From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 15 Feb 2018 22:55:42 +0000 (-0800)
Subject: Merge branch 'kg/packed-ref-cache-fix'
X-Git-Tag: v2.17.0-rc0~98
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/9db22910f74b64764d4fb4e17f8aef4eb5aa6af0

Merge branch 'kg/packed-ref-cache-fix'

Avoid mmapping small files while using packed refs (especially ones
with zero size, which would cause later munmap() to fail).

* kg/packed-ref-cache-fix:
packed_ref_cache: don't use mmap() for small files
load_contents(): don't try to mmap an empty file
packed_ref_iterator_begin(): make optimization more general
find_reference_location(): make function safe for empty snapshots
create_snapshot(): use `xmemdupz()` rather than a strbuf
struct snapshot: store `start` rather than `header_len`
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9db22910f74b64764d4fb4e17f8aef4eb5aa6af0