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);
745 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
750 * Sanity check the NFS transport protocol.
753 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
755 switch (mnt->nfs_server.protocol) {
756 case XPRT_TRANSPORT_UDP:
757 case XPRT_TRANSPORT_TCP:
758 case XPRT_TRANSPORT_RDMA:
761 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
766 * For text based NFSv2/v3 mounts, the mount protocol transport default
767 * settings should depend upon the specified NFS transport.
769 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
771 nfs_validate_transport_protocol(mnt);
773 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
774 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
776 switch (mnt->nfs_server.protocol) {
777 case XPRT_TRANSPORT_UDP:
778 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
780 case XPRT_TRANSPORT_TCP:
781 case XPRT_TRANSPORT_RDMA:
782 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
787 * Parse the value of the 'sec=' option.
789 static int nfs_parse_security_flavors(char *value,
790 struct nfs_parsed_mount_data *mnt)
792 substring_t args[MAX_OPT_ARGS];
794 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
796 switch (match_token(value, nfs_secflavor_tokens, args)) {
798 mnt->auth_flavors[0] = RPC_AUTH_NULL;
801 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
804 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
807 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
810 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
813 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
816 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
819 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
822 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
825 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
828 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
834 mnt->auth_flavor_len = 1;
839 * Error-check and convert a string of mount options from user space into
840 * a data structure. The whole mount string is processed; bad options are
841 * skipped as they are encountered. If there were no errors, return 1;
842 * otherwise return 0 (zero).
844 static int nfs_parse_mount_options(char *raw,
845 struct nfs_parsed_mount_data *mnt)
847 char *p, *string, *secdata;
848 int rc, sloppy = 0, invalid_option = 0;
851 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
854 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
856 secdata = alloc_secdata();
860 rc = security_sb_copy_data(raw, secdata);
862 goto out_security_failure;
864 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
866 goto out_security_failure;
868 free_secdata(secdata);
870 while ((p = strsep(&raw, ",")) != NULL) {
871 substring_t args[MAX_OPT_ARGS];
872 unsigned long option;
878 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
880 token = match_token(p, nfs_mount_option_tokens, args);
884 * boolean options: foo/nofoo
887 mnt->flags |= NFS_MOUNT_SOFT;
890 mnt->flags &= ~NFS_MOUNT_SOFT;
893 mnt->flags |= NFS_MOUNT_POSIX;
896 mnt->flags &= ~NFS_MOUNT_POSIX;
899 mnt->flags &= ~NFS_MOUNT_NOCTO;
902 mnt->flags |= NFS_MOUNT_NOCTO;
905 mnt->flags &= ~NFS_MOUNT_NOAC;
908 mnt->flags |= NFS_MOUNT_NOAC;
911 mnt->flags &= ~NFS_MOUNT_NONLM;
914 mnt->flags |= NFS_MOUNT_NONLM;
917 mnt->flags &= ~NFS_MOUNT_VER3;
920 mnt->flags |= NFS_MOUNT_VER3;
923 mnt->flags &= ~NFS_MOUNT_TCP;
924 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
927 mnt->flags |= NFS_MOUNT_TCP;
928 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
931 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
932 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
933 xprt_load_transport(p);
936 mnt->flags &= ~NFS_MOUNT_NOACL;
939 mnt->flags |= NFS_MOUNT_NOACL;
942 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
945 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
948 mnt->flags &= ~NFS_MOUNT_UNSHARED;
950 case Opt_nosharecache:
951 mnt->flags |= NFS_MOUNT_UNSHARED;
954 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
957 mnt->flags |= NFS_MOUNT_NORESVPORT;
960 mnt->options |= NFS_OPTION_FSCACHE;
961 kfree(mnt->fscache_uniq);
962 mnt->fscache_uniq = NULL;
965 mnt->options &= ~NFS_OPTION_FSCACHE;
966 kfree(mnt->fscache_uniq);
967 mnt->fscache_uniq = NULL;
969 case Opt_fscache_uniq:
970 string = match_strdup(args);
973 kfree(mnt->fscache_uniq);
974 mnt->fscache_uniq = string;
975 mnt->options |= NFS_OPTION_FSCACHE;
979 * options that take numeric values
982 string = match_strdup(args);
985 rc = strict_strtoul(string, 10, &option);
987 if (rc != 0 || option > USHORT_MAX)
988 goto out_invalid_value;
989 mnt->nfs_server.port = option;
992 string = match_strdup(args);
995 rc = strict_strtoul(string, 10, &option);
998 goto out_invalid_value;
1002 string = match_strdup(args);
1005 rc = strict_strtoul(string, 10, &option);
1008 goto out_invalid_value;
1009 mnt->wsize = option;
1012 string = match_strdup(args);
1015 rc = strict_strtoul(string, 10, &option);
1018 goto out_invalid_value;
1019 mnt->bsize = option;
1022 string = match_strdup(args);
1025 rc = strict_strtoul(string, 10, &option);
1027 if (rc != 0 || option == 0)
1028 goto out_invalid_value;
1029 mnt->timeo = option;
1032 string = match_strdup(args);
1035 rc = strict_strtoul(string, 10, &option);
1037 if (rc != 0 || option == 0)
1038 goto out_invalid_value;
1039 mnt->retrans = option;
1042 string = match_strdup(args);
1045 rc = strict_strtoul(string, 10, &option);
1048 goto out_invalid_value;
1049 mnt->acregmin = option;
1052 string = match_strdup(args);
1055 rc = strict_strtoul(string, 10, &option);
1058 goto out_invalid_value;
1059 mnt->acregmax = option;
1062 string = match_strdup(args);
1065 rc = strict_strtoul(string, 10, &option);
1068 goto out_invalid_value;
1069 mnt->acdirmin = option;
1072 string = match_strdup(args);
1075 rc = strict_strtoul(string, 10, &option);
1078 goto out_invalid_value;
1079 mnt->acdirmax = option;
1082 string = match_strdup(args);
1085 rc = strict_strtoul(string, 10, &option);
1088 goto out_invalid_value;
1089 mnt->acregmin = mnt->acregmax =
1090 mnt->acdirmin = mnt->acdirmax = option;
1093 string = match_strdup(args);
1096 rc = strict_strtoul(string, 10, &option);
1099 goto out_invalid_value;
1100 mnt->namlen = option;
1103 string = match_strdup(args);
1106 rc = strict_strtoul(string, 10, &option);
1108 if (rc != 0 || option > USHORT_MAX)
1109 goto out_invalid_value;
1110 mnt->mount_server.port = option;
1113 string = match_strdup(args);
1116 rc = strict_strtoul(string, 10, &option);
1119 option < NFS_MNT_VERSION ||
1120 option > NFS_MNT3_VERSION)
1121 goto out_invalid_value;
1122 mnt->mount_server.version = option;
1125 string = match_strdup(args);
1128 rc = strict_strtoul(string, 10, &option);
1131 goto out_invalid_value;
1134 mnt->flags &= ~NFS_MOUNT_VER3;
1137 mnt->flags |= NFS_MOUNT_VER3;
1140 goto out_invalid_value;
1143 case Opt_minorversion:
1144 string = match_strdup(args);
1147 rc = strict_strtoul(string, 10, &option);
1150 goto out_invalid_value;
1151 if (option > NFS4_MAX_MINOR_VERSION)
1152 goto out_invalid_value;
1153 mnt->minorversion = option;
1157 * options that take text values
1160 string = match_strdup(args);
1163 rc = nfs_parse_security_flavors(string, mnt);
1166 dfprintk(MOUNT, "NFS: unrecognized "
1167 "security flavor\n");
1172 string = match_strdup(args);
1175 token = match_token(string,
1176 nfs_xprt_protocol_tokens, args);
1180 mnt->flags &= ~NFS_MOUNT_TCP;
1181 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1185 mnt->flags |= NFS_MOUNT_TCP;
1186 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1190 /* vector side protocols to TCP */
1191 mnt->flags |= NFS_MOUNT_TCP;
1192 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1193 xprt_load_transport(string);
1197 dfprintk(MOUNT, "NFS: unrecognized "
1198 "transport protocol\n");
1202 case Opt_mountproto:
1203 string = match_strdup(args);
1206 token = match_token(string,
1207 nfs_xprt_protocol_tokens, args);
1212 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1215 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1217 case Opt_xprt_rdma: /* not used for side protocols */
1219 dfprintk(MOUNT, "NFS: unrecognized "
1220 "transport protocol\n");
1225 string = match_strdup(args);
1228 mnt->nfs_server.addrlen =
1229 rpc_pton(string, strlen(string),
1231 &mnt->nfs_server.address,
1232 sizeof(mnt->nfs_server.address));
1234 if (mnt->nfs_server.addrlen == 0)
1235 goto out_invalid_address;
1237 case Opt_clientaddr:
1238 string = match_strdup(args);
1241 kfree(mnt->client_address);
1242 mnt->client_address = string;
1245 string = match_strdup(args);
1248 kfree(mnt->mount_server.hostname);
1249 mnt->mount_server.hostname = string;
1252 string = match_strdup(args);
1255 mnt->mount_server.addrlen =
1256 rpc_pton(string, strlen(string),
1258 &mnt->mount_server.address,
1259 sizeof(mnt->mount_server.address));
1261 if (mnt->mount_server.addrlen == 0)
1262 goto out_invalid_address;
1264 case Opt_lookupcache:
1265 string = match_strdup(args);
1268 token = match_token(string,
1269 nfs_lookupcache_tokens, args);
1272 case Opt_lookupcache_all:
1273 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1275 case Opt_lookupcache_positive:
1276 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1277 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1279 case Opt_lookupcache_none:
1280 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1283 dfprintk(MOUNT, "NFS: invalid "
1284 "lookupcache argument\n");
1294 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1297 case Opt_deprecated:
1298 dfprintk(MOUNT, "NFS: ignoring mount option "
1304 dfprintk(MOUNT, "NFS: unrecognized mount option "
1309 if (!sloppy && invalid_option)
1314 out_invalid_address:
1315 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1318 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1321 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1323 out_security_failure:
1324 free_secdata(secdata);
1325 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1330 * Match the requested auth flavors with the list returned by
1331 * the server. Returns zero and sets the mount's authentication
1332 * flavor on success; returns -EACCES if server does not support
1333 * the requested flavor.
1335 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1336 struct nfs_mount_request *request)
1338 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1341 * We avoid sophisticated negotiating here, as there are
1342 * plenty of cases where we can get it wrong, providing
1343 * either too little or too much security.
1345 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1346 * flavor listed first. However, some servers list
1347 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1348 * preferred default, in args->auth_flavors[0] if user
1349 * didn't specify sec= mount option.
1351 for (i = 0; i < args->auth_flavor_len; i++)
1352 for (j = 0; j < server_authlist_len; j++)
1353 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1354 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1355 request->auth_flavs[j]);
1356 args->auth_flavors[0] = request->auth_flavs[j];
1360 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1361 nfs_umount(request);
1366 * Use the remote server's MOUNT service to request the NFS file handle
1367 * corresponding to the provided path.
1369 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1370 struct nfs_fh *root_fh)
1372 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1373 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1374 struct nfs_mount_request request = {
1375 .sap = (struct sockaddr *)
1376 &args->mount_server.address,
1377 .dirpath = args->nfs_server.export_path,
1378 .protocol = args->mount_server.protocol,
1380 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1381 .auth_flav_len = &server_authlist_len,
1382 .auth_flavs = server_authlist,
1386 if (args->mount_server.version == 0) {
1387 if (args->flags & NFS_MOUNT_VER3)
1388 args->mount_server.version = NFS_MNT3_VERSION;
1390 args->mount_server.version = NFS_MNT_VERSION;
1392 request.version = args->mount_server.version;
1394 if (args->mount_server.hostname)
1395 request.hostname = args->mount_server.hostname;
1397 request.hostname = args->nfs_server.hostname;
1400 * Construct the mount server's address.
1402 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1403 memcpy(request.sap, &args->nfs_server.address,
1404 args->nfs_server.addrlen);
1405 args->mount_server.addrlen = args->nfs_server.addrlen;
1407 request.salen = args->mount_server.addrlen;
1410 * autobind will be used if mount_server.port == 0
1412 nfs_set_port(request.sap, args->mount_server.port);
1415 * Now ask the mount server to map our export path
1418 status = nfs_mount(&request);
1420 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1421 request.hostname, status);
1426 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1428 if (args->mount_server.version != NFS_MNT3_VERSION)
1430 return nfs_walk_authlist(args, &request);
1433 static int nfs_parse_simple_hostname(const char *dev_name,
1434 char **hostname, size_t maxnamlen,
1435 char **export_path, size_t maxpathlen)
1438 char *colon, *comma;
1440 colon = strchr(dev_name, ':');
1442 goto out_bad_devname;
1444 len = colon - dev_name;
1445 if (len > maxnamlen)
1448 /* N.B. caller will free nfs_server.hostname in all cases */
1449 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1453 /* kill possible hostname list: not supported */
1454 comma = strchr(*hostname, ',');
1455 if (comma != NULL) {
1456 if (comma == *hostname)
1457 goto out_bad_devname;
1462 len = strlen(colon);
1463 if (len > maxpathlen)
1465 *export_path = kstrndup(colon, len, GFP_KERNEL);
1469 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1473 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1477 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1481 dfprintk(MOUNT, "NFS: server hostname too long\n");
1482 return -ENAMETOOLONG;
1485 dfprintk(MOUNT, "NFS: export pathname too long\n");
1486 return -ENAMETOOLONG;
1490 * Hostname has square brackets around it because it contains one or
1491 * more colons. We look for the first closing square bracket, and a
1492 * colon must follow it.
1494 static int nfs_parse_protected_hostname(const char *dev_name,
1495 char **hostname, size_t maxnamlen,
1496 char **export_path, size_t maxpathlen)
1501 start = (char *)(dev_name + 1);
1503 end = strchr(start, ']');
1505 goto out_bad_devname;
1506 if (*(end + 1) != ':')
1507 goto out_bad_devname;
1510 if (len > maxnamlen)
1513 /* N.B. caller will free nfs_server.hostname in all cases */
1514 *hostname = kstrndup(start, len, GFP_KERNEL);
1515 if (*hostname == NULL)
1520 if (len > maxpathlen)
1522 *export_path = kstrndup(end, len, GFP_KERNEL);
1529 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1533 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1537 dfprintk(MOUNT, "NFS: server hostname too long\n");
1538 return -ENAMETOOLONG;
1541 dfprintk(MOUNT, "NFS: export pathname too long\n");
1542 return -ENAMETOOLONG;
1546 * Split "dev_name" into "hostname:export_path".
1548 * The leftmost colon demarks the split between the server's hostname
1549 * and the export path. If the hostname starts with a left square
1550 * bracket, then it may contain colons.
1552 * Note: caller frees hostname and export path, even on error.
1554 static int nfs_parse_devname(const char *dev_name,
1555 char **hostname, size_t maxnamlen,
1556 char **export_path, size_t maxpathlen)
1558 if (*dev_name == '[')
1559 return nfs_parse_protected_hostname(dev_name,
1560 hostname, maxnamlen,
1561 export_path, maxpathlen);
1563 return nfs_parse_simple_hostname(dev_name,
1564 hostname, maxnamlen,
1565 export_path, maxpathlen);
1569 * Validate the NFS2/NFS3 mount data
1570 * - fills in the mount root filehandle
1572 * For option strings, user space handles the following behaviors:
1574 * + DNS: mapping server host name to IP address ("addr=" option)
1576 * + failure mode: how to behave if a mount request can't be handled
1577 * immediately ("fg/bg" option)
1579 * + retry: how often to retry a mount request ("retry=" option)
1581 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1582 * mountproto=tcp after mountproto=udp, and so on
1584 static int nfs_validate_mount_data(void *options,
1585 struct nfs_parsed_mount_data *args,
1586 struct nfs_fh *mntfh,
1587 const char *dev_name)
1589 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1594 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1595 args->rsize = NFS_MAX_FILE_IO_SIZE;
1596 args->wsize = NFS_MAX_FILE_IO_SIZE;
1597 args->acregmin = NFS_DEF_ACREGMIN;
1598 args->acregmax = NFS_DEF_ACREGMAX;
1599 args->acdirmin = NFS_DEF_ACDIRMIN;
1600 args->acdirmax = NFS_DEF_ACDIRMAX;
1601 args->mount_server.port = 0; /* autobind unless user sets port */
1602 args->nfs_server.port = 0; /* autobind unless user sets port */
1603 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1604 args->auth_flavors[0] = RPC_AUTH_UNIX;
1605 args->auth_flavor_len = 1;
1607 switch (data->version) {
1613 if (data->flags & NFS_MOUNT_VER3)
1615 data->root.size = NFS2_FHSIZE;
1616 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1618 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1621 memset(data->context, 0, sizeof(data->context));
1623 if (data->flags & NFS_MOUNT_VER3) {
1624 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1625 goto out_invalid_fh;
1626 mntfh->size = data->root.size;
1628 mntfh->size = NFS2_FHSIZE;
1631 memcpy(mntfh->data, data->root.data, mntfh->size);
1632 if (mntfh->size < sizeof(mntfh->data))
1633 memset(mntfh->data + mntfh->size, 0,
1634 sizeof(mntfh->data) - mntfh->size);
1637 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1640 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1641 args->rsize = data->rsize;
1642 args->wsize = data->wsize;
1643 args->timeo = data->timeo;
1644 args->retrans = data->retrans;
1645 args->acregmin = data->acregmin;
1646 args->acregmax = data->acregmax;
1647 args->acdirmin = data->acdirmin;
1648 args->acdirmax = data->acdirmax;
1650 memcpy(&args->nfs_server.address, &data->addr,
1651 sizeof(data->addr));
1652 args->nfs_server.addrlen = sizeof(data->addr);
1653 if (!nfs_verify_server_address((struct sockaddr *)
1654 &args->nfs_server.address))
1655 goto out_no_address;
1657 if (!(data->flags & NFS_MOUNT_TCP))
1658 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1659 /* N.B. caller will free nfs_server.hostname in all cases */
1660 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1661 args->namlen = data->namlen;
1662 args->bsize = data->bsize;
1664 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1665 args->auth_flavors[0] = data->pseudoflavor;
1666 if (!args->nfs_server.hostname)
1670 * The legacy version 6 binary mount data from userspace has a
1671 * field used only to transport selinux information into the
1672 * the kernel. To continue to support that functionality we
1673 * have a touch of selinux knowledge here in the NFS code. The
1674 * userspace code converted context=blah to just blah so we are
1675 * converting back to the full string selinux understands.
1677 if (data->context[0]){
1678 #ifdef CONFIG_SECURITY_SELINUX
1680 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1683 strcpy(opts_str, "context=");
1684 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1685 strcat(opts_str, &data->context[0]);
1686 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1699 if (nfs_parse_mount_options((char *)options, args) == 0)
1702 if (!nfs_verify_server_address((struct sockaddr *)
1703 &args->nfs_server.address))
1704 goto out_no_address;
1706 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1707 args->nfs_server.port);
1709 nfs_set_mount_transport_protocol(args);
1711 status = nfs_parse_devname(dev_name,
1712 &args->nfs_server.hostname,
1714 &args->nfs_server.export_path,
1717 status = nfs_try_mount(args, mntfh);
1719 kfree(args->nfs_server.export_path);
1720 args->nfs_server.export_path = NULL;
1729 #ifndef CONFIG_NFS_V3
1730 if (args->flags & NFS_MOUNT_VER3)
1731 goto out_v3_not_compiled;
1732 #endif /* !CONFIG_NFS_V3 */
1737 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1741 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1746 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1749 #ifndef CONFIG_NFS_V3
1750 out_v3_not_compiled:
1751 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1752 return -EPROTONOSUPPORT;
1753 #endif /* !CONFIG_NFS_V3 */
1756 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1760 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1764 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1769 nfs_compare_remount_data(struct nfs_server *nfss,
1770 struct nfs_parsed_mount_data *data)
1772 if (data->flags != nfss->flags ||
1773 data->rsize != nfss->rsize ||
1774 data->wsize != nfss->wsize ||
1775 data->retrans != nfss->client->cl_timeout->to_retries ||
1776 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1777 data->acregmin != nfss->acregmin / HZ ||
1778 data->acregmax != nfss->acregmax / HZ ||
1779 data->acdirmin != nfss->acdirmin / HZ ||
1780 data->acdirmax != nfss->acdirmax / HZ ||
1781 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1782 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1783 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1784 data->nfs_server.addrlen) != 0)
1791 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1794 struct nfs_server *nfss = sb->s_fs_info;
1795 struct nfs_parsed_mount_data *data;
1796 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1797 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1798 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1801 * Userspace mount programs that send binary options generally send
1802 * them populated with default values. We have no way to know which
1803 * ones were explicitly specified. Fall back to legacy behavior and
1804 * just return success.
1806 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1807 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1808 options->version <= 6))))
1811 data = kzalloc(sizeof(*data), GFP_KERNEL);
1816 /* fill out struct with values from existing mount */
1817 data->flags = nfss->flags;
1818 data->rsize = nfss->rsize;
1819 data->wsize = nfss->wsize;
1820 data->retrans = nfss->client->cl_timeout->to_retries;
1821 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1822 data->acregmin = nfss->acregmin / HZ;
1823 data->acregmax = nfss->acregmax / HZ;
1824 data->acdirmin = nfss->acdirmin / HZ;
1825 data->acdirmax = nfss->acdirmax / HZ;
1826 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1827 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1828 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1829 data->nfs_server.addrlen);
1831 /* overwrite those values with any that were specified */
1832 error = nfs_parse_mount_options((char *)options, data);
1836 /* compare new mount options with old ones */
1837 error = nfs_compare_remount_data(nfss, data);
1845 * Initialise the common bits of the superblock
1847 static inline void nfs_initialise_sb(struct super_block *sb)
1849 struct nfs_server *server = NFS_SB(sb);
1851 sb->s_magic = NFS_SUPER_MAGIC;
1853 /* We probably want something more informative here */
1854 snprintf(sb->s_id, sizeof(sb->s_id),
1855 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1857 if (sb->s_blocksize == 0)
1858 sb->s_blocksize = nfs_block_bits(server->wsize,
1859 &sb->s_blocksize_bits);
1861 if (server->flags & NFS_MOUNT_NOAC)
1862 sb->s_flags |= MS_SYNCHRONOUS;
1864 nfs_super_set_maxbytes(sb, server->maxfilesize);
1868 * Finish setting up an NFS2/3 superblock
1870 static void nfs_fill_super(struct super_block *sb,
1871 struct nfs_parsed_mount_data *data)
1873 struct nfs_server *server = NFS_SB(sb);
1875 sb->s_blocksize_bits = 0;
1876 sb->s_blocksize = 0;
1878 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1880 if (server->flags & NFS_MOUNT_VER3) {
1881 /* The VFS shouldn't apply the umask to mode bits. We will do
1882 * so ourselves when necessary.
1884 sb->s_flags |= MS_POSIXACL;
1885 sb->s_time_gran = 1;
1888 sb->s_op = &nfs_sops;
1889 nfs_initialise_sb(sb);
1893 * Finish setting up a cloned NFS2/3 superblock
1895 static void nfs_clone_super(struct super_block *sb,
1896 const struct super_block *old_sb)
1898 struct nfs_server *server = NFS_SB(sb);
1900 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1901 sb->s_blocksize = old_sb->s_blocksize;
1902 sb->s_maxbytes = old_sb->s_maxbytes;
1904 if (server->flags & NFS_MOUNT_VER3) {
1905 /* The VFS shouldn't apply the umask to mode bits. We will do
1906 * so ourselves when necessary.
1908 sb->s_flags |= MS_POSIXACL;
1909 sb->s_time_gran = 1;
1912 sb->s_op = old_sb->s_op;
1913 nfs_initialise_sb(sb);
1916 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1918 const struct nfs_server *a = s->s_fs_info;
1919 const struct rpc_clnt *clnt_a = a->client;
1920 const struct rpc_clnt *clnt_b = b->client;
1922 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1924 if (a->nfs_client != b->nfs_client)
1926 if (a->flags != b->flags)
1928 if (a->wsize != b->wsize)
1930 if (a->rsize != b->rsize)
1932 if (a->acregmin != b->acregmin)
1934 if (a->acregmax != b->acregmax)
1936 if (a->acdirmin != b->acdirmin)
1938 if (a->acdirmax != b->acdirmax)
1940 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1947 struct nfs_sb_mountdata {
1948 struct nfs_server *server;
1952 static int nfs_set_super(struct super_block *s, void *data)
1954 struct nfs_sb_mountdata *sb_mntdata = data;
1955 struct nfs_server *server = sb_mntdata->server;
1958 s->s_flags = sb_mntdata->mntflags;
1959 s->s_fs_info = server;
1960 ret = set_anon_super(s, server);
1962 server->s_dev = s->s_dev;
1966 static int nfs_compare_super_address(struct nfs_server *server1,
1967 struct nfs_server *server2)
1969 struct sockaddr *sap1, *sap2;
1971 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1972 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1974 if (sap1->sa_family != sap2->sa_family)
1977 switch (sap1->sa_family) {
1979 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1980 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1981 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1983 if (sin1->sin_port != sin2->sin_port)
1988 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1989 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1990 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1992 if (sin1->sin6_port != sin2->sin6_port)
2003 static int nfs_compare_super(struct super_block *sb, void *data)
2005 struct nfs_sb_mountdata *sb_mntdata = data;
2006 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2007 int mntflags = sb_mntdata->mntflags;
2009 if (!nfs_compare_super_address(old, server))
2011 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2012 if (old->flags & NFS_MOUNT_UNSHARED)
2014 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2016 return nfs_compare_mount_options(sb, server, mntflags);
2019 static int nfs_bdi_register(struct nfs_server *server)
2021 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2024 static int nfs_get_sb(struct file_system_type *fs_type,
2025 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2027 struct nfs_server *server = NULL;
2028 struct super_block *s;
2029 struct nfs_parsed_mount_data *data;
2030 struct nfs_fh *mntfh;
2031 struct dentry *mntroot;
2032 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2033 struct nfs_sb_mountdata sb_mntdata = {
2036 int error = -ENOMEM;
2038 data = kzalloc(sizeof(*data), GFP_KERNEL);
2039 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2040 if (data == NULL || mntfh == NULL)
2043 security_init_mnt_opts(&data->lsm_opts);
2045 /* Validate the mount data */
2046 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2050 /* Get a volume representation */
2051 server = nfs_create_server(data, mntfh);
2052 if (IS_ERR(server)) {
2053 error = PTR_ERR(server);
2056 sb_mntdata.server = server;
2058 if (server->flags & NFS_MOUNT_UNSHARED)
2059 compare_super = NULL;
2061 /* Get a superblock - note that we may end up sharing one that already exists */
2062 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2068 if (s->s_fs_info != server) {
2069 nfs_free_server(server);
2072 error = nfs_bdi_register(server);
2074 goto error_splat_super;
2078 /* initial superblock/root creation */
2079 nfs_fill_super(s, data);
2080 nfs_fscache_get_super_cookie(s, data);
2083 mntroot = nfs_get_root(s, mntfh);
2084 if (IS_ERR(mntroot)) {
2085 error = PTR_ERR(mntroot);
2086 goto error_splat_super;
2089 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2091 goto error_splat_root;
2093 s->s_flags |= MS_ACTIVE;
2095 mnt->mnt_root = mntroot;
2099 kfree(data->nfs_server.hostname);
2100 kfree(data->mount_server.hostname);
2101 kfree(data->fscache_uniq);
2102 security_free_mnt_opts(&data->lsm_opts);
2109 nfs_free_server(server);
2115 deactivate_locked_super(s);
2120 * Destroy an NFS2/3 superblock
2122 static void nfs_kill_super(struct super_block *s)
2124 struct nfs_server *server = NFS_SB(s);
2126 bdi_unregister(&server->backing_dev_info);
2128 nfs_fscache_release_super_cookie(s);
2129 nfs_free_server(server);
2133 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2135 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2136 const char *dev_name, void *raw_data,
2137 struct vfsmount *mnt)
2139 struct nfs_clone_mount *data = raw_data;
2140 struct super_block *s;
2141 struct nfs_server *server;
2142 struct dentry *mntroot;
2143 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2144 struct nfs_sb_mountdata sb_mntdata = {
2149 dprintk("--> nfs_xdev_get_sb()\n");
2151 /* create a new volume representation */
2152 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2153 if (IS_ERR(server)) {
2154 error = PTR_ERR(server);
2155 goto out_err_noserver;
2157 sb_mntdata.server = server;
2159 if (server->flags & NFS_MOUNT_UNSHARED)
2160 compare_super = NULL;
2162 /* Get a superblock - note that we may end up sharing one that already exists */
2163 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2169 if (s->s_fs_info != server) {
2170 nfs_free_server(server);
2173 error = nfs_bdi_register(server);
2175 goto error_splat_super;
2179 /* initial superblock/root creation */
2180 nfs_clone_super(s, data->sb);
2183 mntroot = nfs_get_root(s, data->fh);
2184 if (IS_ERR(mntroot)) {
2185 error = PTR_ERR(mntroot);
2186 goto error_splat_super;
2188 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2191 goto error_splat_super;
2194 s->s_flags |= MS_ACTIVE;
2196 mnt->mnt_root = mntroot;
2198 /* clone any lsm security options from the parent to the new sb */
2199 security_sb_clone_mnt_opts(data->sb, s);
2201 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2205 nfs_free_server(server);
2207 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2211 deactivate_locked_super(s);
2212 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2216 #ifdef CONFIG_NFS_V4
2219 * Finish setting up a cloned NFS4 superblock
2221 static void nfs4_clone_super(struct super_block *sb,
2222 const struct super_block *old_sb)
2224 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2225 sb->s_blocksize = old_sb->s_blocksize;
2226 sb->s_maxbytes = old_sb->s_maxbytes;
2227 sb->s_time_gran = 1;
2228 sb->s_op = old_sb->s_op;
2229 nfs_initialise_sb(sb);
2233 * Set up an NFS4 superblock
2235 static void nfs4_fill_super(struct super_block *sb)
2237 sb->s_time_gran = 1;
2238 sb->s_op = &nfs4_sops;
2239 nfs_initialise_sb(sb);
2242 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2244 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2248 * Validate NFSv4 mount options
2250 static int nfs4_validate_mount_data(void *options,
2251 struct nfs_parsed_mount_data *args,
2252 const char *dev_name)
2254 struct sockaddr_in *ap;
2255 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2261 args->rsize = NFS_MAX_FILE_IO_SIZE;
2262 args->wsize = NFS_MAX_FILE_IO_SIZE;
2263 args->acregmin = NFS_DEF_ACREGMIN;
2264 args->acregmax = NFS_DEF_ACREGMAX;
2265 args->acdirmin = NFS_DEF_ACDIRMIN;
2266 args->acdirmax = NFS_DEF_ACDIRMAX;
2267 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2268 args->auth_flavors[0] = RPC_AUTH_UNIX;
2269 args->auth_flavor_len = 1;
2270 args->minorversion = 0;
2272 switch (data->version) {
2274 ap = (struct sockaddr_in *)&args->nfs_server.address;
2275 if (data->host_addrlen > sizeof(args->nfs_server.address))
2276 goto out_no_address;
2277 if (data->host_addrlen == 0)
2278 goto out_no_address;
2279 args->nfs_server.addrlen = data->host_addrlen;
2280 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2282 if (!nfs_verify_server_address((struct sockaddr *)
2283 &args->nfs_server.address))
2284 goto out_no_address;
2286 if (data->auth_flavourlen) {
2287 if (data->auth_flavourlen > 1)
2288 goto out_inval_auth;
2289 if (copy_from_user(&args->auth_flavors[0],
2290 data->auth_flavours,
2291 sizeof(args->auth_flavors[0])))
2295 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2298 args->nfs_server.hostname = c;
2300 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2303 args->nfs_server.export_path = c;
2304 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2306 c = strndup_user(data->client_addr.data, 16);
2309 args->client_address = c;
2312 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2316 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2317 args->rsize = data->rsize;
2318 args->wsize = data->wsize;
2319 args->timeo = data->timeo;
2320 args->retrans = data->retrans;
2321 args->acregmin = data->acregmin;
2322 args->acregmax = data->acregmax;
2323 args->acdirmin = data->acdirmin;
2324 args->acdirmax = data->acdirmax;
2325 args->nfs_server.protocol = data->proto;
2326 nfs_validate_transport_protocol(args);
2332 if (nfs_parse_mount_options((char *)options, args) == 0)
2335 if (!nfs_verify_server_address((struct sockaddr *)
2336 &args->nfs_server.address))
2339 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2340 args->nfs_server.port);
2342 nfs_validate_transport_protocol(args);
2344 nfs4_validate_mount_flags(args);
2346 if (args->auth_flavor_len > 1)
2347 goto out_inval_auth;
2349 if (args->client_address == NULL)
2350 goto out_no_client_address;
2352 status = nfs_parse_devname(dev_name,
2353 &args->nfs_server.hostname,
2355 &args->nfs_server.export_path,
2367 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2371 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2372 data->auth_flavourlen);
2376 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2379 out_no_client_address:
2380 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2385 * Get the superblock for the NFS4 root partition
2387 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2388 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2390 struct nfs_parsed_mount_data *data = raw_data;
2391 struct super_block *s;
2392 struct nfs_server *server;
2393 struct nfs_fh *mntfh;
2394 struct dentry *mntroot;
2395 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2396 struct nfs_sb_mountdata sb_mntdata = {
2399 int error = -ENOMEM;
2401 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2402 if (data == NULL || mntfh == NULL)
2405 security_init_mnt_opts(&data->lsm_opts);
2407 /* Get a volume representation */
2408 server = nfs4_create_server(data, mntfh);
2409 if (IS_ERR(server)) {
2410 error = PTR_ERR(server);
2413 sb_mntdata.server = server;
2415 if (server->flags & NFS4_MOUNT_UNSHARED)
2416 compare_super = NULL;
2418 /* Get a superblock - note that we may end up sharing one that already exists */
2419 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2425 if (s->s_fs_info != server) {
2426 nfs_free_server(server);
2429 error = nfs_bdi_register(server);
2431 goto error_splat_super;
2435 /* initial superblock/root creation */
2437 nfs_fscache_get_super_cookie(s, data);
2440 mntroot = nfs4_get_root(s, mntfh);
2441 if (IS_ERR(mntroot)) {
2442 error = PTR_ERR(mntroot);
2443 goto error_splat_super;
2446 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2448 goto error_splat_root;
2450 s->s_flags |= MS_ACTIVE;
2452 mnt->mnt_root = mntroot;
2456 security_free_mnt_opts(&data->lsm_opts);
2462 nfs_free_server(server);
2468 deactivate_locked_super(s);
2472 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2473 int flags, void *data, const char *hostname)
2475 struct vfsmount *root_mnt;
2479 len = strlen(hostname) + 3;
2480 root_devname = kmalloc(len, GFP_KERNEL);
2481 if (root_devname == NULL)
2482 return ERR_PTR(-ENOMEM);
2483 snprintf(root_devname, len, "%s:/", hostname);
2484 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2485 kfree(root_devname);
2489 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2491 char *page = (char *) __get_free_page(GFP_KERNEL);
2492 char *devname, *tmp;
2496 devname = nfs_path(path->mnt->mnt_devname,
2497 path->mnt->mnt_root, path->dentry,
2499 if (devname == NULL)
2501 tmp = kstrdup(devname, GFP_KERNEL);
2504 kfree(mnt->mnt_devname);
2505 mnt->mnt_devname = tmp;
2507 free_page((unsigned long)page);
2510 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2511 const char *export_path, struct vfsmount *mnt_target)
2513 struct mnt_namespace *ns_private;
2514 struct nameidata nd;
2515 struct super_block *s;
2518 ns_private = create_mnt_ns(root_mnt);
2519 ret = PTR_ERR(ns_private);
2520 if (IS_ERR(ns_private))
2523 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2524 export_path, LOOKUP_FOLLOW, &nd);
2526 put_mnt_ns(ns_private);
2531 s = nd.path.mnt->mnt_sb;
2532 atomic_inc(&s->s_active);
2533 mnt_target->mnt_sb = s;
2534 mnt_target->mnt_root = dget(nd.path.dentry);
2536 /* Correct the device pathname */
2537 nfs_fix_devname(&nd.path, mnt_target);
2540 down_write(&s->s_umount);
2549 * Get the superblock for an NFS4 mountpoint
2551 static int nfs4_get_sb(struct file_system_type *fs_type,
2552 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2554 struct nfs_parsed_mount_data *data;
2556 struct vfsmount *root_mnt;
2557 int error = -ENOMEM;
2559 data = kzalloc(sizeof(*data), GFP_KERNEL);
2563 /* Validate the mount data */
2564 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2568 export_path = data->nfs_server.export_path;
2569 data->nfs_server.export_path = "/";
2570 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2571 data->nfs_server.hostname);
2572 data->nfs_server.export_path = export_path;
2574 error = PTR_ERR(root_mnt);
2575 if (IS_ERR(root_mnt))
2578 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2581 kfree(data->client_address);
2582 kfree(data->nfs_server.export_path);
2583 kfree(data->nfs_server.hostname);
2584 kfree(data->fscache_uniq);
2587 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2588 error != 0 ? " [error]" : "");
2592 static void nfs4_kill_super(struct super_block *sb)
2594 struct nfs_server *server = NFS_SB(sb);
2596 dprintk("--> %s\n", __func__);
2597 nfs_super_return_all_delegations(sb);
2598 kill_anon_super(sb);
2599 nfs4_renewd_prepare_shutdown(server);
2600 nfs_fscache_release_super_cookie(sb);
2601 nfs_free_server(server);
2602 dprintk("<-- %s\n", __func__);
2606 * Clone an NFS4 server record on xdev traversal (FSID-change)
2608 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2609 const char *dev_name, void *raw_data,
2610 struct vfsmount *mnt)
2612 struct nfs_clone_mount *data = raw_data;
2613 struct super_block *s;
2614 struct nfs_server *server;
2615 struct dentry *mntroot;
2616 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2617 struct nfs_sb_mountdata sb_mntdata = {
2622 dprintk("--> nfs4_xdev_get_sb()\n");
2624 /* create a new volume representation */
2625 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2626 if (IS_ERR(server)) {
2627 error = PTR_ERR(server);
2628 goto out_err_noserver;
2630 sb_mntdata.server = server;
2632 if (server->flags & NFS4_MOUNT_UNSHARED)
2633 compare_super = NULL;
2635 /* Get a superblock - note that we may end up sharing one that already exists */
2636 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2642 if (s->s_fs_info != server) {
2643 nfs_free_server(server);
2646 error = nfs_bdi_register(server);
2648 goto error_splat_super;
2652 /* initial superblock/root creation */
2653 nfs4_clone_super(s, data->sb);
2656 mntroot = nfs4_get_root(s, data->fh);
2657 if (IS_ERR(mntroot)) {
2658 error = PTR_ERR(mntroot);
2659 goto error_splat_super;
2661 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2664 goto error_splat_super;
2667 s->s_flags |= MS_ACTIVE;
2669 mnt->mnt_root = mntroot;
2671 security_sb_clone_mnt_opts(data->sb, s);
2673 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2677 nfs_free_server(server);
2679 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2683 deactivate_locked_super(s);
2684 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2688 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2689 int flags, const char *dev_name, void *raw_data,
2690 struct vfsmount *mnt)
2692 struct nfs_clone_mount *data = raw_data;
2693 struct super_block *s;
2694 struct nfs_server *server;
2695 struct dentry *mntroot;
2696 struct nfs_fh mntfh;
2697 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2698 struct nfs_sb_mountdata sb_mntdata = {
2703 dprintk("--> nfs4_referral_get_sb()\n");
2705 /* create a new volume representation */
2706 server = nfs4_create_referral_server(data, &mntfh);
2707 if (IS_ERR(server)) {
2708 error = PTR_ERR(server);
2709 goto out_err_noserver;
2711 sb_mntdata.server = server;
2713 if (server->flags & NFS4_MOUNT_UNSHARED)
2714 compare_super = NULL;
2716 /* Get a superblock - note that we may end up sharing one that already exists */
2717 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2723 if (s->s_fs_info != server) {
2724 nfs_free_server(server);
2727 error = nfs_bdi_register(server);
2729 goto error_splat_super;
2733 /* initial superblock/root creation */
2737 mntroot = nfs4_get_root(s, &mntfh);
2738 if (IS_ERR(mntroot)) {
2739 error = PTR_ERR(mntroot);
2740 goto error_splat_super;
2742 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2745 goto error_splat_super;
2748 s->s_flags |= MS_ACTIVE;
2750 mnt->mnt_root = mntroot;
2752 security_sb_clone_mnt_opts(data->sb, s);
2754 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2758 nfs_free_server(server);
2760 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2764 deactivate_locked_super(s);
2765 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2770 * Create an NFS4 server record on referral traversal
2772 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2773 int flags, const char *dev_name, void *raw_data,
2774 struct vfsmount *mnt)
2776 struct nfs_clone_mount *data = raw_data;
2778 struct vfsmount *root_mnt;
2781 dprintk("--> nfs4_referral_get_sb()\n");
2783 export_path = data->mnt_path;
2784 data->mnt_path = "/";
2786 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2787 flags, data, data->hostname);
2788 data->mnt_path = export_path;
2790 error = PTR_ERR(root_mnt);
2791 if (IS_ERR(root_mnt))
2794 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2796 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2797 error != 0 ? " [error]" : "");
2801 #endif /* CONFIG_NFS_V4 */