args->nfs_server.protocol = data->proto;
2267 nfs_validate_transport_protocol(args);
2273 if (nfs_parse_mount_options((char *)options, args) == 0)
2276 if (!nfs_verify_server_address((struct sockaddr *)
2277 &args->nfs_server.address))
2280 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2281 args->nfs_server.port);
2283 nfs_validate_transport_protocol(args);
2285 if (args->auth_flavor_len > 1)
2286 goto out_inval_auth;
2288 if (args->client_address == NULL)
2289 goto out_no_client_address;
2291 status = nfs_parse_devname(dev_name,
2292 &args->nfs_server.hostname,
2294 &args->nfs_server.export_path,
2306 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2310 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2311 data->auth_flavourlen);
2315 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2318 out_no_client_address:
2319 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2324 * Get the superblock for an NFS4 mountpoint
2326 static int nfs4_get_sb(struct file_system_type *fs_type,
2327 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2329 struct nfs_parsed_mount_data *data;
2330 struct super_block *s;
2331 struct nfs_server *server;
2332 struct nfs_fh *mntfh;
2333 struct dentry *mntroot;
2334 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2335 struct nfs_sb_mountdata sb_mntdata = {
2338 int error = -ENOMEM;
2340 data = kzalloc(sizeof(*data), GFP_KERNEL);
2341 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2342 if (data == NULL || mntfh == NULL)
2345 security_init_mnt_opts(&data->lsm_opts);
2347 /* Validate the mount data */
2348 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2352 /* Get a volume representation */
2353 server = nfs4_create_server(data, mntfh);
2354 if (IS_ERR(server)) {
2355 error = PTR_ERR(server);
2358 sb_mntdata.server = server;
2360 if (server->flags & NFS4_MOUNT_UNSHARED)
2361 compare_super = NULL;
2363 /* Get a superblock - note that we may end up sharing one that already exists */
2364 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2370 if (s->s_fs_info != server) {
2371 nfs_free_server(server);
2374 error = nfs_bdi_register(server);
2376 goto error_splat_super;
2380 /* initial superblock/root creation */
2384 mntroot = nfs4_get_root(s, mntfh);
2385 if (IS_ERR(mntroot)) {
2386 error = PTR_ERR(mntroot);
2387 goto error_splat_super;
2390 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2392 goto error_splat_root;
2394 s->s_flags |= MS_ACTIVE;
2396 mnt->mnt_root = mntroot;
2400 kfree(data->client_address);
2401 kfree(data->nfs_server.export_path);
2402 kfree(data->nfs_server.hostname);
2403 security_free_mnt_opts(&data->lsm_opts);
2410 nfs_free_server(server);
2416 up_write(&s->s_umount);
2417 deactivate_super(s);
2421 static void nfs4_kill_super(struct super_block *sb)
2423 struct nfs_server *server = NFS_SB(sb);
2425 nfs_return_all_delegations(sb);
2426 kill_anon_super(sb);
2428 nfs4_renewd_prepare_shutdown(server);
2429 nfs_free_server(server);
2433 * Clone an NFS4 server record on xdev traversal (FSID-change)
2435 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2436 const char *dev_name, void *raw_data,
2437 struct vfsmount *mnt)
2439 struct nfs_clone_mount *data = raw_data;
2440 struct super_block *s;
2441 struct nfs_server *server;
2442 struct dentry *mntroot;
2443 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2444 struct nfs_sb_mountdata sb_mntdata = {
2449 dprintk("--> nfs4_xdev_get_sb()\n");
2451 /* create a new volume representation */
2452 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2453 if (IS_ERR(server)) {
2454 error = PTR_ERR(server);
2455 goto out_err_noserver;
2457 sb_mntdata.server = server;
2459 if (server->flags & NFS4_MOUNT_UNSHARED)
2460 compare_super = NULL;
2462 /* Get a superblock - note that we may end up sharing one that already exists */
2463 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2469 if (s->s_fs_info != server) {
2470 nfs_free_server(server);
2473 error = nfs_bdi_register(server);
2475 goto error_splat_super;
2479 /* initial superblock/root creation */
2480 nfs4_clone_super(s, data->sb);
2483 mntroot = nfs4_get_root(s, data->fh);
2484 if (IS_ERR(mntroot)) {
2485 error = PTR_ERR(mntroot);
2486 goto error_splat_super;
2488 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2491 goto error_splat_super;
2494 s->s_flags |= MS_ACTIVE;
2496 mnt->mnt_root = mntroot;
2498 security_sb_clone_mnt_opts(data->sb, s);
2500 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2504 nfs_free_server(server);
2506 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2510 up_write(&s->s_umount);
2511 deactivate_super(s);
2512 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2517 * Create an NFS4 server record on referral traversal
2519 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2520 const char *dev_name, void *raw_data,
2521 struct vfsmount *mnt)
2523 struct nfs_clone_mount *data = raw_data;
2524 struct super_block *s;
2525 struct nfs_server *server;
2526 struct dentry *mntroot;
2527 struct nfs_fh mntfh;
2528 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2529 struct nfs_sb_mountdata sb_mntdata = {
2534 dprintk("--> nfs4_referral_get_sb()\n");
2536 /* create a new volume representation */
2537 server = nfs4_create_referral_server(data, &mntfh);
2538 if (IS_ERR(server)) {
2539 error = PTR_ERR(server);
2540 goto out_err_noserver;
2542 sb_mntdata.server = server;
2544 if (server->flags & NFS4_MOUNT_UNSHARED)
2545 compare_super = NULL;
2547 /* Get a superblock - note that we may end up sharing one that already exists */
2548 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2554 if (s->s_fs_info != server) {
2555 nfs_free_server(server);
2558 error = nfs_bdi_register(server);
2560 goto error_splat_super;
2564 /* initial superblock/root creation */
2568 mntroot = nfs4_get_root(s, &mntfh);
2569 if (IS_ERR(mntroot)) {
2570 error = PTR_ERR(mntroot);
2571 goto error_splat_super;
2573 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2576 goto error_splat_super;
2579 s->s_flags |= MS_ACTIVE;
2581 mnt->mnt_root = mntroot;
2583 security_sb_clone_mnt_opts(data->sb, s);
2585 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2589 nfs_free_server(server);
2591 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2595 up_write(&s->s_umount);
2596 deactivate_super(s);
2597 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2601 #endif /* CONFIG_NFS_V4 */