linux-ext4 - Re: [PATCH v2 1/2] ext4: add helpers for checking whether quota can be enabled/is journalled

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Date:   Mon, 19 Oct 2020 11:53:28 +0200
From:   Jan Kara <jack@...e.cz>
To:     Roman Anufriev <dotdot@...dex-team.ru>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu, jack@...e.cz,
        dmtrmonakhov@...dex-team.ru
Subject: Re: [PATCH v2 1/2] ext4: add helpers for checking whether quota can
 be enabled/is journalled

On Mon 19-10-20 11:37:06, Jan Kara wrote:
> On Sun 18-10-20 05:02:26, Roman Anufriev wrote:
> > Right now, there are several places, where we check whether fs is
> > capable of enabling quota or if quota is journalled with quite long
> > and non-self-descriptive condition statements.
> > 
> > This patch wraps these statements into helpers for better readability
> > and easier usage.
> > 
> > Signed-off-by: Roman Anufriev <dotdot@...dex-team.ru>
> 
> Looks good to me. You can add:
> 
> Reviewe-by: Jan Kara <jack@...e.cz>

Now I've realized that if we run in nojournal mode, quota won't be
journalled in any case. Probably not a configuration you run in but still
we should get that right.


 								Honza

> > ---
> > Changes in v2:
> >   - Fix misleading helper name 'ext4_any_quota_enabled()' ->
> >     'ext4_quota_capable()'.
> > 
> >  fs/ext4/ext4.h      | 15 +++++++++++++++
> >  fs/ext4/ext4_jbd2.h |  9 +++------
> >  fs/ext4/super.c     |  5 +----
> >  3 files changed, 19 insertions(+), 10 deletions(-)
> > 
> > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> > index 250e905..897df24 100644
> > --- a/fs/ext4/ext4.h
> > +++ b/fs/ext4/ext4.h
> > @@ -3251,6 +3251,21 @@ static inline void ext4_unlock_group(struct super_block *sb,
> >  	spin_unlock(ext4_group_lock_ptr(sb, group));
> >  }
> >  
> > +#ifdef CONFIG_QUOTA
> > +static inline bool ext4_quota_capable(struct super_block *sb)
> > +{
> > +	return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
> > +}
> > +
> > +static inline bool ext4_is_quota_journalled(struct super_block *sb)
> > +{
> > +	struct ext4_sb_info *sbi = EXT4_SB(sb);
> > +
> > +	return (ext4_has_feature_quota(sb) ||
> > +		sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
> > +}
> > +#endif
> > +
> >  /*
> >   * Block validity checking
> >   */
> > diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
> > index 00dc668..a124c68 100644
> > --- a/fs/ext4/ext4_jbd2.h
> > +++ b/fs/ext4/ext4_jbd2.h
> > @@ -86,17 +86,14 @@
> >  #ifdef CONFIG_QUOTA
> >  /* Amount of blocks needed for quota update - we know that the structure was
> >   * allocated so we need to update only data block */
> > -#define EXT4_QUOTA_TRANS_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
> > -		ext4_has_feature_quota(sb)) ? 1 : 0)
> > +#define EXT4_QUOTA_TRANS_BLOCKS(sb) ((ext4_quota_capable(sb)) ? 1 : 0)
> >  /* Amount of blocks needed for quota insert/delete - we do some block writes
> >   * but inode, sb and group updates are done only once */
> > -#define EXT4_QUOTA_INIT_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
> > -		ext4_has_feature_quota(sb)) ?\
> > +#define EXT4_QUOTA_INIT_BLOCKS(sb) ((ext4_quota_capable(sb)) ?\
> >  		(DQUOT_INIT_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\
> >  		 +3+DQUOT_INIT_REWRITE) : 0)
> >  
> > -#define EXT4_QUOTA_DEL_BLOCKS(sb) ((test_opt(sb, QUOTA) ||\
> > -		ext4_has_feature_quota(sb)) ?\
> > +#define EXT4_QUOTA_DEL_BLOCKS(sb) ((ext4_quota_capable(sb)) ?\
> >  		(DQUOT_DEL_ALLOC*(EXT4_SINGLEDATA_TRANS_BLOCKS(sb)-3)\
> >  		 +3+DQUOT_DEL_REWRITE) : 0)
> >  #else
> > diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> > index 9d01318..a988cf3 100644
> > --- a/fs/ext4/super.c
> > +++ b/fs/ext4/super.c
> > @@ -6158,11 +6158,8 @@ static int ext4_release_dquot(struct dquot *dquot)
> >  static int ext4_mark_dquot_dirty(struct dquot *dquot)
> >  {
> >  	struct super_block *sb = dquot->dq_sb;
> > -	struct ext4_sb_info *sbi = EXT4_SB(sb);
> >  
> > -	/* Are we journaling quotas? */
> > -	if (ext4_has_feature_quota(sb) ||
> > -	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
> > +	if (ext4_is_quota_journalled(sb)) {
> >  		dquot_mark_dquot_dirty(dquot);
> >  		return ext4_write_dquot(dquot);
> >  	} else {
> > -- 
> > 2.7.4
> > 
> -- 
> Jan Kara <jack@...e.com>
> SUSE Labs, CR
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR