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725ab435ff
the only difference between it and CL_SLAVE is in this predicate
in clone_mnt():
if ((flag & CL_SLAVE) ||
((flag & CL_SHARED_TO_SLAVE) && IS_MNT_SHARED(old))) {
However, in case of CL_SHARED_TO_SLAVE we have not allocated any
mount group ids since the time we'd grabbed namespace_sem, so
IS_MNT_SHARED() is equivalent to non-zero ->mnt_group_id. And
in case of CL_SLAVE old has come either from the original tree,
which had ->mnt_group_id allocated for all nodes or from result
of sequence of CL_MAKE_SHARED or CL_MAKE_SHARED|CL_SLAVE copies,
ultimately going back to the original tree. In both cases we are
guaranteed that old->mnt_group_id will be non-zero.
In other words, the predicate is always equal to
(flags & (CL_SLAVE | CL_SHARED_TO_SLAVE)) && old->mnt_group_id
and with that replacement CL_SLAVE and CL_SHARED_TO_SLAVE have exact
same behaviour.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/fs/pnode.h
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*
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* (C) Copyright IBM Corporation 2005.
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*/
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#ifndef _LINUX_PNODE_H
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#define _LINUX_PNODE_H
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#include <linux/list.h>
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#include "mount.h"
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#define IS_MNT_SHARED(m) ((m)->mnt_t_flags & T_SHARED)
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#define IS_MNT_SLAVE(m) ((m)->mnt_master)
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#define IS_MNT_NEW(m) (!(m)->mnt_ns)
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#define CLEAR_MNT_SHARED(m) ((m)->mnt_t_flags &= ~T_SHARED)
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#define IS_MNT_UNBINDABLE(m) ((m)->mnt_t_flags & T_UNBINDABLE)
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#define IS_MNT_MARKED(m) ((m)->mnt_t_flags & T_MARKED)
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#define SET_MNT_MARK(m) ((m)->mnt_t_flags |= T_MARKED)
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#define CLEAR_MNT_MARK(m) ((m)->mnt_t_flags &= ~T_MARKED)
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#define IS_MNT_LOCKED(m) ((m)->mnt.mnt_flags & MNT_LOCKED)
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#define CL_EXPIRE 0x01
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#define CL_SLAVE 0x02
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#define CL_COPY_UNBINDABLE 0x04
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#define CL_MAKE_SHARED 0x08
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#define CL_PRIVATE 0x10
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#define CL_COPY_MNT_NS_FILE 0x40
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/*
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* EXCL[namespace_sem]
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*/
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static inline void set_mnt_shared(struct mount *mnt)
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{
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mnt->mnt_t_flags &= ~T_SHARED_MASK;
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mnt->mnt_t_flags |= T_SHARED;
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}
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static inline bool peers(const struct mount *m1, const struct mount *m2)
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{
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return m1->mnt_group_id == m2->mnt_group_id && m1->mnt_group_id;
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}
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void change_mnt_propagation(struct mount *, int);
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int propagate_mnt(struct mount *, struct mountpoint *, struct mount *,
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struct hlist_head *);
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void propagate_umount(struct list_head *);
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int propagate_mount_busy(struct mount *, int);
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void propagate_mount_unlock(struct mount *);
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void mnt_release_group_id(struct mount *);
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int get_dominating_id(struct mount *mnt, const struct path *root);
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int mnt_get_count(struct mount *mnt);
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void mnt_set_mountpoint(struct mount *, struct mountpoint *,
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struct mount *);
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void mnt_change_mountpoint(struct mount *parent, struct mountpoint *mp,
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struct mount *mnt);
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struct mount *copy_tree(struct mount *, struct dentry *, int);
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bool is_path_reachable(struct mount *, struct dentry *,
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const struct path *root);
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int count_mounts(struct mnt_namespace *ns, struct mount *mnt);
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bool propagation_would_overmount(const struct mount *from,
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const struct mount *to,
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const struct mountpoint *mp);
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#endif /* _LINUX_PNODE_H */
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