[PATCH] per-mountpoint noatime/nodiratime

Turn noatime and nodiratime into per-mount instead of per-sb flags.

After all the preparations this is a rather trivial patch.  The mount code
needs to treat the two options as per-mount instead of per-superblock, and
touch_atime needs to be changed to check the new MNT_ flags in addition to
the MS_ flags that are kept for filesystems that are always
noatime/nodiratime but not user settable anymore.  Besides that core code
only nfs needed an update because it's leaving atime updates to the server
and thus sets the S_NOATIME flag on every inode, but needs to know whether
it's a real noatime mount for an getattr optimization.

While we're at it I've killed the IS_NOATIME/IS_NODIRATIME macros that were
only used by touch_atime.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/include/linux/mount.h b/include/linux/mount.h
index b98a709f1794..b7472ae91fa4 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -20,10 +20,12 @@
 #define MNT_NOSUID      0x01
 #define MNT_NODEV       0x02
 #define MNT_NOEXEC      0x04
-#define MNT_SHARED      0x10    /* if the vfsmount is a shared mount */
-#define MNT_UNBINDABLE  0x20    /* if the vfsmount is a unbindable mount */
+#define MNT_NOATIME     0x08
+#define MNT_NODIRATIME  0x10
 
-#define MNT_PNODE_MASK  (MNT_SHARED | MNT_UNBINDABLE)
+#define MNT_SHARED      0x1000  /* if the vfsmount is a shared mount */
+#define MNT_UNBINDABLE  0x2000  /* if the vfsmount is a unbindable mount */
+#define MNT_PNODE_MASK  0x3000  /* propogation flag mask */
 
 struct vfsmount {
         struct list_head mnt_hash;