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get rid of ->mnt_longterm

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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 <[email protected]>
This commit is contained in:
Al Viro 2012-06-09 00:59:08 -04:00
commit f7a99c5b7c
5 changed files with 26 additions and 72 deletions
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9
fs/mount.h
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@ -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)