Linux-2.6.12-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, 1859 insertions, 0 deletions

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
new file mode 100644
index 000000000000..e3e9d217236e
--- /dev/null
+++ b/fs/nfsd/vfs.c
@@ -0,0 +1,1859 @@
+#define MSNFS	/* HACK HACK */
+/*
+ * linux/fs/nfsd/vfs.c
+ *
+ * File operations used by nfsd. Some of these have been ripped from
+ * other parts of the kernel because they weren't exported, others
+ * are partial duplicates with added or changed functionality.
+ *
+ * Note that several functions dget() the dentry upon which they want
+ * to act, most notably those that create directory entries. Response
+ * dentry's are dput()'d if necessary in the release callback.
+ * So if you notice code paths that apparently fail to dput() the
+ * dentry, don't worry--they have been taken care of.
+ *
+ * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de>
+ * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp>
+ */
+
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/mount.h>
+#include <linux/major.h>
+#include <linux/ext2_fs.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/net.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/pagemap.h>
+#include <linux/in.h>
+#include <linux/module.h>
+#include <linux/namei.h>
+#include <linux/vfs.h>
+#include <linux/delay.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/nfsd/nfsd.h>
+#ifdef CONFIG_NFSD_V3
+#include <linux/nfs3.h>
+#include <linux/nfsd/xdr3.h>
+#endif /* CONFIG_NFSD_V3 */
+#include <linux/nfsd/nfsfh.h>
+#include <linux/quotaops.h>
+#include <linux/dnotify.h>
+#ifdef CONFIG_NFSD_V4
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/xattr_acl.h>
+#include <linux/xattr.h>
+#include <linux/nfs4.h>
+#include <linux/nfs4_acl.h>
+#include <linux/nfsd_idmap.h>
+#include <linux/security.h>
+#endif /* CONFIG_NFSD_V4 */
+
+#include <asm/uaccess.h>
+
+#define NFSDDBG_FACILITY		NFSDDBG_FILEOP
+#define NFSD_PARANOIA
+
+
+/* We must ignore files (but only files) which might have mandatory
+ * locks on them because there is no way to know if the accesser has
+ * the lock.
+ */
+#define IS_ISMNDLK(i)	(S_ISREG((i)->i_mode) && MANDATORY_LOCK(i))
+
+/*
+ * This is a cache of readahead params that help us choose the proper
+ * readahead strategy. Initially, we set all readahead parameters to 0
+ * and let the VFS handle things.
+ * If you increase the number of cached files very much, you'll need to
+ * add a hash table here.
+ */
+struct raparms {
+	struct raparms		*p_next;
+	unsigned int		p_count;
+	ino_t			p_ino;
+	dev_t			p_dev;
+	int			p_set;
+	struct file_ra_state	p_ra;
+};
+
+static struct raparms *		raparml;
+static struct raparms *		raparm_cache;
+
+/* 
+ * Called from nfsd_lookup and encode_dirent. Check if we have crossed 
+ * a mount point.
+ * Returns -EAGAIN leaving *dpp and *expp unchanged, 
+ *  or nfs_ok having possibly changed *dpp and *expp
+ */
+int
+nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 
+		        struct svc_export **expp)
+{
+	struct svc_export *exp = *expp, *exp2 = NULL;
+	struct dentry *dentry = *dpp;
+	struct vfsmount *mnt = mntget(exp->ex_mnt);
+	struct dentry *mounts = dget(dentry);
+	int err = nfs_ok;
+
+	while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts));
+
+	exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle);
+	if (IS_ERR(exp2)) {
+		err = PTR_ERR(exp2);
+		dput(mounts);
+		mntput(mnt);
+		goto out;
+	}
+	if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) {
+		/* successfully crossed mount point */
+		exp_put(exp);
+		*expp = exp2;
+		dput(dentry);
+		*dpp = mounts;
+	} else {
+		if (exp2) exp_put(exp2);
+		dput(mounts);
+	}
+	mntput(mnt);
+out:
+	return err;
+}
+
+/*
+ * Look up one component of a pathname.
+ * N.B. After this call _both_ fhp and resfh need an fh_put
+ *
+ * If the lookup would cross a mountpoint, and the mounted filesystem
+ * is exported to the client with NFSEXP_NOHIDE, then the lookup is
+ * accepted as it stands and the mounted directory is
+ * returned. Otherwise the covered directory is returned.
+ * NOTE: this mountpoint crossing is not supported properly by all
+ *   clients and is explicitly disallowed for NFSv3
+ *      NeilBrown <neilb@cse.unsw.edu.au>
+ */
+int
+nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name,
+					int len, struct svc_fh *resfh)
+{
+	struct svc_export	*exp;
+	struct dentry		*dparent;
+	struct dentry		*dentry;
+	int			err;
+
+	dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name);
+
+	/* Obtain dentry and export. */
+	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC);
+	if (err)
+		return err;
+
+	dparent = fhp->fh_dentry;
+	exp  = fhp->fh_export;
+	exp_get(exp);
+
+	err = nfserr_acces;
+
+	/* Lookup the name, but don't follow links */
+	if (isdotent(name, len)) {
+		if (len==1)
+			dentry = dget(dparent);
+		else if (dparent != exp->ex_dentry) {
+			dentry = dget_parent(dparent);
+		} else  if (!EX_NOHIDE(exp))
+			dentry = dget(dparent); /* .. == . just like at / */
+		else {
+			/* checking mountpoint crossing is very different when stepping up */
+			struct svc_export *exp2 = NULL;
+			struct dentry *dp;
+			struct vfsmount *mnt = mntget(exp->ex_mnt);
+			dentry = dget(dparent);
+			while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry))
+				;
+			dp = dget_parent(dentry);
+			dput(dentry);
+			dentry = dp;
+
+			exp2 = exp_parent(exp->ex_client, mnt, dentry,
+					  &rqstp->rq_chandle);
+			if (IS_ERR(exp2)) {
+				err = PTR_ERR(exp2);
+				dput(dentry);
+				mntput(mnt);
+				goto out_nfserr;
+			}
+			if (!exp2) {
+				dput(dentry);
+				dentry = dget(dparent);
+			} else {
+				exp_put(exp);
+				exp = exp2;
+			}
+			mntput(mnt);
+		}
+	} else {
+		fh_lock(fhp);
+		dentry = lookup_one_len(name, dparent, len);
+		err = PTR_ERR(dentry);
+		if (IS_ERR(dentry))
+			goto out_nfserr;
+		/*
+		 * check if we have crossed a mount point ...
+		 */
+		if (d_mountpoint(dentry)) {
+			if ((err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
+				dput(dentry);
+				goto out_nfserr;
+			}
+		}
+	}
+	/*
+	 * Note: we compose the file handle now, but as the
+	 * dentry may be negative, it may need to be updated.
+	 */
+	err = fh_compose(resfh, exp, dentry, fhp);
+	if (!err && !dentry->d_inode)
+		err = nfserr_noent;
+	dput(dentry);
+out:
+	exp_put(exp);
+	return err;
+
+out_nfserr:
+	err = nfserrno(err);
+	goto out;
+}
+
+/*
+ * Set various file attributes.
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
+	     int check_guard, time_t guardtime)
+{
+	struct dentry	*dentry;
+	struct inode	*inode;
+	int		accmode = MAY_SATTR;
+	int		ftype = 0;
+	int		imode;
+	int		err;
+	int		size_change = 0;
+
+	if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
+		accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
+	if (iap->ia_valid & ATTR_SIZE)
+		ftype = S_IFREG;
+
+	/* Get inode */
+	err = fh_verify(rqstp, fhp, ftype, accmode);
+	if (err || !iap->ia_valid)
+		goto out;
+
+	dentry = fhp->fh_dentry;
+	inode = dentry->d_inode;
+
+	/* NFSv2 does not differentiate between "set-[ac]time-to-now"
+	 * which only requires access, and "set-[ac]time-to-X" which
+	 * requires ownership.
+	 * So if it looks like it might be "set both to the same time which
+	 * is close to now", and if inode_change_ok fails, then we
+	 * convert to "set to now" instead of "set to explicit time"
+	 *
+	 * We only call inode_change_ok as the last test as technically
+	 * it is not an interface that we should be using.  It is only
+	 * valid if the filesystem does not define it's own i_op->setattr.
+	 */
+#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
+#define	MAX_TOUCH_TIME_ERROR (30*60)
+	if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
+	    && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec
+	    ) {
+	    /* Looks probable.  Now just make sure time is in the right ballpark.
+	     * Solaris, at least, doesn't seem to care what the time request is.
+	     * We require it be within 30 minutes of now.
+	     */
+	    time_t delta = iap->ia_atime.tv_sec - get_seconds();
+	    if (delta<0) delta = -delta;
+	    if (delta < MAX_TOUCH_TIME_ERROR &&
+		inode_change_ok(inode, iap) != 0) {
+		/* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
+		 * this will cause notify_change to set these times to "now"
+		 */
+		iap->ia_valid &= ~BOTH_TIME_SET;
+	    }
+	}
+	    
+	/* The size case is special. It changes the file as well as the attributes.  */
+	if (iap->ia_valid & ATTR_SIZE) {
+		if (iap->ia_size < inode->i_size) {
+			err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
+			if (err)
+				goto out;
+		}
+
+		/*
+		 * If we are changing the size of the file, then
+		 * we need to break all leases.
+		 */
+		err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
+		if (err == -EWOULDBLOCK)
+			err = -ETIMEDOUT;
+		if (err) /* ENOMEM or EWOULDBLOCK */
+			goto out_nfserr;
+
+		err = get_write_access(inode);
+		if (err)
+			goto out_nfserr;
+
+		size_change = 1;
+		err = locks_verify_truncate(inode, NULL, iap->ia_size);
+		if (err) {
+			put_write_access(inode);
+			goto out_nfserr;
+		}
+		DQUOT_INIT(inode);
+	}
+
+	imode = inode->i_mode;
+	if (iap->ia_valid & ATTR_MODE) {
+		iap->ia_mode &= S_IALLUGO;
+		imode = iap->ia_mode |= (imode & ~S_IALLUGO);
+	}
+
+	/* Revoke setuid/setgid bit on chown/chgrp */
+	if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
+		iap->ia_valid |= ATTR_KILL_SUID;
+	if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
+		iap->ia_valid |= ATTR_KILL_SGID;
+
+	/* Change the attributes. */
+
+	iap->ia_valid |= ATTR_CTIME;
+
+	err = nfserr_notsync;
+	if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
+		fh_lock(fhp);
+		err = notify_change(dentry, iap);
+		err = nfserrno(err);
+		fh_unlock(fhp);
+	}
+	if (size_change)
+		put_write_access(inode);
+	if (!err)
+		if (EX_ISSYNC(fhp->fh_export))
+			write_inode_now(inode, 1);
+out:
+	return err;
+
+out_nfserr:
+	err = nfserrno(err);
+	goto out;
+}
+
+#if defined(CONFIG_NFSD_V4)
+
+static int
+set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
+{
+	int len;
+	size_t buflen;
+	char *buf = NULL;
+	int error = 0;
+	struct inode *inode = dentry->d_inode;
+
+	buflen = posix_acl_xattr_size(pacl->a_count);
+	buf = kmalloc(buflen, GFP_KERNEL);
+	error = -ENOMEM;
+	if (buf == NULL)
+		goto out;
+
+	len = posix_acl_to_xattr(pacl, buf, buflen);
+	if (len < 0) {
+		error = len;
+		goto out;
+	}
+
+	error = -EOPNOTSUPP;
+	if (inode->i_op && inode->i_op->setxattr) {
+		down(&inode->i_sem);
+		security_inode_setxattr(dentry, key, buf, len, 0);
+		error = inode->i_op->setxattr(dentry, key, buf, len, 0);
+		if (!error)
+			security_inode_post_setxattr(dentry, key, buf, len, 0);
+		up(&inode->i_sem);
+	}
+out:
+	kfree(buf);
+	return error;
+}
+
+int
+nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
+    struct nfs4_acl *acl)
+{
+	int error;
+	struct dentry *dentry;
+	struct inode *inode;
+	struct posix_acl *pacl = NULL, *dpacl = NULL;
+	unsigned int flags = 0;
+
+	/* Get inode */
+	error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR);
+	if (error)
+		goto out;
+
+	dentry = fhp->fh_dentry;
+	inode = dentry->d_inode;
+	if (S_ISDIR(inode->i_mode))
+		flags = NFS4_ACL_DIR;
+
+	error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
+	if (error == -EINVAL) {
+		error = nfserr_attrnotsupp;
+		goto out;
+	} else if (error < 0)
+		goto out_nfserr;
+
+	if (pacl) {
+		error = set_nfsv4_acl_one(dentry, pacl, XATTR_NAME_ACL_ACCESS);
+		if (error < 0)
+			goto out_nfserr;
+	}
+
+	if (dpacl) {
+		error = set_nfsv4_acl_one(dentry, dpacl, XATTR_NAME_ACL_DEFAULT);
+		if (error < 0)
+			goto out_nfserr;
+	}
+
+	error = nfs_ok;
+
+out:
+	posix_acl_release(pacl);
+	posix_acl_release(dpacl);
+	return (error);
+out_nfserr:
+	error = nfserrno(error);
+	goto out;
+}
+
+static struct posix_acl *
+_get_posix_acl(struct dentry *dentry, char *key)
+{
+	struct inode *inode = dentry->d_inode;
+	char *buf = NULL;
+	int buflen, error = 0;
+	struct posix_acl *pacl = NULL;
+
+	error = -EOPNOTSUPP;
+	if (inode->i_op == NULL)
+		goto out_err;
+	if (inode->i_op->getxattr == NULL)
+		goto out_err;
+
+	error = security_inode_getxattr(dentry, key);
+	if (error)
+		goto out_err;
+
+	buflen = inode->i_op->getxattr(dentry, key, NULL, 0);
+	if (buflen <= 0) {
+		error = buflen < 0 ? buflen : -ENODATA;
+		goto out_err;
+	}
+
+	buf = kmalloc(buflen, GFP_KERNEL);
+	if (buf == NULL) {
+		error = -ENOMEM;
+		goto out_err;
+	}
+
+	error = inode->i_op->getxattr(dentry, key, buf, buflen);
+	if (error < 0)
+		goto out_err;
+
+	pacl = posix_acl_from_xattr(buf, buflen);
+ out:
+	kfree(buf);
+	return pacl;
+ out_err:
+	pacl = ERR_PTR(error);
+	goto out;
+}
+
+int
+nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	struct posix_acl *pacl = NULL, *dpacl = NULL;
+	unsigned int flags = 0;
+
+	pacl = _get_posix_acl(dentry, XATTR_NAME_ACL_ACCESS);
+	if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
+		pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
+	if (IS_ERR(pacl)) {
+		error = PTR_ERR(pacl);
+		pacl = NULL;
+		goto out;
+	}
+
+	if (S_ISDIR(inode->i_mode)) {
+		dpacl = _get_posix_acl(dentry, XATTR_NAME_ACL_DEFAULT);
+		if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
+			dpacl = NULL;
+		else if (IS_ERR(dpacl)) {
+			error = PTR_ERR(dpacl);
+			dpacl = NULL;
+			goto out;
+		}
+		flags = NFS4_ACL_DIR;
+	}
+
+	*acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags);
+	if (IS_ERR(*acl)) {
+		error = PTR_ERR(*acl);
+		*acl = NULL;
+	}
+ out:
+	posix_acl_release(pacl);
+	posix_acl_release(dpacl);
+	return error;
+}
+
+#endif /* defined(CONFIG_NFS_V4) */
+
+#ifdef CONFIG_NFSD_V3
+/*
+ * Check server access rights to a file system object
+ */
+struct accessmap {
+	u32		access;
+	int		how;
+};
+static struct accessmap	nfs3_regaccess[] = {
+    {	NFS3_ACCESS_READ,	MAY_READ			},
+    {	NFS3_ACCESS_EXECUTE,	MAY_EXEC			},
+    {	NFS3_ACCESS_MODIFY,	MAY_WRITE|MAY_TRUNC		},
+    {	NFS3_ACCESS_EXTEND,	MAY_WRITE			},
+
+    {	0,			0				}
+};
+
+static struct accessmap	nfs3_diraccess[] = {
+    {	NFS3_ACCESS_READ,	MAY_READ			},
+    {	NFS3_ACCESS_LOOKUP,	MAY_EXEC			},
+    {	NFS3_ACCESS_MODIFY,	MAY_EXEC|MAY_WRITE|MAY_TRUNC	},
+    {	NFS3_ACCESS_EXTEND,	MAY_EXEC|MAY_WRITE		},
+    {	NFS3_ACCESS_DELETE,	MAY_REMOVE			},
+
+    {	0,			0				}
+};
+
+static struct accessmap	nfs3_anyaccess[] = {
+	/* Some clients - Solaris 2.6 at least, make an access call
+	 * to the server to check for access for things like /dev/null
+	 * (which really, the server doesn't care about).  So
+	 * We provide simple access checking for them, looking
+	 * mainly at mode bits, and we make sure to ignore read-only
+	 * filesystem checks
+	 */
+    {	NFS3_ACCESS_READ,	MAY_READ			},
+    {	NFS3_ACCESS_EXECUTE,	MAY_EXEC			},
+    {	NFS3_ACCESS_MODIFY,	MAY_WRITE|MAY_LOCAL_ACCESS	},
+    {	NFS3_ACCESS_EXTEND,	MAY_WRITE|MAY_LOCAL_ACCESS	},
+
+    {	0,			0				}
+};
+
+int
+nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
+{
+	struct accessmap	*map;
+	struct svc_export	*export;
+	struct dentry		*dentry;
+	u32			query, result = 0, sresult = 0;
+	unsigned int		error;
+
+	error = fh_verify(rqstp, fhp, 0, MAY_NOP);
+	if (error)
+		goto out;
+
+	export = fhp->fh_export;
+	dentry = fhp->fh_dentry;
+
+	if (S_ISREG(dentry->d_inode->i_mode))
+		map = nfs3_regaccess;
+	else if (S_ISDIR(dentry->d_inode->i_mode))
+		map = nfs3_diraccess;
+	else
+		map = nfs3_anyaccess;
+
+
+	query = *access;
+	for  (; map->access; map++) {
+		if (map->access & query) {
+			unsigned int err2;
+
+			sresult |= map->access;
+
+			err2 = nfsd_permission(export, dentry, map->how);
+			switch (err2) {
+			case nfs_ok:
+				result |= map->access;
+				break;
+				
+			/* the following error codes just mean the access was not allowed,
+			 * rather than an error occurred */
+			case nfserr_rofs:
+			case nfserr_acces:
+			case nfserr_perm:
+				/* simply don't "or" in the access bit. */
+				break;
+			default:
+				error = err2;
+				goto out;
+			}
+		}
+	}
+	*access = result;
+	if (supported)
+		*supported = sresult;
+
+ out:
+	return error;
+}
+#endif /* CONFIG_NFSD_V3 */
+
+
+
+/*
+ * Open an existing file or directory.
+ * The access argument indicates the type of open (read/write/lock)
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
+			int access, struct file **filp)
+{
+	struct dentry	*dentry;
+	struct inode	*inode;
+	int		flags = O_RDONLY|O_LARGEFILE, err;
+
+	/*
+	 * If we get here, then the client has already done an "open",
+	 * and (hopefully) checked permission - so allow OWNER_OVERRIDE
+	 * in case a chmod has now revoked permission.
+	 */
+	err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE);
+	if (err)
+		goto out;
+
+	dentry = fhp->fh_dentry;
+	inode = dentry->d_inode;
+
+	/* Disallow write access to files with the append-only bit set
+	 * or any access when mandatory locking enabled
+	 */
+	err = nfserr_perm;
+	if (IS_APPEND(inode) && (access & MAY_WRITE))
+		goto out;
+	if (IS_ISMNDLK(inode))
+		goto out;
+
+	if (!inode->i_fop)
+		goto out;
+
+	/*
+	 * Check to see if there are any leases on this file.
+	 * This may block while leases are broken.
+	 */
+	err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0));
+	if (err == -EWOULDBLOCK)
+		err = -ETIMEDOUT;
+	if (err) /* NOMEM or WOULDBLOCK */
+		goto out_nfserr;
+
+	if (access & MAY_WRITE) {
+		flags = O_WRONLY|O_LARGEFILE;
+
+		DQUOT_INIT(inode);
+	}
+	*filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags);
+	if (IS_ERR(*filp))
+		err = PTR_ERR(*filp);
+out_nfserr:
+	if (err)
+		err = nfserrno(err);
+out:
+	return err;
+}
+
+/*
+ * Close a file.
+ */
+void
+nfsd_close(struct file *filp)
+{
+	fput(filp);
+}
+
+/*
+ * Sync a file
+ * As this calls fsync (not fdatasync) there is no need for a write_inode
+ * after it.
+ */
+static inline void nfsd_dosync(struct file *filp, struct dentry *dp,
+			       struct file_operations *fop)
+{
+	struct inode *inode = dp->d_inode;
+	int (*fsync) (struct file *, struct dentry *, int);
+
+	filemap_fdatawrite(inode->i_mapping);
+	if (fop && (fsync = fop->fsync))
+		fsync(filp, dp, 0);
+	filemap_fdatawait(inode->i_mapping);
+}
+	
+
+static void
+nfsd_sync(struct file *filp)
+{
+	struct inode *inode = filp->f_dentry->d_inode;
+	dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name);
+	down(&inode->i_sem);
+	nfsd_dosync(filp, filp->f_dentry, filp->f_op);
+	up(&inode->i_sem);
+}
+
+static void
+nfsd_sync_dir(struct dentry *dp)
+{
+	nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
+}
+
+/*
+ * Obtain the readahead parameters for the file
+ * specified by (dev, ino).
+ */
+static DEFINE_SPINLOCK(ra_lock);
+
+static inline struct raparms *
+nfsd_get_raparms(dev_t dev, ino_t ino)
+{
+	struct raparms	*ra, **rap, **frap = NULL;
+	int depth = 0;
+
+	spin_lock(&ra_lock);
+	for (rap = &raparm_cache; (ra = *rap); rap = &ra->p_next) {
+		if (ra->p_ino == ino && ra->p_dev == dev)
+			goto found;
+		depth++;
+		if (ra->p_count == 0)
+			frap = rap;
+	}
+	depth = nfsdstats.ra_size*11/10;
+	if (!frap) {	
+		spin_unlock(&ra_lock);
+		return NULL;
+	}
+	rap = frap;
+	ra = *frap;
+	ra->p_dev = dev;
+	ra->p_ino = ino;
+	ra->p_set = 0;
+found:
+	if (rap != &raparm_cache) {
+		*rap = ra->p_next;
+		ra->p_next   = raparm_cache;
+		raparm_cache = ra;
+	}
+	ra->p_count++;
+	nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++;
+	spin_unlock(&ra_lock);
+	return ra;
+}
+
+/*
+ * Grab and keep cached pages assosiated with a file in the svc_rqst
+ * so that they can be passed to the netowork sendmsg/sendpage routines
+ * directrly. They will be released after the sending has completed.
+ */
+static int
+nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size)
+{
+	unsigned long count = desc->count;
+	struct svc_rqst *rqstp = desc->arg.data;
+
+	if (size > count)
+		size = count;
+
+	if (rqstp->rq_res.page_len == 0) {
+		get_page(page);
+		rqstp->rq_respages[rqstp->rq_resused++] = page;
+		rqstp->rq_res.page_base = offset;
+		rqstp->rq_res.page_len = size;
+	} else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) {
+		get_page(page);
+		rqstp->rq_respages[rqstp->rq_resused++] = page;
+		rqstp->rq_res.page_len += size;
+	} else {
+		rqstp->rq_res.page_len += size;
+	}
+
+	desc->count = count - size;
+	desc->written += size;
+	return size;
+}
+
+static inline int
+nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
+              loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
+{
+	struct inode *inode;
+	struct raparms	*ra;
+	mm_segment_t	oldfs;
+	int		err;
+
+	err = nfserr_perm;
+	inode = file->f_dentry->d_inode;
+#ifdef MSNFS
+	if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+		(!lock_may_read(inode, offset, *count)))
+		goto out;
+#endif
+
+	/* Get readahead parameters */
+	ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
+
+	if (ra && ra->p_set)
+		file->f_ra = ra->p_ra;
+
+	if (file->f_op->sendfile) {
+		svc_pushback_unused_pages(rqstp);
+		err = file->f_op->sendfile(file, &offset, *count,
+						 nfsd_read_actor, rqstp);
+	} else {
+		oldfs = get_fs();
+		set_fs(KERNEL_DS);
+		err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
+		set_fs(oldfs);
+	}
+
+	/* Write back readahead params */
+	if (ra) {
+		spin_lock(&ra_lock);
+		ra->p_ra = file->f_ra;
+		ra->p_set = 1;
+		ra->p_count--;
+		spin_unlock(&ra_lock);
+	}
+
+	if (err >= 0) {
+		nfsdstats.io_read += err;
+		*count = err;
+		err = 0;
+		dnotify_parent(file->f_dentry, DN_ACCESS);
+	} else 
+		err = nfserrno(err);
+out:
+	return err;
+}
+
+static inline int
+nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
+				loff_t offset, struct kvec *vec, int vlen,
+	   			unsigned long cnt, int *stablep)
+{
+	struct svc_export	*exp;
+	struct dentry		*dentry;
+	struct inode		*inode;
+	mm_segment_t		oldfs;
+	int			err = 0;
+	int			stable = *stablep;
+
+	err = nfserr_perm;
+
+#ifdef MSNFS
+	if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+		(!lock_may_write(file->f_dentry->d_inode, offset, cnt)))
+		goto out;
+#endif
+
+	dentry = file->f_dentry;
+	inode = dentry->d_inode;
+	exp   = fhp->fh_export;
+
+	/*
+	 * Request sync writes if
+	 *  -	the sync export option has been set, or
+	 *  -	the client requested O_SYNC behavior (NFSv3 feature).
+	 *  -   The file system doesn't support fsync().
+	 * When gathered writes have been configured for this volume,
+	 * flushing the data to disk is handled separately below.
+	 */
+
+	if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */
+	       stable = 2;
+	       *stablep = 2; /* FILE_SYNC */
+	}
+
+	if (!EX_ISSYNC(exp))
+		stable = 0;
+	if (stable && !EX_WGATHER(exp))
+		file->f_flags |= O_SYNC;
+
+	/* Write the data. */
+	oldfs = get_fs(); set_fs(KERNEL_DS);
+	err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset);
+	set_fs(oldfs);
+	if (err >= 0) {
+		nfsdstats.io_write += cnt;
+		dnotify_parent(file->f_dentry, DN_MODIFY);
+	}
+
+	/* clear setuid/setgid flag after write */
+	if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) {
+		struct iattr	ia;
+		ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
+
+		down(&inode->i_sem);
+		notify_change(dentry, &ia);
+		up(&inode->i_sem);
+	}
+
+	if (err >= 0 && stable) {
+		static ino_t	last_ino;
+		static dev_t	last_dev;
+
+		/*
+		 * Gathered writes: If another process is currently
+		 * writing to the file, there's a high chance
+		 * this is another nfsd (triggered by a bulk write
+		 * from a client's biod). Rather than syncing the
+		 * file with each write request, we sleep for 10 msec.
+		 *
+		 * I don't know if this roughly approximates
+		 * C. Juszak's idea of gathered writes, but it's a
+		 * nice and simple solution (IMHO), and it seems to
+		 * work:-)
+		 */
+		if (EX_WGATHER(exp)) {
+			if (atomic_read(&inode->i_writecount) > 1
+			    || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) {
+				dprintk("nfsd: write defer %d\n", current->pid);
+				msleep(10);
+				dprintk("nfsd: write resume %d\n", current->pid);
+			}
+
+			if (inode->i_state & I_DIRTY) {
+				dprintk("nfsd: write sync %d\n", current->pid);
+				nfsd_sync(file);
+			}
+#if 0
+			wake_up(&inode->i_wait);
+#endif
+		}
+		last_ino = inode->i_ino;
+		last_dev = inode->i_sb->s_dev;
+	}
+
+	dprintk("nfsd: write complete err=%d\n", err);
+	if (err >= 0)
+		err = 0;
+	else 
+		err = nfserrno(err);
+out:
+	return err;
+}
+
+/*
+ * Read data from a file. count must contain the requested read count
+ * on entry. On return, *count contains the number of bytes actually read.
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
+		loff_t offset, struct kvec *vec, int vlen,
+		unsigned long *count)
+{
+	int		err;
+
+	if (file) {
+		err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
+				MAY_READ|MAY_OWNER_OVERRIDE);
+		if (err)
+			goto out;
+		err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
+	} else {
+		err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file);
+		if (err)
+			goto out;
+		err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
+		nfsd_close(file);
+	}
+out:
+	return err;
+}
+
+/*
+ * Write data to a file.
+ * The stable flag requests synchronous writes.
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
+		loff_t offset, struct kvec *vec, int vlen, unsigned long cnt,
+		int *stablep)
+{
+	int			err = 0;
+
+	if (file) {
+		err = nfsd_permission(fhp->fh_export, fhp->fh_dentry,
+				MAY_WRITE|MAY_OWNER_OVERRIDE);
+		if (err)
+			goto out;
+		err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
+				stablep);
+	} else {
+		err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file);
+		if (err)
+			goto out;
+
+		if (cnt)
+			err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
+					     cnt, stablep);
+		nfsd_close(file);
+	}
+out:
+	return err;
+}
+
+#ifdef CONFIG_NFSD_V3
+/*
+ * Commit all pending writes to stable storage.
+ * Strictly speaking, we could sync just the indicated file region here,
+ * but there's currently no way we can ask the VFS to do so.
+ *
+ * Unfortunately we cannot lock the file to make sure we return full WCC
+ * data to the client, as locking happens lower down in the filesystem.
+ */
+int
+nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
+               loff_t offset, unsigned long count)
+{
+	struct file	*file;
+	int		err;
+
+	if ((u64)count > ~(u64)offset)
+		return nfserr_inval;
+
+	if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0)
+		return err;
+	if (EX_ISSYNC(fhp->fh_export)) {
+		if (file->f_op && file->f_op->fsync) {
+			nfsd_sync(file);
+		} else {
+			err = nfserr_notsupp;
+		}
+	}
+
+	nfsd_close(file);
+	return err;
+}
+#endif /* CONFIG_NFSD_V3 */
+
+/*
+ * Create a file (regular, directory, device, fifo); UNIX sockets 
+ * not yet implemented.
+ * If the response fh has been verified, the parent directory should
+ * already be locked. Note that the parent directory is left locked.
+ *
+ * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
+ */
+int
+nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
+		char *fname, int flen, struct iattr *iap,
+		int type, dev_t rdev, struct svc_fh *resfhp)
+{
+	struct dentry	*dentry, *dchild = NULL;
+	struct inode	*dirp;
+	int		err;
+
+	err = nfserr_perm;
+	if (!flen)
+		goto out;
+	err = nfserr_exist;
+	if (isdotent(fname, flen))
+		goto out;
+
+	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
+	if (err)
+		goto out;
+
+	dentry = fhp->fh_dentry;
+	dirp = dentry->d_inode;
+
+	err = nfserr_notdir;
+	if(!dirp->i_op || !dirp->i_op->lookup)
+		goto out;
+	/*
+	 * Check whether the response file handle has been verified yet.
+	 * If it has, the parent directory should already be locked.
+	 */
+	if (!resfhp->fh_dentry) {
+		/* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */
+		fh_lock(fhp);
+		dchild = lookup_one_len(fname, dentry, flen);
+		err = PTR_ERR(dchild);
+		if (IS_ERR(dchild))
+			goto out_nfserr;
+		err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
+		if (err)
+			goto out;
+	} else {
+		/* called from nfsd_proc_create */
+		dchild = dget(resfhp->fh_dentry);
+		if (!fhp->fh_locked) {
+			/* not actually possible */
+			printk(KERN_ERR
+				"nfsd_create: parent %s/%s not locked!\n",
+				dentry->d_parent->d_name.name,
+				dentry->d_name.name);
+			err = -EIO;
+			goto out;
+		}
+	}
+	/*
+	 * Make sure the child dentry is still negative ...
+	 */
+	err = nfserr_exist;
+	if (dchild->d_inode) {
+		dprintk("nfsd_create: dentry %s/%s not negative!\n",
+			dentry->d_name.name, dchild->d_name.name);
+		goto out; 
+	}
+
+	if (!(iap->ia_valid & ATTR_MODE))
+		iap->ia_mode = 0;
+	iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
+
+	/*
+	 * Get the dir op function pointer.
+	 */
+	err = nfserr_perm;
+	switch (type) {
+	case S_IFREG:
+		err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
+		break;
+	case S_IFDIR:
+		err = vfs_mkdir(dirp, dchild, iap->ia_mode);
+		break;
+	case S_IFCHR:
+	case S_IFBLK:
+	case S_IFIFO:
+	case S_IFSOCK:
+		err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
+		break;
+	default:
+	        printk("nfsd: bad file type %o in nfsd_create\n", type);
+		err = -EINVAL;
+	}
+	if (err < 0)
+		goto out_nfserr;
+
+	if (EX_ISSYNC(fhp->fh_export)) {
+		nfsd_sync_dir(dentry);
+		write_inode_now(dchild->d_inode, 1);
+	}
+
+
+	/* Set file attributes. Mode has already been set and
+	 * setting uid/gid works only for root. Irix appears to
+	 * send along the gid when it tries to implement setgid
+	 * directories via NFS.
+	 */
+	err = 0;
+	if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0)
+		err = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
+	/*
+	 * Update the file handle to get the new inode info.
+	 */
+	if (!err)
+		err = fh_update(resfhp);
+out:
+	if (dchild && !IS_ERR(dchild))
+		dput(dchild);
+	return err;
+
+out_nfserr:
+	err = nfserrno(err);
+	goto out;
+}
+
+#ifdef CONFIG_NFSD_V3
+/*
+ * NFSv3 version of nfsd_create
+ */
+int
+nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
+		char *fname, int flen, struct iattr *iap,
+		struct svc_fh *resfhp, int createmode, u32 *verifier,
+	        int *truncp)
+{
+	struct dentry	*dentry, *dchild = NULL;
+	struct inode	*dirp;
+	int		err;
+	__u32		v_mtime=0, v_atime=0;
+	int		v_mode=0;
+
+	err = nfserr_perm;
+	if (!flen)
+		goto out;
+	err = nfserr_exist;
+	if (isdotent(fname, flen))
+		goto out;
+	if (!(iap->ia_valid & ATTR_MODE))
+		iap->ia_mode = 0;
+	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
+	if (err)
+		goto out;
+
+	dentry = fhp->fh_dentry;
+	dirp = dentry->d_inode;
+
+	/* Get all the sanity checks out of the way before
+	 * we lock the parent. */
+	err = nfserr_notdir;
+	if(!dirp->i_op || !dirp->i_op->lookup)
+		goto out;
+	fh_lock(fhp);
+
+	/*
+	 * Compose the response file handle.
+	 */
+	dchild = lookup_one_len(fname, dentry, flen);
+	err = PTR_ERR(dchild);
+	if (IS_ERR(dchild))
+		goto out_nfserr;
+
+	err = fh_compose(resfhp, fhp->fh_export, dchild, fhp);
+	if (err)
+		goto out;
+
+	if (createmode == NFS3_CREATE_EXCLUSIVE) {
+		/* while the verifier would fit in mtime+atime,
+		 * solaris7 gets confused (bugid 4218508) if these have
+		 * the high bit set, so we use the mode as well
+		 */
+		v_mtime = verifier[0]&0x7fffffff;
+		v_atime = verifier[1]&0x7fffffff;
+		v_mode  = S_IFREG
+			| ((verifier[0]&0x80000000) >> (32-7)) /* u+x */
+			| ((verifier[1]&0x80000000) >> (32-9)) /* u+r */
+			;
+	}
+	
+	if (dchild->d_inode) {
+		err = 0;
+
+		switch (createmode) {
+		case NFS3_CREATE_UNCHECKED:
+			if (! S_ISREG(dchild->d_inode->i_mode))
+				err = nfserr_exist;
+			else if (truncp) {
+				/* in nfsv4, we need to treat this case a little
+				 * differently.  we don't want to truncate the
+				 * file now; this would be wrong if the OPEN
+				 * fails for some other reason.  furthermore,
+				 * if the size is nonzero, we should ignore it
+				 * according to spec!
+				 */
+				*truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size;
+			}
+			else {
+				iap->ia_valid &= ATTR_SIZE;
+				goto set_attr;
+			}
+			break;
+		case NFS3_CREATE_EXCLUSIVE:
+			if (   dchild->d_inode->i_mtime.tv_sec == v_mtime
+			    && dchild->d_inode->i_atime.tv_sec == v_atime
+			    && dchild->d_inode->i_mode  == v_mode
+			    && dchild->d_inode->i_size  == 0 )
+				break;
+			 /* fallthru */
+		case NFS3_CREATE_GUARDED:
+			err = nfserr_exist;
+		}
+		goto out;
+	}
+
+	err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
+	if (err < 0)
+		goto out_nfserr;
+
+	if (EX_ISSYNC(fhp->fh_export)) {
+		nfsd_sync_dir(dentry);
+		/* setattr will sync the child (or not) */
+	}
+
+	/*
+	 * Update the filehandle to get the new inode info.
+	 */
+	err = fh_update(resfhp);
+	if (err)
+		goto out;
+
+	if (createmode == NFS3_CREATE_EXCLUSIVE) {
+		/* Cram the verifier into atime/mtime/mode */
+		iap->ia_valid = ATTR_MTIME|ATTR_ATIME
+			| ATTR_MTIME_SET|ATTR_ATIME_SET
+			| ATTR_MODE;
+		/* XXX someone who knows this better please fix it for nsec */ 
+		iap->ia_mtime.tv_sec = v_mtime;
+		iap->ia_atime.tv_sec = v_atime;
+		iap->ia_mtime.tv_nsec = 0;
+		iap->ia_atime.tv_nsec = 0;
+		iap->ia_mode  = v_mode;
+	}
+
+	/* Set file attributes.
+	 * Mode has already been set but we might need to reset it
+	 * for CREATE_EXCLUSIVE
+	 * Irix appears to send along the gid when it tries to
+	 * implement setgid directories via NFS. Clear out all that cruft.
+	 */
+ set_attr:
+	if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0)
+ 		err = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
+
+ out:
+	fh_unlock(fhp);
+	if (dchild && !IS_ERR(dchild))
+		dput(dchild);
+ 	return err;
+ 
+ out_nfserr:
+	err = nfserrno(err);
+	goto out;
+}
+#endif /* CONFIG_NFSD_V3 */
+
+/*
+ * Read a symlink. On entry, *lenp must contain the maximum path length that
+ * fits into the buffer. On return, it contains the true length.
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
+{
+	struct dentry	*dentry;
+	struct inode	*inode;
+	mm_segment_t	oldfs;
+	int		err;
+
+	err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP);
+	if (err)
+		goto out;
+
+	dentry = fhp->fh_dentry;
+	inode = dentry->d_inode;
+
+	err = nfserr_inval;
+	if (!inode->i_op || !inode->i_op->readlink)
+		goto out;
+
+	touch_atime(fhp->fh_export->ex_mnt, dentry);
+	/* N.B. Why does this call need a get_fs()??
+	 * Remove the set_fs and watch the fireworks:-) --okir
+	 */
+
+	oldfs = get_fs(); set_fs(KERNEL_DS);
+	err = inode->i_op->readlink(dentry, buf, *lenp);
+	set_fs(oldfs);
+
+	if (err < 0)
+		goto out_nfserr;
+	*lenp = err;
+	err = 0;
+out:
+	return err;
+
+out_nfserr:
+	err = nfserrno(err);
+	goto out;
+}
+
+/*
+ * Create a symlink and look up its inode
+ * N.B. After this call _both_ fhp and resfhp need an fh_put
+ */
+int
+nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
+				char *fname, int flen,
+				char *path,  int plen,
+				struct svc_fh *resfhp,
+				struct iattr *iap)
+{
+	struct dentry	*dentry, *dnew;
+	int		err, cerr;
+	umode_t		mode;
+
+	err = nfserr_noent;
+	if (!flen || !plen)
+		goto out;
+	err = nfserr_exist;
+	if (isdotent(fname, flen))
+		goto out;
+
+	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
+	if (err)
+		goto out;
+	fh_lock(fhp);
+	dentry = fhp->fh_dentry;
+	dnew = lookup_one_len(fname, dentry, flen);
+	err = PTR_ERR(dnew);
+	if (IS_ERR(dnew))
+		goto out_nfserr;
+
+	mode = S_IALLUGO;
+	/* Only the MODE ATTRibute is even vaguely meaningful */
+	if (iap && (iap->ia_valid & ATTR_MODE))
+		mode = iap->ia_mode & S_IALLUGO;
+
+	if (unlikely(path[plen] != 0)) {
+		char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
+		if (path_alloced == NULL)
+			err = -ENOMEM;
+		else {
+			strncpy(path_alloced, path, plen);
+			path_alloced[plen] = 0;
+			err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
+			kfree(path_alloced);
+		}
+	} else
+		err = vfs_symlink(dentry->d_inode, dnew, path, mode);
+
+	if (!err) {
+		if (EX_ISSYNC(fhp->fh_export))
+			nfsd_sync_dir(dentry);
+	} else
+		err = nfserrno(err);
+	fh_unlock(fhp);
+
+	cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
+	dput(dnew);
+	if (err==0) err = cerr;
+out:
+	return err;
+
+out_nfserr:
+	err = nfserrno(err);
+	goto out;
+}
+
+/*
+ * Create a hardlink
+ * N.B. After this call _both_ ffhp and tfhp need an fh_put
+ */
+int
+nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
+				char *name, int len, struct svc_fh *tfhp)
+{
+	struct dentry	*ddir, *dnew, *dold;
+	struct inode	*dirp, *dest;
+	int		err;
+
+	err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
+	if (err)
+		goto out;
+	err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP);
+	if (err)
+		goto out;
+
+	err = nfserr_perm;
+	if (!len)
+		goto out;
+	err = nfserr_exist;
+	if (isdotent(name, len))
+		goto out;
+
+	fh_lock(ffhp);
+	ddir = ffhp->fh_dentry;
+	dirp = ddir->d_inode;
+
+	dnew = lookup_one_len(name, ddir, len);
+	err = PTR_ERR(dnew);
+	if (IS_ERR(dnew))
+		goto out_nfserr;
+
+	dold = tfhp->fh_dentry;
+	dest = dold->d_inode;
+
+	err = vfs_link(dold, dirp, dnew);
+	if (!err) {
+		if (EX_ISSYNC(ffhp->fh_export)) {
+			nfsd_sync_dir(ddir);
+			write_inode_now(dest, 1);
+		}
+	} else {
+		if (err == -EXDEV && rqstp->rq_vers == 2)
+			err = nfserr_acces;
+		else
+			err = nfserrno(err);
+	}
+
+	fh_unlock(ffhp);
+	dput(dnew);
+out:
+	return err;
+
+out_nfserr:
+	err = nfserrno(err);
+	goto out;
+}
+
+/*
+ * Rename a file
+ * N.B. After this call _both_ ffhp and tfhp need an fh_put
+ */
+int
+nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
+			    struct svc_fh *tfhp, char *tname, int tlen)
+{
+	struct dentry	*fdentry, *tdentry, *odentry, *ndentry, *trap;
+	struct inode	*fdir, *tdir;
+	int		err;
+
+	err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
+	if (err)
+		goto out;
+	err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
+	if (err)
+		goto out;
+
+	fdentry = ffhp->fh_dentry;
+	fdir = fdentry->d_inode;
+
+	tdentry = tfhp->fh_dentry;
+	tdir = tdentry->d_inode;
+
+	err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
+	if (fdir->i_sb != tdir->i_sb)
+		goto out;
+
+	err = nfserr_perm;
+	if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen))
+		goto out;
+
+	/* cannot use fh_lock as we need deadlock protective ordering
+	 * so do it by hand */
+	trap = lock_rename(tdentry, fdentry);
+	ffhp->fh_locked = tfhp->fh_locked = 1;
+	fill_pre_wcc(ffhp);
+	fill_pre_wcc(tfhp);
+
+	odentry = lookup_one_len(fname, fdentry, flen);
+	err = PTR_ERR(odentry);
+	if (IS_ERR(odentry))
+		goto out_nfserr;
+
+	err = -ENOENT;
+	if (!odentry->d_inode)
+		goto out_dput_old;
+	err = -EINVAL;
+	if (odentry == trap)
+		goto out_dput_old;
+
+	ndentry = lookup_one_len(tname, tdentry, tlen);
+	err = PTR_ERR(ndentry);
+	if (IS_ERR(ndentry))
+		goto out_dput_old;
+	err = -ENOTEMPTY;
+	if (ndentry == trap)
+		goto out_dput_new;
+
+#ifdef MSNFS
+	if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+		((atomic_read(&odentry->d_count) > 1)
+		 || (atomic_read(&ndentry->d_count) > 1))) {
+			err = nfserr_perm;
+	} else
+#endif
+	err = vfs_rename(fdir, odentry, tdir, ndentry);
+	if (!err && EX_ISSYNC(tfhp->fh_export)) {
+		nfsd_sync_dir(tdentry);
+		nfsd_sync_dir(fdentry);
+	}
+
+ out_dput_new:
+	dput(ndentry);
+ out_dput_old:
+	dput(odentry);
+ out_nfserr:
+	if (err)
+		err = nfserrno(err);
+
+	/* we cannot reply on fh_unlock on the two filehandles,
+	 * as that would do the wrong thing if the two directories
+	 * were the same, so again we do it by hand
+	 */
+	fill_post_wcc(ffhp);
+	fill_post_wcc(tfhp);
+	unlock_rename(tdentry, fdentry);
+	ffhp->fh_locked = tfhp->fh_locked = 0;
+
+out:
+	return err;
+}
+
+/*
+ * Unlink a file or directory
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
+				char *fname, int flen)
+{
+	struct dentry	*dentry, *rdentry;
+	struct inode	*dirp;
+	int		err;
+
+	err = nfserr_acces;
+	if (!flen || isdotent(fname, flen))
+		goto out;
+	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
+	if (err)
+		goto out;
+
+	fh_lock(fhp);
+	dentry = fhp->fh_dentry;
+	dirp = dentry->d_inode;
+
+	rdentry = lookup_one_len(fname, dentry, flen);
+	err = PTR_ERR(rdentry);
+	if (IS_ERR(rdentry))
+		goto out_nfserr;
+
+	if (!rdentry->d_inode) {
+		dput(rdentry);
+		err = nfserr_noent;
+		goto out;
+	}
+
+	if (!type)
+		type = rdentry->d_inode->i_mode & S_IFMT;
+
+	if (type != S_IFDIR) { /* It's UNLINK */
+#ifdef MSNFS
+		if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) &&
+			(atomic_read(&rdentry->d_count) > 1)) {
+			err = nfserr_perm;
+		} else
+#endif
+		err = vfs_unlink(dirp, rdentry);
+	} else { /* It's RMDIR */
+		err = vfs_rmdir(dirp, rdentry);
+	}
+
+	dput(rdentry);
+
+	if (err)
+		goto out_nfserr;
+	if (EX_ISSYNC(fhp->fh_export)) 
+		nfsd_sync_dir(dentry);
+
+out:
+	return err;
+
+out_nfserr:
+	err = nfserrno(err);
+	goto out;
+}
+
+/*
+ * Read entries from a directory.
+ * The  NFSv3/4 verifier we ignore for now.
+ */
+int
+nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 
+	     struct readdir_cd *cdp, encode_dent_fn func)
+{
+	int		err;
+	struct file	*file;
+	loff_t		offset = *offsetp;
+
+	err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file);
+	if (err)
+		goto out;
+
+	offset = vfs_llseek(file, offset, 0);
+	if (offset < 0) {
+		err = nfserrno((int)offset);
+		goto out_close;
+	}
+
+	/*
+	 * Read the directory entries. This silly loop is necessary because
+	 * readdir() is not guaranteed to fill up the entire buffer, but
+	 * may choose to do less.
+	 */
+
+	do {
+		cdp->err = nfserr_eof; /* will be cleared on successful read */
+		err = vfs_readdir(file, (filldir_t) func, cdp);
+	} while (err >=0 && cdp->err == nfs_ok);
+	if (err)
+		err = nfserrno(err);
+	else
+		err = cdp->err;
+	*offsetp = vfs_llseek(file, 0, 1);
+
+	if (err == nfserr_eof || err == nfserr_toosmall)
+		err = nfs_ok; /* can still be found in ->err */
+out_close:
+	nfsd_close(file);
+out:
+	return err;
+}
+
+/*
+ * Get file system stats
+ * N.B. After this call fhp needs an fh_put
+ */
+int
+nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat)
+{
+	int err = fh_verify(rqstp, fhp, 0, MAY_NOP);
+	if (!err && vfs_statfs(fhp->fh_dentry->d_inode->i_sb,stat))
+		err = nfserr_io;
+	return err;
+}
+
+/*
+ * Check for a user's access permissions to this inode.
+ */
+int
+nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc)
+{
+	struct inode	*inode = dentry->d_inode;
+	int		err;
+
+	if (acc == MAY_NOP)
+		return 0;
+#if 0
+	dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n",
+		acc,
+		(acc & MAY_READ)?	" read"  : "",
+		(acc & MAY_WRITE)?	" write" : "",
+		(acc & MAY_EXEC)?	" exec"  : "",
+		(acc & MAY_SATTR)?	" sattr" : "",
+		(acc & MAY_TRUNC)?	" trunc" : "",
+		(acc & MAY_LOCK)?	" lock"  : "",
+		(acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "",
+		inode->i_mode,
+		IS_IMMUTABLE(inode)?	" immut" : "",
+		IS_APPEND(inode)?	" append" : "",
+		IS_RDONLY(inode)?	" ro" : "");
+	dprintk("      owner %d/%d user %d/%d\n",
+		inode->i_uid, inode->i_gid, current->fsuid, current->fsgid);
+#endif
+
+	/* Normally we reject any write/sattr etc access on a read-only file
+	 * system.  But if it is IRIX doing check on write-access for a 
+	 * device special file, we ignore rofs.
+	 */
+	if (!(acc & MAY_LOCAL_ACCESS))
+		if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) {
+			if (EX_RDONLY(exp) || IS_RDONLY(inode))
+				return nfserr_rofs;
+			if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode))
+				return nfserr_perm;
+		}
+	if ((acc & MAY_TRUNC) && IS_APPEND(inode))
+		return nfserr_perm;
+
+	if (acc & MAY_LOCK) {
+		/* If we cannot rely on authentication in NLM requests,
+		 * just allow locks, otherwise require read permission, or
+		 * ownership
+		 */
+		if (exp->ex_flags & NFSEXP_NOAUTHNLM)
+			return 0;
+		else
+			acc = MAY_READ | MAY_OWNER_OVERRIDE;
+	}
+	/*
+	 * The file owner always gets access permission for accesses that
+	 * would normally be checked at open time. This is to make
+	 * file access work even when the client has done a fchmod(fd, 0).
+	 *
+	 * However, `cp foo bar' should fail nevertheless when bar is
+	 * readonly. A sensible way to do this might be to reject all
+	 * attempts to truncate a read-only file, because a creat() call
+	 * always implies file truncation.
+	 * ... but this isn't really fair.  A process may reasonably call
+	 * ftruncate on an open file descriptor on a file with perm 000.
+	 * We must trust the client to do permission checking - using "ACCESS"
+	 * with NFSv3.
+	 */
+	if ((acc & MAY_OWNER_OVERRIDE) &&
+	    inode->i_uid == current->fsuid)
+		return 0;
+
+	err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL);
+
+	/* Allow read access to binaries even when mode 111 */
+	if (err == -EACCES && S_ISREG(inode->i_mode) &&
+	    acc == (MAY_READ | MAY_OWNER_OVERRIDE))
+		err = permission(inode, MAY_EXEC, NULL);
+
+	return err? nfserrno(err) : 0;
+}
+
+void
+nfsd_racache_shutdown(void)
+{
+	if (!raparm_cache)
+		return;
+	dprintk("nfsd: freeing readahead buffers.\n");
+	kfree(raparml);
+	raparm_cache = raparml = NULL;
+}
+/*
+ * Initialize readahead param cache
+ */
+int
+nfsd_racache_init(int cache_size)
+{
+	int	i;
+
+	if (raparm_cache)
+		return 0;
+	raparml = kmalloc(sizeof(struct raparms) * cache_size, GFP_KERNEL);
+
+	if (raparml != NULL) {
+		dprintk("nfsd: allocating %d readahead buffers.\n",
+			cache_size);
+		memset(raparml, 0, sizeof(struct raparms) * cache_size);
+		for (i = 0; i < cache_size - 1; i++) {
+			raparml[i].p_next = raparml + i + 1;
+		}
+		raparm_cache = raparml;
+	} else {
+		printk(KERN_WARNING
+		       "nfsd: Could not allocate memory read-ahead cache.\n");
+		return -ENOMEM;
+	}
+	nfsdstats.ra_size = cache_size;
+	return 0;
+}