4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/nfs_xdr.h>
52 #include <linux/magic.h>
53 #include <linux/parser.h>
55 #include <asm/system.h>
56 #include <asm/uaccess.h>
60 #include "delegation.h"
64 #define NFSDBG_FACILITY NFSDBG_VFS
67 /* Mount options that take no arguments */
69 Opt_posix, Opt_noposix,
74 Opt_udp, Opt_tcp, Opt_rdma,
76 Opt_rdirplus, Opt_nordirplus,
77 Opt_sharecache, Opt_nosharecache,
79 /* Mount options that take integer arguments */
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
91 /* Mount options that take string arguments */
92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
93 Opt_addr, Opt_mountaddr, Opt_clientaddr,
95 /* Special mount options */
96 Opt_userspace, Opt_deprecated, Opt_sloppy,
101 static match_table_t nfs_mount_option_tokens = {
102 { Opt_userspace, "bg" },
103 { Opt_userspace, "fg" },
104 { Opt_userspace, "retry=%s" },
106 { Opt_sloppy, "sloppy" },
108 { Opt_soft, "soft" },
109 { Opt_hard, "hard" },
110 { Opt_deprecated, "intr" },
111 { Opt_deprecated, "nointr" },
112 { Opt_posix, "posix" },
113 { Opt_noposix, "noposix" },
115 { Opt_nocto, "nocto" },
117 { Opt_noac, "noac" },
118 { Opt_lock, "lock" },
119 { Opt_nolock, "nolock" },
124 { Opt_rdma, "rdma" },
126 { Opt_noacl, "noacl" },
127 { Opt_rdirplus, "rdirplus" },
128 { Opt_nordirplus, "nordirplus" },
129 { Opt_sharecache, "sharecache" },
130 { Opt_nosharecache, "nosharecache" },
132 { Opt_port, "port=%u" },
133 { Opt_rsize, "rsize=%u" },
134 { Opt_wsize, "wsize=%u" },
135 { Opt_bsize, "bsize=%u" },
136 { Opt_timeo, "timeo=%u" },
137 { Opt_retrans, "retrans=%u" },
138 { Opt_acregmin, "acregmin=%u" },
139 { Opt_acregmax, "acregmax=%u" },
140 { Opt_acdirmin, "acdirmin=%u" },
141 { Opt_acdirmax, "acdirmax=%u" },
142 { Opt_actimeo, "actimeo=%u" },
143 { Opt_namelen, "namlen=%u" },
144 { Opt_mountport, "mountport=%u" },
145 { Opt_mountvers, "mountvers=%u" },
146 { Opt_nfsvers, "nfsvers=%u" },
147 { Opt_nfsvers, "vers=%u" },
149 { Opt_sec, "sec=%s" },
150 { Opt_proto, "proto=%s" },
151 { Opt_mountproto, "mountproto=%s" },
152 { Opt_addr, "addr=%s" },
153 { Opt_clientaddr, "clientaddr=%s" },
154 { Opt_mounthost, "mounthost=%s" },
155 { Opt_mountaddr, "mountaddr=%s" },
161 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
166 static match_table_t nfs_xprt_protocol_tokens = {
167 { Opt_xprt_udp, "udp" },
168 { Opt_xprt_tcp, "tcp" },
169 { Opt_xprt_rdma, "rdma" },
171 { Opt_xprt_err, NULL }
175 Opt_sec_none, Opt_sec_sys,
176 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
177 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
178 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
183 static match_table_t nfs_secflavor_tokens = {
184 { Opt_sec_none, "none" },
185 { Opt_sec_none, "null" },
186 { Opt_sec_sys, "sys" },
188 { Opt_sec_krb5, "krb5" },
189 { Opt_sec_krb5i, "krb5i" },
190 { Opt_sec_krb5p, "krb5p" },
192 { Opt_sec_lkey, "lkey" },
193 { Opt_sec_lkeyi, "lkeyi" },
194 { Opt_sec_lkeyp, "lkeyp" },
196 { Opt_sec_spkm, "spkm3" },
197 { Opt_sec_spkmi, "spkm3i" },
198 { Opt_sec_spkmp, "spkm3p" },
200 { Opt_sec_err, NULL }
204 static void nfs_umount_begin(struct super_block *);
205 static int nfs_statfs(struct dentry *, struct kstatfs *);
206 static int nfs_show_options(struct seq_file *, struct vfsmount *);
207 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
208 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
209 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
210 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
211 static void nfs_kill_super(struct super_block *);
212 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
214 static struct file_system_type nfs_fs_type = {
215 .owner = THIS_MODULE,
217 .get_sb = nfs_get_sb,
218 .kill_sb = nfs_kill_super,
219 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
222 struct file_system_type nfs_xdev_fs_type = {
223 .owner = THIS_MODULE,
225 .get_sb = nfs_xdev_get_sb,
226 .kill_sb = nfs_kill_super,
227 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
230 static const struct super_operations nfs_sops = {
231 .alloc_inode = nfs_alloc_inode,
232 .destroy_inode = nfs_destroy_inode,
233 .write_inode = nfs_write_inode,
234 .statfs = nfs_statfs,
235 .clear_inode = nfs_clear_inode,
236 .umount_begin = nfs_umount_begin,
237 .show_options = nfs_show_options,
238 .show_stats = nfs_show_stats,
239 .remount_fs = nfs_remount,
243 static int nfs4_get_sb(struct file_system_type *fs_type,
244 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
245 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
247 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
248 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
249 static void nfs4_kill_super(struct super_block *sb);
251 static struct file_system_type nfs4_fs_type = {
252 .owner = THIS_MODULE,
254 .get_sb = nfs4_get_sb,
255 .kill_sb = nfs4_kill_super,
256 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
259 struct file_system_type nfs4_xdev_fs_type = {
260 .owner = THIS_MODULE,
262 .get_sb = nfs4_xdev_get_sb,
263 .kill_sb = nfs4_kill_super,
264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
267 struct file_system_type nfs4_referral_fs_type = {
268 .owner = THIS_MODULE,
270 .get_sb = nfs4_referral_get_sb,
271 .kill_sb = nfs4_kill_super,
272 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
275 static const struct super_operations nfs4_sops = {
276 .alloc_inode = nfs_alloc_inode,
277 .destroy_inode = nfs_destroy_inode,
278 .write_inode = nfs_write_inode,
279 .statfs = nfs_statfs,
280 .clear_inode = nfs4_clear_inode,
281 .umount_begin = nfs_umount_begin,
282 .show_options = nfs_show_options,
283 .show_stats = nfs_show_stats,
284 .remount_fs = nfs_remount,
288 static struct shrinker acl_shrinker = {
289 .shrink = nfs_access_cache_shrinker,
290 .seeks = DEFAULT_SEEKS,
294 * Register the NFS filesystems
296 int __init register_nfs_fs(void)
300 ret = register_filesystem(&nfs_fs_type);
304 ret = nfs_register_sysctl();
308 ret = register_filesystem(&nfs4_fs_type);
312 register_shrinker(&acl_shrinker);
317 nfs_unregister_sysctl();
320 unregister_filesystem(&nfs_fs_type);
326 * Unregister the NFS filesystems
328 void __exit unregister_nfs_fs(void)
330 unregister_shrinker(&acl_shrinker);
332 unregister_filesystem(&nfs4_fs_type);
334 nfs_unregister_sysctl();
335 unregister_filesystem(&nfs_fs_type);
338 void nfs_sb_active(struct super_block *sb)
340 struct nfs_server *server = NFS_SB(sb);
342 if (atomic_inc_return(&server->active) == 1)
343 atomic_inc(&sb->s_active);
346 void nfs_sb_deactive(struct super_block *sb)
348 struct nfs_server *server = NFS_SB(sb);
350 if (atomic_dec_and_test(&server->active))
351 deactivate_super(sb);
355 * Deliver file system statistics to userspace
357 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
359 struct nfs_server *server = NFS_SB(dentry->d_sb);
360 unsigned char blockbits;
361 unsigned long blockres;
362 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
363 struct nfs_fattr fattr;
364 struct nfs_fsstat res = {
369 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
372 buf->f_type = NFS_SUPER_MAGIC;
375 * Current versions of glibc do not correctly handle the
376 * case where f_frsize != f_bsize. Eventually we want to
377 * report the value of wtmult in this field.
379 buf->f_frsize = dentry->d_sb->s_blocksize;
382 * On most *nix systems, f_blocks, f_bfree, and f_bavail
383 * are reported in units of f_frsize. Linux hasn't had
384 * an f_frsize field in its statfs struct until recently,
385 * thus historically Linux's sys_statfs reports these
386 * fields in units of f_bsize.
388 buf->f_bsize = dentry->d_sb->s_blocksize;
389 blockbits = dentry->d_sb->s_blocksize_bits;
390 blockres = (1 << blockbits) - 1;
391 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
392 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
393 buf->f_bavail = (res.abytes + blockres) >> blockbits;
395 buf->f_files = res.tfiles;
396 buf->f_ffree = res.afiles;
398 buf->f_namelen = server->namelen;
403 dprintk("%s: statfs error = %d\n", __func__, -error);
408 * Map the security flavour number to a name
410 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
412 static const struct {
413 rpc_authflavor_t flavour;
416 { RPC_AUTH_NULL, "null" },
417 { RPC_AUTH_UNIX, "sys" },
418 { RPC_AUTH_GSS_KRB5, "krb5" },
419 { RPC_AUTH_GSS_KRB5I, "krb5i" },
420 { RPC_AUTH_GSS_KRB5P, "krb5p" },
421 { RPC_AUTH_GSS_LKEY, "lkey" },
422 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
423 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
424 { RPC_AUTH_GSS_SPKM, "spkm" },
425 { RPC_AUTH_GSS_SPKMI, "spkmi" },
426 { RPC_AUTH_GSS_SPKMP, "spkmp" },
427 { UINT_MAX, "unknown" }
431 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
432 if (sec_flavours[i].flavour == flavour)
435 return sec_flavours[i].str;
438 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
441 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
443 switch (sap->sa_family) {
445 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
446 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
447 NIPQUAD(sin->sin_addr.s_addr));
451 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
452 seq_printf(m, ",mountaddr=" NIP6_FMT,
453 NIP6(sin6->sin6_addr));
458 seq_printf(m, ",mountaddr=unspecified");
461 if (nfss->mountd_version || showdefaults)
462 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
463 if (nfss->mountd_port || showdefaults)
464 seq_printf(m, ",mountport=%u", nfss->mountd_port);
466 switch (nfss->mountd_protocol) {
468 seq_printf(m, ",mountproto=udp");
471 seq_printf(m, ",mountproto=tcp");
475 seq_printf(m, ",mountproto=auto");
480 * Describe the mount options in force on this server representation
482 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
485 static const struct proc_nfs_info {
490 { NFS_MOUNT_SOFT, ",soft", ",hard" },
491 { NFS_MOUNT_INTR, ",intr", ",nointr" },
492 { NFS_MOUNT_POSIX, ",posix", "" },
493 { NFS_MOUNT_NOCTO, ",nocto", "" },
494 { NFS_MOUNT_NOAC, ",noac", "" },
495 { NFS_MOUNT_NONLM, ",nolock", "" },
496 { NFS_MOUNT_NOACL, ",noacl", "" },
497 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
498 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
501 const struct proc_nfs_info *nfs_infop;
502 struct nfs_client *clp = nfss->nfs_client;
503 u32 version = clp->rpc_ops->version;
505 seq_printf(m, ",vers=%u", version);
506 seq_printf(m, ",rsize=%u", nfss->rsize);
507 seq_printf(m, ",wsize=%u", nfss->wsize);
508 if (nfss->bsize != 0)
509 seq_printf(m, ",bsize=%u", nfss->bsize);
510 seq_printf(m, ",namlen=%u", nfss->namelen);
511 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
512 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
513 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
514 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
515 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
516 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
517 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
518 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
519 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
520 if (nfss->flags & nfs_infop->flag)
521 seq_puts(m, nfs_infop->str);
523 seq_puts(m, nfs_infop->nostr);
525 seq_printf(m, ",proto=%s",
526 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
528 if (nfss->port != NFS_PORT)
529 seq_printf(m, ",port=%u", nfss->port);
532 seq_printf(m, ",port=%u", nfss->port);
534 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
535 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
536 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
539 nfs_show_mountd_options(m, nfss, showdefaults);
542 if (clp->rpc_ops->version == 4)
543 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
548 * Describe the mount options on this VFS mountpoint
550 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
552 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
554 nfs_show_mount_options(m, nfss, 0);
556 seq_printf(m, ",addr=%s",
557 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
564 * Present statistical information for this VFS mountpoint
566 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
569 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
570 struct rpc_auth *auth = nfss->client->cl_auth;
571 struct nfs_iostats totals = { };
573 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
576 * Display all mount option settings
578 seq_printf(m, "\n\topts:\t");
579 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
580 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
581 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
582 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
583 nfs_show_mount_options(m, nfss, 1);
585 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
587 seq_printf(m, "\n\tcaps:\t");
588 seq_printf(m, "caps=0x%x", nfss->caps);
589 seq_printf(m, ",wtmult=%u", nfss->wtmult);
590 seq_printf(m, ",dtsize=%u", nfss->dtsize);
591 seq_printf(m, ",bsize=%u", nfss->bsize);
592 seq_printf(m, ",namlen=%u", nfss->namelen);
595 if (nfss->nfs_client->rpc_ops->version == 4) {
596 seq_printf(m, "\n\tnfsv4:\t");
597 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
598 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
599 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
604 * Display security flavor in effect for this mount
606 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
608 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
611 * Display superblock I/O counters
613 for_each_possible_cpu(cpu) {
614 struct nfs_iostats *stats;
617 stats = per_cpu_ptr(nfss->io_stats, cpu);
619 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
620 totals.events[i] += stats->events[i];
621 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
622 totals.bytes[i] += stats->bytes[i];
627 seq_printf(m, "\n\tevents:\t");
628 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
629 seq_printf(m, "%lu ", totals.events[i]);
630 seq_printf(m, "\n\tbytes:\t");
631 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
632 seq_printf(m, "%Lu ", totals.bytes[i]);
635 rpc_print_iostats(m, nfss->client);
641 * Begin unmount by attempting to remove all automounted mountpoints we added
642 * in response to xdev traversals and referrals
644 static void nfs_umount_begin(struct super_block *sb)
646 struct nfs_server *server = NFS_SB(sb);
647 struct rpc_clnt *rpc;
649 /* -EIO all pending I/O */
650 rpc = server->client_acl;
652 rpc_killall_tasks(rpc);
653 rpc = server->client;
655 rpc_killall_tasks(rpc);
659 * Set the port number in an address. Be agnostic about the address family.
661 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
663 switch (sap->sa_family) {
665 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
666 ap->sin_port = htons(port);
670 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
671 ap->sin6_port = htons(port);
678 * Sanity-check a server address provided by the mount command.
680 * Address family must be initialized, and address must not be
681 * the ANY address for that family.
683 static int nfs_verify_server_address(struct sockaddr *addr)
685 switch (addr->sa_family) {
687 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
688 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
691 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
692 return !ipv6_addr_any(sa);
699 static void nfs_parse_ipv4_address(char *string, size_t str_len,
700 struct sockaddr *sap, size_t *addr_len)
702 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
703 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
705 if (str_len <= INET_ADDRSTRLEN) {
706 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
707 (int)str_len, string);
709 sin->sin_family = AF_INET;
710 *addr_len = sizeof(*sin);
711 if (in4_pton(string, str_len, addr, '\0', NULL))
715 sap->sa_family = AF_UNSPEC;
719 #define IPV6_SCOPE_DELIMITER '%'
721 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
722 static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
724 struct sockaddr_in6 *sin6)
729 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
731 if (*delim != IPV6_SCOPE_DELIMITER)
734 len = (string + str_len) - delim - 1;
735 p = kstrndup(delim + 1, len, GFP_KERNEL);
737 unsigned long scope_id = 0;
738 struct net_device *dev;
740 dev = dev_get_by_name(&init_net, p);
742 scope_id = dev->ifindex;
745 /* scope_id is set to zero on error */
746 strict_strtoul(p, 10, &scope_id);
750 sin6->sin6_scope_id = scope_id;
751 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
755 static void nfs_parse_ipv6_address(char *string, size_t str_len,
756 struct sockaddr *sap, size_t *addr_len)
758 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
759 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
762 if (str_len <= INET6_ADDRSTRLEN) {
763 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
764 (int)str_len, string);
766 sin6->sin6_family = AF_INET6;
767 *addr_len = sizeof(*sin6);
768 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
769 nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
774 sap->sa_family = AF_UNSPEC;
778 static void nfs_parse_ipv6_address(char *string, size_t str_len,
779 struct sockaddr *sap, size_t *addr_len)
781 sap->sa_family = AF_UNSPEC;
787 * Construct a sockaddr based on the contents of a string that contains
788 * an IP address in presentation format.
790 * If there is a problem constructing the new sockaddr, set the address
791 * family to AF_UNSPEC.
793 static void nfs_parse_ip_address(char *string, size_t str_len,
794 struct sockaddr *sap, size_t *addr_len)
796 unsigned int i, colons;
799 for (i = 0; i < str_len; i++)
800 if (string[i] == ':')
804 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
806 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
810 * Sanity check the NFS transport protocol.
813 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
815 switch (mnt->nfs_server.protocol) {
816 case XPRT_TRANSPORT_UDP:
817 case XPRT_TRANSPORT_TCP:
818 case XPRT_TRANSPORT_RDMA:
821 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
826 * For text based NFSv2/v3 mounts, the mount protocol transport default
827 * settings should depend upon the specified NFS transport.
829 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
831 nfs_validate_transport_protocol(mnt);
833 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
834 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
836 switch (mnt->nfs_server.protocol) {
837 case XPRT_TRANSPORT_UDP:
838 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
840 case XPRT_TRANSPORT_TCP:
841 case XPRT_TRANSPORT_RDMA:
842 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
847 * Parse the value of the 'sec=' option.
849 * The flavor_len setting is for v4 mounts.
851 static int nfs_parse_security_flavors(char *value,
852 struct nfs_parsed_mount_data *mnt)
854 substring_t args[MAX_OPT_ARGS];
856 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
858 switch (match_token(value, nfs_secflavor_tokens, args)) {
860 mnt->auth_flavor_len = 0;
861 mnt->auth_flavors[0] = RPC_AUTH_NULL;
864 mnt->auth_flavor_len = 0;
865 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
868 mnt->auth_flavor_len = 1;
869 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
872 mnt->auth_flavor_len = 1;
873 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
876 mnt->auth_flavor_len = 1;
877 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
880 mnt->auth_flavor_len = 1;
881 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
884 mnt->auth_flavor_len = 1;
885 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
888 mnt->auth_flavor_len = 1;
889 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
892 mnt->auth_flavor_len = 1;
893 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
896 mnt->auth_flavor_len = 1;
897 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
900 mnt->auth_flavor_len = 1;
901 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
910 static void nfs_parse_invalid_value(const char *option)
912 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
916 * Error-check and convert a string of mount options from user space into
917 * a data structure. The whole mount string is processed; bad options are
918 * skipped as they are encountered. If there were no errors, return 1;
919 * otherwise return 0 (zero).
921 static int nfs_parse_mount_options(char *raw,
922 struct nfs_parsed_mount_data *mnt)
924 char *p, *string, *secdata;
925 int rc, sloppy = 0, errors = 0;
928 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
931 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
933 secdata = alloc_secdata();
937 rc = security_sb_copy_data(raw, secdata);
939 goto out_security_failure;
941 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
943 goto out_security_failure;
945 free_secdata(secdata);
947 while ((p = strsep(&raw, ",")) != NULL) {
948 substring_t args[MAX_OPT_ARGS];
954 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
956 token = match_token(p, nfs_mount_option_tokens, args);
960 * boolean options: foo/nofoo
963 mnt->flags |= NFS_MOUNT_SOFT;
966 mnt->flags &= ~NFS_MOUNT_SOFT;
969 mnt->flags |= NFS_MOUNT_POSIX;
972 mnt->flags &= ~NFS_MOUNT_POSIX;
975 mnt->flags &= ~NFS_MOUNT_NOCTO;
978 mnt->flags |= NFS_MOUNT_NOCTO;
981 mnt->flags &= ~NFS_MOUNT_NOAC;
984 mnt->flags |= NFS_MOUNT_NOAC;
987 mnt->flags &= ~NFS_MOUNT_NONLM;
990 mnt->flags |= NFS_MOUNT_NONLM;
993 mnt->flags &= ~NFS_MOUNT_VER3;
996 mnt->flags |= NFS_MOUNT_VER3;
999 mnt->flags &= ~NFS_MOUNT_TCP;
1000 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1003 mnt->flags |= NFS_MOUNT_TCP;
1004 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1007 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1008 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1011 mnt->flags &= ~NFS_MOUNT_NOACL;
1014 mnt->flags |= NFS_MOUNT_NOACL;
1017 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1019 case Opt_nordirplus:
1020 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1022 case Opt_sharecache:
1023 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1025 case Opt_nosharecache:
1026 mnt->flags |= NFS_MOUNT_UNSHARED;
1030 * options that take numeric values
1033 if (match_int(args, &option) ||
1034 option < 0 || option > USHORT_MAX) {
1036 nfs_parse_invalid_value("port");
1038 mnt->nfs_server.port = option;
1041 if (match_int(args, &option) || option < 0) {
1043 nfs_parse_invalid_value("rsize");
1045 mnt->rsize = option;
1048 if (match_int(args, &option) || option < 0) {
1050 nfs_parse_invalid_value("wsize");
1052 mnt->wsize = option;
1055 if (match_int(args, &option) || option < 0) {
1057 nfs_parse_invalid_value("bsize");
1059 mnt->bsize = option;
1062 if (match_int(args, &option) || option <= 0) {
1064 nfs_parse_invalid_value("timeo");
1066 mnt->timeo = option;
1069 if (match_int(args, &option) || option <= 0) {
1071 nfs_parse_invalid_value("retrans");
1073 mnt->retrans = option;
1076 if (match_int(args, &option) || option < 0) {
1078 nfs_parse_invalid_value("acregmin");
1080 mnt->acregmin = option;
1083 if (match_int(args, &option) || option < 0) {
1085 nfs_parse_invalid_value("acregmax");
1087 mnt->acregmax = option;
1090 if (match_int(args, &option) || option < 0) {
1092 nfs_parse_invalid_value("acdirmin");
1094 mnt->acdirmin = option;
1097 if (match_int(args, &option) || option < 0) {
1099 nfs_parse_invalid_value("acdirmax");
1101 mnt->acdirmax = option;
1104 if (match_int(args, &option) || option < 0) {
1106 nfs_parse_invalid_value("actimeo");
1108 mnt->acregmin = mnt->acregmax =
1109 mnt->acdirmin = mnt->acdirmax = option;
1112 if (match_int(args, &option) || option < 0) {
1114 nfs_parse_invalid_value("namlen");
1116 mnt->namlen = option;
1119 if (match_int(args, &option) ||
1120 option < 0 || option > USHORT_MAX) {
1122 nfs_parse_invalid_value("mountport");
1124 mnt->mount_server.port = option;
1127 if (match_int(args, &option) ||
1128 option < NFS_MNT_VERSION ||
1129 option > NFS_MNT3_VERSION) {
1131 nfs_parse_invalid_value("mountvers");
1133 mnt->mount_server.version = option;
1136 if (match_int(args, &option)) {
1138 nfs_parse_invalid_value("nfsvers");
1143 mnt->flags &= ~NFS_MOUNT_VER3;
1146 mnt->flags |= NFS_MOUNT_VER3;
1150 nfs_parse_invalid_value("nfsvers");
1155 * options that take text values
1158 string = match_strdup(args);
1161 rc = nfs_parse_security_flavors(string, mnt);
1165 dfprintk(MOUNT, "NFS: unrecognized "
1166 "security flavor\n");
1170 string = match_strdup(args);
1173 token = match_token(string,
1174 nfs_xprt_protocol_tokens, args);
1179 mnt->flags &= ~NFS_MOUNT_TCP;
1180 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1183 mnt->flags |= NFS_MOUNT_TCP;
1184 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1187 /* vector side protocols to TCP */
1188 mnt->flags |= NFS_MOUNT_TCP;
1189 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1193 dfprintk(MOUNT, "NFS: unrecognized "
1194 "transport protocol\n");
1197 case Opt_mountproto:
1198 string = match_strdup(args);
1201 token = match_token(string,
1202 nfs_xprt_protocol_tokens, args);
1207 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1210 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1212 case Opt_xprt_rdma: /* not used for side protocols */
1215 dfprintk(MOUNT, "NFS: unrecognized "
1216 "transport protocol\n");
1220 string = match_strdup(args);
1223 nfs_parse_ip_address(string, strlen(string),
1225 &mnt->nfs_server.address,
1226 &mnt->nfs_server.addrlen);
1229 case Opt_clientaddr:
1230 string = match_strdup(args);
1233 kfree(mnt->client_address);
1234 mnt->client_address = string;
1237 string = match_strdup(args);
1240 kfree(mnt->mount_server.hostname);
1241 mnt->mount_server.hostname = string;
1244 string = match_strdup(args);
1247 nfs_parse_ip_address(string, strlen(string),
1249 &mnt->mount_server.address,
1250 &mnt->mount_server.addrlen);
1259 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1262 case Opt_deprecated:
1263 dfprintk(MOUNT, "NFS: ignoring mount option "
1269 dfprintk(MOUNT, "NFS: unrecognized mount option "
1275 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1276 errors, (errors == 1 ? "" : "s"));
1283 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1285 out_security_failure:
1286 free_secdata(secdata);
1287 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1292 * Use the remote server's MOUNT service to request the NFS file handle
1293 * corresponding to the provided path.
1295 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1296 struct nfs_fh *root_fh)
1298 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1302 if (args->mount_server.version == 0) {
1303 if (args->flags & NFS_MOUNT_VER3)
1304 args->mount_server.version = NFS_MNT3_VERSION;
1306 args->mount_server.version = NFS_MNT_VERSION;
1309 if (args->mount_server.hostname)
1310 hostname = args->mount_server.hostname;
1312 hostname = args->nfs_server.hostname;
1315 * Construct the mount server's address.
1317 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1318 memcpy(sap, &args->nfs_server.address,
1319 args->nfs_server.addrlen);
1320 args->mount_server.addrlen = args->nfs_server.addrlen;
1324 * autobind will be used if mount_server.port == 0
1326 nfs_set_port(sap, args->mount_server.port);
1329 * Now ask the mount server to map our export path
1332 status = nfs_mount(sap,
1333 args->mount_server.addrlen,
1335 args->nfs_server.export_path,
1336 args->mount_server.version,
1337 args->mount_server.protocol,
1342 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1347 static int nfs_parse_simple_hostname(const char *dev_name,
1348 char **hostname, size_t maxnamlen,
1349 char **export_path, size_t maxpathlen)
1352 char *colon, *comma;
1354 colon = strchr(dev_name, ':');
1356 goto out_bad_devname;
1358 len = colon - dev_name;
1359 if (len > maxnamlen)
1362 /* N.B. caller will free nfs_server.hostname in all cases */
1363 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1367 /* kill possible hostname list: not supported */
1368 comma = strchr(*hostname, ',');
1369 if (comma != NULL) {
1370 if (comma == *hostname)
1371 goto out_bad_devname;
1376 len = strlen(colon);
1377 if (len > maxpathlen)
1379 *export_path = kstrndup(colon, len, GFP_KERNEL);
1383 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1387 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1391 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1395 dfprintk(MOUNT, "NFS: server hostname too long\n");
1396 return -ENAMETOOLONG;
1399 dfprintk(MOUNT, "NFS: export pathname too long\n");
1400 return -ENAMETOOLONG;
1404 * Hostname has square brackets around it because it contains one or
1405 * more colons. We look for the first closing square bracket, and a
1406 * colon must follow it.
1408 static int nfs_parse_protected_hostname(const char *dev_name,
1409 char **hostname, size_t maxnamlen,
1410 char **export_path, size_t maxpathlen)
1415 start = (char *)(dev_name + 1);
1417 end = strchr(start, ']');
1419 goto out_bad_devname;
1420 if (*(end + 1) != ':')
1421 goto out_bad_devname;
1424 if (len > maxnamlen)
1427 /* N.B. caller will free nfs_server.hostname in all cases */
1428 *hostname = kstrndup(start, len, GFP_KERNEL);
1429 if (*hostname == NULL)
1434 if (len > maxpathlen)
1436 *export_path = kstrndup(end, len, GFP_KERNEL);
1443 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1447 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1451 dfprintk(MOUNT, "NFS: server hostname too long\n");
1452 return -ENAMETOOLONG;
1455 dfprintk(MOUNT, "NFS: export pathname too long\n");
1456 return -ENAMETOOLONG;
1460 * Split "dev_name" into "hostname:export_path".
1462 * The leftmost colon demarks the split between the server's hostname
1463 * and the export path. If the hostname starts with a left square
1464 * bracket, then it may contain colons.
1466 * Note: caller frees hostname and export path, even on error.
1468 static int nfs_parse_devname(const char *dev_name,
1469 char **hostname, size_t maxnamlen,
1470 char **export_path, size_t maxpathlen)
1472 if (*dev_name == '[')
1473 return nfs_parse_protected_hostname(dev_name,
1474 hostname, maxnamlen,
1475 export_path, maxpathlen);
1477 return nfs_parse_simple_hostname(dev_name,
1478 hostname, maxnamlen,
1479 export_path, maxpathlen);
1483 * Validate the NFS2/NFS3 mount data
1484 * - fills in the mount root filehandle
1486 * For option strings, user space handles the following behaviors:
1488 * + DNS: mapping server host name to IP address ("addr=" option)
1490 * + failure mode: how to behave if a mount request can't be handled
1491 * immediately ("fg/bg" option)
1493 * + retry: how often to retry a mount request ("retry=" option)
1495 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1496 * mountproto=tcp after mountproto=udp, and so on
1498 static int nfs_validate_mount_data(void *options,
1499 struct nfs_parsed_mount_data *args,
1500 struct nfs_fh *mntfh,
1501 const char *dev_name)
1503 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1508 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1509 args->rsize = NFS_MAX_FILE_IO_SIZE;
1510 args->wsize = NFS_MAX_FILE_IO_SIZE;
1511 args->acregmin = NFS_DEF_ACREGMIN;
1512 args->acregmax = NFS_DEF_ACREGMAX;
1513 args->acdirmin = NFS_DEF_ACDIRMIN;
1514 args->acdirmax = NFS_DEF_ACDIRMAX;
1515 args->mount_server.port = 0; /* autobind unless user sets port */
1516 args->nfs_server.port = 0; /* autobind unless user sets port */
1517 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1518 args->auth_flavors[0] = RPC_AUTH_UNIX;
1520 switch (data->version) {
1526 if (data->flags & NFS_MOUNT_VER3)
1528 data->root.size = NFS2_FHSIZE;
1529 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1531 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1534 memset(data->context, 0, sizeof(data->context));
1536 if (data->flags & NFS_MOUNT_VER3) {
1537 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1538 goto out_invalid_fh;
1539 mntfh->size = data->root.size;
1541 mntfh->size = NFS2_FHSIZE;
1544 memcpy(mntfh->data, data->root.data, mntfh->size);
1545 if (mntfh->size < sizeof(mntfh->data))
1546 memset(mntfh->data + mntfh->size, 0,
1547 sizeof(mntfh->data) - mntfh->size);
1550 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1553 args->flags = data->flags;
1554 args->rsize = data->rsize;
1555 args->wsize = data->wsize;
1556 args->timeo = data->timeo;
1557 args->retrans = data->retrans;
1558 args->acregmin = data->acregmin;
1559 args->acregmax = data->acregmax;
1560 args->acdirmin = data->acdirmin;
1561 args->acdirmax = data->acdirmax;
1563 memcpy(&args->nfs_server.address, &data->addr,
1564 sizeof(data->addr));
1565 args->nfs_server.addrlen = sizeof(data->addr);
1566 if (!nfs_verify_server_address((struct sockaddr *)
1567 &args->nfs_server.address))
1568 goto out_no_address;
1570 if (!(data->flags & NFS_MOUNT_TCP))
1571 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1572 /* N.B. caller will free nfs_server.hostname in all cases */
1573 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1574 args->namlen = data->namlen;
1575 args->bsize = data->bsize;
1577 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1578 args->auth_flavors[0] = data->pseudoflavor;
1579 if (!args->nfs_server.hostname)
1583 * The legacy version 6 binary mount data from userspace has a
1584 * field used only to transport selinux information into the
1585 * the kernel. To continue to support that functionality we
1586 * have a touch of selinux knowledge here in the NFS code. The
1587 * userspace code converted context=blah to just blah so we are
1588 * converting back to the full string selinux understands.
1590 if (data->context[0]){
1591 #ifdef CONFIG_SECURITY_SELINUX
1593 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1596 strcpy(opts_str, "context=");
1597 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1598 strcat(opts_str, &data->context[0]);
1599 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1612 if (nfs_parse_mount_options((char *)options, args) == 0)
1615 if (!nfs_verify_server_address((struct sockaddr *)
1616 &args->nfs_server.address))
1617 goto out_no_address;
1619 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1620 args->nfs_server.port);
1622 nfs_set_mount_transport_protocol(args);
1624 status = nfs_parse_devname(dev_name,
1625 &args->nfs_server.hostname,
1627 &args->nfs_server.export_path,
1630 status = nfs_try_mount(args, mntfh);
1632 kfree(args->nfs_server.export_path);
1633 args->nfs_server.export_path = NULL;
1642 #ifndef CONFIG_NFS_V3
1643 if (args->flags & NFS_MOUNT_VER3)
1644 goto out_v3_not_compiled;
1645 #endif /* !CONFIG_NFS_V3 */
1650 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1654 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1659 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1662 #ifndef CONFIG_NFS_V3
1663 out_v3_not_compiled:
1664 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1665 return -EPROTONOSUPPORT;
1666 #endif /* !CONFIG_NFS_V3 */
1669 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1673 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1677 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1682 nfs_compare_remount_data(struct nfs_server *nfss,
1683 struct nfs_parsed_mount_data *data)
1685 if (data->flags != nfss->flags ||
1686 data->rsize != nfss->rsize ||
1687 data->wsize != nfss->wsize ||
1688 data->retrans != nfss->client->cl_timeout->to_retries ||
1689 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1690 data->acregmin != nfss->acregmin / HZ ||
1691 data->acregmax != nfss->acregmax / HZ ||
1692 data->acdirmin != nfss->acdirmin / HZ ||
1693 data->acdirmax != nfss->acdirmax / HZ ||
1694 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1695 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1696 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1697 data->nfs_server.addrlen) != 0)
1704 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1707 struct nfs_server *nfss = sb->s_fs_info;
1708 struct nfs_parsed_mount_data *data;
1709 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1710 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1711 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1714 * Userspace mount programs that send binary options generally send
1715 * them populated with default values. We have no way to know which
1716 * ones were explicitly specified. Fall back to legacy behavior and
1717 * just return success.
1719 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1720 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1721 options->version <= 6))))
1724 data = kzalloc(sizeof(*data), GFP_KERNEL);
1728 /* fill out struct with values from existing mount */
1729 data->flags = nfss->flags;
1730 data->rsize = nfss->rsize;
1731 data->wsize = nfss->wsize;
1732 data->retrans = nfss->client->cl_timeout->to_retries;
1733 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1734 data->acregmin = nfss->acregmin / HZ;
1735 data->acregmax = nfss->acregmax / HZ;
1736 data->acdirmin = nfss->acdirmin / HZ;
1737 data->acdirmax = nfss->acdirmax / HZ;
1738 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1739 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1740 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1741 data->nfs_server.addrlen);
1743 /* overwrite those values with any that were specified */
1744 error = nfs_parse_mount_options((char *)options, data);
1748 /* compare new mount options with old ones */
1749 error = nfs_compare_remount_data(nfss, data);
1756 * Initialise the common bits of the superblock
1758 static inline void nfs_initialise_sb(struct super_block *sb)
1760 struct nfs_server *server = NFS_SB(sb);
1762 sb->s_magic = NFS_SUPER_MAGIC;
1764 /* We probably want something more informative here */
1765 snprintf(sb->s_id, sizeof(sb->s_id),
1766 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1768 if (sb->s_blocksize == 0)
1769 sb->s_blocksize = nfs_block_bits(server->wsize,
1770 &sb->s_blocksize_bits);
1772 if (server->flags & NFS_MOUNT_NOAC)
1773 sb->s_flags |= MS_SYNCHRONOUS;
1775 nfs_super_set_maxbytes(sb, server->maxfilesize);
1779 * Finish setting up an NFS2/3 superblock
1781 static void nfs_fill_super(struct super_block *sb,
1782 struct nfs_parsed_mount_data *data)
1784 struct nfs_server *server = NFS_SB(sb);
1786 sb->s_blocksize_bits = 0;
1787 sb->s_blocksize = 0;
1789 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1791 if (server->flags & NFS_MOUNT_VER3) {
1792 /* The VFS shouldn't apply the umask to mode bits. We will do
1793 * so ourselves when necessary.
1795 sb->s_flags |= MS_POSIXACL;
1796 sb->s_time_gran = 1;
1799 sb->s_op = &nfs_sops;
1800 nfs_initialise_sb(sb);
1804 * Finish setting up a cloned NFS2/3 superblock
1806 static void nfs_clone_super(struct super_block *sb,
1807 const struct super_block *old_sb)
1809 struct nfs_server *server = NFS_SB(sb);
1811 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1812 sb->s_blocksize = old_sb->s_blocksize;
1813 sb->s_maxbytes = old_sb->s_maxbytes;
1815 if (server->flags & NFS_MOUNT_VER3) {
1816 /* The VFS shouldn't apply the umask to mode bits. We will do
1817 * so ourselves when necessary.
1819 sb->s_flags |= MS_POSIXACL;
1820 sb->s_time_gran = 1;
1823 sb->s_op = old_sb->s_op;
1824 nfs_initialise_sb(sb);
1827 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1829 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1831 const struct nfs_server *a = s->s_fs_info;
1832 const struct rpc_clnt *clnt_a = a->client;
1833 const struct rpc_clnt *clnt_b = b->client;
1835 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1837 if (a->nfs_client != b->nfs_client)
1839 if (a->flags != b->flags)
1841 if (a->wsize != b->wsize)
1843 if (a->rsize != b->rsize)
1845 if (a->acregmin != b->acregmin)
1847 if (a->acregmax != b->acregmax)
1849 if (a->acdirmin != b->acdirmin)
1851 if (a->acdirmax != b->acdirmax)
1853 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1860 struct nfs_sb_mountdata {
1861 struct nfs_server *server;
1865 static int nfs_set_super(struct super_block *s, void *data)
1867 struct nfs_sb_mountdata *sb_mntdata = data;
1868 struct nfs_server *server = sb_mntdata->server;
1871 s->s_flags = sb_mntdata->mntflags;
1872 s->s_fs_info = server;
1873 ret = set_anon_super(s, server);
1875 server->s_dev = s->s_dev;
1879 static int nfs_compare_super_address(struct nfs_server *server1,
1880 struct nfs_server *server2)
1882 struct sockaddr *sap1, *sap2;
1884 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1885 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1887 if (sap1->sa_family != sap2->sa_family)
1890 switch (sap1->sa_family) {
1892 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1893 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1894 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1896 if (sin1->sin_port != sin2->sin_port)
1901 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1902 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1903 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1905 if (sin1->sin6_port != sin2->sin6_port)
1916 static int nfs_compare_super(struct super_block *sb, void *data)
1918 struct nfs_sb_mountdata *sb_mntdata = data;
1919 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1920 int mntflags = sb_mntdata->mntflags;
1922 if (!nfs_compare_super_address(old, server))
1924 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1925 if (old->flags & NFS_MOUNT_UNSHARED)
1927 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1929 return nfs_compare_mount_options(sb, server, mntflags);
1932 static int nfs_bdi_register(struct nfs_server *server)
1934 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1937 static int nfs_get_sb(struct file_system_type *fs_type,
1938 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1940 struct nfs_server *server = NULL;
1941 struct super_block *s;
1942 struct nfs_parsed_mount_data *data;
1943 struct nfs_fh *mntfh;
1944 struct dentry *mntroot;
1945 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1946 struct nfs_sb_mountdata sb_mntdata = {
1949 int error = -ENOMEM;
1951 data = kzalloc(sizeof(*data), GFP_KERNEL);
1952 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1953 if (data == NULL || mntfh == NULL)
1956 security_init_mnt_opts(&data->lsm_opts);
1958 /* Validate the mount data */
1959 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1963 /* Get a volume representation */
1964 server = nfs_create_server(data, mntfh);
1965 if (IS_ERR(server)) {
1966 error = PTR_ERR(server);
1969 sb_mntdata.server = server;
1971 if (server->flags & NFS_MOUNT_UNSHARED)
1972 compare_super = NULL;
1974 /* Get a superblock - note that we may end up sharing one that already exists */
1975 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1981 if (s->s_fs_info != server) {
1982 nfs_free_server(server);
1985 error = nfs_bdi_register(server);
1987 goto error_splat_super;
1991 /* initial superblock/root creation */
1992 nfs_fill_super(s, data);
1995 mntroot = nfs_get_root(s, mntfh);
1996 if (IS_ERR(mntroot)) {
1997 error = PTR_ERR(mntroot);
1998 goto error_splat_super;
2001 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2003 goto error_splat_root;
2005 s->s_flags |= MS_ACTIVE;
2007 mnt->mnt_root = mntroot;
2011 kfree(data->nfs_server.hostname);
2012 kfree(data->mount_server.hostname);
2013 security_free_mnt_opts(&data->lsm_opts);
2020 nfs_free_server(server);
2026 up_write(&s->s_umount);
2027 deactivate_super(s);
2032 * Destroy an NFS2/3 superblock
2034 static void nfs_kill_super(struct super_block *s)
2036 struct nfs_server *server = NFS_SB(s);
2038 bdi_unregister(&server->backing_dev_info);
2040 nfs_free_server(server);
2044 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2046 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2047 const char *dev_name, void *raw_data,
2048 struct vfsmount *mnt)
2050 struct nfs_clone_mount *data = raw_data;
2051 struct super_block *s;
2052 struct nfs_server *server;
2053 struct dentry *mntroot;
2054 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2055 struct nfs_sb_mountdata sb_mntdata = {
2060 dprintk("--> nfs_xdev_get_sb()\n");
2062 /* create a new volume representation */
2063 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2064 if (IS_ERR(server)) {
2065 error = PTR_ERR(server);
2066 goto out_err_noserver;
2068 sb_mntdata.server = server;
2070 if (server->flags & NFS_MOUNT_UNSHARED)
2071 compare_super = NULL;
2073 /* Get a superblock - note that we may end up sharing one that already exists */
2074 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2080 if (s->s_fs_info != server) {
2081 nfs_free_server(server);
2084 error = nfs_bdi_register(server);
2086 goto error_splat_super;
2090 /* initial superblock/root creation */
2091 nfs_clone_super(s, data->sb);
2094 mntroot = nfs_get_root(s, data->fh);
2095 if (IS_ERR(mntroot)) {
2096 error = PTR_ERR(mntroot);
2097 goto error_splat_super;
2099 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2102 goto error_splat_super;
2105 s->s_flags |= MS_ACTIVE;
2107 mnt->mnt_root = mntroot;
2109 /* clone any lsm security options from the parent to the new sb */
2110 security_sb_clone_mnt_opts(data->sb, s);
2112 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2116 nfs_free_server(server);
2118 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2122 up_write(&s->s_umount);
2123 deactivate_super(s);
2124 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2128 #ifdef CONFIG_NFS_V4
2131 * Finish setting up a cloned NFS4 superblock
2133 static void nfs4_clone_super(struct super_block *sb,
2134 const struct super_block *old_sb)
2136 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2137 sb->s_blocksize = old_sb->s_blocksize;
2138 sb->s_maxbytes = old_sb->s_maxbytes;
2139 sb->s_time_gran = 1;
2140 sb->s_op = old_sb->s_op;
2141 nfs_initialise_sb(sb);
2145 * Set up an NFS4 superblock
2147 static void nfs4_fill_super(struct super_block *sb)
2149 sb->s_time_gran = 1;
2150 sb->s_op = &nfs4_sops;
2151 nfs_initialise_sb(sb);
2155 * Validate NFSv4 mount options
2157 static int nfs4_validate_mount_data(void *options,
2158 struct nfs_parsed_mount_data *args,
2159 const char *dev_name)
2161 struct sockaddr_in *ap;
2162 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2168 args->rsize = NFS_MAX_FILE_IO_SIZE;
2169 args->wsize = NFS_MAX_FILE_IO_SIZE;
2170 args->acregmin = NFS_DEF_ACREGMIN;
2171 args->acregmax = NFS_DEF_ACREGMAX;
2172 args->acdirmin = NFS_DEF_ACDIRMIN;
2173 args->acdirmax = NFS_DEF_ACDIRMAX;
2174 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2175 args->auth_flavors[0] = RPC_AUTH_UNIX;
2176 args->auth_flavor_len = 0;
2178 switch (data->version) {
2180 ap = (struct sockaddr_in *)&args->nfs_server.address;
2181 if (data->host_addrlen > sizeof(args->nfs_server.address))
2182 goto out_no_address;
2183 if (data->host_addrlen == 0)
2184 goto out_no_address;
2185 args->nfs_server.addrlen = data->host_addrlen;
2186 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2188 if (!nfs_verify_server_address((struct sockaddr *)
2189 &args->nfs_server.address))
2190 goto out_no_address;
2192 if (data->auth_flavourlen) {
2193 if (data->auth_flavourlen > 1)
2194 goto out_inval_auth;
2195 if (copy_from_user(&args->auth_flavors[0],
2196 data->auth_flavours,
2197 sizeof(args->auth_flavors[0])))
2201 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2204 args->nfs_server.hostname = c;
2206 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2209 args->nfs_server.export_path = c;
2210 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2212 c = strndup_user(data->client_addr.data, 16);
2215 args->client_address = c;
2218 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2222 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2223 args->rsize = data->rsize;
2224 args->wsize = data->wsize;
2225 args->timeo = data->timeo;
2226 args->retrans = data->retrans;
2227 args->acregmin = data->acregmin;
2228 args->acregmax = data->acregmax;
2229 args->acdirmin = data->acdirmin;
2230 args->acdirmax = data->acdirmax;
2231 args->nfs_server.protocol = data->proto;
2232 nfs_validate_transport_protocol(args);
2238 if (nfs_parse_mount_options((char *)options, args) == 0)
2241 if (!nfs_verify_server_address((struct sockaddr *)
2242 &args->nfs_server.address))
2245 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2246 args->nfs_server.port);
2248 nfs_validate_transport_protocol(args);
2250 if (args->auth_flavor_len > 1)
2251 goto out_inval_auth;
2253 if (args->client_address == NULL)
2254 goto out_no_client_address;
2256 status = nfs_parse_devname(dev_name,
2257 &args->nfs_server.hostname,
2259 &args->nfs_server.export_path,
2271 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2275 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2276 data->auth_flavourlen);
2280 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2283 out_no_client_address:
2284 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2289 * Get the superblock for an NFS4 mountpoint
2291 static int nfs4_get_sb(struct file_system_type *fs_type,
2292 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2294 struct nfs_parsed_mount_data *data;
2295 struct super_block *s;
2296 struct nfs_server *server;
2297 struct nfs_fh *mntfh;
2298 struct dentry *mntroot;
2299 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2300 struct nfs_sb_mountdata sb_mntdata = {
2303 int error = -ENOMEM;
2305 data = kzalloc(sizeof(*data), GFP_KERNEL);
2306 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2307 if (data == NULL || mntfh == NULL)
2310 security_init_mnt_opts(&data->lsm_opts);
2312 /* Validate the mount data */
2313 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2317 /* Get a volume representation */
2318 server = nfs4_create_server(data, mntfh);
2319 if (IS_ERR(server)) {
2320 error = PTR_ERR(server);
2323 sb_mntdata.server = server;
2325 if (server->flags & NFS4_MOUNT_UNSHARED)
2326 compare_super = NULL;
2328 /* Get a superblock - note that we may end up sharing one that already exists */
2329 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2335 if (s->s_fs_info != server) {
2336 nfs_free_server(server);
2339 error = nfs_bdi_register(server);
2341 goto error_splat_super;
2345 /* initial superblock/root creation */
2349 mntroot = nfs4_get_root(s, mntfh);
2350 if (IS_ERR(mntroot)) {
2351 error = PTR_ERR(mntroot);
2352 goto error_splat_super;
2355 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2357 goto error_splat_root;
2359 s->s_flags |= MS_ACTIVE;
2361 mnt->mnt_root = mntroot;
2365 kfree(data->client_address);
2366 kfree(data->nfs_server.export_path);
2367 kfree(data->nfs_server.hostname);
2368 security_free_mnt_opts(&data->lsm_opts);
2375 nfs_free_server(server);
2381 up_write(&s->s_umount);
2382 deactivate_super(s);
2386 static void nfs4_kill_super(struct super_block *sb)
2388 struct nfs_server *server = NFS_SB(sb);
2390 nfs_return_all_delegations(sb);
2391 kill_anon_super(sb);
2393 nfs4_renewd_prepare_shutdown(server);
2394 nfs_free_server(server);
2398 * Clone an NFS4 server record on xdev traversal (FSID-change)
2400 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2401 const char *dev_name, void *raw_data,
2402 struct vfsmount *mnt)
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("--> nfs4_xdev_get_sb()\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 & NFS4_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_super;
2444 /* initial superblock/root creation */
2445 nfs4_clone_super(s, data->sb);
2448 mntroot = nfs4_get_root(s, data->fh);
2449 if (IS_ERR(mntroot)) {
2450 error = PTR_ERR(mntroot);
2451 goto error_splat_super;
2453 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2456 goto error_splat_super;
2459 s->s_flags |= MS_ACTIVE;
2461 mnt->mnt_root = mntroot;
2463 security_sb_clone_mnt_opts(data->sb, s);
2465 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2469 nfs_free_server(server);
2471 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2475 up_write(&s->s_umount);
2476 deactivate_super(s);
2477 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2482 * Create an NFS4 server record on referral traversal
2484 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2485 const char *dev_name, void *raw_data,
2486 struct vfsmount *mnt)
2488 struct nfs_clone_mount *data = raw_data;
2489 struct super_block *s;
2490 struct nfs_server *server;
2491 struct dentry *mntroot;
2492 struct nfs_fh mntfh;
2493 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2494 struct nfs_sb_mountdata sb_mntdata = {
2499 dprintk("--> nfs4_referral_get_sb()\n");
2501 /* create a new volume representation */
2502 server = nfs4_create_referral_server(data, &mntfh);
2503 if (IS_ERR(server)) {
2504 error = PTR_ERR(server);
2505 goto out_err_noserver;
2507 sb_mntdata.server = server;
2509 if (server->flags & NFS4_MOUNT_UNSHARED)
2510 compare_super = NULL;
2512 /* Get a superblock - note that we may end up sharing one that already exists */
2513 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2519 if (s->s_fs_info != server) {
2520 nfs_free_server(server);
2523 error = nfs_bdi_register(server);
2525 goto error_splat_super;
2529 /* initial superblock/root creation */
2533 mntroot = nfs4_get_root(s, &mntfh);
2534 if (IS_ERR(mntroot)) {
2535 error = PTR_ERR(mntroot);
2536 goto error_splat_super;
2538 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2541 goto error_splat_super;
2544 s->s_flags |= MS_ACTIVE;
2546 mnt->mnt_root = mntroot;
2548 security_sb_clone_mnt_opts(data->sb, s);
2550 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2554 nfs_free_server(server);
2556 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2560 up_write(&s->s_umount);
2561 deactivate_super(s);
2562 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2566 #endif /* CONFIG_NFS_V4 */