The read loop always requested 4096 bytes, which only works
when the total read length is a multiple of 4096 bytes.
This is not neccessarily true, and when it's not, len wraps
around to UINT64_MAX and you get a lot of these:
ERROR: [error:38] reached EOF:Success
This was caught when running xfstests against gocryptfs,
an encrypted overlay file system.
On ext4, the test still passes after this change.
Signed-off-by: Jakob Unterwurzacher <jakobunt@xxxxxxxxx>
---
src/seek_copy_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/seek_copy_test.c b/src/seek_copy_test.c
index 0c2c6a3d..28c021e2 100644
--- a/src/seek_copy_test.c
+++ b/src/seek_copy_test.c
@@ -98,7 +98,7 @@ do_extent_copy(int src_fd, int dest_fd, off_t data_off, off_t hole_off)
}
while (len > 0) {
- ssize_t nr_read = read(src_fd, buf, BUF_SIZE);
+ ssize_t nr_read = read(src_fd, buf, MIN(len, BUF_SIZE));
if (nr_read < 0) {
if (errno == EINTR)
continue;
--
2.31.1
