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sysfs, kernfs: implement kernfs_ns_enabled()

Browse source 
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>
This commit is contained in:
Tejun Heo 2013-11-29 17:19:09 -05:00 • committed by Greg Kroah-Hartman
parent cf9e5a73aa
commit ac9bba0310
4 changed files with 21 additions and 7 deletions
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14
include/linux/kernfs.h
View file

@ -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)