[PATCH] v9fs: VFS file, dentry, and directory operations
This part of the patch contains the VFS file, dentry & directory 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>
This commit is contained in:
Eric Van Hensbergen
Linus Torvalds
Родитель
93fa58cb83
Коммит
e69e7fe5b0
|
|
@ -0,0 +1,126 @@
|
|||
/*
|
||||
* linux/fs/9p/vfs_dentry.c
|
||||
*
|
||||
* This file contians vfs dentry 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"
|
||||
|
||||
/**
|
||||
* 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_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 = dentry->d_fsdata;
|
||||
struct v9fs_fid *temp = NULL;
|
||||
struct v9fs_fid *current_fid = NULL;
|
||||
struct v9fs_fcall *fcall = NULL;
|
||||
|
||||
list_for_each_entry_safe(current_fid, temp, fid_list, 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,
|
||||
¤t_fid->v9ses->fidpool);
|
||||
|
||||
kfree(fcall);
|
||||
v9fs_fid_destroy(current_fid);
|
||||
}
|
||||
|
||||
kfree(dentry->d_fsdata); /* free the list_head */
|
||||
}
|
||||
}
|
||||
|
||||
struct dentry_operations v9fs_dentry_operations = {
|
||||
.d_revalidate = v9fs_dentry_validate,
|
||||
.d_release = v9fs_dentry_release,
|
||||
};
|
||||
|
|
@ -0,0 +1,226 @@
|
|||
/*
|
||||
* 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 "v9fs_vfs.h"
|
||||
#include "conv.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;
|
||||
int fid = -1;
|
||||
int ret = 0;
|
||||
struct v9fs_stat *mi = NULL;
|
||||
int over = 0;
|
||||
|
||||
dprintk(DEBUG_VFS, "name %s\n", filp->f_dentry->d_name.name);
|
||||
|
||||
fid = file->fid;
|
||||
|
||||
mi = kmalloc(v9ses->maxdata, GFP_KERNEL);
|
||||
if (!mi)
|
||||
return -ENOMEM;
|
||||
|
||||
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) {
|
||||
int s = v9fs_deserialize_stat(v9ses,
|
||||
file->rdir_fcall->params.rread.data + i,
|
||||
n - i, mi, v9ses->maxdata);
|
||||
|
||||
if (s == 0) {
|
||||
dprintk(DEBUG_ERROR,
|
||||
"error while deserializing mistat\n");
|
||||
ret = -EIO;
|
||||
goto FreeStructs;
|
||||
}
|
||||
|
||||
over = filldir(dirent, mi->name, strlen(mi->name),
|
||||
filp->f_pos, v9fs_qid2ino(&mi->qid),
|
||||
dt_type(mi));
|
||||
|
||||
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) {
|
||||
int s = v9fs_deserialize_stat(v9ses,
|
||||
fcall->params.rread.data + i, n - i, mi,
|
||||
v9ses->maxdata);
|
||||
|
||||
if (s == 0) {
|
||||
dprintk(DEBUG_ERROR,
|
||||
"error while deserializing mistat\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
over = filldir(dirent, mi->name, strlen(mi->name),
|
||||
filp->f_pos, v9fs_qid2ino(&mi->qid),
|
||||
dt_type(mi));
|
||||
|
||||
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);
|
||||
kfree(mi);
|
||||
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_fdatawrite(inode->i_mapping);
|
||||
filemap_fdatawait(inode->i_mapping);
|
||||
|
||||
if (fidnum >= 0) {
|
||||
fid->fidopen--;
|
||||
dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
|
||||
fid->fid);
|
||||
|
||||
if (fid->fidopen == 0) {
|
||||
if (v9fs_t_clunk(v9ses, fidnum, NULL))
|
||||
dprintk(DEBUG_ERROR, "clunk failed\n");
|
||||
|
||||
v9fs_put_idpool(fid->fid, &v9ses->fidpool);
|
||||
}
|
||||
|
||||
kfree(fid->rdir_fcall);
|
||||
|
||||
filp->private_data = NULL;
|
||||
v9fs_fid_destroy(fid);
|
||||
}
|
||||
|
||||
d_drop(filp->f_dentry);
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct file_operations v9fs_dir_operations = {
|
||||
.read = generic_read_dir,
|
||||
.readdir = v9fs_dir_readdir,
|
||||
.open = v9fs_file_open,
|
||||
.release = v9fs_dir_release,
|
||||
};
|
||||
|
|
@ -0,0 +1,401 @@
|
|||
/*
|
||||
* linux/fs/9p/vfs_file.c
|
||||
*
|
||||
* This file contians vfs file ops for 9P2000.
|
||||
*
|
||||
* 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/version.h>
|
||||
#include <linux/list.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <linux/idr.h>
|
||||
|
||||
#include "debug.h"
|
||||
#include "v9fs.h"
|
||||
#include "9p.h"
|
||||
#include "v9fs_vfs.h"
|
||||
#include "fid.h"
|
||||
|
||||
/**
|
||||
* v9fs_file_open - open a file (or directory)
|
||||
* @inode: inode to be opened
|
||||
* @file: file being opened
|
||||
*
|
||||
*/
|
||||
|
||||
int v9fs_file_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
|
||||
struct v9fs_fid *v9fid = v9fs_fid_lookup(file->f_dentry, FID_WALK);
|
||||
struct v9fs_fid *v9newfid = NULL;
|
||||
struct v9fs_fcall *fcall = NULL;
|
||||
int open_mode = 0;
|
||||
unsigned int iounit = 0;
|
||||
int newfid = -1;
|
||||
long result = -1;
|
||||
|
||||
dprintk(DEBUG_VFS, "inode: %p file: %p v9fid= %p\n", inode, file,
|
||||
v9fid);
|
||||
|
||||
if (!v9fid) {
|
||||
struct dentry *dentry = file->f_dentry;
|
||||
dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n");
|
||||
|
||||
/* XXX - some duplication from lookup, generalize later */
|
||||
/* basically vfs_lookup is too heavy weight */
|
||||
v9fid = v9fs_fid_lookup(file->f_dentry, FID_OP);
|
||||
if (!v9fid)
|
||||
return -EBADF;
|
||||
|
||||
v9fid = v9fs_fid_lookup(dentry->d_parent, FID_WALK);
|
||||
if (!v9fid)
|
||||
return -EBADF;
|
||||
|
||||
newfid = v9fs_get_idpool(&v9ses->fidpool);
|
||||
if (newfid < 0) {
|
||||
eprintk(KERN_WARNING, "newfid fails!\n");
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
result =
|
||||
v9fs_t_walk(v9ses, v9fid->fid, newfid,
|
||||
(char *)file->f_dentry->d_name.name, NULL);
|
||||
if (result < 0) {
|
||||
v9fs_put_idpool(newfid, &v9ses->fidpool);
|
||||
dprintk(DEBUG_ERROR, "rewalk didn't work\n");
|
||||
return -EBADF;
|
||||
}
|
||||
|
||||
v9fid = v9fs_fid_create(dentry);
|
||||
if (v9fid == NULL) {
|
||||
dprintk(DEBUG_ERROR, "couldn't insert\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
v9fid->fid = newfid;
|
||||
}
|
||||
|
||||
if (v9fid->fidcreate) {
|
||||
/* create case */
|
||||
newfid = v9fid->fid;
|
||||
iounit = v9fid->iounit;
|
||||
v9fid->fidcreate = 0;
|
||||
} else {
|
||||
if (!S_ISDIR(inode->i_mode))
|
||||
newfid = v9fid->fid;
|
||||
else {
|
||||
newfid = v9fs_get_idpool(&v9ses->fidpool);
|
||||
if (newfid < 0) {
|
||||
eprintk(KERN_WARNING, "allocation failed\n");
|
||||
return -ENOSPC;
|
||||
}
|
||||
/* This would be a somewhat critical clone */
|
||||
result =
|
||||
v9fs_t_walk(v9ses, v9fid->fid, newfid, NULL,
|
||||
&fcall);
|
||||
if (result < 0) {
|
||||
dprintk(DEBUG_ERROR, "clone error: %s\n",
|
||||
FCALL_ERROR(fcall));
|
||||
kfree(fcall);
|
||||
return result;
|
||||
}
|
||||
|
||||
v9newfid = v9fs_fid_create(file->f_dentry);
|
||||
v9newfid->fid = newfid;
|
||||
v9newfid->qid = v9fid->qid;
|
||||
v9newfid->iounit = v9fid->iounit;
|
||||
v9newfid->fidopen = 0;
|
||||
v9newfid->fidclunked = 0;
|
||||
v9newfid->v9ses = v9ses;
|
||||
v9fid = v9newfid;
|
||||
kfree(fcall);
|
||||
}
|
||||
|
||||
/* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
|
||||
/* translate open mode appropriately */
|
||||
open_mode = file->f_flags & 0x3;
|
||||
|
||||
if (file->f_flags & O_EXCL)
|
||||
open_mode |= V9FS_OEXCL;
|
||||
|
||||
if (v9ses->extended) {
|
||||
if (file->f_flags & O_TRUNC)
|
||||
open_mode |= V9FS_OTRUNC;
|
||||
|
||||
if (file->f_flags & O_APPEND)
|
||||
open_mode |= V9FS_OAPPEND;
|
||||
}
|
||||
|
||||
result = v9fs_t_open(v9ses, newfid, open_mode, &fcall);
|
||||
if (result < 0) {
|
||||
dprintk(DEBUG_ERROR,
|
||||
"open failed, open_mode 0x%x: %s\n", open_mode,
|
||||
FCALL_ERROR(fcall));
|
||||
kfree(fcall);
|
||||
return result;
|
||||
}
|
||||
|
||||
iounit = fcall->params.ropen.iounit;
|
||||
kfree(fcall);
|
||||
}
|
||||
|
||||
|
||||
file->private_data = v9fid;
|
||||
|
||||
v9fid->rdir_pos = 0;
|
||||
v9fid->rdir_fcall = NULL;
|
||||
v9fid->fidopen = 1;
|
||||
v9fid->filp = file;
|
||||
v9fid->iounit = iounit;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_file_lock - lock a file (or directory)
|
||||
* @inode: inode to be opened
|
||||
* @file: file being opened
|
||||
*
|
||||
* XXX - this looks like a local only lock, we should extend into 9P
|
||||
* by using open exclusive
|
||||
*/
|
||||
|
||||
static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
|
||||
{
|
||||
int res = 0;
|
||||
struct inode *inode = filp->f_dentry->d_inode;
|
||||
|
||||
dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
|
||||
|
||||
/* No mandatory locks */
|
||||
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
|
||||
return -ENOLCK;
|
||||
|
||||
if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
|
||||
filemap_fdatawrite(inode->i_mapping);
|
||||
filemap_fdatawait(inode->i_mapping);
|
||||
invalidate_inode_pages(&inode->i_data);
|
||||
}
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_read - read from a file (internal)
|
||||
* @filep: file pointer to read
|
||||
* @data: data buffer to read data into
|
||||
* @count: size of buffer
|
||||
* @offset: offset at which to read data
|
||||
*
|
||||
*/
|
||||
|
||||
static ssize_t
|
||||
v9fs_read(struct file *filp, char *buffer, size_t count, loff_t * offset)
|
||||
{
|
||||
struct inode *inode = filp->f_dentry->d_inode;
|
||||
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
|
||||
struct v9fs_fid *v9f = filp->private_data;
|
||||
struct v9fs_fcall *fcall = NULL;
|
||||
int fid = v9f->fid;
|
||||
int rsize = 0;
|
||||
int result = 0;
|
||||
int total = 0;
|
||||
|
||||
dprintk(DEBUG_VFS, "\n");
|
||||
|
||||
rsize = v9ses->maxdata - V9FS_IOHDRSZ;
|
||||
if (v9f->iounit != 0 && rsize > v9f->iounit)
|
||||
rsize = v9f->iounit;
|
||||
|
||||
do {
|
||||
if (count < rsize)
|
||||
rsize = count;
|
||||
|
||||
result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
|
||||
|
||||
if (result < 0) {
|
||||
printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n",
|
||||
result);
|
||||
|
||||
kfree(fcall);
|
||||
return total;
|
||||
} else
|
||||
*offset += result;
|
||||
|
||||
/* XXX - extra copy */
|
||||
memcpy(buffer, fcall->params.rread.data, result);
|
||||
count -= result;
|
||||
buffer += result;
|
||||
total += result;
|
||||
|
||||
kfree(fcall);
|
||||
|
||||
if (result < rsize)
|
||||
break;
|
||||
} while (count);
|
||||
|
||||
return total;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_file_read - read from a file
|
||||
* @filep: file pointer to read
|
||||
* @data: data buffer to read data into
|
||||
* @count: size of buffer
|
||||
* @offset: offset at which to read data
|
||||
*
|
||||
*/
|
||||
|
||||
static ssize_t
|
||||
v9fs_file_read(struct file *filp, char __user * data, size_t count,
|
||||
loff_t * offset)
|
||||
{
|
||||
int retval = -1;
|
||||
int ret = 0;
|
||||
char *buffer;
|
||||
|
||||
buffer = kmalloc(count, GFP_KERNEL);
|
||||
if (!buffer)
|
||||
return -ENOMEM;
|
||||
|
||||
retval = v9fs_read(filp, buffer, count, offset);
|
||||
if (retval > 0) {
|
||||
if ((ret = copy_to_user(data, buffer, retval)) != 0) {
|
||||
dprintk(DEBUG_ERROR, "Problem copying to user %d\n",
|
||||
ret);
|
||||
retval = ret;
|
||||
}
|
||||
}
|
||||
|
||||
kfree(buffer);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_write - write to a file
|
||||
* @filep: file pointer to write
|
||||
* @data: data buffer to write data from
|
||||
* @count: size of buffer
|
||||
* @offset: offset at which to write data
|
||||
*
|
||||
*/
|
||||
|
||||
static ssize_t
|
||||
v9fs_write(struct file *filp, char *buffer, size_t count, loff_t * offset)
|
||||
{
|
||||
struct inode *inode = filp->f_dentry->d_inode;
|
||||
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
|
||||
struct v9fs_fid *v9fid = filp->private_data;
|
||||
struct v9fs_fcall *fcall;
|
||||
int fid = v9fid->fid;
|
||||
int result = -EIO;
|
||||
int rsize = 0;
|
||||
int total = 0;
|
||||
|
||||
dprintk(DEBUG_VFS, "data %p count %d offset %x\n", buffer, (int)count,
|
||||
(int)*offset);
|
||||
rsize = v9ses->maxdata - V9FS_IOHDRSZ;
|
||||
if (v9fid->iounit != 0 && rsize > v9fid->iounit)
|
||||
rsize = v9fid->iounit;
|
||||
|
||||
dump_data(buffer, count);
|
||||
|
||||
do {
|
||||
if (count < rsize)
|
||||
rsize = count;
|
||||
|
||||
result =
|
||||
v9fs_t_write(v9ses, fid, *offset, rsize, buffer, &fcall);
|
||||
if (result < 0) {
|
||||
eprintk(KERN_ERR, "error while writing: %s(%d)\n",
|
||||
FCALL_ERROR(fcall), result);
|
||||
kfree(fcall);
|
||||
return result;
|
||||
} else
|
||||
*offset += result;
|
||||
|
||||
kfree(fcall);
|
||||
|
||||
if (result != rsize) {
|
||||
eprintk(KERN_ERR,
|
||||
"short write: v9fs_t_write returned %d\n",
|
||||
result);
|
||||
break;
|
||||
}
|
||||
|
||||
count -= result;
|
||||
buffer += result;
|
||||
total += result;
|
||||
} while (count);
|
||||
|
||||
return total;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_file_write - write to a file
|
||||
* @filep: file pointer to write
|
||||
* @data: data buffer to write data from
|
||||
* @count: size of buffer
|
||||
* @offset: offset at which to write data
|
||||
*
|
||||
*/
|
||||
|
||||
static ssize_t
|
||||
v9fs_file_write(struct file *filp, const char __user * data,
|
||||
size_t count, loff_t * offset)
|
||||
{
|
||||
int ret = -1;
|
||||
char *buffer;
|
||||
|
||||
buffer = kmalloc(count, GFP_KERNEL);
|
||||
if (buffer == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = copy_from_user(buffer, data, count);
|
||||
if (ret) {
|
||||
dprintk(DEBUG_ERROR, "Problem copying from user\n");
|
||||
ret = -EFAULT;
|
||||
} else {
|
||||
ret = v9fs_write(filp, buffer, count, offset);
|
||||
}
|
||||
|
||||
kfree(buffer);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
struct file_operations v9fs_file_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = v9fs_file_read,
|
||||
.write = v9fs_file_write,
|
||||
.open = v9fs_file_open,
|
||||
.release = v9fs_dir_release,
|
||||
.lock = v9fs_file_lock,
|
||||
};
|
||||
Загрузка…
Ссылка в новой задаче