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-rw-r--r--fs/fscache/page.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index 85332b9d19d1..781ac7b0b53e 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -44,6 +44,19 @@ void __fscache_wait_on_page_write(struct fscache_cookie *cookie, struct page *pa
EXPORT_SYMBOL(__fscache_wait_on_page_write);
/*
+ * wait for a page to finish being written to the cache. Put a timeout here
+ * since we might be called recursively via parent fs.
+ */
+static
+bool release_page_wait_timeout(struct fscache_cookie *cookie, struct page *page)
+{
+ wait_queue_head_t *wq = bit_waitqueue(&cookie->flags, 0);
+
+ return wait_event_timeout(*wq, !__fscache_check_page_write(cookie, page),
+ HZ);
+}
+
+/*
* decide whether a page can be released, possibly by cancelling a store to it
* - we're allowed to sleep if __GFP_WAIT is flagged
*/
@@ -115,7 +128,10 @@ page_busy:
}
fscache_stat(&fscache_n_store_vmscan_wait);
- __fscache_wait_on_page_write(cookie, page);
+ if (!release_page_wait_timeout(cookie, page))
+ _debug("fscache writeout timeout page: %p{%lx}",
+ page, page->index);
+
gfp &= ~__GFP_WAIT;
goto try_again;
}