[PATCH 6/6] mkfs: deprecate the ascii-ci feature

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From: Darrick J. Wong <djwong@xxxxxxxxxx>

Deprecate this feature, since the feature is broken.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 man/man8/mkfs.xfs.8.in |    1 +
 mkfs/xfs_mkfs.c        |   11 +++++++++++
 2 files changed, 12 insertions(+)


diff --git a/man/man8/mkfs.xfs.8.in b/man/man8/mkfs.xfs.8.in
index 6fc7708b..01f9dc6e 100644
--- a/man/man8/mkfs.xfs.8.in
+++ b/man/man8/mkfs.xfs.8.in
@@ -828,6 +828,7 @@ This transformation roughly corresponds to case insensitivity in ISO
 The transformations are not compatible with other encodings (e.g. UTF8).
 Do not enable this feature unless your entire environment has been coerced
 to ISO 8859-1.
+This feature is deprecated and will be removed in September 2030.
 .IP
 Note: Version 1 directories are not supported.
 .TP
diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 6dc0f335..64f17a8f 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -2150,6 +2150,17 @@ validate_sb_features(
 	struct mkfs_params	*cfg,
 	struct cli_params	*cli)
 {
+	if (cli->sb_feat.nci) {
+		/*
+		 * The ascii-ci feature is deprecated in the upstream Linux
+		 * kernel.  In September 2025 it will be turned off by default
+		 * in the kernel and in September 2030 support will be removed
+		 * entirely.
+		 */
+		fprintf(stdout,
+_("ascii-ci filesystems are deprecated and will not be supported by future versions.\n"));
+	}
+
 	/*
 	 * Now we have blocks and sector sizes set up, check parameters that are
 	 * no longer optional for CRC enabled filesystems.  Catch them up front




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