linux-kernel - [PATCH 18/21] fs: nfs: Make nfs boot time y2038 safe

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Date:	Wed,  8 Jun 2016 22:05:02 -0700
From:	Deepa Dinamani <deepa.kernel@...il.com>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	y2038@...ts.linaro.org,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	linux-nfs@...r.kernel.org
Subject: [PATCH 18/21] fs: nfs: Make nfs boot time y2038 safe

boot_time is represented as a struct timespec.
struct timespec and CURRENT_TIME are not y2038 safe.
Overall, the plan is to use timespec64 for all internal
kernel representation of timestamps.
CURRENT_TIME will also be removed.
Use struct timespec64 to represent boot_time.
And, ktime_get_real_ts64() for the boot_time value.

boot_time is used to construct the nfs client boot verifier.
This will now wrap in 2106 instead of 2038 on 32-bit systems.
The server only relies on the value being persistent until
reboot so the wrapping should be fine.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
Cc: Trond Myklebust <trond.myklebust@...marydata.com>
Cc: Anna Schumaker <anna.schumaker@...app.com>
Cc: linux-nfs@...r.kernel.org
---
 fs/nfs/client.c | 2 +-
 fs/nfs/netns.h  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 0c96528..406972e 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -1080,7 +1080,7 @@ void nfs_clients_init(struct net *net)
 	idr_init(&nn->cb_ident_idr);
 #endif
 	spin_lock_init(&nn->nfs_client_lock);
-	nn->boot_time = CURRENT_TIME;
+	ktime_get_real_ts64(&nn->boot_time);
 }
 
 #ifdef CONFIG_PROC_FS
diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h
index f0e06e4..48d6b95 100644
--- a/fs/nfs/netns.h
+++ b/fs/nfs/netns.h
@@ -29,7 +29,7 @@ struct nfs_net {
 	int cb_users[NFS4_MAX_MINOR_VERSION + 1];
 #endif
 	spinlock_t nfs_client_lock;
-	struct timespec boot_time;
+	struct timespec64 boot_time;
 #ifdef CONFIG_PROC_FS
 	struct proc_dir_entry *proc_nfsfs;
 #endif
-- 
1.9.1