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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.h
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@@ -1084,6 +1084,7 @@ extern pool_state_t spa_state(spa_t *spa);
extern spa_load_state_t spa_load_state(spa_t *spa);
extern uint64_t spa_freeze_txg(spa_t *spa);
extern uint64_t spa_get_worst_case_asize(spa_t *spa, uint64_t lsize);
extern void spa_get_min_alloc_range(spa_t *spa, uint64_t *min, uint64_t *max);
extern uint64_t spa_get_dspace(spa_t *spa);
extern uint64_t spa_get_checkpoint_space(spa_t *spa);
extern uint64_t spa_get_slop_space(spa_t *spa);