diff options
Diffstat (limited to 'include/linux/mount.h')
| -rw-r--r-- | include/linux/mount.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h index 5ee2df217cdf..d6600e3f7e45 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -14,6 +14,7 @@ #include <linux/types.h> #include <linux/list.h> +#include <linux/nodemask.h> #include <linux/spinlock.h> #include <asm/atomic.h> @@ -28,8 +29,10 @@ struct mnt_namespace; #define MNT_NOATIME 0x08 #define MNT_NODIRATIME 0x10 #define MNT_RELATIME 0x20 +#define MNT_READONLY 0x40 /* does the user want this to be r/o? */ #define MNT_SHRINKABLE 0x100 +#define MNT_IMBALANCED_WRITE_COUNT 0x200 /* just for debugging */ #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ @@ -62,6 +65,11 @@ 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; }; static inline struct vfsmount *mntget(struct vfsmount *mnt) @@ -71,9 +79,12 @@ static inline struct vfsmount *mntget(struct vfsmount *mnt) return mnt; } +extern int mnt_want_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); extern void mnt_unpin(struct vfsmount *mnt); +extern int __mnt_is_readonly(struct vfsmount *mnt); static inline void mntput(struct vfsmount *mnt) { |