read or write a file system buffer
struct buf *bp
The arguments are:
- The vnode that the buffer is for.
- The buffer to be read or written.
This call either reads or writes data from a file, depending on the value of
The call may block.
Always zero. Errors should be signalled by setting BIO_ERROR on b_ioflags field
in struct buf, and setting b_error to the appropriate errno value.
This manual page was written by Doug