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[PATCH] vt: add TIOCL_GETKMSGREDIRECT
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / inode.c
blob2f7656b911b66df6f03a96561c2f03534ffa4241
1 /*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and 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 */
15
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/mm.h>
23 #include <linux/string.h>
24 #include <linux/stat.h>
25 #include <linux/errno.h>
26 #include <linux/unistd.h>
27 #include <linux/sunrpc/clnt.h>
28 #include <linux/sunrpc/stats.h>
29 #include <linux/sunrpc/metrics.h>
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_mount.h>
32 #include <linux/nfs4_mount.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/smp_lock.h>
35 #include <linux/seq_file.h>
36 #include <linux/mount.h>
37 #include <linux/nfs_idmap.h>
38 #include <linux/vfs.h>
39
40 #include <asm/system.h>
41 #include <asm/uaccess.h>
42
43 #include "nfs4_fs.h"
44 #include "callback.h"
45 #include "delegation.h"
46 #include "iostat.h"
47
48 #define NFSDBG_FACILITY NFSDBG_VFS
49 #define NFS_PARANOIA 1
50
51 /* Maximum number of readahead requests
52 * FIXME: this should really be a sysctl so that users may tune it to suit
53 * their needs. People that do NFS over a slow network, might for
54 * instance want to reduce it to something closer to 1 for improved
55 * interactive response.
56 */
57 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
58
59 static void nfs_invalidate_inode(struct inode *);
60 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
61
62 static struct inode *nfs_alloc_inode(struct super_block *sb);
63 static void nfs_destroy_inode(struct inode *);
64 static int nfs_write_inode(struct inode *,int);
65 static void nfs_delete_inode(struct inode *);
66 static void nfs_clear_inode(struct inode *);
67 static void nfs_umount_begin(struct super_block *);
68 static int nfs_statfs(struct super_block *, struct kstatfs *);
69 static int nfs_show_options(struct seq_file *, struct vfsmount *);
70 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
71 static void nfs_zap_acl_cache(struct inode *);
72
73 static struct rpc_program nfs_program;
74
75 static struct super_operations nfs_sops = {
76 .alloc_inode = nfs_alloc_inode,
77 .destroy_inode = nfs_destroy_inode,
78 .write_inode = nfs_write_inode,
79 .delete_inode = nfs_delete_inode,
80 .statfs = nfs_statfs,
81 .clear_inode = nfs_clear_inode,
82 .umount_begin = nfs_umount_begin,
83 .show_options = nfs_show_options,
84 .show_stats = nfs_show_stats,
85 };
86
87 /*
88 * RPC cruft for NFS
89 */
90 static struct rpc_stat nfs_rpcstat = {
91 .program = &nfs_program
92 };
93 static struct rpc_version * nfs_version[] = {
94 NULL,
95 NULL,
96 &nfs_version2,
97 #if defined(CONFIG_NFS_V3)
98 &nfs_version3,
99 #elif defined(CONFIG_NFS_V4)
100 NULL,
101 #endif
102 #if defined(CONFIG_NFS_V4)
103 &nfs_version4,
104 #endif
105 };
106
107 static struct rpc_program nfs_program = {
108 .name = "nfs",
109 .number = NFS_PROGRAM,
110 .nrvers = ARRAY_SIZE(nfs_version),
111 .version = nfs_version,
112 .stats = &nfs_rpcstat,
113 .pipe_dir_name = "/nfs",
114 };
115
116 #ifdef CONFIG_NFS_V3_ACL
117 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
118 static struct rpc_version * nfsacl_version[] = {
119 [3] = &nfsacl_version3,
120 };
121
122 struct rpc_program nfsacl_program = {
123 .name = "nfsacl",
124 .number = NFS_ACL_PROGRAM,
125 .nrvers = ARRAY_SIZE(nfsacl_version),
126 .version = nfsacl_version,
127 .stats = &nfsacl_rpcstat,
128 };
129 #endif /* CONFIG_NFS_V3_ACL */
130
131 static inline unsigned long
132 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
133 {
134 return nfs_fileid_to_ino_t(fattr->fileid);
135 }
136
137 static int
138 nfs_write_inode(struct inode *inode, int sync)
139 {
140 int flags = sync ? FLUSH_SYNC : 0;
141 int ret;
142
143 ret = nfs_commit_inode(inode, flags);
144 if (ret < 0)
145 return ret;
146 return 0;
147 }
148
149 static void
150 nfs_delete_inode(struct inode * inode)
151 {
152 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
153
154 truncate_inode_pages(&inode->i_data, 0);
155
156 nfs_wb_all(inode);
157 /*
158 * The following should never happen...
159 */
160 if (nfs_have_writebacks(inode)) {
161 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
162 }
163
164 clear_inode(inode);
165 }
166
167 static void
168 nfs_clear_inode(struct inode *inode)
169 {
170 struct nfs_inode *nfsi = NFS_I(inode);
171 struct rpc_cred *cred;
172
173 nfs_wb_all(inode);
174 BUG_ON (!list_empty(&nfsi->open_files));
175 nfs_zap_acl_cache(inode);
176 cred = nfsi->cache_access.cred;
177 if (cred)
178 put_rpccred(cred);
179 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
180 }
181
182 void
183 nfs_umount_begin(struct super_block *sb)
184 {
185 struct rpc_clnt *rpc = NFS_SB(sb)->client;
186
187 /* -EIO all pending I/O */
188 if (!IS_ERR(rpc))
189 rpc_killall_tasks(rpc);
190 rpc = NFS_SB(sb)->client_acl;
191 if (!IS_ERR(rpc))
192 rpc_killall_tasks(rpc);
193 }
194
195
196 static inline unsigned long
197 nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
198 {
199 /* make sure blocksize is a power of two */
200 if ((bsize & (bsize - 1)) || nrbitsp) {
201 unsigned char nrbits;
202
203 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
204 ;
205 bsize = 1 << nrbits;
206 if (nrbitsp)
207 *nrbitsp = nrbits;
208 }
209
210 return bsize;
211 }
212
213 /*
214 * Calculate the number of 512byte blocks used.
215 */
216 static inline unsigned long
217 nfs_calc_block_size(u64 tsize)
218 {
219 loff_t used = (tsize + 511) >> 9;
220 return (used > ULONG_MAX) ? ULONG_MAX : used;
221 }
222
223 /*
224 * Compute and set NFS server blocksize
225 */
226 static inline unsigned long
227 nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
228 {
229 if (bsize < NFS_MIN_FILE_IO_SIZE)
230 bsize = NFS_DEF_FILE_IO_SIZE;
231 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
232 bsize = NFS_MAX_FILE_IO_SIZE;
233
234 return nfs_block_bits(bsize, nrbitsp);
235 }
236
237 /*
238 * Obtain the root inode of the file system.
239 */
240 static struct inode *
241 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
242 {
243 struct nfs_server *server = NFS_SB(sb);
244 int error;
245
246 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
247 if (error < 0) {
248 dprintk("nfs_get_root: getattr error = %d\n", -error);
249 return ERR_PTR(error);
250 }
251
252 return nfs_fhget(sb, rootfh, fsinfo->fattr);
253 }
254
255 /*
256 * Do NFS version-independent mount processing, and sanity checking
257 */
258 static int
259 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
260 {
261 struct nfs_server *server;
262 struct inode *root_inode;
263 struct nfs_fattr fattr;
264 struct nfs_fsinfo fsinfo = {
265 .fattr = &fattr,
266 };
267 struct nfs_pathconf pathinfo = {
268 .fattr = &fattr,
269 };
270 int no_root_error = 0;
271 unsigned long max_rpc_payload;
272
273 /* We probably want something more informative here */
274 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
275
276 server = NFS_SB(sb);
277
278 sb->s_magic = NFS_SUPER_MAGIC;
279
280 server->io_stats = nfs_alloc_iostats();
281 if (server->io_stats == NULL)
282 return -ENOMEM;
283
284 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
285 /* Did getting the root inode fail? */
286 if (IS_ERR(root_inode)) {
287 no_root_error = PTR_ERR(root_inode);
288 goto out_no_root;
289 }
290 sb->s_root = d_alloc_root(root_inode);
291 if (!sb->s_root) {
292 no_root_error = -ENOMEM;
293 goto out_no_root;
294 }
295 sb->s_root->d_op = server->rpc_ops->dentry_ops;
296
297 /* mount time stamp, in seconds */
298 server->mount_time = jiffies;
299
300 /* Get some general file system info */
301 if (server->namelen == 0 &&
302 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
303 server->namelen = pathinfo.max_namelen;
304 /* Work out a lot of parameters */
305 if (server->rsize == 0)
306 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
307 if (server->wsize == 0)
308 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
309
310 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
311 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
312 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
313 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
314
315 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
316 if (server->rsize > max_rpc_payload)
317 server->rsize = max_rpc_payload;
318 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
319 server->rsize = NFS_MAX_FILE_IO_SIZE;
320 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
321
322 if (server->wsize > max_rpc_payload)
323 server->wsize = max_rpc_payload;
324 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
325 server->wsize = NFS_MAX_FILE_IO_SIZE;
326 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
327
328 if (sb->s_blocksize == 0)
329 sb->s_blocksize = nfs_block_bits(server->wsize,
330 &sb->s_blocksize_bits);
331 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
332
333 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
334 if (server->dtsize > PAGE_CACHE_SIZE)
335 server->dtsize = PAGE_CACHE_SIZE;
336 if (server->dtsize > server->rsize)
337 server->dtsize = server->rsize;
338
339 if (server->flags & NFS_MOUNT_NOAC) {
340 server->acregmin = server->acregmax = 0;
341 server->acdirmin = server->acdirmax = 0;
342 sb->s_flags |= MS_SYNCHRONOUS;
343 }
344 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
345
346 sb->s_maxbytes = fsinfo.maxfilesize;
347 if (sb->s_maxbytes > MAX_LFS_FILESIZE)
348 sb->s_maxbytes = MAX_LFS_FILESIZE;
349
350 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
351 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
352
353 /* We're airborne Set socket buffersize */
354 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
355 return 0;
356 /* Yargs. It didn't work out. */
357 out_no_root:
358 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
359 if (!IS_ERR(root_inode))
360 iput(root_inode);
361 return no_root_error;
362 }
363
364 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
365 {
366 to->to_initval = timeo * HZ / 10;
367 to->to_retries = retrans;
368 if (!to->to_retries)
369 to->to_retries = 2;
370
371 switch (proto) {
372 case IPPROTO_TCP:
373 if (!to->to_initval)
374 to->to_initval = 60 * HZ;
375 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
376 to->to_initval = NFS_MAX_TCP_TIMEOUT;
377 to->to_increment = to->to_initval;
378 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
379 to->to_exponential = 0;
380 break;
381 case IPPROTO_UDP:
382 default:
383 if (!to->to_initval)
384 to->to_initval = 11 * HZ / 10;
385 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
386 to->to_initval = NFS_MAX_UDP_TIMEOUT;
387 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
388 to->to_exponential = 1;
389 break;
390 }
391 }
392
393 /*
394 * Create an RPC client handle.
395 */
396 static struct rpc_clnt *
397 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
398 {
399 struct rpc_timeout timeparms;
400 struct rpc_xprt *xprt = NULL;
401 struct rpc_clnt *clnt = NULL;
402 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
403
404 nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
405
406 server->retrans_timeo = timeparms.to_initval;
407 server->retrans_count = timeparms.to_retries;
408
409 /* create transport and client */
410 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
411 if (IS_ERR(xprt)) {
412 dprintk("%s: cannot create RPC transport. Error = %ld\n",
413 __FUNCTION__, PTR_ERR(xprt));
414 return (struct rpc_clnt *)xprt;
415 }
416 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
417 server->rpc_ops->version, data->pseudoflavor);
418 if (IS_ERR(clnt)) {
419 dprintk("%s: cannot create RPC client. Error = %ld\n",
420 __FUNCTION__, PTR_ERR(xprt));
421 goto out_fail;
422 }
423
424 clnt->cl_intr = 1;
425 clnt->cl_softrtry = 1;
426
427 return clnt;
428
429 out_fail:
430 return clnt;
431 }
432
433 /*
434 * The way this works is that the mount process passes a structure
435 * in the data argument which contains the server's IP address
436 * and the root file handle obtained from the server's mount
437 * daemon. We stash these away in the private superblock fields.
438 */
439 static int
440 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
441 {
442 struct nfs_server *server;
443 rpc_authflavor_t authflavor;
444
445 server = NFS_SB(sb);
446 sb->s_blocksize_bits = 0;
447 sb->s_blocksize = 0;
448 if (data->bsize)
449 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
450 if (data->rsize)
451 server->rsize = nfs_block_size(data->rsize, NULL);
452 if (data->wsize)
453 server->wsize = nfs_block_size(data->wsize, NULL);
454 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
455
456 server->acregmin = data->acregmin*HZ;
457 server->acregmax = data->acregmax*HZ;
458 server->acdirmin = data->acdirmin*HZ;
459 server->acdirmax = data->acdirmax*HZ;
460
461 /* Start lockd here, before we might error out */
462 if (!(server->flags & NFS_MOUNT_NONLM))
463 lockd_up();
464
465 server->namelen = data->namlen;
466 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
467 if (!server->hostname)
468 return -ENOMEM;
469 strcpy(server->hostname, data->hostname);
470
471 /* Check NFS protocol revision and initialize RPC op vector
472 * and file handle pool. */
473 #ifdef CONFIG_NFS_V3
474 if (server->flags & NFS_MOUNT_VER3) {
475 server->rpc_ops = &nfs_v3_clientops;
476 server->caps |= NFS_CAP_READDIRPLUS;
477 } else {
478 server->rpc_ops = &nfs_v2_clientops;
479 }
480 #else
481 server->rpc_ops = &nfs_v2_clientops;
482 #endif
483
484 /* Fill in pseudoflavor for mount version < 5 */
485 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
486 data->pseudoflavor = RPC_AUTH_UNIX;
487 authflavor = data->pseudoflavor; /* save for sb_init() */
488 /* XXX maybe we want to add a server->pseudoflavor field */
489
490 /* Create RPC client handles */
491 server->client = nfs_create_client(server, data);
492 if (IS_ERR(server->client))
493 return PTR_ERR(server->client);
494 /* RFC 2623, sec 2.3.2 */
495 if (authflavor != RPC_AUTH_UNIX) {
496 struct rpc_auth *auth;
497
498 server->client_sys = rpc_clone_client(server->client);
499 if (IS_ERR(server->client_sys))
500 return PTR_ERR(server->client_sys);
501 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
502 if (IS_ERR(auth))
503 return PTR_ERR(auth);
504 } else {
505 atomic_inc(&server->client->cl_count);
506 server->client_sys = server->client;
507 }
508 if (server->flags & NFS_MOUNT_VER3) {
509 #ifdef CONFIG_NFS_V3_ACL
510 if (!(server->flags & NFS_MOUNT_NOACL)) {
511 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
512 /* No errors! Assume that Sun nfsacls are supported */
513 if (!IS_ERR(server->client_acl))
514 server->caps |= NFS_CAP_ACLS;
515 }
516 #else
517 server->flags &= ~NFS_MOUNT_NOACL;
518 #endif /* CONFIG_NFS_V3_ACL */
519 /*
520 * The VFS shouldn't apply the umask to mode bits. We will
521 * do so ourselves when necessary.
522 */
523 sb->s_flags |= MS_POSIXACL;
524 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
525 server->namelen = NFS3_MAXNAMLEN;
526 sb->s_time_gran = 1;
527 } else {
528 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
529 server->namelen = NFS2_MAXNAMLEN;
530 }
531
532 sb->s_op = &nfs_sops;
533 return nfs_sb_init(sb, authflavor);
534 }
535
536 static int
537 nfs_statfs(struct super_block *sb, struct kstatfs *buf)
538 {
539 struct nfs_server *server = NFS_SB(sb);
540 unsigned char blockbits;
541 unsigned long blockres;
542 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
543 struct nfs_fattr fattr;
544 struct nfs_fsstat res = {
545 .fattr = &fattr,
546 };
547 int error;
548
549 lock_kernel();
550
551 error = server->rpc_ops->statfs(server, rootfh, &res);
552 buf->f_type = NFS_SUPER_MAGIC;
553 if (error < 0)
554 goto out_err;
555
556 /*
557 * Current versions of glibc do not correctly handle the
558 * case where f_frsize != f_bsize. Eventually we want to
559 * report the value of wtmult in this field.
560 */
561 buf->f_frsize = sb->s_blocksize;
562
563 /*
564 * On most *nix systems, f_blocks, f_bfree, and f_bavail
565 * are reported in units of f_frsize. Linux hasn't had
566 * an f_frsize field in its statfs struct until recently,
567 * thus historically Linux's sys_statfs reports these
568 * fields in units of f_bsize.
569 */
570 buf->f_bsize = sb->s_blocksize;
571 blockbits = sb->s_blocksize_bits;
572 blockres = (1 << blockbits) - 1;
573 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
574 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
575 buf->f_bavail = (res.abytes + blockres) >> blockbits;
576
577 buf->f_files = res.tfiles;
578 buf->f_ffree = res.afiles;
579
580 buf->f_namelen = server->namelen;
581 out:
582 unlock_kernel();
583 return 0;
584
585 out_err:
586 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
587 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
588 goto out;
589
590 }
591
592 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
593 {
594 static struct proc_nfs_info {
595 int flag;
596 char *str;
597 char *nostr;
598 } nfs_info[] = {
599 { NFS_MOUNT_SOFT, ",soft", ",hard" },
600 { NFS_MOUNT_INTR, ",intr", "" },
601 { NFS_MOUNT_NOCTO, ",nocto", "" },
602 { NFS_MOUNT_NOAC, ",noac", "" },
603 { NFS_MOUNT_NONLM, ",nolock", "" },
604 { NFS_MOUNT_NOACL, ",noacl", "" },
605 { 0, NULL, NULL }
606 };
607 struct proc_nfs_info *nfs_infop;
608 char buf[12];
609 char *proto;
610
611 seq_printf(m, ",vers=%d", nfss->rpc_ops->version);
612 seq_printf(m, ",rsize=%d", nfss->rsize);
613 seq_printf(m, ",wsize=%d", nfss->wsize);
614 if (nfss->acregmin != 3*HZ || showdefaults)
615 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
616 if (nfss->acregmax != 60*HZ || showdefaults)
617 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
618 if (nfss->acdirmin != 30*HZ || showdefaults)
619 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
620 if (nfss->acdirmax != 60*HZ || showdefaults)
621 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
622 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
623 if (nfss->flags & nfs_infop->flag)
624 seq_puts(m, nfs_infop->str);
625 else
626 seq_puts(m, nfs_infop->nostr);
627 }
628 switch (nfss->client->cl_xprt->prot) {
629 case IPPROTO_TCP:
630 proto = "tcp";
631 break;
632 case IPPROTO_UDP:
633 proto = "udp";
634 break;
635 default:
636 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
637 proto = buf;
638 }
639 seq_printf(m, ",proto=%s", proto);
640 seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ);
641 seq_printf(m, ",retrans=%u", nfss->retrans_count);
642 }
643
644 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
645 {
646 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
647
648 nfs_show_mount_options(m, nfss, 0);
649
650 seq_puts(m, ",addr=");
651 seq_escape(m, nfss->hostname, " \t\n\\");
652
653 return 0;
654 }
655
656 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
657 {
658 int i, cpu;
659 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
660 struct rpc_auth *auth = nfss->client->cl_auth;
661 struct nfs_iostats totals = { };
662
663 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
664
665 /*
666 * Display all mount option settings
667 */
668 seq_printf(m, "\n\topts:\t");
669 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
670 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
671 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
672 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
673 nfs_show_mount_options(m, nfss, 1);
674
675 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
676
677 seq_printf(m, "\n\tcaps:\t");
678 seq_printf(m, "caps=0x%x", nfss->caps);
679 seq_printf(m, ",wtmult=%d", nfss->wtmult);
680 seq_printf(m, ",dtsize=%d", nfss->dtsize);
681 seq_printf(m, ",bsize=%d", nfss->bsize);
682 seq_printf(m, ",namelen=%d", nfss->namelen);
683
684 #ifdef CONFIG_NFS_V4
685 if (nfss->rpc_ops->version == 4) {
686 seq_printf(m, "\n\tnfsv4:\t");
687 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
688 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
689 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
690 }
691 #endif
692
693 /*
694 * Display security flavor in effect for this mount
695 */
696 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
697 if (auth->au_flavor)
698 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
699
700 /*
701 * Display superblock I/O counters
702 */
703 for (cpu = 0; cpu < NR_CPUS; cpu++) {
704 struct nfs_iostats *stats;
705
706 if (!cpu_possible(cpu))
707 continue;
708
709 preempt_disable();
710 stats = per_cpu_ptr(nfss->io_stats, cpu);
711
712 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
713 totals.events[i] += stats->events[i];
714 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
715 totals.bytes[i] += stats->bytes[i];
716
717 preempt_enable();
718 }
719
720 seq_printf(m, "\n\tevents:\t");
721 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
722 seq_printf(m, "%lu ", totals.events[i]);
723 seq_printf(m, "\n\tbytes:\t");
724 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
725 seq_printf(m, "%Lu ", totals.bytes[i]);
726 seq_printf(m, "\n");
727
728 rpc_print_iostats(m, nfss->client);
729
730 return 0;
731 }
732
733 /**
734 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
735 */
736 int nfs_sync_mapping(struct address_space *mapping)
737 {
738 int ret;
739
740 if (mapping->nrpages == 0)
741 return 0;
742 unmap_mapping_range(mapping, 0, 0, 0);
743 ret = filemap_write_and_wait(mapping);
744 if (ret != 0)
745 goto out;
746 ret = nfs_wb_all(mapping->host);
747 out:
748 return ret;
749 }
750
751 /*
752 * Invalidate the local caches
753 */
754 static void nfs_zap_caches_locked(struct inode *inode)
755 {
756 struct nfs_inode *nfsi = NFS_I(inode);
757 int mode = inode->i_mode;
758
759 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
760
761 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
762 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
763
764 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
765 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
766 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
767 else
768 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
769 }
770
771 void nfs_zap_caches(struct inode *inode)
772 {
773 spin_lock(&inode->i_lock);
774 nfs_zap_caches_locked(inode);
775 spin_unlock(&inode->i_lock);
776 }
777
778 static void nfs_zap_acl_cache(struct inode *inode)
779 {
780 void (*clear_acl_cache)(struct inode *);
781
782 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
783 if (clear_acl_cache != NULL)
784 clear_acl_cache(inode);
785 spin_lock(&inode->i_lock);
786 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
787 spin_unlock(&inode->i_lock);
788 }
789
790 /*
791 * Invalidate, but do not unhash, the inode.
792 * NB: must be called with inode->i_lock held!
793 */
794 static void nfs_invalidate_inode(struct inode *inode)
795 {
796 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
797 nfs_zap_caches_locked(inode);
798 }
799
800 struct nfs_find_desc {
801 struct nfs_fh *fh;
802 struct nfs_fattr *fattr;
803 };
804
805 /*
806 * In NFSv3 we can have 64bit inode numbers. In order to support
807 * this, and re-exported directories (also seen in NFSv2)
808 * we are forced to allow 2 different inodes to have the same
809 * i_ino.
810 */
811 static int
812 nfs_find_actor(struct inode *inode, void *opaque)
813 {
814 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
815 struct nfs_fh *fh = desc->fh;
816 struct nfs_fattr *fattr = desc->fattr;
817
818 if (NFS_FILEID(inode) != fattr->fileid)
819 return 0;
820 if (nfs_compare_fh(NFS_FH(inode), fh))
821 return 0;
822 if (is_bad_inode(inode) || NFS_STALE(inode))
823 return 0;
824 return 1;
825 }
826
827 static int
828 nfs_init_locked(struct inode *inode, void *opaque)
829 {
830 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
831 struct nfs_fattr *fattr = desc->fattr;
832
833 NFS_FILEID(inode) = fattr->fileid;
834 nfs_copy_fh(NFS_FH(inode), desc->fh);
835 return 0;
836 }
837
838 /* Don't use READDIRPLUS on directories that we believe are too large */
839 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
840
841 /*
842 * This is our front-end to iget that looks up inodes by file handle
843 * instead of inode number.
844 */
845 struct inode *
846 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
847 {
848 struct nfs_find_desc desc = {
849 .fh = fh,
850 .fattr = fattr
851 };
852 struct inode *inode = ERR_PTR(-ENOENT);
853 unsigned long hash;
854
855 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
856 goto out_no_inode;
857
858 if (!fattr->nlink) {
859 printk("NFS: Buggy server - nlink == 0!\n");
860 goto out_no_inode;
861 }
862
863 hash = nfs_fattr_to_ino_t(fattr);
864
865 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
866 if (inode == NULL) {
867 inode = ERR_PTR(-ENOMEM);
868 goto out_no_inode;
869 }
870
871 if (inode->i_state & I_NEW) {
872 struct nfs_inode *nfsi = NFS_I(inode);
873
874 /* We set i_ino for the few things that still rely on it,
875 * such as stat(2) */
876 inode->i_ino = hash;
877
878 /* We can't support update_atime(), since the server will reset it */
879 inode->i_flags |= S_NOATIME|S_NOCMTIME;
880 inode->i_mode = fattr->mode;
881 /* Why so? Because we want revalidate for devices/FIFOs, and
882 * that's precisely what we have in nfs_file_inode_operations.
883 */
884 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
885 if (S_ISREG(inode->i_mode)) {
886 inode->i_fop = &nfs_file_operations;
887 inode->i_data.a_ops = &nfs_file_aops;
888 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
889 } else if (S_ISDIR(inode->i_mode)) {
890 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
891 inode->i_fop = &nfs_dir_operations;
892 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
893 && fattr->size <= NFS_LIMIT_READDIRPLUS)
894 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
895 } else if (S_ISLNK(inode->i_mode))
896 inode->i_op = &nfs_symlink_inode_operations;
897 else
898 init_special_inode(inode, inode->i_mode, fattr->rdev);
899
900 nfsi->read_cache_jiffies = fattr->time_start;
901 nfsi->last_updated = jiffies;
902 inode->i_atime = fattr->atime;
903 inode->i_mtime = fattr->mtime;
904 inode->i_ctime = fattr->ctime;
905 if (fattr->valid & NFS_ATTR_FATTR_V4)
906 nfsi->change_attr = fattr->change_attr;
907 inode->i_size = nfs_size_to_loff_t(fattr->size);
908 inode->i_nlink = fattr->nlink;
909 inode->i_uid = fattr->uid;
910 inode->i_gid = fattr->gid;
911 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
912 /*
913 * report the blocks in 512byte units
914 */
915 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
916 inode->i_blksize = inode->i_sb->s_blocksize;
917 } else {
918 inode->i_blocks = fattr->du.nfs2.blocks;
919 inode->i_blksize = fattr->du.nfs2.blocksize;
920 }
921 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
922 nfsi->attrtimeo_timestamp = jiffies;
923 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
924 nfsi->cache_access.cred = NULL;
925
926 unlock_new_inode(inode);
927 } else
928 nfs_refresh_inode(inode, fattr);
929 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
930 inode->i_sb->s_id,
931 (long long)NFS_FILEID(inode),
932 atomic_read(&inode->i_count));
933
934 out:
935 return inode;
936
937 out_no_inode:
938 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
939 goto out;
940 }
941
942 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
943
944 int
945 nfs_setattr(struct dentry *dentry, struct iattr *attr)
946 {
947 struct inode *inode = dentry->d_inode;
948 struct nfs_fattr fattr;
949 int error;
950
951 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
952
953 if (attr->ia_valid & ATTR_SIZE) {
954 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
955 attr->ia_valid &= ~ATTR_SIZE;
956 }
957
958 /* Optimization: if the end result is no change, don't RPC */
959 attr->ia_valid &= NFS_VALID_ATTRS;
960 if (attr->ia_valid == 0)
961 return 0;
962
963 lock_kernel();
964 nfs_begin_data_update(inode);
965 /* Write all dirty data */
966 filemap_write_and_wait(inode->i_mapping);
967 nfs_wb_all(inode);
968 /*
969 * Return any delegations if we're going to change ACLs
970 */
971 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
972 nfs_inode_return_delegation(inode);
973 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
974 if (error == 0)
975 nfs_refresh_inode(inode, &fattr);
976 nfs_end_data_update(inode);
977 unlock_kernel();
978 return error;
979 }
980
981 /**
982 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
983 * @inode: pointer to struct inode
984 * @attr: pointer to struct iattr
985 *
986 * Note: we do this in the *proc.c in order to ensure that
987 * it works for things like exclusive creates too.
988 */
989 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
990 {
991 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
992 if ((attr->ia_valid & ATTR_MODE) != 0) {
993 int mode = attr->ia_mode & S_IALLUGO;
994 mode |= inode->i_mode & ~S_IALLUGO;
995 inode->i_mode = mode;
996 }
997 if ((attr->ia_valid & ATTR_UID) != 0)
998 inode->i_uid = attr->ia_uid;
999 if ((attr->ia_valid & ATTR_GID) != 0)
1000 inode->i_gid = attr->ia_gid;
1001 spin_lock(&inode->i_lock);
1002 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1003 spin_unlock(&inode->i_lock);
1004 }
1005 if ((attr->ia_valid & ATTR_SIZE) != 0) {
1006 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
1007 inode->i_size = attr->ia_size;
1008 vmtruncate(inode, attr->ia_size);
1009 }
1010 }
1011
1012 static int nfs_wait_schedule(void *word)
1013 {
1014 if (signal_pending(current))
1015 return -ERESTARTSYS;
1016 schedule();
1017 return 0;
1018 }
1019
1020 /*
1021 * Wait for the inode to get unlocked.
1022 */
1023 static int nfs_wait_on_inode(struct inode *inode)
1024 {
1025 struct rpc_clnt *clnt = NFS_CLIENT(inode);
1026 struct nfs_inode *nfsi = NFS_I(inode);
1027 sigset_t oldmask;
1028 int error;
1029
1030 rpc_clnt_sigmask(clnt, &oldmask);
1031 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
1032 nfs_wait_schedule, TASK_INTERRUPTIBLE);
1033 rpc_clnt_sigunmask(clnt, &oldmask);
1034
1035 return error;
1036 }
1037
1038 static void nfs_wake_up_inode(struct inode *inode)
1039 {
1040 struct nfs_inode *nfsi = NFS_I(inode);
1041
1042 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
1043 smp_mb__after_clear_bit();
1044 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
1045 }
1046
1047 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1048 {
1049 struct inode *inode = dentry->d_inode;
1050 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
1051 int err;
1052
1053 /* Flush out writes to the server in order to update c/mtime */
1054 nfs_sync_inode_wait(inode, 0, 0, FLUSH_NOCOMMIT);
1055
1056 /*
1057 * We may force a getattr if the user cares about atime.
1058 *
1059 * Note that we only have to check the vfsmount flags here:
1060 * - NFS always sets S_NOATIME by so checking it would give a
1061 * bogus result
1062 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
1063 * no point in checking those.
1064 */
1065 if ((mnt->mnt_flags & MNT_NOATIME) ||
1066 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1067 need_atime = 0;
1068
1069 if (need_atime)
1070 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1071 else
1072 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
1073 if (!err)
1074 generic_fillattr(inode, stat);
1075 return err;
1076 }
1077
1078 static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
1079 {
1080 struct nfs_open_context *ctx;
1081
1082 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
1083 if (ctx != NULL) {
1084 atomic_set(&ctx->count, 1);
1085 ctx->dentry = dget(dentry);
1086 ctx->vfsmnt = mntget(mnt);
1087 ctx->cred = get_rpccred(cred);
1088 ctx->state = NULL;
1089 ctx->lockowner = current->files;
1090 ctx->error = 0;
1091 ctx->dir_cookie = 0;
1092 }
1093 return ctx;
1094 }
1095
1096 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1097 {
1098 if (ctx != NULL)
1099 atomic_inc(&ctx->count);
1100 return ctx;
1101 }
1102
1103 void put_nfs_open_context(struct nfs_open_context *ctx)
1104 {
1105 if (atomic_dec_and_test(&ctx->count)) {
1106 if (!list_empty(&ctx->list)) {
1107 struct inode *inode = ctx->dentry->d_inode;
1108 spin_lock(&inode->i_lock);
1109 list_del(&ctx->list);
1110 spin_unlock(&inode->i_lock);
1111 }
1112 if (ctx->state != NULL)
1113 nfs4_close_state(ctx->state, ctx->mode);
1114 if (ctx->cred != NULL)
1115 put_rpccred(ctx->cred);
1116 dput(ctx->dentry);
1117 mntput(ctx->vfsmnt);
1118 kfree(ctx);
1119 }
1120 }
1121
1122 /*
1123 * Ensure that mmap has a recent RPC credential for use when writing out
1124 * shared pages
1125 */
1126 static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1127 {
1128 struct inode *inode = filp->f_dentry->d_inode;
1129 struct nfs_inode *nfsi = NFS_I(inode);
1130
1131 filp->private_data = get_nfs_open_context(ctx);
1132 spin_lock(&inode->i_lock);
1133 list_add(&ctx->list, &nfsi->open_files);
1134 spin_unlock(&inode->i_lock);
1135 }
1136
1137 /*
1138 * Given an inode, search for an open context with the desired characteristics
1139 */
1140 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
1141 {
1142 struct nfs_inode *nfsi = NFS_I(inode);
1143 struct nfs_open_context *pos, *ctx = NULL;
1144
1145 spin_lock(&inode->i_lock);
1146 list_for_each_entry(pos, &nfsi->open_files, list) {
1147 if (cred != NULL && pos->cred != cred)
1148 continue;
1149 if ((pos->mode & mode) == mode) {
1150 ctx = get_nfs_open_context(pos);
1151 break;
1152 }
1153 }
1154 spin_unlock(&inode->i_lock);
1155 return ctx;
1156 }
1157
1158 static void nfs_file_clear_open_context(struct file *filp)
1159 {
1160 struct inode *inode = filp->f_dentry->d_inode;
1161 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
1162
1163 if (ctx) {
1164 filp->private_data = NULL;
1165 spin_lock(&inode->i_lock);
1166 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1167 spin_unlock(&inode->i_lock);
1168 put_nfs_open_context(ctx);
1169 }
1170 }
1171
1172 /*
1173 * These allocate and release file read/write context information.
1174 */
1175 int nfs_open(struct inode *inode, struct file *filp)
1176 {
1177 struct nfs_open_context *ctx;
1178 struct rpc_cred *cred;
1179
1180 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1181 if (IS_ERR(cred))
1182 return PTR_ERR(cred);
1183 ctx = alloc_nfs_open_context(filp->f_vfsmnt, filp->f_dentry, cred);
1184 put_rpccred(cred);
1185 if (ctx == NULL)
1186 return -ENOMEM;
1187 ctx->mode = filp->f_mode;
1188 nfs_file_set_open_context(filp, ctx);
1189 put_nfs_open_context(ctx);
1190 return 0;
1191 }
1192
1193 int nfs_release(struct inode *inode, struct file *filp)
1194 {
1195 nfs_file_clear_open_context(filp);
1196 return 0;
1197 }
1198
1199 /*
1200 * This function is called whenever some part of NFS notices that
1201 * the cached attributes have to be refreshed.
1202 */
1203 int
1204 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1205 {
1206 int status = -ESTALE;
1207 struct nfs_fattr fattr;
1208 struct nfs_inode *nfsi = NFS_I(inode);
1209
1210 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1211 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1212
1213 lock_kernel();
1214 if (!inode || is_bad_inode(inode))
1215 goto out_nowait;
1216 if (NFS_STALE(inode))
1217 goto out_nowait;
1218
1219 status = nfs_wait_on_inode(inode);
1220 if (status < 0)
1221 goto out;
1222 if (NFS_STALE(inode)) {
1223 status = -ESTALE;
1224 /* Do we trust the cached ESTALE? */
1225 if (NFS_ATTRTIMEO(inode) != 0) {
1226 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
1227 /* no */
1228 } else
1229 goto out;
1230 }
1231 }
1232
1233 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1234 if (status != 0) {
1235 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1236 inode->i_sb->s_id,
1237 (long long)NFS_FILEID(inode), status);
1238 if (status == -ESTALE) {
1239 nfs_zap_caches(inode);
1240 if (!S_ISDIR(inode->i_mode))
1241 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1242 }
1243 goto out;
1244 }
1245
1246 spin_lock(&inode->i_lock);
1247 status = nfs_update_inode(inode, &fattr);
1248 if (status) {
1249 spin_unlock(&inode->i_lock);
1250 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1251 inode->i_sb->s_id,
1252 (long long)NFS_FILEID(inode), status);
1253 goto out;
1254 }
1255 spin_unlock(&inode->i_lock);
1256
1257 nfs_revalidate_mapping(inode, inode->i_mapping);
1258
1259 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1260 nfs_zap_acl_cache(inode);
1261
1262 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1263 inode->i_sb->s_id,
1264 (long long)NFS_FILEID(inode));
1265
1266 out:
1267 nfs_wake_up_inode(inode);
1268
1269 out_nowait:
1270 unlock_kernel();
1271 return status;
1272 }
1273
1274 int nfs_attribute_timeout(struct inode *inode)
1275 {
1276 struct nfs_inode *nfsi = NFS_I(inode);
1277
1278 if (nfs_have_delegation(inode, FMODE_READ))
1279 return 0;
1280 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1281 }
1282
1283 /**
1284 * nfs_revalidate_inode - Revalidate the inode attributes
1285 * @server - pointer to nfs_server struct
1286 * @inode - pointer to inode struct
1287 *
1288 * Updates inode attribute information by retrieving the data from the server.
1289 */
1290 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1291 {
1292 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1293 if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1294 && !nfs_attribute_timeout(inode))
1295 return NFS_STALE(inode) ? -ESTALE : 0;
1296 return __nfs_revalidate_inode(server, inode);
1297 }
1298
1299 /**
1300 * nfs_revalidate_mapping - Revalidate the pagecache
1301 * @inode - pointer to host inode
1302 * @mapping - pointer to mapping
1303 */
1304 void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1305 {
1306 struct nfs_inode *nfsi = NFS_I(inode);
1307
1308 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
1309 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1310 if (S_ISREG(inode->i_mode))
1311 nfs_sync_mapping(mapping);
1312 invalidate_inode_pages2(mapping);
1313
1314 spin_lock(&inode->i_lock);
1315 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1316 if (S_ISDIR(inode->i_mode)) {
1317 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1318 /* This ensures we revalidate child dentries */
1319 nfsi->cache_change_attribute = jiffies;
1320 }
1321 spin_unlock(&inode->i_lock);
1322
1323 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1324 inode->i_sb->s_id,
1325 (long long)NFS_FILEID(inode));
1326 }
1327 }
1328
1329 /**
1330 * nfs_begin_data_update
1331 * @inode - pointer to inode
1332 * Declare that a set of operations will update file data on the server
1333 */
1334 void nfs_begin_data_update(struct inode *inode)
1335 {
1336 atomic_inc(&NFS_I(inode)->data_updates);
1337 }
1338
1339 /**
1340 * nfs_end_data_update
1341 * @inode - pointer to inode
1342 * Declare end of the operations that will update file data
1343 * This will mark the inode as immediately needing revalidation
1344 * of its attribute cache.
1345 */
1346 void nfs_end_data_update(struct inode *inode)
1347 {
1348 struct nfs_inode *nfsi = NFS_I(inode);
1349
1350 if (!nfs_have_delegation(inode, FMODE_READ)) {
1351 /* Directories and symlinks: invalidate page cache */
1352 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
1353 spin_lock(&inode->i_lock);
1354 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1355 spin_unlock(&inode->i_lock);
1356 }
1357 }
1358 nfsi->cache_change_attribute = jiffies;
1359 atomic_dec(&nfsi->data_updates);
1360 }
1361
1362 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1363 {
1364 struct nfs_inode *nfsi = NFS_I(inode);
1365
1366 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1367 && nfsi->change_attr == fattr->pre_change_attr) {
1368 nfsi->change_attr = fattr->change_attr;
1369 nfsi->cache_change_attribute = jiffies;
1370 }
1371
1372 /* If we have atomic WCC data, we may update some attributes */
1373 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1374 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1375 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1376 nfsi->cache_change_attribute = jiffies;
1377 }
1378 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1379 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1380 nfsi->cache_change_attribute = jiffies;
1381 }
1382 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
1383 inode->i_size = fattr->size;
1384 nfsi->cache_change_attribute = jiffies;
1385 }
1386 }
1387 }
1388
1389 /**
1390 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1391 * @inode - pointer to inode
1392 * @fattr - updated attributes
1393 *
1394 * Verifies the attribute cache. If we have just changed the attributes,
1395 * so that fattr carries weak cache consistency data, then it may
1396 * also update the ctime/mtime/change_attribute.
1397 */
1398 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1399 {
1400 struct nfs_inode *nfsi = NFS_I(inode);
1401 loff_t cur_size, new_isize;
1402 int data_unstable;
1403
1404
1405 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1406 return 0;
1407
1408 /* Has the inode gone and changed behind our back? */
1409 if (nfsi->fileid != fattr->fileid
1410 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1411 return -EIO;
1412 }
1413
1414 /* Are we in the process of updating data on the server? */
1415 data_unstable = nfs_caches_unstable(inode);
1416
1417 /* Do atomic weak cache consistency updates */
1418 nfs_wcc_update_inode(inode, fattr);
1419
1420 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0) {
1421 if (nfsi->change_attr == fattr->change_attr)
1422 goto out;
1423 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1424 if (!data_unstable)
1425 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1426 }
1427
1428 /* Verify a few of the more important attributes */
1429 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1430 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1431 if (!data_unstable)
1432 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1433 }
1434
1435 cur_size = i_size_read(inode);
1436 new_isize = nfs_size_to_loff_t(fattr->size);
1437 if (cur_size != new_isize && nfsi->npages == 0)
1438 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1439
1440 /* Have any file permissions changed? */
1441 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1442 || inode->i_uid != fattr->uid
1443 || inode->i_gid != fattr->gid)
1444 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1445
1446 /* Has the link count changed? */
1447 if (inode->i_nlink != fattr->nlink)
1448 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1449
1450 out:
1451 if (!timespec_equal(&inode->i_atime, &fattr->atime))
1452 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
1453
1454 nfsi->read_cache_jiffies = fattr->time_start;
1455 return 0;
1456 }
1457
1458 /**
1459 * nfs_refresh_inode - try to update the inode attribute cache
1460 * @inode - pointer to inode
1461 * @fattr - updated attributes
1462 *
1463 * Check that an RPC call that returned attributes has not overlapped with
1464 * other recent updates of the inode metadata, then decide whether it is
1465 * safe to do a full update of the inode attributes, or whether just to
1466 * call nfs_check_inode_attributes.
1467 */
1468 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1469 {
1470 struct nfs_inode *nfsi = NFS_I(inode);
1471 int status;
1472
1473 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1474 return 0;
1475 spin_lock(&inode->i_lock);
1476 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1477 if (time_after(fattr->time_start, nfsi->last_updated))
1478 status = nfs_update_inode(inode, fattr);
1479 else
1480 status = nfs_check_inode_attributes(inode, fattr);
1481
1482 spin_unlock(&inode->i_lock);
1483 return status;
1484 }
1485
1486 /**
1487 * nfs_post_op_update_inode - try to update the inode attribute cache
1488 * @inode - pointer to inode
1489 * @fattr - updated attributes
1490 *
1491 * After an operation that has changed the inode metadata, mark the
1492 * attribute cache as being invalid, then try to update it.
1493 */
1494 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1495 {
1496 struct nfs_inode *nfsi = NFS_I(inode);
1497 int status = 0;
1498
1499 spin_lock(&inode->i_lock);
1500 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
1501 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
1502 goto out;
1503 }
1504 status = nfs_update_inode(inode, fattr);
1505 out:
1506 spin_unlock(&inode->i_lock);
1507 return status;
1508 }
1509
1510 /*
1511 * Many nfs protocol calls return the new file attributes after
1512 * an operation. Here we update the inode to reflect the state
1513 * of the server's inode.
1514 *
1515 * This is a bit tricky because we have to make sure all dirty pages
1516 * have been sent off to the server before calling invalidate_inode_pages.
1517 * To make sure no other process adds more write requests while we try
1518 * our best to flush them, we make them sleep during the attribute refresh.
1519 *
1520 * A very similar scenario holds for the dir cache.
1521 */
1522 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1523 {
1524 struct nfs_inode *nfsi = NFS_I(inode);
1525 loff_t cur_isize, new_isize;
1526 unsigned int invalid = 0;
1527 int data_stable;
1528
1529 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1530 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1531 atomic_read(&inode->i_count), fattr->valid);
1532
1533 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1534 return 0;
1535
1536 if (nfsi->fileid != fattr->fileid)
1537 goto out_fileid;
1538
1539 /*
1540 * Make sure the inode's type hasn't changed.
1541 */
1542 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1543 goto out_changed;
1544
1545 /*
1546 * Update the read time so we don't revalidate too often.
1547 */
1548 nfsi->read_cache_jiffies = fattr->time_start;
1549 nfsi->last_updated = jiffies;
1550
1551 /* Are we racing with known updates of the metadata on the server? */
1552 data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
1553 if (data_stable)
1554 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1555
1556 /* Do atomic weak cache consistency updates */
1557 nfs_wcc_update_inode(inode, fattr);
1558
1559 /* Check if our cached file size is stale */
1560 new_isize = nfs_size_to_loff_t(fattr->size);
1561 cur_isize = i_size_read(inode);
1562 if (new_isize != cur_isize) {
1563 /* Do we perhaps have any outstanding writes? */
1564 if (nfsi->npages == 0) {
1565 /* No, but did we race with nfs_end_data_update()? */
1566 if (data_stable) {
1567 inode->i_size = new_isize;
1568 invalid |= NFS_INO_INVALID_DATA;
1569 }
1570 invalid |= NFS_INO_INVALID_ATTR;
1571 } else if (new_isize > cur_isize) {
1572 inode->i_size = new_isize;
1573 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1574 }
1575 nfsi->cache_change_attribute = jiffies;
1576 dprintk("NFS: isize change on server for file %s/%ld\n",
1577 inode->i_sb->s_id, inode->i_ino);
1578 }
1579
1580 /* Check if the mtime agrees */
1581 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1582 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1583 dprintk("NFS: mtime change on server for file %s/%ld\n",
1584 inode->i_sb->s_id, inode->i_ino);
1585 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1586 nfsi->cache_change_attribute = jiffies;
1587 }
1588
1589 /* If ctime has changed we should definitely clear access+acl caches */
1590 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1591 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1592 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1593 nfsi->cache_change_attribute = jiffies;
1594 }
1595 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1596
1597 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1598 inode->i_uid != fattr->uid ||
1599 inode->i_gid != fattr->gid)
1600 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1601
1602 inode->i_mode = fattr->mode;
1603 inode->i_nlink = fattr->nlink;
1604 inode->i_uid = fattr->uid;
1605 inode->i_gid = fattr->gid;
1606
1607 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1608 /*
1609 * report the blocks in 512byte units
1610 */
1611 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1612 inode->i_blksize = inode->i_sb->s_blocksize;
1613 } else {
1614 inode->i_blocks = fattr->du.nfs2.blocks;
1615 inode->i_blksize = fattr->du.nfs2.blocksize;
1616 }
1617
1618 if ((fattr->valid & NFS_ATTR_FATTR_V4)) {
1619 if (nfsi->change_attr != fattr->change_attr) {
1620 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1621 inode->i_sb->s_id, inode->i_ino);
1622 nfsi->change_attr = fattr->change_attr;
1623 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1624 nfsi->cache_change_attribute = jiffies;
1625 } else
1626 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA);
1627 }
1628
1629 /* Update attrtimeo value if we're out of the unstable period */
1630 if (invalid & NFS_INO_INVALID_ATTR) {
1631 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1632 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1633 nfsi->attrtimeo_timestamp = jiffies;
1634 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1635 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1636 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1637 nfsi->attrtimeo_timestamp = jiffies;
1638 }
1639 /* Don't invalidate the data if we were to blame */
1640 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1641 || S_ISLNK(inode->i_mode)))
1642 invalid &= ~NFS_INO_INVALID_DATA;
1643 if (data_stable)
1644 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
1645 if (!nfs_have_delegation(inode, FMODE_READ))
1646 nfsi->cache_validity |= invalid;
1647
1648 return 0;
1649 out_changed:
1650 /*
1651 * Big trouble! The inode has become a different object.
1652 */
1653 #ifdef NFS_PARANOIA
1654 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1655 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1656 #endif
1657 out_err:
1658 /*
1659 * No need to worry about unhashing the dentry, as the
1660 * lookup validation will know that the inode is bad.
1661 * (But we fall through to invalidate the caches.)
1662 */
1663 nfs_invalidate_inode(inode);
1664 return -ESTALE;
1665
1666 out_fileid:
1667 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1668 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1669 NFS_SERVER(inode)->hostname, inode->i_sb->s_id,
1670 (long long)nfsi->fileid, (long long)fattr->fileid);
1671 goto out_err;
1672 }
1673
1674 /*
1675 * File system information
1676 */
1677
1678 static int nfs_set_super(struct super_block *s, void *data)
1679 {
1680 s->s_fs_info = data;
1681 return set_anon_super(s, data);
1682 }
1683
1684 static int nfs_compare_super(struct super_block *sb, void *data)
1685 {
1686 struct nfs_server *server = data;
1687 struct nfs_server *old = NFS_SB(sb);
1688
1689 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1690 return 0;
1691 if (old->addr.sin_port != server->addr.sin_port)
1692 return 0;
1693 return !nfs_compare_fh(&old->fh, &server->fh);
1694 }
1695
1696 static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1697 int flags, const char *dev_name, void *raw_data)
1698 {
1699 int error;
1700 struct nfs_server *server = NULL;
1701 struct super_block *s;
1702 struct nfs_fh *root;
1703 struct nfs_mount_data *data = raw_data;
1704
1705 s = ERR_PTR(-EINVAL);
1706 if (data == NULL) {
1707 dprintk("%s: missing data argument\n", __FUNCTION__);
1708 goto out_err;
1709 }
1710 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1711 dprintk("%s: bad mount version\n", __FUNCTION__);
1712 goto out_err;
1713 }
1714 switch (data->version) {
1715 case 1:
1716 data->namlen = 0;
1717 case 2:
1718 data->bsize = 0;
1719 case 3:
1720 if (data->flags & NFS_MOUNT_VER3) {
1721 dprintk("%s: mount structure version %d does not support NFSv3\n",
1722 __FUNCTION__,
1723 data->version);
1724 goto out_err;
1725 }
1726 data->root.size = NFS2_FHSIZE;
1727 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1728 case 4:
1729 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1730 dprintk("%s: mount structure version %d does not support strong security\n",
1731 __FUNCTION__,
1732 data->version);
1733 goto out_err;
1734 }
1735 case 5:
1736 memset(data->context, 0, sizeof(data->context));
1737 }
1738 #ifndef CONFIG_NFS_V3
1739 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1740 s = ERR_PTR(-EPROTONOSUPPORT);
1741 if (data->flags & NFS_MOUNT_VER3) {
1742 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1743 goto out_err;
1744 }
1745 #endif /* CONFIG_NFS_V3 */
1746
1747 s = ERR_PTR(-ENOMEM);
1748 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1749 if (!server)
1750 goto out_err;
1751 /* Zero out the NFS state stuff */
1752 init_nfsv4_state(server);
1753 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1754
1755 root = &server->fh;
1756 if (data->flags & NFS_MOUNT_VER3)
1757 root->size = data->root.size;
1758 else
1759 root->size = NFS2_FHSIZE;
1760 s = ERR_PTR(-EINVAL);
1761 if (root->size > sizeof(root->data)) {
1762 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1763 goto out_err;
1764 }
1765 memcpy(root->data, data->root.data, root->size);
1766
1767 /* We now require that the mount process passes the remote address */
1768 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1769 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1770 dprintk("%s: mount program didn't pass remote address!\n",
1771 __FUNCTION__);
1772 goto out_err;
1773 }
1774
1775 /* Fire up rpciod if not yet running */
1776 s = ERR_PTR(rpciod_up());
1777 if (IS_ERR(s)) {
1778 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1779 __FUNCTION__, PTR_ERR(s));
1780 goto out_err;
1781 }
1782
1783 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1784 if (IS_ERR(s) || s->s_root)
1785 goto out_rpciod_down;
1786
1787 s->s_flags = flags;
1788
1789 error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1790 if (error) {
1791 up_write(&s->s_umount);
1792 deactivate_super(s);
1793 return ERR_PTR(error);
1794 }
1795 s->s_flags |= MS_ACTIVE;
1796 return s;
1797 out_rpciod_down:
1798 rpciod_down();
1799 out_err:
1800 kfree(server);
1801 return s;
1802 }
1803
1804 static void nfs_kill_super(struct super_block *s)
1805 {
1806 struct nfs_server *server = NFS_SB(s);
1807
1808 kill_anon_super(s);
1809
1810 if (!IS_ERR(server->client))
1811 rpc_shutdown_client(server->client);
1812 if (!IS_ERR(server->client_sys))
1813 rpc_shutdown_client(server->client_sys);
1814 if (!IS_ERR(server->client_acl))
1815 rpc_shutdown_client(server->client_acl);
1816
1817 if (!(server->flags & NFS_MOUNT_NONLM))
1818 lockd_down(); /* release rpc.lockd */
1819
1820 rpciod_down(); /* release rpciod */
1821
1822 nfs_free_iostats(server->io_stats);
1823 kfree(server->hostname);
1824 kfree(server);
1825 }
1826
1827 static struct file_system_type nfs_fs_type = {
1828 .owner = THIS_MODULE,
1829 .name = "nfs",
1830 .get_sb = nfs_get_sb,
1831 .kill_sb = nfs_kill_super,
1832 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1833 };
1834
1835 #ifdef CONFIG_NFS_V4
1836
1837 static void nfs4_clear_inode(struct inode *);
1838
1839
1840 static struct super_operations nfs4_sops = {
1841 .alloc_inode = nfs_alloc_inode,
1842 .destroy_inode = nfs_destroy_inode,
1843 .write_inode = nfs_write_inode,
1844 .delete_inode = nfs_delete_inode,
1845 .statfs = nfs_statfs,
1846 .clear_inode = nfs4_clear_inode,
1847 .umount_begin = nfs_umount_begin,
1848 .show_options = nfs_show_options,
1849 .show_stats = nfs_show_stats,
1850 };
1851
1852 /*
1853 * Clean out any remaining NFSv4 state that might be left over due
1854 * to open() calls that passed nfs_atomic_lookup, but failed to call
1855 * nfs_open().
1856 */
1857 static void nfs4_clear_inode(struct inode *inode)
1858 {
1859 struct nfs_inode *nfsi = NFS_I(inode);
1860
1861 /* If we are holding a delegation, return it! */
1862 nfs_inode_return_delegation(inode);
1863 /* First call standard NFS clear_inode() code */
1864 nfs_clear_inode(inode);
1865 /* Now clear out any remaining state */
1866 while (!list_empty(&nfsi->open_states)) {
1867 struct nfs4_state *state;
1868
1869 state = list_entry(nfsi->open_states.next,
1870 struct nfs4_state,
1871 inode_states);
1872 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1873 __FUNCTION__,
1874 inode->i_sb->s_id,
1875 (long long)NFS_FILEID(inode),
1876 state);
1877 BUG_ON(atomic_read(&state->count) != 1);
1878 nfs4_close_state(state, state->state);
1879 }
1880 }
1881
1882
1883 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1884 {
1885 struct nfs_server *server;
1886 struct nfs4_client *clp = NULL;
1887 struct rpc_xprt *xprt = NULL;
1888 struct rpc_clnt *clnt = NULL;
1889 struct rpc_timeout timeparms;
1890 rpc_authflavor_t authflavour;
1891 int err = -EIO;
1892
1893 sb->s_blocksize_bits = 0;
1894 sb->s_blocksize = 0;
1895 server = NFS_SB(sb);
1896 if (data->rsize != 0)
1897 server->rsize = nfs_block_size(data->rsize, NULL);
1898 if (data->wsize != 0)
1899 server->wsize = nfs_block_size(data->wsize, NULL);
1900 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1901 server->caps = NFS_CAP_ATOMIC_OPEN;
1902
1903 server->acregmin = data->acregmin*HZ;
1904 server->acregmax = data->acregmax*HZ;
1905 server->acdirmin = data->acdirmin*HZ;
1906 server->acdirmax = data->acdirmax*HZ;
1907
1908 server->rpc_ops = &nfs_v4_clientops;
1909
1910 nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1911
1912 server->retrans_timeo = timeparms.to_initval;
1913 server->retrans_count = timeparms.to_retries;
1914
1915 clp = nfs4_get_client(&server->addr.sin_addr);
1916 if (!clp) {
1917 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1918 return -EIO;
1919 }
1920
1921 /* Now create transport and client */
1922 authflavour = RPC_AUTH_UNIX;
1923 if (data->auth_flavourlen != 0) {
1924 if (data->auth_flavourlen != 1) {
1925 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1926 __FUNCTION__, data->auth_flavourlen);
1927 err = -EINVAL;
1928 goto out_fail;
1929 }
1930 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1931 err = -EFAULT;
1932 goto out_fail;
1933 }
1934 }
1935
1936 down_write(&clp->cl_sem);
1937 if (IS_ERR(clp->cl_rpcclient)) {
1938 xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
1939 if (IS_ERR(xprt)) {
1940 up_write(&clp->cl_sem);
1941 err = PTR_ERR(xprt);
1942 dprintk("%s: cannot create RPC transport. Error = %d\n",
1943 __FUNCTION__, err);
1944 goto out_fail;
1945 }
1946 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1947 server->rpc_ops->version, authflavour);
1948 if (IS_ERR(clnt)) {
1949 up_write(&clp->cl_sem);
1950 err = PTR_ERR(clnt);
1951 dprintk("%s: cannot create RPC client. Error = %d\n",
1952 __FUNCTION__, err);
1953 goto out_fail;
1954 }
1955 clnt->cl_intr = 1;
1956 clnt->cl_softrtry = 1;
1957 clp->cl_rpcclient = clnt;
1958 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1959 nfs_idmap_new(clp);
1960 }
1961 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1962 clnt = rpc_clone_client(clp->cl_rpcclient);
1963 if (!IS_ERR(clnt))
1964 server->nfs4_state = clp;
1965 up_write(&clp->cl_sem);
1966 clp = NULL;
1967
1968 if (IS_ERR(clnt)) {
1969 err = PTR_ERR(clnt);
1970 dprintk("%s: cannot create RPC client. Error = %d\n",
1971 __FUNCTION__, err);
1972 return err;
1973 }
1974
1975 server->client = clnt;
1976
1977 if (server->nfs4_state->cl_idmap == NULL) {
1978 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1979 return -ENOMEM;
1980 }
1981
1982 if (clnt->cl_auth->au_flavor != authflavour) {
1983 struct rpc_auth *auth;
1984
1985 auth = rpcauth_create(authflavour, clnt);
1986 if (IS_ERR(auth)) {
1987 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1988 return PTR_ERR(auth);
1989 }
1990 }
1991
1992 sb->s_time_gran = 1;
1993
1994 sb->s_op = &nfs4_sops;
1995 err = nfs_sb_init(sb, authflavour);
1996 if (err == 0)
1997 return 0;
1998 out_fail:
1999 if (clp)
2000 nfs4_put_client(clp);
2001 return err;
2002 }
2003
2004 static int nfs4_compare_super(struct super_block *sb, void *data)
2005 {
2006 struct nfs_server *server = data;
2007 struct nfs_server *old = NFS_SB(sb);
2008
2009 if (strcmp(server->hostname, old->hostname) != 0)
2010 return 0;
2011 if (strcmp(server->mnt_path, old->mnt_path) != 0)
2012 return 0;
2013 return 1;
2014 }
2015
2016 static void *
2017 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
2018 {
2019 void *p = NULL;
2020
2021 if (!src->len)
2022 return ERR_PTR(-EINVAL);
2023 if (src->len < maxlen)
2024 maxlen = src->len;
2025 if (dst == NULL) {
2026 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
2027 if (p == NULL)
2028 return ERR_PTR(-ENOMEM);
2029 }
2030 if (copy_from_user(dst, src->data, maxlen)) {
2031 kfree(p);
2032 return ERR_PTR(-EFAULT);
2033 }
2034 dst[maxlen] = '\0';
2035 return dst;
2036 }
2037
2038 static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
2039 int flags, const char *dev_name, void *raw_data)
2040 {
2041 int error;
2042 struct nfs_server *server;
2043 struct super_block *s;
2044 struct nfs4_mount_data *data = raw_data;
2045 void *p;
2046
2047 if (data == NULL) {
2048 dprintk("%s: missing data argument\n", __FUNCTION__);
2049 return ERR_PTR(-EINVAL);
2050 }
2051 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
2052 dprintk("%s: bad mount version\n", __FUNCTION__);
2053 return ERR_PTR(-EINVAL);
2054 }
2055
2056 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
2057 if (!server)
2058 return ERR_PTR(-ENOMEM);
2059 /* Zero out the NFS state stuff */
2060 init_nfsv4_state(server);
2061 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
2062
2063 p = nfs_copy_user_string(NULL, &data->hostname, 256);
2064 if (IS_ERR(p))
2065 goto out_err;
2066 server->hostname = p;
2067
2068 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
2069 if (IS_ERR(p))
2070 goto out_err;
2071 server->mnt_path = p;
2072
2073 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
2074 sizeof(server->ip_addr) - 1);
2075 if (IS_ERR(p))
2076 goto out_err;
2077
2078 /* We now require that the mount process passes the remote address */
2079 if (data->host_addrlen != sizeof(server->addr)) {
2080 s = ERR_PTR(-EINVAL);
2081 goto out_free;
2082 }
2083 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
2084 s = ERR_PTR(-EFAULT);
2085 goto out_free;
2086 }
2087 if (server->addr.sin_family != AF_INET ||
2088 server->addr.sin_addr.s_addr == INADDR_ANY) {
2089 dprintk("%s: mount program didn't pass remote IP address!\n",
2090 __FUNCTION__);
2091 s = ERR_PTR(-EINVAL);
2092 goto out_free;
2093 }
2094
2095 /* Fire up rpciod if not yet running */
2096 s = ERR_PTR(rpciod_up());
2097 if (IS_ERR(s)) {
2098 dprintk("%s: couldn't start rpciod! Error = %ld\n",
2099 __FUNCTION__, PTR_ERR(s));
2100 goto out_free;
2101 }
2102
2103 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
2104
2105 if (IS_ERR(s) || s->s_root)
2106 goto out_free;
2107
2108 s->s_flags = flags;
2109
2110 error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
2111 if (error) {
2112 up_write(&s->s_umount);
2113 deactivate_super(s);
2114 return ERR_PTR(error);
2115 }
2116 s->s_flags |= MS_ACTIVE;
2117 return s;
2118 out_err:
2119 s = (struct super_block *)p;
2120 out_free:
2121 kfree(server->mnt_path);
2122 kfree(server->hostname);
2123 kfree(server);
2124 return s;
2125 }
2126
2127 static void nfs4_kill_super(struct super_block *sb)
2128 {
2129 struct nfs_server *server = NFS_SB(sb);
2130
2131 nfs_return_all_delegations(sb);
2132 kill_anon_super(sb);
2133
2134 nfs4_renewd_prepare_shutdown(server);
2135
2136 if (server->client != NULL && !IS_ERR(server->client))
2137 rpc_shutdown_client(server->client);
2138
2139 destroy_nfsv4_state(server);
2140
2141 rpciod_down();
2142
2143 nfs_free_iostats(server->io_stats);
2144 kfree(server->hostname);
2145 kfree(server);
2146 }
2147
2148 static struct file_system_type nfs4_fs_type = {
2149 .owner = THIS_MODULE,
2150 .name = "nfs4",
2151 .get_sb = nfs4_get_sb,
2152 .kill_sb = nfs4_kill_super,
2153 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
2154 };
2155
2156 static const int nfs_set_port_min = 0;
2157 static const int nfs_set_port_max = 65535;
2158 static int param_set_port(const char *val, struct kernel_param *kp)
2159 {
2160 char *endp;
2161 int num = simple_strtol(val, &endp, 0);
2162 if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
2163 return -EINVAL;
2164 *((int *)kp->arg) = num;
2165 return 0;
2166 }
2167
2168 module_param_call(callback_tcpport, param_set_port, param_get_int,
2169 &nfs_callback_set_tcpport, 0644);
2170
2171 static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
2172 {
2173 char *endp;
2174 int num = simple_strtol(val, &endp, 0);
2175 int jif = num * HZ;
2176 if (endp == val || *endp || num < 0 || jif < num)
2177 return -EINVAL;
2178 *((int *)kp->arg) = jif;
2179 return 0;
2180 }
2181
2182 module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
2183 &nfs_idmap_cache_timeout, 0644);
2184
2185 #define nfs4_init_once(nfsi) \
2186 do { \
2187 INIT_LIST_HEAD(&(nfsi)->open_states); \
2188 nfsi->delegation = NULL; \
2189 nfsi->delegation_state = 0; \
2190 init_rwsem(&nfsi->rwsem); \
2191 } while(0)
2192
2193 static inline int register_nfs4fs(void)
2194 {
2195 int ret;
2196
2197 ret = nfs_register_sysctl();
2198 if (ret != 0)
2199 return ret;
2200 ret = register_filesystem(&nfs4_fs_type);
2201 if (ret != 0)
2202 nfs_unregister_sysctl();
2203 return ret;
2204 }
2205
2206 static inline void unregister_nfs4fs(void)
2207 {
2208 unregister_filesystem(&nfs4_fs_type);
2209 nfs_unregister_sysctl();
2210 }
2211 #else
2212 #define nfs4_init_once(nfsi) \
2213 do { } while (0)
2214 #define register_nfs4fs() (0)
2215 #define unregister_nfs4fs()
2216 #endif
2217
2218 extern int nfs_init_nfspagecache(void);
2219 extern void nfs_destroy_nfspagecache(void);
2220 extern int nfs_init_readpagecache(void);
2221 extern void nfs_destroy_readpagecache(void);
2222 extern int nfs_init_writepagecache(void);
2223 extern void nfs_destroy_writepagecache(void);
2224 #ifdef CONFIG_NFS_DIRECTIO
2225 extern int nfs_init_directcache(void);
2226 extern void nfs_destroy_directcache(void);
2227 #endif
2228
2229 static kmem_cache_t * nfs_inode_cachep;
2230
2231 static struct inode *nfs_alloc_inode(struct super_block *sb)
2232 {
2233 struct nfs_inode *nfsi;
2234 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
2235 if (!nfsi)
2236 return NULL;
2237 nfsi->flags = 0UL;
2238 nfsi->cache_validity = 0UL;
2239 nfsi->cache_change_attribute = jiffies;
2240 #ifdef CONFIG_NFS_V3_ACL
2241 nfsi->acl_access = ERR_PTR(-EAGAIN);
2242 nfsi->acl_default = ERR_PTR(-EAGAIN);
2243 #endif
2244 #ifdef CONFIG_NFS_V4
2245 nfsi->nfs4_acl = NULL;
2246 #endif /* CONFIG_NFS_V4 */
2247 return &nfsi->vfs_inode;
2248 }
2249
2250 static void nfs_destroy_inode(struct inode *inode)
2251 {
2252 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2253 }
2254
2255 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
2256 {
2257 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2258
2259 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2260 SLAB_CTOR_CONSTRUCTOR) {
2261 inode_init_once(&nfsi->vfs_inode);
2262 spin_lock_init(&nfsi->req_lock);
2263 INIT_LIST_HEAD(&nfsi->dirty);
2264 INIT_LIST_HEAD(&nfsi->commit);
2265 INIT_LIST_HEAD(&nfsi->open_files);
2266 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
2267 atomic_set(&nfsi->data_updates, 0);
2268 nfsi->ndirty = 0;
2269 nfsi->ncommit = 0;
2270 nfsi->npages = 0;
2271 nfs4_init_once(nfsi);
2272 }
2273 }
2274
2275 static int nfs_init_inodecache(void)
2276 {
2277 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2278 sizeof(struct nfs_inode),
2279 0, (SLAB_RECLAIM_ACCOUNT|
2280 SLAB_MEM_SPREAD),
2281 init_once, NULL);
2282 if (nfs_inode_cachep == NULL)
2283 return -ENOMEM;
2284
2285 return 0;
2286 }
2287
2288 static void nfs_destroy_inodecache(void)
2289 {
2290 if (kmem_cache_destroy(nfs_inode_cachep))
2291 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
2292 }
2293
2294 /*
2295 * Initialize NFS
2296 */
2297 static int __init init_nfs_fs(void)
2298 {
2299 int err;
2300
2301 err = nfs_init_nfspagecache();
2302 if (err)
2303 goto out4;
2304
2305 err = nfs_init_inodecache();
2306 if (err)
2307 goto out3;
2308
2309 err = nfs_init_readpagecache();
2310 if (err)
2311 goto out2;
2312
2313 err = nfs_init_writepagecache();
2314 if (err)
2315 goto out1;
2316
2317 #ifdef CONFIG_NFS_DIRECTIO
2318 err = nfs_init_directcache();
2319 if (err)
2320 goto out0;
2321 #endif
2322
2323 #ifdef CONFIG_PROC_FS
2324 rpc_proc_register(&nfs_rpcstat);
2325 #endif
2326 err = register_filesystem(&nfs_fs_type);
2327 if (err)
2328 goto out;
2329 if ((err = register_nfs4fs()) != 0)
2330 goto out;
2331 return 0;
2332 out:
2333 #ifdef CONFIG_PROC_FS
2334 rpc_proc_unregister("nfs");
2335 #endif
2336 #ifdef CONFIG_NFS_DIRECTIO
2337 nfs_destroy_directcache();
2338 out0:
2339 #endif
2340 nfs_destroy_writepagecache();
2341 out1:
2342 nfs_destroy_readpagecache();
2343 out2:
2344 nfs_destroy_inodecache();
2345 out3:
2346 nfs_destroy_nfspagecache();
2347 out4:
2348 return err;
2349 }
2350
2351 static void __exit exit_nfs_fs(void)
2352 {
2353 #ifdef CONFIG_NFS_DIRECTIO
2354 nfs_destroy_directcache();
2355 #endif
2356 nfs_destroy_writepagecache();
2357 nfs_destroy_readpagecache();
2358 nfs_destroy_inodecache();
2359 nfs_destroy_nfspagecache();
2360 #ifdef CONFIG_PROC_FS
2361 rpc_proc_unregister("nfs");
2362 #endif
2363 unregister_filesystem(&nfs_fs_type);
2364 unregister_nfs4fs();
2365 }
2366
2367 /* Not quite true; I just maintain it */
2368 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2369 MODULE_LICENSE("GPL");
2370
2371 module_init(init_nfs_fs)
2372 module_exit(exit_nfs_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree