From c5051c7bc777dffa5661569dec5997f432b9a34a Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Thu, 16 Mar 2017 16:27:49 +0000
Subject: [PATCH] afs: Don't wait for page writeback with the page lock held
Drop the page lock before waiting for page writeback.
Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/afs/write.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/fs/afs/write.c b/fs/afs/write.c
index e5f150bccfb5..2d2fccd5044b 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -518,17 +518,16 @@ static int afs_writepages_region(struct address_space *mapping,
*/
lock_page(page);
- if (page->mapping != mapping) {
+ if (page->mapping != mapping || !PageDirty(page)) {
unlock_page(page);
put_page(page);
continue;
}
- if (wbc->sync_mode != WB_SYNC_NONE)
- wait_on_page_writeback(page);
-
- if (PageWriteback(page) || !PageDirty(page)) {
+ if (PageWriteback(page)) {
unlock_page(page);
+ if (wbc->sync_mode != WB_SYNC_NONE)
+ wait_on_page_writeback(page);
put_page(page);
continue;
}