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btrfs: make nodesize >= PAGE_SIZE case to reuse the non-subpage routine

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The reason why we only support 64K page size for subpage is, for 64K
page size we can ensure no matter what the nodesize is, we can fit it
into one page.

When other page size come, especially like 16K, the limitation is a bit
limiting.

To remove such limitation, we allow nodesize >= PAGE_SIZE case to go the
non-subpage routine.  By this, we can allow 4K sectorsize on 16K page
size.

Although this introduces another smaller limitation, the metadata can
not cross page boundary, which is already met by most recent mkfs.

Another small improvement is, we can avoid the overhead for metadata if
nodesize >= PAGE_SIZE.
For 4K sector size and 64K page size/node size, or 4K sector size and
16K page size/node size, we don't need to allocate extra memory for the
metadata pages.

Please note that, this patch will not yet enable other page size support
yet.

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 2022-01-13 13:22:09 +08:00 • committed by David Sterba
parent e959d3c1df
commit fbca46eb46
5 changed files with 110 additions and 53 deletions
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4
fs/btrfs/disk-io.c
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@ -519,7 +519,7 @@ static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct bio_vec *bvec
u64 found_start;
struct extent_buffer *eb;
if (fs_info->sectorsize < PAGE_SIZE)
if (fs_info->nodesize < PAGE_SIZE)
return csum_dirty_subpage_buffers(fs_info, bvec);
eb = (struct extent_buffer *)page->private;
@ -704,7 +704,7 @@ int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
ASSERT(page->private);
if (btrfs_sb(page->mapping->host->i_sb)->sectorsize < PAGE_SIZE)
if (btrfs_sb(page->mapping->host->i_sb)->nodesize < PAGE_SIZE)
return validate_subpage_buffer(page, start, end, mirror);
eb = (struct extent_buffer *)page->private;