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Fix available space accounting for special/dedup (#18222)

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Currently, spa_dspace (base to calculate dataset AVAIL) only includes
the normal allocation class capacity, but dd_used_bytes tracks space
allocated across all classes.  Since we don't want to report free
space of other classes as available (we can't promise new allocations
will be able to use it), report only allocated space, similar to how
we report space saved by dedup and block cloning.

Since we need deflated space here, make allocation classes track
deflated allocated space also.  While here, make mc_deferred also
deflated, matching its use contexts.  Also while there, use
atomic_load() to read the allocation class stats.

Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #18190
Closes #18222
This commit is contained in:
Alexander Motin
2026-02-19 13:36:35 -05:00
committed by Tony Hutter
parent 46500a0803
commit 3dcd071b51
6 changed files with 60 additions and 36 deletions
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module/zfs/spa.c
+1 -1
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@@ -7120,6 +7120,7 @@ spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props,
spa->spa_removing_phys.sr_removing_vdev = -1;
spa->spa_removing_phys.sr_prev_indirect_vdev = -1;
spa->spa_indirect_vdevs_loaded = B_TRUE;
spa->spa_deflate = (version >= SPA_VERSION_RAIDZ_DEFLATE);
/*
* Create "The Godfather" zio to hold all async IOs
@@ -7249,7 +7250,6 @@ spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props,
/* Newly created pools with the right version are always deflated. */
if (version >= SPA_VERSION_RAIDZ_DEFLATE) {
spa->spa_deflate = TRUE;
if (zap_add(spa->spa_meta_objset,
DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE,
sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) {