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Commit | Line | Data |
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f7b422b1 DH |
1 | /* |
2 | * linux/fs/nfs/super.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs superblock handling functions | |
7 | * | |
8 | * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some | |
9 | * experimental NFS changes. Modularisation taken straight from SYS5 fs. | |
10 | * | |
11 | * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. | |
12 | * J.S.Peatfield@damtp.cam.ac.uk | |
13 | * | |
14 | * Split from inode.c by David Howells <dhowells@redhat.com> | |
15 | * | |
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 | ||
23 | #include <linux/config.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
26 | ||
27 | #include <linux/time.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/stat.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/unistd.h> | |
34 | #include <linux/sunrpc/clnt.h> | |
35 | #include <linux/sunrpc/stats.h> | |
36 | #include <linux/sunrpc/metrics.h> | |
37 | #include <linux/nfs_fs.h> | |
38 | #include <linux/nfs_mount.h> | |
39 | #include <linux/nfs4_mount.h> | |
40 | #include <linux/lockd/bind.h> | |
41 | #include <linux/smp_lock.h> | |
42 | #include <linux/seq_file.h> | |
43 | #include <linux/mount.h> | |
44 | #include <linux/nfs_idmap.h> | |
45 | #include <linux/vfs.h> | |
46 | #include <linux/inet.h> | |
47 | #include <linux/nfs_xdr.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 | ||
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, | |
74 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
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 DH |
81 | .kill_sb = nfs_kill_super, |
82 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
83 | }; | |
84 | ||
85 | static 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 | |
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, | |
110 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
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 DH |
117 | .kill_sb = nfs4_kill_super, |
118 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
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 DH |
125 | .kill_sb = nfs4_kill_super, |
126 | .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA, | |
127 | }; | |
128 | ||
129 | static 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 | ||
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 | ||
154 | #ifdef CONFIG_NFS_V4 | |
155 | ret = nfs_register_sysctl(); | |
156 | if (ret < 0) | |
157 | goto error_1; | |
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(); | |
168 | error_1: | |
169 | unregister_filesystem(&nfs_fs_type); | |
170 | #endif | |
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 | buf->f_type = NFS_SUPER_MAGIC; |
208 | if (error < 0) | |
209 | goto out_err; | |
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; | |
236 | out: | |
237 | unlock_kernel(); | |
238 | return 0; | |
239 | ||
240 | out_err: | |
241 | dprintk("%s: statfs error = %d\n", __FUNCTION__, -error); | |
242 | buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; | |
243 | goto out; | |
244 | ||
245 | } | |
246 | ||
7d4e2747 DH |
247 | /* |
248 | * Map the security flavour number to a name | |
249 | */ | |
81039f1f TM |
250 | static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
251 | { | |
7d4e2747 | 252 | static const struct { |
81039f1f TM |
253 | rpc_authflavor_t flavour; |
254 | const char *str; | |
255 | } sec_flavours[] = { | |
256 | { RPC_AUTH_NULL, "null" }, | |
257 | { RPC_AUTH_UNIX, "sys" }, | |
258 | { RPC_AUTH_GSS_KRB5, "krb5" }, | |
259 | { RPC_AUTH_GSS_KRB5I, "krb5i" }, | |
260 | { RPC_AUTH_GSS_KRB5P, "krb5p" }, | |
261 | { RPC_AUTH_GSS_LKEY, "lkey" }, | |
262 | { RPC_AUTH_GSS_LKEYI, "lkeyi" }, | |
263 | { RPC_AUTH_GSS_LKEYP, "lkeyp" }, | |
264 | { RPC_AUTH_GSS_SPKM, "spkm" }, | |
265 | { RPC_AUTH_GSS_SPKMI, "spkmi" }, | |
266 | { RPC_AUTH_GSS_SPKMP, "spkmp" }, | |
267 | { -1, "unknown" } | |
268 | }; | |
269 | int i; | |
270 | ||
271 | for (i=0; sec_flavours[i].flavour != -1; i++) { | |
272 | if (sec_flavours[i].flavour == flavour) | |
273 | break; | |
274 | } | |
275 | return sec_flavours[i].str; | |
276 | } | |
277 | ||
f7b422b1 DH |
278 | /* |
279 | * Describe the mount options in force on this server representation | |
280 | */ | |
281 | static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults) | |
282 | { | |
509de811 | 283 | static const struct proc_nfs_info { |
f7b422b1 | 284 | int flag; |
509de811 DH |
285 | const char *str; |
286 | const char *nostr; | |
f7b422b1 DH |
287 | } nfs_info[] = { |
288 | { NFS_MOUNT_SOFT, ",soft", ",hard" }, | |
289 | { NFS_MOUNT_INTR, ",intr", "" }, | |
290 | { NFS_MOUNT_NOCTO, ",nocto", "" }, | |
291 | { NFS_MOUNT_NOAC, ",noac", "" }, | |
292 | { NFS_MOUNT_NONLM, ",nolock", "" }, | |
293 | { NFS_MOUNT_NOACL, ",noacl", "" }, | |
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 | } | |
474 | /* Fill in pseudoflavor for mount version < 5 */ | |
475 | data->pseudoflavor = RPC_AUTH_UNIX; | |
476 | case 5: | |
477 | memset(data->context, 0, sizeof(data->context)); | |
f7b422b1 | 478 | } |
54ceac45 DH |
479 | |
480 | #ifndef CONFIG_NFS_V3 | |
481 | /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */ | |
482 | if (data->flags & NFS_MOUNT_VER3) { | |
483 | dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__); | |
484 | return -EPROTONOSUPPORT; | |
f7b422b1 | 485 | } |
54ceac45 | 486 | #endif /* CONFIG_NFS_V3 */ |
f7b422b1 | 487 | |
54ceac45 DH |
488 | /* We now require that the mount process passes the remote address */ |
489 | if (data->addr.sin_addr.s_addr == INADDR_ANY) { | |
490 | dprintk("%s: mount program didn't pass remote address!\n", | |
491 | __FUNCTION__); | |
492 | return -EINVAL; | |
f7b422b1 | 493 | } |
f7b422b1 | 494 | |
54ceac45 DH |
495 | /* Prepare the root filehandle */ |
496 | if (data->flags & NFS_MOUNT_VER3) | |
497 | mntfh->size = data->root.size; | |
498 | else | |
499 | mntfh->size = NFS2_FHSIZE; | |
f7b422b1 | 500 | |
54ceac45 DH |
501 | if (mntfh->size > sizeof(mntfh->data)) { |
502 | dprintk("%s: invalid root filehandle\n", __FUNCTION__); | |
503 | return -EINVAL; | |
504 | } | |
505 | ||
506 | memcpy(mntfh->data, data->root.data, mntfh->size); | |
507 | if (mntfh->size < sizeof(mntfh->data)) | |
508 | memset(mntfh->data + mntfh->size, 0, | |
509 | sizeof(mntfh->data) - mntfh->size); | |
f7b422b1 | 510 | |
f7b422b1 | 511 | return 0; |
f7b422b1 DH |
512 | } |
513 | ||
f7b422b1 | 514 | /* |
54ceac45 | 515 | * Initialise the common bits of the superblock |
f7b422b1 | 516 | */ |
54ceac45 | 517 | static inline void nfs_initialise_sb(struct super_block *sb) |
f7b422b1 | 518 | { |
54ceac45 | 519 | struct nfs_server *server = NFS_SB(sb); |
5006a76c | 520 | |
54ceac45 | 521 | sb->s_magic = NFS_SUPER_MAGIC; |
f7b422b1 | 522 | |
54ceac45 DH |
523 | /* We probably want something more informative here */ |
524 | snprintf(sb->s_id, sizeof(sb->s_id), | |
525 | "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev)); | |
5006a76c | 526 | |
54ceac45 DH |
527 | if (sb->s_blocksize == 0) |
528 | sb->s_blocksize = nfs_block_bits(server->wsize, | |
529 | &sb->s_blocksize_bits); | |
f7b422b1 | 530 | |
54ceac45 DH |
531 | if (server->flags & NFS_MOUNT_NOAC) |
532 | sb->s_flags |= MS_SYNCHRONOUS; | |
f7b422b1 | 533 | |
54ceac45 | 534 | nfs_super_set_maxbytes(sb, server->maxfilesize); |
f7b422b1 DH |
535 | } |
536 | ||
537 | /* | |
54ceac45 | 538 | * Finish setting up an NFS2/3 superblock |
f7b422b1 | 539 | */ |
54ceac45 | 540 | static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data) |
f7b422b1 DH |
541 | { |
542 | struct nfs_server *server = NFS_SB(sb); | |
5006a76c | 543 | |
54ceac45 DH |
544 | sb->s_blocksize_bits = 0; |
545 | sb->s_blocksize = 0; | |
546 | if (data->bsize) | |
547 | sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits); | |
f7b422b1 | 548 | |
54ceac45 DH |
549 | if (server->flags & NFS_MOUNT_VER3) { |
550 | /* The VFS shouldn't apply the umask to mode bits. We will do | |
551 | * so ourselves when necessary. | |
552 | */ | |
553 | sb->s_flags |= MS_POSIXACL; | |
554 | sb->s_time_gran = 1; | |
816724e6 | 555 | } |
54ceac45 DH |
556 | |
557 | sb->s_op = &nfs_sops; | |
558 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
559 | } |
560 | ||
561 | /* | |
54ceac45 | 562 | * Finish setting up a cloned NFS2/3 superblock |
f7b422b1 | 563 | */ |
54ceac45 DH |
564 | static void nfs_clone_super(struct super_block *sb, |
565 | const struct super_block *old_sb) | |
f7b422b1 | 566 | { |
54ceac45 DH |
567 | struct nfs_server *server = NFS_SB(sb); |
568 | ||
569 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; | |
570 | sb->s_blocksize = old_sb->s_blocksize; | |
571 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 572 | |
f7b422b1 | 573 | if (server->flags & NFS_MOUNT_VER3) { |
54ceac45 DH |
574 | /* The VFS shouldn't apply the umask to mode bits. We will do |
575 | * so ourselves when necessary. | |
f7b422b1 DH |
576 | */ |
577 | sb->s_flags |= MS_POSIXACL; | |
f7b422b1 | 578 | sb->s_time_gran = 1; |
f7b422b1 DH |
579 | } |
580 | ||
54ceac45 DH |
581 | sb->s_op = old_sb->s_op; |
582 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
583 | } |
584 | ||
54ceac45 | 585 | static int nfs_set_super(struct super_block *s, void *_server) |
f7b422b1 | 586 | { |
54ceac45 DH |
587 | struct nfs_server *server = _server; |
588 | int ret; | |
589 | ||
590 | s->s_fs_info = server; | |
591 | ret = set_anon_super(s, server); | |
592 | if (ret == 0) | |
593 | server->s_dev = s->s_dev; | |
594 | return ret; | |
f7b422b1 DH |
595 | } |
596 | ||
597 | static int nfs_compare_super(struct super_block *sb, void *data) | |
598 | { | |
54ceac45 | 599 | struct nfs_server *server = data, *old = NFS_SB(sb); |
f7b422b1 | 600 | |
54ceac45 | 601 | if (old->nfs_client != server->nfs_client) |
f7b422b1 | 602 | return 0; |
54ceac45 | 603 | if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) |
f7b422b1 | 604 | return 0; |
54ceac45 | 605 | return 1; |
f7b422b1 DH |
606 | } |
607 | ||
816724e6 TM |
608 | static int nfs_get_sb(struct file_system_type *fs_type, |
609 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 610 | { |
f7b422b1 DH |
611 | struct nfs_server *server = NULL; |
612 | struct super_block *s; | |
54ceac45 | 613 | struct nfs_fh mntfh; |
f7b422b1 | 614 | struct nfs_mount_data *data = raw_data; |
54ceac45 DH |
615 | struct dentry *mntroot; |
616 | int error; | |
f7b422b1 | 617 | |
54ceac45 DH |
618 | /* Validate the mount data */ |
619 | error = nfs_validate_mount_data(data, &mntfh); | |
620 | if (error < 0) | |
621 | return error; | |
f7b422b1 | 622 | |
54ceac45 DH |
623 | /* Get a volume representation */ |
624 | server = nfs_create_server(data, &mntfh); | |
625 | if (IS_ERR(server)) { | |
626 | error = PTR_ERR(server); | |
816724e6 | 627 | goto out_err_noserver; |
f7b422b1 DH |
628 | } |
629 | ||
54ceac45 | 630 | /* Get a superblock - note that we may end up sharing one that already exists */ |
f7b422b1 | 631 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); |
816724e6 TM |
632 | if (IS_ERR(s)) { |
633 | error = PTR_ERR(s); | |
54ceac45 | 634 | goto out_err_nosb; |
816724e6 TM |
635 | } |
636 | ||
54ceac45 DH |
637 | if (s->s_fs_info != server) { |
638 | nfs_free_server(server); | |
639 | server = NULL; | |
640 | } | |
f7b422b1 | 641 | |
54ceac45 DH |
642 | if (!s->s_root) { |
643 | /* initial superblock/root creation */ | |
644 | s->s_flags = flags; | |
645 | nfs_fill_super(s, data); | |
646 | } | |
f7b422b1 | 647 | |
54ceac45 DH |
648 | mntroot = nfs_get_root(s, &mntfh); |
649 | if (IS_ERR(mntroot)) { | |
650 | error = PTR_ERR(mntroot); | |
651 | goto error_splat_super; | |
f7b422b1 | 652 | } |
816724e6 | 653 | |
54ceac45 DH |
654 | s->s_flags |= MS_ACTIVE; |
655 | mnt->mnt_sb = s; | |
656 | mnt->mnt_root = mntroot; | |
657 | return 0; | |
816724e6 | 658 | |
54ceac45 DH |
659 | out_err_nosb: |
660 | nfs_free_server(server); | |
816724e6 TM |
661 | out_err_noserver: |
662 | return error; | |
54ceac45 DH |
663 | |
664 | error_splat_super: | |
665 | up_write(&s->s_umount); | |
666 | deactivate_super(s); | |
667 | return error; | |
f7b422b1 DH |
668 | } |
669 | ||
54ceac45 DH |
670 | /* |
671 | * Destroy an NFS2/3 superblock | |
672 | */ | |
f7b422b1 DH |
673 | static void nfs_kill_super(struct super_block *s) |
674 | { | |
675 | struct nfs_server *server = NFS_SB(s); | |
676 | ||
677 | kill_anon_super(s); | |
54ceac45 | 678 | nfs_free_server(server); |
f7b422b1 DH |
679 | } |
680 | ||
54ceac45 DH |
681 | /* |
682 | * Clone an NFS2/3 server record on xdev traversal (FSID-change) | |
683 | */ | |
684 | static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags, | |
685 | const char *dev_name, void *raw_data, | |
686 | struct vfsmount *mnt) | |
f7b422b1 DH |
687 | { |
688 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
689 | struct super_block *s; |
690 | struct nfs_server *server; | |
691 | struct dentry *mntroot; | |
692 | int error; | |
f7b422b1 | 693 | |
54ceac45 | 694 | dprintk("--> nfs_xdev_get_sb()\n"); |
f7b422b1 | 695 | |
54ceac45 DH |
696 | /* create a new volume representation */ |
697 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
698 | if (IS_ERR(server)) { | |
699 | error = PTR_ERR(server); | |
700 | goto out_err_noserver; | |
701 | } | |
8fa5c000 | 702 | |
54ceac45 DH |
703 | /* Get a superblock - note that we may end up sharing one that already exists */ |
704 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
705 | if (IS_ERR(s)) { | |
706 | error = PTR_ERR(s); | |
707 | goto out_err_nosb; | |
708 | } | |
5006a76c | 709 | |
54ceac45 DH |
710 | if (s->s_fs_info != server) { |
711 | nfs_free_server(server); | |
712 | server = NULL; | |
f7b422b1 | 713 | } |
24c8dbbb | 714 | |
54ceac45 DH |
715 | if (!s->s_root) { |
716 | /* initial superblock/root creation */ | |
717 | s->s_flags = flags; | |
718 | nfs_clone_super(s, data->sb); | |
719 | } | |
f7b422b1 | 720 | |
54ceac45 DH |
721 | mntroot = nfs_get_root(s, data->fh); |
722 | if (IS_ERR(mntroot)) { | |
723 | error = PTR_ERR(mntroot); | |
724 | goto error_splat_super; | |
f7b422b1 DH |
725 | } |
726 | ||
54ceac45 DH |
727 | s->s_flags |= MS_ACTIVE; |
728 | mnt->mnt_sb = s; | |
729 | mnt->mnt_root = mntroot; | |
f7b422b1 | 730 | |
54ceac45 DH |
731 | dprintk("<-- nfs_xdev_get_sb() = 0\n"); |
732 | return 0; | |
24c8dbbb | 733 | |
54ceac45 DH |
734 | out_err_nosb: |
735 | nfs_free_server(server); | |
736 | out_err_noserver: | |
737 | dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error); | |
738 | return error; | |
f7b422b1 | 739 | |
54ceac45 DH |
740 | error_splat_super: |
741 | up_write(&s->s_umount); | |
742 | deactivate_super(s); | |
743 | dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error); | |
744 | return error; | |
f7b422b1 DH |
745 | } |
746 | ||
54ceac45 DH |
747 | #ifdef CONFIG_NFS_V4 |
748 | ||
f7b422b1 | 749 | /* |
54ceac45 | 750 | * Finish setting up a cloned NFS4 superblock |
f7b422b1 | 751 | */ |
54ceac45 DH |
752 | static void nfs4_clone_super(struct super_block *sb, |
753 | const struct super_block *old_sb) | |
f7b422b1 | 754 | { |
54ceac45 DH |
755 | sb->s_blocksize_bits = old_sb->s_blocksize_bits; |
756 | sb->s_blocksize = old_sb->s_blocksize; | |
757 | sb->s_maxbytes = old_sb->s_maxbytes; | |
f7b422b1 | 758 | sb->s_time_gran = 1; |
54ceac45 DH |
759 | sb->s_op = old_sb->s_op; |
760 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
761 | } |
762 | ||
54ceac45 DH |
763 | /* |
764 | * Set up an NFS4 superblock | |
765 | */ | |
766 | static void nfs4_fill_super(struct super_block *sb) | |
f7b422b1 | 767 | { |
54ceac45 DH |
768 | sb->s_time_gran = 1; |
769 | sb->s_op = &nfs4_sops; | |
770 | nfs_initialise_sb(sb); | |
f7b422b1 DH |
771 | } |
772 | ||
54ceac45 | 773 | static void *nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen) |
f7b422b1 DH |
774 | { |
775 | void *p = NULL; | |
776 | ||
777 | if (!src->len) | |
778 | return ERR_PTR(-EINVAL); | |
779 | if (src->len < maxlen) | |
780 | maxlen = src->len; | |
781 | if (dst == NULL) { | |
782 | p = dst = kmalloc(maxlen + 1, GFP_KERNEL); | |
783 | if (p == NULL) | |
784 | return ERR_PTR(-ENOMEM); | |
785 | } | |
786 | if (copy_from_user(dst, src->data, maxlen)) { | |
787 | kfree(p); | |
788 | return ERR_PTR(-EFAULT); | |
789 | } | |
790 | dst[maxlen] = '\0'; | |
791 | return dst; | |
792 | } | |
793 | ||
54ceac45 DH |
794 | /* |
795 | * Get the superblock for an NFS4 mountpoint | |
796 | */ | |
816724e6 TM |
797 | static int nfs4_get_sb(struct file_system_type *fs_type, |
798 | int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) | |
f7b422b1 | 799 | { |
f7b422b1 | 800 | struct nfs4_mount_data *data = raw_data; |
54ceac45 DH |
801 | struct super_block *s; |
802 | struct nfs_server *server; | |
803 | struct sockaddr_in addr; | |
804 | rpc_authflavor_t authflavour; | |
805 | struct nfs_fh mntfh; | |
806 | struct dentry *mntroot; | |
807 | char *mntpath = NULL, *hostname = NULL, ip_addr[16]; | |
f7b422b1 | 808 | void *p; |
54ceac45 | 809 | int error; |
f7b422b1 DH |
810 | |
811 | if (data == NULL) { | |
812 | dprintk("%s: missing data argument\n", __FUNCTION__); | |
816724e6 | 813 | return -EINVAL; |
f7b422b1 DH |
814 | } |
815 | if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { | |
816 | dprintk("%s: bad mount version\n", __FUNCTION__); | |
816724e6 | 817 | return -EINVAL; |
f7b422b1 DH |
818 | } |
819 | ||
54ceac45 DH |
820 | /* We now require that the mount process passes the remote address */ |
821 | if (data->host_addrlen != sizeof(addr)) | |
822 | return -EINVAL; | |
823 | ||
824 | if (copy_from_user(&addr, data->host_addr, sizeof(addr))) | |
825 | return -EFAULT; | |
826 | ||
827 | if (addr.sin_family != AF_INET || | |
828 | addr.sin_addr.s_addr == INADDR_ANY | |
829 | ) { | |
830 | dprintk("%s: mount program didn't pass remote IP address!\n", | |
831 | __FUNCTION__); | |
832 | return -EINVAL; | |
833 | } | |
834 | ||
835 | /* Grab the authentication type */ | |
836 | authflavour = RPC_AUTH_UNIX; | |
837 | if (data->auth_flavourlen != 0) { | |
838 | if (data->auth_flavourlen != 1) { | |
839 | dprintk("%s: Invalid number of RPC auth flavours %d.\n", | |
840 | __FUNCTION__, data->auth_flavourlen); | |
841 | error = -EINVAL; | |
842 | goto out_err_noserver; | |
843 | } | |
844 | ||
845 | if (copy_from_user(&authflavour, data->auth_flavours, | |
846 | sizeof(authflavour))) { | |
847 | error = -EFAULT; | |
848 | goto out_err_noserver; | |
849 | } | |
850 | } | |
f7b422b1 DH |
851 | |
852 | p = nfs_copy_user_string(NULL, &data->hostname, 256); | |
853 | if (IS_ERR(p)) | |
854 | goto out_err; | |
54ceac45 | 855 | hostname = p; |
f7b422b1 DH |
856 | |
857 | p = nfs_copy_user_string(NULL, &data->mnt_path, 1024); | |
858 | if (IS_ERR(p)) | |
859 | goto out_err; | |
54ceac45 | 860 | mntpath = p; |
f7b422b1 | 861 | |
54ceac45 DH |
862 | dprintk("MNTPATH: %s\n", mntpath); |
863 | ||
864 | p = nfs_copy_user_string(ip_addr, &data->client_addr, | |
865 | sizeof(ip_addr) - 1); | |
f7b422b1 DH |
866 | if (IS_ERR(p)) |
867 | goto out_err; | |
868 | ||
54ceac45 DH |
869 | /* Get a volume representation */ |
870 | server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr, | |
871 | authflavour, &mntfh); | |
872 | if (IS_ERR(server)) { | |
873 | error = PTR_ERR(server); | |
874 | goto out_err_noserver; | |
f7b422b1 DH |
875 | } |
876 | ||
54ceac45 DH |
877 | /* Get a superblock - note that we may end up sharing one that already exists */ |
878 | s = sget(fs_type, nfs_compare_super, nfs_set_super, server); | |
816724e6 TM |
879 | if (IS_ERR(s)) { |
880 | error = PTR_ERR(s); | |
f7b422b1 | 881 | goto out_free; |
816724e6 TM |
882 | } |
883 | ||
54ceac45 DH |
884 | if (!s->s_root) { |
885 | /* initial superblock/root creation */ | |
886 | s->s_flags = flags; | |
f7b422b1 | 887 | |
54ceac45 DH |
888 | nfs4_fill_super(s); |
889 | } else { | |
890 | nfs_free_server(server); | |
891 | } | |
f7b422b1 | 892 | |
54ceac45 DH |
893 | mntroot = nfs4_get_root(s, &mntfh); |
894 | if (IS_ERR(mntroot)) { | |
895 | error = PTR_ERR(mntroot); | |
896 | goto error_splat_super; | |
f7b422b1 | 897 | } |
54ceac45 | 898 | |
f7b422b1 | 899 | s->s_flags |= MS_ACTIVE; |
54ceac45 DH |
900 | mnt->mnt_sb = s; |
901 | mnt->mnt_root = mntroot; | |
902 | kfree(mntpath); | |
903 | kfree(hostname); | |
904 | return 0; | |
905 | ||
f7b422b1 | 906 | out_err: |
816724e6 | 907 | error = PTR_ERR(p); |
54ceac45 DH |
908 | goto out_err_noserver; |
909 | ||
f7b422b1 | 910 | out_free: |
54ceac45 DH |
911 | nfs_free_server(server); |
912 | out_err_noserver: | |
913 | kfree(mntpath); | |
914 | kfree(hostname); | |
816724e6 | 915 | return error; |
54ceac45 DH |
916 | |
917 | error_splat_super: | |
918 | up_write(&s->s_umount); | |
919 | deactivate_super(s); | |
920 | goto out_err_noserver; | |
f7b422b1 DH |
921 | } |
922 | ||
923 | static void nfs4_kill_super(struct super_block *sb) | |
924 | { | |
925 | struct nfs_server *server = NFS_SB(sb); | |
926 | ||
927 | nfs_return_all_delegations(sb); | |
928 | kill_anon_super(sb); | |
929 | ||
930 | nfs4_renewd_prepare_shutdown(server); | |
54ceac45 | 931 | nfs_free_server(server); |
f7b422b1 DH |
932 | } |
933 | ||
934 | /* | |
54ceac45 | 935 | * Clone an NFS4 server record on xdev traversal (FSID-change) |
f7b422b1 | 936 | */ |
54ceac45 DH |
937 | static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags, |
938 | const char *dev_name, void *raw_data, | |
939 | struct vfsmount *mnt) | |
f7b422b1 | 940 | { |
54ceac45 DH |
941 | struct nfs_clone_mount *data = raw_data; |
942 | struct super_block *s; | |
943 | struct nfs_server *server; | |
944 | struct dentry *mntroot; | |
945 | int error; | |
f7b422b1 | 946 | |
54ceac45 | 947 | dprintk("--> nfs4_xdev_get_sb()\n"); |
f7b422b1 | 948 | |
54ceac45 DH |
949 | /* create a new volume representation */ |
950 | server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr); | |
951 | if (IS_ERR(server)) { | |
952 | error = PTR_ERR(server); | |
953 | goto out_err_noserver; | |
f7b422b1 | 954 | } |
f7b422b1 | 955 | |
54ceac45 DH |
956 | /* Get a superblock - note that we may end up sharing one that already exists */ |
957 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
958 | if (IS_ERR(s)) { | |
959 | error = PTR_ERR(s); | |
960 | goto out_err_nosb; | |
f7b422b1 | 961 | } |
f7b422b1 | 962 | |
54ceac45 DH |
963 | if (s->s_fs_info != server) { |
964 | nfs_free_server(server); | |
965 | server = NULL; | |
966 | } | |
f7b422b1 | 967 | |
54ceac45 DH |
968 | if (!s->s_root) { |
969 | /* initial superblock/root creation */ | |
970 | s->s_flags = flags; | |
971 | nfs4_clone_super(s, data->sb); | |
972 | } | |
f7b422b1 | 973 | |
54ceac45 DH |
974 | mntroot = nfs4_get_root(s, data->fh); |
975 | if (IS_ERR(mntroot)) { | |
976 | error = PTR_ERR(mntroot); | |
977 | goto error_splat_super; | |
978 | } | |
f7b422b1 | 979 | |
54ceac45 DH |
980 | s->s_flags |= MS_ACTIVE; |
981 | mnt->mnt_sb = s; | |
982 | mnt->mnt_root = mntroot; | |
983 | ||
984 | dprintk("<-- nfs4_xdev_get_sb() = 0\n"); | |
985 | return 0; | |
986 | ||
987 | out_err_nosb: | |
988 | nfs_free_server(server); | |
989 | out_err_noserver: | |
990 | dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error); | |
991 | return error; | |
992 | ||
993 | error_splat_super: | |
994 | up_write(&s->s_umount); | |
995 | deactivate_super(s); | |
996 | dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error); | |
997 | return error; | |
f7b422b1 DH |
998 | } |
999 | ||
54ceac45 DH |
1000 | /* |
1001 | * Create an NFS4 server record on referral traversal | |
1002 | */ | |
1003 | static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags, | |
1004 | const char *dev_name, void *raw_data, | |
1005 | struct vfsmount *mnt) | |
f7b422b1 DH |
1006 | { |
1007 | struct nfs_clone_mount *data = raw_data; | |
54ceac45 DH |
1008 | struct super_block *s; |
1009 | struct nfs_server *server; | |
1010 | struct dentry *mntroot; | |
1011 | struct nfs_fh mntfh; | |
1012 | int error; | |
1013 | ||
1014 | dprintk("--> nfs4_referral_get_sb()\n"); | |
1015 | ||
1016 | /* create a new volume representation */ | |
1017 | server = nfs4_create_referral_server(data, &mntfh); | |
1018 | if (IS_ERR(server)) { | |
1019 | error = PTR_ERR(server); | |
1020 | goto out_err_noserver; | |
1021 | } | |
1022 | ||
1023 | /* Get a superblock - note that we may end up sharing one that already exists */ | |
1024 | s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server); | |
1025 | if (IS_ERR(s)) { | |
1026 | error = PTR_ERR(s); | |
1027 | goto out_err_nosb; | |
1028 | } | |
1029 | ||
1030 | if (s->s_fs_info != server) { | |
1031 | nfs_free_server(server); | |
1032 | server = NULL; | |
1033 | } | |
1034 | ||
1035 | if (!s->s_root) { | |
1036 | /* initial superblock/root creation */ | |
1037 | s->s_flags = flags; | |
1038 | nfs4_fill_super(s); | |
1039 | } | |
1040 | ||
1041 | mntroot = nfs4_get_root(s, data->fh); | |
1042 | if (IS_ERR(mntroot)) { | |
1043 | error = PTR_ERR(mntroot); | |
1044 | goto error_splat_super; | |
1045 | } | |
1046 | ||
1047 | s->s_flags |= MS_ACTIVE; | |
1048 | mnt->mnt_sb = s; | |
1049 | mnt->mnt_root = mntroot; | |
1050 | ||
1051 | dprintk("<-- nfs4_referral_get_sb() = 0\n"); | |
1052 | return 0; | |
1053 | ||
1054 | out_err_nosb: | |
1055 | nfs_free_server(server); | |
1056 | out_err_noserver: | |
1057 | dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error); | |
1058 | return error; | |
1059 | ||
1060 | error_splat_super: | |
1061 | up_write(&s->s_umount); | |
1062 | deactivate_super(s); | |
1063 | dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error); | |
1064 | return error; | |
f7b422b1 DH |
1065 | } |
1066 | ||
54ceac45 | 1067 | #endif /* CONFIG_NFS_V4 */ |