diff options
Diffstat (limited to 'include/linux/mount.h')
| -rw-r--r-- | include/linux/mount.h | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h index 51f55f903aff..5d5275364867 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -30,7 +30,7 @@ struct mnt_namespace; #define MNT_STRICTATIME 0x80 #define MNT_SHRINKABLE 0x100 -#define MNT_IMBALANCED_WRITE_COUNT 0x200 /* just for debugging */ +#define MNT_WRITE_HOLD 0x200 #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ @@ -65,13 +65,22 @@ struct vfsmount { int mnt_expiry_mark; /* true if marked for expiry */ int mnt_pinned; int mnt_ghosts; - /* - * This value is not stable unless all of the mnt_writers[] spinlocks - * are held, and all mnt_writer[]s on this mount have 0 as their ->count - */ - atomic_t __mnt_writers; +#ifdef CONFIG_SMP + int *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) @@ -79,7 +88,11 @@ static inline struct vfsmount *mntget(struct vfsmount *mnt) 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 mnt_pin(struct vfsmount *mnt); |