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,
95 /* Mount options that take string arguments */
96 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
97 Opt_addr, Opt_mountaddr, Opt_clientaddr,
101 /* Special mount options */
102 Opt_userspace, Opt_deprecated, Opt_sloppy,
107 static const match_table_t nfs_mount_option_tokens = {
108 { Opt_userspace, "bg" },
109 { Opt_userspace, "fg" },
110 { Opt_userspace, "retry=%s" },
112 { Opt_sloppy, "sloppy" },
114 { Opt_soft, "soft" },
115 { Opt_hard, "hard" },
116 { Opt_deprecated, "intr" },
117 { Opt_deprecated, "nointr" },
118 { Opt_posix, "posix" },
119 { Opt_noposix, "noposix" },
121 { Opt_nocto, "nocto" },
123 { Opt_noac, "noac" },
124 { Opt_lock, "lock" },
125 { Opt_nolock, "nolock" },
130 { Opt_rdma, "rdma" },
132 { Opt_noacl, "noacl" },
133 { Opt_rdirplus, "rdirplus" },
134 { Opt_nordirplus, "nordirplus" },
135 { Opt_sharecache, "sharecache" },
136 { Opt_nosharecache, "nosharecache" },
137 { Opt_resvport, "resvport" },
138 { Opt_noresvport, "noresvport" },
139 { Opt_fscache, "fsc" },
140 { Opt_fscache_uniq, "fsc=%s" },
141 { Opt_nofscache, "nofsc" },
143 { Opt_port, "port=%s" },
144 { Opt_rsize, "rsize=%s" },
145 { Opt_wsize, "wsize=%s" },
146 { Opt_bsize, "bsize=%s" },
147 { Opt_timeo, "timeo=%s" },
148 { Opt_retrans, "retrans=%s" },
149 { Opt_acregmin, "acregmin=%s" },
150 { Opt_acregmax, "acregmax=%s" },
151 { Opt_acdirmin, "acdirmin=%s" },
152 { Opt_acdirmax, "acdirmax=%s" },
153 { Opt_actimeo, "actimeo=%s" },
154 { Opt_namelen, "namlen=%s" },
155 { Opt_mountport, "mountport=%s" },
156 { Opt_mountvers, "mountvers=%s" },
157 { Opt_nfsvers, "nfsvers=%s" },
158 { Opt_nfsvers, "vers=%s" },
159 { Opt_minorversion, "minorversion=%u" },
161 { Opt_sec, "sec=%s" },
162 { Opt_proto, "proto=%s" },
163 { Opt_mountproto, "mountproto=%s" },
164 { Opt_addr, "addr=%s" },
165 { Opt_clientaddr, "clientaddr=%s" },
166 { Opt_mounthost, "mounthost=%s" },
167 { Opt_mountaddr, "mountaddr=%s" },
169 { Opt_lookupcache, "lookupcache=%s" },
175 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
180 static const match_table_t nfs_xprt_protocol_tokens = {
181 { Opt_xprt_udp, "udp" },
182 { Opt_xprt_tcp, "tcp" },
183 { Opt_xprt_rdma, "rdma" },
185 { Opt_xprt_err, NULL }
189 Opt_sec_none, Opt_sec_sys,
190 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
191 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
192 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
197 static const match_table_t nfs_secflavor_tokens = {
198 { Opt_sec_none, "none" },
199 { Opt_sec_none, "null" },
200 { Opt_sec_sys, "sys" },
202 { Opt_sec_krb5, "krb5" },
203 { Opt_sec_krb5i, "krb5i" },
204 { Opt_sec_krb5p, "krb5p" },
206 { Opt_sec_lkey, "lkey" },
207 { Opt_sec_lkeyi, "lkeyi" },
208 { Opt_sec_lkeyp, "lkeyp" },
210 { Opt_sec_spkm, "spkm3" },
211 { Opt_sec_spkmi, "spkm3i" },
212 { Opt_sec_spkmp, "spkm3p" },
214 { Opt_sec_err, NULL }
218 Opt_lookupcache_all, Opt_lookupcache_positive,
219 Opt_lookupcache_none,
224 static match_table_t nfs_lookupcache_tokens = {
225 { Opt_lookupcache_all, "all" },
226 { Opt_lookupcache_positive, "pos" },
227 { Opt_lookupcache_positive, "positive" },
228 { Opt_lookupcache_none, "none" },
230 { Opt_lookupcache_err, NULL }
234 static void nfs_umount_begin(struct super_block *);
235 static int nfs_statfs(struct dentry *, struct kstatfs *);
236 static int nfs_show_options(struct seq_file *, struct vfsmount *);
237 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
238 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
239 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
240 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
241 static void nfs_kill_super(struct super_block *);
242 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
244 static struct file_system_type nfs_fs_type = {
245 .owner = THIS_MODULE,
247 .get_sb = nfs_get_sb,
248 .kill_sb = nfs_kill_super,
249 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
252 struct file_system_type nfs_xdev_fs_type = {
253 .owner = THIS_MODULE,
255 .get_sb = nfs_xdev_get_sb,
256 .kill_sb = nfs_kill_super,
257 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
260 static const struct super_operations nfs_sops = {
261 .alloc_inode = nfs_alloc_inode,
262 .destroy_inode = nfs_destroy_inode,
263 .write_inode = nfs_write_inode,
264 .statfs = nfs_statfs,
265 .clear_inode = nfs_clear_inode,
266 .umount_begin = nfs_umount_begin,
267 .show_options = nfs_show_options,
268 .show_stats = nfs_show_stats,
269 .remount_fs = nfs_remount,
273 static int nfs4_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_xdev_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
277 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
279 static void nfs4_kill_super(struct super_block *sb);
281 static struct file_system_type nfs4_fs_type = {
282 .owner = THIS_MODULE,
284 .get_sb = nfs4_get_sb,
285 .kill_sb = nfs4_kill_super,
286 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
289 struct file_system_type nfs4_xdev_fs_type = {
290 .owner = THIS_MODULE,
292 .get_sb = nfs4_xdev_get_sb,
293 .kill_sb = nfs4_kill_super,
294 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
297 struct file_system_type nfs4_referral_fs_type = {
298 .owner = THIS_MODULE,
300 .get_sb = nfs4_referral_get_sb,
301 .kill_sb = nfs4_kill_super,
302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
305 static const struct super_operations nfs4_sops = {
306 .alloc_inode = nfs_alloc_inode,
307 .destroy_inode = nfs_destroy_inode,
308 .write_inode = nfs_write_inode,
309 .statfs = nfs_statfs,
310 .clear_inode = nfs4_clear_inode,
311 .umount_begin = nfs_umount_begin,
312 .show_options = nfs_show_options,
313 .show_stats = nfs_show_stats,
314 .remount_fs = nfs_remount,
318 static struct shrinker acl_shrinker = {
319 .shrink = nfs_access_cache_shrinker,
320 .seeks = DEFAULT_SEEKS,
324 * Register the NFS filesystems
326 int __init register_nfs_fs(void)
330 ret = register_filesystem(&nfs_fs_type);
334 ret = nfs_register_sysctl();
338 ret = register_filesystem(&nfs4_fs_type);
342 register_shrinker(&acl_shrinker);
347 nfs_unregister_sysctl();
350 unregister_filesystem(&nfs_fs_type);
356 * Unregister the NFS filesystems
358 void __exit unregister_nfs_fs(void)
360 unregister_shrinker(&acl_shrinker);
362 unregister_filesystem(&nfs4_fs_type);
364 nfs_unregister_sysctl();
365 unregister_filesystem(&nfs_fs_type);
368 void nfs_sb_active(struct super_block *sb)
370 struct nfs_server *server = NFS_SB(sb);
372 if (atomic_inc_return(&server->active) == 1)
373 atomic_inc(&sb->s_active);
376 void nfs_sb_deactive(struct super_block *sb)
378 struct nfs_server *server = NFS_SB(sb);
380 if (atomic_dec_and_test(&server->active))
381 deactivate_super(sb);
385 * Deliver file system statistics to userspace
387 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
389 struct nfs_server *server = NFS_SB(dentry->d_sb);
390 unsigned char blockbits;
391 unsigned long blockres;
392 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
393 struct nfs_fattr fattr;
394 struct nfs_fsstat res = {
399 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
402 buf->f_type = NFS_SUPER_MAGIC;
405 * Current versions of glibc do not correctly handle the
406 * case where f_frsize != f_bsize. Eventually we want to
407 * report the value of wtmult in this field.
409 buf->f_frsize = dentry->d_sb->s_blocksize;
412 * On most *nix systems, f_blocks, f_bfree, and f_bavail
413 * are reported in units of f_frsize. Linux hasn't had
414 * an f_frsize field in its statfs struct until recently,
415 * thus historically Linux's sys_statfs reports these
416 * fields in units of f_bsize.
418 buf->f_bsize = dentry->d_sb->s_blocksize;
419 blockbits = dentry->d_sb->s_blocksize_bits;
420 blockres = (1 << blockbits) - 1;
421 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
422 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
423 buf->f_bavail = (res.abytes + blockres) >> blockbits;
425 buf->f_files = res.tfiles;
426 buf->f_ffree = res.afiles;
428 buf->f_namelen = server->namelen;
433 dprintk("%s: statfs error = %d\n", __func__, -error);
438 * Map the security flavour number to a name
440 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
442 static const struct {
443 rpc_authflavor_t flavour;
446 { RPC_AUTH_NULL, "null" },
447 { RPC_AUTH_UNIX, "sys" },
448 { RPC_AUTH_GSS_KRB5, "krb5" },
449 { RPC_AUTH_GSS_KRB5I, "krb5i" },
450 { RPC_AUTH_GSS_KRB5P, "krb5p" },
451 { RPC_AUTH_GSS_LKEY, "lkey" },
452 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
453 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
454 { RPC_AUTH_GSS_SPKM, "spkm" },
455 { RPC_AUTH_GSS_SPKMI, "spkmi" },
456 { RPC_AUTH_GSS_SPKMP, "spkmp" },
457 { UINT_MAX, "unknown" }
461 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
462 if (sec_flavours[i].flavour == flavour)
465 return sec_flavours[i].str;
468 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
471 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
473 switch (sap->sa_family) {
475 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
476 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
480 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
481 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
486 seq_printf(m, ",mountaddr=unspecified");
489 if (nfss->mountd_version || showdefaults)
490 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
491 if (nfss->mountd_port || showdefaults)
492 seq_printf(m, ",mountport=%u", nfss->mountd_port);
494 switch (nfss->mountd_protocol) {
496 seq_printf(m, ",mountproto=udp");
499 seq_printf(m, ",mountproto=tcp");
503 seq_printf(m, ",mountproto=auto");
508 * Describe the mount options in force on this server representation
510 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
513 static const struct proc_nfs_info {
518 { NFS_MOUNT_SOFT, ",soft", ",hard" },
519 { NFS_MOUNT_POSIX, ",posix", "" },
520 { NFS_MOUNT_NOCTO, ",nocto", "" },
521 { NFS_MOUNT_NOAC, ",noac", "" },
522 { NFS_MOUNT_NONLM, ",nolock", "" },
523 { NFS_MOUNT_NOACL, ",noacl", "" },
524 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
525 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
526 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
529 const struct proc_nfs_info *nfs_infop;
530 struct nfs_client *clp = nfss->nfs_client;
531 u32 version = clp->rpc_ops->version;
533 seq_printf(m, ",vers=%u", version);
534 seq_printf(m, ",rsize=%u", nfss->rsize);
535 seq_printf(m, ",wsize=%u", nfss->wsize);
536 if (nfss->bsize != 0)
537 seq_printf(m, ",bsize=%u", nfss->bsize);
538 seq_printf(m, ",namlen=%u", nfss->namelen);
539 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
540 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
541 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
542 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
543 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
544 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
545 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
546 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
547 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
548 if (nfss->flags & nfs_infop->flag)
549 seq_puts(m, nfs_infop->str);
551 seq_puts(m, nfs_infop->nostr);
553 seq_printf(m, ",proto=%s",
554 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
556 if (nfss->port != NFS_PORT)
557 seq_printf(m, ",port=%u", nfss->port);
560 seq_printf(m, ",port=%u", nfss->port);
562 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
563 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
564 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
567 nfs_show_mountd_options(m, nfss, showdefaults);
570 if (clp->rpc_ops->version == 4)
571 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
573 if (nfss->options & NFS_OPTION_FSCACHE)
574 seq_printf(m, ",fsc");
578 * Describe the mount options on this VFS mountpoint
580 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
582 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
584 nfs_show_mount_options(m, nfss, 0);
586 seq_printf(m, ",addr=%s",
587 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
594 * Present statistical information for this VFS mountpoint
596 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
599 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
600 struct rpc_auth *auth = nfss->client->cl_auth;
601 struct nfs_iostats totals = { };
603 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
606 * Display all mount option settings
608 seq_printf(m, "\n\topts:\t");
609 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
610 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
611 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
612 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
613 nfs_show_mount_options(m, nfss, 1);
615 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
617 seq_printf(m, "\n\tcaps:\t");
618 seq_printf(m, "caps=0x%x", nfss->caps);
619 seq_printf(m, ",wtmult=%u", nfss->wtmult);
620 seq_printf(m, ",dtsize=%u", nfss->dtsize);
621 seq_printf(m, ",bsize=%u", nfss->bsize);
622 seq_printf(m, ",namlen=%u", nfss->namelen);
625 if (nfss->nfs_client->rpc_ops->version == 4) {
626 seq_printf(m, "\n\tnfsv4:\t");
627 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
628 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
629 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
634 * Display security flavor in effect for this mount
636 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
638 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
641 * Display superblock I/O counters
643 for_each_possible_cpu(cpu) {
644 struct nfs_iostats *stats;
647 stats = per_cpu_ptr(nfss->io_stats, cpu);
649 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
650 totals.events[i] += stats->events[i];
651 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
652 totals.bytes[i] += stats->bytes[i];
653 #ifdef CONFIG_NFS_FSCACHE
654 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
655 totals.fscache[i] += stats->fscache[i];
661 seq_printf(m, "\n\tevents:\t");
662 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
663 seq_printf(m, "%lu ", totals.events[i]);
664 seq_printf(m, "\n\tbytes:\t");
665 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
666 seq_printf(m, "%Lu ", totals.bytes[i]);
667 #ifdef CONFIG_NFS_FSCACHE
668 if (nfss->options & NFS_OPTION_FSCACHE) {
669 seq_printf(m, "\n\tfsc:\t");
670 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
671 seq_printf(m, "%Lu ", totals.bytes[i]);
676 rpc_print_iostats(m, nfss->client);
682 * Begin unmount by attempting to remove all automounted mountpoints we added
683 * in response to xdev traversals and referrals
685 static void nfs_umount_begin(struct super_block *sb)
687 struct nfs_server *server;
688 struct rpc_clnt *rpc;
693 /* -EIO all pending I/O */
694 rpc = server->client_acl;
696 rpc_killall_tasks(rpc);
697 rpc = server->client;
699 rpc_killall_tasks(rpc);
705 * Sanity-check a server address provided by the mount command.
707 * Address family must be initialized, and address must not be
708 * the ANY address for that family.
710 static int nfs_verify_server_address(struct sockaddr *addr)
712 switch (addr->sa_family) {
714 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
715 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
718 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
719 return !ipv6_addr_any(sa);
726 static void nfs_parse_ipv4_address(char *string, size_t str_len,
727 struct sockaddr *sap, size_t *addr_len)
729 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
730 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
732 if (str_len <= INET_ADDRSTRLEN) {
733 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
734 (int)str_len, string);
736 sin->sin_family = AF_INET;
737 *addr_len = sizeof(*sin);
738 if (in4_pton(string, str_len, addr, '\0', NULL))
742 sap->sa_family = AF_UNSPEC;
746 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
747 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
749 struct sockaddr_in6 *sin6)
754 if ((string + str_len) == delim)
757 if (*delim != IPV6_SCOPE_DELIMITER)
760 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
763 len = (string + str_len) - delim - 1;
764 p = kstrndup(delim + 1, len, GFP_KERNEL);
766 unsigned long scope_id = 0;
767 struct net_device *dev;
769 dev = dev_get_by_name(&init_net, p);
771 scope_id = dev->ifindex;
774 if (strict_strtoul(p, 10, &scope_id) == 0) {
782 sin6->sin6_scope_id = scope_id;
783 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
790 static void nfs_parse_ipv6_address(char *string, size_t str_len,
791 struct sockaddr *sap, size_t *addr_len)
793 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
794 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
797 if (str_len <= INET6_ADDRSTRLEN) {
798 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
799 (int)str_len, string);
801 sin6->sin6_family = AF_INET6;
802 *addr_len = sizeof(*sin6);
803 if (in6_pton(string, str_len, addr,
804 IPV6_SCOPE_DELIMITER, &delim) != 0) {
805 if (nfs_parse_ipv6_scope_id(string, str_len,
811 sap->sa_family = AF_UNSPEC;
815 static void nfs_parse_ipv6_address(char *string, size_t str_len,
816 struct sockaddr *sap, size_t *addr_len)
818 sap->sa_family = AF_UNSPEC;
824 * Construct a sockaddr based on the contents of a string that contains
825 * an IP address in presentation format.
827 * If there is a problem constructing the new sockaddr, set the address
828 * family to AF_UNSPEC.
830 void nfs_parse_ip_address(char *string, size_t str_len,
831 struct sockaddr *sap, size_t *addr_len)
833 unsigned int i, colons;
836 for (i = 0; i < str_len; i++)
837 if (string[i] == ':')
841 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
843 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
847 * Sanity check the NFS transport protocol.
850 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
852 switch (mnt->nfs_server.protocol) {
853 case XPRT_TRANSPORT_UDP:
854 case XPRT_TRANSPORT_TCP:
855 case XPRT_TRANSPORT_RDMA:
858 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
863 * For text based NFSv2/v3 mounts, the mount protocol transport default
864 * settings should depend upon the specified NFS transport.
866 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
868 nfs_validate_transport_protocol(mnt);
870 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
871 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
873 switch (mnt->nfs_server.protocol) {
874 case XPRT_TRANSPORT_UDP:
875 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
877 case XPRT_TRANSPORT_TCP:
878 case XPRT_TRANSPORT_RDMA:
879 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
884 * Parse the value of the 'sec=' option.
886 * The flavor_len setting is for v4 mounts.
888 static int nfs_parse_security_flavors(char *value,
889 struct nfs_parsed_mount_data *mnt)
891 substring_t args[MAX_OPT_ARGS];
893 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
895 switch (match_token(value, nfs_secflavor_tokens, args)) {
897 mnt->auth_flavor_len = 0;
898 mnt->auth_flavors[0] = RPC_AUTH_NULL;
901 mnt->auth_flavor_len = 0;
902 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
905 mnt->auth_flavor_len = 1;
906 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
909 mnt->auth_flavor_len = 1;
910 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
913 mnt->auth_flavor_len = 1;
914 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
917 mnt->auth_flavor_len = 1;
918 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
921 mnt->auth_flavor_len = 1;
922 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
925 mnt->auth_flavor_len = 1;
926 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
929 mnt->auth_flavor_len = 1;
930 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
933 mnt->auth_flavor_len = 1;
934 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
937 mnt->auth_flavor_len = 1;
938 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
948 * Error-check and convert a string of mount options from user space into
949 * a data structure. The whole mount string is processed; bad options are
950 * skipped as they are encountered. If there were no errors, return 1;
951 * otherwise return 0 (zero).
953 static int nfs_parse_mount_options(char *raw,
954 struct nfs_parsed_mount_data *mnt)
956 char *p, *string, *secdata;
957 int rc, sloppy = 0, invalid_option = 0;
960 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
963 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
965 secdata = alloc_secdata();
969 rc = security_sb_copy_data(raw, secdata);
971 goto out_security_failure;
973 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
975 goto out_security_failure;
977 free_secdata(secdata);
979 while ((p = strsep(&raw, ",")) != NULL) {
980 substring_t args[MAX_OPT_ARGS];
981 unsigned long option;
988 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
990 token = match_token(p, nfs_mount_option_tokens, args);
994 * boolean options: foo/nofoo
997 mnt->flags |= NFS_MOUNT_SOFT;
1000 mnt->flags &= ~NFS_MOUNT_SOFT;
1003 mnt->flags |= NFS_MOUNT_POSIX;
1006 mnt->flags &= ~NFS_MOUNT_POSIX;
1009 mnt->flags &= ~NFS_MOUNT_NOCTO;
1012 mnt->flags |= NFS_MOUNT_NOCTO;
1015 mnt->flags &= ~NFS_MOUNT_NOAC;
1018 mnt->flags |= NFS_MOUNT_NOAC;
1021 mnt->flags &= ~NFS_MOUNT_NONLM;
1024 mnt->flags |= NFS_MOUNT_NONLM;
1027 mnt->flags &= ~NFS_MOUNT_VER3;
1030 mnt->flags |= NFS_MOUNT_VER3;
1033 mnt->flags &= ~NFS_MOUNT_TCP;
1034 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1037 mnt->flags |= NFS_MOUNT_TCP;
1038 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1041 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1042 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1043 xprt_load_transport(p);
1046 mnt->flags &= ~NFS_MOUNT_NOACL;
1049 mnt->flags |= NFS_MOUNT_NOACL;
1052 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1054 case Opt_nordirplus:
1055 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1057 case Opt_sharecache:
1058 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1060 case Opt_nosharecache:
1061 mnt->flags |= NFS_MOUNT_UNSHARED;
1064 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1066 case Opt_noresvport:
1067 mnt->flags |= NFS_MOUNT_NORESVPORT;
1070 mnt->options |= NFS_OPTION_FSCACHE;
1071 kfree(mnt->fscache_uniq);
1072 mnt->fscache_uniq = NULL;
1075 mnt->options &= ~NFS_OPTION_FSCACHE;
1076 kfree(mnt->fscache_uniq);
1077 mnt->fscache_uniq = NULL;
1079 case Opt_fscache_uniq:
1080 string = match_strdup(args);
1083 kfree(mnt->fscache_uniq);
1084 mnt->fscache_uniq = string;
1085 mnt->options |= NFS_OPTION_FSCACHE;
1089 * options that take numeric values
1092 string = match_strdup(args);
1095 rc = strict_strtoul(string, 10, &option);
1097 if (rc != 0 || option > USHORT_MAX)
1098 goto out_invalid_value;
1099 mnt->nfs_server.port = option;
1102 string = match_strdup(args);
1105 rc = strict_strtoul(string, 10, &option);
1108 goto out_invalid_value;
1109 mnt->rsize = option;
1112 string = match_strdup(args);
1115 rc = strict_strtoul(string, 10, &option);
1118 goto out_invalid_value;
1119 mnt->wsize = option;
1122 string = match_strdup(args);
1125 rc = strict_strtoul(string, 10, &option);
1128 goto out_invalid_value;
1129 mnt->bsize = option;
1132 string = match_strdup(args);
1135 rc = strict_strtoul(string, 10, &option);
1137 if (rc != 0 || option == 0)
1138 goto out_invalid_value;
1139 mnt->timeo = option;
1142 string = match_strdup(args);
1145 rc = strict_strtoul(string, 10, &option);
1147 if (rc != 0 || option == 0)
1148 goto out_invalid_value;
1149 mnt->retrans = option;
1152 string = match_strdup(args);
1155 rc = strict_strtoul(string, 10, &option);
1158 goto out_invalid_value;
1159 mnt->acregmin = option;
1162 string = match_strdup(args);
1165 rc = strict_strtoul(string, 10, &option);
1168 goto out_invalid_value;
1169 mnt->acregmax = option;
1172 string = match_strdup(args);
1175 rc = strict_strtoul(string, 10, &option);
1178 goto out_invalid_value;
1179 mnt->acdirmin = option;
1182 string = match_strdup(args);
1185 rc = strict_strtoul(string, 10, &option);
1188 goto out_invalid_value;
1189 mnt->acdirmax = option;
1192 string = match_strdup(args);
1195 rc = strict_strtoul(string, 10, &option);
1198 goto out_invalid_value;
1199 mnt->acregmin = mnt->acregmax =
1200 mnt->acdirmin = mnt->acdirmax = option;
1203 string = match_strdup(args);
1206 rc = strict_strtoul(string, 10, &option);
1209 goto out_invalid_value;
1210 mnt->namlen = option;
1213 string = match_strdup(args);
1216 rc = strict_strtoul(string, 10, &option);
1218 if (rc != 0 || option > USHORT_MAX)
1219 goto out_invalid_value;
1220 mnt->mount_server.port = option;
1223 string = match_strdup(args);
1226 rc = strict_strtoul(string, 10, &option);
1229 option < NFS_MNT_VERSION ||
1230 option > NFS_MNT3_VERSION)
1231 goto out_invalid_value;
1232 mnt->mount_server.version = option;
1235 string = match_strdup(args);
1238 rc = strict_strtoul(string, 10, &option);
1241 goto out_invalid_value;
1244 mnt->flags &= ~NFS_MOUNT_VER3;
1247 mnt->flags |= NFS_MOUNT_VER3;
1250 goto out_invalid_value;
1253 case Opt_minorversion:
1254 if (match_int(args, &int_option))
1256 if (int_option < 0 || int_option > NFS4_MAX_MINOR_VERSION)
1258 mnt->minorversion = int_option;
1262 * options that take text values
1265 string = match_strdup(args);
1268 rc = nfs_parse_security_flavors(string, mnt);
1271 dfprintk(MOUNT, "NFS: unrecognized "
1272 "security flavor\n");
1277 string = match_strdup(args);
1280 token = match_token(string,
1281 nfs_xprt_protocol_tokens, args);
1285 mnt->flags &= ~NFS_MOUNT_TCP;
1286 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1290 mnt->flags |= NFS_MOUNT_TCP;
1291 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1295 /* vector side protocols to TCP */
1296 mnt->flags |= NFS_MOUNT_TCP;
1297 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1298 xprt_load_transport(string);
1302 dfprintk(MOUNT, "NFS: unrecognized "
1303 "transport protocol\n");
1307 case Opt_mountproto:
1308 string = match_strdup(args);
1311 token = match_token(string,
1312 nfs_xprt_protocol_tokens, args);
1317 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1320 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1322 case Opt_xprt_rdma: /* not used for side protocols */
1324 dfprintk(MOUNT, "NFS: unrecognized "
1325 "transport protocol\n");
1330 string = match_strdup(args);
1333 nfs_parse_ip_address(string, strlen(string),
1335 &mnt->nfs_server.address,
1336 &mnt->nfs_server.addrlen);
1339 case Opt_clientaddr:
1340 string = match_strdup(args);
1343 kfree(mnt->client_address);
1344 mnt->client_address = string;
1347 string = match_strdup(args);
1350 kfree(mnt->mount_server.hostname);
1351 mnt->mount_server.hostname = string;
1354 string = match_strdup(args);
1357 nfs_parse_ip_address(string, strlen(string),
1359 &mnt->mount_server.address,
1360 &mnt->mount_server.addrlen);
1363 case Opt_lookupcache:
1364 string = match_strdup(args);
1367 token = match_token(string,
1368 nfs_lookupcache_tokens, args);
1371 case Opt_lookupcache_all:
1372 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1374 case Opt_lookupcache_positive:
1375 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1376 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1378 case Opt_lookupcache_none:
1379 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1382 dfprintk(MOUNT, "NFS: invalid "
1383 "lookupcache argument\n");
1393 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1396 case Opt_deprecated:
1397 dfprintk(MOUNT, "NFS: ignoring mount option "
1403 dfprintk(MOUNT, "NFS: unrecognized mount option "
1408 if (!sloppy && invalid_option)
1414 printk(KERN_INFO "NFS: bad mount option value specified: %s \n", p);
1417 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1419 out_security_failure:
1420 free_secdata(secdata);
1421 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1426 * Use the remote server's MOUNT service to request the NFS file handle
1427 * corresponding to the provided path.
1429 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1430 struct nfs_fh *root_fh)
1432 unsigned int auth_flavor_len = 0;
1433 struct nfs_mount_request request = {
1434 .sap = (struct sockaddr *)
1435 &args->mount_server.address,
1436 .dirpath = args->nfs_server.export_path,
1437 .protocol = args->mount_server.protocol,
1439 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1440 .auth_flav_len = &auth_flavor_len,
1444 if (args->mount_server.version == 0) {
1445 if (args->flags & NFS_MOUNT_VER3)
1446 args->mount_server.version = NFS_MNT3_VERSION;
1448 args->mount_server.version = NFS_MNT_VERSION;
1450 request.version = args->mount_server.version;
1452 if (args->mount_server.hostname)
1453 request.hostname = args->mount_server.hostname;
1455 request.hostname = args->nfs_server.hostname;
1458 * Construct the mount server's address.
1460 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1461 memcpy(request.sap, &args->nfs_server.address,
1462 args->nfs_server.addrlen);
1463 args->mount_server.addrlen = args->nfs_server.addrlen;
1465 request.salen = args->mount_server.addrlen;
1468 * autobind will be used if mount_server.port == 0
1470 nfs_set_port(request.sap, args->mount_server.port);
1473 * Now ask the mount server to map our export path
1476 status = nfs_mount(&request);
1480 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1481 request.hostname, status);
1485 static int nfs_parse_simple_hostname(const char *dev_name,
1486 char **hostname, size_t maxnamlen,
1487 char **export_path, size_t maxpathlen)
1490 char *colon, *comma;
1492 colon = strchr(dev_name, ':');
1494 goto out_bad_devname;
1496 len = colon - dev_name;
1497 if (len > maxnamlen)
1500 /* N.B. caller will free nfs_server.hostname in all cases */
1501 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1505 /* kill possible hostname list: not supported */
1506 comma = strchr(*hostname, ',');
1507 if (comma != NULL) {
1508 if (comma == *hostname)
1509 goto out_bad_devname;
1514 len = strlen(colon);
1515 if (len > maxpathlen)
1517 *export_path = kstrndup(colon, len, GFP_KERNEL);
1521 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1525 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1529 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1533 dfprintk(MOUNT, "NFS: server hostname too long\n");
1534 return -ENAMETOOLONG;
1537 dfprintk(MOUNT, "NFS: export pathname too long\n");
1538 return -ENAMETOOLONG;
1542 * Hostname has square brackets around it because it contains one or
1543 * more colons. We look for the first closing square bracket, and a
1544 * colon must follow it.
1546 static int nfs_parse_protected_hostname(const char *dev_name,
1547 char **hostname, size_t maxnamlen,
1548 char **export_path, size_t maxpathlen)
1553 start = (char *)(dev_name + 1);
1555 end = strchr(start, ']');
1557 goto out_bad_devname;
1558 if (*(end + 1) != ':')
1559 goto out_bad_devname;
1562 if (len > maxnamlen)
1565 /* N.B. caller will free nfs_server.hostname in all cases */
1566 *hostname = kstrndup(start, len, GFP_KERNEL);
1567 if (*hostname == NULL)
1572 if (len > maxpathlen)
1574 *export_path = kstrndup(end, len, GFP_KERNEL);
1581 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1585 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1589 dfprintk(MOUNT, "NFS: server hostname too long\n");
1590 return -ENAMETOOLONG;
1593 dfprintk(MOUNT, "NFS: export pathname too long\n");
1594 return -ENAMETOOLONG;
1598 * Split "dev_name" into "hostname:export_path".
1600 * The leftmost colon demarks the split between the server's hostname
1601 * and the export path. If the hostname starts with a left square
1602 * bracket, then it may contain colons.
1604 * Note: caller frees hostname and export path, even on error.
1606 static int nfs_parse_devname(const char *dev_name,
1607 char **hostname, size_t maxnamlen,
1608 char **export_path, size_t maxpathlen)
1610 if (*dev_name == '[')
1611 return nfs_parse_protected_hostname(dev_name,
1612 hostname, maxnamlen,
1613 export_path, maxpathlen);
1615 return nfs_parse_simple_hostname(dev_name,
1616 hostname, maxnamlen,
1617 export_path, maxpathlen);
1621 * Validate the NFS2/NFS3 mount data
1622 * - fills in the mount root filehandle
1624 * For option strings, user space handles the following behaviors:
1626 * + DNS: mapping server host name to IP address ("addr=" option)
1628 * + failure mode: how to behave if a mount request can't be handled
1629 * immediately ("fg/bg" option)
1631 * + retry: how often to retry a mount request ("retry=" option)
1633 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1634 * mountproto=tcp after mountproto=udp, and so on
1636 static int nfs_validate_mount_data(void *options,
1637 struct nfs_parsed_mount_data *args,
1638 struct nfs_fh *mntfh,
1639 const char *dev_name)
1641 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1646 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1647 args->rsize = NFS_MAX_FILE_IO_SIZE;
1648 args->wsize = NFS_MAX_FILE_IO_SIZE;
1649 args->acregmin = NFS_DEF_ACREGMIN;
1650 args->acregmax = NFS_DEF_ACREGMAX;
1651 args->acdirmin = NFS_DEF_ACDIRMIN;
1652 args->acdirmax = NFS_DEF_ACDIRMAX;
1653 args->mount_server.port = 0; /* autobind unless user sets port */
1654 args->nfs_server.port = 0; /* autobind unless user sets port */
1655 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1656 args->auth_flavors[0] = RPC_AUTH_UNIX;
1658 switch (data->version) {
1664 if (data->flags & NFS_MOUNT_VER3)
1666 data->root.size = NFS2_FHSIZE;
1667 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1669 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1672 memset(data->context, 0, sizeof(data->context));
1674 if (data->flags & NFS_MOUNT_VER3) {
1675 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1676 goto out_invalid_fh;
1677 mntfh->size = data->root.size;
1679 mntfh->size = NFS2_FHSIZE;
1682 memcpy(mntfh->data, data->root.data, mntfh->size);
1683 if (mntfh->size < sizeof(mntfh->data))
1684 memset(mntfh->data + mntfh->size, 0,
1685 sizeof(mntfh->data) - mntfh->size);
1688 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1691 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1692 args->rsize = data->rsize;
1693 args->wsize = data->wsize;
1694 args->timeo = data->timeo;
1695 args->retrans = data->retrans;
1696 args->acregmin = data->acregmin;
1697 args->acregmax = data->acregmax;
1698 args->acdirmin = data->acdirmin;
1699 args->acdirmax = data->acdirmax;
1701 memcpy(&args->nfs_server.address, &data->addr,
1702 sizeof(data->addr));
1703 args->nfs_server.addrlen = sizeof(data->addr);
1704 if (!nfs_verify_server_address((struct sockaddr *)
1705 &args->nfs_server.address))
1706 goto out_no_address;
1708 if (!(data->flags & NFS_MOUNT_TCP))
1709 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1710 /* N.B. caller will free nfs_server.hostname in all cases */
1711 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1712 args->namlen = data->namlen;
1713 args->bsize = data->bsize;
1715 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1716 args->auth_flavors[0] = data->pseudoflavor;
1717 if (!args->nfs_server.hostname)
1721 * The legacy version 6 binary mount data from userspace has a
1722 * field used only to transport selinux information into the
1723 * the kernel. To continue to support that functionality we
1724 * have a touch of selinux knowledge here in the NFS code. The
1725 * userspace code converted context=blah to just blah so we are
1726 * converting back to the full string selinux understands.
1728 if (data->context[0]){
1729 #ifdef CONFIG_SECURITY_SELINUX
1731 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1734 strcpy(opts_str, "context=");
1735 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1736 strcat(opts_str, &data->context[0]);
1737 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1750 if (nfs_parse_mount_options((char *)options, args) == 0)
1753 if (!nfs_verify_server_address((struct sockaddr *)
1754 &args->nfs_server.address))
1755 goto out_no_address;
1757 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1758 args->nfs_server.port);
1760 nfs_set_mount_transport_protocol(args);
1762 status = nfs_parse_devname(dev_name,
1763 &args->nfs_server.hostname,
1765 &args->nfs_server.export_path,
1768 status = nfs_try_mount(args, mntfh);
1770 kfree(args->nfs_server.export_path);
1771 args->nfs_server.export_path = NULL;
1780 #ifndef CONFIG_NFS_V3
1781 if (args->flags & NFS_MOUNT_VER3)
1782 goto out_v3_not_compiled;
1783 #endif /* !CONFIG_NFS_V3 */
1788 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1792 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1797 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1800 #ifndef CONFIG_NFS_V3
1801 out_v3_not_compiled:
1802 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1803 return -EPROTONOSUPPORT;
1804 #endif /* !CONFIG_NFS_V3 */
1807 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1811 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1815 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1820 nfs_compare_remount_data(struct nfs_server *nfss,
1821 struct nfs_parsed_mount_data *data)
1823 if (data->flags != nfss->flags ||
1824 data->rsize != nfss->rsize ||
1825 data->wsize != nfss->wsize ||
1826 data->retrans != nfss->client->cl_timeout->to_retries ||
1827 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1828 data->acregmin != nfss->acregmin / HZ ||
1829 data->acregmax != nfss->acregmax / HZ ||
1830 data->acdirmin != nfss->acdirmin / HZ ||
1831 data->acdirmax != nfss->acdirmax / HZ ||
1832 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1833 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1834 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1835 data->nfs_server.addrlen) != 0)
1842 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1845 struct nfs_server *nfss = sb->s_fs_info;
1846 struct nfs_parsed_mount_data *data;
1847 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1848 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1849 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1852 * Userspace mount programs that send binary options generally send
1853 * them populated with default values. We have no way to know which
1854 * ones were explicitly specified. Fall back to legacy behavior and
1855 * just return success.
1857 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1858 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1859 options->version <= 6))))
1862 data = kzalloc(sizeof(*data), GFP_KERNEL);
1867 /* fill out struct with values from existing mount */
1868 data->flags = nfss->flags;
1869 data->rsize = nfss->rsize;
1870 data->wsize = nfss->wsize;
1871 data->retrans = nfss->client->cl_timeout->to_retries;
1872 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1873 data->acregmin = nfss->acregmin / HZ;
1874 data->acregmax = nfss->acregmax / HZ;
1875 data->acdirmin = nfss->acdirmin / HZ;
1876 data->acdirmax = nfss->acdirmax / HZ;
1877 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1878 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1879 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1880 data->nfs_server.addrlen);
1882 /* overwrite those values with any that were specified */
1883 error = nfs_parse_mount_options((char *)options, data);
1887 /* compare new mount options with old ones */
1888 error = nfs_compare_remount_data(nfss, data);
1896 * Initialise the common bits of the superblock
1898 static inline void nfs_initialise_sb(struct super_block *sb)
1900 struct nfs_server *server = NFS_SB(sb);
1902 sb->s_magic = NFS_SUPER_MAGIC;
1904 /* We probably want something more informative here */
1905 snprintf(sb->s_id, sizeof(sb->s_id),
1906 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1908 if (sb->s_blocksize == 0)
1909 sb->s_blocksize = nfs_block_bits(server->wsize,
1910 &sb->s_blocksize_bits);
1912 if (server->flags & NFS_MOUNT_NOAC)
1913 sb->s_flags |= MS_SYNCHRONOUS;
1915 nfs_super_set_maxbytes(sb, server->maxfilesize);
1919 * Finish setting up an NFS2/3 superblock
1921 static void nfs_fill_super(struct super_block *sb,
1922 struct nfs_parsed_mount_data *data)
1924 struct nfs_server *server = NFS_SB(sb);
1926 sb->s_blocksize_bits = 0;
1927 sb->s_blocksize = 0;
1929 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1931 if (server->flags & NFS_MOUNT_VER3) {
1932 /* The VFS shouldn't apply the umask to mode bits. We will do
1933 * so ourselves when necessary.
1935 sb->s_flags |= MS_POSIXACL;
1936 sb->s_time_gran = 1;
1939 sb->s_op = &nfs_sops;
1940 nfs_initialise_sb(sb);
1944 * Finish setting up a cloned NFS2/3 superblock
1946 static void nfs_clone_super(struct super_block *sb,
1947 const struct super_block *old_sb)
1949 struct nfs_server *server = NFS_SB(sb);
1951 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1952 sb->s_blocksize = old_sb->s_blocksize;
1953 sb->s_maxbytes = old_sb->s_maxbytes;
1955 if (server->flags & NFS_MOUNT_VER3) {
1956 /* The VFS shouldn't apply the umask to mode bits. We will do
1957 * so ourselves when necessary.
1959 sb->s_flags |= MS_POSIXACL;
1960 sb->s_time_gran = 1;
1963 sb->s_op = old_sb->s_op;
1964 nfs_initialise_sb(sb);
1967 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1969 const struct nfs_server *a = s->s_fs_info;
1970 const struct rpc_clnt *clnt_a = a->client;
1971 const struct rpc_clnt *clnt_b = b->client;
1973 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1975 if (a->nfs_client != b->nfs_client)
1977 if (a->flags != b->flags)
1979 if (a->wsize != b->wsize)
1981 if (a->rsize != b->rsize)
1983 if (a->acregmin != b->acregmin)
1985 if (a->acregmax != b->acregmax)
1987 if (a->acdirmin != b->acdirmin)
1989 if (a->acdirmax != b->acdirmax)
1991 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1998 struct nfs_sb_mountdata {
1999 struct nfs_server *server;
2003 static int nfs_set_super(struct super_block *s, void *data)
2005 struct nfs_sb_mountdata *sb_mntdata = data;
2006 struct nfs_server *server = sb_mntdata->server;
2009 s->s_flags = sb_mntdata->mntflags;
2010 s->s_fs_info = server;
2011 ret = set_anon_super(s, server);
2013 server->s_dev = s->s_dev;
2017 static int nfs_compare_super_address(struct nfs_server *server1,
2018 struct nfs_server *server2)
2020 struct sockaddr *sap1, *sap2;
2022 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2023 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2025 if (sap1->sa_family != sap2->sa_family)
2028 switch (sap1->sa_family) {
2030 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2031 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2032 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2034 if (sin1->sin_port != sin2->sin_port)
2039 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2040 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2041 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2043 if (sin1->sin6_port != sin2->sin6_port)
2054 static int nfs_compare_super(struct super_block *sb, void *data)
2056 struct nfs_sb_mountdata *sb_mntdata = data;
2057 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2058 int mntflags = sb_mntdata->mntflags;
2060 if (!nfs_compare_super_address(old, server))
2062 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2063 if (old->flags & NFS_MOUNT_UNSHARED)
2065 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2067 return nfs_compare_mount_options(sb, server, mntflags);
2070 static int nfs_bdi_register(struct nfs_server *server)
2072 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2075 static int nfs_get_sb(struct file_system_type *fs_type,
2076 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2078 struct nfs_server *server = NULL;
2079 struct super_block *s;
2080 struct nfs_parsed_mount_data *data;
2081 struct nfs_fh *mntfh;
2082 struct dentry *mntroot;
2083 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2084 struct nfs_sb_mountdata sb_mntdata = {
2087 int error = -ENOMEM;
2089 data = kzalloc(sizeof(*data), GFP_KERNEL);
2090 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2091 if (data == NULL || mntfh == NULL)
2094 security_init_mnt_opts(&data->lsm_opts);
2096 /* Validate the mount data */
2097 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2101 /* Get a volume representation */
2102 server = nfs_create_server(data, mntfh);
2103 if (IS_ERR(server)) {
2104 error = PTR_ERR(server);
2107 sb_mntdata.server = server;
2109 if (server->flags & NFS_MOUNT_UNSHARED)
2110 compare_super = NULL;
2112 /* Get a superblock - note that we may end up sharing one that already exists */
2113 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2119 if (s->s_fs_info != server) {
2120 nfs_free_server(server);
2123 error = nfs_bdi_register(server);
2125 goto error_splat_super;
2129 /* initial superblock/root creation */
2130 nfs_fill_super(s, data);
2131 nfs_fscache_get_super_cookie(s, data);
2134 mntroot = nfs_get_root(s, mntfh);
2135 if (IS_ERR(mntroot)) {
2136 error = PTR_ERR(mntroot);
2137 goto error_splat_super;
2140 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2142 goto error_splat_root;
2144 s->s_flags |= MS_ACTIVE;
2146 mnt->mnt_root = mntroot;
2150 kfree(data->nfs_server.hostname);
2151 kfree(data->mount_server.hostname);
2152 kfree(data->fscache_uniq);
2153 security_free_mnt_opts(&data->lsm_opts);
2160 nfs_free_server(server);
2166 deactivate_locked_super(s);
2171 * Destroy an NFS2/3 superblock
2173 static void nfs_kill_super(struct super_block *s)
2175 struct nfs_server *server = NFS_SB(s);
2177 bdi_unregister(&server->backing_dev_info);
2179 nfs_fscache_release_super_cookie(s);
2180 nfs_free_server(server);
2184 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2186 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2187 const char *dev_name, void *raw_data,
2188 struct vfsmount *mnt)
2190 struct nfs_clone_mount *data = raw_data;
2191 struct super_block *s;
2192 struct nfs_server *server;
2193 struct dentry *mntroot;
2194 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2195 struct nfs_sb_mountdata sb_mntdata = {
2200 dprintk("--> nfs_xdev_get_sb()\n");
2202 /* create a new volume representation */
2203 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2204 if (IS_ERR(server)) {
2205 error = PTR_ERR(server);
2206 goto out_err_noserver;
2208 sb_mntdata.server = server;
2210 if (server->flags & NFS_MOUNT_UNSHARED)
2211 compare_super = NULL;
2213 /* Get a superblock - note that we may end up sharing one that already exists */
2214 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2220 if (s->s_fs_info != server) {
2221 nfs_free_server(server);
2224 error = nfs_bdi_register(server);
2226 goto error_splat_super;
2230 /* initial superblock/root creation */
2231 nfs_clone_super(s, data->sb);
2234 mntroot = nfs_get_root(s, data->fh);
2235 if (IS_ERR(mntroot)) {
2236 error = PTR_ERR(mntroot);
2237 goto error_splat_super;
2239 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2242 goto error_splat_super;
2245 s->s_flags |= MS_ACTIVE;
2247 mnt->mnt_root = mntroot;
2249 /* clone any lsm security options from the parent to the new sb */
2250 security_sb_clone_mnt_opts(data->sb, s);
2252 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2256 nfs_free_server(server);
2258 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2262 deactivate_locked_super(s);
2263 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2267 #ifdef CONFIG_NFS_V4
2270 * Finish setting up a cloned NFS4 superblock
2272 static void nfs4_clone_super(struct super_block *sb,
2273 const struct super_block *old_sb)
2275 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2276 sb->s_blocksize = old_sb->s_blocksize;
2277 sb->s_maxbytes = old_sb->s_maxbytes;
2278 sb->s_time_gran = 1;
2279 sb->s_op = old_sb->s_op;
2280 nfs_initialise_sb(sb);
2284 * Set up an NFS4 superblock
2286 static void nfs4_fill_super(struct super_block *sb)
2288 sb->s_time_gran = 1;
2289 sb->s_op = &nfs4_sops;
2290 nfs_initialise_sb(sb);
2293 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2295 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2299 * Validate NFSv4 mount options
2301 static int nfs4_validate_mount_data(void *options,
2302 struct nfs_parsed_mount_data *args,
2303 const char *dev_name)
2305 struct sockaddr_in *ap;
2306 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2312 args->rsize = NFS_MAX_FILE_IO_SIZE;
2313 args->wsize = NFS_MAX_FILE_IO_SIZE;
2314 args->acregmin = NFS_DEF_ACREGMIN;
2315 args->acregmax = NFS_DEF_ACREGMAX;
2316 args->acdirmin = NFS_DEF_ACDIRMIN;
2317 args->acdirmax = NFS_DEF_ACDIRMAX;
2318 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2319 args->auth_flavors[0] = RPC_AUTH_UNIX;
2320 args->auth_flavor_len = 0;
2321 args->minorversion = 0;
2323 switch (data->version) {
2325 ap = (struct sockaddr_in *)&args->nfs_server.address;
2326 if (data->host_addrlen > sizeof(args->nfs_server.address))
2327 goto out_no_address;
2328 if (data->host_addrlen == 0)
2329 goto out_no_address;
2330 args->nfs_server.addrlen = data->host_addrlen;
2331 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2333 if (!nfs_verify_server_address((struct sockaddr *)
2334 &args->nfs_server.address))
2335 goto out_no_address;
2337 if (data->auth_flavourlen) {
2338 if (data->auth_flavourlen > 1)
2339 goto out_inval_auth;
2340 if (copy_from_user(&args->auth_flavors[0],
2341 data->auth_flavours,
2342 sizeof(args->auth_flavors[0])))
2346 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2349 args->nfs_server.hostname = c;
2351 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2354 args->nfs_server.export_path = c;
2355 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2357 c = strndup_user(data->client_addr.data, 16);
2360 args->client_address = c;
2363 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2367 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2368 args->rsize = data->rsize;
2369 args->wsize = data->wsize;
2370 args->timeo = data->timeo;
2371 args->retrans = data->retrans;
2372 args->acregmin = data->acregmin;
2373 args->acregmax = data->acregmax;
2374 args->acdirmin = data->acdirmin;
2375 args->acdirmax = data->acdirmax;
2376 args->nfs_server.protocol = data->proto;
2377 nfs_validate_transport_protocol(args);
2383 if (nfs_parse_mount_options((char *)options, args) == 0)
2386 if (!nfs_verify_server_address((struct sockaddr *)
2387 &args->nfs_server.address))
2390 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2391 args->nfs_server.port);
2393 nfs_validate_transport_protocol(args);
2395 nfs4_validate_mount_flags(args);
2397 if (args->auth_flavor_len > 1)
2398 goto out_inval_auth;
2400 if (args->client_address == NULL)
2401 goto out_no_client_address;
2403 status = nfs_parse_devname(dev_name,
2404 &args->nfs_server.hostname,
2406 &args->nfs_server.export_path,
2418 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2422 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2423 data->auth_flavourlen);
2427 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2430 out_no_client_address:
2431 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2436 * Get the superblock for an NFS4 mountpoint
2438 static int nfs4_get_sb(struct file_system_type *fs_type,
2439 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2441 struct nfs_parsed_mount_data *data;
2442 struct super_block *s;
2443 struct nfs_server *server;
2444 struct nfs_fh *mntfh;
2445 struct dentry *mntroot;
2446 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2447 struct nfs_sb_mountdata sb_mntdata = {
2450 int error = -ENOMEM;
2452 data = kzalloc(sizeof(*data), GFP_KERNEL);
2453 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2454 if (data == NULL || mntfh == NULL)
2457 security_init_mnt_opts(&data->lsm_opts);
2459 /* Validate the mount data */
2460 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2464 /* Get a volume representation */
2465 server = nfs4_create_server(data, mntfh);
2466 if (IS_ERR(server)) {
2467 error = PTR_ERR(server);
2470 sb_mntdata.server = server;
2472 if (server->flags & NFS4_MOUNT_UNSHARED)
2473 compare_super = NULL;
2475 /* Get a superblock - note that we may end up sharing one that already exists */
2476 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2482 if (s->s_fs_info != server) {
2483 nfs_free_server(server);
2486 error = nfs_bdi_register(server);
2488 goto error_splat_super;
2492 /* initial superblock/root creation */
2494 nfs_fscache_get_super_cookie(s, data);
2497 mntroot = nfs4_get_root(s, mntfh);
2498 if (IS_ERR(mntroot)) {
2499 error = PTR_ERR(mntroot);
2500 goto error_splat_super;
2503 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2505 goto error_splat_root;
2507 s->s_flags |= MS_ACTIVE;
2509 mnt->mnt_root = mntroot;
2513 kfree(data->client_address);
2514 kfree(data->nfs_server.export_path);
2515 kfree(data->nfs_server.hostname);
2516 kfree(data->fscache_uniq);
2517 security_free_mnt_opts(&data->lsm_opts);
2524 nfs_free_server(server);
2530 deactivate_locked_super(s);
2534 static void nfs4_kill_super(struct super_block *sb)
2536 struct nfs_server *server = NFS_SB(sb);
2538 dprintk("--> %s\n", __func__);
2539 nfs_super_return_all_delegations(sb);
2540 kill_anon_super(sb);
2541 nfs4_renewd_prepare_shutdown(server);
2542 nfs_fscache_release_super_cookie(sb);
2543 nfs_free_server(server);
2544 dprintk("<-- %s\n", __func__);
2548 * Clone an NFS4 server record on xdev traversal (FSID-change)
2550 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2551 const char *dev_name, void *raw_data,
2552 struct vfsmount *mnt)
2554 struct nfs_clone_mount *data = raw_data;
2555 struct super_block *s;
2556 struct nfs_server *server;
2557 struct dentry *mntroot;
2558 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2559 struct nfs_sb_mountdata sb_mntdata = {
2564 dprintk("--> nfs4_xdev_get_sb()\n");
2566 /* create a new volume representation */
2567 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2568 if (IS_ERR(server)) {
2569 error = PTR_ERR(server);
2570 goto out_err_noserver;
2572 sb_mntdata.server = server;
2574 if (server->flags & NFS4_MOUNT_UNSHARED)
2575 compare_super = NULL;
2577 /* Get a superblock - note that we may end up sharing one that already exists */
2578 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2584 if (s->s_fs_info != server) {
2585 nfs_free_server(server);
2588 error = nfs_bdi_register(server);
2590 goto error_splat_super;
2594 /* initial superblock/root creation */
2595 nfs4_clone_super(s, data->sb);
2598 mntroot = nfs4_get_root(s, data->fh);
2599 if (IS_ERR(mntroot)) {
2600 error = PTR_ERR(mntroot);
2601 goto error_splat_super;
2603 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2606 goto error_splat_super;
2609 s->s_flags |= MS_ACTIVE;
2611 mnt->mnt_root = mntroot;
2613 security_sb_clone_mnt_opts(data->sb, s);
2615 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2619 nfs_free_server(server);
2621 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2625 deactivate_locked_super(s);
2626 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2631 * Create an NFS4 server record on referral traversal
2633 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2634 const char *dev_name, void *raw_data,
2635 struct vfsmount *mnt)
2637 struct nfs_clone_mount *data = raw_data;
2638 struct super_block *s;
2639 struct nfs_server *server;
2640 struct dentry *mntroot;
2641 struct nfs_fh mntfh;
2642 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2643 struct nfs_sb_mountdata sb_mntdata = {
2648 dprintk("--> nfs4_referral_get_sb()\n");
2650 /* create a new volume representation */
2651 server = nfs4_create_referral_server(data, &mntfh);
2652 if (IS_ERR(server)) {
2653 error = PTR_ERR(server);
2654 goto out_err_noserver;
2656 sb_mntdata.server = server;
2658 if (server->flags & NFS4_MOUNT_UNSHARED)
2659 compare_super = NULL;
2661 /* Get a superblock - note that we may end up sharing one that already exists */
2662 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2668 if (s->s_fs_info != server) {
2669 nfs_free_server(server);
2672 error = nfs_bdi_register(server);
2674 goto error_splat_super;
2678 /* initial superblock/root creation */
2682 mntroot = nfs4_get_root(s, &mntfh);
2683 if (IS_ERR(mntroot)) {
2684 error = PTR_ERR(mntroot);
2685 goto error_splat_super;
2687 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2690 goto error_splat_super;
2693 s->s_flags |= MS_ACTIVE;
2695 mnt->mnt_root = mntroot;
2697 security_sb_clone_mnt_opts(data->sb, s);
2699 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2703 nfs_free_server(server);
2705 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2709 deactivate_locked_super(s);
2710 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2714 #endif /* CONFIG_NFS_V4 */