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!

fs/coda/Makefile

@@ -0,0 +1,12 @@
+#
+# Makefile for the Linux Coda filesystem routines.
+#
+
+obj-$(CONFIG_CODA_FS) += coda.o
+
+coda-objs := psdev.o cache.o cnode.o inode.o dir.o file.o upcall.o \
+	     coda_linux.o symlink.o pioctl.o sysctl.o 
+
+# If you want debugging output, please uncomment the following line.
+
+# EXTRA_CFLAGS += -DDEBUG -DDEBUG_SMB_MALLOC=1

fs/coda/cache.c

@@ -0,0 +1,120 @@
+/*
+ * Cache operations for Coda.
+ * For Linux 2.1: (C) 1997 Carnegie Mellon University
+ * For Linux 2.3: (C) 2000 Carnegie Mellon University
+ *
+ * Carnegie Mellon encourages users of this code to contribute improvements
+ * to the Coda project http://www.coda.cs.cmu.edu/ <coda@cs.cmu.edu>.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+#include <linux/string.h>
+#include <linux/list.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_cache.h>
+
+static atomic_t permission_epoch = ATOMIC_INIT(0);
+
+/* replace or extend an acl cache hit */
+void coda_cache_enter(struct inode *inode, int mask)
+{
+	struct coda_inode_info *cii = ITOC(inode);
+
+	cii->c_cached_epoch = atomic_read(&permission_epoch);
+	if (cii->c_uid != current->fsuid) {
+                cii->c_uid = current->fsuid;
+                cii->c_cached_perm = mask;
+        } else
+                cii->c_cached_perm |= mask;
+}
+
+/* remove cached acl from an inode */
+void coda_cache_clear_inode(struct inode *inode)
+{
+	struct coda_inode_info *cii = ITOC(inode);
+        cii->c_cached_perm = 0;
+}
+
+/* remove all acl caches */
+void coda_cache_clear_all(struct super_block *sb)
+{
+        struct coda_sb_info *sbi;
+
+        sbi = coda_sbp(sb);
+        if (!sbi) BUG();
+
+	atomic_inc(&permission_epoch);
+}
+
+
+/* check if the mask has been matched against the acl already */
+int coda_cache_check(struct inode *inode, int mask)
+{
+	struct coda_inode_info *cii = ITOC(inode);
+        int hit;
+	
+        hit = (mask & cii->c_cached_perm) == mask &&
+		cii->c_uid == current->fsuid &&
+		cii->c_cached_epoch == atomic_read(&permission_epoch);
+
+        return hit;
+}
+
+
+/* Purging dentries and children */
+/* The following routines drop dentries which are not
+   in use and flag dentries which are in use to be 
+   zapped later.
+
+   The flags are detected by:
+   - coda_dentry_revalidate (for lookups) if the flag is C_PURGE
+   - coda_dentry_delete: to remove dentry from the cache when d_count
+     falls to zero
+   - an inode method coda_revalidate (for attributes) if the 
+     flag is C_VATTR
+*/
+
+/* this won't do any harm: just flag all children */
+static void coda_flag_children(struct dentry *parent, int flag)
+{
+	struct list_head *child;
+	struct dentry *de;
+
+	spin_lock(&dcache_lock);
+	list_for_each(child, &parent->d_subdirs)
+	{
+		de = list_entry(child, struct dentry, d_child);
+		/* don't know what to do with negative dentries */
+		if ( ! de->d_inode ) 
+			continue;
+		coda_flag_inode(de->d_inode, flag);
+	}
+	spin_unlock(&dcache_lock);
+	return; 
+}
+
+void coda_flag_inode_children(struct inode *inode, int flag)
+{
+	struct dentry *alias_de;
+
+	if ( !inode || !S_ISDIR(inode->i_mode)) 
+		return; 
+
+	alias_de = d_find_alias(inode);
+	if (!alias_de)
+		return;
+	coda_flag_children(alias_de, flag);
+	shrink_dcache_parent(alias_de);
+	dput(alias_de);
+}
+

fs/coda/cnode.c

@@ -0,0 +1,172 @@
+/* cnode related routines for the coda kernel code
+   (C) 1996 Peter Braam
+   */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/time.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_psdev.h>
+
+static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
+{
+	return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
+}
+
+static struct inode_operations coda_symlink_inode_operations = {
+	.readlink	= generic_readlink,
+	.follow_link	= page_follow_link_light,
+	.put_link	= page_put_link,
+	.setattr	= coda_setattr,
+};
+
+/* cnode.c */
+static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
+{
+        coda_vattr_to_iattr(inode, attr);
+
+        if (S_ISREG(inode->i_mode)) {
+                inode->i_op = &coda_file_inode_operations;
+                inode->i_fop = &coda_file_operations;
+        } else if (S_ISDIR(inode->i_mode)) {
+                inode->i_op = &coda_dir_inode_operations;
+                inode->i_fop = &coda_dir_operations;
+        } else if (S_ISLNK(inode->i_mode)) {
+		inode->i_op = &coda_symlink_inode_operations;
+		inode->i_data.a_ops = &coda_symlink_aops;
+		inode->i_mapping = &inode->i_data;
+	} else
+                init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));
+}
+
+static int coda_test_inode(struct inode *inode, void *data)
+{
+	struct CodaFid *fid = (struct CodaFid *)data;
+	return coda_fideq(&(ITOC(inode)->c_fid), fid);
+}
+
+static int coda_set_inode(struct inode *inode, void *data)
+{
+	struct CodaFid *fid = (struct CodaFid *)data;
+	ITOC(inode)->c_fid = *fid;
+	return 0;
+}
+
+static int coda_fail_inode(struct inode *inode, void *data)
+{
+	return -1;
+}
+
+struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
+			 struct coda_vattr * attr)
+{
+	struct inode *inode;
+	struct coda_inode_info *cii;
+	unsigned long hash = coda_f2i(fid);
+
+	inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
+
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	if (inode->i_state & I_NEW) {
+		cii = ITOC(inode);
+		/* we still need to set i_ino for things like stat(2) */
+		inode->i_ino = hash;
+		cii->c_mapcount = 0;
+		unlock_new_inode(inode);
+	}
+
+	/* always replace the attributes, type might have changed */
+	coda_fill_inode(inode, attr);
+	return inode;
+}
+
+/* this is effectively coda_iget:
+   - get attributes (might be cached)
+   - get the inode for the fid using vfs iget
+   - link the two up if this is needed
+   - fill in the attributes
+*/
+int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb)
+{
+        struct coda_vattr attr;
+        int error;
+        
+	/* We get inode numbers from Venus -- see venus source */
+	error = venus_getattr(sb, fid, &attr);
+	if ( error ) {
+	    *inode = NULL;
+	    return error;
+	} 
+
+	*inode = coda_iget(sb, fid, &attr);
+	if ( IS_ERR(*inode) ) {
+		printk("coda_cnode_make: coda_iget failed\n");
+                return PTR_ERR(*inode);
+        }
+	return 0;
+}
+
+
+void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, 
+		      struct CodaFid *newfid)
+{
+	struct coda_inode_info *cii;
+	unsigned long hash = coda_f2i(newfid);
+	
+	cii = ITOC(inode);
+
+	if (!coda_fideq(&cii->c_fid, oldfid))
+		BUG();
+
+	/* replace fid and rehash inode */
+	/* XXX we probably need to hold some lock here! */
+	remove_inode_hash(inode);
+	cii->c_fid = *newfid;
+	inode->i_ino = hash;
+	__insert_inode_hash(inode, hash);
+}
+
+/* convert a fid to an inode. */
+struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) 
+{
+	struct inode *inode;
+	unsigned long hash = coda_f2i(fid);
+
+	if ( !sb ) {
+		printk("coda_fid_to_inode: no sb!\n");
+		return NULL;
+	}
+
+	inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
+	if ( !inode )
+		return NULL;
+
+	/* we should never see newly created inodes because we intentionally
+	 * fail in the initialization callback */
+	BUG_ON(inode->i_state & I_NEW);
+
+	return inode;
+}
+
+/* the CONTROL inode is made without asking attributes from Venus */
+int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
+{
+	int error = -ENOMEM;
+
+	*inode = new_inode(sb);
+	if (*inode) {
+		(*inode)->i_ino = CTL_INO;
+		(*inode)->i_op = &coda_ioctl_inode_operations;
+		(*inode)->i_fop = &coda_ioctl_operations;
+		(*inode)->i_mode = 0444;
+		error = 0;
+	}
+
+	return error;
+}
+

fs/coda/coda_linux.c

@@ -0,0 +1,197 @@
+/*
+ * Inode operations for Coda filesystem
+ * Original version: (C) 1996 P. Braam and M. Callahan
+ * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
+ * 
+ * Carnegie Mellon encourages users to contribute improvements to
+ * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+#include <linux/string.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_fs_i.h>
+
+/* initialize the debugging variables */
+int coda_fake_statfs;
+
+/* print a fid */
+char * coda_f2s(struct CodaFid *f)
+{
+	static char s[60];
+#ifdef CONFIG_CODA_FS_OLD_API
+ 	sprintf(s, "(%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2]);
+#else
+ 	sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
+#endif
+	return s;
+}
+
+/* recognize special .CONTROL name */
+int coda_iscontrol(const char *name, size_t length)
+{
+	return ((CODA_CONTROLLEN == length) && 
+                (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
+}
+
+/* recognize /coda inode */
+int coda_isroot(struct inode *i)
+{
+    return ( i->i_sb->s_root->d_inode == i );
+}
+
+unsigned short coda_flags_to_cflags(unsigned short flags)
+{
+	unsigned short coda_flags = 0;
+	
+	if ((flags & O_ACCMODE) == O_RDONLY)
+		coda_flags |= C_O_READ;
+
+	if ((flags & O_ACCMODE) == O_RDWR)
+		coda_flags |= C_O_READ | C_O_WRITE;
+
+	if ((flags & O_ACCMODE) == O_WRONLY)
+		coda_flags |= C_O_WRITE;
+
+	if (flags & O_TRUNC)
+		coda_flags |= C_O_TRUNC;
+
+	if (flags & O_CREAT)
+		coda_flags |= C_O_CREAT;
+
+	if (flags & O_EXCL)
+		coda_flags |= C_O_EXCL;
+
+	return coda_flags;
+}
+
+
+/* utility functions below */
+void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
+{
+        int inode_type;
+        /* inode's i_flags, i_ino are set by iget 
+           XXX: is this all we need ??
+           */
+        switch (attr->va_type) {
+        case C_VNON:
+                inode_type  = 0;
+                break;
+        case C_VREG:
+                inode_type = S_IFREG;
+                break;
+        case C_VDIR:
+                inode_type = S_IFDIR;
+                break;
+        case C_VLNK:
+                inode_type = S_IFLNK;
+                break;
+        default:
+                inode_type = 0;
+        }
+	inode->i_mode |= inode_type;
+
+	if (attr->va_mode != (u_short) -1)
+	        inode->i_mode = attr->va_mode | inode_type;
+        if (attr->va_uid != -1) 
+	        inode->i_uid = (uid_t) attr->va_uid;
+        if (attr->va_gid != -1)
+	        inode->i_gid = (gid_t) attr->va_gid;
+	if (attr->va_nlink != -1)
+	        inode->i_nlink = attr->va_nlink;
+	if (attr->va_size != -1)
+	        inode->i_size = attr->va_size;
+	if (attr->va_blocksize != -1)
+		inode->i_blksize = attr->va_blocksize;
+	if (attr->va_size != -1)
+		inode->i_blocks = (attr->va_size + 511) >> 9;
+	if (attr->va_atime.tv_sec != -1) 
+	        inode->i_atime = attr->va_atime;
+	if (attr->va_mtime.tv_sec != -1)
+	        inode->i_mtime = attr->va_mtime;
+        if (attr->va_ctime.tv_sec != -1)
+	        inode->i_ctime = attr->va_ctime;
+}
+
+
+/* 
+ * BSD sets attributes that need not be modified to -1. 
+ * Linux uses the valid field to indicate what should be
+ * looked at.  The BSD type field needs to be deduced from linux 
+ * mode.
+ * So we have to do some translations here.
+ */
+
+void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
+{
+        unsigned int valid;
+
+        /* clean out */        
+        vattr->va_mode = (umode_t) -1;
+        vattr->va_uid = (vuid_t) -1; 
+        vattr->va_gid = (vgid_t) -1;
+        vattr->va_size = (off_t) -1;
+	vattr->va_atime.tv_sec = (time_t) -1;
+	vattr->va_atime.tv_nsec =  (time_t) -1;
+        vattr->va_mtime.tv_sec = (time_t) -1;
+        vattr->va_mtime.tv_nsec = (time_t) -1;
+	vattr->va_ctime.tv_sec = (time_t) -1;
+	vattr->va_ctime.tv_nsec = (time_t) -1;
+        vattr->va_type = C_VNON;
+	vattr->va_fileid = -1;
+	vattr->va_gen = -1;
+	vattr->va_bytes = -1;
+	vattr->va_nlink = -1;
+	vattr->va_blocksize = -1;
+	vattr->va_rdev = -1;
+        vattr->va_flags = 0;
+
+        /* determine the type */
+#if 0
+        mode = iattr->ia_mode;
+                if ( S_ISDIR(mode) ) {
+                vattr->va_type = C_VDIR; 
+        } else if ( S_ISREG(mode) ) {
+                vattr->va_type = C_VREG;
+        } else if ( S_ISLNK(mode) ) {
+                vattr->va_type = C_VLNK;
+        } else {
+                /* don't do others */
+                vattr->va_type = C_VNON;
+        }
+#endif 
+
+        /* set those vattrs that need change */
+        valid = iattr->ia_valid;
+        if ( valid & ATTR_MODE ) {
+                vattr->va_mode = iattr->ia_mode;
+	}
+        if ( valid & ATTR_UID ) {
+                vattr->va_uid = (vuid_t) iattr->ia_uid;
+	}
+        if ( valid & ATTR_GID ) {
+                vattr->va_gid = (vgid_t) iattr->ia_gid;
+	}
+        if ( valid & ATTR_SIZE ) {
+                vattr->va_size = iattr->ia_size;
+	}
+        if ( valid & ATTR_ATIME ) {
+                vattr->va_atime = iattr->ia_atime;
+	}
+        if ( valid & ATTR_MTIME ) {
+                vattr->va_mtime = iattr->ia_mtime;
+	}
+        if ( valid & ATTR_CTIME ) {
+                vattr->va_ctime = iattr->ia_ctime;
+	}
+}
+

fs/coda/dir.c

@@ -0,0 +1,704 @@
+
+/*
+ * Directory operations for Coda filesystem
+ * Original version: (C) 1996 P. Braam and M. Callahan
+ * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
+ * 
+ * Carnegie Mellon encourages users to contribute improvements to
+ * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+
+#include <asm/uaccess.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_cache.h>
+#include <linux/coda_proc.h>
+
+/* dir inode-ops */
+static int coda_create(struct inode *dir, struct dentry *new, int mode, struct nameidata *nd);
+static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, struct nameidata *nd);
+static int coda_link(struct dentry *old_dentry, struct inode *dir_inode, 
+		     struct dentry *entry);
+static int coda_unlink(struct inode *dir_inode, struct dentry *entry);
+static int coda_symlink(struct inode *dir_inode, struct dentry *entry,
+			const char *symname);
+static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, int mode);
+static int coda_rmdir(struct inode *dir_inode, struct dentry *entry);
+static int coda_rename(struct inode *old_inode, struct dentry *old_dentry, 
+                       struct inode *new_inode, struct dentry *new_dentry);
+
+/* dir file-ops */
+static int coda_readdir(struct file *file, void *dirent, filldir_t filldir);
+
+/* dentry ops */
+static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd);
+static int coda_dentry_delete(struct dentry *);
+
+/* support routines */
+static int coda_venus_readdir(struct file *filp, filldir_t filldir,
+			      void *dirent, struct dentry *dir);
+int coda_fsync(struct file *, struct dentry *dentry, int datasync);
+
+/* same as fs/bad_inode.c */
+static int coda_return_EIO(void)
+{
+	return -EIO;
+}
+#define CODA_EIO_ERROR ((void *) (coda_return_EIO))
+
+static struct dentry_operations coda_dentry_operations =
+{
+	.d_revalidate	= coda_dentry_revalidate,
+	.d_delete	= coda_dentry_delete,
+};
+
+struct inode_operations coda_dir_inode_operations =
+{
+	.create		= coda_create,
+	.lookup		= coda_lookup,
+	.link		= coda_link,
+	.unlink		= coda_unlink,
+	.symlink	= coda_symlink,
+	.mkdir		= coda_mkdir,
+	.rmdir		= coda_rmdir,
+	.mknod		= CODA_EIO_ERROR,
+	.rename		= coda_rename,
+	.permission	= coda_permission,
+	.getattr	= coda_getattr,
+	.setattr	= coda_setattr,
+};
+
+struct file_operations coda_dir_operations = {
+	.llseek		= generic_file_llseek,
+	.read		= generic_read_dir,
+	.readdir	= coda_readdir,
+	.open		= coda_open,
+	.flush		= coda_flush,
+	.release	= coda_release,
+	.fsync		= coda_fsync,
+};
+
+
+/* inode operations for directories */
+/* access routines: lookup, readlink, permission */
+static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd)
+{
+	struct inode *res_inode = NULL;
+	struct CodaFid resfid = { { 0, } };
+	int dropme = 0; /* to indicate entry should not be cached */
+	int type = 0;
+	int error = 0;
+	const char *name = entry->d_name.name;
+	size_t length = entry->d_name.len;
+	
+	if ( length > CODA_MAXNAMLEN ) {
+	        printk("name too long: lookup, %s (%*s)\n", 
+		       coda_i2s(dir), (int)length, name);
+		return ERR_PTR(-ENAMETOOLONG);
+	}
+
+	lock_kernel();
+        /* control object, create inode on the fly */
+        if (coda_isroot(dir) && coda_iscontrol(name, length)) {
+	        error = coda_cnode_makectl(&res_inode, dir->i_sb);
+		dropme = 1;
+                goto exit;
+        }
+
+	error = venus_lookup(dir->i_sb, coda_i2f(dir), 
+			     (const char *)name, length, &type, &resfid);
+
+	res_inode = NULL;
+	if (!error) {
+		if (type & CODA_NOCACHE) {
+			type &= (~CODA_NOCACHE);
+			dropme = 1;
+		}
+
+	    	error = coda_cnode_make(&res_inode, &resfid, dir->i_sb);
+		if (error) {
+			unlock_kernel();
+			return ERR_PTR(error);
+		}
+	} else if (error != -ENOENT) {
+		unlock_kernel();
+		return ERR_PTR(error);
+	}
+
+exit:
+	entry->d_time = 0;
+	entry->d_op = &coda_dentry_operations;
+	d_add(entry, res_inode);
+	if ( dropme ) {
+		d_drop(entry);
+		coda_flag_inode(res_inode, C_VATTR);
+	}
+	unlock_kernel();
+        return NULL;
+}
+
+
+int coda_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+        int error = 0;
+ 
+	if (!mask)
+		return 0; 
+
+	lock_kernel();
+
+	coda_vfs_stat.permission++;
+
+	if (coda_cache_check(inode, mask))
+		goto out; 
+
+        error = venus_access(inode->i_sb, coda_i2f(inode), mask);
+    
+	if (!error)
+		coda_cache_enter(inode, mask);
+
+ out:
+	unlock_kernel();
+
+        return error; 
+}
+
+
+static inline void coda_dir_changed(struct inode *dir, int link)
+{
+#ifdef REQUERY_VENUS_FOR_MTIME
+	/* invalidate the directory cnode's attributes so we refetch the
+	 * attributes from venus next time the inode is referenced */
+	coda_flag_inode(dir, C_VATTR);
+#else
+	/* optimistically we can also act as if our nose bleeds. The
+         * granularity of the mtime is coarse anyways so we might actually be
+         * right most of the time. Note: we only do this for directories. */
+	dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+#endif
+	if (link)
+		dir->i_nlink += link;
+}
+
+/* creation routines: create, mknod, mkdir, link, symlink */
+static int coda_create(struct inode *dir, struct dentry *de, int mode, struct nameidata *nd)
+{
+        int error=0;
+	const char *name=de->d_name.name;
+	int length=de->d_name.len;
+	struct inode *inode;
+	struct CodaFid newfid;
+	struct coda_vattr attrs;
+
+	lock_kernel();
+	coda_vfs_stat.create++;
+
+	if (coda_isroot(dir) && coda_iscontrol(name, length)) {
+		unlock_kernel();
+		return -EPERM;
+	}
+
+	error = venus_create(dir->i_sb, coda_i2f(dir), name, length, 
+				0, mode, &newfid, &attrs);
+
+        if ( error ) {
+		unlock_kernel();
+		d_drop(de);
+		return error;
+	}
+
+	inode = coda_iget(dir->i_sb, &newfid, &attrs);
+	if ( IS_ERR(inode) ) {
+		unlock_kernel();
+		d_drop(de);
+		return PTR_ERR(inode);
+	}
+
+	/* invalidate the directory cnode's attributes */
+	coda_dir_changed(dir, 0);
+	unlock_kernel();
+	d_instantiate(de, inode);
+        return 0;
+}
+
+static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
+{
+	struct inode *inode;
+	struct coda_vattr attrs;
+	const char *name = de->d_name.name;
+	int len = de->d_name.len;
+	int error;
+	struct CodaFid newfid;
+
+	lock_kernel();
+	coda_vfs_stat.mkdir++;
+
+	if (coda_isroot(dir) && coda_iscontrol(name, len)) {
+		unlock_kernel();
+		return -EPERM;
+	}
+
+	attrs.va_mode = mode;
+	error = venus_mkdir(dir->i_sb, coda_i2f(dir), 
+			       name, len, &newfid, &attrs);
+        
+        if ( error ) {
+		unlock_kernel();
+		d_drop(de);
+		return error;
+        }
+         
+	inode = coda_iget(dir->i_sb, &newfid, &attrs);
+	if ( IS_ERR(inode) ) {
+		unlock_kernel();
+		d_drop(de);
+		return PTR_ERR(inode);
+	}
+	
+	/* invalidate the directory cnode's attributes */
+	coda_dir_changed(dir, 1);
+	unlock_kernel();
+	d_instantiate(de, inode);
+        return 0;
+}
+
+/* try to make de an entry in dir_inodde linked to source_de */ 
+static int coda_link(struct dentry *source_de, struct inode *dir_inode, 
+	  struct dentry *de)
+{
+	struct inode *inode = source_de->d_inode;
+        const char * name = de->d_name.name;
+	int len = de->d_name.len;
+	int error;
+
+	lock_kernel();
+	coda_vfs_stat.link++;
+
+	if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
+		unlock_kernel();
+		return -EPERM;
+	}
+
+	error = venus_link(dir_inode->i_sb, coda_i2f(inode),
+			   coda_i2f(dir_inode), (const char *)name, len);
+
+	if (error) { 
+		d_drop(de);
+		goto out;
+	}
+
+	coda_dir_changed(dir_inode, 0);
+	atomic_inc(&inode->i_count);
+	d_instantiate(de, inode);
+	inode->i_nlink++;
+        
+out:
+	unlock_kernel();
+	return(error);
+}
+
+
+static int coda_symlink(struct inode *dir_inode, struct dentry *de,
+			const char *symname)
+{
+        const char *name = de->d_name.name;
+	int len = de->d_name.len;
+	int symlen;
+        int error=0;
+        
+	lock_kernel();
+	coda_vfs_stat.symlink++;
+
+	if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) {
+		unlock_kernel();
+		return -EPERM;
+	}
+
+	symlen = strlen(symname);
+	if ( symlen > CODA_MAXPATHLEN ) {
+		unlock_kernel();
+		return -ENAMETOOLONG;
+	}
+
+	/*
+	 * This entry is now negative. Since we do not create
+	 * an inode for the entry we have to drop it. 
+	 */
+	d_drop(de);
+	error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, 
+			      symname, symlen);
+
+	/* mtime is no good anymore */
+	if ( !error )
+		coda_dir_changed(dir_inode, 0);
+
+	unlock_kernel();
+        return error;
+}
+
+/* destruction routines: unlink, rmdir */
+int coda_unlink(struct inode *dir, struct dentry *de)
+{
+        int error;
+	const char *name = de->d_name.name;
+	int len = de->d_name.len;
+
+	lock_kernel();
+	coda_vfs_stat.unlink++;
+
+        error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
+        if ( error ) {
+		unlock_kernel();
+                return error;
+        }
+
+	coda_dir_changed(dir, 0);
+	de->d_inode->i_nlink--;
+	unlock_kernel();
+
+        return 0;
+}
+
+int coda_rmdir(struct inode *dir, struct dentry *de)
+{
+	const char *name = de->d_name.name;
+	int len = de->d_name.len;
+        int error;
+
+	lock_kernel();
+	coda_vfs_stat.rmdir++;
+
+	if (!d_unhashed(de)) {
+		unlock_kernel();
+		return -EBUSY;
+	}
+	error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
+
+        if ( error ) {
+		unlock_kernel();
+                return error;
+        }
+
+	coda_dir_changed(dir, -1);
+	de->d_inode->i_nlink--;
+	d_delete(de);
+	unlock_kernel();
+
+        return 0;
+}
+
+/* rename */
+static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, 
+		       struct inode *new_dir, struct dentry *new_dentry)
+{
+        const char *old_name = old_dentry->d_name.name;
+        const char *new_name = new_dentry->d_name.name;
+	int old_length = old_dentry->d_name.len;
+	int new_length = new_dentry->d_name.len;
+        int link_adjust = 0;
+        int error;
+
+	lock_kernel();
+	coda_vfs_stat.rename++;
+
+        error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), 
+			     coda_i2f(new_dir), old_length, new_length, 
+			     (const char *) old_name, (const char *)new_name);
+
+        if ( !error ) {
+		if ( new_dentry->d_inode ) {
+			if ( S_ISDIR(new_dentry->d_inode->i_mode) )
+                        	link_adjust = 1;
+
+                        coda_dir_changed(old_dir, -link_adjust);
+                        coda_dir_changed(new_dir,  link_adjust);
+			coda_flag_inode(new_dentry->d_inode, C_VATTR);
+		} else {
+			coda_flag_inode(old_dir, C_VATTR);
+			coda_flag_inode(new_dir, C_VATTR);
+                }
+	}
+	unlock_kernel();
+
+	return error;
+}
+
+
+/* file operations for directories */
+int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
+{
+	struct dentry *coda_dentry = coda_file->f_dentry;
+	struct coda_file_info *cfi;
+	struct file *host_file;
+	struct inode *host_inode;
+	int ret;
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+	host_file = cfi->cfi_container;
+
+	coda_vfs_stat.readdir++;
+
+	host_inode = host_file->f_dentry->d_inode;
+	down(&host_inode->i_sem);
+	host_file->f_pos = coda_file->f_pos;
+
+	if (!host_file->f_op->readdir) {
+		/* Venus: we must read Venus dirents from the file */
+		ret = coda_venus_readdir(host_file, filldir, dirent, coda_dentry);
+	} else {
+		/* potemkin case: we were handed a directory inode. */
+		/* Yuk, we can't call vfs_readdir because we are already
+		 * holding the inode semaphore. */
+		ret = -ENOTDIR;
+		if (!host_file->f_op || !host_file->f_op->readdir)
+			goto out;
+
+		ret = -ENOENT;
+		if (!IS_DEADDIR(host_inode)) {
+			ret = host_file->f_op->readdir(host_file, filldir, dirent);
+			file_accessed(host_file);
+		}
+	}
+out:
+	coda_file->f_pos = host_file->f_pos;
+	up(&host_inode->i_sem);
+
+	return ret;
+}
+
+static inline unsigned int CDT2DT(unsigned char cdt)
+{
+	unsigned int dt;
+
+	switch(cdt) {
+	case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
+	case CDT_FIFO:	  dt = DT_FIFO;    break;
+	case CDT_CHR:	  dt = DT_CHR;     break;
+	case CDT_DIR:	  dt = DT_DIR;     break;
+	case CDT_BLK:	  dt = DT_BLK;     break;
+	case CDT_REG:	  dt = DT_REG;     break;
+	case CDT_LNK:	  dt = DT_LNK;     break;
+	case CDT_SOCK:	  dt = DT_SOCK;    break;
+	case CDT_WHT:	  dt = DT_WHT;     break;
+	default:	  dt = DT_UNKNOWN; break;
+	}
+	return dt;
+}
+
+/* support routines */
+static int coda_venus_readdir(struct file *filp, filldir_t filldir,
+			      void *dirent, struct dentry *dir)
+{
+	int result = 0; /* # of entries returned */
+	struct venus_dirent *vdir;
+	unsigned long vdir_size =
+	    (unsigned long)(&((struct venus_dirent *)0)->d_name);
+	unsigned int type;
+	struct qstr name;
+	ino_t ino;
+	int ret, i;
+
+	vdir = (struct venus_dirent *)kmalloc(sizeof(*vdir), GFP_KERNEL);
+	if (!vdir) return -ENOMEM;
+
+	i = filp->f_pos;
+	switch(i) {
+	case 0:
+		ret = filldir(dirent, ".", 1, 0, dir->d_inode->i_ino, DT_DIR);
+		if (ret < 0) break;
+		result++;
+		filp->f_pos++;
+		/* fallthrough */
+	case 1:
+		ret = filldir(dirent, "..", 2, 1, dir->d_parent->d_inode->i_ino, DT_DIR);
+		if (ret < 0) break;
+		result++;
+		filp->f_pos++;
+		/* fallthrough */
+	default:
+	while (1) {
+		/* read entries from the directory file */
+		ret = kernel_read(filp, filp->f_pos - 2, (char *)vdir,
+				  sizeof(*vdir));
+		if (ret < 0) {
+			printk("coda_venus_readdir: read dir failed %d\n", ret);
+			break;
+		}
+		if (ret == 0) break; /* end of directory file reached */
+
+		/* catch truncated reads */
+		if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
+			printk("coda_venus_readdir: short read: %ld\n",
+			       filp->f_dentry->d_inode->i_ino);
+			ret = -EBADF;
+			break;
+		}
+		/* validate whether the directory file actually makes sense */
+		if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
+			printk("coda_venus_readdir: Invalid dir: %ld\n",
+			       filp->f_dentry->d_inode->i_ino);
+			ret = -EBADF;
+			break;
+		}
+
+		name.len = vdir->d_namlen;
+		name.name = vdir->d_name;
+
+		/* Make sure we skip '.' and '..', we already got those */
+		if (name.name[0] == '.' && (name.len == 1 ||
+		    (vdir->d_name[1] == '.' && name.len == 2)))
+			vdir->d_fileno = name.len = 0;
+
+		/* skip null entries */
+		if (vdir->d_fileno && name.len) {
+			/* try to look up this entry in the dcache, that way
+			 * userspace doesn't have to worry about breaking
+			 * getcwd by having mismatched inode numbers for
+			 * internal volume mountpoints. */
+			ino = find_inode_number(dir, &name);
+			if (!ino) ino = vdir->d_fileno;
+
+			type = CDT2DT(vdir->d_type);
+			ret = filldir(dirent, name.name, name.len, filp->f_pos,
+				      ino, type); 
+			/* failure means no space for filling in this round */
+			if (ret < 0) break;
+			result++;
+		}
+		/* we'll always have progress because d_reclen is unsigned and
+		 * we've already established it is non-zero. */
+		filp->f_pos += vdir->d_reclen;
+	}
+	} 
+	kfree(vdir);
+	return result ? result : ret;
+}
+
+/* called when a cache lookup succeeds */
+static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd)
+{
+	struct inode *inode = de->d_inode;
+	struct coda_inode_info *cii;
+
+	if (!inode)
+		return 1;
+	lock_kernel();
+	if (coda_isroot(inode))
+		goto out;
+	if (is_bad_inode(inode))
+		goto bad;
+
+	cii = ITOC(de->d_inode);
+	if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
+		goto out;
+
+	shrink_dcache_parent(de);
+
+	/* propagate for a flush */
+	if (cii->c_flags & C_FLUSH) 
+		coda_flag_inode_children(inode, C_FLUSH);
+
+	if (atomic_read(&de->d_count) > 1)
+		/* pretend it's valid, but don't change the flags */
+		goto out;
+
+	/* clear the flags. */
+	cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
+
+bad:
+	unlock_kernel();
+	return 0;
+out:
+	unlock_kernel();
+	return 1;
+}
+
+/*
+ * This is the callback from dput() when d_count is going to 0.
+ * We use this to unhash dentries with bad inodes.
+ */
+static int coda_dentry_delete(struct dentry * dentry)
+{
+	int flags;
+
+	if (!dentry->d_inode) 
+		return 0;
+
+	flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE;
+	if (is_bad_inode(dentry->d_inode) || flags) {
+		return 1;
+	}
+	return 0;
+}
+
+
+
+/*
+ * This is called when we want to check if the inode has
+ * changed on the server.  Coda makes this easy since the
+ * cache manager Venus issues a downcall to the kernel when this 
+ * happens 
+ */
+int coda_revalidate_inode(struct dentry *dentry)
+{
+	struct coda_vattr attr;
+	int error = 0;
+	int old_mode;
+	ino_t old_ino;
+	struct inode *inode = dentry->d_inode;
+	struct coda_inode_info *cii = ITOC(inode);
+
+	lock_kernel();
+	if ( !cii->c_flags )
+		goto ok;
+
+	if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
+		error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
+		if ( error )
+			goto return_bad;
+
+		/* this inode may be lost if:
+		   - it's ino changed 
+		   - type changes must be permitted for repair and
+		   missing mount points.
+		*/
+		old_mode = inode->i_mode;
+		old_ino = inode->i_ino;
+		coda_vattr_to_iattr(inode, &attr);
+
+		if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
+			printk("Coda: inode %ld, fid %s changed type!\n",
+			       inode->i_ino, coda_f2s(&(cii->c_fid)));
+		}
+
+		/* the following can happen when a local fid is replaced 
+		   with a global one, here we lose and declare the inode bad */
+		if (inode->i_ino != old_ino)
+			goto return_bad;
+		
+		coda_flag_inode_children(inode, C_FLUSH);
+		cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
+	}
+
+ok:
+	unlock_kernel();
+	return 0;
+
+return_bad:
+	unlock_kernel();
+	return -EIO;
+}

fs/coda/file.c

@@ -0,0 +1,300 @@
+/*
+ * File operations for Coda.
+ * Original version: (C) 1996 Peter Braam 
+ * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
+ *
+ * Carnegie Mellon encourages users of this code to contribute improvements
+ * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/smp_lock.h>
+#include <linux/string.h>
+#include <asm/uaccess.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_proc.h>
+
+/* if CODA_STORE fails with EOPNOTSUPP, venus clearly doesn't support
+ * CODA_STORE/CODA_RELEASE and we fall back on using the CODA_CLOSE upcall */
+static int use_coda_close;
+
+static ssize_t
+coda_file_read(struct file *coda_file, char __user *buf, size_t count, loff_t *ppos)
+{
+	struct coda_file_info *cfi;
+	struct file *host_file;
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+	host_file = cfi->cfi_container;
+
+	if (!host_file->f_op || !host_file->f_op->read)
+		return -EINVAL;
+
+	return host_file->f_op->read(host_file, buf, count, ppos);
+}
+
+static ssize_t
+coda_file_sendfile(struct file *coda_file, loff_t *ppos, size_t count,
+		   read_actor_t actor, void *target)
+{
+	struct coda_file_info *cfi;
+	struct file *host_file;
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+	host_file = cfi->cfi_container;
+
+	if (!host_file->f_op || !host_file->f_op->sendfile)
+		return -EINVAL;
+
+	return host_file->f_op->sendfile(host_file, ppos, count, actor, target);
+}
+
+static ssize_t
+coda_file_write(struct file *coda_file, const char __user *buf, size_t count, loff_t *ppos)
+{
+	struct inode *host_inode, *coda_inode = coda_file->f_dentry->d_inode;
+	struct coda_file_info *cfi;
+	struct file *host_file;
+	ssize_t ret;
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+	host_file = cfi->cfi_container;
+
+	if (!host_file->f_op || !host_file->f_op->write)
+		return -EINVAL;
+
+	host_inode = host_file->f_dentry->d_inode;
+	down(&coda_inode->i_sem);
+
+	ret = host_file->f_op->write(host_file, buf, count, ppos);
+
+	coda_inode->i_size = host_inode->i_size;
+	coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
+	coda_inode->i_mtime = coda_inode->i_ctime = CURRENT_TIME_SEC;
+	up(&coda_inode->i_sem);
+
+	return ret;
+}
+
+static int
+coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma)
+{
+	struct coda_file_info *cfi;
+	struct coda_inode_info *cii;
+	struct file *host_file;
+	struct inode *coda_inode, *host_inode;
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+	host_file = cfi->cfi_container;
+
+	if (!host_file->f_op || !host_file->f_op->mmap)
+		return -ENODEV;
+
+	coda_inode = coda_file->f_dentry->d_inode;
+	host_inode = host_file->f_dentry->d_inode;
+	coda_file->f_mapping = host_file->f_mapping;
+	if (coda_inode->i_mapping == &coda_inode->i_data)
+		coda_inode->i_mapping = host_inode->i_mapping;
+
+	/* only allow additional mmaps as long as userspace isn't changing
+	 * the container file on us! */
+	else if (coda_inode->i_mapping != host_inode->i_mapping)
+		return -EBUSY;
+
+	/* keep track of how often the coda_inode/host_file has been mmapped */
+	cii = ITOC(coda_inode);
+	cii->c_mapcount++;
+	cfi->cfi_mapcount++;
+
+	return host_file->f_op->mmap(host_file, vma);
+}
+
+int coda_open(struct inode *coda_inode, struct file *coda_file)
+{
+	struct file *host_file = NULL;
+	int error;
+	unsigned short flags = coda_file->f_flags & (~O_EXCL);
+	unsigned short coda_flags = coda_flags_to_cflags(flags);
+	struct coda_file_info *cfi;
+
+	coda_vfs_stat.open++;
+
+	cfi = kmalloc(sizeof(struct coda_file_info), GFP_KERNEL);
+	if (!cfi) {
+		unlock_kernel();
+		return -ENOMEM;
+	}
+
+	lock_kernel();
+
+	error = venus_open(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
+			   &host_file); 
+	if (error || !host_file) {
+		kfree(cfi);
+		unlock_kernel();
+		return error;
+	}
+
+	host_file->f_flags |= coda_file->f_flags & (O_APPEND | O_SYNC);
+
+	cfi->cfi_magic = CODA_MAGIC;
+	cfi->cfi_mapcount = 0;
+	cfi->cfi_container = host_file;
+
+	BUG_ON(coda_file->private_data != NULL);
+	coda_file->private_data = cfi;
+
+	unlock_kernel();
+	return 0;
+}
+
+int coda_flush(struct file *coda_file)
+{
+	unsigned short flags = coda_file->f_flags & ~O_EXCL;
+	unsigned short coda_flags = coda_flags_to_cflags(flags);
+	struct coda_file_info *cfi;
+	struct inode *coda_inode;
+	int err = 0, fcnt;
+
+	lock_kernel();
+
+	coda_vfs_stat.flush++;
+
+	/* last close semantics */
+	fcnt = file_count(coda_file);
+	if (fcnt > 1)
+		goto out;
+
+	/* No need to make an upcall when we have not made any modifications
+	 * to the file */
+	if ((coda_file->f_flags & O_ACCMODE) == O_RDONLY)
+		goto out;
+
+	if (use_coda_close)
+		goto out;
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+
+	coda_inode = coda_file->f_dentry->d_inode;
+
+	err = venus_store(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
+			  coda_file->f_uid);
+
+	if (err == -EOPNOTSUPP) {
+		use_coda_close = 1;
+		err = 0;
+	}
+
+out:
+	unlock_kernel();
+	return err;
+}
+
+int coda_release(struct inode *coda_inode, struct file *coda_file)
+{
+	unsigned short flags = (coda_file->f_flags) & (~O_EXCL);
+	unsigned short coda_flags = coda_flags_to_cflags(flags);
+	struct coda_file_info *cfi;
+	struct coda_inode_info *cii;
+	struct inode *host_inode;
+	int err = 0;
+
+	lock_kernel();
+	coda_vfs_stat.release++;
+ 
+	if (!use_coda_close) {
+		err = venus_release(coda_inode->i_sb, coda_i2f(coda_inode),
+				    coda_flags);
+		if (err == -EOPNOTSUPP) {
+			use_coda_close = 1;
+			err = 0;
+		}
+	}
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+
+	if (use_coda_close)
+		err = venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
+				  coda_flags, coda_file->f_uid);
+
+	host_inode = cfi->cfi_container->f_dentry->d_inode;
+	cii = ITOC(coda_inode);
+
+	/* did we mmap this file? */
+	if (coda_inode->i_mapping == &host_inode->i_data) {
+		cii->c_mapcount -= cfi->cfi_mapcount;
+		if (!cii->c_mapcount)
+			coda_inode->i_mapping = &coda_inode->i_data;
+	}
+
+	fput(cfi->cfi_container);
+	kfree(coda_file->private_data);
+	coda_file->private_data = NULL;
+
+	unlock_kernel();
+	return err;
+}
+
+int coda_fsync(struct file *coda_file, struct dentry *coda_dentry, int datasync)
+{
+	struct file *host_file;
+	struct dentry *host_dentry;
+	struct inode *host_inode, *coda_inode = coda_dentry->d_inode;
+	struct coda_file_info *cfi;
+	int err = 0;
+
+	if (!(S_ISREG(coda_inode->i_mode) || S_ISDIR(coda_inode->i_mode) ||
+	      S_ISLNK(coda_inode->i_mode)))
+		return -EINVAL;
+
+	cfi = CODA_FTOC(coda_file);
+	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+	host_file = cfi->cfi_container;
+
+	coda_vfs_stat.fsync++;
+
+	if (host_file->f_op && host_file->f_op->fsync) {
+		host_dentry = host_file->f_dentry;
+		host_inode = host_dentry->d_inode;
+		down(&host_inode->i_sem);
+		err = host_file->f_op->fsync(host_file, host_dentry, datasync);
+		up(&host_inode->i_sem);
+	}
+
+	if ( !err && !datasync ) {
+		lock_kernel();
+		err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
+		unlock_kernel();
+	}
+
+	return err;
+}
+
+struct file_operations coda_file_operations = {
+	.llseek		= generic_file_llseek,
+	.read		= coda_file_read,
+	.write		= coda_file_write,
+	.mmap		= coda_file_mmap,
+	.open		= coda_open,
+	.flush		= coda_flush,
+	.release	= coda_release,
+	.fsync		= coda_fsync,
+	.sendfile	= coda_file_sendfile,
+};
+

fs/coda/inode.c

@@ -0,0 +1,321 @@
+/*
+ * Super block/filesystem wide operations
+ *
+ * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and 
+ * Michael Callahan <callahan@maths.ox.ac.uk> 
+ * 
+ * Rewritten for Linux 2.1.  Peter Braam <braam@cs.cmu.edu>
+ * Copyright (C) Carnegie Mellon University
+ */
+
+#include <linux/module.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/smp_lock.h>
+#include <linux/file.h>
+#include <linux/vfs.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include <linux/fs.h>
+#include <linux/vmalloc.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_cache.h>
+
+/* VFS super_block ops */
+static void coda_clear_inode(struct inode *);
+static void coda_put_super(struct super_block *);
+static int coda_statfs(struct super_block *sb, struct kstatfs *buf);
+
+static kmem_cache_t * coda_inode_cachep;
+
+static struct inode *coda_alloc_inode(struct super_block *sb)
+{
+	struct coda_inode_info *ei;
+	ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, SLAB_KERNEL);
+	if (!ei)
+		return NULL;
+	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
+	ei->c_flags = 0;
+	ei->c_uid = 0;
+	ei->c_cached_perm = 0;
+	return &ei->vfs_inode;
+}
+
+static void coda_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(coda_inode_cachep, ITOC(inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct coda_inode_info *ei = (struct coda_inode_info *) foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR)
+		inode_init_once(&ei->vfs_inode);
+}
+ 
+int coda_init_inodecache(void)
+{
+	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
+				sizeof(struct coda_inode_info),
+				0, SLAB_RECLAIM_ACCOUNT,
+				init_once, NULL);
+	if (coda_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+void coda_destroy_inodecache(void)
+{
+	if (kmem_cache_destroy(coda_inode_cachep))
+		printk(KERN_INFO "coda_inode_cache: not all structures were freed\n");
+}
+
+static int coda_remount(struct super_block *sb, int *flags, char *data)
+{
+	*flags |= MS_NODIRATIME;
+	return 0;
+}
+
+/* exported operations */
+static struct super_operations coda_super_operations =
+{
+	.alloc_inode	= coda_alloc_inode,
+	.destroy_inode	= coda_destroy_inode,
+	.clear_inode	= coda_clear_inode,
+	.put_super	= coda_put_super,
+	.statfs		= coda_statfs,
+	.remount_fs	= coda_remount,
+};
+
+static int get_device_index(struct coda_mount_data *data)
+{
+	struct file *file;
+	struct inode *inode;
+	int idx;
+
+	if(data == NULL) {
+		printk("coda_read_super: Bad mount data\n");
+		return -1;
+	}
+
+	if(data->version != CODA_MOUNT_VERSION) {
+		printk("coda_read_super: Bad mount version\n");
+		return -1;
+	}
+
+	file = fget(data->fd);
+	inode = NULL;
+	if(file)
+		inode = file->f_dentry->d_inode;
+	
+	if(!inode || !S_ISCHR(inode->i_mode) ||
+	   imajor(inode) != CODA_PSDEV_MAJOR) {
+		if(file)
+			fput(file);
+
+		printk("coda_read_super: Bad file\n");
+		return -1;
+	}
+
+	idx = iminor(inode);
+	fput(file);
+
+	if(idx < 0 || idx >= MAX_CODADEVS) {
+		printk("coda_read_super: Bad minor number\n");
+		return -1;
+	}
+
+	return idx;
+}
+
+static int coda_fill_super(struct super_block *sb, void *data, int silent)
+{
+        struct inode *root = NULL; 
+	struct coda_sb_info *sbi = NULL;
+	struct venus_comm *vc = NULL;
+	struct CodaFid fid;
+        int error;
+	int idx;
+
+	idx = get_device_index((struct coda_mount_data *) data);
+
+	/* Ignore errors in data, for backward compatibility */
+	if(idx == -1)
+		idx = 0;
+	
+	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
+
+	vc = &coda_comms[idx];
+	if (!vc->vc_inuse) {
+		printk("coda_read_super: No pseudo device\n");
+		return -EINVAL;
+	}
+
+        if ( vc->vc_sb ) {
+		printk("coda_read_super: Device already mounted\n");
+		return -EBUSY;
+	}
+
+	sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
+	if(!sbi) {
+		return -ENOMEM;
+	}
+
+	vc->vc_sb = sb;
+
+	sbi->sbi_vcomm = vc;
+
+        sb->s_fs_info = sbi;
+	sb->s_flags |= MS_NODIRATIME; /* probably even noatime */
+        sb->s_blocksize = 1024;	/* XXXXX  what do we put here?? */
+        sb->s_blocksize_bits = 10;
+        sb->s_magic = CODA_SUPER_MAGIC;
+        sb->s_op = &coda_super_operations;
+
+	/* get root fid from Venus: this needs the root inode */
+	error = venus_rootfid(sb, &fid);
+	if ( error ) {
+	        printk("coda_read_super: coda_get_rootfid failed with %d\n",
+		       error);
+		goto error;
+	}
+	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
+	
+	/* make root inode */
+        error = coda_cnode_make(&root, &fid, sb);
+        if ( error || !root ) {
+	    printk("Failure of coda_cnode_make for root: error %d\n", error);
+	    goto error;
+	} 
+
+	printk("coda_read_super: rootinode is %ld dev %s\n", 
+	       root->i_ino, root->i_sb->s_id);
+	sb->s_root = d_alloc_root(root);
+	if (!sb->s_root)
+		goto error;
+        return 0;
+
+ error:
+	if (sbi) {
+		kfree(sbi);
+		if(vc)
+			vc->vc_sb = NULL;		
+	}
+	if (root)
+                iput(root);
+
+        return -EINVAL;
+}
+
+static void coda_put_super(struct super_block *sb)
+{
+        struct coda_sb_info *sbi;
+
+	sbi = coda_sbp(sb);
+	sbi->sbi_vcomm->vc_sb = NULL;
+
+	printk("Coda: Bye bye.\n");
+	kfree(sbi);
+}
+
+static void coda_clear_inode(struct inode *inode)
+{
+	coda_cache_clear_inode(inode);
+}
+
+int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+	int err = coda_revalidate_inode(dentry);
+	if (!err)
+		generic_fillattr(dentry->d_inode, stat);
+	return err;
+}
+
+int coda_setattr(struct dentry *de, struct iattr *iattr)
+{
+	struct inode *inode = de->d_inode;
+	struct coda_vattr vattr;
+	int error;
+
+	lock_kernel();
+	
+	memset(&vattr, 0, sizeof(vattr)); 
+
+	inode->i_ctime = CURRENT_TIME_SEC;
+	coda_iattr_to_vattr(iattr, &vattr);
+	vattr.va_type = C_VNON; /* cannot set type */
+
+	/* Venus is responsible for truncating the container-file!!! */
+	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
+
+	if ( !error ) {
+	        coda_vattr_to_iattr(inode, &vattr); 
+		coda_cache_clear_inode(inode);
+	}
+
+	unlock_kernel();
+
+	return error;
+}
+
+struct inode_operations coda_file_inode_operations = {
+	.permission	= coda_permission,
+	.getattr	= coda_getattr,
+	.setattr	= coda_setattr,
+};
+
+static int coda_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+	int error;
+	
+	lock_kernel();
+
+	error = venus_statfs(sb, buf);
+
+	unlock_kernel();
+
+	if (error) {
+		/* fake something like AFS does */
+		buf->f_blocks = 9000000;
+		buf->f_bfree  = 9000000;
+		buf->f_bavail = 9000000;
+		buf->f_files  = 9000000;
+		buf->f_ffree  = 9000000;
+	}
+
+	/* and fill in the rest */
+	buf->f_type = CODA_SUPER_MAGIC;
+	buf->f_bsize = 1024;
+	buf->f_namelen = CODA_MAXNAMLEN;
+
+	return 0; 
+}
+
+/* init_coda: used by filesystems.c to register coda */
+
+static struct super_block *coda_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return get_sb_nodev(fs_type, flags, data, coda_fill_super);
+}
+
+struct file_system_type coda_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "coda",
+	.get_sb		= coda_get_sb,
+	.kill_sb	= kill_anon_super,
+	.fs_flags	= FS_BINARY_MOUNTDATA,
+};
+

fs/coda/pioctl.c

@@ -0,0 +1,95 @@
+/*
+ * Pioctl operations for Coda.
+ * Original version: (C) 1996 Peter Braam 
+ * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
+ *
+ * Carnegie Mellon encourages users of this code to contribute improvements
+ * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/namei.h>
+#include <linux/module.h>
+#include <asm/uaccess.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_psdev.h>
+
+/* pioctl ops */
+static int coda_ioctl_permission(struct inode *inode, int mask,
+				 struct nameidata *nd);
+static int coda_pioctl(struct inode * inode, struct file * filp, 
+                       unsigned int cmd, unsigned long user_data);
+
+/* exported from this file */
+struct inode_operations coda_ioctl_inode_operations =
+{
+	.permission	= coda_ioctl_permission,
+	.setattr	= coda_setattr,
+};
+
+struct file_operations coda_ioctl_operations = {
+	.owner		= THIS_MODULE,
+	.ioctl		= coda_pioctl,
+};
+
+/* the coda pioctl inode ops */
+static int coda_ioctl_permission(struct inode *inode, int mask,
+				 struct nameidata *nd)
+{
+        return 0;
+}
+
+static int coda_pioctl(struct inode * inode, struct file * filp, 
+                       unsigned int cmd, unsigned long user_data)
+{
+	struct nameidata nd;
+        int error;
+	struct PioctlData data;
+        struct inode *target_inode = NULL;
+        struct coda_inode_info *cnp;
+
+        /* get the Pioctl data arguments from user space */
+        if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) {
+	    return -EINVAL;
+	}
+       
+        /* 
+         * Look up the pathname. Note that the pathname is in 
+         * user memory, and namei takes care of this
+         */
+        if ( data.follow ) {
+                error = user_path_walk(data.path, &nd);
+	} else {
+	        error = user_path_walk_link(data.path, &nd);
+	}
+		
+	if ( error ) {
+		return error;
+        } else {
+	        target_inode = nd.dentry->d_inode;
+	}
+	
+	/* return if it is not a Coda inode */
+	if ( target_inode->i_sb != inode->i_sb ) {
+		path_release(&nd);
+	        return  -EINVAL;
+	}
+
+	/* now proceed to make the upcall */
+        cnp = ITOC(target_inode);
+
+	error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
+
+	path_release(&nd);
+        return error;
+}
+

fs/coda/psdev.c

@@ -0,0 +1,462 @@
+/*
+ *      	An implementation of a loadable kernel mode driver providing
+ *		multiple kernel/user space bidirectional communications links.
+ *
+ * 		Author: 	Alan Cox <alan@redhat.com>
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ * 
+ *              Adapted to become the Linux 2.0 Coda pseudo device
+ *              Peter  Braam  <braam@maths.ox.ac.uk> 
+ *              Michael Callahan <mjc@emmy.smith.edu>           
+ *
+ *              Changes for Linux 2.1
+ *              Copyright (c) 1997 Carnegie-Mellon University
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/time.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/smp_lock.h>
+#include <linux/device.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/poll.h>
+#include <asm/uaccess.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_proc.h>
+
+#define upc_free(r) kfree(r)
+
+/* 
+ * Coda stuff
+ */
+extern struct file_system_type coda_fs_type;
+
+/* statistics */
+int           coda_hard;         /* allows signals during upcalls */
+unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */
+
+
+struct venus_comm coda_comms[MAX_CODADEVS];
+static struct class_simple *coda_psdev_class;
+
+/*
+ * Device operations
+ */
+
+static unsigned int coda_psdev_poll(struct file *file, poll_table * wait)
+{
+        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
+	unsigned int mask = POLLOUT | POLLWRNORM;
+
+	poll_wait(file, &vcp->vc_waitq, wait);
+	if (!list_empty(&vcp->vc_pending))
+                mask |= POLLIN | POLLRDNORM;
+
+	return mask;
+}
+
+static int coda_psdev_ioctl(struct inode * inode, struct file * filp, 
+			    unsigned int cmd, unsigned long arg)
+{
+	unsigned int data;
+
+	switch(cmd) {
+	case CIOC_KERNEL_VERSION:
+		data = CODA_KERNEL_VERSION;
+		return put_user(data, (int __user *) arg);
+	default:
+		return -ENOTTY;
+	}
+
+	return 0;
+}
+
+/*
+ *	Receive a message written by Venus to the psdev
+ */
+ 
+static ssize_t coda_psdev_write(struct file *file, const char __user *buf, 
+				size_t nbytes, loff_t *off)
+{
+        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
+        struct upc_req *req = NULL;
+        struct upc_req *tmp;
+	struct list_head *lh;
+	struct coda_in_hdr hdr;
+	ssize_t retval = 0, count = 0;
+	int error;
+
+        /* Peek at the opcode, uniquefier */
+	if (copy_from_user(&hdr, buf, 2 * sizeof(u_long)))
+	        return -EFAULT;
+
+        if (DOWNCALL(hdr.opcode)) {
+		struct super_block *sb = NULL;
+                union outputArgs *dcbuf;
+		int size = sizeof(*dcbuf);
+
+		sb = vcp->vc_sb;
+		if ( !sb ) {
+                        count = nbytes;
+                        goto out;
+		}
+
+		if  ( nbytes < sizeof(struct coda_out_hdr) ) {
+		        printk("coda_downcall opc %d uniq %d, not enough!\n",
+			       hdr.opcode, hdr.unique);
+			count = nbytes;
+			goto out;
+		}
+		if ( nbytes > size ) {
+		        printk("Coda: downcall opc %d, uniq %d, too much!",
+			       hdr.opcode, hdr.unique);
+		        nbytes = size;
+		}
+		CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
+		if (copy_from_user(dcbuf, buf, nbytes)) {
+			CODA_FREE(dcbuf, nbytes);
+			retval = -EFAULT;
+			goto out;
+		}
+
+		/* what downcall errors does Venus handle ? */
+		lock_kernel();
+		error = coda_downcall(hdr.opcode, dcbuf, sb);
+		unlock_kernel();
+
+		CODA_FREE(dcbuf, nbytes);
+		if (error) {
+		        printk("psdev_write: coda_downcall error: %d\n", error);
+			retval = error;
+			goto out;
+		}
+		count = nbytes;
+		goto out;
+	}
+        
+	/* Look for the message on the processing queue. */
+	lock_kernel();
+	list_for_each(lh, &vcp->vc_processing) {
+		tmp = list_entry(lh, struct upc_req , uc_chain);
+		if (tmp->uc_unique == hdr.unique) {
+			req = tmp;
+			list_del(&req->uc_chain);
+			break;
+		}
+	}
+	unlock_kernel();
+
+	if (!req) {
+		printk("psdev_write: msg (%d, %d) not found\n", 
+			hdr.opcode, hdr.unique);
+		retval = -ESRCH;
+		goto out;
+	}
+
+        /* move data into response buffer. */
+	if (req->uc_outSize < nbytes) {
+                printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
+		       req->uc_outSize, (long)nbytes, hdr.opcode, hdr.unique);
+		nbytes = req->uc_outSize; /* don't have more space! */
+	}
+        if (copy_from_user(req->uc_data, buf, nbytes)) {
+		req->uc_flags |= REQ_ABORT;
+		wake_up(&req->uc_sleep);
+		retval = -EFAULT;
+		goto out;
+	}
+
+	/* adjust outsize. is this useful ?? */
+        req->uc_outSize = nbytes;	
+        req->uc_flags |= REQ_WRITE;
+	count = nbytes;
+
+	/* Convert filedescriptor into a file handle */
+	if (req->uc_opcode == CODA_OPEN_BY_FD) {
+		struct coda_open_by_fd_out *outp =
+			(struct coda_open_by_fd_out *)req->uc_data;
+		outp->fh = fget(outp->fd);
+	}
+
+        wake_up(&req->uc_sleep);
+out:
+        return(count ? count : retval);  
+}
+
+/*
+ *	Read a message from the kernel to Venus
+ */
+
+static ssize_t coda_psdev_read(struct file * file, char __user * buf, 
+			       size_t nbytes, loff_t *off)
+{
+	DECLARE_WAITQUEUE(wait, current);
+        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
+        struct upc_req *req;
+	ssize_t retval = 0, count = 0;
+
+	if (nbytes == 0)
+		return 0;
+
+	lock_kernel();
+
+	add_wait_queue(&vcp->vc_waitq, &wait);
+	set_current_state(TASK_INTERRUPTIBLE);
+
+	while (list_empty(&vcp->vc_pending)) {
+		if (file->f_flags & O_NONBLOCK) {
+			retval = -EAGAIN;
+			break;
+		}
+		if (signal_pending(current)) {
+			retval = -ERESTARTSYS;
+			break;
+		}
+		schedule();
+	}
+
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(&vcp->vc_waitq, &wait);
+
+	if (retval)
+		goto out;
+
+	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
+	list_del(&req->uc_chain);
+
+	/* Move the input args into userspace */
+	count = req->uc_inSize;
+	if (nbytes < req->uc_inSize) {
+                printk ("psdev_read: Venus read %ld bytes of %d in message\n",
+			(long)nbytes, req->uc_inSize);
+		count = nbytes;
+        }
+
+	if (copy_to_user(buf, req->uc_data, count))
+	        retval = -EFAULT;
+        
+	/* If request was not a signal, enqueue and don't free */
+	if (!(req->uc_flags & REQ_ASYNC)) {
+		req->uc_flags |= REQ_READ;
+		list_add(&(req->uc_chain), vcp->vc_processing.prev);
+		goto out;
+	}
+
+	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
+	upc_free(req);
+out:
+	unlock_kernel();
+	return (count ? count : retval);
+}
+
+static int coda_psdev_open(struct inode * inode, struct file * file)
+{
+        struct venus_comm *vcp;
+	int idx;
+
+	lock_kernel();
+	idx = iminor(inode);
+	if(idx >= MAX_CODADEVS) {
+		unlock_kernel();
+		return -ENODEV;
+	}
+
+	vcp = &coda_comms[idx];
+	if(vcp->vc_inuse) {
+		unlock_kernel();
+		return -EBUSY;
+	}
+	
+	if (!vcp->vc_inuse++) {
+		INIT_LIST_HEAD(&vcp->vc_pending);
+		INIT_LIST_HEAD(&vcp->vc_processing);
+		init_waitqueue_head(&vcp->vc_waitq);
+		vcp->vc_sb = NULL;
+		vcp->vc_seq = 0;
+	}
+	
+	file->private_data = vcp;
+
+	unlock_kernel();
+        return 0;
+}
+
+
+static int coda_psdev_release(struct inode * inode, struct file * file)
+{
+        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
+        struct upc_req *req, *tmp;
+
+	lock_kernel();
+	if ( !vcp->vc_inuse ) {
+		unlock_kernel();
+		printk("psdev_release: Not open.\n");
+		return -1;
+	}
+
+	if (--vcp->vc_inuse) {
+		unlock_kernel();
+		return 0;
+	}
+        
+        /* Wakeup clients so they can return. */
+	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
+		/* Async requests need to be freed here */
+		if (req->uc_flags & REQ_ASYNC) {
+			CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
+			upc_free(req);
+			continue;
+		}
+		req->uc_flags |= REQ_ABORT;
+		wake_up(&req->uc_sleep);
+        }
+        
+	list_for_each_entry(req, &vcp->vc_processing, uc_chain) {
+		req->uc_flags |= REQ_ABORT;
+	        wake_up(&req->uc_sleep);
+        }
+
+	unlock_kernel();
+	return 0;
+}
+
+
+static struct file_operations coda_psdev_fops = {
+	.owner		= THIS_MODULE,
+	.read		= coda_psdev_read,
+	.write		= coda_psdev_write,
+	.poll		= coda_psdev_poll,
+	.ioctl		= coda_psdev_ioctl,
+	.open		= coda_psdev_open,
+	.release	= coda_psdev_release,
+};
+
+static int init_coda_psdev(void)
+{
+	int i, err = 0;
+	if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
+              printk(KERN_ERR "coda_psdev: unable to get major %d\n", 
+		     CODA_PSDEV_MAJOR);
+              return -EIO;
+	}
+	coda_psdev_class = class_simple_create(THIS_MODULE, "coda");
+	if (IS_ERR(coda_psdev_class)) {
+		err = PTR_ERR(coda_psdev_class);
+		goto out_chrdev;
+	}		
+	devfs_mk_dir ("coda");
+	for (i = 0; i < MAX_CODADEVS; i++) {
+		class_simple_device_add(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR,i), 
+				NULL, "cfs%d", i);
+		err = devfs_mk_cdev(MKDEV(CODA_PSDEV_MAJOR, i),
+				S_IFCHR|S_IRUSR|S_IWUSR, "coda/%d", i);
+		if (err)
+			goto out_class;
+	}
+	coda_sysctl_init();
+	goto out;
+
+out_class:
+	for (i = 0; i < MAX_CODADEVS; i++) 
+		class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
+	class_simple_destroy(coda_psdev_class);
+out_chrdev:
+	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
+out:
+	return err;
+}
+
+
+MODULE_AUTHOR("Peter J. Braam <braam@cs.cmu.edu>");
+MODULE_LICENSE("GPL");
+
+extern int coda_init_inodecache(void);
+extern void coda_destroy_inodecache(void);
+static int __init init_coda(void)
+{
+	int status;
+	int i;
+	printk(KERN_INFO "Coda Kernel/Venus communications, "
+#ifdef CONFIG_CODA_FS_OLD_API
+	       "v5.3.20"
+#else
+	       "v6.0.0"
+#endif
+	       ", coda@cs.cmu.edu\n");
+
+	status = coda_init_inodecache();
+	if (status)
+		goto out2;
+	status = init_coda_psdev();
+	if ( status ) {
+		printk("Problem (%d) in init_coda_psdev\n", status);
+		goto out1;
+	}
+	
+	status = register_filesystem(&coda_fs_type);
+	if (status) {
+		printk("coda: failed to register filesystem!\n");
+		goto out;
+	}
+	return 0;
+out:
+	for (i = 0; i < MAX_CODADEVS; i++) {
+		class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
+		devfs_remove("coda/%d", i);
+	}
+	class_simple_destroy(coda_psdev_class);
+	devfs_remove("coda");
+	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
+	coda_sysctl_clean();
+out1:
+	coda_destroy_inodecache();
+out2:
+	return status;
+}
+
+static void __exit exit_coda(void)
+{
+        int err, i;
+
+	err = unregister_filesystem(&coda_fs_type);
+        if ( err != 0 ) {
+                printk("coda: failed to unregister filesystem\n");
+        }
+	for (i = 0; i < MAX_CODADEVS; i++) {
+		class_simple_device_remove(MKDEV(CODA_PSDEV_MAJOR, i));
+		devfs_remove("coda/%d", i);
+	}
+	class_simple_destroy(coda_psdev_class);
+	devfs_remove("coda");
+	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
+	coda_sysctl_clean();
+	coda_destroy_inodecache();
+}
+
+module_init(init_coda);
+module_exit(exit_coda);
+

fs/coda/symlink.c

@@ -0,0 +1,55 @@
+/*
+ * Symlink inode operations for Coda filesystem
+ * Original version: (C) 1996 P. Braam and M. Callahan
+ * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
+ * 
+ * Carnegie Mellon encourages users to contribute improvements to
+ * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/pagemap.h>
+#include <linux/smp_lock.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_proc.h>
+
+static int coda_symlink_filler(struct file *file, struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	int error;
+	struct coda_inode_info *cii;
+	unsigned int len = PAGE_SIZE;
+	char *p = kmap(page);
+
+	lock_kernel();
+	cii = ITOC(inode);
+	coda_vfs_stat.follow_link++;
+
+	error = venus_readlink(inode->i_sb, &cii->c_fid, p, &len);
+	unlock_kernel();
+	if (error)
+		goto fail;
+	SetPageUptodate(page);
+	kunmap(page);
+	unlock_page(page);
+	return 0;
+
+fail:
+	SetPageError(page);
+	kunmap(page);
+	unlock_page(page);
+	return error;
+}
+
+struct address_space_operations coda_symlink_aops = {
+	.readpage	= coda_symlink_filler,
+};

fs/coda/sysctl.c

@@ -0,0 +1,254 @@
+/*
+ * Sysctl operations for Coda filesystem
+ * Original version: (C) 1996 P. Braam and M. Callahan
+ * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
+ * 
+ * Carnegie Mellon encourages users to contribute improvements to
+ * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
+ * 
+ * CODA operation statistics
+ * (c) March, 1998 Zhanyong Wan <zhanyong.wan@yale.edu>
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/time.h>
+#include <linux/mm.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/ctype.h>
+#include <linux/bitops.h>
+#include <asm/uaccess.h>
+#include <linux/utsname.h>
+#include <linux/module.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_cache.h>
+#include <linux/coda_proc.h>
+
+static struct ctl_table_header *fs_table_header;
+
+#define FS_CODA         1       /* Coda file system */
+
+#define CODA_TIMEOUT    3       /* timeout on upcalls to become intrble */
+#define CODA_HARD       5       /* mount type "hard" or "soft" */
+#define CODA_VFS 	 6       /* vfs statistics */
+#define CODA_CACHE_INV 	 9       /* cache invalidation statistics */
+#define CODA_FAKE_STATFS 10	 /* don't query venus for actual cache usage */
+
+struct coda_vfs_stats		coda_vfs_stat;
+static struct coda_cache_inv_stats	coda_cache_inv_stat;
+
+static void reset_coda_vfs_stats( void )
+{
+	memset( &coda_vfs_stat, 0, sizeof( coda_vfs_stat ) );
+}
+
+static void reset_coda_cache_inv_stats( void )
+{
+	memset( &coda_cache_inv_stat, 0, sizeof( coda_cache_inv_stat ) );
+}
+
+static int do_reset_coda_vfs_stats( ctl_table * table, int write,
+				    struct file * filp, void __user * buffer,
+				    size_t * lenp, loff_t * ppos )
+{
+	if ( write ) {
+		reset_coda_vfs_stats();
+
+		*ppos += *lenp;
+	} else {
+		*lenp = 0;
+	}
+
+	return 0;
+}
+
+static int do_reset_coda_cache_inv_stats( ctl_table * table, int write,
+					  struct file * filp,
+					  void __user * buffer,
+					  size_t * lenp, loff_t * ppos )
+{
+	if ( write ) {
+		reset_coda_cache_inv_stats();
+
+		*ppos += *lenp;
+	} else {
+		*lenp = 0;
+	}
+  
+	return 0;
+}
+
+static int coda_vfs_stats_get_info( char * buffer, char ** start,
+				    off_t offset, int length)
+{
+	int len=0;
+	off_t begin;
+	struct coda_vfs_stats * ps = & coda_vfs_stat;
+  
+  /* this works as long as we are below 1024 characters! */
+	len += sprintf( buffer,
+			"Coda VFS statistics\n"
+			"===================\n\n"
+			"File Operations:\n"
+			"\topen\t\t%9d\n"
+			"\tflush\t\t%9d\n"
+			"\trelease\t\t%9d\n"
+			"\tfsync\t\t%9d\n\n"
+			"Dir Operations:\n"
+			"\treaddir\t\t%9d\n\n"
+			"Inode Operations\n"
+			"\tcreate\t\t%9d\n"
+			"\tlookup\t\t%9d\n"
+			"\tlink\t\t%9d\n"
+			"\tunlink\t\t%9d\n"
+			"\tsymlink\t\t%9d\n"
+			"\tmkdir\t\t%9d\n"
+			"\trmdir\t\t%9d\n"
+			"\trename\t\t%9d\n"
+			"\tpermission\t%9d\n",
+
+			/* file operations */
+			ps->open,
+			ps->flush,
+			ps->release,
+			ps->fsync,
+
+			/* dir operations */
+			ps->readdir,
+		  
+			/* inode operations */
+			ps->create,
+			ps->lookup,
+			ps->link,
+			ps->unlink,
+			ps->symlink,
+			ps->mkdir,
+			ps->rmdir,
+			ps->rename,
+			ps->permission); 
+
+	begin = offset;
+	*start = buffer + begin;
+	len -= begin;
+
+	if ( len > length )
+		len = length;
+	if ( len < 0 )
+		len = 0;
+
+	return len;
+}
+
+static int coda_cache_inv_stats_get_info( char * buffer, char ** start,
+					  off_t offset, int length)
+{
+	int len=0;
+	off_t begin;
+	struct coda_cache_inv_stats * ps = & coda_cache_inv_stat;
+  
+	/* this works as long as we are below 1024 characters! */
+	len += sprintf( buffer,
+			"Coda cache invalidation statistics\n"
+			"==================================\n\n"
+			"flush\t\t%9d\n"
+			"purge user\t%9d\n"
+			"zap_dir\t\t%9d\n"
+			"zap_file\t%9d\n"
+			"zap_vnode\t%9d\n"
+			"purge_fid\t%9d\n"
+			"replace\t\t%9d\n",
+			ps->flush,
+			ps->purge_user,
+			ps->zap_dir,
+			ps->zap_file,
+			ps->zap_vnode,
+			ps->purge_fid,
+			ps->replace );
+  
+	begin = offset;
+	*start = buffer + begin;
+	len -= begin;
+
+	if ( len > length )
+		len = length;
+	if ( len < 0 )
+		len = 0;
+
+	return len;
+}
+
+static ctl_table coda_table[] = {
+ 	{CODA_TIMEOUT, "timeout", &coda_timeout, sizeof(int), 0644, NULL, &proc_dointvec},
+ 	{CODA_HARD, "hard", &coda_hard, sizeof(int), 0644, NULL, &proc_dointvec},
+ 	{CODA_VFS, "vfs_stats", NULL, 0, 0644, NULL, &do_reset_coda_vfs_stats},
+ 	{CODA_CACHE_INV, "cache_inv_stats", NULL, 0, 0644, NULL, &do_reset_coda_cache_inv_stats},
+ 	{CODA_FAKE_STATFS, "fake_statfs", &coda_fake_statfs, sizeof(int), 0600, NULL, &proc_dointvec},
+	{ 0 }
+};
+
+static ctl_table fs_table[] = {
+       {FS_CODA, "coda",    NULL, 0, 0555, coda_table},
+       {0}
+};
+
+
+#ifdef CONFIG_PROC_FS
+
+/*
+ target directory structure:
+   /proc/fs  (see linux/fs/proc/root.c)
+   /proc/fs/coda
+   /proc/fs/coda/{vfs_stats,
+
+*/
+
+static struct proc_dir_entry* proc_fs_coda;
+
+#endif
+
+#define coda_proc_create(name,get_info) \
+	create_proc_info_entry(name, 0, proc_fs_coda, get_info)
+
+void coda_sysctl_init(void)
+{
+	reset_coda_vfs_stats();
+	reset_coda_cache_inv_stats();
+
+#ifdef CONFIG_PROC_FS
+	proc_fs_coda = proc_mkdir("coda", proc_root_fs);
+	if (proc_fs_coda) {
+		proc_fs_coda->owner = THIS_MODULE;
+		coda_proc_create("vfs_stats", coda_vfs_stats_get_info);
+		coda_proc_create("cache_inv_stats", coda_cache_inv_stats_get_info);
+	}
+#endif
+
+#ifdef CONFIG_SYSCTL
+	if ( !fs_table_header )
+		fs_table_header = register_sysctl_table(fs_table, 0);
+#endif 
+}
+
+void coda_sysctl_clean(void) 
+{
+
+#ifdef CONFIG_SYSCTL
+	if ( fs_table_header ) {
+		unregister_sysctl_table(fs_table_header);
+		fs_table_header = NULL;
+	}
+#endif
+
+#ifdef CONFIG_PROC_FS
+        remove_proc_entry("cache_inv_stats", proc_fs_coda);
+        remove_proc_entry("vfs_stats", proc_fs_coda);
+	remove_proc_entry("coda", proc_root_fs);
+#endif 
+}

fs/coda/upcall.c

@@ -0,0 +1,914 @@
+/*
+ * Mostly platform independent upcall operations to Venus:
+ *  -- upcalls
+ *  -- upcall routines
+ *
+ * Linux 2.0 version
+ * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk>, 
+ * Michael Callahan <callahan@maths.ox.ac.uk> 
+ * 
+ * Redone for Linux 2.1
+ * Copyright (C) 1997 Carnegie Mellon University
+ *
+ * Carnegie Mellon University encourages users of this code to contribute
+ * improvements to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
+ */
+
+#include <asm/system.h>
+#include <linux/signal.h>
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <asm/uaccess.h>
+#include <linux/vmalloc.h>
+#include <linux/vfs.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_cache.h>
+#include <linux/coda_proc.h> 
+
+#define upc_alloc() kmalloc(sizeof(struct upc_req), GFP_KERNEL)
+#define upc_free(r) kfree(r)
+
+static int coda_upcall(struct coda_sb_info *mntinfo, int inSize, int *outSize, 
+		       union inputArgs *buffer);
+
+static void *alloc_upcall(int opcode, int size)
+{
+	union inputArgs *inp;
+
+	CODA_ALLOC(inp, union inputArgs *, size);
+        if (!inp)
+		return ERR_PTR(-ENOMEM);
+
+        inp->ih.opcode = opcode;
+	inp->ih.pid = current->pid;
+	inp->ih.pgid = process_group(current);
+#ifdef CONFIG_CODA_FS_OLD_API
+	memset(&inp->ih.cred, 0, sizeof(struct coda_cred));
+	inp->ih.cred.cr_fsuid = current->fsuid;
+#else
+	inp->ih.uid = current->fsuid;
+#endif
+	return (void*)inp;
+}
+
+#define UPARG(op)\
+do {\
+	inp = (union inputArgs *)alloc_upcall(op, insize); \
+        if (IS_ERR(inp)) { return PTR_ERR(inp); }\
+        outp = (union outputArgs *)(inp); \
+        outsize = insize; \
+} while (0)
+
+#define INSIZE(tag) sizeof(struct coda_ ## tag ## _in)
+#define OUTSIZE(tag) sizeof(struct coda_ ## tag ## _out)
+#define SIZE(tag)  max_t(unsigned int, INSIZE(tag), OUTSIZE(tag))
+
+
+/* the upcalls */
+int venus_rootfid(struct super_block *sb, struct CodaFid *fidp)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+
+        insize = SIZE(root);
+        UPARG(CODA_ROOT);
+
+	error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+	
+	if (error) {
+	        printk("coda_get_rootfid: error %d\n", error);
+	} else {
+		*fidp = outp->coda_root.VFid;
+	}
+
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+int venus_getattr(struct super_block *sb, struct CodaFid *fid, 
+		     struct coda_vattr *attr) 
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+
+        insize = SIZE(getattr); 
+	UPARG(CODA_GETATTR);
+        inp->coda_getattr.VFid = *fid;
+
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+	
+	*attr = outp->coda_getattr.attr;
+
+	CODA_FREE(inp, insize);
+        return error;
+}
+
+int venus_setattr(struct super_block *sb, struct CodaFid *fid, 
+		  struct coda_vattr *vattr)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+	
+	insize = SIZE(setattr);
+	UPARG(CODA_SETATTR);
+
+        inp->coda_setattr.VFid = *fid;
+	inp->coda_setattr.attr = *vattr;
+
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+        CODA_FREE(inp, insize);
+        return error;
+}
+
+int venus_lookup(struct super_block *sb, struct CodaFid *fid, 
+		    const char *name, int length, int * type, 
+		    struct CodaFid *resfid)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+	int offset;
+
+	offset = INSIZE(lookup);
+        insize = max_t(unsigned int, offset + length +1, OUTSIZE(lookup));
+	UPARG(CODA_LOOKUP);
+
+        inp->coda_lookup.VFid = *fid;
+	inp->coda_lookup.name = offset;
+	inp->coda_lookup.flags = CLU_CASE_SENSITIVE;
+        /* send Venus a null terminated string */
+        memcpy((char *)(inp) + offset, name, length);
+        *((char *)inp + offset + length) = '\0';
+
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	*resfid = outp->coda_lookup.VFid;
+	*type = outp->coda_lookup.vtype;
+
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+int venus_store(struct super_block *sb, struct CodaFid *fid, int flags,
+                vuid_t uid)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+#ifdef CONFIG_CODA_FS_OLD_API
+	struct coda_cred cred = { 0, };
+	cred.cr_fsuid = uid;
+#endif
+	
+	insize = SIZE(store);
+	UPARG(CODA_STORE);
+	
+#ifdef CONFIG_CODA_FS_OLD_API
+	memcpy(&(inp->ih.cred), &cred, sizeof(cred));
+#else
+	inp->ih.uid = uid;
+#endif
+	
+        inp->coda_store.VFid = *fid;
+        inp->coda_store.flags = flags;
+
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+        return error;
+}
+
+int venus_release(struct super_block *sb, struct CodaFid *fid, int flags)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+	
+	insize = SIZE(release);
+	UPARG(CODA_RELEASE);
+	
+	inp->coda_release.VFid = *fid;
+	inp->coda_release.flags = flags;
+
+	error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
+                vuid_t uid)
+{
+	union inputArgs *inp;
+	union outputArgs *outp;
+	int insize, outsize, error;
+#ifdef CONFIG_CODA_FS_OLD_API
+	struct coda_cred cred = { 0, };
+	cred.cr_fsuid = uid;
+#endif
+	
+	insize = SIZE(release);
+	UPARG(CODA_CLOSE);
+	
+#ifdef CONFIG_CODA_FS_OLD_API
+	memcpy(&(inp->ih.cred), &cred, sizeof(cred));
+#else
+	inp->ih.uid = uid;
+#endif
+	
+        inp->coda_close.VFid = *fid;
+        inp->coda_close.flags = flags;
+
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+        return error;
+}
+
+int venus_open(struct super_block *sb, struct CodaFid *fid,
+		  int flags, struct file **fh)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+       
+	insize = SIZE(open_by_fd);
+	UPARG(CODA_OPEN_BY_FD);
+
+        inp->coda_open.VFid = *fid;
+        inp->coda_open.flags = flags;
+
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	*fh = outp->coda_open_by_fd.fh;
+
+	CODA_FREE(inp, insize);
+	return error;
+}	
+
+int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid, 
+		   const char *name, int length, 
+		   struct CodaFid *newfid, struct coda_vattr *attrs)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+        int offset;
+
+	offset = INSIZE(mkdir);
+	insize = max_t(unsigned int, offset + length + 1, OUTSIZE(mkdir));
+	UPARG(CODA_MKDIR);
+
+        inp->coda_mkdir.VFid = *dirfid;
+        inp->coda_mkdir.attr = *attrs;
+	inp->coda_mkdir.name = offset;
+        /* Venus must get null terminated string */
+        memcpy((char *)(inp) + offset, name, length);
+        *((char *)inp + offset + length) = '\0';
+        
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	*attrs = outp->coda_mkdir.attr;
+	*newfid = outp->coda_mkdir.VFid;
+
+	CODA_FREE(inp, insize);
+	return error;        
+}
+
+
+int venus_rename(struct super_block *sb, struct CodaFid *old_fid, 
+		 struct CodaFid *new_fid, size_t old_length, 
+		 size_t new_length, const char *old_name, 
+		 const char *new_name)
+{
+	union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error; 
+	int offset, s;
+	
+	offset = INSIZE(rename);
+	insize = max_t(unsigned int, offset + new_length + old_length + 8,
+		     OUTSIZE(rename)); 
+ 	UPARG(CODA_RENAME);
+
+        inp->coda_rename.sourceFid = *old_fid;
+        inp->coda_rename.destFid =  *new_fid;
+        inp->coda_rename.srcname = offset;
+
+        /* Venus must receive an null terminated string */
+        s = ( old_length & ~0x3) +4; /* round up to word boundary */
+        memcpy((char *)(inp) + offset, old_name, old_length);
+        *((char *)inp + offset + old_length) = '\0';
+
+        /* another null terminated string for Venus */
+        offset += s;
+        inp->coda_rename.destname = offset;
+        s = ( new_length & ~0x3) +4; /* round up to word boundary */
+        memcpy((char *)(inp) + offset, new_name, new_length);
+        *((char *)inp + offset + new_length) = '\0';
+
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+int venus_create(struct super_block *sb, struct CodaFid *dirfid, 
+		 const char *name, int length, int excl, int mode,
+		 struct CodaFid *newfid, struct coda_vattr *attrs) 
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+        int offset;
+
+        offset = INSIZE(create);
+	insize = max_t(unsigned int, offset + length + 1, OUTSIZE(create));
+	UPARG(CODA_CREATE);
+
+        inp->coda_create.VFid = *dirfid;
+        inp->coda_create.attr.va_mode = mode;
+	inp->coda_create.excl = excl;
+        inp->coda_create.mode = mode;
+        inp->coda_create.name = offset;
+
+        /* Venus must get null terminated string */
+        memcpy((char *)(inp) + offset, name, length);
+        *((char *)inp + offset + length) = '\0';
+                
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	*attrs = outp->coda_create.attr;
+	*newfid = outp->coda_create.VFid;
+
+	CODA_FREE(inp, insize);
+	return error;        
+}
+
+int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid, 
+		    const char *name, int length)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+        int offset;
+
+        offset = INSIZE(rmdir);
+	insize = max_t(unsigned int, offset + length + 1, OUTSIZE(rmdir));
+	UPARG(CODA_RMDIR);
+
+        inp->coda_rmdir.VFid = *dirfid;
+        inp->coda_rmdir.name = offset;
+        memcpy((char *)(inp) + offset, name, length);
+	*((char *)inp + offset + length) = '\0';
+        
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+int venus_remove(struct super_block *sb, struct CodaFid *dirfid, 
+		    const char *name, int length)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int error=0, insize, outsize, offset;
+
+        offset = INSIZE(remove);
+	insize = max_t(unsigned int, offset + length + 1, OUTSIZE(remove));
+	UPARG(CODA_REMOVE);
+
+        inp->coda_remove.VFid = *dirfid;
+        inp->coda_remove.name = offset;
+        memcpy((char *)(inp) + offset, name, length);
+	*((char *)inp + offset + length) = '\0';
+        
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+int venus_readlink(struct super_block *sb, struct CodaFid *fid, 
+		      char *buffer, int *length)
+{ 
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+        int retlen;
+        char *result;
+        
+	insize = max_t(unsigned int,
+		     INSIZE(readlink), OUTSIZE(readlink)+ *length + 1);
+	UPARG(CODA_READLINK);
+
+        inp->coda_readlink.VFid = *fid;
+    
+        error =  coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+	
+	if (! error) {
+                retlen = outp->coda_readlink.count;
+		if ( retlen > *length )
+		        retlen = *length;
+		*length = retlen;
+		result =  (char *)outp + (long)outp->coda_readlink.data;
+		memcpy(buffer, result, retlen);
+		*(buffer + retlen) = '\0';
+	}
+        
+        CODA_FREE(inp, insize);
+        return error;
+}
+
+
+
+int venus_link(struct super_block *sb, struct CodaFid *fid, 
+		  struct CodaFid *dirfid, const char *name, int len )
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+        int offset;
+
+	offset = INSIZE(link);
+	insize = max_t(unsigned int, offset  + len + 1, OUTSIZE(link));
+        UPARG(CODA_LINK);
+
+        inp->coda_link.sourceFid = *fid;
+        inp->coda_link.destFid = *dirfid;
+        inp->coda_link.tname = offset;
+
+        /* make sure strings are null terminated */
+        memcpy((char *)(inp) + offset, name, len);
+        *((char *)inp + offset + len) = '\0';
+        
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+        return error;
+}
+
+int venus_symlink(struct super_block *sb, struct CodaFid *fid,
+		     const char *name, int len,
+		     const char *symname, int symlen)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+        int offset, s;
+
+        offset = INSIZE(symlink);
+	insize = max_t(unsigned int, offset + len + symlen + 8, OUTSIZE(symlink));
+	UPARG(CODA_SYMLINK);
+        
+        /*        inp->coda_symlink.attr = *tva; XXXXXX */ 
+        inp->coda_symlink.VFid = *fid;
+
+	/* Round up to word boundary and null terminate */
+        inp->coda_symlink.srcname = offset;
+        s = ( symlen  & ~0x3 ) + 4; 
+        memcpy((char *)(inp) + offset, symname, symlen);
+        *((char *)inp + offset + symlen) = '\0';
+        
+	/* Round up to word boundary and null terminate */
+        offset += s;
+        inp->coda_symlink.tname = offset;
+        s = (len & ~0x3) + 4;
+        memcpy((char *)(inp) + offset, name, len);
+        *((char *)inp + offset + len) = '\0';
+
+	error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+        return error;
+}
+
+int venus_fsync(struct super_block *sb, struct CodaFid *fid)
+{
+        union inputArgs *inp;
+        union outputArgs *outp; 
+	int insize, outsize, error;
+	
+	insize=SIZE(fsync);
+	UPARG(CODA_FSYNC);
+
+        inp->coda_fsync.VFid = *fid;
+        error = coda_upcall(coda_sbp(sb), sizeof(union inputArgs), 
+                            &outsize, inp);
+
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+int venus_access(struct super_block *sb, struct CodaFid *fid, int mask)
+{
+        union inputArgs *inp;
+        union outputArgs *outp; 
+	int insize, outsize, error;
+
+	insize = SIZE(access);
+	UPARG(CODA_ACCESS);
+
+        inp->coda_access.VFid = *fid;
+        inp->coda_access.flags = mask;
+
+	error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+
+int venus_pioctl(struct super_block *sb, struct CodaFid *fid,
+		 unsigned int cmd, struct PioctlData *data)
+{
+        union inputArgs *inp;
+        union outputArgs *outp;  
+	int insize, outsize, error;
+	int iocsize;
+
+	insize = VC_MAXMSGSIZE;
+	UPARG(CODA_IOCTL);
+
+        /* build packet for Venus */
+        if (data->vi.in_size > VC_MAXDATASIZE) {
+		error = -EINVAL;
+		goto exit;
+        }
+
+        if (data->vi.out_size > VC_MAXDATASIZE) {
+		error = -EINVAL;
+		goto exit;
+	}
+
+        inp->coda_ioctl.VFid = *fid;
+    
+        /* the cmd field was mutated by increasing its size field to
+         * reflect the path and follow args. We need to subtract that
+         * out before sending the command to Venus.  */
+        inp->coda_ioctl.cmd = (cmd & ~(PIOCPARM_MASK << 16));	
+        iocsize = ((cmd >> 16) & PIOCPARM_MASK) - sizeof(char *) - sizeof(int);
+        inp->coda_ioctl.cmd |= (iocsize & PIOCPARM_MASK) <<	16;	
+    
+        /* in->coda_ioctl.rwflag = flag; */
+        inp->coda_ioctl.len = data->vi.in_size;
+        inp->coda_ioctl.data = (char *)(INSIZE(ioctl));
+     
+        /* get the data out of user space */
+        if ( copy_from_user((char*)inp + (long)inp->coda_ioctl.data,
+			    data->vi.in, data->vi.in_size) ) {
+		error = -EINVAL;
+	        goto exit;
+	}
+
+        error = coda_upcall(coda_sbp(sb), SIZE(ioctl) + data->vi.in_size,
+                            &outsize, inp);
+        
+        if (error) {
+	        printk("coda_pioctl: Venus returns: %d for %s\n", 
+		       error, coda_f2s(fid));
+		goto exit; 
+	}
+
+	if (outsize < (long)outp->coda_ioctl.data + outp->coda_ioctl.len) {
+		error = -EINVAL;
+		goto exit;
+	}
+        
+	/* Copy out the OUT buffer. */
+        if (outp->coda_ioctl.len > data->vi.out_size) {
+		error = -EINVAL;
+		goto exit;
+        }
+
+	/* Copy out the OUT buffer. */
+	if (copy_to_user(data->vi.out,
+			 (char *)outp + (long)outp->coda_ioctl.data,
+			 outp->coda_ioctl.len)) {
+		error = -EFAULT;
+		goto exit;
+	}
+
+ exit:
+	CODA_FREE(inp, insize);
+	return error;
+}
+
+int venus_statfs(struct super_block *sb, struct kstatfs *sfs) 
+{ 
+        union inputArgs *inp;
+        union outputArgs *outp;
+        int insize, outsize, error;
+        
+	insize = max_t(unsigned int, INSIZE(statfs), OUTSIZE(statfs));
+	UPARG(CODA_STATFS);
+
+        error = coda_upcall(coda_sbp(sb), insize, &outsize, inp);
+	
+        if (!error) {
+		sfs->f_blocks = outp->coda_statfs.stat.f_blocks;
+		sfs->f_bfree  = outp->coda_statfs.stat.f_bfree;
+		sfs->f_bavail = outp->coda_statfs.stat.f_bavail;
+		sfs->f_files  = outp->coda_statfs.stat.f_files;
+		sfs->f_ffree  = outp->coda_statfs.stat.f_ffree;
+	} else {
+		printk("coda_statfs: Venus returns: %d\n", error);
+	}
+
+        CODA_FREE(inp, insize);
+        return error;
+}
+
+/*
+ * coda_upcall and coda_downcall routines.
+ * 
+ */
+
+static inline void coda_waitfor_upcall(struct upc_req *vmp,
+				       struct venus_comm *vcommp)
+{
+	DECLARE_WAITQUEUE(wait, current);
+
+	vmp->uc_posttime = jiffies;
+
+	add_wait_queue(&vmp->uc_sleep, &wait);
+	for (;;) {
+		if ( !coda_hard && vmp->uc_opcode != CODA_CLOSE ) 
+			set_current_state(TASK_INTERRUPTIBLE);
+		else
+			set_current_state(TASK_UNINTERRUPTIBLE);
+
+                /* venus died */
+                if ( !vcommp->vc_inuse )
+                        break;
+
+		/* got a reply */
+		if ( vmp->uc_flags & ( REQ_WRITE | REQ_ABORT ) )
+			break;
+
+		if ( !coda_hard && vmp->uc_opcode != CODA_CLOSE && signal_pending(current) ) {
+			/* if this process really wants to die, let it go */
+			if ( sigismember(&(current->pending.signal), SIGKILL) ||
+			     sigismember(&(current->pending.signal), SIGINT) )
+				break;
+			/* signal is present: after timeout always return 
+			   really smart idea, probably useless ... */
+			if ( jiffies - vmp->uc_posttime > coda_timeout * HZ )
+				break; 
+		}
+		schedule();
+	}
+	remove_wait_queue(&vmp->uc_sleep, &wait);
+	set_current_state(TASK_RUNNING);
+
+	return;
+}
+
+
+/* 
+ * coda_upcall will return an error in the case of 
+ * failed communication with Venus _or_ will peek at Venus
+ * reply and return Venus' error.
+ *
+ * As venus has 2 types of errors, normal errors (positive) and internal
+ * errors (negative), normal errors are negated, while internal errors
+ * are all mapped to -EINTR, while showing a nice warning message. (jh)
+ * 
+ */
+static int coda_upcall(struct coda_sb_info *sbi, 
+		int inSize, int *outSize, 
+		union inputArgs *buffer) 
+{
+	struct venus_comm *vcommp;
+	union outputArgs *out;
+	struct upc_req *req;
+	int error = 0;
+
+	vcommp = sbi->sbi_vcomm;
+	if ( !vcommp->vc_inuse ) {
+		printk("No pseudo device in upcall comms at %p\n", vcommp);
+                return -ENXIO;
+	}
+
+	/* Format the request message. */
+	req = upc_alloc();
+	if (!req) {
+		printk("Failed to allocate upc_req structure\n");
+		return -ENOMEM;
+	}
+	req->uc_data = (void *)buffer;
+	req->uc_flags = 0;
+	req->uc_inSize = inSize;
+	req->uc_outSize = *outSize ? *outSize : inSize;
+	req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode;
+	req->uc_unique = ++vcommp->vc_seq;
+	init_waitqueue_head(&req->uc_sleep);
+	
+	/* Fill in the common input args. */
+	((union inputArgs *)buffer)->ih.unique = req->uc_unique;
+
+	/* Append msg to pending queue and poke Venus. */
+	list_add(&(req->uc_chain), vcommp->vc_pending.prev);
+        
+	wake_up_interruptible(&vcommp->vc_waitq);
+	/* We can be interrupted while we wait for Venus to process
+	 * our request.  If the interrupt occurs before Venus has read
+	 * the request, we dequeue and return. If it occurs after the
+	 * read but before the reply, we dequeue, send a signal
+	 * message, and return. If it occurs after the reply we ignore
+	 * it. In no case do we want to restart the syscall.  If it
+	 * was interrupted by a venus shutdown (psdev_close), return
+	 * ENODEV.  */
+
+	/* Go to sleep.  Wake up on signals only after the timeout. */
+	coda_waitfor_upcall(req, vcommp);
+
+	if (vcommp->vc_inuse) {      /* i.e. Venus is still alive */
+	    /* Op went through, interrupt or not... */
+	    if (req->uc_flags & REQ_WRITE) {
+		out = (union outputArgs *)req->uc_data;
+		/* here we map positive Venus errors to kernel errors */
+		error = -out->oh.result;
+		*outSize = req->uc_outSize;
+		goto exit;
+	    }
+	    if ( !(req->uc_flags & REQ_READ) && signal_pending(current)) { 
+		/* Interrupted before venus read it. */
+		list_del(&(req->uc_chain));
+		/* perhaps the best way to convince the app to
+		   give up? */
+		error = -EINTR;
+		goto exit;
+	    } 
+	    if ( (req->uc_flags & REQ_READ) && signal_pending(current) ) {
+		    /* interrupted after Venus did its read, send signal */
+		    union inputArgs *sig_inputArgs;
+		    struct upc_req *sig_req;
+		    
+		    list_del(&(req->uc_chain));
+		    error = -ENOMEM;
+		    sig_req = upc_alloc();
+		    if (!sig_req) goto exit;
+
+		    CODA_ALLOC((sig_req->uc_data), char *, sizeof(struct coda_in_hdr));
+		    if (!sig_req->uc_data) {
+			upc_free(sig_req);
+			goto exit;
+		    }
+		    
+		    error = -EINTR;
+		    sig_inputArgs = (union inputArgs *)sig_req->uc_data;
+		    sig_inputArgs->ih.opcode = CODA_SIGNAL;
+		    sig_inputArgs->ih.unique = req->uc_unique;
+		    
+		    sig_req->uc_flags = REQ_ASYNC;
+		    sig_req->uc_opcode = sig_inputArgs->ih.opcode;
+		    sig_req->uc_unique = sig_inputArgs->ih.unique;
+		    sig_req->uc_inSize = sizeof(struct coda_in_hdr);
+		    sig_req->uc_outSize = sizeof(struct coda_in_hdr);
+		    
+		    /* insert at head of queue! */
+		    list_add(&(sig_req->uc_chain), &vcommp->vc_pending);
+		    wake_up_interruptible(&vcommp->vc_waitq);
+	    } else {
+		    printk("Coda: Strange interruption..\n");
+		    error = -EINTR;
+	    }
+	} else {	/* If venus died i.e. !VC_OPEN(vcommp) */
+	        printk("coda_upcall: Venus dead on (op,un) (%d.%d) flags %d\n",
+		       req->uc_opcode, req->uc_unique, req->uc_flags);
+		error = -ENODEV;
+	}
+
+ exit:
+	upc_free(req);
+	return error;
+}
+
+/*  
+    The statements below are part of the Coda opportunistic
+    programming -- taken from the Mach/BSD kernel code for Coda. 
+    You don't get correct semantics by stating what needs to be
+    done without guaranteeing the invariants needed for it to happen.
+    When will be have time to find out what exactly is going on?  (pjb)
+*/
+
+
+/* 
+ * There are 7 cases where cache invalidations occur.  The semantics
+ *  of each is listed here:
+ *
+ * CODA_FLUSH     -- flush all entries from the name cache and the cnode cache.
+ * CODA_PURGEUSER -- flush all entries from the name cache for a specific user
+ *                  This call is a result of token expiration.
+ *
+ * The next arise as the result of callbacks on a file or directory.
+ * CODA_ZAPFILE   -- flush the cached attributes for a file.
+
+ * CODA_ZAPDIR    -- flush the attributes for the dir and
+ *                  force a new lookup for all the children
+                    of this dir.
+
+ *
+ * The next is a result of Venus detecting an inconsistent file.
+ * CODA_PURGEFID  -- flush the attribute for the file
+ *                  purge it and its children from the dcache
+ *
+ * The last  allows Venus to replace local fids with global ones
+ * during reintegration.
+ *
+ * CODA_REPLACE -- replace one CodaFid with another throughout the name cache */
+
+int coda_downcall(int opcode, union outputArgs * out, struct super_block *sb)
+{
+	/* Handle invalidation requests. */
+          if ( !sb || !sb->s_root || !sb->s_root->d_inode)
+		  return 0; 
+
+	  switch (opcode) {
+
+	  case CODA_FLUSH : {
+		   coda_cache_clear_all(sb);
+		   shrink_dcache_sb(sb);
+		   coda_flag_inode(sb->s_root->d_inode, C_FLUSH);
+		   return(0);
+	  }
+
+	  case CODA_PURGEUSER : {
+		   coda_cache_clear_all(sb);
+		   return(0);
+	  }
+
+	  case CODA_ZAPDIR : {
+	          struct inode *inode;
+		  struct CodaFid *fid = &out->coda_zapdir.CodaFid;
+
+		  inode = coda_fid_to_inode(fid, sb);
+		  if (inode) {
+			  coda_flag_inode_children(inode, C_PURGE);
+	                  coda_flag_inode(inode, C_VATTR);
+			  iput(inode);
+		  }
+		  
+		  return(0);
+	  }
+
+	  case CODA_ZAPFILE : {
+	          struct inode *inode;
+		  struct CodaFid *fid = &out->coda_zapfile.CodaFid;
+		  inode = coda_fid_to_inode(fid, sb);
+		  if ( inode ) {
+	                  coda_flag_inode(inode, C_VATTR);
+			  iput(inode);
+		  }
+		  return 0;
+	  }
+
+	  case CODA_PURGEFID : {
+	          struct inode *inode;
+		  struct CodaFid *fid = &out->coda_purgefid.CodaFid;
+		  inode = coda_fid_to_inode(fid, sb);
+		  if ( inode ) { 
+			coda_flag_inode_children(inode, C_PURGE);
+
+			/* catch the dentries later if some are still busy */
+			coda_flag_inode(inode, C_PURGE);
+			d_prune_aliases(inode);
+
+			iput(inode);
+		  }
+		  return 0;
+	  }
+
+	  case CODA_REPLACE : {
+	          struct inode *inode;
+		  struct CodaFid *oldfid = &out->coda_replace.OldFid;
+		  struct CodaFid *newfid = &out->coda_replace.NewFid;
+		  inode = coda_fid_to_inode(oldfid, sb);
+		  if ( inode ) { 
+			  coda_replace_fid(inode, oldfid, newfid);
+			  iput(inode);
+		  }
+		  return 0;
+	  }
+	  }
+	  return 0;
+}
+