rename thread_info to stack

[powerpc.git] / include / linux / mount.h

diff --git a/include/linux/mount.h b/include/linux/mount.h
index e357dc8..dab69af 100644 (file)
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -27,6 +27,7 @@ struct mnt_namespace;
 #define MNT_NOEXEC     0x04
 #define MNT_NOATIME    0x08
 #define MNT_NODIRATIME 0x10
+#define MNT_RELATIME   0x20
 
 #define MNT_SHRINKABLE 0x100
 
@@ -42,9 +43,8 @@ struct vfsmount {
        struct super_block *mnt_sb;     /* pointer to superblock */
        struct list_head mnt_mounts;    /* list of children, anchored here */
        struct list_head mnt_child;     /* and going through their mnt_child */
-       atomic_t mnt_count;
        int mnt_flags;
-       int mnt_expiry_mark;            /* true if marked for expiry */
+       /* 4 bytes hole on 64bits arches */
        char *mnt_devname;              /* Name of device e.g. /dev/dsk/hda1 */
        struct list_head mnt_list;
        struct list_head mnt_expire;    /* link in fs-specific expiry list */
@@ -53,6 +53,13 @@ struct vfsmount {
        struct list_head mnt_slave;     /* slave list entry */
        struct vfsmount *mnt_master;    /* slave is on master->mnt_slave_list */
        struct mnt_namespace *mnt_ns;   /* containing namespace */
+       /*
+        * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount
+        * to let these frequently modified fields in a separate cache line
+        * (so that reads of mnt_flags wont ping-pong on SMP machines)
+        */
+       atomic_t mnt_count;
+       int mnt_expiry_mark;            /* true if marked for expiry */
        int mnt_pinned;
 };