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Implement dynamic gang header sizes

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ZFS gang block headers are currently fixed at 512 bytes. This is
increasingly wasteful in the era of larger disk sector sizes. This PR
allows any size allocation to work as a gang header. It also contains
supporting changes to ZDB to make gang headers easier to work with.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <rob.norris@klarasystems.com>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Closes #17004
This commit is contained in:
Paul Dagnelie
2025-01-23 16:26:09 -08:00
committed by Brian Behlendorf
parent e845be28e7
commit a981cb69e4
18 changed files with 387 additions and 72 deletions
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lib/libzfs/libzfs.abi
+7 -5
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@@ -631,7 +631,7 @@
<elf-symbol name='fletcher_4_superscalar_ops' size='128' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='libzfs_config_ops' size='16' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='sa_protocol_names' size='16' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='spa_feature_table' size='2464' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='spa_feature_table' size='2520' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='zfeature_checks_disable' size='4' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='zfs_deleg_perm_tab' size='528' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='zfs_history_event_names' size='328' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
@@ -6210,7 +6210,8 @@
<enumerator name='SPA_FEATURE_FAST_DEDUP' value='41'/>
<enumerator name='SPA_FEATURE_LONGNAME' value='42'/>
<enumerator name='SPA_FEATURE_LARGE_MICROZAP' value='43'/>
<enumerator name='SPA_FEATURES' value='44'/>
<enumerator name='SPA_FEATURE_DYNAMIC_GANG_HEADER' value='44'/>
<enumerator name='SPA_FEATURES' value='45'/>
</enum-decl>
<typedef-decl name='spa_feature_t' type-id='33ecb627' id='d6618c78'/>
<qualified-type-def type-id='80f4b756' const='yes' id='b99c00c9'/>
@@ -9394,8 +9395,8 @@
</function-decl>
</abi-instr>
<abi-instr address-size='64' path='module/zcommon/zfeature_common.c' language='LANG_C99'>
<array-type-def dimensions='1' type-id='83f29ca2' size-in-bits='19712' id='fd4573e5'>
<subrange length='44' type-id='7359adad' id='cf8ba455'/>
<array-type-def dimensions='1' type-id='83f29ca2' size-in-bits='20160' id='b948da70'>
<subrange length='45' type-id='7359adad' id='cb8ddca0'/>
</array-type-def>
<enum-decl name='zfeature_flags' id='6db816a4'>
<underlying-type type-id='9cac1fee'/>
@@ -9403,6 +9404,7 @@
<enumerator name='ZFEATURE_FLAG_MOS' value='2'/>
<enumerator name='ZFEATURE_FLAG_ACTIVATE_ON_ENABLE' value='4'/>
<enumerator name='ZFEATURE_FLAG_PER_DATASET' value='8'/>
<enumerator name='ZFEATURE_FLAG_NO_UPGRADE' value='16'/>
</enum-decl>
<typedef-decl name='zfeature_flags_t' type-id='6db816a4' id='fc329033'/>
<enum-decl name='zfeature_type' id='c4fa2355'>
@@ -9472,7 +9474,7 @@
<pointer-type-def type-id='611586a1' size-in-bits='64' id='2e243169'/>
<qualified-type-def type-id='eaa32e2f' const='yes' id='83be723c'/>
<pointer-type-def type-id='83be723c' size-in-bits='64' id='7acd98a2'/>
<var-decl name='spa_feature_table' type-id='fd4573e5' mangled-name='spa_feature_table' visibility='default' elf-symbol-id='spa_feature_table'/>
<var-decl name='spa_feature_table' type-id='b948da70' mangled-name='spa_feature_table' visibility='default' elf-symbol-id='spa_feature_table'/>
<var-decl name='zfeature_checks_disable' type-id='c19b74c3' mangled-name='zfeature_checks_disable' visibility='default' elf-symbol-id='zfeature_checks_disable'/>
<function-decl name='opendir' visibility='default' binding='global' size-in-bits='64'>
<parameter type-id='80f4b756'/>