Add object list to inodes

This patch adds a list of arbitrary objects to inodes.

This is used by LITMUS^RT'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 88110fd0b282..d063db37db34 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -374,6 +374,8 @@ 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 dc0478c07b2a..ea7b14901884 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -591,6 +591,8 @@ is_uncached_acl(struct posix_acl *acl)
         return (long)acl & 1;
 }
 
+struct inode_obj_id_table;
+
 #define IOP_FASTPERM    0x0001
 #define IOP_LOOKUP      0x0002
 #define IOP_NOFOLLOW    0x0004
@@ -702,6 +704,9 @@ struct inode {
         struct fscrypt_info     *i_crypt_info;
 #endif
 
+        struct list_head        i_obj_list;
+        struct mutex            i_obj_mutex;
+
         void                    *i_private; /* fs or device private pointer */
 };