![Eric Van Hensbergen](/assets/img/avatar_default.png)
There is a d_drop in dir_release which caused problems as it invalidates dcache entries too soon. This was likely a part of the wierd cwd behavior folks were seeing. 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>
214 lines
4.7 KiB
C
214 lines
4.7 KiB
C
/*
|
|
* linux/fs/9p/vfs_dir.c
|
|
*
|
|
* This file contains vfs directory 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/stat.h>
|
|
#include <linux/string.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/idr.h>
|
|
|
|
#include "debug.h"
|
|
#include "v9fs.h"
|
|
#include "9p.h"
|
|
#include "conv.h"
|
|
#include "v9fs_vfs.h"
|
|
#include "fid.h"
|
|
|
|
/**
|
|
* dt_type - return file type
|
|
* @mistat: mistat structure
|
|
*
|
|
*/
|
|
|
|
static inline int dt_type(struct v9fs_stat *mistat)
|
|
{
|
|
unsigned long perm = mistat->mode;
|
|
int rettype = DT_REG;
|
|
|
|
if (perm & V9FS_DMDIR)
|
|
rettype = DT_DIR;
|
|
if (perm & V9FS_DMSYMLINK)
|
|
rettype = DT_LNK;
|
|
|
|
return rettype;
|
|
}
|
|
|
|
/**
|
|
* v9fs_dir_readdir - read a directory
|
|
* @filep: opened file structure
|
|
* @dirent: directory structure ???
|
|
* @filldir: function to populate directory structure ???
|
|
*
|
|
*/
|
|
|
|
static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|
{
|
|
struct v9fs_fcall *fcall = NULL;
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
|
|
struct v9fs_fid *file = filp->private_data;
|
|
unsigned int i, n, s;
|
|
int fid = -1;
|
|
int ret = 0;
|
|
struct v9fs_stat stat;
|
|
int over = 0;
|
|
|
|
dprintk(DEBUG_VFS, "name %s\n", filp->f_dentry->d_name.name);
|
|
|
|
fid = file->fid;
|
|
|
|
if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) {
|
|
kfree(file->rdir_fcall);
|
|
file->rdir_fcall = NULL;
|
|
}
|
|
|
|
if (file->rdir_fcall) {
|
|
n = file->rdir_fcall->params.rread.count;
|
|
i = file->rdir_fpos;
|
|
while (i < n) {
|
|
s = v9fs_deserialize_stat(
|
|
file->rdir_fcall->params.rread.data + i,
|
|
n - i, &stat, v9ses->extended);
|
|
|
|
if (s == 0) {
|
|
dprintk(DEBUG_ERROR,
|
|
"error while deserializing stat\n");
|
|
ret = -EIO;
|
|
goto FreeStructs;
|
|
}
|
|
|
|
over = filldir(dirent, stat.name.str, stat.name.len,
|
|
filp->f_pos, v9fs_qid2ino(&stat.qid),
|
|
dt_type(&stat));
|
|
|
|
if (over) {
|
|
file->rdir_fpos = i;
|
|
file->rdir_pos = filp->f_pos;
|
|
break;
|
|
}
|
|
|
|
i += s;
|
|
filp->f_pos += s;
|
|
}
|
|
|
|
if (!over) {
|
|
kfree(file->rdir_fcall);
|
|
file->rdir_fcall = NULL;
|
|
}
|
|
}
|
|
|
|
while (!over) {
|
|
ret = v9fs_t_read(v9ses, fid, filp->f_pos,
|
|
v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
|
|
if (ret < 0) {
|
|
dprintk(DEBUG_ERROR, "error while reading: %d: %p\n",
|
|
ret, fcall);
|
|
goto FreeStructs;
|
|
} else if (ret == 0)
|
|
break;
|
|
|
|
n = ret;
|
|
i = 0;
|
|
while (i < n) {
|
|
s = v9fs_deserialize_stat(fcall->params.rread.data + i,
|
|
n - i, &stat, v9ses->extended);
|
|
|
|
if (s == 0) {
|
|
dprintk(DEBUG_ERROR,
|
|
"error while deserializing stat\n");
|
|
return -EIO;
|
|
}
|
|
|
|
over = filldir(dirent, stat.name.str, stat.name.len,
|
|
filp->f_pos, v9fs_qid2ino(&stat.qid),
|
|
dt_type(&stat));
|
|
|
|
if (over) {
|
|
file->rdir_fcall = fcall;
|
|
file->rdir_fpos = i;
|
|
file->rdir_pos = filp->f_pos;
|
|
fcall = NULL;
|
|
break;
|
|
}
|
|
|
|
i += s;
|
|
filp->f_pos += s;
|
|
}
|
|
|
|
kfree(fcall);
|
|
}
|
|
|
|
FreeStructs:
|
|
kfree(fcall);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* v9fs_dir_release - close a directory
|
|
* @inode: inode of the directory
|
|
* @filp: file pointer to a directory
|
|
*
|
|
*/
|
|
|
|
int v9fs_dir_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
|
|
struct v9fs_fid *fid = filp->private_data;
|
|
int fidnum = -1;
|
|
|
|
dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp,
|
|
fid->fid);
|
|
fidnum = fid->fid;
|
|
|
|
filemap_write_and_wait(inode->i_mapping);
|
|
|
|
if (fidnum >= 0) {
|
|
dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
|
|
fid->fid);
|
|
|
|
if (v9fs_t_clunk(v9ses, fidnum))
|
|
dprintk(DEBUG_ERROR, "clunk failed\n");
|
|
|
|
kfree(fid->rdir_fcall);
|
|
kfree(fid);
|
|
|
|
filp->private_data = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct file_operations v9fs_dir_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = v9fs_dir_readdir,
|
|
.open = v9fs_file_open,
|
|
.release = v9fs_dir_release,
|
|
};
|