btrfs: zoned: revive max_zone_append_bytes

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This patch is basically a revert of commit 5a80d1c6a2 ("btrfs: zoned:
remove max_zone_append_size logic"), but without unnecessary ASSERT and
check. The max_zone_append_size will be used as a hint to estimate the
number of extents to cover delalloc/writeback region in the later commits.

The size of a ZONE APPEND bio is also limited by queue_max_segments(), so
this commit considers it to calculate max_zone_append_size. Technically, a
bio can be larger than queue_max_segments() * PAGE_SIZE if the pages are
contiguous. But, it is safe to consider "queue_max_segments() * PAGE_SIZE"
as an upper limit of an extent size to calculate the number of extents
needed to write data.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

Naohiro Aota 2022-07-09 08:18:39 +09:00 • committed by David Sterba

parent 65ea1b6648

commit c2ae7b772e

3 changed files with 20 additions and 0 deletions

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2

fs/btrfs/ctree.h

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17

fs/btrfs/zoned.c

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1

fs/btrfs/zoned.h

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