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[PATCH] Fix JBD race in t_forget list handling
[linux-2.6/openmoko-kernel/knife-kernel.git] / fs / nfs / inode.c
blob541b418327c8b18b8f30d294beca9c10d3ca732e
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
42 #include "nfs4_fs.h"
43 #include "delegation.h"
44
45 #define NFSDBG_FACILITY NFSDBG_VFS
46 #define NFS_PARANOIA 1
47
48 /* Maximum number of readahead requests
49 * FIXME: this should really be a sysctl so that users may tune it to suit
50 * their needs. People that do NFS over a slow network, might for
51 * instance want to reduce it to something closer to 1 for improved
52 * interactive response.
53 */
54 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
55
56 static void nfs_invalidate_inode(struct inode *);
57 static int nfs_update_inode(struct inode *, struct nfs_fattr *, unsigned long);
58
59 static struct inode *nfs_alloc_inode(struct super_block *sb);
60 static void nfs_destroy_inode(struct inode *);
61 static int nfs_write_inode(struct inode *,int);
62 static void nfs_delete_inode(struct inode *);
63 static void nfs_clear_inode(struct inode *);
64 static void nfs_umount_begin(struct super_block *);
65 static int nfs_statfs(struct super_block *, struct kstatfs *);
66 static int nfs_show_options(struct seq_file *, struct vfsmount *);
67 static void nfs_zap_acl_cache(struct inode *);
68
69 static struct rpc_program nfs_program;
70
71 static struct super_operations nfs_sops = {
72 .alloc_inode = nfs_alloc_inode,
73 .destroy_inode = nfs_destroy_inode,
74 .write_inode = nfs_write_inode,
75 .delete_inode = nfs_delete_inode,
76 .statfs = nfs_statfs,
77 .clear_inode = nfs_clear_inode,
78 .umount_begin = nfs_umount_begin,
79 .show_options = nfs_show_options,
80 };
81
82 /*
83 * RPC cruft for NFS
84 */
85 static struct rpc_stat nfs_rpcstat = {
86 .program = &nfs_program
87 };
88 static struct rpc_version * nfs_version[] = {
89 NULL,
90 NULL,
91 &nfs_version2,
92 #if defined(CONFIG_NFS_V3)
93 &nfs_version3,
94 #elif defined(CONFIG_NFS_V4)
95 NULL,
96 #endif
97 #if defined(CONFIG_NFS_V4)
98 &nfs_version4,
99 #endif
100 };
101
102 static struct rpc_program nfs_program = {
103 .name = "nfs",
104 .number = NFS_PROGRAM,
105 .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
106 .version = nfs_version,
107 .stats = &nfs_rpcstat,
108 .pipe_dir_name = "/nfs",
109 };
110
111 #ifdef CONFIG_NFS_V3_ACL
112 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
113 static struct rpc_version * nfsacl_version[] = {
114 [3] = &nfsacl_version3,
115 };
116
117 struct rpc_program nfsacl_program = {
118 .name = "nfsacl",
119 .number = NFS_ACL_PROGRAM,
120 .nrvers = sizeof(nfsacl_version) / sizeof(nfsacl_version[0]),
121 .version = nfsacl_version,
122 .stats = &nfsacl_rpcstat,
123 };
124 #endif /* CONFIG_NFS_V3_ACL */
125
126 static inline unsigned long
127 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
128 {
129 return nfs_fileid_to_ino_t(fattr->fileid);
130 }
131
132 static int
133 nfs_write_inode(struct inode *inode, int sync)
134 {
135 int flags = sync ? FLUSH_WAIT : 0;
136 int ret;
137
138 ret = nfs_commit_inode(inode, flags);
139 if (ret < 0)
140 return ret;
141 return 0;
142 }
143
144 static void
145 nfs_delete_inode(struct inode * inode)
146 {
147 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
148
149 nfs_wb_all(inode);
150 /*
151 * The following should never happen...
152 */
153 if (nfs_have_writebacks(inode)) {
154 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
155 }
156
157 clear_inode(inode);
158 }
159
160 static void
161 nfs_clear_inode(struct inode *inode)
162 {
163 struct nfs_inode *nfsi = NFS_I(inode);
164 struct rpc_cred *cred;
165
166 nfs_wb_all(inode);
167 BUG_ON (!list_empty(&nfsi->open_files));
168 nfs_zap_acl_cache(inode);
169 cred = nfsi->cache_access.cred;
170 if (cred)
171 put_rpccred(cred);
172 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
173 }
174
175 void
176 nfs_umount_begin(struct super_block *sb)
177 {
178 struct rpc_clnt *rpc = NFS_SB(sb)->client;
179
180 /* -EIO all pending I/O */
181 if (!IS_ERR(rpc))
182 rpc_killall_tasks(rpc);
183 rpc = NFS_SB(sb)->client_acl;
184 if (!IS_ERR(rpc))
185 rpc_killall_tasks(rpc);
186 }
187
188
189 static inline unsigned long
190 nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
191 {
192 /* make sure blocksize is a power of two */
193 if ((bsize & (bsize - 1)) || nrbitsp) {
194 unsigned char nrbits;
195
196 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
197 ;
198 bsize = 1 << nrbits;
199 if (nrbitsp)
200 *nrbitsp = nrbits;
201 }
202
203 return bsize;
204 }
205
206 /*
207 * Calculate the number of 512byte blocks used.
208 */
209 static inline unsigned long
210 nfs_calc_block_size(u64 tsize)
211 {
212 loff_t used = (tsize + 511) >> 9;
213 return (used > ULONG_MAX) ? ULONG_MAX : used;
214 }
215
216 /*
217 * Compute and set NFS server blocksize
218 */
219 static inline unsigned long
220 nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
221 {
222 if (bsize < 1024)
223 bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
224 else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
225 bsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
226
227 return nfs_block_bits(bsize, nrbitsp);
228 }
229
230 /*
231 * Obtain the root inode of the file system.
232 */
233 static struct inode *
234 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
235 {
236 struct nfs_server *server = NFS_SB(sb);
237 struct inode *rooti;
238 int error;
239
240 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
241 if (error < 0) {
242 dprintk("nfs_get_root: getattr error = %d\n", -error);
243 return ERR_PTR(error);
244 }
245
246 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
247 if (!rooti)
248 return ERR_PTR(-ENOMEM);
249 return rooti;
250 }
251
252 /*
253 * Do NFS version-independent mount processing, and sanity checking
254 */
255 static int
256 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
257 {
258 struct nfs_server *server;
259 struct inode *root_inode;
260 struct nfs_fattr fattr;
261 struct nfs_fsinfo fsinfo = {
262 .fattr = &fattr,
263 };
264 struct nfs_pathconf pathinfo = {
265 .fattr = &fattr,
266 };
267 int no_root_error = 0;
268 unsigned long max_rpc_payload;
269
270 /* We probably want something more informative here */
271 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
272
273 server = NFS_SB(sb);
274
275 sb->s_magic = NFS_SUPER_MAGIC;
276
277 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
278 /* Did getting the root inode fail? */
279 if (IS_ERR(root_inode)) {
280 no_root_error = PTR_ERR(root_inode);
281 goto out_no_root;
282 }
283 sb->s_root = d_alloc_root(root_inode);
284 if (!sb->s_root) {
285 no_root_error = -ENOMEM;
286 goto out_no_root;
287 }
288 sb->s_root->d_op = server->rpc_ops->dentry_ops;
289
290 /* Get some general file system info */
291 if (server->namelen == 0 &&
292 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
293 server->namelen = pathinfo.max_namelen;
294 /* Work out a lot of parameters */
295 if (server->rsize == 0)
296 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
297 if (server->wsize == 0)
298 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
299
300 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
301 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
302 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
303 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
304
305 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
306 if (server->rsize > max_rpc_payload)
307 server->rsize = max_rpc_payload;
308 if (server->wsize > max_rpc_payload)
309 server->wsize = max_rpc_payload;
310
311 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
312 if (server->rpages > NFS_READ_MAXIOV) {
313 server->rpages = NFS_READ_MAXIOV;
314 server->rsize = server->rpages << PAGE_CACHE_SHIFT;
315 }
316
317 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
318 if (server->wpages > NFS_WRITE_MAXIOV) {
319 server->wpages = NFS_WRITE_MAXIOV;
320 server->wsize = server->wpages << PAGE_CACHE_SHIFT;
321 }
322
323 if (sb->s_blocksize == 0)
324 sb->s_blocksize = nfs_block_bits(server->wsize,
325 &sb->s_blocksize_bits);
326 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
327
328 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
329 if (server->dtsize > PAGE_CACHE_SIZE)
330 server->dtsize = PAGE_CACHE_SIZE;
331 if (server->dtsize > server->rsize)
332 server->dtsize = server->rsize;
333
334 if (server->flags & NFS_MOUNT_NOAC) {
335 server->acregmin = server->acregmax = 0;
336 server->acdirmin = server->acdirmax = 0;
337 sb->s_flags |= MS_SYNCHRONOUS;
338 }
339 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
340
341 sb->s_maxbytes = fsinfo.maxfilesize;
342 if (sb->s_maxbytes > MAX_LFS_FILESIZE)
343 sb->s_maxbytes = MAX_LFS_FILESIZE;
344
345 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
346 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
347
348 /* We're airborne Set socket buffersize */
349 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
350 return 0;
351 /* Yargs. It didn't work out. */
352 out_no_root:
353 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
354 if (!IS_ERR(root_inode))
355 iput(root_inode);
356 return no_root_error;
357 }
358
359 /*
360 * Create an RPC client handle.
361 */
362 static struct rpc_clnt *
363 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
364 {
365 struct rpc_timeout timeparms;
366 struct rpc_xprt *xprt = NULL;
367 struct rpc_clnt *clnt = NULL;
368 int tcp = (data->flags & NFS_MOUNT_TCP);
369
370 /* Initialize timeout values */
371 timeparms.to_initval = data->timeo * HZ / 10;
372 timeparms.to_retries = data->retrans;
373 timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT;
374 timeparms.to_exponential = 1;
375
376 if (!timeparms.to_initval)
377 timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10;
378 if (!timeparms.to_retries)
379 timeparms.to_retries = 5;
380
381 /* create transport and client */
382 xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP,
383 &server->addr, &timeparms);
384 if (IS_ERR(xprt)) {
385 dprintk("%s: cannot create RPC transport. Error = %ld\n",
386 __FUNCTION__, PTR_ERR(xprt));
387 return (struct rpc_clnt *)xprt;
388 }
389 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
390 server->rpc_ops->version, data->pseudoflavor);
391 if (IS_ERR(clnt)) {
392 dprintk("%s: cannot create RPC client. Error = %ld\n",
393 __FUNCTION__, PTR_ERR(xprt));
394 goto out_fail;
395 }
396
397 clnt->cl_intr = 1;
398 clnt->cl_softrtry = 1;
399 clnt->cl_chatty = 1;
400
401 return clnt;
402
403 out_fail:
404 return clnt;
405 }
406
407 /*
408 * The way this works is that the mount process passes a structure
409 * in the data argument which contains the server's IP address
410 * and the root file handle obtained from the server's mount
411 * daemon. We stash these away in the private superblock fields.
412 */
413 static int
414 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
415 {
416 struct nfs_server *server;
417 rpc_authflavor_t authflavor;
418
419 server = NFS_SB(sb);
420 sb->s_blocksize_bits = 0;
421 sb->s_blocksize = 0;
422 if (data->bsize)
423 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
424 if (data->rsize)
425 server->rsize = nfs_block_size(data->rsize, NULL);
426 if (data->wsize)
427 server->wsize = nfs_block_size(data->wsize, NULL);
428 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
429
430 server->acregmin = data->acregmin*HZ;
431 server->acregmax = data->acregmax*HZ;
432 server->acdirmin = data->acdirmin*HZ;
433 server->acdirmax = data->acdirmax*HZ;
434
435 /* Start lockd here, before we might error out */
436 if (!(server->flags & NFS_MOUNT_NONLM))
437 lockd_up();
438
439 server->namelen = data->namlen;
440 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
441 if (!server->hostname)
442 return -ENOMEM;
443 strcpy(server->hostname, data->hostname);
444
445 /* Check NFS protocol revision and initialize RPC op vector
446 * and file handle pool. */
447 #ifdef CONFIG_NFS_V3
448 if (server->flags & NFS_MOUNT_VER3) {
449 server->rpc_ops = &nfs_v3_clientops;
450 server->caps |= NFS_CAP_READDIRPLUS;
451 } else {
452 server->rpc_ops = &nfs_v2_clientops;
453 }
454 #else
455 server->rpc_ops = &nfs_v2_clientops;
456 #endif
457
458 /* Fill in pseudoflavor for mount version < 5 */
459 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
460 data->pseudoflavor = RPC_AUTH_UNIX;
461 authflavor = data->pseudoflavor; /* save for sb_init() */
462 /* XXX maybe we want to add a server->pseudoflavor field */
463
464 /* Create RPC client handles */
465 server->client = nfs_create_client(server, data);
466 if (IS_ERR(server->client))
467 return PTR_ERR(server->client);
468 /* RFC 2623, sec 2.3.2 */
469 if (authflavor != RPC_AUTH_UNIX) {
470 struct rpc_auth *auth;
471
472 server->client_sys = rpc_clone_client(server->client);
473 if (IS_ERR(server->client_sys))
474 return PTR_ERR(server->client_sys);
475 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
476 if (IS_ERR(auth))
477 return PTR_ERR(auth);
478 } else {
479 atomic_inc(&server->client->cl_count);
480 server->client_sys = server->client;
481 }
482 if (server->flags & NFS_MOUNT_VER3) {
483 #ifdef CONFIG_NFS_V3_ACL
484 if (!(server->flags & NFS_MOUNT_NOACL)) {
485 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
486 /* No errors! Assume that Sun nfsacls are supported */
487 if (!IS_ERR(server->client_acl))
488 server->caps |= NFS_CAP_ACLS;
489 }
490 #else
491 server->flags &= ~NFS_MOUNT_NOACL;
492 #endif /* CONFIG_NFS_V3_ACL */
493 /*
494 * The VFS shouldn't apply the umask to mode bits. We will
495 * do so ourselves when necessary.
496 */
497 sb->s_flags |= MS_POSIXACL;
498 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
499 server->namelen = NFS3_MAXNAMLEN;
500 sb->s_time_gran = 1;
501 } else {
502 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
503 server->namelen = NFS2_MAXNAMLEN;
504 }
505
506 sb->s_op = &nfs_sops;
507 return nfs_sb_init(sb, authflavor);
508 }
509
510 static int
511 nfs_statfs(struct super_block *sb, struct kstatfs *buf)
512 {
513 struct nfs_server *server = NFS_SB(sb);
514 unsigned char blockbits;
515 unsigned long blockres;
516 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
517 struct nfs_fattr fattr;
518 struct nfs_fsstat res = {
519 .fattr = &fattr,
520 };
521 int error;
522
523 lock_kernel();
524
525 error = server->rpc_ops->statfs(server, rootfh, &res);
526 buf->f_type = NFS_SUPER_MAGIC;
527 if (error < 0)
528 goto out_err;
529
530 /*
531 * Current versions of glibc do not correctly handle the
532 * case where f_frsize != f_bsize. Eventually we want to
533 * report the value of wtmult in this field.
534 */
535 buf->f_frsize = sb->s_blocksize;
536
537 /*
538 * On most *nix systems, f_blocks, f_bfree, and f_bavail
539 * are reported in units of f_frsize. Linux hasn't had
540 * an f_frsize field in its statfs struct until recently,
541 * thus historically Linux's sys_statfs reports these
542 * fields in units of f_bsize.
543 */
544 buf->f_bsize = sb->s_blocksize;
545 blockbits = sb->s_blocksize_bits;
546 blockres = (1 << blockbits) - 1;
547 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
548 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
549 buf->f_bavail = (res.abytes + blockres) >> blockbits;
550
551 buf->f_files = res.tfiles;
552 buf->f_ffree = res.afiles;
553
554 buf->f_namelen = server->namelen;
555 out:
556 unlock_kernel();
557
558 return 0;
559
560 out_err:
561 printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error);
562 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
563 goto out;
564
565 }
566
567 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
568 {
569 static struct proc_nfs_info {
570 int flag;
571 char *str;
572 char *nostr;
573 } nfs_info[] = {
574 { NFS_MOUNT_SOFT, ",soft", ",hard" },
575 { NFS_MOUNT_INTR, ",intr", "" },
576 { NFS_MOUNT_POSIX, ",posix", "" },
577 { NFS_MOUNT_TCP, ",tcp", ",udp" },
578 { NFS_MOUNT_NOCTO, ",nocto", "" },
579 { NFS_MOUNT_NOAC, ",noac", "" },
580 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
581 { NFS_MOUNT_NOACL, ",noacl", "" },
582 { 0, NULL, NULL }
583 };
584 struct proc_nfs_info *nfs_infop;
585 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
586
587 seq_printf(m, ",v%d", nfss->rpc_ops->version);
588 seq_printf(m, ",rsize=%d", nfss->rsize);
589 seq_printf(m, ",wsize=%d", nfss->wsize);
590 if (nfss->acregmin != 3*HZ)
591 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
592 if (nfss->acregmax != 60*HZ)
593 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
594 if (nfss->acdirmin != 30*HZ)
595 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
596 if (nfss->acdirmax != 60*HZ)
597 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
598 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
599 if (nfss->flags & nfs_infop->flag)
600 seq_puts(m, nfs_infop->str);
601 else
602 seq_puts(m, nfs_infop->nostr);
603 }
604 seq_puts(m, ",addr=");
605 seq_escape(m, nfss->hostname, " \t\n\\");
606 return 0;
607 }
608
609 /*
610 * Invalidate the local caches
611 */
612 void
613 nfs_zap_caches(struct inode *inode)
614 {
615 struct nfs_inode *nfsi = NFS_I(inode);
616 int mode = inode->i_mode;
617
618 spin_lock(&inode->i_lock);
619
620 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
621 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
622
623 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
624 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
625 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
626 else
627 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
628
629 spin_unlock(&inode->i_lock);
630 }
631
632 static void nfs_zap_acl_cache(struct inode *inode)
633 {
634 void (*clear_acl_cache)(struct inode *);
635
636 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
637 if (clear_acl_cache != NULL)
638 clear_acl_cache(inode);
639 spin_lock(&inode->i_lock);
640 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
641 spin_unlock(&inode->i_lock);
642 }
643
644 /*
645 * Invalidate, but do not unhash, the inode
646 */
647 static void
648 nfs_invalidate_inode(struct inode *inode)
649 {
650 umode_t save_mode = inode->i_mode;
651
652 make_bad_inode(inode);
653 inode->i_mode = save_mode;
654 nfs_zap_caches(inode);
655 }
656
657 struct nfs_find_desc {
658 struct nfs_fh *fh;
659 struct nfs_fattr *fattr;
660 };
661
662 /*
663 * In NFSv3 we can have 64bit inode numbers. In order to support
664 * this, and re-exported directories (also seen in NFSv2)
665 * we are forced to allow 2 different inodes to have the same
666 * i_ino.
667 */
668 static int
669 nfs_find_actor(struct inode *inode, void *opaque)
670 {
671 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
672 struct nfs_fh *fh = desc->fh;
673 struct nfs_fattr *fattr = desc->fattr;
674
675 if (NFS_FILEID(inode) != fattr->fileid)
676 return 0;
677 if (nfs_compare_fh(NFS_FH(inode), fh))
678 return 0;
679 if (is_bad_inode(inode) || NFS_STALE(inode))
680 return 0;
681 return 1;
682 }
683
684 static int
685 nfs_init_locked(struct inode *inode, void *opaque)
686 {
687 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
688 struct nfs_fattr *fattr = desc->fattr;
689
690 NFS_FILEID(inode) = fattr->fileid;
691 nfs_copy_fh(NFS_FH(inode), desc->fh);
692 return 0;
693 }
694
695 /* Don't use READDIRPLUS on directories that we believe are too large */
696 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
697
698 /*
699 * This is our front-end to iget that looks up inodes by file handle
700 * instead of inode number.
701 */
702 struct inode *
703 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
704 {
705 struct nfs_find_desc desc = {
706 .fh = fh,
707 .fattr = fattr
708 };
709 struct inode *inode = NULL;
710 unsigned long hash;
711
712 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
713 goto out_no_inode;
714
715 if (!fattr->nlink) {
716 printk("NFS: Buggy server - nlink == 0!\n");
717 goto out_no_inode;
718 }
719
720 hash = nfs_fattr_to_ino_t(fattr);
721
722 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
723 goto out_no_inode;
724
725 if (inode->i_state & I_NEW) {
726 struct nfs_inode *nfsi = NFS_I(inode);
727
728 /* We set i_ino for the few things that still rely on it,
729 * such as stat(2) */
730 inode->i_ino = hash;
731
732 /* We can't support update_atime(), since the server will reset it */
733 inode->i_flags |= S_NOATIME|S_NOCMTIME;
734 inode->i_mode = fattr->mode;
735 /* Why so? Because we want revalidate for devices/FIFOs, and
736 * that's precisely what we have in nfs_file_inode_operations.
737 */
738 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
739 if (S_ISREG(inode->i_mode)) {
740 inode->i_fop = &nfs_file_operations;
741 inode->i_data.a_ops = &nfs_file_aops;
742 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
743 } else if (S_ISDIR(inode->i_mode)) {
744 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
745 inode->i_fop = &nfs_dir_operations;
746 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
747 && fattr->size <= NFS_LIMIT_READDIRPLUS)
748 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
749 } else if (S_ISLNK(inode->i_mode))
750 inode->i_op = &nfs_symlink_inode_operations;
751 else
752 init_special_inode(inode, inode->i_mode, fattr->rdev);
753
754 nfsi->read_cache_jiffies = fattr->timestamp;
755 inode->i_atime = fattr->atime;
756 inode->i_mtime = fattr->mtime;
757 inode->i_ctime = fattr->ctime;
758 if (fattr->valid & NFS_ATTR_FATTR_V4)
759 nfsi->change_attr = fattr->change_attr;
760 inode->i_size = nfs_size_to_loff_t(fattr->size);
761 inode->i_nlink = fattr->nlink;
762 inode->i_uid = fattr->uid;
763 inode->i_gid = fattr->gid;
764 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
765 /*
766 * report the blocks in 512byte units
767 */
768 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
769 inode->i_blksize = inode->i_sb->s_blocksize;
770 } else {
771 inode->i_blocks = fattr->du.nfs2.blocks;
772 inode->i_blksize = fattr->du.nfs2.blocksize;
773 }
774 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
775 nfsi->attrtimeo_timestamp = jiffies;
776 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
777 nfsi->cache_access.cred = NULL;
778
779 unlock_new_inode(inode);
780 } else
781 nfs_refresh_inode(inode, fattr);
782 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
783 inode->i_sb->s_id,
784 (long long)NFS_FILEID(inode),
785 atomic_read(&inode->i_count));
786
787 out:
788 return inode;
789
790 out_no_inode:
791 printk("nfs_fhget: iget failed\n");
792 goto out;
793 }
794
795 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
796
797 int
798 nfs_setattr(struct dentry *dentry, struct iattr *attr)
799 {
800 struct inode *inode = dentry->d_inode;
801 struct nfs_fattr fattr;
802 int error;
803
804 if (attr->ia_valid & ATTR_SIZE) {
805 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
806 attr->ia_valid &= ~ATTR_SIZE;
807 }
808
809 /* Optimization: if the end result is no change, don't RPC */
810 attr->ia_valid &= NFS_VALID_ATTRS;
811 if (attr->ia_valid == 0)
812 return 0;
813
814 lock_kernel();
815 nfs_begin_data_update(inode);
816 /* Write all dirty data if we're changing file permissions or size */
817 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
818 if (filemap_fdatawrite(inode->i_mapping) == 0)
819 filemap_fdatawait(inode->i_mapping);
820 nfs_wb_all(inode);
821 }
822 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
823 if (error == 0)
824 nfs_refresh_inode(inode, &fattr);
825 nfs_end_data_update(inode);
826 unlock_kernel();
827 return error;
828 }
829
830 /**
831 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
832 * @inode: pointer to struct inode
833 * @attr: pointer to struct iattr
834 *
835 * Note: we do this in the *proc.c in order to ensure that
836 * it works for things like exclusive creates too.
837 */
838 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
839 {
840 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
841 if ((attr->ia_valid & ATTR_MODE) != 0) {
842 int mode = attr->ia_mode & S_IALLUGO;
843 mode |= inode->i_mode & ~S_IALLUGO;
844 inode->i_mode = mode;
845 }
846 if ((attr->ia_valid & ATTR_UID) != 0)
847 inode->i_uid = attr->ia_uid;
848 if ((attr->ia_valid & ATTR_GID) != 0)
849 inode->i_gid = attr->ia_gid;
850 spin_lock(&inode->i_lock);
851 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
852 spin_unlock(&inode->i_lock);
853 }
854 if ((attr->ia_valid & ATTR_SIZE) != 0) {
855 inode->i_size = attr->ia_size;
856 vmtruncate(inode, attr->ia_size);
857 }
858 }
859
860 static int nfs_wait_schedule(void *word)
861 {
862 if (signal_pending(current))
863 return -ERESTARTSYS;
864 schedule();
865 return 0;
866 }
867
868 /*
869 * Wait for the inode to get unlocked.
870 */
871 static int nfs_wait_on_inode(struct inode *inode)
872 {
873 struct rpc_clnt *clnt = NFS_CLIENT(inode);
874 struct nfs_inode *nfsi = NFS_I(inode);
875 sigset_t oldmask;
876 int error;
877
878 atomic_inc(&inode->i_count);
879 rpc_clnt_sigmask(clnt, &oldmask);
880 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
881 nfs_wait_schedule, TASK_INTERRUPTIBLE);
882 rpc_clnt_sigunmask(clnt, &oldmask);
883 iput(inode);
884
885 return error;
886 }
887
888 static void nfs_wake_up_inode(struct inode *inode)
889 {
890 struct nfs_inode *nfsi = NFS_I(inode);
891
892 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
893 smp_mb__after_clear_bit();
894 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
895 }
896
897 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
898 {
899 struct inode *inode = dentry->d_inode;
900 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
901 int err;
902
903 if (__IS_FLG(inode, MS_NOATIME))
904 need_atime = 0;
905 else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
906 need_atime = 0;
907 /* We may force a getattr if the user cares about atime */
908 if (need_atime)
909 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
910 else
911 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
912 if (!err)
913 generic_fillattr(inode, stat);
914 return err;
915 }
916
917 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
918 {
919 struct nfs_open_context *ctx;
920
921 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
922 if (ctx != NULL) {
923 atomic_set(&ctx->count, 1);
924 ctx->dentry = dget(dentry);
925 ctx->cred = get_rpccred(cred);
926 ctx->state = NULL;
927 ctx->lockowner = current->files;
928 ctx->error = 0;
929 ctx->dir_cookie = 0;
930 }
931 return ctx;
932 }
933
934 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
935 {
936 if (ctx != NULL)
937 atomic_inc(&ctx->count);
938 return ctx;
939 }
940
941 void put_nfs_open_context(struct nfs_open_context *ctx)
942 {
943 if (atomic_dec_and_test(&ctx->count)) {
944 if (!list_empty(&ctx->list)) {
945 struct inode *inode = ctx->dentry->d_inode;
946 spin_lock(&inode->i_lock);
947 list_del(&ctx->list);
948 spin_unlock(&inode->i_lock);
949 }
950 if (ctx->state != NULL)
951 nfs4_close_state(ctx->state, ctx->mode);
952 if (ctx->cred != NULL)
953 put_rpccred(ctx->cred);
954 dput(ctx->dentry);
955 kfree(ctx);
956 }
957 }
958
959 /*
960 * Ensure that mmap has a recent RPC credential for use when writing out
961 * shared pages
962 */
963 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
964 {
965 struct inode *inode = filp->f_dentry->d_inode;
966 struct nfs_inode *nfsi = NFS_I(inode);
967
968 filp->private_data = get_nfs_open_context(ctx);
969 spin_lock(&inode->i_lock);
970 list_add(&ctx->list, &nfsi->open_files);
971 spin_unlock(&inode->i_lock);
972 }
973
974 struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode)
975 {
976 struct nfs_inode *nfsi = NFS_I(inode);
977 struct nfs_open_context *pos, *ctx = NULL;
978
979 spin_lock(&inode->i_lock);
980 list_for_each_entry(pos, &nfsi->open_files, list) {
981 if ((pos->mode & mode) == mode) {
982 ctx = get_nfs_open_context(pos);
983 break;
984 }
985 }
986 spin_unlock(&inode->i_lock);
987 return ctx;
988 }
989
990 void nfs_file_clear_open_context(struct file *filp)
991 {
992 struct inode *inode = filp->f_dentry->d_inode;
993 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
994
995 if (ctx) {
996 filp->private_data = NULL;
997 spin_lock(&inode->i_lock);
998 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
999 spin_unlock(&inode->i_lock);
1000 put_nfs_open_context(ctx);
1001 }
1002 }
1003
1004 /*
1005 * These allocate and release file read/write context information.
1006 */
1007 int nfs_open(struct inode *inode, struct file *filp)
1008 {
1009 struct nfs_open_context *ctx;
1010 struct rpc_cred *cred;
1011
1012 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1013 if (IS_ERR(cred))
1014 return PTR_ERR(cred);
1015 ctx = alloc_nfs_open_context(filp->f_dentry, cred);
1016 put_rpccred(cred);
1017 if (ctx == NULL)
1018 return -ENOMEM;
1019 ctx->mode = filp->f_mode;
1020 nfs_file_set_open_context(filp, ctx);
1021 put_nfs_open_context(ctx);
1022 if ((filp->f_mode & FMODE_WRITE) != 0)
1023 nfs_begin_data_update(inode);
1024 return 0;
1025 }
1026
1027 int nfs_release(struct inode *inode, struct file *filp)
1028 {
1029 if ((filp->f_mode & FMODE_WRITE) != 0)
1030 nfs_end_data_update(inode);
1031 nfs_file_clear_open_context(filp);
1032 return 0;
1033 }
1034
1035 /*
1036 * This function is called whenever some part of NFS notices that
1037 * the cached attributes have to be refreshed.
1038 */
1039 int
1040 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1041 {
1042 int status = -ESTALE;
1043 struct nfs_fattr fattr;
1044 struct nfs_inode *nfsi = NFS_I(inode);
1045 unsigned long verifier;
1046 unsigned long cache_validity;
1047
1048 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1049 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1050
1051 lock_kernel();
1052 if (!inode || is_bad_inode(inode))
1053 goto out_nowait;
1054 if (NFS_STALE(inode))
1055 goto out_nowait;
1056
1057 status = nfs_wait_on_inode(inode);
1058 if (status < 0)
1059 goto out;
1060 if (NFS_STALE(inode)) {
1061 status = -ESTALE;
1062 /* Do we trust the cached ESTALE? */
1063 if (NFS_ATTRTIMEO(inode) != 0) {
1064 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
1065 /* no */
1066 } else
1067 goto out;
1068 }
1069 }
1070
1071 /* Protect against RPC races by saving the change attribute */
1072 verifier = nfs_save_change_attribute(inode);
1073 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1074 if (status != 0) {
1075 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1076 inode->i_sb->s_id,
1077 (long long)NFS_FILEID(inode), status);
1078 if (status == -ESTALE) {
1079 nfs_zap_caches(inode);
1080 if (!S_ISDIR(inode->i_mode))
1081 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1082 }
1083 goto out;
1084 }
1085
1086 status = nfs_update_inode(inode, &fattr, verifier);
1087 if (status) {
1088 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1089 inode->i_sb->s_id,
1090 (long long)NFS_FILEID(inode), status);
1091 goto out;
1092 }
1093 spin_lock(&inode->i_lock);
1094 cache_validity = nfsi->cache_validity;
1095 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1096
1097 /*
1098 * We may need to keep the attributes marked as invalid if
1099 * we raced with nfs_end_attr_update().
1100 */
1101 if (verifier == nfsi->cache_change_attribute)
1102 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1103 spin_unlock(&inode->i_lock);
1104
1105 nfs_revalidate_mapping(inode, inode->i_mapping);
1106
1107 if (cache_validity & NFS_INO_INVALID_ACL)
1108 nfs_zap_acl_cache(inode);
1109
1110 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1111 inode->i_sb->s_id,
1112 (long long)NFS_FILEID(inode));
1113
1114 out:
1115 nfs_wake_up_inode(inode);
1116
1117 out_nowait:
1118 unlock_kernel();
1119 return status;
1120 }
1121
1122 int nfs_attribute_timeout(struct inode *inode)
1123 {
1124 struct nfs_inode *nfsi = NFS_I(inode);
1125
1126 if (nfs_have_delegation(inode, FMODE_READ))
1127 return 0;
1128 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1129 }
1130
1131 /**
1132 * nfs_revalidate_inode - Revalidate the inode attributes
1133 * @server - pointer to nfs_server struct
1134 * @inode - pointer to inode struct
1135 *
1136 * Updates inode attribute information by retrieving the data from the server.
1137 */
1138 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1139 {
1140 if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1141 && !nfs_attribute_timeout(inode))
1142 return NFS_STALE(inode) ? -ESTALE : 0;
1143 return __nfs_revalidate_inode(server, inode);
1144 }
1145
1146 /**
1147 * nfs_revalidate_mapping - Revalidate the pagecache
1148 * @inode - pointer to host inode
1149 * @mapping - pointer to mapping
1150 */
1151 void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1152 {
1153 struct nfs_inode *nfsi = NFS_I(inode);
1154
1155 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
1156 if (S_ISREG(inode->i_mode)) {
1157 if (filemap_fdatawrite(mapping) == 0)
1158 filemap_fdatawait(mapping);
1159 nfs_wb_all(inode);
1160 }
1161 invalidate_inode_pages2(mapping);
1162
1163 spin_lock(&inode->i_lock);
1164 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1165 if (S_ISDIR(inode->i_mode)) {
1166 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1167 /* This ensures we revalidate child dentries */
1168 nfsi->cache_change_attribute++;
1169 }
1170 spin_unlock(&inode->i_lock);
1171
1172 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1173 inode->i_sb->s_id,
1174 (long long)NFS_FILEID(inode));
1175 }
1176 }
1177
1178 /**
1179 * nfs_begin_data_update
1180 * @inode - pointer to inode
1181 * Declare that a set of operations will update file data on the server
1182 */
1183 void nfs_begin_data_update(struct inode *inode)
1184 {
1185 atomic_inc(&NFS_I(inode)->data_updates);
1186 }
1187
1188 /**
1189 * nfs_end_data_update
1190 * @inode - pointer to inode
1191 * Declare end of the operations that will update file data
1192 * This will mark the inode as immediately needing revalidation
1193 * of its attribute cache.
1194 */
1195 void nfs_end_data_update(struct inode *inode)
1196 {
1197 struct nfs_inode *nfsi = NFS_I(inode);
1198
1199 if (!nfs_have_delegation(inode, FMODE_READ)) {
1200 /* Mark the attribute cache for revalidation */
1201 spin_lock(&inode->i_lock);
1202 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1203 /* Directories and symlinks: invalidate page cache too */
1204 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1205 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1206 spin_unlock(&inode->i_lock);
1207 }
1208 nfsi->cache_change_attribute ++;
1209 atomic_dec(&nfsi->data_updates);
1210 }
1211
1212 /**
1213 * nfs_refresh_inode - verify consistency of the inode attribute cache
1214 * @inode - pointer to inode
1215 * @fattr - updated attributes
1216 *
1217 * Verifies the attribute cache. If we have just changed the attributes,
1218 * so that fattr carries weak cache consistency data, then it may
1219 * also update the ctime/mtime/change_attribute.
1220 */
1221 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1222 {
1223 struct nfs_inode *nfsi = NFS_I(inode);
1224 loff_t cur_size, new_isize;
1225 int data_unstable;
1226
1227 /* Do we hold a delegation? */
1228 if (nfs_have_delegation(inode, FMODE_READ))
1229 return 0;
1230
1231 spin_lock(&inode->i_lock);
1232
1233 /* Are we in the process of updating data on the server? */
1234 data_unstable = nfs_caches_unstable(inode);
1235
1236 if (fattr->valid & NFS_ATTR_FATTR_V4) {
1237 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1238 && nfsi->change_attr == fattr->pre_change_attr)
1239 nfsi->change_attr = fattr->change_attr;
1240 if (nfsi->change_attr != fattr->change_attr) {
1241 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1242 if (!data_unstable)
1243 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1244 }
1245 }
1246
1247 if ((fattr->valid & NFS_ATTR_FATTR) == 0) {
1248 spin_unlock(&inode->i_lock);
1249 return 0;
1250 }
1251
1252 /* Has the inode gone and changed behind our back? */
1253 if (nfsi->fileid != fattr->fileid
1254 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1255 spin_unlock(&inode->i_lock);
1256 return -EIO;
1257 }
1258
1259 cur_size = i_size_read(inode);
1260 new_isize = nfs_size_to_loff_t(fattr->size);
1261
1262 /* If we have atomic WCC data, we may update some attributes */
1263 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1264 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
1265 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1266 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
1267 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1268 }
1269
1270 /* Verify a few of the more important attributes */
1271 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1272 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1273 if (!data_unstable)
1274 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1275 }
1276 if (cur_size != new_isize) {
1277 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1278 if (nfsi->npages == 0)
1279 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1280 }
1281
1282 /* Have any file permissions changed? */
1283 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1284 || inode->i_uid != fattr->uid
1285 || inode->i_gid != fattr->gid)
1286 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1287
1288 /* Has the link count changed? */
1289 if (inode->i_nlink != fattr->nlink)
1290 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1291
1292 if (!timespec_equal(&inode->i_atime, &fattr->atime))
1293 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
1294
1295 nfsi->read_cache_jiffies = fattr->timestamp;
1296 spin_unlock(&inode->i_lock);
1297 return 0;
1298 }
1299
1300 /*
1301 * Many nfs protocol calls return the new file attributes after
1302 * an operation. Here we update the inode to reflect the state
1303 * of the server's inode.
1304 *
1305 * This is a bit tricky because we have to make sure all dirty pages
1306 * have been sent off to the server before calling invalidate_inode_pages.
1307 * To make sure no other process adds more write requests while we try
1308 * our best to flush them, we make them sleep during the attribute refresh.
1309 *
1310 * A very similar scenario holds for the dir cache.
1311 */
1312 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
1313 {
1314 struct nfs_inode *nfsi = NFS_I(inode);
1315 loff_t cur_isize, new_isize;
1316 unsigned int invalid = 0;
1317 int data_unstable;
1318
1319 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1320 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1321 atomic_read(&inode->i_count), fattr->valid);
1322
1323 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1324 return 0;
1325
1326 if (nfsi->fileid != fattr->fileid) {
1327 printk(KERN_ERR "%s: inode number mismatch\n"
1328 "expected (%s/0x%Lx), got (%s/0x%Lx)\n",
1329 __FUNCTION__,
1330 inode->i_sb->s_id, (long long)nfsi->fileid,
1331 inode->i_sb->s_id, (long long)fattr->fileid);
1332 goto out_err;
1333 }
1334
1335 spin_lock(&inode->i_lock);
1336
1337 /*
1338 * Make sure the inode's type hasn't changed.
1339 */
1340 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1341 spin_unlock(&inode->i_lock);
1342 goto out_changed;
1343 }
1344
1345 /*
1346 * Update the read time so we don't revalidate too often.
1347 */
1348 nfsi->read_cache_jiffies = fattr->timestamp;
1349
1350 /* Are we racing with known updates of the metadata on the server? */
1351 data_unstable = ! nfs_verify_change_attribute(inode, verifier);
1352
1353 /* Check if our cached file size is stale */
1354 new_isize = nfs_size_to_loff_t(fattr->size);
1355 cur_isize = i_size_read(inode);
1356 if (new_isize != cur_isize) {
1357 /* Do we perhaps have any outstanding writes? */
1358 if (nfsi->npages == 0) {
1359 /* No, but did we race with nfs_end_data_update()? */
1360 if (verifier == nfsi->cache_change_attribute) {
1361 inode->i_size = new_isize;
1362 invalid |= NFS_INO_INVALID_DATA;
1363 }
1364 invalid |= NFS_INO_INVALID_ATTR;
1365 } else if (new_isize > cur_isize) {
1366 inode->i_size = new_isize;
1367 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1368 }
1369 dprintk("NFS: isize change on server for file %s/%ld\n",
1370 inode->i_sb->s_id, inode->i_ino);
1371 }
1372
1373 /* Check if the mtime agrees */
1374 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1375 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1376 dprintk("NFS: mtime change on server for file %s/%ld\n",
1377 inode->i_sb->s_id, inode->i_ino);
1378 if (!data_unstable)
1379 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1380 }
1381
1382 if ((fattr->valid & NFS_ATTR_FATTR_V4)
1383 && nfsi->change_attr != fattr->change_attr) {
1384 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1385 inode->i_sb->s_id, inode->i_ino);
1386 nfsi->change_attr = fattr->change_attr;
1387 if (!data_unstable)
1388 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1389 }
1390
1391 /* If ctime has changed we should definitely clear access+acl caches */
1392 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1393 if (!data_unstable)
1394 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1395 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1396 }
1397 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1398
1399 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1400 inode->i_uid != fattr->uid ||
1401 inode->i_gid != fattr->gid)
1402 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1403
1404 inode->i_mode = fattr->mode;
1405 inode->i_nlink = fattr->nlink;
1406 inode->i_uid = fattr->uid;
1407 inode->i_gid = fattr->gid;
1408
1409 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1410 /*
1411 * report the blocks in 512byte units
1412 */
1413 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1414 inode->i_blksize = inode->i_sb->s_blocksize;
1415 } else {
1416 inode->i_blocks = fattr->du.nfs2.blocks;
1417 inode->i_blksize = fattr->du.nfs2.blocksize;
1418 }
1419
1420 /* Update attrtimeo value if we're out of the unstable period */
1421 if (invalid & NFS_INO_INVALID_ATTR) {
1422 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1423 nfsi->attrtimeo_timestamp = jiffies;
1424 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1425 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1426 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1427 nfsi->attrtimeo_timestamp = jiffies;
1428 }
1429 /* Don't invalidate the data if we were to blame */
1430 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1431 || S_ISLNK(inode->i_mode)))
1432 invalid &= ~NFS_INO_INVALID_DATA;
1433 if (!nfs_have_delegation(inode, FMODE_READ))
1434 nfsi->cache_validity |= invalid;
1435
1436 spin_unlock(&inode->i_lock);
1437 return 0;
1438 out_changed:
1439 /*
1440 * Big trouble! The inode has become a different object.
1441 */
1442 #ifdef NFS_PARANOIA
1443 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1444 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1445 #endif
1446 /*
1447 * No need to worry about unhashing the dentry, as the
1448 * lookup validation will know that the inode is bad.
1449 * (But we fall through to invalidate the caches.)
1450 */
1451 nfs_invalidate_inode(inode);
1452 out_err:
1453 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1454 return -ESTALE;
1455 }
1456
1457 /*
1458 * File system information
1459 */
1460
1461 static int nfs_set_super(struct super_block *s, void *data)
1462 {
1463 s->s_fs_info = data;
1464 return set_anon_super(s, data);
1465 }
1466
1467 static int nfs_compare_super(struct super_block *sb, void *data)
1468 {
1469 struct nfs_server *server = data;
1470 struct nfs_server *old = NFS_SB(sb);
1471
1472 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1473 return 0;
1474 if (old->addr.sin_port != server->addr.sin_port)
1475 return 0;
1476 return !nfs_compare_fh(&old->fh, &server->fh);
1477 }
1478
1479 static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1480 int flags, const char *dev_name, void *raw_data)
1481 {
1482 int error;
1483 struct nfs_server *server = NULL;
1484 struct super_block *s;
1485 struct nfs_fh *root;
1486 struct nfs_mount_data *data = raw_data;
1487
1488 s = ERR_PTR(-EINVAL);
1489 if (data == NULL) {
1490 dprintk("%s: missing data argument\n", __FUNCTION__);
1491 goto out_err;
1492 }
1493 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1494 dprintk("%s: bad mount version\n", __FUNCTION__);
1495 goto out_err;
1496 }
1497 switch (data->version) {
1498 case 1:
1499 data->namlen = 0;
1500 case 2:
1501 data->bsize = 0;
1502 case 3:
1503 if (data->flags & NFS_MOUNT_VER3) {
1504 dprintk("%s: mount structure version %d does not support NFSv3\n",
1505 __FUNCTION__,
1506 data->version);
1507 goto out_err;
1508 }
1509 data->root.size = NFS2_FHSIZE;
1510 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1511 case 4:
1512 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1513 dprintk("%s: mount structure version %d does not support strong security\n",
1514 __FUNCTION__,
1515 data->version);
1516 goto out_err;
1517 }
1518 case 5:
1519 memset(data->context, 0, sizeof(data->context));
1520 }
1521 #ifndef CONFIG_NFS_V3
1522 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1523 s = ERR_PTR(-EPROTONOSUPPORT);
1524 if (data->flags & NFS_MOUNT_VER3) {
1525 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1526 goto out_err;
1527 }
1528 #endif /* CONFIG_NFS_V3 */
1529
1530 s = ERR_PTR(-ENOMEM);
1531 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1532 if (!server)
1533 goto out_err;
1534 memset(server, 0, sizeof(struct nfs_server));
1535 /* Zero out the NFS state stuff */
1536 init_nfsv4_state(server);
1537 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1538
1539 root = &server->fh;
1540 if (data->flags & NFS_MOUNT_VER3)
1541 root->size = data->root.size;
1542 else
1543 root->size = NFS2_FHSIZE;
1544 s = ERR_PTR(-EINVAL);
1545 if (root->size > sizeof(root->data)) {
1546 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1547 goto out_err;
1548 }
1549 memcpy(root->data, data->root.data, root->size);
1550
1551 /* We now require that the mount process passes the remote address */
1552 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1553 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1554 dprintk("%s: mount program didn't pass remote address!\n",
1555 __FUNCTION__);
1556 goto out_err;
1557 }
1558
1559 /* Fire up rpciod if not yet running */
1560 s = ERR_PTR(rpciod_up());
1561 if (IS_ERR(s)) {
1562 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1563 __FUNCTION__, PTR_ERR(s));
1564 goto out_err;
1565 }
1566
1567 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1568 if (IS_ERR(s) || s->s_root)
1569 goto out_rpciod_down;
1570
1571 s->s_flags = flags;
1572
1573 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1574 if (error) {
1575 up_write(&s->s_umount);
1576 deactivate_super(s);
1577 return ERR_PTR(error);
1578 }
1579 s->s_flags |= MS_ACTIVE;
1580 return s;
1581 out_rpciod_down:
1582 rpciod_down();
1583 out_err:
1584 kfree(server);
1585 return s;
1586 }
1587
1588 static void nfs_kill_super(struct super_block *s)
1589 {
1590 struct nfs_server *server = NFS_SB(s);
1591
1592 kill_anon_super(s);
1593
1594 if (!IS_ERR(server->client))
1595 rpc_shutdown_client(server->client);
1596 if (!IS_ERR(server->client_sys))
1597 rpc_shutdown_client(server->client_sys);
1598 if (!IS_ERR(server->client_acl))
1599 rpc_shutdown_client(server->client_acl);
1600
1601 if (!(server->flags & NFS_MOUNT_NONLM))
1602 lockd_down(); /* release rpc.lockd */
1603
1604 rpciod_down(); /* release rpciod */
1605
1606 if (server->hostname != NULL)
1607 kfree(server->hostname);
1608 kfree(server);
1609 }
1610
1611 static struct file_system_type nfs_fs_type = {
1612 .owner = THIS_MODULE,
1613 .name = "nfs",
1614 .get_sb = nfs_get_sb,
1615 .kill_sb = nfs_kill_super,
1616 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1617 };
1618
1619 #ifdef CONFIG_NFS_V4
1620
1621 static void nfs4_clear_inode(struct inode *);
1622
1623
1624 static struct super_operations nfs4_sops = {
1625 .alloc_inode = nfs_alloc_inode,
1626 .destroy_inode = nfs_destroy_inode,
1627 .write_inode = nfs_write_inode,
1628 .delete_inode = nfs_delete_inode,
1629 .statfs = nfs_statfs,
1630 .clear_inode = nfs4_clear_inode,
1631 .umount_begin = nfs_umount_begin,
1632 .show_options = nfs_show_options,
1633 };
1634
1635 /*
1636 * Clean out any remaining NFSv4 state that might be left over due
1637 * to open() calls that passed nfs_atomic_lookup, but failed to call
1638 * nfs_open().
1639 */
1640 static void nfs4_clear_inode(struct inode *inode)
1641 {
1642 struct nfs_inode *nfsi = NFS_I(inode);
1643
1644 /* If we are holding a delegation, return it! */
1645 if (nfsi->delegation != NULL)
1646 nfs_inode_return_delegation(inode);
1647 /* First call standard NFS clear_inode() code */
1648 nfs_clear_inode(inode);
1649 /* Now clear out any remaining state */
1650 while (!list_empty(&nfsi->open_states)) {
1651 struct nfs4_state *state;
1652
1653 state = list_entry(nfsi->open_states.next,
1654 struct nfs4_state,
1655 inode_states);
1656 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1657 __FUNCTION__,
1658 inode->i_sb->s_id,
1659 (long long)NFS_FILEID(inode),
1660 state);
1661 BUG_ON(atomic_read(&state->count) != 1);
1662 nfs4_close_state(state, state->state);
1663 }
1664 }
1665
1666
1667 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1668 {
1669 struct nfs_server *server;
1670 struct nfs4_client *clp = NULL;
1671 struct rpc_xprt *xprt = NULL;
1672 struct rpc_clnt *clnt = NULL;
1673 struct rpc_timeout timeparms;
1674 rpc_authflavor_t authflavour;
1675 int proto, err = -EIO;
1676
1677 sb->s_blocksize_bits = 0;
1678 sb->s_blocksize = 0;
1679 server = NFS_SB(sb);
1680 if (data->rsize != 0)
1681 server->rsize = nfs_block_size(data->rsize, NULL);
1682 if (data->wsize != 0)
1683 server->wsize = nfs_block_size(data->wsize, NULL);
1684 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1685 server->caps = NFS_CAP_ATOMIC_OPEN;
1686
1687 server->acregmin = data->acregmin*HZ;
1688 server->acregmax = data->acregmax*HZ;
1689 server->acdirmin = data->acdirmin*HZ;
1690 server->acdirmax = data->acdirmax*HZ;
1691
1692 server->rpc_ops = &nfs_v4_clientops;
1693 /* Initialize timeout values */
1694
1695 timeparms.to_initval = data->timeo * HZ / 10;
1696 timeparms.to_retries = data->retrans;
1697 timeparms.to_exponential = 1;
1698 if (!timeparms.to_retries)
1699 timeparms.to_retries = 5;
1700
1701 proto = data->proto;
1702 /* Which IP protocol do we use? */
1703 switch (proto) {
1704 case IPPROTO_TCP:
1705 timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT;
1706 if (!timeparms.to_initval)
1707 timeparms.to_initval = 600 * HZ / 10;
1708 break;
1709 case IPPROTO_UDP:
1710 timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT;
1711 if (!timeparms.to_initval)
1712 timeparms.to_initval = 11 * HZ / 10;
1713 break;
1714 default:
1715 return -EINVAL;
1716 }
1717
1718 clp = nfs4_get_client(&server->addr.sin_addr);
1719 if (!clp) {
1720 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1721 return -EIO;
1722 }
1723
1724 /* Now create transport and client */
1725 authflavour = RPC_AUTH_UNIX;
1726 if (data->auth_flavourlen != 0) {
1727 if (data->auth_flavourlen != 1) {
1728 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1729 __FUNCTION__, data->auth_flavourlen);
1730 err = -EINVAL;
1731 goto out_fail;
1732 }
1733 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1734 err = -EFAULT;
1735 goto out_fail;
1736 }
1737 }
1738
1739 down_write(&clp->cl_sem);
1740 if (IS_ERR(clp->cl_rpcclient)) {
1741 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
1742 if (IS_ERR(xprt)) {
1743 up_write(&clp->cl_sem);
1744 err = PTR_ERR(xprt);
1745 dprintk("%s: cannot create RPC transport. Error = %d\n",
1746 __FUNCTION__, err);
1747 goto out_fail;
1748 }
1749 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1750 server->rpc_ops->version, authflavour);
1751 if (IS_ERR(clnt)) {
1752 up_write(&clp->cl_sem);
1753 err = PTR_ERR(clnt);
1754 dprintk("%s: cannot create RPC client. Error = %d\n",
1755 __FUNCTION__, err);
1756 goto out_fail;
1757 }
1758 clnt->cl_intr = 1;
1759 clnt->cl_softrtry = 1;
1760 clnt->cl_chatty = 1;
1761 clp->cl_rpcclient = clnt;
1762 clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
1763 if (IS_ERR(clp->cl_cred)) {
1764 up_write(&clp->cl_sem);
1765 err = PTR_ERR(clp->cl_cred);
1766 clp->cl_cred = NULL;
1767 goto out_fail;
1768 }
1769 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1770 nfs_idmap_new(clp);
1771 }
1772 if (list_empty(&clp->cl_superblocks)) {
1773 err = nfs4_init_client(clp);
1774 if (err != 0) {
1775 up_write(&clp->cl_sem);
1776 goto out_fail;
1777 }
1778 }
1779 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1780 clnt = rpc_clone_client(clp->cl_rpcclient);
1781 if (!IS_ERR(clnt))
1782 server->nfs4_state = clp;
1783 up_write(&clp->cl_sem);
1784 clp = NULL;
1785
1786 if (IS_ERR(clnt)) {
1787 err = PTR_ERR(clnt);
1788 dprintk("%s: cannot create RPC client. Error = %d\n",
1789 __FUNCTION__, err);
1790 return err;
1791 }
1792
1793 server->client = clnt;
1794
1795 if (server->nfs4_state->cl_idmap == NULL) {
1796 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1797 return -ENOMEM;
1798 }
1799
1800 if (clnt->cl_auth->au_flavor != authflavour) {
1801 struct rpc_auth *auth;
1802
1803 auth = rpcauth_create(authflavour, clnt);
1804 if (IS_ERR(auth)) {
1805 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1806 return PTR_ERR(auth);
1807 }
1808 }
1809
1810 sb->s_time_gran = 1;
1811
1812 sb->s_op = &nfs4_sops;
1813 err = nfs_sb_init(sb, authflavour);
1814 if (err == 0)
1815 return 0;
1816 out_fail:
1817 if (clp)
1818 nfs4_put_client(clp);
1819 return err;
1820 }
1821
1822 static int nfs4_compare_super(struct super_block *sb, void *data)
1823 {
1824 struct nfs_server *server = data;
1825 struct nfs_server *old = NFS_SB(sb);
1826
1827 if (strcmp(server->hostname, old->hostname) != 0)
1828 return 0;
1829 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1830 return 0;
1831 return 1;
1832 }
1833
1834 static void *
1835 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1836 {
1837 void *p = NULL;
1838
1839 if (!src->len)
1840 return ERR_PTR(-EINVAL);
1841 if (src->len < maxlen)
1842 maxlen = src->len;
1843 if (dst == NULL) {
1844 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1845 if (p == NULL)
1846 return ERR_PTR(-ENOMEM);
1847 }
1848 if (copy_from_user(dst, src->data, maxlen)) {
1849 if (p != NULL)
1850 kfree(p);
1851 return ERR_PTR(-EFAULT);
1852 }
1853 dst[maxlen] = '\0';
1854 return dst;
1855 }
1856
1857 static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1858 int flags, const char *dev_name, void *raw_data)
1859 {
1860 int error;
1861 struct nfs_server *server;
1862 struct super_block *s;
1863 struct nfs4_mount_data *data = raw_data;
1864 void *p;
1865
1866 if (data == NULL) {
1867 dprintk("%s: missing data argument\n", __FUNCTION__);
1868 return ERR_PTR(-EINVAL);
1869 }
1870 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1871 dprintk("%s: bad mount version\n", __FUNCTION__);
1872 return ERR_PTR(-EINVAL);
1873 }
1874
1875 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1876 if (!server)
1877 return ERR_PTR(-ENOMEM);
1878 memset(server, 0, sizeof(struct nfs_server));
1879 /* Zero out the NFS state stuff */
1880 init_nfsv4_state(server);
1881 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1882
1883 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1884 if (IS_ERR(p))
1885 goto out_err;
1886 server->hostname = p;
1887
1888 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1889 if (IS_ERR(p))
1890 goto out_err;
1891 server->mnt_path = p;
1892
1893 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1894 sizeof(server->ip_addr) - 1);
1895 if (IS_ERR(p))
1896 goto out_err;
1897
1898 /* We now require that the mount process passes the remote address */
1899 if (data->host_addrlen != sizeof(server->addr)) {
1900 s = ERR_PTR(-EINVAL);
1901 goto out_free;
1902 }
1903 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1904 s = ERR_PTR(-EFAULT);
1905 goto out_free;
1906 }
1907 if (server->addr.sin_family != AF_INET ||
1908 server->addr.sin_addr.s_addr == INADDR_ANY) {
1909 dprintk("%s: mount program didn't pass remote IP address!\n",
1910 __FUNCTION__);
1911 s = ERR_PTR(-EINVAL);
1912 goto out_free;
1913 }
1914
1915 /* Fire up rpciod if not yet running */
1916 s = ERR_PTR(rpciod_up());
1917 if (IS_ERR(s)) {
1918 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1919 __FUNCTION__, PTR_ERR(s));
1920 goto out_free;
1921 }
1922
1923 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1924
1925 if (IS_ERR(s) || s->s_root)
1926 goto out_free;
1927
1928 s->s_flags = flags;
1929
1930 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1931 if (error) {
1932 up_write(&s->s_umount);
1933 deactivate_super(s);
1934 return ERR_PTR(error);
1935 }
1936 s->s_flags |= MS_ACTIVE;
1937 return s;
1938 out_err:
1939 s = (struct super_block *)p;
1940 out_free:
1941 if (server->mnt_path)
1942 kfree(server->mnt_path);
1943 if (server->hostname)
1944 kfree(server->hostname);
1945 kfree(server);
1946 return s;
1947 }
1948
1949 static void nfs4_kill_super(struct super_block *sb)
1950 {
1951 struct nfs_server *server = NFS_SB(sb);
1952
1953 nfs_return_all_delegations(sb);
1954 kill_anon_super(sb);
1955
1956 nfs4_renewd_prepare_shutdown(server);
1957
1958 if (server->client != NULL && !IS_ERR(server->client))
1959 rpc_shutdown_client(server->client);
1960 rpciod_down(); /* release rpciod */
1961
1962 destroy_nfsv4_state(server);
1963
1964 if (server->hostname != NULL)
1965 kfree(server->hostname);
1966 kfree(server);
1967 }
1968
1969 static struct file_system_type nfs4_fs_type = {
1970 .owner = THIS_MODULE,
1971 .name = "nfs4",
1972 .get_sb = nfs4_get_sb,
1973 .kill_sb = nfs4_kill_super,
1974 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1975 };
1976
1977 #define nfs4_init_once(nfsi) \
1978 do { \
1979 INIT_LIST_HEAD(&(nfsi)->open_states); \
1980 nfsi->delegation = NULL; \
1981 nfsi->delegation_state = 0; \
1982 init_rwsem(&nfsi->rwsem); \
1983 } while(0)
1984 #define register_nfs4fs() register_filesystem(&nfs4_fs_type)
1985 #define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
1986 #else
1987 #define nfs4_init_once(nfsi) \
1988 do { } while (0)
1989 #define register_nfs4fs() (0)
1990 #define unregister_nfs4fs()
1991 #endif
1992
1993 extern int nfs_init_nfspagecache(void);
1994 extern void nfs_destroy_nfspagecache(void);
1995 extern int nfs_init_readpagecache(void);
1996 extern void nfs_destroy_readpagecache(void);
1997 extern int nfs_init_writepagecache(void);
1998 extern void nfs_destroy_writepagecache(void);
1999 #ifdef CONFIG_NFS_DIRECTIO
2000 extern int nfs_init_directcache(void);
2001 extern void nfs_destroy_directcache(void);
2002 #endif
2003
2004 static kmem_cache_t * nfs_inode_cachep;
2005
2006 static struct inode *nfs_alloc_inode(struct super_block *sb)
2007 {
2008 struct nfs_inode *nfsi;
2009 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
2010 if (!nfsi)
2011 return NULL;
2012 nfsi->flags = 0UL;
2013 nfsi->cache_validity = 0UL;
2014 #ifdef CONFIG_NFS_V3_ACL
2015 nfsi->acl_access = ERR_PTR(-EAGAIN);
2016 nfsi->acl_default = ERR_PTR(-EAGAIN);
2017 #endif
2018 #ifdef CONFIG_NFS_V4
2019 nfsi->nfs4_acl = NULL;
2020 #endif /* CONFIG_NFS_V4 */
2021 return &nfsi->vfs_inode;
2022 }
2023
2024 static void nfs_destroy_inode(struct inode *inode)
2025 {
2026 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2027 }
2028
2029 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
2030 {
2031 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2032
2033 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2034 SLAB_CTOR_CONSTRUCTOR) {
2035 inode_init_once(&nfsi->vfs_inode);
2036 spin_lock_init(&nfsi->req_lock);
2037 INIT_LIST_HEAD(&nfsi->dirty);
2038 INIT_LIST_HEAD(&nfsi->commit);
2039 INIT_LIST_HEAD(&nfsi->open_files);
2040 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
2041 atomic_set(&nfsi->data_updates, 0);
2042 nfsi->ndirty = 0;
2043 nfsi->ncommit = 0;
2044 nfsi->npages = 0;
2045 nfs4_init_once(nfsi);
2046 }
2047 }
2048
2049 static int nfs_init_inodecache(void)
2050 {
2051 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2052 sizeof(struct nfs_inode),
2053 0, SLAB_RECLAIM_ACCOUNT,
2054 init_once, NULL);
2055 if (nfs_inode_cachep == NULL)
2056 return -ENOMEM;
2057
2058 return 0;
2059 }
2060
2061 static void nfs_destroy_inodecache(void)
2062 {
2063 if (kmem_cache_destroy(nfs_inode_cachep))
2064 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
2065 }
2066
2067 /*
2068 * Initialize NFS
2069 */
2070 static int __init init_nfs_fs(void)
2071 {
2072 int err;
2073
2074 err = nfs_init_nfspagecache();
2075 if (err)
2076 goto out4;
2077
2078 err = nfs_init_inodecache();
2079 if (err)
2080 goto out3;
2081
2082 err = nfs_init_readpagecache();
2083 if (err)
2084 goto out2;
2085
2086 err = nfs_init_writepagecache();
2087 if (err)
2088 goto out1;
2089
2090 #ifdef CONFIG_NFS_DIRECTIO
2091 err = nfs_init_directcache();
2092 if (err)
2093 goto out0;
2094 #endif
2095
2096 #ifdef CONFIG_PROC_FS
2097 rpc_proc_register(&nfs_rpcstat);
2098 #endif
2099 err = register_filesystem(&nfs_fs_type);
2100 if (err)
2101 goto out;
2102 if ((err = register_nfs4fs()) != 0)
2103 goto out;
2104 return 0;
2105 out:
2106 #ifdef CONFIG_PROC_FS
2107 rpc_proc_unregister("nfs");
2108 #endif
2109 nfs_destroy_writepagecache();
2110 #ifdef CONFIG_NFS_DIRECTIO
2111 out0:
2112 nfs_destroy_directcache();
2113 #endif
2114 out1:
2115 nfs_destroy_readpagecache();
2116 out2:
2117 nfs_destroy_inodecache();
2118 out3:
2119 nfs_destroy_nfspagecache();
2120 out4:
2121 return err;
2122 }
2123
2124 static void __exit exit_nfs_fs(void)
2125 {
2126 #ifdef CONFIG_NFS_DIRECTIO
2127 nfs_destroy_directcache();
2128 #endif
2129 nfs_destroy_writepagecache();
2130 nfs_destroy_readpagecache();
2131 nfs_destroy_inodecache();
2132 nfs_destroy_nfspagecache();
2133 #ifdef CONFIG_PROC_FS
2134 rpc_proc_unregister("nfs");
2135 #endif
2136 unregister_filesystem(&nfs_fs_type);
2137 unregister_nfs4fs();
2138 }
2139
2140 /* Not quite true; I just maintain it */
2141 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2142 MODULE_LICENSE("GPL");
2143
2144 module_init(init_nfs_fs)
2145 module_exit(exit_nfs_fs)
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