Re: [PATCH v10 10/10] xfs: enable block size larger than page size support

Matthew Wilcox
2024-07-16T15:29:09Z

On Mon, Jul 15, 2024 at 11:44:57AM +0200, Pankaj Raghav (Samsung) wrote:
> +++ b/fs/xfs/xfs_super.c
> @@ -1638,16 +1638,30 @@ xfs_fs_fill_super(
> goto out_free_sb;
> }
>
> - /*
> - * Until this is fixed only page-sized or smaller data blocks work.
> - */
> if (mp->m_sb.sb_blocksize > PAGE_SIZE) {
> - xfs_warn(mp,
> - "File system with blocksize %d bytes. "
> - "Only pagesize (%ld) or less will currently work.",
> + size_t max_folio_size = mapping_max_folio_size_supported();
> +
> + if (!xfs_has_crc(mp)) {
> + xfs_warn(mp,
> +"V4 Filesystem with blocksize %d bytes. Only pagesize (%ld) or less is supported.",
> mp->m_sb.sb_blocksize, PAGE_SIZE);
> - error = -ENOSYS;
> - goto out_free_sb;
> + error = -ENOSYS;
> + goto out_free_sb;
> + }
> +
> + if (mp->m_sb.sb_blocksize > max_folio_size) {
> + xfs_warn(mp,
> +"block size (%u bytes) not supported; maximum folio size supported in "\
> +"the page cache is (%ld bytes). Check MAX_PAGECACHE_ORDER (%d)",
> + mp->m_sb.sb_blocksize, max_folio_size,
> + MAX_PAGECACHE_ORDER);

Again, too much message. Way too much. We shouldn't even allow block
devices to be created if their block size is larger than the max supported
by the page cache.