linux-kernel - Re: [RFC PATCH V6 5/7] fs: export wait_sb

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Date:   Fri, 26 Nov 2021 10:20:47 +0100
From:   Jan Kara <jack@...e.cz>
To:     Chengguang Xu <cgxu519@...ernel.net>
Cc:     miklos@...redi.hu, jack@...e.cz, amir73il@...il.com,
        linux-unionfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chengguang Xu <charliecgxu@...cent.com>
Subject: Re: [RFC PATCH V6 5/7] fs: export wait_sb_inodes()

On Mon 22-11-21 11:00:36, Chengguang Xu wrote:
> From: Chengguang Xu <charliecgxu@...cent.com>
> 
> In order to wait syncing upper inodes we need to
> call wait_sb_inodes() in overlayfs' ->sync_fs.
> 
> Signed-off-by: Chengguang Xu <charliecgxu@...cent.com>

Looks good. Feel free to add:

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

								Honza

> ---
>  fs/fs-writeback.c         | 3 ++-
>  include/linux/writeback.h | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 81ec192ce067..0438c911241e 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -2505,7 +2505,7 @@ EXPORT_SYMBOL(__mark_inode_dirty);
>   * completed by the time we have gained the lock and waited for all IO that is
>   * in progress regardless of the order callers are granted the lock.
>   */
> -static void wait_sb_inodes(struct super_block *sb)
> +void wait_sb_inodes(struct super_block *sb)
>  {
>  	LIST_HEAD(sync_list);
>  
> @@ -2589,6 +2589,7 @@ static void wait_sb_inodes(struct super_block *sb)
>  	rcu_read_unlock();
>  	mutex_unlock(&sb->s_sync_lock);
>  }
> +EXPORT_SYMBOL(wait_sb_inodes);
>  
>  static void __writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr,
>  				     enum wb_reason reason, bool skip_if_busy)
> diff --git a/include/linux/writeback.h b/include/linux/writeback.h
> index d1f65adf6a26..d7aacd0434cf 100644
> --- a/include/linux/writeback.h
> +++ b/include/linux/writeback.h
> @@ -198,6 +198,7 @@ void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
>  				enum wb_reason reason);
>  void inode_wait_for_writeback(struct inode *inode);
>  void inode_io_list_del(struct inode *inode);
> +void wait_sb_inodes(struct super_block *sb);
>  
>  /* writeback.h requires fs.h; it, too, is not included from here. */
>  static inline void wait_on_inode(struct inode *inode)
> -- 
> 2.27.0
> 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR