xfs: create a hashname function for parent pointers

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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>

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Darrick J. Wong 2024-04-22 09:47:46 -07:00

parent 7dba4a5fe1

commit fb102fe7fe

4 changed files with 59 additions and 0 deletions

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3

fs/xfs/libxfs/xfs_attr.c

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47

fs/xfs/libxfs/xfs_parent.c

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5

fs/xfs/libxfs/xfs_parent.h

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4

fs/xfs/scrub/attr.c

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