ceph: cleanup the logic in ceph_invalidatepage

The invalidatepage code bails if it encounters a non-zero page offset. The
current logic that does is non-obvious with multiple if statements.

This should be logically and functionally equivalent.

Signed-off-by: Milosz Tanski <milosz@adfin.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 15 insertions, 14 deletions

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 722585cd5c7e..cb78ce81d6a6 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -151,6 +151,13 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
         struct ceph_snap_context *snapc = page_snap_context(page);
 
         inode = page->mapping->host;
+        ci = ceph_inode(inode);
+
+        if (offset != 0 || length != PAGE_CACHE_SIZE) {
+                dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
+                     inode, page, page->index, offset, length);
+                return;
+        }
 
         /*
          * We can get non-dirty pages here due to races between
@@ -160,21 +167,15 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
         if (!PageDirty(page))
                 pr_err("%p invalidatepage %p page not dirty\n", inode, page);
 
-        if (offset == 0 && length == PAGE_CACHE_SIZE)
-                ClearPageChecked(page);
+        ClearPageChecked(page);
 
-        ci = ceph_inode(inode);
-        if (offset == 0 && length == PAGE_CACHE_SIZE) {
-                dout("%p invalidatepage %p idx %lu full dirty page\n",
-                     inode, page, page->index);
-                ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
-                ceph_put_snap_context(snapc);
-                page->private = 0;
-                ClearPagePrivate(page);
-        } else {
-                dout("%p invalidatepage %p idx %lu partial dirty page %u(%u)\n",
-                     inode, page, page->index, offset, length);
-        }
+        dout("%p invalidatepage %p idx %lu full dirty page\n",
+             inode, page, page->index);
+
+        ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
+        ceph_put_snap_context(snapc);
+        page->private = 0;
+        ClearPagePrivate(page);
 }
 
 /* just a sanity check */