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authorTejun Heo <tj@kernel.org>2014-02-03 14:09:11 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-07 15:52:48 -0800
commitb9c9dad0c457d32cf8c7d2e413463c8414c7a7a7 (patch)
treec20eaec5b60bb56f4b4873c2e06cde65edb59d7e /fs/sysfs
parent6a7fed4eefddad48224f1c9d534b4e262f0897f6 (diff)
downloadlinux-b9c9dad0c457d32cf8c7d2e413463c8414c7a7a7.tar.bz2
kernfs: add missing kernfs_active() checks in directory operations
kernfs_iop_lookup(), kernfs_dir_pos() and kernfs_dir_next_pos() were missing kernfs_active() tests before using the found kernfs_node. As deactivated state is currently visible only while a node is being removed, this doesn't pose an actual problem. e.g. lookup succeeding on a deactivated node doesn't harm anything as the eventual file operations are gonna fail and those failures are indistinguishible from the cases in which the lookups had happened before the node was deactivated. However, we're gonna allow new nodes to be created deactivated and then activated explicitly by the kernfs user when it sees fit. This is to support atomically making multiple nodes visible to userland and thus those nodes must not be visible to userland before activated. Let's plug the lookup and readdir holes so that deactivated nodes are invisible to userland. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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