hammer streaming seems stop working for a while

[Tomohiro Kusumi]

Sorry, I reverted
https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/8a94c3ebc13420d2c3d35360eff649e2308b7d9c


There was one case where mirror write calls this ioctl (not to create a
PFS),
and this sanity check I reverted wasn't appropriate for this particular
case.

(I'm now wondering why no one has complained this for more than 2 months.
I will check some more details of this mirror write case that caused this
issue)

# grep SET_PSEUDOFS sbin/hammer -rI
sbin/hammer/cmd_pfs.c:  if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
sbin/hammer/cmd_pfs.c:  if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) < 0) {
sbin/hammer/cmd_pfs.c:          if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs)
< 0) {
sbin/hammer/cmd_pfs.c:          if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs)
== 0) {
sbin/hammer/cmd_mirror.c:               if (ioctl(fd,
HAMMERIOC_SET_PSEUDOFS, &pfs) != 0) {


2016-02-23 22:11 GMT+09:00 Sepherosa Ziehau <sepherosa at gmail.com>:

> Hi all,
>
> I just noticed today, my hammer back mechanism seems stop working for a
> while.
>
> The output of mount on the backup machine:
> ROOT on / (hammer, local, noatime)
> devfs on /dev (devfs, local)
> /dev/serno/3PT023B3.s1a on /boot (ufs, local, noatime)
> REPOS on /repos (hammer, local, noatime)
> /repos/pfs/@@-1:00007 on /var (null, local)
> /repos/pfs/@@-1:00003 on /tmp (null, local)
> /repos/pfs/@@-1:00006 on /usr (null, local)
> /repos/pfs/@@-1:00001 on /usr/obj (null, local)
> /repos/pfs/@@-1:00005 on /var/crash (null, local)
> /repos/pfs/@@-1:00004 on /var/tmp (null, local)
> /repos/pfs/@@-1:00002 on /usr/src (null, local)
> /repos/pfs/@@0x00000004f3766630:00009 on /backup/sephe/home (null,
> local, read-only)
> /repos/pfs/@@0x00000004f3766630:00008 on /backup/sephe/opt (null,
> local, read-only)
> /repos/pfs/@@-1:00010 on /backup/cold (null, local)
> procfs on /proc (procfs, local)
>
> /backup/sephe/home and /backup/sephe/opt is the slave.
>
> On my laptop, I run:
> hammer mirror-stream /opt root at enigma:/backup/sephe/opt
> hammer mirror-stream /home root at enigma:/backup/sephe/home
>
> And on the backup machine, I got many:
> HAMMER(REPOS) Creating a PFS from non-root PFS is not allowed
> in dmesg
>
> It seems the above line is logged each time, the hammer mirror-stream
> runs on my laptop.
>
> I don't know when it started.
>
> Thanks,
> sephe
>
> --
> Tomorrow Will Never Die
>
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