From patchwork Mon Mar 7 12:32:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 12771737 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 43474C433EF for ; Mon, 7 Mar 2022 12:34:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242394AbiCGMfD (ORCPT ); Mon, 7 Mar 2022 07:35:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242391AbiCGMen (ORCPT ); Mon, 7 Mar 2022 07:34:43 -0500 Received: from out30-42.freemail.mail.aliyun.com (out30-42.freemail.mail.aliyun.com [115.124.30.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9CCBC3FD93; Mon, 7 Mar 2022 04:33:26 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R531e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04357;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=15;SR=0;TI=SMTPD_---0V6VOeph_1646656403; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0V6VOeph_1646656403) by smtp.aliyun-inc.com(127.0.0.1); Mon, 07 Mar 2022 20:33:24 +0800 From: Jeffle Xu To: dhowells@redhat.com, linux-cachefs@redhat.com, xiang@kernel.org, chao@kernel.org, linux-erofs@lists.ozlabs.org Cc: torvalds@linux-foundation.org, gregkh@linuxfoundation.org, willy@infradead.org, 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 v4 12/21] erofs: add anonymous inode managing page cache of blob file Date: Mon, 7 Mar 2022 20:32:56 +0800 Message-Id: <20220307123305.79520-13-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220307123305.79520-1-jefflexu@linux.alibaba.com> References: <20220307123305.79520-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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 | 45 ++++++++++++++++++++++++++++++++++++++++++--- fs/erofs/internal.h | 3 ++- 2 files changed, 44 insertions(+), 4 deletions(-) diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 77d2b46e7ff1..4d83125ff896 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -6,6 +6,9 @@ static struct fscache_volume *volume; +static const struct address_space_operations erofs_fscache_blob_aops = { +}; + static int erofs_fscache_init_cookie(struct erofs_fscache_context *ctx, char *path) { @@ -36,8 +39,34 @@ void erofs_fscache_cleanup_cookie(struct erofs_fscache_context *ctx) ctx->cookie = NULL; } +static int erofs_fscache_get_inode(struct erofs_fscache_context *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_blob_aops; + mapping_set_gfp_mask(inode->i_mapping, + GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE); + ctx->inode = inode; + return 0; +} + +static inline +void erofs_fscache_put_inode(struct erofs_fscache_context *ctx) +{ + iput(ctx->inode); + ctx->inode = NULL; +} + static int erofs_fscache_init_ctx(struct erofs_fscache_context *ctx, - struct super_block *sb, char *path) + struct super_block *sb, char *path, + bool need_inode) { int ret; @@ -47,6 +76,15 @@ static int erofs_fscache_init_ctx(struct erofs_fscache_context *ctx, return ret; } + if (need_inode) { + ret = erofs_fscache_get_inode(ctx, sb); + if (ret) { + erofs_err(sb, "failed to get anonymous inode"); + erofs_fscache_cleanup_cookie(ctx); + return ret; + } + } + return 0; } @@ -54,10 +92,11 @@ static inline void erofs_fscache_cleanup_ctx(struct erofs_fscache_context *ctx) { erofs_fscache_cleanup_cookie(ctx); + erofs_fscache_put_inode(ctx); } struct erofs_fscache_context *erofs_fscache_get_ctx(struct super_block *sb, - char *path) + char *path, bool need_inode) { struct erofs_fscache_context *ctx; int ret; @@ -66,7 +105,7 @@ struct erofs_fscache_context *erofs_fscache_get_ctx(struct super_block *sb, if (!ctx) return ERR_PTR(-ENOMEM); - ret = erofs_fscache_init_ctx(ctx, sb, path); + ret = erofs_fscache_init_ctx(ctx, sb, path, need_inode); if (ret) { kfree(ctx); return ERR_PTR(ret); diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 1f5bc69e8e9f..bb5e992fe0df 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -99,6 +99,7 @@ struct erofs_sb_lz4_info { struct erofs_fscache_context { struct fscache_cookie *cookie; + struct inode *inode; }; struct erofs_sb_info { @@ -626,7 +627,7 @@ int erofs_init_fscache(void); void erofs_exit_fscache(void); struct erofs_fscache_context *erofs_fscache_get_ctx(struct super_block *sb, - char *path); + char *path, bool need_inode); void erofs_fscache_put_ctx(struct erofs_fscache_context *ctx); #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */