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From 43b6e31f39edbe7de4f4feeef4d0cf6be093e021 Mon Sep 17 00:00:00 2001
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From: Jan Kara <jack@suse.cz>
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Date: Mon, 23 Nov 2020 17:12:27 +0100
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Subject: [PATCH] quotaio_xfs: Warn when large kernel timestamps cannot be
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handled
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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When time_t is 32-bit, warn if the kernel returns anything that cannot
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fit in these time stamps. This also fixes a compilation warning that
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shift exceeds data type size. Similarly when converting data to pass to
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kernel, just avoid the pointless shift (generating compiler warning)
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when time_t is 32-bit.
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Reported-by: "Dmitry V. Levin" <ldv@altlinux.org>
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Signed-off-by: Jan Kara <jack@suse.cz>
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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configure.ac | 2 ++
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quotaio_xfs.c | 9 +++++++++
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2 files changed, 11 insertions(+)
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diff --git a/configure.ac b/configure.ac
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index 2239b49..296b77a 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -82,6 +82,8 @@ AS_IF([test x"$enable_werror" != "xno"], [
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])
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AC_SUBST([WARN_CFLAGS])
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+AC_CHECK_SIZEOF([time_t], [], [#include <time.h>])
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+
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# =========
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# Find ldap
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# =========
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diff --git a/quotaio_xfs.c b/quotaio_xfs.c
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index 2db1c0c..5abb2c2 100644
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--- a/quotaio_xfs.c
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+++ b/quotaio_xfs.c
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@@ -45,8 +45,13 @@ report: xfs_report
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static inline time_t xfs_kern2utildqblk_ts(const struct xfs_kern_dqblk *k,
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__s32 timer, __s8 timer_hi)
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{
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+#if SIZEOF_TIME_T > 4
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if (k->d_fieldmask & FS_DQ_BIGTIME)
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return (__u32)timer | (__s64)timer_hi << 32;
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+#else
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+ if (k->d_fieldmask & FS_DQ_BIGTIME && timer_hi != 0)
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+ errstr(_("Truncating kernel returned time stamp."));
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+#endif
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return timer;
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}
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@@ -54,10 +59,14 @@ static inline void xfs_util2kerndqblk_ts(const struct xfs_kern_dqblk *k,
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__s32 *timer_lo, __s8 *timer_hi, time_t timer)
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{
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*timer_lo = timer;
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+#if SIZEOF_TIME_T > 4
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if (k->d_fieldmask & FS_DQ_BIGTIME)
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*timer_hi = timer >> 32;
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else
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*timer_hi = 0;
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+#else
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+ *timer_hi = 0;
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+#endif
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}
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static inline int want_bigtime(time_t timer)
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--
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2.26.2
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