linux-kernel - [PATCH v2 08/24] fs: btrfs: Use ktime_get_real

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Message-Id: <1466382443-11063-9-git-send-email-deepa.kernel@gmail.com>
Date:	Sun, 19 Jun 2016 17:27:07 -0700
From:	Deepa Dinamani <deepa.kernel@...il.com>
To:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	arnd@...db.de, tglx@...utronix.de, torvalds@...ux-foundation.org,
	tytso@....edu, viro@...iv.linux.org.uk, y2038@...ts.linaro.org,
	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org
Subject: [PATCH v2 08/24] fs: btrfs: Use ktime_get_real_ts for root ctime

btrfs_root_item maintains the ctime for root updates.
This is not part of vfs_inode.

Since current_time() uses struct inode* as an argument
as Linus suggested, this cannot be used to update root
times unless, we modify the signature to use inode.

Since btrfs uses nanosecond time granularity, it can also
use ktime_get_real_ts directly to obtain timestamp for
the root. It is necessary to use the timespec time api
here because the same btrfs_set_stack_timespec_*() apis
are used for vfs inode times as well. These can be
transitioned to using timespec64 when btrfs internally
changes to use timespec64 as well.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
Cc: Chris Mason <clm@...com>
Cc: Josef Bacik <jbacik@...com>
Cc: David Sterba <dsterba@...e.com>
Cc: linux-btrfs@...r.kernel.org
---
 fs/btrfs/root-tree.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index f1c3086..161118b 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -496,10 +496,11 @@ void btrfs_update_root_times(struct btrfs_trans_handle *trans,
 			     struct btrfs_root *root)
 {
 	struct btrfs_root_item *item = &root->root_item;
-	struct timespec ct = current_fs_time(root->fs_info->sb);
+	struct timespec ct;
 
 	spin_lock(&root->root_item_lock);
 	btrfs_set_root_ctransid(item, trans->transid);
+	ktime_get_real_ts(&ct);
 	btrfs_set_stack_timespec_sec(&item->ctime, ct.tv_sec);
 	btrfs_set_stack_timespec_nsec(&item->ctime, ct.tv_nsec);
 	spin_unlock(&root->root_item_lock);
-- 
1.9.1