From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH v2 19/21] xfs: cross-reference refcount btree during scrub
Date: Tue, 16 Jan 2018 12:26:52 -0800 [thread overview]
Message-ID: <20180116202652.GU5602@magnolia> (raw)
In-Reply-To: <20180116065244.GJ5602@magnolia>
On Mon, Jan 15, 2018 at 10:52:44PM -0800, Darrick J. Wong wrote:
> On Tue, Jan 16, 2018 at 01:44:47PM +1100, Dave Chinner wrote:
> > On Tue, Jan 09, 2018 at 01:25:47PM -0800, Darrick J. Wong wrote:
> > > From: Darrick J. Wong <darrick.wong@oracle.com>
> > >
> > > During metadata btree scrub, we should cross-reference with the
> > > reference counts.
> > >
> > > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > > ---
> > > v2: streamline scrubber arguments, remove stack allocated objects
> > > ---
> >
> > ....
> >
> > > +/* Make sure the refcount records match this data fork extent. */
> > > +STATIC void
> > > +xfs_scrub_bmap_xref_refcount_data(
> > > + struct xfs_scrub_bmap_info *info,
> > > + struct xfs_bmbt_irec *irec,
> > > + xfs_fsblock_t bno)
> >
> > What's in the irec if it's not the block number of the extent we
> > are looking up?
> >
> > Actually, I may have just answered that myself: bno is actually
> > an agbno, not an fsbno. So that should be:
> >
> > xfs_agblock_t agbno)
>
> Er... Yes. Oops, will fix (all of the agbno).
> >
> > > +{
> > > + xfs_agblock_t fbno;
> > > + xfs_extlen_t flen;
> > > + int error;
> > > +
> > > + if (!info->sc->sa.refc_cur)
> > > + return;
> > > +
> > > + /* If this is shared, the inode flag must be set. */
> > > + error = xfs_refcount_find_shared(info->sc->sa.refc_cur, bno,
> > > + irec->br_blockcount, &fbno, &flen, false);
> > > + if (!xfs_scrub_should_check_xref(info->sc, &error,
> > > + &info->sc->sa.refc_cur))
> > > + return;
> > > +
> > > + if (flen != 0 && !xfs_is_reflink_inode(info->sc->ip))
> > > + xfs_scrub_fblock_xref_set_corrupt(info->sc, info->whichfork,
> > > + irec->br_startoff);
> >
> > So is the block corrupt or is the inode flags corrupt? What
> > determines the object we mark as corrupt/needing fixing here?
>
> Hmm. The reflink iflag is broken here, because the iflag is only supposed
> to represent a shortcut for "might any of the data fork blocks shared?"
> Will change to the ino_xref_set_corrupt helper.
Thinking about these three functions a little more--
For the data fork, we only care that a non-reflink inode doesn't have shared
extents.
For the attr fork, we can call xfs_scrub_xref_is_not_shared directly.
For the cow fork, we can call xfs_scrub_xref_is_cow_staging directly.
The inode scrubber should be checking the reflink iflag, not the bmap
scrubber, so that should be refactored a bit too.
--D
>
> --D
>
> > > +/* Make sure the refcount records match this attr fork extent. */
> > > +STATIC void
> > > +xfs_scrub_bmap_xref_refcount_attr(
> > > + struct xfs_scrub_bmap_info *info,
> > > + struct xfs_bmbt_irec *irec,
> > > + xfs_fsblock_t bno)
> >
> > agbno
> >
> > > +{
> > > + xfs_agblock_t fbno;
> > > + xfs_extlen_t flen;
> > > + int error;
> > > +
> > > + if (!info->sc->sa.refc_cur)
> > > + return;
> > > +
> > > + /* No shared attr fork extents */
> > > + error = xfs_refcount_find_shared(info->sc->sa.refc_cur, bno,
> > > + irec->br_blockcount, &fbno, &flen, false);
> > > + if (!xfs_scrub_should_check_xref(info->sc, &error,
> > > + &info->sc->sa.refc_cur))
> > > + return;
> > > +
> > > + if (flen != 0)
> > > + xfs_scrub_fblock_xref_set_corrupt(info->sc, info->whichfork,
> > > + irec->br_startoff);
> > > +}
> > > +
> > > +/* Make sure the refcount records match this CoW fork extent. */
> > > +STATIC void
> > > +xfs_scrub_bmap_xref_refcount_cow(
> > > + struct xfs_scrub_bmap_info *info,
> > > + struct xfs_bmbt_irec *irec,
> > > + xfs_fsblock_t bno)
> >
> > agbno
> >
> > > +{
> > > + if (!info->sc->sa.refc_cur)
> > > + return;
> > > +
> > > + xfs_scrub_xref_has_cow_staging(info->sc, bno, irec->br_blockcount);
> > > +}
> > > +
> > > /* Cross-reference a single rtdev extent record. */
> > > STATIC void
> > > xfs_scrub_bmap_rt_extent_xref(
> > > @@ -243,6 +309,17 @@ xfs_scrub_bmap_extent_xref(
> > > xfs_scrub_xref_is_used_space(info->sc, agbno, len);
> > > xfs_scrub_xref_not_inodes(info->sc, agbno, len);
> > > xfs_scrub_bmap_xref_rmap(info, irec, agbno);
> > > + switch (info->whichfork) {
> > > + case XFS_DATA_FORK:
> > > + xfs_scrub_bmap_xref_refcount_data(info, irec, agbno);
> > > + break;
> > > + case XFS_ATTR_FORK:
> > > + xfs_scrub_bmap_xref_refcount_attr(info, irec, agbno);
> > > + break;
> > > + case XFS_COW_FORK:
> > > + xfs_scrub_bmap_xref_refcount_cow(info, irec, agbno);
> > > + break;
> >
> > This is where the agbno comes from :P
> >
> > > + }
> > >
> > > xfs_scrub_ag_free(info->sc, &info->sc->sa);
> > > }
> > > diff --git a/fs/xfs/scrub/ialloc.c b/fs/xfs/scrub/ialloc.c
> > > index 30603b4..fb16314 100644
> > > --- a/fs/xfs/scrub/ialloc.c
> > > +++ b/fs/xfs/scrub/ialloc.c
> > > @@ -97,6 +97,7 @@ xfs_scrub_iallocbt_chunk_xref(
> > >
> > > xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INODES);
> > > xfs_scrub_xref_owned_by(sc, agbno, len, &oinfo);
> > > + xfs_scrub_xref_not_shared(sc, agbno, len);
> > > }
> > >
> > > /* Is this chunk worth checking? */
> > > diff --git a/fs/xfs/scrub/inode.c b/fs/xfs/scrub/inode.c
> > > index fc546f2..f12586c 100644
> > > --- a/fs/xfs/scrub/inode.c
> > > +++ b/fs/xfs/scrub/inode.c
> > > @@ -652,6 +652,7 @@ xfs_scrub_inode_xref(
> > > xfs_scrub_inode_xref_finobt(sc, ino);
> > > xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INODES);
> > > xfs_scrub_xref_owned_by(sc, agbno, 1, &oinfo);
> > > + xfs_scrub_xref_not_shared(sc, agbno, 1);
> > >
> > > xfs_scrub_ag_free(sc, &sc->sa);
> > > }
> > > diff --git a/fs/xfs/scrub/refcount.c b/fs/xfs/scrub/refcount.c
> > > index df18e47..6e5b12a 100644
> > > --- a/fs/xfs/scrub/refcount.c
> > > +++ b/fs/xfs/scrub/refcount.c
> > > @@ -31,6 +31,7 @@
> > > #include "xfs_sb.h"
> > > #include "xfs_alloc.h"
> > > #include "xfs_rmap.h"
> > > +#include "xfs_refcount.h"
> > > #include "scrub/xfs_scrub.h"
> > > #include "scrub/scrub.h"
> > > #include "scrub/common.h"
> > > @@ -428,3 +429,67 @@ xfs_scrub_refcountbt(
> > >
> > > return error;
> > > }
> > > +
> > > +/* xref check that a cow staging extent is marked in the refcountbt. */
> > > +void
> > > +xfs_scrub_xref_has_cow_staging(
> > > + struct xfs_scrub_context *sc,
> > > + xfs_agblock_t bno,
> >
> > agbno
> >
> > > + xfs_extlen_t len)
> > > +{
> > > + struct xfs_refcount_irec rc;
> > > + bool has_cowflag;
> > > + int has_refcount;
> > > + int error;
> > .....
> > > +/*
> > > + * xref check that the extent is not shared. Only file data blocks
> > > + * can have multiple owners.
> > > + */
> > > +void
> > > +xfs_scrub_xref_not_shared(
> > > + struct xfs_scrub_context *sc,
> > > + xfs_agblock_t bno,
> >
> > agbno
> >
> > Cheers,
> >
> > Dave.
> > --
> > Dave Chinner
> > david@fromorbit.com
> > --
> > 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
> --
> To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
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next prev parent reply other threads:[~2018-01-16 20:26 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-23 0:42 [PATCH v11 00/21] xfs: online scrub xref support Darrick J. Wong
2017-12-23 0:42 ` [PATCH 01/21] xfs: ignore agfl read errors when not scrubbing agfl Darrick J. Wong
2018-01-05 1:12 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 02/21] xfs: catch a few more error codes when scrubbing secondary sb Darrick J. Wong
2018-01-05 1:17 ` Dave Chinner
2018-01-05 1:24 ` Darrick J. Wong
2018-01-05 2:10 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 03/21] xfs: xfs_scrub_bmap should use for_each_xfs_iext Darrick J. Wong
2018-01-05 1:17 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 04/21] xfs: always grab transaction when scrubbing inode Darrick J. Wong
2018-01-05 1:18 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 05/21] xfs: distinguish between corrupt inode and invalid inum in xfs_scrub_get_inode Darrick J. Wong
2018-01-05 1:23 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 06/21] xfs: add scrub cross-referencing helpers for the free space btrees Darrick J. Wong
2018-01-05 1:29 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 07/21] xfs: add scrub cross-referencing helpers for the inode btrees Darrick J. Wong
2018-01-05 1:36 ` Dave Chinner
2018-01-05 2:19 ` Darrick J. Wong
2018-01-05 21:51 ` [PATCH v2 " Darrick J. Wong
2018-01-16 23:05 ` Darrick J. Wong
2018-01-17 0:36 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 08/21] xfs: add scrub cross-referencing helpers for the rmap btrees Darrick J. Wong
2018-01-05 1:40 ` Dave Chinner
2018-01-05 2:49 ` Darrick J. Wong
2018-01-05 3:38 ` Dave Chinner
2018-01-05 21:53 ` [PATCH v2 " Darrick J. Wong
2018-01-06 20:46 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 09/21] xfs: add scrub cross-referencing helpers for the refcount btrees Darrick J. Wong
2018-01-05 1:41 ` Dave Chinner
2017-12-23 0:43 ` [PATCH 10/21] xfs: set up scrub cross-referencing helpers Darrick J. Wong
2018-01-05 2:08 ` Dave Chinner
2018-01-05 3:05 ` Darrick J. Wong
2018-01-05 21:54 ` [PATCH v2 " Darrick J. Wong
2018-01-16 23:06 ` Darrick J. Wong
2018-01-17 0:41 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 11/21] xfs: fix a few erroneous process_error calls in the scrubbers Darrick J. Wong
2018-01-05 2:11 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 12/21] xfs: check btree block ownership with bnobt/rmapbt when scrubbing btree Darrick J. Wong
2018-01-05 2:24 ` Dave Chinner
2018-01-05 2:53 ` Darrick J. Wong
2018-01-05 3:39 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 13/21] xfs: introduce scrubber cross-referencing stubs Darrick J. Wong
2018-01-08 23:36 ` Dave Chinner
2018-01-08 23:59 ` Darrick J. Wong
2018-01-09 21:00 ` [PATCH v2 " Darrick J. Wong
2018-01-10 0:12 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 14/21] xfs: cross-reference with the bnobt Darrick J. Wong
2018-01-08 23:51 ` Dave Chinner
2018-01-09 0:34 ` Darrick J. Wong
2018-01-09 0:57 ` Dave Chinner
2018-01-09 21:15 ` [PATCH v2 " Darrick J. Wong
2018-01-10 0:15 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 15/21] xfs: cross-reference bnobt records with cntbt Darrick J. Wong
2018-01-08 23:55 ` Dave Chinner
2018-01-09 0:37 ` Darrick J. Wong
2018-01-09 21:20 ` [PATCH v2 " Darrick J. Wong
2018-01-10 0:19 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 16/21] xfs: cross-reference inode btrees during scrub Darrick J. Wong
2018-01-09 21:22 ` [PATCH v2 " Darrick J. Wong
2018-01-15 22:17 ` Dave Chinner
2018-01-16 6:30 ` Darrick J. Wong
2018-01-16 23:23 ` [PATCH v3 " Darrick J. Wong
2018-01-17 0:44 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 17/21] xfs: cross-reference reverse-mapping btree Darrick J. Wong
2018-01-09 21:24 ` [PATCH v2 " Darrick J. Wong
2018-01-15 23:04 ` Dave Chinner
2018-01-16 6:38 ` Darrick J. Wong
2018-01-16 23:25 ` [PATCH v3 " Darrick J. Wong
2018-01-17 0:52 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 18/21] xfs: cross-reference the rmapbt data with the refcountbt Darrick J. Wong
2018-01-09 21:25 ` [PATCH v2 " Darrick J. Wong
2018-01-15 23:49 ` Dave Chinner
2018-01-16 6:49 ` Darrick J. Wong
2018-01-16 19:47 ` Darrick J. Wong
2018-01-16 23:26 ` [PATCH v3 " Darrick J. Wong
2018-01-17 1:00 ` Dave Chinner
2018-01-17 1:11 ` Darrick J. Wong
2017-12-23 0:44 ` [PATCH 19/21] xfs: cross-reference refcount btree during scrub Darrick J. Wong
2018-01-09 21:25 ` [PATCH v2 " Darrick J. Wong
2018-01-16 2:44 ` Dave Chinner
2018-01-16 6:52 ` Darrick J. Wong
2018-01-16 20:26 ` Darrick J. Wong [this message]
2018-01-16 23:27 ` [PATCH v3 " Darrick J. Wong
2018-01-17 1:02 ` Dave Chinner
2017-12-23 0:44 ` [PATCH 20/21] xfs: cross-reference the realtime bitmap Darrick J. Wong
2018-01-09 21:26 ` [PATCH v2 " Darrick J. Wong
2018-01-16 2:57 ` Dave Chinner
2018-01-16 6:55 ` Darrick J. Wong
2018-01-16 23:27 ` [PATCH v3 " Darrick J. Wong
2018-01-17 1:03 ` Dave Chinner
2017-12-23 0:45 ` [PATCH 21/21] xfs: cross-reference the block mappings when possible Darrick J. Wong
2018-01-09 21:26 ` [PATCH v2 " Darrick J. Wong
2018-01-16 2:58 ` Dave Chinner
2018-01-16 6:55 ` Darrick J. Wong
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