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refs: do not invalidate the packed-refs cache unnecessarily 

Now that we keep track of the packed-refs file metadata, we can detect
when the packed-refs file has been modified since we last read it, and
we do so automatically every time that get_packed_ref_cache() is
called.  So there is no need to invalidate the cache automatically
when lock_packed_refs() is called; usually the old copy will still be
valid.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Haggerty 2013-06-20 10:37:54 +02:00 committed by Junio C Hamano
parent 98eeb09e8a
commit 5d478f5ca1
1 changed files with 6 additions and 3 deletions
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9
refs.c
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@ -2136,11 +2136,14 @@ int lock_packed_refs(int flags)
{
struct packed_ref_cache *packed_ref_cache;
/* Discard the old cache because it might be invalid: */
clear_packed_ref_cache(&ref_cache);
if (hold_lock_file_for_update(&packlock, git_path("packed-refs"), flags) < 0)
return -1;
/* Read the current packed-refs while holding the lock: */
/*
* Get the current packed-refs while holding the lock. If the
* packed-refs file has been modified since we last read it,
* this will automatically invalidate the cache and re-read
* the packed-refs file.
*/
packed_ref_cache = get_packed_ref_cache(&ref_cache);
packed_ref_cache->lock = &packlock;
/* Increment the reference count to prevent it from being freed: */