> On Wed, Jan 13, 2021 at 03:16:52PM +0000, Trond Myklebust wrote: > > How would that work then? Would you just look at the project ID of the > > directory identified by the filehandle as the export point, and then > > match to the project ID on the target inode? That sounds like it > > doesn't even need to encode anything special in the filehandle. > > True, we would not even have to encode them. > > > How do you set a project ID in XFS? > > With the XFS_IOC_SETXFLAGS ioctl. > > On the command line side people usually do it using the xfs_quota tool as part > of setting up the tree quotas, but it can also be done separately using the chproj > subcommand of xfs_io. Is this also queried via the ioctl? If this is a viable way of specifying sub-trees, nfs-ganesha could also use it, though making an ioctl call for each file system object would add some metadata performance hit. Frank
