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NFS: Add extra const qualifiers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / super.c
blobc97f30967955b4d9c7d3784357cff8984ee507ab
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 */
17
18 #include <linux/config.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21
22 #include <linux/time.h>
23 #include <linux/kernel.h>
24 #include <linux/mm.h>
25 #include <linux/string.h>
26 #include <linux/stat.h>
27 #include <linux/errno.h>
28 #include <linux/unistd.h>
29 #include <linux/sunrpc/clnt.h>
30 #include <linux/sunrpc/stats.h>
31 #include <linux/sunrpc/metrics.h>
32 #include <linux/nfs_fs.h>
33 #include <linux/nfs_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/lockd/bind.h>
36 #include <linux/smp_lock.h>
37 #include <linux/seq_file.h>
38 #include <linux/mount.h>
39 #include <linux/nfs_idmap.h>
40 #include <linux/vfs.h>
41 #include <linux/inet.h>
42 #include <linux/nfs_xdr.h>
43
44 #include <asm/system.h>
45 #include <asm/uaccess.h>
46
47 #include "nfs4_fs.h"
48 #include "callback.h"
49 #include "delegation.h"
50 #include "iostat.h"
51 #include "internal.h"
52
53 #define NFSDBG_FACILITY NFSDBG_VFS
54
55 /* Maximum number of readahead requests
56 * FIXME: this should really be a sysctl so that users may tune it to suit
57 * their needs. People that do NFS over a slow network, might for
58 * instance want to reduce it to something closer to 1 for improved
59 * interactive response.
60 */
61 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
62
63 /*
64 * RPC cruft for NFS
65 */
66 static struct rpc_version * nfs_version[] = {
67 NULL,
68 NULL,
69 &nfs_version2,
70 #if defined(CONFIG_NFS_V3)
71 &nfs_version3,
72 #elif defined(CONFIG_NFS_V4)
73 NULL,
74 #endif
75 #if defined(CONFIG_NFS_V4)
76 &nfs_version4,
77 #endif
78 };
79
80 static struct rpc_program nfs_program = {
81 .name = "nfs",
82 .number = NFS_PROGRAM,
83 .nrvers = ARRAY_SIZE(nfs_version),
84 .version = nfs_version,
85 .stats = &nfs_rpcstat,
86 .pipe_dir_name = "/nfs",
87 };
88
89 struct rpc_stat nfs_rpcstat = {
90 .program = &nfs_program
91 };
92
93
94 #ifdef CONFIG_NFS_V3_ACL
95 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
96 static struct rpc_version * nfsacl_version[] = {
97 [3] = &nfsacl_version3,
98 };
99
100 struct rpc_program nfsacl_program = {
101 .name = "nfsacl",
102 .number = NFS_ACL_PROGRAM,
103 .nrvers = ARRAY_SIZE(nfsacl_version),
104 .version = nfsacl_version,
105 .stats = &nfsacl_rpcstat,
106 };
107 #endif /* CONFIG_NFS_V3_ACL */
108
109 static void nfs_umount_begin(struct vfsmount *, int);
110 static int nfs_statfs(struct dentry *, struct kstatfs *);
111 static int nfs_show_options(struct seq_file *, struct vfsmount *);
112 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
113 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
114 static int nfs_clone_nfs_sb(struct file_system_type *fs_type,
115 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
116 static void nfs_kill_super(struct super_block *);
117
118 static struct file_system_type nfs_fs_type = {
119 .owner = THIS_MODULE,
120 .name = "nfs",
121 .get_sb = nfs_get_sb,
122 .kill_sb = nfs_kill_super,
123 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
124 };
125
126 struct file_system_type clone_nfs_fs_type = {
127 .owner = THIS_MODULE,
128 .name = "nfs",
129 .get_sb = nfs_clone_nfs_sb,
130 .kill_sb = nfs_kill_super,
131 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
132 };
133
134 static struct super_operations nfs_sops = {
135 .alloc_inode = nfs_alloc_inode,
136 .destroy_inode = nfs_destroy_inode,
137 .write_inode = nfs_write_inode,
138 .statfs = nfs_statfs,
139 .clear_inode = nfs_clear_inode,
140 .umount_begin = nfs_umount_begin,
141 .show_options = nfs_show_options,
142 .show_stats = nfs_show_stats,
143 };
144
145 #ifdef CONFIG_NFS_V4
146 static int nfs4_get_sb(struct file_system_type *fs_type,
147 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
148 static int nfs_clone_nfs4_sb(struct file_system_type *fs_type,
149 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
150 static int nfs_referral_nfs4_sb(struct file_system_type *fs_type,
151 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
152 static void nfs4_kill_super(struct super_block *sb);
153
154 static struct file_system_type nfs4_fs_type = {
155 .owner = THIS_MODULE,
156 .name = "nfs4",
157 .get_sb = nfs4_get_sb,
158 .kill_sb = nfs4_kill_super,
159 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
160 };
161
162 struct file_system_type clone_nfs4_fs_type = {
163 .owner = THIS_MODULE,
164 .name = "nfs4",
165 .get_sb = nfs_clone_nfs4_sb,
166 .kill_sb = nfs4_kill_super,
167 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
168 };
169
170 struct file_system_type nfs_referral_nfs4_fs_type = {
171 .owner = THIS_MODULE,
172 .name = "nfs4",
173 .get_sb = nfs_referral_nfs4_sb,
174 .kill_sb = nfs4_kill_super,
175 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
176 };
177
178 static struct super_operations nfs4_sops = {
179 .alloc_inode = nfs_alloc_inode,
180 .destroy_inode = nfs_destroy_inode,
181 .write_inode = nfs_write_inode,
182 .statfs = nfs_statfs,
183 .clear_inode = nfs4_clear_inode,
184 .umount_begin = nfs_umount_begin,
185 .show_options = nfs_show_options,
186 .show_stats = nfs_show_stats,
187 };
188 #endif
189
190 static struct shrinker *acl_shrinker;
191
192 /*
193 * Register the NFS filesystems
194 */
195 int __init register_nfs_fs(void)
196 {
197 int ret;
198
199 ret = register_filesystem(&nfs_fs_type);
200 if (ret < 0)
201 goto error_0;
202
203 #ifdef CONFIG_NFS_V4
204 ret = nfs_register_sysctl();
205 if (ret < 0)
206 goto error_1;
207 ret = register_filesystem(&nfs4_fs_type);
208 if (ret < 0)
209 goto error_2;
210 #endif
211 acl_shrinker = set_shrinker(DEFAULT_SEEKS, nfs_access_cache_shrinker);
212 return 0;
213
214 #ifdef CONFIG_NFS_V4
215 error_2:
216 nfs_unregister_sysctl();
217 error_1:
218 unregister_filesystem(&nfs_fs_type);
219 #endif
220 error_0:
221 return ret;
222 }
223
224 /*
225 * Unregister the NFS filesystems
226 */
227 void __exit unregister_nfs_fs(void)
228 {
229 if (acl_shrinker != NULL)
230 remove_shrinker(acl_shrinker);
231 #ifdef CONFIG_NFS_V4
232 unregister_filesystem(&nfs4_fs_type);
233 nfs_unregister_sysctl();
234 #endif
235 unregister_filesystem(&nfs_fs_type);
236 }
237
238 /*
239 * Deliver file system statistics to userspace
240 */
241 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
242 {
243 struct nfs_server *server = NFS_SB(dentry->d_sb);
244 unsigned char blockbits;
245 unsigned long blockres;
246 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
247 struct nfs_fattr fattr;
248 struct nfs_fsstat res = {
249 .fattr = &fattr,
250 };
251 int error;
252
253 lock_kernel();
254
255 error = server->rpc_ops->statfs(server, fh, &res);
256 buf->f_type = NFS_SUPER_MAGIC;
257 if (error < 0)
258 goto out_err;
259
260 /*
261 * Current versions of glibc do not correctly handle the
262 * case where f_frsize != f_bsize. Eventually we want to
263 * report the value of wtmult in this field.
264 */
265 buf->f_frsize = dentry->d_sb->s_blocksize;
266
267 /*
268 * On most *nix systems, f_blocks, f_bfree, and f_bavail
269 * are reported in units of f_frsize. Linux hasn't had
270 * an f_frsize field in its statfs struct until recently,
271 * thus historically Linux's sys_statfs reports these
272 * fields in units of f_bsize.
273 */
274 buf->f_bsize = dentry->d_sb->s_blocksize;
275 blockbits = dentry->d_sb->s_blocksize_bits;
276 blockres = (1 << blockbits) - 1;
277 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
278 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
279 buf->f_bavail = (res.abytes + blockres) >> blockbits;
280
281 buf->f_files = res.tfiles;
282 buf->f_ffree = res.afiles;
283
284 buf->f_namelen = server->namelen;
285 out:
286 unlock_kernel();
287 return 0;
288
289 out_err:
290 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
291 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
292 goto out;
293
294 }
295
296 /*
297 * Map the security flavour number to a name
298 */
299 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
300 {
301 static const struct {
302 rpc_authflavor_t flavour;
303 const char *str;
304 } sec_flavours[] = {
305 { RPC_AUTH_NULL, "null" },
306 { RPC_AUTH_UNIX, "sys" },
307 { RPC_AUTH_GSS_KRB5, "krb5" },
308 { RPC_AUTH_GSS_KRB5I, "krb5i" },
309 { RPC_AUTH_GSS_KRB5P, "krb5p" },
310 { RPC_AUTH_GSS_LKEY, "lkey" },
311 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
312 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
313 { RPC_AUTH_GSS_SPKM, "spkm" },
314 { RPC_AUTH_GSS_SPKMI, "spkmi" },
315 { RPC_AUTH_GSS_SPKMP, "spkmp" },
316 { -1, "unknown" }
317 };
318 int i;
319
320 for (i=0; sec_flavours[i].flavour != -1; i++) {
321 if (sec_flavours[i].flavour == flavour)
322 break;
323 }
324 return sec_flavours[i].str;
325 }
326
327 /*
328 * Describe the mount options in force on this server representation
329 */
330 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
331 {
332 static const struct proc_nfs_info {
333 int flag;
334 const char *str;
335 const char *nostr;
336 } nfs_info[] = {
337 { NFS_MOUNT_SOFT, ",soft", ",hard" },
338 { NFS_MOUNT_INTR, ",intr", "" },
339 { NFS_MOUNT_NOCTO, ",nocto", "" },
340 { NFS_MOUNT_NOAC, ",noac", "" },
341 { NFS_MOUNT_NONLM, ",nolock", "" },
342 { NFS_MOUNT_NOACL, ",noacl", "" },
343 { 0, NULL, NULL }
344 };
345 const struct proc_nfs_info *nfs_infop;
346 char buf[12];
347 const char *proto;
348
349 seq_printf(m, ",vers=%d", nfss->rpc_ops->version);
350 seq_printf(m, ",rsize=%d", nfss->rsize);
351 seq_printf(m, ",wsize=%d", nfss->wsize);
352 if (nfss->acregmin != 3*HZ || showdefaults)
353 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
354 if (nfss->acregmax != 60*HZ || showdefaults)
355 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
356 if (nfss->acdirmin != 30*HZ || showdefaults)
357 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
358 if (nfss->acdirmax != 60*HZ || showdefaults)
359 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
360 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
361 if (nfss->flags & nfs_infop->flag)
362 seq_puts(m, nfs_infop->str);
363 else
364 seq_puts(m, nfs_infop->nostr);
365 }
366 switch (nfss->client->cl_xprt->prot) {
367 case IPPROTO_TCP:
368 proto = "tcp";
369 break;
370 case IPPROTO_UDP:
371 proto = "udp";
372 break;
373 default:
374 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
375 proto = buf;
376 }
377 seq_printf(m, ",proto=%s", proto);
378 seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ);
379 seq_printf(m, ",retrans=%u", nfss->retrans_count);
380 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
381 }
382
383 /*
384 * Describe the mount options on this VFS mountpoint
385 */
386 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
387 {
388 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
389
390 nfs_show_mount_options(m, nfss, 0);
391
392 seq_puts(m, ",addr=");
393 seq_escape(m, nfss->hostname, " \t\n\\");
394
395 return 0;
396 }
397
398 /*
399 * Present statistical information for this VFS mountpoint
400 */
401 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
402 {
403 int i, cpu;
404 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
405 struct rpc_auth *auth = nfss->client->cl_auth;
406 struct nfs_iostats totals = { };
407
408 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
409
410 /*
411 * Display all mount option settings
412 */
413 seq_printf(m, "\n\topts:\t");
414 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
415 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
416 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
417 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
418 nfs_show_mount_options(m, nfss, 1);
419
420 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
421
422 seq_printf(m, "\n\tcaps:\t");
423 seq_printf(m, "caps=0x%x", nfss->caps);
424 seq_printf(m, ",wtmult=%d", nfss->wtmult);
425 seq_printf(m, ",dtsize=%d", nfss->dtsize);
426 seq_printf(m, ",bsize=%d", nfss->bsize);
427 seq_printf(m, ",namelen=%d", nfss->namelen);
428
429 #ifdef CONFIG_NFS_V4
430 if (nfss->rpc_ops->version == 4) {
431 seq_printf(m, "\n\tnfsv4:\t");
432 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
433 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
434 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
435 }
436 #endif
437
438 /*
439 * Display security flavor in effect for this mount
440 */
441 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
442 if (auth->au_flavor)
443 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
444
445 /*
446 * Display superblock I/O counters
447 */
448 for_each_possible_cpu(cpu) {
449 struct nfs_iostats *stats;
450
451 preempt_disable();
452 stats = per_cpu_ptr(nfss->io_stats, cpu);
453
454 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
455 totals.events[i] += stats->events[i];
456 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
457 totals.bytes[i] += stats->bytes[i];
458
459 preempt_enable();
460 }
461
462 seq_printf(m, "\n\tevents:\t");
463 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
464 seq_printf(m, "%lu ", totals.events[i]);
465 seq_printf(m, "\n\tbytes:\t");
466 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
467 seq_printf(m, "%Lu ", totals.bytes[i]);
468 seq_printf(m, "\n");
469
470 rpc_print_iostats(m, nfss->client);
471
472 return 0;
473 }
474
475 /*
476 * Begin unmount by attempting to remove all automounted mountpoints we added
477 * in response to traversals
478 */
479 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
480 {
481 struct nfs_server *server;
482 struct rpc_clnt *rpc;
483
484 shrink_submounts(vfsmnt, &nfs_automount_list);
485 if (!(flags & MNT_FORCE))
486 return;
487 /* -EIO all pending I/O */
488 server = NFS_SB(vfsmnt->mnt_sb);
489 rpc = server->client;
490 if (!IS_ERR(rpc))
491 rpc_killall_tasks(rpc);
492 rpc = server->client_acl;
493 if (!IS_ERR(rpc))
494 rpc_killall_tasks(rpc);
495 }
496
497 /*
498 * Obtain the root inode of the file system.
499 */
500 static struct inode *
501 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
502 {
503 struct nfs_server *server = NFS_SB(sb);
504 int error;
505
506 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
507 if (error < 0) {
508 dprintk("nfs_get_root: getattr error = %d\n", -error);
509 return ERR_PTR(error);
510 }
511
512 server->fsid = fsinfo->fattr->fsid;
513 return nfs_fhget(sb, rootfh, fsinfo->fattr);
514 }
515
516 /*
517 * Do NFS version-independent mount processing, and sanity checking
518 */
519 static int
520 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
521 {
522 struct nfs_server *server;
523 struct inode *root_inode;
524 struct nfs_fattr fattr;
525 struct nfs_fsinfo fsinfo = {
526 .fattr = &fattr,
527 };
528 struct nfs_pathconf pathinfo = {
529 .fattr = &fattr,
530 };
531 int no_root_error = 0;
532 unsigned long max_rpc_payload;
533
534 /* We probably want something more informative here */
535 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
536
537 server = NFS_SB(sb);
538
539 sb->s_magic = NFS_SUPER_MAGIC;
540
541 server->io_stats = nfs_alloc_iostats();
542 if (server->io_stats == NULL)
543 return -ENOMEM;
544
545 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
546 /* Did getting the root inode fail? */
547 if (IS_ERR(root_inode)) {
548 no_root_error = PTR_ERR(root_inode);
549 goto out_no_root;
550 }
551 sb->s_root = d_alloc_root(root_inode);
552 if (!sb->s_root) {
553 no_root_error = -ENOMEM;
554 goto out_no_root;
555 }
556 sb->s_root->d_op = server->rpc_ops->dentry_ops;
557
558 /* mount time stamp, in seconds */
559 server->mount_time = jiffies;
560
561 /* Get some general file system info */
562 if (server->namelen == 0 &&
563 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
564 server->namelen = pathinfo.max_namelen;
565 /* Work out a lot of parameters */
566 if (server->rsize == 0)
567 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
568 if (server->wsize == 0)
569 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
570
571 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
572 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
573 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
574 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
575
576 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
577 if (server->rsize > max_rpc_payload)
578 server->rsize = max_rpc_payload;
579 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
580 server->rsize = NFS_MAX_FILE_IO_SIZE;
581 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
582
583 if (server->wsize > max_rpc_payload)
584 server->wsize = max_rpc_payload;
585 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
586 server->wsize = NFS_MAX_FILE_IO_SIZE;
587 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
588
589 if (sb->s_blocksize == 0)
590 sb->s_blocksize = nfs_block_bits(server->wsize,
591 &sb->s_blocksize_bits);
592 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
593
594 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
595 if (server->dtsize > PAGE_CACHE_SIZE)
596 server->dtsize = PAGE_CACHE_SIZE;
597 if (server->dtsize > server->rsize)
598 server->dtsize = server->rsize;
599
600 if (server->flags & NFS_MOUNT_NOAC) {
601 server->acregmin = server->acregmax = 0;
602 server->acdirmin = server->acdirmax = 0;
603 sb->s_flags |= MS_SYNCHRONOUS;
604 }
605 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
606
607 nfs_super_set_maxbytes(sb, fsinfo.maxfilesize);
608
609 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
610 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
611
612 /* We're airborne Set socket buffersize */
613 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
614 return 0;
615 /* Yargs. It didn't work out. */
616 out_no_root:
617 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
618 if (!IS_ERR(root_inode))
619 iput(root_inode);
620 return no_root_error;
621 }
622
623 /*
624 * Initialise the timeout values for a connection
625 */
626 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
627 {
628 to->to_initval = timeo * HZ / 10;
629 to->to_retries = retrans;
630 if (!to->to_retries)
631 to->to_retries = 2;
632
633 switch (proto) {
634 case IPPROTO_TCP:
635 if (!to->to_initval)
636 to->to_initval = 60 * HZ;
637 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
638 to->to_initval = NFS_MAX_TCP_TIMEOUT;
639 to->to_increment = to->to_initval;
640 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
641 to->to_exponential = 0;
642 break;
643 case IPPROTO_UDP:
644 default:
645 if (!to->to_initval)
646 to->to_initval = 11 * HZ / 10;
647 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
648 to->to_initval = NFS_MAX_UDP_TIMEOUT;
649 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
650 to->to_exponential = 1;
651 break;
652 }
653 }
654
655 /*
656 * Create an RPC client handle.
657 */
658 static struct rpc_clnt *
659 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
660 {
661 struct rpc_timeout timeparms;
662 struct rpc_xprt *xprt = NULL;
663 struct rpc_clnt *clnt = NULL;
664 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
665
666 nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
667
668 server->retrans_timeo = timeparms.to_initval;
669 server->retrans_count = timeparms.to_retries;
670
671 /* create transport and client */
672 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
673 if (IS_ERR(xprt)) {
674 dprintk("%s: cannot create RPC transport. Error = %ld\n",
675 __FUNCTION__, PTR_ERR(xprt));
676 return (struct rpc_clnt *)xprt;
677 }
678 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
679 server->rpc_ops->version, data->pseudoflavor);
680 if (IS_ERR(clnt)) {
681 dprintk("%s: cannot create RPC client. Error = %ld\n",
682 __FUNCTION__, PTR_ERR(xprt));
683 goto out_fail;
684 }
685
686 clnt->cl_intr = 1;
687 clnt->cl_softrtry = 1;
688
689 return clnt;
690
691 out_fail:
692 return clnt;
693 }
694
695 /*
696 * Clone a server record
697 */
698 static struct nfs_server *nfs_clone_server(struct super_block *sb, struct nfs_clone_mount *data)
699 {
700 struct nfs_server *server = NFS_SB(sb);
701 struct nfs_server *parent = NFS_SB(data->sb);
702 struct inode *root_inode;
703 struct nfs_fsinfo fsinfo;
704 void *err = ERR_PTR(-ENOMEM);
705
706 sb->s_op = data->sb->s_op;
707 sb->s_blocksize = data->sb->s_blocksize;
708 sb->s_blocksize_bits = data->sb->s_blocksize_bits;
709 sb->s_maxbytes = data->sb->s_maxbytes;
710
711 server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
712 server->io_stats = nfs_alloc_iostats();
713 if (server->io_stats == NULL)
714 goto out;
715
716 server->client = rpc_clone_client(parent->client);
717 if (IS_ERR((err = server->client)))
718 goto out;
719
720 if (!IS_ERR(parent->client_sys)) {
721 server->client_sys = rpc_clone_client(parent->client_sys);
722 if (IS_ERR((err = server->client_sys)))
723 goto out;
724 }
725 if (!IS_ERR(parent->client_acl)) {
726 server->client_acl = rpc_clone_client(parent->client_acl);
727 if (IS_ERR((err = server->client_acl)))
728 goto out;
729 }
730 root_inode = nfs_fhget(sb, data->fh, data->fattr);
731 if (!root_inode)
732 goto out;
733 sb->s_root = d_alloc_root(root_inode);
734 if (!sb->s_root)
735 goto out_put_root;
736 fsinfo.fattr = data->fattr;
737 if (NFS_PROTO(root_inode)->fsinfo(server, data->fh, &fsinfo) == 0)
738 nfs_super_set_maxbytes(sb, fsinfo.maxfilesize);
739 sb->s_root->d_op = server->rpc_ops->dentry_ops;
740 sb->s_flags |= MS_ACTIVE;
741 return server;
742 out_put_root:
743 iput(root_inode);
744 out:
745 return err;
746 }
747
748 /*
749 * Copy an existing superblock and attach revised data
750 */
751 static int nfs_clone_generic_sb(struct nfs_clone_mount *data,
752 struct super_block *(*fill_sb)(struct nfs_server *, struct nfs_clone_mount *),
753 struct nfs_server *(*fill_server)(struct super_block *, struct nfs_clone_mount *),
754 struct vfsmount *mnt)
755 {
756 struct nfs_server *server;
757 struct nfs_server *parent = NFS_SB(data->sb);
758 struct super_block *sb = ERR_PTR(-EINVAL);
759 char *hostname;
760 int error = -ENOMEM;
761 int len;
762
763 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
764 if (server == NULL)
765 goto out_err;
766 memcpy(server, parent, sizeof(*server));
767 hostname = (data->hostname != NULL) ? data->hostname : parent->hostname;
768 len = strlen(hostname) + 1;
769 server->hostname = kmalloc(len, GFP_KERNEL);
770 if (server->hostname == NULL)
771 goto free_server;
772 memcpy(server->hostname, hostname, len);
773 error = rpciod_up();
774 if (error != 0)
775 goto free_hostname;
776
777 sb = fill_sb(server, data);
778 if (IS_ERR(sb)) {
779 error = PTR_ERR(sb);
780 goto kill_rpciod;
781 }
782
783 if (sb->s_root)
784 goto out_rpciod_down;
785
786 server = fill_server(sb, data);
787 if (IS_ERR(server)) {
788 error = PTR_ERR(server);
789 goto out_deactivate;
790 }
791 return simple_set_mnt(mnt, sb);
792 out_deactivate:
793 up_write(&sb->s_umount);
794 deactivate_super(sb);
795 return error;
796 out_rpciod_down:
797 rpciod_down();
798 kfree(server->hostname);
799 kfree(server);
800 return simple_set_mnt(mnt, sb);
801 kill_rpciod:
802 rpciod_down();
803 free_hostname:
804 kfree(server->hostname);
805 free_server:
806 kfree(server);
807 out_err:
808 return error;
809 }
810
811 /*
812 * Set up an NFS2/3 superblock
813 *
814 * The way this works is that the mount process passes a structure
815 * in the data argument which contains the server's IP address
816 * and the root file handle obtained from the server's mount
817 * daemon. We stash these away in the private superblock fields.
818 */
819 static int
820 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
821 {
822 struct nfs_server *server;
823 rpc_authflavor_t authflavor;
824
825 server = NFS_SB(sb);
826 sb->s_blocksize_bits = 0;
827 sb->s_blocksize = 0;
828 if (data->bsize)
829 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
830 if (data->rsize)
831 server->rsize = nfs_block_size(data->rsize, NULL);
832 if (data->wsize)
833 server->wsize = nfs_block_size(data->wsize, NULL);
834 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
835
836 server->acregmin = data->acregmin*HZ;
837 server->acregmax = data->acregmax*HZ;
838 server->acdirmin = data->acdirmin*HZ;
839 server->acdirmax = data->acdirmax*HZ;
840
841 /* Start lockd here, before we might error out */
842 if (!(server->flags & NFS_MOUNT_NONLM))
843 lockd_up();
844
845 server->namelen = data->namlen;
846 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
847 if (!server->hostname)
848 return -ENOMEM;
849 strcpy(server->hostname, data->hostname);
850
851 /* Check NFS protocol revision and initialize RPC op vector
852 * and file handle pool. */
853 #ifdef CONFIG_NFS_V3
854 if (server->flags & NFS_MOUNT_VER3) {
855 server->rpc_ops = &nfs_v3_clientops;
856 server->caps |= NFS_CAP_READDIRPLUS;
857 } else {
858 server->rpc_ops = &nfs_v2_clientops;
859 }
860 #else
861 server->rpc_ops = &nfs_v2_clientops;
862 #endif
863
864 /* Fill in pseudoflavor for mount version < 5 */
865 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
866 data->pseudoflavor = RPC_AUTH_UNIX;
867 authflavor = data->pseudoflavor; /* save for sb_init() */
868 /* XXX maybe we want to add a server->pseudoflavor field */
869
870 /* Create RPC client handles */
871 server->client = nfs_create_client(server, data);
872 if (IS_ERR(server->client))
873 return PTR_ERR(server->client);
874 /* RFC 2623, sec 2.3.2 */
875 if (authflavor != RPC_AUTH_UNIX) {
876 struct rpc_auth *auth;
877
878 server->client_sys = rpc_clone_client(server->client);
879 if (IS_ERR(server->client_sys))
880 return PTR_ERR(server->client_sys);
881 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
882 if (IS_ERR(auth))
883 return PTR_ERR(auth);
884 } else {
885 atomic_inc(&server->client->cl_count);
886 server->client_sys = server->client;
887 }
888 if (server->flags & NFS_MOUNT_VER3) {
889 #ifdef CONFIG_NFS_V3_ACL
890 if (!(server->flags & NFS_MOUNT_NOACL)) {
891 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
892 /* No errors! Assume that Sun nfsacls are supported */
893 if (!IS_ERR(server->client_acl))
894 server->caps |= NFS_CAP_ACLS;
895 }
896 #else
897 server->flags &= ~NFS_MOUNT_NOACL;
898 #endif /* CONFIG_NFS_V3_ACL */
899 /*
900 * The VFS shouldn't apply the umask to mode bits. We will
901 * do so ourselves when necessary.
902 */
903 sb->s_flags |= MS_POSIXACL;
904 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
905 server->namelen = NFS3_MAXNAMLEN;
906 sb->s_time_gran = 1;
907 } else {
908 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
909 server->namelen = NFS2_MAXNAMLEN;
910 }
911
912 sb->s_op = &nfs_sops;
913 return nfs_sb_init(sb, authflavor);
914 }
915
916 static int nfs_set_super(struct super_block *s, void *data)
917 {
918 s->s_fs_info = data;
919 return set_anon_super(s, data);
920 }
921
922 static int nfs_compare_super(struct super_block *sb, void *data)
923 {
924 struct nfs_server *server = data;
925 struct nfs_server *old = NFS_SB(sb);
926
927 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
928 return 0;
929 if (old->addr.sin_port != server->addr.sin_port)
930 return 0;
931 return !nfs_compare_fh(&old->fh, &server->fh);
932 }
933
934 static int nfs_get_sb(struct file_system_type *fs_type,
935 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
936 {
937 int error;
938 struct nfs_server *server = NULL;
939 struct super_block *s;
940 struct nfs_fh *root;
941 struct nfs_mount_data *data = raw_data;
942
943 error = -EINVAL;
944 if (data == NULL) {
945 dprintk("%s: missing data argument\n", __FUNCTION__);
946 goto out_err_noserver;
947 }
948 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
949 dprintk("%s: bad mount version\n", __FUNCTION__);
950 goto out_err_noserver;
951 }
952 switch (data->version) {
953 case 1:
954 data->namlen = 0;
955 case 2:
956 data->bsize = 0;
957 case 3:
958 if (data->flags & NFS_MOUNT_VER3) {
959 dprintk("%s: mount structure version %d does not support NFSv3\n",
960 __FUNCTION__,
961 data->version);
962 goto out_err_noserver;
963 }
964 data->root.size = NFS2_FHSIZE;
965 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
966 case 4:
967 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
968 dprintk("%s: mount structure version %d does not support strong security\n",
969 __FUNCTION__,
970 data->version);
971 goto out_err_noserver;
972 }
973 case 5:
974 memset(data->context, 0, sizeof(data->context));
975 }
976 #ifndef CONFIG_NFS_V3
977 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
978 error = -EPROTONOSUPPORT;
979 if (data->flags & NFS_MOUNT_VER3) {
980 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
981 goto out_err_noserver;
982 }
983 #endif /* CONFIG_NFS_V3 */
984
985 error = -ENOMEM;
986 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
987 if (!server)
988 goto out_err_noserver;
989 /* Zero out the NFS state stuff */
990 init_nfsv4_state(server);
991 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
992
993 root = &server->fh;
994 if (data->flags & NFS_MOUNT_VER3)
995 root->size = data->root.size;
996 else
997 root->size = NFS2_FHSIZE;
998 error = -EINVAL;
999 if (root->size > sizeof(root->data)) {
1000 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1001 goto out_err;
1002 }
1003 memcpy(root->data, data->root.data, root->size);
1004
1005 /* We now require that the mount process passes the remote address */
1006 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1007 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1008 dprintk("%s: mount program didn't pass remote address!\n",
1009 __FUNCTION__);
1010 goto out_err;
1011 }
1012
1013 /* Fire up rpciod if not yet running */
1014 error = rpciod_up();
1015 if (error < 0) {
1016 dprintk("%s: couldn't start rpciod! Error = %d\n",
1017 __FUNCTION__, error);
1018 goto out_err;
1019 }
1020
1021 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1022 if (IS_ERR(s)) {
1023 error = PTR_ERR(s);
1024 goto out_err_rpciod;
1025 }
1026
1027 if (s->s_root)
1028 goto out_rpciod_down;
1029
1030 s->s_flags = flags;
1031
1032 error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1033 if (error) {
1034 up_write(&s->s_umount);
1035 deactivate_super(s);
1036 return error;
1037 }
1038 s->s_flags |= MS_ACTIVE;
1039 return simple_set_mnt(mnt, s);
1040
1041 out_rpciod_down:
1042 rpciod_down();
1043 kfree(server);
1044 return simple_set_mnt(mnt, s);
1045
1046 out_err_rpciod:
1047 rpciod_down();
1048 out_err:
1049 kfree(server);
1050 out_err_noserver:
1051 return error;
1052 }
1053
1054 static void nfs_kill_super(struct super_block *s)
1055 {
1056 struct nfs_server *server = NFS_SB(s);
1057
1058 kill_anon_super(s);
1059
1060 if (!IS_ERR(server->client))
1061 rpc_shutdown_client(server->client);
1062 if (!IS_ERR(server->client_sys))
1063 rpc_shutdown_client(server->client_sys);
1064 if (!IS_ERR(server->client_acl))
1065 rpc_shutdown_client(server->client_acl);
1066
1067 if (!(server->flags & NFS_MOUNT_NONLM))
1068 lockd_down(); /* release rpc.lockd */
1069
1070 rpciod_down(); /* release rpciod */
1071
1072 nfs_free_iostats(server->io_stats);
1073 kfree(server->hostname);
1074 kfree(server);
1075 nfs_release_automount_timer();
1076 }
1077
1078 static struct super_block *nfs_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1079 {
1080 struct super_block *sb;
1081
1082 server->fsid = data->fattr->fsid;
1083 nfs_copy_fh(&server->fh, data->fh);
1084 sb = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
1085 if (!IS_ERR(sb) && sb->s_root == NULL && !(server->flags & NFS_MOUNT_NONLM))
1086 lockd_up();
1087 return sb;
1088 }
1089
1090 static int nfs_clone_nfs_sb(struct file_system_type *fs_type,
1091 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1092 {
1093 struct nfs_clone_mount *data = raw_data;
1094 return nfs_clone_generic_sb(data, nfs_clone_sb, nfs_clone_server, mnt);
1095 }
1096
1097 #ifdef CONFIG_NFS_V4
1098 static struct rpc_clnt *nfs4_create_client(struct nfs_server *server,
1099 struct rpc_timeout *timeparms, int proto, rpc_authflavor_t flavor)
1100 {
1101 struct nfs_client *clp;
1102 struct rpc_xprt *xprt = NULL;
1103 struct rpc_clnt *clnt = NULL;
1104 int err = -EIO;
1105
1106 clp = nfs_get_client(server->hostname, &server->addr, 4);
1107 if (!clp) {
1108 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1109 return ERR_PTR(err);
1110 }
1111
1112 /* Now create transport and client */
1113 if (clp->cl_cons_state == NFS_CS_INITING) {
1114 xprt = xprt_create_proto(proto, &server->addr, timeparms);
1115 if (IS_ERR(xprt)) {
1116 err = PTR_ERR(xprt);
1117 dprintk("%s: cannot create RPC transport. Error = %d\n",
1118 __FUNCTION__, err);
1119 goto client_init_error;
1120 }
1121 /* Bind to a reserved port! */
1122 xprt->resvport = 1;
1123 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1124 server->rpc_ops->version, flavor);
1125 if (IS_ERR(clnt)) {
1126 err = PTR_ERR(clnt);
1127 dprintk("%s: cannot create RPC client. Error = %d\n",
1128 __FUNCTION__, err);
1129 goto client_init_error;
1130 }
1131 clnt->cl_intr = 1;
1132 clnt->cl_softrtry = 1;
1133 clp->cl_rpcclient = clnt;
1134 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1135 err = nfs_idmap_new(clp);
1136 if (err < 0) {
1137 dprintk("%s: failed to create idmapper.\n",
1138 __FUNCTION__);
1139 goto client_init_error;
1140 }
1141 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
1142 nfs_mark_client_ready(clp, 0);
1143 }
1144
1145 clnt = rpc_clone_client(clp->cl_rpcclient);
1146
1147 if (IS_ERR(clnt)) {
1148 dprintk("%s: cannot create RPC client. Error = %d\n",
1149 __FUNCTION__, err);
1150 return clnt;
1151 }
1152
1153 if (clnt->cl_auth->au_flavor != flavor) {
1154 struct rpc_auth *auth;
1155
1156 auth = rpcauth_create(flavor, clnt);
1157 if (IS_ERR(auth)) {
1158 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1159 return (struct rpc_clnt *)auth;
1160 }
1161 }
1162
1163 server->nfs_client = clp;
1164 down_write(&clp->cl_sem);
1165 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1166 up_write(&clp->cl_sem);
1167 return clnt;
1168
1169 client_init_error:
1170 nfs_mark_client_ready(clp, err);
1171 nfs_put_client(clp);
1172 return ERR_PTR(err);
1173 }
1174
1175 /*
1176 * Set up an NFS4 superblock
1177 */
1178 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1179 {
1180 struct nfs_server *server;
1181 struct rpc_timeout timeparms;
1182 rpc_authflavor_t authflavour;
1183 int err = -EIO;
1184
1185 sb->s_blocksize_bits = 0;
1186 sb->s_blocksize = 0;
1187 server = NFS_SB(sb);
1188 if (data->rsize != 0)
1189 server->rsize = nfs_block_size(data->rsize, NULL);
1190 if (data->wsize != 0)
1191 server->wsize = nfs_block_size(data->wsize, NULL);
1192 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1193 server->caps = NFS_CAP_ATOMIC_OPEN;
1194
1195 server->acregmin = data->acregmin*HZ;
1196 server->acregmax = data->acregmax*HZ;
1197 server->acdirmin = data->acdirmin*HZ;
1198 server->acdirmax = data->acdirmax*HZ;
1199
1200 server->rpc_ops = &nfs_v4_clientops;
1201
1202 nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1203
1204 server->retrans_timeo = timeparms.to_initval;
1205 server->retrans_count = timeparms.to_retries;
1206
1207 /* Now create transport and client */
1208 authflavour = RPC_AUTH_UNIX;
1209 if (data->auth_flavourlen != 0) {
1210 if (data->auth_flavourlen != 1) {
1211 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1212 __FUNCTION__, data->auth_flavourlen);
1213 err = -EINVAL;
1214 goto out_fail;
1215 }
1216 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1217 err = -EFAULT;
1218 goto out_fail;
1219 }
1220 }
1221
1222 server->client = nfs4_create_client(server, &timeparms, data->proto, authflavour);
1223 if (IS_ERR(server->client)) {
1224 err = PTR_ERR(server->client);
1225 dprintk("%s: cannot create RPC client. Error = %d\n",
1226 __FUNCTION__, err);
1227 goto out_fail;
1228 }
1229
1230 sb->s_time_gran = 1;
1231
1232 sb->s_op = &nfs4_sops;
1233 err = nfs_sb_init(sb, authflavour);
1234
1235 out_fail:
1236 return err;
1237 }
1238
1239 static int nfs4_compare_super(struct super_block *sb, void *data)
1240 {
1241 struct nfs_server *server = data;
1242 struct nfs_server *old = NFS_SB(sb);
1243
1244 if (strcmp(server->hostname, old->hostname) != 0)
1245 return 0;
1246 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1247 return 0;
1248 return 1;
1249 }
1250
1251 static void *
1252 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1253 {
1254 void *p = NULL;
1255
1256 if (!src->len)
1257 return ERR_PTR(-EINVAL);
1258 if (src->len < maxlen)
1259 maxlen = src->len;
1260 if (dst == NULL) {
1261 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1262 if (p == NULL)
1263 return ERR_PTR(-ENOMEM);
1264 }
1265 if (copy_from_user(dst, src->data, maxlen)) {
1266 kfree(p);
1267 return ERR_PTR(-EFAULT);
1268 }
1269 dst[maxlen] = '\0';
1270 return dst;
1271 }
1272
1273 static int nfs4_get_sb(struct file_system_type *fs_type,
1274 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1275 {
1276 int error;
1277 struct nfs_server *server;
1278 struct super_block *s;
1279 struct nfs4_mount_data *data = raw_data;
1280 void *p;
1281
1282 if (data == NULL) {
1283 dprintk("%s: missing data argument\n", __FUNCTION__);
1284 return -EINVAL;
1285 }
1286 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1287 dprintk("%s: bad mount version\n", __FUNCTION__);
1288 return -EINVAL;
1289 }
1290
1291 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1292 if (!server)
1293 return -ENOMEM;
1294 /* Zero out the NFS state stuff */
1295 init_nfsv4_state(server);
1296 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1297
1298 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1299 if (IS_ERR(p))
1300 goto out_err;
1301 server->hostname = p;
1302
1303 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1304 if (IS_ERR(p))
1305 goto out_err;
1306 server->mnt_path = p;
1307
1308 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1309 sizeof(server->ip_addr) - 1);
1310 if (IS_ERR(p))
1311 goto out_err;
1312
1313 /* We now require that the mount process passes the remote address */
1314 if (data->host_addrlen != sizeof(server->addr)) {
1315 error = -EINVAL;
1316 goto out_free;
1317 }
1318 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1319 error = -EFAULT;
1320 goto out_free;
1321 }
1322 if (server->addr.sin_family != AF_INET ||
1323 server->addr.sin_addr.s_addr == INADDR_ANY) {
1324 dprintk("%s: mount program didn't pass remote IP address!\n",
1325 __FUNCTION__);
1326 error = -EINVAL;
1327 goto out_free;
1328 }
1329
1330 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1331 if (IS_ERR(s)) {
1332 error = PTR_ERR(s);
1333 goto out_free;
1334 }
1335
1336 if (s->s_root) {
1337 kfree(server->mnt_path);
1338 kfree(server->hostname);
1339 kfree(server);
1340 return simple_set_mnt(mnt, s);
1341 }
1342
1343 s->s_flags = flags;
1344
1345 error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1346 if (error) {
1347 up_write(&s->s_umount);
1348 deactivate_super(s);
1349 return error;
1350 }
1351 s->s_flags |= MS_ACTIVE;
1352 return simple_set_mnt(mnt, s);
1353 out_err:
1354 error = PTR_ERR(p);
1355 out_free:
1356 kfree(server->mnt_path);
1357 kfree(server->hostname);
1358 kfree(server);
1359 return error;
1360 }
1361
1362 static void nfs4_kill_super(struct super_block *sb)
1363 {
1364 struct nfs_server *server = NFS_SB(sb);
1365
1366 nfs_return_all_delegations(sb);
1367 kill_anon_super(sb);
1368
1369 nfs4_renewd_prepare_shutdown(server);
1370
1371 if (server->client != NULL && !IS_ERR(server->client))
1372 rpc_shutdown_client(server->client);
1373
1374 destroy_nfsv4_state(server);
1375
1376 nfs_free_iostats(server->io_stats);
1377 kfree(server->hostname);
1378 kfree(server);
1379 nfs_release_automount_timer();
1380 }
1381
1382 /*
1383 * Constructs the SERVER-side path
1384 */
1385 static inline char *nfs4_dup_path(const struct dentry *dentry)
1386 {
1387 char *page = (char *) __get_free_page(GFP_USER);
1388 char *path;
1389
1390 path = nfs4_path(dentry, page, PAGE_SIZE);
1391 if (!IS_ERR(path)) {
1392 int len = PAGE_SIZE + page - path;
1393 char *tmp = path;
1394
1395 path = kmalloc(len, GFP_KERNEL);
1396 if (path)
1397 memcpy(path, tmp, len);
1398 else
1399 path = ERR_PTR(-ENOMEM);
1400 }
1401 free_page((unsigned long)page);
1402 return path;
1403 }
1404
1405 static struct super_block *nfs4_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1406 {
1407 const struct dentry *dentry = data->dentry;
1408 struct nfs_client *clp = server->nfs_client;
1409 struct super_block *sb;
1410
1411 server->fsid = data->fattr->fsid;
1412 nfs_copy_fh(&server->fh, data->fh);
1413 server->mnt_path = nfs4_dup_path(dentry);
1414 if (IS_ERR(server->mnt_path)) {
1415 sb = (struct super_block *)server->mnt_path;
1416 goto err;
1417 }
1418 sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server);
1419 if (IS_ERR(sb) || sb->s_root)
1420 goto free_path;
1421 nfs4_server_capabilities(server, &server->fh);
1422
1423 down_write(&clp->cl_sem);
1424 atomic_inc(&clp->cl_count);
1425 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1426 up_write(&clp->cl_sem);
1427 return sb;
1428 free_path:
1429 kfree(server->mnt_path);
1430 err:
1431 server->mnt_path = NULL;
1432 return sb;
1433 }
1434
1435 static int nfs_clone_nfs4_sb(struct file_system_type *fs_type,
1436 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1437 {
1438 struct nfs_clone_mount *data = raw_data;
1439 return nfs_clone_generic_sb(data, nfs4_clone_sb, nfs_clone_server, mnt);
1440 }
1441
1442 static struct super_block *nfs4_referral_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1443 {
1444 struct super_block *sb = ERR_PTR(-ENOMEM);
1445 int len;
1446
1447 len = strlen(data->mnt_path) + 1;
1448 server->mnt_path = kmalloc(len, GFP_KERNEL);
1449 if (server->mnt_path == NULL)
1450 goto err;
1451 memcpy(server->mnt_path, data->mnt_path, len);
1452 memcpy(&server->addr, data->addr, sizeof(struct sockaddr_in));
1453
1454 sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server);
1455 if (IS_ERR(sb) || sb->s_root)
1456 goto free_path;
1457 return sb;
1458 free_path:
1459 kfree(server->mnt_path);
1460 err:
1461 server->mnt_path = NULL;
1462 return sb;
1463 }
1464
1465 static struct nfs_server *nfs4_referral_server(struct super_block *sb, struct nfs_clone_mount *data)
1466 {
1467 struct nfs_server *server = NFS_SB(sb);
1468 struct rpc_timeout timeparms;
1469 int proto, timeo, retrans;
1470 void *err;
1471
1472 proto = IPPROTO_TCP;
1473 /* Since we are following a referral and there may be alternatives,
1474 set the timeouts and retries to low values */
1475 timeo = 2;
1476 retrans = 1;
1477 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
1478
1479 server->client = nfs4_create_client(server, &timeparms, proto, data->authflavor);
1480 if (IS_ERR((err = server->client)))
1481 goto out_err;
1482
1483 sb->s_time_gran = 1;
1484 sb->s_op = &nfs4_sops;
1485 err = ERR_PTR(nfs_sb_init(sb, data->authflavor));
1486 if (!IS_ERR(err))
1487 return server;
1488 out_err:
1489 return (struct nfs_server *)err;
1490 }
1491
1492 static int nfs_referral_nfs4_sb(struct file_system_type *fs_type,
1493 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1494 {
1495 struct nfs_clone_mount *data = raw_data;
1496 return nfs_clone_generic_sb(data, nfs4_referral_sb, nfs4_referral_server, mnt);
1497 }
1498
1499 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree