[PATCH 12/42] xfs: create routine to allocate and initialize a realtime refcount btree inode

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From: Darrick J. Wong <djwong@xxxxxxxxxx>

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@xxxxxxxxxx>
---
 libxfs/xfs_rtrefcount_btree.c |   34 ++++++++++++++++++++++++++++++++++
 libxfs/xfs_rtrefcount_btree.h |    5 +++++
 2 files changed, 39 insertions(+)


diff --git a/libxfs/xfs_rtrefcount_btree.c b/libxfs/xfs_rtrefcount_btree.c
index 530bb9d361d..fa04395eed0 100644
--- a/libxfs/xfs_rtrefcount_btree.c
+++ b/libxfs/xfs_rtrefcount_btree.c
@@ -764,3 +764,37 @@ xfs_iflush_rtrefcount(
 			ifp->if_broot_bytes, dfp,
 			XFS_DFORK_SIZE(dip, ip->i_mount, XFS_DATA_FORK));
 }
+
+/*
+ * Create a realtime refcount btree inode.
+ *
+ * Regardless of the return value, the caller must clean up @upd.  If a new
+ * inode is returned through *ipp, the caller must finish setting up the incore
+ * inode and release it.
+ */
+int
+xfs_rtrefcountbt_create(
+	struct xfs_imeta_update	*upd,
+	struct xfs_inode	**ipp)
+{
+	struct xfs_mount	*mp = upd->mp;
+	struct xfs_ifork	*ifp;
+	int			error;
+
+	error = xfs_imeta_create(upd, S_IFREG, ipp);
+	if (error)
+		return error;
+
+	ifp = xfs_ifork_ptr(upd->ip, XFS_DATA_FORK);
+	ifp->if_format = XFS_DINODE_FMT_REFCOUNT;
+	ASSERT(ifp->if_broot_bytes == 0);
+	ASSERT(ifp->if_bytes == 0);
+
+	/* Initialize the empty incore btree root. */
+	xfs_iroot_alloc(upd->ip, XFS_DATA_FORK,
+			xfs_rtrefcount_broot_space_calc(mp, 0, 0));
+	xfs_btree_init_block(mp, ifp->if_broot, &xfs_rtrefcountbt_ops,
+			0, 0, upd->ip->i_ino);
+	xfs_trans_log_inode(upd->tp, upd->ip, XFS_ILOG_CORE | XFS_ILOG_DBROOT);
+	return 0;
+}
diff --git a/libxfs/xfs_rtrefcount_btree.h b/libxfs/xfs_rtrefcount_btree.h
index bd070e54781..749c6fd02f8 100644
--- a/libxfs/xfs_rtrefcount_btree.h
+++ b/libxfs/xfs_rtrefcount_btree.h
@@ -188,4 +188,9 @@ 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);
 
+struct xfs_imeta_update;
+
+int xfs_rtrefcountbt_create(struct xfs_imeta_update *upd,
+		struct xfs_inode **ipp);
+
 #endif	/* __XFS_RTREFCOUNT_BTREE_H__ */





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