[PATCH v4 4/4] vfs: fs_may_remount_ro: turn unnecessary check into a WARN_ON

[Miklos Szeredi <miklos@szeredi.hu>]

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From: Miklos Szeredi <mszeredi@suse.cz>

Now a successful sb_prepare_remount_readonly() should ensure that no
writable files remain for this superblock.  So turn this check into a
WARN_ON.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
 fs/file_table.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: linux-2.6/fs/file_table.c
===================================================================
--- linux-2.6.orig/fs/file_table.c	2011-01-18 09:01:20.000000000 +0100
+++ linux-2.6/fs/file_table.c	2011-01-18 12:39:21.000000000 +0100
@@ -436,8 +436,11 @@ int fs_may_remount_ro(struct super_block
 		if (inode->i_nlink == 0)
 			goto too_bad;
 
-		/* Writeable file? */
-		if (S_ISREG(inode->i_mode) && (file->f_mode & FMODE_WRITE))
+		/*
+		 * Writable file?
+		 * Should be caught by sb_prepare_remount_readonly().
+		 */
+		if (WARN_ON(S_ISREG(inode->i_mode) && (file->f_mode & FMODE_WRITE)))
 			goto too_bad;
 	} while_file_list_for_each_entry;
 	lg_global_unlock(files_lglock);

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