From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp08.in.ibm.com ([122.248.162.8]:44503 "EHLO e28smtp08.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753034AbaIHOPC (ORCPT ); Mon, 8 Sep 2014 10:15:02 -0400 Received: from /spool/local by e28smtp08.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 8 Sep 2014 19:44:59 +0530 Received: from d28relay03.in.ibm.com (d28relay03.in.ibm.com [9.184.220.60]) by d28dlp02.in.ibm.com (Postfix) with ESMTP id 4A3723940045 for ; Mon, 8 Sep 2014 19:44:58 +0530 (IST) Received: from d28av05.in.ibm.com (d28av05.in.ibm.com [9.184.220.67]) by d28relay03.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id s88EHJ7n3146012 for ; Mon, 8 Sep 2014 19:47:19 +0530 Received: from d28av05.in.ibm.com (localhost [127.0.0.1]) by d28av05.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s88EEu9X021959 for ; Mon, 8 Sep 2014 19:44:57 +0530 From: Chandan Rajendra To: clm@fb.com, jbacik@fb.com, bo.li.liu@oracle.com, dsterba@suse.cz Cc: Chandan Rajendra , aneesh.kumar@linux.vnet.ibm.com, linux-btrfs@vger.kernel.org Subject: [RFC PATCH V6 00/15] ] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O. Date: Mon, 8 Sep 2014 19:44:11 +0530 Message-Id: <1410185666-23308-1-git-send-email-chandan@linux.vnet.ibm.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: This patchset continues with the work posted earlier at https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg35926.html. Changes from V1: 1. Remove usage of bio_vec->bv_{len,offset} in end_bio_extent_readpage() and end_bio_extent_writepage(). Changes from V2: 1. Get __extent_writepage() to write only the dirty blocks of a page. 2. Fix "page private not zero on page" warning message which is printed when running xfstests. Changes from V3: 1. Get "Hole punching" and "Extent preallocation" to work correctly in subpagesize-blocksize scenario. 2. Get btrfs_page_mkwrite() to reserve space in sectorsized units. Changes from V4: 1. V2's "Btrfs: subpagesize-blocksize: Get rid of whole page reads" patch was incorrectly replaced with an older version when working on V3 patches. Fix this. 2. Fix btrfs_endio_direct_read() to compute checksums for all possible blocks in a page. Changes from V5: 1. Rebased patchset on top of current btrfs-next tree (i.e. commit 8d875f95da43c6a8f18f77869f2ef26e9594fecc). This involved using "immutable biovecs". 2. Deal with partially allocated ordered extents across a page. 3. Explicitly track I/O status of blocks of an ordered extent. Xfstests' generic tests were run on an x86_64 machine with the patches applied. The Btrfs kernel module was compiled without ACL and quotas support and hence tests related to those were not run. On multiple runs of the tests with 4k blocksize, 'umount' process would sometimes get blocked indefinitely causing 'hung task detector' to print the function call trace. For 2k blocksize, the following xfstests' generic tests failed: 091, 125, 127, 224, 263, 274. The following is a list of known TODO items which will be implemented in future revisions of this patchset: 1. Get Xfstests' generic tests to successfully run on both 4k and 2k blocksizes. 2. Remove PAGE_CACHE_SIZE delalloc reservation in btrfs_writepage_fixup_worker(). 3. Create separate slab caches for 'extent buffer head' and 'extent buffer'. 4. Add 'leak list' tracking for 'extent buffer' instances. 5. Rename EXTENT_BUFFER_TREE_REF and EXTENT_BUFFER_IN_TREE to EXTENT_BUFFER_HEAD_TREE_REF and EXTENT_BUFFER_HEAD_IN_TREE respectively. Chandan Rajendra (13): Btrfs: subpagesize-blocksize: Get rid of whole page reads. Btrfs: subpagesize-blocksize: Get rid of whole page writes. Btrfs: subpagesize-blocksize: __btrfs_buffered_write: Reserve/release extents aligned to block size. Btrfs: subpagesize-blocksize: Read tree blocks whose size is