[PATCH 1/6] vfs: add per-sb auxiliary inode attribute table

[Dmitry Monakhov <dmonakhov@openvz.org>]

Some times it is useful to export non standard attributes
to generic vfs layer, but it is too expansive to store it
inside vfs inode. Let's introduce generic interface for this
purpose. One may declare an attribute and filesystem provides
access to it, if necessery.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
---
 include/linux/fs.h |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index b1bcb27..c510ef7 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -384,6 +384,7 @@ struct inodes_stat_t {
 #include <asm/byteorder.h>
 
 struct export_operations;
+struct aux_attributes;
 struct hd_geometry;
 struct iovec;
 struct nameidata;
@@ -1323,6 +1324,7 @@ struct super_block {
 	const struct dquot_operations	*dq_op;
 	const struct quotactl_ops	*s_qcop;
 	const struct export_operations *s_export_op;
+	const struct aux_attributes *s_aux_attr;
 	unsigned long		s_flags;
 	unsigned long		s_magic;
 	struct dentry		*s_root;
@@ -1576,7 +1578,10 @@ struct super_operations {
 #endif
 	int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
 };
-
+struct aux_attributes
+{
+	int supported;
+};
 /*
  * Inode state bits.  Protected by inode_lock.
  *
-- 
1.6.6