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Commit 590ce4bc authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

mnt: Add MNT_UMOUNT flag 



In some instances it is necessary to know if the the unmounting
process has begun on a mount.  Add MNT_UMOUNT to make that reliably
testable.

This fix gets used in fixing locked mounts in MNT_DETACH

Cc: stable@vger.kernel.org
Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
parent c003b26f

fs/namespace.c

+3 −1
Original line number Diff line number Diff line
@@ -1331,8 +1331,10 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how) 
	struct mount *p;



	/* Gather the mounts to umount */

	for (p = mnt; p; p = next_mnt(p, mnt))

	for (p = mnt; p; p = next_mnt(p, mnt)) {

		p->mnt.mnt_flags |= MNT_UMOUNT;

		list_move(&p->mnt_list, &tmp_list);

	}



	/* Hide the mounts from lookup_mnt and mnt_mounts */

	list_for_each_entry(p, &tmp_list, mnt_list) {

fs/pnode.c

+1 −0
Original line number Diff line number Diff line
@@ -384,6 +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);

			child->mnt.mnt_flags |= MNT_UMOUNT;

			list_move_tail(&child->mnt_list, &mnt->mnt_list);

		}

	}

include/linux/mount.h

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ struct mnt_namespace; 
#define MNT_DOOMED		0x1000000

#define MNT_SYNC_UMOUNT		0x2000000

#define MNT_MARKED		0x4000000

#define MNT_UMOUNT		0x8000000



struct vfsmount {

	struct dentry *mnt_root;	/* root of the mounted tree */