From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 19D7E6B0253 for ; Wed, 12 Oct 2016 18:50:30 -0400 (EDT) Received: by mail-pf0-f198.google.com with SMTP id 128so56222042pfz.1 for ; Wed, 12 Oct 2016 15:50:30 -0700 (PDT) Received: from mga11.intel.com (mga11.intel.com. [192.55.52.93]) by mx.google.com with ESMTPS id m6si9442179pab.331.2016.10.12.15.50.29 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 12 Oct 2016 15:50:29 -0700 (PDT) From: Ross Zwisler Subject: [PATCH v6 02/17] ext4: tell DAX the size of allocation holes Date: Wed, 12 Oct 2016 16:50:07 -0600 Message-Id: <20161012225022.15507-3-ross.zwisler@linux.intel.com> In-Reply-To: <20161012225022.15507-1-ross.zwisler@linux.intel.com> References: <20161012225022.15507-1-ross.zwisler@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: Ross Zwisler , Theodore Ts'o , Alexander Viro , Andreas Dilger , Andrew Morton , Christoph Hellwig , Dan Williams , Dave Chinner , Jan Kara , Matthew Wilcox , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-xfs@vger.kernel.org When DAX calls _ext4_get_block() and the file offset points to a hole we currently don't set bh->b_size. This is current worked around via buffer_size_valid() in fs/dax.c. _ext4_get_block() has the hole size information from ext4_map_blocks(), so populate bh->b_size so we can remove buffer_size_valid() in a later patch. Signed-off-by: Ross Zwisler Reviewed-by: Jan Kara --- fs/ext4/inode.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 0900cb4..9075fac 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -759,6 +759,9 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock, ext4_update_bh_state(bh, map.m_flags); bh->b_size = inode->i_sb->s_blocksize * map.m_len; ret = 0; + } else if (ret == 0) { + /* hole case, need to fill in bh->b_size */ + bh->b_size = inode->i_sb->s_blocksize * map.m_len; } return ret; } -- 2.9.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org