[DragonFlyBSD - Bug #2863] HAMMER synch tid is zero

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #2863 has been updated by tkusumi.


haven't look at details, but see if your patch works and your patch is correct on mount update case,
when hmp (as well as flusher which is a part of *hmp) already exists on mount(2).

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Bug #2863: HAMMER synch tid is zero
http://bugs.dragonflybsd.org/issues/2863#change-12775

* Author: shamaz
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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Hello. This appears on DragonFlyBSD 4.2 (and maybe newer) if you try the
following with HAMMER filesystem:

1) Create a new vnode device.
# dd if=/dev/zero of=test.img bs=1m count=15000
# vnconfig -c vn test.img
# disklabel64  -w -r vn4s0 auto
# disklabel64 -e vn4s0
Add a line like "a:      *      0     HAMMER"

2) Create a HAMMER filesystem:
newfs_hammer -f -L TEST /dev/vn4s0a

3) Mount it:
mount /dev/vn4s0a /mnt

4) Try to sync it:
hammer synctid /mnt

You will see zero sync tid (0x0000000000000000). If you try to set some
debug-related sysctls, it will get you no info at all when syncing. Also
hammer pfs-status /mnt will show that sync-end-tid does not increment in
time as it should. I am not sure if it happens with any non-root hammer FS,
or just with those based on vn pseudo disks.

---Files--------------------------------
flusher_tid.patch (492 Bytes)


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