1 files changed, 272 insertions, 0 deletions
diff --git a/fs/xfs/scrub/quota.c b/fs/xfs/scrub/quota.c
new file mode 100644
index 000000000..782d582d3
--- /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;
+}