[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, 9 insertions, 3 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index f0e353f5bc30..2ca6145f43d6 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -355,14 +355,14 @@ static int show_vfsmnt(struct seq_file *m, void *v)
                 { MS_SYNCHRONOUS, ",sync" },
                 { MS_DIRSYNC, ",dirsync" },
                 { MS_MANDLOCK, ",mand" },
-                { MS_NOATIME, ",noatime" },
-                { MS_NODIRATIME, ",nodiratime" },
                 { 0, NULL }
         };
         static struct proc_fs_info mnt_info[] = {
                 { MNT_NOSUID, ",nosuid" },
                 { MNT_NODEV, ",nodev" },
                 { MNT_NOEXEC, ",noexec" },
+                { MNT_NOATIME, ",noatime" },
+                { MNT_NODIRATIME, ",nodiratime" },
                 { 0, NULL }
         };
         struct proc_fs_info *fs_infop;
@@ -1286,7 +1286,13 @@ long do_mount(char *dev_name, char *dir_name, char *type_page,
                 mnt_flags |= MNT_NODEV;
         if (flags & MS_NOEXEC)
                 mnt_flags |= MNT_NOEXEC;
-        flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE);
+        if (flags & MS_NOATIME)
+                mnt_flags |= MNT_NOATIME;
+        if (flags & MS_NODIRATIME)
+                mnt_flags |= MNT_NODIRATIME;
+
+        flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE |
+                   MS_NOATIME | MS_NODIRATIME);
 
         /* ... and get the mountpoint */
         retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);