[djwong-xfs:vectorized-scrub 99/334] fs/xfs/scrub/fscounters.c:198 xchk_fscounters_freeze() warn: inconsistent returns '&sb->s_umount'.
From: Dan Carpenter
Date: Tue Jan 18 2022 - 23:00:30 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git vectorized-scrub
head: 8427da8e62fbcf9a04e5b2663fe60b97d6911417
commit: 8dd594d12f08acc6c6fa388b2cae3e270bf8effc [99/334] xfs: stabilize fs summary counters for online fsck
config: ia64-randconfig-m031-20220116 (https://download.01.org/0day-ci/archive/20220117/202201170928.GcIhOWMI-lkp@xxxxxxxxx/config)
compiler: ia64-linux-gcc (GCC) 11.2.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
smatch warnings:
fs/xfs/scrub/fscounters.c:198 xchk_fscounters_freeze() warn: inconsistent returns '&sb->s_umount'.
vim +198 fs/xfs/scrub/fscounters.c
8dd594d12f08acc Darrick J. Wong 2022-01-06 125 STATIC int
8dd594d12f08acc Darrick J. Wong 2022-01-06 126 xchk_fscounters_freeze(
8dd594d12f08acc Darrick J. Wong 2022-01-06 127 struct xfs_scrub *sc)
8dd594d12f08acc Darrick J. Wong 2022-01-06 128 {
8dd594d12f08acc Darrick J. Wong 2022-01-06 129 struct xchk_fscounters *fsc = sc->buf;
8dd594d12f08acc Darrick J. Wong 2022-01-06 130 struct xfs_mount *mp = sc->mp;
8dd594d12f08acc Darrick J. Wong 2022-01-06 131 struct super_block *sb = mp->m_super;
8dd594d12f08acc Darrick J. Wong 2022-01-06 132 int level;
8dd594d12f08acc Darrick J. Wong 2022-01-06 133 int error = 0;
8dd594d12f08acc Darrick J. Wong 2022-01-06 134
8dd594d12f08acc Darrick J. Wong 2022-01-06 135 if (sc->flags & XCHK_HAVE_FREEZE_PROT) {
8dd594d12f08acc Darrick J. Wong 2022-01-06 136 sc->flags &= ~XCHK_HAVE_FREEZE_PROT;
8dd594d12f08acc Darrick J. Wong 2022-01-06 137 mnt_drop_write_file(sc->file);
8dd594d12f08acc Darrick J. Wong 2022-01-06 138 }
8dd594d12f08acc Darrick J. Wong 2022-01-06 139
8dd594d12f08acc Darrick J. Wong 2022-01-06 140 /* Wait until we're ready to freeze or give up. */
8dd594d12f08acc Darrick J. Wong 2022-01-06 141 down_write(&sb->s_umount);
8dd594d12f08acc Darrick J. Wong 2022-01-06 142 while (sb->s_writers.frozen != SB_UNFROZEN) {
8dd594d12f08acc Darrick J. Wong 2022-01-06 143 up_write(&sb->s_umount);
8dd594d12f08acc Darrick J. Wong 2022-01-06 144
8dd594d12f08acc Darrick J. Wong 2022-01-06 145 if (xchk_should_terminate(sc, &error))
8dd594d12f08acc Darrick J. Wong 2022-01-06 146 return error;
8dd594d12f08acc Darrick J. Wong 2022-01-06 147
8dd594d12f08acc Darrick J. Wong 2022-01-06 148 delay(HZ / 10);
8dd594d12f08acc Darrick J. Wong 2022-01-06 149 down_write(&sb->s_umount);
8dd594d12f08acc Darrick J. Wong 2022-01-06 150 }
8dd594d12f08acc Darrick J. Wong 2022-01-06 151
8dd594d12f08acc Darrick J. Wong 2022-01-06 152 if (sb_rdonly(sb)) {
8dd594d12f08acc Darrick J. Wong 2022-01-06 153 sb->s_writers.frozen = SB_FREEZE_EXCLUSIVE;
8dd594d12f08acc Darrick J. Wong 2022-01-06 154 goto done;
8dd594d12f08acc Darrick J. Wong 2022-01-06 155 }
8dd594d12f08acc Darrick J. Wong 2022-01-06 156
8dd594d12f08acc Darrick J. Wong 2022-01-06 157 sb->s_writers.frozen = SB_FREEZE_WRITE;
8dd594d12f08acc Darrick J. Wong 2022-01-06 158 /* Release s_umount to preserve sb_start_write -> s_umount ordering */
8dd594d12f08acc Darrick J. Wong 2022-01-06 159 up_write(&sb->s_umount);
8dd594d12f08acc Darrick J. Wong 2022-01-06 160 percpu_down_write(sb->s_writers.rw_sem + SB_FREEZE_WRITE - 1);
8dd594d12f08acc Darrick J. Wong 2022-01-06 161 down_write(&sb->s_umount);
8dd594d12f08acc Darrick J. Wong 2022-01-06 162
8dd594d12f08acc Darrick J. Wong 2022-01-06 163 /* Now we go and block page faults... */
8dd594d12f08acc Darrick J. Wong 2022-01-06 164 sb->s_writers.frozen = SB_FREEZE_PAGEFAULT;
8dd594d12f08acc Darrick J. Wong 2022-01-06 165 percpu_down_write(sb->s_writers.rw_sem + SB_FREEZE_PAGEFAULT - 1);
8dd594d12f08acc Darrick J. Wong 2022-01-06 166
8dd594d12f08acc Darrick J. Wong 2022-01-06 167 /*
8dd594d12f08acc Darrick J. Wong 2022-01-06 168 * All writers are done so after syncing there won't be dirty data.
8dd594d12f08acc Darrick J. Wong 2022-01-06 169 * Let xfs_fs_sync_fs flush dirty data so the VFS won't start writeback
8dd594d12f08acc Darrick J. Wong 2022-01-06 170 * and to disable the background gc workers.
8dd594d12f08acc Darrick J. Wong 2022-01-06 171 */
8dd594d12f08acc Darrick J. Wong 2022-01-06 172 error = sync_filesystem(sb);
8dd594d12f08acc Darrick J. Wong 2022-01-06 173 if (error) {
8dd594d12f08acc Darrick J. Wong 2022-01-06 174 sb->s_writers.frozen = SB_UNFROZEN;
8dd594d12f08acc Darrick J. Wong 2022-01-06 175 for (level = SB_FREEZE_PAGEFAULT; level >= 0; level--)
8dd594d12f08acc Darrick J. Wong 2022-01-06 176 percpu_up_write(sb->s_writers.rw_sem + level);
8dd594d12f08acc Darrick J. Wong 2022-01-06 177 wake_up(&sb->s_writers.wait_unfrozen);
Smatch wanted an up_write(&sb->s_umount); but this looks intentional?
8dd594d12f08acc Darrick J. Wong 2022-01-06 178 return error;
8dd594d12f08acc Darrick J. Wong 2022-01-06 179 }
8dd594d12f08acc Darrick J. Wong 2022-01-06 180
8dd594d12f08acc Darrick J. Wong 2022-01-06 181 /* Now wait for internal filesystem counter */
8dd594d12f08acc Darrick J. Wong 2022-01-06 182 sb->s_writers.frozen = SB_FREEZE_FS;
8dd594d12f08acc Darrick J. Wong 2022-01-06 183 percpu_down_write(sb->s_writers.rw_sem + SB_FREEZE_FS - 1);
8dd594d12f08acc Darrick J. Wong 2022-01-06 184
8dd594d12f08acc Darrick J. Wong 2022-01-06 185 /*
8dd594d12f08acc Darrick J. Wong 2022-01-06 186 * We do not need to quiesce the log to check the summary counters, so
8dd594d12f08acc Darrick J. Wong 2022-01-06 187 * skip the call to xfs_fs_freeze here. To prevent anyone else from
8dd594d12f08acc Darrick J. Wong 2022-01-06 188 * unfreezing us, set the VFS freeze level to one higher than
8dd594d12f08acc Darrick J. Wong 2022-01-06 189 * FREEZE_COMPLETE.
8dd594d12f08acc Darrick J. Wong 2022-01-06 190 */
8dd594d12f08acc Darrick J. Wong 2022-01-06 191 sb->s_writers.frozen = SB_FREEZE_EXCLUSIVE;
8dd594d12f08acc Darrick J. Wong 2022-01-06 192 for (level = SB_FREEZE_LEVELS - 1; level >= 0; level--)
8dd594d12f08acc Darrick J. Wong 2022-01-06 193 percpu_rwsem_release(sb->s_writers.rw_sem + level, 0,
8dd594d12f08acc Darrick J. Wong 2022-01-06 194 _THIS_IP_);
8dd594d12f08acc Darrick J. Wong 2022-01-06 195 done:
8dd594d12f08acc Darrick J. Wong 2022-01-06 196 fsc->frozen = true;
8dd594d12f08acc Darrick J. Wong 2022-01-06 197 up_write(&sb->s_umount);
8dd594d12f08acc Darrick J. Wong 2022-01-06 @198 return 0;
8dd594d12f08acc Darrick J. Wong 2022-01-06 199 }
---
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