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[PATCH] NFS: use atomic bitops to manipulate flags in nfsi->flags
[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
3da28eb1 138 ret = nfs_commit_inode(inode, flags);
1da177e4
LT		 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))
55296809 623 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
1da177e4 624 else
55296809 625 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
ada70d94
TM		 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);
55296809 635 NFS_I(inode)->cache_validity &= ~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)
412d582e 742 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
1da177e4
LT		 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);
65e4308d 817 if (error == 0)
1da177e4 818 nfs_refresh_inode(inode, &fattr);
65e4308d
TM		 819 nfs_end_data_update(inode);
820 unlock_kernel();
821 return error;
822}
823
824/**
825 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
826 * @inode: pointer to struct inode
827 * @attr: pointer to struct iattr
828 *
829 * Note: we do this in the *proc.c in order to ensure that
830 * it works for things like exclusive creates too.
831 */
832void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
833{
834 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
1da177e4 835 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 836 int mode = attr->ia_mode & S_IALLUGO;
837 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 838 inode->i_mode = mode;
839 }
840 if ((attr->ia_valid & ATTR_UID) != 0)
841 inode->i_uid = attr->ia_uid;
842 if ((attr->ia_valid & ATTR_GID) != 0)
843 inode->i_gid = attr->ia_gid;
55296809 844 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
65e4308d
TM		 845 }
846 if ((attr->ia_valid & ATTR_SIZE) != 0) {
847 inode->i_size = attr->ia_size;
848 vmtruncate(inode, attr->ia_size);
849 }
1da177e4
LT		 850}
851
412d582e
CL		 852static int nfs_wait_schedule(void *word)
853{
854 if (signal_pending(current))
855 return -ERESTARTSYS;
856 schedule();
857 return 0;
858}
859
1da177e4
LT		 860/*
861 * Wait for the inode to get unlocked.
1da177e4 862 */
412d582e 863static int nfs_wait_on_inode(struct inode *inode)
1da177e4
LT		 864{
865 struct rpc_clnt *clnt = NFS_CLIENT(inode);
866 struct nfs_inode *nfsi = NFS_I(inode);
412d582e 867 sigset_t oldmask;
1da177e4 868 int error;
412d582e 869
1da177e4 870 atomic_inc(&inode->i_count);
412d582e
CL		 871 rpc_clnt_sigmask(clnt, &oldmask);
872 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
873 nfs_wait_schedule, TASK_INTERRUPTIBLE);
874 rpc_clnt_sigunmask(clnt, &oldmask);
1da177e4 875 iput(inode);
412d582e 876
1da177e4
LT		 877 return error;
878}
879
412d582e
CL		 880static void nfs_wake_up_inode(struct inode *inode)
881{
882 struct nfs_inode *nfsi = NFS_I(inode);
883
884 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
885 smp_mb__after_clear_bit();
886 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
887}
888
1da177e4
LT		 889int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
890{
891 struct inode *inode = dentry->d_inode;
55296809 892 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
1da177e4
LT		 893 int err;
894
895 if (__IS_FLG(inode, MS_NOATIME))
896 need_atime = 0;
897 else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
898 need_atime = 0;
899 /* We may force a getattr if the user cares about atime */
900 if (need_atime)
901 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
902 else
903 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
904 if (!err)
905 generic_fillattr(inode, stat);
906 return err;
907}
908
909struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
910{
911 struct nfs_open_context *ctx;
912
913 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
914 if (ctx != NULL) {
915 atomic_set(&ctx->count, 1);
916 ctx->dentry = dget(dentry);
917 ctx->cred = get_rpccred(cred);
918 ctx->state = NULL;
919 ctx->lockowner = current->files;
920 ctx->error = 0;
00a92642 921 ctx->dir_cookie = 0;
1da177e4
LT		 922 }
923 return ctx;
924}
925
926struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
927{
928 if (ctx != NULL)
929 atomic_inc(&ctx->count);
930 return ctx;
931}
932
933void put_nfs_open_context(struct nfs_open_context *ctx)
934{
935 if (atomic_dec_and_test(&ctx->count)) {
936 if (!list_empty(&ctx->list)) {
937 struct inode *inode = ctx->dentry->d_inode;
938 spin_lock(&inode->i_lock);
939 list_del(&ctx->list);
940 spin_unlock(&inode->i_lock);
941 }
942 if (ctx->state != NULL)
943 nfs4_close_state(ctx->state, ctx->mode);
944 if (ctx->cred != NULL)
945 put_rpccred(ctx->cred);
946 dput(ctx->dentry);
947 kfree(ctx);
948 }
949}
950
951/*
952 * Ensure that mmap has a recent RPC credential for use when writing out
953 * shared pages
954 */
955void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
956{
957 struct inode *inode = filp->f_dentry->d_inode;
958 struct nfs_inode *nfsi = NFS_I(inode);
959
960 filp->private_data = get_nfs_open_context(ctx);
961 spin_lock(&inode->i_lock);
962 list_add(&ctx->list, &nfsi->open_files);
963 spin_unlock(&inode->i_lock);
964}
965
966struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode)
967{
968 struct nfs_inode *nfsi = NFS_I(inode);
969 struct nfs_open_context *pos, *ctx = NULL;
970
971 spin_lock(&inode->i_lock);
972 list_for_each_entry(pos, &nfsi->open_files, list) {
973 if ((pos->mode & mode) == mode) {
974 ctx = get_nfs_open_context(pos);
975 break;
976 }
977 }
978 spin_unlock(&inode->i_lock);
979 return ctx;
980}
981
982void nfs_file_clear_open_context(struct file *filp)
983{
984 struct inode *inode = filp->f_dentry->d_inode;
985 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
986
987 if (ctx) {
988 filp->private_data = NULL;
989 spin_lock(&inode->i_lock);
990 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
991 spin_unlock(&inode->i_lock);
992 put_nfs_open_context(ctx);
993 }
994}
995
996/*
997 * These allocate and release file read/write context information.
998 */
999int nfs_open(struct inode *inode, struct file *filp)
1000{
1001 struct nfs_open_context *ctx;
1002 struct rpc_cred *cred;
1003
1004 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1005 if (IS_ERR(cred))
1006 return PTR_ERR(cred);
1007 ctx = alloc_nfs_open_context(filp->f_dentry, cred);
1008 put_rpccred(cred);
1009 if (ctx == NULL)
1010 return -ENOMEM;
1011 ctx->mode = filp->f_mode;
1012 nfs_file_set_open_context(filp, ctx);
1013 put_nfs_open_context(ctx);
1014 if ((filp->f_mode & FMODE_WRITE) != 0)
1015 nfs_begin_data_update(inode);
1016 return 0;
1017}
1018
1019int nfs_release(struct inode *inode, struct file *filp)
1020{
1021 if ((filp->f_mode & FMODE_WRITE) != 0)
1022 nfs_end_data_update(inode);
1023 nfs_file_clear_open_context(filp);
1024 return 0;
1025}
1026
1027/*
1028 * This function is called whenever some part of NFS notices that
1029 * the cached attributes have to be refreshed.
1030 */
1031int
1032__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1033{
1034 int status = -ESTALE;
1035 struct nfs_fattr fattr;
1036 struct nfs_inode *nfsi = NFS_I(inode);
1037 unsigned long verifier;
55296809 1038 unsigned long cache_validity;
1da177e4
LT		 1039
1040 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1041 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1042
1043 lock_kernel();
1044 if (!inode || is_bad_inode(inode))
1045 goto out_nowait;
1046 if (NFS_STALE(inode))
1047 goto out_nowait;
1048
412d582e
CL		 1049 status = nfs_wait_on_inode(inode);
1050 if (status < 0)
1051 goto out;
1052 if (NFS_STALE(inode)) {
1053 status = -ESTALE;
1054 /* Do we trust the cached ESTALE? */
1055 if (NFS_ATTRTIMEO(inode) != 0) {
1056 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
1057 /* no */
1058 } else
1059 goto out;
1060 }
1da177e4 1061 }
1da177e4
LT		 1062
1063 /* Protect against RPC races by saving the change attribute */
1064 verifier = nfs_save_change_attribute(inode);
1065 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1066 if (status != 0) {
1067 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1068 inode->i_sb->s_id,
1069 (long long)NFS_FILEID(inode), status);
1070 if (status == -ESTALE) {
1071 nfs_zap_caches(inode);
1072 if (!S_ISDIR(inode->i_mode))
412d582e 1073 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1da177e4
LT		 1074 }
1075 goto out;
1076 }
1077
1078 status = nfs_update_inode(inode, &fattr, verifier);
1079 if (status) {
1080 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1081 inode->i_sb->s_id,
1082 (long long)NFS_FILEID(inode), status);
1083 goto out;
1084 }
55296809
CL		 1085 cache_validity = nfsi->cache_validity;
1086 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1087
1da177e4
LT		 1088 /*
1089 * We may need to keep the attributes marked as invalid if
1090 * we raced with nfs_end_attr_update().
1091 */
1092 if (verifier == nfsi->cache_change_attribute)
55296809
CL		 1093 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1094
7d52e862 1095 nfs_revalidate_mapping(inode, inode->i_mapping);
55296809
CL		 1096
1097 if (cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1098 nfs_zap_acl_cache(inode);
55296809 1099
1da177e4
LT		 1100 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1101 inode->i_sb->s_id,
1102 (long long)NFS_FILEID(inode));
1103
412d582e
CL		 1104 out:
1105 nfs_wake_up_inode(inode);
1106
1da177e4
LT		 1107 out_nowait:
1108 unlock_kernel();
1109 return status;
1110}
1111
1112int nfs_attribute_timeout(struct inode *inode)
1113{
1114 struct nfs_inode *nfsi = NFS_I(inode);
1115
1116 if (nfs_have_delegation(inode, FMODE_READ))
1117 return 0;
1118 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1119}
1120
1121/**
1122 * nfs_revalidate_inode - Revalidate the inode attributes
1123 * @server - pointer to nfs_server struct
1124 * @inode - pointer to inode struct
1125 *
1126 * Updates inode attribute information by retrieving the data from the server.
1127 */
1128int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1129{
55296809 1130 if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1da177e4
LT		 1131 && !nfs_attribute_timeout(inode))
1132 return NFS_STALE(inode) ? -ESTALE : 0;
1133 return __nfs_revalidate_inode(server, inode);
1134}
1135
7d52e862
TM		 1136/**
1137 * nfs_revalidate_mapping - Revalidate the pagecache
1138 * @inode - pointer to host inode
1139 * @mapping - pointer to mapping
1140 */
1141void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1142{
1143 struct nfs_inode *nfsi = NFS_I(inode);
1144
55296809 1145 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
7d52e862
TM		 1146 if (S_ISREG(inode->i_mode)) {
1147 if (filemap_fdatawrite(mapping) == 0)
1148 filemap_fdatawait(mapping);
1149 nfs_wb_all(inode);
1150 }
1151 invalidate_inode_pages2(mapping);
55296809 1152 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
7d52e862
TM		 1153 if (S_ISDIR(inode->i_mode)) {
1154 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1155 /* This ensures we revalidate child dentries */
1156 nfsi->cache_change_attribute++;
1157 }
1158 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1159 inode->i_sb->s_id,
1160 (long long)NFS_FILEID(inode));
1161 }
1162}
1163
1da177e4
LT		 1164/**
1165 * nfs_begin_data_update
1166 * @inode - pointer to inode
1167 * Declare that a set of operations will update file data on the server
1168 */
1169void nfs_begin_data_update(struct inode *inode)
1170{
1171 atomic_inc(&NFS_I(inode)->data_updates);
1172}
1173
1174/**
1175 * nfs_end_data_update
1176 * @inode - pointer to inode
1177 * Declare end of the operations that will update file data
1178 * This will mark the inode as immediately needing revalidation
1179 * of its attribute cache.
1180 */
1181void nfs_end_data_update(struct inode *inode)
1182{
1183 struct nfs_inode *nfsi = NFS_I(inode);
1184
1185 if (!nfs_have_delegation(inode, FMODE_READ)) {
1186 /* Mark the attribute cache for revalidation */
55296809 1187 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1da177e4
LT		 1188 /* Directories and symlinks: invalidate page cache too */
1189 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
55296809 1190 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1da177e4
LT		 1191 }
1192 nfsi->cache_change_attribute ++;
1193 atomic_dec(&nfsi->data_updates);
1194}
1195
1da177e4
LT		 1196/**
1197 * nfs_refresh_inode - verify consistency of the inode attribute cache
1198 * @inode - pointer to inode
1199 * @fattr - updated attributes
1200 *
1201 * Verifies the attribute cache. If we have just changed the attributes,
1202 * so that fattr carries weak cache consistency data, then it may
1203 * also update the ctime/mtime/change_attribute.
1204 */
1205int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1206{
1207 struct nfs_inode *nfsi = NFS_I(inode);
1208 loff_t cur_size, new_isize;
1209 int data_unstable;
1210
1211 /* Do we hold a delegation? */
1212 if (nfs_have_delegation(inode, FMODE_READ))
1213 return 0;
1214
1215 /* Are we in the process of updating data on the server? */
1216 data_unstable = nfs_caches_unstable(inode);
1217
1218 if (fattr->valid & NFS_ATTR_FATTR_V4) {
1219 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1220 && nfsi->change_attr == fattr->pre_change_attr)
1221 nfsi->change_attr = fattr->change_attr;
fe51beec 1222 if (nfsi->change_attr != fattr->change_attr) {
55296809 1223 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
fe51beec 1224 if (!data_unstable)
55296809 1225 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
fe51beec 1226 }
1da177e4
LT		 1227 }
1228
1229 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1230 return 0;
1231
1232 /* Has the inode gone and changed behind our back? */
1233 if (nfsi->fileid != fattr->fileid
1234 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1235 return -EIO;
1236
1237 cur_size = i_size_read(inode);
1238 new_isize = nfs_size_to_loff_t(fattr->size);
1239
1240 /* If we have atomic WCC data, we may update some attributes */
1241 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1242 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
1243 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1244 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
1245 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1246 }
1247
1248 /* Verify a few of the more important attributes */
fe51beec 1249 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
55296809 1250 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
fe51beec 1251 if (!data_unstable)
55296809 1252 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
fe51beec
TM		 1253 }
1254 if (cur_size != new_isize) {
55296809 1255 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
fe51beec 1256 if (nfsi->npages == 0)
55296809 1257 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
fe51beec 1258 }
1da177e4
LT		 1259
1260 /* Have any file permissions changed? */
1261 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1262 || inode->i_uid != fattr->uid
1263 || inode->i_gid != fattr->gid)
55296809 1264 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1da177e4
LT		 1265
1266 /* Has the link count changed? */
1267 if (inode->i_nlink != fattr->nlink)
55296809 1268 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1da177e4
LT		 1269
1270 if (!timespec_equal(&inode->i_atime, &fattr->atime))
55296809 1271 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
1da177e4
LT		 1272
1273 nfsi->read_cache_jiffies = fattr->timestamp;
1274 return 0;
1275}
1276
1277/*
1278 * Many nfs protocol calls return the new file attributes after
1279 * an operation. Here we update the inode to reflect the state
1280 * of the server's inode.
1281 *
1282 * This is a bit tricky because we have to make sure all dirty pages
1283 * have been sent off to the server before calling invalidate_inode_pages.
1284 * To make sure no other process adds more write requests while we try
1285 * our best to flush them, we make them sleep during the attribute refresh.
1286 *
1287 * A very similar scenario holds for the dir cache.
1288 */
1289static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
1290{
1291 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1292 loff_t cur_isize, new_isize;
1da177e4 1293 unsigned int invalid = 0;
1da177e4
LT		 1294 int data_unstable;
1295
1296 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1297 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1298 atomic_read(&inode->i_count), fattr->valid);
1299
1300 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1301 return 0;
1302
1303 if (nfsi->fileid != fattr->fileid) {
1304 printk(KERN_ERR "%s: inode number mismatch\n"
1305 "expected (%s/0x%Lx), got (%s/0x%Lx)\n",
1306 __FUNCTION__,
1307 inode->i_sb->s_id, (long long)nfsi->fileid,
1308 inode->i_sb->s_id, (long long)fattr->fileid);
1309 goto out_err;
1310 }
1311
1312 /*
1313 * Make sure the inode's type hasn't changed.
1314 */
1315 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1316 goto out_changed;
1317
1318 /*
1319 * Update the read time so we don't revalidate too often.
1320 */
1321 nfsi->read_cache_jiffies = fattr->timestamp;
1322
1323 /* Are we racing with known updates of the metadata on the server? */
1324 data_unstable = ! nfs_verify_change_attribute(inode, verifier);
1325
951a143b 1326 /* Check if our cached file size is stale */
1da177e4
LT		 1327 new_isize = nfs_size_to_loff_t(fattr->size);
1328 cur_isize = i_size_read(inode);
951a143b
TM		 1329 if (new_isize != cur_isize) {
1330 /* Do we perhaps have any outstanding writes? */
1331 if (nfsi->npages == 0) {
1332 /* No, but did we race with nfs_end_data_update()? */
1333 if (verifier == nfsi->cache_change_attribute) {
1da177e4 1334 inode->i_size = new_isize;
951a143b 1335 invalid |= NFS_INO_INVALID_DATA;
1da177e4 1336 }
951a143b
TM		 1337 invalid |= NFS_INO_INVALID_ATTR;
1338 } else if (new_isize > cur_isize) {
1da177e4
LT		 1339 inode->i_size = new_isize;
1340 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1341 }
951a143b
TM		 1342 dprintk("NFS: isize change on server for file %s/%ld\n",
1343 inode->i_sb->s_id, inode->i_ino);
1da177e4
LT		 1344 }
1345
951a143b 1346 /* Check if the mtime agrees */
1da177e4
LT		 1347 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1348 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
951a143b
TM		 1349 dprintk("NFS: mtime change on server for file %s/%ld\n",
1350 inode->i_sb->s_id, inode->i_ino);
1da177e4
LT		 1351 if (!data_unstable)
1352 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1353 }
1354
1355 if ((fattr->valid & NFS_ATTR_FATTR_V4)
1356 && nfsi->change_attr != fattr->change_attr) {
951a143b 1357 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1da177e4 1358 inode->i_sb->s_id, inode->i_ino);
1da177e4
LT		 1359 nfsi->change_attr = fattr->change_attr;
1360 if (!data_unstable)
ada70d94 1361 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1da177e4
LT		 1362 }
1363
ada70d94
TM		 1364 /* If ctime has changed we should definitely clear access+acl caches */
1365 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1366 if (!data_unstable)
1367 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1368 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1369 }
1da177e4
LT		 1370 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1371
1372 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1373 inode->i_uid != fattr->uid ||
1374 inode->i_gid != fattr->gid)
ada70d94 1375 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1da177e4
LT		 1376
1377 inode->i_mode = fattr->mode;
1378 inode->i_nlink = fattr->nlink;
1379 inode->i_uid = fattr->uid;
1380 inode->i_gid = fattr->gid;
1381
1382 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1383 /*
1384 * report the blocks in 512byte units
1385 */
1386 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1387 inode->i_blksize = inode->i_sb->s_blocksize;
1388 } else {
1389 inode->i_blocks = fattr->du.nfs2.blocks;
1390 inode->i_blksize = fattr->du.nfs2.blocksize;
1391 }
1392
1393 /* Update attrtimeo value if we're out of the unstable period */
1394 if (invalid & NFS_INO_INVALID_ATTR) {
1395 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1396 nfsi->attrtimeo_timestamp = jiffies;
1397 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1398 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1399 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1400 nfsi->attrtimeo_timestamp = jiffies;
1401 }
1402 /* Don't invalidate the data if we were to blame */
1403 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1404 || S_ISLNK(inode->i_mode)))
1405 invalid &= ~NFS_INO_INVALID_DATA;
1406 if (!nfs_have_delegation(inode, FMODE_READ))
55296809 1407 nfsi->cache_validity |= invalid;
1da177e4
LT		 1408
1409 return 0;
1410 out_changed:
1411 /*
1412 * Big trouble! The inode has become a different object.
1413 */
1414#ifdef NFS_PARANOIA
1415 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1416 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1417#endif
1418 /*
1419 * No need to worry about unhashing the dentry, as the
1420 * lookup validation will know that the inode is bad.
1421 * (But we fall through to invalidate the caches.)
1422 */
1423 nfs_invalidate_inode(inode);
1424 out_err:
412d582e 1425 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1da177e4
LT		 1426 return -ESTALE;
1427}
1428
1429/*
1430 * File system information
1431 */
1432
1433static int nfs_set_super(struct super_block *s, void *data)
1434{
1435 s->s_fs_info = data;
1436 return set_anon_super(s, data);
1437}
1438
1439static int nfs_compare_super(struct super_block *sb, void *data)
1440{
1441 struct nfs_server *server = data;
1442 struct nfs_server *old = NFS_SB(sb);
1443
1444 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1445 return 0;
1446 if (old->addr.sin_port != server->addr.sin_port)
1447 return 0;
1448 return !nfs_compare_fh(&old->fh, &server->fh);
1449}
1450
1451static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1452 int flags, const char *dev_name, void *raw_data)
1453{
1454 int error;
9085bbcb 1455 struct nfs_server *server = NULL;
1da177e4
LT		 1456 struct super_block *s;
1457 struct nfs_fh *root;
1458 struct nfs_mount_data *data = raw_data;
1459
9085bbcb
TM		 1460 s = ERR_PTR(-EINVAL);
1461 if (data == NULL) {
1462 dprintk("%s: missing data argument\n", __FUNCTION__);
1463 goto out_err;
1464 }
1465 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1466 dprintk("%s: bad mount version\n", __FUNCTION__);
1467 goto out_err;
1da177e4 1468 }
9085bbcb
TM		 1469 switch (data->version) {
1470 case 1:
1471 data->namlen = 0;
1472 case 2:
1473 data->bsize = 0;
1474 case 3:
1475 if (data->flags & NFS_MOUNT_VER3) {
1476 dprintk("%s: mount structure version %d does not support NFSv3\n",
1477 __FUNCTION__,
1478 data->version);
1479 goto out_err;
1480 }
1481 data->root.size = NFS2_FHSIZE;
1482 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1483 case 4:
1484 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1485 dprintk("%s: mount structure version %d does not support strong security\n",
1486 __FUNCTION__,
1487 data->version);
1488 goto out_err;
1489 }
1490 case 5:
1491 memset(data->context, 0, sizeof(data->context));
1492 }
1493#ifndef CONFIG_NFS_V3
1494 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1495 s = ERR_PTR(-EPROTONOSUPPORT);
1496 if (data->flags & NFS_MOUNT_VER3) {
1497 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1498 goto out_err;
1499 }
1500#endif /* CONFIG_NFS_V3 */
1da177e4 1501
9085bbcb 1502 s = ERR_PTR(-ENOMEM);
1da177e4
LT		 1503 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1504 if (!server)
9085bbcb 1505 goto out_err;
1da177e4
LT		 1506 memset(server, 0, sizeof(struct nfs_server));
1507 /* Zero out the NFS state stuff */
1508 init_nfsv4_state(server);
b7fa0554 1509 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1da177e4 1510
1da177e4
LT		 1511 root = &server->fh;
1512 if (data->flags & NFS_MOUNT_VER3)
1513 root->size = data->root.size;
1514 else
1515 root->size = NFS2_FHSIZE;
9085bbcb 1516 s = ERR_PTR(-EINVAL);
1da177e4 1517 if (root->size > sizeof(root->data)) {
9085bbcb
TM		 1518 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1519 goto out_err;
1da177e4
LT		 1520 }
1521 memcpy(root->data, data->root.data, root->size);
1522
1523 /* We now require that the mount process passes the remote address */
1524 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1525 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
9085bbcb
TM		 1526 dprintk("%s: mount program didn't pass remote address!\n",
1527 __FUNCTION__);
1528 goto out_err;
1da177e4
LT		 1529 }
1530
9085bbcb
TM		 1531 /* Fire up rpciod if not yet running */
1532 s = ERR_PTR(rpciod_up());
1533 if (IS_ERR(s)) {
1534 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1535 __FUNCTION__, PTR_ERR(s));
1536 goto out_err;
1da177e4
LT		 1537 }
1538
9085bbcb
TM		 1539 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1540 if (IS_ERR(s) || s->s_root)
1541 goto out_rpciod_down;
1da177e4 1542
9085bbcb 1543 s->s_flags = flags;
1da177e4
LT		 1544
1545 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1546 if (error) {
1547 up_write(&s->s_umount);
1548 deactivate_super(s);
1549 return ERR_PTR(error);
1550 }
1551 s->s_flags |= MS_ACTIVE;
1552 return s;
9085bbcb
TM		 1553out_rpciod_down:
1554 rpciod_down();
1555out_err:
1556 kfree(server);
1557 return s;
1da177e4
LT		 1558}
1559
1560static void nfs_kill_super(struct super_block *s)
1561{
1562 struct nfs_server *server = NFS_SB(s);
1563
1564 kill_anon_super(s);
1565
6a19275a 1566 if (!IS_ERR(server->client))
1da177e4 1567 rpc_shutdown_client(server->client);
6a19275a 1568 if (!IS_ERR(server->client_sys))
1da177e4 1569 rpc_shutdown_client(server->client_sys);
b7fa0554
AG		 1570 if (!IS_ERR(server->client_acl))
1571 rpc_shutdown_client(server->client_acl);
1da177e4
LT		 1572
1573 if (!(server->flags & NFS_MOUNT_NONLM))
1574 lockd_down(); /* release rpc.lockd */
1575
1576 rpciod_down(); /* release rpciod */
1577
1578 if (server->hostname != NULL)
1579 kfree(server->hostname);
1580 kfree(server);
1581}
1582
1583static struct file_system_type nfs_fs_type = {
1584 .owner = THIS_MODULE,
1585 .name = "nfs",
1586 .get_sb = nfs_get_sb,
1587 .kill_sb = nfs_kill_super,
1588 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1589};
1590
1591#ifdef CONFIG_NFS_V4
1592
1593static void nfs4_clear_inode(struct inode *);
1594
1595
1596static struct super_operations nfs4_sops = {
1597 .alloc_inode = nfs_alloc_inode,
1598 .destroy_inode = nfs_destroy_inode,
1599 .write_inode = nfs_write_inode,
1600 .delete_inode = nfs_delete_inode,
1601 .statfs = nfs_statfs,
1602 .clear_inode = nfs4_clear_inode,
1603 .umount_begin = nfs_umount_begin,
1604 .show_options = nfs_show_options,
1605};
1606
1607/*
1608 * Clean out any remaining NFSv4 state that might be left over due
1609 * to open() calls that passed nfs_atomic_lookup, but failed to call
1610 * nfs_open().
1611 */
1612static void nfs4_clear_inode(struct inode *inode)
1613{
1614 struct nfs_inode *nfsi = NFS_I(inode);
1615
1616 /* If we are holding a delegation, return it! */
1617 if (nfsi->delegation != NULL)
1618 nfs_inode_return_delegation(inode);
1619 /* First call standard NFS clear_inode() code */
1620 nfs_clear_inode(inode);
1621 /* Now clear out any remaining state */
1622 while (!list_empty(&nfsi->open_states)) {
1623 struct nfs4_state *state;
1624
1625 state = list_entry(nfsi->open_states.next,
1626 struct nfs4_state,
1627 inode_states);
1628 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1629 __FUNCTION__,
1630 inode->i_sb->s_id,
1631 (long long)NFS_FILEID(inode),
1632 state);
1633 BUG_ON(atomic_read(&state->count) != 1);
1634 nfs4_close_state(state, state->state);
1635 }
1636}
1637
1638
1639static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1640{
1641 struct nfs_server *server;
1642 struct nfs4_client *clp = NULL;
1643 struct rpc_xprt *xprt = NULL;
1644 struct rpc_clnt *clnt = NULL;
1645 struct rpc_timeout timeparms;
1646 rpc_authflavor_t authflavour;
1647 int proto, err = -EIO;
1648
1649 sb->s_blocksize_bits = 0;
1650 sb->s_blocksize = 0;
1651 server = NFS_SB(sb);
1652 if (data->rsize != 0)
1653 server->rsize = nfs_block_size(data->rsize, NULL);
1654 if (data->wsize != 0)
1655 server->wsize = nfs_block_size(data->wsize, NULL);
1656 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1657 server->caps = NFS_CAP_ATOMIC_OPEN;
1658
1659 server->acregmin = data->acregmin*HZ;
1660 server->acregmax = data->acregmax*HZ;
1661 server->acdirmin = data->acdirmin*HZ;
1662 server->acdirmax = data->acdirmax*HZ;
1663
1664 server->rpc_ops = &nfs_v4_clientops;
1665 /* Initialize timeout values */
1666
1667 timeparms.to_initval = data->timeo * HZ / 10;
1668 timeparms.to_retries = data->retrans;
1669 timeparms.to_exponential = 1;
1670 if (!timeparms.to_retries)
1671 timeparms.to_retries = 5;
1672
1673 proto = data->proto;
1674 /* Which IP protocol do we use? */
1675 switch (proto) {
1676 case IPPROTO_TCP:
1677 timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT;
1678 if (!timeparms.to_initval)
1679 timeparms.to_initval = 600 * HZ / 10;
1680 break;
1681 case IPPROTO_UDP:
1682 timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT;
1683 if (!timeparms.to_initval)
1684 timeparms.to_initval = 11 * HZ / 10;
1685 break;
1686 default:
1687 return -EINVAL;
1688 }
1689
1690 clp = nfs4_get_client(&server->addr.sin_addr);
1691 if (!clp) {
9085bbcb 1692 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1da177e4
LT		 1693 return -EIO;
1694 }
1695
1696 /* Now create transport and client */
1697 authflavour = RPC_AUTH_UNIX;
1698 if (data->auth_flavourlen != 0) {
9085bbcb
TM		 1699 if (data->auth_flavourlen != 1) {
1700 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1701 __FUNCTION__, data->auth_flavourlen);
1702 err = -EINVAL;
1703 goto out_fail;
1704 }
1da177e4
LT		 1705 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1706 err = -EFAULT;
1707 goto out_fail;
1708 }
1709 }
1710
1711 down_write(&clp->cl_sem);
6a19275a 1712 if (IS_ERR(clp->cl_rpcclient)) {
1da177e4
LT		 1713 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
1714 if (IS_ERR(xprt)) {
1715 up_write(&clp->cl_sem);
1da177e4 1716 err = PTR_ERR(xprt);
9085bbcb
TM		 1717 dprintk("%s: cannot create RPC transport. Error = %d\n",
1718 __FUNCTION__, err);
1da177e4
LT		 1719 goto out_fail;
1720 }
1721 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1722 server->rpc_ops->version, authflavour);
1723 if (IS_ERR(clnt)) {
1724 up_write(&clp->cl_sem);
1da177e4 1725 err = PTR_ERR(clnt);
9085bbcb
TM		 1726 dprintk("%s: cannot create RPC client. Error = %d\n",
1727 __FUNCTION__, err);
1da177e4
LT		 1728 goto out_fail;
1729 }
1730 clnt->cl_intr = 1;
1731 clnt->cl_softrtry = 1;
1732 clnt->cl_chatty = 1;
1733 clp->cl_rpcclient = clnt;
1734 clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
1735 if (IS_ERR(clp->cl_cred)) {
1736 up_write(&clp->cl_sem);
1737 err = PTR_ERR(clp->cl_cred);
1738 clp->cl_cred = NULL;
1739 goto out_fail;
1740 }
1741 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1742 nfs_idmap_new(clp);
1743 }
1744 if (list_empty(&clp->cl_superblocks)) {
1745 err = nfs4_init_client(clp);
1746 if (err != 0) {
1747 up_write(&clp->cl_sem);
1748 goto out_fail;
1749 }
1750 }
1751 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1752 clnt = rpc_clone_client(clp->cl_rpcclient);
1753 if (!IS_ERR(clnt))
1754 server->nfs4_state = clp;
1755 up_write(&clp->cl_sem);
1756 clp = NULL;
1757
1758 if (IS_ERR(clnt)) {
9085bbcb
TM		 1759 err = PTR_ERR(clnt);
1760 dprintk("%s: cannot create RPC client. Error = %d\n",
1761 __FUNCTION__, err);
1762 return err;
1da177e4
LT		 1763 }
1764
1765 server->client = clnt;
1766
1767 if (server->nfs4_state->cl_idmap == NULL) {
9085bbcb 1768 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1da177e4
LT		 1769 return -ENOMEM;
1770 }
1771
1772 if (clnt->cl_auth->au_flavor != authflavour) {
6a19275a
BF		 1773 struct rpc_auth *auth;
1774
1775 auth = rpcauth_create(authflavour, clnt);
1776 if (IS_ERR(auth)) {
9085bbcb 1777 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
6a19275a 1778 return PTR_ERR(auth);
1da177e4
LT		 1779 }
1780 }
1781
1782 sb->s_time_gran = 1;
1783
1784 sb->s_op = &nfs4_sops;
1785 err = nfs_sb_init(sb, authflavour);
1786 if (err == 0)
1787 return 0;
1788out_fail:
1789 if (clp)
1790 nfs4_put_client(clp);
1791 return err;
1792}
1793
1794static int nfs4_compare_super(struct super_block *sb, void *data)
1795{
1796 struct nfs_server *server = data;
1797 struct nfs_server *old = NFS_SB(sb);
1798
1799 if (strcmp(server->hostname, old->hostname) != 0)
1800 return 0;
1801 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1802 return 0;
1803 return 1;
1804}
1805
1806static void *
1807nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1808{
1809 void *p = NULL;
1810
1811 if (!src->len)
1812 return ERR_PTR(-EINVAL);
1813 if (src->len < maxlen)
1814 maxlen = src->len;
1815 if (dst == NULL) {
1816 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1817 if (p == NULL)
1818 return ERR_PTR(-ENOMEM);
1819 }
1820 if (copy_from_user(dst, src->data, maxlen)) {
1821 if (p != NULL)
1822 kfree(p);
1823 return ERR_PTR(-EFAULT);
1824 }
1825 dst[maxlen] = '\0';
1826 return dst;
1827}
1828
1829static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1830 int flags, const char *dev_name, void *raw_data)
1831{
1832 int error;
1833 struct nfs_server *server;
1834 struct super_block *s;
1835 struct nfs4_mount_data *data = raw_data;
1836 void *p;
1837
9085bbcb
TM		 1838 if (data == NULL) {
1839 dprintk("%s: missing data argument\n", __FUNCTION__);
1840 return ERR_PTR(-EINVAL);
1841 }
1842 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1843 dprintk("%s: bad mount version\n", __FUNCTION__);
1da177e4
LT		 1844 return ERR_PTR(-EINVAL);
1845 }
1846
1847 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1848 if (!server)
1849 return ERR_PTR(-ENOMEM);
1850 memset(server, 0, sizeof(struct nfs_server));
1851 /* Zero out the NFS state stuff */
1852 init_nfsv4_state(server);
b7fa0554 1853 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1da177e4 1854
1da177e4
LT		 1855 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1856 if (IS_ERR(p))
1857 goto out_err;
1858 server->hostname = p;
1859
1860 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1861 if (IS_ERR(p))
1862 goto out_err;
1863 server->mnt_path = p;
1864
1865 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1866 sizeof(server->ip_addr) - 1);
1867 if (IS_ERR(p))
1868 goto out_err;
1869
1870 /* We now require that the mount process passes the remote address */
1871 if (data->host_addrlen != sizeof(server->addr)) {
1872 s = ERR_PTR(-EINVAL);
1873 goto out_free;
1874 }
1875 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1876 s = ERR_PTR(-EFAULT);
1877 goto out_free;
1878 }
1879 if (server->addr.sin_family != AF_INET ||
1880 server->addr.sin_addr.s_addr == INADDR_ANY) {
9085bbcb
TM		 1881 dprintk("%s: mount program didn't pass remote IP address!\n",
1882 __FUNCTION__);
1da177e4
LT		 1883 s = ERR_PTR(-EINVAL);
1884 goto out_free;
1885 }
1886
9085bbcb
TM		 1887 /* Fire up rpciod if not yet running */
1888 s = ERR_PTR(rpciod_up());
1889 if (IS_ERR(s)) {
1890 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1891 __FUNCTION__, PTR_ERR(s));
1892 goto out_free;
1893 }
1894
1da177e4
LT		 1895 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1896
1897 if (IS_ERR(s) || s->s_root)
1898 goto out_free;
1899
1900 s->s_flags = flags;
1901
1da177e4
LT		 1902 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1903 if (error) {
1904 up_write(&s->s_umount);
1905 deactivate_super(s);
1906 return ERR_PTR(error);
1907 }
1908 s->s_flags |= MS_ACTIVE;
1909 return s;
1910out_err:
1911 s = (struct super_block *)p;
1912out_free:
1913 if (server->mnt_path)
1914 kfree(server->mnt_path);
1915 if (server->hostname)
1916 kfree(server->hostname);
1917 kfree(server);
1918 return s;
1919}
1920
1921static void nfs4_kill_super(struct super_block *sb)
1922{
1923 struct nfs_server *server = NFS_SB(sb);
1924
1925 nfs_return_all_delegations(sb);
1926 kill_anon_super(sb);
1927
1928 nfs4_renewd_prepare_shutdown(server);
1929
1930 if (server->client != NULL && !IS_ERR(server->client))
1931 rpc_shutdown_client(server->client);
1932 rpciod_down(); /* release rpciod */
1933
1934 destroy_nfsv4_state(server);
1935
1936 if (server->hostname != NULL)
1937 kfree(server->hostname);
1938 kfree(server);
1939}
1940
1941static struct file_system_type nfs4_fs_type = {
1942 .owner = THIS_MODULE,
1943 .name = "nfs4",
1944 .get_sb = nfs4_get_sb,
1945 .kill_sb = nfs4_kill_super,
1946 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1947};
1948
1949#define nfs4_init_once(nfsi) \
1950 do { \
1951 INIT_LIST_HEAD(&(nfsi)->open_states); \
1952 nfsi->delegation = NULL; \
1953 nfsi->delegation_state = 0; \
1954 init_rwsem(&nfsi->rwsem); \
1955 } while(0)
1956#define register_nfs4fs() register_filesystem(&nfs4_fs_type)
1957#define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
1958#else
1959#define nfs4_init_once(nfsi) \
1960 do { } while (0)
1961#define register_nfs4fs() (0)
1962#define unregister_nfs4fs()
1963#endif
1964
1965extern int nfs_init_nfspagecache(void);
1966extern void nfs_destroy_nfspagecache(void);
1967extern int nfs_init_readpagecache(void);
1968extern void nfs_destroy_readpagecache(void);
1969extern int nfs_init_writepagecache(void);
1970extern void nfs_destroy_writepagecache(void);
1971#ifdef CONFIG_NFS_DIRECTIO
1972extern int nfs_init_directcache(void);
1973extern void nfs_destroy_directcache(void);
1974#endif
1975
1976static kmem_cache_t * nfs_inode_cachep;
1977
1978static struct inode *nfs_alloc_inode(struct super_block *sb)
1979{
1980 struct nfs_inode *nfsi;
1981 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
1982 if (!nfsi)
1983 return NULL;
55296809
CL		 1984 nfsi->flags = 0UL;
1985 nfsi->cache_validity = 0UL;
458818ed
TM		 1986#ifdef CONFIG_NFS_V3_ACL
1987 nfsi->acl_access = ERR_PTR(-EAGAIN);
1988 nfsi->acl_default = ERR_PTR(-EAGAIN);
1989#endif
e50a1c2e
BF		 1990#ifdef CONFIG_NFS_V4
1991 nfsi->nfs4_acl = NULL;
1992#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 1993 return &nfsi->vfs_inode;
1994}
1995
1996static void nfs_destroy_inode(struct inode *inode)
1997{
1998 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1999}
2000
2001static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
2002{
2003 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2004
2005 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2006 SLAB_CTOR_CONSTRUCTOR) {
2007 inode_init_once(&nfsi->vfs_inode);
2008 spin_lock_init(&nfsi->req_lock);
2009 INIT_LIST_HEAD(&nfsi->dirty);
2010 INIT_LIST_HEAD(&nfsi->commit);
2011 INIT_LIST_HEAD(&nfsi->open_files);
2012 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
2013 atomic_set(&nfsi->data_updates, 0);
2014 nfsi->ndirty = 0;
2015 nfsi->ncommit = 0;
2016 nfsi->npages = 0;
1da177e4
LT		 2017 nfs4_init_once(nfsi);
2018 }
2019}
2020
75c96f85 2021static int nfs_init_inodecache(void)
1da177e4
LT		 2022{
2023 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2024 sizeof(struct nfs_inode),
2025 0, SLAB_RECLAIM_ACCOUNT,
2026 init_once, NULL);
2027 if (nfs_inode_cachep == NULL)
2028 return -ENOMEM;
2029
2030 return 0;
2031}
2032
75c96f85 2033static void nfs_destroy_inodecache(void)
1da177e4
LT		 2034{
2035 if (kmem_cache_destroy(nfs_inode_cachep))
2036 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
2037}
2038
2039/*
2040 * Initialize NFS
2041 */
2042static int __init init_nfs_fs(void)
2043{
2044 int err;
2045
2046 err = nfs_init_nfspagecache();
2047 if (err)
2048 goto out4;
2049
2050 err = nfs_init_inodecache();
2051 if (err)
2052 goto out3;
2053
2054 err = nfs_init_readpagecache();
2055 if (err)
2056 goto out2;
2057
2058 err = nfs_init_writepagecache();
2059 if (err)
2060 goto out1;
2061
2062#ifdef CONFIG_NFS_DIRECTIO
2063 err = nfs_init_directcache();
2064 if (err)
2065 goto out0;
2066#endif
2067
2068#ifdef CONFIG_PROC_FS
2069 rpc_proc_register(&nfs_rpcstat);
2070#endif
2071 err = register_filesystem(&nfs_fs_type);
2072 if (err)
2073 goto out;
2074 if ((err = register_nfs4fs()) != 0)
2075 goto out;
2076 return 0;
2077out:
2078#ifdef CONFIG_PROC_FS
2079 rpc_proc_unregister("nfs");
2080#endif
2081 nfs_destroy_writepagecache();
2082#ifdef CONFIG_NFS_DIRECTIO
2083out0:
2084 nfs_destroy_directcache();
2085#endif
2086out1:
2087 nfs_destroy_readpagecache();
2088out2:
2089 nfs_destroy_inodecache();
2090out3:
2091 nfs_destroy_nfspagecache();
2092out4:
2093 return err;
2094}
2095
2096static void __exit exit_nfs_fs(void)
2097{
2098#ifdef CONFIG_NFS_DIRECTIO
2099 nfs_destroy_directcache();
2100#endif
2101 nfs_destroy_writepagecache();
2102 nfs_destroy_readpagecache();
2103 nfs_destroy_inodecache();
2104 nfs_destroy_nfspagecache();
2105#ifdef CONFIG_PROC_FS
2106 rpc_proc_unregister("nfs");
2107#endif
2108 unregister_filesystem(&nfs_fs_type);
2109 unregister_nfs4fs();
2110}
2111
2112/* Not quite true; I just maintain it */
2113MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2114MODULE_LICENSE("GPL");
2115
2116module_init(init_nfs_fs)
2117module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)