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 * The flavor_len setting is for v4 mounts.
910 static int nfs_parse_security_flavors(char *value,
911 struct nfs_parsed_mount_data *mnt)
913 substring_t args[MAX_OPT_ARGS];
915 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
917 switch (match_token(value, nfs_secflavor_tokens, args)) {
919 mnt->auth_flavor_len = 0;
920 mnt->auth_flavors[0] = RPC_AUTH_NULL;
923 mnt->auth_flavor_len = 0;
924 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
927 mnt->auth_flavor_len = 1;
928 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
931 mnt->auth_flavor_len = 1;
932 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
935 mnt->auth_flavor_len = 1;
936 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
939 mnt->auth_flavor_len = 1;
940 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
943 mnt->auth_flavor_len = 1;
944 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
947 mnt->auth_flavor_len = 1;
948 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
951 mnt->auth_flavor_len = 1;
952 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
955 mnt->auth_flavor_len = 1;
956 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
959 mnt->auth_flavor_len = 1;
960 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
970 * Error-check and convert a string of mount options from user space into
971 * a data structure. The whole mount string is processed; bad options are
972 * skipped as they are encountered. If there were no errors, return 1;
973 * otherwise return 0 (zero).
975 static int nfs_parse_mount_options(char *raw,
976 struct nfs_parsed_mount_data *mnt)
978 char *p, *string, *secdata;
979 int rc, sloppy = 0, invalid_option = 0;
982 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
985 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
987 secdata = alloc_secdata();
991 rc = security_sb_copy_data(raw, secdata);
993 goto out_security_failure;
995 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
997 goto out_security_failure;
999 free_secdata(secdata);
1001 while ((p = strsep(&raw, ",")) != NULL) {
1002 substring_t args[MAX_OPT_ARGS];
1003 unsigned long option;
1009 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1011 token = match_token(p, nfs_mount_option_tokens, args);
1015 * boolean options: foo/nofoo
1018 mnt->flags |= NFS_MOUNT_SOFT;
1021 mnt->flags &= ~NFS_MOUNT_SOFT;
1024 mnt->flags |= NFS_MOUNT_POSIX;
1027 mnt->flags &= ~NFS_MOUNT_POSIX;
1030 mnt->flags &= ~NFS_MOUNT_NOCTO;
1033 mnt->flags |= NFS_MOUNT_NOCTO;
1036 mnt->flags &= ~NFS_MOUNT_NOAC;
1039 mnt->flags |= NFS_MOUNT_NOAC;
1042 mnt->flags &= ~NFS_MOUNT_NONLM;
1045 mnt->flags |= NFS_MOUNT_NONLM;
1048 mnt->flags &= ~NFS_MOUNT_VER3;
1051 mnt->flags |= NFS_MOUNT_VER3;
1054 mnt->flags &= ~NFS_MOUNT_TCP;
1055 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1058 mnt->flags |= NFS_MOUNT_TCP;
1059 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1062 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1063 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1064 xprt_load_transport(p);
1067 mnt->flags &= ~NFS_MOUNT_NOACL;
1070 mnt->flags |= NFS_MOUNT_NOACL;
1073 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1075 case Opt_nordirplus:
1076 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1078 case Opt_sharecache:
1079 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1081 case Opt_nosharecache:
1082 mnt->flags |= NFS_MOUNT_UNSHARED;
1085 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1087 case Opt_noresvport:
1088 mnt->flags |= NFS_MOUNT_NORESVPORT;
1091 mnt->options |= NFS_OPTION_FSCACHE;
1092 kfree(mnt->fscache_uniq);
1093 mnt->fscache_uniq = NULL;
1096 mnt->options &= ~NFS_OPTION_FSCACHE;
1097 kfree(mnt->fscache_uniq);
1098 mnt->fscache_uniq = NULL;
1100 case Opt_fscache_uniq:
1101 string = match_strdup(args);
1104 kfree(mnt->fscache_uniq);
1105 mnt->fscache_uniq = string;
1106 mnt->options |= NFS_OPTION_FSCACHE;
1110 * options that take numeric values
1113 string = match_strdup(args);
1116 rc = strict_strtoul(string, 10, &option);
1118 if (rc != 0 || option > USHORT_MAX)
1119 goto out_invalid_value;
1120 mnt->nfs_server.port = option;
1123 string = match_strdup(args);
1126 rc = strict_strtoul(string, 10, &option);
1129 goto out_invalid_value;
1130 mnt->rsize = option;
1133 string = match_strdup(args);
1136 rc = strict_strtoul(string, 10, &option);
1139 goto out_invalid_value;
1140 mnt->wsize = option;
1143 string = match_strdup(args);
1146 rc = strict_strtoul(string, 10, &option);
1149 goto out_invalid_value;
1150 mnt->bsize = option;
1153 string = match_strdup(args);
1156 rc = strict_strtoul(string, 10, &option);
1158 if (rc != 0 || option == 0)
1159 goto out_invalid_value;
1160 mnt->timeo = option;
1163 string = match_strdup(args);
1166 rc = strict_strtoul(string, 10, &option);
1168 if (rc != 0 || option == 0)
1169 goto out_invalid_value;
1170 mnt->retrans = option;
1173 string = match_strdup(args);
1176 rc = strict_strtoul(string, 10, &option);
1179 goto out_invalid_value;
1180 mnt->acregmin = option;
1183 string = match_strdup(args);
1186 rc = strict_strtoul(string, 10, &option);
1189 goto out_invalid_value;
1190 mnt->acregmax = option;
1193 string = match_strdup(args);
1196 rc = strict_strtoul(string, 10, &option);
1199 goto out_invalid_value;
1200 mnt->acdirmin = option;
1203 string = match_strdup(args);
1206 rc = strict_strtoul(string, 10, &option);
1209 goto out_invalid_value;
1210 mnt->acdirmax = option;
1213 string = match_strdup(args);
1216 rc = strict_strtoul(string, 10, &option);
1219 goto out_invalid_value;
1220 mnt->acregmin = mnt->acregmax =
1221 mnt->acdirmin = mnt->acdirmax = option;
1224 string = match_strdup(args);
1227 rc = strict_strtoul(string, 10, &option);
1230 goto out_invalid_value;
1231 mnt->namlen = option;
1234 string = match_strdup(args);
1237 rc = strict_strtoul(string, 10, &option);
1239 if (rc != 0 || option > USHORT_MAX)
1240 goto out_invalid_value;
1241 mnt->mount_server.port = option;
1244 string = match_strdup(args);
1247 rc = strict_strtoul(string, 10, &option);
1250 option < NFS_MNT_VERSION ||
1251 option > NFS_MNT3_VERSION)
1252 goto out_invalid_value;
1253 mnt->mount_server.version = option;
1256 string = match_strdup(args);
1259 rc = strict_strtoul(string, 10, &option);
1262 goto out_invalid_value;
1265 mnt->flags &= ~NFS_MOUNT_VER3;
1268 mnt->flags |= NFS_MOUNT_VER3;
1271 goto out_invalid_value;
1274 case Opt_minorversion:
1275 string = match_strdup(args);
1278 rc = strict_strtoul(string, 10, &option);
1281 goto out_invalid_value;
1282 if (option > NFS4_MAX_MINOR_VERSION)
1283 goto out_invalid_value;
1284 mnt->minorversion = option;
1288 * options that take text values
1291 string = match_strdup(args);
1294 rc = nfs_parse_security_flavors(string, mnt);
1297 dfprintk(MOUNT, "NFS: unrecognized "
1298 "security flavor\n");
1303 string = match_strdup(args);
1306 token = match_token(string,
1307 nfs_xprt_protocol_tokens, args);
1311 mnt->flags &= ~NFS_MOUNT_TCP;
1312 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1316 mnt->flags |= NFS_MOUNT_TCP;
1317 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1321 /* vector side protocols to TCP */
1322 mnt->flags |= NFS_MOUNT_TCP;
1323 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1324 xprt_load_transport(string);
1328 dfprintk(MOUNT, "NFS: unrecognized "
1329 "transport protocol\n");
1333 case Opt_mountproto:
1334 string = match_strdup(args);
1337 token = match_token(string,
1338 nfs_xprt_protocol_tokens, args);
1343 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1346 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1348 case Opt_xprt_rdma: /* not used for side protocols */
1350 dfprintk(MOUNT, "NFS: unrecognized "
1351 "transport protocol\n");
1356 string = match_strdup(args);
1359 nfs_parse_ip_address(string, strlen(string),
1361 &mnt->nfs_server.address,
1362 &mnt->nfs_server.addrlen);
1365 case Opt_clientaddr:
1366 string = match_strdup(args);
1369 kfree(mnt->client_address);
1370 mnt->client_address = string;
1373 string = match_strdup(args);
1376 kfree(mnt->mount_server.hostname);
1377 mnt->mount_server.hostname = string;
1380 string = match_strdup(args);
1383 nfs_parse_ip_address(string, strlen(string),
1385 &mnt->mount_server.address,
1386 &mnt->mount_server.addrlen);
1389 case Opt_lookupcache:
1390 string = match_strdup(args);
1393 token = match_token(string,
1394 nfs_lookupcache_tokens, args);
1397 case Opt_lookupcache_all:
1398 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1400 case Opt_lookupcache_positive:
1401 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1402 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1404 case Opt_lookupcache_none:
1405 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1408 dfprintk(MOUNT, "NFS: invalid "
1409 "lookupcache argument\n");
1419 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1422 case Opt_deprecated:
1423 dfprintk(MOUNT, "NFS: ignoring mount option "
1429 dfprintk(MOUNT, "NFS: unrecognized mount option "
1434 if (!sloppy && invalid_option)
1440 printk(KERN_INFO "NFS: bad mount option value specified: %s \n", p);
1443 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1445 out_security_failure:
1446 free_secdata(secdata);
1447 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1452 * Use the remote server's MOUNT service to request the NFS file handle
1453 * corresponding to the provided path.
1455 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1456 struct nfs_fh *root_fh)
1458 unsigned int auth_flavor_len = 0;
1459 struct nfs_mount_request request = {
1460 .sap = (struct sockaddr *)
1461 &args->mount_server.address,
1462 .dirpath = args->nfs_server.export_path,
1463 .protocol = args->mount_server.protocol,
1465 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1466 .auth_flav_len = &auth_flavor_len,
1470 if (args->mount_server.version == 0) {
1471 if (args->flags & NFS_MOUNT_VER3)
1472 args->mount_server.version = NFS_MNT3_VERSION;
1474 args->mount_server.version = NFS_MNT_VERSION;
1476 request.version = args->mount_server.version;
1478 if (args->mount_server.hostname)
1479 request.hostname = args->mount_server.hostname;
1481 request.hostname = args->nfs_server.hostname;
1484 * Construct the mount server's address.
1486 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1487 memcpy(request.sap, &args->nfs_server.address,
1488 args->nfs_server.addrlen);
1489 args->mount_server.addrlen = args->nfs_server.addrlen;
1491 request.salen = args->mount_server.addrlen;
1494 * autobind will be used if mount_server.port == 0
1496 nfs_set_port(request.sap, args->mount_server.port);
1499 * Now ask the mount server to map our export path
1502 status = nfs_mount(&request);
1506 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1507 request.hostname, status);
1511 static int nfs_parse_simple_hostname(const char *dev_name,
1512 char **hostname, size_t maxnamlen,
1513 char **export_path, size_t maxpathlen)
1516 char *colon, *comma;
1518 colon = strchr(dev_name, ':');
1520 goto out_bad_devname;
1522 len = colon - dev_name;
1523 if (len > maxnamlen)
1526 /* N.B. caller will free nfs_server.hostname in all cases */
1527 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1531 /* kill possible hostname list: not supported */
1532 comma = strchr(*hostname, ',');
1533 if (comma != NULL) {
1534 if (comma == *hostname)
1535 goto out_bad_devname;
1540 len = strlen(colon);
1541 if (len > maxpathlen)
1543 *export_path = kstrndup(colon, len, GFP_KERNEL);
1547 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1551 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1555 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1559 dfprintk(MOUNT, "NFS: server hostname too long\n");
1560 return -ENAMETOOLONG;
1563 dfprintk(MOUNT, "NFS: export pathname too long\n");
1564 return -ENAMETOOLONG;
1568 * Hostname has square brackets around it because it contains one or
1569 * more colons. We look for the first closing square bracket, and a
1570 * colon must follow it.
1572 static int nfs_parse_protected_hostname(const char *dev_name,
1573 char **hostname, size_t maxnamlen,
1574 char **export_path, size_t maxpathlen)
1579 start = (char *)(dev_name + 1);
1581 end = strchr(start, ']');
1583 goto out_bad_devname;
1584 if (*(end + 1) != ':')
1585 goto out_bad_devname;
1588 if (len > maxnamlen)
1591 /* N.B. caller will free nfs_server.hostname in all cases */
1592 *hostname = kstrndup(start, len, GFP_KERNEL);
1593 if (*hostname == NULL)
1598 if (len > maxpathlen)
1600 *export_path = kstrndup(end, len, GFP_KERNEL);
1607 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1611 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1615 dfprintk(MOUNT, "NFS: server hostname too long\n");
1616 return -ENAMETOOLONG;
1619 dfprintk(MOUNT, "NFS: export pathname too long\n");
1620 return -ENAMETOOLONG;
1624 * Split "dev_name" into "hostname:export_path".
1626 * The leftmost colon demarks the split between the server's hostname
1627 * and the export path. If the hostname starts with a left square
1628 * bracket, then it may contain colons.
1630 * Note: caller frees hostname and export path, even on error.
1632 static int nfs_parse_devname(const char *dev_name,
1633 char **hostname, size_t maxnamlen,
1634 char **export_path, size_t maxpathlen)
1636 if (*dev_name == '[')
1637 return nfs_parse_protected_hostname(dev_name,
1638 hostname, maxnamlen,
1639 export_path, maxpathlen);
1641 return nfs_parse_simple_hostname(dev_name,
1642 hostname, maxnamlen,
1643 export_path, maxpathlen);
1647 * Validate the NFS2/NFS3 mount data
1648 * - fills in the mount root filehandle
1650 * For option strings, user space handles the following behaviors:
1652 * + DNS: mapping server host name to IP address ("addr=" option)
1654 * + failure mode: how to behave if a mount request can't be handled
1655 * immediately ("fg/bg" option)
1657 * + retry: how often to retry a mount request ("retry=" option)
1659 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1660 * mountproto=tcp after mountproto=udp, and so on
1662 static int nfs_validate_mount_data(void *options,
1663 struct nfs_parsed_mount_data *args,
1664 struct nfs_fh *mntfh,
1665 const char *dev_name)
1667 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1672 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1673 args->rsize = NFS_MAX_FILE_IO_SIZE;
1674 args->wsize = NFS_MAX_FILE_IO_SIZE;
1675 args->acregmin = NFS_DEF_ACREGMIN;
1676 args->acregmax = NFS_DEF_ACREGMAX;
1677 args->acdirmin = NFS_DEF_ACDIRMIN;
1678 args->acdirmax = NFS_DEF_ACDIRMAX;
1679 args->mount_server.port = 0; /* autobind unless user sets port */
1680 args->nfs_server.port = 0; /* autobind unless user sets port */
1681 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1682 args->auth_flavors[0] = RPC_AUTH_UNIX;
1684 switch (data->version) {
1690 if (data->flags & NFS_MOUNT_VER3)
1692 data->root.size = NFS2_FHSIZE;
1693 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1695 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1698 memset(data->context, 0, sizeof(data->context));
1700 if (data->flags & NFS_MOUNT_VER3) {
1701 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1702 goto out_invalid_fh;
1703 mntfh->size = data->root.size;
1705 mntfh->size = NFS2_FHSIZE;
1708 memcpy(mntfh->data, data->root.data, mntfh->size);
1709 if (mntfh->size < sizeof(mntfh->data))
1710 memset(mntfh->data + mntfh->size, 0,
1711 sizeof(mntfh->data) - mntfh->size);
1714 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1717 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1718 args->rsize = data->rsize;
1719 args->wsize = data->wsize;
1720 args->timeo = data->timeo;
1721 args->retrans = data->retrans;
1722 args->acregmin = data->acregmin;
1723 args->acregmax = data->acregmax;
1724 args->acdirmin = data->acdirmin;
1725 args->acdirmax = data->acdirmax;
1727 memcpy(&args->nfs_server.address, &data->addr,
1728 sizeof(data->addr));
1729 args->nfs_server.addrlen = sizeof(data->addr);
1730 if (!nfs_verify_server_address((struct sockaddr *)
1731 &args->nfs_server.address))
1732 goto out_no_address;
1734 if (!(data->flags & NFS_MOUNT_TCP))
1735 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1736 /* N.B. caller will free nfs_server.hostname in all cases */
1737 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1738 args->namlen = data->namlen;
1739 args->bsize = data->bsize;
1741 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1742 args->auth_flavors[0] = data->pseudoflavor;
1743 if (!args->nfs_server.hostname)
1747 * The legacy version 6 binary mount data from userspace has a
1748 * field used only to transport selinux information into the
1749 * the kernel. To continue to support that functionality we
1750 * have a touch of selinux knowledge here in the NFS code. The
1751 * userspace code converted context=blah to just blah so we are
1752 * converting back to the full string selinux understands.
1754 if (data->context[0]){
1755 #ifdef CONFIG_SECURITY_SELINUX
1757 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1760 strcpy(opts_str, "context=");
1761 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1762 strcat(opts_str, &data->context[0]);
1763 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1776 if (nfs_parse_mount_options((char *)options, args) == 0)
1779 if (!nfs_verify_server_address((struct sockaddr *)
1780 &args->nfs_server.address))
1781 goto out_no_address;
1783 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1784 args->nfs_server.port);
1786 nfs_set_mount_transport_protocol(args);
1788 status = nfs_parse_devname(dev_name,
1789 &args->nfs_server.hostname,
1791 &args->nfs_server.export_path,
1794 status = nfs_try_mount(args, mntfh);
1796 kfree(args->nfs_server.export_path);
1797 args->nfs_server.export_path = NULL;
1806 #ifndef CONFIG_NFS_V3
1807 if (args->flags & NFS_MOUNT_VER3)
1808 goto out_v3_not_compiled;
1809 #endif /* !CONFIG_NFS_V3 */
1814 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1818 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1823 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1826 #ifndef CONFIG_NFS_V3
1827 out_v3_not_compiled:
1828 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1829 return -EPROTONOSUPPORT;
1830 #endif /* !CONFIG_NFS_V3 */
1833 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1837 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1841 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1846 nfs_compare_remount_data(struct nfs_server *nfss,
1847 struct nfs_parsed_mount_data *data)
1849 if (data->flags != nfss->flags ||
1850 data->rsize != nfss->rsize ||
1851 data->wsize != nfss->wsize ||
1852 data->retrans != nfss->client->cl_timeout->to_retries ||
1853 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1854 data->acregmin != nfss->acregmin / HZ ||
1855 data->acregmax != nfss->acregmax / HZ ||
1856 data->acdirmin != nfss->acdirmin / HZ ||
1857 data->acdirmax != nfss->acdirmax / HZ ||
1858 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1859 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1860 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1861 data->nfs_server.addrlen) != 0)
1868 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1871 struct nfs_server *nfss = sb->s_fs_info;
1872 struct nfs_parsed_mount_data *data;
1873 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1874 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1875 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1878 * Userspace mount programs that send binary options generally send
1879 * them populated with default values. We have no way to know which
1880 * ones were explicitly specified. Fall back to legacy behavior and
1881 * just return success.
1883 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1884 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1885 options->version <= 6))))
1888 data = kzalloc(sizeof(*data), GFP_KERNEL);
1893 /* fill out struct with values from existing mount */
1894 data->flags = nfss->flags;
1895 data->rsize = nfss->rsize;
1896 data->wsize = nfss->wsize;
1897 data->retrans = nfss->client->cl_timeout->to_retries;
1898 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1899 data->acregmin = nfss->acregmin / HZ;
1900 data->acregmax = nfss->acregmax / HZ;
1901 data->acdirmin = nfss->acdirmin / HZ;
1902 data->acdirmax = nfss->acdirmax / HZ;
1903 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1904 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1905 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1906 data->nfs_server.addrlen);
1908 /* overwrite those values with any that were specified */
1909 error = nfs_parse_mount_options((char *)options, data);
1913 /* compare new mount options with old ones */
1914 error = nfs_compare_remount_data(nfss, data);
1922 * Initialise the common bits of the superblock
1924 static inline void nfs_initialise_sb(struct super_block *sb)
1926 struct nfs_server *server = NFS_SB(sb);
1928 sb->s_magic = NFS_SUPER_MAGIC;
1930 /* We probably want something more informative here */
1931 snprintf(sb->s_id, sizeof(sb->s_id),
1932 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1934 if (sb->s_blocksize == 0)
1935 sb->s_blocksize = nfs_block_bits(server->wsize,
1936 &sb->s_blocksize_bits);
1938 if (server->flags & NFS_MOUNT_NOAC)
1939 sb->s_flags |= MS_SYNCHRONOUS;
1941 nfs_super_set_maxbytes(sb, server->maxfilesize);
1945 * Finish setting up an NFS2/3 superblock
1947 static void nfs_fill_super(struct super_block *sb,
1948 struct nfs_parsed_mount_data *data)
1950 struct nfs_server *server = NFS_SB(sb);
1952 sb->s_blocksize_bits = 0;
1953 sb->s_blocksize = 0;
1955 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1957 if (server->flags & NFS_MOUNT_VER3) {
1958 /* The VFS shouldn't apply the umask to mode bits. We will do
1959 * so ourselves when necessary.
1961 sb->s_flags |= MS_POSIXACL;
1962 sb->s_time_gran = 1;
1965 sb->s_op = &nfs_sops;
1966 nfs_initialise_sb(sb);
1970 * Finish setting up a cloned NFS2/3 superblock
1972 static void nfs_clone_super(struct super_block *sb,
1973 const struct super_block *old_sb)
1975 struct nfs_server *server = NFS_SB(sb);
1977 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1978 sb->s_blocksize = old_sb->s_blocksize;
1979 sb->s_maxbytes = old_sb->s_maxbytes;
1981 if (server->flags & NFS_MOUNT_VER3) {
1982 /* The VFS shouldn't apply the umask to mode bits. We will do
1983 * so ourselves when necessary.
1985 sb->s_flags |= MS_POSIXACL;
1986 sb->s_time_gran = 1;
1989 sb->s_op = old_sb->s_op;
1990 nfs_initialise_sb(sb);
1993 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1995 const struct nfs_server *a = s->s_fs_info;
1996 const struct rpc_clnt *clnt_a = a->client;
1997 const struct rpc_clnt *clnt_b = b->client;
1999 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2001 if (a->nfs_client != b->nfs_client)
2003 if (a->flags != b->flags)
2005 if (a->wsize != b->wsize)
2007 if (a->rsize != b->rsize)
2009 if (a->acregmin != b->acregmin)
2011 if (a->acregmax != b->acregmax)
2013 if (a->acdirmin != b->acdirmin)
2015 if (a->acdirmax != b->acdirmax)
2017 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2024 struct nfs_sb_mountdata {
2025 struct nfs_server *server;
2029 static int nfs_set_super(struct super_block *s, void *data)
2031 struct nfs_sb_mountdata *sb_mntdata = data;
2032 struct nfs_server *server = sb_mntdata->server;
2035 s->s_flags = sb_mntdata->mntflags;
2036 s->s_fs_info = server;
2037 ret = set_anon_super(s, server);
2039 server->s_dev = s->s_dev;
2043 static int nfs_compare_super_address(struct nfs_server *server1,
2044 struct nfs_server *server2)
2046 struct sockaddr *sap1, *sap2;
2048 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2049 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2051 if (sap1->sa_family != sap2->sa_family)
2054 switch (sap1->sa_family) {
2056 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2057 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2058 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2060 if (sin1->sin_port != sin2->sin_port)
2065 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2066 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2067 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2069 if (sin1->sin6_port != sin2->sin6_port)
2080 static int nfs_compare_super(struct super_block *sb, void *data)
2082 struct nfs_sb_mountdata *sb_mntdata = data;
2083 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2084 int mntflags = sb_mntdata->mntflags;
2086 if (!nfs_compare_super_address(old, server))
2088 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2089 if (old->flags & NFS_MOUNT_UNSHARED)
2091 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2093 return nfs_compare_mount_options(sb, server, mntflags);
2096 static int nfs_bdi_register(struct nfs_server *server)
2098 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2101 static int nfs_get_sb(struct file_system_type *fs_type,
2102 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2104 struct nfs_server *server = NULL;
2105 struct super_block *s;
2106 struct nfs_parsed_mount_data *data;
2107 struct nfs_fh *mntfh;
2108 struct dentry *mntroot;
2109 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2110 struct nfs_sb_mountdata sb_mntdata = {
2113 int error = -ENOMEM;
2115 data = kzalloc(sizeof(*data), GFP_KERNEL);
2116 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2117 if (data == NULL || mntfh == NULL)
2120 security_init_mnt_opts(&data->lsm_opts);
2122 /* Validate the mount data */
2123 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2127 /* Get a volume representation */
2128 server = nfs_create_server(data, mntfh);
2129 if (IS_ERR(server)) {
2130 error = PTR_ERR(server);
2133 sb_mntdata.server = server;
2135 if (server->flags & NFS_MOUNT_UNSHARED)
2136 compare_super = NULL;
2138 /* Get a superblock - note that we may end up sharing one that already exists */
2139 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2145 if (s->s_fs_info != server) {
2146 nfs_free_server(server);
2149 error = nfs_bdi_register(server);
2151 goto error_splat_super;
2155 /* initial superblock/root creation */
2156 nfs_fill_super(s, data);
2157 nfs_fscache_get_super_cookie(s, data);
2160 mntroot = nfs_get_root(s, mntfh);
2161 if (IS_ERR(mntroot)) {
2162 error = PTR_ERR(mntroot);
2163 goto error_splat_super;
2166 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2168 goto error_splat_root;
2170 s->s_flags |= MS_ACTIVE;
2172 mnt->mnt_root = mntroot;
2176 kfree(data->nfs_server.hostname);
2177 kfree(data->mount_server.hostname);
2178 kfree(data->fscache_uniq);
2179 security_free_mnt_opts(&data->lsm_opts);
2186 nfs_free_server(server);
2192 deactivate_locked_super(s);
2197 * Destroy an NFS2/3 superblock
2199 static void nfs_kill_super(struct super_block *s)
2201 struct nfs_server *server = NFS_SB(s);
2203 bdi_unregister(&server->backing_dev_info);
2205 nfs_fscache_release_super_cookie(s);
2206 nfs_free_server(server);
2210 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2212 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2213 const char *dev_name, void *raw_data,
2214 struct vfsmount *mnt)
2216 struct nfs_clone_mount *data = raw_data;
2217 struct super_block *s;
2218 struct nfs_server *server;
2219 struct dentry *mntroot;
2220 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2221 struct nfs_sb_mountdata sb_mntdata = {
2226 dprintk("--> nfs_xdev_get_sb()\n");
2228 /* create a new volume representation */
2229 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2230 if (IS_ERR(server)) {
2231 error = PTR_ERR(server);
2232 goto out_err_noserver;
2234 sb_mntdata.server = server;
2236 if (server->flags & NFS_MOUNT_UNSHARED)
2237 compare_super = NULL;
2239 /* Get a superblock - note that we may end up sharing one that already exists */
2240 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2246 if (s->s_fs_info != server) {
2247 nfs_free_server(server);
2250 error = nfs_bdi_register(server);
2252 goto error_splat_super;
2256 /* initial superblock/root creation */
2257 nfs_clone_super(s, data->sb);
2260 mntroot = nfs_get_root(s, data->fh);
2261 if (IS_ERR(mntroot)) {
2262 error = PTR_ERR(mntroot);
2263 goto error_splat_super;
2265 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2268 goto error_splat_super;
2271 s->s_flags |= MS_ACTIVE;
2273 mnt->mnt_root = mntroot;
2275 /* clone any lsm security options from the parent to the new sb */
2276 security_sb_clone_mnt_opts(data->sb, s);
2278 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2282 nfs_free_server(server);
2284 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2288 deactivate_locked_super(s);
2289 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2293 #ifdef CONFIG_NFS_V4
2296 * Finish setting up a cloned NFS4 superblock
2298 static void nfs4_clone_super(struct super_block *sb,
2299 const struct super_block *old_sb)
2301 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2302 sb->s_blocksize = old_sb->s_blocksize;
2303 sb->s_maxbytes = old_sb->s_maxbytes;
2304 sb->s_time_gran = 1;
2305 sb->s_op = old_sb->s_op;
2306 nfs_initialise_sb(sb);
2310 * Set up an NFS4 superblock
2312 static void nfs4_fill_super(struct super_block *sb)
2314 sb->s_time_gran = 1;
2315 sb->s_op = &nfs4_sops;
2316 nfs_initialise_sb(sb);
2319 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2321 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2325 * Validate NFSv4 mount options
2327 static int nfs4_validate_mount_data(void *options,
2328 struct nfs_parsed_mount_data *args,
2329 const char *dev_name)
2331 struct sockaddr_in *ap;
2332 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2338 args->rsize = NFS_MAX_FILE_IO_SIZE;
2339 args->wsize = NFS_MAX_FILE_IO_SIZE;
2340 args->acregmin = NFS_DEF_ACREGMIN;
2341 args->acregmax = NFS_DEF_ACREGMAX;
2342 args->acdirmin = NFS_DEF_ACDIRMIN;
2343 args->acdirmax = NFS_DEF_ACDIRMAX;
2344 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2345 args->auth_flavors[0] = RPC_AUTH_UNIX;
2346 args->auth_flavor_len = 0;
2347 args->minorversion = 0;
2349 switch (data->version) {
2351 ap = (struct sockaddr_in *)&args->nfs_server.address;
2352 if (data->host_addrlen > sizeof(args->nfs_server.address))
2353 goto out_no_address;
2354 if (data->host_addrlen == 0)
2355 goto out_no_address;
2356 args->nfs_server.addrlen = data->host_addrlen;
2357 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2359 if (!nfs_verify_server_address((struct sockaddr *)
2360 &args->nfs_server.address))
2361 goto out_no_address;
2363 if (data->auth_flavourlen) {
2364 if (data->auth_flavourlen > 1)
2365 goto out_inval_auth;
2366 if (copy_from_user(&args->auth_flavors[0],
2367 data->auth_flavours,
2368 sizeof(args->auth_flavors[0])))
2372 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2375 args->nfs_server.hostname = c;
2377 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2380 args->nfs_server.export_path = c;
2381 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2383 c = strndup_user(data->client_addr.data, 16);
2386 args->client_address = c;
2389 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2393 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2394 args->rsize = data->rsize;
2395 args->wsize = data->wsize;
2396 args->timeo = data->timeo;
2397 args->retrans = data->retrans;
2398 args->acregmin = data->acregmin;
2399 args->acregmax = data->acregmax;
2400 args->acdirmin = data->acdirmin;
2401 args->acdirmax = data->acdirmax;
2402 args->nfs_server.protocol = data->proto;
2403 nfs_validate_transport_protocol(args);
2409 if (nfs_parse_mount_options((char *)options, args) == 0)
2412 if (!nfs_verify_server_address((struct sockaddr *)
2413 &args->nfs_server.address))
2416 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2417 args->nfs_server.port);
2419 nfs_validate_transport_protocol(args);
2421 nfs4_validate_mount_flags(args);
2423 if (args->auth_flavor_len > 1)
2424 goto out_inval_auth;
2426 if (args->client_address == NULL)
2427 goto out_no_client_address;
2429 status = nfs_parse_devname(dev_name,
2430 &args->nfs_server.hostname,
2432 &args->nfs_server.export_path,
2444 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2448 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2449 data->auth_flavourlen);
2453 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2456 out_no_client_address:
2457 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2462 * Get the superblock for the NFS4 root partition
2464 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2465 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2467 struct nfs_parsed_mount_data *data = raw_data;
2468 struct super_block *s;
2469 struct nfs_server *server;
2470 struct nfs_fh *mntfh;
2471 struct dentry *mntroot;
2472 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2473 struct nfs_sb_mountdata sb_mntdata = {
2476 int error = -ENOMEM;
2478 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2479 if (data == NULL || mntfh == NULL)
2482 security_init_mnt_opts(&data->lsm_opts);
2484 /* Get a volume representation */
2485 server = nfs4_create_server(data, mntfh);
2486 if (IS_ERR(server)) {
2487 error = PTR_ERR(server);
2490 sb_mntdata.server = server;
2492 if (server->flags & NFS4_MOUNT_UNSHARED)
2493 compare_super = NULL;
2495 /* Get a superblock - note that we may end up sharing one that already exists */
2496 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2502 if (s->s_fs_info != server) {
2503 nfs_free_server(server);
2506 error = nfs_bdi_register(server);
2508 goto error_splat_super;
2512 /* initial superblock/root creation */
2514 nfs_fscache_get_super_cookie(s, data);
2517 mntroot = nfs4_get_root(s, mntfh);
2518 if (IS_ERR(mntroot)) {
2519 error = PTR_ERR(mntroot);
2520 goto error_splat_super;
2523 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2525 goto error_splat_root;
2527 s->s_flags |= MS_ACTIVE;
2529 mnt->mnt_root = mntroot;
2533 security_free_mnt_opts(&data->lsm_opts);
2539 nfs_free_server(server);
2545 deactivate_locked_super(s);
2549 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2550 int flags, void *data, const char *hostname)
2552 struct vfsmount *root_mnt;
2556 len = strlen(hostname) + 3;
2557 root_devname = kmalloc(len, GFP_KERNEL);
2558 if (root_devname == NULL)
2559 return ERR_PTR(-ENOMEM);
2560 snprintf(root_devname, len, "%s:/", hostname);
2561 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2562 kfree(root_devname);
2566 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2568 char *page = (char *) __get_free_page(GFP_KERNEL);
2569 char *devname, *tmp;
2573 devname = nfs_path(path->mnt->mnt_devname,
2574 path->mnt->mnt_root, path->dentry,
2576 if (devname == NULL)
2578 tmp = kstrdup(devname, GFP_KERNEL);
2581 kfree(mnt->mnt_devname);
2582 mnt->mnt_devname = tmp;
2584 free_page((unsigned long)page);
2587 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2588 const char *export_path, struct vfsmount *mnt_target)
2590 struct mnt_namespace *ns_private;
2591 struct nameidata nd;
2592 struct super_block *s;
2595 ns_private = create_mnt_ns(root_mnt);
2596 ret = PTR_ERR(ns_private);
2597 if (IS_ERR(ns_private))
2600 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2601 export_path, LOOKUP_FOLLOW, &nd);
2603 put_mnt_ns(ns_private);
2608 s = nd.path.mnt->mnt_sb;
2609 atomic_inc(&s->s_active);
2610 mnt_target->mnt_sb = s;
2611 mnt_target->mnt_root = dget(nd.path.dentry);
2613 /* Correct the device pathname */
2614 nfs_fix_devname(&nd.path, mnt_target);
2617 down_write(&s->s_umount);
2626 * Get the superblock for an NFS4 mountpoint
2628 static int nfs4_get_sb(struct file_system_type *fs_type,
2629 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2631 struct nfs_parsed_mount_data *data;
2633 struct vfsmount *root_mnt;
2634 int error = -ENOMEM;
2636 data = kzalloc(sizeof(*data), GFP_KERNEL);
2640 /* Validate the mount data */
2641 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2645 export_path = data->nfs_server.export_path;
2646 data->nfs_server.export_path = "/";
2647 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2648 data->nfs_server.hostname);
2649 data->nfs_server.export_path = export_path;
2651 error = PTR_ERR(root_mnt);
2652 if (IS_ERR(root_mnt))
2655 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2658 kfree(data->client_address);
2659 kfree(data->nfs_server.export_path);
2660 kfree(data->nfs_server.hostname);
2661 kfree(data->fscache_uniq);
2664 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2665 error != 0 ? " [error]" : "");
2669 static void nfs4_kill_super(struct super_block *sb)
2671 struct nfs_server *server = NFS_SB(sb);
2673 dprintk("--> %s\n", __func__);
2674 nfs_super_return_all_delegations(sb);
2675 kill_anon_super(sb);
2676 nfs4_renewd_prepare_shutdown(server);
2677 nfs_fscache_release_super_cookie(sb);
2678 nfs_free_server(server);
2679 dprintk("<-- %s\n", __func__);
2683 * Clone an NFS4 server record on xdev traversal (FSID-change)
2685 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2686 const char *dev_name, void *raw_data,
2687 struct vfsmount *mnt)
2689 struct nfs_clone_mount *data = raw_data;
2690 struct super_block *s;
2691 struct nfs_server *server;
2692 struct dentry *mntroot;
2693 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2694 struct nfs_sb_mountdata sb_mntdata = {
2699 dprintk("--> nfs4_xdev_get_sb()\n");
2701 /* create a new volume representation */
2702 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2703 if (IS_ERR(server)) {
2704 error = PTR_ERR(server);
2705 goto out_err_noserver;
2707 sb_mntdata.server = server;
2709 if (server->flags & NFS4_MOUNT_UNSHARED)
2710 compare_super = NULL;
2712 /* Get a superblock - note that we may end up sharing one that already exists */
2713 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2719 if (s->s_fs_info != server) {
2720 nfs_free_server(server);
2723 error = nfs_bdi_register(server);
2725 goto error_splat_super;
2729 /* initial superblock/root creation */
2730 nfs4_clone_super(s, data->sb);
2733 mntroot = nfs4_get_root(s, data->fh);
2734 if (IS_ERR(mntroot)) {
2735 error = PTR_ERR(mntroot);
2736 goto error_splat_super;
2738 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2741 goto error_splat_super;
2744 s->s_flags |= MS_ACTIVE;
2746 mnt->mnt_root = mntroot;
2748 security_sb_clone_mnt_opts(data->sb, s);
2750 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2754 nfs_free_server(server);
2756 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2760 deactivate_locked_super(s);
2761 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2765 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2766 int flags, const char *dev_name, void *raw_data,
2767 struct vfsmount *mnt)
2769 struct nfs_clone_mount *data = raw_data;
2770 struct super_block *s;
2771 struct nfs_server *server;
2772 struct dentry *mntroot;
2773 struct nfs_fh mntfh;
2774 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2775 struct nfs_sb_mountdata sb_mntdata = {
2780 dprintk("--> nfs4_referral_get_sb()\n");
2782 /* create a new volume representation */
2783 server = nfs4_create_referral_server(data, &mntfh);
2784 if (IS_ERR(server)) {
2785 error = PTR_ERR(server);
2786 goto out_err_noserver;
2788 sb_mntdata.server = server;
2790 if (server->flags & NFS4_MOUNT_UNSHARED)
2791 compare_super = NULL;
2793 /* Get a superblock - note that we may end up sharing one that already exists */
2794 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2800 if (s->s_fs_info != server) {
2801 nfs_free_server(server);
2804 error = nfs_bdi_register(server);
2806 goto error_splat_super;
2810 /* initial superblock/root creation */
2814 mntroot = nfs4_get_root(s, &mntfh);
2815 if (IS_ERR(mntroot)) {
2816 error = PTR_ERR(mntroot);
2817 goto error_splat_super;
2819 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2822 goto error_splat_super;
2825 s->s_flags |= MS_ACTIVE;
2827 mnt->mnt_root = mntroot;
2829 security_sb_clone_mnt_opts(data->sb, s);
2831 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2835 nfs_free_server(server);
2837 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2841 deactivate_locked_super(s);
2842 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2847 * Create an NFS4 server record on referral traversal
2849 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2850 int flags, const char *dev_name, void *raw_data,
2851 struct vfsmount *mnt)
2853 struct nfs_clone_mount *data = raw_data;
2855 struct vfsmount *root_mnt;
2858 dprintk("--> nfs4_referral_get_sb()\n");
2860 export_path = data->mnt_path;
2861 data->mnt_path = "/";
2863 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2864 flags, data, data->hostname);
2865 data->mnt_path = export_path;
2867 error = PTR_ERR(root_mnt);
2868 if (IS_ERR(root_mnt))
2871 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2873 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2874 error != 0 ? " [error]" : "");
2878 #endif /* CONFIG_NFS_V4 */