xref: /openbmc/linux/fs/xfs/scrub/rtbitmap.c (revision 93f5715e)
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_defer.h"
13 #include "xfs_btree.h"
14 #include "xfs_bit.h"
15 #include "xfs_log_format.h"
16 #include "xfs_trans.h"
17 #include "xfs_sb.h"
18 #include "xfs_alloc.h"
19 #include "xfs_rtalloc.h"
20 #include "xfs_inode.h"
21 #include "scrub/xfs_scrub.h"
22 #include "scrub/scrub.h"
23 #include "scrub/common.h"
24 #include "scrub/trace.h"
25 
26 /* Set us up with the realtime metadata locked. */
27 int
28 xchk_setup_rt(
29 	struct xfs_scrub	*sc,
30 	struct xfs_inode	*ip)
31 {
32 	int			error;
33 
34 	error = xchk_setup_fs(sc, ip);
35 	if (error)
36 		return error;
37 
38 	sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
39 	sc->ip = sc->mp->m_rbmip;
40 	xfs_ilock(sc->ip, sc->ilock_flags);
41 
42 	return 0;
43 }
44 
45 /* Realtime bitmap. */
46 
47 /* Scrub a free extent record from the realtime bitmap. */
48 STATIC int
49 xchk_rtbitmap_rec(
50 	struct xfs_trans	*tp,
51 	struct xfs_rtalloc_rec	*rec,
52 	void			*priv)
53 {
54 	struct xfs_scrub	*sc = priv;
55 	xfs_rtblock_t		startblock;
56 	xfs_rtblock_t		blockcount;
57 
58 	startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
59 	blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
60 
61 	if (startblock + blockcount <= startblock ||
62 	    !xfs_verify_rtbno(sc->mp, startblock) ||
63 	    !xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
64 		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
65 	return 0;
66 }
67 
68 /* Scrub the realtime bitmap. */
69 int
70 xchk_rtbitmap(
71 	struct xfs_scrub	*sc)
72 {
73 	int			error;
74 
75 	/* Invoke the fork scrubber. */
76 	error = xchk_metadata_inode_forks(sc);
77 	if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
78 		return error;
79 
80 	error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
81 	if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
82 		goto out;
83 
84 out:
85 	return error;
86 }
87 
88 /* Scrub the realtime summary. */
89 int
90 xchk_rtsummary(
91 	struct xfs_scrub	*sc)
92 {
93 	struct xfs_inode	*rsumip = sc->mp->m_rsumip;
94 	struct xfs_inode	*old_ip = sc->ip;
95 	uint			old_ilock_flags = sc->ilock_flags;
96 	int			error = 0;
97 
98 	/*
99 	 * We ILOCK'd the rt bitmap ip in the setup routine, now lock the
100 	 * rt summary ip in compliance with the rt inode locking rules.
101 	 *
102 	 * Since we switch sc->ip to rsumip we have to save the old ilock
103 	 * flags so that we don't mix up the inode state that @sc tracks.
104 	 */
105 	sc->ip = rsumip;
106 	sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
107 	xfs_ilock(sc->ip, sc->ilock_flags);
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 		goto out;
113 
114 	/* XXX: implement this some day */
115 	xchk_set_incomplete(sc);
116 out:
117 	/* Switch back to the rtbitmap inode and lock flags. */
118 	xfs_iunlock(sc->ip, sc->ilock_flags);
119 	sc->ilock_flags = old_ilock_flags;
120 	sc->ip = old_ip;
121 	return error;
122 }
123 
124 
125 /* xref check that the extent is not free in the rtbitmap */
126 void
127 xchk_xref_is_used_rt_space(
128 	struct xfs_scrub	*sc,
129 	xfs_rtblock_t		fsbno,
130 	xfs_extlen_t		len)
131 {
132 	xfs_rtblock_t		startext;
133 	xfs_rtblock_t		endext;
134 	xfs_rtblock_t		extcount;
135 	bool			is_free;
136 	int			error;
137 
138 	if (xchk_skip_xref(sc->sm))
139 		return;
140 
141 	startext = fsbno;
142 	endext = fsbno + len - 1;
143 	do_div(startext, sc->mp->m_sb.sb_rextsize);
144 	if (do_div(endext, sc->mp->m_sb.sb_rextsize))
145 		endext++;
146 	extcount = endext - startext;
147 	xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
148 	error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
149 			&is_free);
150 	if (!xchk_should_check_xref(sc, &error, NULL))
151 		goto out_unlock;
152 	if (is_free)
153 		xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
154 out_unlock:
155 	xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
156 }
157