Reviewed by: Serapheim Dimitropoulos <serapheim.dimi...@delphix.com>
Reviewed by: George Wilson <george.wil...@delphix.com>

Updates to indirect blocks of spacemaps can contribute significantly to write 
inflation.
Therefore we want to reduce the indirect block size of spacemaps from 128K to 
16K.

Upstream bug: DLPX-56647
You can view, comment on, or merge this pull request online at:

  https://github.com/openzfs/openzfs/pull/609

-- Commit Summary --

  * 9442 decrease indirect block size of spacemaps

-- File Changes --

    M usr/src/uts/common/fs/zfs/dmu_object.c (14)
    M usr/src/uts/common/fs/zfs/space_map.c (15)
    M usr/src/uts/common/fs/zfs/sys/dmu.h (3)

-- Patch Links --

https://github.com/openzfs/openzfs/pull/609.patch
https://github.com/openzfs/openzfs/pull/609.diff

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