From: Darrick J. Wong <djwong@xxxxxxxxxx>
Enable upgrading existing filesystems to support the file exchange range
feature.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
man/man8/xfs_admin.8 | 7 +++++++
repair/globals.c | 1 +
repair/globals.h | 1 +
repair/phase2.c | 30 ++++++++++++++++++++++++++++++
repair/xfs_repair.c | 11 +++++++++++
5 files changed, 50 insertions(+)
diff --git a/man/man8/xfs_admin.8 b/man/man8/xfs_admin.8
index 4794d6774ede..63f8ee90307b 100644
--- a/man/man8/xfs_admin.8
+++ b/man/man8/xfs_admin.8
@@ -156,6 +156,13 @@ data fork extent count will be 2^48 - 1, while the maximum attribute fork
extent count will be 2^32 - 1. The filesystem cannot be downgraded after this
feature is enabled. Once enabled, the filesystem will not be mountable by
older kernels. This feature was added to Linux 5.19.
+.TP 0.4i
+.B exchange
+Upgrade a filesystem to support atomic file content exchanges through the
+XFS_IOC_EXCHANGE_RANGE ioctl, and to support online repairs of directories,
+extended attributes, symbolic links, and realtime free space metadata.
+The filesystem cannot be downgraded after this feature is enabled.
+Once enabled, the filesystem will not be mountable by older kernels.
.RE
.TP
.BI \-U " uuid"
diff --git a/repair/globals.c b/repair/globals.c
index 24f720c46afb..c0c45df51d56 100644
--- a/repair/globals.c
+++ b/repair/globals.c
@@ -52,6 +52,7 @@ bool features_changed; /* did we change superblock feature bits? */
bool add_inobtcount; /* add inode btree counts to AGI */
bool add_bigtime; /* add support for timestamps up to 2486 */
bool add_nrext64;
+bool add_exchrange; /* add file content exchange support */
/* misc status variables */
diff --git a/repair/globals.h b/repair/globals.h
index b83a8ae65942..1eadfdbf9ae4 100644
--- a/repair/globals.h
+++ b/repair/globals.h
@@ -93,6 +93,7 @@ extern bool features_changed; /* did we change superblock feature bits? */
extern bool add_inobtcount; /* add inode btree counts to AGI */
extern bool add_bigtime; /* add support for timestamps up to 2486 */
extern bool add_nrext64;
+extern bool add_exchrange; /* add file content exchange support */
/* misc status variables */
diff --git a/repair/phase2.c b/repair/phase2.c
index 06374817964c..83f0c539bb5d 100644
--- a/repair/phase2.c
+++ b/repair/phase2.c
@@ -182,6 +182,34 @@ set_nrext64(
return true;
}
+static bool
+set_exchrange(
+ struct xfs_mount *mp,
+ struct xfs_sb *new_sb)
+{
+ if (xfs_has_exchange_range(mp)) {
+ printf(_("Filesystem already supports exchange-range.\n"));
+ exit(0);
+ }
+
+ if (!xfs_has_crc(mp)) {
+ printf(
+ _("File exchange-range feature only supported on V5 filesystems.\n"));
+ exit(0);
+ }
+
+ if (!xfs_has_reflink(mp)) {
+ printf(
+ _("File exchange-range feature cannot be added without reflink.\n"));
+ exit(0);
+ }
+
+ printf(_("Adding file exchange-range support to filesystem.\n"));
+ new_sb->sb_features_ro_compat |= XFS_SB_FEAT_INCOMPAT_EXCHRANGE;
+ new_sb->sb_features_incompat |= XFS_SB_FEAT_INCOMPAT_NEEDSREPAIR;
+ return true;
+}
+
struct check_state {
struct xfs_sb sb;
uint64_t features;
@@ -290,6 +318,8 @@ upgrade_filesystem(
dirty |= set_bigtime(mp, &new_sb);
if (add_nrext64)
dirty |= set_nrext64(mp, &new_sb);
+ if (add_exchrange)
+ dirty |= set_exchrange(mp, &new_sb);
if (!dirty)
return;
diff --git a/repair/xfs_repair.c b/repair/xfs_repair.c
index cf774964381e..39884015300a 100644
--- a/repair/xfs_repair.c
+++ b/repair/xfs_repair.c
@@ -69,6 +69,7 @@ enum c_opt_nums {
CONVERT_INOBTCOUNT,
CONVERT_BIGTIME,
CONVERT_NREXT64,
+ CONVERT_EXCHRANGE,
C_MAX_OPTS,
};
@@ -77,6 +78,7 @@ static char *c_opts[] = {
[CONVERT_INOBTCOUNT] = "inobtcount",
[CONVERT_BIGTIME] = "bigtime",
[CONVERT_NREXT64] = "nrext64",
+ [CONVERT_EXCHRANGE] = "exchange",
[C_MAX_OPTS] = NULL,
};
@@ -360,6 +362,15 @@ process_args(int argc, char **argv)
_("-c nrext64 only supports upgrades\n"));
add_nrext64 = true;
break;
+ case CONVERT_EXCHRANGE:
+ if (!val)
+ do_abort(
+ _("-c exchange requires a parameter\n"));
+ if (strtol(val, NULL, 0) != 1)
+ do_abort(
+ _("-c exchange only supports upgrades\n"));
+ add_exchrange = true;
+ break;
default:
unknown('c', val);
break;
