Commit | Line | Data |
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f7b422b1 DH |
1 | /* |
2 | * linux/fs/nfs/super.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs superblock handling functions | |
7 | * | |
8 | * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some | |
9 | * experimental NFS changes. Modularisation taken straight from SYS5 fs. | |
10 | * | |
11 | * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. | |
12 | * J.S.Peatfield@damtp.cam.ac.uk | |
13 | * | |
14 | * Split from inode.c by David Howells <dhowells@redhat.com> | |
15 | * | |
54ceac45 DH |
16 | * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a |
17 | * particular server are held in the same superblock | |
18 | * - NFS superblocks can have several effective roots to the dentry tree | |
19 | * - directory type roots are spliced into the tree when a path from one root reaches the root | |
20 | * of another (see nfs_lookup()) | |
f7b422b1 DH |
21 | */ |
22 | ||
f7b422b1 DH |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> | |
25 | ||
26 | #include <linux/time.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/stat.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/unistd.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
34 | #include <linux/sunrpc/stats.h> | |
35 | #include <linux/sunrpc/metrics.h> | |
0896a725 | 36 | #include <linux/sunrpc/xprtsock.h> |
2cf7ff7a | 37 | #include <linux/sunrpc/xprtrdma.h> |
f7b422b1 DH |
38 | #include <linux/nfs_fs.h> |
39 | #include <linux/nfs_mount.h> | |
40 | #include <linux/nfs4_mount.h> | |
41 | #include <linux/lockd/bind.h> | |
42 | #include <linux/smp_lock.h> | |
43 | #include <linux/seq_file.h> | |
44 | #include <linux/mount.h> | |
45 | #include <linux/nfs_idmap.h> | |
46 | #include <linux/vfs.h> | |
47 | #include <linux/inet.h> | |
fd00a8ff CL |
48 | #include <linux/in6.h> |
49 | #include <net/ipv6.h> | |
f7b422b1 | 50 | #include <linux/nfs_xdr.h> |
b5d5dfbd | 51 | #include <linux/magic.h> |
bf0fd768 | 52 | #include <linux/parser.h> |
f7b422b1 DH |
53 | |
54 | #include <asm/system.h> | |
55 | #include <asm/uaccess.h> | |
56 | ||
57 | #include "nfs4_fs.h" | |
58 | #include "callback.h" | |
59 | #include "delegation.h" | |
60 | #include "iostat.h" | |
61 | #include "internal.h" | |
62 | ||
63 | #define NFSDBG_FACILITY NFSDBG_VFS | |
64 | ||
bf0fd768 CL |
65 | enum { |
66 | /* Mount options that take no arguments */ | |
67 | Opt_soft, Opt_hard, | |
68 | Opt_intr, Opt_nointr, | |
69 | Opt_posix, Opt_noposix, | |
70 | Opt_cto, Opt_nocto, | |
71 | Opt_ac, Opt_noac, | |
72 | Opt_lock, Opt_nolock, | |
73 | Opt_v2, Opt_v3, | |
2cf7ff7a | 74 | Opt_udp, Opt_tcp, Opt_rdma, |
bf0fd768 CL |
75 | Opt_acl, Opt_noacl, |
76 | Opt_rdirplus, Opt_nordirplus, | |
75180df2 | 77 | Opt_sharecache, Opt_nosharecache, |
bf0fd768 CL |
78 | |
79 | /* Mount options that take integer arguments */ | |
80 | Opt_port, | |
81 | Opt_rsize, Opt_wsize, Opt_bsize, | |
82 | Opt_timeo, Opt_retrans, | |
83 | Opt_acregmin, Opt_acregmax, | |
84 | Opt_acdirmin, Opt_acdirmax, | |
85 | Opt_actimeo, | |
86 | Opt_namelen, | |
87 | Opt_mountport, | |
e887cbcf | 88 | Opt_mountvers, |
ad879cef | 89 | Opt_nfsvers, |
bf0fd768 CL |
90 | |
91 | /* Mount options that take string arguments */ | |
33832034 | 92 | Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost, |
0ac83779 | 93 | Opt_addr, Opt_mountaddr, Opt_clientaddr, |
bf0fd768 CL |
94 | |
95 | /* Mount options that are ignored */ | |
96 | Opt_userspace, Opt_deprecated, | |
97 | ||
98 | Opt_err | |
99 | }; | |
100 | ||
101 | static match_table_t nfs_mount_option_tokens = { | |
102 | { Opt_userspace, "bg" }, | |
103 | { Opt_userspace, "fg" }, | |
104 | { Opt_soft, "soft" }, | |
105 | { Opt_hard, "hard" }, | |
106 | { Opt_intr, "intr" }, | |
107 | { Opt_nointr, "nointr" }, | |
108 | { Opt_posix, "posix" }, | |
109 | { Opt_noposix, "noposix" }, | |
110 | { Opt_cto, "cto" }, | |
111 | { Opt_nocto, "nocto" }, | |
112 | { Opt_ac, "ac" }, | |
113 | { Opt_noac, "noac" }, | |
114 | { Opt_lock, "lock" }, | |
115 | { Opt_nolock, "nolock" }, | |
116 | { Opt_v2, "v2" }, | |
117 | { Opt_v3, "v3" }, | |
118 | { Opt_udp, "udp" }, | |
119 | { Opt_tcp, "tcp" }, | |
2cf7ff7a | 120 | { Opt_rdma, "rdma" }, |
bf0fd768 CL |
121 | { Opt_acl, "acl" }, |
122 | { Opt_noacl, "noacl" }, | |
123 | { Opt_rdirplus, "rdirplus" }, | |
124 | { Opt_nordirplus, "nordirplus" }, | |
75180df2 TM |
125 | { Opt_sharecache, "sharecache" }, |
126 | { Opt_nosharecache, "nosharecache" }, | |
bf0fd768 CL |
127 | |
128 | { Opt_port, "port=%u" }, | |
129 | { Opt_rsize, "rsize=%u" }, | |
130 | { Opt_wsize, "wsize=%u" }, | |
131 | { Opt_bsize, "bsize=%u" }, | |
132 | { Opt_timeo, "timeo=%u" }, | |
133 | { Opt_retrans, "retrans=%u" }, | |
134 | { Opt_acregmin, "acregmin=%u" }, | |
135 | { Opt_acregmax, "acregmax=%u" }, | |
136 | { Opt_acdirmin, "acdirmin=%u" }, | |
137 | { Opt_acdirmax, "acdirmax=%u" }, | |
138 | { Opt_actimeo, "actimeo=%u" }, | |
139 | { Opt_userspace, "retry=%u" }, | |
140 | { Opt_namelen, "namlen=%u" }, | |
141 | { Opt_mountport, "mountport=%u" }, | |
bf0fd768 | 142 | { Opt_mountvers, "mountvers=%u" }, |
bf0fd768 CL |
143 | { Opt_nfsvers, "nfsvers=%u" }, |
144 | { Opt_nfsvers, "vers=%u" }, | |
145 | ||
146 | { Opt_sec, "sec=%s" }, | |
147 | { Opt_proto, "proto=%s" }, | |
148 | { Opt_mountproto, "mountproto=%s" }, | |
149 | { Opt_addr, "addr=%s" }, | |
150 | { Opt_clientaddr, "clientaddr=%s" }, | |
33832034 | 151 | { Opt_mounthost, "mounthost=%s" }, |
0ac83779 | 152 | { Opt_mountaddr, "mountaddr=%s" }, |
bf0fd768 CL |
153 | |
154 | { Opt_err, NULL } | |
155 | }; | |
156 | ||
157 | enum { | |
2cf7ff7a | 158 | Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma, |
bf0fd768 CL |
159 | |
160 | Opt_xprt_err | |
161 | }; | |
162 | ||
163 | static match_table_t nfs_xprt_protocol_tokens = { | |
164 | { Opt_xprt_udp, "udp" }, | |
165 | { Opt_xprt_tcp, "tcp" }, | |
2cf7ff7a | 166 | { Opt_xprt_rdma, "rdma" }, |
bf0fd768 CL |
167 | |
168 | { Opt_xprt_err, NULL } | |
169 | }; | |
170 | ||
171 | enum { | |
172 | Opt_sec_none, Opt_sec_sys, | |
173 | Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, | |
174 | Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp, | |
175 | Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp, | |
176 | ||
177 | Opt_sec_err | |
178 | }; | |
179 | ||
180 | static match_table_t nfs_secflavor_tokens = { | |
181 | { Opt_sec_none, "none" }, | |
182 | { Opt_sec_none, "null" }, | |
183 | { Opt_sec_sys, "sys" }, | |
184 | ||
185 | { Opt_sec_krb5, "krb5" }, | |
186 | { Opt_sec_krb5i, "krb5i" }, | |
187 | { Opt_sec_krb5p, "krb5p" }, | |
188 | ||
189 | { Opt_sec_lkey, "lkey" }, | |
190 | { Opt_sec_lkeyi, "lkeyi" }, | |
191 | { Opt_sec_lkeyp, "lkeyp" }, | |
192 | ||
193 | { Opt_sec_err, NULL } | |
194 | }; | |
195 | ||
196 | ||
f7b422b1 | 197 | static void nfs_umount_begin(struct vfsmount *, int); |
816724e6 | 198 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
f7b422b1 DH |
199 | static int nfs_show_options(struct seq_file *, struct vfsmount *); |
200 | static int nfs_show_stats(struct seq_file *, struct vfsmount *); | |
816724e6 | 201 | static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); |
54ceac45 | 202 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, |
816724e6 | 203 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); |
f7b422b1 | 204 | static void nfs_kill_super(struct super_block *); |
ef818a28 | 205 | static void nfs_put_super(struct super_block *); |
f7b422b1 DH |
206 | |
207 | static struct file_system_type nfs_fs_type = { | |
208 | .owner = THIS_MODULE, | |
209 | .name = "nfs", | |
210 | .get_sb = nfs_get_sb, | |
211 | .kill_sb = nfs_kill_super, | |
349457cc | 212 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
213 | }; |
214 | ||
54ceac45 | 215 | struct file_system_type nfs_xdev_fs_type = { |
f7b422b1 DH |
216 | .owner = THIS_MODULE, |
217 | .name = "nfs", | |
54ceac45 | 218 | .get_sb = nfs_xdev_get_sb, |
f7b422b1 | 219 | .kill_sb = nfs_kill_super, |
349457cc | 220 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
221 | }; |
222 | ||
ee9b6d61 | 223 | static const struct super_operations nfs_sops = { |
f7b422b1 DH |
224 | .alloc_inode = nfs_alloc_inode, |
225 | .destroy_inode = nfs_destroy_inode, | |
226 | .write_inode = nfs_write_inode, | |
ef818a28 | 227 | .put_super = nfs_put_super, |
f7b422b1 DH |
228 | .statfs = nfs_statfs, |
229 | .clear_inode = nfs_clear_inode, | |
230 | .umount_begin = nfs_umount_begin, | |
231 | .show_options = nfs_show_options, | |
232 | .show_stats = nfs_show_stats, | |
233 | }; | |
234 | ||
235 | #ifdef CONFIG_NFS_V4 | |
816724e6 TM |
236 | static int nfs4_get_sb(struct file_system_type *fs_type, |
237 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
54ceac45 DH |
238 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, |
239 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
240 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, | |
241 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
f7b422b1 DH |
242 | static void nfs4_kill_super(struct super_block *sb); |
243 | ||
244 | static struct file_system_type nfs4_fs_type = { | |
245 | .owner = THIS_MODULE, | |
246 | .name = "nfs4", | |
247 | .get_sb = nfs4_get_sb, | |
248 | .kill_sb = nfs4_kill_super, | |
349457cc | 249 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
250 | }; |
251 | ||
54ceac45 | 252 | struct file_system_type nfs4_xdev_fs_type = { |
f7b422b1 DH |
253 | .owner = THIS_MODULE, |
254 | .name = "nfs4", | |
54ceac45 | 255 | .get_sb = nfs4_xdev_get_sb, |
f7b422b1 | 256 | .kill_sb = nfs4_kill_super, |
349457cc | 257 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
258 | }; |
259 | ||
54ceac45 | 260 | struct file_system_type nfs4_referral_fs_type = { |
f7b422b1 DH |
261 | .owner = THIS_MODULE, |
262 | .name = "nfs4", | |
54ceac45 | 263 | .get_sb = nfs4_referral_get_sb, |
f7b422b1 | 264 | .kill_sb = nfs4_kill_super, |
349457cc | 265 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
266 | }; |
267 | ||
ee9b6d61 | 268 | static const struct super_operations nfs4_sops = { |
f7b422b1 DH |
269 | .alloc_inode = nfs_alloc_inode, |
270 | .destroy_inode = nfs_destroy_inode, | |
271 | .write_inode = nfs_write_inode, | |
272 | .statfs = nfs_statfs, | |
273 | .clear_inode = nfs4_clear_inode, | |
274 | .umount_begin = nfs_umount_begin, | |
275 | .show_options = nfs_show_options, | |
276 | .show_stats = nfs_show_stats, | |
277 | }; | |
278 | #endif | |
279 | ||
8e1f936b RR |
280 | static struct shrinker acl_shrinker = { |
281 | .shrink = nfs_access_cache_shrinker, | |
282 | .seeks = DEFAULT_SEEKS, | |
283 | }; | |
979df72e | 284 | |
f7b422b1 DH |
285 | /* |
286 | * Register the NFS filesystems | |
287 | */ | |
288 | int __init register_nfs_fs(void) | |
289 | { | |
290 | int ret; | |
291 | ||
292 | ret = register_filesystem(&nfs_fs_type); | |
293 | if (ret < 0) | |
294 | goto error_0; | |
295 | ||
f7b422b1 DH |
296 | ret = nfs_register_sysctl(); |
297 | if (ret < 0) | |
298 | goto error_1; | |
89a09141 | 299 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
300 | ret = register_filesystem(&nfs4_fs_type); |
301 | if (ret < 0) | |
302 | goto error_2; | |
303 | #endif | |
8e1f936b | 304 | register_shrinker(&acl_shrinker); |
f7b422b1 DH |
305 | return 0; |
306 | ||
307 | #ifdef CONFIG_NFS_V4 | |
308 | error_2: | |
309 | nfs_unregister_sysctl(); | |
89a09141 | 310 | #endif |
f7b422b1 DH |
311 | error_1: |
312 | unregister_filesystem(&nfs_fs_type); | |
f7b422b1 DH |
313 | error_0: |
314 | return ret; | |
315 | } | |
316 | ||
317 | /* | |
318 | * Unregister the NFS filesystems | |
319 | */ | |
320 | void __exit unregister_nfs_fs(void) | |
321 | { | |
8e1f936b | 322 | unregister_shrinker(&acl_shrinker); |
f7b422b1 DH |
323 | #ifdef CONFIG_NFS_V4 |
324 | unregister_filesystem(&nfs4_fs_type); | |
f7b422b1 | 325 | #endif |
49af7ee1 | 326 | nfs_unregister_sysctl(); |
f7b422b1 DH |
327 | unregister_filesystem(&nfs_fs_type); |
328 | } | |
329 | ||
ef818a28 SD |
330 | void nfs_sb_active(struct nfs_server *server) |
331 | { | |
332 | atomic_inc(&server->active); | |
333 | } | |
334 | ||
335 | void nfs_sb_deactive(struct nfs_server *server) | |
336 | { | |
337 | if (atomic_dec_and_test(&server->active)) | |
338 | wake_up(&server->active_wq); | |
339 | } | |
340 | ||
341 | static void nfs_put_super(struct super_block *sb) | |
342 | { | |
343 | struct nfs_server *server = NFS_SB(sb); | |
344 | /* | |
345 | * Make sure there are no outstanding ops to this server. | |
346 | * If so, wait for them to finish before allowing the | |
347 | * unmount to continue. | |
348 | */ | |
349 | wait_event(server->active_wq, atomic_read(&server->active) == 0); | |
350 | } | |
351 | ||
f7b422b1 DH |
352 | /* |
353 | * Deliver file system statistics to userspace | |
354 | */ | |
816724e6 | 355 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 356 | { |
0c7d90cf | 357 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
f7b422b1 DH |
358 | unsigned char blockbits; |
359 | unsigned long blockres; | |
0c7d90cf | 360 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); |
f7b422b1 DH |
361 | struct nfs_fattr fattr; |
362 | struct nfs_fsstat res = { | |
363 | .fattr = &fattr, | |
364 | }; | |
365 | int error; | |
366 | ||
367 | lock_kernel(); | |
368 | ||
8fa5c000 | 369 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
f7b422b1 DH |
370 | if (error < 0) |
371 | goto out_err; | |
1a0ba9ae | 372 | buf->f_type = NFS_SUPER_MAGIC; |
f7b422b1 DH |
373 | |
374 | /* | |
375 | * Current versions of glibc do not correctly handle the | |
376 | * case where f_frsize != f_bsize. Eventually we want to | |
377 | * report the value of wtmult in this field. | |
378 | */ | |
0c7d90cf | 379 | buf->f_frsize = dentry->d_sb->s_blocksize; |
f7b422b1 DH |
380 | |
381 | /* | |
382 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
383 | * are reported in units of f_frsize. Linux hasn't had | |
384 | * an f_frsize field in its statfs struct until recently, | |
385 | * thus historically Linux's sys_statfs reports these | |
386 | * fields in units of f_bsize. | |
387 | */ | |
0c7d90cf DH |
388 | buf->f_bsize = dentry->d_sb->s_blocksize; |
389 | blockbits = dentry->d_sb->s_blocksize_bits; | |
f7b422b1 DH |
390 | blockres = (1 << blockbits) - 1; |
391 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
392 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
393 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
394 | ||
395 | buf->f_files = res.tfiles; | |
396 | buf->f_ffree = res.afiles; | |
397 | ||
398 | buf->f_namelen = server->namelen; | |
1a0ba9ae | 399 | |
f7b422b1 DH |
400 | unlock_kernel(); |
401 | return 0; | |
402 | ||
403 | out_err: | |
404 | dprintk("%s: statfs error = %d\n", __FUNCTION__, -error); | |
1a0ba9ae AA |
405 | unlock_kernel(); |
406 | return error; | |
f7b422b1 DH |
407 | } |
408 | ||
7d4e2747 DH |
409 | /* |
410 | * Map the security flavour number to a name | |
411 | */ | |
81039f1f TM |
412 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
413 | { | |
7d4e2747 | 414 | static const struct { |
81039f1f TM |
415 | rpc_authflavor_t flavour; |
416 | const char *str; | |
417 | } sec_flavours[] = { | |
418 | { RPC_AUTH_NULL, "null" }, | |
419 | { RPC_AUTH_UNIX, "sys" }, | |
420 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
421 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
422 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
423 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
424 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
425 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
426 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
427 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
428 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
4d81cd16 | 429 | { UINT_MAX, "unknown" } |
81039f1f TM |
430 | }; |
431 | int i; | |
432 | ||
4d81cd16 | 433 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
81039f1f TM |
434 | if (sec_flavours[i].flavour == flavour) |
435 | break; | |
436 | } | |
437 | return sec_flavours[i].str; | |
438 | } | |
439 | ||
f7b422b1 DH |
440 | /* |
441 | * Describe the mount options in force on this server representation | |
442 | */ | |
443 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) | |
444 | { | |
509de811 | 445 | static const struct proc_nfs_info { |
f7b422b1 | 446 | int flag; |
509de811 DH |
447 | const char *str; |
448 | const char *nostr; | |
f7b422b1 DH |
449 | } nfs_info[] = { |
450 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
bcf35617 | 451 | { NFS_MOUNT_INTR, ",intr", ",nointr" }, |
f7b422b1 DH |
452 | { NFS_MOUNT_NOCTO, ",nocto", "" }, |
453 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
454 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
455 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
74dd34e6 | 456 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
75180df2 | 457 | { NFS_MOUNT_UNSHARED, ",nosharecache", ""}, |
f7b422b1 DH |
458 | { 0, NULL, NULL } |
459 | }; | |
509de811 | 460 | const struct proc_nfs_info *nfs_infop; |
8fa5c000 | 461 | struct nfs_client *clp = nfss->nfs_client; |
f7b422b1 | 462 | |
8fa5c000 | 463 | seq_printf(m, ",vers=%d", clp->rpc_ops->version); |
f7b422b1 DH |
464 | seq_printf(m, ",rsize=%d", nfss->rsize); |
465 | seq_printf(m, ",wsize=%d", nfss->wsize); | |
466 | if (nfss->acregmin != 3*HZ || showdefaults) | |
467 | seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); | |
468 | if (nfss->acregmax != 60*HZ || showdefaults) | |
469 | seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); | |
470 | if (nfss->acdirmin != 30*HZ || showdefaults) | |
471 | seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); | |
472 | if (nfss->acdirmax != 60*HZ || showdefaults) | |
473 | seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); | |
474 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { | |
475 | if (nfss->flags & nfs_infop->flag) | |
476 | seq_puts(m, nfs_infop->str); | |
477 | else | |
478 | seq_puts(m, nfs_infop->nostr); | |
479 | } | |
56928edd TT |
480 | seq_printf(m, ",proto=%s", |
481 | rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO)); | |
5006a76c DH |
482 | seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ); |
483 | seq_printf(m, ",retrans=%u", clp->retrans_count); | |
81039f1f | 484 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
f7b422b1 DH |
485 | } |
486 | ||
487 | /* | |
488 | * Describe the mount options on this VFS mountpoint | |
489 | */ | |
490 | static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
491 | { | |
492 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
493 | ||
494 | nfs_show_mount_options(m, nfss, 0); | |
495 | ||
5d8515ca CL |
496 | seq_printf(m, ",addr=%s", |
497 | rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, | |
498 | RPC_DISPLAY_ADDR)); | |
f7b422b1 DH |
499 | |
500 | return 0; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Present statistical information for this VFS mountpoint | |
505 | */ | |
506 | static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) | |
507 | { | |
508 | int i, cpu; | |
509 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
510 | struct rpc_auth *auth = nfss->client->cl_auth; | |
511 | struct nfs_iostats totals = { }; | |
512 | ||
513 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
514 | ||
515 | /* | |
516 | * Display all mount option settings | |
517 | */ | |
518 | seq_printf(m, "\n\topts:\t"); | |
519 | seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); | |
520 | seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
521 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
522 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
523 | nfs_show_mount_options(m, nfss, 1); | |
524 | ||
525 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
526 | ||
527 | seq_printf(m, "\n\tcaps:\t"); | |
528 | seq_printf(m, "caps=0x%x", nfss->caps); | |
529 | seq_printf(m, ",wtmult=%d", nfss->wtmult); | |
530 | seq_printf(m, ",dtsize=%d", nfss->dtsize); | |
531 | seq_printf(m, ",bsize=%d", nfss->bsize); | |
532 | seq_printf(m, ",namelen=%d", nfss->namelen); | |
533 | ||
534 | #ifdef CONFIG_NFS_V4 | |
40c55319 | 535 | if (nfss->nfs_client->rpc_ops->version == 4) { |
f7b422b1 DH |
536 | seq_printf(m, "\n\tnfsv4:\t"); |
537 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
538 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
539 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
540 | } | |
541 | #endif | |
542 | ||
543 | /* | |
544 | * Display security flavor in effect for this mount | |
545 | */ | |
546 | seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor); | |
547 | if (auth->au_flavor) | |
548 | seq_printf(m, ",pseudoflavor=%d", auth->au_flavor); | |
549 | ||
550 | /* | |
551 | * Display superblock I/O counters | |
552 | */ | |
553 | for_each_possible_cpu(cpu) { | |
554 | struct nfs_iostats *stats; | |
555 | ||
556 | preempt_disable(); | |
557 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
558 | ||
559 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
560 | totals.events[i] += stats->events[i]; | |
561 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
562 | totals.bytes[i] += stats->bytes[i]; | |
563 | ||
564 | preempt_enable(); | |
565 | } | |
566 | ||
567 | seq_printf(m, "\n\tevents:\t"); | |
568 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
569 | seq_printf(m, "%lu ", totals.events[i]); | |
570 | seq_printf(m, "\n\tbytes:\t"); | |
571 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
572 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
573 | seq_printf(m, "\n"); | |
574 | ||
575 | rpc_print_iostats(m, nfss->client); | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | /* | |
581 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
54ceac45 | 582 | * in response to xdev traversals and referrals |
f7b422b1 DH |
583 | */ |
584 | static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags) | |
585 | { | |
fc6ae3cf TM |
586 | struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb); |
587 | struct rpc_clnt *rpc; | |
588 | ||
f7b422b1 | 589 | shrink_submounts(vfsmnt, &nfs_automount_list); |
fc6ae3cf TM |
590 | |
591 | if (!(flags & MNT_FORCE)) | |
592 | return; | |
593 | /* -EIO all pending I/O */ | |
594 | rpc = server->client_acl; | |
595 | if (!IS_ERR(rpc)) | |
596 | rpc_killall_tasks(rpc); | |
597 | rpc = server->client; | |
598 | if (!IS_ERR(rpc)) | |
599 | rpc_killall_tasks(rpc); | |
f7b422b1 DH |
600 | } |
601 | ||
04dcd6e3 CL |
602 | /* |
603 | * Set the port number in an address. Be agnostic about the address family. | |
604 | */ | |
605 | static void nfs_set_port(struct sockaddr *sap, unsigned short port) | |
606 | { | |
607 | switch (sap->sa_family) { | |
608 | case AF_INET: { | |
609 | struct sockaddr_in *ap = (struct sockaddr_in *)sap; | |
610 | ap->sin_port = htons(port); | |
611 | break; | |
612 | } | |
613 | case AF_INET6: { | |
614 | struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap; | |
615 | ap->sin6_port = htons(port); | |
616 | break; | |
617 | } | |
618 | } | |
619 | } | |
620 | ||
fc50d58f | 621 | /* |
cdcd7f9a CL |
622 | * Sanity-check a server address provided by the mount command. |
623 | * | |
624 | * Address family must be initialized, and address must not be | |
625 | * the ANY address for that family. | |
fc50d58f CL |
626 | */ |
627 | static int nfs_verify_server_address(struct sockaddr *addr) | |
628 | { | |
629 | switch (addr->sa_family) { | |
630 | case AF_INET: { | |
cdcd7f9a CL |
631 | struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
632 | return sa->sin_addr.s_addr != INADDR_ANY; | |
633 | } | |
634 | case AF_INET6: { | |
635 | struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; | |
636 | return !ipv6_addr_any(sa); | |
fc50d58f CL |
637 | } |
638 | } | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
9412b927 CL |
643 | /* |
644 | * Parse string addresses passed in via a mount option, | |
645 | * and construct a sockaddr based on the result. | |
646 | * | |
647 | * If address parsing fails, set the sockaddr's address | |
648 | * family to AF_UNSPEC to force nfs_verify_server_address() | |
649 | * to punt the mount. | |
650 | */ | |
651 | static void nfs_parse_server_address(char *value, | |
652 | struct sockaddr *sap) | |
653 | { | |
654 | struct sockaddr_in *ap = (void *)sap; | |
655 | ||
656 | ap->sin_family = AF_INET; | |
657 | if (in4_pton(value, -1, (u8 *)&ap->sin_addr.s_addr, '\0', NULL)) | |
658 | return; | |
659 | ||
660 | sap->sa_family = AF_UNSPEC; | |
661 | } | |
662 | ||
bf0fd768 CL |
663 | /* |
664 | * Error-check and convert a string of mount options from user space into | |
665 | * a data structure | |
666 | */ | |
667 | static int nfs_parse_mount_options(char *raw, | |
668 | struct nfs_parsed_mount_data *mnt) | |
669 | { | |
670 | char *p, *string; | |
04dcd6e3 | 671 | unsigned short port = 0; |
bf0fd768 CL |
672 | |
673 | if (!raw) { | |
674 | dfprintk(MOUNT, "NFS: mount options string was NULL.\n"); | |
675 | return 1; | |
676 | } | |
677 | dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw); | |
678 | ||
679 | while ((p = strsep(&raw, ",")) != NULL) { | |
680 | substring_t args[MAX_OPT_ARGS]; | |
681 | int option, token; | |
682 | ||
683 | if (!*p) | |
684 | continue; | |
685 | ||
686 | dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); | |
687 | ||
688 | token = match_token(p, nfs_mount_option_tokens, args); | |
689 | switch (token) { | |
690 | case Opt_soft: | |
691 | mnt->flags |= NFS_MOUNT_SOFT; | |
692 | break; | |
693 | case Opt_hard: | |
694 | mnt->flags &= ~NFS_MOUNT_SOFT; | |
695 | break; | |
696 | case Opt_intr: | |
697 | mnt->flags |= NFS_MOUNT_INTR; | |
698 | break; | |
699 | case Opt_nointr: | |
700 | mnt->flags &= ~NFS_MOUNT_INTR; | |
701 | break; | |
702 | case Opt_posix: | |
703 | mnt->flags |= NFS_MOUNT_POSIX; | |
704 | break; | |
705 | case Opt_noposix: | |
706 | mnt->flags &= ~NFS_MOUNT_POSIX; | |
707 | break; | |
708 | case Opt_cto: | |
709 | mnt->flags &= ~NFS_MOUNT_NOCTO; | |
710 | break; | |
711 | case Opt_nocto: | |
712 | mnt->flags |= NFS_MOUNT_NOCTO; | |
713 | break; | |
714 | case Opt_ac: | |
715 | mnt->flags &= ~NFS_MOUNT_NOAC; | |
716 | break; | |
717 | case Opt_noac: | |
718 | mnt->flags |= NFS_MOUNT_NOAC; | |
719 | break; | |
720 | case Opt_lock: | |
721 | mnt->flags &= ~NFS_MOUNT_NONLM; | |
722 | break; | |
723 | case Opt_nolock: | |
724 | mnt->flags |= NFS_MOUNT_NONLM; | |
725 | break; | |
726 | case Opt_v2: | |
727 | mnt->flags &= ~NFS_MOUNT_VER3; | |
728 | break; | |
729 | case Opt_v3: | |
730 | mnt->flags |= NFS_MOUNT_VER3; | |
731 | break; | |
732 | case Opt_udp: | |
733 | mnt->flags &= ~NFS_MOUNT_TCP; | |
0896a725 | 734 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 CL |
735 | mnt->timeo = 7; |
736 | mnt->retrans = 5; | |
737 | break; | |
738 | case Opt_tcp: | |
739 | mnt->flags |= NFS_MOUNT_TCP; | |
0896a725 | 740 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 CL |
741 | mnt->timeo = 600; |
742 | mnt->retrans = 2; | |
743 | break; | |
2cf7ff7a TT |
744 | case Opt_rdma: |
745 | mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */ | |
746 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
747 | mnt->timeo = 600; | |
748 | mnt->retrans = 2; | |
749 | break; | |
bf0fd768 CL |
750 | case Opt_acl: |
751 | mnt->flags &= ~NFS_MOUNT_NOACL; | |
752 | break; | |
753 | case Opt_noacl: | |
754 | mnt->flags |= NFS_MOUNT_NOACL; | |
755 | break; | |
756 | case Opt_rdirplus: | |
757 | mnt->flags &= ~NFS_MOUNT_NORDIRPLUS; | |
758 | break; | |
759 | case Opt_nordirplus: | |
760 | mnt->flags |= NFS_MOUNT_NORDIRPLUS; | |
761 | break; | |
75180df2 TM |
762 | case Opt_sharecache: |
763 | mnt->flags &= ~NFS_MOUNT_UNSHARED; | |
764 | break; | |
765 | case Opt_nosharecache: | |
766 | mnt->flags |= NFS_MOUNT_UNSHARED; | |
767 | break; | |
bf0fd768 CL |
768 | |
769 | case Opt_port: | |
770 | if (match_int(args, &option)) | |
771 | return 0; | |
772 | if (option < 0 || option > 65535) | |
773 | return 0; | |
04dcd6e3 | 774 | port = option; |
bf0fd768 CL |
775 | break; |
776 | case Opt_rsize: | |
777 | if (match_int(args, &mnt->rsize)) | |
778 | return 0; | |
779 | break; | |
780 | case Opt_wsize: | |
781 | if (match_int(args, &mnt->wsize)) | |
782 | return 0; | |
783 | break; | |
784 | case Opt_bsize: | |
785 | if (match_int(args, &option)) | |
786 | return 0; | |
787 | if (option < 0) | |
788 | return 0; | |
789 | mnt->bsize = option; | |
790 | break; | |
791 | case Opt_timeo: | |
792 | if (match_int(args, &mnt->timeo)) | |
793 | return 0; | |
794 | break; | |
795 | case Opt_retrans: | |
796 | if (match_int(args, &mnt->retrans)) | |
797 | return 0; | |
798 | break; | |
799 | case Opt_acregmin: | |
800 | if (match_int(args, &mnt->acregmin)) | |
801 | return 0; | |
802 | break; | |
803 | case Opt_acregmax: | |
804 | if (match_int(args, &mnt->acregmax)) | |
805 | return 0; | |
806 | break; | |
807 | case Opt_acdirmin: | |
808 | if (match_int(args, &mnt->acdirmin)) | |
809 | return 0; | |
810 | break; | |
811 | case Opt_acdirmax: | |
812 | if (match_int(args, &mnt->acdirmax)) | |
813 | return 0; | |
814 | break; | |
815 | case Opt_actimeo: | |
816 | if (match_int(args, &option)) | |
817 | return 0; | |
818 | if (option < 0) | |
819 | return 0; | |
820 | mnt->acregmin = | |
821 | mnt->acregmax = | |
822 | mnt->acdirmin = | |
823 | mnt->acdirmax = option; | |
824 | break; | |
825 | case Opt_namelen: | |
826 | if (match_int(args, &mnt->namlen)) | |
827 | return 0; | |
828 | break; | |
829 | case Opt_mountport: | |
830 | if (match_int(args, &option)) | |
831 | return 0; | |
832 | if (option < 0 || option > 65535) | |
833 | return 0; | |
834 | mnt->mount_server.port = option; | |
835 | break; | |
bf0fd768 CL |
836 | case Opt_mountvers: |
837 | if (match_int(args, &option)) | |
838 | return 0; | |
839 | if (option < 0) | |
840 | return 0; | |
841 | mnt->mount_server.version = option; | |
842 | break; | |
bf0fd768 CL |
843 | case Opt_nfsvers: |
844 | if (match_int(args, &option)) | |
845 | return 0; | |
846 | switch (option) { | |
847 | case 2: | |
848 | mnt->flags &= ~NFS_MOUNT_VER3; | |
849 | break; | |
850 | case 3: | |
851 | mnt->flags |= NFS_MOUNT_VER3; | |
852 | break; | |
853 | default: | |
854 | goto out_unrec_vers; | |
855 | } | |
856 | break; | |
857 | ||
858 | case Opt_sec: | |
859 | string = match_strdup(args); | |
860 | if (string == NULL) | |
861 | goto out_nomem; | |
862 | token = match_token(string, nfs_secflavor_tokens, args); | |
863 | kfree(string); | |
864 | ||
865 | /* | |
866 | * The flags setting is for v2/v3. The flavor_len | |
867 | * setting is for v4. v2/v3 also need to know the | |
868 | * difference between NULL and UNIX. | |
869 | */ | |
870 | switch (token) { | |
871 | case Opt_sec_none: | |
872 | mnt->flags &= ~NFS_MOUNT_SECFLAVOUR; | |
873 | mnt->auth_flavor_len = 0; | |
874 | mnt->auth_flavors[0] = RPC_AUTH_NULL; | |
875 | break; | |
876 | case Opt_sec_sys: | |
877 | mnt->flags &= ~NFS_MOUNT_SECFLAVOUR; | |
878 | mnt->auth_flavor_len = 0; | |
879 | mnt->auth_flavors[0] = RPC_AUTH_UNIX; | |
880 | break; | |
881 | case Opt_sec_krb5: | |
882 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
883 | mnt->auth_flavor_len = 1; | |
884 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5; | |
885 | break; | |
886 | case Opt_sec_krb5i: | |
887 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
888 | mnt->auth_flavor_len = 1; | |
889 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I; | |
890 | break; | |
891 | case Opt_sec_krb5p: | |
892 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
893 | mnt->auth_flavor_len = 1; | |
894 | mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P; | |
895 | break; | |
896 | case Opt_sec_lkey: | |
897 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
898 | mnt->auth_flavor_len = 1; | |
899 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY; | |
900 | break; | |
901 | case Opt_sec_lkeyi: | |
902 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
903 | mnt->auth_flavor_len = 1; | |
904 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI; | |
905 | break; | |
906 | case Opt_sec_lkeyp: | |
907 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
908 | mnt->auth_flavor_len = 1; | |
909 | mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP; | |
910 | break; | |
911 | case Opt_sec_spkm: | |
912 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
913 | mnt->auth_flavor_len = 1; | |
914 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM; | |
915 | break; | |
916 | case Opt_sec_spkmi: | |
917 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
918 | mnt->auth_flavor_len = 1; | |
919 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI; | |
920 | break; | |
921 | case Opt_sec_spkmp: | |
922 | mnt->flags |= NFS_MOUNT_SECFLAVOUR; | |
923 | mnt->auth_flavor_len = 1; | |
924 | mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP; | |
925 | break; | |
926 | default: | |
927 | goto out_unrec_sec; | |
928 | } | |
929 | break; | |
930 | case Opt_proto: | |
931 | string = match_strdup(args); | |
932 | if (string == NULL) | |
933 | goto out_nomem; | |
934 | token = match_token(string, | |
935 | nfs_xprt_protocol_tokens, args); | |
936 | kfree(string); | |
937 | ||
938 | switch (token) { | |
fdb66ff4 | 939 | case Opt_xprt_udp: |
bf0fd768 | 940 | mnt->flags &= ~NFS_MOUNT_TCP; |
0896a725 | 941 | mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 CL |
942 | mnt->timeo = 7; |
943 | mnt->retrans = 5; | |
944 | break; | |
fdb66ff4 | 945 | case Opt_xprt_tcp: |
bf0fd768 | 946 | mnt->flags |= NFS_MOUNT_TCP; |
0896a725 | 947 | mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 CL |
948 | mnt->timeo = 600; |
949 | mnt->retrans = 2; | |
950 | break; | |
2cf7ff7a TT |
951 | case Opt_xprt_rdma: |
952 | /* vector side protocols to TCP */ | |
953 | mnt->flags |= NFS_MOUNT_TCP; | |
954 | mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA; | |
955 | mnt->timeo = 600; | |
956 | mnt->retrans = 2; | |
957 | break; | |
bf0fd768 CL |
958 | default: |
959 | goto out_unrec_xprt; | |
960 | } | |
961 | break; | |
962 | case Opt_mountproto: | |
963 | string = match_strdup(args); | |
964 | if (string == NULL) | |
965 | goto out_nomem; | |
966 | token = match_token(string, | |
967 | nfs_xprt_protocol_tokens, args); | |
968 | kfree(string); | |
969 | ||
970 | switch (token) { | |
fdb66ff4 | 971 | case Opt_xprt_udp: |
0896a725 | 972 | mnt->mount_server.protocol = XPRT_TRANSPORT_UDP; |
bf0fd768 | 973 | break; |
fdb66ff4 | 974 | case Opt_xprt_tcp: |
0896a725 | 975 | mnt->mount_server.protocol = XPRT_TRANSPORT_TCP; |
bf0fd768 | 976 | break; |
2cf7ff7a | 977 | case Opt_xprt_rdma: /* not used for side protocols */ |
bf0fd768 CL |
978 | default: |
979 | goto out_unrec_xprt; | |
980 | } | |
981 | break; | |
982 | case Opt_addr: | |
983 | string = match_strdup(args); | |
984 | if (string == NULL) | |
985 | goto out_nomem; | |
9412b927 CL |
986 | nfs_parse_server_address(string, (struct sockaddr *) |
987 | &mnt->nfs_server.address); | |
bf0fd768 CL |
988 | kfree(string); |
989 | break; | |
990 | case Opt_clientaddr: | |
991 | string = match_strdup(args); | |
992 | if (string == NULL) | |
993 | goto out_nomem; | |
994 | mnt->client_address = string; | |
995 | break; | |
33832034 CL |
996 | case Opt_mounthost: |
997 | string = match_strdup(args); | |
998 | if (string == NULL) | |
999 | goto out_nomem; | |
1000 | mnt->mount_server.hostname = string; | |
1001 | break; | |
0ac83779 | 1002 | case Opt_mountaddr: |
bf0fd768 CL |
1003 | string = match_strdup(args); |
1004 | if (string == NULL) | |
1005 | goto out_nomem; | |
9412b927 CL |
1006 | nfs_parse_server_address(string, (struct sockaddr *) |
1007 | &mnt->mount_server.address); | |
bf0fd768 CL |
1008 | kfree(string); |
1009 | break; | |
1010 | ||
1011 | case Opt_userspace: | |
1012 | case Opt_deprecated: | |
1013 | break; | |
1014 | ||
1015 | default: | |
1016 | goto out_unknown; | |
1017 | } | |
1018 | } | |
1019 | ||
04dcd6e3 CL |
1020 | nfs_set_port((struct sockaddr *)&mnt->nfs_server.address, port); |
1021 | ||
bf0fd768 CL |
1022 | return 1; |
1023 | ||
1024 | out_nomem: | |
1025 | printk(KERN_INFO "NFS: not enough memory to parse option\n"); | |
1026 | return 0; | |
1027 | ||
1028 | out_unrec_vers: | |
1029 | printk(KERN_INFO "NFS: unrecognized NFS version number\n"); | |
1030 | return 0; | |
1031 | ||
1032 | out_unrec_xprt: | |
1033 | printk(KERN_INFO "NFS: unrecognized transport protocol\n"); | |
1034 | return 0; | |
1035 | ||
1036 | out_unrec_sec: | |
1037 | printk(KERN_INFO "NFS: unrecognized security flavor\n"); | |
1038 | return 0; | |
1039 | ||
1040 | out_unknown: | |
1041 | printk(KERN_INFO "NFS: unknown mount option: %s\n", p); | |
1042 | return 0; | |
1043 | } | |
1044 | ||
0076d7b7 CL |
1045 | /* |
1046 | * Use the remote server's MOUNT service to request the NFS file handle | |
1047 | * corresponding to the provided path. | |
1048 | */ | |
1049 | static int nfs_try_mount(struct nfs_parsed_mount_data *args, | |
1050 | struct nfs_fh *root_fh) | |
1051 | { | |
1052 | struct sockaddr_in sin; | |
1053 | int status; | |
33832034 | 1054 | char *hostname; |
0076d7b7 CL |
1055 | |
1056 | if (args->mount_server.version == 0) { | |
1057 | if (args->flags & NFS_MOUNT_VER3) | |
1058 | args->mount_server.version = NFS_MNT3_VERSION; | |
1059 | else | |
1060 | args->mount_server.version = NFS_MNT_VERSION; | |
1061 | } | |
1062 | ||
33832034 CL |
1063 | if (args->mount_server.hostname) |
1064 | hostname = args->mount_server.hostname; | |
1065 | else | |
1066 | hostname = args->nfs_server.hostname; | |
1067 | ||
0076d7b7 CL |
1068 | /* |
1069 | * Construct the mount server's address. | |
1070 | */ | |
1071 | if (args->mount_server.address.sin_addr.s_addr != INADDR_ANY) | |
1072 | sin = args->mount_server.address; | |
1073 | else | |
1074 | sin = args->nfs_server.address; | |
aad70007 JL |
1075 | /* |
1076 | * autobind will be used if mount_server.port == 0 | |
1077 | */ | |
04dcd6e3 | 1078 | nfs_set_port((struct sockaddr *)&sin, args->mount_server.port); |
0076d7b7 CL |
1079 | |
1080 | /* | |
1081 | * Now ask the mount server to map our export path | |
1082 | * to a file handle. | |
1083 | */ | |
1084 | status = nfs_mount((struct sockaddr *) &sin, | |
1085 | sizeof(sin), | |
33832034 | 1086 | hostname, |
0076d7b7 CL |
1087 | args->nfs_server.export_path, |
1088 | args->mount_server.version, | |
1089 | args->mount_server.protocol, | |
1090 | root_fh); | |
efd8340b CL |
1091 | if (status == 0) |
1092 | return 0; | |
0076d7b7 | 1093 | |
33832034 CL |
1094 | dfprintk(MOUNT, "NFS: unable to mount server %s, error %d", |
1095 | hostname, status); | |
0076d7b7 CL |
1096 | return status; |
1097 | } | |
1098 | ||
f7b422b1 | 1099 | /* |
54ceac45 DH |
1100 | * Validate the NFS2/NFS3 mount data |
1101 | * - fills in the mount root filehandle | |
136d558c CL |
1102 | * |
1103 | * For option strings, user space handles the following behaviors: | |
1104 | * | |
1105 | * + DNS: mapping server host name to IP address ("addr=" option) | |
1106 | * | |
1107 | * + failure mode: how to behave if a mount request can't be handled | |
1108 | * immediately ("fg/bg" option) | |
1109 | * | |
1110 | * + retry: how often to retry a mount request ("retry=" option) | |
1111 | * | |
1112 | * + breaking back: trying proto=udp after proto=tcp, v2 after v3, | |
1113 | * mountproto=tcp after mountproto=udp, and so on | |
f7b422b1 | 1114 | */ |
2283f8d6 TT |
1115 | static int nfs_validate_mount_data(void *options, |
1116 | struct nfs_parsed_mount_data *args, | |
136d558c CL |
1117 | struct nfs_fh *mntfh, |
1118 | const char *dev_name) | |
f7b422b1 | 1119 | { |
2283f8d6 | 1120 | struct nfs_mount_data *data = (struct nfs_mount_data *)options; |
136d558c | 1121 | |
f16c9603 RK |
1122 | memset(args, 0, sizeof(*args)); |
1123 | ||
5df36e78 CL |
1124 | if (data == NULL) |
1125 | goto out_no_data; | |
f7b422b1 | 1126 | |
2283f8d6 TT |
1127 | args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP); |
1128 | args->rsize = NFS_MAX_FILE_IO_SIZE; | |
1129 | args->wsize = NFS_MAX_FILE_IO_SIZE; | |
1130 | args->timeo = 600; | |
1131 | args->retrans = 2; | |
1132 | args->acregmin = 3; | |
1133 | args->acregmax = 60; | |
1134 | args->acdirmin = 30; | |
1135 | args->acdirmax = 60; | |
0896a725 | 1136 | args->mount_server.protocol = XPRT_TRANSPORT_UDP; |
0896a725 | 1137 | args->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
2283f8d6 | 1138 | |
54ceac45 | 1139 | switch (data->version) { |
5df36e78 CL |
1140 | case 1: |
1141 | data->namlen = 0; | |
1142 | case 2: | |
1143 | data->bsize = 0; | |
1144 | case 3: | |
1145 | if (data->flags & NFS_MOUNT_VER3) | |
1146 | goto out_no_v3; | |
1147 | data->root.size = NFS2_FHSIZE; | |
1148 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
1149 | case 4: | |
1150 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
1151 | goto out_no_sec; | |
1152 | case 5: | |
1153 | memset(data->context, 0, sizeof(data->context)); | |
1154 | case 6: | |
1155 | if (data->flags & NFS_MOUNT_VER3) | |
1156 | mntfh->size = data->root.size; | |
1157 | else | |
1158 | mntfh->size = NFS2_FHSIZE; | |
1159 | ||
1160 | if (mntfh->size > sizeof(mntfh->data)) | |
1161 | goto out_invalid_fh; | |
1162 | ||
1163 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
1164 | if (mntfh->size < sizeof(mntfh->data)) | |
1165 | memset(mntfh->data + mntfh->size, 0, | |
1166 | sizeof(mntfh->data) - mntfh->size); | |
6e88e061 CL |
1167 | |
1168 | if (!nfs_verify_server_address((struct sockaddr *) &data->addr)) | |
1169 | goto out_no_address; | |
1170 | ||
2283f8d6 TT |
1171 | /* |
1172 | * Translate to nfs_parsed_mount_data, which nfs_fill_super | |
1173 | * can deal with. | |
1174 | */ | |
1175 | args->flags = data->flags; | |
1176 | args->rsize = data->rsize; | |
1177 | args->wsize = data->wsize; | |
1178 | args->flags = data->flags; | |
1179 | args->timeo = data->timeo; | |
1180 | args->retrans = data->retrans; | |
1181 | args->acregmin = data->acregmin; | |
1182 | args->acregmax = data->acregmax; | |
1183 | args->acdirmin = data->acdirmin; | |
1184 | args->acdirmax = data->acdirmax; | |
1185 | args->nfs_server.address = data->addr; | |
1186 | if (!(data->flags & NFS_MOUNT_TCP)) | |
0896a725 | 1187 | args->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
2283f8d6 TT |
1188 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1189 | args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); | |
1190 | args->namlen = data->namlen; | |
1191 | args->bsize = data->bsize; | |
1192 | args->auth_flavors[0] = data->pseudoflavor; | |
5df36e78 | 1193 | break; |
136d558c CL |
1194 | default: { |
1195 | unsigned int len; | |
1196 | char *c; | |
1197 | int status; | |
136d558c | 1198 | |
2283f8d6 TT |
1199 | if (nfs_parse_mount_options((char *)options, args) == 0) |
1200 | return -EINVAL; | |
136d558c | 1201 | |
6e88e061 CL |
1202 | if (!nfs_verify_server_address((struct sockaddr *) |
1203 | &args->nfs_server.address)) | |
1204 | goto out_no_address; | |
1205 | ||
136d558c CL |
1206 | c = strchr(dev_name, ':'); |
1207 | if (c == NULL) | |
1208 | return -EINVAL; | |
350c73af | 1209 | len = c - dev_name; |
2283f8d6 TT |
1210 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1211 | args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL); | |
136d558c CL |
1212 | |
1213 | c++; | |
1214 | if (strlen(c) > NFS_MAXPATHLEN) | |
7d1cca72 | 1215 | return -ENAMETOOLONG; |
2283f8d6 | 1216 | args->nfs_server.export_path = c; |
136d558c | 1217 | |
2283f8d6 | 1218 | status = nfs_try_mount(args, mntfh); |
136d558c | 1219 | if (status) |
fdc6e2c8 | 1220 | return status; |
136d558c | 1221 | |
136d558c CL |
1222 | break; |
1223 | } | |
f7b422b1 | 1224 | } |
54ceac45 | 1225 | |
2283f8d6 TT |
1226 | if (!(args->flags & NFS_MOUNT_SECFLAVOUR)) |
1227 | args->auth_flavors[0] = RPC_AUTH_UNIX; | |
36b15c54 | 1228 | |
54ceac45 | 1229 | #ifndef CONFIG_NFS_V3 |
2283f8d6 | 1230 | if (args->flags & NFS_MOUNT_VER3) |
5df36e78 CL |
1231 | goto out_v3_not_compiled; |
1232 | #endif /* !CONFIG_NFS_V3 */ | |
f7b422b1 | 1233 | |
5df36e78 | 1234 | return 0; |
f7b422b1 | 1235 | |
5df36e78 CL |
1236 | out_no_data: |
1237 | dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); | |
1238 | return -EINVAL; | |
54ceac45 | 1239 | |
5df36e78 CL |
1240 | out_no_v3: |
1241 | dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", | |
1242 | data->version); | |
1243 | return -EINVAL; | |
f7b422b1 | 1244 | |
5df36e78 CL |
1245 | out_no_sec: |
1246 | dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); | |
1247 | return -EINVAL; | |
1248 | ||
5df36e78 CL |
1249 | #ifndef CONFIG_NFS_V3 |
1250 | out_v3_not_compiled: | |
1251 | dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); | |
1252 | return -EPROTONOSUPPORT; | |
1253 | #endif /* !CONFIG_NFS_V3 */ | |
1254 | ||
1255 | out_no_address: | |
1256 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
1257 | return -EINVAL; | |
1258 | ||
1259 | out_invalid_fh: | |
1260 | dfprintk(MOUNT, "NFS: invalid root filehandle\n"); | |
1261 | return -EINVAL; | |
f7b422b1 DH |
1262 | } |
1263 | ||
f7b422b1 | 1264 | /* |
54ceac45 | 1265 | * Initialise the common bits of the superblock |
f7b422b1 | 1266 | */ |
54ceac45 | 1267 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 1268 | { |
54ceac45 | 1269 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 1270 | |
54ceac45 | 1271 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 1272 | |
54ceac45 DH |
1273 | /* We probably want something more informative here */ |
1274 | snprintf(sb->s_id, sizeof(sb->s_id), | |
1275 | "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
5006a76c | 1276 | |
54ceac45 DH |
1277 | if (sb->s_blocksize == 0) |
1278 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
1279 | &sb->s_blocksize_bits); | |
f7b422b1 | 1280 | |
54ceac45 DH |
1281 | if (server->flags & NFS_MOUNT_NOAC) |
1282 | sb->s_flags |= MS_SYNCHRONOUS; | |
f7b422b1 | 1283 | |
54ceac45 | 1284 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
1285 | } |
1286 | ||
1287 | /* | |
54ceac45 | 1288 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 1289 | */ |
2283f8d6 TT |
1290 | static void nfs_fill_super(struct super_block *sb, |
1291 | struct nfs_parsed_mount_data *data) | |
f7b422b1 DH |
1292 | { |
1293 | struct nfs_server *server = NFS_SB(sb); | |
5006a76c | 1294 | |
54ceac45 DH |
1295 | sb->s_blocksize_bits = 0; |
1296 | sb->s_blocksize = 0; | |
1297 | if (data->bsize) | |
1298 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 1299 | |
54ceac45 DH |
1300 | if (server->flags & NFS_MOUNT_VER3) { |
1301 | /* The VFS shouldn't apply the umask to mode bits. We will do | |
1302 | * so ourselves when necessary. | |
1303 | */ | |
1304 | sb->s_flags |= MS_POSIXACL; | |
1305 | sb->s_time_gran = 1; | |
816724e6 | 1306 | } |
54ceac45 DH |
1307 | |
1308 | sb->s_op = &nfs_sops; | |
1309 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
1310 | } |
1311 | ||
1312 | /* | |
54ceac45 | 1313 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 1314 | */ |
54ceac45 DH |
1315 | static void nfs_clone_super(struct super_block *sb, |
1316 | const struct super_block *old_sb) | |
f7b422b1 | 1317 | { |
54ceac45 DH |
1318 | struct nfs_server *server = NFS_SB(sb); |
1319 | ||
1320 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
1321 | sb->s_blocksize = old_sb->s_blocksize; | |
1322 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 1323 | |
f7b422b1 | 1324 | if (server->flags & NFS_MOUNT_VER3) { |
54ceac45 DH |
1325 | /* The VFS shouldn't apply the umask to mode bits. We will do |
1326 | * so ourselves when necessary. | |
f7b422b1 DH |
1327 | */ |
1328 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 1329 | sb->s_time_gran = 1; |
f7b422b1 DH |
1330 | } |
1331 | ||
54ceac45 DH |
1332 | sb->s_op = old_sb->s_op; |
1333 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
1334 | } |
1335 | ||
275a5d24 TM |
1336 | #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) |
1337 | ||
1338 | static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags) | |
1339 | { | |
1340 | const struct nfs_server *a = s->s_fs_info; | |
1341 | const struct rpc_clnt *clnt_a = a->client; | |
1342 | const struct rpc_clnt *clnt_b = b->client; | |
1343 | ||
1344 | if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK)) | |
1345 | goto Ebusy; | |
1346 | if (a->nfs_client != b->nfs_client) | |
1347 | goto Ebusy; | |
1348 | if (a->flags != b->flags) | |
1349 | goto Ebusy; | |
1350 | if (a->wsize != b->wsize) | |
1351 | goto Ebusy; | |
1352 | if (a->rsize != b->rsize) | |
1353 | goto Ebusy; | |
1354 | if (a->acregmin != b->acregmin) | |
1355 | goto Ebusy; | |
1356 | if (a->acregmax != b->acregmax) | |
1357 | goto Ebusy; | |
1358 | if (a->acdirmin != b->acdirmin) | |
1359 | goto Ebusy; | |
1360 | if (a->acdirmax != b->acdirmax) | |
1361 | goto Ebusy; | |
1362 | if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) | |
1363 | goto Ebusy; | |
e89a5a43 | 1364 | return 1; |
275a5d24 | 1365 | Ebusy: |
e89a5a43 TM |
1366 | return 0; |
1367 | } | |
1368 | ||
1369 | struct nfs_sb_mountdata { | |
1370 | struct nfs_server *server; | |
1371 | int mntflags; | |
1372 | }; | |
1373 | ||
1374 | static int nfs_set_super(struct super_block *s, void *data) | |
1375 | { | |
1376 | struct nfs_sb_mountdata *sb_mntdata = data; | |
1377 | struct nfs_server *server = sb_mntdata->server; | |
1378 | int ret; | |
1379 | ||
1380 | s->s_flags = sb_mntdata->mntflags; | |
1381 | s->s_fs_info = server; | |
1382 | ret = set_anon_super(s, server); | |
1383 | if (ret == 0) | |
1384 | server->s_dev = s->s_dev; | |
1385 | return ret; | |
1386 | } | |
1387 | ||
fd00a8ff CL |
1388 | static int nfs_compare_super_address(struct nfs_server *server1, |
1389 | struct nfs_server *server2) | |
1390 | { | |
1391 | struct sockaddr *sap1, *sap2; | |
1392 | ||
1393 | sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; | |
1394 | sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; | |
1395 | ||
1396 | if (sap1->sa_family != sap2->sa_family) | |
1397 | return 0; | |
1398 | ||
1399 | switch (sap1->sa_family) { | |
1400 | case AF_INET: { | |
1401 | struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; | |
1402 | struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; | |
1403 | if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) | |
1404 | return 0; | |
1405 | if (sin1->sin_port != sin2->sin_port) | |
1406 | return 0; | |
1407 | break; | |
1408 | } | |
1409 | case AF_INET6: { | |
1410 | struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; | |
1411 | struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; | |
1412 | if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) | |
1413 | return 0; | |
1414 | if (sin1->sin6_port != sin2->sin6_port) | |
1415 | return 0; | |
1416 | break; | |
1417 | } | |
1418 | default: | |
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | return 1; | |
1423 | } | |
1424 | ||
e89a5a43 TM |
1425 | static int nfs_compare_super(struct super_block *sb, void *data) |
1426 | { | |
1427 | struct nfs_sb_mountdata *sb_mntdata = data; | |
1428 | struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb); | |
1429 | int mntflags = sb_mntdata->mntflags; | |
1430 | ||
fd00a8ff | 1431 | if (!nfs_compare_super_address(old, server)) |
e89a5a43 TM |
1432 | return 0; |
1433 | /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ | |
1434 | if (old->flags & NFS_MOUNT_UNSHARED) | |
1435 | return 0; | |
1436 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) | |
1437 | return 0; | |
1438 | return nfs_compare_mount_options(sb, server, mntflags); | |
275a5d24 TM |
1439 | } |
1440 | ||
816724e6 TM |
1441 | static int nfs_get_sb(struct file_system_type *fs_type, |
1442 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 1443 | { |
f7b422b1 DH |
1444 | struct nfs_server *server = NULL; |
1445 | struct super_block *s; | |
54ceac45 | 1446 | struct nfs_fh mntfh; |
2283f8d6 | 1447 | struct nfs_parsed_mount_data data; |
54ceac45 | 1448 | struct dentry *mntroot; |
75180df2 | 1449 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
1450 | struct nfs_sb_mountdata sb_mntdata = { |
1451 | .mntflags = flags, | |
1452 | }; | |
54ceac45 | 1453 | int error; |
f7b422b1 | 1454 | |
54ceac45 | 1455 | /* Validate the mount data */ |
2283f8d6 | 1456 | error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name); |
54ceac45 | 1457 | if (error < 0) |
0655960f | 1458 | goto out; |
f7b422b1 | 1459 | |
54ceac45 | 1460 | /* Get a volume representation */ |
2283f8d6 | 1461 | server = nfs_create_server(&data, &mntfh); |
54ceac45 DH |
1462 | if (IS_ERR(server)) { |
1463 | error = PTR_ERR(server); | |
0655960f | 1464 | goto out; |
f7b422b1 | 1465 | } |
e89a5a43 | 1466 | sb_mntdata.server = server; |
f7b422b1 | 1467 | |
75180df2 TM |
1468 | if (server->flags & NFS_MOUNT_UNSHARED) |
1469 | compare_super = NULL; | |
1470 | ||
54ceac45 | 1471 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 1472 | s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 TM |
1473 | if (IS_ERR(s)) { |
1474 | error = PTR_ERR(s); | |
54ceac45 | 1475 | goto out_err_nosb; |
816724e6 TM |
1476 | } |
1477 | ||
54ceac45 DH |
1478 | if (s->s_fs_info != server) { |
1479 | nfs_free_server(server); | |
1480 | server = NULL; | |
1481 | } | |
f7b422b1 | 1482 | |
54ceac45 DH |
1483 | if (!s->s_root) { |
1484 | /* initial superblock/root creation */ | |
2283f8d6 | 1485 | nfs_fill_super(s, &data); |
54ceac45 | 1486 | } |
f7b422b1 | 1487 | |
54ceac45 DH |
1488 | mntroot = nfs_get_root(s, &mntfh); |
1489 | if (IS_ERR(mntroot)) { | |
1490 | error = PTR_ERR(mntroot); | |
1491 | goto error_splat_super; | |
f7b422b1 | 1492 | } |
816724e6 | 1493 | |
54ceac45 DH |
1494 | s->s_flags |= MS_ACTIVE; |
1495 | mnt->mnt_sb = s; | |
1496 | mnt->mnt_root = mntroot; | |
0655960f CL |
1497 | error = 0; |
1498 | ||
1499 | out: | |
2283f8d6 | 1500 | kfree(data.nfs_server.hostname); |
33832034 | 1501 | kfree(data.mount_server.hostname); |
0655960f | 1502 | return error; |
816724e6 | 1503 | |
54ceac45 DH |
1504 | out_err_nosb: |
1505 | nfs_free_server(server); | |
0655960f | 1506 | goto out; |
54ceac45 DH |
1507 | |
1508 | error_splat_super: | |
1509 | up_write(&s->s_umount); | |
1510 | deactivate_super(s); | |
0655960f | 1511 | goto out; |
f7b422b1 DH |
1512 | } |
1513 | ||
54ceac45 DH |
1514 | /* |
1515 | * Destroy an NFS2/3 superblock | |
1516 | */ | |
f7b422b1 DH |
1517 | static void nfs_kill_super(struct super_block *s) |
1518 | { | |
1519 | struct nfs_server *server = NFS_SB(s); | |
1520 | ||
1521 | kill_anon_super(s); | |
54ceac45 | 1522 | nfs_free_server(server); |
f7b422b1 DH |
1523 | } |
1524 | ||
54ceac45 DH |
1525 | /* |
1526 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
1527 | */ | |
1528 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, | |
1529 | const char *dev_name, void *raw_data, | |
1530 | struct vfsmount *mnt) | |
f7b422b1 DH |
1531 | { |
1532 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
1533 | struct super_block *s; |
1534 | struct nfs_server *server; | |
1535 | struct dentry *mntroot; | |
75180df2 | 1536 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
1537 | struct nfs_sb_mountdata sb_mntdata = { |
1538 | .mntflags = flags, | |
1539 | }; | |
54ceac45 | 1540 | int error; |
f7b422b1 | 1541 | |
54ceac45 | 1542 | dprintk("--> nfs_xdev_get_sb()\n"); |
f7b422b1 | 1543 | |
54ceac45 DH |
1544 | /* create a new volume representation */ |
1545 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
1546 | if (IS_ERR(server)) { | |
1547 | error = PTR_ERR(server); | |
1548 | goto out_err_noserver; | |
1549 | } | |
e89a5a43 | 1550 | sb_mntdata.server = server; |
8fa5c000 | 1551 | |
75180df2 TM |
1552 | if (server->flags & NFS_MOUNT_UNSHARED) |
1553 | compare_super = NULL; | |
1554 | ||
54ceac45 | 1555 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 1556 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
1557 | if (IS_ERR(s)) { |
1558 | error = PTR_ERR(s); | |
1559 | goto out_err_nosb; | |
1560 | } | |
5006a76c | 1561 | |
54ceac45 DH |
1562 | if (s->s_fs_info != server) { |
1563 | nfs_free_server(server); | |
1564 | server = NULL; | |
f7b422b1 | 1565 | } |
24c8dbbb | 1566 | |
54ceac45 DH |
1567 | if (!s->s_root) { |
1568 | /* initial superblock/root creation */ | |
54ceac45 DH |
1569 | nfs_clone_super(s, data->sb); |
1570 | } | |
f7b422b1 | 1571 | |
54ceac45 DH |
1572 | mntroot = nfs_get_root(s, data->fh); |
1573 | if (IS_ERR(mntroot)) { | |
1574 | error = PTR_ERR(mntroot); | |
1575 | goto error_splat_super; | |
f7b422b1 | 1576 | } |
e9cc6c23 | 1577 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
4c1fe2f7 NB |
1578 | dput(mntroot); |
1579 | error = -ESTALE; | |
1580 | goto error_splat_super; | |
1581 | } | |
f7b422b1 | 1582 | |
54ceac45 DH |
1583 | s->s_flags |= MS_ACTIVE; |
1584 | mnt->mnt_sb = s; | |
1585 | mnt->mnt_root = mntroot; | |
f7b422b1 | 1586 | |
54ceac45 DH |
1587 | dprintk("<-- nfs_xdev_get_sb() = 0\n"); |
1588 | return 0; | |
24c8dbbb | 1589 | |
54ceac45 DH |
1590 | out_err_nosb: |
1591 | nfs_free_server(server); | |
1592 | out_err_noserver: | |
1593 | dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); | |
1594 | return error; | |
f7b422b1 | 1595 | |
54ceac45 DH |
1596 | error_splat_super: |
1597 | up_write(&s->s_umount); | |
1598 | deactivate_super(s); | |
1599 | dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); | |
1600 | return error; | |
f7b422b1 DH |
1601 | } |
1602 | ||
54ceac45 DH |
1603 | #ifdef CONFIG_NFS_V4 |
1604 | ||
f7b422b1 | 1605 | /* |
54ceac45 | 1606 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 1607 | */ |
54ceac45 DH |
1608 | static void nfs4_clone_super(struct super_block *sb, |
1609 | const struct super_block *old_sb) | |
f7b422b1 | 1610 | { |
54ceac45 DH |
1611 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
1612 | sb->s_blocksize = old_sb->s_blocksize; | |
1613 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 1614 | sb->s_time_gran = 1; |
54ceac45 DH |
1615 | sb->s_op = old_sb->s_op; |
1616 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
1617 | } |
1618 | ||
54ceac45 DH |
1619 | /* |
1620 | * Set up an NFS4 superblock | |
1621 | */ | |
1622 | static void nfs4_fill_super(struct super_block *sb) | |
f7b422b1 | 1623 | { |
54ceac45 DH |
1624 | sb->s_time_gran = 1; |
1625 | sb->s_op = &nfs4_sops; | |
1626 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
1627 | } |
1628 | ||
0d0f0c19 CL |
1629 | /* |
1630 | * If the user didn't specify a port, set the port number to | |
1631 | * the NFS version 4 default port. | |
1632 | */ | |
1633 | static void nfs4_default_port(struct sockaddr *sap) | |
1634 | { | |
1635 | switch (sap->sa_family) { | |
1636 | case AF_INET: { | |
1637 | struct sockaddr_in *ap = (struct sockaddr_in *)sap; | |
1638 | if (ap->sin_port == 0) | |
1639 | ap->sin_port = htons(NFS_PORT); | |
1640 | break; | |
1641 | } | |
1642 | case AF_INET6: { | |
1643 | struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap; | |
1644 | if (ap->sin6_port == 0) | |
1645 | ap->sin6_port = htons(NFS_PORT); | |
1646 | break; | |
1647 | } | |
1648 | } | |
1649 | } | |
1650 | ||
f0768ebd CL |
1651 | /* |
1652 | * Validate NFSv4 mount options | |
1653 | */ | |
91ea40b9 TT |
1654 | static int nfs4_validate_mount_data(void *options, |
1655 | struct nfs_parsed_mount_data *args, | |
1656 | const char *dev_name) | |
f0768ebd | 1657 | { |
91ea40b9 | 1658 | struct nfs4_mount_data *data = (struct nfs4_mount_data *)options; |
f0768ebd CL |
1659 | char *c; |
1660 | ||
f16c9603 RK |
1661 | memset(args, 0, sizeof(*args)); |
1662 | ||
f0768ebd CL |
1663 | if (data == NULL) |
1664 | goto out_no_data; | |
1665 | ||
91ea40b9 TT |
1666 | args->rsize = NFS_MAX_FILE_IO_SIZE; |
1667 | args->wsize = NFS_MAX_FILE_IO_SIZE; | |
1668 | args->timeo = 600; | |
1669 | args->retrans = 2; | |
1670 | args->acregmin = 3; | |
1671 | args->acregmax = 60; | |
1672 | args->acdirmin = 30; | |
1673 | args->acdirmax = 60; | |
0896a725 | 1674 | args->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
91ea40b9 | 1675 | |
f0768ebd CL |
1676 | switch (data->version) { |
1677 | case 1: | |
91ea40b9 | 1678 | if (data->host_addrlen != sizeof(args->nfs_server.address)) |
f0768ebd | 1679 | goto out_no_address; |
91ea40b9 TT |
1680 | if (copy_from_user(&args->nfs_server.address, |
1681 | data->host_addr, | |
20c71f5e | 1682 | sizeof(args->nfs_server.address))) |
f0768ebd | 1683 | return -EFAULT; |
91ea40b9 TT |
1684 | if (!nfs_verify_server_address((struct sockaddr *) |
1685 | &args->nfs_server.address)) | |
f0768ebd CL |
1686 | goto out_no_address; |
1687 | ||
0d0f0c19 CL |
1688 | nfs4_default_port((struct sockaddr *) |
1689 | &args->nfs_server.address); | |
1690 | ||
f0768ebd CL |
1691 | switch (data->auth_flavourlen) { |
1692 | case 0: | |
91ea40b9 | 1693 | args->auth_flavors[0] = RPC_AUTH_UNIX; |
f0768ebd CL |
1694 | break; |
1695 | case 1: | |
20c71f5e | 1696 | if (copy_from_user(&args->auth_flavors[0], |
91ea40b9 | 1697 | data->auth_flavours, |
20c71f5e | 1698 | sizeof(args->auth_flavors[0]))) |
f0768ebd CL |
1699 | return -EFAULT; |
1700 | break; | |
1701 | default: | |
1702 | goto out_inval_auth; | |
1703 | } | |
1704 | ||
1705 | c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
1706 | if (IS_ERR(c)) | |
1707 | return PTR_ERR(c); | |
91ea40b9 | 1708 | args->nfs_server.hostname = c; |
f0768ebd CL |
1709 | |
1710 | c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
1711 | if (IS_ERR(c)) | |
1712 | return PTR_ERR(c); | |
91ea40b9 TT |
1713 | args->nfs_server.export_path = c; |
1714 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); | |
f0768ebd CL |
1715 | |
1716 | c = strndup_user(data->client_addr.data, 16); | |
1717 | if (IS_ERR(c)) | |
1718 | return PTR_ERR(c); | |
91ea40b9 TT |
1719 | args->client_address = c; |
1720 | ||
1721 | /* | |
1722 | * Translate to nfs_parsed_mount_data, which nfs4_fill_super | |
1723 | * can deal with. | |
1724 | */ | |
1725 | ||
1726 | args->flags = data->flags & NFS4_MOUNT_FLAGMASK; | |
1727 | args->rsize = data->rsize; | |
1728 | args->wsize = data->wsize; | |
1729 | args->timeo = data->timeo; | |
1730 | args->retrans = data->retrans; | |
1731 | args->acregmin = data->acregmin; | |
1732 | args->acregmax = data->acregmax; | |
1733 | args->acdirmin = data->acdirmin; | |
1734 | args->acdirmax = data->acdirmax; | |
1735 | args->nfs_server.protocol = data->proto; | |
f0768ebd CL |
1736 | |
1737 | break; | |
80071225 CL |
1738 | default: { |
1739 | unsigned int len; | |
91ea40b9 TT |
1740 | |
1741 | if (nfs_parse_mount_options((char *)options, args) == 0) | |
80071225 CL |
1742 | return -EINVAL; |
1743 | ||
1744 | if (!nfs_verify_server_address((struct sockaddr *) | |
91ea40b9 | 1745 | &args->nfs_server.address)) |
80071225 | 1746 | return -EINVAL; |
80071225 | 1747 | |
0d0f0c19 CL |
1748 | nfs4_default_port((struct sockaddr *) |
1749 | &args->nfs_server.address); | |
1750 | ||
91ea40b9 | 1751 | switch (args->auth_flavor_len) { |
80071225 | 1752 | case 0: |
91ea40b9 | 1753 | args->auth_flavors[0] = RPC_AUTH_UNIX; |
80071225 CL |
1754 | break; |
1755 | case 1: | |
80071225 CL |
1756 | break; |
1757 | default: | |
1758 | goto out_inval_auth; | |
1759 | } | |
1760 | ||
80071225 CL |
1761 | /* |
1762 | * Split "dev_name" into "hostname:mntpath". | |
1763 | */ | |
1764 | c = strchr(dev_name, ':'); | |
1765 | if (c == NULL) | |
1766 | return -EINVAL; | |
1767 | /* while calculating len, pretend ':' is '\0' */ | |
1768 | len = c - dev_name; | |
1769 | if (len > NFS4_MAXNAMLEN) | |
7d1cca72 | 1770 | return -ENAMETOOLONG; |
6a0ed1de CL |
1771 | /* N.B. caller will free nfs_server.hostname in all cases */ |
1772 | args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL); | |
80071225 CL |
1773 | |
1774 | c++; /* step over the ':' */ | |
1775 | len = strlen(c); | |
1776 | if (len > NFS4_MAXPATHLEN) | |
7d1cca72 | 1777 | return -ENAMETOOLONG; |
6a0ed1de | 1778 | args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL); |
80071225 | 1779 | |
6a0ed1de | 1780 | dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path); |
80071225 | 1781 | |
91ea40b9 | 1782 | if (args->client_address == NULL) |
0a87cf12 JL |
1783 | goto out_no_client_address; |
1784 | ||
80071225 CL |
1785 | break; |
1786 | } | |
f0768ebd CL |
1787 | } |
1788 | ||
1789 | return 0; | |
1790 | ||
1791 | out_no_data: | |
1792 | dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); | |
1793 | return -EINVAL; | |
1794 | ||
1795 | out_inval_auth: | |
1796 | dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", | |
1797 | data->auth_flavourlen); | |
1798 | return -EINVAL; | |
1799 | ||
1800 | out_no_address: | |
1801 | dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); | |
1802 | return -EINVAL; | |
0a87cf12 JL |
1803 | |
1804 | out_no_client_address: | |
1805 | dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n"); | |
1806 | return -EINVAL; | |
f0768ebd CL |
1807 | } |
1808 | ||
54ceac45 DH |
1809 | /* |
1810 | * Get the superblock for an NFS4 mountpoint | |
1811 | */ | |
816724e6 TM |
1812 | static int nfs4_get_sb(struct file_system_type *fs_type, |
1813 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 1814 | { |
91ea40b9 | 1815 | struct nfs_parsed_mount_data data; |
54ceac45 DH |
1816 | struct super_block *s; |
1817 | struct nfs_server *server; | |
54ceac45 DH |
1818 | struct nfs_fh mntfh; |
1819 | struct dentry *mntroot; | |
75180df2 | 1820 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
1821 | struct nfs_sb_mountdata sb_mntdata = { |
1822 | .mntflags = flags, | |
1823 | }; | |
54ceac45 | 1824 | int error; |
f7b422b1 | 1825 | |
f0768ebd | 1826 | /* Validate the mount data */ |
91ea40b9 | 1827 | error = nfs4_validate_mount_data(raw_data, &data, dev_name); |
f0768ebd CL |
1828 | if (error < 0) |
1829 | goto out; | |
f7b422b1 | 1830 | |
54ceac45 | 1831 | /* Get a volume representation */ |
91ea40b9 | 1832 | server = nfs4_create_server(&data, &mntfh); |
54ceac45 DH |
1833 | if (IS_ERR(server)) { |
1834 | error = PTR_ERR(server); | |
29eb981a | 1835 | goto out; |
f7b422b1 | 1836 | } |
e89a5a43 | 1837 | sb_mntdata.server = server; |
f7b422b1 | 1838 | |
75180df2 TM |
1839 | if (server->flags & NFS4_MOUNT_UNSHARED) |
1840 | compare_super = NULL; | |
1841 | ||
54ceac45 | 1842 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 1843 | s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata); |
816724e6 TM |
1844 | if (IS_ERR(s)) { |
1845 | error = PTR_ERR(s); | |
f7b422b1 | 1846 | goto out_free; |
816724e6 TM |
1847 | } |
1848 | ||
5dd3177a TM |
1849 | if (s->s_fs_info != server) { |
1850 | nfs_free_server(server); | |
1851 | server = NULL; | |
1852 | } | |
1853 | ||
54ceac45 DH |
1854 | if (!s->s_root) { |
1855 | /* initial superblock/root creation */ | |
54ceac45 | 1856 | nfs4_fill_super(s); |
54ceac45 | 1857 | } |
f7b422b1 | 1858 | |
54ceac45 DH |
1859 | mntroot = nfs4_get_root(s, &mntfh); |
1860 | if (IS_ERR(mntroot)) { | |
1861 | error = PTR_ERR(mntroot); | |
1862 | goto error_splat_super; | |
f7b422b1 | 1863 | } |
54ceac45 | 1864 | |
f7b422b1 | 1865 | s->s_flags |= MS_ACTIVE; |
54ceac45 DH |
1866 | mnt->mnt_sb = s; |
1867 | mnt->mnt_root = mntroot; | |
29eb981a CL |
1868 | error = 0; |
1869 | ||
1870 | out: | |
91ea40b9 TT |
1871 | kfree(data.client_address); |
1872 | kfree(data.nfs_server.export_path); | |
1873 | kfree(data.nfs_server.hostname); | |
29eb981a | 1874 | return error; |
54ceac45 | 1875 | |
f7b422b1 | 1876 | out_free: |
54ceac45 | 1877 | nfs_free_server(server); |
29eb981a | 1878 | goto out; |
54ceac45 DH |
1879 | |
1880 | error_splat_super: | |
1881 | up_write(&s->s_umount); | |
1882 | deactivate_super(s); | |
29eb981a | 1883 | goto out; |
f7b422b1 DH |
1884 | } |
1885 | ||
1886 | static void nfs4_kill_super(struct super_block *sb) | |
1887 | { | |
1888 | struct nfs_server *server = NFS_SB(sb); | |
1889 | ||
1890 | nfs_return_all_delegations(sb); | |
1891 | kill_anon_super(sb); | |
1892 | ||
1893 | nfs4_renewd_prepare_shutdown(server); | |
54ceac45 | 1894 | nfs_free_server(server); |
f7b422b1 DH |
1895 | } |
1896 | ||
1897 | /* | |
54ceac45 | 1898 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 1899 | */ |
54ceac45 DH |
1900 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, |
1901 | const char *dev_name, void *raw_data, | |
1902 | struct vfsmount *mnt) | |
f7b422b1 | 1903 | { |
54ceac45 DH |
1904 | struct nfs_clone_mount *data = raw_data; |
1905 | struct super_block *s; | |
1906 | struct nfs_server *server; | |
1907 | struct dentry *mntroot; | |
75180df2 | 1908 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
1909 | struct nfs_sb_mountdata sb_mntdata = { |
1910 | .mntflags = flags, | |
1911 | }; | |
54ceac45 | 1912 | int error; |
f7b422b1 | 1913 | |
54ceac45 | 1914 | dprintk("--> nfs4_xdev_get_sb()\n"); |
f7b422b1 | 1915 | |
54ceac45 DH |
1916 | /* create a new volume representation */ |
1917 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
1918 | if (IS_ERR(server)) { | |
1919 | error = PTR_ERR(server); | |
1920 | goto out_err_noserver; | |
f7b422b1 | 1921 | } |
e89a5a43 | 1922 | sb_mntdata.server = server; |
f7b422b1 | 1923 | |
75180df2 TM |
1924 | if (server->flags & NFS4_MOUNT_UNSHARED) |
1925 | compare_super = NULL; | |
1926 | ||
54ceac45 | 1927 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 1928 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
1929 | if (IS_ERR(s)) { |
1930 | error = PTR_ERR(s); | |
1931 | goto out_err_nosb; | |
f7b422b1 | 1932 | } |
f7b422b1 | 1933 | |
54ceac45 DH |
1934 | if (s->s_fs_info != server) { |
1935 | nfs_free_server(server); | |
1936 | server = NULL; | |
1937 | } | |
f7b422b1 | 1938 | |
54ceac45 DH |
1939 | if (!s->s_root) { |
1940 | /* initial superblock/root creation */ | |
54ceac45 DH |
1941 | nfs4_clone_super(s, data->sb); |
1942 | } | |
f7b422b1 | 1943 | |
54ceac45 DH |
1944 | mntroot = nfs4_get_root(s, data->fh); |
1945 | if (IS_ERR(mntroot)) { | |
1946 | error = PTR_ERR(mntroot); | |
1947 | goto error_splat_super; | |
1948 | } | |
e9cc6c23 TM |
1949 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
1950 | dput(mntroot); | |
1951 | error = -ESTALE; | |
1952 | goto error_splat_super; | |
1953 | } | |
f7b422b1 | 1954 | |
54ceac45 DH |
1955 | s->s_flags |= MS_ACTIVE; |
1956 | mnt->mnt_sb = s; | |
1957 | mnt->mnt_root = mntroot; | |
1958 | ||
1959 | dprintk("<-- nfs4_xdev_get_sb() = 0\n"); | |
1960 | return 0; | |
1961 | ||
1962 | out_err_nosb: | |
1963 | nfs_free_server(server); | |
1964 | out_err_noserver: | |
1965 | dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); | |
1966 | return error; | |
1967 | ||
1968 | error_splat_super: | |
1969 | up_write(&s->s_umount); | |
1970 | deactivate_super(s); | |
1971 | dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); | |
1972 | return error; | |
f7b422b1 DH |
1973 | } |
1974 | ||
54ceac45 DH |
1975 | /* |
1976 | * Create an NFS4 server record on referral traversal | |
1977 | */ | |
1978 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, | |
1979 | const char *dev_name, void *raw_data, | |
1980 | struct vfsmount *mnt) | |
f7b422b1 DH |
1981 | { |
1982 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
1983 | struct super_block *s; |
1984 | struct nfs_server *server; | |
1985 | struct dentry *mntroot; | |
1986 | struct nfs_fh mntfh; | |
75180df2 | 1987 | int (*compare_super)(struct super_block *, void *) = nfs_compare_super; |
e89a5a43 TM |
1988 | struct nfs_sb_mountdata sb_mntdata = { |
1989 | .mntflags = flags, | |
1990 | }; | |
54ceac45 DH |
1991 | int error; |
1992 | ||
1993 | dprintk("--> nfs4_referral_get_sb()\n"); | |
1994 | ||
1995 | /* create a new volume representation */ | |
1996 | server = nfs4_create_referral_server(data, &mntfh); | |
1997 | if (IS_ERR(server)) { | |
1998 | error = PTR_ERR(server); | |
1999 | goto out_err_noserver; | |
2000 | } | |
e89a5a43 | 2001 | sb_mntdata.server = server; |
54ceac45 | 2002 | |
75180df2 TM |
2003 | if (server->flags & NFS4_MOUNT_UNSHARED) |
2004 | compare_super = NULL; | |
2005 | ||
54ceac45 | 2006 | /* Get a superblock - note that we may end up sharing one that already exists */ |
e89a5a43 | 2007 | s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata); |
54ceac45 DH |
2008 | if (IS_ERR(s)) { |
2009 | error = PTR_ERR(s); | |
2010 | goto out_err_nosb; | |
2011 | } | |
2012 | ||
2013 | if (s->s_fs_info != server) { | |
2014 | nfs_free_server(server); | |
2015 | server = NULL; | |
2016 | } | |
2017 | ||
2018 | if (!s->s_root) { | |
2019 | /* initial superblock/root creation */ | |
54ceac45 DH |
2020 | nfs4_fill_super(s); |
2021 | } | |
2022 | ||
f2d0d85e | 2023 | mntroot = nfs4_get_root(s, &mntfh); |
54ceac45 DH |
2024 | if (IS_ERR(mntroot)) { |
2025 | error = PTR_ERR(mntroot); | |
2026 | goto error_splat_super; | |
2027 | } | |
e9cc6c23 TM |
2028 | if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) { |
2029 | dput(mntroot); | |
2030 | error = -ESTALE; | |
2031 | goto error_splat_super; | |
2032 | } | |
54ceac45 DH |
2033 | |
2034 | s->s_flags |= MS_ACTIVE; | |
2035 | mnt->mnt_sb = s; | |
2036 | mnt->mnt_root = mntroot; | |
2037 | ||
2038 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); | |
2039 | return 0; | |
2040 | ||
2041 | out_err_nosb: | |
2042 | nfs_free_server(server); | |
2043 | out_err_noserver: | |
2044 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); | |
2045 | return error; | |
2046 | ||
2047 | error_splat_super: | |
2048 | up_write(&s->s_umount); | |
2049 | deactivate_super(s); | |
2050 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); | |
2051 | return error; | |
f7b422b1 DH |
2052 | } |
2053 | ||
54ceac45 | 2054 | #endif /* CONFIG_NFS_V4 */ |