[PATCH] bdev: add file.f_mapping

From: viro@parcelfarce.linux.theplanet.co.uk <viro@parcelfarce.linux.theplanet.co.uk>

New field of struct file - ->f_mapping.  We maintain the following:
file->f_dentry->d_inode->i_mapping == file->f_mapping for all opened files.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index ab962f0b00c2..5848fcb8b351 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -526,6 +526,7 @@ struct file {
 	/* Used by fs/eventpoll.c to link all the hooks to this file */
 	struct list_head	f_ep_links;
 	spinlock_t		f_ep_lock;
+	struct address_space	*f_mapping;
 };
 extern spinlock_t files_lock;
 #define file_list_lock() spin_lock(&files_lock);