Make it possible to force XFS to use copy on write all the time, at
least if reflink is turned on.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
libxfs/libxfs_priv.h | 2 ++
libxfs/xfs_refcount.c | 6 ++++++
2 files changed, 8 insertions(+)
diff --git a/libxfs/libxfs_priv.h b/libxfs/libxfs_priv.h
index 41f6b96..527bd49 100644
--- a/libxfs/libxfs_priv.h
+++ b/libxfs/libxfs_priv.h
@@ -517,4 +517,6 @@ int libxfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
+#define xfs_always_cow (false)
+
#endif /* __LIBXFS_INTERNAL_XFS_H__ */
diff --git a/libxfs/xfs_refcount.c b/libxfs/xfs_refcount.c
index e03a9b7..855ab54 100644
--- a/libxfs/xfs_refcount.c
+++ b/libxfs/xfs_refcount.c
@@ -1189,6 +1189,12 @@ xfs_refcount_find_shared(
trace_xfs_refcount_find_shared(mp, agno, agbno, aglen);
+ if (xfs_always_cow) {
+ *fbno = agbno;
+ *flen = aglen;
+ return 0;
+ }
+
error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
if (error)
goto out;
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