[lkml]   [2002]   [Sep]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: (fwd) Re: [RFC] mount flag "direct"
On Friday 06 September 2002 19:20, Anton Altaparmakov wrote:
> As of very recently, Andrew Morton introduced an optimization to this with
> the get_blocks() interface in 2.5 kernels. Now the file system, when doing
> direct_IO at least, returns to the VFS the requested block position _and_
> the size of the block. So the VFS now gains in power in that it only needs
> to ask for each block once as it is now aware of the size of the block.
> But still, even with this optimization, the VFS still asks the FS for each
> block, and then the FS has to lookup each block.

Well, it takes no great imagination to see the progression: get_blocks
acts on extents instead of arrays of blocks. Expect to see that around
the 2.7 timeframe.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:28    [W:0.105 / U:0.816 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site