rtbitmap.h

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright (C) 2023 Oracle.  All Rights Reserved.
 4 * Author: Darrick J. Wong <djwong@kernel.org>
 5 */
 6#ifndef __XFS_SCRUB_RTBITMAP_H__
 7#define __XFS_SCRUB_RTBITMAP_H__
 8
 9/*
10 * We use an xfile to construct new bitmap blocks for the portion of the
11 * rtbitmap file that we're replacing.  Whereas the ondisk bitmap must be
12 * accessed through the buffer cache, the xfile bitmap supports direct
13 * word-level accesses.  Therefore, we create a small abstraction for linear
14 * access.
15 */
16typedef unsigned long long xrep_wordoff_t;
17typedef unsigned int xrep_wordcnt_t;
18
19/* Mask to round an rtx down to the nearest bitmap word. */
20#define XREP_RTBMP_WORDMASK	((1ULL << XFS_NBWORDLOG) - 1)
21
22
23struct xchk_rtbitmap {
24	struct xfs_scrub	*sc;
25
26	uint64_t		rextents;
27	uint64_t		rbmblocks;
28	unsigned int		rextslog;
29	unsigned int		resblks;
30
31	/* The next free rt group block number that we expect to see. */
32	xfs_rgblock_t		next_free_rgbno;
33
34#ifdef CONFIG_XFS_ONLINE_REPAIR
35	/* stuff for staging a new bitmap */
36	struct xfs_rtalloc_args	args;
37	struct xrep_tempexch	tempexch;
38#endif
39
40	/* The next rtgroup block we expect to see during our rtrmapbt walk. */
41	xfs_rgblock_t		next_rgbno;
42
43	/* rtgroup lock flags */
44	unsigned int		rtglock_flags;
45
46	/* rtword position of xfile as we write buffers to disk. */
47	xrep_wordoff_t		prep_wordoff;
48
49	/* In-Memory rtbitmap for repair. */
50	union xfs_rtword_raw	words[];
51};
52
53#ifdef CONFIG_XFS_ONLINE_REPAIR
54int xrep_setup_rtbitmap(struct xfs_scrub *sc, struct xchk_rtbitmap *rtb);
55
56/*
57 * How big should the words[] buffer be?
58 *
59 * For repairs, we want a full fsblock worth of space so that we can memcpy a
60 * buffer full of 1s into the xfile bitmap.  The xfile bitmap doesn't have
61 * rtbitmap block headers, so we don't use blockwsize.  Scrub doesn't use the
62 * words buffer at all.
63 */
64static inline unsigned int
65xchk_rtbitmap_wordcnt(
66	struct xfs_scrub	*sc)
67{
68	if (xchk_could_repair(sc))
69		return sc->mp->m_sb.sb_blocksize >> XFS_WORDLOG;
70	return 0;
71}
72#else
73# define xrep_setup_rtbitmap(sc, rtb)	(0)
74# define xchk_rtbitmap_wordcnt(sc)	(0)
75#endif /* CONFIG_XFS_ONLINE_REPAIR */
76
77#endif /* __XFS_SCRUB_RTBITMAP_H__ */