Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25CDBC433F5 for ; Mon, 27 Dec 2021 12:56:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234123AbhL0M4A (ORCPT ); Mon, 27 Dec 2021 07:56:00 -0500 Received: from out30-45.freemail.mail.aliyun.com ([115.124.30.45]:46182 "EHLO out30-45.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236823AbhL0My6 (ORCPT ); Mon, 27 Dec 2021 07:54:58 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R461e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=12;SR=0;TI=SMTPD_---0V.xJoQp_1640609696; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0V.xJoQp_1640609696) by smtp.aliyun-inc.com(127.0.0.1); Mon, 27 Dec 2021 20:54:57 +0800 From: Jeffle Xu To: dhowells@redhat.com, linux-cachefs@redhat.com, xiang@kernel.org, chao@kernel.org, linux-erofs@lists.ozlabs.org Cc: linux-fsdevel@vger.kernel.org, joseph.qi@linux.alibaba.com, bo.liu@linux.alibaba.com, tao.peng@linux.alibaba.com, gerry@linux.alibaba.com, eguan@linux.alibaba.com, linux-kernel@vger.kernel.org Subject: [PATCH v1 10/23] erofs: add anonymous inode managing page cache of blob file Date: Mon, 27 Dec 2021 20:54:31 +0800 Message-Id: <20211227125444.21187-11-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211227125444.21187-1-jefflexu@linux.alibaba.com> References: <20211227125444.21187-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce one anonymous inode for managing page cache of corresponding blob file. Then erofs could read directly from the address space of the anonymous inode when cache hit. Signed-off-by: Jeffle Xu --- fs/erofs/fscache.c | 35 +++++++++++++++++++++++++++++++++++ fs/erofs/internal.h | 1 + 2 files changed, 36 insertions(+) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 15c5bb0f8ea5..4dfca7c95710 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -34,6 +34,33 @@ static void erofs_fscache_cleanup_cookie(struct erofs_cookie_ctx *ctx) ctx->cookie = NULL; } +static const struct address_space_operations erofs_fscache_aops = { +}; + +static int erofs_fscache_get_inode(struct erofs_cookie_ctx *ctx, + struct super_block *sb) +{ + struct inode *const inode = new_inode(sb); + + if (!inode) + return -ENOMEM; + + set_nlink(inode, 1); + inode->i_size = OFFSET_MAX; + + inode->i_mapping->a_ops = &erofs_fscache_aops; + mapping_set_gfp_mask(inode->i_mapping, + GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE); + ctx->inode = inode; + return 0; +} + +static void erofs_fscache_put_inode(struct erofs_cookie_ctx *ctx) +{ + iput(ctx->inode); + ctx->inode = NULL; +} + static int erofs_fscahce_init_ctx(struct erofs_cookie_ctx *ctx, struct super_block *sb, char *path) { @@ -45,12 +72,20 @@ static int erofs_fscahce_init_ctx(struct erofs_cookie_ctx *ctx, return ret; } + ret = erofs_fscache_get_inode(ctx, sb); + if (ret) { + erofs_err(sb, "failed to get anonymous inode\n"); + erofs_fscache_cleanup_cookie(ctx); + return ret; + } + return 0; } static void erofs_fscache_cleanup_ctx(struct erofs_cookie_ctx *ctx) { erofs_fscache_cleanup_cookie(ctx); + erofs_fscache_put_inode(ctx); } struct erofs_cookie_ctx *erofs_fscache_get_ctx(struct super_block *sb, diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 4179c3dcb7f9..2e4f267b37e7 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -93,6 +93,7 @@ struct erofs_sb_lz4_info { struct erofs_cookie_ctx { struct fscache_cookie *cookie; + struct inode *inode; }; struct erofs_sb_info { -- 2.27.0