btrfs: Remove false alert when fiemap range is smaller than on-disk extent

}

/*

 * Sanity check for fiemap cache

 * Emit last fiemap cache

 *

 * All fiemap cache should be submitted by emit_fiemap_extent()

 * Iteration should be terminated either by last fiemap extent or

 * fieinfo->fi_extents_max.

 * So no cached fiemap should exist.

 * The last fiemap cache may still be cached in the following case:

 * 0		      4k		    8k

 * |<- Fiemap range ->|

 * |<------------  First extent ----------->|

 *

 * In this case, the first extent range will be cached but not emitted.

 * So we must emit it before ending extent_fiemap().

 */

static int check_fiemap_cache(struct btrfs_fs_info *fs_info,

static int emit_last_fiemap_cache(struct btrfs_fs_info *fs_info,

				  struct fiemap_extent_info *fieinfo,

				  struct fiemap_cache *cache)

{

	if (!cache->cached)

		return 0;

	/* Small and recoverbale problem, only to info developer */

#ifdef CONFIG_BTRFS_DEBUG

	WARN_ON(1);

#endif

	btrfs_warn(fs_info,

		   "unhandled fiemap cache detected: offset=%llu phys=%llu len=%llu flags=0x%x",

		   cache->offset, cache->phys, cache->len, cache->flags);

	ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys,

				      cache->len, cache->flags);

	cache->cached = false;

	}

out_free:

	if (!ret)

		ret = check_fiemap_cache(root->fs_info, fieinfo, &cache);

		ret = emit_last_fiemap_cache(root->fs_info, fieinfo, &cache);

	free_extent_map(em);

out:

	btrfs_free_path(path);