[PATCH v3 2/2] xfs: quota: move to time64_t interfaces

[Arnd Bergmann <arnd@arndb.de>]

As a preparation for removing the 32-bit time_t type and
all associated interfaces, change xfs to use time64_t and
ktime_get_real_seconds() for the quota housekeeping.

This avoids one difference between 32-bit and 64-bit kernels,
raising the theoretical limit for the quota grace period
to year 2106 on 32-bit instead of year 2038.

Note that common user space tools using the XFS quotactl
interface instead of the generic one still use the y2038
dates.

To fix quotas properly, both the on-disk format and user
space still need to be changed.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
This has a small conflict against the series at
https://www.spinics.net/lists/linux-xfs/msg35409.html
("xfs: widen timestamps to deal with y2038") which needs
to be rebased on top of this.

All other changes to remove time_t and get_seconds()
are now in linux-next, this is one of the last patches
needed to remove their definitions for v5.6.

If the widened timestamps make it into v5.6, this patch
can be dropped.
---
 fs/xfs/xfs_dquot.c       | 6 +++---
 fs/xfs/xfs_qm.h          | 6 +++---
 fs/xfs/xfs_quotaops.c    | 6 +++---
 fs/xfs/xfs_trans_dquot.c | 8 +++++---
 4 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index 2bff21ca9d78..9cfd3209f52b 100644
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -137,7 +137,7 @@ xfs_qm_adjust_dqtimers(
 		    (d->d_blk_hardlimit &&
 		     (be64_to_cpu(d->d_bcount) >
 		      be64_to_cpu(d->d_blk_hardlimit)))) {
-			d->d_btimer = cpu_to_be32(get_seconds() +
+			d->d_btimer = cpu_to_be32(ktime_get_real_seconds() +
 					mp->m_quotainfo->qi_btimelimit);
 		} else {
 			d->d_bwarns = 0;
@@ -160,7 +160,7 @@ xfs_qm_adjust_dqtimers(
 		    (d->d_ino_hardlimit &&
 		     (be64_to_cpu(d->d_icount) >
 		      be64_to_cpu(d->d_ino_hardlimit)))) {
-			d->d_itimer = cpu_to_be32(get_seconds() +
+			d->d_itimer = cpu_to_be32(ktime_get_real_seconds() +
 					mp->m_quotainfo->qi_itimelimit);
 		} else {
 			d->d_iwarns = 0;
@@ -183,7 +183,7 @@ xfs_qm_adjust_dqtimers(
 		    (d->d_rtb_hardlimit &&
 		     (be64_to_cpu(d->d_rtbcount) >
 		      be64_to_cpu(d->d_rtb_hardlimit)))) {
-			d->d_rtbtimer = cpu_to_be32(get_seconds() +
+			d->d_rtbtimer = cpu_to_be32(ktime_get_real_seconds() +
 					mp->m_quotainfo->qi_rtbtimelimit);
 		} else {
 			d->d_rtbwarns = 0;
diff --git a/fs/xfs/xfs_qm.h b/fs/xfs/xfs_qm.h
index 7823af39008b..4e57edca8bce 100644
--- a/fs/xfs/xfs_qm.h
+++ b/fs/xfs/xfs_qm.h
@@ -64,9 +64,9 @@ struct xfs_quotainfo {
 	struct xfs_inode	*qi_pquotaip;	/* project quota inode */
 	struct list_lru	 qi_lru;
 	int		 qi_dquots;
-	time_t		 qi_btimelimit;	 /* limit for blks timer */
-	time_t		 qi_itimelimit;	 /* limit for inodes timer */
-	time_t		 qi_rtbtimelimit;/* limit for rt blks timer */
+	time64_t	 qi_btimelimit;	 /* limit for blks timer */
+	time64_t	 qi_itimelimit;	 /* limit for inodes timer */
+	time64_t	 qi_rtbtimelimit;/* limit for rt blks timer */
 	xfs_qwarncnt_t	 qi_bwarnlimit;	 /* limit for blks warnings */
 	xfs_qwarncnt_t	 qi_iwarnlimit;	 /* limit for inodes warnings */
 	xfs_qwarncnt_t	 qi_rtbwarnlimit;/* limit for rt blks warnings */
diff --git a/fs/xfs/xfs_quotaops.c b/fs/xfs/xfs_quotaops.c
index c7de17deeae6..38669e827206 100644
--- a/fs/xfs/xfs_quotaops.c
+++ b/fs/xfs/xfs_quotaops.c
@@ -37,9 +37,9 @@ xfs_qm_fill_state(
 	tstate->flags |= QCI_SYSFILE;
 	tstate->blocks = ip->i_d.di_nblocks;
 	tstate->nextents = ip->i_d.di_nextents;
-	tstate->spc_timelimit = q->qi_btimelimit;
-	tstate->ino_timelimit = q->qi_itimelimit;
-	tstate->rt_spc_timelimit = q->qi_rtbtimelimit;
+	tstate->spc_timelimit = (u32)q->qi_btimelimit;
+	tstate->ino_timelimit = (u32)q->qi_itimelimit;
+	tstate->rt_spc_timelimit = (u32)q->qi_rtbtimelimit;
 	tstate->spc_warnlimit = q->qi_bwarnlimit;
 	tstate->ino_warnlimit = q->qi_iwarnlimit;
 	tstate->rt_spc_warnlimit = q->qi_rtbwarnlimit;
diff --git a/fs/xfs/xfs_trans_dquot.c b/fs/xfs/xfs_trans_dquot.c
index a6fe2d8dc40f..d1b9869bc5fa 100644
--- a/fs/xfs/xfs_trans_dquot.c
+++ b/fs/xfs/xfs_trans_dquot.c
@@ -580,7 +580,7 @@ xfs_trans_dqresv(
 {
 	xfs_qcnt_t		hardlimit;
 	xfs_qcnt_t		softlimit;
-	time_t			timer;
+	time64_t		timer;
 	xfs_qwarncnt_t		warns;
 	xfs_qwarncnt_t		warnlimit;
 	xfs_qcnt_t		total_count;
@@ -635,7 +635,8 @@ xfs_trans_dqresv(
 				goto error_return;
 			}
 			if (softlimit && total_count > softlimit) {
-				if ((timer != 0 && get_seconds() > timer) ||
+				if ((timer != 0 &&
+				     ktime_get_real_seconds() > timer) ||
 				    (warns != 0 && warns >= warnlimit)) {
 					xfs_quota_warn(mp, dqp,
 						       QUOTA_NL_BSOFTLONGWARN);
@@ -662,7 +663,8 @@ xfs_trans_dqresv(
 				goto error_return;
 			}
 			if (softlimit && total_count > softlimit) {
-				if  ((timer != 0 && get_seconds() > timer) ||
+				if  ((timer != 0 &&
+				      ktime_get_real_seconds() > timer) ||
 				     (warns != 0 && warns >= warnlimit)) {
 					xfs_quota_warn(mp, dqp,
 						       QUOTA_NL_ISOFTLONGWARN);
-- 
2.20.0