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NFSv4: Clean up the OPEN/CLOSE serialisation code
[linux-2.6-block.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 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())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.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>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
42#include <linux/smp_lock.h>
43#include <linux/seq_file.h>
44#include <linux/mount.h>
45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
48#include <linux/nfs_xdr.h>
b5d5dfbd 49#include <linux/magic.h>
bf0fd768 50#include <linux/parser.h>
f7b422b1
DH		 51
52#include <asm/system.h>
53#include <asm/uaccess.h>
54
55#include "nfs4_fs.h"
56#include "callback.h"
57#include "delegation.h"
58#include "iostat.h"
59#include "internal.h"
60
61#define NFSDBG_FACILITY NFSDBG_VFS
62
bf0fd768
CL		 63enum {
64 /* Mount options that take no arguments */
65 Opt_soft, Opt_hard,
66 Opt_intr, Opt_nointr,
67 Opt_posix, Opt_noposix,
68 Opt_cto, Opt_nocto,
69 Opt_ac, Opt_noac,
70 Opt_lock, Opt_nolock,
71 Opt_v2, Opt_v3,
2cf7ff7a 72 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 73 Opt_acl, Opt_noacl,
74 Opt_rdirplus, Opt_nordirplus,
75180df2 75 Opt_sharecache, Opt_nosharecache,
bf0fd768
CL		 76
77 /* Mount options that take integer arguments */
78 Opt_port,
79 Opt_rsize, Opt_wsize, Opt_bsize,
80 Opt_timeo, Opt_retrans,
81 Opt_acregmin, Opt_acregmax,
82 Opt_acdirmin, Opt_acdirmax,
83 Opt_actimeo,
84 Opt_namelen,
85 Opt_mountport,
86 Opt_mountprog, Opt_mountvers,
87 Opt_nfsprog, Opt_nfsvers,
88
89 /* Mount options that take string arguments */
90 Opt_sec, Opt_proto, Opt_mountproto,
0ac83779 91 Opt_addr, Opt_mountaddr, Opt_clientaddr,
bf0fd768
CL		 92
93 /* Mount options that are ignored */
94 Opt_userspace, Opt_deprecated,
95
96 Opt_err
97};
98
99static match_table_t nfs_mount_option_tokens = {
100 { Opt_userspace, "bg" },
101 { Opt_userspace, "fg" },
102 { Opt_soft, "soft" },
103 { Opt_hard, "hard" },
104 { Opt_intr, "intr" },
105 { Opt_nointr, "nointr" },
106 { Opt_posix, "posix" },
107 { Opt_noposix, "noposix" },
108 { Opt_cto, "cto" },
109 { Opt_nocto, "nocto" },
110 { Opt_ac, "ac" },
111 { Opt_noac, "noac" },
112 { Opt_lock, "lock" },
113 { Opt_nolock, "nolock" },
114 { Opt_v2, "v2" },
115 { Opt_v3, "v3" },
116 { Opt_udp, "udp" },
117 { Opt_tcp, "tcp" },
2cf7ff7a 118 { Opt_rdma, "rdma" },
bf0fd768
CL		 119 { Opt_acl, "acl" },
120 { Opt_noacl, "noacl" },
121 { Opt_rdirplus, "rdirplus" },
122 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 123 { Opt_sharecache, "sharecache" },
124 { Opt_nosharecache, "nosharecache" },
bf0fd768
CL		 125
126 { Opt_port, "port=%u" },
127 { Opt_rsize, "rsize=%u" },
128 { Opt_wsize, "wsize=%u" },
129 { Opt_bsize, "bsize=%u" },
130 { Opt_timeo, "timeo=%u" },
131 { Opt_retrans, "retrans=%u" },
132 { Opt_acregmin, "acregmin=%u" },
133 { Opt_acregmax, "acregmax=%u" },
134 { Opt_acdirmin, "acdirmin=%u" },
135 { Opt_acdirmax, "acdirmax=%u" },
136 { Opt_actimeo, "actimeo=%u" },
137 { Opt_userspace, "retry=%u" },
138 { Opt_namelen, "namlen=%u" },
139 { Opt_mountport, "mountport=%u" },
140 { Opt_mountprog, "mountprog=%u" },
141 { Opt_mountvers, "mountvers=%u" },
142 { Opt_nfsprog, "nfsprog=%u" },
143 { Opt_nfsvers, "nfsvers=%u" },
144 { Opt_nfsvers, "vers=%u" },
145
146 { Opt_sec, "sec=%s" },
147 { Opt_proto, "proto=%s" },
148 { Opt_mountproto, "mountproto=%s" },
149 { Opt_addr, "addr=%s" },
150 { Opt_clientaddr, "clientaddr=%s" },
0ac83779
CL		 151 { Opt_userspace, "mounthost=%s" },
152 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768
CL		 153
154 { Opt_err, NULL }
155};
156
157enum {
2cf7ff7a 158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
bf0fd768
CL		 159
160 Opt_xprt_err
161};
162
163static match_table_t nfs_xprt_protocol_tokens = {
164 { Opt_xprt_udp, "udp" },
165 { Opt_xprt_tcp, "tcp" },
2cf7ff7a 166 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 167
168 { Opt_xprt_err, NULL }
169};
170
171enum {
172 Opt_sec_none, Opt_sec_sys,
173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
176
177 Opt_sec_err
178};
179
180static match_table_t nfs_secflavor_tokens = {
181 { Opt_sec_none, "none" },
182 { Opt_sec_none, "null" },
183 { Opt_sec_sys, "sys" },
184
185 { Opt_sec_krb5, "krb5" },
186 { Opt_sec_krb5i, "krb5i" },
187 { Opt_sec_krb5p, "krb5p" },
188
189 { Opt_sec_lkey, "lkey" },
190 { Opt_sec_lkeyi, "lkeyi" },
191 { Opt_sec_lkeyp, "lkeyp" },
192
193 { Opt_sec_err, NULL }
194};
195
196
f7b422b1 197static void nfs_umount_begin(struct vfsmount *, int);
816724e6 198static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1
DH		 199static int nfs_show_options(struct seq_file *, struct vfsmount *);
200static int nfs_show_stats(struct seq_file *, struct vfsmount *);
816724e6 201static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
54ceac45 202static int nfs_xdev_get_sb(struct file_system_type *fs_type,
816724e6 203 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 204static void nfs_kill_super(struct super_block *);
205
206static struct file_system_type nfs_fs_type = {
207 .owner = THIS_MODULE,
208 .name = "nfs",
209 .get_sb = nfs_get_sb,
210 .kill_sb = nfs_kill_super,
349457cc 211 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 212};
213
54ceac45 214struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 215 .owner = THIS_MODULE,
216 .name = "nfs",
54ceac45 217 .get_sb = nfs_xdev_get_sb,
f7b422b1 218 .kill_sb = nfs_kill_super,
349457cc 219 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 220};
221
ee9b6d61 222static const struct super_operations nfs_sops = {
f7b422b1
DH		 223 .alloc_inode = nfs_alloc_inode,
224 .destroy_inode = nfs_destroy_inode,
225 .write_inode = nfs_write_inode,
226 .statfs = nfs_statfs,
227 .clear_inode = nfs_clear_inode,
228 .umount_begin = nfs_umount_begin,
229 .show_options = nfs_show_options,
230 .show_stats = nfs_show_stats,
231};
232
233#ifdef CONFIG_NFS_V4
816724e6
TM		 234static int nfs4_get_sb(struct file_system_type *fs_type,
235 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
54ceac45
DH		 236static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
237 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
238static int nfs4_referral_get_sb(struct file_system_type *fs_type,
239 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
f7b422b1
DH		 240static void nfs4_kill_super(struct super_block *sb);
241
242static struct file_system_type nfs4_fs_type = {
243 .owner = THIS_MODULE,
244 .name = "nfs4",
245 .get_sb = nfs4_get_sb,
246 .kill_sb = nfs4_kill_super,
349457cc 247 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 248};
249
54ceac45 250struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 251 .owner = THIS_MODULE,
252 .name = "nfs4",
54ceac45 253 .get_sb = nfs4_xdev_get_sb,
f7b422b1 254 .kill_sb = nfs4_kill_super,
349457cc 255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 256};
257
54ceac45 258struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 259 .owner = THIS_MODULE,
260 .name = "nfs4",
54ceac45 261 .get_sb = nfs4_referral_get_sb,
f7b422b1 262 .kill_sb = nfs4_kill_super,
349457cc 263 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 264};
265
ee9b6d61 266static const struct super_operations nfs4_sops = {
f7b422b1
DH		 267 .alloc_inode = nfs_alloc_inode,
268 .destroy_inode = nfs_destroy_inode,
269 .write_inode = nfs_write_inode,
270 .statfs = nfs_statfs,
271 .clear_inode = nfs4_clear_inode,
272 .umount_begin = nfs_umount_begin,
273 .show_options = nfs_show_options,
274 .show_stats = nfs_show_stats,
275};
276#endif
277
8e1f936b
RR		 278static struct shrinker acl_shrinker = {
279 .shrink = nfs_access_cache_shrinker,
280 .seeks = DEFAULT_SEEKS,
281};
979df72e 282
f7b422b1
DH		 283/*
284 * Register the NFS filesystems
285 */
286int __init register_nfs_fs(void)
287{
288 int ret;
289
290 ret = register_filesystem(&nfs_fs_type);
291 if (ret < 0)
292 goto error_0;
293
f7b422b1
DH		 294 ret = nfs_register_sysctl();
295 if (ret < 0)
296 goto error_1;
89a09141 297#ifdef CONFIG_NFS_V4
f7b422b1
DH		 298 ret = register_filesystem(&nfs4_fs_type);
299 if (ret < 0)
300 goto error_2;
301#endif
8e1f936b 302 register_shrinker(&acl_shrinker);
f7b422b1
DH		 303 return 0;
304
305#ifdef CONFIG_NFS_V4
306error_2:
307 nfs_unregister_sysctl();
89a09141 308#endif
f7b422b1
DH		 309error_1:
310 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 311error_0:
312 return ret;
313}
314
315/*
316 * Unregister the NFS filesystems
317 */
318void __exit unregister_nfs_fs(void)
319{
8e1f936b 320 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 321#ifdef CONFIG_NFS_V4
322 unregister_filesystem(&nfs4_fs_type);
f7b422b1 323#endif
49af7ee1 324 nfs_unregister_sysctl();
f7b422b1
DH		 325 unregister_filesystem(&nfs_fs_type);
326}
327
328/*
329 * Deliver file system statistics to userspace
330 */
816724e6 331static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 332{
0c7d90cf 333 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 334 unsigned char blockbits;
335 unsigned long blockres;
0c7d90cf 336 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
f7b422b1
DH		 337 struct nfs_fattr fattr;
338 struct nfs_fsstat res = {
339 .fattr = &fattr,
340 };
341 int error;
342
343 lock_kernel();
344
8fa5c000 345 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
f7b422b1
DH		 346 if (error < 0)
347 goto out_err;
1a0ba9ae 348 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 349
350 /*
351 * Current versions of glibc do not correctly handle the
352 * case where f_frsize != f_bsize. Eventually we want to
353 * report the value of wtmult in this field.
354 */
0c7d90cf 355 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 356
357 /*
358 * On most *nix systems, f_blocks, f_bfree, and f_bavail
359 * are reported in units of f_frsize. Linux hasn't had
360 * an f_frsize field in its statfs struct until recently,
361 * thus historically Linux's sys_statfs reports these
362 * fields in units of f_bsize.
363 */
0c7d90cf
DH		 364 buf->f_bsize = dentry->d_sb->s_blocksize;
365 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 366 blockres = (1 << blockbits) - 1;
367 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
368 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
369 buf->f_bavail = (res.abytes + blockres) >> blockbits;
370
371 buf->f_files = res.tfiles;
372 buf->f_ffree = res.afiles;
373
374 buf->f_namelen = server->namelen;
1a0ba9ae 375
f7b422b1
DH		 376 unlock_kernel();
377 return 0;
378
379 out_err:
380 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
1a0ba9ae
AA		 381 unlock_kernel();
382 return error;
f7b422b1
DH		 383}
384
7d4e2747
DH		 385/*
386 * Map the security flavour number to a name
387 */
81039f1f
TM		 388static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
389{
7d4e2747 390 static const struct {
81039f1f
TM		 391 rpc_authflavor_t flavour;
392 const char *str;
393 } sec_flavours[] = {
394 { RPC_AUTH_NULL, "null" },
395 { RPC_AUTH_UNIX, "sys" },
396 { RPC_AUTH_GSS_KRB5, "krb5" },
397 { RPC_AUTH_GSS_KRB5I, "krb5i" },
398 { RPC_AUTH_GSS_KRB5P, "krb5p" },
399 { RPC_AUTH_GSS_LKEY, "lkey" },
400 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
401 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
402 { RPC_AUTH_GSS_SPKM, "spkm" },
403 { RPC_AUTH_GSS_SPKMI, "spkmi" },
404 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 405 { UINT_MAX, "unknown" }
81039f1f
TM		 406 };
407 int i;
408
4d81cd16 409 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 410 if (sec_flavours[i].flavour == flavour)
411 break;
412 }
413 return sec_flavours[i].str;
414}
415
f7b422b1
DH		 416/*
417 * Describe the mount options in force on this server representation
418 */
419static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
420{
509de811 421 static const struct proc_nfs_info {
f7b422b1 422 int flag;
509de811
DH		 423 const char *str;
424 const char *nostr;
f7b422b1
DH		 425 } nfs_info[] = {
426 { NFS_MOUNT_SOFT, ",soft", ",hard" },
bcf35617 427 { NFS_MOUNT_INTR, ",intr", ",nointr" },
f7b422b1
DH		 428 { NFS_MOUNT_NOCTO, ",nocto", "" },
429 { NFS_MOUNT_NOAC, ",noac", "" },
430 { NFS_MOUNT_NONLM, ",nolock", "" },
431 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 432 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
75180df2 433 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
f7b422b1
DH		 434 { 0, NULL, NULL }
435 };
509de811 436 const struct proc_nfs_info *nfs_infop;
8fa5c000 437 struct nfs_client *clp = nfss->nfs_client;
f7b422b1 438
8fa5c000 439 seq_printf(m, ",vers=%d", clp->rpc_ops->version);
f7b422b1
DH		 440 seq_printf(m, ",rsize=%d", nfss->rsize);
441 seq_printf(m, ",wsize=%d", nfss->wsize);
442 if (nfss->acregmin != 3*HZ || showdefaults)
443 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
444 if (nfss->acregmax != 60*HZ || showdefaults)
445 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
446 if (nfss->acdirmin != 30*HZ || showdefaults)
447 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
448 if (nfss->acdirmax != 60*HZ || showdefaults)
449 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
450 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
451 if (nfss->flags & nfs_infop->flag)
452 seq_puts(m, nfs_infop->str);
453 else
454 seq_puts(m, nfs_infop->nostr);
455 }
56928edd
TT		 456 seq_printf(m, ",proto=%s",
457 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
5006a76c
DH		 458 seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
459 seq_printf(m, ",retrans=%u", clp->retrans_count);
81039f1f 460 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
f7b422b1
DH		 461}
462
463/*
464 * Describe the mount options on this VFS mountpoint
465 */
466static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
467{
468 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
469
470 nfs_show_mount_options(m, nfss, 0);
471
ddc01c08
JL		 472 seq_printf(m, ",addr="NIPQUAD_FMT,
473 NIPQUAD(nfss->nfs_client->cl_addr.sin_addr));
f7b422b1
DH		 474
475 return 0;
476}
477
478/*
479 * Present statistical information for this VFS mountpoint
480 */
481static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
482{
483 int i, cpu;
484 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
485 struct rpc_auth *auth = nfss->client->cl_auth;
486 struct nfs_iostats totals = { };
487
488 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
489
490 /*
491 * Display all mount option settings
492 */
493 seq_printf(m, "\n\topts:\t");
494 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
495 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
496 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
497 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
498 nfs_show_mount_options(m, nfss, 1);
499
500 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
501
502 seq_printf(m, "\n\tcaps:\t");
503 seq_printf(m, "caps=0x%x", nfss->caps);
504 seq_printf(m, ",wtmult=%d", nfss->wtmult);
505 seq_printf(m, ",dtsize=%d", nfss->dtsize);
506 seq_printf(m, ",bsize=%d", nfss->bsize);
507 seq_printf(m, ",namelen=%d", nfss->namelen);
508
509#ifdef CONFIG_NFS_V4
8fa5c000 510 if (nfss->nfs_client->cl_nfsversion == 4) {
f7b422b1
DH		 511 seq_printf(m, "\n\tnfsv4:\t");
512 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
513 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
514 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
515 }
516#endif
517
518 /*
519 * Display security flavor in effect for this mount
520 */
521 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
522 if (auth->au_flavor)
523 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
524
525 /*
526 * Display superblock I/O counters
527 */
528 for_each_possible_cpu(cpu) {
529 struct nfs_iostats *stats;
530
531 preempt_disable();
532 stats = per_cpu_ptr(nfss->io_stats, cpu);
533
534 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
535 totals.events[i] += stats->events[i];
536 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
537 totals.bytes[i] += stats->bytes[i];
538
539 preempt_enable();
540 }
541
542 seq_printf(m, "\n\tevents:\t");
543 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
544 seq_printf(m, "%lu ", totals.events[i]);
545 seq_printf(m, "\n\tbytes:\t");
546 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
547 seq_printf(m, "%Lu ", totals.bytes[i]);
548 seq_printf(m, "\n");
549
550 rpc_print_iostats(m, nfss->client);
551
552 return 0;
553}
554
555/*
556 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 557 * in response to xdev traversals and referrals
f7b422b1
DH		 558 */
559static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
560{
fc6ae3cf
TM		 561 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
562 struct rpc_clnt *rpc;
563
f7b422b1 564 shrink_submounts(vfsmnt, &nfs_automount_list);
fc6ae3cf
TM		 565
566 if (!(flags & MNT_FORCE))
567 return;
568 /* -EIO all pending I/O */
569 rpc = server->client_acl;
570 if (!IS_ERR(rpc))
571 rpc_killall_tasks(rpc);
572 rpc = server->client;
573 if (!IS_ERR(rpc))
574 rpc_killall_tasks(rpc);
f7b422b1
DH		 575}
576
fc50d58f
CL		 577/*
578 * Sanity-check a server address provided by the mount command
579 */
580static int nfs_verify_server_address(struct sockaddr *addr)
581{
582 switch (addr->sa_family) {
583 case AF_INET: {
584 struct sockaddr_in *sa = (struct sockaddr_in *) addr;
585 if (sa->sin_addr.s_addr != INADDR_ANY)
586 return 1;
587 break;
588 }
589 }
590
591 return 0;
592}
593
bf0fd768
CL		 594/*
595 * Error-check and convert a string of mount options from user space into
596 * a data structure
597 */
598static int nfs_parse_mount_options(char *raw,
599 struct nfs_parsed_mount_data *mnt)
600{
601 char *p, *string;
602
603 if (!raw) {
604 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
605 return 1;
606 }
607 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
608
609 while ((p = strsep(&raw, ",")) != NULL) {
610 substring_t args[MAX_OPT_ARGS];
611 int option, token;
612
613 if (!*p)
614 continue;
615
616 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
617
618 token = match_token(p, nfs_mount_option_tokens, args);
619 switch (token) {
620 case Opt_soft:
621 mnt->flags |= NFS_MOUNT_SOFT;
622 break;
623 case Opt_hard:
624 mnt->flags &= ~NFS_MOUNT_SOFT;
625 break;
626 case Opt_intr:
627 mnt->flags |= NFS_MOUNT_INTR;
628 break;
629 case Opt_nointr:
630 mnt->flags &= ~NFS_MOUNT_INTR;
631 break;
632 case Opt_posix:
633 mnt->flags |= NFS_MOUNT_POSIX;
634 break;
635 case Opt_noposix:
636 mnt->flags &= ~NFS_MOUNT_POSIX;
637 break;
638 case Opt_cto:
639 mnt->flags &= ~NFS_MOUNT_NOCTO;
640 break;
641 case Opt_nocto:
642 mnt->flags |= NFS_MOUNT_NOCTO;
643 break;
644 case Opt_ac:
645 mnt->flags &= ~NFS_MOUNT_NOAC;
646 break;
647 case Opt_noac:
648 mnt->flags |= NFS_MOUNT_NOAC;
649 break;
650 case Opt_lock:
651 mnt->flags &= ~NFS_MOUNT_NONLM;
652 break;
653 case Opt_nolock:
654 mnt->flags |= NFS_MOUNT_NONLM;
655 break;
656 case Opt_v2:
657 mnt->flags &= ~NFS_MOUNT_VER3;
658 break;
659 case Opt_v3:
660 mnt->flags |= NFS_MOUNT_VER3;
661 break;
662 case Opt_udp:
663 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 664 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 665 mnt->timeo = 7;
666 mnt->retrans = 5;
667 break;
668 case Opt_tcp:
669 mnt->flags |= NFS_MOUNT_TCP;
0896a725 670 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768
CL		 671 mnt->timeo = 600;
672 mnt->retrans = 2;
673 break;
2cf7ff7a
TT		 674 case Opt_rdma:
675 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
676 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
677 mnt->timeo = 600;
678 mnt->retrans = 2;
679 break;
bf0fd768
CL		 680 case Opt_acl:
681 mnt->flags &= ~NFS_MOUNT_NOACL;
682 break;
683 case Opt_noacl:
684 mnt->flags |= NFS_MOUNT_NOACL;
685 break;
686 case Opt_rdirplus:
687 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
688 break;
689 case Opt_nordirplus:
690 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
691 break;
75180df2
TM		 692 case Opt_sharecache:
693 mnt->flags &= ~NFS_MOUNT_UNSHARED;
694 break;
695 case Opt_nosharecache:
696 mnt->flags |= NFS_MOUNT_UNSHARED;
697 break;
bf0fd768
CL		 698
699 case Opt_port:
700 if (match_int(args, &option))
701 return 0;
702 if (option < 0 || option > 65535)
703 return 0;
41089644 704 mnt->nfs_server.address.sin_port = htons(option);
bf0fd768
CL		 705 break;
706 case Opt_rsize:
707 if (match_int(args, &mnt->rsize))
708 return 0;
709 break;
710 case Opt_wsize:
711 if (match_int(args, &mnt->wsize))
712 return 0;
713 break;
714 case Opt_bsize:
715 if (match_int(args, &option))
716 return 0;
717 if (option < 0)
718 return 0;
719 mnt->bsize = option;
720 break;
721 case Opt_timeo:
722 if (match_int(args, &mnt->timeo))
723 return 0;
724 break;
725 case Opt_retrans:
726 if (match_int(args, &mnt->retrans))
727 return 0;
728 break;
729 case Opt_acregmin:
730 if (match_int(args, &mnt->acregmin))
731 return 0;
732 break;
733 case Opt_acregmax:
734 if (match_int(args, &mnt->acregmax))
735 return 0;
736 break;
737 case Opt_acdirmin:
738 if (match_int(args, &mnt->acdirmin))
739 return 0;
740 break;
741 case Opt_acdirmax:
742 if (match_int(args, &mnt->acdirmax))
743 return 0;
744 break;
745 case Opt_actimeo:
746 if (match_int(args, &option))
747 return 0;
748 if (option < 0)
749 return 0;
750 mnt->acregmin =
751 mnt->acregmax =
752 mnt->acdirmin =
753 mnt->acdirmax = option;
754 break;
755 case Opt_namelen:
756 if (match_int(args, &mnt->namlen))
757 return 0;
758 break;
759 case Opt_mountport:
760 if (match_int(args, &option))
761 return 0;
762 if (option < 0 || option > 65535)
763 return 0;
764 mnt->mount_server.port = option;
765 break;
766 case Opt_mountprog:
767 if (match_int(args, &option))
768 return 0;
769 if (option < 0)
770 return 0;
771 mnt->mount_server.program = option;
772 break;
773 case Opt_mountvers:
774 if (match_int(args, &option))
775 return 0;
776 if (option < 0)
777 return 0;
778 mnt->mount_server.version = option;
779 break;
780 case Opt_nfsprog:
781 if (match_int(args, &option))
782 return 0;
783 if (option < 0)
784 return 0;
785 mnt->nfs_server.program = option;
786 break;
787 case Opt_nfsvers:
788 if (match_int(args, &option))
789 return 0;
790 switch (option) {
791 case 2:
792 mnt->flags &= ~NFS_MOUNT_VER3;
793 break;
794 case 3:
795 mnt->flags |= NFS_MOUNT_VER3;
796 break;
797 default:
798 goto out_unrec_vers;
799 }
800 break;
801
802 case Opt_sec:
803 string = match_strdup(args);
804 if (string == NULL)
805 goto out_nomem;
806 token = match_token(string, nfs_secflavor_tokens, args);
807 kfree(string);
808
809 /*
810 * The flags setting is for v2/v3. The flavor_len
811 * setting is for v4. v2/v3 also need to know the
812 * difference between NULL and UNIX.
813 */
814 switch (token) {
815 case Opt_sec_none:
816 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
817 mnt->auth_flavor_len = 0;
818 mnt->auth_flavors[0] = RPC_AUTH_NULL;
819 break;
820 case Opt_sec_sys:
821 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
822 mnt->auth_flavor_len = 0;
823 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
824 break;
825 case Opt_sec_krb5:
826 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
827 mnt->auth_flavor_len = 1;
828 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
829 break;
830 case Opt_sec_krb5i:
831 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
832 mnt->auth_flavor_len = 1;
833 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
834 break;
835 case Opt_sec_krb5p:
836 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
837 mnt->auth_flavor_len = 1;
838 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
839 break;
840 case Opt_sec_lkey:
841 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
842 mnt->auth_flavor_len = 1;
843 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
844 break;
845 case Opt_sec_lkeyi:
846 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
847 mnt->auth_flavor_len = 1;
848 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
849 break;
850 case Opt_sec_lkeyp:
851 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
852 mnt->auth_flavor_len = 1;
853 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
854 break;
855 case Opt_sec_spkm:
856 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
857 mnt->auth_flavor_len = 1;
858 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
859 break;
860 case Opt_sec_spkmi:
861 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
862 mnt->auth_flavor_len = 1;
863 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
864 break;
865 case Opt_sec_spkmp:
866 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
867 mnt->auth_flavor_len = 1;
868 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
869 break;
870 default:
871 goto out_unrec_sec;
872 }
873 break;
874 case Opt_proto:
875 string = match_strdup(args);
876 if (string == NULL)
877 goto out_nomem;
878 token = match_token(string,
879 nfs_xprt_protocol_tokens, args);
880 kfree(string);
881
882 switch (token) {
fdb66ff4 883 case Opt_xprt_udp:
bf0fd768 884 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 885 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 886 mnt->timeo = 7;
887 mnt->retrans = 5;
888 break;
fdb66ff4 889 case Opt_xprt_tcp:
bf0fd768 890 mnt->flags |= NFS_MOUNT_TCP;
0896a725 891 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768
CL		 892 mnt->timeo = 600;
893 mnt->retrans = 2;
894 break;
2cf7ff7a
TT		 895 case Opt_xprt_rdma:
896 /* vector side protocols to TCP */
897 mnt->flags |= NFS_MOUNT_TCP;
898 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
899 mnt->timeo = 600;
900 mnt->retrans = 2;
901 break;
bf0fd768
CL		 902 default:
903 goto out_unrec_xprt;
904 }
905 break;
906 case Opt_mountproto:
907 string = match_strdup(args);
908 if (string == NULL)
909 goto out_nomem;
910 token = match_token(string,
911 nfs_xprt_protocol_tokens, args);
912 kfree(string);
913
914 switch (token) {
fdb66ff4 915 case Opt_xprt_udp:
0896a725 916 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 917 break;
fdb66ff4 918 case Opt_xprt_tcp:
0896a725 919 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 920 break;
2cf7ff7a 921 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768
CL		 922 default:
923 goto out_unrec_xprt;
924 }
925 break;
926 case Opt_addr:
927 string = match_strdup(args);
928 if (string == NULL)
929 goto out_nomem;
930 mnt->nfs_server.address.sin_family = AF_INET;
931 mnt->nfs_server.address.sin_addr.s_addr =
932 in_aton(string);
933 kfree(string);
934 break;
935 case Opt_clientaddr:
936 string = match_strdup(args);
937 if (string == NULL)
938 goto out_nomem;
939 mnt->client_address = string;
940 break;
0ac83779 941 case Opt_mountaddr:
bf0fd768
CL		 942 string = match_strdup(args);
943 if (string == NULL)
944 goto out_nomem;
945 mnt->mount_server.address.sin_family = AF_INET;
946 mnt->mount_server.address.sin_addr.s_addr =
947 in_aton(string);
948 kfree(string);
949 break;
950
951 case Opt_userspace:
952 case Opt_deprecated:
953 break;
954
955 default:
956 goto out_unknown;
957 }
958 }
959
960 return 1;
961
962out_nomem:
963 printk(KERN_INFO "NFS: not enough memory to parse option\n");
964 return 0;
965
966out_unrec_vers:
967 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
968 return 0;
969
970out_unrec_xprt:
971 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
972 return 0;
973
974out_unrec_sec:
975 printk(KERN_INFO "NFS: unrecognized security flavor\n");
976 return 0;
977
978out_unknown:
979 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
980 return 0;
981}
982
0076d7b7
CL		 983/*
984 * Use the remote server's MOUNT service to request the NFS file handle
985 * corresponding to the provided path.
986 */
987static int nfs_try_mount(struct nfs_parsed_mount_data *args,
988 struct nfs_fh *root_fh)
989{
990 struct sockaddr_in sin;
991 int status;
992
993 if (args->mount_server.version == 0) {
994 if (args->flags & NFS_MOUNT_VER3)
995 args->mount_server.version = NFS_MNT3_VERSION;
996 else
997 args->mount_server.version = NFS_MNT_VERSION;
998 }
999
1000 /*
1001 * Construct the mount server's address.
1002 */
1003 if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY)
1004 sin = args->mount_server.address;
1005 else
1006 sin = args->nfs_server.address;
aad70007
JL		 1007 /*
1008 * autobind will be used if mount_server.port == 0
1009 */
1010 sin.sin_port = htons(args->mount_server.port);
0076d7b7
CL		 1011
1012 /*
1013 * Now ask the mount server to map our export path
1014 * to a file handle.
1015 */
1016 status = nfs_mount((struct sockaddr *) &sin,
1017 sizeof(sin),
1018 args->nfs_server.hostname,
1019 args->nfs_server.export_path,
1020 args->mount_server.version,
1021 args->mount_server.protocol,
1022 root_fh);
efd8340b
CL		 1023 if (status == 0)
1024 return 0;
0076d7b7 1025
efd8340b
CL		 1026 dfprintk(MOUNT, "NFS: unable to mount server " NIPQUAD_FMT
1027 ", error %d\n", NIPQUAD(sin.sin_addr.s_addr), status);
0076d7b7
CL		 1028 return status;
1029}
1030
f7b422b1 1031/*
54ceac45
DH		 1032 * Validate the NFS2/NFS3 mount data
1033 * - fills in the mount root filehandle
136d558c
CL		 1034 *
1035 * For option strings, user space handles the following behaviors:
1036 *
1037 * + DNS: mapping server host name to IP address ("addr=" option)
1038 *
1039 * + failure mode: how to behave if a mount request can't be handled
1040 * immediately ("fg/bg" option)
1041 *
1042 * + retry: how often to retry a mount request ("retry=" option)
1043 *
1044 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1045 * mountproto=tcp after mountproto=udp, and so on
1046 *
1047 * XXX: as far as I can tell, changing the NFS program number is not
1048 * supported in the NFS client.
f7b422b1 1049 */
2283f8d6
TT		 1050static int nfs_validate_mount_data(void *options,
1051 struct nfs_parsed_mount_data *args,
136d558c
CL		 1052 struct nfs_fh *mntfh,
1053 const char *dev_name)
f7b422b1 1054{
2283f8d6 1055 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
136d558c 1056
f16c9603
RK		 1057 memset(args, 0, sizeof(*args));
1058
5df36e78
CL		 1059 if (data == NULL)
1060 goto out_no_data;
f7b422b1 1061
2283f8d6
TT		 1062 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1063 args->rsize = NFS_MAX_FILE_IO_SIZE;
1064 args->wsize = NFS_MAX_FILE_IO_SIZE;
1065 args->timeo = 600;
1066 args->retrans = 2;
1067 args->acregmin = 3;
1068 args->acregmax = 60;
1069 args->acdirmin = 30;
1070 args->acdirmax = 60;
0896a725 1071 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6 1072 args->mount_server.program = NFS_MNT_PROGRAM;
0896a725 1073 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
2283f8d6
TT		 1074 args->nfs_server.program = NFS_PROGRAM;
1075
54ceac45 1076 switch (data->version) {
5df36e78
CL		 1077 case 1:
1078 data->namlen = 0;
1079 case 2:
1080 data->bsize = 0;
1081 case 3:
1082 if (data->flags & NFS_MOUNT_VER3)
1083 goto out_no_v3;
1084 data->root.size = NFS2_FHSIZE;
1085 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1086 case 4:
1087 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1088 goto out_no_sec;
1089 case 5:
1090 memset(data->context, 0, sizeof(data->context));
1091 case 6:
1092 if (data->flags & NFS_MOUNT_VER3)
1093 mntfh->size = data->root.size;
1094 else
1095 mntfh->size = NFS2_FHSIZE;
1096
1097 if (mntfh->size > sizeof(mntfh->data))
1098 goto out_invalid_fh;
1099
1100 memcpy(mntfh->data, data->root.data, mntfh->size);
1101 if (mntfh->size < sizeof(mntfh->data))
1102 memset(mntfh->data + mntfh->size, 0,
1103 sizeof(mntfh->data) - mntfh->size);
6e88e061
CL		 1104
1105 if (!nfs_verify_server_address((struct sockaddr *) &data->addr))
1106 goto out_no_address;
1107
2283f8d6
TT		 1108 /*
1109 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1110 * can deal with.
1111 */
1112 args->flags = data->flags;
1113 args->rsize = data->rsize;
1114 args->wsize = data->wsize;
1115 args->flags = data->flags;
1116 args->timeo = data->timeo;
1117 args->retrans = data->retrans;
1118 args->acregmin = data->acregmin;
1119 args->acregmax = data->acregmax;
1120 args->acdirmin = data->acdirmin;
1121 args->acdirmax = data->acdirmax;
1122 args->nfs_server.address = data->addr;
1123 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1124 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1125 /* N.B. caller will free nfs_server.hostname in all cases */
1126 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1127 args->namlen = data->namlen;
1128 args->bsize = data->bsize;
1129 args->auth_flavors[0] = data->pseudoflavor;
5df36e78 1130 break;
136d558c
CL		 1131 default: {
1132 unsigned int len;
1133 char *c;
1134 int status;
136d558c 1135
2283f8d6
TT		 1136 if (nfs_parse_mount_options((char *)options, args) == 0)
1137 return -EINVAL;
136d558c 1138
6e88e061
CL		 1139 if (!nfs_verify_server_address((struct sockaddr *)
1140 &args->nfs_server.address))
1141 goto out_no_address;
1142
136d558c
CL		 1143 c = strchr(dev_name, ':');
1144 if (c == NULL)
1145 return -EINVAL;
350c73af 1146 len = c - dev_name;
2283f8d6
TT		 1147 /* N.B. caller will free nfs_server.hostname in all cases */
1148 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
136d558c
CL		 1149
1150 c++;
1151 if (strlen(c) > NFS_MAXPATHLEN)
7d1cca72 1152 return -ENAMETOOLONG;
2283f8d6 1153 args->nfs_server.export_path = c;
136d558c 1154
2283f8d6 1155 status = nfs_try_mount(args, mntfh);
136d558c 1156 if (status)
fdc6e2c8 1157 return status;
136d558c 1158
136d558c
CL		 1159 break;
1160 }
f7b422b1 1161 }
54ceac45 1162
2283f8d6
TT		 1163 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1164 args->auth_flavors[0] = RPC_AUTH_UNIX;
36b15c54 1165
54ceac45 1166#ifndef CONFIG_NFS_V3
2283f8d6 1167 if (args->flags & NFS_MOUNT_VER3)
5df36e78
CL		 1168 goto out_v3_not_compiled;
1169#endif /* !CONFIG_NFS_V3 */
f7b422b1 1170
5df36e78 1171 return 0;
f7b422b1 1172
5df36e78
CL		 1173out_no_data:
1174 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1175 return -EINVAL;
54ceac45 1176
5df36e78
CL		 1177out_no_v3:
1178 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1179 data->version);
1180 return -EINVAL;
f7b422b1 1181
5df36e78
CL		 1182out_no_sec:
1183 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1184 return -EINVAL;
1185
5df36e78
CL		 1186#ifndef CONFIG_NFS_V3
1187out_v3_not_compiled:
1188 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1189 return -EPROTONOSUPPORT;
1190#endif /* !CONFIG_NFS_V3 */
1191
1192out_no_address:
1193 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1194 return -EINVAL;
1195
1196out_invalid_fh:
1197 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1198 return -EINVAL;
f7b422b1
DH		 1199}
1200
f7b422b1 1201/*
54ceac45 1202 * Initialise the common bits of the superblock
f7b422b1 1203 */
54ceac45 1204static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1205{
54ceac45 1206 struct nfs_server *server = NFS_SB(sb);
5006a76c 1207
54ceac45 1208 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1209
54ceac45
DH		 1210 /* We probably want something more informative here */
1211 snprintf(sb->s_id, sizeof(sb->s_id),
1212 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1213
54ceac45
DH		 1214 if (sb->s_blocksize == 0)
1215 sb->s_blocksize = nfs_block_bits(server->wsize,
1216 &sb->s_blocksize_bits);
f7b422b1 1217
54ceac45
DH		 1218 if (server->flags & NFS_MOUNT_NOAC)
1219 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 1220
54ceac45 1221 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1222}
1223
1224/*
54ceac45 1225 * Finish setting up an NFS2/3 superblock
f7b422b1 1226 */
2283f8d6
TT		 1227static void nfs_fill_super(struct super_block *sb,
1228 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 1229{
1230 struct nfs_server *server = NFS_SB(sb);
5006a76c 1231
54ceac45
DH		 1232 sb->s_blocksize_bits = 0;
1233 sb->s_blocksize = 0;
1234 if (data->bsize)
1235 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 1236
54ceac45
DH		 1237 if (server->flags & NFS_MOUNT_VER3) {
1238 /* The VFS shouldn't apply the umask to mode bits. We will do
1239 * so ourselves when necessary.
1240 */
1241 sb->s_flags |= MS_POSIXACL;
1242 sb->s_time_gran = 1;
816724e6 1243 }
54ceac45
DH		 1244
1245 sb->s_op = &nfs_sops;
1246 nfs_initialise_sb(sb);
f7b422b1
DH		 1247}
1248
1249/*
54ceac45 1250 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 1251 */
54ceac45
DH		 1252static void nfs_clone_super(struct super_block *sb,
1253 const struct super_block *old_sb)
f7b422b1 1254{
54ceac45
DH		 1255 struct nfs_server *server = NFS_SB(sb);
1256
1257 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1258 sb->s_blocksize = old_sb->s_blocksize;
1259 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1260
f7b422b1 1261 if (server->flags & NFS_MOUNT_VER3) {
54ceac45
DH		 1262 /* The VFS shouldn't apply the umask to mode bits. We will do
1263 * so ourselves when necessary.
f7b422b1
DH		 1264 */
1265 sb->s_flags |= MS_POSIXACL;
f7b422b1 1266 sb->s_time_gran = 1;
f7b422b1
DH		 1267 }
1268
54ceac45
DH		 1269 sb->s_op = old_sb->s_op;
1270 nfs_initialise_sb(sb);
f7b422b1
DH		 1271}
1272
275a5d24
TM		 1273#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1274
1275static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1276{
1277 const struct nfs_server *a = s->s_fs_info;
1278 const struct rpc_clnt *clnt_a = a->client;
1279 const struct rpc_clnt *clnt_b = b->client;
1280
1281 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1282 goto Ebusy;
1283 if (a->nfs_client != b->nfs_client)
1284 goto Ebusy;
1285 if (a->flags != b->flags)
1286 goto Ebusy;
1287 if (a->wsize != b->wsize)
1288 goto Ebusy;
1289 if (a->rsize != b->rsize)
1290 goto Ebusy;
1291 if (a->acregmin != b->acregmin)
1292 goto Ebusy;
1293 if (a->acregmax != b->acregmax)
1294 goto Ebusy;
1295 if (a->acdirmin != b->acdirmin)
1296 goto Ebusy;
1297 if (a->acdirmax != b->acdirmax)
1298 goto Ebusy;
1299 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1300 goto Ebusy;
e89a5a43 1301 return 1;
275a5d24 1302Ebusy:
e89a5a43
TM		 1303 return 0;
1304}
1305
1306struct nfs_sb_mountdata {
1307 struct nfs_server *server;
1308 int mntflags;
1309};
1310
1311static int nfs_set_super(struct super_block *s, void *data)
1312{
1313 struct nfs_sb_mountdata *sb_mntdata = data;
1314 struct nfs_server *server = sb_mntdata->server;
1315 int ret;
1316
1317 s->s_flags = sb_mntdata->mntflags;
1318 s->s_fs_info = server;
1319 ret = set_anon_super(s, server);
1320 if (ret == 0)
1321 server->s_dev = s->s_dev;
1322 return ret;
1323}
1324
1325static int nfs_compare_super(struct super_block *sb, void *data)
1326{
1327 struct nfs_sb_mountdata *sb_mntdata = data;
1328 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1329 int mntflags = sb_mntdata->mntflags;
1330
1331 if (memcmp(&old->nfs_client->cl_addr,
1332 &server->nfs_client->cl_addr,
1333 sizeof(old->nfs_client->cl_addr)) != 0)
1334 return 0;
1335 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1336 if (old->flags & NFS_MOUNT_UNSHARED)
1337 return 0;
1338 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1339 return 0;
1340 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 1341}
1342
816724e6
TM		 1343static int nfs_get_sb(struct file_system_type *fs_type,
1344 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 1345{
f7b422b1
DH		 1346 struct nfs_server *server = NULL;
1347 struct super_block *s;
54ceac45 1348 struct nfs_fh mntfh;
2283f8d6 1349 struct nfs_parsed_mount_data data;
54ceac45 1350 struct dentry *mntroot;
75180df2 1351 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1352 struct nfs_sb_mountdata sb_mntdata = {
1353 .mntflags = flags,
1354 };
54ceac45 1355 int error;
f7b422b1 1356
54ceac45 1357 /* Validate the mount data */
2283f8d6 1358 error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
54ceac45 1359 if (error < 0)
0655960f 1360 goto out;
f7b422b1 1361
54ceac45 1362 /* Get a volume representation */
2283f8d6 1363 server = nfs_create_server(&data, &mntfh);
54ceac45
DH		 1364 if (IS_ERR(server)) {
1365 error = PTR_ERR(server);
0655960f 1366 goto out;
f7b422b1 1367 }
e89a5a43 1368 sb_mntdata.server = server;
f7b422b1 1369
75180df2
TM		 1370 if (server->flags & NFS_MOUNT_UNSHARED)
1371 compare_super = NULL;
1372
54ceac45 1373 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 1374 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 1375 if (IS_ERR(s)) {
1376 error = PTR_ERR(s);
54ceac45 1377 goto out_err_nosb;
816724e6
TM		 1378 }
1379
54ceac45
DH		 1380 if (s->s_fs_info != server) {
1381 nfs_free_server(server);
1382 server = NULL;
1383 }
f7b422b1 1384
54ceac45
DH		 1385 if (!s->s_root) {
1386 /* initial superblock/root creation */
2283f8d6 1387 nfs_fill_super(s, &data);
54ceac45 1388 }
f7b422b1 1389
54ceac45
DH		 1390 mntroot = nfs_get_root(s, &mntfh);
1391 if (IS_ERR(mntroot)) {
1392 error = PTR_ERR(mntroot);
1393 goto error_splat_super;
f7b422b1 1394 }
816724e6 1395
54ceac45
DH		 1396 s->s_flags |= MS_ACTIVE;
1397 mnt->mnt_sb = s;
1398 mnt->mnt_root = mntroot;
0655960f
CL		 1399 error = 0;
1400
1401out:
2283f8d6 1402 kfree(data.nfs_server.hostname);
0655960f 1403 return error;
816724e6 1404
54ceac45
DH		 1405out_err_nosb:
1406 nfs_free_server(server);
0655960f 1407 goto out;
54ceac45
DH		 1408
1409error_splat_super:
1410 up_write(&s->s_umount);
1411 deactivate_super(s);
0655960f 1412 goto out;
f7b422b1
DH		 1413}
1414
54ceac45
DH		 1415/*
1416 * Destroy an NFS2/3 superblock
1417 */
f7b422b1
DH		 1418static void nfs_kill_super(struct super_block *s)
1419{
1420 struct nfs_server *server = NFS_SB(s);
1421
1422 kill_anon_super(s);
54ceac45 1423 nfs_free_server(server);
f7b422b1
DH		 1424}
1425
54ceac45
DH		 1426/*
1427 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1428 */
1429static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1430 const char *dev_name, void *raw_data,
1431 struct vfsmount *mnt)
f7b422b1
DH		 1432{
1433 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 1434 struct super_block *s;
1435 struct nfs_server *server;
1436 struct dentry *mntroot;
75180df2 1437 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1438 struct nfs_sb_mountdata sb_mntdata = {
1439 .mntflags = flags,
1440 };
54ceac45 1441 int error;
f7b422b1 1442
54ceac45 1443 dprintk("--> nfs_xdev_get_sb()\n");
f7b422b1 1444
54ceac45
DH		 1445 /* create a new volume representation */
1446 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1447 if (IS_ERR(server)) {
1448 error = PTR_ERR(server);
1449 goto out_err_noserver;
1450 }
e89a5a43 1451 sb_mntdata.server = server;
8fa5c000 1452
75180df2
TM		 1453 if (server->flags & NFS_MOUNT_UNSHARED)
1454 compare_super = NULL;
1455
54ceac45 1456 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 1457 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 1458 if (IS_ERR(s)) {
1459 error = PTR_ERR(s);
1460 goto out_err_nosb;
1461 }
5006a76c 1462
54ceac45
DH		 1463 if (s->s_fs_info != server) {
1464 nfs_free_server(server);
1465 server = NULL;
f7b422b1 1466 }
24c8dbbb 1467
54ceac45
DH		 1468 if (!s->s_root) {
1469 /* initial superblock/root creation */
54ceac45
DH		 1470 nfs_clone_super(s, data->sb);
1471 }
f7b422b1 1472
54ceac45
DH		 1473 mntroot = nfs_get_root(s, data->fh);
1474 if (IS_ERR(mntroot)) {
1475 error = PTR_ERR(mntroot);
1476 goto error_splat_super;
f7b422b1 1477 }
e9cc6c23 1478 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 1479 dput(mntroot);
1480 error = -ESTALE;
1481 goto error_splat_super;
1482 }
f7b422b1 1483
54ceac45
DH		 1484 s->s_flags |= MS_ACTIVE;
1485 mnt->mnt_sb = s;
1486 mnt->mnt_root = mntroot;
f7b422b1 1487
54ceac45
DH		 1488 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1489 return 0;
24c8dbbb 1490
54ceac45
DH		 1491out_err_nosb:
1492 nfs_free_server(server);
1493out_err_noserver:
1494 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1495 return error;
f7b422b1 1496
54ceac45
DH		 1497error_splat_super:
1498 up_write(&s->s_umount);
1499 deactivate_super(s);
1500 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1501 return error;
f7b422b1
DH		 1502}
1503
54ceac45
DH		 1504#ifdef CONFIG_NFS_V4
1505
f7b422b1 1506/*
54ceac45 1507 * Finish setting up a cloned NFS4 superblock
f7b422b1 1508 */
54ceac45
DH		 1509static void nfs4_clone_super(struct super_block *sb,
1510 const struct super_block *old_sb)
f7b422b1 1511{
54ceac45
DH		 1512 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1513 sb->s_blocksize = old_sb->s_blocksize;
1514 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 1515 sb->s_time_gran = 1;
54ceac45
DH		 1516 sb->s_op = old_sb->s_op;
1517 nfs_initialise_sb(sb);
f7b422b1
DH		 1518}
1519
54ceac45
DH		 1520/*
1521 * Set up an NFS4 superblock
1522 */
1523static void nfs4_fill_super(struct super_block *sb)
f7b422b1 1524{
54ceac45
DH		 1525 sb->s_time_gran = 1;
1526 sb->s_op = &nfs4_sops;
1527 nfs_initialise_sb(sb);
f7b422b1
DH		 1528}
1529
f0768ebd
CL		 1530/*
1531 * Validate NFSv4 mount options
1532 */
91ea40b9
TT		 1533static int nfs4_validate_mount_data(void *options,
1534 struct nfs_parsed_mount_data *args,
1535 const char *dev_name)
f0768ebd 1536{
91ea40b9 1537 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 1538 char *c;
1539
f16c9603
RK		 1540 memset(args, 0, sizeof(*args));
1541
f0768ebd
CL		 1542 if (data == NULL)
1543 goto out_no_data;
1544
91ea40b9
TT		 1545 args->rsize = NFS_MAX_FILE_IO_SIZE;
1546 args->wsize = NFS_MAX_FILE_IO_SIZE;
1547 args->timeo = 600;
1548 args->retrans = 2;
1549 args->acregmin = 3;
1550 args->acregmax = 60;
1551 args->acdirmin = 30;
1552 args->acdirmax = 60;
0896a725 1553 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
91ea40b9 1554
f0768ebd
CL		 1555 switch (data->version) {
1556 case 1:
91ea40b9 1557 if (data->host_addrlen != sizeof(args->nfs_server.address))
f0768ebd 1558 goto out_no_address;
91ea40b9
TT		 1559 if (copy_from_user(&args->nfs_server.address,
1560 data->host_addr,
20c71f5e 1561 sizeof(args->nfs_server.address)))
f0768ebd 1562 return -EFAULT;
91ea40b9
TT		 1563 if (args->nfs_server.address.sin_port == 0)
1564 args->nfs_server.address.sin_port = htons(NFS_PORT);
1565 if (!nfs_verify_server_address((struct sockaddr *)
1566 &args->nfs_server.address))
f0768ebd
CL		 1567 goto out_no_address;
1568
1569 switch (data->auth_flavourlen) {
1570 case 0:
91ea40b9 1571 args->auth_flavors[0] = RPC_AUTH_UNIX;
f0768ebd
CL		 1572 break;
1573 case 1:
20c71f5e 1574 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 1575 data->auth_flavours,
20c71f5e 1576 sizeof(args->auth_flavors[0])))
f0768ebd
CL		 1577 return -EFAULT;
1578 break;
1579 default:
1580 goto out_inval_auth;
1581 }
1582
1583 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1584 if (IS_ERR(c))
1585 return PTR_ERR(c);
91ea40b9 1586 args->nfs_server.hostname = c;
f0768ebd
CL		 1587
1588 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1589 if (IS_ERR(c))
1590 return PTR_ERR(c);
91ea40b9
TT		 1591 args->nfs_server.export_path = c;
1592 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 1593
1594 c = strndup_user(data->client_addr.data, 16);
1595 if (IS_ERR(c))
1596 return PTR_ERR(c);
91ea40b9
TT		 1597 args->client_address = c;
1598
1599 /*
1600 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1601 * can deal with.
1602 */
1603
1604 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1605 args->rsize = data->rsize;
1606 args->wsize = data->wsize;
1607 args->timeo = data->timeo;
1608 args->retrans = data->retrans;
1609 args->acregmin = data->acregmin;
1610 args->acregmax = data->acregmax;
1611 args->acdirmin = data->acdirmin;
1612 args->acdirmax = data->acdirmax;
1613 args->nfs_server.protocol = data->proto;
f0768ebd
CL		 1614
1615 break;
80071225
CL		 1616 default: {
1617 unsigned int len;
91ea40b9
TT		 1618
1619 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 1620 return -EINVAL;
1621
1622 if (!nfs_verify_server_address((struct sockaddr *)
91ea40b9 1623 &args->nfs_server.address))
80071225 1624 return -EINVAL;
80071225 1625
91ea40b9 1626 switch (args->auth_flavor_len) {
80071225 1627 case 0:
91ea40b9 1628 args->auth_flavors[0] = RPC_AUTH_UNIX;
80071225
CL		 1629 break;
1630 case 1:
80071225
CL		 1631 break;
1632 default:
1633 goto out_inval_auth;
1634 }
1635
80071225
CL		 1636 /*
1637 * Split "dev_name" into "hostname:mntpath".
1638 */
1639 c = strchr(dev_name, ':');
1640 if (c == NULL)
1641 return -EINVAL;
1642 /* while calculating len, pretend ':' is '\0' */
1643 len = c - dev_name;
1644 if (len > NFS4_MAXNAMLEN)
7d1cca72 1645 return -ENAMETOOLONG;
91ea40b9
TT		 1646 args->nfs_server.hostname = kzalloc(len, GFP_KERNEL);
1647 if (args->nfs_server.hostname == NULL)
80071225 1648 return -ENOMEM;
91ea40b9 1649 strncpy(args->nfs_server.hostname, dev_name, len - 1);
80071225
CL		 1650
1651 c++; /* step over the ':' */
1652 len = strlen(c);
1653 if (len > NFS4_MAXPATHLEN)
7d1cca72 1654 return -ENAMETOOLONG;
91ea40b9
TT		 1655 args->nfs_server.export_path = kzalloc(len + 1, GFP_KERNEL);
1656 if (args->nfs_server.export_path == NULL)
80071225 1657 return -ENOMEM;
91ea40b9 1658 strncpy(args->nfs_server.export_path, c, len);
80071225 1659
91ea40b9 1660 dprintk("MNTPATH: %s\n", args->nfs_server.export_path);
80071225 1661
91ea40b9 1662 if (args->client_address == NULL)
0a87cf12
JL		 1663 goto out_no_client_address;
1664
80071225
CL		 1665 break;
1666 }
f0768ebd
CL		 1667 }
1668
1669 return 0;
1670
1671out_no_data:
1672 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1673 return -EINVAL;
1674
1675out_inval_auth:
1676 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1677 data->auth_flavourlen);
1678 return -EINVAL;
1679
1680out_no_address:
1681 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1682 return -EINVAL;
0a87cf12
JL		 1683
1684out_no_client_address:
1685 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1686 return -EINVAL;
f0768ebd
CL		 1687}
1688
54ceac45
DH		 1689/*
1690 * Get the superblock for an NFS4 mountpoint
1691 */
816724e6
TM		 1692static int nfs4_get_sb(struct file_system_type *fs_type,
1693 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
f7b422b1 1694{
91ea40b9 1695 struct nfs_parsed_mount_data data;
54ceac45
DH		 1696 struct super_block *s;
1697 struct nfs_server *server;
54ceac45
DH		 1698 struct nfs_fh mntfh;
1699 struct dentry *mntroot;
75180df2 1700 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1701 struct nfs_sb_mountdata sb_mntdata = {
1702 .mntflags = flags,
1703 };
54ceac45 1704 int error;
f7b422b1 1705
f0768ebd 1706 /* Validate the mount data */
91ea40b9 1707 error = nfs4_validate_mount_data(raw_data, &data, dev_name);
f0768ebd
CL		 1708 if (error < 0)
1709 goto out;
f7b422b1 1710
54ceac45 1711 /* Get a volume representation */
91ea40b9 1712 server = nfs4_create_server(&data, &mntfh);
54ceac45
DH		 1713 if (IS_ERR(server)) {
1714 error = PTR_ERR(server);
29eb981a 1715 goto out;
f7b422b1 1716 }
e89a5a43 1717 sb_mntdata.server = server;
f7b422b1 1718
75180df2
TM		 1719 if (server->flags & NFS4_MOUNT_UNSHARED)
1720 compare_super = NULL;
1721
54ceac45 1722 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 1723 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 1724 if (IS_ERR(s)) {
1725 error = PTR_ERR(s);
f7b422b1 1726 goto out_free;
816724e6
TM		 1727 }
1728
5dd3177a
TM		 1729 if (s->s_fs_info != server) {
1730 nfs_free_server(server);
1731 server = NULL;
1732 }
1733
54ceac45
DH		 1734 if (!s->s_root) {
1735 /* initial superblock/root creation */
54ceac45 1736 nfs4_fill_super(s);
54ceac45 1737 }
f7b422b1 1738
54ceac45
DH		 1739 mntroot = nfs4_get_root(s, &mntfh);
1740 if (IS_ERR(mntroot)) {
1741 error = PTR_ERR(mntroot);
1742 goto error_splat_super;
f7b422b1 1743 }
54ceac45 1744
f7b422b1 1745 s->s_flags |= MS_ACTIVE;
54ceac45
DH		 1746 mnt->mnt_sb = s;
1747 mnt->mnt_root = mntroot;
29eb981a
CL		 1748 error = 0;
1749
1750out:
91ea40b9
TT		 1751 kfree(data.client_address);
1752 kfree(data.nfs_server.export_path);
1753 kfree(data.nfs_server.hostname);
29eb981a 1754 return error;
54ceac45 1755
f7b422b1 1756out_free:
54ceac45 1757 nfs_free_server(server);
29eb981a 1758 goto out;
54ceac45
DH		 1759
1760error_splat_super:
1761 up_write(&s->s_umount);
1762 deactivate_super(s);
29eb981a 1763 goto out;
f7b422b1
DH		 1764}
1765
1766static void nfs4_kill_super(struct super_block *sb)
1767{
1768 struct nfs_server *server = NFS_SB(sb);
1769
1770 nfs_return_all_delegations(sb);
1771 kill_anon_super(sb);
1772
1773 nfs4_renewd_prepare_shutdown(server);
54ceac45 1774 nfs_free_server(server);
f7b422b1
DH		 1775}
1776
1777/*
54ceac45 1778 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 1779 */
54ceac45
DH		 1780static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1781 const char *dev_name, void *raw_data,
1782 struct vfsmount *mnt)
f7b422b1 1783{
54ceac45
DH		 1784 struct nfs_clone_mount *data = raw_data;
1785 struct super_block *s;
1786 struct nfs_server *server;
1787 struct dentry *mntroot;
75180df2 1788 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1789 struct nfs_sb_mountdata sb_mntdata = {
1790 .mntflags = flags,
1791 };
54ceac45 1792 int error;
f7b422b1 1793
54ceac45 1794 dprintk("--> nfs4_xdev_get_sb()\n");
f7b422b1 1795
54ceac45
DH		 1796 /* create a new volume representation */
1797 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1798 if (IS_ERR(server)) {
1799 error = PTR_ERR(server);
1800 goto out_err_noserver;
f7b422b1 1801 }
e89a5a43 1802 sb_mntdata.server = server;
f7b422b1 1803
75180df2
TM		 1804 if (server->flags & NFS4_MOUNT_UNSHARED)
1805 compare_super = NULL;
1806
54ceac45 1807 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 1808 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 1809 if (IS_ERR(s)) {
1810 error = PTR_ERR(s);
1811 goto out_err_nosb;
f7b422b1 1812 }
f7b422b1 1813
54ceac45
DH		 1814 if (s->s_fs_info != server) {
1815 nfs_free_server(server);
1816 server = NULL;
1817 }
f7b422b1 1818
54ceac45
DH		 1819 if (!s->s_root) {
1820 /* initial superblock/root creation */
54ceac45
DH		 1821 nfs4_clone_super(s, data->sb);
1822 }
f7b422b1 1823
54ceac45
DH		 1824 mntroot = nfs4_get_root(s, data->fh);
1825 if (IS_ERR(mntroot)) {
1826 error = PTR_ERR(mntroot);
1827 goto error_splat_super;
1828 }
e9cc6c23
TM		 1829 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1830 dput(mntroot);
1831 error = -ESTALE;
1832 goto error_splat_super;
1833 }
f7b422b1 1834
54ceac45
DH		 1835 s->s_flags |= MS_ACTIVE;
1836 mnt->mnt_sb = s;
1837 mnt->mnt_root = mntroot;
1838
1839 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1840 return 0;
1841
1842out_err_nosb:
1843 nfs_free_server(server);
1844out_err_noserver:
1845 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
1846 return error;
1847
1848error_splat_super:
1849 up_write(&s->s_umount);
1850 deactivate_super(s);
1851 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
1852 return error;
f7b422b1
DH		 1853}
1854
54ceac45
DH		 1855/*
1856 * Create an NFS4 server record on referral traversal
1857 */
1858static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
1859 const char *dev_name, void *raw_data,
1860 struct vfsmount *mnt)
f7b422b1
DH		 1861{
1862 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 1863 struct super_block *s;
1864 struct nfs_server *server;
1865 struct dentry *mntroot;
1866 struct nfs_fh mntfh;
75180df2 1867 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 1868 struct nfs_sb_mountdata sb_mntdata = {
1869 .mntflags = flags,
1870 };
54ceac45
DH		 1871 int error;
1872
1873 dprintk("--> nfs4_referral_get_sb()\n");
1874
1875 /* create a new volume representation */
1876 server = nfs4_create_referral_server(data, &mntfh);
1877 if (IS_ERR(server)) {
1878 error = PTR_ERR(server);
1879 goto out_err_noserver;
1880 }
e89a5a43 1881 sb_mntdata.server = server;
54ceac45 1882
75180df2
TM		 1883 if (server->flags & NFS4_MOUNT_UNSHARED)
1884 compare_super = NULL;
1885
54ceac45 1886 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 1887 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 1888 if (IS_ERR(s)) {
1889 error = PTR_ERR(s);
1890 goto out_err_nosb;
1891 }
1892
1893 if (s->s_fs_info != server) {
1894 nfs_free_server(server);
1895 server = NULL;
1896 }
1897
1898 if (!s->s_root) {
1899 /* initial superblock/root creation */
54ceac45
DH		 1900 nfs4_fill_super(s);
1901 }
1902
f2d0d85e 1903 mntroot = nfs4_get_root(s, &mntfh);
54ceac45
DH		 1904 if (IS_ERR(mntroot)) {
1905 error = PTR_ERR(mntroot);
1906 goto error_splat_super;
1907 }
e9cc6c23
TM		 1908 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1909 dput(mntroot);
1910 error = -ESTALE;
1911 goto error_splat_super;
1912 }
54ceac45
DH		 1913
1914 s->s_flags |= MS_ACTIVE;
1915 mnt->mnt_sb = s;
1916 mnt->mnt_root = mntroot;
1917
1918 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1919 return 0;
1920
1921out_err_nosb:
1922 nfs_free_server(server);
1923out_err_noserver:
1924 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
1925 return error;
1926
1927error_splat_super:
1928 up_write(&s->s_umount);
1929 deactivate_super(s);
1930 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
1931 return error;
f7b422b1
DH		 1932}
1933
54ceac45 1934#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)