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