On Mon, 2009-05-11 at 12:45 +0000, Holger Kiehl wrote:
> On Mon, 11 May 2009, Trond Myklebust wrote:
>
> > On Mon, 2009-05-11 at 09:24 +0000, Holger Kiehl wrote:
> >> On Sun, 10 May 2009, Trond Myklebust wrote:
> >>
> >>> On Sat, 2009-05-09 at 19:16 +0000, Holger Kiehl wrote:
> >>>> On Mon, 4 May 2009, Andrew Morton wrote:
> >>>>
> >>>>>
> >>>>> (cc linux-nfs)
> >>>>>
> >>>>> On Sun, 3 May 2009 16:03:38 +0000 (GMT) Holger Kiehl <Holger.Kiehl@xxxxxx> wrote:
> >>>>>
> >>>>>> Hello
> >>>>>>
> >>>>>> With plain kernel 2.6.29.2 I get the following OOPS (several of them) when
> >>>>>> writing lots of small files on the client system:
> >>>>>>
> >>>>>> May 3 18:48:34 obelix kernel: ------------[ cut here ]------------
> >>>>>> May 3 18:48:34 obelix kernel: kernel BUG at fs/nfs/write.c:252!
> >>>>>
> >>>>> I think this is a well-know bug, and fixes should be available in 2.6.29.3?
> >>>>>
> >>>> Thanks for this information. I just tried 2.6.29.3 and it still oopses.
> >>>> Are there any patches I can try?
> >>>
> >>> The attached backports against 2.6.29 are untested, but they are known
> >>> to compile at least. Could you give them a try?
> >>>
> >> Thanks. They do compile but when there is a mmap on the NFS drive the
> >> program gets a SIGBUS:
> >>
> >> unlink("/home/afdbench/afd2/fifodir/AFD_ACTIVE") = 0
> >> close(3) = 0
> >> open("/home/afdbench/afd2/fifodir/AFD_ACTIVE", O_RDWR|O_CREAT|O_TRUNC|O_CLOEXEC, 0600) = 3
> >> lseek(3, 78, SEEK_SET) = 78
> >> write(3, "\377"..., 1) = 1
> >> mmap(NULL, 78, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0x7f8045cdb000
> >> --- SIGBUS (Bus error) @ 0 (0) ---
> >>
> >> This was with 2.6.29.3 plus the patches you send me.
> >>
> >> Holger
> >
> > Oh, duh... You need this little patchlet too.
> >
> Thanks! Now it works. One more problem I have is with splice(). My
> application reports the following error:
>
> splice() error : Invalid argument
>
> When it is called as follows:
>
> if ((bytes_written = splice(fd_pipe[0], NULL, to_fd,
> NULL, bytes_read,
> SPLICE_F_MOVE | SPLICE_F_MORE)) == -1)
>
> Or may I not use splice() over NFS?
The read part is there, but the write part is still missing (just an
oversight - implementing it is pretty trivial). I'm planning on fixing
that for 2.6.31.
Cheers
Trond
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