[Bug 13317] rsync returns success when target filesystem is full

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=13317

--- Comment #22 from Dave Gordon <dg32768 at zoho.eu> ---
(In reply to Ben RUBSON from comment #19)

Just to be totally certain about what ZFS may or may not share between files,
could you try this variant of your testcase:

# zfs destroy $z
# zfs create $z
# zfs set compression=off $z
# zfs set dedup=off $z
# zfs set quota=1G $z

Then with "tmpfs" referring to any non-ZFS filesystem:
# dd if=/dev/random bs=1M count=600 of=$tmpfs/f1
# rsync -a --inplace $tmpfs/f1 $f/f2 ; echo $? ; diff $tmpfs/f1 $f/f2
# dd if=/dev/random bs=1M count=600 of=$tmpfs/f1
# rsync -a --inplace $tmpfs/f1 $f/f3 ; echo $? ; diff $tmpfs/f1 $f/f3

The first rsync should succeed, and the files should be identical.
The second should fail, but if it doesn't then at least it can't be down to ZFS
finding matching datablocks.

.Dave.

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