[issue1642] hammer v2 mirror-copy + pfs-upgrade + pfs-downgrade makes data unavail

Thomas Nikolajsen (via DragonFly issue tracker) sinknull at leaf.dragonflybsd.org
Mon Jan 4 23:51:01 PST 2010

New submission from Thomas Nikolajsen <thomas.nikolajsen at mail.dk>:

I have problem where data in a PFS can't be accessed; I did:
(tried to get PFS on laptop, for 26c3)
src$ hammer mirror-copy PFS dst:PFS
src$ hammer pfs-downgrade PFS
dst$ hammer pfs-upgrade PFS

After this PFS was empty on dst; then did:
dst$ hammer pfs-downgrade PFS
src$ hammer pfs-upgrade PFS

Now PFS on src can't be accessed, see below.

This is HAMMER version 2 file systems on both src and dst;
on src it was originally version 1; have been upgraded some time ago.

I also mirror-copy'ed another PFS (no pfs-downgrade/pfs-upgrade),
it is empty on dst, and accessible as usual on src.

Both mirror-copy operations seemed to run with success.

commit ec61b2892719413e2fd52a677fc9a1d05d09d59a
(DragonFly_RELEASE_2_4 HAMMER - Fix root inode creation for slave)
isn't included on dst (build the day before it was committed);
I'm not sure if it is included on src (info is in git repo I can't access).

Any chance to get my data back?

I haven't updated src HAMMER file system since problem.
These data aren't critical (some local changes); do have checkout.

src$ ls -l /hammer/.pfs/home.dragonfly.git
lrwxr-xr-x  1 root  wheel  10 May 30  2009 /hammer/.pfs/home.dragonfly.git -> 
src$ ls -l /hammer/.pfs/home.dragonfly.git/
ls: /hammer/.pfs/home.dragonfly.git/: No such file or directory
src$ hammer version /hammer/.pfs
min=1 wip=3 max=2 current=2 description="2.3 - New directory entry layout"
available versions:
    1   NORM    2.0 - First HAMMER release
    2   NORM    2.3 - New directory entry layout
src$ hammer pfs-status /hammer/.pfs/home.dragonfly.git
/hammer/.pfs/home.dragonfly.git PFS #11 {
    operating as a MASTER
    snapshots dir for master defaults to <fs>/snapshots
src$ uname -a
DragonFly ask 2.4.1-RELEASE DragonFly v2.4.1.17.g372c9-RELEASE #4: Mon Oct 12 
00:35:07 CEST 2009     root at boy:/usr/obj/usr/src/sys/STANDARD  i386

dst$ DragonFly bog 2.4.1-RELEASE DragonFly 2.4.1-RELEASE #3: Thu Oct  1 
00:44:55 CEST 2009     root at boy:/usr/obj/usr/src/sys/STANDARD  i386

messages: 8007
nosy: thomas.nikolajsen
priority: bug
status: unread
title: hammer v2 mirror-copy + pfs-upgrade + pfs-downgrade makes data unavail

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