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mnt: Factor umount_mnt from umount_tree 

For future use factor out a function umount_mnt from umount_tree.
This function unhashes a mount and remembers where the mount
was mounted so that eventually when the code makes it to a
sleeping context the mountpoint can be dput.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2015-01-15 22:58:33 -06:00
parent 7bdb11de8e
commit 6a46c5735c
1 changed files with 11 additions and 3 deletions
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14
fs/namespace.c
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@ -819,6 +819,16 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
unhash_mnt(mnt);
}
/*
* vfsmount lock must be held for write
*/
static void umount_mnt(struct mount *mnt)
{
/* old mountpoint will be dropped when we can do that */
mnt->mnt_ex_mountpoint = mnt->mnt_mountpoint;
unhash_mnt(mnt);
}
/*
* vfsmount lock must be held for write
*/
@ -1371,9 +1381,7 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how)
pin_insert_group(&p->mnt_umount, &p->mnt_parent->mnt, &unmounted);
if (mnt_has_parent(p)) {
mnt_add_count(p->mnt_parent, -1);
/* old mountpoint will be dropped when we can do that */
p->mnt_ex_mountpoint = p->mnt_mountpoint;
unhash_mnt(p);
umount_mnt(p);
}
change_mnt_propagation(p, MS_PRIVATE);
}