Can I try to bring your attention once more to the following issue: On 4/18/05, Martin Jambor <[EMAIL PROTECTED]> wrote: > There is one thing about cache pages and buffers that puzzles me and > that I have not found in any documenatation and that is not quite > obvious from the source. > > What is the relationship between: > a) pages and their buffers associated with the device (typically > bh->bdev->bd_inode and its mapping) and > > b) pages and their buffers associated with files on that device. > > Can anyone tell me what the relationship exactly is and what one has > to be aware of when manipulating either of these?
My conclusion from reading the source is that after mapping a file buffer (buffer belonging to a page that is a part of a file on a device) to a particular block on a device, one should call unmap_underlying_metadata to make sure any writing using a device buffer will not overwrite the file. And that one must not use device buffers to write to places which have been mapped to files. Is that correct? TIA Martin - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
