diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2014-12-22 18:30:08 -0600 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2015-04-02 20:34:18 -0500 |
| commit | 590ce4bcbfb4e0462a720a4ad901e84416080bba (patch) | |
| tree | e5597263904eda7b9e869e57851c6f5dd6737e47 | |
| parent | c003b26ff98ca04a180ff34c38c007a3998d62f9 (diff) | |
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: "Eric W. Biederman" <ebiederm@xmission.com>
| -rw-r--r-- | fs/namespace.c | 4 | ||||
| -rw-r--r-- | fs/pnode.c | 1 | ||||
| -rw-r--r-- | include/linux/mount.h | 1 |
3 files changed, 5 insertions, 1 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 54cbef129f4a..d1708147eb45 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -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) { diff --git a/fs/pnode.c b/fs/pnode.c index bf012af709dd..ac3aa0d43b90 100644 --- a/fs/pnode.c +++ b/fs/pnode.c @@ -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); } } diff --git a/include/linux/mount.h b/include/linux/mount.h index c2c561dc0114..564beeec5d83 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -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 */ |