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authorDavid Howells <dhowells@redhat.com>2009-04-03 16:42:39 +0100
committerDavid Howells <dhowells@redhat.com>2009-04-03 16:42:39 +0100
commit385e1ca5f21c4680ad6a46a3aa2ea8af99e99c92 (patch)
tree7d887b59d943c5dd62c9604b7ea37fd2d650df71 /include
parentb510882281d56873e1194021643b7c325336f84f (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/pagemap.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 076a7dc67c2..34da5230faa 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -384,6 +384,11 @@ static inline void wait_on_page_writeback(struct page *page)
extern void end_page_writeback(struct page *page);
/*
+ * Add an arbitrary waiter to a page's wait queue
+ */
+extern void add_page_wait_queue(struct page *page, wait_queue_t *waiter);
+
+/*
* Fault a userspace page into pagetables. Return non-zero on a fault.
*
* This assumes that two userspace pages are always sufficient. That's