xfs: add realtime rmap btree when adding rt volume

If we're adding enough space to the realtime section to require the
creation of new realtime groups, create the rt rmap btree inode before
we start adding the space.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>

1 files changed, 98 insertions, 2 deletions

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 7b7e22b36d48..45c388ad4c1f 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -28,6 +28,8 @@
 #include "xfs_rtgroup.h"
 #include "xfs_quota.h"
 #include "xfs_error.h"
+#include "xfs_btree.h"
+#include "xfs_rmap.h"
 #include "xfs_rtrmap_btree.h"
 
 /*
@@ -1049,6 +1051,87 @@ xfs_growfs_rt_init_primary(
 	return 0;
 }
 
+/* Add a metadata inode for a realtime rmap btree. */
+static int
+xfs_growfsrt_create_rtrmap(
+	struct xfs_rtgroup	*rtg)
+{
+	struct xfs_mount	*mp = rtg->rtg_mount;
+	struct xfs_imeta_update	upd;
+	struct xfs_rmap_irec	rmap = {
+		.rm_startblock	= 0,
+		.rm_blockcount	= mp->m_sb.sb_rextsize,
+		.rm_owner	= XFS_RMAP_OWN_FS,
+		.rm_offset	= 0,
+		.rm_flags	= 0,
+	};
+	struct xfs_btree_cur	*cur;
+	struct xfs_imeta_path	*path;
+	struct xfs_trans	*tp;
+	struct xfs_inode	*ip = NULL;
+	int			error;
+
+	if (!xfs_has_rtrmapbt(mp) || rtg->rtg_rmapip)
+		return 0;
+
+	error = xfs_rtrmapbt_create_path(mp, rtg->rtg_rgno, &path);
+	if (error)
+		return error;
+
+	error = xfs_imeta_ensure_dirpath(mp, path);
+	if (error)
+		goto out_path;
+
+	error = xfs_imeta_start_update(mp, path, &upd);
+	if (error)
+		goto out_path;
+
+	error = xfs_qm_dqattach(upd.dp);
+	if (error)
+		goto out_upd;
+
+	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_imeta_create,
+			xfs_imeta_create_space_res(mp), 0, 0, &tp);
+	if (error)
+		goto out_end;
+
+	error = xfs_rtrmapbt_create(&tp, path, &upd, &ip);
+	if (error)
+		goto out_cancel;
+
+	lockdep_set_class(&ip->i_lock.mr_lock, &xfs_rrmapip_key);
+
+	cur = xfs_rtrmapbt_init_cursor(mp, tp, rtg, ip);
+	error = xfs_rmap_map_raw(cur, &rmap);
+	xfs_btree_del_cursor(cur, error);
+	if (error)
+		goto out_cancel;
+
+	error = xfs_trans_commit(tp);
+	if (error)
+		goto out_end;
+
+	xfs_imeta_end_update(mp, &upd, error);
+	xfs_imeta_free_path(path);
+	xfs_finish_inode_setup(ip);
+	rtg->rtg_rmapip = ip;
+	return 0;
+
+out_cancel:
+	xfs_trans_cancel(tp);
+out_end:
+	/* Have to finish setting up the inode to ensure it's deleted. */
+	if (ip) {
+		xfs_finish_inode_setup(ip);
+		xfs_irele(ip);
+	}
+out_upd:
+	xfs_imeta_end_update(mp, &upd, error);
+out_path:
+	xfs_imeta_free_path(path);
+	return error;
+}
+
 /*
  * Check that changes to the realtime geometry won't affect the minimum
  * log size, which would cause the fs to become unusable.
@@ -1155,7 +1238,9 @@ xfs_growfs_rt(
 		return -EINVAL;
 
 	/* Unsupported realtime features. */
-	if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp) || xfs_has_quota(mp))
+	if (!xfs_has_rtgroups(mp) && xfs_has_rmapbt(mp))
+		return -EOPNOTSUPP;
+	if (xfs_has_reflink(mp) || xfs_has_quota(mp))
 		return -EOPNOTSUPP;
 
 	nrblocks = in->newblocks;
@@ -1278,10 +1363,21 @@ xfs_growfs_rt(
 				nsbp->sb_rbmblocks);
 		nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
 
-		if (xfs_has_rtgroups(mp))
+		if (xfs_has_rtgroups(mp)) {
+			xfs_rgnumber_t	rgno = last_rgno;
+
 			nsbp->sb_rgcount = howmany_64(nsbp->sb_rblocks,
 						      nsbp->sb_rgblocks);
 
+			for_each_rtgroup_range(mp, rgno, nsbp->sb_rgcount, rtg) {
+				error = xfs_growfsrt_create_rtrmap(rtg);
+				if (error) {
+					xfs_rtgroup_put(rtg);
+					break;
+				}
+			}
+		}
+
 		/*
 		 * Start a transaction, get the log reservation.
 		 */