[17/20] xfs: wire up getfsmap to the realtime reverse mapping btree

Commit Message

Darrick J. Wong Jan. 1, 2019, 2:26 a.m. UTC

From: Darrick J. Wong <[e-mail]>

Connect the getfsmap ioctl to the realtime rmapbt.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 fs/xfs/xfs_fsmap.c |   66 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 64 insertions(+), 2 deletions(-)

Patch

diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c
index 3d76a9e35870..b63435b1df2e 100644
--- a/fs/xfs/xfs_fsmap.c
+++ b/fs/xfs/xfs_fsmap.c
@@ -28,6 +28,7 @@ 
 #include "xfs_refcount_btree.h"
 #include "xfs_alloc_btree.h"
 #include "xfs_rtalloc.h"
+#include "xfs_rtrmap_btree.h"
 
 /* Convert an xfs_fsmap to an fsmap. */
 void
@@ -550,7 +551,65 @@  xfs_getfsmap_rtdev_rtbitmap(
 	return __xfs_getfsmap_rtdev(tp, keys, xfs_getfsmap_rtdev_rtbitmap_query,
 			info);
 }
-#endif /* CONFIG_XFS_RT */
+
+/* Transform a absolute-startblock rmap (rtdev, logdev) into a fsmap */
+STATIC int
+xfs_getfsmap_rtdev_helper(
+	struct xfs_btree_cur		*cur,
+	struct xfs_rmap_irec		*rec,
+	void				*priv)
+{
+	struct xfs_mount		*mp = cur->bc_mp;
+	struct xfs_getfsmap_info	*info = priv;
+	xfs_daddr_t			rec_daddr;
+
+	rec_daddr = XFS_FSB_TO_BB(mp, rec->rm_startblock);
+
+	return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr);
+}
+
+/* Actually query the rtrmap btree. */
+STATIC int
+xfs_getfsmap_rtdev_rmapbt_query(
+	struct xfs_trans		*tp,
+	struct xfs_getfsmap_info	*info)
+{
+	struct xfs_mount		*mp = tp->t_mountp;
+	struct xfs_btree_cur		*bt_cur;
+	int				error;
+
+	/* Query the rtrmapbt */
+	xfs_ilock(mp->m_rrmapip, XFS_ILOCK_SHARED);
+	bt_cur = xfs_rtrmapbt_init_cursor(mp, tp, mp->m_rrmapip);
+	error = xfs_rmap_query_range(bt_cur, &info->low, &info->high,
+			xfs_getfsmap_rtdev_helper, info);
+	if (error)
+		goto err;
+
+	/* Report any gaps at the end of the rtrmapbt */
+	info->last = true;
+	error = xfs_getfsmap_rtdev_helper(bt_cur, &info->high, info);
+	if (error)
+		goto err;
+
+err:
+	xfs_btree_del_cursor(bt_cur, error);
+	xfs_iunlock(mp->m_rrmapip, XFS_ILOCK_SHARED);
+	return error;
+}
+
+/* Execute a getfsmap query against the realtime device rmapbt. */
+STATIC int
+xfs_getfsmap_rtdev_rmapbt(
+	struct xfs_trans		*tp,
+	struct xfs_fsmap		*keys,
+	struct xfs_getfsmap_info	*info)
+{
+	info->missing_owner = XFS_FMR_OWN_FREE;
+	return __xfs_getfsmap_rtdev(tp, keys, xfs_getfsmap_rtdev_rmapbt_query,
+			info);
+}
+#endif
 
 /* Execute a getfsmap query against the regular data device. */
 STATIC int
@@ -854,7 +913,10 @@  xfs_getfsmap(
 #ifdef CONFIG_XFS_RT
 	if (mp->m_rtdev_targp) {
 		handlers[2].dev = new_encode_dev(mp->m_rtdev_targp->bt_dev);
-		handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap;
+		if (use_rmap)
+			handlers[2].fn = xfs_getfsmap_rtdev_rmapbt;
+		else
+			handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap;
 	}
 #endif /* CONFIG_XFS_RT */