Merge git://oss.sgi.com:8090/xfs/xfs-2.6

[linux-drm-fsl-dcu.git] / include / linux / mount.h

diff --git a/include/linux/mount.h b/include/linux/mount.h
index 403d1a97c512909c311815c4a282af8ea541351f..dab69afee2fa457b3d6feaf8bda7d3701d71c4ca 100644 (file)
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -20,13 +20,14 @@
 struct super_block;
 struct vfsmount;
 struct dentry;
-struct namespace;
+struct mnt_namespace;
 
 #define MNT_NOSUID     0x01
 #define MNT_NODEV      0x02
 #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 */
@@ -52,7 +52,14 @@ struct vfsmount {
        struct list_head mnt_slave_list;/* list of slave mounts */
        struct list_head mnt_slave;     /* slave list entry */
        struct vfsmount *mnt_master;    /* slave is on master->mnt_slave_list */
-       struct namespace *mnt_namespace; /* containing namespace */
+       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;
 };