Hi. I have a suggestion while I read ext2 code in recent Linux.
mark_files_ro() function in fs/super.c turns off FMODE_WRITE
of every file in a super block for the case of remounting.
However, an inode whose file's mode is FMODE_WRITE may hold
reservations. I think these reservations lost their chance to be discarded
since FMODE_WRITE is off.
So, I think ext2_release_file rather check
Could you check my suggestion is valid or not please?