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linux/fs/nfs/inode.c
Trond Myklebust 29884df0d8 NFS: Fix another O_DIRECT race 
Ensure we call unmap_mapping_range() and sync dirty pages to disk before
 doing an NFS direct write.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2005-12-19 23:12:09 -05:00

2206 lines
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/*
* linux/fs/nfs/inode.c
*
* Copyright (C) 1992 Rick Sladkey
*
* nfs inode and superblock handling functions
*
* Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
* experimental NFS changes. Modularisation taken straight from SYS5 fs.
*
* Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
* J.S.Peatfield@damtp.cam.ac.uk
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/smp_lock.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include "nfs4_fs.h"
#include "delegation.h"
#define NFSDBG_FACILITY NFSDBG_VFS
#define NFS_PARANOIA 1
/* Maximum number of readahead requests
* FIXME: this should really be a sysctl so that users may tune it to suit
* their needs. People that do NFS over a slow network, might for
* instance want to reduce it to something closer to 1 for improved
* interactive response.
*/
#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
static void nfs_invalidate_inode(struct inode *);
static int nfs_update_inode(struct inode *, struct nfs_fattr *);
static struct inode *nfs_alloc_inode(struct super_block *sb);
static void nfs_destroy_inode(struct inode *);
static int nfs_write_inode(struct inode *,int);
static void nfs_delete_inode(struct inode *);
static void nfs_clear_inode(struct inode *);
static void nfs_umount_begin(struct super_block *);
static int nfs_statfs(struct super_block *, struct kstatfs *);
static int nfs_show_options(struct seq_file *, struct vfsmount *);
static void nfs_zap_acl_cache(struct inode *);
static struct rpc_program nfs_program;
static struct super_operations nfs_sops = {
.alloc_inode = nfs_alloc_inode,
.destroy_inode = nfs_destroy_inode,
.write_inode = nfs_write_inode,
.delete_inode = nfs_delete_inode,
.statfs = nfs_statfs,
.clear_inode = nfs_clear_inode,
.umount_begin = nfs_umount_begin,
.show_options = nfs_show_options,
};
/*
* RPC cruft for NFS
*/
static struct rpc_stat nfs_rpcstat = {
.program = &nfs_program
};
static struct rpc_version * nfs_version[] = {
NULL,
NULL,
&nfs_version2,
#if defined(CONFIG_NFS_V3)
&nfs_version3,
#elif defined(CONFIG_NFS_V4)
NULL,
#endif
#if defined(CONFIG_NFS_V4)
&nfs_version4,
#endif
};
static struct rpc_program nfs_program = {
.name = "nfs",
.number = NFS_PROGRAM,
.nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
.version = nfs_version,
.stats = &nfs_rpcstat,
.pipe_dir_name = "/nfs",
};
#ifdef CONFIG_NFS_V3_ACL
static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
static struct rpc_version * nfsacl_version[] = {
[3] = &nfsacl_version3,
};
struct rpc_program nfsacl_program = {
.name = "nfsacl",
.number = NFS_ACL_PROGRAM,
.nrvers = sizeof(nfsacl_version) / sizeof(nfsacl_version[0]),
.version = nfsacl_version,
.stats = &nfsacl_rpcstat,
};
#endif /* CONFIG_NFS_V3_ACL */
static inline unsigned long
nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
{
return nfs_fileid_to_ino_t(fattr->fileid);
}
static int
nfs_write_inode(struct inode *inode, int sync)
{
int flags = sync ? FLUSH_WAIT : 0;
int ret;
ret = nfs_commit_inode(inode, flags);
if (ret < 0)
return ret;
return 0;
}
static void
nfs_delete_inode(struct inode * inode)
{
dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
truncate_inode_pages(&inode->i_data, 0);
nfs_wb_all(inode);
/*
* The following should never happen...
*/
if (nfs_have_writebacks(inode)) {
printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
}
clear_inode(inode);
}
static void
nfs_clear_inode(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct rpc_cred *cred;
nfs_wb_all(inode);
BUG_ON (!list_empty(&nfsi->open_files));
nfs_zap_acl_cache(inode);
cred = nfsi->cache_access.cred;
if (cred)
put_rpccred(cred);
BUG_ON(atomic_read(&nfsi->data_updates) != 0);
}
void
nfs_umount_begin(struct super_block *sb)
{
struct rpc_clnt *rpc = NFS_SB(sb)->client;
/* -EIO all pending I/O */
if (!IS_ERR(rpc))
rpc_killall_tasks(rpc);
rpc = NFS_SB(sb)->client_acl;
if (!IS_ERR(rpc))
rpc_killall_tasks(rpc);
}
static inline unsigned long
nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
{
/* make sure blocksize is a power of two */
if ((bsize & (bsize - 1)) || nrbitsp) {
unsigned char nrbits;
for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
;
bsize = 1 << nrbits;
if (nrbitsp)
*nrbitsp = nrbits;
}
return bsize;
}
/*
* Calculate the number of 512byte blocks used.
*/
static inline unsigned long
nfs_calc_block_size(u64 tsize)
{
loff_t used = (tsize + 511) >> 9;
return (used > ULONG_MAX) ? ULONG_MAX : used;
}
/*
* Compute and set NFS server blocksize
*/
static inline unsigned long
nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
{
if (bsize < 1024)
bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
bsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
return nfs_block_bits(bsize, nrbitsp);
}
/*
* Obtain the root inode of the file system.
*/
static struct inode *
nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
{
struct nfs_server *server = NFS_SB(sb);
struct inode *rooti;
int error;
error = server->rpc_ops->getroot(server, rootfh, fsinfo);
if (error < 0) {
dprintk("nfs_get_root: getattr error = %d\n", -error);
return ERR_PTR(error);
}
rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
if (!rooti)
return ERR_PTR(-ENOMEM);
return rooti;
}
/*
* Do NFS version-independent mount processing, and sanity checking
*/
static int
nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
{
struct nfs_server *server;
struct inode *root_inode;
struct nfs_fattr fattr;
struct nfs_fsinfo fsinfo = {
.fattr = &fattr,
};
struct nfs_pathconf pathinfo = {
.fattr = &fattr,
};
int no_root_error = 0;
unsigned long max_rpc_payload;
/* We probably want something more informative here */
snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
server = NFS_SB(sb);
sb->s_magic = NFS_SUPER_MAGIC;
root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
/* Did getting the root inode fail? */
if (IS_ERR(root_inode)) {
no_root_error = PTR_ERR(root_inode);
goto out_no_root;
}
sb->s_root = d_alloc_root(root_inode);
if (!sb->s_root) {
no_root_error = -ENOMEM;
goto out_no_root;
}
sb->s_root->d_op = server->rpc_ops->dentry_ops;
/* Get some general file system info */
if (server->namelen == 0 &&
server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
server->namelen = pathinfo.max_namelen;
/* Work out a lot of parameters */
if (server->rsize == 0)
server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
if (server->wsize == 0)
server->wsize = nfs_block_size(fsinfo.wtpref, NULL);
if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
server->wsize = nfs_block_size(fsinfo.wtmax, NULL);
max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
if (server->rsize > max_rpc_payload)
server->rsize = max_rpc_payload;
if (server->wsize > max_rpc_payload)
server->wsize = max_rpc_payload;
server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (server->rpages > NFS_READ_MAXIOV) {
server->rpages = NFS_READ_MAXIOV;
server->rsize = server->rpages << PAGE_CACHE_SHIFT;
}
server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (server->wpages > NFS_WRITE_MAXIOV) {
server->wpages = NFS_WRITE_MAXIOV;
server->wsize = server->wpages << PAGE_CACHE_SHIFT;
}
if (sb->s_blocksize == 0)
sb->s_blocksize = nfs_block_bits(server->wsize,
&sb->s_blocksize_bits);
server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);
server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
if (server->dtsize > PAGE_CACHE_SIZE)
server->dtsize = PAGE_CACHE_SIZE;
if (server->dtsize > server->rsize)
server->dtsize = server->rsize;
if (server->flags & NFS_MOUNT_NOAC) {
server->acregmin = server->acregmax = 0;
server->acdirmin = server->acdirmax = 0;
sb->s_flags |= MS_SYNCHRONOUS;
}
server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
sb->s_maxbytes = fsinfo.maxfilesize;
if (sb->s_maxbytes > MAX_LFS_FILESIZE)
sb->s_maxbytes = MAX_LFS_FILESIZE;
server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
/* We're airborne Set socket buffersize */
rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
return 0;
/* Yargs. It didn't work out. */
out_no_root:
dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
if (!IS_ERR(root_inode))
iput(root_inode);
return no_root_error;
}
static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
{
to->to_initval = timeo * HZ / 10;
to->to_retries = retrans;
if (!to->to_retries)
to->to_retries = 2;
switch (proto) {
case IPPROTO_TCP:
if (!to->to_initval)
to->to_initval = 60 * HZ;
if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
to->to_initval = NFS_MAX_TCP_TIMEOUT;
to->to_increment = to->to_initval;
to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
to->to_exponential = 0;
break;
case IPPROTO_UDP:
default:
if (!to->to_initval)
to->to_initval = 11 * HZ / 10;
if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
to->to_initval = NFS_MAX_UDP_TIMEOUT;
to->to_maxval = NFS_MAX_UDP_TIMEOUT;
to->to_exponential = 1;
break;
}
}
/*
* Create an RPC client handle.
*/
static struct rpc_clnt *
nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
{
struct rpc_timeout timeparms;
struct rpc_xprt *xprt = NULL;
struct rpc_clnt *clnt = NULL;
int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
/* create transport and client */
xprt = xprt_create_proto(proto, &server->addr, &timeparms);
if (IS_ERR(xprt)) {
dprintk("%s: cannot create RPC transport. Error = %ld\n",
__FUNCTION__, PTR_ERR(xprt));
return (struct rpc_clnt *)xprt;
}
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
server->rpc_ops->version, data->pseudoflavor);
if (IS_ERR(clnt)) {
dprintk("%s: cannot create RPC client. Error = %ld\n",
__FUNCTION__, PTR_ERR(xprt));
goto out_fail;
}
clnt->cl_intr = 1;
clnt->cl_softrtry = 1;
clnt->cl_chatty = 1;
return clnt;
out_fail:
return clnt;
}
/*
* The way this works is that the mount process passes a structure
* in the data argument which contains the server's IP address
* and the root file handle obtained from the server's mount
* daemon. We stash these away in the private superblock fields.
*/
static int
nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
{
struct nfs_server *server;
rpc_authflavor_t authflavor;
server = NFS_SB(sb);
sb->s_blocksize_bits = 0;
sb->s_blocksize = 0;
if (data->bsize)
sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
if (data->rsize)
server->rsize = nfs_block_size(data->rsize, NULL);
if (data->wsize)
server->wsize = nfs_block_size(data->wsize, NULL);
server->flags = data->flags & NFS_MOUNT_FLAGMASK;
server->acregmin = data->acregmin*HZ;
server->acregmax = data->acregmax*HZ;
server->acdirmin = data->acdirmin*HZ;
server->acdirmax = data->acdirmax*HZ;
/* Start lockd here, before we might error out */
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_up();
server->namelen = data->namlen;
server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
if (!server->hostname)
return -ENOMEM;
strcpy(server->hostname, data->hostname);
/* Check NFS protocol revision and initialize RPC op vector
* and file handle pool. */
#ifdef CONFIG_NFS_V3
if (server->flags & NFS_MOUNT_VER3) {
server->rpc_ops = &nfs_v3_clientops;
server->caps |= NFS_CAP_READDIRPLUS;
} else {
server->rpc_ops = &nfs_v2_clientops;
}
#else
server->rpc_ops = &nfs_v2_clientops;
#endif
/* Fill in pseudoflavor for mount version < 5 */
if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
data->pseudoflavor = RPC_AUTH_UNIX;
authflavor = data->pseudoflavor; /* save for sb_init() */
/* XXX maybe we want to add a server->pseudoflavor field */
/* Create RPC client handles */
server->client = nfs_create_client(server, data);
if (IS_ERR(server->client))
return PTR_ERR(server->client);
/* RFC 2623, sec 2.3.2 */
if (authflavor != RPC_AUTH_UNIX) {
struct rpc_auth *auth;
server->client_sys = rpc_clone_client(server->client);
if (IS_ERR(server->client_sys))
return PTR_ERR(server->client_sys);
auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
if (IS_ERR(auth))
return PTR_ERR(auth);
} else {
atomic_inc(&server->client->cl_count);
server->client_sys = server->client;
}
if (server->flags & NFS_MOUNT_VER3) {
#ifdef CONFIG_NFS_V3_ACL
if (!(server->flags & NFS_MOUNT_NOACL)) {
server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
/* No errors! Assume that Sun nfsacls are supported */
if (!IS_ERR(server->client_acl))
server->caps |= NFS_CAP_ACLS;
}
#else
server->flags &= ~NFS_MOUNT_NOACL;
#endif /* CONFIG_NFS_V3_ACL */
/*
* The VFS shouldn't apply the umask to mode bits. We will
* do so ourselves when necessary.
*/
sb->s_flags |= MS_POSIXACL;
if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
server->namelen = NFS3_MAXNAMLEN;
sb->s_time_gran = 1;
} else {
if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
server->namelen = NFS2_MAXNAMLEN;
}
sb->s_op = &nfs_sops;
return nfs_sb_init(sb, authflavor);
}
static int
nfs_statfs(struct super_block *sb, struct kstatfs *buf)
{
struct nfs_server *server = NFS_SB(sb);
unsigned char blockbits;
unsigned long blockres;
struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
struct nfs_fattr fattr;
struct nfs_fsstat res = {
.fattr = &fattr,
};
int error;
lock_kernel();
error = server->rpc_ops->statfs(server, rootfh, &res);
buf->f_type = NFS_SUPER_MAGIC;
if (error < 0)
goto out_err;
/*
* Current versions of glibc do not correctly handle the
* case where f_frsize != f_bsize. Eventually we want to
* report the value of wtmult in this field.
*/
buf->f_frsize = sb->s_blocksize;
/*
* On most *nix systems, f_blocks, f_bfree, and f_bavail
* are reported in units of f_frsize. Linux hasn't had
* an f_frsize field in its statfs struct until recently,
* thus historically Linux's sys_statfs reports these
* fields in units of f_bsize.
*/
buf->f_bsize = sb->s_blocksize;
blockbits = sb->s_blocksize_bits;
blockres = (1 << blockbits) - 1;
buf->f_blocks = (res.tbytes + blockres) >> blockbits;
buf->f_bfree = (res.fbytes + blockres) >> blockbits;
buf->f_bavail = (res.abytes + blockres) >> blockbits;
buf->f_files = res.tfiles;
buf->f_ffree = res.afiles;
buf->f_namelen = server->namelen;
out:
unlock_kernel();
return 0;
out_err:
printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error);
buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
goto out;
}
static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
{
static struct proc_nfs_info {
int flag;
char *str;
char *nostr;
} nfs_info[] = {
{ NFS_MOUNT_SOFT, ",soft", ",hard" },
{ NFS_MOUNT_INTR, ",intr", "" },
{ NFS_MOUNT_POSIX, ",posix", "" },
{ NFS_MOUNT_NOCTO, ",nocto", "" },
{ NFS_MOUNT_NOAC, ",noac", "" },
{ NFS_MOUNT_NONLM, ",nolock", ",lock" },
{ NFS_MOUNT_NOACL, ",noacl", "" },
{ 0, NULL, NULL }
};
struct proc_nfs_info *nfs_infop;
struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
char buf[12];
char *proto;
seq_printf(m, ",v%d", nfss->rpc_ops->version);
seq_printf(m, ",rsize=%d", nfss->rsize);
seq_printf(m, ",wsize=%d", nfss->wsize);
if (nfss->acregmin != 3*HZ)
seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
if (nfss->acregmax != 60*HZ)
seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
if (nfss->acdirmin != 30*HZ)
seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
if (nfss->acdirmax != 60*HZ)
seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
if (nfss->flags & nfs_infop->flag)
seq_puts(m, nfs_infop->str);
else
seq_puts(m, nfs_infop->nostr);
}
switch (nfss->client->cl_xprt->prot) {
case IPPROTO_TCP:
proto = "tcp";
break;
case IPPROTO_UDP:
proto = "udp";
break;
default:
snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
proto = buf;
}
seq_printf(m, ",proto=%s", proto);
seq_puts(m, ",addr=");
seq_escape(m, nfss->hostname, " \t\n\\");
return 0;
}
/**
* nfs_sync_mapping - helper to flush all mmapped dirty data to disk
*/
int nfs_sync_mapping(struct address_space *mapping)
{
int ret;
if (mapping->nrpages == 0)
return 0;
unmap_mapping_range(mapping, 0, 0, 0);
ret = filemap_fdatawrite(mapping);
if (ret != 0)
goto out;
ret = filemap_fdatawait(mapping);
if (ret != 0)
goto out;
ret = nfs_wb_all(mapping->host);
out:
return ret;
}
/*
* Invalidate the local caches
*/
static void nfs_zap_caches_locked(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
int mode = inode->i_mode;
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
else
nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
}
void nfs_zap_caches(struct inode *inode)
{
spin_lock(&inode->i_lock);
nfs_zap_caches_locked(inode);
spin_unlock(&inode->i_lock);
}
static void nfs_zap_acl_cache(struct inode *inode)
{
void (*clear_acl_cache)(struct inode *);
clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
if (clear_acl_cache != NULL)
clear_acl_cache(inode);
spin_lock(&inode->i_lock);
NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
spin_unlock(&inode->i_lock);
}
/*
* Invalidate, but do not unhash, the inode.
* NB: must be called with inode->i_lock held!
*/
static void nfs_invalidate_inode(struct inode *inode)
{
set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
nfs_zap_caches_locked(inode);
}
struct nfs_find_desc {
struct nfs_fh *fh;
struct nfs_fattr *fattr;
};
/*
* In NFSv3 we can have 64bit inode numbers. In order to support
* this, and re-exported directories (also seen in NFSv2)
* we are forced to allow 2 different inodes to have the same
* i_ino.
*/
static int
nfs_find_actor(struct inode *inode, void *opaque)
{
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
struct nfs_fh *fh = desc->fh;
struct nfs_fattr *fattr = desc->fattr;
if (NFS_FILEID(inode) != fattr->fileid)
return 0;
if (nfs_compare_fh(NFS_FH(inode), fh))
return 0;
if (is_bad_inode(inode) || NFS_STALE(inode))
return 0;
return 1;
}
static int
nfs_init_locked(struct inode *inode, void *opaque)
{
struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
struct nfs_fattr *fattr = desc->fattr;
NFS_FILEID(inode) = fattr->fileid;
nfs_copy_fh(NFS_FH(inode), desc->fh);
return 0;
}
/* Don't use READDIRPLUS on directories that we believe are too large */
#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
/*
* This is our front-end to iget that looks up inodes by file handle
* instead of inode number.
*/
struct inode *
nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
{
struct nfs_find_desc desc = {
.fh = fh,
.fattr = fattr
};
struct inode *inode = NULL;
unsigned long hash;
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
goto out_no_inode;
if (!fattr->nlink) {
printk("NFS: Buggy server - nlink == 0!\n");
goto out_no_inode;
}
hash = nfs_fattr_to_ino_t(fattr);
if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
goto out_no_inode;
if (inode->i_state & I_NEW) {
struct nfs_inode *nfsi = NFS_I(inode);
/* We set i_ino for the few things that still rely on it,
* such as stat(2) */
inode->i_ino = hash;
/* We can't support update_atime(), since the server will reset it */
inode->i_flags |= S_NOATIME|S_NOCMTIME;
inode->i_mode = fattr->mode;
/* Why so? Because we want revalidate for devices/FIFOs, and
* that's precisely what we have in nfs_file_inode_operations.
*/
inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
if (S_ISREG(inode->i_mode)) {
inode->i_fop = &nfs_file_operations;
inode->i_data.a_ops = &nfs_file_aops;
inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
} else if (S_ISDIR(inode->i_mode)) {
inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
inode->i_fop = &nfs_dir_operations;
if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
&& fattr->size <= NFS_LIMIT_READDIRPLUS)
set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
} else if (S_ISLNK(inode->i_mode))
inode->i_op = &nfs_symlink_inode_operations;
else
init_special_inode(inode, inode->i_mode, fattr->rdev);
nfsi->read_cache_jiffies = fattr->time_start;
nfsi->last_updated = jiffies;
inode->i_atime = fattr->atime;
inode->i_mtime = fattr->mtime;
inode->i_ctime = fattr->ctime;
if (fattr->valid & NFS_ATTR_FATTR_V4)
nfsi->change_attr = fattr->change_attr;
inode->i_size = nfs_size_to_loff_t(fattr->size);
inode->i_nlink = fattr->nlink;
inode->i_uid = fattr->uid;
inode->i_gid = fattr->gid;
if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
/*
* report the blocks in 512byte units
*/
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
inode->i_blksize = inode->i_sb->s_blocksize;
} else {
inode->i_blocks = fattr->du.nfs2.blocks;
inode->i_blksize = fattr->du.nfs2.blocksize;
}
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
nfsi->attrtimeo_timestamp = jiffies;
memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
nfsi->cache_access.cred = NULL;
unlock_new_inode(inode);
} else
nfs_refresh_inode(inode, fattr);
dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
atomic_read(&inode->i_count));
out:
return inode;
out_no_inode:
printk("nfs_fhget: iget failed\n");
goto out;
}
#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
int
nfs_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
struct nfs_fattr fattr;
int error;
if (attr->ia_valid & ATTR_SIZE) {
if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
attr->ia_valid &= ~ATTR_SIZE;
}
/* Optimization: if the end result is no change, don't RPC */
attr->ia_valid &= NFS_VALID_ATTRS;
if (attr->ia_valid == 0)
return 0;
lock_kernel();
nfs_begin_data_update(inode);
/* Write all dirty data if we're changing file permissions or size */
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
if (filemap_fdatawrite(inode->i_mapping) == 0)
filemap_fdatawait(inode->i_mapping);
nfs_wb_all(inode);
}
/*
* Return any delegations if we're going to change ACLs
*/
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
nfs_inode_return_delegation(inode);
error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
if (error == 0)
nfs_refresh_inode(inode, &fattr);
nfs_end_data_update(inode);
unlock_kernel();
return error;
}
/**
* nfs_setattr_update_inode - Update inode metadata after a setattr call.
* @inode: pointer to struct inode
* @attr: pointer to struct iattr
*
* Note: we do this in the *proc.c in order to ensure that
* it works for things like exclusive creates too.
*/
void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
{
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
if ((attr->ia_valid & ATTR_MODE) != 0) {
int mode = attr->ia_mode & S_IALLUGO;
mode |= inode->i_mode & ~S_IALLUGO;
inode->i_mode = mode;
}
if ((attr->ia_valid & ATTR_UID) != 0)
inode->i_uid = attr->ia_uid;
if ((attr->ia_valid & ATTR_GID) != 0)
inode->i_gid = attr->ia_gid;
spin_lock(&inode->i_lock);
NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
spin_unlock(&inode->i_lock);
}
if ((attr->ia_valid & ATTR_SIZE) != 0) {
inode->i_size = attr->ia_size;
vmtruncate(inode, attr->ia_size);
}
}
static int nfs_wait_schedule(void *word)
{
if (signal_pending(current))
return -ERESTARTSYS;
schedule();
return 0;
}
/*
* Wait for the inode to get unlocked.
*/
static int nfs_wait_on_inode(struct inode *inode)
{
struct rpc_clnt *clnt = NFS_CLIENT(inode);
struct nfs_inode *nfsi = NFS_I(inode);
sigset_t oldmask;
int error;
rpc_clnt_sigmask(clnt, &oldmask);
error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
nfs_wait_schedule, TASK_INTERRUPTIBLE);
rpc_clnt_sigunmask(clnt, &oldmask);
return error;
}
static void nfs_wake_up_inode(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
smp_mb__after_clear_bit();
wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
}
int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
struct inode *inode = dentry->d_inode;
int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
int err;
if (__IS_FLG(inode, MS_NOATIME))
need_atime = 0;
else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
need_atime = 0;
/* We may force a getattr if the user cares about atime */
if (need_atime)
err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
else
err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
if (!err)
generic_fillattr(inode, stat);
return err;
}
struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
{
struct nfs_open_context *ctx;
ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
if (ctx != NULL) {
atomic_set(&ctx->count, 1);
ctx->dentry = dget(dentry);
ctx->cred = get_rpccred(cred);
ctx->state = NULL;
ctx->lockowner = current->files;
ctx->error = 0;
ctx->dir_cookie = 0;
}
return ctx;
}
struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
{
if (ctx != NULL)
atomic_inc(&ctx->count);
return ctx;
}
void put_nfs_open_context(struct nfs_open_context *ctx)
{
if (atomic_dec_and_test(&ctx->count)) {
if (!list_empty(&ctx->list)) {
struct inode *inode = ctx->dentry->d_inode;
spin_lock(&inode->i_lock);
list_del(&ctx->list);
spin_unlock(&inode->i_lock);
}
if (ctx->state != NULL)
nfs4_close_state(ctx->state, ctx->mode);
if (ctx->cred != NULL)
put_rpccred(ctx->cred);
dput(ctx->dentry);
kfree(ctx);
}
}
/*
* Ensure that mmap has a recent RPC credential for use when writing out
* shared pages
*/
void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
{
struct inode *inode = filp->f_dentry->d_inode;
struct nfs_inode *nfsi = NFS_I(inode);
filp->private_data = get_nfs_open_context(ctx);
spin_lock(&inode->i_lock);
list_add(&ctx->list, &nfsi->open_files);
spin_unlock(&inode->i_lock);
}
/*
* Given an inode, search for an open context with the desired characteristics
*/
struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_open_context *pos, *ctx = NULL;
spin_lock(&inode->i_lock);
list_for_each_entry(pos, &nfsi->open_files, list) {
if (cred != NULL && pos->cred != cred)
continue;
if ((pos->mode & mode) == mode) {
ctx = get_nfs_open_context(pos);
break;
}
}
spin_unlock(&inode->i_lock);
return ctx;
}
void nfs_file_clear_open_context(struct file *filp)
{
struct inode *inode = filp->f_dentry->d_inode;
struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;
if (ctx) {
filp->private_data = NULL;
spin_lock(&inode->i_lock);
list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
spin_unlock(&inode->i_lock);
put_nfs_open_context(ctx);
}
}
/*
* These allocate and release file read/write context information.
*/
int nfs_open(struct inode *inode, struct file *filp)
{
struct nfs_open_context *ctx;
struct rpc_cred *cred;
cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
if (IS_ERR(cred))
return PTR_ERR(cred);
ctx = alloc_nfs_open_context(filp->f_dentry, cred);
put_rpccred(cred);
if (ctx == NULL)
return -ENOMEM;
ctx->mode = filp->f_mode;
nfs_file_set_open_context(filp, ctx);
put_nfs_open_context(ctx);
return 0;
}
int nfs_release(struct inode *inode, struct file *filp)
{
nfs_file_clear_open_context(filp);
return 0;
}
/*
* This function is called whenever some part of NFS notices that
* the cached attributes have to be refreshed.
*/
int
__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
int status = -ESTALE;
struct nfs_fattr fattr;
struct nfs_inode *nfsi = NFS_I(inode);
dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
inode->i_sb->s_id, (long long)NFS_FILEID(inode));
lock_kernel();
if (!inode || is_bad_inode(inode))
goto out_nowait;
if (NFS_STALE(inode))
goto out_nowait;
status = nfs_wait_on_inode(inode);
if (status < 0)
goto out;
if (NFS_STALE(inode)) {
status = -ESTALE;
/* Do we trust the cached ESTALE? */
if (NFS_ATTRTIMEO(inode) != 0) {
if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME)) {
/* no */
} else
goto out;
}
}
status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
if (status != 0) {
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode), status);
if (status == -ESTALE) {
nfs_zap_caches(inode);
if (!S_ISDIR(inode->i_mode))
set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
}
goto out;
}
spin_lock(&inode->i_lock);
status = nfs_update_inode(inode, &fattr);
if (status) {
spin_unlock(&inode->i_lock);
dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode), status);
goto out;
}
spin_unlock(&inode->i_lock);
nfs_revalidate_mapping(inode, inode->i_mapping);
if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
nfs_zap_acl_cache(inode);
dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode));
out:
nfs_wake_up_inode(inode);
out_nowait:
unlock_kernel();
return status;
}
int nfs_attribute_timeout(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
if (nfs_have_delegation(inode, FMODE_READ))
return 0;
return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
}
/**
* nfs_revalidate_inode - Revalidate the inode attributes
* @server - pointer to nfs_server struct
* @inode - pointer to inode struct
*
* Updates inode attribute information by retrieving the data from the server.
*/
int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
&& !nfs_attribute_timeout(inode))
return NFS_STALE(inode) ? -ESTALE : 0;
return __nfs_revalidate_inode(server, inode);
}
/**
* nfs_revalidate_mapping - Revalidate the pagecache
* @inode - pointer to host inode
* @mapping - pointer to mapping
*/
void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
{
struct nfs_inode *nfsi = NFS_I(inode);
if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
if (S_ISREG(inode->i_mode))
nfs_sync_mapping(mapping);
invalidate_inode_pages2(mapping);
spin_lock(&inode->i_lock);
nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
if (S_ISDIR(inode->i_mode)) {
memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
/* This ensures we revalidate child dentries */
nfsi->cache_change_attribute = jiffies;
}
spin_unlock(&inode->i_lock);
dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode));
}
}
/**
* nfs_begin_data_update
* @inode - pointer to inode
* Declare that a set of operations will update file data on the server
*/
void nfs_begin_data_update(struct inode *inode)
{
atomic_inc(&NFS_I(inode)->data_updates);
}
/**
* nfs_end_data_update
* @inode - pointer to inode
* Declare end of the operations that will update file data
* This will mark the inode as immediately needing revalidation
* of its attribute cache.
*/
void nfs_end_data_update(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
if (!nfs_have_delegation(inode, FMODE_READ)) {
/* Directories and symlinks: invalidate page cache */
if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
spin_lock(&inode->i_lock);
nfsi->cache_validity |= NFS_INO_INVALID_DATA;
spin_unlock(&inode->i_lock);
}
}
nfsi->cache_change_attribute = jiffies;
atomic_dec(&nfsi->data_updates);
}
/**
* nfs_check_inode_attributes - verify consistency of the inode attribute cache
* @inode - pointer to inode
* @fattr - updated attributes
*
* Verifies the attribute cache. If we have just changed the attributes,
* so that fattr carries weak cache consistency data, then it may
* also update the ctime/mtime/change_attribute.
*/
static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
loff_t cur_size, new_isize;
int data_unstable;
/* Are we in the process of updating data on the server? */
data_unstable = nfs_caches_unstable(inode);
if (fattr->valid & NFS_ATTR_FATTR_V4) {
if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
&& nfsi->change_attr == fattr->pre_change_attr)
nfsi->change_attr = fattr->change_attr;
if (nfsi->change_attr != fattr->change_attr) {
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
if (!data_unstable)
nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
}
}
if ((fattr->valid & NFS_ATTR_FATTR) == 0) {
return 0;
}
/* Has the inode gone and changed behind our back? */
if (nfsi->fileid != fattr->fileid
|| (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
return -EIO;
}
cur_size = i_size_read(inode);
new_isize = nfs_size_to_loff_t(fattr->size);
/* If we have atomic WCC data, we may update some attributes */
if ((fattr->valid & NFS_ATTR_WCC) != 0) {
if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
}
/* Verify a few of the more important attributes */
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
if (!data_unstable)
nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
}
if (cur_size != new_isize) {
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
if (nfsi->npages == 0)
nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
}
/* Have any file permissions changed? */
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
|| inode->i_uid != fattr->uid
|| inode->i_gid != fattr->gid)
nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
/* Has the link count changed? */
if (inode->i_nlink != fattr->nlink)
nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
if (!timespec_equal(&inode->i_atime, &fattr->atime))
nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
nfsi->read_cache_jiffies = fattr->time_start;
return 0;
}
/**
* nfs_refresh_inode - try to update the inode attribute cache
* @inode - pointer to inode
* @fattr - updated attributes
*
* Check that an RPC call that returned attributes has not overlapped with
* other recent updates of the inode metadata, then decide whether it is
* safe to do a full update of the inode attributes, or whether just to
* call nfs_check_inode_attributes.
*/
int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
int status;
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
return 0;
spin_lock(&inode->i_lock);
nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
if (time_after(fattr->time_start, nfsi->last_updated))
status = nfs_update_inode(inode, fattr);
else
status = nfs_check_inode_attributes(inode, fattr);
spin_unlock(&inode->i_lock);
return status;
}
/**
* nfs_post_op_update_inode - try to update the inode attribute cache
* @inode - pointer to inode
* @fattr - updated attributes
*
* After an operation that has changed the inode metadata, mark the
* attribute cache as being invalid, then try to update it.
*/
int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
int status = 0;
spin_lock(&inode->i_lock);
if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
goto out;
}
status = nfs_update_inode(inode, fattr);
out:
spin_unlock(&inode->i_lock);
return status;
}
/*
* Many nfs protocol calls return the new file attributes after
* an operation. Here we update the inode to reflect the state
* of the server's inode.
*
* This is a bit tricky because we have to make sure all dirty pages
* have been sent off to the server before calling invalidate_inode_pages.
* To make sure no other process adds more write requests while we try
* our best to flush them, we make them sleep during the attribute refresh.
*
* A very similar scenario holds for the dir cache.
*/
static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
loff_t cur_isize, new_isize;
unsigned int invalid = 0;
int data_stable;
dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
__FUNCTION__, inode->i_sb->s_id, inode->i_ino,
atomic_read(&inode->i_count), fattr->valid);
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
return 0;
if (nfsi->fileid != fattr->fileid) {
printk(KERN_ERR "%s: inode number mismatch\n"
"expected (%s/0x%Lx), got (%s/0x%Lx)\n",
__FUNCTION__,
inode->i_sb->s_id, (long long)nfsi->fileid,
inode->i_sb->s_id, (long long)fattr->fileid);
goto out_err;
}
/*
* Make sure the inode's type hasn't changed.
*/
if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
goto out_changed;
/*
* Update the read time so we don't revalidate too often.
*/
nfsi->read_cache_jiffies = fattr->time_start;
nfsi->last_updated = jiffies;
/* Are we racing with known updates of the metadata on the server? */
data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
if (data_stable)
nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
/* Check if our cached file size is stale */
new_isize = nfs_size_to_loff_t(fattr->size);
cur_isize = i_size_read(inode);
if (new_isize != cur_isize) {
/* Do we perhaps have any outstanding writes? */
if (nfsi->npages == 0) {
/* No, but did we race with nfs_end_data_update()? */
if (data_stable) {
inode->i_size = new_isize;
invalid |= NFS_INO_INVALID_DATA;
}
invalid |= NFS_INO_INVALID_ATTR;
} else if (new_isize > cur_isize) {
inode->i_size = new_isize;
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
}
nfsi->cache_change_attribute = jiffies;
dprintk("NFS: isize change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
}
/* Check if the mtime agrees */
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
dprintk("NFS: mtime change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
nfsi->cache_change_attribute = jiffies;
}
if ((fattr->valid & NFS_ATTR_FATTR_V4)
&& nfsi->change_attr != fattr->change_attr) {
dprintk("NFS: change_attr change on server for file %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
nfsi->change_attr = fattr->change_attr;
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
nfsi->cache_change_attribute = jiffies;
}
/* If ctime has changed we should definitely clear access+acl caches */
if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
nfsi->cache_change_attribute = jiffies;
}
memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
inode->i_uid != fattr->uid ||
inode->i_gid != fattr->gid)
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
inode->i_mode = fattr->mode;
inode->i_nlink = fattr->nlink;
inode->i_uid = fattr->uid;
inode->i_gid = fattr->gid;
if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
/*
* report the blocks in 512byte units
*/
inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
inode->i_blksize = inode->i_sb->s_blocksize;
} else {
inode->i_blocks = fattr->du.nfs2.blocks;
inode->i_blksize = fattr->du.nfs2.blocksize;
}
/* Update attrtimeo value if we're out of the unstable period */
if (invalid & NFS_INO_INVALID_ATTR) {
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
nfsi->attrtimeo_timestamp = jiffies;
} else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
nfsi->attrtimeo_timestamp = jiffies;
}
/* Don't invalidate the data if we were to blame */
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
|| S_ISLNK(inode->i_mode)))
invalid &= ~NFS_INO_INVALID_DATA;
if (data_stable)
invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
if (!nfs_have_delegation(inode, FMODE_READ))
nfsi->cache_validity |= invalid;
return 0;
out_changed:
/*
* Big trouble! The inode has become a different object.
*/
#ifdef NFS_PARANOIA
printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
__FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
#endif
out_err:
/*
* No need to worry about unhashing the dentry, as the
* lookup validation will know that the inode is bad.
* (But we fall through to invalidate the caches.)
*/
nfs_invalidate_inode(inode);
return -ESTALE;
}
/*
* File system information
*/
static int nfs_set_super(struct super_block *s, void *data)
{
s->s_fs_info = data;
return set_anon_super(s, data);
}
static int nfs_compare_super(struct super_block *sb, void *data)
{
struct nfs_server *server = data;
struct nfs_server *old = NFS_SB(sb);
if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
return 0;
if (old->addr.sin_port != server->addr.sin_port)
return 0;
return !nfs_compare_fh(&old->fh, &server->fh);
}
static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data)
{
int error;
struct nfs_server *server = NULL;
struct super_block *s;
struct nfs_fh *root;
struct nfs_mount_data *data = raw_data;
s = ERR_PTR(-EINVAL);
if (data == NULL) {
dprintk("%s: missing data argument\n", __FUNCTION__);
goto out_err;
}
if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
dprintk("%s: bad mount version\n", __FUNCTION__);
goto out_err;
}
switch (data->version) {
case 1:
data->namlen = 0;
case 2:
data->bsize = 0;
case 3:
if (data->flags & NFS_MOUNT_VER3) {
dprintk("%s: mount structure version %d does not support NFSv3\n",
__FUNCTION__,
data->version);
goto out_err;
}
data->root.size = NFS2_FHSIZE;
memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
case 4:
if (data->flags & NFS_MOUNT_SECFLAVOUR) {
dprintk("%s: mount structure version %d does not support strong security\n",
__FUNCTION__,
data->version);
goto out_err;
}
case 5:
memset(data->context, 0, sizeof(data->context));
}
#ifndef CONFIG_NFS_V3
/* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
s = ERR_PTR(-EPROTONOSUPPORT);
if (data->flags & NFS_MOUNT_VER3) {
dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
goto out_err;
}
#endif /* CONFIG_NFS_V3 */
s = ERR_PTR(-ENOMEM);
server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
if (!server)
goto out_err;
memset(server, 0, sizeof(struct nfs_server));
/* Zero out the NFS state stuff */
init_nfsv4_state(server);
server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
root = &server->fh;
if (data->flags & NFS_MOUNT_VER3)
root->size = data->root.size;
else
root->size = NFS2_FHSIZE;
s = ERR_PTR(-EINVAL);
if (root->size > sizeof(root->data)) {
dprintk("%s: invalid root filehandle\n", __FUNCTION__);
goto out_err;
}
memcpy(root->data, data->root.data, root->size);
/* We now require that the mount process passes the remote address */
memcpy(&server->addr, &data->addr, sizeof(server->addr));
if (server->addr.sin_addr.s_addr == INADDR_ANY) {
dprintk("%s: mount program didn't pass remote address!\n",
__FUNCTION__);
goto out_err;
}
/* Fire up rpciod if not yet running */
s = ERR_PTR(rpciod_up());
if (IS_ERR(s)) {
dprintk("%s: couldn't start rpciod! Error = %ld\n",
__FUNCTION__, PTR_ERR(s));
goto out_err;
}
s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
if (IS_ERR(s) || s->s_root)
goto out_rpciod_down;
s->s_flags = flags;
error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
if (error) {
up_write(&s->s_umount);
deactivate_super(s);
return ERR_PTR(error);
}
s->s_flags |= MS_ACTIVE;
return s;
out_rpciod_down:
rpciod_down();
out_err:
kfree(server);
return s;
}
static void nfs_kill_super(struct super_block *s)
{
struct nfs_server *server = NFS_SB(s);
kill_anon_super(s);
if (!IS_ERR(server->client))
rpc_shutdown_client(server->client);
if (!IS_ERR(server->client_sys))
rpc_shutdown_client(server->client_sys);
if (!IS_ERR(server->client_acl))
rpc_shutdown_client(server->client_acl);
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_down(); /* release rpc.lockd */
rpciod_down(); /* release rpciod */
kfree(server->hostname);
kfree(server);
}
static struct file_system_type nfs_fs_type = {
.owner = THIS_MODULE,
.name = "nfs",
.get_sb = nfs_get_sb,
.kill_sb = nfs_kill_super,
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
#ifdef CONFIG_NFS_V4
static void nfs4_clear_inode(struct inode *);
static struct super_operations nfs4_sops = {
.alloc_inode = nfs_alloc_inode,
.destroy_inode = nfs_destroy_inode,
.write_inode = nfs_write_inode,
.delete_inode = nfs_delete_inode,
.statfs = nfs_statfs,
.clear_inode = nfs4_clear_inode,
.umount_begin = nfs_umount_begin,
.show_options = nfs_show_options,
};
/*
* Clean out any remaining NFSv4 state that might be left over due
* to open() calls that passed nfs_atomic_lookup, but failed to call
* nfs_open().
*/
static void nfs4_clear_inode(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
/* If we are holding a delegation, return it! */
nfs_inode_return_delegation(inode);
/* First call standard NFS clear_inode() code */
nfs_clear_inode(inode);
/* Now clear out any remaining state */
while (!list_empty(&nfsi->open_states)) {
struct nfs4_state *state;
state = list_entry(nfsi->open_states.next,
struct nfs4_state,
inode_states);
dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
__FUNCTION__,
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
state);
BUG_ON(atomic_read(&state->count) != 1);
nfs4_close_state(state, state->state);
}
}
static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
{
struct nfs_server *server;
struct nfs4_client *clp = NULL;
struct rpc_xprt *xprt = NULL;
struct rpc_clnt *clnt = NULL;
struct rpc_timeout timeparms;
rpc_authflavor_t authflavour;
int err = -EIO;
sb->s_blocksize_bits = 0;
sb->s_blocksize = 0;
server = NFS_SB(sb);
if (data->rsize != 0)
server->rsize = nfs_block_size(data->rsize, NULL);
if (data->wsize != 0)
server->wsize = nfs_block_size(data->wsize, NULL);
server->flags = data->flags & NFS_MOUNT_FLAGMASK;
server->caps = NFS_CAP_ATOMIC_OPEN;
server->acregmin = data->acregmin*HZ;
server->acregmax = data->acregmax*HZ;
server->acdirmin = data->acdirmin*HZ;
server->acdirmax = data->acdirmax*HZ;
server->rpc_ops = &nfs_v4_clientops;
nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
clp = nfs4_get_client(&server->addr.sin_addr);
if (!clp) {
dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
return -EIO;
}
/* Now create transport and client */
authflavour = RPC_AUTH_UNIX;
if (data->auth_flavourlen != 0) {
if (data->auth_flavourlen != 1) {
dprintk("%s: Invalid number of RPC auth flavours %d.\n",
__FUNCTION__, data->auth_flavourlen);
err = -EINVAL;
goto out_fail;
}
if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
err = -EFAULT;
goto out_fail;
}
}
down_write(&clp->cl_sem);
if (IS_ERR(clp->cl_rpcclient)) {
xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
if (IS_ERR(xprt)) {
up_write(&clp->cl_sem);
err = PTR_ERR(xprt);
dprintk("%s: cannot create RPC transport. Error = %d\n",
__FUNCTION__, err);
goto out_fail;
}
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
server->rpc_ops->version, authflavour);
if (IS_ERR(clnt)) {
up_write(&clp->cl_sem);
err = PTR_ERR(clnt);
dprintk("%s: cannot create RPC client. Error = %d\n",
__FUNCTION__, err);
goto out_fail;
}
clnt->cl_intr = 1;
clnt->cl_softrtry = 1;
clnt->cl_chatty = 1;
clp->cl_rpcclient = clnt;
clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
if (IS_ERR(clp->cl_cred)) {
up_write(&clp->cl_sem);
err = PTR_ERR(clp->cl_cred);
clp->cl_cred = NULL;
goto out_fail;
}
memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
nfs_idmap_new(clp);
}
if (list_empty(&clp->cl_superblocks)) {
err = nfs4_init_client(clp);
if (err != 0) {
up_write(&clp->cl_sem);
goto out_fail;
}
}
list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
clnt = rpc_clone_client(clp->cl_rpcclient);
if (!IS_ERR(clnt))
server->nfs4_state = clp;
up_write(&clp->cl_sem);
clp = NULL;
if (IS_ERR(clnt)) {
err = PTR_ERR(clnt);
dprintk("%s: cannot create RPC client. Error = %d\n",
__FUNCTION__, err);
return err;
}
server->client = clnt;
if (server->nfs4_state->cl_idmap == NULL) {
dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
return -ENOMEM;
}
if (clnt->cl_auth->au_flavor != authflavour) {
struct rpc_auth *auth;
auth = rpcauth_create(authflavour, clnt);
if (IS_ERR(auth)) {
dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
return PTR_ERR(auth);
}
}
sb->s_time_gran = 1;
sb->s_op = &nfs4_sops;
err = nfs_sb_init(sb, authflavour);
if (err == 0)
return 0;
out_fail:
if (clp)
nfs4_put_client(clp);
return err;
}
static int nfs4_compare_super(struct super_block *sb, void *data)
{
struct nfs_server *server = data;
struct nfs_server *old = NFS_SB(sb);
if (strcmp(server->hostname, old->hostname) != 0)
return 0;
if (strcmp(server->mnt_path, old->mnt_path) != 0)
return 0;
return 1;
}
static void *
nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
{
void *p = NULL;
if (!src->len)
return ERR_PTR(-EINVAL);
if (src->len < maxlen)
maxlen = src->len;
if (dst == NULL) {
p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
if (p == NULL)
return ERR_PTR(-ENOMEM);
}
if (copy_from_user(dst, src->data, maxlen)) {
kfree(p);
return ERR_PTR(-EFAULT);
}
dst[maxlen] = '\0';
return dst;
}
static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data)
{
int error;
struct nfs_server *server;
struct super_block *s;
struct nfs4_mount_data *data = raw_data;
void *p;
if (data == NULL) {
dprintk("%s: missing data argument\n", __FUNCTION__);
return ERR_PTR(-EINVAL);
}
if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
dprintk("%s: bad mount version\n", __FUNCTION__);
return ERR_PTR(-EINVAL);
}
server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
if (!server)
return ERR_PTR(-ENOMEM);
memset(server, 0, sizeof(struct nfs_server));
/* Zero out the NFS state stuff */
init_nfsv4_state(server);
server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
p = nfs_copy_user_string(NULL, &data->hostname, 256);
if (IS_ERR(p))
goto out_err;
server->hostname = p;
p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
if (IS_ERR(p))
goto out_err;
server->mnt_path = p;
p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
sizeof(server->ip_addr) - 1);
if (IS_ERR(p))
goto out_err;
/* We now require that the mount process passes the remote address */
if (data->host_addrlen != sizeof(server->addr)) {
s = ERR_PTR(-EINVAL);
goto out_free;
}
if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
s = ERR_PTR(-EFAULT);
goto out_free;
}
if (server->addr.sin_family != AF_INET ||
server->addr.sin_addr.s_addr == INADDR_ANY) {
dprintk("%s: mount program didn't pass remote IP address!\n",
__FUNCTION__);
s = ERR_PTR(-EINVAL);
goto out_free;
}
/* Fire up rpciod if not yet running */
s = ERR_PTR(rpciod_up());
if (IS_ERR(s)) {
dprintk("%s: couldn't start rpciod! Error = %ld\n",
__FUNCTION__, PTR_ERR(s));
goto out_free;
}
s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
if (IS_ERR(s) || s->s_root)
goto out_free;
s->s_flags = flags;
error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
if (error) {
up_write(&s->s_umount);
deactivate_super(s);
return ERR_PTR(error);
}
s->s_flags |= MS_ACTIVE;
return s;
out_err:
s = (struct super_block *)p;
out_free:
kfree(server->mnt_path);
kfree(server->hostname);
kfree(server);
return s;
}
static void nfs4_kill_super(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
nfs_return_all_delegations(sb);
kill_anon_super(sb);
nfs4_renewd_prepare_shutdown(server);
if (server->client != NULL && !IS_ERR(server->client))
rpc_shutdown_client(server->client);
rpciod_down(); /* release rpciod */
destroy_nfsv4_state(server);
kfree(server->hostname);
kfree(server);
}
static struct file_system_type nfs4_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
.get_sb = nfs4_get_sb,
.kill_sb = nfs4_kill_super,
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
#define nfs4_init_once(nfsi) \
do { \
INIT_LIST_HEAD(&(nfsi)->open_states); \
nfsi->delegation = NULL; \
nfsi->delegation_state = 0; \
init_rwsem(&nfsi->rwsem); \
} while(0)
#define register_nfs4fs() register_filesystem(&nfs4_fs_type)
#define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
#else
#define nfs4_init_once(nfsi) \
do { } while (0)
#define register_nfs4fs() (0)
#define unregister_nfs4fs()
#endif
extern int nfs_init_nfspagecache(void);
extern void nfs_destroy_nfspagecache(void);
extern int nfs_init_readpagecache(void);
extern void nfs_destroy_readpagecache(void);
extern int nfs_init_writepagecache(void);
extern void nfs_destroy_writepagecache(void);
#ifdef CONFIG_NFS_DIRECTIO
extern int nfs_init_directcache(void);
extern void nfs_destroy_directcache(void);
#endif
static kmem_cache_t * nfs_inode_cachep;
static struct inode *nfs_alloc_inode(struct super_block *sb)
{
struct nfs_inode *nfsi;
nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
if (!nfsi)
return NULL;
nfsi->flags = 0UL;
nfsi->cache_validity = 0UL;
nfsi->cache_change_attribute = jiffies;
#ifdef CONFIG_NFS_V3_ACL
nfsi->acl_access = ERR_PTR(-EAGAIN);
nfsi->acl_default = ERR_PTR(-EAGAIN);
#endif
#ifdef CONFIG_NFS_V4
nfsi->nfs4_acl = NULL;
#endif /* CONFIG_NFS_V4 */
return &nfsi->vfs_inode;
}
static void nfs_destroy_inode(struct inode *inode)
{
kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
}
static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
{
struct nfs_inode *nfsi = (struct nfs_inode *) foo;
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR) {
inode_init_once(&nfsi->vfs_inode);
spin_lock_init(&nfsi->req_lock);
INIT_LIST_HEAD(&nfsi->dirty);
INIT_LIST_HEAD(&nfsi->commit);
INIT_LIST_HEAD(&nfsi->open_files);
INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
atomic_set(&nfsi->data_updates, 0);
nfsi->ndirty = 0;
nfsi->ncommit = 0;
nfsi->npages = 0;
nfs4_init_once(nfsi);
}
}
static int nfs_init_inodecache(void)
{
nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
sizeof(struct nfs_inode),
0, SLAB_RECLAIM_ACCOUNT,
init_once, NULL);
if (nfs_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void nfs_destroy_inodecache(void)
{
if (kmem_cache_destroy(nfs_inode_cachep))
printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
}
/*
* Initialize NFS
*/
static int __init init_nfs_fs(void)
{
int err;
err = nfs_init_nfspagecache();
if (err)
goto out4;
err = nfs_init_inodecache();
if (err)
goto out3;
err = nfs_init_readpagecache();
if (err)
goto out2;
err = nfs_init_writepagecache();
if (err)
goto out1;
#ifdef CONFIG_NFS_DIRECTIO
err = nfs_init_directcache();
if (err)
goto out0;
#endif
#ifdef CONFIG_PROC_FS
rpc_proc_register(&nfs_rpcstat);
#endif
err = register_filesystem(&nfs_fs_type);
if (err)
goto out;
if ((err = register_nfs4fs()) != 0)
goto out;
return 0;
out:
#ifdef CONFIG_PROC_FS
rpc_proc_unregister("nfs");
#endif
nfs_destroy_writepagecache();
#ifdef CONFIG_NFS_DIRECTIO
out0:
nfs_destroy_directcache();
#endif
out1:
nfs_destroy_readpagecache();
out2:
nfs_destroy_inodecache();
out3:
nfs_destroy_nfspagecache();
out4:
return err;
}
static void __exit exit_nfs_fs(void)
{
#ifdef CONFIG_NFS_DIRECTIO
nfs_destroy_directcache();
#endif
nfs_destroy_writepagecache();
nfs_destroy_readpagecache();
nfs_destroy_inodecache();
nfs_destroy_nfspagecache();
#ifdef CONFIG_PROC_FS
rpc_proc_unregister("nfs");
#endif
unregister_filesystem(&nfs_fs_type);
unregister_nfs4fs();
}
/* Not quite true; I just maintain it */
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");
module_init(init_nfs_fs)
module_exit(exit_nfs_fs)
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