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mnt: In umount_tree reuse mnt_list instead of mnt_hash

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umount_tree builds a list of mounts that need to be unmounted.
Utilize mnt_list for this purpose instead of mnt_hash.  This begins to
allow keeping a mount on the mnt_hash after it is unmounted, which is
necessary for a properly functioning MNT_LOCKED implementation.

The fact that mnt_list is an ordinary list makding available list_move
is nice bonus.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2014-12-18 13:10:48 -06:00
parent 8318e667f1
commit c003b26ff9
3 changed files with 15 additions and 13 deletions
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6
fs/pnode.c
View file

@ -384,7 +384,7 @@ static void __propagate_umount(struct mount *mnt)
if (child && list_empty(&child->mnt_mounts)) {
list_del_init(&child->mnt_child);
hlist_del_init_rcu(&child->mnt_hash);
hlist_add_before_rcu(&child->mnt_hash, &mnt->mnt_hash);
list_move_tail(&child->mnt_list, &mnt->mnt_list);
}
}
}
@ -396,11 +396,11 @@ static void __propagate_umount(struct mount *mnt)
*
* vfsmount lock must be held for write
*/
int propagate_umount(struct hlist_head *list)
int propagate_umount(struct list_head *list)
{
struct mount *mnt;
hlist_for_each_entry(mnt, list, mnt_hash)
list_for_each_entry(mnt, list, mnt_list)
__propagate_umount(mnt);
return 0;
}