1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/fs/nfs/super.c |
4 | * |
5 | * Copyright (C) 1992 Rick Sladkey |
6 | * |
7 | * nfs superblock handling functions |
8 | * |
9 | * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some |
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 | * |
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()) |
22 | */ |
23 | |
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> |
35 | #include <linux/sunrpc/addr.h> |
36 | #include <linux/sunrpc/stats.h> |
37 | #include <linux/sunrpc/metrics.h> |
38 | #include <linux/sunrpc/xprtsock.h> |
39 | #include <linux/sunrpc/xprtrdma.h> |
40 | #include <linux/nfs_fs.h> |
41 | #include <linux/nfs_mount.h> |
42 | #include <linux/nfs4_mount.h> |
43 | #include <linux/lockd/bind.h> |
44 | #include <linux/seq_file.h> |
45 | #include <linux/mount.h> |
46 | #include <linux/namei.h> |
47 | #include <linux/vfs.h> |
48 | #include <linux/inet.h> |
49 | #include <linux/in6.h> |
50 | #include <linux/slab.h> |
51 | #include <net/ipv6.h> |
52 | #include <linux/netdevice.h> |
53 | #include <linux/nfs_xdr.h> |
54 | #include <linux/magic.h> |
55 | #include <linux/parser.h> |
56 | #include <linux/nsproxy.h> |
57 | #include <linux/rcupdate.h> |
58 | |
59 | #include <linux/uaccess.h> |
60 | #include <linux/nfs_ssc.h> |
61 | |
62 | #include <uapi/linux/tls.h> |
63 | |
64 | #include "nfs4_fs.h" |
65 | #include "callback.h" |
66 | #include "delegation.h" |
67 | #include "iostat.h" |
68 | #include "internal.h" |
69 | #include "fscache.h" |
70 | #include "nfs4session.h" |
71 | #include "pnfs.h" |
72 | #include "nfs.h" |
73 | #include "netns.h" |
74 | #include "sysfs.h" |
75 | |
76 | #define NFSDBG_FACILITY NFSDBG_VFS |
77 | |
78 | const struct super_operations nfs_sops = { |
79 | .alloc_inode = nfs_alloc_inode, |
80 | .free_inode = nfs_free_inode, |
81 | .write_inode = nfs_write_inode, |
82 | .drop_inode = nfs_drop_inode, |
83 | .statfs = nfs_statfs, |
84 | .evict_inode = nfs_evict_inode, |
85 | .umount_begin = nfs_umount_begin, |
86 | .show_options = nfs_show_options, |
87 | .show_devname = nfs_show_devname, |
88 | .show_path = nfs_show_path, |
89 | .show_stats = nfs_show_stats, |
90 | }; |
91 | EXPORT_SYMBOL_GPL(nfs_sops); |
92 | |
93 | #ifdef CONFIG_NFS_V4_2 |
94 | static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = { |
95 | .sco_sb_deactive = nfs_sb_deactive, |
96 | }; |
97 | #endif |
98 | |
99 | #if IS_ENABLED(CONFIG_NFS_V4) |
100 | static int __init register_nfs4_fs(void) |
101 | { |
102 | return register_filesystem(&nfs4_fs_type); |
103 | } |
104 | |
105 | static void unregister_nfs4_fs(void) |
106 | { |
107 | unregister_filesystem(&nfs4_fs_type); |
108 | } |
109 | #else |
110 | static int __init register_nfs4_fs(void) |
111 | { |
112 | return 0; |
113 | } |
114 | |
115 | static void unregister_nfs4_fs(void) |
116 | { |
117 | } |
118 | #endif |
119 | |
120 | #ifdef CONFIG_NFS_V4_2 |
121 | static void nfs_ssc_register_ops(void) |
122 | { |
123 | nfs_ssc_register(ops: &nfs_ssc_clnt_ops_tbl); |
124 | } |
125 | |
126 | static void nfs_ssc_unregister_ops(void) |
127 | { |
128 | nfs_ssc_unregister(ops: &nfs_ssc_clnt_ops_tbl); |
129 | } |
130 | #endif /* CONFIG_NFS_V4_2 */ |
131 | |
132 | static struct shrinker *acl_shrinker; |
133 | |
134 | /* |
135 | * Register the NFS filesystems |
136 | */ |
137 | int __init register_nfs_fs(void) |
138 | { |
139 | int ret; |
140 | |
141 | ret = register_filesystem(&nfs_fs_type); |
142 | if (ret < 0) |
143 | goto error_0; |
144 | |
145 | ret = register_nfs4_fs(); |
146 | if (ret < 0) |
147 | goto error_1; |
148 | |
149 | ret = nfs_register_sysctl(); |
150 | if (ret < 0) |
151 | goto error_2; |
152 | |
153 | acl_shrinker = shrinker_alloc(flags: 0, fmt: "nfs-acl" ); |
154 | if (!acl_shrinker) { |
155 | ret = -ENOMEM; |
156 | goto error_3; |
157 | } |
158 | |
159 | acl_shrinker->count_objects = nfs_access_cache_count; |
160 | acl_shrinker->scan_objects = nfs_access_cache_scan; |
161 | |
162 | shrinker_register(shrinker: acl_shrinker); |
163 | |
164 | #ifdef CONFIG_NFS_V4_2 |
165 | nfs_ssc_register_ops(); |
166 | #endif |
167 | return 0; |
168 | error_3: |
169 | nfs_unregister_sysctl(); |
170 | error_2: |
171 | unregister_nfs4_fs(); |
172 | error_1: |
173 | unregister_filesystem(&nfs_fs_type); |
174 | error_0: |
175 | return ret; |
176 | } |
177 | |
178 | /* |
179 | * Unregister the NFS filesystems |
180 | */ |
181 | void __exit unregister_nfs_fs(void) |
182 | { |
183 | shrinker_free(shrinker: acl_shrinker); |
184 | nfs_unregister_sysctl(); |
185 | unregister_nfs4_fs(); |
186 | #ifdef CONFIG_NFS_V4_2 |
187 | nfs_ssc_unregister_ops(); |
188 | #endif |
189 | unregister_filesystem(&nfs_fs_type); |
190 | } |
191 | |
192 | bool nfs_sb_active(struct super_block *sb) |
193 | { |
194 | struct nfs_server *server = NFS_SB(s: sb); |
195 | |
196 | if (!atomic_inc_not_zero(v: &sb->s_active)) |
197 | return false; |
198 | if (atomic_inc_return(v: &server->active) != 1) |
199 | atomic_dec(v: &sb->s_active); |
200 | return true; |
201 | } |
202 | EXPORT_SYMBOL_GPL(nfs_sb_active); |
203 | |
204 | void nfs_sb_deactive(struct super_block *sb) |
205 | { |
206 | struct nfs_server *server = NFS_SB(s: sb); |
207 | |
208 | if (atomic_dec_and_test(v: &server->active)) |
209 | deactivate_super(sb); |
210 | } |
211 | EXPORT_SYMBOL_GPL(nfs_sb_deactive); |
212 | |
213 | static int __nfs_list_for_each_server(struct list_head *head, |
214 | int (*fn)(struct nfs_server *, void *), |
215 | void *data) |
216 | { |
217 | struct nfs_server *server, *last = NULL; |
218 | int ret = 0; |
219 | |
220 | rcu_read_lock(); |
221 | list_for_each_entry_rcu(server, head, client_link) { |
222 | if (!(server->super && nfs_sb_active(server->super))) |
223 | continue; |
224 | rcu_read_unlock(); |
225 | if (last) |
226 | nfs_sb_deactive(last->super); |
227 | last = server; |
228 | ret = fn(server, data); |
229 | if (ret) |
230 | goto out; |
231 | rcu_read_lock(); |
232 | } |
233 | rcu_read_unlock(); |
234 | out: |
235 | if (last) |
236 | nfs_sb_deactive(last->super); |
237 | return ret; |
238 | } |
239 | |
240 | int nfs_client_for_each_server(struct nfs_client *clp, |
241 | int (*fn)(struct nfs_server *, void *), |
242 | void *data) |
243 | { |
244 | return __nfs_list_for_each_server(head: &clp->cl_superblocks, fn, data); |
245 | } |
246 | EXPORT_SYMBOL_GPL(nfs_client_for_each_server); |
247 | |
248 | /* |
249 | * Deliver file system statistics to userspace |
250 | */ |
251 | int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
252 | { |
253 | struct nfs_server *server = NFS_SB(s: dentry->d_sb); |
254 | unsigned char blockbits; |
255 | unsigned long blockres; |
256 | struct nfs_fh *fh = NFS_FH(inode: d_inode(dentry)); |
257 | struct nfs_fsstat res; |
258 | int error = -ENOMEM; |
259 | |
260 | res.fattr = nfs_alloc_fattr(); |
261 | if (res.fattr == NULL) |
262 | goto out_err; |
263 | |
264 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
265 | if (unlikely(error == -ESTALE)) { |
266 | struct dentry *pd_dentry; |
267 | |
268 | pd_dentry = dget_parent(dentry); |
269 | nfs_zap_caches(d_inode(dentry: pd_dentry)); |
270 | dput(pd_dentry); |
271 | } |
272 | nfs_free_fattr(fattr: res.fattr); |
273 | if (error < 0) |
274 | goto out_err; |
275 | |
276 | buf->f_type = NFS_SUPER_MAGIC; |
277 | |
278 | /* |
279 | * Current versions of glibc do not correctly handle the |
280 | * case where f_frsize != f_bsize. Eventually we want to |
281 | * report the value of wtmult in this field. |
282 | */ |
283 | buf->f_frsize = dentry->d_sb->s_blocksize; |
284 | |
285 | /* |
286 | * On most *nix systems, f_blocks, f_bfree, and f_bavail |
287 | * are reported in units of f_frsize. Linux hasn't had |
288 | * an f_frsize field in its statfs struct until recently, |
289 | * thus historically Linux's sys_statfs reports these |
290 | * fields in units of f_bsize. |
291 | */ |
292 | buf->f_bsize = dentry->d_sb->s_blocksize; |
293 | blockbits = dentry->d_sb->s_blocksize_bits; |
294 | blockres = (1 << blockbits) - 1; |
295 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; |
296 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; |
297 | buf->f_bavail = (res.abytes + blockres) >> blockbits; |
298 | |
299 | buf->f_files = res.tfiles; |
300 | buf->f_ffree = res.afiles; |
301 | |
302 | buf->f_namelen = server->namelen; |
303 | |
304 | return 0; |
305 | |
306 | out_err: |
307 | dprintk("%s: statfs error = %d\n" , __func__, -error); |
308 | return error; |
309 | } |
310 | EXPORT_SYMBOL_GPL(nfs_statfs); |
311 | |
312 | /* |
313 | * Map the security flavour number to a name |
314 | */ |
315 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
316 | { |
317 | static const struct { |
318 | rpc_authflavor_t flavour; |
319 | const char *str; |
320 | } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { |
321 | /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ |
322 | { RPC_AUTH_NULL, "null" }, |
323 | { RPC_AUTH_UNIX, "sys" }, |
324 | { RPC_AUTH_GSS_KRB5, "krb5" }, |
325 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, |
326 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, |
327 | { RPC_AUTH_GSS_LKEY, "lkey" }, |
328 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, |
329 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, |
330 | { RPC_AUTH_GSS_SPKM, "spkm" }, |
331 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, |
332 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, |
333 | { UINT_MAX, "unknown" } |
334 | }; |
335 | int i; |
336 | |
337 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
338 | if (sec_flavours[i].flavour == flavour) |
339 | break; |
340 | } |
341 | return sec_flavours[i].str; |
342 | } |
343 | |
344 | static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, |
345 | int showdefaults) |
346 | { |
347 | struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; |
348 | char *proto = NULL; |
349 | |
350 | switch (sap->sa_family) { |
351 | case AF_INET: |
352 | switch (nfss->mountd_protocol) { |
353 | case IPPROTO_UDP: |
354 | proto = RPCBIND_NETID_UDP; |
355 | break; |
356 | case IPPROTO_TCP: |
357 | proto = RPCBIND_NETID_TCP; |
358 | break; |
359 | } |
360 | break; |
361 | case AF_INET6: |
362 | switch (nfss->mountd_protocol) { |
363 | case IPPROTO_UDP: |
364 | proto = RPCBIND_NETID_UDP6; |
365 | break; |
366 | case IPPROTO_TCP: |
367 | proto = RPCBIND_NETID_TCP6; |
368 | break; |
369 | } |
370 | break; |
371 | } |
372 | if (proto || showdefaults) |
373 | seq_printf(m, fmt: ",mountproto=%s" , proto ?: "auto" ); |
374 | } |
375 | |
376 | static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
377 | int showdefaults) |
378 | { |
379 | struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; |
380 | |
381 | if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) |
382 | return; |
383 | |
384 | switch (sap->sa_family) { |
385 | case AF_INET: { |
386 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; |
387 | seq_printf(m, fmt: ",mountaddr=%pI4" , &sin->sin_addr.s_addr); |
388 | break; |
389 | } |
390 | case AF_INET6: { |
391 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; |
392 | seq_printf(m, fmt: ",mountaddr=%pI6c" , &sin6->sin6_addr); |
393 | break; |
394 | } |
395 | default: |
396 | if (showdefaults) |
397 | seq_puts(m, s: ",mountaddr=unspecified" ); |
398 | } |
399 | |
400 | if (nfss->mountd_version || showdefaults) |
401 | seq_printf(m, fmt: ",mountvers=%u" , nfss->mountd_version); |
402 | if ((nfss->mountd_port && |
403 | nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || |
404 | showdefaults) |
405 | seq_printf(m, fmt: ",mountport=%u" , nfss->mountd_port); |
406 | |
407 | nfs_show_mountd_netid(m, nfss, showdefaults); |
408 | } |
409 | |
410 | #if IS_ENABLED(CONFIG_NFS_V4) |
411 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, |
412 | int showdefaults) |
413 | { |
414 | struct nfs_client *clp = nfss->nfs_client; |
415 | |
416 | seq_printf(m, fmt: ",clientaddr=%s" , clp->cl_ipaddr); |
417 | } |
418 | #else |
419 | static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, |
420 | int showdefaults) |
421 | { |
422 | } |
423 | #endif |
424 | |
425 | static void nfs_show_nfs_version(struct seq_file *m, |
426 | unsigned int version, |
427 | unsigned int minorversion) |
428 | { |
429 | seq_printf(m, fmt: ",vers=%u" , version); |
430 | if (version == 4) |
431 | seq_printf(m, fmt: ".%u" , minorversion); |
432 | } |
433 | |
434 | /* |
435 | * Describe the mount options in force on this server representation |
436 | */ |
437 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
438 | int showdefaults) |
439 | { |
440 | static const struct proc_nfs_info { |
441 | int flag; |
442 | const char *str; |
443 | const char *nostr; |
444 | } nfs_info[] = { |
445 | { NFS_MOUNT_SOFT, ",soft" , "" }, |
446 | { NFS_MOUNT_SOFTERR, ",softerr" , "" }, |
447 | { NFS_MOUNT_SOFTREVAL, ",softreval" , "" }, |
448 | { NFS_MOUNT_POSIX, ",posix" , "" }, |
449 | { NFS_MOUNT_NOCTO, ",nocto" , "" }, |
450 | { NFS_MOUNT_NOAC, ",noac" , "" }, |
451 | { NFS_MOUNT_NONLM, ",nolock" , "" }, |
452 | { NFS_MOUNT_NOACL, ",noacl" , "" }, |
453 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus" , "" }, |
454 | { NFS_MOUNT_UNSHARED, ",nosharecache" , "" }, |
455 | { NFS_MOUNT_NORESVPORT, ",noresvport" , "" }, |
456 | { 0, NULL, NULL } |
457 | }; |
458 | const struct proc_nfs_info *nfs_infop; |
459 | struct nfs_client *clp = nfss->nfs_client; |
460 | u32 version = clp->rpc_ops->version; |
461 | int local_flock, local_fcntl; |
462 | |
463 | nfs_show_nfs_version(m, version, minorversion: clp->cl_minorversion); |
464 | seq_printf(m, fmt: ",rsize=%u" , nfss->rsize); |
465 | seq_printf(m, fmt: ",wsize=%u" , nfss->wsize); |
466 | if (nfss->bsize != 0) |
467 | seq_printf(m, fmt: ",bsize=%u" , nfss->bsize); |
468 | seq_printf(m, fmt: ",namlen=%u" , nfss->namelen); |
469 | if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
470 | seq_printf(m, fmt: ",acregmin=%u" , nfss->acregmin/HZ); |
471 | if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
472 | seq_printf(m, fmt: ",acregmax=%u" , nfss->acregmax/HZ); |
473 | if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
474 | seq_printf(m, fmt: ",acdirmin=%u" , nfss->acdirmin/HZ); |
475 | if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
476 | seq_printf(m, fmt: ",acdirmax=%u" , nfss->acdirmax/HZ); |
477 | if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) |
478 | seq_puts(m, s: ",hard" ); |
479 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
480 | if (nfss->flags & nfs_infop->flag) |
481 | seq_puts(m, s: nfs_infop->str); |
482 | else |
483 | seq_puts(m, s: nfs_infop->nostr); |
484 | } |
485 | rcu_read_lock(); |
486 | seq_printf(m, fmt: ",proto=%s" , |
487 | rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); |
488 | rcu_read_unlock(); |
489 | if (clp->cl_nconnect > 0) |
490 | seq_printf(m, fmt: ",nconnect=%u" , clp->cl_nconnect); |
491 | if (version == 4) { |
492 | if (clp->cl_max_connect > 1) |
493 | seq_printf(m, fmt: ",max_connect=%u" , clp->cl_max_connect); |
494 | if (nfss->port != NFS_PORT) |
495 | seq_printf(m, fmt: ",port=%u" , nfss->port); |
496 | } else |
497 | if (nfss->port) |
498 | seq_printf(m, fmt: ",port=%u" , nfss->port); |
499 | |
500 | seq_printf(m, fmt: ",timeo=%lu" , 10U * nfss->client->cl_timeout->to_initval / HZ); |
501 | seq_printf(m, fmt: ",retrans=%u" , nfss->client->cl_timeout->to_retries); |
502 | seq_printf(m, fmt: ",sec=%s" , nfs_pseudoflavour_to_name(flavour: nfss->client->cl_auth->au_flavor)); |
503 | switch (clp->cl_xprtsec.policy) { |
504 | case RPC_XPRTSEC_TLS_ANON: |
505 | seq_puts(m, s: ",xprtsec=tls" ); |
506 | break; |
507 | case RPC_XPRTSEC_TLS_X509: |
508 | seq_puts(m, s: ",xprtsec=mtls" ); |
509 | break; |
510 | default: |
511 | break; |
512 | } |
513 | |
514 | if (version != 4) |
515 | nfs_show_mountd_options(m, nfss, showdefaults); |
516 | else |
517 | nfs_show_nfsv4_options(m, nfss, showdefaults); |
518 | |
519 | if (nfss->options & NFS_OPTION_FSCACHE) |
520 | seq_puts(m, s: ",fsc" ); |
521 | |
522 | if (nfss->options & NFS_OPTION_MIGRATION) |
523 | seq_puts(m, s: ",migration" ); |
524 | |
525 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { |
526 | if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
527 | seq_puts(m, s: ",lookupcache=none" ); |
528 | else |
529 | seq_puts(m, s: ",lookupcache=pos" ); |
530 | } |
531 | |
532 | local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; |
533 | local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; |
534 | |
535 | if (!local_flock && !local_fcntl) |
536 | seq_puts(m, s: ",local_lock=none" ); |
537 | else if (local_flock && local_fcntl) |
538 | seq_puts(m, s: ",local_lock=all" ); |
539 | else if (local_flock) |
540 | seq_puts(m, s: ",local_lock=flock" ); |
541 | else |
542 | seq_puts(m, s: ",local_lock=posix" ); |
543 | |
544 | if (nfss->flags & NFS_MOUNT_WRITE_EAGER) { |
545 | if (nfss->flags & NFS_MOUNT_WRITE_WAIT) |
546 | seq_puts(m, s: ",write=wait" ); |
547 | else |
548 | seq_puts(m, s: ",write=eager" ); |
549 | } |
550 | } |
551 | |
552 | /* |
553 | * Describe the mount options on this VFS mountpoint |
554 | */ |
555 | int nfs_show_options(struct seq_file *m, struct dentry *root) |
556 | { |
557 | struct nfs_server *nfss = NFS_SB(s: root->d_sb); |
558 | |
559 | nfs_show_mount_options(m, nfss, showdefaults: 0); |
560 | |
561 | rcu_read_lock(); |
562 | seq_printf(m, fmt: ",addr=%s" , |
563 | rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, |
564 | RPC_DISPLAY_ADDR)); |
565 | rcu_read_unlock(); |
566 | |
567 | return 0; |
568 | } |
569 | EXPORT_SYMBOL_GPL(nfs_show_options); |
570 | |
571 | #if IS_ENABLED(CONFIG_NFS_V4) |
572 | static void show_lease(struct seq_file *m, struct nfs_server *server) |
573 | { |
574 | struct nfs_client *clp = server->nfs_client; |
575 | unsigned long expire; |
576 | |
577 | seq_printf(m, fmt: ",lease_time=%ld" , clp->cl_lease_time / HZ); |
578 | expire = clp->cl_last_renewal + clp->cl_lease_time; |
579 | seq_printf(m, fmt: ",lease_expired=%ld" , |
580 | time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); |
581 | } |
582 | #ifdef CONFIG_NFS_V4_1 |
583 | static void show_sessions(struct seq_file *m, struct nfs_server *server) |
584 | { |
585 | if (nfs4_has_session(clp: server->nfs_client)) |
586 | seq_puts(m, s: ",sessions" ); |
587 | } |
588 | #else |
589 | static void show_sessions(struct seq_file *m, struct nfs_server *server) {} |
590 | #endif |
591 | #endif |
592 | |
593 | #ifdef CONFIG_NFS_V4_1 |
594 | static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
595 | { |
596 | seq_printf(m, fmt: ",pnfs=" ); |
597 | if (server->pnfs_curr_ld) |
598 | seq_printf(m, fmt: "%s" , server->pnfs_curr_ld->name); |
599 | else |
600 | seq_printf(m, fmt: "not configured" ); |
601 | } |
602 | |
603 | static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
604 | { |
605 | if (nfss->nfs_client && nfss->nfs_client->cl_implid) { |
606 | struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; |
607 | seq_printf(m, fmt: "\n\timpl_id:\tname='%s',domain='%s'," |
608 | "date='%llu,%u'" , |
609 | impl_id->name, impl_id->domain, |
610 | impl_id->date.seconds, impl_id->date.nseconds); |
611 | } |
612 | } |
613 | #else |
614 | #if IS_ENABLED(CONFIG_NFS_V4) |
615 | static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
616 | { |
617 | } |
618 | #endif |
619 | static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
620 | { |
621 | } |
622 | #endif |
623 | |
624 | int nfs_show_devname(struct seq_file *m, struct dentry *root) |
625 | { |
626 | char *page = (char *) __get_free_page(GFP_KERNEL); |
627 | char *devname, *dummy; |
628 | int err = 0; |
629 | if (!page) |
630 | return -ENOMEM; |
631 | devname = nfs_path(p: &dummy, dentry: root, buffer: page, PAGE_SIZE, flags: 0); |
632 | if (IS_ERR(ptr: devname)) |
633 | err = PTR_ERR(ptr: devname); |
634 | else |
635 | seq_escape(m, s: devname, esc: " \t\n\\" ); |
636 | free_page((unsigned long)page); |
637 | return err; |
638 | } |
639 | EXPORT_SYMBOL_GPL(nfs_show_devname); |
640 | |
641 | int nfs_show_path(struct seq_file *m, struct dentry *dentry) |
642 | { |
643 | seq_puts(m, s: "/" ); |
644 | return 0; |
645 | } |
646 | EXPORT_SYMBOL_GPL(nfs_show_path); |
647 | |
648 | /* |
649 | * Present statistical information for this VFS mountpoint |
650 | */ |
651 | int nfs_show_stats(struct seq_file *m, struct dentry *root) |
652 | { |
653 | int i, cpu; |
654 | struct nfs_server *nfss = NFS_SB(s: root->d_sb); |
655 | struct rpc_auth *auth = nfss->client->cl_auth; |
656 | struct nfs_iostats totals = { }; |
657 | |
658 | seq_printf(m, fmt: "statvers=%s" , NFS_IOSTAT_VERS); |
659 | |
660 | /* |
661 | * Display all mount option settings |
662 | */ |
663 | seq_puts(m, s: "\n\topts:\t" ); |
664 | seq_puts(m, s: sb_rdonly(sb: root->d_sb) ? "ro" : "rw" ); |
665 | seq_puts(m, s: root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "" ); |
666 | seq_puts(m, s: root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "" ); |
667 | seq_puts(m, s: root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "" ); |
668 | nfs_show_mount_options(m, nfss, showdefaults: 1); |
669 | |
670 | seq_printf(m, fmt: "\n\tage:\t%lu" , (jiffies - nfss->mount_time) / HZ); |
671 | |
672 | show_implementation_id(m, nfss); |
673 | |
674 | seq_puts(m, s: "\n\tcaps:\t" ); |
675 | seq_printf(m, fmt: "caps=0x%x" , nfss->caps); |
676 | seq_printf(m, fmt: ",wtmult=%u" , nfss->wtmult); |
677 | seq_printf(m, fmt: ",dtsize=%u" , nfss->dtsize); |
678 | seq_printf(m, fmt: ",bsize=%u" , nfss->bsize); |
679 | seq_printf(m, fmt: ",namlen=%u" , nfss->namelen); |
680 | |
681 | #if IS_ENABLED(CONFIG_NFS_V4) |
682 | if (nfss->nfs_client->rpc_ops->version == 4) { |
683 | seq_puts(m, s: "\n\tnfsv4:\t" ); |
684 | seq_printf(m, fmt: "bm0=0x%x" , nfss->attr_bitmask[0]); |
685 | seq_printf(m, fmt: ",bm1=0x%x" , nfss->attr_bitmask[1]); |
686 | seq_printf(m, fmt: ",bm2=0x%x" , nfss->attr_bitmask[2]); |
687 | seq_printf(m, fmt: ",acl=0x%x" , nfss->acl_bitmask); |
688 | show_sessions(m, server: nfss); |
689 | show_pnfs(m, server: nfss); |
690 | show_lease(m, server: nfss); |
691 | } |
692 | #endif |
693 | |
694 | /* |
695 | * Display security flavor in effect for this mount |
696 | */ |
697 | seq_printf(m, fmt: "\n\tsec:\tflavor=%u" , auth->au_ops->au_flavor); |
698 | if (auth->au_flavor) |
699 | seq_printf(m, fmt: ",pseudoflavor=%u" , auth->au_flavor); |
700 | |
701 | /* |
702 | * Display superblock I/O counters |
703 | */ |
704 | for_each_possible_cpu(cpu) { |
705 | struct nfs_iostats *stats; |
706 | |
707 | preempt_disable(); |
708 | stats = per_cpu_ptr(nfss->io_stats, cpu); |
709 | |
710 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) |
711 | totals.events[i] += stats->events[i]; |
712 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) |
713 | totals.bytes[i] += stats->bytes[i]; |
714 | |
715 | preempt_enable(); |
716 | } |
717 | |
718 | seq_puts(m, s: "\n\tevents:\t" ); |
719 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) |
720 | seq_printf(m, fmt: "%lu " , totals.events[i]); |
721 | seq_puts(m, s: "\n\tbytes:\t" ); |
722 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) |
723 | seq_printf(m, fmt: "%Lu " , totals.bytes[i]); |
724 | seq_putc(m, c: '\n'); |
725 | |
726 | rpc_clnt_show_stats(m, nfss->client); |
727 | |
728 | return 0; |
729 | } |
730 | EXPORT_SYMBOL_GPL(nfs_show_stats); |
731 | |
732 | /* |
733 | * Begin unmount by attempting to remove all automounted mountpoints we added |
734 | * in response to xdev traversals and referrals |
735 | */ |
736 | void nfs_umount_begin(struct super_block *sb) |
737 | { |
738 | struct nfs_server *server; |
739 | struct rpc_clnt *rpc; |
740 | |
741 | server = NFS_SB(s: sb); |
742 | /* -EIO all pending I/O */ |
743 | rpc = server->client_acl; |
744 | if (!IS_ERR(ptr: rpc)) |
745 | rpc_killall_tasks(rpc); |
746 | rpc = server->client; |
747 | if (!IS_ERR(ptr: rpc)) |
748 | rpc_killall_tasks(rpc); |
749 | } |
750 | EXPORT_SYMBOL_GPL(nfs_umount_begin); |
751 | |
752 | /* |
753 | * Return true if 'match' is in auth_info or auth_info is empty. |
754 | * Return false otherwise. |
755 | */ |
756 | bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, |
757 | rpc_authflavor_t match) |
758 | { |
759 | int i; |
760 | |
761 | if (!auth_info->flavor_len) |
762 | return true; |
763 | |
764 | for (i = 0; i < auth_info->flavor_len; i++) { |
765 | if (auth_info->flavors[i] == match) |
766 | return true; |
767 | } |
768 | return false; |
769 | } |
770 | EXPORT_SYMBOL_GPL(nfs_auth_info_match); |
771 | |
772 | /* |
773 | * Ensure that a specified authtype in ctx->auth_info is supported by |
774 | * the server. Returns 0 and sets ctx->selected_flavor if it's ok, and |
775 | * -EACCES if not. |
776 | */ |
777 | static int nfs_verify_authflavors(struct nfs_fs_context *ctx, |
778 | rpc_authflavor_t *server_authlist, |
779 | unsigned int count) |
780 | { |
781 | rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; |
782 | bool found_auth_null = false; |
783 | unsigned int i; |
784 | |
785 | /* |
786 | * If the sec= mount option is used, the specified flavor or AUTH_NULL |
787 | * must be in the list returned by the server. |
788 | * |
789 | * AUTH_NULL has a special meaning when it's in the server list - it |
790 | * means that the server will ignore the rpc creds, so any flavor |
791 | * can be used but still use the sec= that was specified. |
792 | * |
793 | * Note also that the MNT procedure in MNTv1 does not return a list |
794 | * of supported security flavors. In this case, nfs_mount() fabricates |
795 | * a security flavor list containing just AUTH_NULL. |
796 | */ |
797 | for (i = 0; i < count; i++) { |
798 | flavor = server_authlist[i]; |
799 | |
800 | if (nfs_auth_info_match(&ctx->auth_info, flavor)) |
801 | goto out; |
802 | |
803 | if (flavor == RPC_AUTH_NULL) |
804 | found_auth_null = true; |
805 | } |
806 | |
807 | if (found_auth_null) { |
808 | flavor = ctx->auth_info.flavors[0]; |
809 | goto out; |
810 | } |
811 | |
812 | dfprintk(MOUNT, |
813 | "NFS: specified auth flavors not supported by server\n" ); |
814 | return -EACCES; |
815 | |
816 | out: |
817 | ctx->selected_flavor = flavor; |
818 | dfprintk(MOUNT, "NFS: using auth flavor %u\n" , ctx->selected_flavor); |
819 | return 0; |
820 | } |
821 | |
822 | /* |
823 | * Use the remote server's MOUNT service to request the NFS file handle |
824 | * corresponding to the provided path. |
825 | */ |
826 | static int nfs_request_mount(struct fs_context *fc, |
827 | struct nfs_fh *root_fh, |
828 | rpc_authflavor_t *server_authlist, |
829 | unsigned int *server_authlist_len) |
830 | { |
831 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
832 | struct nfs_mount_request request = { |
833 | .sap = &ctx->mount_server._address, |
834 | .dirpath = ctx->nfs_server.export_path, |
835 | .protocol = ctx->mount_server.protocol, |
836 | .fh = root_fh, |
837 | .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT, |
838 | .auth_flav_len = server_authlist_len, |
839 | .auth_flavs = server_authlist, |
840 | .net = fc->net_ns, |
841 | }; |
842 | int status; |
843 | |
844 | if (ctx->mount_server.version == 0) { |
845 | switch (ctx->version) { |
846 | default: |
847 | ctx->mount_server.version = NFS_MNT3_VERSION; |
848 | break; |
849 | case 2: |
850 | ctx->mount_server.version = NFS_MNT_VERSION; |
851 | } |
852 | } |
853 | request.version = ctx->mount_server.version; |
854 | |
855 | if (ctx->mount_server.hostname) |
856 | request.hostname = ctx->mount_server.hostname; |
857 | else |
858 | request.hostname = ctx->nfs_server.hostname; |
859 | |
860 | /* |
861 | * Construct the mount server's address. |
862 | */ |
863 | if (ctx->mount_server.address.sa_family == AF_UNSPEC) { |
864 | memcpy(request.sap, &ctx->nfs_server._address, |
865 | ctx->nfs_server.addrlen); |
866 | ctx->mount_server.addrlen = ctx->nfs_server.addrlen; |
867 | } |
868 | request.salen = ctx->mount_server.addrlen; |
869 | nfs_set_port(sap: request.sap, port: &ctx->mount_server.port, default_port: 0); |
870 | |
871 | /* |
872 | * Now ask the mount server to map our export path |
873 | * to a file handle. |
874 | */ |
875 | status = nfs_mount(info: &request, timeo: ctx->timeo, retrans: ctx->retrans); |
876 | if (status != 0) { |
877 | dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n" , |
878 | request.hostname, status); |
879 | return status; |
880 | } |
881 | |
882 | return 0; |
883 | } |
884 | |
885 | static struct nfs_server *nfs_try_mount_request(struct fs_context *fc) |
886 | { |
887 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
888 | int status; |
889 | unsigned int i; |
890 | bool tried_auth_unix = false; |
891 | bool auth_null_in_list = false; |
892 | struct nfs_server *server = ERR_PTR(error: -EACCES); |
893 | rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; |
894 | unsigned int authlist_len = ARRAY_SIZE(authlist); |
895 | |
896 | status = nfs_request_mount(fc, root_fh: ctx->mntfh, server_authlist: authlist, server_authlist_len: &authlist_len); |
897 | if (status) |
898 | return ERR_PTR(error: status); |
899 | |
900 | /* |
901 | * Was a sec= authflavor specified in the options? First, verify |
902 | * whether the server supports it, and then just try to use it if so. |
903 | */ |
904 | if (ctx->auth_info.flavor_len > 0) { |
905 | status = nfs_verify_authflavors(ctx, server_authlist: authlist, count: authlist_len); |
906 | dfprintk(MOUNT, "NFS: using auth flavor %u\n" , |
907 | ctx->selected_flavor); |
908 | if (status) |
909 | return ERR_PTR(error: status); |
910 | return ctx->nfs_mod->rpc_ops->create_server(fc); |
911 | } |
912 | |
913 | /* |
914 | * No sec= option was provided. RFC 2623, section 2.7 suggests we |
915 | * SHOULD prefer the flavor listed first. However, some servers list |
916 | * AUTH_NULL first. Avoid ever choosing AUTH_NULL. |
917 | */ |
918 | for (i = 0; i < authlist_len; ++i) { |
919 | rpc_authflavor_t flavor; |
920 | struct rpcsec_gss_info info; |
921 | |
922 | flavor = authlist[i]; |
923 | switch (flavor) { |
924 | case RPC_AUTH_UNIX: |
925 | tried_auth_unix = true; |
926 | break; |
927 | case RPC_AUTH_NULL: |
928 | auth_null_in_list = true; |
929 | continue; |
930 | default: |
931 | if (rpcauth_get_gssinfo(flavor, &info) != 0) |
932 | continue; |
933 | break; |
934 | } |
935 | dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n" , flavor); |
936 | ctx->selected_flavor = flavor; |
937 | server = ctx->nfs_mod->rpc_ops->create_server(fc); |
938 | if (!IS_ERR(ptr: server)) |
939 | return server; |
940 | } |
941 | |
942 | /* |
943 | * Nothing we tried so far worked. At this point, give up if we've |
944 | * already tried AUTH_UNIX or if the server's list doesn't contain |
945 | * AUTH_NULL |
946 | */ |
947 | if (tried_auth_unix || !auth_null_in_list) |
948 | return server; |
949 | |
950 | /* Last chance! Try AUTH_UNIX */ |
951 | dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n" , RPC_AUTH_UNIX); |
952 | ctx->selected_flavor = RPC_AUTH_UNIX; |
953 | return ctx->nfs_mod->rpc_ops->create_server(fc); |
954 | } |
955 | |
956 | int nfs_try_get_tree(struct fs_context *fc) |
957 | { |
958 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
959 | |
960 | if (ctx->need_mount) |
961 | ctx->server = nfs_try_mount_request(fc); |
962 | else |
963 | ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc); |
964 | |
965 | return nfs_get_tree_common(fc); |
966 | } |
967 | EXPORT_SYMBOL_GPL(nfs_try_get_tree); |
968 | |
969 | |
970 | #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ |
971 | | NFS_MOUNT_SECURE \ |
972 | | NFS_MOUNT_TCP \ |
973 | | NFS_MOUNT_VER3 \ |
974 | | NFS_MOUNT_KERBEROS \ |
975 | | NFS_MOUNT_NONLM \ |
976 | | NFS_MOUNT_BROKEN_SUID \ |
977 | | NFS_MOUNT_STRICTLOCK \ |
978 | | NFS_MOUNT_LEGACY_INTERFACE) |
979 | |
980 | #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ |
981 | ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) |
982 | |
983 | static int |
984 | nfs_compare_remount_data(struct nfs_server *nfss, |
985 | struct nfs_fs_context *ctx) |
986 | { |
987 | if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || |
988 | ctx->rsize != nfss->rsize || |
989 | ctx->wsize != nfss->wsize || |
990 | ctx->version != nfss->nfs_client->rpc_ops->version || |
991 | ctx->minorversion != nfss->nfs_client->cl_minorversion || |
992 | ctx->retrans != nfss->client->cl_timeout->to_retries || |
993 | !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) || |
994 | ctx->acregmin != nfss->acregmin / HZ || |
995 | ctx->acregmax != nfss->acregmax / HZ || |
996 | ctx->acdirmin != nfss->acdirmin / HZ || |
997 | ctx->acdirmax != nfss->acdirmax / HZ || |
998 | ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || |
999 | (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) || |
1000 | ctx->nfs_server.port != nfss->port || |
1001 | ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || |
1002 | !rpc_cmp_addr(sap1: (struct sockaddr *)&ctx->nfs_server.address, |
1003 | sap2: (struct sockaddr *)&nfss->nfs_client->cl_addr)) |
1004 | return -EINVAL; |
1005 | |
1006 | return 0; |
1007 | } |
1008 | |
1009 | int nfs_reconfigure(struct fs_context *fc) |
1010 | { |
1011 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
1012 | struct super_block *sb = fc->root->d_sb; |
1013 | struct nfs_server *nfss = sb->s_fs_info; |
1014 | int ret; |
1015 | |
1016 | sync_filesystem(sb); |
1017 | |
1018 | /* |
1019 | * Userspace mount programs that send binary options generally send |
1020 | * them populated with default values. We have no way to know which |
1021 | * ones were explicitly specified. Fall back to legacy behavior and |
1022 | * just return success. |
1023 | */ |
1024 | if (ctx->skip_reconfig_option_check) |
1025 | return 0; |
1026 | |
1027 | /* |
1028 | * noac is a special case. It implies -o sync, but that's not |
1029 | * necessarily reflected in the mtab options. reconfigure_super |
1030 | * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the |
1031 | * remount options, so we have to explicitly reset it. |
1032 | */ |
1033 | if (ctx->flags & NFS_MOUNT_NOAC) { |
1034 | fc->sb_flags |= SB_SYNCHRONOUS; |
1035 | fc->sb_flags_mask |= SB_SYNCHRONOUS; |
1036 | } |
1037 | |
1038 | /* compare new mount options with old ones */ |
1039 | ret = nfs_compare_remount_data(nfss, ctx); |
1040 | if (ret) |
1041 | return ret; |
1042 | |
1043 | return nfs_probe_server(nfss, NFS_FH(inode: d_inode(dentry: fc->root))); |
1044 | } |
1045 | EXPORT_SYMBOL_GPL(nfs_reconfigure); |
1046 | |
1047 | /* |
1048 | * Finish setting up an NFS superblock |
1049 | */ |
1050 | static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) |
1051 | { |
1052 | struct nfs_server *server = NFS_SB(s: sb); |
1053 | |
1054 | sb->s_blocksize_bits = 0; |
1055 | sb->s_blocksize = 0; |
1056 | sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; |
1057 | sb->s_op = server->nfs_client->cl_nfs_mod->sops; |
1058 | if (ctx->bsize) |
1059 | sb->s_blocksize = nfs_block_size(bsize: ctx->bsize, nrbitsp: &sb->s_blocksize_bits); |
1060 | |
1061 | switch (server->nfs_client->rpc_ops->version) { |
1062 | case 2: |
1063 | sb->s_time_gran = 1000; |
1064 | sb->s_time_min = 0; |
1065 | sb->s_time_max = U32_MAX; |
1066 | break; |
1067 | case 3: |
1068 | /* |
1069 | * The VFS shouldn't apply the umask to mode bits. |
1070 | * We will do so ourselves when necessary. |
1071 | */ |
1072 | sb->s_flags |= SB_POSIXACL; |
1073 | sb->s_time_gran = 1; |
1074 | sb->s_time_min = 0; |
1075 | sb->s_time_max = U32_MAX; |
1076 | sb->s_export_op = &nfs_export_ops; |
1077 | break; |
1078 | case 4: |
1079 | sb->s_iflags |= SB_I_NOUMASK; |
1080 | sb->s_time_gran = 1; |
1081 | sb->s_time_min = S64_MIN; |
1082 | sb->s_time_max = S64_MAX; |
1083 | if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) |
1084 | sb->s_export_op = &nfs_export_ops; |
1085 | break; |
1086 | } |
1087 | |
1088 | sb->s_magic = NFS_SUPER_MAGIC; |
1089 | |
1090 | /* We probably want something more informative here */ |
1091 | snprintf(buf: sb->s_id, size: sizeof(sb->s_id), |
1092 | fmt: "%u:%u" , MAJOR(sb->s_dev), MINOR(sb->s_dev)); |
1093 | |
1094 | if (sb->s_blocksize == 0) |
1095 | sb->s_blocksize = nfs_block_bits(bsize: server->wsize, |
1096 | nrbitsp: &sb->s_blocksize_bits); |
1097 | |
1098 | nfs_super_set_maxbytes(sb, maxfilesize: server->maxfilesize); |
1099 | nfs_sysfs_move_server_to_sb(s: sb); |
1100 | server->has_sec_mnt_opts = ctx->has_sec_mnt_opts; |
1101 | } |
1102 | |
1103 | static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, |
1104 | const struct fs_context *fc) |
1105 | { |
1106 | const struct nfs_server *a = s->s_fs_info; |
1107 | const struct rpc_clnt *clnt_a = a->client; |
1108 | const struct rpc_clnt *clnt_b = b->client; |
1109 | |
1110 | if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK)) |
1111 | goto Ebusy; |
1112 | if (a->nfs_client != b->nfs_client) |
1113 | goto Ebusy; |
1114 | if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) |
1115 | goto Ebusy; |
1116 | if (a->wsize != b->wsize) |
1117 | goto Ebusy; |
1118 | if (a->rsize != b->rsize) |
1119 | goto Ebusy; |
1120 | if (a->acregmin != b->acregmin) |
1121 | goto Ebusy; |
1122 | if (a->acregmax != b->acregmax) |
1123 | goto Ebusy; |
1124 | if (a->acdirmin != b->acdirmin) |
1125 | goto Ebusy; |
1126 | if (a->acdirmax != b->acdirmax) |
1127 | goto Ebusy; |
1128 | if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) |
1129 | goto Ebusy; |
1130 | return 1; |
1131 | Ebusy: |
1132 | return 0; |
1133 | } |
1134 | |
1135 | static int nfs_set_super(struct super_block *s, struct fs_context *fc) |
1136 | { |
1137 | struct nfs_server *server = fc->s_fs_info; |
1138 | int ret; |
1139 | |
1140 | s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; |
1141 | ret = set_anon_super(s, data: server); |
1142 | if (ret == 0) |
1143 | server->s_dev = s->s_dev; |
1144 | return ret; |
1145 | } |
1146 | |
1147 | static int nfs_compare_super_address(struct nfs_server *server1, |
1148 | struct nfs_server *server2) |
1149 | { |
1150 | struct sockaddr *sap1, *sap2; |
1151 | struct rpc_xprt *xprt1 = server1->client->cl_xprt; |
1152 | struct rpc_xprt *xprt2 = server2->client->cl_xprt; |
1153 | |
1154 | if (!net_eq(net1: xprt1->xprt_net, net2: xprt2->xprt_net)) |
1155 | return 0; |
1156 | |
1157 | sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; |
1158 | sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; |
1159 | |
1160 | if (sap1->sa_family != sap2->sa_family) |
1161 | return 0; |
1162 | |
1163 | switch (sap1->sa_family) { |
1164 | case AF_INET: { |
1165 | struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; |
1166 | struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; |
1167 | if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) |
1168 | return 0; |
1169 | if (sin1->sin_port != sin2->sin_port) |
1170 | return 0; |
1171 | break; |
1172 | } |
1173 | case AF_INET6: { |
1174 | struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; |
1175 | struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; |
1176 | if (!ipv6_addr_equal(a1: &sin1->sin6_addr, a2: &sin2->sin6_addr)) |
1177 | return 0; |
1178 | if (sin1->sin6_port != sin2->sin6_port) |
1179 | return 0; |
1180 | break; |
1181 | } |
1182 | default: |
1183 | return 0; |
1184 | } |
1185 | |
1186 | return 1; |
1187 | } |
1188 | |
1189 | static int nfs_compare_userns(const struct nfs_server *old, |
1190 | const struct nfs_server *new) |
1191 | { |
1192 | const struct user_namespace *oldns = &init_user_ns; |
1193 | const struct user_namespace *newns = &init_user_ns; |
1194 | |
1195 | if (old->client && old->client->cl_cred) |
1196 | oldns = old->client->cl_cred->user_ns; |
1197 | if (new->client && new->client->cl_cred) |
1198 | newns = new->client->cl_cred->user_ns; |
1199 | if (oldns != newns) |
1200 | return 0; |
1201 | return 1; |
1202 | } |
1203 | |
1204 | static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) |
1205 | { |
1206 | struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(s: sb); |
1207 | |
1208 | if (!nfs_compare_super_address(server1: old, server2: server)) |
1209 | return 0; |
1210 | /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ |
1211 | if (old->flags & NFS_MOUNT_UNSHARED) |
1212 | return 0; |
1213 | if (memcmp(p: &old->fsid, q: &server->fsid, size: sizeof(old->fsid)) != 0) |
1214 | return 0; |
1215 | if (!nfs_compare_userns(old, new: server)) |
1216 | return 0; |
1217 | if ((old->has_sec_mnt_opts || fc->security) && |
1218 | security_sb_mnt_opts_compat(sb, mnt_opts: fc->security)) |
1219 | return 0; |
1220 | return nfs_compare_mount_options(s: sb, b: server, fc); |
1221 | } |
1222 | |
1223 | #ifdef CONFIG_NFS_FSCACHE |
1224 | static int nfs_get_cache_cookie(struct super_block *sb, |
1225 | struct nfs_fs_context *ctx) |
1226 | { |
1227 | struct nfs_server *nfss = NFS_SB(s: sb); |
1228 | char *uniq = NULL; |
1229 | int ulen = 0; |
1230 | |
1231 | nfss->fscache = NULL; |
1232 | |
1233 | if (!ctx) |
1234 | return 0; |
1235 | |
1236 | if (ctx->clone_data.sb) { |
1237 | struct nfs_server *mnt_s = NFS_SB(s: ctx->clone_data.sb); |
1238 | if (!(mnt_s->options & NFS_OPTION_FSCACHE)) |
1239 | return 0; |
1240 | if (mnt_s->fscache_uniq) { |
1241 | uniq = mnt_s->fscache_uniq; |
1242 | ulen = strlen(uniq); |
1243 | } |
1244 | } else { |
1245 | if (!(ctx->options & NFS_OPTION_FSCACHE)) |
1246 | return 0; |
1247 | if (ctx->fscache_uniq) { |
1248 | uniq = ctx->fscache_uniq; |
1249 | ulen = strlen(ctx->fscache_uniq); |
1250 | } |
1251 | } |
1252 | |
1253 | return nfs_fscache_get_super_cookie(sb, uniq, ulen); |
1254 | } |
1255 | #else |
1256 | static int nfs_get_cache_cookie(struct super_block *sb, |
1257 | struct nfs_fs_context *ctx) |
1258 | { |
1259 | return 0; |
1260 | } |
1261 | #endif |
1262 | |
1263 | int nfs_get_tree_common(struct fs_context *fc) |
1264 | { |
1265 | struct nfs_fs_context *ctx = nfs_fc2context(fc); |
1266 | struct super_block *s; |
1267 | int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; |
1268 | struct nfs_server *server = ctx->server; |
1269 | int error; |
1270 | |
1271 | ctx->server = NULL; |
1272 | if (IS_ERR(ptr: server)) |
1273 | return PTR_ERR(ptr: server); |
1274 | |
1275 | if (server->flags & NFS_MOUNT_UNSHARED) |
1276 | compare_super = NULL; |
1277 | |
1278 | /* -o noac implies -o sync */ |
1279 | if (server->flags & NFS_MOUNT_NOAC) |
1280 | fc->sb_flags |= SB_SYNCHRONOUS; |
1281 | |
1282 | if (ctx->clone_data.sb) |
1283 | if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) |
1284 | fc->sb_flags |= SB_SYNCHRONOUS; |
1285 | |
1286 | /* Get a superblock - note that we may end up sharing one that already exists */ |
1287 | fc->s_fs_info = server; |
1288 | s = sget_fc(fc, test: compare_super, set: nfs_set_super); |
1289 | fc->s_fs_info = NULL; |
1290 | if (IS_ERR(ptr: s)) { |
1291 | error = PTR_ERR(ptr: s); |
1292 | nfs_errorf(fc, "NFS: Couldn't get superblock" ); |
1293 | goto out_err_nosb; |
1294 | } |
1295 | |
1296 | if (s->s_fs_info != server) { |
1297 | nfs_free_server(server); |
1298 | server = NULL; |
1299 | } else { |
1300 | error = super_setup_bdi_name(sb: s, fmt: "%u:%u" , MAJOR(server->s_dev), |
1301 | MINOR(server->s_dev)); |
1302 | if (error) |
1303 | goto error_splat_super; |
1304 | s->s_bdi->io_pages = server->rpages; |
1305 | server->super = s; |
1306 | } |
1307 | |
1308 | if (!s->s_root) { |
1309 | unsigned bsize = ctx->clone_data.inherited_bsize; |
1310 | /* initial superblock/root creation */ |
1311 | nfs_fill_super(sb: s, ctx); |
1312 | if (bsize) { |
1313 | s->s_blocksize_bits = bsize; |
1314 | s->s_blocksize = 1U << bsize; |
1315 | } |
1316 | error = nfs_get_cache_cookie(sb: s, ctx); |
1317 | if (error < 0) |
1318 | goto error_splat_super; |
1319 | } |
1320 | |
1321 | error = nfs_get_root(s, fc); |
1322 | if (error < 0) { |
1323 | nfs_errorf(fc, "NFS: Couldn't get root dentry" ); |
1324 | goto error_splat_super; |
1325 | } |
1326 | |
1327 | s->s_flags |= SB_ACTIVE; |
1328 | error = 0; |
1329 | |
1330 | out: |
1331 | return error; |
1332 | |
1333 | out_err_nosb: |
1334 | nfs_free_server(server); |
1335 | goto out; |
1336 | error_splat_super: |
1337 | deactivate_locked_super(sb: s); |
1338 | goto out; |
1339 | } |
1340 | |
1341 | /* |
1342 | * Destroy an NFS superblock |
1343 | */ |
1344 | void nfs_kill_super(struct super_block *s) |
1345 | { |
1346 | struct nfs_server *server = NFS_SB(s); |
1347 | |
1348 | nfs_sysfs_move_sb_to_server(s: server); |
1349 | kill_anon_super(sb: s); |
1350 | |
1351 | nfs_fscache_release_super_cookie(s); |
1352 | |
1353 | nfs_free_server(server); |
1354 | } |
1355 | EXPORT_SYMBOL_GPL(nfs_kill_super); |
1356 | |
1357 | #if IS_ENABLED(CONFIG_NFS_V4) |
1358 | |
1359 | /* |
1360 | * NFS v4 module parameters need to stay in the |
1361 | * NFS client for backwards compatibility |
1362 | */ |
1363 | unsigned int nfs_callback_set_tcpport; |
1364 | unsigned short nfs_callback_nr_threads; |
1365 | /* Default cache timeout is 10 minutes */ |
1366 | unsigned int nfs_idmap_cache_timeout = 600; |
1367 | /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ |
1368 | bool nfs4_disable_idmapping = true; |
1369 | unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; |
1370 | unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; |
1371 | unsigned short send_implementation_id = 1; |
1372 | char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "" ; |
1373 | bool recover_lost_locks = false; |
1374 | short nfs_delay_retrans = -1; |
1375 | |
1376 | EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); |
1377 | EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); |
1378 | EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); |
1379 | EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); |
1380 | EXPORT_SYMBOL_GPL(max_session_slots); |
1381 | EXPORT_SYMBOL_GPL(max_session_cb_slots); |
1382 | EXPORT_SYMBOL_GPL(send_implementation_id); |
1383 | EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); |
1384 | EXPORT_SYMBOL_GPL(recover_lost_locks); |
1385 | EXPORT_SYMBOL_GPL(nfs_delay_retrans); |
1386 | |
1387 | #define NFS_CALLBACK_MAXPORTNR (65535U) |
1388 | |
1389 | static int param_set_portnr(const char *val, const struct kernel_param *kp) |
1390 | { |
1391 | unsigned long num; |
1392 | int ret; |
1393 | |
1394 | if (!val) |
1395 | return -EINVAL; |
1396 | ret = kstrtoul(s: val, base: 0, res: &num); |
1397 | if (ret || num > NFS_CALLBACK_MAXPORTNR) |
1398 | return -EINVAL; |
1399 | *((unsigned int *)kp->arg) = num; |
1400 | return 0; |
1401 | } |
1402 | static const struct kernel_param_ops param_ops_portnr = { |
1403 | .set = param_set_portnr, |
1404 | .get = param_get_uint, |
1405 | }; |
1406 | #define param_check_portnr(name, p) __param_check(name, p, unsigned int) |
1407 | |
1408 | module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); |
1409 | module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); |
1410 | MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " |
1411 | "assigned to the NFSv4 callback channels." ); |
1412 | module_param(nfs_idmap_cache_timeout, int, 0644); |
1413 | module_param(nfs4_disable_idmapping, bool, 0644); |
1414 | module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, |
1415 | NFS4_CLIENT_ID_UNIQ_LEN, 0600); |
1416 | MODULE_PARM_DESC(nfs4_disable_idmapping, |
1417 | "Turn off NFSv4 idmapping when using 'sec=sys'" ); |
1418 | module_param(max_session_slots, ushort, 0644); |
1419 | MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " |
1420 | "requests the client will negotiate" ); |
1421 | module_param(max_session_cb_slots, ushort, 0644); |
1422 | MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " |
1423 | "callbacks the client will process for a given server" ); |
1424 | module_param(send_implementation_id, ushort, 0644); |
1425 | MODULE_PARM_DESC(send_implementation_id, |
1426 | "Send implementation ID with NFSv4.1 exchange_id" ); |
1427 | MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string" ); |
1428 | |
1429 | module_param(recover_lost_locks, bool, 0644); |
1430 | MODULE_PARM_DESC(recover_lost_locks, |
1431 | "If the server reports that a lock might be lost, " |
1432 | "try to recover it risking data corruption." ); |
1433 | |
1434 | module_param_named(delay_retrans, nfs_delay_retrans, short, 0644); |
1435 | MODULE_PARM_DESC(delay_retrans, |
1436 | "Unless negative, specifies the number of times the NFSv4 " |
1437 | "client retries a request before returning an EAGAIN error, " |
1438 | "after a reply of NFS4ERR_DELAY from the server." ); |
1439 | #endif /* CONFIG_NFS_V4 */ |
1440 | |