[PATCH 05/39] sysfs, kernfs: introduce kernfs_rename[_ns]()

Tejun Heo
2013-11-03T09:53:47Z

Introduce kernfs rename interface, krenfs_rename[_ns]().

This is just rename of sysfs_rename(). No functional changes.
Function comment is added to kernfs_rename_ns() and @new_parent_sd is
renamed to @new_parent for consistency with other kernfs interfaces.

v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
fs/sysfs/dir.c | 23 +++++++++++++++--------
fs/sysfs/symlink.c | 2 +-
fs/sysfs/sysfs.h | 3 ---
include/linux/kernfs.h | 7 +++++++
4 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 3fcaf08..3eb86b3 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -927,20 +927,27 @@ void sysfs_remove_dir(struct kobject *kobj)
}
}

-int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
- const char *new_name, const void *new_ns)
+/**
+ * kernfs_rename_ns - move and rename a kernfs_node
+ * @sd: target node
+ * @new_parent: new parent to put @sd under
+ * @new_name: new name
+ * @new_ns: new namespace tag
+ */
+int kernfs_rename_ns(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent,
+ const char *new_name, const void *new_ns)
{
int error;

mutex_lock(&sysfs_mutex);

error = 0;
- if ((sd->s_parent == new_parent_sd) && (sd->s_ns == new_ns) &&
+ if ((sd->s_parent == new_parent) && (sd->s_ns == new_ns) &&
(strcmp(sd->s_name, new_name) == 0))
goto out; /* nothing to rename */

error = -EEXIST;
- if (sysfs_find_dirent(new_parent_sd, new_name, new_ns))
+ if (sysfs_find_dirent(new_parent, new_name, new_ns))
goto out;

/* rename sysfs_dirent */
@@ -958,11 +965,11 @@ int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
* Move to the appropriate place in the appropriate directories rbtree.
*/
sysfs_unlink_sibling(sd);
- sysfs_get(new_parent_sd);
+ sysfs_get(new_parent);
sysfs_put(sd->s_parent);
sd->s_ns = new_ns;
sd->s_hash = sysfs_name_hash(sd->s_name, sd->s_ns);
- sd->s_parent = new_parent_sd;
+ sd->s_parent = new_parent;
sysfs_link_sibling(sd);

error = 0;
@@ -976,7 +983,7 @@ int sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
{
struct sysfs_dirent *parent_sd = kobj->sd->s_parent;

- return sysfs_rename(kobj->sd, parent_sd, new_name, new_ns);
+ return kernfs_rename_ns(kobj->sd, parent_sd, new_name, new_ns);
}

int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
@@ -989,7 +996,7 @@ int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
new_parent_sd = new_parent_kobj && new_parent_kobj->sd ?
new_parent_kobj->sd : &sysfs_root;

- return sysfs_rename(sd, new_parent_sd, sd->s_name, new_ns);
+ return kernfs_rename_ns(sd, new_parent_sd, sd->s_name, new_ns);
}

/* Relationship between s_mode and the DT_xxx types */
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index 0f46bd3..f9d6056 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -225,7 +225,7 @@ int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *targ,
if (sd->s_symlink.target_sd->s_dir.kobj != targ)
goto out;

- result = sysfs_rename(sd, parent_sd, new, new_ns);
+ result = kernfs_rename_ns(sd, parent_sd, new, new_ns);

out:
sysfs_put(sd);
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 3b796e2..35561a8 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -185,9 +185,6 @@ void release_sysfs_dirent(struct sysfs_dirent *sd);
int sysfs_create_subdir(struct kobject *kobj, const char *name,
struct sysfs_dirent **p_sd);

-int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
- const char *new_name, const void *new_ns);
-
static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd)
{
if (sd) {
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index fe6290d..803d960 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -20,6 +20,8 @@ struct sysfs_dirent *kernfs_create_link(struct sysfs_dirent *parent,
void kernfs_remove(struct sysfs_dirent *sd);
int kernfs_remove_by_name_ns(struct sysfs_dirent *parent, const char *name,
const void *ns);
+int kernfs_rename_ns(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent,
+ const char *new_name, const void *new_ns);

#else /* CONFIG_SYSFS */

@@ -34,6 +36,11 @@ static inline int kernfs_remove_by_name_ns(struct sysfs_dirent *parent,
const char *name, const void *ns)
{ return -ENOSYS; }

+static inline int kernfs_rename_ns(struct sysfs_dirent *sd,
+ struct sysfs_dirent *new_parent,
+ const char *new_name, const void *new_ns)
+{ return -ENOSYS; }
+
#endif /* CONFIG_SYSFS */

static inline int kernfs_remove_by_name(struct sysfs_dirent *parent,
--
1.8.3.1