#include <linux/spinlock.h>
#include <asm/atomic.h>
+struct super_block;
+struct vfsmount;
+struct dentry;
+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
#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
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 */
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;
};
extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
const char *name, void *data);
+struct file_system_type;
+extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
+ int flags, const char *name,
+ void *data);
+
struct nameidata;
extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
int mnt_flags, struct list_head *fslist);
extern void mark_mounts_for_expiry(struct list_head *mounts);
+extern void shrink_submounts(struct vfsmount *mountpoint, struct list_head *mounts);
extern spinlock_t vfsmount_lock;
extern dev_t name_to_dev_t(char *name);