btrfs: add extent allocator hook to decide to allocate chunk or not

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Introduce a new hook for an extent allocator policy. With the new
hook, a policy can decide to allocate a new block group or not. If
not, it will return -ENOSPC, so btrfs_reserve_extent() will cut the
allocation size in half and retry the allocation if min_alloc_size is
large enough.

The hook has a place holder and will be replaced with the real
implementation in the next patch.

CC: stable@vger.kernel.org # 5.16
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Naohiro Aota 2021-12-08 00:35:48 +09:00 • committed by David Sterba

parent 1ada69f61c

commit 50475cd577

1 changed files with 17 additions and 0 deletions

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17

fs/btrfs/extent-tree.c

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