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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2021 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#ifndef __XFS_SCRUB_NLINKS_H__
#define __XFS_SCRUB_NLINKS_H__
/* Live link count control structure. */
struct xchk_nlink_ctrs {
struct xfs_scrub *sc;
/* Shadow link count data and its mutex. */
struct xfarray *nlinks;
struct mutex lock;
/*
* The collection step uses a separate iscan context from the compare
* step because the collection iscan coordinates live updates to the
* observation data while this scanner is running. The compare iscan
* is secondary and can be reinitialized as needed.
*/
struct xchk_iscan collect_iscan;
struct xchk_iscan compare_iscan;
/*
* Hook into bumplink/droplink so that we can receive live updates
* from other writer threads.
*/
struct notifier_block nlink_delta_hook;
};
struct xchk_nlink {
/* Links from a parent directory to this inode. */
xfs_nlink_t parent;
/* Links from children of this inode (e.g. dot and dotdot). */
xfs_nlink_t child;
/* Record state flags */
unsigned int flags;
};
/* This data item was seen by the check-time compare function. */
#define XCHK_NLINK_COMPARE_SCANNED (1U << 0)
/* Compute total link count, using large enough variables to detect overflow. */
static inline uint64_t
xchk_nlink_total(const struct xchk_nlink *live)
{
uint64_t ret = live->parent;
return ret + live->child;
}
#endif /* __XFS_SCRUB_NLINKS_H__ */
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