[PATCH 20/43] xfs: enable sharing of realtime file blocks

Darrick J. Wong
2024-12-13T01:15:28Z

From: Darrick J. Wong <djwong@kernel.org>

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

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
---
fs/xfs/xfs_reflink.c | 25 ++++++++++++++++++++-----
1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 24f545687b8730..78b47b2ac12453 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
@@ -1187,14 +1188,28 @@ xfs_reflink_update_dest(
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_rmap(rtg)))
+ 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))
@@ -1308,8 +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;
}
@@ -1568,8 +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. */