linux/sharedfolders/regops.c

	regops.c revision c97989161fbe75bc14cea477a5443bbf474dd3ad
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync/** @file
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync *
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * vboxvfs -- VirtualBox Guest Additions for Linux:
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * Regular file inode and file operations
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync */
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync/*
c97989161fbe75bc14cea477a5443bbf474dd3advboxsync * Copyright (C) 2006-2007 innotek GmbH
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync *
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * available from http://www.virtualbox.org. This file is free software;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * you can redistribute it and/or modify it under the terms of the GNU
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * General Public License as published by the Free Software Foundation,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * distribution. VirtualBox OSE is distributed in the hope that it will
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * be useful, but WITHOUT ANY WARRANTY of any kind.
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync *
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * If you received this file as part of a commercial VirtualBox
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * distribution, then only the terms of your commercial VirtualBox
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * license agreement apply instead of the previous paragraph.
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync */
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync/*
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync * Limitations: only COW memory mapping is supported
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync */
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#define CHUNK_SIZE 4096
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync/* fops */
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic int
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncsf_reg_read_aux (const char *caller, struct sf_glob_info *sf_g,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                 struct sf_reg_info *sf_r, void *buf, uint32_t *nread,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                 uint64_t pos)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync{
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        int rc = vboxCallRead (&client_handle, &sf_g->map, sf_r->handle,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                               pos, nread, buf);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (VBOX_FAILURE (rc)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog3 ("%s: %s: vboxCallRead failed rc=%d\n",
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                       caller, __func__, rc);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return -EPROTO;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync}
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic ssize_t
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncsf_reg_read (struct file *file, char *buf, size_t size, loff_t *off)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync{
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        int err;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        void *tmp;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        size_t left = size;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        ssize_t total_bytes_read = 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct inode *inode = file->f_dentry->d_inode;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_glob_info *sf_g = GET_GLOB_INFO (inode->i_sb);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_reg_info *sf_r = file->private_data;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        loff_t pos = *off;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        TRACE ();
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!S_ISREG (inode->i_mode)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog ("read from non regular file %d\n", inode->i_mode);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return -EINVAL;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!size) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        tmp = kmalloc (CHUNK_SIZE, GFP_KERNEL);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!tmp) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog ("could not allocate bounce buffer memory %u bytes\n",
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                      CHUNK_SIZE);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return -ENOMEM;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        while (left) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                uint32_t to_read, nread;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                to_read = CHUNK_SIZE;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (to_read > left) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        to_read = (uint32_t) left;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                nread = to_read;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                err = sf_reg_read_aux (__func__, sf_g, sf_r, tmp, &nread, pos);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (err) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        goto fail;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (copy_to_user (buf, tmp, nread)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        err = -EFAULT;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        goto fail;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                pos += nread;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                left -= nread;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                buf += nread;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                total_bytes_read += nread;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (nread != to_read) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        break;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        *off += total_bytes_read;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        kfree (tmp);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return total_bytes_read;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync fail:
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        kfree (tmp);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return err;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync}
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic ssize_t
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncsf_reg_write (struct file *file, const char *buf, size_t size, loff_t *off)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync{
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        int err;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        void *tmp;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        size_t left = size;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        ssize_t total_bytes_written = 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct inode *inode = file->f_dentry->d_inode;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_inode_info *sf_i = GET_INODE_INFO (inode);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_glob_info *sf_g = GET_GLOB_INFO (inode->i_sb);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_reg_info *sf_r = file->private_data;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        loff_t pos = *off;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        TRACE ();
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        BUG_ON (!sf_i);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        BUG_ON (!sf_g);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        BUG_ON (!sf_r);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!S_ISREG (inode->i_mode)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog ("write to non regular file %d\n",  inode->i_mode);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return -EINVAL;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!size) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        tmp = kmalloc (CHUNK_SIZE, GFP_KERNEL);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!tmp) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog ("could not allocate bounce buffer memory %u bytes\n",
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                      CHUNK_SIZE);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return -ENOMEM;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        while (left) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                int rc;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                uint32_t to_write, nwritten;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                to_write = CHUNK_SIZE;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (to_write > left) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        to_write = (uint32_t) left;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                nwritten = to_write;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (copy_from_user (tmp, buf, to_write)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        err = -EFAULT;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        goto fail;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                rc = vboxCallWrite (&client_handle, &sf_g->map, sf_r->handle,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                    pos, &nwritten, tmp);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (VBOX_FAILURE (rc)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        err = -EPROTO;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        elog ("vboxCallWrite(%s) failed rc=%d\n",
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                              sf_i->path->String.utf8, rc);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        goto fail;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                pos += nwritten;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                left -= nwritten;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                buf += nwritten;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                total_bytes_written += nwritten;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (nwritten != to_write) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        break;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#if 1                           /* XXX: which way is correct? */
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        *off += total_bytes_written;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#else
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        file->f_pos += total_bytes_written;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#endif
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        sf_i->force_restat = 1;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        kfree (tmp);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return total_bytes_written;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync fail:
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        kfree (tmp);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return err;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync}
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic int
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncsf_reg_open (struct inode *inode, struct file *file)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync{
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        int rc;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_glob_info *sf_g = GET_GLOB_INFO (inode->i_sb);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_inode_info *sf_i = GET_INODE_INFO (inode);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_reg_info *sf_r;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        SHFLCREATEPARMS params;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        TRACE ();
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        BUG_ON (!sf_g);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        BUG_ON (!sf_i);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        sf_r = kmalloc (sizeof (*sf_r), GFP_KERNEL);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!sf_r) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog2 ("could not allocate reg info\n");
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return -ENOMEM;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#if 0
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        printk ("open %s\n", sf_i->path->String.utf8);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#endif
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        params.CreateFlags = 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        params.Info.cbObject = 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (file->f_flags & O_CREAT) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (file->f_flags & O_EXCL) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        params.CreateFlags |= SHFL_CF_ACCESS_READWRITE;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        params.CreateFlags |= SHFL_CF_ACT_FAIL_IF_EXISTS;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                else {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        params.CreateFlags |= SHFL_CF_ACT_CREATE_IF_NEW;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        params.CreateFlags |= SHFL_CF_ACCESS_READWRITE;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        if (file->f_flags & O_TRUNC) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                params.CreateFlags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        else {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                params.CreateFlags |= SHFL_CF_ACT_OPEN_IF_EXISTS;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        else {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                if (file->f_flags & O_TRUNC) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        params.CreateFlags |= SHFL_CF_ACCESS_READWRITE;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        params.CreateFlags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                else {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        params.CreateFlags |= SHFL_CF_ACT_FAIL_IF_NEW;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!(params.CreateFlags & SHFL_CF_ACCESS_READWRITE)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                switch (file->f_flags & O_ACCMODE) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        case O_RDONLY:
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                params.CreateFlags |= SHFL_CF_ACCESS_READ;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                break;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        case O_WRONLY:
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                params.CreateFlags |= SHFL_CF_ACCESS_WRITE;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                break;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        case O_RDWR:
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                params.CreateFlags |= SHFL_CF_ACCESS_READWRITE;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                break;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                        default:
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                                BUG ();
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        rc = vboxCallCreate (&client_handle, &sf_g->map, sf_i->path, &params);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        /* XXX: here i probably should check rc and convert some values to
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync           EEXISTS ENOENT etc */
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (VBOX_FAILURE (rc)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog ("vboxCallCreate failed flags=%d,%#x rc=%d\n",
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                      file->f_flags, params.CreateFlags, rc);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                kfree (sf_r);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return -EPROTO;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        sf_i->force_restat = 1;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        sf_r->handle = params.Handle;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        file->private_data = sf_r;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync}
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic int
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncsf_reg_release (struct inode *inode, struct file *file)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync{
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        int rc;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_reg_info *sf_r;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_glob_info *sf_g;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        TRACE ();
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        sf_g = GET_GLOB_INFO (inode->i_sb);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        sf_r = file->private_data;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        BUG_ON (!sf_g);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        BUG_ON (!sf_r);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        rc = vboxCallClose (&client_handle, &sf_g->map, sf_r->handle);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (VBOX_FAILURE (rc)) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog ("vboxCallClose failed rc=%d\n", rc);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        kfree (sf_r);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        file->private_data = NULL;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync}
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic struct page *
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 0)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncsf_reg_nopage (struct vm_area_struct *vma, unsigned long vaddr, int unused)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#define SET_TYPE(t)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#else
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncsf_reg_nopage (struct vm_area_struct *vma, unsigned long vaddr, int *type)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#define SET_TYPE(t) *type = (t)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#endif
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync{
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct page *page;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        char *buf;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        loff_t off;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        uint32_t nread = PAGE_SIZE;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        int err;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct file *file = vma->vm_file;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct inode *inode = file->f_dentry->d_inode;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_glob_info *sf_g = GET_GLOB_INFO (inode->i_sb);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        struct sf_reg_info *sf_r = file->private_data;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        TRACE ();
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (vaddr > vma->vm_end) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                SET_TYPE (VM_FAULT_SIGBUS);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return NOPAGE_SIGBUS;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        page = alloc_page (GFP_HIGHUSER);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!page) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog2 ("failed to allocate page\n");
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                SET_TYPE (VM_FAULT_OOM);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return NOPAGE_OOM;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        buf = kmap (page);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        off = (vaddr - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        err = sf_reg_read_aux (__func__, sf_g, sf_r, buf, &nread, off);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (err) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                kunmap (page);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                put_page (page);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                SET_TYPE (VM_FAULT_SIGBUS);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return NOPAGE_SIGBUS;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        BUG_ON (nread > PAGE_SIZE);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (!nread) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 0)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                clear_user_page (page_address (page), vaddr);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#else
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                clear_user_page (page_address (page), vaddr, page);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#endif
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        else {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                memset (buf + nread, 0, PAGE_SIZE - nread);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        flush_dcache_page (page);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        kunmap (page);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        SET_TYPE (VM_FAULT_MAJOR);
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return page;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync}
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic struct vm_operations_struct sf_vma_ops = {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        .nopage = sf_reg_nopage
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync};
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic int
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncsf_reg_mmap (struct file *file, struct vm_area_struct *vma)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync{
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        TRACE ();
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        if (vma->vm_flags & VM_SHARED) {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                elog2 ("shared mmapping not available\n");
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync                return -EINVAL;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        }
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        vma->vm_ops = &sf_vma_ops;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        return 0;
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync}
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic struct file_operations sf_reg_fops = {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        .read    = sf_reg_read,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        .open    = sf_reg_open,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        .write   = sf_reg_write,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        .release = sf_reg_release,
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        .mmap    = sf_reg_mmap
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync};
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync/* iops */
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync
13fdd42f1fc3e519650037a920e6a54c24973866vboxsyncstatic struct inode_operations sf_reg_iops = {
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#if LINUX_VERSION_CODE < KERNEL_VERSION (2, 6, 0)
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        .revalidate = sf_inode_revalidate
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#else
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync        .getattr    = sf_getattr
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync#endif
13fdd42f1fc3e519650037a920e6a54c24973866vboxsync};