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    Subject[PATCH 07/12] fs: btrfs: Use ktime_get_real_ts for root ctime
    Date
    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@gmail.com>
    Acked-by: David Sterba <dsterba@suse.com>
    Reviewed-by: Arnd Bergmann <arnd@arndb.de>
    ---
    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 a08224e..7d6bc30 100644
    --- a/fs/btrfs/root-tree.c
    +++ b/fs/btrfs/root-tree.c
    @@ -501,8 +501,9 @@ 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;

    + ktime_get_real_ts(&ct);
    spin_lock(&root->root_item_lock);
    btrfs_set_root_ctransid(item, trans->transid);
    btrfs_set_stack_timespec_sec(&item->ctime, ct.tv_sec);
    --
    2.7.4
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