Commit 39e264a4 authored by Nikolay Borisov's avatar Nikolay Borisov Committed by David Sterba
Browse files

btrfs: Populate ->orig_block_len during read_one_chunk 



Chunks read from disk currently don't get their ->orig_block_len member
set, in contrast when a new chunk is allocated, the respective
extent_map's ->orig_block_len is assigned the size of the stripe of this
chunk.

Let's apply the same strategy for chunks which are read from
disk, not only does this codify the invariant that ->orig_block_len
always contains the size of the stripe for a chunk (when the em belongs
to the mapping tree). But it's also a preparatory patch for further work
around tracking chunk allocation in an extent tree rather than
pinned/pending lists.

Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 41e7acd3

fs/btrfs/volumes.c

+22 −19
Original line number Original line Diff line number Diff line
@@ -6710,6 +6710,26 @@ static void btrfs_report_missing_device(struct btrfs_fs_info *fs_info, 
			      devid, uuid);

			      devid, uuid);

}

}





static u64 calc_stripe_length(u64 type, u64 chunk_len, int num_stripes)

{

	int index = btrfs_bg_flags_to_raid_index(type);

	int ncopies = btrfs_raid_array[index].ncopies;

	int data_stripes;



	switch (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {

	case BTRFS_BLOCK_GROUP_RAID5:

		data_stripes = num_stripes - 1;

		break;

	case BTRFS_BLOCK_GROUP_RAID6:

		data_stripes = num_stripes - 2;

		break;

	default:

		data_stripes = num_stripes / ncopies;

		break;

	}

	return div_u64(chunk_len, data_stripes);

}



static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,

static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,

			  struct extent_buffer *leaf,

			  struct extent_buffer *leaf,

			  struct btrfs_chunk *chunk)

			  struct btrfs_chunk *chunk)
@@ -6775,6 +6795,8 @@ static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key, 
	map->type = btrfs_chunk_type(leaf, chunk);

	map->type = btrfs_chunk_type(leaf, chunk);

	map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);

	map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);

	map->verified_stripes = 0;

	map->verified_stripes = 0;

	em->orig_block_len = calc_stripe_length(map->type, em->len,

						map->num_stripes);

	for (i = 0; i < num_stripes; i++) {

	for (i = 0; i < num_stripes; i++) {

		map->stripes[i].physical =

		map->stripes[i].physical =

			btrfs_stripe_offset_nr(leaf, chunk, i);

			btrfs_stripe_offset_nr(leaf, chunk, i);
@@ -7632,25 +7654,6 @@ int btrfs_bg_type_to_factor(u64 flags) 
}

}









static u64 calc_stripe_length(u64 type, u64 chunk_len, int num_stripes)

{

	int index = btrfs_bg_flags_to_raid_index(type);

	int ncopies = btrfs_raid_array[index].ncopies;

	int data_stripes;



	switch (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {

	case BTRFS_BLOCK_GROUP_RAID5:

		data_stripes = num_stripes - 1;

		break;

	case BTRFS_BLOCK_GROUP_RAID6:

		data_stripes = num_stripes - 2;

		break;

	default:

		data_stripes = num_stripes / ncopies;

		break;

	}

	return div_u64(chunk_len, data_stripes);

}





static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,

static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,

				 u64 chunk_offset, u64 devid,

				 u64 chunk_offset, u64 devid,

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