402 lines
9.0 KiB
C
402 lines
9.0 KiB
C
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/*
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* linux/fs/9p/vfs_file.c
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*
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* This file contians vfs file ops for 9P2000.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/smp_lock.h>
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#include <linux/inet.h>
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#include <linux/version.h>
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#include <linux/list.h>
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#include <asm/uaccess.h>
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#include <linux/idr.h>
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#include "debug.h"
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#include "v9fs.h"
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#include "9p.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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/**
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* v9fs_file_open - open a file (or directory)
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* @inode: inode to be opened
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* @file: file being opened
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*
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*/
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int v9fs_file_open(struct inode *inode, struct file *file)
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{
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struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
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struct v9fs_fid *v9fid = v9fs_fid_lookup(file->f_dentry, FID_WALK);
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struct v9fs_fid *v9newfid = NULL;
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struct v9fs_fcall *fcall = NULL;
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int open_mode = 0;
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unsigned int iounit = 0;
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int newfid = -1;
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long result = -1;
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dprintk(DEBUG_VFS, "inode: %p file: %p v9fid= %p\n", inode, file,
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v9fid);
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if (!v9fid) {
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struct dentry *dentry = file->f_dentry;
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dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n");
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/* XXX - some duplication from lookup, generalize later */
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/* basically vfs_lookup is too heavy weight */
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v9fid = v9fs_fid_lookup(file->f_dentry, FID_OP);
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if (!v9fid)
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return -EBADF;
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v9fid = v9fs_fid_lookup(dentry->d_parent, FID_WALK);
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if (!v9fid)
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return -EBADF;
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newfid = v9fs_get_idpool(&v9ses->fidpool);
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if (newfid < 0) {
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eprintk(KERN_WARNING, "newfid fails!\n");
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return -ENOSPC;
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}
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result =
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v9fs_t_walk(v9ses, v9fid->fid, newfid,
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(char *)file->f_dentry->d_name.name, NULL);
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if (result < 0) {
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v9fs_put_idpool(newfid, &v9ses->fidpool);
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dprintk(DEBUG_ERROR, "rewalk didn't work\n");
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return -EBADF;
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}
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v9fid = v9fs_fid_create(dentry);
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if (v9fid == NULL) {
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dprintk(DEBUG_ERROR, "couldn't insert\n");
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return -ENOMEM;
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}
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v9fid->fid = newfid;
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}
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if (v9fid->fidcreate) {
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/* create case */
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newfid = v9fid->fid;
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iounit = v9fid->iounit;
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v9fid->fidcreate = 0;
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} else {
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if (!S_ISDIR(inode->i_mode))
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newfid = v9fid->fid;
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else {
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newfid = v9fs_get_idpool(&v9ses->fidpool);
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if (newfid < 0) {
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eprintk(KERN_WARNING, "allocation failed\n");
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return -ENOSPC;
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}
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/* This would be a somewhat critical clone */
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result =
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v9fs_t_walk(v9ses, v9fid->fid, newfid, NULL,
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&fcall);
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if (result < 0) {
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dprintk(DEBUG_ERROR, "clone error: %s\n",
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FCALL_ERROR(fcall));
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kfree(fcall);
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return result;
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}
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v9newfid = v9fs_fid_create(file->f_dentry);
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v9newfid->fid = newfid;
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v9newfid->qid = v9fid->qid;
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v9newfid->iounit = v9fid->iounit;
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v9newfid->fidopen = 0;
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v9newfid->fidclunked = 0;
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v9newfid->v9ses = v9ses;
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v9fid = v9newfid;
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kfree(fcall);
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}
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/* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */
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/* translate open mode appropriately */
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open_mode = file->f_flags & 0x3;
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if (file->f_flags & O_EXCL)
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open_mode |= V9FS_OEXCL;
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if (v9ses->extended) {
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if (file->f_flags & O_TRUNC)
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open_mode |= V9FS_OTRUNC;
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if (file->f_flags & O_APPEND)
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open_mode |= V9FS_OAPPEND;
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}
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result = v9fs_t_open(v9ses, newfid, open_mode, &fcall);
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if (result < 0) {
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dprintk(DEBUG_ERROR,
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"open failed, open_mode 0x%x: %s\n", open_mode,
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FCALL_ERROR(fcall));
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kfree(fcall);
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return result;
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}
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iounit = fcall->params.ropen.iounit;
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kfree(fcall);
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}
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file->private_data = v9fid;
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v9fid->rdir_pos = 0;
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v9fid->rdir_fcall = NULL;
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v9fid->fidopen = 1;
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v9fid->filp = file;
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v9fid->iounit = iounit;
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return 0;
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}
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/**
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* v9fs_file_lock - lock a file (or directory)
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* @inode: inode to be opened
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* @file: file being opened
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*
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* XXX - this looks like a local only lock, we should extend into 9P
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* by using open exclusive
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*/
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static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
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{
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int res = 0;
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struct inode *inode = filp->f_dentry->d_inode;
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dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
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/* No mandatory locks */
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if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
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return -ENOLCK;
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if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
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filemap_fdatawrite(inode->i_mapping);
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filemap_fdatawait(inode->i_mapping);
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invalidate_inode_pages(&inode->i_data);
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}
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return res;
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}
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/**
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* v9fs_read - read from a file (internal)
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* @filep: file pointer to read
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* @data: data buffer to read data into
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* @count: size of buffer
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* @offset: offset at which to read data
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*
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*/
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static ssize_t
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v9fs_read(struct file *filp, char *buffer, size_t count, loff_t * offset)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
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struct v9fs_fid *v9f = filp->private_data;
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struct v9fs_fcall *fcall = NULL;
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int fid = v9f->fid;
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int rsize = 0;
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int result = 0;
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int total = 0;
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dprintk(DEBUG_VFS, "\n");
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rsize = v9ses->maxdata - V9FS_IOHDRSZ;
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if (v9f->iounit != 0 && rsize > v9f->iounit)
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rsize = v9f->iounit;
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do {
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if (count < rsize)
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rsize = count;
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result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
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if (result < 0) {
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printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n",
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result);
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kfree(fcall);
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return total;
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} else
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*offset += result;
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/* XXX - extra copy */
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memcpy(buffer, fcall->params.rread.data, result);
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count -= result;
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buffer += result;
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total += result;
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kfree(fcall);
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if (result < rsize)
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break;
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} while (count);
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return total;
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}
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/**
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* v9fs_file_read - read from a file
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* @filep: file pointer to read
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* @data: data buffer to read data into
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* @count: size of buffer
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* @offset: offset at which to read data
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*
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*/
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static ssize_t
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v9fs_file_read(struct file *filp, char __user * data, size_t count,
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loff_t * offset)
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{
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int retval = -1;
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int ret = 0;
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char *buffer;
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buffer = kmalloc(count, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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retval = v9fs_read(filp, buffer, count, offset);
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if (retval > 0) {
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if ((ret = copy_to_user(data, buffer, retval)) != 0) {
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dprintk(DEBUG_ERROR, "Problem copying to user %d\n",
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ret);
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retval = ret;
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}
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}
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kfree(buffer);
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return retval;
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}
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/**
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* v9fs_write - write to a file
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* @filep: file pointer to write
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* @data: data buffer to write data from
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* @count: size of buffer
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* @offset: offset at which to write data
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*
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*/
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static ssize_t
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v9fs_write(struct file *filp, char *buffer, size_t count, loff_t * offset)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
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struct v9fs_fid *v9fid = filp->private_data;
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struct v9fs_fcall *fcall;
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int fid = v9fid->fid;
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int result = -EIO;
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int rsize = 0;
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int total = 0;
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dprintk(DEBUG_VFS, "data %p count %d offset %x\n", buffer, (int)count,
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(int)*offset);
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rsize = v9ses->maxdata - V9FS_IOHDRSZ;
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if (v9fid->iounit != 0 && rsize > v9fid->iounit)
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rsize = v9fid->iounit;
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dump_data(buffer, count);
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do {
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if (count < rsize)
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rsize = count;
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result =
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v9fs_t_write(v9ses, fid, *offset, rsize, buffer, &fcall);
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if (result < 0) {
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eprintk(KERN_ERR, "error while writing: %s(%d)\n",
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FCALL_ERROR(fcall), result);
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kfree(fcall);
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return result;
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} else
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*offset += result;
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kfree(fcall);
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if (result != rsize) {
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eprintk(KERN_ERR,
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"short write: v9fs_t_write returned %d\n",
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result);
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break;
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}
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count -= result;
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buffer += result;
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total += result;
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} while (count);
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return total;
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}
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/**
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* v9fs_file_write - write to a file
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* @filep: file pointer to write
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* @data: data buffer to write data from
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* @count: size of buffer
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* @offset: offset at which to write data
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*
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*/
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static ssize_t
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v9fs_file_write(struct file *filp, const char __user * data,
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size_t count, loff_t * offset)
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{
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int ret = -1;
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char *buffer;
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buffer = kmalloc(count, GFP_KERNEL);
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|
|
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,
|
||
|
|
};
|