Hi Ryan,
You could use the XFS_IOC_FSINUMBERS/XFS_IOC_FSBULKSTAT API to iterate
over all inodes in the fs.
not having to readdir and recourse the directory tree should safe you
some time (much less i/o).
Also, the interface can be used to make your conversion work parallel
by working on different inode ranges.
You can use xfsdump/xfsrestore code as reference.
Also, not sure if you are using user/group quotas - if you don't,
better make sure that quotas are turned off
to avoid all the accounting caused by your conversion process.
Amir.
On Thu, Jul 28, 2016 at 6:30 AM, Ryan Lindsay <rlindsay@xxxxxxxxxxxxxx> wrote:
> Hi
>
> I have a bit of a specific requirement.
>
> I have a server that currently has a 12T worth of data on it on an xfs
> formatted LV.
>
> currently the file permissions are set via an LDAP, however we are having to
> move to AD for out authentication mechanism. Which will change the value of
> the existing UID's and GID's
>
> Since XFS has a lot of mechanisms that allow things to happen in parallel. I
> was wondering if there was a way of interacting at the file system level to
> facilitate a change of UID's on files rather than having to just chown
> recursively down the file system. The faster I can update the permissions
> the better basically
>
>
> Ryan Lindsay | Research Infrastructure Lead
>
> Faculty of Science IT
> Room G09, Old Geology Bld, University of Melbourne, 3010, VIC
> Telephone +61 3 83446255 | Mobile +61 0407537949 | Email
> rlindsay@xxxxxxxxxxxxxx
>
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