Re: [PATCH] fix problems related to journaling in Reiserfs

[Hifumi Hisashi <hifumi.hisashi@lab.ntt.co.jp>]

michael chang wrote:

>Surely we don't want this.  Look at the papers on Namesys's websites,
>about the atomicaty and the banking example.  But that's just my
>personal opinion.  Besides, I believe it's more likely that usually
>the power gets lost than the SCSI or IDE cable gets disconnected,
>AFAIK...
>  
>
    A write()  syscall with the O_SYNC flag must ensure that not only 
file data block
but also journal (meta-data update) are written to a disk when this 
syscall end.
   But, current implementation of Reiserfs does not do that. If a system 
crashes,
a filesystem recovers from the journal transaction log. But, Reiserfs 
may not
recover in some cases.
   I checked other filesystems like ext3, jfs, xfs. Those filesystem 
write transactions
to a disk everytime  write()  with the O_SYNC is performed. In those 
filesystem,
I have no trouble mentioned above.
  
  I should say, the Reiserfs would be "un"reliable filesystem..........