[PATCH 29/56] xfs: online repair of the realtime rmap btree

Darrick J. Wong
2025-02-06T22:42:42Z

Source kernel commit: 6a849bd81b69ccbda5b766cc700f0be86194e4d1

Repair the realtime rmap btree while mounted. Similar to the regular
rmap btree repair code, we walk the data fork mappings of every realtime
file in the filesystem to collect reverse-mapping records in an xfarray.
Then we sort the xfarray, and use the btree bulk loader to create a new
rtrmap btree ondisk. Finally, we swap the btree roots, and reap the old
blocks in the usual way.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
libxfs/xfs_btree_staging.c | 1 +
libxfs/xfs_rtrmap_btree.c | 2 +-
libxfs/xfs_rtrmap_btree.h | 3 +++
3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/libxfs/xfs_btree_staging.c b/libxfs/xfs_btree_staging.c
index b3afb4a142a5e0..d82665ef78398e 100644
--- a/libxfs/xfs_btree_staging.c
+++ b/libxfs/xfs_btree_staging.c
@@ -134,6 +134,7 @@ xfs_btree_stage_ifakeroot(
cur->bc_ino.ifake = ifake;
cur->bc_nlevels = ifake->if_levels;
cur->bc_ino.forksize = ifake->if_fork_size;
+ cur->bc_ino.whichfork = XFS_STAGING_FORK;
cur->bc_flags |= XFS_BTREE_STAGING;
}

diff --git a/libxfs/xfs_rtrmap_btree.c b/libxfs/xfs_rtrmap_btree.c
index 387c9f17118d52..ac51e736e7e489 100644
--- a/libxfs/xfs_rtrmap_btree.c
+++ b/libxfs/xfs_rtrmap_btree.c
@@ -658,7 +658,7 @@ xfs_rtrmapbt_compute_maxlevels(
}

/* Calculate the rtrmap btree size for some records. */
-static unsigned long long
+unsigned long long
xfs_rtrmapbt_calc_size(
struct xfs_mount *mp,
unsigned long long len)
diff --git a/libxfs/xfs_rtrmap_btree.h b/libxfs/xfs_rtrmap_btree.h
index bf73460be274d1..ad76ac7938b602 100644
--- a/libxfs/xfs_rtrmap_btree.h
+++ b/libxfs/xfs_rtrmap_btree.h
@@ -198,4 +198,7 @@ int xfs_rtrmapbt_create(struct xfs_rtgroup *rtg, struct xfs_inode *ip,
int xfs_rtrmapbt_init_rtsb(struct xfs_mount *mp, struct xfs_rtgroup *rtg,
struct xfs_trans *tp);

+unsigned long long xfs_rtrmapbt_calc_size(struct xfs_mount *mp,
+ unsigned long long len);
+
#endif /* __XFS_RTRMAP_BTREE_H__ */