Re: [PATCH] xfs: Initialize all quota inodes to be NULLFSINO

[Chandra Seetharaman <sekharan@xxxxxxxxxx>]

On Sat, 2013-07-13 at 12:13 +1000, Dave Chinner wrote:
> On Thu, Jul 11, 2013 at 08:47:45PM -0500, Chandra Seetharaman wrote:
> > 
> > mkfs doesn't initialize the quota inodes to NULLFSINO as it
> > does for the other internal inodes. This leads to check for two
> > values (0 and NULLFSINO) to make sure if a quota inode is
> > valid.
> > 
> > Solve that problem by initializing the values to NULLFSINO
> > if they are 0.
> > 
> > Note that these values are not written back to on-disk
> > superblock unless some quota is enabled on the filesystem.
> > 
> > Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
> > ---
> >  fs/xfs/xfs_mount.c |   12 ++++++++++++
> >  1 files changed, 12 insertions(+), 0 deletions(-)
> > 
> > diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> > index 2b0ba35..8b95933 100644
> > --- a/fs/xfs/xfs_mount.c
> > +++ b/fs/xfs/xfs_mount.c
> > @@ -572,6 +572,18 @@ out_unwind:
> >  static void
> >  xfs_sb_quota_from_disk(struct xfs_sb *sbp)
> >  {
> > +   /*
> > +    * older mkfs doesn't initialize quota inodes to NULLFSINO,
> > +    * which leads to two values for a quota inode to be invalid:
> > +    * 0 and NULLFSINO. Fix it.
> > +    */
> > +   if (sbp->sb_uquotino == 0)
> > +           sbp->sb_uquotino = NULLFSINO;
> > +   if (sbp->sb_gquotino == 0)
> > +           sbp->sb_gquotino = NULLFSINO;
> > +   if (sbp->sb_pquotino == 0)
> > +           sbp->sb_pquotino = NULLFSINO;
> 
> There coment needs to point out that this is changing the in-memory
> superblock value right here, so we don't need to make changing
> sb_pquotino dependent on the superblock having support for this
> feature.

But, we are not just changing just for sb_pquotino, right ?

Since we are changing all the fields independent of superblock
supporting sb_pquotino, I thought the comment should be generic.

> 
> Cheers,
> 
> Dave.