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-rw-r--r--fs/nfs/super.c1468
1 files changed, 1468 insertions, 0 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
new file mode 100644
index 000000000000..4acd3ee96427
--- /dev/null
+++ b/fs/nfs/super.c
@@ -0,0 +1,1468 @@
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 */
66static 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
80static 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
89struct rpc_stat nfs_rpcstat = {
90 .program = &nfs_program
91};
92
93
94#ifdef CONFIG_NFS_V3_ACL
95static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
96static struct rpc_version * nfsacl_version[] = {
97 [3] = &nfsacl_version3,
98};
99
100struct 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
109static void nfs_umount_begin(struct vfsmount *, int);
110static int nfs_statfs(struct super_block *, struct kstatfs *);
111static int nfs_show_options(struct seq_file *, struct vfsmount *);
112static int nfs_show_stats(struct seq_file *, struct vfsmount *);
113static struct super_block *nfs_get_sb(struct file_system_type *, int, const char *, void *);
114static struct super_block *nfs_clone_nfs_sb(struct file_system_type *fs_type,
115 int flags, const char *dev_name, void *raw_data);
116static void nfs_kill_super(struct super_block *);
117
118static 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
126struct 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
134static 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
146static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
147 int flags, const char *dev_name, void *raw_data);
148static struct super_block *nfs_clone_nfs4_sb(struct file_system_type *fs_type,
149 int flags, const char *dev_name, void *raw_data);
150static struct super_block *nfs_referral_nfs4_sb(struct file_system_type *fs_type,
151 int flags, const char *dev_name, void *raw_data);
152static void nfs4_kill_super(struct super_block *sb);
153
154static 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
162struct 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
170struct 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
178static 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
190static const int nfs_set_port_min = 0;
191static const int nfs_set_port_max = 65535;
192
193static int param_set_port(const char *val, struct kernel_param *kp)
194{
195 char *endp;
196 int num = simple_strtol(val, &endp, 0);
197 if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
198 return -EINVAL;
199 *((int *)kp->arg) = num;
200 return 0;
201}
202
203module_param_call(callback_tcpport, param_set_port, param_get_int,
204 &nfs_callback_set_tcpport, 0644);
205
206static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
207{
208 char *endp;
209 int num = simple_strtol(val, &endp, 0);
210 int jif = num * HZ;
211 if (endp == val || *endp || num < 0 || jif < num)
212 return -EINVAL;
213 *((int *)kp->arg) = jif;
214 return 0;
215}
216
217module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
218 &nfs_idmap_cache_timeout, 0644);
219
220/*
221 * Register the NFS filesystems
222 */
223int __init register_nfs_fs(void)
224{
225 int ret;
226
227 ret = register_filesystem(&nfs_fs_type);
228 if (ret < 0)
229 goto error_0;
230
231#ifdef CONFIG_NFS_V4
232 ret = nfs_register_sysctl();
233 if (ret < 0)
234 goto error_1;
235 ret = register_filesystem(&nfs4_fs_type);
236 if (ret < 0)
237 goto error_2;
238#endif
239 return 0;
240
241#ifdef CONFIG_NFS_V4
242error_2:
243 nfs_unregister_sysctl();
244error_1:
245 unregister_filesystem(&nfs_fs_type);
246#endif
247error_0:
248 return ret;
249}
250
251/*
252 * Unregister the NFS filesystems
253 */
254void __exit unregister_nfs_fs(void)
255{
256#ifdef CONFIG_NFS_V4
257 unregister_filesystem(&nfs4_fs_type);
258 nfs_unregister_sysctl();
259#endif
260 unregister_filesystem(&nfs_fs_type);
261}
262
263/*
264 * Deliver file system statistics to userspace
265 */
266static int nfs_statfs(struct super_block *sb, struct kstatfs *buf)
267{
268 struct nfs_server *server = NFS_SB(sb);
269 unsigned char blockbits;
270 unsigned long blockres;
271 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
272 struct nfs_fattr fattr;
273 struct nfs_fsstat res = {
274 .fattr = &fattr,
275 };
276 int error;
277
278 lock_kernel();
279
280 error = server->rpc_ops->statfs(server, rootfh, &res);
281 buf->f_type = NFS_SUPER_MAGIC;
282 if (error < 0)
283 goto out_err;
284
285 /*
286 * Current versions of glibc do not correctly handle the
287 * case where f_frsize != f_bsize. Eventually we want to
288 * report the value of wtmult in this field.
289 */
290 buf->f_frsize = sb->s_blocksize;
291
292 /*
293 * On most *nix systems, f_blocks, f_bfree, and f_bavail
294 * are reported in units of f_frsize. Linux hasn't had
295 * an f_frsize field in its statfs struct until recently,
296 * thus historically Linux's sys_statfs reports these
297 * fields in units of f_bsize.
298 */
299 buf->f_bsize = sb->s_blocksize;
300 blockbits = sb->s_blocksize_bits;
301 blockres = (1 << blockbits) - 1;
302 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
303 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
304 buf->f_bavail = (res.abytes + blockres) >> blockbits;
305
306 buf->f_files = res.tfiles;
307 buf->f_ffree = res.afiles;
308
309 buf->f_namelen = server->namelen;
310 out:
311 unlock_kernel();
312 return 0;
313
314 out_err:
315 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
316 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
317 goto out;
318
319}
320
321/*
322 * Describe the mount options in force on this server representation
323 */
324static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
325{
326 static struct proc_nfs_info {
327 int flag;
328 char *str;
329 char *nostr;
330 } nfs_info[] = {
331 { NFS_MOUNT_SOFT, ",soft", ",hard" },
332 { NFS_MOUNT_INTR, ",intr", "" },
333 { NFS_MOUNT_NOCTO, ",nocto", "" },
334 { NFS_MOUNT_NOAC, ",noac", "" },
335 { NFS_MOUNT_NONLM, ",nolock", "" },
336 { NFS_MOUNT_NOACL, ",noacl", "" },
337 { 0, NULL, NULL }
338 };
339 struct proc_nfs_info *nfs_infop;
340 char buf[12];
341 char *proto;
342
343 seq_printf(m, ",vers=%d", nfss->rpc_ops->version);
344 seq_printf(m, ",rsize=%d", nfss->rsize);
345 seq_printf(m, ",wsize=%d", nfss->wsize);
346 if (nfss->acregmin != 3*HZ || showdefaults)
347 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
348 if (nfss->acregmax != 60*HZ || showdefaults)
349 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
350 if (nfss->acdirmin != 30*HZ || showdefaults)
351 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
352 if (nfss->acdirmax != 60*HZ || showdefaults)
353 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
354 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
355 if (nfss->flags & nfs_infop->flag)
356 seq_puts(m, nfs_infop->str);
357 else
358 seq_puts(m, nfs_infop->nostr);
359 }
360 switch (nfss->client->cl_xprt->prot) {
361 case IPPROTO_TCP:
362 proto = "tcp";
363 break;
364 case IPPROTO_UDP:
365 proto = "udp";
366 break;
367 default:
368 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
369 proto = buf;
370 }
371 seq_printf(m, ",proto=%s", proto);
372 seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ);
373 seq_printf(m, ",retrans=%u", nfss->retrans_count);
374}
375
376/*
377 * Describe the mount options on this VFS mountpoint
378 */
379static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
380{
381 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
382
383 nfs_show_mount_options(m, nfss, 0);
384
385 seq_puts(m, ",addr=");
386 seq_escape(m, nfss->hostname, " \t\n\\");
387
388 return 0;
389}
390
391/*
392 * Present statistical information for this VFS mountpoint
393 */
394static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
395{
396 int i, cpu;
397 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
398 struct rpc_auth *auth = nfss->client->cl_auth;
399 struct nfs_iostats totals = { };
400
401 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
402
403 /*
404 * Display all mount option settings
405 */
406 seq_printf(m, "\n\topts:\t");
407 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
408 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
409 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
410 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
411 nfs_show_mount_options(m, nfss, 1);
412
413 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
414
415 seq_printf(m, "\n\tcaps:\t");
416 seq_printf(m, "caps=0x%x", nfss->caps);
417 seq_printf(m, ",wtmult=%d", nfss->wtmult);
418 seq_printf(m, ",dtsize=%d", nfss->dtsize);
419 seq_printf(m, ",bsize=%d", nfss->bsize);
420 seq_printf(m, ",namelen=%d", nfss->namelen);
421
422#ifdef CONFIG_NFS_V4
423 if (nfss->rpc_ops->version == 4) {
424 seq_printf(m, "\n\tnfsv4:\t");
425 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
426 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
427 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
428 }
429#endif
430
431 /*
432 * Display security flavor in effect for this mount
433 */
434 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
435 if (auth->au_flavor)
436 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
437
438 /*
439 * Display superblock I/O counters
440 */
441 for_each_possible_cpu(cpu) {
442 struct nfs_iostats *stats;
443
444 preempt_disable();
445 stats = per_cpu_ptr(nfss->io_stats, cpu);
446
447 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
448 totals.events[i] += stats->events[i];
449 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
450 totals.bytes[i] += stats->bytes[i];
451
452 preempt_enable();
453 }
454
455 seq_printf(m, "\n\tevents:\t");
456 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
457 seq_printf(m, "%lu ", totals.events[i]);
458 seq_printf(m, "\n\tbytes:\t");
459 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
460 seq_printf(m, "%Lu ", totals.bytes[i]);
461 seq_printf(m, "\n");
462
463 rpc_print_iostats(m, nfss->client);
464
465 return 0;
466}
467
468/*
469 * Begin unmount by attempting to remove all automounted mountpoints we added
470 * in response to traversals
471 */
472static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
473{
474 struct nfs_server *server;
475 struct rpc_clnt *rpc;
476
477 shrink_submounts(vfsmnt, &nfs_automount_list);
478 if (!(flags & MNT_FORCE))
479 return;
480 /* -EIO all pending I/O */
481 server = NFS_SB(vfsmnt->mnt_sb);
482 rpc = server->client;
483 if (!IS_ERR(rpc))
484 rpc_killall_tasks(rpc);
485 rpc = server->client_acl;
486 if (!IS_ERR(rpc))
487 rpc_killall_tasks(rpc);
488}
489
490/*
491 * Obtain the root inode of the file system.
492 */
493static struct inode *
494nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
495{
496 struct nfs_server *server = NFS_SB(sb);
497 int error;
498
499 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
500 if (error < 0) {
501 dprintk("nfs_get_root: getattr error = %d\n", -error);
502 return ERR_PTR(error);
503 }
504
505 server->fsid = fsinfo->fattr->fsid;
506 return nfs_fhget(sb, rootfh, fsinfo->fattr);
507}
508
509/*
510 * Do NFS version-independent mount processing, and sanity checking
511 */
512static int
513nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
514{
515 struct nfs_server *server;
516 struct inode *root_inode;
517 struct nfs_fattr fattr;
518 struct nfs_fsinfo fsinfo = {
519 .fattr = &fattr,
520 };
521 struct nfs_pathconf pathinfo = {
522 .fattr = &fattr,
523 };
524 int no_root_error = 0;
525 unsigned long max_rpc_payload;
526
527 /* We probably want something more informative here */
528 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
529
530 server = NFS_SB(sb);
531
532 sb->s_magic = NFS_SUPER_MAGIC;
533
534 server->io_stats = nfs_alloc_iostats();
535 if (server->io_stats == NULL)
536 return -ENOMEM;
537
538 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
539 /* Did getting the root inode fail? */
540 if (IS_ERR(root_inode)) {
541 no_root_error = PTR_ERR(root_inode);
542 goto out_no_root;
543 }
544 sb->s_root = d_alloc_root(root_inode);
545 if (!sb->s_root) {
546 no_root_error = -ENOMEM;
547 goto out_no_root;
548 }
549 sb->s_root->d_op = server->rpc_ops->dentry_ops;
550
551 /* mount time stamp, in seconds */
552 server->mount_time = jiffies;
553
554 /* Get some general file system info */
555 if (server->namelen == 0 &&
556 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
557 server->namelen = pathinfo.max_namelen;
558 /* Work out a lot of parameters */
559 if (server->rsize == 0)
560 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
561 if (server->wsize == 0)
562 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
563
564 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
565 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
566 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
567 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
568
569 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
570 if (server->rsize > max_rpc_payload)
571 server->rsize = max_rpc_payload;
572 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
573 server->rsize = NFS_MAX_FILE_IO_SIZE;
574 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
575
576 if (server->wsize > max_rpc_payload)
577 server->wsize = max_rpc_payload;
578 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
579 server->wsize = NFS_MAX_FILE_IO_SIZE;
580 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
581
582 if (sb->s_blocksize == 0)
583 sb->s_blocksize = nfs_block_bits(server->wsize,
584 &sb->s_blocksize_bits);
585 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
586
587 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
588 if (server->dtsize > PAGE_CACHE_SIZE)
589 server->dtsize = PAGE_CACHE_SIZE;
590 if (server->dtsize > server->rsize)
591 server->dtsize = server->rsize;
592
593 if (server->flags & NFS_MOUNT_NOAC) {
594 server->acregmin = server->acregmax = 0;
595 server->acdirmin = server->acdirmax = 0;
596 sb->s_flags |= MS_SYNCHRONOUS;
597 }
598 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
599
600 nfs_super_set_maxbytes(sb, fsinfo.maxfilesize);
601
602 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
603 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
604
605 /* We're airborne Set socket buffersize */
606 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
607 return 0;
608 /* Yargs. It didn't work out. */
609out_no_root:
610 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
611 if (!IS_ERR(root_inode))
612 iput(root_inode);
613 return no_root_error;
614}
615
616/*
617 * Initialise the timeout values for a connection
618 */
619static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
620{
621 to->to_initval = timeo * HZ / 10;
622 to->to_retries = retrans;
623 if (!to->to_retries)
624 to->to_retries = 2;
625
626 switch (proto) {
627 case IPPROTO_TCP:
628 if (!to->to_initval)
629 to->to_initval = 60 * HZ;
630 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
631 to->to_initval = NFS_MAX_TCP_TIMEOUT;
632 to->to_increment = to->to_initval;
633 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
634 to->to_exponential = 0;
635 break;
636 case IPPROTO_UDP:
637 default:
638 if (!to->to_initval)
639 to->to_initval = 11 * HZ / 10;
640 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
641 to->to_initval = NFS_MAX_UDP_TIMEOUT;
642 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
643 to->to_exponential = 1;
644 break;
645 }
646}
647
648/*
649 * Create an RPC client handle.
650 */
651static struct rpc_clnt *
652nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
653{
654 struct rpc_timeout timeparms;
655 struct rpc_xprt *xprt = NULL;
656 struct rpc_clnt *clnt = NULL;
657 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
658
659 nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
660
661 server->retrans_timeo = timeparms.to_initval;
662 server->retrans_count = timeparms.to_retries;
663
664 /* create transport and client */
665 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
666 if (IS_ERR(xprt)) {
667 dprintk("%s: cannot create RPC transport. Error = %ld\n",
668 __FUNCTION__, PTR_ERR(xprt));
669 return (struct rpc_clnt *)xprt;
670 }
671 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
672 server->rpc_ops->version, data->pseudoflavor);
673 if (IS_ERR(clnt)) {
674 dprintk("%s: cannot create RPC client. Error = %ld\n",
675 __FUNCTION__, PTR_ERR(xprt));
676 goto out_fail;
677 }
678
679 clnt->cl_intr = 1;
680 clnt->cl_softrtry = 1;
681
682 return clnt;
683
684out_fail:
685 return clnt;
686}
687
688/*
689 * Clone a server record
690 */
691static struct nfs_server *nfs_clone_server(struct super_block *sb, struct nfs_clone_mount *data)
692{
693 struct nfs_server *server = NFS_SB(sb);
694 struct nfs_server *parent = NFS_SB(data->sb);
695 struct inode *root_inode;
696 struct nfs_fsinfo fsinfo;
697 void *err = ERR_PTR(-ENOMEM);
698
699 sb->s_op = data->sb->s_op;
700 sb->s_blocksize = data->sb->s_blocksize;
701 sb->s_blocksize_bits = data->sb->s_blocksize_bits;
702 sb->s_maxbytes = data->sb->s_maxbytes;
703
704 server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
705 server->io_stats = nfs_alloc_iostats();
706 if (server->io_stats == NULL)
707 goto out;
708
709 server->client = rpc_clone_client(parent->client);
710 if (IS_ERR((err = server->client)))
711 goto out;
712
713 if (!IS_ERR(parent->client_sys)) {
714 server->client_sys = rpc_clone_client(parent->client_sys);
715 if (IS_ERR((err = server->client_sys)))
716 goto out;
717 }
718 if (!IS_ERR(parent->client_acl)) {
719 server->client_acl = rpc_clone_client(parent->client_acl);
720 if (IS_ERR((err = server->client_acl)))
721 goto out;
722 }
723 root_inode = nfs_fhget(sb, data->fh, data->fattr);
724 if (!root_inode)
725 goto out;
726 sb->s_root = d_alloc_root(root_inode);
727 if (!sb->s_root)
728 goto out_put_root;
729 fsinfo.fattr = data->fattr;
730 if (NFS_PROTO(root_inode)->fsinfo(server, data->fh, &fsinfo) == 0)
731 nfs_super_set_maxbytes(sb, fsinfo.maxfilesize);
732 sb->s_root->d_op = server->rpc_ops->dentry_ops;
733 sb->s_flags |= MS_ACTIVE;
734 return server;
735out_put_root:
736 iput(root_inode);
737out:
738 return err;
739}
740
741/*
742 * Copy an existing superblock and attach revised data
743 */
744static struct super_block *nfs_clone_generic_sb(struct nfs_clone_mount *data,
745 struct super_block *(*fill_sb)(struct nfs_server *, struct nfs_clone_mount *),
746 struct nfs_server *(*fill_server)(struct super_block *, struct nfs_clone_mount *))
747{
748 struct nfs_server *server;
749 struct nfs_server *parent = NFS_SB(data->sb);
750 struct super_block *sb = ERR_PTR(-EINVAL);
751 void *err = ERR_PTR(-ENOMEM);
752 char *hostname;
753 int len;
754
755 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
756 if (server == NULL)
757 goto out_err;
758 memcpy(server, parent, sizeof(*server));
759 hostname = (data->hostname != NULL) ? data->hostname : parent->hostname;
760 len = strlen(hostname) + 1;
761 server->hostname = kmalloc(len, GFP_KERNEL);
762 if (server->hostname == NULL)
763 goto free_server;
764 memcpy(server->hostname, hostname, len);
765 if (rpciod_up() != 0)
766 goto free_hostname;
767
768 sb = fill_sb(server, data);
769 if (IS_ERR((err = sb)) || sb->s_root)
770 goto kill_rpciod;
771
772 server = fill_server(sb, data);
773 if (IS_ERR((err = server)))
774 goto out_deactivate;
775 return sb;
776out_deactivate:
777 up_write(&sb->s_umount);
778 deactivate_super(sb);
779 return (struct super_block *)err;
780kill_rpciod:
781 rpciod_down();
782free_hostname:
783 kfree(server->hostname);
784free_server:
785 kfree(server);
786out_err:
787 return (struct super_block *)err;
788}
789
790/*
791 * Set up an NFS2/3 superblock
792 *
793 * The way this works is that the mount process passes a structure
794 * in the data argument which contains the server's IP address
795 * and the root file handle obtained from the server's mount
796 * daemon. We stash these away in the private superblock fields.
797 */
798static int
799nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
800{
801 struct nfs_server *server;
802 rpc_authflavor_t authflavor;
803
804 server = NFS_SB(sb);
805 sb->s_blocksize_bits = 0;
806 sb->s_blocksize = 0;
807 if (data->bsize)
808 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
809 if (data->rsize)
810 server->rsize = nfs_block_size(data->rsize, NULL);
811 if (data->wsize)
812 server->wsize = nfs_block_size(data->wsize, NULL);
813 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
814
815 server->acregmin = data->acregmin*HZ;
816 server->acregmax = data->acregmax*HZ;
817 server->acdirmin = data->acdirmin*HZ;
818 server->acdirmax = data->acdirmax*HZ;
819
820 /* Start lockd here, before we might error out */
821 if (!(server->flags & NFS_MOUNT_NONLM))
822 lockd_up();
823
824 server->namelen = data->namlen;
825 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
826 if (!server->hostname)
827 return -ENOMEM;
828 strcpy(server->hostname, data->hostname);
829
830 /* Check NFS protocol revision and initialize RPC op vector
831 * and file handle pool. */
832#ifdef CONFIG_NFS_V3
833 if (server->flags & NFS_MOUNT_VER3) {
834 server->rpc_ops = &nfs_v3_clientops;
835 server->caps |= NFS_CAP_READDIRPLUS;
836 } else {
837 server->rpc_ops = &nfs_v2_clientops;
838 }
839#else
840 server->rpc_ops = &nfs_v2_clientops;
841#endif
842
843 /* Fill in pseudoflavor for mount version < 5 */
844 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
845 data->pseudoflavor = RPC_AUTH_UNIX;
846 authflavor = data->pseudoflavor; /* save for sb_init() */
847 /* XXX maybe we want to add a server->pseudoflavor field */
848
849 /* Create RPC client handles */
850 server->client = nfs_create_client(server, data);
851 if (IS_ERR(server->client))
852 return PTR_ERR(server->client);
853 /* RFC 2623, sec 2.3.2 */
854 if (authflavor != RPC_AUTH_UNIX) {
855 struct rpc_auth *auth;
856
857 server->client_sys = rpc_clone_client(server->client);
858 if (IS_ERR(server->client_sys))
859 return PTR_ERR(server->client_sys);
860 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
861 if (IS_ERR(auth))
862 return PTR_ERR(auth);
863 } else {
864 atomic_inc(&server->client->cl_count);
865 server->client_sys = server->client;
866 }
867 if (server->flags & NFS_MOUNT_VER3) {
868#ifdef CONFIG_NFS_V3_ACL
869 if (!(server->flags & NFS_MOUNT_NOACL)) {
870 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
871 /* No errors! Assume that Sun nfsacls are supported */
872 if (!IS_ERR(server->client_acl))
873 server->caps |= NFS_CAP_ACLS;
874 }
875#else
876 server->flags &= ~NFS_MOUNT_NOACL;
877#endif /* CONFIG_NFS_V3_ACL */
878 /*
879 * The VFS shouldn't apply the umask to mode bits. We will
880 * do so ourselves when necessary.
881 */
882 sb->s_flags |= MS_POSIXACL;
883 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
884 server->namelen = NFS3_MAXNAMLEN;
885 sb->s_time_gran = 1;
886 } else {
887 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
888 server->namelen = NFS2_MAXNAMLEN;
889 }
890
891 sb->s_op = &nfs_sops;
892 return nfs_sb_init(sb, authflavor);
893}
894
895static int nfs_set_super(struct super_block *s, void *data)
896{
897 s->s_fs_info = data;
898 return set_anon_super(s, data);
899}
900
901static int nfs_compare_super(struct super_block *sb, void *data)
902{
903 struct nfs_server *server = data;
904 struct nfs_server *old = NFS_SB(sb);
905
906 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
907 return 0;
908 if (old->addr.sin_port != server->addr.sin_port)
909 return 0;
910 return !nfs_compare_fh(&old->fh, &server->fh);
911}
912
913static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
914 int flags, const char *dev_name, void *raw_data)
915{
916 int error;
917 struct nfs_server *server = NULL;
918 struct super_block *s;
919 struct nfs_fh *root;
920 struct nfs_mount_data *data = raw_data;
921
922 s = ERR_PTR(-EINVAL);
923 if (data == NULL) {
924 dprintk("%s: missing data argument\n", __FUNCTION__);
925 goto out_err;
926 }
927 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
928 dprintk("%s: bad mount version\n", __FUNCTION__);
929 goto out_err;
930 }
931 switch (data->version) {
932 case 1:
933 data->namlen = 0;
934 case 2:
935 data->bsize = 0;
936 case 3:
937 if (data->flags & NFS_MOUNT_VER3) {
938 dprintk("%s: mount structure version %d does not support NFSv3\n",
939 __FUNCTION__,
940 data->version);
941 goto out_err;
942 }
943 data->root.size = NFS2_FHSIZE;
944 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
945 case 4:
946 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
947 dprintk("%s: mount structure version %d does not support strong security\n",
948 __FUNCTION__,
949 data->version);
950 goto out_err;
951 }
952 case 5:
953 memset(data->context, 0, sizeof(data->context));
954 }
955#ifndef CONFIG_NFS_V3
956 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
957 s = ERR_PTR(-EPROTONOSUPPORT);
958 if (data->flags & NFS_MOUNT_VER3) {
959 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
960 goto out_err;
961 }
962#endif /* CONFIG_NFS_V3 */
963
964 s = ERR_PTR(-ENOMEM);
965 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
966 if (!server)
967 goto out_err;
968 /* Zero out the NFS state stuff */
969 init_nfsv4_state(server);
970 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
971
972 root = &server->fh;
973 if (data->flags & NFS_MOUNT_VER3)
974 root->size = data->root.size;
975 else
976 root->size = NFS2_FHSIZE;
977 s = ERR_PTR(-EINVAL);
978 if (root->size > sizeof(root->data)) {
979 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
980 goto out_err;
981 }
982 memcpy(root->data, data->root.data, root->size);
983
984 /* We now require that the mount process passes the remote address */
985 memcpy(&server->addr, &data->addr, sizeof(server->addr));
986 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
987 dprintk("%s: mount program didn't pass remote address!\n",
988 __FUNCTION__);
989 goto out_err;
990 }
991
992 /* Fire up rpciod if not yet running */
993 s = ERR_PTR(rpciod_up());
994 if (IS_ERR(s)) {
995 dprintk("%s: couldn't start rpciod! Error = %ld\n",
996 __FUNCTION__, PTR_ERR(s));
997 goto out_err;
998 }
999
1000 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1001 if (IS_ERR(s) || s->s_root)
1002 goto out_rpciod_down;
1003
1004 s->s_flags = flags;
1005
1006 error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1007 if (error) {
1008 up_write(&s->s_umount);
1009 deactivate_super(s);
1010 return ERR_PTR(error);
1011 }
1012 s->s_flags |= MS_ACTIVE;
1013 return s;
1014out_rpciod_down:
1015 rpciod_down();
1016out_err:
1017 kfree(server);
1018 return s;
1019}
1020
1021static void nfs_kill_super(struct super_block *s)
1022{
1023 struct nfs_server *server = NFS_SB(s);
1024
1025 kill_anon_super(s);
1026
1027 if (!IS_ERR(server->client))
1028 rpc_shutdown_client(server->client);
1029 if (!IS_ERR(server->client_sys))
1030 rpc_shutdown_client(server->client_sys);
1031 if (!IS_ERR(server->client_acl))
1032 rpc_shutdown_client(server->client_acl);
1033
1034 if (!(server->flags & NFS_MOUNT_NONLM))
1035 lockd_down(); /* release rpc.lockd */
1036
1037 rpciod_down(); /* release rpciod */
1038
1039 nfs_free_iostats(server->io_stats);
1040 kfree(server->hostname);
1041 kfree(server);
1042 nfs_release_automount_timer();
1043}
1044
1045static struct super_block *nfs_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1046{
1047 struct super_block *sb;
1048
1049 server->fsid = data->fattr->fsid;
1050 nfs_copy_fh(&server->fh, data->fh);
1051 sb = sget(&nfs_fs_type, nfs_compare_super, nfs_set_super, server);
1052 if (!IS_ERR(sb) && sb->s_root == NULL && !(server->flags & NFS_MOUNT_NONLM))
1053 lockd_up();
1054 return sb;
1055}
1056
1057static struct super_block *nfs_clone_nfs_sb(struct file_system_type *fs_type,
1058 int flags, const char *dev_name, void *raw_data)
1059{
1060 struct nfs_clone_mount *data = raw_data;
1061 return nfs_clone_generic_sb(data, nfs_clone_sb, nfs_clone_server);
1062}
1063
1064#ifdef CONFIG_NFS_V4
1065static struct rpc_clnt *nfs4_create_client(struct nfs_server *server,
1066 struct rpc_timeout *timeparms, int proto, rpc_authflavor_t flavor)
1067{
1068 struct nfs4_client *clp;
1069 struct rpc_xprt *xprt = NULL;
1070 struct rpc_clnt *clnt = NULL;
1071 int err = -EIO;
1072
1073 clp = nfs4_get_client(&server->addr.sin_addr);
1074 if (!clp) {
1075 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1076 return ERR_PTR(err);
1077 }
1078
1079 /* Now create transport and client */
1080 down_write(&clp->cl_sem);
1081 if (IS_ERR(clp->cl_rpcclient)) {
1082 xprt = xprt_create_proto(proto, &server->addr, timeparms);
1083 if (IS_ERR(xprt)) {
1084 up_write(&clp->cl_sem);
1085 err = PTR_ERR(xprt);
1086 dprintk("%s: cannot create RPC transport. Error = %d\n",
1087 __FUNCTION__, err);
1088 goto out_fail;
1089 }
1090 /* Bind to a reserved port! */
1091 xprt->resvport = 1;
1092 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1093 server->rpc_ops->version, flavor);
1094 if (IS_ERR(clnt)) {
1095 up_write(&clp->cl_sem);
1096 err = PTR_ERR(clnt);
1097 dprintk("%s: cannot create RPC client. Error = %d\n",
1098 __FUNCTION__, err);
1099 goto out_fail;
1100 }
1101 clnt->cl_intr = 1;
1102 clnt->cl_softrtry = 1;
1103 clp->cl_rpcclient = clnt;
1104 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1105 nfs_idmap_new(clp);
1106 }
1107 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1108 clnt = rpc_clone_client(clp->cl_rpcclient);
1109 if (!IS_ERR(clnt))
1110 server->nfs4_state = clp;
1111 up_write(&clp->cl_sem);
1112 clp = NULL;
1113
1114 if (IS_ERR(clnt)) {
1115 dprintk("%s: cannot create RPC client. Error = %d\n",
1116 __FUNCTION__, err);
1117 return clnt;
1118 }
1119
1120 if (server->nfs4_state->cl_idmap == NULL) {
1121 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1122 return ERR_PTR(-ENOMEM);
1123 }
1124
1125 if (clnt->cl_auth->au_flavor != flavor) {
1126 struct rpc_auth *auth;
1127
1128 auth = rpcauth_create(flavor, clnt);
1129 if (IS_ERR(auth)) {
1130 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1131 return (struct rpc_clnt *)auth;
1132 }
1133 }
1134 return clnt;
1135
1136 out_fail:
1137 if (clp)
1138 nfs4_put_client(clp);
1139 return ERR_PTR(err);
1140}
1141
1142/*
1143 * Set up an NFS4 superblock
1144 */
1145static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1146{
1147 struct nfs_server *server;
1148 struct rpc_timeout timeparms;
1149 rpc_authflavor_t authflavour;
1150 int err = -EIO;
1151
1152 sb->s_blocksize_bits = 0;
1153 sb->s_blocksize = 0;
1154 server = NFS_SB(sb);
1155 if (data->rsize != 0)
1156 server->rsize = nfs_block_size(data->rsize, NULL);
1157 if (data->wsize != 0)
1158 server->wsize = nfs_block_size(data->wsize, NULL);
1159 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1160 server->caps = NFS_CAP_ATOMIC_OPEN;
1161
1162 server->acregmin = data->acregmin*HZ;
1163 server->acregmax = data->acregmax*HZ;
1164 server->acdirmin = data->acdirmin*HZ;
1165 server->acdirmax = data->acdirmax*HZ;
1166
1167 server->rpc_ops = &nfs_v4_clientops;
1168
1169 nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1170
1171 server->retrans_timeo = timeparms.to_initval;
1172 server->retrans_count = timeparms.to_retries;
1173
1174 /* Now create transport and client */
1175 authflavour = RPC_AUTH_UNIX;
1176 if (data->auth_flavourlen != 0) {
1177 if (data->auth_flavourlen != 1) {
1178 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1179 __FUNCTION__, data->auth_flavourlen);
1180 err = -EINVAL;
1181 goto out_fail;
1182 }
1183 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1184 err = -EFAULT;
1185 goto out_fail;
1186 }
1187 }
1188
1189 server->client = nfs4_create_client(server, &timeparms, data->proto, authflavour);
1190 if (IS_ERR(server->client)) {
1191 err = PTR_ERR(server->client);
1192 dprintk("%s: cannot create RPC client. Error = %d\n",
1193 __FUNCTION__, err);
1194 goto out_fail;
1195 }
1196
1197 sb->s_time_gran = 1;
1198
1199 sb->s_op = &nfs4_sops;
1200 err = nfs_sb_init(sb, authflavour);
1201
1202 out_fail:
1203 return err;
1204}
1205
1206static int nfs4_compare_super(struct super_block *sb, void *data)
1207{
1208 struct nfs_server *server = data;
1209 struct nfs_server *old = NFS_SB(sb);
1210
1211 if (strcmp(server->hostname, old->hostname) != 0)
1212 return 0;
1213 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1214 return 0;
1215 return 1;
1216}
1217
1218static void *
1219nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1220{
1221 void *p = NULL;
1222
1223 if (!src->len)
1224 return ERR_PTR(-EINVAL);
1225 if (src->len < maxlen)
1226 maxlen = src->len;
1227 if (dst == NULL) {
1228 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1229 if (p == NULL)
1230 return ERR_PTR(-ENOMEM);
1231 }
1232 if (copy_from_user(dst, src->data, maxlen)) {
1233 kfree(p);
1234 return ERR_PTR(-EFAULT);
1235 }
1236 dst[maxlen] = '\0';
1237 return dst;
1238}
1239
1240static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1241 int flags, const char *dev_name, void *raw_data)
1242{
1243 int error;
1244 struct nfs_server *server;
1245 struct super_block *s;
1246 struct nfs4_mount_data *data = raw_data;
1247 void *p;
1248
1249 if (data == NULL) {
1250 dprintk("%s: missing data argument\n", __FUNCTION__);
1251 return ERR_PTR(-EINVAL);
1252 }
1253 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1254 dprintk("%s: bad mount version\n", __FUNCTION__);
1255 return ERR_PTR(-EINVAL);
1256 }
1257
1258 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1259 if (!server)
1260 return ERR_PTR(-ENOMEM);
1261 /* Zero out the NFS state stuff */
1262 init_nfsv4_state(server);
1263 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1264
1265 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1266 if (IS_ERR(p))
1267 goto out_err;
1268 server->hostname = p;
1269
1270 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1271 if (IS_ERR(p))
1272 goto out_err;
1273 server->mnt_path = p;
1274
1275 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1276 sizeof(server->ip_addr) - 1);
1277 if (IS_ERR(p))
1278 goto out_err;
1279
1280 /* We now require that the mount process passes the remote address */
1281 if (data->host_addrlen != sizeof(server->addr)) {
1282 s = ERR_PTR(-EINVAL);
1283 goto out_free;
1284 }
1285 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1286 s = ERR_PTR(-EFAULT);
1287 goto out_free;
1288 }
1289 if (server->addr.sin_family != AF_INET ||
1290 server->addr.sin_addr.s_addr == INADDR_ANY) {
1291 dprintk("%s: mount program didn't pass remote IP address!\n",
1292 __FUNCTION__);
1293 s = ERR_PTR(-EINVAL);
1294 goto out_free;
1295 }
1296
1297 /* Fire up rpciod if not yet running */
1298 s = ERR_PTR(rpciod_up());
1299 if (IS_ERR(s)) {
1300 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1301 __FUNCTION__, PTR_ERR(s));
1302 goto out_free;
1303 }
1304
1305 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1306
1307 if (IS_ERR(s) || s->s_root)
1308 goto out_free;
1309
1310 s->s_flags = flags;
1311
1312 error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1313 if (error) {
1314 up_write(&s->s_umount);
1315 deactivate_super(s);
1316 return ERR_PTR(error);
1317 }
1318 s->s_flags |= MS_ACTIVE;
1319 return s;
1320out_err:
1321 s = (struct super_block *)p;
1322out_free:
1323 kfree(server->mnt_path);
1324 kfree(server->hostname);
1325 kfree(server);
1326 return s;
1327}
1328
1329static void nfs4_kill_super(struct super_block *sb)
1330{
1331 struct nfs_server *server = NFS_SB(sb);
1332
1333 nfs_return_all_delegations(sb);
1334 kill_anon_super(sb);
1335
1336 nfs4_renewd_prepare_shutdown(server);
1337
1338 if (server->client != NULL && !IS_ERR(server->client))
1339 rpc_shutdown_client(server->client);
1340
1341 destroy_nfsv4_state(server);
1342
1343 rpciod_down();
1344
1345 nfs_free_iostats(server->io_stats);
1346 kfree(server->hostname);
1347 kfree(server);
1348 nfs_release_automount_timer();
1349}
1350
1351/*
1352 * Constructs the SERVER-side path
1353 */
1354static inline char *nfs4_dup_path(const struct dentry *dentry)
1355{
1356 char *page = (char *) __get_free_page(GFP_USER);
1357 char *path;
1358
1359 path = nfs4_path(dentry, page, PAGE_SIZE);
1360 if (!IS_ERR(path)) {
1361 int len = PAGE_SIZE + page - path;
1362 char *tmp = path;
1363
1364 path = kmalloc(len, GFP_KERNEL);
1365 if (path)
1366 memcpy(path, tmp, len);
1367 else
1368 path = ERR_PTR(-ENOMEM);
1369 }
1370 free_page((unsigned long)page);
1371 return path;
1372}
1373
1374static struct super_block *nfs4_clone_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1375{
1376 const struct dentry *dentry = data->dentry;
1377 struct nfs4_client *clp = server->nfs4_state;
1378 struct super_block *sb;
1379
1380 server->fsid = data->fattr->fsid;
1381 nfs_copy_fh(&server->fh, data->fh);
1382 server->mnt_path = nfs4_dup_path(dentry);
1383 if (IS_ERR(server->mnt_path)) {
1384 sb = (struct super_block *)server->mnt_path;
1385 goto err;
1386 }
1387 sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server);
1388 if (IS_ERR(sb) || sb->s_root)
1389 goto free_path;
1390 nfs4_server_capabilities(server, &server->fh);
1391
1392 down_write(&clp->cl_sem);
1393 atomic_inc(&clp->cl_count);
1394 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1395 up_write(&clp->cl_sem);
1396 return sb;
1397free_path:
1398 kfree(server->mnt_path);
1399err:
1400 server->mnt_path = NULL;
1401 return sb;
1402}
1403
1404static struct super_block *nfs_clone_nfs4_sb(struct file_system_type *fs_type,
1405 int flags, const char *dev_name, void *raw_data)
1406{
1407 struct nfs_clone_mount *data = raw_data;
1408 return nfs_clone_generic_sb(data, nfs4_clone_sb, nfs_clone_server);
1409}
1410
1411static struct super_block *nfs4_referral_sb(struct nfs_server *server, struct nfs_clone_mount *data)
1412{
1413 struct super_block *sb = ERR_PTR(-ENOMEM);
1414 int len;
1415
1416 len = strlen(data->mnt_path) + 1;
1417 server->mnt_path = kmalloc(len, GFP_KERNEL);
1418 if (server->mnt_path == NULL)
1419 goto err;
1420 memcpy(server->mnt_path, data->mnt_path, len);
1421 memcpy(&server->addr, data->addr, sizeof(struct sockaddr_in));
1422
1423 sb = sget(&nfs4_fs_type, nfs4_compare_super, nfs_set_super, server);
1424 if (IS_ERR(sb) || sb->s_root)
1425 goto free_path;
1426 return sb;
1427free_path:
1428 kfree(server->mnt_path);
1429err:
1430 server->mnt_path = NULL;
1431 return sb;
1432}
1433
1434static struct nfs_server *nfs4_referral_server(struct super_block *sb, struct nfs_clone_mount *data)
1435{
1436 struct nfs_server *server = NFS_SB(sb);
1437 struct rpc_timeout timeparms;
1438 int proto, timeo, retrans;
1439 void *err;
1440
1441 proto = IPPROTO_TCP;
1442 /* Since we are following a referral and there may be alternatives,
1443 set the timeouts and retries to low values */
1444 timeo = 2;
1445 retrans = 1;
1446 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
1447
1448 server->client = nfs4_create_client(server, &timeparms, proto, data->authflavor);
1449 if (IS_ERR((err = server->client)))
1450 goto out_err;
1451
1452 sb->s_time_gran = 1;
1453 sb->s_op = &nfs4_sops;
1454 err = ERR_PTR(nfs_sb_init(sb, data->authflavor));
1455 if (!IS_ERR(err))
1456 return server;
1457out_err:
1458 return (struct nfs_server *)err;
1459}
1460
1461static struct super_block *nfs_referral_nfs4_sb(struct file_system_type *fs_type,
1462 int flags, const char *dev_name, void *raw_data)
1463{
1464 struct nfs_clone_mount *data = raw_data;
1465 return nfs_clone_generic_sb(data, nfs4_referral_sb, nfs4_referral_server);
1466}
1467
1468#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-17 05:12:53 -0500