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authorTejun Heo <tj@kernel.org>2013-11-29 17:19:09 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-29 18:41:28 -0800
commitac9bba031001704a2339713cc12148857eccc5e5 (patch)
treec058217a47c51021d97454639ed0f7480c73fe6a /include/linux/kernfs.h
parentcf9e5a73aaff0204801dd19cb4bd91d32f32026a (diff)
sysfs, kernfs: implement kernfs_ns_enabled()
fs/sysfs/symlink.c::sysfs_delete_link() tests @sd->s_flags for SYSFS_FLAG_NS. Let's add kernfs_ns_enabled() so that sysfs doesn't have to test sysfs_dirent flag directly. This makes things tidier for kernfs proper too. This is purely cosmetic. v2: To avoid possible NULL deref, use noop dummy implementation which always returns false when !CONFIG_SYSFS. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/kernfs.h')
-rw-r--r--include/linux/kernfs.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index faaf4f29e33d..d65541308419 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -190,6 +190,17 @@ static inline void kernfs_enable_ns(struct sysfs_dirent *sd)
sd->s_flags |= SYSFS_FLAG_NS;
}
+/**
+ * kernfs_ns_enabled - test whether namespace is enabled
+ * @sd: the node to test
+ *
+ * Test whether namespace filtering is enabled for the children of @ns.
+ */
+static inline bool kernfs_ns_enabled(struct sysfs_dirent *sd)
+{
+ return sd->s_flags & SYSFS_FLAG_NS;
+}
+
struct sysfs_dirent *kernfs_find_and_get_ns(struct sysfs_dirent *parent,
const char *name, const void *ns);
void kernfs_get(struct sysfs_dirent *sd);
@@ -232,6 +243,9 @@ static inline enum kernfs_node_type sysfs_type(struct sysfs_dirent *sd)
static inline void kernfs_enable_ns(struct sysfs_dirent *sd) { }
+static inline bool kernfs_ns_enabled(struct sysfs_dirent *sd)
+{ return false; }
+
static inline struct sysfs_dirent *
kernfs_find_and_get_ns(struct sysfs_dirent *parent, const char *name,
const void *ns)