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btrfs: support all block sizes which is no larger than page size

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Currently if block size < page size, btrfs only supports one single
config, 4K.

This is mostly to reduce the test configurations, as 4K is going to be
the default block size for all architectures.

However all other major filesystems have no artificial limits on the
support block size, and some are already supporting block size > page
sizes.

Since the btrfs subpage block support has been there for a long time,
it's time for us to enable all block size <= page size support.

So here enable all block sizes support as long as it's no larger than
page size for experimental builds.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2025-08-09 14:19:16 +09:30 committed by David Sterba
parent a7f3dfb829
commit 2ccfaf7369
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/fs.c
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@ -78,6 +78,10 @@ bool __attribute_const__ btrfs_supported_blocksize(u32 blocksize)
if (blocksize == PAGE_SIZE || blocksize == SZ_4K || blocksize == BTRFS_MIN_BLOCKSIZE)
return true;
#ifdef CONFIG_BTRFS_EXPERIMENTAL
if (blocksize <= PAGE_SIZE)
return true;
#endif
return false;
}