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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-06-09 06:59:08 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-07-14 14:32:47 +0200 |
| commit | f7a99c5b7c8bd3d3f533c8b38274e33f3da9096e (patch) | |
| tree | 5c326c0ddd1f40eacbe2fd7c888f26b089389f99 /fs/mount.h | |
| parent | fs/direct-io.c: adjust suspicious bit operation (diff) | |
| download | linux-f7a99c5b7c8bd3d3f533c8b38274e33f3da9096e.tar.xz linux-f7a99c5b7c8bd3d3f533c8b38274e33f3da9096e.zip | |
get rid of ->mnt_longterm
it's enough to set ->mnt_ns of internal vfsmounts to something
distinct from all struct mnt_namespace out there; then we can
just use the check for ->mnt_ns != NULL in the fast path of
mntput_no_expire()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/mount.h')
| -rw-r--r-- | fs/mount.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/mount.h b/fs/mount.h index 4ef36d93e5a2..05a2a1185efc 100644 --- a/fs/mount.h +++ b/fs/mount.h @@ -22,7 +22,6 @@ struct mount { struct vfsmount mnt; #ifdef CONFIG_SMP struct mnt_pcp __percpu *mnt_pcp; - atomic_t mnt_longterm; /* how many of the refs are longterm */ #else int mnt_count; int mnt_writers; @@ -49,6 +48,8 @@ struct mount { int mnt_ghosts; }; +#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ + static inline struct mount *real_mount(struct vfsmount *mnt) { return container_of(mnt, struct mount, mnt); @@ -59,6 +60,12 @@ static inline int mnt_has_parent(struct mount *mnt) return mnt != mnt->mnt_parent; } +static inline int is_mounted(struct vfsmount *mnt) +{ + /* neither detached nor internal? */ + return !IS_ERR_OR_NULL(real_mount(mnt)); +} + extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int); static inline void get_mnt_ns(struct mnt_namespace *ns) |