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SubjectRe: [PATCH] ext4: Convert timers to use timer_setup()
On Wed 04-10-17 17:52:54, Kees Cook wrote:
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly.
>
> Cc: "Theodore Ts'o" <tytso@mit.edu>
> Cc: Andreas Dilger <adilger.kernel@dilger.ca>
> Cc: linux-ext4@vger.kernel.org
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: Kees Cook <keescook@chromium.org>

The patch looks good. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

Honza


> ---
> This requires commit 686fef928bba ("timer: Prepare to change timer
> callback argument type") in v4.14-rc3, but should be otherwise
> stand-alone.
> ---
> fs/ext4/super.c | 14 +++++---------
> 1 file changed, 5 insertions(+), 9 deletions(-)
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index b104096fce9e..1bc7ff8157d8 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -2791,14 +2791,11 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
> * This function is called once a day if we have errors logged
> * on the file system
> */
> -static void print_daily_error_info(unsigned long arg)
> +static void print_daily_error_info(struct timer_list *t)
> {
> - struct super_block *sb = (struct super_block *) arg;
> - struct ext4_sb_info *sbi;
> - struct ext4_super_block *es;
> -
> - sbi = EXT4_SB(sb);
> - es = sbi->s_es;
> + struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
> + struct super_block *sb = sbi->s_sb;
> + struct ext4_super_block *es = sbi->s_es;
>
> if (es->s_error_count)
> /* fsck newer than v1.41.13 is needed to clean this condition. */
> @@ -3980,8 +3977,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> get_random_bytes(&sbi->s_next_generation, sizeof(u32));
> spin_lock_init(&sbi->s_next_gen_lock);
>
> - setup_timer(&sbi->s_err_report, print_daily_error_info,
> - (unsigned long) sb);
> + timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
>
> /* Register extent status tree shrinker */
> if (ext4_es_register_shrinker(sbi))
> --
> 2.7.4
>
>
> --
> Kees Cook
> Pixel Security
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

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