redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

[PATCH] sysfs: add sysfs_chmod_file() 

sysfs: allow changing the permissions for already created attributes

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Kay Sievers 2005-04-18 21:57:32 -07:00 committed by Greg KH
parent 6897089c5f
commit 31e5abe9a6
2 changed files with 42 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
fs/sysfs/file.c
View File

@ -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.

7
include/linux/sysfs.h
View File

@ -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)
{