From: "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Jeff Hostetler <git@jeffhostetler.com>,
Johannes Schindelin <johannes.schindelin@gmx.de>,
Johannes Schindelin <johannes.schindelin@gmx.de>
Subject: [PATCH 3/4] fsmonitor: avoid overriding `cache_changed` bits
Date: Wed, 22 Mar 2023 16:00:58 +0000 [thread overview]
Message-ID: <c1c35f0f026993c493eaae3cf643b25c339205c4.1679500859.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.1497.git.1679500859.gitgitgadget@gmail.com>
From: Johannes Schindelin <johannes.schindelin@gmx.de>
As of e636a7b4d030 (read-cache: be specific what part of the index has
changed, 2014-06-13), the paradigm `cache_changed = 1` fell out of
fashion and it became a bit field instead.
This is important because some bits have specific meaning and should not
be unset without care, e.g. `SPLIT_INDEX_ORDERED`.
However, b5a816975206 (mark_fsmonitor_valid(): mark the index as changed
if needed, 2019-05-24) did use the `cache_changed` attribute as if it
were a Boolean instead of a bit field.
That not only would override the `SPLIT_INDEX_ORDERED` bit when marking
index entries as valid via the FSMonitor, but worse: it would set the
`SOMETHING_OTHER` bit (whose value is 1). This means that Git would
unnecessarily force a full index to be written out when a split index
was asked for.
Let's instead use the bit that is specifically intended to indicate
FSMonitor-triggered changes, allowing the split-index feature to work as
designed.
Noticed-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
fsmonitor.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fsmonitor.h b/fsmonitor.h
index edf7ce5203b..778707b131b 100644
--- a/fsmonitor.h
+++ b/fsmonitor.h
@@ -86,7 +86,7 @@ static inline void mark_fsmonitor_valid(struct index_state *istate, struct cache
!(ce->ce_flags & CE_FSMONITOR_VALID)) {
if (S_ISGITLINK(ce->ce_mode))
return;
- istate->cache_changed = 1;
+ istate->cache_changed |= FSMONITOR_CHANGED;
ce->ce_flags |= CE_FSMONITOR_VALID;
trace_printf_key(&trace_fsmonitor, "mark_fsmonitor_clean '%s'", ce->name);
}
--
gitgitgadget
next prev parent reply other threads:[~2023-03-22 16:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-22 16:00 [PATCH 0/4] Fix a few split-index bugs Johannes Schindelin via GitGitGadget
2023-03-22 16:00 ` [PATCH 1/4] split-index & fsmonitor: demonstrate a bug Johannes Schindelin via GitGitGadget
2023-03-23 13:39 ` Jeff Hostetler
2023-03-22 16:00 ` [PATCH 2/4] split-index; stop abusing the `base_oid` to strip the "link" extension Johannes Schindelin via GitGitGadget
2023-03-22 21:24 ` Junio C Hamano
2023-03-23 13:59 ` Jeff Hostetler
2023-03-23 16:06 ` Junio C Hamano
2023-03-23 15:22 ` Jeff Hostetler
2023-03-22 16:00 ` Johannes Schindelin via GitGitGadget [this message]
2023-03-22 16:00 ` [PATCH 4/4] unpack-trees: take care to propagate the split-index flag Johannes Schindelin via GitGitGadget
2023-03-23 14:32 ` Jeff Hostetler
2023-03-22 16:22 ` [PATCH 0/4] Fix a few split-index bugs Junio C Hamano
2023-03-26 22:45 ` [PATCH v2 " Johannes Schindelin via GitGitGadget
2023-03-26 22:45 ` [PATCH v2 1/4] split-index & fsmonitor: demonstrate a bug Johannes Schindelin via GitGitGadget
2023-03-26 22:45 ` [PATCH v2 2/4] split-index; stop abusing the `base_oid` to strip the "link" extension Johannes Schindelin via GitGitGadget
2023-03-26 22:45 ` [PATCH v2 3/4] fsmonitor: avoid overriding `cache_changed` bits Johannes Schindelin via GitGitGadget
2023-03-26 22:45 ` [PATCH v2 4/4] unpack-trees: take care to propagate the split-index flag Johannes Schindelin via GitGitGadget
2023-03-27 14:48 ` [PATCH v2 0/4] Fix a few split-index bugs Jeff Hostetler
2023-03-27 16:42 ` Junio C Hamano
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