xfs: remove quota warning limit from struct xfs_quota_limits

Warning limits in xfs quota is an unused feature that is currently
documented as unimplemented, and it is unclear what the intended
behavior of these limits are. Remove the ‘warn’ field from struct
xfs_quota_limits and any other related code.

Signed-off-by: Catherine Hoang <[e-mail]>
Reviewed-by: Allison Henderson <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
Signed-off-by: Dave Chinner <[e-mail]>

fs/xfs/xfs_qm.c

···
 	defq->blk.time = XFS_QM_BTIMELIMIT;
 	defq->ino.time = XFS_QM_ITIMELIMIT;
 	defq->rtb.time = XFS_QM_RTBTIMELIMIT;
-	defq->blk.warn = XFS_QM_BWARNLIMIT;
-	defq->ino.warn = XFS_QM_IWARNLIMIT;
-	defq->rtb.warn = XFS_QM_RTBWARNLIMIT;
 
 	/*
 	 * We try to get the limits from the superuser's limits fields.
···
 		defq->ino.time = dqp->q_ino.timer;
 	if (dqp->q_rtb.timer)
 		defq->rtb.time = dqp->q_rtb.timer;
-	if (dqp->q_blk.warnings)
-		defq->blk.warn = dqp->q_blk.warnings;
-	if (dqp->q_ino.warnings)
-		defq->ino.warn = dqp->q_ino.warnings;
-	if (dqp->q_rtb.warnings)
-		defq->rtb.warn = dqp->q_rtb.warnings;
 
 	xfs_qm_dqdestroy(dqp);
 }

fs/xfs/xfs_qm.h

···
 	xfs_qcnt_t		hard;	/* default hard limit */
 	xfs_qcnt_t		soft;	/* default soft limit */
 	time64_t		time;	/* limit for timers */
-	xfs_qwarncnt_t		warn;	/* limit for warnings */
 };
 
 /* Defaults for each quota type: time limits, warn limits, usage limits */
···
 #define XFS_QM_BTIMELIMIT	(7 * 24*60*60)          /* 1 week */
 #define XFS_QM_RTBTIMELIMIT	(7 * 24*60*60)          /* 1 week */
 #define XFS_QM_ITIMELIMIT	(7 * 24*60*60)          /* 1 week */
-
-#define XFS_QM_BWARNLIMIT	5
-#define XFS_QM_IWARNLIMIT	5
-#define XFS_QM_RTBWARNLIMIT	5
 
 extern void		xfs_qm_destroy_quotainfo(struct xfs_mount *);
 

fs/xfs/xfs_qm_syscalls.c

···
 }
 
 static inline void
-xfs_setqlim_warns(
-	struct xfs_dquot_res	*res,
-	struct xfs_quota_limits	*qlim,
-	int			warns)
-{
-	res->warnings = warns;
-	if (qlim)
-		qlim->warn = warns;
-}
-
-static inline void
 xfs_setqlim_timer(
 	struct xfs_mount	*mp,
 	struct xfs_dquot_res	*res,
···
 	if (xfs_setqlim_limits(mp, res, qlim, hard, soft, "blk"))
 		xfs_dquot_set_prealloc_limits(dqp);
 	if (newlim->d_fieldmask & QC_SPC_WARNS)
-		xfs_setqlim_warns(res, qlim, newlim->d_spc_warns);
+		res->warnings = newlim->d_spc_warns;
 	if (newlim->d_fieldmask & QC_SPC_TIMER)
 		xfs_setqlim_timer(mp, res, qlim, newlim->d_spc_timer);
 
···
 
 	xfs_setqlim_limits(mp, res, qlim, hard, soft, "rtb");
 	if (newlim->d_fieldmask & QC_RT_SPC_WARNS)
-		xfs_setqlim_warns(res, qlim, newlim->d_rt_spc_warns);
+		res->warnings = newlim->d_rt_spc_warns;
 	if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
 		xfs_setqlim_timer(mp, res, qlim, newlim->d_rt_spc_timer);
 
···
 
 	xfs_setqlim_limits(mp, res, qlim, hard, soft, "ino");
 	if (newlim->d_fieldmask & QC_INO_WARNS)
-		xfs_setqlim_warns(res, qlim, newlim->d_ino_warns);
+		res->warnings = newlim->d_ino_warns;
 	if (newlim->d_fieldmask & QC_INO_TIMER)
 		xfs_setqlim_timer(mp, res, qlim, newlim->d_ino_timer);
 

fs/xfs/xfs_quotaops.c

···
 	tstate->spc_timelimit = (u32)defq->blk.time;
 	tstate->ino_timelimit = (u32)defq->ino.time;
 	tstate->rt_spc_timelimit = (u32)defq->rtb.time;
-	tstate->spc_warnlimit = defq->blk.warn;
-	tstate->ino_warnlimit = defq->ino.warn;
-	tstate->rt_spc_warnlimit = defq->rtb.warn;
+	tstate->spc_warnlimit = 0;
+	tstate->ino_warnlimit = 0;
+	tstate->rt_spc_warnlimit = 0;
 	if (tempqip)
 		xfs_irele(ip);
 }

fs/xfs/xfs_trans_dquot.c

···
 	if (softlimit && total_count > softlimit) {
 		time64_t	now = ktime_get_real_seconds();
 
-		if ((res->timer != 0 && now > res->timer) ||
-		    (res->warnings != 0 && res->warnings >= qlim->warn)) {
+		if (res->timer != 0 && now > res->timer) {
 			*fatal = true;
 			return QUOTA_NL_ISOFTLONGWARN;
 		}