read/write functions

["Vijay Chauhan" <kernel.vijay@xxxxxxxxx>]

Hi,

What are differences in read/write functions generic_file_read, generic_file_aio_read, vfs_read and do_sync_read
i mean where we should use the functions defined in fs/read_write.c and where we should use the functions defined in mm/filemap.c

TIA,
Vijay