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=%u" },
144 { Opt_rsize, "rsize=%u" },
145 { Opt_wsize, "wsize=%u" },
146 { Opt_bsize, "bsize=%u" },
147 { Opt_timeo, "timeo=%u" },
148 { Opt_retrans, "retrans=%u" },
149 { Opt_acregmin, "acregmin=%u" },
150 { Opt_acregmax, "acregmax=%u" },
151 { Opt_acdirmin, "acdirmin=%u" },
152 { Opt_acdirmax, "acdirmax=%u" },
153 { Opt_actimeo, "actimeo=%u" },
154 { Opt_namelen, "namlen=%u" },
155 { Opt_mountport, "mountport=%u" },
156 { Opt_mountvers, "mountvers=%u" },
157 { Opt_nfsvers, "nfsvers=%u" },
158 { Opt_nfsvers, "vers=%u" },
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_INTR, ",intr", ",nointr" },
520 { NFS_MOUNT_POSIX, ",posix", "" },
521 { NFS_MOUNT_NOCTO, ",nocto", "" },
522 { NFS_MOUNT_NOAC, ",noac", "" },
523 { NFS_MOUNT_NONLM, ",nolock", "" },
524 { NFS_MOUNT_NOACL, ",noacl", "" },
525 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
526 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
527 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
530 const struct proc_nfs_info *nfs_infop;
531 struct nfs_client *clp = nfss->nfs_client;
532 u32 version = clp->rpc_ops->version;
534 seq_printf(m, ",vers=%u", version);
535 seq_printf(m, ",rsize=%u", nfss->rsize);
536 seq_printf(m, ",wsize=%u", nfss->wsize);
537 if (nfss->bsize != 0)
538 seq_printf(m, ",bsize=%u", nfss->bsize);
539 seq_printf(m, ",namlen=%u", nfss->namelen);
540 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
541 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
542 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
543 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
544 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
545 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
546 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
547 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
548 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
549 if (nfss->flags & nfs_infop->flag)
550 seq_puts(m, nfs_infop->str);
552 seq_puts(m, nfs_infop->nostr);
554 seq_printf(m, ",proto=%s",
555 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
557 if (nfss->port != NFS_PORT)
558 seq_printf(m, ",port=%u", nfss->port);
561 seq_printf(m, ",port=%u", nfss->port);
563 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
564 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
565 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
568 nfs_show_mountd_options(m, nfss, showdefaults);
571 if (clp->rpc_ops->version == 4)
572 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
574 if (nfss->options & NFS_OPTION_FSCACHE)
575 seq_printf(m, ",fsc");
579 * Describe the mount options on this VFS mountpoint
581 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
583 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
585 nfs_show_mount_options(m, nfss, 0);
587 seq_printf(m, ",addr=%s",
588 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
595 * Present statistical information for this VFS mountpoint
597 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
600 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
601 struct rpc_auth *auth = nfss->client->cl_auth;
602 struct nfs_iostats totals = { };
604 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
607 * Display all mount option settings
609 seq_printf(m, "\n\topts:\t");
610 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
611 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
612 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
613 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
614 nfs_show_mount_options(m, nfss, 1);
616 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
618 seq_printf(m, "\n\tcaps:\t");
619 seq_printf(m, "caps=0x%x", nfss->caps);
620 seq_printf(m, ",wtmult=%u", nfss->wtmult);
621 seq_printf(m, ",dtsize=%u", nfss->dtsize);
622 seq_printf(m, ",bsize=%u", nfss->bsize);
623 seq_printf(m, ",namlen=%u", nfss->namelen);
626 if (nfss->nfs_client->rpc_ops->version == 4) {
627 seq_printf(m, "\n\tnfsv4:\t");
628 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
629 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
630 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
635 * Display security flavor in effect for this mount
637 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
639 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
642 * Display superblock I/O counters
644 for_each_possible_cpu(cpu) {
645 struct nfs_iostats *stats;
648 stats = per_cpu_ptr(nfss->io_stats, cpu);
650 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
651 totals.events[i] += stats->events[i];
652 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
653 totals.bytes[i] += stats->bytes[i];
654 #ifdef CONFIG_NFS_FSCACHE
655 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
656 totals.fscache[i] += stats->fscache[i];
662 seq_printf(m, "\n\tevents:\t");
663 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
664 seq_printf(m, "%lu ", totals.events[i]);
665 seq_printf(m, "\n\tbytes:\t");
666 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
667 seq_printf(m, "%Lu ", totals.bytes[i]);
668 #ifdef CONFIG_NFS_FSCACHE
669 if (nfss->options & NFS_OPTION_FSCACHE) {
670 seq_printf(m, "\n\tfsc:\t");
671 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
672 seq_printf(m, "%Lu ", totals.bytes[i]);
677 rpc_print_iostats(m, nfss->client);
683 * Begin unmount by attempting to remove all automounted mountpoints we added
684 * in response to xdev traversals and referrals
686 static void nfs_umount_begin(struct super_block *sb)
688 struct nfs_server *server;
689 struct rpc_clnt *rpc;
694 /* -EIO all pending I/O */
695 rpc = server->client_acl;
697 rpc_killall_tasks(rpc);
698 rpc = server->client;
700 rpc_killall_tasks(rpc);
706 * Sanity-check a server address provided by the mount command.
708 * Address family must be initialized, and address must not be
709 * the ANY address for that family.
711 static int nfs_verify_server_address(struct sockaddr *addr)
713 switch (addr->sa_family) {
715 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
716 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
719 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
720 return !ipv6_addr_any(sa);
727 static void nfs_parse_ipv4_address(char *string, size_t str_len,
728 struct sockaddr *sap, size_t *addr_len)
730 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
731 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
733 if (str_len <= INET_ADDRSTRLEN) {
734 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
735 (int)str_len, string);
737 sin->sin_family = AF_INET;
738 *addr_len = sizeof(*sin);
739 if (in4_pton(string, str_len, addr, '\0', NULL))
743 sap->sa_family = AF_UNSPEC;
747 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
748 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
750 struct sockaddr_in6 *sin6)
755 if ((string + str_len) == delim)
758 if (*delim != IPV6_SCOPE_DELIMITER)
761 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
764 len = (string + str_len) - delim - 1;
765 p = kstrndup(delim + 1, len, GFP_KERNEL);
767 unsigned long scope_id = 0;
768 struct net_device *dev;
770 dev = dev_get_by_name(&init_net, p);
772 scope_id = dev->ifindex;
775 if (strict_strtoul(p, 10, &scope_id) == 0) {
783 sin6->sin6_scope_id = scope_id;
784 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
791 static void nfs_parse_ipv6_address(char *string, size_t str_len,
792 struct sockaddr *sap, size_t *addr_len)
794 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
795 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
798 if (str_len <= INET6_ADDRSTRLEN) {
799 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
800 (int)str_len, string);
802 sin6->sin6_family = AF_INET6;
803 *addr_len = sizeof(*sin6);
804 if (in6_pton(string, str_len, addr,
805 IPV6_SCOPE_DELIMITER, &delim) != 0) {
806 if (nfs_parse_ipv6_scope_id(string, str_len,
812 sap->sa_family = AF_UNSPEC;
816 static void nfs_parse_ipv6_address(char *string, size_t str_len,
817 struct sockaddr *sap, size_t *addr_len)
819 sap->sa_family = AF_UNSPEC;
825 * Construct a sockaddr based on the contents of a string that contains
826 * an IP address in presentation format.
828 * If there is a problem constructing the new sockaddr, set the address
829 * family to AF_UNSPEC.
831 void nfs_parse_ip_address(char *string, size_t str_len,
832 struct sockaddr *sap, size_t *addr_len)
834 unsigned int i, colons;
837 for (i = 0; i < str_len; i++)
838 if (string[i] == ':')
842 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
844 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
848 * Sanity check the NFS transport protocol.
851 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
853 switch (mnt->nfs_server.protocol) {
854 case XPRT_TRANSPORT_UDP:
855 case XPRT_TRANSPORT_TCP:
856 case XPRT_TRANSPORT_RDMA:
859 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
864 * For text based NFSv2/v3 mounts, the mount protocol transport default
865 * settings should depend upon the specified NFS transport.
867 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
869 nfs_validate_transport_protocol(mnt);
871 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
872 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
874 switch (mnt->nfs_server.protocol) {
875 case XPRT_TRANSPORT_UDP:
876 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
878 case XPRT_TRANSPORT_TCP:
879 case XPRT_TRANSPORT_RDMA:
880 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
885 * Parse the value of the 'sec=' option.
887 * The flavor_len setting is for v4 mounts.
889 static int nfs_parse_security_flavors(char *value,
890 struct nfs_parsed_mount_data *mnt)
892 substring_t args[MAX_OPT_ARGS];
894 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
896 switch (match_token(value, nfs_secflavor_tokens, args)) {
898 mnt->auth_flavor_len = 0;
899 mnt->auth_flavors[0] = RPC_AUTH_NULL;
902 mnt->auth_flavor_len = 0;
903 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
906 mnt->auth_flavor_len = 1;
907 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
910 mnt->auth_flavor_len = 1;
911 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
914 mnt->auth_flavor_len = 1;
915 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
918 mnt->auth_flavor_len = 1;
919 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
922 mnt->auth_flavor_len = 1;
923 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
926 mnt->auth_flavor_len = 1;
927 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
930 mnt->auth_flavor_len = 1;
931 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
934 mnt->auth_flavor_len = 1;
935 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
938 mnt->auth_flavor_len = 1;
939 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
948 static void nfs_parse_invalid_value(const char *option)
950 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
954 * Error-check and convert a string of mount options from user space into
955 * a data structure. The whole mount string is processed; bad options are
956 * skipped as they are encountered. If there were no errors, return 1;
957 * otherwise return 0 (zero).
959 static int nfs_parse_mount_options(char *raw,
960 struct nfs_parsed_mount_data *mnt)
962 char *p, *string, *secdata;
963 int rc, sloppy = 0, errors = 0;
966 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
969 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
971 secdata = alloc_secdata();
975 rc = security_sb_copy_data(raw, secdata);
977 goto out_security_failure;
979 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
981 goto out_security_failure;
983 free_secdata(secdata);
985 while ((p = strsep(&raw, ",")) != NULL) {
986 substring_t args[MAX_OPT_ARGS];
992 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
994 token = match_token(p, nfs_mount_option_tokens, args);
998 * boolean options: foo/nofoo
1001 mnt->flags |= NFS_MOUNT_SOFT;
1004 mnt->flags &= ~NFS_MOUNT_SOFT;
1007 mnt->flags |= NFS_MOUNT_POSIX;
1010 mnt->flags &= ~NFS_MOUNT_POSIX;
1013 mnt->flags &= ~NFS_MOUNT_NOCTO;
1016 mnt->flags |= NFS_MOUNT_NOCTO;
1019 mnt->flags &= ~NFS_MOUNT_NOAC;
1022 mnt->flags |= NFS_MOUNT_NOAC;
1025 mnt->flags &= ~NFS_MOUNT_NONLM;
1028 mnt->flags |= NFS_MOUNT_NONLM;
1031 mnt->flags &= ~NFS_MOUNT_VER3;
1034 mnt->flags |= NFS_MOUNT_VER3;
1037 mnt->flags &= ~NFS_MOUNT_TCP;
1038 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1041 mnt->flags |= NFS_MOUNT_TCP;
1042 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1045 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1046 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1047 xprt_load_transport(p);
1050 mnt->flags &= ~NFS_MOUNT_NOACL;
1053 mnt->flags |= NFS_MOUNT_NOACL;
1056 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1058 case Opt_nordirplus:
1059 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1061 case Opt_sharecache:
1062 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1064 case Opt_nosharecache:
1065 mnt->flags |= NFS_MOUNT_UNSHARED;
1068 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1070 case Opt_noresvport:
1071 mnt->flags |= NFS_MOUNT_NORESVPORT;
1074 mnt->options |= NFS_OPTION_FSCACHE;
1075 kfree(mnt->fscache_uniq);
1076 mnt->fscache_uniq = NULL;
1079 mnt->options &= ~NFS_OPTION_FSCACHE;
1080 kfree(mnt->fscache_uniq);
1081 mnt->fscache_uniq = NULL;
1083 case Opt_fscache_uniq:
1084 string = match_strdup(args);
1087 kfree(mnt->fscache_uniq);
1088 mnt->fscache_uniq = string;
1089 mnt->options |= NFS_OPTION_FSCACHE;
1093 * options that take numeric values
1096 if (match_int(args, &option) ||
1097 option < 0 || option > USHORT_MAX) {
1099 nfs_parse_invalid_value("port");
1101 mnt->nfs_server.port = option;
1104 if (match_int(args, &option) || option < 0) {
1106 nfs_parse_invalid_value("rsize");
1108 mnt->rsize = option;
1111 if (match_int(args, &option) || option < 0) {
1113 nfs_parse_invalid_value("wsize");
1115 mnt->wsize = option;
1118 if (match_int(args, &option) || option < 0) {
1120 nfs_parse_invalid_value("bsize");
1122 mnt->bsize = option;
1125 if (match_int(args, &option) || option <= 0) {
1127 nfs_parse_invalid_value("timeo");
1129 mnt->timeo = option;
1132 if (match_int(args, &option) || option <= 0) {
1134 nfs_parse_invalid_value("retrans");
1136 mnt->retrans = option;
1139 if (match_int(args, &option) || option < 0) {
1141 nfs_parse_invalid_value("acregmin");
1143 mnt->acregmin = option;
1146 if (match_int(args, &option) || option < 0) {
1148 nfs_parse_invalid_value("acregmax");
1150 mnt->acregmax = option;
1153 if (match_int(args, &option) || option < 0) {
1155 nfs_parse_invalid_value("acdirmin");
1157 mnt->acdirmin = option;
1160 if (match_int(args, &option) || option < 0) {
1162 nfs_parse_invalid_value("acdirmax");
1164 mnt->acdirmax = option;
1167 if (match_int(args, &option) || option < 0) {
1169 nfs_parse_invalid_value("actimeo");
1171 mnt->acregmin = mnt->acregmax =
1172 mnt->acdirmin = mnt->acdirmax = option;
1175 if (match_int(args, &option) || option < 0) {
1177 nfs_parse_invalid_value("namlen");
1179 mnt->namlen = option;
1182 if (match_int(args, &option) ||
1183 option < 0 || option > USHORT_MAX) {
1185 nfs_parse_invalid_value("mountport");
1187 mnt->mount_server.port = option;
1190 if (match_int(args, &option) ||
1191 option < NFS_MNT_VERSION ||
1192 option > NFS_MNT3_VERSION) {
1194 nfs_parse_invalid_value("mountvers");
1196 mnt->mount_server.version = option;
1199 if (match_int(args, &option)) {
1201 nfs_parse_invalid_value("nfsvers");
1206 mnt->flags &= ~NFS_MOUNT_VER3;
1209 mnt->flags |= NFS_MOUNT_VER3;
1213 nfs_parse_invalid_value("nfsvers");
1216 case Opt_minorversion:
1217 if (match_int(args, &option))
1219 if (option < 0 || option > NFS4_MAX_MINOR_VERSION)
1221 mnt->minorversion = option;
1225 * options that take text values
1228 string = match_strdup(args);
1231 rc = nfs_parse_security_flavors(string, mnt);
1235 dfprintk(MOUNT, "NFS: unrecognized "
1236 "security flavor\n");
1240 string = match_strdup(args);
1243 token = match_token(string,
1244 nfs_xprt_protocol_tokens, args);
1248 mnt->flags &= ~NFS_MOUNT_TCP;
1249 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1252 mnt->flags |= NFS_MOUNT_TCP;
1253 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1256 /* vector side protocols to TCP */
1257 mnt->flags |= NFS_MOUNT_TCP;
1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1259 xprt_load_transport(string);
1263 dfprintk(MOUNT, "NFS: unrecognized "
1264 "transport protocol\n");
1268 case Opt_mountproto:
1269 string = match_strdup(args);
1272 token = match_token(string,
1273 nfs_xprt_protocol_tokens, args);
1278 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1281 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1283 case Opt_xprt_rdma: /* not used for side protocols */
1286 dfprintk(MOUNT, "NFS: unrecognized "
1287 "transport protocol\n");
1291 string = match_strdup(args);
1294 nfs_parse_ip_address(string, strlen(string),
1296 &mnt->nfs_server.address,
1297 &mnt->nfs_server.addrlen);
1300 case Opt_clientaddr:
1301 string = match_strdup(args);
1304 kfree(mnt->client_address);
1305 mnt->client_address = string;
1308 string = match_strdup(args);
1311 kfree(mnt->mount_server.hostname);
1312 mnt->mount_server.hostname = string;
1315 string = match_strdup(args);
1318 nfs_parse_ip_address(string, strlen(string),
1320 &mnt->mount_server.address,
1321 &mnt->mount_server.addrlen);
1324 case Opt_lookupcache:
1325 string = match_strdup(args);
1328 token = match_token(string,
1329 nfs_lookupcache_tokens, args);
1332 case Opt_lookupcache_all:
1333 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1335 case Opt_lookupcache_positive:
1336 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1337 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1339 case Opt_lookupcache_none:
1340 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1344 dfprintk(MOUNT, "NFS: invalid "
1345 "lookupcache argument\n");
1354 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1357 case Opt_deprecated:
1358 dfprintk(MOUNT, "NFS: ignoring mount option "
1364 dfprintk(MOUNT, "NFS: unrecognized mount option "
1370 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1371 errors, (errors == 1 ? "" : "s"));
1378 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1380 out_security_failure:
1381 free_secdata(secdata);
1382 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1387 * Use the remote server's MOUNT service to request the NFS file handle
1388 * corresponding to the provided path.
1390 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1391 struct nfs_fh *root_fh)
1393 struct nfs_mount_request request = {
1394 .sap = (struct sockaddr *)
1395 &args->mount_server.address,
1396 .dirpath = args->nfs_server.export_path,
1397 .protocol = args->mount_server.protocol,
1399 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1403 if (args->mount_server.version == 0) {
1404 if (args->flags & NFS_MOUNT_VER3)
1405 args->mount_server.version = NFS_MNT3_VERSION;
1407 args->mount_server.version = NFS_MNT_VERSION;
1409 request.version = args->mount_server.version;
1411 if (args->mount_server.hostname)
1412 request.hostname = args->mount_server.hostname;
1414 request.hostname = args->nfs_server.hostname;
1417 * Construct the mount server's address.
1419 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1420 memcpy(request.sap, &args->nfs_server.address,
1421 args->nfs_server.addrlen);
1422 args->mount_server.addrlen = args->nfs_server.addrlen;
1424 request.salen = args->mount_server.addrlen;
1427 * autobind will be used if mount_server.port == 0
1429 nfs_set_port(request.sap, args->mount_server.port);
1432 * Now ask the mount server to map our export path
1435 status = nfs_mount(&request);
1439 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1440 request.hostname, status);
1444 static int nfs_parse_simple_hostname(const char *dev_name,
1445 char **hostname, size_t maxnamlen,
1446 char **export_path, size_t maxpathlen)
1449 char *colon, *comma;
1451 colon = strchr(dev_name, ':');
1453 goto out_bad_devname;
1455 len = colon - dev_name;
1456 if (len > maxnamlen)
1459 /* N.B. caller will free nfs_server.hostname in all cases */
1460 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1464 /* kill possible hostname list: not supported */
1465 comma = strchr(*hostname, ',');
1466 if (comma != NULL) {
1467 if (comma == *hostname)
1468 goto out_bad_devname;
1473 len = strlen(colon);
1474 if (len > maxpathlen)
1476 *export_path = kstrndup(colon, len, GFP_KERNEL);
1480 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1484 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1488 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1492 dfprintk(MOUNT, "NFS: server hostname too long\n");
1493 return -ENAMETOOLONG;
1496 dfprintk(MOUNT, "NFS: export pathname too long\n");
1497 return -ENAMETOOLONG;
1501 * Hostname has square brackets around it because it contains one or
1502 * more colons. We look for the first closing square bracket, and a
1503 * colon must follow it.
1505 static int nfs_parse_protected_hostname(const char *dev_name,
1506 char **hostname, size_t maxnamlen,
1507 char **export_path, size_t maxpathlen)
1512 start = (char *)(dev_name + 1);
1514 end = strchr(start, ']');
1516 goto out_bad_devname;
1517 if (*(end + 1) != ':')
1518 goto out_bad_devname;
1521 if (len > maxnamlen)
1524 /* N.B. caller will free nfs_server.hostname in all cases */
1525 *hostname = kstrndup(start, len, GFP_KERNEL);
1526 if (*hostname == NULL)
1531 if (len > maxpathlen)
1533 *export_path = kstrndup(end, len, GFP_KERNEL);
1540 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1544 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1548 dfprintk(MOUNT, "NFS: server hostname too long\n");
1549 return -ENAMETOOLONG;
1552 dfprintk(MOUNT, "NFS: export pathname too long\n");
1553 return -ENAMETOOLONG;
1557 * Split "dev_name" into "hostname:export_path".
1559 * The leftmost colon demarks the split between the server's hostname
1560 * and the export path. If the hostname starts with a left square
1561 * bracket, then it may contain colons.
1563 * Note: caller frees hostname and export path, even on error.
1565 static int nfs_parse_devname(const char *dev_name,
1566 char **hostname, size_t maxnamlen,
1567 char **export_path, size_t maxpathlen)
1569 if (*dev_name == '[')
1570 return nfs_parse_protected_hostname(dev_name,
1571 hostname, maxnamlen,
1572 export_path, maxpathlen);
1574 return nfs_parse_simple_hostname(dev_name,
1575 hostname, maxnamlen,
1576 export_path, maxpathlen);
1580 * Validate the NFS2/NFS3 mount data
1581 * - fills in the mount root filehandle
1583 * For option strings, user space handles the following behaviors:
1585 * + DNS: mapping server host name to IP address ("addr=" option)
1587 * + failure mode: how to behave if a mount request can't be handled
1588 * immediately ("fg/bg" option)
1590 * + retry: how often to retry a mount request ("retry=" option)
1592 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1593 * mountproto=tcp after mountproto=udp, and so on
1595 static int nfs_validate_mount_data(void *options,
1596 struct nfs_parsed_mount_data *args,
1597 struct nfs_fh *mntfh,
1598 const char *dev_name)
1600 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1605 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1606 args->rsize = NFS_MAX_FILE_IO_SIZE;
1607 args->wsize = NFS_MAX_FILE_IO_SIZE;
1608 args->acregmin = NFS_DEF_ACREGMIN;
1609 args->acregmax = NFS_DEF_ACREGMAX;
1610 args->acdirmin = NFS_DEF_ACDIRMIN;
1611 args->acdirmax = NFS_DEF_ACDIRMAX;
1612 args->mount_server.port = 0; /* autobind unless user sets port */
1613 args->nfs_server.port = 0; /* autobind unless user sets port */
1614 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1615 args->auth_flavors[0] = RPC_AUTH_UNIX;
1617 switch (data->version) {
1623 if (data->flags & NFS_MOUNT_VER3)
1625 data->root.size = NFS2_FHSIZE;
1626 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1628 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1631 memset(data->context, 0, sizeof(data->context));
1633 if (data->flags & NFS_MOUNT_VER3) {
1634 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1635 goto out_invalid_fh;
1636 mntfh->size = data->root.size;
1638 mntfh->size = NFS2_FHSIZE;
1641 memcpy(mntfh->data, data->root.data, mntfh->size);
1642 if (mntfh->size < sizeof(mntfh->data))
1643 memset(mntfh->data + mntfh->size, 0,
1644 sizeof(mntfh->data) - mntfh->size);
1647 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1650 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1651 args->rsize = data->rsize;
1652 args->wsize = data->wsize;
1653 args->timeo = data->timeo;
1654 args->retrans = data->retrans;
1655 args->acregmin = data->acregmin;
1656 args->acregmax = data->acregmax;
1657 args->acdirmin = data->acdirmin;
1658 args->acdirmax = data->acdirmax;
1660 memcpy(&args->nfs_server.address, &data->addr,
1661 sizeof(data->addr));
1662 args->nfs_server.addrlen = sizeof(data->addr);
1663 if (!nfs_verify_server_address((struct sockaddr *)
1664 &args->nfs_server.address))
1665 goto out_no_address;
1667 if (!(data->flags & NFS_MOUNT_TCP))
1668 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1669 /* N.B. caller will free nfs_server.hostname in all cases */
1670 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1671 args->namlen = data->namlen;
1672 args->bsize = data->bsize;
1674 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1675 args->auth_flavors[0] = data->pseudoflavor;
1676 if (!args->nfs_server.hostname)
1680 * The legacy version 6 binary mount data from userspace has a
1681 * field used only to transport selinux information into the
1682 * the kernel. To continue to support that functionality we
1683 * have a touch of selinux knowledge here in the NFS code. The
1684 * userspace code converted context=blah to just blah so we are
1685 * converting back to the full string selinux understands.
1687 if (data->context[0]){
1688 #ifdef CONFIG_SECURITY_SELINUX
1690 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1693 strcpy(opts_str, "context=");
1694 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1695 strcat(opts_str, &data->context[0]);
1696 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1709 if (nfs_parse_mount_options((char *)options, args) == 0)
1712 if (!nfs_verify_server_address((struct sockaddr *)
1713 &args->nfs_server.address))
1714 goto out_no_address;
1716 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1717 args->nfs_server.port);
1719 nfs_set_mount_transport_protocol(args);
1721 status = nfs_parse_devname(dev_name,
1722 &args->nfs_server.hostname,
1724 &args->nfs_server.export_path,
1727 status = nfs_try_mount(args, mntfh);
1729 kfree(args->nfs_server.export_path);
1730 args->nfs_server.export_path = NULL;
1739 #ifndef CONFIG_NFS_V3
1740 if (args->flags & NFS_MOUNT_VER3)
1741 goto out_v3_not_compiled;
1742 #endif /* !CONFIG_NFS_V3 */
1747 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1751 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1756 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1759 #ifndef CONFIG_NFS_V3
1760 out_v3_not_compiled:
1761 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1762 return -EPROTONOSUPPORT;
1763 #endif /* !CONFIG_NFS_V3 */
1766 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1770 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1774 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1779 nfs_compare_remount_data(struct nfs_server *nfss,
1780 struct nfs_parsed_mount_data *data)
1782 if (data->flags != nfss->flags ||
1783 data->rsize != nfss->rsize ||
1784 data->wsize != nfss->wsize ||
1785 data->retrans != nfss->client->cl_timeout->to_retries ||
1786 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1787 data->acregmin != nfss->acregmin / HZ ||
1788 data->acregmax != nfss->acregmax / HZ ||
1789 data->acdirmin != nfss->acdirmin / HZ ||
1790 data->acdirmax != nfss->acdirmax / HZ ||
1791 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1792 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1793 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1794 data->nfs_server.addrlen) != 0)
1801 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1804 struct nfs_server *nfss = sb->s_fs_info;
1805 struct nfs_parsed_mount_data *data;
1806 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1807 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1808 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1811 * Userspace mount programs that send binary options generally send
1812 * them populated with default values. We have no way to know which
1813 * ones were explicitly specified. Fall back to legacy behavior and
1814 * just return success.
1816 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1817 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1818 options->version <= 6))))
1821 data = kzalloc(sizeof(*data), GFP_KERNEL);
1825 /* fill out struct with values from existing mount */
1826 data->flags = nfss->flags;
1827 data->rsize = nfss->rsize;
1828 data->wsize = nfss->wsize;
1829 data->retrans = nfss->client->cl_timeout->to_retries;
1830 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1831 data->acregmin = nfss->acregmin / HZ;
1832 data->acregmax = nfss->acregmax / HZ;
1833 data->acdirmin = nfss->acdirmin / HZ;
1834 data->acdirmax = nfss->acdirmax / HZ;
1835 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1836 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1837 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1838 data->nfs_server.addrlen);
1840 /* overwrite those values with any that were specified */
1841 error = nfs_parse_mount_options((char *)options, data);
1845 /* compare new mount options with old ones */
1846 error = nfs_compare_remount_data(nfss, data);
1853 * Initialise the common bits of the superblock
1855 static inline void nfs_initialise_sb(struct super_block *sb)
1857 struct nfs_server *server = NFS_SB(sb);
1859 sb->s_magic = NFS_SUPER_MAGIC;
1861 /* We probably want something more informative here */
1862 snprintf(sb->s_id, sizeof(sb->s_id),
1863 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1865 if (sb->s_blocksize == 0)
1866 sb->s_blocksize = nfs_block_bits(server->wsize,
1867 &sb->s_blocksize_bits);
1869 if (server->flags & NFS_MOUNT_NOAC)
1870 sb->s_flags |= MS_SYNCHRONOUS;
1872 nfs_super_set_maxbytes(sb, server->maxfilesize);
1876 * Finish setting up an NFS2/3 superblock
1878 static void nfs_fill_super(struct super_block *sb,
1879 struct nfs_parsed_mount_data *data)
1881 struct nfs_server *server = NFS_SB(sb);
1883 sb->s_blocksize_bits = 0;
1884 sb->s_blocksize = 0;
1886 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1888 if (server->flags & NFS_MOUNT_VER3) {
1889 /* The VFS shouldn't apply the umask to mode bits. We will do
1890 * so ourselves when necessary.
1892 sb->s_flags |= MS_POSIXACL;
1893 sb->s_time_gran = 1;
1896 sb->s_op = &nfs_sops;
1897 nfs_initialise_sb(sb);
1901 * Finish setting up a cloned NFS2/3 superblock
1903 static void nfs_clone_super(struct super_block *sb,
1904 const struct super_block *old_sb)
1906 struct nfs_server *server = NFS_SB(sb);
1908 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1909 sb->s_blocksize = old_sb->s_blocksize;
1910 sb->s_maxbytes = old_sb->s_maxbytes;
1912 if (server->flags & NFS_MOUNT_VER3) {
1913 /* The VFS shouldn't apply the umask to mode bits. We will do
1914 * so ourselves when necessary.
1916 sb->s_flags |= MS_POSIXACL;
1917 sb->s_time_gran = 1;
1920 sb->s_op = old_sb->s_op;
1921 nfs_initialise_sb(sb);
1924 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1926 const struct nfs_server *a = s->s_fs_info;
1927 const struct rpc_clnt *clnt_a = a->client;
1928 const struct rpc_clnt *clnt_b = b->client;
1930 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1932 if (a->nfs_client != b->nfs_client)
1934 if (a->flags != b->flags)
1936 if (a->wsize != b->wsize)
1938 if (a->rsize != b->rsize)
1940 if (a->acregmin != b->acregmin)
1942 if (a->acregmax != b->acregmax)
1944 if (a->acdirmin != b->acdirmin)
1946 if (a->acdirmax != b->acdirmax)
1948 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1955 struct nfs_sb_mountdata {
1956 struct nfs_server *server;
1960 static int nfs_set_super(struct super_block *s, void *data)
1962 struct nfs_sb_mountdata *sb_mntdata = data;
1963 struct nfs_server *server = sb_mntdata->server;
1966 s->s_flags = sb_mntdata->mntflags;
1967 s->s_fs_info = server;
1968 ret = set_anon_super(s, server);
1970 server->s_dev = s->s_dev;
1974 static int nfs_compare_super_address(struct nfs_server *server1,
1975 struct nfs_server *server2)
1977 struct sockaddr *sap1, *sap2;
1979 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1980 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1982 if (sap1->sa_family != sap2->sa_family)
1985 switch (sap1->sa_family) {
1987 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1988 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1989 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1991 if (sin1->sin_port != sin2->sin_port)
1996 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1997 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1998 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2000 if (sin1->sin6_port != sin2->sin6_port)
2011 static int nfs_compare_super(struct super_block *sb, void *data)
2013 struct nfs_sb_mountdata *sb_mntdata = data;
2014 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2015 int mntflags = sb_mntdata->mntflags;
2017 if (!nfs_compare_super_address(old, server))
2019 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2020 if (old->flags & NFS_MOUNT_UNSHARED)
2022 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2024 return nfs_compare_mount_options(sb, server, mntflags);
2027 static int nfs_bdi_register(struct nfs_server *server)
2029 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2032 static int nfs_get_sb(struct file_system_type *fs_type,
2033 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2035 struct nfs_server *server = NULL;
2036 struct super_block *s;
2037 struct nfs_parsed_mount_data *data;
2038 struct nfs_fh *mntfh;
2039 struct dentry *mntroot;
2040 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2041 struct nfs_sb_mountdata sb_mntdata = {
2044 int error = -ENOMEM;
2046 data = kzalloc(sizeof(*data), GFP_KERNEL);
2047 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2048 if (data == NULL || mntfh == NULL)
2051 security_init_mnt_opts(&data->lsm_opts);
2053 /* Validate the mount data */
2054 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2058 /* Get a volume representation */
2059 server = nfs_create_server(data, mntfh);
2060 if (IS_ERR(server)) {
2061 error = PTR_ERR(server);
2064 sb_mntdata.server = server;
2066 if (server->flags & NFS_MOUNT_UNSHARED)
2067 compare_super = NULL;
2069 /* Get a superblock - note that we may end up sharing one that already exists */
2070 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2076 if (s->s_fs_info != server) {
2077 nfs_free_server(server);
2080 error = nfs_bdi_register(server);
2082 goto error_splat_super;
2086 /* initial superblock/root creation */
2087 nfs_fill_super(s, data);
2088 nfs_fscache_get_super_cookie(s, data);
2091 mntroot = nfs_get_root(s, mntfh);
2092 if (IS_ERR(mntroot)) {
2093 error = PTR_ERR(mntroot);
2094 goto error_splat_super;
2097 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2099 goto error_splat_root;
2101 s->s_flags |= MS_ACTIVE;
2103 mnt->mnt_root = mntroot;
2107 kfree(data->nfs_server.hostname);
2108 kfree(data->mount_server.hostname);
2109 kfree(data->fscache_uniq);
2110 security_free_mnt_opts(&data->lsm_opts);
2117 nfs_free_server(server);
2123 deactivate_locked_super(s);
2128 * Destroy an NFS2/3 superblock
2130 static void nfs_kill_super(struct super_block *s)
2132 struct nfs_server *server = NFS_SB(s);
2134 bdi_unregister(&server->backing_dev_info);
2136 nfs_fscache_release_super_cookie(s);
2137 nfs_free_server(server);
2141 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2143 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2144 const char *dev_name, void *raw_data,
2145 struct vfsmount *mnt)
2147 struct nfs_clone_mount *data = raw_data;
2148 struct super_block *s;
2149 struct nfs_server *server;
2150 struct dentry *mntroot;
2151 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2152 struct nfs_sb_mountdata sb_mntdata = {
2157 dprintk("--> nfs_xdev_get_sb()\n");
2159 /* create a new volume representation */
2160 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2161 if (IS_ERR(server)) {
2162 error = PTR_ERR(server);
2163 goto out_err_noserver;
2165 sb_mntdata.server = server;
2167 if (server->flags & NFS_MOUNT_UNSHARED)
2168 compare_super = NULL;
2170 /* Get a superblock - note that we may end up sharing one that already exists */
2171 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2177 if (s->s_fs_info != server) {
2178 nfs_free_server(server);
2181 error = nfs_bdi_register(server);
2183 goto error_splat_super;
2187 /* initial superblock/root creation */
2188 nfs_clone_super(s, data->sb);
2191 mntroot = nfs_get_root(s, data->fh);
2192 if (IS_ERR(mntroot)) {
2193 error = PTR_ERR(mntroot);
2194 goto error_splat_super;
2196 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2199 goto error_splat_super;
2202 s->s_flags |= MS_ACTIVE;
2204 mnt->mnt_root = mntroot;
2206 /* clone any lsm security options from the parent to the new sb */
2207 security_sb_clone_mnt_opts(data->sb, s);
2209 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2213 nfs_free_server(server);
2215 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2219 deactivate_locked_super(s);
2220 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2224 #ifdef CONFIG_NFS_V4
2227 * Finish setting up a cloned NFS4 superblock
2229 static void nfs4_clone_super(struct super_block *sb,
2230 const struct super_block *old_sb)
2232 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2233 sb->s_blocksize = old_sb->s_blocksize;
2234 sb->s_maxbytes = old_sb->s_maxbytes;
2235 sb->s_time_gran = 1;
2236 sb->s_op = old_sb->s_op;
2237 nfs_initialise_sb(sb);
2241 * Set up an NFS4 superblock
2243 static void nfs4_fill_super(struct super_block *sb)
2245 sb->s_time_gran = 1;
2246 sb->s_op = &nfs4_sops;
2247 nfs_initialise_sb(sb);
2251 * Validate NFSv4 mount options
2253 static int nfs4_validate_mount_data(void *options,
2254 struct nfs_parsed_mount_data *args,
2255 const char *dev_name)
2257 struct sockaddr_in *ap;
2258 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2264 args->rsize = NFS_MAX_FILE_IO_SIZE;
2265 args->wsize = NFS_MAX_FILE_IO_SIZE;
2266 args->acregmin = NFS_DEF_ACREGMIN;
2267 args->acregmax = NFS_DEF_ACREGMAX;
2268 args->acdirmin = NFS_DEF_ACDIRMIN;
2269 args->acdirmax = NFS_DEF_ACDIRMAX;
2270 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2271 args->auth_flavors[0] = RPC_AUTH_UNIX;
2272 args->auth_flavor_len = 0;
2273 args->minorversion = 0;
2275 switch (data->version) {
2277 ap = (struct sockaddr_in *)&args->nfs_server.address;
2278 if (data->host_addrlen > sizeof(args->nfs_server.address))
2279 goto out_no_address;
2280 if (data->host_addrlen == 0)
2281 goto out_no_address;
2282 args->nfs_server.addrlen = data->host_addrlen;
2283 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2285 if (!nfs_verify_server_address((struct sockaddr *)
2286 &args->nfs_server.address))
2287 goto out_no_address;
2289 if (data->auth_flavourlen) {
2290 if (data->auth_flavourlen > 1)
2291 goto out_inval_auth;
2292 if (copy_from_user(&args->auth_flavors[0],
2293 data->auth_flavours,
2294 sizeof(args->auth_flavors[0])))
2298 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2301 args->nfs_server.hostname = c;
2303 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2306 args->nfs_server.export_path = c;
2307 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2309 c = strndup_user(data->client_addr.data, 16);
2312 args->client_address = c;
2315 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2319 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2320 args->rsize = data->rsize;
2321 args->wsize = data->wsize;
2322 args->timeo = data->timeo;
2323 args->retrans = data->retrans;
2324 args->acregmin = data->acregmin;
2325 args->acregmax = data->acregmax;
2326 args->acdirmin = data->acdirmin;
2327 args->acdirmax = data->acdirmax;
2328 args->nfs_server.protocol = data->proto;
2329 nfs_validate_transport_protocol(args);
2335 if (nfs_parse_mount_options((char *)options, args) == 0)
2338 if (!nfs_verify_server_address((struct sockaddr *)
2339 &args->nfs_server.address))
2342 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2343 args->nfs_server.port);
2345 nfs_validate_transport_protocol(args);
2347 if (args->auth_flavor_len > 1)
2348 goto out_inval_auth;
2350 if (args->client_address == NULL)
2351 goto out_no_client_address;
2353 status = nfs_parse_devname(dev_name,
2354 &args->nfs_server.hostname,
2356 &args->nfs_server.export_path,
2368 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2372 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2373 data->auth_flavourlen);
2377 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2380 out_no_client_address:
2381 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2386 * Get the superblock for an NFS4 mountpoint
2388 static int nfs4_get_sb(struct file_system_type *fs_type,
2389 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2391 struct nfs_parsed_mount_data *data;
2392 struct super_block *s;
2393 struct nfs_server *server;
2394 struct nfs_fh *mntfh;
2395 struct dentry *mntroot;
2396 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2397 struct nfs_sb_mountdata sb_mntdata = {
2400 int error = -ENOMEM;
2402 data = kzalloc(sizeof(*data), GFP_KERNEL);
2403 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2404 if (data == NULL || mntfh == NULL)
2407 security_init_mnt_opts(&data->lsm_opts);
2409 /* Validate the mount data */
2410 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2414 /* Get a volume representation */
2415 server = nfs4_create_server(data, mntfh);
2416 if (IS_ERR(server)) {
2417 error = PTR_ERR(server);
2420 sb_mntdata.server = server;
2422 if (server->flags & NFS4_MOUNT_UNSHARED)
2423 compare_super = NULL;
2425 /* Get a superblock - note that we may end up sharing one that already exists */
2426 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2432 if (s->s_fs_info != server) {
2433 nfs_free_server(server);
2436 error = nfs_bdi_register(server);
2438 goto error_splat_super;
2442 /* initial superblock/root creation */
2444 nfs_fscache_get_super_cookie(s, data);
2447 mntroot = nfs4_get_root(s, mntfh);
2448 if (IS_ERR(mntroot)) {
2449 error = PTR_ERR(mntroot);
2450 goto error_splat_super;
2453 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2455 goto error_splat_root;
2457 s->s_flags |= MS_ACTIVE;
2459 mnt->mnt_root = mntroot;
2463 kfree(data->client_address);
2464 kfree(data->nfs_server.export_path);
2465 kfree(data->nfs_server.hostname);
2466 kfree(data->fscache_uniq);
2467 security_free_mnt_opts(&data->lsm_opts);
2474 nfs_free_server(server);
2480 deactivate_locked_super(s);
2484 static void nfs4_kill_super(struct super_block *sb)
2486 struct nfs_server *server = NFS_SB(sb);
2488 nfs_super_return_all_delegations(sb);
2489 kill_anon_super(sb);
2491 nfs4_renewd_prepare_shutdown(server);
2492 nfs_fscache_release_super_cookie(sb);
2493 nfs_free_server(server);
2497 * Clone an NFS4 server record on xdev traversal (FSID-change)
2499 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2500 const char *dev_name, void *raw_data,
2501 struct vfsmount *mnt)
2503 struct nfs_clone_mount *data = raw_data;
2504 struct super_block *s;
2505 struct nfs_server *server;
2506 struct dentry *mntroot;
2507 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2508 struct nfs_sb_mountdata sb_mntdata = {
2513 dprintk("--> nfs4_xdev_get_sb()\n");
2515 /* create a new volume representation */
2516 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2517 if (IS_ERR(server)) {
2518 error = PTR_ERR(server);
2519 goto out_err_noserver;
2521 sb_mntdata.server = server;
2523 if (server->flags & NFS4_MOUNT_UNSHARED)
2524 compare_super = NULL;
2526 /* Get a superblock - note that we may end up sharing one that already exists */
2527 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2533 if (s->s_fs_info != server) {
2534 nfs_free_server(server);
2537 error = nfs_bdi_register(server);
2539 goto error_splat_super;
2543 /* initial superblock/root creation */
2544 nfs4_clone_super(s, data->sb);
2547 mntroot = nfs4_get_root(s, data->fh);
2548 if (IS_ERR(mntroot)) {
2549 error = PTR_ERR(mntroot);
2550 goto error_splat_super;
2552 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2555 goto error_splat_super;
2558 s->s_flags |= MS_ACTIVE;
2560 mnt->mnt_root = mntroot;
2562 security_sb_clone_mnt_opts(data->sb, s);
2564 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2568 nfs_free_server(server);
2570 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2574 deactivate_locked_super(s);
2575 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2580 * Create an NFS4 server record on referral traversal
2582 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2583 const char *dev_name, void *raw_data,
2584 struct vfsmount *mnt)
2586 struct nfs_clone_mount *data = raw_data;
2587 struct super_block *s;
2588 struct nfs_server *server;
2589 struct dentry *mntroot;
2590 struct nfs_fh mntfh;
2591 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2592 struct nfs_sb_mountdata sb_mntdata = {
2597 dprintk("--> nfs4_referral_get_sb()\n");
2599 /* create a new volume representation */
2600 server = nfs4_create_referral_server(data, &mntfh);
2601 if (IS_ERR(server)) {
2602 error = PTR_ERR(server);
2603 goto out_err_noserver;
2605 sb_mntdata.server = server;
2607 if (server->flags & NFS4_MOUNT_UNSHARED)
2608 compare_super = NULL;
2610 /* Get a superblock - note that we may end up sharing one that already exists */
2611 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2617 if (s->s_fs_info != server) {
2618 nfs_free_server(server);
2621 error = nfs_bdi_register(server);
2623 goto error_splat_super;
2627 /* initial superblock/root creation */
2631 mntroot = nfs4_get_root(s, &mntfh);
2632 if (IS_ERR(mntroot)) {
2633 error = PTR_ERR(mntroot);
2634 goto error_splat_super;
2636 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2639 goto error_splat_super;
2642 s->s_flags |= MS_ACTIVE;
2644 mnt->mnt_root = mntroot;
2646 security_sb_clone_mnt_opts(data->sb, s);
2648 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2652 nfs_free_server(server);
2654 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2658 deactivate_locked_super(s);
2659 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2663 #endif /* CONFIG_NFS_V4 */