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sysfs, kernfs: introduce kernfs_create_file[_ns]()

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Introduce kernfs interface to create a file which takes and returns
sysfs_dirents.

The actual file creation part is separated out from
sysfs_add_file_mode_ns() into kernfs_create_file_ns().  The former now
only decides the kernfs_ops to use and the file's size and invokes the
latter.

This patch doesn't introduce behavior changes.

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

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2013-11-28 14:54:24 -05:00 committed by Greg Kroah-Hartman
parent a7dc66dfb4
commit 496f73944a
2 changed files with 60 additions and 11 deletions
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53
fs/sysfs/file.c
View File

@ -912,14 +912,11 @@ static const struct kernfs_ops sysfs_bin_kfops_rw = {
int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
const struct attribute *attr, bool is_bin,
umode_t amode, const void *ns)
umode_t mode, const void *ns)
{
umode_t mode = (amode & S_IALLUGO) | S_IFREG;
const struct kernfs_ops *ops;
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
loff_t size;
int rc;
if (!is_bin) {
struct kobject *kobj = dir_sd->priv;
@ -956,14 +953,47 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
size = battr->size;
}
sd = sysfs_new_dirent(attr->name, mode, SYSFS_KOBJ_ATTR);
sd = kernfs_create_file_ns(dir_sd, attr->name, mode, size,
ops, (void *)attr, ns);
if (IS_ERR(sd)) {
if (PTR_ERR(sd) == -EEXIST)
sysfs_warn_dup(dir_sd, attr->name);
return PTR_ERR(sd);
}
return 0;
}
/**
* kernfs_create_file_ns - create a file
* @parent: directory to create the file in
* @name: name of the file
* @mode: mode of the file
* @size: size of the file
* @ops: kernfs operations for the file
* @priv: private data for the file
* @ns: optional namespace tag of the file
*
* Returns the created node on success, ERR_PTR() value on error.
*/
struct sysfs_dirent *kernfs_create_file_ns(struct sysfs_dirent *parent,
const char *name,
umode_t mode, loff_t size,
const struct kernfs_ops *ops,
void *priv, const void *ns)
{
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
int rc;
sd = sysfs_new_dirent(name, (mode & S_IALLUGO) | S_IFREG,
SYSFS_KOBJ_ATTR);
if (!sd)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
sd->s_attr.ops = ops;
sd->s_attr.size = size;
sd->s_ns = ns;
sd->priv = (void *)attr;
sd->priv = priv;
sysfs_dirent_init_lockdep(sd);
/*
@ -977,13 +1007,14 @@ int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
sd->s_flags |= SYSFS_FLAG_HAS_MMAP;
sysfs_addrm_start(&acxt);
rc = sysfs_add_one(&acxt, sd, dir_sd);
rc = __sysfs_add_one(&acxt, sd, parent);
sysfs_addrm_finish(&acxt);
if (rc)
if (rc) {
sysfs_put(sd);
return rc;
return ERR_PTR(rc);
}
return sd;
}
int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,

18
include/linux/kernfs.h
View File

@ -64,6 +64,11 @@ struct kernfs_ops {
struct sysfs_dirent *kernfs_create_dir_ns(struct sysfs_dirent *parent,
const char *name, void *priv,
const void *ns);
struct sysfs_dirent *kernfs_create_file_ns(struct sysfs_dirent *parent,
const char *name,
umode_t mode, loff_t size,
const struct kernfs_ops *ops,
void *priv, const void *ns);
struct sysfs_dirent *kernfs_create_link(struct sysfs_dirent *parent,
const char *name,
struct sysfs_dirent *target);
@ -82,6 +87,12 @@ kernfs_create_dir_ns(struct sysfs_dirent *parent, const char *name, void *priv,
const void *ns)
{ return ERR_PTR(-ENOSYS); }
static inline struct sysfs_dirent *
kernfs_create_file_ns(struct sysfs_dirent *parent, const char *name,
umode_t mode, loff_t size, const struct kernfs_ops *ops,
void *priv, const void *ns)
{ return ERR_PTR(-ENOSYS); }
static inline struct sysfs_dirent *
kernfs_create_link(struct sysfs_dirent *parent, const char *name,
struct sysfs_dirent *target)
@ -112,6 +123,13 @@ kernfs_create_dir(struct sysfs_dirent *parent, const char *name, void *priv)
return kernfs_create_dir_ns(parent, name, priv, NULL);
}
static inline struct sysfs_dirent *
kernfs_create_file(struct sysfs_dirent *parent, const char *name, umode_t mode,
loff_t size, const struct kernfs_ops *ops, void *priv)
{
return kernfs_create_file_ns(parent, name, mode, size, ops, priv, NULL);
}
static inline int kernfs_remove_by_name(struct sysfs_dirent *parent,
const char *name)
{