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packed_ref_cache: increment refcount when locked

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Increment the packed_ref_cache reference count while it is locked to
prevent its being freed.

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 10:37:49 +02:00 committed by Junio C Hamano
parent 8baf2bb99a
commit 4f6b83e370
1 changed files with 7 additions and 1 deletions
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8
refs.c
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@ -820,7 +820,9 @@ struct packed_ref_cache {
/*
* Iff the packed-refs file associated with this instance is
* currently locked for writing, this points at the associated
* lock (which is owned by somebody else).
* lock (which is owned by somebody else). The referrer count
* is also incremented when the file is locked and decremented
* when it is unlocked.
*/
struct lock_file *lock;
};
@ -2099,6 +2101,8 @@ int lock_packed_refs(int flags)
/* Read the current packed-refs while holding the lock: */
packed_ref_cache = get_packed_ref_cache(&ref_cache);
packed_ref_cache->lock = &packlock;
/* Increment the reference count to prevent it from being freed: */
acquire_packed_ref_cache(packed_ref_cache);
return 0;
}
@ -2119,6 +2123,7 @@ int commit_packed_refs(void)
if (commit_lock_file(packed_ref_cache->lock))
error = -1;
packed_ref_cache->lock = NULL;
release_packed_ref_cache(packed_ref_cache);
return error;
}
@ -2131,6 +2136,7 @@ void rollback_packed_refs(void)
die("internal error: packed-refs not locked");
rollback_lock_file(packed_ref_cache->lock);
packed_ref_cache->lock = NULL;
release_packed_ref_cache(packed_ref_cache);
clear_packed_ref_cache(&ref_cache);
}