From patchwork Tue Dec 19 10:02:44 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Timofey Titovets X-Patchwork-Id: 10122901 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8E0B36019C for ; Tue, 19 Dec 2017 10:03:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7D9122905F for ; Tue, 19 Dec 2017 10:03:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 727D6290FB; Tue, 19 Dec 2017 10:03:05 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B80892905F for ; Tue, 19 Dec 2017 10:03:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761704AbdLSKDD (ORCPT ); Tue, 19 Dec 2017 05:03:03 -0500 Received: from mail-wm0-f65.google.com ([74.125.82.65]:37174 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760214AbdLSKC6 (ORCPT ); Tue, 19 Dec 2017 05:02:58 -0500 Received: by mail-wm0-f65.google.com with SMTP id f140so2365139wmd.2 for ; Tue, 19 Dec 2017 02:02:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=kz4v3o+dKTfo2w4lAaxikXc2k4I0Wy56fsIfeW7YSIo=; b=aZeZ8hZAn6wjz09CqHmljxHP8uUMjmuo8Fmyo66ZAAZctODk8l5+8wv5CUAVskHxxm LnMNnnkVTt4sqVSiihkfnSB/YlgWupeNFm1tBTDthTOGTP6QgbEo0rgblLlAHjhJ4+Wb p2ENa+B2WPbTwkA/pX2y/s9GUsidJaHKLiqNnK6YYON2CLXPo76tsbzR511OVudaqWgo 4RpPzp3uwTihDLwsJ7UNPmTfKdr+3OOeMqAjO7pclLo+L/CCJRcMOWMOqwQH0+4M+qNN g+U7n9CN7WUBU+wA50MEhsQjLQJ82OKlGpIqX9GRMj4Wji9Upt69vRP+1fUlLQIMJnhM bekQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=kz4v3o+dKTfo2w4lAaxikXc2k4I0Wy56fsIfeW7YSIo=; b=jFVZuGUsfluGhE7LYnWP2m6fezYvBCWKQLtGBUq0EYns/DWrKoJDiuMIMEvx+c/QEw 3PAKbbDyHO8rxQ2bjkHfzMk4XA0+kF0Z2ceSMG2na5vWU4Js/Pt985Ht4YPrIkE0B4U/ WOSujkska6krGsnTCBSh3W8/6WeNM2N/bSZx08d4+ey4nGmQn+R7Kd3vOZLX1PI8gbUP fxU162MwLXTcPUCWf4KvveuWaC2mv6n/Caw9e5gFhAnMJwMxQC+4awXCJqGhLCXMrK3g 8wFeYTxqiuJ5wVaLDeSV7pl0D0prABwdzrn++JI5h8wlmsmN8noIiPpdkWB0FYSAHgXw nU6w== X-Gm-Message-State: AKGB3mJTCCSkoKSNMCOnjwxZS6Xt5GK97DPGe9xHiQm+75Fx5xofTM0x fBIiTIvIzULxSY1zfs4hTUQBBQ== X-Google-Smtp-Source: ACJfBotJ+GJgODBw3P41gzqQBi8ndhqkjUZS6/fmXjgboSlCeKGLz2t9OkJZw/JT4mS3kOBCPXgfQQ== X-Received: by 10.28.227.136 with SMTP id a130mr3143750wmh.104.1513677776859; Tue, 19 Dec 2017 02:02:56 -0800 (PST) Received: from titovetst-beplan.itransition.corp ([93.171.6.182]) by smtp.gmail.com with ESMTPSA id s70sm1404372wma.37.2017.12.19.02.02.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Dec 2017 02:02:56 -0800 (PST) From: Timofey Titovets To: linux-btrfs@vger.kernel.org Cc: Timofey Titovets Subject: [PATCH 1/4] Btrfs: btrfs_dedupe_file_range() ioctl, remove 16MiB restriction Date: Tue, 19 Dec 2017 13:02:44 +0300 Message-Id: <20171219100247.13880-2-nefelim4ag@gmail.com> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171219100247.13880-1-nefelim4ag@gmail.com> References: <20171219100247.13880-1-nefelim4ag@gmail.com> Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP At now btrfs_dedupe_file_range() restricted to 16MiB range for limit locking time and memory requirement for dedup ioctl() For too big input range code silently set range to 16MiB Let's remove that restriction by do iterating over dedup range. That's backward compatible and will not change anything for request less then 16MiB. Changes: v1 -> v2: - Refactor btrfs_cmp_data_prepare and btrfs_extent_same - Store memory of pages array between iterations - Lock inodes once, not on each iteration - Small inplace cleanups Signed-off-by: Timofey Titovets --- fs/btrfs/ioctl.c | 160 ++++++++++++++++++++++++++++++++----------------------- 1 file changed, 94 insertions(+), 66 deletions(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index be5bd81b3669..45a47d0891fc 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2965,8 +2965,8 @@ static void btrfs_cmp_data_free(struct cmp_pages *cmp) put_page(pg); } } - kfree(cmp->src_pages); - kfree(cmp->dst_pages); + + cmp->num_pages = 0; } static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, @@ -2974,41 +2974,22 @@ static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, u64 len, struct cmp_pages *cmp) { int ret; - int num_pages = PAGE_ALIGN(len) >> PAGE_SHIFT; - struct page **src_pgarr, **dst_pgarr; - - /* - * We must gather up all the pages before we initiate our - * extent locking. We use an array for the page pointers. Size - * of the array is bounded by len, which is in turn bounded by - * BTRFS_MAX_DEDUPE_LEN. - */ - src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); - dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); - if (!src_pgarr || !dst_pgarr) { - kfree(src_pgarr); - kfree(dst_pgarr); - return -ENOMEM; - } - cmp->num_pages = num_pages; - cmp->src_pages = src_pgarr; - cmp->dst_pages = dst_pgarr; /* * If deduping ranges in the same inode, locking rules make it mandatory * to always lock pages in ascending order to avoid deadlocks with * concurrent tasks (such as starting writeback/delalloc). */ - if (src == dst && dst_loff < loff) { - swap(src_pgarr, dst_pgarr); + if (src == dst && dst_loff < loff) swap(loff, dst_loff); - } - ret = gather_extent_pages(src, src_pgarr, cmp->num_pages, loff); + cmp->num_pages = PAGE_ALIGN(len) >> PAGE_SHIFT; + + ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff); if (ret) goto out; - ret = gather_extent_pages(dst, dst_pgarr, cmp->num_pages, dst_loff); + ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff); out: if (ret) @@ -3078,31 +3059,23 @@ static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen, return 0; } -static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, - struct inode *dst, u64 dst_loff) +static int __btrfs_extent_same(struct inode *src, u64 loff, u64 olen, + struct inode *dst, u64 dst_loff, + struct cmp_pages *cmp) { int ret; u64 len = olen; - struct cmp_pages cmp; bool same_inode = (src == dst); u64 same_lock_start = 0; u64 same_lock_len = 0; - if (len == 0) - return 0; - - if (same_inode) - inode_lock(src); - else - btrfs_double_inode_lock(src, dst); - ret = extent_same_check_offsets(src, loff, &len, olen); if (ret) - goto out_unlock; + return ret; ret = extent_same_check_offsets(dst, dst_loff, &len, olen); if (ret) - goto out_unlock; + return ret; if (same_inode) { /* @@ -3119,32 +3092,21 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, * allow an unaligned length so long as it ends at * i_size. */ - if (len != olen) { - ret = -EINVAL; - goto out_unlock; - } + if (len != olen) + return -EINVAL; /* Check for overlapping ranges */ - if (dst_loff + len > loff && dst_loff < loff + len) { - ret = -EINVAL; - goto out_unlock; - } + if (dst_loff + len > loff && dst_loff < loff + len) + return -EINVAL; same_lock_start = min_t(u64, loff, dst_loff); same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start; } - /* don't make the dst file partly checksummed */ - if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != - (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { - ret = -EINVAL; - goto out_unlock; - } - again: - ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp); + ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, cmp); if (ret) - goto out_unlock; + return ret; if (same_inode) ret = lock_extent_range(src, same_lock_start, same_lock_len, @@ -3165,7 +3127,7 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, * Ranges in the io trees already unlocked. Now unlock all * pages before waiting for all IO to complete. */ - btrfs_cmp_data_free(&cmp); + btrfs_cmp_data_free(cmp); if (same_inode) { btrfs_wait_ordered_range(src, same_lock_start, same_lock_len); @@ -3178,12 +3140,12 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, ASSERT(ret == 0); if (WARN_ON(ret)) { /* ranges in the io trees already unlocked */ - btrfs_cmp_data_free(&cmp); + btrfs_cmp_data_free(cmp); return ret; } /* pass original length for comparison so we stay within i_size */ - ret = btrfs_cmp_data(olen, &cmp); + ret = btrfs_cmp_data(olen, cmp); if (ret == 0) ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); @@ -3193,8 +3155,79 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, else btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); - btrfs_cmp_data_free(&cmp); -out_unlock: + btrfs_cmp_data_free(cmp); + + return ret; +} + +#define BTRFS_MAX_DEDUPE_LEN SZ_16M + +static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, + struct inode *dst, u64 dst_loff) +{ + int ret; + int num_pages; + bool same_inode = (src == dst); + u64 i, tail_len, chunk_count; + struct cmp_pages cmp; + + if (olen == 0) + return 0; + + /* don't make the dst file partly checksummed */ + if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != + (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { + return -EINVAL; + } + + if (same_inode) + inode_lock(src); + else + btrfs_double_inode_lock(src, dst); + + tail_len = olen % BTRFS_MAX_DEDUPE_LEN; + chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN); + + if (chunk_count > 0) { + num_pages = PAGE_ALIGN(BTRFS_MAX_DEDUPE_LEN) >> PAGE_SHIFT; + } else { + num_pages = PAGE_ALIGN(tail_len) >> PAGE_SHIFT; + } + /* + * We must gather up all the pages before we initiate our + * extent locking. We use an array for the page pointers. Size + * of the array is bounded by len, which is in turn bounded by + * BTRFS_MAX_DEDUPE_LEN. + */ + ret = -ENOMEM; + cmp.src_pages = kcalloc(num_pages, sizeof(struct page *), + GFP_KERNEL); + if (!cmp.src_pages) + goto out; + cmp.dst_pages = kcalloc(num_pages, sizeof(struct page *), + GFP_KERNEL); + if (!cmp.dst_pages) + goto out; + + + for (i = 0; i < chunk_count; i++) { + ret = __btrfs_extent_same(src, loff, BTRFS_MAX_DEDUPE_LEN, + dst, dst_loff, &cmp); + if (ret) + goto out; + + loff += BTRFS_MAX_DEDUPE_LEN; + dst_loff += BTRFS_MAX_DEDUPE_LEN; + } + + if (tail_len > 0) + ret = __btrfs_extent_same(src, loff, tail_len, + dst, dst_loff, &cmp); + +out: + kfree(cmp.src_pages); + kfree(cmp.dst_pages); + if (same_inode) inode_unlock(src); else @@ -3203,8 +3236,6 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, return ret; } -#define BTRFS_MAX_DEDUPE_LEN SZ_16M - ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, struct file *dst_file, u64 dst_loff) { @@ -3213,9 +3244,6 @@ ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; ssize_t res; - if (olen > BTRFS_MAX_DEDUPE_LEN) - olen = BTRFS_MAX_DEDUPE_LEN; - if (WARN_ON_ONCE(bs < PAGE_SIZE)) { /* * Btrfs does not support blocksize < page_size. As a