[PATCH] v9fs: VFS inode operations

This part of the patch contains the VFS inode interfaces.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1371 insertions, 0 deletions

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
new file mode 100644
index 000000000000..ef78af7ef04b
--- /dev/null
+++ b/fs/9p/vfs_inode.c
@@ -0,0 +1,1371 @@
+/*
+ *  linux/fs/9p/vfs_inode.c
+ *
+ * This file contians vfs inode ops for the 9P2000 protocol.
+ *
+ *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/pagemap.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/namei.h>
+#include <linux/idr.h>
+
+#include "debug.h"
+#include "v9fs.h"
+#include "9p.h"
+#include "v9fs_vfs.h"
+#include "conv.h"
+#include "fid.h"
+
+static struct inode_operations v9fs_dir_inode_operations;
+static struct inode_operations v9fs_file_inode_operations;
+static struct inode_operations v9fs_symlink_inode_operations;
+
+/**
+ * unixmode2p9mode - convert unix mode bits to plan 9
+ * @v9ses: v9fs session information
+ * @mode: mode to convert
+ *
+ */
+
+static inline int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
+{
+        int res;
+        res = mode & 0777;
+        if (S_ISDIR(mode))
+                res |= V9FS_DMDIR;
+        if (v9ses->extended) {
+                if (S_ISLNK(mode))
+                        res |= V9FS_DMSYMLINK;
+                if (v9ses->nodev == 0) {
+                        if (S_ISSOCK(mode))
+                                res |= V9FS_DMSOCKET;
+                        if (S_ISFIFO(mode))
+                                res |= V9FS_DMNAMEDPIPE;
+                        if (S_ISBLK(mode))
+                                res |= V9FS_DMDEVICE;
+                        if (S_ISCHR(mode))
+                                res |= V9FS_DMDEVICE;
+                }
+
+                if ((mode & S_ISUID) == S_ISUID)
+                        res |= V9FS_DMSETUID;
+                if ((mode & S_ISGID) == S_ISGID)
+                        res |= V9FS_DMSETGID;
+                if ((mode & V9FS_DMLINK))
+                        res |= V9FS_DMLINK;
+        }
+
+        return res;
+}
+
+/**
+ * p9mode2unixmode- convert plan9 mode bits to unix mode bits
+ * @v9ses: v9fs session information
+ * @mode: mode to convert
+ *
+ */
+
+static inline int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
+{
+        int res;
+
+        res = mode & 0777;
+
+        if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
+                res |= S_IFDIR;
+        else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
+                res |= S_IFLNK;
+        else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
+                 && (v9ses->nodev == 0))
+                res |= S_IFSOCK;
+        else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
+                 && (v9ses->nodev == 0))
+                res |= S_IFIFO;
+        else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
+                 && (v9ses->nodev == 0))
+                res |= S_IFBLK;
+        else
+                res |= S_IFREG;
+
+        if (v9ses->extended) {
+                if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
+                        res |= S_ISUID;
+
+                if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
+                        res |= S_ISGID;
+        }
+
+        return res;
+}
+
+/**
+ * v9fs_blank_mistat - helper function to setup a 9P stat structure
+ * @v9ses: 9P session info (for determining extended mode)
+ * @mistat: structure to initialize
+ *
+ */
+
+static inline void
+v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat)
+{
+        mistat->type = ~0;
+        mistat->dev = ~0;
+        mistat->qid.type = ~0;
+        mistat->qid.version = ~0;
+        *((long long *)&mistat->qid.path) = ~0;
+        mistat->mode = ~0;
+        mistat->atime = ~0;
+        mistat->mtime = ~0;
+        mistat->length = ~0;
+        mistat->name = mistat->data;
+        mistat->uid = mistat->data;
+        mistat->gid = mistat->data;
+        mistat->muid = mistat->data;
+        if (v9ses->extended) {
+                mistat->n_uid = ~0;
+                mistat->n_gid = ~0;
+                mistat->n_muid = ~0;
+                mistat->extension = mistat->data;
+        }
+        *mistat->data = 0;
+}
+
+/**
+ * v9fs_mistat2unix - convert mistat to unix stat
+ * @mistat: Plan 9 metadata (mistat) structure
+ * @stat: unix metadata (stat) structure to populate
+ * @sb: superblock
+ *
+ */
+
+static void
+v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf,
+                 struct super_block *sb)
+{
+        struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL;
+
+        buf->st_nlink = 1;
+
+        buf->st_atime = mistat->atime;
+        buf->st_mtime = mistat->mtime;
+        buf->st_ctime = mistat->mtime;
+
+        if (v9ses && v9ses->extended) {
+                /* TODO: string to uid mapping via user-space daemon */
+                buf->st_uid = mistat->n_uid;
+                buf->st_gid = mistat->n_gid;
+
+                sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
+                sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
+        } else {
+                buf->st_uid = v9ses->uid;
+                buf->st_gid = v9ses->gid;
+        }
+
+        buf->st_uid = (unsigned short)-1;
+        buf->st_gid = (unsigned short)-1;
+
+        if (v9ses && v9ses->extended) {
+                if (mistat->n_uid != -1)
+                        sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
+
+                if (mistat->n_gid != -1)
+                        sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
+        }
+
+        if (buf->st_uid == (unsigned short)-1)
+                buf->st_uid = v9ses->uid;
+        if (buf->st_gid == (unsigned short)-1)
+                buf->st_gid = v9ses->gid;
+
+        buf->st_mode = p9mode2unixmode(v9ses, mistat->mode);
+        if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) {
+                char type = 0;
+                int major = -1;
+                int minor = -1;
+                sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
+                switch (type) {
+                case 'c':
+                        buf->st_mode &= ~S_IFBLK;
+                        buf->st_mode |= S_IFCHR;
+                        break;
+                case 'b':
+                        break;
+                default:
+                        dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
+                                type, mistat->extension);
+                };
+                buf->st_rdev = MKDEV(major, minor);
+        } else
+                buf->st_rdev = 0;
+
+        buf->st_size = mistat->length;
+
+        buf->st_blksize = sb->s_blocksize;
+        buf->st_blocks =
+            (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits;
+}
+
+/**
+ * v9fs_get_inode - helper function to setup an inode
+ * @sb: superblock
+ * @mode: mode to setup inode with
+ *
+ */
+
+struct inode *v9fs_get_inode(struct super_block *sb, int mode)
+{
+        struct inode *inode = NULL;
+
+        dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
+
+        inode = new_inode(sb);
+        if (inode) {
+                inode->i_mode = mode;
+                inode->i_uid = current->fsuid;
+                inode->i_gid = current->fsgid;
+                inode->i_blksize = sb->s_blocksize;
+                inode->i_blocks = 0;
+                inode->i_rdev = 0;
+                inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+                switch (mode & S_IFMT) {
+                case S_IFIFO:
+                case S_IFBLK:
+                case S_IFCHR:
+                case S_IFSOCK:
+                case S_IFREG:
+                        inode->i_op = &v9fs_file_inode_operations;
+                        inode->i_fop = &v9fs_file_operations;
+                        break;
+                case S_IFDIR:
+                        inode->i_nlink++;
+                        inode->i_op = &v9fs_dir_inode_operations;
+                        inode->i_fop = &v9fs_dir_operations;
+                        break;
+                case S_IFLNK:
+                        inode->i_op = &v9fs_symlink_inode_operations;
+                        break;
+                default:
+                        dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
+                                mode, mode & S_IFMT);
+                        return ERR_PTR(-EINVAL);
+                }
+        } else {
+                eprintk(KERN_WARNING, "Problem allocating inode\n");
+                return ERR_PTR(-ENOMEM);
+        }
+        return inode;
+}
+
+/**
+ * v9fs_create - helper function to create files and directories
+ * @dir: directory inode file is being created in
+ * @file_dentry: dentry file is being created in
+ * @perm: permissions file is being created with
+ * @open_mode: resulting open mode for file ???
+ *
+ */
+
+static int
+v9fs_create(struct inode *dir,
+            struct dentry *file_dentry,
+            unsigned int perm, unsigned int open_mode)
+{
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
+        struct super_block *sb = dir->i_sb;
+        struct v9fs_fid *dirfid =
+            v9fs_fid_lookup(file_dentry->d_parent, FID_WALK);
+        struct v9fs_fid *fid = NULL;
+        struct inode *file_inode = NULL;
+        struct v9fs_fcall *fcall = NULL;
+        struct v9fs_qid qid;
+        struct stat newstat;
+        int dirfidnum = -1;
+        long newfid = -1;
+        int result = 0;
+        unsigned int iounit = 0;
+
+        perm = unixmode2p9mode(v9ses, perm);
+
+        dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir,
+                file_dentry, perm, open_mode);
+
+        if (!dirfid)
+                return -EBADF;
+
+        dirfidnum = dirfid->fid;
+        if (dirfidnum < 0) {
+                dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n",
+                        dir->i_ino);
+                return -EBADF;
+        }
+
+        if (file_dentry->d_inode) {
+                dprintk(DEBUG_ERROR,
+                        "Odd. There is an inode for dir %lu, name :%s:\n",
+                        dir->i_ino, file_dentry->d_name.name);
+                return -EEXIST;
+        }
+
+        newfid = v9fs_get_idpool(&v9ses->fidpool);
+        if (newfid < 0) {
+                eprintk(KERN_WARNING, "no free fids available\n");
+                return -ENOSPC;
+        }
+
+        result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
+        if (result < 0) {
+                dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
+                v9fs_put_idpool(newfid, &v9ses->fidpool);
+                newfid = 0;
+                goto CleanUpFid;
+        }
+
+        kfree(fcall);
+
+        result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
+                               perm, open_mode, &fcall);
+        if (result < 0) {
+                dprintk(DEBUG_ERROR, "create fails: %s(%d)\n",
+                        FCALL_ERROR(fcall), result);
+
+                goto CleanUpFid;
+        }
+
+        iounit = fcall->params.rcreate.iounit;
+        qid = fcall->params.rcreate.qid;
+        kfree(fcall);
+
+        fid = v9fs_fid_create(file_dentry);
+        if (!fid) {
+                result = -ENOMEM;
+                goto CleanUpFid;
+        }
+
+        fid->fid = newfid;
+        fid->fidopen = 0;
+        fid->fidcreate = 1;
+        fid->qid = qid;
+        fid->iounit = iounit;
+        fid->rdir_pos = 0;
+        fid->rdir_fcall = NULL;
+        fid->v9ses = v9ses;
+
+        if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) ||
+            (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) ||
+            (perm & V9FS_DMDEVICE))
+                return 0;
+
+        result = v9fs_t_stat(v9ses, newfid, &fcall);
+        if (result < 0) {
+                dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall),
+                        result);
+                goto CleanUpFid;
+        }
+
+        v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
+
+        file_inode = v9fs_get_inode(sb, newstat.st_mode);
+        if ((!file_inode) || IS_ERR(file_inode)) {
+                dprintk(DEBUG_ERROR, "create inode failed\n");
+                result = -EBADF;
+                goto CleanUpFid;
+        }
+
+        v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb);
+        kfree(fcall);
+        d_instantiate(file_dentry, file_inode);
+
+        if (perm & V9FS_DMDIR) {
+                if (v9fs_t_clunk(v9ses, newfid, &fcall))
+                        dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
+                                FCALL_ERROR(fcall));
+
+                v9fs_put_idpool(newfid, &v9ses->fidpool);
+                kfree(fcall);
+                fid->fidopen = 0;
+                fid->fidcreate = 0;
+                d_drop(file_dentry);
+        }
+
+        return 0;
+
+      CleanUpFid:
+        kfree(fcall);
+
+        if (newfid) {
+                if (v9fs_t_clunk(v9ses, newfid, &fcall))
+                        dprintk(DEBUG_ERROR, "clunk failed: %s\n",
+                                FCALL_ERROR(fcall));
+
+                v9fs_put_idpool(newfid, &v9ses->fidpool);
+                kfree(fcall);
+        }
+        return result;
+}
+
+/**
+ * v9fs_remove - helper function to remove files and directories
+ * @inode: directory inode that is being deleted
+ * @dentry:  dentry that is being deleted
+ * @rmdir: where we are a file or a directory
+ *
+ */
+
+static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
+{
+        struct v9fs_fcall *fcall = NULL;
+        struct super_block *sb = NULL;
+        struct v9fs_session_info *v9ses = NULL;
+        struct v9fs_fid *v9fid = NULL;
+        struct inode *file_inode = NULL;
+        int fid = -1;
+        int result = 0;
+
+        dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
+                rmdir);
+
+        file_inode = file->d_inode;
+        sb = file_inode->i_sb;
+        v9ses = v9fs_inode2v9ses(file_inode);
+        v9fid = v9fs_fid_lookup(file, FID_OP);
+
+        if (!v9fid) {
+                dprintk(DEBUG_ERROR,
+                        "no v9fs_fid\n");
+                return -EBADF;
+        }
+
+        fid = v9fid->fid;
+        if (fid < 0) {
+                dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
+                        file_inode->i_ino);
+                return -EBADF;
+        }
+
+        result = v9fs_t_remove(v9ses, fid, &fcall);
+        if (result < 0)
+                dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n",
+                        FCALL_ERROR(fcall), result);
+        else {
+                v9fs_put_idpool(fid, &v9ses->fidpool);
+                v9fs_fid_destroy(v9fid);
+        }
+
+        kfree(fcall);
+        return result;
+}
+
+/**
+ * v9fs_vfs_create - VFS hook to create files
+ * @inode: directory inode that is being deleted
+ * @dentry:  dentry that is being deleted
+ * @perm: create permissions
+ * @nd: path information
+ *
+ */
+
+static int
+v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
+                struct nameidata *nd)
+{
+        return v9fs_create(inode, dentry, perm, O_RDWR);
+}
+
+/**
+ * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
+ * @i:  inode that is being unlinked
+ * @dentry: dentry that is being unlinked
+ * @mode: mode for new directory
+ *
+ */
+
+static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
+{
+        return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
+}
+
+/**
+ * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
+ * @dir:  inode that is being walked from
+ * @dentry: dentry that is being walked to?
+ * @nameidata: path data
+ *
+ */
+
+static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
+                                      struct nameidata *nameidata)
+{
+        struct super_block *sb;
+        struct v9fs_session_info *v9ses;
+        struct v9fs_fid *dirfid;
+        struct v9fs_fid *fid;
+        struct inode *inode;
+        struct v9fs_fcall *fcall = NULL;
+        struct stat newstat;
+        int dirfidnum = -1;
+        int newfid = -1;
+        int result = 0;
+
+        dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
+                dir, dentry->d_iname, dentry, nameidata);
+
+        sb = dir->i_sb;
+        v9ses = v9fs_inode2v9ses(dir);
+        dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK);
+
+        if (!dirfid) {
+                dprintk(DEBUG_ERROR, "no dirfid\n");
+                return ERR_PTR(-EINVAL);
+        }
+
+        dirfidnum = dirfid->fid;
+
+        if (dirfidnum < 0) {
+                dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
+                        dir, dir->i_ino);
+                return ERR_PTR(-EBADF);
+        }
+
+        newfid = v9fs_get_idpool(&v9ses->fidpool);
+        if (newfid < 0) {
+                eprintk(KERN_WARNING, "newfid fails!\n");
+                return ERR_PTR(-ENOSPC);
+        }
+
+        result =
+            v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
+                        NULL);
+        if (result < 0) {
+                v9fs_put_idpool(newfid, &v9ses->fidpool);
+                if (result == -ENOENT) {
+                        d_add(dentry, NULL);
+                        dprintk(DEBUG_ERROR,
+                                "Return negative dentry %p count %d\n",
+                                dentry, atomic_read(&dentry->d_count));
+                        return NULL;
+                }
+                dprintk(DEBUG_ERROR, "walk error:%d\n", result);
+                goto FreeFcall;
+        }
+
+        result = v9fs_t_stat(v9ses, newfid, &fcall);
+        if (result < 0) {
+                dprintk(DEBUG_ERROR, "stat error\n");
+                goto FreeFcall;
+        }
+
+        v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
+        inode = v9fs_get_inode(sb, newstat.st_mode);
+
+        if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
+                eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
+                        PTR_ERR(inode));
+
+                result = -ENOSPC;
+                goto FreeFcall;
+        }
+
+        inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid);
+
+        fid = v9fs_fid_create(dentry);
+        if (fid == NULL) {
+                dprintk(DEBUG_ERROR, "couldn't insert\n");
+                result = -ENOMEM;
+                goto FreeFcall;
+        }
+
+        fid->fid = newfid;
+        fid->fidopen = 0;
+        fid->v9ses = v9ses;
+        fid->qid = fcall->params.rstat.stat->qid;
+
+        dentry->d_op = &v9fs_dentry_operations;
+        v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb);
+
+        d_add(dentry, inode);
+        kfree(fcall);
+
+        return NULL;
+
+      FreeFcall:
+        kfree(fcall);
+        return ERR_PTR(result);
+}
+
+/**
+ * v9fs_vfs_unlink - VFS unlink hook to delete an inode
+ * @i:  inode that is being unlinked
+ * @dentry: dentry that is being unlinked
+ *
+ */
+
+static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
+{
+        return v9fs_remove(i, d, 0);
+}
+
+/**
+ * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
+ * @i:  inode that is being unlinked
+ * @dentry: dentry that is being unlinked
+ *
+ */
+
+static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
+{
+        return v9fs_remove(i, d, 1);
+}
+
+/**
+ * v9fs_vfs_rename - VFS hook to rename an inode
+ * @old_dir:  old dir inode
+ * @old_dentry: old dentry
+ * @new_dir: new dir inode
+ * @new_dentry: new dentry
+ *
+ */
+
+static int
+v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+                struct inode *new_dir, struct dentry *new_dentry)
+{
+        struct inode *old_inode = old_dentry->d_inode;
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
+        struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_WALK);
+        struct v9fs_fid *olddirfid =
+            v9fs_fid_lookup(old_dentry->d_parent, FID_WALK);
+        struct v9fs_fid *newdirfid =
+            v9fs_fid_lookup(new_dentry->d_parent, FID_WALK);
+        struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+        struct v9fs_fcall *fcall = NULL;
+        int fid = -1;
+        int olddirfidnum = -1;
+        int newdirfidnum = -1;
+        int retval = 0;
+
+        dprintk(DEBUG_VFS, "\n");
+
+        if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
+                dprintk(DEBUG_ERROR, "problem with arguments\n");
+                return -EBADF;
+        }
+
+        /* 9P can only handle file rename in the same directory */
+        if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
+                dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
+                retval = -EPERM;
+                goto FreeFcallnBail;
+        }
+
+        fid = oldfid->fid;
+        olddirfidnum = olddirfid->fid;
+        newdirfidnum = newdirfid->fid;
+
+        if (fid < 0) {
+                dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
+                        old_inode->i_ino);
+                retval = -EBADF;
+                goto FreeFcallnBail;
+        }
+
+        v9fs_blank_mistat(v9ses, mistat);
+
+        strcpy(mistat->data + 1, v9ses->name);
+        mistat->name = mistat->data + 1 + strlen(v9ses->name);
+
+        if (new_dentry->d_name.len >
+            (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) {
+                dprintk(DEBUG_ERROR, "new name too long\n");
+                goto FreeFcallnBail;
+        }
+
+        strcpy(mistat->name, new_dentry->d_name.name);
+        retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
+
+      FreeFcallnBail:
+        kfree(mistat);
+
+        if (retval < 0)
+                dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
+                        FCALL_ERROR(fcall));
+
+        kfree(fcall);
+        return retval;
+}
+
+/**
+ * v9fs_vfs_getattr - retreive file metadata
+ * @mnt - mount information
+ * @dentry - file to get attributes on
+ * @stat - metadata structure to populate
+ *
+ */
+
+static int
+v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
+                 struct kstat *stat)
+{
+        struct v9fs_fcall *fcall = NULL;
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
+        struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
+        int err = -EPERM;
+
+        dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
+        if (!fid) {
+                dprintk(DEBUG_ERROR,
+                        "couldn't find fid associated with dentry\n");
+                return -EBADF;
+        }
+
+        err = v9fs_t_stat(v9ses, fid->fid, &fcall);
+
+        if (err < 0)
+                dprintk(DEBUG_ERROR, "stat error\n");
+        else {
+                v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode,
+                                  dentry->d_inode->i_sb);
+                generic_fillattr(dentry->d_inode, stat);
+        }
+
+        kfree(fcall);
+        return err;
+}
+
+/**
+ * v9fs_vfs_setattr - set file metadata
+ * @dentry: file whose metadata to set
+ * @iattr: metadata assignment structure
+ *
+ */
+
+static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
+        struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
+        struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+        struct v9fs_fcall *fcall = NULL;
+        int res = -EPERM;
+
+        dprintk(DEBUG_VFS, "\n");
+        if (!fid) {
+                dprintk(DEBUG_ERROR,
+                        "Couldn't find fid associated with dentry\n");
+                return -EBADF;
+        }
+
+        if (!mistat)
+                return -ENOMEM;
+
+        v9fs_blank_mistat(v9ses, mistat);
+        if (iattr->ia_valid & ATTR_MODE)
+                mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
+
+        if (iattr->ia_valid & ATTR_MTIME)
+                mistat->mtime = iattr->ia_mtime.tv_sec;
+
+        if (iattr->ia_valid & ATTR_ATIME)
+                mistat->atime = iattr->ia_atime.tv_sec;
+
+        if (iattr->ia_valid & ATTR_SIZE)
+                mistat->length = iattr->ia_size;
+
+        if (v9ses->extended) {
+                char *uid = kmalloc(strlen(mistat->uid), GFP_KERNEL);
+                char *gid = kmalloc(strlen(mistat->gid), GFP_KERNEL);
+                char *muid = kmalloc(strlen(mistat->muid), GFP_KERNEL);
+                char *name = kmalloc(strlen(mistat->name), GFP_KERNEL);
+                char *extension = kmalloc(strlen(mistat->extension),
+                                          GFP_KERNEL);
+
+                if ((!uid) || (!gid) || (!muid) || (!name) || (!extension)) {
+                        kfree(uid);
+                        kfree(gid);
+                        kfree(muid);
+                        kfree(name);
+                        kfree(extension);
+
+                        return -ENOMEM;
+                }
+
+                strcpy(uid, mistat->uid);
+                strcpy(gid, mistat->gid);
+                strcpy(muid, mistat->muid);
+                strcpy(name, mistat->name);
+                strcpy(extension, mistat->extension);
+
+                if (iattr->ia_valid & ATTR_UID) {
+                        if (strlen(uid) != 8) {
+                                dprintk(DEBUG_ERROR, "uid strlen is %u not 8\n",
+                                        (unsigned int)strlen(uid));
+                                sprintf(uid, "%08x", iattr->ia_uid);
+                        } else {
+                                kfree(uid);
+                                uid = kmalloc(9, GFP_KERNEL);
+                        }
+
+                        sprintf(uid, "%08x", iattr->ia_uid);
+                        mistat->n_uid = iattr->ia_uid;
+                }
+
+                if (iattr->ia_valid & ATTR_GID) {
+                        if (strlen(gid) != 8)
+                                dprintk(DEBUG_ERROR, "gid strlen is %u not 8\n",
+                                        (unsigned int)strlen(gid));
+                        else {
+                                kfree(gid);
+                                gid = kmalloc(9, GFP_KERNEL);
+                        }
+
+                        sprintf(gid, "%08x", iattr->ia_gid);
+                        mistat->n_gid = iattr->ia_gid;
+                }
+
+                mistat->uid = mistat->data;
+                strcpy(mistat->uid, uid);
+                mistat->gid = mistat->data + strlen(uid) + 1;
+                strcpy(mistat->gid, gid);
+                mistat->muid = mistat->gid + strlen(gid) + 1;
+                strcpy(mistat->muid, muid);
+                mistat->name = mistat->muid + strlen(muid) + 1;
+                strcpy(mistat->name, name);
+                mistat->extension = mistat->name + strlen(name) + 1;
+                strcpy(mistat->extension, extension);
+
+                kfree(uid);
+                kfree(gid);
+                kfree(muid);
+                kfree(name);
+                kfree(extension);
+        }
+
+        res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
+
+        if (res < 0)
+                dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall));
+
+        kfree(mistat);
+        kfree(fcall);
+
+        if (res >= 0)
+                res = inode_setattr(dentry->d_inode, iattr);
+
+        return res;
+}
+
+/**
+ * v9fs_mistat2inode - populate an inode structure with mistat info
+ * @mistat: Plan 9 metadata (mistat) structure
+ * @inode: inode to populate
+ * @sb: superblock of filesystem
+ *
+ */
+
+void
+v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
+                  struct super_block *sb)
+{
+        struct v9fs_session_info *v9ses = sb->s_fs_info;
+
+        inode->i_nlink = 1;
+
+        inode->i_atime.tv_sec = mistat->atime;
+        inode->i_mtime.tv_sec = mistat->mtime;
+        inode->i_ctime.tv_sec = mistat->mtime;
+
+        inode->i_uid = -1;
+        inode->i_gid = -1;
+
+        if (v9ses->extended) {
+                /* TODO: string to uid mapping via user-space daemon */
+                inode->i_uid = mistat->n_uid;
+                inode->i_gid = mistat->n_gid;
+
+                if (mistat->n_uid == -1)
+                        sscanf(mistat->uid, "%x", &inode->i_uid);
+
+                if (mistat->n_gid == -1)
+                        sscanf(mistat->gid, "%x", &inode->i_gid);
+        }
+
+        if (inode->i_uid == -1)
+                inode->i_uid = v9ses->uid;
+        if (inode->i_gid == -1)
+                inode->i_gid = v9ses->gid;
+
+        inode->i_mode = p9mode2unixmode(v9ses, mistat->mode);
+        if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
+                char type = 0;
+                int major = -1;
+                int minor = -1;
+                sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
+                switch (type) {
+                case 'c':
+                        inode->i_mode &= ~S_IFBLK;
+                        inode->i_mode |= S_IFCHR;
+                        break;
+                case 'b':
+                        break;
+                default:
+                        dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
+                                type, mistat->extension);
+                };
+                inode->i_rdev = MKDEV(major, minor);
+        } else
+                inode->i_rdev = 0;
+
+        inode->i_size = mistat->length;
+
+        inode->i_blksize = sb->s_blocksize;
+        inode->i_blocks =
+            (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
+}
+
+/**
+ * v9fs_qid2ino - convert qid into inode number
+ * @qid: qid to hash
+ *
+ * BUG: potential for inode number collisions?
+ */
+
+ino_t v9fs_qid2ino(struct v9fs_qid *qid)
+{
+        u64 path = qid->path + 2;
+        ino_t i = 0;
+
+        if (sizeof(ino_t) == sizeof(path))
+                memcpy(&i, &path, sizeof(ino_t));
+        else
+                i = (ino_t) (path ^ (path >> 32));
+
+        return i;
+}
+
+/**
+ * v9fs_vfs_symlink - helper function to create symlinks
+ * @dir: directory inode containing symlink
+ * @dentry: dentry for symlink
+ * @symname: symlink data
+ *
+ * See 9P2000.u RFC for more information
+ *
+ */
+
+static int
+v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+{
+        int retval = -EPERM;
+        struct v9fs_fid *newfid;
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
+        struct super_block *sb = dir ? dir->i_sb : NULL;
+        struct v9fs_fcall *fcall = NULL;
+        struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+
+        dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
+                symname);
+
+        if ((!dentry) || (!sb) || (!v9ses)) {
+                dprintk(DEBUG_ERROR, "problem with arguments\n");
+                return -EBADF;
+        }
+
+        if (!v9ses->extended) {
+                dprintk(DEBUG_ERROR, "not extended\n");
+                goto FreeFcall;
+        }
+
+        /* issue a create */
+        retval = v9fs_create(dir, dentry, S_IFLNK, 0);
+        if (retval != 0)
+                goto FreeFcall;
+
+        newfid = v9fs_fid_lookup(dentry, FID_OP);
+
+        /* issue a twstat */
+        v9fs_blank_mistat(v9ses, mistat);
+        strcpy(mistat->data + 1, symname);
+        mistat->extension = mistat->data + 1;
+        retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
+        if (retval < 0) {
+                dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
+                        FCALL_ERROR(fcall));
+                goto FreeFcall;
+        }
+
+        kfree(fcall);
+
+        if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
+                dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
+                        FCALL_ERROR(fcall));
+                goto FreeFcall;
+        }
+
+        d_drop(dentry);         /* FID - will this also clunk? */
+
+      FreeFcall:
+        kfree(mistat);
+        kfree(fcall);
+
+        return retval;
+}
+
+/**
+ * v9fs_readlink - read a symlink's location (internal version)
+ * @dentry: dentry for symlink
+ * @buf: buffer to load symlink location into
+ * @buflen: length of buffer
+ *
+ */
+
+static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
+{
+        int retval = -EPERM;
+
+        struct v9fs_fcall *fcall = NULL;
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
+        struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
+
+        if (!fid) {
+                dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
+                retval = -EBADF;
+                goto FreeFcall;
+        }
+
+        if (!v9ses->extended) {
+                retval = -EBADF;
+                dprintk(DEBUG_ERROR, "not extended\n");
+                goto FreeFcall;
+        }
+
+        dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
+        retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
+
+        if (retval < 0) {
+                dprintk(DEBUG_ERROR, "stat error\n");
+                goto FreeFcall;
+        }
+
+        if (!fcall)
+                return -EIO;
+
+        if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
+                retval = -EINVAL;
+                goto FreeFcall;
+        }
+
+        /* copy extension buffer into buffer */
+        if (strlen(fcall->params.rstat.stat->extension) < buflen)
+                buflen = strlen(fcall->params.rstat.stat->extension);
+
+        memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1);
+
+        retval = buflen;
+
+      FreeFcall:
+        kfree(fcall);
+
+        return retval;
+}
+
+/**
+ * v9fs_vfs_readlink - read a symlink's location
+ * @dentry: dentry for symlink
+ * @buf: buffer to load symlink location into
+ * @buflen: length of buffer
+ *
+ */
+
+static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
+                             int buflen)
+{
+        int retval;
+        int ret;
+        char *link = __getname();
+
+        if (strlen(link) < buflen)
+                buflen = strlen(link);
+
+        dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+
+        retval = v9fs_readlink(dentry, link, buflen);
+
+        if (retval > 0) {
+                if ((ret = copy_to_user(buffer, link, retval)) != 0) {
+                        dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
+                                ret);
+                        retval = ret;
+                }
+        }
+
+        putname(link);
+        return retval;
+}
+
+/**
+ * v9fs_vfs_follow_link - follow a symlink path
+ * @dentry: dentry for symlink
+ * @nd: nameidata
+ *
+ */
+
+static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+        int len = 0;
+        char *link = __getname();
+
+        dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
+
+        if (!link)
+                link = ERR_PTR(-ENOMEM);
+        else {
+                len = v9fs_readlink(dentry, link, strlen(link));
+
+                if (len < 0) {
+                        putname(link);
+                        link = ERR_PTR(len);
+                } else
+                        link[len] = 0;
+        }
+        nd_set_link(nd, link);
+
+        return NULL;
+}
+
+/**
+ * v9fs_vfs_put_link - release a symlink path
+ * @dentry: dentry for symlink
+ * @nd: nameidata
+ *
+ */
+
+static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
+{
+        char *s = nd_get_link(nd);
+
+        dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
+        if (!IS_ERR(s))
+                putname(s);
+}
+
+/**
+ * v9fs_vfs_link - create a hardlink
+ * @old_dentry: dentry for file to link to
+ * @dir: inode destination for new link
+ * @new_dentry: dentry for link
+ *
+ */
+
+/* XXX - lots of code dup'd from symlink and creates,
+ * figure out a better reuse strategy
+ */
+
+static int
+v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
+              struct dentry *dentry)
+{
+        int retval = -EPERM;
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
+        struct v9fs_fcall *fcall = NULL;
+        struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+        struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP);
+        struct v9fs_fid *newfid = NULL;
+        char *symname = __getname();
+
+        dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
+                old_dentry->d_name.name);
+
+        if (!v9ses->extended) {
+                dprintk(DEBUG_ERROR, "not extended\n");
+                goto FreeMem;
+        }
+
+        /* get fid of old_dentry */
+        sprintf(symname, "hardlink(%d)\n", oldfid->fid);
+
+        /* issue a create */
+        retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0);
+        if (retval != 0)
+                goto FreeMem;
+
+        newfid = v9fs_fid_lookup(dentry, FID_OP);
+        if (!newfid) {
+                dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
+                goto FreeMem;
+        }
+
+        /* issue a twstat */
+        v9fs_blank_mistat(v9ses, mistat);
+        strcpy(mistat->data + 1, symname);
+        mistat->extension = mistat->data + 1;
+        retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
+        if (retval < 0) {
+                dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
+                        FCALL_ERROR(fcall));
+                goto FreeMem;
+        }
+
+        kfree(fcall);
+
+        if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
+                dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
+                        FCALL_ERROR(fcall));
+                goto FreeMem;
+        }
+
+        d_drop(dentry);         /* FID - will this also clunk? */
+
+        kfree(fcall);
+        fcall = NULL;
+
+      FreeMem:
+        kfree(mistat);
+        kfree(fcall);
+        putname(symname);
+        return retval;
+}
+
+/**
+ * v9fs_vfs_mknod - create a special file
+ * @dir: inode destination for new link
+ * @dentry: dentry for file
+ * @mode: mode for creation
+ * @dev_t: device associated with special file
+ *
+ */
+
+static int
+v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
+{
+        int retval = -EPERM;
+        struct v9fs_fid *newfid;
+        struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
+        struct v9fs_fcall *fcall = NULL;
+        struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
+        char *symname = __getname();
+
+        dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
+                dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
+
+        if (!new_valid_dev(rdev)) {
+                retval = -EINVAL;
+                goto FreeMem;
+        }
+
+        if (!v9ses->extended) {
+                dprintk(DEBUG_ERROR, "not extended\n");
+                goto FreeMem;
+        }
+
+        /* issue a create */
+        retval = v9fs_create(dir, dentry, mode, 0);
+
+        if (retval != 0)
+                goto FreeMem;
+
+        newfid = v9fs_fid_lookup(dentry, FID_OP);
+        if (!newfid) {
+                dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
+                retval = -EINVAL;
+                goto FreeMem;
+        }
+
+        /* build extension */
+        if (S_ISBLK(mode))
+                sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
+        else if (S_ISCHR(mode))
+                sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
+        else if (S_ISFIFO(mode)) ;      /* DO NOTHING */
+        else {
+                retval = -EINVAL;
+                goto FreeMem;
+        }
+
+        if (!S_ISFIFO(mode)) {
+                /* issue a twstat */
+                v9fs_blank_mistat(v9ses, mistat);
+                strcpy(mistat->data + 1, symname);
+                mistat->extension = mistat->data + 1;
+                retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
+                if (retval < 0) {
+                        dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
+                                FCALL_ERROR(fcall));
+                        goto FreeMem;
+                }
+
+                kfree(fcall);
+        }
+
+        /* need to update dcache so we show up */
+        kfree(fcall);
+
+        if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
+                dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
+                        FCALL_ERROR(fcall));
+                goto FreeMem;
+        }
+
+        d_drop(dentry);         /* FID - will this also clunk? */
+
+      FreeMem:
+        kfree(mistat);
+        kfree(fcall);
+        putname(symname);
+
+        return retval;
+}
+
+static struct inode_operations v9fs_dir_inode_operations = {
+        .create = v9fs_vfs_create,
+        .lookup = v9fs_vfs_lookup,
+        .symlink = v9fs_vfs_symlink,
+        .link = v9fs_vfs_link,
+        .unlink = v9fs_vfs_unlink,
+        .mkdir = v9fs_vfs_mkdir,
+        .rmdir = v9fs_vfs_rmdir,
+        .mknod = v9fs_vfs_mknod,
+        .rename = v9fs_vfs_rename,
+        .readlink = v9fs_vfs_readlink,
+        .getattr = v9fs_vfs_getattr,
+        .setattr = v9fs_vfs_setattr,
+};
+
+static struct inode_operations v9fs_file_inode_operations = {
+        .getattr = v9fs_vfs_getattr,
+        .setattr = v9fs_vfs_setattr,
+};
+
+static struct inode_operations v9fs_symlink_inode_operations = {
+        .readlink = v9fs_vfs_readlink,
+        .follow_link = v9fs_vfs_follow_link,
+        .put_link = v9fs_vfs_put_link,
+        .getattr = v9fs_vfs_getattr,
+        .setattr = v9fs_vfs_setattr,
+};