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>
38 #include <linux/vserver/xid.h>
40 #include <asm/system.h>
41 #include <asm/uaccess.h>
45 #include "delegation.h"
47 #define NFSDBG_FACILITY NFSDBG_VFS
48 #define NFS_PARANOIA 1
50 /* Maximum number of readahead requests
51 * FIXME: this should really be a sysctl so that users may tune it to suit
52 * their needs. People that do NFS over a slow network, might for
53 * instance want to reduce it to something closer to 1 for improved
54 * interactive response.
56 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
58 static void nfs_invalidate_inode(struct inode *);
59 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
61 static struct inode *nfs_alloc_inode(struct super_block *sb);
62 static void nfs_destroy_inode(struct inode *);
63 static int nfs_write_inode(struct inode *,int);
64 static void nfs_delete_inode(struct inode *);
65 static void nfs_clear_inode(struct inode *);
66 static void nfs_umount_begin(struct super_block *);
67 static int nfs_statfs(struct super_block *, struct kstatfs *);
68 static int nfs_show_options(struct seq_file *, struct vfsmount *);
69 static void nfs_zap_acl_cache(struct inode *);
71 static struct rpc_program nfs_program;
73 static struct super_operations nfs_sops = {
74 .alloc_inode = nfs_alloc_inode,
75 .destroy_inode = nfs_destroy_inode,
76 .write_inode = nfs_write_inode,
77 .delete_inode = nfs_delete_inode,
79 .clear_inode = nfs_clear_inode,
80 .umount_begin = nfs_umount_begin,
81 .show_options = nfs_show_options,
87 static struct rpc_stat nfs_rpcstat = {
88 .program = &nfs_program
90 static struct rpc_version * nfs_version[] = {
94 #if defined(CONFIG_NFS_V3)
96 #elif defined(CONFIG_NFS_V4)
99 #if defined(CONFIG_NFS_V4)
104 static struct rpc_program nfs_program = {
106 .number = NFS_PROGRAM,
107 .nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
108 .version = nfs_version,
109 .stats = &nfs_rpcstat,
110 .pipe_dir_name = "/nfs",
113 #ifdef CONFIG_NFS_V3_ACL
114 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
115 static struct rpc_version * nfsacl_version[] = {
116 [3] = &nfsacl_version3,
119 struct rpc_program nfsacl_program = {
121 .number = NFS_ACL_PROGRAM,
122 .nrvers = sizeof(nfsacl_version) / sizeof(nfsacl_version[0]),
123 .version = nfsacl_version,
124 .stats = &nfsacl_rpcstat,
126 #endif /* CONFIG_NFS_V3_ACL */
128 static inline unsigned long
129 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
131 return nfs_fileid_to_ino_t(fattr->fileid);
135 nfs_write_inode(struct inode *inode, int sync)
137 int flags = sync ? FLUSH_WAIT : 0;
140 ret = nfs_commit_inode(inode, flags);
147 nfs_delete_inode(struct inode * inode)
149 dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
151 truncate_inode_pages(&inode->i_data, 0);
155 * The following should never happen...
157 if (nfs_have_writebacks(inode)) {
158 printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
165 nfs_clear_inode(struct inode *inode)
167 struct nfs_inode *nfsi = NFS_I(inode);
168 struct rpc_cred *cred;
171 BUG_ON (!list_empty(&nfsi->open_files));
172 nfs_zap_acl_cache(inode);
173 cred = nfsi->cache_access.cred;
176 BUG_ON(atomic_read(&nfsi->data_updates) != 0);
180 nfs_umount_begin(struct super_block *sb)
182 struct rpc_clnt *rpc = NFS_SB(sb)->client;
184 /* -EIO all pending I/O */
186 rpc_killall_tasks(rpc);
187 rpc = NFS_SB(sb)->client_acl;
189 rpc_killall_tasks(rpc);
193 static inline unsigned long
194 nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
196 /* make sure blocksize is a power of two */
197 if ((bsize & (bsize - 1)) || nrbitsp) {
198 unsigned char nrbits;
200 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
211 * Calculate the number of 512byte blocks used.
213 static inline unsigned long
214 nfs_calc_block_size(u64 tsize)
216 loff_t used = (tsize + 511) >> 9;
217 return (used > ULONG_MAX) ? ULONG_MAX : used;
221 * Compute and set NFS server blocksize
223 static inline unsigned long
224 nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
226 if (bsize < NFS_MIN_FILE_IO_SIZE)
227 bsize = NFS_DEF_FILE_IO_SIZE;
228 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
229 bsize = NFS_MAX_FILE_IO_SIZE;
231 return nfs_block_bits(bsize, nrbitsp);
235 * Obtain the root inode of the file system.
237 static struct inode *
238 nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
240 struct nfs_server *server = NFS_SB(sb);
244 error = server->rpc_ops->getroot(server, rootfh, fsinfo);
246 dprintk("nfs_get_root: getattr error = %d\n", -error);
247 return ERR_PTR(error);
250 rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
252 return ERR_PTR(-ENOMEM);
257 * Do NFS version-independent mount processing, and sanity checking
260 nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
262 struct nfs_server *server;
263 struct inode *root_inode;
264 struct nfs_fattr fattr;
265 struct nfs_fsinfo fsinfo = {
268 struct nfs_pathconf pathinfo = {
271 int no_root_error = 0;
272 unsigned long max_rpc_payload;
274 /* We probably want something more informative here */
275 snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
279 sb->s_magic = NFS_SUPER_MAGIC;
281 root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
282 /* Did getting the root inode fail? */
283 if (IS_ERR(root_inode)) {
284 no_root_error = PTR_ERR(root_inode);
287 sb->s_root = d_alloc_root(root_inode);
289 no_root_error = -ENOMEM;
292 sb->s_root->d_op = server->rpc_ops->dentry_ops;
294 /* Get some general file system info */
295 if (server->namelen == 0 &&
296 server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
297 server->namelen = pathinfo.max_namelen;
298 /* Work out a lot of parameters */
299 if (server->rsize == 0)
300 server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
301 if (server->wsize == 0)
302 server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
304 if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
305 server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
306 if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
307 server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
309 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
310 if (server->rsize > max_rpc_payload)
311 server->rsize = max_rpc_payload;
312 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
313 server->rsize = NFS_MAX_FILE_IO_SIZE;
314 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
316 if (server->wsize > max_rpc_payload)
317 server->wsize = max_rpc_payload;
318 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
319 server->wsize = NFS_MAX_FILE_IO_SIZE;
320 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
322 if (sb->s_blocksize == 0)
323 sb->s_blocksize = nfs_block_bits(server->wsize,
324 &sb->s_blocksize_bits);
325 server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
327 server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
328 if (server->dtsize > PAGE_CACHE_SIZE)
329 server->dtsize = PAGE_CACHE_SIZE;
330 if (server->dtsize > server->rsize)
331 server->dtsize = server->rsize;
333 if (server->flags & NFS_MOUNT_NOAC) {
334 server->acregmin = server->acregmax = 0;
335 server->acdirmin = server->acdirmax = 0;
336 sb->s_flags |= MS_SYNCHRONOUS;
338 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
340 if (server->flags & NFS_MOUNT_TAGXID)
341 sb->s_flags |= MS_TAGXID;
343 sb->s_maxbytes = fsinfo.maxfilesize;
344 if (sb->s_maxbytes > MAX_LFS_FILESIZE)
345 sb->s_maxbytes = MAX_LFS_FILESIZE;
347 server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
348 server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
349 server->client->cl_tagxid = (server->flags & NFS_MOUNT_TAGXID) ? 1 : 0;
351 /* We're airborne Set socket buffersize */
352 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
354 /* Yargs. It didn't work out. */
356 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
357 if (!IS_ERR(root_inode))
359 return no_root_error;
362 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
364 to->to_initval = timeo * HZ / 10;
365 to->to_retries = retrans;
372 to->to_initval = 60 * HZ;
373 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
374 to->to_initval = NFS_MAX_TCP_TIMEOUT;
375 to->to_increment = to->to_initval;
376 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
377 to->to_exponential = 0;
382 to->to_initval = 11 * HZ / 10;
383 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
384 to->to_initval = NFS_MAX_UDP_TIMEOUT;
385 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
386 to->to_exponential = 1;
392 * Create an RPC client handle.
394 static struct rpc_clnt *
395 nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
397 struct rpc_timeout timeparms;
398 struct rpc_xprt *xprt = NULL;
399 struct rpc_clnt *clnt = NULL;
400 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
402 nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
404 /* create transport and client */
405 xprt = xprt_create_proto(proto, &server->addr, &timeparms);
407 dprintk("%s: cannot create RPC transport. Error = %ld\n",
408 __FUNCTION__, PTR_ERR(xprt));
409 return (struct rpc_clnt *)xprt;
411 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
412 server->rpc_ops->version, data->pseudoflavor);
414 dprintk("%s: cannot create RPC client. Error = %ld\n",
415 __FUNCTION__, PTR_ERR(xprt));
420 clnt->cl_softrtry = 1;
430 * The way this works is that the mount process passes a structure
431 * in the data argument which contains the server's IP address
432 * and the root file handle obtained from the server's mount
433 * daemon. We stash these away in the private superblock fields.
436 nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
438 struct nfs_server *server;
439 rpc_authflavor_t authflavor;
442 sb->s_blocksize_bits = 0;
445 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
447 server->rsize = nfs_block_size(data->rsize, NULL);
449 server->wsize = nfs_block_size(data->wsize, NULL);
450 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
452 server->acregmin = data->acregmin*HZ;
453 server->acregmax = data->acregmax*HZ;
454 server->acdirmin = data->acdirmin*HZ;
455 server->acdirmax = data->acdirmax*HZ;
457 /* Start lockd here, before we might error out */
458 if (!(server->flags & NFS_MOUNT_NONLM))
461 server->namelen = data->namlen;
462 server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
463 if (!server->hostname)
465 strcpy(server->hostname, data->hostname);
467 /* Check NFS protocol revision and initialize RPC op vector
468 * and file handle pool. */
470 if (server->flags & NFS_MOUNT_VER3) {
471 server->rpc_ops = &nfs_v3_clientops;
472 server->caps |= NFS_CAP_READDIRPLUS;
474 server->rpc_ops = &nfs_v2_clientops;
477 server->rpc_ops = &nfs_v2_clientops;
480 /* Fill in pseudoflavor for mount version < 5 */
481 if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
482 data->pseudoflavor = RPC_AUTH_UNIX;
483 authflavor = data->pseudoflavor; /* save for sb_init() */
484 /* XXX maybe we want to add a server->pseudoflavor field */
486 /* Create RPC client handles */
487 server->client = nfs_create_client(server, data);
488 if (IS_ERR(server->client))
489 return PTR_ERR(server->client);
490 /* RFC 2623, sec 2.3.2 */
491 if (authflavor != RPC_AUTH_UNIX) {
492 struct rpc_auth *auth;
494 server->client_sys = rpc_clone_client(server->client);
495 if (IS_ERR(server->client_sys))
496 return PTR_ERR(server->client_sys);
497 auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
499 return PTR_ERR(auth);
501 atomic_inc(&server->client->cl_count);
502 server->client_sys = server->client;
504 if (server->flags & NFS_MOUNT_VER3) {
505 #ifdef CONFIG_NFS_V3_ACL
506 if (!(server->flags & NFS_MOUNT_NOACL)) {
507 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
508 /* No errors! Assume that Sun nfsacls are supported */
509 if (!IS_ERR(server->client_acl))
510 server->caps |= NFS_CAP_ACLS;
513 server->flags &= ~NFS_MOUNT_NOACL;
514 #endif /* CONFIG_NFS_V3_ACL */
516 * The VFS shouldn't apply the umask to mode bits. We will
517 * do so ourselves when necessary.
519 sb->s_flags |= MS_POSIXACL;
520 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
521 server->namelen = NFS3_MAXNAMLEN;
524 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
525 server->namelen = NFS2_MAXNAMLEN;
528 sb->s_op = &nfs_sops;
529 return nfs_sb_init(sb, authflavor);
533 nfs_statfs(struct super_block *sb, struct kstatfs *buf)
535 struct nfs_server *server = NFS_SB(sb);
536 unsigned char blockbits;
537 unsigned long blockres;
538 struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
539 struct nfs_fattr fattr;
540 struct nfs_fsstat res = {
547 error = server->rpc_ops->statfs(server, rootfh, &res);
548 buf->f_type = NFS_SUPER_MAGIC;
553 * Current versions of glibc do not correctly handle the
554 * case where f_frsize != f_bsize. Eventually we want to
555 * report the value of wtmult in this field.
557 buf->f_frsize = sb->s_blocksize;
560 * On most *nix systems, f_blocks, f_bfree, and f_bavail
561 * are reported in units of f_frsize. Linux hasn't had
562 * an f_frsize field in its statfs struct until recently,
563 * thus historically Linux's sys_statfs reports these
564 * fields in units of f_bsize.
566 buf->f_bsize = sb->s_blocksize;
567 blockbits = sb->s_blocksize_bits;
568 blockres = (1 << blockbits) - 1;
569 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
570 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
571 buf->f_bavail = (res.abytes + blockres) >> blockbits;
573 buf->f_files = res.tfiles;
574 buf->f_ffree = res.afiles;
576 buf->f_namelen = server->namelen;
582 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
583 buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
588 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
590 static struct proc_nfs_info {
595 { NFS_MOUNT_SOFT, ",soft", ",hard" },
596 { NFS_MOUNT_INTR, ",intr", "" },
597 { NFS_MOUNT_POSIX, ",posix", "" },
598 { NFS_MOUNT_NOCTO, ",nocto", "" },
599 { NFS_MOUNT_NOAC, ",noac", "" },
600 { NFS_MOUNT_NONLM, ",nolock", ",lock" },
601 { NFS_MOUNT_NOACL, ",noacl", "" },
602 { NFS_MOUNT_TAGXID, ",tagxid", "" },
605 struct proc_nfs_info *nfs_infop;
606 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
610 seq_printf(m, ",v%d", nfss->rpc_ops->version);
611 seq_printf(m, ",rsize=%d", nfss->rsize);
612 seq_printf(m, ",wsize=%d", nfss->wsize);
613 if (nfss->acregmin != 3*HZ)
614 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
615 if (nfss->acregmax != 60*HZ)
616 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
617 if (nfss->acdirmin != 30*HZ)
618 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
619 if (nfss->acdirmax != 60*HZ)
620 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
621 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
622 if (nfss->flags & nfs_infop->flag)
623 seq_puts(m, nfs_infop->str);
625 seq_puts(m, nfs_infop->nostr);
627 switch (nfss->client->cl_xprt->prot) {
635 snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
638 seq_printf(m, ",proto=%s", proto);
639 seq_puts(m, ",addr=");
640 seq_escape(m, nfss->hostname, " \t\n\\");
645 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
647 int nfs_sync_mapping(struct address_space *mapping)
651 if (mapping->nrpages == 0)
653 unmap_mapping_range(mapping, 0, 0, 0);
654 ret = filemap_write_and_wait(mapping);
657 ret = nfs_wb_all(mapping->host);
663 * Invalidate the local caches
665 static void nfs_zap_caches_locked(struct inode *inode)
667 struct nfs_inode *nfsi = NFS_I(inode);
668 int mode = inode->i_mode;
670 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
671 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
673 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
674 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
675 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
677 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
680 void nfs_zap_caches(struct inode *inode)
682 spin_lock(&inode->i_lock);
683 nfs_zap_caches_locked(inode);
684 spin_unlock(&inode->i_lock);
687 static void nfs_zap_acl_cache(struct inode *inode)
689 void (*clear_acl_cache)(struct inode *);
691 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
692 if (clear_acl_cache != NULL)
693 clear_acl_cache(inode);
694 spin_lock(&inode->i_lock);
695 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
696 spin_unlock(&inode->i_lock);
700 * Invalidate, but do not unhash, the inode.
701 * NB: must be called with inode->i_lock held!
703 static void nfs_invalidate_inode(struct inode *inode)
705 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
706 nfs_zap_caches_locked(inode);
709 struct nfs_find_desc {
711 struct nfs_fattr *fattr;
715 * In NFSv3 we can have 64bit inode numbers. In order to support
716 * this, and re-exported directories (also seen in NFSv2)
717 * we are forced to allow 2 different inodes to have the same
721 nfs_find_actor(struct inode *inode, void *opaque)
723 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
724 struct nfs_fh *fh = desc->fh;
725 struct nfs_fattr *fattr = desc->fattr;
727 if (NFS_FILEID(inode) != fattr->fileid)
729 if (nfs_compare_fh(NFS_FH(inode), fh))
731 if (is_bad_inode(inode) || NFS_STALE(inode))
737 nfs_init_locked(struct inode *inode, void *opaque)
739 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
740 struct nfs_fattr *fattr = desc->fattr;
742 NFS_FILEID(inode) = fattr->fileid;
743 nfs_copy_fh(NFS_FH(inode), desc->fh);
747 /* Don't use READDIRPLUS on directories that we believe are too large */
748 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
751 * This is our front-end to iget that looks up inodes by file handle
752 * instead of inode number.
755 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
757 struct nfs_find_desc desc = {
761 struct inode *inode = NULL;
764 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
768 printk("NFS: Buggy server - nlink == 0!\n");
772 hash = nfs_fattr_to_ino_t(fattr);
774 if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
777 if (inode->i_state & I_NEW) {
778 struct nfs_inode *nfsi = NFS_I(inode);
780 /* We set i_ino for the few things that still rely on it,
784 /* We can't support update_atime(), since the server will reset it */
785 inode->i_flags |= S_NOATIME|S_NOCMTIME;
786 inode->i_mode = fattr->mode;
787 /* Why so? Because we want revalidate for devices/FIFOs, and
788 * that's precisely what we have in nfs_file_inode_operations.
790 inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
791 if (S_ISREG(inode->i_mode)) {
792 inode->i_fop = &nfs_file_operations;
793 inode->i_data.a_ops = &nfs_file_aops;
794 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
795 } else if (S_ISDIR(inode->i_mode)) {
796 inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
797 inode->i_fop = &nfs_dir_operations;
798 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
799 && fattr->size <= NFS_LIMIT_READDIRPLUS)
800 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
801 } else if (S_ISLNK(inode->i_mode))
802 inode->i_op = &nfs_symlink_inode_operations;
804 init_special_inode(inode, inode->i_mode, fattr->rdev);
806 nfsi->read_cache_jiffies = fattr->time_start;
807 nfsi->last_updated = jiffies;
808 inode->i_atime = fattr->atime;
809 inode->i_mtime = fattr->mtime;
810 inode->i_ctime = fattr->ctime;
811 if (fattr->valid & NFS_ATTR_FATTR_V4)
812 nfsi->change_attr = fattr->change_attr;
813 inode->i_size = nfs_size_to_loff_t(fattr->size);
814 inode->i_nlink = fattr->nlink;
815 inode->i_uid = INOXID_UID(XID_TAG(inode), fattr->uid, fattr->gid);
816 inode->i_gid = INOXID_GID(XID_TAG(inode), fattr->uid, fattr->gid);
817 inode->i_xid = INOXID_XID(XID_TAG(inode), fattr->uid, fattr->gid, 0);
818 /* maybe fattr->xid someday */
819 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
821 * report the blocks in 512byte units
823 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
824 inode->i_blksize = inode->i_sb->s_blocksize;
826 inode->i_blocks = fattr->du.nfs2.blocks;
827 inode->i_blksize = fattr->du.nfs2.blocksize;
829 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
830 nfsi->attrtimeo_timestamp = jiffies;
831 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
832 nfsi->cache_access.cred = NULL;
834 unlock_new_inode(inode);
836 nfs_refresh_inode(inode, fattr);
837 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
839 (long long)NFS_FILEID(inode),
840 atomic_read(&inode->i_count));
846 printk("nfs_fhget: iget failed\n");
850 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
853 nfs_setattr(struct dentry *dentry, struct iattr *attr)
855 struct inode *inode = dentry->d_inode;
856 struct nfs_fattr fattr;
859 if (attr->ia_valid & ATTR_SIZE) {
860 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
861 attr->ia_valid &= ~ATTR_SIZE;
864 /* Optimization: if the end result is no change, don't RPC */
865 attr->ia_valid &= NFS_VALID_ATTRS;
866 if (attr->ia_valid == 0)
870 nfs_begin_data_update(inode);
871 /* Write all dirty data if we're changing file permissions or size */
872 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
873 filemap_write_and_wait(inode->i_mapping);
877 * Return any delegations if we're going to change ACLs
879 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
880 nfs_inode_return_delegation(inode);
881 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
883 nfs_refresh_inode(inode, &fattr);
884 nfs_end_data_update(inode);
890 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
891 * @inode: pointer to struct inode
892 * @attr: pointer to struct iattr
894 * Note: we do this in the *proc.c in order to ensure that
895 * it works for things like exclusive creates too.
897 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
899 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
900 if ((attr->ia_valid & ATTR_MODE) != 0) {
901 int mode = attr->ia_mode & S_IALLUGO;
902 mode |= inode->i_mode & ~S_IALLUGO;
903 inode->i_mode = mode;
905 if ((attr->ia_valid & ATTR_UID) != 0)
906 inode->i_uid = attr->ia_uid;
907 if ((attr->ia_valid & ATTR_GID) != 0)
908 inode->i_gid = attr->ia_gid;
909 if ((attr->ia_valid & ATTR_XID) && IS_TAGXID(inode))
910 inode->i_xid = attr->ia_xid;
911 spin_lock(&inode->i_lock);
912 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
913 spin_unlock(&inode->i_lock);
915 if ((attr->ia_valid & ATTR_SIZE) != 0) {
916 inode->i_size = attr->ia_size;
917 vmtruncate(inode, attr->ia_size);
921 static int nfs_wait_schedule(void *word)
923 if (signal_pending(current))
930 * Wait for the inode to get unlocked.
932 static int nfs_wait_on_inode(struct inode *inode)
934 struct rpc_clnt *clnt = NFS_CLIENT(inode);
935 struct nfs_inode *nfsi = NFS_I(inode);
939 rpc_clnt_sigmask(clnt, &oldmask);
940 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
941 nfs_wait_schedule, TASK_INTERRUPTIBLE);
942 rpc_clnt_sigunmask(clnt, &oldmask);
947 static void nfs_wake_up_inode(struct inode *inode)
949 struct nfs_inode *nfsi = NFS_I(inode);
951 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
952 smp_mb__after_clear_bit();
953 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
956 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
958 struct inode *inode = dentry->d_inode;
959 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
962 /* Flush out writes to the server in order to update c/mtime */
963 nfs_sync_inode(inode, 0, 0, FLUSH_WAIT|FLUSH_NOCOMMIT);
966 * We may force a getattr if the user cares about atime.
968 * Note that we only have to check the vfsmount flags here:
969 * - NFS always sets S_NOATIME by so checking it would give a
971 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
972 * no point in checking those.
974 if ((mnt->mnt_flags & MNT_NOATIME) ||
975 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
979 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
981 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
983 generic_fillattr(inode, stat);
987 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
989 struct nfs_open_context *ctx;
991 ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
993 atomic_set(&ctx->count, 1);
994 ctx->dentry = dget(dentry);
995 ctx->cred = get_rpccred(cred);
997 ctx->lockowner = current->files;
1004 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1007 atomic_inc(&ctx->count);
1011 void put_nfs_open_context(struct nfs_open_context *ctx)
1013 if (atomic_dec_and_test(&ctx->count)) {
1014 if (!list_empty(&ctx->list)) {
1015 struct inode *inode = ctx->dentry->d_inode;
1016 spin_lock(&inode->i_lock);
1017 list_del(&ctx->list);
1018 spin_unlock(&inode->i_lock);
1020 if (ctx->state != NULL)
1021 nfs4_close_state(ctx->state, ctx->mode);
1022 if (ctx->cred != NULL)
1023 put_rpccred(ctx->cred);
1030 * Ensure that mmap has a recent RPC credential for use when writing out
1033 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1035 struct inode *inode = filp->f_dentry->d_inode;
1036 struct nfs_inode *nfsi = NFS_I(inode);
1038 filp->private_data = get_nfs_open_context(ctx);
1039 spin_lock(&inode->i_lock);
1040 list_add(&ctx->list, &nfsi->open_files);
1041 spin_unlock(&inode->i_lock);
1045 * Given an inode, search for an open context with the desired characteristics
1047 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
1049 struct nfs_inode *nfsi = NFS_I(inode);
1050 struct nfs_open_context *pos, *ctx = NULL;
1052 spin_lock(&inode->i_lock);
1053 list_for_each_entry(pos, &nfsi->open_files, list) {
1054 if (cred != NULL && pos->cred != cred)
1056 if ((pos->mode & mode) == mode) {
1057 ctx = get_nfs_open_context(pos);
1061 spin_unlock(&inode->i_lock);
1065 void nfs_file_clear_open_context(struct file *filp)
1067 struct inode *inode = filp->f_dentry->d_inode;
1068 struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
1071 filp->private_data = NULL;
1072 spin_lock(&inode->i_lock);
1073 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1074 spin_unlock(&inode->i_lock);
1075 put_nfs_open_context(ctx);
1080 * These allocate and release file read/write context information.
1082 int nfs_open(struct inode *inode, struct file *filp)
1084 struct nfs_open_context *ctx;
1085 struct rpc_cred *cred;
1087 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1089 return PTR_ERR(cred);
1090 ctx = alloc_nfs_open_context(filp->f_dentry, cred);
1094 ctx->mode = filp->f_mode;
1095 nfs_file_set_open_context(filp, ctx);
1096 put_nfs_open_context(ctx);
1100 int nfs_release(struct inode *inode, struct file *filp)
1102 nfs_file_clear_open_context(filp);
1107 * This function is called whenever some part of NFS notices that
1108 * the cached attributes have to be refreshed.
1111 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1113 int status = -ESTALE;
1114 struct nfs_fattr fattr;
1115 struct nfs_inode *nfsi = NFS_I(inode);
1117 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
1118 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
1121 if (!inode || is_bad_inode(inode))
1123 if (NFS_STALE(inode))
1126 status = nfs_wait_on_inode(inode);
1129 if (NFS_STALE(inode)) {
1131 /* Do we trust the cached ESTALE? */
1132 if (NFS_ATTRTIMEO(inode) != 0) {
1133 if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
1140 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
1142 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
1144 (long long)NFS_FILEID(inode), status);
1145 if (status == -ESTALE) {
1146 nfs_zap_caches(inode);
1147 if (!S_ISDIR(inode->i_mode))
1148 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
1153 spin_lock(&inode->i_lock);
1154 status = nfs_update_inode(inode, &fattr);
1156 spin_unlock(&inode->i_lock);
1157 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
1159 (long long)NFS_FILEID(inode), status);
1162 spin_unlock(&inode->i_lock);
1164 nfs_revalidate_mapping(inode, inode->i_mapping);
1166 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1167 nfs_zap_acl_cache(inode);
1169 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
1171 (long long)NFS_FILEID(inode));
1174 nfs_wake_up_inode(inode);
1181 int nfs_attribute_timeout(struct inode *inode)
1183 struct nfs_inode *nfsi = NFS_I(inode);
1185 if (nfs_have_delegation(inode, FMODE_READ))
1187 return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
1191 * nfs_revalidate_inode - Revalidate the inode attributes
1192 * @server - pointer to nfs_server struct
1193 * @inode - pointer to inode struct
1195 * Updates inode attribute information by retrieving the data from the server.
1197 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1199 if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
1200 && !nfs_attribute_timeout(inode))
1201 return NFS_STALE(inode) ? -ESTALE : 0;
1202 return __nfs_revalidate_inode(server, inode);
1206 * nfs_revalidate_mapping - Revalidate the pagecache
1207 * @inode - pointer to host inode
1208 * @mapping - pointer to mapping
1210 void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1212 struct nfs_inode *nfsi = NFS_I(inode);
1214 if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
1215 if (S_ISREG(inode->i_mode))
1216 nfs_sync_mapping(mapping);
1217 invalidate_inode_pages2(mapping);
1219 spin_lock(&inode->i_lock);
1220 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1221 if (S_ISDIR(inode->i_mode)) {
1222 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1223 /* This ensures we revalidate child dentries */
1224 nfsi->cache_change_attribute = jiffies;
1226 spin_unlock(&inode->i_lock);
1228 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
1230 (long long)NFS_FILEID(inode));
1235 * nfs_begin_data_update
1236 * @inode - pointer to inode
1237 * Declare that a set of operations will update file data on the server
1239 void nfs_begin_data_update(struct inode *inode)
1241 atomic_inc(&NFS_I(inode)->data_updates);
1245 * nfs_end_data_update
1246 * @inode - pointer to inode
1247 * Declare end of the operations that will update file data
1248 * This will mark the inode as immediately needing revalidation
1249 * of its attribute cache.
1251 void nfs_end_data_update(struct inode *inode)
1253 struct nfs_inode *nfsi = NFS_I(inode);
1255 if (!nfs_have_delegation(inode, FMODE_READ)) {
1256 /* Directories and symlinks: invalidate page cache */
1257 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
1258 spin_lock(&inode->i_lock);
1259 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1260 spin_unlock(&inode->i_lock);
1263 nfsi->cache_change_attribute = jiffies;
1264 atomic_dec(&nfsi->data_updates);
1267 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1269 struct nfs_inode *nfsi = NFS_I(inode);
1271 if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
1272 && nfsi->change_attr == fattr->pre_change_attr) {
1273 nfsi->change_attr = fattr->change_attr;
1274 nfsi->cache_change_attribute = jiffies;
1277 /* If we have atomic WCC data, we may update some attributes */
1278 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
1279 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1280 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1281 nfsi->cache_change_attribute = jiffies;
1283 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1284 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1285 nfsi->cache_change_attribute = jiffies;
1287 if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
1288 inode->i_size = fattr->size;
1289 nfsi->cache_change_attribute = jiffies;
1295 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1296 * @inode - pointer to inode
1297 * @fattr - updated attributes
1299 * Verifies the attribute cache. If we have just changed the attributes,
1300 * so that fattr carries weak cache consistency data, then it may
1301 * also update the ctime/mtime/change_attribute.
1303 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1305 struct nfs_inode *nfsi = NFS_I(inode);
1306 loff_t cur_size, new_isize;
1313 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1316 /* Are we in the process of updating data on the server? */
1317 data_unstable = nfs_caches_unstable(inode);
1319 /* Do atomic weak cache consistency updates */
1320 nfs_wcc_update_inode(inode, fattr);
1322 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
1323 nfsi->change_attr != fattr->change_attr) {
1324 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1326 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1329 /* Has the inode gone and changed behind our back? */
1330 if (nfsi->fileid != fattr->fileid
1331 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1335 cur_size = i_size_read(inode);
1336 new_isize = nfs_size_to_loff_t(fattr->size);
1338 /* Verify a few of the more important attributes */
1339 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1340 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1342 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1344 if (cur_size != new_isize) {
1345 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1346 if (nfsi->npages == 0)
1347 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1350 uid = INOXID_UID(XID_TAG(inode), fattr->uid, fattr->gid);
1351 gid = INOXID_GID(XID_TAG(inode), fattr->uid, fattr->gid);
1352 xid = INOXID_XID(XID_TAG(inode), fattr->uid, fattr->gid, 0);
1354 /* Have any file permissions changed? */
1355 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
1356 || inode->i_uid != uid
1357 || inode->i_gid != gid
1358 || inode->i_xid != xid)
1359 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1361 /* Has the link count changed? */
1362 if (inode->i_nlink != fattr->nlink)
1363 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
1365 if (!timespec_equal(&inode->i_atime, &fattr->atime))
1366 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
1368 nfsi->read_cache_jiffies = fattr->time_start;
1373 * nfs_refresh_inode - try to update the inode attribute cache
1374 * @inode - pointer to inode
1375 * @fattr - updated attributes
1377 * Check that an RPC call that returned attributes has not overlapped with
1378 * other recent updates of the inode metadata, then decide whether it is
1379 * safe to do a full update of the inode attributes, or whether just to
1380 * call nfs_check_inode_attributes.
1382 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1384 struct nfs_inode *nfsi = NFS_I(inode);
1387 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1389 spin_lock(&inode->i_lock);
1390 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1391 if (time_after(fattr->time_start, nfsi->last_updated))
1392 status = nfs_update_inode(inode, fattr);
1394 status = nfs_check_inode_attributes(inode, fattr);
1396 spin_unlock(&inode->i_lock);
1401 * nfs_post_op_update_inode - try to update the inode attribute cache
1402 * @inode - pointer to inode
1403 * @fattr - updated attributes
1405 * After an operation that has changed the inode metadata, mark the
1406 * attribute cache as being invalid, then try to update it.
1408 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1410 struct nfs_inode *nfsi = NFS_I(inode);
1413 spin_lock(&inode->i_lock);
1414 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
1415 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
1418 status = nfs_update_inode(inode, fattr);
1420 spin_unlock(&inode->i_lock);
1425 * Many nfs protocol calls return the new file attributes after
1426 * an operation. Here we update the inode to reflect the state
1427 * of the server's inode.
1429 * This is a bit tricky because we have to make sure all dirty pages
1430 * have been sent off to the server before calling invalidate_inode_pages.
1431 * To make sure no other process adds more write requests while we try
1432 * our best to flush them, we make them sleep during the attribute refresh.
1434 * A very similar scenario holds for the dir cache.
1436 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1438 struct nfs_inode *nfsi = NFS_I(inode);
1439 loff_t cur_isize, new_isize;
1440 unsigned int invalid = 0;
1446 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1447 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
1448 atomic_read(&inode->i_count), fattr->valid);
1450 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1453 if (nfsi->fileid != fattr->fileid)
1457 * Make sure the inode's type hasn't changed.
1459 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1463 * Update the read time so we don't revalidate too often.
1465 nfsi->read_cache_jiffies = fattr->time_start;
1466 nfsi->last_updated = jiffies;
1468 /* Are we racing with known updates of the metadata on the server? */
1469 data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
1471 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
1473 /* Do atomic weak cache consistency updates */
1474 nfs_wcc_update_inode(inode, fattr);
1476 /* Check if our cached file size is stale */
1477 new_isize = nfs_size_to_loff_t(fattr->size);
1478 cur_isize = i_size_read(inode);
1479 if (new_isize != cur_isize) {
1480 /* Do we perhaps have any outstanding writes? */
1481 if (nfsi->npages == 0) {
1482 /* No, but did we race with nfs_end_data_update()? */
1484 inode->i_size = new_isize;
1485 invalid |= NFS_INO_INVALID_DATA;
1487 invalid |= NFS_INO_INVALID_ATTR;
1488 } else if (new_isize > cur_isize) {
1489 inode->i_size = new_isize;
1490 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1492 nfsi->cache_change_attribute = jiffies;
1493 dprintk("NFS: isize change on server for file %s/%ld\n",
1494 inode->i_sb->s_id, inode->i_ino);
1497 /* Check if the mtime agrees */
1498 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1499 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1500 dprintk("NFS: mtime change on server for file %s/%ld\n",
1501 inode->i_sb->s_id, inode->i_ino);
1502 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1503 nfsi->cache_change_attribute = jiffies;
1506 if ((fattr->valid & NFS_ATTR_FATTR_V4)
1507 && nfsi->change_attr != fattr->change_attr) {
1508 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1509 inode->i_sb->s_id, inode->i_ino);
1510 nfsi->change_attr = fattr->change_attr;
1511 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1512 nfsi->cache_change_attribute = jiffies;
1515 /* If ctime has changed we should definitely clear access+acl caches */
1516 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1517 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1518 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1519 nfsi->cache_change_attribute = jiffies;
1521 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1523 uid = INOXID_UID(XID_TAG(inode), fattr->uid, fattr->gid);
1524 gid = INOXID_GID(XID_TAG(inode), fattr->uid, fattr->gid);
1525 xid = INOXID_XID(XID_TAG(inode), fattr->uid, fattr->gid, 0);
1527 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1528 inode->i_uid != uid ||
1529 inode->i_gid != gid ||
1530 inode->i_xid != xid)
1531 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1533 inode->i_mode = fattr->mode;
1534 inode->i_nlink = fattr->nlink;
1539 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1541 * report the blocks in 512byte units
1543 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1544 inode->i_blksize = inode->i_sb->s_blocksize;
1546 inode->i_blocks = fattr->du.nfs2.blocks;
1547 inode->i_blksize = fattr->du.nfs2.blocksize;
1550 /* Update attrtimeo value if we're out of the unstable period */
1551 if (invalid & NFS_INO_INVALID_ATTR) {
1552 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1553 nfsi->attrtimeo_timestamp = jiffies;
1554 } else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
1555 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1556 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1557 nfsi->attrtimeo_timestamp = jiffies;
1559 /* Don't invalidate the data if we were to blame */
1560 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1561 || S_ISLNK(inode->i_mode)))
1562 invalid &= ~NFS_INO_INVALID_DATA;
1564 invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
1565 if (!nfs_have_delegation(inode, FMODE_READ))
1566 nfsi->cache_validity |= invalid;
1571 * Big trouble! The inode has become a different object.
1574 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1575 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1579 * No need to worry about unhashing the dentry, as the
1580 * lookup validation will know that the inode is bad.
1581 * (But we fall through to invalidate the caches.)
1583 nfs_invalidate_inode(inode);
1587 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1588 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1589 NFS_SERVER(inode)->hostname, inode->i_sb->s_id,
1590 (long long)nfsi->fileid, (long long)fattr->fileid);
1595 * File system information
1598 static int nfs_set_super(struct super_block *s, void *data)
1600 s->s_fs_info = data;
1601 return set_anon_super(s, data);
1604 static int nfs_compare_super(struct super_block *sb, void *data)
1606 struct nfs_server *server = data;
1607 struct nfs_server *old = NFS_SB(sb);
1609 if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
1611 if (old->addr.sin_port != server->addr.sin_port)
1613 return !nfs_compare_fh(&old->fh, &server->fh);
1616 static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
1617 int flags, const char *dev_name, void *raw_data)
1620 struct nfs_server *server = NULL;
1621 struct super_block *s;
1622 struct nfs_fh *root;
1623 struct nfs_mount_data *data = raw_data;
1625 s = ERR_PTR(-EINVAL);
1627 dprintk("%s: missing data argument\n", __FUNCTION__);
1630 if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
1631 dprintk("%s: bad mount version\n", __FUNCTION__);
1634 switch (data->version) {
1640 if (data->flags & NFS_MOUNT_VER3) {
1641 dprintk("%s: mount structure version %d does not support NFSv3\n",
1646 data->root.size = NFS2_FHSIZE;
1647 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1649 if (data->flags & NFS_MOUNT_SECFLAVOUR) {
1650 dprintk("%s: mount structure version %d does not support strong security\n",
1656 memset(data->context, 0, sizeof(data->context));
1658 #ifndef CONFIG_NFS_V3
1659 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
1660 s = ERR_PTR(-EPROTONOSUPPORT);
1661 if (data->flags & NFS_MOUNT_VER3) {
1662 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
1665 #endif /* CONFIG_NFS_V3 */
1667 s = ERR_PTR(-ENOMEM);
1668 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1671 memset(server, 0, sizeof(struct nfs_server));
1672 /* Zero out the NFS state stuff */
1673 init_nfsv4_state(server);
1674 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1677 if (data->flags & NFS_MOUNT_VER3)
1678 root->size = data->root.size;
1680 root->size = NFS2_FHSIZE;
1681 s = ERR_PTR(-EINVAL);
1682 if (root->size > sizeof(root->data)) {
1683 dprintk("%s: invalid root filehandle\n", __FUNCTION__);
1686 memcpy(root->data, data->root.data, root->size);
1688 /* We now require that the mount process passes the remote address */
1689 memcpy(&server->addr, &data->addr, sizeof(server->addr));
1690 if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1691 dprintk("%s: mount program didn't pass remote address!\n",
1696 /* Fire up rpciod if not yet running */
1697 s = ERR_PTR(rpciod_up());
1699 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1700 __FUNCTION__, PTR_ERR(s));
1704 s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
1705 if (IS_ERR(s) || s->s_root)
1706 goto out_rpciod_down;
1710 error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
1712 up_write(&s->s_umount);
1713 deactivate_super(s);
1714 return ERR_PTR(error);
1716 s->s_flags |= MS_ACTIVE;
1725 static void nfs_kill_super(struct super_block *s)
1727 struct nfs_server *server = NFS_SB(s);
1731 if (!IS_ERR(server->client))
1732 rpc_shutdown_client(server->client);
1733 if (!IS_ERR(server->client_sys))
1734 rpc_shutdown_client(server->client_sys);
1735 if (!IS_ERR(server->client_acl))
1736 rpc_shutdown_client(server->client_acl);
1738 if (!(server->flags & NFS_MOUNT_NONLM))
1739 lockd_down(); /* release rpc.lockd */
1741 rpciod_down(); /* release rpciod */
1743 kfree(server->hostname);
1747 static struct file_system_type nfs_fs_type = {
1748 .owner = THIS_MODULE,
1750 .get_sb = nfs_get_sb,
1751 .kill_sb = nfs_kill_super,
1752 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
1755 #ifdef CONFIG_NFS_V4
1757 static void nfs4_clear_inode(struct inode *);
1760 static struct super_operations nfs4_sops = {
1761 .alloc_inode = nfs_alloc_inode,
1762 .destroy_inode = nfs_destroy_inode,
1763 .write_inode = nfs_write_inode,
1764 .delete_inode = nfs_delete_inode,
1765 .statfs = nfs_statfs,
1766 .clear_inode = nfs4_clear_inode,
1767 .umount_begin = nfs_umount_begin,
1768 .show_options = nfs_show_options,
1772 * Clean out any remaining NFSv4 state that might be left over due
1773 * to open() calls that passed nfs_atomic_lookup, but failed to call
1776 static void nfs4_clear_inode(struct inode *inode)
1778 struct nfs_inode *nfsi = NFS_I(inode);
1780 /* If we are holding a delegation, return it! */
1781 nfs_inode_return_delegation(inode);
1782 /* First call standard NFS clear_inode() code */
1783 nfs_clear_inode(inode);
1784 /* Now clear out any remaining state */
1785 while (!list_empty(&nfsi->open_states)) {
1786 struct nfs4_state *state;
1788 state = list_entry(nfsi->open_states.next,
1791 dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
1794 (long long)NFS_FILEID(inode),
1796 BUG_ON(atomic_read(&state->count) != 1);
1797 nfs4_close_state(state, state->state);
1802 static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
1804 struct nfs_server *server;
1805 struct nfs4_client *clp = NULL;
1806 struct rpc_xprt *xprt = NULL;
1807 struct rpc_clnt *clnt = NULL;
1808 struct rpc_timeout timeparms;
1809 rpc_authflavor_t authflavour;
1812 sb->s_blocksize_bits = 0;
1813 sb->s_blocksize = 0;
1814 server = NFS_SB(sb);
1815 if (data->rsize != 0)
1816 server->rsize = nfs_block_size(data->rsize, NULL);
1817 if (data->wsize != 0)
1818 server->wsize = nfs_block_size(data->wsize, NULL);
1819 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
1820 server->caps = NFS_CAP_ATOMIC_OPEN;
1822 server->acregmin = data->acregmin*HZ;
1823 server->acregmax = data->acregmax*HZ;
1824 server->acdirmin = data->acdirmin*HZ;
1825 server->acdirmax = data->acdirmax*HZ;
1827 server->rpc_ops = &nfs_v4_clientops;
1829 nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
1831 clp = nfs4_get_client(&server->addr.sin_addr);
1833 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
1837 /* Now create transport and client */
1838 authflavour = RPC_AUTH_UNIX;
1839 if (data->auth_flavourlen != 0) {
1840 if (data->auth_flavourlen != 1) {
1841 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1842 __FUNCTION__, data->auth_flavourlen);
1846 if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
1852 down_write(&clp->cl_sem);
1853 if (IS_ERR(clp->cl_rpcclient)) {
1854 xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
1856 up_write(&clp->cl_sem);
1857 err = PTR_ERR(xprt);
1858 dprintk("%s: cannot create RPC transport. Error = %d\n",
1862 clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
1863 server->rpc_ops->version, authflavour);
1865 up_write(&clp->cl_sem);
1866 err = PTR_ERR(clnt);
1867 dprintk("%s: cannot create RPC client. Error = %d\n",
1872 clnt->cl_softrtry = 1;
1873 clp->cl_rpcclient = clnt;
1874 memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
1877 list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
1878 clnt = rpc_clone_client(clp->cl_rpcclient);
1880 server->nfs4_state = clp;
1881 up_write(&clp->cl_sem);
1885 err = PTR_ERR(clnt);
1886 dprintk("%s: cannot create RPC client. Error = %d\n",
1891 server->client = clnt;
1893 if (server->nfs4_state->cl_idmap == NULL) {
1894 dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
1898 if (clnt->cl_auth->au_flavor != authflavour) {
1899 struct rpc_auth *auth;
1901 auth = rpcauth_create(authflavour, clnt);
1903 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1904 return PTR_ERR(auth);
1908 sb->s_time_gran = 1;
1910 sb->s_op = &nfs4_sops;
1911 err = nfs_sb_init(sb, authflavour);
1916 nfs4_put_client(clp);
1920 static int nfs4_compare_super(struct super_block *sb, void *data)
1922 struct nfs_server *server = data;
1923 struct nfs_server *old = NFS_SB(sb);
1925 if (strcmp(server->hostname, old->hostname) != 0)
1927 if (strcmp(server->mnt_path, old->mnt_path) != 0)
1933 nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
1938 return ERR_PTR(-EINVAL);
1939 if (src->len < maxlen)
1942 p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
1944 return ERR_PTR(-ENOMEM);
1946 if (copy_from_user(dst, src->data, maxlen)) {
1948 return ERR_PTR(-EFAULT);
1954 static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
1955 int flags, const char *dev_name, void *raw_data)
1958 struct nfs_server *server;
1959 struct super_block *s;
1960 struct nfs4_mount_data *data = raw_data;
1964 dprintk("%s: missing data argument\n", __FUNCTION__);
1965 return ERR_PTR(-EINVAL);
1967 if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
1968 dprintk("%s: bad mount version\n", __FUNCTION__);
1969 return ERR_PTR(-EINVAL);
1972 server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
1974 return ERR_PTR(-ENOMEM);
1975 memset(server, 0, sizeof(struct nfs_server));
1976 /* Zero out the NFS state stuff */
1977 init_nfsv4_state(server);
1978 server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
1980 p = nfs_copy_user_string(NULL, &data->hostname, 256);
1983 server->hostname = p;
1985 p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
1988 server->mnt_path = p;
1990 p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
1991 sizeof(server->ip_addr) - 1);
1995 /* We now require that the mount process passes the remote address */
1996 if (data->host_addrlen != sizeof(server->addr)) {
1997 s = ERR_PTR(-EINVAL);
2000 if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
2001 s = ERR_PTR(-EFAULT);
2004 if (server->addr.sin_family != AF_INET ||
2005 server->addr.sin_addr.s_addr == INADDR_ANY) {
2006 dprintk("%s: mount program didn't pass remote IP address!\n",
2008 s = ERR_PTR(-EINVAL);
2012 /* Fire up rpciod if not yet running */
2013 s = ERR_PTR(rpciod_up());
2015 dprintk("%s: couldn't start rpciod! Error = %ld\n",
2016 __FUNCTION__, PTR_ERR(s));
2020 s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
2022 if (IS_ERR(s) || s->s_root)
2027 error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
2029 up_write(&s->s_umount);
2030 deactivate_super(s);
2031 return ERR_PTR(error);
2033 s->s_flags |= MS_ACTIVE;
2036 s = (struct super_block *)p;
2038 kfree(server->mnt_path);
2039 kfree(server->hostname);
2044 static void nfs4_kill_super(struct super_block *sb)
2046 struct nfs_server *server = NFS_SB(sb);
2048 nfs_return_all_delegations(sb);
2049 kill_anon_super(sb);
2051 nfs4_renewd_prepare_shutdown(server);
2053 if (server->client != NULL && !IS_ERR(server->client))
2054 rpc_shutdown_client(server->client);
2055 rpciod_down(); /* release rpciod */
2057 destroy_nfsv4_state(server);
2059 kfree(server->hostname);
2063 static struct file_system_type nfs4_fs_type = {
2064 .owner = THIS_MODULE,
2066 .get_sb = nfs4_get_sb,
2067 .kill_sb = nfs4_kill_super,
2068 .fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
2071 static const int nfs_set_port_min = 0;
2072 static const int nfs_set_port_max = 65535;
2073 static int param_set_port(const char *val, struct kernel_param *kp)
2076 int num = simple_strtol(val, &endp, 0);
2077 if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
2079 *((int *)kp->arg) = num;
2083 module_param_call(callback_tcpport, param_set_port, param_get_int,
2084 &nfs_callback_set_tcpport, 0644);
2086 static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
2089 int num = simple_strtol(val, &endp, 0);
2091 if (endp == val || *endp || num < 0 || jif < num)
2093 *((int *)kp->arg) = jif;
2097 module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
2098 &nfs_idmap_cache_timeout, 0644);
2100 #define nfs4_init_once(nfsi) \
2102 INIT_LIST_HEAD(&(nfsi)->open_states); \
2103 nfsi->delegation = NULL; \
2104 nfsi->delegation_state = 0; \
2105 init_rwsem(&nfsi->rwsem); \
2108 static inline int register_nfs4fs(void)
2112 ret = nfs_register_sysctl();
2115 ret = register_filesystem(&nfs4_fs_type);
2117 nfs_unregister_sysctl();
2121 static inline void unregister_nfs4fs(void)
2123 unregister_filesystem(&nfs4_fs_type);
2124 nfs_unregister_sysctl();
2127 #define nfs4_init_once(nfsi) \
2129 #define register_nfs4fs() (0)
2130 #define unregister_nfs4fs()
2133 extern int nfs_init_nfspagecache(void);
2134 extern void nfs_destroy_nfspagecache(void);
2135 extern int nfs_init_readpagecache(void);
2136 extern void nfs_destroy_readpagecache(void);
2137 extern int nfs_init_writepagecache(void);
2138 extern void nfs_destroy_writepagecache(void);
2139 #ifdef CONFIG_NFS_DIRECTIO
2140 extern int nfs_init_directcache(void);
2141 extern void nfs_destroy_directcache(void);
2144 static kmem_cache_t * nfs_inode_cachep;
2146 static struct inode *nfs_alloc_inode(struct super_block *sb)
2148 struct nfs_inode *nfsi;
2149 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
2153 nfsi->cache_validity = 0UL;
2154 nfsi->cache_change_attribute = jiffies;
2155 #ifdef CONFIG_NFS_V3_ACL
2156 nfsi->acl_access = ERR_PTR(-EAGAIN);
2157 nfsi->acl_default = ERR_PTR(-EAGAIN);
2159 #ifdef CONFIG_NFS_V4
2160 nfsi->nfs4_acl = NULL;
2161 #endif /* CONFIG_NFS_V4 */
2162 return &nfsi->vfs_inode;
2165 static void nfs_destroy_inode(struct inode *inode)
2167 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2170 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
2172 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2174 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
2175 SLAB_CTOR_CONSTRUCTOR) {
2176 inode_init_once(&nfsi->vfs_inode);
2177 spin_lock_init(&nfsi->req_lock);
2178 INIT_LIST_HEAD(&nfsi->dirty);
2179 INIT_LIST_HEAD(&nfsi->commit);
2180 INIT_LIST_HEAD(&nfsi->open_files);
2181 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
2182 atomic_set(&nfsi->data_updates, 0);
2186 nfs4_init_once(nfsi);
2190 static int nfs_init_inodecache(void)
2192 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2193 sizeof(struct nfs_inode),
2194 0, SLAB_RECLAIM_ACCOUNT,
2196 if (nfs_inode_cachep == NULL)
2202 static void nfs_destroy_inodecache(void)
2204 if (kmem_cache_destroy(nfs_inode_cachep))
2205 printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
2211 static int __init init_nfs_fs(void)
2215 err = nfs_init_nfspagecache();
2219 err = nfs_init_inodecache();
2223 err = nfs_init_readpagecache();
2227 err = nfs_init_writepagecache();
2231 #ifdef CONFIG_NFS_DIRECTIO
2232 err = nfs_init_directcache();
2237 #ifdef CONFIG_PROC_FS
2238 rpc_proc_register(&nfs_rpcstat);
2240 err = register_filesystem(&nfs_fs_type);
2243 if ((err = register_nfs4fs()) != 0)
2247 #ifdef CONFIG_PROC_FS
2248 rpc_proc_unregister("nfs");
2250 #ifdef CONFIG_NFS_DIRECTIO
2251 nfs_destroy_directcache();
2254 nfs_destroy_writepagecache();
2256 nfs_destroy_readpagecache();
2258 nfs_destroy_inodecache();
2260 nfs_destroy_nfspagecache();
2265 static void __exit exit_nfs_fs(void)
2267 #ifdef CONFIG_NFS_DIRECTIO
2268 nfs_destroy_directcache();
2270 nfs_destroy_writepagecache();
2271 nfs_destroy_readpagecache();
2272 nfs_destroy_inodecache();
2273 nfs_destroy_nfspagecache();
2274 #ifdef CONFIG_PROC_FS
2275 rpc_proc_unregister("nfs");
2277 unregister_filesystem(&nfs_fs_type);
2278 unregister_nfs4fs();
2281 /* Not quite true; I just maintain it */
2282 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2283 MODULE_LICENSE("GPL");
2285 module_init(init_nfs_fs)
2286 module_exit(exit_nfs_fs)