tree 5d6e4464ab25022c840733b17be5d3480b1dea84
parent bb8b9d095c5c56cce99576cfef0cf9b989f7120d
author Tejun Heo <tj@kernel.org> 1386795776 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1387299555 -0800

kernfs: add REMOVED check to create and rename paths

kernfs currently assumes that the caller doesn't try to create a new
node under a removed parent, rename a removed node, or move a node
under a removed node.  While this works fine for sysfs, it'd be nice
to have protection against such cases especially given that kernfs is
planned to add support for mkdir, rmdir and rename requsts from
userland which may make race conditions more likely.

This patch updates create and rename paths to check REMOVED and fail
the operation with -ENOENT if performed on or towards removed nodes.
Note that remove path already has such check.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>