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[PATCH] 9p: remove superflous MS_NODIRATIME assignment
[deliverable/linux.git] / fs / nfs / inode.c
CommitLineData
1da177e4
LT		 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/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
33#include <linux/smp_lock.h>
34#include <linux/seq_file.h>
35#include <linux/mount.h>
36#include <linux/nfs_idmap.h>
37#include <linux/vfs.h>
38
39#include <asm/system.h>
40#include <asm/uaccess.h>
41
4ce79717 42#include "nfs4_fs.h"
a72b4422 43#include "callback.h"
1da177e4
LT		 44#include "delegation.h"
45
46#define NFSDBG_FACILITY NFSDBG_VFS
47#define NFS_PARANOIA 1
48
49/* Maximum number of readahead requests
50 * FIXME: this should really be a sysctl so that users may tune it to suit
51 * their needs. People that do NFS over a slow network, might for
52 * instance want to reduce it to something closer to 1 for improved
53 * interactive response.
54 */
55#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
56
57static void nfs_invalidate_inode(struct inode *);
24aa1fe6 58static int nfs_update_inode(struct inode *, struct nfs_fattr *);
1da177e4
LT		 59
60static struct inode *nfs_alloc_inode(struct super_block *sb);
61static void nfs_destroy_inode(struct inode *);
62static int nfs_write_inode(struct inode *,int);
63static void nfs_delete_inode(struct inode *);
64static void nfs_clear_inode(struct inode *);
65static void nfs_umount_begin(struct super_block *);
66static int nfs_statfs(struct super_block *, struct kstatfs *);
67static int nfs_show_options(struct seq_file *, struct vfsmount *);
ada70d94 68static void nfs_zap_acl_cache(struct inode *);
1da177e4
LT		 69
70static struct rpc_program nfs_program;
71
72static struct super_operations nfs_sops = {
73 .alloc_inode = nfs_alloc_inode,
74 .destroy_inode = nfs_destroy_inode,
75 .write_inode = nfs_write_inode,
76 .delete_inode = nfs_delete_inode,
77 .statfs = nfs_statfs,
78 .clear_inode = nfs_clear_inode,
79 .umount_begin = nfs_umount_begin,
80 .show_options = nfs_show_options,
81};
82
83/*
84 * RPC cruft for NFS
85 */
86static struct rpc_stat nfs_rpcstat = {
87 .program = &nfs_program
88};
89static struct rpc_version * nfs_version[] = {
90 NULL,
91 NULL,
92 &nfs_version2,
93#if defined(CONFIG_NFS_V3)
94 &nfs_version3,
95#elif defined(CONFIG_NFS_V4)
96 NULL,
97#endif
98#if defined(CONFIG_NFS_V4)
99 &nfs_version4,
100#endif
101};
102
103static struct rpc_program nfs_program = {
104 .name = "nfs",
105 .number = NFS_PROGRAM,
106 .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
107 .version = nfs_version,
108 .stats = &nfs_rpcstat,
109 .pipe_dir_name = "/nfs",
110};
111
b7fa0554
AG		 112#ifdef CONFIG_NFS_V3_ACL
113static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
114static struct rpc_version * nfsacl_version[] = {
115 [3] = &nfsacl_version3,
116};
117
118struct rpc_program nfsacl_program = {
119 .name = "nfsacl",
120 .number = NFS_ACL_PROGRAM,
121 .nrvers = sizeof(nfsacl_version) / sizeof(nfsacl_version[0]),
122 .version = nfsacl_version,
123 .stats = &nfsacl_rpcstat,
124};
125#endif /* CONFIG_NFS_V3_ACL */
126
1da177e4
LT		 127static inline unsigned long
128nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
129{
130 return nfs_fileid_to_ino_t(fattr->fileid);
131}
132
133static int
134nfs_write_inode(struct inode *inode, int sync)
135{
136 int flags = sync ? FLUSH_WAIT : 0;
137 int ret;
138
3da28eb1 139 ret = nfs_commit_inode(inode, flags);
1da177e4
LT		 140 if (ret < 0)
141 return ret;
142 return 0;
143}
144
145static void
146nfs_delete_inode(struct inode * inode)
147{
148 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
149
fef26658
MF		 150 truncate_inode_pages(&inode->i_data, 0);
151
1da177e4
LT		 152 nfs_wb_all(inode);
153 /*
154 * The following should never happen...
155 */
156 if (nfs_have_writebacks(inode)) {
157 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
158 }
159
160 clear_inode(inode);
161}
162
1da177e4
LT		 163static void
164nfs_clear_inode(struct inode *inode)
165{
166 struct nfs_inode *nfsi = NFS_I(inode);
167 struct rpc_cred *cred;
168
169 nfs_wb_all(inode);
170 BUG_ON (!list_empty(&nfsi->open_files));
ada70d94 171 nfs_zap_acl_cache(inode);
1da177e4
LT		 172 cred = nfsi->cache_access.cred;
173 if (cred)
174 put_rpccred(cred);
175 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
176}
177
178void
179nfs_umount_begin(struct super_block *sb)
180{
6a19275a 181 struct rpc_clnt *rpc = NFS_SB(sb)->client;
1da177e4
LT		 182
183 /* -EIO all pending I/O */
6a19275a 184 if (!IS_ERR(rpc))
1da177e4 185 rpc_killall_tasks(rpc);
b7fa0554
AG		 186 rpc = NFS_SB(sb)->client_acl;
187 if (!IS_ERR(rpc))
188 rpc_killall_tasks(rpc);
1da177e4
LT		 189}
190
191
192static inline unsigned long
193nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
194{
195 /* make sure blocksize is a power of two */
196 if ((bsize & (bsize - 1)) || nrbitsp) {
197 unsigned char nrbits;
198
199 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
200 ;
201 bsize = 1 << nrbits;
202 if (nrbitsp)
203 *nrbitsp = nrbits;
204 }
205
206 return bsize;
207}
208
209/*
210 * Calculate the number of 512byte blocks used.
211 */
212static inline unsigned long
213nfs_calc_block_size(u64 tsize)
214{
215 loff_t used = (tsize + 511) >> 9;
216 return (used > ULONG_MAX) ? ULONG_MAX : used;
217}
218
219/*
220 * Compute and set NFS server blocksize
221 */
222static inline unsigned long
223nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
224{
40859d7e
CL		 225 if (bsize < NFS_MIN_FILE_IO_SIZE)
226 bsize = NFS_DEF_FILE_IO_SIZE;
227 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
228 bsize = NFS_MAX_FILE_IO_SIZE;
1da177e4
LT		 229
230 return nfs_block_bits(bsize, nrbitsp);
231}
232
233/*
234 * Obtain the root inode of the file system.
235 */
236static struct inode *
237nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
238{
239 struct nfs_server *server = NFS_SB(sb);
240 struct inode *rooti;
241 int error;
242
243 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
244 if (error < 0) {
245 dprintk("nfs_get_root: getattr error = %d\n", -error);
246 return ERR_PTR(error);
247 }
248
249 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
250 if (!rooti)
251 return ERR_PTR(-ENOMEM);
252 return rooti;
253}
254
255/*
256 * Do NFS version-independent mount processing, and sanity checking
257 */
258static int
259nfs_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 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
281 /* Did getting the root inode fail? */
282 if (IS_ERR(root_inode)) {
283 no_root_error = PTR_ERR(root_inode);
284 goto out_no_root;
285 }
286 sb->s_root = d_alloc_root(root_inode);
287 if (!sb->s_root) {
288 no_root_error = -ENOMEM;
289 goto out_no_root;
290 }
291 sb->s_root->d_op = server->rpc_ops->dentry_ops;
292
293 /* Get some general file system info */
294 if (server->namelen == 0 &&
295 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
296 server->namelen = pathinfo.max_namelen;
297 /* Work out a lot of parameters */
298 if (server->rsize == 0)
299 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
300 if (server->wsize == 0)
301 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
302
303 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
304 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
305 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
306 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
307
308 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
309 if (server->rsize > max_rpc_payload)
310 server->rsize = max_rpc_payload;
40859d7e
CL		 311 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
312 server->rsize = NFS_MAX_FILE_IO_SIZE;
1da177e4 313 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1da177e4 314
40859d7e
CL		 315 if (server->wsize > max_rpc_payload)
316 server->wsize = max_rpc_payload;
317 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
318 server->wsize = NFS_MAX_FILE_IO_SIZE;
1da177e4 319 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1da177e4
LT		 320
321 if (sb->s_blocksize == 0)
322 sb->s_blocksize = nfs_block_bits(server->wsize,
323 &sb->s_blocksize_bits);
324 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
325
326 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
327 if (server->dtsize > PAGE_CACHE_SIZE)
328 server->dtsize = PAGE_CACHE_SIZE;
329 if (server->dtsize > server->rsize)
330 server->dtsize = server->rsize;
331
332 if (server->flags & NFS_MOUNT_NOAC) {
333 server->acregmin = server->acregmax = 0;
334 server->acdirmin = server->acdirmax = 0;
335 sb->s_flags |= MS_SYNCHRONOUS;
336 }
337 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
338
339 sb->s_maxbytes = fsinfo.maxfilesize;
340 if (sb->s_maxbytes > MAX_LFS_FILESIZE)
341 sb->s_maxbytes = MAX_LFS_FILESIZE;
342
343 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
344 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
345
346 /* We're airborne Set socket buffersize */
347 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
348 return 0;
349 /* Yargs. It didn't work out. */
350out_no_root:
351 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
352 if (!IS_ERR(root_inode))
353 iput(root_inode);
354 return no_root_error;
355}
356
eab5c084
CL		 357static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
358{
359 to->to_initval = timeo * HZ / 10;
360 to->to_retries = retrans;
361 if (!to->to_retries)
362 to->to_retries = 2;
363
364 switch (proto) {
365 case IPPROTO_TCP:
366 if (!to->to_initval)
367 to->to_initval = 60 * HZ;
03bf4b70
CL		 368 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
369 to->to_initval = NFS_MAX_TCP_TIMEOUT;
eab5c084
CL		 370 to->to_increment = to->to_initval;
371 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
372 to->to_exponential = 0;
373 break;
374 case IPPROTO_UDP:
375 default:
376 if (!to->to_initval)
377 to->to_initval = 11 * HZ / 10;
03bf4b70
CL		 378 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
379 to->to_initval = NFS_MAX_UDP_TIMEOUT;
380 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
eab5c084
CL		 381 to->to_exponential = 1;
382 break;
383 }
384}
385
1da177e4
LT		 386/*
387 * Create an RPC client handle.
388 */
389static struct rpc_clnt *
390nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
391{
392 struct rpc_timeout timeparms;
393 struct rpc_xprt *xprt = NULL;
394 struct rpc_clnt *clnt = NULL;
eab5c084 395 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
1da177e4 396
eab5c084 397 nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
1da177e4
LT		 398
399 /* create transport and client */
eab5c084 400 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
1da177e4 401 if (IS_ERR(xprt)) {
9085bbcb
TM		 402 dprintk("%s: cannot create RPC transport. Error = %ld\n",
403 __FUNCTION__, PTR_ERR(xprt));
1da177e4
LT		 404 return (struct rpc_clnt *)xprt;
405 }
406 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
407 server->rpc_ops->version, data->pseudoflavor);
408 if (IS_ERR(clnt)) {
9085bbcb
TM		 409 dprintk("%s: cannot create RPC client. Error = %ld\n",
410 __FUNCTION__, PTR_ERR(xprt));
1da177e4
LT		 411 goto out_fail;
412 }
413
414 clnt->cl_intr = 1;
415 clnt->cl_softrtry = 1;
1da177e4
LT		 416
417 return clnt;
418
419out_fail:
1da177e4
LT		 420 return clnt;
421}
422
423/*
424 * The way this works is that the mount process passes a structure
425 * in the data argument which contains the server's IP address
426 * and the root file handle obtained from the server's mount
427 * daemon. We stash these away in the private superblock fields.
428 */
429static int
430nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
431{
432 struct nfs_server *server;
433 rpc_authflavor_t authflavor;
434
435 server = NFS_SB(sb);
436 sb->s_blocksize_bits = 0;
437 sb->s_blocksize = 0;
438 if (data->bsize)
439 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
440 if (data->rsize)
441 server->rsize = nfs_block_size(data->rsize, NULL);
442 if (data->wsize)
443 server->wsize = nfs_block_size(data->wsize, NULL);
444 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
445
446 server->acregmin = data->acregmin*HZ;
447 server->acregmax = data->acregmax*HZ;
448 server->acdirmin = data->acdirmin*HZ;
449 server->acdirmax = data->acdirmax*HZ;
450
451 /* Start lockd here, before we might error out */
452 if (!(server->flags & NFS_MOUNT_NONLM))
453 lockd_up();
454
455 server->namelen = data->namlen;
456 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
457 if (!server->hostname)
458 return -ENOMEM;
459 strcpy(server->hostname, data->hostname);
460
461 /* Check NFS protocol revision and initialize RPC op vector
462 * and file handle pool. */
1da177e4 463#ifdef CONFIG_NFS_V3
9085bbcb 464 if (server->flags & NFS_MOUNT_VER3) {
1da177e4
LT		 465 server->rpc_ops = &nfs_v3_clientops;
466 server->caps |= NFS_CAP_READDIRPLUS;
1da177e4
LT		 467 } else {
468 server->rpc_ops = &nfs_v2_clientops;
469 }
9085bbcb
TM		 470#else
471 server->rpc_ops = &nfs_v2_clientops;
472#endif
1da177e4
LT		 473
474 /* Fill in pseudoflavor for mount version < 5 */
475 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
476 data->pseudoflavor = RPC_AUTH_UNIX;
477 authflavor = data->pseudoflavor; /* save for sb_init() */
478 /* XXX maybe we want to add a server->pseudoflavor field */
479
480 /* Create RPC client handles */
481 server->client = nfs_create_client(server, data);
482 if (IS_ERR(server->client))
483 return PTR_ERR(server->client);
484 /* RFC 2623, sec 2.3.2 */
485 if (authflavor != RPC_AUTH_UNIX) {
6a19275a
BF		 486 struct rpc_auth *auth;
487
1da177e4
LT		 488 server->client_sys = rpc_clone_client(server->client);
489 if (IS_ERR(server->client_sys))
490 return PTR_ERR(server->client_sys);
6a19275a
BF		 491 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
492 if (IS_ERR(auth))
493 return PTR_ERR(auth);
1da177e4
LT		 494 } else {
495 atomic_inc(&server->client->cl_count);
496 server->client_sys = server->client;
497 }
1da177e4 498 if (server->flags & NFS_MOUNT_VER3) {
b7fa0554
AG		 499#ifdef CONFIG_NFS_V3_ACL
500 if (!(server->flags & NFS_MOUNT_NOACL)) {
501 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
502 /* No errors! Assume that Sun nfsacls are supported */
503 if (!IS_ERR(server->client_acl))
504 server->caps |= NFS_CAP_ACLS;
505 }
506#else
507 server->flags &= ~NFS_MOUNT_NOACL;
508#endif /* CONFIG_NFS_V3_ACL */
055ffbea
AG		 509 /*
510 * The VFS shouldn't apply the umask to mode bits. We will
511 * do so ourselves when necessary.
512 */
513 sb->s_flags |= MS_POSIXACL;
1da177e4
LT		 514 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
515 server->namelen = NFS3_MAXNAMLEN;
516 sb->s_time_gran = 1;
517 } else {
518 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
519 server->namelen = NFS2_MAXNAMLEN;
520 }
521
522 sb->s_op = &nfs_sops;
523 return nfs_sb_init(sb, authflavor);
524}
525
526static int
527nfs_statfs(struct super_block *sb, struct kstatfs *buf)
528{
529 struct nfs_server *server = NFS_SB(sb);
530 unsigned char blockbits;
531 unsigned long blockres;
532 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
533 struct nfs_fattr fattr;
534 struct nfs_fsstat res = {
535 .fattr = &fattr,
536 };
537 int error;
538
539 lock_kernel();
540
541 error = server->rpc_ops->statfs(server, rootfh, &res);
542 buf->f_type = NFS_SUPER_MAGIC;
543 if (error < 0)
544 goto out_err;
545
546 /*
547 * Current versions of glibc do not correctly handle the
548 * case where f_frsize != f_bsize. Eventually we want to
549 * report the value of wtmult in this field.
550 */
551 buf->f_frsize = sb->s_blocksize;
552
553 /*
554 * On most *nix systems, f_blocks, f_bfree, and f_bavail
555 * are reported in units of f_frsize. Linux hasn't had
556 * an f_frsize field in its statfs struct until recently,
557 * thus historically Linux's sys_statfs reports these
558 * fields in units of f_bsize.
559 */
560 buf->f_bsize = sb->s_blocksize;
561 blockbits = sb->s_blocksize_bits;
562 blockres = (1 << blockbits) - 1;
563 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
564 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
565 buf->f_bavail = (res.abytes + blockres) >> blockbits;
566
567 buf->f_files = res.tfiles;
568 buf->f_ffree = res.afiles;
569
570 buf->f_namelen = server->namelen;
571 out:
572 unlock_kernel();
1da177e4
LT		 573 return 0;
574
575 out_err:
dc20f803 576 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
1da177e4
LT		 577 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
578 goto out;
579
580}
581
582static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
583{
584 static struct proc_nfs_info {
585 int flag;
586 char *str;
587 char *nostr;
588 } nfs_info[] = {
589 { NFS_MOUNT_SOFT, ",soft", ",hard" },
590 { NFS_MOUNT_INTR, ",intr", "" },
591 { NFS_MOUNT_POSIX, ",posix", "" },
1da177e4
LT		 592 { NFS_MOUNT_NOCTO, ",nocto", "" },
593 { NFS_MOUNT_NOAC, ",noac", "" },
594 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
b7fa0554 595 { NFS_MOUNT_NOACL, ",noacl", "" },
1da177e4
LT		 596 { 0, NULL, NULL }
597 };
598 struct proc_nfs_info *nfs_infop;
599 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
3063d8a1
TM		 600 char buf[12];
601 char *proto;
1da177e4
LT		 602
603 seq_printf(m, ",v%d", nfss->rpc_ops->version);
604 seq_printf(m, ",rsize=%d", nfss->rsize);
605 seq_printf(m, ",wsize=%d", nfss->wsize);
606 if (nfss->acregmin != 3*HZ)
607 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
608 if (nfss->acregmax != 60*HZ)
609 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
610 if (nfss->acdirmin != 30*HZ)
611 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
612 if (nfss->acdirmax != 60*HZ)
613 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
614 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
615 if (nfss->flags & nfs_infop->flag)
616 seq_puts(m, nfs_infop->str);
617 else
618 seq_puts(m, nfs_infop->nostr);
619 }
3063d8a1
TM		 620 switch (nfss->client->cl_xprt->prot) {
621 case IPPROTO_TCP:
622 proto = "tcp";
623 break;
624 case IPPROTO_UDP:
625 proto = "udp";
626 break;
627 default:
628 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
629 proto = buf;
630 }
631 seq_printf(m, ",proto=%s", proto);
1da177e4
LT		 632 seq_puts(m, ",addr=");
633 seq_escape(m, nfss->hostname, " \t\n\\");
634 return 0;
635}
636
29884df0
TM		 637/**
638 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
639 */
640int nfs_sync_mapping(struct address_space *mapping)
641{
642 int ret;
643
644 if (mapping->nrpages == 0)
645 return 0;
646 unmap_mapping_range(mapping, 0, 0, 0);
28fd1298 647 ret = filemap_write_and_wait(mapping);
29884df0
TM		 648 if (ret != 0)
649 goto out;
650 ret = nfs_wb_all(mapping->host);
651out:
652 return ret;
653}
654
1da177e4
LT		 655/*
656 * Invalidate the local caches
657 */
b37b03b7 658static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 659{
660 struct nfs_inode *nfsi = NFS_I(inode);
661 int mode = inode->i_mode;
662
663 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
664 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
665
666 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
667 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
55296809 668 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
1da177e4 669 else
55296809 670 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
b37b03b7 671}
dc59250c 672
b37b03b7
TM		 673void nfs_zap_caches(struct inode *inode)
674{
675 spin_lock(&inode->i_lock);
676 nfs_zap_caches_locked(inode);
dc59250c 677 spin_unlock(&inode->i_lock);
ada70d94
TM		 678}
679
680static void nfs_zap_acl_cache(struct inode *inode)
681{
682 void (*clear_acl_cache)(struct inode *);
683
684 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
685 if (clear_acl_cache != NULL)
686 clear_acl_cache(inode);
dc59250c 687 spin_lock(&inode->i_lock);
55296809 688 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 689 spin_unlock(&inode->i_lock);
1da177e4
LT		 690}
691
692/*
b37b03b7
TM		 693 * Invalidate, but do not unhash, the inode.
694 * NB: must be called with inode->i_lock held!
1da177e4 695 */
b37b03b7 696static void nfs_invalidate_inode(struct inode *inode)
1da177e4 697{
b37b03b7
TM		 698 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
699 nfs_zap_caches_locked(inode);
1da177e4
LT		 700}
701
702struct nfs_find_desc {
703 struct nfs_fh *fh;
704 struct nfs_fattr *fattr;
705};
706
707/*
708 * In NFSv3 we can have 64bit inode numbers. In order to support
709 * this, and re-exported directories (also seen in NFSv2)
710 * we are forced to allow 2 different inodes to have the same
711 * i_ino.
712 */
713static int
714nfs_find_actor(struct inode *inode, void *opaque)
715{
716 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
717 struct nfs_fh *fh = desc->fh;
718 struct nfs_fattr *fattr = desc->fattr;
719
720 if (NFS_FILEID(inode) != fattr->fileid)
721 return 0;
722 if (nfs_compare_fh(NFS_FH(inode), fh))
723 return 0;
724 if (is_bad_inode(inode) || NFS_STALE(inode))
725 return 0;
726 return 1;
727}
728
729static int
730nfs_init_locked(struct inode *inode, void *opaque)
731{
732 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
733 struct nfs_fattr *fattr = desc->fattr;
734
735 NFS_FILEID(inode) = fattr->fileid;
736 nfs_copy_fh(NFS_FH(inode), desc->fh);
737 return 0;
738}
739
740/* Don't use READDIRPLUS on directories that we believe are too large */
741#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
742
743/*
744 * This is our front-end to iget that looks up inodes by file handle
745 * instead of inode number.
746 */
747struct inode *
748nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
749{
750 struct nfs_find_desc desc = {
751 .fh = fh,
752 .fattr = fattr
753 };
754 struct inode *inode = NULL;
755 unsigned long hash;
756
757 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
758 goto out_no_inode;
759
760 if (!fattr->nlink) {
761 printk("NFS: Buggy server - nlink == 0!\n");
762 goto out_no_inode;
763 }
764
765 hash = nfs_fattr_to_ino_t(fattr);
766
767 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
768 goto out_no_inode;
769
770 if (inode->i_state & I_NEW) {
771 struct nfs_inode *nfsi = NFS_I(inode);
772
773 /* We set i_ino for the few things that still rely on it,
774 * such as stat(2) */
775 inode->i_ino = hash;
776
777 /* We can't support update_atime(), since the server will reset it */
778 inode->i_flags |= S_NOATIME|S_NOCMTIME;
779 inode->i_mode = fattr->mode;
780 /* Why so? Because we want revalidate for devices/FIFOs, and
781 * that's precisely what we have in nfs_file_inode_operations.
782 */
92cfc62c 783 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
1da177e4
LT		 784 if (S_ISREG(inode->i_mode)) {
785 inode->i_fop = &nfs_file_operations;
786 inode->i_data.a_ops = &nfs_file_aops;
787 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
788 } else if (S_ISDIR(inode->i_mode)) {
789 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
790 inode->i_fop = &nfs_dir_operations;
791 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
792 && fattr->size <= NFS_LIMIT_READDIRPLUS)
412d582e 793 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
1da177e4
LT		 794 } else if (S_ISLNK(inode->i_mode))
795 inode->i_op = &nfs_symlink_inode_operations;
796 else
797 init_special_inode(inode, inode->i_mode, fattr->rdev);
798
33801147
TM		 799 nfsi->read_cache_jiffies = fattr->time_start;
800 nfsi->last_updated = jiffies;
1da177e4
LT		 801 inode->i_atime = fattr->atime;
802 inode->i_mtime = fattr->mtime;
803 inode->i_ctime = fattr->ctime;
804 if (fattr->valid & NFS_ATTR_FATTR_V4)
805 nfsi->change_attr = fattr->change_attr;
806 inode->i_size = nfs_size_to_loff_t(fattr->size);
807 inode->i_nlink = fattr->nlink;
808 inode->i_uid = fattr->uid;
809 inode->i_gid = fattr->gid;
810 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
811 /*
812 * report the blocks in 512byte units
813 */
814 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
815 inode->i_blksize = inode->i_sb->s_blocksize;
816 } else {
817 inode->i_blocks = fattr->du.nfs2.blocks;
818 inode->i_blksize = fattr->du.nfs2.blocksize;
819 }
820 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
821 nfsi->attrtimeo_timestamp = jiffies;
822 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
823 nfsi->cache_access.cred = NULL;
824
825 unlock_new_inode(inode);
826 } else
827 nfs_refresh_inode(inode, fattr);
828 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
829 inode->i_sb->s_id,
830 (long long)NFS_FILEID(inode),
831 atomic_read(&inode->i_count));
832
833out:
834 return inode;
835
836out_no_inode:
837 printk("nfs_fhget: iget failed\n");
838 goto out;
839}
840
841#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
842
843int
844nfs_setattr(struct dentry *dentry, struct iattr *attr)
845{
846 struct inode *inode = dentry->d_inode;
847 struct nfs_fattr fattr;
848 int error;
849
850 if (attr->ia_valid & ATTR_SIZE) {
851 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
852 attr->ia_valid &= ~ATTR_SIZE;
853 }
854
855 /* Optimization: if the end result is no change, don't RPC */
856 attr->ia_valid &= NFS_VALID_ATTRS;
857 if (attr->ia_valid == 0)
858 return 0;
859
860 lock_kernel();
861 nfs_begin_data_update(inode);
862 /* Write all dirty data if we're changing file permissions or size */
863 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
28fd1298 864 filemap_write_and_wait(inode->i_mapping);
1da177e4
LT		 865 nfs_wb_all(inode);
866 }
642ac549
TM		 867 /*
868 * Return any delegations if we're going to change ACLs
869 */
870 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
871 nfs_inode_return_delegation(inode);
1da177e4 872 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
65e4308d 873 if (error == 0)
1da177e4 874 nfs_refresh_inode(inode, &fattr);
65e4308d
TM		 875 nfs_end_data_update(inode);
876 unlock_kernel();
877 return error;
878}
879
880/**
881 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
882 * @inode: pointer to struct inode
883 * @attr: pointer to struct iattr
884 *
885 * Note: we do this in the *proc.c in order to ensure that
886 * it works for things like exclusive creates too.
887 */
888void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
889{
890 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
1da177e4 891 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 892 int mode = attr->ia_mode & S_IALLUGO;
893 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 894 inode->i_mode = mode;
895 }
896 if ((attr->ia_valid & ATTR_UID) != 0)
897 inode->i_uid = attr->ia_uid;
898 if ((attr->ia_valid & ATTR_GID) != 0)
899 inode->i_gid = attr->ia_gid;
dc59250c 900 spin_lock(&inode->i_lock);
55296809 901 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
dc59250c 902 spin_unlock(&inode->i_lock);
65e4308d
TM		 903 }
904 if ((attr->ia_valid & ATTR_SIZE) != 0) {
905 inode->i_size = attr->ia_size;
906 vmtruncate(inode, attr->ia_size);
907 }
1da177e4
LT		 908}
909
412d582e
CL		 910static int nfs_wait_schedule(void *word)
911{
912 if (signal_pending(current))
913 return -ERESTARTSYS;
914 schedule();
915 return 0;
916}
917
1da177e4
LT		 918/*
919 * Wait for the inode to get unlocked.
1da177e4 920 */
412d582e 921static int nfs_wait_on_inode(struct inode *inode)
1da177e4
LT		 922{
923 struct rpc_clnt *clnt = NFS_CLIENT(inode);
924 struct nfs_inode *nfsi = NFS_I(inode);
412d582e 925 sigset_t oldmask;
1da177e4 926 int error;
412d582e 927
412d582e
CL		 928 rpc_clnt_sigmask(clnt, &oldmask);
929 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
930 nfs_wait_schedule, TASK_INTERRUPTIBLE);
931 rpc_clnt_sigunmask(clnt, &oldmask);
412d582e 932
1da177e4
LT		 933 return error;
934}
935
412d582e
CL		 936static void nfs_wake_up_inode(struct inode *inode)
937{
938 struct nfs_inode *nfsi = NFS_I(inode);
939
940 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
941 smp_mb__after_clear_bit();
942 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
943}
944
1da177e4
LT		 945int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
946{
947 struct inode *inode = dentry->d_inode;
55296809 948 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
1da177e4
LT		 949 int err;
950
70b9ecbd
TM		 951 /* Flush out writes to the server in order to update c/mtime */
952 nfs_sync_inode(inode, 0, 0, FLUSH_WAIT|FLUSH_NOCOMMIT);
1da177e4
LT		 953 if (__IS_FLG(inode, MS_NOATIME))
954 need_atime = 0;
955 else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
956 need_atime = 0;
957 /* We may force a getattr if the user cares about atime */
958 if (need_atime)
959 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
960 else
961 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
962 if (!err)
963 generic_fillattr(inode, stat);
964 return err;
965}
966
967struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
968{
969 struct nfs_open_context *ctx;
970
971 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
972 if (ctx != NULL) {
973 atomic_set(&ctx->count, 1);
974 ctx->dentry = dget(dentry);
975 ctx->cred = get_rpccred(cred);
976 ctx->state = NULL;
977 ctx->lockowner = current->files;
978 ctx->error = 0;
00a92642 979 ctx->dir_cookie = 0;
1da177e4
LT		 980 }
981 return ctx;
982}
983
984struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
985{
986 if (ctx != NULL)
987 atomic_inc(&ctx->count);
988 return ctx;
989}
990
991void put_nfs_open_context(struct nfs_open_context *ctx)
992{
993 if (atomic_dec_and_test(&ctx->count)) {
994 if (!list_empty(&ctx->list)) {
995 struct inode *inode = ctx->dentry->d_inode;
996 spin_lock(&inode->i_lock);
997 list_del(&ctx->list);
998 spin_unlock(&inode->i_lock);
999 }
1000 if (ctx->state != NULL)
1001 nfs4_close_state(ctx->state, ctx->mode);
1002 if (ctx->cred != NULL)
1003 put_rpccred(ctx->cred);
1004 dput(ctx->dentry);
1005 kfree(ctx);
1006 }
1007}
1008
1009/*
1010 * Ensure that mmap has a recent RPC credential for use when writing out
1011 * shared pages
1012 */
1013void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1014{
1015 struct inode *inode = filp->f_dentry->d_inode;
1016 struct nfs_inode *nfsi = NFS_I(inode);
1017
1018 filp->private_data = get_nfs_open_context(ctx);
1019 spin_lock(&inode->i_lock);
1020 list_add(&ctx->list, &nfsi->open_files);
1021 spin_unlock(&inode->i_lock);
1022}
1023
d530838b
TM		 1024/*
1025 * Given an inode, search for an open context with the desired characteristics
1026 */
1027struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
1da177e4
LT		 1028{
1029 struct nfs_inode *nfsi = NFS_I(inode);
1030 struct nfs_open_context *pos, *ctx = NULL;
1031
1032 spin_lock(&inode->i_lock);
1033 list_for_each_entry(pos, &nfsi->open_files, list) {
d530838b
TM		 1034 if (cred != NULL && pos->cred != cred)
1035 continue;
1da177e4
LT		 1036 if ((pos->mode & mode) == mode) {
1037 ctx = get_nfs_open_context(pos);
1038 break;
1039 }
1040 }
1041 spin_unlock(&inode->i_lock);
1042 return ctx;
1043}
1044
1045void nfs_file_clear_open_context(struct file *filp)
1046{
1047 struct inode *inode = filp->f_dentry->d_inode;
1048 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
1049
1050 if (ctx) {
1051 filp->private_data = NULL;
1052 spin_lock(&inode->i_lock);
1053 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1054 spin_unlock(&inode->i_lock);
1055 put_nfs_open_context(ctx);
1056 }
1057}
1058
1059/*
1060 * These allocate and release file read/write context information.
1061 */
1062int nfs_open(struct inode *inode, struct file *filp)
1063{
1064 struct nfs_open_context *ctx;
1065 struct rpc_cred *cred;
1066
1067 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1068 if (IS_ERR(cred))
1069 return PTR_ERR(cred);
1070 ctx = alloc_nfs_open_context(filp->f_dentry, cred);
1071 put_rpccred(cred);
1072 if (ctx == NULL)
1073 return -ENOMEM;
1074 ctx->mode = filp->f_mode;
1075 nfs_file_set_open_context(filp, ctx);
1076 put_nfs_open_context(ctx);
1da177e4
LT		 1077 return 0;
1078}
1079
1080int nfs_release(struct inode *inode, struct file *filp)
1081{
1da177e4
LT		 1082 nfs_file_clear_open_context(filp);
1083 return 0;
1084}
1085
1086/*
1087 * This function is called whenever some part of NFS notices that
1088 * the cached attributes have to be refreshed.
1089 */
1090int
1091__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1092{
1093 int status = -ESTALE;
1094 struct nfs_fattr fattr;
1095 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4
LT		 1096
1097 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1098 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1099
1100 lock_kernel();
1101 if (!inode || is_bad_inode(inode))
1102 goto out_nowait;
1103 if (NFS_STALE(inode))
1104 goto out_nowait;
1105
412d582e
CL		 1106 status = nfs_wait_on_inode(inode);
1107 if (status < 0)
1108 goto out;
1109 if (NFS_STALE(inode)) {
1110 status = -ESTALE;
1111 /* Do we trust the cached ESTALE? */
1112 if (NFS_ATTRTIMEO(inode) != 0) {
1113 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
1114 /* no */
1115 } else
1116 goto out;
1117 }
1da177e4 1118 }
1da177e4 1119
1da177e4
LT		 1120 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1121 if (status != 0) {
1122 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1123 inode->i_sb->s_id,
1124 (long long)NFS_FILEID(inode), status);
1125 if (status == -ESTALE) {
1126 nfs_zap_caches(inode);
1127 if (!S_ISDIR(inode->i_mode))
412d582e 1128 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1da177e4
LT		 1129 }
1130 goto out;
1131 }
1132
33801147 1133 spin_lock(&inode->i_lock);
24aa1fe6 1134 status = nfs_update_inode(inode, &fattr);
1da177e4 1135 if (status) {
33801147 1136 spin_unlock(&inode->i_lock);
1da177e4
LT		 1137 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1138 inode->i_sb->s_id,
1139 (long long)NFS_FILEID(inode), status);
1140 goto out;
1141 }
dc59250c 1142 spin_unlock(&inode->i_lock);
55296809 1143
7d52e862 1144 nfs_revalidate_mapping(inode, inode->i_mapping);
55296809 1145
24aa1fe6 1146 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1147 nfs_zap_acl_cache(inode);
55296809 1148
1da177e4
LT		 1149 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1150 inode->i_sb->s_id,
1151 (long long)NFS_FILEID(inode));
1152
412d582e
CL		 1153 out:
1154 nfs_wake_up_inode(inode);
1155
1da177e4
LT		 1156 out_nowait:
1157 unlock_kernel();
1158 return status;
1159}
1160
1161int nfs_attribute_timeout(struct inode *inode)
1162{
1163 struct nfs_inode *nfsi = NFS_I(inode);
1164
1165 if (nfs_have_delegation(inode, FMODE_READ))
1166 return 0;
1167 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1168}
1169
1170/**
1171 * nfs_revalidate_inode - Revalidate the inode attributes
1172 * @server - pointer to nfs_server struct
1173 * @inode - pointer to inode struct
1174 *
1175 * Updates inode attribute information by retrieving the data from the server.
1176 */
1177int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1178{
55296809 1179 if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1da177e4
LT		 1180 && !nfs_attribute_timeout(inode))
1181 return NFS_STALE(inode) ? -ESTALE : 0;
1182 return __nfs_revalidate_inode(server, inode);
1183}
1184
7d52e862
TM		 1185/**
1186 * nfs_revalidate_mapping - Revalidate the pagecache
1187 * @inode - pointer to host inode
1188 * @mapping - pointer to mapping
1189 */
1190void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1191{
1192 struct nfs_inode *nfsi = NFS_I(inode);
1193
55296809 1194 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
29884df0
TM		 1195 if (S_ISREG(inode->i_mode))
1196 nfs_sync_mapping(mapping);
7d52e862 1197 invalidate_inode_pages2(mapping);
dc59250c
CL		 1198
1199 spin_lock(&inode->i_lock);
55296809 1200 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
7d52e862
TM		 1201 if (S_ISDIR(inode->i_mode)) {
1202 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1203 /* This ensures we revalidate child dentries */
913a70fc 1204 nfsi->cache_change_attribute = jiffies;
7d52e862 1205 }
dc59250c
CL		 1206 spin_unlock(&inode->i_lock);
1207
7d52e862
TM		 1208 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1209 inode->i_sb->s_id,
1210 (long long)NFS_FILEID(inode));
1211 }
1212}
1213
1da177e4
LT		 1214/**
1215 * nfs_begin_data_update
1216 * @inode - pointer to inode
1217 * Declare that a set of operations will update file data on the server
1218 */
1219void nfs_begin_data_update(struct inode *inode)
1220{
1221 atomic_inc(&NFS_I(inode)->data_updates);
1222}
1223
1224/**
1225 * nfs_end_data_update
1226 * @inode - pointer to inode
1227 * Declare end of the operations that will update file data
1228 * This will mark the inode as immediately needing revalidation
1229 * of its attribute cache.
1230 */
1231void nfs_end_data_update(struct inode *inode)
1232{
1233 struct nfs_inode *nfsi = NFS_I(inode);
1234
1235 if (!nfs_have_delegation(inode, FMODE_READ)) {
decf491f
TM		 1236 /* Directories and symlinks: invalidate page cache */
1237 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
1238 spin_lock(&inode->i_lock);
55296809 1239 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
decf491f
TM		 1240 spin_unlock(&inode->i_lock);
1241 }
1da177e4 1242 }
913a70fc 1243 nfsi->cache_change_attribute = jiffies;
1da177e4
LT		 1244 atomic_dec(&nfsi->data_updates);
1245}
1246
a895b4a1
TM		 1247static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1248{
1249 struct nfs_inode *nfsi = NFS_I(inode);
1250
1251 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1252 && nfsi->change_attr == fattr->pre_change_attr) {
1253 nfsi->change_attr = fattr->change_attr;
1254 nfsi->cache_change_attribute = jiffies;
1255 }
1256
1257 /* If we have atomic WCC data, we may update some attributes */
1258 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1259 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1260 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1261 nfsi->cache_change_attribute = jiffies;
1262 }
1263 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1264 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1265 nfsi->cache_change_attribute = jiffies;
1266 }
1267 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
1268 inode->i_size = fattr->size;
1269 nfsi->cache_change_attribute = jiffies;
1270 }
1271 }
1272}
1273
1da177e4 1274/**
33801147 1275 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1da177e4
LT		 1276 * @inode - pointer to inode
1277 * @fattr - updated attributes
1278 *
1279 * Verifies the attribute cache. If we have just changed the attributes,
1280 * so that fattr carries weak cache consistency data, then it may
1281 * also update the ctime/mtime/change_attribute.
1282 */
33801147 1283static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1284{
1285 struct nfs_inode *nfsi = NFS_I(inode);
1286 loff_t cur_size, new_isize;
1287 int data_unstable;
1288
dc59250c 1289
a895b4a1
TM		 1290 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1291 return 0;
1292
1da177e4
LT		 1293 /* Are we in the process of updating data on the server? */
1294 data_unstable = nfs_caches_unstable(inode);
1295
a895b4a1
TM		 1296 /* Do atomic weak cache consistency updates */
1297 nfs_wcc_update_inode(inode, fattr);
1da177e4 1298
a895b4a1
TM		 1299 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
1300 nfsi->change_attr != fattr->change_attr) {
1301 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1302 if (!data_unstable)
1303 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
dc59250c 1304 }
1da177e4
LT		 1305
1306 /* Has the inode gone and changed behind our back? */
1307 if (nfsi->fileid != fattr->fileid
dc59250c 1308 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1da177e4 1309 return -EIO;
dc59250c 1310 }
1da177e4
LT		 1311
1312 cur_size = i_size_read(inode);
1313 new_isize = nfs_size_to_loff_t(fattr->size);
1314
1da177e4 1315 /* Verify a few of the more important attributes */
fe51beec 1316 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
55296809 1317 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
fe51beec 1318 if (!data_unstable)
55296809 1319 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
fe51beec
TM		 1320 }
1321 if (cur_size != new_isize) {
55296809 1322 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
fe51beec 1323 if (nfsi->npages == 0)
55296809 1324 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
fe51beec 1325 }
1da177e4
LT		 1326
1327 /* Have any file permissions changed? */
1328 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1329 || inode->i_uid != fattr->uid
1330 || inode->i_gid != fattr->gid)
55296809 1331 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1da177e4
LT		 1332
1333 /* Has the link count changed? */
1334 if (inode->i_nlink != fattr->nlink)
55296809 1335 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1da177e4
LT		 1336
1337 if (!timespec_equal(&inode->i_atime, &fattr->atime))
55296809 1338 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
1da177e4 1339
33801147 1340 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1341 return 0;
1342}
1343
33801147
TM		 1344/**
1345 * nfs_refresh_inode - try to update the inode attribute cache
1346 * @inode - pointer to inode
1347 * @fattr - updated attributes
1348 *
1349 * Check that an RPC call that returned attributes has not overlapped with
1350 * other recent updates of the inode metadata, then decide whether it is
1351 * safe to do a full update of the inode attributes, or whether just to
1352 * call nfs_check_inode_attributes.
1353 */
1354int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1355{
1356 struct nfs_inode *nfsi = NFS_I(inode);
1357 int status;
1358
1359 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1360 return 0;
1361 spin_lock(&inode->i_lock);
1362 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
33801147 1363 if (time_after(fattr->time_start, nfsi->last_updated))
24aa1fe6 1364 status = nfs_update_inode(inode, fattr);
33801147
TM		 1365 else
1366 status = nfs_check_inode_attributes(inode, fattr);
1367
1368 spin_unlock(&inode->i_lock);
1369 return status;
1370}
1371
decf491f
TM		 1372/**
1373 * nfs_post_op_update_inode - try to update the inode attribute cache
1374 * @inode - pointer to inode
1375 * @fattr - updated attributes
1376 *
1377 * After an operation that has changed the inode metadata, mark the
1378 * attribute cache as being invalid, then try to update it.
1379 */
1380int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1381{
1382 struct nfs_inode *nfsi = NFS_I(inode);
1383 int status = 0;
1384
1385 spin_lock(&inode->i_lock);
1386 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
1387 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
1388 goto out;
1389 }
24aa1fe6 1390 status = nfs_update_inode(inode, fattr);
decf491f
TM		 1391out:
1392 spin_unlock(&inode->i_lock);
1393 return status;
1394}
1395
1da177e4
LT		 1396/*
1397 * Many nfs protocol calls return the new file attributes after
1398 * an operation. Here we update the inode to reflect the state
1399 * of the server's inode.
1400 *
1401 * This is a bit tricky because we have to make sure all dirty pages
1402 * have been sent off to the server before calling invalidate_inode_pages.
1403 * To make sure no other process adds more write requests while we try
1404 * our best to flush them, we make them sleep during the attribute refresh.
1405 *
1406 * A very similar scenario holds for the dir cache.
1407 */
24aa1fe6 1408static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1409{
1410 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1411 loff_t cur_isize, new_isize;
1da177e4 1412 unsigned int invalid = 0;
24aa1fe6 1413 int data_stable;
1da177e4
LT		 1414
1415 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1416 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1417 atomic_read(&inode->i_count), fattr->valid);
1418
1419 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1420 return 0;
1421
325cfed9
CL		 1422 if (nfsi->fileid != fattr->fileid)
1423 goto out_fileid;
1da177e4
LT		 1424
1425 /*
1426 * Make sure the inode's type hasn't changed.
1427 */
33801147 1428 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1da177e4
LT		 1429 goto out_changed;
1430
1431 /*
1432 * Update the read time so we don't revalidate too often.
1433 */
33801147
TM		 1434 nfsi->read_cache_jiffies = fattr->time_start;
1435 nfsi->last_updated = jiffies;
1da177e4
LT		 1436
1437 /* Are we racing with known updates of the metadata on the server? */
24aa1fe6
TM		 1438 data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
1439 if (data_stable)
1440 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1da177e4 1441
a895b4a1
TM		 1442 /* Do atomic weak cache consistency updates */
1443 nfs_wcc_update_inode(inode, fattr);
1444
951a143b 1445 /* Check if our cached file size is stale */
1da177e4
LT		 1446 new_isize = nfs_size_to_loff_t(fattr->size);
1447 cur_isize = i_size_read(inode);
951a143b
TM		 1448 if (new_isize != cur_isize) {
1449 /* Do we perhaps have any outstanding writes? */
1450 if (nfsi->npages == 0) {
1451 /* No, but did we race with nfs_end_data_update()? */
24aa1fe6 1452 if (data_stable) {
1da177e4 1453 inode->i_size = new_isize;
951a143b 1454 invalid |= NFS_INO_INVALID_DATA;
1da177e4 1455 }
951a143b
TM		 1456 invalid |= NFS_INO_INVALID_ATTR;
1457 } else if (new_isize > cur_isize) {
1da177e4
LT		 1458 inode->i_size = new_isize;
1459 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1460 }
24aa1fe6 1461 nfsi->cache_change_attribute = jiffies;
951a143b
TM		 1462 dprintk("NFS: isize change on server for file %s/%ld\n",
1463 inode->i_sb->s_id, inode->i_ino);
1da177e4
LT		 1464 }
1465
951a143b 1466 /* Check if the mtime agrees */
1da177e4
LT		 1467 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1468 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
951a143b
TM		 1469 dprintk("NFS: mtime change on server for file %s/%ld\n",
1470 inode->i_sb->s_id, inode->i_ino);
24aa1fe6
TM		 1471 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1472 nfsi->cache_change_attribute = jiffies;
1da177e4
LT		 1473 }
1474
1475 if ((fattr->valid & NFS_ATTR_FATTR_V4)
1476 && nfsi->change_attr != fattr->change_attr) {
951a143b 1477 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1da177e4 1478 inode->i_sb->s_id, inode->i_ino);
1da177e4 1479 nfsi->change_attr = fattr->change_attr;
24aa1fe6
TM		 1480 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1481 nfsi->cache_change_attribute = jiffies;
1da177e4
LT		 1482 }
1483
ada70d94
TM		 1484 /* If ctime has changed we should definitely clear access+acl caches */
1485 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
24aa1fe6 1486 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
ada70d94 1487 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
24aa1fe6 1488 nfsi->cache_change_attribute = jiffies;
ada70d94 1489 }
1da177e4
LT		 1490 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1491
1492 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1493 inode->i_uid != fattr->uid ||
1494 inode->i_gid != fattr->gid)
ada70d94 1495 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1da177e4
LT		 1496
1497 inode->i_mode = fattr->mode;
1498 inode->i_nlink = fattr->nlink;
1499 inode->i_uid = fattr->uid;
1500 inode->i_gid = fattr->gid;
1501
1502 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1503 /*
1504 * report the blocks in 512byte units
1505 */
1506 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1507 inode->i_blksize = inode->i_sb->s_blocksize;
1508 } else {
1509 inode->i_blocks = fattr->du.nfs2.blocks;
1510 inode->i_blksize = fattr->du.nfs2.blocksize;
1511 }
1512
1513 /* Update attrtimeo value if we're out of the unstable period */
1514 if (invalid & NFS_INO_INVALID_ATTR) {
1515 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1516 nfsi->attrtimeo_timestamp = jiffies;
1517 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1518 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1519 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1520 nfsi->attrtimeo_timestamp = jiffies;
1521 }
1522 /* Don't invalidate the data if we were to blame */
1523 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1524 || S_ISLNK(inode->i_mode)))
1525 invalid &= ~NFS_INO_INVALID_DATA;
24aa1fe6
TM		 1526 if (data_stable)
1527 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
1da177e4 1528 if (!nfs_have_delegation(inode, FMODE_READ))
55296809 1529 nfsi->cache_validity |= invalid;
1da177e4
LT		 1530
1531 return 0;
1532 out_changed:
1533 /*
1534 * Big trouble! The inode has become a different object.
1535 */
1536#ifdef NFS_PARANOIA
1537 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1538 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1539#endif
b37b03b7 1540 out_err:
1da177e4
LT		 1541 /*
1542 * No need to worry about unhashing the dentry, as the
1543 * lookup validation will know that the inode is bad.
1544 * (But we fall through to invalidate the caches.)
1545 */
1546 nfs_invalidate_inode(inode);
1da177e4 1547 return -ESTALE;
325cfed9
CL		 1548
1549 out_fileid:
1550 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1551 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1552 NFS_SERVER(inode)->hostname, inode->i_sb->s_id,
1553 (long long)nfsi->fileid, (long long)fattr->fileid);
1554 goto out_err;
1da177e4
LT		 1555}
1556
1557/*
1558 * File system information
1559 */
1560
1561static int nfs_set_super(struct super_block *s, void *data)
1562{
1563 s->s_fs_info = data;
1564 return set_anon_super(s, data);
1565}
1566
1567static int nfs_compare_super(struct super_block *sb, void *data)
1568{
1569 struct nfs_server *server = data;
1570 struct nfs_server *old = NFS_SB(sb);
1571
1572 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1573 return 0;
1574 if (old->addr.sin_port != server->addr.sin_port)
1575 return 0;
1576 return !nfs_compare_fh(&old->fh, &server->fh);
1577}
1578
1579static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1580 int flags, const char *dev_name, void *raw_data)
1581{
1582 int error;
9085bbcb 1583 struct nfs_server *server = NULL;
1da177e4
LT		 1584 struct super_block *s;
1585 struct nfs_fh *root;
1586 struct nfs_mount_data *data = raw_data;
1587
9085bbcb
TM		 1588 s = ERR_PTR(-EINVAL);
1589 if (data == NULL) {
1590 dprintk("%s: missing data argument\n", __FUNCTION__);
1591 goto out_err;
1592 }
1593 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1594 dprintk("%s: bad mount version\n", __FUNCTION__);
1595 goto out_err;
1da177e4 1596 }
9085bbcb
TM		 1597 switch (data->version) {
1598 case 1:
1599 data->namlen = 0;
1600 case 2:
1601 data->bsize = 0;
1602 case 3:
1603 if (data->flags & NFS_MOUNT_VER3) {
1604 dprintk("%s: mount structure version %d does not support NFSv3\n",
1605 __FUNCTION__,
1606 data->version);
1607 goto out_err;
1608 }
1609 data->root.size = NFS2_FHSIZE;
1610 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1611 case 4:
1612 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1613 dprintk("%s: mount structure version %d does not support strong security\n",
1614 __FUNCTION__,
1615 data->version);
1616 goto out_err;
1617 }
1618 case 5:
1619 memset(data->context, 0, sizeof(data->context));
1620 }
1621#ifndef CONFIG_NFS_V3
1622 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1623 s = ERR_PTR(-EPROTONOSUPPORT);
1624 if (data->flags & NFS_MOUNT_VER3) {
1625 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1626 goto out_err;
1627 }
1628#endif /* CONFIG_NFS_V3 */
1da177e4 1629
9085bbcb 1630 s = ERR_PTR(-ENOMEM);
1da177e4
LT		 1631 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1632 if (!server)
9085bbcb 1633 goto out_err;
1da177e4
LT		 1634 memset(server, 0, sizeof(struct nfs_server));
1635 /* Zero out the NFS state stuff */
1636 init_nfsv4_state(server);
b7fa0554 1637 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1da177e4 1638
1da177e4
LT		 1639 root = &server->fh;
1640 if (data->flags & NFS_MOUNT_VER3)
1641 root->size = data->root.size;
1642 else
1643 root->size = NFS2_FHSIZE;
9085bbcb 1644 s = ERR_PTR(-EINVAL);
1da177e4 1645 if (root->size > sizeof(root->data)) {
9085bbcb
TM		 1646 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1647 goto out_err;
1da177e4
LT		 1648 }
1649 memcpy(root->data, data->root.data, root->size);
1650
1651 /* We now require that the mount process passes the remote address */
1652 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1653 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
9085bbcb
TM		 1654 dprintk("%s: mount program didn't pass remote address!\n",
1655 __FUNCTION__);
1656 goto out_err;
1da177e4
LT		 1657 }
1658
9085bbcb
TM		 1659 /* Fire up rpciod if not yet running */
1660 s = ERR_PTR(rpciod_up());
1661 if (IS_ERR(s)) {
1662 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1663 __FUNCTION__, PTR_ERR(s));
1664 goto out_err;
1da177e4
LT		 1665 }
1666
9085bbcb
TM		 1667 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1668 if (IS_ERR(s) || s->s_root)
1669 goto out_rpciod_down;
1da177e4 1670
9085bbcb 1671 s->s_flags = flags;
1da177e4
LT		 1672
1673 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1674 if (error) {
1675 up_write(&s->s_umount);
1676 deactivate_super(s);
1677 return ERR_PTR(error);
1678 }
1679 s->s_flags |= MS_ACTIVE;
1680 return s;
9085bbcb
TM		 1681out_rpciod_down:
1682 rpciod_down();
1683out_err:
1684 kfree(server);
1685 return s;
1da177e4
LT		 1686}
1687
1688static void nfs_kill_super(struct super_block *s)
1689{
1690 struct nfs_server *server = NFS_SB(s);
1691
1692 kill_anon_super(s);
1693
6a19275a 1694 if (!IS_ERR(server->client))
1da177e4 1695 rpc_shutdown_client(server->client);
6a19275a 1696 if (!IS_ERR(server->client_sys))
1da177e4 1697 rpc_shutdown_client(server->client_sys);
b7fa0554
AG		 1698 if (!IS_ERR(server->client_acl))
1699 rpc_shutdown_client(server->client_acl);
1da177e4
LT		 1700
1701 if (!(server->flags & NFS_MOUNT_NONLM))
1702 lockd_down(); /* release rpc.lockd */
1703
1704 rpciod_down(); /* release rpciod */
1705
f99d49ad 1706 kfree(server->hostname);
1da177e4
LT		 1707 kfree(server);
1708}
1709
1710static struct file_system_type nfs_fs_type = {
1711 .owner = THIS_MODULE,
1712 .name = "nfs",
1713 .get_sb = nfs_get_sb,
1714 .kill_sb = nfs_kill_super,
1715 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1716};
1717
1718#ifdef CONFIG_NFS_V4
1719
1720static void nfs4_clear_inode(struct inode *);
1721
1722
1723static struct super_operations nfs4_sops = {
1724 .alloc_inode = nfs_alloc_inode,
1725 .destroy_inode = nfs_destroy_inode,
1726 .write_inode = nfs_write_inode,
1727 .delete_inode = nfs_delete_inode,
1728 .statfs = nfs_statfs,
1729 .clear_inode = nfs4_clear_inode,
1730 .umount_begin = nfs_umount_begin,
1731 .show_options = nfs_show_options,
1732};
1733
1734/*
1735 * Clean out any remaining NFSv4 state that might be left over due
1736 * to open() calls that passed nfs_atomic_lookup, but failed to call
1737 * nfs_open().
1738 */
1739static void nfs4_clear_inode(struct inode *inode)
1740{
1741 struct nfs_inode *nfsi = NFS_I(inode);
1742
1743 /* If we are holding a delegation, return it! */
cae7a073 1744 nfs_inode_return_delegation(inode);
1da177e4
LT		 1745 /* First call standard NFS clear_inode() code */
1746 nfs_clear_inode(inode);
1747 /* Now clear out any remaining state */
1748 while (!list_empty(&nfsi->open_states)) {
1749 struct nfs4_state *state;
1750
1751 state = list_entry(nfsi->open_states.next,
1752 struct nfs4_state,
1753 inode_states);
1754 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1755 __FUNCTION__,
1756 inode->i_sb->s_id,
1757 (long long)NFS_FILEID(inode),
1758 state);
1759 BUG_ON(atomic_read(&state->count) != 1);
1760 nfs4_close_state(state, state->state);
1761 }
1762}
1763
1764
1765static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1766{
1767 struct nfs_server *server;
1768 struct nfs4_client *clp = NULL;
1769 struct rpc_xprt *xprt = NULL;
1770 struct rpc_clnt *clnt = NULL;
1771 struct rpc_timeout timeparms;
1772 rpc_authflavor_t authflavour;
eab5c084 1773 int err = -EIO;
1da177e4
LT		 1774
1775 sb->s_blocksize_bits = 0;
1776 sb->s_blocksize = 0;
1777 server = NFS_SB(sb);
1778 if (data->rsize != 0)
1779 server->rsize = nfs_block_size(data->rsize, NULL);
1780 if (data->wsize != 0)
1781 server->wsize = nfs_block_size(data->wsize, NULL);
1782 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1783 server->caps = NFS_CAP_ATOMIC_OPEN;
1784
1785 server->acregmin = data->acregmin*HZ;
1786 server->acregmax = data->acregmax*HZ;
1787 server->acdirmin = data->acdirmin*HZ;
1788 server->acdirmax = data->acdirmax*HZ;
1789
1790 server->rpc_ops = &nfs_v4_clientops;
1da177e4 1791
eab5c084 1792 nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1da177e4
LT		 1793
1794 clp = nfs4_get_client(&server->addr.sin_addr);
1795 if (!clp) {
9085bbcb 1796 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1da177e4
LT		 1797 return -EIO;
1798 }
1799
1800 /* Now create transport and client */
1801 authflavour = RPC_AUTH_UNIX;
1802 if (data->auth_flavourlen != 0) {
9085bbcb
TM		 1803 if (data->auth_flavourlen != 1) {
1804 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1805 __FUNCTION__, data->auth_flavourlen);
1806 err = -EINVAL;
1807 goto out_fail;
1808 }
1da177e4
LT		 1809 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1810 err = -EFAULT;
1811 goto out_fail;
1812 }
1813 }
1814
1815 down_write(&clp->cl_sem);
6a19275a 1816 if (IS_ERR(clp->cl_rpcclient)) {
eab5c084 1817 xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
1da177e4
LT		 1818 if (IS_ERR(xprt)) {
1819 up_write(&clp->cl_sem);
1da177e4 1820 err = PTR_ERR(xprt);
9085bbcb
TM		 1821 dprintk("%s: cannot create RPC transport. Error = %d\n",
1822 __FUNCTION__, err);
1da177e4
LT		 1823 goto out_fail;
1824 }
1825 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1826 server->rpc_ops->version, authflavour);
1827 if (IS_ERR(clnt)) {
1828 up_write(&clp->cl_sem);
1da177e4 1829 err = PTR_ERR(clnt);
9085bbcb
TM		 1830 dprintk("%s: cannot create RPC client. Error = %d\n",
1831 __FUNCTION__, err);
1da177e4
LT		 1832 goto out_fail;
1833 }
1834 clnt->cl_intr = 1;
1835 clnt->cl_softrtry = 1;
1da177e4 1836 clp->cl_rpcclient = clnt;
1da177e4
LT		 1837 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1838 nfs_idmap_new(clp);
1839 }
1da177e4
LT		 1840 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1841 clnt = rpc_clone_client(clp->cl_rpcclient);
1842 if (!IS_ERR(clnt))
1843 server->nfs4_state = clp;
1844 up_write(&clp->cl_sem);
1845 clp = NULL;
1846
1847 if (IS_ERR(clnt)) {
9085bbcb
TM		 1848 err = PTR_ERR(clnt);
1849 dprintk("%s: cannot create RPC client. Error = %d\n",
1850 __FUNCTION__, err);
1851 return err;
1da177e4
LT		 1852 }
1853
1854 server->client = clnt;
1855
1856 if (server->nfs4_state->cl_idmap == NULL) {
9085bbcb 1857 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1da177e4
LT		 1858 return -ENOMEM;
1859 }
1860
1861 if (clnt->cl_auth->au_flavor != authflavour) {
6a19275a
BF		 1862 struct rpc_auth *auth;
1863
1864 auth = rpcauth_create(authflavour, clnt);
1865 if (IS_ERR(auth)) {
9085bbcb 1866 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
6a19275a 1867 return PTR_ERR(auth);
1da177e4
LT		 1868 }
1869 }
1870
1871 sb->s_time_gran = 1;
1872
1873 sb->s_op = &nfs4_sops;
1874 err = nfs_sb_init(sb, authflavour);
1875 if (err == 0)
1876 return 0;
1877out_fail:
1878 if (clp)
1879 nfs4_put_client(clp);
1880 return err;
1881}
1882
1883static int nfs4_compare_super(struct super_block *sb, void *data)
1884{
1885 struct nfs_server *server = data;
1886 struct nfs_server *old = NFS_SB(sb);
1887
1888 if (strcmp(server->hostname, old->hostname) != 0)
1889 return 0;
1890 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1891 return 0;
1892 return 1;
1893}
1894
1895static void *
1896nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1897{
1898 void *p = NULL;
1899
1900 if (!src->len)
1901 return ERR_PTR(-EINVAL);
1902 if (src->len < maxlen)
1903 maxlen = src->len;
1904 if (dst == NULL) {
1905 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1906 if (p == NULL)
1907 return ERR_PTR(-ENOMEM);
1908 }
1909 if (copy_from_user(dst, src->data, maxlen)) {
f99d49ad 1910 kfree(p);
1da177e4
LT		 1911 return ERR_PTR(-EFAULT);
1912 }
1913 dst[maxlen] = '\0';
1914 return dst;
1915}
1916
1917static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1918 int flags, const char *dev_name, void *raw_data)
1919{
1920 int error;
1921 struct nfs_server *server;
1922 struct super_block *s;
1923 struct nfs4_mount_data *data = raw_data;
1924 void *p;
1925
9085bbcb
TM		 1926 if (data == NULL) {
1927 dprintk("%s: missing data argument\n", __FUNCTION__);
1928 return ERR_PTR(-EINVAL);
1929 }
1930 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1931 dprintk("%s: bad mount version\n", __FUNCTION__);
1da177e4
LT		 1932 return ERR_PTR(-EINVAL);
1933 }
1934
1935 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1936 if (!server)
1937 return ERR_PTR(-ENOMEM);
1938 memset(server, 0, sizeof(struct nfs_server));
1939 /* Zero out the NFS state stuff */
1940 init_nfsv4_state(server);
b7fa0554 1941 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1da177e4 1942
1da177e4
LT		 1943 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1944 if (IS_ERR(p))
1945 goto out_err;
1946 server->hostname = p;
1947
1948 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1949 if (IS_ERR(p))
1950 goto out_err;
1951 server->mnt_path = p;
1952
1953 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1954 sizeof(server->ip_addr) - 1);
1955 if (IS_ERR(p))
1956 goto out_err;
1957
1958 /* We now require that the mount process passes the remote address */
1959 if (data->host_addrlen != sizeof(server->addr)) {
1960 s = ERR_PTR(-EINVAL);
1961 goto out_free;
1962 }
1963 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1964 s = ERR_PTR(-EFAULT);
1965 goto out_free;
1966 }
1967 if (server->addr.sin_family != AF_INET ||
1968 server->addr.sin_addr.s_addr == INADDR_ANY) {
9085bbcb
TM		 1969 dprintk("%s: mount program didn't pass remote IP address!\n",
1970 __FUNCTION__);
1da177e4
LT		 1971 s = ERR_PTR(-EINVAL);
1972 goto out_free;
1973 }
1974
9085bbcb
TM		 1975 /* Fire up rpciod if not yet running */
1976 s = ERR_PTR(rpciod_up());
1977 if (IS_ERR(s)) {
1978 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1979 __FUNCTION__, PTR_ERR(s));
1980 goto out_free;
1981 }
1982
1da177e4
LT		 1983 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1984
1985 if (IS_ERR(s) || s->s_root)
1986 goto out_free;
1987
1988 s->s_flags = flags;
1989
1da177e4
LT		 1990 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1991 if (error) {
1992 up_write(&s->s_umount);
1993 deactivate_super(s);
1994 return ERR_PTR(error);
1995 }
1996 s->s_flags |= MS_ACTIVE;
1997 return s;
1998out_err:
1999 s = (struct super_block *)p;
2000out_free:
f99d49ad
JJ		 2001 kfree(server->mnt_path);
2002 kfree(server->hostname);
1da177e4
LT		 2003 kfree(server);
2004 return s;
2005}
2006
2007static void nfs4_kill_super(struct super_block *sb)
2008{
2009 struct nfs_server *server = NFS_SB(sb);
2010
2011 nfs_return_all_delegations(sb);
2012 kill_anon_super(sb);
2013
2014 nfs4_renewd_prepare_shutdown(server);
2015
2016 if (server->client != NULL && !IS_ERR(server->client))
2017 rpc_shutdown_client(server->client);
2018 rpciod_down(); /* release rpciod */
2019
2020 destroy_nfsv4_state(server);
2021
f99d49ad 2022 kfree(server->hostname);
1da177e4
LT		 2023 kfree(server);
2024}
2025
2026static struct file_system_type nfs4_fs_type = {
2027 .owner = THIS_MODULE,
2028 .name = "nfs4",
2029 .get_sb = nfs4_get_sb,
2030 .kill_sb = nfs4_kill_super,
2031 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
2032};
2033
a72b4422
TM		 2034static const int nfs_set_port_min = 0;
2035static const int nfs_set_port_max = 65535;
2036static int param_set_port(const char *val, struct kernel_param *kp)
2037{
2038 char *endp;
2039 int num = simple_strtol(val, &endp, 0);
2040 if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
2041 return -EINVAL;
2042 *((int *)kp->arg) = num;
2043 return 0;
2044}
2045
2046module_param_call(callback_tcpport, param_set_port, param_get_int,
2047 &nfs_callback_set_tcpport, 0644);
2048
58df095b
TM		 2049static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
2050{
2051 char *endp;
2052 int num = simple_strtol(val, &endp, 0);
2053 int jif = num * HZ;
2054 if (endp == val || *endp || num < 0 || jif < num)
2055 return -EINVAL;
2056 *((int *)kp->arg) = jif;
2057 return 0;
2058}
2059
2060module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
2061 &nfs_idmap_cache_timeout, 0644);
2062
1da177e4
LT		 2063#define nfs4_init_once(nfsi) \
2064 do { \
2065 INIT_LIST_HEAD(&(nfsi)->open_states); \
2066 nfsi->delegation = NULL; \
2067 nfsi->delegation_state = 0; \
2068 init_rwsem(&nfsi->rwsem); \
2069 } while(0)
a72b4422
TM		 2070
2071static inline int register_nfs4fs(void)
2072{
2073 int ret;
2074
2075 ret = nfs_register_sysctl();
2076 if (ret != 0)
2077 return ret;
2078 ret = register_filesystem(&nfs4_fs_type);
2079 if (ret != 0)
2080 nfs_unregister_sysctl();
2081 return ret;
2082}
2083
2084static inline void unregister_nfs4fs(void)
2085{
2086 unregister_filesystem(&nfs4_fs_type);
2087 nfs_unregister_sysctl();
2088}
1da177e4
LT		 2089#else
2090#define nfs4_init_once(nfsi) \
2091 do { } while (0)
2092#define register_nfs4fs() (0)
2093#define unregister_nfs4fs()
2094#endif
2095
2096extern int nfs_init_nfspagecache(void);
2097extern void nfs_destroy_nfspagecache(void);
2098extern int nfs_init_readpagecache(void);
2099extern void nfs_destroy_readpagecache(void);
2100extern int nfs_init_writepagecache(void);
2101extern void nfs_destroy_writepagecache(void);
2102#ifdef CONFIG_NFS_DIRECTIO
2103extern int nfs_init_directcache(void);
2104extern void nfs_destroy_directcache(void);
2105#endif
2106
2107static kmem_cache_t * nfs_inode_cachep;
2108
2109static struct inode *nfs_alloc_inode(struct super_block *sb)
2110{
2111 struct nfs_inode *nfsi;
2112 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
2113 if (!nfsi)
2114 return NULL;
55296809
CL		 2115 nfsi->flags = 0UL;
2116 nfsi->cache_validity = 0UL;
223db122 2117 nfsi->cache_change_attribute = jiffies;
458818ed
TM		 2118#ifdef CONFIG_NFS_V3_ACL
2119 nfsi->acl_access = ERR_PTR(-EAGAIN);
2120 nfsi->acl_default = ERR_PTR(-EAGAIN);
2121#endif
e50a1c2e
BF		 2122#ifdef CONFIG_NFS_V4
2123 nfsi->nfs4_acl = NULL;
2124#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 2125 return &nfsi->vfs_inode;
2126}
2127
2128static void nfs_destroy_inode(struct inode *inode)
2129{
2130 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2131}
2132
2133static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
2134{
2135 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2136
2137 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2138 SLAB_CTOR_CONSTRUCTOR) {
2139 inode_init_once(&nfsi->vfs_inode);
2140 spin_lock_init(&nfsi->req_lock);
2141 INIT_LIST_HEAD(&nfsi->dirty);
2142 INIT_LIST_HEAD(&nfsi->commit);
2143 INIT_LIST_HEAD(&nfsi->open_files);
2144 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
2145 atomic_set(&nfsi->data_updates, 0);
2146 nfsi->ndirty = 0;
2147 nfsi->ncommit = 0;
2148 nfsi->npages = 0;
1da177e4
LT		 2149 nfs4_init_once(nfsi);
2150 }
2151}
2152
75c96f85 2153static int nfs_init_inodecache(void)
1da177e4
LT		 2154{
2155 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2156 sizeof(struct nfs_inode),
2157 0, SLAB_RECLAIM_ACCOUNT,
2158 init_once, NULL);
2159 if (nfs_inode_cachep == NULL)
2160 return -ENOMEM;
2161
2162 return 0;
2163}
2164
75c96f85 2165static void nfs_destroy_inodecache(void)
1da177e4
LT		 2166{
2167 if (kmem_cache_destroy(nfs_inode_cachep))
2168 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
2169}
2170
2171/*
2172 * Initialize NFS
2173 */
2174static int __init init_nfs_fs(void)
2175{
2176 int err;
2177
2178 err = nfs_init_nfspagecache();
2179 if (err)
2180 goto out4;
2181
2182 err = nfs_init_inodecache();
2183 if (err)
2184 goto out3;
2185
2186 err = nfs_init_readpagecache();
2187 if (err)
2188 goto out2;
2189
2190 err = nfs_init_writepagecache();
2191 if (err)
2192 goto out1;
2193
2194#ifdef CONFIG_NFS_DIRECTIO
2195 err = nfs_init_directcache();
2196 if (err)
2197 goto out0;
2198#endif
2199
2200#ifdef CONFIG_PROC_FS
2201 rpc_proc_register(&nfs_rpcstat);
2202#endif
2203 err = register_filesystem(&nfs_fs_type);
2204 if (err)
2205 goto out;
2206 if ((err = register_nfs4fs()) != 0)
2207 goto out;
2208 return 0;
2209out:
2210#ifdef CONFIG_PROC_FS
2211 rpc_proc_unregister("nfs");
2212#endif
1da177e4 2213#ifdef CONFIG_NFS_DIRECTIO
1da177e4 2214 nfs_destroy_directcache();
6b59a754 2215out0:
1da177e4 2216#endif
6b59a754 2217 nfs_destroy_writepagecache();
1da177e4
LT		 2218out1:
2219 nfs_destroy_readpagecache();
2220out2:
2221 nfs_destroy_inodecache();
2222out3:
2223 nfs_destroy_nfspagecache();
2224out4:
2225 return err;
2226}
2227
2228static void __exit exit_nfs_fs(void)
2229{
2230#ifdef CONFIG_NFS_DIRECTIO
2231 nfs_destroy_directcache();
2232#endif
2233 nfs_destroy_writepagecache();
2234 nfs_destroy_readpagecache();
2235 nfs_destroy_inodecache();
2236 nfs_destroy_nfspagecache();
2237#ifdef CONFIG_PROC_FS
2238 rpc_proc_unregister("nfs");
2239#endif
2240 unregister_filesystem(&nfs_fs_type);
2241 unregister_nfs4fs();
2242}
2243
2244/* Not quite true; I just maintain it */
2245MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2246MODULE_LICENSE("GPL");
2247
2248module_init(init_nfs_fs)
2249module_exit(exit_nfs_fs)
Linux kernel - Deliverables
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