Extern or forward variable declaration at fs/btrfs/extent_io.h, line 254 References: fs/btrfs/block-group.c, line 1114 fs/btrfs/block-group.c, line 1133 fs/btrfs/block-group.c, line 1457 fs/btrfs/block-group.c, line 1641 fs/btrfs/btrfs_inode.h, line 53 fs/btrfs/compression.c, line 441 fs/btrfs/compression.c, line 550 fs/btrfs/ctree.h, line 560 fs/btrfs/dev-replace.c, line 727 fs/btrfs/disk-io.c, line 209 fs/btrfs/extent_io.c, line 2381 fs/btrfs/extent_io.c, line 4406 fs/btrfs/extent_io.h, line 254 fs/btrfs/extent_map.c, line 36 fs/btrfs/extent_map.c, line 231 fs/btrfs/extent_map.c, line 281 fs/btrfs/extent_map.c, line 320 fs/btrfs/extent_map.c, line 327 fs/btrfs/extent_map.c, line 382 fs/btrfs/extent_map.c, line 403 fs/btrfs/extent_map.c, line 442 fs/btrfs/extent_map.c, line 459 fs/btrfs/extent_map.c, line 473 fs/btrfs/extent_map.c, line 484 fs/btrfs/extent_map.c, line 525 fs/btrfs/extent_map.c, line 582 fs/btrfs/file.c, line 593 fs/btrfs/file.c, line 2286 fs/btrfs/free-space-cache.c, line 3363 fs/btrfs/inode.c, line 922 fs/btrfs/inode.c, line 5099 fs/btrfs/inode.c, line 5318 fs/btrfs/inode.c, line 6928 fs/btrfs/inode.c, line 7568 fs/btrfs/inode.c, line 10380 fs/btrfs/ioctl.c, line 1016 fs/btrfs/ioctl.c, line 1107 fs/btrfs/relocation.c, line 3199 fs/btrfs/scrub.c, line 3426 fs/btrfs/tests/extent-map-tests.c, line 10 fs/btrfs/tests/extent-map-tests.c, line 51 fs/btrfs/tests/extent-map-tests.c, line 141 fs/btrfs/tests/extent-map-tests.c, line 223 fs/btrfs/tests/extent-map-tests.c, line 306 fs/btrfs/tests/extent-map-tests.c, line 322 fs/btrfs/tests/extent-map-tests.c, line 428 fs/btrfs/tests/extent-map-tests.c, line 443 fs/btrfs/tree-log.c, line 4502 fs/btrfs/tree-log.c, line 5117 fs/btrfs/volumes.c, line 1819 fs/btrfs/volumes.c, line 2941 fs/btrfs/volumes.c, line 4912 fs/btrfs/volumes.c, line 5365 fs/btrfs/volumes.c, line 6720 fs/btrfs/volumes.c, line 7136 fs/btrfs/volumes.c, line 7655 fs/btrfs/volumes.c, line 7744