From: Jeff King <peff@peff.net>
To: "brian m. carlson" <sandals@crustytoothpaste.net>,
git@vger.kernel.org, "René Scharfe" <l.s.r@web.de>,
"Duy Nguyen" <pclouds@gmail.com>
Subject: Re: [PATCH 04/31] pack-bitmap: replace sha1_to_hex
Date: Wed, 13 Feb 2019 23:41:46 -0500 [thread overview]
Message-ID: <20190214044145.GA19071@sigill.intra.peff.net> (raw)
In-Reply-To: <20190213000007.GG684736@genre.crustytoothpaste.net>
On Wed, Feb 13, 2019 at 12:00:07AM +0000, brian m. carlson wrote:
> On Tue, Feb 12, 2019 at 01:37:49AM -0500, Jeff King wrote:
> > On Tue, Feb 12, 2019 at 01:22:29AM +0000, brian m. carlson wrote:
> > > -static uint32_t find_object_pos(const unsigned char *sha1)
> > > +static uint32_t find_object_pos(const unsigned char *hash)
> >
> > Isn't this really just a "struct object_id"? Why don't we want to use
> > that here?
> >
> > I suspect it may be partially because our khash is storing raw sha1s.
> > But shouldn't we also be converted that to store object_ids?
>
> I think probably there are some more places that we could convert here.
> There may have been one or two places that weren't convertible because
> we ended up passing data from some sort of buffer around. I'll take
> another look.
Thanks. I don't want to derail you too much if you have a series of
other changes on top. And moving to "hash" here is a step in the right
direction. But if we can take it all the way to object_id while we're
looking at it, I think that's preferable.
> > > hash_pos = kh_put_sha1(index->bitmaps, stored->oid.hash, &ret);
> >
> > This last line (which is actually from the previous patch) is going to
> > always truncate the stored data to 20 bytes, isn't it?
>
> No, I don't think it does. The _sha1 variant stores pointers to unsigned
> char, while the _oid variant stores the entire struct object_id (not
> just a pointer to it). We don't care how much data the pointer points
> to.
Oh, you're right. I was thinking it actually stored the 20-byte
sequences, but I was just reading it wrong. Sorry for the confusion.
> > I think we need to define a kh_oid. We have the "set" version already in
> > oidset.[ch]; I think we need to make that more public.
>
> I wrote this quite a bit before that code came in, which is probably why
> I didn't do that originally. I seem to recall last time I looked at this
> that there was some reason that hoisting this didn't work as I expected
> due to header include order, but I'll take a look and see if I can
> figure out a way to do this.
Great, thanks!
-Peff
next prev parent reply other threads:[~2019-02-14 4:41 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-12 1:22 [PATCH 00/31] Hash function transition part 16 brian m. carlson
2019-02-12 1:22 ` [PATCH 01/31] t/lib-submodule-update: use appropriate length constant brian m. carlson
2019-02-12 1:22 ` [PATCH 02/31] pack-bitmap: make bitmap header handling hash agnostic brian m. carlson
2019-02-12 1:22 ` [PATCH 03/31] pack-bitmap: convert struct stored_bitmap to object_id brian m. carlson
2019-02-12 1:22 ` [PATCH 04/31] pack-bitmap: replace sha1_to_hex brian m. carlson
2019-02-12 6:37 ` Jeff King
2019-02-13 0:00 ` brian m. carlson
2019-02-14 4:41 ` Jeff King [this message]
2019-02-12 1:22 ` [PATCH 05/31] pack-bitmap: switch hard-coded constants to the_hash_algo brian m. carlson
2019-02-12 11:13 ` Ævar Arnfjörð Bjarmason
2019-02-12 1:22 ` [PATCH 06/31] submodule: avoid hard-coded constants brian m. carlson
2019-02-12 1:22 ` [PATCH 07/31] notes-merge: switch to use the_hash_algo brian m. carlson
2019-02-12 1:22 ` [PATCH 08/31] notes: make hash size independent brian m. carlson
2019-02-12 1:37 ` Eric Sunshine
2019-02-12 1:42 ` brian m. carlson
2019-02-12 1:22 ` [PATCH 09/31] notes: replace sha1_to_hex brian m. carlson
2019-02-12 1:22 ` [PATCH 10/31] object-store: rename and expand packed_git's sha1 member brian m. carlson
2019-02-12 3:32 ` Eric Sunshine
2019-02-14 3:33 ` brian m. carlson
2019-02-12 1:22 ` [PATCH 11/31] builtin/name-rev: make hash-size independent brian m. carlson
2019-02-12 1:22 ` [PATCH 12/31] fast-import: " brian m. carlson
2019-02-12 3:44 ` Eric Sunshine
2019-02-12 23:36 ` brian m. carlson
2019-02-12 1:22 ` [PATCH 13/31] fast-import: replace sha1_to_hex brian m. carlson
2019-02-12 1:22 ` [PATCH 14/31] builtin/am: make hash size independent brian m. carlson
2019-02-12 1:22 ` [PATCH 15/31] builtin/pull: make hash-size independent brian m. carlson
2019-02-12 3:47 ` Eric Sunshine
2019-02-12 1:22 ` [PATCH 16/31] http-push: convert to use the_hash_algo brian m. carlson
2019-02-12 1:22 ` [PATCH 17/31] http-backend: allow 64-character hex names brian m. carlson
2019-02-12 1:22 ` [PATCH 18/31] http-push: remove remaining uses of sha1_to_hex brian m. carlson
2019-02-12 1:22 ` [PATCH 19/31] http-walker: replace sha1_to_hex brian m. carlson
2019-02-12 3:51 ` Eric Sunshine
2019-02-12 1:22 ` [PATCH 20/31] http: replace hard-coded constant with the_hash_algo brian m. carlson
2019-02-12 1:22 ` [PATCH 21/31] http: compute hash of downloaded objects using the_hash_algo brian m. carlson
2019-02-12 1:22 ` [PATCH 22/31] http: replace sha1_to_hex brian m. carlson
2019-02-12 1:22 ` [PATCH 23/31] remote-curl: make hash size independent brian m. carlson
2019-02-12 11:11 ` Ævar Arnfjörð Bjarmason
2019-02-12 1:22 ` [PATCH 24/31] archive-tar: " brian m. carlson
2019-02-12 7:20 ` René Scharfe
2019-02-12 17:33 ` René Scharfe
2019-02-13 0:11 ` brian m. carlson
2019-02-12 1:22 ` [PATCH 25/31] archive: convert struct archiver_args to object_id brian m. carlson
2019-02-12 1:22 ` [PATCH 26/31] refspec: make hash size independent brian m. carlson
2019-02-12 1:22 ` [PATCH 27/31] builtin/difftool: use parse_oid_hex brian m. carlson
2019-02-12 8:27 ` Eric Sunshine
2019-02-12 1:22 ` [PATCH 28/31] dir: make untracked cache extension hash size independent brian m. carlson
2019-02-12 11:08 ` Ævar Arnfjörð Bjarmason
2019-02-13 0:30 ` brian m. carlson
2019-02-12 1:22 ` [PATCH 29/31] read-cache: read data in a hash-independent way brian m. carlson
2019-02-12 1:22 ` [PATCH 30/31] Git.pm: make hash size independent brian m. carlson
2019-02-12 10:59 ` Ævar Arnfjörð Bjarmason
2019-02-18 19:09 ` brian m. carlson
2019-02-18 21:00 ` Ævar Arnfjörð Bjarmason
2019-02-12 1:22 ` [PATCH 31/31] gitweb: " brian m. carlson
2019-02-12 10:57 ` Ævar Arnfjörð Bjarmason
2019-02-12 11:15 ` [PATCH 00/31] Hash function transition part 16 Ævar Arnfjörð Bjarmason
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