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Merge tag 'hyperv-next-signed-20201214' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / fs / nfs / super.c
CommitLineData
457c8996 1// SPDX-License-Identifier: GPL-2.0-only
f7b422b1
DH		 2/*
3 * linux/fs/nfs/super.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs superblock handling functions
8 *
526719ba 9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 * Split from inode.c by David Howells <dhowells@redhat.com>
16 *
54ceac45
DH		 17 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
18 * particular server are held in the same superblock
19 * - NFS superblocks can have several effective roots to the dentry tree
20 * - directory type roots are spliced into the tree when a path from one root reaches the root
21 * of another (see nfs_lookup())
f7b422b1
DH		 22 */
23
f7b422b1
DH		 24#include <linux/module.h>
25#include <linux/init.h>
26
27#include <linux/time.h>
28#include <linux/kernel.h>
29#include <linux/mm.h>
30#include <linux/string.h>
31#include <linux/stat.h>
32#include <linux/errno.h>
33#include <linux/unistd.h>
34#include <linux/sunrpc/clnt.h>
5976687a 35#include <linux/sunrpc/addr.h>
f7b422b1
DH		 36#include <linux/sunrpc/stats.h>
37#include <linux/sunrpc/metrics.h>
0896a725 38#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 39#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 40#include <linux/nfs_fs.h>
41#include <linux/nfs_mount.h>
42#include <linux/nfs4_mount.h>
43#include <linux/lockd/bind.h>
f7b422b1
DH		 44#include <linux/seq_file.h>
45#include <linux/mount.h>
c02d7adf 46#include <linux/namei.h>
f7b422b1
DH		 47#include <linux/vfs.h>
48#include <linux/inet.h>
fd00a8ff 49#include <linux/in6.h>
5a0e3ad6 50#include <linux/slab.h>
fd00a8ff 51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.h>
e50a7a1a 56#include <linux/nsproxy.h>
2446ab60 57#include <linux/rcupdate.h>
f7b422b1 58
7c0f6ba6 59#include <linux/uaccess.h>
0cfcd405 60#include <linux/nfs_ssc.h>
f7b422b1
DH		 61
62#include "nfs4_fs.h"
63#include "callback.h"
64#include "delegation.h"
65#include "iostat.h"
66#include "internal.h"
08734048 67#include "fscache.h"
76e697ba 68#include "nfs4session.h"
ae50c0b5 69#include "pnfs.h"
ab7017a3 70#include "nfs.h"
f7b422b1
DH		 71
72#define NFSDBG_FACILITY NFSDBG_VFS
bf0fd768 73
6a74490d 74const struct super_operations nfs_sops = {
f7b422b1 75 .alloc_inode = nfs_alloc_inode,
ca1a199e 76 .free_inode = nfs_free_inode,
f7b422b1 77 .write_inode = nfs_write_inode,
eed99357 78 .drop_inode = nfs_drop_inode,
f7b422b1 79 .statfs = nfs_statfs,
b57922d9 80 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 81 .umount_begin = nfs_umount_begin,
82 .show_options = nfs_show_options,
c7f404b4
AV		 83 .show_devname = nfs_show_devname,
84 .show_path = nfs_show_path,
f7b422b1
DH		 85 .show_stats = nfs_show_stats,
86};
ddda8e0a 87EXPORT_SYMBOL_GPL(nfs_sops);
f7b422b1 88
0cfcd405
DN		 89static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = {
90 .sco_sb_deactive = nfs_sb_deactive,
91};
92
89d77c8f 93#if IS_ENABLED(CONFIG_NFS_V4)
1ae811ee 94static int __init register_nfs4_fs(void)
95{
96 return register_filesystem(&nfs4_fs_type);
97}
98
99static void unregister_nfs4_fs(void)
100{
101 unregister_filesystem(&nfs4_fs_type);
102}
103#else
104static int __init register_nfs4_fs(void)
105{
106 return 0;
107}
108
109static void unregister_nfs4_fs(void)
110{
111}
f7b422b1
DH		 112#endif
113
0cfcd405
DN		 114static void nfs_ssc_register_ops(void)
115{
116 nfs_ssc_register(&nfs_ssc_clnt_ops_tbl);
117}
118
119static void nfs_ssc_unregister_ops(void)
120{
121 nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl);
122}
123
8e1f936b 124static struct shrinker acl_shrinker = {
1ab6c499
DC		 125 .count_objects = nfs_access_cache_count,
126 .scan_objects = nfs_access_cache_scan,
8e1f936b
RR		 127 .seeks = DEFAULT_SEEKS,
128};
979df72e 129
f7b422b1
DH		 130/*
131 * Register the NFS filesystems
132 */
133int __init register_nfs_fs(void)
134{
135 int ret;
136
137 ret = register_filesystem(&nfs_fs_type);
138 if (ret < 0)
139 goto error_0;
140
1ae811ee 141 ret = register_nfs4_fs();
f7b422b1
DH		 142 if (ret < 0)
143 goto error_1;
1ae811ee 144
145 ret = nfs_register_sysctl();
146 if (ret < 0)
147 goto error_2;
5ef8d792
KM		 148 ret = register_shrinker(&acl_shrinker);
149 if (ret < 0)
150 goto error_3;
0cfcd405 151 nfs_ssc_register_ops();
f7b422b1 152 return 0;
5ef8d792
KM		 153error_3:
154 nfs_unregister_sysctl();
1ae811ee 155error_2:
156 unregister_nfs4_fs();
f7b422b1
DH		 157error_1:
158 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 159error_0:
160 return ret;
161}
162
163/*
164 * Unregister the NFS filesystems
165 */
166void __exit unregister_nfs_fs(void)
167{
8e1f936b 168 unregister_shrinker(&acl_shrinker);
49af7ee1 169 nfs_unregister_sysctl();
1ae811ee 170 unregister_nfs4_fs();
0cfcd405 171 nfs_ssc_unregister_ops();
f7b422b1
DH		 172 unregister_filesystem(&nfs_fs_type);
173}
174
ea7c38fe 175bool nfs_sb_active(struct super_block *sb)
ef818a28 176{
1daef0a8 177 struct nfs_server *server = NFS_SB(sb);
ef818a28 178
ea7c38fe
TM		 179 if (!atomic_inc_not_zero(&sb->s_active))
180 return false;
181 if (atomic_inc_return(&server->active) != 1)
182 atomic_dec(&sb->s_active);
183 return true;
ef818a28 184}
89d77c8f 185EXPORT_SYMBOL_GPL(nfs_sb_active);
ef818a28 186
1daef0a8 187void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 188{
189 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 190
191 if (atomic_dec_and_test(&server->active))
192 deactivate_super(sb);
ef818a28 193}
89d77c8f 194EXPORT_SYMBOL_GPL(nfs_sb_deactive);
ef818a28 195
3c9e502b
TM		 196static int __nfs_list_for_each_server(struct list_head *head,
197 int (*fn)(struct nfs_server *, void *),
198 void *data)
199{
200 struct nfs_server *server, *last = NULL;
201 int ret = 0;
202
203 rcu_read_lock();
204 list_for_each_entry_rcu(server, head, client_link) {
9c07b75b 205 if (!(server->super && nfs_sb_active(server->super)))
3c9e502b
TM		 206 continue;
207 rcu_read_unlock();
208 if (last)
209 nfs_sb_deactive(last->super);
210 last = server;
211 ret = fn(server, data);
212 if (ret)
213 goto out;
214 rcu_read_lock();
215 }
216 rcu_read_unlock();
217out:
218 if (last)
219 nfs_sb_deactive(last->super);
220 return ret;
221}
222
223int nfs_client_for_each_server(struct nfs_client *clp,
224 int (*fn)(struct nfs_server *, void *),
225 void *data)
226{
227 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data);
228}
229EXPORT_SYMBOL_GPL(nfs_client_for_each_server);
230
f7b422b1
DH		 231/*
232 * Deliver file system statistics to userspace
233 */
fbdefd64 234int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 235{
0c7d90cf 236 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 237 unsigned char blockbits;
238 unsigned long blockres;
2b0143b5 239 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
ca7e9a0d
TM		 240 struct nfs_fsstat res;
241 int error = -ENOMEM;
242
243 res.fattr = nfs_alloc_fattr();
244 if (res.fattr == NULL)
245 goto out_err;
f7b422b1 246
8fa5c000 247 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 248 if (unlikely(error == -ESTALE)) {
249 struct dentry *pd_dentry;
250
251 pd_dentry = dget_parent(dentry);
1cfb7072
AV		 252 nfs_zap_caches(d_inode(pd_dentry));
253 dput(pd_dentry);
fbf3fdd2 254 }
ca7e9a0d 255 nfs_free_fattr(res.fattr);
f7b422b1
DH		 256 if (error < 0)
257 goto out_err;
ca7e9a0d 258
1a0ba9ae 259 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 260
261 /*
262 * Current versions of glibc do not correctly handle the
263 * case where f_frsize != f_bsize. Eventually we want to
264 * report the value of wtmult in this field.
265 */
0c7d90cf 266 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 267
268 /*
269 * On most *nix systems, f_blocks, f_bfree, and f_bavail
270 * are reported in units of f_frsize. Linux hasn't had
271 * an f_frsize field in its statfs struct until recently,
272 * thus historically Linux's sys_statfs reports these
273 * fields in units of f_bsize.
274 */
0c7d90cf
DH		 275 buf->f_bsize = dentry->d_sb->s_blocksize;
276 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 277 blockres = (1 << blockbits) - 1;
278 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
279 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
280 buf->f_bavail = (res.abytes + blockres) >> blockbits;
281
282 buf->f_files = res.tfiles;
283 buf->f_ffree = res.afiles;
284
285 buf->f_namelen = server->namelen;
1a0ba9ae 286
f7b422b1
DH		 287 return 0;
288
289 out_err:
3110ff80 290 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 291 return error;
f7b422b1 292}
89d77c8f 293EXPORT_SYMBOL_GPL(nfs_statfs);
f7b422b1 294
7d4e2747
DH		 295/*
296 * Map the security flavour number to a name
297 */
81039f1f
TM		 298static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
299{
7d4e2747 300 static const struct {
81039f1f
TM		 301 rpc_authflavor_t flavour;
302 const char *str;
4d4b69dd
WAA		 303 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
304 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
81039f1f
TM		 305 { RPC_AUTH_NULL, "null" },
306 { RPC_AUTH_UNIX, "sys" },
307 { RPC_AUTH_GSS_KRB5, "krb5" },
308 { RPC_AUTH_GSS_KRB5I, "krb5i" },
309 { RPC_AUTH_GSS_KRB5P, "krb5p" },
310 { RPC_AUTH_GSS_LKEY, "lkey" },
311 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
312 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
313 { RPC_AUTH_GSS_SPKM, "spkm" },
314 { RPC_AUTH_GSS_SPKMI, "spkmi" },
315 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 316 { UINT_MAX, "unknown" }
81039f1f
TM		 317 };
318 int i;
319
4d81cd16 320 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 321 if (sec_flavours[i].flavour == flavour)
322 break;
323 }
324 return sec_flavours[i].str;
325}
326
ee671b01
JL		 327static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
328 int showdefaults)
329{
330 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
6f6e3c09 331 char *proto = NULL;
ee671b01 332
ee671b01
JL		 333 switch (sap->sa_family) {
334 case AF_INET:
335 switch (nfss->mountd_protocol) {
336 case IPPROTO_UDP:
6f6e3c09 337 proto = RPCBIND_NETID_UDP;
ee671b01
JL		 338 break;
339 case IPPROTO_TCP:
6f6e3c09 340 proto = RPCBIND_NETID_TCP;
ee671b01 341 break;
ee671b01
JL		 342 }
343 break;
344 case AF_INET6:
345 switch (nfss->mountd_protocol) {
346 case IPPROTO_UDP:
6f6e3c09 347 proto = RPCBIND_NETID_UDP6;
ee671b01
JL		 348 break;
349 case IPPROTO_TCP:
6f6e3c09 350 proto = RPCBIND_NETID_TCP6;
ee671b01 351 break;
ee671b01
JL		 352 }
353 break;
ee671b01 354 }
6f6e3c09
N		 355 if (proto || showdefaults)
356 seq_printf(m, ",mountproto=%s", proto ?: "auto");
ee671b01
JL		 357}
358
82d101d5
CL		 359static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
360 int showdefaults)
361{
362 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
363
d5eff1a3
BS		 364 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
365 return;
366
82d101d5
CL		 367 switch (sap->sa_family) {
368 case AF_INET: {
369 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 370 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 371 break;
372 }
373 case AF_INET6: {
374 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 375 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 376 break;
377 }
378 default:
379 if (showdefaults)
1c316e39 380 seq_puts(m, ",mountaddr=unspecified");
82d101d5
CL		 381 }
382
383 if (nfss->mountd_version || showdefaults)
384 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 385 if ((nfss->mountd_port &&
386 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
387 showdefaults)
82d101d5
CL		 388 seq_printf(m, ",mountport=%u", nfss->mountd_port);
389
ee671b01 390 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 391}
392
89d77c8f 393#if IS_ENABLED(CONFIG_NFS_V4)
0be8189f
TM		 394static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
395 int showdefaults)
396{
397 struct nfs_client *clp = nfss->nfs_client;
398
399 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 400}
401#else
402static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
403 int showdefaults)
404{
405}
406#endif
407
7bbceb6f
TM		 408static void nfs_show_nfs_version(struct seq_file *m,
409 unsigned int version,
410 unsigned int minorversion)
411{
412 seq_printf(m, ",vers=%u", version);
413 if (version == 4)
414 seq_printf(m, ".%u", minorversion);
415}
416
f7b422b1
DH		 417/*
418 * Describe the mount options in force on this server representation
419 */
82d101d5
CL		 420static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
421 int showdefaults)
f7b422b1 422{
509de811 423 static const struct proc_nfs_info {
f7b422b1 424 int flag;
509de811
DH		 425 const char *str;
426 const char *nostr;
f7b422b1 427 } nfs_info[] = {
91a575e1
TM		 428 { NFS_MOUNT_SOFT, ",soft", "" },
429 { NFS_MOUNT_SOFTERR, ",softerr", "" },
c74dfe97 430 { NFS_MOUNT_SOFTREVAL, ",softreval", "" },
82d101d5 431 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 432 { NFS_MOUNT_NOCTO, ",nocto", "" },
433 { NFS_MOUNT_NOAC, ",noac", "" },
434 { NFS_MOUNT_NONLM, ",nolock", "" },
435 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 436 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 437 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
438 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 439 { 0, NULL, NULL }
440 };
509de811 441 const struct proc_nfs_info *nfs_infop;
8fa5c000 442 struct nfs_client *clp = nfss->nfs_client;
82d101d5 443 u32 version = clp->rpc_ops->version;
7c563cc9 444 int local_flock, local_fcntl;
f7b422b1 445
7bbceb6f 446 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 447 seq_printf(m, ",rsize=%u", nfss->rsize);
448 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 449 if (nfss->bsize != 0)
450 seq_printf(m, ",bsize=%u", nfss->bsize);
451 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 452 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 453 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 454 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 455 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 456 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 457 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 458 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 459 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
91a575e1
TM		 460 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
461 seq_puts(m, ",hard");
f7b422b1
DH		 462 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
463 if (nfss->flags & nfs_infop->flag)
464 seq_puts(m, nfs_infop->str);
465 else
466 seq_puts(m, nfs_infop->nostr);
467 }
2446ab60 468 rcu_read_lock();
56928edd 469 seq_printf(m, ",proto=%s",
ee671b01 470 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 471 rcu_read_unlock();
fd87c8b7
TM		 472 if (clp->cl_nconnect > 0)
473 seq_printf(m, ",nconnect=%u", clp->cl_nconnect);
82d101d5
CL		 474 if (version == 4) {
475 if (nfss->port != NFS_PORT)
476 seq_printf(m, ",port=%u", nfss->port);
477 } else
478 if (nfss->port)
479 seq_printf(m, ",port=%u", nfss->port);
480
33170233
TM		 481 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
482 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 483 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 484
485 if (version != 4)
486 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 487 else
488 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 489
b797cac7 490 if (nfss->options & NFS_OPTION_FSCACHE)
1c316e39 491 seq_puts(m, ",fsc");
9b00c643 492
89652617 493 if (nfss->options & NFS_OPTION_MIGRATION)
1c316e39 494 seq_puts(m, ",migration");
89652617 495
9b00c643
PL		 496 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
497 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
1c316e39 498 seq_puts(m, ",lookupcache=none");
9b00c643 499 else
1c316e39 500 seq_puts(m, ",lookupcache=pos");
9b00c643 501 }
7c563cc9
SJ		 502
503 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
504 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
505
506 if (!local_flock && !local_fcntl)
1c316e39 507 seq_puts(m, ",local_lock=none");
7c563cc9 508 else if (local_flock && local_fcntl)
1c316e39 509 seq_puts(m, ",local_lock=all");
7c563cc9 510 else if (local_flock)
1c316e39 511 seq_puts(m, ",local_lock=flock");
7c563cc9 512 else
1c316e39 513 seq_puts(m, ",local_lock=posix");
f7b422b1
DH		 514}
515
516/*
517 * Describe the mount options on this VFS mountpoint
518 */
fbdefd64 519int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 520{
34c80b1d 521 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 522
523 nfs_show_mount_options(m, nfss, 0);
524
2446ab60 525 rcu_read_lock();
5d8515ca
CL		 526 seq_printf(m, ",addr=%s",
527 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
528 RPC_DISPLAY_ADDR));
2446ab60 529 rcu_read_unlock();
f7b422b1
DH		 530
531 return 0;
532}
89d77c8f 533EXPORT_SYMBOL_GPL(nfs_show_options);
45402c38 534
89d77c8f 535#if IS_ENABLED(CONFIG_NFS_V4)
1a7441b2
DW		 536static void show_lease(struct seq_file *m, struct nfs_server *server)
537{
538 struct nfs_client *clp = server->nfs_client;
539 unsigned long expire;
540
541 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ);
542 expire = clp->cl_last_renewal + clp->cl_lease_time;
543 seq_printf(m, ",lease_expired=%ld",
544 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ);
545}
ae50c0b5 546#ifdef CONFIG_NFS_V4_1
45402c38 547static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 548{
549 if (nfs4_has_session(server->nfs_client))
1c316e39 550 seq_puts(m, ",sessions");
ae50c0b5
BF		 551}
552#else
45402c38
HS		 553static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
554#endif
ae50c0b5
BF		 555#endif
556
557#ifdef CONFIG_NFS_V4_1
45402c38 558static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 559{
560 seq_printf(m, ",pnfs=");
561 if (server->pnfs_curr_ld)
562 seq_printf(m, "%s", server->pnfs_curr_ld->name);
563 else
564 seq_printf(m, "not configured");
565}
7e03b7cc
TM		 566
567static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
568{
59155546
CL		 569 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
570 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 571 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
572 "date='%llu,%u'",
573 impl_id->name, impl_id->domain,
574 impl_id->date.seconds, impl_id->date.nseconds);
575 }
576}
45402c38 577#else
89d77c8f 578#if IS_ENABLED(CONFIG_NFS_V4)
7e03b7cc
TM		 579static void show_pnfs(struct seq_file *m, struct nfs_server *server)
580{
581}
45402c38 582#endif
7e03b7cc
TM		 583static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
584{
585}
45402c38 586#endif
f7b422b1 587
fbdefd64 588int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 589{
590 char *page = (char *) __get_free_page(GFP_KERNEL);
591 char *devname, *dummy;
592 int err = 0;
593 if (!page)
594 return -ENOMEM;
97a54868 595 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
c7f404b4
AV		 596 if (IS_ERR(devname))
597 err = PTR_ERR(devname);
598 else
599 seq_escape(m, devname, " \t\n\\");
600 free_page((unsigned long)page);
601 return err;
602}
89d77c8f 603EXPORT_SYMBOL_GPL(nfs_show_devname);
c7f404b4 604
fbdefd64 605int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 606{
607 seq_puts(m, "/");
608 return 0;
609}
89d77c8f 610EXPORT_SYMBOL_GPL(nfs_show_path);
c7f404b4 611
f7b422b1
DH		 612/*
613 * Present statistical information for this VFS mountpoint
614 */
fbdefd64 615int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 616{
617 int i, cpu;
64132379 618 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 619 struct rpc_auth *auth = nfss->client->cl_auth;
620 struct nfs_iostats totals = { };
621
622 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
623
624 /*
625 * Display all mount option settings
626 */
1c316e39 627 seq_puts(m, "\n\topts:\t");
bc98a42c 628 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
1751e8a6
LT		 629 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
630 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
631 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 632 nfs_show_mount_options(m, nfss, 1);
633
634 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
635
7e03b7cc 636 show_implementation_id(m, nfss);
7d2ed9ac 637
1c316e39 638 seq_puts(m, "\n\tcaps:\t");
f7b422b1 639 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 640 seq_printf(m, ",wtmult=%u", nfss->wtmult);
641 seq_printf(m, ",dtsize=%u", nfss->dtsize);
642 seq_printf(m, ",bsize=%u", nfss->bsize);
643 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1 644
89d77c8f 645#if IS_ENABLED(CONFIG_NFS_V4)
40c55319 646 if (nfss->nfs_client->rpc_ops->version == 4) {
1c316e39 647 seq_puts(m, "\n\tnfsv4:\t");
f7b422b1
DH		 648 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
649 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
a09df2ca 650 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
f7b422b1 651 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 652 show_sessions(m, nfss);
653 show_pnfs(m, nfss);
1a7441b2 654 show_lease(m, nfss);
f7b422b1
DH		 655 }
656#endif
657
658 /*
659 * Display security flavor in effect for this mount
660 */
2d767432 661 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 662 if (auth->au_flavor)
2d767432 663 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 664
665 /*
666 * Display superblock I/O counters
667 */
668 for_each_possible_cpu(cpu) {
669 struct nfs_iostats *stats;
670
671 preempt_disable();
672 stats = per_cpu_ptr(nfss->io_stats, cpu);
673
674 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
675 totals.events[i] += stats->events[i];
676 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
677 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 678#ifdef CONFIG_NFS_FSCACHE
679 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
680 totals.fscache[i] += stats->fscache[i];
681#endif
f7b422b1
DH		 682
683 preempt_enable();
684 }
685
1c316e39 686 seq_puts(m, "\n\tevents:\t");
f7b422b1
DH		 687 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
688 seq_printf(m, "%lu ", totals.events[i]);
1c316e39 689 seq_puts(m, "\n\tbytes:\t");
f7b422b1
DH		 690 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
691 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 692#ifdef CONFIG_NFS_FSCACHE
693 if (nfss->options & NFS_OPTION_FSCACHE) {
1c316e39 694 seq_puts(m, "\n\tfsc:\t");
6a51091d 695 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
ce85bd29 696 seq_printf(m, "%Lu ", totals.fscache[i]);
6a51091d
DH		 697 }
698#endif
9bcaa35c 699 seq_putc(m, '\n');
f7b422b1 700
016583d7 701 rpc_clnt_show_stats(m, nfss->client);
f7b422b1
DH		 702
703 return 0;
704}
89d77c8f 705EXPORT_SYMBOL_GPL(nfs_show_stats);
f7b422b1
DH		 706
707/*
708 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 709 * in response to xdev traversals and referrals
f7b422b1 710 */
fbdefd64 711void nfs_umount_begin(struct super_block *sb)
f7b422b1 712{
67e55205 713 struct nfs_server *server;
fc6ae3cf
TM		 714 struct rpc_clnt *rpc;
715
67e55205 716 server = NFS_SB(sb);
fc6ae3cf
TM		 717 /* -EIO all pending I/O */
718 rpc = server->client_acl;
719 if (!IS_ERR(rpc))
720 rpc_killall_tasks(rpc);
721 rpc = server->client;
722 if (!IS_ERR(rpc))
723 rpc_killall_tasks(rpc);
f7b422b1 724}
89d77c8f 725EXPORT_SYMBOL_GPL(nfs_umount_begin);
f7b422b1 726
4d4b69dd
WAA		 727/*
728 * Return true if 'match' is in auth_info or auth_info is empty.
729 * Return false otherwise.
730 */
731bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
732 rpc_authflavor_t match)
733{
734 int i;
735
736 if (!auth_info->flavor_len)
737 return true;
738
739 for (i = 0; i < auth_info->flavor_len; i++) {
740 if (auth_info->flavors[i] == match)
741 return true;
742 }
743 return false;
744}
745EXPORT_SYMBOL_GPL(nfs_auth_info_match);
746
ec88f28d 747/*
38465f5d
SM		 748 * Ensure that a specified authtype in ctx->auth_info is supported by
749 * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and
4d4b69dd 750 * -EACCES if not.
ec88f28d 751 */
38465f5d 752static int nfs_verify_authflavors(struct nfs_fs_context *ctx,
5eb005ca
DH		 753 rpc_authflavor_t *server_authlist,
754 unsigned int count)
ec88f28d 755{
4d4b69dd 756 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
53a75f22 757 bool found_auth_null = false;
9111c95b 758 unsigned int i;
4580a92d 759
d497ab97
WAA		 760 /*
761 * If the sec= mount option is used, the specified flavor or AUTH_NULL
762 * must be in the list returned by the server.
763 *
764 * AUTH_NULL has a special meaning when it's in the server list - it
765 * means that the server will ignore the rpc creds, so any flavor
e68fd7c8 766 * can be used but still use the sec= that was specified.
53a75f22
CL		 767 *
768 * Note also that the MNT procedure in MNTv1 does not return a list
769 * of supported security flavors. In this case, nfs_mount() fabricates
770 * a security flavor list containing just AUTH_NULL.
d497ab97 771 */
4580a92d 772 for (i = 0; i < count; i++) {
4d4b69dd
WAA		 773 flavor = server_authlist[i];
774
38465f5d 775 if (nfs_auth_info_match(&ctx->auth_info, flavor))
9111c95b 776 goto out;
e68fd7c8
SD		 777
778 if (flavor == RPC_AUTH_NULL)
53a75f22 779 found_auth_null = true;
e68fd7c8
SD		 780 }
781
53a75f22 782 if (found_auth_null) {
38465f5d 783 flavor = ctx->auth_info.flavors[0];
e68fd7c8 784 goto out;
4580a92d 785 }
ec88f28d 786
4d4b69dd
WAA		 787 dfprintk(MOUNT,
788 "NFS: specified auth flavors not supported by server\n");
9111c95b 789 return -EACCES;
d497ab97 790
4580a92d 791out:
38465f5d
SM		 792 ctx->selected_flavor = flavor;
793 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor);
d497ab97 794 return 0;
ec88f28d
CL		 795}
796
0076d7b7
CL		 797/*
798 * Use the remote server's MOUNT service to request the NFS file handle
799 * corresponding to the provided path.
800 */
62a55d08 801static int nfs_request_mount(struct fs_context *fc,
294ae81d
JL		 802 struct nfs_fh *root_fh,
803 rpc_authflavor_t *server_authlist,
804 unsigned int *server_authlist_len)
0076d7b7 805{
62a55d08 806 struct nfs_fs_context *ctx = nfs_fc2context(fc);
c5d120f8
CL		 807 struct nfs_mount_request request = {
808 .sap = (struct sockaddr *)
38465f5d
SM		 809 &ctx->mount_server.address,
810 .dirpath = ctx->nfs_server.export_path,
811 .protocol = ctx->mount_server.protocol,
c5d120f8 812 .fh = root_fh,
38465f5d 813 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT,
294ae81d 814 .auth_flav_len = server_authlist_len,
ec88f28d 815 .auth_flavs = server_authlist,
62a55d08 816 .net = fc->net_ns,
c5d120f8 817 };
4c568017 818 int status;
0076d7b7 819
38465f5d
SM		 820 if (ctx->mount_server.version == 0) {
821 switch (ctx->version) {
8a6e5deb 822 default:
38465f5d 823 ctx->mount_server.version = NFS_MNT3_VERSION;
8a6e5deb
TM		 824 break;
825 case 2:
38465f5d 826 ctx->mount_server.version = NFS_MNT_VERSION;
8a6e5deb 827 }
0076d7b7 828 }
38465f5d 829 request.version = ctx->mount_server.version;
0076d7b7 830
38465f5d
SM		 831 if (ctx->mount_server.hostname)
832 request.hostname = ctx->mount_server.hostname;
33832034 833 else
38465f5d 834 request.hostname = ctx->nfs_server.hostname;
33832034 835
0076d7b7
CL		 836 /*
837 * Construct the mount server's address.
838 */
38465f5d
SM		 839 if (ctx->mount_server.address.sa_family == AF_UNSPEC) {
840 memcpy(request.sap, &ctx->nfs_server.address,
841 ctx->nfs_server.addrlen);
842 ctx->mount_server.addrlen = ctx->nfs_server.addrlen;
4c568017 843 }
38465f5d
SM		 844 request.salen = ctx->mount_server.addrlen;
845 nfs_set_port(request.sap, &ctx->mount_server.port, 0);
0076d7b7
CL		 846
847 /*
848 * Now ask the mount server to map our export path
849 * to a file handle.
850 */
c5d120f8 851 status = nfs_mount(&request);
ec88f28d
CL		 852 if (status != 0) {
853 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
854 request.hostname, status);
855 return status;
856 }
0076d7b7 857
9111c95b 858 return 0;
0076d7b7
CL		 859}
860
62a55d08 861static struct nfs_server *nfs_try_mount_request(struct fs_context *fc)
d17540c6 862{
62a55d08 863 struct nfs_fs_context *ctx = nfs_fc2context(fc);
d17540c6 864 int status;
9111c95b
JL		 865 unsigned int i;
866 bool tried_auth_unix = false;
867 bool auth_null_in_list = false;
868 struct nfs_server *server = ERR_PTR(-EACCES);
294ae81d
JL		 869 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
870 unsigned int authlist_len = ARRAY_SIZE(authlist);
d17540c6 871
62a55d08 872 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len);
d17540c6
JL		 873 if (status)
874 return ERR_PTR(status);
875
9111c95b
JL		 876 /*
877 * Was a sec= authflavor specified in the options? First, verify
878 * whether the server supports it, and then just try to use it if so.
879 */
5eb005ca
DH		 880 if (ctx->auth_info.flavor_len > 0) {
881 status = nfs_verify_authflavors(ctx, authlist, authlist_len);
a3f73c27 882 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
5eb005ca 883 ctx->selected_flavor);
9111c95b
JL		 884 if (status)
885 return ERR_PTR(status);
62a55d08 886 return ctx->nfs_mod->rpc_ops->create_server(fc);
9111c95b
JL		 887 }
888
889 /*
890 * No sec= option was provided. RFC 2623, section 2.7 suggests we
891 * SHOULD prefer the flavor listed first. However, some servers list
892 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
893 */
894 for (i = 0; i < authlist_len; ++i) {
895 rpc_authflavor_t flavor;
896 struct rpcsec_gss_info info;
897
898 flavor = authlist[i];
899 switch (flavor) {
900 case RPC_AUTH_UNIX:
901 tried_auth_unix = true;
902 break;
903 case RPC_AUTH_NULL:
904 auth_null_in_list = true;
905 continue;
906 default:
907 if (rpcauth_get_gssinfo(flavor, &info) != 0)
908 continue;
fb08334b 909 break;
9111c95b
JL		 910 }
911 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
5eb005ca 912 ctx->selected_flavor = flavor;
62a55d08 913 server = ctx->nfs_mod->rpc_ops->create_server(fc);
9111c95b
JL		 914 if (!IS_ERR(server))
915 return server;
916 }
917
918 /*
919 * Nothing we tried so far worked. At this point, give up if we've
920 * already tried AUTH_UNIX or if the server's list doesn't contain
921 * AUTH_NULL
922 */
923 if (tried_auth_unix || !auth_null_in_list)
924 return server;
925
926 /* Last chance! Try AUTH_UNIX */
927 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
5eb005ca 928 ctx->selected_flavor = RPC_AUTH_UNIX;
62a55d08 929 return ctx->nfs_mod->rpc_ops->create_server(fc);
d17540c6
JL		 930}
931
f2aedb71 932int nfs_try_get_tree(struct fs_context *fc)
486aa699 933{
f2aedb71
DH		 934 struct nfs_fs_context *ctx = nfs_fc2context(fc);
935
936 if (ctx->need_mount)
62a55d08 937 ctx->server = nfs_try_mount_request(fc);
d17540c6 938 else
62a55d08 939 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc);
486aa699 940
f2aedb71 941 return nfs_get_tree_common(fc);
486aa699 942}
f2aedb71
DH		 943EXPORT_SYMBOL_GPL(nfs_try_get_tree);
944
486aa699 945
71a6ec8a 946#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
c8e47028
SM		 947 | NFS_MOUNT_SECURE \
948 | NFS_MOUNT_TCP \
949 | NFS_MOUNT_VER3 \
950 | NFS_MOUNT_KERBEROS \
951 | NFS_MOUNT_NONLM \
952 | NFS_MOUNT_BROKEN_SUID \
953 | NFS_MOUNT_STRICTLOCK \
c8e47028
SM		 954 | NFS_MOUNT_LEGACY_INTERFACE)
955
71a6ec8a
SM		 956#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
957 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
958
48b605f8
JL		 959static int
960nfs_compare_remount_data(struct nfs_server *nfss,
5eb005ca 961 struct nfs_fs_context *ctx)
48b605f8 962{
5eb005ca
DH		 963 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
964 ctx->rsize != nfss->rsize ||
965 ctx->wsize != nfss->wsize ||
966 ctx->version != nfss->nfs_client->rpc_ops->version ||
967 ctx->minorversion != nfss->nfs_client->cl_minorversion ||
968 ctx->retrans != nfss->client->cl_timeout->to_retries ||
969 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) ||
970 ctx->acregmin != nfss->acregmin / HZ ||
971 ctx->acregmax != nfss->acregmax / HZ ||
972 ctx->acdirmin != nfss->acdirmin / HZ ||
973 ctx->acdirmax != nfss->acdirmax / HZ ||
974 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
975 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) ||
976 ctx->nfs_server.port != nfss->port ||
977 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
978 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address,
a1be9eee 979 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 980 return -EINVAL;
981
982 return 0;
983}
984
f2aedb71 985int nfs_reconfigure(struct fs_context *fc)
48b605f8 986{
f2aedb71
DH		 987 struct nfs_fs_context *ctx = nfs_fc2context(fc);
988 struct super_block *sb = fc->root->d_sb;
48b605f8 989 struct nfs_server *nfss = sb->s_fs_info;
48b605f8 990
02b9984d
TT		 991 sync_filesystem(sb);
992
48b605f8
JL		 993 /*
994 * Userspace mount programs that send binary options generally send
995 * them populated with default values. We have no way to know which
996 * ones were explicitly specified. Fall back to legacy behavior and
997 * just return success.
998 */
f2aedb71 999 if (ctx->skip_reconfig_option_check)
48b605f8
JL		 1000 return 0;
1001
26c4c170
JL		 1002 /*
1003 * noac is a special case. It implies -o sync, but that's not
f2aedb71 1004 * necessarily reflected in the mtab options. reconfigure_super
1751e8a6 1005 * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
26c4c170
JL		 1006 * remount options, so we have to explicitly reset it.
1007 */
f2aedb71
DH		 1008 if (ctx->flags & NFS_MOUNT_NOAC) {
1009 fc->sb_flags |= SB_SYNCHRONOUS;
1010 fc->sb_flags_mask |= SB_SYNCHRONOUS;
1011 }
26c4c170 1012
48b605f8 1013 /* compare new mount options with old ones */
f2aedb71 1014 return nfs_compare_remount_data(nfss, ctx);
48b605f8 1015}
f2aedb71 1016EXPORT_SYMBOL_GPL(nfs_reconfigure);
48b605f8 1017
f7b422b1 1018/*
ab88dca3 1019 * Finish setting up an NFS superblock
f7b422b1 1020 */
62a55d08 1021static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
f7b422b1
DH		 1022{
1023 struct nfs_server *server = NFS_SB(sb);
5006a76c 1024
54ceac45
DH		 1025 sb->s_blocksize_bits = 0;
1026 sb->s_blocksize = 0;
6a74490d
BS		 1027 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
1028 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
5eb005ca
DH		 1029 if (ctx && ctx->bsize)
1030 sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits);
f7b422b1 1031
6a74490d 1032 if (server->nfs_client->rpc_ops->version != 2) {
54ceac45
DH		 1033 /* The VFS shouldn't apply the umask to mode bits. We will do
1034 * so ourselves when necessary.
1035 */
1751e8a6 1036 sb->s_flags |= SB_POSIXACL;
54ceac45 1037 sb->s_time_gran = 1;
20fa1902 1038 sb->s_export_op = &nfs_export_ops;
1fcb79c1
DD		 1039 } else
1040 sb->s_time_gran = 1000;
1041
1042 if (server->nfs_client->rpc_ops->version != 4) {
1043 sb->s_time_min = 0;
1044 sb->s_time_max = U32_MAX;
1045 } else {
1046 sb->s_time_min = S64_MIN;
1047 sb->s_time_max = S64_MAX;
816724e6 1048 }
54ceac45 1049
ab88dca3 1050 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1051
ab88dca3
AV		 1052 /* We probably want something more informative here */
1053 snprintf(sb->s_id, sizeof(sb->s_id),
1054 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1fcb79c1 1055
ab88dca3
AV		 1056 if (sb->s_blocksize == 0)
1057 sb->s_blocksize = nfs_block_bits(server->wsize,
1058 &sb->s_blocksize_bits);
f7b422b1 1059
ab88dca3 1060 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 1061}
1062
62a55d08
SM		 1063static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b,
1064 const struct fs_context *fc)
275a5d24
TM		 1065{
1066 const struct nfs_server *a = s->s_fs_info;
1067 const struct rpc_clnt *clnt_a = a->client;
1068 const struct rpc_clnt *clnt_b = b->client;
1069
62a55d08 1070 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK))
275a5d24
TM		 1071 goto Ebusy;
1072 if (a->nfs_client != b->nfs_client)
1073 goto Ebusy;
0aea92bf 1074 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
275a5d24
TM		 1075 goto Ebusy;
1076 if (a->wsize != b->wsize)
1077 goto Ebusy;
1078 if (a->rsize != b->rsize)
1079 goto Ebusy;
1080 if (a->acregmin != b->acregmin)
1081 goto Ebusy;
1082 if (a->acregmax != b->acregmax)
1083 goto Ebusy;
1084 if (a->acdirmin != b->acdirmin)
1085 goto Ebusy;
1086 if (a->acdirmax != b->acdirmax)
1087 goto Ebusy;
594d1644 1088 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
275a5d24 1089 goto Ebusy;
e89a5a43 1090 return 1;
275a5d24 1091Ebusy:
e89a5a43
TM		 1092 return 0;
1093}
1094
f2aedb71 1095static int nfs_set_super(struct super_block *s, struct fs_context *fc)
e89a5a43 1096{
f2aedb71 1097 struct nfs_server *server = fc->s_fs_info;
e89a5a43
TM		 1098 int ret;
1099
8b244ff2 1100 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 1101 ret = set_anon_super(s, server);
1102 if (ret == 0)
1103 server->s_dev = s->s_dev;
1104 return ret;
1105}
1106
fd00a8ff
CL		 1107static int nfs_compare_super_address(struct nfs_server *server1,
1108 struct nfs_server *server2)
1109{
1110 struct sockaddr *sap1, *sap2;
7e3fcf61
BF		 1111 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
1112 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
1113
1114 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
1115 return 0;
fd00a8ff
CL		 1116
1117 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1118 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1119
1120 if (sap1->sa_family != sap2->sa_family)
1121 return 0;
1122
1123 switch (sap1->sa_family) {
1124 case AF_INET: {
1125 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1126 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1127 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1128 return 0;
1129 if (sin1->sin_port != sin2->sin_port)
1130 return 0;
1131 break;
1132 }
1133 case AF_INET6: {
1134 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1135 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1136 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1137 return 0;
1138 if (sin1->sin6_port != sin2->sin6_port)
1139 return 0;
1140 break;
1141 }
1142 default:
1143 return 0;
1144 }
1145
1146 return 1;
1147}
1148
3b7eb5e3
TM		 1149static int nfs_compare_userns(const struct nfs_server *old,
1150 const struct nfs_server *new)
1151{
1152 const struct user_namespace *oldns = &init_user_ns;
1153 const struct user_namespace *newns = &init_user_ns;
1154
1155 if (old->client && old->client->cl_cred)
1156 oldns = old->client->cl_cred->user_ns;
1157 if (new->client && new->client->cl_cred)
1158 newns = new->client->cl_cred->user_ns;
1159 if (oldns != newns)
1160 return 0;
1161 return 1;
1162}
1163
f2aedb71 1164static int nfs_compare_super(struct super_block *sb, struct fs_context *fc)
e89a5a43 1165{
f2aedb71 1166 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb);
e89a5a43 1167
fd00a8ff 1168 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 1169 return 0;
1170 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1171 if (old->flags & NFS_MOUNT_UNSHARED)
1172 return 0;
1173 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1174 return 0;
3b7eb5e3
TM		 1175 if (!nfs_compare_userns(old, server))
1176 return 0;
62a55d08 1177 return nfs_compare_mount_options(sb, server, fc);
275a5d24
TM		 1178}
1179
39ffb921 1180#ifdef CONFIG_NFS_FSCACHE
2311b943 1181static void nfs_get_cache_cookie(struct super_block *sb,
f2aedb71 1182 struct nfs_fs_context *ctx)
2311b943 1183{
c4271c6e 1184 struct nfs_server *nfss = NFS_SB(sb);
2311b943
BS		 1185 char *uniq = NULL;
1186 int ulen = 0;
1187
c4271c6e
TM		 1188 nfss->fscache_key = NULL;
1189 nfss->fscache = NULL;
1190
f2aedb71
DH		 1191 if (!ctx)
1192 return;
1193
1194 if (ctx->clone_data.sb) {
1195 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb);
c4271c6e
TM		 1196 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
1197 return;
2311b943
BS		 1198 if (mnt_s->fscache_key) {
1199 uniq = mnt_s->fscache_key->key.uniquifier;
1200 ulen = mnt_s->fscache_key->key.uniq_len;
9c91fa36 1201 }
f2aedb71
DH		 1202 } else {
1203 if (!(ctx->options & NFS_OPTION_FSCACHE))
1204 return;
1205 if (ctx->fscache_uniq) {
1206 uniq = ctx->fscache_uniq;
1207 ulen = strlen(ctx->fscache_uniq);
1208 }
f2aedb71 1209 }
2311b943
BS		 1210
1211 nfs_fscache_get_super_cookie(sb, uniq, ulen);
1212}
39ffb921
TM		 1213#else
1214static void nfs_get_cache_cookie(struct super_block *sb,
f2aedb71 1215 struct nfs_fs_context *ctx)
39ffb921
TM		 1216{
1217}
1218#endif
2311b943 1219
f2aedb71 1220int nfs_get_tree_common(struct fs_context *fc)
f7b422b1 1221{
f2aedb71 1222 struct nfs_fs_context *ctx = nfs_fc2context(fc);
f7b422b1 1223 struct super_block *s;
f2aedb71 1224 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super;
62a55d08 1225 struct nfs_server *server = ctx->server;
01194981 1226 int error;
33852a1f 1227
62a55d08 1228 ctx->server = NULL;
444a5296 1229 if (IS_ERR(server))
f2aedb71 1230 return PTR_ERR(server);
444a5296 1231
75180df2
TM		 1232 if (server->flags & NFS_MOUNT_UNSHARED)
1233 compare_super = NULL;
1234
fb2088cc
SP		 1235 /* -o noac implies -o sync */
1236 if (server->flags & NFS_MOUNT_NOAC)
f2aedb71
DH		 1237 fc->sb_flags |= SB_SYNCHRONOUS;
1238
1239 if (ctx->clone_data.sb)
1240 if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS)
1241 fc->sb_flags |= SB_SYNCHRONOUS;
fb2088cc 1242
f2aedb71
DH		 1243 if (server->caps & NFS_CAP_SECURITY_LABEL)
1244 fc->lsm_flags |= SECURITY_LSM_NATIVE_LABELS;
e890db01 1245
54ceac45 1246 /* Get a superblock - note that we may end up sharing one that already exists */
f2aedb71
DH		 1247 fc->s_fs_info = server;
1248 s = sget_fc(fc, compare_super, nfs_set_super);
1249 fc->s_fs_info = NULL;
816724e6 1250 if (IS_ERR(s)) {
f2aedb71 1251 error = PTR_ERR(s);
ce8866f0 1252 nfs_errorf(fc, "NFS: Couldn't get superblock");
54ceac45 1253 goto out_err_nosb;
816724e6
TM		 1254 }
1255
54ceac45
DH		 1256 if (s->s_fs_info != server) {
1257 nfs_free_server(server);
1258 server = NULL;
fa799759 1259 } else {
9052c7cf
JK		 1260 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
1261 MINOR(server->s_dev));
f2aedb71 1262 if (error)
9052c7cf 1263 goto error_splat_super;
55b2598e 1264 s->s_bdi->io_pages = server->rpages;
ce6cda18 1265 server->super = s;
54ceac45 1266 }
f7b422b1 1267
54ceac45 1268 if (!s->s_root) {
62a55d08 1269 unsigned bsize = ctx->clone_data.inherited_bsize;
54ceac45 1270 /* initial superblock/root creation */
62a55d08 1271 nfs_fill_super(s, ctx);
ab88dca3
AV		 1272 if (bsize) {
1273 s->s_blocksize_bits = bsize;
1274 s->s_blocksize = 1U << bsize;
1275 }
f2aedb71 1276 nfs_get_cache_cookie(s, ctx);
54ceac45 1277 }
f7b422b1 1278
62a55d08
SM		 1279 error = nfs_get_root(s, fc);
1280 if (error < 0) {
ce8866f0 1281 nfs_errorf(fc, "NFS: Couldn't get root dentry");
54ceac45 1282 goto error_splat_super;
f2aedb71 1283 }
adf2314f 1284
1751e8a6 1285 s->s_flags |= SB_ACTIVE;
f2aedb71 1286 error = 0;
0655960f
CL		 1287
1288out:
f2aedb71 1289 return error;
816724e6 1290
54ceac45
DH		 1291out_err_nosb:
1292 nfs_free_server(server);
0655960f 1293 goto out;
54ceac45 1294error_splat_super:
6f5bbff9 1295 deactivate_locked_super(s);
0655960f 1296 goto out;
f7b422b1
DH		 1297}
1298
54ceac45
DH		 1299/*
1300 * Destroy an NFS2/3 superblock
1301 */
fbdefd64 1302void nfs_kill_super(struct super_block *s)
f7b422b1
DH		 1303{
1304 struct nfs_server *server = NFS_SB(s);
7b14a213
CH		 1305 dev_t dev = s->s_dev;
1306
1307 generic_shutdown_super(s);
f7b422b1 1308
08734048 1309 nfs_fscache_release_super_cookie(s);
7b14a213 1310
54ceac45 1311 nfs_free_server(server);
7b14a213 1312 free_anon_bdev(dev);
f7b422b1 1313}
89d77c8f 1314EXPORT_SYMBOL_GPL(nfs_kill_super);
f7b422b1 1315
89d77c8f 1316#if IS_ENABLED(CONFIG_NFS_V4)
54ceac45 1317
fac1e8e4
BS		 1318/*
1319 * NFS v4 module parameters need to stay in the
1320 * NFS client for backwards compatibility
1321 */
1322unsigned int nfs_callback_set_tcpport;
5405fc44 1323unsigned short nfs_callback_nr_threads;
fac1e8e4
BS		 1324/* Default cache timeout is 10 minutes */
1325unsigned int nfs_idmap_cache_timeout = 600;
1326/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
1327bool nfs4_disable_idmapping = true;
1328unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
5405fc44 1329unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
fac1e8e4 1330unsigned short send_implementation_id = 1;
6f2ea7f2 1331char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
f6de7a39 1332bool recover_lost_locks = false;
fac1e8e4 1333
5405fc44 1334EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
89d77c8f 1335EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
89d77c8f
BS		 1336EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
1337EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
1338EXPORT_SYMBOL_GPL(max_session_slots);
5405fc44 1339EXPORT_SYMBOL_GPL(max_session_cb_slots);
89d77c8f 1340EXPORT_SYMBOL_GPL(send_implementation_id);
6f2ea7f2 1341EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
f6de7a39 1342EXPORT_SYMBOL_GPL(recover_lost_locks);
89d77c8f 1343
fac1e8e4
BS		 1344#define NFS_CALLBACK_MAXPORTNR (65535U)
1345
1346static int param_set_portnr(const char *val, const struct kernel_param *kp)
1347{
1348 unsigned long num;
1349 int ret;
1350
1351 if (!val)
1352 return -EINVAL;
7297cb68 1353 ret = kstrtoul(val, 0, &num);
379ebf07 1354 if (ret || num > NFS_CALLBACK_MAXPORTNR)
fac1e8e4
BS		 1355 return -EINVAL;
1356 *((unsigned int *)kp->arg) = num;
1357 return 0;
1358}
9c27847d 1359static const struct kernel_param_ops param_ops_portnr = {
fac1e8e4
BS		 1360 .set = param_set_portnr,
1361 .get = param_get_uint,
1362};
1363#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
1364
1365module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
5405fc44
TM		 1366module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
1367MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
1368 "assigned to the NFSv4 callback channels.");
fac1e8e4
BS		 1369module_param(nfs_idmap_cache_timeout, int, 0644);
1370module_param(nfs4_disable_idmapping, bool, 0644);
6f2ea7f2
CL		 1371module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
1372 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
fac1e8e4
BS		 1373MODULE_PARM_DESC(nfs4_disable_idmapping,
1374 "Turn off NFSv4 idmapping when using 'sec=sys'");
1375module_param(max_session_slots, ushort, 0644);
1376MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
1377 "requests the client will negotiate");
5405fc44 1378module_param(max_session_cb_slots, ushort, 0644);
f36ab161 1379MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
5405fc44 1380 "callbacks the client will process for a given server");
fac1e8e4
BS		 1381module_param(send_implementation_id, ushort, 0644);
1382MODULE_PARM_DESC(send_implementation_id,
1383 "Send implementation ID with NFSv4.1 exchange_id");
6f2ea7f2 1384MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
425e776d 1385
f6de7a39
TM		 1386module_param(recover_lost_locks, bool, 0644);
1387MODULE_PARM_DESC(recover_lost_locks,
1388 "If the server reports that a lock might be lost, "
1389 "try to recover it risking data corruption.");
1390
1391
54ceac45 1392#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)