Merge branch '2020-04-17-master-imports'

- Further cleanups for 'make refcheckdocs'
- Another BTRFS fix.
- Support for automatic decompression of images with booti as well as
  unlz4 command for manual decompression.

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index 66d0e1c7d65..2e4599cf64a 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -78,6 +78,12 @@ u64 btrfs_read_extent_reg(struct btrfs_path *path,
 	if (size > dlen - offset)
 		size = dlen - offset;
 
+	/* sparse extent */
+	if (extent->disk_bytenr == 0) {
+		memset(out, 0, size);
+		return size;
+	}
+
 	physical = btrfs_map_logical_to_physical(extent->disk_bytenr);
 	if (physical == -1ULL)
 		return -1ULL;