From: Darrick J. Wong <djwong@xxxxxxxxxx>
Create a log incompat flag so that we only attempt to process swap
extent log items if the filesystem supports it.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
libxfs/xfs_format.h | 1 +
libxfs/xfs_fs.h | 1 +
libxfs/xfs_sb.c | 3 +++
libxfs/xfs_swapext.h | 24 ++++++++++++++++++++++++
man/man2/ioctl_xfs_fsgeometry.2 | 3 +++
5 files changed, 32 insertions(+)
create mode 100644 libxfs/xfs_swapext.h
diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index 817adb36cb1..1424976ec95 100644
--- a/libxfs/xfs_format.h
+++ b/libxfs/xfs_format.h
@@ -391,6 +391,7 @@ xfs_sb_has_incompat_feature(
}
#define XFS_SB_FEAT_INCOMPAT_LOG_XATTRS (1 << 0) /* Delayed Attributes */
+#define XFS_SB_FEAT_INCOMPAT_LOG_SWAPEXT (1U << 31) /* file extent swap */
#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
(XFS_SB_FEAT_INCOMPAT_LOG_XATTRS)
#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL
diff --git a/libxfs/xfs_fs.h b/libxfs/xfs_fs.h
index 210c17f5a16..a39fd65e6ee 100644
--- a/libxfs/xfs_fs.h
+++ b/libxfs/xfs_fs.h
@@ -239,6 +239,7 @@ typedef struct xfs_fsop_resblks {
#define XFS_FSOP_GEOM_FLAGS_BIGTIME (1 << 21) /* 64-bit nsec timestamps */
#define XFS_FSOP_GEOM_FLAGS_INOBTCNT (1 << 22) /* inobt btree counter */
#define XFS_FSOP_GEOM_FLAGS_NREXT64 (1 << 23) /* large extent counters */
+#define XFS_FSOP_GEOM_FLAGS_ATOMIC_SWAP (1U << 31) /* atomic file extent swap */
/*
* Minimum and maximum sizes need for growth checks.
diff --git a/libxfs/xfs_sb.c b/libxfs/xfs_sb.c
index 11b922789fe..10f699b4e99 100644
--- a/libxfs/xfs_sb.c
+++ b/libxfs/xfs_sb.c
@@ -23,6 +23,7 @@
#include "xfs_da_format.h"
#include "xfs_health.h"
#include "xfs_ag.h"
+#include "xfs_swapext.h"
/*
* Physical superblock buffer manipulations. Shared with libxfs in userspace.
@@ -1195,6 +1196,8 @@ xfs_fs_geometry(
}
if (xfs_has_large_extent_counts(mp))
geo->flags |= XFS_FSOP_GEOM_FLAGS_NREXT64;
+ if (xfs_swapext_supported(mp))
+ geo->flags |= XFS_FSOP_GEOM_FLAGS_ATOMIC_SWAP;
geo->rtsectsize = sbp->sb_blocksize;
geo->dirblocksize = xfs_dir2_dirblock_bytes(sbp);
diff --git a/libxfs/xfs_swapext.h b/libxfs/xfs_swapext.h
new file mode 100644
index 00000000000..316323339d7
--- /dev/null
+++ b/libxfs/xfs_swapext.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2022 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#ifndef __XFS_SWAPEXT_H_
+#define __XFS_SWAPEXT_H_ 1
+
+/*
+ * Decide if this filesystem supports using log items to swap file extents and
+ * restart the operation if the system fails before the operation completes.
+ *
+ * This can be done to individual file extents by using the block mapping log
+ * intent items introduced with reflink and rmap; or to entire file ranges
+ * using swapext log intent items to track the overall progress across multiple
+ * extent mappings. Realtime is not supported yet.
+ */
+static inline bool xfs_swapext_supported(struct xfs_mount *mp)
+{
+ return (xfs_has_reflink(mp) || xfs_has_rmapbt(mp)) &&
+ !xfs_has_realtime(mp);
+}
+
+#endif /* __XFS_SWAPEXT_H_ */
diff --git a/man/man2/ioctl_xfs_fsgeometry.2 b/man/man2/ioctl_xfs_fsgeometry.2
index f59a6e8a6a2..7c563ca0454 100644
--- a/man/man2/ioctl_xfs_fsgeometry.2
+++ b/man/man2/ioctl_xfs_fsgeometry.2
@@ -211,6 +211,9 @@ Filesystem stores reverse mappings of blocks to owners.
.TP
.B XFS_FSOP_GEOM_FLAGS_REFLINK
Filesystem supports sharing blocks between files.
+.TP
+.B XFS_FSOP_GEOM_FLAGS_ATOMICSWAP
+Filesystem can exchange file contents atomically via FIEXCHANGE_RANGE.
.RE
.SH XFS METADATA HEALTH REPORTING
.PP
