git/list[1] front-page[2] threads[3] people[4] search[5] about
 

[PATCH v2 16/21] packed_read_raw_ref(): read the reference from the mmapped buffer

From
Michael Haggerty <mhagger@alum.mit.edu>
Date
Sep 19, 2017, 06:22 UTC
Message-ID
<b67c03b2d47ab503e27a2dd3918af42b59766bdb.1505799700.git.mhagger@alum.mit.edu>
In-Reply-To
<cover.1505799700.git.mhagger@alum.mit.edu>

Instead of reading the reference from the `ref_cache`, read it directly from the mmapped buffer.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs/packed-backend.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index 53d0b7e3d6..2cf2f7f73d 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -875,18 +875,22 @@ static int packed_read_raw_ref(struct ref_store *ref_store,
 {
 	struct packed_ref_store *refs =
 		packed_downcast(ref_store, REF_STORE_READ, "read_raw_ref");
-
-	struct ref_entry *entry;
+	struct packed_ref_cache *packed_refs = get_packed_ref_cache(refs);
+	const char *rec;
 
 	*type = 0;
 
-	entry = get_packed_ref(refs, refname);
-	if (!entry) {
+	rec = find_reference_location(packed_refs, refname, 1);
+
+	if (!rec) {
+		/* refname is not a packed reference. */
 		errno = ENOENT;
 		return -1;
 	}
 
-	hashcpy(sha1, entry->u.value.oid.hash);
+	if (get_sha1_hex(rec, sha1))
+		die_invalid_line(refs->path, rec, packed_refs->eof - rec);
+
 	*type = REF_ISPACKED;
 	return 0;
 }

-- 
2.14.1
Previous: Michael HaggertyNext: Michael Haggerty
Message 30 of 40 in “Read `packed-refs` using mmap()”
  1. 00/21 Read `packed-refs` using mmap()Michael Haggerty, Sep 19, 2017
  2. 02/21 prefix_ref_iterator: break when we leave the prefixMichael Haggerty, Sep 19, 2017
  3. Stefan BellerSep 20, 2017
  4. Jeff KingSep 21, 2017
  5. Stefan BellerSep 21, 2017
  6. Michael HaggertySep 21, 2017
  7. 04/21 die_unterminated_line(), die_invalid_line(): new functionsMichael Haggerty, Sep 19, 2017
  8. 05/21 read_packed_refs(): use mmap to read the `packed-refs` fileMichael Haggerty, Sep 19, 2017
  9. 08/21 read_packed_refs(): read references with minimal copyingMichael Haggerty, Sep 19, 2017
  10. Jeff KingSep 20, 2017
  11. Michael HaggertySep 21, 2017
  12. 09/21 packed_ref_cache: remember the file-wide peeling stateMichael Haggerty, Sep 19, 2017
  13. 10/21 mmapped_ref_iterator: add iterator over a packed-refs fileMichael Haggerty, Sep 19, 2017
  14. 11/21 mmapped_ref_iterator_advance(): no peeled value for broken refsMichael Haggerty, Sep 19, 2017
  15. Jeff KingSep 20, 2017
  16. 12/21 packed-backend.c: reorder some definitionsMichael Haggerty, Sep 19, 2017
  17. 13/21 packed_ref_cache: keep the `packed-refs` file mmapped if possibleMichael Haggerty, Sep 19, 2017
  18. Michael HaggertySep 19, 2017
  19. Junio C HamanoSep 24, 2017
  20. Jeff KingSep 20, 2017
  21. Jeff KingSep 20, 2017
  22. Michael HaggertySep 21, 2017
  23. 14/21 read_packed_refs(): ensure that references are ordered when readMichael Haggerty, Sep 19, 2017
  24. Jeff KingSep 20, 2017
  25. Michael HaggertySep 21, 2017
  26. Johannes SchindelinSep 25, 2017
  27. 15/21 packed_ref_iterator_begin(): iterate using `mmapped_ref_iterator`Michael Haggerty, Sep 19, 2017
  28. 18/21 packed_ref_store: get rid of the `ref_cache` entirelyMichael Haggerty, Sep 19, 2017
  29. 19/21 ref_cache: remove support for storing peeled valuesMichael Haggerty, Sep 19, 2017
  30. 16/21 packed_read_raw_ref(): read the reference from the mmapped bufferMichael Haggerty, Sep 19, 2017
  31. 20/21 mmapped_ref_iterator: inline into `packed_ref_iterator`Michael Haggerty, Sep 19, 2017
  32. 21/21 packed-backend.c: rename a bunch of things and update commentsMichael Haggerty, Sep 19, 2017
  33. 17/21 ref_store: implement `refs_peel_ref()` genericallyMichael Haggerty, Sep 19, 2017
  34. 06/21 read_packed_refs(): only check for a header at the top of the fileMichael Haggerty, Sep 19, 2017
  35. 07/21 read_packed_refs(): make parsing of the header line more robustMichael Haggerty, Sep 19, 2017
  36. 01/21 ref_iterator: keep track of whether the iterator output is orderedMichael Haggerty, Sep 19, 2017
  37. 03/21 packed_ref_cache: add a backlink to the associated `packed_ref_store`Michael Haggerty, Sep 19, 2017
  38. Johannes SchindelinSep 19, 2017
  39. Jeff KingSep 20, 2017
  40. Johannes SchindelinSep 25, 2017

Read the whole thread, see it on lore, or plain text.

$ cat FOOTERMessages come from the public archive at lore.kernel.org/git, fetched every hour. The front page is chosen and written each morning by an AI editor and can be wrong; the threads themselves are the record. About and API. For agents: an MCP server at https://gitlist.dev/mcp, and any thread, story or person page as Markdown by adding .md to its URL (or sending Accept: text/markdown). Details in /llms.txt.