linux-kernel - Re: [PATCH] quota: remove PRINT_QUOTA

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Message-ID: <20230413155705.cgmkdveu6gw7f7ii@quack3>
Date:   Thu, 13 Apr 2023 17:57:05 +0200
From:   Jan Kara <jack@...e.cz>
To:     Yangtao Li <frank.li@...o.com>
Cc:     Jan Kara <jack@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] quota: remove PRINT_QUOTA_WARNING support

On Thu 13-04-23 22:45:57, Yangtao Li wrote:
> It's deprecated since commit 8e8934695dfd ("quota: send messages
> via netlink"), so let's remove it. User should use notification via
> netlink socket instead.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>

Yeah, but frankly I'm not sure whether there are not people still relying
on this. In particular distributions still seem to enable this config
option in their kernels. So rather than removing this config right away, we
could maybe make it depend on CONFIG_BROKEN and see who complains...

								Honza

> diff --git a/fs/quota/Kconfig b/fs/quota/Kconfig
> index d5a85a8062d0..1b3bc0a99515 100644
> --- a/fs/quota/Kconfig
> +++ b/fs/quota/Kconfig
> @@ -26,16 +26,6 @@ config QUOTA_NETLINK_INTERFACE
>  	  hardlimit, etc.) will be reported through netlink interface. If unsure,
>  	  say Y.
>  
> -config PRINT_QUOTA_WARNING
> -	bool "Print quota warnings to console (OBSOLETE)"
> -	depends on QUOTA
> -	default y
> -	help
> -	  If you say Y here, quota warnings (about exceeding softlimit, reaching
> -	  hardlimit, etc.) will be printed to the process' controlling terminal.
> -	  Note that this behavior is currently deprecated and may go away in
> -	  future. Please use notification via netlink socket instead.
> -
>  config QUOTA_DEBUG
>  	bool "Additional quota sanity checks"
>  	depends on QUOTA
> diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
> index a6357f728034..10b46c403bdb 100644
> --- a/fs/quota/dquot.c
> +++ b/fs/quota/dquot.c
> @@ -154,7 +154,7 @@ void __quota_error(struct super_block *sb, const char *func,
>  }
>  EXPORT_SYMBOL(__quota_error);
>  
> -#if defined(CONFIG_QUOTA_DEBUG) || defined(CONFIG_PRINT_QUOTA_WARNING)
> +#if defined(CONFIG_QUOTA_DEBUG)
>  static char *quotatypes[] = INITQFNAMES;
>  #endif
>  static struct quota_format_type *quota_formats;	/* List of registered formats */
> @@ -1171,72 +1171,6 @@ static int warning_issued(struct dquot *dquot, const int warntype)
>  	return test_and_set_bit(flag, &dquot->dq_flags);
>  }
>  
> -#ifdef CONFIG_PRINT_QUOTA_WARNING
> -static int flag_print_warnings = 1;
> -
> -static int need_print_warning(struct dquot_warn *warn)
> -{
> -	if (!flag_print_warnings)
> -		return 0;
> -
> -	switch (warn->w_dq_id.type) {
> -		case USRQUOTA:
> -			return uid_eq(current_fsuid(), warn->w_dq_id.uid);
> -		case GRPQUOTA:
> -			return in_group_p(warn->w_dq_id.gid);
> -		case PRJQUOTA:
> -			return 1;
> -	}
> -	return 0;
> -}
> -
> -/* Print warning to user which exceeded quota */
> -static void print_warning(struct dquot_warn *warn)
> -{
> -	char *msg = NULL;
> -	struct tty_struct *tty;
> -	int warntype = warn->w_type;
> -
> -	if (warntype == QUOTA_NL_IHARDBELOW ||
> -	    warntype == QUOTA_NL_ISOFTBELOW ||
> -	    warntype == QUOTA_NL_BHARDBELOW ||
> -	    warntype == QUOTA_NL_BSOFTBELOW || !need_print_warning(warn))
> -		return;
> -
> -	tty = get_current_tty();
> -	if (!tty)
> -		return;
> -	tty_write_message(tty, warn->w_sb->s_id);
> -	if (warntype == QUOTA_NL_ISOFTWARN || warntype == QUOTA_NL_BSOFTWARN)
> -		tty_write_message(tty, ": warning, ");
> -	else
> -		tty_write_message(tty, ": write failed, ");
> -	tty_write_message(tty, quotatypes[warn->w_dq_id.type]);
> -	switch (warntype) {
> -		case QUOTA_NL_IHARDWARN:
> -			msg = " file limit reached.\r\n";
> -			break;
> -		case QUOTA_NL_ISOFTLONGWARN:
> -			msg = " file quota exceeded too long.\r\n";
> -			break;
> -		case QUOTA_NL_ISOFTWARN:
> -			msg = " file quota exceeded.\r\n";
> -			break;
> -		case QUOTA_NL_BHARDWARN:
> -			msg = " block limit reached.\r\n";
> -			break;
> -		case QUOTA_NL_BSOFTLONGWARN:
> -			msg = " block quota exceeded too long.\r\n";
> -			break;
> -		case QUOTA_NL_BSOFTWARN:
> -			msg = " block quota exceeded.\r\n";
> -			break;
> -	}
> -	tty_write_message(tty, msg);
> -	tty_kref_put(tty);
> -}
> -#endif
> -
>  static void prepare_warning(struct dquot_warn *warn, struct dquot *dquot,
>  			    int warntype)
>  {
> @@ -1259,9 +1193,6 @@ static void flush_warnings(struct dquot_warn *warn)
>  	for (i = 0; i < MAXQUOTAS; i++) {
>  		if (warn[i].w_type == QUOTA_NL_NOWARN)
>  			continue;
> -#ifdef CONFIG_PRINT_QUOTA_WARNING
> -		print_warning(&warn[i]);
> -#endif
>  		quota_send_warning(warn[i].w_dq_id,
>  				   warn[i].w_sb->s_dev, warn[i].w_type);
>  	}
> @@ -2936,15 +2867,6 @@ static struct ctl_table fs_dqstats_table[] = {
>  		.mode		= 0444,
>  		.proc_handler	= do_proc_dqstats,
>  	},
> -#ifdef CONFIG_PRINT_QUOTA_WARNING
> -	{
> -		.procname	= "warnings",
> -		.data		= &flag_print_warnings,
> -		.maxlen		= sizeof(int),
> -		.mode		= 0644,
> -		.proc_handler	= proc_dointvec,
> -	},
> -#endif
>  	{ },
>  };
>  
> -- 
> 2.35.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR