From: Darrick J. Wong <djwong@xxxxxxxxxx>
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@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_rtrmap_btree.c | 34 ++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_rtrmap_btree.h | 4 ++++
2 files changed, 38 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_rtrmap_btree.c b/fs/xfs/libxfs/xfs_rtrmap_btree.c
index e2ee2a500ca38..b824562bdc2ec 100644
--- a/fs/xfs/libxfs/xfs_rtrmap_btree.c
+++ b/fs/xfs/libxfs/xfs_rtrmap_btree.c
@@ -868,3 +868,37 @@ 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 @*ipp, the caller must finish setting up the incore
+ * inode and release it.
+ */
+int
+xfs_rtrmapbt_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_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/fs/xfs/libxfs/xfs_rtrmap_btree.h b/fs/xfs/libxfs/xfs_rtrmap_btree.h
index 2b26a05f90779..108ab8c0aea44 100644
--- a/fs/xfs/libxfs/xfs_rtrmap_btree.h
+++ b/fs/xfs/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, struct xfs_inode **ipp);
+
#endif /* __XFS_RTRMAP_BTREE_H__ */
