X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fs%2Fsysfs%2Ffile.c;h=364208071e1747d155b3eb6521d364c30b53bcd5;hb=f7f1b0f1e2fbadeab12d24236000e778aa9b1ead;hp=352f966a1174681f0c1e6a5801942b16d8df7d40;hpb=e3f6fb6212a7102bdb56ba38fa1e98fe72950475;p=linux-2.6.git

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 352f966a1..364208071 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -96,7 +96,7 @@ static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer
 /**
  *	flush_read_buffer - push buffer to userspace.
  *	@buffer:	data buffer for file.
- *	@userbuf:	user-passed buffer.
+ *	@buf:		user-passed buffer.
  *	@count:		number of bytes requested.
  *	@ppos:		file position.
  *
@@ -164,7 +164,7 @@ out:
 /**
  *	fill_write_buffer - copy buffer from userspace.
  *	@buffer:	data buffer for file.
- *	@userbuf:	data from user.
+ *	@buf:		data from user.
  *	@count:		number of bytes in @userbuf.
  *
  *	Allocate @buffer->page if it hasn't been already, then
@@ -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.