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/nfs_xdr.h>
51 #include <linux/magic.h>
52 #include <linux/parser.h>
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
59 #include "delegation.h"
63 #define NFSDBG_FACILITY NFSDBG_VFS
66 /* 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_soft, "soft" },
105 { Opt_hard, "hard" },
106 { Opt_intr, "intr" },
107 { Opt_nointr, "nointr" },
108 { Opt_posix, "posix" },
109 { Opt_noposix, "noposix" },
111 { Opt_nocto, "nocto" },
113 { Opt_noac, "noac" },
114 { Opt_lock, "lock" },
115 { Opt_nolock, "nolock" },
120 { Opt_rdma, "rdma" },
122 { Opt_noacl, "noacl" },
123 { Opt_rdirplus, "rdirplus" },
124 { Opt_nordirplus, "nordirplus" },
125 { Opt_sharecache, "sharecache" },
126 { Opt_nosharecache, "nosharecache" },
128 { Opt_port, "port=%u" },
129 { Opt_rsize, "rsize=%u" },
130 { Opt_wsize, "wsize=%u" },
131 { Opt_bsize, "bsize=%u" },
132 { Opt_timeo, "timeo=%u" },
133 { Opt_retrans, "retrans=%u" },
134 { Opt_acregmin, "acregmin=%u" },
135 { Opt_acregmax, "acregmax=%u" },
136 { Opt_acdirmin, "acdirmin=%u" },
137 { Opt_acdirmax, "acdirmax=%u" },
138 { Opt_actimeo, "actimeo=%u" },
139 { Opt_userspace, "retry=%u" },
140 { Opt_namelen, "namlen=%u" },
141 { Opt_mountport, "mountport=%u" },
142 { Opt_mountvers, "mountvers=%u" },
143 { Opt_nfsvers, "nfsvers=%u" },
144 { Opt_nfsvers, "vers=%u" },
146 { Opt_sec, "sec=%s" },
147 { Opt_proto, "proto=%s" },
148 { Opt_mountproto, "mountproto=%s" },
149 { Opt_addr, "addr=%s" },
150 { Opt_clientaddr, "clientaddr=%s" },
151 { Opt_mounthost, "mounthost=%s" },
152 { Opt_mountaddr, "mountaddr=%s" },
158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
163 static match_table_t nfs_xprt_protocol_tokens = {
164 { Opt_xprt_udp, "udp" },
165 { Opt_xprt_tcp, "tcp" },
166 { Opt_xprt_rdma, "rdma" },
168 { Opt_xprt_err, NULL }
172 Opt_sec_none, Opt_sec_sys,
173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
180 static match_table_t nfs_secflavor_tokens = {
181 { Opt_sec_none, "none" },
182 { Opt_sec_none, "null" },
183 { Opt_sec_sys, "sys" },
185 { Opt_sec_krb5, "krb5" },
186 { Opt_sec_krb5i, "krb5i" },
187 { Opt_sec_krb5p, "krb5p" },
189 { Opt_sec_lkey, "lkey" },
190 { Opt_sec_lkeyi, "lkeyi" },
191 { Opt_sec_lkeyp, "lkeyp" },
193 { Opt_sec_spkm, "spkm3" },
194 { Opt_sec_spkmi, "spkm3i" },
195 { Opt_sec_spkmp, "spkm3p" },
197 { Opt_sec_err, NULL }
201 static void nfs_umount_begin(struct super_block *);
202 static int nfs_statfs(struct dentry *, struct kstatfs *);
203 static int nfs_show_options(struct seq_file *, struct vfsmount *);
204 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
205 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
206 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
207 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
208 static void nfs_kill_super(struct super_block *);
209 static void nfs_put_super(struct super_block *);
210 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
212 static struct file_system_type nfs_fs_type = {
213 .owner = THIS_MODULE,
215 .get_sb = nfs_get_sb,
216 .kill_sb = nfs_kill_super,
217 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
220 struct file_system_type nfs_xdev_fs_type = {
221 .owner = THIS_MODULE,
223 .get_sb = nfs_xdev_get_sb,
224 .kill_sb = nfs_kill_super,
225 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
228 static const struct super_operations nfs_sops = {
229 .alloc_inode = nfs_alloc_inode,
230 .destroy_inode = nfs_destroy_inode,
231 .write_inode = nfs_write_inode,
232 .put_super = nfs_put_super,
233 .statfs = nfs_statfs,
234 .clear_inode = nfs_clear_inode,
235 .umount_begin = nfs_umount_begin,
236 .show_options = nfs_show_options,
237 .show_stats = nfs_show_stats,
238 .remount_fs = nfs_remount,
242 static int nfs4_get_sb(struct file_system_type *fs_type,
243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
246 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
247 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
248 static void nfs4_kill_super(struct super_block *sb);
250 static struct file_system_type nfs4_fs_type = {
251 .owner = THIS_MODULE,
253 .get_sb = nfs4_get_sb,
254 .kill_sb = nfs4_kill_super,
255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
258 struct file_system_type nfs4_xdev_fs_type = {
259 .owner = THIS_MODULE,
261 .get_sb = nfs4_xdev_get_sb,
262 .kill_sb = nfs4_kill_super,
263 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
266 struct file_system_type nfs4_referral_fs_type = {
267 .owner = THIS_MODULE,
269 .get_sb = nfs4_referral_get_sb,
270 .kill_sb = nfs4_kill_super,
271 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
274 static const struct super_operations nfs4_sops = {
275 .alloc_inode = nfs_alloc_inode,
276 .destroy_inode = nfs_destroy_inode,
277 .write_inode = nfs_write_inode,
278 .statfs = nfs_statfs,
279 .clear_inode = nfs4_clear_inode,
280 .umount_begin = nfs_umount_begin,
281 .show_options = nfs_show_options,
282 .show_stats = nfs_show_stats,
283 .remount_fs = nfs_remount,
287 static struct shrinker acl_shrinker = {
288 .shrink = nfs_access_cache_shrinker,
289 .seeks = DEFAULT_SEEKS,
293 * Register the NFS filesystems
295 int __init register_nfs_fs(void)
299 ret = register_filesystem(&nfs_fs_type);
303 ret = nfs_register_sysctl();
307 ret = register_filesystem(&nfs4_fs_type);
311 register_shrinker(&acl_shrinker);
316 nfs_unregister_sysctl();
319 unregister_filesystem(&nfs_fs_type);
325 * Unregister the NFS filesystems
327 void __exit unregister_nfs_fs(void)
329 unregister_shrinker(&acl_shrinker);
331 unregister_filesystem(&nfs4_fs_type);
333 nfs_unregister_sysctl();
334 unregister_filesystem(&nfs_fs_type);
337 void nfs_sb_active(struct nfs_server *server)
339 atomic_inc(&server->active);
342 void nfs_sb_deactive(struct nfs_server *server)
344 if (atomic_dec_and_test(&server->active))
345 wake_up(&server->active_wq);
348 static void nfs_put_super(struct super_block *sb)
350 struct nfs_server *server = NFS_SB(sb);
352 * Make sure there are no outstanding ops to this server.
353 * If so, wait for them to finish before allowing the
354 * unmount to continue.
356 wait_event(server->active_wq, atomic_read(&server->active) == 0);
360 * Deliver file system statistics to userspace
362 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
364 struct nfs_server *server = NFS_SB(dentry->d_sb);
365 unsigned char blockbits;
366 unsigned long blockres;
367 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
368 struct nfs_fattr fattr;
369 struct nfs_fsstat res = {
376 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
379 buf->f_type = NFS_SUPER_MAGIC;
382 * Current versions of glibc do not correctly handle the
383 * case where f_frsize != f_bsize. Eventually we want to
384 * report the value of wtmult in this field.
386 buf->f_frsize = dentry->d_sb->s_blocksize;
389 * On most *nix systems, f_blocks, f_bfree, and f_bavail
390 * are reported in units of f_frsize. Linux hasn't had
391 * an f_frsize field in its statfs struct until recently,
392 * thus historically Linux's sys_statfs reports these
393 * fields in units of f_bsize.
395 buf->f_bsize = dentry->d_sb->s_blocksize;
396 blockbits = dentry->d_sb->s_blocksize_bits;
397 blockres = (1 << blockbits) - 1;
398 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
399 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
400 buf->f_bavail = (res.abytes + blockres) >> blockbits;
402 buf->f_files = res.tfiles;
403 buf->f_ffree = res.afiles;
405 buf->f_namelen = server->namelen;
411 dprintk("%s: statfs error = %d\n", __func__, -error);
417 * Map the security flavour number to a name
419 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
421 static const struct {
422 rpc_authflavor_t flavour;
425 { RPC_AUTH_NULL, "null" },
426 { RPC_AUTH_UNIX, "sys" },
427 { RPC_AUTH_GSS_KRB5, "krb5" },
428 { RPC_AUTH_GSS_KRB5I, "krb5i" },
429 { RPC_AUTH_GSS_KRB5P, "krb5p" },
430 { RPC_AUTH_GSS_LKEY, "lkey" },
431 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
432 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
433 { RPC_AUTH_GSS_SPKM, "spkm" },
434 { RPC_AUTH_GSS_SPKMI, "spkmi" },
435 { RPC_AUTH_GSS_SPKMP, "spkmp" },
436 { UINT_MAX, "unknown" }
440 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
441 if (sec_flavours[i].flavour == flavour)
444 return sec_flavours[i].str;
447 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
450 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
452 switch (sap->sa_family) {
454 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
455 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
456 NIPQUAD(sin->sin_addr.s_addr));
460 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
461 seq_printf(m, ",mountaddr=" NIP6_FMT,
462 NIP6(sin6->sin6_addr));
467 seq_printf(m, ",mountaddr=unspecified");
470 if (nfss->mountd_version || showdefaults)
471 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
472 if (nfss->mountd_port || showdefaults)
473 seq_printf(m, ",mountport=%u", nfss->mountd_port);
475 switch (nfss->mountd_protocol) {
477 seq_printf(m, ",mountproto=udp");
480 seq_printf(m, ",mountproto=tcp");
484 seq_printf(m, ",mountproto=auto");
489 * Describe the mount options in force on this server representation
491 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
494 static const struct proc_nfs_info {
499 { NFS_MOUNT_SOFT, ",soft", ",hard" },
500 { NFS_MOUNT_INTR, ",intr", ",nointr" },
501 { NFS_MOUNT_POSIX, ",posix", "" },
502 { NFS_MOUNT_NOCTO, ",nocto", "" },
503 { NFS_MOUNT_NOAC, ",noac", "" },
504 { NFS_MOUNT_NONLM, ",nolock", "" },
505 { NFS_MOUNT_NOACL, ",noacl", "" },
506 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
507 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
510 const struct proc_nfs_info *nfs_infop;
511 struct nfs_client *clp = nfss->nfs_client;
512 u32 version = clp->rpc_ops->version;
514 seq_printf(m, ",vers=%u", version);
515 seq_printf(m, ",rsize=%u", nfss->rsize);
516 seq_printf(m, ",wsize=%u", nfss->wsize);
517 if (nfss->bsize != 0)
518 seq_printf(m, ",bsize=%u", nfss->bsize);
519 seq_printf(m, ",namlen=%u", nfss->namelen);
520 if (nfss->acregmin != 3*HZ || showdefaults)
521 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
522 if (nfss->acregmax != 60*HZ || showdefaults)
523 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
524 if (nfss->acdirmin != 30*HZ || showdefaults)
525 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
526 if (nfss->acdirmax != 60*HZ || showdefaults)
527 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
528 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
529 if (nfss->flags & nfs_infop->flag)
530 seq_puts(m, nfs_infop->str);
532 seq_puts(m, nfs_infop->nostr);
534 seq_printf(m, ",proto=%s",
535 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
537 if (nfss->port != NFS_PORT)
538 seq_printf(m, ",port=%u", nfss->port);
541 seq_printf(m, ",port=%u", nfss->port);
543 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
544 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
545 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
548 nfs_show_mountd_options(m, nfss, showdefaults);
551 if (clp->rpc_ops->version == 4)
552 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
557 * Describe the mount options on this VFS mountpoint
559 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
561 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
563 nfs_show_mount_options(m, nfss, 0);
565 seq_printf(m, ",addr=%s",
566 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
573 * Present statistical information for this VFS mountpoint
575 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
578 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
579 struct rpc_auth *auth = nfss->client->cl_auth;
580 struct nfs_iostats totals = { };
582 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
585 * Display all mount option settings
587 seq_printf(m, "\n\topts:\t");
588 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
589 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
590 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
591 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
592 nfs_show_mount_options(m, nfss, 1);
594 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
596 seq_printf(m, "\n\tcaps:\t");
597 seq_printf(m, "caps=0x%x", nfss->caps);
598 seq_printf(m, ",wtmult=%u", nfss->wtmult);
599 seq_printf(m, ",dtsize=%u", nfss->dtsize);
600 seq_printf(m, ",bsize=%u", nfss->bsize);
601 seq_printf(m, ",namlen=%u", nfss->namelen);
604 if (nfss->nfs_client->rpc_ops->version == 4) {
605 seq_printf(m, "\n\tnfsv4:\t");
606 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
607 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
608 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
613 * Display security flavor in effect for this mount
615 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
617 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
620 * Display superblock I/O counters
622 for_each_possible_cpu(cpu) {
623 struct nfs_iostats *stats;
626 stats = per_cpu_ptr(nfss->io_stats, cpu);
628 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
629 totals.events[i] += stats->events[i];
630 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
631 totals.bytes[i] += stats->bytes[i];
636 seq_printf(m, "\n\tevents:\t");
637 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
638 seq_printf(m, "%lu ", totals.events[i]);
639 seq_printf(m, "\n\tbytes:\t");
640 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
641 seq_printf(m, "%Lu ", totals.bytes[i]);
644 rpc_print_iostats(m, nfss->client);
650 * Begin unmount by attempting to remove all automounted mountpoints we added
651 * in response to xdev traversals and referrals
653 static void nfs_umount_begin(struct super_block *sb)
655 struct nfs_server *server = NFS_SB(sb);
656 struct rpc_clnt *rpc;
658 /* -EIO all pending I/O */
659 rpc = server->client_acl;
661 rpc_killall_tasks(rpc);
662 rpc = server->client;
664 rpc_killall_tasks(rpc);
668 * Set the port number in an address. Be agnostic about the address family.
670 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
672 switch (sap->sa_family) {
674 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
675 ap->sin_port = htons(port);
679 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
680 ap->sin6_port = htons(port);
687 * Sanity-check a server address provided by the mount command.
689 * Address family must be initialized, and address must not be
690 * the ANY address for that family.
692 static int nfs_verify_server_address(struct sockaddr *addr)
694 switch (addr->sa_family) {
696 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
697 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
700 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
701 return !ipv6_addr_any(sa);
709 * Parse string addresses passed in via a mount option,
710 * and construct a sockaddr based on the result.
712 * If address parsing fails, set the sockaddr's address
713 * family to AF_UNSPEC to force nfs_verify_server_address()
716 static void nfs_parse_server_address(char *value,
717 struct sockaddr *sap,
720 if (strchr(value, ':')) {
721 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
722 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
724 ap->sin6_family = AF_INET6;
726 if (in6_pton(value, -1, addr, '\0', NULL))
729 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
730 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
732 ap->sin_family = AF_INET;
734 if (in4_pton(value, -1, addr, '\0', NULL))
738 sap->sa_family = AF_UNSPEC;
743 * Error-check and convert a string of mount options from user space into
746 static int nfs_parse_mount_options(char *raw,
747 struct nfs_parsed_mount_data *mnt)
749 char *p, *string, *secdata;
753 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
756 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
758 secdata = alloc_secdata();
762 rc = security_sb_copy_data(raw, secdata);
764 goto out_security_failure;
766 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
768 goto out_security_failure;
770 free_secdata(secdata);
772 while ((p = strsep(&raw, ",")) != NULL) {
773 substring_t args[MAX_OPT_ARGS];
779 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
781 token = match_token(p, nfs_mount_option_tokens, args);
784 mnt->flags |= NFS_MOUNT_SOFT;
787 mnt->flags &= ~NFS_MOUNT_SOFT;
793 mnt->flags |= NFS_MOUNT_POSIX;
796 mnt->flags &= ~NFS_MOUNT_POSIX;
799 mnt->flags &= ~NFS_MOUNT_NOCTO;
802 mnt->flags |= NFS_MOUNT_NOCTO;
805 mnt->flags &= ~NFS_MOUNT_NOAC;
808 mnt->flags |= NFS_MOUNT_NOAC;
811 mnt->flags &= ~NFS_MOUNT_NONLM;
814 mnt->flags |= NFS_MOUNT_NONLM;
817 mnt->flags &= ~NFS_MOUNT_VER3;
820 mnt->flags |= NFS_MOUNT_VER3;
823 mnt->flags &= ~NFS_MOUNT_TCP;
824 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
829 mnt->flags |= NFS_MOUNT_TCP;
830 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
835 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
836 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
841 mnt->flags &= ~NFS_MOUNT_NOACL;
844 mnt->flags |= NFS_MOUNT_NOACL;
847 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
850 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
853 mnt->flags &= ~NFS_MOUNT_UNSHARED;
855 case Opt_nosharecache:
856 mnt->flags |= NFS_MOUNT_UNSHARED;
860 if (match_int(args, &option))
862 if (option < 0 || option > 65535)
864 mnt->nfs_server.port = option;
867 if (match_int(args, &mnt->rsize))
871 if (match_int(args, &mnt->wsize))
875 if (match_int(args, &option))
882 if (match_int(args, &mnt->timeo))
886 if (match_int(args, &mnt->retrans))
890 if (match_int(args, &mnt->acregmin))
894 if (match_int(args, &mnt->acregmax))
898 if (match_int(args, &mnt->acdirmin))
902 if (match_int(args, &mnt->acdirmax))
906 if (match_int(args, &option))
913 mnt->acdirmax = option;
916 if (match_int(args, &mnt->namlen))
920 if (match_int(args, &option))
922 if (option < 0 || option > 65535)
924 mnt->mount_server.port = option;
927 if (match_int(args, &option))
931 mnt->mount_server.version = option;
934 if (match_int(args, &option))
938 mnt->flags &= ~NFS_MOUNT_VER3;
941 mnt->flags |= NFS_MOUNT_VER3;
949 string = match_strdup(args);
952 token = match_token(string, nfs_secflavor_tokens, args);
956 * The flags setting is for v2/v3. The flavor_len
957 * setting is for v4. v2/v3 also need to know the
958 * difference between NULL and UNIX.
962 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
963 mnt->auth_flavor_len = 0;
964 mnt->auth_flavors[0] = RPC_AUTH_NULL;
967 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
968 mnt->auth_flavor_len = 0;
969 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
972 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
973 mnt->auth_flavor_len = 1;
974 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
977 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
978 mnt->auth_flavor_len = 1;
979 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
982 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
983 mnt->auth_flavor_len = 1;
984 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
987 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
988 mnt->auth_flavor_len = 1;
989 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
992 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
993 mnt->auth_flavor_len = 1;
994 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
997 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
998 mnt->auth_flavor_len = 1;
999 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1002 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1003 mnt->auth_flavor_len = 1;
1004 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1007 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1008 mnt->auth_flavor_len = 1;
1009 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1012 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1013 mnt->auth_flavor_len = 1;
1014 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1021 string = match_strdup(args);
1024 token = match_token(string,
1025 nfs_xprt_protocol_tokens, args);
1030 mnt->flags &= ~NFS_MOUNT_TCP;
1031 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1036 mnt->flags |= NFS_MOUNT_TCP;
1037 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1042 /* vector side protocols to TCP */
1043 mnt->flags |= NFS_MOUNT_TCP;
1044 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1049 goto out_unrec_xprt;
1052 case Opt_mountproto:
1053 string = match_strdup(args);
1056 token = match_token(string,
1057 nfs_xprt_protocol_tokens, args);
1062 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1065 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1067 case Opt_xprt_rdma: /* not used for side protocols */
1069 goto out_unrec_xprt;
1073 string = match_strdup(args);
1076 nfs_parse_server_address(string, (struct sockaddr *)
1077 &mnt->nfs_server.address,
1078 &mnt->nfs_server.addrlen);
1081 case Opt_clientaddr:
1082 string = match_strdup(args);
1085 kfree(mnt->client_address);
1086 mnt->client_address = string;
1089 string = match_strdup(args);
1092 kfree(mnt->mount_server.hostname);
1093 mnt->mount_server.hostname = string;
1096 string = match_strdup(args);
1099 nfs_parse_server_address(string, (struct sockaddr *)
1100 &mnt->mount_server.address,
1101 &mnt->mount_server.addrlen);
1106 case Opt_deprecated:
1114 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1115 mnt->nfs_server.port);
1120 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1122 out_security_failure:
1123 free_secdata(secdata);
1124 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1127 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1131 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1135 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1139 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1144 * Use the remote server's MOUNT service to request the NFS file handle
1145 * corresponding to the provided path.
1147 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1148 struct nfs_fh *root_fh)
1150 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1154 if (args->mount_server.version == 0) {
1155 if (args->flags & NFS_MOUNT_VER3)
1156 args->mount_server.version = NFS_MNT3_VERSION;
1158 args->mount_server.version = NFS_MNT_VERSION;
1161 if (args->mount_server.hostname)
1162 hostname = args->mount_server.hostname;
1164 hostname = args->nfs_server.hostname;
1167 * Construct the mount server's address.
1169 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1170 memcpy(sap, &args->nfs_server.address,
1171 args->nfs_server.addrlen);
1172 args->mount_server.addrlen = args->nfs_server.addrlen;
1176 * autobind will be used if mount_server.port == 0
1178 nfs_set_port(sap, args->mount_server.port);
1181 * Now ask the mount server to map our export path
1184 status = nfs_mount(sap,
1185 args->mount_server.addrlen,
1187 args->nfs_server.export_path,
1188 args->mount_server.version,
1189 args->mount_server.protocol,
1194 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1200 * Validate the NFS2/NFS3 mount data
1201 * - fills in the mount root filehandle
1203 * For option strings, user space handles the following behaviors:
1205 * + DNS: mapping server host name to IP address ("addr=" option)
1207 * + failure mode: how to behave if a mount request can't be handled
1208 * immediately ("fg/bg" option)
1210 * + retry: how often to retry a mount request ("retry=" option)
1212 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1213 * mountproto=tcp after mountproto=udp, and so on
1215 static int nfs_validate_mount_data(void *options,
1216 struct nfs_parsed_mount_data *args,
1217 struct nfs_fh *mntfh,
1218 const char *dev_name)
1220 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1225 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1226 args->rsize = NFS_MAX_FILE_IO_SIZE;
1227 args->wsize = NFS_MAX_FILE_IO_SIZE;
1231 args->acregmax = 60;
1232 args->acdirmin = 30;
1233 args->acdirmax = 60;
1234 args->mount_server.port = 0; /* autobind unless user sets port */
1235 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1236 args->nfs_server.port = 0; /* autobind unless user sets port */
1237 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1239 switch (data->version) {
1245 if (data->flags & NFS_MOUNT_VER3)
1247 data->root.size = NFS2_FHSIZE;
1248 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1250 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1253 memset(data->context, 0, sizeof(data->context));
1255 if (data->flags & NFS_MOUNT_VER3) {
1256 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1257 goto out_invalid_fh;
1258 mntfh->size = data->root.size;
1260 mntfh->size = NFS2_FHSIZE;
1263 memcpy(mntfh->data, data->root.data, mntfh->size);
1264 if (mntfh->size < sizeof(mntfh->data))
1265 memset(mntfh->data + mntfh->size, 0,
1266 sizeof(mntfh->data) - mntfh->size);
1269 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1272 args->flags = data->flags;
1273 args->rsize = data->rsize;
1274 args->wsize = data->wsize;
1275 args->timeo = data->timeo;
1276 args->retrans = data->retrans;
1277 args->acregmin = data->acregmin;
1278 args->acregmax = data->acregmax;
1279 args->acdirmin = data->acdirmin;
1280 args->acdirmax = data->acdirmax;
1282 memcpy(&args->nfs_server.address, &data->addr,
1283 sizeof(data->addr));
1284 args->nfs_server.addrlen = sizeof(data->addr);
1285 if (!nfs_verify_server_address((struct sockaddr *)
1286 &args->nfs_server.address))
1287 goto out_no_address;
1289 if (!(data->flags & NFS_MOUNT_TCP))
1290 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1291 /* N.B. caller will free nfs_server.hostname in all cases */
1292 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1293 args->namlen = data->namlen;
1294 args->bsize = data->bsize;
1295 args->auth_flavors[0] = data->pseudoflavor;
1296 if (!args->nfs_server.hostname)
1300 * The legacy version 6 binary mount data from userspace has a
1301 * field used only to transport selinux information into the
1302 * the kernel. To continue to support that functionality we
1303 * have a touch of selinux knowledge here in the NFS code. The
1304 * userspace code converted context=blah to just blah so we are
1305 * converting back to the full string selinux understands.
1307 if (data->context[0]){
1308 #ifdef CONFIG_SECURITY_SELINUX
1310 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1313 strcpy(opts_str, "context=");
1314 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1315 strcat(opts_str, &data->context[0]);
1316 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1331 if (nfs_parse_mount_options((char *)options, args) == 0)
1334 if (!nfs_verify_server_address((struct sockaddr *)
1335 &args->nfs_server.address))
1336 goto out_no_address;
1338 c = strchr(dev_name, ':');
1342 /* N.B. caller will free nfs_server.hostname in all cases */
1343 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1344 if (!args->nfs_server.hostname)
1348 if (strlen(c) > NFS_MAXPATHLEN)
1349 return -ENAMETOOLONG;
1350 args->nfs_server.export_path = c;
1352 status = nfs_try_mount(args, mntfh);
1360 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1361 args->auth_flavors[0] = RPC_AUTH_UNIX;
1363 #ifndef CONFIG_NFS_V3
1364 if (args->flags & NFS_MOUNT_VER3)
1365 goto out_v3_not_compiled;
1366 #endif /* !CONFIG_NFS_V3 */
1371 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1375 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1380 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1383 #ifndef CONFIG_NFS_V3
1384 out_v3_not_compiled:
1385 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1386 return -EPROTONOSUPPORT;
1387 #endif /* !CONFIG_NFS_V3 */
1390 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1394 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1398 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1403 nfs_compare_remount_data(struct nfs_server *nfss,
1404 struct nfs_parsed_mount_data *data)
1406 if (data->flags != nfss->flags ||
1407 data->rsize != nfss->rsize ||
1408 data->wsize != nfss->wsize ||
1409 data->retrans != nfss->client->cl_timeout->to_retries ||
1410 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1411 data->acregmin != nfss->acregmin / HZ ||
1412 data->acregmax != nfss->acregmax / HZ ||
1413 data->acdirmin != nfss->acdirmin / HZ ||
1414 data->acdirmax != nfss->acdirmax / HZ ||
1415 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1416 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1417 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1418 data->nfs_server.addrlen) != 0)
1425 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1428 struct nfs_server *nfss = sb->s_fs_info;
1429 struct nfs_parsed_mount_data *data;
1430 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1431 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1434 * Userspace mount programs that send binary options generally send
1435 * them populated with default values. We have no way to know which
1436 * ones were explicitly specified. Fall back to legacy behavior and
1437 * just return success.
1439 if ((sb->s_type == &nfs4_fs_type && options4->version == 1) ||
1440 (sb->s_type == &nfs_fs_type && options->version >= 1 &&
1441 options->version <= 6))
1444 data = kzalloc(sizeof(*data), GFP_KERNEL);
1448 /* fill out struct with values from existing mount */
1449 data->flags = nfss->flags;
1450 data->rsize = nfss->rsize;
1451 data->wsize = nfss->wsize;
1452 data->retrans = nfss->client->cl_timeout->to_retries;
1453 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1454 data->acregmin = nfss->acregmin / HZ;
1455 data->acregmax = nfss->acregmax / HZ;
1456 data->acdirmin = nfss->acdirmin / HZ;
1457 data->acdirmax = nfss->acdirmax / HZ;
1458 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1459 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1460 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1461 data->nfs_server.addrlen);
1463 /* overwrite those values with any that were specified */
1464 error = nfs_parse_mount_options((char *)options, data);
1468 /* compare new mount options with old ones */
1469 error = nfs_compare_remount_data(nfss, data);
1476 * Initialise the common bits of the superblock
1478 static inline void nfs_initialise_sb(struct super_block *sb)
1480 struct nfs_server *server = NFS_SB(sb);
1482 sb->s_magic = NFS_SUPER_MAGIC;
1484 /* We probably want something more informative here */
1485 snprintf(sb->s_id, sizeof(sb->s_id),
1486 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1488 if (sb->s_blocksize == 0)
1489 sb->s_blocksize = nfs_block_bits(server->wsize,
1490 &sb->s_blocksize_bits);
1492 if (server->flags & NFS_MOUNT_NOAC)
1493 sb->s_flags |= MS_SYNCHRONOUS;
1495 nfs_super_set_maxbytes(sb, server->maxfilesize);
1499 * Finish setting up an NFS2/3 superblock
1501 static void nfs_fill_super(struct super_block *sb,
1502 struct nfs_parsed_mount_data *data)
1504 struct nfs_server *server = NFS_SB(sb);
1506 sb->s_blocksize_bits = 0;
1507 sb->s_blocksize = 0;
1509 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1511 if (server->flags & NFS_MOUNT_VER3) {
1512 /* The VFS shouldn't apply the umask to mode bits. We will do
1513 * so ourselves when necessary.
1515 sb->s_flags |= MS_POSIXACL;
1516 sb->s_time_gran = 1;
1519 sb->s_op = &nfs_sops;
1520 nfs_initialise_sb(sb);
1524 * Finish setting up a cloned NFS2/3 superblock
1526 static void nfs_clone_super(struct super_block *sb,
1527 const struct super_block *old_sb)
1529 struct nfs_server *server = NFS_SB(sb);
1531 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1532 sb->s_blocksize = old_sb->s_blocksize;
1533 sb->s_maxbytes = old_sb->s_maxbytes;
1535 if (server->flags & NFS_MOUNT_VER3) {
1536 /* The VFS shouldn't apply the umask to mode bits. We will do
1537 * so ourselves when necessary.
1539 sb->s_flags |= MS_POSIXACL;
1540 sb->s_time_gran = 1;
1543 sb->s_op = old_sb->s_op;
1544 nfs_initialise_sb(sb);
1547 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1549 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1551 const struct nfs_server *a = s->s_fs_info;
1552 const struct rpc_clnt *clnt_a = a->client;
1553 const struct rpc_clnt *clnt_b = b->client;
1555 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1557 if (a->nfs_client != b->nfs_client)
1559 if (a->flags != b->flags)
1561 if (a->wsize != b->wsize)
1563 if (a->rsize != b->rsize)
1565 if (a->acregmin != b->acregmin)
1567 if (a->acregmax != b->acregmax)
1569 if (a->acdirmin != b->acdirmin)
1571 if (a->acdirmax != b->acdirmax)
1573 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1580 struct nfs_sb_mountdata {
1581 struct nfs_server *server;
1585 static int nfs_set_super(struct super_block *s, void *data)
1587 struct nfs_sb_mountdata *sb_mntdata = data;
1588 struct nfs_server *server = sb_mntdata->server;
1591 s->s_flags = sb_mntdata->mntflags;
1592 s->s_fs_info = server;
1593 ret = set_anon_super(s, server);
1595 server->s_dev = s->s_dev;
1599 static int nfs_compare_super_address(struct nfs_server *server1,
1600 struct nfs_server *server2)
1602 struct sockaddr *sap1, *sap2;
1604 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1605 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1607 if (sap1->sa_family != sap2->sa_family)
1610 switch (sap1->sa_family) {
1612 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1613 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1614 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1616 if (sin1->sin_port != sin2->sin_port)
1621 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1622 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1623 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1625 if (sin1->sin6_port != sin2->sin6_port)
1636 static int nfs_compare_super(struct super_block *sb, void *data)
1638 struct nfs_sb_mountdata *sb_mntdata = data;
1639 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1640 int mntflags = sb_mntdata->mntflags;
1642 if (!nfs_compare_super_address(old, server))
1644 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1645 if (old->flags & NFS_MOUNT_UNSHARED)
1647 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1649 return nfs_compare_mount_options(sb, server, mntflags);
1652 static int nfs_bdi_register(struct nfs_server *server)
1654 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1657 static int nfs_get_sb(struct file_system_type *fs_type,
1658 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1660 struct nfs_server *server = NULL;
1661 struct super_block *s;
1662 struct nfs_parsed_mount_data *data;
1663 struct nfs_fh *mntfh;
1664 struct dentry *mntroot;
1665 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1666 struct nfs_sb_mountdata sb_mntdata = {
1669 int error = -ENOMEM;
1671 data = kzalloc(sizeof(*data), GFP_KERNEL);
1672 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1673 if (data == NULL || mntfh == NULL)
1676 security_init_mnt_opts(&data->lsm_opts);
1678 /* Validate the mount data */
1679 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1683 /* Get a volume representation */
1684 server = nfs_create_server(data, mntfh);
1685 if (IS_ERR(server)) {
1686 error = PTR_ERR(server);
1689 sb_mntdata.server = server;
1691 if (server->flags & NFS_MOUNT_UNSHARED)
1692 compare_super = NULL;
1694 /* Get a superblock - note that we may end up sharing one that already exists */
1695 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1701 if (s->s_fs_info != server) {
1702 nfs_free_server(server);
1705 error = nfs_bdi_register(server);
1707 goto error_splat_super;
1711 /* initial superblock/root creation */
1712 nfs_fill_super(s, data);
1715 mntroot = nfs_get_root(s, mntfh);
1716 if (IS_ERR(mntroot)) {
1717 error = PTR_ERR(mntroot);
1718 goto error_splat_super;
1721 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1723 goto error_splat_root;
1725 s->s_flags |= MS_ACTIVE;
1727 mnt->mnt_root = mntroot;
1731 kfree(data->nfs_server.hostname);
1732 kfree(data->mount_server.hostname);
1733 security_free_mnt_opts(&data->lsm_opts);
1740 nfs_free_server(server);
1746 up_write(&s->s_umount);
1747 deactivate_super(s);
1752 * Destroy an NFS2/3 superblock
1754 static void nfs_kill_super(struct super_block *s)
1756 struct nfs_server *server = NFS_SB(s);
1758 bdi_unregister(&server->backing_dev_info);
1760 nfs_free_server(server);
1764 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1766 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1767 const char *dev_name, void *raw_data,
1768 struct vfsmount *mnt)
1770 struct nfs_clone_mount *data = raw_data;
1771 struct super_block *s;
1772 struct nfs_server *server;
1773 struct dentry *mntroot;
1774 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1775 struct nfs_sb_mountdata sb_mntdata = {
1780 dprintk("--> nfs_xdev_get_sb()\n");
1782 /* create a new volume representation */
1783 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1784 if (IS_ERR(server)) {
1785 error = PTR_ERR(server);
1786 goto out_err_noserver;
1788 sb_mntdata.server = server;
1790 if (server->flags & NFS_MOUNT_UNSHARED)
1791 compare_super = NULL;
1793 /* Get a superblock - note that we may end up sharing one that already exists */
1794 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1800 if (s->s_fs_info != server) {
1801 nfs_free_server(server);
1804 error = nfs_bdi_register(server);
1806 goto error_splat_super;
1810 /* initial superblock/root creation */
1811 nfs_clone_super(s, data->sb);
1814 mntroot = nfs_get_root(s, data->fh);
1815 if (IS_ERR(mntroot)) {
1816 error = PTR_ERR(mntroot);
1817 goto error_splat_super;
1819 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1822 goto error_splat_super;
1825 s->s_flags |= MS_ACTIVE;
1827 mnt->mnt_root = mntroot;
1829 /* clone any lsm security options from the parent to the new sb */
1830 security_sb_clone_mnt_opts(data->sb, s);
1832 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1836 nfs_free_server(server);
1838 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1842 up_write(&s->s_umount);
1843 deactivate_super(s);
1844 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1848 #ifdef CONFIG_NFS_V4
1851 * Finish setting up a cloned NFS4 superblock
1853 static void nfs4_clone_super(struct super_block *sb,
1854 const struct super_block *old_sb)
1856 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1857 sb->s_blocksize = old_sb->s_blocksize;
1858 sb->s_maxbytes = old_sb->s_maxbytes;
1859 sb->s_time_gran = 1;
1860 sb->s_op = old_sb->s_op;
1861 nfs_initialise_sb(sb);
1865 * Set up an NFS4 superblock
1867 static void nfs4_fill_super(struct super_block *sb)
1869 sb->s_time_gran = 1;
1870 sb->s_op = &nfs4_sops;
1871 nfs_initialise_sb(sb);
1875 * Validate NFSv4 mount options
1877 static int nfs4_validate_mount_data(void *options,
1878 struct nfs_parsed_mount_data *args,
1879 const char *dev_name)
1881 struct sockaddr_in *ap;
1882 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1888 args->rsize = NFS_MAX_FILE_IO_SIZE;
1889 args->wsize = NFS_MAX_FILE_IO_SIZE;
1893 args->acregmax = 60;
1894 args->acdirmin = 30;
1895 args->acdirmax = 60;
1896 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
1897 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1899 switch (data->version) {
1901 ap = (struct sockaddr_in *)&args->nfs_server.address;
1902 if (data->host_addrlen > sizeof(args->nfs_server.address))
1903 goto out_no_address;
1904 if (data->host_addrlen == 0)
1905 goto out_no_address;
1906 args->nfs_server.addrlen = data->host_addrlen;
1907 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1909 if (!nfs_verify_server_address((struct sockaddr *)
1910 &args->nfs_server.address))
1911 goto out_no_address;
1913 switch (data->auth_flavourlen) {
1915 args->auth_flavors[0] = RPC_AUTH_UNIX;
1918 if (copy_from_user(&args->auth_flavors[0],
1919 data->auth_flavours,
1920 sizeof(args->auth_flavors[0])))
1924 goto out_inval_auth;
1927 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1930 args->nfs_server.hostname = c;
1932 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1935 args->nfs_server.export_path = c;
1936 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1938 c = strndup_user(data->client_addr.data, 16);
1941 args->client_address = c;
1944 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1948 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1949 args->rsize = data->rsize;
1950 args->wsize = data->wsize;
1951 args->timeo = data->timeo;
1952 args->retrans = data->retrans;
1953 args->acregmin = data->acregmin;
1954 args->acregmax = data->acregmax;
1955 args->acdirmin = data->acdirmin;
1956 args->acdirmax = data->acdirmax;
1957 args->nfs_server.protocol = data->proto;
1963 if (nfs_parse_mount_options((char *)options, args) == 0)
1966 if (!nfs_verify_server_address((struct sockaddr *)
1967 &args->nfs_server.address))
1970 switch (args->auth_flavor_len) {
1972 args->auth_flavors[0] = RPC_AUTH_UNIX;
1977 goto out_inval_auth;
1981 * Split "dev_name" into "hostname:mntpath".
1983 c = strchr(dev_name, ':');
1986 /* while calculating len, pretend ':' is '\0' */
1988 if (len > NFS4_MAXNAMLEN)
1989 return -ENAMETOOLONG;
1990 /* N.B. caller will free nfs_server.hostname in all cases */
1991 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1992 if (!args->nfs_server.hostname)
1995 c++; /* step over the ':' */
1997 if (len > NFS4_MAXPATHLEN)
1998 return -ENAMETOOLONG;
1999 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
2000 if (!args->nfs_server.export_path)
2003 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
2005 if (args->client_address == NULL)
2006 goto out_no_client_address;
2015 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2019 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2020 data->auth_flavourlen);
2024 dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
2028 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2031 out_no_client_address:
2032 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2037 * Get the superblock for an NFS4 mountpoint
2039 static int nfs4_get_sb(struct file_system_type *fs_type,
2040 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2042 struct nfs_parsed_mount_data *data;
2043 struct super_block *s;
2044 struct nfs_server *server;
2045 struct nfs_fh *mntfh;
2046 struct dentry *mntroot;
2047 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2048 struct nfs_sb_mountdata sb_mntdata = {
2051 int error = -ENOMEM;
2053 data = kzalloc(sizeof(*data), GFP_KERNEL);
2054 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2055 if (data == NULL || mntfh == NULL)
2058 security_init_mnt_opts(&data->lsm_opts);
2060 /* Validate the mount data */
2061 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2065 /* Get a volume representation */
2066 server = nfs4_create_server(data, mntfh);
2067 if (IS_ERR(server)) {
2068 error = PTR_ERR(server);
2071 sb_mntdata.server = server;
2073 if (server->flags & NFS4_MOUNT_UNSHARED)
2074 compare_super = NULL;
2076 /* Get a superblock - note that we may end up sharing one that already exists */
2077 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2083 if (s->s_fs_info != server) {
2084 nfs_free_server(server);
2087 error = nfs_bdi_register(server);
2089 goto error_splat_super;
2093 /* initial superblock/root creation */
2097 mntroot = nfs4_get_root(s, mntfh);
2098 if (IS_ERR(mntroot)) {
2099 error = PTR_ERR(mntroot);
2100 goto error_splat_super;
2103 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2105 goto error_splat_root;
2107 s->s_flags |= MS_ACTIVE;
2109 mnt->mnt_root = mntroot;
2113 kfree(data->client_address);
2114 kfree(data->nfs_server.export_path);
2115 kfree(data->nfs_server.hostname);
2116 security_free_mnt_opts(&data->lsm_opts);
2123 nfs_free_server(server);
2129 up_write(&s->s_umount);
2130 deactivate_super(s);
2134 static void nfs4_kill_super(struct super_block *sb)
2136 struct nfs_server *server = NFS_SB(sb);
2138 nfs_return_all_delegations(sb);
2139 kill_anon_super(sb);
2141 nfs4_renewd_prepare_shutdown(server);
2142 nfs_free_server(server);
2146 * Clone an NFS4 server record on xdev traversal (FSID-change)
2148 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2149 const char *dev_name, void *raw_data,
2150 struct vfsmount *mnt)
2152 struct nfs_clone_mount *data = raw_data;
2153 struct super_block *s;
2154 struct nfs_server *server;
2155 struct dentry *mntroot;
2156 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2157 struct nfs_sb_mountdata sb_mntdata = {
2162 dprintk("--> nfs4_xdev_get_sb()\n");
2164 /* create a new volume representation */
2165 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2166 if (IS_ERR(server)) {
2167 error = PTR_ERR(server);
2168 goto out_err_noserver;
2170 sb_mntdata.server = server;
2172 if (server->flags & NFS4_MOUNT_UNSHARED)
2173 compare_super = NULL;
2175 /* Get a superblock - note that we may end up sharing one that already exists */
2176 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2182 if (s->s_fs_info != server) {
2183 nfs_free_server(server);
2186 error = nfs_bdi_register(server);
2188 goto error_splat_super;
2192 /* initial superblock/root creation */
2193 nfs4_clone_super(s, data->sb);
2196 mntroot = nfs4_get_root(s, data->fh);
2197 if (IS_ERR(mntroot)) {
2198 error = PTR_ERR(mntroot);
2199 goto error_splat_super;
2201 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2204 goto error_splat_super;
2207 s->s_flags |= MS_ACTIVE;
2209 mnt->mnt_root = mntroot;
2211 security_sb_clone_mnt_opts(data->sb, s);
2213 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2217 nfs_free_server(server);
2219 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2223 up_write(&s->s_umount);
2224 deactivate_super(s);
2225 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2230 * Create an NFS4 server record on referral traversal
2232 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2233 const char *dev_name, void *raw_data,
2234 struct vfsmount *mnt)
2236 struct nfs_clone_mount *data = raw_data;
2237 struct super_block *s;
2238 struct nfs_server *server;
2239 struct dentry *mntroot;
2240 struct nfs_fh mntfh;
2241 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2242 struct nfs_sb_mountdata sb_mntdata = {
2247 dprintk("--> nfs4_referral_get_sb()\n");
2249 /* create a new volume representation */
2250 server = nfs4_create_referral_server(data, &mntfh);
2251 if (IS_ERR(server)) {
2252 error = PTR_ERR(server);
2253 goto out_err_noserver;
2255 sb_mntdata.server = server;
2257 if (server->flags & NFS4_MOUNT_UNSHARED)
2258 compare_super = NULL;
2260 /* Get a superblock - note that we may end up sharing one that already exists */
2261 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2267 if (s->s_fs_info != server) {
2268 nfs_free_server(server);
2271 error = nfs_bdi_register(server);
2273 goto error_splat_super;
2277 /* initial superblock/root creation */
2281 mntroot = nfs4_get_root(s, &mntfh);
2282 if (IS_ERR(mntroot)) {
2283 error = PTR_ERR(mntroot);
2284 goto error_splat_super;
2286 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2289 goto error_splat_super;
2292 s->s_flags |= MS_ACTIVE;
2294 mnt->mnt_root = mntroot;
2296 security_sb_clone_mnt_opts(data->sb, s);
2298 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2302 nfs_free_server(server);
2304 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2308 up_write(&s->s_umount);
2309 deactivate_super(s);
2310 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2314 #endif /* CONFIG_NFS_V4 */