Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

CacheFiles: Permit the page lock state to be monitored

Browse source 
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>
This commit is contained in:
David Howells 2009-04-03 16:42:39 +01:00
parent b510882281
commit 385e1ca5f2
2 changed files with 23 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
include/linux/pagemap.h
View file

@ -383,6 +383,11 @@ static inline void wait_on_page_writeback(struct page *page)
extern void end_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. * Fault a userspace page into pagetables. Return non-zero on a fault.
* *

18
mm/filemap.c
View file

@ -564,6 +564,24 @@ void wait_on_page_bit(struct page *page, int bit_nr)
} }
EXPORT_SYMBOL(wait_on_page_bit); EXPORT_SYMBOL(wait_on_page_bit);
/**
* add_page_wait_queue - Add an arbitrary waiter to a page's wait queue
* @page - Page defining the wait queue of interest
* @waiter - Waiter to add to the queue
*
* Add an arbitrary @waiter to the wait queue for the nominated @page.
*/
void add_page_wait_queue(struct page *page, wait_queue_t *waiter)
{
wait_queue_head_t *q = page_waitqueue(page);
unsigned long flags;
spin_lock_irqsave(&q->lock, flags);
__add_wait_queue(q, waiter);
spin_unlock_irqrestore(&q->lock, flags);
}
EXPORT_SYMBOL_GPL(add_page_wait_queue);
/** /**
* unlock_page - unlock a locked page * unlock_page - unlock a locked page
* @page: the page * @page: the page