diff options
| author | David Howells <dhowells@redhat.com> | 2009-04-03 16:42:39 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2009-04-03 16:42:39 +0100 |
| commit | 385e1ca5f21c4680ad6a46a3aa2ea8af99e99c92 (patch) | |
| tree | 7d887b59d943c5dd62c9604b7ea37fd2d650df71 /include/linux/pagemap.h | |
| parent | b510882281d56873e1194021643b7c325336f84f (diff) | |
| download | lwn-385e1ca5f21c4680ad6a46a3aa2ea8af99e99c92.tar.gz lwn-385e1ca5f21c4680ad6a46a3aa2ea8af99e99c92.zip | |
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/linux/pagemap.h')
| -rw-r--r-- | include/linux/pagemap.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 076a7dc67c2b..34da5230faab 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 |