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Subject[patch 15/23] ext3 -nobh option causes oops
-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Badari Pulavarty <pbadari@us.ibm.com>

For files other than IFREG, nobh option doesn't make sense. Modifications
to them are journalled and needs buffer heads to do that. Without this
patch, we get kernel oops in page_buffers().

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
fs/ext3/inode.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- linux-2.6.17.7.orig/fs/ext3/inode.c
+++ linux-2.6.17.7/fs/ext3/inode.c
@@ -1159,7 +1159,7 @@ retry:
ret = PTR_ERR(handle);
goto out;
}
- if (test_opt(inode->i_sb, NOBH))
+ if (test_opt(inode->i_sb, NOBH) && ext3_should_writeback_data(inode))
ret = nobh_prepare_write(page, from, to, ext3_get_block);
else
ret = block_prepare_write(page, from, to, ext3_get_block);
@@ -1245,7 +1245,7 @@ static int ext3_writeback_commit_write(s
if (new_i_size > EXT3_I(inode)->i_disksize)
EXT3_I(inode)->i_disksize = new_i_size;

- if (test_opt(inode->i_sb, NOBH))
+ if (test_opt(inode->i_sb, NOBH) && ext3_should_writeback_data(inode))
ret = nobh_commit_write(file, page, from, to);
else
ret = generic_commit_write(file, page, from, to);
@@ -1495,7 +1495,7 @@ static int ext3_writeback_writepage(stru
goto out_fail;
}

- if (test_opt(inode->i_sb, NOBH))
+ if (test_opt(inode->i_sb, NOBH) && ext3_should_writeback_data(inode))
ret = nobh_writepage(page, ext3_get_block, wbc);
else
ret = block_write_full_page(page, ext3_get_block, wbc);
--
-
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