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Feature #36585

closed

allow nfs-ganesha to export named cephfs filesystems

Added by Jeff Layton over 5 years ago. Updated over 5 years ago.

Status:
Resolved
Priority:
High
Assignee:
Jeff Layton
Category:
-
Target version:
Ceph - v14.0.0
% Done:

0%

Source:
Development
Tags:
Backport:
Reviewed:
Affected Versions:
Component(FS):
Ganesha FSAL, libcephfs
Labels (FS):
multifs
Pull request ID:

Description

Recently, libcephfs grew a new ceph_select_filesystem call that allows the caller to select a particular filesystem to mount prior to issuing the ceph_mount call. Add a new parameter to nfs-ganesha's FSAL_CEPH export config block, that allows the admin to specify the fsname to mount.

This however exposes a second issue. We currently generate filehandles in FSAL_CEPH using a snapid+inode number tuple. With multiple filesystems, this is no longer sufficient to uniquely ID the inode. We need to be able to specify the filesystem too.

What we'll probably use is the fscid that is tracked in the MDS. It's a 32-bit value that should be unique, even if the filesystem is destroyed and recreated. We should be able to mix that in with filehandle to generate enough uniqueness.

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