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