From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 013FCC4346E for ; Tue, 29 Sep 2020 08:23:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CE0E20773 for ; Tue, 29 Sep 2020 08:23:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601367789; bh=7luurs8JgQnoP9+X7r6HhLN7YjvPLnF20aYzggoZCzs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=Lf3+GgZMwLdvX1IJDFzPtH2JtU7hZXW8QLZOFjwwNOUi/0jSuqsSb5FC/zl4/9Hwj 33vezNf/crq3CQjSaINBLegXziJsnosi34GV1pYhssywMJUsmzfgVl2UCE5H/vAXPT flDKlyPp2urRBebqV4u2E5527T5WV7TNlfduWlQ8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727591AbgI2IXI (ORCPT ); Tue, 29 Sep 2020 04:23:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:35492 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725283AbgI2IXH (ORCPT ); Tue, 29 Sep 2020 04:23:07 -0400 Received: from localhost (unknown [104.132.1.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C655220739; Tue, 29 Sep 2020 08:23:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601367786; bh=7luurs8JgQnoP9+X7r6HhLN7YjvPLnF20aYzggoZCzs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=K8uysvlQ+a1GVqssPt4pk8Te4CCtzqs6uhFfWeT4/L8ymgBF6Je7VCOGFX2InHvoT wArmBik7TMFnLQ0RwaECkDGNnLhvOARD6pwMWI3tM3czOnTBltrgnF+T0M7YoC2+K8 YWFZWWunsscjEqbNF3xahFoU3gY1mVw6EbcBh0VQ= Date: Tue, 29 Sep 2020 01:23:06 -0700 From: Jaegeuk Kim To: Chao Yu Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, chao@kernel.org Subject: Re: [PATCH v2 1/2] f2fs: compress: introduce page array slab cache Message-ID: <20200929082306.GA1567825@google.com> References: <20200914090514.50102-1-yuchao0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200914090514.50102-1-yuchao0@huawei.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I found a bug related to the number of page pointer allocation related to nr_cpages. diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index f086ac43ca825..3a18666725fef 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -20,22 +20,20 @@ static struct kmem_cache *cic_entry_slab; static struct kmem_cache *dic_entry_slab; -static void *page_array_alloc(struct inode *inode) +static void *page_array_alloc(struct inode *inode, int nr) { struct f2fs_sb_info *sbi = F2FS_I_SB(inode); - unsigned int size = sizeof(struct page *) << - F2FS_I(inode)->i_log_cluster_size; + unsigned int size = sizeof(struct page *) * nr; if (likely(size == sbi->page_array_slab_size)) return kmem_cache_zalloc(sbi->page_array_slab, GFP_NOFS); return f2fs_kzalloc(sbi, size, GFP_NOFS); } -static void page_array_free(struct inode *inode, void *pages) +static void page_array_free(struct inode *inode, void *pages, int nr) { struct f2fs_sb_info *sbi = F2FS_I_SB(inode); - unsigned int size = sizeof(struct page *) << - F2FS_I(inode)->i_log_cluster_size; + unsigned int size = sizeof(struct page *) * nr; if (!pages) return; @@ -162,13 +160,13 @@ int f2fs_init_compress_ctx(struct compress_ctx *cc) if (cc->rpages) return 0; - cc->rpages = page_array_alloc(cc->inode); + cc->rpages = page_array_alloc(cc->inode, cc->cluster_size); return cc->rpages ? 0 : -ENOMEM; } void f2fs_destroy_compress_ctx(struct compress_ctx *cc) { - page_array_free(cc->inode, cc->rpages); + page_array_free(cc->inode, cc->rpages, cc->cluster_size); cc->rpages = NULL; cc->nr_rpages = 0; cc->nr_cpages = 0; @@ -602,7 +600,8 @@ static int f2fs_compress_pages(struct compress_ctx *cc) struct f2fs_inode_info *fi = F2FS_I(cc->inode); const struct f2fs_compress_ops *cops = f2fs_cops[fi->i_compress_algorithm]; - unsigned int max_len, nr_cpages; + unsigned int max_len, new_nr_cpages; + struct page **new_cpages; int i, ret; trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx, @@ -617,7 +616,7 @@ static int f2fs_compress_pages(struct compress_ctx *cc) max_len = COMPRESS_HEADER_SIZE + cc->clen; cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE); - cc->cpages = page_array_alloc(cc->inode); + cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages); if (!cc->cpages) { ret = -ENOMEM; goto destroy_compress_ctx; @@ -659,16 +658,28 @@ static int f2fs_compress_pages(struct compress_ctx *cc) for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++) cc->cbuf->reserved[i] = cpu_to_le32(0); - nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE); + new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE); + + /* Now we're going to cut unnecessary tail pages */ + new_cpages = page_array_alloc(cc->inode, new_nr_cpages); + if (new_cpages) { + ret = -ENOMEM; + goto out_vunmap_cbuf; + } /* zero out any unused part of the last page */ memset(&cc->cbuf->cdata[cc->clen], 0, - (nr_cpages * PAGE_SIZE) - (cc->clen + COMPRESS_HEADER_SIZE)); + (new_nr_cpages * PAGE_SIZE) - + (cc->clen + COMPRESS_HEADER_SIZE)); vm_unmap_ram(cc->cbuf, cc->nr_cpages); vm_unmap_ram(cc->rbuf, cc->cluster_size); - for (i = nr_cpages; i < cc->nr_cpages; i++) { + for (i = 0; i < cc->nr_cpages; i++) { + if (i < new_nr_cpages) { + new_cpages[i] = cc->cpages[i]; + continue; + } f2fs_compress_free_page(cc->cpages[i]); cc->cpages[i] = NULL; } @@ -676,7 +687,9 @@ static int f2fs_compress_pages(struct compress_ctx *cc) if (cops->destroy_compress_ctx) cops->destroy_compress_ctx(cc); - cc->nr_cpages = nr_cpages; + page_array_free(cc->inode, cc->cpages, cc->nr_cpages); + cc->cpages = new_cpages; + cc->nr_cpages = new_nr_cpages; trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx, cc->clen, ret); @@ -691,7 +704,7 @@ static int f2fs_compress_pages(struct compress_ctx *cc) if (cc->cpages[i]) f2fs_compress_free_page(cc->cpages[i]); } - page_array_free(cc->inode, cc->cpages); + page_array_free(cc->inode, cc->cpages, cc->nr_cpages); cc->cpages = NULL; destroy_compress_ctx: if (cops->destroy_compress_ctx) @@ -730,7 +743,7 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity) goto out_free_dic; } - dic->tpages = page_array_alloc(dic->inode); + dic->tpages = page_array_alloc(dic->inode, dic->cluster_size); if (!dic->tpages) { ret = -ENOMEM; goto out_free_dic; @@ -1203,7 +1216,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc, cic->magic = F2FS_COMPRESSED_PAGE_MAGIC; cic->inode = inode; atomic_set(&cic->pending_pages, cc->nr_cpages); - cic->rpages = page_array_alloc(cc->inode); + cic->rpages = page_array_alloc(cc->inode, cc->cluster_size); if (!cic->rpages) goto out_put_cic; @@ -1301,7 +1314,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc, return 0; out_destroy_crypt: - page_array_free(cc->inode, cic->rpages); + page_array_free(cc->inode, cic->rpages, cc->cluster_size); for (--i; i >= 0; i--) fscrypt_finalize_bounce_page(&cc->cpages[i]); @@ -1345,7 +1358,7 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page) end_page_writeback(cic->rpages[i]); } - page_array_free(cic->inode, cic->rpages); + page_array_free(cic->inode, cic->rpages, cic->nr_rpages); kmem_cache_free(cic_entry_slab, cic); } @@ -1442,7 +1455,7 @@ int f2fs_write_multi_pages(struct compress_ctx *cc, err = f2fs_write_compressed_pages(cc, submitted, wbc, io_type); - page_array_free(cc->inode, cc->cpages); + page_array_free(cc->inode, cc->cpages, cc->nr_cpages); cc->cpages = NULL; if (!err) return 0; @@ -1468,7 +1481,7 @@ struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc) if (!dic) return ERR_PTR(-ENOMEM); - dic->rpages = page_array_alloc(cc->inode); + dic->rpages = page_array_alloc(cc->inode, cc->cluster_size); if (!dic->rpages) { kmem_cache_free(dic_entry_slab, dic); return ERR_PTR(-ENOMEM); @@ -1487,7 +1500,7 @@ struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc) dic->rpages[i] = cc->rpages[i]; dic->nr_rpages = cc->cluster_size; - dic->cpages = page_array_alloc(dic->inode); + dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages); if (!dic->cpages) goto out_free; @@ -1522,7 +1535,7 @@ void f2fs_free_dic(struct decompress_io_ctx *dic) continue; f2fs_compress_free_page(dic->tpages[i]); } - page_array_free(dic->inode, dic->tpages); + page_array_free(dic->inode, dic->tpages, dic->cluster_size); } if (dic->cpages) { @@ -1531,10 +1544,10 @@ void f2fs_free_dic(struct decompress_io_ctx *dic) continue; f2fs_compress_free_page(dic->cpages[i]); } - page_array_free(dic->inode, dic->cpages); + page_array_free(dic->inode, dic->cpages, dic->nr_cpages); } - page_array_free(dic->inode, dic->rpages); + page_array_free(dic->inode, dic->rpages, dic->nr_rpages); kmem_cache_free(dic_entry_slab, dic); } -- 2.28.0.709.gb0816b6eb0-goog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AF09BC4727F for ; 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Tue, 29 Sep 2020 08:23:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601367786; bh=7luurs8JgQnoP9+X7r6HhLN7YjvPLnF20aYzggoZCzs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=K8uysvlQ+a1GVqssPt4pk8Te4CCtzqs6uhFfWeT4/L8ymgBF6Je7VCOGFX2InHvoT wArmBik7TMFnLQ0RwaECkDGNnLhvOARD6pwMWI3tM3czOnTBltrgnF+T0M7YoC2+K8 YWFZWWunsscjEqbNF3xahFoU3gY1mVw6EbcBh0VQ= Date: Tue, 29 Sep 2020 01:23:06 -0700 From: Jaegeuk Kim To: Chao Yu Message-ID: <20200929082306.GA1567825@google.com> References: <20200914090514.50102-1-yuchao0@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200914090514.50102-1-yuchao0@huawei.com> X-Headers-End: 1kNAut-009oj8-C9 Subject: Re: [f2fs-dev] [PATCH v2 1/2] f2fs: compress: introduce page array slab cache X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net I found a bug related to the number of page pointer allocation related to nr_cpages. diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index f086ac43ca825..3a18666725fef 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -20,22 +20,20 @@ static struct kmem_cache *cic_entry_slab; static struct kmem_cache *dic_entry_slab; -static void *page_array_alloc(struct inode *inode) +static void *page_array_alloc(struct inode *inode, int nr) { struct f2fs_sb_info *sbi = F2FS_I_SB(inode); - unsigned int size = sizeof(struct page *) << - F2FS_I(inode)->i_log_cluster_size; + unsigned int size = sizeof(struct page *) * nr; if (likely(size == sbi->page_array_slab_size)) return kmem_cache_zalloc(sbi->page_array_slab, GFP_NOFS); return f2fs_kzalloc(sbi, size, GFP_NOFS); } -static void page_array_free(struct inode *inode, void *pages) +static void page_array_free(struct inode *inode, void *pages, int nr) { struct f2fs_sb_info *sbi = F2FS_I_SB(inode); - unsigned int size = sizeof(struct page *) << - F2FS_I(inode)->i_log_cluster_size; + unsigned int size = sizeof(struct page *) * nr; if (!pages) return; @@ -162,13 +160,13 @@ int f2fs_init_compress_ctx(struct compress_ctx *cc) if (cc->rpages) return 0; - cc->rpages = page_array_alloc(cc->inode); + cc->rpages = page_array_alloc(cc->inode, cc->cluster_size); return cc->rpages ? 0 : -ENOMEM; } void f2fs_destroy_compress_ctx(struct compress_ctx *cc) { - page_array_free(cc->inode, cc->rpages); + page_array_free(cc->inode, cc->rpages, cc->cluster_size); cc->rpages = NULL; cc->nr_rpages = 0; cc->nr_cpages = 0; @@ -602,7 +600,8 @@ static int f2fs_compress_pages(struct compress_ctx *cc) struct f2fs_inode_info *fi = F2FS_I(cc->inode); const struct f2fs_compress_ops *cops = f2fs_cops[fi->i_compress_algorithm]; - unsigned int max_len, nr_cpages; + unsigned int max_len, new_nr_cpages; + struct page **new_cpages; int i, ret; trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx, @@ -617,7 +616,7 @@ static int f2fs_compress_pages(struct compress_ctx *cc) max_len = COMPRESS_HEADER_SIZE + cc->clen; cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE); - cc->cpages = page_array_alloc(cc->inode); + cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages); if (!cc->cpages) { ret = -ENOMEM; goto destroy_compress_ctx; @@ -659,16 +658,28 @@ static int f2fs_compress_pages(struct compress_ctx *cc) for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++) cc->cbuf->reserved[i] = cpu_to_le32(0); - nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE); + new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE); + + /* Now we're going to cut unnecessary tail pages */ + new_cpages = page_array_alloc(cc->inode, new_nr_cpages); + if (new_cpages) { + ret = -ENOMEM; + goto out_vunmap_cbuf; + } /* zero out any unused part of the last page */ memset(&cc->cbuf->cdata[cc->clen], 0, - (nr_cpages * PAGE_SIZE) - (cc->clen + COMPRESS_HEADER_SIZE)); + (new_nr_cpages * PAGE_SIZE) - + (cc->clen + COMPRESS_HEADER_SIZE)); vm_unmap_ram(cc->cbuf, cc->nr_cpages); vm_unmap_ram(cc->rbuf, cc->cluster_size); - for (i = nr_cpages; i < cc->nr_cpages; i++) { + for (i = 0; i < cc->nr_cpages; i++) { + if (i < new_nr_cpages) { + new_cpages[i] = cc->cpages[i]; + continue; + } f2fs_compress_free_page(cc->cpages[i]); cc->cpages[i] = NULL; } @@ -676,7 +687,9 @@ static int f2fs_compress_pages(struct compress_ctx *cc) if (cops->destroy_compress_ctx) cops->destroy_compress_ctx(cc); - cc->nr_cpages = nr_cpages; + page_array_free(cc->inode, cc->cpages, cc->nr_cpages); + cc->cpages = new_cpages; + cc->nr_cpages = new_nr_cpages; trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx, cc->clen, ret); @@ -691,7 +704,7 @@ static int f2fs_compress_pages(struct compress_ctx *cc) if (cc->cpages[i]) f2fs_compress_free_page(cc->cpages[i]); } - page_array_free(cc->inode, cc->cpages); + page_array_free(cc->inode, cc->cpages, cc->nr_cpages); cc->cpages = NULL; destroy_compress_ctx: if (cops->destroy_compress_ctx) @@ -730,7 +743,7 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity) goto out_free_dic; } - dic->tpages = page_array_alloc(dic->inode); + dic->tpages = page_array_alloc(dic->inode, dic->cluster_size); if (!dic->tpages) { ret = -ENOMEM; goto out_free_dic; @@ -1203,7 +1216,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc, cic->magic = F2FS_COMPRESSED_PAGE_MAGIC; cic->inode = inode; atomic_set(&cic->pending_pages, cc->nr_cpages); - cic->rpages = page_array_alloc(cc->inode); + cic->rpages = page_array_alloc(cc->inode, cc->cluster_size); if (!cic->rpages) goto out_put_cic; @@ -1301,7 +1314,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc, return 0; out_destroy_crypt: - page_array_free(cc->inode, cic->rpages); + page_array_free(cc->inode, cic->rpages, cc->cluster_size); for (--i; i >= 0; i--) fscrypt_finalize_bounce_page(&cc->cpages[i]); @@ -1345,7 +1358,7 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page) end_page_writeback(cic->rpages[i]); } - page_array_free(cic->inode, cic->rpages); + page_array_free(cic->inode, cic->rpages, cic->nr_rpages); kmem_cache_free(cic_entry_slab, cic); } @@ -1442,7 +1455,7 @@ int f2fs_write_multi_pages(struct compress_ctx *cc, err = f2fs_write_compressed_pages(cc, submitted, wbc, io_type); - page_array_free(cc->inode, cc->cpages); + page_array_free(cc->inode, cc->cpages, cc->nr_cpages); cc->cpages = NULL; if (!err) return 0; @@ -1468,7 +1481,7 @@ struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc) if (!dic) return ERR_PTR(-ENOMEM); - dic->rpages = page_array_alloc(cc->inode); + dic->rpages = page_array_alloc(cc->inode, cc->cluster_size); if (!dic->rpages) { kmem_cache_free(dic_entry_slab, dic); return ERR_PTR(-ENOMEM); @@ -1487,7 +1500,7 @@ struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc) dic->rpages[i] = cc->rpages[i]; dic->nr_rpages = cc->cluster_size; - dic->cpages = page_array_alloc(dic->inode); + dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages); if (!dic->cpages) goto out_free; @@ -1522,7 +1535,7 @@ void f2fs_free_dic(struct decompress_io_ctx *dic) continue; f2fs_compress_free_page(dic->tpages[i]); } - page_array_free(dic->inode, dic->tpages); + page_array_free(dic->inode, dic->tpages, dic->cluster_size); } if (dic->cpages) { @@ -1531,10 +1544,10 @@ void f2fs_free_dic(struct decompress_io_ctx *dic) continue; f2fs_compress_free_page(dic->cpages[i]); } - page_array_free(dic->inode, dic->cpages); + page_array_free(dic->inode, dic->cpages, dic->nr_cpages); } - page_array_free(dic->inode, dic->rpages); + page_array_free(dic->inode, dic->rpages, dic->nr_rpages); kmem_cache_free(dic_entry_slab, dic); } -- 2.28.0.709.gb0816b6eb0-goog _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel