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!

12 files changed, 3606 insertions, 0 deletions

diff --git a/fs/coda/Makefile b/fs/coda/Makefile
new file mode 100644
index 000000000000..6c22e61da397
--- /dev/null
+++ b/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
diff --git a/fs/coda/cache.c b/fs/coda/cache.c
new file mode 100644
index 000000000000..80072fd9b7fa
--- /dev/null
+++ b/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);
+}
+
diff --git a/fs/coda/cnode.c b/fs/coda/cnode.c
new file mode 100644
index 000000000000..23aeef5aa814
--- /dev/null
+++ b/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;
+}
+
diff --git a/fs/coda/coda_linux.c b/fs/coda/coda_linux.c
new file mode 100644
index 000000000000..5597080cb811
--- /dev/null
+++ b/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;
+	}
+}
+
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
new file mode 100644
index 000000000000..2391766e9c7c
--- /dev/null
+++ b/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-&g