Btrfs: use fastpath in extent state ops as much as possible
Btrfs: use fastpath in extent state ops as much as possible

Fully utilize our extent state's new helper functions to use
fastpath as much as possible.

Signed-off-by: Liu Bo <00b627b8656913e4df3ede997ad1311ebf4b82a4@cn.fujitsu.com>
Reviewed-by: Josef Bacik <78b342861d821967b29f951b7366f5a0267e0c38@redhat.com>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas