linux-ext4 - Re: [PATCH v3 1/2] ext4: rename s_journal_flag_rwsem to s_writepages

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Date:   Thu, 20 Feb 2020 10:14:58 +0100
From:   Jan Kara <jack@...e.cz>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v3 1/2] ext4: rename s_journal_flag_rwsem to
 s_writepages_rwsem

On Wed 19-02-20 10:30:46, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> In preparation for making s_journal_flag_rwsem synchronize
> ext4_writepages() with changes to both the EXTENTS and JOURNAL_DATA
> flags (rather than just JOURNAL_DATA as it does currently), rename it to
> s_writepages_rwsem.
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

The patch looks good to me. You can add:

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

								Honza

> ---
>  fs/ext4/ext4.h  |  2 +-
>  fs/ext4/inode.c | 14 +++++++-------
>  fs/ext4/super.c |  6 +++---
>  3 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 4441331d06cc4..487a7b430b9dd 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1553,7 +1553,7 @@ struct ext4_sb_info {
>  	struct ratelimit_state s_msg_ratelimit_state;
>  
>  	/* Barrier between changing inodes' journal flags and writepages ops. */
> -	struct percpu_rw_semaphore s_journal_flag_rwsem;
> +	struct percpu_rw_semaphore s_writepages_rwsem;
>  	struct dax_device *s_daxdev;
>  #ifdef CONFIG_EXT4_DEBUG
>  	unsigned long s_simulate_fail;
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index c04a15fc8b6ad..f49c48ea2f170 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2628,7 +2628,7 @@ static int ext4_writepages(struct address_space *mapping,
>  	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
>  		return -EIO;
>  
> -	percpu_down_read(&sbi->s_journal_flag_rwsem);
> +	percpu_down_read(&sbi->s_writepages_rwsem);
>  	trace_ext4_writepages(inode, wbc);
>  
>  	/*
> @@ -2849,7 +2849,7 @@ static int ext4_writepages(struct address_space *mapping,
>  out_writepages:
>  	trace_ext4_writepages_result(inode, wbc, ret,
>  				     nr_to_write - wbc->nr_to_write);
> -	percpu_up_read(&sbi->s_journal_flag_rwsem);
> +	percpu_up_read(&sbi->s_writepages_rwsem);
>  	return ret;
>  }
>  
> @@ -2864,13 +2864,13 @@ static int ext4_dax_writepages(struct address_space *mapping,
>  	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
>  		return -EIO;
>  
> -	percpu_down_read(&sbi->s_journal_flag_rwsem);
> +	percpu_down_read(&sbi->s_writepages_rwsem);
>  	trace_ext4_writepages(inode, wbc);
>  
>  	ret = dax_writeback_mapping_range(mapping, inode->i_sb->s_bdev, wbc);
>  	trace_ext4_writepages_result(inode, wbc, ret,
>  				     nr_to_write - wbc->nr_to_write);
> -	percpu_up_read(&sbi->s_journal_flag_rwsem);
> +	percpu_up_read(&sbi->s_writepages_rwsem);
>  	return ret;
>  }
>  
> @@ -5861,7 +5861,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
>  		}
>  	}
>  
> -	percpu_down_write(&sbi->s_journal_flag_rwsem);
> +	percpu_down_write(&sbi->s_writepages_rwsem);
>  	jbd2_journal_lock_updates(journal);
>  
>  	/*
> @@ -5878,7 +5878,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
>  		err = jbd2_journal_flush(journal);
>  		if (err < 0) {
>  			jbd2_journal_unlock_updates(journal);
> -			percpu_up_write(&sbi->s_journal_flag_rwsem);
> +			percpu_up_write(&sbi->s_writepages_rwsem);
>  			return err;
>  		}
>  		ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA);
> @@ -5886,7 +5886,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
>  	ext4_set_aops(inode);
>  
>  	jbd2_journal_unlock_updates(journal);
> -	percpu_up_write(&sbi->s_journal_flag_rwsem);
> +	percpu_up_write(&sbi->s_writepages_rwsem);
>  
>  	if (val)
>  		up_write(&EXT4_I(inode)->i_mmap_sem);
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index b0b9150c97735..feb59c7ad395f 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1054,7 +1054,7 @@ static void ext4_put_super(struct super_block *sb)
>  	percpu_counter_destroy(&sbi->s_freeinodes_counter);
>  	percpu_counter_destroy(&sbi->s_dirs_counter);
>  	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
> -	percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
> +	percpu_free_rwsem(&sbi->s_writepages_rwsem);
>  #ifdef CONFIG_QUOTA
>  	for (i = 0; i < EXT4_MAXQUOTAS; i++)
>  		kfree(get_qf_name(sb, sbi, i));
> @@ -4600,7 +4600,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
>  		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
>  					  GFP_KERNEL);
>  	if (!err)
> -		err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
> +		err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
>  
>  	if (err) {
>  		ext4_msg(sb, KERN_ERR, "insufficient memory");
> @@ -4694,7 +4694,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
>  	percpu_counter_destroy(&sbi->s_freeinodes_counter);
>  	percpu_counter_destroy(&sbi->s_dirs_counter);
>  	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
> -	percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
> +	percpu_free_rwsem(&sbi->s_writepages_rwsem);
>  failed_mount5:
>  	ext4_ext_release(sb);
>  	ext4_release_system_zone(sb);
> 
> base-commit: c96dceeabf765d0b1b1f29c3bf50a5c01315b820
> -- 
> 2.25.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR