[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>

2 files changed, 6 insertions, 7 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 85c5656756b6..d1e370d25f7b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -114,8 +114,7 @@ extern int dir_notify_enable;
 /*
  * Superblock flags that can be altered by MS_REMOUNT
  */
-#define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|\
-                         MS_NODIRATIME)
+#define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK)
 
 /*
  * Old magic mount flag and mask
@@ -161,8 +160,6 @@ extern int dir_notify_enable;
 #define IS_NOQUOTA(inode)       ((inode)->i_flags & S_NOQUOTA)
 #define IS_APPEND(inode)        ((inode)->i_flags & S_APPEND)
 #define IS_IMMUTABLE(inode)     ((inode)->i_flags & S_IMMUTABLE)
-#define IS_NOATIME(inode)       (__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
-#define IS_NODIRATIME(inode)    __IS_FLG(inode, MS_NODIRATIME)
 #define IS_POSIXACL(inode)      __IS_FLG(inode, MS_POSIXACL)
 
 #define IS_DEADDIR(inode)       ((inode)->i_flags & S_DEAD)
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;