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make struct mountpoint bear the dentry reference to mountpoint, not struct mount

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Using dput_to_list() to shift the contributing reference from ->mnt_mountpoint
to ->mnt_mp->m_dentry.  Dentries are dropped (with dput_to_list()) as soon
as struct mountpoint is destroyed; in cases where we are under namespace_sem
we use the global list, shrinking it in namespace_unlock().  In case of
detaching stuck MNT_LOCKed children at final mntput_no_expire() we use a local
list and shrink it ourselves.  ->mnt_ex_mountpoint crap is gone.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2019-06-30 10:39:08 -04:00
commit 4edbe133f8
2 changed files with 25 additions and 28 deletions
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1
fs/mount.h
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@ -69,7 +69,6 @@ struct mount {
int mnt_expiry_mark; /* true if marked for expiry */
struct hlist_head mnt_pins;
struct fs_pin mnt_umount;
struct dentry *mnt_ex_mountpoint;
} __randomize_layout;
#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */