btrfs used to default the sector size to the page size and didn't support anything else. Since 6.7, it defaults to 4K and using 4K makes the filesystem compatible with all page sizes. So let's make sure we use minimum 4K as well (lower causes failures on systems with a 4K page size) but still allow larger sector sizes if specified by the user. (cherry picked from commit 03c9e88fb7eb8973477c33aa63dc6bcf0cab52c9)
System and Service Manager
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