[PATCH 1/2] btrfs: convert: Make read_disk_extent() return more meaningful -EIO other -1

[Qu Wenruo <wqu@suse.com>]

When pread64() returns value smaller than expected, it normally means
EIO, so just return -EIO to replace the intermediate number.
So when IO fails, we should be able to get more meaningful error number
of than EPERM.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 convert/source-fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/convert/source-fs.c b/convert/source-fs.c
index b6d08370428a..5660a22cc652 100644
--- a/convert/source-fs.c
+++ b/convert/source-fs.c
@@ -201,7 +201,7 @@ int read_disk_extent(struct btrfs_root *root, u64 bytenr,
 	ret = 0;
 fail:
 	if (ret > 0)
-		ret = -1;
+		ret = -EIO;
 	return ret;
 }
 
-- 
2.19.0