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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 | ||
6ab86aa1 | 190 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
191 | static const int nfs_set_port_min = 0; |
192 | static const int nfs_set_port_max = 65535; | |
193 | ||
194 | static int param_set_port(const char *val, struct kernel_param *kp) | |
195 | { | |
196 | char *endp; | |
197 | int num = simple_strtol(val, &endp, 0); | |
198 | if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max) | |
199 | return -EINVAL; | |
200 | *((int *)kp->arg) = num; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | module_param_call(callback_tcpport, param_set_port, param_get_int, | |
205 | &nfs_callback_set_tcpport, 0644); | |
6ab86aa1 | 206 | #endif |
f7b422b1 | 207 | |
6ab86aa1 | 208 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
209 | static int param_set_idmap_timeout(const char *val, struct kernel_param *kp) |
210 | { | |
211 | char *endp; | |
212 | int num = simple_strtol(val, &endp, 0); | |
213 | int jif = num * HZ; | |
214 | if (endp == val || *endp || num < 0 || jif < num) | |
215 | return -EINVAL; | |
216 | *((int *)kp->arg) = jif; | |
217 | return 0; | |
218 | } | |
219 | ||
220 | module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int, | |
221 | &nfs_idmap_cache_timeout, 0644); | |
6ab86aa1 | 222 | #endif |
f7b422b1 | 223 | |
979df72e TM |
224 | static struct shrinker *acl_shrinker; |
225 | ||
f7b422b1 DH |
226 | /* |
227 | * Register the NFS filesystems | |
228 | */ | |
229 | int __init register_nfs_fs(void) | |
230 | { | |
231 | int ret; | |
232 | ||
233 | ret = register_filesystem(&nfs_fs_type); | |
234 | if (ret < 0) | |
235 | goto error_0; | |
236 | ||
237 | #ifdef CONFIG_NFS_V4 | |
238 | ret = nfs_register_sysctl(); | |
239 | if (ret < 0) | |
240 | goto error_1; | |
241 | ret = register_filesystem(&nfs4_fs_type); | |
242 | if (ret < 0) | |
243 | goto error_2; | |
244 | #endif | |
979df72e | 245 | acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker); |
f7b422b1 DH |
246 | return 0; |
247 | ||
248 | #ifdef CONFIG_NFS_V4 | |
249 | error_2: | |
250 | nfs_unregister_sysctl(); | |
251 | error_1: | |
252 | unregister_filesystem(&nfs_fs_type); | |
253 | #endif | |
254 | error_0: | |
255 | return ret; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Unregister the NFS filesystems | |
260 | */ | |
261 | void __exit unregister_nfs_fs(void) | |
262 | { | |
979df72e TM |
263 | if (acl_shrinker != NULL) |
264 | remove_shrinker(acl_shrinker); | |
f7b422b1 DH |
265 | #ifdef CONFIG_NFS_V4 |
266 | unregister_filesystem(&nfs4_fs_type); | |
267 | nfs_unregister_sysctl(); | |
268 | #endif | |
269 | unregister_filesystem(&nfs_fs_type); | |
270 | } | |
271 | ||
272 | /* | |
273 | * Deliver file system statistics to userspace | |
274 | */ | |
816724e6 | 275 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 276 | { |
816724e6 | 277 | struct super_block *sb = dentry->d_sb; |
f7b422b1 DH |
278 | struct nfs_server *server = NFS_SB(sb); |
279 | unsigned char blockbits; | |
280 | unsigned long blockres; | |
281 | struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode); | |
282 | struct nfs_fattr fattr; | |
283 | struct nfs_fsstat res = { | |
284 | .fattr = &fattr, | |
285 | }; | |
286 | int error; | |
287 | ||
288 | lock_kernel(); | |
289 | ||
290 | error = server->rpc_ops->statfs(server, rootfh, &res); | |
291 | buf->f_type = NFS_SUPER_MAGIC; | |
292 | if (error < 0) | |
293 | goto out_err; | |
294 | ||
295 | /* | |
296 | * Current versions of glibc do not correctly handle the | |
297 | * case where f_frsize != f_bsize. Eventually we want to | |
298 | * report the value of wtmult in this field. | |
299 | */ | |
300 | buf->f_frsize = sb->s_blocksize; | |
301 | ||
302 | /* | |
303 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
304 | * are reported in units of f_frsize. Linux hasn't had | |
305 | * an f_frsize field in its statfs struct until recently, | |
306 | * thus historically Linux's sys_statfs reports these | |
307 | * fields in units of f_bsize. | |
308 | */ | |
309 | buf->f_bsize = sb->s_blocksize; | |
310 | blockbits = sb->s_blocksize_bits; | |
311 | blockres = (1 << blockbits) - 1; | |
312 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
313 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
314 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
315 | ||
316 | buf->f_files = res.tfiles; | |
317 | buf->f_ffree = res.afiles; | |
318 | ||
319 | buf->f_namelen = server->namelen; | |
320 | out: | |
321 | unlock_kernel(); | |
322 | return 0; | |
323 | ||
324 | out_err: | |
325 | dprintk("%s: statfs error = %d\n", __FUNCTION__, -error); | |
326 | buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; | |
327 | goto out; | |
328 | ||
329 | } | |
330 | ||
81039f1f TM |
331 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
332 | { | |
333 | static struct { | |
334 | rpc_authflavor_t flavour; | |
335 | const char *str; | |
336 | } sec_flavours[] = { | |
337 | { RPC_AUTH_NULL, "null" }, | |
338 | { RPC_AUTH_UNIX, "sys" }, | |
339 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
340 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
341 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
342 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
343 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
344 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
345 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
346 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
347 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
348 | { -1, "unknown" } | |
349 | }; | |
350 | int i; | |
351 | ||
352 | for (i=0; sec_flavours[i].flavour != -1; i++) { | |
353 | if (sec_flavours[i].flavour == flavour) | |
354 | break; | |
355 | } | |
356 | return sec_flavours[i].str; | |
357 | } | |
358 | ||
f7b422b1 DH |
359 | /* |
360 | * Describe the mount options in force on this server representation | |
361 | */ | |
362 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) | |
363 | { | |
364 | static struct proc_nfs_info { | |
365 | int flag; | |
366 | char *str; | |
367 | char *nostr; | |
368 | } nfs_info[] = { | |
369 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
370 | { NFS_MOUNT_INTR, ",intr", "" }, | |
371 | { NFS_MOUNT_NOCTO, ",nocto", "" }, | |
372 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
373 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
374 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
375 | { 0, NULL, NULL } | |
376 | }; | |
377 | struct proc_nfs_info *nfs_infop; | |
378 | char buf[12]; | |
379 | char *proto; | |
380 | ||
381 | seq_printf(m, ",vers=%d", nfss->rpc_ops->version); | |
382 | seq_printf(m, ",rsize=%d", nfss->rsize); | |
383 | seq_printf(m, ",wsize=%d", nfss->wsize); | |
384 | if (nfss->acregmin != 3*HZ || showdefaults) | |
385 | seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); | |
386 | if (nfss->acregmax != 60*HZ || showdefaults) | |
387 | seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); | |
388 | if (nfss->acdirmin != 30*HZ || showdefaults) | |
389 | seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); | |
390 | if (nfss->acdirmax != 60*HZ || showdefaults) | |
391 | seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); | |
392 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { | |
393 | if (nfss->flags & nfs_infop->flag) | |
394 | seq_puts(m, nfs_infop->str); | |
395 | else | |
396 | seq_puts(m, nfs_infop->nostr); | |
397 | } | |
398 | switch (nfss->client->cl_xprt->prot) { | |
399 | case IPPROTO_TCP: | |
400 | proto = "tcp"; | |
401 | break; | |
402 | case IPPROTO_UDP: | |
403 | proto = "udp"; | |
404 | break; | |
405 | default: | |
406 | snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot); | |
407 | proto = buf; | |
408 | } | |
409 | seq_printf(m, ",proto=%s", proto); | |
410 | seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ); | |
411 | seq_printf(m, ",retrans=%u", nfss->retrans_count); | |
81039f1f | 412 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
f7b422b1 DH |
413 | } |
414 | ||
415 | /* | |
416 | * Describe the mount options on this VFS mountpoint | |
417 | */ | |
418 | static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
419 | { | |
420 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
421 | ||
422 | nfs_show_mount_options(m, nfss, 0); | |
423 | ||
424 | seq_puts(m, ",addr="); | |
425 | seq_escape(m, nfss->hostname, " \t\n\\"); | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | /* | |
431 | * Present statistical information for this VFS mountpoint | |
432 | */ | |
433 | static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) | |
434 | { | |
435 | int i, cpu; | |
436 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
437 | struct rpc_auth *auth = nfss->client->cl_auth; | |
438 | struct nfs_iostats totals = { }; | |
439 | ||
440 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
441 | ||
442 | /* | |
443 | * Display all mount option settings | |
444 | */ | |
445 | seq_printf(m, "\n\topts:\t"); | |
446 | seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); | |
447 | seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
448 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
449 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
450 | nfs_show_mount_options(m, nfss, 1); | |
451 | ||
452 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
453 | ||
454 | seq_printf(m, "\n\tcaps:\t"); | |
455 | seq_printf(m, "caps=0x%x", nfss->caps); | |
456 | seq_printf(m, ",wtmult=%d", nfss->wtmult); | |
457 | seq_printf(m, ",dtsize=%d", nfss->dtsize); | |
458 | seq_printf(m, ",bsize=%d", nfss->bsize); | |
459 | seq_printf(m, ",namelen=%d", nfss->namelen); | |
460 | ||
461 | #ifdef CONFIG_NFS_V4 | |
462 | if (nfss->rpc_ops->version == 4) { | |
463 | seq_printf(m, "\n\tnfsv4:\t"); | |
464 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
465 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
466 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
467 | } | |
468 | #endif | |
469 | ||
470 | /* | |
471 | * Display security flavor in effect for this mount | |
472 | */ | |
473 | seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor); | |
474 | if (auth->au_flavor) | |
475 | seq_printf(m, ",pseudoflavor=%d", auth->au_flavor); | |
476 | ||
477 | /* | |
478 | * Display superblock I/O counters | |
479 | */ | |
480 | for_each_possible_cpu(cpu) { | |
481 | struct nfs_iostats *stats; | |
482 | ||
483 | preempt_disable(); | |
484 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
485 | ||
486 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
487 | totals.events[i] += stats->events[i]; | |
488 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
489 | totals.bytes[i] += stats->bytes[i]; | |
490 | ||
491 | preempt_enable(); | |
492 | } | |
493 | ||
494 | seq_printf(m, "\n\tevents:\t"); | |
495 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
496 | seq_printf(m, "%lu ", totals.events[i]); | |
497 | seq_printf(m, "\n\tbytes:\t"); | |
498 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
499 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
500 | seq_printf(m, "\n"); | |
501 | ||
502 | rpc_print_iostats(m, nfss->client); | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | /* | |
508 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
509 | * in response to traversals | |
510 | */ | |
511 | static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags) | |
512 | { | |
513 | struct nfs_server *server; | |
514 | struct rpc_clnt *rpc; | |
515 | ||
516 | shrink_submounts(vfsmnt, &nfs_automount_list); | |
517 | if (!(flags & MNT_FORCE)) | |
518 | return; | |
519 | /* -EIO all pending I/O */ | |
520 | server = NFS_SB(vfsmnt->mnt_sb); | |
521 | rpc = server->client; | |
522 | if (!IS_ERR(rpc)) | |
523 | rpc_killall_tasks(rpc); | |
524 | rpc = server->client_acl; | |
525 | if (!IS_ERR(rpc)) | |
526 | rpc_killall_tasks(rpc); | |
527 | } | |
528 | ||
529 | /* | |
530 | * Obtain the root inode of the file system. | |
531 | */ | |
532 | static struct inode * | |
533 | nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo) | |
534 | { | |
535 | struct nfs_server *server = NFS_SB(sb); | |
536 | int error; | |
537 | ||
538 | error = server->rpc_ops->getroot(server, rootfh, fsinfo); | |
539 | if (error < 0) { | |
540 | dprintk("nfs_get_root: getattr error = %d\n", -error); | |
541 | return ERR_PTR(error); | |
542 | } | |
543 | ||
544 | server->fsid = fsinfo->fattr->fsid; | |
545 | return nfs_fhget(sb, rootfh, fsinfo->fattr); | |
546 | } | |
547 | ||
548 | /* | |
549 | * Do NFS version-independent mount processing, and sanity checking | |
550 | */ | |
551 | static int | |
552 | nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor) | |
553 | { | |
554 | struct nfs_server *server; | |
555 | struct inode *root_inode; | |
556 | struct nfs_fattr fattr; | |
557 | struct nfs_fsinfo fsinfo = { | |
558 | .fattr = &fattr, | |
559 | }; | |
560 | struct nfs_pathconf pathinfo = { | |
561 | .fattr = &fattr, | |
562 | }; | |
563 | int no_root_error = 0; | |
564 | unsigned long max_rpc_payload; | |
565 | ||
566 | /* We probably want something more informative here */ | |
567 | snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
568 | ||
569 | server = NFS_SB(sb); | |
570 | ||
571 | sb->s_magic = NFS_SUPER_MAGIC; | |
572 | ||
573 | server->io_stats = nfs_alloc_iostats(); | |
574 | if (server->io_stats == NULL) | |
575 | return -ENOMEM; | |
576 | ||
577 | root_inode = nfs_get_root(sb, &server->fh, &fsinfo); | |
578 | /* Did getting the root inode fail? */ | |
579 | if (IS_ERR(root_inode)) { | |
580 | no_root_error = PTR_ERR(root_inode); | |
581 | goto out_no_root; | |
582 | } | |
583 | sb->s_root = d_alloc_root(root_inode); | |
584 | if (!sb->s_root) { | |
585 | no_root_error = -ENOMEM; | |
586 | goto out_no_root; | |
587 | } | |
588 | sb->s_root->d_op = server->rpc_ops->dentry_ops; | |
589 | ||
590 | /* mount time stamp, in seconds */ | |
591 | server->mount_time = jiffies; | |
592 | ||
593 | /* Get some general file system info */ | |
594 | if (server->namelen == 0 && | |
595 | server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0) | |
596 | server->namelen = pathinfo.max_namelen; | |
597 | /* Work out a lot of parameters */ | |
598 | if (server->rsize == 0) | |
599 | server->rsize = nfs_block_size(fsinfo.rtpref, NULL); | |
600 | if (server->wsize == 0) | |
601 | server->wsize = nfs_block_size(fsinfo.wtpref, NULL); | |
602 | ||
603 | if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax) | |
604 | server->rsize = nfs_block_size(fsinfo.rtmax, NULL); | |
605 | if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax) | |
606 | server->wsize = nfs_block_size(fsinfo.wtmax, NULL); | |
607 | ||
608 | max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL); | |
609 | if (server->rsize > max_rpc_payload) | |
610 | server->rsize = max_rpc_payload; | |
611 | if (server->rsize > NFS_MAX_FILE_IO_SIZE) | |
612 | server->rsize = NFS_MAX_FILE_IO_SIZE; | |
613 | server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
614 | ||
615 | if (server->wsize > max_rpc_payload) | |
616 | server->wsize = max_rpc_payload; | |
617 | if (server->wsize > NFS_MAX_FILE_IO_SIZE) | |
618 | server->wsize = NFS_MAX_FILE_IO_SIZE; | |
619 | server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
620 | ||
621 | if (sb->s_blocksize == 0) | |
622 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
623 | &sb->s_blocksize_bits); | |
624 | server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL); | |
625 | ||
626 | server->dtsize = nfs_block_size(fsinfo.dtpref, NULL); | |
627 | if (server->dtsize > PAGE_CACHE_SIZE) | |
628 | server->dtsize = PAGE_CACHE_SIZE; | |
629 | if (server->dtsize > server->rsize) | |
630 | server->dtsize = server->rsize; | |
631 | ||
632 | if (server->flags & NFS_MOUNT_NOAC) { | |
633 | server->acregmin = server->acregmax = 0; | |
634 | server->acdirmin = server->acdirmax = 0; | |
635 | sb->s_flags |= MS_SYNCHRONOUS; | |
636 | } | |
637 | server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD; | |
638 | ||
639 | nfs_super_set_maxbytes(sb, fsinfo.maxfilesize); | |
640 | ||
641 | server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0; | |
642 | server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0; | |
643 | ||
644 | /* We're airborne Set socket buffersize */ | |
645 | rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100); | |
646 | return 0; | |
647 | /* Yargs. It didn't work out. */ | |
648 | out_no_root: | |
649 | dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error); | |
650 | if (!IS_ERR(root_inode)) | |
651 | iput(root_inode); | |
652 | return no_root_error; | |
653 | } | |
654 | ||
655 | /* | |
656 | * Initialise the timeout values for a connection | |
657 | */ | |
658 | static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans) | |
659 | { | |
660 | to->to_initval = timeo * HZ / 10; | |
661 | to->to_retries = retrans; | |
662 | if (!to->to_retries) | |
663 | to->to_retries = 2; | |
664 | ||
665 | switch (proto) { | |
666 | case IPPROTO_TCP: | |
667 | if (!to->to_initval) | |
668 | to->to_initval = 60 * HZ; | |
669 | if (to->to_initval > NFS_MAX_TCP_TIMEOUT) | |
670 | to->to_initval = NFS_MAX_TCP_TIMEOUT; | |
671 | to->to_increment = to->to_initval; | |
672 | to->to_maxval = to->to_initval + (to->to_increment * to->to_retries); | |
673 | to->to_exponential = 0; | |
674 | break; | |
675 | case IPPROTO_UDP: | |
676 | default: | |
677 | if (!to->to_initval) | |
678 | to->to_initval = 11 * HZ / 10; | |
679 | if (to->to_initval > NFS_MAX_UDP_TIMEOUT) | |
680 | to->to_initval = NFS_MAX_UDP_TIMEOUT; | |
681 | to->to_maxval = NFS_MAX_UDP_TIMEOUT; | |
682 | to->to_exponential = 1; | |
683 | break; | |
684 | } | |
685 | } | |
686 | ||
687 | /* | |
688 | * Create an RPC client handle. | |
689 | */ | |
690 | static struct rpc_clnt * | |
691 | nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data) | |
692 | { | |
693 | struct rpc_timeout timeparms; | |
694 | struct rpc_xprt *xprt = NULL; | |
695 | struct rpc_clnt *clnt = NULL; | |
696 | int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP; | |
697 | ||
698 | nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans); | |
699 | ||
700 | server->retrans_timeo = timeparms.to_initval; | |
701 | server->retrans_count = timeparms.to_retries; | |
702 | ||
703 | /* create transport and client */ | |
704 | xprt = xprt_create_proto(proto, &server->addr, &timeparms); | |
705 | if (IS_ERR(xprt)) { | |
706 | dprintk("%s: cannot create RPC transport. Error = %ld\n", | |
707 | __FUNCTION__, PTR_ERR(xprt)); | |
708 | return (struct rpc_clnt *)xprt; | |
709 | } | |
710 | clnt = rpc_create_client(xprt, server->hostname, &nfs_program, | |
711 | server->rpc_ops->version, data->pseudoflavor); | |
712 | if (IS_ERR(clnt)) { | |
713 | dprintk("%s: cannot create RPC client. Error = %ld\n", | |
714 | __FUNCTION__, PTR_ERR(xprt)); | |
715 | goto out_fail; | |
716 | } | |
717 | ||
718 | clnt->cl_intr = 1; | |
719 | clnt->cl_softrtry = 1; | |
720 | ||
721 | return clnt; | |
722 | ||
723 | out_fail: | |
724 | return clnt; | |
725 | } | |
726 | ||
727 | /* | |
728 | * Clone a server record | |
729 | */ | |
730 | static struct nfs_server *nfs_clone_server(struct super_block *sb, struct nfs_clone_mount *data) | |
731 | { | |
732 | struct nfs_server *server = NFS_SB(sb); | |
733 | struct nfs_server *parent = NFS_SB(data->sb); | |
734 | struct inode *root_inode; | |
735 | struct nfs_fsinfo fsinfo; | |
736 | void *err = ERR_PTR(-ENOMEM); | |
737 | ||
738 | sb->s_op = data->sb->s_op; | |
739 | sb->s_blocksize = data->sb->s_blocksize; | |
740 | sb->s_blocksize_bits = data->sb->s_blocksize_bits; | |
741 | sb->s_maxbytes = data->sb->s_maxbytes; | |
742 | ||
743 | server->client_sys = server->client_acl = ERR_PTR(-EINVAL); | |
744 | server->io_stats = nfs_alloc_iostats(); | |
745 | if (server->io_stats == NULL) | |
746 | goto out; | |
747 | ||
748 | server->client = rpc_clone_client(parent->client); | |
749 | if (IS_ERR((err = server->client))) | |
750 | goto out; | |
751 | ||
752 | if (!IS_ERR(parent->client_sys)) { | |
753 | server->client_sys = rpc_clone_client(parent->client_sys); | |
754 | if (IS_ERR((err = server->client_sys))) | |
755 | goto out; | |
756 | } | |
757 | if (!IS_ERR(parent->client_acl)) { | |
758 | server->client_acl = rpc_clone_client(parent->client_acl); | |
759 | if (IS_ERR((err = server->client_acl))) | |
760 | goto out; | |
761 | } | |
762 | root_inode = nfs_fhget(sb, data->fh, data->fattr); | |
763 | if (!root_inode) | |
764 | goto out; | |
765 | sb->s_root = d_alloc_root(root_inode); | |
766 | if (!sb->s_root) | |
767 | goto out_put_root; | |
768 | fsinfo.fattr = data->fattr; | |
769 | if (NFS_PROTO(root_inode)->fsinfo(server, data->fh, &fsinfo) == 0) | |
770 | nfs_super_set_maxbytes(sb, fsinfo.maxfilesize); | |
771 | sb->s_root->d_op = server->rpc_ops->dentry_ops; | |
772 | sb->s_flags |= MS_ACTIVE; | |
773 | return server; | |
774 | out_put_root: | |
775 | iput(root_inode); | |
776 | out: | |
777 | return err; | |
778 | } | |
779 | ||
780 | /* | |
781 | * Copy an existing superblock and attach revised data | |
782 | */ | |
816724e6 | 783 | static int nfs_clone_generic_sb(struct nfs_clone_mount *data, |
f7b422b1 | 784 | struct super_block *(*fill_sb)(struct nfs_server *, struct nfs_clone_mount *), |
816724e6 TM |
785 | struct nfs_server *(*fill_server)(struct super_block *, struct nfs_clone_mount *), |
786 | struct vfsmount *mnt) | |
f7b422b1 DH |
787 | { |
788 | struct nfs_server *server; | |
789 | struct nfs_server *parent = NFS_SB(data->sb); | |
790 | struct super_block *sb = ERR_PTR(-EINVAL); | |
f7b422b1 | 791 | char *hostname; |
816724e6 | 792 | int error = -ENOMEM; |
f7b422b1 DH |
793 | int len; |
794 | ||
795 | server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL); | |
796 | if (server == NULL) | |
797 | goto out_err; | |
798 | memcpy(server, parent, sizeof(*server)); | |
799 | hostname = (data->hostname != NULL) ? data->hostname : parent->hostname; | |
800 | len = strlen(hostname) + 1; | |
801 | server->hostname = kmalloc(len, GFP_KERNEL); | |
802 | if (server->hostname == NULL) | |
803 | goto free_server; | |
804 | memcpy(server->hostname, hostname, len); | |
816724e6 TM |
805 | error = rpciod_up(); |
806 | if (error != 0) | |
f7b422b1 DH |
807 | goto free_hostname; |
808 | ||
809 | sb = fill_sb(server, data); | |
816724e6 TM |
810 | if (IS_ERR(sb)) { |
811 | error = PTR_ERR(sb); | |
f7b422b1 | 812 | goto kill_rpciod; |
816724e6 TM |
813 | } |
814 | ||
815 | if (sb->s_root) | |
816 | goto out_rpciod_down; | |
f7b422b1 DH |
817 | |
818 | server = fill_server(sb, data); | |
816724e6 TM |
819 | if (IS_ERR(server)) { |
820 | error = PTR_ERR(server); | |
f7b422b1 | 821 | goto out_deactivate; |
816724e6 TM |
822 | } |
823 | return simple_set_mnt(mnt, sb); | |
f7b422b1 DH |
824 | out_deactivate: |
825 | up_write(&sb->s_umount); | |
826 | deactivate_super(sb); | |
816724e6 TM |
827 | return error; |
828 | out_rpciod_down: | |
829 | rpciod_down(); | |
830 | kfree(server->hostname); | |
831 | kfree(server); | |
832 | return simple_set_mnt(mnt, sb); | |
f7b422b1 DH |
833 | kill_rpciod: |
834 | rpciod_down(); | |
835 | free_hostname: | |
836 | kfree(server->hostname); | |
837 | free_server: | |
838 | kfree(server); | |
839 | out_err: | |
816724e6 | 840 | return error; |
f7b422b1 DH |
841 | } |
842 | ||
843 | /* | |
844 | * Set up an NFS2/3 superblock | |
845 | * | |
846 | * The way this works is that the mount process passes a structure | |
847 | * in the data argument which contains the server's IP address | |
848 | * and the root file handle obtained from the server's mount | |
849 | * daemon. We stash these away in the private superblock fields. | |
850 | */ | |
851 | static int | |
852 | nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent) | |
853 | { | |
854 | struct nfs_server *server; | |
855 | rpc_authflavor_t authflavor; | |
856 | ||
857 | server = NFS_SB(sb); | |
858 | sb->s_blocksize_bits = 0; | |
859 | sb->s_blocksize = 0; | |
860 | if (data->bsize) | |
861 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
862 | if (data->rsize) | |
863 | server->rsize = nfs_block_size(data->rsize, NULL); | |
864 | if (data->wsize) | |
865 | server->wsize = nfs_block_size(data->wsize, NULL); | |
866 | server->flags = data->flags & NFS_MOUNT_FLAGMASK; | |
867 | ||
868 | server->acregmin = data->acregmin*HZ; | |
869 | server->acregmax = data->acregmax*HZ; | |
870 | server->acdirmin = data->acdirmin*HZ; | |
871 | server->acdirmax = data->acdirmax*HZ; | |
872 | ||
873 | /* Start lockd here, before we might error out */ | |
874 | if (!(server->flags & NFS_MOUNT_NONLM)) | |
875 | lockd_up(); | |
876 | ||
877 | server->namelen = data->namlen; | |
878 | server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL); | |
879 | if (!server->hostname) | |
880 | return -ENOMEM; | |
881 | strcpy(server->hostname, data->hostname); | |
882 | ||
883 | /* Check NFS protocol revision and initialize RPC op vector | |
884 | * and file handle pool. */ | |
885 | #ifdef CONFIG_NFS_V3 | |
886 | if (server->flags & NFS_MOUNT_VER3) { | |
887 | server->rpc_ops = &nfs_v3_clientops; | |
888 | server->caps |= NFS_CAP_READDIRPLUS; | |
889 | } else { | |
890 | server->rpc_ops = &nfs_v2_clientops; | |
891 | } | |
892 | #else | |
893 | server->rpc_ops = &nfs_v2_clientops; | |
894 | #endif | |
895 | ||
896 | /* Fill in pseudoflavor for mount version < 5 */ | |
897 | if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) | |
898 | data->pseudoflavor = RPC_AUTH_UNIX; | |
899 | authflavor = data->pseudoflavor; /* save for sb_init() */ | |
900 | /* XXX maybe we want to add a server->pseudoflavor field */ | |
901 | ||
902 | /* Create RPC client handles */ | |
903 | server->client = nfs_create_client(server, data); | |
904 | if (IS_ERR(server->client)) | |
905 | return PTR_ERR(server->client); | |
906 | /* RFC 2623, sec 2.3.2 */ | |
907 | if (authflavor != RPC_AUTH_UNIX) { | |
908 | struct rpc_auth *auth; | |
909 | ||
910 | server->client_sys = rpc_clone_client(server->client); | |
911 | if (IS_ERR(server->client_sys)) | |
912 | return PTR_ERR(server->client_sys); | |
913 | auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys); | |
914 | if (IS_ERR(auth)) | |
915 | return PTR_ERR(auth); | |
916 | } else { | |
917 | atomic_inc(&server->client->cl_count); | |
918 | server->client_sys = server->client; | |
919 | } | |
920 | if (server->flags & NFS_MOUNT_VER3) { | |
921 | #ifdef CONFIG_NFS_V3_ACL | |
922 | if (!(server->flags & NFS_MOUNT_NOACL)) { | |
923 | server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3); | |
924 | /* No errors! Assume that Sun nfsacls are supported */ | |
925 | if (!IS_ERR(server->client_acl)) | |
926 | server->caps |= NFS_CAP_ACLS; | |
927 | } | |
928 | #else | |
929 | server->flags &= ~NFS_MOUNT_NOACL; | |
930 | #endif /* CONFIG_NFS_V3_ACL */ | |
931 | /* | |
932 | * The VFS shouldn't apply the umask to mode bits. We will | |
933 | * do so ourselves when necessary. | |
934 | */ | |
935 | sb->s_flags |= MS_POSIXACL; | |
936 | if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN) | |
937 | server->namelen = NFS3_MAXNAMLEN; | |
938 | sb->s_time_gran = 1; | |
939 | } else { | |
940 | if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN) | |
941 | server->namelen = NFS2_MAXNAMLEN; | |
942 | } | |
943 | ||
944 | sb->s_op = &nfs_sops; | |
945 | return nfs_sb_init(sb, authflavor); | |
946 | } | |
947 | ||
948 | static int nfs_set_super(struct super_block *s, void *data) | |
949 | { | |
950 | s->s_fs_info = data; | |
951 | return set_anon_super(s, data); | |
952 | } | |
953 | ||
954 | static int nfs_compare_super(struct super_block *sb, void *data) | |
955 | { | |
956 | struct nfs_server *server = data; | |
957 | struct nfs_server *old = NFS_SB(sb); | |
958 | ||
959 | if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr) | |
960 | return 0; | |
961 | if (old->addr.sin_port != server->addr.sin_port) | |
962 | return 0; | |
963 | return !nfs_compare_fh(&old->fh, &server->fh); | |
964 | } | |
965 | ||
816724e6 TM |
966 | static int nfs_get_sb(struct file_system_type *fs_type, |
967 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
968 | { |
969 | int error; | |
970 | struct nfs_server *server = NULL; | |
971 | struct super_block *s; | |
972 | struct nfs_fh *root; | |
973 | struct nfs_mount_data *data = raw_data; | |
974 | ||
816724e6 | 975 | error = -EINVAL; |
f7b422b1 DH |
976 | if (data == NULL) { |
977 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
816724e6 | 978 | goto out_err_noserver; |
f7b422b1 DH |
979 | } |
980 | if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { | |
981 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
816724e6 | 982 | goto out_err_noserver; |
f7b422b1 DH |
983 | } |
984 | switch (data->version) { | |
985 | case 1: | |
986 | data->namlen = 0; | |
987 | case 2: | |
988 | data->bsize = 0; | |
989 | case 3: | |
990 | if (data->flags & NFS_MOUNT_VER3) { | |
991 | dprintk("%s: mount structure version %d does not support NFSv3\n", | |
992 | __FUNCTION__, | |
993 | data->version); | |
816724e6 | 994 | goto out_err_noserver; |
f7b422b1 DH |
995 | } |
996 | data->root.size = NFS2_FHSIZE; | |
997 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
998 | case 4: | |
999 | if (data->flags & NFS_MOUNT_SECFLAVOUR) { | |
1000 | dprintk("%s: mount structure version %d does not support strong security\n", | |
1001 | __FUNCTION__, | |
1002 | data->version); | |
816724e6 | 1003 | goto out_err_noserver; |
f7b422b1 DH |
1004 | } |
1005 | case 5: | |
1006 | memset(data->context, 0, sizeof(data->context)); | |
1007 | } | |
1008 | #ifndef CONFIG_NFS_V3 | |
1009 | /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ | |
816724e6 | 1010 | error = -EPROTONOSUPPORT; |
f7b422b1 DH |
1011 | if (data->flags & NFS_MOUNT_VER3) { |
1012 | dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); | |
816724e6 | 1013 | goto out_err_noserver; |
f7b422b1 DH |
1014 | } |
1015 | #endif /* CONFIG_NFS_V3 */ | |
1016 | ||
816724e6 | 1017 | error = -ENOMEM; |
f7b422b1 DH |
1018 | server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); |
1019 | if (!server) | |
816724e6 | 1020 | goto out_err_noserver; |
f7b422b1 DH |
1021 | /* Zero out the NFS state stuff */ |
1022 | init_nfsv4_state(server); | |
1023 | server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); | |
1024 | ||
1025 | root = &server->fh; | |
1026 | if (data->flags & NFS_MOUNT_VER3) | |
1027 | root->size = data->root.size; | |
1028 | else | |
1029 | root->size = NFS2_FHSIZE; | |
816724e6 | 1030 | error = -EINVAL; |
f7b422b1 DH |
1031 | if (root->size > sizeof(root->data)) { |
1032 | dprintk("%s: invalid root filehandle\n", __FUNCTION__); | |
1033 | goto out_err; | |
1034 | } | |
1035 | memcpy(root->data, data->root.data, root->size); | |
1036 | ||
1037 | /* We now require that the mount process passes the remote address */ | |
1038 | memcpy(&server->addr, &data->addr, sizeof(server->addr)); | |
1039 | if (server->addr.sin_addr.s_addr == INADDR_ANY) { | |
1040 | dprintk("%s: mount program didn't pass remote address!\n", | |
1041 | __FUNCTION__); | |
1042 | goto out_err; | |
1043 | } | |
1044 | ||
1045 | /* Fire up rpciod if not yet running */ | |
816724e6 TM |
1046 | error = rpciod_up(); |
1047 | if (error < 0) { | |
1048 | dprintk("%s: couldn't start rpciod! Error = %d\n", | |
1049 | __FUNCTION__, error); | |
f7b422b1 DH |
1050 | goto out_err; |
1051 | } | |
1052 | ||
1053 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); | |
816724e6 TM |
1054 | if (IS_ERR(s)) { |
1055 | error = PTR_ERR(s); | |
1056 | goto out_err_rpciod; | |
1057 | } | |
1058 | ||
1059 | if (s->s_root) | |
f7b422b1 DH |
1060 | goto out_rpciod_down; |
1061 | ||
1062 | s->s_flags = flags; | |
1063 | ||
1064 | error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); | |
1065 | if (error) { | |
1066 | up_write(&s->s_umount); | |
1067 | deactivate_super(s); | |
816724e6 | 1068 | return error; |
f7b422b1 DH |
1069 | } |
1070 | s->s_flags |= MS_ACTIVE; | |
816724e6 TM |
1071 | return simple_set_mnt(mnt, s); |
1072 | ||
f7b422b1 DH |
1073 | out_rpciod_down: |
1074 | rpciod_down(); | |
816724e6 TM |
1075 | kfree(server); |
1076 | return simple_set_mnt(mnt, s); | |
1077 | ||
1078 | out_err_rpciod: | |
1079 | rpciod_down(); | |
f7b422b1 DH |
1080 | out_err: |
1081 | kfree(server); | |
816724e6 TM |
1082 | out_err_noserver: |
1083 | return error; | |
f7b422b1 DH |
1084 | } |
1085 | ||
1086 | static void nfs_kill_super(struct super_block *s) | |
1087 | { | |
1088 | struct nfs_server *server = NFS_SB(s); | |
1089 | ||
1090 | kill_anon_super(s); | |
1091 | ||
1092 | if (!IS_ERR(server->client)) | |
1093 | rpc_shutdown_client(server->client); | |
1094 | if (!IS_ERR(server->client_sys)) | |
1095 | rpc_shutdown_client(server->client_sys); | |
1096 | if (!IS_ERR(server->client_acl)) | |
1097 | rpc_shutdown_client(server->client_acl); | |
1098 | ||
1099 | if (!(server->flags & NFS_MOUNT_NONLM)) | |
1100 | lockd_down(); /* release rpc.lockd */ | |
1101 | ||
1102 | rpciod_down(); /* release rpciod */ | |
1103 | ||
1104 | nfs_free_iostats(server->io_stats); | |
1105 | kfree(server->hostname); | |
1106 | kfree(server); | |
1107 | nfs_release_automount_timer(); | |
1108 | } | |
1109 | ||
1110 | static struct super_block *nfs_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data) | |
1111 | { | |
1112 | struct super_block *sb; | |
1113 | ||
1114 | server->fsid = data->fattr->fsid; | |
1115 | nfs_copy_fh(&server->fh, data->fh); | |
1116 | sb = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
1117 | if (!IS_ERR(sb) && sb->s_root == NULL && !(server->flags & NFS_MOUNT_NONLM)) | |
1118 | lockd_up(); | |
1119 | return sb; | |
1120 | } | |
1121 | ||
816724e6 TM |
1122 | static int nfs_clone_nfs_sb(struct file_system_type *fs_type, |
1123 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
1124 | { |
1125 | struct nfs_clone_mount *data = raw_data; | |
816724e6 | 1126 | return nfs_clone_generic_sb(data, nfs_clone_sb, nfs_clone_server, mnt); |
f7b422b1 DH |
1127 | } |
1128 | ||
1129 | #ifdef CONFIG_NFS_V4 | |
1130 | static struct rpc_clnt *nfs4_create_client(struct nfs_server *server, | |
1131 | struct rpc_timeout *timeparms, int proto, rpc_authflavor_t flavor) | |
1132 | { | |
1133 | struct nfs4_client *clp; | |
1134 | struct rpc_xprt *xprt = NULL; | |
1135 | struct rpc_clnt *clnt = NULL; | |
1136 | int err = -EIO; | |
1137 | ||
1138 | clp = nfs4_get_client(&server->addr.sin_addr); | |
1139 | if (!clp) { | |
1140 | dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__); | |
1141 | return ERR_PTR(err); | |
1142 | } | |
1143 | ||
1144 | /* Now create transport and client */ | |
1145 | down_write(&clp->cl_sem); | |
1146 | if (IS_ERR(clp->cl_rpcclient)) { | |
1147 | xprt = xprt_create_proto(proto, &server->addr, timeparms); | |
1148 | if (IS_ERR(xprt)) { | |
1149 | up_write(&clp->cl_sem); | |
1150 | err = PTR_ERR(xprt); | |
1151 | dprintk("%s: cannot create RPC transport. Error = %d\n", | |
1152 | __FUNCTION__, err); | |
1153 | goto out_fail; | |
1154 | } | |
1155 | /* Bind to a reserved port! */ | |
1156 | xprt->resvport = 1; | |
1157 | clnt = rpc_create_client(xprt, server->hostname, &nfs_program, | |
1158 | server->rpc_ops->version, flavor); | |
1159 | if (IS_ERR(clnt)) { | |
1160 | up_write(&clp->cl_sem); | |
1161 | err = PTR_ERR(clnt); | |
1162 | dprintk("%s: cannot create RPC client. Error = %d\n", | |
1163 | __FUNCTION__, err); | |
1164 | goto out_fail; | |
1165 | } | |
1166 | clnt->cl_intr = 1; | |
1167 | clnt->cl_softrtry = 1; | |
1168 | clp->cl_rpcclient = clnt; | |
1169 | memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr)); | |
1170 | nfs_idmap_new(clp); | |
1171 | } | |
1172 | list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); | |
1173 | clnt = rpc_clone_client(clp->cl_rpcclient); | |
1174 | if (!IS_ERR(clnt)) | |
1175 | server->nfs4_state = clp; | |
1176 | up_write(&clp->cl_sem); | |
1177 | clp = NULL; | |
1178 | ||
1179 | if (IS_ERR(clnt)) { | |
1180 | dprintk("%s: cannot create RPC client. Error = %d\n", | |
1181 | __FUNCTION__, err); | |
1182 | return clnt; | |
1183 | } | |
1184 | ||
1185 | if (server->nfs4_state->cl_idmap == NULL) { | |
1186 | dprintk("%s: failed to create idmapper.\n", __FUNCTION__); | |
1187 | return ERR_PTR(-ENOMEM); | |
1188 | } | |
1189 | ||
1190 | if (clnt->cl_auth->au_flavor != flavor) { | |
1191 | struct rpc_auth *auth; | |
1192 | ||
1193 | auth = rpcauth_create(flavor, clnt); | |
1194 | if (IS_ERR(auth)) { | |
1195 | dprintk("%s: couldn't create credcache!\n", __FUNCTION__); | |
1196 | return (struct rpc_clnt *)auth; | |
1197 | } | |
1198 | } | |
1199 | return clnt; | |
1200 | ||
1201 | out_fail: | |
1202 | if (clp) | |
1203 | nfs4_put_client(clp); | |
1204 | return ERR_PTR(err); | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Set up an NFS4 superblock | |
1209 | */ | |
1210 | static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent) | |
1211 | { | |
1212 | struct nfs_server *server; | |
1213 | struct rpc_timeout timeparms; | |
1214 | rpc_authflavor_t authflavour; | |
1215 | int err = -EIO; | |
1216 | ||
1217 | sb->s_blocksize_bits = 0; | |
1218 | sb->s_blocksize = 0; | |
1219 | server = NFS_SB(sb); | |
1220 | if (data->rsize != 0) | |
1221 | server->rsize = nfs_block_size(data->rsize, NULL); | |
1222 | if (data->wsize != 0) | |
1223 | server->wsize = nfs_block_size(data->wsize, NULL); | |
1224 | server->flags = data->flags & NFS_MOUNT_FLAGMASK; | |
1225 | server->caps = NFS_CAP_ATOMIC_OPEN; | |
1226 | ||
1227 | server->acregmin = data->acregmin*HZ; | |
1228 | server->acregmax = data->acregmax*HZ; | |
1229 | server->acdirmin = data->acdirmin*HZ; | |
1230 | server->acdirmax = data->acdirmax*HZ; | |
1231 | ||
1232 | server->rpc_ops = &nfs_v4_clientops; | |
1233 | ||
1234 | nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans); | |
1235 | ||
1236 | server->retrans_timeo = timeparms.to_initval; | |
1237 | server->retrans_count = timeparms.to_retries; | |
1238 | ||
1239 | /* Now create transport and client */ | |
1240 | authflavour = RPC_AUTH_UNIX; | |
1241 | if (data->auth_flavourlen != 0) { | |
1242 | if (data->auth_flavourlen != 1) { | |
1243 | dprintk("%s: Invalid number of RPC auth flavours %d.\n", | |
1244 | __FUNCTION__, data->auth_flavourlen); | |
1245 | err = -EINVAL; | |
1246 | goto out_fail; | |
1247 | } | |
1248 | if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) { | |
1249 | err = -EFAULT; | |
1250 | goto out_fail; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | server->client = nfs4_create_client(server, &timeparms, data->proto, authflavour); | |
1255 | if (IS_ERR(server->client)) { | |
1256 | err = PTR_ERR(server->client); | |
1257 | dprintk("%s: cannot create RPC client. Error = %d\n", | |
1258 | __FUNCTION__, err); | |
1259 | goto out_fail; | |
1260 | } | |
1261 | ||
1262 | sb->s_time_gran = 1; | |
1263 | ||
1264 | sb->s_op = &nfs4_sops; | |
1265 | err = nfs_sb_init(sb, authflavour); | |
1266 | ||
1267 | out_fail: | |
1268 | return err; | |
1269 | } | |
1270 | ||
1271 | static int nfs4_compare_super(struct super_block *sb, void *data) | |
1272 | { | |
1273 | struct nfs_server *server = data; | |
1274 | struct nfs_server *old = NFS_SB(sb); | |
1275 | ||
1276 | if (strcmp(server->hostname, old->hostname) != 0) | |
1277 | return 0; | |
1278 | if (strcmp(server->mnt_path, old->mnt_path) != 0) | |
1279 | return 0; | |
1280 | return 1; | |
1281 | } | |
1282 | ||
1283 | static void * | |
1284 | nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) | |
1285 | { | |
1286 | void *p = NULL; | |
1287 | ||
1288 | if (!src->len) | |
1289 | return ERR_PTR(-EINVAL); | |
1290 | if (src->len < maxlen) | |
1291 | maxlen = src->len; | |
1292 | if (dst == NULL) { | |
1293 | p = dst = kmalloc(maxlen + 1, GFP_KERNEL); | |
1294 | if (p == NULL) | |
1295 | return ERR_PTR(-ENOMEM); | |
1296 | } | |
1297 | if (copy_from_user(dst, src->data, maxlen)) { | |
1298 | kfree(p); | |
1299 | return ERR_PTR(-EFAULT); | |
1300 | } | |
1301 | dst[maxlen] = '\0'; | |
1302 | return dst; | |
1303 | } | |
1304 | ||
816724e6 TM |
1305 | static int nfs4_get_sb(struct file_system_type *fs_type, |
1306 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
1307 | { |
1308 | int error; | |
1309 | struct nfs_server *server; | |
1310 | struct super_block *s; | |
1311 | struct nfs4_mount_data *data = raw_data; | |
1312 | void *p; | |
1313 | ||
1314 | if (data == NULL) { | |
1315 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
816724e6 | 1316 | return -EINVAL; |
f7b422b1 DH |
1317 | } |
1318 | if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { | |
1319 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
816724e6 | 1320 | return -EINVAL; |
f7b422b1 DH |
1321 | } |
1322 | ||
1323 | server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL); | |
1324 | if (!server) | |
816724e6 | 1325 | return -ENOMEM; |
f7b422b1 DH |
1326 | /* Zero out the NFS state stuff */ |
1327 | init_nfsv4_state(server); | |
1328 | server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL); | |
1329 | ||
1330 | p = nfs_copy_user_string(NULL, &data->hostname, 256); | |
1331 | if (IS_ERR(p)) | |
1332 | goto out_err; | |
1333 | server->hostname = p; | |
1334 | ||
1335 | p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); | |
1336 | if (IS_ERR(p)) | |
1337 | goto out_err; | |
1338 | server->mnt_path = p; | |
1339 | ||
1340 | p = nfs_copy_user_string(server->ip_addr, &data->client_addr, | |
1341 | sizeof(server->ip_addr) - 1); | |
1342 | if (IS_ERR(p)) | |
1343 | goto out_err; | |
1344 | ||
1345 | /* We now require that the mount process passes the remote address */ | |
1346 | if (data->host_addrlen != sizeof(server->addr)) { | |
816724e6 | 1347 | error = -EINVAL; |
f7b422b1 DH |
1348 | goto out_free; |
1349 | } | |
1350 | if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) { | |
816724e6 | 1351 | error = -EFAULT; |
f7b422b1 DH |
1352 | goto out_free; |
1353 | } | |
1354 | if (server->addr.sin_family != AF_INET || | |
1355 | server->addr.sin_addr.s_addr == INADDR_ANY) { | |
1356 | dprintk("%s: mount program didn't pass remote IP address!\n", | |
1357 | __FUNCTION__); | |
816724e6 | 1358 | error = -EINVAL; |
f7b422b1 DH |
1359 | goto out_free; |
1360 | } | |
1361 | ||
1362 | /* Fire up rpciod if not yet running */ | |
816724e6 TM |
1363 | error = rpciod_up(); |
1364 | if (error < 0) { | |
1365 | dprintk("%s: couldn't start rpciod! Error = %d\n", | |
1366 | __FUNCTION__, error); | |
f7b422b1 DH |
1367 | goto out_free; |
1368 | } | |
1369 | ||
1370 | s = sget(fs_type, nfs4_compare_super, nfs_set_super, server); | |
1371 | ||
816724e6 TM |
1372 | if (IS_ERR(s)) { |
1373 | error = PTR_ERR(s); | |
f7b422b1 | 1374 | goto out_free; |
816724e6 TM |
1375 | } |
1376 | ||
1377 | if (s->s_root) { | |
1378 | kfree(server->mnt_path); | |
1379 | kfree(server->hostname); | |
1380 | kfree(server); | |
1381 | return simple_set_mnt(mnt, s); | |
1382 | } | |
f7b422b1 DH |
1383 | |
1384 | s->s_flags = flags; | |
1385 | ||
1386 | error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0); | |
1387 | if (error) { | |
1388 | up_write(&s->s_umount); | |
1389 | deactivate_super(s); | |
816724e6 | 1390 | return error; |
f7b422b1 DH |
1391 | } |
1392 | s->s_flags |= MS_ACTIVE; | |
816724e6 | 1393 | return simple_set_mnt(mnt, s); |
f7b422b1 | 1394 | out_err: |
816724e6 | 1395 | error = PTR_ERR(p); |
f7b422b1 DH |
1396 | out_free: |
1397 | kfree(server->mnt_path); | |
1398 | kfree(server->hostname); | |
1399 | kfree(server); | |
816724e6 | 1400 | return error; |
f7b422b1 DH |
1401 | } |
1402 | ||
1403 | static void nfs4_kill_super(struct super_block *sb) | |
1404 | { | |
1405 | struct nfs_server *server = NFS_SB(sb); | |
1406 | ||
1407 | nfs_return_all_delegations(sb); | |
1408 | kill_anon_super(sb); | |
1409 | ||
1410 | nfs4_renewd_prepare_shutdown(server); | |
1411 | ||
1412 | if (server->client != NULL && !IS_ERR(server->client)) | |
1413 | rpc_shutdown_client(server->client); | |
1414 | ||
1415 | destroy_nfsv4_state(server); | |
1416 | ||
1417 | rpciod_down(); | |
1418 | ||
1419 | nfs_free_iostats(server->io_stats); | |
1420 | kfree(server->hostname); | |
1421 | kfree(server); | |
1422 | nfs_release_automount_timer(); | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * Constructs the SERVER-side path | |
1427 | */ | |
1428 | static inline char *nfs4_dup_path(const struct dentry *dentry) | |
1429 | { | |
1430 | char *page = (char *) __get_free_page(GFP_USER); | |
1431 | char *path; | |
1432 | ||
1433 | path = nfs4_path(dentry, page, PAGE_SIZE); | |
1434 | if (!IS_ERR(path)) { | |
1435 | int len = PAGE_SIZE + page - path; | |
1436 | char *tmp = path; | |
1437 | ||
1438 | path = kmalloc(len, GFP_KERNEL); | |
1439 | if (path) | |
1440 | memcpy(path, tmp, len); | |
1441 | else | |
1442 | path = ERR_PTR(-ENOMEM); | |
1443 | } | |
1444 | free_page((unsigned long)page); | |
1445 | return path; | |
1446 | } | |
1447 | ||
1448 | static struct super_block *nfs4_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data) | |
1449 | { | |
1450 | const struct dentry *dentry = data->dentry; | |
1451 | struct nfs4_client *clp = server->nfs4_state; | |
1452 | struct super_block *sb; | |
1453 | ||
1454 | server->fsid = data->fattr->fsid; | |
1455 | nfs_copy_fh(&server->fh, data->fh); | |
1456 | server->mnt_path = nfs4_dup_path(dentry); | |
1457 | if (IS_ERR(server->mnt_path)) { | |
1458 | sb = (struct super_block *)server->mnt_path; | |
1459 | goto err; | |
1460 | } | |
1461 | sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server); | |
1462 | if (IS_ERR(sb) || sb->s_root) | |
1463 | goto free_path; | |
1464 | nfs4_server_capabilities(server, &server->fh); | |
1465 | ||
1466 | down_write(&clp->cl_sem); | |
1467 | atomic_inc(&clp->cl_count); | |
1468 | list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks); | |
1469 | up_write(&clp->cl_sem); | |
1470 | return sb; | |
1471 | free_path: | |
1472 | kfree(server->mnt_path); | |
1473 | err: | |
1474 | server->mnt_path = NULL; | |
1475 | return sb; | |
1476 | } | |
1477 | ||
816724e6 TM |
1478 | static int nfs_clone_nfs4_sb(struct file_system_type *fs_type, |
1479 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
1480 | { |
1481 | struct nfs_clone_mount *data = raw_data; | |
816724e6 | 1482 | return nfs_clone_generic_sb(data, nfs4_clone_sb, nfs_clone_server, mnt); |
f7b422b1 DH |
1483 | } |
1484 | ||
1485 | static struct super_block *nfs4_referral_sb(struct nfs_server *server, struct nfs_clone_mount *data) | |
1486 | { | |
1487 | struct super_block *sb = ERR_PTR(-ENOMEM); | |
1488 | int len; | |
1489 | ||
1490 | len = strlen(data->mnt_path) + 1; | |
1491 | server->mnt_path = kmalloc(len, GFP_KERNEL); | |
1492 | if (server->mnt_path == NULL) | |
1493 | goto err; | |
1494 | memcpy(server->mnt_path, data->mnt_path, len); | |
1495 | memcpy(&server->addr, data->addr, sizeof(struct sockaddr_in)); | |
1496 | ||
1497 | sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server); | |
1498 | if (IS_ERR(sb) || sb->s_root) | |
1499 | goto free_path; | |
1500 | return sb; | |
1501 | free_path: | |
1502 | kfree(server->mnt_path); | |
1503 | err: | |
1504 | server->mnt_path = NULL; | |
1505 | return sb; | |
1506 | } | |
1507 | ||
1508 | static struct nfs_server *nfs4_referral_server(struct super_block *sb, struct nfs_clone_mount *data) | |
1509 | { | |
1510 | struct nfs_server *server = NFS_SB(sb); | |
1511 | struct rpc_timeout timeparms; | |
1512 | int proto, timeo, retrans; | |
1513 | void *err; | |
1514 | ||
1515 | proto = IPPROTO_TCP; | |
1516 | /* Since we are following a referral and there may be alternatives, | |
1517 | set the timeouts and retries to low values */ | |
1518 | timeo = 2; | |
1519 | retrans = 1; | |
1520 | nfs_init_timeout_values(&timeparms, proto, timeo, retrans); | |
1521 | ||
1522 | server->client = nfs4_create_client(server, &timeparms, proto, data->authflavor); | |
1523 | if (IS_ERR((err = server->client))) | |
1524 | goto out_err; | |
1525 | ||
1526 | sb->s_time_gran = 1; | |
1527 | sb->s_op = &nfs4_sops; | |
1528 | err = ERR_PTR(nfs_sb_init(sb, data->authflavor)); | |
1529 | if (!IS_ERR(err)) | |
1530 | return server; | |
1531 | out_err: | |
1532 | return (struct nfs_server *)err; | |
1533 | } | |
1534 | ||
816724e6 TM |
1535 | static int nfs_referral_nfs4_sb(struct file_system_type *fs_type, |
1536 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 DH |
1537 | { |
1538 | struct nfs_clone_mount *data = raw_data; | |
816724e6 | 1539 | return nfs_clone_generic_sb(data, nfs4_referral_sb, nfs4_referral_server, mnt); |
f7b422b1 DH |
1540 | } |
1541 | ||
1542 | #endif |