Re: [CHECKER] Do ext2, jfs and reiserfs respect mount -o sync/dirsync option?

Matt Mackall
2005-03-04T07:17:51Z

On Thu, Mar 03, 2005 at 10:33:40PM -0800, Junfeng Yang wrote:
>
> Hi,
>
> FiSC (our file system checker) emits several warnings on ext2, jfs and
> reiserfs, complaining that diretories or files are lost while FiSC
> believes they should already be persistent on disk. (ext3 behaves
> correctly.)
>
> All warnings boil down to a single cause: when these file systems are
> mounted -o sync or dirsync, dirty blocks are still written out
> asynchronously. It appears to me that these mount options don't have any
> effect on these file systems. Is this the intended behavior?

I don't believe so. The sync option should definitionally make calls
to fsync for integrity redundant. This probably got broken ages ago
for ext2 in one of the many buffer/page cache refactorings.

--
Mathematics is the supreme nostalgia of our time.