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/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
58 #include <asm/uaccess.h>
62 #include "delegation.h"
68 #define NFSDBG_FACILITY NFSDBG_VFS
69 #define NFS_TEXT_DATA 1
72 #define NFS_DEFAULT_VERSION 3
74 #define NFS_DEFAULT_VERSION 2
78 /* Mount options that take no arguments */
80 Opt_posix, Opt_noposix,
84 Opt_udp, Opt_tcp, Opt_rdma,
86 Opt_rdirplus, Opt_nordirplus,
87 Opt_sharecache, Opt_nosharecache,
88 Opt_resvport, Opt_noresvport,
89 Opt_fscache, Opt_nofscache,
91 /* Mount options that take integer arguments */
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
103 /* Mount options that take string arguments */
105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
117 static const match_table_t nfs_mount_option_tokens = {
118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
120 { Opt_userspace, "retry=%s" },
122 { Opt_sloppy, "sloppy" },
124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
131 { Opt_nocto, "nocto" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
138 { Opt_rdma, "rdma" },
140 { Opt_noacl, "noacl" },
141 { Opt_rdirplus, "rdirplus" },
142 { Opt_nordirplus, "nordirplus" },
143 { Opt_sharecache, "sharecache" },
144 { Opt_nosharecache, "nosharecache" },
145 { Opt_resvport, "resvport" },
146 { Opt_noresvport, "noresvport" },
147 { Opt_fscache, "fsc" },
148 { Opt_nofscache, "nofsc" },
150 { Opt_port, "port=%s" },
151 { Opt_rsize, "rsize=%s" },
152 { Opt_wsize, "wsize=%s" },
153 { Opt_bsize, "bsize=%s" },
154 { Opt_timeo, "timeo=%s" },
155 { Opt_retrans, "retrans=%s" },
156 { Opt_acregmin, "acregmin=%s" },
157 { Opt_acregmax, "acregmax=%s" },
158 { Opt_acdirmin, "acdirmin=%s" },
159 { Opt_acdirmax, "acdirmax=%s" },
160 { Opt_actimeo, "actimeo=%s" },
161 { Opt_namelen, "namlen=%s" },
162 { Opt_mountport, "mountport=%s" },
163 { Opt_mountvers, "mountvers=%s" },
164 { Opt_minorversion, "minorversion=%s" },
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
169 { Opt_sec, "sec=%s" },
170 { Opt_proto, "proto=%s" },
171 { Opt_mountproto, "mountproto=%s" },
172 { Opt_addr, "addr=%s" },
173 { Opt_clientaddr, "clientaddr=%s" },
174 { Opt_mounthost, "mounthost=%s" },
175 { Opt_mountaddr, "mountaddr=%s" },
177 { Opt_lookupcache, "lookupcache=%s" },
178 { Opt_fscache_uniq, "fsc=%s" },
179 { Opt_local_lock, "local_lock=%s" },
181 /* The following needs to be listed after all other options */
182 { Opt_nfsvers, "v%s" },
188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
193 static const match_table_t nfs_xprt_protocol_tokens = {
194 { Opt_xprt_udp, "udp" },
195 { Opt_xprt_udp6, "udp6" },
196 { Opt_xprt_tcp, "tcp" },
197 { Opt_xprt_tcp6, "tcp6" },
198 { Opt_xprt_rdma, "rdma" },
200 { Opt_xprt_err, NULL }
204 Opt_sec_none, Opt_sec_sys,
205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
212 static const match_table_t nfs_secflavor_tokens = {
213 { Opt_sec_none, "none" },
214 { Opt_sec_none, "null" },
215 { Opt_sec_sys, "sys" },
217 { Opt_sec_krb5, "krb5" },
218 { Opt_sec_krb5i, "krb5i" },
219 { Opt_sec_krb5p, "krb5p" },
221 { Opt_sec_lkey, "lkey" },
222 { Opt_sec_lkeyi, "lkeyi" },
223 { Opt_sec_lkeyp, "lkeyp" },
225 { Opt_sec_spkm, "spkm3" },
226 { Opt_sec_spkmi, "spkm3i" },
227 { Opt_sec_spkmp, "spkm3p" },
229 { Opt_sec_err, NULL }
233 Opt_lookupcache_all, Opt_lookupcache_positive,
234 Opt_lookupcache_none,
239 static match_table_t nfs_lookupcache_tokens = {
240 { Opt_lookupcache_all, "all" },
241 { Opt_lookupcache_positive, "pos" },
242 { Opt_lookupcache_positive, "positive" },
243 { Opt_lookupcache_none, "none" },
245 { Opt_lookupcache_err, NULL }
249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
255 static match_table_t nfs_local_lock_tokens = {
256 { Opt_local_lock_all, "all" },
257 { Opt_local_lock_flock, "flock" },
258 { Opt_local_lock_posix, "posix" },
259 { Opt_local_lock_none, "none" },
261 { Opt_local_lock_err, NULL }
265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
271 static match_table_t nfs_vers_tokens = {
275 { Opt_vers_4_0, "4.0" },
276 { Opt_vers_4_1, "4.1" },
278 { Opt_vers_err, NULL }
281 struct nfs_mount_info {
282 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
283 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
284 struct nfs_parsed_mount_data *parsed;
285 struct nfs_clone_mount *cloned;
286 struct nfs_fh *mntfh;
289 static void nfs_umount_begin(struct super_block *);
290 static int nfs_statfs(struct dentry *, struct kstatfs *);
291 static int nfs_show_options(struct seq_file *, struct dentry *);
292 static int nfs_show_devname(struct seq_file *, struct dentry *);
293 static int nfs_show_path(struct seq_file *, struct dentry *);
294 static int nfs_show_stats(struct seq_file *, struct dentry *);
295 static struct dentry *nfs_fs_mount_common(struct file_system_type *,
296 struct nfs_server *, int, const char *, struct nfs_mount_info *);
297 static struct dentry *nfs_fs_mount(struct file_system_type *,
298 int, const char *, void *);
299 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
300 int flags, const char *dev_name, void *raw_data);
301 static void nfs_put_super(struct super_block *);
302 static void nfs_kill_super(struct super_block *);
303 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
305 static struct file_system_type nfs_fs_type = {
306 .owner = THIS_MODULE,
308 .mount = nfs_fs_mount,
309 .kill_sb = nfs_kill_super,
310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
313 struct file_system_type nfs_xdev_fs_type = {
314 .owner = THIS_MODULE,
316 .mount = nfs_xdev_mount,
317 .kill_sb = nfs_kill_super,
318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
321 static const struct super_operations nfs_sops = {
322 .alloc_inode = nfs_alloc_inode,
323 .destroy_inode = nfs_destroy_inode,
324 .write_inode = nfs_write_inode,
325 .put_super = nfs_put_super,
326 .statfs = nfs_statfs,
327 .evict_inode = nfs_evict_inode,
328 .umount_begin = nfs_umount_begin,
329 .show_options = nfs_show_options,
330 .show_devname = nfs_show_devname,
331 .show_path = nfs_show_path,
332 .show_stats = nfs_show_stats,
333 .remount_fs = nfs_remount,
337 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
338 static int nfs4_validate_mount_data(void *options,
339 struct nfs_parsed_mount_data *args, const char *dev_name);
340 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
341 struct nfs_mount_info *mount_info);
342 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
343 int flags, const char *dev_name, void *raw_data);
344 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
345 int flags, const char *dev_name, void *raw_data);
346 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
347 int flags, const char *dev_name, void *raw_data);
348 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
349 int flags, const char *dev_name, void *raw_data);
350 static void nfs4_kill_super(struct super_block *sb);
352 static struct file_system_type nfs4_fs_type = {
353 .owner = THIS_MODULE,
355 .mount = nfs_fs_mount,
356 .kill_sb = nfs4_kill_super,
357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
360 static struct file_system_type nfs4_remote_fs_type = {
361 .owner = THIS_MODULE,
363 .mount = nfs4_remote_mount,
364 .kill_sb = nfs4_kill_super,
365 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
368 struct file_system_type nfs4_xdev_fs_type = {
369 .owner = THIS_MODULE,
371 .mount = nfs4_xdev_mount,
372 .kill_sb = nfs4_kill_super,
373 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
376 static struct file_system_type nfs4_remote_referral_fs_type = {
377 .owner = THIS_MODULE,
379 .mount = nfs4_remote_referral_mount,
380 .kill_sb = nfs4_kill_super,
381 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
384 struct file_system_type nfs4_referral_fs_type = {
385 .owner = THIS_MODULE,
387 .mount = nfs4_referral_mount,
388 .kill_sb = nfs4_kill_super,
389 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
392 static const struct super_operations nfs4_sops = {
393 .alloc_inode = nfs_alloc_inode,
394 .destroy_inode = nfs_destroy_inode,
395 .write_inode = nfs_write_inode,
396 .put_super = nfs_put_super,
397 .statfs = nfs_statfs,
398 .evict_inode = nfs4_evict_inode,
399 .umount_begin = nfs_umount_begin,
400 .show_options = nfs_show_options,
401 .show_devname = nfs_show_devname,
402 .show_path = nfs_show_path,
403 .show_stats = nfs_show_stats,
404 .remount_fs = nfs_remount,
408 static struct shrinker acl_shrinker = {
409 .shrink = nfs_access_cache_shrinker,
410 .seeks = DEFAULT_SEEKS,
414 * Register the NFS filesystems
416 int __init register_nfs_fs(void)
420 ret = register_filesystem(&nfs_fs_type);
424 ret = nfs_register_sysctl();
428 ret = register_filesystem(&nfs4_fs_type);
432 register_shrinker(&acl_shrinker);
437 nfs_unregister_sysctl();
440 unregister_filesystem(&nfs_fs_type);
446 * Unregister the NFS filesystems
448 void __exit unregister_nfs_fs(void)
450 unregister_shrinker(&acl_shrinker);
452 unregister_filesystem(&nfs4_fs_type);
454 nfs_unregister_sysctl();
455 unregister_filesystem(&nfs_fs_type);
458 void nfs_sb_active(struct super_block *sb)
460 struct nfs_server *server = NFS_SB(sb);
462 if (atomic_inc_return(&server->active) == 1)
463 atomic_inc(&sb->s_active);
466 void nfs_sb_deactive(struct super_block *sb)
468 struct nfs_server *server = NFS_SB(sb);
470 if (atomic_dec_and_test(&server->active))
471 deactivate_super(sb);
475 * Deliver file system statistics to userspace
477 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
479 struct nfs_server *server = NFS_SB(dentry->d_sb);
480 unsigned char blockbits;
481 unsigned long blockres;
482 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
483 struct nfs_fsstat res;
486 res.fattr = nfs_alloc_fattr();
487 if (res.fattr == NULL)
490 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
491 if (unlikely(error == -ESTALE)) {
492 struct dentry *pd_dentry;
494 pd_dentry = dget_parent(dentry);
495 if (pd_dentry != NULL) {
496 nfs_zap_caches(pd_dentry->d_inode);
500 nfs_free_fattr(res.fattr);
504 buf->f_type = NFS_SUPER_MAGIC;
507 * Current versions of glibc do not correctly handle the
508 * case where f_frsize != f_bsize. Eventually we want to
509 * report the value of wtmult in this field.
511 buf->f_frsize = dentry->d_sb->s_blocksize;
514 * On most *nix systems, f_blocks, f_bfree, and f_bavail
515 * are reported in units of f_frsize. Linux hasn't had
516 * an f_frsize field in its statfs struct until recently,
517 * thus historically Linux's sys_statfs reports these
518 * fields in units of f_bsize.
520 buf->f_bsize = dentry->d_sb->s_blocksize;
521 blockbits = dentry->d_sb->s_blocksize_bits;
522 blockres = (1 << blockbits) - 1;
523 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
524 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
525 buf->f_bavail = (res.abytes + blockres) >> blockbits;
527 buf->f_files = res.tfiles;
528 buf->f_ffree = res.afiles;
530 buf->f_namelen = server->namelen;
535 dprintk("%s: statfs error = %d\n", __func__, -error);
540 * Map the security flavour number to a name
542 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
544 static const struct {
545 rpc_authflavor_t flavour;
548 { RPC_AUTH_NULL, "null" },
549 { RPC_AUTH_UNIX, "sys" },
550 { RPC_AUTH_GSS_KRB5, "krb5" },
551 { RPC_AUTH_GSS_KRB5I, "krb5i" },
552 { RPC_AUTH_GSS_KRB5P, "krb5p" },
553 { RPC_AUTH_GSS_LKEY, "lkey" },
554 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
555 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
556 { RPC_AUTH_GSS_SPKM, "spkm" },
557 { RPC_AUTH_GSS_SPKMI, "spkmi" },
558 { RPC_AUTH_GSS_SPKMP, "spkmp" },
559 { UINT_MAX, "unknown" }
563 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
564 if (sec_flavours[i].flavour == flavour)
567 return sec_flavours[i].str;
570 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
573 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
575 seq_printf(m, ",mountproto=");
576 switch (sap->sa_family) {
578 switch (nfss->mountd_protocol) {
580 seq_printf(m, RPCBIND_NETID_UDP);
583 seq_printf(m, RPCBIND_NETID_TCP);
587 seq_printf(m, "auto");
591 switch (nfss->mountd_protocol) {
593 seq_printf(m, RPCBIND_NETID_UDP6);
596 seq_printf(m, RPCBIND_NETID_TCP6);
600 seq_printf(m, "auto");
605 seq_printf(m, "auto");
609 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
612 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
614 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
617 switch (sap->sa_family) {
619 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
620 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
624 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
625 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
630 seq_printf(m, ",mountaddr=unspecified");
633 if (nfss->mountd_version || showdefaults)
634 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
635 if ((nfss->mountd_port &&
636 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
638 seq_printf(m, ",mountport=%u", nfss->mountd_port);
640 nfs_show_mountd_netid(m, nfss, showdefaults);
644 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
647 struct nfs_client *clp = nfss->nfs_client;
649 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
652 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
658 static void nfs_show_nfs_version(struct seq_file *m,
659 unsigned int version,
660 unsigned int minorversion)
662 seq_printf(m, ",vers=%u", version);
664 seq_printf(m, ".%u", minorversion);
668 * Describe the mount options in force on this server representation
670 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
673 static const struct proc_nfs_info {
678 { NFS_MOUNT_SOFT, ",soft", ",hard" },
679 { NFS_MOUNT_POSIX, ",posix", "" },
680 { NFS_MOUNT_NOCTO, ",nocto", "" },
681 { NFS_MOUNT_NOAC, ",noac", "" },
682 { NFS_MOUNT_NONLM, ",nolock", "" },
683 { NFS_MOUNT_NOACL, ",noacl", "" },
684 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
685 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
686 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
689 const struct proc_nfs_info *nfs_infop;
690 struct nfs_client *clp = nfss->nfs_client;
691 u32 version = clp->rpc_ops->version;
692 int local_flock, local_fcntl;
694 nfs_show_nfs_version(m, version, clp->cl_minorversion);
695 seq_printf(m, ",rsize=%u", nfss->rsize);
696 seq_printf(m, ",wsize=%u", nfss->wsize);
697 if (nfss->bsize != 0)
698 seq_printf(m, ",bsize=%u", nfss->bsize);
699 seq_printf(m, ",namlen=%u", nfss->namelen);
700 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
701 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
702 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
703 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
704 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
705 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
706 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
707 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
708 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
709 if (nfss->flags & nfs_infop->flag)
710 seq_puts(m, nfs_infop->str);
712 seq_puts(m, nfs_infop->nostr);
715 seq_printf(m, ",proto=%s",
716 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
719 if (nfss->port != NFS_PORT)
720 seq_printf(m, ",port=%u", nfss->port);
723 seq_printf(m, ",port=%u", nfss->port);
725 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
726 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
727 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
730 nfs_show_mountd_options(m, nfss, showdefaults);
732 nfs_show_nfsv4_options(m, nfss, showdefaults);
734 if (nfss->options & NFS_OPTION_FSCACHE)
735 seq_printf(m, ",fsc");
737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
738 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
739 seq_printf(m, ",lookupcache=none");
741 seq_printf(m, ",lookupcache=pos");
744 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
745 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
747 if (!local_flock && !local_fcntl)
748 seq_printf(m, ",local_lock=none");
749 else if (local_flock && local_fcntl)
750 seq_printf(m, ",local_lock=all");
751 else if (local_flock)
752 seq_printf(m, ",local_lock=flock");
754 seq_printf(m, ",local_lock=posix");
758 * Describe the mount options on this VFS mountpoint
760 static int nfs_show_options(struct seq_file *m, struct dentry *root)
762 struct nfs_server *nfss = NFS_SB(root->d_sb);
764 nfs_show_mount_options(m, nfss, 0);
767 seq_printf(m, ",addr=%s",
768 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
776 #ifdef CONFIG_NFS_V4_1
777 static void show_sessions(struct seq_file *m, struct nfs_server *server)
779 if (nfs4_has_session(server->nfs_client))
780 seq_printf(m, ",sessions");
783 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
787 #ifdef CONFIG_NFS_V4_1
788 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
790 seq_printf(m, ",pnfs=");
791 if (server->pnfs_curr_ld)
792 seq_printf(m, "%s", server->pnfs_curr_ld->name);
794 seq_printf(m, "not configured");
797 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
803 impl_id->name, impl_id->domain,
804 impl_id->date.seconds, impl_id->date.nseconds);
809 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
813 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
818 static int nfs_show_devname(struct seq_file *m, struct dentry *root)
820 char *page = (char *) __get_free_page(GFP_KERNEL);
821 char *devname, *dummy;
825 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
827 err = PTR_ERR(devname);
829 seq_escape(m, devname, " \t\n\\");
830 free_page((unsigned long)page);
834 static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
841 * Present statistical information for this VFS mountpoint
843 static int nfs_show_stats(struct seq_file *m, struct dentry *root)
846 struct nfs_server *nfss = NFS_SB(root->d_sb);
847 struct rpc_auth *auth = nfss->client->cl_auth;
848 struct nfs_iostats totals = { };
850 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
853 * Display all mount option settings
855 seq_printf(m, "\n\topts:\t");
856 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
857 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
858 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
859 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
860 nfs_show_mount_options(m, nfss, 1);
862 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
864 show_implementation_id(m, nfss);
866 seq_printf(m, "\n\tcaps:\t");
867 seq_printf(m, "caps=0x%x", nfss->caps);
868 seq_printf(m, ",wtmult=%u", nfss->wtmult);
869 seq_printf(m, ",dtsize=%u", nfss->dtsize);
870 seq_printf(m, ",bsize=%u", nfss->bsize);
871 seq_printf(m, ",namlen=%u", nfss->namelen);
874 if (nfss->nfs_client->rpc_ops->version == 4) {
875 seq_printf(m, "\n\tnfsv4:\t");
876 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
877 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
878 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
879 show_sessions(m, nfss);
885 * Display security flavor in effect for this mount
887 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
889 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
892 * Display superblock I/O counters
894 for_each_possible_cpu(cpu) {
895 struct nfs_iostats *stats;
898 stats = per_cpu_ptr(nfss->io_stats, cpu);
900 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
901 totals.events[i] += stats->events[i];
902 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
903 totals.bytes[i] += stats->bytes[i];
904 #ifdef CONFIG_NFS_FSCACHE
905 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
906 totals.fscache[i] += stats->fscache[i];
912 seq_printf(m, "\n\tevents:\t");
913 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
914 seq_printf(m, "%lu ", totals.events[i]);
915 seq_printf(m, "\n\tbytes:\t");
916 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
917 seq_printf(m, "%Lu ", totals.bytes[i]);
918 #ifdef CONFIG_NFS_FSCACHE
919 if (nfss->options & NFS_OPTION_FSCACHE) {
920 seq_printf(m, "\n\tfsc:\t");
921 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
922 seq_printf(m, "%Lu ", totals.bytes[i]);
927 rpc_print_iostats(m, nfss->client);
933 * Begin unmount by attempting to remove all automounted mountpoints we added
934 * in response to xdev traversals and referrals
936 static void nfs_umount_begin(struct super_block *sb)
938 struct nfs_server *server;
939 struct rpc_clnt *rpc;
942 /* -EIO all pending I/O */
943 rpc = server->client_acl;
945 rpc_killall_tasks(rpc);
946 rpc = server->client;
948 rpc_killall_tasks(rpc);
951 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
953 struct nfs_parsed_mount_data *data;
955 data = kzalloc(sizeof(*data), GFP_KERNEL);
957 data->acregmin = NFS_DEF_ACREGMIN;
958 data->acregmax = NFS_DEF_ACREGMAX;
959 data->acdirmin = NFS_DEF_ACDIRMIN;
960 data->acdirmax = NFS_DEF_ACDIRMAX;
961 data->mount_server.port = NFS_UNSPEC_PORT;
962 data->nfs_server.port = NFS_UNSPEC_PORT;
963 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
964 data->auth_flavors[0] = RPC_AUTH_UNIX;
965 data->auth_flavor_len = 1;
966 data->minorversion = 0;
967 data->need_mount = true;
968 data->net = current->nsproxy->net_ns;
969 security_init_mnt_opts(&data->lsm_opts);
974 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
977 kfree(data->client_address);
978 kfree(data->mount_server.hostname);
979 kfree(data->nfs_server.export_path);
980 kfree(data->nfs_server.hostname);
981 kfree(data->fscache_uniq);
982 security_free_mnt_opts(&data->lsm_opts);
988 * Sanity-check a server address provided by the mount command.
990 * Address family must be initialized, and address must not be
991 * the ANY address for that family.
993 static int nfs_verify_server_address(struct sockaddr *addr)
995 switch (addr->sa_family) {
997 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
998 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
1001 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1002 return !ipv6_addr_any(sa);
1006 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
1011 * Select between a default port value and a user-specified port value.
1012 * If a zero value is set, then autobind will be used.
1014 static void nfs_set_port(struct sockaddr *sap, int *port,
1015 const unsigned short default_port)
1017 if (*port == NFS_UNSPEC_PORT)
1018 *port = default_port;
1020 rpc_set_port(sap, *port);
1024 * Sanity check the NFS transport protocol.
1027 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1029 switch (mnt->nfs_server.protocol) {
1030 case XPRT_TRANSPORT_UDP:
1031 case XPRT_TRANSPORT_TCP:
1032 case XPRT_TRANSPORT_RDMA:
1035 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1040 * For text based NFSv2/v3 mounts, the mount protocol transport default
1041 * settings should depend upon the specified NFS transport.
1043 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1045 nfs_validate_transport_protocol(mnt);
1047 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1048 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1050 switch (mnt->nfs_server.protocol) {
1051 case XPRT_TRANSPORT_UDP:
1052 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1054 case XPRT_TRANSPORT_TCP:
1055 case XPRT_TRANSPORT_RDMA:
1056 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1061 * Parse the value of the 'sec=' option.
1063 static int nfs_parse_security_flavors(char *value,
1064 struct nfs_parsed_mount_data *mnt)
1066 substring_t args[MAX_OPT_ARGS];
1068 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1070 switch (match_token(value, nfs_secflavor_tokens, args)) {
1072 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1075 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1081 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1084 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1087 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1090 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1093 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1096 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1099 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1102 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1108 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1109 mnt->auth_flavor_len = 1;
1113 static int nfs_parse_version_string(char *string,
1114 struct nfs_parsed_mount_data *mnt,
1117 mnt->flags &= ~NFS_MOUNT_VER3;
1118 switch (match_token(string, nfs_vers_tokens, args)) {
1123 mnt->flags |= NFS_MOUNT_VER3;
1127 /* Backward compatibility option. In future,
1128 * the mount program should always supply
1129 * a NFSv4 minor version number.
1135 mnt->minorversion = 0;
1139 mnt->minorversion = 1;
1147 static int nfs_get_option_str(substring_t args[], char **option)
1150 *option = match_strdup(args);
1154 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1159 string = match_strdup(args);
1162 rc = strict_strtoul(string, 10, option);
1169 * Error-check and convert a string of mount options from user space into
1170 * a data structure. The whole mount string is processed; bad options are
1171 * skipped as they are encountered. If there were no errors, return 1;
1172 * otherwise return 0 (zero).
1174 static int nfs_parse_mount_options(char *raw,
1175 struct nfs_parsed_mount_data *mnt)
1177 char *p, *string, *secdata;
1178 int rc, sloppy = 0, invalid_option = 0;
1179 unsigned short protofamily = AF_UNSPEC;
1180 unsigned short mountfamily = AF_UNSPEC;
1183 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1186 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1188 secdata = alloc_secdata();
1192 rc = security_sb_copy_data(raw, secdata);
1194 goto out_security_failure;
1196 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1198 goto out_security_failure;
1200 free_secdata(secdata);
1202 while ((p = strsep(&raw, ",")) != NULL) {
1203 substring_t args[MAX_OPT_ARGS];
1204 unsigned long option;
1210 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1212 token = match_token(p, nfs_mount_option_tokens, args);
1216 * boolean options: foo/nofoo
1219 mnt->flags |= NFS_MOUNT_SOFT;
1222 mnt->flags &= ~NFS_MOUNT_SOFT;
1225 mnt->flags |= NFS_MOUNT_POSIX;
1228 mnt->flags &= ~NFS_MOUNT_POSIX;
1231 mnt->flags &= ~NFS_MOUNT_NOCTO;
1234 mnt->flags |= NFS_MOUNT_NOCTO;
1237 mnt->flags &= ~NFS_MOUNT_NOAC;
1240 mnt->flags |= NFS_MOUNT_NOAC;
1243 mnt->flags &= ~NFS_MOUNT_NONLM;
1244 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1245 NFS_MOUNT_LOCAL_FCNTL);
1248 mnt->flags |= NFS_MOUNT_NONLM;
1249 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1250 NFS_MOUNT_LOCAL_FCNTL);
1253 mnt->flags &= ~NFS_MOUNT_TCP;
1254 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1257 mnt->flags |= NFS_MOUNT_TCP;
1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1261 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1262 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1263 xprt_load_transport(p);
1266 mnt->flags &= ~NFS_MOUNT_NOACL;
1269 mnt->flags |= NFS_MOUNT_NOACL;
1272 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1274 case Opt_nordirplus:
1275 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1277 case Opt_sharecache:
1278 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1280 case Opt_nosharecache:
1281 mnt->flags |= NFS_MOUNT_UNSHARED;
1284 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1286 case Opt_noresvport:
1287 mnt->flags |= NFS_MOUNT_NORESVPORT;
1290 mnt->options |= NFS_OPTION_FSCACHE;
1291 kfree(mnt->fscache_uniq);
1292 mnt->fscache_uniq = NULL;
1295 mnt->options &= ~NFS_OPTION_FSCACHE;
1296 kfree(mnt->fscache_uniq);
1297 mnt->fscache_uniq = NULL;
1301 * options that take numeric values
1304 if (nfs_get_option_ul(args, &option) ||
1306 goto out_invalid_value;
1307 mnt->nfs_server.port = option;
1310 if (nfs_get_option_ul(args, &option))
1311 goto out_invalid_value;
1312 mnt->rsize = option;
1315 if (nfs_get_option_ul(args, &option))
1316 goto out_invalid_value;
1317 mnt->wsize = option;
1320 if (nfs_get_option_ul(args, &option))
1321 goto out_invalid_value;
1322 mnt->bsize = option;
1325 if (nfs_get_option_ul(args, &option) || option == 0)
1326 goto out_invalid_value;
1327 mnt->timeo = option;
1330 if (nfs_get_option_ul(args, &option) || option == 0)
1331 goto out_invalid_value;
1332 mnt->retrans = option;
1335 if (nfs_get_option_ul(args, &option))
1336 goto out_invalid_value;
1337 mnt->acregmin = option;
1340 if (nfs_get_option_ul(args, &option))
1341 goto out_invalid_value;
1342 mnt->acregmax = option;
1345 if (nfs_get_option_ul(args, &option))
1346 goto out_invalid_value;
1347 mnt->acdirmin = option;
1350 if (nfs_get_option_ul(args, &option))
1351 goto out_invalid_value;
1352 mnt->acdirmax = option;
1355 if (nfs_get_option_ul(args, &option))
1356 goto out_invalid_value;
1357 mnt->acregmin = mnt->acregmax =
1358 mnt->acdirmin = mnt->acdirmax = option;
1361 if (nfs_get_option_ul(args, &option))
1362 goto out_invalid_value;
1363 mnt->namlen = option;
1366 if (nfs_get_option_ul(args, &option) ||
1368 goto out_invalid_value;
1369 mnt->mount_server.port = option;
1372 if (nfs_get_option_ul(args, &option) ||
1373 option < NFS_MNT_VERSION ||
1374 option > NFS_MNT3_VERSION)
1375 goto out_invalid_value;
1376 mnt->mount_server.version = option;
1378 case Opt_minorversion:
1379 if (nfs_get_option_ul(args, &option))
1380 goto out_invalid_value;
1381 if (option > NFS4_MAX_MINOR_VERSION)
1382 goto out_invalid_value;
1383 mnt->minorversion = option;
1387 * options that take text values
1390 string = match_strdup(args);
1393 rc = nfs_parse_version_string(string, mnt, args);
1396 goto out_invalid_value;
1399 string = match_strdup(args);
1402 rc = nfs_parse_security_flavors(string, mnt);
1405 dfprintk(MOUNT, "NFS: unrecognized "
1406 "security flavor\n");
1411 string = match_strdup(args);
1414 token = match_token(string,
1415 nfs_xprt_protocol_tokens, args);
1417 protofamily = AF_INET;
1420 protofamily = AF_INET6;
1422 mnt->flags &= ~NFS_MOUNT_TCP;
1423 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1426 protofamily = AF_INET6;
1428 mnt->flags |= NFS_MOUNT_TCP;
1429 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1432 /* vector side protocols to TCP */
1433 mnt->flags |= NFS_MOUNT_TCP;
1434 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1435 xprt_load_transport(string);
1438 dfprintk(MOUNT, "NFS: unrecognized "
1439 "transport protocol\n");
1445 case Opt_mountproto:
1446 string = match_strdup(args);
1449 token = match_token(string,
1450 nfs_xprt_protocol_tokens, args);
1453 mountfamily = AF_INET;
1456 mountfamily = AF_INET6;
1458 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1461 mountfamily = AF_INET6;
1463 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1465 case Opt_xprt_rdma: /* not used for side protocols */
1467 dfprintk(MOUNT, "NFS: unrecognized "
1468 "transport protocol\n");
1473 string = match_strdup(args);
1476 mnt->nfs_server.addrlen =
1477 rpc_pton(mnt->net, string, strlen(string),
1479 &mnt->nfs_server.address,
1480 sizeof(mnt->nfs_server.address));
1482 if (mnt->nfs_server.addrlen == 0)
1483 goto out_invalid_address;
1485 case Opt_clientaddr:
1486 if (nfs_get_option_str(args, &mnt->client_address))
1490 if (nfs_get_option_str(args,
1491 &mnt->mount_server.hostname))
1495 string = match_strdup(args);
1498 mnt->mount_server.addrlen =
1499 rpc_pton(mnt->net, string, strlen(string),
1501 &mnt->mount_server.address,
1502 sizeof(mnt->mount_server.address));
1504 if (mnt->mount_server.addrlen == 0)
1505 goto out_invalid_address;
1507 case Opt_lookupcache:
1508 string = match_strdup(args);
1511 token = match_token(string,
1512 nfs_lookupcache_tokens, args);
1515 case Opt_lookupcache_all:
1516 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1518 case Opt_lookupcache_positive:
1519 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1520 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1522 case Opt_lookupcache_none:
1523 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1526 dfprintk(MOUNT, "NFS: invalid "
1527 "lookupcache argument\n");
1531 case Opt_fscache_uniq:
1532 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1534 mnt->options |= NFS_OPTION_FSCACHE;
1536 case Opt_local_lock:
1537 string = match_strdup(args);
1540 token = match_token(string, nfs_local_lock_tokens,
1544 case Opt_local_lock_all:
1545 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1546 NFS_MOUNT_LOCAL_FCNTL);
1548 case Opt_local_lock_flock:
1549 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1551 case Opt_local_lock_posix:
1552 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1554 case Opt_local_lock_none:
1555 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1556 NFS_MOUNT_LOCAL_FCNTL);
1559 dfprintk(MOUNT, "NFS: invalid "
1560 "local_lock argument\n");
1570 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1573 case Opt_deprecated:
1574 dfprintk(MOUNT, "NFS: ignoring mount option "
1580 dfprintk(MOUNT, "NFS: unrecognized mount option "
1585 if (!sloppy && invalid_option)
1588 if (mnt->minorversion && mnt->version != 4)
1589 goto out_minorversion_mismatch;
1592 * verify that any proto=/mountproto= options match the address
1593 * familiies in the addr=/mountaddr= options.
1595 if (protofamily != AF_UNSPEC &&
1596 protofamily != mnt->nfs_server.address.ss_family)
1597 goto out_proto_mismatch;
1599 if (mountfamily != AF_UNSPEC) {
1600 if (mnt->mount_server.addrlen) {
1601 if (mountfamily != mnt->mount_server.address.ss_family)
1602 goto out_mountproto_mismatch;
1604 if (mountfamily != mnt->nfs_server.address.ss_family)
1605 goto out_mountproto_mismatch;
1611 out_mountproto_mismatch:
1612 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1616 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1618 out_invalid_address:
1619 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1622 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1624 out_minorversion_mismatch:
1625 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1626 "minorversion=%u\n", mnt->version, mnt->minorversion);
1629 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1631 out_security_failure:
1632 free_secdata(secdata);
1633 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1638 * Match the requested auth flavors with the list returned by
1639 * the server. Returns zero and sets the mount's authentication
1640 * flavor on success; returns -EACCES if server does not support
1641 * the requested flavor.
1643 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1644 struct nfs_mount_request *request)
1646 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1649 * Certain releases of Linux's mountd return an empty
1650 * flavor list. To prevent behavioral regression with
1651 * these servers (ie. rejecting mounts that used to
1652 * succeed), revert to pre-2.6.32 behavior (no checking)
1653 * if the returned flavor list is empty.
1655 if (server_authlist_len == 0)
1659 * We avoid sophisticated negotiating here, as there are
1660 * plenty of cases where we can get it wrong, providing
1661 * either too little or too much security.
1663 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1664 * flavor listed first. However, some servers list
1665 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1666 * preferred default, in args->auth_flavors[0] if user
1667 * didn't specify sec= mount option.
1669 for (i = 0; i < args->auth_flavor_len; i++)
1670 for (j = 0; j < server_authlist_len; j++)
1671 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1672 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1673 request->auth_flavs[j]);
1674 args->auth_flavors[0] = request->auth_flavs[j];
1678 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1679 nfs_umount(request);
1684 * Use the remote server's MOUNT service to request the NFS file handle
1685 * corresponding to the provided path.
1687 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1688 struct nfs_fh *root_fh)
1690 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1691 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1692 struct nfs_mount_request request = {
1693 .sap = (struct sockaddr *)
1694 &args->mount_server.address,
1695 .dirpath = args->nfs_server.export_path,
1696 .protocol = args->mount_server.protocol,
1698 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1699 .auth_flav_len = &server_authlist_len,
1700 .auth_flavs = server_authlist,
1705 if (args->mount_server.version == 0) {
1706 switch (args->version) {
1708 args->mount_server.version = NFS_MNT3_VERSION;
1711 args->mount_server.version = NFS_MNT_VERSION;
1714 request.version = args->mount_server.version;
1716 if (args->mount_server.hostname)
1717 request.hostname = args->mount_server.hostname;
1719 request.hostname = args->nfs_server.hostname;
1722 * Construct the mount server's address.
1724 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1725 memcpy(request.sap, &args->nfs_server.address,
1726 args->nfs_server.addrlen);
1727 args->mount_server.addrlen = args->nfs_server.addrlen;
1729 request.salen = args->mount_server.addrlen;
1730 nfs_set_port(request.sap, &args->mount_server.port, 0);
1733 * Now ask the mount server to map our export path
1736 status = nfs_mount(&request);
1738 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1739 request.hostname, status);
1744 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1746 if (args->mount_server.version != NFS_MNT3_VERSION)
1748 return nfs_walk_authlist(args, &request);
1751 static struct dentry *nfs_try_mount(int flags, const char *dev_name,
1752 struct nfs_mount_info *mount_info)
1755 struct nfs_server *server;
1757 if (mount_info->parsed->need_mount) {
1758 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1760 return ERR_PTR(status);
1763 /* Get a volume representation */
1764 server = nfs_create_server(mount_info->parsed, mount_info->mntfh);
1766 return ERR_CAST(server);
1768 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info);
1772 * Split "dev_name" into "hostname:export_path".
1774 * The leftmost colon demarks the split between the server's hostname
1775 * and the export path. If the hostname starts with a left square
1776 * bracket, then it may contain colons.
1778 * Note: caller frees hostname and export path, even on error.
1780 static int nfs_parse_devname(const char *dev_name,
1781 char **hostname, size_t maxnamlen,
1782 char **export_path, size_t maxpathlen)
1787 /* Is the host name protected with square brakcets? */
1788 if (*dev_name == '[') {
1789 end = strchr(++dev_name, ']');
1790 if (end == NULL || end[1] != ':')
1791 goto out_bad_devname;
1793 len = end - dev_name;
1798 end = strchr(dev_name, ':');
1800 goto out_bad_devname;
1801 len = end - dev_name;
1803 /* kill possible hostname list: not supported */
1804 comma = strchr(dev_name, ',');
1805 if (comma != NULL && comma < end)
1809 if (len > maxnamlen)
1812 /* N.B. caller will free nfs_server.hostname in all cases */
1813 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1814 if (*hostname == NULL)
1816 len = strlen(++end);
1817 if (len > maxpathlen)
1819 *export_path = kstrndup(end, len, GFP_KERNEL);
1823 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1827 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1831 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1835 dfprintk(MOUNT, "NFS: server hostname too long\n");
1836 return -ENAMETOOLONG;
1839 dfprintk(MOUNT, "NFS: export pathname too long\n");
1840 return -ENAMETOOLONG;
1844 * Validate the NFS2/NFS3 mount data
1845 * - fills in the mount root filehandle
1847 * For option strings, user space handles the following behaviors:
1849 * + DNS: mapping server host name to IP address ("addr=" option)
1851 * + failure mode: how to behave if a mount request can't be handled
1852 * immediately ("fg/bg" option)
1854 * + retry: how often to retry a mount request ("retry=" option)
1856 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1857 * mountproto=tcp after mountproto=udp, and so on
1859 static int nfs23_validate_mount_data(void *options,
1860 struct nfs_parsed_mount_data *args,
1861 struct nfs_fh *mntfh,
1862 const char *dev_name)
1864 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1865 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1870 switch (data->version) {
1876 if (data->flags & NFS_MOUNT_VER3)
1878 data->root.size = NFS2_FHSIZE;
1879 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1881 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1884 memset(data->context, 0, sizeof(data->context));
1886 if (data->flags & NFS_MOUNT_VER3) {
1887 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1888 goto out_invalid_fh;
1889 mntfh->size = data->root.size;
1892 mntfh->size = NFS2_FHSIZE;
1897 memcpy(mntfh->data, data->root.data, mntfh->size);
1898 if (mntfh->size < sizeof(mntfh->data))
1899 memset(mntfh->data + mntfh->size, 0,
1900 sizeof(mntfh->data) - mntfh->size);
1903 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1906 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1907 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1908 args->rsize = data->rsize;
1909 args->wsize = data->wsize;
1910 args->timeo = data->timeo;
1911 args->retrans = data->retrans;
1912 args->acregmin = data->acregmin;
1913 args->acregmax = data->acregmax;
1914 args->acdirmin = data->acdirmin;
1915 args->acdirmax = data->acdirmax;
1916 args->need_mount = false;
1918 memcpy(sap, &data->addr, sizeof(data->addr));
1919 args->nfs_server.addrlen = sizeof(data->addr);
1920 if (!nfs_verify_server_address(sap))
1921 goto out_no_address;
1923 if (!(data->flags & NFS_MOUNT_TCP))
1924 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1925 /* N.B. caller will free nfs_server.hostname in all cases */
1926 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1927 args->namlen = data->namlen;
1928 args->bsize = data->bsize;
1930 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1931 args->auth_flavors[0] = data->pseudoflavor;
1932 if (!args->nfs_server.hostname)
1935 if (!(data->flags & NFS_MOUNT_NONLM))
1936 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1937 NFS_MOUNT_LOCAL_FCNTL);
1939 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1940 NFS_MOUNT_LOCAL_FCNTL);
1942 * The legacy version 6 binary mount data from userspace has a
1943 * field used only to transport selinux information into the
1944 * the kernel. To continue to support that functionality we
1945 * have a touch of selinux knowledge here in the NFS code. The
1946 * userspace code converted context=blah to just blah so we are
1947 * converting back to the full string selinux understands.
1949 if (data->context[0]){
1950 #ifdef CONFIG_SECURITY_SELINUX
1952 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1955 strcpy(opts_str, "context=");
1956 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1957 strcat(opts_str, &data->context[0]);
1958 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1969 return NFS_TEXT_DATA;
1972 #ifndef CONFIG_NFS_V3
1973 if (args->version == 3)
1974 goto out_v3_not_compiled;
1975 #endif /* !CONFIG_NFS_V3 */
1980 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1984 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1989 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1992 #ifndef CONFIG_NFS_V3
1993 out_v3_not_compiled:
1994 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1995 return -EPROTONOSUPPORT;
1996 #endif /* !CONFIG_NFS_V3 */
1999 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2003 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2007 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2011 #ifdef CONFIG_NFS_V4
2012 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2014 struct nfs_parsed_mount_data *args,
2015 struct nfs_fh *mntfh,
2016 const char *dev_name)
2018 if (fs_type == &nfs_fs_type)
2019 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2020 return nfs4_validate_mount_data(options, args, dev_name);
2023 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2025 struct nfs_parsed_mount_data *args,
2026 struct nfs_fh *mntfh,
2027 const char *dev_name)
2029 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2033 static int nfs_validate_text_mount_data(void *options,
2034 struct nfs_parsed_mount_data *args,
2035 const char *dev_name)
2038 int max_namelen = PAGE_SIZE;
2039 int max_pathlen = NFS_MAXPATHLEN;
2040 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2042 if (nfs_parse_mount_options((char *)options, args) == 0)
2045 if (!nfs_verify_server_address(sap))
2046 goto out_no_address;
2048 if (args->version == 4) {
2049 #ifdef CONFIG_NFS_V4
2051 max_namelen = NFS4_MAXNAMLEN;
2052 max_pathlen = NFS4_MAXPATHLEN;
2053 nfs_validate_transport_protocol(args);
2054 nfs4_validate_mount_flags(args);
2056 goto out_v4_not_compiled;
2057 #endif /* CONFIG_NFS_V4 */
2059 nfs_set_mount_transport_protocol(args);
2061 nfs_set_port(sap, &args->nfs_server.port, port);
2063 if (args->auth_flavor_len > 1)
2066 return nfs_parse_devname(dev_name,
2067 &args->nfs_server.hostname,
2069 &args->nfs_server.export_path,
2072 #ifndef CONFIG_NFS_V4
2073 out_v4_not_compiled:
2074 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2075 return -EPROTONOSUPPORT;
2076 #endif /* !CONFIG_NFS_V4 */
2079 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2083 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2088 nfs_compare_remount_data(struct nfs_server *nfss,
2089 struct nfs_parsed_mount_data *data)
2091 if (data->flags != nfss->flags ||
2092 data->rsize != nfss->rsize ||
2093 data->wsize != nfss->wsize ||
2094 data->retrans != nfss->client->cl_timeout->to_retries ||
2095 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2096 data->acregmin != nfss->acregmin / HZ ||
2097 data->acregmax != nfss->acregmax / HZ ||
2098 data->acdirmin != nfss->acdirmin / HZ ||
2099 data->acdirmax != nfss->acdirmax / HZ ||
2100 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2101 data->nfs_server.port != nfss->port ||
2102 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2103 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2104 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2111 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2114 struct nfs_server *nfss = sb->s_fs_info;
2115 struct nfs_parsed_mount_data *data;
2116 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2117 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2118 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2121 * Userspace mount programs that send binary options generally send
2122 * them populated with default values. We have no way to know which
2123 * ones were explicitly specified. Fall back to legacy behavior and
2124 * just return success.
2126 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2127 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2128 options->version <= 6))))
2131 data = kzalloc(sizeof(*data), GFP_KERNEL);
2135 /* fill out struct with values from existing mount */
2136 data->flags = nfss->flags;
2137 data->rsize = nfss->rsize;
2138 data->wsize = nfss->wsize;
2139 data->retrans = nfss->client->cl_timeout->to_retries;
2140 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2141 data->acregmin = nfss->acregmin / HZ;
2142 data->acregmax = nfss->acregmax / HZ;
2143 data->acdirmin = nfss->acdirmin / HZ;
2144 data->acdirmax = nfss->acdirmax / HZ;
2145 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2146 data->nfs_server.port = nfss->port;
2147 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2148 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2149 data->nfs_server.addrlen);
2151 /* overwrite those values with any that were specified */
2152 error = nfs_parse_mount_options((char *)options, data);
2157 * noac is a special case. It implies -o sync, but that's not
2158 * necessarily reflected in the mtab options. do_remount_sb
2159 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2160 * remount options, so we have to explicitly reset it.
2162 if (data->flags & NFS_MOUNT_NOAC)
2163 *flags |= MS_SYNCHRONOUS;
2165 /* compare new mount options with old ones */
2166 error = nfs_compare_remount_data(nfss, data);
2173 * Initialise the common bits of the superblock
2175 static inline void nfs_initialise_sb(struct super_block *sb)
2177 struct nfs_server *server = NFS_SB(sb);
2179 sb->s_magic = NFS_SUPER_MAGIC;
2181 /* We probably want something more informative here */
2182 snprintf(sb->s_id, sizeof(sb->s_id),
2183 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2185 if (sb->s_blocksize == 0)
2186 sb->s_blocksize = nfs_block_bits(server->wsize,
2187 &sb->s_blocksize_bits);
2189 sb->s_bdi = &server->backing_dev_info;
2191 nfs_super_set_maxbytes(sb, server->maxfilesize);
2195 * Finish setting up an NFS2/3 superblock
2197 static void nfs_fill_super(struct super_block *sb,
2198 struct nfs_mount_info *mount_info)
2200 struct nfs_parsed_mount_data *data = mount_info->parsed;
2201 struct nfs_server *server = NFS_SB(sb);
2203 sb->s_blocksize_bits = 0;
2204 sb->s_blocksize = 0;
2206 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2208 if (server->nfs_client->rpc_ops->version == 3) {
2209 /* The VFS shouldn't apply the umask to mode bits. We will do
2210 * so ourselves when necessary.
2212 sb->s_flags |= MS_POSIXACL;
2213 sb->s_time_gran = 1;
2216 sb->s_op = &nfs_sops;
2217 nfs_initialise_sb(sb);
2221 * Finish setting up a cloned NFS2/3 superblock
2223 static void nfs_clone_super(struct super_block *sb,
2224 struct nfs_mount_info *mount_info)
2226 const struct super_block *old_sb = mount_info->cloned->sb;
2227 struct nfs_server *server = NFS_SB(sb);
2229 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2230 sb->s_blocksize = old_sb->s_blocksize;
2231 sb->s_maxbytes = old_sb->s_maxbytes;
2233 if (server->nfs_client->rpc_ops->version == 3) {
2234 /* The VFS shouldn't apply the umask to mode bits. We will do
2235 * so ourselves when necessary.
2237 sb->s_flags |= MS_POSIXACL;
2238 sb->s_time_gran = 1;
2241 sb->s_op = old_sb->s_op;
2242 nfs_initialise_sb(sb);
2245 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2247 const struct nfs_server *a = s->s_fs_info;
2248 const struct rpc_clnt *clnt_a = a->client;
2249 const struct rpc_clnt *clnt_b = b->client;
2251 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2253 if (a->nfs_client != b->nfs_client)
2255 if (a->flags != b->flags)
2257 if (a->wsize != b->wsize)
2259 if (a->rsize != b->rsize)
2261 if (a->acregmin != b->acregmin)
2263 if (a->acregmax != b->acregmax)
2265 if (a->acdirmin != b->acdirmin)
2267 if (a->acdirmax != b->acdirmax)
2269 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2276 struct nfs_sb_mountdata {
2277 struct nfs_server *server;
2281 static int nfs_set_super(struct super_block *s, void *data)
2283 struct nfs_sb_mountdata *sb_mntdata = data;
2284 struct nfs_server *server = sb_mntdata->server;
2287 s->s_flags = sb_mntdata->mntflags;
2288 s->s_fs_info = server;
2289 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2290 ret = set_anon_super(s, server);
2292 server->s_dev = s->s_dev;
2296 static int nfs_compare_super_address(struct nfs_server *server1,
2297 struct nfs_server *server2)
2299 struct sockaddr *sap1, *sap2;
2301 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2302 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2304 if (sap1->sa_family != sap2->sa_family)
2307 switch (sap1->sa_family) {
2309 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2310 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2311 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2313 if (sin1->sin_port != sin2->sin_port)
2318 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2319 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2320 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2322 if (sin1->sin6_port != sin2->sin6_port)
2333 static int nfs_compare_super(struct super_block *sb, void *data)
2335 struct nfs_sb_mountdata *sb_mntdata = data;
2336 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2337 int mntflags = sb_mntdata->mntflags;
2339 if (!nfs_compare_super_address(old, server))
2341 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2342 if (old->flags & NFS_MOUNT_UNSHARED)
2344 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2346 return nfs_compare_mount_options(sb, server, mntflags);
2349 #ifdef CONFIG_NFS_FSCACHE
2350 static void nfs_get_cache_cookie(struct super_block *sb,
2351 struct nfs_parsed_mount_data *parsed,
2352 struct nfs_clone_mount *cloned)
2357 if (parsed && parsed->fscache_uniq) {
2358 uniq = parsed->fscache_uniq;
2359 ulen = strlen(parsed->fscache_uniq);
2360 } else if (cloned) {
2361 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2362 if (mnt_s->fscache_key) {
2363 uniq = mnt_s->fscache_key->key.uniquifier;
2364 ulen = mnt_s->fscache_key->key.uniq_len;
2368 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2371 static void nfs_get_cache_cookie(struct super_block *sb,
2372 struct nfs_parsed_mount_data *parsed,
2373 struct nfs_clone_mount *cloned)
2378 static int nfs_bdi_register(struct nfs_server *server)
2380 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2383 static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2384 struct nfs_mount_info *mount_info)
2386 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2389 static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2390 struct nfs_mount_info *mount_info)
2392 /* clone any lsm security options from the parent to the new sb */
2393 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2394 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2399 static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2400 struct nfs_server *server,
2401 int flags, const char *dev_name,
2402 struct nfs_mount_info *mount_info)
2404 struct super_block *s;
2405 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2406 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2407 struct nfs_sb_mountdata sb_mntdata = {
2413 if (server->flags & NFS_MOUNT_UNSHARED)
2414 compare_super = NULL;
2416 /* -o noac implies -o sync */
2417 if (server->flags & NFS_MOUNT_NOAC)
2418 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2420 /* Get a superblock - note that we may end up sharing one that already exists */
2421 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2423 mntroot = ERR_CAST(s);
2427 if (s->s_fs_info != server) {
2428 nfs_free_server(server);
2431 error = nfs_bdi_register(server);
2433 mntroot = ERR_PTR(error);
2434 goto error_splat_bdi;
2439 /* initial superblock/root creation */
2440 mount_info->fill_super(s, mount_info);
2441 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2444 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2445 if (IS_ERR(mntroot))
2446 goto error_splat_super;
2448 error = mount_info->set_security(s, mntroot, mount_info);
2450 goto error_splat_root;
2452 s->s_flags |= MS_ACTIVE;
2458 nfs_free_server(server);
2463 mntroot = ERR_PTR(error);
2465 if (server && !s->s_root)
2466 bdi_unregister(&server->backing_dev_info);
2468 deactivate_locked_super(s);
2472 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2473 int flags, const char *dev_name, void *raw_data)
2475 struct nfs_mount_info mount_info = {
2476 .fill_super = nfs_fill_super,
2477 .set_security = nfs_set_sb_security,
2479 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2482 mount_info.parsed = nfs_alloc_parsed_mount_data();
2483 mount_info.mntfh = nfs_alloc_fhandle();
2484 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2487 /* Validate the mount data */
2488 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2489 if (error == NFS_TEXT_DATA)
2490 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2492 mntroot = ERR_PTR(error);
2496 #ifdef CONFIG_NFS_V4
2497 if (mount_info.parsed->version == 4)
2498 mntroot = nfs4_try_mount(flags, dev_name, &mount_info);
2500 #endif /* CONFIG_NFS_V4 */
2501 mntroot = nfs_try_mount(flags, dev_name, &mount_info);
2504 nfs_free_parsed_mount_data(mount_info.parsed);
2505 nfs_free_fhandle(mount_info.mntfh);
2510 * Ensure that we unregister the bdi before kill_anon_super
2511 * releases the device name
2513 static void nfs_put_super(struct super_block *s)
2515 struct nfs_server *server = NFS_SB(s);
2517 bdi_unregister(&server->backing_dev_info);
2521 * Destroy an NFS2/3 superblock
2523 static void nfs_kill_super(struct super_block *s)
2525 struct nfs_server *server = NFS_SB(s);
2528 nfs_fscache_release_super_cookie(s);
2529 nfs_free_server(server);
2533 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2535 static struct dentry *
2536 nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2537 const char *dev_name, struct nfs_mount_info *mount_info)
2539 struct nfs_clone_mount *data = mount_info->cloned;
2540 struct nfs_server *server;
2541 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2544 dprintk("--> nfs_xdev_mount_common()\n");
2546 mount_info->mntfh = data->fh;
2548 /* create a new volume representation */
2549 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2550 if (IS_ERR(server)) {
2551 error = PTR_ERR(server);
2555 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
2556 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2561 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
2566 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2568 static struct dentry *
2569 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2570 const char *dev_name, void *raw_data)
2572 struct nfs_mount_info mount_info = {
2573 .fill_super = nfs_clone_super,
2574 .set_security = nfs_clone_sb_security,
2577 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2580 #ifdef CONFIG_NFS_V4
2583 * Finish setting up a cloned NFS4 superblock
2585 static void nfs4_clone_super(struct super_block *sb,
2586 struct nfs_mount_info *mount_info)
2588 const struct super_block *old_sb = mount_info->cloned->sb;
2589 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2590 sb->s_blocksize = old_sb->s_blocksize;
2591 sb->s_maxbytes = old_sb->s_maxbytes;
2592 sb->s_time_gran = 1;
2593 sb->s_op = old_sb->s_op;
2595 * The VFS shouldn't apply the umask to mode bits. We will do
2596 * so ourselves when necessary.
2598 sb->s_flags |= MS_POSIXACL;
2599 sb->s_xattr = old_sb->s_xattr;
2600 nfs_initialise_sb(sb);
2604 * Set up an NFS4 superblock
2606 static void nfs4_fill_super(struct super_block *sb,
2607 struct nfs_mount_info *mount_info)
2609 sb->s_time_gran = 1;
2610 sb->s_op = &nfs4_sops;
2612 * The VFS shouldn't apply the umask to mode bits. We will do
2613 * so ourselves when necessary.
2615 sb->s_flags |= MS_POSIXACL;
2616 sb->s_xattr = nfs4_xattr_handlers;
2617 nfs_initialise_sb(sb);
2620 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2622 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2623 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2627 * Validate NFSv4 mount options
2629 static int nfs4_validate_mount_data(void *options,
2630 struct nfs_parsed_mount_data *args,
2631 const char *dev_name)
2633 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2634 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2642 switch (data->version) {
2644 if (data->host_addrlen > sizeof(args->nfs_server.address))
2645 goto out_no_address;
2646 if (data->host_addrlen == 0)
2647 goto out_no_address;
2648 args->nfs_server.addrlen = data->host_addrlen;
2649 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2651 if (!nfs_verify_server_address(sap))
2652 goto out_no_address;
2654 if (data->auth_flavourlen) {
2655 if (data->auth_flavourlen > 1)
2656 goto out_inval_auth;
2657 if (copy_from_user(&args->auth_flavors[0],
2658 data->auth_flavours,
2659 sizeof(args->auth_flavors[0])))
2663 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2666 args->nfs_server.hostname = c;
2668 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2671 args->nfs_server.export_path = c;
2672 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2674 c = strndup_user(data->client_addr.data, 16);
2677 args->client_address = c;
2680 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2684 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2685 args->rsize = data->rsize;
2686 args->wsize = data->wsize;
2687 args->timeo = data->timeo;
2688 args->retrans = data->retrans;
2689 args->acregmin = data->acregmin;
2690 args->acregmax = data->acregmax;
2691 args->acdirmin = data->acdirmin;
2692 args->acdirmax = data->acdirmax;
2693 args->nfs_server.protocol = data->proto;
2694 nfs_validate_transport_protocol(args);
2698 return NFS_TEXT_DATA;
2704 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2708 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2709 data->auth_flavourlen);
2713 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2718 * Get the superblock for the NFS4 root partition
2720 static struct dentry *
2721 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2722 const char *dev_name, void *info)
2724 struct nfs_mount_info *mount_info = info;
2725 struct nfs_server *server;
2726 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2728 mount_info->fill_super = nfs4_fill_super;
2729 mount_info->set_security = nfs_set_sb_security;
2731 /* Get a volume representation */
2732 server = nfs4_create_server(mount_info->parsed, mount_info->mntfh);
2733 if (IS_ERR(server)) {
2734 mntroot = ERR_CAST(server);
2738 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
2744 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2745 int flags, void *data, const char *hostname)
2747 struct vfsmount *root_mnt;
2751 len = strlen(hostname) + 5;
2752 root_devname = kmalloc(len, GFP_KERNEL);
2753 if (root_devname == NULL)
2754 return ERR_PTR(-ENOMEM);
2755 /* Does hostname needs to be enclosed in brackets? */
2756 if (strchr(hostname, ':'))
2757 snprintf(root_devname, len, "[%s]:/", hostname);
2759 snprintf(root_devname, len, "%s:/", hostname);
2760 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2761 kfree(root_devname);
2765 struct nfs_referral_count {
2766 struct list_head list;
2767 const struct task_struct *task;
2768 unsigned int referral_count;
2771 static LIST_HEAD(nfs_referral_count_list);
2772 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2774 static struct nfs_referral_count *nfs_find_referral_count(void)
2776 struct nfs_referral_count *p;
2778 list_for_each_entry(p, &nfs_referral_count_list, list) {
2779 if (p->task == current)
2785 #define NFS_MAX_NESTED_REFERRALS 2
2787 static int nfs_referral_loop_protect(void)
2789 struct nfs_referral_count *p, *new;
2792 new = kmalloc(sizeof(*new), GFP_KERNEL);
2795 new->task = current;
2796 new->referral_count = 1;
2799 spin_lock(&nfs_referral_count_list_lock);
2800 p = nfs_find_referral_count();
2802 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2805 p->referral_count++;
2807 list_add(&new->list, &nfs_referral_count_list);
2810 spin_unlock(&nfs_referral_count_list_lock);
2816 static void nfs_referral_loop_unprotect(void)
2818 struct nfs_referral_count *p;
2820 spin_lock(&nfs_referral_count_list_lock);
2821 p = nfs_find_referral_count();
2822 p->referral_count--;
2823 if (p->referral_count == 0)
2827 spin_unlock(&nfs_referral_count_list_lock);
2831 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2832 const char *export_path)
2834 struct dentry *dentry;
2837 if (IS_ERR(root_mnt))
2838 return ERR_CAST(root_mnt);
2840 err = nfs_referral_loop_protect();
2843 return ERR_PTR(err);
2846 dentry = mount_subtree(root_mnt, export_path);
2847 nfs_referral_loop_unprotect();
2852 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2853 struct nfs_mount_info *mount_info)
2856 struct vfsmount *root_mnt;
2858 struct nfs_parsed_mount_data *data = mount_info->parsed;
2860 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2862 export_path = data->nfs_server.export_path;
2863 data->nfs_server.export_path = "/";
2864 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info,
2865 data->nfs_server.hostname);
2866 data->nfs_server.export_path = export_path;
2868 res = nfs_follow_remote_path(root_mnt, export_path);
2870 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2871 IS_ERR(res) ? PTR_ERR(res) : 0,
2872 IS_ERR(res) ? " [error]" : "");
2876 static void nfs4_kill_super(struct super_block *sb)
2878 struct nfs_server *server = NFS_SB(sb);
2880 dprintk("--> %s\n", __func__);
2881 nfs_super_return_all_delegations(sb);
2882 kill_anon_super(sb);
2883 nfs_fscache_release_super_cookie(sb);
2884 nfs_free_server(server);
2885 dprintk("<-- %s\n", __func__);
2889 * Clone an NFS4 server record on xdev traversal (FSID-change)
2891 static struct dentry *
2892 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2893 const char *dev_name, void *raw_data)
2895 struct nfs_mount_info mount_info = {
2896 .fill_super = nfs4_clone_super,
2897 .set_security = nfs_clone_sb_security,
2900 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
2903 static struct dentry *
2904 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2905 const char *dev_name, void *raw_data)
2907 struct nfs_mount_info mount_info = {
2908 .fill_super = nfs4_fill_super,
2909 .set_security = nfs_clone_sb_security,
2912 struct nfs_server *server;
2913 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2915 dprintk("--> nfs4_referral_get_sb()\n");
2917 mount_info.mntfh = nfs_alloc_fhandle();
2918 if (mount_info.cloned == NULL || mount_info.mntfh == NULL)
2921 /* create a new volume representation */
2922 server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh);
2923 if (IS_ERR(server)) {
2924 mntroot = ERR_CAST(server);
2928 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, &mount_info);
2930 nfs_free_fhandle(mount_info.mntfh);
2935 * Create an NFS4 server record on referral traversal
2937 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2938 int flags, const char *dev_name, void *raw_data)
2940 struct nfs_clone_mount *data = raw_data;
2942 struct vfsmount *root_mnt;
2945 dprintk("--> nfs4_referral_mount()\n");
2947 export_path = data->mnt_path;
2948 data->mnt_path = "/";
2950 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2951 flags, data, data->hostname);
2952 data->mnt_path = export_path;
2954 res = nfs_follow_remote_path(root_mnt, export_path);
2955 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2956 IS_ERR(res) ? PTR_ERR(res) : 0,
2957 IS_ERR(res) ? " [error]" : "");
2961 #endif /* CONFIG_NFS_V4 */