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    Subject[RFC][patch 3/7] v9fs: VFS inode operations (2.0-rc6)
    This is part [3/7] of the v9fs-2.0-rc6 patch against Linux v2.6.12-rc4.

    This part of the patch contains the VFS inode interfaces.

    Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

    vfs_inode.c | 1534 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 1534 insertions(+)

    -------------


    Index: fs/9p/vfs_inode.c
    ===================================================================
    --- /dev/null (tree:0bf32353105286a5624aeea862d35a4bbae09851)
    +++ 178666ee376655ef8ec19a2ffc0490241b428110/fs/9p/vfs_inode.c (mode:100644)
    @@ -0,0 +1,1534 @@
    +/*
    + * 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 the Free Software
    + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 "debug.h"
    +#include "idpool.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->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);
    + switch (mode & S_IFMT) {
    + default:
    + dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", mode,
    + mode & S_IFMT);
    + return ERR_PTR(-EINVAL);
    + break;
    + case S_IFREG:
    + case S_IFDIR:
    + case S_IFLNK:
    + case S_IFIFO:
    + case S_IFBLK:
    + case S_IFCHR:
    + case S_IFSOCK:
    + break;
    + }
    +
    + 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) {
    + default:
    + panic("Can't happen");
    + break;
    + 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;
    + }
    + } 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 ? dir->i_sb : NULL;
    + 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) || (!sb) || (!v9ses)) {
    + dprintk(DEBUG_ERROR, "problem with arguments\n");
    + 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;
    + }
    +
    + safe_cache_free(v9ses->slab, 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;
    + safe_cache_free(v9ses->slab, 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);
    + safe_cache_free(v9ses->slab, 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);
    + safe_cache_free(v9ses->slab, fcall);
    + fid->fidopen = 0;
    + fid->fidcreate = 0;
    + d_drop(file_dentry);
    + }
    +
    + return 0;
    +
    + CleanUpFid:
    + safe_cache_free(v9ses->slab, 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);
    + safe_cache_free(v9ses->slab, 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);
    +
    + if (!dir || !S_ISDIR(dir->i_mode)) {
    + dprintk(DEBUG_ERROR, "dir inode is NULL or not a directory\n");
    + return -ENOENT;
    + }
    +
    + if (!file) {
    + dprintk(DEBUG_ERROR, "NO dentry for file to remove\n");
    + return -EBADF;
    + }
    +
    + if (!file->d_inode) {
    + dprintk(DEBUG_ERROR,
    + "dentry %p NO INODE for file to remove!\n", file);
    + return -EBADF;
    + }
    +
    + file_inode = file->d_inode;
    + sb = file_inode->i_sb;
    + v9ses = v9fs_inode2v9ses(file_inode);
    + v9fid = v9fs_fid_lookup(file, FID_OP);
    +
    + if (!sb || !v9ses || !v9fid) {
    + dprintk(DEBUG_ERROR,
    + "no superblock or v9session or 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;
    + }
    +
    + if (rmdir && (!S_ISDIR(file_inode->i_mode))) {
    + dprintk(DEBUG_ERROR, "trying to remove non-directory\n");
    + return -ENOTDIR;
    + } else if ((!rmdir) && S_ISDIR(file_inode->i_mode)) {
    + dprintk(DEBUG_ERROR, "trying to remove directory\n");
    + return -EISDIR;
    + }
    +
    + 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);
    + }
    +
    + safe_cache_free(v9ses->slab, 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)
    +{
    + int retval = -EPERM;
    + int open_mode = O_RDWR;
    +
    + retval = v9fs_create(inode, dentry, perm, open_mode);
    +
    + return retval;
    +}
    +
    +/**
    + * 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)
    +{
    + int retval = -EPERM;
    + int open_mode = O_RDONLY;
    +
    + retval = v9fs_create(inode, dentry, mode | S_IFDIR, open_mode);
    +
    + return retval;
    +}
    +
    +/**
    + * v9fs_dentry_validate - VFS dcache hook to validate cache
    + * @dentry: dentry that is being validated
    + * @nd: path data
    + *
    + * dcache really shouldn't be used for 9P2000 as at all due to
    + * potential attached semantics to directory traversal (walk).
    + *
    + * FUTURE: look into how to use dcache to allow multi-stage
    + * walks in Plan 9 & potential for better dcache operation which
    + * would remain valid for Plan 9 semantics. Older versions
    + * had validation via stat for those interested. However, since
    + * stat has the same approximate overhead as walk there really
    + * is no difference. The only improvement would be from a
    + * time-decay cache like NFS has and that undermines the
    + * synchronous nature of 9P2000.
    + *
    + */
    +
    +static int v9fs_dentry_validate(struct dentry *dentry, struct nameidata *nd)
    +{
    + struct dentry *dc = current->fs->pwd;
    +
    + dprintk(DEBUG_VFS, "dentry: %s (%p)\n", dentry->d_iname, dentry);
    + if (v9fs_fid_lookup(dentry, FID_OP)) {
    + dprintk(DEBUG_VFS, "VALID\n");
    + return 1;
    + }
    +
    + while (dc != NULL) {
    + if (dc == dentry) {
    + dprintk(DEBUG_VFS, "VALID\n");
    + return 1;
    + }
    + if (dc == dc->d_parent)
    + break;
    +
    + dc = dc->d_parent;
    + }
    +
    + dprintk(DEBUG_VFS, "INVALID\n");
    + return 0;
    +}
    +
    +/**
    + * v9fs_dentry_delete - called when dentry refcount reaches 0
    +* @dentry: dentry that is being deleted
    + *
    + */
    +
    +static int v9fs_dentry_delete(struct dentry *dentry)
    +{
    + dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
    + return 1;
    +}
    +
    +/*
    + * v9fs_dentry_release - called when dentry is going to be freed
    +* @dentry: dentry that is being release
    + *
    + */
    +
    +void v9fs_dentry_release(struct dentry *dentry)
    +{
    + dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
    +
    + if (dentry->d_fsdata != NULL) {
    + struct list_head *fid_list =
    + (struct list_head *)dentry->d_fsdata;
    + struct list_head *temp;
    + struct v9fs_fid *current_fid = NULL;
    + struct list_head *p;
    + struct v9fs_fcall *fcall = NULL;
    +
    + list_for_each_safe(p, temp, fid_list) {
    + current_fid = list_entry(p, struct v9fs_fid, list);
    + if (v9fs_t_clunk
    + (current_fid->v9ses, current_fid->fid, &fcall))
    + dprintk(DEBUG_ERROR, "clunk failed: %s\n",
    + FCALL_ERROR(fcall));
    +
    + v9fs_put_idpool(current_fid->fid,
    + &current_fid->v9ses->fidpool);
    +
    + safe_cache_free(current_fid->v9ses->slab, fcall);
    + v9fs_fid_destroy(current_fid);
    + }
    +
    + kfree(dentry->d_fsdata); /* free the list_head */
    + }
    +}
    +
    +static struct dentry_operations v9fs_dentry_operations = {
    + .d_revalidate = v9fs_dentry_validate,
    + .d_delete = v9fs_dentry_delete,
    + .d_release = v9fs_dentry_release,
    +};
    +
    +/**
    + * 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 = NULL;
    + struct v9fs_session_info *v9ses = NULL;
    + struct v9fs_fid *dirfid = NULL;
    + struct v9fs_fid *fid = NULL;
    + struct inode *inode = NULL;
    + struct dentry *retval = NULL;
    + 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);
    +
    + if (!dir) {
    + dprintk(DEBUG_ERROR, "no dir inode\n");
    + return ERR_PTR(-EINVAL);
    + }
    +
    + sb = dir->i_sb;
    + v9ses = v9fs_inode2v9ses(dir);
    + dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK);
    +
    + if (!sb || !v9ses || !dirfid) {
    + dprintk(DEBUG_ERROR, "no superblock, v9ses, or 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);
    + safe_cache_free(v9ses->slab, fcall);
    +
    + return retval;
    +
    + FreeFcall:
    + safe_cache_free(v9ses->slab, 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)
    +{
    + int retval = -EPERM;
    +
    + retval = v9fs_remove(i, d, 0);
    + return retval;
    +}
    +
    +/**
    + * 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)
    +{
    + int retval = -EPERM;
    +
    + retval = v9fs_remove(i, d, 1);
    + return retval;
    +}
    +
    +/**
    + * 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 ? old_dentry->d_inode : NULL;
    + 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 = kmem_cache_alloc(v9ses->slab, 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 -EPERM;
    + }
    +
    + /* 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 FreeFcall;
    + }
    +
    + 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 FreeFcall;
    + }
    +
    + 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 FreeFcall;
    + }
    +
    + strcpy(mistat->name, new_dentry->d_name.name);
    + retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
    +
    + FreeFcall:
    + safe_cache_free(v9ses->slab, mistat);
    +
    + if (retval < 0)
    + dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
    + FCALL_ERROR(fcall));
    +
    + safe_cache_free(v9ses->slab, 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);
    + }
    +
    + safe_cache_free(v9ses->slab, 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 = kmem_cache_alloc(v9ses->slab, 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 = NULL;
    + char *gid = NULL;
    + char *muid = NULL;
    + char *name = NULL;
    + char *extension = NULL;
    +
    + uid = kmalloc(strlen(mistat->uid), GFP_KERNEL);
    + gid = kmalloc(strlen(mistat->gid), GFP_KERNEL);
    + muid = kmalloc(strlen(mistat->muid), GFP_KERNEL);
    + name = kmalloc(strlen(mistat->name), GFP_KERNEL);
    + extension = kmalloc(strlen(mistat->extension), GFP_KERNEL);
    +
    + 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));
    +
    + safe_cache_free(v9ses->slab, mistat);
    + safe_cache_free(v9ses->slab, 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 ? sb->s_fs_info : NULL;
    +
    + 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 && 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)
    +{
    + ino_t i = 0;
    +
    + if (sizeof(ino_t) == sizeof(qid->path))
    + memcpy(&i, &qid->path, sizeof(ino_t));
    + else {
    + /* there is no perfect solution for this case */
    + i = (ino_t) (qid->path ^ (qid->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 = kmem_cache_alloc(v9ses->slab, 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;
    + }
    +
    + /* need to update dcache so we show up */
    + safe_cache_free(v9ses->slab, fcall);
    + fcall = NULL;
    +
    + 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:
    + safe_cache_free(v9ses->slab, mistat);
    + safe_cache_free(v9ses->slab, 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 (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
    + retval = -EINVAL;
    + goto FreeFcall;
    + }
    +
    + if (retval < 0) {
    + dprintk(DEBUG_ERROR, "stat error\n");
    + 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:
    + safe_cache_free(v9ses->slab, 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 int 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 0;
    +}
    +
    +/**
    + * 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)
    +{
    + 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 super_block *sb = dir ? dir->i_sb : NULL;
    + struct v9fs_fcall *fcall = NULL;
    + struct v9fs_stat *mistat = kmem_cache_alloc(v9ses->slab, GFP_KERNEL);
    + struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP);
    + struct v9fs_fid *newfid = NULL;
    + char symname[255]; /* just going to store hardlinkfid(%x) */
    +
    + dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
    + old_dentry->d_name.name);
    +
    + if ((!dentry) || (!sb) || (!v9ses) || (!oldfid)) {
    + dprintk(DEBUG_ERROR, "problem with arguments\n");
    + return -EBADF;
    + }
    +
    + if (!v9ses->extended) {
    + dprintk(DEBUG_ERROR, "not extended\n");
    + goto FreeFcall;
    + }
    +
    + /* 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 FreeFcall;
    +
    + newfid = v9fs_fid_lookup(dentry, FID_OP);
    + if (!newfid) {
    + dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
    + goto FreeFcall;
    + }
    +
    + /* 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;
    + }
    +
    + /* need to update dcache so we show up */
    + safe_cache_free(v9ses->slab, fcall);
    + fcall = NULL;
    +
    + 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? */
    +
    + safe_cache_free(v9ses->slab, fcall);
    + fcall = NULL;
    +
    + FreeFcall:
    + safe_cache_free(v9ses->slab, mistat);
    + safe_cache_free(v9ses->slab, fcall);
    +
    + 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 super_block *sb = dir ? dir->i_sb : NULL;
    + struct v9fs_fcall *fcall = NULL;
    + struct v9fs_stat *mistat = kmem_cache_alloc(v9ses->slab, GFP_KERNEL);
    + char symname[255];
    +
    + 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))
    + return -EINVAL;
    +
    + 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, mode, 0);
    +
    + if (retval != 0)
    + goto FreeFcall;
    +
    + newfid = v9fs_fid_lookup(dentry, FID_OP);
    + if (!newfid) {
    + dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
    + retval = -EINVAL;
    + goto FreeFcall;
    + }
    +
    + /* 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 FreeFcall;
    + }
    +
    + 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 FreeFcall;
    + }
    +
    + safe_cache_free(v9ses->slab, fcall);
    + }
    +
    + /* need to update dcache so we show up */
    + safe_cache_free(v9ses->slab, 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:
    + safe_cache_free(v9ses->slab, mistat);
    + safe_cache_free(v9ses->slab, fcall);
    +
    + 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,
    +};
    -
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      Last update: 2005-05-24 00:42    [W:0.104 / U:31.156 seconds]
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