btrfs: raid56: enable bs > ps support

The support code for bs > ps is complete, enable it and update
assertions.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: adam900710

fs/btrfs/disk-io.c

@@ -3258,12 +3258,6 @@ int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount)
 			   PAGE_SIZE, fs_info->sectorsize);
 		return -EINVAL;
 	}
-	if (fs_info->sectorsize > PAGE_SIZE && btrfs_fs_incompat(fs_info, RAID56)) {
-		btrfs_err(fs_info,
-		"RAID56 is not supported for page size %lu with sectorsize %u",
-			  PAGE_SIZE, fs_info->sectorsize);
-		return -EINVAL;
-	}
 
 	/* This can be called by remount, we need to protect the super block. */
 	spin_lock(&fs_info->super_lock);

fs/btrfs/raid56.c

@@ -1070,8 +1070,12 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_fs_info *fs_info,
 	const unsigned int sector_nsteps = fs_info->sectorsize / step;
 	struct btrfs_raid_bio *rbio;
 
-	/* PAGE_SIZE must also be aligned to sectorsize for subpage support */
-	ASSERT(IS_ALIGNED(PAGE_SIZE, fs_info->sectorsize));
+	/*
+	 * For bs <= ps cases, ps must be aligned to bs.
+	 * For bs > ps cases, bs must be aligned to ps.
+	 */
+	ASSERT(IS_ALIGNED(PAGE_SIZE, fs_info->sectorsize) ||
+	       IS_ALIGNED(fs_info->sectorsize, PAGE_SIZE));
 	/*
 	 * Our current stripe len should be fixed to 64k thus stripe_nsectors
 	 * (at most 16) should be no larger than BITS_PER_LONG.
@@ -3014,9 +3018,6 @@ void raid56_parity_cache_data_folios(struct btrfs_raid_bio *rbio,
 	unsigned int foffset = 0;
 	int ret;
 
-	/* We shouldn't hit RAID56 for bs > ps cases for now. */
-	ASSERT(fs_info->sectorsize <= PAGE_SIZE);
-
 	/*
 	 * If we hit ENOMEM temporarily, but later at
 	 * raid56_parity_submit_scrub_rbio() time it succeeded, we just do