[PATCH 4.4 29/45] ext4: fix inode checksum calculation problem if i_extra_size is small

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Daeho Jeong commit 05ac5aa18abd7db341e54df4ae2b4c98ea0e43b7 upstream. We've fixed the race condition problem in calculating ext4 checksum value in commit b47820edd163

[PATCH 4.4 29/45] ext4: fix inode checksum calculation problem if i_extra_size is small

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Daeho Jeong commit 05ac5aa18abd7db341e54df4ae2b4c98ea0e43b7 upstream. We've fixed the race condition problem in calculating ext4 checksum value in commit b47820edd163 ("ext4: avoid modifying