Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  [PATCH] ext4: retry failed direct IO allocations
  ext4: Fix build warning in ext4_dirty_inode()
  ext4: drop ext4dev compat
  ext4: fix a BUG_ON crash by checking that page has buffers attached to it

fs/ext4/Kconfig

@@ -26,20 +26,6 @@ config EXT4_FS
 
 	  If unsure, say N.
 
-config EXT4DEV_COMPAT
-	bool "Enable ext4dev compatibility"
-	depends on EXT4_FS
-	help
-	  Starting with 2.6.28, the name of the ext4 filesystem was
-	  renamed from ext4dev to ext4.  Unfortunately there are some
-	  legacy userspace programs (such as klibc's fstype) have
-	  "ext4dev" hardcoded.
-
-	  To enable backwards compatibility so that systems that are
-	  still expecting to mount ext4 filesystems using ext4dev,
-	  choose Y here.   This feature will go away by 2.6.31, so
-	  please arrange to get your userspace programs fixed!
-
 config EXT4_FS_XATTR
 	bool "Ext4 extended attributes"
 	depends on EXT4_FS

fs/ext4/inode.c

@@ -1146,8 +1146,8 @@ static int check_block_validity(struct inode *inode, const char *msg,
 }
 
 /*
- * Return the number of dirty pages in the given inode starting at
- * page frame idx.
+ * Return the number of contiguous dirty pages in a given inode
+ * starting at page frame idx.
  */
 static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx,
 				    unsigned int max_pages)
@@ -1181,15 +1181,15 @@ static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx,
 				unlock_page(page);
 				break;
 			}
-			head = page_buffers(page);
-			bh = head;
-			do {
-				if (!buffer_delay(bh) &&
-				    !buffer_unwritten(bh)) {
-					done = 1;
-					break;
-				}
-			} while ((bh = bh->b_this_page) != head);
+			if (page_has_buffers(page)) {
+				bh = head = page_buffers(page);
+				do {
+					if (!buffer_delay(bh) &&
+					    !buffer_unwritten(bh))
+						done = 1;
+					bh = bh->b_this_page;
+				} while (!done && (bh != head));
+			}
 			unlock_page(page);
 			if (done)
 				break;
@@ -3378,6 +3378,7 @@ static ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
 	ssize_t ret;
 	int orphan = 0;
 	size_t count = iov_length(iov, nr_segs);
+	int retries = 0;
 
 	if (rw == WRITE) {
 		loff_t final_size = offset + count;
@@ -3400,9 +3401,12 @@ static ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
 		}
 	}
 
+retry:
 	ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
 				 offset, nr_segs,
 				 ext4_get_block, NULL);
+	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
+		goto retry;
 
 	if (orphan) {
 		int err;
@@ -5612,14 +5616,12 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode)
  */
 void ext4_dirty_inode(struct inode *inode)
 {
-	handle_t *current_handle = ext4_journal_current_handle();
 	handle_t *handle;
 
 	handle = ext4_journal_start(inode, 2);
 	if (IS_ERR(handle))
 		goto out;
 
-	jbd_debug(5, "marking dirty.  outer handle=%p\n", current_handle);
 	ext4_mark_inode_dirty(handle, inode);
 
 	ext4_journal_stop(handle);

fs/ext4/super.c

@@ -3966,27 +3966,6 @@ static struct file_system_type ext4_fs_type = {
 	.fs_flags	= FS_REQUIRES_DEV,
 };
 
-#ifdef CONFIG_EXT4DEV_COMPAT
-static int ext4dev_get_sb(struct file_system_type *fs_type, int flags,
-			  const char *dev_name, void *data,struct vfsmount *mnt)
-{
-	printk(KERN_WARNING "EXT4-fs (%s): Update your userspace programs "
-	       "to mount using ext4\n", dev_name);
-	printk(KERN_WARNING "EXT4-fs (%s): ext4dev backwards compatibility "
-	       "will go away by 2.6.31\n", dev_name);
-	return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
-}
-
-static struct file_system_type ext4dev_fs_type = {
-	.owner		= THIS_MODULE,
-	.name		= "ext4dev",
-	.get_sb		= ext4dev_get_sb,
-	.kill_sb	= kill_block_super,
-	.fs_flags	= FS_REQUIRES_DEV,
-};
-MODULE_ALIAS("ext4dev");
-#endif
-
 static int __init init_ext4_fs(void)
 {
 	int err;
@@ -4011,13 +3990,6 @@ static int __init init_ext4_fs(void)
 	err = register_filesystem(&ext4_fs_type);
 	if (err)
 		goto out;
-#ifdef CONFIG_EXT4DEV_COMPAT
-	err = register_filesystem(&ext4dev_fs_type);
-	if (err) {
-		unregister_filesystem(&ext4_fs_type);
-		goto out;
-	}
-#endif
 	return 0;
 out:
 	destroy_inodecache();
@@ -4036,9 +4008,6 @@ out4:
 static void __exit exit_ext4_fs(void)
 {
 	unregister_filesystem(&ext4_fs_type);
-#ifdef CONFIG_EXT4DEV_COMPAT
-	unregister_filesystem(&ext4dev_fs_type);
-#endif
 	destroy_inodecache();
 	exit_ext4_xattr();
 	exit_ext4_mballoc();