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Although directory entry and parent pointer recordsets look very similar (name -> ino), there's one major difference between them: a file can be hardlinked from multiple parent directories with the same filename. This is common in shared container environments where a base directory tree might be hardlink-copied multiple times. IOWs the same 'ls' program might be hardlinked to multiple /srv/*/bin/ls paths. We don't want parent pointer operations to bog down on hash collisions between the same dirent name, so create a special hash function that mixes in the parent directory inode number. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
21 lines
624 B
C
21 lines
624 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2022-2024 Oracle.
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* All Rights Reserved.
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*/
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#ifndef __XFS_PARENT_H__
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#define __XFS_PARENT_H__
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/* Metadata validators */
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bool xfs_parent_namecheck(unsigned int attr_flags, const void *name,
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size_t length);
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bool xfs_parent_valuecheck(struct xfs_mount *mp, const void *value,
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size_t valuelen);
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xfs_dahash_t xfs_parent_hashval(struct xfs_mount *mp, const uint8_t *name,
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int namelen, xfs_ino_t parent_ino);
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xfs_dahash_t xfs_parent_hashattr(struct xfs_mount *mp, const uint8_t *name,
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int namelen, const void *value, int valuelen);
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#endif /* __XFS_PARENT_H__ */
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