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vfs: Keep a list of mounts on a mount point

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To spot any possible problems call BUG if a mountpoint
is put when it's list of mounts is not empty.

AV: use hlist instead of list_head

Reviewed-by: Miklos Szeredi <[email protected]>
Signed-off-by: Eric W. Biederman <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Eric W. Biederman 2013-09-22 19:37:01 -07:00 • committed by Al Viro
commit 0a5eb7c818
2 changed files with 8 additions and 0 deletions
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2
fs/mount.h
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@ -21,6 +21,7 @@ struct mnt_pcp {
struct mountpoint {
struct hlist_node m_hash;
struct dentry *m_dentry;
struct hlist_head m_list;
int m_count;
};
@ -51,6 +52,7 @@ struct mount {
struct mount *mnt_master; /* slave is on master->mnt_slave_list */
struct mnt_namespace *mnt_ns; /* containing namespace */
struct mountpoint *mnt_mp; /* where is it mounted */
struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */
#ifdef CONFIG_FSNOTIFY
struct hlist_head mnt_fsnotify_marks;
__u32 mnt_fsnotify_mask;