linux-kernel - Re: [PATCH] fat: fix mtime handing in __fat_write

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Message-ID: <CABq1_vhoWrKuDkdogeHufnPn68k9RLsRiZM6H8fp-zoTwnvd_Q@mail.gmail.com>
Date:   Wed, 18 Oct 2023 13:44:23 +0200
From:   Klara Modin <klarasmodin@...il.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Christian Brauner <brauner@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] fat: fix mtime handing in __fat_write_inode

I can confirm that this patch fixes the issue, thanks!

Den ons 18 okt. 2023 kl 13:15 skrev Jeff Layton <jlayton@...nel.org>:
>
> Klara reported seeing mangled mtimes when dealing with FAT. Fix the
> braino in the FAT conversion to the new timestamp accessors.
>
> Fixes: e57260ae3226 (fat: convert to new timestamp accessors)
> Reported-by: Klara Modin <klarasmodin@...il.com>
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
> ---
> This patch fixes the bug that Klara reported late yesterday. The issue
> is a bad by-hand conversion of __fat_write_inode to the new timestamp
> accessor functions.
>
> Christian, this patch should probably be squashed into e57260ae3226.
>
> Thanks!
> Jeff
> ---
>  fs/fat/inode.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/fat/inode.c b/fs/fat/inode.c
> index aa87f323fd44..1fac3dabf130 100644
> --- a/fs/fat/inode.c
> +++ b/fs/fat/inode.c
> @@ -888,9 +888,9 @@ static int __fat_write_inode(struct inode *inode, int wait)
>                 raw_entry->size = cpu_to_le32(inode->i_size);
>         raw_entry->attr = fat_make_attrs(inode);
>         fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart);
> +       mtime = inode_get_mtime(inode);
>         fat_time_unix2fat(sbi, &mtime, &raw_entry->time,
>                           &raw_entry->date, NULL);
> -       inode_set_mtime_to_ts(inode, mtime);
>         if (sbi->options.isvfat) {
>                 struct timespec64 ts = inode_get_atime(inode);
>                 __le16 atime;
>
> ---
> base-commit: fea0e8fc7829dc85f82c8a1a8249630f6fb85553
> change-id: 20231018-amtime-24d2effcc9a9
>
> Best regards,
> --
> Jeff Layton <jlayton@...nel.org>
>