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 /* Mount options that are ignored */
96 Opt_userspace, Opt_deprecated,
101 static match_table_t nfs_mount_option_tokens = {
102 { Opt_userspace, "bg" },
103 { Opt_userspace, "fg" },
104 { Opt_userspace, "retry=%s" },
106 { Opt_soft, "soft" },
107 { Opt_hard, "hard" },
108 { Opt_deprecated, "intr" },
109 { Opt_deprecated, "nointr" },
110 { Opt_posix, "posix" },
111 { Opt_noposix, "noposix" },
113 { Opt_nocto, "nocto" },
115 { Opt_noac, "noac" },
116 { Opt_lock, "lock" },
117 { Opt_nolock, "nolock" },
122 { Opt_rdma, "rdma" },
124 { Opt_noacl, "noacl" },
125 { Opt_rdirplus, "rdirplus" },
126 { Opt_nordirplus, "nordirplus" },
127 { Opt_sharecache, "sharecache" },
128 { Opt_nosharecache, "nosharecache" },
130 { Opt_port, "port=%u" },
131 { Opt_rsize, "rsize=%u" },
132 { Opt_wsize, "wsize=%u" },
133 { Opt_bsize, "bsize=%u" },
134 { Opt_timeo, "timeo=%u" },
135 { Opt_retrans, "retrans=%u" },
136 { Opt_acregmin, "acregmin=%u" },
137 { Opt_acregmax, "acregmax=%u" },
138 { Opt_acdirmin, "acdirmin=%u" },
139 { Opt_acdirmax, "acdirmax=%u" },
140 { Opt_actimeo, "actimeo=%u" },
141 { Opt_namelen, "namlen=%u" },
142 { Opt_mountport, "mountport=%u" },
143 { Opt_mountvers, "mountvers=%u" },
144 { Opt_nfsvers, "nfsvers=%u" },
145 { Opt_nfsvers, "vers=%u" },
147 { Opt_sec, "sec=%s" },
148 { Opt_proto, "proto=%s" },
149 { Opt_mountproto, "mountproto=%s" },
150 { Opt_addr, "addr=%s" },
151 { Opt_clientaddr, "clientaddr=%s" },
152 { Opt_mounthost, "mounthost=%s" },
153 { Opt_mountaddr, "mountaddr=%s" },
159 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
164 static match_table_t nfs_xprt_protocol_tokens = {
165 { Opt_xprt_udp, "udp" },
166 { Opt_xprt_tcp, "tcp" },
167 { Opt_xprt_rdma, "rdma" },
169 { Opt_xprt_err, NULL }
173 Opt_sec_none, Opt_sec_sys,
174 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
175 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
176 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
181 static match_table_t nfs_secflavor_tokens = {
182 { Opt_sec_none, "none" },
183 { Opt_sec_none, "null" },
184 { Opt_sec_sys, "sys" },
186 { Opt_sec_krb5, "krb5" },
187 { Opt_sec_krb5i, "krb5i" },
188 { Opt_sec_krb5p, "krb5p" },
190 { Opt_sec_lkey, "lkey" },
191 { Opt_sec_lkeyi, "lkeyi" },
192 { Opt_sec_lkeyp, "lkeyp" },
194 { Opt_sec_spkm, "spkm3" },
195 { Opt_sec_spkmi, "spkm3i" },
196 { Opt_sec_spkmp, "spkm3p" },
198 { Opt_sec_err, NULL }
202 static void nfs_umount_begin(struct super_block *);
203 static int nfs_statfs(struct dentry *, struct kstatfs *);
204 static int nfs_show_options(struct seq_file *, struct vfsmount *);
205 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
206 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
207 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
208 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
209 static void nfs_kill_super(struct super_block *);
210 static void nfs_put_super(struct super_block *);
211 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
213 static struct file_system_type nfs_fs_type = {
214 .owner = THIS_MODULE,
216 .get_sb = nfs_get_sb,
217 .kill_sb = nfs_kill_super,
218 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
221 struct file_system_type nfs_xdev_fs_type = {
222 .owner = THIS_MODULE,
224 .get_sb = nfs_xdev_get_sb,
225 .kill_sb = nfs_kill_super,
226 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
229 static const struct super_operations nfs_sops = {
230 .alloc_inode = nfs_alloc_inode,
231 .destroy_inode = nfs_destroy_inode,
232 .write_inode = nfs_write_inode,
233 .put_super = nfs_put_super,
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 nfs_server *server)
340 atomic_inc(&server->active);
343 void nfs_sb_deactive(struct nfs_server *server)
345 if (atomic_dec_and_test(&server->active))
346 wake_up(&server->active_wq);
349 static void nfs_put_super(struct super_block *sb)
351 struct nfs_server *server = NFS_SB(sb);
353 * Make sure there are no outstanding ops to this server.
354 * If so, wait for them to finish before allowing the
355 * unmount to continue.
357 wait_event(server->active_wq, atomic_read(&server->active) == 0);
361 * Deliver file system statistics to userspace
363 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
365 struct nfs_server *server = NFS_SB(dentry->d_sb);
366 unsigned char blockbits;
367 unsigned long blockres;
368 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
369 struct nfs_fattr fattr;
370 struct nfs_fsstat res = {
377 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
380 buf->f_type = NFS_SUPER_MAGIC;
383 * Current versions of glibc do not correctly handle the
384 * case where f_frsize != f_bsize. Eventually we want to
385 * report the value of wtmult in this field.
387 buf->f_frsize = dentry->d_sb->s_blocksize;
390 * On most *nix systems, f_blocks, f_bfree, and f_bavail
391 * are reported in units of f_frsize. Linux hasn't had
392 * an f_frsize field in its statfs struct until recently,
393 * thus historically Linux's sys_statfs reports these
394 * fields in units of f_bsize.
396 buf->f_bsize = dentry->d_sb->s_blocksize;
397 blockbits = dentry->d_sb->s_blocksize_bits;
398 blockres = (1 << blockbits) - 1;
399 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
400 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
401 buf->f_bavail = (res.abytes + blockres) >> blockbits;
403 buf->f_files = res.tfiles;
404 buf->f_ffree = res.afiles;
406 buf->f_namelen = server->namelen;
412 dprintk("%s: statfs error = %d\n", __func__, -error);
418 * Map the security flavour number to a name
420 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
422 static const struct {
423 rpc_authflavor_t flavour;
426 { RPC_AUTH_NULL, "null" },
427 { RPC_AUTH_UNIX, "sys" },
428 { RPC_AUTH_GSS_KRB5, "krb5" },
429 { RPC_AUTH_GSS_KRB5I, "krb5i" },
430 { RPC_AUTH_GSS_KRB5P, "krb5p" },
431 { RPC_AUTH_GSS_LKEY, "lkey" },
432 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
433 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
434 { RPC_AUTH_GSS_SPKM, "spkm" },
435 { RPC_AUTH_GSS_SPKMI, "spkmi" },
436 { RPC_AUTH_GSS_SPKMP, "spkmp" },
437 { UINT_MAX, "unknown" }
441 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
442 if (sec_flavours[i].flavour == flavour)
445 return sec_flavours[i].str;
448 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
451 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
453 switch (sap->sa_family) {
455 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
456 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
457 NIPQUAD(sin->sin_addr.s_addr));
461 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
462 seq_printf(m, ",mountaddr=" NIP6_FMT,
463 NIP6(sin6->sin6_addr));
468 seq_printf(m, ",mountaddr=unspecified");
471 if (nfss->mountd_version || showdefaults)
472 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
473 if (nfss->mountd_port || showdefaults)
474 seq_printf(m, ",mountport=%u", nfss->mountd_port);
476 switch (nfss->mountd_protocol) {
478 seq_printf(m, ",mountproto=udp");
481 seq_printf(m, ",mountproto=tcp");
485 seq_printf(m, ",mountproto=auto");
490 * Describe the mount options in force on this server representation
492 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
495 static const struct proc_nfs_info {
500 { NFS_MOUNT_SOFT, ",soft", ",hard" },
501 { NFS_MOUNT_INTR, ",intr", ",nointr" },
502 { NFS_MOUNT_POSIX, ",posix", "" },
503 { NFS_MOUNT_NOCTO, ",nocto", "" },
504 { NFS_MOUNT_NOAC, ",noac", "" },
505 { NFS_MOUNT_NONLM, ",nolock", "" },
506 { NFS_MOUNT_NOACL, ",noacl", "" },
507 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
508 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
511 const struct proc_nfs_info *nfs_infop;
512 struct nfs_client *clp = nfss->nfs_client;
513 u32 version = clp->rpc_ops->version;
515 seq_printf(m, ",vers=%u", version);
516 seq_printf(m, ",rsize=%u", nfss->rsize);
517 seq_printf(m, ",wsize=%u", nfss->wsize);
518 if (nfss->bsize != 0)
519 seq_printf(m, ",bsize=%u", nfss->bsize);
520 seq_printf(m, ",namlen=%u", nfss->namelen);
521 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
522 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
523 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
524 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
525 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
526 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
527 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
528 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
529 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
530 if (nfss->flags & nfs_infop->flag)
531 seq_puts(m, nfs_infop->str);
533 seq_puts(m, nfs_infop->nostr);
535 seq_printf(m, ",proto=%s",
536 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
538 if (nfss->port != NFS_PORT)
539 seq_printf(m, ",port=%u", nfss->port);
542 seq_printf(m, ",port=%u", nfss->port);
544 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
545 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
546 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
549 nfs_show_mountd_options(m, nfss, showdefaults);
552 if (clp->rpc_ops->version == 4)
553 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
558 * Describe the mount options on this VFS mountpoint
560 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
562 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
564 nfs_show_mount_options(m, nfss, 0);
566 seq_printf(m, ",addr=%s",
567 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
574 * Present statistical information for this VFS mountpoint
576 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
579 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
580 struct rpc_auth *auth = nfss->client->cl_auth;
581 struct nfs_iostats totals = { };
583 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
586 * Display all mount option settings
588 seq_printf(m, "\n\topts:\t");
589 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
590 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
591 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
592 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
593 nfs_show_mount_options(m, nfss, 1);
595 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
597 seq_printf(m, "\n\tcaps:\t");
598 seq_printf(m, "caps=0x%x", nfss->caps);
599 seq_printf(m, ",wtmult=%u", nfss->wtmult);
600 seq_printf(m, ",dtsize=%u", nfss->dtsize);
601 seq_printf(m, ",bsize=%u", nfss->bsize);
602 seq_printf(m, ",namlen=%u", nfss->namelen);
605 if (nfss->nfs_client->rpc_ops->version == 4) {
606 seq_printf(m, "\n\tnfsv4:\t");
607 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
608 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
609 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
614 * Display security flavor in effect for this mount
616 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
618 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
621 * Display superblock I/O counters
623 for_each_possible_cpu(cpu) {
624 struct nfs_iostats *stats;
627 stats = per_cpu_ptr(nfss->io_stats, cpu);
629 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
630 totals.events[i] += stats->events[i];
631 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
632 totals.bytes[i] += stats->bytes[i];
637 seq_printf(m, "\n\tevents:\t");
638 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
639 seq_printf(m, "%lu ", totals.events[i]);
640 seq_printf(m, "\n\tbytes:\t");
641 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
642 seq_printf(m, "%Lu ", totals.bytes[i]);
645 rpc_print_iostats(m, nfss->client);
651 * Begin unmount by attempting to remove all automounted mountpoints we added
652 * in response to xdev traversals and referrals
654 static void nfs_umount_begin(struct super_block *sb)
656 struct nfs_server *server = NFS_SB(sb);
657 struct rpc_clnt *rpc;
659 /* -EIO all pending I/O */
660 rpc = server->client_acl;
662 rpc_killall_tasks(rpc);
663 rpc = server->client;
665 rpc_killall_tasks(rpc);
669 * Set the port number in an address. Be agnostic about the address family.
671 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
673 switch (sap->sa_family) {
675 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
676 ap->sin_port = htons(port);
680 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
681 ap->sin6_port = htons(port);
688 * Sanity-check a server address provided by the mount command.
690 * Address family must be initialized, and address must not be
691 * the ANY address for that family.
693 static int nfs_verify_server_address(struct sockaddr *addr)
695 switch (addr->sa_family) {
697 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
698 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
701 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
702 return !ipv6_addr_any(sa);
709 static void nfs_parse_ipv4_address(char *string, size_t str_len,
710 struct sockaddr *sap, size_t *addr_len)
712 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
713 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
715 if (str_len <= INET_ADDRSTRLEN) {
716 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
717 (int)str_len, string);
719 sin->sin_family = AF_INET;
720 *addr_len = sizeof(*sin);
721 if (in4_pton(string, str_len, addr, '\0', NULL))
725 sap->sa_family = AF_UNSPEC;
729 #define IPV6_SCOPE_DELIMITER '%'
731 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
732 static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
734 struct sockaddr_in6 *sin6)
739 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
741 if (*delim != IPV6_SCOPE_DELIMITER)
744 len = (string + str_len) - delim - 1;
745 p = kstrndup(delim + 1, len, GFP_KERNEL);
747 unsigned long scope_id = 0;
748 struct net_device *dev;
750 dev = dev_get_by_name(&init_net, p);
752 scope_id = dev->ifindex;
755 /* scope_id is set to zero on error */
756 strict_strtoul(p, 10, &scope_id);
760 sin6->sin6_scope_id = scope_id;
761 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
765 static void nfs_parse_ipv6_address(char *string, size_t str_len,
766 struct sockaddr *sap, size_t *addr_len)
768 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
769 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
772 if (str_len <= INET6_ADDRSTRLEN) {
773 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
774 (int)str_len, string);
776 sin6->sin6_family = AF_INET6;
777 *addr_len = sizeof(*sin6);
778 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
779 nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
784 sap->sa_family = AF_UNSPEC;
788 static void nfs_parse_ipv6_address(char *string, size_t str_len,
789 struct sockaddr *sap, size_t *addr_len)
791 sap->sa_family = AF_UNSPEC;
797 * Construct a sockaddr based on the contents of a string that contains
798 * an IP address in presentation format.
800 * If there is a problem constructing the new sockaddr, set the address
801 * family to AF_UNSPEC.
803 static void nfs_parse_ip_address(char *string, size_t str_len,
804 struct sockaddr *sap, size_t *addr_len)
806 unsigned int i, colons;
809 for (i = 0; i < str_len; i++)
810 if (string[i] == ':')
814 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
816 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
820 * Sanity check the NFS transport protocol.
823 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
825 switch (mnt->nfs_server.protocol) {
826 case XPRT_TRANSPORT_UDP:
827 case XPRT_TRANSPORT_TCP:
828 case XPRT_TRANSPORT_RDMA:
831 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
836 * For text based NFSv2/v3 mounts, the mount protocol transport default
837 * settings should depend upon the specified NFS transport.
839 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
841 nfs_validate_transport_protocol(mnt);
843 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
844 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
846 switch (mnt->nfs_server.protocol) {
847 case XPRT_TRANSPORT_UDP:
848 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
850 case XPRT_TRANSPORT_TCP:
851 case XPRT_TRANSPORT_RDMA:
852 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
857 * Parse the value of the 'sec=' option.
859 * The flags setting is for v2/v3. The flavor_len setting is for v4.
860 * v2/v3 also need to know the difference between NULL and UNIX.
862 static int nfs_parse_security_flavors(char *value,
863 struct nfs_parsed_mount_data *mnt)
865 substring_t args[MAX_OPT_ARGS];
867 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
869 switch (match_token(value, nfs_secflavor_tokens, args)) {
871 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
872 mnt->auth_flavor_len = 0;
873 mnt->auth_flavors[0] = RPC_AUTH_NULL;
876 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
877 mnt->auth_flavor_len = 0;
878 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
881 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
882 mnt->auth_flavor_len = 1;
883 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
886 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
887 mnt->auth_flavor_len = 1;
888 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
891 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
892 mnt->auth_flavor_len = 1;
893 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
896 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
897 mnt->auth_flavor_len = 1;
898 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
901 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
902 mnt->auth_flavor_len = 1;
903 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
906 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
907 mnt->auth_flavor_len = 1;
908 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
911 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
912 mnt->auth_flavor_len = 1;
913 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
916 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
917 mnt->auth_flavor_len = 1;
918 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
921 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
922 mnt->auth_flavor_len = 1;
923 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
933 * Error-check and convert a string of mount options from user space into
936 static int nfs_parse_mount_options(char *raw,
937 struct nfs_parsed_mount_data *mnt)
939 char *p, *string, *secdata;
943 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
946 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
948 secdata = alloc_secdata();
952 rc = security_sb_copy_data(raw, secdata);
954 goto out_security_failure;
956 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
958 goto out_security_failure;
960 free_secdata(secdata);
962 while ((p = strsep(&raw, ",")) != NULL) {
963 substring_t args[MAX_OPT_ARGS];
969 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
971 token = match_token(p, nfs_mount_option_tokens, args);
974 mnt->flags |= NFS_MOUNT_SOFT;
977 mnt->flags &= ~NFS_MOUNT_SOFT;
980 mnt->flags |= NFS_MOUNT_POSIX;
983 mnt->flags &= ~NFS_MOUNT_POSIX;
986 mnt->flags &= ~NFS_MOUNT_NOCTO;
989 mnt->flags |= NFS_MOUNT_NOCTO;
992 mnt->flags &= ~NFS_MOUNT_NOAC;
995 mnt->flags |= NFS_MOUNT_NOAC;
998 mnt->flags &= ~NFS_MOUNT_NONLM;
1001 mnt->flags |= NFS_MOUNT_NONLM;
1004 mnt->flags &= ~NFS_MOUNT_VER3;
1007 mnt->flags |= NFS_MOUNT_VER3;
1010 mnt->flags &= ~NFS_MOUNT_TCP;
1011 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1014 mnt->flags |= NFS_MOUNT_TCP;
1015 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1018 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1019 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1022 mnt->flags &= ~NFS_MOUNT_NOACL;
1025 mnt->flags |= NFS_MOUNT_NOACL;
1028 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1030 case Opt_nordirplus:
1031 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1033 case Opt_sharecache:
1034 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1036 case Opt_nosharecache:
1037 mnt->flags |= NFS_MOUNT_UNSHARED;
1041 if (match_int(args, &option))
1043 if (option < 0 || option > 65535)
1045 mnt->nfs_server.port = option;
1048 if (match_int(args, &mnt->rsize))
1052 if (match_int(args, &mnt->wsize))
1056 if (match_int(args, &option))
1060 mnt->bsize = option;
1063 if (match_int(args, &mnt->timeo))
1067 if (match_int(args, &mnt->retrans))
1071 if (match_int(args, &mnt->acregmin))
1075 if (match_int(args, &mnt->acregmax))
1079 if (match_int(args, &mnt->acdirmin))
1083 if (match_int(args, &mnt->acdirmax))
1087 if (match_int(args, &option))
1094 mnt->acdirmax = option;
1097 if (match_int(args, &mnt->namlen))
1101 if (match_int(args, &option))
1103 if (option < 0 || option > 65535)
1105 mnt->mount_server.port = option;
1108 if (match_int(args, &option))
1112 mnt->mount_server.version = option;
1115 if (match_int(args, &option))
1119 mnt->flags &= ~NFS_MOUNT_VER3;
1122 mnt->flags |= NFS_MOUNT_VER3;
1125 goto out_unrec_vers;
1130 string = match_strdup(args);
1133 rc = nfs_parse_security_flavors(string, mnt);
1139 string = match_strdup(args);
1142 token = match_token(string,
1143 nfs_xprt_protocol_tokens, args);
1148 mnt->flags &= ~NFS_MOUNT_TCP;
1149 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1152 mnt->flags |= NFS_MOUNT_TCP;
1153 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1156 /* vector side protocols to TCP */
1157 mnt->flags |= NFS_MOUNT_TCP;
1158 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1161 goto out_unrec_xprt;
1164 case Opt_mountproto:
1165 string = match_strdup(args);
1168 token = match_token(string,
1169 nfs_xprt_protocol_tokens, args);
1174 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1177 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1179 case Opt_xprt_rdma: /* not used for side protocols */
1181 goto out_unrec_xprt;
1185 string = match_strdup(args);
1188 nfs_parse_ip_address(string, strlen(string),
1190 &mnt->nfs_server.address,
1191 &mnt->nfs_server.addrlen);
1194 case Opt_clientaddr:
1195 string = match_strdup(args);
1198 kfree(mnt->client_address);
1199 mnt->client_address = string;
1202 string = match_strdup(args);
1205 kfree(mnt->mount_server.hostname);
1206 mnt->mount_server.hostname = string;
1209 string = match_strdup(args);
1212 nfs_parse_ip_address(string, strlen(string),
1214 &mnt->mount_server.address,
1215 &mnt->mount_server.addrlen);
1220 case Opt_deprecated:
1221 dfprintk(MOUNT, "NFS: ignoring mount option "
1233 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1235 out_security_failure:
1236 free_secdata(secdata);
1237 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1240 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1244 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1248 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1252 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1257 * Use the remote server's MOUNT service to request the NFS file handle
1258 * corresponding to the provided path.
1260 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1261 struct nfs_fh *root_fh)
1263 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1267 if (args->mount_server.version == 0) {
1268 if (args->flags & NFS_MOUNT_VER3)
1269 args->mount_server.version = NFS_MNT3_VERSION;
1271 args->mount_server.version = NFS_MNT_VERSION;
1274 if (args->mount_server.hostname)
1275 hostname = args->mount_server.hostname;
1277 hostname = args->nfs_server.hostname;
1280 * Construct the mount server's address.
1282 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1283 memcpy(sap, &args->nfs_server.address,
1284 args->nfs_server.addrlen);
1285 args->mount_server.addrlen = args->nfs_server.addrlen;
1289 * autobind will be used if mount_server.port == 0
1291 nfs_set_port(sap, args->mount_server.port);
1294 * Now ask the mount server to map our export path
1297 status = nfs_mount(sap,
1298 args->mount_server.addrlen,
1300 args->nfs_server.export_path,
1301 args->mount_server.version,
1302 args->mount_server.protocol,
1307 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1312 static int nfs_parse_simple_hostname(const char *dev_name,
1313 char **hostname, size_t maxnamlen,
1314 char **export_path, size_t maxpathlen)
1317 char *colon, *comma;
1319 colon = strchr(dev_name, ':');
1321 goto out_bad_devname;
1323 len = colon - dev_name;
1324 if (len > maxnamlen)
1327 /* N.B. caller will free nfs_server.hostname in all cases */
1328 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1332 /* kill possible hostname list: not supported */
1333 comma = strchr(*hostname, ',');
1334 if (comma != NULL) {
1335 if (comma == *hostname)
1336 goto out_bad_devname;
1341 len = strlen(colon);
1342 if (len > maxpathlen)
1344 *export_path = kstrndup(colon, len, GFP_KERNEL);
1348 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1352 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1356 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1360 dfprintk(MOUNT, "NFS: server hostname too long\n");
1361 return -ENAMETOOLONG;
1364 dfprintk(MOUNT, "NFS: export pathname too long\n");
1365 return -ENAMETOOLONG;
1369 * Hostname has square brackets around it because it contains one or
1370 * more colons. We look for the first closing square bracket, and a
1371 * colon must follow it.
1373 static int nfs_parse_protected_hostname(const char *dev_name,
1374 char **hostname, size_t maxnamlen,
1375 char **export_path, size_t maxpathlen)
1380 start = (char *)(dev_name + 1);
1382 end = strchr(start, ']');
1384 goto out_bad_devname;
1385 if (*(end + 1) != ':')
1386 goto out_bad_devname;
1389 if (len > maxnamlen)
1392 /* N.B. caller will free nfs_server.hostname in all cases */
1393 *hostname = kstrndup(start, len, GFP_KERNEL);
1394 if (*hostname == NULL)
1399 if (len > maxpathlen)
1401 *export_path = kstrndup(end, len, GFP_KERNEL);
1408 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1412 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1416 dfprintk(MOUNT, "NFS: server hostname too long\n");
1417 return -ENAMETOOLONG;
1420 dfprintk(MOUNT, "NFS: export pathname too long\n");
1421 return -ENAMETOOLONG;
1425 * Split "dev_name" into "hostname:export_path".
1427 * The leftmost colon demarks the split between the server's hostname
1428 * and the export path. If the hostname starts with a left square
1429 * bracket, then it may contain colons.
1431 * Note: caller frees hostname and export path, even on error.
1433 static int nfs_parse_devname(const char *dev_name,
1434 char **hostname, size_t maxnamlen,
1435 char **export_path, size_t maxpathlen)
1437 if (*dev_name == '[')
1438 return nfs_parse_protected_hostname(dev_name,
1439 hostname, maxnamlen,
1440 export_path, maxpathlen);
1442 return nfs_parse_simple_hostname(dev_name,
1443 hostname, maxnamlen,
1444 export_path, maxpathlen);
1448 * Validate the NFS2/NFS3 mount data
1449 * - fills in the mount root filehandle
1451 * For option strings, user space handles the following behaviors:
1453 * + DNS: mapping server host name to IP address ("addr=" option)
1455 * + failure mode: how to behave if a mount request can't be handled
1456 * immediately ("fg/bg" option)
1458 * + retry: how often to retry a mount request ("retry=" option)
1460 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1461 * mountproto=tcp after mountproto=udp, and so on
1463 static int nfs_validate_mount_data(void *options,
1464 struct nfs_parsed_mount_data *args,
1465 struct nfs_fh *mntfh,
1466 const char *dev_name)
1468 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1473 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1474 args->rsize = NFS_MAX_FILE_IO_SIZE;
1475 args->wsize = NFS_MAX_FILE_IO_SIZE;
1476 args->acregmin = NFS_DEF_ACREGMIN;
1477 args->acregmax = NFS_DEF_ACREGMAX;
1478 args->acdirmin = NFS_DEF_ACDIRMIN;
1479 args->acdirmax = NFS_DEF_ACDIRMAX;
1480 args->mount_server.port = 0; /* autobind unless user sets port */
1481 args->nfs_server.port = 0; /* autobind unless user sets port */
1482 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1484 switch (data->version) {
1490 if (data->flags & NFS_MOUNT_VER3)
1492 data->root.size = NFS2_FHSIZE;
1493 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1495 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1498 memset(data->context, 0, sizeof(data->context));
1500 if (data->flags & NFS_MOUNT_VER3) {
1501 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1502 goto out_invalid_fh;
1503 mntfh->size = data->root.size;
1505 mntfh->size = NFS2_FHSIZE;
1508 memcpy(mntfh->data, data->root.data, mntfh->size);
1509 if (mntfh->size < sizeof(mntfh->data))
1510 memset(mntfh->data + mntfh->size, 0,
1511 sizeof(mntfh->data) - mntfh->size);
1514 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1517 args->flags = data->flags;
1518 args->rsize = data->rsize;
1519 args->wsize = data->wsize;
1520 args->timeo = data->timeo;
1521 args->retrans = data->retrans;
1522 args->acregmin = data->acregmin;
1523 args->acregmax = data->acregmax;
1524 args->acdirmin = data->acdirmin;
1525 args->acdirmax = data->acdirmax;
1527 memcpy(&args->nfs_server.address, &data->addr,
1528 sizeof(data->addr));
1529 args->nfs_server.addrlen = sizeof(data->addr);
1530 if (!nfs_verify_server_address((struct sockaddr *)
1531 &args->nfs_server.address))
1532 goto out_no_address;
1534 if (!(data->flags & NFS_MOUNT_TCP))
1535 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1536 /* N.B. caller will free nfs_server.hostname in all cases */
1537 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1538 args->namlen = data->namlen;
1539 args->bsize = data->bsize;
1540 args->auth_flavors[0] = data->pseudoflavor;
1541 if (!args->nfs_server.hostname)
1545 * The legacy version 6 binary mount data from userspace has a
1546 * field used only to transport selinux information into the
1547 * the kernel. To continue to support that functionality we
1548 * have a touch of selinux knowledge here in the NFS code. The
1549 * userspace code converted context=blah to just blah so we are
1550 * converting back to the full string selinux understands.
1552 if (data->context[0]){
1553 #ifdef CONFIG_SECURITY_SELINUX
1555 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1558 strcpy(opts_str, "context=");
1559 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1560 strcat(opts_str, &data->context[0]);
1561 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1574 if (nfs_parse_mount_options((char *)options, args) == 0)
1577 if (!nfs_verify_server_address((struct sockaddr *)
1578 &args->nfs_server.address))
1579 goto out_no_address;
1581 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1582 args->nfs_server.port);
1584 nfs_set_mount_transport_protocol(args);
1586 status = nfs_parse_devname(dev_name,
1587 &args->nfs_server.hostname,
1589 &args->nfs_server.export_path,
1592 status = nfs_try_mount(args, mntfh);
1594 kfree(args->nfs_server.export_path);
1595 args->nfs_server.export_path = NULL;
1604 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1605 args->auth_flavors[0] = RPC_AUTH_UNIX;
1607 #ifndef CONFIG_NFS_V3
1608 if (args->flags & NFS_MOUNT_VER3)
1609 goto out_v3_not_compiled;
1610 #endif /* !CONFIG_NFS_V3 */
1615 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1619 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1624 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1627 #ifndef CONFIG_NFS_V3
1628 out_v3_not_compiled:
1629 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1630 return -EPROTONOSUPPORT;
1631 #endif /* !CONFIG_NFS_V3 */
1634 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1638 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1642 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1647 nfs_compare_remount_data(struct nfs_server *nfss,
1648 struct nfs_parsed_mount_data *data)
1650 if (data->flags != nfss->flags ||
1651 data->rsize != nfss->rsize ||
1652 data->wsize != nfss->wsize ||
1653 data->retrans != nfss->client->cl_timeout->to_retries ||
1654 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1655 data->acregmin != nfss->acregmin / HZ ||
1656 data->acregmax != nfss->acregmax / HZ ||
1657 data->acdirmin != nfss->acdirmin / HZ ||
1658 data->acdirmax != nfss->acdirmax / HZ ||
1659 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1660 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1661 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1662 data->nfs_server.addrlen) != 0)
1669 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1672 struct nfs_server *nfss = sb->s_fs_info;
1673 struct nfs_parsed_mount_data *data;
1674 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1675 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1676 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1679 * Userspace mount programs that send binary options generally send
1680 * them populated with default values. We have no way to know which
1681 * ones were explicitly specified. Fall back to legacy behavior and
1682 * just return success.
1684 if ((nfsvers == 4 && options4->version == 1) ||
1685 (nfsvers <= 3 && options->version >= 1 &&
1686 options->version <= 6))
1689 data = kzalloc(sizeof(*data), GFP_KERNEL);
1693 /* fill out struct with values from existing mount */
1694 data->flags = nfss->flags;
1695 data->rsize = nfss->rsize;
1696 data->wsize = nfss->wsize;
1697 data->retrans = nfss->client->cl_timeout->to_retries;
1698 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1699 data->acregmin = nfss->acregmin / HZ;
1700 data->acregmax = nfss->acregmax / HZ;
1701 data->acdirmin = nfss->acdirmin / HZ;
1702 data->acdirmax = nfss->acdirmax / HZ;
1703 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1704 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1705 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1706 data->nfs_server.addrlen);
1708 /* overwrite those values with any that were specified */
1709 error = nfs_parse_mount_options((char *)options, data);
1713 /* compare new mount options with old ones */
1714 error = nfs_compare_remount_data(nfss, data);
1721 * Initialise the common bits of the superblock
1723 static inline void nfs_initialise_sb(struct super_block *sb)
1725 struct nfs_server *server = NFS_SB(sb);
1727 sb->s_magic = NFS_SUPER_MAGIC;
1729 /* We probably want something more informative here */
1730 snprintf(sb->s_id, sizeof(sb->s_id),
1731 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1733 if (sb->s_blocksize == 0)
1734 sb->s_blocksize = nfs_block_bits(server->wsize,
1735 &sb->s_blocksize_bits);
1737 if (server->flags & NFS_MOUNT_NOAC)
1738 sb->s_flags |= MS_SYNCHRONOUS;
1740 nfs_super_set_maxbytes(sb, server->maxfilesize);
1744 * Finish setting up an NFS2/3 superblock
1746 static void nfs_fill_super(struct super_block *sb,
1747 struct nfs_parsed_mount_data *data)
1749 struct nfs_server *server = NFS_SB(sb);
1751 sb->s_blocksize_bits = 0;
1752 sb->s_blocksize = 0;
1754 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1756 if (server->flags & NFS_MOUNT_VER3) {
1757 /* The VFS shouldn't apply the umask to mode bits. We will do
1758 * so ourselves when necessary.
1760 sb->s_flags |= MS_POSIXACL;
1761 sb->s_time_gran = 1;
1764 sb->s_op = &nfs_sops;
1765 nfs_initialise_sb(sb);
1769 * Finish setting up a cloned NFS2/3 superblock
1771 static void nfs_clone_super(struct super_block *sb,
1772 const struct super_block *old_sb)
1774 struct nfs_server *server = NFS_SB(sb);
1776 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1777 sb->s_blocksize = old_sb->s_blocksize;
1778 sb->s_maxbytes = old_sb->s_maxbytes;
1780 if (server->flags & NFS_MOUNT_VER3) {
1781 /* The VFS shouldn't apply the umask to mode bits. We will do
1782 * so ourselves when necessary.
1784 sb->s_flags |= MS_POSIXACL;
1785 sb->s_time_gran = 1;
1788 sb->s_op = old_sb->s_op;
1789 nfs_initialise_sb(sb);
1792 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1794 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1796 const struct nfs_server *a = s->s_fs_info;
1797 const struct rpc_clnt *clnt_a = a->client;
1798 const struct rpc_clnt *clnt_b = b->client;
1800 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1802 if (a->nfs_client != b->nfs_client)
1804 if (a->flags != b->flags)
1806 if (a->wsize != b->wsize)
1808 if (a->rsize != b->rsize)
1810 if (a->acregmin != b->acregmin)
1812 if (a->acregmax != b->acregmax)
1814 if (a->acdirmin != b->acdirmin)
1816 if (a->acdirmax != b->acdirmax)
1818 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1825 struct nfs_sb_mountdata {
1826 struct nfs_server *server;
1830 static int nfs_set_super(struct super_block *s, void *data)
1832 struct nfs_sb_mountdata *sb_mntdata = data;
1833 struct nfs_server *server = sb_mntdata->server;
1836 s->s_flags = sb_mntdata->mntflags;
1837 s->s_fs_info = server;
1838 ret = set_anon_super(s, server);
1840 server->s_dev = s->s_dev;
1844 static int nfs_compare_super_address(struct nfs_server *server1,
1845 struct nfs_server *server2)
1847 struct sockaddr *sap1, *sap2;
1849 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1850 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1852 if (sap1->sa_family != sap2->sa_family)
1855 switch (sap1->sa_family) {
1857 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1858 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1859 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1861 if (sin1->sin_port != sin2->sin_port)
1866 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1867 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1868 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1870 if (sin1->sin6_port != sin2->sin6_port)
1881 static int nfs_compare_super(struct super_block *sb, void *data)
1883 struct nfs_sb_mountdata *sb_mntdata = data;
1884 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1885 int mntflags = sb_mntdata->mntflags;
1887 if (!nfs_compare_super_address(old, server))
1889 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1890 if (old->flags & NFS_MOUNT_UNSHARED)
1892 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1894 return nfs_compare_mount_options(sb, server, mntflags);
1897 static int nfs_bdi_register(struct nfs_server *server)
1899 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1902 static int nfs_get_sb(struct file_system_type *fs_type,
1903 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1905 struct nfs_server *server = NULL;
1906 struct super_block *s;
1907 struct nfs_parsed_mount_data *data;
1908 struct nfs_fh *mntfh;
1909 struct dentry *mntroot;
1910 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1911 struct nfs_sb_mountdata sb_mntdata = {
1914 int error = -ENOMEM;
1916 data = kzalloc(sizeof(*data), GFP_KERNEL);
1917 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1918 if (data == NULL || mntfh == NULL)
1921 security_init_mnt_opts(&data->lsm_opts);
1923 /* Validate the mount data */
1924 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1928 /* Get a volume representation */
1929 server = nfs_create_server(data, mntfh);
1930 if (IS_ERR(server)) {
1931 error = PTR_ERR(server);
1934 sb_mntdata.server = server;
1936 if (server->flags & NFS_MOUNT_UNSHARED)
1937 compare_super = NULL;
1939 /* Get a superblock - note that we may end up sharing one that already exists */
1940 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1946 if (s->s_fs_info != server) {
1947 nfs_free_server(server);
1950 error = nfs_bdi_register(server);
1952 goto error_splat_super;
1956 /* initial superblock/root creation */
1957 nfs_fill_super(s, data);
1960 mntroot = nfs_get_root(s, mntfh);
1961 if (IS_ERR(mntroot)) {
1962 error = PTR_ERR(mntroot);
1963 goto error_splat_super;
1966 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1968 goto error_splat_root;
1970 s->s_flags |= MS_ACTIVE;
1972 mnt->mnt_root = mntroot;
1976 kfree(data->nfs_server.hostname);
1977 kfree(data->mount_server.hostname);
1978 security_free_mnt_opts(&data->lsm_opts);
1985 nfs_free_server(server);
1991 up_write(&s->s_umount);
1992 deactivate_super(s);
1997 * Destroy an NFS2/3 superblock
1999 static void nfs_kill_super(struct super_block *s)
2001 struct nfs_server *server = NFS_SB(s);
2003 bdi_unregister(&server->backing_dev_info);
2005 nfs_free_server(server);
2009 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2011 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2012 const char *dev_name, void *raw_data,
2013 struct vfsmount *mnt)
2015 struct nfs_clone_mount *data = raw_data;
2016 struct super_block *s;
2017 struct nfs_server *server;
2018 struct dentry *mntroot;
2019 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2020 struct nfs_sb_mountdata sb_mntdata = {
2025 dprintk("--> nfs_xdev_get_sb()\n");
2027 /* create a new volume representation */
2028 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2029 if (IS_ERR(server)) {
2030 error = PTR_ERR(server);
2031 goto out_err_noserver;
2033 sb_mntdata.server = server;
2035 if (server->flags & NFS_MOUNT_UNSHARED)
2036 compare_super = NULL;
2038 /* Get a superblock - note that we may end up sharing one that already exists */
2039 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2045 if (s->s_fs_info != server) {
2046 nfs_free_server(server);
2049 error = nfs_bdi_register(server);
2051 goto error_splat_super;
2055 /* initial superblock/root creation */
2056 nfs_clone_super(s, data->sb);
2059 mntroot = nfs_get_root(s, data->fh);
2060 if (IS_ERR(mntroot)) {
2061 error = PTR_ERR(mntroot);
2062 goto error_splat_super;
2064 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2067 goto error_splat_super;
2070 s->s_flags |= MS_ACTIVE;
2072 mnt->mnt_root = mntroot;
2074 /* clone any lsm security options from the parent to the new sb */
2075 security_sb_clone_mnt_opts(data->sb, s);
2077 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2081 nfs_free_server(server);
2083 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2087 up_write(&s->s_umount);
2088 deactivate_super(s);
2089 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2093 #ifdef CONFIG_NFS_V4
2096 * Finish setting up a cloned NFS4 superblock
2098 static void nfs4_clone_super(struct super_block *sb,
2099 const struct super_block *old_sb)
2101 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2102 sb->s_blocksize = old_sb->s_blocksize;
2103 sb->s_maxbytes = old_sb->s_maxbytes;
2104 sb->s_time_gran = 1;
2105 sb->s_op = old_sb->s_op;
2106 nfs_initialise_sb(sb);
2110 * Set up an NFS4 superblock
2112 static void nfs4_fill_super(struct super_block *sb)
2114 sb->s_time_gran = 1;
2115 sb->s_op = &nfs4_sops;
2116 nfs_initialise_sb(sb);
2120 * Validate NFSv4 mount options
2122 static int nfs4_validate_mount_data(void *options,
2123 struct nfs_parsed_mount_data *args,
2124 const char *dev_name)
2126 struct sockaddr_in *ap;
2127 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2133 args->rsize = NFS_MAX_FILE_IO_SIZE;
2134 args->wsize = NFS_MAX_FILE_IO_SIZE;
2135 args->acregmin = NFS_DEF_ACREGMIN;
2136 args->acregmax = NFS_DEF_ACREGMAX;
2137 args->acdirmin = NFS_DEF_ACDIRMIN;
2138 args->acdirmax = NFS_DEF_ACDIRMAX;
2139 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2141 switch (data->version) {
2143 ap = (struct sockaddr_in *)&args->nfs_server.address;
2144 if (data->host_addrlen > sizeof(args->nfs_server.address))
2145 goto out_no_address;
2146 if (data->host_addrlen == 0)
2147 goto out_no_address;
2148 args->nfs_server.addrlen = data->host_addrlen;
2149 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2151 if (!nfs_verify_server_address((struct sockaddr *)
2152 &args->nfs_server.address))
2153 goto out_no_address;
2155 switch (data->auth_flavourlen) {
2157 args->auth_flavors[0] = RPC_AUTH_UNIX;
2160 if (copy_from_user(&args->auth_flavors[0],
2161 data->auth_flavours,
2162 sizeof(args->auth_flavors[0])))
2166 goto out_inval_auth;
2169 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2172 args->nfs_server.hostname = c;
2174 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2177 args->nfs_server.export_path = c;
2178 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2180 c = strndup_user(data->client_addr.data, 16);
2183 args->client_address = c;
2186 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2190 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2191 args->rsize = data->rsize;
2192 args->wsize = data->wsize;
2193 args->timeo = data->timeo;
2194 args->retrans = data->retrans;
2195 args->acregmin = data->acregmin;
2196 args->acregmax = data->acregmax;
2197 args->acdirmin = data->acdirmin;
2198 args->acdirmax = data->acdirmax;
2199 args->nfs_server.protocol = data->proto;
2200 nfs_validate_transport_protocol(args);
2206 if (nfs_parse_mount_options((char *)options, args) == 0)
2209 if (!nfs_verify_server_address((struct sockaddr *)
2210 &args->nfs_server.address))
2213 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2214 args->nfs_server.port);
2216 nfs_validate_transport_protocol(args);
2218 switch (args->auth_flavor_len) {
2220 args->auth_flavors[0] = RPC_AUTH_UNIX;
2225 goto out_inval_auth;
2228 if (args->client_address == NULL)
2229 goto out_no_client_address;
2231 status = nfs_parse_devname(dev_name,
2232 &args->nfs_server.hostname,
2234 &args->nfs_server.export_path,
2246 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2250 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2251 data->auth_flavourlen);
2255 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2258 out_no_client_address:
2259 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2264 * Get the superblock for an NFS4 mountpoint
2266 static int nfs4_get_sb(struct file_system_type *fs_type,
2267 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2269 struct nfs_parsed_mount_data *data;
2270 struct super_block *s;
2271 struct nfs_server *server;
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 = kzalloc(sizeof(*data), GFP_KERNEL);
2281 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2282 if (data == NULL || mntfh == NULL)
2285 security_init_mnt_opts(&data->lsm_opts);
2287 /* Validate the mount data */
2288 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2292 /* Get a volume representation */
2293 server = nfs4_create_server(data, mntfh);
2294 if (IS_ERR(server)) {
2295 error = PTR_ERR(server);
2298 sb_mntdata.server = server;
2300 if (server->flags & NFS4_MOUNT_UNSHARED)
2301 compare_super = NULL;
2303 /* Get a superblock - note that we may end up sharing one that already exists */
2304 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2310 if (s->s_fs_info != server) {
2311 nfs_free_server(server);
2314 error = nfs_bdi_register(server);
2316 goto error_splat_super;
2320 /* initial superblock/root creation */
2324 mntroot = nfs4_get_root(s, mntfh);
2325 if (IS_ERR(mntroot)) {
2326 error = PTR_ERR(mntroot);
2327 goto error_splat_super;
2330 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2332 goto error_splat_root;
2334 s->s_flags |= MS_ACTIVE;
2336 mnt->mnt_root = mntroot;
2340 kfree(data->client_address);
2341 kfree(data->nfs_server.export_path);
2342 kfree(data->nfs_server.hostname);
2343 security_free_mnt_opts(&data->lsm_opts);
2350 nfs_free_server(server);
2356 up_write(&s->s_umount);
2357 deactivate_super(s);
2361 static void nfs4_kill_super(struct super_block *sb)
2363 struct nfs_server *server = NFS_SB(sb);
2365 nfs_return_all_delegations(sb);
2366 kill_anon_super(sb);
2368 nfs4_renewd_prepare_shutdown(server);
2369 nfs_free_server(server);
2373 * Clone an NFS4 server record on xdev traversal (FSID-change)
2375 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2376 const char *dev_name, void *raw_data,
2377 struct vfsmount *mnt)
2379 struct nfs_clone_mount *data = raw_data;
2380 struct super_block *s;
2381 struct nfs_server *server;
2382 struct dentry *mntroot;
2383 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2384 struct nfs_sb_mountdata sb_mntdata = {
2389 dprintk("--> nfs4_xdev_get_sb()\n");
2391 /* create a new volume representation */
2392 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2393 if (IS_ERR(server)) {
2394 error = PTR_ERR(server);
2395 goto out_err_noserver;
2397 sb_mntdata.server = server;
2399 if (server->flags & NFS4_MOUNT_UNSHARED)
2400 compare_super = NULL;
2402 /* Get a superblock - note that we may end up sharing one that already exists */
2403 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2409 if (s->s_fs_info != server) {
2410 nfs_free_server(server);
2413 error = nfs_bdi_register(server);
2415 goto error_splat_super;
2419 /* initial superblock/root creation */
2420 nfs4_clone_super(s, data->sb);
2423 mntroot = nfs4_get_root(s, data->fh);
2424 if (IS_ERR(mntroot)) {
2425 error = PTR_ERR(mntroot);
2426 goto error_splat_super;
2428 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2431 goto error_splat_super;
2434 s->s_flags |= MS_ACTIVE;
2436 mnt->mnt_root = mntroot;
2438 security_sb_clone_mnt_opts(data->sb, s);
2440 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2444 nfs_free_server(server);
2446 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2450 up_write(&s->s_umount);
2451 deactivate_super(s);
2452 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2457 * Create an NFS4 server record on referral traversal
2459 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2460 const char *dev_name, void *raw_data,
2461 struct vfsmount *mnt)
2463 struct nfs_clone_mount *data = raw_data;
2464 struct super_block *s;
2465 struct nfs_server *server;
2466 struct dentry *mntroot;
2467 struct nfs_fh mntfh;
2468 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2469 struct nfs_sb_mountdata sb_mntdata = {
2474 dprintk("--> nfs4_referral_get_sb()\n");
2476 /* create a new volume representation */
2477 server = nfs4_create_referral_server(data, &mntfh);
2478 if (IS_ERR(server)) {
2479 error = PTR_ERR(server);
2480 goto out_err_noserver;
2482 sb_mntdata.server = server;
2484 if (server->flags & NFS4_MOUNT_UNSHARED)
2485 compare_super = NULL;
2487 /* Get a superblock - note that we may end up sharing one that already exists */
2488 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2494 if (s->s_fs_info != server) {
2495 nfs_free_server(server);
2498 error = nfs_bdi_register(server);
2500 goto error_splat_super;
2504 /* initial superblock/root creation */
2508 mntroot = nfs4_get_root(s, &mntfh);
2509 if (IS_ERR(mntroot)) {
2510 error = PTR_ERR(mntroot);
2511 goto error_splat_super;
2513 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2516 goto error_splat_super;
2519 s->s_flags |= MS_ACTIVE;
2521 mnt->mnt_root = mntroot;
2523 security_sb_clone_mnt_opts(data->sb, s);
2525 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2529 nfs_free_server(server);
2531 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2535 up_write(&s->s_umount);
2536 deactivate_super(s);
2537 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2541 #endif /* CONFIG_NFS_V4 */