4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/nfs_fs.h>
37 #include <linux/nfs_mount.h>
38 #include <linux/nfs4_mount.h>
39 #include <linux/lockd/bind.h>
40 #include <linux/smp_lock.h>
41 #include <linux/seq_file.h>
42 #include <linux/mount.h>
43 #include <linux/nfs_idmap.h>
44 #include <linux/vfs.h>
45 #include <linux/inet.h>
46 #include <linux/nfs_xdr.h>
47 #include <linux/magic.h>
48 #include <linux/parser.h>
50 #include <asm/system.h>
51 #include <asm/uaccess.h>
55 #include "delegation.h"
59 #define NFSDBG_FACILITY NFSDBG_VFS
62 struct nfs_parsed_mount_data {
66 int acregmin, acregmax,
70 unsigned int auth_flavor_len;
71 rpc_authflavor_t auth_flavors[1];
75 struct sockaddr_in address;
83 struct sockaddr_in address;
92 /* Mount options that take no arguments */
95 Opt_posix, Opt_noposix,
102 Opt_rdirplus, Opt_nordirplus,
103 Opt_sharecache, Opt_nosharecache,
105 /* Mount options that take integer arguments */
107 Opt_rsize, Opt_wsize, Opt_bsize,
108 Opt_timeo, Opt_retrans,
109 Opt_acregmin, Opt_acregmax,
110 Opt_acdirmin, Opt_acdirmax,
114 Opt_mountprog, Opt_mountvers,
115 Opt_nfsprog, Opt_nfsvers,
117 /* Mount options that take string arguments */
118 Opt_sec, Opt_proto, Opt_mountproto,
119 Opt_addr, Opt_mounthost, Opt_clientaddr,
121 /* Mount options that are ignored */
122 Opt_userspace, Opt_deprecated,
127 static match_table_t nfs_mount_option_tokens = {
128 { Opt_userspace, "bg" },
129 { Opt_userspace, "fg" },
130 { Opt_soft, "soft" },
131 { Opt_hard, "hard" },
132 { Opt_intr, "intr" },
133 { Opt_nointr, "nointr" },
134 { Opt_posix, "posix" },
135 { Opt_noposix, "noposix" },
137 { Opt_nocto, "nocto" },
139 { Opt_noac, "noac" },
140 { Opt_lock, "lock" },
141 { Opt_nolock, "nolock" },
147 { Opt_noacl, "noacl" },
148 { Opt_rdirplus, "rdirplus" },
149 { Opt_nordirplus, "nordirplus" },
150 { Opt_sharecache, "sharecache" },
151 { Opt_nosharecache, "nosharecache" },
153 { Opt_port, "port=%u" },
154 { Opt_rsize, "rsize=%u" },
155 { Opt_wsize, "wsize=%u" },
156 { Opt_bsize, "bsize=%u" },
157 { Opt_timeo, "timeo=%u" },
158 { Opt_retrans, "retrans=%u" },
159 { Opt_acregmin, "acregmin=%u" },
160 { Opt_acregmax, "acregmax=%u" },
161 { Opt_acdirmin, "acdirmin=%u" },
162 { Opt_acdirmax, "acdirmax=%u" },
163 { Opt_actimeo, "actimeo=%u" },
164 { Opt_userspace, "retry=%u" },
165 { Opt_namelen, "namlen=%u" },
166 { Opt_mountport, "mountport=%u" },
167 { Opt_mountprog, "mountprog=%u" },
168 { Opt_mountvers, "mountvers=%u" },
169 { Opt_nfsprog, "nfsprog=%u" },
170 { Opt_nfsvers, "nfsvers=%u" },
171 { Opt_nfsvers, "vers=%u" },
173 { Opt_sec, "sec=%s" },
174 { Opt_proto, "proto=%s" },
175 { Opt_mountproto, "mountproto=%s" },
176 { Opt_addr, "addr=%s" },
177 { Opt_clientaddr, "clientaddr=%s" },
178 { Opt_mounthost, "mounthost=%s" },
184 Opt_xprt_udp, Opt_xprt_tcp,
189 static match_table_t nfs_xprt_protocol_tokens = {
190 { Opt_xprt_udp, "udp" },
191 { Opt_xprt_tcp, "tcp" },
193 { Opt_xprt_err, NULL }
197 Opt_sec_none, Opt_sec_sys,
198 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
199 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
200 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
205 static match_table_t nfs_secflavor_tokens = {
206 { Opt_sec_none, "none" },
207 { Opt_sec_none, "null" },
208 { Opt_sec_sys, "sys" },
210 { Opt_sec_krb5, "krb5" },
211 { Opt_sec_krb5i, "krb5i" },
212 { Opt_sec_krb5p, "krb5p" },
214 { Opt_sec_lkey, "lkey" },
215 { Opt_sec_lkeyi, "lkeyi" },
216 { Opt_sec_lkeyp, "lkeyp" },
218 { Opt_sec_err, NULL }
222 static void nfs_umount_begin(struct vfsmount *, int);
223 static int nfs_statfs(struct dentry *, struct kstatfs *);
224 static int nfs_show_options(struct seq_file *, struct vfsmount *);
225 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
226 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
227 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
228 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
229 static void nfs_kill_super(struct super_block *);
231 static struct file_system_type nfs_fs_type = {
232 .owner = THIS_MODULE,
234 .get_sb = nfs_get_sb,
235 .kill_sb = nfs_kill_super,
236 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
239 struct file_system_type nfs_xdev_fs_type = {
240 .owner = THIS_MODULE,
242 .get_sb = nfs_xdev_get_sb,
243 .kill_sb = nfs_kill_super,
244 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
247 static const struct super_operations nfs_sops = {
248 .alloc_inode = nfs_alloc_inode,
249 .destroy_inode = nfs_destroy_inode,
250 .write_inode = nfs_write_inode,
251 .statfs = nfs_statfs,
252 .clear_inode = nfs_clear_inode,
253 .umount_begin = nfs_umount_begin,
254 .show_options = nfs_show_options,
255 .show_stats = nfs_show_stats,
259 static int nfs4_get_sb(struct file_system_type *fs_type,
260 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
261 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
262 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
263 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
264 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
265 static void nfs4_kill_super(struct super_block *sb);
267 static struct file_system_type nfs4_fs_type = {
268 .owner = THIS_MODULE,
270 .get_sb = nfs4_get_sb,
271 .kill_sb = nfs4_kill_super,
272 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
275 struct file_system_type nfs4_xdev_fs_type = {
276 .owner = THIS_MODULE,
278 .get_sb = nfs4_xdev_get_sb,
279 .kill_sb = nfs4_kill_super,
280 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
283 struct file_system_type nfs4_referral_fs_type = {
284 .owner = THIS_MODULE,
286 .get_sb = nfs4_referral_get_sb,
287 .kill_sb = nfs4_kill_super,
288 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
291 static const struct super_operations nfs4_sops = {
292 .alloc_inode = nfs_alloc_inode,
293 .destroy_inode = nfs_destroy_inode,
294 .write_inode = nfs_write_inode,
295 .statfs = nfs_statfs,
296 .clear_inode = nfs4_clear_inode,
297 .umount_begin = nfs_umount_begin,
298 .show_options = nfs_show_options,
299 .show_stats = nfs_show_stats,
303 static struct shrinker acl_shrinker = {
304 .shrink = nfs_access_cache_shrinker,
305 .seeks = DEFAULT_SEEKS,
309 * Register the NFS filesystems
311 int __init register_nfs_fs(void)
315 ret = register_filesystem(&nfs_fs_type);
319 ret = nfs_register_sysctl();
323 ret = register_filesystem(&nfs4_fs_type);
327 register_shrinker(&acl_shrinker);
332 nfs_unregister_sysctl();
335 unregister_filesystem(&nfs_fs_type);
341 * Unregister the NFS filesystems
343 void __exit unregister_nfs_fs(void)
345 unregister_shrinker(&acl_shrinker);
347 unregister_filesystem(&nfs4_fs_type);
348 nfs_unregister_sysctl();
350 unregister_filesystem(&nfs_fs_type);
354 * Deliver file system statistics to userspace
356 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
358 struct nfs_server *server = NFS_SB(dentry->d_sb);
359 unsigned char blockbits;
360 unsigned long blockres;
361 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
362 struct nfs_fattr fattr;
363 struct nfs_fsstat res = {
370 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
373 buf->f_type = NFS_SUPER_MAGIC;
376 * Current versions of glibc do not correctly handle the
377 * case where f_frsize != f_bsize. Eventually we want to
378 * report the value of wtmult in this field.
380 buf->f_frsize = dentry->d_sb->s_blocksize;
383 * On most *nix systems, f_blocks, f_bfree, and f_bavail
384 * are reported in units of f_frsize. Linux hasn't had
385 * an f_frsize field in its statfs struct until recently,
386 * thus historically Linux's sys_statfs reports these
387 * fields in units of f_bsize.
389 buf->f_bsize = dentry->d_sb->s_blocksize;
390 blockbits = dentry->d_sb->s_blocksize_bits;
391 blockres = (1 << blockbits) - 1;
392 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
393 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
394 buf->f_bavail = (res.abytes + blockres) >> blockbits;
396 buf->f_files = res.tfiles;
397 buf->f_ffree = res.afiles;
399 buf->f_namelen = server->namelen;
405 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
411 * Map the security flavour number to a name
413 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
415 static const struct {
416 rpc_authflavor_t flavour;
419 { RPC_AUTH_NULL, "null" },
420 { RPC_AUTH_UNIX, "sys" },
421 { RPC_AUTH_GSS_KRB5, "krb5" },
422 { RPC_AUTH_GSS_KRB5I, "krb5i" },
423 { RPC_AUTH_GSS_KRB5P, "krb5p" },
424 { RPC_AUTH_GSS_LKEY, "lkey" },
425 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
426 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
427 { RPC_AUTH_GSS_SPKM, "spkm" },
428 { RPC_AUTH_GSS_SPKMI, "spkmi" },
429 { RPC_AUTH_GSS_SPKMP, "spkmp" },
430 { UINT_MAX, "unknown" }
434 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
435 if (sec_flavours[i].flavour == flavour)
438 return sec_flavours[i].str;
442 * Describe the mount options in force on this server representation
444 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
446 static const struct proc_nfs_info {
451 { NFS_MOUNT_SOFT, ",soft", ",hard" },
452 { NFS_MOUNT_INTR, ",intr", "" },
453 { NFS_MOUNT_NOCTO, ",nocto", "" },
454 { NFS_MOUNT_NOAC, ",noac", "" },
455 { NFS_MOUNT_NONLM, ",nolock", "" },
456 { NFS_MOUNT_NOACL, ",noacl", "" },
457 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
458 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
461 const struct proc_nfs_info *nfs_infop;
462 struct nfs_client *clp = nfss->nfs_client;
466 seq_printf(m, ",vers=%d", clp->rpc_ops->version);
467 seq_printf(m, ",rsize=%d", nfss->rsize);
468 seq_printf(m, ",wsize=%d", nfss->wsize);
469 if (nfss->acregmin != 3*HZ || showdefaults)
470 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
471 if (nfss->acregmax != 60*HZ || showdefaults)
472 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
473 if (nfss->acdirmin != 30*HZ || showdefaults)
474 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
475 if (nfss->acdirmax != 60*HZ || showdefaults)
476 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
477 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
478 if (nfss->flags & nfs_infop->flag)
479 seq_puts(m, nfs_infop->str);
481 seq_puts(m, nfs_infop->nostr);
483 switch (nfss->client->cl_xprt->prot) {
491 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
494 seq_printf(m, ",proto=%s", proto);
495 seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
496 seq_printf(m, ",retrans=%u", clp->retrans_count);
497 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
501 * Describe the mount options on this VFS mountpoint
503 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
505 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
507 nfs_show_mount_options(m, nfss, 0);
509 seq_puts(m, ",addr=");
510 seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\");
516 * Present statistical information for this VFS mountpoint
518 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
521 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
522 struct rpc_auth *auth = nfss->client->cl_auth;
523 struct nfs_iostats totals = { };
525 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
528 * Display all mount option settings
530 seq_printf(m, "\n\topts:\t");
531 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
532 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
533 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
534 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
535 nfs_show_mount_options(m, nfss, 1);
537 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
539 seq_printf(m, "\n\tcaps:\t");
540 seq_printf(m, "caps=0x%x", nfss->caps);
541 seq_printf(m, ",wtmult=%d", nfss->wtmult);
542 seq_printf(m, ",dtsize=%d", nfss->dtsize);
543 seq_printf(m, ",bsize=%d", nfss->bsize);
544 seq_printf(m, ",namelen=%d", nfss->namelen);
547 if (nfss->nfs_client->cl_nfsversion == 4) {
548 seq_printf(m, "\n\tnfsv4:\t");
549 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
550 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
551 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
556 * Display security flavor in effect for this mount
558 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
560 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
563 * Display superblock I/O counters
565 for_each_possible_cpu(cpu) {
566 struct nfs_iostats *stats;
569 stats = per_cpu_ptr(nfss->io_stats, cpu);
571 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
572 totals.events[i] += stats->events[i];
573 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
574 totals.bytes[i] += stats->bytes[i];
579 seq_printf(m, "\n\tevents:\t");
580 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
581 seq_printf(m, "%lu ", totals.events[i]);
582 seq_printf(m, "\n\tbytes:\t");
583 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
584 seq_printf(m, "%Lu ", totals.bytes[i]);
587 rpc_print_iostats(m, nfss->client);
593 * Begin unmount by attempting to remove all automounted mountpoints we added
594 * in response to xdev traversals and referrals
596 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
598 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
599 struct rpc_clnt *rpc;
601 shrink_submounts(vfsmnt, &nfs_automount_list);
603 if (!(flags & MNT_FORCE))
605 /* -EIO all pending I/O */
606 rpc = server->client_acl;
608 rpc_killall_tasks(rpc);
609 rpc = server->client;
611 rpc_killall_tasks(rpc);
615 * Sanity-check a server address provided by the mount command
617 static int nfs_verify_server_address(struct sockaddr *addr)
619 switch (addr->sa_family) {
621 struct sockaddr_in *sa = (struct sockaddr_in *) addr;
622 if (sa->sin_addr.s_addr != INADDR_ANY)
632 * Error-check and convert a string of mount options from user space into
635 static int nfs_parse_mount_options(char *raw,
636 struct nfs_parsed_mount_data *mnt)
641 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
644 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
646 while ((p = strsep(&raw, ",")) != NULL) {
647 substring_t args[MAX_OPT_ARGS];
653 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
655 token = match_token(p, nfs_mount_option_tokens, args);
658 mnt->flags |= NFS_MOUNT_SOFT;
661 mnt->flags &= ~NFS_MOUNT_SOFT;
664 mnt->flags |= NFS_MOUNT_INTR;
667 mnt->flags &= ~NFS_MOUNT_INTR;
670 mnt->flags |= NFS_MOUNT_POSIX;
673 mnt->flags &= ~NFS_MOUNT_POSIX;
676 mnt->flags &= ~NFS_MOUNT_NOCTO;
679 mnt->flags |= NFS_MOUNT_NOCTO;
682 mnt->flags &= ~NFS_MOUNT_NOAC;
685 mnt->flags |= NFS_MOUNT_NOAC;
688 mnt->flags &= ~NFS_MOUNT_NONLM;
691 mnt->flags |= NFS_MOUNT_NONLM;
694 mnt->flags &= ~NFS_MOUNT_VER3;
697 mnt->flags |= NFS_MOUNT_VER3;
700 mnt->flags &= ~NFS_MOUNT_TCP;
701 mnt->nfs_server.protocol = IPPROTO_UDP;
706 mnt->flags |= NFS_MOUNT_TCP;
707 mnt->nfs_server.protocol = IPPROTO_TCP;
712 mnt->flags &= ~NFS_MOUNT_NOACL;
715 mnt->flags |= NFS_MOUNT_NOACL;
718 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
721 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
724 mnt->flags &= ~NFS_MOUNT_UNSHARED;
726 case Opt_nosharecache:
727 mnt->flags |= NFS_MOUNT_UNSHARED;
731 if (match_int(args, &option))
733 if (option < 0 || option > 65535)
735 mnt->nfs_server.address.sin_port = htons(option);
738 if (match_int(args, &mnt->rsize))
742 if (match_int(args, &mnt->wsize))
746 if (match_int(args, &option))
753 if (match_int(args, &mnt->timeo))
757 if (match_int(args, &mnt->retrans))
761 if (match_int(args, &mnt->acregmin))
765 if (match_int(args, &mnt->acregmax))
769 if (match_int(args, &mnt->acdirmin))
773 if (match_int(args, &mnt->acdirmax))
777 if (match_int(args, &option))
784 mnt->acdirmax = option;
787 if (match_int(args, &mnt->namlen))
791 if (match_int(args, &option))
793 if (option < 0 || option > 65535)
795 mnt->mount_server.port = option;
798 if (match_int(args, &option))
802 mnt->mount_server.program = option;
805 if (match_int(args, &option))
809 mnt->mount_server.version = option;
812 if (match_int(args, &option))
816 mnt->nfs_server.program = option;
819 if (match_int(args, &option))
823 mnt->flags &= ~NFS_MOUNT_VER3;
826 mnt->flags |= NFS_MOUNT_VER3;
834 string = match_strdup(args);
837 token = match_token(string, nfs_secflavor_tokens, args);
841 * The flags setting is for v2/v3. The flavor_len
842 * setting is for v4. v2/v3 also need to know the
843 * difference between NULL and UNIX.
847 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
848 mnt->auth_flavor_len = 0;
849 mnt->auth_flavors[0] = RPC_AUTH_NULL;
852 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
853 mnt->auth_flavor_len = 0;
854 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
857 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
858 mnt->auth_flavor_len = 1;
859 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
862 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
863 mnt->auth_flavor_len = 1;
864 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
867 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
868 mnt->auth_flavor_len = 1;
869 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
872 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
873 mnt->auth_flavor_len = 1;
874 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
877 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
878 mnt->auth_flavor_len = 1;
879 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
882 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
883 mnt->auth_flavor_len = 1;
884 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
887 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
888 mnt->auth_flavor_len = 1;
889 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
892 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
893 mnt->auth_flavor_len = 1;
894 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
897 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
898 mnt->auth_flavor_len = 1;
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
906 string = match_strdup(args);
909 token = match_token(string,
910 nfs_xprt_protocol_tokens, args);
915 mnt->flags &= ~NFS_MOUNT_TCP;
916 mnt->nfs_server.protocol = IPPROTO_UDP;
921 mnt->flags |= NFS_MOUNT_TCP;
922 mnt->nfs_server.protocol = IPPROTO_TCP;
931 string = match_strdup(args);
934 token = match_token(string,
935 nfs_xprt_protocol_tokens, args);
940 mnt->mount_server.protocol = IPPROTO_UDP;
943 mnt->mount_server.protocol = IPPROTO_TCP;
950 string = match_strdup(args);
953 mnt->nfs_server.address.sin_family = AF_INET;
954 mnt->nfs_server.address.sin_addr.s_addr =
959 string = match_strdup(args);
962 mnt->client_address = string;
965 string = match_strdup(args);
968 mnt->mount_server.address.sin_family = AF_INET;
969 mnt->mount_server.address.sin_addr.s_addr =
986 printk(KERN_INFO "NFS: not enough memory to parse option\n");
990 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
994 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
998 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1002 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1007 * Use the remote server's MOUNT service to request the NFS file handle
1008 * corresponding to the provided path.
1010 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1011 struct nfs_fh *root_fh)
1013 struct sockaddr_in sin;
1016 if (args->mount_server.version == 0) {
1017 if (args->flags & NFS_MOUNT_VER3)
1018 args->mount_server.version = NFS_MNT3_VERSION;
1020 args->mount_server.version = NFS_MNT_VERSION;
1024 * Construct the mount server's address.
1026 if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY)
1027 sin = args->mount_server.address;
1029 sin = args->nfs_server.address;
1030 if (args->mount_server.port == 0) {
1031 status = rpcb_getport_sync(&sin,
1032 args->mount_server.program,
1033 args->mount_server.version,
1034 args->mount_server.protocol);
1037 sin.sin_port = htons(status);
1039 sin.sin_port = htons(args->mount_server.port);
1042 * Now ask the mount server to map our export path
1045 status = nfs_mount((struct sockaddr *) &sin,
1047 args->nfs_server.hostname,
1048 args->nfs_server.export_path,
1049 args->mount_server.version,
1050 args->mount_server.protocol,
1058 dfprintk(MOUNT, "NFS: unable to contact server on host "
1059 NIPQUAD_FMT "\n", NIPQUAD(sin.sin_addr.s_addr));
1064 * Validate the NFS2/NFS3 mount data
1065 * - fills in the mount root filehandle
1067 * For option strings, user space handles the following behaviors:
1069 * + DNS: mapping server host name to IP address ("addr=" option)
1071 * + failure mode: how to behave if a mount request can't be handled
1072 * immediately ("fg/bg" option)
1074 * + retry: how often to retry a mount request ("retry=" option)
1076 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1077 * mountproto=tcp after mountproto=udp, and so on
1079 * XXX: as far as I can tell, changing the NFS program number is not
1080 * supported in the NFS client.
1082 static int nfs_validate_mount_data(struct nfs_mount_data **options,
1083 struct nfs_fh *mntfh,
1084 const char *dev_name)
1086 struct nfs_mount_data *data = *options;
1091 switch (data->version) {
1097 if (data->flags & NFS_MOUNT_VER3)
1099 data->root.size = NFS2_FHSIZE;
1100 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1102 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1105 memset(data->context, 0, sizeof(data->context));
1107 if (data->flags & NFS_MOUNT_VER3)
1108 mntfh->size = data->root.size;
1110 mntfh->size = NFS2_FHSIZE;
1112 if (mntfh->size > sizeof(mntfh->data))
1113 goto out_invalid_fh;
1115 memcpy(mntfh->data, data->root.data, mntfh->size);
1116 if (mntfh->size < sizeof(mntfh->data))
1117 memset(mntfh->data + mntfh->size, 0,
1118 sizeof(mntfh->data) - mntfh->size);
1124 struct nfs_parsed_mount_data args = {
1125 .flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP),
1126 .rsize = NFS_MAX_FILE_IO_SIZE,
1127 .wsize = NFS_MAX_FILE_IO_SIZE,
1134 .mount_server.protocol = IPPROTO_UDP,
1135 .mount_server.program = NFS_MNT_PROGRAM,
1136 .nfs_server.protocol = IPPROTO_TCP,
1137 .nfs_server.program = NFS_PROGRAM,
1140 if (nfs_parse_mount_options((char *) *options, &args) == 0)
1143 data = kzalloc(sizeof(*data), GFP_KERNEL);
1148 * NB: after this point, caller will free "data"
1149 * if we return an error
1153 c = strchr(dev_name, ':');
1156 len = c - dev_name - 1;
1157 if (len > sizeof(data->hostname))
1159 strncpy(data->hostname, dev_name, len);
1160 args.nfs_server.hostname = data->hostname;
1163 if (strlen(c) > NFS_MAXPATHLEN)
1165 args.nfs_server.export_path = c;
1167 status = nfs_try_mount(&args, mntfh);
1172 * Translate to nfs_mount_data, which nfs_fill_super
1176 data->flags = args.flags;
1177 data->rsize = args.rsize;
1178 data->wsize = args.wsize;
1179 data->timeo = args.timeo;
1180 data->retrans = args.retrans;
1181 data->acregmin = args.acregmin;
1182 data->acregmax = args.acregmax;
1183 data->acdirmin = args.acdirmin;
1184 data->acdirmax = args.acdirmax;
1185 data->addr = args.nfs_server.address;
1186 data->namlen = args.namlen;
1187 data->bsize = args.bsize;
1188 data->pseudoflavor = args.auth_flavors[0];
1194 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
1195 data->pseudoflavor = RPC_AUTH_UNIX;
1197 #ifndef CONFIG_NFS_V3
1198 if (data->flags & NFS_MOUNT_VER3)
1199 goto out_v3_not_compiled;
1200 #endif /* !CONFIG_NFS_V3 */
1202 if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
1203 goto out_no_address;
1208 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1212 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1217 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1220 #ifndef CONFIG_NFS_V3
1221 out_v3_not_compiled:
1222 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1223 return -EPROTONOSUPPORT;
1224 #endif /* !CONFIG_NFS_V3 */
1227 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1231 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1236 * Initialise the common bits of the superblock
1238 static inline void nfs_initialise_sb(struct super_block *sb)
1240 struct nfs_server *server = NFS_SB(sb);
1242 sb->s_magic = NFS_SUPER_MAGIC;
1244 /* We probably want something more informative here */
1245 snprintf(sb->s_id, sizeof(sb->s_id),
1246 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1248 if (sb->s_blocksize == 0)
1249 sb->s_blocksize = nfs_block_bits(server->wsize,
1250 &sb->s_blocksize_bits);
1252 if (server->flags & NFS_MOUNT_NOAC)
1253 sb->s_flags |= MS_SYNCHRONOUS;
1255 nfs_super_set_maxbytes(sb, server->maxfilesize);
1259 * Finish setting up an NFS2/3 superblock
1261 static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data)
1263 struct nfs_server *server = NFS_SB(sb);
1265 sb->s_blocksize_bits = 0;
1266 sb->s_blocksize = 0;
1268 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1270 if (server->flags & NFS_MOUNT_VER3) {
1271 /* The VFS shouldn't apply the umask to mode bits. We will do
1272 * so ourselves when necessary.
1274 sb->s_flags |= MS_POSIXACL;
1275 sb->s_time_gran = 1;
1278 sb->s_op = &nfs_sops;
1279 nfs_initialise_sb(sb);
1283 * Finish setting up a cloned NFS2/3 superblock
1285 static void nfs_clone_super(struct super_block *sb,
1286 const struct super_block *old_sb)
1288 struct nfs_server *server = NFS_SB(sb);
1290 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1291 sb->s_blocksize = old_sb->s_blocksize;
1292 sb->s_maxbytes = old_sb->s_maxbytes;
1294 if (server->flags & NFS_MOUNT_VER3) {
1295 /* The VFS shouldn't apply the umask to mode bits. We will do
1296 * so ourselves when necessary.
1298 sb->s_flags |= MS_POSIXACL;
1299 sb->s_time_gran = 1;
1302 sb->s_op = old_sb->s_op;
1303 nfs_initialise_sb(sb);
1306 static int nfs_set_super(struct super_block *s, void *_server)
1308 struct nfs_server *server = _server;
1311 s->s_fs_info = server;
1312 ret = set_anon_super(s, server);
1314 server->s_dev = s->s_dev;
1318 static int nfs_compare_super(struct super_block *sb, void *data)
1320 struct nfs_server *server = data, *old = NFS_SB(sb);
1322 if (memcmp(&old->nfs_client->cl_addr,
1323 &server->nfs_client->cl_addr,
1324 sizeof(old->nfs_client->cl_addr)) != 0)
1326 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1327 if (old->flags & NFS_MOUNT_UNSHARED)
1329 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1334 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1336 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1338 const struct nfs_server *a = s->s_fs_info;
1339 const struct rpc_clnt *clnt_a = a->client;
1340 const struct rpc_clnt *clnt_b = b->client;
1342 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1344 if (a->nfs_client != b->nfs_client)
1346 if (a->flags != b->flags)
1348 if (a->wsize != b->wsize)
1350 if (a->rsize != b->rsize)
1352 if (a->acregmin != b->acregmin)
1354 if (a->acregmax != b->acregmax)
1356 if (a->acdirmin != b->acdirmin)
1358 if (a->acdirmax != b->acdirmax)
1360 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1367 static int nfs_get_sb(struct file_system_type *fs_type,
1368 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1370 struct nfs_server *server = NULL;
1371 struct super_block *s;
1372 struct nfs_fh mntfh;
1373 struct nfs_mount_data *data = raw_data;
1374 struct dentry *mntroot;
1375 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1378 /* Validate the mount data */
1379 error = nfs_validate_mount_data(&data, &mntfh, dev_name);
1383 /* Get a volume representation */
1384 server = nfs_create_server(data, &mntfh);
1385 if (IS_ERR(server)) {
1386 error = PTR_ERR(server);
1390 if (server->flags & NFS_MOUNT_UNSHARED)
1391 compare_super = NULL;
1393 /* Get a superblock - note that we may end up sharing one that already exists */
1394 s = sget(fs_type, compare_super, nfs_set_super, server);
1400 if (s->s_fs_info != server) {
1401 error = nfs_compare_mount_options(s, server, flags);
1402 nfs_free_server(server);
1405 goto error_splat_super;
1409 /* initial superblock/root creation */
1411 nfs_fill_super(s, data);
1414 mntroot = nfs_get_root(s, &mntfh);
1415 if (IS_ERR(mntroot)) {
1416 error = PTR_ERR(mntroot);
1417 goto error_splat_super;
1420 s->s_flags |= MS_ACTIVE;
1422 mnt->mnt_root = mntroot;
1426 if (data != raw_data)
1431 nfs_free_server(server);
1435 up_write(&s->s_umount);
1436 deactivate_super(s);
1441 * Destroy an NFS2/3 superblock
1443 static void nfs_kill_super(struct super_block *s)
1445 struct nfs_server *server = NFS_SB(s);
1448 nfs_free_server(server);
1452 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1454 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1455 const char *dev_name, void *raw_data,
1456 struct vfsmount *mnt)
1458 struct nfs_clone_mount *data = raw_data;
1459 struct super_block *s;
1460 struct nfs_server *server;
1461 struct dentry *mntroot;
1462 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1465 dprintk("--> nfs_xdev_get_sb()\n");
1467 /* create a new volume representation */
1468 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1469 if (IS_ERR(server)) {
1470 error = PTR_ERR(server);
1471 goto out_err_noserver;
1474 if (server->flags & NFS_MOUNT_UNSHARED)
1475 compare_super = NULL;
1477 /* Get a superblock - note that we may end up sharing one that already exists */
1478 s = sget(&nfs_fs_type, compare_super, nfs_set_super, server);
1484 if (s->s_fs_info != server) {
1485 error = nfs_compare_mount_options(s, server, flags);
1486 nfs_free_server(server);
1489 goto error_splat_super;
1493 /* initial superblock/root creation */
1495 nfs_clone_super(s, data->sb);
1498 mntroot = nfs_get_root(s, data->fh);
1499 if (IS_ERR(mntroot)) {
1500 error = PTR_ERR(mntroot);
1501 goto error_splat_super;
1504 s->s_flags |= MS_ACTIVE;
1506 mnt->mnt_root = mntroot;
1508 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1512 nfs_free_server(server);
1514 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1518 up_write(&s->s_umount);
1519 deactivate_super(s);
1520 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1524 #ifdef CONFIG_NFS_V4
1527 * Finish setting up a cloned NFS4 superblock
1529 static void nfs4_clone_super(struct super_block *sb,
1530 const struct super_block *old_sb)
1532 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1533 sb->s_blocksize = old_sb->s_blocksize;
1534 sb->s_maxbytes = old_sb->s_maxbytes;
1535 sb->s_time_gran = 1;
1536 sb->s_op = old_sb->s_op;
1537 nfs_initialise_sb(sb);
1541 * Set up an NFS4 superblock
1543 static void nfs4_fill_super(struct super_block *sb)
1545 sb->s_time_gran = 1;
1546 sb->s_op = &nfs4_sops;
1547 nfs_initialise_sb(sb);
1551 * Validate NFSv4 mount options
1553 static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
1554 const char *dev_name,
1555 struct sockaddr_in *addr,
1556 rpc_authflavor_t *authflavour,
1561 struct nfs4_mount_data *data = *options;
1567 switch (data->version) {
1569 if (data->host_addrlen != sizeof(*addr))
1570 goto out_no_address;
1571 if (copy_from_user(addr, data->host_addr, sizeof(*addr)))
1573 if (addr->sin_port == 0)
1574 addr->sin_port = htons(NFS_PORT);
1575 if (!nfs_verify_server_address((struct sockaddr *) addr))
1576 goto out_no_address;
1578 switch (data->auth_flavourlen) {
1580 *authflavour = RPC_AUTH_UNIX;
1583 if (copy_from_user(authflavour, data->auth_flavours,
1584 sizeof(*authflavour)))
1588 goto out_inval_auth;
1591 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1596 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1600 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *mntpath);
1602 c = strndup_user(data->client_addr.data, 16);
1610 struct nfs_parsed_mount_data args = {
1611 .rsize = NFS_MAX_FILE_IO_SIZE,
1612 .wsize = NFS_MAX_FILE_IO_SIZE,
1619 .nfs_server.protocol = IPPROTO_TCP,
1622 if (nfs_parse_mount_options((char *) *options, &args) == 0)
1625 if (!nfs_verify_server_address((struct sockaddr *)
1626 &args.nfs_server.address))
1628 *addr = args.nfs_server.address;
1630 switch (args.auth_flavor_len) {
1632 *authflavour = RPC_AUTH_UNIX;
1635 *authflavour = (rpc_authflavor_t) args.auth_flavors[0];
1638 goto out_inval_auth;
1642 * Translate to nfs4_mount_data, which nfs4_fill_super
1645 data = kzalloc(sizeof(*data), GFP_KERNEL);
1651 data->flags = args.flags & NFS4_MOUNT_FLAGMASK;
1652 data->rsize = args.rsize;
1653 data->wsize = args.wsize;
1654 data->timeo = args.timeo;
1655 data->retrans = args.retrans;
1656 data->acregmin = args.acregmin;
1657 data->acregmax = args.acregmax;
1658 data->acdirmin = args.acdirmin;
1659 data->acdirmax = args.acdirmax;
1660 data->proto = args.nfs_server.protocol;
1663 * Split "dev_name" into "hostname:mntpath".
1665 c = strchr(dev_name, ':');
1668 /* while calculating len, pretend ':' is '\0' */
1670 if (len > NFS4_MAXNAMLEN)
1672 *hostname = kzalloc(len, GFP_KERNEL);
1673 if (*hostname == NULL)
1675 strncpy(*hostname, dev_name, len - 1);
1677 c++; /* step over the ':' */
1679 if (len > NFS4_MAXPATHLEN)
1681 *mntpath = kzalloc(len + 1, GFP_KERNEL);
1682 if (*mntpath == NULL)
1684 strncpy(*mntpath, c, len);
1686 dprintk("MNTPATH: %s\n", *mntpath);
1688 if (args.client_address == NULL)
1689 goto out_no_client_address;
1691 *ip_addr = args.client_address;
1700 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1704 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1705 data->auth_flavourlen);
1709 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1712 out_no_client_address:
1713 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1718 * Get the superblock for an NFS4 mountpoint
1720 static int nfs4_get_sb(struct file_system_type *fs_type,
1721 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1723 struct nfs4_mount_data *data = raw_data;
1724 struct super_block *s;
1725 struct nfs_server *server;
1726 struct sockaddr_in addr;
1727 rpc_authflavor_t authflavour;
1728 struct nfs_fh mntfh;
1729 struct dentry *mntroot;
1730 char *mntpath = NULL, *hostname = NULL, *ip_addr = NULL;
1731 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1734 /* Validate the mount data */
1735 error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour,
1736 &hostname, &mntpath, &ip_addr);
1740 /* Get a volume representation */
1741 server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr,
1742 authflavour, &mntfh);
1743 if (IS_ERR(server)) {
1744 error = PTR_ERR(server);
1748 if (server->flags & NFS4_MOUNT_UNSHARED)
1749 compare_super = NULL;
1751 /* Get a superblock - note that we may end up sharing one that already exists */
1752 s = sget(fs_type, compare_super, nfs_set_super, server);
1758 if (s->s_fs_info != server) {
1759 nfs_free_server(server);
1764 /* initial superblock/root creation */
1769 mntroot = nfs4_get_root(s, &mntfh);
1770 if (IS_ERR(mntroot)) {
1771 error = PTR_ERR(mntroot);
1772 goto error_splat_super;
1775 s->s_flags |= MS_ACTIVE;
1777 mnt->mnt_root = mntroot;
1787 nfs_free_server(server);
1791 up_write(&s->s_umount);
1792 deactivate_super(s);
1796 static void nfs4_kill_super(struct super_block *sb)
1798 struct nfs_server *server = NFS_SB(sb);
1800 nfs_return_all_delegations(sb);
1801 kill_anon_super(sb);
1803 nfs4_renewd_prepare_shutdown(server);
1804 nfs_free_server(server);
1808 * Clone an NFS4 server record on xdev traversal (FSID-change)
1810 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1811 const char *dev_name, void *raw_data,
1812 struct vfsmount *mnt)
1814 struct nfs_clone_mount *data = raw_data;
1815 struct super_block *s;
1816 struct nfs_server *server;
1817 struct dentry *mntroot;
1818 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1821 dprintk("--> nfs4_xdev_get_sb()\n");
1823 /* create a new volume representation */
1824 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1825 if (IS_ERR(server)) {
1826 error = PTR_ERR(server);
1827 goto out_err_noserver;
1830 if (server->flags & NFS4_MOUNT_UNSHARED)
1831 compare_super = NULL;
1833 /* Get a superblock - note that we may end up sharing one that already exists */
1834 s = sget(&nfs_fs_type, compare_super, nfs_set_super, server);
1840 if (s->s_fs_info != server) {
1841 nfs_free_server(server);
1846 /* initial superblock/root creation */
1848 nfs4_clone_super(s, data->sb);
1851 mntroot = nfs4_get_root(s, data->fh);
1852 if (IS_ERR(mntroot)) {
1853 error = PTR_ERR(mntroot);
1854 goto error_splat_super;
1857 s->s_flags |= MS_ACTIVE;
1859 mnt->mnt_root = mntroot;
1861 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1865 nfs_free_server(server);
1867 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
1871 up_write(&s->s_umount);
1872 deactivate_super(s);
1873 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
1878 * Create an NFS4 server record on referral traversal
1880 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
1881 const char *dev_name, void *raw_data,
1882 struct vfsmount *mnt)
1884 struct nfs_clone_mount *data = raw_data;
1885 struct super_block *s;
1886 struct nfs_server *server;
1887 struct dentry *mntroot;
1888 struct nfs_fh mntfh;
1889 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1892 dprintk("--> nfs4_referral_get_sb()\n");
1894 /* create a new volume representation */
1895 server = nfs4_create_referral_server(data, &mntfh);
1896 if (IS_ERR(server)) {
1897 error = PTR_ERR(server);
1898 goto out_err_noserver;
1901 if (server->flags & NFS4_MOUNT_UNSHARED)
1902 compare_super = NULL;
1904 /* Get a superblock - note that we may end up sharing one that already exists */
1905 s = sget(&nfs_fs_type, compare_super, nfs_set_super, server);
1911 if (s->s_fs_info != server) {
1912 nfs_free_server(server);
1917 /* initial superblock/root creation */
1922 mntroot = nfs4_get_root(s, &mntfh);
1923 if (IS_ERR(mntroot)) {
1924 error = PTR_ERR(mntroot);
1925 goto error_splat_super;
1928 s->s_flags |= MS_ACTIVE;
1930 mnt->mnt_root = mntroot;
1932 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1936 nfs_free_server(server);
1938 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
1942 up_write(&s->s_umount);
1943 deactivate_super(s);
1944 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
1948 #endif /* CONFIG_NFS_V4 */