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Add interface to interface spa_get_worst_case_min_alloc() function

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Provide an interface to retrieve the lowest and highest minimum
allocation size for the normal allocation class.  This can be used
by external consumers of the DMU to estimate potential wasted
capacity when setting the recordsize for an object.

The new "min_alloc" and "max_alloc" keys are added to the pool
configuration and used by default_volblocksize() to warn when
an ineffecient block size is requested.  For older kmods which
don't yet include the new keys fallback to the previous logic.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17758
This commit is contained in:
Brian Behlendorf
2025-09-25 09:35:35 -07:00
committed by GitHub
parent 0e1a53a8c0
commit c722bf8812
8 changed files with 52 additions and 14 deletions
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include/sys/spa_impl.h
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@@ -265,6 +265,7 @@ struct spa {
uint64_t spa_min_ashift; /* of vdevs in normal class */
uint64_t spa_max_ashift; /* of vdevs in normal class */
uint64_t spa_min_alloc; /* of vdevs in normal class */
uint64_t spa_max_alloc; /* of vdevs in normal class */
uint64_t spa_gcd_alloc; /* of vdevs in normal class */
uint64_t spa_config_guid; /* config pool guid */
uint64_t spa_load_guid; /* spa_load initialized guid */