{
struct snapshot_data *data;
ssize_t res;
+ loff_t pg_offp = *offp & ~PAGE_MASK;
mutex_lock(&pm_mutex);
res = -ENODATA;
goto Unlock;
}
- res = snapshot_read_next(&data->handle, count);
- if (res > 0) {
- if (copy_to_user(buf, data_of(data->handle), res))
- res = -EFAULT;
- else
- *offp = data->handle.offset;
+ if (!pg_offp) { /* on page boundary? */
+ res = snapshot_read_next(&data->handle);
+ if (res <= 0)
+ goto Unlock;
+ } else {
+ res = PAGE_SIZE - pg_offp;
}
+ res = simple_read_from_buffer(buf, count, &pg_offp,
+ data_of(data->handle), res);
+ if (res > 0)
+ *offp += res;
+
Unlock:
mutex_unlock(&pm_mutex);
{
struct snapshot_data *data;
ssize_t res;
+ loff_t pg_offp = *offp & ~PAGE_MASK;
mutex_lock(&pm_mutex);
data = filp->private_data;
- res = snapshot_write_next(&data->handle, count);
- if (res > 0) {
- if (copy_from_user(data_of(data->handle), buf, res))
- res = -EFAULT;
- else
- *offp = data->handle.offset;
+
+ if (!pg_offp) {
+ res = snapshot_write_next(&data->handle);
+ if (res <= 0)
+ goto unlock;
+ } else {
+ res = PAGE_SIZE - pg_offp;
}
+ res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,
+ buf, count);
+ if (res > 0)
+ *offp += res;
+unlock:
mutex_unlock(&pm_mutex);
return res;