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[PATCH] NFS: Fix the file size revalidation
[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 *);
ada70d94 67static void nfs_zap_acl_cache(struct inode *);
1da177e4
LT		 68
69static struct rpc_program nfs_program;
70
71static 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 */
85static struct rpc_stat nfs_rpcstat = {
86 .program = &nfs_program
87};
88static 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
102static 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
b7fa0554
AG		 111#ifdef CONFIG_NFS_V3_ACL
112static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
113static struct rpc_version * nfsacl_version[] = {
114 [3] = &nfsacl_version3,
115};
116
117struct 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
1da177e4
LT		 126static inline unsigned long
127nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
128{
129 return nfs_fileid_to_ino_t(fattr->fileid);
130}
131
132static int
133nfs_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, 0, 0, flags);
139 if (ret < 0)
140 return ret;
141 return 0;
142}
143
144static void
145nfs_delete_inode(struct inode * inode)
146{
147 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
148
149 nfs_wb_all(inode);
150 /*
151 * The following should never happen...
152 */
153 if (nfs_have_writebacks(inode)) {
154 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
155 }
156
157 clear_inode(inode);
158}
159
1da177e4
LT		 160static void
161nfs_clear_inode(struct inode *inode)
162{
163 struct nfs_inode *nfsi = NFS_I(inode);
164 struct rpc_cred *cred;
165
166 nfs_wb_all(inode);
167 BUG_ON (!list_empty(&nfsi->open_files));
ada70d94 168 nfs_zap_acl_cache(inode);
1da177e4
LT		 169 cred = nfsi->cache_access.cred;
170 if (cred)
171 put_rpccred(cred);
172 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
173}
174
175void
176nfs_umount_begin(struct super_block *sb)
177{
6a19275a 178 struct rpc_clnt *rpc = NFS_SB(sb)->client;
1da177e4
LT		 179
180 /* -EIO all pending I/O */
6a19275a 181 if (!IS_ERR(rpc))
1da177e4 182 rpc_killall_tasks(rpc);
b7fa0554
AG		 183 rpc = NFS_SB(sb)->client_acl;
184 if (!IS_ERR(rpc))
185 rpc_killall_tasks(rpc);
1da177e4
LT		 186}
187
188
189static inline unsigned long
190nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
191{
192 /* make sure blocksize is a power of two */
193 if ((bsize & (bsize - 1)) || nrbitsp) {
194 unsigned char nrbits;
195
196 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
197 ;
198 bsize = 1 << nrbits;
199 if (nrbitsp)
200 *nrbitsp = nrbits;
201 }
202
203 return bsize;
204}
205
206/*
207 * Calculate the number of 512byte blocks used.
208 */
209static inline unsigned long
210nfs_calc_block_size(u64 tsize)
211{
212 loff_t used = (tsize + 511) >> 9;
213 return (used > ULONG_MAX) ? ULONG_MAX : used;
214}
215
216/*
217 * Compute and set NFS server blocksize
218 */
219static inline unsigned long
220nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
221{
222 if (bsize < 1024)
223 bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
224 else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
225 bsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
226
227 return nfs_block_bits(bsize, nrbitsp);
228}
229
230/*
231 * Obtain the root inode of the file system.
232 */
233static struct inode *
234nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
235{
236 struct nfs_server *server = NFS_SB(sb);
237 struct inode *rooti;
238 int error;
239
240 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
241 if (error < 0) {
242 dprintk("nfs_get_root: getattr error = %d\n", -error);
243 return ERR_PTR(error);
244 }
245
246 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
247 if (!rooti)
248 return ERR_PTR(-ENOMEM);
249 return rooti;
250}
251
252/*
253 * Do NFS version-independent mount processing, and sanity checking
254 */
255static int
256nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
257{
258 struct nfs_server *server;
259 struct inode *root_inode;
260 struct nfs_fattr fattr;
261 struct nfs_fsinfo fsinfo = {
262 .fattr = &fattr,
263 };
264 struct nfs_pathconf pathinfo = {
265 .fattr = &fattr,
266 };
267 int no_root_error = 0;
268 unsigned long max_rpc_payload;
269
270 /* We probably want something more informative here */
271 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
272
273 server = NFS_SB(sb);
274
275 sb->s_magic = NFS_SUPER_MAGIC;
276
277 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
278 /* Did getting the root inode fail? */
279 if (IS_ERR(root_inode)) {
280 no_root_error = PTR_ERR(root_inode);
281 goto out_no_root;
282 }
283 sb->s_root = d_alloc_root(root_inode);
284 if (!sb->s_root) {
285 no_root_error = -ENOMEM;
286 goto out_no_root;
287 }
288 sb->s_root->d_op = server->rpc_ops->dentry_ops;
289
290 /* Get some general file system info */
291 if (server->namelen == 0 &&
292 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
293 server->namelen = pathinfo.max_namelen;
294 /* Work out a lot of parameters */
295 if (server->rsize == 0)
296 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
297 if (server->wsize == 0)
298 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
299
300 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
301 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
302 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
303 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
304
305 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
306 if (server->rsize > max_rpc_payload)
307 server->rsize = max_rpc_payload;
308 if (server->wsize > max_rpc_payload)
309 server->wsize = max_rpc_payload;
310
311 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
312 if (server->rpages > NFS_READ_MAXIOV) {
313 server->rpages = NFS_READ_MAXIOV;
314 server->rsize = server->rpages << PAGE_CACHE_SHIFT;
315 }
316
317 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
318 if (server->wpages > NFS_WRITE_MAXIOV) {
319 server->wpages = NFS_WRITE_MAXIOV;
320 server->wsize = server->wpages << PAGE_CACHE_SHIFT;
321 }
322
323 if (sb->s_blocksize == 0)
324 sb->s_blocksize = nfs_block_bits(server->wsize,
325 &sb->s_blocksize_bits);
326 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
327
328 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
329 if (server->dtsize > PAGE_CACHE_SIZE)
330 server->dtsize = PAGE_CACHE_SIZE;
331 if (server->dtsize > server->rsize)
332 server->dtsize = server->rsize;
333
334 if (server->flags & NFS_MOUNT_NOAC) {
335 server->acregmin = server->acregmax = 0;
336 server->acdirmin = server->acdirmax = 0;
337 sb->s_flags |= MS_SYNCHRONOUS;
338 }
339 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
340
341 sb->s_maxbytes = fsinfo.maxfilesize;
342 if (sb->s_maxbytes > MAX_LFS_FILESIZE)
343 sb->s_maxbytes = MAX_LFS_FILESIZE;
344
345 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
346 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
347
348 /* We're airborne Set socket buffersize */
349 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
350 return 0;
351 /* Yargs. It didn't work out. */
352out_no_root:
353 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
354 if (!IS_ERR(root_inode))
355 iput(root_inode);
356 return no_root_error;
357}
358
359/*
360 * Create an RPC client handle.
361 */
362static struct rpc_clnt *
363nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
364{
365 struct rpc_timeout timeparms;
366 struct rpc_xprt *xprt = NULL;
367 struct rpc_clnt *clnt = NULL;
368 int tcp = (data->flags & NFS_MOUNT_TCP);
369
370 /* Initialize timeout values */
371 timeparms.to_initval = data->timeo * HZ / 10;
372 timeparms.to_retries = data->retrans;
373 timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT;
374 timeparms.to_exponential = 1;
375
376 if (!timeparms.to_initval)
377 timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10;
378 if (!timeparms.to_retries)
379 timeparms.to_retries = 5;
380
381 /* create transport and client */
382 xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP,
383 &server->addr, &timeparms);
384 if (IS_ERR(xprt)) {
9085bbcb
TM		 385 dprintk("%s: cannot create RPC transport. Error = %ld\n",
386 __FUNCTION__, PTR_ERR(xprt));
1da177e4
LT		 387 return (struct rpc_clnt *)xprt;
388 }
389 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
390 server->rpc_ops->version, data->pseudoflavor);
391 if (IS_ERR(clnt)) {
9085bbcb
TM		 392 dprintk("%s: cannot create RPC client. Error = %ld\n",
393 __FUNCTION__, PTR_ERR(xprt));
1da177e4
LT		 394 goto out_fail;
395 }
396
397 clnt->cl_intr = 1;
398 clnt->cl_softrtry = 1;
399 clnt->cl_chatty = 1;
400
401 return clnt;
402
403out_fail:
1da177e4
LT		 404 return clnt;
405}
406
407/*
408 * The way this works is that the mount process passes a structure
409 * in the data argument which contains the server's IP address
410 * and the root file handle obtained from the server's mount
411 * daemon. We stash these away in the private superblock fields.
412 */
413static int
414nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
415{
416 struct nfs_server *server;
417 rpc_authflavor_t authflavor;
418
419 server = NFS_SB(sb);
420 sb->s_blocksize_bits = 0;
421 sb->s_blocksize = 0;
422 if (data->bsize)
423 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
424 if (data->rsize)
425 server->rsize = nfs_block_size(data->rsize, NULL);
426 if (data->wsize)
427 server->wsize = nfs_block_size(data->wsize, NULL);
428 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
429
430 server->acregmin = data->acregmin*HZ;
431 server->acregmax = data->acregmax*HZ;
432 server->acdirmin = data->acdirmin*HZ;
433 server->acdirmax = data->acdirmax*HZ;
434
435 /* Start lockd here, before we might error out */
436 if (!(server->flags & NFS_MOUNT_NONLM))
437 lockd_up();
438
439 server->namelen = data->namlen;
440 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
441 if (!server->hostname)
442 return -ENOMEM;
443 strcpy(server->hostname, data->hostname);
444
445 /* Check NFS protocol revision and initialize RPC op vector
446 * and file handle pool. */
1da177e4 447#ifdef CONFIG_NFS_V3
9085bbcb 448 if (server->flags & NFS_MOUNT_VER3) {
1da177e4
LT		 449 server->rpc_ops = &nfs_v3_clientops;
450 server->caps |= NFS_CAP_READDIRPLUS;
1da177e4
LT		 451 } else {
452 server->rpc_ops = &nfs_v2_clientops;
453 }
9085bbcb
TM		 454#else
455 server->rpc_ops = &nfs_v2_clientops;
456#endif
1da177e4
LT		 457
458 /* Fill in pseudoflavor for mount version < 5 */
459 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
460 data->pseudoflavor = RPC_AUTH_UNIX;
461 authflavor = data->pseudoflavor; /* save for sb_init() */
462 /* XXX maybe we want to add a server->pseudoflavor field */
463
464 /* Create RPC client handles */
465 server->client = nfs_create_client(server, data);
466 if (IS_ERR(server->client))
467 return PTR_ERR(server->client);
468 /* RFC 2623, sec 2.3.2 */
469 if (authflavor != RPC_AUTH_UNIX) {
6a19275a
BF		 470 struct rpc_auth *auth;
471
1da177e4
LT		 472 server->client_sys = rpc_clone_client(server->client);
473 if (IS_ERR(server->client_sys))
474 return PTR_ERR(server->client_sys);
6a19275a
BF		 475 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
476 if (IS_ERR(auth))
477 return PTR_ERR(auth);
1da177e4
LT		 478 } else {
479 atomic_inc(&server->client->cl_count);
480 server->client_sys = server->client;
481 }
1da177e4 482 if (server->flags & NFS_MOUNT_VER3) {
b7fa0554
AG		 483#ifdef CONFIG_NFS_V3_ACL
484 if (!(server->flags & NFS_MOUNT_NOACL)) {
485 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
486 /* No errors! Assume that Sun nfsacls are supported */
487 if (!IS_ERR(server->client_acl))
488 server->caps |= NFS_CAP_ACLS;
489 }
490#else
491 server->flags &= ~NFS_MOUNT_NOACL;
492#endif /* CONFIG_NFS_V3_ACL */
055ffbea
AG		 493 /*
494 * The VFS shouldn't apply the umask to mode bits. We will
495 * do so ourselves when necessary.
496 */
497 sb->s_flags |= MS_POSIXACL;
1da177e4
LT		 498 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
499 server->namelen = NFS3_MAXNAMLEN;
500 sb->s_time_gran = 1;
501 } else {
502 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
503 server->namelen = NFS2_MAXNAMLEN;
504 }
505
506 sb->s_op = &nfs_sops;
507 return nfs_sb_init(sb, authflavor);
508}
509
510static int
511nfs_statfs(struct super_block *sb, struct kstatfs *buf)
512{
513 struct nfs_server *server = NFS_SB(sb);
514 unsigned char blockbits;
515 unsigned long blockres;
516 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
517 struct nfs_fattr fattr;
518 struct nfs_fsstat res = {
519 .fattr = &fattr,
520 };
521 int error;
522
523 lock_kernel();
524
525 error = server->rpc_ops->statfs(server, rootfh, &res);
526 buf->f_type = NFS_SUPER_MAGIC;
527 if (error < 0)
528 goto out_err;
529
530 /*
531 * Current versions of glibc do not correctly handle the
532 * case where f_frsize != f_bsize. Eventually we want to
533 * report the value of wtmult in this field.
534 */
535 buf->f_frsize = sb->s_blocksize;
536
537 /*
538 * On most *nix systems, f_blocks, f_bfree, and f_bavail
539 * are reported in units of f_frsize. Linux hasn't had
540 * an f_frsize field in its statfs struct until recently,
541 * thus historically Linux's sys_statfs reports these
542 * fields in units of f_bsize.
543 */
544 buf->f_bsize = sb->s_blocksize;
545 blockbits = sb->s_blocksize_bits;
546 blockres = (1 << blockbits) - 1;
547 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
548 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
549 buf->f_bavail = (res.abytes + blockres) >> blockbits;
550
551 buf->f_files = res.tfiles;
552 buf->f_ffree = res.afiles;
553
554 buf->f_namelen = server->namelen;
555 out:
556 unlock_kernel();
557
558 return 0;
559
560 out_err:
561 printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error);
562 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
563 goto out;
564
565}
566
567static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
568{
569 static struct proc_nfs_info {
570 int flag;
571 char *str;
572 char *nostr;
573 } nfs_info[] = {
574 { NFS_MOUNT_SOFT, ",soft", ",hard" },
575 { NFS_MOUNT_INTR, ",intr", "" },
576 { NFS_MOUNT_POSIX, ",posix", "" },
577 { NFS_MOUNT_TCP, ",tcp", ",udp" },
578 { NFS_MOUNT_NOCTO, ",nocto", "" },
579 { NFS_MOUNT_NOAC, ",noac", "" },
580 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
b7fa0554 581 { NFS_MOUNT_NOACL, ",noacl", "" },
1da177e4
LT		 582 { 0, NULL, NULL }
583 };
584 struct proc_nfs_info *nfs_infop;
585 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
586
587 seq_printf(m, ",v%d", nfss->rpc_ops->version);
588 seq_printf(m, ",rsize=%d", nfss->rsize);
589 seq_printf(m, ",wsize=%d", nfss->wsize);
590 if (nfss->acregmin != 3*HZ)
591 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
592 if (nfss->acregmax != 60*HZ)
593 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
594 if (nfss->acdirmin != 30*HZ)
595 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
596 if (nfss->acdirmax != 60*HZ)
597 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
598 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
599 if (nfss->flags & nfs_infop->flag)
600 seq_puts(m, nfs_infop->str);
601 else
602 seq_puts(m, nfs_infop->nostr);
603 }
604 seq_puts(m, ",addr=");
605 seq_escape(m, nfss->hostname, " \t\n\\");
606 return 0;
607}
608
609/*
610 * Invalidate the local caches
611 */
612void
613nfs_zap_caches(struct inode *inode)
614{
615 struct nfs_inode *nfsi = NFS_I(inode);
616 int mode = inode->i_mode;
617
618 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
619 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
620
621 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
622 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
ada70d94 623 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1da177e4 624 else
ada70d94
TM		 625 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
626}
627
628static void nfs_zap_acl_cache(struct inode *inode)
629{
630 void (*clear_acl_cache)(struct inode *);
631
632 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
633 if (clear_acl_cache != NULL)
634 clear_acl_cache(inode);
635 NFS_I(inode)->flags &= ~NFS_INO_INVALID_ACL;
1da177e4
LT		 636}
637
638/*
639 * Invalidate, but do not unhash, the inode
640 */
641static void
642nfs_invalidate_inode(struct inode *inode)
643{
644 umode_t save_mode = inode->i_mode;
645
646 make_bad_inode(inode);
647 inode->i_mode = save_mode;
648 nfs_zap_caches(inode);
649}
650
651struct nfs_find_desc {
652 struct nfs_fh *fh;
653 struct nfs_fattr *fattr;
654};
655
656/*
657 * In NFSv3 we can have 64bit inode numbers. In order to support
658 * this, and re-exported directories (also seen in NFSv2)
659 * we are forced to allow 2 different inodes to have the same
660 * i_ino.
661 */
662static int
663nfs_find_actor(struct inode *inode, void *opaque)
664{
665 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
666 struct nfs_fh *fh = desc->fh;
667 struct nfs_fattr *fattr = desc->fattr;
668
669 if (NFS_FILEID(inode) != fattr->fileid)
670 return 0;
671 if (nfs_compare_fh(NFS_FH(inode), fh))
672 return 0;
673 if (is_bad_inode(inode) || NFS_STALE(inode))
674 return 0;
675 return 1;
676}
677
678static int
679nfs_init_locked(struct inode *inode, void *opaque)
680{
681 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
682 struct nfs_fattr *fattr = desc->fattr;
683
684 NFS_FILEID(inode) = fattr->fileid;
685 nfs_copy_fh(NFS_FH(inode), desc->fh);
686 return 0;
687}
688
689/* Don't use READDIRPLUS on directories that we believe are too large */
690#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
691
692/*
693 * This is our front-end to iget that looks up inodes by file handle
694 * instead of inode number.
695 */
696struct inode *
697nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
698{
699 struct nfs_find_desc desc = {
700 .fh = fh,
701 .fattr = fattr
702 };
703 struct inode *inode = NULL;
704 unsigned long hash;
705
706 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
707 goto out_no_inode;
708
709 if (!fattr->nlink) {
710 printk("NFS: Buggy server - nlink == 0!\n");
711 goto out_no_inode;
712 }
713
714 hash = nfs_fattr_to_ino_t(fattr);
715
716 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
717 goto out_no_inode;
718
719 if (inode->i_state & I_NEW) {
720 struct nfs_inode *nfsi = NFS_I(inode);
721
722 /* We set i_ino for the few things that still rely on it,
723 * such as stat(2) */
724 inode->i_ino = hash;
725
726 /* We can't support update_atime(), since the server will reset it */
727 inode->i_flags |= S_NOATIME|S_NOCMTIME;
728 inode->i_mode = fattr->mode;
729 /* Why so? Because we want revalidate for devices/FIFOs, and
730 * that's precisely what we have in nfs_file_inode_operations.
731 */
92cfc62c 732 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
1da177e4
LT		 733 if (S_ISREG(inode->i_mode)) {
734 inode->i_fop = &nfs_file_operations;
735 inode->i_data.a_ops = &nfs_file_aops;
736 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
737 } else if (S_ISDIR(inode->i_mode)) {
738 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
739 inode->i_fop = &nfs_dir_operations;
740 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
741 && fattr->size <= NFS_LIMIT_READDIRPLUS)
742 NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS;
743 } else if (S_ISLNK(inode->i_mode))
744 inode->i_op = &nfs_symlink_inode_operations;
745 else
746 init_special_inode(inode, inode->i_mode, fattr->rdev);
747
748 nfsi->read_cache_jiffies = fattr->timestamp;
749 inode->i_atime = fattr->atime;
750 inode->i_mtime = fattr->mtime;
751 inode->i_ctime = fattr->ctime;
752 if (fattr->valid & NFS_ATTR_FATTR_V4)
753 nfsi->change_attr = fattr->change_attr;
754 inode->i_size = nfs_size_to_loff_t(fattr->size);
755 inode->i_nlink = fattr->nlink;
756 inode->i_uid = fattr->uid;
757 inode->i_gid = fattr->gid;
758 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
759 /*
760 * report the blocks in 512byte units
761 */
762 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
763 inode->i_blksize = inode->i_sb->s_blocksize;
764 } else {
765 inode->i_blocks = fattr->du.nfs2.blocks;
766 inode->i_blksize = fattr->du.nfs2.blocksize;
767 }
768 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
769 nfsi->attrtimeo_timestamp = jiffies;
770 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
771 nfsi->cache_access.cred = NULL;
772
773 unlock_new_inode(inode);
774 } else
775 nfs_refresh_inode(inode, fattr);
776 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
777 inode->i_sb->s_id,
778 (long long)NFS_FILEID(inode),
779 atomic_read(&inode->i_count));
780
781out:
782 return inode;
783
784out_no_inode:
785 printk("nfs_fhget: iget failed\n");
786 goto out;
787}
788
789#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
790
791int
792nfs_setattr(struct dentry *dentry, struct iattr *attr)
793{
794 struct inode *inode = dentry->d_inode;
795 struct nfs_fattr fattr;
796 int error;
797
798 if (attr->ia_valid & ATTR_SIZE) {
799 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
800 attr->ia_valid &= ~ATTR_SIZE;
801 }
802
803 /* Optimization: if the end result is no change, don't RPC */
804 attr->ia_valid &= NFS_VALID_ATTRS;
805 if (attr->ia_valid == 0)
806 return 0;
807
808 lock_kernel();
809 nfs_begin_data_update(inode);
810 /* Write all dirty data if we're changing file permissions or size */
811 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
812 if (filemap_fdatawrite(inode->i_mapping) == 0)
813 filemap_fdatawait(inode->i_mapping);
814 nfs_wb_all(inode);
815 }
816 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
817 if (error == 0) {
818 nfs_refresh_inode(inode, &fattr);
819 if ((attr->ia_valid & ATTR_MODE) != 0) {
820 int mode;
821 mode = inode->i_mode & ~S_IALLUGO;
822 mode |= attr->ia_mode & S_IALLUGO;
823 inode->i_mode = mode;
824 }
825 if ((attr->ia_valid & ATTR_UID) != 0)
826 inode->i_uid = attr->ia_uid;
827 if ((attr->ia_valid & ATTR_GID) != 0)
828 inode->i_gid = attr->ia_gid;
829 if ((attr->ia_valid & ATTR_SIZE) != 0) {
830 inode->i_size = attr->ia_size;
831 vmtruncate(inode, attr->ia_size);
832 }
833 }
834 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
ada70d94 835 NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1da177e4
LT		 836 nfs_end_data_update(inode);
837 unlock_kernel();
838 return error;
839}
840
841/*
842 * Wait for the inode to get unlocked.
843 * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING).
844 */
845static int
846nfs_wait_on_inode(struct inode *inode, int flag)
847{
848 struct rpc_clnt *clnt = NFS_CLIENT(inode);
849 struct nfs_inode *nfsi = NFS_I(inode);
850
851 int error;
852 if (!(NFS_FLAGS(inode) & flag))
853 return 0;
854 atomic_inc(&inode->i_count);
855 error = nfs_wait_event(clnt, nfsi->nfs_i_wait,
856 !(NFS_FLAGS(inode) & flag));
857 iput(inode);
858 return error;
859}
860
861int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
862{
863 struct inode *inode = dentry->d_inode;
864 struct nfs_inode *nfsi = NFS_I(inode);
865 int need_atime = nfsi->flags & NFS_INO_INVALID_ATIME;
866 int err;
867
868 if (__IS_FLG(inode, MS_NOATIME))
869 need_atime = 0;
870 else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
871 need_atime = 0;
872 /* We may force a getattr if the user cares about atime */
873 if (need_atime)
874 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
875 else
876 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
877 if (!err)
878 generic_fillattr(inode, stat);
879 return err;
880}
881
882struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
883{
884 struct nfs_open_context *ctx;
885
886 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
887 if (ctx != NULL) {
888 atomic_set(&ctx->count, 1);
889 ctx->dentry = dget(dentry);
890 ctx->cred = get_rpccred(cred);
891 ctx->state = NULL;
892 ctx->lockowner = current->files;
893 ctx->error = 0;
00a92642 894 ctx->dir_cookie = 0;
1da177e4
LT		 895 }
896 return ctx;
897}
898
899struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
900{
901 if (ctx != NULL)
902 atomic_inc(&ctx->count);
903 return ctx;
904}
905
906void put_nfs_open_context(struct nfs_open_context *ctx)
907{
908 if (atomic_dec_and_test(&ctx->count)) {
909 if (!list_empty(&ctx->list)) {
910 struct inode *inode = ctx->dentry->d_inode;
911 spin_lock(&inode->i_lock);
912 list_del(&ctx->list);
913 spin_unlock(&inode->i_lock);
914 }
915 if (ctx->state != NULL)
916 nfs4_close_state(ctx->state, ctx->mode);
917 if (ctx->cred != NULL)
918 put_rpccred(ctx->cred);
919 dput(ctx->dentry);
920 kfree(ctx);
921 }
922}
923
924/*
925 * Ensure that mmap has a recent RPC credential for use when writing out
926 * shared pages
927 */
928void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
929{
930 struct inode *inode = filp->f_dentry->d_inode;
931 struct nfs_inode *nfsi = NFS_I(inode);
932
933 filp->private_data = get_nfs_open_context(ctx);
934 spin_lock(&inode->i_lock);
935 list_add(&ctx->list, &nfsi->open_files);
936 spin_unlock(&inode->i_lock);
937}
938
939struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode)
940{
941 struct nfs_inode *nfsi = NFS_I(inode);
942 struct nfs_open_context *pos, *ctx = NULL;
943
944 spin_lock(&inode->i_lock);
945 list_for_each_entry(pos, &nfsi->open_files, list) {
946 if ((pos->mode & mode) == mode) {
947 ctx = get_nfs_open_context(pos);
948 break;
949 }
950 }
951 spin_unlock(&inode->i_lock);
952 return ctx;
953}
954
955void nfs_file_clear_open_context(struct file *filp)
956{
957 struct inode *inode = filp->f_dentry->d_inode;
958 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
959
960 if (ctx) {
961 filp->private_data = NULL;
962 spin_lock(&inode->i_lock);
963 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
964 spin_unlock(&inode->i_lock);
965 put_nfs_open_context(ctx);
966 }
967}
968
969/*
970 * These allocate and release file read/write context information.
971 */
972int nfs_open(struct inode *inode, struct file *filp)
973{
974 struct nfs_open_context *ctx;
975 struct rpc_cred *cred;
976
977 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
978 if (IS_ERR(cred))
979 return PTR_ERR(cred);
980 ctx = alloc_nfs_open_context(filp->f_dentry, cred);
981 put_rpccred(cred);
982 if (ctx == NULL)
983 return -ENOMEM;
984 ctx->mode = filp->f_mode;
985 nfs_file_set_open_context(filp, ctx);
986 put_nfs_open_context(ctx);
987 if ((filp->f_mode & FMODE_WRITE) != 0)
988 nfs_begin_data_update(inode);
989 return 0;
990}
991
992int nfs_release(struct inode *inode, struct file *filp)
993{
994 if ((filp->f_mode & FMODE_WRITE) != 0)
995 nfs_end_data_update(inode);
996 nfs_file_clear_open_context(filp);
997 return 0;
998}
999
1000/*
1001 * This function is called whenever some part of NFS notices that
1002 * the cached attributes have to be refreshed.
1003 */
1004int
1005__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1006{
1007 int status = -ESTALE;
1008 struct nfs_fattr fattr;
1009 struct nfs_inode *nfsi = NFS_I(inode);
1010 unsigned long verifier;
1011 unsigned int flags;
1012
1013 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1014 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1015
1016 lock_kernel();
1017 if (!inode || is_bad_inode(inode))
1018 goto out_nowait;
1019 if (NFS_STALE(inode))
1020 goto out_nowait;
1021
1022 while (NFS_REVALIDATING(inode)) {
1023 status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING);
1024 if (status < 0)
1025 goto out_nowait;
1026 if (NFS_ATTRTIMEO(inode) == 0)
1027 continue;
1028 if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME))
1029 continue;
1030 status = NFS_STALE(inode) ? -ESTALE : 0;
1031 goto out_nowait;
1032 }
1033 NFS_FLAGS(inode) |= NFS_INO_REVALIDATING;
1034
1035 /* Protect against RPC races by saving the change attribute */
1036 verifier = nfs_save_change_attribute(inode);
1037 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1038 if (status != 0) {
1039 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1040 inode->i_sb->s_id,
1041 (long long)NFS_FILEID(inode), status);
1042 if (status == -ESTALE) {
1043 nfs_zap_caches(inode);
1044 if (!S_ISDIR(inode->i_mode))
1045 NFS_FLAGS(inode) |= NFS_INO_STALE;
1046 }
1047 goto out;
1048 }
1049
1050 status = nfs_update_inode(inode, &fattr, verifier);
1051 if (status) {
1052 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1053 inode->i_sb->s_id,
1054 (long long)NFS_FILEID(inode), status);
1055 goto out;
1056 }
1057 flags = nfsi->flags;
1058 /*
1059 * We may need to keep the attributes marked as invalid if
1060 * we raced with nfs_end_attr_update().
1061 */
1062 if (verifier == nfsi->cache_change_attribute)
1063 nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1064 /* Do the page cache invalidation */
1065 if (flags & NFS_INO_INVALID_DATA) {
1066 if (S_ISREG(inode->i_mode)) {
1067 if (filemap_fdatawrite(inode->i_mapping) == 0)
1068 filemap_fdatawait(inode->i_mapping);
1069 nfs_wb_all(inode);
1070 }
1071 nfsi->flags &= ~NFS_INO_INVALID_DATA;
1072 invalidate_inode_pages2(inode->i_mapping);
1073 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
1074 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1075 inode->i_sb->s_id,
1076 (long long)NFS_FILEID(inode));
1077 /* This ensures we revalidate dentries */
1078 nfsi->cache_change_attribute++;
1079 }
ada70d94
TM		 1080 if (flags & NFS_INO_INVALID_ACL)
1081 nfs_zap_acl_cache(inode);
1da177e4
LT		 1082 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1083 inode->i_sb->s_id,
1084 (long long)NFS_FILEID(inode));
1085
1086out:
1087 NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING;
1088 wake_up(&nfsi->nfs_i_wait);
1089 out_nowait:
1090 unlock_kernel();
1091 return status;
1092}
1093
1094int nfs_attribute_timeout(struct inode *inode)
1095{
1096 struct nfs_inode *nfsi = NFS_I(inode);
1097
1098 if (nfs_have_delegation(inode, FMODE_READ))
1099 return 0;
1100 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1101}
1102
1103/**
1104 * nfs_revalidate_inode - Revalidate the inode attributes
1105 * @server - pointer to nfs_server struct
1106 * @inode - pointer to inode struct
1107 *
1108 * Updates inode attribute information by retrieving the data from the server.
1109 */
1110int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1111{
1112 if (!(NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1113 && !nfs_attribute_timeout(inode))
1114 return NFS_STALE(inode) ? -ESTALE : 0;
1115 return __nfs_revalidate_inode(server, inode);
1116}
1117
1118/**
1119 * nfs_begin_data_update
1120 * @inode - pointer to inode
1121 * Declare that a set of operations will update file data on the server
1122 */
1123void nfs_begin_data_update(struct inode *inode)
1124{
1125 atomic_inc(&NFS_I(inode)->data_updates);
1126}
1127
1128/**
1129 * nfs_end_data_update
1130 * @inode - pointer to inode
1131 * Declare end of the operations that will update file data
1132 * This will mark the inode as immediately needing revalidation
1133 * of its attribute cache.
1134 */
1135void nfs_end_data_update(struct inode *inode)
1136{
1137 struct nfs_inode *nfsi = NFS_I(inode);
1138
1139 if (!nfs_have_delegation(inode, FMODE_READ)) {
1140 /* Mark the attribute cache for revalidation */
1141 nfsi->flags |= NFS_INO_INVALID_ATTR;
1142 /* Directories and symlinks: invalidate page cache too */
1143 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1144 nfsi->flags |= NFS_INO_INVALID_DATA;
1145 }
1146 nfsi->cache_change_attribute ++;
1147 atomic_dec(&nfsi->data_updates);
1148}
1149
1da177e4
LT		 1150/**
1151 * nfs_refresh_inode - verify consistency of the inode attribute cache
1152 * @inode - pointer to inode
1153 * @fattr - updated attributes
1154 *
1155 * Verifies the attribute cache. If we have just changed the attributes,
1156 * so that fattr carries weak cache consistency data, then it may
1157 * also update the ctime/mtime/change_attribute.
1158 */
1159int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1160{
1161 struct nfs_inode *nfsi = NFS_I(inode);
1162 loff_t cur_size, new_isize;
1163 int data_unstable;
1164
1165 /* Do we hold a delegation? */
1166 if (nfs_have_delegation(inode, FMODE_READ))
1167 return 0;
1168
1169 /* Are we in the process of updating data on the server? */
1170 data_unstable = nfs_caches_unstable(inode);
1171
1172 if (fattr->valid & NFS_ATTR_FATTR_V4) {
1173 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1174 && nfsi->change_attr == fattr->pre_change_attr)
1175 nfsi->change_attr = fattr->change_attr;
1176 if (!data_unstable && nfsi->change_attr != fattr->change_attr)
1177 nfsi->flags |= NFS_INO_INVALID_ATTR;
1178 }
1179
1180 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1181 return 0;
1182
1183 /* Has the inode gone and changed behind our back? */
1184 if (nfsi->fileid != fattr->fileid
1185 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1186 return -EIO;
1187
1188 cur_size = i_size_read(inode);
1189 new_isize = nfs_size_to_loff_t(fattr->size);
1190
1191 /* If we have atomic WCC data, we may update some attributes */
1192 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1193 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
1194 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1195 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
1196 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1197 }
1198
1199 /* Verify a few of the more important attributes */
1200 if (!data_unstable) {
1201 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)
1202 || cur_size != new_isize)
1203 nfsi->flags |= NFS_INO_INVALID_ATTR;
951a143b
TM		 1204 } else if (new_isize != cur_size && nfsi->npages == 0)
1205 nfsi->flags |= NFS_INO_INVALID_ATTR;
1da177e4
LT		 1206
1207 /* Have any file permissions changed? */
1208 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1209 || inode->i_uid != fattr->uid
1210 || inode->i_gid != fattr->gid)
ada70d94 1211 nfsi->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1da177e4
LT		 1212
1213 /* Has the link count changed? */
1214 if (inode->i_nlink != fattr->nlink)
1215 nfsi->flags |= NFS_INO_INVALID_ATTR;
1216
1217 if (!timespec_equal(&inode->i_atime, &fattr->atime))
1218 nfsi->flags |= NFS_INO_INVALID_ATIME;
1219
1220 nfsi->read_cache_jiffies = fattr->timestamp;
1221 return 0;
1222}
1223
1224/*
1225 * Many nfs protocol calls return the new file attributes after
1226 * an operation. Here we update the inode to reflect the state
1227 * of the server's inode.
1228 *
1229 * This is a bit tricky because we have to make sure all dirty pages
1230 * have been sent off to the server before calling invalidate_inode_pages.
1231 * To make sure no other process adds more write requests while we try
1232 * our best to flush them, we make them sleep during the attribute refresh.
1233 *
1234 * A very similar scenario holds for the dir cache.
1235 */
1236static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
1237{
1238 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1239 loff_t cur_isize, new_isize;
1da177e4 1240 unsigned int invalid = 0;
1da177e4
LT		 1241 int data_unstable;
1242
1243 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1244 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1245 atomic_read(&inode->i_count), fattr->valid);
1246
1247 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1248 return 0;
1249
1250 if (nfsi->fileid != fattr->fileid) {
1251 printk(KERN_ERR "%s: inode number mismatch\n"
1252 "expected (%s/0x%Lx), got (%s/0x%Lx)\n",
1253 __FUNCTION__,
1254 inode->i_sb->s_id, (long long)nfsi->fileid,
1255 inode->i_sb->s_id, (long long)fattr->fileid);
1256 goto out_err;
1257 }
1258
1259 /*
1260 * Make sure the inode's type hasn't changed.
1261 */
1262 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1263 goto out_changed;
1264
1265 /*
1266 * Update the read time so we don't revalidate too often.
1267 */
1268 nfsi->read_cache_jiffies = fattr->timestamp;
1269
1270 /* Are we racing with known updates of the metadata on the server? */
1271 data_unstable = ! nfs_verify_change_attribute(inode, verifier);
1272
951a143b 1273 /* Check if our cached file size is stale */
1da177e4
LT		 1274 new_isize = nfs_size_to_loff_t(fattr->size);
1275 cur_isize = i_size_read(inode);
951a143b
TM		 1276 if (new_isize != cur_isize) {
1277 /* Do we perhaps have any outstanding writes? */
1278 if (nfsi->npages == 0) {
1279 /* No, but did we race with nfs_end_data_update()? */
1280 if (verifier == nfsi->cache_change_attribute) {
1da177e4 1281 inode->i_size = new_isize;
951a143b 1282 invalid |= NFS_INO_INVALID_DATA;
1da177e4 1283 }
951a143b
TM		 1284 invalid |= NFS_INO_INVALID_ATTR;
1285 } else if (new_isize > cur_isize) {
1da177e4
LT		 1286 inode->i_size = new_isize;
1287 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1288 }
951a143b
TM		 1289 dprintk("NFS: isize change on server for file %s/%ld\n",
1290 inode->i_sb->s_id, inode->i_ino);
1da177e4
LT		 1291 }
1292
951a143b 1293 /* Check if the mtime agrees */
1da177e4
LT		 1294 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1295 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
951a143b
TM		 1296 dprintk("NFS: mtime change on server for file %s/%ld\n",
1297 inode->i_sb->s_id, inode->i_ino);
1da177e4
LT		 1298 if (!data_unstable)
1299 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1300 }
1301
1302 if ((fattr->valid & NFS_ATTR_FATTR_V4)
1303 && nfsi->change_attr != fattr->change_attr) {
951a143b 1304 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1da177e4 1305 inode->i_sb->s_id, inode->i_ino);
1da177e4
LT		 1306 nfsi->change_attr = fattr->change_attr;
1307 if (!data_unstable)
ada70d94 1308 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1da177e4
LT		 1309 }
1310
ada70d94
TM		 1311 /* If ctime has changed we should definitely clear access+acl caches */
1312 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1313 if (!data_unstable)
1314 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1315 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1316 }
1da177e4
LT		 1317 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1318
1319 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1320 inode->i_uid != fattr->uid ||
1321 inode->i_gid != fattr->gid)
ada70d94 1322 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1da177e4
LT		 1323
1324 inode->i_mode = fattr->mode;
1325 inode->i_nlink = fattr->nlink;
1326 inode->i_uid = fattr->uid;
1327 inode->i_gid = fattr->gid;
1328
1329 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1330 /*
1331 * report the blocks in 512byte units
1332 */
1333 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1334 inode->i_blksize = inode->i_sb->s_blocksize;
1335 } else {
1336 inode->i_blocks = fattr->du.nfs2.blocks;
1337 inode->i_blksize = fattr->du.nfs2.blocksize;
1338 }
1339
1340 /* Update attrtimeo value if we're out of the unstable period */
1341 if (invalid & NFS_INO_INVALID_ATTR) {
1342 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1343 nfsi->attrtimeo_timestamp = jiffies;
1344 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1345 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1346 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1347 nfsi->attrtimeo_timestamp = jiffies;
1348 }
1349 /* Don't invalidate the data if we were to blame */
1350 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1351 || S_ISLNK(inode->i_mode)))
1352 invalid &= ~NFS_INO_INVALID_DATA;
1353 if (!nfs_have_delegation(inode, FMODE_READ))
1354 nfsi->flags |= invalid;
1355
1356 return 0;
1357 out_changed:
1358 /*
1359 * Big trouble! The inode has become a different object.
1360 */
1361#ifdef NFS_PARANOIA
1362 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1363 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1364#endif
1365 /*
1366 * No need to worry about unhashing the dentry, as the
1367 * lookup validation will know that the inode is bad.
1368 * (But we fall through to invalidate the caches.)
1369 */
1370 nfs_invalidate_inode(inode);
1371 out_err:
1372 NFS_FLAGS(inode) |= NFS_INO_STALE;
1373 return -ESTALE;
1374}
1375
1376/*
1377 * File system information
1378 */
1379
1380static int nfs_set_super(struct super_block *s, void *data)
1381{
1382 s->s_fs_info = data;
1383 return set_anon_super(s, data);
1384}
1385
1386static int nfs_compare_super(struct super_block *sb, void *data)
1387{
1388 struct nfs_server *server = data;
1389 struct nfs_server *old = NFS_SB(sb);
1390
1391 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1392 return 0;
1393 if (old->addr.sin_port != server->addr.sin_port)
1394 return 0;
1395 return !nfs_compare_fh(&old->fh, &server->fh);
1396}
1397
1398static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1399 int flags, const char *dev_name, void *raw_data)
1400{
1401 int error;
9085bbcb 1402 struct nfs_server *server = NULL;
1da177e4
LT		 1403 struct super_block *s;
1404 struct nfs_fh *root;
1405 struct nfs_mount_data *data = raw_data;
1406
9085bbcb
TM		 1407 s = ERR_PTR(-EINVAL);
1408 if (data == NULL) {
1409 dprintk("%s: missing data argument\n", __FUNCTION__);
1410 goto out_err;
1411 }
1412 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1413 dprintk("%s: bad mount version\n", __FUNCTION__);
1414 goto out_err;
1da177e4 1415 }
9085bbcb
TM		 1416 switch (data->version) {
1417 case 1:
1418 data->namlen = 0;
1419 case 2:
1420 data->bsize = 0;
1421 case 3:
1422 if (data->flags & NFS_MOUNT_VER3) {
1423 dprintk("%s: mount structure version %d does not support NFSv3\n",
1424 __FUNCTION__,
1425 data->version);
1426 goto out_err;
1427 }
1428 data->root.size = NFS2_FHSIZE;
1429 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1430 case 4:
1431 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1432 dprintk("%s: mount structure version %d does not support strong security\n",
1433 __FUNCTION__,
1434 data->version);
1435 goto out_err;
1436 }
1437 case 5:
1438 memset(data->context, 0, sizeof(data->context));
1439 }
1440#ifndef CONFIG_NFS_V3
1441 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1442 s = ERR_PTR(-EPROTONOSUPPORT);
1443 if (data->flags & NFS_MOUNT_VER3) {
1444 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1445 goto out_err;
1446 }
1447#endif /* CONFIG_NFS_V3 */
1da177e4 1448
9085bbcb 1449 s = ERR_PTR(-ENOMEM);
1da177e4
LT		 1450 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1451 if (!server)
9085bbcb 1452 goto out_err;
1da177e4
LT		 1453 memset(server, 0, sizeof(struct nfs_server));
1454 /* Zero out the NFS state stuff */
1455 init_nfsv4_state(server);
b7fa0554 1456 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1da177e4 1457
1da177e4
LT		 1458 root = &server->fh;
1459 if (data->flags & NFS_MOUNT_VER3)
1460 root->size = data->root.size;
1461 else
1462 root->size = NFS2_FHSIZE;
9085bbcb 1463 s = ERR_PTR(-EINVAL);
1da177e4 1464 if (root->size > sizeof(root->data)) {
9085bbcb
TM		 1465 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1466 goto out_err;
1da177e4
LT		 1467 }
1468 memcpy(root->data, data->root.data, root->size);
1469
1470 /* We now require that the mount process passes the remote address */
1471 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1472 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
9085bbcb
TM		 1473 dprintk("%s: mount program didn't pass remote address!\n",
1474 __FUNCTION__);
1475 goto out_err;
1da177e4
LT		 1476 }
1477
9085bbcb
TM		 1478 /* Fire up rpciod if not yet running */
1479 s = ERR_PTR(rpciod_up());
1480 if (IS_ERR(s)) {
1481 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1482 __FUNCTION__, PTR_ERR(s));
1483 goto out_err;
1da177e4
LT		 1484 }
1485
9085bbcb
TM		 1486 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1487 if (IS_ERR(s) || s->s_root)
1488 goto out_rpciod_down;
1da177e4 1489
9085bbcb 1490 s->s_flags = flags;
1da177e4
LT		 1491
1492 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1493 if (error) {
1494 up_write(&s->s_umount);
1495 deactivate_super(s);
1496 return ERR_PTR(error);
1497 }
1498 s->s_flags |= MS_ACTIVE;
1499 return s;
9085bbcb
TM		 1500out_rpciod_down:
1501 rpciod_down();
1502out_err:
1503 kfree(server);
1504 return s;
1da177e4
LT		 1505}
1506
1507static void nfs_kill_super(struct super_block *s)
1508{
1509 struct nfs_server *server = NFS_SB(s);
1510
1511 kill_anon_super(s);
1512
6a19275a 1513 if (!IS_ERR(server->client))
1da177e4 1514 rpc_shutdown_client(server->client);
6a19275a 1515 if (!IS_ERR(server->client_sys))
1da177e4 1516 rpc_shutdown_client(server->client_sys);
b7fa0554
AG		 1517 if (!IS_ERR(server->client_acl))
1518 rpc_shutdown_client(server->client_acl);
1da177e4
LT		 1519
1520 if (!(server->flags & NFS_MOUNT_NONLM))
1521 lockd_down(); /* release rpc.lockd */
1522
1523 rpciod_down(); /* release rpciod */
1524
1525 if (server->hostname != NULL)
1526 kfree(server->hostname);
1527 kfree(server);
1528}
1529
1530static struct file_system_type nfs_fs_type = {
1531 .owner = THIS_MODULE,
1532 .name = "nfs",
1533 .get_sb = nfs_get_sb,
1534 .kill_sb = nfs_kill_super,
1535 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1536};
1537
1538#ifdef CONFIG_NFS_V4
1539
1540static void nfs4_clear_inode(struct inode *);
1541
1542
1543static struct super_operations nfs4_sops = {
1544 .alloc_inode = nfs_alloc_inode,
1545 .destroy_inode = nfs_destroy_inode,
1546 .write_inode = nfs_write_inode,
1547 .delete_inode = nfs_delete_inode,
1548 .statfs = nfs_statfs,
1549 .clear_inode = nfs4_clear_inode,
1550 .umount_begin = nfs_umount_begin,
1551 .show_options = nfs_show_options,
1552};
1553
1554/*
1555 * Clean out any remaining NFSv4 state that might be left over due
1556 * to open() calls that passed nfs_atomic_lookup, but failed to call
1557 * nfs_open().
1558 */
1559static void nfs4_clear_inode(struct inode *inode)
1560{
1561 struct nfs_inode *nfsi = NFS_I(inode);
1562
1563 /* If we are holding a delegation, return it! */
1564 if (nfsi->delegation != NULL)
1565 nfs_inode_return_delegation(inode);
1566 /* First call standard NFS clear_inode() code */
1567 nfs_clear_inode(inode);
1568 /* Now clear out any remaining state */
1569 while (!list_empty(&nfsi->open_states)) {
1570 struct nfs4_state *state;
1571
1572 state = list_entry(nfsi->open_states.next,
1573 struct nfs4_state,
1574 inode_states);
1575 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1576 __FUNCTION__,
1577 inode->i_sb->s_id,
1578 (long long)NFS_FILEID(inode),
1579 state);
1580 BUG_ON(atomic_read(&state->count) != 1);
1581 nfs4_close_state(state, state->state);
1582 }
1583}
1584
1585
1586static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1587{
1588 struct nfs_server *server;
1589 struct nfs4_client *clp = NULL;
1590 struct rpc_xprt *xprt = NULL;
1591 struct rpc_clnt *clnt = NULL;
1592 struct rpc_timeout timeparms;
1593 rpc_authflavor_t authflavour;
1594 int proto, err = -EIO;
1595
1596 sb->s_blocksize_bits = 0;
1597 sb->s_blocksize = 0;
1598 server = NFS_SB(sb);
1599 if (data->rsize != 0)
1600 server->rsize = nfs_block_size(data->rsize, NULL);
1601 if (data->wsize != 0)
1602 server->wsize = nfs_block_size(data->wsize, NULL);
1603 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1604 server->caps = NFS_CAP_ATOMIC_OPEN;
1605
1606 server->acregmin = data->acregmin*HZ;
1607 server->acregmax = data->acregmax*HZ;
1608 server->acdirmin = data->acdirmin*HZ;
1609 server->acdirmax = data->acdirmax*HZ;
1610
1611 server->rpc_ops = &nfs_v4_clientops;
1612 /* Initialize timeout values */
1613
1614 timeparms.to_initval = data->timeo * HZ / 10;
1615 timeparms.to_retries = data->retrans;
1616 timeparms.to_exponential = 1;
1617 if (!timeparms.to_retries)
1618 timeparms.to_retries = 5;
1619
1620 proto = data->proto;
1621 /* Which IP protocol do we use? */
1622 switch (proto) {
1623 case IPPROTO_TCP:
1624 timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT;
1625 if (!timeparms.to_initval)
1626 timeparms.to_initval = 600 * HZ / 10;
1627 break;
1628 case IPPROTO_UDP:
1629 timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT;
1630 if (!timeparms.to_initval)
1631 timeparms.to_initval = 11 * HZ / 10;
1632 break;
1633 default:
1634 return -EINVAL;
1635 }
1636
1637 clp = nfs4_get_client(&server->addr.sin_addr);
1638 if (!clp) {
9085bbcb 1639 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1da177e4
LT		 1640 return -EIO;
1641 }
1642
1643 /* Now create transport and client */
1644 authflavour = RPC_AUTH_UNIX;
1645 if (data->auth_flavourlen != 0) {
9085bbcb
TM		 1646 if (data->auth_flavourlen != 1) {
1647 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1648 __FUNCTION__, data->auth_flavourlen);
1649 err = -EINVAL;
1650 goto out_fail;
1651 }
1da177e4
LT		 1652 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1653 err = -EFAULT;
1654 goto out_fail;
1655 }
1656 }
1657
1658 down_write(&clp->cl_sem);
6a19275a 1659 if (IS_ERR(clp->cl_rpcclient)) {
1da177e4
LT		 1660 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
1661 if (IS_ERR(xprt)) {
1662 up_write(&clp->cl_sem);
1da177e4 1663 err = PTR_ERR(xprt);
9085bbcb
TM		 1664 dprintk("%s: cannot create RPC transport. Error = %d\n",
1665 __FUNCTION__, err);
1da177e4
LT		 1666 goto out_fail;
1667 }
1668 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1669 server->rpc_ops->version, authflavour);
1670 if (IS_ERR(clnt)) {
1671 up_write(&clp->cl_sem);
1da177e4 1672 err = PTR_ERR(clnt);
9085bbcb
TM		 1673 dprintk("%s: cannot create RPC client. Error = %d\n",
1674 __FUNCTION__, err);
1da177e4
LT		 1675 goto out_fail;
1676 }
1677 clnt->cl_intr = 1;
1678 clnt->cl_softrtry = 1;
1679 clnt->cl_chatty = 1;
1680 clp->cl_rpcclient = clnt;
1681 clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
1682 if (IS_ERR(clp->cl_cred)) {
1683 up_write(&clp->cl_sem);
1684 err = PTR_ERR(clp->cl_cred);
1685 clp->cl_cred = NULL;
1686 goto out_fail;
1687 }
1688 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1689 nfs_idmap_new(clp);
1690 }
1691 if (list_empty(&clp->cl_superblocks)) {
1692 err = nfs4_init_client(clp);
1693 if (err != 0) {
1694 up_write(&clp->cl_sem);
1695 goto out_fail;
1696 }
1697 }
1698 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1699 clnt = rpc_clone_client(clp->cl_rpcclient);
1700 if (!IS_ERR(clnt))
1701 server->nfs4_state = clp;
1702 up_write(&clp->cl_sem);
1703 clp = NULL;
1704
1705 if (IS_ERR(clnt)) {
9085bbcb
TM		 1706 err = PTR_ERR(clnt);
1707 dprintk("%s: cannot create RPC client. Error = %d\n",
1708 __FUNCTION__, err);
1709 return err;
1da177e4
LT		 1710 }
1711
1712 server->client = clnt;
1713
1714 if (server->nfs4_state->cl_idmap == NULL) {
9085bbcb 1715 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1da177e4
LT		 1716 return -ENOMEM;
1717 }
1718
1719 if (clnt->cl_auth->au_flavor != authflavour) {
6a19275a
BF		 1720 struct rpc_auth *auth;
1721
1722 auth = rpcauth_create(authflavour, clnt);
1723 if (IS_ERR(auth)) {
9085bbcb 1724 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
6a19275a 1725 return PTR_ERR(auth);
1da177e4
LT		 1726 }
1727 }
1728
1729 sb->s_time_gran = 1;
1730
1731 sb->s_op = &nfs4_sops;
1732 err = nfs_sb_init(sb, authflavour);
1733 if (err == 0)
1734 return 0;
1735out_fail:
1736 if (clp)
1737 nfs4_put_client(clp);
1738 return err;
1739}
1740
1741static int nfs4_compare_super(struct super_block *sb, void *data)
1742{
1743 struct nfs_server *server = data;
1744 struct nfs_server *old = NFS_SB(sb);
1745
1746 if (strcmp(server->hostname, old->hostname) != 0)
1747 return 0;
1748 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1749 return 0;
1750 return 1;
1751}
1752
1753static void *
1754nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1755{
1756 void *p = NULL;
1757
1758 if (!src->len)
1759 return ERR_PTR(-EINVAL);
1760 if (src->len < maxlen)
1761 maxlen = src->len;
1762 if (dst == NULL) {
1763 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1764 if (p == NULL)
1765 return ERR_PTR(-ENOMEM);
1766 }
1767 if (copy_from_user(dst, src->data, maxlen)) {
1768 if (p != NULL)
1769 kfree(p);
1770 return ERR_PTR(-EFAULT);
1771 }
1772 dst[maxlen] = '\0';
1773 return dst;
1774}
1775
1776static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1777 int flags, const char *dev_name, void *raw_data)
1778{
1779 int error;
1780 struct nfs_server *server;
1781 struct super_block *s;
1782 struct nfs4_mount_data *data = raw_data;
1783 void *p;
1784
9085bbcb
TM		 1785 if (data == NULL) {
1786 dprintk("%s: missing data argument\n", __FUNCTION__);
1787 return ERR_PTR(-EINVAL);
1788 }
1789 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1790 dprintk("%s: bad mount version\n", __FUNCTION__);
1da177e4
LT		 1791 return ERR_PTR(-EINVAL);
1792 }
1793
1794 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1795 if (!server)
1796 return ERR_PTR(-ENOMEM);
1797 memset(server, 0, sizeof(struct nfs_server));
1798 /* Zero out the NFS state stuff */
1799 init_nfsv4_state(server);
b7fa0554 1800 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1da177e4 1801
1da177e4
LT		 1802 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1803 if (IS_ERR(p))
1804 goto out_err;
1805 server->hostname = p;
1806
1807 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1808 if (IS_ERR(p))
1809 goto out_err;
1810 server->mnt_path = p;
1811
1812 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1813 sizeof(server->ip_addr) - 1);
1814 if (IS_ERR(p))
1815 goto out_err;
1816
1817 /* We now require that the mount process passes the remote address */
1818 if (data->host_addrlen != sizeof(server->addr)) {
1819 s = ERR_PTR(-EINVAL);
1820 goto out_free;
1821 }
1822 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1823 s = ERR_PTR(-EFAULT);
1824 goto out_free;
1825 }
1826 if (server->addr.sin_family != AF_INET ||
1827 server->addr.sin_addr.s_addr == INADDR_ANY) {
9085bbcb
TM		 1828 dprintk("%s: mount program didn't pass remote IP address!\n",
1829 __FUNCTION__);
1da177e4
LT		 1830 s = ERR_PTR(-EINVAL);
1831 goto out_free;
1832 }
1833
9085bbcb
TM		 1834 /* Fire up rpciod if not yet running */
1835 s = ERR_PTR(rpciod_up());
1836 if (IS_ERR(s)) {
1837 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1838 __FUNCTION__, PTR_ERR(s));
1839 goto out_free;
1840 }
1841
1da177e4
LT		 1842 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1843
1844 if (IS_ERR(s) || s->s_root)
1845 goto out_free;
1846
1847 s->s_flags = flags;
1848
1da177e4
LT		 1849 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1850 if (error) {
1851 up_write(&s->s_umount);
1852 deactivate_super(s);
1853 return ERR_PTR(error);
1854 }
1855 s->s_flags |= MS_ACTIVE;
1856 return s;
1857out_err:
1858 s = (struct super_block *)p;
1859out_free:
1860 if (server->mnt_path)
1861 kfree(server->mnt_path);
1862 if (server->hostname)
1863 kfree(server->hostname);
1864 kfree(server);
1865 return s;
1866}
1867
1868static void nfs4_kill_super(struct super_block *sb)
1869{
1870 struct nfs_server *server = NFS_SB(sb);
1871
1872 nfs_return_all_delegations(sb);
1873 kill_anon_super(sb);
1874
1875 nfs4_renewd_prepare_shutdown(server);
1876
1877 if (server->client != NULL && !IS_ERR(server->client))
1878 rpc_shutdown_client(server->client);
1879 rpciod_down(); /* release rpciod */
1880
1881 destroy_nfsv4_state(server);
1882
1883 if (server->hostname != NULL)
1884 kfree(server->hostname);
1885 kfree(server);
1886}
1887
1888static struct file_system_type nfs4_fs_type = {
1889 .owner = THIS_MODULE,
1890 .name = "nfs4",
1891 .get_sb = nfs4_get_sb,
1892 .kill_sb = nfs4_kill_super,
1893 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1894};
1895
1896#define nfs4_init_once(nfsi) \
1897 do { \
1898 INIT_LIST_HEAD(&(nfsi)->open_states); \
1899 nfsi->delegation = NULL; \
1900 nfsi->delegation_state = 0; \
1901 init_rwsem(&nfsi->rwsem); \
1902 } while(0)
1903#define register_nfs4fs() register_filesystem(&nfs4_fs_type)
1904#define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
1905#else
1906#define nfs4_init_once(nfsi) \
1907 do { } while (0)
1908#define register_nfs4fs() (0)
1909#define unregister_nfs4fs()
1910#endif
1911
1912extern int nfs_init_nfspagecache(void);
1913extern void nfs_destroy_nfspagecache(void);
1914extern int nfs_init_readpagecache(void);
1915extern void nfs_destroy_readpagecache(void);
1916extern int nfs_init_writepagecache(void);
1917extern void nfs_destroy_writepagecache(void);
1918#ifdef CONFIG_NFS_DIRECTIO
1919extern int nfs_init_directcache(void);
1920extern void nfs_destroy_directcache(void);
1921#endif
1922
1923static kmem_cache_t * nfs_inode_cachep;
1924
1925static struct inode *nfs_alloc_inode(struct super_block *sb)
1926{
1927 struct nfs_inode *nfsi;
1928 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
1929 if (!nfsi)
1930 return NULL;
1931 nfsi->flags = 0;
458818ed
TM		 1932#ifdef CONFIG_NFS_V3_ACL
1933 nfsi->acl_access = ERR_PTR(-EAGAIN);
1934 nfsi->acl_default = ERR_PTR(-EAGAIN);
1935#endif
e50a1c2e
BF		 1936#ifdef CONFIG_NFS_V4
1937 nfsi->nfs4_acl = NULL;
1938#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 1939 return &nfsi->vfs_inode;
1940}
1941
1942static void nfs_destroy_inode(struct inode *inode)
1943{
1944 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1945}
1946
1947static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
1948{
1949 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1950
1951 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
1952 SLAB_CTOR_CONSTRUCTOR) {
1953 inode_init_once(&nfsi->vfs_inode);
1954 spin_lock_init(&nfsi->req_lock);
1955 INIT_LIST_HEAD(&nfsi->dirty);
1956 INIT_LIST_HEAD(&nfsi->commit);
1957 INIT_LIST_HEAD(&nfsi->open_files);
1958 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1959 atomic_set(&nfsi->data_updates, 0);
1960 nfsi->ndirty = 0;
1961 nfsi->ncommit = 0;
1962 nfsi->npages = 0;
1963 init_waitqueue_head(&nfsi->nfs_i_wait);
1964 nfs4_init_once(nfsi);
1965 }
1966}
1967
75c96f85 1968static int nfs_init_inodecache(void)
1da177e4
LT		 1969{
1970 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1971 sizeof(struct nfs_inode),
1972 0, SLAB_RECLAIM_ACCOUNT,
1973 init_once, NULL);
1974 if (nfs_inode_cachep == NULL)
1975 return -ENOMEM;
1976
1977 return 0;
1978}
1979
75c96f85 1980static void nfs_destroy_inodecache(void)
1da177e4
LT		 1981{
1982 if (kmem_cache_destroy(nfs_inode_cachep))
1983 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
1984}
1985
1986/*
1987 * Initialize NFS
1988 */
1989static int __init init_nfs_fs(void)
1990{
1991 int err;
1992
1993 err = nfs_init_nfspagecache();
1994 if (err)
1995 goto out4;
1996
1997 err = nfs_init_inodecache();
1998 if (err)
1999 goto out3;
2000
2001 err = nfs_init_readpagecache();
2002 if (err)
2003 goto out2;
2004
2005 err = nfs_init_writepagecache();
2006 if (err)
2007 goto out1;
2008
2009#ifdef CONFIG_NFS_DIRECTIO
2010 err = nfs_init_directcache();
2011 if (err)
2012 goto out0;
2013#endif
2014
2015#ifdef CONFIG_PROC_FS
2016 rpc_proc_register(&nfs_rpcstat);
2017#endif
2018 err = register_filesystem(&nfs_fs_type);
2019 if (err)
2020 goto out;
2021 if ((err = register_nfs4fs()) != 0)
2022 goto out;
2023 return 0;
2024out:
2025#ifdef CONFIG_PROC_FS
2026 rpc_proc_unregister("nfs");
2027#endif
2028 nfs_destroy_writepagecache();
2029#ifdef CONFIG_NFS_DIRECTIO
2030out0:
2031 nfs_destroy_directcache();
2032#endif
2033out1:
2034 nfs_destroy_readpagecache();
2035out2:
2036 nfs_destroy_inodecache();
2037out3:
2038 nfs_destroy_nfspagecache();
2039out4:
2040 return err;
2041}
2042
2043static void __exit exit_nfs_fs(void)
2044{
2045#ifdef CONFIG_NFS_DIRECTIO
2046 nfs_destroy_directcache();
2047#endif
2048 nfs_destroy_writepagecache();
2049 nfs_destroy_readpagecache();
2050 nfs_destroy_inodecache();
2051 nfs_destroy_nfspagecache();
2052#ifdef CONFIG_PROC_FS
2053 rpc_proc_unregister("nfs");
2054#endif
2055 unregister_filesystem(&nfs_fs_type);
2056 unregister_nfs4fs();
2057}
2058
2059/* Not quite true; I just maintain it */
2060MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2061MODULE_LICENSE("GPL");
2062
2063module_init(init_nfs_fs)
2064module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)