SYSCALL_DEFINE5(preadv, 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_read_interruptible())
return -ENOMEM;
file = fget_light(fd, &fput_needed);
if (file) {
ret = -ESPIPE;
if (file->f_mode & FMODE_PREAD)
ret = vfs_readv(file, vec, vlen, &pos);
fput_light(file, fput_needed);
} else if (scribe_was_file_locking_interrupted())
ret = -ERESTARTSYS;
if (ret > 0)
add_rchar(current, ret);
inc_syscr(current);
return ret;
}
static int fd_do_readv(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 = 0, i;
iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL);
if (!iov) {
pr_err("Unable to allocate fd_do_readv 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_readv(fd, &iov[0], task->task_sg_nents, &pos);
set_fs(old_fs);
kfree(iov);
/*
* Return zeros and GOOD status even if the READ did not return
* the expected virt_size for struct file w/o a backing struct
* block_device.
*/
if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
if (ret < 0 || ret != task->task_size) {
pr_err("vfs_readv() returned %d,"
" expecting %d for S_ISBLK\n", ret,
(int)task->task_size);
return (ret < 0 ? ret : -EINVAL);
}
} else {
if (ret < 0) {
pr_err("vfs_readv() returned %d for non"
" S_ISBLK\n", ret);
return ret;
}
}
return 1;
}
asmlinkage ssize_t
sys_readv(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_readv(file, vec, vlen, &file->f_pos);
fput_light(file, fput_needed);
}
return ret;
}
static void handle_faf_readv(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) {
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_readv(file, iov, iovcnt, &ret.pos);
fput(file);
}
remote_sleep_finish();
err = rpc_pack_type(desc, ret);
if (err)
goto cancel;
if (ret.ret <= 0)
goto out_free;
err = send_iov(desc, iov, iovcnt, ret.ret, 0);
if (err)
goto cancel;
out_free:
if (iov)
free_iov(iov, iovcnt);
return;
cancel:
rpc_cancel(desc);
goto out_free;
}
SYSCALL_DEFINE3(readv, 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_readv(f.file, vec, vlen, &pos);
file_pos_write(f.file, pos);
fdput(f);
}
if (ret > 0)
add_rchar(current, ret);
inc_syscr(current);
return ret;
}
static ssize_t do_readv(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_readv(f.file, vec, vlen, &pos, flags);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
if (ret > 0)
add_rchar(current, ret);
inc_syscr(current);
return ret;
}
asmlinkage ssize_t
sys_readv(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_readv(file, vec, vlen, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
if (ret > 0)
current->rchar += ret;
current->syscr++;
return ret;
}
SYSCALL_DEFINE3(readv, 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_readv(file, vec, vlen, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
if (ret > 0)
add_rchar(current, ret);
inc_syscr(current);
return ret;
}
static ssize_t do_preadv(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_PREAD)
ret = vfs_readv(f.file, vec, vlen, &pos, flags);
fdput(f);
}
if (ret > 0)
add_rchar(current, ret);
inc_syscr(current);
return ret;
}
SYSCALL_DEFINE5(preadv, 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_PREAD)
ret = vfs_readv(f.file, vec, vlen, &pos);
fdput(f);
}
if (ret > 0)
add_rchar(current, ret);
inc_syscr(current);
return ret;
}
SYSCALL_DEFINE3(readv, 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_read_interruptible())
return -ENOMEM;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_readv(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_rchar(current, ret);
inc_syscr(current);
return ret;
}
int ret = 0, i;
iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL);
if (!iov) {
pr_err("Unable to allocate fd_do_readv iov[]\n");
return -ENOMEM;
}
for_each_sg(sgl, sg, sgl_nents, i) {
iov[i].iov_len = sg->length;
iov[i].iov_base = sg_virt(sg);
}
old_fs = get_fs();
set_fs(get_ds());
ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
set_fs(old_fs);
kfree(iov);
/*
* Return zeros and GOOD status even if the READ did not return
* the expected virt_size for struct file w/o a backing struct
* block_device.
*/
if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) {
if (ret < 0 || ret != cmd->data_length) {
pr_err("vfs_readv() returned %d,"
" expecting %d for S_ISBLK\n", ret,
(int)cmd->data_length);
return (ret < 0 ? ret : -EINVAL);
}