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Use a helper function to clarify gang block size

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For gang blocks, `DVA_GET_ASIZE()` is the total space allocated for the
gang DVA including its children BP's.  The space allocated at each DVA's
vdev/offset is `vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE)`.

This commit makes this relationship more clear by using a helper
function, `vdev_gang_header_asize()`, for the space allocated at the
gang block's vdev/offset.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #11744
This commit is contained in:
Matthew Ahrens
2021-03-26 11:19:35 -07:00
committed by GitHub
parent b85f47efd0
commit 2b56a63457
4 changed files with 30 additions and 11 deletions
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module/zfs/metaslab.c
+4 -4
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@@ -5544,7 +5544,7 @@ metaslab_unalloc_dva(spa_t *spa, const dva_t *dva, uint64_t txg)
ASSERT3P(vd->vdev_indirect_mapping, ==, NULL);
if (DVA_GET_GANG(dva))
size = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
size = vdev_gang_header_asize(vd);
msp = vd->vdev_ms[offset >> vd->vdev_ms_shift];
@@ -5579,7 +5579,7 @@ metaslab_free_dva(spa_t *spa, const dva_t *dva, boolean_t checkpoint)
ASSERT3U(spa_config_held(spa, SCL_ALL, RW_READER), !=, 0);
if (DVA_GET_GANG(dva)) {
size = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
size = vdev_gang_header_asize(vd);
}
metaslab_free_impl(vd, offset, size, checkpoint);
@@ -5768,7 +5768,7 @@ metaslab_claim_dva(spa_t *spa, const dva_t *dva, uint64_t txg)
ASSERT(DVA_IS_VALID(dva));
if (DVA_GET_GANG(dva))
size = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
size = vdev_gang_header_asize(vd);
return (metaslab_claim_impl(vd, offset, size, txg));
}
@@ -6034,7 +6034,7 @@ metaslab_check_free(spa_t *spa, const blkptr_t *bp)
uint64_t size = DVA_GET_ASIZE(&bp->blk_dva[i]);
if (DVA_GET_GANG(&bp->blk_dva[i]))
size = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
size = vdev_gang_header_asize(vd);
ASSERT3P(vd, !=, NULL);