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Subject[RFC PATCH V2 03/12] fs/xfs: Separate functionality of xfs_inode_supports_dax()
Date
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. Leave that to other helper functions.

Change the caller of xfs_inode_supports_dax() to call
xfs_inode_use_dax() which reflects new logic to override the effective
DAX flag with either the mount option or the physical DAX flag.

To make the logic clear create 2 helper functions for the mount and
physical flag.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
fs/xfs/xfs_iops.c | 32 ++++++++++++++++++++++++++------
1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 8afe69ca188b..0a0ea90259e9 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -1234,6 +1234,15 @@ static const struct inode_operations xfs_inline_symlink_inode_operations = {
.update_time = xfs_vn_update_time,
};

+static bool
+xfs_inode_mount_is_dax(
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+
+ return (mp->m_flags & XFS_MOUNT_DAX) == XFS_MOUNT_DAX;
+}
+
/* Figure out if this file actually supports DAX. */
static bool
xfs_inode_supports_dax(
@@ -1245,11 +1254,6 @@ xfs_inode_supports_dax(
if (!S_ISREG(VFS_I(ip)->i_mode) || 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))
- return false;
-
/* Block size must match page size */
if (mp->m_sb.sb_blocksize != PAGE_SIZE)
return false;
@@ -1258,6 +1262,22 @@ xfs_inode_supports_dax(
return xfs_inode_buftarg(ip)->bt_daxdev != NULL;
}

+static bool
+xfs_inode_is_dax(
+ struct xfs_inode *ip)
+{
+ return (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX) == XFS_DIFLAG2_DAX;
+}
+
+static bool
+xfs_inode_use_dax(
+ struct xfs_inode *ip)
+{
+ return xfs_inode_supports_dax(ip) &&
+ (xfs_inode_mount_is_dax(ip) ||
+ xfs_inode_is_dax(ip));
+}
+
STATIC void
xfs_diflags_to_iflags(
struct inode *inode,
@@ -1276,7 +1296,7 @@ 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_use_dax(ip))
inode->i_flags |= S_DAX;
}

--
2.21.0
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