From 5b49f64db299d0b3f7c2170088186aa593d0be7d Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong@oracle.com>
Date: Tue, 30 Oct 2018 10:40:22 +1100
Subject: [PATCH] vfs: vfs_clone_file_prep_inodes should return EINVAL for a
clone from beyond EOF
Git-commit: 5b49f64db299d0b3f7c2170088186aa593d0be7d
Patch-mainline: v4.20-rc1
References: bsc#1133780, bsc#1132219
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.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Acked-by: Anthony Iliopoulos <ailiopoulos@suse.com>
---
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) {
--
2.16.4