linux-kernel - Re: [PATCH 3/7] fs: cifs: Delete usage of timespec64

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Date:   Sat, 30 Nov 2019 15:25:39 -0600
From:   Steve French <smfrench@...il.com>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Steve French <stfrench@...rosoft.com>,
        CIFS <linux-cifs@...r.kernel.org>
Subject: Re: [PATCH 3/7] fs: cifs: Delete usage of timespec64_trunc

Is this intended to merge separately or do you want it merged through
the cifs git tree?

On Fri, Nov 29, 2019 at 11:33 PM Deepa Dinamani <deepa.kernel@...il.com> wrote:
>
> timestamp_truncate() is the replacement api for
> timespec64_trunc. timestamp_truncate() additionally clamps
> timestamps to make sure the timestamps lie within the
> permitted range for the filesystem.
>
> Truncate the timestamps in the struct cifs_attr at the
> site of assignment to inode times. This
> helps us use the right fs api timestamp_trucate() to
> perform the truncation.
>
> Also update the ktime_get_* api to match the one used in
> current_time(). This allows for timestamps to be updated
> the same way always.
>
> Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
> Cc: stfrench@...rosoft.com
> Cc: linux-cifs@...r.kernel.org
> ---
>  fs/cifs/inode.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
> index ca76a9287456..026ed49e8aa4 100644
> --- a/fs/cifs/inode.c
> +++ b/fs/cifs/inode.c
> @@ -113,6 +113,7 @@ cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
>         }
>
>          /* revalidate if mtime or size have changed */
> +       fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
>         if (timespec64_equal(&inode->i_mtime, &fattr->cf_mtime) &&
>             cifs_i->server_eof == fattr->cf_eof) {
>                 cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
> @@ -162,6 +163,9 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
>         cifs_revalidate_cache(inode, fattr);
>
>         spin_lock(&inode->i_lock);
> +       fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
> +       fattr->cf_atime = timestamp_truncate(fattr->cf_atime, inode);
> +       fattr->cf_ctime = timestamp_truncate(fattr->cf_ctime, inode);
>         /* we do not want atime to be less than mtime, it broke some apps */
>         if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0)
>                 inode->i_atime = fattr->cf_mtime;
> @@ -329,8 +333,7 @@ cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
>         fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
>         fattr->cf_uid = cifs_sb->mnt_uid;
>         fattr->cf_gid = cifs_sb->mnt_gid;
> -       ktime_get_real_ts64(&fattr->cf_mtime);
> -       fattr->cf_mtime = timespec64_trunc(fattr->cf_mtime, sb->s_time_gran);
> +       ktime_get_coarse_real_ts64(&fattr->cf_mtime);
>         fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
>         fattr->cf_nlink = 2;
>         fattr->cf_flags = CIFS_FATTR_DFS_REFERRAL;
> @@ -609,10 +612,8 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
>
>         if (info->LastAccessTime)
>                 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
> -       else {
> -               ktime_get_real_ts64(&fattr->cf_atime);
> -               fattr->cf_atime = timespec64_trunc(fattr->cf_atime, sb->s_time_gran);
> -       }
> +       else
> +               ktime_get_coarse_real_ts64(&fattr->cf_atime);
>
>         fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
>         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
> --
> 2.17.1
>


-- 
Thanks,

Steve