On Fri, Aug 27, 2021 at 10:39:18AM -0500, Eric Sandeen wrote: > 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@xxxxxxxxxx> > Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx> > --- > > 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 "Alternately..." > +.B \-o dax=inode > +mount option to selectively enable DAX mode on non-reflinked files. /me wonders if this is dangerously close to wading into the muck that is "Use dax=inode or even no dax option at all, then make sure nobody shares your file's data blocks to set the DAX fsxattr flag on the file, and /then/ you can have DAX." <shrug> But the only blocker I can see is the misspelling above. --D > +See > +.BR xfs (5) > +for more information. > .RE > .PP > .PD 0 >
