[PATCH 20/25] ocfs2: truncate page cache for clone destination file before remapping

[Darrick J. Wong]

From: Darrick J. Wong <darrick.w...@oracle.com>

When cloning blocks into another file, truncate the page cache before we
start remapping blocks so that concurrent reads wait for us to finish.

Signed-off-by: Darrick J. Wong <darrick.w...@oracle.com>
---
 fs/ocfs2/refcounttree.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)


diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index a3df118bf3b9..851ba3ae7ce8 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -4869,14 +4869,12 @@ int ocfs2_reflink_remap_range(struct file *file_in,
                down_write_nested(&OCFS2_I(inode_out)->ip_alloc_sem,
                                  SINGLE_DEPTH_NESTING);
 
-       ret = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in, inode_out,
-                                        out_bh, pos_out, len);
-
        /* Zap any page cache for the destination file's range. */
-       if (!ret)
-               truncate_inode_pages_range(&inode_out->i_data, pos_out,
-                                          PAGE_ALIGN(pos_out + len) - 1);
+       truncate_inode_pages_range(&inode_out->i_data, pos_out,
+                                  PAGE_ALIGN(pos_out + len) - 1);
 
+       ret = ocfs2_reflink_remap_blocks(inode_in, in_bh, pos_in, inode_out,
+                                        out_bh, pos_out, len);
        up_write(&OCFS2_I(inode_in)->ip_alloc_sem);
        if (!same_inode)
                up_write(&OCFS2_I(inode_out)->ip_alloc_sem);