By writing the values to the lock file early we have a better sequence
of system calls. Before this commit we had
open(), close(), open(), fdopen(), write(), fclose(), rename()
Now there is:
open(), fdopen(), write(), fclose(), rename()
The first four operations are performed in the first loop of
ref_transaction_commit ("/* Acquire all locks while verifying
old values */"), while the renameing is left to the next loop.
Signed-off-by: Stefan Beller <sbel...@google.com>
---
refs.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/refs.c b/refs.c
index c108c95..3d1890f 100644
--- a/refs.c
+++ b/refs.c
@@ -3767,6 +3767,15 @@ int ref_transaction_commit(struct ref_transaction
*transaction,
update->refname);
goto cleanup;
}
+ if (!is_null_sha1(update->new_sha1)) {
+ if (write_ref_sha1(update->lock, update->new_sha1,
+ update->msg)) {
+ strbuf_addf(err, "Cannot update the ref '%s'.",
+ update->refname);
+ ret = TRANSACTION_GENERIC_ERROR;
+ goto cleanup;
+ }
+ }
/* Do not keep all lock files open at the same time. */
close_ref(update->lock);
}
@@ -3776,9 +3785,7 @@ int ref_transaction_commit(struct ref_transaction
*transaction,
struct ref_update *update = updates[i];
if (!is_null_sha1(update->new_sha1)) {
- if (write_ref_sha1(update->lock, update->new_sha1,
- update->msg)
- || commit_ref(update->lock, update->new_sha1)) {
+ if (commit_ref(update->lock, update->new_sha1)) {
strbuf_addf(err, "Cannot update the ref '%s'.",
update->refname);
ret = TRANSACTION_GENERIC_ERROR;
--
2.2.1.62.g3f15098
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