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From 9075cb2c3c074b395192ce166fe17664b0d9543c Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Fri, 29 Jun 2018 06:11:53 +0200
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Subject: [PATCH 49/57] file-posix: Fix EINTR handling
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20180629061153.12687-14-famz@redhat.com>
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Patchwork-id: 81164
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH v2 13/13] file-posix: Fix EINTR handling
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Bugzilla: 1482537
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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EINTR should be checked against errno, not ret. While fixing the bug,
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collect the branches with a switch block.
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Also, change the return value from -ENOSTUP to -ENOSPC when the actual
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issue is request range passes EOF, which should be distinguishable from
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the case of error == ENOSYS by the caller, so that it could still retry
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with other byte ranges, whereas it shouldn't retry anymore upon ENOSYS.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/file-posix.c | 17 +++++++++--------
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1 file changed, 9 insertions(+), 8 deletions(-)
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diff --git a/block/file-posix.c b/block/file-posix.c
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index 29ff699..0a9df5b 100644
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--- a/block/file-posix.c
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+++ b/block/file-posix.c
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@@ -1449,20 +1449,21 @@ static ssize_t handle_aiocb_copy_range(RawPosixAIOData *aiocb)
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ssize_t ret = copy_file_range(aiocb->aio_fildes, &in_off,
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aiocb->aio_fd2, &out_off,
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bytes, 0);
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- if (ret == -EINTR) {
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- continue;
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+ if (ret == 0) {
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+ /* No progress (e.g. when beyond EOF), let the caller fall back to
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+ * buffer I/O. */
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+ return -ENOSPC;
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}
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if (ret < 0) {
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- if (errno == ENOSYS) {
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+ switch (errno) {
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+ case ENOSYS:
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return -ENOTSUP;
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- } else {
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+ case EINTR:
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+ continue;
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+ default:
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return -errno;
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}
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}
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- if (!ret) {
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- /* No progress (e.g. when beyond EOF), fall back to buffer I/O. */
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- return -ENOTSUP;
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- }
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bytes -= ret;
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}
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return 0;
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--
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1.8.3.1
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