Hello, I used btrfs-convert to switch my FS from Ext4 to Btrfs. As it was a rather large 10 TB filesystem, to save on the conversion time, I used the "-d, disable data checksum" option of btrfs-convert. Turns out now I can't "cp --reflink" any files that were already on the FS prior to conversion. The error message from cp is "failed to clone [...] Invalid argument". I assume this is because of the lack of checksums; the only way to make old files cloneable is to plain copy them to a different place and then delete the originals, but that's what I was trying to avoid in the first place. Also I thought maybe defragmenting will help, but nope, doesn't seem to be the case, even ordering it to recompress data to a different method doesn't fix the problem. (Even if it did, it's still a lot of unnecessary rewriting). Is there really a good reason to stop these files without checksums from being cloneable? It's not like they have the noCoW attribute, so I'd assume any new write to these files would cause a CoW and proper checksums for all new blocks anyways. -- With respect, Roman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
