Re: Can O_SYNC be implemented by using fsync?

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Mon May 15 2000 - 18:32:43 EST

> } 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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