The Btrfs inode-number epic (part 1: the problem)

Re:The Btrfs inode-number epic (part 1: the problem) by yjftsjthsd-h on Tuesday August 24, 2021 @03:02PM (#28293353)

So how does ZFS handle the same problem? (I would guess that it just goes through with making each dataset a full filesystem and just deals with the overhead for NFS, but I don't know that)

[ Parent | on HN ]

Re:The Btrfs inode-number epic (part 1: the problem) by Deeg9rie9usi on Tuesday August 24, 2021 @03:33PM (#28293756)

Since ZFS does not really have the concept sub-volumes like btrfs it does not suffer from it.

[ Parent | on HN ]

Re:The Btrfs inode-number epic (part 1: the problem) by magicalhippo on Tuesday August 24, 2021 @03:43PM (#28293910)

I'm no expert so maybe I'm missing something.

To me it seems that ZFS snapshots represents a similar challenge[1] given that the snapshots can be accessed through the .zfs directory, and that ZFS also plays tricks[2] with the inodes.

[1]: https://docs.oracle.com/cd/E19253-01/819-5461/gbiqe/index.ht...

[2]: http://mikeboers.com/blog/2019/02/21/zfs-inode-generations

[ Parent | on HN ]

Re:The Btrfs inode-number epic (part 1: the problem) by rincebrain on Tuesday August 24, 2021 @04:30PM (#28294582)

They're always explicit mounts on ZFS. (Even the .zfs directory triggers mounting on access of things under snapshot/.)

[ Parent | on HN ]

Re:The Btrfs inode-number epic (part 1: the problem) by AndrewDavis on Tuesday August 24, 2021 @08:58PM (#28296914)

As a tangent, what's interesting is whether `mount` shows the mountpoint.

If you cd into a snapshot on FreeBSD it does not get listed in calls to `mount` but does on ZoL.

edit: i have not tested this since FreeBSD rebased on ZoL

[ Parent | on HN ]

Re:The Btrfs inode-number epic (part 1: the problem) by speed_spread on Tuesday August 24, 2021 @03:58PM (#28294116)

BTRFS has volumes/subvolumes while ZFS has pools/filesystems. I suspect they have considerably different implementations but the userspace implications are similar.

[ Parent | on HN ]

Re:The Btrfs inode-number epic (part 1: the problem) by yjftsjthsd-h on Tuesday August 24, 2021 @04:49PM (#28294826)

How is a BTRFS sub volume different from a ZFS child dataset/filesystem?

[ Parent | on HN ]