int android_readwrite_file(const char *filename, char *rbuf,
const char *wbuf, size_t length)
{
int ret = 0;
struct file *filp = (struct file *)-ENOENT;
mm_segment_t oldfs;
oldfs = get_fs();
set_fs(KERNEL_DS);
do {
int mode = (wbuf) ? O_RDWR : O_RDONLY;
filp = filp_open(filename, mode, S_IRUSR);
if (IS_ERR(filp) || !filp->f_op) {
ret = -ENOENT;
break;
}
if (length == 0) {
/* Read the length of the file only */
struct inode *inode;
inode = GET_INODE_FROM_FILEP(filp);
if (!inode) {
printk(KERN_ERR
"android_readwrite_file: Error 2\n");
ret = -ENOENT;
break;
}
ret = i_size_read(inode->i_mapping->host);
break;
}
if (wbuf) {
ret = filp->f_op->write(
filp, wbuf, length, &filp->f_pos);
if (ret < 0) {
printk(KERN_ERR
"android_readwrite_file: Error 3\n");
break;
}
} else {
ret = filp->f_op->read(
filp, rbuf, length, &filp->f_pos);
if (ret < 0) {
printk(KERN_ERR
"android_readwrite_file: Error 4\n");
break;
}
}
} while (0);
if (!IS_ERR(filp))
filp_close(filp, NULL);
set_fs(oldfs);
printk(KERN_ERR "android_readwrite_file: ret=%d\n", ret);
return ret;
}
static int android_readwrite_file(const A_CHAR *filename, A_CHAR *rbuf, const A_CHAR *wbuf, size_t length)
{
int ret = 0;
struct file *filp = (struct file *)-ENOENT;
mm_segment_t oldfs;
oldfs = get_fs();
set_fs(KERNEL_DS);
do {
int mode = (wbuf) ? O_RDWR : O_RDONLY;
filp = filp_open(filename, mode, S_IRUSR);
if (IS_ERR(filp) || !filp->f_op) {
AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("%s: file %s filp_open error\n", __FUNCTION__, filename));
ret = -ENOENT;
break;
}
if (length==0) {
/* Read the length of the file only */
struct inode *inode;
inode = GET_INODE_FROM_FILEP(filp);
if (!inode) {
AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("%s: Get inode from %s failed\n", __FUNCTION__, filename));
ret = -ENOENT;
break;
}
ret = i_size_read(inode->i_mapping->host);
break;
}
if (wbuf) {
if ( (ret=filp->f_op->write(filp, wbuf, length, &filp->f_pos)) < 0) {
AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("%s: Write %u bytes to file %s error %d\n", __FUNCTION__,
length, filename, ret));
break;
}
} else {
if ( (ret=filp->f_op->read(filp, rbuf, length, &filp->f_pos)) < 0) {
AR_DEBUG_PRINTF(ATH_DEBUG_ERR, ("%s: Read %u bytes from file %s error %d\n", __FUNCTION__,
length, filename, ret));
break;
}
}
} while (0);
if (!IS_ERR(filp)) {
filp_close(filp, NULL);
}
set_fs(oldfs);
return ret;
}