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Test LWB buffer overflow for block cloning

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PR#15634 removes 128K into 2x68K LWB split optimization, since it
was found to cause LWB buffer overflow while trying to write 128KB
TX_CLONE_RANGE record with 1022 block pointers into 68KB buffer,
with multiple VDEVs ZIL.

This commit adds a test for this particular scenario by writing
maximum sizes TX_CLONE_RANE record with 1022 block pointers into
68KB buffer, with two SLOG devices.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by:  Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Signed-off-by: Umer Saleem <usaleem@ixsystems.com>
Closes #15672
This commit is contained in:
Umer Saleem
2023-12-16 03:18:27 +05:00
committed by Brian Behlendorf
parent d8b0b6032b
commit f94a77951d
4 changed files with 94 additions and 1 deletions
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tests/runfiles/linux.run
+2 -1
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@@ -44,7 +44,8 @@ tests = ['block_cloning_copyfilerange', 'block_cloning_copyfilerange_partial',
'block_cloning_copyfilerange_cross_dataset',
'block_cloning_cross_enc_dataset',
'block_cloning_copyfilerange_fallback_same_txg',
'block_cloning_replay', 'block_cloning_replay_encrypted']
'block_cloning_replay', 'block_cloning_replay_encrypted',
'block_cloning_lwb_buffer_overflow']
tags = ['functional', 'block_cloning']
[tests/functional/chattr:Linux]