?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
NFS: Clean up inode metadata updates
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / inode.c
blob4f12c57456f408ab387a6fb4aab0d067387b948e
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_each_possible_cpu(cpu) {
704 struct nfs_iostats *stats;
705
706 preempt_disable();
707 stats = per_cpu_ptr(nfss->io_stats, cpu);
708
709 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
710 totals.events[i] += stats->events[i];
711 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
712 totals.bytes[i] += stats->bytes[i];
713
714 preempt_enable();
715 }
716
717 seq_printf(m, "\n\tevents:\t");
718 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
719 seq_printf(m, "%lu ", totals.events[i]);
720 seq_printf(m, "\n\tbytes:\t");
721 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
722 seq_printf(m, "%Lu ", totals.bytes[i]);
723 seq_printf(m, "\n");
724
725 rpc_print_iostats(m, nfss->client);
726
727 return 0;
728 }
729
730 /**
731 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
732 */
733 int nfs_sync_mapping(struct address_space *mapping)
734 {
735 int ret;
736
737 if (mapping->nrpages == 0)
738 return 0;
739 unmap_mapping_range(mapping, 0, 0, 0);
740 ret = filemap_write_and_wait(mapping);
741 if (ret != 0)
742 goto out;
743 ret = nfs_wb_all(mapping->host);
744 out:
745 return ret;
746 }
747
748 /*
749 * Invalidate the local caches
750 */
751 static void nfs_zap_caches_locked(struct inode *inode)
752 {
753 struct nfs_inode *nfsi = NFS_I(inode);
754 int mode = inode->i_mode;
755
756 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
757
758 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
759 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
760
761 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
762 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
763 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
764 else
765 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
766 }
767
768 void nfs_zap_caches(struct inode *inode)
769 {
770 spin_lock(&inode->i_lock);
771 nfs_zap_caches_locked(inode);
772 spin_unlock(&inode->i_lock);
773 }
774
775 static void nfs_zap_acl_cache(struct inode *inode)
776 {
777 void (*clear_acl_cache)(struct inode *);
778
779 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
780 if (clear_acl_cache != NULL)
781 clear_acl_cache(inode);
782 spin_lock(&inode->i_lock);
783 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
784 spin_unlock(&inode->i_lock);
785 }
786
787 /*
788 * Invalidate, but do not unhash, the inode.
789 * NB: must be called with inode->i_lock held!
790 */
791 static void nfs_invalidate_inode(struct inode *inode)
792 {
793 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
794 nfs_zap_caches_locked(inode);
795 }
796
797 struct nfs_find_desc {
798 struct nfs_fh *fh;
799 struct nfs_fattr *fattr;
800 };
801
802 /*
803 * In NFSv3 we can have 64bit inode numbers. In order to support
804 * this, and re-exported directories (also seen in NFSv2)
805 * we are forced to allow 2 different inodes to have the same
806 * i_ino.
807 */
808 static int
809 nfs_find_actor(struct inode *inode, void *opaque)
810 {
811 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
812 struct nfs_fh *fh = desc->fh;
813 struct nfs_fattr *fattr = desc->fattr;
814
815 if (NFS_FILEID(inode) != fattr->fileid)
816 return 0;
817 if (nfs_compare_fh(NFS_FH(inode), fh))
818 return 0;
819 if (is_bad_inode(inode) || NFS_STALE(inode))
820 return 0;
821 return 1;
822 }
823
824 static int
825 nfs_init_locked(struct inode *inode, void *opaque)
826 {
827 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
828 struct nfs_fattr *fattr = desc->fattr;
829
830 NFS_FILEID(inode) = fattr->fileid;
831 nfs_copy_fh(NFS_FH(inode), desc->fh);
832 return 0;
833 }
834
835 /* Don't use READDIRPLUS on directories that we believe are too large */
836 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
837
838 /*
839 * This is our front-end to iget that looks up inodes by file handle
840 * instead of inode number.
841 */
842 struct inode *
843 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
844 {
845 struct nfs_find_desc desc = {
846 .fh = fh,
847 .fattr = fattr
848 };
849 struct inode *inode = ERR_PTR(-ENOENT);
850 unsigned long hash;
851
852 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
853 goto out_no_inode;
854
855 if (!fattr->nlink) {
856 printk("NFS: Buggy server - nlink == 0!\n");
857 goto out_no_inode;
858 }
859
860 hash = nfs_fattr_to_ino_t(fattr);
861
862 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
863 if (inode == NULL) {
864 inode = ERR_PTR(-ENOMEM);
865 goto out_no_inode;
866 }
867
868 if (inode->i_state & I_NEW) {
869 struct nfs_inode *nfsi = NFS_I(inode);
870
871 /* We set i_ino for the few things that still rely on it,
872 * such as stat(2) */
873 inode->i_ino = hash;
874
875 /* We can't support update_atime(), since the server will reset it */
876 inode->i_flags |= S_NOATIME|S_NOCMTIME;
877 inode->i_mode = fattr->mode;
878 /* Why so? Because we want revalidate for devices/FIFOs, and
879 * that's precisely what we have in nfs_file_inode_operations.
880 */
881 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
882 if (S_ISREG(inode->i_mode)) {
883 inode->i_fop = &nfs_file_operations;
884 inode->i_data.a_ops = &nfs_file_aops;
885 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
886 } else if (S_ISDIR(inode->i_mode)) {
887 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
888 inode->i_fop = &nfs_dir_operations;
889 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
890 && fattr->size <= NFS_LIMIT_READDIRPLUS)
891 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
892 } else if (S_ISLNK(inode->i_mode))
893 inode->i_op = &nfs_symlink_inode_operations;
894 else
895 init_special_inode(inode, inode->i_mode, fattr->rdev);
896
897 nfsi->read_cache_jiffies = fattr->time_start;
898 nfsi->last_updated = jiffies;
899 inode->i_atime = fattr->atime;
900 inode->i_mtime = fattr->mtime;
901 inode->i_ctime = fattr->ctime;
902 if (fattr->valid & NFS_ATTR_FATTR_V4)
903 nfsi->change_attr = fattr->change_attr;
904 inode->i_size = nfs_size_to_loff_t(fattr->size);
905 inode->i_nlink = fattr->nlink;
906 inode->i_uid = fattr->uid;
907 inode->i_gid = fattr->gid;
908 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
909 /*
910 * report the blocks in 512byte units
911 */
912 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
913 inode->i_blksize = inode->i_sb->s_blocksize;
914 } else {
915 inode->i_blocks = fattr->du.nfs2.blocks;
916 inode->i_blksize = fattr->du.nfs2.blocksize;
917 }
918 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
919 nfsi->attrtimeo_timestamp = jiffies;
920 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
921 nfsi->cache_access.cred = NULL;
922
923 unlock_new_inode(inode);
924 } else
925 nfs_refresh_inode(inode, fattr);
926 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
927 inode->i_sb->s_id,
928 (long long)NFS_FILEID(inode),
929 atomic_read(&inode->i_count));
930
931 out:
932 return inode;
933
934 out_no_inode:
935 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
936 goto out;
937 }
938
939 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
940
941 int
942 nfs_setattr(struct dentry *dentry, struct iattr *attr)
943 {
944 struct inode *inode = dentry->d_inode;
945 struct nfs_fattr fattr;
946 int error;
947
948 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
949
950 if (attr->ia_valid & ATTR_SIZE) {
951 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
952 attr->ia_valid &= ~ATTR_SIZE;
953 }
954
955 /* Optimization: if the end result is no change, don't RPC */
956 attr->ia_valid &= NFS_VALID_ATTRS;
957 if (attr->ia_valid == 0)
958 return 0;
959
960 lock_kernel();
961 nfs_begin_data_update(inode);
962 /* Write all dirty data */
963 filemap_write_and_wait(inode->i_mapping);
964 nfs_wb_all(inode);
965 /*
966 * Return any delegations if we're going to change ACLs
967 */
968 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
969 nfs_inode_return_delegation(inode);
970 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
971 if (error == 0)
972 nfs_refresh_inode(inode, &fattr);
973 nfs_end_data_update(inode);
974 unlock_kernel();
975 return error;
976 }
977
978 /**
979 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
980 * @inode: pointer to struct inode
981 * @attr: pointer to struct iattr
982 *
983 * Note: we do this in the *proc.c in order to ensure that
984 * it works for things like exclusive creates too.
985 */
986 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
987 {
988 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
989 if ((attr->ia_valid & ATTR_MODE) != 0) {
990 int mode = attr->ia_mode & S_IALLUGO;
991 mode |= inode->i_mode & ~S_IALLUGO;
992 inode->i_mode = mode;
993 }
994 if ((attr->ia_valid & ATTR_UID) != 0)
995 inode->i_uid = attr->ia_uid;
996 if ((attr->ia_valid & ATTR_GID) != 0)
997 inode->i_gid = attr->ia_gid;
998 spin_lock(&inode->i_lock);
999 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1000 spin_unlock(&inode->i_lock);
1001 }
1002 if ((attr->ia_valid & ATTR_SIZE) != 0) {
1003 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
1004 inode->i_size = attr->ia_size;
1005 vmtruncate(inode, attr->ia_size);
1006 }
1007 }
1008
1009 static int nfs_wait_schedule(void *word)
1010 {
1011 if (signal_pending(current))
1012 return -ERESTARTSYS;
1013 schedule();
1014 return 0;
1015 }
1016
1017 /*
1018 * Wait for the inode to get unlocked.
1019 */
1020 static int nfs_wait_on_inode(struct inode *inode)
1021 {
1022 struct rpc_clnt *clnt = NFS_CLIENT(inode);
1023 struct nfs_inode *nfsi = NFS_I(inode);
1024 sigset_t oldmask;
1025 int error;
1026
1027 rpc_clnt_sigmask(clnt, &oldmask);
1028 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
1029 nfs_wait_schedule, TASK_INTERRUPTIBLE);
1030 rpc_clnt_sigunmask(clnt, &oldmask);
1031
1032 return error;
1033 }
1034
1035 static void nfs_wake_up_inode(struct inode *inode)
1036 {
1037 struct nfs_inode *nfsi = NFS_I(inode);
1038
1039 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
1040 smp_mb__after_clear_bit();
1041 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
1042 }
1043
1044 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1045 {
1046 struct inode *inode = dentry->d_inode;
1047 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
1048 int err;
1049
1050 /* Flush out writes to the server in order to update c/mtime */
1051 nfs_sync_inode_wait(inode, 0, 0, FLUSH_NOCOMMIT);
1052
1053 /*
1054 * We may force a getattr if the user cares about atime.
1055 *
1056 * Note that we only have to check the vfsmount flags here:
1057 * - NFS always sets S_NOATIME by so checking it would give a
1058 * bogus result
1059 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
1060 * no point in checking those.
1061 */
1062 if ((mnt->mnt_flags & MNT_NOATIME) ||
1063 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1064 need_atime = 0;
1065
1066 if (need_atime)
1067 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1068 else
1069 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
1070 if (!err)
1071 generic_fillattr(inode, stat);
1072 return err;
1073 }
1074
1075 static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
1076 {
1077 struct nfs_open_context *ctx;
1078
1079 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
1080 if (ctx != NULL) {
1081 atomic_set(&ctx->count, 1);
1082 ctx->dentry = dget(dentry);
1083 ctx->vfsmnt = mntget(mnt);
1084 ctx->cred = get_rpccred(cred);
1085 ctx->state = NULL;
1086 ctx->lockowner = current->files;
1087 ctx->error = 0;
1088 ctx->dir_cookie = 0;
1089 }
1090 return ctx;
1091 }
1092
1093 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1094 {
1095 if (ctx != NULL)
1096 atomic_inc(&ctx->count);
1097 return ctx;
1098 }
1099
1100 void put_nfs_open_context(struct nfs_open_context *ctx)
1101 {
1102 if (atomic_dec_and_test(&ctx->count)) {
1103 if (!list_empty(&ctx->list)) {
1104 struct inode *inode = ctx->dentry->d_inode;
1105 spin_lock(&inode->i_lock);
1106 list_del(&ctx->list);
1107 spin_unlock(&inode->i_lock);
1108 }
1109 if (ctx->state != NULL)
1110 nfs4_close_state(ctx->state, ctx->mode);
1111 if (ctx->cred != NULL)
1112 put_rpccred(ctx->cred);
1113 dput(ctx->dentry);
1114 mntput(ctx->vfsmnt);
1115 kfree(ctx);
1116 }
1117 }
1118
1119 /*
1120 * Ensure that mmap has a recent RPC credential for use when writing out
1121 * shared pages
1122 */
1123 static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1124 {
1125 struct inode *inode = filp->f_dentry->d_inode;
1126 struct nfs_inode *nfsi = NFS_I(inode);
1127
1128 filp->private_data = get_nfs_open_context(ctx);
1129 spin_lock(&inode->i_lock);
1130 list_add(&ctx->list, &nfsi->open_files);
1131 spin_unlock(&inode->i_lock);
1132 }
1133
1134 /*
1135 * Given an inode, search for an open context with the desired characteristics
1136 */
1137 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
1138 {
1139 struct nfs_inode *nfsi = NFS_I(inode);
1140 struct nfs_open_context *pos, *ctx = NULL;
1141
1142 spin_lock(&inode->i_lock);
1143 list_for_each_entry(pos, &nfsi->open_files, list) {
1144 if (cred != NULL && pos->cred != cred)
1145 continue;
1146 if ((pos->mode & mode) == mode) {
1147 ctx = get_nfs_open_context(pos);
1148 break;
1149 }
1150 }
1151 spin_unlock(&inode->i_lock);
1152 return ctx;
1153 }
1154
1155 static void nfs_file_clear_open_context(struct file *filp)
1156 {
1157 struct inode *inode = filp->f_dentry->d_inode;
1158 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
1159
1160 if (ctx) {
1161 filp->private_data = NULL;
1162 spin_lock(&inode->i_lock);
1163 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1164 spin_unlock(&inode->i_lock);
1165 put_nfs_open_context(ctx);
1166 }
1167 }
1168
1169 /*
1170 * These allocate and release file read/write context information.
1171 */
1172 int nfs_open(struct inode *inode, struct file *filp)
1173 {
1174 struct nfs_open_context *ctx;
1175 struct rpc_cred *cred;
1176
1177 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1178 if (IS_ERR(cred))
1179 return PTR_ERR(cred);
1180 ctx = alloc_nfs_open_context(filp->f_vfsmnt, filp->f_dentry, cred);
1181 put_rpccred(cred);
1182 if (ctx == NULL)
1183 return -ENOMEM;
1184 ctx->mode = filp->f_mode;
1185 nfs_file_set_open_context(filp, ctx);
1186 put_nfs_open_context(ctx);
1187 return 0;
1188 }
1189
1190 int nfs_release(struct inode *inode, struct file *filp)
1191 {
1192 nfs_file_clear_open_context(filp);
1193 return 0;
1194 }
1195
1196 /*
1197 * This function is called whenever some part of NFS notices that
1198 * the cached attributes have to be refreshed.
1199 */
1200 int
1201 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1202 {
1203 int status = -ESTALE;
1204 struct nfs_fattr fattr;
1205 struct nfs_inode *nfsi = NFS_I(inode);
1206
1207 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1208 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1209
1210 lock_kernel();
1211 if (!inode || is_bad_inode(inode))
1212 goto out_nowait;
1213 if (NFS_STALE(inode))
1214 goto out_nowait;
1215
1216 status = nfs_wait_on_inode(inode);
1217 if (status < 0)
1218 goto out;
1219 if (NFS_STALE(inode)) {
1220 status = -ESTALE;
1221 /* Do we trust the cached ESTALE? */
1222 if (NFS_ATTRTIMEO(inode) != 0) {
1223 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
1224 /* no */
1225 } else
1226 goto out;
1227 }
1228 }
1229
1230 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1231 if (status != 0) {
1232 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1233 inode->i_sb->s_id,
1234 (long long)NFS_FILEID(inode), status);
1235 if (status == -ESTALE) {
1236 nfs_zap_caches(inode);
1237 if (!S_ISDIR(inode->i_mode))
1238 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1239 }
1240 goto out;
1241 }
1242
1243 spin_lock(&inode->i_lock);
1244 status = nfs_update_inode(inode, &fattr);
1245 if (status) {
1246 spin_unlock(&inode->i_lock);
1247 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1248 inode->i_sb->s_id,
1249 (long long)NFS_FILEID(inode), status);
1250 goto out;
1251 }
1252 spin_unlock(&inode->i_lock);
1253
1254 nfs_revalidate_mapping(inode, inode->i_mapping);
1255
1256 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1257 nfs_zap_acl_cache(inode);
1258
1259 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1260 inode->i_sb->s_id,
1261 (long long)NFS_FILEID(inode));
1262
1263 out:
1264 nfs_wake_up_inode(inode);
1265
1266 out_nowait:
1267 unlock_kernel();
1268 return status;
1269 }
1270
1271 int nfs_attribute_timeout(struct inode *inode)
1272 {
1273 struct nfs_inode *nfsi = NFS_I(inode);
1274
1275 if (nfs_have_delegation(inode, FMODE_READ))
1276 return 0;
1277 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1278 }
1279
1280 /**
1281 * nfs_revalidate_inode - Revalidate the inode attributes
1282 * @server - pointer to nfs_server struct
1283 * @inode - pointer to inode struct
1284 *
1285 * Updates inode attribute information by retrieving the data from the server.
1286 */
1287 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1288 {
1289 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1290 if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1291 && !nfs_attribute_timeout(inode))
1292 return NFS_STALE(inode) ? -ESTALE : 0;
1293 return __nfs_revalidate_inode(server, inode);
1294 }
1295
1296 /**
1297 * nfs_revalidate_mapping - Revalidate the pagecache
1298 * @inode - pointer to host inode
1299 * @mapping - pointer to mapping
1300 */
1301 void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1302 {
1303 struct nfs_inode *nfsi = NFS_I(inode);
1304
1305 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
1306 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1307 if (S_ISREG(inode->i_mode))
1308 nfs_sync_mapping(mapping);
1309 invalidate_inode_pages2(mapping);
1310
1311 spin_lock(&inode->i_lock);
1312 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1313 if (S_ISDIR(inode->i_mode)) {
1314 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1315 /* This ensures we revalidate child dentries */
1316 nfsi->cache_change_attribute = jiffies;
1317 }
1318 spin_unlock(&inode->i_lock);
1319
1320 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1321 inode->i_sb->s_id,
1322 (long long)NFS_FILEID(inode));
1323 }
1324 }
1325
1326 /**
1327 * nfs_begin_data_update
1328 * @inode - pointer to inode
1329 * Declare that a set of operations will update file data on the server
1330 */
1331 void nfs_begin_data_update(struct inode *inode)
1332 {
1333 atomic_inc(&NFS_I(inode)->data_updates);
1334 }
1335
1336 /**
1337 * nfs_end_data_update
1338 * @inode - pointer to inode
1339 * Declare end of the operations that will update file data
1340 * This will mark the inode as immediately needing revalidation
1341 * of its attribute cache.
1342 */
1343 void nfs_end_data_update(struct inode *inode)
1344 {
1345 struct nfs_inode *nfsi = NFS_I(inode);
1346
1347 if (!nfs_have_delegation(inode, FMODE_READ)) {
1348 /* Directories and symlinks: invalidate page cache */
1349 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
1350 spin_lock(&inode->i_lock);
1351 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1352 spin_unlock(&inode->i_lock);
1353 }
1354 }
1355 nfsi->cache_change_attribute = jiffies;
1356 atomic_dec(&nfsi->data_updates);
1357 }
1358
1359 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1360 {
1361 struct nfs_inode *nfsi = NFS_I(inode);
1362
1363 /* If we have atomic WCC data, we may update some attributes */
1364 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1365 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1366 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1367 nfsi->cache_change_attribute = jiffies;
1368 }
1369 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1370 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1371 nfsi->cache_change_attribute = jiffies;
1372 }
1373 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
1374 inode->i_size = fattr->size;
1375 nfsi->cache_change_attribute = jiffies;
1376 }
1377 }
1378 }
1379
1380 /**
1381 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1382 * @inode - pointer to inode
1383 * @fattr - updated attributes
1384 *
1385 * Verifies the attribute cache. If we have just changed the attributes,
1386 * so that fattr carries weak cache consistency data, then it may
1387 * also update the ctime/mtime/change_attribute.
1388 */
1389 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1390 {
1391 struct nfs_inode *nfsi = NFS_I(inode);
1392 loff_t cur_size, new_isize;
1393 int data_unstable;
1394
1395
1396 /* Has the inode gone and changed behind our back? */
1397 if (nfsi->fileid != fattr->fileid
1398 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1399 return -EIO;
1400 }
1401
1402 /* Are we in the process of updating data on the server? */
1403 data_unstable = nfs_caches_unstable(inode);
1404
1405 /* Do atomic weak cache consistency updates */
1406 nfs_wcc_update_inode(inode, fattr);
1407
1408 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
1409 nfsi->change_attr != fattr->change_attr) {
1410 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1411 if (!data_unstable)
1412 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1413 }
1414
1415 /* Verify a few of the more important attributes */
1416 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1417 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1418 if (!data_unstable)
1419 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1420 }
1421
1422 cur_size = i_size_read(inode);
1423 new_isize = nfs_size_to_loff_t(fattr->size);
1424 if (cur_size != new_isize && nfsi->npages == 0)
1425 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1426
1427 /* Have any file permissions changed? */
1428 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1429 || inode->i_uid != fattr->uid
1430 || inode->i_gid != fattr->gid)
1431 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1432
1433 /* Has the link count changed? */
1434 if (inode->i_nlink != fattr->nlink)
1435 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1436
1437 if (!timespec_equal(&inode->i_atime, &fattr->atime))
1438 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
1439
1440 nfsi->read_cache_jiffies = fattr->time_start;
1441 return 0;
1442 }
1443
1444 /**
1445 * nfs_refresh_inode - try to update the inode attribute cache
1446 * @inode - pointer to inode
1447 * @fattr - updated attributes
1448 *
1449 * Check that an RPC call that returned attributes has not overlapped with
1450 * other recent updates of the inode metadata, then decide whether it is
1451 * safe to do a full update of the inode attributes, or whether just to
1452 * call nfs_check_inode_attributes.
1453 */
1454 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1455 {
1456 struct nfs_inode *nfsi = NFS_I(inode);
1457 int status;
1458
1459 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1460 return 0;
1461 spin_lock(&inode->i_lock);
1462 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1463 if (time_after(fattr->time_start, nfsi->last_updated))
1464 status = nfs_update_inode(inode, fattr);
1465 else
1466 status = nfs_check_inode_attributes(inode, fattr);
1467
1468 spin_unlock(&inode->i_lock);
1469 return status;
1470 }
1471
1472 /**
1473 * nfs_post_op_update_inode - try to update the inode attribute cache
1474 * @inode - pointer to inode
1475 * @fattr - updated attributes
1476 *
1477 * After an operation that has changed the inode metadata, mark the
1478 * attribute cache as being invalid, then try to update it.
1479 */
1480 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1481 {
1482 struct nfs_inode *nfsi = NFS_I(inode);
1483 int status = 0;
1484
1485 spin_lock(&inode->i_lock);
1486 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
1487 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
1488 goto out;
1489 }
1490 status = nfs_update_inode(inode, fattr);
1491 out:
1492 spin_unlock(&inode->i_lock);
1493 return status;
1494 }
1495
1496 /*
1497 * Many nfs protocol calls return the new file attributes after
1498 * an operation. Here we update the inode to reflect the state
1499 * of the server's inode.
1500 *
1501 * This is a bit tricky because we have to make sure all dirty pages
1502 * have been sent off to the server before calling invalidate_inode_pages.
1503 * To make sure no other process adds more write requests while we try
1504 * our best to flush them, we make them sleep during the attribute refresh.
1505 *
1506 * A very similar scenario holds for the dir cache.
1507 */
1508 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1509 {
1510 struct nfs_inode *nfsi = NFS_I(inode);
1511 loff_t cur_isize, new_isize;
1512 unsigned int invalid = 0;
1513 int data_stable;
1514
1515 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1516 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1517 atomic_read(&inode->i_count), fattr->valid);
1518
1519 if (nfsi->fileid != fattr->fileid)
1520 goto out_fileid;
1521
1522 /*
1523 * Make sure the inode's type hasn't changed.
1524 */
1525 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1526 goto out_changed;
1527
1528 /*
1529 * Update the read time so we don't revalidate too often.
1530 */
1531 nfsi->read_cache_jiffies = fattr->time_start;
1532 nfsi->last_updated = jiffies;
1533
1534 /* Are we racing with known updates of the metadata on the server? */
1535 data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
1536 if (data_stable)
1537 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1538
1539 /* Do atomic weak cache consistency updates */
1540 nfs_wcc_update_inode(inode, fattr);
1541
1542 /* Check if our cached file size is stale */
1543 new_isize = nfs_size_to_loff_t(fattr->size);
1544 cur_isize = i_size_read(inode);
1545 if (new_isize != cur_isize) {
1546 /* Do we perhaps have any outstanding writes? */
1547 if (nfsi->npages == 0) {
1548 /* No, but did we race with nfs_end_data_update()? */
1549 if (data_stable) {
1550 inode->i_size = new_isize;
1551 invalid |= NFS_INO_INVALID_DATA;
1552 }
1553 invalid |= NFS_INO_INVALID_ATTR;
1554 } else if (new_isize > cur_isize) {
1555 inode->i_size = new_isize;
1556 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1557 }
1558 nfsi->cache_change_attribute = jiffies;
1559 dprintk("NFS: isize change on server for file %s/%ld\n",
1560 inode->i_sb->s_id, inode->i_ino);
1561 }
1562
1563 /* Check if the mtime agrees */
1564 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1565 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1566 dprintk("NFS: mtime change on server for file %s/%ld\n",
1567 inode->i_sb->s_id, inode->i_ino);
1568 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1569 nfsi->cache_change_attribute = jiffies;
1570 }
1571
1572 /* If ctime has changed we should definitely clear access+acl caches */
1573 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1574 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1575 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1576 nfsi->cache_change_attribute = jiffies;
1577 }
1578 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1579
1580 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1581 inode->i_uid != fattr->uid ||
1582 inode->i_gid != fattr->gid)
1583 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1584
1585 inode->i_mode = fattr->mode;
1586 inode->i_nlink = fattr->nlink;
1587 inode->i_uid = fattr->uid;
1588 inode->i_gid = fattr->gid;
1589
1590 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1591 /*
1592 * report the blocks in 512byte units
1593 */
1594 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1595 inode->i_blksize = inode->i_sb->s_blocksize;
1596 } else {
1597 inode->i_blocks = fattr->du.nfs2.blocks;
1598 inode->i_blksize = fattr->du.nfs2.blocksize;
1599 }
1600
1601 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
1602 nfsi->change_attr != fattr->change_attr) {
1603 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1604 inode->i_sb->s_id, inode->i_ino);
1605 nfsi->change_attr = fattr->change_attr;
1606 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1607 nfsi->cache_change_attribute = jiffies;
1608 }
1609
1610 /* Update attrtimeo value if we're out of the unstable period */
1611 if (invalid & NFS_INO_INVALID_ATTR) {
1612 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1613 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1614 nfsi->attrtimeo_timestamp = jiffies;
1615 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1616 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1617 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1618 nfsi->attrtimeo_timestamp = jiffies;
1619 }
1620 /* Don't invalidate the data if we were to blame */
1621 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1622 || S_ISLNK(inode->i_mode)))
1623 invalid &= ~NFS_INO_INVALID_DATA;
1624 if (data_stable)
1625 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
1626 if (!nfs_have_delegation(inode, FMODE_READ))
1627 nfsi->cache_validity |= invalid;
1628
1629 return 0;
1630 out_changed:
1631 /*
1632 * Big trouble! The inode has become a different object.
1633 */
1634 #ifdef NFS_PARANOIA
1635 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1636 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1637 #endif
1638 out_err:
1639 /*
1640 * No need to worry about unhashing the dentry, as the
1641 * lookup validation will know that the inode is bad.
1642 * (But we fall through to invalidate the caches.)
1643 */
1644 nfs_invalidate_inode(inode);
1645 return -ESTALE;
1646
1647 out_fileid:
1648 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1649 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1650 NFS_SERVER(inode)->hostname, inode->i_sb->s_id,
1651 (long long)nfsi->fileid, (long long)fattr->fileid);
1652 goto out_err;
1653 }
1654
1655 /*
1656 * File system information
1657 */
1658
1659 static int nfs_set_super(struct super_block *s, void *data)
1660 {
1661 s->s_fs_info = data;
1662 return set_anon_super(s, data);
1663 }
1664
1665 static int nfs_compare_super(struct super_block *sb, void *data)
1666 {
1667 struct nfs_server *server = data;
1668 struct nfs_server *old = NFS_SB(sb);
1669
1670 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1671 return 0;
1672 if (old->addr.sin_port != server->addr.sin_port)
1673 return 0;
1674 return !nfs_compare_fh(&old->fh, &server->fh);
1675 }
1676
1677 static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1678 int flags, const char *dev_name, void *raw_data)
1679 {
1680 int error;
1681 struct nfs_server *server = NULL;
1682 struct super_block *s;
1683 struct nfs_fh *root;
1684 struct nfs_mount_data *data = raw_data;
1685
1686 s = ERR_PTR(-EINVAL);
1687 if (data == NULL) {
1688 dprintk("%s: missing data argument\n", __FUNCTION__);
1689 goto out_err;
1690 }
1691 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1692 dprintk("%s: bad mount version\n", __FUNCTION__);
1693 goto out_err;
1694 }
1695 switch (data->version) {
1696 case 1:
1697 data->namlen = 0;
1698 case 2:
1699 data->bsize = 0;
1700 case 3:
1701 if (data->flags & NFS_MOUNT_VER3) {
1702 dprintk("%s: mount structure version %d does not support NFSv3\n",
1703 __FUNCTION__,
1704 data->version);
1705 goto out_err;
1706 }
1707 data->root.size = NFS2_FHSIZE;
1708 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1709 case 4:
1710 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1711 dprintk("%s: mount structure version %d does not support strong security\n",
1712 __FUNCTION__,
1713 data->version);
1714 goto out_err;
1715 }
1716 case 5:
1717 memset(data->context, 0, sizeof(data->context));
1718 }
1719 #ifndef CONFIG_NFS_V3
1720 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1721 s = ERR_PTR(-EPROTONOSUPPORT);
1722 if (data->flags & NFS_MOUNT_VER3) {
1723 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1724 goto out_err;
1725 }
1726 #endif /* CONFIG_NFS_V3 */
1727
1728 s = ERR_PTR(-ENOMEM);
1729 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1730 if (!server)
1731 goto out_err;
1732 /* Zero out the NFS state stuff */
1733 init_nfsv4_state(server);
1734 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1735
1736 root = &server->fh;
1737 if (data->flags & NFS_MOUNT_VER3)
1738 root->size = data->root.size;
1739 else
1740 root->size = NFS2_FHSIZE;
1741 s = ERR_PTR(-EINVAL);
1742 if (root->size > sizeof(root->data)) {
1743 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1744 goto out_err;
1745 }
1746 memcpy(root->data, data->root.data, root->size);
1747
1748 /* We now require that the mount process passes the remote address */
1749 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1750 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1751 dprintk("%s: mount program didn't pass remote address!\n",
1752 __FUNCTION__);
1753 goto out_err;
1754 }
1755
1756 /* Fire up rpciod if not yet running */
1757 s = ERR_PTR(rpciod_up());
1758 if (IS_ERR(s)) {
1759 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1760 __FUNCTION__, PTR_ERR(s));
1761 goto out_err;
1762 }
1763
1764 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1765 if (IS_ERR(s) || s->s_root)
1766 goto out_rpciod_down;
1767
1768 s->s_flags = flags;
1769
1770 error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1771 if (error) {
1772 up_write(&s->s_umount);
1773 deactivate_super(s);
1774 return ERR_PTR(error);
1775 }
1776 s->s_flags |= MS_ACTIVE;
1777 return s;
1778 out_rpciod_down:
1779 rpciod_down();
1780 out_err:
1781 kfree(server);
1782 return s;
1783 }
1784
1785 static void nfs_kill_super(struct super_block *s)
1786 {
1787 struct nfs_server *server = NFS_SB(s);
1788
1789 kill_anon_super(s);
1790
1791 if (!IS_ERR(server->client))
1792 rpc_shutdown_client(server->client);
1793 if (!IS_ERR(server->client_sys))
1794 rpc_shutdown_client(server->client_sys);
1795 if (!IS_ERR(server->client_acl))
1796 rpc_shutdown_client(server->client_acl);
1797
1798 if (!(server->flags & NFS_MOUNT_NONLM))
1799 lockd_down(); /* release rpc.lockd */
1800
1801 rpciod_down(); /* release rpciod */
1802
1803 nfs_free_iostats(server->io_stats);
1804 kfree(server->hostname);
1805 kfree(server);
1806 }
1807
1808 static struct file_system_type nfs_fs_type = {
1809 .owner = THIS_MODULE,
1810 .name = "nfs",
1811 .get_sb = nfs_get_sb,
1812 .kill_sb = nfs_kill_super,
1813 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1814 };
1815
1816 #ifdef CONFIG_NFS_V4
1817
1818 static void nfs4_clear_inode(struct inode *);
1819
1820
1821 static struct super_operations nfs4_sops = {
1822 .alloc_inode = nfs_alloc_inode,
1823 .destroy_inode = nfs_destroy_inode,
1824 .write_inode = nfs_write_inode,
1825 .delete_inode = nfs_delete_inode,
1826 .statfs = nfs_statfs,
1827 .clear_inode = nfs4_clear_inode,
1828 .umount_begin = nfs_umount_begin,
1829 .show_options = nfs_show_options,
1830 .show_stats = nfs_show_stats,
1831 };
1832
1833 /*
1834 * Clean out any remaining NFSv4 state that might be left over due
1835 * to open() calls that passed nfs_atomic_lookup, but failed to call
1836 * nfs_open().
1837 */
1838 static void nfs4_clear_inode(struct inode *inode)
1839 {
1840 struct nfs_inode *nfsi = NFS_I(inode);
1841
1842 /* If we are holding a delegation, return it! */
1843 nfs_inode_return_delegation(inode);
1844 /* First call standard NFS clear_inode() code */
1845 nfs_clear_inode(inode);
1846 /* Now clear out any remaining state */
1847 while (!list_empty(&nfsi->open_states)) {
1848 struct nfs4_state *state;
1849
1850 state = list_entry(nfsi->open_states.next,
1851 struct nfs4_state,
1852 inode_states);
1853 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1854 __FUNCTION__,
1855 inode->i_sb->s_id,
1856 (long long)NFS_FILEID(inode),
1857 state);
1858 BUG_ON(atomic_read(&state->count) != 1);
1859 nfs4_close_state(state, state->state);
1860 }
1861 }
1862
1863
1864 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1865 {
1866 struct nfs_server *server;
1867 struct nfs4_client *clp = NULL;
1868 struct rpc_xprt *xprt = NULL;
1869 struct rpc_clnt *clnt = NULL;
1870 struct rpc_timeout timeparms;
1871 rpc_authflavor_t authflavour;
1872 int err = -EIO;
1873
1874 sb->s_blocksize_bits = 0;
1875 sb->s_blocksize = 0;
1876 server = NFS_SB(sb);
1877 if (data->rsize != 0)
1878 server->rsize = nfs_block_size(data->rsize, NULL);
1879 if (data->wsize != 0)
1880 server->wsize = nfs_block_size(data->wsize, NULL);
1881 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1882 server->caps = NFS_CAP_ATOMIC_OPEN;
1883
1884 server->acregmin = data->acregmin*HZ;
1885 server->acregmax = data->acregmax*HZ;
1886 server->acdirmin = data->acdirmin*HZ;
1887 server->acdirmax = data->acdirmax*HZ;
1888
1889 server->rpc_ops = &nfs_v4_clientops;
1890
1891 nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1892
1893 server->retrans_timeo = timeparms.to_initval;
1894 server->retrans_count = timeparms.to_retries;
1895
1896 clp = nfs4_get_client(&server->addr.sin_addr);
1897 if (!clp) {
1898 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1899 return -EIO;
1900 }
1901
1902 /* Now create transport and client */
1903 authflavour = RPC_AUTH_UNIX;
1904 if (data->auth_flavourlen != 0) {
1905 if (data->auth_flavourlen != 1) {
1906 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1907 __FUNCTION__, data->auth_flavourlen);
1908 err = -EINVAL;
1909 goto out_fail;
1910 }
1911 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1912 err = -EFAULT;
1913 goto out_fail;
1914 }
1915 }
1916
1917 down_write(&clp->cl_sem);
1918 if (IS_ERR(clp->cl_rpcclient)) {
1919 xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
1920 if (IS_ERR(xprt)) {
1921 up_write(&clp->cl_sem);
1922 err = PTR_ERR(xprt);
1923 dprintk("%s: cannot create RPC transport. Error = %d\n",
1924 __FUNCTION__, err);
1925 goto out_fail;
1926 }
1927 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1928 server->rpc_ops->version, authflavour);
1929 if (IS_ERR(clnt)) {
1930 up_write(&clp->cl_sem);
1931 err = PTR_ERR(clnt);
1932 dprintk("%s: cannot create RPC client. Error = %d\n",
1933 __FUNCTION__, err);
1934 goto out_fail;
1935 }
1936 clnt->cl_intr = 1;
1937 clnt->cl_softrtry = 1;
1938 clp->cl_rpcclient = clnt;
1939 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1940 nfs_idmap_new(clp);
1941 }
1942 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1943 clnt = rpc_clone_client(clp->cl_rpcclient);
1944 if (!IS_ERR(clnt))
1945 server->nfs4_state = clp;
1946 up_write(&clp->cl_sem);
1947 clp = NULL;
1948
1949 if (IS_ERR(clnt)) {
1950 err = PTR_ERR(clnt);
1951 dprintk("%s: cannot create RPC client. Error = %d\n",
1952 __FUNCTION__, err);
1953 return err;
1954 }
1955
1956 server->client = clnt;
1957
1958 if (server->nfs4_state->cl_idmap == NULL) {
1959 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1960 return -ENOMEM;
1961 }
1962
1963 if (clnt->cl_auth->au_flavor != authflavour) {
1964 struct rpc_auth *auth;
1965
1966 auth = rpcauth_create(authflavour, clnt);
1967 if (IS_ERR(auth)) {
1968 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1969 return PTR_ERR(auth);
1970 }
1971 }
1972
1973 sb->s_time_gran = 1;
1974
1975 sb->s_op = &nfs4_sops;
1976 err = nfs_sb_init(sb, authflavour);
1977 if (err == 0)
1978 return 0;
1979 out_fail:
1980 if (clp)
1981 nfs4_put_client(clp);
1982 return err;
1983 }
1984
1985 static int nfs4_compare_super(struct super_block *sb, void *data)
1986 {
1987 struct nfs_server *server = data;
1988 struct nfs_server *old = NFS_SB(sb);
1989
1990 if (strcmp(server->hostname, old->hostname) != 0)
1991 return 0;
1992 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1993 return 0;
1994 return 1;
1995 }
1996
1997 static void *
1998 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1999 {
2000 void *p = NULL;
2001
2002 if (!src->len)
2003 return ERR_PTR(-EINVAL);
2004 if (src->len < maxlen)
2005 maxlen = src->len;
2006 if (dst == NULL) {
2007 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
2008 if (p == NULL)
2009 return ERR_PTR(-ENOMEM);
2010 }
2011 if (copy_from_user(dst, src->data, maxlen)) {
2012 kfree(p);
2013 return ERR_PTR(-EFAULT);
2014 }
2015 dst[maxlen] = '\0';
2016 return dst;
2017 }
2018
2019 static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
2020 int flags, const char *dev_name, void *raw_data)
2021 {
2022 int error;
2023 struct nfs_server *server;
2024 struct super_block *s;
2025 struct nfs4_mount_data *data = raw_data;
2026 void *p;
2027
2028 if (data == NULL) {
2029 dprintk("%s: missing data argument\n", __FUNCTION__);
2030 return ERR_PTR(-EINVAL);
2031 }
2032 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
2033 dprintk("%s: bad mount version\n", __FUNCTION__);
2034 return ERR_PTR(-EINVAL);
2035 }
2036
2037 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
2038 if (!server)
2039 return ERR_PTR(-ENOMEM);
2040 /* Zero out the NFS state stuff */
2041 init_nfsv4_state(server);
2042 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
2043
2044 p = nfs_copy_user_string(NULL, &data->hostname, 256);
2045 if (IS_ERR(p))
2046 goto out_err;
2047 server->hostname = p;
2048
2049 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
2050 if (IS_ERR(p))
2051 goto out_err;
2052 server->mnt_path = p;
2053
2054 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
2055 sizeof(server->ip_addr) - 1);
2056 if (IS_ERR(p))
2057 goto out_err;
2058
2059 /* We now require that the mount process passes the remote address */
2060 if (data->host_addrlen != sizeof(server->addr)) {
2061 s = ERR_PTR(-EINVAL);
2062 goto out_free;
2063 }
2064 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
2065 s = ERR_PTR(-EFAULT);
2066 goto out_free;
2067 }
2068 if (server->addr.sin_family != AF_INET ||
2069 server->addr.sin_addr.s_addr == INADDR_ANY) {
2070 dprintk("%s: mount program didn't pass remote IP address!\n",
2071 __FUNCTION__);
2072 s = ERR_PTR(-EINVAL);
2073 goto out_free;
2074 }
2075
2076 /* Fire up rpciod if not yet running */
2077 s = ERR_PTR(rpciod_up());
2078 if (IS_ERR(s)) {
2079 dprintk("%s: couldn't start rpciod! Error = %ld\n",
2080 __FUNCTION__, PTR_ERR(s));
2081 goto out_free;
2082 }
2083
2084 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
2085
2086 if (IS_ERR(s) || s->s_root)
2087 goto out_free;
2088
2089 s->s_flags = flags;
2090
2091 error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
2092 if (error) {
2093 up_write(&s->s_umount);
2094 deactivate_super(s);
2095 return ERR_PTR(error);
2096 }
2097 s->s_flags |= MS_ACTIVE;
2098 return s;
2099 out_err:
2100 s = (struct super_block *)p;
2101 out_free:
2102 kfree(server->mnt_path);
2103 kfree(server->hostname);
2104 kfree(server);
2105 return s;
2106 }
2107
2108 static void nfs4_kill_super(struct super_block *sb)
2109 {
2110 struct nfs_server *server = NFS_SB(sb);
2111
2112 nfs_return_all_delegations(sb);
2113 kill_anon_super(sb);
2114
2115 nfs4_renewd_prepare_shutdown(server);
2116
2117 if (server->client != NULL && !IS_ERR(server->client))
2118 rpc_shutdown_client(server->client);
2119
2120 destroy_nfsv4_state(server);
2121
2122 rpciod_down();
2123
2124 nfs_free_iostats(server->io_stats);
2125 kfree(server->hostname);
2126 kfree(server);
2127 }
2128
2129 static struct file_system_type nfs4_fs_type = {
2130 .owner = THIS_MODULE,
2131 .name = "nfs4",
2132 .get_sb = nfs4_get_sb,
2133 .kill_sb = nfs4_kill_super,
2134 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
2135 };
2136
2137 static const int nfs_set_port_min = 0;
2138 static const int nfs_set_port_max = 65535;
2139 static int param_set_port(const char *val, struct kernel_param *kp)
2140 {
2141 char *endp;
2142 int num = simple_strtol(val, &endp, 0);
2143 if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
2144 return -EINVAL;
2145 *((int *)kp->arg) = num;
2146 return 0;
2147 }
2148
2149 module_param_call(callback_tcpport, param_set_port, param_get_int,
2150 &nfs_callback_set_tcpport, 0644);
2151
2152 static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
2153 {
2154 char *endp;
2155 int num = simple_strtol(val, &endp, 0);
2156 int jif = num * HZ;
2157 if (endp == val || *endp || num < 0 || jif < num)
2158 return -EINVAL;
2159 *((int *)kp->arg) = jif;
2160 return 0;
2161 }
2162
2163 module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
2164 &nfs_idmap_cache_timeout, 0644);
2165
2166 #define nfs4_init_once(nfsi) \
2167 do { \
2168 INIT_LIST_HEAD(&(nfsi)->open_states); \
2169 nfsi->delegation = NULL; \
2170 nfsi->delegation_state = 0; \
2171 init_rwsem(&nfsi->rwsem); \
2172 } while(0)
2173
2174 static inline int register_nfs4fs(void)
2175 {
2176 int ret;
2177
2178 ret = nfs_register_sysctl();
2179 if (ret != 0)
2180 return ret;
2181 ret = register_filesystem(&nfs4_fs_type);
2182 if (ret != 0)
2183 nfs_unregister_sysctl();
2184 return ret;
2185 }
2186
2187 static inline void unregister_nfs4fs(void)
2188 {
2189 unregister_filesystem(&nfs4_fs_type);
2190 nfs_unregister_sysctl();
2191 }
2192 #else
2193 #define nfs4_init_once(nfsi) \
2194 do { } while (0)
2195 #define register_nfs4fs() (0)
2196 #define unregister_nfs4fs()
2197 #endif
2198
2199 extern int nfs_init_nfspagecache(void);
2200 extern void nfs_destroy_nfspagecache(void);
2201 extern int nfs_init_readpagecache(void);
2202 extern void nfs_destroy_readpagecache(void);
2203 extern int nfs_init_writepagecache(void);
2204 extern void nfs_destroy_writepagecache(void);
2205 #ifdef CONFIG_NFS_DIRECTIO
2206 extern int nfs_init_directcache(void);
2207 extern void nfs_destroy_directcache(void);
2208 #endif
2209
2210 static kmem_cache_t * nfs_inode_cachep;
2211
2212 static struct inode *nfs_alloc_inode(struct super_block *sb)
2213 {
2214 struct nfs_inode *nfsi;
2215 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
2216 if (!nfsi)
2217 return NULL;
2218 nfsi->flags = 0UL;
2219 nfsi->cache_validity = 0UL;
2220 nfsi->cache_change_attribute = jiffies;
2221 #ifdef CONFIG_NFS_V3_ACL
2222 nfsi->acl_access = ERR_PTR(-EAGAIN);
2223 nfsi->acl_default = ERR_PTR(-EAGAIN);
2224 #endif
2225 #ifdef CONFIG_NFS_V4
2226 nfsi->nfs4_acl = NULL;
2227 #endif /* CONFIG_NFS_V4 */
2228 return &nfsi->vfs_inode;
2229 }
2230
2231 static void nfs_destroy_inode(struct inode *inode)
2232 {
2233 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2234 }
2235
2236 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
2237 {
2238 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2239
2240 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2241 SLAB_CTOR_CONSTRUCTOR) {
2242 inode_init_once(&nfsi->vfs_inode);
2243 spin_lock_init(&nfsi->req_lock);
2244 INIT_LIST_HEAD(&nfsi->dirty);
2245 INIT_LIST_HEAD(&nfsi->commit);
2246 INIT_LIST_HEAD(&nfsi->open_files);
2247 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
2248 atomic_set(&nfsi->data_updates, 0);
2249 nfsi->ndirty = 0;
2250 nfsi->ncommit = 0;
2251 nfsi->npages = 0;
2252 nfs4_init_once(nfsi);
2253 }
2254 }
2255
2256 static int nfs_init_inodecache(void)
2257 {
2258 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2259 sizeof(struct nfs_inode),
2260 0, (SLAB_RECLAIM_ACCOUNT|
2261 SLAB_MEM_SPREAD),
2262 init_once, NULL);
2263 if (nfs_inode_cachep == NULL)
2264 return -ENOMEM;
2265
2266 return 0;
2267 }
2268
2269 static void nfs_destroy_inodecache(void)
2270 {
2271 if (kmem_cache_destroy(nfs_inode_cachep))
2272 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
2273 }
2274
2275 /*
2276 * Initialize NFS
2277 */
2278 static int __init init_nfs_fs(void)
2279 {
2280 int err;
2281
2282 err = nfs_init_nfspagecache();
2283 if (err)
2284 goto out4;
2285
2286 err = nfs_init_inodecache();
2287 if (err)
2288 goto out3;
2289
2290 err = nfs_init_readpagecache();
2291 if (err)
2292 goto out2;
2293
2294 err = nfs_init_writepagecache();
2295 if (err)
2296 goto out1;
2297
2298 #ifdef CONFIG_NFS_DIRECTIO
2299 err = nfs_init_directcache();
2300 if (err)
2301 goto out0;
2302 #endif
2303
2304 #ifdef CONFIG_PROC_FS
2305 rpc_proc_register(&nfs_rpcstat);
2306 #endif
2307 err = register_filesystem(&nfs_fs_type);
2308 if (err)
2309 goto out;
2310 if ((err = register_nfs4fs()) != 0)
2311 goto out;
2312 return 0;
2313 out:
2314 #ifdef CONFIG_PROC_FS
2315 rpc_proc_unregister("nfs");
2316 #endif
2317 #ifdef CONFIG_NFS_DIRECTIO
2318 nfs_destroy_directcache();
2319 out0:
2320 #endif
2321 nfs_destroy_writepagecache();
2322 out1:
2323 nfs_destroy_readpagecache();
2324 out2:
2325 nfs_destroy_inodecache();
2326 out3:
2327 nfs_destroy_nfspagecache();
2328 out4:
2329 return err;
2330 }
2331
2332 static void __exit exit_nfs_fs(void)
2333 {
2334 #ifdef CONFIG_NFS_DIRECTIO
2335 nfs_destroy_directcache();
2336 #endif
2337 nfs_destroy_writepagecache();
2338 nfs_destroy_readpagecache();
2339 nfs_destroy_inodecache();
2340 nfs_destroy_nfspagecache();
2341 #ifdef CONFIG_PROC_FS
2342 rpc_proc_unregister("nfs");
2343 #endif
2344 unregister_filesystem(&nfs_fs_type);
2345 unregister_nfs4fs();
2346 }
2347
2348 /* Not quite true; I just maintain it */
2349 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2350 MODULE_LICENSE("GPL");
2351
2352 module_init(init_nfs_fs)
2353 module_exit(exit_nfs_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree