fs/xfs/xfs_qm_syscalls.c:633:2: warning: Redundant assignment of 'dqp' to itself. [selfAssignment]

From: kernel test robot
Date: Sat Jan 15 2022 - 22:37:55 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: a33f5c380c4bd3fa5278d690421b72052456d9fe
commit: 7ac6eb46c9f32d3e6ae37943191cd744ffa1ef33 xfs: fix up build warnings when quotas are disabled
date: 12 months ago
compiler: sparc64-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


cppcheck warnings: (new ones prefixed by >>)
>> fs/xfs/xfs_qm_syscalls.c:633:2: warning: Redundant assignment of 'dqp' to itself. [selfAssignment]
xfs_qm_dqrele(dqp);
^
fs/xfs/xfs_qm_syscalls.c:770:3: warning: Redundant assignment of 'ip->i_udquot' to itself. [selfAssignment]
xfs_qm_dqrele(ip->i_udquot);
^
fs/xfs/xfs_qm_syscalls.c:774:3: warning: Redundant assignment of 'ip->i_gdquot' to itself. [selfAssignment]
xfs_qm_dqrele(ip->i_gdquot);
^
fs/xfs/xfs_qm_syscalls.c:778:3: warning: Redundant assignment of 'ip->i_pdquot' to itself. [selfAssignment]
xfs_qm_dqrele(ip->i_pdquot);
^

vim +/dqp +633 fs/xfs/xfs_qm_syscalls.c

d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 496
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 497 /*
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 498 * Adjust quota limits, and start/stop timers accordingly.
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 499 */
fcafb71b57a039f fs/xfs/quota/xfs_qm_syscalls.c Christoph Hellwig 2009-02-09 500 int
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 501 xfs_qm_scall_setqlim(
b136645116e5471 fs/xfs/xfs_qm_syscalls.c Brian Foster 2013-03-18 502 struct xfs_mount *mp,
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 503 xfs_dqid_t id,
1a7ed271653a4f4 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-15 504 xfs_dqtype_t type,
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 505 struct qc_dqblk *newlim)
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 506 {
8a7b8a89a3ae5b5 fs/xfs/quota/xfs_qm_syscalls.c Christoph Hellwig 2010-04-20 507 struct xfs_quotainfo *q = mp->m_quotainfo;
b136645116e5471 fs/xfs/xfs_qm_syscalls.c Brian Foster 2013-03-18 508 struct xfs_dquot *dqp;
b136645116e5471 fs/xfs/xfs_qm_syscalls.c Brian Foster 2013-03-18 509 struct xfs_trans *tp;
be6079461abf796 fs/xfs/xfs_qm_syscalls.c Carlos Maiolino 2016-02-08 510 struct xfs_def_quota *defq;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 511 struct xfs_dquot_res *res;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 512 struct xfs_quota_limits *qlim;
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 513 int error;
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 514 xfs_qcnt_t hard, soft;
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 515
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 516 if (newlim->d_fieldmask & ~XFS_QC_MASK)
2451337dd043901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2014-06-25 517 return -EINVAL;
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 518 if ((newlim->d_fieldmask & XFS_QC_MASK) == 0)
c472b4327597651 fs/xfs/quota/xfs_qm_syscalls.c Christoph Hellwig 2010-05-06 519 return 0;
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 520
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 521 /*
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 522 * We don't want to race with a quotaoff so take the quotaoff lock.
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 523 * We don't hold an inode lock, so there's nothing else to stop
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 524 * a quotaoff from happening.
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 525 */
8a7b8a89a3ae5b5 fs/xfs/quota/xfs_qm_syscalls.c Christoph Hellwig 2010-04-20 526 mutex_lock(&q->qi_quotaofflock);
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 527
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 528 /*
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 529 * Get the dquot (locked) before we start, as we need to do a
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 530 * transaction to allocate it if it doesn't exist. Once we have the
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 531 * dquot, unlock it so we can start the next transaction safely. We hold
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 532 * a reference to the dquot, so it's safe to do this unlock/lock without
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 533 * it being reclaimed in the mean time.
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 534 */
30ab2dcf2c0693e fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2018-05-04 535 error = xfs_qm_dqget(mp, id, type, true, &dqp);
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 536 if (error) {
2451337dd043901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2014-06-25 537 ASSERT(error != -ENOENT);
8a7b8a89a3ae5b5 fs/xfs/quota/xfs_qm_syscalls.c Christoph Hellwig 2010-04-20 538 goto out_unlock;
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 539 }
be6079461abf796 fs/xfs/xfs_qm_syscalls.c Carlos Maiolino 2016-02-08 540
ce6e7e79ced35a8 fs/xfs/xfs_qm_syscalls.c Eric Sandeen 2020-05-21 541 defq = xfs_get_defquota(q, xfs_dquot_type(dqp));
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 542 xfs_dqunlock(dqp);
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 543
253f4911f297b83 fs/xfs/xfs_qm_syscalls.c Christoph Hellwig 2016-04-06 544 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_qm_setqlim, 0, 0, 0, &tp);
253f4911f297b83 fs/xfs/xfs_qm_syscalls.c Christoph Hellwig 2016-04-06 545 if (error)
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 546 goto out_rele;
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 547
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 548 xfs_dqlock(dqp);
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 549 xfs_trans_dqjoin(tp, dqp);
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 550
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 551 /*
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 552 * Update quota limits, warnings, and timers, and the defaults
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 553 * if we're touching id == 0.
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 554 *
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 555 * Make sure that hardlimits are >= soft limits before changing.
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 556 *
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 557 * Update warnings counter(s) if requested.
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 558 *
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 559 * Timelimits for the super user set the relative time the other users
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 560 * can be over quota for this file system. If it is zero a default is
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 561 * used. Ditto for the default soft and hard limit values (already
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 562 * done, above), and for warnings.
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 563 *
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 564 * For other IDs, userspace can bump out the grace period if over
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 565 * the soft limit.
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 566 */
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 567
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 568 /* Blocks on the data device. */
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 569 hard = (newlim->d_fieldmask & QC_SPC_HARD) ?
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 570 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_hardlimit) :
d3537cf93e5e2f8 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 571 dqp->q_blk.hardlimit;
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 572 soft = (newlim->d_fieldmask & QC_SPC_SOFT) ?
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 573 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_spc_softlimit) :
d3537cf93e5e2f8 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 574 dqp->q_blk.softlimit;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 575 res = &dqp->q_blk;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 576 qlim = id == 0 ? &defq->blk : NULL;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 577
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 578 if (xfs_setqlim_limits(mp, res, qlim, hard, soft, "blk"))
b136645116e5471 fs/xfs/xfs_qm_syscalls.c Brian Foster 2013-03-18 579 xfs_dquot_set_prealloc_limits(dqp);
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 580 if (newlim->d_fieldmask & QC_SPC_WARNS)
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 581 xfs_setqlim_warns(res, qlim, newlim->d_spc_warns);
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 582 if (newlim->d_fieldmask & QC_SPC_TIMER)
11d8a9190275855 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-08-17 583 xfs_setqlim_timer(mp, res, qlim, newlim->d_spc_timer);
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 584
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 585 /* Blocks on the realtime device. */
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 586 hard = (newlim->d_fieldmask & QC_RT_SPC_HARD) ?
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 587 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_hardlimit) :
d3537cf93e5e2f8 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 588 dqp->q_rtb.hardlimit;
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 589 soft = (newlim->d_fieldmask & QC_RT_SPC_SOFT) ?
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 590 (xfs_qcnt_t) XFS_B_TO_FSB(mp, newlim->d_rt_spc_softlimit) :
d3537cf93e5e2f8 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 591 dqp->q_rtb.softlimit;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 592 res = &dqp->q_rtb;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 593 qlim = id == 0 ? &defq->rtb : NULL;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 594
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 595 xfs_setqlim_limits(mp, res, qlim, hard, soft, "rtb");
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 596 if (newlim->d_fieldmask & QC_RT_SPC_WARNS)
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 597 xfs_setqlim_warns(res, qlim, newlim->d_rt_spc_warns);
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 598 if (newlim->d_fieldmask & QC_RT_SPC_TIMER)
11d8a9190275855 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-08-17 599 xfs_setqlim_timer(mp, res, qlim, newlim->d_rt_spc_timer);
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 600
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 601 /* Inodes */
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 602 hard = (newlim->d_fieldmask & QC_INO_HARD) ?
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 603 (xfs_qcnt_t) newlim->d_ino_hardlimit :
d3537cf93e5e2f8 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 604 dqp->q_ino.hardlimit;
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 605 soft = (newlim->d_fieldmask & QC_INO_SOFT) ?
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 606 (xfs_qcnt_t) newlim->d_ino_softlimit :
d3537cf93e5e2f8 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 607 dqp->q_ino.softlimit;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 608 res = &dqp->q_ino;
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 609 qlim = id == 0 ? &defq->ino : NULL;
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 610
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 611 xfs_setqlim_limits(mp, res, qlim, hard, soft, "ino");
14bf61ffe6ac54a fs/xfs/xfs_qm_syscalls.c Jan Kara 2014-10-09 612 if (newlim->d_fieldmask & QC_INO_WARNS)
d1520deab039ca1 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 613 xfs_setqlim_warns(res, qlim, newlim->d_ino_warns);
df42ce64dc3eb7f fs/xfs/xfs_qm_syscalls.c Eric Sandeen 2020-05-21 614 if (newlim->d_fieldmask & QC_INO_TIMER)
11d8a9190275855 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-08-17 615 xfs_setqlim_timer(mp, res, qlim, newlim->d_ino_timer);
df42ce64dc3eb7f fs/xfs/xfs_qm_syscalls.c Eric Sandeen 2020-05-21 616
df42ce64dc3eb7f fs/xfs/xfs_qm_syscalls.c Eric Sandeen 2020-05-21 617 if (id != 0) {
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 618 /*
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 619 * If the user is now over quota, start the timelimit.
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 620 * The user will not be 'warned'.
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 621 * Note that we keep the timers ticking, whether enforcement
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 622 * is on or off. We don't really want to bother with iterating
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 623 * over all ondisk dquots and turning the timers on/off.
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 624 */
c8c753e19a76507 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 625 xfs_qm_adjust_dqtimers(dqp);
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 626 }
985a78fdde15e17 fs/xfs/xfs_qm_syscalls.c Darrick J. Wong 2020-07-14 627 dqp->q_flags |= XFS_DQFLAG_DIRTY;
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 628 xfs_trans_log_dquot(tp, dqp);
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 629
70393313dd0b26a fs/xfs/xfs_qm_syscalls.c Christoph Hellwig 2015-06-04 630 error = xfs_trans_commit(tp);
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 631
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 632 out_rele:
f648167f3ac7901 fs/xfs/xfs_qm_syscalls.c Dave Chinner 2013-05-21 @633 xfs_qm_dqrele(dqp);
8a7b8a89a3ae5b5 fs/xfs/quota/xfs_qm_syscalls.c Christoph Hellwig 2010-04-20 634 out_unlock:
8a7b8a89a3ae5b5 fs/xfs/quota/xfs_qm_syscalls.c Christoph Hellwig 2010-04-20 635 mutex_unlock(&q->qi_quotaofflock);
e5720eec0548c08 fs/xfs/quota/xfs_qm_syscalls.c David Chinner 2008-04-10 636 return error;
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 637 }
^1da177e4c3f415 fs/xfs/quota/xfs_qm_syscalls.c Linus Torvalds 2005-04-16 638

:::::: The code at line 633 was first introduced by commit
:::::: f648167f3ac79018c210112508c732ea9bf67c7b xfs: avoid nesting transactions in xfs_qm_scall_setqlim()

:::::: TO: Dave Chinner <dchinner@xxxxxxxxxx>
:::::: CC: Ben Myers <bpm@xxxxxxx>

---
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