configfs: add show and store methods to struct configfs_attribute
Add methods to struct configfs_attribute to directly show and store
attributes without adding boilerplate code to every user. In addition
to the methods this also adds 3 helper macros to define read/write,
read-only and write-only attributes with a single line of code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/fs/configfs/file.c b/fs/configfs/file.c
index 403269f..106ca58 100644
--- a/fs/configfs/file.c
+++ b/fs/configfs/file.c
@@ -74,7 +74,11 @@
if (!buffer->page)
return -ENOMEM;
- count = ops->show_attribute(item,attr,buffer->page);
+ if (ops->show_attribute)
+ count = ops->show_attribute(item, attr, buffer->page);
+ else
+ count = attr->show(item, buffer->page);
+
buffer->needs_read_fill = 0;
BUG_ON(count > (ssize_t)SIMPLE_ATTR_SIZE);
if (count >= 0)
@@ -173,7 +177,9 @@
struct config_item * item = to_item(dentry->d_parent);
struct configfs_item_operations * ops = buffer->ops;
- return ops->store_attribute(item,attr,buffer->page,count);
+ if (ops->store_attribute)
+ return ops->store_attribute(item, attr, buffer->page, count);
+ return attr->store(item, buffer->page, count);
}
@@ -237,8 +243,8 @@
* and we must have a store method.
*/
if (file->f_mode & FMODE_WRITE) {
-
- if (!(inode->i_mode & S_IWUGO) || !ops->store_attribute)
+ if (!(inode->i_mode & S_IWUGO) ||
+ (!ops->store_attribute && !attr->store))
goto Eaccess;
}
@@ -248,7 +254,8 @@
* must be a show method for it.
*/
if (file->f_mode & FMODE_READ) {
- if (!(inode->i_mode & S_IRUGO) || !ops->show_attribute)
+ if (!(inode->i_mode & S_IRUGO) ||
+ (!ops->show_attribute && !attr->show))
goto Eaccess;
}