From: Darrick J. Wong <djwong@kernel.org>
Date: Mon, 23 Sep 2024 20:42:36 +0000 (-0700)
Subject: xfs: enable sharing of realtime file blocks
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=dc4b34ea8f65f2af6d25efe74e9df939d2ae56d7;p=users%2Fhch%2Fxfs.git

xfs: enable sharing of realtime file blocks

Update the remapping routines to be able to handle realtime files.

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

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 0b3a78877ad9..cdef7f70df69 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -33,6 +33,7 @@
 #include "xfs_rtrefcount_btree.h"
 #include "xfs_rtalloc.h"
 #include "xfs_rtgroup.h"
+#include "xfs_metafile.h"
 
 /*
  * Copy on Write of Shared Blocks
@@ -1186,14 +1187,29 @@ out_error:
 static int
 xfs_reflink_ag_has_free_space(
 	struct xfs_mount	*mp,
-	xfs_agnumber_t		agno)
+	struct xfs_inode	*ip,
+	xfs_fsblock_t		fsb)
 {
 	struct xfs_perag	*pag;
+	xfs_agnumber_t		agno;
 	int			error = 0;
 
 	if (!xfs_has_rmapbt(mp))
 		return 0;
+	if (XFS_IS_REALTIME_INODE(ip)) {
+		struct xfs_rtgroup	*rtg;
+		xfs_rgnumber_t		rgno;
+
+		rgno = xfs_rtb_to_rgno(mp, fsb);
+		rtg = xfs_rtgroup_get(mp, rgno);
+		if (xfs_metafile_resv_critical(rtg->rtg_inodes[XFS_RTGI_RMAP]) ||
+		    xfs_metafile_resv_critical(rtg->rtg_inodes[XFS_RTGI_REFCOUNT]))
+			error = -ENOSPC;
+		xfs_rtgroup_put(rtg);
+		return error;
+	}
 
+	agno = XFS_FSB_TO_AGNO(mp, fsb);
 	pag = xfs_perag_get(mp, agno);
 	if (xfs_ag_resv_critical(pag, XFS_AG_RESV_RMAPBT) ||
 	    xfs_ag_resv_critical(pag, XFS_AG_RESV_METADATA))
@@ -1307,8 +1323,8 @@ xfs_reflink_remap_extent(
 
 	/* No reflinking if the AG of the dest mapping is low on space. */
 	if (dmap_written) {
-		error = xfs_reflink_ag_has_free_space(mp,
-				XFS_FSB_TO_AGNO(mp, dmap->br_startblock));
+		error = xfs_reflink_ag_has_free_space(mp, ip,
+				dmap->br_startblock);
 		if (error)
 			goto out_cancel;
 	}
@@ -1567,8 +1583,8 @@ xfs_reflink_remap_prep(
 
 	/* Check file eligibility and prepare for block sharing. */
 	ret = -EINVAL;
-	/* Don't reflink realtime inodes */
-	if (XFS_IS_REALTIME_INODE(src) || XFS_IS_REALTIME_INODE(dest))
+	/* Can't reflink between data and rt volumes */
+	if (XFS_IS_REALTIME_INODE(src) != XFS_IS_REALTIME_INODE(dest))
 		goto out_unlock;
 
 	/* Don't share DAX file data with non-DAX file. */