btrfs: Fix and enhance merge_extent_mapping() to insert best
fitted extent map.

suse-commit: 0d8e47e6b2b15cfc68175edfc8fce9bb90d6bd8d
btrfs: Fix the wrong condition judgment about subset extent map.

suse-commit: b300cc56183e7b5c10c5dd7dc83ba80eecbd3319
Btrfs: fix crash of btrfs_release_extent_buffer_page.

suse-commit: 4aa15d6572d1d1e74e0c0dd08e5addaec064172c
Btrfs: send, don't delay dir move if there's a new parent inode.

suse-commit: 6e898dac1bf6e980fdee3570a12bbb34e6a5a961
Btrfs: fix invalid leaf slot access in btrfs_lookup_extent().

suse-commit: 96ef5fd30c36a408721267db1c70b4d43e69b103
Btrfs: fix race that makes btrfs_lookup_extent_info miss skinny
extent items.

suse-commit: 46fc953cc8a2dcf895c0f5ce862f8d1a549f9222
Btrfs: fix kfree on list_head in btrfs_lookup_csums_range
error cleanup.

suse-commit: 8ca6bcac59f44951e3122d45462507a125efed04
btrfs: fix lockups from btrfs_clear_path_blocking.

suse-commit: 1e10ffabb7197f7af34a0fd2126f5c8aaf9c60ec