74 lines
1.8 KiB
Diff
74 lines
1.8 KiB
Diff
From c6e63723e33a65cb93348a3f32a1a5828159786f Mon Sep 17 00:00:00 2001
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From: Colin Ian King <colin.king@canonical.com>
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Date: Tue, 19 May 2020 12:37:24 +0100
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Subject: [PATCH 12/28] stress-dev: add block device lseeks and force return to
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be stashed
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Block devices can be lseek'd so add this. For all lseeks stash the
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return offset to force compiler to not optimize anything away.
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Signed-off-by: Colin Ian King <colin.king@canonical.com>
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---
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stress-dev.c | 24 +++++++++++++++++-------
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1 file changed, 17 insertions(+), 7 deletions(-)
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diff --git a/stress-dev.c b/stress-dev.c
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index 2eeb72c8cc21..b3c156ba5eb9 100644
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--- a/stress-dev.c
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+++ b/stress-dev.c
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@@ -503,6 +503,8 @@ static void stress_dev_blk(
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const int fd,
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const char *devpath)
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{
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+ off_t offset;
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+
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(void)name;
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(void)fd;
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(void)devpath;
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@@ -633,6 +635,14 @@ static void stress_dev_blk(
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(void)ret;
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}
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#endif
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+ offset = lseek(fd, 0, SEEK_END);
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+ stress_uint64_put((uint64_t)offset);
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+
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+ offset = lseek(fd, 0, SEEK_SET);
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+ stress_uint64_put((uint64_t)offset);
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+
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+ offset = lseek(fd, 0, SEEK_CUR);
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+ stress_uint64_put((uint64_t)offset);
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}
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#if defined(__linux__)
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@@ -1167,7 +1177,7 @@ static inline void stress_dev_rw(
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int32_t loops)
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{
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int fd, ret;
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- off_t off;
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+ off_t offset;
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struct stat buf;
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struct pollfd fds[1];
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fd_set rfds;
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@@ -1231,12 +1241,12 @@ static inline void stress_dev_rw(
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stress_dev_tty(args->name, fd, path);
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#endif
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- off = lseek(fd, 0, SEEK_SET);
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- (void)off;
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- off = lseek(fd, 0, SEEK_CUR);
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- (void)off;
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- off = lseek(fd, 0, SEEK_END);
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- (void)off;
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+ offset = lseek(fd, 0, SEEK_SET);
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+ stress_uint64_put((uint64_t)offset);
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+ offset = lseek(fd, 0, SEEK_CUR);
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+ stress_uint64_put((uint64_t)offset);
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+ offset = lseek(fd, 0, SEEK_END);
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+ stress_uint64_put((uint64_t)offset);
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if (stress_time_now() - t_start > threshold) {
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timeout = true;
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--
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2.21.3
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