file-posix: Fix EINTR handling
EINTR should be checked against errno, not ret. While fixing the bug,
collect the branches with a switch block.
Also, change the return value from -ENOSTUP to -ENOSPC when the actual
issue is request range passes EOF, which should be distinguishable from
the case of error == ENOSYS by the caller, so that it could still retry
with other byte ranges, whereas it shouldn't retry anymore upon ENOSYS.
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block/file-posix.c b/block/file-posix.c
index e3f1b04..829ee53 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1488,20 +1488,21 @@
ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off,
aiocb->aio_fd2, &out_off,
bytes, 0);
- if (ret == -EINTR) {
- continue;
+ if (ret == 0) {
+ /* No progress (e.g. when beyond EOF), let the caller fall back to
+ * buffer I/O. */
+ return -ENOSPC;
}
if (ret < 0) {
- if (errno == ENOSYS) {
+ switch (errno) {
+ case ENOSYS:
return -ENOTSUP;
- } else {
+ case EINTR:
+ continue;
+ default:
return -errno;
}
}
- if (!ret) {
- /* No progress (e.g. when beyond EOF), fall back to buffer I/O. */
- return -ENOTSUP;
- }
bytes -= ret;
}
return 0;
