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 | * | |
16 | */ | |
17 | ||
18 | #include <linux/config.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | ||
22 | #include <linux/time.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/stat.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/unistd.h> | |
29 | #include <linux/sunrpc/clnt.h> | |
30 | #include <linux/sunrpc/stats.h> | |
31 | #include <linux/sunrpc/metrics.h> | |
32 | #include <linux/nfs_fs.h> | |
33 | #include <linux/nfs_mount.h> | |
34 | #include <linux/nfs4_mount.h> | |
35 | #include <linux/lockd/bind.h> | |
36 | #include <linux/smp_lock.h> | |
37 | #include <linux/seq_file.h> | |
38 | #include <linux/mount.h> | |
39 | #include <linux/nfs_idmap.h> | |
40 | #include <linux/vfs.h> | |
41 | #include <linux/inet.h> | |
42 | #include <linux/nfs_xdr.h> | |
43 | ||
44 | #include <asm/system.h> | |
45 | #include <asm/uaccess.h> | |
46 | ||
47 | #include "nfs4_fs.h" | |
48 | #include "callback.h" | |
49 | #include "delegation.h" | |
50 | #include "iostat.h" | |
51 | #include "internal.h" | |
52 | ||
53 | #define NFSDBG_FACILITY NFSDBG_VFS | |
54 | ||
55 | /* Maximum number of readahead requests | |
56 | * FIXME: this should really be a sysctl so that users may tune it to suit | |
57 | * their needs. People that do NFS over a slow network, might for | |
58 | * instance want to reduce it to something closer to 1 for improved | |
59 | * interactive response. | |
60 | */ | |
61 | #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) | |
62 | ||
63 | /* | |
64 | * RPC cruft for NFS | |
65 | */ | |
66 | static struct rpc_version * nfs_version[] = { | |
67 | NULL, | |
68 | NULL, | |
69 | &nfs_version2, | |
70 | #if defined(CONFIG_NFS_V3) | |
71 | &nfs_version3, | |
72 | #elif defined(CONFIG_NFS_V4) | |
73 | NULL, | |
74 | #endif | |
75 | #if defined(CONFIG_NFS_V4) | |
76 | &nfs_version4, | |
77 | #endif | |
78 | }; | |
79 | ||
80 | static struct rpc_program nfs_program = { | |
81 | .name = "nfs", | |
82 | .number = NFS_PROGRAM, | |
83 | .nrvers = ARRAY_SIZE(nfs_version), | |
84 | .version = nfs_version, | |
85 | .stats = &nfs_rpcstat, | |
86 | .pipe_dir_name = "/nfs", | |
87 | }; | |
88 | ||
89 | struct rpc_stat nfs_rpcstat = { | |
90 | .program = &nfs_program | |
91 | }; | |
92 | ||
93 | ||
94 | #ifdef CONFIG_NFS_V3_ACL | |
95 | static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program }; | |
96 | static struct rpc_version * nfsacl_version[] = { | |
97 | [3] = &nfsacl_version3, | |
98 | }; | |
99 | ||
100 | struct rpc_program nfsacl_program = { | |
101 | .name = "nfsacl", | |
102 | .number = NFS_ACL_PROGRAM, | |
103 | .nrvers = ARRAY_SIZE(nfsacl_version), | |
104 | .version = nfsacl_version, | |
105 | .stats = &nfsacl_rpcstat, | |
106 | }; | |
107 | #endif /* CONFIG_NFS_V3_ACL */ | |
108 | ||
109 | static void nfs_umount_begin(struct vfsmount *, int); | |
816724e6 | 110 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
f7b422b1 DH |
111 | static int nfs_show_options(struct seq_file *, struct vfsmount *); |
112 | static int nfs_show_stats(struct seq_file *, struct vfsmount *); | |
816724e6 TM |
113 | static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); |
114 | static int nfs_clone_nfs_sb(struct file_system_type *fs_type, | |
115 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
f7b422b1 DH |
116 | static void nfs_kill_super(struct super_block *); |
117 | ||
118 | static struct file_system_type nfs_fs_type = { | |
119 | .owner = THIS_MODULE, | |
120 | .name = "nfs", | |
121 | .get_sb = nfs_get_sb, | |
122 | .kill_sb = nfs_kill_super, | |
123 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
124 | }; | |
125 | ||
126 | struct file_system_type clone_nfs_fs_type = { | |
127 | .owner = THIS_MODULE, | |
128 | .name = "nfs", | |
129 | .get_sb = nfs_clone_nfs_sb, | |
130 | .kill_sb = nfs_kill_super, | |
131 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
132 | }; | |
133 | ||
134 | static struct super_operations nfs_sops = { | |
135 | .alloc_inode = nfs_alloc_inode, | |
136 | .destroy_inode = nfs_destroy_inode, | |
137 | .write_inode = nfs_write_inode, | |
138 | .statfs = nfs_statfs, | |
139 | .clear_inode = nfs_clear_inode, | |
140 | .umount_begin = nfs_umount_begin, | |
141 | .show_options = nfs_show_options, | |
142 | .show_stats = nfs_show_stats, | |
143 | }; | |
144 | ||
145 | #ifdef CONFIG_NFS_V4 | |
816724e6 TM |
146 | static int nfs4_get_sb(struct file_system_type *fs_type, |
147 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
148 | static int nfs_clone_nfs4_sb(struct file_system_type *fs_type, | |
149 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
150 | static int nfs_referral_nfs4_sb(struct file_system_type *fs_type, | |
151 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
f7b422b1 DH |
152 | static void nfs4_kill_super(struct super_block *sb); |
153 | ||
154 | static struct file_system_type nfs4_fs_type = { | |
155 | .owner = THIS_MODULE, | |
156 | .name = "nfs4", | |
157 | .get_sb = nfs4_get_sb, | |
158 | .kill_sb = nfs4_kill_super, | |
159 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
160 | }; | |
161 | ||
162 | struct file_system_type clone_nfs4_fs_type = { | |
163 | .owner = THIS_MODULE, | |
164 | .name = "nfs4", | |
165 | .get_sb = nfs_clone_nfs4_sb, | |
166 | .kill_sb = nfs4_kill_super, | |
167 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
168 | }; | |
169 | ||
170 | struct file_system_type nfs_referral_nfs4_fs_type = { | |
171 | .owner = THIS_MODULE, | |
172 | .name = "nfs4", | |
173 | .get_sb = nfs_referral_nfs4_sb, | |
174 | .kill_sb = nfs4_kill_super, | |
175 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
176 | }; | |
177 | ||
178 | static struct super_operations nfs4_sops = { | |
179 | .alloc_inode = nfs_alloc_inode, | |
180 | .destroy_inode = nfs_destroy_inode, | |
181 | .write_inode = nfs_write_inode, | |
182 | .statfs = nfs_statfs, | |
183 | .clear_inode = nfs4_clear_inode, | |
184 | .umount_begin = nfs_umount_begin, | |
185 | .show_options = nfs_show_options, | |
186 | .show_stats = nfs_show_stats, | |
187 | }; | |
188 | #endif | |
189 | ||
979df72e TM |
190 | static struct shrinker *acl_shrinker; |
191 | ||
f7b422b1 DH |
192 | /* |
193 | * Register the NFS filesystems | |
194 | */ | |
195 | int __init register_nfs_fs(void) | |
196 | { | |
197 | int ret; | |
198 | ||
199 | ret = register_filesystem(&nfs_fs_type); | |
200 | if (ret < 0) | |
201 | goto error_0; | |
202 | ||
203 | #ifdef CONFIG_NFS_V4 | |
204 | ret = nfs_register_sysctl(); | |
205 | if (ret < 0) | |
206 | goto error_1; | |
207 | ret = register_filesystem(&nfs4_fs_type); | |
208 | if (ret < 0) | |
209 | goto error_2; | |
210 | #endif | |
979df72e | 211 | acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker); |
f7b422b1 DH |
212 | return 0; |
213 | ||
214 | #ifdef CONFIG_NFS_V4 | |
215 | error_2: | |
216 | nfs_unregister_sysctl(); | |
217 | error_1: | |
218 | unregister_filesystem(&nfs_fs_type); | |
219 | #endif | |
220 | error_0: | |
221 | return ret; | |
222 | } | |
223 | ||
224 | /* | |
225 | * Unregister the NFS filesystems | |
226 | */ | |
227 | void __exit unregister_nfs_fs(void) | |
228 | { | |
979df72e TM |
229 | if (acl_shrinker != NULL) |
230 | remove_shrinker(acl_shrinker); | |
f7b422b1 DH |
231 | #ifdef CONFIG_NFS_V4 |
232 | unregister_filesystem(&nfs4_fs_type); | |
233 | nfs_unregister_sysctl(); | |
234 | #endif | |
235 | unregister_filesystem(&nfs_fs_type); | |
236 | } | |
237 | ||
238 | /* | |
239 | * Deliver file system statistics to userspace | |
240 | */ | |
816724e6 | 241 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 242 | { |
816724e6 | 243 | struct super_block *sb = dentry->d_sb; |
f7b422b1 DH |
244 | struct nfs_server *server = NFS_SB(sb); |
245 | unsigned char blockbits; | |
246 | unsigned long blockres; | |
247 | struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode); | |
248 | struct nfs_fattr fattr; | |
249 | struct nfs_fsstat res = { | |
250 | .fattr = &fattr, | |
251 | }; | |
252 | int error; | |
253 | ||
254 | lock_kernel(); | |
255 | ||
256 | error = server->rpc_ops->statfs(server, rootfh, &res); | |
257 | buf->f_type = NFS_SUPER_MAGIC; | |
258 | if (error < 0) | |
259 | goto out_err; | |
260 | ||
261 | /* | |
262 | * Current versions of glibc do not correctly handle the | |
263 | * case where f_frsize != f_bsize. Eventually we want to | |
264 | * report the value of wtmult in this field. | |
265 | */ | |
266 | buf->f_frsize = sb->s_blocksize; | |
267 | ||
268 | /* | |
269 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
270 | * are reported in units of f_frsize. Linux hasn't had | |
271 | * an f_frsize field in its statfs struct until recently, | |
272 | * thus historically Linux's sys_statfs reports these | |
273 | * fields in units of f_bsize. | |
274 | */ | |
275 | buf->f_bsize = sb->s_blocksize; | |
276 | blockbits = sb->s_blocksize_bits; | |
277 | blockres = (1 << blockbits) - 1; | |
278 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
279 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
280 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
281 | ||
282 | buf->f_files = res.tfiles; | |
283 | buf->f_ffree = res.afiles; | |
284 | ||
285 | buf->f_namelen = server->namelen; | |
286 | out: | |
287 | unlock_kernel(); | |
288 | return 0; | |
289 | ||
290 | out_err: | |
291 | dprintk("%s: statfs error = %d\n", __FUNCTION__, -error); | |
292 | buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; | |
293 | goto out; | |
294 | ||
295 | } | |
296 | ||
7d4e2747 DH |
297 | /* |
298 | * Map the security flavour number to a name | |
299 | */ | |
81039f1f TM |
300 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
301 | { | |
7d4e2747 | 302 | static const struct { |
81039f1f TM |
303 | rpc_authflavor_t flavour; |
304 | const char *str; | |
305 | } sec_flavours[] = { | |
306 | { RPC_AUTH_NULL, "null" }, | |
307 | { RPC_AUTH_UNIX, "sys" }, | |
308 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
309 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
310 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
311 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
312 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
313 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
314 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
315 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
316 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
317 | { -1, "unknown" } | |
318 | }; | |
319 | int i; | |
320 | ||
321 | for (i=0; sec_flavours[i].flavour != -1; i++) { | |
322 | if (sec_flavours[i].flavour == flavour) | |
323 | break; | |
324 | } | |
325 | return sec_flavours[i].str; | |
326 | } | |
327 | ||
f7b422b1 DH |
328 | /* |
329 | * Describe the mount options in force on this server representation | |
330 | */ | |
331 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) | |
332 | { | |
333 | static struct proc_nfs_info { | |
334 | int flag; | |
335 | char *str; | |
336 | char *nostr; | |
337 | } nfs_info[] = { | |
338 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
339 | { NFS_MOUNT_INTR, ",intr", "" }, | |
340 | { NFS_MOUNT_NOCTO, ",nocto", "" }, | |
341 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
342 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
343 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
344 | { 0, NULL, NULL } | |
345 | }; | |
346 | struct proc_nfs_info *nfs_infop; | |
347 | char buf[12]; | |
348 | char *proto; | |
349 | ||
350 | seq_printf(m, ",vers=%d", nfss->rpc_ops->version); | |
351 | seq_printf(m, ",rsize=%d", nfss->rsize); | |
352 | seq_printf(m, ",wsize=%d", nfss->wsize); | |
353 | if (nfss->acregmin != 3*HZ || showdefaults) | |
354 | seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); | |
355 | if (nfss->acregmax != 60*HZ || showdefaults) | |
356 | seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); | |
357 | if (nfss->acdirmin != 30*HZ || showdefaults) | |
358 | seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); | |
359 | if (nfss->acdirmax != 60*HZ || showdefaults) | |
360 | seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); | |
361 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { | |
362 | if (nfss->flags & nfs_infop->flag) | |
363 | seq_puts(m, nfs_infop->str); | |
364 | else | |
365 | seq_puts(m, nfs_infop->nostr); | |
366 | } | |
367 | switch (nfss->client->cl_xprt->prot) { | |
368 | case IPPROTO_TCP: | |
369 | proto = "tcp"; | |
370 | break; | |
371 | case IPPROTO_UDP: | |
372 | proto = "udp"; | |
373 | break; | |
374 | default: | |
375 | snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot); | |
376 | proto = buf; | |
377 | } | |
378 | seq_printf(m, ",proto=%s", proto); | |
379 | seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ); | |
380 | seq_printf(m, ",retrans=%u", nfss->retrans_count); | |
81039f1f | 381 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
f7b422b1 DH |
382 | } |
383 | ||
384 | /* | |
385 | * Describe the mount options on this VFS mountpoint | |
386 | */ | |
387 | static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
388 | { | |
389 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
390 | ||
391 | nfs_show_mount_options(m, nfss, 0); | |
392 | ||
393 | seq_puts(m, ",addr="); | |
394 | seq_escape(m, nfss->hostname, " \t\n\\"); | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | /* | |
400 | * Present statistical information for this VFS mountpoint | |
401 | */ | |
402 | static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) | |
403 | { | |
404 | int i, cpu; | |
405 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
406 | struct rpc_auth *auth = nfss->client->cl_auth; | |
407 | struct nfs_iostats totals = { }; | |
408 | ||
409 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
410 | ||
411 | /* | |
412 | * Display all mount option settings | |
413 | */ | |
414 | seq_printf(m, "\n\topts:\t"); | |
415 | seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); | |
416 | seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
417 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
418 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
419 | nfs_show_mount_options(m, nfss, 1); | |
420 | ||
421 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
422 | ||
423 | seq_printf(m, "\n\tcaps:\t"); | |
424 | seq_printf(m, "caps=0x%x", nfss->caps); | |
425 | seq_printf(m, ",wtmult=%d", nfss->wtmult); | |
426 | seq_printf(m, ",dtsize=%d", nfss->dtsize); | |
427 | seq_printf(m, ",bsize=%d", nfss->bsize); | |
428 | seq_printf(m, ",namelen=%d", nfss->namelen); | |
429 | ||
430 | #ifdef CONFIG_NFS_V4 | |
431 | if (nfss->rpc_ops->version == 4) { | |
432 | seq_printf(m, "\n\tnfsv4:\t"); | |
433 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
434 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
435 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
436 | } | |
437 | #endif | |
438 | ||
439 | /* | |
440 | * Display security flavor in effect for this mount | |
441 | */ | |
442 | seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor); | |
443 | if (auth->au_flavor) | |
444 | seq_printf(m, ",pseudoflavor=%d", auth->au_flavor); | |
445 | ||
446 | /* | |
447 | * Display superblock I/O counters | |
448 | */ | |
449 | for_each_possible_cpu(cpu) { | |
450 | struct nfs_iostats *stats; | |
451 | ||
452 | preempt_disable(); | |
453 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
454 | ||
455 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
456 | totals.events[i] += stats->events[i]; | |
457 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
458 | totals.bytes[i] += stats->bytes[i]; | |
459 | ||
460 | preempt_enable(); | |
461 | } | |
462 | ||
463 | seq_printf(m, "\n\tevents:\t"); | |
464 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
465 | seq_printf(m, "%lu ", totals.events[i]); | |
466 | seq_printf(m, "\n\tbytes:\t"); | |
467 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
468 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
469 | seq_printf(m, "\n"); | |
470 | ||
471 | rpc_print_iostats(m, nfss->client); | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
478 | * in response to traversals | |
479 | */ | |
480 | static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags) | |
481 | { | |
482 | struct nfs_server *server; | |
483 | struct rpc_clnt *rpc; | |
484 | ||
485 | shrink_submounts(vfsmnt, &nfs_automount_list); | |
486 | if (!(flags & MNT_FORCE)) | |
487 | return; | |
488 | /* -EIO all pending I/O */ | |
489 | server = NFS_SB(vfsmnt->mnt_sb); | |
490 | rpc = server->client; | |
491 | if (!IS_ERR(rpc)) | |
492 | rpc_killall_tasks(rpc); | |
493 | rpc = server->client_acl; | |
494 | if (!IS_ERR(rpc)) | |
495 | rpc_killall_tasks(rpc); | |
496 | } | |
497 | ||
498 | /* | |
499 | * Obtain the root inode of the file system. | |
500 | */ | |
501 | static struct inode * | |
502 | nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo) | |
503 | { | |
504 | struct nfs_server *server = NFS_SB(sb); | |
505 | int error; | |
506 | ||
507 | error = server->rpc_ops->getroot(server, rootfh, fsinfo); | |
508 | if (error < 0) { | |
509 | dprintk("nfs_get_root: getattr error = %d\n", -error); | |
510 | return ERR_PTR(error); | |
511 | } | |
512 | ||
513 | server->fsid = fsinfo->fattr->fsid; | |
514 | return nfs_fhget(sb, rootfh, fsinfo->fattr); | |
515 | } | |
516 | ||
517 | /* | |
518 | * Do NFS version-independent mount processing, and sanity checking | |
519 | */ | |
520 | static int | |
521 | nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor) | |
522 | { | |
523 | struct nfs_server *server; | |
524 | struct inode *root_inode; | |
525 | struct nfs_fattr fattr; | |
526 | struct nfs_fsinfo fsinfo = { | |
527 | .fattr = &fattr, | |
528 | }; | |
529 | struct nfs_pathconf pathinfo = { | |
530 | .fattr = &fattr, | |
531 | }; | |
532 | int no_root_error = 0; | |
533 | unsigned long max_rpc_payload; | |
534 | ||
535 | /* We probably want something more informative here */ | |
536 | snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
537 | ||
538 | server = NFS_SB(sb); | |
539 | ||
540 | sb->s_magic = NFS_SUPER_MAGIC; | |
541 | ||
542 | server->io_stats = nfs_alloc_iostats(); | |
543 | if (server->io_stats == NULL) | |
544 | return -ENOMEM; | |
545 | ||
546 | root_inode = nfs_get_root(sb, &server->fh, &fsinfo); | |
547 | /* Did getting the root inode fail? */ | |
548 | if (IS_ERR(root_inode)) { | |
549 | no_root_error = PTR_ERR(root_inode); | |
550 | goto out_no_root; | |
551 | } | |
552 | sb->s_root = d_alloc_root(root_inode); | |
553 | if (!sb->s_root) { | |
554 | no_root_error = -ENOMEM; | |
555 | goto out_no_root; | |
556 | } | |
557 | sb->s_root->d_op = server->rpc_ops->dentry_ops; | |
558 | ||
559 | /* mount time stamp, in seconds */ | |
560 | server->mount_time = jiffies; | |
561 | ||
562 | /* Get some general file system info */ | |
563 | if (server->namelen == 0 && | |
564 | server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0) | |
565 | server->namelen = pathinfo.max_namelen; | |
566 | /* Work out a lot of parameters */ | |
567 | if (server->rsize == 0) | |
568 | server->rsize = nfs_block_size(fsinfo.rtpref, NULL); | |
569 | if (server->wsize == 0) | |
570 | server->wsize = nfs_block_size(fsinfo.wtpref, NULL); | |
571 | ||
572 | if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax) | |
573 | server->rsize = nfs_block_size(fsinfo.rtmax, NULL); | |
574 | if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax) | |
575 | server->wsize = nfs_block_size(fsinfo.wtmax, NULL); | |
576 | ||
577 | max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); | |
578 | if (server->rsize > max_rpc_payload) | |
579 | server->rsize = max_rpc_payload; | |
580 | if (server->rsize > NFS_MAX_FILE_IO_SIZE) | |
581 | server->rsize = NFS_MAX_FILE_IO_SIZE; | |
582 | server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
583 | ||
584 | if (server->wsize > max_rpc_payload) | |
585 | server->wsize = max_rpc_payload; | |
586 | if (server->wsize > NFS_MAX_FILE_IO_SIZE) | |
587 | server->wsize = NFS_MAX_FILE_IO_SIZE; | |
588 | server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
589 | ||
590 | if (sb->s_blocksize == 0) | |
591 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
592 | &sb->s_blocksize_bits); | |
593 | server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL); | |
594 | ||
595 | server->dtsize = nfs_block_size(fsinfo.dtpref, NULL); | |
596 | if (server->dtsize > PAGE_CACHE_SIZE) | |
597 | server->dtsize = PAGE_CACHE_SIZE; | |
598 | if (server->dtsize > server->rsize) | |
599 | server->dtsize = server->rsize; | |
600 | ||
601 | if (server->flags & NFS_MOUNT_NOAC) { | |
602 | server->acregmin = server->acregmax = 0; | |
603 | server->acdirmin = server->acdirmax = 0; | |
604 | sb->s_flags |= MS_SYNCHRONOUS; | |
605 | } | |
606 | server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; | |
607 | ||
608 | nfs_super_set_maxbytes(sb, fsinfo.maxfilesize); | |
609 | ||
610 | server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0; | |
611 | server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0; | |
612 | ||
613 | /* We're airborne Set socket buffersize */ | |
614 | rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); | |
615 | return 0; | |
616 | /* Yargs. It didn't work out. */ | |
617 | out_no_root: | |
618 | dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error); | |
619 | if (!IS_ERR(root_inode)) | |
620 | iput(root_inode); | |
621 | return no_root_error; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Initialise the timeout values for a connection | |
626 | */ | |
627 | static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans) | |
628 | { | |
629 | to->to_initval = timeo * HZ / 10; | |
630 | to->to_retries = retrans; | |
631 | if (!to->to_retries) | |
632 | to->to_retries = 2; | |
633 | ||
634 | switch (proto) { | |
635 | case IPPROTO_TCP: | |
636 | if (!to->to_initval) | |
637 | to->to_initval = 60 * HZ; | |
638 | if (to->to_initval > NFS_MAX_TCP_TIMEOUT) | |
639 | to->to_initval = NFS_MAX_TCP_TIMEOUT; | |
640 | to->to_increment = to->to_initval; | |
641 | to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); | |
642 | to->to_exponential = 0; | |
643 | break; | |
644 | case IPPROTO_UDP: | |
645 | default: | |
646 | if (!to->to_initval) | |
647 | to->to_initval = 11 * HZ / 10; | |
648 | if (to->to_initval > NFS_MAX_UDP_TIMEOUT) | |
649 | to->to_initval = NFS_MAX_UDP_TIMEOUT; | |
650 | to->to_maxval = NFS_MAX_UDP_TIMEOUT; | |
651 | to->to_exponential = 1; | |
652 | break; | |
653 | } | |
654 | } | |
655 | ||
656 | /* | |
657 | * Create an RPC client handle. | |
658 | */ | |
659 | static struct rpc_clnt * | |
660 | nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data) | |
661 | { | |
662 | struct rpc_timeout timeparms; | |
663 | struct rpc_xprt *xprt = NULL; | |
664 | struct rpc_clnt *clnt = NULL; | |
665 | int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; | |
666 | ||
667 | nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans); | |
668 | ||
669 | server->retrans_timeo = timeparms.to_initval; | |
670 | server->retrans_count = timeparms.to_retries; | |
671 | ||
672 | /* create transport and client */ | |
673 | xprt = xprt_create_proto(proto, &server->addr, &timeparms); | |
674 | if (IS_ERR(xprt)) { | |
675 | dprintk("%s: cannot create RPC transport. Error = %ld\n", | |
676 | __FUNCTION__, PTR_ERR(xprt)); | |
677 | return (struct rpc_clnt *)xprt; | |
678 | } | |
679 | clnt = rpc_create_client(xprt, server->hostname, &nfs_program, | |
680 | server->rpc_ops->version, data->pseudoflavor); | |
681 | if (IS_ERR(clnt)) { | |
682 | dprintk("%s: cannot create RPC client. Error = %ld\n", | |
683 | __FUNCTION__, PTR_ERR(xprt)); | |
684 | goto out_fail; | |
685 | } | |
686 | ||
687 | clnt->cl_intr = 1; | |
688 | clnt->cl_softrtry = 1; | |
689 | ||
690 | return clnt; | |
691 | ||
692 | out_fail: | |
693 | return clnt; | |
694 | } | |
695 | ||
696 | /* | |
697 | * Clone a server record | |
698 | */ | |
699 | static struct nfs_server *nfs_clone_server(struct super_block *sb, struct nfs_clone_mount *data) | |
700 | { | |
701 | struct nfs_server *server = NFS_SB(sb); | |
702 | struct nfs_server *parent = NFS_SB(data->sb); | |
703 | struct inode *root_inode; | |
704 | struct nfs_fsinfo fsinfo; | |
705 | void *err = ERR_PTR(-ENOMEM); | |
706 | ||
707 | sb->s_op = data->sb->s_op; | |
708 | sb->s_blocksize = data->sb->s_blocksize; | |
709 | sb->s_blocksize_bits = data->sb->s_blocksize_bits; | |
710 | sb->s_maxbytes = data->sb->s_maxbytes; | |
711 | ||
712 | server->client_sys = server->client_acl = ERR_PTR(-EINVAL); | |
713 | server->io_stats = nfs_alloc_iostats(); | |
714 | if (server->io_stats == NULL) | |
715 | goto out; | |
716 | ||
717 | server->client = rpc_clone_client(parent->client); | |
718 | if (IS_ERR((err = server->client))) | |
719 | goto out; | |
720 | ||
721 | if (!IS_ERR(parent->client_sys)) { | |
722 | server->client_sys = rpc_clone_client(parent->client_sys); | |
723 | if (IS_ERR((err = server->client_sys))) | |
724 | goto out; | |
725 | } | |
726 | if (!IS_ERR(parent->client_acl)) { | |
727 | server->client_acl = rpc_clone_client(parent->client_acl); | |
728 | if (IS_ERR((err = server->client_acl))) | |
729 | goto out; | |
730 | } | |
731 | root_inode = nfs_fhget(sb, data->fh, data->fattr); | |
732 | if (!root_inode) | |
733 | goto out; | |
734 | sb->s_root = d_alloc_root(root_inode); | |
735 | if (!sb->s_root) | |
736 | goto out_put_root; | |
737 | fsinfo.fattr = data->fattr; | |
738 | if (NFS_PROTO(root_inode)->fsinfo(server, data->fh, &fsinfo) == 0) | |
739 | nfs_super_set_maxbytes(sb, fsinfo.maxfilesize); | |
740 | sb->s_root->d_op = server->rpc_ops->dentry_ops; | |
741 | sb->s_flags |= MS_ACTIVE; | |
742 | return server; | |
743 | out_put_root: | |
744 | iput(root_inode); | |
745 | out: | |
746 | return err; | |
747 | } | |
748 | ||
749 | /* | |
750 | * Copy an existing superblock and attach revised data | |
751 | */ | |
816724e6 | 752 | static int nfs_clone_generic_sb(struct nfs_clone_mount *data, |
f7b422b1 | 753 | struct super_block *(*fill_sb)(struct nfs_server *, struct nfs_clone_mount *), |
816724e6 TM |
754 | struct nfs_server *(*fill_server)(struct super_block *, struct nfs_clone_mount *), |
755 | struct vfsmount *mnt) | |
f7b422b1 DH |
756 | { |
757 | struct nfs_server *server; | |
758 | struct nfs_server *parent = NFS_SB(data->sb); | |
759 | struct super_block *sb = ERR_PTR(-EINVAL); | |
f7b422b1 | 760 | char *hostname; |
816724e6 | 761 | int error = -ENOMEM; |
f7b422b1 DH |
762 | int len; |
763 | ||
764 | server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); | |
765 | if (server == NULL) | |
766 | goto out_err; | |
767 | memcpy(server, parent, sizeof(*server)); | |
768 | hostname = (data->hostname != NULL) ? data->hostname : parent->hostname; | |
769 | len = strlen(hostname) + 1; | |
770 | server->hostname = kmalloc(len, GFP_KERNEL); | |
771 | if (server->hostname == NULL) | |
772 | goto free_server; | |
773 | memcpy(server->hostname, hostname, len); | |
816724e6 TM |
774 | error = rpciod_up(); |
775 | if (error != 0) | |
f7b422b1 DH |
776 | goto free_hostname; |
777 | ||
778 | sb = fill_sb(server, data); | |
816724e6 TM |
779 | if (IS_ERR(sb)) { |
780 | error = PTR_ERR(sb); | |
f7b422b1 | 781 | goto kill_rpciod; |
816724e6 TM |
782 | } |
783 | ||
784 | if (sb->s_root) | |
785 | goto out_rpciod_down; | |
f7b422b1 DH |
786 | |
787 | server = fill_server(sb, data); | |
816724e6 TM |
788 | if (IS_ERR(server)) { |
789 | error = PTR_ERR(server); | |
f7b422b1 | 790 | goto out_deactivate; |
816724e6 TM |
791 | } |
792 | return simple_set_mnt(mnt, sb); | |
f7b422b1 DH |
793 | out_deactivate: |
794 | up_write(&sb->s_umount); | |
795 | deactivate_super(sb); | |
816724e6 TM |
796 | return error; |
797 | out_rpciod_down: | |
798 | rpciod_down(); | |
799 | kfree(server->hostname); | |
800 | kfree(server); | |
801 | return simple_set_mnt(mnt, sb); | |
f7b422b1 DH |
802 | kill_rpciod: |
803 | rpciod_down(); | |
804 | free_hostname: | |
805 | kfree(server->hostname); | |
806 | free_server: | |
807 | kfree(server); | |
808 | out_err: | |
816724e6 | 809 | return error; |
f7b422b1 DH |
810 | } |
811 | ||
812 | /* | |
813 | * Set up an NFS2/3 superblock | |
814 | * | |
815 | * The way this works is that the mount process passes a structure | |
816 | * in the data argument which contains the server's IP address | |
817 | * and the root file handle obtained from the server's mount | |
818 | * daemon. We stash these away in the private superblock fields. | |
819 | */ | |
820 | static int | |
821 | nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent) | |
822 | { | |
823 | struct nfs_server *server; | |
824 | rpc_authflavor_t authflavor; | |
825 | ||
826 | server = NFS_SB(sb); | |
827 | sb->s_blocksize_bits = 0; | |
828 | sb->s_blocksize = 0; | |
829 | if (data->bsize) | |
830 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
831 | if (data->rsize) | |
832 | server->rsize = nfs_block_size(data->rsize, NULL); | |
833 | if (data->wsize) | |
834 | server->wsize = nfs_block_size(data->wsize, NULL); | |
835 | server->flags = data->flags & NFS_MOUNT_FLAGMASK; | |
836 | ||
837 | server->acregmin = data->acregmin*HZ; | |
838 | server->acregmax = data->acregmax*HZ; | |
839 | server->acdirmin = data->acdirmin*HZ; | |
840 | server->acdirmax = data->acdirmax*HZ; | |
841 | ||
842 | /* Start lockd here, before we might error out */ | |
843 | if (!(server->flags & NFS_MOUNT_NONLM)) | |
844 | lockd_up(); | |
845 | ||
846 | server->namelen = data->namlen; | |
847 | server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL); | |
848 | if (!server->hostname) | |
849 | return -ENOMEM; | |
850 | strcpy(server->hostname, data->hostname); | |
851 | ||
852 | /* Check NFS protocol revision and initialize RPC op vector | |
853 | * and file handle pool. */ | |
854 | #ifdef CONFIG_NFS_V3 | |
855 | if (server->flags & NFS_MOUNT_VER3) { | |
856 | server->rpc_ops = &nfs_v3_clientops; | |
857 | server->caps |= NFS_CAP_READDIRPLUS; | |
858 | } else { | |
859 | server->rpc_ops = &nfs_v2_clientops; | |
860 | } | |
861 | #else | |
862 | server->rpc_ops = &nfs_v2_clientops; | |
863 | #endif | |
864 | ||
865 | /* Fill in pseudoflavor for mount version < 5 */ | |
866 | if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) | |
867 | data->pseudoflavor = RPC_AUTH_UNIX; | |
868 | authflavor = data->pseudoflavor; /* save for sb_init() */ | |
869 | /* XXX maybe we want to add a server->pseudoflavor field */ | |
870 | ||
871 | /* Create RPC client handles */ | |
872 | server->client = nfs_create_client(server, data); | |
873 | if (IS_ERR(server->client)) | |
874 | return PTR_ERR(server->client); | |
875 | /* RFC 2623, sec 2.3.2 */ | |
876 | if (authflavor != RPC_AUTH_UNIX) { | |
877 | struct rpc_auth *auth; | |
878 | ||
879 | server->client_sys = rpc_clone_client(server->client); | |
880 | if (IS_ERR(server->client_sys)) | |
881 | return PTR_ERR(server->client_sys); | |
882 | auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys); | |
883 | if (IS_ERR(auth)) | |
884 | return PTR_ERR(auth); | |
885 | } else { | |
886 | atomic_inc(&server->client->cl_count); | |
887 | server->client_sys = server->client; | |
888 | } | |
889 | if (server->flags & NFS_MOUNT_VER3) { | |
890 | #ifdef CONFIG_NFS_V3_ACL | |
891 | if (!(server->flags & NFS_MOUNT_NOACL)) { | |
892 | server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); | |
893 | /* No errors! Assume that Sun nfsacls are supported */ | |
894 | if (!IS_ERR(server->client_acl)) | |
895 | server->caps |= NFS_CAP_ACLS; | |
896 | } | |
897 | #else | |
898 | server->flags &= ~NFS_MOUNT_NOACL; | |
899 | #endif /* CONFIG_NFS_V3_ACL */ | |
900 | /* | |
901 | * The VFS shouldn't apply the umask to mode bits. We will | |
902 | * do so ourselves when necessary. | |
903 | */ | |
904 | sb->s_flags |= MS_POSIXACL; | |
905 | if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) | |
906 | server->namelen = NFS3_MAXNAMLEN; | |
907 | sb->s_time_gran = 1; | |
908 | } else { | |
909 | if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) | |
910 | server->namelen = NFS2_MAXNAMLEN; | |
911 | } | |
912 | ||
913 | sb->s_op = &nfs_sops; | |
914 | return nfs_sb_init(sb, authflavor); | |
915 | } | |
916 | ||
917 | static int nfs_set_super(struct super_block *s, void *data) | |
918 | { | |
919 | s->s_fs_info = data; | |
920 | return set_anon_super(s, data); | |
921 | } | |
922 | ||
923 | static int nfs_compare_super(struct super_block *sb, void *data) | |
924 | { | |
925 | struct nfs_server *server = data; | |
926 | struct nfs_server *old = NFS_SB(sb); | |
927 | ||
928 | if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr) | |
929 | return 0; | |
930 | if (old->addr.sin_port != server->addr.sin_port) | |
931 | return 0; | |
932 | return !nfs_compare_fh(&old->fh, &server->fh); | |
933 | } | |
934 | ||
816724e6 TM |
935 | static int nfs_get_sb(struct file_system_type *fs_type, |
936 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
937 | { |
938 | int error; | |
939 | struct nfs_server *server = NULL; | |
940 | struct super_block *s; | |
941 | struct nfs_fh *root; | |
942 | struct nfs_mount_data *data = raw_data; | |
943 | ||
816724e6 | 944 | error = -EINVAL; |
f7b422b1 DH |
945 | if (data == NULL) { |
946 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
816724e6 | 947 | goto out_err_noserver; |
f7b422b1 DH |
948 | } |
949 | if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { | |
950 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
816724e6 | 951 | goto out_err_noserver; |
f7b422b1 DH |
952 | } |
953 | switch (data->version) { | |
954 | case 1: | |
955 | data->namlen = 0; | |
956 | case 2: | |
957 | data->bsize = 0; | |
958 | case 3: | |
959 | if (data->flags & NFS_MOUNT_VER3) { | |
960 | dprintk("%s: mount structure version %d does not support NFSv3\n", | |
961 | __FUNCTION__, | |
962 | data->version); | |
816724e6 | 963 | goto out_err_noserver; |
f7b422b1 DH |
964 | } |
965 | data->root.size = NFS2_FHSIZE; | |
966 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
967 | case 4: | |
968 | if (data->flags & NFS_MOUNT_SECFLAVOUR) { | |
969 | dprintk("%s: mount structure version %d does not support strong security\n", | |
970 | __FUNCTION__, | |
971 | data->version); | |
816724e6 | 972 | goto out_err_noserver; |
f7b422b1 DH |
973 | } |
974 | case 5: | |
975 | memset(data->context, 0, sizeof(data->context)); | |
976 | } | |
977 | #ifndef CONFIG_NFS_V3 | |
978 | /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ | |
816724e6 | 979 | error = -EPROTONOSUPPORT; |
f7b422b1 DH |
980 | if (data->flags & NFS_MOUNT_VER3) { |
981 | dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); | |
816724e6 | 982 | goto out_err_noserver; |
f7b422b1 DH |
983 | } |
984 | #endif /* CONFIG_NFS_V3 */ | |
985 | ||
816724e6 | 986 | error = -ENOMEM; |
f7b422b1 DH |
987 | server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); |
988 | if (!server) | |
816724e6 | 989 | goto out_err_noserver; |
f7b422b1 DH |
990 | /* Zero out the NFS state stuff */ |
991 | init_nfsv4_state(server); | |
992 | server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); | |
993 | ||
994 | root = &server->fh; | |
995 | if (data->flags & NFS_MOUNT_VER3) | |
996 | root->size = data->root.size; | |
997 | else | |
998 | root->size = NFS2_FHSIZE; | |
816724e6 | 999 | error = -EINVAL; |
f7b422b1 DH |
1000 | if (root->size > sizeof(root->data)) { |
1001 | dprintk("%s: invalid root filehandle\n", __FUNCTION__); | |
1002 | goto out_err; | |
1003 | } | |
1004 | memcpy(root->data, data->root.data, root->size); | |
1005 | ||
1006 | /* We now require that the mount process passes the remote address */ | |
1007 | memcpy(&server->addr, &data->addr, sizeof(server->addr)); | |
1008 | if (server->addr.sin_addr.s_addr == INADDR_ANY) { | |
1009 | dprintk("%s: mount program didn't pass remote address!\n", | |
1010 | __FUNCTION__); | |
1011 | goto out_err; | |
1012 | } | |
1013 | ||
1014 | /* Fire up rpciod if not yet running */ | |
816724e6 TM |
1015 | error = rpciod_up(); |
1016 | if (error < 0) { | |
1017 | dprintk("%s: couldn't start rpciod! Error = %d\n", | |
1018 | __FUNCTION__, error); | |
f7b422b1 DH |
1019 | goto out_err; |
1020 | } | |
1021 | ||
1022 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); | |
816724e6 TM |
1023 | if (IS_ERR(s)) { |
1024 | error = PTR_ERR(s); | |
1025 | goto out_err_rpciod; | |
1026 | } | |
1027 | ||
1028 | if (s->s_root) | |
f7b422b1 DH |
1029 | goto out_rpciod_down; |
1030 | ||
1031 | s->s_flags = flags; | |
1032 | ||
1033 | error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); | |
1034 | if (error) { | |
1035 | up_write(&s->s_umount); | |
1036 | deactivate_super(s); | |
816724e6 | 1037 | return error; |
f7b422b1 DH |
1038 | } |
1039 | s->s_flags |= MS_ACTIVE; | |
816724e6 TM |
1040 | return simple_set_mnt(mnt, s); |
1041 | ||
f7b422b1 DH |
1042 | out_rpciod_down: |
1043 | rpciod_down(); | |
816724e6 TM |
1044 | kfree(server); |
1045 | return simple_set_mnt(mnt, s); | |
1046 | ||
1047 | out_err_rpciod: | |
1048 | rpciod_down(); | |
f7b422b1 DH |
1049 | out_err: |
1050 | kfree(server); | |
816724e6 TM |
1051 | out_err_noserver: |
1052 | return error; | |
f7b422b1 DH |
1053 | } |
1054 | ||
1055 | static void nfs_kill_super(struct super_block *s) | |
1056 | { | |
1057 | struct nfs_server *server = NFS_SB(s); | |
1058 | ||
1059 | kill_anon_super(s); | |
1060 | ||
1061 | if (!IS_ERR(server->client)) | |
1062 | rpc_shutdown_client(server->client); | |
1063 | if (!IS_ERR(server->client_sys)) | |
1064 | rpc_shutdown_client(server->client_sys); | |
1065 | if (!IS_ERR(server->client_acl)) | |
1066 | rpc_shutdown_client(server->client_acl); | |
1067 | ||
1068 | if (!(server->flags & NFS_MOUNT_NONLM)) | |
1069 | lockd_down(); /* release rpc.lockd */ | |
1070 | ||
1071 | rpciod_down(); /* release rpciod */ | |
1072 | ||
1073 | nfs_free_iostats(server->io_stats); | |
1074 | kfree(server->hostname); | |
1075 | kfree(server); | |
1076 | nfs_release_automount_timer(); | |
1077 | } | |
1078 | ||
1079 | static struct super_block *nfs_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data) | |
1080 | { | |
1081 | struct super_block *sb; | |
1082 | ||
1083 | server->fsid = data->fattr->fsid; | |
1084 | nfs_copy_fh(&server->fh, data->fh); | |
1085 | sb = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
1086 | if (!IS_ERR(sb) && sb->s_root == NULL && !(server->flags & NFS_MOUNT_NONLM)) | |
1087 | lockd_up(); | |
1088 | return sb; | |
1089 | } | |
1090 | ||
816724e6 TM |
1091 | static int nfs_clone_nfs_sb(struct file_system_type *fs_type, |
1092 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
1093 | { |
1094 | struct nfs_clone_mount *data = raw_data; | |
816724e6 | 1095 | return nfs_clone_generic_sb(data, nfs_clone_sb, nfs_clone_server, mnt); |
f7b422b1 DH |
1096 | } |
1097 | ||
1098 | #ifdef CONFIG_NFS_V4 | |
1099 | static struct rpc_clnt *nfs4_create_client(struct nfs_server *server, | |
1100 | struct rpc_timeout *timeparms, int proto, rpc_authflavor_t flavor) | |
1101 | { | |
adfa6f98 | 1102 | struct nfs_client *clp; |
f7b422b1 DH |
1103 | struct rpc_xprt *xprt = NULL; |
1104 | struct rpc_clnt *clnt = NULL; | |
1105 | int err = -EIO; | |
1106 | ||
1107 | clp = nfs4_get_client(&server->addr.sin_addr); | |
1108 | if (!clp) { | |
1109 | dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__); | |
1110 | return ERR_PTR(err); | |
1111 | } | |
1112 | ||
1113 | /* Now create transport and client */ | |
1114 | down_write(&clp->cl_sem); | |
1115 | if (IS_ERR(clp->cl_rpcclient)) { | |
1116 | xprt = xprt_create_proto(proto, &server->addr, timeparms); | |
1117 | if (IS_ERR(xprt)) { | |
1118 | up_write(&clp->cl_sem); | |
1119 | err = PTR_ERR(xprt); | |
1120 | dprintk("%s: cannot create RPC transport. Error = %d\n", | |
1121 | __FUNCTION__, err); | |
1122 | goto out_fail; | |
1123 | } | |
1124 | /* Bind to a reserved port! */ | |
1125 | xprt->resvport = 1; | |
1126 | clnt = rpc_create_client(xprt, server->hostname, &nfs_program, | |
1127 | server->rpc_ops->version, flavor); | |
1128 | if (IS_ERR(clnt)) { | |
1129 | up_write(&clp->cl_sem); | |
1130 | err = PTR_ERR(clnt); | |
1131 | dprintk("%s: cannot create RPC client. Error = %d\n", | |
1132 | __FUNCTION__, err); | |
1133 | goto out_fail; | |
1134 | } | |
1135 | clnt->cl_intr = 1; | |
1136 | clnt->cl_softrtry = 1; | |
1137 | clp->cl_rpcclient = clnt; | |
1138 | memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); | |
1139 | nfs_idmap_new(clp); | |
1140 | } | |
1141 | list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); | |
1142 | clnt = rpc_clone_client(clp->cl_rpcclient); | |
1143 | if (!IS_ERR(clnt)) | |
7539bbab | 1144 | server->nfs_client = clp; |
f7b422b1 DH |
1145 | up_write(&clp->cl_sem); |
1146 | clp = NULL; | |
1147 | ||
1148 | if (IS_ERR(clnt)) { | |
1149 | dprintk("%s: cannot create RPC client. Error = %d\n", | |
1150 | __FUNCTION__, err); | |
1151 | return clnt; | |
1152 | } | |
1153 | ||
7539bbab | 1154 | if (server->nfs_client->cl_idmap == NULL) { |
f7b422b1 DH |
1155 | dprintk("%s: failed to create idmapper.\n", __FUNCTION__); |
1156 | return ERR_PTR(-ENOMEM); | |
1157 | } | |
1158 | ||
1159 | if (clnt->cl_auth->au_flavor != flavor) { | |
1160 | struct rpc_auth *auth; | |
1161 | ||
1162 | auth = rpcauth_create(flavor, clnt); | |
1163 | if (IS_ERR(auth)) { | |
1164 | dprintk("%s: couldn't create credcache!\n", __FUNCTION__); | |
1165 | return (struct rpc_clnt *)auth; | |
1166 | } | |
1167 | } | |
1168 | return clnt; | |
1169 | ||
1170 | out_fail: | |
1171 | if (clp) | |
1172 | nfs4_put_client(clp); | |
1173 | return ERR_PTR(err); | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Set up an NFS4 superblock | |
1178 | */ | |
1179 | static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent) | |
1180 | { | |
1181 | struct nfs_server *server; | |
1182 | struct rpc_timeout timeparms; | |
1183 | rpc_authflavor_t authflavour; | |
1184 | int err = -EIO; | |
1185 | ||
1186 | sb->s_blocksize_bits = 0; | |
1187 | sb->s_blocksize = 0; | |
1188 | server = NFS_SB(sb); | |
1189 | if (data->rsize != 0) | |
1190 | server->rsize = nfs_block_size(data->rsize, NULL); | |
1191 | if (data->wsize != 0) | |
1192 | server->wsize = nfs_block_size(data->wsize, NULL); | |
1193 | server->flags = data->flags & NFS_MOUNT_FLAGMASK; | |
1194 | server->caps = NFS_CAP_ATOMIC_OPEN; | |
1195 | ||
1196 | server->acregmin = data->acregmin*HZ; | |
1197 | server->acregmax = data->acregmax*HZ; | |
1198 | server->acdirmin = data->acdirmin*HZ; | |
1199 | server->acdirmax = data->acdirmax*HZ; | |
1200 | ||
1201 | server->rpc_ops = &nfs_v4_clientops; | |
1202 | ||
1203 | nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans); | |
1204 | ||
1205 | server->retrans_timeo = timeparms.to_initval; | |
1206 | server->retrans_count = timeparms.to_retries; | |
1207 | ||
1208 | /* Now create transport and client */ | |
1209 | authflavour = RPC_AUTH_UNIX; | |
1210 | if (data->auth_flavourlen != 0) { | |
1211 | if (data->auth_flavourlen != 1) { | |
1212 | dprintk("%s: Invalid number of RPC auth flavours %d.\n", | |
1213 | __FUNCTION__, data->auth_flavourlen); | |
1214 | err = -EINVAL; | |
1215 | goto out_fail; | |
1216 | } | |
1217 | if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) { | |
1218 | err = -EFAULT; | |
1219 | goto out_fail; | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | server->client = nfs4_create_client(server, &timeparms, data->proto, authflavour); | |
1224 | if (IS_ERR(server->client)) { | |
1225 | err = PTR_ERR(server->client); | |
1226 | dprintk("%s: cannot create RPC client. Error = %d\n", | |
1227 | __FUNCTION__, err); | |
1228 | goto out_fail; | |
1229 | } | |
1230 | ||
1231 | sb->s_time_gran = 1; | |
1232 | ||
1233 | sb->s_op = &nfs4_sops; | |
1234 | err = nfs_sb_init(sb, authflavour); | |
1235 | ||
1236 | out_fail: | |
1237 | return err; | |
1238 | } | |
1239 | ||
1240 | static int nfs4_compare_super(struct super_block *sb, void *data) | |
1241 | { | |
1242 | struct nfs_server *server = data; | |
1243 | struct nfs_server *old = NFS_SB(sb); | |
1244 | ||
1245 | if (strcmp(server->hostname, old->hostname) != 0) | |
1246 | return 0; | |
1247 | if (strcmp(server->mnt_path, old->mnt_path) != 0) | |
1248 | return 0; | |
1249 | return 1; | |
1250 | } | |
1251 | ||
1252 | static void * | |
1253 | nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) | |
1254 | { | |
1255 | void *p = NULL; | |
1256 | ||
1257 | if (!src->len) | |
1258 | return ERR_PTR(-EINVAL); | |
1259 | if (src->len < maxlen) | |
1260 | maxlen = src->len; | |
1261 | if (dst == NULL) { | |
1262 | p = dst = kmalloc(maxlen + 1, GFP_KERNEL); | |
1263 | if (p == NULL) | |
1264 | return ERR_PTR(-ENOMEM); | |
1265 | } | |
1266 | if (copy_from_user(dst, src->data, maxlen)) { | |
1267 | kfree(p); | |
1268 | return ERR_PTR(-EFAULT); | |
1269 | } | |
1270 | dst[maxlen] = '\0'; | |
1271 | return dst; | |
1272 | } | |
1273 | ||
816724e6 TM |
1274 | static int nfs4_get_sb(struct file_system_type *fs_type, |
1275 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
1276 | { |
1277 | int error; | |
1278 | struct nfs_server *server; | |
1279 | struct super_block *s; | |
1280 | struct nfs4_mount_data *data = raw_data; | |
1281 | void *p; | |
1282 | ||
1283 | if (data == NULL) { | |
1284 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
816724e6 | 1285 | return -EINVAL; |
f7b422b1 DH |
1286 | } |
1287 | if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { | |
1288 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
816724e6 | 1289 | return -EINVAL; |
f7b422b1 DH |
1290 | } |
1291 | ||
1292 | server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); | |
1293 | if (!server) | |
816724e6 | 1294 | return -ENOMEM; |
f7b422b1 DH |
1295 | /* Zero out the NFS state stuff */ |
1296 | init_nfsv4_state(server); | |
1297 | server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); | |
1298 | ||
1299 | p = nfs_copy_user_string(NULL, &data->hostname, 256); | |
1300 | if (IS_ERR(p)) | |
1301 | goto out_err; | |
1302 | server->hostname = p; | |
1303 | ||
1304 | p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); | |
1305 | if (IS_ERR(p)) | |
1306 | goto out_err; | |
1307 | server->mnt_path = p; | |
1308 | ||
1309 | p = nfs_copy_user_string(server->ip_addr, &data->client_addr, | |
1310 | sizeof(server->ip_addr) - 1); | |
1311 | if (IS_ERR(p)) | |
1312 | goto out_err; | |
1313 | ||
1314 | /* We now require that the mount process passes the remote address */ | |
1315 | if (data->host_addrlen != sizeof(server->addr)) { | |
816724e6 | 1316 | error = -EINVAL; |
f7b422b1 DH |
1317 | goto out_free; |
1318 | } | |
1319 | if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) { | |
816724e6 | 1320 | error = -EFAULT; |
f7b422b1 DH |
1321 | goto out_free; |
1322 | } | |
1323 | if (server->addr.sin_family != AF_INET || | |
1324 | server->addr.sin_addr.s_addr == INADDR_ANY) { | |
1325 | dprintk("%s: mount program didn't pass remote IP address!\n", | |
1326 | __FUNCTION__); | |
816724e6 | 1327 | error = -EINVAL; |
f7b422b1 DH |
1328 | goto out_free; |
1329 | } | |
1330 | ||
1331 | /* Fire up rpciod if not yet running */ | |
816724e6 TM |
1332 | error = rpciod_up(); |
1333 | if (error < 0) { | |
1334 | dprintk("%s: couldn't start rpciod! Error = %d\n", | |
1335 | __FUNCTION__, error); | |
f7b422b1 DH |
1336 | goto out_free; |
1337 | } | |
1338 | ||
1339 | s = sget(fs_type, nfs4_compare_super, nfs_set_super, server); | |
816724e6 TM |
1340 | if (IS_ERR(s)) { |
1341 | error = PTR_ERR(s); | |
f7b422b1 | 1342 | goto out_free; |
816724e6 TM |
1343 | } |
1344 | ||
1345 | if (s->s_root) { | |
1346 | kfree(server->mnt_path); | |
1347 | kfree(server->hostname); | |
1348 | kfree(server); | |
1349 | return simple_set_mnt(mnt, s); | |
1350 | } | |
f7b422b1 DH |
1351 | |
1352 | s->s_flags = flags; | |
1353 | ||
1354 | error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0); | |
1355 | if (error) { | |
1356 | up_write(&s->s_umount); | |
1357 | deactivate_super(s); | |
816724e6 | 1358 | return error; |
f7b422b1 DH |
1359 | } |
1360 | s->s_flags |= MS_ACTIVE; | |
816724e6 | 1361 | return simple_set_mnt(mnt, s); |
f7b422b1 | 1362 | out_err: |
816724e6 | 1363 | error = PTR_ERR(p); |
f7b422b1 DH |
1364 | out_free: |
1365 | kfree(server->mnt_path); | |
1366 | kfree(server->hostname); | |
1367 | kfree(server); | |
816724e6 | 1368 | return error; |
f7b422b1 DH |
1369 | } |
1370 | ||
1371 | static void nfs4_kill_super(struct super_block *sb) | |
1372 | { | |
1373 | struct nfs_server *server = NFS_SB(sb); | |
1374 | ||
1375 | nfs_return_all_delegations(sb); | |
1376 | kill_anon_super(sb); | |
1377 | ||
1378 | nfs4_renewd_prepare_shutdown(server); | |
1379 | ||
1380 | if (server->client != NULL && !IS_ERR(server->client)) | |
1381 | rpc_shutdown_client(server->client); | |
1382 | ||
1383 | destroy_nfsv4_state(server); | |
1384 | ||
1385 | rpciod_down(); | |
1386 | ||
1387 | nfs_free_iostats(server->io_stats); | |
1388 | kfree(server->hostname); | |
1389 | kfree(server); | |
1390 | nfs_release_automount_timer(); | |
1391 | } | |
1392 | ||
1393 | /* | |
1394 | * Constructs the SERVER-side path | |
1395 | */ | |
1396 | static inline char *nfs4_dup_path(const struct dentry *dentry) | |
1397 | { | |
1398 | char *page = (char *) __get_free_page(GFP_USER); | |
1399 | char *path; | |
1400 | ||
1401 | path = nfs4_path(dentry, page, PAGE_SIZE); | |
1402 | if (!IS_ERR(path)) { | |
1403 | int len = PAGE_SIZE + page - path; | |
1404 | char *tmp = path; | |
1405 | ||
1406 | path = kmalloc(len, GFP_KERNEL); | |
1407 | if (path) | |
1408 | memcpy(path, tmp, len); | |
1409 | else | |
1410 | path = ERR_PTR(-ENOMEM); | |
1411 | } | |
1412 | free_page((unsigned long)page); | |
1413 | return path; | |
1414 | } | |
1415 | ||
1416 | static struct super_block *nfs4_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data) | |
1417 | { | |
1418 | const struct dentry *dentry = data->dentry; | |
7539bbab | 1419 | struct nfs_client *clp = server->nfs_client; |
f7b422b1 DH |
1420 | struct super_block *sb; |
1421 | ||
1422 | server->fsid = data->fattr->fsid; | |
1423 | nfs_copy_fh(&server->fh, data->fh); | |
1424 | server->mnt_path = nfs4_dup_path(dentry); | |
1425 | if (IS_ERR(server->mnt_path)) { | |
1426 | sb = (struct super_block *)server->mnt_path; | |
1427 | goto err; | |
1428 | } | |
1429 | sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server); | |
1430 | if (IS_ERR(sb) || sb->s_root) | |
1431 | goto free_path; | |
1432 | nfs4_server_capabilities(server, &server->fh); | |
1433 | ||
1434 | down_write(&clp->cl_sem); | |
1435 | atomic_inc(&clp->cl_count); | |
1436 | list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); | |
1437 | up_write(&clp->cl_sem); | |
1438 | return sb; | |
1439 | free_path: | |
1440 | kfree(server->mnt_path); | |
1441 | err: | |
1442 | server->mnt_path = NULL; | |
1443 | return sb; | |
1444 | } | |
1445 | ||
816724e6 TM |
1446 | static int nfs_clone_nfs4_sb(struct file_system_type *fs_type, |
1447 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
1448 | { |
1449 | struct nfs_clone_mount *data = raw_data; | |
816724e6 | 1450 | return nfs_clone_generic_sb(data, nfs4_clone_sb, nfs_clone_server, mnt); |
f7b422b1 DH |
1451 | } |
1452 | ||
1453 | static struct super_block *nfs4_referral_sb(struct nfs_server *server, struct nfs_clone_mount *data) | |
1454 | { | |
1455 | struct super_block *sb = ERR_PTR(-ENOMEM); | |
1456 | int len; | |
1457 | ||
1458 | len = strlen(data->mnt_path) + 1; | |
1459 | server->mnt_path = kmalloc(len, GFP_KERNEL); | |
1460 | if (server->mnt_path == NULL) | |
1461 | goto err; | |
1462 | memcpy(server->mnt_path, data->mnt_path, len); | |
1463 | memcpy(&server->addr, data->addr, sizeof(struct sockaddr_in)); | |
1464 | ||
1465 | sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server); | |
1466 | if (IS_ERR(sb) || sb->s_root) | |
1467 | goto free_path; | |
1468 | return sb; | |
1469 | free_path: | |
1470 | kfree(server->mnt_path); | |
1471 | err: | |
1472 | server->mnt_path = NULL; | |
1473 | return sb; | |
1474 | } | |
1475 | ||
1476 | static struct nfs_server *nfs4_referral_server(struct super_block *sb, struct nfs_clone_mount *data) | |
1477 | { | |
1478 | struct nfs_server *server = NFS_SB(sb); | |
1479 | struct rpc_timeout timeparms; | |
1480 | int proto, timeo, retrans; | |
1481 | void *err; | |
1482 | ||
1483 | proto = IPPROTO_TCP; | |
1484 | /* Since we are following a referral and there may be alternatives, | |
1485 | set the timeouts and retries to low values */ | |
1486 | timeo = 2; | |
1487 | retrans = 1; | |
1488 | nfs_init_timeout_values(&timeparms, proto, timeo, retrans); | |
1489 | ||
1490 | server->client = nfs4_create_client(server, &timeparms, proto, data->authflavor); | |
1491 | if (IS_ERR((err = server->client))) | |
1492 | goto out_err; | |
1493 | ||
1494 | sb->s_time_gran = 1; | |
1495 | sb->s_op = &nfs4_sops; | |
1496 | err = ERR_PTR(nfs_sb_init(sb, data->authflavor)); | |
1497 | if (!IS_ERR(err)) | |
1498 | return server; | |
1499 | out_err: | |
1500 | return (struct nfs_server *)err; | |
1501 | } | |
1502 | ||
816724e6 TM |
1503 | static int nfs_referral_nfs4_sb(struct file_system_type *fs_type, |
1504 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
1505 | { |
1506 | struct nfs_clone_mount *data = raw_data; | |
816724e6 | 1507 | return nfs_clone_generic_sb(data, nfs4_referral_sb, nfs4_referral_server, mnt); |
f7b422b1 DH |
1508 | } |
1509 | ||
1510 | #endif |