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For each removed mount we need to calculate where the slaves will end up. To avoid duplicating that work, do it for all mounts to be removed at once, taking the mounts themselves out of propagation graph as we go, then do all transfers; the duplicate work on finding destinations is avoided since if we run into a mount that already had destination found, we don't need to trace the rest of the way. That's guaranteed O(removed mounts) for finding destinations and removing from propagation graph and O(surviving mounts that have master removed) for transfers. Reviewed-by: Christian Brauner <brauner@kernel.org> 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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void bulk_make_private(struct list_head *);
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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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