4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/mnt_namespace.h>
46 #include <linux/namei.h>
47 #include <linux/nfs_idmap.h>
48 #include <linux/vfs.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
62 #include "delegation.h"
67 #define NFSDBG_FACILITY NFSDBG_VFS
70 /* Mount options that take no arguments */
72 Opt_posix, Opt_noposix,
77 Opt_udp, Opt_tcp, Opt_rdma,
79 Opt_rdirplus, Opt_nordirplus,
80 Opt_sharecache, Opt_nosharecache,
81 Opt_resvport, Opt_noresvport,
82 Opt_fscache, Opt_nofscache,
84 /* Mount options that take integer arguments */
86 Opt_rsize, Opt_wsize, Opt_bsize,
87 Opt_timeo, Opt_retrans,
88 Opt_acregmin, Opt_acregmax,
89 Opt_acdirmin, Opt_acdirmax,
97 /* Mount options that take string arguments */
98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
109 static const match_table_t nfs_mount_option_tokens = {
110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
112 { Opt_userspace, "retry=%s" },
114 { Opt_sloppy, "sloppy" },
116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
120 { Opt_posix, "posix" },
121 { Opt_noposix, "noposix" },
123 { Opt_nocto, "nocto" },
125 { Opt_noac, "noac" },
126 { Opt_lock, "lock" },
127 { Opt_nolock, "nolock" },
132 { Opt_rdma, "rdma" },
134 { Opt_noacl, "noacl" },
135 { Opt_rdirplus, "rdirplus" },
136 { Opt_nordirplus, "nordirplus" },
137 { Opt_sharecache, "sharecache" },
138 { Opt_nosharecache, "nosharecache" },
139 { Opt_resvport, "resvport" },
140 { Opt_noresvport, "noresvport" },
141 { Opt_fscache, "fsc" },
142 { Opt_fscache_uniq, "fsc=%s" },
143 { Opt_nofscache, "nofsc" },
145 { Opt_port, "port=%s" },
146 { Opt_rsize, "rsize=%s" },
147 { Opt_wsize, "wsize=%s" },
148 { Opt_bsize, "bsize=%s" },
149 { Opt_timeo, "timeo=%s" },
150 { Opt_retrans, "retrans=%s" },
151 { Opt_acregmin, "acregmin=%s" },
152 { Opt_acregmax, "acregmax=%s" },
153 { Opt_acdirmin, "acdirmin=%s" },
154 { Opt_acdirmax, "acdirmax=%s" },
155 { Opt_actimeo, "actimeo=%s" },
156 { Opt_namelen, "namlen=%s" },
157 { Opt_mountport, "mountport=%s" },
158 { Opt_mountvers, "mountvers=%s" },
159 { Opt_nfsvers, "nfsvers=%s" },
160 { Opt_nfsvers, "vers=%s" },
161 { Opt_minorversion, "minorversion=%s" },
163 { Opt_sec, "sec=%s" },
164 { Opt_proto, "proto=%s" },
165 { Opt_mountproto, "mountproto=%s" },
166 { Opt_addr, "addr=%s" },
167 { Opt_clientaddr, "clientaddr=%s" },
168 { Opt_mounthost, "mounthost=%s" },
169 { Opt_mountaddr, "mountaddr=%s" },
171 { Opt_lookupcache, "lookupcache=%s" },
177 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
182 static const match_table_t nfs_xprt_protocol_tokens = {
183 { Opt_xprt_udp, "udp" },
184 { Opt_xprt_tcp, "tcp" },
185 { Opt_xprt_rdma, "rdma" },
187 { Opt_xprt_err, NULL }
191 Opt_sec_none, Opt_sec_sys,
192 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
193 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
194 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
199 static const match_table_t nfs_secflavor_tokens = {
200 { Opt_sec_none, "none" },
201 { Opt_sec_none, "null" },
202 { Opt_sec_sys, "sys" },
204 { Opt_sec_krb5, "krb5" },
205 { Opt_sec_krb5i, "krb5i" },
206 { Opt_sec_krb5p, "krb5p" },
208 { Opt_sec_lkey, "lkey" },
209 { Opt_sec_lkeyi, "lkeyi" },
210 { Opt_sec_lkeyp, "lkeyp" },
212 { Opt_sec_spkm, "spkm3" },
213 { Opt_sec_spkmi, "spkm3i" },
214 { Opt_sec_spkmp, "spkm3p" },
216 { Opt_sec_err, NULL }
220 Opt_lookupcache_all, Opt_lookupcache_positive,
221 Opt_lookupcache_none,
226 static match_table_t nfs_lookupcache_tokens = {
227 { Opt_lookupcache_all, "all" },
228 { Opt_lookupcache_positive, "pos" },
229 { Opt_lookupcache_positive, "positive" },
230 { Opt_lookupcache_none, "none" },
232 { Opt_lookupcache_err, NULL }
236 static void nfs_umount_begin(struct super_block *);
237 static int nfs_statfs(struct dentry *, struct kstatfs *);
238 static int nfs_show_options(struct seq_file *, struct vfsmount *);
239 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
240 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
241 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
242 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
243 static void nfs_kill_super(struct super_block *);
244 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
246 static struct file_system_type nfs_fs_type = {
247 .owner = THIS_MODULE,
249 .get_sb = nfs_get_sb,
250 .kill_sb = nfs_kill_super,
251 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
254 struct file_system_type nfs_xdev_fs_type = {
255 .owner = THIS_MODULE,
257 .get_sb = nfs_xdev_get_sb,
258 .kill_sb = nfs_kill_super,
259 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
262 static const struct super_operations nfs_sops = {
263 .alloc_inode = nfs_alloc_inode,
264 .destroy_inode = nfs_destroy_inode,
265 .write_inode = nfs_write_inode,
266 .statfs = nfs_statfs,
267 .clear_inode = nfs_clear_inode,
268 .umount_begin = nfs_umount_begin,
269 .show_options = nfs_show_options,
270 .show_stats = nfs_show_stats,
271 .remount_fs = nfs_remount,
275 static int nfs4_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
277 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
279 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
280 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
281 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
282 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
283 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
284 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
285 static void nfs4_kill_super(struct super_block *sb);
287 static struct file_system_type nfs4_fs_type = {
288 .owner = THIS_MODULE,
290 .get_sb = nfs4_get_sb,
291 .kill_sb = nfs4_kill_super,
292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
295 static struct file_system_type nfs4_remote_fs_type = {
296 .owner = THIS_MODULE,
298 .get_sb = nfs4_remote_get_sb,
299 .kill_sb = nfs4_kill_super,
300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
303 struct file_system_type nfs4_xdev_fs_type = {
304 .owner = THIS_MODULE,
306 .get_sb = nfs4_xdev_get_sb,
307 .kill_sb = nfs4_kill_super,
308 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
311 static struct file_system_type nfs4_remote_referral_fs_type = {
312 .owner = THIS_MODULE,
314 .get_sb = nfs4_remote_referral_get_sb,
315 .kill_sb = nfs4_kill_super,
316 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
319 struct file_system_type nfs4_referral_fs_type = {
320 .owner = THIS_MODULE,
322 .get_sb = nfs4_referral_get_sb,
323 .kill_sb = nfs4_kill_super,
324 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
327 static const struct super_operations nfs4_sops = {
328 .alloc_inode = nfs_alloc_inode,
329 .destroy_inode = nfs_destroy_inode,
330 .write_inode = nfs_write_inode,
331 .statfs = nfs_statfs,
332 .clear_inode = nfs4_clear_inode,
333 .umount_begin = nfs_umount_begin,
334 .show_options = nfs_show_options,
335 .show_stats = nfs_show_stats,
336 .remount_fs = nfs_remount,
340 static struct shrinker acl_shrinker = {
341 .shrink = nfs_access_cache_shrinker,
342 .seeks = DEFAULT_SEEKS,
346 * Register the NFS filesystems
348 int __init register_nfs_fs(void)
352 ret = register_filesystem(&nfs_fs_type);
356 ret = nfs_register_sysctl();
360 ret = register_filesystem(&nfs4_fs_type);
364 register_shrinker(&acl_shrinker);
369 nfs_unregister_sysctl();
372 unregister_filesystem(&nfs_fs_type);
378 * Unregister the NFS filesystems
380 void __exit unregister_nfs_fs(void)
382 unregister_shrinker(&acl_shrinker);
384 unregister_filesystem(&nfs4_fs_type);
386 nfs_unregister_sysctl();
387 unregister_filesystem(&nfs_fs_type);
390 void nfs_sb_active(struct super_block *sb)
392 struct nfs_server *server = NFS_SB(sb);
394 if (atomic_inc_return(&server->active) == 1)
395 atomic_inc(&sb->s_active);
398 void nfs_sb_deactive(struct super_block *sb)
400 struct nfs_server *server = NFS_SB(sb);
402 if (atomic_dec_and_test(&server->active))
403 deactivate_super(sb);
407 * Deliver file system statistics to userspace
409 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
411 struct nfs_server *server = NFS_SB(dentry->d_sb);
412 unsigned char blockbits;
413 unsigned long blockres;
414 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
415 struct nfs_fattr fattr;
416 struct nfs_fsstat res = {
421 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
424 buf->f_type = NFS_SUPER_MAGIC;
427 * Current versions of glibc do not correctly handle the
428 * case where f_frsize != f_bsize. Eventually we want to
429 * report the value of wtmult in this field.
431 buf->f_frsize = dentry->d_sb->s_blocksize;
434 * On most *nix systems, f_blocks, f_bfree, and f_bavail
435 * are reported in units of f_frsize. Linux hasn't had
436 * an f_frsize field in its statfs struct until recently,
437 * thus historically Linux's sys_statfs reports these
438 * fields in units of f_bsize.
440 buf->f_bsize = dentry->d_sb->s_blocksize;
441 blockbits = dentry->d_sb->s_blocksize_bits;
442 blockres = (1 << blockbits) - 1;
443 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
444 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
445 buf->f_bavail = (res.abytes + blockres) >> blockbits;
447 buf->f_files = res.tfiles;
448 buf->f_ffree = res.afiles;
450 buf->f_namelen = server->namelen;
455 dprintk("%s: statfs error = %d\n", __func__, -error);
460 * Map the security flavour number to a name
462 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
464 static const struct {
465 rpc_authflavor_t flavour;
468 { RPC_AUTH_NULL, "null" },
469 { RPC_AUTH_UNIX, "sys" },
470 { RPC_AUTH_GSS_KRB5, "krb5" },
471 { RPC_AUTH_GSS_KRB5I, "krb5i" },
472 { RPC_AUTH_GSS_KRB5P, "krb5p" },
473 { RPC_AUTH_GSS_LKEY, "lkey" },
474 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
475 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
476 { RPC_AUTH_GSS_SPKM, "spkm" },
477 { RPC_AUTH_GSS_SPKMI, "spkmi" },
478 { RPC_AUTH_GSS_SPKMP, "spkmp" },
479 { UINT_MAX, "unknown" }
483 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
484 if (sec_flavours[i].flavour == flavour)
487 return sec_flavours[i].str;
490 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
493 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
495 switch (sap->sa_family) {
497 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
498 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
502 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
503 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
508 seq_printf(m, ",mountaddr=unspecified");
511 if (nfss->mountd_version || showdefaults)
512 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
513 if (nfss->mountd_port || showdefaults)
514 seq_printf(m, ",mountport=%u", nfss->mountd_port);
516 switch (nfss->mountd_protocol) {
518 seq_printf(m, ",mountproto=udp");
521 seq_printf(m, ",mountproto=tcp");
525 seq_printf(m, ",mountproto=auto");
530 * Describe the mount options in force on this server representation
532 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
535 static const struct proc_nfs_info {
540 { NFS_MOUNT_SOFT, ",soft", ",hard" },
541 { NFS_MOUNT_POSIX, ",posix", "" },
542 { NFS_MOUNT_NOCTO, ",nocto", "" },
543 { NFS_MOUNT_NOAC, ",noac", "" },
544 { NFS_MOUNT_NONLM, ",nolock", "" },
545 { NFS_MOUNT_NOACL, ",noacl", "" },
546 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
547 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
548 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
551 const struct proc_nfs_info *nfs_infop;
552 struct nfs_client *clp = nfss->nfs_client;
553 u32 version = clp->rpc_ops->version;
555 seq_printf(m, ",vers=%u", version);
556 seq_printf(m, ",rsize=%u", nfss->rsize);
557 seq_printf(m, ",wsize=%u", nfss->wsize);
558 if (nfss->bsize != 0)
559 seq_printf(m, ",bsize=%u", nfss->bsize);
560 seq_printf(m, ",namlen=%u", nfss->namelen);
561 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
562 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
563 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
564 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
565 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
566 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
567 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
568 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
569 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
570 if (nfss->flags & nfs_infop->flag)
571 seq_puts(m, nfs_infop->str);
573 seq_puts(m, nfs_infop->nostr);
575 seq_printf(m, ",proto=%s",
576 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
578 if (nfss->port != NFS_PORT)
579 seq_printf(m, ",port=%u", nfss->port);
582 seq_printf(m, ",port=%u", nfss->port);
584 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
585 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
586 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
589 nfs_show_mountd_options(m, nfss, showdefaults);
592 if (clp->rpc_ops->version == 4)
593 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
595 if (nfss->options & NFS_OPTION_FSCACHE)
596 seq_printf(m, ",fsc");
600 * Describe the mount options on this VFS mountpoint
602 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
604 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
606 nfs_show_mount_options(m, nfss, 0);
608 seq_printf(m, ",addr=%s",
609 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
616 * Present statistical information for this VFS mountpoint
618 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
621 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
622 struct rpc_auth *auth = nfss->client->cl_auth;
623 struct nfs_iostats totals = { };
625 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
628 * Display all mount option settings
630 seq_printf(m, "\n\topts:\t");
631 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
632 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
633 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
634 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
635 nfs_show_mount_options(m, nfss, 1);
637 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
639 seq_printf(m, "\n\tcaps:\t");
640 seq_printf(m, "caps=0x%x", nfss->caps);
641 seq_printf(m, ",wtmult=%u", nfss->wtmult);
642 seq_printf(m, ",dtsize=%u", nfss->dtsize);
643 seq_printf(m, ",bsize=%u", nfss->bsize);
644 seq_printf(m, ",namlen=%u", nfss->namelen);
647 if (nfss->nfs_client->rpc_ops->version == 4) {
648 seq_printf(m, "\n\tnfsv4:\t");
649 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
650 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
651 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
656 * Display security flavor in effect for this mount
658 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
660 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
663 * Display superblock I/O counters
665 for_each_possible_cpu(cpu) {
666 struct nfs_iostats *stats;
669 stats = per_cpu_ptr(nfss->io_stats, cpu);
671 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
672 totals.events[i] += stats->events[i];
673 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
674 totals.bytes[i] += stats->bytes[i];
675 #ifdef CONFIG_NFS_FSCACHE
676 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
677 totals.fscache[i] += stats->fscache[i];
683 seq_printf(m, "\n\tevents:\t");
684 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
685 seq_printf(m, "%lu ", totals.events[i]);
686 seq_printf(m, "\n\tbytes:\t");
687 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
688 seq_printf(m, "%Lu ", totals.bytes[i]);
689 #ifdef CONFIG_NFS_FSCACHE
690 if (nfss->options & NFS_OPTION_FSCACHE) {
691 seq_printf(m, "\n\tfsc:\t");
692 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
693 seq_printf(m, "%Lu ", totals.bytes[i]);
698 rpc_print_iostats(m, nfss->client);
704 * Begin unmount by attempting to remove all automounted mountpoints we added
705 * in response to xdev traversals and referrals
707 static void nfs_umount_begin(struct super_block *sb)
709 struct nfs_server *server;
710 struct rpc_clnt *rpc;
715 /* -EIO all pending I/O */
716 rpc = server->client_acl;
718 rpc_killall_tasks(rpc);
719 rpc = server->client;
721 rpc_killall_tasks(rpc);
727 * Sanity-check a server address provided by the mount command.
729 * Address family must be initialized, and address must not be
730 * the ANY address for that family.
732 static int nfs_verify_server_address(struct sockaddr *addr)
734 switch (addr->sa_family) {
736 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
737 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
740 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
741 return !ipv6_addr_any(sa);
748 static void nfs_parse_ipv4_address(char *string, size_t str_len,
749 struct sockaddr *sap, size_t *addr_len)
751 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
752 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
754 if (str_len <= INET_ADDRSTRLEN) {
755 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
756 (int)str_len, string);
758 sin->sin_family = AF_INET;
759 *addr_len = sizeof(*sin);
760 if (in4_pton(string, str_len, addr, '\0', NULL))
764 sap->sa_family = AF_UNSPEC;
768 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
769 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
771 struct sockaddr_in6 *sin6)
776 if ((string + str_len) == delim)
779 if (*delim != IPV6_SCOPE_DELIMITER)
782 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
785 len = (string + str_len) - delim - 1;
786 p = kstrndup(delim + 1, len, GFP_KERNEL);
788 unsigned long scope_id = 0;
789 struct net_device *dev;
791 dev = dev_get_by_name(&init_net, p);
793 scope_id = dev->ifindex;
796 if (strict_strtoul(p, 10, &scope_id) == 0) {
804 sin6->sin6_scope_id = scope_id;
805 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
812 static void nfs_parse_ipv6_address(char *string, size_t str_len,
813 struct sockaddr *sap, size_t *addr_len)
815 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
816 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
819 if (str_len <= INET6_ADDRSTRLEN) {
820 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
821 (int)str_len, string);
823 sin6->sin6_family = AF_INET6;
824 *addr_len = sizeof(*sin6);
825 if (in6_pton(string, str_len, addr,
826 IPV6_SCOPE_DELIMITER, &delim) != 0) {
827 if (nfs_parse_ipv6_scope_id(string, str_len,
833 sap->sa_family = AF_UNSPEC;
837 static void nfs_parse_ipv6_address(char *string, size_t str_len,
838 struct sockaddr *sap, size_t *addr_len)
840 sap->sa_family = AF_UNSPEC;
846 * Construct a sockaddr based on the contents of a string that contains
847 * an IP address in presentation format.
849 * If there is a problem constructing the new sockaddr, set the address
850 * family to AF_UNSPEC.
852 void nfs_parse_ip_address(char *string, size_t str_len,
853 struct sockaddr *sap, size_t *addr_len)
855 unsigned int i, colons;
858 for (i = 0; i < str_len; i++)
859 if (string[i] == ':')
863 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
865 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
869 * Sanity check the NFS transport protocol.
872 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
874 switch (mnt->nfs_server.protocol) {
875 case XPRT_TRANSPORT_UDP:
876 case XPRT_TRANSPORT_TCP:
877 case XPRT_TRANSPORT_RDMA:
880 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
885 * For text based NFSv2/v3 mounts, the mount protocol transport default
886 * settings should depend upon the specified NFS transport.
888 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
890 nfs_validate_transport_protocol(mnt);
892 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
893 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
895 switch (mnt->nfs_server.protocol) {
896 case XPRT_TRANSPORT_UDP:
897 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
899 case XPRT_TRANSPORT_TCP:
900 case XPRT_TRANSPORT_RDMA:
901 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
906 * Parse the value of the 'sec=' option.
908 static int nfs_parse_security_flavors(char *value,
909 struct nfs_parsed_mount_data *mnt)
911 substring_t args[MAX_OPT_ARGS];
913 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
915 switch (match_token(value, nfs_secflavor_tokens, args)) {
917 mnt->auth_flavors[0] = RPC_AUTH_NULL;
920 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
923 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
926 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
929 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
932 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
935 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
938 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
941 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
944 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
947 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
953 mnt->auth_flavor_len = 1;
958 * Error-check and convert a string of mount options from user space into
959 * a data structure. The whole mount string is processed; bad options are
960 * skipped as they are encountered. If there were no errors, return 1;
961 * otherwise return 0 (zero).
963 static int nfs_parse_mount_options(char *raw,
964 struct nfs_parsed_mount_data *mnt)
966 char *p, *string, *secdata;
967 int rc, sloppy = 0, invalid_option = 0;
970 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
973 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
975 secdata = alloc_secdata();
979 rc = security_sb_copy_data(raw, secdata);
981 goto out_security_failure;
983 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
985 goto out_security_failure;
987 free_secdata(secdata);
989 while ((p = strsep(&raw, ",")) != NULL) {
990 substring_t args[MAX_OPT_ARGS];
991 unsigned long option;
997 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
999 token = match_token(p, nfs_mount_option_tokens, args);
1003 * boolean options: foo/nofoo
1006 mnt->flags |= NFS_MOUNT_SOFT;
1009 mnt->flags &= ~NFS_MOUNT_SOFT;
1012 mnt->flags |= NFS_MOUNT_POSIX;
1015 mnt->flags &= ~NFS_MOUNT_POSIX;
1018 mnt->flags &= ~NFS_MOUNT_NOCTO;
1021 mnt->flags |= NFS_MOUNT_NOCTO;
1024 mnt->flags &= ~NFS_MOUNT_NOAC;
1027 mnt->flags |= NFS_MOUNT_NOAC;
1030 mnt->flags &= ~NFS_MOUNT_NONLM;
1033 mnt->flags |= NFS_MOUNT_NONLM;
1036 mnt->flags &= ~NFS_MOUNT_VER3;
1039 mnt->flags |= NFS_MOUNT_VER3;
1042 mnt->flags &= ~NFS_MOUNT_TCP;
1043 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1046 mnt->flags |= NFS_MOUNT_TCP;
1047 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1050 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1051 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1052 xprt_load_transport(p);
1055 mnt->flags &= ~NFS_MOUNT_NOACL;
1058 mnt->flags |= NFS_MOUNT_NOACL;
1061 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1063 case Opt_nordirplus:
1064 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1066 case Opt_sharecache:
1067 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1069 case Opt_nosharecache:
1070 mnt->flags |= NFS_MOUNT_UNSHARED;
1073 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1075 case Opt_noresvport:
1076 mnt->flags |= NFS_MOUNT_NORESVPORT;
1079 mnt->options |= NFS_OPTION_FSCACHE;
1080 kfree(mnt->fscache_uniq);
1081 mnt->fscache_uniq = NULL;
1084 mnt->options &= ~NFS_OPTION_FSCACHE;
1085 kfree(mnt->fscache_uniq);
1086 mnt->fscache_uniq = NULL;
1088 case Opt_fscache_uniq:
1089 string = match_strdup(args);
1092 kfree(mnt->fscache_uniq);
1093 mnt->fscache_uniq = string;
1094 mnt->options |= NFS_OPTION_FSCACHE;
1098 * options that take numeric values
1101 string = match_strdup(args);
1104 rc = strict_strtoul(string, 10, &option);
1106 if (rc != 0 || option > USHORT_MAX)
1107 goto out_invalid_value;
1108 mnt->nfs_server.port = option;
1111 string = match_strdup(args);
1114 rc = strict_strtoul(string, 10, &option);
1117 goto out_invalid_value;
1118 mnt->rsize = option;
1121 string = match_strdup(args);
1124 rc = strict_strtoul(string, 10, &option);
1127 goto out_invalid_value;
1128 mnt->wsize = option;
1131 string = match_strdup(args);
1134 rc = strict_strtoul(string, 10, &option);
1137 goto out_invalid_value;
1138 mnt->bsize = option;
1141 string = match_strdup(args);
1144 rc = strict_strtoul(string, 10, &option);
1146 if (rc != 0 || option == 0)
1147 goto out_invalid_value;
1148 mnt->timeo = option;
1151 string = match_strdup(args);
1154 rc = strict_strtoul(string, 10, &option);
1156 if (rc != 0 || option == 0)
1157 goto out_invalid_value;
1158 mnt->retrans = option;
1161 string = match_strdup(args);
1164 rc = strict_strtoul(string, 10, &option);
1167 goto out_invalid_value;
1168 mnt->acregmin = option;
1171 string = match_strdup(args);
1174 rc = strict_strtoul(string, 10, &option);
1177 goto out_invalid_value;
1178 mnt->acregmax = option;
1181 string = match_strdup(args);
1184 rc = strict_strtoul(string, 10, &option);
1187 goto out_invalid_value;
1188 mnt->acdirmin = option;
1191 string = match_strdup(args);
1194 rc = strict_strtoul(string, 10, &option);
1197 goto out_invalid_value;
1198 mnt->acdirmax = option;
1201 string = match_strdup(args);
1204 rc = strict_strtoul(string, 10, &option);
1207 goto out_invalid_value;
1208 mnt->acregmin = mnt->acregmax =
1209 mnt->acdirmin = mnt->acdirmax = option;
1212 string = match_strdup(args);
1215 rc = strict_strtoul(string, 10, &option);
1218 goto out_invalid_value;
1219 mnt->namlen = option;
1222 string = match_strdup(args);
1225 rc = strict_strtoul(string, 10, &option);
1227 if (rc != 0 || option > USHORT_MAX)
1228 goto out_invalid_value;
1229 mnt->mount_server.port = option;
1232 string = match_strdup(args);
1235 rc = strict_strtoul(string, 10, &option);
1238 option < NFS_MNT_VERSION ||
1239 option > NFS_MNT3_VERSION)
1240 goto out_invalid_value;
1241 mnt->mount_server.version = option;
1244 string = match_strdup(args);
1247 rc = strict_strtoul(string, 10, &option);
1250 goto out_invalid_value;
1253 mnt->flags &= ~NFS_MOUNT_VER3;
1256 mnt->flags |= NFS_MOUNT_VER3;
1259 goto out_invalid_value;
1262 case Opt_minorversion:
1263 string = match_strdup(args);
1266 rc = strict_strtoul(string, 10, &option);
1269 goto out_invalid_value;
1270 if (option > NFS4_MAX_MINOR_VERSION)
1271 goto out_invalid_value;
1272 mnt->minorversion = option;
1276 * options that take text values
1279 string = match_strdup(args);
1282 rc = nfs_parse_security_flavors(string, mnt);
1285 dfprintk(MOUNT, "NFS: unrecognized "
1286 "security flavor\n");
1291 string = match_strdup(args);
1294 token = match_token(string,
1295 nfs_xprt_protocol_tokens, args);
1299 mnt->flags &= ~NFS_MOUNT_TCP;
1300 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1304 mnt->flags |= NFS_MOUNT_TCP;
1305 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1309 /* vector side protocols to TCP */
1310 mnt->flags |= NFS_MOUNT_TCP;
1311 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1312 xprt_load_transport(string);
1316 dfprintk(MOUNT, "NFS: unrecognized "
1317 "transport protocol\n");
1321 case Opt_mountproto:
1322 string = match_strdup(args);
1325 token = match_token(string,
1326 nfs_xprt_protocol_tokens, args);
1331 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1334 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1336 case Opt_xprt_rdma: /* not used for side protocols */
1338 dfprintk(MOUNT, "NFS: unrecognized "
1339 "transport protocol\n");
1344 string = match_strdup(args);
1347 nfs_parse_ip_address(string, strlen(string),
1349 &mnt->nfs_server.address,
1350 &mnt->nfs_server.addrlen);
1353 case Opt_clientaddr:
1354 string = match_strdup(args);
1357 kfree(mnt->client_address);
1358 mnt->client_address = string;
1361 string = match_strdup(args);
1364 kfree(mnt->mount_server.hostname);
1365 mnt->mount_server.hostname = string;
1368 string = match_strdup(args);
1371 nfs_parse_ip_address(string, strlen(string),
1373 &mnt->mount_server.address,
1374 &mnt->mount_server.addrlen);
1377 case Opt_lookupcache:
1378 string = match_strdup(args);
1381 token = match_token(string,
1382 nfs_lookupcache_tokens, args);
1385 case Opt_lookupcache_all:
1386 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1388 case Opt_lookupcache_positive:
1389 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1390 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1392 case Opt_lookupcache_none:
1393 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1396 dfprintk(MOUNT, "NFS: invalid "
1397 "lookupcache argument\n");
1407 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1410 case Opt_deprecated:
1411 dfprintk(MOUNT, "NFS: ignoring mount option "
1417 dfprintk(MOUNT, "NFS: unrecognized mount option "
1422 if (!sloppy && invalid_option)
1428 printk(KERN_INFO "NFS: bad mount option value specified: %s \n", p);
1431 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1433 out_security_failure:
1434 free_secdata(secdata);
1435 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1440 * Use the remote server's MOUNT service to request the NFS file handle
1441 * corresponding to the provided path.
1443 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1444 struct nfs_fh *root_fh)
1446 unsigned int auth_flavor_len = 0;
1447 struct nfs_mount_request request = {
1448 .sap = (struct sockaddr *)
1449 &args->mount_server.address,
1450 .dirpath = args->nfs_server.export_path,
1451 .protocol = args->mount_server.protocol,
1453 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1454 .auth_flav_len = &auth_flavor_len,
1458 if (args->mount_server.version == 0) {
1459 if (args->flags & NFS_MOUNT_VER3)
1460 args->mount_server.version = NFS_MNT3_VERSION;
1462 args->mount_server.version = NFS_MNT_VERSION;
1464 request.version = args->mount_server.version;
1466 if (args->mount_server.hostname)
1467 request.hostname = args->mount_server.hostname;
1469 request.hostname = args->nfs_server.hostname;
1472 * Construct the mount server's address.
1474 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1475 memcpy(request.sap, &args->nfs_server.address,
1476 args->nfs_server.addrlen);
1477 args->mount_server.addrlen = args->nfs_server.addrlen;
1479 request.salen = args->mount_server.addrlen;
1482 * autobind will be used if mount_server.port == 0
1484 nfs_set_port(request.sap, args->mount_server.port);
1487 * Now ask the mount server to map our export path
1490 status = nfs_mount(&request);
1494 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1495 request.hostname, status);
1499 static int nfs_parse_simple_hostname(const char *dev_name,
1500 char **hostname, size_t maxnamlen,
1501 char **export_path, size_t maxpathlen)
1504 char *colon, *comma;
1506 colon = strchr(dev_name, ':');
1508 goto out_bad_devname;
1510 len = colon - dev_name;
1511 if (len > maxnamlen)
1514 /* N.B. caller will free nfs_server.hostname in all cases */
1515 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1519 /* kill possible hostname list: not supported */
1520 comma = strchr(*hostname, ',');
1521 if (comma != NULL) {
1522 if (comma == *hostname)
1523 goto out_bad_devname;
1528 len = strlen(colon);
1529 if (len > maxpathlen)
1531 *export_path = kstrndup(colon, len, GFP_KERNEL);
1535 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1539 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1543 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1547 dfprintk(MOUNT, "NFS: server hostname too long\n");
1548 return -ENAMETOOLONG;
1551 dfprintk(MOUNT, "NFS: export pathname too long\n");
1552 return -ENAMETOOLONG;
1556 * Hostname has square brackets around it because it contains one or
1557 * more colons. We look for the first closing square bracket, and a
1558 * colon must follow it.
1560 static int nfs_parse_protected_hostname(const char *dev_name,
1561 char **hostname, size_t maxnamlen,
1562 char **export_path, size_t maxpathlen)
1567 start = (char *)(dev_name + 1);
1569 end = strchr(start, ']');
1571 goto out_bad_devname;
1572 if (*(end + 1) != ':')
1573 goto out_bad_devname;
1576 if (len > maxnamlen)
1579 /* N.B. caller will free nfs_server.hostname in all cases */
1580 *hostname = kstrndup(start, len, GFP_KERNEL);
1581 if (*hostname == NULL)
1586 if (len > maxpathlen)
1588 *export_path = kstrndup(end, len, GFP_KERNEL);
1595 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1599 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1603 dfprintk(MOUNT, "NFS: server hostname too long\n");
1604 return -ENAMETOOLONG;
1607 dfprintk(MOUNT, "NFS: export pathname too long\n");
1608 return -ENAMETOOLONG;
1612 * Split "dev_name" into "hostname:export_path".
1614 * The leftmost colon demarks the split between the server's hostname
1615 * and the export path. If the hostname starts with a left square
1616 * bracket, then it may contain colons.
1618 * Note: caller frees hostname and export path, even on error.
1620 static int nfs_parse_devname(const char *dev_name,
1621 char **hostname, size_t maxnamlen,
1622 char **export_path, size_t maxpathlen)
1624 if (*dev_name == '[')
1625 return nfs_parse_protected_hostname(dev_name,
1626 hostname, maxnamlen,
1627 export_path, maxpathlen);
1629 return nfs_parse_simple_hostname(dev_name,
1630 hostname, maxnamlen,
1631 export_path, maxpathlen);
1635 * Validate the NFS2/NFS3 mount data
1636 * - fills in the mount root filehandle
1638 * For option strings, user space handles the following behaviors:
1640 * + DNS: mapping server host name to IP address ("addr=" option)
1642 * + failure mode: how to behave if a mount request can't be handled
1643 * immediately ("fg/bg" option)
1645 * + retry: how often to retry a mount request ("retry=" option)
1647 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1648 * mountproto=tcp after mountproto=udp, and so on
1650 static int nfs_validate_mount_data(void *options,
1651 struct nfs_parsed_mount_data *args,
1652 struct nfs_fh *mntfh,
1653 const char *dev_name)
1655 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1660 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1661 args->rsize = NFS_MAX_FILE_IO_SIZE;
1662 args->wsize = NFS_MAX_FILE_IO_SIZE;
1663 args->acregmin = NFS_DEF_ACREGMIN;
1664 args->acregmax = NFS_DEF_ACREGMAX;
1665 args->acdirmin = NFS_DEF_ACDIRMIN;
1666 args->acdirmax = NFS_DEF_ACDIRMAX;
1667 args->mount_server.port = 0; /* autobind unless user sets port */
1668 args->nfs_server.port = 0; /* autobind unless user sets port */
1669 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1670 args->auth_flavors[0] = RPC_AUTH_UNIX;
1671 args->auth_flavor_len = 1;
1673 switch (data->version) {
1679 if (data->flags & NFS_MOUNT_VER3)
1681 data->root.size = NFS2_FHSIZE;
1682 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1684 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1687 memset(data->context, 0, sizeof(data->context));
1689 if (data->flags & NFS_MOUNT_VER3) {
1690 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1691 goto out_invalid_fh;
1692 mntfh->size = data->root.size;
1694 mntfh->size = NFS2_FHSIZE;
1697 memcpy(mntfh->data, data->root.data, mntfh->size);
1698 if (mntfh->size < sizeof(mntfh->data))
1699 memset(mntfh->data + mntfh->size, 0,
1700 sizeof(mntfh->data) - mntfh->size);
1703 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1706 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1707 args->rsize = data->rsize;
1708 args->wsize = data->wsize;
1709 args->timeo = data->timeo;
1710 args->retrans = data->retrans;
1711 args->acregmin = data->acregmin;
1712 args->acregmax = data->acregmax;
1713 args->acdirmin = data->acdirmin;
1714 args->acdirmax = data->acdirmax;
1716 memcpy(&args->nfs_server.address, &data->addr,
1717 sizeof(data->addr));
1718 args->nfs_server.addrlen = sizeof(data->addr);
1719 if (!nfs_verify_server_address((struct sockaddr *)
1720 &args->nfs_server.address))
1721 goto out_no_address;
1723 if (!(data->flags & NFS_MOUNT_TCP))
1724 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1725 /* N.B. caller will free nfs_server.hostname in all cases */
1726 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1727 args->namlen = data->namlen;
1728 args->bsize = data->bsize;
1730 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1731 args->auth_flavors[0] = data->pseudoflavor;
1732 if (!args->nfs_server.hostname)
1736 * The legacy version 6 binary mount data from userspace has a
1737 * field used only to transport selinux information into the
1738 * the kernel. To continue to support that functionality we
1739 * have a touch of selinux knowledge here in the NFS code. The
1740 * userspace code converted context=blah to just blah so we are
1741 * converting back to the full string selinux understands.
1743 if (data->context[0]){
1744 #ifdef CONFIG_SECURITY_SELINUX
1746 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1749 strcpy(opts_str, "context=");
1750 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1751 strcat(opts_str, &data->context[0]);
1752 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1765 if (nfs_parse_mount_options((char *)options, args) == 0)
1768 if (!nfs_verify_server_address((struct sockaddr *)
1769 &args->nfs_server.address))
1770 goto out_no_address;
1772 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1773 args->nfs_server.port);
1775 nfs_set_mount_transport_protocol(args);
1777 status = nfs_parse_devname(dev_name,
1778 &args->nfs_server.hostname,
1780 &args->nfs_server.export_path,
1783 status = nfs_try_mount(args, mntfh);
1785 kfree(args->nfs_server.export_path);
1786 args->nfs_server.export_path = NULL;
1795 #ifndef CONFIG_NFS_V3
1796 if (args->flags & NFS_MOUNT_VER3)
1797 goto out_v3_not_compiled;
1798 #endif /* !CONFIG_NFS_V3 */
1803 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1807 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1812 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1815 #ifndef CONFIG_NFS_V3
1816 out_v3_not_compiled:
1817 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1818 return -EPROTONOSUPPORT;
1819 #endif /* !CONFIG_NFS_V3 */
1822 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1826 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1830 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1835 nfs_compare_remount_data(struct nfs_server *nfss,
1836 struct nfs_parsed_mount_data *data)
1838 if (data->flags != nfss->flags ||
1839 data->rsize != nfss->rsize ||
1840 data->wsize != nfss->wsize ||
1841 data->retrans != nfss->client->cl_timeout->to_retries ||
1842 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1843 data->acregmin != nfss->acregmin / HZ ||
1844 data->acregmax != nfss->acregmax / HZ ||
1845 data->acdirmin != nfss->acdirmin / HZ ||
1846 data->acdirmax != nfss->acdirmax / HZ ||
1847 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1848 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1849 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1850 data->nfs_server.addrlen) != 0)
1857 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1860 struct nfs_server *nfss = sb->s_fs_info;
1861 struct nfs_parsed_mount_data *data;
1862 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1863 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1864 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1867 * Userspace mount programs that send binary options generally send
1868 * them populated with default values. We have no way to know which
1869 * ones were explicitly specified. Fall back to legacy behavior and
1870 * just return success.
1872 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1873 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1874 options->version <= 6))))
1877 data = kzalloc(sizeof(*data), GFP_KERNEL);
1882 /* fill out struct with values from existing mount */
1883 data->flags = nfss->flags;
1884 data->rsize = nfss->rsize;
1885 data->wsize = nfss->wsize;
1886 data->retrans = nfss->client->cl_timeout->to_retries;
1887 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1888 data->acregmin = nfss->acregmin / HZ;
1889 data->acregmax = nfss->acregmax / HZ;
1890 data->acdirmin = nfss->acdirmin / HZ;
1891 data->acdirmax = nfss->acdirmax / HZ;
1892 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1893 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1894 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1895 data->nfs_server.addrlen);
1897 /* overwrite those values with any that were specified */
1898 error = nfs_parse_mount_options((char *)options, data);
1902 /* compare new mount options with old ones */
1903 error = nfs_compare_remount_data(nfss, data);
1911 * Initialise the common bits of the superblock
1913 static inline void nfs_initialise_sb(struct super_block *sb)
1915 struct nfs_server *server = NFS_SB(sb);
1917 sb->s_magic = NFS_SUPER_MAGIC;
1919 /* We probably want something more informative here */
1920 snprintf(sb->s_id, sizeof(sb->s_id),
1921 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1923 if (sb->s_blocksize == 0)
1924 sb->s_blocksize = nfs_block_bits(server->wsize,
1925 &sb->s_blocksize_bits);
1927 if (server->flags & NFS_MOUNT_NOAC)
1928 sb->s_flags |= MS_SYNCHRONOUS;
1930 nfs_super_set_maxbytes(sb, server->maxfilesize);
1934 * Finish setting up an NFS2/3 superblock
1936 static void nfs_fill_super(struct super_block *sb,
1937 struct nfs_parsed_mount_data *data)
1939 struct nfs_server *server = NFS_SB(sb);
1941 sb->s_blocksize_bits = 0;
1942 sb->s_blocksize = 0;
1944 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1946 if (server->flags & NFS_MOUNT_VER3) {
1947 /* The VFS shouldn't apply the umask to mode bits. We will do
1948 * so ourselves when necessary.
1950 sb->s_flags |= MS_POSIXACL;
1951 sb->s_time_gran = 1;
1954 sb->s_op = &nfs_sops;
1955 nfs_initialise_sb(sb);
1959 * Finish setting up a cloned NFS2/3 superblock
1961 static void nfs_clone_super(struct super_block *sb,
1962 const struct super_block *old_sb)
1964 struct nfs_server *server = NFS_SB(sb);
1966 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1967 sb->s_blocksize = old_sb->s_blocksize;
1968 sb->s_maxbytes = old_sb->s_maxbytes;
1970 if (server->flags & NFS_MOUNT_VER3) {
1971 /* The VFS shouldn't apply the umask to mode bits. We will do
1972 * so ourselves when necessary.
1974 sb->s_flags |= MS_POSIXACL;
1975 sb->s_time_gran = 1;
1978 sb->s_op = old_sb->s_op;
1979 nfs_initialise_sb(sb);
1982 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1984 const struct nfs_server *a = s->s_fs_info;
1985 const struct rpc_clnt *clnt_a = a->client;
1986 const struct rpc_clnt *clnt_b = b->client;
1988 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1990 if (a->nfs_client != b->nfs_client)
1992 if (a->flags != b->flags)
1994 if (a->wsize != b->wsize)
1996 if (a->rsize != b->rsize)
1998 if (a->acregmin != b->acregmin)
2000 if (a->acregmax != b->acregmax)
2002 if (a->acdirmin != b->acdirmin)
2004 if (a->acdirmax != b->acdirmax)
2006 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2013 struct nfs_sb_mountdata {
2014 struct nfs_server *server;
2018 static int nfs_set_super(struct super_block *s, void *data)
2020 struct nfs_sb_mountdata *sb_mntdata = data;
2021 struct nfs_server *server = sb_mntdata->server;
2024 s->s_flags = sb_mntdata->mntflags;
2025 s->s_fs_info = server;
2026 ret = set_anon_super(s, server);
2028 server->s_dev = s->s_dev;
2032 static int nfs_compare_super_address(struct nfs_server *server1,
2033 struct nfs_server *server2)
2035 struct sockaddr *sap1, *sap2;
2037 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2038 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2040 if (sap1->sa_family != sap2->sa_family)
2043 switch (sap1->sa_family) {
2045 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2046 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2047 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2049 if (sin1->sin_port != sin2->sin_port)
2054 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2055 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2056 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2058 if (sin1->sin6_port != sin2->sin6_port)
2069 static int nfs_compare_super(struct super_block *sb, void *data)
2071 struct nfs_sb_mountdata *sb_mntdata = data;
2072 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2073 int mntflags = sb_mntdata->mntflags;
2075 if (!nfs_compare_super_address(old, server))
2077 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2078 if (old->flags & NFS_MOUNT_UNSHARED)
2080 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2082 return nfs_compare_mount_options(sb, server, mntflags);
2085 static int nfs_bdi_register(struct nfs_server *server)
2087 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2090 static int nfs_get_sb(struct file_system_type *fs_type,
2091 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2093 struct nfs_server *server = NULL;
2094 struct super_block *s;
2095 struct nfs_parsed_mount_data *data;
2096 struct nfs_fh *mntfh;
2097 struct dentry *mntroot;
2098 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2099 struct nfs_sb_mountdata sb_mntdata = {
2102 int error = -ENOMEM;
2104 data = kzalloc(sizeof(*data), GFP_KERNEL);
2105 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2106 if (data == NULL || mntfh == NULL)
2109 security_init_mnt_opts(&data->lsm_opts);
2111 /* Validate the mount data */
2112 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2116 /* Get a volume representation */
2117 server = nfs_create_server(data, mntfh);
2118 if (IS_ERR(server)) {
2119 error = PTR_ERR(server);
2122 sb_mntdata.server = server;
2124 if (server->flags & NFS_MOUNT_UNSHARED)
2125 compare_super = NULL;
2127 /* Get a superblock - note that we may end up sharing one that already exists */
2128 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2134 if (s->s_fs_info != server) {
2135 nfs_free_server(server);
2138 error = nfs_bdi_register(server);
2140 goto error_splat_super;
2144 /* initial superblock/root creation */
2145 nfs_fill_super(s, data);
2146 nfs_fscache_get_super_cookie(s, data);
2149 mntroot = nfs_get_root(s, mntfh);
2150 if (IS_ERR(mntroot)) {
2151 error = PTR_ERR(mntroot);
2152 goto error_splat_super;
2155 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2157 goto error_splat_root;
2159 s->s_flags |= MS_ACTIVE;
2161 mnt->mnt_root = mntroot;
2165 kfree(data->nfs_server.hostname);
2166 kfree(data->mount_server.hostname);
2167 kfree(data->fscache_uniq);
2168 security_free_mnt_opts(&data->lsm_opts);
2175 nfs_free_server(server);
2181 deactivate_locked_super(s);
2186 * Destroy an NFS2/3 superblock
2188 static void nfs_kill_super(struct super_block *s)
2190 struct nfs_server *server = NFS_SB(s);
2192 bdi_unregister(&server->backing_dev_info);
2194 nfs_fscache_release_super_cookie(s);
2195 nfs_free_server(server);
2199 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2201 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2202 const char *dev_name, void *raw_data,
2203 struct vfsmount *mnt)
2205 struct nfs_clone_mount *data = raw_data;
2206 struct super_block *s;
2207 struct nfs_server *server;
2208 struct dentry *mntroot;
2209 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2210 struct nfs_sb_mountdata sb_mntdata = {
2215 dprintk("--> nfs_xdev_get_sb()\n");
2217 /* create a new volume representation */
2218 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2219 if (IS_ERR(server)) {
2220 error = PTR_ERR(server);
2221 goto out_err_noserver;
2223 sb_mntdata.server = server;
2225 if (server->flags & NFS_MOUNT_UNSHARED)
2226 compare_super = NULL;
2228 /* Get a superblock - note that we may end up sharing one that already exists */
2229 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2235 if (s->s_fs_info != server) {
2236 nfs_free_server(server);
2239 error = nfs_bdi_register(server);
2241 goto error_splat_super;
2245 /* initial superblock/root creation */
2246 nfs_clone_super(s, data->sb);
2249 mntroot = nfs_get_root(s, data->fh);
2250 if (IS_ERR(mntroot)) {
2251 error = PTR_ERR(mntroot);
2252 goto error_splat_super;
2254 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2257 goto error_splat_super;
2260 s->s_flags |= MS_ACTIVE;
2262 mnt->mnt_root = mntroot;
2264 /* clone any lsm security options from the parent to the new sb */
2265 security_sb_clone_mnt_opts(data->sb, s);
2267 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2271 nfs_free_server(server);
2273 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2277 deactivate_locked_super(s);
2278 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2282 #ifdef CONFIG_NFS_V4
2285 * Finish setting up a cloned NFS4 superblock
2287 static void nfs4_clone_super(struct super_block *sb,
2288 const struct super_block *old_sb)
2290 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2291 sb->s_blocksize = old_sb->s_blocksize;
2292 sb->s_maxbytes = old_sb->s_maxbytes;
2293 sb->s_time_gran = 1;
2294 sb->s_op = old_sb->s_op;
2295 nfs_initialise_sb(sb);
2299 * Set up an NFS4 superblock
2301 static void nfs4_fill_super(struct super_block *sb)
2303 sb->s_time_gran = 1;
2304 sb->s_op = &nfs4_sops;
2305 nfs_initialise_sb(sb);
2308 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2310 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2314 * Validate NFSv4 mount options
2316 static int nfs4_validate_mount_data(void *options,
2317 struct nfs_parsed_mount_data *args,
2318 const char *dev_name)
2320 struct sockaddr_in *ap;
2321 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2327 args->rsize = NFS_MAX_FILE_IO_SIZE;
2328 args->wsize = NFS_MAX_FILE_IO_SIZE;
2329 args->acregmin = NFS_DEF_ACREGMIN;
2330 args->acregmax = NFS_DEF_ACREGMAX;
2331 args->acdirmin = NFS_DEF_ACDIRMIN;
2332 args->acdirmax = NFS_DEF_ACDIRMAX;
2333 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2334 args->auth_flavors[0] = RPC_AUTH_UNIX;
2335 args->auth_flavor_len = 1;
2336 args->minorversion = 0;
2338 switch (data->version) {
2340 ap = (struct sockaddr_in *)&args->nfs_server.address;
2341 if (data->host_addrlen > sizeof(args->nfs_server.address))
2342 goto out_no_address;
2343 if (data->host_addrlen == 0)
2344 goto out_no_address;
2345 args->nfs_server.addrlen = data->host_addrlen;
2346 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2348 if (!nfs_verify_server_address((struct sockaddr *)
2349 &args->nfs_server.address))
2350 goto out_no_address;
2352 if (data->auth_flavourlen) {
2353 if (data->auth_flavourlen > 1)
2354 goto out_inval_auth;
2355 if (copy_from_user(&args->auth_flavors[0],
2356 data->auth_flavours,
2357 sizeof(args->auth_flavors[0])))
2361 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2364 args->nfs_server.hostname = c;
2366 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2369 args->nfs_server.export_path = c;
2370 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2372 c = strndup_user(data->client_addr.data, 16);
2375 args->client_address = c;
2378 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2382 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2383 args->rsize = data->rsize;
2384 args->wsize = data->wsize;
2385 args->timeo = data->timeo;
2386 args->retrans = data->retrans;
2387 args->acregmin = data->acregmin;
2388 args->acregmax = data->acregmax;
2389 args->acdirmin = data->acdirmin;
2390 args->acdirmax = data->acdirmax;
2391 args->nfs_server.protocol = data->proto;
2392 nfs_validate_transport_protocol(args);
2398 if (nfs_parse_mount_options((char *)options, args) == 0)
2401 if (!nfs_verify_server_address((struct sockaddr *)
2402 &args->nfs_server.address))
2405 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2406 args->nfs_server.port);
2408 nfs_validate_transport_protocol(args);
2410 nfs4_validate_mount_flags(args);
2412 if (args->auth_flavor_len > 1)
2413 goto out_inval_auth;
2415 if (args->client_address == NULL)
2416 goto out_no_client_address;
2418 status = nfs_parse_devname(dev_name,
2419 &args->nfs_server.hostname,
2421 &args->nfs_server.export_path,
2433 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2437 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2438 data->auth_flavourlen);
2442 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2445 out_no_client_address:
2446 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2451 * Get the superblock for the NFS4 root partition
2453 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2454 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2456 struct nfs_parsed_mount_data *data = raw_data;
2457 struct super_block *s;
2458 struct nfs_server *server;
2459 struct nfs_fh *mntfh;
2460 struct dentry *mntroot;
2461 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2462 struct nfs_sb_mountdata sb_mntdata = {
2465 int error = -ENOMEM;
2467 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2468 if (data == NULL || mntfh == NULL)
2471 security_init_mnt_opts(&data->lsm_opts);
2473 /* Get a volume representation */
2474 server = nfs4_create_server(data, mntfh);
2475 if (IS_ERR(server)) {
2476 error = PTR_ERR(server);
2479 sb_mntdata.server = server;
2481 if (server->flags & NFS4_MOUNT_UNSHARED)
2482 compare_super = NULL;
2484 /* Get a superblock - note that we may end up sharing one that already exists */
2485 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2491 if (s->s_fs_info != server) {
2492 nfs_free_server(server);
2495 error = nfs_bdi_register(server);
2497 goto error_splat_super;
2501 /* initial superblock/root creation */
2503 nfs_fscache_get_super_cookie(s, data);
2506 mntroot = nfs4_get_root(s, mntfh);
2507 if (IS_ERR(mntroot)) {
2508 error = PTR_ERR(mntroot);
2509 goto error_splat_super;
2512 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2514 goto error_splat_root;
2516 s->s_flags |= MS_ACTIVE;
2518 mnt->mnt_root = mntroot;
2522 security_free_mnt_opts(&data->lsm_opts);
2528 nfs_free_server(server);
2534 deactivate_locked_super(s);
2538 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2539 int flags, void *data, const char *hostname)
2541 struct vfsmount *root_mnt;
2545 len = strlen(hostname) + 3;
2546 root_devname = kmalloc(len, GFP_KERNEL);
2547 if (root_devname == NULL)
2548 return ERR_PTR(-ENOMEM);
2549 snprintf(root_devname, len, "%s:/", hostname);
2550 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2551 kfree(root_devname);
2555 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2557 char *page = (char *) __get_free_page(GFP_KERNEL);
2558 char *devname, *tmp;
2562 devname = nfs_path(path->mnt->mnt_devname,
2563 path->mnt->mnt_root, path->dentry,
2565 if (devname == NULL)
2567 tmp = kstrdup(devname, GFP_KERNEL);
2570 kfree(mnt->mnt_devname);
2571 mnt->mnt_devname = tmp;
2573 free_page((unsigned long)page);
2576 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2577 const char *export_path, struct vfsmount *mnt_target)
2579 struct mnt_namespace *ns_private;
2580 struct nameidata nd;
2581 struct super_block *s;
2584 ns_private = create_mnt_ns(root_mnt);
2585 ret = PTR_ERR(ns_private);
2586 if (IS_ERR(ns_private))
2589 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2590 export_path, LOOKUP_FOLLOW, &nd);
2592 put_mnt_ns(ns_private);
2597 s = nd.path.mnt->mnt_sb;
2598 atomic_inc(&s->s_active);
2599 mnt_target->mnt_sb = s;
2600 mnt_target->mnt_root = dget(nd.path.dentry);
2602 /* Correct the device pathname */
2603 nfs_fix_devname(&nd.path, mnt_target);
2606 down_write(&s->s_umount);
2615 * Get the superblock for an NFS4 mountpoint
2617 static int nfs4_get_sb(struct file_system_type *fs_type,
2618 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2620 struct nfs_parsed_mount_data *data;
2622 struct vfsmount *root_mnt;
2623 int error = -ENOMEM;
2625 data = kzalloc(sizeof(*data), GFP_KERNEL);
2629 /* Validate the mount data */
2630 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2634 export_path = data->nfs_server.export_path;
2635 data->nfs_server.export_path = "/";
2636 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2637 data->nfs_server.hostname);
2638 data->nfs_server.export_path = export_path;
2640 error = PTR_ERR(root_mnt);
2641 if (IS_ERR(root_mnt))
2644 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2647 kfree(data->client_address);
2648 kfree(data->nfs_server.export_path);
2649 kfree(data->nfs_server.hostname);
2650 kfree(data->fscache_uniq);
2653 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2654 error != 0 ? " [error]" : "");
2658 static void nfs4_kill_super(struct super_block *sb)
2660 struct nfs_server *server = NFS_SB(sb);
2662 dprintk("--> %s\n", __func__);
2663 nfs_super_return_all_delegations(sb);
2664 kill_anon_super(sb);
2665 nfs4_renewd_prepare_shutdown(server);
2666 nfs_fscache_release_super_cookie(sb);
2667 nfs_free_server(server);
2668 dprintk("<-- %s\n", __func__);
2672 * Clone an NFS4 server record on xdev traversal (FSID-change)
2674 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2675 const char *dev_name, void *raw_data,
2676 struct vfsmount *mnt)
2678 struct nfs_clone_mount *data = raw_data;
2679 struct super_block *s;
2680 struct nfs_server *server;
2681 struct dentry *mntroot;
2682 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2683 struct nfs_sb_mountdata sb_mntdata = {
2688 dprintk("--> nfs4_xdev_get_sb()\n");
2690 /* create a new volume representation */
2691 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2692 if (IS_ERR(server)) {
2693 error = PTR_ERR(server);
2694 goto out_err_noserver;
2696 sb_mntdata.server = server;
2698 if (server->flags & NFS4_MOUNT_UNSHARED)
2699 compare_super = NULL;
2701 /* Get a superblock - note that we may end up sharing one that already exists */
2702 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2708 if (s->s_fs_info != server) {
2709 nfs_free_server(server);
2712 error = nfs_bdi_register(server);
2714 goto error_splat_super;
2718 /* initial superblock/root creation */
2719 nfs4_clone_super(s, data->sb);
2722 mntroot = nfs4_get_root(s, data->fh);
2723 if (IS_ERR(mntroot)) {
2724 error = PTR_ERR(mntroot);
2725 goto error_splat_super;
2727 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2730 goto error_splat_super;
2733 s->s_flags |= MS_ACTIVE;
2735 mnt->mnt_root = mntroot;
2737 security_sb_clone_mnt_opts(data->sb, s);
2739 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2743 nfs_free_server(server);
2745 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2749 deactivate_locked_super(s);
2750 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2754 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2755 int flags, const char *dev_name, void *raw_data,
2756 struct vfsmount *mnt)
2758 struct nfs_clone_mount *data = raw_data;
2759 struct super_block *s;
2760 struct nfs_server *server;
2761 struct dentry *mntroot;
2762 struct nfs_fh mntfh;
2763 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2764 struct nfs_sb_mountdata sb_mntdata = {
2769 dprintk("--> nfs4_referral_get_sb()\n");
2771 /* create a new volume representation */
2772 server = nfs4_create_referral_server(data, &mntfh);
2773 if (IS_ERR(server)) {
2774 error = PTR_ERR(server);
2775 goto out_err_noserver;
2777 sb_mntdata.server = server;
2779 if (server->flags & NFS4_MOUNT_UNSHARED)
2780 compare_super = NULL;
2782 /* Get a superblock - note that we may end up sharing one that already exists */
2783 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2789 if (s->s_fs_info != server) {
2790 nfs_free_server(server);
2793 error = nfs_bdi_register(server);
2795 goto error_splat_super;
2799 /* initial superblock/root creation */
2803 mntroot = nfs4_get_root(s, &mntfh);
2804 if (IS_ERR(mntroot)) {
2805 error = PTR_ERR(mntroot);
2806 goto error_splat_super;
2808 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2811 goto error_splat_super;
2814 s->s_flags |= MS_ACTIVE;
2816 mnt->mnt_root = mntroot;
2818 security_sb_clone_mnt_opts(data->sb, s);
2820 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2824 nfs_free_server(server);
2826 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2830 deactivate_locked_super(s);
2831 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2836 * Create an NFS4 server record on referral traversal
2838 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2839 int flags, const char *dev_name, void *raw_data,
2840 struct vfsmount *mnt)
2842 struct nfs_clone_mount *data = raw_data;
2844 struct vfsmount *root_mnt;
2847 dprintk("--> nfs4_referral_get_sb()\n");
2849 export_path = data->mnt_path;
2850 data->mnt_path = "/";
2852 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2853 flags, data, data->hostname);
2854 data->mnt_path = export_path;
2856 error = PTR_ERR(root_mnt);
2857 if (IS_ERR(root_mnt))
2860 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2862 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2863 error != 0 ? " [error]" : "");
2867 #endif /* CONFIG_NFS_V4 */