4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/nfs_xdr.h>
52 #include <linux/magic.h>
53 #include <linux/parser.h>
55 #include <asm/system.h>
56 #include <asm/uaccess.h>
60 #include "delegation.h"
65 #define NFSDBG_FACILITY NFSDBG_VFS
68 /* Mount options that take no arguments */
70 Opt_posix, Opt_noposix,
75 Opt_udp, Opt_tcp, Opt_rdma,
77 Opt_rdirplus, Opt_nordirplus,
78 Opt_sharecache, Opt_nosharecache,
79 Opt_resvport, Opt_noresvport,
80 Opt_fscache, Opt_nofscache,
82 /* Mount options that take integer arguments */
84 Opt_rsize, Opt_wsize, Opt_bsize,
85 Opt_timeo, Opt_retrans,
86 Opt_acregmin, Opt_acregmax,
87 Opt_acdirmin, Opt_acdirmax,
94 /* Mount options that take string arguments */
95 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
96 Opt_addr, Opt_mountaddr, Opt_clientaddr,
100 /* Special mount options */
101 Opt_userspace, Opt_deprecated, Opt_sloppy,
106 static const match_table_t nfs_mount_option_tokens = {
107 { Opt_userspace, "bg" },
108 { Opt_userspace, "fg" },
109 { Opt_userspace, "retry=%s" },
111 { Opt_sloppy, "sloppy" },
113 { Opt_soft, "soft" },
114 { Opt_hard, "hard" },
115 { Opt_deprecated, "intr" },
116 { Opt_deprecated, "nointr" },
117 { Opt_posix, "posix" },
118 { Opt_noposix, "noposix" },
120 { Opt_nocto, "nocto" },
122 { Opt_noac, "noac" },
123 { Opt_lock, "lock" },
124 { Opt_nolock, "nolock" },
129 { Opt_rdma, "rdma" },
131 { Opt_noacl, "noacl" },
132 { Opt_rdirplus, "rdirplus" },
133 { Opt_nordirplus, "nordirplus" },
134 { Opt_sharecache, "sharecache" },
135 { Opt_nosharecache, "nosharecache" },
136 { Opt_resvport, "resvport" },
137 { Opt_noresvport, "noresvport" },
138 { Opt_fscache, "fsc" },
139 { Opt_fscache_uniq, "fsc=%s" },
140 { Opt_nofscache, "nofsc" },
142 { Opt_port, "port=%u" },
143 { Opt_rsize, "rsize=%u" },
144 { Opt_wsize, "wsize=%u" },
145 { Opt_bsize, "bsize=%u" },
146 { Opt_timeo, "timeo=%u" },
147 { Opt_retrans, "retrans=%u" },
148 { Opt_acregmin, "acregmin=%u" },
149 { Opt_acregmax, "acregmax=%u" },
150 { Opt_acdirmin, "acdirmin=%u" },
151 { Opt_acdirmax, "acdirmax=%u" },
152 { Opt_actimeo, "actimeo=%u" },
153 { Opt_namelen, "namlen=%u" },
154 { Opt_mountport, "mountport=%u" },
155 { Opt_mountvers, "mountvers=%u" },
156 { Opt_nfsvers, "nfsvers=%u" },
157 { Opt_nfsvers, "vers=%u" },
159 { Opt_sec, "sec=%s" },
160 { Opt_proto, "proto=%s" },
161 { Opt_mountproto, "mountproto=%s" },
162 { Opt_addr, "addr=%s" },
163 { Opt_clientaddr, "clientaddr=%s" },
164 { Opt_mounthost, "mounthost=%s" },
165 { Opt_mountaddr, "mountaddr=%s" },
167 { Opt_lookupcache, "lookupcache=%s" },
173 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
178 static const match_table_t nfs_xprt_protocol_tokens = {
179 { Opt_xprt_udp, "udp" },
180 { Opt_xprt_tcp, "tcp" },
181 { Opt_xprt_rdma, "rdma" },
183 { Opt_xprt_err, NULL }
187 Opt_sec_none, Opt_sec_sys,
188 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
189 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
190 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
195 static const match_table_t nfs_secflavor_tokens = {
196 { Opt_sec_none, "none" },
197 { Opt_sec_none, "null" },
198 { Opt_sec_sys, "sys" },
200 { Opt_sec_krb5, "krb5" },
201 { Opt_sec_krb5i, "krb5i" },
202 { Opt_sec_krb5p, "krb5p" },
204 { Opt_sec_lkey, "lkey" },
205 { Opt_sec_lkeyi, "lkeyi" },
206 { Opt_sec_lkeyp, "lkeyp" },
208 { Opt_sec_spkm, "spkm3" },
209 { Opt_sec_spkmi, "spkm3i" },
210 { Opt_sec_spkmp, "spkm3p" },
212 { Opt_sec_err, NULL }
216 Opt_lookupcache_all, Opt_lookupcache_positive,
217 Opt_lookupcache_none,
222 static match_table_t nfs_lookupcache_tokens = {
223 { Opt_lookupcache_all, "all" },
224 { Opt_lookupcache_positive, "pos" },
225 { Opt_lookupcache_positive, "positive" },
226 { Opt_lookupcache_none, "none" },
228 { Opt_lookupcache_err, NULL }
232 static void nfs_umount_begin(struct super_block *);
233 static int nfs_statfs(struct dentry *, struct kstatfs *);
234 static int nfs_show_options(struct seq_file *, struct vfsmount *);
235 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
236 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
237 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
238 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
239 static void nfs_kill_super(struct super_block *);
240 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
242 static struct file_system_type nfs_fs_type = {
243 .owner = THIS_MODULE,
245 .get_sb = nfs_get_sb,
246 .kill_sb = nfs_kill_super,
247 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
250 struct file_system_type nfs_xdev_fs_type = {
251 .owner = THIS_MODULE,
253 .get_sb = nfs_xdev_get_sb,
254 .kill_sb = nfs_kill_super,
255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
258 static const struct super_operations nfs_sops = {
259 .alloc_inode = nfs_alloc_inode,
260 .destroy_inode = nfs_destroy_inode,
261 .write_inode = nfs_write_inode,
262 .statfs = nfs_statfs,
263 .clear_inode = nfs_clear_inode,
264 .umount_begin = nfs_umount_begin,
265 .show_options = nfs_show_options,
266 .show_stats = nfs_show_stats,
267 .remount_fs = nfs_remount,
271 static int nfs4_get_sb(struct file_system_type *fs_type,
272 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
273 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
274 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
275 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
277 static void nfs4_kill_super(struct super_block *sb);
279 static struct file_system_type nfs4_fs_type = {
280 .owner = THIS_MODULE,
282 .get_sb = nfs4_get_sb,
283 .kill_sb = nfs4_kill_super,
284 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
287 struct file_system_type nfs4_xdev_fs_type = {
288 .owner = THIS_MODULE,
290 .get_sb = nfs4_xdev_get_sb,
291 .kill_sb = nfs4_kill_super,
292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
295 struct file_system_type nfs4_referral_fs_type = {
296 .owner = THIS_MODULE,
298 .get_sb = nfs4_referral_get_sb,
299 .kill_sb = nfs4_kill_super,
300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
303 static const struct super_operations nfs4_sops = {
304 .alloc_inode = nfs_alloc_inode,
305 .destroy_inode = nfs_destroy_inode,
306 .write_inode = nfs_write_inode,
307 .statfs = nfs_statfs,
308 .clear_inode = nfs4_clear_inode,
309 .umount_begin = nfs_umount_begin,
310 .show_options = nfs_show_options,
311 .show_stats = nfs_show_stats,
312 .remount_fs = nfs_remount,
316 static struct shrinker acl_shrinker = {
317 .shrink = nfs_access_cache_shrinker,
318 .seeks = DEFAULT_SEEKS,
322 * Register the NFS filesystems
324 int __init register_nfs_fs(void)
328 ret = register_filesystem(&nfs_fs_type);
332 ret = nfs_register_sysctl();
336 ret = register_filesystem(&nfs4_fs_type);
340 register_shrinker(&acl_shrinker);
345 nfs_unregister_sysctl();
348 unregister_filesystem(&nfs_fs_type);
354 * Unregister the NFS filesystems
356 void __exit unregister_nfs_fs(void)
358 unregister_shrinker(&acl_shrinker);
360 unregister_filesystem(&nfs4_fs_type);
362 nfs_unregister_sysctl();
363 unregister_filesystem(&nfs_fs_type);
366 void nfs_sb_active(struct super_block *sb)
368 struct nfs_server *server = NFS_SB(sb);
370 if (atomic_inc_return(&server->active) == 1)
371 atomic_inc(&sb->s_active);
374 void nfs_sb_deactive(struct super_block *sb)
376 struct nfs_server *server = NFS_SB(sb);
378 if (atomic_dec_and_test(&server->active))
379 deactivate_super(sb);
383 * Deliver file system statistics to userspace
385 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
387 struct nfs_server *server = NFS_SB(dentry->d_sb);
388 unsigned char blockbits;
389 unsigned long blockres;
390 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
391 struct nfs_fattr fattr;
392 struct nfs_fsstat res = {
397 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
400 buf->f_type = NFS_SUPER_MAGIC;
403 * Current versions of glibc do not correctly handle the
404 * case where f_frsize != f_bsize. Eventually we want to
405 * report the value of wtmult in this field.
407 buf->f_frsize = dentry->d_sb->s_blocksize;
410 * On most *nix systems, f_blocks, f_bfree, and f_bavail
411 * are reported in units of f_frsize. Linux hasn't had
412 * an f_frsize field in its statfs struct until recently,
413 * thus historically Linux's sys_statfs reports these
414 * fields in units of f_bsize.
416 buf->f_bsize = dentry->d_sb->s_blocksize;
417 blockbits = dentry->d_sb->s_blocksize_bits;
418 blockres = (1 << blockbits) - 1;
419 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
420 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
421 buf->f_bavail = (res.abytes + blockres) >> blockbits;
423 buf->f_files = res.tfiles;
424 buf->f_ffree = res.afiles;
426 buf->f_namelen = server->namelen;
431 dprintk("%s: statfs error = %d\n", __func__, -error);
436 * Map the security flavour number to a name
438 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
440 static const struct {
441 rpc_authflavor_t flavour;
444 { RPC_AUTH_NULL, "null" },
445 { RPC_AUTH_UNIX, "sys" },
446 { RPC_AUTH_GSS_KRB5, "krb5" },
447 { RPC_AUTH_GSS_KRB5I, "krb5i" },
448 { RPC_AUTH_GSS_KRB5P, "krb5p" },
449 { RPC_AUTH_GSS_LKEY, "lkey" },
450 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
451 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
452 { RPC_AUTH_GSS_SPKM, "spkm" },
453 { RPC_AUTH_GSS_SPKMI, "spkmi" },
454 { RPC_AUTH_GSS_SPKMP, "spkmp" },
455 { UINT_MAX, "unknown" }
459 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
460 if (sec_flavours[i].flavour == flavour)
463 return sec_flavours[i].str;
466 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
469 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
471 switch (sap->sa_family) {
473 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
474 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
478 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
479 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
484 seq_printf(m, ",mountaddr=unspecified");
487 if (nfss->mountd_version || showdefaults)
488 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
489 if (nfss->mountd_port || showdefaults)
490 seq_printf(m, ",mountport=%u", nfss->mountd_port);
492 switch (nfss->mountd_protocol) {
494 seq_printf(m, ",mountproto=udp");
497 seq_printf(m, ",mountproto=tcp");
501 seq_printf(m, ",mountproto=auto");
506 * Describe the mount options in force on this server representation
508 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
511 static const struct proc_nfs_info {
516 { NFS_MOUNT_SOFT, ",soft", ",hard" },
517 { NFS_MOUNT_INTR, ",intr", ",nointr" },
518 { NFS_MOUNT_POSIX, ",posix", "" },
519 { NFS_MOUNT_NOCTO, ",nocto", "" },
520 { NFS_MOUNT_NOAC, ",noac", "" },
521 { NFS_MOUNT_NONLM, ",nolock", "" },
522 { NFS_MOUNT_NOACL, ",noacl", "" },
523 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
524 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
525 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
528 const struct proc_nfs_info *nfs_infop;
529 struct nfs_client *clp = nfss->nfs_client;
530 u32 version = clp->rpc_ops->version;
532 seq_printf(m, ",vers=%u", version);
533 seq_printf(m, ",rsize=%u", nfss->rsize);
534 seq_printf(m, ",wsize=%u", nfss->wsize);
535 if (nfss->bsize != 0)
536 seq_printf(m, ",bsize=%u", nfss->bsize);
537 seq_printf(m, ",namlen=%u", nfss->namelen);
538 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
539 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
540 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
541 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
542 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
543 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
544 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
545 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
546 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
547 if (nfss->flags & nfs_infop->flag)
548 seq_puts(m, nfs_infop->str);
550 seq_puts(m, nfs_infop->nostr);
552 seq_printf(m, ",proto=%s",
553 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
555 if (nfss->port != NFS_PORT)
556 seq_printf(m, ",port=%u", nfss->port);
559 seq_printf(m, ",port=%u", nfss->port);
561 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
562 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
563 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
566 nfs_show_mountd_options(m, nfss, showdefaults);
569 if (clp->rpc_ops->version == 4)
570 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
572 if (nfss->options & NFS_OPTION_FSCACHE)
573 seq_printf(m, ",fsc");
577 * Describe the mount options on this VFS mountpoint
579 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
581 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
583 nfs_show_mount_options(m, nfss, 0);
585 seq_printf(m, ",addr=%s",
586 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
593 * Present statistical information for this VFS mountpoint
595 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
598 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
599 struct rpc_auth *auth = nfss->client->cl_auth;
600 struct nfs_iostats totals = { };
602 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
605 * Display all mount option settings
607 seq_printf(m, "\n\topts:\t");
608 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
609 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
610 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
611 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
612 nfs_show_mount_options(m, nfss, 1);
614 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
616 seq_printf(m, "\n\tcaps:\t");
617 seq_printf(m, "caps=0x%x", nfss->caps);
618 seq_printf(m, ",wtmult=%u", nfss->wtmult);
619 seq_printf(m, ",dtsize=%u", nfss->dtsize);
620 seq_printf(m, ",bsize=%u", nfss->bsize);
621 seq_printf(m, ",namlen=%u", nfss->namelen);
624 if (nfss->nfs_client->rpc_ops->version == 4) {
625 seq_printf(m, "\n\tnfsv4:\t");
626 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
627 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
628 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
633 * Display security flavor in effect for this mount
635 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
637 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
640 * Display superblock I/O counters
642 for_each_possible_cpu(cpu) {
643 struct nfs_iostats *stats;
646 stats = per_cpu_ptr(nfss->io_stats, cpu);
648 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
649 totals.events[i] += stats->events[i];
650 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
651 totals.bytes[i] += stats->bytes[i];
652 #ifdef CONFIG_NFS_FSCACHE
653 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
654 totals.fscache[i] += stats->fscache[i];
660 seq_printf(m, "\n\tevents:\t");
661 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
662 seq_printf(m, "%lu ", totals.events[i]);
663 seq_printf(m, "\n\tbytes:\t");
664 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
665 seq_printf(m, "%Lu ", totals.bytes[i]);
666 #ifdef CONFIG_NFS_FSCACHE
667 if (nfss->options & NFS_OPTION_FSCACHE) {
668 seq_printf(m, "\n\tfsc:\t");
669 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
670 seq_printf(m, "%Lu ", totals.bytes[i]);
675 rpc_print_iostats(m, nfss->client);
681 * Begin unmount by attempting to remove all automounted mountpoints we added
682 * in response to xdev traversals and referrals
684 static void nfs_umount_begin(struct super_block *sb)
686 struct nfs_server *server;
687 struct rpc_clnt *rpc;
692 /* -EIO all pending I/O */
693 rpc = server->client_acl;
695 rpc_killall_tasks(rpc);
696 rpc = server->client;
698 rpc_killall_tasks(rpc);
704 * Sanity-check a server address provided by the mount command.
706 * Address family must be initialized, and address must not be
707 * the ANY address for that family.
709 static int nfs_verify_server_address(struct sockaddr *addr)
711 switch (addr->sa_family) {
713 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
714 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
717 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
718 return !ipv6_addr_any(sa);
725 static void nfs_parse_ipv4_address(char *string, size_t str_len,
726 struct sockaddr *sap, size_t *addr_len)
728 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
729 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
731 if (str_len <= INET_ADDRSTRLEN) {
732 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
733 (int)str_len, string);
735 sin->sin_family = AF_INET;
736 *addr_len = sizeof(*sin);
737 if (in4_pton(string, str_len, addr, '\0', NULL))
741 sap->sa_family = AF_UNSPEC;
745 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
746 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
748 struct sockaddr_in6 *sin6)
753 if ((string + str_len) == delim)
756 if (*delim != IPV6_SCOPE_DELIMITER)
759 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
762 len = (string + str_len) - delim - 1;
763 p = kstrndup(delim + 1, len, GFP_KERNEL);
765 unsigned long scope_id = 0;
766 struct net_device *dev;
768 dev = dev_get_by_name(&init_net, p);
770 scope_id = dev->ifindex;
773 if (strict_strtoul(p, 10, &scope_id) == 0) {
781 sin6->sin6_scope_id = scope_id;
782 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
789 static void nfs_parse_ipv6_address(char *string, size_t str_len,
790 struct sockaddr *sap, size_t *addr_len)
792 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
793 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
796 if (str_len <= INET6_ADDRSTRLEN) {
797 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
798 (int)str_len, string);
800 sin6->sin6_family = AF_INET6;
801 *addr_len = sizeof(*sin6);
802 if (in6_pton(string, str_len, addr,
803 IPV6_SCOPE_DELIMITER, &delim) != 0) {
804 if (nfs_parse_ipv6_scope_id(string, str_len,
810 sap->sa_family = AF_UNSPEC;
814 static void nfs_parse_ipv6_address(char *string, size_t str_len,
815 struct sockaddr *sap, size_t *addr_len)
817 sap->sa_family = AF_UNSPEC;
823 * Construct a sockaddr based on the contents of a string that contains
824 * an IP address in presentation format.
826 * If there is a problem constructing the new sockaddr, set the address
827 * family to AF_UNSPEC.
829 void nfs_parse_ip_address(char *string, size_t str_len,
830 struct sockaddr *sap, size_t *addr_len)
832 unsigned int i, colons;
835 for (i = 0; i < str_len; i++)
836 if (string[i] == ':')
840 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
842 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
846 * Sanity check the NFS transport protocol.
849 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
851 switch (mnt->nfs_server.protocol) {
852 case XPRT_TRANSPORT_UDP:
853 case XPRT_TRANSPORT_TCP:
854 case XPRT_TRANSPORT_RDMA:
857 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
862 * For text based NFSv2/v3 mounts, the mount protocol transport default
863 * settings should depend upon the specified NFS transport.
865 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
867 nfs_validate_transport_protocol(mnt);
869 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
870 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
872 switch (mnt->nfs_server.protocol) {
873 case XPRT_TRANSPORT_UDP:
874 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
876 case XPRT_TRANSPORT_TCP:
877 case XPRT_TRANSPORT_RDMA:
878 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
883 * Parse the value of the 'sec=' option.
885 * The flavor_len setting is for v4 mounts.
887 static int nfs_parse_security_flavors(char *value,
888 struct nfs_parsed_mount_data *mnt)
890 substring_t args[MAX_OPT_ARGS];
892 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
894 switch (match_token(value, nfs_secflavor_tokens, args)) {
896 mnt->auth_flavor_len = 0;
897 mnt->auth_flavors[0] = RPC_AUTH_NULL;
900 mnt->auth_flavor_len = 0;
901 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
904 mnt->auth_flavor_len = 1;
905 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
908 mnt->auth_flavor_len = 1;
909 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
912 mnt->auth_flavor_len = 1;
913 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
916 mnt->auth_flavor_len = 1;
917 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
920 mnt->auth_flavor_len = 1;
921 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
924 mnt->auth_flavor_len = 1;
925 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
928 mnt->auth_flavor_len = 1;
929 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
932 mnt->auth_flavor_len = 1;
933 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
936 mnt->auth_flavor_len = 1;
937 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
946 static void nfs_parse_invalid_value(const char *option)
948 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
952 * Error-check and convert a string of mount options from user space into
953 * a data structure. The whole mount string is processed; bad options are
954 * skipped as they are encountered. If there were no errors, return 1;
955 * otherwise return 0 (zero).
957 static int nfs_parse_mount_options(char *raw,
958 struct nfs_parsed_mount_data *mnt)
960 char *p, *string, *secdata;
961 int rc, sloppy = 0, errors = 0;
964 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
967 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
969 secdata = alloc_secdata();
973 rc = security_sb_copy_data(raw, secdata);
975 goto out_security_failure;
977 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
979 goto out_security_failure;
981 free_secdata(secdata);
983 while ((p = strsep(&raw, ",")) != NULL) {
984 substring_t args[MAX_OPT_ARGS];
990 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
992 token = match_token(p, nfs_mount_option_tokens, args);
996 * boolean options: foo/nofoo
999 mnt->flags |= NFS_MOUNT_SOFT;
1002 mnt->flags &= ~NFS_MOUNT_SOFT;
1005 mnt->flags |= NFS_MOUNT_POSIX;
1008 mnt->flags &= ~NFS_MOUNT_POSIX;
1011 mnt->flags &= ~NFS_MOUNT_NOCTO;
1014 mnt->flags |= NFS_MOUNT_NOCTO;
1017 mnt->flags &= ~NFS_MOUNT_NOAC;
1020 mnt->flags |= NFS_MOUNT_NOAC;
1023 mnt->flags &= ~NFS_MOUNT_NONLM;
1026 mnt->flags |= NFS_MOUNT_NONLM;
1029 mnt->flags &= ~NFS_MOUNT_VER3;
1032 mnt->flags |= NFS_MOUNT_VER3;
1035 mnt->flags &= ~NFS_MOUNT_TCP;
1036 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1039 mnt->flags |= NFS_MOUNT_TCP;
1040 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1043 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1044 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1045 xprt_load_transport(p);
1048 mnt->flags &= ~NFS_MOUNT_NOACL;
1051 mnt->flags |= NFS_MOUNT_NOACL;
1054 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1056 case Opt_nordirplus:
1057 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1059 case Opt_sharecache:
1060 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1062 case Opt_nosharecache:
1063 mnt->flags |= NFS_MOUNT_UNSHARED;
1066 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1068 case Opt_noresvport:
1069 mnt->flags |= NFS_MOUNT_NORESVPORT;
1072 mnt->options |= NFS_OPTION_FSCACHE;
1073 kfree(mnt->fscache_uniq);
1074 mnt->fscache_uniq = NULL;
1077 mnt->options &= ~NFS_OPTION_FSCACHE;
1078 kfree(mnt->fscache_uniq);
1079 mnt->fscache_uniq = NULL;
1081 case Opt_fscache_uniq:
1082 string = match_strdup(args);
1085 kfree(mnt->fscache_uniq);
1086 mnt->fscache_uniq = string;
1087 mnt->options |= NFS_OPTION_FSCACHE;
1091 * options that take numeric values
1094 if (match_int(args, &option) ||
1095 option < 0 || option > USHORT_MAX) {
1097 nfs_parse_invalid_value("port");
1099 mnt->nfs_server.port = option;
1102 if (match_int(args, &option) || option < 0) {
1104 nfs_parse_invalid_value("rsize");
1106 mnt->rsize = option;
1109 if (match_int(args, &option) || option < 0) {
1111 nfs_parse_invalid_value("wsize");
1113 mnt->wsize = option;
1116 if (match_int(args, &option) || option < 0) {
1118 nfs_parse_invalid_value("bsize");
1120 mnt->bsize = option;
1123 if (match_int(args, &option) || option <= 0) {
1125 nfs_parse_invalid_value("timeo");
1127 mnt->timeo = option;
1130 if (match_int(args, &option) || option <= 0) {
1132 nfs_parse_invalid_value("retrans");
1134 mnt->retrans = option;
1137 if (match_int(args, &option) || option < 0) {
1139 nfs_parse_invalid_value("acregmin");
1141 mnt->acregmin = option;
1144 if (match_int(args, &option) || option < 0) {
1146 nfs_parse_invalid_value("acregmax");
1148 mnt->acregmax = option;
1151 if (match_int(args, &option) || option < 0) {
1153 nfs_parse_invalid_value("acdirmin");
1155 mnt->acdirmin = option;
1158 if (match_int(args, &option) || option < 0) {
1160 nfs_parse_invalid_value("acdirmax");
1162 mnt->acdirmax = option;
1165 if (match_int(args, &option) || option < 0) {
1167 nfs_parse_invalid_value("actimeo");
1169 mnt->acregmin = mnt->acregmax =
1170 mnt->acdirmin = mnt->acdirmax = option;
1173 if (match_int(args, &option) || option < 0) {
1175 nfs_parse_invalid_value("namlen");
1177 mnt->namlen = option;
1180 if (match_int(args, &option) ||
1181 option < 0 || option > USHORT_MAX) {
1183 nfs_parse_invalid_value("mountport");
1185 mnt->mount_server.port = option;
1188 if (match_int(args, &option) ||
1189 option < NFS_MNT_VERSION ||
1190 option > NFS_MNT3_VERSION) {
1192 nfs_parse_invalid_value("mountvers");
1194 mnt->mount_server.version = option;
1197 if (match_int(args, &option)) {
1199 nfs_parse_invalid_value("nfsvers");
1204 mnt->flags &= ~NFS_MOUNT_VER3;
1207 mnt->flags |= NFS_MOUNT_VER3;
1211 nfs_parse_invalid_value("nfsvers");
1216 * options that take text values
1219 string = match_strdup(args);
1222 rc = nfs_parse_security_flavors(string, mnt);
1226 dfprintk(MOUNT, "NFS: unrecognized "
1227 "security flavor\n");
1231 string = match_strdup(args);
1234 token = match_token(string,
1235 nfs_xprt_protocol_tokens, args);
1239 mnt->flags &= ~NFS_MOUNT_TCP;
1240 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1243 mnt->flags |= NFS_MOUNT_TCP;
1244 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1247 /* vector side protocols to TCP */
1248 mnt->flags |= NFS_MOUNT_TCP;
1249 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1250 xprt_load_transport(string);
1254 dfprintk(MOUNT, "NFS: unrecognized "
1255 "transport protocol\n");
1259 case Opt_mountproto:
1260 string = match_strdup(args);
1263 token = match_token(string,
1264 nfs_xprt_protocol_tokens, args);
1269 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1272 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1274 case Opt_xprt_rdma: /* not used for side protocols */
1277 dfprintk(MOUNT, "NFS: unrecognized "
1278 "transport protocol\n");
1282 string = match_strdup(args);
1285 nfs_parse_ip_address(string, strlen(string),
1287 &mnt->nfs_server.address,
1288 &mnt->nfs_server.addrlen);
1291 case Opt_clientaddr:
1292 string = match_strdup(args);
1295 kfree(mnt->client_address);
1296 mnt->client_address = string;
1299 string = match_strdup(args);
1302 kfree(mnt->mount_server.hostname);
1303 mnt->mount_server.hostname = string;
1306 string = match_strdup(args);
1309 nfs_parse_ip_address(string, strlen(string),
1311 &mnt->mount_server.address,
1312 &mnt->mount_server.addrlen);
1315 case Opt_lookupcache:
1316 string = match_strdup(args);
1319 token = match_token(string,
1320 nfs_lookupcache_tokens, args);
1323 case Opt_lookupcache_all:
1324 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1326 case Opt_lookupcache_positive:
1327 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1328 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1330 case Opt_lookupcache_none:
1331 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1335 dfprintk(MOUNT, "NFS: invalid "
1336 "lookupcache argument\n");
1345 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1348 case Opt_deprecated:
1349 dfprintk(MOUNT, "NFS: ignoring mount option "
1355 dfprintk(MOUNT, "NFS: unrecognized mount option "
1361 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1362 errors, (errors == 1 ? "" : "s"));
1369 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1371 out_security_failure:
1372 free_secdata(secdata);
1373 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1378 * Use the remote server's MOUNT service to request the NFS file handle
1379 * corresponding to the provided path.
1381 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1382 struct nfs_fh *root_fh)
1384 struct nfs_mount_request request = {
1385 .sap = (struct sockaddr *)
1386 &args->mount_server.address,
1387 .dirpath = args->nfs_server.export_path,
1388 .protocol = args->mount_server.protocol,
1390 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1394 if (args->mount_server.version == 0) {
1395 if (args->flags & NFS_MOUNT_VER3)
1396 args->mount_server.version = NFS_MNT3_VERSION;
1398 args->mount_server.version = NFS_MNT_VERSION;
1400 request.version = args->mount_server.version;
1402 if (args->mount_server.hostname)
1403 request.hostname = args->mount_server.hostname;
1405 request.hostname = args->nfs_server.hostname;
1408 * Construct the mount server's address.
1410 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1411 memcpy(request.sap, &args->nfs_server.address,
1412 args->nfs_server.addrlen);
1413 args->mount_server.addrlen = args->nfs_server.addrlen;
1415 request.salen = args->mount_server.addrlen;
1418 * autobind will be used if mount_server.port == 0
1420 nfs_set_port(request.sap, args->mount_server.port);
1423 * Now ask the mount server to map our export path
1426 status = nfs_mount(&request);
1430 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1431 request.hostname, status);
1435 static int nfs_parse_simple_hostname(const char *dev_name,
1436 char **hostname, size_t maxnamlen,
1437 char **export_path, size_t maxpathlen)
1440 char *colon, *comma;
1442 colon = strchr(dev_name, ':');
1444 goto out_bad_devname;
1446 len = colon - dev_name;
1447 if (len > maxnamlen)
1450 /* N.B. caller will free nfs_server.hostname in all cases */
1451 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1455 /* kill possible hostname list: not supported */
1456 comma = strchr(*hostname, ',');
1457 if (comma != NULL) {
1458 if (comma == *hostname)
1459 goto out_bad_devname;
1464 len = strlen(colon);
1465 if (len > maxpathlen)
1467 *export_path = kstrndup(colon, len, GFP_KERNEL);
1471 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1475 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1479 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1483 dfprintk(MOUNT, "NFS: server hostname too long\n");
1484 return -ENAMETOOLONG;
1487 dfprintk(MOUNT, "NFS: export pathname too long\n");
1488 return -ENAMETOOLONG;
1492 * Hostname has square brackets around it because it contains one or
1493 * more colons. We look for the first closing square bracket, and a
1494 * colon must follow it.
1496 static int nfs_parse_protected_hostname(const char *dev_name,
1497 char **hostname, size_t maxnamlen,
1498 char **export_path, size_t maxpathlen)
1503 start = (char *)(dev_name + 1);
1505 end = strchr(start, ']');
1507 goto out_bad_devname;
1508 if (*(end + 1) != ':')
1509 goto out_bad_devname;
1512 if (len > maxnamlen)
1515 /* N.B. caller will free nfs_server.hostname in all cases */
1516 *hostname = kstrndup(start, len, GFP_KERNEL);
1517 if (*hostname == NULL)
1522 if (len > maxpathlen)
1524 *export_path = kstrndup(end, len, GFP_KERNEL);
1531 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1535 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1539 dfprintk(MOUNT, "NFS: server hostname too long\n");
1540 return -ENAMETOOLONG;
1543 dfprintk(MOUNT, "NFS: export pathname too long\n");
1544 return -ENAMETOOLONG;
1548 * Split "dev_name" into "hostname:export_path".
1550 * The leftmost colon demarks the split between the server's hostname
1551 * and the export path. If the hostname starts with a left square
1552 * bracket, then it may contain colons.
1554 * Note: caller frees hostname and export path, even on error.
1556 static int nfs_parse_devname(const char *dev_name,
1557 char **hostname, size_t maxnamlen,
1558 char **export_path, size_t maxpathlen)
1560 if (*dev_name == '[')
1561 return nfs_parse_protected_hostname(dev_name,
1562 hostname, maxnamlen,
1563 export_path, maxpathlen);
1565 return nfs_parse_simple_hostname(dev_name,
1566 hostname, maxnamlen,
1567 export_path, maxpathlen);
1571 * Validate the NFS2/NFS3 mount data
1572 * - fills in the mount root filehandle
1574 * For option strings, user space handles the following behaviors:
1576 * + DNS: mapping server host name to IP address ("addr=" option)
1578 * + failure mode: how to behave if a mount request can't be handled
1579 * immediately ("fg/bg" option)
1581 * + retry: how often to retry a mount request ("retry=" option)
1583 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1584 * mountproto=tcp after mountproto=udp, and so on
1586 static int nfs_validate_mount_data(void *options,
1587 struct nfs_parsed_mount_data *args,
1588 struct nfs_fh *mntfh,
1589 const char *dev_name)
1591 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1596 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1597 args->rsize = NFS_MAX_FILE_IO_SIZE;
1598 args->wsize = NFS_MAX_FILE_IO_SIZE;
1599 args->acregmin = NFS_DEF_ACREGMIN;
1600 args->acregmax = NFS_DEF_ACREGMAX;
1601 args->acdirmin = NFS_DEF_ACDIRMIN;
1602 args->acdirmax = NFS_DEF_ACDIRMAX;
1603 args->mount_server.port = 0; /* autobind unless user sets port */
1604 args->nfs_server.port = 0; /* autobind unless user sets port */
1605 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1606 args->auth_flavors[0] = RPC_AUTH_UNIX;
1608 switch (data->version) {
1614 if (data->flags & NFS_MOUNT_VER3)
1616 data->root.size = NFS2_FHSIZE;
1617 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1619 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1622 memset(data->context, 0, sizeof(data->context));
1624 if (data->flags & NFS_MOUNT_VER3) {
1625 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1626 goto out_invalid_fh;
1627 mntfh->size = data->root.size;
1629 mntfh->size = NFS2_FHSIZE;
1632 memcpy(mntfh->data, data->root.data, mntfh->size);
1633 if (mntfh->size < sizeof(mntfh->data))
1634 memset(mntfh->data + mntfh->size, 0,
1635 sizeof(mntfh->data) - mntfh->size);
1638 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1641 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1642 args->rsize = data->rsize;
1643 args->wsize = data->wsize;
1644 args->timeo = data->timeo;
1645 args->retrans = data->retrans;
1646 args->acregmin = data->acregmin;
1647 args->acregmax = data->acregmax;
1648 args->acdirmin = data->acdirmin;
1649 args->acdirmax = data->acdirmax;
1651 memcpy(&args->nfs_server.address, &data->addr,
1652 sizeof(data->addr));
1653 args->nfs_server.addrlen = sizeof(data->addr);
1654 if (!nfs_verify_server_address((struct sockaddr *)
1655 &args->nfs_server.address))
1656 goto out_no_address;
1658 if (!(data->flags & NFS_MOUNT_TCP))
1659 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1660 /* N.B. caller will free nfs_server.hostname in all cases */
1661 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1662 args->namlen = data->namlen;
1663 args->bsize = data->bsize;
1665 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1666 args->auth_flavors[0] = data->pseudoflavor;
1667 if (!args->nfs_server.hostname)
1671 * The legacy version 6 binary mount data from userspace has a
1672 * field used only to transport selinux information into the
1673 * the kernel. To continue to support that functionality we
1674 * have a touch of selinux knowledge here in the NFS code. The
1675 * userspace code converted context=blah to just blah so we are
1676 * converting back to the full string selinux understands.
1678 if (data->context[0]){
1679 #ifdef CONFIG_SECURITY_SELINUX
1681 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1684 strcpy(opts_str, "context=");
1685 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1686 strcat(opts_str, &data->context[0]);
1687 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1700 if (nfs_parse_mount_options((char *)options, args) == 0)
1703 if (!nfs_verify_server_address((struct sockaddr *)
1704 &args->nfs_server.address))
1705 goto out_no_address;
1707 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1708 args->nfs_server.port);
1710 nfs_set_mount_transport_protocol(args);
1712 status = nfs_parse_devname(dev_name,
1713 &args->nfs_server.hostname,
1715 &args->nfs_server.export_path,
1718 status = nfs_try_mount(args, mntfh);
1720 kfree(args->nfs_server.export_path);
1721 args->nfs_server.export_path = NULL;
1730 #ifndef CONFIG_NFS_V3
1731 if (args->flags & NFS_MOUNT_VER3)
1732 goto out_v3_not_compiled;
1733 #endif /* !CONFIG_NFS_V3 */
1738 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1742 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1747 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1750 #ifndef CONFIG_NFS_V3
1751 out_v3_not_compiled:
1752 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1753 return -EPROTONOSUPPORT;
1754 #endif /* !CONFIG_NFS_V3 */
1757 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1761 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1765 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1770 nfs_compare_remount_data(struct nfs_server *nfss,
1771 struct nfs_parsed_mount_data *data)
1773 if (data->flags != nfss->flags ||
1774 data->rsize != nfss->rsize ||
1775 data->wsize != nfss->wsize ||
1776 data->retrans != nfss->client->cl_timeout->to_retries ||
1777 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1778 data->acregmin != nfss->acregmin / HZ ||
1779 data->acregmax != nfss->acregmax / HZ ||
1780 data->acdirmin != nfss->acdirmin / HZ ||
1781 data->acdirmax != nfss->acdirmax / HZ ||
1782 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1783 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1784 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1785 data->nfs_server.addrlen) != 0)
1792 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1795 struct nfs_server *nfss = sb->s_fs_info;
1796 struct nfs_parsed_mount_data *data;
1797 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1798 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1799 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1802 * Userspace mount programs that send binary options generally send
1803 * them populated with default values. We have no way to know which
1804 * ones were explicitly specified. Fall back to legacy behavior and
1805 * just return success.
1807 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1808 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1809 options->version <= 6))))
1812 data = kzalloc(sizeof(*data), GFP_KERNEL);
1816 /* fill out struct with values from existing mount */
1817 data->flags = nfss->flags;
1818 data->rsize = nfss->rsize;
1819 data->wsize = nfss->wsize;
1820 data->retrans = nfss->client->cl_timeout->to_retries;
1821 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1822 data->acregmin = nfss->acregmin / HZ;
1823 data->acregmax = nfss->acregmax / HZ;
1824 data->acdirmin = nfss->acdirmin / HZ;
1825 data->acdirmax = nfss->acdirmax / HZ;
1826 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1827 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1828 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1829 data->nfs_server.addrlen);
1831 /* overwrite those values with any that were specified */
1832 error = nfs_parse_mount_options((char *)options, data);
1836 /* compare new mount options with old ones */
1837 error = nfs_compare_remount_data(nfss, data);
1844 * Initialise the common bits of the superblock
1846 static inline void nfs_initialise_sb(struct super_block *sb)
1848 struct nfs_server *server = NFS_SB(sb);
1850 sb->s_magic = NFS_SUPER_MAGIC;
1852 /* We probably want something more informative here */
1853 snprintf(sb->s_id, sizeof(sb->s_id),
1854 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1856 if (sb->s_blocksize == 0)
1857 sb->s_blocksize = nfs_block_bits(server->wsize,
1858 &sb->s_blocksize_bits);
1860 if (server->flags & NFS_MOUNT_NOAC)
1861 sb->s_flags |= MS_SYNCHRONOUS;
1863 nfs_super_set_maxbytes(sb, server->maxfilesize);
1867 * Finish setting up an NFS2/3 superblock
1869 static void nfs_fill_super(struct super_block *sb,
1870 struct nfs_parsed_mount_data *data)
1872 struct nfs_server *server = NFS_SB(sb);
1874 sb->s_blocksize_bits = 0;
1875 sb->s_blocksize = 0;
1877 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1879 if (server->flags & NFS_MOUNT_VER3) {
1880 /* The VFS shouldn't apply the umask to mode bits. We will do
1881 * so ourselves when necessary.
1883 sb->s_flags |= MS_POSIXACL;
1884 sb->s_time_gran = 1;
1887 sb->s_op = &nfs_sops;
1888 nfs_initialise_sb(sb);
1892 * Finish setting up a cloned NFS2/3 superblock
1894 static void nfs_clone_super(struct super_block *sb,
1895 const struct super_block *old_sb)
1897 struct nfs_server *server = NFS_SB(sb);
1899 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1900 sb->s_blocksize = old_sb->s_blocksize;
1901 sb->s_maxbytes = old_sb->s_maxbytes;
1903 if (server->flags & NFS_MOUNT_VER3) {
1904 /* The VFS shouldn't apply the umask to mode bits. We will do
1905 * so ourselves when necessary.
1907 sb->s_flags |= MS_POSIXACL;
1908 sb->s_time_gran = 1;
1911 sb->s_op = old_sb->s_op;
1912 nfs_initialise_sb(sb);
1915 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1917 const struct nfs_server *a = s->s_fs_info;
1918 const struct rpc_clnt *clnt_a = a->client;
1919 const struct rpc_clnt *clnt_b = b->client;
1921 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1923 if (a->nfs_client != b->nfs_client)
1925 if (a->flags != b->flags)
1927 if (a->wsize != b->wsize)
1929 if (a->rsize != b->rsize)
1931 if (a->acregmin != b->acregmin)
1933 if (a->acregmax != b->acregmax)
1935 if (a->acdirmin != b->acdirmin)
1937 if (a->acdirmax != b->acdirmax)
1939 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1946 struct nfs_sb_mountdata {
1947 struct nfs_server *server;
1951 static int nfs_set_super(struct super_block *s, void *data)
1953 struct nfs_sb_mountdata *sb_mntdata = data;
1954 struct nfs_server *server = sb_mntdata->server;
1957 s->s_flags = sb_mntdata->mntflags;
1958 s->s_fs_info = server;
1959 ret = set_anon_super(s, server);
1961 server->s_dev = s->s_dev;
1965 static int nfs_compare_super_address(struct nfs_server *server1,
1966 struct nfs_server *server2)
1968 struct sockaddr *sap1, *sap2;
1970 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1971 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1973 if (sap1->sa_family != sap2->sa_family)
1976 switch (sap1->sa_family) {
1978 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1979 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1980 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1982 if (sin1->sin_port != sin2->sin_port)
1987 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1988 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1989 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1991 if (sin1->sin6_port != sin2->sin6_port)
2002 static int nfs_compare_super(struct super_block *sb, void *data)
2004 struct nfs_sb_mountdata *sb_mntdata = data;
2005 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2006 int mntflags = sb_mntdata->mntflags;
2008 if (!nfs_compare_super_address(old, server))
2010 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2011 if (old->flags & NFS_MOUNT_UNSHARED)
2013 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2015 return nfs_compare_mount_options(sb, server, mntflags);
2018 static int nfs_bdi_register(struct nfs_server *server)
2020 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2023 static int nfs_get_sb(struct file_system_type *fs_type,
2024 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2026 struct nfs_server *server = NULL;
2027 struct super_block *s;
2028 struct nfs_parsed_mount_data *data;
2029 struct nfs_fh *mntfh;
2030 struct dentry *mntroot;
2031 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2032 struct nfs_sb_mountdata sb_mntdata = {
2035 int error = -ENOMEM;
2037 data = kzalloc(sizeof(*data), GFP_KERNEL);
2038 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2039 if (data == NULL || mntfh == NULL)
2042 security_init_mnt_opts(&data->lsm_opts);
2044 /* Validate the mount data */
2045 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2049 /* Get a volume representation */
2050 server = nfs_create_server(data, mntfh);
2051 if (IS_ERR(server)) {
2052 error = PTR_ERR(server);
2055 sb_mntdata.server = server;
2057 if (server->flags & NFS_MOUNT_UNSHARED)
2058 compare_super = NULL;
2060 /* Get a superblock - note that we may end up sharing one that already exists */
2061 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2067 if (s->s_fs_info != server) {
2068 nfs_free_server(server);
2071 error = nfs_bdi_register(server);
2073 goto error_splat_super;
2077 /* initial superblock/root creation */
2078 nfs_fill_super(s, data);
2079 nfs_fscache_get_super_cookie(s, data);
2082 mntroot = nfs_get_root(s, mntfh);
2083 if (IS_ERR(mntroot)) {
2084 error = PTR_ERR(mntroot);
2085 goto error_splat_super;
2088 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2090 goto error_splat_root;
2092 s->s_flags |= MS_ACTIVE;
2094 mnt->mnt_root = mntroot;
2098 kfree(data->nfs_server.hostname);
2099 kfree(data->mount_server.hostname);
2100 kfree(data->fscache_uniq);
2101 security_free_mnt_opts(&data->lsm_opts);
2108 nfs_free_server(server);
2114 deactivate_locked_super(s);
2119 * Destroy an NFS2/3 superblock
2121 static void nfs_kill_super(struct super_block *s)
2123 struct nfs_server *server = NFS_SB(s);
2125 bdi_unregister(&server->backing_dev_info);
2127 nfs_fscache_release_super_cookie(s);
2128 nfs_free_server(server);
2132 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2134 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2135 const char *dev_name, void *raw_data,
2136 struct vfsmount *mnt)
2138 struct nfs_clone_mount *data = raw_data;
2139 struct super_block *s;
2140 struct nfs_server *server;
2141 struct dentry *mntroot;
2142 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2143 struct nfs_sb_mountdata sb_mntdata = {
2148 dprintk("--> nfs_xdev_get_sb()\n");
2150 /* create a new volume representation */
2151 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2152 if (IS_ERR(server)) {
2153 error = PTR_ERR(server);
2154 goto out_err_noserver;
2156 sb_mntdata.server = server;
2158 if (server->flags & NFS_MOUNT_UNSHARED)
2159 compare_super = NULL;
2161 /* Get a superblock - note that we may end up sharing one that already exists */
2162 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2168 if (s->s_fs_info != server) {
2169 nfs_free_server(server);
2172 error = nfs_bdi_register(server);
2174 goto error_splat_super;
2178 /* initial superblock/root creation */
2179 nfs_clone_super(s, data->sb);
2182 mntroot = nfs_get_root(s, data->fh);
2183 if (IS_ERR(mntroot)) {
2184 error = PTR_ERR(mntroot);
2185 goto error_splat_super;
2187 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2190 goto error_splat_super;
2193 s->s_flags |= MS_ACTIVE;
2195 mnt->mnt_root = mntroot;
2197 /* clone any lsm security options from the parent to the new sb */
2198 security_sb_clone_mnt_opts(data->sb, s);
2200 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2204 nfs_free_server(server);
2206 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2210 deactivate_locked_super(s);
2211 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2215 #ifdef CONFIG_NFS_V4
2218 * Finish setting up a cloned NFS4 superblock
2220 static void nfs4_clone_super(struct super_block *sb,
2221 const struct super_block *old_sb)
2223 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2224 sb->s_blocksize = old_sb->s_blocksize;
2225 sb->s_maxbytes = old_sb->s_maxbytes;
2226 sb->s_time_gran = 1;
2227 sb->s_op = old_sb->s_op;
2228 nfs_initialise_sb(sb);
2232 * Set up an NFS4 superblock
2234 static void nfs4_fill_super(struct super_block *sb)
2236 sb->s_time_gran = 1;
2237 sb->s_op = &nfs4_sops;
2238 nfs_initialise_sb(sb);
2242 * Validate NFSv4 mount options
2244 static int nfs4_validate_mount_data(void *options,
2245 struct nfs_parsed_mount_data *args,
2246 const char *dev_name)
2248 struct sockaddr_in *ap;
2249 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2255 args->rsize = NFS_MAX_FILE_IO_SIZE;
2256 args->wsize = NFS_MAX_FILE_IO_SIZE;
2257 args->acregmin = NFS_DEF_ACREGMIN;
2258 args->acregmax = NFS_DEF_ACREGMAX;
2259 args->acdirmin = NFS_DEF_ACDIRMIN;
2260 args->acdirmax = NFS_DEF_ACDIRMAX;
2261 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2262 args->auth_flavors[0] = RPC_AUTH_UNIX;
2263 args->auth_flavor_len = 0;
2265 switch (data->version) {
2267 ap = (struct sockaddr_in *)&args->nfs_server.address;
2268 if (data->host_addrlen > sizeof(args->nfs_server.address))
2269 goto out_no_address;
2270 if (data->host_addrlen == 0)
2271 goto out_no_address;
2272 args->nfs_server.addrlen = data->host_addrlen;
2273 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2275 if (!nfs_verify_server_address((struct sockaddr *)
2276 &args->nfs_server.address))
2277 goto out_no_address;
2279 if (data->auth_flavourlen) {
2280 if (data->auth_flavourlen > 1)
2281 goto out_inval_auth;
2282 if (copy_from_user(&args->auth_flavors[0],
2283 data->auth_flavours,
2284 sizeof(args->auth_flavors[0])))
2288 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2291 args->nfs_server.hostname = c;
2293 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2296 args->nfs_server.export_path = c;
2297 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2299 c = strndup_user(data->client_addr.data, 16);
2302 args->client_address = c;
2305 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2309 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2310 args->rsize = data->rsize;
2311 args->wsize = data->wsize;
2312 args->timeo = data->timeo;
2313 args->retrans = data->retrans;
2314 args->acregmin = data->acregmin;
2315 args->acregmax = data->acregmax;
2316 args->acdirmin = data->acdirmin;
2317 args->acdirmax = data->acdirmax;
2318 args->nfs_server.protocol = data->proto;
2319 nfs_validate_transport_protocol(args);
2325 if (nfs_parse_mount_options((char *)options, args) == 0)
2328 if (!nfs_verify_server_address((struct sockaddr *)
2329 &args->nfs_server.address))
2332 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2333 args->nfs_server.port);
2335 nfs_validate_transport_protocol(args);
2337 if (args->auth_flavor_len > 1)
2338 goto out_inval_auth;
2340 if (args->client_address == NULL)
2341 goto out_no_client_address;
2343 status = nfs_parse_devname(dev_name,
2344 &args->nfs_server.hostname,
2346 &args->nfs_server.export_path,
2358 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2362 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2363 data->auth_flavourlen);
2367 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2370 out_no_client_address:
2371 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2376 * Get the superblock for an NFS4 mountpoint
2378 static int nfs4_get_sb(struct file_system_type *fs_type,
2379 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2381 struct nfs_parsed_mount_data *data;
2382 struct super_block *s;
2383 struct nfs_server *server;
2384 struct nfs_fh *mntfh;
2385 struct dentry *mntroot;
2386 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2387 struct nfs_sb_mountdata sb_mntdata = {
2390 int error = -ENOMEM;
2392 data = kzalloc(sizeof(*data), GFP_KERNEL);
2393 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2394 if (data == NULL || mntfh == NULL)
2397 security_init_mnt_opts(&data->lsm_opts);
2399 /* Validate the mount data */
2400 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2404 /* Get a volume representation */
2405 server = nfs4_create_server(data, mntfh);
2406 if (IS_ERR(server)) {
2407 error = PTR_ERR(server);
2410 sb_mntdata.server = server;
2412 if (server->flags & NFS4_MOUNT_UNSHARED)
2413 compare_super = NULL;
2415 /* Get a superblock - note that we may end up sharing one that already exists */
2416 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2422 if (s->s_fs_info != server) {
2423 nfs_free_server(server);
2426 error = nfs_bdi_register(server);
2428 goto error_splat_super;
2432 /* initial superblock/root creation */
2434 nfs_fscache_get_super_cookie(s, data);
2437 mntroot = nfs4_get_root(s, mntfh);
2438 if (IS_ERR(mntroot)) {
2439 error = PTR_ERR(mntroot);
2440 goto error_splat_super;
2443 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2445 goto error_splat_root;
2447 s->s_flags |= MS_ACTIVE;
2449 mnt->mnt_root = mntroot;
2453 kfree(data->client_address);
2454 kfree(data->nfs_server.export_path);
2455 kfree(data->nfs_server.hostname);
2456 kfree(data->fscache_uniq);
2457 security_free_mnt_opts(&data->lsm_opts);
2464 nfs_free_server(server);
2470 deactivate_locked_super(s);
2474 static void nfs4_kill_super(struct super_block *sb)
2476 struct nfs_server *server = NFS_SB(sb);
2478 nfs_super_return_all_delegations(sb);
2479 kill_anon_super(sb);
2481 nfs4_renewd_prepare_shutdown(server);
2482 nfs_fscache_release_super_cookie(sb);
2483 nfs_free_server(server);
2487 * Clone an NFS4 server record on xdev traversal (FSID-change)
2489 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2490 const char *dev_name, void *raw_data,
2491 struct vfsmount *mnt)
2493 struct nfs_clone_mount *data = raw_data;
2494 struct super_block *s;
2495 struct nfs_server *server;
2496 struct dentry *mntroot;
2497 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2498 struct nfs_sb_mountdata sb_mntdata = {
2503 dprintk("--> nfs4_xdev_get_sb()\n");
2505 /* create a new volume representation */
2506 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2507 if (IS_ERR(server)) {
2508 error = PTR_ERR(server);
2509 goto out_err_noserver;
2511 sb_mntdata.server = server;
2513 if (server->flags & NFS4_MOUNT_UNSHARED)
2514 compare_super = NULL;
2516 /* Get a superblock - note that we may end up sharing one that already exists */
2517 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2523 if (s->s_fs_info != server) {
2524 nfs_free_server(server);
2527 error = nfs_bdi_register(server);
2529 goto error_splat_super;
2533 /* initial superblock/root creation */
2534 nfs4_clone_super(s, data->sb);
2537 mntroot = nfs4_get_root(s, data->fh);
2538 if (IS_ERR(mntroot)) {
2539 error = PTR_ERR(mntroot);
2540 goto error_splat_super;
2542 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2545 goto error_splat_super;
2548 s->s_flags |= MS_ACTIVE;
2550 mnt->mnt_root = mntroot;
2552 security_sb_clone_mnt_opts(data->sb, s);
2554 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2558 nfs_free_server(server);
2560 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2564 deactivate_locked_super(s);
2565 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2570 * Create an NFS4 server record on referral traversal
2572 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2573 const char *dev_name, void *raw_data,
2574 struct vfsmount *mnt)
2576 struct nfs_clone_mount *data = raw_data;
2577 struct super_block *s;
2578 struct nfs_server *server;
2579 struct dentry *mntroot;
2580 struct nfs_fh mntfh;
2581 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2582 struct nfs_sb_mountdata sb_mntdata = {
2587 dprintk("--> nfs4_referral_get_sb()\n");
2589 /* create a new volume representation */
2590 server = nfs4_create_referral_server(data, &mntfh);
2591 if (IS_ERR(server)) {
2592 error = PTR_ERR(server);
2593 goto out_err_noserver;
2595 sb_mntdata.server = server;
2597 if (server->flags & NFS4_MOUNT_UNSHARED)
2598 compare_super = NULL;
2600 /* Get a superblock - note that we may end up sharing one that already exists */
2601 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2607 if (s->s_fs_info != server) {
2608 nfs_free_server(server);
2611 error = nfs_bdi_register(server);
2613 goto error_splat_super;
2617 /* initial superblock/root creation */
2621 mntroot = nfs4_get_root(s, &mntfh);
2622 if (IS_ERR(mntroot)) {
2623 error = PTR_ERR(mntroot);
2624 goto error_splat_super;
2626 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2629 goto error_splat_super;
2632 s->s_flags |= MS_ACTIVE;
2634 mnt->mnt_root = mntroot;
2636 security_sb_clone_mnt_opts(data->sb, s);
2638 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2642 nfs_free_server(server);
2644 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2648 deactivate_locked_super(s);
2649 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2653 #endif /* CONFIG_NFS_V4 */