[PATCH/RFC v3 0/13] Introduce index file format version 5

Previous rounds of this series were on $gmane/202752 and $gmane/202923.

This round includes a major change, as it is splitting up read-cache.c into read-cache.c, read-cache-v2.c and read-cache-v5.c. It uses index->ops to call the specific functions as suggested by Duy.

It also changes the index format slightly, removing the size from the stat_crc and adding it as separate field, as suggested by Robin. This makes the format incompatible with the one in the previous two series.

[PATCH/RFC 01/13] Move index v2 specific functions to their own file This previously was patch 1/2/3/4, but since the code is now moved to a different file, it seems to make more sense to do it in one patch. Also moved the size check to the verify_hdr functions for the respective index formats.

[PATCH/RFC 02/13] t2104: Don't fail for index versions other than Do the update index at the very beginning.

[PATCH/RFC 03/13] t3700: Avoid interfering with the racy code Instead of sleeping for a second, test-chmtime now uses an absolute time, to avoid the racy code.

[PATCH/RFC 04/13] Add documentation of the index-v5 file format Added the size to the cache-entries.

[PATCH/RFC 05/13] Make in-memory format aware of stat_crc Removed size from the stat_crc.

[PATCH/RFC 06/13] Read index-v5 Changed the pointer arithmetic to not use void * directly, by casting it to a char * first.

[PATCH/RFC 07/13] Read resolve-undo data [PATCH/RFC 08/13] Read cache-tree in index-v5 [PATCH/RFC 09/13] Write index-v5 [PATCH/RFC 10/13] Write index-v5 cache-tree data [PATCH/RFC 11/13] Write resolve-undo data for index-v5 [PATCH/RFC 12/13] update-index.c: always rewrite the index when Instead of using a force-rewrite option, always rewrite the index if a index-version is given.

[PATCH/RFC 13/13] p0002-index.sh: add perf test for the index Instead of using the force-rewrite option, which was removed from update-index, use git update-index --index-version=n for doing the preformance testing.