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[PATCH v7 39/42] refs.c: add a new flag for transaction delete for refs we know are packed only

From
Ronnie Sahlberg <sahlberg@google.com>
Date
May 14, 2014, 21:17 UTC
Message-ID
<1400102236-30082-40-git-send-email-sahlberg@google.com>
In-Reply-To
<1400102236-30082-1-git-send-email-sahlberg@google.com>

Add a new flag REF_ISPACKONLY that we can use in ref_transaction_delete. This flag indicates that the ref does not exist as a loose ref andf only as a packed ref. If this is the case we then change the commit code so that we skip taking out a lock file and we skip calling delete_ref_loose. Check for this flag and die(BUG:...) if used with _update or _create.

At the start of the transaction, before we even start locking any refs, we add all such REF_ISPACKONLY refs to delnames so that we have a list of all pack only refs that we will be deleting during this transaction.

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
---
 refs.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
diff --git a/refs.c b/refs.c
index a376dd6..6b8b7fe 100644
--- a/refs.c
+++ b/refs.c
@@ -33,6 +33,10 @@ static inline int bad_ref_char(int ch)
  *  pruned.
  */
 #define REF_ISPRUNING	0x0100
+/** Deletion of a ref that only exists as a packed ref in which case we do not
+ *  need to lock the loose ref during the transaction.
+ */
+#define REF_ISPACKONLY	0x0200
 
 /*
  * Try to read one refname component from the front of refname.  Return
@@ -3335,6 +3339,9 @@ int ref_transaction_update(struct ref_transaction *transaction,
 	if (transaction->status != REF_TRANSACTION_OPEN)
 		die("BUG: update on transaction that is not open");
 
+	if (flags & REF_ISPACKONLY)
+		die("BUG: REF_ISPACKONLY can not be used with updates");
+
 	update = add_update(transaction, refname);
 	hashcpy(update->new_sha1, new_sha1);
 	update->flags = flags;
@@ -3359,6 +3366,9 @@ int ref_transaction_create(struct ref_transaction *transaction,
 	if (transaction->status != REF_TRANSACTION_OPEN)
 		die("BUG: create on transaction that is not open");
 
+	if (flags & REF_ISPACKONLY)
+		die("BUG: REF_ISPACKONLY can not be used with creates");
+
 	update = add_update(transaction, refname);
 
 	hashcpy(update->new_sha1, new_sha1);
@@ -3472,10 +3482,20 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	if (ret)
 		goto cleanup;
 
+	for (i = 0; i < n; i++) {
+		struct ref_update *update = updates[i];
+
+		if (update->flags & REF_ISPACKONLY)
+			delnames[delnum++] = update->refname;
+	}
+
 	/* Acquire all locks while verifying old values */
 	for (i = 0; i < n; i++) {
 		struct ref_update *update = updates[i];
 
+		if (update->flags & REF_ISPACKONLY)
+			continue;
+
 		update->lock = lock_ref_sha1_basic(update->refname,
 						   (update->have_old ?
 						    update->old_sha1 :
@@ -3513,6 +3533,9 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	for (i = 0; i < n; i++) {
 		struct ref_update *update = updates[i];
 
+		if (update->flags & REF_ISPACKONLY)
+			continue;
+
 		if (update->lock) {
 			ret |= delete_ref_loose(update->lock, update->type);
 			if (!(update->flags & REF_ISPRUNING))

-- 
2.0.0.rc3.471.g2055d11.dirty
Previous: Ronnie SahlbergNext: Ronnie Sahlberg
Message 40 of 43 in “Use ref transactions for all ref updates”
  1. 00/42 Use ref transactions for all ref updatesRonnie Sahlberg, May 14, 2014
  2. 01/42 refs.c: constify the sha arguments for ref_transaction_create|delete|updateRonnie Sahlberg, May 14, 2014
  3. 02/42 refs.c: allow passing NULL to ref_transaction_freeRonnie Sahlberg, May 14, 2014
  4. 03/42 refs.c: add a strbuf argument to ref_transaction_commit for error loggingRonnie Sahlberg, May 14, 2014
  5. 04/42 refs.c: make ref_update_reject_duplicates take a strbuf argument for errorsRonnie Sahlberg, May 14, 2014
  6. 05/42 update-ref.c: log transaction error from the update_refRonnie Sahlberg, May 14, 2014
  7. 06/42 refs.c: make update_ref_write update a strbuf on failureRonnie Sahlberg, May 14, 2014
  8. 07/42 refs.c: remove the onerr argument to ref_transaction_commitRonnie Sahlberg, May 14, 2014
  9. 08/42 refs.c: change ref_transaction_update() to do error checking and return statusRonnie Sahlberg, May 14, 2014
  10. 09/42 refs.c: change ref_transaction_create to do error checking and return statusRonnie Sahlberg, May 14, 2014
  11. 10/42 refs.c: ref_transaction_delete to check for error and return statusRonnie Sahlberg, May 14, 2014
  12. 11/42 tag.c: use ref transactions when doing updatesRonnie Sahlberg, May 14, 2014
  13. 12/42 replace.c: use the ref transaction functions for updatesRonnie Sahlberg, May 14, 2014
  14. 13/42 commit.c: use ref transactions for updatesRonnie Sahlberg, May 14, 2014
  15. 14/42 sequencer.c: use ref transactions for all ref updatesRonnie Sahlberg, May 14, 2014
  16. 15/42 fast-import.c: change update_branch to use ref transactionsRonnie Sahlberg, May 14, 2014
  17. 16/42 branch.c: use ref transaction for all ref updatesRonnie Sahlberg, May 14, 2014
  18. 17/42 refs.c: change update_ref to use a transactionRonnie Sahlberg, May 14, 2014
  19. 18/42 refs.c: free the transaction before returning when number of updates is 0Ronnie Sahlberg, May 14, 2014
  20. 19/42 refs.c: ref_transaction_commit should not free the transactionRonnie Sahlberg, May 14, 2014
  21. 20/42 fetch.c: clear errno before calling functions that might set itRonnie Sahlberg, May 14, 2014
  22. 21/42 fetch.c: change s_update_ref to use a ref transactionRonnie Sahlberg, May 14, 2014
  23. 22/42 fetch.c: use a single ref transaction for all ref updatesRonnie Sahlberg, May 14, 2014
  24. 23/42 receive-pack.c: use a reference transaction for updating the refsRonnie Sahlberg, May 14, 2014
  25. 24/42 fast-import.c: use a ref transaction when dumping tagsRonnie Sahlberg, May 14, 2014
  26. 25/42 walker.c: use ref transaction for ref updatesRonnie Sahlberg, May 14, 2014
  27. 26/42 refs.c: make write_ref_sha1 staticRonnie Sahlberg, May 14, 2014
  28. 27/42 refs.c: make lock_ref_sha1 staticRonnie Sahlberg, May 14, 2014
  29. 28/42 refs.c: add transaction.status and track OPEN/CLOSED/ERRORRonnie Sahlberg, May 14, 2014
  30. 29/42 refs.c: remove the update_ref_lock functionRonnie Sahlberg, May 14, 2014
  31. 30/42 refs.c: remove the update_ref_write functionRonnie Sahlberg, May 14, 2014
  32. 31/42 refs.c: remove lock_ref_sha1Ronnie Sahlberg, May 14, 2014
  33. 32/42 refs.c: make prune_ref use a transaction to delete the refRonnie Sahlberg, May 14, 2014
  34. 33/42 refs.c: make delete_ref use a transactionRonnie Sahlberg, May 14, 2014
  35. 34/42 refs.c: pass the ref log message to _create/delete/update instead of _commitRonnie Sahlberg, May 14, 2014
  36. 35/42 refs.c: pass NULL as *flags to read_ref_fullRonnie Sahlberg, May 14, 2014
  37. 36/42 refs.c: pack all refs before we start to rename a refRonnie Sahlberg, May 14, 2014
  38. 37/42 refs.c: move the check for valid refname to lock_ref_sha1_basicRonnie Sahlberg, May 14, 2014
  39. 38/42 refs.c: call lock_ref_sha1_basic directly from commitRonnie Sahlberg, May 14, 2014
  40. 39/42 refs.c: add a new flag for transaction delete for refs we know are packed onlyRonnie Sahlberg, May 14, 2014
  41. 40/42 refs.c: pass a skip list to name_conflict_fnRonnie Sahlberg, May 14, 2014
  42. 41/42 refs.c: make rename_ref use a transactionRonnie Sahlberg, May 14, 2014
  43. 42/42 refs.c: remove forward declaration of write_ref_sha1Ronnie Sahlberg, May 14, 2014

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