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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 | * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a | |
17 | * particular server are held in the same superblock | |
18 | * - NFS superblocks can have several effective roots to the dentry tree | |
19 | * - directory type roots are spliced into the tree when a path from one root reaches the root | |
20 | * of another (see nfs_lookup()) | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | ||
26 | #include <linux/time.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/stat.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/unistd.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
34 | #include <linux/sunrpc/stats.h> | |
35 | #include <linux/sunrpc/metrics.h> | |
36 | #include <linux/nfs_fs.h> | |
37 | #include <linux/nfs_mount.h> | |
38 | #include <linux/nfs4_mount.h> | |
39 | #include <linux/lockd/bind.h> | |
40 | #include <linux/smp_lock.h> | |
41 | #include <linux/seq_file.h> | |
42 | #include <linux/mount.h> | |
43 | #include <linux/nfs_idmap.h> | |
44 | #include <linux/vfs.h> | |
45 | #include <linux/inet.h> | |
46 | #include <linux/nfs_xdr.h> | |
47 | #include <linux/magic.h> | |
48 | ||
49 | #include <asm/system.h> | |
50 | #include <asm/uaccess.h> | |
51 | ||
52 | #include "nfs4_fs.h" | |
53 | #include "callback.h" | |
54 | #include "delegation.h" | |
55 | #include "iostat.h" | |
56 | #include "internal.h" | |
57 | ||
58 | #define NFSDBG_FACILITY NFSDBG_VFS | |
59 | ||
60 | static void nfs_umount_begin(struct vfsmount *, int); | |
61 | static int nfs_statfs(struct dentry *, struct kstatfs *); | |
62 | static int nfs_show_options(struct seq_file *, struct vfsmount *); | |
63 | static int nfs_show_stats(struct seq_file *, struct vfsmount *); | |
64 | static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); | |
65 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, | |
66 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
67 | static void nfs_kill_super(struct super_block *); | |
68 | ||
69 | static struct file_system_type nfs_fs_type = { | |
70 | .owner = THIS_MODULE, | |
71 | .name = "nfs", | |
72 | .get_sb = nfs_get_sb, | |
73 | .kill_sb = nfs_kill_super, | |
74 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
75 | }; | |
76 | ||
77 | struct file_system_type nfs_xdev_fs_type = { | |
78 | .owner = THIS_MODULE, | |
79 | .name = "nfs", | |
80 | .get_sb = nfs_xdev_get_sb, | |
81 | .kill_sb = nfs_kill_super, | |
82 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
83 | }; | |
84 | ||
85 | static const struct super_operations nfs_sops = { | |
86 | .alloc_inode = nfs_alloc_inode, | |
87 | .destroy_inode = nfs_destroy_inode, | |
88 | .write_inode = nfs_write_inode, | |
89 | .statfs = nfs_statfs, | |
90 | .clear_inode = nfs_clear_inode, | |
91 | .umount_begin = nfs_umount_begin, | |
92 | .show_options = nfs_show_options, | |
93 | .show_stats = nfs_show_stats, | |
94 | }; | |
95 | ||
96 | #ifdef CONFIG_NFS_V4 | |
97 | static int nfs4_get_sb(struct file_system_type *fs_type, | |
98 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
99 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, | |
100 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
101 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, | |
102 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); | |
103 | static void nfs4_kill_super(struct super_block *sb); | |
104 | ||
105 | static struct file_system_type nfs4_fs_type = { | |
106 | .owner = THIS_MODULE, | |
107 | .name = "nfs4", | |
108 | .get_sb = nfs4_get_sb, | |
109 | .kill_sb = nfs4_kill_super, | |
110 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
111 | }; | |
112 | ||
113 | struct file_system_type nfs4_xdev_fs_type = { | |
114 | .owner = THIS_MODULE, | |
115 | .name = "nfs4", | |
116 | .get_sb = nfs4_xdev_get_sb, | |
117 | .kill_sb = nfs4_kill_super, | |
118 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
119 | }; | |
120 | ||
121 | struct file_system_type nfs4_referral_fs_type = { | |
122 | .owner = THIS_MODULE, | |
123 | .name = "nfs4", | |
124 | .get_sb = nfs4_referral_get_sb, | |
125 | .kill_sb = nfs4_kill_super, | |
126 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
127 | }; | |
128 | ||
129 | static const struct super_operations nfs4_sops = { | |
130 | .alloc_inode = nfs_alloc_inode, | |
131 | .destroy_inode = nfs_destroy_inode, | |
132 | .write_inode = nfs_write_inode, | |
133 | .statfs = nfs_statfs, | |
134 | .clear_inode = nfs4_clear_inode, | |
135 | .umount_begin = nfs_umount_begin, | |
136 | .show_options = nfs_show_options, | |
137 | .show_stats = nfs_show_stats, | |
138 | }; | |
139 | #endif | |
140 | ||
141 | static struct shrinker *acl_shrinker; | |
142 | ||
143 | /* | |
144 | * Register the NFS filesystems | |
145 | */ | |
146 | int __init register_nfs_fs(void) | |
147 | { | |
148 | int ret; | |
149 | ||
150 | ret = register_filesystem(&nfs_fs_type); | |
151 | if (ret < 0) | |
152 | goto error_0; | |
153 | ||
154 | ret = nfs_register_sysctl(); | |
155 | if (ret < 0) | |
156 | goto error_1; | |
157 | #ifdef CONFIG_NFS_V4 | |
158 | ret = register_filesystem(&nfs4_fs_type); | |
159 | if (ret < 0) | |
160 | goto error_2; | |
161 | #endif | |
162 | acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker); | |
163 | return 0; | |
164 | ||
165 | #ifdef CONFIG_NFS_V4 | |
166 | error_2: | |
167 | nfs_unregister_sysctl(); | |
168 | #endif | |
169 | error_1: | |
170 | unregister_filesystem(&nfs_fs_type); | |
171 | error_0: | |
172 | return ret; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Unregister the NFS filesystems | |
177 | */ | |
178 | void __exit unregister_nfs_fs(void) | |
179 | { | |
180 | if (acl_shrinker != NULL) | |
181 | remove_shrinker(acl_shrinker); | |
182 | #ifdef CONFIG_NFS_V4 | |
183 | unregister_filesystem(&nfs4_fs_type); | |
184 | nfs_unregister_sysctl(); | |
185 | #endif | |
186 | unregister_filesystem(&nfs_fs_type); | |
187 | } | |
188 | ||
189 | /* | |
190 | * Deliver file system statistics to userspace | |
191 | */ | |
192 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
193 | { | |
194 | struct nfs_server *server = NFS_SB(dentry->d_sb); | |
195 | unsigned char blockbits; | |
196 | unsigned long blockres; | |
197 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); | |
198 | struct nfs_fattr fattr; | |
199 | struct nfs_fsstat res = { | |
200 | .fattr = &fattr, | |
201 | }; | |
202 | int error; | |
203 | ||
204 | lock_kernel(); | |
205 | ||
206 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); | |
207 | if (error < 0) | |
208 | goto out_err; | |
209 | buf->f_type = NFS_SUPER_MAGIC; | |
210 | ||
211 | /* | |
212 | * Current versions of glibc do not correctly handle the | |
213 | * case where f_frsize != f_bsize. Eventually we want to | |
214 | * report the value of wtmult in this field. | |
215 | */ | |
216 | buf->f_frsize = dentry->d_sb->s_blocksize; | |
217 | ||
218 | /* | |
219 | * On most *nix systems, f_blocks, f_bfree, and f_bavail | |
220 | * are reported in units of f_frsize. Linux hasn't had | |
221 | * an f_frsize field in its statfs struct until recently, | |
222 | * thus historically Linux's sys_statfs reports these | |
223 | * fields in units of f_bsize. | |
224 | */ | |
225 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
226 | blockbits = dentry->d_sb->s_blocksize_bits; | |
227 | blockres = (1 << blockbits) - 1; | |
228 | buf->f_blocks = (res.tbytes + blockres) >> blockbits; | |
229 | buf->f_bfree = (res.fbytes + blockres) >> blockbits; | |
230 | buf->f_bavail = (res.abytes + blockres) >> blockbits; | |
231 | ||
232 | buf->f_files = res.tfiles; | |
233 | buf->f_ffree = res.afiles; | |
234 | ||
235 | buf->f_namelen = server->namelen; | |
236 | ||
237 | unlock_kernel(); | |
238 | return 0; | |
239 | ||
240 | out_err: | |
241 | dprintk("%s: statfs error = %d\n", __FUNCTION__, -error); | |
242 | unlock_kernel(); | |
243 | return error; | |
244 | } | |
245 | ||
246 | /* | |
247 | * Map the security flavour number to a name | |
248 | */ | |
249 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) | |
250 | { | |
251 | static const struct { | |
252 | rpc_authflavor_t flavour; | |
253 | const char *str; | |
254 | } sec_flavours[] = { | |
255 | { RPC_AUTH_NULL, "null" }, | |
256 | { RPC_AUTH_UNIX, "sys" }, | |
257 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
258 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
259 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
260 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
261 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
262 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
263 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
264 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
265 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
266 | { -1, "unknown" } | |
267 | }; | |
268 | int i; | |
269 | ||
270 | for (i=0; sec_flavours[i].flavour != -1; i++) { | |
271 | if (sec_flavours[i].flavour == flavour) | |
272 | break; | |
273 | } | |
274 | return sec_flavours[i].str; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Describe the mount options in force on this server representation | |
279 | */ | |
280 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) | |
281 | { | |
282 | static const struct proc_nfs_info { | |
283 | int flag; | |
284 | const char *str; | |
285 | const char *nostr; | |
286 | } nfs_info[] = { | |
287 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
288 | { NFS_MOUNT_INTR, ",intr", "" }, | |
289 | { NFS_MOUNT_NOCTO, ",nocto", "" }, | |
290 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
291 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
292 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
293 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, | |
294 | { 0, NULL, NULL } | |
295 | }; | |
296 | const struct proc_nfs_info *nfs_infop; | |
297 | struct nfs_client *clp = nfss->nfs_client; | |
298 | char buf[12]; | |
299 | const char *proto; | |
300 | ||
301 | seq_printf(m, ",vers=%d", clp->rpc_ops->version); | |
302 | seq_printf(m, ",rsize=%d", nfss->rsize); | |
303 | seq_printf(m, ",wsize=%d", nfss->wsize); | |
304 | if (nfss->acregmin != 3*HZ || showdefaults) | |
305 | seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ); | |
306 | if (nfss->acregmax != 60*HZ || showdefaults) | |
307 | seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ); | |
308 | if (nfss->acdirmin != 30*HZ || showdefaults) | |
309 | seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ); | |
310 | if (nfss->acdirmax != 60*HZ || showdefaults) | |
311 | seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ); | |
312 | for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { | |
313 | if (nfss->flags & nfs_infop->flag) | |
314 | seq_puts(m, nfs_infop->str); | |
315 | else | |
316 | seq_puts(m, nfs_infop->nostr); | |
317 | } | |
318 | switch (nfss->client->cl_xprt->prot) { | |
319 | case IPPROTO_TCP: | |
320 | proto = "tcp"; | |
321 | break; | |
322 | case IPPROTO_UDP: | |
323 | proto = "udp"; | |
324 | break; | |
325 | default: | |
326 | snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot); | |
327 | proto = buf; | |
328 | } | |
329 | seq_printf(m, ",proto=%s", proto); | |
330 | seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ); | |
331 | seq_printf(m, ",retrans=%u", clp->retrans_count); | |
332 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); | |
333 | } | |
334 | ||
335 | /* | |
336 | * Describe the mount options on this VFS mountpoint | |
337 | */ | |
338 | static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
339 | { | |
340 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
341 | ||
342 | nfs_show_mount_options(m, nfss, 0); | |
343 | ||
344 | seq_puts(m, ",addr="); | |
345 | seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\"); | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | /* | |
351 | * Present statistical information for this VFS mountpoint | |
352 | */ | |
353 | static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt) | |
354 | { | |
355 | int i, cpu; | |
356 | struct nfs_server *nfss = NFS_SB(mnt->mnt_sb); | |
357 | struct rpc_auth *auth = nfss->client->cl_auth; | |
358 | struct nfs_iostats totals = { }; | |
359 | ||
360 | seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); | |
361 | ||
362 | /* | |
363 | * Display all mount option settings | |
364 | */ | |
365 | seq_printf(m, "\n\topts:\t"); | |
366 | seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw"); | |
367 | seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : ""); | |
368 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : ""); | |
369 | seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : ""); | |
370 | nfs_show_mount_options(m, nfss, 1); | |
371 | ||
372 | seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); | |
373 | ||
374 | seq_printf(m, "\n\tcaps:\t"); | |
375 | seq_printf(m, "caps=0x%x", nfss->caps); | |
376 | seq_printf(m, ",wtmult=%d", nfss->wtmult); | |
377 | seq_printf(m, ",dtsize=%d", nfss->dtsize); | |
378 | seq_printf(m, ",bsize=%d", nfss->bsize); | |
379 | seq_printf(m, ",namelen=%d", nfss->namelen); | |
380 | ||
381 | #ifdef CONFIG_NFS_V4 | |
382 | if (nfss->nfs_client->cl_nfsversion == 4) { | |
383 | seq_printf(m, "\n\tnfsv4:\t"); | |
384 | seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); | |
385 | seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); | |
386 | seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); | |
387 | } | |
388 | #endif | |
389 | ||
390 | /* | |
391 | * Display security flavor in effect for this mount | |
392 | */ | |
393 | seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor); | |
394 | if (auth->au_flavor) | |
395 | seq_printf(m, ",pseudoflavor=%d", auth->au_flavor); | |
396 | ||
397 | /* | |
398 | * Display superblock I/O counters | |
399 | */ | |
400 | for_each_possible_cpu(cpu) { | |
401 | struct nfs_iostats *stats; | |
402 | ||
403 | preempt_disable(); | |
404 | stats = per_cpu_ptr(nfss->io_stats, cpu); | |
405 | ||
406 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
407 | totals.events[i] += stats->events[i]; | |
408 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
409 | totals.bytes[i] += stats->bytes[i]; | |
410 | ||
411 | preempt_enable(); | |
412 | } | |
413 | ||
414 | seq_printf(m, "\n\tevents:\t"); | |
415 | for (i = 0; i < __NFSIOS_COUNTSMAX; i++) | |
416 | seq_printf(m, "%lu ", totals.events[i]); | |
417 | seq_printf(m, "\n\tbytes:\t"); | |
418 | for (i = 0; i < __NFSIOS_BYTESMAX; i++) | |
419 | seq_printf(m, "%Lu ", totals.bytes[i]); | |
420 | seq_printf(m, "\n"); | |
421 | ||
422 | rpc_print_iostats(m, nfss->client); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | /* | |
428 | * Begin unmount by attempting to remove all automounted mountpoints we added | |
429 | * in response to xdev traversals and referrals | |
430 | */ | |
431 | static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags) | |
432 | { | |
433 | struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb); | |
434 | struct rpc_clnt *rpc; | |
435 | ||
436 | shrink_submounts(vfsmnt, &nfs_automount_list); | |
437 | ||
438 | if (!(flags & MNT_FORCE)) | |
439 | return; | |
440 | /* -EIO all pending I/O */ | |
441 | rpc = server->client_acl; | |
442 | if (!IS_ERR(rpc)) | |
443 | rpc_killall_tasks(rpc); | |
444 | rpc = server->client; | |
445 | if (!IS_ERR(rpc)) | |
446 | rpc_killall_tasks(rpc); | |
447 | } | |
448 | ||
449 | /* | |
450 | * Validate the NFS2/NFS3 mount data | |
451 | * - fills in the mount root filehandle | |
452 | */ | |
453 | static int nfs_validate_mount_data(struct nfs_mount_data *data, | |
454 | struct nfs_fh *mntfh) | |
455 | { | |
456 | if (data == NULL) { | |
457 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
458 | return -EINVAL; | |
459 | } | |
460 | ||
461 | if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { | |
462 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | switch (data->version) { | |
467 | case 1: | |
468 | data->namlen = 0; | |
469 | case 2: | |
470 | data->bsize = 0; | |
471 | case 3: | |
472 | if (data->flags & NFS_MOUNT_VER3) { | |
473 | dprintk("%s: mount structure version %d does not support NFSv3\n", | |
474 | __FUNCTION__, | |
475 | data->version); | |
476 | return -EINVAL; | |
477 | } | |
478 | data->root.size = NFS2_FHSIZE; | |
479 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
480 | case 4: | |
481 | if (data->flags & NFS_MOUNT_SECFLAVOUR) { | |
482 | dprintk("%s: mount structure version %d does not support strong security\n", | |
483 | __FUNCTION__, | |
484 | data->version); | |
485 | return -EINVAL; | |
486 | } | |
487 | case 5: | |
488 | memset(data->context, 0, sizeof(data->context)); | |
489 | } | |
490 | ||
491 | /* Set the pseudoflavor */ | |
492 | if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) | |
493 | data->pseudoflavor = RPC_AUTH_UNIX; | |
494 | ||
495 | #ifndef CONFIG_NFS_V3 | |
496 | /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ | |
497 | if (data->flags & NFS_MOUNT_VER3) { | |
498 | dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); | |
499 | return -EPROTONOSUPPORT; | |
500 | } | |
501 | #endif /* CONFIG_NFS_V3 */ | |
502 | ||
503 | /* We now require that the mount process passes the remote address */ | |
504 | if (data->addr.sin_addr.s_addr == INADDR_ANY) { | |
505 | dprintk("%s: mount program didn't pass remote address!\n", | |
506 | __FUNCTION__); | |
507 | return -EINVAL; | |
508 | } | |
509 | ||
510 | /* Prepare the root filehandle */ | |
511 | if (data->flags & NFS_MOUNT_VER3) | |
512 | mntfh->size = data->root.size; | |
513 | else | |
514 | mntfh->size = NFS2_FHSIZE; | |
515 | ||
516 | if (mntfh->size > sizeof(mntfh->data)) { | |
517 | dprintk("%s: invalid root filehandle\n", __FUNCTION__); | |
518 | return -EINVAL; | |
519 | } | |
520 | ||
521 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
522 | if (mntfh->size < sizeof(mntfh->data)) | |
523 | memset(mntfh->data + mntfh->size, 0, | |
524 | sizeof(mntfh->data) - mntfh->size); | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | /* | |
530 | * Initialise the common bits of the superblock | |
531 | */ | |
532 | static inline void nfs_initialise_sb(struct super_block *sb) | |
533 | { | |
534 | struct nfs_server *server = NFS_SB(sb); | |
535 | ||
536 | sb->s_magic = NFS_SUPER_MAGIC; | |
537 | ||
538 | /* We probably want something more informative here */ | |
539 | snprintf(sb->s_id, sizeof(sb->s_id), | |
540 | "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
541 | ||
542 | if (sb->s_blocksize == 0) | |
543 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
544 | &sb->s_blocksize_bits); | |
545 | ||
546 | if (server->flags & NFS_MOUNT_NOAC) | |
547 | sb->s_flags |= MS_SYNCHRONOUS; | |
548 | ||
549 | nfs_super_set_maxbytes(sb, server->maxfilesize); | |
550 | } | |
551 | ||
552 | /* | |
553 | * Finish setting up an NFS2/3 superblock | |
554 | */ | |
555 | static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data) | |
556 | { | |
557 | struct nfs_server *server = NFS_SB(sb); | |
558 | ||
559 | sb->s_blocksize_bits = 0; | |
560 | sb->s_blocksize = 0; | |
561 | if (data->bsize) | |
562 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
563 | ||
564 | if (server->flags & NFS_MOUNT_VER3) { | |
565 | /* The VFS shouldn't apply the umask to mode bits. We will do | |
566 | * so ourselves when necessary. | |
567 | */ | |
568 | sb->s_flags |= MS_POSIXACL; | |
569 | sb->s_time_gran = 1; | |
570 | } | |
571 | ||
572 | sb->s_op = &nfs_sops; | |
573 | nfs_initialise_sb(sb); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Finish setting up a cloned NFS2/3 superblock | |
578 | */ | |
579 | static void nfs_clone_super(struct super_block *sb, | |
580 | const struct super_block *old_sb) | |
581 | { | |
582 | struct nfs_server *server = NFS_SB(sb); | |
583 | ||
584 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
585 | sb->s_blocksize = old_sb->s_blocksize; | |
586 | sb->s_maxbytes = old_sb->s_maxbytes; | |
587 | ||
588 | if (server->flags & NFS_MOUNT_VER3) { | |
589 | /* The VFS shouldn't apply the umask to mode bits. We will do | |
590 | * so ourselves when necessary. | |
591 | */ | |
592 | sb->s_flags |= MS_POSIXACL; | |
593 | sb->s_time_gran = 1; | |
594 | } | |
595 | ||
596 | sb->s_op = old_sb->s_op; | |
597 | nfs_initialise_sb(sb); | |
598 | } | |
599 | ||
600 | static int nfs_set_super(struct super_block *s, void *_server) | |
601 | { | |
602 | struct nfs_server *server = _server; | |
603 | int ret; | |
604 | ||
605 | s->s_fs_info = server; | |
606 | ret = set_anon_super(s, server); | |
607 | if (ret == 0) | |
608 | server->s_dev = s->s_dev; | |
609 | return ret; | |
610 | } | |
611 | ||
612 | static int nfs_compare_super(struct super_block *sb, void *data) | |
613 | { | |
614 | struct nfs_server *server = data, *old = NFS_SB(sb); | |
615 | ||
616 | if (old->nfs_client != server->nfs_client) | |
617 | return 0; | |
618 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) | |
619 | return 0; | |
620 | return 1; | |
621 | } | |
622 | ||
623 | static int nfs_get_sb(struct file_system_type *fs_type, | |
624 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
625 | { | |
626 | struct nfs_server *server = NULL; | |
627 | struct super_block *s; | |
628 | struct nfs_fh mntfh; | |
629 | struct nfs_mount_data *data = raw_data; | |
630 | struct dentry *mntroot; | |
631 | int error; | |
632 | ||
633 | /* Validate the mount data */ | |
634 | error = nfs_validate_mount_data(data, &mntfh); | |
635 | if (error < 0) | |
636 | goto out; | |
637 | ||
638 | /* Get a volume representation */ | |
639 | server = nfs_create_server(data, &mntfh); | |
640 | if (IS_ERR(server)) { | |
641 | error = PTR_ERR(server); | |
642 | goto out; | |
643 | } | |
644 | ||
645 | /* Get a superblock - note that we may end up sharing one that already exists */ | |
646 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); | |
647 | if (IS_ERR(s)) { | |
648 | error = PTR_ERR(s); | |
649 | goto out_err_nosb; | |
650 | } | |
651 | ||
652 | if (s->s_fs_info != server) { | |
653 | nfs_free_server(server); | |
654 | server = NULL; | |
655 | } | |
656 | ||
657 | if (!s->s_root) { | |
658 | /* initial superblock/root creation */ | |
659 | s->s_flags = flags; | |
660 | nfs_fill_super(s, data); | |
661 | } | |
662 | ||
663 | mntroot = nfs_get_root(s, &mntfh); | |
664 | if (IS_ERR(mntroot)) { | |
665 | error = PTR_ERR(mntroot); | |
666 | goto error_splat_super; | |
667 | } | |
668 | ||
669 | s->s_flags |= MS_ACTIVE; | |
670 | mnt->mnt_sb = s; | |
671 | mnt->mnt_root = mntroot; | |
672 | error = 0; | |
673 | ||
674 | out: | |
675 | return error; | |
676 | ||
677 | out_err_nosb: | |
678 | nfs_free_server(server); | |
679 | goto out; | |
680 | ||
681 | error_splat_super: | |
682 | up_write(&s->s_umount); | |
683 | deactivate_super(s); | |
684 | goto out; | |
685 | } | |
686 | ||
687 | /* | |
688 | * Destroy an NFS2/3 superblock | |
689 | */ | |
690 | static void nfs_kill_super(struct super_block *s) | |
691 | { | |
692 | struct nfs_server *server = NFS_SB(s); | |
693 | ||
694 | kill_anon_super(s); | |
695 | nfs_free_server(server); | |
696 | } | |
697 | ||
698 | /* | |
699 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
700 | */ | |
701 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, | |
702 | const char *dev_name, void *raw_data, | |
703 | struct vfsmount *mnt) | |
704 | { | |
705 | struct nfs_clone_mount *data = raw_data; | |
706 | struct super_block *s; | |
707 | struct nfs_server *server; | |
708 | struct dentry *mntroot; | |
709 | int error; | |
710 | ||
711 | dprintk("--> nfs_xdev_get_sb()\n"); | |
712 | ||
713 | /* create a new volume representation */ | |
714 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
715 | if (IS_ERR(server)) { | |
716 | error = PTR_ERR(server); | |
717 | goto out_err_noserver; | |
718 | } | |
719 | ||
720 | /* Get a superblock - note that we may end up sharing one that already exists */ | |
721 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
722 | if (IS_ERR(s)) { | |
723 | error = PTR_ERR(s); | |
724 | goto out_err_nosb; | |
725 | } | |
726 | ||
727 | if (s->s_fs_info != server) { | |
728 | nfs_free_server(server); | |
729 | server = NULL; | |
730 | } | |
731 | ||
732 | if (!s->s_root) { | |
733 | /* initial superblock/root creation */ | |
734 | s->s_flags = flags; | |
735 | nfs_clone_super(s, data->sb); | |
736 | } | |
737 | ||
738 | mntroot = nfs_get_root(s, data->fh); | |
739 | if (IS_ERR(mntroot)) { | |
740 | error = PTR_ERR(mntroot); | |
741 | goto error_splat_super; | |
742 | } | |
743 | ||
744 | s->s_flags |= MS_ACTIVE; | |
745 | mnt->mnt_sb = s; | |
746 | mnt->mnt_root = mntroot; | |
747 | ||
748 | dprintk("<-- nfs_xdev_get_sb() = 0\n"); | |
749 | return 0; | |
750 | ||
751 | out_err_nosb: | |
752 | nfs_free_server(server); | |
753 | out_err_noserver: | |
754 | dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); | |
755 | return error; | |
756 | ||
757 | error_splat_super: | |
758 | up_write(&s->s_umount); | |
759 | deactivate_super(s); | |
760 | dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); | |
761 | return error; | |
762 | } | |
763 | ||
764 | #ifdef CONFIG_NFS_V4 | |
765 | ||
766 | /* | |
767 | * Finish setting up a cloned NFS4 superblock | |
768 | */ | |
769 | static void nfs4_clone_super(struct super_block *sb, | |
770 | const struct super_block *old_sb) | |
771 | { | |
772 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
773 | sb->s_blocksize = old_sb->s_blocksize; | |
774 | sb->s_maxbytes = old_sb->s_maxbytes; | |
775 | sb->s_time_gran = 1; | |
776 | sb->s_op = old_sb->s_op; | |
777 | nfs_initialise_sb(sb); | |
778 | } | |
779 | ||
780 | /* | |
781 | * Set up an NFS4 superblock | |
782 | */ | |
783 | static void nfs4_fill_super(struct super_block *sb) | |
784 | { | |
785 | sb->s_time_gran = 1; | |
786 | sb->s_op = &nfs4_sops; | |
787 | nfs_initialise_sb(sb); | |
788 | } | |
789 | ||
790 | /* | |
791 | * Get the superblock for an NFS4 mountpoint | |
792 | */ | |
793 | static int nfs4_get_sb(struct file_system_type *fs_type, | |
794 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
795 | { | |
796 | struct nfs4_mount_data *data = raw_data; | |
797 | struct super_block *s; | |
798 | struct nfs_server *server; | |
799 | struct sockaddr_in addr; | |
800 | rpc_authflavor_t authflavour; | |
801 | struct nfs_fh mntfh; | |
802 | struct dentry *mntroot; | |
803 | char *p, *mntpath = NULL, *hostname = NULL, *ip_addr = NULL; | |
804 | int error; | |
805 | ||
806 | if (data == NULL) { | |
807 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
808 | return -EINVAL; | |
809 | } | |
810 | if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { | |
811 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
812 | return -EINVAL; | |
813 | } | |
814 | ||
815 | /* We now require that the mount process passes the remote address */ | |
816 | if (data->host_addrlen != sizeof(addr)) | |
817 | return -EINVAL; | |
818 | ||
819 | if (copy_from_user(&addr, data->host_addr, sizeof(addr))) | |
820 | return -EFAULT; | |
821 | ||
822 | if (addr.sin_family != AF_INET || | |
823 | addr.sin_addr.s_addr == INADDR_ANY | |
824 | ) { | |
825 | dprintk("%s: mount program didn't pass remote IP address!\n", | |
826 | __FUNCTION__); | |
827 | return -EINVAL; | |
828 | } | |
829 | /* RFC3530: The default port for NFS is 2049 */ | |
830 | if (addr.sin_port == 0) | |
831 | addr.sin_port = htons(NFS_PORT); | |
832 | ||
833 | /* Grab the authentication type */ | |
834 | authflavour = RPC_AUTH_UNIX; | |
835 | if (data->auth_flavourlen != 0) { | |
836 | if (data->auth_flavourlen != 1) { | |
837 | dprintk("%s: Invalid number of RPC auth flavours %d.\n", | |
838 | __FUNCTION__, data->auth_flavourlen); | |
839 | error = -EINVAL; | |
840 | goto out; | |
841 | } | |
842 | ||
843 | if (copy_from_user(&authflavour, data->auth_flavours, | |
844 | sizeof(authflavour))) { | |
845 | error = -EFAULT; | |
846 | goto out; | |
847 | } | |
848 | } | |
849 | ||
850 | p = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
851 | if (IS_ERR(p)) | |
852 | goto out_err; | |
853 | hostname = p; | |
854 | ||
855 | p = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
856 | if (IS_ERR(p)) | |
857 | goto out_err; | |
858 | mntpath = p; | |
859 | ||
860 | dprintk("MNTPATH: %s\n", mntpath); | |
861 | ||
862 | p = strndup_user(data->client_addr.data, 16); | |
863 | if (IS_ERR(p)) | |
864 | goto out_err; | |
865 | ip_addr = p; | |
866 | ||
867 | /* Get a volume representation */ | |
868 | server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr, | |
869 | authflavour, &mntfh); | |
870 | if (IS_ERR(server)) { | |
871 | error = PTR_ERR(server); | |
872 | goto out; | |
873 | } | |
874 | ||
875 | /* Get a superblock - note that we may end up sharing one that already exists */ | |
876 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); | |
877 | if (IS_ERR(s)) { | |
878 | error = PTR_ERR(s); | |
879 | goto out_free; | |
880 | } | |
881 | ||
882 | if (s->s_fs_info != server) { | |
883 | nfs_free_server(server); | |
884 | server = NULL; | |
885 | } | |
886 | ||
887 | if (!s->s_root) { | |
888 | /* initial superblock/root creation */ | |
889 | s->s_flags = flags; | |
890 | nfs4_fill_super(s); | |
891 | } | |
892 | ||
893 | mntroot = nfs4_get_root(s, &mntfh); | |
894 | if (IS_ERR(mntroot)) { | |
895 | error = PTR_ERR(mntroot); | |
896 | goto error_splat_super; | |
897 | } | |
898 | ||
899 | s->s_flags |= MS_ACTIVE; | |
900 | mnt->mnt_sb = s; | |
901 | mnt->mnt_root = mntroot; | |
902 | error = 0; | |
903 | ||
904 | out: | |
905 | kfree(ip_addr); | |
906 | kfree(mntpath); | |
907 | kfree(hostname); | |
908 | return error; | |
909 | ||
910 | out_err: | |
911 | error = PTR_ERR(p); | |
912 | goto out; | |
913 | ||
914 | out_free: | |
915 | nfs_free_server(server); | |
916 | goto out; | |
917 | ||
918 | error_splat_super: | |
919 | up_write(&s->s_umount); | |
920 | deactivate_super(s); | |
921 | goto out; | |
922 | } | |
923 | ||
924 | static void nfs4_kill_super(struct super_block *sb) | |
925 | { | |
926 | struct nfs_server *server = NFS_SB(sb); | |
927 | ||
928 | nfs_return_all_delegations(sb); | |
929 | kill_anon_super(sb); | |
930 | ||
931 | nfs4_renewd_prepare_shutdown(server); | |
932 | nfs_free_server(server); | |
933 | } | |
934 | ||
935 | /* | |
936 | * Clone an NFS4 server record on xdev traversal (FSID-change) | |
937 | */ | |
938 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, | |
939 | const char *dev_name, void *raw_data, | |
940 | struct vfsmount *mnt) | |
941 | { | |
942 | struct nfs_clone_mount *data = raw_data; | |
943 | struct super_block *s; | |
944 | struct nfs_server *server; | |
945 | struct dentry *mntroot; | |
946 | int error; | |
947 | ||
948 | dprintk("--> nfs4_xdev_get_sb()\n"); | |
949 | ||
950 | /* create a new volume representation */ | |
951 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
952 | if (IS_ERR(server)) { | |
953 | error = PTR_ERR(server); | |
954 | goto out_err_noserver; | |
955 | } | |
956 | ||
957 | /* Get a superblock - note that we may end up sharing one that already exists */ | |
958 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
959 | if (IS_ERR(s)) { | |
960 | error = PTR_ERR(s); | |
961 | goto out_err_nosb; | |
962 | } | |
963 | ||
964 | if (s->s_fs_info != server) { | |
965 | nfs_free_server(server); | |
966 | server = NULL; | |
967 | } | |
968 | ||
969 | if (!s->s_root) { | |
970 | /* initial superblock/root creation */ | |
971 | s->s_flags = flags; | |
972 | nfs4_clone_super(s, data->sb); | |
973 | } | |
974 | ||
975 | mntroot = nfs4_get_root(s, data->fh); | |
976 | if (IS_ERR(mntroot)) { | |
977 | error = PTR_ERR(mntroot); | |
978 | goto error_splat_super; | |
979 | } | |
980 | ||
981 | s->s_flags |= MS_ACTIVE; | |
982 | mnt->mnt_sb = s; | |
983 | mnt->mnt_root = mntroot; | |
984 | ||
985 | dprintk("<-- nfs4_xdev_get_sb() = 0\n"); | |
986 | return 0; | |
987 | ||
988 | out_err_nosb: | |
989 | nfs_free_server(server); | |
990 | out_err_noserver: | |
991 | dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); | |
992 | return error; | |
993 | ||
994 | error_splat_super: | |
995 | up_write(&s->s_umount); | |
996 | deactivate_super(s); | |
997 | dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); | |
998 | return error; | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Create an NFS4 server record on referral traversal | |
1003 | */ | |
1004 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, | |
1005 | const char *dev_name, void *raw_data, | |
1006 | struct vfsmount *mnt) | |
1007 | { | |
1008 | struct nfs_clone_mount *data = raw_data; | |
1009 | struct super_block *s; | |
1010 | struct nfs_server *server; | |
1011 | struct dentry *mntroot; | |
1012 | struct nfs_fh mntfh; | |
1013 | int error; | |
1014 | ||
1015 | dprintk("--> nfs4_referral_get_sb()\n"); | |
1016 | ||
1017 | /* create a new volume representation */ | |
1018 | server = nfs4_create_referral_server(data, &mntfh); | |
1019 | if (IS_ERR(server)) { | |
1020 | error = PTR_ERR(server); | |
1021 | goto out_err_noserver; | |
1022 | } | |
1023 | ||
1024 | /* Get a superblock - note that we may end up sharing one that already exists */ | |
1025 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
1026 | if (IS_ERR(s)) { | |
1027 | error = PTR_ERR(s); | |
1028 | goto out_err_nosb; | |
1029 | } | |
1030 | ||
1031 | if (s->s_fs_info != server) { | |
1032 | nfs_free_server(server); | |
1033 | server = NULL; | |
1034 | } | |
1035 | ||
1036 | if (!s->s_root) { | |
1037 | /* initial superblock/root creation */ | |
1038 | s->s_flags = flags; | |
1039 | nfs4_fill_super(s); | |
1040 | } | |
1041 | ||
1042 | mntroot = nfs4_get_root(s, &mntfh); | |
1043 | if (IS_ERR(mntroot)) { | |
1044 | error = PTR_ERR(mntroot); | |
1045 | goto error_splat_super; | |
1046 | } | |
1047 | ||
1048 | s->s_flags |= MS_ACTIVE; | |
1049 | mnt->mnt_sb = s; | |
1050 | mnt->mnt_root = mntroot; | |
1051 | ||
1052 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); | |
1053 | return 0; | |
1054 | ||
1055 | out_err_nosb: | |
1056 | nfs_free_server(server); | |
1057 | out_err_noserver: | |
1058 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); | |
1059 | return error; | |
1060 | ||
1061 | error_splat_super: | |
1062 | up_write(&s->s_umount); | |
1063 | deactivate_super(s); | |
1064 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); | |
1065 | return error; | |
1066 | } | |
1067 | ||
1068 | #endif /* CONFIG_NFS_V4 */ |