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SubjectRe: [PATCH V4 06/13] fs/xfs: Create function xfs_inode_enable_dax()
On Fri, Feb 21, 2020 at 04:28:21PM -0800, Darrick J. Wong wrote:
> On Thu, Feb 20, 2020 at 04:41:27PM -0800, ira.weiny@intel.com wrote:
> > From: Ira Weiny <ira.weiny@intel.com>
> >
> > xfs_inode_supports_dax() should reflect if the inode can support DAX not
> > that it is enabled for DAX.
> >
> > Change the use of xfs_inode_supports_dax() to reflect only if the inode
> > and underlying storage support dax.
> >
> > Add a new function xfs_inode_enable_dax() which reflects if the inode
>
> Heavily into bikeshedding here, but "enable" sounds like a verb, but
> this function doesn't actually turn dax on for a file, it merely decides
> if we /should/ turn it on.

heheheheh... As Dave said "names are hard"... :-/

>
> xfs_inode_wants_dax() ?

I viewed this as a question as in "enable dax"?

And I _think_ Dave actually suggested the name.

I'll contemplate it some,
Ira

>
> --D
>
> > should be enabled for DAX.
> >
> > Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> >
> > ---
> > Changes from v3:
> > Update functions and names to be more clear
> > Update commit message
> > Merge with
> > 'fs/xfs: Clean up DAX support check'
> > don't allow IS_DAX() on a directory
> > use STATIC macro for static
> > make xfs_inode_supports_dax() static
> > ---
> > fs/xfs/xfs_iops.c | 25 +++++++++++++++++++------
> > 1 file changed, 19 insertions(+), 6 deletions(-)
> >
> > diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> > index 81f2f93caec0..ff711efc5247 100644
> > --- a/fs/xfs/xfs_iops.c
> > +++ b/fs/xfs/xfs_iops.c
> > @@ -1237,19 +1237,18 @@ static const struct inode_operations xfs_inline_symlink_inode_operations = {
> > };
> >
> > /* Figure out if this file actually supports DAX. */
> > -static bool
> > +STATIC bool
> > xfs_inode_supports_dax(
> > struct xfs_inode *ip)
> > {
> > struct xfs_mount *mp = ip->i_mount;
> >
> > /* Only supported on non-reflinked files. */
> > - if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
> > + if (xfs_is_reflink_inode(ip))
> > return false;
> >
> > - /* DAX mount option or DAX iflag must be set. */
> > - if (!(mp->m_flags & XFS_MOUNT_DAX) &&
> > - !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
> > + /* Only supported on regular files. */
> > + if (!S_ISREG(VFS_I(ip)->i_mode))
> > return false;
> >
> > /* Block size must match page size */
> > @@ -1260,6 +1259,20 @@ xfs_inode_supports_dax(
> > return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
> > }
> >
> > +STATIC bool
> > +xfs_inode_enable_dax(
> > + struct xfs_inode *ip)
> > +{
> > + if (!xfs_inode_supports_dax(ip))
> > + return false;
> > +
> > + if (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
> > + return true;
> > + if (ip->i_mount->m_flags & XFS_MOUNT_DAX)
> > + return true;
> > + return false;
> > +}
> > +
> > STATIC void
> > xfs_diflags_to_iflags(
> > struct inode *inode,
> > @@ -1278,7 +1291,7 @@ xfs_diflags_to_iflags(
> > inode->i_flags |= S_SYNC;
> > if (flags & XFS_DIFLAG_NOATIME)
> > inode->i_flags |= S_NOATIME;
> > - if (xfs_inode_supports_dax(ip))
> > + if (xfs_inode_enable_dax(ip))
> > inode->i_flags |= S_DAX;
> > }
> >
> > --
> > 2.21.0
> >

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