Pick commit 2729cfdcfa ("ext4: use ext4_journal_start/stop for fast commit transactions")

Hello,

recently I've debugged a deadlock issue in ext4 fast commit feature in our openSUSE Leap kernel. Checking with upstream I've found out the issue was accidentally fixed by commit 2729cfdcfa1c ("ext4: use ext4_journal_start/stop for fast commit transactions"). Can you please pick up this commit into the stable tree? The problem has been there since fast commit began to exist (in 5.10-rc1) so 5.10 and 5.15 stable trees need the fix. Thanks!

Honza