[PATCH] ext3: fix nobh mode for chattr +j inodes

One can do "chattr +j" on a file to change its journalling mode.  Fix
writeback mode with "nobh" handling for it.

Even though, we mount ext3 filesystem in writeback mode with "nobh" option,
some one can do "chattr +j" on a single file to force it to do journalled
mode.  In order to do journaling, ext3_block_truncate_page() need to
fallback to default case of creating buffers and adding them to transaction
etc.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 3fc4238e9703dca7b67b3fe9f81a221376901e45..0384e539b88f47a18c32c0b6dce63c8f0e4558e0 100644 (file)
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1624,15 +1624,14 @@ static int ext3_block_truncate_page(handle_t *handle, struct page *page,
         * For "nobh" option,  we can only work if we don't need to
         * read-in the page - otherwise we create buffers to do the IO.
         */
-       if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH)) {
-               if (PageUptodate(page)) {
-                       kaddr = kmap_atomic(page, KM_USER0);
-                       memset(kaddr + offset, 0, length);
-                       flush_dcache_page(page);
-                       kunmap_atomic(kaddr, KM_USER0);
-                       set_page_dirty(page);
-                       goto unlock;
-               }
+       if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
+            ext3_should_writeback_data(inode) && PageUptodate(page)) {
+               kaddr = kmap_atomic(page, KM_USER0);
+               memset(kaddr + offset, 0, length);
+               flush_dcache_page(page);
+               kunmap_atomic(kaddr, KM_USER0);
+               set_page_dirty(page);
+               goto unlock;
        }
 
        if (!page_has_buffers(page))