[PATCH 02/25] vfs: vfs_clone_file_prep_inodes should return EINVAL for a clone from beyond EOF

[Darrick J. Wong]

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

vfs_clone_file_prep_inodes cannot return 0 if it is asked to remap from
a zero byte file because that's what btrfs does.

Signed-off-by: Darrick J. Wong <darrick.w...@oracle.com>
Reviewed-by: Christoph Hellwig <h...@lst.de>
---
 fs/read_write.c |    3 ---
 1 file changed, 3 deletions(-)


diff --git a/fs/read_write.c b/fs/read_write.c
index 8a2737f0d61d..260797b01851 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1740,10 +1740,7 @@ int vfs_clone_file_prep_inodes(struct inode *inode_in, 
loff_t pos_in,
        if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
                return -EINVAL;
 
-       /* Are we going all the way to the end? */
        isize = i_size_read(inode_in);
-       if (isize == 0)
-               return 0;
 
        /* Zero length dedupe exits immediately; reflink goes to EOF. */
        if (*len == 0) {