NFS: Remove the redundant 'dirty' and 'commit' lists from nfs_inode

Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/inode.c

@@ -1149,14 +1149,11 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
 
 	inode_init_once(&nfsi->vfs_inode);
 	spin_lock_init(&nfsi->req_lock);
-	INIT_LIST_HEAD(&nfsi->dirty);
-	INIT_LIST_HEAD(&nfsi->commit);
 	INIT_LIST_HEAD(&nfsi->open_files);
 	INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
 	INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
 	INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
 	atomic_set(&nfsi->data_updates, 0);
-	nfsi->ndirty = 0;
 	nfsi->ncommit = 0;
 	nfsi->npages = 0;
 	nfs4_init_once(nfsi);

fs/nfs/write.c

@@ -459,7 +459,6 @@ nfs_mark_request_commit(struct nfs_page *req)
 	struct nfs_inode *nfsi = NFS_I(inode);
 
 	spin_lock(&nfsi->req_lock);
-	nfs_list_add_request(req, &nfsi->commit);
 	nfsi->ncommit++;
 	set_bit(PG_NEED_COMMIT, &(req)->wb_flags);
 	radix_tree_tag_set(&nfsi->nfs_page_tree,
@@ -581,8 +580,6 @@ nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, u
 		res = nfs_scan_list(nfsi, dst, idx_start, npages,
 				NFS_PAGE_TAG_COMMIT);
 		nfsi->ncommit -= res;
-		if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit))
-			printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n");
 	}
 	return res;
 }

include/linux/nfs_fs.h

@@ -156,12 +156,9 @@ struct nfs_inode {
 	 * This is the list of dirty unwritten pages.
 	 */
 	spinlock_t		req_lock;
-	struct list_head	dirty;
-	struct list_head	commit;
 	struct radix_tree_root	nfs_page_tree;
 
-	unsigned int		ndirty,
-				ncommit,
+	unsigned int		ncommit,
 				npages;
 
 	/* Open contexts for shared mmap writes */

include/linux/nfs_page.h

@@ -34,8 +34,7 @@
 
 struct nfs_inode;
 struct nfs_page {
-	struct list_head	wb_list,	/* Defines state of page: */
-				*wb_list_head;	/*      read/write/commit */
+	struct list_head	wb_list;	/* Defines state of page: */
 	struct page		*wb_page;	/* page to read in/write out */
 	struct nfs_open_context	*wb_context;	/* File state context info */
 	atomic_t		wb_complete;	/* i/os we're waiting for */
@@ -118,7 +117,6 @@ static inline void
 nfs_list_add_request(struct nfs_page *req, struct list_head *head)
 {
 	list_add_tail(&req->wb_list, head);
-	req->wb_list_head = head;
 }
 
 
@@ -132,7 +130,6 @@ nfs_list_remove_request(struct nfs_page *req)
 	if (list_empty(&req->wb_list))
 		return;
 	list_del_init(&req->wb_list);
-	req->wb_list_head = NULL;
 }
 
 static inline struct nfs_page *