From 85c95f208f481ab3c34c4622f508272cd4803afd Mon Sep 17 00:00:00 2001
From: Mark Fasheh <mfasheh@suse.de>
Date: Mon, 10 Sep 2018 16:21:18 -0700
Subject: [PATCH] vfs: dedupe should return EPERM if permission is not granted
Git-commit: 85c95f208f481ab3c34c4622f508272cd4803afd
Patch-mainline: v4.20-rc1
References: bsc#1133779, bsc#1132219

Right now we return EINVAL if a process does not have permission to dedupe a
file. This was an oversight on my part. EPERM gives a true description of
the nature of our error, and EINVAL is already used for the case that the
filesystem does not support dedupe.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: David Sterba <dsterba@suse.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

---
 fs/read_write.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index be0e8723a049..c734bc2880a5 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1991,7 +1991,7 @@ int vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
 	if (ret < 0)
 		goto out_drop_write;

-	ret = -EINVAL;
+	ret = -EPERM;
 	if (!allow_file_dedupe(dst_file))
 		goto out_drop_write;

--
2.16.4