[PATCH 6/6] refs.c: enable large transactions

[Stefan Beller <sbeller@google.com>]

By closing the file descriptors after creating the lock file we are not
limiting the size of the transaction by the number of available file
descriptors.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 refs.c                | 14 +++++++++++++-
 t/t1400-update-ref.sh |  4 ++--
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/refs.c b/refs.c
index 0161667..014ef59 100644
--- a/refs.c
+++ b/refs.c
@@ -3068,7 +3068,17 @@ static ssize_t write_in_full_to_lockfile(struct lock_file *lock,
 					 const void *buf,
 					 size_t count)
 {
-	return write_in_full(lock->fd, buf, count);
+	if (lock->fd == -1) {
+		int ret;
+		if (reopen_lock_file(lock) < 0)
+			return -1;
+		ret = write_in_full(lock->fd, buf, count);
+		if (close_lock_file(lock) < 0)
+			return -1;
+		return ret;
+	} else {
+		return write_in_full(lock->fd, buf, count);
+	}
 }
 
 /*
@@ -3797,6 +3807,8 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 				    update->refname);
 			goto cleanup;
 		}
+		/* Do not keep all lock files open at the same time. */
+		close_lock_file(update->lock->lk);
 	}
 
 	/* Perform updates first so live commits remain referenced */
diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index ea98b9b..751b6dc 100755
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -1071,7 +1071,7 @@ run_with_limited_open_files () {
 
 test_lazy_prereq ULIMIT 'run_with_limited_open_files true'
 
-test_expect_failure ULIMIT 'large transaction creating branches does not burst open file limit' '
+test_expect_success ULIMIT 'large transaction creating branches does not burst open file limit' '
 (
 	for i in $(seq 33)
 	do
@@ -1082,7 +1082,7 @@ test_expect_failure ULIMIT 'large transaction creating branches does not burst o
 )
 '
 
-test_expect_failure ULIMIT 'large transaction deleting branches does not burst open file limit' '
+test_expect_success ULIMIT 'large transaction deleting branches does not burst open file limit' '
 (
 	for i in $(seq 33)
 	do
-- 
2.2.1.62.g3f15098