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From: Eric Sandeen <>
To: xfs <>
Cc: Bill O'Donnell <>
Subject: [PATCH] mkfs.xfs.8: clarify DAX-vs-reflink restrictions in the mkfs.xfs man page
Date: Fri, 27 Aug 2021 10:39:18 -0500	[thread overview]
Message-ID: <> (raw)

Now that we have the tristate dax mount options, it is possible
to enable DAX mode for non-reflinked files on a reflink-capable
filesystem.  Clarify this in the mkfs.xfs manpage.

Reported-by: Bill O'Donnell <>
Signed-off-by: Eric Sandeen <>

diff --git a/man/man8/mkfs.xfs.8 b/man/man8/mkfs.xfs.8
index a7f70285..84ac50e8 100644
--- a/man/man8/mkfs.xfs.8
+++ b/man/man8/mkfs.xfs.8
@@ -316,12 +316,20 @@ option set. When the option
  is used, the reference count btree feature is not supported and reflink is
-Note: the filesystem DAX mount option (
+Note: the filesystem-wide DAX mount options (
  .B \-o dax
-) is incompatible with
-reflink-enabled XFS filesystems.  To use filesystem DAX with XFS, specify the
+.B \-o dax=always
+) are incompatible with
+reflink-enabled XFS filesystems.  To use filesystem-wide DAX with XFS, specify the
  .B \-m reflink=0
  option to mkfs.xfs to disable the reflink feature.
+Alternatey, use the
+.B \-o dax=inode
+mount option to selectively enable DAX mode on non-reflinked files.
+.BR xfs (5)
+for more information.
  .PD 0

             reply	other threads:[~2021-08-27 15:39 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-27 15:39 Eric Sandeen [this message]
2021-08-27 15:46 ` Bill O'Donnell
2021-08-27 15:47   ` Eric Sandeen
2021-08-27 15:49 ` Darrick J. Wong
2021-08-27 16:23   ` Eric Sandeen

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