[PATCH 41/56] xfs: create routine to allocate and initialize a realtime refcount btree inode

Darrick J. Wong
2025-02-06T22:45:49Z

Source kernel commit: 4ee3113aaf3f6a3c24fcf952d8489363f56ab375

Create a library routine to allocate and initialize an empty realtime
refcountbt inode. We'll use this for growfs, 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_rtrefcount_btree.c | 28 ++++++++++++++++++++++++++++
libxfs/xfs_rtrefcount_btree.h | 3 +++
3 files changed, 33 insertions(+)

diff --git a/libxfs/xfs_rtgroup.c b/libxfs/xfs_rtgroup.c
index e1f853dd2c5b3e..74701264265ce2 100644
--- a/libxfs/xfs_rtgroup.c
+++ b/libxfs/xfs_rtgroup.c
@@ -31,6 +31,7 @@
#include "xfs_metafile.h"
#include "xfs_metadir.h"
#include "xfs_rtrmap_btree.h"
+#include "xfs_rtrefcount_btree.h"

/* Find the first usable fsblock in this rtgroup. */
static inline uint32_t
@@ -379,6 +380,7 @@ static const struct xfs_rtginode_ops xfs_rtginode_ops[XFS_RTGI_MAX] = {
.fmt_mask = 1U << XFS_DINODE_FMT_META_BTREE,
/* same comment about growfs and rmap inodes applies here */
.enabled = xfs_has_reflink,
+ .create = xfs_rtrefcountbt_create,
},
};

diff --git a/libxfs/xfs_rtrefcount_btree.c b/libxfs/xfs_rtrefcount_btree.c
index cf9f2ee5314dda..fa6c114d9cbc5a 100644
--- a/libxfs/xfs_rtrefcount_btree.c
+++ b/libxfs/xfs_rtrefcount_btree.c
@@ -719,3 +719,31 @@ xfs_iflush_rtrefcount(
ifp->if_broot_bytes, dfp,
XFS_DFORK_SIZE(dip, ip->i_mount, XFS_DATA_FORK));
}
+
+/*
+ * Create a realtime refcount btree inode.
+ */
+int
+xfs_rtrefcountbt_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_rtrefcount_broot_space_calc(mp, 0, 0));
+ if (broot)
+ xfs_btree_init_block(mp, broot, &xfs_rtrefcountbt_ops, 0, 0,
+ ip->i_ino);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE | XFS_ILOG_DBROOT);
+ return 0;
+}
diff --git a/libxfs/xfs_rtrefcount_btree.h b/libxfs/xfs_rtrefcount_btree.h
index e558a10c4744ad..a99b7a8aec8659 100644
--- a/libxfs/xfs_rtrefcount_btree.h
+++ b/libxfs/xfs_rtrefcount_btree.h
@@ -183,4 +183,7 @@ void xfs_rtrefcountbt_to_disk(struct xfs_mount *mp,
struct xfs_rtrefcount_root *dblock, int dblocklen);
void xfs_iflush_rtrefcount(struct xfs_inode *ip, struct xfs_dinode *dip);

+int xfs_rtrefcountbt_create(struct xfs_rtgroup *rtg, struct xfs_inode *ip,
+ struct xfs_trans *tp, bool init);
+
#endif /* __XFS_RTREFCOUNT_BTREE_H__ */