On Thu, Aug 04, 2016 at 08:44:39AM -0700, Christoph Hellwig wrote:
> On Wed, Aug 03, 2016 at 02:46:13PM -0700, Darrick J. Wong wrote:
> > Track the number of blocks used for the rmapbt in the AGF. When we
> > get to the AG reservation code we need this counter to quickly
> > make our reservation during mount.
> >
> > v2: Actually include growfs support.
> >
> > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> > ---
> > fs/xfs/libxfs/xfs_alloc.c | 1 +
> > fs/xfs/libxfs/xfs_format.h | 11 ++++++++---
> > fs/xfs/libxfs/xfs_rmap_btree.c | 6 ++++++
> > fs/xfs/xfs_fsops.c | 1 +
> > 4 files changed, 16 insertions(+), 3 deletions(-)
> >
> > diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
> > index 776ae2f..af1a72e 100644
> > --- a/fs/xfs/libxfs/xfs_alloc.c
> > +++ b/fs/xfs/libxfs/xfs_alloc.c
> > @@ -2264,6 +2264,7 @@ xfs_alloc_log_agf(
> > offsetof(xfs_agf_t, agf_longest),
> > offsetof(xfs_agf_t, agf_btreeblks),
> > offsetof(xfs_agf_t, agf_uuid),
> > + offsetof(xfs_agf_t, agf_rmap_blocks),
> > sizeof(xfs_agf_t)
> > };
> >
> > diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
> > index f814d42..e6a8bea 100644
> > --- a/fs/xfs/libxfs/xfs_format.h
> > +++ b/fs/xfs/libxfs/xfs_format.h
> > @@ -640,12 +640,15 @@ typedef struct xfs_agf {
> > __be32 agf_btreeblks; /* # of blocks held in AGF btrees */
> > uuid_t agf_uuid; /* uuid of filesystem */
> >
> > + __be32 agf_rmap_blocks; /* rmapbt blocks used */
> > + __be32 agf_padding; /* padding */
>
> Now _spare? It could easily be used by the next new field.
The reflink patches will (almost immediately) consume agf_padding
and the next spare for refcount_{root,level,blocks}.
--D
> Otherwise this looks fine to me:
>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
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