SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h)
{
loff_t pos = pos_from_hilo(pos_h, pos_l);
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
if (pos < 0)
return -EINVAL;
if (scribe_track_next_file_write_interruptible())
return -ENOMEM;
file = fget_light(fd, &fput_needed);
if (file) {
ret = -ESPIPE;
if (file->f_mode & FMODE_PWRITE)
ret = vfs_writev(file, vec, vlen, &pos);
fput_light(file, fput_needed);
} else if (scribe_was_file_locking_interrupted())
ret = -ERESTARTSYS;
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
void
rumpcomp_virtif_send(struct virtif_user *vu, struct iovec *iov, size_t niov)
{
mm_segment_t oseg;
loff_t off = 0;
ssize_t nn;
oseg = get_fs();
set_fs(get_ds());
/* something is written, rest (if any) is dropped */
KLOCK_WRAP(nn = vfs_writev(vu->tapfile, iov, niov, &off));
set_fs(oseg);
}
asmlinkage ssize_t
sys_writev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
file = fget_light(fd, &fput_needed);
if (file) {
ret = vfs_writev(file, vec, vlen, &file->f_pos);
fput_light(file, fput_needed);
}
return ret;
}
/**
* tag: the tag of this command
* msg: concrete command string to write to /dev/log/exception
* return: on success return the bytes writed successfully, on error return -1
*
*/
int log_to_exception(char* tag, char* msg)
{
mm_segment_t oldfs;
struct file *file;
unsigned char * prio_err = "6";//ANDROID_ERROR
int ret = 0;
struct iovec vec[3];
if(NULL == tag || NULL == msg)
{
pr_err("log_exception: the arguments invalidate\n");
return -1;
}
oldfs = get_fs();
set_fs(KERNEL_DS);
file = filp_open(LOG_EXCEPTION_FS,O_RDWR,0);
if(!file || IS_ERR(file))
{
pr_err("log_exception: Failed to access /dev/log/exception\n");
set_fs(oldfs);
return -1;
}
vec[0].iov_base = prio_err;
vec[0].iov_len = 1;
vec[1].iov_base = tag;
vec[1].iov_len = strlen(tag) + 1;
vec[2].iov_base = msg;
vec[2].iov_len = strlen(msg)+1;
ret = vfs_writev(file, &vec[0], 3, &file->f_pos);
if(ret < 0)
{
pr_err("log_exception: Failed to write to /dev/log/exception\n");
filp_close(file, NULL);
set_fs(oldfs);
return -1;
}
filp_close(file, NULL);
set_fs(oldfs);
return ret;
}
static void handle_faf_writev(struct rpc_desc *desc, void *__msg, size_t size)
{
struct faf_rw_msg *msg = __msg;
struct faf_rw_ret ret;
struct file *file;
struct iovec *iov;
int iovcnt, err;
err = alloc_iov(&iov, &iovcnt, msg->count);
if (!err) {
err = recv_iov(desc, iov, iovcnt, msg->count, 0);
if (err)
goto cancel;
} else {
ret.ret = err;
iov = NULL;
}
err = remote_sleep_prepare(desc);
if (err)
goto cancel;
ret.pos = msg->pos;
if (iov) {
file = fget(msg->server_fd);
ret.ret = vfs_writev(file, iov, iovcnt, &ret.pos);
fput(file);
}
remote_sleep_finish();
err = rpc_pack_type(desc, ret);
if (err)
goto cancel;
out_free:
if (iov)
free_iov(iov, iovcnt);
return;
cancel:
rpc_cancel(desc);
goto out_free;
}
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
struct fd f = fdget(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_writev(f.file, vec, vlen, &pos);
file_pos_write(f.file, pos);
fdput(f);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
static ssize_t do_writev(unsigned long fd, const struct iovec __user *vec,
unsigned long vlen, int flags)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_writev(f.file, vec, vlen, &pos, flags);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
asmlinkage ssize_t
sys_writev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_writev(file, vec, vlen, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
if (ret > 0)
current->wchar += ret;
current->syscw++;
return ret;
}
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_writev(file, vec, vlen, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
static ssize_t do_pwritev(unsigned long fd, const struct iovec __user *vec,
unsigned long vlen, loff_t pos, int flags)
{
struct fd f;
ssize_t ret = -EBADF;
if (pos < 0)
return -EINVAL;
f = fdget(fd);
if (f.file) {
ret = -ESPIPE;
if (f.file->f_mode & FMODE_PWRITE)
ret = vfs_writev(f.file, vec, vlen, &pos, flags);
fdput(f);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
static int fd_do_writev(struct se_task *task)
{
struct fd_request *req = FILE_REQ(task);
struct se_device *se_dev = req->fd_task.task_se_cmd->se_dev;
struct fd_dev *dev = se_dev->dev_ptr;
struct file *fd = dev->fd_file;
struct scatterlist *sg = task->task_sg;
struct iovec *iov;
mm_segment_t old_fs;
loff_t pos = (task->task_lba *
se_dev->se_sub_dev->se_dev_attrib.block_size);
int ret, i = 0;
iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
if (!iov) {
pr_err("Unable to allocate fd_do_writev iov[]\n");
return -ENOMEM;
}
for (i = 0; i < task->task_sg_nents; i++) {
iov[i].iov_len = sg[i].length;
iov[i].iov_base = sg_virt(&sg[i]);
}
old_fs = get_fs();
set_fs(get_ds());
ret = vfs_writev(fd, &iov[0], task->task_sg_nents, &pos);
set_fs(old_fs);
kfree(iov);
if (ret < 0 || ret != task->task_size) {
pr_err("vfs_writev() returned %d\n", ret);
return (ret < 0 ? ret : -EINVAL);
}
return 1;
}
SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h)
{
loff_t pos = pos_from_hilo(pos_h, pos_l);
struct fd f;
ssize_t ret = -EBADF;
if (pos < 0)
return -EINVAL;
f = fdget(fd);
if (f.file) {
ret = -ESPIPE;
if (f.file->f_mode & FMODE_PWRITE)
ret = vfs_writev(f.file, vec, vlen, &pos);
fdput(f);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
if (scribe_track_next_file_write_interruptible())
return -ENOMEM;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_writev(file, vec, vlen, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
} else if (scribe_was_file_locking_interrupted())
ret = -ERESTARTSYS;
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}