diff mbox

[17/17] Add the parent pointer support to the superblock version 5.

Message ID 1508367333-3237-18-git-send-email-allison.henderson@oracle.com (mailing list archive)
State Superseded
Headers show

Commit Message

Allison Henderson Oct. 18, 2017, 10:55 p.m. UTC
[dchinner: forward ported and cleaned up]
[achender: rebased and added parent pointer attribute to
           compatible attributes mask]

Signed-off-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
v2: remove unrelated type clean up in xfs_format.h

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/libxfs/xfs_format.h | 7 +++++--
 fs/xfs/libxfs/xfs_fs.h     | 1 +
 fs/xfs/xfs_fsops.c         | 4 +++-
 3 files changed, 9 insertions(+), 3 deletions(-)

Comments

Amir Goldstein Oct. 19, 2017, 3:57 a.m. UTC | #1
On Thu, Oct 19, 2017 at 1:55 AM, Allison Henderson
<allison.henderson@oracle.com> wrote:
> [dchinner: forward ported and cleaned up]
> [achender: rebased and added parent pointer attribute to
>            compatible attributes mask]
>
> Signed-off-by: Mark Tinguely <tinguely@sgi.com>
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
> v2: remove unrelated type clean up in xfs_format.h

I'm curious how XFS_SB_VERSION2_PARENTBIT fits into the picture?
old relic?

>
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
>  fs/xfs/libxfs/xfs_format.h | 7 +++++--
>  fs/xfs/libxfs/xfs_fs.h     | 1 +
>  fs/xfs/xfs_fsops.c         | 4 +++-
>  3 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
> index 121862a..f3e3132 100644
> --- a/fs/xfs/libxfs/xfs_format.h
> +++ b/fs/xfs/libxfs/xfs_format.h
> @@ -459,10 +459,12 @@ xfs_sb_has_compat_feature(
>  #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)                /* free inode btree */
>  #define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)                /* reverse map btree */
>  #define XFS_SB_FEAT_RO_COMPAT_REFLINK  (1 << 2)                /* reflinked files */
> +#define XFS_SB_FEAT_RO_COMPAT_PARENT   (1 << 3)        /* parent inode ptr */
>  #define XFS_SB_FEAT_RO_COMPAT_ALL \
>                 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
>                  XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
> -                XFS_SB_FEAT_RO_COMPAT_REFLINK)
> +                XFS_SB_FEAT_RO_COMPAT_REFLINK| \
> +                XFS_SB_FEAT_RO_COMPAT_PARENT)
>  #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN  ~XFS_SB_FEAT_RO_COMPAT_ALL
>  static inline bool
>  xfs_sb_has_ro_compat_feature(
> @@ -558,7 +560,8 @@ static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
>
>  static inline bool xfs_sb_version_hasparent(struct xfs_sb *sbp)
>  {
> -       return false; /* We'll enable this at the end of the set */
> +       return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
> +               (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_PARENT));
>  }
>
>  /*
> diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
> index 8c61f21..b8108f8 100644
> --- a/fs/xfs/libxfs/xfs_fs.h
> +++ b/fs/xfs/libxfs/xfs_fs.h
> @@ -222,6 +222,7 @@ typedef struct xfs_fsop_resblks {
>  #define XFS_FSOP_GEOM_FLAGS_SPINODES   0x40000 /* sparse inode chunks  */
>  #define XFS_FSOP_GEOM_FLAGS_RMAPBT     0x80000 /* reverse mapping btree */
>  #define XFS_FSOP_GEOM_FLAGS_REFLINK    0x100000 /* files can share blocks */
> +#define XFS_FSOP_GEOM_FLAGS_PARENT     0x200000 /* parent pointers */
>
>  /*
>   * Minimum and maximum sizes need for growth checks.
> diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
> index 8f22fc5..9a0ce52 100644
> --- a/fs/xfs/xfs_fsops.c
> +++ b/fs/xfs/xfs_fsops.c
> @@ -111,7 +111,9 @@ xfs_fs_geometry(
>                         (xfs_sb_version_hasrmapbt(&mp->m_sb) ?
>                                 XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) |
>                         (xfs_sb_version_hasreflink(&mp->m_sb) ?
> -                               XFS_FSOP_GEOM_FLAGS_REFLINK : 0);
> +                               XFS_FSOP_GEOM_FLAGS_REFLINK : 0) |
> +                       (xfs_sb_version_hasparent(&mp->m_sb) ?
> +                               XFS_FSOP_GEOM_FLAGS_PARENT : 0);
>                 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
>                                 mp->m_sb.sb_logsectsize : BBSIZE;
>                 geo->rtsectsize = mp->m_sb.sb_blocksize;
> --
> 2.7.4
>
> --
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Darrick J. Wong Oct. 19, 2017, 7:45 p.m. UTC | #2
On Wed, Oct 18, 2017 at 03:55:33PM -0700, Allison Henderson wrote:
> [dchinner: forward ported and cleaned up]
> [achender: rebased and added parent pointer attribute to
>            compatible attributes mask]
> 
> Signed-off-by: Mark Tinguely <tinguely@sgi.com>
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
> v2: remove unrelated type clean up in xfs_format.h
> 
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
>  fs/xfs/libxfs/xfs_format.h | 7 +++++--
>  fs/xfs/libxfs/xfs_fs.h     | 1 +
>  fs/xfs/xfs_fsops.c         | 4 +++-
>  3 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
> index 121862a..f3e3132 100644
> --- a/fs/xfs/libxfs/xfs_format.h
> +++ b/fs/xfs/libxfs/xfs_format.h
> @@ -459,10 +459,12 @@ xfs_sb_has_compat_feature(
>  #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)		/* free inode btree */
>  #define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)		/* reverse map btree */
>  #define XFS_SB_FEAT_RO_COMPAT_REFLINK  (1 << 2)		/* reflinked files */
> +#define XFS_SB_FEAT_RO_COMPAT_PARENT	(1 << 3)	/* parent inode ptr */
>  #define XFS_SB_FEAT_RO_COMPAT_ALL \
>  		(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
>  		 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
> -		 XFS_SB_FEAT_RO_COMPAT_REFLINK)
> +		 XFS_SB_FEAT_RO_COMPAT_REFLINK| \
> +		 XFS_SB_FEAT_RO_COMPAT_PARENT)
>  #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN	~XFS_SB_FEAT_RO_COMPAT_ALL
>  static inline bool
>  xfs_sb_has_ro_compat_feature(
> @@ -558,7 +560,8 @@ static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
>  
>  static inline bool xfs_sb_version_hasparent(struct xfs_sb *sbp)
>  {
> -	return false; /* We'll enable this at the end of the set */
> +	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
> +		(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_PARENT));
>  }
>  
>  /*
> diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
> index 8c61f21..b8108f8 100644
> --- a/fs/xfs/libxfs/xfs_fs.h
> +++ b/fs/xfs/libxfs/xfs_fs.h
> @@ -222,6 +222,7 @@ typedef struct xfs_fsop_resblks {
>  #define XFS_FSOP_GEOM_FLAGS_SPINODES	0x40000	/* sparse inode chunks	*/
>  #define XFS_FSOP_GEOM_FLAGS_RMAPBT	0x80000	/* reverse mapping btree */
>  #define XFS_FSOP_GEOM_FLAGS_REFLINK	0x100000 /* files can share blocks */
> +#define XFS_FSOP_GEOM_FLAGS_PARENT	0x200000 /* parent pointers */
>  
>  /*
>   * Minimum and maximum sizes need for growth checks.
> diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
> index 8f22fc5..9a0ce52 100644
> --- a/fs/xfs/xfs_fsops.c
> +++ b/fs/xfs/xfs_fsops.c
> @@ -111,7 +111,9 @@ xfs_fs_geometry(
>  			(xfs_sb_version_hasrmapbt(&mp->m_sb) ?
>  				XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) |
>  			(xfs_sb_version_hasreflink(&mp->m_sb) ?
> -				XFS_FSOP_GEOM_FLAGS_REFLINK : 0);
> +				XFS_FSOP_GEOM_FLAGS_REFLINK : 0) |
> +			(xfs_sb_version_hasparent(&mp->m_sb) ?
> +				XFS_FSOP_GEOM_FLAGS_PARENT : 0);
>  		geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
>  				mp->m_sb.sb_logsectsize : BBSIZE;
>  		geo->rtsectsize = mp->m_sb.sb_blocksize;

xfs_fs_fill_super ought to have a warning about parent pointers being
experimental.

--D

> -- 
> 2.7.4
> 
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Darrick J. Wong Oct. 19, 2017, 8:06 p.m. UTC | #3
On Thu, Oct 19, 2017 at 06:57:04AM +0300, Amir Goldstein wrote:
> On Thu, Oct 19, 2017 at 1:55 AM, Allison Henderson
> <allison.henderson@oracle.com> wrote:
> > [dchinner: forward ported and cleaned up]
> > [achender: rebased and added parent pointer attribute to
> >            compatible attributes mask]
> >
> > Signed-off-by: Mark Tinguely <tinguely@sgi.com>
> > Signed-off-by: Dave Chinner <dchinner@redhat.com>
> > Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> > ---
> > v2: remove unrelated type clean up in xfs_format.h
> 
> I'm curious how XFS_SB_VERSION2_PARENTBIT fits into the picture?
> old relic?

A feature bit most probably used by the SGI XFS parent pointer
implementation.  We don't want to reuse that bit and thereby crash into
their code.

--D

> >
> > Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> > ---
> >  fs/xfs/libxfs/xfs_format.h | 7 +++++--
> >  fs/xfs/libxfs/xfs_fs.h     | 1 +
> >  fs/xfs/xfs_fsops.c         | 4 +++-
> >  3 files changed, 9 insertions(+), 3 deletions(-)
> >
> > diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
> > index 121862a..f3e3132 100644
> > --- a/fs/xfs/libxfs/xfs_format.h
> > +++ b/fs/xfs/libxfs/xfs_format.h
> > @@ -459,10 +459,12 @@ xfs_sb_has_compat_feature(
> >  #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)                /* free inode btree */
> >  #define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)                /* reverse map btree */
> >  #define XFS_SB_FEAT_RO_COMPAT_REFLINK  (1 << 2)                /* reflinked files */
> > +#define XFS_SB_FEAT_RO_COMPAT_PARENT   (1 << 3)        /* parent inode ptr */
> >  #define XFS_SB_FEAT_RO_COMPAT_ALL \
> >                 (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
> >                  XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
> > -                XFS_SB_FEAT_RO_COMPAT_REFLINK)
> > +                XFS_SB_FEAT_RO_COMPAT_REFLINK| \
> > +                XFS_SB_FEAT_RO_COMPAT_PARENT)
> >  #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN  ~XFS_SB_FEAT_RO_COMPAT_ALL
> >  static inline bool
> >  xfs_sb_has_ro_compat_feature(
> > @@ -558,7 +560,8 @@ static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
> >
> >  static inline bool xfs_sb_version_hasparent(struct xfs_sb *sbp)
> >  {
> > -       return false; /* We'll enable this at the end of the set */
> > +       return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
> > +               (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_PARENT));
> >  }
> >
> >  /*
> > diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
> > index 8c61f21..b8108f8 100644
> > --- a/fs/xfs/libxfs/xfs_fs.h
> > +++ b/fs/xfs/libxfs/xfs_fs.h
> > @@ -222,6 +222,7 @@ typedef struct xfs_fsop_resblks {
> >  #define XFS_FSOP_GEOM_FLAGS_SPINODES   0x40000 /* sparse inode chunks  */
> >  #define XFS_FSOP_GEOM_FLAGS_RMAPBT     0x80000 /* reverse mapping btree */
> >  #define XFS_FSOP_GEOM_FLAGS_REFLINK    0x100000 /* files can share blocks */
> > +#define XFS_FSOP_GEOM_FLAGS_PARENT     0x200000 /* parent pointers */
> >
> >  /*
> >   * Minimum and maximum sizes need for growth checks.
> > diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
> > index 8f22fc5..9a0ce52 100644
> > --- a/fs/xfs/xfs_fsops.c
> > +++ b/fs/xfs/xfs_fsops.c
> > @@ -111,7 +111,9 @@ xfs_fs_geometry(
> >                         (xfs_sb_version_hasrmapbt(&mp->m_sb) ?
> >                                 XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) |
> >                         (xfs_sb_version_hasreflink(&mp->m_sb) ?
> > -                               XFS_FSOP_GEOM_FLAGS_REFLINK : 0);
> > +                               XFS_FSOP_GEOM_FLAGS_REFLINK : 0) |
> > +                       (xfs_sb_version_hasparent(&mp->m_sb) ?
> > +                               XFS_FSOP_GEOM_FLAGS_PARENT : 0);
> >                 geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
> >                                 mp->m_sb.sb_logsectsize : BBSIZE;
> >                 geo->rtsectsize = mp->m_sb.sb_blocksize;
> > --
> > 2.7.4
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
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Amir Goldstein Oct. 20, 2017, 3:18 a.m. UTC | #4
On Thu, Oct 19, 2017 at 11:06 PM, Darrick J. Wong
<darrick.wong@oracle.com> wrote:
> On Thu, Oct 19, 2017 at 06:57:04AM +0300, Amir Goldstein wrote:
>> On Thu, Oct 19, 2017 at 1:55 AM, Allison Henderson
>> <allison.henderson@oracle.com> wrote:
>> > [dchinner: forward ported and cleaned up]
>> > [achender: rebased and added parent pointer attribute to
>> >            compatible attributes mask]
>> >
>> > Signed-off-by: Mark Tinguely <tinguely@sgi.com>
>> > Signed-off-by: Dave Chinner <dchinner@redhat.com>
>> > Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> > ---
>> > v2: remove unrelated type clean up in xfs_format.h
>>
>> I'm curious how XFS_SB_VERSION2_PARENTBIT fits into the picture?
>> old relic?
>
> A feature bit most probably used by the SGI XFS parent pointer
> implementation.  We don't want to reuse that bit and thereby crash into
> their code.
>

Ah, I was not aware that parallel universe exists.
Perhaps worth a comment near definition of XFS_SB_VERSION2_PARENTBIT
so it won't be confused with Linux parent pointers.

Amir.
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Allison Henderson Oct. 21, 2017, 1:13 a.m. UTC | #5
On 10/19/2017 12:45 PM, Darrick J. Wong wrote:
> On Wed, Oct 18, 2017 at 03:55:33PM -0700, Allison Henderson wrote:
>> [dchinner: forward ported and cleaned up]
>> [achender: rebased and added parent pointer attribute to
>>             compatible attributes mask]
>>
>> Signed-off-by: Mark Tinguely<tinguely@sgi.com>
>> Signed-off-by: Dave Chinner<dchinner@redhat.com>
>> Signed-off-by: Allison Henderson<allison.henderson@oracle.com>
>> ---
>> v2: remove unrelated type clean up in xfs_format.h
>>
>> Signed-off-by: Allison Henderson<allison.henderson@oracle.com>
>> ---
>>   fs/xfs/libxfs/xfs_format.h | 7 +++++--
>>   fs/xfs/libxfs/xfs_fs.h     | 1 +
>>   fs/xfs/xfs_fsops.c         | 4 +++-
>>   3 files changed, 9 insertions(+), 3 deletions(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
>> index 121862a..f3e3132 100644
>> --- a/fs/xfs/libxfs/xfs_format.h
>> +++ b/fs/xfs/libxfs/xfs_format.h
>> @@ -459,10 +459,12 @@ xfs_sb_has_compat_feature(
>>   #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)		/* free inode btree */
>>   #define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)		/* reverse map btree */
>>   #define XFS_SB_FEAT_RO_COMPAT_REFLINK  (1 << 2)		/* reflinked files */
>> +#define XFS_SB_FEAT_RO_COMPAT_PARENT	(1 << 3)	/* parent inode ptr */
>>   #define XFS_SB_FEAT_RO_COMPAT_ALL \
>>   		(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
>>   		 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
>> -		 XFS_SB_FEAT_RO_COMPAT_REFLINK)
>> +		 XFS_SB_FEAT_RO_COMPAT_REFLINK| \
>> +		 XFS_SB_FEAT_RO_COMPAT_PARENT)
>>   #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN	~XFS_SB_FEAT_RO_COMPAT_ALL
>>   static inline bool
>>   xfs_sb_has_ro_compat_feature(
>> @@ -558,7 +560,8 @@ static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
>>   
>>   static inline bool xfs_sb_version_hasparent(struct xfs_sb *sbp)
>>   {
>> -	return false; /* We'll enable this at the end of the set */
>> +	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
>> +		(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_PARENT));
>>   }
>>   
>>   /*
>> diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
>> index 8c61f21..b8108f8 100644
>> --- a/fs/xfs/libxfs/xfs_fs.h
>> +++ b/fs/xfs/libxfs/xfs_fs.h
>> @@ -222,6 +222,7 @@ typedef struct xfs_fsop_resblks {
>>   #define XFS_FSOP_GEOM_FLAGS_SPINODES	0x40000	/* sparse inode chunks	*/
>>   #define XFS_FSOP_GEOM_FLAGS_RMAPBT	0x80000	/* reverse mapping btree */
>>   #define XFS_FSOP_GEOM_FLAGS_REFLINK	0x100000 /* files can share blocks */
>> +#define XFS_FSOP_GEOM_FLAGS_PARENT	0x200000 /* parent pointers */
>>   
>>   /*
>>    * Minimum and maximum sizes need for growth checks.
>> diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
>> index 8f22fc5..9a0ce52 100644
>> --- a/fs/xfs/xfs_fsops.c
>> +++ b/fs/xfs/xfs_fsops.c
>> @@ -111,7 +111,9 @@ xfs_fs_geometry(
>>   			(xfs_sb_version_hasrmapbt(&mp->m_sb) ?
>>   				XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) |
>>   			(xfs_sb_version_hasreflink(&mp->m_sb) ?
>> -				XFS_FSOP_GEOM_FLAGS_REFLINK : 0);
>> +				XFS_FSOP_GEOM_FLAGS_REFLINK : 0) |
>> +			(xfs_sb_version_hasparent(&mp->m_sb) ?
>> +				XFS_FSOP_GEOM_FLAGS_PARENT : 0);
>>   		geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
>>   				mp->m_sb.sb_logsectsize : BBSIZE;
>>   		geo->rtsectsize = mp->m_sb.sb_blocksize;
> xfs_fs_fill_super ought to have a warning about parent pointers being
> experimental.
>
> --D
Sure, I will add a warning blurb in there
>> -- 
>> 2.7.4
>>
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diff mbox

Patch

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 121862a..f3e3132 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -459,10 +459,12 @@  xfs_sb_has_compat_feature(
 #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)		/* free inode btree */
 #define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)		/* reverse map btree */
 #define XFS_SB_FEAT_RO_COMPAT_REFLINK  (1 << 2)		/* reflinked files */
+#define XFS_SB_FEAT_RO_COMPAT_PARENT	(1 << 3)	/* parent inode ptr */
 #define XFS_SB_FEAT_RO_COMPAT_ALL \
 		(XFS_SB_FEAT_RO_COMPAT_FINOBT | \
 		 XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
-		 XFS_SB_FEAT_RO_COMPAT_REFLINK)
+		 XFS_SB_FEAT_RO_COMPAT_REFLINK| \
+		 XFS_SB_FEAT_RO_COMPAT_PARENT)
 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN	~XFS_SB_FEAT_RO_COMPAT_ALL
 static inline bool
 xfs_sb_has_ro_compat_feature(
@@ -558,7 +560,8 @@  static inline bool xfs_sb_version_hasreflink(struct xfs_sb *sbp)
 
 static inline bool xfs_sb_version_hasparent(struct xfs_sb *sbp)
 {
-	return false; /* We'll enable this at the end of the set */
+	return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
+		(sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_PARENT));
 }
 
 /*
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 8c61f21..b8108f8 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -222,6 +222,7 @@  typedef struct xfs_fsop_resblks {
 #define XFS_FSOP_GEOM_FLAGS_SPINODES	0x40000	/* sparse inode chunks	*/
 #define XFS_FSOP_GEOM_FLAGS_RMAPBT	0x80000	/* reverse mapping btree */
 #define XFS_FSOP_GEOM_FLAGS_REFLINK	0x100000 /* files can share blocks */
+#define XFS_FSOP_GEOM_FLAGS_PARENT	0x200000 /* parent pointers */
 
 /*
  * Minimum and maximum sizes need for growth checks.
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 8f22fc5..9a0ce52 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -111,7 +111,9 @@  xfs_fs_geometry(
 			(xfs_sb_version_hasrmapbt(&mp->m_sb) ?
 				XFS_FSOP_GEOM_FLAGS_RMAPBT : 0) |
 			(xfs_sb_version_hasreflink(&mp->m_sb) ?
-				XFS_FSOP_GEOM_FLAGS_REFLINK : 0);
+				XFS_FSOP_GEOM_FLAGS_REFLINK : 0) |
+			(xfs_sb_version_hasparent(&mp->m_sb) ?
+				XFS_FSOP_GEOM_FLAGS_PARENT : 0);
 		geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
 				mp->m_sb.sb_logsectsize : BBSIZE;
 		geo->rtsectsize = mp->m_sb.sb_blocksize;