generic_file_aio_read — generic filesystem read routine
ssize_t generic_file_aio_read
(struct kiocb * iocb, const struct iovec * iov, unsigned long nr_segs, loff_t pos);
kernel I/O control block
io vector request
number of segments in the iovec
current file position
This is the “read” routine for all filesystems that can use the page cache directly.