RE: [PATCH] exfat: do not clear VolumeDirty in writeback

[Kohada.Tetsuhiro@xxxxxxxxxxxxxxxxxxxxxxxxxxx]

Hi, Yuezhang,Mo

> > >(PS: The original logic is to clear VolumeDirty after BitMap, FAT and directory
> > entries are updated.)
> >
> > However, the writing order was not guaranteed.
> > More synchronous writes are needed to guarantee the write order.
> 
> If "dirsync" or "sync" is enabled, BitMap, FAT and directory entries are guaranteed to be written in order.
> This is the reason to keep clearing VolumeDirty.

SB_DIRSYNC requests synchronization of the inode of the current file/dir.
The exfat implementation updates and syncs the dir-entries of the current file/dir.
If only SB_DIRSYNC is set and SB_SYNC is not set, it cannot be guaranteed that FAT/mirrorFAT is synchronized.

BR
T .Kohada