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	struct xfs_inode	*ip)
 25{
 26	int			error;
 27
 28	error = xchk_setup_fs(sc, ip);
 29	if (error)
 30		return error;
 31
 32	sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
 33	sc->ip = sc->mp->m_rbmip;
 34	xfs_ilock(sc->ip, sc->ilock_flags);
 35
 36	return 0;
 37}
 38
 39/* Realtime bitmap. */
 40
 41/* Scrub a free extent record from the realtime bitmap. */
 42STATIC int
 43xchk_rtbitmap_rec(
 44	struct xfs_trans	*tp,
 45	struct xfs_rtalloc_rec	*rec,
 46	void			*priv)
 47{
 48	struct xfs_scrub	*sc = priv;
 49	xfs_rtblock_t		startblock;
 50	xfs_rtblock_t		blockcount;
 51
 52	startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
 53	blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
 54
 55	if (startblock + blockcount <= startblock ||
 56	    !xfs_verify_rtbno(sc->mp, startblock) ||
 57	    !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
 58		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
 59	return 0;
 60}
 61
 62/* Make sure the entire rtbitmap file is mapped with written extents. */
 63STATIC int
 64xchk_rtbitmap_check_extents(
 65	struct xfs_scrub	*sc)
 66{
 67	struct xfs_mount	*mp = sc->mp;
 68	struct xfs_bmbt_irec	map;
 69	xfs_rtblock_t		off;
 70	int			nmap;
 71	int			error = 0;
 72
 73	for (off = 0; off < mp->m_sb.sb_rbmblocks;) {
 74		if (xchk_should_terminate(sc, &error) ||
 75		    (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
 76			break;
 77
 78		/* Make sure we have a written extent. */
 79		nmap = 1;
 80		error = xfs_bmapi_read(mp->m_rbmip, off,
 81				mp->m_sb.sb_rbmblocks - off, &map, &nmap,
 82				XFS_DATA_FORK);
 83		if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error))
 84			break;
 85
 86		if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) {
 87			xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off);
 88			break;
 89		}
 90
 91		off += map.br_blockcount;
 92	}
 93
 94	return error;
 95}
 96
 97/* Scrub the realtime bitmap. */
 98int
 99xchk_rtbitmap(
100	struct xfs_scrub	*sc)
101{
102	int			error;
103
104	/* Is the size of the rtbitmap correct? */
105	if (sc->mp->m_rbmip->i_d.di_size !=
106	    XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) {
107		xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
108		return 0;
109	}
110
111	/* Invoke the fork scrubber. */
112	error = xchk_metadata_inode_forks(sc);
113	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
114		return error;
115
116	error = xchk_rtbitmap_check_extents(sc);
117	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
118		return error;
119
120	error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
121	if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
122		goto out;
123
124out:
125	return error;
126}
127
128/* Scrub the realtime summary. */
129int
130xchk_rtsummary(
131	struct xfs_scrub	*sc)
132{
133	struct xfs_inode	*rsumip = sc->mp->m_rsumip;
134	struct xfs_inode	*old_ip = sc->ip;
135	uint			old_ilock_flags = sc->ilock_flags;
136	int			error = 0;
137
138	/*
139	 * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
140	 * rt summary ip in compliance with the rt inode locking rules.
141	 *
142	 * Since we switch sc->ip to rsumip we have to save the old ilock
143	 * flags so that we don't mix up the inode state that @sc tracks.
144	 */
145	sc->ip = rsumip;
146	sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
147	xfs_ilock(sc->ip, sc->ilock_flags);
148
149	/* Invoke the fork scrubber. */
150	error = xchk_metadata_inode_forks(sc);
151	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
152		goto out;
153
154	/* XXX: implement this some day */
155	xchk_set_incomplete(sc);
156out:
157	/* Switch back to the rtbitmap inode and lock flags. */
158	xfs_iunlock(sc->ip, sc->ilock_flags);
159	sc->ilock_flags = old_ilock_flags;
160	sc->ip = old_ip;
161	return error;
162}
163
164
165/* xref check that the extent is not free in the rtbitmap */
166void
167xchk_xref_is_used_rt_space(
168	struct xfs_scrub	*sc,
169	xfs_rtblock_t		fsbno,
170	xfs_extlen_t		len)
171{
172	xfs_rtblock_t		startext;
173	xfs_rtblock_t		endext;
174	xfs_rtblock_t		extcount;
175	bool			is_free;
176	int			error;
177
178	if (xchk_skip_xref(sc->sm))
179		return;
180
181	startext = fsbno;
182	endext = fsbno + len - 1;
183	do_div(startext, sc->mp->m_sb.sb_rextsize);
184	do_div(endext, sc->mp->m_sb.sb_rextsize);
185	extcount = endext - startext + 1;
186	xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
187	error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
188			&is_free);
189	if (!xchk_should_check_xref(sc, &error, NULL))
190		goto out_unlock;
191	if (is_free)
192		xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
193out_unlock:
194	xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
195}