From: Eric Sandeen <esandeen@redhat.com>
To: xfs <linux-xfs@vger.kernel.org>
Cc: Bill O'Donnell <bodonnel@redhat.com>
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: <59ebcf23-9e32-e219-ef8b-9aa7ab2444c2@redhat.com> (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 <bodonnel@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
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
disabled.
.IP
-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
+and
+.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.
+See
+.BR xfs (5)
+for more information.
.RE
.PP
.PD 0
next 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 ` [PATCH] mkfs.xfs.8: clarify DAX-vs-reflink restrictions in the mkfs.xfs man page 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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