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From 685bcc56351b3e46b69d46118d23268b69052097 Mon Sep 17 00:00:00 2001
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From: Ondrej Kozina <okozina@redhat.com>
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Date: Tue, 19 Jun 2018 14:07:20 +0200
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Subject: [PATCH 1/4] Zero length lseek blockwise i/o should return zero.
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Note that both functions perform seek operations aligned to sector
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boundary if possible before returning.
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Unaligned input offset gets aligned on first preceding sector
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boundary.
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---
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lib/utils_io.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/lib/utils_io.c b/lib/utils_io.c
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index 0f671d6..94c4ef6 100644
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--- a/lib/utils_io.c
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+++ b/lib/utils_io.c
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@@ -199,7 +199,7 @@ ssize_t write_lseek_blockwise(int fd, size_t bsize, size_t alignment,
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if (lseek(fd, offset - frontHang, SEEK_SET) < 0)
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return -1;
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- if (frontHang) {
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+ if (frontHang && length) {
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if (posix_memalign(&frontPadBuf, alignment, bsize))
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return -1;
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@@ -253,7 +253,7 @@ ssize_t read_lseek_blockwise(int fd, size_t bsize, size_t alignment,
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if (lseek(fd, offset - frontHang, SEEK_SET) < 0)
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return -1;
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- if (frontHang) {
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+ if (frontHang && length) {
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if (posix_memalign(&frontPadBuf, alignment, bsize))
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return -1;
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--
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1.8.3.1
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