Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2003 insertions, 0 deletions

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
new file mode 100644
index 0000000..6345f26
--- /dev/null
+++ b/fs/nfs/inode.c
@@ -0,0 +1,2003 @@
+/*
+ *  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 "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 *, unsigned long);
+
+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 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",
+};
+
+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, 0, 0, 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);
+
+	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);
+}
+
+/*
+ * For the moment, the only task for the NFS clear_inode method is to
+ * release the mmap credential
+ */
+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));
+	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 nfs_server *server = NFS_SB(sb);
+	struct rpc_clnt	*rpc;
+
+	/* -EIO all pending I/O */
+	if ((rpc = server->client) != NULL)
+		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;
+}
+
+/*
+ * 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			tcp   = (data->flags & NFS_MOUNT_TCP);
+
+	/* Initialize timeout values */
+	timeparms.to_initval = data->timeo * HZ / 10;
+	timeparms.to_retries = data->retrans;
+	timeparms.to_maxval  = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT;
+	timeparms.to_exponential = 1;
+
+	if (!timeparms.to_initval)
+		timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10;
+	if (!timeparms.to_retries)
+		timeparms.to_retries = 5;
+
+	/* create transport and client */
+	xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP,
+				 &server->addr, &timeparms);
+	if (IS_ERR(xprt)) {
+		printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
+		return (struct rpc_clnt *)xprt;
+	}
+	clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
+				 server->rpc_ops->version, data->pseudoflavor);
+	if (IS_ERR(clnt)) {
+		printk(KERN_WARNING "NFS: cannot create RPC client.\n");
+		goto out_fail;
+	}
+
+	clnt->cl_intr     = 1;
+	clnt->cl_softrtry = 1;
+	clnt->cl_chatty   = 1;
+
+	return clnt;
+
+out_fail:
+	xprt_destroy(xprt);
+	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. */
+	if (server->flags & NFS_MOUNT_VER3) {
+#ifdef CONFIG_NFS_V3
+		server->rpc_ops = &nfs_v3_clientops;
+		server->caps |= NFS_CAP_READDIRPLUS;
+		if (data->version < 4) {
+			printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n");
+			return -EIO;
+		}
+#else
+		printk(KERN_NOTICE "NFS: NFSv3 not supported.\n");
+		return -EIO;
+#endif
+	} else {
+		server->rpc_ops = &nfs_v2_clientops;
+	}
+
+	/* 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) {
+		server->client_sys = rpc_clone_client(server->client);
+		if (IS_ERR(server->client_sys))
+			return PTR_ERR(server->client_sys);
+		if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys))
+			return -ENOMEM;
+	} else {
+		atomic_inc(&server->client->cl_count);
+		server->client_sys = server->client;
+	}
+
+	if (server->flags & NFS_MOUNT_VER3) {
+		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_TCP, ",tcp", ",udp" },
+		{ NFS_MOUNT_NOCTO, ",nocto", "" },
+		{ NFS_MOUNT_NOAC, ",noac", "" },
+		{ NFS_MOUNT_NONLM, ",nolock", ",lock" },
+		{ 0, NULL, NULL }
+	};
+	struct proc_nfs_info *nfs_infop;
+	struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
+
+	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);
+	}
+	seq_puts(m, ",addr=");
+	seq_escape(m, nfss->hostname, " \t\n\\");
+	return 0;
+}
+
+/*
+ * Invalidate the local caches
+ */
+void
+nfs_zap_caches(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->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS;
+	else
+		nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
+}
+
+/*
+ * Invalidate, but do not unhash, the inode
+ */
+static void
+nfs_invalidate_inode(struct inode *inode)
+{
+	umode_t save_mode = inode->i_mode;
+
+	make_bad_inode(inode);
+	inode->i_mode = save_mode;
+	nfs_zap_caches(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_file_inode_operations;
+		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)
+				NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS;
+		} 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->timestamp;
+		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);
+	}
+	error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
+	if (error == 0) {
+		nfs_refresh_inode(inode, &fattr);
+		if ((attr->ia_valid & ATTR_MODE) != 0) {
+			int mode;
+			mode = inode->i_mode & ~S_IALLUGO;
+			mode |= attr->ia_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;
+		if ((attr->ia_valid & ATTR_SIZE) != 0) {
+			inode->i_size = attr->ia_size;
+			vmtruncate(inode, attr->ia_size);
+		}
+	}
+	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
+		NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS;
+	nfs_end_data_update(inode);
+	unlock_kernel();
+	return error;
+}
+
+/*
+ * Wait for the inode to get unlocked.
+ * (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING).
+ */
+static int
+nfs_wait_on_inode(struct inode *inode, int flag)
+{
+	struct rpc_clnt	*clnt = NFS_CLIENT(inode);
+	struct nfs_inode *nfsi = NFS_I(inode);
+
+	int error;
+	if (!(NFS_FLAGS(inode) & flag))
+		return 0;
+	atomic_inc(&inode->i_count);
+	error = nfs_wait_event(clnt, nfsi->nfs_i_wait,
+				!(NFS_FLAGS(inode) & flag));
+	iput(inode);
+	return error;
+}
+
+int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+	struct inode *inode = dentry->d_inode;
+	struct nfs_inode *nfsi = NFS_I(inode);
+	int need_atime = nfsi->flags & 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;
+		init_waitqueue_head(&ctx->waitq);
+	}
+	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);
+}
+
+struct nfs_open_context *nfs_find_open_context(struct inode *inode, 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 ((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);
+	if ((filp->f_mode & FMODE_WRITE) != 0)
+		nfs_begin_data_update(inode);
+	return 0;
+}
+
+int nfs_release(struct inode *inode, struct file *filp)
+{
+	if ((filp->f_mode & FMODE_WRITE) != 0)
+		nfs_end_data_update(inode);
+	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);
+	unsigned long verifier;
+	unsigned int flags;
+
+	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;
+
+	while (NFS_REVALIDATING(inode)) {
+		status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING);
+		if (status < 0)
+			goto out_nowait;
+		if (NFS_ATTRTIMEO(inode) == 0)
+			continue;
+		if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME))
+			continue;
+		status = NFS_STALE(inode) ? -ESTALE : 0;
+		goto out_nowait;
+	}
+	NFS_FLAGS(inode) |= NFS_INO_REVALIDATING;
+
+	/* Protect against RPC races by saving the change attribute */
+	verifier = nfs_save_change_attribute(inode);
+	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))
+				NFS_FLAGS(inode) |= NFS_INO_STALE;
+		}
+		goto out;
+	}
+
+	status = nfs_update_inode(inode, &fattr, verifier);
+	if (status) {
+		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;
+	}
+	flags = nfsi->flags;
+	/*
+	 * We may need to keep the attributes marked as invalid if
+	 * we raced with nfs_end_attr_update().
+	 */
+	if (verifier == nfsi->cache_change_attribute)
+		nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
+	/* Do the page cache invalidation */
+	if (flags & NFS_INO_INVALID_DATA) {
+		if (S_ISREG(inode->i_mode)) {
+			if (filemap_fdatawrite(inode->i_mapping) == 0)
+				filemap_fdatawait(inode->i_mapping);
+			nfs_wb_all(inode);
+		}
+		nfsi->flags &= ~NFS_INO_INVALID_DATA;
+		invalidate_inode_pages2(inode->i_mapping);
+		memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
+		dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
+				inode->i_sb->s_id,
+				(long long)NFS_FILEID(inode));
+		/* This ensures we revalidate dentries */
+		nfsi->cache_change_attribute++;
+	}
+	dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
+		inode->i_sb->s_id,
+		(long long)NFS_FILEID(inode));
+
+out:
+	NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING;
+	wake_up(&nfsi->nfs_i_wait);
+ 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_FLAGS(inode) & (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_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)) {
+		/* Mark the attribute cache for revalidation */
+		nfsi->flags |= NFS_INO_INVALID_ATTR;
+		/* Directories and symlinks: invalidate page cache too */
+		if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
+			nfsi->flags |= NFS_INO_INVALID_DATA;
+	}
+	nfsi->cache_change_attribute ++;
+	atomic_dec(&nfsi->data_updates);
+}
+
+/**
+ * nfs_end_data_update_defer
+ * @inode - pointer to inode
+ * Declare end of the operations that will update file data
+ * This will defer marking the inode as needing revalidation
+ * unless there are no other pending updates.
+ */
+void nfs_end_data_update_defer(struct inode *inode)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+
+	if (atomic_dec_and_test(&nfsi->data_updates)) {
+		/* Mark the attribute cache for revalidation */
+		nfsi->flags |= NFS_INO_INVALID_ATTR;
+		/* Directories and symlinks: invalidate page cache too */
+		if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
+			nfsi->flags |= NFS_INO_INVALID_DATA;
+		nfsi->cache_change_attribute ++;
+	}
+}
+
+/**
+ * nfs_refresh_inode - 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.
+ */
+int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+	loff_t cur_size, new_isize;
+	int data_unstable;
+
+	/* Do we hold a delegation? */
+	if (nfs_have_delegation(inode, FMODE_READ))
+		return 0;
+
+	/* 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 (!data_unstable && nfsi->change_attr != fattr->change_attr)
+			nfsi->flags |= NFS_INO_INVALID_ATTR;
+	}
+
+	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 (!data_unstable) {
+		if (!timespec_equal(&inode->i_mtime, &fattr->mtime)
+				|| cur_size != new_isize)
+			nfsi->flags |= NFS_INO_INVALID_ATTR;
+	} else if (S_ISREG(inode->i_mode) && new_isize > cur_size)
+			nfsi->flags |= NFS_INO_INVALID_ATTR;
+
+	/* 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->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
+
+	/* Has the link count changed? */
+	if (inode->i_nlink != fattr->nlink)
+		nfsi->flags |= NFS_INO_INVALID_ATTR;
+
+	if (!timespec_equal(&inode->i_atime, &fattr->atime))
+		nfsi->flags |= NFS_INO_INVALID_ATIME;
+
+	nfsi->read_cache_jiffies = fattr->timestamp;
+	return 0;
+}
+
+/*
+ * 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, unsigned long verifier)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+	__u64		new_size;
+	loff_t		new_isize;
+	unsigned int	invalid = 0;
+	loff_t		cur_isize;
+	int data_unstable;
+
+	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->timestamp;
+
+	/* Are we racing with known updates of the metadata on the server? */
+	data_unstable = ! nfs_verify_change_attribute(inode, verifier);
+
+	/* Check if the file size agrees */
+	new_size = fattr->size;
+ 	new_isize = nfs_size_to_loff_t(fattr->size);
+	cur_isize = i_size_read(inode);
+	if (cur_isize != new_size) {
+#ifdef NFS_DEBUG_VERBOSE
+		printk(KERN_DEBUG "NFS: isize change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
+#endif
+		/*
+		 * If we have pending writebacks, things can get
+		 * messy.
+		 */
+		if (S_ISREG(inode->i_mode) && data_unstable) {
+			if (new_isize > cur_isize) {
+				inode->i_size = new_isize;
+				invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
+			}
+		} else {
+			inode->i_size = new_isize;
+			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
+		}
+	}
+
+	/*
+	 * Note: we don't check inode->i_mtime since pipes etc.
+	 *       can change this value in VFS without requiring a
+	 *	 cache revalidation.
+	 */
+	if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
+		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
+#ifdef NFS_DEBUG_VERBOSE
+		printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
+#endif
+		if (!data_unstable)
+			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
+	}
+
+	if ((fattr->valid & NFS_ATTR_FATTR_V4)
+	    && nfsi->change_attr != fattr->change_attr) {
+#ifdef NFS_DEBUG_VERBOSE
+		printk(KERN_DEBUG "NFS: change_attr change on %s/%ld\n",
+		       inode->i_sb->s_id, inode->i_ino);
+#endif
+		nfsi->change_attr = fattr->change_attr;
+		if (!data_unstable)
+			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS;
+	}
+
+	memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
+	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;
+
+	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 (!nfs_have_delegation(inode, FMODE_READ))
+		nfsi->flags |= 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
+	/*
+	 * 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);
+ out_err:
+	NFS_FLAGS(inode) |= NFS_INO_STALE;
+	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;
+	struct super_block *s;
+	struct nfs_fh *root;
+	struct nfs_mount_data *data = raw_data;
+
+	if (!data) {
+		printk("nfs_read_super: missing data argument\n");
+		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);
+
+	if (data->version != NFS_MOUNT_VERSION) {
+		printk("nfs warning: mount version %s than kernel\n",
+			data->version < NFS_MOUNT_VERSION ? "older" : "newer");
+		if (data->version < 2)
+			data->namlen = 0;
+		if (data->version < 3)
+			data->bsize  = 0;
+		if (data->version < 4) {
+			data->flags &= ~NFS_MOUNT_VER3;
+			data->root.size = NFS2_FHSIZE;
+			memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
+		}
+		if (data->version < 5)
+			data->flags &= ~NFS_MOUNT_SECFLAVOUR;
+	}
+
+	root = &server->fh;
+	if (data->flags & NFS_MOUNT_VER3)
+		root->size = data->root.size;
+	else
+		root->size = NFS2_FHSIZE;
+	if (root->size > sizeof(root->data)) {
+		printk("nfs_get_sb: invalid root filehandle\n");
+		kfree(server);
+		return ERR_PTR(-EINVAL);
+	}
+	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) {
+		printk("NFS: mount program didn't pass remote address!\n");
+		kfree(server);
+		return ERR_PTR(-EINVAL);
+	}
+
+	s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
+
+	if (IS_ERR(s) || s->s_root) {
+		kfree(server);
+		return s;
+	}
+
+	s->s_flags = flags;
+
+	/* Fire up rpciod if not yet running */
+	if (rpciod_up() != 0) {
+		printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
+		kfree(server);
+		return ERR_PTR(-EIO);
+	}
+
+	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;
+}
+
+static void nfs_kill_super(struct super_block *s)
+{
+	struct nfs_server *server = NFS_SB(s);
+
+	kill_anon_super(s);
+
+	if (server->client != NULL && !IS_ERR(server->client))
+		rpc_shutdown_client(server->client);
+	if (server->client_sys != NULL && !IS_ERR(server->client_sys))
+		rpc_shutdown_client(server->client_sys);
+
+	if (!(server->flags & NFS_MOUNT_NONLM))
+		lockd_down();	/* release rpc.lockd */
+
+	rpciod_down();		/* release rpciod */
+
+	if (server->hostname != NULL)
+		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! */
+	if (nfsi->delegation != NULL)
+		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 proto, 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;
+	/* Initialize timeout values */
+
+	timeparms.to_initval = data->timeo * HZ / 10;
+	timeparms.to_retries = data->retrans;
+	timeparms.to_exponential = 1;
+	if (!timeparms.to_retries)
+		timeparms.to_retries = 5;
+
+	proto = data->proto;
+	/* Which IP protocol do we use? */
+	switch (proto) {
+	case IPPROTO_TCP:
+		timeparms.to_maxval  = RPC_MAX_TCP_TIMEOUT;
+		if (!timeparms.to_initval)
+			timeparms.to_initval = 600 * HZ / 10;
+		break;
+	case IPPROTO_UDP:
+		timeparms.to_maxval  = RPC_MAX_UDP_TIMEOUT;
+		if (!timeparms.to_initval)
+			timeparms.to_initval = 11 * HZ / 10;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	clp = nfs4_get_client(&server->addr.sin_addr);
+	if (!clp) {
+		printk(KERN_WARNING "NFS: failed to create NFS4 client.\n");
+		return -EIO;
+	}
+
+	/* Now create transport and client */
+	authflavour = RPC_AUTH_UNIX;
+	if (data->auth_flavourlen != 0) {
+		if (data->auth_flavourlen > 1)
+			printk(KERN_INFO "NFS: cannot yet deal with multiple auth flavours.\n");
+		if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
+			err = -EFAULT;
+			goto out_fail;
+		}
+	}
+
+	down_write(&clp->cl_sem);
+	if (clp->cl_rpcclient == NULL) {
+		xprt = xprt_create_proto(proto, &server->addr, &timeparms);
+		if (IS_ERR(xprt)) {
+			up_write(&clp->cl_sem);
+			printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
+			err = PTR_ERR(xprt);
+			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);
+			printk(KERN_WARNING "NFS: cannot create RPC client.\n");
+			xprt_destroy(xprt);
+			err = PTR_ERR(clnt);
+			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)) {
+		printk(KERN_WARNING "NFS: cannot create RPC client.\n");
+		return PTR_ERR(clnt);
+	}
+
+	server->client    = clnt;
+
+	if (server->nfs4_state->cl_idmap == NULL) {
+		printk(KERN_WARNING "NFS: failed to create idmapper.\n");
+		return -ENOMEM;
+	}
+
+	if (clnt->cl_auth->au_flavor != authflavour) {
+		if (rpcauth_create(authflavour, clnt) == NULL) {
+			printk(KERN_WARNING "NFS: couldn't create credcache!\n");
+			return -ENOMEM;
+		}
+	}
+
+	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)) {
+		if (p != NULL)
+			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) {
+		printk("nfs_read_super: missing data argument\n");
+		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);
+
+	if (data->version != NFS4_MOUNT_VERSION) {
+		printk("nfs warning: mount version %s than kernel\n",
+			data->version < NFS4_MOUNT_VERSION ? "older" : "newer");
+	}
+
+	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) {
+		printk("NFS: mount program didn't pass remote IP address!\n");
+		s = ERR_PTR(-EINVAL);
+		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;
+
+	/* Fire up rpciod if not yet running */
+	if (rpciod_up() != 0) {
+		printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
+		s = ERR_PTR(-EIO);
+		goto out_free;
+	}
+
+	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:
+	if (server->mnt_path)
+		kfree(server->mnt_path);
+	if (server->hostname)
+		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);
+
+	if (server->hostname != NULL)
+		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 = 0;
+	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;
+		init_waitqueue_head(&nfsi->nfs_i_wait);
+		nfs4_init_once(nfsi);
+	}
+}
+ 
+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;
+}
+
+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)