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Commit dc95f7bf authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

Btrfs: fix truncate_space_check 



truncate_space_check is using btrfs_csum_bytes_to_leaves() but forgetting to
multiply by nodesize so we get an actual byte count.  We need a tracepoint here
so that we have the matching reserve for the release that will come later.  Also
add a comment to make clear what the intent of truncate_space_check is.

Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent fb4b10e5

fs/btrfs/inode.c

+10 −1
Original line number Diff line number Diff line
@@ -4211,11 +4211,20 @@ static int truncate_space_check(struct btrfs_trans_handle *trans, 
{

	int ret;



	/*

	 * This is only used to apply pressure to the enospc system, we don't

	 * intend to use this reservation at all.

	 */

	bytes_deleted = btrfs_csum_bytes_to_leaves(root, bytes_deleted);

	bytes_deleted *= root->nodesize;

	ret = btrfs_block_rsv_add(root, &root->fs_info->trans_block_rsv,

				  bytes_deleted, BTRFS_RESERVE_NO_FLUSH);

	if (!ret)

	if (!ret) {

		trace_btrfs_space_reservation(root->fs_info, "transaction",

					      trans->transid,

					      bytes_deleted, 1);

		trans->bytes_reserved += bytes_deleted;

	}

	return ret;



}