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fs/xfs: Create function xfs_inode_should_enable_dax() 

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_should_enable_dax() which reflects if the
inode should be enabled for DAX.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Ira Weiny 2020-04-30 07:41:36 -07:00 committed by Darrick J. Wong
parent 02beb2686f
commit f7bf743714
1 changed files with 22 additions and 6 deletions
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28
fs/xfs/xfs_iops.c
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@ -1243,13 +1243,12 @@ xfs_inode_supports_dax(
{
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))
/* Only supported on regular files. */
if (!S_ISREG(VFS_I(ip)->i_mode))
return false;
/* DAX mount option or DAX iflag must be set. */
if (!(mp->m_flags & XFS_MOUNT_DAX_ALWAYS) &&
!(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
/* Only supported on non-reflinked files. */
if (xfs_is_reflink_inode(ip))
return false;
/* Block size must match page size */
@ -1260,6 +1259,23 @@ xfs_inode_supports_dax(
return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
}
static bool
xfs_inode_should_enable_dax(
struct xfs_inode *ip)
{
if (!IS_ENABLED(CONFIG_FS_DAX))
return false;
if (ip->i_mount->m_flags & XFS_MOUNT_DAX_NEVER)
return false;
if (!xfs_inode_supports_dax(ip))
return false;
if (ip->i_mount->m_flags & XFS_MOUNT_DAX_ALWAYS)
return true;
if (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
return true;
return false;
}
STATIC void
xfs_diflags_to_iflags(
struct inode *inode,
@ -1278,7 +1294,7 @@ 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_should_enable_dax(ip))
inode->i_flags |= S_DAX;
}