From: Andreas Dilger Subject: Re: ext3: bogus i_mode errors with 2.6.18.1 Date: Tue, 24 Oct 2006 14:27:16 -0600 Message-ID: <20061024202716.GX3509@schatzie.adilger.int> References: <20061023144556.GY22487@skl-net.de> <20061023164416.GM3509@schatzie.adilger.int> <20061023200242.GA5015@schatzie.adilger.int> <20061024091449.GZ22487@skl-net.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Theodore Ts'o , linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org, Eric Sandeen Return-path: Received: from mail.clusterfs.com ([206.168.112.78]:16267 "EHLO mail.clusterfs.com") by vger.kernel.org with ESMTP id S1030438AbWJXU1T (ORCPT ); Tue, 24 Oct 2006 16:27:19 -0400 To: Andre Noll Content-Disposition: inline In-Reply-To: <20061024091449.GZ22487@skl-net.de> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Oct 24, 2006 11:14 +0200, Andre Noll wrote: > On 14:02, Andreas Dilger wrote: > Something like the this? (only compile tested). And no, I do _not_ know, > what I'm doing ;) Don't worry, everyone starts out not knowing what they are doing. The ext3_free_blocks() part looks OK from a cursory review. > @@ -1372,12 +1370,24 @@ allocated: > in_range(ret_block, le32_to_cpu(gdp->bg_inode_table), > EXT3_SB(sb)->s_itb_per_group) || > in_range(ret_block + num - 1, le32_to_cpu(gdp->bg_inode_table), > + EXT3_SB(sb)->s_itb_per_group)) { > + int j; > + ext3_error(sb, __FUNCTION__, > "Allocating block in system zone - " > "blocks from "E3FSBLK", length %lu", > ret_block, num); > - > + /* Note: This will potentially use up one of the handle's > + * buffer credits. Normally we have way too many credits, > + * so that is OK. In _very_ rare cases it might not be OK. > + * We will trigger an assertion if we run out of credits, > + * and we will have to do a full fsck of the filesystem - > + * better than randomly corrupting filesystem metadata. > + */ > + j = find_next_usable_block(-1, gdp, EXT3_BLOCKS_PER_GROUP(sb)); I'm not sure why the "find_next_usable_block()" part is in here? At this point we KNOW that ret_block is not a block we should be allocating, yet it is marked free in the bitmap. So we should just mark the block(s) in-use in the bitmap and look for a different block(s). > + if (j >= 0) > + ext3_set_bit(j, gdp_bh->b_data); Note that we need to loop over "num" blocks and set any bits that should be set, as is done in the ext3_free_blocks() code. This function has changed since 2.4 in that it can now potentially allocate multiple blocks. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc.