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xfs: walk the rt reverse mapping tree when rebuilding rmap

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When we're rebuilding the data device rmap, if we encounter an "rmap"
format fork, we have to walk the (realtime) rmap btree inode to build
the appropriate mappings.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-11-20 16:20:38 -08:00
parent 366243cc99
commit 2e0629e17c
1 changed files with 52 additions and 1 deletions
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53
fs/xfs/scrub/rmap_repair.c
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@ -31,6 +31,8 @@
#include "xfs_refcount.h"
#include "xfs_refcount_btree.h"
#include "xfs_ag.h"
#include "xfs_rtrmap_btree.h"
#include "xfs_rtgroup.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
@ -504,7 +506,56 @@ xrep_rmap_scan_meta_btree(
struct xrep_rmap_ifork *rf,
struct xfs_inode *ip)
{
return -EFSCORRUPTED; /* XXX placeholder */
struct xfs_scrub *sc = rf->rr->sc;
struct xfs_rtgroup *rtg = NULL;
struct xfs_btree_cur *cur = NULL;
enum xfs_rtg_inodes type;
int error;
if (rf->whichfork != XFS_DATA_FORK)
return -EFSCORRUPTED;
switch (ip->i_metatype) {
case XFS_METAFILE_RTRMAP:
type = XFS_RTGI_RMAP;
break;
default:
ASSERT(0);
return -EFSCORRUPTED;
}
while ((rtg = xfs_rtgroup_next(sc->mp, rtg))) {
if (ip == rtg->rtg_inodes[type])
goto found;
}
/*
* We should never find an rt metadata btree inode that isn't
* associated with an rtgroup yet has ondisk blocks allocated to it.
*/
if (ip->i_nblocks) {
ASSERT(0);
return -EFSCORRUPTED;
}
return 0;
found:
switch (ip->i_metatype) {
case XFS_METAFILE_RTRMAP:
cur = xfs_rtrmapbt_init_cursor(sc->tp, rtg);
break;
default:
ASSERT(0);
error = -EFSCORRUPTED;
goto out_rtg;
}
error = xrep_rmap_scan_iroot_btree(rf, cur);
xfs_btree_del_cursor(cur, error);
out_rtg:
xfs_rtgroup_rele(rtg);
return error;
}
/* Find all the extents from a given AG in an inode fork. */