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[PATCH] NFS: Allow NFS versions to support different sets of inode operations.
[linux-2.6-block.git] / fs / nfs / inode.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 */
15
16#include <linux/config.h>
17#include <linux/module.h>
18#include <linux/init.h>
19
20#include <linux/time.h>
21#include <linux/kernel.h>
22#include <linux/mm.h>
23#include <linux/string.h>
24#include <linux/stat.h>
25#include <linux/errno.h>
26#include <linux/unistd.h>
27#include <linux/sunrpc/clnt.h>
28#include <linux/sunrpc/stats.h>
29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
33#include <linux/smp_lock.h>
34#include <linux/seq_file.h>
35#include <linux/mount.h>
36#include <linux/nfs_idmap.h>
37#include <linux/vfs.h>
38
39#include <asm/system.h>
40#include <asm/uaccess.h>
41
4ce79717 42#include "nfs4_fs.h"
1da177e4
LT		 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
56static void nfs_invalidate_inode(struct inode *);
57static int nfs_update_inode(struct inode *, struct nfs_fattr *, unsigned long);
58
59static struct inode *nfs_alloc_inode(struct super_block *sb);
60static void nfs_destroy_inode(struct inode *);
61static int nfs_write_inode(struct inode *,int);
62static void nfs_delete_inode(struct inode *);
63static void nfs_clear_inode(struct inode *);
64static void nfs_umount_begin(struct super_block *);
65static int nfs_statfs(struct super_block *, struct kstatfs *);
66static int nfs_show_options(struct seq_file *, struct vfsmount *);
67
68static struct rpc_program nfs_program;
69
70static struct super_operations nfs_sops = {
71 .alloc_inode = nfs_alloc_inode,
72 .destroy_inode = nfs_destroy_inode,
73 .write_inode = nfs_write_inode,
74 .delete_inode = nfs_delete_inode,
75 .statfs = nfs_statfs,
76 .clear_inode = nfs_clear_inode,
77 .umount_begin = nfs_umount_begin,
78 .show_options = nfs_show_options,
79};
80
81/*
82 * RPC cruft for NFS
83 */
84static struct rpc_stat nfs_rpcstat = {
85 .program = &nfs_program
86};
87static struct rpc_version * nfs_version[] = {
88 NULL,
89 NULL,
90 &nfs_version2,
91#if defined(CONFIG_NFS_V3)
92 &nfs_version3,
93#elif defined(CONFIG_NFS_V4)
94 NULL,
95#endif
96#if defined(CONFIG_NFS_V4)
97 &nfs_version4,
98#endif
99};
100
101static struct rpc_program nfs_program = {
102 .name = "nfs",
103 .number = NFS_PROGRAM,
104 .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
105 .version = nfs_version,
106 .stats = &nfs_rpcstat,
107 .pipe_dir_name = "/nfs",
108};
109
110static inline unsigned long
111nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
112{
113 return nfs_fileid_to_ino_t(fattr->fileid);
114}
115
116static int
117nfs_write_inode(struct inode *inode, int sync)
118{
119 int flags = sync ? FLUSH_WAIT : 0;
120 int ret;
121
122 ret = nfs_commit_inode(inode, 0, 0, flags);
123 if (ret < 0)
124 return ret;
125 return 0;
126}
127
128static void
129nfs_delete_inode(struct inode * inode)
130{
131 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
132
133 nfs_wb_all(inode);
134 /*
135 * The following should never happen...
136 */
137 if (nfs_have_writebacks(inode)) {
138 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
139 }
140
141 clear_inode(inode);
142}
143
144/*
145 * For the moment, the only task for the NFS clear_inode method is to
146 * release the mmap credential
147 */
148static void
149nfs_clear_inode(struct inode *inode)
150{
151 struct nfs_inode *nfsi = NFS_I(inode);
152 struct rpc_cred *cred;
153
154 nfs_wb_all(inode);
155 BUG_ON (!list_empty(&nfsi->open_files));
156 cred = nfsi->cache_access.cred;
157 if (cred)
158 put_rpccred(cred);
159 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
160}
161
162void
163nfs_umount_begin(struct super_block *sb)
164{
165 struct nfs_server *server = NFS_SB(sb);
166 struct rpc_clnt *rpc;
167
168 /* -EIO all pending I/O */
169 if ((rpc = server->client) != NULL)
170 rpc_killall_tasks(rpc);
171}
172
173
174static inline unsigned long
175nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
176{
177 /* make sure blocksize is a power of two */
178 if ((bsize & (bsize - 1)) || nrbitsp) {
179 unsigned char nrbits;
180
181 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
182 ;
183 bsize = 1 << nrbits;
184 if (nrbitsp)
185 *nrbitsp = nrbits;
186 }
187
188 return bsize;
189}
190
191/*
192 * Calculate the number of 512byte blocks used.
193 */
194static inline unsigned long
195nfs_calc_block_size(u64 tsize)
196{
197 loff_t used = (tsize + 511) >> 9;
198 return (used > ULONG_MAX) ? ULONG_MAX : used;
199}
200
201/*
202 * Compute and set NFS server blocksize
203 */
204static inline unsigned long
205nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
206{
207 if (bsize < 1024)
208 bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
209 else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
210 bsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
211
212 return nfs_block_bits(bsize, nrbitsp);
213}
214
215/*
216 * Obtain the root inode of the file system.
217 */
218static struct inode *
219nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
220{
221 struct nfs_server *server = NFS_SB(sb);
222 struct inode *rooti;
223 int error;
224
225 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
226 if (error < 0) {
227 dprintk("nfs_get_root: getattr error = %d\n", -error);
228 return ERR_PTR(error);
229 }
230
231 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
232 if (!rooti)
233 return ERR_PTR(-ENOMEM);
234 return rooti;
235}
236
237/*
238 * Do NFS version-independent mount processing, and sanity checking
239 */
240static int
241nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
242{
243 struct nfs_server *server;
244 struct inode *root_inode;
245 struct nfs_fattr fattr;
246 struct nfs_fsinfo fsinfo = {
247 .fattr = &fattr,
248 };
249 struct nfs_pathconf pathinfo = {
250 .fattr = &fattr,
251 };
252 int no_root_error = 0;
253 unsigned long max_rpc_payload;
254
255 /* We probably want something more informative here */
256 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
257
258 server = NFS_SB(sb);
259
260 sb->s_magic = NFS_SUPER_MAGIC;
261
262 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
263 /* Did getting the root inode fail? */
264 if (IS_ERR(root_inode)) {
265 no_root_error = PTR_ERR(root_inode);
266 goto out_no_root;
267 }
268 sb->s_root = d_alloc_root(root_inode);
269 if (!sb->s_root) {
270 no_root_error = -ENOMEM;
271 goto out_no_root;
272 }
273 sb->s_root->d_op = server->rpc_ops->dentry_ops;
274
275 /* Get some general file system info */
276 if (server->namelen == 0 &&
277 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
278 server->namelen = pathinfo.max_namelen;
279 /* Work out a lot of parameters */
280 if (server->rsize == 0)
281 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
282 if (server->wsize == 0)
283 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
284
285 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
286 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
287 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
288 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
289
290 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
291 if (server->rsize > max_rpc_payload)
292 server->rsize = max_rpc_payload;
293 if (server->wsize > max_rpc_payload)
294 server->wsize = max_rpc_payload;
295
296 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
297 if (server->rpages > NFS_READ_MAXIOV) {
298 server->rpages = NFS_READ_MAXIOV;
299 server->rsize = server->rpages << PAGE_CACHE_SHIFT;
300 }
301
302 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
303 if (server->wpages > NFS_WRITE_MAXIOV) {
304 server->wpages = NFS_WRITE_MAXIOV;
305 server->wsize = server->wpages << PAGE_CACHE_SHIFT;
306 }
307
308 if (sb->s_blocksize == 0)
309 sb->s_blocksize = nfs_block_bits(server->wsize,
310 &sb->s_blocksize_bits);
311 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
312
313 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
314 if (server->dtsize > PAGE_CACHE_SIZE)
315 server->dtsize = PAGE_CACHE_SIZE;
316 if (server->dtsize > server->rsize)
317 server->dtsize = server->rsize;
318
319 if (server->flags & NFS_MOUNT_NOAC) {
320 server->acregmin = server->acregmax = 0;
321 server->acdirmin = server->acdirmax = 0;
322 sb->s_flags |= MS_SYNCHRONOUS;
323 }
324 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
325
326 sb->s_maxbytes = fsinfo.maxfilesize;
327 if (sb->s_maxbytes > MAX_LFS_FILESIZE)
328 sb->s_maxbytes = MAX_LFS_FILESIZE;
329
330 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
331 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
332
333 /* We're airborne Set socket buffersize */
334 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
335 return 0;
336 /* Yargs. It didn't work out. */
337out_no_root:
338 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
339 if (!IS_ERR(root_inode))
340 iput(root_inode);
341 return no_root_error;
342}
343
344/*
345 * Create an RPC client handle.
346 */
347static struct rpc_clnt *
348nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
349{
350 struct rpc_timeout timeparms;
351 struct rpc_xprt *xprt = NULL;
352 struct rpc_clnt *clnt = NULL;
353 int tcp = (data->flags & NFS_MOUNT_TCP);
354
355 /* Initialize timeout values */
356 timeparms.to_initval = data->timeo * HZ / 10;
357 timeparms.to_retries = data->retrans;
358 timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT;
359 timeparms.to_exponential = 1;
360
361 if (!timeparms.to_initval)
362 timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10;
363 if (!timeparms.to_retries)
364 timeparms.to_retries = 5;
365
366 /* create transport and client */
367 xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP,
368 &server->addr, &timeparms);
369 if (IS_ERR(xprt)) {
9085bbcb
TM		 370 dprintk("%s: cannot create RPC transport. Error = %ld\n",
371 __FUNCTION__, PTR_ERR(xprt));
1da177e4
LT		 372 return (struct rpc_clnt *)xprt;
373 }
374 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
375 server->rpc_ops->version, data->pseudoflavor);
376 if (IS_ERR(clnt)) {
9085bbcb
TM		 377 dprintk("%s: cannot create RPC client. Error = %ld\n",
378 __FUNCTION__, PTR_ERR(xprt));
1da177e4
LT		 379 goto out_fail;
380 }
381
382 clnt->cl_intr = 1;
383 clnt->cl_softrtry = 1;
384 clnt->cl_chatty = 1;
385
386 return clnt;
387
388out_fail:
1da177e4
LT		 389 return clnt;
390}
391
392/*
393 * The way this works is that the mount process passes a structure
394 * in the data argument which contains the server's IP address
395 * and the root file handle obtained from the server's mount
396 * daemon. We stash these away in the private superblock fields.
397 */
398static int
399nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
400{
401 struct nfs_server *server;
402 rpc_authflavor_t authflavor;
403
404 server = NFS_SB(sb);
405 sb->s_blocksize_bits = 0;
406 sb->s_blocksize = 0;
407 if (data->bsize)
408 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
409 if (data->rsize)
410 server->rsize = nfs_block_size(data->rsize, NULL);
411 if (data->wsize)
412 server->wsize = nfs_block_size(data->wsize, NULL);
413 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
414
415 server->acregmin = data->acregmin*HZ;
416 server->acregmax = data->acregmax*HZ;
417 server->acdirmin = data->acdirmin*HZ;
418 server->acdirmax = data->acdirmax*HZ;
419
420 /* Start lockd here, before we might error out */
421 if (!(server->flags & NFS_MOUNT_NONLM))
422 lockd_up();
423
424 server->namelen = data->namlen;
425 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
426 if (!server->hostname)
427 return -ENOMEM;
428 strcpy(server->hostname, data->hostname);
429
430 /* Check NFS protocol revision and initialize RPC op vector
431 * and file handle pool. */
1da177e4 432#ifdef CONFIG_NFS_V3
9085bbcb 433 if (server->flags & NFS_MOUNT_VER3) {
1da177e4
LT		 434 server->rpc_ops = &nfs_v3_clientops;
435 server->caps |= NFS_CAP_READDIRPLUS;
1da177e4
LT		 436 } else {
437 server->rpc_ops = &nfs_v2_clientops;
438 }
9085bbcb
TM		 439#else
440 server->rpc_ops = &nfs_v2_clientops;
441#endif
1da177e4
LT		 442
443 /* Fill in pseudoflavor for mount version < 5 */
444 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
445 data->pseudoflavor = RPC_AUTH_UNIX;
446 authflavor = data->pseudoflavor; /* save for sb_init() */
447 /* XXX maybe we want to add a server->pseudoflavor field */
448
449 /* Create RPC client handles */
450 server->client = nfs_create_client(server, data);
451 if (IS_ERR(server->client))
452 return PTR_ERR(server->client);
453 /* RFC 2623, sec 2.3.2 */
454 if (authflavor != RPC_AUTH_UNIX) {
455 server->client_sys = rpc_clone_client(server->client);
456 if (IS_ERR(server->client_sys))
457 return PTR_ERR(server->client_sys);
458 if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys))
459 return -ENOMEM;
460 } else {
461 atomic_inc(&server->client->cl_count);
462 server->client_sys = server->client;
463 }
464
465 if (server->flags & NFS_MOUNT_VER3) {
466 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
467 server->namelen = NFS3_MAXNAMLEN;
468 sb->s_time_gran = 1;
469 } else {
470 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
471 server->namelen = NFS2_MAXNAMLEN;
472 }
473
474 sb->s_op = &nfs_sops;
475 return nfs_sb_init(sb, authflavor);
476}
477
478static int
479nfs_statfs(struct super_block *sb, struct kstatfs *buf)
480{
481 struct nfs_server *server = NFS_SB(sb);
482 unsigned char blockbits;
483 unsigned long blockres;
484 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
485 struct nfs_fattr fattr;
486 struct nfs_fsstat res = {
487 .fattr = &fattr,
488 };
489 int error;
490
491 lock_kernel();
492
493 error = server->rpc_ops->statfs(server, rootfh, &res);
494 buf->f_type = NFS_SUPER_MAGIC;
495 if (error < 0)
496 goto out_err;
497
498 /*
499 * Current versions of glibc do not correctly handle the
500 * case where f_frsize != f_bsize. Eventually we want to
501 * report the value of wtmult in this field.
502 */
503 buf->f_frsize = sb->s_blocksize;
504
505 /*
506 * On most *nix systems, f_blocks, f_bfree, and f_bavail
507 * are reported in units of f_frsize. Linux hasn't had
508 * an f_frsize field in its statfs struct until recently,
509 * thus historically Linux's sys_statfs reports these
510 * fields in units of f_bsize.
511 */
512 buf->f_bsize = sb->s_blocksize;
513 blockbits = sb->s_blocksize_bits;
514 blockres = (1 << blockbits) - 1;
515 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
516 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
517 buf->f_bavail = (res.abytes + blockres) >> blockbits;
518
519 buf->f_files = res.tfiles;
520 buf->f_ffree = res.afiles;
521
522 buf->f_namelen = server->namelen;
523 out:
524 unlock_kernel();
525
526 return 0;
527
528 out_err:
529 printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error);
530 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
531 goto out;
532
533}
534
535static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
536{
537 static struct proc_nfs_info {
538 int flag;
539 char *str;
540 char *nostr;
541 } nfs_info[] = {
542 { NFS_MOUNT_SOFT, ",soft", ",hard" },
543 { NFS_MOUNT_INTR, ",intr", "" },
544 { NFS_MOUNT_POSIX, ",posix", "" },
545 { NFS_MOUNT_TCP, ",tcp", ",udp" },
546 { NFS_MOUNT_NOCTO, ",nocto", "" },
547 { NFS_MOUNT_NOAC, ",noac", "" },
548 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
549 { 0, NULL, NULL }
550 };
551 struct proc_nfs_info *nfs_infop;
552 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
553
554 seq_printf(m, ",v%d", nfss->rpc_ops->version);
555 seq_printf(m, ",rsize=%d", nfss->rsize);
556 seq_printf(m, ",wsize=%d", nfss->wsize);
557 if (nfss->acregmin != 3*HZ)
558 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
559 if (nfss->acregmax != 60*HZ)
560 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
561 if (nfss->acdirmin != 30*HZ)
562 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
563 if (nfss->acdirmax != 60*HZ)
564 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
565 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
566 if (nfss->flags & nfs_infop->flag)
567 seq_puts(m, nfs_infop->str);
568 else
569 seq_puts(m, nfs_infop->nostr);
570 }
571 seq_puts(m, ",addr=");
572 seq_escape(m, nfss->hostname, " \t\n\\");
573 return 0;
574}
575
576/*
577 * Invalidate the local caches
578 */
579void
580nfs_zap_caches(struct inode *inode)
581{
582 struct nfs_inode *nfsi = NFS_I(inode);
583 int mode = inode->i_mode;
584
585 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
586 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
587
588 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
589 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
590 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS;
591 else
592 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
593}
594
595/*
596 * Invalidate, but do not unhash, the inode
597 */
598static void
599nfs_invalidate_inode(struct inode *inode)
600{
601 umode_t save_mode = inode->i_mode;
602
603 make_bad_inode(inode);
604 inode->i_mode = save_mode;
605 nfs_zap_caches(inode);
606}
607
608struct nfs_find_desc {
609 struct nfs_fh *fh;
610 struct nfs_fattr *fattr;
611};
612
613/*
614 * In NFSv3 we can have 64bit inode numbers. In order to support
615 * this, and re-exported directories (also seen in NFSv2)
616 * we are forced to allow 2 different inodes to have the same
617 * i_ino.
618 */
619static int
620nfs_find_actor(struct inode *inode, void *opaque)
621{
622 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
623 struct nfs_fh *fh = desc->fh;
624 struct nfs_fattr *fattr = desc->fattr;
625
626 if (NFS_FILEID(inode) != fattr->fileid)
627 return 0;
628 if (nfs_compare_fh(NFS_FH(inode), fh))
629 return 0;
630 if (is_bad_inode(inode) || NFS_STALE(inode))
631 return 0;
632 return 1;
633}
634
635static int
636nfs_init_locked(struct inode *inode, void *opaque)
637{
638 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
639 struct nfs_fattr *fattr = desc->fattr;
640
641 NFS_FILEID(inode) = fattr->fileid;
642 nfs_copy_fh(NFS_FH(inode), desc->fh);
643 return 0;
644}
645
646/* Don't use READDIRPLUS on directories that we believe are too large */
647#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
648
649/*
650 * This is our front-end to iget that looks up inodes by file handle
651 * instead of inode number.
652 */
653struct inode *
654nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
655{
656 struct nfs_find_desc desc = {
657 .fh = fh,
658 .fattr = fattr
659 };
660 struct inode *inode = NULL;
661 unsigned long hash;
662
663 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
664 goto out_no_inode;
665
666 if (!fattr->nlink) {
667 printk("NFS: Buggy server - nlink == 0!\n");
668 goto out_no_inode;
669 }
670
671 hash = nfs_fattr_to_ino_t(fattr);
672
673 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
674 goto out_no_inode;
675
676 if (inode->i_state & I_NEW) {
677 struct nfs_inode *nfsi = NFS_I(inode);
678
679 /* We set i_ino for the few things that still rely on it,
680 * such as stat(2) */
681 inode->i_ino = hash;
682
683 /* We can't support update_atime(), since the server will reset it */
684 inode->i_flags |= S_NOATIME|S_NOCMTIME;
685 inode->i_mode = fattr->mode;
686 /* Why so? Because we want revalidate for devices/FIFOs, and
687 * that's precisely what we have in nfs_file_inode_operations.
688 */
92cfc62c 689 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
1da177e4
LT		 690 if (S_ISREG(inode->i_mode)) {
691 inode->i_fop = &nfs_file_operations;
692 inode->i_data.a_ops = &nfs_file_aops;
693 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
694 } else if (S_ISDIR(inode->i_mode)) {
695 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
696 inode->i_fop = &nfs_dir_operations;
697 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
698 && fattr->size <= NFS_LIMIT_READDIRPLUS)
699 NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS;
700 } else if (S_ISLNK(inode->i_mode))
701 inode->i_op = &nfs_symlink_inode_operations;
702 else
703 init_special_inode(inode, inode->i_mode, fattr->rdev);
704
705 nfsi->read_cache_jiffies = fattr->timestamp;
706 inode->i_atime = fattr->atime;
707 inode->i_mtime = fattr->mtime;
708 inode->i_ctime = fattr->ctime;
709 if (fattr->valid & NFS_ATTR_FATTR_V4)
710 nfsi->change_attr = fattr->change_attr;
711 inode->i_size = nfs_size_to_loff_t(fattr->size);
712 inode->i_nlink = fattr->nlink;
713 inode->i_uid = fattr->uid;
714 inode->i_gid = fattr->gid;
715 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
716 /*
717 * report the blocks in 512byte units
718 */
719 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
720 inode->i_blksize = inode->i_sb->s_blocksize;
721 } else {
722 inode->i_blocks = fattr->du.nfs2.blocks;
723 inode->i_blksize = fattr->du.nfs2.blocksize;
724 }
725 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
726 nfsi->attrtimeo_timestamp = jiffies;
727 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
728 nfsi->cache_access.cred = NULL;
729
730 unlock_new_inode(inode);
731 } else
732 nfs_refresh_inode(inode, fattr);
733 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
734 inode->i_sb->s_id,
735 (long long)NFS_FILEID(inode),
736 atomic_read(&inode->i_count));
737
738out:
739 return inode;
740
741out_no_inode:
742 printk("nfs_fhget: iget failed\n");
743 goto out;
744}
745
746#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
747
748int
749nfs_setattr(struct dentry *dentry, struct iattr *attr)
750{
751 struct inode *inode = dentry->d_inode;
752 struct nfs_fattr fattr;
753 int error;
754
755 if (attr->ia_valid & ATTR_SIZE) {
756 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
757 attr->ia_valid &= ~ATTR_SIZE;
758 }
759
760 /* Optimization: if the end result is no change, don't RPC */
761 attr->ia_valid &= NFS_VALID_ATTRS;
762 if (attr->ia_valid == 0)
763 return 0;
764
765 lock_kernel();
766 nfs_begin_data_update(inode);
767 /* Write all dirty data if we're changing file permissions or size */
768 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
769 if (filemap_fdatawrite(inode->i_mapping) == 0)
770 filemap_fdatawait(inode->i_mapping);
771 nfs_wb_all(inode);
772 }
773 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
774 if (error == 0) {
775 nfs_refresh_inode(inode, &fattr);
776 if ((attr->ia_valid & ATTR_MODE) != 0) {
777 int mode;
778 mode = inode->i_mode & ~S_IALLUGO;
779 mode |= attr->ia_mode & S_IALLUGO;
780 inode->i_mode = mode;
781 }
782 if ((attr->ia_valid & ATTR_UID) != 0)
783 inode->i_uid = attr->ia_uid;
784 if ((attr->ia_valid & ATTR_GID) != 0)
785 inode->i_gid = attr->ia_gid;
786 if ((attr->ia_valid & ATTR_SIZE) != 0) {
787 inode->i_size = attr->ia_size;
788 vmtruncate(inode, attr->ia_size);
789 }
790 }
791 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
792 NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS;
793 nfs_end_data_update(inode);
794 unlock_kernel();
795 return error;
796}
797
798/*
799 * Wait for the inode to get unlocked.
800 * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING).
801 */
802static int
803nfs_wait_on_inode(struct inode *inode, int flag)
804{
805 struct rpc_clnt *clnt = NFS_CLIENT(inode);
806 struct nfs_inode *nfsi = NFS_I(inode);
807
808 int error;
809 if (!(NFS_FLAGS(inode) & flag))
810 return 0;
811 atomic_inc(&inode->i_count);
812 error = nfs_wait_event(clnt, nfsi->nfs_i_wait,
813 !(NFS_FLAGS(inode) & flag));
814 iput(inode);
815 return error;
816}
817
818int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
819{
820 struct inode *inode = dentry->d_inode;
821 struct nfs_inode *nfsi = NFS_I(inode);
822 int need_atime = nfsi->flags & NFS_INO_INVALID_ATIME;
823 int err;
824
825 if (__IS_FLG(inode, MS_NOATIME))
826 need_atime = 0;
827 else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
828 need_atime = 0;
829 /* We may force a getattr if the user cares about atime */
830 if (need_atime)
831 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
832 else
833 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
834 if (!err)
835 generic_fillattr(inode, stat);
836 return err;
837}
838
839struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
840{
841 struct nfs_open_context *ctx;
842
843 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
844 if (ctx != NULL) {
845 atomic_set(&ctx->count, 1);
846 ctx->dentry = dget(dentry);
847 ctx->cred = get_rpccred(cred);
848 ctx->state = NULL;
849 ctx->lockowner = current->files;
850 ctx->error = 0;
1da177e4
LT		 851 }
852 return ctx;
853}
854
855struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
856{
857 if (ctx != NULL)
858 atomic_inc(&ctx->count);
859 return ctx;
860}
861
862void put_nfs_open_context(struct nfs_open_context *ctx)
863{
864 if (atomic_dec_and_test(&ctx->count)) {
865 if (!list_empty(&ctx->list)) {
866 struct inode *inode = ctx->dentry->d_inode;
867 spin_lock(&inode->i_lock);
868 list_del(&ctx->list);
869 spin_unlock(&inode->i_lock);
870 }
871 if (ctx->state != NULL)
872 nfs4_close_state(ctx->state, ctx->mode);
873 if (ctx->cred != NULL)
874 put_rpccred(ctx->cred);
875 dput(ctx->dentry);
876 kfree(ctx);
877 }
878}
879
880/*
881 * Ensure that mmap has a recent RPC credential for use when writing out
882 * shared pages
883 */
884void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
885{
886 struct inode *inode = filp->f_dentry->d_inode;
887 struct nfs_inode *nfsi = NFS_I(inode);
888
889 filp->private_data = get_nfs_open_context(ctx);
890 spin_lock(&inode->i_lock);
891 list_add(&ctx->list, &nfsi->open_files);
892 spin_unlock(&inode->i_lock);
893}
894
895struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode)
896{
897 struct nfs_inode *nfsi = NFS_I(inode);
898 struct nfs_open_context *pos, *ctx = NULL;
899
900 spin_lock(&inode->i_lock);
901 list_for_each_entry(pos, &nfsi->open_files, list) {
902 if ((pos->mode & mode) == mode) {
903 ctx = get_nfs_open_context(pos);
904 break;
905 }
906 }
907 spin_unlock(&inode->i_lock);
908 return ctx;
909}
910
911void nfs_file_clear_open_context(struct file *filp)
912{
913 struct inode *inode = filp->f_dentry->d_inode;
914 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
915
916 if (ctx) {
917 filp->private_data = NULL;
918 spin_lock(&inode->i_lock);
919 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
920 spin_unlock(&inode->i_lock);
921 put_nfs_open_context(ctx);
922 }
923}
924
925/*
926 * These allocate and release file read/write context information.
927 */
928int nfs_open(struct inode *inode, struct file *filp)
929{
930 struct nfs_open_context *ctx;
931 struct rpc_cred *cred;
932
933 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
934 if (IS_ERR(cred))
935 return PTR_ERR(cred);
936 ctx = alloc_nfs_open_context(filp->f_dentry, cred);
937 put_rpccred(cred);
938 if (ctx == NULL)
939 return -ENOMEM;
940 ctx->mode = filp->f_mode;
941 nfs_file_set_open_context(filp, ctx);
942 put_nfs_open_context(ctx);
943 if ((filp->f_mode & FMODE_WRITE) != 0)
944 nfs_begin_data_update(inode);
945 return 0;
946}
947
948int nfs_release(struct inode *inode, struct file *filp)
949{
950 if ((filp->f_mode & FMODE_WRITE) != 0)
951 nfs_end_data_update(inode);
952 nfs_file_clear_open_context(filp);
953 return 0;
954}
955
956/*
957 * This function is called whenever some part of NFS notices that
958 * the cached attributes have to be refreshed.
959 */
960int
961__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
962{
963 int status = -ESTALE;
964 struct nfs_fattr fattr;
965 struct nfs_inode *nfsi = NFS_I(inode);
966 unsigned long verifier;
967 unsigned int flags;
968
969 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
970 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
971
972 lock_kernel();
973 if (!inode || is_bad_inode(inode))
974 goto out_nowait;
975 if (NFS_STALE(inode))
976 goto out_nowait;
977
978 while (NFS_REVALIDATING(inode)) {
979 status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING);
980 if (status < 0)
981 goto out_nowait;
982 if (NFS_ATTRTIMEO(inode) == 0)
983 continue;
984 if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME))
985 continue;
986 status = NFS_STALE(inode) ? -ESTALE : 0;
987 goto out_nowait;
988 }
989 NFS_FLAGS(inode) |= NFS_INO_REVALIDATING;
990
991 /* Protect against RPC races by saving the change attribute */
992 verifier = nfs_save_change_attribute(inode);
993 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
994 if (status != 0) {
995 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
996 inode->i_sb->s_id,
997 (long long)NFS_FILEID(inode), status);
998 if (status == -ESTALE) {
999 nfs_zap_caches(inode);
1000 if (!S_ISDIR(inode->i_mode))
1001 NFS_FLAGS(inode) |= NFS_INO_STALE;
1002 }
1003 goto out;
1004 }
1005
1006 status = nfs_update_inode(inode, &fattr, verifier);
1007 if (status) {
1008 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1009 inode->i_sb->s_id,
1010 (long long)NFS_FILEID(inode), status);
1011 goto out;
1012 }
1013 flags = nfsi->flags;
1014 /*
1015 * We may need to keep the attributes marked as invalid if
1016 * we raced with nfs_end_attr_update().
1017 */
1018 if (verifier == nfsi->cache_change_attribute)
1019 nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1020 /* Do the page cache invalidation */
1021 if (flags & NFS_INO_INVALID_DATA) {
1022 if (S_ISREG(inode->i_mode)) {
1023 if (filemap_fdatawrite(inode->i_mapping) == 0)
1024 filemap_fdatawait(inode->i_mapping);
1025 nfs_wb_all(inode);
1026 }
1027 nfsi->flags &= ~NFS_INO_INVALID_DATA;
1028 invalidate_inode_pages2(inode->i_mapping);
1029 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
1030 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1031 inode->i_sb->s_id,
1032 (long long)NFS_FILEID(inode));
1033 /* This ensures we revalidate dentries */
1034 nfsi->cache_change_attribute++;
1035 }
1036 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1037 inode->i_sb->s_id,
1038 (long long)NFS_FILEID(inode));
1039
1040out:
1041 NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING;
1042 wake_up(&nfsi->nfs_i_wait);
1043 out_nowait:
1044 unlock_kernel();
1045 return status;
1046}
1047
1048int nfs_attribute_timeout(struct inode *inode)
1049{
1050 struct nfs_inode *nfsi = NFS_I(inode);
1051
1052 if (nfs_have_delegation(inode, FMODE_READ))
1053 return 0;
1054 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1055}
1056
1057/**
1058 * nfs_revalidate_inode - Revalidate the inode attributes
1059 * @server - pointer to nfs_server struct
1060 * @inode - pointer to inode struct
1061 *
1062 * Updates inode attribute information by retrieving the data from the server.
1063 */
1064int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1065{
1066 if (!(NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1067 && !nfs_attribute_timeout(inode))
1068 return NFS_STALE(inode) ? -ESTALE : 0;
1069 return __nfs_revalidate_inode(server, inode);
1070}
1071
1072/**
1073 * nfs_begin_data_update
1074 * @inode - pointer to inode
1075 * Declare that a set of operations will update file data on the server
1076 */
1077void nfs_begin_data_update(struct inode *inode)
1078{
1079 atomic_inc(&NFS_I(inode)->data_updates);
1080}
1081
1082/**
1083 * nfs_end_data_update
1084 * @inode - pointer to inode
1085 * Declare end of the operations that will update file data
1086 * This will mark the inode as immediately needing revalidation
1087 * of its attribute cache.
1088 */
1089void nfs_end_data_update(struct inode *inode)
1090{
1091 struct nfs_inode *nfsi = NFS_I(inode);
1092
1093 if (!nfs_have_delegation(inode, FMODE_READ)) {
1094 /* Mark the attribute cache for revalidation */
1095 nfsi->flags |= NFS_INO_INVALID_ATTR;
1096 /* Directories and symlinks: invalidate page cache too */
1097 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1098 nfsi->flags |= NFS_INO_INVALID_DATA;
1099 }
1100 nfsi->cache_change_attribute ++;
1101 atomic_dec(&nfsi->data_updates);
1102}
1103
1104/**
1105 * nfs_end_data_update_defer
1106 * @inode - pointer to inode
1107 * Declare end of the operations that will update file data
1108 * This will defer marking the inode as needing revalidation
1109 * unless there are no other pending updates.
1110 */
1111void nfs_end_data_update_defer(struct inode *inode)
1112{
1113 struct nfs_inode *nfsi = NFS_I(inode);
1114
1115 if (atomic_dec_and_test(&nfsi->data_updates)) {
1116 /* Mark the attribute cache for revalidation */
1117 nfsi->flags |= NFS_INO_INVALID_ATTR;
1118 /* Directories and symlinks: invalidate page cache too */
1119 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1120 nfsi->flags |= NFS_INO_INVALID_DATA;
1121 nfsi->cache_change_attribute ++;
1122 }
1123}
1124
1125/**
1126 * nfs_refresh_inode - verify consistency of the inode attribute cache
1127 * @inode - pointer to inode
1128 * @fattr - updated attributes
1129 *
1130 * Verifies the attribute cache. If we have just changed the attributes,
1131 * so that fattr carries weak cache consistency data, then it may
1132 * also update the ctime/mtime/change_attribute.
1133 */
1134int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1135{
1136 struct nfs_inode *nfsi = NFS_I(inode);
1137 loff_t cur_size, new_isize;
1138 int data_unstable;
1139
1140 /* Do we hold a delegation? */
1141 if (nfs_have_delegation(inode, FMODE_READ))
1142 return 0;
1143
1144 /* Are we in the process of updating data on the server? */
1145 data_unstable = nfs_caches_unstable(inode);
1146
1147 if (fattr->valid & NFS_ATTR_FATTR_V4) {
1148 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1149 && nfsi->change_attr == fattr->pre_change_attr)
1150 nfsi->change_attr = fattr->change_attr;
1151 if (!data_unstable && nfsi->change_attr != fattr->change_attr)
1152 nfsi->flags |= NFS_INO_INVALID_ATTR;
1153 }
1154
1155 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1156 return 0;
1157
1158 /* Has the inode gone and changed behind our back? */
1159 if (nfsi->fileid != fattr->fileid
1160 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1161 return -EIO;
1162
1163 cur_size = i_size_read(inode);
1164 new_isize = nfs_size_to_loff_t(fattr->size);
1165
1166 /* If we have atomic WCC data, we may update some attributes */
1167 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1168 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
1169 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1170 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
1171 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1172 }
1173
1174 /* Verify a few of the more important attributes */
1175 if (!data_unstable) {
1176 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)
1177 || cur_size != new_isize)
1178 nfsi->flags |= NFS_INO_INVALID_ATTR;
1179 } else if (S_ISREG(inode->i_mode) && new_isize > cur_size)
1180 nfsi->flags |= NFS_INO_INVALID_ATTR;
1181
1182 /* Have any file permissions changed? */
1183 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1184 || inode->i_uid != fattr->uid
1185 || inode->i_gid != fattr->gid)
1186 nfsi->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
1187
1188 /* Has the link count changed? */
1189 if (inode->i_nlink != fattr->nlink)
1190 nfsi->flags |= NFS_INO_INVALID_ATTR;
1191
1192 if (!timespec_equal(&inode->i_atime, &fattr->atime))
1193 nfsi->flags |= NFS_INO_INVALID_ATIME;
1194
1195 nfsi->read_cache_jiffies = fattr->timestamp;
1196 return 0;
1197}
1198
1199/*
1200 * Many nfs protocol calls return the new file attributes after
1201 * an operation. Here we update the inode to reflect the state
1202 * of the server's inode.
1203 *
1204 * This is a bit tricky because we have to make sure all dirty pages
1205 * have been sent off to the server before calling invalidate_inode_pages.
1206 * To make sure no other process adds more write requests while we try
1207 * our best to flush them, we make them sleep during the attribute refresh.
1208 *
1209 * A very similar scenario holds for the dir cache.
1210 */
1211static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
1212{
1213 struct nfs_inode *nfsi = NFS_I(inode);
1214 __u64 new_size;
1215 loff_t new_isize;
1216 unsigned int invalid = 0;
1217 loff_t cur_isize;
1218 int data_unstable;
1219
1220 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1221 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1222 atomic_read(&inode->i_count), fattr->valid);
1223
1224 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1225 return 0;
1226
1227 if (nfsi->fileid != fattr->fileid) {
1228 printk(KERN_ERR "%s: inode number mismatch\n"
1229 "expected (%s/0x%Lx), got (%s/0x%Lx)\n",
1230 __FUNCTION__,
1231 inode->i_sb->s_id, (long long)nfsi->fileid,
1232 inode->i_sb->s_id, (long long)fattr->fileid);
1233 goto out_err;
1234 }
1235
1236 /*
1237 * Make sure the inode's type hasn't changed.
1238 */
1239 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1240 goto out_changed;
1241
1242 /*
1243 * Update the read time so we don't revalidate too often.
1244 */
1245 nfsi->read_cache_jiffies = fattr->timestamp;
1246
1247 /* Are we racing with known updates of the metadata on the server? */
1248 data_unstable = ! nfs_verify_change_attribute(inode, verifier);
1249
1250 /* Check if the file size agrees */
1251 new_size = fattr->size;
1252 new_isize = nfs_size_to_loff_t(fattr->size);
1253 cur_isize = i_size_read(inode);
1254 if (cur_isize != new_size) {
1255#ifdef NFS_DEBUG_VERBOSE
1256 printk(KERN_DEBUG "NFS: isize change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
1257#endif
1258 /*
1259 * If we have pending writebacks, things can get
1260 * messy.
1261 */
1262 if (S_ISREG(inode->i_mode) && data_unstable) {
1263 if (new_isize > cur_isize) {
1264 inode->i_size = new_isize;
1265 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1266 }
1267 } else {
1268 inode->i_size = new_isize;
1269 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1270 }
1271 }
1272
1273 /*
1274 * Note: we don't check inode->i_mtime since pipes etc.
1275 * can change this value in VFS without requiring a
1276 * cache revalidation.
1277 */
1278 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1279 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1280#ifdef NFS_DEBUG_VERBOSE
1281 printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
1282#endif
1283 if (!data_unstable)
1284 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1285 }
1286
1287 if ((fattr->valid & NFS_ATTR_FATTR_V4)
1288 && nfsi->change_attr != fattr->change_attr) {
1289#ifdef NFS_DEBUG_VERBOSE
1290 printk(KERN_DEBUG "NFS: change_attr change on %s/%ld\n",
1291 inode->i_sb->s_id, inode->i_ino);
1292#endif
1293 nfsi->change_attr = fattr->change_attr;
1294 if (!data_unstable)
1295 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS;
1296 }
1297
1298 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1299 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1300
1301 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1302 inode->i_uid != fattr->uid ||
1303 inode->i_gid != fattr->gid)
1304 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
1305
1306 inode->i_mode = fattr->mode;
1307 inode->i_nlink = fattr->nlink;
1308 inode->i_uid = fattr->uid;
1309 inode->i_gid = fattr->gid;
1310
1311 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1312 /*
1313 * report the blocks in 512byte units
1314 */
1315 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1316 inode->i_blksize = inode->i_sb->s_blocksize;
1317 } else {
1318 inode->i_blocks = fattr->du.nfs2.blocks;
1319 inode->i_blksize = fattr->du.nfs2.blocksize;
1320 }
1321
1322 /* Update attrtimeo value if we're out of the unstable period */
1323 if (invalid & NFS_INO_INVALID_ATTR) {
1324 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1325 nfsi->attrtimeo_timestamp = jiffies;
1326 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1327 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1328 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1329 nfsi->attrtimeo_timestamp = jiffies;
1330 }
1331 /* Don't invalidate the data if we were to blame */
1332 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1333 || S_ISLNK(inode->i_mode)))
1334 invalid &= ~NFS_INO_INVALID_DATA;
1335 if (!nfs_have_delegation(inode, FMODE_READ))
1336 nfsi->flags |= invalid;
1337
1338 return 0;
1339 out_changed:
1340 /*
1341 * Big trouble! The inode has become a different object.
1342 */
1343#ifdef NFS_PARANOIA
1344 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1345 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1346#endif
1347 /*
1348 * No need to worry about unhashing the dentry, as the
1349 * lookup validation will know that the inode is bad.
1350 * (But we fall through to invalidate the caches.)
1351 */
1352 nfs_invalidate_inode(inode);
1353 out_err:
1354 NFS_FLAGS(inode) |= NFS_INO_STALE;
1355 return -ESTALE;
1356}
1357
1358/*
1359 * File system information
1360 */
1361
1362static int nfs_set_super(struct super_block *s, void *data)
1363{
1364 s->s_fs_info = data;
1365 return set_anon_super(s, data);
1366}
1367
1368static int nfs_compare_super(struct super_block *sb, void *data)
1369{
1370 struct nfs_server *server = data;
1371 struct nfs_server *old = NFS_SB(sb);
1372
1373 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1374 return 0;
1375 if (old->addr.sin_port != server->addr.sin_port)
1376 return 0;
1377 return !nfs_compare_fh(&old->fh, &server->fh);
1378}
1379
1380static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1381 int flags, const char *dev_name, void *raw_data)
1382{
1383 int error;
9085bbcb 1384 struct nfs_server *server = NULL;
1da177e4
LT		 1385 struct super_block *s;
1386 struct nfs_fh *root;
1387 struct nfs_mount_data *data = raw_data;
1388
9085bbcb
TM		 1389 s = ERR_PTR(-EINVAL);
1390 if (data == NULL) {
1391 dprintk("%s: missing data argument\n", __FUNCTION__);
1392 goto out_err;
1393 }
1394 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1395 dprintk("%s: bad mount version\n", __FUNCTION__);
1396 goto out_err;
1da177e4 1397 }
9085bbcb
TM		 1398 switch (data->version) {
1399 case 1:
1400 data->namlen = 0;
1401 case 2:
1402 data->bsize = 0;
1403 case 3:
1404 if (data->flags & NFS_MOUNT_VER3) {
1405 dprintk("%s: mount structure version %d does not support NFSv3\n",
1406 __FUNCTION__,
1407 data->version);
1408 goto out_err;
1409 }
1410 data->root.size = NFS2_FHSIZE;
1411 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1412 case 4:
1413 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1414 dprintk("%s: mount structure version %d does not support strong security\n",
1415 __FUNCTION__,
1416 data->version);
1417 goto out_err;
1418 }
1419 case 5:
1420 memset(data->context, 0, sizeof(data->context));
1421 }
1422#ifndef CONFIG_NFS_V3
1423 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1424 s = ERR_PTR(-EPROTONOSUPPORT);
1425 if (data->flags & NFS_MOUNT_VER3) {
1426 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1427 goto out_err;
1428 }
1429#endif /* CONFIG_NFS_V3 */
1da177e4 1430
9085bbcb 1431 s = ERR_PTR(-ENOMEM);
1da177e4
LT		 1432 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1433 if (!server)
9085bbcb 1434 goto out_err;
1da177e4
LT		 1435 memset(server, 0, sizeof(struct nfs_server));
1436 /* Zero out the NFS state stuff */
1437 init_nfsv4_state(server);
1438
1da177e4
LT		 1439 root = &server->fh;
1440 if (data->flags & NFS_MOUNT_VER3)
1441 root->size = data->root.size;
1442 else
1443 root->size = NFS2_FHSIZE;
9085bbcb 1444 s = ERR_PTR(-EINVAL);
1da177e4 1445 if (root->size > sizeof(root->data)) {
9085bbcb
TM		 1446 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1447 goto out_err;
1da177e4
LT		 1448 }
1449 memcpy(root->data, data->root.data, root->size);
1450
1451 /* We now require that the mount process passes the remote address */
1452 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1453 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
9085bbcb
TM		 1454 dprintk("%s: mount program didn't pass remote address!\n",
1455 __FUNCTION__);
1456 goto out_err;
1da177e4
LT		 1457 }
1458
9085bbcb
TM		 1459 /* Fire up rpciod if not yet running */
1460 s = ERR_PTR(rpciod_up());
1461 if (IS_ERR(s)) {
1462 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1463 __FUNCTION__, PTR_ERR(s));
1464 goto out_err;
1da177e4
LT		 1465 }
1466
9085bbcb
TM		 1467 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1468 if (IS_ERR(s) || s->s_root)
1469 goto out_rpciod_down;
1da177e4 1470
9085bbcb 1471 s->s_flags = flags;
1da177e4
LT		 1472
1473 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1474 if (error) {
1475 up_write(&s->s_umount);
1476 deactivate_super(s);
1477 return ERR_PTR(error);
1478 }
1479 s->s_flags |= MS_ACTIVE;
1480 return s;
9085bbcb
TM		 1481out_rpciod_down:
1482 rpciod_down();
1483out_err:
1484 kfree(server);
1485 return s;
1da177e4
LT		 1486}
1487
1488static void nfs_kill_super(struct super_block *s)
1489{
1490 struct nfs_server *server = NFS_SB(s);
1491
1492 kill_anon_super(s);
1493
1494 if (server->client != NULL && !IS_ERR(server->client))
1495 rpc_shutdown_client(server->client);
1496 if (server->client_sys != NULL && !IS_ERR(server->client_sys))
1497 rpc_shutdown_client(server->client_sys);
1498
1499 if (!(server->flags & NFS_MOUNT_NONLM))
1500 lockd_down(); /* release rpc.lockd */
1501
1502 rpciod_down(); /* release rpciod */
1503
1504 if (server->hostname != NULL)
1505 kfree(server->hostname);
1506 kfree(server);
1507}
1508
1509static struct file_system_type nfs_fs_type = {
1510 .owner = THIS_MODULE,
1511 .name = "nfs",
1512 .get_sb = nfs_get_sb,
1513 .kill_sb = nfs_kill_super,
1514 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1515};
1516
1517#ifdef CONFIG_NFS_V4
1518
1519static void nfs4_clear_inode(struct inode *);
1520
1521
1522static struct super_operations nfs4_sops = {
1523 .alloc_inode = nfs_alloc_inode,
1524 .destroy_inode = nfs_destroy_inode,
1525 .write_inode = nfs_write_inode,
1526 .delete_inode = nfs_delete_inode,
1527 .statfs = nfs_statfs,
1528 .clear_inode = nfs4_clear_inode,
1529 .umount_begin = nfs_umount_begin,
1530 .show_options = nfs_show_options,
1531};
1532
1533/*
1534 * Clean out any remaining NFSv4 state that might be left over due
1535 * to open() calls that passed nfs_atomic_lookup, but failed to call
1536 * nfs_open().
1537 */
1538static void nfs4_clear_inode(struct inode *inode)
1539{
1540 struct nfs_inode *nfsi = NFS_I(inode);
1541
1542 /* If we are holding a delegation, return it! */
1543 if (nfsi->delegation != NULL)
1544 nfs_inode_return_delegation(inode);
1545 /* First call standard NFS clear_inode() code */
1546 nfs_clear_inode(inode);
1547 /* Now clear out any remaining state */
1548 while (!list_empty(&nfsi->open_states)) {
1549 struct nfs4_state *state;
1550
1551 state = list_entry(nfsi->open_states.next,
1552 struct nfs4_state,
1553 inode_states);
1554 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1555 __FUNCTION__,
1556 inode->i_sb->s_id,
1557 (long long)NFS_FILEID(inode),
1558 state);
1559 BUG_ON(atomic_read(&state->count) != 1);
1560 nfs4_close_state(state, state->state);
1561 }
1562}
1563
1564
1565static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1566{
1567 struct nfs_server *server;
1568 struct nfs4_client *clp = NULL;
1569 struct rpc_xprt *xprt = NULL;
1570 struct rpc_clnt *clnt = NULL;
1571 struct rpc_timeout timeparms;
1572 rpc_authflavor_t authflavour;
1573 int proto, err = -EIO;
1574
1575 sb->s_blocksize_bits = 0;
1576 sb->s_blocksize = 0;
1577 server = NFS_SB(sb);
1578 if (data->rsize != 0)
1579 server->rsize = nfs_block_size(data->rsize, NULL);
1580 if (data->wsize != 0)
1581 server->wsize = nfs_block_size(data->wsize, NULL);
1582 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1583 server->caps = NFS_CAP_ATOMIC_OPEN;
1584
1585 server->acregmin = data->acregmin*HZ;
1586 server->acregmax = data->acregmax*HZ;
1587 server->acdirmin = data->acdirmin*HZ;
1588 server->acdirmax = data->acdirmax*HZ;
1589
1590 server->rpc_ops = &nfs_v4_clientops;
1591 /* Initialize timeout values */
1592
1593 timeparms.to_initval = data->timeo * HZ / 10;
1594 timeparms.to_retries = data->retrans;
1595 timeparms.to_exponential = 1;
1596 if (!timeparms.to_retries)
1597 timeparms.to_retries = 5;
1598
1599 proto = data->proto;
1600 /* Which IP protocol do we use? */
1601 switch (proto) {
1602 case IPPROTO_TCP:
1603 timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT;
1604 if (!timeparms.to_initval)
1605 timeparms.to_initval = 600 * HZ / 10;
1606 break;
1607 case IPPROTO_UDP:
1608 timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT;
1609 if (!timeparms.to_initval)
1610 timeparms.to_initval = 11 * HZ / 10;
1611 break;
1612 default:
1613 return -EINVAL;
1614 }
1615
1616 clp = nfs4_get_client(&server->addr.sin_addr);
1617 if (!clp) {
9085bbcb 1618 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1da177e4
LT		 1619 return -EIO;
1620 }
1621
1622 /* Now create transport and client */
1623 authflavour = RPC_AUTH_UNIX;
1624 if (data->auth_flavourlen != 0) {
9085bbcb
TM		 1625 if (data->auth_flavourlen != 1) {
1626 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1627 __FUNCTION__, data->auth_flavourlen);
1628 err = -EINVAL;
1629 goto out_fail;
1630 }
1da177e4
LT		 1631 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1632 err = -EFAULT;
1633 goto out_fail;
1634 }
1635 }
1636
1637 down_write(&clp->cl_sem);
1638 if (clp->cl_rpcclient == NULL) {
1639 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
1640 if (IS_ERR(xprt)) {
1641 up_write(&clp->cl_sem);
1da177e4 1642 err = PTR_ERR(xprt);
9085bbcb
TM		 1643 dprintk("%s: cannot create RPC transport. Error = %d\n",
1644 __FUNCTION__, err);
1da177e4
LT		 1645 goto out_fail;
1646 }
1647 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1648 server->rpc_ops->version, authflavour);
1649 if (IS_ERR(clnt)) {
1650 up_write(&clp->cl_sem);
1da177e4 1651 err = PTR_ERR(clnt);
9085bbcb
TM		 1652 dprintk("%s: cannot create RPC client. Error = %d\n",
1653 __FUNCTION__, err);
1da177e4
LT		 1654 goto out_fail;
1655 }
1656 clnt->cl_intr = 1;
1657 clnt->cl_softrtry = 1;
1658 clnt->cl_chatty = 1;
1659 clp->cl_rpcclient = clnt;
1660 clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
1661 if (IS_ERR(clp->cl_cred)) {
1662 up_write(&clp->cl_sem);
1663 err = PTR_ERR(clp->cl_cred);
1664 clp->cl_cred = NULL;
1665 goto out_fail;
1666 }
1667 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1668 nfs_idmap_new(clp);
1669 }
1670 if (list_empty(&clp->cl_superblocks)) {
1671 err = nfs4_init_client(clp);
1672 if (err != 0) {
1673 up_write(&clp->cl_sem);
1674 goto out_fail;
1675 }
1676 }
1677 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1678 clnt = rpc_clone_client(clp->cl_rpcclient);
1679 if (!IS_ERR(clnt))
1680 server->nfs4_state = clp;
1681 up_write(&clp->cl_sem);
1682 clp = NULL;
1683
1684 if (IS_ERR(clnt)) {
9085bbcb
TM		 1685 err = PTR_ERR(clnt);
1686 dprintk("%s: cannot create RPC client. Error = %d\n",
1687 __FUNCTION__, err);
1688 return err;
1da177e4
LT		 1689 }
1690
1691 server->client = clnt;
1692
1693 if (server->nfs4_state->cl_idmap == NULL) {
9085bbcb 1694 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1da177e4
LT		 1695 return -ENOMEM;
1696 }
1697
1698 if (clnt->cl_auth->au_flavor != authflavour) {
1699 if (rpcauth_create(authflavour, clnt) == NULL) {
9085bbcb 1700 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1da177e4
LT		 1701 return -ENOMEM;
1702 }
1703 }
1704
1705 sb->s_time_gran = 1;
1706
1707 sb->s_op = &nfs4_sops;
1708 err = nfs_sb_init(sb, authflavour);
1709 if (err == 0)
1710 return 0;
1711out_fail:
1712 if (clp)
1713 nfs4_put_client(clp);
1714 return err;
1715}
1716
1717static int nfs4_compare_super(struct super_block *sb, void *data)
1718{
1719 struct nfs_server *server = data;
1720 struct nfs_server *old = NFS_SB(sb);
1721
1722 if (strcmp(server->hostname, old->hostname) != 0)
1723 return 0;
1724 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1725 return 0;
1726 return 1;
1727}
1728
1729static void *
1730nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1731{
1732 void *p = NULL;
1733
1734 if (!src->len)
1735 return ERR_PTR(-EINVAL);
1736 if (src->len < maxlen)
1737 maxlen = src->len;
1738 if (dst == NULL) {
1739 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1740 if (p == NULL)
1741 return ERR_PTR(-ENOMEM);
1742 }
1743 if (copy_from_user(dst, src->data, maxlen)) {
1744 if (p != NULL)
1745 kfree(p);
1746 return ERR_PTR(-EFAULT);
1747 }
1748 dst[maxlen] = '\0';
1749 return dst;
1750}
1751
1752static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1753 int flags, const char *dev_name, void *raw_data)
1754{
1755 int error;
1756 struct nfs_server *server;
1757 struct super_block *s;
1758 struct nfs4_mount_data *data = raw_data;
1759 void *p;
1760
9085bbcb
TM		 1761 if (data == NULL) {
1762 dprintk("%s: missing data argument\n", __FUNCTION__);
1763 return ERR_PTR(-EINVAL);
1764 }
1765 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1766 dprintk("%s: bad mount version\n", __FUNCTION__);
1da177e4
LT		 1767 return ERR_PTR(-EINVAL);
1768 }
1769
1770 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1771 if (!server)
1772 return ERR_PTR(-ENOMEM);
1773 memset(server, 0, sizeof(struct nfs_server));
1774 /* Zero out the NFS state stuff */
1775 init_nfsv4_state(server);
1776
1da177e4
LT		 1777 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1778 if (IS_ERR(p))
1779 goto out_err;
1780 server->hostname = p;
1781
1782 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1783 if (IS_ERR(p))
1784 goto out_err;
1785 server->mnt_path = p;
1786
1787 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1788 sizeof(server->ip_addr) - 1);
1789 if (IS_ERR(p))
1790 goto out_err;
1791
1792 /* We now require that the mount process passes the remote address */
1793 if (data->host_addrlen != sizeof(server->addr)) {
1794 s = ERR_PTR(-EINVAL);
1795 goto out_free;
1796 }
1797 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1798 s = ERR_PTR(-EFAULT);
1799 goto out_free;
1800 }
1801 if (server->addr.sin_family != AF_INET ||
1802 server->addr.sin_addr.s_addr == INADDR_ANY) {
9085bbcb
TM		 1803 dprintk("%s: mount program didn't pass remote IP address!\n",
1804 __FUNCTION__);
1da177e4
LT		 1805 s = ERR_PTR(-EINVAL);
1806 goto out_free;
1807 }
1808
9085bbcb
TM		 1809 /* Fire up rpciod if not yet running */
1810 s = ERR_PTR(rpciod_up());
1811 if (IS_ERR(s)) {
1812 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1813 __FUNCTION__, PTR_ERR(s));
1814 goto out_free;
1815 }
1816
1da177e4
LT		 1817 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1818
1819 if (IS_ERR(s) || s->s_root)
1820 goto out_free;
1821
1822 s->s_flags = flags;
1823
1da177e4
LT		 1824 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1825 if (error) {
1826 up_write(&s->s_umount);
1827 deactivate_super(s);
1828 return ERR_PTR(error);
1829 }
1830 s->s_flags |= MS_ACTIVE;
1831 return s;
1832out_err:
1833 s = (struct super_block *)p;
1834out_free:
1835 if (server->mnt_path)
1836 kfree(server->mnt_path);
1837 if (server->hostname)
1838 kfree(server->hostname);
1839 kfree(server);
1840 return s;
1841}
1842
1843static void nfs4_kill_super(struct super_block *sb)
1844{
1845 struct nfs_server *server = NFS_SB(sb);
1846
1847 nfs_return_all_delegations(sb);
1848 kill_anon_super(sb);
1849
1850 nfs4_renewd_prepare_shutdown(server);
1851
1852 if (server->client != NULL && !IS_ERR(server->client))
1853 rpc_shutdown_client(server->client);
1854 rpciod_down(); /* release rpciod */
1855
1856 destroy_nfsv4_state(server);
1857
1858 if (server->hostname != NULL)
1859 kfree(server->hostname);
1860 kfree(server);
1861}
1862
1863static struct file_system_type nfs4_fs_type = {
1864 .owner = THIS_MODULE,
1865 .name = "nfs4",
1866 .get_sb = nfs4_get_sb,
1867 .kill_sb = nfs4_kill_super,
1868 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1869};
1870
1871#define nfs4_init_once(nfsi) \
1872 do { \
1873 INIT_LIST_HEAD(&(nfsi)->open_states); \
1874 nfsi->delegation = NULL; \
1875 nfsi->delegation_state = 0; \
1876 init_rwsem(&nfsi->rwsem); \
1877 } while(0)
1878#define register_nfs4fs() register_filesystem(&nfs4_fs_type)
1879#define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
1880#else
1881#define nfs4_init_once(nfsi) \
1882 do { } while (0)
1883#define register_nfs4fs() (0)
1884#define unregister_nfs4fs()
1885#endif
1886
1887extern int nfs_init_nfspagecache(void);
1888extern void nfs_destroy_nfspagecache(void);
1889extern int nfs_init_readpagecache(void);
1890extern void nfs_destroy_readpagecache(void);
1891extern int nfs_init_writepagecache(void);
1892extern void nfs_destroy_writepagecache(void);
1893#ifdef CONFIG_NFS_DIRECTIO
1894extern int nfs_init_directcache(void);
1895extern void nfs_destroy_directcache(void);
1896#endif
1897
1898static kmem_cache_t * nfs_inode_cachep;
1899
1900static struct inode *nfs_alloc_inode(struct super_block *sb)
1901{
1902 struct nfs_inode *nfsi;
1903 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
1904 if (!nfsi)
1905 return NULL;
1906 nfsi->flags = 0;
1907 return &nfsi->vfs_inode;
1908}
1909
1910static void nfs_destroy_inode(struct inode *inode)
1911{
1912 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1913}
1914
1915static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
1916{
1917 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1918
1919 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
1920 SLAB_CTOR_CONSTRUCTOR) {
1921 inode_init_once(&nfsi->vfs_inode);
1922 spin_lock_init(&nfsi->req_lock);
1923 INIT_LIST_HEAD(&nfsi->dirty);
1924 INIT_LIST_HEAD(&nfsi->commit);
1925 INIT_LIST_HEAD(&nfsi->open_files);
1926 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1927 atomic_set(&nfsi->data_updates, 0);
1928 nfsi->ndirty = 0;
1929 nfsi->ncommit = 0;
1930 nfsi->npages = 0;
1931 init_waitqueue_head(&nfsi->nfs_i_wait);
1932 nfs4_init_once(nfsi);
1933 }
1934}
1935
75c96f85 1936static int nfs_init_inodecache(void)
1da177e4
LT		 1937{
1938 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1939 sizeof(struct nfs_inode),
1940 0, SLAB_RECLAIM_ACCOUNT,
1941 init_once, NULL);
1942 if (nfs_inode_cachep == NULL)
1943 return -ENOMEM;
1944
1945 return 0;
1946}
1947
75c96f85 1948static void nfs_destroy_inodecache(void)
1da177e4
LT		 1949{
1950 if (kmem_cache_destroy(nfs_inode_cachep))
1951 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
1952}
1953
1954/*
1955 * Initialize NFS
1956 */
1957static int __init init_nfs_fs(void)
1958{
1959 int err;
1960
1961 err = nfs_init_nfspagecache();
1962 if (err)
1963 goto out4;
1964
1965 err = nfs_init_inodecache();
1966 if (err)
1967 goto out3;
1968
1969 err = nfs_init_readpagecache();
1970 if (err)
1971 goto out2;
1972
1973 err = nfs_init_writepagecache();
1974 if (err)
1975 goto out1;
1976
1977#ifdef CONFIG_NFS_DIRECTIO
1978 err = nfs_init_directcache();
1979 if (err)
1980 goto out0;
1981#endif
1982
1983#ifdef CONFIG_PROC_FS
1984 rpc_proc_register(&nfs_rpcstat);
1985#endif
1986 err = register_filesystem(&nfs_fs_type);
1987 if (err)
1988 goto out;
1989 if ((err = register_nfs4fs()) != 0)
1990 goto out;
1991 return 0;
1992out:
1993#ifdef CONFIG_PROC_FS
1994 rpc_proc_unregister("nfs");
1995#endif
1996 nfs_destroy_writepagecache();
1997#ifdef CONFIG_NFS_DIRECTIO
1998out0:
1999 nfs_destroy_directcache();
2000#endif
2001out1:
2002 nfs_destroy_readpagecache();
2003out2:
2004 nfs_destroy_inodecache();
2005out3:
2006 nfs_destroy_nfspagecache();
2007out4:
2008 return err;
2009}
2010
2011static void __exit exit_nfs_fs(void)
2012{
2013#ifdef CONFIG_NFS_DIRECTIO
2014 nfs_destroy_directcache();
2015#endif
2016 nfs_destroy_writepagecache();
2017 nfs_destroy_readpagecache();
2018 nfs_destroy_inodecache();
2019 nfs_destroy_nfspagecache();
2020#ifdef CONFIG_PROC_FS
2021 rpc_proc_unregister("nfs");
2022#endif
2023 unregister_filesystem(&nfs_fs_type);
2024 unregister_nfs4fs();
2025}
2026
2027/* Not quite true; I just maintain it */
2028MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2029MODULE_LICENSE("GPL");
2030
2031module_init(init_nfs_fs)
2032module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)