[PATCH] erofs-utils: lib: justify post-EOD read behavior

[Gao Xiang]

In the past, errors will be returned when reading post-EOD data.
Let's align this with the generic EOD behavior (zero-filling) instead.

Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.com>
---
 lib/io.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/lib/io.c b/lib/io.c
index b318d91..2daa3d3 100644
--- a/lib/io.c
+++ b/lib/io.c
@@ -284,18 +284,18 @@ int dev_read(int device_id, void *buf, u64 offset, size_t 
len)
 #else
                read_count = pread(fd, buf, len, (off_t)offset);
 #endif
-               if (read_count == -1 || read_count == 0) {
-                       if (errno) {
+               if (read_count < 1) {
+                       if (!read_count) {
+                               erofs_err("Reach EOF of device - %s:[%" PRIu64 
", %zd].",
+                                         erofs_devname, offset, len);
+                               memset(buf, 0, len);
+                               read_count = len;
+                       } else if (errno != EINTR) {
                                erofs_err("Failed to read data from device - 
%s:[%" PRIu64 ", %zd].",
                                          erofs_devname, offset, len);
                                return -errno;
-                       } else {
-                               erofs_err("Reach EOF of device - %s:[%" PRIu64 
", %zd].",
-                                         erofs_devname, offset, len);
-                               return -EINVAL;
                        }
                }
-
                offset += read_count;
                len -= read_count;
                buf += read_count;
-- 
2.24.4