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Linux-2.6.12-rc2
[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
42#include "delegation.h"
43
44#define NFSDBG_FACILITY NFSDBG_VFS
45#define NFS_PARANOIA 1
46
47/* Maximum number of readahead requests
48 * FIXME: this should really be a sysctl so that users may tune it to suit
49 * their needs. People that do NFS over a slow network, might for
50 * instance want to reduce it to something closer to 1 for improved
51 * interactive response.
52 */
53#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
54
55static void nfs_invalidate_inode(struct inode *);
56static int nfs_update_inode(struct inode *, struct nfs_fattr *, unsigned long);
57
58static struct inode *nfs_alloc_inode(struct super_block *sb);
59static void nfs_destroy_inode(struct inode *);
60static int nfs_write_inode(struct inode *,int);
61static void nfs_delete_inode(struct inode *);
62static void nfs_clear_inode(struct inode *);
63static void nfs_umount_begin(struct super_block *);
64static int nfs_statfs(struct super_block *, struct kstatfs *);
65static int nfs_show_options(struct seq_file *, struct vfsmount *);
66
67static struct rpc_program nfs_program;
68
69static struct super_operations nfs_sops = {
70 .alloc_inode = nfs_alloc_inode,
71 .destroy_inode = nfs_destroy_inode,
72 .write_inode = nfs_write_inode,
73 .delete_inode = nfs_delete_inode,
74 .statfs = nfs_statfs,
75 .clear_inode = nfs_clear_inode,
76 .umount_begin = nfs_umount_begin,
77 .show_options = nfs_show_options,
78};
79
80/*
81 * RPC cruft for NFS
82 */
83static struct rpc_stat nfs_rpcstat = {
84 .program = &nfs_program
85};
86static struct rpc_version * nfs_version[] = {
87 NULL,
88 NULL,
89 &nfs_version2,
90#if defined(CONFIG_NFS_V3)
91 &nfs_version3,
92#elif defined(CONFIG_NFS_V4)
93 NULL,
94#endif
95#if defined(CONFIG_NFS_V4)
96 &nfs_version4,
97#endif
98};
99
100static struct rpc_program nfs_program = {
101 .name = "nfs",
102 .number = NFS_PROGRAM,
103 .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
104 .version = nfs_version,
105 .stats = &nfs_rpcstat,
106 .pipe_dir_name = "/nfs",
107};
108
109static inline unsigned long
110nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
111{
112 return nfs_fileid_to_ino_t(fattr->fileid);
113}
114
115static int
116nfs_write_inode(struct inode *inode, int sync)
117{
118 int flags = sync ? FLUSH_WAIT : 0;
119 int ret;
120
121 ret = nfs_commit_inode(inode, 0, 0, flags);
122 if (ret < 0)
123 return ret;
124 return 0;
125}
126
127static void
128nfs_delete_inode(struct inode * inode)
129{
130 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
131
132 nfs_wb_all(inode);
133 /*
134 * The following should never happen...
135 */
136 if (nfs_have_writebacks(inode)) {
137 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
138 }
139
140 clear_inode(inode);
141}
142
143/*
144 * For the moment, the only task for the NFS clear_inode method is to
145 * release the mmap credential
146 */
147static void
148nfs_clear_inode(struct inode *inode)
149{
150 struct nfs_inode *nfsi = NFS_I(inode);
151 struct rpc_cred *cred;
152
153 nfs_wb_all(inode);
154 BUG_ON (!list_empty(&nfsi->open_files));
155 cred = nfsi->cache_access.cred;
156 if (cred)
157 put_rpccred(cred);
158 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
159}
160
161void
162nfs_umount_begin(struct super_block *sb)
163{
164 struct nfs_server *server = NFS_SB(sb);
165 struct rpc_clnt *rpc;
166
167 /* -EIO all pending I/O */
168 if ((rpc = server->client) != NULL)
169 rpc_killall_tasks(rpc);
170}
171
172
173static inline unsigned long
174nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
175{
176 /* make sure blocksize is a power of two */
177 if ((bsize & (bsize - 1)) || nrbitsp) {
178 unsigned char nrbits;
179
180 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
181 ;
182 bsize = 1 << nrbits;
183 if (nrbitsp)
184 *nrbitsp = nrbits;
185 }
186
187 return bsize;
188}
189
190/*
191 * Calculate the number of 512byte blocks used.
192 */
193static inline unsigned long
194nfs_calc_block_size(u64 tsize)
195{
196 loff_t used = (tsize + 511) >> 9;
197 return (used > ULONG_MAX) ? ULONG_MAX : used;
198}
199
200/*
201 * Compute and set NFS server blocksize
202 */
203static inline unsigned long
204nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
205{
206 if (bsize < 1024)
207 bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
208 else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
209 bsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
210
211 return nfs_block_bits(bsize, nrbitsp);
212}
213
214/*
215 * Obtain the root inode of the file system.
216 */
217static struct inode *
218nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
219{
220 struct nfs_server *server = NFS_SB(sb);
221 struct inode *rooti;
222 int error;
223
224 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
225 if (error < 0) {
226 dprintk("nfs_get_root: getattr error = %d\n", -error);
227 return ERR_PTR(error);
228 }
229
230 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
231 if (!rooti)
232 return ERR_PTR(-ENOMEM);
233 return rooti;
234}
235
236/*
237 * Do NFS version-independent mount processing, and sanity checking
238 */
239static int
240nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
241{
242 struct nfs_server *server;
243 struct inode *root_inode;
244 struct nfs_fattr fattr;
245 struct nfs_fsinfo fsinfo = {
246 .fattr = &fattr,
247 };
248 struct nfs_pathconf pathinfo = {
249 .fattr = &fattr,
250 };
251 int no_root_error = 0;
252 unsigned long max_rpc_payload;
253
254 /* We probably want something more informative here */
255 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
256
257 server = NFS_SB(sb);
258
259 sb->s_magic = NFS_SUPER_MAGIC;
260
261 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
262 /* Did getting the root inode fail? */
263 if (IS_ERR(root_inode)) {
264 no_root_error = PTR_ERR(root_inode);
265 goto out_no_root;
266 }
267 sb->s_root = d_alloc_root(root_inode);
268 if (!sb->s_root) {
269 no_root_error = -ENOMEM;
270 goto out_no_root;
271 }
272 sb->s_root->d_op = server->rpc_ops->dentry_ops;
273
274 /* Get some general file system info */
275 if (server->namelen == 0 &&
276 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
277 server->namelen = pathinfo.max_namelen;
278 /* Work out a lot of parameters */
279 if (server->rsize == 0)
280 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
281 if (server->wsize == 0)
282 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
283
284 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
285 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
286 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
287 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
288
289 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
290 if (server->rsize > max_rpc_payload)
291 server->rsize = max_rpc_payload;
292 if (server->wsize > max_rpc_payload)
293 server->wsize = max_rpc_payload;
294
295 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
296 if (server->rpages > NFS_READ_MAXIOV) {
297 server->rpages = NFS_READ_MAXIOV;
298 server->rsize = server->rpages << PAGE_CACHE_SHIFT;
299 }
300
301 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
302 if (server->wpages > NFS_WRITE_MAXIOV) {
303 server->wpages = NFS_WRITE_MAXIOV;
304 server->wsize = server->wpages << PAGE_CACHE_SHIFT;
305 }
306
307 if (sb->s_blocksize == 0)
308 sb->s_blocksize = nfs_block_bits(server->wsize,
309 &sb->s_blocksize_bits);
310 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
311
312 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
313 if (server->dtsize > PAGE_CACHE_SIZE)
314 server->dtsize = PAGE_CACHE_SIZE;
315 if (server->dtsize > server->rsize)
316 server->dtsize = server->rsize;
317
318 if (server->flags & NFS_MOUNT_NOAC) {
319 server->acregmin = server->acregmax = 0;
320 server->acdirmin = server->acdirmax = 0;
321 sb->s_flags |= MS_SYNCHRONOUS;
322 }
323 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
324
325 sb->s_maxbytes = fsinfo.maxfilesize;
326 if (sb->s_maxbytes > MAX_LFS_FILESIZE)
327 sb->s_maxbytes = MAX_LFS_FILESIZE;
328
329 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
330 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
331
332 /* We're airborne Set socket buffersize */
333 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
334 return 0;
335 /* Yargs. It didn't work out. */
336out_no_root:
337 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
338 if (!IS_ERR(root_inode))
339 iput(root_inode);
340 return no_root_error;
341}
342
343/*
344 * Create an RPC client handle.
345 */
346static struct rpc_clnt *
347nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
348{
349 struct rpc_timeout timeparms;
350 struct rpc_xprt *xprt = NULL;
351 struct rpc_clnt *clnt = NULL;
352 int tcp = (data->flags & NFS_MOUNT_TCP);
353
354 /* Initialize timeout values */
355 timeparms.to_initval = data->timeo * HZ / 10;
356 timeparms.to_retries = data->retrans;
357 timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT;
358 timeparms.to_exponential = 1;
359
360 if (!timeparms.to_initval)
361 timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10;
362 if (!timeparms.to_retries)
363 timeparms.to_retries = 5;
364
365 /* create transport and client */
366 xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP,
367 &server->addr, &timeparms);
368 if (IS_ERR(xprt)) {
369 printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
370 return (struct rpc_clnt *)xprt;
371 }
372 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
373 server->rpc_ops->version, data->pseudoflavor);
374 if (IS_ERR(clnt)) {
375 printk(KERN_WARNING "NFS: cannot create RPC client.\n");
376 goto out_fail;
377 }
378
379 clnt->cl_intr = 1;
380 clnt->cl_softrtry = 1;
381 clnt->cl_chatty = 1;
382
383 return clnt;
384
385out_fail:
386 xprt_destroy(xprt);
387 return clnt;
388}
389
390/*
391 * The way this works is that the mount process passes a structure
392 * in the data argument which contains the server's IP address
393 * and the root file handle obtained from the server's mount
394 * daemon. We stash these away in the private superblock fields.
395 */
396static int
397nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
398{
399 struct nfs_server *server;
400 rpc_authflavor_t authflavor;
401
402 server = NFS_SB(sb);
403 sb->s_blocksize_bits = 0;
404 sb->s_blocksize = 0;
405 if (data->bsize)
406 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
407 if (data->rsize)
408 server->rsize = nfs_block_size(data->rsize, NULL);
409 if (data->wsize)
410 server->wsize = nfs_block_size(data->wsize, NULL);
411 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
412
413 server->acregmin = data->acregmin*HZ;
414 server->acregmax = data->acregmax*HZ;
415 server->acdirmin = data->acdirmin*HZ;
416 server->acdirmax = data->acdirmax*HZ;
417
418 /* Start lockd here, before we might error out */
419 if (!(server->flags & NFS_MOUNT_NONLM))
420 lockd_up();
421
422 server->namelen = data->namlen;
423 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
424 if (!server->hostname)
425 return -ENOMEM;
426 strcpy(server->hostname, data->hostname);
427
428 /* Check NFS protocol revision and initialize RPC op vector
429 * and file handle pool. */
430 if (server->flags & NFS_MOUNT_VER3) {
431#ifdef CONFIG_NFS_V3
432 server->rpc_ops = &nfs_v3_clientops;
433 server->caps |= NFS_CAP_READDIRPLUS;
434 if (data->version < 4) {
435 printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n");
436 return -EIO;
437 }
438#else
439 printk(KERN_NOTICE "NFS: NFSv3 not supported.\n");
440 return -EIO;
441#endif
442 } else {
443 server->rpc_ops = &nfs_v2_clientops;
444 }
445
446 /* Fill in pseudoflavor for mount version < 5 */
447 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
448 data->pseudoflavor = RPC_AUTH_UNIX;
449 authflavor = data->pseudoflavor; /* save for sb_init() */
450 /* XXX maybe we want to add a server->pseudoflavor field */
451
452 /* Create RPC client handles */
453 server->client = nfs_create_client(server, data);
454 if (IS_ERR(server->client))
455 return PTR_ERR(server->client);
456 /* RFC 2623, sec 2.3.2 */
457 if (authflavor != RPC_AUTH_UNIX) {
458 server->client_sys = rpc_clone_client(server->client);
459 if (IS_ERR(server->client_sys))
460 return PTR_ERR(server->client_sys);
461 if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys))
462 return -ENOMEM;
463 } else {
464 atomic_inc(&server->client->cl_count);
465 server->client_sys = server->client;
466 }
467
468 if (server->flags & NFS_MOUNT_VER3) {
469 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
470 server->namelen = NFS3_MAXNAMLEN;
471 sb->s_time_gran = 1;
472 } else {
473 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
474 server->namelen = NFS2_MAXNAMLEN;
475 }
476
477 sb->s_op = &nfs_sops;
478 return nfs_sb_init(sb, authflavor);
479}
480
481static int
482nfs_statfs(struct super_block *sb, struct kstatfs *buf)
483{
484 struct nfs_server *server = NFS_SB(sb);
485 unsigned char blockbits;
486 unsigned long blockres;
487 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
488 struct nfs_fattr fattr;
489 struct nfs_fsstat res = {
490 .fattr = &fattr,
491 };
492 int error;
493
494 lock_kernel();
495
496 error = server->rpc_ops->statfs(server, rootfh, &res);
497 buf->f_type = NFS_SUPER_MAGIC;
498 if (error < 0)
499 goto out_err;
500
501 /*
502 * Current versions of glibc do not correctly handle the
503 * case where f_frsize != f_bsize. Eventually we want to
504 * report the value of wtmult in this field.
505 */
506 buf->f_frsize = sb->s_blocksize;
507
508 /*
509 * On most *nix systems, f_blocks, f_bfree, and f_bavail
510 * are reported in units of f_frsize. Linux hasn't had
511 * an f_frsize field in its statfs struct until recently,
512 * thus historically Linux's sys_statfs reports these
513 * fields in units of f_bsize.
514 */
515 buf->f_bsize = sb->s_blocksize;
516 blockbits = sb->s_blocksize_bits;
517 blockres = (1 << blockbits) - 1;
518 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
519 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
520 buf->f_bavail = (res.abytes + blockres) >> blockbits;
521
522 buf->f_files = res.tfiles;
523 buf->f_ffree = res.afiles;
524
525 buf->f_namelen = server->namelen;
526 out:
527 unlock_kernel();
528
529 return 0;
530
531 out_err:
532 printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error);
533 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
534 goto out;
535
536}
537
538static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
539{
540 static struct proc_nfs_info {
541 int flag;
542 char *str;
543 char *nostr;
544 } nfs_info[] = {
545 { NFS_MOUNT_SOFT, ",soft", ",hard" },
546 { NFS_MOUNT_INTR, ",intr", "" },
547 { NFS_MOUNT_POSIX, ",posix", "" },
548 { NFS_MOUNT_TCP, ",tcp", ",udp" },
549 { NFS_MOUNT_NOCTO, ",nocto", "" },
550 { NFS_MOUNT_NOAC, ",noac", "" },
551 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
552 { 0, NULL, NULL }
553 };
554 struct proc_nfs_info *nfs_infop;
555 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
556
557 seq_printf(m, ",v%d", nfss->rpc_ops->version);
558 seq_printf(m, ",rsize=%d", nfss->rsize);
559 seq_printf(m, ",wsize=%d", nfss->wsize);
560 if (nfss->acregmin != 3*HZ)
561 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
562 if (nfss->acregmax != 60*HZ)
563 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
564 if (nfss->acdirmin != 30*HZ)
565 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
566 if (nfss->acdirmax != 60*HZ)
567 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
568 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
569 if (nfss->flags & nfs_infop->flag)
570 seq_puts(m, nfs_infop->str);
571 else
572 seq_puts(m, nfs_infop->nostr);
573 }
574 seq_puts(m, ",addr=");
575 seq_escape(m, nfss->hostname, " \t\n\\");
576 return 0;
577}
578
579/*
580 * Invalidate the local caches
581 */
582void
583nfs_zap_caches(struct inode *inode)
584{
585 struct nfs_inode *nfsi = NFS_I(inode);
586 int mode = inode->i_mode;
587
588 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
589 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
590
591 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
592 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
593 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS;
594 else
595 nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
596}
597
598/*
599 * Invalidate, but do not unhash, the inode
600 */
601static void
602nfs_invalidate_inode(struct inode *inode)
603{
604 umode_t save_mode = inode->i_mode;
605
606 make_bad_inode(inode);
607 inode->i_mode = save_mode;
608 nfs_zap_caches(inode);
609}
610
611struct nfs_find_desc {
612 struct nfs_fh *fh;
613 struct nfs_fattr *fattr;
614};
615
616/*
617 * In NFSv3 we can have 64bit inode numbers. In order to support
618 * this, and re-exported directories (also seen in NFSv2)
619 * we are forced to allow 2 different inodes to have the same
620 * i_ino.
621 */
622static int
623nfs_find_actor(struct inode *inode, void *opaque)
624{
625 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
626 struct nfs_fh *fh = desc->fh;
627 struct nfs_fattr *fattr = desc->fattr;
628
629 if (NFS_FILEID(inode) != fattr->fileid)
630 return 0;
631 if (nfs_compare_fh(NFS_FH(inode), fh))
632 return 0;
633 if (is_bad_inode(inode) || NFS_STALE(inode))
634 return 0;
635 return 1;
636}
637
638static int
639nfs_init_locked(struct inode *inode, void *opaque)
640{
641 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
642 struct nfs_fattr *fattr = desc->fattr;
643
644 NFS_FILEID(inode) = fattr->fileid;
645 nfs_copy_fh(NFS_FH(inode), desc->fh);
646 return 0;
647}
648
649/* Don't use READDIRPLUS on directories that we believe are too large */
650#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
651
652/*
653 * This is our front-end to iget that looks up inodes by file handle
654 * instead of inode number.
655 */
656struct inode *
657nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
658{
659 struct nfs_find_desc desc = {
660 .fh = fh,
661 .fattr = fattr
662 };
663 struct inode *inode = NULL;
664 unsigned long hash;
665
666 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
667 goto out_no_inode;
668
669 if (!fattr->nlink) {
670 printk("NFS: Buggy server - nlink == 0!\n");
671 goto out_no_inode;
672 }
673
674 hash = nfs_fattr_to_ino_t(fattr);
675
676 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
677 goto out_no_inode;
678
679 if (inode->i_state & I_NEW) {
680 struct nfs_inode *nfsi = NFS_I(inode);
681
682 /* We set i_ino for the few things that still rely on it,
683 * such as stat(2) */
684 inode->i_ino = hash;
685
686 /* We can't support update_atime(), since the server will reset it */
687 inode->i_flags |= S_NOATIME|S_NOCMTIME;
688 inode->i_mode = fattr->mode;
689 /* Why so? Because we want revalidate for devices/FIFOs, and
690 * that's precisely what we have in nfs_file_inode_operations.
691 */
692 inode->i_op = &nfs_file_inode_operations;
693 if (S_ISREG(inode->i_mode)) {
694 inode->i_fop = &nfs_file_operations;
695 inode->i_data.a_ops = &nfs_file_aops;
696 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
697 } else if (S_ISDIR(inode->i_mode)) {
698 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
699 inode->i_fop = &nfs_dir_operations;
700 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
701 && fattr->size <= NFS_LIMIT_READDIRPLUS)
702 NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS;
703 } else if (S_ISLNK(inode->i_mode))
704 inode->i_op = &nfs_symlink_inode_operations;
705 else
706 init_special_inode(inode, inode->i_mode, fattr->rdev);
707
708 nfsi->read_cache_jiffies = fattr->timestamp;
709 inode->i_atime = fattr->atime;
710 inode->i_mtime = fattr->mtime;
711 inode->i_ctime = fattr->ctime;
712 if (fattr->valid & NFS_ATTR_FATTR_V4)
713 nfsi->change_attr = fattr->change_attr;
714 inode->i_size = nfs_size_to_loff_t(fattr->size);
715 inode->i_nlink = fattr->nlink;
716 inode->i_uid = fattr->uid;
717 inode->i_gid = fattr->gid;
718 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
719 /*
720 * report the blocks in 512byte units
721 */
722 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
723 inode->i_blksize = inode->i_sb->s_blocksize;
724 } else {
725 inode->i_blocks = fattr->du.nfs2.blocks;
726 inode->i_blksize = fattr->du.nfs2.blocksize;
727 }
728 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
729 nfsi->attrtimeo_timestamp = jiffies;
730 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
731 nfsi->cache_access.cred = NULL;
732
733 unlock_new_inode(inode);
734 } else
735 nfs_refresh_inode(inode, fattr);
736 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
737 inode->i_sb->s_id,
738 (long long)NFS_FILEID(inode),
739 atomic_read(&inode->i_count));
740
741out:
742 return inode;
743
744out_no_inode:
745 printk("nfs_fhget: iget failed\n");
746 goto out;
747}
748
749#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
750
751int
752nfs_setattr(struct dentry *dentry, struct iattr *attr)
753{
754 struct inode *inode = dentry->d_inode;
755 struct nfs_fattr fattr;
756 int error;
757
758 if (attr->ia_valid & ATTR_SIZE) {
759 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
760 attr->ia_valid &= ~ATTR_SIZE;
761 }
762
763 /* Optimization: if the end result is no change, don't RPC */
764 attr->ia_valid &= NFS_VALID_ATTRS;
765 if (attr->ia_valid == 0)
766 return 0;
767
768 lock_kernel();
769 nfs_begin_data_update(inode);
770 /* Write all dirty data if we're changing file permissions or size */
771 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
772 if (filemap_fdatawrite(inode->i_mapping) == 0)
773 filemap_fdatawait(inode->i_mapping);
774 nfs_wb_all(inode);
775 }
776 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
777 if (error == 0) {
778 nfs_refresh_inode(inode, &fattr);
779 if ((attr->ia_valid & ATTR_MODE) != 0) {
780 int mode;
781 mode = inode->i_mode & ~S_IALLUGO;
782 mode |= attr->ia_mode & S_IALLUGO;
783 inode->i_mode = mode;
784 }
785 if ((attr->ia_valid & ATTR_UID) != 0)
786 inode->i_uid = attr->ia_uid;
787 if ((attr->ia_valid & ATTR_GID) != 0)
788 inode->i_gid = attr->ia_gid;
789 if ((attr->ia_valid & ATTR_SIZE) != 0) {
790 inode->i_size = attr->ia_size;
791 vmtruncate(inode, attr->ia_size);
792 }
793 }
794 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
795 NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS;
796 nfs_end_data_update(inode);
797 unlock_kernel();
798 return error;
799}
800
801/*
802 * Wait for the inode to get unlocked.
803 * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING).
804 */
805static int
806nfs_wait_on_inode(struct inode *inode, int flag)
807{
808 struct rpc_clnt *clnt = NFS_CLIENT(inode);
809 struct nfs_inode *nfsi = NFS_I(inode);
810
811 int error;
812 if (!(NFS_FLAGS(inode) & flag))
813 return 0;
814 atomic_inc(&inode->i_count);
815 error = nfs_wait_event(clnt, nfsi->nfs_i_wait,
816 !(NFS_FLAGS(inode) & flag));
817 iput(inode);
818 return error;
819}
820
821int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
822{
823 struct inode *inode = dentry->d_inode;
824 struct nfs_inode *nfsi = NFS_I(inode);
825 int need_atime = nfsi->flags & NFS_INO_INVALID_ATIME;
826 int err;
827
828 if (__IS_FLG(inode, MS_NOATIME))
829 need_atime = 0;
830 else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
831 need_atime = 0;
832 /* We may force a getattr if the user cares about atime */
833 if (need_atime)
834 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
835 else
836 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
837 if (!err)
838 generic_fillattr(inode, stat);
839 return err;
840}
841
842struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
843{
844 struct nfs_open_context *ctx;
845
846 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
847 if (ctx != NULL) {
848 atomic_set(&ctx->count, 1);
849 ctx->dentry = dget(dentry);
850 ctx->cred = get_rpccred(cred);
851 ctx->state = NULL;
852 ctx->lockowner = current->files;
853 ctx->error = 0;
854 init_waitqueue_head(&ctx->waitq);
855 }
856 return ctx;
857}
858
859struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
860{
861 if (ctx != NULL)
862 atomic_inc(&ctx->count);
863 return ctx;
864}
865
866void put_nfs_open_context(struct nfs_open_context *ctx)
867{
868 if (atomic_dec_and_test(&ctx->count)) {
869 if (!list_empty(&ctx->list)) {
870 struct inode *inode = ctx->dentry->d_inode;
871 spin_lock(&inode->i_lock);
872 list_del(&ctx->list);
873 spin_unlock(&inode->i_lock);
874 }
875 if (ctx->state != NULL)
876 nfs4_close_state(ctx->state, ctx->mode);
877 if (ctx->cred != NULL)
878 put_rpccred(ctx->cred);
879 dput(ctx->dentry);
880 kfree(ctx);
881 }
882}
883
884/*
885 * Ensure that mmap has a recent RPC credential for use when writing out
886 * shared pages
887 */
888void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
889{
890 struct inode *inode = filp->f_dentry->d_inode;
891 struct nfs_inode *nfsi = NFS_I(inode);
892
893 filp->private_data = get_nfs_open_context(ctx);
894 spin_lock(&inode->i_lock);
895 list_add(&ctx->list, &nfsi->open_files);
896 spin_unlock(&inode->i_lock);
897}
898
899struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode)
900{
901 struct nfs_inode *nfsi = NFS_I(inode);
902 struct nfs_open_context *pos, *ctx = NULL;
903
904 spin_lock(&inode->i_lock);
905 list_for_each_entry(pos, &nfsi->open_files, list) {
906 if ((pos->mode & mode) == mode) {
907 ctx = get_nfs_open_context(pos);
908 break;
909 }
910 }
911 spin_unlock(&inode->i_lock);
912 return ctx;
913}
914
915void nfs_file_clear_open_context(struct file *filp)
916{
917 struct inode *inode = filp->f_dentry->d_inode;
918 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
919
920 if (ctx) {
921 filp->private_data = NULL;
922 spin_lock(&inode->i_lock);
923 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
924 spin_unlock(&inode->i_lock);
925 put_nfs_open_context(ctx);
926 }
927}
928
929/*
930 * These allocate and release file read/write context information.
931 */
932int nfs_open(struct inode *inode, struct file *filp)
933{
934 struct nfs_open_context *ctx;
935 struct rpc_cred *cred;
936
937 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
938 if (IS_ERR(cred))
939 return PTR_ERR(cred);
940 ctx = alloc_nfs_open_context(filp->f_dentry, cred);
941 put_rpccred(cred);
942 if (ctx == NULL)
943 return -ENOMEM;
944 ctx->mode = filp->f_mode;
945 nfs_file_set_open_context(filp, ctx);
946 put_nfs_open_context(ctx);
947 if ((filp->f_mode & FMODE_WRITE) != 0)
948 nfs_begin_data_update(inode);
949 return 0;
950}
951
952int nfs_release(struct inode *inode, struct file *filp)
953{
954 if ((filp->f_mode & FMODE_WRITE) != 0)
955 nfs_end_data_update(inode);
956 nfs_file_clear_open_context(filp);
957 return 0;
958}
959
960/*
961 * This function is called whenever some part of NFS notices that
962 * the cached attributes have to be refreshed.
963 */
964int
965__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
966{
967 int status = -ESTALE;
968 struct nfs_fattr fattr;
969 struct nfs_inode *nfsi = NFS_I(inode);
970 unsigned long verifier;
971 unsigned int flags;
972
973 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
974 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
975
976 lock_kernel();
977 if (!inode || is_bad_inode(inode))
978 goto out_nowait;
979 if (NFS_STALE(inode))
980 goto out_nowait;
981
982 while (NFS_REVALIDATING(inode)) {
983 status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING);
984 if (status < 0)
985 goto out_nowait;
986 if (NFS_ATTRTIMEO(inode) == 0)
987 continue;
988 if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME))
989 continue;
990 status = NFS_STALE(inode) ? -ESTALE : 0;
991 goto out_nowait;
992 }
993 NFS_FLAGS(inode) |= NFS_INO_REVALIDATING;
994
995 /* Protect against RPC races by saving the change attribute */
996 verifier = nfs_save_change_attribute(inode);
997 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
998 if (status != 0) {
999 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1000 inode->i_sb->s_id,
1001 (long long)NFS_FILEID(inode), status);
1002 if (status == -ESTALE) {
1003 nfs_zap_caches(inode);
1004 if (!S_ISDIR(inode->i_mode))
1005 NFS_FLAGS(inode) |= NFS_INO_STALE;
1006 }
1007 goto out;
1008 }
1009
1010 status = nfs_update_inode(inode, &fattr, verifier);
1011 if (status) {
1012 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1013 inode->i_sb->s_id,
1014 (long long)NFS_FILEID(inode), status);
1015 goto out;
1016 }
1017 flags = nfsi->flags;
1018 /*
1019 * We may need to keep the attributes marked as invalid if
1020 * we raced with nfs_end_attr_update().
1021 */
1022 if (verifier == nfsi->cache_change_attribute)
1023 nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1024 /* Do the page cache invalidation */
1025 if (flags & NFS_INO_INVALID_DATA) {
1026 if (S_ISREG(inode->i_mode)) {
1027 if (filemap_fdatawrite(inode->i_mapping) == 0)
1028 filemap_fdatawait(inode->i_mapping);
1029 nfs_wb_all(inode);
1030 }
1031 nfsi->flags &= ~NFS_INO_INVALID_DATA;
1032 invalidate_inode_pages2(inode->i_mapping);
1033 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
1034 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1035 inode->i_sb->s_id,
1036 (long long)NFS_FILEID(inode));
1037 /* This ensures we revalidate dentries */
1038 nfsi->cache_change_attribute++;
1039 }
1040 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1041 inode->i_sb->s_id,
1042 (long long)NFS_FILEID(inode));
1043
1044out:
1045 NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING;
1046 wake_up(&nfsi->nfs_i_wait);
1047 out_nowait:
1048 unlock_kernel();
1049 return status;
1050}
1051
1052int nfs_attribute_timeout(struct inode *inode)
1053{
1054 struct nfs_inode *nfsi = NFS_I(inode);
1055
1056 if (nfs_have_delegation(inode, FMODE_READ))
1057 return 0;
1058 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1059}
1060
1061/**
1062 * nfs_revalidate_inode - Revalidate the inode attributes
1063 * @server - pointer to nfs_server struct
1064 * @inode - pointer to inode struct
1065 *
1066 * Updates inode attribute information by retrieving the data from the server.
1067 */
1068int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1069{
1070 if (!(NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1071 && !nfs_attribute_timeout(inode))
1072 return NFS_STALE(inode) ? -ESTALE : 0;
1073 return __nfs_revalidate_inode(server, inode);
1074}
1075
1076/**
1077 * nfs_begin_data_update
1078 * @inode - pointer to inode
1079 * Declare that a set of operations will update file data on the server
1080 */
1081void nfs_begin_data_update(struct inode *inode)
1082{
1083 atomic_inc(&NFS_I(inode)->data_updates);
1084}
1085
1086/**
1087 * nfs_end_data_update
1088 * @inode - pointer to inode
1089 * Declare end of the operations that will update file data
1090 * This will mark the inode as immediately needing revalidation
1091 * of its attribute cache.
1092 */
1093void nfs_end_data_update(struct inode *inode)
1094{
1095 struct nfs_inode *nfsi = NFS_I(inode);
1096
1097 if (!nfs_have_delegation(inode, FMODE_READ)) {
1098 /* Mark the attribute cache for revalidation */
1099 nfsi->flags |= NFS_INO_INVALID_ATTR;
1100 /* Directories and symlinks: invalidate page cache too */
1101 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1102 nfsi->flags |= NFS_INO_INVALID_DATA;
1103 }
1104 nfsi->cache_change_attribute ++;
1105 atomic_dec(&nfsi->data_updates);
1106}
1107
1108/**
1109 * nfs_end_data_update_defer
1110 * @inode - pointer to inode
1111 * Declare end of the operations that will update file data
1112 * This will defer marking the inode as needing revalidation
1113 * unless there are no other pending updates.
1114 */
1115void nfs_end_data_update_defer(struct inode *inode)
1116{
1117 struct nfs_inode *nfsi = NFS_I(inode);
1118
1119 if (atomic_dec_and_test(&nfsi->data_updates)) {
1120 /* Mark the attribute cache for revalidation */
1121 nfsi->flags |= NFS_INO_INVALID_ATTR;
1122 /* Directories and symlinks: invalidate page cache too */
1123 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1124 nfsi->flags |= NFS_INO_INVALID_DATA;
1125 nfsi->cache_change_attribute ++;
1126 }
1127}
1128
1129/**
1130 * nfs_refresh_inode - verify consistency of the inode attribute cache
1131 * @inode - pointer to inode
1132 * @fattr - updated attributes
1133 *
1134 * Verifies the attribute cache. If we have just changed the attributes,
1135 * so that fattr carries weak cache consistency data, then it may
1136 * also update the ctime/mtime/change_attribute.
1137 */
1138int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1139{
1140 struct nfs_inode *nfsi = NFS_I(inode);
1141 loff_t cur_size, new_isize;
1142 int data_unstable;
1143
1144 /* Do we hold a delegation? */
1145 if (nfs_have_delegation(inode, FMODE_READ))
1146 return 0;
1147
1148 /* Are we in the process of updating data on the server? */
1149 data_unstable = nfs_caches_unstable(inode);
1150
1151 if (fattr->valid & NFS_ATTR_FATTR_V4) {
1152 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1153 && nfsi->change_attr == fattr->pre_change_attr)
1154 nfsi->change_attr = fattr->change_attr;
1155 if (!data_unstable && nfsi->change_attr != fattr->change_attr)
1156 nfsi->flags |= NFS_INO_INVALID_ATTR;
1157 }
1158
1159 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1160 return 0;
1161
1162 /* Has the inode gone and changed behind our back? */
1163 if (nfsi->fileid != fattr->fileid
1164 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1165 return -EIO;
1166
1167 cur_size = i_size_read(inode);
1168 new_isize = nfs_size_to_loff_t(fattr->size);
1169
1170 /* If we have atomic WCC data, we may update some attributes */
1171 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1172 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
1173 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1174 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
1175 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1176 }
1177
1178 /* Verify a few of the more important attributes */
1179 if (!data_unstable) {
1180 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)
1181 || cur_size != new_isize)
1182 nfsi->flags |= NFS_INO_INVALID_ATTR;
1183 } else if (S_ISREG(inode->i_mode) && new_isize > cur_size)
1184 nfsi->flags |= NFS_INO_INVALID_ATTR;
1185
1186 /* Have any file permissions changed? */
1187 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1188 || inode->i_uid != fattr->uid
1189 || inode->i_gid != fattr->gid)
1190 nfsi->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
1191
1192 /* Has the link count changed? */
1193 if (inode->i_nlink != fattr->nlink)
1194 nfsi->flags |= NFS_INO_INVALID_ATTR;
1195
1196 if (!timespec_equal(&inode->i_atime, &fattr->atime))
1197 nfsi->flags |= NFS_INO_INVALID_ATIME;
1198
1199 nfsi->read_cache_jiffies = fattr->timestamp;
1200 return 0;
1201}
1202
1203/*
1204 * Many nfs protocol calls return the new file attributes after
1205 * an operation. Here we update the inode to reflect the state
1206 * of the server's inode.
1207 *
1208 * This is a bit tricky because we have to make sure all dirty pages
1209 * have been sent off to the server before calling invalidate_inode_pages.
1210 * To make sure no other process adds more write requests while we try
1211 * our best to flush them, we make them sleep during the attribute refresh.
1212 *
1213 * A very similar scenario holds for the dir cache.
1214 */
1215static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
1216{
1217 struct nfs_inode *nfsi = NFS_I(inode);
1218 __u64 new_size;
1219 loff_t new_isize;
1220 unsigned int invalid = 0;
1221 loff_t cur_isize;
1222 int data_unstable;
1223
1224 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1225 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1226 atomic_read(&inode->i_count), fattr->valid);
1227
1228 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1229 return 0;
1230
1231 if (nfsi->fileid != fattr->fileid) {
1232 printk(KERN_ERR "%s: inode number mismatch\n"
1233 "expected (%s/0x%Lx), got (%s/0x%Lx)\n",
1234 __FUNCTION__,
1235 inode->i_sb->s_id, (long long)nfsi->fileid,
1236 inode->i_sb->s_id, (long long)fattr->fileid);
1237 goto out_err;
1238 }
1239
1240 /*
1241 * Make sure the inode's type hasn't changed.
1242 */
1243 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1244 goto out_changed;
1245
1246 /*
1247 * Update the read time so we don't revalidate too often.
1248 */
1249 nfsi->read_cache_jiffies = fattr->timestamp;
1250
1251 /* Are we racing with known updates of the metadata on the server? */
1252 data_unstable = ! nfs_verify_change_attribute(inode, verifier);
1253
1254 /* Check if the file size agrees */
1255 new_size = fattr->size;
1256 new_isize = nfs_size_to_loff_t(fattr->size);
1257 cur_isize = i_size_read(inode);
1258 if (cur_isize != new_size) {
1259#ifdef NFS_DEBUG_VERBOSE
1260 printk(KERN_DEBUG "NFS: isize change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
1261#endif
1262 /*
1263 * If we have pending writebacks, things can get
1264 * messy.
1265 */
1266 if (S_ISREG(inode->i_mode) && data_unstable) {
1267 if (new_isize > cur_isize) {
1268 inode->i_size = new_isize;
1269 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1270 }
1271 } else {
1272 inode->i_size = new_isize;
1273 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1274 }
1275 }
1276
1277 /*
1278 * Note: we don't check inode->i_mtime since pipes etc.
1279 * can change this value in VFS without requiring a
1280 * cache revalidation.
1281 */
1282 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1283 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1284#ifdef NFS_DEBUG_VERBOSE
1285 printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
1286#endif
1287 if (!data_unstable)
1288 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1289 }
1290
1291 if ((fattr->valid & NFS_ATTR_FATTR_V4)
1292 && nfsi->change_attr != fattr->change_attr) {
1293#ifdef NFS_DEBUG_VERBOSE
1294 printk(KERN_DEBUG "NFS: change_attr change on %s/%ld\n",
1295 inode->i_sb->s_id, inode->i_ino);
1296#endif
1297 nfsi->change_attr = fattr->change_attr;
1298 if (!data_unstable)
1299 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS;
1300 }
1301
1302 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1303 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1304
1305 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1306 inode->i_uid != fattr->uid ||
1307 inode->i_gid != fattr->gid)
1308 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
1309
1310 inode->i_mode = fattr->mode;
1311 inode->i_nlink = fattr->nlink;
1312 inode->i_uid = fattr->uid;
1313 inode->i_gid = fattr->gid;
1314
1315 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1316 /*
1317 * report the blocks in 512byte units
1318 */
1319 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1320 inode->i_blksize = inode->i_sb->s_blocksize;
1321 } else {
1322 inode->i_blocks = fattr->du.nfs2.blocks;
1323 inode->i_blksize = fattr->du.nfs2.blocksize;
1324 }
1325
1326 /* Update attrtimeo value if we're out of the unstable period */
1327 if (invalid & NFS_INO_INVALID_ATTR) {
1328 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1329 nfsi->attrtimeo_timestamp = jiffies;
1330 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1331 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1332 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1333 nfsi->attrtimeo_timestamp = jiffies;
1334 }
1335 /* Don't invalidate the data if we were to blame */
1336 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1337 || S_ISLNK(inode->i_mode)))
1338 invalid &= ~NFS_INO_INVALID_DATA;
1339 if (!nfs_have_delegation(inode, FMODE_READ))
1340 nfsi->flags |= invalid;
1341
1342 return 0;
1343 out_changed:
1344 /*
1345 * Big trouble! The inode has become a different object.
1346 */
1347#ifdef NFS_PARANOIA
1348 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1349 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1350#endif
1351 /*
1352 * No need to worry about unhashing the dentry, as the
1353 * lookup validation will know that the inode is bad.
1354 * (But we fall through to invalidate the caches.)
1355 */
1356 nfs_invalidate_inode(inode);
1357 out_err:
1358 NFS_FLAGS(inode) |= NFS_INO_STALE;
1359 return -ESTALE;
1360}
1361
1362/*
1363 * File system information
1364 */
1365
1366static int nfs_set_super(struct super_block *s, void *data)
1367{
1368 s->s_fs_info = data;
1369 return set_anon_super(s, data);
1370}
1371
1372static int nfs_compare_super(struct super_block *sb, void *data)
1373{
1374 struct nfs_server *server = data;
1375 struct nfs_server *old = NFS_SB(sb);
1376
1377 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1378 return 0;
1379 if (old->addr.sin_port != server->addr.sin_port)
1380 return 0;
1381 return !nfs_compare_fh(&old->fh, &server->fh);
1382}
1383
1384static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1385 int flags, const char *dev_name, void *raw_data)
1386{
1387 int error;
1388 struct nfs_server *server;
1389 struct super_block *s;
1390 struct nfs_fh *root;
1391 struct nfs_mount_data *data = raw_data;
1392
1393 if (!data) {
1394 printk("nfs_read_super: missing data argument\n");
1395 return ERR_PTR(-EINVAL);
1396 }
1397
1398 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1399 if (!server)
1400 return ERR_PTR(-ENOMEM);
1401 memset(server, 0, sizeof(struct nfs_server));
1402 /* Zero out the NFS state stuff */
1403 init_nfsv4_state(server);
1404
1405 if (data->version != NFS_MOUNT_VERSION) {
1406 printk("nfs warning: mount version %s than kernel\n",
1407 data->version < NFS_MOUNT_VERSION ? "older" : "newer");
1408 if (data->version < 2)
1409 data->namlen = 0;
1410 if (data->version < 3)
1411 data->bsize = 0;
1412 if (data->version < 4) {
1413 data->flags &= ~NFS_MOUNT_VER3;
1414 data->root.size = NFS2_FHSIZE;
1415 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1416 }
1417 if (data->version < 5)
1418 data->flags &= ~NFS_MOUNT_SECFLAVOUR;
1419 }
1420
1421 root = &server->fh;
1422 if (data->flags & NFS_MOUNT_VER3)
1423 root->size = data->root.size;
1424 else
1425 root->size = NFS2_FHSIZE;
1426 if (root->size > sizeof(root->data)) {
1427 printk("nfs_get_sb: invalid root filehandle\n");
1428 kfree(server);
1429 return ERR_PTR(-EINVAL);
1430 }
1431 memcpy(root->data, data->root.data, root->size);
1432
1433 /* We now require that the mount process passes the remote address */
1434 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1435 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1436 printk("NFS: mount program didn't pass remote address!\n");
1437 kfree(server);
1438 return ERR_PTR(-EINVAL);
1439 }
1440
1441 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1442
1443 if (IS_ERR(s) || s->s_root) {
1444 kfree(server);
1445 return s;
1446 }
1447
1448 s->s_flags = flags;
1449
1450 /* Fire up rpciod if not yet running */
1451 if (rpciod_up() != 0) {
1452 printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
1453 kfree(server);
1454 return ERR_PTR(-EIO);
1455 }
1456
1457 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1458 if (error) {
1459 up_write(&s->s_umount);
1460 deactivate_super(s);
1461 return ERR_PTR(error);
1462 }
1463 s->s_flags |= MS_ACTIVE;
1464 return s;
1465}
1466
1467static void nfs_kill_super(struct super_block *s)
1468{
1469 struct nfs_server *server = NFS_SB(s);
1470
1471 kill_anon_super(s);
1472
1473 if (server->client != NULL && !IS_ERR(server->client))
1474 rpc_shutdown_client(server->client);
1475 if (server->client_sys != NULL && !IS_ERR(server->client_sys))
1476 rpc_shutdown_client(server->client_sys);
1477
1478 if (!(server->flags & NFS_MOUNT_NONLM))
1479 lockd_down(); /* release rpc.lockd */
1480
1481 rpciod_down(); /* release rpciod */
1482
1483 if (server->hostname != NULL)
1484 kfree(server->hostname);
1485 kfree(server);
1486}
1487
1488static struct file_system_type nfs_fs_type = {
1489 .owner = THIS_MODULE,
1490 .name = "nfs",
1491 .get_sb = nfs_get_sb,
1492 .kill_sb = nfs_kill_super,
1493 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1494};
1495
1496#ifdef CONFIG_NFS_V4
1497
1498static void nfs4_clear_inode(struct inode *);
1499
1500
1501static struct super_operations nfs4_sops = {
1502 .alloc_inode = nfs_alloc_inode,
1503 .destroy_inode = nfs_destroy_inode,
1504 .write_inode = nfs_write_inode,
1505 .delete_inode = nfs_delete_inode,
1506 .statfs = nfs_statfs,
1507 .clear_inode = nfs4_clear_inode,
1508 .umount_begin = nfs_umount_begin,
1509 .show_options = nfs_show_options,
1510};
1511
1512/*
1513 * Clean out any remaining NFSv4 state that might be left over due
1514 * to open() calls that passed nfs_atomic_lookup, but failed to call
1515 * nfs_open().
1516 */
1517static void nfs4_clear_inode(struct inode *inode)
1518{
1519 struct nfs_inode *nfsi = NFS_I(inode);
1520
1521 /* If we are holding a delegation, return it! */
1522 if (nfsi->delegation != NULL)
1523 nfs_inode_return_delegation(inode);
1524 /* First call standard NFS clear_inode() code */
1525 nfs_clear_inode(inode);
1526 /* Now clear out any remaining state */
1527 while (!list_empty(&nfsi->open_states)) {
1528 struct nfs4_state *state;
1529
1530 state = list_entry(nfsi->open_states.next,
1531 struct nfs4_state,
1532 inode_states);
1533 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1534 __FUNCTION__,
1535 inode->i_sb->s_id,
1536 (long long)NFS_FILEID(inode),
1537 state);
1538 BUG_ON(atomic_read(&state->count) != 1);
1539 nfs4_close_state(state, state->state);
1540 }
1541}
1542
1543
1544static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1545{
1546 struct nfs_server *server;
1547 struct nfs4_client *clp = NULL;
1548 struct rpc_xprt *xprt = NULL;
1549 struct rpc_clnt *clnt = NULL;
1550 struct rpc_timeout timeparms;
1551 rpc_authflavor_t authflavour;
1552 int proto, err = -EIO;
1553
1554 sb->s_blocksize_bits = 0;
1555 sb->s_blocksize = 0;
1556 server = NFS_SB(sb);
1557 if (data->rsize != 0)
1558 server->rsize = nfs_block_size(data->rsize, NULL);
1559 if (data->wsize != 0)
1560 server->wsize = nfs_block_size(data->wsize, NULL);
1561 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1562 server->caps = NFS_CAP_ATOMIC_OPEN;
1563
1564 server->acregmin = data->acregmin*HZ;
1565 server->acregmax = data->acregmax*HZ;
1566 server->acdirmin = data->acdirmin*HZ;
1567 server->acdirmax = data->acdirmax*HZ;
1568
1569 server->rpc_ops = &nfs_v4_clientops;
1570 /* Initialize timeout values */
1571
1572 timeparms.to_initval = data->timeo * HZ / 10;
1573 timeparms.to_retries = data->retrans;
1574 timeparms.to_exponential = 1;
1575 if (!timeparms.to_retries)
1576 timeparms.to_retries = 5;
1577
1578 proto = data->proto;
1579 /* Which IP protocol do we use? */
1580 switch (proto) {
1581 case IPPROTO_TCP:
1582 timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT;
1583 if (!timeparms.to_initval)
1584 timeparms.to_initval = 600 * HZ / 10;
1585 break;
1586 case IPPROTO_UDP:
1587 timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT;
1588 if (!timeparms.to_initval)
1589 timeparms.to_initval = 11 * HZ / 10;
1590 break;
1591 default:
1592 return -EINVAL;
1593 }
1594
1595 clp = nfs4_get_client(&server->addr.sin_addr);
1596 if (!clp) {
1597 printk(KERN_WARNING "NFS: failed to create NFS4 client.\n");
1598 return -EIO;
1599 }
1600
1601 /* Now create transport and client */
1602 authflavour = RPC_AUTH_UNIX;
1603 if (data->auth_flavourlen != 0) {
1604 if (data->auth_flavourlen > 1)
1605 printk(KERN_INFO "NFS: cannot yet deal with multiple auth flavours.\n");
1606 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1607 err = -EFAULT;
1608 goto out_fail;
1609 }
1610 }
1611
1612 down_write(&clp->cl_sem);
1613 if (clp->cl_rpcclient == NULL) {
1614 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
1615 if (IS_ERR(xprt)) {
1616 up_write(&clp->cl_sem);
1617 printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
1618 err = PTR_ERR(xprt);
1619 goto out_fail;
1620 }
1621 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1622 server->rpc_ops->version, authflavour);
1623 if (IS_ERR(clnt)) {
1624 up_write(&clp->cl_sem);
1625 printk(KERN_WARNING "NFS: cannot create RPC client.\n");
1626 xprt_destroy(xprt);
1627 err = PTR_ERR(clnt);
1628 goto out_fail;
1629 }
1630 clnt->cl_intr = 1;
1631 clnt->cl_softrtry = 1;
1632 clnt->cl_chatty = 1;
1633 clp->cl_rpcclient = clnt;
1634 clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
1635 if (IS_ERR(clp->cl_cred)) {
1636 up_write(&clp->cl_sem);
1637 err = PTR_ERR(clp->cl_cred);
1638 clp->cl_cred = NULL;
1639 goto out_fail;
1640 }
1641 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1642 nfs_idmap_new(clp);
1643 }
1644 if (list_empty(&clp->cl_superblocks)) {
1645 err = nfs4_init_client(clp);
1646 if (err != 0) {
1647 up_write(&clp->cl_sem);
1648 goto out_fail;
1649 }
1650 }
1651 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1652 clnt = rpc_clone_client(clp->cl_rpcclient);
1653 if (!IS_ERR(clnt))
1654 server->nfs4_state = clp;
1655 up_write(&clp->cl_sem);
1656 clp = NULL;
1657
1658 if (IS_ERR(clnt)) {
1659 printk(KERN_WARNING "NFS: cannot create RPC client.\n");
1660 return PTR_ERR(clnt);
1661 }
1662
1663 server->client = clnt;
1664
1665 if (server->nfs4_state->cl_idmap == NULL) {
1666 printk(KERN_WARNING "NFS: failed to create idmapper.\n");
1667 return -ENOMEM;
1668 }
1669
1670 if (clnt->cl_auth->au_flavor != authflavour) {
1671 if (rpcauth_create(authflavour, clnt) == NULL) {
1672 printk(KERN_WARNING "NFS: couldn't create credcache!\n");
1673 return -ENOMEM;
1674 }
1675 }
1676
1677 sb->s_time_gran = 1;
1678
1679 sb->s_op = &nfs4_sops;
1680 err = nfs_sb_init(sb, authflavour);
1681 if (err == 0)
1682 return 0;
1683out_fail:
1684 if (clp)
1685 nfs4_put_client(clp);
1686 return err;
1687}
1688
1689static int nfs4_compare_super(struct super_block *sb, void *data)
1690{
1691 struct nfs_server *server = data;
1692 struct nfs_server *old = NFS_SB(sb);
1693
1694 if (strcmp(server->hostname, old->hostname) != 0)
1695 return 0;
1696 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1697 return 0;
1698 return 1;
1699}
1700
1701static void *
1702nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1703{
1704 void *p = NULL;
1705
1706 if (!src->len)
1707 return ERR_PTR(-EINVAL);
1708 if (src->len < maxlen)
1709 maxlen = src->len;
1710 if (dst == NULL) {
1711 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1712 if (p == NULL)
1713 return ERR_PTR(-ENOMEM);
1714 }
1715 if (copy_from_user(dst, src->data, maxlen)) {
1716 if (p != NULL)
1717 kfree(p);
1718 return ERR_PTR(-EFAULT);
1719 }
1720 dst[maxlen] = '\0';
1721 return dst;
1722}
1723
1724static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1725 int flags, const char *dev_name, void *raw_data)
1726{
1727 int error;
1728 struct nfs_server *server;
1729 struct super_block *s;
1730 struct nfs4_mount_data *data = raw_data;
1731 void *p;
1732
1733 if (!data) {
1734 printk("nfs_read_super: missing data argument\n");
1735 return ERR_PTR(-EINVAL);
1736 }
1737
1738 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1739 if (!server)
1740 return ERR_PTR(-ENOMEM);
1741 memset(server, 0, sizeof(struct nfs_server));
1742 /* Zero out the NFS state stuff */
1743 init_nfsv4_state(server);
1744
1745 if (data->version != NFS4_MOUNT_VERSION) {
1746 printk("nfs warning: mount version %s than kernel\n",
1747 data->version < NFS4_MOUNT_VERSION ? "older" : "newer");
1748 }
1749
1750 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1751 if (IS_ERR(p))
1752 goto out_err;
1753 server->hostname = p;
1754
1755 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1756 if (IS_ERR(p))
1757 goto out_err;
1758 server->mnt_path = p;
1759
1760 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1761 sizeof(server->ip_addr) - 1);
1762 if (IS_ERR(p))
1763 goto out_err;
1764
1765 /* We now require that the mount process passes the remote address */
1766 if (data->host_addrlen != sizeof(server->addr)) {
1767 s = ERR_PTR(-EINVAL);
1768 goto out_free;
1769 }
1770 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1771 s = ERR_PTR(-EFAULT);
1772 goto out_free;
1773 }
1774 if (server->addr.sin_family != AF_INET ||
1775 server->addr.sin_addr.s_addr == INADDR_ANY) {
1776 printk("NFS: mount program didn't pass remote IP address!\n");
1777 s = ERR_PTR(-EINVAL);
1778 goto out_free;
1779 }
1780
1781 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
1782
1783 if (IS_ERR(s) || s->s_root)
1784 goto out_free;
1785
1786 s->s_flags = flags;
1787
1788 /* Fire up rpciod if not yet running */
1789 if (rpciod_up() != 0) {
1790 printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
1791 s = ERR_PTR(-EIO);
1792 goto out_free;
1793 }
1794
1795 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1796 if (error) {
1797 up_write(&s->s_umount);
1798 deactivate_super(s);
1799 return ERR_PTR(error);
1800 }
1801 s->s_flags |= MS_ACTIVE;
1802 return s;
1803out_err:
1804 s = (struct super_block *)p;
1805out_free:
1806 if (server->mnt_path)
1807 kfree(server->mnt_path);
1808 if (server->hostname)
1809 kfree(server->hostname);
1810 kfree(server);
1811 return s;
1812}
1813
1814static void nfs4_kill_super(struct super_block *sb)
1815{
1816 struct nfs_server *server = NFS_SB(sb);
1817
1818 nfs_return_all_delegations(sb);
1819 kill_anon_super(sb);
1820
1821 nfs4_renewd_prepare_shutdown(server);
1822
1823 if (server->client != NULL && !IS_ERR(server->client))
1824 rpc_shutdown_client(server->client);
1825 rpciod_down(); /* release rpciod */
1826
1827 destroy_nfsv4_state(server);
1828
1829 if (server->hostname != NULL)
1830 kfree(server->hostname);
1831 kfree(server);
1832}
1833
1834static struct file_system_type nfs4_fs_type = {
1835 .owner = THIS_MODULE,
1836 .name = "nfs4",
1837 .get_sb = nfs4_get_sb,
1838 .kill_sb = nfs4_kill_super,
1839 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1840};
1841
1842#define nfs4_init_once(nfsi) \
1843 do { \
1844 INIT_LIST_HEAD(&(nfsi)->open_states); \
1845 nfsi->delegation = NULL; \
1846 nfsi->delegation_state = 0; \
1847 init_rwsem(&nfsi->rwsem); \
1848 } while(0)
1849#define register_nfs4fs() register_filesystem(&nfs4_fs_type)
1850#define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
1851#else
1852#define nfs4_init_once(nfsi) \
1853 do { } while (0)
1854#define register_nfs4fs() (0)
1855#define unregister_nfs4fs()
1856#endif
1857
1858extern int nfs_init_nfspagecache(void);
1859extern void nfs_destroy_nfspagecache(void);
1860extern int nfs_init_readpagecache(void);
1861extern void nfs_destroy_readpagecache(void);
1862extern int nfs_init_writepagecache(void);
1863extern void nfs_destroy_writepagecache(void);
1864#ifdef CONFIG_NFS_DIRECTIO
1865extern int nfs_init_directcache(void);
1866extern void nfs_destroy_directcache(void);
1867#endif
1868
1869static kmem_cache_t * nfs_inode_cachep;
1870
1871static struct inode *nfs_alloc_inode(struct super_block *sb)
1872{
1873 struct nfs_inode *nfsi;
1874 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
1875 if (!nfsi)
1876 return NULL;
1877 nfsi->flags = 0;
1878 return &nfsi->vfs_inode;
1879}
1880
1881static void nfs_destroy_inode(struct inode *inode)
1882{
1883 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1884}
1885
1886static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
1887{
1888 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1889
1890 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
1891 SLAB_CTOR_CONSTRUCTOR) {
1892 inode_init_once(&nfsi->vfs_inode);
1893 spin_lock_init(&nfsi->req_lock);
1894 INIT_LIST_HEAD(&nfsi->dirty);
1895 INIT_LIST_HEAD(&nfsi->commit);
1896 INIT_LIST_HEAD(&nfsi->open_files);
1897 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1898 atomic_set(&nfsi->data_updates, 0);
1899 nfsi->ndirty = 0;
1900 nfsi->ncommit = 0;
1901 nfsi->npages = 0;
1902 init_waitqueue_head(&nfsi->nfs_i_wait);
1903 nfs4_init_once(nfsi);
1904 }
1905}
1906
1907int nfs_init_inodecache(void)
1908{
1909 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1910 sizeof(struct nfs_inode),
1911 0, SLAB_RECLAIM_ACCOUNT,
1912 init_once, NULL);
1913 if (nfs_inode_cachep == NULL)
1914 return -ENOMEM;
1915
1916 return 0;
1917}
1918
1919void nfs_destroy_inodecache(void)
1920{
1921 if (kmem_cache_destroy(nfs_inode_cachep))
1922 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
1923}
1924
1925/*
1926 * Initialize NFS
1927 */
1928static int __init init_nfs_fs(void)
1929{
1930 int err;
1931
1932 err = nfs_init_nfspagecache();
1933 if (err)
1934 goto out4;
1935
1936 err = nfs_init_inodecache();
1937 if (err)
1938 goto out3;
1939
1940 err = nfs_init_readpagecache();
1941 if (err)
1942 goto out2;
1943
1944 err = nfs_init_writepagecache();
1945 if (err)
1946 goto out1;
1947
1948#ifdef CONFIG_NFS_DIRECTIO
1949 err = nfs_init_directcache();
1950 if (err)
1951 goto out0;
1952#endif
1953
1954#ifdef CONFIG_PROC_FS
1955 rpc_proc_register(&nfs_rpcstat);
1956#endif
1957 err = register_filesystem(&nfs_fs_type);
1958 if (err)
1959 goto out;
1960 if ((err = register_nfs4fs()) != 0)
1961 goto out;
1962 return 0;
1963out:
1964#ifdef CONFIG_PROC_FS
1965 rpc_proc_unregister("nfs");
1966#endif
1967 nfs_destroy_writepagecache();
1968#ifdef CONFIG_NFS_DIRECTIO
1969out0:
1970 nfs_destroy_directcache();
1971#endif
1972out1:
1973 nfs_destroy_readpagecache();
1974out2:
1975 nfs_destroy_inodecache();
1976out3:
1977 nfs_destroy_nfspagecache();
1978out4:
1979 return err;
1980}
1981
1982static void __exit exit_nfs_fs(void)
1983{
1984#ifdef CONFIG_NFS_DIRECTIO
1985 nfs_destroy_directcache();
1986#endif
1987 nfs_destroy_writepagecache();
1988 nfs_destroy_readpagecache();
1989 nfs_destroy_inodecache();
1990 nfs_destroy_nfspagecache();
1991#ifdef CONFIG_PROC_FS
1992 rpc_proc_unregister("nfs");
1993#endif
1994 unregister_filesystem(&nfs_fs_type);
1995 unregister_nfs4fs();
1996}
1997
1998/* Not quite true; I just maintain it */
1999MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2000MODULE_LICENSE("GPL");
2001
2002module_init(init_nfs_fs)
2003module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)