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quota: widen timestamps for the fs_disk_quota structure 

Soon, XFS will support quota grace period expiration timestamps beyond
the year 2038, widen the timestamp fields to handle the extra time bits.
Internally, XFS now stores unsigned 34-bit quantities, so the extra 8
bits here should work fine.  (Note that XFS is the only user of this
structure.)

Link: https://lore.kernel.org/r/20200909163413.GJ7955@magnolia
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Darrick J. Wong 2020-09-09 09:34:13 -07:00 committed by Jan Kara
parent e9d4709fcc
commit ad47ff330b
2 changed files with 46 additions and 7 deletions
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42
fs/quota/quota.c
View File

@ -481,6 +481,14 @@ static inline u64 quota_btobb(u64 bytes)
return (bytes + (1 << XFS_BB_SHIFT) - 1) >> XFS_BB_SHIFT;
}
static inline s64 copy_from_xfs_dqblk_ts(const struct fs_disk_quota *d,
__s32 timer, __s8 timer_hi)
{
if (d->d_fieldmask & FS_DQ_BIGTIME)
return (u32)timer | (s64)timer_hi << 32;
return timer;
}
static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
{
dst->d_spc_hardlimit = quota_bbtob(src->d_blk_hardlimit);
@ -489,14 +497,17 @@ static void copy_from_xfs_dqblk(struct qc_dqblk *dst, struct fs_disk_quota *src)
dst->d_ino_softlimit = src->d_ino_softlimit;
dst->d_space = quota_bbtob(src->d_bcount);
dst->d_ino_count = src->d_icount;
dst->d_ino_timer = src->d_itimer;
dst->d_spc_timer = src->d_btimer;
dst->d_ino_timer = copy_from_xfs_dqblk_ts(src, src->d_itimer,
src->d_itimer_hi);
dst->d_spc_timer = copy_from_xfs_dqblk_ts(src, src->d_btimer,
src->d_btimer_hi);
dst->d_ino_warns = src->d_iwarns;
dst->d_spc_warns = src->d_bwarns;
dst->d_rt_spc_hardlimit = quota_bbtob(src->d_rtb_hardlimit);
dst->d_rt_spc_softlimit = quota_bbtob(src->d_rtb_softlimit);
dst->d_rt_space = quota_bbtob(src->d_rtbcount);
dst->d_rt_spc_timer = src->d_rtbtimer;
dst->d_rt_spc_timer = copy_from_xfs_dqblk_ts(src, src->d_rtbtimer,
src->d_rtbtimer_hi);
dst->d_rt_spc_warns = src->d_rtbwarns;
dst->d_fieldmask = 0;
if (src->d_fieldmask & FS_DQ_ISOFT)
@ -588,10 +599,26 @@ static int quota_setxquota(struct super_block *sb, int type, qid_t id,
return sb->s_qcop->set_dqblk(sb, qid, &qdq);
}
static inline void copy_to_xfs_dqblk_ts(const struct fs_disk_quota *d,
__s32 *timer_lo, __s8 *timer_hi, s64 timer)
{
*timer_lo = timer;
if (d->d_fieldmask & FS_DQ_BIGTIME)
*timer_hi = timer >> 32;
}
static inline bool want_bigtime(s64 timer)
{
return timer > S32_MAX || timer < S32_MIN;
}
static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
int type, qid_t id)
{
memset(dst, 0, sizeof(*dst));
if (want_bigtime(src->d_ino_timer) || want_bigtime(src->d_spc_timer) ||
want_bigtime(src->d_rt_spc_timer))
dst->d_fieldmask |= FS_DQ_BIGTIME;
dst->d_version = FS_DQUOT_VERSION;
dst->d_id = id;
if (type == USRQUOTA)
@ -606,14 +633,17 @@ static void copy_to_xfs_dqblk(struct fs_disk_quota *dst, struct qc_dqblk *src,
dst->d_ino_softlimit = src->d_ino_softlimit;
dst->d_bcount = quota_btobb(src->d_space);
dst->d_icount = src->d_ino_count;
dst->d_itimer = src->d_ino_timer;
dst->d_btimer = src->d_spc_timer;
copy_to_xfs_dqblk_ts(dst, &dst->d_itimer, &dst->d_itimer_hi,
src->d_ino_timer);
copy_to_xfs_dqblk_ts(dst, &dst->d_btimer, &dst->d_btimer_hi,
src->d_spc_timer);
dst->d_iwarns = src->d_ino_warns;
dst->d_bwarns = src->d_spc_warns;
dst->d_rtb_hardlimit = quota_btobb(src->d_rt_spc_hardlimit);
dst->d_rtb_softlimit = quota_btobb(src->d_rt_spc_softlimit);
dst->d_rtbcount = quota_btobb(src->d_rt_space);
dst->d_rtbtimer = src->d_rt_spc_timer;
copy_to_xfs_dqblk_ts(dst, &dst->d_rtbtimer, &dst->d_rtbtimer_hi,
src->d_rt_spc_timer);
dst->d_rtbwarns = src->d_rt_spc_warns;
}

11
include/uapi/linux/dqblk_xfs.h
View File

@ -66,7 +66,10 @@ typedef struct fs_disk_quota {
__s32 d_btimer; /* similar to above; for disk blocks */
__u16 d_iwarns; /* # warnings issued wrt num inodes */
__u16 d_bwarns; /* # warnings issued wrt disk blocks */
__s32 d_padding2; /* padding2 - for future use */
__s8 d_itimer_hi; /* upper 8 bits of timer values */
__s8 d_btimer_hi;
__s8 d_rtbtimer_hi;
__s8 d_padding2; /* padding2 - for future use */
__u64 d_rtb_hardlimit;/* absolute limit on realtime blks */
__u64 d_rtb_softlimit;/* preferred limit on RT disk blks */
__u64 d_rtbcount; /* # realtime blocks owned */
@ -121,6 +124,12 @@ typedef struct fs_disk_quota {
#define FS_DQ_RTBCOUNT (1<<14)
#define FS_DQ_ACCT_MASK (FS_DQ_BCOUNT | FS_DQ_ICOUNT | FS_DQ_RTBCOUNT)
/*
* Quota expiration timestamps are 40-bit signed integers, with the upper 8
* bits encoded in the _hi fields.
*/
#define FS_DQ_BIGTIME (1<<15)
/*
* Various flags related to quotactl(2).
*/