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-rw-r--r--include/linux/mount.h53
1 files changed, 17 insertions, 36 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 5e7a59408dd4..1869ea24a739 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -13,6 +13,7 @@
#include <linux/list.h>
#include <linux/nodemask.h>
#include <linux/spinlock.h>
+#include <linux/seqlock.h>
#include <asm/atomic.h>
struct super_block;
@@ -46,12 +47,24 @@ struct mnt_namespace;
#define MNT_INTERNAL 0x4000
+struct mnt_pcp {
+ int mnt_count;
+ int mnt_writers;
+};
+
struct vfsmount {
struct list_head mnt_hash;
struct vfsmount *mnt_parent; /* fs we are mounted on */
struct dentry *mnt_mountpoint; /* dentry of mountpoint */
struct dentry *mnt_root; /* root of the mounted tree */
struct super_block *mnt_sb; /* pointer to superblock */
+#ifdef CONFIG_SMP
+ struct mnt_pcp __percpu *mnt_pcp;
+ atomic_t mnt_longrefs;
+#else
+ int mnt_count;
+ int mnt_writers;
+#endif
struct list_head mnt_mounts; /* list of children, anchored here */
struct list_head mnt_child; /* and going through their mnt_child */
int mnt_flags;
@@ -70,57 +83,25 @@ struct vfsmount {
struct mnt_namespace *mnt_ns; /* containing namespace */
int mnt_id; /* mount identifier */
int mnt_group_id; /* peer group identifier */
- /*
- * 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;
int mnt_ghosts;
-#ifdef CONFIG_SMP
- int __percpu *mnt_writers;
-#else
- int mnt_writers;
-#endif
};
-static inline int *get_mnt_writers_ptr(struct vfsmount *mnt)
-{
-#ifdef CONFIG_SMP
- return mnt->mnt_writers;
-#else
- return &mnt->mnt_writers;
-#endif
-}
-
-static inline struct vfsmount *mntget(struct vfsmount *mnt)
-{
- if (mnt)
- atomic_inc(&mnt->mnt_count);
- return mnt;
-}
-
struct file; /* forward dec */
extern int mnt_want_write(struct vfsmount *mnt);
extern int mnt_want_write_file(struct file *file);
extern int mnt_clone_write(struct vfsmount *mnt);
extern void mnt_drop_write(struct vfsmount *mnt);
-extern void mntput_no_expire(struct vfsmount *mnt);
+extern void mntput(struct vfsmount *mnt);
+extern struct vfsmount *mntget(struct vfsmount *mnt);
+extern void mntput_long(struct vfsmount *mnt);
+extern struct vfsmount *mntget_long(struct vfsmount *mnt);
extern void mnt_pin(struct vfsmount *mnt);
extern void mnt_unpin(struct vfsmount *mnt);
extern int __mnt_is_readonly(struct vfsmount *mnt);
-static inline void mntput(struct vfsmount *mnt)
-{
- if (mnt) {
- mnt->mnt_expiry_mark = 0;
- mntput_no_expire(mnt);
- }
-}
-
extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
const char *name, void *data);