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f7b422b1 DH |
1 | /* |
2 | * linux/fs/nfs/super.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs superblock handling functions | |
7 | * | |
8 | * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some | |
9 | * experimental NFS changes. Modularisation taken straight from SYS5 fs. | |
10 | * | |
11 | * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. | |
12 | * J.S.Peatfield@damtp.cam.ac.uk | |
13 | * | |
14 | * Split from inode.c by David Howells <dhowells@redhat.com> | |
15 | * | |
54ceac45 DH |
16 | * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a |
17 | * particular server are held in the same superblock | |
18 | * - NFS superblocks can have several effective roots to the dentry tree | |
19 | * - directory type roots are spliced into the tree when a path from one root reaches the root | |
20 | * of another (see nfs_lookup()) | |
f7b422b1 DH |
21 | */ |
22 | ||
f7b422b1 DH |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> | |
25 | ||
26 | #include <linux/time.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/stat.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/unistd.h> | |
33 | #include <linux/sunrpc/clnt.h> | |
34 | #include <linux/sunrpc/stats.h> | |
35 | #include <linux/sunrpc/metrics.h> | |
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> | |
b5d5dfbd | 47 | #include <linux/magic.h> |
f7b422b1 DH |
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 | ||
f7b422b1 | 60 | static void nfs_umount_begin(struct vfsmount *, int); |
816724e6 | 61 | static int nfs_statfs(struct dentry *, struct kstatfs *); |
f7b422b1 DH |
62 | static int nfs_show_options(struct seq_file *, struct vfsmount *); |
63 | static int nfs_show_stats(struct seq_file *, struct vfsmount *); | |
816724e6 | 64 | static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); |
54ceac45 | 65 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, |
816724e6 | 66 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); |
f7b422b1 DH |
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, | |
349457cc | 74 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
75 | }; |
76 | ||
54ceac45 | 77 | struct file_system_type nfs_xdev_fs_type = { |
f7b422b1 DH |
78 | .owner = THIS_MODULE, |
79 | .name = "nfs", | |
54ceac45 | 80 | .get_sb = nfs_xdev_get_sb, |
f7b422b1 | 81 | .kill_sb = nfs_kill_super, |
349457cc | 82 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
83 | }; |
84 | ||
ee9b6d61 | 85 | static const struct super_operations nfs_sops = { |
f7b422b1 DH |
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 | |
816724e6 TM |
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); | |
54ceac45 DH |
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); | |
f7b422b1 DH |
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, | |
349457cc | 110 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
111 | }; |
112 | ||
54ceac45 | 113 | struct file_system_type nfs4_xdev_fs_type = { |
f7b422b1 DH |
114 | .owner = THIS_MODULE, |
115 | .name = "nfs4", | |
54ceac45 | 116 | .get_sb = nfs4_xdev_get_sb, |
f7b422b1 | 117 | .kill_sb = nfs4_kill_super, |
349457cc | 118 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
119 | }; |
120 | ||
54ceac45 | 121 | struct file_system_type nfs4_referral_fs_type = { |
f7b422b1 DH |
122 | .owner = THIS_MODULE, |
123 | .name = "nfs4", | |
54ceac45 | 124 | .get_sb = nfs4_referral_get_sb, |
f7b422b1 | 125 | .kill_sb = nfs4_kill_super, |
349457cc | 126 | .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, |
f7b422b1 DH |
127 | }; |
128 | ||
ee9b6d61 | 129 | static const struct super_operations nfs4_sops = { |
f7b422b1 DH |
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 | ||
979df72e TM |
141 | static struct shrinker *acl_shrinker; |
142 | ||
f7b422b1 DH |
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 | ||
f7b422b1 DH |
154 | ret = nfs_register_sysctl(); |
155 | if (ret < 0) | |
156 | goto error_1; | |
89a09141 | 157 | #ifdef CONFIG_NFS_V4 |
f7b422b1 DH |
158 | ret = register_filesystem(&nfs4_fs_type); |
159 | if (ret < 0) | |
160 | goto error_2; | |
161 | #endif | |
979df72e | 162 | acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker); |
f7b422b1 DH |
163 | return 0; |
164 | ||
165 | #ifdef CONFIG_NFS_V4 | |
166 | error_2: | |
167 | nfs_unregister_sysctl(); | |
89a09141 | 168 | #endif |
f7b422b1 DH |
169 | error_1: |
170 | unregister_filesystem(&nfs_fs_type); | |
f7b422b1 DH |
171 | error_0: |
172 | return ret; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Unregister the NFS filesystems | |
177 | */ | |
178 | void __exit unregister_nfs_fs(void) | |
179 | { | |
979df72e TM |
180 | if (acl_shrinker != NULL) |
181 | remove_shrinker(acl_shrinker); | |
f7b422b1 DH |
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 | */ | |
816724e6 | 192 | static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
f7b422b1 | 193 | { |
0c7d90cf | 194 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
f7b422b1 DH |
195 | unsigned char blockbits; |
196 | unsigned long blockres; | |
0c7d90cf | 197 | struct nfs_fh *fh = NFS_FH(dentry->d_inode); |
f7b422b1 DH |
198 | struct nfs_fattr fattr; |
199 | struct nfs_fsstat res = { | |
200 | .fattr = &fattr, | |
201 | }; | |
202 | int error; | |
203 | ||
204 | lock_kernel(); | |
205 | ||
8fa5c000 | 206 | error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
f7b422b1 DH |
207 | if (error < 0) |
208 | goto out_err; | |
1a0ba9ae | 209 | buf->f_type = NFS_SUPER_MAGIC; |
f7b422b1 DH |
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 | */ | |
0c7d90cf | 216 | buf->f_frsize = dentry->d_sb->s_blocksize; |
f7b422b1 DH |
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 | */ | |
0c7d90cf DH |
225 | buf->f_bsize = dentry->d_sb->s_blocksize; |
226 | blockbits = dentry->d_sb->s_blocksize_bits; | |
f7b422b1 DH |
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; | |
1a0ba9ae | 236 | |
f7b422b1 DH |
237 | unlock_kernel(); |
238 | return 0; | |
239 | ||
240 | out_err: | |
241 | dprintk("%s: statfs error = %d\n", __FUNCTION__, -error); | |
1a0ba9ae AA |
242 | unlock_kernel(); |
243 | return error; | |
f7b422b1 DH |
244 | } |
245 | ||
7d4e2747 DH |
246 | /* |
247 | * Map the security flavour number to a name | |
248 | */ | |
81039f1f TM |
249 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
250 | { | |
7d4e2747 | 251 | static const struct { |
81039f1f TM |
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" }, | |
4d81cd16 | 266 | { UINT_MAX, "unknown" } |
81039f1f TM |
267 | }; |
268 | int i; | |
269 | ||
4d81cd16 | 270 | for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
81039f1f TM |
271 | if (sec_flavours[i].flavour == flavour) |
272 | break; | |
273 | } | |
274 | return sec_flavours[i].str; | |
275 | } | |
276 | ||
f7b422b1 DH |
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 | { | |
509de811 | 282 | static const struct proc_nfs_info { |
f7b422b1 | 283 | int flag; |
509de811 DH |
284 | const char *str; |
285 | const char *nostr; | |
f7b422b1 DH |
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", "" }, | |
74dd34e6 | 293 | { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
f7b422b1 DH |
294 | { 0, NULL, NULL } |
295 | }; | |
509de811 | 296 | const struct proc_nfs_info *nfs_infop; |
8fa5c000 | 297 | struct nfs_client *clp = nfss->nfs_client; |
f7b422b1 | 298 | char buf[12]; |
509de811 | 299 | const char *proto; |
f7b422b1 | 300 | |
8fa5c000 | 301 | seq_printf(m, ",vers=%d", clp->rpc_ops->version); |
f7b422b1 DH |
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); | |
5006a76c DH |
330 | seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ); |
331 | seq_printf(m, ",retrans=%u", clp->retrans_count); | |
81039f1f | 332 | seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
f7b422b1 DH |
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="); | |
54ceac45 | 345 | seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\"); |
f7b422b1 DH |
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 | |
8fa5c000 | 382 | if (nfss->nfs_client->cl_nfsversion == 4) { |
f7b422b1 DH |
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 | |
54ceac45 | 429 | * in response to xdev traversals and referrals |
f7b422b1 DH |
430 | */ |
431 | static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags) | |
432 | { | |
fc6ae3cf TM |
433 | struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb); |
434 | struct rpc_clnt *rpc; | |
435 | ||
f7b422b1 | 436 | shrink_submounts(vfsmnt, &nfs_automount_list); |
fc6ae3cf TM |
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); | |
f7b422b1 DH |
447 | } |
448 | ||
fc50d58f CL |
449 | /* |
450 | * Sanity-check a server address provided by the mount command | |
451 | */ | |
452 | static int nfs_verify_server_address(struct sockaddr *addr) | |
453 | { | |
454 | switch (addr->sa_family) { | |
455 | case AF_INET: { | |
456 | struct sockaddr_in *sa = (struct sockaddr_in *) addr; | |
457 | if (sa->sin_addr.s_addr != INADDR_ANY) | |
458 | return 1; | |
459 | break; | |
460 | } | |
461 | } | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
f7b422b1 | 466 | /* |
54ceac45 DH |
467 | * Validate the NFS2/NFS3 mount data |
468 | * - fills in the mount root filehandle | |
f7b422b1 | 469 | */ |
54ceac45 DH |
470 | static int nfs_validate_mount_data(struct nfs_mount_data *data, |
471 | struct nfs_fh *mntfh) | |
f7b422b1 | 472 | { |
5df36e78 CL |
473 | if (data == NULL) |
474 | goto out_no_data; | |
f7b422b1 | 475 | |
54ceac45 | 476 | switch (data->version) { |
5df36e78 CL |
477 | case 1: |
478 | data->namlen = 0; | |
479 | case 2: | |
480 | data->bsize = 0; | |
481 | case 3: | |
482 | if (data->flags & NFS_MOUNT_VER3) | |
483 | goto out_no_v3; | |
484 | data->root.size = NFS2_FHSIZE; | |
485 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
486 | case 4: | |
487 | if (data->flags & NFS_MOUNT_SECFLAVOUR) | |
488 | goto out_no_sec; | |
489 | case 5: | |
490 | memset(data->context, 0, sizeof(data->context)); | |
491 | case 6: | |
492 | if (data->flags & NFS_MOUNT_VER3) | |
493 | mntfh->size = data->root.size; | |
494 | else | |
495 | mntfh->size = NFS2_FHSIZE; | |
496 | ||
497 | if (mntfh->size > sizeof(mntfh->data)) | |
498 | goto out_invalid_fh; | |
499 | ||
500 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
501 | if (mntfh->size < sizeof(mntfh->data)) | |
502 | memset(mntfh->data + mntfh->size, 0, | |
503 | sizeof(mntfh->data) - mntfh->size); | |
504 | break; | |
505 | default: | |
506 | goto out_bad_version; | |
f7b422b1 | 507 | } |
54ceac45 | 508 | |
36b15c54 TM |
509 | if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) |
510 | data->pseudoflavor = RPC_AUTH_UNIX; | |
511 | ||
54ceac45 | 512 | #ifndef CONFIG_NFS_V3 |
5df36e78 CL |
513 | if (data->flags & NFS_MOUNT_VER3) |
514 | goto out_v3_not_compiled; | |
515 | #endif /* !CONFIG_NFS_V3 */ | |
f7b422b1 | 516 | |
5df36e78 CL |
517 | if (!nfs_verify_server_address((struct sockaddr *) &data->addr)) |
518 | goto out_no_address; | |
f7b422b1 | 519 | |
5df36e78 | 520 | return 0; |
f7b422b1 | 521 | |
5df36e78 CL |
522 | out_no_data: |
523 | dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n"); | |
524 | return -EINVAL; | |
54ceac45 | 525 | |
5df36e78 CL |
526 | out_no_v3: |
527 | dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n", | |
528 | data->version); | |
529 | return -EINVAL; | |
f7b422b1 | 530 | |
5df36e78 CL |
531 | out_no_sec: |
532 | dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); | |
533 | return -EINVAL; | |
534 | ||
535 | out_bad_version: | |
536 | dfprintk(MOUNT, "NFS: bad nfs_mount_data version %d\n", | |
537 | data->version); | |
538 | return -EINVAL; | |
539 | ||
540 | #ifndef CONFIG_NFS_V3 | |
541 | out_v3_not_compiled: | |
542 | dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); | |
543 | return -EPROTONOSUPPORT; | |
544 | #endif /* !CONFIG_NFS_V3 */ | |
545 | ||
546 | out_no_address: | |
547 | dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n"); | |
548 | return -EINVAL; | |
549 | ||
550 | out_invalid_fh: | |
551 | dfprintk(MOUNT, "NFS: invalid root filehandle\n"); | |
552 | return -EINVAL; | |
f7b422b1 DH |
553 | } |
554 | ||
f7b422b1 | 555 | /* |
54ceac45 | 556 | * Initialise the common bits of the superblock |
f7b422b1 | 557 | */ |
54ceac45 | 558 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 559 | { |
54ceac45 | 560 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 561 | |
54ceac45 | 562 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 563 | |
54ceac45 DH |
564 | /* We probably want something more informative here */ |
565 | snprintf(sb->s_id, sizeof(sb->s_id), | |
566 | "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
5006a76c | 567 | |
54ceac45 DH |
568 | if (sb->s_blocksize == 0) |
569 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
570 | &sb->s_blocksize_bits); | |
f7b422b1 | 571 | |
54ceac45 DH |
572 | if (server->flags & NFS_MOUNT_NOAC) |
573 | sb->s_flags |= MS_SYNCHRONOUS; | |
f7b422b1 | 574 | |
54ceac45 | 575 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
576 | } |
577 | ||
578 | /* | |
54ceac45 | 579 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 580 | */ |
54ceac45 | 581 | static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data) |
f7b422b1 DH |
582 | { |
583 | struct nfs_server *server = NFS_SB(sb); | |
5006a76c | 584 | |
54ceac45 DH |
585 | sb->s_blocksize_bits = 0; |
586 | sb->s_blocksize = 0; | |
587 | if (data->bsize) | |
588 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 589 | |
54ceac45 DH |
590 | if (server->flags & NFS_MOUNT_VER3) { |
591 | /* The VFS shouldn't apply the umask to mode bits. We will do | |
592 | * so ourselves when necessary. | |
593 | */ | |
594 | sb->s_flags |= MS_POSIXACL; | |
595 | sb->s_time_gran = 1; | |
816724e6 | 596 | } |
54ceac45 DH |
597 | |
598 | sb->s_op = &nfs_sops; | |
599 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
600 | } |
601 | ||
602 | /* | |
54ceac45 | 603 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 604 | */ |
54ceac45 DH |
605 | static void nfs_clone_super(struct super_block *sb, |
606 | const struct super_block *old_sb) | |
f7b422b1 | 607 | { |
54ceac45 DH |
608 | struct nfs_server *server = NFS_SB(sb); |
609 | ||
610 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
611 | sb->s_blocksize = old_sb->s_blocksize; | |
612 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 613 | |
f7b422b1 | 614 | if (server->flags & NFS_MOUNT_VER3) { |
54ceac45 DH |
615 | /* The VFS shouldn't apply the umask to mode bits. We will do |
616 | * so ourselves when necessary. | |
f7b422b1 DH |
617 | */ |
618 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 619 | sb->s_time_gran = 1; |
f7b422b1 DH |
620 | } |
621 | ||
54ceac45 DH |
622 | sb->s_op = old_sb->s_op; |
623 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
624 | } |
625 | ||
54ceac45 | 626 | static int nfs_set_super(struct super_block *s, void *_server) |
f7b422b1 | 627 | { |
54ceac45 DH |
628 | struct nfs_server *server = _server; |
629 | int ret; | |
630 | ||
631 | s->s_fs_info = server; | |
632 | ret = set_anon_super(s, server); | |
633 | if (ret == 0) | |
634 | server->s_dev = s->s_dev; | |
635 | return ret; | |
f7b422b1 DH |
636 | } |
637 | ||
638 | static int nfs_compare_super(struct super_block *sb, void *data) | |
639 | { | |
54ceac45 | 640 | struct nfs_server *server = data, *old = NFS_SB(sb); |
f7b422b1 | 641 | |
54ceac45 | 642 | if (old->nfs_client != server->nfs_client) |
f7b422b1 | 643 | return 0; |
54ceac45 | 644 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) |
f7b422b1 | 645 | return 0; |
54ceac45 | 646 | return 1; |
f7b422b1 DH |
647 | } |
648 | ||
816724e6 TM |
649 | static int nfs_get_sb(struct file_system_type *fs_type, |
650 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 651 | { |
f7b422b1 DH |
652 | struct nfs_server *server = NULL; |
653 | struct super_block *s; | |
54ceac45 | 654 | struct nfs_fh mntfh; |
f7b422b1 | 655 | struct nfs_mount_data *data = raw_data; |
54ceac45 DH |
656 | struct dentry *mntroot; |
657 | int error; | |
f7b422b1 | 658 | |
54ceac45 DH |
659 | /* Validate the mount data */ |
660 | error = nfs_validate_mount_data(data, &mntfh); | |
661 | if (error < 0) | |
0655960f | 662 | goto out; |
f7b422b1 | 663 | |
54ceac45 DH |
664 | /* Get a volume representation */ |
665 | server = nfs_create_server(data, &mntfh); | |
666 | if (IS_ERR(server)) { | |
667 | error = PTR_ERR(server); | |
0655960f | 668 | goto out; |
f7b422b1 DH |
669 | } |
670 | ||
54ceac45 | 671 | /* Get a superblock - note that we may end up sharing one that already exists */ |
f7b422b1 | 672 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); |
816724e6 TM |
673 | if (IS_ERR(s)) { |
674 | error = PTR_ERR(s); | |
54ceac45 | 675 | goto out_err_nosb; |
816724e6 TM |
676 | } |
677 | ||
54ceac45 DH |
678 | if (s->s_fs_info != server) { |
679 | nfs_free_server(server); | |
680 | server = NULL; | |
681 | } | |
f7b422b1 | 682 | |
54ceac45 DH |
683 | if (!s->s_root) { |
684 | /* initial superblock/root creation */ | |
685 | s->s_flags = flags; | |
686 | nfs_fill_super(s, data); | |
687 | } | |
f7b422b1 | 688 | |
54ceac45 DH |
689 | mntroot = nfs_get_root(s, &mntfh); |
690 | if (IS_ERR(mntroot)) { | |
691 | error = PTR_ERR(mntroot); | |
692 | goto error_splat_super; | |
f7b422b1 | 693 | } |
816724e6 | 694 | |
54ceac45 DH |
695 | s->s_flags |= MS_ACTIVE; |
696 | mnt->mnt_sb = s; | |
697 | mnt->mnt_root = mntroot; | |
0655960f CL |
698 | error = 0; |
699 | ||
700 | out: | |
701 | return error; | |
816724e6 | 702 | |
54ceac45 DH |
703 | out_err_nosb: |
704 | nfs_free_server(server); | |
0655960f | 705 | goto out; |
54ceac45 DH |
706 | |
707 | error_splat_super: | |
708 | up_write(&s->s_umount); | |
709 | deactivate_super(s); | |
0655960f | 710 | goto out; |
f7b422b1 DH |
711 | } |
712 | ||
54ceac45 DH |
713 | /* |
714 | * Destroy an NFS2/3 superblock | |
715 | */ | |
f7b422b1 DH |
716 | static void nfs_kill_super(struct super_block *s) |
717 | { | |
718 | struct nfs_server *server = NFS_SB(s); | |
719 | ||
720 | kill_anon_super(s); | |
54ceac45 | 721 | nfs_free_server(server); |
f7b422b1 DH |
722 | } |
723 | ||
54ceac45 DH |
724 | /* |
725 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
726 | */ | |
727 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, | |
728 | const char *dev_name, void *raw_data, | |
729 | struct vfsmount *mnt) | |
f7b422b1 DH |
730 | { |
731 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
732 | struct super_block *s; |
733 | struct nfs_server *server; | |
734 | struct dentry *mntroot; | |
735 | int error; | |
f7b422b1 | 736 | |
54ceac45 | 737 | dprintk("--> nfs_xdev_get_sb()\n"); |
f7b422b1 | 738 | |
54ceac45 DH |
739 | /* create a new volume representation */ |
740 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
741 | if (IS_ERR(server)) { | |
742 | error = PTR_ERR(server); | |
743 | goto out_err_noserver; | |
744 | } | |
8fa5c000 | 745 | |
54ceac45 DH |
746 | /* Get a superblock - note that we may end up sharing one that already exists */ |
747 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
748 | if (IS_ERR(s)) { | |
749 | error = PTR_ERR(s); | |
750 | goto out_err_nosb; | |
751 | } | |
5006a76c | 752 | |
54ceac45 DH |
753 | if (s->s_fs_info != server) { |
754 | nfs_free_server(server); | |
755 | server = NULL; | |
f7b422b1 | 756 | } |
24c8dbbb | 757 | |
54ceac45 DH |
758 | if (!s->s_root) { |
759 | /* initial superblock/root creation */ | |
760 | s->s_flags = flags; | |
761 | nfs_clone_super(s, data->sb); | |
762 | } | |
f7b422b1 | 763 | |
54ceac45 DH |
764 | mntroot = nfs_get_root(s, data->fh); |
765 | if (IS_ERR(mntroot)) { | |
766 | error = PTR_ERR(mntroot); | |
767 | goto error_splat_super; | |
f7b422b1 DH |
768 | } |
769 | ||
54ceac45 DH |
770 | s->s_flags |= MS_ACTIVE; |
771 | mnt->mnt_sb = s; | |
772 | mnt->mnt_root = mntroot; | |
f7b422b1 | 773 | |
54ceac45 DH |
774 | dprintk("<-- nfs_xdev_get_sb() = 0\n"); |
775 | return 0; | |
24c8dbbb | 776 | |
54ceac45 DH |
777 | out_err_nosb: |
778 | nfs_free_server(server); | |
779 | out_err_noserver: | |
780 | dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); | |
781 | return error; | |
f7b422b1 | 782 | |
54ceac45 DH |
783 | error_splat_super: |
784 | up_write(&s->s_umount); | |
785 | deactivate_super(s); | |
786 | dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); | |
787 | return error; | |
f7b422b1 DH |
788 | } |
789 | ||
54ceac45 DH |
790 | #ifdef CONFIG_NFS_V4 |
791 | ||
f7b422b1 | 792 | /* |
54ceac45 | 793 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 794 | */ |
54ceac45 DH |
795 | static void nfs4_clone_super(struct super_block *sb, |
796 | const struct super_block *old_sb) | |
f7b422b1 | 797 | { |
54ceac45 DH |
798 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
799 | sb->s_blocksize = old_sb->s_blocksize; | |
800 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 801 | sb->s_time_gran = 1; |
54ceac45 DH |
802 | sb->s_op = old_sb->s_op; |
803 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
804 | } |
805 | ||
54ceac45 DH |
806 | /* |
807 | * Set up an NFS4 superblock | |
808 | */ | |
809 | static void nfs4_fill_super(struct super_block *sb) | |
f7b422b1 | 810 | { |
54ceac45 DH |
811 | sb->s_time_gran = 1; |
812 | sb->s_op = &nfs4_sops; | |
813 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
814 | } |
815 | ||
f0768ebd CL |
816 | /* |
817 | * Validate NFSv4 mount options | |
818 | */ | |
819 | static int nfs4_validate_mount_data(struct nfs4_mount_data **options, | |
820 | const char *dev_name, | |
821 | struct sockaddr_in *addr, | |
822 | rpc_authflavor_t *authflavour, | |
823 | char **hostname, | |
824 | char **mntpath, | |
825 | char **ip_addr) | |
826 | { | |
827 | struct nfs4_mount_data *data = *options; | |
828 | char *c; | |
829 | ||
830 | if (data == NULL) | |
831 | goto out_no_data; | |
832 | ||
833 | switch (data->version) { | |
834 | case 1: | |
835 | if (data->host_addrlen != sizeof(*addr)) | |
836 | goto out_no_address; | |
837 | if (copy_from_user(addr, data->host_addr, sizeof(*addr))) | |
838 | return -EFAULT; | |
839 | if (addr->sin_port == 0) | |
840 | addr->sin_port = htons(NFS_PORT); | |
841 | if (!nfs_verify_server_address((struct sockaddr *) addr)) | |
842 | goto out_no_address; | |
843 | ||
844 | switch (data->auth_flavourlen) { | |
845 | case 0: | |
846 | *authflavour = RPC_AUTH_UNIX; | |
847 | break; | |
848 | case 1: | |
849 | if (copy_from_user(authflavour, data->auth_flavours, | |
850 | sizeof(*authflavour))) | |
851 | return -EFAULT; | |
852 | break; | |
853 | default: | |
854 | goto out_inval_auth; | |
855 | } | |
856 | ||
857 | c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); | |
858 | if (IS_ERR(c)) | |
859 | return PTR_ERR(c); | |
860 | *hostname = c; | |
861 | ||
862 | c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); | |
863 | if (IS_ERR(c)) | |
864 | return PTR_ERR(c); | |
865 | *mntpath = c; | |
866 | dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *mntpath); | |
867 | ||
868 | c = strndup_user(data->client_addr.data, 16); | |
869 | if (IS_ERR(c)) | |
870 | return PTR_ERR(c); | |
871 | *ip_addr = c; | |
872 | ||
873 | break; | |
874 | default: | |
875 | goto out_bad_version; | |
876 | } | |
877 | ||
878 | return 0; | |
879 | ||
880 | out_no_data: | |
881 | dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); | |
882 | return -EINVAL; | |
883 | ||
884 | out_inval_auth: | |
885 | dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", | |
886 | data->auth_flavourlen); | |
887 | return -EINVAL; | |
888 | ||
889 | out_no_address: | |
890 | dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); | |
891 | return -EINVAL; | |
892 | ||
893 | out_bad_version: | |
894 | dfprintk(MOUNT, "NFS4: bad nfs_mount_data version %d\n", | |
895 | data->version); | |
896 | return -EINVAL; | |
897 | } | |
898 | ||
54ceac45 DH |
899 | /* |
900 | * Get the superblock for an NFS4 mountpoint | |
901 | */ | |
816724e6 TM |
902 | static int nfs4_get_sb(struct file_system_type *fs_type, |
903 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 904 | { |
f7b422b1 | 905 | struct nfs4_mount_data *data = raw_data; |
54ceac45 DH |
906 | struct super_block *s; |
907 | struct nfs_server *server; | |
908 | struct sockaddr_in addr; | |
909 | rpc_authflavor_t authflavour; | |
910 | struct nfs_fh mntfh; | |
911 | struct dentry *mntroot; | |
f0768ebd | 912 | char *mntpath = NULL, *hostname = NULL, *ip_addr = NULL; |
54ceac45 | 913 | int error; |
f7b422b1 | 914 | |
f0768ebd CL |
915 | /* Validate the mount data */ |
916 | error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour, | |
917 | &hostname, &mntpath, &ip_addr); | |
918 | if (error < 0) | |
919 | goto out; | |
f7b422b1 | 920 | |
54ceac45 DH |
921 | /* Get a volume representation */ |
922 | server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr, | |
923 | authflavour, &mntfh); | |
924 | if (IS_ERR(server)) { | |
925 | error = PTR_ERR(server); | |
29eb981a | 926 | goto out; |
f7b422b1 DH |
927 | } |
928 | ||
54ceac45 DH |
929 | /* Get a superblock - note that we may end up sharing one that already exists */ |
930 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); | |
816724e6 TM |
931 | if (IS_ERR(s)) { |
932 | error = PTR_ERR(s); | |
f7b422b1 | 933 | goto out_free; |
816724e6 TM |
934 | } |
935 | ||
5dd3177a TM |
936 | if (s->s_fs_info != server) { |
937 | nfs_free_server(server); | |
938 | server = NULL; | |
939 | } | |
940 | ||
54ceac45 DH |
941 | if (!s->s_root) { |
942 | /* initial superblock/root creation */ | |
943 | s->s_flags = flags; | |
54ceac45 | 944 | nfs4_fill_super(s); |
54ceac45 | 945 | } |
f7b422b1 | 946 | |
54ceac45 DH |
947 | mntroot = nfs4_get_root(s, &mntfh); |
948 | if (IS_ERR(mntroot)) { | |
949 | error = PTR_ERR(mntroot); | |
950 | goto error_splat_super; | |
f7b422b1 | 951 | } |
54ceac45 | 952 | |
f7b422b1 | 953 | s->s_flags |= MS_ACTIVE; |
54ceac45 DH |
954 | mnt->mnt_sb = s; |
955 | mnt->mnt_root = mntroot; | |
29eb981a CL |
956 | error = 0; |
957 | ||
958 | out: | |
959 | kfree(ip_addr); | |
54ceac45 DH |
960 | kfree(mntpath); |
961 | kfree(hostname); | |
29eb981a | 962 | return error; |
54ceac45 | 963 | |
f7b422b1 | 964 | out_free: |
54ceac45 | 965 | nfs_free_server(server); |
29eb981a | 966 | goto out; |
54ceac45 DH |
967 | |
968 | error_splat_super: | |
969 | up_write(&s->s_umount); | |
970 | deactivate_super(s); | |
29eb981a | 971 | goto out; |
f7b422b1 DH |
972 | } |
973 | ||
974 | static void nfs4_kill_super(struct super_block *sb) | |
975 | { | |
976 | struct nfs_server *server = NFS_SB(sb); | |
977 | ||
978 | nfs_return_all_delegations(sb); | |
979 | kill_anon_super(sb); | |
980 | ||
981 | nfs4_renewd_prepare_shutdown(server); | |
54ceac45 | 982 | nfs_free_server(server); |
f7b422b1 DH |
983 | } |
984 | ||
985 | /* | |
54ceac45 | 986 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 987 | */ |
54ceac45 DH |
988 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, |
989 | const char *dev_name, void *raw_data, | |
990 | struct vfsmount *mnt) | |
f7b422b1 | 991 | { |
54ceac45 DH |
992 | struct nfs_clone_mount *data = raw_data; |
993 | struct super_block *s; | |
994 | struct nfs_server *server; | |
995 | struct dentry *mntroot; | |
996 | int error; | |
f7b422b1 | 997 | |
54ceac45 | 998 | dprintk("--> nfs4_xdev_get_sb()\n"); |
f7b422b1 | 999 | |
54ceac45 DH |
1000 | /* create a new volume representation */ |
1001 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
1002 | if (IS_ERR(server)) { | |
1003 | error = PTR_ERR(server); | |
1004 | goto out_err_noserver; | |
f7b422b1 | 1005 | } |
f7b422b1 | 1006 | |
54ceac45 DH |
1007 | /* Get a superblock - note that we may end up sharing one that already exists */ |
1008 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
1009 | if (IS_ERR(s)) { | |
1010 | error = PTR_ERR(s); | |
1011 | goto out_err_nosb; | |
f7b422b1 | 1012 | } |
f7b422b1 | 1013 | |
54ceac45 DH |
1014 | if (s->s_fs_info != server) { |
1015 | nfs_free_server(server); | |
1016 | server = NULL; | |
1017 | } | |
f7b422b1 | 1018 | |
54ceac45 DH |
1019 | if (!s->s_root) { |
1020 | /* initial superblock/root creation */ | |
1021 | s->s_flags = flags; | |
1022 | nfs4_clone_super(s, data->sb); | |
1023 | } | |
f7b422b1 | 1024 | |
54ceac45 DH |
1025 | mntroot = nfs4_get_root(s, data->fh); |
1026 | if (IS_ERR(mntroot)) { | |
1027 | error = PTR_ERR(mntroot); | |
1028 | goto error_splat_super; | |
1029 | } | |
f7b422b1 | 1030 | |
54ceac45 DH |
1031 | s->s_flags |= MS_ACTIVE; |
1032 | mnt->mnt_sb = s; | |
1033 | mnt->mnt_root = mntroot; | |
1034 | ||
1035 | dprintk("<-- nfs4_xdev_get_sb() = 0\n"); | |
1036 | return 0; | |
1037 | ||
1038 | out_err_nosb: | |
1039 | nfs_free_server(server); | |
1040 | out_err_noserver: | |
1041 | dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); | |
1042 | return error; | |
1043 | ||
1044 | error_splat_super: | |
1045 | up_write(&s->s_umount); | |
1046 | deactivate_super(s); | |
1047 | dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); | |
1048 | return error; | |
f7b422b1 DH |
1049 | } |
1050 | ||
54ceac45 DH |
1051 | /* |
1052 | * Create an NFS4 server record on referral traversal | |
1053 | */ | |
1054 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, | |
1055 | const char *dev_name, void *raw_data, | |
1056 | struct vfsmount *mnt) | |
f7b422b1 DH |
1057 | { |
1058 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
1059 | struct super_block *s; |
1060 | struct nfs_server *server; | |
1061 | struct dentry *mntroot; | |
1062 | struct nfs_fh mntfh; | |
1063 | int error; | |
1064 | ||
1065 | dprintk("--> nfs4_referral_get_sb()\n"); | |
1066 | ||
1067 | /* create a new volume representation */ | |
1068 | server = nfs4_create_referral_server(data, &mntfh); | |
1069 | if (IS_ERR(server)) { | |
1070 | error = PTR_ERR(server); | |
1071 | goto out_err_noserver; | |
1072 | } | |
1073 | ||
1074 | /* Get a superblock - note that we may end up sharing one that already exists */ | |
1075 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
1076 | if (IS_ERR(s)) { | |
1077 | error = PTR_ERR(s); | |
1078 | goto out_err_nosb; | |
1079 | } | |
1080 | ||
1081 | if (s->s_fs_info != server) { | |
1082 | nfs_free_server(server); | |
1083 | server = NULL; | |
1084 | } | |
1085 | ||
1086 | if (!s->s_root) { | |
1087 | /* initial superblock/root creation */ | |
1088 | s->s_flags = flags; | |
1089 | nfs4_fill_super(s); | |
1090 | } | |
1091 | ||
f2d0d85e | 1092 | mntroot = nfs4_get_root(s, &mntfh); |
54ceac45 DH |
1093 | if (IS_ERR(mntroot)) { |
1094 | error = PTR_ERR(mntroot); | |
1095 | goto error_splat_super; | |
1096 | } | |
1097 | ||
1098 | s->s_flags |= MS_ACTIVE; | |
1099 | mnt->mnt_sb = s; | |
1100 | mnt->mnt_root = mntroot; | |
1101 | ||
1102 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); | |
1103 | return 0; | |
1104 | ||
1105 | out_err_nosb: | |
1106 | nfs_free_server(server); | |
1107 | out_err_noserver: | |
1108 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); | |
1109 | return error; | |
1110 | ||
1111 | error_splat_super: | |
1112 | up_write(&s->s_umount); | |
1113 | deactivate_super(s); | |
1114 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); | |
1115 | return error; | |
f7b422b1 DH |
1116 | } |
1117 | ||
54ceac45 | 1118 | #endif /* CONFIG_NFS_V4 */ |