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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_SCRUB_ATTR_H__
#define __XFS_SCRUB_ATTR_H__
/*
* Temporary storage for online scrub and repair of extended attributes.
*/
struct xchk_xattr_buf {
/* Size of @buf, in bytes. */
size_t sz;
/*
* Memory buffer -- either used for extracting attr values while
* walking the attributes; or for computing attr block bitmaps when
* checking the attribute tree.
*
* Each bitmap contains enough bits to track every byte in an attr
* block (rounded up to the size of an unsigned long). The attr block
* used space bitmap starts at the beginning of the buffer; the free
* space bitmap follows immediately after; and we have a third buffer
* for storing intermediate bitmap results.
*/
uint8_t buf[0];
};
/* A place to store attribute values. */
static inline uint8_t *
xchk_xattr_valuebuf(
struct xfs_scrub *sc)
{
struct xchk_xattr_buf *ab = sc->buf;
return ab->buf;
}
/* A bitmap of space usage computed by walking an attr leaf block. */
static inline unsigned long *
xchk_xattr_usedmap(
struct xfs_scrub *sc)
{
struct xchk_xattr_buf *ab = sc->buf;
return (unsigned long *)ab->buf;
}
/* A bitmap of free space computed by walking attr leaf block free info. */
static inline unsigned long *
xchk_xattr_freemap(
struct xfs_scrub *sc)
{
return xchk_xattr_usedmap(sc) +
BITS_TO_LONGS(sc->mp->m_attr_geo->blksize);
}
/* A bitmap used to hold temporary results. */
static inline unsigned long *
xchk_xattr_dstmap(
struct xfs_scrub *sc)
{
return xchk_xattr_freemap(sc) +
BITS_TO_LONGS(sc->mp->m_attr_geo->blksize);
}
int xchk_setup_xattr_buf(struct xfs_scrub *sc, size_t value_size,
xfs_km_flags_t flags);
#endif /* __XFS_SCRUB_ATTR_H__ */
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