On 1/4/2012 9:39 μμ, Norbert Scheibner wrote:
On: Sun, 01 Apr 2012 19:22:42 +0200"Klaus A. Kreil" wrote
I am just an interested reader on the btrfs list and so far have never
posted or sent a message to the list, but I do have a dedup bash script
that searches for duplicates underneath a directory (provided as an
argument) and hard links identical files.
It works very well for an ext3 filesystem, but I guess the basics should
be the same for a btrfs filesystem.
Thanks for the nice script, it works fine here!
I just added a du -sh "$1" line at the beginning and end to see how much
space it saves.
Everyone feel free to correct me here, but:
At the moment there is a little problem with the maximum number of hard links in a directory. So I wouldn't use them wherever possible to avoid any thinkable problems in the near future.
Plus to hard link 2 files means, that change one file You change the other one. It's something You either don't want to happen or something, which could be done in better ways. The cp --reflink method on a COW-fs is a much smarter method.
thats true, cp --reflink is much better. Also am I wrong that btrfs has
a limitation on the number of hard links that can only be fixed with a
disk format change?
Plus hard links across subvolumes do match the case of hard links across devices on a traditional fs, which is forbidden.
Plus hard links In my opinion should really be substituted by soft links, because hard links are not transparent at the first sight and can not be copied as it.
So no, I'd rather want the patch to allow cross-subvolume cp --reflink in the kernel and I will wait for that to happen.
Greetings
Norbert
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