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 * 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 void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
722 struct sockaddr_in6 *sin6)
727 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
729 if (*delim != IPV6_SCOPE_DELIMITER)
732 len = (string + str_len) - delim - 1;
733 p = kstrndup(delim + 1, len, GFP_KERNEL);
735 unsigned long scope_id = 0;
736 struct net_device *dev;
738 dev = dev_get_by_name(&init_net, p);
740 scope_id = dev->ifindex;
743 /* scope_id is set to zero on error */
744 strict_strtoul(p, 10, &scope_id);
748 sin6->sin6_scope_id = scope_id;
749 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
753 static void nfs_parse_ipv6_address(char *string, size_t str_len,
754 struct sockaddr *sap, size_t *addr_len)
756 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
757 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
760 if (str_len <= INET6_ADDRSTRLEN) {
761 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
762 (int)str_len, string);
764 sin6->sin6_family = AF_INET6;
765 *addr_len = sizeof(*sin6);
766 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
767 nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
772 sap->sa_family = AF_UNSPEC;
776 static void nfs_parse_ipv6_address(char *string, size_t str_len,
777 struct sockaddr *sap, size_t *addr_len)
779 sap->sa_family = AF_UNSPEC;
785 * Construct a sockaddr based on the contents of a string that contains
786 * an IP address in presentation format.
788 * If there is a problem constructing the new sockaddr, set the address
789 * family to AF_UNSPEC.
791 void nfs_parse_ip_address(char *string, size_t str_len,
792 struct sockaddr *sap, size_t *addr_len)
794 unsigned int i, colons;
797 for (i = 0; i < str_len; i++)
798 if (string[i] == ':')
802 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
804 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
808 * Sanity check the NFS transport protocol.
811 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
813 switch (mnt->nfs_server.protocol) {
814 case XPRT_TRANSPORT_UDP:
815 case XPRT_TRANSPORT_TCP:
816 case XPRT_TRANSPORT_RDMA:
819 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
824 * For text based NFSv2/v3 mounts, the mount protocol transport default
825 * settings should depend upon the specified NFS transport.
827 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
829 nfs_validate_transport_protocol(mnt);
831 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
832 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
834 switch (mnt->nfs_server.protocol) {
835 case XPRT_TRANSPORT_UDP:
836 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
838 case XPRT_TRANSPORT_TCP:
839 case XPRT_TRANSPORT_RDMA:
840 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
845 * Parse the value of the 'sec=' option.
847 * The flavor_len setting is for v4 mounts.
849 static int nfs_parse_security_flavors(char *value,
850 struct nfs_parsed_mount_data *mnt)
852 substring_t args[MAX_OPT_ARGS];
854 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
856 switch (match_token(value, nfs_secflavor_tokens, args)) {
858 mnt->auth_flavor_len = 0;
859 mnt->auth_flavors[0] = RPC_AUTH_NULL;
862 mnt->auth_flavor_len = 0;
863 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
866 mnt->auth_flavor_len = 1;
867 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
870 mnt->auth_flavor_len = 1;
871 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
874 mnt->auth_flavor_len = 1;
875 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
878 mnt->auth_flavor_len = 1;
879 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
882 mnt->auth_flavor_len = 1;
883 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
886 mnt->auth_flavor_len = 1;
887 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
890 mnt->auth_flavor_len = 1;
891 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
894 mnt->auth_flavor_len = 1;
895 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
898 mnt->auth_flavor_len = 1;
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
908 static void nfs_parse_invalid_value(const char *option)
910 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
914 * Error-check and convert a string of mount options from user space into
915 * a data structure. The whole mount string is processed; bad options are
916 * skipped as they are encountered. If there were no errors, return 1;
917 * otherwise return 0 (zero).
919 static int nfs_parse_mount_options(char *raw,
920 struct nfs_parsed_mount_data *mnt)
922 char *p, *string, *secdata;
923 int rc, sloppy = 0, errors = 0;
926 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
929 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
931 secdata = alloc_secdata();
935 rc = security_sb_copy_data(raw, secdata);
937 goto out_security_failure;
939 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
941 goto out_security_failure;
943 free_secdata(secdata);
945 while ((p = strsep(&raw, ",")) != NULL) {
946 substring_t args[MAX_OPT_ARGS];
952 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
954 token = match_token(p, nfs_mount_option_tokens, args);
958 * boolean options: foo/nofoo
961 mnt->flags |= NFS_MOUNT_SOFT;
964 mnt->flags &= ~NFS_MOUNT_SOFT;
967 mnt->flags |= NFS_MOUNT_POSIX;
970 mnt->flags &= ~NFS_MOUNT_POSIX;
973 mnt->flags &= ~NFS_MOUNT_NOCTO;
976 mnt->flags |= NFS_MOUNT_NOCTO;
979 mnt->flags &= ~NFS_MOUNT_NOAC;
982 mnt->flags |= NFS_MOUNT_NOAC;
985 mnt->flags &= ~NFS_MOUNT_NONLM;
988 mnt->flags |= NFS_MOUNT_NONLM;
991 mnt->flags &= ~NFS_MOUNT_VER3;
994 mnt->flags |= NFS_MOUNT_VER3;
997 mnt->flags &= ~NFS_MOUNT_TCP;
998 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1001 mnt->flags |= NFS_MOUNT_TCP;
1002 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1005 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1006 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1009 mnt->flags &= ~NFS_MOUNT_NOACL;
1012 mnt->flags |= NFS_MOUNT_NOACL;
1015 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1017 case Opt_nordirplus:
1018 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1020 case Opt_sharecache:
1021 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1023 case Opt_nosharecache:
1024 mnt->flags |= NFS_MOUNT_UNSHARED;
1028 * options that take numeric values
1031 if (match_int(args, &option) ||
1032 option < 0 || option > USHORT_MAX) {
1034 nfs_parse_invalid_value("port");
1036 mnt->nfs_server.port = option;
1039 if (match_int(args, &option) || option < 0) {
1041 nfs_parse_invalid_value("rsize");
1043 mnt->rsize = option;
1046 if (match_int(args, &option) || option < 0) {
1048 nfs_parse_invalid_value("wsize");
1050 mnt->wsize = option;
1053 if (match_int(args, &option) || option < 0) {
1055 nfs_parse_invalid_value("bsize");
1057 mnt->bsize = option;
1060 if (match_int(args, &option) || option <= 0) {
1062 nfs_parse_invalid_value("timeo");
1064 mnt->timeo = option;
1067 if (match_int(args, &option) || option <= 0) {
1069 nfs_parse_invalid_value("retrans");
1071 mnt->retrans = option;
1074 if (match_int(args, &option) || option < 0) {
1076 nfs_parse_invalid_value("acregmin");
1078 mnt->acregmin = option;
1081 if (match_int(args, &option) || option < 0) {
1083 nfs_parse_invalid_value("acregmax");
1085 mnt->acregmax = option;
1088 if (match_int(args, &option) || option < 0) {
1090 nfs_parse_invalid_value("acdirmin");
1092 mnt->acdirmin = option;
1095 if (match_int(args, &option) || option < 0) {
1097 nfs_parse_invalid_value("acdirmax");
1099 mnt->acdirmax = option;
1102 if (match_int(args, &option) || option < 0) {
1104 nfs_parse_invalid_value("actimeo");
1106 mnt->acregmin = mnt->acregmax =
1107 mnt->acdirmin = mnt->acdirmax = option;
1110 if (match_int(args, &option) || option < 0) {
1112 nfs_parse_invalid_value("namlen");
1114 mnt->namlen = option;
1117 if (match_int(args, &option) ||
1118 option < 0 || option > USHORT_MAX) {
1120 nfs_parse_invalid_value("mountport");
1122 mnt->mount_server.port = option;
1125 if (match_int(args, &option) ||
1126 option < NFS_MNT_VERSION ||
1127 option > NFS_MNT3_VERSION) {
1129 nfs_parse_invalid_value("mountvers");
1131 mnt->mount_server.version = option;
1134 if (match_int(args, &option)) {
1136 nfs_parse_invalid_value("nfsvers");
1141 mnt->flags &= ~NFS_MOUNT_VER3;
1144 mnt->flags |= NFS_MOUNT_VER3;
1148 nfs_parse_invalid_value("nfsvers");
1153 * options that take text values
1156 string = match_strdup(args);
1159 rc = nfs_parse_security_flavors(string, mnt);
1163 dfprintk(MOUNT, "NFS: unrecognized "
1164 "security flavor\n");
1168 string = match_strdup(args);
1171 token = match_token(string,
1172 nfs_xprt_protocol_tokens, args);
1177 mnt->flags &= ~NFS_MOUNT_TCP;
1178 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1181 mnt->flags |= NFS_MOUNT_TCP;
1182 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1185 /* vector side protocols to TCP */
1186 mnt->flags |= NFS_MOUNT_TCP;
1187 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1191 dfprintk(MOUNT, "NFS: unrecognized "
1192 "transport protocol\n");
1195 case Opt_mountproto:
1196 string = match_strdup(args);
1199 token = match_token(string,
1200 nfs_xprt_protocol_tokens, args);
1205 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1208 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1210 case Opt_xprt_rdma: /* not used for side protocols */
1213 dfprintk(MOUNT, "NFS: unrecognized "
1214 "transport protocol\n");
1218 string = match_strdup(args);
1221 nfs_parse_ip_address(string, strlen(string),
1223 &mnt->nfs_server.address,
1224 &mnt->nfs_server.addrlen);
1227 case Opt_clientaddr:
1228 string = match_strdup(args);
1231 kfree(mnt->client_address);
1232 mnt->client_address = string;
1235 string = match_strdup(args);
1238 kfree(mnt->mount_server.hostname);
1239 mnt->mount_server.hostname = string;
1242 string = match_strdup(args);
1245 nfs_parse_ip_address(string, strlen(string),
1247 &mnt->mount_server.address,
1248 &mnt->mount_server.addrlen);
1251 case Opt_lookupcache:
1252 string = match_strdup(args);
1255 token = match_token(string,
1256 nfs_lookupcache_tokens, args);
1259 case Opt_lookupcache_all:
1260 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1262 case Opt_lookupcache_positive:
1263 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1264 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1266 case Opt_lookupcache_none:
1267 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1271 dfprintk(MOUNT, "NFS: invalid "
1272 "lookupcache argument\n");
1281 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1284 case Opt_deprecated:
1285 dfprintk(MOUNT, "NFS: ignoring mount option "
1291 dfprintk(MOUNT, "NFS: unrecognized mount option "
1297 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1298 errors, (errors == 1 ? "" : "s"));
1305 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1307 out_security_failure:
1308 free_secdata(secdata);
1309 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1314 * Use the remote server's MOUNT service to request the NFS file handle
1315 * corresponding to the provided path.
1317 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1318 struct nfs_fh *root_fh)
1320 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1324 if (args->mount_server.version == 0) {
1325 if (args->flags & NFS_MOUNT_VER3)
1326 args->mount_server.version = NFS_MNT3_VERSION;
1328 args->mount_server.version = NFS_MNT_VERSION;
1331 if (args->mount_server.hostname)
1332 hostname = args->mount_server.hostname;
1334 hostname = args->nfs_server.hostname;
1337 * Construct the mount server's address.
1339 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1340 memcpy(sap, &args->nfs_server.address,
1341 args->nfs_server.addrlen);
1342 args->mount_server.addrlen = args->nfs_server.addrlen;
1346 * autobind will be used if mount_server.port == 0
1348 nfs_set_port(sap, args->mount_server.port);
1351 * Now ask the mount server to map our export path
1354 status = nfs_mount(sap,
1355 args->mount_server.addrlen,
1357 args->nfs_server.export_path,
1358 args->mount_server.version,
1359 args->mount_server.protocol,
1364 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1369 static int nfs_parse_simple_hostname(const char *dev_name,
1370 char **hostname, size_t maxnamlen,
1371 char **export_path, size_t maxpathlen)
1374 char *colon, *comma;
1376 colon = strchr(dev_name, ':');
1378 goto out_bad_devname;
1380 len = colon - dev_name;
1381 if (len > maxnamlen)
1384 /* N.B. caller will free nfs_server.hostname in all cases */
1385 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1389 /* kill possible hostname list: not supported */
1390 comma = strchr(*hostname, ',');
1391 if (comma != NULL) {
1392 if (comma == *hostname)
1393 goto out_bad_devname;
1398 len = strlen(colon);
1399 if (len > maxpathlen)
1401 *export_path = kstrndup(colon, len, GFP_KERNEL);
1405 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1409 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1413 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1417 dfprintk(MOUNT, "NFS: server hostname too long\n");
1418 return -ENAMETOOLONG;
1421 dfprintk(MOUNT, "NFS: export pathname too long\n");
1422 return -ENAMETOOLONG;
1426 * Hostname has square brackets around it because it contains one or
1427 * more colons. We look for the first closing square bracket, and a
1428 * colon must follow it.
1430 static int nfs_parse_protected_hostname(const char *dev_name,
1431 char **hostname, size_t maxnamlen,
1432 char **export_path, size_t maxpathlen)
1437 start = (char *)(dev_name + 1);
1439 end = strchr(start, ']');
1441 goto out_bad_devname;
1442 if (*(end + 1) != ':')
1443 goto out_bad_devname;
1446 if (len > maxnamlen)
1449 /* N.B. caller will free nfs_server.hostname in all cases */
1450 *hostname = kstrndup(start, len, GFP_KERNEL);
1451 if (*hostname == NULL)
1456 if (len > maxpathlen)
1458 *export_path = kstrndup(end, len, GFP_KERNEL);
1465 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1469 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1473 dfprintk(MOUNT, "NFS: server hostname too long\n");
1474 return -ENAMETOOLONG;
1477 dfprintk(MOUNT, "NFS: export pathname too long\n");
1478 return -ENAMETOOLONG;
1482 * Split "dev_name" into "hostname:export_path".
1484 * The leftmost colon demarks the split between the server's hostname
1485 * and the export path. If the hostname starts with a left square
1486 * bracket, then it may contain colons.
1488 * Note: caller frees hostname and export path, even on error.
1490 static int nfs_parse_devname(const char *dev_name,
1491 char **hostname, size_t maxnamlen,
1492 char **export_path, size_t maxpathlen)
1494 if (*dev_name == '[')
1495 return nfs_parse_protected_hostname(dev_name,
1496 hostname, maxnamlen,
1497 export_path, maxpathlen);
1499 return nfs_parse_simple_hostname(dev_name,
1500 hostname, maxnamlen,
1501 export_path, maxpathlen);
1505 * Validate the NFS2/NFS3 mount data
1506 * - fills in the mount root filehandle
1508 * For option strings, user space handles the following behaviors:
1510 * + DNS: mapping server host name to IP address ("addr=" option)
1512 * + failure mode: how to behave if a mount request can't be handled
1513 * immediately ("fg/bg" option)
1515 * + retry: how often to retry a mount request ("retry=" option)
1517 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1518 * mountproto=tcp after mountproto=udp, and so on
1520 static int nfs_validate_mount_data(void *options,
1521 struct nfs_parsed_mount_data *args,
1522 struct nfs_fh *mntfh,
1523 const char *dev_name)
1525 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1530 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1531 args->rsize = NFS_MAX_FILE_IO_SIZE;
1532 args->wsize = NFS_MAX_FILE_IO_SIZE;
1533 args->acregmin = NFS_DEF_ACREGMIN;
1534 args->acregmax = NFS_DEF_ACREGMAX;
1535 args->acdirmin = NFS_DEF_ACDIRMIN;
1536 args->acdirmax = NFS_DEF_ACDIRMAX;
1537 args->mount_server.port = 0; /* autobind unless user sets port */
1538 args->nfs_server.port = 0; /* autobind unless user sets port */
1539 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1540 args->auth_flavors[0] = RPC_AUTH_UNIX;
1542 switch (data->version) {
1548 if (data->flags & NFS_MOUNT_VER3)
1550 data->root.size = NFS2_FHSIZE;
1551 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1553 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1556 memset(data->context, 0, sizeof(data->context));
1558 if (data->flags & NFS_MOUNT_VER3) {
1559 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1560 goto out_invalid_fh;
1561 mntfh->size = data->root.size;
1563 mntfh->size = NFS2_FHSIZE;
1566 memcpy(mntfh->data, data->root.data, mntfh->size);
1567 if (mntfh->size < sizeof(mntfh->data))
1568 memset(mntfh->data + mntfh->size, 0,
1569 sizeof(mntfh->data) - mntfh->size);
1572 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1575 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1576 args->rsize = data->rsize;
1577 args->wsize = data->wsize;
1578 args->timeo = data->timeo;
1579 args->retrans = data->retrans;
1580 args->acregmin = data->acregmin;
1581 args->acregmax = data->acregmax;
1582 args->acdirmin = data->acdirmin;
1583 args->acdirmax = data->acdirmax;
1585 memcpy(&args->nfs_server.address, &data->addr,
1586 sizeof(data->addr));
1587 args->nfs_server.addrlen = sizeof(data->addr);
1588 if (!nfs_verify_server_address((struct sockaddr *)
1589 &args->nfs_server.address))
1590 goto out_no_address;
1592 if (!(data->flags & NFS_MOUNT_TCP))
1593 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1594 /* N.B. caller will free nfs_server.hostname in all cases */
1595 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1596 args->namlen = data->namlen;
1597 args->bsize = data->bsize;
1599 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1600 args->auth_flavors[0] = data->pseudoflavor;
1601 if (!args->nfs_server.hostname)
1605 * The legacy version 6 binary mount data from userspace has a
1606 * field used only to transport selinux information into the
1607 * the kernel. To continue to support that functionality we
1608 * have a touch of selinux knowledge here in the NFS code. The
1609 * userspace code converted context=blah to just blah so we are
1610 * converting back to the full string selinux understands.
1612 if (data->context[0]){
1613 #ifdef CONFIG_SECURITY_SELINUX
1615 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1618 strcpy(opts_str, "context=");
1619 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1620 strcat(opts_str, &data->context[0]);
1621 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1634 if (nfs_parse_mount_options((char *)options, args) == 0)
1637 if (!nfs_verify_server_address((struct sockaddr *)
1638 &args->nfs_server.address))
1639 goto out_no_address;
1641 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1642 args->nfs_server.port);
1644 nfs_set_mount_transport_protocol(args);
1646 status = nfs_parse_devname(dev_name,
1647 &args->nfs_server.hostname,
1649 &args->nfs_server.export_path,
1652 status = nfs_try_mount(args, mntfh);
1654 kfree(args->nfs_server.export_path);
1655 args->nfs_server.export_path = NULL;
1664 #ifndef CONFIG_NFS_V3
1665 if (args->flags & NFS_MOUNT_VER3)
1666 goto out_v3_not_compiled;
1667 #endif /* !CONFIG_NFS_V3 */
1672 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1676 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1681 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1684 #ifndef CONFIG_NFS_V3
1685 out_v3_not_compiled:
1686 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1687 return -EPROTONOSUPPORT;
1688 #endif /* !CONFIG_NFS_V3 */
1691 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1695 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1699 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1704 nfs_compare_remount_data(struct nfs_server *nfss,
1705 struct nfs_parsed_mount_data *data)
1707 if (data->flags != nfss->flags ||
1708 data->rsize != nfss->rsize ||
1709 data->wsize != nfss->wsize ||
1710 data->retrans != nfss->client->cl_timeout->to_retries ||
1711 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1712 data->acregmin != nfss->acregmin / HZ ||
1713 data->acregmax != nfss->acregmax / HZ ||
1714 data->acdirmin != nfss->acdirmin / HZ ||
1715 data->acdirmax != nfss->acdirmax / HZ ||
1716 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1717 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1718 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1719 data->nfs_server.addrlen) != 0)
1726 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1729 struct nfs_server *nfss = sb->s_fs_info;
1730 struct nfs_parsed_mount_data *data;
1731 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1732 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1733 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1736 * Userspace mount programs that send binary options generally send
1737 * them populated with default values. We have no way to know which
1738 * ones were explicitly specified. Fall back to legacy behavior and
1739 * just return success.
1741 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1742 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1743 options->version <= 6))))
1746 data = kzalloc(sizeof(*data), GFP_KERNEL);
1750 /* fill out struct with values from existing mount */
1751 data->flags = nfss->flags;
1752 data->rsize = nfss->rsize;
1753 data->wsize = nfss->wsize;
1754 data->retrans = nfss->client->cl_timeout->to_retries;
1755 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1756 data->acregmin = nfss->acregmin / HZ;
1757 data->acregmax = nfss->acregmax / HZ;
1758 data->acdirmin = nfss->acdirmin / HZ;
1759 data->acdirmax = nfss->acdirmax / HZ;
1760 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1761 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1762 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1763 data->nfs_server.addrlen);
1765 /* overwrite those values with any that were specified */
1766 error = nfs_parse_mount_options((char *)options, data);
1770 /* compare new mount options with old ones */
1771 error = nfs_compare_remount_data(nfss, data);
1778 * Initialise the common bits of the superblock
1780 static inline void nfs_initialise_sb(struct super_block *sb)
1782 struct nfs_server *server = NFS_SB(sb);
1784 sb->s_magic = NFS_SUPER_MAGIC;
1786 /* We probably want something more informative here */
1787 snprintf(sb->s_id, sizeof(sb->s_id),
1788 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1790 if (sb->s_blocksize == 0)
1791 sb->s_blocksize = nfs_block_bits(server->wsize,
1792 &sb->s_blocksize_bits);
1794 if (server->flags & NFS_MOUNT_NOAC)
1795 sb->s_flags |= MS_SYNCHRONOUS;
1797 nfs_super_set_maxbytes(sb, server->maxfilesize);
1801 * Finish setting up an NFS2/3 superblock
1803 static void nfs_fill_super(struct super_block *sb,
1804 struct nfs_parsed_mount_data *data)
1806 struct nfs_server *server = NFS_SB(sb);
1808 sb->s_blocksize_bits = 0;
1809 sb->s_blocksize = 0;
1811 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1813 if (server->flags & NFS_MOUNT_VER3) {
1814 /* The VFS shouldn't apply the umask to mode bits. We will do
1815 * so ourselves when necessary.
1817 sb->s_flags |= MS_POSIXACL;
1818 sb->s_time_gran = 1;
1821 sb->s_op = &nfs_sops;
1822 nfs_initialise_sb(sb);
1826 * Finish setting up a cloned NFS2/3 superblock
1828 static void nfs_clone_super(struct super_block *sb,
1829 const struct super_block *old_sb)
1831 struct nfs_server *server = NFS_SB(sb);
1833 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1834 sb->s_blocksize = old_sb->s_blocksize;
1835 sb->s_maxbytes = old_sb->s_maxbytes;
1837 if (server->flags & NFS_MOUNT_VER3) {
1838 /* The VFS shouldn't apply the umask to mode bits. We will do
1839 * so ourselves when necessary.
1841 sb->s_flags |= MS_POSIXACL;
1842 sb->s_time_gran = 1;
1845 sb->s_op = old_sb->s_op;
1846 nfs_initialise_sb(sb);
1849 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1851 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1853 const struct nfs_server *a = s->s_fs_info;
1854 const struct rpc_clnt *clnt_a = a->client;
1855 const struct rpc_clnt *clnt_b = b->client;
1857 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1859 if (a->nfs_client != b->nfs_client)
1861 if (a->flags != b->flags)
1863 if (a->wsize != b->wsize)
1865 if (a->rsize != b->rsize)
1867 if (a->acregmin != b->acregmin)
1869 if (a->acregmax != b->acregmax)
1871 if (a->acdirmin != b->acdirmin)
1873 if (a->acdirmax != b->acdirmax)
1875 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1882 struct nfs_sb_mountdata {
1883 struct nfs_server *server;
1887 static int nfs_set_super(struct super_block *s, void *data)
1889 struct nfs_sb_mountdata *sb_mntdata = data;
1890 struct nfs_server *server = sb_mntdata->server;
1893 s->s_flags = sb_mntdata->mntflags;
1894 s->s_fs_info = server;
1895 ret = set_anon_super(s, server);
1897 server->s_dev = s->s_dev;
1901 static int nfs_compare_super_address(struct nfs_server *server1,
1902 struct nfs_server *server2)
1904 struct sockaddr *sap1, *sap2;
1906 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1907 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1909 if (sap1->sa_family != sap2->sa_family)
1912 switch (sap1->sa_family) {
1914 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1915 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1916 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1918 if (sin1->sin_port != sin2->sin_port)
1923 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1924 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1925 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1927 if (sin1->sin6_port != sin2->sin6_port)
1938 static int nfs_compare_super(struct super_block *sb, void *data)
1940 struct nfs_sb_mountdata *sb_mntdata = data;
1941 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1942 int mntflags = sb_mntdata->mntflags;
1944 if (!nfs_compare_super_address(old, server))
1946 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1947 if (old->flags & NFS_MOUNT_UNSHARED)
1949 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1951 return nfs_compare_mount_options(sb, server, mntflags);
1954 static int nfs_bdi_register(struct nfs_server *server)
1956 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1959 static int nfs_get_sb(struct file_system_type *fs_type,
1960 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1962 struct nfs_server *server = NULL;
1963 struct super_block *s;
1964 struct nfs_parsed_mount_data *data;
1965 struct nfs_fh *mntfh;
1966 struct dentry *mntroot;
1967 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1968 struct nfs_sb_mountdata sb_mntdata = {
1971 int error = -ENOMEM;
1973 data = kzalloc(sizeof(*data), GFP_KERNEL);
1974 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1975 if (data == NULL || mntfh == NULL)
1978 security_init_mnt_opts(&data->lsm_opts);
1980 /* Validate the mount data */
1981 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1985 /* Get a volume representation */
1986 server = nfs_create_server(data, mntfh);
1987 if (IS_ERR(server)) {
1988 error = PTR_ERR(server);
1991 sb_mntdata.server = server;
1993 if (server->flags & NFS_MOUNT_UNSHARED)
1994 compare_super = NULL;
1996 /* Get a superblock - note that we may end up sharing one that already exists */
1997 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2003 if (s->s_fs_info != server) {
2004 nfs_free_server(server);
2007 error = nfs_bdi_register(server);
2009 goto error_splat_super;
2013 /* initial superblock/root creation */
2014 nfs_fill_super(s, data);
2017 mntroot = nfs_get_root(s, mntfh);
2018 if (IS_ERR(mntroot)) {
2019 error = PTR_ERR(mntroot);
2020 goto error_splat_super;
2023 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2025 goto error_splat_root;
2027 s->s_flags |= MS_ACTIVE;
2029 mnt->mnt_root = mntroot;
2033 kfree(data->nfs_server.hostname);
2034 kfree(data->mount_server.hostname);
2035 security_free_mnt_opts(&data->lsm_opts);
2042 nfs_free_server(server);
2048 up_write(&s->s_umount);
2049 deactivate_super(s);
2054 * Destroy an NFS2/3 superblock
2056 static void nfs_kill_super(struct super_block *s)
2058 struct nfs_server *server = NFS_SB(s);
2060 bdi_unregister(&server->backing_dev_info);
2062 nfs_free_server(server);
2066 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2068 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2069 const char *dev_name, void *raw_data,
2070 struct vfsmount *mnt)
2072 struct nfs_clone_mount *data = raw_data;
2073 struct super_block *s;
2074 struct nfs_server *server;
2075 struct dentry *mntroot;
2076 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2077 struct nfs_sb_mountdata sb_mntdata = {
2082 dprintk("--> nfs_xdev_get_sb()\n");
2084 /* create a new volume representation */
2085 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2086 if (IS_ERR(server)) {
2087 error = PTR_ERR(server);
2088 goto out_err_noserver;
2090 sb_mntdata.server = server;
2092 if (server->flags & NFS_MOUNT_UNSHARED)
2093 compare_super = NULL;
2095 /* Get a superblock - note that we may end up sharing one that already exists */
2096 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2102 if (s->s_fs_info != server) {
2103 nfs_free_server(server);
2106 error = nfs_bdi_register(server);
2108 goto error_splat_super;
2112 /* initial superblock/root creation */
2113 nfs_clone_super(s, data->sb);
2116 mntroot = nfs_get_root(s, data->fh);
2117 if (IS_ERR(mntroot)) {
2118 error = PTR_ERR(mntroot);
2119 goto error_splat_super;
2121 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2124 goto error_splat_super;
2127 s->s_flags |= MS_ACTIVE;
2129 mnt->mnt_root = mntroot;
2131 /* clone any lsm security options from the parent to the new sb */
2132 security_sb_clone_mnt_opts(data->sb, s);
2134 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2138 nfs_free_server(server);
2140 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2144 up_write(&s->s_umount);
2145 deactivate_super(s);
2146 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2150 #ifdef CONFIG_NFS_V4
2153 * Finish setting up a cloned NFS4 superblock
2155 static void nfs4_clone_super(struct super_block *sb,
2156 const struct super_block *old_sb)
2158 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2159 sb->s_blocksize = old_sb->s_blocksize;
2160 sb->s_maxbytes = old_sb->s_maxbytes;
2161 sb->s_time_gran = 1;
2162 sb->s_op = old_sb->s_op;
2163 nfs_initialise_sb(sb);
2167 * Set up an NFS4 superblock
2169 static void nfs4_fill_super(struct super_block *sb)
2171 sb->s_time_gran = 1;
2172 sb->s_op = &nfs4_sops;
2173 nfs_initialise_sb(sb);
2177 * Validate NFSv4 mount options
2179 static int nfs4_validate_mount_data(void *options,
2180 struct nfs_parsed_mount_data *args,
2181 const char *dev_name)
2183 struct sockaddr_in *ap;
2184 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2190 args->rsize = NFS_MAX_FILE_IO_SIZE;
2191 args->wsize = NFS_MAX_FILE_IO_SIZE;
2192 args->acregmin = NFS_DEF_ACREGMIN;
2193 args->acregmax = NFS_DEF_ACREGMAX;
2194 args->acdirmin = NFS_DEF_ACDIRMIN;
2195 args->acdirmax = NFS_DEF_ACDIRMAX;
2196 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2197 args->auth_flavors[0] = RPC_AUTH_UNIX;
2198 args->auth_flavor_len = 0;
2200 switch (data->version) {
2202 ap = (struct sockaddr_in *)&args->nfs_server.address;
2203 if (data->host_addrlen > sizeof(args->nfs_server.address))
2204 goto out_no_address;
2205 if (data->host_addrlen == 0)
2206 goto out_no_address;
2207 args->nfs_server.addrlen = data->host_addrlen;
2208 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2210 if (!nfs_verify_server_address((struct sockaddr *)
2211 &args->nfs_server.address))
2212 goto out_no_address;
2214 if (data->auth_flavourlen) {
2215 if (data->auth_flavourlen > 1)
2216 goto out_inval_auth;
2217 if (copy_from_user(&args->auth_flavors[0],
2218 data->auth_flavours,
2219 sizeof(args->auth_flavors[0])))
2223 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2226 args->nfs_server.hostname = c;
2228 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2231 args->nfs_server.export_path = c;
2232 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2234 c = strndup_user(data->client_addr.data, 16);
2237 args->client_address = c;
2240 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2244 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2245 args->rsize = data->rsize;
2246 args->wsize = data->wsize;
2247 args->timeo = data->timeo;
2248 args->retrans = data->retrans;
2249 args->acregmin = data->acregmin;
2250 args->acregmax = data->acregmax;
2251 args->acdirmin = data->acdirmin;
2252 args->acdirmax = data->acdirmax;
2253 args->nfs_server.protocol = data->proto;
2254 nfs_validate_transport_protocol(args);
2260 if (nfs_parse_mount_options((char *)options, args) == 0)
2263 if (!nfs_verify_server_address((struct sockaddr *)
2264 &args->nfs_server.address))
2267 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2268 args->nfs_server.port);
2270 nfs_validate_transport_protocol(args);
2272 if (args->auth_flavor_len > 1)
2273 goto out_inval_auth;
2275 if (args->client_address == NULL)
2276 goto out_no_client_address;
2278 status = nfs_parse_devname(dev_name,
2279 &args->nfs_server.hostname,
2281 &args->nfs_server.export_path,
2293 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2297 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2298 data->auth_flavourlen);
2302 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2305 out_no_client_address:
2306 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2311 * Get the superblock for an NFS4 mountpoint
2313 static int nfs4_get_sb(struct file_system_type *fs_type,
2314 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2316 struct nfs_parsed_mount_data *data;
2317 struct super_block *s;
2318 struct nfs_server *server;
2319 struct nfs_fh *mntfh;
2320 struct dentry *mntroot;
2321 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2322 struct nfs_sb_mountdata sb_mntdata = {
2325 int error = -ENOMEM;
2327 data = kzalloc(sizeof(*data), GFP_KERNEL);
2328 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2329 if (data == NULL || mntfh == NULL)
2332 security_init_mnt_opts(&data->lsm_opts);
2334 /* Validate the mount data */
2335 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2339 /* Get a volume representation */
2340 server = nfs4_create_server(data, mntfh);
2341 if (IS_ERR(server)) {
2342 error = PTR_ERR(server);
2345 sb_mntdata.server = server;
2347 if (server->flags & NFS4_MOUNT_UNSHARED)
2348 compare_super = NULL;
2350 /* Get a superblock - note that we may end up sharing one that already exists */
2351 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2357 if (s->s_fs_info != server) {
2358 nfs_free_server(server);
2361 error = nfs_bdi_register(server);
2363 goto error_splat_super;
2367 /* initial superblock/root creation */
2371 mntroot = nfs4_get_root(s, mntfh);
2372 if (IS_ERR(mntroot)) {
2373 error = PTR_ERR(mntroot);
2374 goto error_splat_super;
2377 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2379 goto error_splat_root;
2381 s->s_flags |= MS_ACTIVE;
2383 mnt->mnt_root = mntroot;
2387 kfree(data->client_address);
2388 kfree(data->nfs_server.export_path);
2389 kfree(data->nfs_server.hostname);
2390 security_free_mnt_opts(&data->lsm_opts);
2397 nfs_free_server(server);
2403 up_write(&s->s_umount);
2404 deactivate_super(s);
2408 static void nfs4_kill_super(struct super_block *sb)
2410 struct nfs_server *server = NFS_SB(sb);
2412 nfs_return_all_delegations(sb);
2413 kill_anon_super(sb);
2415 nfs4_renewd_prepare_shutdown(server);
2416 nfs_free_server(server);
2420 * Clone an NFS4 server record on xdev traversal (FSID-change)
2422 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2423 const char *dev_name, void *raw_data,
2424 struct vfsmount *mnt)
2426 struct nfs_clone_mount *data = raw_data;
2427 struct super_block *s;
2428 struct nfs_server *server;
2429 struct dentry *mntroot;
2430 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2431 struct nfs_sb_mountdata sb_mntdata = {
2436 dprintk("--> nfs4_xdev_get_sb()\n");
2438 /* create a new volume representation */
2439 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2440 if (IS_ERR(server)) {
2441 error = PTR_ERR(server);
2442 goto out_err_noserver;
2444 sb_mntdata.server = server;
2446 if (server->flags & NFS4_MOUNT_UNSHARED)
2447 compare_super = NULL;
2449 /* Get a superblock - note that we may end up sharing one that already exists */
2450 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2456 if (s->s_fs_info != server) {
2457 nfs_free_server(server);
2460 error = nfs_bdi_register(server);
2462 goto error_splat_super;
2466 /* initial superblock/root creation */
2467 nfs4_clone_super(s, data->sb);
2470 mntroot = nfs4_get_root(s, data->fh);
2471 if (IS_ERR(mntroot)) {
2472 error = PTR_ERR(mntroot);
2473 goto error_splat_super;
2475 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2478 goto error_splat_super;
2481 s->s_flags |= MS_ACTIVE;
2483 mnt->mnt_root = mntroot;
2485 security_sb_clone_mnt_opts(data->sb, s);
2487 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2491 nfs_free_server(server);
2493 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2497 up_write(&s->s_umount);
2498 deactivate_super(s);
2499 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2504 * Create an NFS4 server record on referral traversal
2506 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2507 const char *dev_name, void *raw_data,
2508 struct vfsmount *mnt)
2510 struct nfs_clone_mount *data = raw_data;
2511 struct super_block *s;
2512 struct nfs_server *server;
2513 struct dentry *mntroot;
2514 struct nfs_fh mntfh;
2515 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2516 struct nfs_sb_mountdata sb_mntdata = {
2521 dprintk("--> nfs4_referral_get_sb()\n");
2523 /* create a new volume representation */
2524 server = nfs4_create_referral_server(data, &mntfh);
2525 if (IS_ERR(server)) {
2526 error = PTR_ERR(server);
2527 goto out_err_noserver;
2529 sb_mntdata.server = server;
2531 if (server->flags & NFS4_MOUNT_UNSHARED)
2532 compare_super = NULL;
2534 /* Get a superblock - note that we may end up sharing one that already exists */
2535 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2541 if (s->s_fs_info != server) {
2542 nfs_free_server(server);
2545 error = nfs_bdi_register(server);
2547 goto error_splat_super;
2551 /* initial superblock/root creation */
2555 mntroot = nfs4_get_root(s, &mntfh);
2556 if (IS_ERR(mntroot)) {
2557 error = PTR_ERR(mntroot);
2558 goto error_splat_super;
2560 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2563 goto error_splat_super;
2566 s->s_flags |= MS_ACTIVE;
2568 mnt->mnt_root = mntroot;
2570 security_sb_clone_mnt_opts(data->sb, s);
2572 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2576 nfs_free_server(server);
2578 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2582 up_write(&s->s_umount);
2583 deactivate_super(s);
2584 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2588 #endif /* CONFIG_NFS_V4 */