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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 Tony Hutter
parent 660077ffee
commit 2b0502c578
8 changed files with 52 additions and 14 deletions
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include/sys/fs/zfs.h
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@@ -740,6 +740,8 @@ typedef struct zpool_load_policy {
#define ZPOOL_CONFIG_METASLAB_SHIFT "metaslab_shift"
#define ZPOOL_CONFIG_ASHIFT "ashift"
#define ZPOOL_CONFIG_ASIZE "asize"
#define ZPOOL_CONFIG_MIN_ALLOC "min_alloc"
#define ZPOOL_CONFIG_MAX_ALLOC "max_alloc"
#define ZPOOL_CONFIG_DTL "DTL"
#define ZPOOL_CONFIG_SCAN_STATS "scan_stats" /* not stored on disk */
#define ZPOOL_CONFIG_REMOVAL_STATS "removal_stats" /* not stored on disk */