From patchwork Fri Aug 7 07:05:48 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 6965251 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A91A69F358 for ; Fri, 7 Aug 2015 07:07:36 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A644B20666 for ; Fri, 7 Aug 2015 07:07:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86D2820670 for ; Fri, 7 Aug 2015 07:07:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754930AbbHGHH1 (ORCPT ); Fri, 7 Aug 2015 03:07:27 -0400 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:38004 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754116AbbHGHHV (ORCPT ); Fri, 7 Aug 2015 03:07:21 -0400 Received: from /spool/local by e23smtp06.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 7 Aug 2015 17:07:16 +1000 X-Helo: d23dlp03.au.ibm.com X-MailFrom: chandan@linux.vnet.ibm.com X-RcptTo: linux-btrfs@vger.kernel.org Received: from d23relay08.au.ibm.com (d23relay08.au.ibm.com [9.185.71.33]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 2540D357805B for ; Fri, 7 Aug 2015 17:07:16 +1000 (EST) Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay08.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t77773Ag59506908 for ; Fri, 7 Aug 2015 17:07:11 +1000 Received: from d23av02.au.ibm.com (localhost [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t7776hnH031668 for ; Fri, 7 Aug 2015 17:06:43 +1000 Received: from localhost.in.ibm.com ([9.124.35.223]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id t7776ds4031165; Fri, 7 Aug 2015 17:06:41 +1000 From: Chandan Rajendra To: linux-btrfs@vger.kernel.org Cc: Chandan Rajendra , clm@fb.com, jbacik@fb.com, bo.li.liu@oracle.com, dsterba@suse.cz, chandan@mykolab.com, quwenruo@cn.fujitsu.com Subject: [PATCH V2 01/11] Btrfs: __btrfs_buffered_write: Reserve/release extents aligned to block size Date: Fri, 7 Aug 2015 12:35:48 +0530 Message-Id: <1438931158-20888-2-git-send-email-chandan@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1438931158-20888-1-git-send-email-chandan@linux.vnet.ibm.com> References: <1438931158-20888-1-git-send-email-chandan@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15080707-0021-0000-0000-000001AF6959 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently, the code reserves/releases extents in multiples of PAGE_CACHE_SIZE units. Fix this by doing reservation/releases in block size units. Signed-off-by: Chandan Rajendra --- fs/btrfs/file.c | 44 +++++++++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 13 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 795d754..78dc4b2 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -499,7 +499,7 @@ int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, loff_t isize = i_size_read(inode); start_pos = pos & ~((u64)root->sectorsize - 1); - num_bytes = ALIGN(write_bytes + pos - start_pos, root->sectorsize); + num_bytes = round_up(write_bytes + pos - start_pos, root->sectorsize); end_of_last_block = start_pos + num_bytes - 1; err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block, @@ -1362,16 +1362,19 @@ fail: static noinline int lock_and_cleanup_extent_if_need(struct inode *inode, struct page **pages, size_t num_pages, loff_t pos, + size_t write_bytes, u64 *lockstart, u64 *lockend, struct extent_state **cached_state) { + struct btrfs_root *root = BTRFS_I(inode)->root; u64 start_pos; u64 last_pos; int i; int ret = 0; - start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); - last_pos = start_pos + ((u64)num_pages << PAGE_CACHE_SHIFT) - 1; + start_pos = round_down(pos, root->sectorsize); + last_pos = start_pos + + round_up(pos + write_bytes - start_pos, root->sectorsize) - 1; if (start_pos < inode->i_size) { struct btrfs_ordered_extent *ordered; @@ -1489,6 +1492,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, while (iov_iter_count(i) > 0) { size_t offset = pos & (PAGE_CACHE_SIZE - 1); + size_t sector_offset; size_t write_bytes = min(iov_iter_count(i), nrptrs * (size_t)PAGE_CACHE_SIZE - offset); @@ -1497,6 +1501,8 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, size_t reserve_bytes; size_t dirty_pages; size_t copied; + size_t dirty_sectors; + size_t num_sectors; WARN_ON(num_pages > nrptrs); @@ -1509,8 +1515,12 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, break; } - reserve_bytes = num_pages << PAGE_CACHE_SHIFT; + sector_offset = pos & (root->sectorsize - 1); + reserve_bytes = round_up(write_bytes + sector_offset, + root->sectorsize); + ret = btrfs_check_data_free_space(inode, reserve_bytes, write_bytes); + if (ret == -ENOSPC && (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | BTRFS_INODE_PREALLOC))) { @@ -1523,7 +1533,10 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, */ num_pages = DIV_ROUND_UP(write_bytes + offset, PAGE_CACHE_SIZE); - reserve_bytes = num_pages << PAGE_CACHE_SHIFT; + reserve_bytes = round_up(write_bytes + + sector_offset, + root->sectorsize); + ret = 0; } else { ret = -ENOSPC; @@ -1558,8 +1571,8 @@ again: break; ret = lock_and_cleanup_extent_if_need(inode, pages, num_pages, - pos, &lockstart, &lockend, - &cached_state); + pos, write_bytes, &lockstart, + &lockend, &cached_state); if (ret < 0) { if (ret == -EAGAIN) goto again; @@ -1595,9 +1608,14 @@ again: * we still have an outstanding extent for the chunk we actually * managed to copy. */ - if (num_pages > dirty_pages) { - release_bytes = (num_pages - dirty_pages) << - PAGE_CACHE_SHIFT; + num_sectors = reserve_bytes >> inode->i_blkbits; + dirty_sectors = round_up(copied + sector_offset, + root->sectorsize); + dirty_sectors >>= inode->i_blkbits; + + if (num_sectors > dirty_sectors) { + release_bytes = (write_bytes - copied) + & ~((u64)root->sectorsize - 1); if (copied > 0) { spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->outstanding_extents++; @@ -1611,7 +1629,8 @@ again: release_bytes); } - release_bytes = dirty_pages << PAGE_CACHE_SHIFT; + release_bytes = round_up(copied + sector_offset, + root->sectorsize); if (copied > 0) ret = btrfs_dirty_pages(root, inode, pages, @@ -1632,8 +1651,7 @@ again: if (only_release_metadata && copied > 0) { lockstart = round_down(pos, root->sectorsize); - lockend = lockstart + - (dirty_pages << PAGE_CACHE_SHIFT) - 1; + lockend = round_up(pos + copied, root->sectorsize) - 1; set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, EXTENT_NORESERVE, NULL,