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Index: xfsprogs-4.19.0/mkfs/xfs_mkfs.c
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===================================================================
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--- xfsprogs-4.19.0.orig/mkfs/xfs_mkfs.c
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+++ xfsprogs-4.19.0/mkfs/xfs_mkfs.c
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@@ -1973,15 +1973,15 @@ _("Directory ftype field always enabled
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usage();
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}
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- } else {
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+ } else { /* !crcs_enabled */
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/*
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- * The kernel doesn't currently support crc=0,finobt=1
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- * filesystems. If crcs are not enabled and the user has not
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- * explicitly turned finobt on, then silently turn it off to
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- * avoid an unnecessary warning.
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+ * The kernel doesn't support crc=0,finobt=1 filesystems.
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+ * If crcs are not enabled and the user has not explicitly
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+ * turned finobt on, then silently turn it off to avoid an
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+ * unnecessary warning.
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* If the user explicitly tried to use crc=0,finobt=1,
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* then issue an error.
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- * The same is also for sparse inodes.
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+ * The same is also true for sparse inodes and reflink.
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*/
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if (cli->sb_feat.finobt && cli_opt_set(&mopts, M_FINOBT)) {
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fprintf(stderr,
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@@ -2004,7 +2004,7 @@ _("rmapbt not supported without CRC supp
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}
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cli->sb_feat.rmapbt = false;
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- if (cli->sb_feat.reflink) {
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+ if (cli->sb_feat.reflink && cli_opt_set(&mopts, M_REFLINK)) {
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fprintf(stderr,
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_("reflink not supported without CRC support\n"));
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usage();
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@@ -3788,7 +3788,7 @@ main(
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.finobt = true,
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.spinodes = true,
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.rmapbt = false,
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- .reflink = false,
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+ .reflink = true,
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.parent_pointers = false,
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.nodalign = false,
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.nortalign = false,
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Index: xfsprogs-4.19.0/man/man8/mkfs.xfs.8
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===================================================================
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--- xfsprogs-4.19.0.orig/man/man8/mkfs.xfs.8
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+++ xfsprogs-4.19.0/man/man8/mkfs.xfs.8
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@@ -229,9 +229,9 @@ mapping will be changed to the new block
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enables the creation of per-file snapshots and deduplication. It is only
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available for the data forks of regular files.
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.IP
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-By default,
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+By default in Red Hat Enterprise Linux 8,
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.B mkfs.xfs
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-will not create reference count btrees and therefore will not enable the
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+will create reference count btrees and therefore will enable the
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reflink feature. This feature is only available for filesystems created with
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the (default)
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.B \-m crc=1
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@@ -239,6 +239,13 @@ option set. When the option
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.B \-m crc=0
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is used, the reference count btree feature is not supported and reflink is
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disabled.
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+.IP
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+Note: the filesystem DAX mount option (
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+.B \-o dax
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+) is incompatible with
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+reflink-enabled XFS filesystems. To use filesystem DAX with XFS, specify the
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+.B \-m reflink=0
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+option to mkfs.xfs to disable the reflink feature.
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.RE
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.TP
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.BI \-d " data_section_options"
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