1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright (C) 2017 Oracle.  All Rights Reserved.
  4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
  5 */
  6#include "xfs.h"
  7#include "xfs_fs.h"
  8#include "xfs_shared.h"
  9#include "xfs_format.h"
 10#include "xfs_trans_resv.h"
 11#include "xfs_mount.h"
 12#include "xfs_log_format.h"
 13#include "xfs_trans.h"
 14#include "xfs_rtalloc.h"
 15#include "xfs_inode.h"
 16#include "scrub/scrub.h"
 17#include "scrub/common.h"
 18
 19/* Set us up with the realtime metadata locked. */
 20int
 21xchk_setup_rt(
 22	struct xfs_scrub	*sc,
 23	struct xfs_inode	*ip)
 24{
 25	int			error;
 26
 27	error = xchk_setup_fs(sc, ip);
 28	if (error)
 29		return error;
 30
 31	sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
 32	sc->ip = sc->mp->m_rbmip;
 33	xfs_ilock(sc->ip, sc->ilock_flags);
 34
 35	return 0;
 36}
 37
 38/* Realtime bitmap. */
 39
 40/* Scrub a free extent record from the realtime bitmap. */
 41STATIC int
 42xchk_rtbitmap_rec(
 43	struct xfs_trans	*tp,
 44	struct xfs_rtalloc_rec	*rec,
 45	void			*priv)
 46{
 47	struct xfs_scrub	*sc = priv;
 48	xfs_rtblock_t		startblock;
 49	xfs_rtblock_t		blockcount;
 50
 51	startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
 52	blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
 53
 54	if (startblock + blockcount <= startblock ||
 55	    !xfs_verify_rtbno(sc->mp, startblock) ||
 56	    !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
 57		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
 58	return 0;
 59}
 60
 61/* Scrub the realtime bitmap. */
 62int
 63xchk_rtbitmap(
 64	struct xfs_scrub	*sc)
 65{
 66	int			error;
 67
 68	/* Invoke the fork scrubber. */
 69	error = xchk_metadata_inode_forks(sc);
 70	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 71		return error;
 72
 73	error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
 74	if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
 75		goto out;
 76
 77out:
 78	return error;
 79}
 80
 81/* Scrub the realtime summary. */
 82int
 83xchk_rtsummary(
 84	struct xfs_scrub	*sc)
 85{
 86	struct xfs_inode	*rsumip = sc->mp->m_rsumip;
 87	struct xfs_inode	*old_ip = sc->ip;
 88	uint			old_ilock_flags = sc->ilock_flags;
 89	int			error = 0;
 90
 91	/*
 92	 * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
 93	 * rt summary ip in compliance with the rt inode locking rules.
 94	 *
 95	 * Since we switch sc->ip to rsumip we have to save the old ilock
 96	 * flags so that we don't mix up the inode state that @sc tracks.
 97	 */
 98	sc->ip = rsumip;
 99	sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
100	xfs_ilock(sc->ip, sc->ilock_flags);
101
102	/* Invoke the fork scrubber. */
103	error = xchk_metadata_inode_forks(sc);
104	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
105		goto out;
106
107	/* XXX: implement this some day */
108	xchk_set_incomplete(sc);
109out:
110	/* Switch back to the rtbitmap inode and lock flags. */
111	xfs_iunlock(sc->ip, sc->ilock_flags);
112	sc->ilock_flags = old_ilock_flags;
113	sc->ip = old_ip;
114	return error;
115}
116
117
118/* xref check that the extent is not free in the rtbitmap */
119void
120xchk_xref_is_used_rt_space(
121	struct xfs_scrub	*sc,
122	xfs_rtblock_t		fsbno,
123	xfs_extlen_t		len)
124{
125	xfs_rtblock_t		startext;
126	xfs_rtblock_t		endext;
127	xfs_rtblock_t		extcount;
128	bool			is_free;
129	int			error;
130
131	if (xchk_skip_xref(sc->sm))
132		return;
133
134	startext = fsbno;
135	endext = fsbno + len - 1;
136	do_div(startext, sc->mp->m_sb.sb_rextsize);
137	do_div(endext, sc->mp->m_sb.sb_rextsize);
138	extcount = endext - startext + 1;
139	xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
140	error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
141			&is_free);
142	if (!xchk_should_check_xref(sc, &error, NULL))
143		goto out_unlock;
144	if (is_free)
145		xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
146out_unlock:
147	xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
148}