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xfs: enable in-core block reservation for rt metadata [v6.2 03/14]

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In preparation for adding reverse mapping and refcounting to the
 realtime device, enhance the metadir code to reserve free space for
 btree shape changes as delayed allocation blocks.
 
 This enables us to pre-allocate space for the rmap and refcount btrees
 in the same manner as we do for the data device counterparts, which is
 how we avoid ENOSPC failures when space is low but we've already
 committed to a COW operation.
 
 This has been running on the djcloud for months with no problems.  Enjoy!
 
 Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
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Merge tag 'reserve-rt-metadata-space_2024-12-23' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into for-next

xfs: enable in-core block reservation for rt metadata [v6.2 03/14]

In preparation for adding reverse mapping and refcounting to the
realtime device, enhance the metadir code to reserve free space for
btree shape changes as delayed allocation blocks.

This enables us to pre-allocate space for the rmap and refcount btrees
in the same manner as we do for the data device counterparts, which is
how we avoid ENOSPC failures when space is low but we've already
committed to a COW operation.

This has been running on the djcloud for months with no problems.  Enjoy!

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
This commit is contained in:
Carlos Maiolino 2025-01-13 14:54:33 +01:00
commit 8a092f440e
23 changed files with 367 additions and 19 deletions
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