`mksnap_ffs` could not make snapshot on `union`-mounted FS (but created snapshot entry).

[Lev Serebryakov]

 I have UFS2+SUJ which is mounted like this:

/dev/ufs/unifi on /usr/local/unifi (ufs, local, union)

 When I try to create snapshot (for live backup with `dump(8)`) I get:

root at gateway:~ # ls -la /usr/local/unifi/.snap
total 5
drwxrwx---  2 root  operator   512 Oct  1 14:17 .
drwxr-xr-x  7 root  wheel     4096 May 28 00:20 ..
root at gateway:~ # mksnap_ffs /usr/local/unifi/.snap/dump_snapshot
mksnap_ffs: Cannot create snapshot /usr/local/unifi/.snap/dump_snapshot:
No such file or directory
root at gateway:~ # ls -la /usr/local/unifi/.snap
total 5
drwxrwx---  2 root  operator   512 Oct  1 14:17 .
drwxr-xr-x  7 root  wheel     4096 May 28 00:20 ..
-r--------  1 root  operator     0 Oct  1 14:17 dump_snapshot
root at gateway:~ # rm /usr/local/unifi/.snap/dump_snapshot
root at gateway:~ # ls -la /usr/local/unifi/.snap
total 5
drwxrwx---  2 root  operator   512 Oct  1 14:20 .
drwxr-xr-x  7 root  wheel     4096 May 28 00:20 ..
root at gateway:~ #

 So, snapshot was created, but then failed.
 It is rather old 13-CURRENT:

root at gateway:~ # uname -a
FreeBSD gateway.home.serebryakov.spb.ru 13.0-CURRENT FreeBSD
13.0-CURRENT r348252M J3160  amd64
root at gateway:~ #

-- 
// Lev Serebryakov

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