blob: aab5cd61725d27f7b2cf287c30956722ea9a3aa6 [file] [log] [blame]
David Howellsf7b422b2006-06-09 09:34:33 -04001/*
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 *
David Howells54ceac42006-08-22 20:06:13 -040016 * - 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())
David Howellsf7b422b2006-06-09 09:34:33 -040021 */
22
David Howellsf7b422b2006-06-09 09:34:33 -040023#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>
Adrian Bunkb5d5dfb2007-02-12 00:53:40 -080047#include <linux/magic.h>
David Howellsf7b422b2006-06-09 09:34:33 -040048
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
David Howellsf7b422b2006-06-09 09:34:33 -040060static void nfs_umount_begin(struct vfsmount *, int);
Trond Myklebust816724e2006-06-24 08:41:41 -040061static int nfs_statfs(struct dentry *, struct kstatfs *);
David Howellsf7b422b2006-06-09 09:34:33 -040062static int nfs_show_options(struct seq_file *, struct vfsmount *);
63static int nfs_show_stats(struct seq_file *, struct vfsmount *);
Trond Myklebust816724e2006-06-24 08:41:41 -040064static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
David Howells54ceac42006-08-22 20:06:13 -040065static int nfs_xdev_get_sb(struct file_system_type *fs_type,
Trond Myklebust816724e2006-06-24 08:41:41 -040066 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howellsf7b422b2006-06-09 09:34:33 -040067static void nfs_kill_super(struct super_block *);
68
69static 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,
Mark Fasheh349457c2006-09-08 14:22:21 -070074 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -040075};
76
David Howells54ceac42006-08-22 20:06:13 -040077struct file_system_type nfs_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -040078 .owner = THIS_MODULE,
79 .name = "nfs",
David Howells54ceac42006-08-22 20:06:13 -040080 .get_sb = nfs_xdev_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -040081 .kill_sb = nfs_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -070082 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -040083};
84
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080085static const struct super_operations nfs_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -040086 .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
Trond Myklebust816724e2006-06-24 08:41:41 -040097static int nfs4_get_sb(struct file_system_type *fs_type,
98 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howells54ceac42006-08-22 20:06:13 -040099static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
100 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
101static int nfs4_referral_get_sb(struct file_system_type *fs_type,
102 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
David Howellsf7b422b2006-06-09 09:34:33 -0400103static void nfs4_kill_super(struct super_block *sb);
104
105static 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,
Mark Fasheh349457c2006-09-08 14:22:21 -0700110 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400111};
112
David Howells54ceac42006-08-22 20:06:13 -0400113struct file_system_type nfs4_xdev_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400114 .owner = THIS_MODULE,
115 .name = "nfs4",
David Howells54ceac42006-08-22 20:06:13 -0400116 .get_sb = nfs4_xdev_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -0400117 .kill_sb = nfs4_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700118 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400119};
120
David Howells54ceac42006-08-22 20:06:13 -0400121struct file_system_type nfs4_referral_fs_type = {
David Howellsf7b422b2006-06-09 09:34:33 -0400122 .owner = THIS_MODULE,
123 .name = "nfs4",
David Howells54ceac42006-08-22 20:06:13 -0400124 .get_sb = nfs4_referral_get_sb,
David Howellsf7b422b2006-06-09 09:34:33 -0400125 .kill_sb = nfs4_kill_super,
Mark Fasheh349457c2006-09-08 14:22:21 -0700126 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
David Howellsf7b422b2006-06-09 09:34:33 -0400127};
128
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800129static const struct super_operations nfs4_sops = {
David Howellsf7b422b2006-06-09 09:34:33 -0400130 .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
Trond Myklebust979df722006-07-25 11:28:19 -0400141static struct shrinker *acl_shrinker;
142
David Howellsf7b422b2006-06-09 09:34:33 -0400143/*
144 * Register the NFS filesystems
145 */
146int __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
David Howellsf7b422b2006-06-09 09:34:33 -0400154 ret = nfs_register_sysctl();
155 if (ret < 0)
156 goto error_1;
Peter Zijlstra89a09142007-03-16 13:38:26 -0800157#ifdef CONFIG_NFS_V4
David Howellsf7b422b2006-06-09 09:34:33 -0400158 ret = register_filesystem(&nfs4_fs_type);
159 if (ret < 0)
160 goto error_2;
161#endif
Trond Myklebust979df722006-07-25 11:28:19 -0400162 acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400163 return 0;
164
165#ifdef CONFIG_NFS_V4
166error_2:
167 nfs_unregister_sysctl();
Peter Zijlstra89a09142007-03-16 13:38:26 -0800168#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400169error_1:
170 unregister_filesystem(&nfs_fs_type);
David Howellsf7b422b2006-06-09 09:34:33 -0400171error_0:
172 return ret;
173}
174
175/*
176 * Unregister the NFS filesystems
177 */
178void __exit unregister_nfs_fs(void)
179{
Trond Myklebust979df722006-07-25 11:28:19 -0400180 if (acl_shrinker != NULL)
181 remove_shrinker(acl_shrinker);
David Howellsf7b422b2006-06-09 09:34:33 -0400182#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 */
Trond Myklebust816724e2006-06-24 08:41:41 -0400192static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
David Howellsf7b422b2006-06-09 09:34:33 -0400193{
David Howells0c7d90c2006-08-22 20:06:10 -0400194 struct nfs_server *server = NFS_SB(dentry->d_sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400195 unsigned char blockbits;
196 unsigned long blockres;
David Howells0c7d90c2006-08-22 20:06:10 -0400197 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
David Howellsf7b422b2006-06-09 09:34:33 -0400198 struct nfs_fattr fattr;
199 struct nfs_fsstat res = {
200 .fattr = &fattr,
201 };
202 int error;
203
204 lock_kernel();
205
David Howells8fa5c002006-08-22 20:06:12 -0400206 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
David Howellsf7b422b2006-06-09 09:34:33 -0400207 if (error < 0)
208 goto out_err;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700209 buf->f_type = NFS_SUPER_MAGIC;
David Howellsf7b422b2006-06-09 09:34:33 -0400210
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 */
David Howells0c7d90c2006-08-22 20:06:10 -0400216 buf->f_frsize = dentry->d_sb->s_blocksize;
David Howellsf7b422b2006-06-09 09:34:33 -0400217
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 */
David Howells0c7d90c2006-08-22 20:06:10 -0400225 buf->f_bsize = dentry->d_sb->s_blocksize;
226 blockbits = dentry->d_sb->s_blocksize_bits;
David Howellsf7b422b2006-06-09 09:34:33 -0400227 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;
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700236
David Howellsf7b422b2006-06-09 09:34:33 -0400237 unlock_kernel();
238 return 0;
239
240 out_err:
241 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
Amnon Aaronsohn1a0ba9a2007-04-09 22:05:26 -0700242 unlock_kernel();
243 return error;
David Howellsf7b422b2006-06-09 09:34:33 -0400244}
245
David Howells7d4e2742006-08-22 20:06:07 -0400246/*
247 * Map the security flavour number to a name
248 */
Trond Myklebust81039f12006-06-09 09:34:34 -0400249static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
250{
David Howells7d4e2742006-08-22 20:06:07 -0400251 static const struct {
Trond Myklebust81039f12006-06-09 09:34:34 -0400252 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
David Howellsf7b422b2006-06-09 09:34:33 -0400277/*
278 * Describe the mount options in force on this server representation
279 */
280static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
281{
David Howells509de812006-08-22 20:06:11 -0400282 static const struct proc_nfs_info {
David Howellsf7b422b2006-06-09 09:34:33 -0400283 int flag;
David Howells509de812006-08-22 20:06:11 -0400284 const char *str;
285 const char *nostr;
David Howellsf7b422b2006-06-09 09:34:33 -0400286 } 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", "" },
Steve Dickson74dd34e2007-04-14 17:01:15 -0400293 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
David Howellsf7b422b2006-06-09 09:34:33 -0400294 { 0, NULL, NULL }
295 };
David Howells509de812006-08-22 20:06:11 -0400296 const struct proc_nfs_info *nfs_infop;
David Howells8fa5c002006-08-22 20:06:12 -0400297 struct nfs_client *clp = nfss->nfs_client;
David Howellsf7b422b2006-06-09 09:34:33 -0400298 char buf[12];
David Howells509de812006-08-22 20:06:11 -0400299 const char *proto;
David Howellsf7b422b2006-06-09 09:34:33 -0400300
David Howells8fa5c002006-08-22 20:06:12 -0400301 seq_printf(m, ",vers=%d", clp->rpc_ops->version);
David Howellsf7b422b2006-06-09 09:34:33 -0400302 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);
David Howells5006a762006-08-22 20:06:12 -0400330 seq_printf(m, ",timeo=%lu", 10U * clp->retrans_timeo / HZ);
331 seq_printf(m, ",retrans=%u", clp->retrans_count);
Trond Myklebust81039f12006-06-09 09:34:34 -0400332 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
David Howellsf7b422b2006-06-09 09:34:33 -0400333}
334
335/*
336 * Describe the mount options on this VFS mountpoint
337 */
338static 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=");
David Howells54ceac42006-08-22 20:06:13 -0400345 seq_escape(m, nfss->nfs_client->cl_hostname, " \t\n\\");
David Howellsf7b422b2006-06-09 09:34:33 -0400346
347 return 0;
348}
349
350/*
351 * Present statistical information for this VFS mountpoint
352 */
353static 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
David Howells8fa5c002006-08-22 20:06:12 -0400382 if (nfss->nfs_client->cl_nfsversion == 4) {
David Howellsf7b422b2006-06-09 09:34:33 -0400383 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
David Howells54ceac42006-08-22 20:06:13 -0400429 * in response to xdev traversals and referrals
David Howellsf7b422b2006-06-09 09:34:33 -0400430 */
431static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
432{
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400433 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
434 struct rpc_clnt *rpc;
435
David Howellsf7b422b2006-06-09 09:34:33 -0400436 shrink_submounts(vfsmnt, &nfs_automount_list);
Trond Myklebustfc6ae3c2007-06-05 19:13:47 -0400437
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);
David Howellsf7b422b2006-06-09 09:34:33 -0400447}
448
449/*
David Howells54ceac42006-08-22 20:06:13 -0400450 * Validate the NFS2/NFS3 mount data
451 * - fills in the mount root filehandle
David Howellsf7b422b2006-06-09 09:34:33 -0400452 */
David Howells54ceac42006-08-22 20:06:13 -0400453static int nfs_validate_mount_data(struct nfs_mount_data *data,
454 struct nfs_fh *mntfh)
David Howellsf7b422b2006-06-09 09:34:33 -0400455{
David Howellsf7b422b2006-06-09 09:34:33 -0400456 if (data == NULL) {
457 dprintk("%s: missing data argument\n", __FUNCTION__);
David Howells54ceac42006-08-22 20:06:13 -0400458 return -EINVAL;
David Howellsf7b422b2006-06-09 09:34:33 -0400459 }
David Howells54ceac42006-08-22 20:06:13 -0400460
David Howellsf7b422b2006-06-09 09:34:33 -0400461 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
462 dprintk("%s: bad mount version\n", __FUNCTION__);
David Howells54ceac42006-08-22 20:06:13 -0400463 return -EINVAL;
David Howellsf7b422b2006-06-09 09:34:33 -0400464 }
David Howells54ceac42006-08-22 20:06:13 -0400465
David Howellsf7b422b2006-06-09 09:34:33 -0400466 switch (data->version) {
467 case 1:
468 data->namlen = 0;
469 case 2:
470 data->bsize = 0;
471 case 3:
472 if (data->flags & NFS_MOUNT_VER3) {
473 dprintk("%s: mount structure version %d does not support NFSv3\n",
474 __FUNCTION__,
475 data->version);
David Howells54ceac42006-08-22 20:06:13 -0400476 return -EINVAL;
David Howellsf7b422b2006-06-09 09:34:33 -0400477 }
478 data->root.size = NFS2_FHSIZE;
479 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
480 case 4:
481 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
482 dprintk("%s: mount structure version %d does not support strong security\n",
483 __FUNCTION__,
484 data->version);
David Howells54ceac42006-08-22 20:06:13 -0400485 return -EINVAL;
David Howellsf7b422b2006-06-09 09:34:33 -0400486 }
487 case 5:
488 memset(data->context, 0, sizeof(data->context));
489 }
David Howells54ceac42006-08-22 20:06:13 -0400490
Trond Myklebust36b15c52006-08-22 20:06:14 -0400491 /* Set the pseudoflavor */
492 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
493 data->pseudoflavor = RPC_AUTH_UNIX;
494
David Howellsf7b422b2006-06-09 09:34:33 -0400495#ifndef CONFIG_NFS_V3
496 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
David Howellsf7b422b2006-06-09 09:34:33 -0400497 if (data->flags & NFS_MOUNT_VER3) {
498 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
David Howells54ceac42006-08-22 20:06:13 -0400499 return -EPROTONOSUPPORT;
David Howellsf7b422b2006-06-09 09:34:33 -0400500 }
501#endif /* CONFIG_NFS_V3 */
502
David Howellsf7b422b2006-06-09 09:34:33 -0400503 /* We now require that the mount process passes the remote address */
David Howells54ceac42006-08-22 20:06:13 -0400504 if (data->addr.sin_addr.s_addr == INADDR_ANY) {
David Howellsf7b422b2006-06-09 09:34:33 -0400505 dprintk("%s: mount program didn't pass remote address!\n",
David Howells54ceac42006-08-22 20:06:13 -0400506 __FUNCTION__);
507 return -EINVAL;
David Howellsf7b422b2006-06-09 09:34:33 -0400508 }
509
David Howells54ceac42006-08-22 20:06:13 -0400510 /* Prepare the root filehandle */
511 if (data->flags & NFS_MOUNT_VER3)
512 mntfh->size = data->root.size;
513 else
514 mntfh->size = NFS2_FHSIZE;
515
516 if (mntfh->size > sizeof(mntfh->data)) {
517 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
518 return -EINVAL;
519 }
520
521 memcpy(mntfh->data, data->root.data, mntfh->size);
522 if (mntfh->size < sizeof(mntfh->data))
523 memset(mntfh->data + mntfh->size, 0,
524 sizeof(mntfh->data) - mntfh->size);
525
526 return 0;
527}
528
529/*
530 * Initialise the common bits of the superblock
531 */
532static inline void nfs_initialise_sb(struct super_block *sb)
533{
534 struct nfs_server *server = NFS_SB(sb);
535
536 sb->s_magic = NFS_SUPER_MAGIC;
537
538 /* We probably want something more informative here */
539 snprintf(sb->s_id, sizeof(sb->s_id),
540 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
541
542 if (sb->s_blocksize == 0)
543 sb->s_blocksize = nfs_block_bits(server->wsize,
544 &sb->s_blocksize_bits);
545
546 if (server->flags & NFS_MOUNT_NOAC)
547 sb->s_flags |= MS_SYNCHRONOUS;
548
549 nfs_super_set_maxbytes(sb, server->maxfilesize);
550}
551
552/*
553 * Finish setting up an NFS2/3 superblock
554 */
555static void nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data)
556{
557 struct nfs_server *server = NFS_SB(sb);
558
559 sb->s_blocksize_bits = 0;
560 sb->s_blocksize = 0;
561 if (data->bsize)
562 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
563
564 if (server->flags & NFS_MOUNT_VER3) {
565 /* The VFS shouldn't apply the umask to mode bits. We will do
566 * so ourselves when necessary.
567 */
568 sb->s_flags |= MS_POSIXACL;
569 sb->s_time_gran = 1;
570 }
571
572 sb->s_op = &nfs_sops;
573 nfs_initialise_sb(sb);
574}
575
576/*
577 * Finish setting up a cloned NFS2/3 superblock
578 */
579static void nfs_clone_super(struct super_block *sb,
580 const struct super_block *old_sb)
581{
582 struct nfs_server *server = NFS_SB(sb);
583
584 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
585 sb->s_blocksize = old_sb->s_blocksize;
586 sb->s_maxbytes = old_sb->s_maxbytes;
587
588 if (server->flags & NFS_MOUNT_VER3) {
589 /* The VFS shouldn't apply the umask to mode bits. We will do
590 * so ourselves when necessary.
591 */
592 sb->s_flags |= MS_POSIXACL;
593 sb->s_time_gran = 1;
594 }
595
596 sb->s_op = old_sb->s_op;
597 nfs_initialise_sb(sb);
598}
599
600static int nfs_set_super(struct super_block *s, void *_server)
601{
602 struct nfs_server *server = _server;
603 int ret;
604
605 s->s_fs_info = server;
606 ret = set_anon_super(s, server);
607 if (ret == 0)
608 server->s_dev = s->s_dev;
609 return ret;
610}
611
612static int nfs_compare_super(struct super_block *sb, void *data)
613{
614 struct nfs_server *server = data, *old = NFS_SB(sb);
615
616 if (old->nfs_client != server->nfs_client)
617 return 0;
618 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
619 return 0;
620 return 1;
621}
622
623static int nfs_get_sb(struct file_system_type *fs_type,
624 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
625{
626 struct nfs_server *server = NULL;
627 struct super_block *s;
628 struct nfs_fh mntfh;
629 struct nfs_mount_data *data = raw_data;
630 struct dentry *mntroot;
631 int error;
632
633 /* Validate the mount data */
634 error = nfs_validate_mount_data(data, &mntfh);
635 if (error < 0)
Chuck Lever06559602007-07-01 12:12:35 -0400636 goto out;
David Howells54ceac42006-08-22 20:06:13 -0400637
638 /* Get a volume representation */
639 server = nfs_create_server(data, &mntfh);
640 if (IS_ERR(server)) {
641 error = PTR_ERR(server);
Chuck Lever06559602007-07-01 12:12:35 -0400642 goto out;
David Howells54ceac42006-08-22 20:06:13 -0400643 }
644
645 /* Get a superblock - note that we may end up sharing one that already exists */
David Howellsf7b422b2006-06-09 09:34:33 -0400646 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
Trond Myklebust816724e2006-06-24 08:41:41 -0400647 if (IS_ERR(s)) {
648 error = PTR_ERR(s);
David Howells54ceac42006-08-22 20:06:13 -0400649 goto out_err_nosb;
Trond Myklebust816724e2006-06-24 08:41:41 -0400650 }
651
David Howells54ceac42006-08-22 20:06:13 -0400652 if (s->s_fs_info != server) {
653 nfs_free_server(server);
654 server = NULL;
David Howellsf7b422b2006-06-09 09:34:33 -0400655 }
David Howells54ceac42006-08-22 20:06:13 -0400656
657 if (!s->s_root) {
658 /* initial superblock/root creation */
659 s->s_flags = flags;
660 nfs_fill_super(s, data);
661 }
662
663 mntroot = nfs_get_root(s, &mntfh);
664 if (IS_ERR(mntroot)) {
665 error = PTR_ERR(mntroot);
666 goto error_splat_super;
667 }
668
David Howellsf7b422b2006-06-09 09:34:33 -0400669 s->s_flags |= MS_ACTIVE;
David Howells54ceac42006-08-22 20:06:13 -0400670 mnt->mnt_sb = s;
671 mnt->mnt_root = mntroot;
Chuck Lever06559602007-07-01 12:12:35 -0400672 error = 0;
673
674out:
675 return error;
Trond Myklebust816724e2006-06-24 08:41:41 -0400676
David Howells54ceac42006-08-22 20:06:13 -0400677out_err_nosb:
678 nfs_free_server(server);
Chuck Lever06559602007-07-01 12:12:35 -0400679 goto out;
David Howells54ceac42006-08-22 20:06:13 -0400680
681error_splat_super:
682 up_write(&s->s_umount);
683 deactivate_super(s);
Chuck Lever06559602007-07-01 12:12:35 -0400684 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -0400685}
686
David Howells54ceac42006-08-22 20:06:13 -0400687/*
688 * Destroy an NFS2/3 superblock
689 */
David Howellsf7b422b2006-06-09 09:34:33 -0400690static void nfs_kill_super(struct super_block *s)
691{
692 struct nfs_server *server = NFS_SB(s);
693
694 kill_anon_super(s);
David Howells54ceac42006-08-22 20:06:13 -0400695 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -0400696}
697
David Howells54ceac42006-08-22 20:06:13 -0400698/*
699 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
700 */
701static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
702 const char *dev_name, void *raw_data,
703 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -0400704{
705 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -0400706 struct super_block *s;
707 struct nfs_server *server;
708 struct dentry *mntroot;
709 int error;
710
711 dprintk("--> nfs_xdev_get_sb()\n");
712
713 /* create a new volume representation */
714 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
715 if (IS_ERR(server)) {
716 error = PTR_ERR(server);
717 goto out_err_noserver;
718 }
719
720 /* Get a superblock - note that we may end up sharing one that already exists */
721 s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
722 if (IS_ERR(s)) {
723 error = PTR_ERR(s);
724 goto out_err_nosb;
725 }
726
727 if (s->s_fs_info != server) {
728 nfs_free_server(server);
729 server = NULL;
730 }
731
732 if (!s->s_root) {
733 /* initial superblock/root creation */
734 s->s_flags = flags;
735 nfs_clone_super(s, data->sb);
736 }
737
738 mntroot = nfs_get_root(s, data->fh);
739 if (IS_ERR(mntroot)) {
740 error = PTR_ERR(mntroot);
741 goto error_splat_super;
742 }
743
744 s->s_flags |= MS_ACTIVE;
745 mnt->mnt_sb = s;
746 mnt->mnt_root = mntroot;
747
748 dprintk("<-- nfs_xdev_get_sb() = 0\n");
749 return 0;
750
751out_err_nosb:
752 nfs_free_server(server);
753out_err_noserver:
754 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
755 return error;
756
757error_splat_super:
758 up_write(&s->s_umount);
759 deactivate_super(s);
760 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
761 return error;
David Howellsf7b422b2006-06-09 09:34:33 -0400762}
763
764#ifdef CONFIG_NFS_V4
David Howells54ceac42006-08-22 20:06:13 -0400765
766/*
767 * Finish setting up a cloned NFS4 superblock
768 */
769static void nfs4_clone_super(struct super_block *sb,
770 const struct super_block *old_sb)
David Howellsf7b422b2006-06-09 09:34:33 -0400771{
David Howells54ceac42006-08-22 20:06:13 -0400772 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
773 sb->s_blocksize = old_sb->s_blocksize;
774 sb->s_maxbytes = old_sb->s_maxbytes;
775 sb->s_time_gran = 1;
776 sb->s_op = old_sb->s_op;
777 nfs_initialise_sb(sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400778}
779
780/*
781 * Set up an NFS4 superblock
782 */
David Howells54ceac42006-08-22 20:06:13 -0400783static void nfs4_fill_super(struct super_block *sb)
David Howellsf7b422b2006-06-09 09:34:33 -0400784{
David Howellsf7b422b2006-06-09 09:34:33 -0400785 sb->s_time_gran = 1;
David Howellsf7b422b2006-06-09 09:34:33 -0400786 sb->s_op = &nfs4_sops;
David Howells54ceac42006-08-22 20:06:13 -0400787 nfs_initialise_sb(sb);
David Howellsf7b422b2006-06-09 09:34:33 -0400788}
789
David Howells54ceac42006-08-22 20:06:13 -0400790/*
791 * Get the superblock for an NFS4 mountpoint
792 */
Trond Myklebust816724e2006-06-24 08:41:41 -0400793static int nfs4_get_sb(struct file_system_type *fs_type,
794 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -0400795{
David Howellsf7b422b2006-06-09 09:34:33 -0400796 struct nfs4_mount_data *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -0400797 struct super_block *s;
798 struct nfs_server *server;
799 struct sockaddr_in addr;
800 rpc_authflavor_t authflavour;
801 struct nfs_fh mntfh;
802 struct dentry *mntroot;
Chuck Lever29eb9812007-07-01 12:12:30 -0400803 char *p, *mntpath = NULL, *hostname = NULL, *ip_addr = NULL;
David Howells54ceac42006-08-22 20:06:13 -0400804 int error;
David Howellsf7b422b2006-06-09 09:34:33 -0400805
806 if (data == NULL) {
807 dprintk("%s: missing data argument\n", __FUNCTION__);
Trond Myklebust816724e2006-06-24 08:41:41 -0400808 return -EINVAL;
David Howellsf7b422b2006-06-09 09:34:33 -0400809 }
810 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
811 dprintk("%s: bad mount version\n", __FUNCTION__);
Trond Myklebust816724e2006-06-24 08:41:41 -0400812 return -EINVAL;
David Howellsf7b422b2006-06-09 09:34:33 -0400813 }
814
David Howells54ceac42006-08-22 20:06:13 -0400815 /* We now require that the mount process passes the remote address */
816 if (data->host_addrlen != sizeof(addr))
817 return -EINVAL;
818
819 if (copy_from_user(&addr, data->host_addr, sizeof(addr)))
820 return -EFAULT;
821
822 if (addr.sin_family != AF_INET ||
823 addr.sin_addr.s_addr == INADDR_ANY
824 ) {
825 dprintk("%s: mount program didn't pass remote IP address!\n",
826 __FUNCTION__);
827 return -EINVAL;
828 }
Trond Myklebust51b6ded2006-09-15 16:31:56 -0400829 /* RFC3530: The default port for NFS is 2049 */
830 if (addr.sin_port == 0)
Trond Myklebust575b5c72006-10-19 23:28:37 -0700831 addr.sin_port = htons(NFS_PORT);
David Howells54ceac42006-08-22 20:06:13 -0400832
833 /* Grab the authentication type */
834 authflavour = RPC_AUTH_UNIX;
835 if (data->auth_flavourlen != 0) {
836 if (data->auth_flavourlen != 1) {
837 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
838 __FUNCTION__, data->auth_flavourlen);
839 error = -EINVAL;
Chuck Lever29eb9812007-07-01 12:12:30 -0400840 goto out;
David Howells54ceac42006-08-22 20:06:13 -0400841 }
842
843 if (copy_from_user(&authflavour, data->auth_flavours,
844 sizeof(authflavour))) {
845 error = -EFAULT;
Chuck Lever29eb9812007-07-01 12:12:30 -0400846 goto out;
David Howells54ceac42006-08-22 20:06:13 -0400847 }
848 }
David Howellsf7b422b2006-06-09 09:34:33 -0400849
Chuck Lever29eb9812007-07-01 12:12:30 -0400850 p = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
David Howellsf7b422b2006-06-09 09:34:33 -0400851 if (IS_ERR(p))
852 goto out_err;
David Howells54ceac42006-08-22 20:06:13 -0400853 hostname = p;
David Howellsf7b422b2006-06-09 09:34:33 -0400854
Chuck Lever29eb9812007-07-01 12:12:30 -0400855 p = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
David Howellsf7b422b2006-06-09 09:34:33 -0400856 if (IS_ERR(p))
857 goto out_err;
David Howells54ceac42006-08-22 20:06:13 -0400858 mntpath = p;
David Howellsf7b422b2006-06-09 09:34:33 -0400859
David Howells54ceac42006-08-22 20:06:13 -0400860 dprintk("MNTPATH: %s\n", mntpath);
861
Chuck Lever29eb9812007-07-01 12:12:30 -0400862 p = strndup_user(data->client_addr.data, 16);
David Howellsf7b422b2006-06-09 09:34:33 -0400863 if (IS_ERR(p))
864 goto out_err;
Chuck Lever29eb9812007-07-01 12:12:30 -0400865 ip_addr = p;
David Howellsf7b422b2006-06-09 09:34:33 -0400866
David Howells54ceac42006-08-22 20:06:13 -0400867 /* Get a volume representation */
868 server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr,
869 authflavour, &mntfh);
870 if (IS_ERR(server)) {
871 error = PTR_ERR(server);
Chuck Lever29eb9812007-07-01 12:12:30 -0400872 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -0400873 }
874
David Howells54ceac42006-08-22 20:06:13 -0400875 /* Get a superblock - note that we may end up sharing one that already exists */
876 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
Trond Myklebust816724e2006-06-24 08:41:41 -0400877 if (IS_ERR(s)) {
878 error = PTR_ERR(s);
David Howellsf7b422b2006-06-09 09:34:33 -0400879 goto out_free;
Trond Myklebust816724e2006-06-24 08:41:41 -0400880 }
881
Trond Myklebust5dd31772006-08-24 01:03:05 -0400882 if (s->s_fs_info != server) {
883 nfs_free_server(server);
884 server = NULL;
885 }
886
David Howells54ceac42006-08-22 20:06:13 -0400887 if (!s->s_root) {
888 /* initial superblock/root creation */
889 s->s_flags = flags;
David Howells54ceac42006-08-22 20:06:13 -0400890 nfs4_fill_super(s);
Trond Myklebust816724e2006-06-24 08:41:41 -0400891 }
David Howellsf7b422b2006-06-09 09:34:33 -0400892
David Howells54ceac42006-08-22 20:06:13 -0400893 mntroot = nfs4_get_root(s, &mntfh);
894 if (IS_ERR(mntroot)) {
895 error = PTR_ERR(mntroot);
896 goto error_splat_super;
David Howellsf7b422b2006-06-09 09:34:33 -0400897 }
David Howells54ceac42006-08-22 20:06:13 -0400898
David Howellsf7b422b2006-06-09 09:34:33 -0400899 s->s_flags |= MS_ACTIVE;
David Howells54ceac42006-08-22 20:06:13 -0400900 mnt->mnt_sb = s;
901 mnt->mnt_root = mntroot;
Chuck Lever29eb9812007-07-01 12:12:30 -0400902 error = 0;
David Howells54ceac42006-08-22 20:06:13 -0400903
Chuck Lever29eb9812007-07-01 12:12:30 -0400904out:
905 kfree(ip_addr);
David Howells54ceac42006-08-22 20:06:13 -0400906 kfree(mntpath);
907 kfree(hostname);
Trond Myklebust816724e2006-06-24 08:41:41 -0400908 return error;
David Howells54ceac42006-08-22 20:06:13 -0400909
Chuck Lever29eb9812007-07-01 12:12:30 -0400910out_err:
911 error = PTR_ERR(p);
912 goto out;
913
914out_free:
915 nfs_free_server(server);
916 goto out;
917
David Howells54ceac42006-08-22 20:06:13 -0400918error_splat_super:
919 up_write(&s->s_umount);
920 deactivate_super(s);
Chuck Lever29eb9812007-07-01 12:12:30 -0400921 goto out;
David Howellsf7b422b2006-06-09 09:34:33 -0400922}
923
924static void nfs4_kill_super(struct super_block *sb)
925{
926 struct nfs_server *server = NFS_SB(sb);
927
928 nfs_return_all_delegations(sb);
929 kill_anon_super(sb);
930
931 nfs4_renewd_prepare_shutdown(server);
David Howells54ceac42006-08-22 20:06:13 -0400932 nfs_free_server(server);
David Howellsf7b422b2006-06-09 09:34:33 -0400933}
934
935/*
David Howells54ceac42006-08-22 20:06:13 -0400936 * Clone an NFS4 server record on xdev traversal (FSID-change)
David Howellsf7b422b2006-06-09 09:34:33 -0400937 */
David Howells54ceac42006-08-22 20:06:13 -0400938static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
939 const char *dev_name, void *raw_data,
940 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -0400941{
942 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -0400943 struct super_block *s;
944 struct nfs_server *server;
945 struct dentry *mntroot;
946 int error;
947
948 dprintk("--> nfs4_xdev_get_sb()\n");
949
950 /* create a new volume representation */
951 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
952 if (IS_ERR(server)) {
953 error = PTR_ERR(server);
954 goto out_err_noserver;
955 }
956
957 /* Get a superblock - note that we may end up sharing one that already exists */
958 s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
959 if (IS_ERR(s)) {
960 error = PTR_ERR(s);
961 goto out_err_nosb;
962 }
963
964 if (s->s_fs_info != server) {
965 nfs_free_server(server);
966 server = NULL;
967 }
968
969 if (!s->s_root) {
970 /* initial superblock/root creation */
971 s->s_flags = flags;
972 nfs4_clone_super(s, data->sb);
973 }
974
975 mntroot = nfs4_get_root(s, data->fh);
976 if (IS_ERR(mntroot)) {
977 error = PTR_ERR(mntroot);
978 goto error_splat_super;
979 }
980
981 s->s_flags |= MS_ACTIVE;
982 mnt->mnt_sb = s;
983 mnt->mnt_root = mntroot;
984
985 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
986 return 0;
987
988out_err_nosb:
989 nfs_free_server(server);
990out_err_noserver:
991 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
992 return error;
993
994error_splat_super:
995 up_write(&s->s_umount);
996 deactivate_super(s);
997 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
998 return error;
David Howellsf7b422b2006-06-09 09:34:33 -0400999}
1000
David Howells54ceac42006-08-22 20:06:13 -04001001/*
1002 * Create an NFS4 server record on referral traversal
1003 */
1004static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
1005 const char *dev_name, void *raw_data,
1006 struct vfsmount *mnt)
David Howellsf7b422b2006-06-09 09:34:33 -04001007{
1008 struct nfs_clone_mount *data = raw_data;
David Howells54ceac42006-08-22 20:06:13 -04001009 struct super_block *s;
1010 struct nfs_server *server;
1011 struct dentry *mntroot;
1012 struct nfs_fh mntfh;
1013 int error;
1014
1015 dprintk("--> nfs4_referral_get_sb()\n");
1016
1017 /* create a new volume representation */
1018 server = nfs4_create_referral_server(data, &mntfh);
1019 if (IS_ERR(server)) {
1020 error = PTR_ERR(server);
1021 goto out_err_noserver;
1022 }
1023
1024 /* Get a superblock - note that we may end up sharing one that already exists */
1025 s = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
1026 if (IS_ERR(s)) {
1027 error = PTR_ERR(s);
1028 goto out_err_nosb;
1029 }
1030
1031 if (s->s_fs_info != server) {
1032 nfs_free_server(server);
1033 server = NULL;
1034 }
1035
1036 if (!s->s_root) {
1037 /* initial superblock/root creation */
1038 s->s_flags = flags;
1039 nfs4_fill_super(s);
1040 }
1041
Trond Myklebustf2d0d852007-02-02 14:46:09 -08001042 mntroot = nfs4_get_root(s, &mntfh);
David Howells54ceac42006-08-22 20:06:13 -04001043 if (IS_ERR(mntroot)) {
1044 error = PTR_ERR(mntroot);
1045 goto error_splat_super;
1046 }
1047
1048 s->s_flags |= MS_ACTIVE;
1049 mnt->mnt_sb = s;
1050 mnt->mnt_root = mntroot;
1051
1052 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1053 return 0;
1054
1055out_err_nosb:
1056 nfs_free_server(server);
1057out_err_noserver:
1058 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
1059 return error;
1060
1061error_splat_super:
1062 up_write(&s->s_umount);
1063 deactivate_super(s);
1064 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
1065 return error;
David Howellsf7b422b2006-06-09 09:34:33 -04001066}
1067
David Howells54ceac42006-08-22 20:06:13 -04001068#endif /* CONFIG_NFS_V4 */