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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" }, | |
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 | ||
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 | { | |
f7b422b1 | 433 | shrink_submounts(vfsmnt, &nfs_automount_list); |
f7b422b1 DH |
434 | } |
435 | ||
436 | /* | |
54ceac45 DH |
437 | * Validate the NFS2/NFS3 mount data |
438 | * - fills in the mount root filehandle | |
f7b422b1 | 439 | */ |
54ceac45 DH |
440 | static int nfs_validate_mount_data(struct nfs_mount_data *data, |
441 | struct nfs_fh *mntfh) | |
f7b422b1 | 442 | { |
54ceac45 DH |
443 | if (data == NULL) { |
444 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
445 | return -EINVAL; | |
f7b422b1 DH |
446 | } |
447 | ||
54ceac45 DH |
448 | if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) { |
449 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
450 | return -EINVAL; | |
451 | } | |
f7b422b1 | 452 | |
54ceac45 DH |
453 | switch (data->version) { |
454 | case 1: | |
455 | data->namlen = 0; | |
456 | case 2: | |
457 | data->bsize = 0; | |
458 | case 3: | |
459 | if (data->flags & NFS_MOUNT_VER3) { | |
460 | dprintk("%s: mount structure version %d does not support NFSv3\n", | |
461 | __FUNCTION__, | |
462 | data->version); | |
463 | return -EINVAL; | |
464 | } | |
465 | data->root.size = NFS2_FHSIZE; | |
466 | memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); | |
467 | case 4: | |
468 | if (data->flags & NFS_MOUNT_SECFLAVOUR) { | |
469 | dprintk("%s: mount structure version %d does not support strong security\n", | |
470 | __FUNCTION__, | |
471 | data->version); | |
472 | return -EINVAL; | |
473 | } | |
54ceac45 DH |
474 | case 5: |
475 | memset(data->context, 0, sizeof(data->context)); | |
f7b422b1 | 476 | } |
54ceac45 | 477 | |
36b15c54 TM |
478 | /* Set the pseudoflavor */ |
479 | if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) | |
480 | data->pseudoflavor = RPC_AUTH_UNIX; | |
481 | ||
54ceac45 DH |
482 | #ifndef CONFIG_NFS_V3 |
483 | /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ | |
484 | if (data->flags & NFS_MOUNT_VER3) { | |
485 | dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); | |
486 | return -EPROTONOSUPPORT; | |
f7b422b1 | 487 | } |
54ceac45 | 488 | #endif /* CONFIG_NFS_V3 */ |
f7b422b1 | 489 | |
54ceac45 DH |
490 | /* We now require that the mount process passes the remote address */ |
491 | if (data->addr.sin_addr.s_addr == INADDR_ANY) { | |
492 | dprintk("%s: mount program didn't pass remote address!\n", | |
493 | __FUNCTION__); | |
494 | return -EINVAL; | |
f7b422b1 | 495 | } |
f7b422b1 | 496 | |
54ceac45 DH |
497 | /* Prepare the root filehandle */ |
498 | if (data->flags & NFS_MOUNT_VER3) | |
499 | mntfh->size = data->root.size; | |
500 | else | |
501 | mntfh->size = NFS2_FHSIZE; | |
f7b422b1 | 502 | |
54ceac45 DH |
503 | if (mntfh->size > sizeof(mntfh->data)) { |
504 | dprintk("%s: invalid root filehandle\n", __FUNCTION__); | |
505 | return -EINVAL; | |
506 | } | |
507 | ||
508 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
509 | if (mntfh->size < sizeof(mntfh->data)) | |
510 | memset(mntfh->data + mntfh->size, 0, | |
511 | sizeof(mntfh->data) - mntfh->size); | |
f7b422b1 | 512 | |
f7b422b1 | 513 | return 0; |
f7b422b1 DH |
514 | } |
515 | ||
f7b422b1 | 516 | /* |
54ceac45 | 517 | * Initialise the common bits of the superblock |
f7b422b1 | 518 | */ |
54ceac45 | 519 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 520 | { |
54ceac45 | 521 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 522 | |
54ceac45 | 523 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 524 | |
54ceac45 DH |
525 | /* We probably want something more informative here */ |
526 | snprintf(sb->s_id, sizeof(sb->s_id), | |
527 | "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
5006a76c | 528 | |
54ceac45 DH |
529 | if (sb->s_blocksize == 0) |
530 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
531 | &sb->s_blocksize_bits); | |
f7b422b1 | 532 | |
54ceac45 DH |
533 | if (server->flags & NFS_MOUNT_NOAC) |
534 | sb->s_flags |= MS_SYNCHRONOUS; | |
f7b422b1 | 535 | |
54ceac45 | 536 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
537 | } |
538 | ||
539 | /* | |
54ceac45 | 540 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 541 | */ |
54ceac45 | 542 | static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data) |
f7b422b1 DH |
543 | { |
544 | struct nfs_server *server = NFS_SB(sb); | |
5006a76c | 545 | |
54ceac45 DH |
546 | sb->s_blocksize_bits = 0; |
547 | sb->s_blocksize = 0; | |
548 | if (data->bsize) | |
549 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 550 | |
54ceac45 DH |
551 | if (server->flags & NFS_MOUNT_VER3) { |
552 | /* The VFS shouldn't apply the umask to mode bits. We will do | |
553 | * so ourselves when necessary. | |
554 | */ | |
555 | sb->s_flags |= MS_POSIXACL; | |
556 | sb->s_time_gran = 1; | |
816724e6 | 557 | } |
54ceac45 DH |
558 | |
559 | sb->s_op = &nfs_sops; | |
560 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
561 | } |
562 | ||
563 | /* | |
54ceac45 | 564 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 565 | */ |
54ceac45 DH |
566 | static void nfs_clone_super(struct super_block *sb, |
567 | const struct super_block *old_sb) | |
f7b422b1 | 568 | { |
54ceac45 DH |
569 | struct nfs_server *server = NFS_SB(sb); |
570 | ||
571 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
572 | sb->s_blocksize = old_sb->s_blocksize; | |
573 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 574 | |
f7b422b1 | 575 | if (server->flags & NFS_MOUNT_VER3) { |
54ceac45 DH |
576 | /* The VFS shouldn't apply the umask to mode bits. We will do |
577 | * so ourselves when necessary. | |
f7b422b1 DH |
578 | */ |
579 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 580 | sb->s_time_gran = 1; |
f7b422b1 DH |
581 | } |
582 | ||
54ceac45 DH |
583 | sb->s_op = old_sb->s_op; |
584 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
585 | } |
586 | ||
54ceac45 | 587 | static int nfs_set_super(struct super_block *s, void *_server) |
f7b422b1 | 588 | { |
54ceac45 DH |
589 | struct nfs_server *server = _server; |
590 | int ret; | |
591 | ||
592 | s->s_fs_info = server; | |
593 | ret = set_anon_super(s, server); | |
594 | if (ret == 0) | |
595 | server->s_dev = s->s_dev; | |
596 | return ret; | |
f7b422b1 DH |
597 | } |
598 | ||
599 | static int nfs_compare_super(struct super_block *sb, void *data) | |
600 | { | |
54ceac45 | 601 | struct nfs_server *server = data, *old = NFS_SB(sb); |
f7b422b1 | 602 | |
54ceac45 | 603 | if (old->nfs_client != server->nfs_client) |
f7b422b1 | 604 | return 0; |
54ceac45 | 605 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) |
f7b422b1 | 606 | return 0; |
54ceac45 | 607 | return 1; |
f7b422b1 DH |
608 | } |
609 | ||
816724e6 TM |
610 | static int nfs_get_sb(struct file_system_type *fs_type, |
611 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 612 | { |
f7b422b1 DH |
613 | struct nfs_server *server = NULL; |
614 | struct super_block *s; | |
54ceac45 | 615 | struct nfs_fh mntfh; |
f7b422b1 | 616 | struct nfs_mount_data *data = raw_data; |
54ceac45 DH |
617 | struct dentry *mntroot; |
618 | int error; | |
f7b422b1 | 619 | |
54ceac45 DH |
620 | /* Validate the mount data */ |
621 | error = nfs_validate_mount_data(data, &mntfh); | |
622 | if (error < 0) | |
623 | return error; | |
f7b422b1 | 624 | |
54ceac45 DH |
625 | /* Get a volume representation */ |
626 | server = nfs_create_server(data, &mntfh); | |
627 | if (IS_ERR(server)) { | |
628 | error = PTR_ERR(server); | |
816724e6 | 629 | goto out_err_noserver; |
f7b422b1 DH |
630 | } |
631 | ||
54ceac45 | 632 | /* Get a superblock - note that we may end up sharing one that already exists */ |
f7b422b1 | 633 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); |
816724e6 TM |
634 | if (IS_ERR(s)) { |
635 | error = PTR_ERR(s); | |
54ceac45 | 636 | goto out_err_nosb; |
816724e6 TM |
637 | } |
638 | ||
54ceac45 DH |
639 | if (s->s_fs_info != server) { |
640 | nfs_free_server(server); | |
641 | server = NULL; | |
642 | } | |
f7b422b1 | 643 | |
54ceac45 DH |
644 | if (!s->s_root) { |
645 | /* initial superblock/root creation */ | |
646 | s->s_flags = flags; | |
647 | nfs_fill_super(s, data); | |
648 | } | |
f7b422b1 | 649 | |
54ceac45 DH |
650 | mntroot = nfs_get_root(s, &mntfh); |
651 | if (IS_ERR(mntroot)) { | |
652 | error = PTR_ERR(mntroot); | |
653 | goto error_splat_super; | |
f7b422b1 | 654 | } |
816724e6 | 655 | |
54ceac45 DH |
656 | s->s_flags |= MS_ACTIVE; |
657 | mnt->mnt_sb = s; | |
658 | mnt->mnt_root = mntroot; | |
659 | return 0; | |
816724e6 | 660 | |
54ceac45 DH |
661 | out_err_nosb: |
662 | nfs_free_server(server); | |
816724e6 TM |
663 | out_err_noserver: |
664 | return error; | |
54ceac45 DH |
665 | |
666 | error_splat_super: | |
667 | up_write(&s->s_umount); | |
668 | deactivate_super(s); | |
669 | return error; | |
f7b422b1 DH |
670 | } |
671 | ||
54ceac45 DH |
672 | /* |
673 | * Destroy an NFS2/3 superblock | |
674 | */ | |
f7b422b1 DH |
675 | static void nfs_kill_super(struct super_block *s) |
676 | { | |
677 | struct nfs_server *server = NFS_SB(s); | |
678 | ||
679 | kill_anon_super(s); | |
54ceac45 | 680 | nfs_free_server(server); |
f7b422b1 DH |
681 | } |
682 | ||
54ceac45 DH |
683 | /* |
684 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
685 | */ | |
686 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, | |
687 | const char *dev_name, void *raw_data, | |
688 | struct vfsmount *mnt) | |
f7b422b1 DH |
689 | { |
690 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
691 | struct super_block *s; |
692 | struct nfs_server *server; | |
693 | struct dentry *mntroot; | |
694 | int error; | |
f7b422b1 | 695 | |
54ceac45 | 696 | dprintk("--> nfs_xdev_get_sb()\n"); |
f7b422b1 | 697 | |
54ceac45 DH |
698 | /* create a new volume representation */ |
699 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
700 | if (IS_ERR(server)) { | |
701 | error = PTR_ERR(server); | |
702 | goto out_err_noserver; | |
703 | } | |
8fa5c000 | 704 | |
54ceac45 DH |
705 | /* Get a superblock - note that we may end up sharing one that already exists */ |
706 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
707 | if (IS_ERR(s)) { | |
708 | error = PTR_ERR(s); | |
709 | goto out_err_nosb; | |
710 | } | |
5006a76c | 711 | |
54ceac45 DH |
712 | if (s->s_fs_info != server) { |
713 | nfs_free_server(server); | |
714 | server = NULL; | |
f7b422b1 | 715 | } |
24c8dbbb | 716 | |
54ceac45 DH |
717 | if (!s->s_root) { |
718 | /* initial superblock/root creation */ | |
719 | s->s_flags = flags; | |
720 | nfs_clone_super(s, data->sb); | |
721 | } | |
f7b422b1 | 722 | |
54ceac45 DH |
723 | mntroot = nfs_get_root(s, data->fh); |
724 | if (IS_ERR(mntroot)) { | |
725 | error = PTR_ERR(mntroot); | |
726 | goto error_splat_super; | |
f7b422b1 DH |
727 | } |
728 | ||
54ceac45 DH |
729 | s->s_flags |= MS_ACTIVE; |
730 | mnt->mnt_sb = s; | |
731 | mnt->mnt_root = mntroot; | |
f7b422b1 | 732 | |
54ceac45 DH |
733 | dprintk("<-- nfs_xdev_get_sb() = 0\n"); |
734 | return 0; | |
24c8dbbb | 735 | |
54ceac45 DH |
736 | out_err_nosb: |
737 | nfs_free_server(server); | |
738 | out_err_noserver: | |
739 | dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); | |
740 | return error; | |
f7b422b1 | 741 | |
54ceac45 DH |
742 | error_splat_super: |
743 | up_write(&s->s_umount); | |
744 | deactivate_super(s); | |
745 | dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); | |
746 | return error; | |
f7b422b1 DH |
747 | } |
748 | ||
54ceac45 DH |
749 | #ifdef CONFIG_NFS_V4 |
750 | ||
f7b422b1 | 751 | /* |
54ceac45 | 752 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 753 | */ |
54ceac45 DH |
754 | static void nfs4_clone_super(struct super_block *sb, |
755 | const struct super_block *old_sb) | |
f7b422b1 | 756 | { |
54ceac45 DH |
757 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
758 | sb->s_blocksize = old_sb->s_blocksize; | |
759 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 760 | sb->s_time_gran = 1; |
54ceac45 DH |
761 | sb->s_op = old_sb->s_op; |
762 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
763 | } |
764 | ||
54ceac45 DH |
765 | /* |
766 | * Set up an NFS4 superblock | |
767 | */ | |
768 | static void nfs4_fill_super(struct super_block *sb) | |
f7b422b1 | 769 | { |
54ceac45 DH |
770 | sb->s_time_gran = 1; |
771 | sb->s_op = &nfs4_sops; | |
772 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
773 | } |
774 | ||
54ceac45 | 775 | static void *nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) |
f7b422b1 DH |
776 | { |
777 | void *p = NULL; | |
778 | ||
779 | if (!src->len) | |
780 | return ERR_PTR(-EINVAL); | |
781 | if (src->len < maxlen) | |
782 | maxlen = src->len; | |
783 | if (dst == NULL) { | |
784 | p = dst = kmalloc(maxlen + 1, GFP_KERNEL); | |
785 | if (p == NULL) | |
786 | return ERR_PTR(-ENOMEM); | |
787 | } | |
788 | if (copy_from_user(dst, src->data, maxlen)) { | |
789 | kfree(p); | |
790 | return ERR_PTR(-EFAULT); | |
791 | } | |
792 | dst[maxlen] = '\0'; | |
793 | return dst; | |
794 | } | |
795 | ||
54ceac45 DH |
796 | /* |
797 | * Get the superblock for an NFS4 mountpoint | |
798 | */ | |
816724e6 TM |
799 | static int nfs4_get_sb(struct file_system_type *fs_type, |
800 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 801 | { |
f7b422b1 | 802 | struct nfs4_mount_data *data = raw_data; |
54ceac45 DH |
803 | struct super_block *s; |
804 | struct nfs_server *server; | |
805 | struct sockaddr_in addr; | |
806 | rpc_authflavor_t authflavour; | |
807 | struct nfs_fh mntfh; | |
808 | struct dentry *mntroot; | |
809 | char *mntpath = NULL, *hostname = NULL, ip_addr[16]; | |
f7b422b1 | 810 | void *p; |
54ceac45 | 811 | int error; |
f7b422b1 DH |
812 | |
813 | if (data == NULL) { | |
814 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
816724e6 | 815 | return -EINVAL; |
f7b422b1 DH |
816 | } |
817 | if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { | |
818 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
816724e6 | 819 | return -EINVAL; |
f7b422b1 DH |
820 | } |
821 | ||
54ceac45 DH |
822 | /* We now require that the mount process passes the remote address */ |
823 | if (data->host_addrlen != sizeof(addr)) | |
824 | return -EINVAL; | |
825 | ||
826 | if (copy_from_user(&addr, data->host_addr, sizeof(addr))) | |
827 | return -EFAULT; | |
828 | ||
829 | if (addr.sin_family != AF_INET || | |
830 | addr.sin_addr.s_addr == INADDR_ANY | |
831 | ) { | |
832 | dprintk("%s: mount program didn't pass remote IP address!\n", | |
833 | __FUNCTION__); | |
834 | return -EINVAL; | |
835 | } | |
51b6ded4 TM |
836 | /* RFC3530: The default port for NFS is 2049 */ |
837 | if (addr.sin_port == 0) | |
575b5c78 | 838 | addr.sin_port = htons(NFS_PORT); |
54ceac45 DH |
839 | |
840 | /* Grab the authentication type */ | |
841 | authflavour = RPC_AUTH_UNIX; | |
842 | if (data->auth_flavourlen != 0) { | |
843 | if (data->auth_flavourlen != 1) { | |
844 | dprintk("%s: Invalid number of RPC auth flavours %d.\n", | |
845 | __FUNCTION__, data->auth_flavourlen); | |
846 | error = -EINVAL; | |
847 | goto out_err_noserver; | |
848 | } | |
849 | ||
850 | if (copy_from_user(&authflavour, data->auth_flavours, | |
851 | sizeof(authflavour))) { | |
852 | error = -EFAULT; | |
853 | goto out_err_noserver; | |
854 | } | |
855 | } | |
f7b422b1 DH |
856 | |
857 | p = nfs_copy_user_string(NULL, &data->hostname, 256); | |
858 | if (IS_ERR(p)) | |
859 | goto out_err; | |
54ceac45 | 860 | hostname = p; |
f7b422b1 DH |
861 | |
862 | p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); | |
863 | if (IS_ERR(p)) | |
864 | goto out_err; | |
54ceac45 | 865 | mntpath = p; |
f7b422b1 | 866 | |
54ceac45 DH |
867 | dprintk("MNTPATH: %s\n", mntpath); |
868 | ||
869 | p = nfs_copy_user_string(ip_addr, &data->client_addr, | |
870 | sizeof(ip_addr) - 1); | |
f7b422b1 DH |
871 | if (IS_ERR(p)) |
872 | goto out_err; | |
873 | ||
54ceac45 DH |
874 | /* Get a volume representation */ |
875 | server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr, | |
876 | authflavour, &mntfh); | |
877 | if (IS_ERR(server)) { | |
878 | error = PTR_ERR(server); | |
879 | goto out_err_noserver; | |
f7b422b1 DH |
880 | } |
881 | ||
54ceac45 DH |
882 | /* Get a superblock - note that we may end up sharing one that already exists */ |
883 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); | |
816724e6 TM |
884 | if (IS_ERR(s)) { |
885 | error = PTR_ERR(s); | |
f7b422b1 | 886 | goto out_free; |
816724e6 TM |
887 | } |
888 | ||
5dd3177a TM |
889 | if (s->s_fs_info != server) { |
890 | nfs_free_server(server); | |
891 | server = NULL; | |
892 | } | |
893 | ||
54ceac45 DH |
894 | if (!s->s_root) { |
895 | /* initial superblock/root creation */ | |
896 | s->s_flags = flags; | |
54ceac45 | 897 | nfs4_fill_super(s); |
54ceac45 | 898 | } |
f7b422b1 | 899 | |
54ceac45 DH |
900 | mntroot = nfs4_get_root(s, &mntfh); |
901 | if (IS_ERR(mntroot)) { | |
902 | error = PTR_ERR(mntroot); | |
903 | goto error_splat_super; | |
f7b422b1 | 904 | } |
54ceac45 | 905 | |
f7b422b1 | 906 | s->s_flags |= MS_ACTIVE; |
54ceac45 DH |
907 | mnt->mnt_sb = s; |
908 | mnt->mnt_root = mntroot; | |
909 | kfree(mntpath); | |
910 | kfree(hostname); | |
911 | return 0; | |
912 | ||
f7b422b1 | 913 | out_err: |
816724e6 | 914 | error = PTR_ERR(p); |
54ceac45 DH |
915 | goto out_err_noserver; |
916 | ||
f7b422b1 | 917 | out_free: |
54ceac45 DH |
918 | nfs_free_server(server); |
919 | out_err_noserver: | |
920 | kfree(mntpath); | |
921 | kfree(hostname); | |
816724e6 | 922 | return error; |
54ceac45 DH |
923 | |
924 | error_splat_super: | |
925 | up_write(&s->s_umount); | |
926 | deactivate_super(s); | |
927 | goto out_err_noserver; | |
f7b422b1 DH |
928 | } |
929 | ||
930 | static void nfs4_kill_super(struct super_block *sb) | |
931 | { | |
932 | struct nfs_server *server = NFS_SB(sb); | |
933 | ||
934 | nfs_return_all_delegations(sb); | |
935 | kill_anon_super(sb); | |
936 | ||
937 | nfs4_renewd_prepare_shutdown(server); | |
54ceac45 | 938 | nfs_free_server(server); |
f7b422b1 DH |
939 | } |
940 | ||
941 | /* | |
54ceac45 | 942 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 943 | */ |
54ceac45 DH |
944 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, |
945 | const char *dev_name, void *raw_data, | |
946 | struct vfsmount *mnt) | |
f7b422b1 | 947 | { |
54ceac45 DH |
948 | struct nfs_clone_mount *data = raw_data; |
949 | struct super_block *s; | |
950 | struct nfs_server *server; | |
951 | struct dentry *mntroot; | |
952 | int error; | |
f7b422b1 | 953 | |
54ceac45 | 954 | dprintk("--> nfs4_xdev_get_sb()\n"); |
f7b422b1 | 955 | |
54ceac45 DH |
956 | /* create a new volume representation */ |
957 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
958 | if (IS_ERR(server)) { | |
959 | error = PTR_ERR(server); | |
960 | goto out_err_noserver; | |
f7b422b1 | 961 | } |
f7b422b1 | 962 | |
54ceac45 DH |
963 | /* Get a superblock - note that we may end up sharing one that already exists */ |
964 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
965 | if (IS_ERR(s)) { | |
966 | error = PTR_ERR(s); | |
967 | goto out_err_nosb; | |
f7b422b1 | 968 | } |
f7b422b1 | 969 | |
54ceac45 DH |
970 | if (s->s_fs_info != server) { |
971 | nfs_free_server(server); | |
972 | server = NULL; | |
973 | } | |
f7b422b1 | 974 | |
54ceac45 DH |
975 | if (!s->s_root) { |
976 | /* initial superblock/root creation */ | |
977 | s->s_flags = flags; | |
978 | nfs4_clone_super(s, data->sb); | |
979 | } | |
f7b422b1 | 980 | |
54ceac45 DH |
981 | mntroot = nfs4_get_root(s, data->fh); |
982 | if (IS_ERR(mntroot)) { | |
983 | error = PTR_ERR(mntroot); | |
984 | goto error_splat_super; | |
985 | } | |
f7b422b1 | 986 | |
54ceac45 DH |
987 | s->s_flags |= MS_ACTIVE; |
988 | mnt->mnt_sb = s; | |
989 | mnt->mnt_root = mntroot; | |
990 | ||
991 | dprintk("<-- nfs4_xdev_get_sb() = 0\n"); | |
992 | return 0; | |
993 | ||
994 | out_err_nosb: | |
995 | nfs_free_server(server); | |
996 | out_err_noserver: | |
997 | dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); | |
998 | return error; | |
999 | ||
1000 | error_splat_super: | |
1001 | up_write(&s->s_umount); | |
1002 | deactivate_super(s); | |
1003 | dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); | |
1004 | return error; | |
f7b422b1 DH |
1005 | } |
1006 | ||
54ceac45 DH |
1007 | /* |
1008 | * Create an NFS4 server record on referral traversal | |
1009 | */ | |
1010 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, | |
1011 | const char *dev_name, void *raw_data, | |
1012 | struct vfsmount *mnt) | |
f7b422b1 DH |
1013 | { |
1014 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
1015 | struct super_block *s; |
1016 | struct nfs_server *server; | |
1017 | struct dentry *mntroot; | |
1018 | struct nfs_fh mntfh; | |
1019 | int error; | |
1020 | ||
1021 | dprintk("--> nfs4_referral_get_sb()\n"); | |
1022 | ||
1023 | /* create a new volume representation */ | |
1024 | server = nfs4_create_referral_server(data, &mntfh); | |
1025 | if (IS_ERR(server)) { | |
1026 | error = PTR_ERR(server); | |
1027 | goto out_err_noserver; | |
1028 | } | |
1029 | ||
1030 | /* Get a superblock - note that we may end up sharing one that already exists */ | |
1031 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
1032 | if (IS_ERR(s)) { | |
1033 | error = PTR_ERR(s); | |
1034 | goto out_err_nosb; | |
1035 | } | |
1036 | ||
1037 | if (s->s_fs_info != server) { | |
1038 | nfs_free_server(server); | |
1039 | server = NULL; | |
1040 | } | |
1041 | ||
1042 | if (!s->s_root) { | |
1043 | /* initial superblock/root creation */ | |
1044 | s->s_flags = flags; | |
1045 | nfs4_fill_super(s); | |
1046 | } | |
1047 | ||
f2d0d85e | 1048 | mntroot = nfs4_get_root(s, &mntfh); |
54ceac45 DH |
1049 | if (IS_ERR(mntroot)) { |
1050 | error = PTR_ERR(mntroot); | |
1051 | goto error_splat_super; | |
1052 | } | |
1053 | ||
1054 | s->s_flags |= MS_ACTIVE; | |
1055 | mnt->mnt_sb = s; | |
1056 | mnt->mnt_root = mntroot; | |
1057 | ||
1058 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); | |
1059 | return 0; | |
1060 | ||
1061 | out_err_nosb: | |
1062 | nfs_free_server(server); | |
1063 | out_err_noserver: | |
1064 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); | |
1065 | return error; | |
1066 | ||
1067 | error_splat_super: | |
1068 | up_write(&s->s_umount); | |
1069 | deactivate_super(s); | |
1070 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); | |
1071 | return error; | |
f7b422b1 DH |
1072 | } |
1073 | ||
54ceac45 | 1074 | #endif /* CONFIG_NFS_V4 */ |