performance/stat-prefetch: Add support code to implement lookup-behind.

- change sp_lookup and sp_lookup_cbk to support sending lookups when needed.
    lookups might need to be sent in fops like open, chmod, chown etc which
    operate on a path, since the actual lookup sent to stat-prefetch by its
    parent xlators is not propagated down the xlator tree if the path is
    cached.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 284 (performance actually decreases for 'ls -l' on a directory containing large number of files with stat-prefetch loaded)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=284

0 files changed, 0 insertions, 0 deletions