tree 3e1b73b0db29994e8fb56c727c38c1167922f189
parent 0be2e98173f8badd5ccc7c2e994891746ba1caf4
author Chris Mason <chris.mason@oracle.com> 1265221125 +0000
committer Chris Mason <chris.mason@oracle.com> 1268665212 -0400

Btrfs: finish read pages in the order they are submitted

The endio is done at reverse order of bio vectors.

That means for a sequential read, the page first submitted will finish
last in a bio. Considering we will do checksum (making cache hot) for
every page, this does introduce delay (and chance to squeeze cache used
soon) for pages submitted at the begining.

I don't observe obvious performance difference with below patch at my
simple test, but seems more natural to finish read in the order they are
submitted.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>