Re: Can O_SYNC be implemented by using fsync?

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Mon May 15 2000 - 19:32:43 EDT

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    > } Also I guess fsync()ing bookmarks updates is useful.
    > }
    > Maybe it wants cache integrity? Dunno...I simply got VERY poor
    > performance when I did an ll_rw_block() call if the O_SYNC flag was set
    > on the file pointer.

    O_SYNC applies to the write() not the blocks. That is you want to do

            while(blocks)
            {
                    stuff it in cache
                    if(sync)
                            queue_the_io
            }
            if(!sync)
                    return;
            while(queued_ios_left)
                    wait

    Alan

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