fs/xfs/xfs_trans.c:559:8: warning: variable 'error' set but not used
From: kernel test robot
Date: Tue Nov 23 2021 - 18:23:00 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 136057256686de39cc3a07c2e39ef6bc43003ff6
commit: dc3ffbb14060c943469d5e12900db3a60bc3fa64 xfs: gut error handling in xfs_trans_unreserve_and_mod_sb()
date: 1 year, 6 months ago
config: x86_64-randconfig-a015-20211118 (https://download.01.org/0day-ci/archive/20211124/202111240723.ALWlwQXv-lkp@xxxxxxxxx/config.gz)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dc3ffbb14060c943469d5e12900db3a60bc3fa64
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout dc3ffbb14060c943469d5e12900db3a60bc3fa64
# save the config file to linux build tree
make W=1 ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
fs/xfs/xfs_trans.c: In function 'xfs_trans_unreserve_and_mod_sb':
>> fs/xfs/xfs_trans.c:559:8: warning: variable 'error' set but not used [-Wunused-but-set-variable]
559 | int error;
| ^~~~~
vim +/error +559 fs/xfs/xfs_trans.c
^1da177e4c3f41 Linus Torvalds 2005-04-16 536
^1da177e4c3f41 Linus Torvalds 2005-04-16 537 /*
dc3ffbb14060c9 Dave Chinner 2020-05-20 538 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations and
dc3ffbb14060c9 Dave Chinner 2020-05-20 539 * apply superblock counter changes to the in-core superblock. The
45c34141126a89 David Chinner 2007-06-18 540 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
45c34141126a89 David Chinner 2007-06-18 541 * applied to the in-core superblock. The idea is that that has already been
45c34141126a89 David Chinner 2007-06-18 542 * done.
^1da177e4c3f41 Linus Torvalds 2005-04-16 543 *
45c34141126a89 David Chinner 2007-06-18 544 * If we are not logging superblock counters, then the inode allocated/free and
45c34141126a89 David Chinner 2007-06-18 545 * used block counts are not updated in the on disk superblock. In this case,
45c34141126a89 David Chinner 2007-06-18 546 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
45c34141126a89 David Chinner 2007-06-18 547 * still need to update the incore superblock with the changes.
^1da177e4c3f41 Linus Torvalds 2005-04-16 548 */
71e330b593905e Dave Chinner 2010-05-21 549 void
^1da177e4c3f41 Linus Torvalds 2005-04-16 550 xfs_trans_unreserve_and_mod_sb(
0bd5ddedccca44 Dave Chinner 2015-02-23 551 struct xfs_trans *tp)
^1da177e4c3f41 Linus Torvalds 2005-04-16 552 {
0bd5ddedccca44 Dave Chinner 2015-02-23 553 struct xfs_mount *mp = tp->t_mountp;
0d485ada404b36 Dave Chinner 2015-02-23 554 bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
45c34141126a89 David Chinner 2007-06-18 555 int64_t blkdelta = 0;
45c34141126a89 David Chinner 2007-06-18 556 int64_t rtxdelta = 0;
1b0407125f9a5b Christoph Hellwig 2010-09-30 557 int64_t idelta = 0;
1b0407125f9a5b Christoph Hellwig 2010-09-30 558 int64_t ifreedelta = 0;
0bd5ddedccca44 Dave Chinner 2015-02-23 @559 int error;
^1da177e4c3f41 Linus Torvalds 2005-04-16 560
1b0407125f9a5b Christoph Hellwig 2010-09-30 561 /* calculate deltas */
45c34141126a89 David Chinner 2007-06-18 562 if (tp->t_blk_res > 0)
45c34141126a89 David Chinner 2007-06-18 563 blkdelta = tp->t_blk_res;
45c34141126a89 David Chinner 2007-06-18 564 if ((tp->t_fdblocks_delta != 0) &&
45c34141126a89 David Chinner 2007-06-18 565 (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
45c34141126a89 David Chinner 2007-06-18 566 (tp->t_flags & XFS_TRANS_SB_DIRTY)))
45c34141126a89 David Chinner 2007-06-18 567 blkdelta += tp->t_fdblocks_delta;
45c34141126a89 David Chinner 2007-06-18 568
45c34141126a89 David Chinner 2007-06-18 569 if (tp->t_rtx_res > 0)
45c34141126a89 David Chinner 2007-06-18 570 rtxdelta = tp->t_rtx_res;
45c34141126a89 David Chinner 2007-06-18 571 if ((tp->t_frextents_delta != 0) &&
45c34141126a89 David Chinner 2007-06-18 572 (tp->t_flags & XFS_TRANS_SB_DIRTY))
45c34141126a89 David Chinner 2007-06-18 573 rtxdelta += tp->t_frextents_delta;
45c34141126a89 David Chinner 2007-06-18 574
1b0407125f9a5b Christoph Hellwig 2010-09-30 575 if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
1b0407125f9a5b Christoph Hellwig 2010-09-30 576 (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
1b0407125f9a5b Christoph Hellwig 2010-09-30 577 idelta = tp->t_icount_delta;
1b0407125f9a5b Christoph Hellwig 2010-09-30 578 ifreedelta = tp->t_ifree_delta;
^1da177e4c3f41 Linus Torvalds 2005-04-16 579 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 580
1b0407125f9a5b Christoph Hellwig 2010-09-30 581 /* apply the per-cpu counters */
1b0407125f9a5b Christoph Hellwig 2010-09-30 582 if (blkdelta) {
0d485ada404b36 Dave Chinner 2015-02-23 583 error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
dc3ffbb14060c9 Dave Chinner 2020-05-20 584 ASSERT(!error);
1b0407125f9a5b Christoph Hellwig 2010-09-30 585 }
45c34141126a89 David Chinner 2007-06-18 586
1b0407125f9a5b Christoph Hellwig 2010-09-30 587 if (idelta) {
501ab323875339 Dave Chinner 2015-02-23 588 error = xfs_mod_icount(mp, idelta);
dc3ffbb14060c9 Dave Chinner 2020-05-20 589 ASSERT(!error);
^1da177e4c3f41 Linus Torvalds 2005-04-16 590 }
1b0407125f9a5b Christoph Hellwig 2010-09-30 591
1b0407125f9a5b Christoph Hellwig 2010-09-30 592 if (ifreedelta) {
e88b64ea1f3da6 Dave Chinner 2015-02-23 593 error = xfs_mod_ifree(mp, ifreedelta);
dc3ffbb14060c9 Dave Chinner 2020-05-20 594 ASSERT(!error);
^1da177e4c3f41 Linus Torvalds 2005-04-16 595 }
1b0407125f9a5b Christoph Hellwig 2010-09-30 596
0bd5ddedccca44 Dave Chinner 2015-02-23 597 if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
0bd5ddedccca44 Dave Chinner 2015-02-23 598 return;
0bd5ddedccca44 Dave Chinner 2015-02-23 599
1b0407125f9a5b Christoph Hellwig 2010-09-30 600 /* apply remaining deltas */
0bd5ddedccca44 Dave Chinner 2015-02-23 601 spin_lock(&mp->m_sb_lock);
dc3ffbb14060c9 Dave Chinner 2020-05-20 602 mp->m_sb.sb_frextents += rtxdelta;
dc3ffbb14060c9 Dave Chinner 2020-05-20 603 mp->m_sb.sb_dblocks += tp->t_dblocks_delta;
dc3ffbb14060c9 Dave Chinner 2020-05-20 604 mp->m_sb.sb_agcount += tp->t_agcount_delta;
dc3ffbb14060c9 Dave Chinner 2020-05-20 605 mp->m_sb.sb_imax_pct += tp->t_imaxpct_delta;
dc3ffbb14060c9 Dave Chinner 2020-05-20 606 mp->m_sb.sb_rextsize += tp->t_rextsize_delta;
dc3ffbb14060c9 Dave Chinner 2020-05-20 607 mp->m_sb.sb_rbmblocks += tp->t_rbmblocks_delta;
dc3ffbb14060c9 Dave Chinner 2020-05-20 608 mp->m_sb.sb_rblocks += tp->t_rblocks_delta;
dc3ffbb14060c9 Dave Chinner 2020-05-20 609 mp->m_sb.sb_rextents += tp->t_rextents_delta;
dc3ffbb14060c9 Dave Chinner 2020-05-20 610 mp->m_sb.sb_rextslog += tp->t_rextslog_delta;
0bd5ddedccca44 Dave Chinner 2015-02-23 611 spin_unlock(&mp->m_sb_lock);
1b0407125f9a5b Christoph Hellwig 2010-09-30 612
dc3ffbb14060c9 Dave Chinner 2020-05-20 613 /*
dc3ffbb14060c9 Dave Chinner 2020-05-20 614 * Debug checks outside of the spinlock so they don't lock up the
dc3ffbb14060c9 Dave Chinner 2020-05-20 615 * machine if they fail.
dc3ffbb14060c9 Dave Chinner 2020-05-20 616 */
dc3ffbb14060c9 Dave Chinner 2020-05-20 617 ASSERT(mp->m_sb.sb_imax_pct >= 0);
dc3ffbb14060c9 Dave Chinner 2020-05-20 618 ASSERT(mp->m_sb.sb_rextslog >= 0);
1b0407125f9a5b Christoph Hellwig 2010-09-30 619 return;
^1da177e4c3f41 Linus Torvalds 2005-04-16 620 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 621
:::::: The code at line 559 was first introduced by commit
:::::: 0bd5ddedccca4451ac2390d1155b4ab74b990eff xfs: replace xfs_mod_incore_sb_batched
:::::: TO: Dave Chinner <dchinner@xxxxxxxxxx>
:::::: CC: Dave Chinner <david@xxxxxxxxxxxxx>
---
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