v4.19.13 snapshot.
diff --git a/fs/xfs/scrub/quota.c b/fs/xfs/scrub/quota.c
new file mode 100644
index 0000000..782d582
--- /dev/null
+++ b/fs/xfs/scrub/quota.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_btree.h"
+#include "xfs_bit.h"
+#include "xfs_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_inode.h"
+#include "xfs_inode_fork.h"
+#include "xfs_alloc.h"
+#include "xfs_bmap.h"
+#include "xfs_quota.h"
+#include "xfs_qm.h"
+#include "xfs_dquot.h"
+#include "xfs_dquot_item.h"
+#include "scrub/xfs_scrub.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+#include "scrub/trace.h"
+
+/* Convert a scrub type code to a DQ flag, or return 0 if error. */
+static inline uint
+xchk_quota_to_dqtype(
+ struct xfs_scrub *sc)
+{
+ switch (sc->sm->sm_type) {
+ case XFS_SCRUB_TYPE_UQUOTA:
+ return XFS_DQ_USER;
+ case XFS_SCRUB_TYPE_GQUOTA:
+ return XFS_DQ_GROUP;
+ case XFS_SCRUB_TYPE_PQUOTA:
+ return XFS_DQ_PROJ;
+ default:
+ return 0;
+ }
+}
+
+/* Set us up to scrub a quota. */
+int
+xchk_setup_quota(
+ struct xfs_scrub *sc,
+ struct xfs_inode *ip)
+{
+ uint dqtype;
+ int error;
+
+ if (!XFS_IS_QUOTA_RUNNING(sc->mp) || !XFS_IS_QUOTA_ON(sc->mp))
+ return -ENOENT;
+
+ dqtype = xchk_quota_to_dqtype(sc);
+ if (dqtype == 0)
+ return -EINVAL;
+ sc->has_quotaofflock = true;
+ mutex_lock(&sc->mp->m_quotainfo->qi_quotaofflock);
+ if (!xfs_this_quota_on(sc->mp, dqtype))
+ return -ENOENT;
+ error = xchk_setup_fs(sc, ip);
+ if (error)
+ return error;
+ sc->ip = xfs_quota_inode(sc->mp, dqtype);
+ xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
+ sc->ilock_flags = XFS_ILOCK_EXCL;
+ return 0;
+}
+
+/* Quotas. */
+
+struct xchk_quota_info {
+ struct xfs_scrub *sc;
+ xfs_dqid_t last_id;
+};
+
+/* Scrub the fields in an individual quota item. */
+STATIC int
+xchk_quota_item(
+ struct xfs_dquot *dq,
+ uint dqtype,
+ void *priv)
+{
+ struct xchk_quota_info *sqi = priv;
+ struct xfs_scrub *sc = sqi->sc;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_disk_dquot *d = &dq->q_core;
+ struct xfs_quotainfo *qi = mp->m_quotainfo;
+ xfs_fileoff_t offset;
+ unsigned long long bsoft;
+ unsigned long long isoft;
+ unsigned long long rsoft;
+ unsigned long long bhard;
+ unsigned long long ihard;
+ unsigned long long rhard;
+ unsigned long long bcount;
+ unsigned long long icount;
+ unsigned long long rcount;
+ xfs_ino_t fs_icount;
+ xfs_dqid_t id = be32_to_cpu(d->d_id);
+
+ /*
+ * Except for the root dquot, the actual dquot we got must either have
+ * the same or higher id as we saw before.
+ */
+ offset = id / qi->qi_dqperchunk;
+ if (id && id <= sqi->last_id)
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
+
+ sqi->last_id = id;
+
+ /* Did we get the dquot type we wanted? */
+ if (dqtype != (d->d_flags & XFS_DQ_ALLTYPES))
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
+
+ if (d->d_pad0 != cpu_to_be32(0) || d->d_pad != cpu_to_be16(0))
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
+
+ /* Check the limits. */
+ bhard = be64_to_cpu(d->d_blk_hardlimit);
+ ihard = be64_to_cpu(d->d_ino_hardlimit);
+ rhard = be64_to_cpu(d->d_rtb_hardlimit);
+
+ bsoft = be64_to_cpu(d->d_blk_softlimit);
+ isoft = be64_to_cpu(d->d_ino_softlimit);
+ rsoft = be64_to_cpu(d->d_rtb_softlimit);
+
+ /*
+ * Warn if the hard limits are larger than the fs.
+ * Administrators can do this, though in production this seems
+ * suspect, which is why we flag it for review.
+ *
+ * Complain about corruption if the soft limit is greater than
+ * the hard limit.
+ */
+ if (bhard > mp->m_sb.sb_dblocks)
+ xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
+ if (bsoft > bhard)
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
+
+ if (ihard > mp->m_maxicount)
+ xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
+ if (isoft > ihard)
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
+
+ if (rhard > mp->m_sb.sb_rblocks)
+ xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
+ if (rsoft > rhard)
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
+
+ /* Check the resource counts. */
+ bcount = be64_to_cpu(d->d_bcount);
+ icount = be64_to_cpu(d->d_icount);
+ rcount = be64_to_cpu(d->d_rtbcount);
+ fs_icount = percpu_counter_sum(&mp->m_icount);
+
+ /*
+ * Check that usage doesn't exceed physical limits. However, on
+ * a reflink filesystem we're allowed to exceed physical space
+ * if there are no quota limits.
+ */
+ if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+ if (mp->m_sb.sb_dblocks < bcount)
+ xchk_fblock_set_warning(sc, XFS_DATA_FORK,
+ offset);
+ } else {
+ if (mp->m_sb.sb_dblocks < bcount)
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
+ offset);
+ }
+ if (icount > fs_icount || rcount > mp->m_sb.sb_rblocks)
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
+
+ /*
+ * We can violate the hard limits if the admin suddenly sets a
+ * lower limit than the actual usage. However, we flag it for
+ * admin review.
+ */
+ if (id != 0 && bhard != 0 && bcount > bhard)
+ xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
+ if (id != 0 && ihard != 0 && icount > ihard)
+ xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
+ if (id != 0 && rhard != 0 && rcount > rhard)
+ xchk_fblock_set_warning(sc, XFS_DATA_FORK, offset);
+
+ return 0;
+}
+
+/* Check the quota's data fork. */
+STATIC int
+xchk_quota_data_fork(
+ struct xfs_scrub *sc)
+{
+ struct xfs_bmbt_irec irec = { 0 };
+ struct xfs_iext_cursor icur;
+ struct xfs_quotainfo *qi = sc->mp->m_quotainfo;
+ struct xfs_ifork *ifp;
+ xfs_fileoff_t max_dqid_off;
+ int error = 0;
+
+ /* Invoke the fork scrubber. */
+ error = xchk_metadata_inode_forks(sc);
+ if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
+ return error;
+
+ /* Check for data fork problems that apply only to quota files. */
+ max_dqid_off = ((xfs_dqid_t)-1) / qi->qi_dqperchunk;
+ ifp = XFS_IFORK_PTR(sc->ip, XFS_DATA_FORK);
+ for_each_xfs_iext(ifp, &icur, &irec) {
+ if (xchk_should_terminate(sc, &error))
+ break;
+ /*
+ * delalloc extents or blocks mapped above the highest
+ * quota id shouldn't happen.
+ */
+ if (isnullstartblock(irec.br_startblock) ||
+ irec.br_startoff > max_dqid_off ||
+ irec.br_startoff + irec.br_blockcount - 1 > max_dqid_off) {
+ xchk_fblock_set_corrupt(sc, XFS_DATA_FORK,
+ irec.br_startoff);
+ break;
+ }
+ }
+
+ return error;
+}
+
+/* Scrub all of a quota type's items. */
+int
+xchk_quota(
+ struct xfs_scrub *sc)
+{
+ struct xchk_quota_info sqi;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_quotainfo *qi = mp->m_quotainfo;
+ uint dqtype;
+ int error = 0;
+
+ dqtype = xchk_quota_to_dqtype(sc);
+
+ /* Look for problem extents. */
+ error = xchk_quota_data_fork(sc);
+ if (error)
+ goto out;
+ if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
+ goto out;
+
+ /*
+ * Check all the quota items. Now that we've checked the quota inode
+ * data fork we have to drop ILOCK_EXCL to use the regular dquot
+ * functions.
+ */
+ xfs_iunlock(sc->ip, sc->ilock_flags);
+ sc->ilock_flags = 0;
+ sqi.sc = sc;
+ sqi.last_id = 0;
+ error = xfs_qm_dqiterate(mp, dqtype, xchk_quota_item, &sqi);
+ sc->ilock_flags = XFS_ILOCK_EXCL;
+ xfs_ilock(sc->ip, sc->ilock_flags);
+ if (!xchk_fblock_process_error(sc, XFS_DATA_FORK,
+ sqi.last_id * qi->qi_dqperchunk, &error))
+ goto out;
+
+out:
+ return error;
+}