Paul Eggert 258d1c44e5 Avoid quadratic behavior with delayed links ...

Do this by searching a hash table instead of a linked list.
Problem reported by Martin Dørum in https://mort.coffee/home/tar/
via Gavin Smith in:
https://lists.gnu.org/r/bug-tar/2022-07/msg00003.html
* src/extract.c: Include hash.h.
Improve performance a bit on non-birthtime hosts
(struct delayed_link.has_predecessor): New member.
(delayed_link_head): Remove, replacing with ...
(delayed_link_table): ... this new variable.  All uses
of linked list replaced with hash table.
(dl_hash, dl_compare): New functions for hash table.
(create_placeholder_file): Initialize has_predecessor.
(apply_delayed_link): New function, with body taken from
most of the old apply_delayed_link.
(apply_delayed_links): Use it.  Respect has_predecessor.
Don’t bother freeing as we are about to exit.

2022-08-15 00:07:39 -07:00

..

.gitignore

Migrate to Git

2009-03-07 16:30:44 +02:00

arith.h

Update copyright years

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buffer.c

Avoid excess lseek etc.

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checkpoint.c

Update copyright years

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common.h

Avoid excess lseek etc.

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compare.c

Avoid excess lseek etc.

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create.c

Warn “file changed as we read it” less often

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delete.c

Avoid excess lseek etc.

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exclist.c

Update copyright years

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exit.c

Update copyright years

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extract.c

Avoid quadratic behavior with delayed links

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incremen.c

Update copyright years

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list.c

Update copyright years

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Makefile.am

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map.c

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misc.c

Update copyright years

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names.c

Work around GCC bug 106428

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sparse.c

Update copyright years

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suffix.c

Update copyright years

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system.c

Avoid excess lseek etc.

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tar.c

Work around GCC bug 106436

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tar.h

Update copyright years

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transform.c

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unlink.c

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update.c

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utf8.c

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warning.c

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xattrs.c

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xattrs.h

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xheader.c

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