4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
20 #include <linux/time.h>
21 #include <linux/kernel.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>
39 #include <asm/system.h>
40 #include <asm/uaccess.h>
44 #include "delegation.h"
46 #define NFSDBG_FACILITY NFSDBG_VFS
47 #define NFS_PARANOIA 1
49 /* Maximum number of readahead requests
50 * FIXME: this should really be a sysctl so that users may tune it to suit
51 * their needs. People that do NFS over a slow network, might for
52 * instance want to reduce it to something closer to 1 for improved
53 * interactive response.
55 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
57 static void nfs_invalidate_inode(struct inode *);
58 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
60 static struct inode *nfs_alloc_inode(struct super_block *sb);
61 static void nfs_destroy_inode(struct inode *);
62 static int nfs_write_inode(struct inode *,int);
63 static void nfs_delete_inode(struct inode *);
64 static void nfs_clear_inode(struct inode *);
65 static void nfs_umount_begin(struct super_block *);
66 static int nfs_statfs(struct super_block *, struct kstatfs *);
67 static int nfs_show_options(struct seq_file *, struct vfsmount *);
68 static void nfs_zap_acl_cache(struct inode *);
70 static struct rpc_program nfs_program;
72 static struct super_operations nfs_sops = {
73 .alloc_inode = nfs_alloc_inode,
74 .destroy_inode = nfs_destroy_inode,
75 .write_inode = nfs_write_inode,
76 .delete_inode = nfs_delete_inode,
78 .clear_inode = nfs_clear_inode,
79 .umount_begin = nfs_umount_begin,
80 .show_options = nfs_show_options,
86 static struct rpc_stat nfs_rpcstat = {
87 .program = &nfs_program
89 static struct rpc_version * nfs_version[] = {
93 #if defined(CONFIG_NFS_V3)
95 #elif defined(CONFIG_NFS_V4)
98 #if defined(CONFIG_NFS_V4)
103 static struct rpc_program nfs_program = {
105 .number = NFS_PROGRAM,
106 .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
107 .version = nfs_version,
108 .stats = &nfs_rpcstat,
109 .pipe_dir_name = "/nfs",
112 #ifdef CONFIG_NFS_V3_ACL
113 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
114 static struct rpc_version * nfsacl_version[] = {
115 [3] = &nfsacl_version3,
118 struct rpc_program nfsacl_program = {
120 .number = NFS_ACL_PROGRAM,
121 .nrvers = sizeof(nfsacl_version) / sizeof(nfsacl_version[0]),
122 .version = nfsacl_version,
123 .stats = &nfsacl_rpcstat,
125 #endif /* CONFIG_NFS_V3_ACL */
127 static inline unsigned long
128 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
130 return nfs_fileid_to_ino_t(fattr->fileid);
134 nfs_write_inode(struct inode *inode, int sync)
136 int flags = sync ? FLUSH_WAIT : 0;
139 ret = nfs_commit_inode(inode, flags);
146 nfs_delete_inode(struct inode * inode)
148 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
150 truncate_inode_pages(&inode->i_data, 0);
154 * The following should never happen...
156 if (nfs_have_writebacks(inode)) {
157 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
164 nfs_clear_inode(struct inode *inode)
166 struct nfs_inode *nfsi = NFS_I(inode);
167 struct rpc_cred *cred;
170 BUG_ON (!list_empty(&nfsi->open_files));
171 nfs_zap_acl_cache(inode);
172 cred = nfsi->cache_access.cred;
175 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
179 nfs_umount_begin(struct super_block *sb)
181 struct rpc_clnt *rpc = NFS_SB(sb)->client;
183 /* -EIO all pending I/O */
185 rpc_killall_tasks(rpc);
186 rpc = NFS_SB(sb)->client_acl;
188 rpc_killall_tasks(rpc);
192 static inline unsigned long
193 nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
195 /* make sure blocksize is a power of two */
196 if ((bsize & (bsize - 1)) || nrbitsp) {
197 unsigned char nrbits;
199 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
210 * Calculate the number of 512byte blocks used.
212 static inline unsigned long
213 nfs_calc_block_size(u64 tsize)
215 loff_t used = (tsize + 511) >> 9;
216 return (used > ULONG_MAX) ? ULONG_MAX : used;
220 * Compute and set NFS server blocksize
222 static inline unsigned long
223 nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
225 if (bsize < NFS_MIN_FILE_IO_SIZE)
226 bsize = NFS_DEF_FILE_IO_SIZE;
227 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
228 bsize = NFS_MAX_FILE_IO_SIZE;
230 return nfs_block_bits(bsize, nrbitsp);
234 * Obtain the root inode of the file system.
236 static struct inode *
237 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
239 struct nfs_server *server = NFS_SB(sb);
243 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
245 dprintk("nfs_get_root: getattr error = %d\n", -error);
246 return ERR_PTR(error);
249 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
251 return ERR_PTR(-ENOMEM);
256 * Do NFS version-independent mount processing, and sanity checking
259 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
261 struct nfs_server *server;
262 struct inode *root_inode;
263 struct nfs_fattr fattr;
264 struct nfs_fsinfo fsinfo = {
267 struct nfs_pathconf pathinfo = {
270 int no_root_error = 0;
271 unsigned long max_rpc_payload;
273 /* We probably want something more informative here */
274 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
278 sb->s_magic = NFS_SUPER_MAGIC;
280 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
281 /* Did getting the root inode fail? */
282 if (IS_ERR(root_inode)) {
283 no_root_error = PTR_ERR(root_inode);
286 sb->s_root = d_alloc_root(root_inode);
288 no_root_error = -ENOMEM;
291 sb->s_root->d_op = server->rpc_ops->dentry_ops;
293 /* Get some general file system info */
294 if (server->namelen == 0 &&
295 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
296 server->namelen = pathinfo.max_namelen;
297 /* Work out a lot of parameters */
298 if (server->rsize == 0)
299 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
300 if (server->wsize == 0)
301 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
303 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
304 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
305 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
306 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
308 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
309 if (server->rsize > max_rpc_payload)
310 server->rsize = max_rpc_payload;
311 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
312 server->rsize = NFS_MAX_FILE_IO_SIZE;
313 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
315 if (server->wsize > max_rpc_payload)
316 server->wsize = max_rpc_payload;
317 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
318 server->wsize = NFS_MAX_FILE_IO_SIZE;
319 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
321 if (sb->s_blocksize == 0)
322 sb->s_blocksize = nfs_block_bits(server->wsize,
323 &sb->s_blocksize_bits);
324 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
326 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
327 if (server->dtsize > PAGE_CACHE_SIZE)
328 server->dtsize = PAGE_CACHE_SIZE;
329 if (server->dtsize > server->rsize)
330 server->dtsize = server->rsize;
332 if (server->flags & NFS_MOUNT_NOAC) {
333 server->acregmin = server->acregmax = 0;
334 server->acdirmin = server->acdirmax = 0;
335 sb->s_flags |= MS_SYNCHRONOUS;
337 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
339 sb->s_maxbytes = fsinfo.maxfilesize;
340 if (sb->s_maxbytes > MAX_LFS_FILESIZE)
341 sb->s_maxbytes = MAX_LFS_FILESIZE;
343 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
344 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
346 /* We're airborne Set socket buffersize */
347 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
349 /* Yargs. It didn't work out. */
351 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
352 if (!IS_ERR(root_inode))
354 return no_root_error;
357 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
359 to->to_initval = timeo * HZ / 10;
360 to->to_retries = retrans;
367 to->to_initval = 60 * HZ;
368 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
369 to->to_initval = NFS_MAX_TCP_TIMEOUT;
370 to->to_increment = to->to_initval;
371 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
372 to->to_exponential = 0;
377 to->to_initval = 11 * HZ / 10;
378 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
379 to->to_initval = NFS_MAX_UDP_TIMEOUT;
380 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
381 to->to_exponential = 1;
387 * Create an RPC client handle.
389 static struct rpc_clnt *
390 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
392 struct rpc_timeout timeparms;
393 struct rpc_xprt *xprt = NULL;
394 struct rpc_clnt *clnt = NULL;
395 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
397 nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
399 server->retrans_timeo = timeparms.to_initval;
400 server->retrans_count = timeparms.to_retries;
402 /* create transport and client */
403 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
405 dprintk("%s: cannot create RPC transport. Error = %ld\n",
406 __FUNCTION__, PTR_ERR(xprt));
407 return (struct rpc_clnt *)xprt;
409 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
410 server->rpc_ops->version, data->pseudoflavor);
412 dprintk("%s: cannot create RPC client. Error = %ld\n",
413 __FUNCTION__, PTR_ERR(xprt));
418 clnt->cl_softrtry = 1;
427 * The way this works is that the mount process passes a structure
428 * in the data argument which contains the server's IP address
429 * and the root file handle obtained from the server's mount
430 * daemon. We stash these away in the private superblock fields.
433 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
435 struct nfs_server *server;
436 rpc_authflavor_t authflavor;
439 sb->s_blocksize_bits = 0;
442 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
444 server->rsize = nfs_block_size(data->rsize, NULL);
446 server->wsize = nfs_block_size(data->wsize, NULL);
447 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
449 server->acregmin = data->acregmin*HZ;
450 server->acregmax = data->acregmax*HZ;
451 server->acdirmin = data->acdirmin*HZ;
452 server->acdirmax = data->acdirmax*HZ;
454 /* Start lockd here, before we might error out */
455 if (!(server->flags & NFS_MOUNT_NONLM))
458 server->namelen = data->namlen;
459 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
460 if (!server->hostname)
462 strcpy(server->hostname, data->hostname);
464 /* Check NFS protocol revision and initialize RPC op vector
465 * and file handle pool. */
467 if (server->flags & NFS_MOUNT_VER3) {
468 server->rpc_ops = &nfs_v3_clientops;
469 server->caps |= NFS_CAP_READDIRPLUS;
471 server->rpc_ops = &nfs_v2_clientops;
474 server->rpc_ops = &nfs_v2_clientops;
477 /* Fill in pseudoflavor for mount version < 5 */
478 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
479 data->pseudoflavor = RPC_AUTH_UNIX;
480 authflavor = data->pseudoflavor; /* save for sb_init() */
481 /* XXX maybe we want to add a server->pseudoflavor field */
483 /* Create RPC client handles */
484 server->client = nfs_create_client(server, data);
485 if (IS_ERR(server->client))
486 return PTR_ERR(server->client);
487 /* RFC 2623, sec 2.3.2 */
488 if (authflavor != RPC_AUTH_UNIX) {
489 struct rpc_auth *auth;
491 server->client_sys = rpc_clone_client(server->client);
492 if (IS_ERR(server->client_sys))
493 return PTR_ERR(server->client_sys);
494 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
496 return PTR_ERR(auth);
498 atomic_inc(&server->client->cl_count);
499 server->client_sys = server->client;
501 if (server->flags & NFS_MOUNT_VER3) {
502 #ifdef CONFIG_NFS_V3_ACL
503 if (!(server->flags & NFS_MOUNT_NOACL)) {
504 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
505 /* No errors! Assume that Sun nfsacls are supported */
506 if (!IS_ERR(server->client_acl))
507 server->caps |= NFS_CAP_ACLS;
510 server->flags &= ~NFS_MOUNT_NOACL;
511 #endif /* CONFIG_NFS_V3_ACL */
513 * The VFS shouldn't apply the umask to mode bits. We will
514 * do so ourselves when necessary.
516 sb->s_flags |= MS_POSIXACL;
517 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
518 server->namelen = NFS3_MAXNAMLEN;
521 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
522 server->namelen = NFS2_MAXNAMLEN;
525 sb->s_op = &nfs_sops;
526 return nfs_sb_init(sb, authflavor);
530 nfs_statfs(struct super_block *sb, struct kstatfs *buf)
532 struct nfs_server *server = NFS_SB(sb);
533 unsigned char blockbits;
534 unsigned long blockres;
535 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
536 struct nfs_fattr fattr;
537 struct nfs_fsstat res = {
544 error = server->rpc_ops->statfs(server, rootfh, &res);
545 buf->f_type = NFS_SUPER_MAGIC;
550 * Current versions of glibc do not correctly handle the
551 * case where f_frsize != f_bsize. Eventually we want to
552 * report the value of wtmult in this field.
554 buf->f_frsize = sb->s_blocksize;
557 * On most *nix systems, f_blocks, f_bfree, and f_bavail
558 * are reported in units of f_frsize. Linux hasn't had
559 * an f_frsize field in its statfs struct until recently,
560 * thus historically Linux's sys_statfs reports these
561 * fields in units of f_bsize.
563 buf->f_bsize = sb->s_blocksize;
564 blockbits = sb->s_blocksize_bits;
565 blockres = (1 << blockbits) - 1;
566 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
567 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
568 buf->f_bavail = (res.abytes + blockres) >> blockbits;
570 buf->f_files = res.tfiles;
571 buf->f_ffree = res.afiles;
573 buf->f_namelen = server->namelen;
579 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
580 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
585 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
587 static struct proc_nfs_info {
592 { NFS_MOUNT_SOFT, ",soft", ",hard" },
593 { NFS_MOUNT_INTR, ",intr", "" },
594 { NFS_MOUNT_POSIX, ",posix", "" },
595 { NFS_MOUNT_NOCTO, ",nocto", "" },
596 { NFS_MOUNT_NOAC, ",noac", "" },
597 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
598 { NFS_MOUNT_NOACL, ",noacl", "" },
601 struct proc_nfs_info *nfs_infop;
602 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
606 seq_printf(m, ",v%d", nfss->rpc_ops->version);
607 seq_printf(m, ",rsize=%d", nfss->rsize);
608 seq_printf(m, ",wsize=%d", nfss->wsize);
609 if (nfss->acregmin != 3*HZ)
610 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
611 if (nfss->acregmax != 60*HZ)
612 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
613 if (nfss->acdirmin != 30*HZ)
614 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
615 if (nfss->acdirmax != 60*HZ)
616 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
617 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
618 if (nfss->flags & nfs_infop->flag)
619 seq_puts(m, nfs_infop->str);
621 seq_puts(m, nfs_infop->nostr);
623 switch (nfss->client->cl_xprt->prot) {
631 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
634 seq_printf(m, ",proto=%s", proto);
635 seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ);
636 seq_printf(m, ",retrans=%u", nfss->retrans_count);
637 seq_puts(m, ",addr=");
638 seq_escape(m, nfss->hostname, " \t\n\\");
643 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
645 int nfs_sync_mapping(struct address_space *mapping)
649 if (mapping->nrpages == 0)
651 unmap_mapping_range(mapping, 0, 0, 0);
652 ret = filemap_write_and_wait(mapping);
655 ret = nfs_wb_all(mapping->host);
661 * Invalidate the local caches
663 static void nfs_zap_caches_locked(struct inode *inode)
665 struct nfs_inode *nfsi = NFS_I(inode);
666 int mode = inode->i_mode;
668 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
669 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
671 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
672 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
673 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
675 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
678 void nfs_zap_caches(struct inode *inode)
680 spin_lock(&inode->i_lock);
681 nfs_zap_caches_locked(inode);
682 spin_unlock(&inode->i_lock);
685 static void nfs_zap_acl_cache(struct inode *inode)
687 void (*clear_acl_cache)(struct inode *);
689 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
690 if (clear_acl_cache != NULL)
691 clear_acl_cache(inode);
692 spin_lock(&inode->i_lock);
693 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
694 spin_unlock(&inode->i_lock);
698 * Invalidate, but do not unhash, the inode.
699 * NB: must be called with inode->i_lock held!
701 static void nfs_invalidate_inode(struct inode *inode)
703 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
704 nfs_zap_caches_locked(inode);
707 struct nfs_find_desc {
709 struct nfs_fattr *fattr;
713 * In NFSv3 we can have 64bit inode numbers. In order to support
714 * this, and re-exported directories (also seen in NFSv2)
715 * we are forced to allow 2 different inodes to have the same
719 nfs_find_actor(struct inode *inode, void *opaque)
721 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
722 struct nfs_fh *fh = desc->fh;
723 struct nfs_fattr *fattr = desc->fattr;
725 if (NFS_FILEID(inode) != fattr->fileid)
727 if (nfs_compare_fh(NFS_FH(inode), fh))
729 if (is_bad_inode(inode) || NFS_STALE(inode))
735 nfs_init_locked(struct inode *inode, void *opaque)
737 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
738 struct nfs_fattr *fattr = desc->fattr;
740 NFS_FILEID(inode) = fattr->fileid;
741 nfs_copy_fh(NFS_FH(inode), desc->fh);
745 /* Don't use READDIRPLUS on directories that we believe are too large */
746 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
749 * This is our front-end to iget that looks up inodes by file handle
750 * instead of inode number.
753 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
755 struct nfs_find_desc desc = {
759 struct inode *inode = NULL;
762 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
766 printk("NFS: Buggy server - nlink == 0!\n");
770 hash = nfs_fattr_to_ino_t(fattr);
772 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
775 if (inode->i_state & I_NEW) {
776 struct nfs_inode *nfsi = NFS_I(inode);
778 /* We set i_ino for the few things that still rely on it,
782 /* We can't support update_atime(), since the server will reset it */
783 inode->i_flags |= S_NOATIME|S_NOCMTIME;
784 inode->i_mode = fattr->mode;
785 /* Why so? Because we want revalidate for devices/FIFOs, and
786 * that's precisely what we have in nfs_file_inode_operations.
788 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
789 if (S_ISREG(inode->i_mode)) {
790 inode->i_fop = &nfs_file_operations;
791 inode->i_data.a_ops = &nfs_file_aops;
792 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
793 } else if (S_ISDIR(inode->i_mode)) {
794 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
795 inode->i_fop = &nfs_dir_operations;
796 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
797 && fattr->size <= NFS_LIMIT_READDIRPLUS)
798 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
799 } else if (S_ISLNK(inode->i_mode))
800 inode->i_op = &nfs_symlink_inode_operations;
802 init_special_inode(inode, inode->i_mode, fattr->rdev);
804 nfsi->read_cache_jiffies = fattr->time_start;
805 nfsi->last_updated = jiffies;
806 inode->i_atime = fattr->atime;
807 inode->i_mtime = fattr->mtime;
808 inode->i_ctime = fattr->ctime;
809 if (fattr->valid & NFS_ATTR_FATTR_V4)
810 nfsi->change_attr = fattr->change_attr;
811 inode->i_size = nfs_size_to_loff_t(fattr->size);
812 inode->i_nlink = fattr->nlink;
813 inode->i_uid = fattr->uid;
814 inode->i_gid = fattr->gid;
815 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
817 * report the blocks in 512byte units
819 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
820 inode->i_blksize = inode->i_sb->s_blocksize;
822 inode->i_blocks = fattr->du.nfs2.blocks;
823 inode->i_blksize = fattr->du.nfs2.blocksize;
825 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
826 nfsi->attrtimeo_timestamp = jiffies;
827 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
828 nfsi->cache_access.cred = NULL;
830 unlock_new_inode(inode);
832 nfs_refresh_inode(inode, fattr);
833 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
835 (long long)NFS_FILEID(inode),
836 atomic_read(&inode->i_count));
842 printk("nfs_fhget: iget failed\n");
846 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
849 nfs_setattr(struct dentry *dentry, struct iattr *attr)
851 struct inode *inode = dentry->d_inode;
852 struct nfs_fattr fattr;
855 if (attr->ia_valid & ATTR_SIZE) {
856 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
857 attr->ia_valid &= ~ATTR_SIZE;
860 /* Optimization: if the end result is no change, don't RPC */
861 attr->ia_valid &= NFS_VALID_ATTRS;
862 if (attr->ia_valid == 0)
866 nfs_begin_data_update(inode);
867 /* Write all dirty data */
868 filemap_write_and_wait(inode->i_mapping);
871 * Return any delegations if we're going to change ACLs
873 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
874 nfs_inode_return_delegation(inode);
875 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
877 nfs_refresh_inode(inode, &fattr);
878 nfs_end_data_update(inode);
884 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
885 * @inode: pointer to struct inode
886 * @attr: pointer to struct iattr
888 * Note: we do this in the *proc.c in order to ensure that
889 * it works for things like exclusive creates too.
891 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
893 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
894 if ((attr->ia_valid & ATTR_MODE) != 0) {
895 int mode = attr->ia_mode & S_IALLUGO;
896 mode |= inode->i_mode & ~S_IALLUGO;
897 inode->i_mode = mode;
899 if ((attr->ia_valid & ATTR_UID) != 0)
900 inode->i_uid = attr->ia_uid;
901 if ((attr->ia_valid & ATTR_GID) != 0)
902 inode->i_gid = attr->ia_gid;
903 spin_lock(&inode->i_lock);
904 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
905 spin_unlock(&inode->i_lock);
907 if ((attr->ia_valid & ATTR_SIZE) != 0) {
908 inode->i_size = attr->ia_size;
909 vmtruncate(inode, attr->ia_size);
913 static int nfs_wait_schedule(void *word)
915 if (signal_pending(current))
922 * Wait for the inode to get unlocked.
924 static int nfs_wait_on_inode(struct inode *inode)
926 struct rpc_clnt *clnt = NFS_CLIENT(inode);
927 struct nfs_inode *nfsi = NFS_I(inode);
931 rpc_clnt_sigmask(clnt, &oldmask);
932 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
933 nfs_wait_schedule, TASK_INTERRUPTIBLE);
934 rpc_clnt_sigunmask(clnt, &oldmask);
939 static void nfs_wake_up_inode(struct inode *inode)
941 struct nfs_inode *nfsi = NFS_I(inode);
943 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
944 smp_mb__after_clear_bit();
945 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
948 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
950 struct inode *inode = dentry->d_inode;
951 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
954 /* Flush out writes to the server in order to update c/mtime */
955 nfs_sync_inode(inode, 0, 0, FLUSH_WAIT|FLUSH_NOCOMMIT);
958 * We may force a getattr if the user cares about atime.
960 * Note that we only have to check the vfsmount flags here:
961 * - NFS always sets S_NOATIME by so checking it would give a
963 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
964 * no point in checking those.
966 if ((mnt->mnt_flags & MNT_NOATIME) ||
967 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
971 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
973 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
975 generic_fillattr(inode, stat);
979 static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
981 struct nfs_open_context *ctx;
983 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
985 atomic_set(&ctx->count, 1);
986 ctx->dentry = dget(dentry);
987 ctx->vfsmnt = mntget(mnt);
988 ctx->cred = get_rpccred(cred);
990 ctx->lockowner = current->files;
997 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1000 atomic_inc(&ctx->count);
1004 void put_nfs_open_context(struct nfs_open_context *ctx)
1006 if (atomic_dec_and_test(&ctx->count)) {
1007 if (!list_empty(&ctx->list)) {
1008 struct inode *inode = ctx->dentry->d_inode;
1009 spin_lock(&inode->i_lock);
1010 list_del(&ctx->list);
1011 spin_unlock(&inode->i_lock);
1013 if (ctx->state != NULL)
1014 nfs4_close_state(ctx->state, ctx->mode);
1015 if (ctx->cred != NULL)
1016 put_rpccred(ctx->cred);
1018 mntput(ctx->vfsmnt);
1024 * Ensure that mmap has a recent RPC credential for use when writing out
1027 static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1029 struct inode *inode = filp->f_dentry->d_inode;
1030 struct nfs_inode *nfsi = NFS_I(inode);
1032 filp->private_data = get_nfs_open_context(ctx);
1033 spin_lock(&inode->i_lock);
1034 list_add(&ctx->list, &nfsi->open_files);
1035 spin_unlock(&inode->i_lock);
1039 * Given an inode, search for an open context with the desired characteristics
1041 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
1043 struct nfs_inode *nfsi = NFS_I(inode);
1044 struct nfs_open_context *pos, *ctx = NULL;
1046 spin_lock(&inode->i_lock);
1047 list_for_each_entry(pos, &nfsi->open_files, list) {
1048 if (cred != NULL && pos->cred != cred)
1050 if ((pos->mode & mode) == mode) {
1051 ctx = get_nfs_open_context(pos);
1055 spin_unlock(&inode->i_lock);
1059 static void nfs_file_clear_open_context(struct file *filp)
1061 struct inode *inode = filp->f_dentry->d_inode;
1062 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
1065 filp->private_data = NULL;
1066 spin_lock(&inode->i_lock);
1067 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1068 spin_unlock(&inode->i_lock);
1069 put_nfs_open_context(ctx);
1074 * These allocate and release file read/write context information.
1076 int nfs_open(struct inode *inode, struct file *filp)
1078 struct nfs_open_context *ctx;
1079 struct rpc_cred *cred;
1081 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1083 return PTR_ERR(cred);
1084 ctx = alloc_nfs_open_context(filp->f_vfsmnt, filp->f_dentry, cred);
1088 ctx->mode = filp->f_mode;
1089 nfs_file_set_open_context(filp, ctx);
1090 put_nfs_open_context(ctx);
1094 int nfs_release(struct inode *inode, struct file *filp)
1096 nfs_file_clear_open_context(filp);
1101 * This function is called whenever some part of NFS notices that
1102 * the cached attributes have to be refreshed.
1105 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1107 int status = -ESTALE;
1108 struct nfs_fattr fattr;
1109 struct nfs_inode *nfsi = NFS_I(inode);
1111 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1112 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1115 if (!inode || is_bad_inode(inode))
1117 if (NFS_STALE(inode))
1120 status = nfs_wait_on_inode(inode);
1123 if (NFS_STALE(inode)) {
1125 /* Do we trust the cached ESTALE? */
1126 if (NFS_ATTRTIMEO(inode) != 0) {
1127 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
1134 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1136 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1138 (long long)NFS_FILEID(inode), status);
1139 if (status == -ESTALE) {
1140 nfs_zap_caches(inode);
1141 if (!S_ISDIR(inode->i_mode))
1142 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1147 spin_lock(&inode->i_lock);
1148 status = nfs_update_inode(inode, &fattr);
1150 spin_unlock(&inode->i_lock);
1151 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1153 (long long)NFS_FILEID(inode), status);
1156 spin_unlock(&inode->i_lock);
1158 nfs_revalidate_mapping(inode, inode->i_mapping);
1160 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1161 nfs_zap_acl_cache(inode);
1163 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1165 (long long)NFS_FILEID(inode));
1168 nfs_wake_up_inode(inode);
1175 int nfs_attribute_timeout(struct inode *inode)
1177 struct nfs_inode *nfsi = NFS_I(inode);
1179 if (nfs_have_delegation(inode, FMODE_READ))
1181 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1185 * nfs_revalidate_inode - Revalidate the inode attributes
1186 * @server - pointer to nfs_server struct
1187 * @inode - pointer to inode struct
1189 * Updates inode attribute information by retrieving the data from the server.
1191 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1193 if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1194 && !nfs_attribute_timeout(inode))
1195 return NFS_STALE(inode) ? -ESTALE : 0;
1196 return __nfs_revalidate_inode(server, inode);
1200 * nfs_revalidate_mapping - Revalidate the pagecache
1201 * @inode - pointer to host inode
1202 * @mapping - pointer to mapping
1204 void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1206 struct nfs_inode *nfsi = NFS_I(inode);
1208 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
1209 if (S_ISREG(inode->i_mode))
1210 nfs_sync_mapping(mapping);
1211 invalidate_inode_pages2(mapping);
1213 spin_lock(&inode->i_lock);
1214 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1215 if (S_ISDIR(inode->i_mode)) {
1216 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1217 /* This ensures we revalidate child dentries */
1218 nfsi->cache_change_attribute = jiffies;
1220 spin_unlock(&inode->i_lock);
1222 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1224 (long long)NFS_FILEID(inode));
1229 * nfs_begin_data_update
1230 * @inode - pointer to inode
1231 * Declare that a set of operations will update file data on the server
1233 void nfs_begin_data_update(struct inode *inode)
1235 atomic_inc(&NFS_I(inode)->data_updates);
1239 * nfs_end_data_update
1240 * @inode - pointer to inode
1241 * Declare end of the operations that will update file data
1242 * This will mark the inode as immediately needing revalidation
1243 * of its attribute cache.
1245 void nfs_end_data_update(struct inode *inode)
1247 struct nfs_inode *nfsi = NFS_I(inode);
1249 if (!nfs_have_delegation(inode, FMODE_READ)) {
1250 /* Directories and symlinks: invalidate page cache */
1251 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
1252 spin_lock(&inode->i_lock);
1253 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1254 spin_unlock(&inode->i_lock);
1257 nfsi->cache_change_attribute = jiffies;
1258 atomic_dec(&nfsi->data_updates);
1261 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1263 struct nfs_inode *nfsi = NFS_I(inode);
1265 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1266 && nfsi->change_attr == fattr->pre_change_attr) {
1267 nfsi->change_attr = fattr->change_attr;
1268 nfsi->cache_change_attribute = jiffies;
1271 /* If we have atomic WCC data, we may update some attributes */
1272 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1273 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1274 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1275 nfsi->cache_change_attribute = jiffies;
1277 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1278 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1279 nfsi->cache_change_attribute = jiffies;
1281 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
1282 inode->i_size = fattr->size;
1283 nfsi->cache_change_attribute = jiffies;
1289 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1290 * @inode - pointer to inode
1291 * @fattr - updated attributes
1293 * Verifies the attribute cache. If we have just changed the attributes,
1294 * so that fattr carries weak cache consistency data, then it may
1295 * also update the ctime/mtime/change_attribute.
1297 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1299 struct nfs_inode *nfsi = NFS_I(inode);
1300 loff_t cur_size, new_isize;
1304 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1307 /* Has the inode gone and changed behind our back? */
1308 if (nfsi->fileid != fattr->fileid
1309 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1313 /* Are we in the process of updating data on the server? */
1314 data_unstable = nfs_caches_unstable(inode);
1316 /* Do atomic weak cache consistency updates */
1317 nfs_wcc_update_inode(inode, fattr);
1319 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0) {
1320 if (nfsi->change_attr == fattr->change_attr)
1322 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1324 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1327 /* Verify a few of the more important attributes */
1328 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1329 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1331 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1334 cur_size = i_size_read(inode);
1335 new_isize = nfs_size_to_loff_t(fattr->size);
1336 if (cur_size != new_isize && nfsi->npages == 0)
1337 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1339 /* Have any file permissions changed? */
1340 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1341 || inode->i_uid != fattr->uid
1342 || inode->i_gid != fattr->gid)
1343 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1345 /* Has the link count changed? */
1346 if (inode->i_nlink != fattr->nlink)
1347 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1350 if (!timespec_equal(&inode->i_atime, &fattr->atime))
1351 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
1353 nfsi->read_cache_jiffies = fattr->time_start;
1358 * nfs_refresh_inode - try to update the inode attribute cache
1359 * @inode - pointer to inode
1360 * @fattr - updated attributes
1362 * Check that an RPC call that returned attributes has not overlapped with
1363 * other recent updates of the inode metadata, then decide whether it is
1364 * safe to do a full update of the inode attributes, or whether just to
1365 * call nfs_check_inode_attributes.
1367 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1369 struct nfs_inode *nfsi = NFS_I(inode);
1372 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1374 spin_lock(&inode->i_lock);
1375 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1376 if (time_after(fattr->time_start, nfsi->last_updated))
1377 status = nfs_update_inode(inode, fattr);
1379 status = nfs_check_inode_attributes(inode, fattr);
1381 spin_unlock(&inode->i_lock);
1386 * nfs_post_op_update_inode - try to update the inode attribute cache
1387 * @inode - pointer to inode
1388 * @fattr - updated attributes
1390 * After an operation that has changed the inode metadata, mark the
1391 * attribute cache as being invalid, then try to update it.
1393 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1395 struct nfs_inode *nfsi = NFS_I(inode);
1398 spin_lock(&inode->i_lock);
1399 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
1400 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
1403 status = nfs_update_inode(inode, fattr);
1405 spin_unlock(&inode->i_lock);
1410 * Many nfs protocol calls return the new file attributes after
1411 * an operation. Here we update the inode to reflect the state
1412 * of the server's inode.
1414 * This is a bit tricky because we have to make sure all dirty pages
1415 * have been sent off to the server before calling invalidate_inode_pages.
1416 * To make sure no other process adds more write requests while we try
1417 * our best to flush them, we make them sleep during the attribute refresh.
1419 * A very similar scenario holds for the dir cache.
1421 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1423 struct nfs_inode *nfsi = NFS_I(inode);
1424 loff_t cur_isize, new_isize;
1425 unsigned int invalid = 0;
1428 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1429 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1430 atomic_read(&inode->i_count), fattr->valid);
1432 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1435 if (nfsi->fileid != fattr->fileid)
1439 * Make sure the inode's type hasn't changed.
1441 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1445 * Update the read time so we don't revalidate too often.
1447 nfsi->read_cache_jiffies = fattr->time_start;
1448 nfsi->last_updated = jiffies;
1450 /* Are we racing with known updates of the metadata on the server? */
1451 data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
1453 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1455 /* Do atomic weak cache consistency updates */
1456 nfs_wcc_update_inode(inode, fattr);
1458 /* Check if our cached file size is stale */
1459 new_isize = nfs_size_to_loff_t(fattr->size);
1460 cur_isize = i_size_read(inode);
1461 if (new_isize != cur_isize) {
1462 /* Do we perhaps have any outstanding writes? */
1463 if (nfsi->npages == 0) {
1464 /* No, but did we race with nfs_end_data_update()? */
1466 inode->i_size = new_isize;
1467 invalid |= NFS_INO_INVALID_DATA;
1469 invalid |= NFS_INO_INVALID_ATTR;
1470 } else if (new_isize > cur_isize) {
1471 inode->i_size = new_isize;
1472 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1474 nfsi->cache_change_attribute = jiffies;
1475 dprintk("NFS: isize change on server for file %s/%ld\n",
1476 inode->i_sb->s_id, inode->i_ino);
1479 /* Check if the mtime agrees */
1480 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1481 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1482 dprintk("NFS: mtime change on server for file %s/%ld\n",
1483 inode->i_sb->s_id, inode->i_ino);
1484 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1485 nfsi->cache_change_attribute = jiffies;
1488 /* If ctime has changed we should definitely clear access+acl caches */
1489 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1490 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1491 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1492 nfsi->cache_change_attribute = jiffies;
1494 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1496 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1497 inode->i_uid != fattr->uid ||
1498 inode->i_gid != fattr->gid)
1499 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1501 inode->i_mode = fattr->mode;
1502 inode->i_nlink = fattr->nlink;
1503 inode->i_uid = fattr->uid;
1504 inode->i_gid = fattr->gid;
1506 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1508 * report the blocks in 512byte units
1510 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1511 inode->i_blksize = inode->i_sb->s_blocksize;
1513 inode->i_blocks = fattr->du.nfs2.blocks;
1514 inode->i_blksize = fattr->du.nfs2.blocksize;
1517 if ((fattr->valid & NFS_ATTR_FATTR_V4)) {
1518 if (nfsi->change_attr != fattr->change_attr) {
1519 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1520 inode->i_sb->s_id, inode->i_ino);
1521 nfsi->change_attr = fattr->change_attr;
1522 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1523 nfsi->cache_change_attribute = jiffies;
1525 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA);
1528 /* Update attrtimeo value if we're out of the unstable period */
1529 if (invalid & NFS_INO_INVALID_ATTR) {
1530 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1531 nfsi->attrtimeo_timestamp = jiffies;
1532 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1533 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1534 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1535 nfsi->attrtimeo_timestamp = jiffies;
1537 /* Don't invalidate the data if we were to blame */
1538 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1539 || S_ISLNK(inode->i_mode)))
1540 invalid &= ~NFS_INO_INVALID_DATA;
1542 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
1543 if (!nfs_have_delegation(inode, FMODE_READ))
1544 nfsi->cache_validity |= invalid;
1549 * Big trouble! The inode has become a different object.
1552 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1553 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1557 * No need to worry about unhashing the dentry, as the
1558 * lookup validation will know that the inode is bad.
1559 * (But we fall through to invalidate the caches.)
1561 nfs_invalidate_inode(inode);
1565 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1566 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1567 NFS_SERVER(inode)->hostname, inode->i_sb->s_id,
1568 (long long)nfsi->fileid, (long long)fattr->fileid);
1573 * File system information
1576 static int nfs_set_super(struct super_block *s, void *data)
1578 s->s_fs_info = data;
1579 return set_anon_super(s, data);
1582 static int nfs_compare_super(struct super_block *sb, void *data)
1584 struct nfs_server *server = data;
1585 struct nfs_server *old = NFS_SB(sb);
1587 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1589 if (old->addr.sin_port != server->addr.sin_port)
1591 return !nfs_compare_fh(&old->fh, &server->fh);
1594 static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1595 int flags, const char *dev_name, void *raw_data)
1598 struct nfs_server *server = NULL;
1599 struct super_block *s;
1600 struct nfs_fh *root;
1601 struct nfs_mount_data *data = raw_data;
1603 s = ERR_PTR(-EINVAL);
1605 dprintk("%s: missing data argument\n", __FUNCTION__);
1608 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1609 dprintk("%s: bad mount version\n", __FUNCTION__);
1612 switch (data->version) {
1618 if (data->flags & NFS_MOUNT_VER3) {
1619 dprintk("%s: mount structure version %d does not support NFSv3\n",
1624 data->root.size = NFS2_FHSIZE;
1625 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1627 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1628 dprintk("%s: mount structure version %d does not support strong security\n",
1634 memset(data->context, 0, sizeof(data->context));
1636 #ifndef CONFIG_NFS_V3
1637 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1638 s = ERR_PTR(-EPROTONOSUPPORT);
1639 if (data->flags & NFS_MOUNT_VER3) {
1640 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1643 #endif /* CONFIG_NFS_V3 */
1645 s = ERR_PTR(-ENOMEM);
1646 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1649 /* Zero out the NFS state stuff */
1650 init_nfsv4_state(server);
1651 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1654 if (data->flags & NFS_MOUNT_VER3)
1655 root->size = data->root.size;
1657 root->size = NFS2_FHSIZE;
1658 s = ERR_PTR(-EINVAL);
1659 if (root->size > sizeof(root->data)) {
1660 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1663 memcpy(root->data, data->root.data, root->size);
1665 /* We now require that the mount process passes the remote address */
1666 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1667 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1668 dprintk("%s: mount program didn't pass remote address!\n",
1673 /* Fire up rpciod if not yet running */
1674 s = ERR_PTR(rpciod_up());
1676 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1677 __FUNCTION__, PTR_ERR(s));
1681 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1682 if (IS_ERR(s) || s->s_root)
1683 goto out_rpciod_down;
1687 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1689 up_write(&s->s_umount);
1690 deactivate_super(s);
1691 return ERR_PTR(error);
1693 s->s_flags |= MS_ACTIVE;
1702 static void nfs_kill_super(struct super_block *s)
1704 struct nfs_server *server = NFS_SB(s);
1708 if (!IS_ERR(server->client))
1709 rpc_shutdown_client(server->client);
1710 if (!IS_ERR(server->client_sys))
1711 rpc_shutdown_client(server->client_sys);
1712 if (!IS_ERR(server->client_acl))
1713 rpc_shutdown_client(server->client_acl);
1715 if (!(server->flags & NFS_MOUNT_NONLM))
1716 lockd_down(); /* release rpc.lockd */
1718 rpciod_down(); /* release rpciod */
1720 kfree(server->hostname);
1724 static struct file_system_type nfs_fs_type = {
1725 .owner = THIS_MODULE,
1727 .get_sb = nfs_get_sb,
1728 .kill_sb = nfs_kill_super,
1729 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1732 #ifdef CONFIG_NFS_V4
1734 static void nfs4_clear_inode(struct inode *);
1737 static struct super_operations nfs4_sops = {
1738 .alloc_inode = nfs_alloc_inode,
1739 .destroy_inode = nfs_destroy_inode,
1740 .write_inode = nfs_write_inode,
1741 .delete_inode = nfs_delete_inode,
1742 .statfs = nfs_statfs,
1743 .clear_inode = nfs4_clear_inode,
1744 .umount_begin = nfs_umount_begin,
1745 .show_options = nfs_show_options,
1749 * Clean out any remaining NFSv4 state that might be left over due
1750 * to open() calls that passed nfs_atomic_lookup, but failed to call
1753 static void nfs4_clear_inode(struct inode *inode)
1755 struct nfs_inode *nfsi = NFS_I(inode);
1757 /* If we are holding a delegation, return it! */
1758 nfs_inode_return_delegation(inode);
1759 /* First call standard NFS clear_inode() code */
1760 nfs_clear_inode(inode);
1761 /* Now clear out any remaining state */
1762 while (!list_empty(&nfsi->open_states)) {
1763 struct nfs4_state *state;
1765 state = list_entry(nfsi->open_states.next,
1768 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1771 (long long)NFS_FILEID(inode),
1773 BUG_ON(atomic_read(&state->count) != 1);
1774 nfs4_close_state(state, state->state);
1779 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1781 struct nfs_server *server;
1782 struct nfs4_client *clp = NULL;
1783 struct rpc_xprt *xprt = NULL;
1784 struct rpc_clnt *clnt = NULL;
1785 struct rpc_timeout timeparms;
1786 rpc_authflavor_t authflavour;
1789 sb->s_blocksize_bits = 0;
1790 sb->s_blocksize = 0;
1791 server = NFS_SB(sb);
1792 if (data->rsize != 0)
1793 server->rsize = nfs_block_size(data->rsize, NULL);
1794 if (data->wsize != 0)
1795 server->wsize = nfs_block_size(data->wsize, NULL);
1796 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1797 server->caps = NFS_CAP_ATOMIC_OPEN;
1799 server->acregmin = data->acregmin*HZ;
1800 server->acregmax = data->acregmax*HZ;
1801 server->acdirmin = data->acdirmin*HZ;
1802 server->acdirmax = data->acdirmax*HZ;
1804 server->rpc_ops = &nfs_v4_clientops;
1806 nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1808 server->retrans_timeo = timeparms.to_initval;
1809 server->retrans_count = timeparms.to_retries;
1811 clp = nfs4_get_client(&server->addr.sin_addr);
1813 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1817 /* Now create transport and client */
1818 authflavour = RPC_AUTH_UNIX;
1819 if (data->auth_flavourlen != 0) {
1820 if (data->auth_flavourlen != 1) {
1821 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1822 __FUNCTION__, data->auth_flavourlen);
1826 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1832 down_write(&clp->cl_sem);
1833 if (IS_ERR(clp->cl_rpcclient)) {
1834 xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
1836 up_write(&clp->cl_sem);
1837 err = PTR_ERR(xprt);
1838 dprintk("%s: cannot create RPC transport. Error = %d\n",
1842 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1843 server->rpc_ops->version, authflavour);
1845 up_write(&clp->cl_sem);
1846 err = PTR_ERR(clnt);
1847 dprintk("%s: cannot create RPC client. Error = %d\n",
1852 clnt->cl_softrtry = 1;
1853 clp->cl_rpcclient = clnt;
1854 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1857 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1858 clnt = rpc_clone_client(clp->cl_rpcclient);
1860 server->nfs4_state = clp;
1861 up_write(&clp->cl_sem);
1865 err = PTR_ERR(clnt);
1866 dprintk("%s: cannot create RPC client. Error = %d\n",
1871 server->client = clnt;
1873 if (server->nfs4_state->cl_idmap == NULL) {
1874 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1878 if (clnt->cl_auth->au_flavor != authflavour) {
1879 struct rpc_auth *auth;
1881 auth = rpcauth_create(authflavour, clnt);
1883 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1884 return PTR_ERR(auth);
1888 sb->s_time_gran = 1;
1890 sb->s_op = &nfs4_sops;
1891 err = nfs_sb_init(sb, authflavour);
1896 nfs4_put_client(clp);
1900 static int nfs4_compare_super(struct super_block *sb, void *data)
1902 struct nfs_server *server = data;
1903 struct nfs_server *old = NFS_SB(sb);
1905 if (strcmp(server->hostname, old->hostname) != 0)
1907 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1913 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1918 return ERR_PTR(-EINVAL);
1919 if (src->len < maxlen)
1922 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1924 return ERR_PTR(-ENOMEM);
1926 if (copy_from_user(dst, src->data, maxlen)) {
1928 return ERR_PTR(-EFAULT);
1934 static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1935 int flags, const char *dev_name, void *raw_data)
1938 struct nfs_server *server;
1939 struct super_block *s;
1940 struct nfs4_mount_data *data = raw_data;
1944 dprintk("%s: missing data argument\n", __FUNCTION__);
1945 return ERR_PTR(-EINVAL);
1947 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1948 dprintk("%s: bad mount version\n", __FUNCTION__);
1949 return ERR_PTR(-EINVAL);
1952 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
1954 return ERR_PTR(-ENOMEM);
1955 /* Zero out the NFS state stuff */
1956 init_nfsv4_state(server);
1957 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1959 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1962 server->hostname = p;
1964 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1967 server->mnt_path = p;
1969 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1970 sizeof(server->ip_addr) - 1);
1974 /* We now require that the mount process passes the remote address */
1975 if (data->host_addrlen != sizeof(server->addr)) {
1976 s = ERR_PTR(-EINVAL);
1979 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
1980 s = ERR_PTR(-EFAULT);
1983 if (server->addr.sin_family != AF_INET ||
1984 server->addr.sin_addr.s_addr == INADDR_ANY) {
1985 dprintk("%s: mount program didn't pass remote IP address!\n",
1987 s = ERR_PTR(-EINVAL);
1991 /* Fire up rpciod if not yet running */
1992 s = ERR_PTR(rpciod_up());
1994 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1995 __FUNCTION__, PTR_ERR(s));
1999 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
2001 if (IS_ERR(s) || s->s_root)
2006 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
2008 up_write(&s->s_umount);
2009 deactivate_super(s);
2010 return ERR_PTR(error);
2012 s->s_flags |= MS_ACTIVE;
2015 s = (struct super_block *)p;
2017 kfree(server->mnt_path);
2018 kfree(server->hostname);
2023 static void nfs4_kill_super(struct super_block *sb)
2025 struct nfs_server *server = NFS_SB(sb);
2027 nfs_return_all_delegations(sb);
2028 kill_anon_super(sb);
2030 nfs4_renewd_prepare_shutdown(server);
2032 if (server->client != NULL && !IS_ERR(server->client))
2033 rpc_shutdown_client(server->client);
2035 destroy_nfsv4_state(server);
2039 kfree(server->hostname);
2043 static struct file_system_type nfs4_fs_type = {
2044 .owner = THIS_MODULE,
2046 .get_sb = nfs4_get_sb,
2047 .kill_sb = nfs4_kill_super,
2048 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
2051 static const int nfs_set_port_min = 0;
2052 static const int nfs_set_port_max = 65535;
2053 static int param_set_port(const char *val, struct kernel_param *kp)
2056 int num = simple_strtol(val, &endp, 0);
2057 if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
2059 *((int *)kp->arg) = num;
2063 module_param_call(callback_tcpport, param_set_port, param_get_int,
2064 &nfs_callback_set_tcpport, 0644);
2066 static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
2069 int num = simple_strtol(val, &endp, 0);
2071 if (endp == val || *endp || num < 0 || jif < num)
2073 *((int *)kp->arg) = jif;
2077 module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
2078 &nfs_idmap_cache_timeout, 0644);
2080 #define nfs4_init_once(nfsi) \
2082 INIT_LIST_HEAD(&(nfsi)->open_states); \
2083 nfsi->delegation = NULL; \
2084 nfsi->delegation_state = 0; \
2085 init_rwsem(&nfsi->rwsem); \
2088 static inline int register_nfs4fs(void)
2092 ret = nfs_register_sysctl();
2095 ret = register_filesystem(&nfs4_fs_type);
2097 nfs_unregister_sysctl();
2101 static inline void unregister_nfs4fs(void)
2103 unregister_filesystem(&nfs4_fs_type);
2104 nfs_unregister_sysctl();
2107 #define nfs4_init_once(nfsi) \
2109 #define register_nfs4fs() (0)
2110 #define unregister_nfs4fs()
2113 extern int nfs_init_nfspagecache(void);
2114 extern void nfs_destroy_nfspagecache(void);
2115 extern int nfs_init_readpagecache(void);
2116 extern void nfs_destroy_readpagecache(void);
2117 extern int nfs_init_writepagecache(void);
2118 extern void nfs_destroy_writepagecache(void);
2119 #ifdef CONFIG_NFS_DIRECTIO
2120 extern int nfs_init_directcache(void);
2121 extern void nfs_destroy_directcache(void);
2124 static kmem_cache_t * nfs_inode_cachep;
2126 static struct inode *nfs_alloc_inode(struct super_block *sb)
2128 struct nfs_inode *nfsi;
2129 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
2133 nfsi->cache_validity = 0UL;
2134 nfsi->cache_change_attribute = jiffies;
2135 #ifdef CONFIG_NFS_V3_ACL
2136 nfsi->acl_access = ERR_PTR(-EAGAIN);
2137 nfsi->acl_default = ERR_PTR(-EAGAIN);
2139 #ifdef CONFIG_NFS_V4
2140 nfsi->nfs4_acl = NULL;
2141 #endif /* CONFIG_NFS_V4 */
2142 return &nfsi->vfs_inode;
2145 static void nfs_destroy_inode(struct inode *inode)
2147 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2150 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
2152 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2154 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2155 SLAB_CTOR_CONSTRUCTOR) {
2156 inode_init_once(&nfsi->vfs_inode);
2157 spin_lock_init(&nfsi->req_lock);
2158 INIT_LIST_HEAD(&nfsi->dirty);
2159 INIT_LIST_HEAD(&nfsi->commit);
2160 INIT_LIST_HEAD(&nfsi->open_files);
2161 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
2162 atomic_set(&nfsi->data_updates, 0);
2166 nfs4_init_once(nfsi);
2170 static int nfs_init_inodecache(void)
2172 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2173 sizeof(struct nfs_inode),
2174 0, SLAB_RECLAIM_ACCOUNT,
2176 if (nfs_inode_cachep == NULL)
2182 static void nfs_destroy_inodecache(void)
2184 if (kmem_cache_destroy(nfs_inode_cachep))
2185 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
2191 static int __init init_nfs_fs(void)
2195 err = nfs_init_nfspagecache();
2199 err = nfs_init_inodecache();
2203 err = nfs_init_readpagecache();
2207 err = nfs_init_writepagecache();
2211 #ifdef CONFIG_NFS_DIRECTIO
2212 err = nfs_init_directcache();
2217 #ifdef CONFIG_PROC_FS
2218 rpc_proc_register(&nfs_rpcstat);
2220 err = register_filesystem(&nfs_fs_type);
2223 if ((err = register_nfs4fs()) != 0)
2227 #ifdef CONFIG_PROC_FS
2228 rpc_proc_unregister("nfs");
2230 #ifdef CONFIG_NFS_DIRECTIO
2231 nfs_destroy_directcache();
2234 nfs_destroy_writepagecache();
2236 nfs_destroy_readpagecache();
2238 nfs_destroy_inodecache();
2240 nfs_destroy_nfspagecache();
2245 static void __exit exit_nfs_fs(void)
2247 #ifdef CONFIG_NFS_DIRECTIO
2248 nfs_destroy_directcache();
2250 nfs_destroy_writepagecache();
2251 nfs_destroy_readpagecache();
2252 nfs_destroy_inodecache();
2253 nfs_destroy_nfspagecache();
2254 #ifdef CONFIG_PROC_FS
2255 rpc_proc_unregister("nfs");
2257 unregister_filesystem(&nfs_fs_type);
2258 unregister_nfs4fs();
2261 /* Not quite true; I just maintain it */
2262 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2263 MODULE_LICENSE("GPL");
2265 module_init(init_nfs_fs)
2266 module_exit(exit_nfs_fs)