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commit 0a6ffd3a36e37569cc3fd6d14e0c7789c7e6a9e7
Author: Milos Nikic <[email protected]>
Date: Wed Sep 30 21:00:08 2026 -0700
ext2fs: Rework intercept cache in the journal.
This patch replaces the fixed-size, bitmask-managed Lifeboat array with an
O(1) intrusive linked-list allocator tied directly to the transaction map.
Previously, when the Mach VM pager rushed a block locked by an active
transaction, the payload was intercepted and stored in a global array
indexed via an 8-slot `uint64_t` bitmask. This approach required expensive
index lookups, O(N) allocation loops, and compare-and-swap checks during
physical flushing to avoid race conditions.
By embedding an intercepted_data pointer directly into journal_buffer_t,
the intercepted memory is now exclusively owned by the transaction itself.
The global array is replaced with a simple, pre-allocated linked list of
4KB chunks, granting O(1) push/pop allocations and entirely eliminating
index collision hazards.
Cache coherence in journal_store_read is preserved by checking the
`RUNNING` transaction's pointers before the COMMITTING transaction's
pointers, natively shadowing older intercepted data.
Message-ID: <[email protected]>
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Summary of changes:
ext2fs/journal.c | 356 ++++++++++++++++++++++++-------------------------------
1 file changed, 155 insertions(+), 201 deletions(-)
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