ceph: don't implement writepage

Remove ceph_writepage as it's not strictly required these days.

To quote from commit 21b4ee7029c9 (xfs: drop ->writepage completely):

    ->writepage is only used in one place - single page writeback from
    memory reclaim. We only allow such writeback from kswapd, not from
    direct memory reclaim, and so it is rarely used. When it comes from
    kswapd, it is effectively random dirty page shoot-down, which is
    horrible for IO patterns. We will already have background writeback
    trying to clean all the dirty pages in memory as efficiently as
    possible, so having kswapd interrupt our well formed IO stream only
    slows things down. So get rid of xfs_vm_writepage() completely.

Signed-off-by: Jeff Layton <jlayton@kernel.org>

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 40830cb9b5997b7be9584767ddc07e849a9c53c6..3489444c55b97f1ac9dbbbfa6645693035009847 100644 (file)
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -680,30 +680,6 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
        return err;
 }
 
-static int ceph_writepage(struct page *page, struct writeback_control *wbc)
-{
-       int err;
-       struct inode *inode = page->mapping->host;
-       BUG_ON(!inode);
-       ihold(inode);
-
-       if (wbc->sync_mode == WB_SYNC_NONE &&
-           ceph_inode_to_client(inode)->write_congested)
-               return AOP_WRITEPAGE_ACTIVATE;
-
-       wait_on_page_fscache(page);
-
-       err = writepage_nounlock(page, wbc);
-       if (err == -ERESTARTSYS) {
-               /* direct memory reclaimer was killed by SIGKILL. return 0
-                * to prevent caller from setting mapping/page error */
-               err = 0;
-       }
-       unlock_page(page);
-       iput(inode);
-       return err;
-}
-
 /*
  * async writeback completion handler.
  *
@@ -1394,7 +1370,6 @@ out:
 const struct address_space_operations ceph_aops = {
        .readpage = netfs_readpage,
        .readahead = netfs_readahead,
-       .writepage = ceph_writepage,
        .writepages = ceph_writepages_start,
        .write_begin = ceph_write_begin,
        .write_end = ceph_write_end,