4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/mnt_namespace.h>
46 #include <linux/namei.h>
47 #include <linux/nfs_idmap.h>
48 #include <linux/vfs.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/slab.h>
53 #include <linux/netdevice.h>
54 #include <linux/nfs_xdr.h>
55 #include <linux/magic.h>
56 #include <linux/parser.h>
58 #include <asm/system.h>
59 #include <asm/uaccess.h>
63 #include "delegation.h"
68 #define NFSDBG_FACILITY NFSDBG_VFS
71 /* Mount options that take no arguments */
73 Opt_posix, Opt_noposix,
77 Opt_v2, Opt_v3, Opt_v4,
78 Opt_udp, Opt_tcp, Opt_rdma,
80 Opt_rdirplus, Opt_nordirplus,
81 Opt_sharecache, Opt_nosharecache,
82 Opt_resvport, Opt_noresvport,
83 Opt_fscache, Opt_nofscache,
85 /* Mount options that take integer arguments */
87 Opt_rsize, Opt_wsize, Opt_bsize,
88 Opt_timeo, Opt_retrans,
89 Opt_acregmin, Opt_acregmax,
90 Opt_acdirmin, Opt_acdirmax,
98 /* Mount options that take string arguments */
99 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
100 Opt_addr, Opt_mountaddr, Opt_clientaddr,
105 /* Special mount options */
106 Opt_userspace, Opt_deprecated, Opt_sloppy,
111 static const match_table_t nfs_mount_option_tokens = {
112 { Opt_userspace, "bg" },
113 { Opt_userspace, "fg" },
114 { Opt_userspace, "retry=%s" },
116 { Opt_sloppy, "sloppy" },
118 { Opt_soft, "soft" },
119 { Opt_hard, "hard" },
120 { Opt_deprecated, "intr" },
121 { Opt_deprecated, "nointr" },
122 { Opt_posix, "posix" },
123 { Opt_noposix, "noposix" },
125 { Opt_nocto, "nocto" },
127 { Opt_noac, "noac" },
128 { Opt_lock, "lock" },
129 { Opt_nolock, "nolock" },
135 { Opt_rdma, "rdma" },
137 { Opt_noacl, "noacl" },
138 { Opt_rdirplus, "rdirplus" },
139 { Opt_nordirplus, "nordirplus" },
140 { Opt_sharecache, "sharecache" },
141 { Opt_nosharecache, "nosharecache" },
142 { Opt_resvport, "resvport" },
143 { Opt_noresvport, "noresvport" },
144 { Opt_fscache, "fsc" },
145 { Opt_nofscache, "nofsc" },
147 { Opt_port, "port=%s" },
148 { Opt_rsize, "rsize=%s" },
149 { Opt_wsize, "wsize=%s" },
150 { Opt_bsize, "bsize=%s" },
151 { Opt_timeo, "timeo=%s" },
152 { Opt_retrans, "retrans=%s" },
153 { Opt_acregmin, "acregmin=%s" },
154 { Opt_acregmax, "acregmax=%s" },
155 { Opt_acdirmin, "acdirmin=%s" },
156 { Opt_acdirmax, "acdirmax=%s" },
157 { Opt_actimeo, "actimeo=%s" },
158 { Opt_namelen, "namlen=%s" },
159 { Opt_mountport, "mountport=%s" },
160 { Opt_mountvers, "mountvers=%s" },
161 { Opt_nfsvers, "nfsvers=%s" },
162 { Opt_nfsvers, "vers=%s" },
163 { Opt_minorversion, "minorversion=%s" },
165 { Opt_sec, "sec=%s" },
166 { Opt_proto, "proto=%s" },
167 { Opt_mountproto, "mountproto=%s" },
168 { Opt_addr, "addr=%s" },
169 { Opt_clientaddr, "clientaddr=%s" },
170 { Opt_mounthost, "mounthost=%s" },
171 { Opt_mountaddr, "mountaddr=%s" },
173 { Opt_lookupcache, "lookupcache=%s" },
174 { Opt_fscache_uniq, "fsc=%s" },
175 { Opt_local_lock, "local_lock=%s" },
181 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
186 static const match_table_t nfs_xprt_protocol_tokens = {
187 { Opt_xprt_udp, "udp" },
188 { Opt_xprt_udp6, "udp6" },
189 { Opt_xprt_tcp, "tcp" },
190 { Opt_xprt_tcp6, "tcp6" },
191 { Opt_xprt_rdma, "rdma" },
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 const 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_spkm, "spkm3" },
219 { Opt_sec_spkmi, "spkm3i" },
220 { Opt_sec_spkmp, "spkm3p" },
222 { Opt_sec_err, NULL }
226 Opt_lookupcache_all, Opt_lookupcache_positive,
227 Opt_lookupcache_none,
232 static match_table_t nfs_lookupcache_tokens = {
233 { Opt_lookupcache_all, "all" },
234 { Opt_lookupcache_positive, "pos" },
235 { Opt_lookupcache_positive, "positive" },
236 { Opt_lookupcache_none, "none" },
238 { Opt_lookupcache_err, NULL }
242 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
248 static match_table_t nfs_local_lock_tokens = {
249 { Opt_local_lock_all, "all" },
250 { Opt_local_lock_flock, "flock" },
251 { Opt_local_lock_posix, "posix" },
252 { Opt_local_lock_none, "none" },
254 { Opt_local_lock_err, NULL }
258 static void nfs_umount_begin(struct super_block *);
259 static int nfs_statfs(struct dentry *, struct kstatfs *);
260 static int nfs_show_options(struct seq_file *, struct vfsmount *);
261 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
262 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
263 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
264 int flags, const char *dev_name, void *raw_data);
265 static void nfs_put_super(struct super_block *);
266 static void nfs_kill_super(struct super_block *);
267 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
269 static struct file_system_type nfs_fs_type = {
270 .owner = THIS_MODULE,
272 .get_sb = nfs_get_sb,
273 .kill_sb = nfs_kill_super,
274 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
277 struct file_system_type nfs_xdev_fs_type = {
278 .owner = THIS_MODULE,
280 .mount = nfs_xdev_mount,
281 .kill_sb = nfs_kill_super,
282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
285 static const struct super_operations nfs_sops = {
286 .alloc_inode = nfs_alloc_inode,
287 .destroy_inode = nfs_destroy_inode,
288 .write_inode = nfs_write_inode,
289 .put_super = nfs_put_super,
290 .statfs = nfs_statfs,
291 .evict_inode = nfs_evict_inode,
292 .umount_begin = nfs_umount_begin,
293 .show_options = nfs_show_options,
294 .show_stats = nfs_show_stats,
295 .remount_fs = nfs_remount,
299 static int nfs4_validate_text_mount_data(void *options,
300 struct nfs_parsed_mount_data *args, const char *dev_name);
301 static int nfs4_try_mount(int flags, const char *dev_name,
302 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
303 static int nfs4_get_sb(struct file_system_type *fs_type,
304 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
305 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
306 int flags, const char *dev_name, void *raw_data);
307 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
308 int flags, const char *dev_name, void *raw_data);
309 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
310 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
311 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
312 int flags, const char *dev_name, void *raw_data);
313 static void nfs4_kill_super(struct super_block *sb);
315 static struct file_system_type nfs4_fs_type = {
316 .owner = THIS_MODULE,
318 .get_sb = nfs4_get_sb,
319 .kill_sb = nfs4_kill_super,
320 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
323 static struct file_system_type nfs4_remote_fs_type = {
324 .owner = THIS_MODULE,
326 .mount = nfs4_remote_mount,
327 .kill_sb = nfs4_kill_super,
328 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
331 struct file_system_type nfs4_xdev_fs_type = {
332 .owner = THIS_MODULE,
334 .mount = nfs4_xdev_mount,
335 .kill_sb = nfs4_kill_super,
336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
339 static struct file_system_type nfs4_remote_referral_fs_type = {
340 .owner = THIS_MODULE,
342 .mount = nfs4_remote_referral_mount,
343 .kill_sb = nfs4_kill_super,
344 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
347 struct file_system_type nfs4_referral_fs_type = {
348 .owner = THIS_MODULE,
350 .get_sb = nfs4_referral_get_sb,
351 .kill_sb = nfs4_kill_super,
352 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
355 static const struct super_operations nfs4_sops = {
356 .alloc_inode = nfs_alloc_inode,
357 .destroy_inode = nfs_destroy_inode,
358 .write_inode = nfs_write_inode,
359 .put_super = nfs_put_super,
360 .statfs = nfs_statfs,
361 .evict_inode = nfs4_evict_inode,
362 .umount_begin = nfs_umount_begin,
363 .show_options = nfs_show_options,
364 .show_stats = nfs_show_stats,
365 .remount_fs = nfs_remount,
369 static struct shrinker acl_shrinker = {
370 .shrink = nfs_access_cache_shrinker,
371 .seeks = DEFAULT_SEEKS,
375 * Register the NFS filesystems
377 int __init register_nfs_fs(void)
381 ret = register_filesystem(&nfs_fs_type);
385 ret = nfs_register_sysctl();
389 ret = register_filesystem(&nfs4_fs_type);
393 register_shrinker(&acl_shrinker);
398 nfs_unregister_sysctl();
401 unregister_filesystem(&nfs_fs_type);
407 * Unregister the NFS filesystems
409 void __exit unregister_nfs_fs(void)
411 unregister_shrinker(&acl_shrinker);
413 unregister_filesystem(&nfs4_fs_type);
415 nfs_unregister_sysctl();
416 unregister_filesystem(&nfs_fs_type);
419 void nfs_sb_active(struct super_block *sb)
421 struct nfs_server *server = NFS_SB(sb);
423 if (atomic_inc_return(&server->active) == 1)
424 atomic_inc(&sb->s_active);
427 void nfs_sb_deactive(struct super_block *sb)
429 struct nfs_server *server = NFS_SB(sb);
431 if (atomic_dec_and_test(&server->active))
432 deactivate_super(sb);
436 * Deliver file system statistics to userspace
438 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
440 struct nfs_server *server = NFS_SB(dentry->d_sb);
441 unsigned char blockbits;
442 unsigned long blockres;
443 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
444 struct nfs_fsstat res;
447 res.fattr = nfs_alloc_fattr();
448 if (res.fattr == NULL)
451 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
452 if (unlikely(error == -ESTALE)) {
453 struct dentry *pd_dentry;
455 pd_dentry = dget_parent(dentry);
456 if (pd_dentry != NULL) {
457 nfs_zap_caches(pd_dentry->d_inode);
461 nfs_free_fattr(res.fattr);
465 buf->f_type = NFS_SUPER_MAGIC;
468 * Current versions of glibc do not correctly handle the
469 * case where f_frsize != f_bsize. Eventually we want to
470 * report the value of wtmult in this field.
472 buf->f_frsize = dentry->d_sb->s_blocksize;
475 * On most *nix systems, f_blocks, f_bfree, and f_bavail
476 * are reported in units of f_frsize. Linux hasn't had
477 * an f_frsize field in its statfs struct until recently,
478 * thus historically Linux's sys_statfs reports these
479 * fields in units of f_bsize.
481 buf->f_bsize = dentry->d_sb->s_blocksize;
482 blockbits = dentry->d_sb->s_blocksize_bits;
483 blockres = (1 << blockbits) - 1;
484 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
485 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
486 buf->f_bavail = (res.abytes + blockres) >> blockbits;
488 buf->f_files = res.tfiles;
489 buf->f_ffree = res.afiles;
491 buf->f_namelen = server->namelen;
496 dprintk("%s: statfs error = %d\n", __func__, -error);
501 * Map the security flavour number to a name
503 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
505 static const struct {
506 rpc_authflavor_t flavour;
509 { RPC_AUTH_NULL, "null" },
510 { RPC_AUTH_UNIX, "sys" },
511 { RPC_AUTH_GSS_KRB5, "krb5" },
512 { RPC_AUTH_GSS_KRB5I, "krb5i" },
513 { RPC_AUTH_GSS_KRB5P, "krb5p" },
514 { RPC_AUTH_GSS_LKEY, "lkey" },
515 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
516 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
517 { RPC_AUTH_GSS_SPKM, "spkm" },
518 { RPC_AUTH_GSS_SPKMI, "spkmi" },
519 { RPC_AUTH_GSS_SPKMP, "spkmp" },
520 { UINT_MAX, "unknown" }
524 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
525 if (sec_flavours[i].flavour == flavour)
528 return sec_flavours[i].str;
531 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
534 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
536 seq_printf(m, ",mountproto=");
537 switch (sap->sa_family) {
539 switch (nfss->mountd_protocol) {
541 seq_printf(m, RPCBIND_NETID_UDP);
544 seq_printf(m, RPCBIND_NETID_TCP);
548 seq_printf(m, "auto");
552 switch (nfss->mountd_protocol) {
554 seq_printf(m, RPCBIND_NETID_UDP6);
557 seq_printf(m, RPCBIND_NETID_TCP6);
561 seq_printf(m, "auto");
566 seq_printf(m, "auto");
570 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
573 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
575 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
578 switch (sap->sa_family) {
580 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
581 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
585 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
586 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
591 seq_printf(m, ",mountaddr=unspecified");
594 if (nfss->mountd_version || showdefaults)
595 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
596 if (nfss->mountd_port || showdefaults)
597 seq_printf(m, ",mountport=%u", nfss->mountd_port);
599 nfs_show_mountd_netid(m, nfss, showdefaults);
603 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
606 struct nfs_client *clp = nfss->nfs_client;
608 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
609 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
612 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
619 * Describe the mount options in force on this server representation
621 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
624 static const struct proc_nfs_info {
629 { NFS_MOUNT_SOFT, ",soft", ",hard" },
630 { NFS_MOUNT_POSIX, ",posix", "" },
631 { NFS_MOUNT_NOCTO, ",nocto", "" },
632 { NFS_MOUNT_NOAC, ",noac", "" },
633 { NFS_MOUNT_NONLM, ",nolock", "" },
634 { NFS_MOUNT_NOACL, ",noacl", "" },
635 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
636 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
637 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
640 const struct proc_nfs_info *nfs_infop;
641 struct nfs_client *clp = nfss->nfs_client;
642 u32 version = clp->rpc_ops->version;
643 int local_flock, local_fcntl;
645 seq_printf(m, ",vers=%u", version);
646 seq_printf(m, ",rsize=%u", nfss->rsize);
647 seq_printf(m, ",wsize=%u", nfss->wsize);
648 if (nfss->bsize != 0)
649 seq_printf(m, ",bsize=%u", nfss->bsize);
650 seq_printf(m, ",namlen=%u", nfss->namelen);
651 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
652 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
653 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
654 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
655 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
656 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
657 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
658 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
659 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
660 if (nfss->flags & nfs_infop->flag)
661 seq_puts(m, nfs_infop->str);
663 seq_puts(m, nfs_infop->nostr);
665 seq_printf(m, ",proto=%s",
666 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
668 if (nfss->port != NFS_PORT)
669 seq_printf(m, ",port=%u", nfss->port);
672 seq_printf(m, ",port=%u", nfss->port);
674 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
675 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
676 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
679 nfs_show_mountd_options(m, nfss, showdefaults);
681 nfs_show_nfsv4_options(m, nfss, showdefaults);
683 if (nfss->options & NFS_OPTION_FSCACHE)
684 seq_printf(m, ",fsc");
686 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
687 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
688 seq_printf(m, ",lookupcache=none");
690 seq_printf(m, ",lookupcache=pos");
693 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
694 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
696 if (!local_flock && !local_fcntl)
697 seq_printf(m, ",local_lock=none");
698 else if (local_flock && local_fcntl)
699 seq_printf(m, ",local_lock=all");
700 else if (local_flock)
701 seq_printf(m, ",local_lock=flock");
703 seq_printf(m, ",local_lock=posix");
707 * Describe the mount options on this VFS mountpoint
709 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
711 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
713 nfs_show_mount_options(m, nfss, 0);
715 seq_printf(m, ",addr=%s",
716 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
723 * Present statistical information for this VFS mountpoint
725 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
728 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
729 struct rpc_auth *auth = nfss->client->cl_auth;
730 struct nfs_iostats totals = { };
732 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
735 * Display all mount option settings
737 seq_printf(m, "\n\topts:\t");
738 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
739 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
740 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
741 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
742 nfs_show_mount_options(m, nfss, 1);
744 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
746 seq_printf(m, "\n\tcaps:\t");
747 seq_printf(m, "caps=0x%x", nfss->caps);
748 seq_printf(m, ",wtmult=%u", nfss->wtmult);
749 seq_printf(m, ",dtsize=%u", nfss->dtsize);
750 seq_printf(m, ",bsize=%u", nfss->bsize);
751 seq_printf(m, ",namlen=%u", nfss->namelen);
754 if (nfss->nfs_client->rpc_ops->version == 4) {
755 seq_printf(m, "\n\tnfsv4:\t");
756 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
757 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
758 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
763 * Display security flavor in effect for this mount
765 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
767 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
770 * Display superblock I/O counters
772 for_each_possible_cpu(cpu) {
773 struct nfs_iostats *stats;
776 stats = per_cpu_ptr(nfss->io_stats, cpu);
778 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
779 totals.events[i] += stats->events[i];
780 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
781 totals.bytes[i] += stats->bytes[i];
782 #ifdef CONFIG_NFS_FSCACHE
783 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
784 totals.fscache[i] += stats->fscache[i];
790 seq_printf(m, "\n\tevents:\t");
791 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
792 seq_printf(m, "%lu ", totals.events[i]);
793 seq_printf(m, "\n\tbytes:\t");
794 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
795 seq_printf(m, "%Lu ", totals.bytes[i]);
796 #ifdef CONFIG_NFS_FSCACHE
797 if (nfss->options & NFS_OPTION_FSCACHE) {
798 seq_printf(m, "\n\tfsc:\t");
799 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
800 seq_printf(m, "%Lu ", totals.bytes[i]);
805 rpc_print_iostats(m, nfss->client);
811 * Begin unmount by attempting to remove all automounted mountpoints we added
812 * in response to xdev traversals and referrals
814 static void nfs_umount_begin(struct super_block *sb)
816 struct nfs_server *server;
817 struct rpc_clnt *rpc;
820 /* -EIO all pending I/O */
821 rpc = server->client_acl;
823 rpc_killall_tasks(rpc);
824 rpc = server->client;
826 rpc_killall_tasks(rpc);
829 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
831 struct nfs_parsed_mount_data *data;
833 data = kzalloc(sizeof(*data), GFP_KERNEL);
835 data->acregmin = NFS_DEF_ACREGMIN;
836 data->acregmax = NFS_DEF_ACREGMAX;
837 data->acdirmin = NFS_DEF_ACDIRMIN;
838 data->acdirmax = NFS_DEF_ACDIRMAX;
839 data->mount_server.port = NFS_UNSPEC_PORT;
840 data->nfs_server.port = NFS_UNSPEC_PORT;
841 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
842 data->auth_flavors[0] = RPC_AUTH_UNIX;
843 data->auth_flavor_len = 1;
844 data->version = version;
845 data->minorversion = 0;
851 * Sanity-check a server address provided by the mount command.
853 * Address family must be initialized, and address must not be
854 * the ANY address for that family.
856 static int nfs_verify_server_address(struct sockaddr *addr)
858 switch (addr->sa_family) {
860 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
861 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
864 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
865 return !ipv6_addr_any(sa);
869 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
874 * Select between a default port value and a user-specified port value.
875 * If a zero value is set, then autobind will be used.
877 static void nfs_set_port(struct sockaddr *sap, int *port,
878 const unsigned short default_port)
880 if (*port == NFS_UNSPEC_PORT)
881 *port = default_port;
883 rpc_set_port(sap, *port);
887 * Sanity check the NFS transport protocol.
890 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
892 switch (mnt->nfs_server.protocol) {
893 case XPRT_TRANSPORT_UDP:
894 case XPRT_TRANSPORT_TCP:
895 case XPRT_TRANSPORT_RDMA:
898 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
903 * For text based NFSv2/v3 mounts, the mount protocol transport default
904 * settings should depend upon the specified NFS transport.
906 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
908 nfs_validate_transport_protocol(mnt);
910 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
911 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
913 switch (mnt->nfs_server.protocol) {
914 case XPRT_TRANSPORT_UDP:
915 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
917 case XPRT_TRANSPORT_TCP:
918 case XPRT_TRANSPORT_RDMA:
919 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
924 * Parse the value of the 'sec=' option.
926 static int nfs_parse_security_flavors(char *value,
927 struct nfs_parsed_mount_data *mnt)
929 substring_t args[MAX_OPT_ARGS];
931 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
933 switch (match_token(value, nfs_secflavor_tokens, args)) {
935 mnt->auth_flavors[0] = RPC_AUTH_NULL;
938 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
941 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
944 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
947 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
950 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
953 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
956 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
959 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
962 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
965 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
971 mnt->auth_flavor_len = 1;
976 * Error-check and convert a string of mount options from user space into
977 * a data structure. The whole mount string is processed; bad options are
978 * skipped as they are encountered. If there were no errors, return 1;
979 * otherwise return 0 (zero).
981 static int nfs_parse_mount_options(char *raw,
982 struct nfs_parsed_mount_data *mnt)
984 char *p, *string, *secdata;
985 int rc, sloppy = 0, invalid_option = 0;
986 unsigned short protofamily = AF_UNSPEC;
987 unsigned short mountfamily = AF_UNSPEC;
990 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
993 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
995 secdata = alloc_secdata();
999 rc = security_sb_copy_data(raw, secdata);
1001 goto out_security_failure;
1003 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1005 goto out_security_failure;
1007 free_secdata(secdata);
1009 while ((p = strsep(&raw, ",")) != NULL) {
1010 substring_t args[MAX_OPT_ARGS];
1011 unsigned long option;
1017 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1019 token = match_token(p, nfs_mount_option_tokens, args);
1023 * boolean options: foo/nofoo
1026 mnt->flags |= NFS_MOUNT_SOFT;
1029 mnt->flags &= ~NFS_MOUNT_SOFT;
1032 mnt->flags |= NFS_MOUNT_POSIX;
1035 mnt->flags &= ~NFS_MOUNT_POSIX;
1038 mnt->flags &= ~NFS_MOUNT_NOCTO;
1041 mnt->flags |= NFS_MOUNT_NOCTO;
1044 mnt->flags &= ~NFS_MOUNT_NOAC;
1047 mnt->flags |= NFS_MOUNT_NOAC;
1050 mnt->flags &= ~NFS_MOUNT_NONLM;
1051 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1052 NFS_MOUNT_LOCAL_FCNTL);
1055 mnt->flags |= NFS_MOUNT_NONLM;
1056 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1057 NFS_MOUNT_LOCAL_FCNTL);
1060 mnt->flags &= ~NFS_MOUNT_VER3;
1064 mnt->flags |= NFS_MOUNT_VER3;
1067 #ifdef CONFIG_NFS_V4
1069 mnt->flags &= ~NFS_MOUNT_VER3;
1074 mnt->flags &= ~NFS_MOUNT_TCP;
1075 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1078 mnt->flags |= NFS_MOUNT_TCP;
1079 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1082 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1083 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1084 xprt_load_transport(p);
1087 mnt->flags &= ~NFS_MOUNT_NOACL;
1090 mnt->flags |= NFS_MOUNT_NOACL;
1093 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1095 case Opt_nordirplus:
1096 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1098 case Opt_sharecache:
1099 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1101 case Opt_nosharecache:
1102 mnt->flags |= NFS_MOUNT_UNSHARED;
1105 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1107 case Opt_noresvport:
1108 mnt->flags |= NFS_MOUNT_NORESVPORT;
1111 mnt->options |= NFS_OPTION_FSCACHE;
1112 kfree(mnt->fscache_uniq);
1113 mnt->fscache_uniq = NULL;
1116 mnt->options &= ~NFS_OPTION_FSCACHE;
1117 kfree(mnt->fscache_uniq);
1118 mnt->fscache_uniq = NULL;
1122 * options that take numeric values
1125 string = match_strdup(args);
1128 rc = strict_strtoul(string, 10, &option);
1130 if (rc != 0 || option > USHRT_MAX)
1131 goto out_invalid_value;
1132 mnt->nfs_server.port = option;
1135 string = match_strdup(args);
1138 rc = strict_strtoul(string, 10, &option);
1141 goto out_invalid_value;
1142 mnt->rsize = option;
1145 string = match_strdup(args);
1148 rc = strict_strtoul(string, 10, &option);
1151 goto out_invalid_value;
1152 mnt->wsize = option;
1155 string = match_strdup(args);
1158 rc = strict_strtoul(string, 10, &option);
1161 goto out_invalid_value;
1162 mnt->bsize = option;
1165 string = match_strdup(args);
1168 rc = strict_strtoul(string, 10, &option);
1170 if (rc != 0 || option == 0)
1171 goto out_invalid_value;
1172 mnt->timeo = option;
1175 string = match_strdup(args);
1178 rc = strict_strtoul(string, 10, &option);
1180 if (rc != 0 || option == 0)
1181 goto out_invalid_value;
1182 mnt->retrans = option;
1185 string = match_strdup(args);
1188 rc = strict_strtoul(string, 10, &option);
1191 goto out_invalid_value;
1192 mnt->acregmin = option;
1195 string = match_strdup(args);
1198 rc = strict_strtoul(string, 10, &option);
1201 goto out_invalid_value;
1202 mnt->acregmax = option;
1205 string = match_strdup(args);
1208 rc = strict_strtoul(string, 10, &option);
1211 goto out_invalid_value;
1212 mnt->acdirmin = option;
1215 string = match_strdup(args);
1218 rc = strict_strtoul(string, 10, &option);
1221 goto out_invalid_value;
1222 mnt->acdirmax = option;
1225 string = match_strdup(args);
1228 rc = strict_strtoul(string, 10, &option);
1231 goto out_invalid_value;
1232 mnt->acregmin = mnt->acregmax =
1233 mnt->acdirmin = mnt->acdirmax = option;
1236 string = match_strdup(args);
1239 rc = strict_strtoul(string, 10, &option);
1242 goto out_invalid_value;
1243 mnt->namlen = option;
1246 string = match_strdup(args);
1249 rc = strict_strtoul(string, 10, &option);
1251 if (rc != 0 || option > USHRT_MAX)
1252 goto out_invalid_value;
1253 mnt->mount_server.port = option;
1256 string = match_strdup(args);
1259 rc = strict_strtoul(string, 10, &option);
1262 option < NFS_MNT_VERSION ||
1263 option > NFS_MNT3_VERSION)
1264 goto out_invalid_value;
1265 mnt->mount_server.version = option;
1268 string = match_strdup(args);
1271 rc = strict_strtoul(string, 10, &option);
1274 goto out_invalid_value;
1277 mnt->flags &= ~NFS_MOUNT_VER3;
1281 mnt->flags |= NFS_MOUNT_VER3;
1284 #ifdef CONFIG_NFS_V4
1286 mnt->flags &= ~NFS_MOUNT_VER3;
1291 goto out_invalid_value;
1294 case Opt_minorversion:
1295 string = match_strdup(args);
1298 rc = strict_strtoul(string, 10, &option);
1301 goto out_invalid_value;
1302 if (option > NFS4_MAX_MINOR_VERSION)
1303 goto out_invalid_value;
1304 mnt->minorversion = option;
1308 * options that take text values
1311 string = match_strdup(args);
1314 rc = nfs_parse_security_flavors(string, mnt);
1317 dfprintk(MOUNT, "NFS: unrecognized "
1318 "security flavor\n");
1323 string = match_strdup(args);
1326 token = match_token(string,
1327 nfs_xprt_protocol_tokens, args);
1329 protofamily = AF_INET;
1332 protofamily = AF_INET6;
1334 mnt->flags &= ~NFS_MOUNT_TCP;
1335 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1339 protofamily = AF_INET6;
1341 mnt->flags |= NFS_MOUNT_TCP;
1342 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1346 /* vector side protocols to TCP */
1347 mnt->flags |= NFS_MOUNT_TCP;
1348 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1349 xprt_load_transport(string);
1353 dfprintk(MOUNT, "NFS: unrecognized "
1354 "transport protocol\n");
1359 case Opt_mountproto:
1360 string = match_strdup(args);
1363 token = match_token(string,
1364 nfs_xprt_protocol_tokens, args);
1367 mountfamily = AF_INET;
1370 mountfamily = AF_INET6;
1372 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1375 mountfamily = AF_INET6;
1377 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1379 case Opt_xprt_rdma: /* not used for side protocols */
1381 dfprintk(MOUNT, "NFS: unrecognized "
1382 "transport protocol\n");
1387 string = match_strdup(args);
1390 mnt->nfs_server.addrlen =
1391 rpc_pton(string, strlen(string),
1393 &mnt->nfs_server.address,
1394 sizeof(mnt->nfs_server.address));
1396 if (mnt->nfs_server.addrlen == 0)
1397 goto out_invalid_address;
1399 case Opt_clientaddr:
1400 string = match_strdup(args);
1403 kfree(mnt->client_address);
1404 mnt->client_address = string;
1407 string = match_strdup(args);
1410 kfree(mnt->mount_server.hostname);
1411 mnt->mount_server.hostname = string;
1414 string = match_strdup(args);
1417 mnt->mount_server.addrlen =
1418 rpc_pton(string, strlen(string),
1420 &mnt->mount_server.address,
1421 sizeof(mnt->mount_server.address));
1423 if (mnt->mount_server.addrlen == 0)
1424 goto out_invalid_address;
1426 case Opt_lookupcache:
1427 string = match_strdup(args);
1430 token = match_token(string,
1431 nfs_lookupcache_tokens, args);
1434 case Opt_lookupcache_all:
1435 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1437 case Opt_lookupcache_positive:
1438 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1439 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1441 case Opt_lookupcache_none:
1442 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1445 dfprintk(MOUNT, "NFS: invalid "
1446 "lookupcache argument\n");
1450 case Opt_fscache_uniq:
1451 string = match_strdup(args);
1454 kfree(mnt->fscache_uniq);
1455 mnt->fscache_uniq = string;
1456 mnt->options |= NFS_OPTION_FSCACHE;
1458 case Opt_local_lock:
1459 string = match_strdup(args);
1462 token = match_token(string, nfs_local_lock_tokens,
1466 case Opt_local_lock_all:
1467 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1468 NFS_MOUNT_LOCAL_FCNTL);
1470 case Opt_local_lock_flock:
1471 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1473 case Opt_local_lock_posix:
1474 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1476 case Opt_local_lock_none:
1477 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1478 NFS_MOUNT_LOCAL_FCNTL);
1481 dfprintk(MOUNT, "NFS: invalid "
1482 "local_lock argument\n");
1492 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1495 case Opt_deprecated:
1496 dfprintk(MOUNT, "NFS: ignoring mount option "
1502 dfprintk(MOUNT, "NFS: unrecognized mount option "
1507 if (!sloppy && invalid_option)
1511 * verify that any proto=/mountproto= options match the address
1512 * familiies in the addr=/mountaddr= options.
1514 if (protofamily != AF_UNSPEC &&
1515 protofamily != mnt->nfs_server.address.ss_family)
1516 goto out_proto_mismatch;
1518 if (mountfamily != AF_UNSPEC) {
1519 if (mnt->mount_server.addrlen) {
1520 if (mountfamily != mnt->mount_server.address.ss_family)
1521 goto out_mountproto_mismatch;
1523 if (mountfamily != mnt->nfs_server.address.ss_family)
1524 goto out_mountproto_mismatch;
1530 out_mountproto_mismatch:
1531 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1535 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1537 out_invalid_address:
1538 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1541 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1544 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1546 out_security_failure:
1547 free_secdata(secdata);
1548 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1553 * Match the requested auth flavors with the list returned by
1554 * the server. Returns zero and sets the mount's authentication
1555 * flavor on success; returns -EACCES if server does not support
1556 * the requested flavor.
1558 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1559 struct nfs_mount_request *request)
1561 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1564 * Certain releases of Linux's mountd return an empty
1565 * flavor list. To prevent behavioral regression with
1566 * these servers (ie. rejecting mounts that used to
1567 * succeed), revert to pre-2.6.32 behavior (no checking)
1568 * if the returned flavor list is empty.
1570 if (server_authlist_len == 0)
1574 * We avoid sophisticated negotiating here, as there are
1575 * plenty of cases where we can get it wrong, providing
1576 * either too little or too much security.
1578 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1579 * flavor listed first. However, some servers list
1580 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1581 * preferred default, in args->auth_flavors[0] if user
1582 * didn't specify sec= mount option.
1584 for (i = 0; i < args->auth_flavor_len; i++)
1585 for (j = 0; j < server_authlist_len; j++)
1586 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1587 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1588 request->auth_flavs[j]);
1589 args->auth_flavors[0] = request->auth_flavs[j];
1593 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1594 nfs_umount(request);
1599 * Use the remote server's MOUNT service to request the NFS file handle
1600 * corresponding to the provided path.
1602 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1603 struct nfs_fh *root_fh)
1605 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1606 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1607 struct nfs_mount_request request = {
1608 .sap = (struct sockaddr *)
1609 &args->mount_server.address,
1610 .dirpath = args->nfs_server.export_path,
1611 .protocol = args->mount_server.protocol,
1613 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1614 .auth_flav_len = &server_authlist_len,
1615 .auth_flavs = server_authlist,
1619 if (args->mount_server.version == 0) {
1620 switch (args->version) {
1622 args->mount_server.version = NFS_MNT3_VERSION;
1625 args->mount_server.version = NFS_MNT_VERSION;
1628 request.version = args->mount_server.version;
1630 if (args->mount_server.hostname)
1631 request.hostname = args->mount_server.hostname;
1633 request.hostname = args->nfs_server.hostname;
1636 * Construct the mount server's address.
1638 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1639 memcpy(request.sap, &args->nfs_server.address,
1640 args->nfs_server.addrlen);
1641 args->mount_server.addrlen = args->nfs_server.addrlen;
1643 request.salen = args->mount_server.addrlen;
1644 nfs_set_port(request.sap, &args->mount_server.port, 0);
1647 * Now ask the mount server to map our export path
1650 status = nfs_mount(&request);
1652 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1653 request.hostname, status);
1658 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1660 if (args->mount_server.version != NFS_MNT3_VERSION)
1662 return nfs_walk_authlist(args, &request);
1665 static int nfs_parse_simple_hostname(const char *dev_name,
1666 char **hostname, size_t maxnamlen,
1667 char **export_path, size_t maxpathlen)
1670 char *colon, *comma;
1672 colon = strchr(dev_name, ':');
1674 goto out_bad_devname;
1676 len = colon - dev_name;
1677 if (len > maxnamlen)
1680 /* N.B. caller will free nfs_server.hostname in all cases */
1681 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1685 /* kill possible hostname list: not supported */
1686 comma = strchr(*hostname, ',');
1687 if (comma != NULL) {
1688 if (comma == *hostname)
1689 goto out_bad_devname;
1694 len = strlen(colon);
1695 if (len > maxpathlen)
1697 *export_path = kstrndup(colon, len, GFP_KERNEL);
1701 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1705 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1709 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1713 dfprintk(MOUNT, "NFS: server hostname too long\n");
1714 return -ENAMETOOLONG;
1717 dfprintk(MOUNT, "NFS: export pathname too long\n");
1718 return -ENAMETOOLONG;
1722 * Hostname has square brackets around it because it contains one or
1723 * more colons. We look for the first closing square bracket, and a
1724 * colon must follow it.
1726 static int nfs_parse_protected_hostname(const char *dev_name,
1727 char **hostname, size_t maxnamlen,
1728 char **export_path, size_t maxpathlen)
1733 start = (char *)(dev_name + 1);
1735 end = strchr(start, ']');
1737 goto out_bad_devname;
1738 if (*(end + 1) != ':')
1739 goto out_bad_devname;
1742 if (len > maxnamlen)
1745 /* N.B. caller will free nfs_server.hostname in all cases */
1746 *hostname = kstrndup(start, len, GFP_KERNEL);
1747 if (*hostname == NULL)
1752 if (len > maxpathlen)
1754 *export_path = kstrndup(end, len, GFP_KERNEL);
1761 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1765 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1769 dfprintk(MOUNT, "NFS: server hostname too long\n");
1770 return -ENAMETOOLONG;
1773 dfprintk(MOUNT, "NFS: export pathname too long\n");
1774 return -ENAMETOOLONG;
1778 * Split "dev_name" into "hostname:export_path".
1780 * The leftmost colon demarks the split between the server's hostname
1781 * and the export path. If the hostname starts with a left square
1782 * bracket, then it may contain colons.
1784 * Note: caller frees hostname and export path, even on error.
1786 static int nfs_parse_devname(const char *dev_name,
1787 char **hostname, size_t maxnamlen,
1788 char **export_path, size_t maxpathlen)
1790 if (*dev_name == '[')
1791 return nfs_parse_protected_hostname(dev_name,
1792 hostname, maxnamlen,
1793 export_path, maxpathlen);
1795 return nfs_parse_simple_hostname(dev_name,
1796 hostname, maxnamlen,
1797 export_path, maxpathlen);
1801 * Validate the NFS2/NFS3 mount data
1802 * - fills in the mount root filehandle
1804 * For option strings, user space handles the following behaviors:
1806 * + DNS: mapping server host name to IP address ("addr=" option)
1808 * + failure mode: how to behave if a mount request can't be handled
1809 * immediately ("fg/bg" option)
1811 * + retry: how often to retry a mount request ("retry=" option)
1813 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1814 * mountproto=tcp after mountproto=udp, and so on
1816 static int nfs_validate_mount_data(void *options,
1817 struct nfs_parsed_mount_data *args,
1818 struct nfs_fh *mntfh,
1819 const char *dev_name)
1821 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1822 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1827 switch (data->version) {
1833 if (data->flags & NFS_MOUNT_VER3)
1835 data->root.size = NFS2_FHSIZE;
1836 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1838 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1841 memset(data->context, 0, sizeof(data->context));
1843 if (data->flags & NFS_MOUNT_VER3) {
1844 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1845 goto out_invalid_fh;
1846 mntfh->size = data->root.size;
1849 mntfh->size = NFS2_FHSIZE;
1854 memcpy(mntfh->data, data->root.data, mntfh->size);
1855 if (mntfh->size < sizeof(mntfh->data))
1856 memset(mntfh->data + mntfh->size, 0,
1857 sizeof(mntfh->data) - mntfh->size);
1860 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1863 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1864 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1865 args->rsize = data->rsize;
1866 args->wsize = data->wsize;
1867 args->timeo = data->timeo;
1868 args->retrans = data->retrans;
1869 args->acregmin = data->acregmin;
1870 args->acregmax = data->acregmax;
1871 args->acdirmin = data->acdirmin;
1872 args->acdirmax = data->acdirmax;
1874 memcpy(sap, &data->addr, sizeof(data->addr));
1875 args->nfs_server.addrlen = sizeof(data->addr);
1876 if (!nfs_verify_server_address(sap))
1877 goto out_no_address;
1879 if (!(data->flags & NFS_MOUNT_TCP))
1880 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1881 /* N.B. caller will free nfs_server.hostname in all cases */
1882 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1883 args->namlen = data->namlen;
1884 args->bsize = data->bsize;
1886 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1887 args->auth_flavors[0] = data->pseudoflavor;
1888 if (!args->nfs_server.hostname)
1891 if (!(data->flags & NFS_MOUNT_NONLM))
1892 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1893 NFS_MOUNT_LOCAL_FCNTL);
1895 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1896 NFS_MOUNT_LOCAL_FCNTL);
1898 * The legacy version 6 binary mount data from userspace has a
1899 * field used only to transport selinux information into the
1900 * the kernel. To continue to support that functionality we
1901 * have a touch of selinux knowledge here in the NFS code. The
1902 * userspace code converted context=blah to just blah so we are
1903 * converting back to the full string selinux understands.
1905 if (data->context[0]){
1906 #ifdef CONFIG_SECURITY_SELINUX
1908 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1911 strcpy(opts_str, "context=");
1912 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1913 strcat(opts_str, &data->context[0]);
1914 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1927 if (nfs_parse_mount_options((char *)options, args) == 0)
1930 if (!nfs_verify_server_address(sap))
1931 goto out_no_address;
1933 if (args->version == 4)
1934 #ifdef CONFIG_NFS_V4
1935 return nfs4_validate_text_mount_data(options,
1938 goto out_v4_not_compiled;
1941 nfs_set_port(sap, &args->nfs_server.port, 0);
1943 nfs_set_mount_transport_protocol(args);
1945 status = nfs_parse_devname(dev_name,
1946 &args->nfs_server.hostname,
1948 &args->nfs_server.export_path,
1951 status = nfs_try_mount(args, mntfh);
1953 kfree(args->nfs_server.export_path);
1954 args->nfs_server.export_path = NULL;
1963 #ifndef CONFIG_NFS_V3
1964 if (args->version == 3)
1965 goto out_v3_not_compiled;
1966 #endif /* !CONFIG_NFS_V3 */
1971 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1975 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1980 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1983 #ifndef CONFIG_NFS_V3
1984 out_v3_not_compiled:
1985 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1986 return -EPROTONOSUPPORT;
1987 #endif /* !CONFIG_NFS_V3 */
1989 #ifndef CONFIG_NFS_V4
1990 out_v4_not_compiled:
1991 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1992 return -EPROTONOSUPPORT;
1993 #endif /* !CONFIG_NFS_V4 */
1996 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2000 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2004 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2009 nfs_compare_remount_data(struct nfs_server *nfss,
2010 struct nfs_parsed_mount_data *data)
2012 if (data->flags != nfss->flags ||
2013 data->rsize != nfss->rsize ||
2014 data->wsize != nfss->wsize ||
2015 data->retrans != nfss->client->cl_timeout->to_retries ||
2016 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2017 data->acregmin != nfss->acregmin / HZ ||
2018 data->acregmax != nfss->acregmax / HZ ||
2019 data->acdirmin != nfss->acdirmin / HZ ||
2020 data->acdirmax != nfss->acdirmax / HZ ||
2021 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2022 data->nfs_server.port != nfss->port ||
2023 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2024 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2025 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2032 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2035 struct nfs_server *nfss = sb->s_fs_info;
2036 struct nfs_parsed_mount_data *data;
2037 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2038 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2039 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2042 * Userspace mount programs that send binary options generally send
2043 * them populated with default values. We have no way to know which
2044 * ones were explicitly specified. Fall back to legacy behavior and
2045 * just return success.
2047 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2048 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2049 options->version <= 6))))
2052 data = kzalloc(sizeof(*data), GFP_KERNEL);
2056 /* fill out struct with values from existing mount */
2057 data->flags = nfss->flags;
2058 data->rsize = nfss->rsize;
2059 data->wsize = nfss->wsize;
2060 data->retrans = nfss->client->cl_timeout->to_retries;
2061 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2062 data->acregmin = nfss->acregmin / HZ;
2063 data->acregmax = nfss->acregmax / HZ;
2064 data->acdirmin = nfss->acdirmin / HZ;
2065 data->acdirmax = nfss->acdirmax / HZ;
2066 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2067 data->nfs_server.port = nfss->port;
2068 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2069 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2070 data->nfs_server.addrlen);
2072 /* overwrite those values with any that were specified */
2073 error = nfs_parse_mount_options((char *)options, data);
2077 /* compare new mount options with old ones */
2078 error = nfs_compare_remount_data(nfss, data);
2085 * Initialise the common bits of the superblock
2087 static inline void nfs_initialise_sb(struct super_block *sb)
2089 struct nfs_server *server = NFS_SB(sb);
2091 sb->s_magic = NFS_SUPER_MAGIC;
2093 /* We probably want something more informative here */
2094 snprintf(sb->s_id, sizeof(sb->s_id),
2095 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2097 if (sb->s_blocksize == 0)
2098 sb->s_blocksize = nfs_block_bits(server->wsize,
2099 &sb->s_blocksize_bits);
2101 if (server->flags & NFS_MOUNT_NOAC)
2102 sb->s_flags |= MS_SYNCHRONOUS;
2104 sb->s_bdi = &server->backing_dev_info;
2106 nfs_super_set_maxbytes(sb, server->maxfilesize);
2110 * Finish setting up an NFS2/3 superblock
2112 static void nfs_fill_super(struct super_block *sb,
2113 struct nfs_parsed_mount_data *data)
2115 struct nfs_server *server = NFS_SB(sb);
2117 sb->s_blocksize_bits = 0;
2118 sb->s_blocksize = 0;
2120 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2122 if (server->nfs_client->rpc_ops->version == 3) {
2123 /* The VFS shouldn't apply the umask to mode bits. We will do
2124 * so ourselves when necessary.
2126 sb->s_flags |= MS_POSIXACL;
2127 sb->s_time_gran = 1;
2130 sb->s_op = &nfs_sops;
2131 nfs_initialise_sb(sb);
2135 * Finish setting up a cloned NFS2/3 superblock
2137 static void nfs_clone_super(struct super_block *sb,
2138 const struct super_block *old_sb)
2140 struct nfs_server *server = NFS_SB(sb);
2142 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2143 sb->s_blocksize = old_sb->s_blocksize;
2144 sb->s_maxbytes = old_sb->s_maxbytes;
2146 if (server->nfs_client->rpc_ops->version == 3) {
2147 /* The VFS shouldn't apply the umask to mode bits. We will do
2148 * so ourselves when necessary.
2150 sb->s_flags |= MS_POSIXACL;
2151 sb->s_time_gran = 1;
2154 sb->s_op = old_sb->s_op;
2155 nfs_initialise_sb(sb);
2158 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2160 const struct nfs_server *a = s->s_fs_info;
2161 const struct rpc_clnt *clnt_a = a->client;
2162 const struct rpc_clnt *clnt_b = b->client;
2164 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2166 if (a->nfs_client != b->nfs_client)
2168 if (a->flags != b->flags)
2170 if (a->wsize != b->wsize)
2172 if (a->rsize != b->rsize)
2174 if (a->acregmin != b->acregmin)
2176 if (a->acregmax != b->acregmax)
2178 if (a->acdirmin != b->acdirmin)
2180 if (a->acdirmax != b->acdirmax)
2182 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2189 struct nfs_sb_mountdata {
2190 struct nfs_server *server;
2194 static int nfs_set_super(struct super_block *s, void *data)
2196 struct nfs_sb_mountdata *sb_mntdata = data;
2197 struct nfs_server *server = sb_mntdata->server;
2200 s->s_flags = sb_mntdata->mntflags;
2201 s->s_fs_info = server;
2202 ret = set_anon_super(s, server);
2204 server->s_dev = s->s_dev;
2208 static int nfs_compare_super_address(struct nfs_server *server1,
2209 struct nfs_server *server2)
2211 struct sockaddr *sap1, *sap2;
2213 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2214 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2216 if (sap1->sa_family != sap2->sa_family)
2219 switch (sap1->sa_family) {
2221 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2222 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2223 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2225 if (sin1->sin_port != sin2->sin_port)
2230 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2231 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2232 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2234 if (sin1->sin6_port != sin2->sin6_port)
2245 static int nfs_compare_super(struct super_block *sb, void *data)
2247 struct nfs_sb_mountdata *sb_mntdata = data;
2248 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2249 int mntflags = sb_mntdata->mntflags;
2251 if (!nfs_compare_super_address(old, server))
2253 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2254 if (old->flags & NFS_MOUNT_UNSHARED)
2256 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2258 return nfs_compare_mount_options(sb, server, mntflags);
2261 static int nfs_bdi_register(struct nfs_server *server)
2263 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2266 static int nfs_get_sb(struct file_system_type *fs_type,
2267 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2269 struct nfs_server *server = NULL;
2270 struct super_block *s;
2271 struct nfs_parsed_mount_data *data;
2272 struct nfs_fh *mntfh;
2273 struct dentry *mntroot;
2274 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2275 struct nfs_sb_mountdata sb_mntdata = {
2278 int error = -ENOMEM;
2280 data = nfs_alloc_parsed_mount_data(3);
2281 mntfh = nfs_alloc_fhandle();
2282 if (data == NULL || mntfh == NULL)
2285 security_init_mnt_opts(&data->lsm_opts);
2287 /* Validate the mount data */
2288 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2292 #ifdef CONFIG_NFS_V4
2293 if (data->version == 4) {
2294 error = nfs4_try_mount(flags, dev_name, data, mnt);
2295 kfree(data->client_address);
2296 kfree(data->nfs_server.export_path);
2299 #endif /* CONFIG_NFS_V4 */
2301 /* Get a volume representation */
2302 server = nfs_create_server(data, mntfh);
2303 if (IS_ERR(server)) {
2304 error = PTR_ERR(server);
2307 sb_mntdata.server = server;
2309 if (server->flags & NFS_MOUNT_UNSHARED)
2310 compare_super = NULL;
2312 /* Get a superblock - note that we may end up sharing one that already exists */
2313 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2319 if (s->s_fs_info != server) {
2320 nfs_free_server(server);
2323 error = nfs_bdi_register(server);
2325 goto error_splat_bdi;
2329 /* initial superblock/root creation */
2330 nfs_fill_super(s, data);
2331 nfs_fscache_get_super_cookie(
2332 s, data ? data->fscache_uniq : NULL, NULL);
2335 mntroot = nfs_get_root(s, mntfh);
2336 if (IS_ERR(mntroot)) {
2337 error = PTR_ERR(mntroot);
2338 goto error_splat_super;
2341 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2343 goto error_splat_root;
2345 s->s_flags |= MS_ACTIVE;
2347 mnt->mnt_root = mntroot;
2351 kfree(data->nfs_server.hostname);
2352 kfree(data->mount_server.hostname);
2353 kfree(data->fscache_uniq);
2354 security_free_mnt_opts(&data->lsm_opts);
2356 nfs_free_fhandle(mntfh);
2361 nfs_free_server(server);
2367 if (server && !s->s_root)
2368 bdi_unregister(&server->backing_dev_info);
2370 deactivate_locked_super(s);
2375 * Ensure that we unregister the bdi before kill_anon_super
2376 * releases the device name
2378 static void nfs_put_super(struct super_block *s)
2380 struct nfs_server *server = NFS_SB(s);
2382 bdi_unregister(&server->backing_dev_info);
2386 * Destroy an NFS2/3 superblock
2388 static void nfs_kill_super(struct super_block *s)
2390 struct nfs_server *server = NFS_SB(s);
2393 nfs_fscache_release_super_cookie(s);
2394 nfs_free_server(server);
2398 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2400 static struct dentry *
2401 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2402 const char *dev_name, void *raw_data)
2404 struct nfs_clone_mount *data = raw_data;
2405 struct super_block *s;
2406 struct nfs_server *server;
2407 struct dentry *mntroot;
2408 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2409 struct nfs_sb_mountdata sb_mntdata = {
2414 dprintk("--> nfs_xdev_mount()\n");
2416 /* create a new volume representation */
2417 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2418 if (IS_ERR(server)) {
2419 error = PTR_ERR(server);
2420 goto out_err_noserver;
2422 sb_mntdata.server = server;
2424 if (server->flags & NFS_MOUNT_UNSHARED)
2425 compare_super = NULL;
2427 /* Get a superblock - note that we may end up sharing one that already exists */
2428 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2434 if (s->s_fs_info != server) {
2435 nfs_free_server(server);
2438 error = nfs_bdi_register(server);
2440 goto error_splat_bdi;
2444 /* initial superblock/root creation */
2445 nfs_clone_super(s, data->sb);
2446 nfs_fscache_get_super_cookie(s, NULL, data);
2449 mntroot = nfs_get_root(s, data->fh);
2450 if (IS_ERR(mntroot)) {
2451 error = PTR_ERR(mntroot);
2452 goto error_splat_super;
2454 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2457 goto error_splat_super;
2460 s->s_flags |= MS_ACTIVE;
2462 /* clone any lsm security options from the parent to the new sb */
2463 security_sb_clone_mnt_opts(data->sb, s);
2465 dprintk("<-- nfs_xdev_mount() = 0\n");
2469 nfs_free_server(server);
2471 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2472 return ERR_PTR(error);
2475 if (server && !s->s_root)
2476 bdi_unregister(&server->backing_dev_info);
2478 deactivate_locked_super(s);
2479 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2480 return ERR_PTR(error);
2483 #ifdef CONFIG_NFS_V4
2486 * Finish setting up a cloned NFS4 superblock
2488 static void nfs4_clone_super(struct super_block *sb,
2489 const struct super_block *old_sb)
2491 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2492 sb->s_blocksize = old_sb->s_blocksize;
2493 sb->s_maxbytes = old_sb->s_maxbytes;
2494 sb->s_time_gran = 1;
2495 sb->s_op = old_sb->s_op;
2496 nfs_initialise_sb(sb);
2500 * Set up an NFS4 superblock
2502 static void nfs4_fill_super(struct super_block *sb)
2504 sb->s_time_gran = 1;
2505 sb->s_op = &nfs4_sops;
2506 nfs_initialise_sb(sb);
2509 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2511 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2512 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2515 static int nfs4_validate_text_mount_data(void *options,
2516 struct nfs_parsed_mount_data *args,
2517 const char *dev_name)
2519 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2521 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2523 nfs_validate_transport_protocol(args);
2525 nfs4_validate_mount_flags(args);
2527 if (args->version != 4) {
2529 "NFS4: Illegal mount version\n");
2533 if (args->auth_flavor_len > 1) {
2535 "NFS4: Too many RPC auth flavours specified\n");
2539 if (args->client_address == NULL) {
2541 "NFS4: mount program didn't pass callback address\n");
2545 return nfs_parse_devname(dev_name,
2546 &args->nfs_server.hostname,
2548 &args->nfs_server.export_path,
2553 * Validate NFSv4 mount options
2555 static int nfs4_validate_mount_data(void *options,
2556 struct nfs_parsed_mount_data *args,
2557 const char *dev_name)
2559 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2560 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2566 switch (data->version) {
2568 if (data->host_addrlen > sizeof(args->nfs_server.address))
2569 goto out_no_address;
2570 if (data->host_addrlen == 0)
2571 goto out_no_address;
2572 args->nfs_server.addrlen = data->host_addrlen;
2573 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2575 if (!nfs_verify_server_address(sap))
2576 goto out_no_address;
2578 if (data->auth_flavourlen) {
2579 if (data->auth_flavourlen > 1)
2580 goto out_inval_auth;
2581 if (copy_from_user(&args->auth_flavors[0],
2582 data->auth_flavours,
2583 sizeof(args->auth_flavors[0])))
2587 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2590 args->nfs_server.hostname = c;
2592 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2595 args->nfs_server.export_path = c;
2596 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2598 c = strndup_user(data->client_addr.data, 16);
2601 args->client_address = c;
2604 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2608 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2609 args->rsize = data->rsize;
2610 args->wsize = data->wsize;
2611 args->timeo = data->timeo;
2612 args->retrans = data->retrans;
2613 args->acregmin = data->acregmin;
2614 args->acregmax = data->acregmax;
2615 args->acdirmin = data->acdirmin;
2616 args->acdirmax = data->acdirmax;
2617 args->nfs_server.protocol = data->proto;
2618 nfs_validate_transport_protocol(args);
2622 if (nfs_parse_mount_options((char *)options, args) == 0)
2625 if (!nfs_verify_server_address(sap))
2628 return nfs4_validate_text_mount_data(options, args, dev_name);
2634 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2638 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2639 data->auth_flavourlen);
2643 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2648 * Get the superblock for the NFS4 root partition
2650 static struct dentry *
2651 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2652 const char *dev_name, void *raw_data)
2654 struct nfs_parsed_mount_data *data = raw_data;
2655 struct super_block *s;
2656 struct nfs_server *server;
2657 struct nfs_fh *mntfh;
2658 struct dentry *mntroot;
2659 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2660 struct nfs_sb_mountdata sb_mntdata = {
2663 int error = -ENOMEM;
2665 mntfh = nfs_alloc_fhandle();
2666 if (data == NULL || mntfh == NULL)
2669 security_init_mnt_opts(&data->lsm_opts);
2671 /* Get a volume representation */
2672 server = nfs4_create_server(data, mntfh);
2673 if (IS_ERR(server)) {
2674 error = PTR_ERR(server);
2677 sb_mntdata.server = server;
2679 if (server->flags & NFS4_MOUNT_UNSHARED)
2680 compare_super = NULL;
2682 /* Get a superblock - note that we may end up sharing one that already exists */
2683 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2689 if (s->s_fs_info != server) {
2690 nfs_free_server(server);
2693 error = nfs_bdi_register(server);
2695 goto error_splat_bdi;
2699 /* initial superblock/root creation */
2701 nfs_fscache_get_super_cookie(
2702 s, data ? data->fscache_uniq : NULL, NULL);
2705 mntroot = nfs4_get_root(s, mntfh);
2706 if (IS_ERR(mntroot)) {
2707 error = PTR_ERR(mntroot);
2708 goto error_splat_super;
2711 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2713 goto error_splat_root;
2715 s->s_flags |= MS_ACTIVE;
2717 security_free_mnt_opts(&data->lsm_opts);
2718 nfs_free_fhandle(mntfh);
2722 security_free_mnt_opts(&data->lsm_opts);
2724 nfs_free_fhandle(mntfh);
2725 return ERR_PTR(error);
2728 nfs_free_server(server);
2734 if (server && !s->s_root)
2735 bdi_unregister(&server->backing_dev_info);
2737 deactivate_locked_super(s);
2741 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2742 int flags, void *data, const char *hostname)
2744 struct vfsmount *root_mnt;
2748 len = strlen(hostname) + 3;
2749 root_devname = kmalloc(len, GFP_KERNEL);
2750 if (root_devname == NULL)
2751 return ERR_PTR(-ENOMEM);
2752 snprintf(root_devname, len, "%s:/", hostname);
2753 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2754 kfree(root_devname);
2758 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2760 char *page = (char *) __get_free_page(GFP_KERNEL);
2761 char *devname, *tmp;
2765 devname = nfs_path(path->mnt->mnt_devname,
2766 path->mnt->mnt_root, path->dentry,
2768 if (IS_ERR(devname))
2770 tmp = kstrdup(devname, GFP_KERNEL);
2773 kfree(mnt->mnt_devname);
2774 mnt->mnt_devname = tmp;
2776 free_page((unsigned long)page);
2779 struct nfs_referral_count {
2780 struct list_head list;
2781 const struct task_struct *task;
2782 unsigned int referral_count;
2785 static LIST_HEAD(nfs_referral_count_list);
2786 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2788 static struct nfs_referral_count *nfs_find_referral_count(void)
2790 struct nfs_referral_count *p;
2792 list_for_each_entry(p, &nfs_referral_count_list, list) {
2793 if (p->task == current)
2799 #define NFS_MAX_NESTED_REFERRALS 2
2801 static int nfs_referral_loop_protect(void)
2803 struct nfs_referral_count *p, *new;
2806 new = kmalloc(sizeof(*new), GFP_KERNEL);
2809 new->task = current;
2810 new->referral_count = 1;
2813 spin_lock(&nfs_referral_count_list_lock);
2814 p = nfs_find_referral_count();
2816 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2819 p->referral_count++;
2821 list_add(&new->list, &nfs_referral_count_list);
2824 spin_unlock(&nfs_referral_count_list_lock);
2830 static void nfs_referral_loop_unprotect(void)
2832 struct nfs_referral_count *p;
2834 spin_lock(&nfs_referral_count_list_lock);
2835 p = nfs_find_referral_count();
2836 p->referral_count--;
2837 if (p->referral_count == 0)
2841 spin_unlock(&nfs_referral_count_list_lock);
2845 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2846 const char *export_path, struct vfsmount *mnt_target)
2848 struct nameidata *nd = NULL;
2849 struct mnt_namespace *ns_private;
2850 struct super_block *s;
2853 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2857 ns_private = create_mnt_ns(root_mnt);
2858 ret = PTR_ERR(ns_private);
2859 if (IS_ERR(ns_private))
2862 ret = nfs_referral_loop_protect();
2864 goto out_put_mnt_ns;
2866 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2867 export_path, LOOKUP_FOLLOW, nd);
2869 nfs_referral_loop_unprotect();
2870 put_mnt_ns(ns_private);
2875 s = nd->path.mnt->mnt_sb;
2876 atomic_inc(&s->s_active);
2877 mnt_target->mnt_sb = s;
2878 mnt_target->mnt_root = dget(nd->path.dentry);
2880 /* Correct the device pathname */
2881 nfs_fix_devname(&nd->path, mnt_target);
2883 path_put(&nd->path);
2885 down_write(&s->s_umount);
2888 put_mnt_ns(ns_private);
2896 static int nfs4_try_mount(int flags, const char *dev_name,
2897 struct nfs_parsed_mount_data *data,
2898 struct vfsmount *mnt)
2901 struct vfsmount *root_mnt;
2904 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2906 export_path = data->nfs_server.export_path;
2907 data->nfs_server.export_path = "/";
2908 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2909 data->nfs_server.hostname);
2910 data->nfs_server.export_path = export_path;
2912 error = PTR_ERR(root_mnt);
2913 if (IS_ERR(root_mnt))
2916 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2919 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2920 error != 0 ? " [error]" : "");
2925 * Get the superblock for an NFS4 mountpoint
2927 static int nfs4_get_sb(struct file_system_type *fs_type,
2928 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2930 struct nfs_parsed_mount_data *data;
2931 int error = -ENOMEM;
2933 data = nfs_alloc_parsed_mount_data(4);
2937 /* Validate the mount data */
2938 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2942 error = nfs4_try_mount(flags, dev_name, data, mnt);
2945 kfree(data->client_address);
2946 kfree(data->nfs_server.export_path);
2947 kfree(data->nfs_server.hostname);
2948 kfree(data->fscache_uniq);
2951 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2952 error != 0 ? " [error]" : "");
2956 static void nfs4_kill_super(struct super_block *sb)
2958 struct nfs_server *server = NFS_SB(sb);
2960 dprintk("--> %s\n", __func__);
2961 nfs_super_return_all_delegations(sb);
2962 kill_anon_super(sb);
2963 nfs_fscache_release_super_cookie(sb);
2964 nfs_free_server(server);
2965 dprintk("<-- %s\n", __func__);
2969 * Clone an NFS4 server record on xdev traversal (FSID-change)
2971 static struct dentry *
2972 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2973 const char *dev_name, void *raw_data)
2975 struct nfs_clone_mount *data = raw_data;
2976 struct super_block *s;
2977 struct nfs_server *server;
2978 struct dentry *mntroot;
2979 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2980 struct nfs_sb_mountdata sb_mntdata = {
2985 dprintk("--> nfs4_xdev_mount()\n");
2987 /* create a new volume representation */
2988 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2989 if (IS_ERR(server)) {
2990 error = PTR_ERR(server);
2991 goto out_err_noserver;
2993 sb_mntdata.server = server;
2995 if (server->flags & NFS4_MOUNT_UNSHARED)
2996 compare_super = NULL;
2998 /* Get a superblock - note that we may end up sharing one that already exists */
2999 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3005 if (s->s_fs_info != server) {
3006 nfs_free_server(server);
3009 error = nfs_bdi_register(server);
3011 goto error_splat_bdi;
3015 /* initial superblock/root creation */
3016 nfs4_clone_super(s, data->sb);
3017 nfs_fscache_get_super_cookie(s, NULL, data);
3020 mntroot = nfs4_get_root(s, data->fh);
3021 if (IS_ERR(mntroot)) {
3022 error = PTR_ERR(mntroot);
3023 goto error_splat_super;
3025 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3028 goto error_splat_super;
3031 s->s_flags |= MS_ACTIVE;
3033 security_sb_clone_mnt_opts(data->sb, s);
3035 dprintk("<-- nfs4_xdev_mount() = 0\n");
3039 nfs_free_server(server);
3041 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3042 return ERR_PTR(error);
3045 if (server && !s->s_root)
3046 bdi_unregister(&server->backing_dev_info);
3048 deactivate_locked_super(s);
3049 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3050 return ERR_PTR(error);
3053 static struct dentry *
3054 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3055 const char *dev_name, void *raw_data)
3057 struct nfs_clone_mount *data = raw_data;
3058 struct super_block *s;
3059 struct nfs_server *server;
3060 struct dentry *mntroot;
3061 struct nfs_fh *mntfh;
3062 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
3063 struct nfs_sb_mountdata sb_mntdata = {
3066 int error = -ENOMEM;
3068 dprintk("--> nfs4_referral_get_sb()\n");
3070 mntfh = nfs_alloc_fhandle();
3074 /* create a new volume representation */
3075 server = nfs4_create_referral_server(data, mntfh);
3076 if (IS_ERR(server)) {
3077 error = PTR_ERR(server);
3078 goto out_err_noserver;
3080 sb_mntdata.server = server;
3082 if (server->flags & NFS4_MOUNT_UNSHARED)
3083 compare_super = NULL;
3085 /* Get a superblock - note that we may end up sharing one that already exists */
3086 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3092 if (s->s_fs_info != server) {
3093 nfs_free_server(server);
3096 error = nfs_bdi_register(server);
3098 goto error_splat_bdi;
3102 /* initial superblock/root creation */
3104 nfs_fscache_get_super_cookie(s, NULL, data);
3107 mntroot = nfs4_get_root(s, mntfh);
3108 if (IS_ERR(mntroot)) {
3109 error = PTR_ERR(mntroot);
3110 goto error_splat_super;
3112 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3115 goto error_splat_super;
3118 s->s_flags |= MS_ACTIVE;
3120 security_sb_clone_mnt_opts(data->sb, s);
3122 nfs_free_fhandle(mntfh);
3123 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3127 nfs_free_server(server);
3129 nfs_free_fhandle(mntfh);
3131 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3132 return ERR_PTR(error);
3135 if (server && !s->s_root)
3136 bdi_unregister(&server->backing_dev_info);
3138 deactivate_locked_super(s);
3139 nfs_free_fhandle(mntfh);
3140 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3141 return ERR_PTR(error);
3145 * Create an NFS4 server record on referral traversal
3147 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3148 int flags, const char *dev_name, void *raw_data,
3149 struct vfsmount *mnt)
3151 struct nfs_clone_mount *data = raw_data;
3153 struct vfsmount *root_mnt;
3156 dprintk("--> nfs4_referral_get_sb()\n");
3158 export_path = data->mnt_path;
3159 data->mnt_path = "/";
3161 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3162 flags, data, data->hostname);
3163 data->mnt_path = export_path;
3165 error = PTR_ERR(root_mnt);
3166 if (IS_ERR(root_mnt))
3169 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3171 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3172 error != 0 ? " [error]" : "");
3176 #endif /* CONFIG_NFS_V4 */