4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, 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 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 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 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 * Set the port number in an address. Be agnostic about the address family.
680 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
682 switch (sap->sa_family) {
684 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
685 ap->sin_port = htons(port);
689 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
690 ap->sin6_port = htons(port);
697 * Sanity-check a server address provided by the mount command.
699 * Address family must be initialized, and address must not be
700 * the ANY address for that family.
702 static int nfs_verify_server_address(struct sockaddr *addr)
704 switch (addr->sa_family) {
706 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
707 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
710 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
711 return !ipv6_addr_any(sa);
718 static void nfs_parse_ipv4_address(char *string, size_t str_len,
719 struct sockaddr *sap, size_t *addr_len)
721 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
722 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
724 if (str_len <= INET_ADDRSTRLEN) {
725 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
726 (int)str_len, string);
728 sin->sin_family = AF_INET;
729 *addr_len = sizeof(*sin);
730 if (in4_pton(string, str_len, addr, '\0', NULL))
734 sap->sa_family = AF_UNSPEC;
738 #define IPV6_SCOPE_DELIMITER '%'
740 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
741 static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
743 struct sockaddr_in6 *sin6)
748 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
750 if (*delim != IPV6_SCOPE_DELIMITER)
753 len = (string + str_len) - delim - 1;
754 p = kstrndup(delim + 1, len, GFP_KERNEL);
756 unsigned long scope_id = 0;
757 struct net_device *dev;
759 dev = dev_get_by_name(&init_net, p);
761 scope_id = dev->ifindex;
764 /* scope_id is set to zero on error */
765 strict_strtoul(p, 10, &scope_id);
769 sin6->sin6_scope_id = scope_id;
770 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
774 static void nfs_parse_ipv6_address(char *string, size_t str_len,
775 struct sockaddr *sap, size_t *addr_len)
777 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
778 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
781 if (str_len <= INET6_ADDRSTRLEN) {
782 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
783 (int)str_len, string);
785 sin6->sin6_family = AF_INET6;
786 *addr_len = sizeof(*sin6);
787 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
788 nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
793 sap->sa_family = AF_UNSPEC;
797 static void nfs_parse_ipv6_address(char *string, size_t str_len,
798 struct sockaddr *sap, size_t *addr_len)
800 sap->sa_family = AF_UNSPEC;
806 * Construct a sockaddr based on the contents of a string that contains
807 * an IP address in presentation format.
809 * If there is a problem constructing the new sockaddr, set the address
810 * family to AF_UNSPEC.
812 static void nfs_parse_ip_address(char *string, size_t str_len,
813 struct sockaddr *sap, size_t *addr_len)
815 unsigned int i, colons;
818 for (i = 0; i < str_len; i++)
819 if (string[i] == ':')
823 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
825 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
829 * Sanity check the NFS transport protocol.
832 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
834 switch (mnt->nfs_server.protocol) {
835 case XPRT_TRANSPORT_UDP:
836 case XPRT_TRANSPORT_TCP:
837 case XPRT_TRANSPORT_RDMA:
840 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
845 * For text based NFSv2/v3 mounts, the mount protocol transport default
846 * settings should depend upon the specified NFS transport.
848 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
850 nfs_validate_transport_protocol(mnt);
852 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
853 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
855 switch (mnt->nfs_server.protocol) {
856 case XPRT_TRANSPORT_UDP:
857 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
859 case XPRT_TRANSPORT_TCP:
860 case XPRT_TRANSPORT_RDMA:
861 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
866 * Parse the value of the 'sec=' option.
868 * The flavor_len setting is for v4 mounts.
870 static int nfs_parse_security_flavors(char *value,
871 struct nfs_parsed_mount_data *mnt)
873 substring_t args[MAX_OPT_ARGS];
875 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
877 switch (match_token(value, nfs_secflavor_tokens, args)) {
879 mnt->auth_flavor_len = 0;
880 mnt->auth_flavors[0] = RPC_AUTH_NULL;
883 mnt->auth_flavor_len = 0;
884 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
887 mnt->auth_flavor_len = 1;
888 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
891 mnt->auth_flavor_len = 1;
892 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
895 mnt->auth_flavor_len = 1;
896 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
899 mnt->auth_flavor_len = 1;
900 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
903 mnt->auth_flavor_len = 1;
904 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
907 mnt->auth_flavor_len = 1;
908 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
911 mnt->auth_flavor_len = 1;
912 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
915 mnt->auth_flavor_len = 1;
916 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
919 mnt->auth_flavor_len = 1;
920 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
929 static void nfs_parse_invalid_value(const char *option)
931 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
935 * Error-check and convert a string of mount options from user space into
936 * a data structure. The whole mount string is processed; bad options are
937 * skipped as they are encountered. If there were no errors, return 1;
938 * otherwise return 0 (zero).
940 static int nfs_parse_mount_options(char *raw,
941 struct nfs_parsed_mount_data *mnt)
943 char *p, *string, *secdata;
944 int rc, sloppy = 0, errors = 0;
947 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
950 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
952 secdata = alloc_secdata();
956 rc = security_sb_copy_data(raw, secdata);
958 goto out_security_failure;
960 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
962 goto out_security_failure;
964 free_secdata(secdata);
966 while ((p = strsep(&raw, ",")) != NULL) {
967 substring_t args[MAX_OPT_ARGS];
973 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
975 token = match_token(p, nfs_mount_option_tokens, args);
979 * boolean options: foo/nofoo
982 mnt->flags |= NFS_MOUNT_SOFT;
985 mnt->flags &= ~NFS_MOUNT_SOFT;
988 mnt->flags |= NFS_MOUNT_POSIX;
991 mnt->flags &= ~NFS_MOUNT_POSIX;
994 mnt->flags &= ~NFS_MOUNT_NOCTO;
997 mnt->flags |= NFS_MOUNT_NOCTO;
1000 mnt->flags &= ~NFS_MOUNT_NOAC;
1003 mnt->flags |= NFS_MOUNT_NOAC;
1006 mnt->flags &= ~NFS_MOUNT_NONLM;
1009 mnt->flags |= NFS_MOUNT_NONLM;
1012 mnt->flags &= ~NFS_MOUNT_VER3;
1015 mnt->flags |= NFS_MOUNT_VER3;
1018 mnt->flags &= ~NFS_MOUNT_TCP;
1019 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1022 mnt->flags |= NFS_MOUNT_TCP;
1023 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1026 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1027 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1030 mnt->flags &= ~NFS_MOUNT_NOACL;
1033 mnt->flags |= NFS_MOUNT_NOACL;
1036 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1038 case Opt_nordirplus:
1039 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1041 case Opt_sharecache:
1042 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1044 case Opt_nosharecache:
1045 mnt->flags |= NFS_MOUNT_UNSHARED;
1049 * options that take numeric values
1052 if (match_int(args, &option) ||
1053 option < 0 || option > USHORT_MAX) {
1055 nfs_parse_invalid_value("port");
1057 mnt->nfs_server.port = option;
1060 if (match_int(args, &option) || option < 0) {
1062 nfs_parse_invalid_value("rsize");
1064 mnt->rsize = option;
1067 if (match_int(args, &option) || option < 0) {
1069 nfs_parse_invalid_value("wsize");
1071 mnt->wsize = option;
1074 if (match_int(args, &option) || option < 0) {
1076 nfs_parse_invalid_value("bsize");
1078 mnt->bsize = option;
1081 if (match_int(args, &option) || option <= 0) {
1083 nfs_parse_invalid_value("timeo");
1085 mnt->timeo = option;
1088 if (match_int(args, &option) || option <= 0) {
1090 nfs_parse_invalid_value("retrans");
1092 mnt->retrans = option;
1095 if (match_int(args, &option) || option < 0) {
1097 nfs_parse_invalid_value("acregmin");
1099 mnt->acregmin = option;
1102 if (match_int(args, &option) || option < 0) {
1104 nfs_parse_invalid_value("acregmax");
1106 mnt->acregmax = option;
1109 if (match_int(args, &option) || option < 0) {
1111 nfs_parse_invalid_value("acdirmin");
1113 mnt->acdirmin = option;
1116 if (match_int(args, &option) || option < 0) {
1118 nfs_parse_invalid_value("acdirmax");
1120 mnt->acdirmax = option;
1123 if (match_int(args, &option) || option < 0) {
1125 nfs_parse_invalid_value("actimeo");
1127 mnt->acregmin = mnt->acregmax =
1128 mnt->acdirmin = mnt->acdirmax = option;
1131 if (match_int(args, &option) || option < 0) {
1133 nfs_parse_invalid_value("namlen");
1135 mnt->namlen = option;
1138 if (match_int(args, &option) ||
1139 option < 0 || option > USHORT_MAX) {
1141 nfs_parse_invalid_value("mountport");
1143 mnt->mount_server.port = option;
1146 if (match_int(args, &option) ||
1147 option < NFS_MNT_VERSION ||
1148 option > NFS_MNT3_VERSION) {
1150 nfs_parse_invalid_value("mountvers");
1152 mnt->mount_server.version = option;
1155 if (match_int(args, &option)) {
1157 nfs_parse_invalid_value("nfsvers");
1162 mnt->flags &= ~NFS_MOUNT_VER3;
1165 mnt->flags |= NFS_MOUNT_VER3;
1169 nfs_parse_invalid_value("nfsvers");
1174 * options that take text values
1177 string = match_strdup(args);
1180 rc = nfs_parse_security_flavors(string, mnt);
1184 dfprintk(MOUNT, "NFS: unrecognized "
1185 "security flavor\n");
1189 string = match_strdup(args);
1192 token = match_token(string,
1193 nfs_xprt_protocol_tokens, args);
1198 mnt->flags &= ~NFS_MOUNT_TCP;
1199 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1202 mnt->flags |= NFS_MOUNT_TCP;
1203 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1206 /* vector side protocols to TCP */
1207 mnt->flags |= NFS_MOUNT_TCP;
1208 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1212 dfprintk(MOUNT, "NFS: unrecognized "
1213 "transport protocol\n");
1216 case Opt_mountproto:
1217 string = match_strdup(args);
1220 token = match_token(string,
1221 nfs_xprt_protocol_tokens, args);
1226 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1229 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1231 case Opt_xprt_rdma: /* not used for side protocols */
1234 dfprintk(MOUNT, "NFS: unrecognized "
1235 "transport protocol\n");
1239 string = match_strdup(args);
1242 nfs_parse_ip_address(string, strlen(string),
1244 &mnt->nfs_server.address,
1245 &mnt->nfs_server.addrlen);
1248 case Opt_clientaddr:
1249 string = match_strdup(args);
1252 kfree(mnt->client_address);
1253 mnt->client_address = string;
1256 string = match_strdup(args);
1259 kfree(mnt->mount_server.hostname);
1260 mnt->mount_server.hostname = string;
1263 string = match_strdup(args);
1266 nfs_parse_ip_address(string, strlen(string),
1268 &mnt->mount_server.address,
1269 &mnt->mount_server.addrlen);
1272 case Opt_lookupcache:
1273 string = match_strdup(args);
1276 token = match_token(string,
1277 nfs_lookupcache_tokens, args);
1280 case Opt_lookupcache_all:
1281 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1283 case Opt_lookupcache_positive:
1284 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1285 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1287 case Opt_lookupcache_none:
1288 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1292 dfprintk(MOUNT, "NFS: invalid "
1293 "lookupcache argument\n");
1302 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1305 case Opt_deprecated:
1306 dfprintk(MOUNT, "NFS: ignoring mount option "
1312 dfprintk(MOUNT, "NFS: unrecognized mount option "
1318 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1319 errors, (errors == 1 ? "" : "s"));
1326 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1328 out_security_failure:
1329 free_secdata(secdata);
1330 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1335 * Use the remote server's MOUNT service to request the NFS file handle
1336 * corresponding to the provided path.
1338 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1339 struct nfs_fh *root_fh)
1341 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1345 if (args->mount_server.version == 0) {
1346 if (args->flags & NFS_MOUNT_VER3)
1347 args->mount_server.version = NFS_MNT3_VERSION;
1349 args->mount_server.version = NFS_MNT_VERSION;
1352 if (args->mount_server.hostname)
1353 hostname = args->mount_server.hostname;
1355 hostname = args->nfs_server.hostname;
1358 * Construct the mount server's address.
1360 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1361 memcpy(sap, &args->nfs_server.address,
1362 args->nfs_server.addrlen);
1363 args->mount_server.addrlen = args->nfs_server.addrlen;
1367 * autobind will be used if mount_server.port == 0
1369 nfs_set_port(sap, args->mount_server.port);
1372 * Now ask the mount server to map our export path
1375 status = nfs_mount(sap,
1376 args->mount_server.addrlen,
1378 args->nfs_server.export_path,
1379 args->mount_server.version,
1380 args->mount_server.protocol,
1385 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1390 static int nfs_parse_simple_hostname(const char *dev_name,
1391 char **hostname, size_t maxnamlen,
1392 char **export_path, size_t maxpathlen)
1395 char *colon, *comma;
1397 colon = strchr(dev_name, ':');
1399 goto out_bad_devname;
1401 len = colon - dev_name;
1402 if (len > maxnamlen)
1405 /* N.B. caller will free nfs_server.hostname in all cases */
1406 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1410 /* kill possible hostname list: not supported */
1411 comma = strchr(*hostname, ',');
1412 if (comma != NULL) {
1413 if (comma == *hostname)
1414 goto out_bad_devname;
1419 len = strlen(colon);
1420 if (len > maxpathlen)
1422 *export_path = kstrndup(colon, len, GFP_KERNEL);
1426 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1430 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1434 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1438 dfprintk(MOUNT, "NFS: server hostname too long\n");
1439 return -ENAMETOOLONG;
1442 dfprintk(MOUNT, "NFS: export pathname too long\n");
1443 return -ENAMETOOLONG;
1447 * Hostname has square brackets around it because it contains one or
1448 * more colons. We look for the first closing square bracket, and a
1449 * colon must follow it.
1451 static int nfs_parse_protected_hostname(const char *dev_name,
1452 char **hostname, size_t maxnamlen,
1453 char **export_path, size_t maxpathlen)
1458 start = (char *)(dev_name + 1);
1460 end = strchr(start, ']');
1462 goto out_bad_devname;
1463 if (*(end + 1) != ':')
1464 goto out_bad_devname;
1467 if (len > maxnamlen)
1470 /* N.B. caller will free nfs_server.hostname in all cases */
1471 *hostname = kstrndup(start, len, GFP_KERNEL);
1472 if (*hostname == NULL)
1477 if (len > maxpathlen)
1479 *export_path = kstrndup(end, len, GFP_KERNEL);
1486 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1490 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1494 dfprintk(MOUNT, "NFS: server hostname too long\n");
1495 return -ENAMETOOLONG;
1498 dfprintk(MOUNT, "NFS: export pathname too long\n");
1499 return -ENAMETOOLONG;
1503 * Split "dev_name" into "hostname:export_path".
1505 * The leftmost colon demarks the split between the server's hostname
1506 * and the export path. If the hostname starts with a left square
1507 * bracket, then it may contain colons.
1509 * Note: caller frees hostname and export path, even on error.
1511 static int nfs_parse_devname(const char *dev_name,
1512 char **hostname, size_t maxnamlen,
1513 char **export_path, size_t maxpathlen)
1515 if (*dev_name == '[')
1516 return nfs_parse_protected_hostname(dev_name,
1517 hostname, maxnamlen,
1518 export_path, maxpathlen);
1520 return nfs_parse_simple_hostname(dev_name,
1521 hostname, maxnamlen,
1522 export_path, maxpathlen);
1526 * Validate the NFS2/NFS3 mount data
1527 * - fills in the mount root filehandle
1529 * For option strings, user space handles the following behaviors:
1531 * + DNS: mapping server host name to IP address ("addr=" option)
1533 * + failure mode: how to behave if a mount request can't be handled
1534 * immediately ("fg/bg" option)
1536 * + retry: how often to retry a mount request ("retry=" option)
1538 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1539 * mountproto=tcp after mountproto=udp, and so on
1541 static int nfs_validate_mount_data(void *options,
1542 struct nfs_parsed_mount_data *args,
1543 struct nfs_fh *mntfh,
1544 const char *dev_name)
1546 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1551 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1552 args->rsize = NFS_MAX_FILE_IO_SIZE;
1553 args->wsize = NFS_MAX_FILE_IO_SIZE;
1554 args->acregmin = NFS_DEF_ACREGMIN;
1555 args->acregmax = NFS_DEF_ACREGMAX;
1556 args->acdirmin = NFS_DEF_ACDIRMIN;
1557 args->acdirmax = NFS_DEF_ACDIRMAX;
1558 args->mount_server.port = 0; /* autobind unless user sets port */
1559 args->nfs_server.port = 0; /* autobind unless user sets port */
1560 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1561 args->auth_flavors[0] = RPC_AUTH_UNIX;
1563 switch (data->version) {
1569 if (data->flags & NFS_MOUNT_VER3)
1571 data->root.size = NFS2_FHSIZE;
1572 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1574 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1577 memset(data->context, 0, sizeof(data->context));
1579 if (data->flags & NFS_MOUNT_VER3) {
1580 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1581 goto out_invalid_fh;
1582 mntfh->size = data->root.size;
1584 mntfh->size = NFS2_FHSIZE;
1587 memcpy(mntfh->data, data->root.data, mntfh->size);
1588 if (mntfh->size < sizeof(mntfh->data))
1589 memset(mntfh->data + mntfh->size, 0,
1590 sizeof(mntfh->data) - mntfh->size);
1593 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1596 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1597 args->rsize = data->rsize;
1598 args->wsize = data->wsize;
1599 args->timeo = data->timeo;
1600 args->retrans = data->retrans;
1601 args->acregmin = data->acregmin;
1602 args->acregmax = data->acregmax;
1603 args->acdirmin = data->acdirmin;
1604 args->acdirmax = data->acdirmax;
1606 memcpy(&args->nfs_server.address, &data->addr,
1607 sizeof(data->addr));
1608 args->nfs_server.addrlen = sizeof(data->addr);
1609 if (!nfs_verify_server_address((struct sockaddr *)
1610 &args->nfs_server.address))
1611 goto out_no_address;
1613 if (!(data->flags & NFS_MOUNT_TCP))
1614 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1615 /* N.B. caller will free nfs_server.hostname in all cases */
1616 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1617 args->namlen = data->namlen;
1618 args->bsize = data->bsize;
1620 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1621 args->auth_flavors[0] = data->pseudoflavor;
1622 if (!args->nfs_server.hostname)
1626 * The legacy version 6 binary mount data from userspace has a
1627 * field used only to transport selinux information into the
1628 * the kernel. To continue to support that functionality we
1629 * have a touch of selinux knowledge here in the NFS code. The
1630 * userspace code converted context=blah to just blah so we are
1631 * converting back to the full string selinux understands.
1633 if (data->context[0]){
1634 #ifdef CONFIG_SECURITY_SELINUX
1636 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1639 strcpy(opts_str, "context=");
1640 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1641 strcat(opts_str, &data->context[0]);
1642 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1655 if (nfs_parse_mount_options((char *)options, args) == 0)
1658 if (!nfs_verify_server_address((struct sockaddr *)
1659 &args->nfs_server.address))
1660 goto out_no_address;
1662 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1663 args->nfs_server.port);
1665 nfs_set_mount_transport_protocol(args);
1667 status = nfs_parse_devname(dev_name,
1668 &args->nfs_server.hostname,
1670 &args->nfs_server.export_path,
1673 status = nfs_try_mount(args, mntfh);
1675 kfree(args->nfs_server.export_path);
1676 args->nfs_server.export_path = NULL;
1685 #ifndef CONFIG_NFS_V3
1686 if (args->flags & NFS_MOUNT_VER3)
1687 goto out_v3_not_compiled;
1688 #endif /* !CONFIG_NFS_V3 */
1693 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1697 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1702 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1705 #ifndef CONFIG_NFS_V3
1706 out_v3_not_compiled:
1707 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1708 return -EPROTONOSUPPORT;
1709 #endif /* !CONFIG_NFS_V3 */
1712 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1716 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1720 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1725 nfs_compare_remount_data(struct nfs_server *nfss,
1726 struct nfs_parsed_mount_data *data)
1728 if (data->flags != nfss->flags ||
1729 data->rsize != nfss->rsize ||
1730 data->wsize != nfss->wsize ||
1731 data->retrans != nfss->client->cl_timeout->to_retries ||
1732 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1733 data->acregmin != nfss->acregmin / HZ ||
1734 data->acregmax != nfss->acregmax / HZ ||
1735 data->acdirmin != nfss->acdirmin / HZ ||
1736 data->acdirmax != nfss->acdirmax / HZ ||
1737 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1738 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1739 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1740 data->nfs_server.addrlen) != 0)
1747 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1750 struct nfs_server *nfss = sb->s_fs_info;
1751 struct nfs_parsed_mount_data *data;
1752 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1753 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1754 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1757 * Userspace mount programs that send binary options generally send
1758 * them populated with default values. We have no way to know which
1759 * ones were explicitly specified. Fall back to legacy behavior and
1760 * just return success.
1762 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1763 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1764 options->version <= 6))))
1767 data = kzalloc(sizeof(*data), GFP_KERNEL);
1771 /* fill out struct with values from existing mount */
1772 data->flags = nfss->flags;
1773 data->rsize = nfss->rsize;
1774 data->wsize = nfss->wsize;
1775 data->retrans = nfss->client->cl_timeout->to_retries;
1776 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1777 data->acregmin = nfss->acregmin / HZ;
1778 data->acregmax = nfss->acregmax / HZ;
1779 data->acdirmin = nfss->acdirmin / HZ;
1780 data->acdirmax = nfss->acdirmax / HZ;
1781 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1782 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1783 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1784 data->nfs_server.addrlen);
1786 /* overwrite those values with any that were specified */
1787 error = nfs_parse_mount_options((char *)options, data);
1791 /* compare new mount options with old ones */
1792 error = nfs_compare_remount_data(nfss, data);
1799 * Initialise the common bits of the superblock
1801 static inline void nfs_initialise_sb(struct super_block *sb)
1803 struct nfs_server *server = NFS_SB(sb);
1805 sb->s_magic = NFS_SUPER_MAGIC;
1807 /* We probably want something more informative here */
1808 snprintf(sb->s_id, sizeof(sb->s_id),
1809 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1811 if (sb->s_blocksize == 0)
1812 sb->s_blocksize = nfs_block_bits(server->wsize,
1813 &sb->s_blocksize_bits);
1815 if (server->flags & NFS_MOUNT_NOAC)
1816 sb->s_flags |= MS_SYNCHRONOUS;
1818 nfs_super_set_maxbytes(sb, server->maxfilesize);
1822 * Finish setting up an NFS2/3 superblock
1824 static void nfs_fill_super(struct super_block *sb,
1825 struct nfs_parsed_mount_data *data)
1827 struct nfs_server *server = NFS_SB(sb);
1829 sb->s_blocksize_bits = 0;
1830 sb->s_blocksize = 0;
1832 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1834 if (server->flags & NFS_MOUNT_VER3) {
1835 /* The VFS shouldn't apply the umask to mode bits. We will do
1836 * so ourselves when necessary.
1838 sb->s_flags |= MS_POSIXACL;
1839 sb->s_time_gran = 1;
1842 sb->s_op = &nfs_sops;
1843 nfs_initialise_sb(sb);
1847 * Finish setting up a cloned NFS2/3 superblock
1849 static void nfs_clone_super(struct super_block *sb,
1850 const struct super_block *old_sb)
1852 struct nfs_server *server = NFS_SB(sb);
1854 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1855 sb->s_blocksize = old_sb->s_blocksize;
1856 sb->s_maxbytes = old_sb->s_maxbytes;
1858 if (server->flags & NFS_MOUNT_VER3) {
1859 /* The VFS shouldn't apply the umask to mode bits. We will do
1860 * so ourselves when necessary.
1862 sb->s_flags |= MS_POSIXACL;
1863 sb->s_time_gran = 1;
1866 sb->s_op = old_sb->s_op;
1867 nfs_initialise_sb(sb);
1870 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1872 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1874 const struct nfs_server *a = s->s_fs_info;
1875 const struct rpc_clnt *clnt_a = a->client;
1876 const struct rpc_clnt *clnt_b = b->client;
1878 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1880 if (a->nfs_client != b->nfs_client)
1882 if (a->flags != b->flags)
1884 if (a->wsize != b->wsize)
1886 if (a->rsize != b->rsize)
1888 if (a->acregmin != b->acregmin)
1890 if (a->acregmax != b->acregmax)
1892 if (a->acdirmin != b->acdirmin)
1894 if (a->acdirmax != b->acdirmax)
1896 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1903 struct nfs_sb_mountdata {
1904 struct nfs_server *server;
1908 static int nfs_set_super(struct super_block *s, void *data)
1910 struct nfs_sb_mountdata *sb_mntdata = data;
1911 struct nfs_server *server = sb_mntdata->server;
1914 s->s_flags = sb_mntdata->mntflags;
1915 s->s_fs_info = server;
1916 ret = set_anon_super(s, server);
1918 server->s_dev = s->s_dev;
1922 static int nfs_compare_super_address(struct nfs_server *server1,
1923 struct nfs_server *server2)
1925 struct sockaddr *sap1, *sap2;
1927 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1928 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1930 if (sap1->sa_family != sap2->sa_family)
1933 switch (sap1->sa_family) {
1935 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1936 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1937 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1939 if (sin1->sin_port != sin2->sin_port)
1944 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1945 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1946 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1948 if (sin1->sin6_port != sin2->sin6_port)
1959 static int nfs_compare_super(struct super_block *sb, void *data)
1961 struct nfs_sb_mountdata *sb_mntdata = data;
1962 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1963 int mntflags = sb_mntdata->mntflags;
1965 if (!nfs_compare_super_address(old, server))
1967 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1968 if (old->flags & NFS_MOUNT_UNSHARED)
1970 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1972 return nfs_compare_mount_options(sb, server, mntflags);
1975 static int nfs_bdi_register(struct nfs_server *server)
1977 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1980 static int nfs_get_sb(struct file_system_type *fs_type,
1981 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1983 struct nfs_server *server = NULL;
1984 struct super_block *s;
1985 struct nfs_parsed_mount_data *data;
1986 struct nfs_fh *mntfh;
1987 struct dentry *mntroot;
1988 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1989 struct nfs_sb_mountdata sb_mntdata = {
1992 int error = -ENOMEM;
1994 data = kzalloc(sizeof(*data), GFP_KERNEL);
1995 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1996 if (data == NULL || mntfh == NULL)
1999 security_init_mnt_opts(&data->lsm_opts);
2001 /* Validate the mount data */
2002 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2006 /* Get a volume representation */
2007 server = nfs_create_server(data, mntfh);
2008 if (IS_ERR(server)) {
2009 error = PTR_ERR(server);
2012 sb_mntdata.server = server;
2014 if (server->flags & NFS_MOUNT_UNSHARED)
2015 compare_super = NULL;
2017 /* Get a superblock - note that we may end up sharing one that already exists */
2018 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2024 if (s->s_fs_info != server) {
2025 nfs_free_server(server);
2028 error = nfs_bdi_register(server);
2030 goto error_splat_super;
2034 /* initial superblock/root creation */
2035 nfs_fill_super(s, data);
2038 mntroot = nfs_get_root(s, mntfh);
2039 if (IS_ERR(mntroot)) {
2040 error = PTR_ERR(mntroot);
2041 goto error_splat_super;
2044 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2046 goto error_splat_root;
2048 s->s_flags |= MS_ACTIVE;
2050 mnt->mnt_root = mntroot;
2054 kfree(data->nfs_server.hostname);
2055 kfree(data->mount_server.hostname);
2056 security_free_mnt_opts(&data->lsm_opts);
2063 nfs_free_server(server);
2069 up_write(&s->s_umount);
2070 deactivate_super(s);
2075 * Destroy an NFS2/3 superblock
2077 static void nfs_kill_super(struct super_block *s)
2079 struct nfs_server *server = NFS_SB(s);
2081 bdi_unregister(&server->backing_dev_info);
2083 nfs_free_server(server);
2087 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2089 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2090 const char *dev_name, void *raw_data,
2091 struct vfsmount *mnt)
2093 struct nfs_clone_mount *data = raw_data;
2094 struct super_block *s;
2095 struct nfs_server *server;
2096 struct dentry *mntroot;
2097 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2098 struct nfs_sb_mountdata sb_mntdata = {
2103 dprintk("--> nfs_xdev_get_sb()\n");
2105 /* create a new volume representation */
2106 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2107 if (IS_ERR(server)) {
2108 error = PTR_ERR(server);
2109 goto out_err_noserver;
2111 sb_mntdata.server = server;
2113 if (server->flags & NFS_MOUNT_UNSHARED)
2114 compare_super = NULL;
2116 /* Get a superblock - note that we may end up sharing one that already exists */
2117 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2123 if (s->s_fs_info != server) {
2124 nfs_free_server(server);
2127 error = nfs_bdi_register(server);
2129 goto error_splat_super;
2133 /* initial superblock/root creation */
2134 nfs_clone_super(s, data->sb);
2137 mntroot = nfs_get_root(s, data->fh);
2138 if (IS_ERR(mntroot)) {
2139 error = PTR_ERR(mntroot);
2140 goto error_splat_super;
2142 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2145 goto error_splat_super;
2148 s->s_flags |= MS_ACTIVE;
2150 mnt->mnt_root = mntroot;
2152 /* clone any lsm security options from the parent to the new sb */
2153 security_sb_clone_mnt_opts(data->sb, s);
2155 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2159 nfs_free_server(server);
2161 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2165 up_write(&s->s_umount);
2166 deactivate_super(s);
2167 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2171 #ifdef CONFIG_NFS_V4
2174 * Finish setting up a cloned NFS4 superblock
2176 static void nfs4_clone_super(struct super_block *sb,
2177 const struct super_block *old_sb)
2179 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2180 sb->s_blocksize = old_sb->s_blocksize;
2181 sb->s_maxbytes = old_sb->s_maxbytes;
2182 sb->s_time_gran = 1;
2183 sb->s_op = old_sb->s_op;
2184 nfs_initialise_sb(sb);
2188 * Set up an NFS4 superblock
2190 static void nfs4_fill_super(struct super_block *sb)
2192 sb->s_time_gran = 1;
2193 sb->s_op = &nfs4_sops;
2194 nfs_initialise_sb(sb);
2198 * Validate NFSv4 mount options
2200 static int nfs4_validate_mount_data(void *options,
2201 struct nfs_parsed_mount_data *args,
2202 const char *dev_name)
2204 struct sockaddr_in *ap;
2205 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2211 args->rsize = NFS_MAX_FILE_IO_SIZE;
2212 args->wsize = NFS_MAX_FILE_IO_SIZE;
2213 args->acregmin = NFS_DEF_ACREGMIN;
2214 args->acregmax = NFS_DEF_ACREGMAX;
2215 args->acdirmin = NFS_DEF_ACDIRMIN;
2216 args->acdirmax = NFS_DEF_ACDIRMAX;
2217 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2218 args->auth_flavors[0] = RPC_AUTH_UNIX;
2219 args->auth_flavor_len = 0;
2221 switch (data->version) {
2223 ap = (struct sockaddr_in *)&args->nfs_server.address;
2224 if (data->host_addrlen > sizeof(args->nfs_server.address))
2225 goto out_no_address;
2226 if (data->host_addrlen == 0)
2227 goto out_no_address;
2228 args->nfs_server.addrlen = data->host_addrlen;
2229 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2231 if (!nfs_verify_server_address((struct sockaddr *)
2232 &args->nfs_server.address))
2233 goto out_no_address;
2235 if (data->auth_flavourlen) {
2236 if (data->auth_flavourlen > 1)
2237 goto out_inval_auth;
2238 if (copy_from_user(&args->auth_flavors[0],
2239 data->auth_flavours,
2240 sizeof(args->auth_flavors[0])))
2244 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2247 args->nfs_server.hostname = c;
2249 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2252 args->nfs_server.export_path = c;
2253 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2255 c = strndup_user(data->client_addr.data, 16);
2258 args->client_address = c;
2261 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2265 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2266 args->rsize = data->rsize;
2267 args->wsize = data->wsize;
2268 args->timeo = data->timeo;
2269 args->retrans = data->retrans;
2270 args->acregmin = data->acregmin;
2271 args->acregmax = data->acregmax;
2272 args->acdirmin = data->acdirmin;
2273 args->acdirmax = data->acdirmax;
2274 args->nfs_server.protocol = data->proto;
2275 nfs_validate_transport_protocol(args);
2281 if (nfs_parse_mount_options((char *)options, args) == 0)
2284 if (!nfs_verify_server_address((struct sockaddr *)
2285 &args->nfs_server.address))
2288 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2289 args->nfs_server.port);
2291 nfs_validate_transport_protocol(args);
2293 if (args->auth_flavor_len > 1)
2294 goto out_inval_auth;
2296 if (args->client_address == NULL)
2297 goto out_no_client_address;
2299 status = nfs_parse_devname(dev_name,
2300 &args->nfs_server.hostname,
2302 &args->nfs_server.export_path,
2314 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2318 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2319 data->auth_flavourlen);
2323 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2326 out_no_client_address:
2327 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2332 * Get the superblock for an NFS4 mountpoint
2334 static int nfs4_get_sb(struct file_system_type *fs_type,
2335 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2337 struct nfs_parsed_mount_data *data;
2338 struct super_block *s;
2339 struct nfs_server *server;
2340 struct nfs_fh *mntfh;
2341 struct dentry *mntroot;
2342 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2343 struct nfs_sb_mountdata sb_mntdata = {
2346 int error = -ENOMEM;
2348 data = kzalloc(sizeof(*data), GFP_KERNEL);
2349 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2350 if (data == NULL || mntfh == NULL)
2353 security_init_mnt_opts(&data->lsm_opts);
2355 /* Validate the mount data */
2356 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2360 /* Get a volume representation */
2361 server = nfs4_create_server(data, mntfh);
2362 if (IS_ERR(server)) {
2363 error = PTR_ERR(server);
2366 sb_mntdata.server = server;
2368 if (server->flags & NFS4_MOUNT_UNSHARED)
2369 compare_super = NULL;
2371 /* Get a superblock - note that we may end up sharing one that already exists */
2372 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2378 if (s->s_fs_info != server) {
2379 nfs_free_server(server);
2382 error = nfs_bdi_register(server);
2384 goto error_splat_super;
2388 /* initial superblock/root creation */
2392 mntroot = nfs4_get_root(s, mntfh);
2393 if (IS_ERR(mntroot)) {
2394 error = PTR_ERR(mntroot);
2395 goto error_splat_super;
2398 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2400 goto error_splat_root;
2402 s->s_flags |= MS_ACTIVE;
2404 mnt->mnt_root = mntroot;
2408 kfree(data->client_address);
2409 kfree(data->nfs_server.export_path);
2410 kfree(data->nfs_server.hostname);
2411 security_free_mnt_opts(&data->lsm_opts);
2418 nfs_free_server(server);
2424 up_write(&s->s_umount);
2425 deactivate_super(s);
2429 static void nfs4_kill_super(struct super_block *sb)
2431 struct nfs_server *server = NFS_SB(sb);
2433 nfs_return_all_delegations(sb);
2434 kill_anon_super(sb);
2436 nfs4_renewd_prepare_shutdown(server);
2437 nfs_free_server(server);
2441 * Clone an NFS4 server record on xdev traversal (FSID-change)
2443 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2444 const char *dev_name, void *raw_data,
2445 struct vfsmount *mnt)
2447 struct nfs_clone_mount *data = raw_data;
2448 struct super_block *s;
2449 struct nfs_server *server;
2450 struct dentry *mntroot;
2451 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2452 struct nfs_sb_mountdata sb_mntdata = {
2457 dprintk("--> nfs4_xdev_get_sb()\n");
2459 /* create a new volume representation */
2460 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2461 if (IS_ERR(server)) {
2462 error = PTR_ERR(server);
2463 goto out_err_noserver;
2465 sb_mntdata.server = server;
2467 if (server->flags & NFS4_MOUNT_UNSHARED)
2468 compare_super = NULL;
2470 /* Get a superblock - note that we may end up sharing one that already exists */
2471 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2477 if (s->s_fs_info != server) {
2478 nfs_free_server(server);
2481 error = nfs_bdi_register(server);
2483 goto error_splat_super;
2487 /* initial superblock/root creation */
2488 nfs4_clone_super(s, data->sb);
2491 mntroot = nfs4_get_root(s, data->fh);
2492 if (IS_ERR(mntroot)) {
2493 error = PTR_ERR(mntroot);
2494 goto error_splat_super;
2496 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2499 goto error_splat_super;
2502 s->s_flags |= MS_ACTIVE;
2504 mnt->mnt_root = mntroot;
2506 security_sb_clone_mnt_opts(data->sb, s);
2508 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2512 nfs_free_server(server);
2514 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2518 up_write(&s->s_umount);
2519 deactivate_super(s);
2520 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2525 * Create an NFS4 server record on referral traversal
2527 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2528 const char *dev_name, void *raw_data,
2529 struct vfsmount *mnt)
2531 struct nfs_clone_mount *data = raw_data;
2532 struct super_block *s;
2533 struct nfs_server *server;
2534 struct dentry *mntroot;
2535 struct nfs_fh mntfh;
2536 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2537 struct nfs_sb_mountdata sb_mntdata = {
2542 dprintk("--> nfs4_referral_get_sb()\n");
2544 /* create a new volume representation */
2545 server = nfs4_create_referral_server(data, &mntfh);
2546 if (IS_ERR(server)) {
2547 error = PTR_ERR(server);
2548 goto out_err_noserver;
2550 sb_mntdata.server = server;
2552 if (server->flags & NFS4_MOUNT_UNSHARED)
2553 compare_super = NULL;
2555 /* Get a superblock - note that we may end up sharing one that already exists */
2556 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2562 if (s->s_fs_info != server) {
2563 nfs_free_server(server);
2566 error = nfs_bdi_register(server);
2568 goto error_splat_super;
2572 /* initial superblock/root creation */
2576 mntroot = nfs4_get_root(s, &mntfh);
2577 if (IS_ERR(mntroot)) {
2578 error = PTR_ERR(mntroot);
2579 goto error_splat_super;
2581 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2584 goto error_splat_super;
2587 s->s_flags |= MS_ACTIVE;
2589 mnt->mnt_root = mntroot;
2591 security_sb_clone_mnt_opts(data->sb, s);
2593 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2597 nfs_free_server(server);
2599 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2603 up_write(&s->s_umount);
2604 deactivate_super(s);
2605 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2609 #endif /* CONFIG_NFS_V4 */