Add object list to inodes

This patch adds a list of arbitrary objects to inodes.

This is used by Linux's locking API to attach lock objects to inodes
(which represent namespaces in Linux's locking API).

2 files changed, 7 insertions, 0 deletions

diff --git a/fs/inode.c b/fs/inode.c
index 00d5fc3b86e1..a80e3263f8f2 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -370,6 +370,8 @@ void inode_init_once(struct inode *inode)
 #ifdef CONFIG_FSNOTIFY
         INIT_HLIST_HEAD(&inode->i_fsnotify_marks);
 #endif
+        INIT_LIST_HEAD(&inode->i_obj_list);
+        mutex_init(&inode->i_obj_mutex);
 }
 EXPORT_SYMBOL(inode_init_once);
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 65c2be22b601..8a0ac17dc350 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -508,6 +508,7 @@ static inline int mapping_writably_mapped(struct address_space *mapping)
 
 struct posix_acl;
 #define ACL_NOT_CACHED ((void *)(-1))
+struct inode_obj_id_table;
 
 #define IOP_FASTPERM    0x0001
 #define IOP_LOOKUP      0x0002
@@ -606,6 +607,10 @@ struct inode {
 #ifdef CONFIG_IMA
         atomic_t                i_readcount; /* struct files open RO */
 #endif
+
+        struct list_head        i_obj_list;
+        struct mutex            i_obj_mutex;
+
         void                    *i_private; /* fs or device private pointer */
 };