xfs/scrub/attr.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * Copyright (C) 2019 Oracle.  All Rights Reserved.
0004  * Author: Darrick J. Wong <darrick.wong@oracle.com>
0005  */
0006 #ifndef __XFS_SCRUB_ATTR_H__
0007 #define __XFS_SCRUB_ATTR_H__
0008
0009 /*
0010  * Temporary storage for online scrub and repair of extended attributes.
0011  */
0012 struct xchk_xattr_buf {
0013     /* Size of @buf, in bytes. */
0014     size_t          sz;
0015
0016     /*
0017      * Memory buffer -- either used for extracting attr values while
0018      * walking the attributes; or for computing attr block bitmaps when
0019      * checking the attribute tree.
0020      *
0021      * Each bitmap contains enough bits to track every byte in an attr
0022      * block (rounded up to the size of an unsigned long).  The attr block
0023      * used space bitmap starts at the beginning of the buffer; the free
0024      * space bitmap follows immediately after; and we have a third buffer
0025      * for storing intermediate bitmap results.
0026      */
0027     uint8_t         buf[];
0028 };
0029
0030 /* A place to store attribute values. */
0031 static inline uint8_t *
0032 xchk_xattr_valuebuf(
0033     struct xfs_scrub    *sc)
0034 {
0035     struct xchk_xattr_buf   *ab = sc->buf;
0036
0037     return ab->buf;
0038 }
0039
0040 /* A bitmap of space usage computed by walking an attr leaf block. */
0041 static inline unsigned long *
0042 xchk_xattr_usedmap(
0043     struct xfs_scrub    *sc)
0044 {
0045     struct xchk_xattr_buf   *ab = sc->buf;
0046
0047     return (unsigned long *)ab->buf;
0048 }
0049
0050 /* A bitmap of free space computed by walking attr leaf block free info. */
0051 static inline unsigned long *
0052 xchk_xattr_freemap(
0053     struct xfs_scrub    *sc)
0054 {
0055     return xchk_xattr_usedmap(sc) +
0056             BITS_TO_LONGS(sc->mp->m_attr_geo->blksize);
0057 }
0058
0059 /* A bitmap used to hold temporary results. */
0060 static inline unsigned long *
0061 xchk_xattr_dstmap(
0062     struct xfs_scrub    *sc)
0063 {
0064     return xchk_xattr_freemap(sc) +
0065             BITS_TO_LONGS(sc->mp->m_attr_geo->blksize);
0066 }
0067
0068 #endif  /* __XFS_SCRUB_ATTR_H__ */