tree 7d887b59d943c5dd62c9604b7ea37fd2d650df71
parent b510882281d56873e1194021643b7c325336f84f
author David Howells <dhowells@redhat.com> 1238773359 +0100
committer David Howells <dhowells@redhat.com> 1238773359 +0100

CacheFiles: Permit the page lock state to be monitored

Add a function to install a monitor on the page lock waitqueue for a particular
page, thus allowing the page being unlocked to be detected.

This is used by CacheFiles to detect read completion on a page in the backing
filesystem so that it can then copy the data to the waiting netfs page.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>