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authorTejun Heo <tj@kernel.org>2013-11-28 14:54:15 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-29 17:20:13 -0800
commit93b2b8e4aa4317e3fe6414d117deb5f3c362e8bb (patch)
tree0055820ae48856f7ff3bf05c948d0e95d2c73c07 /fs/sysfs/dir.c
parent7c6e2d362c19f01e6d6c8be59d83a89722032884 (diff)
downloadlinux-93b2b8e4aa4317e3fe6414d117deb5f3c362e8bb.tar.bz2
sysfs, kernfs: introduce kernfs_create_dir[_ns]()
Introduce kernfs interface to manipulate a directory which takes and returns sysfs_dirents. create_dir() is renamed to kernfs_create_dir_ns() and its argumantes and return value are updated. create_dir() usages are replaced with kernfs_create_dir_ns() and sysfs_create_subdir() usages are replaced with kernfs_create_dir(). Dup warnings are handled explicitly by sysfs users of the kernfs interface. sysfs_enable_ns() is renamed to kernfs_enable_ns(). This patch doesn't introduce any behavior changes. v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS. v3: kernfs_enable_ns() added. v4: Refreshed on top of "sysfs: drop kobj_ns_type handling, take #2" so that this patch removes sysfs_enable_ns(). Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/sysfs/dir.c')
-rw-r--r--fs/sysfs/dir.c54
1 files changed, 30 insertions, 24 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index aeb08bd3f3dd..cfbf4091fe5c 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -666,9 +666,18 @@ struct sysfs_dirent *sysfs_get_dirent_ns(struct sysfs_dirent *parent_sd,
}
EXPORT_SYMBOL_GPL(sysfs_get_dirent_ns);
-static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
- const char *name, const void *ns,
- struct sysfs_dirent **p_sd)
+/**
+ * kernfs_create_dir_ns - create a directory
+ * @parent: parent in which to create a new directory
+ * @name: name of the new directory
+ * @priv: opaque data associated with the new directory
+ * @ns: optional namespace tag of the directory
+ *
+ * Returns the created node on success, ERR_PTR() value on failure.
+ */
+struct sysfs_dirent *kernfs_create_dir_ns(struct sysfs_dirent *parent,
+ const char *name, void *priv,
+ const void *ns)
{
umode_t mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
struct sysfs_addrm_cxt acxt;
@@ -678,28 +687,21 @@ static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd,
/* allocate */
sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
if (!sd)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
sd->s_ns = ns;
- sd->priv = kobj;
+ sd->priv = priv;
/* link in */
sysfs_addrm_start(&acxt);
- rc = sysfs_add_one(&acxt, sd, parent_sd);
+ rc = __sysfs_add_one(&acxt, sd, parent);
sysfs_addrm_finish(&acxt);
- if (rc == 0)
- *p_sd = sd;
- else
- sysfs_put(sd);
+ if (!rc)
+ return sd;
- return rc;
-}
-
-int sysfs_create_subdir(struct kobject *kobj, const char *name,
- struct sysfs_dirent **p_sd)
-{
- return create_dir(kobj, kobj->sd, name, NULL, p_sd);
+ sysfs_put(sd);
+ return ERR_PTR(rc);
}
/**
@@ -710,7 +712,6 @@ int sysfs_create_subdir(struct kobject *kobj, const char *name,
int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
{
struct sysfs_dirent *parent_sd, *sd;
- int error = 0;
BUG_ON(!kobj);
@@ -722,10 +723,15 @@ int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
if (!parent_sd)
return -ENOENT;
- error = create_dir(kobj, parent_sd, kobject_name(kobj), ns, &sd);
- if (!error)
- kobj->sd = sd;
- return error;
+ sd = kernfs_create_dir_ns(parent_sd, kobject_name(kobj), kobj, ns);
+ if (IS_ERR(sd)) {
+ if (PTR_ERR(sd) == -EEXIST)
+ sysfs_warn_dup(parent_sd, kobject_name(kobj));
+ return PTR_ERR(sd);
+ }
+
+ kobj->sd = sd;
+ return 0;
}
static struct dentry *sysfs_lookup(struct inode *dir, struct dentry *dentry,
@@ -1005,14 +1011,14 @@ int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
}
/**
- * sysfs_enable_ns - enable namespace under a directory
+ * kernfs_enable_ns - enable namespace under a directory
* @sd: directory of interest, should be empty
*
* This is to be called right after @sd is created to enable namespace
* under it. All children of @sd must have non-NULL namespace tags and
* only the ones which match the super_block's tag will be visible.
*/
-void sysfs_enable_ns(struct sysfs_dirent *sd)
+void kernfs_enable_ns(struct sysfs_dirent *sd)
{
WARN_ON_ONCE(sysfs_type(sd) != SYSFS_DIR);
WARN_ON_ONCE(!RB_EMPTY_ROOT(&sd->s_dir.children));