[PATCH 24/56] xfs: create routine to allocate and initialize a realtime rmap btree inode

Darrick J. Wong
2025-02-06T22:41:22Z

Source kernel commit: 71b8acb42be60e11810eb43a6f470589fcf7b7dd

Create a library routine to allocate and initialize an empty realtime
rmapbt inode. We'll use this for mkfs and repair.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
libxfs/xfs_rtgroup.c | 2 ++
libxfs/xfs_rtrmap_btree.c | 54 +++++++++++++++++++++++++++++++++++++++++++++
libxfs/xfs_rtrmap_btree.h | 5 ++++
3 files changed, 61 insertions(+)

diff --git a/libxfs/xfs_rtgroup.c b/libxfs/xfs_rtgroup.c
index f0c45e75e52c3e..c40b02be0f41b9 100644
--- a/libxfs/xfs_rtgroup.c
+++ b/libxfs/xfs_rtgroup.c
@@ -30,6 +30,7 @@
#include "xfs_rtbitmap.h"
#include "xfs_metafile.h"
#include "xfs_metadir.h"
+#include "xfs_rtrmap_btree.h"

/* Find the first usable fsblock in this rtgroup. */
static inline uint32_t
@@ -360,6 +361,7 @@ static const struct xfs_rtginode_ops xfs_rtginode_ops[XFS_RTGI_MAX] = {
* rtrmapbt predicate here.
*/
.enabled = xfs_has_rmapbt,
+ .create = xfs_rtrmapbt_create,
},
};

diff --git a/libxfs/xfs_rtrmap_btree.c b/libxfs/xfs_rtrmap_btree.c
index 39fd9a0ab986e6..a14f2bec8aaa52 100644
--- a/libxfs/xfs_rtrmap_btree.c
+++ b/libxfs/xfs_rtrmap_btree.c
@@ -830,3 +830,57 @@ xfs_iflush_rtrmap(
xfs_rtrmapbt_to_disk(ip->i_mount, ifp->if_broot, ifp->if_broot_bytes,
dfp, XFS_DFORK_SIZE(dip, ip->i_mount, XFS_DATA_FORK));
}
+
+/*
+ * Create a realtime rmap btree inode.
+ */
+int
+xfs_rtrmapbt_create(
+ struct xfs_rtgroup *rtg,
+ struct xfs_inode *ip,
+ struct xfs_trans *tp,
+ bool init)
+{
+ struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_btree_block *broot;
+
+ ifp->if_format = XFS_DINODE_FMT_META_BTREE;
+ ASSERT(ifp->if_broot_bytes == 0);
+ ASSERT(ifp->if_bytes == 0);
+
+ /* Initialize the empty incore btree root. */
+ broot = xfs_broot_realloc(ifp, xfs_rtrmap_broot_space_calc(mp, 0, 0));
+ if (broot)
+ xfs_btree_init_block(mp, broot, &xfs_rtrmapbt_ops, 0, 0,
+ ip->i_ino);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE | XFS_ILOG_DBROOT);
+
+ return 0;
+}
+
+/*
+ * Initialize an rmap for a realtime superblock using the potentially updated
+ * rt geometry in the provided @mp.
+ */
+int
+xfs_rtrmapbt_init_rtsb(
+ struct xfs_mount *mp,
+ struct xfs_rtgroup *rtg,
+ struct xfs_trans *tp)
+{
+ struct xfs_rmap_irec rmap = {
+ .rm_blockcount = mp->m_sb.sb_rextsize,
+ .rm_owner = XFS_RMAP_OWN_FS,
+ };
+ struct xfs_btree_cur *cur;
+ int error;
+
+ ASSERT(xfs_has_rtsb(mp));
+ ASSERT(rtg_rgno(rtg) == 0);
+
+ cur = xfs_rtrmapbt_init_cursor(tp, rtg);
+ error = xfs_rmap_map_raw(cur, &rmap);
+ xfs_btree_del_cursor(cur, error);
+ return error;
+}
diff --git a/libxfs/xfs_rtrmap_btree.h b/libxfs/xfs_rtrmap_btree.h
index e97695066920ee..bf73460be274d1 100644
--- a/libxfs/xfs_rtrmap_btree.h
+++ b/libxfs/xfs_rtrmap_btree.h
@@ -193,4 +193,9 @@ void xfs_rtrmapbt_to_disk(struct xfs_mount *mp, struct xfs_btree_block *rblock,
unsigned int dblocklen);
void xfs_iflush_rtrmap(struct xfs_inode *ip, struct xfs_dinode *dip);

+int xfs_rtrmapbt_create(struct xfs_rtgroup *rtg, struct xfs_inode *ip,
+ struct xfs_trans *tp, bool init);
+int xfs_rtrmapbt_init_rtsb(struct xfs_mount *mp, struct xfs_rtgroup *rtg,
+ struct xfs_trans *tp);
+
#endif /* __XFS_RTRMAP_BTREE_H__ */