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namespace.c: get rid of mnt_ghosts 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-09-28 23:10:55 -04:00
parent 9559f68915
commit aba809cf09
3 changed files with 9 additions and 18 deletions
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2
fs/mount.h
View File

@ -55,7 +55,7 @@ struct mount {
int mnt_group_id; /* peer group identifier */
int mnt_expiry_mark; /* true if marked for expiry */
int mnt_pinned;
int mnt_ghosts;
struct path mnt_ex_mountpoint;
};
#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */

22
fs/namespace.c
View File

@ -1136,20 +1136,8 @@ static void namespace_unlock(void)
while (!list_empty(&head)) {
mnt = list_first_entry(&head, struct mount, mnt_hash);
list_del_init(&mnt->mnt_hash);
if (mnt_has_parent(mnt)) {
struct dentry *dentry;
struct mount *m;
br_write_lock(&vfsmount_lock);
dentry = mnt->mnt_mountpoint;
m = mnt->mnt_parent;
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt_parent = mnt;
m->mnt_ghosts--;
br_write_unlock(&vfsmount_lock);
dput(dentry);
mntput(&m->mnt);
}
if (mnt->mnt_ex_mountpoint.mnt)
path_put(&mnt->mnt_ex_mountpoint);
mntput(&mnt->mnt);
}
}
@ -1181,8 +1169,12 @@ void umount_tree(struct mount *mnt, int propagate)
p->mnt_ns = NULL;
list_del_init(&p->mnt_child);
if (mnt_has_parent(p)) {
p->mnt_parent->mnt_ghosts++;
put_mountpoint(p->mnt_mp);
/* move the reference to mountpoint into ->mnt_ex_mountpoint */
p->mnt_ex_mountpoint.dentry = p->mnt_mountpoint;
p->mnt_ex_mountpoint.mnt = &p->mnt_parent->mnt;
p->mnt_mountpoint = p->mnt.mnt_root;
p->mnt_parent = p;
p->mnt_mp = NULL;
}
change_mnt_propagation(p, MS_PRIVATE);

3
fs/pnode.c
View File

@ -278,8 +278,7 @@ int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp,
*/
static inline int do_refcount_check(struct mount *mnt, int count)
{
int mycount = mnt_get_count(mnt) - mnt->mnt_ghosts;
return (mycount > count);
return mnt_get_count(mnt) > count;
}
/*