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    SubjectRe: Heuristic readahead for filesystems
    Date
    Am Mittwoch, 11. September 2002 20:43 schrieb Xuan Baldauf:

    > > Please correct me, if I am wrong, but wouldn't read() block ?
    >
    > AFAIK, "man open" tells
    >
    > [...]
    > int open(const char *pathname, int flags);
    > [...]
    > O_NONBLOCK or O_NDELAY
    > The file is opened in non-blocking mode. Neither the open
    > nor any __subsequent__ operations on the file descriptor
    > which is returned will cause the calling process to wait.
    > [...]
    >
    > So read won't block if the file has been opened with O_NONBLOCK.

    Well, so the man page tells you. The kernel sources tell otherwise, unless
    I am badly mistaken.

    > > Aio should be able to do it. But even that want help you with the stat
    > > data.
    >
    > Aio would help me announcing stat() usage for the future?

    No, it won't. But it would solve the issue of reading ahead.
    Stating needs a kernel implementation of 'stat ahead'
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