From: Darrick J. Wong <djwong@kernel.org>
Date: Wed, 3 Jul 2024 21:22:18 +0000 (-0700)
Subject: xfs: create routine to allocate and initialize a realtime rmap btree inode
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=bc08558320033c85997c65f78d9ad0f56b8c39d5;p=users%2Fhch%2Fxfsprogs.git

xfs: create routine to allocate and initialize a realtime rmap btree inode

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>
---

diff --git a/libxfs/xfs_rtrmap_btree.c b/libxfs/xfs_rtrmap_btree.c
index bec1fa886..6aed0cac2 100644
--- a/libxfs/xfs_rtrmap_btree.c
+++ b/libxfs/xfs_rtrmap_btree.c
@@ -802,3 +802,36 @@ 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.
+ *
+ * Regardless of the return value, the caller must clean up @upd.  If a new
+ * inode is returned through @upd->ip, the caller must finish setting up that
+ * incore inode and release it.
+ */
+int
+xfs_rtrmapbt_create(
+	struct xfs_imeta_update	*upd)
+{
+	struct xfs_mount	*mp = upd->mp;
+	struct xfs_ifork	*ifp;
+	int			error;
+
+	error = xfs_imeta_create(upd, S_IFREG);
+	if (error)
+		return error;
+
+	ifp = xfs_ifork_ptr(upd->ip, XFS_DATA_FORK);
+	ifp->if_format = XFS_DINODE_FMT_RMAP;
+	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_rtrmap_broot_space_calc(mp, 0, 0));
+	xfs_btree_init_block(mp, ifp->if_broot, &xfs_rtrmapbt_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_rtrmap_btree.h b/libxfs/xfs_rtrmap_btree.h
index 727ced9cf..4d7d66fd8 100644
--- a/libxfs/xfs_rtrmap_btree.h
+++ b/libxfs/xfs_rtrmap_btree.h
@@ -198,4 +198,8 @@ 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);
 
+struct xfs_imeta_update;
+
+int xfs_rtrmapbt_create(struct xfs_imeta_update *upd);
+
 #endif	/* __XFS_RTRMAP_BTREE_H__ */