Re: Number of hard links limit

[Anthony Roberts <btrfs-devel@arbitraryconstant.com>]

On Mon, 2 Aug 2010 15:05:56 +0200, Xavier Nicollet <nicollet@jeru.org>
wrote:
> Le 02 ao=C3=BBt 2010 =C3=A0 14:40, Sami Liedes a =C3=A9crit:
>> [BTRFS supports only 256 hard-links per directory ...] but if it
>> indeed needs a disk format change, I think this should be considered
>> before the format is set in stone. I won't personally lose my sleep =
if
>> this is not fixed - I can use other filesystems for backuppc and oth=
er
>> similar systems,=20
>=20
> Wouldn't it be even better to actually patch BackupPC to handle btrfs
> snapshots and COW (bcp) ?

That's not the only application impacted by this.

Also, I think it's unrealistic to expect everyone else to code to
BTRFS-specific ioctls when there's other filesystems and other platform=
s to
worry about. It would also be nice if we could tar/rsync/whatever betwe=
en
BTRFS and something else like ext3 or some other OS entirely, without
archiving tools either blowing up or requiring application-specific
knowledge of how to convert dedups to hard links and back.

Also, I believe it's not strictly 256 links, it's dependent on the leng=
th
of the names.

I recall Chris posting something about being able to fix this without a
format change, though it wasn't a priority yet.

-Anthony
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