Merge tag 'nfs-for-3.18-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

[karo-tx-linux.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 8554d20b3523eef2365a4d48185721be2960bcdf..0ab0a3ea5721a75b204bd34dc7c1bdeece07b04d 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -670,17 +670,13 @@ EXPORT_SYMBOL(__page_cache_alloc);
  * at a cost of "thundering herd" phenomena during rare hash
  * collisions.
  */
-static wait_queue_head_t *page_waitqueue(struct page *page)
+wait_queue_head_t *page_waitqueue(struct page *page)
 {
        const struct zone *zone = page_zone(page);
 
        return &zone->wait_table[hash_ptr(page, zone->wait_table_bits)];
 }
-
-static inline void wake_up_page(struct page *page, int bit)
-{
-       __wake_up_bit(page_waitqueue(page), &page->flags, bit);
-}
+EXPORT_SYMBOL(page_waitqueue);
 
 void wait_on_page_bit(struct page *page, int bit_nr)
 {
@@ -703,6 +699,19 @@ int wait_on_page_bit_killable(struct page *page, int bit_nr)
                             bit_wait_io, TASK_KILLABLE);
 }
 
+int wait_on_page_bit_killable_timeout(struct page *page,
+                                      int bit_nr, unsigned long timeout)
+{
+       DEFINE_WAIT_BIT(wait, &page->flags, bit_nr);
+
+       wait.key.timeout = jiffies + timeout;
+       if (!test_bit(bit_nr, &page->flags))
+               return 0;
+       return __wait_on_bit(page_waitqueue(page), &wait,
+                            bit_wait_io_timeout, TASK_KILLABLE);
+}
+EXPORT_SYMBOL_GPL(wait_on_page_bit_killable_timeout);
+
 /**
  * add_page_wait_queue - Add an arbitrary waiter to a page's wait queue
  * @page: Page defining the wait queue of interest