Commit 6d48755d authored by Josef Bacik's avatar Josef Bacik
Browse files

Btrfs: fix reservation code for mixed block groups 



The global reservation stuff tries to add together DATA and METADATA used in
order to figure out how much to reserve for everything, but this doesn't work
right for mixed block groups.  Instead if we have mixed block groups just set
data used to 0.  Also with mixed block groups we will use bytes_may_use for
keeping track of delalloc bytes, so we need to take that into account in our
reservation calculations.

Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
parent 89a55897

fs/btrfs/extent-tree.c

+6 −2
Original line number Diff line number Diff line
@@ -3213,7 +3213,8 @@ static int reserve_metadata_bytes(struct btrfs_block_rsv *block_rsv, 


	spin_lock(&space_info->lock);

	unused = space_info->bytes_used + space_info->bytes_reserved +

		 space_info->bytes_pinned + space_info->bytes_readonly;

		 space_info->bytes_pinned + space_info->bytes_readonly +

		 space_info->bytes_may_use;



	if (unused < space_info->total_bytes)

		unused = space_info->total_bytes - unused;
@@ -3507,6 +3508,8 @@ static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info) 


	sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);

	spin_lock(&sinfo->lock);

	if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA)

		data_used = 0;

	meta_used = sinfo->bytes_used;

	spin_unlock(&sinfo->lock);
@@ -3534,7 +3537,8 @@ static void update_global_block_rsv(struct btrfs_fs_info *fs_info) 
	block_rsv->size = num_bytes;



	num_bytes = sinfo->bytes_used + sinfo->bytes_pinned +

		    sinfo->bytes_reserved + sinfo->bytes_readonly;

		    sinfo->bytes_reserved + sinfo->bytes_readonly +

		    sinfo->bytes_may_use;



	if (sinfo->total_bytes > num_bytes) {

		num_bytes = sinfo->total_bytes - num_bytes;

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