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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
parent d33d0cac5a
commit 954fe5e1be
8 changed files with 52 additions and 14 deletions
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module/zfs/spa_misc.c
+15
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@@ -806,6 +806,7 @@ spa_add(const char *name, nvlist_t *config, const char *altroot)
spa->spa_min_ashift = INT_MAX;
spa->spa_max_ashift = 0;
spa->spa_min_alloc = INT_MAX;
spa->spa_max_alloc = 0;
spa->spa_gcd_alloc = INT_MAX;
/* Reset cached value */
@@ -1864,6 +1865,19 @@ spa_get_worst_case_asize(spa_t *spa, uint64_t lsize)
return (MAX(lsize, 1 << spa->spa_max_ashift) * spa_asize_inflation);
}
/*
* Return the range of minimum allocation sizes 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.
* This is mainly for dRAID pools which always pad to a full stripe width.
*/
void
spa_get_min_alloc_range(spa_t *spa, uint64_t *min_alloc, uint64_t *max_alloc)
{
*min_alloc = spa->spa_min_alloc;
*max_alloc = spa->spa_max_alloc;
}
/*
* Return the amount of slop space in bytes. It is typically 1/32 of the pool
* (3.2%), minus the embedded log space. On very small pools, it may be
@@ -3085,6 +3099,7 @@ EXPORT_SYMBOL(spa_version);
EXPORT_SYMBOL(spa_state);
EXPORT_SYMBOL(spa_load_state);
EXPORT_SYMBOL(spa_freeze_txg);
EXPORT_SYMBOL(spa_get_min_alloc_range); /* for Lustre */
EXPORT_SYMBOL(spa_get_dspace);
EXPORT_SYMBOL(spa_update_dspace);
EXPORT_SYMBOL(spa_deflate);