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>
diff --git a/fs/afs/write.c b/fs/afs/write.c
index e5f150b..2d2fccd 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;
}