diff options
Diffstat (limited to 'fs/xfs/scrub/nlinks.h')
| -rw-r--r-- | fs/xfs/scrub/nlinks.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/fs/xfs/scrub/nlinks.h b/fs/xfs/scrub/nlinks.h new file mode 100644 index 000000000000..0ece2ab5dd38 --- /dev/null +++ b/fs/xfs/scrub/nlinks.h @@ -0,0 +1,56 @@ +/* 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__ */ |