linux-kernel - [PATCH 01/10] fs: Add current_fs_time

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Date:	Tue,  2 Feb 2016 22:07:41 -0800
From:	Deepa Dinamani <deepa.kernel@...il.com>
To:	linux-fsdevel@...r.kernel.org, y2038@...ts.linaro.org
Cc:	Arnd Bergmann <arnd@...db.de>, Dave Chinner <david@...morbit.com>,
	"Theodore Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 01/10] fs: Add current_fs_time_sec() function

This is in preparation for the series that transitions
filesystem timestamps to use 64 bit time and hence make
them y2038 safe.

The function is meant to replace CURRENT_TIME_SEC macro.
The macro CURRENT_TIME_SEC does not represent filesystem times
correctly as it cannot perform range checks.
current_fs_time_sec() will be extended to include these.

CURRENT_TIME_SEC is also not y2038 safe. current_fs_time_sec()
will be transitioned to use 64 bit time along with vfs in a
separate series.

The function is inline for now to maintain similar performance
to that of the macro.

The function takes super block as a parameter to allow for
future range checking of filesystem timestamps.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
---
 include/linux/fs.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6a75571..4af612f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1407,6 +1407,11 @@ struct super_block {

 extern struct timespec current_fs_time(struct super_block *sb);

+static inline struct timespec current_fs_time_sec(struct super_block *sb)
+{
+	return (struct timespec) { get_seconds(), 0 };
+}
+
 /*
  * Snapshotting support.
  */
-- 
1.9.1