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 "xfs_bmap.h"
 17#include "scrub/scrub.h"
 18#include "scrub/common.h"
 19
 20/* Set us up with the realtime metadata locked. */
 21int
 22xchk_setup_rt(
 23	struct xfs_scrub	*sc)
 24{
 25	int			error;
 26
 27	error = xchk_setup_fs(sc);
 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 (!xfs_verify_rtext(sc->mp, startblock, blockcount))
 55		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
 56	return 0;
 57}
 58
 59/* Make sure the entire rtbitmap file is mapped with written extents. */
 60STATIC int
 61xchk_rtbitmap_check_extents(
 62	struct xfs_scrub	*sc)
 63{
 64	struct xfs_mount	*mp = sc->mp;
 65	struct xfs_bmbt_irec	map;
 66	xfs_rtblock_t		off;
 67	int			nmap;
 68	int			error = 0;
 69
 70	for (off = 0; off < mp->m_sb.sb_rbmblocks;) {
 71		if (xchk_should_terminate(sc, &error) ||
 72		    (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 73			break;
 74
 75		/* Make sure we have a written extent. */
 76		nmap = 1;
 77		error = xfs_bmapi_read(mp->m_rbmip, off,
 78				mp->m_sb.sb_rbmblocks - off, &map, &nmap,
 79				XFS_DATA_FORK);
 80		if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error))
 81			break;
 82
 83		if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) {
 84			xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off);
 85			break;
 86		}
 87
 88		off += map.br_blockcount;
 89	}
 90
 91	return error;
 92}
 93
 94/* Scrub the realtime bitmap. */
 95int
 96xchk_rtbitmap(
 97	struct xfs_scrub	*sc)
 98{
 99	int			error;
100
101	/* Is the size of the rtbitmap correct? */
102	if (sc->mp->m_rbmip->i_disk_size !=
103	    XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) {
104		xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
105		return 0;
106	}
107
108	/* Invoke the fork scrubber. */
109	error = xchk_metadata_inode_forks(sc);
110	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
111		return error;
112
113	error = xchk_rtbitmap_check_extents(sc);
114	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
115		return error;
116
117	error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
118	if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
119		goto out;
120
121out:
122	return error;
123}
124
125/* Scrub the realtime summary. */
126int
127xchk_rtsummary(
128	struct xfs_scrub	*sc)
129{
130	struct xfs_inode	*rsumip = sc->mp->m_rsumip;
131	struct xfs_inode	*old_ip = sc->ip;
132	uint			old_ilock_flags = sc->ilock_flags;
133	int			error = 0;
134
135	/*
136	 * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
137	 * rt summary ip in compliance with the rt inode locking rules.
138	 *
139	 * Since we switch sc->ip to rsumip we have to save the old ilock
140	 * flags so that we don't mix up the inode state that @sc tracks.
141	 */
142	sc->ip = rsumip;
143	sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
144	xfs_ilock(sc->ip, sc->ilock_flags);
145
146	/* Invoke the fork scrubber. */
147	error = xchk_metadata_inode_forks(sc);
148	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
149		goto out;
150
151	/* XXX: implement this some day */
152	xchk_set_incomplete(sc);
153out:
154	/* Switch back to the rtbitmap inode and lock flags. */
155	xfs_iunlock(sc->ip, sc->ilock_flags);
156	sc->ilock_flags = old_ilock_flags;
157	sc->ip = old_ip;
158	return error;
159}
160
161
162/* xref check that the extent is not free in the rtbitmap */
163void
164xchk_xref_is_used_rt_space(
165	struct xfs_scrub	*sc,
166	xfs_rtblock_t		fsbno,
167	xfs_extlen_t		len)
168{
169	xfs_rtblock_t		startext;
170	xfs_rtblock_t		endext;
171	xfs_rtblock_t		extcount;
172	bool			is_free;
173	int			error;
174
175	if (xchk_skip_xref(sc->sm))
176		return;
177
178	startext = fsbno;
179	endext = fsbno + len - 1;
180	do_div(startext, sc->mp->m_sb.sb_rextsize);
181	do_div(endext, sc->mp->m_sb.sb_rextsize);
182	extcount = endext - startext + 1;
183	xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
184	error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
185			&is_free);
186	if (!xchk_should_check_xref(sc, &error, NULL))
187		goto out_unlock;
188	if (is_free)
189		xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
190out_unlock:
191	xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
192}