Btrfs: Fix btrfs_drop_extent_cache for skip pinned case

The check for skip pinned case is wrong, it may breaks the
while loop too soon.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 3d2e45c..3bfe9f0 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -179,18 +179,14 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                }
                flags = em->flags;
                if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
-                       if (em->start <= start &&
-                           (!testend || em->start + em->len >= start + len)) {
+                       if (testend && em->start + em->len >= start + len) {
                                free_extent_map(em);
                                write_unlock(&em_tree->lock);
                                break;
                        }
-                       if (start < em->start) {
-                               len = em->start - start;
-                       } else {
+                       start = em->start + em->len;
+                       if (testend)
                                len = start + len - (em->start + em->len);
-                               start = em->start + em->len;
-                       }
                        free_extent_map(em);
                        write_unlock(&em_tree->lock);
                        continue;