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[PATCH v3 17/17] rename_tmp_log(): on SCLD_VANISHED, retry

From
Michael Haggerty <mhagger@alum.mit.edu>
Date
Jan 18, 2014, 22:49 UTC
Message-ID
<1390085341-2553-18-git-send-email-mhagger@alum.mit.edu>
In-Reply-To
<1390085341-2553-1-git-send-email-mhagger@alum.mit.edu>

If safe_create_leading_directories() fails because a file along the path unexpectedly vanished, try again from the beginning. Try at most 4 times.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/refs.c b/refs.c
index 134d5aa..0148bbd 100644
--- a/refs.c
+++ b/refs.c
@@ -2533,7 +2533,14 @@ static int rename_tmp_log(const char *newrefname)
 	int attempts_remaining = 4;
 
  retry:
-	if (safe_create_leading_directories(git_path("logs/%s", newrefname))) {
+	switch (safe_create_leading_directories(git_path("logs/%s", newrefname))) {
+	case SCLD_OK:
+		break; /* success */
+	case SCLD_VANISHED:
+		if (--attempts_remaining > 0)
+			goto retry;
+		/* fall through */
+	default:
 		error("unable to create directory for %s", newrefname);
 		return -1;
 	}

-- 
1.8.5.2
Previous: Michael Haggerty
Message 18 of 18 in “Fix some mkdir/rmdir races”
  1. 00/17 Fix some mkdir/rmdir racesMichael Haggerty, Jan 18, 2014
  2. 01/17 safe_create_leading_directories(): fix format of "if" chainingMichael Haggerty, Jan 18, 2014
  3. 02/17 safe_create_leading_directories(): reduce scope of local variableMichael Haggerty, Jan 18, 2014
  4. 03/17 safe_create_leading_directories(): add explicit "slash" pointerMichael Haggerty, Jan 18, 2014
  5. 04/17 safe_create_leading_directories(): rename local variableMichael Haggerty, Jan 18, 2014
  6. 05/17 safe_create_leading_directories(): split on first of multiple slashesMichael Haggerty, Jan 18, 2014
  7. 06/17 safe_create_leading_directories(): always restore slash at end of loopMichael Haggerty, Jan 18, 2014
  8. 07/17 safe_create_leading_directories(): introduce enum for return valuesMichael Haggerty, Jan 18, 2014
  9. 08/17 cmd_init_db(): when creating directories, handle errors conservativelyMichael Haggerty, Jan 18, 2014
  10. 09/17 safe_create_leading_directories(): add new error value SCLD_VANISHEDMichael Haggerty, Jan 18, 2014
  11. 10/17 lock_ref_sha1_basic(): on SCLD_VANISHED, retryMichael Haggerty, Jan 18, 2014
  12. 11/17 lock_ref_sha1_basic(): if locking fails with ENOENT, retryMichael Haggerty, Jan 18, 2014
  13. 12/17 remove_dir_recurse(): tighten condition for removing unreadable dirMichael Haggerty, Jan 18, 2014
  14. 13/17 remove_dir_recurse(): handle disappearing files and directoriesMichael Haggerty, Jan 18, 2014
  15. 14/17 rename_ref(): extract function rename_tmp_log()Michael Haggerty, Jan 18, 2014
  16. 15/17 rename_tmp_log(): handle a possible mkdir/rmdir raceMichael Haggerty, Jan 18, 2014
  17. 16/17 rename_tmp_log(): limit the number of remote_empty_directories() attemptsMichael Haggerty, Jan 18, 2014
  18. 17/17 rename_tmp_log(): on SCLD_VANISHED, retryMichael Haggerty, Jan 18, 2014

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