Commit 31e5abe9 authored by Kay Sievers's avatar Kay Sievers Committed by Greg KH

[PATCH] sysfs: add sysfs_chmod_file()

sysfs: allow changing the permissions for already created attributes
Signed-off-by: default avatarKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 6897089c
......@@ -427,6 +427,41 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
}
/**
* sysfs_chmod_file - update the modified mode value on an object attribute.
* @kobj: object we're acting for.
* @attr: attribute descriptor.
* @mode: file permissions.
*
*/
int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
{
struct dentry *dir = kobj->dentry;
struct dentry *victim;
struct sysfs_dirent *sd;
umode_t umode = (mode & S_IALLUGO) | S_IFREG;
int res = -ENOENT;
down(&dir->d_inode->i_sem);
victim = sysfs_get_dentry(dir, attr->name);
if (!IS_ERR(victim)) {
if (victim->d_inode &&
(victim->d_parent->d_inode == dir->d_inode)) {
sd = victim->d_fsdata;
attr->mode = mode;
sd->s_mode = umode;
victim->d_inode->i_mode = umode;
dput(victim);
res = 0;
}
}
up(&dir->d_inode->i_sem);
return res;
}
EXPORT_SYMBOL_GPL(sysfs_chmod_file);
/**
* sysfs_remove_file - remove an object attribute.
* @kobj: object we're acting for.
......
......@@ -99,6 +99,9 @@ sysfs_create_file(struct kobject *, const struct attribute *);
extern int
sysfs_update_file(struct kobject *, const struct attribute *);
extern int
sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode);
extern void
sysfs_remove_file(struct kobject *, const struct attribute *);
......@@ -140,6 +143,10 @@ static inline int sysfs_update_file(struct kobject * k, const struct attribute *
{
return 0;
}
static inline int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
{
return 0;
}
static inline void sysfs_remove_file(struct kobject * k, const struct attribute * a)
{
......
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