From patchwork Fri Apr 15 12:35:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 12814858 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 AF8B1C433FE for ; Fri, 15 Apr 2022 12:36:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353455AbiDOMi5 (ORCPT ); Fri, 15 Apr 2022 08:38:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353424AbiDOMix (ORCPT ); Fri, 15 Apr 2022 08:38:53 -0400 Received: from out30-43.freemail.mail.aliyun.com (out30-43.freemail.mail.aliyun.com [115.124.30.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D33B32316B; Fri, 15 Apr 2022 05:36:23 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R141e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e01424;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=19;SR=0;TI=SMTPD_---0VA7GjEt_1650026176; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0VA7GjEt_1650026176) by smtp.aliyun-inc.com(127.0.0.1); Fri, 15 Apr 2022 20:36:17 +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, luodaowen.backend@bytedance.com, tianzichen@kuaishou.com, fannaihao@baidu.com, zhangjiachen.jaycee@bytedance.com Subject: [PATCH v9 01/21] cachefiles: extract write routine Date: Fri, 15 Apr 2022 20:35:54 +0800 Message-Id: <20220415123614.54024-2-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220415123614.54024-1-jefflexu@linux.alibaba.com> References: <20220415123614.54024-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Extract the generic routine of writing data to cache files, and make it generally available. This will be used by the following patch implementing on-demand read mode. Since it's called inside cachefiles module in this case, make the interface generic and unrelated to netfs_cache_resources. It is worth noting that, ki->inval_counter is not initialized after this cleanup. It shall not make any visible difference, since inval_counter is no longer used in the write completion routine, i.e. cachefiles_write_complete(). Signed-off-by: Jeffle Xu Acked-by: David Howells --- fs/cachefiles/internal.h | 10 +++++++ fs/cachefiles/io.c | 61 +++++++++++++++++++++++----------------- 2 files changed, 45 insertions(+), 26 deletions(-) diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index c793d33b0224..e80673d0ab97 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -201,6 +201,16 @@ extern void cachefiles_put_object(struct cachefiles_object *object, */ extern bool cachefiles_begin_operation(struct netfs_cache_resources *cres, enum fscache_want_state want_state); +extern int __cachefiles_prepare_write(struct cachefiles_object *object, + struct file *file, + loff_t *_start, size_t *_len, + bool no_space_allocated_yet); +extern int __cachefiles_write(struct cachefiles_object *object, + struct file *file, + loff_t start_pos, + struct iov_iter *iter, + netfs_io_terminated_t term_func, + void *term_func_priv); /* * key.c diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c index 9dc81e781f2b..50a14e8f0aac 100644 --- a/fs/cachefiles/io.c +++ b/fs/cachefiles/io.c @@ -277,36 +277,33 @@ static void cachefiles_write_complete(struct kiocb *iocb, long ret) /* * Initiate a write to the cache. */ -static int cachefiles_write(struct netfs_cache_resources *cres, - loff_t start_pos, - struct iov_iter *iter, - netfs_io_terminated_t term_func, - void *term_func_priv) +int __cachefiles_write(struct cachefiles_object *object, + struct file *file, + loff_t start_pos, + struct iov_iter *iter, + netfs_io_terminated_t term_func, + void *term_func_priv) { - struct cachefiles_object *object; struct cachefiles_cache *cache; struct cachefiles_kiocb *ki; struct inode *inode; - struct file *file; unsigned int old_nofs; - ssize_t ret = -ENOBUFS; + ssize_t ret; size_t len = iov_iter_count(iter); - if (!fscache_wait_for_operation(cres, FSCACHE_WANT_WRITE)) - goto presubmission_error; fscache_count_write(); - object = cachefiles_cres_object(cres); cache = object->volume->cache; - file = cachefiles_cres_file(cres); _enter("%pD,%li,%llx,%zx/%llx", file, file_inode(file)->i_ino, start_pos, len, i_size_read(file_inode(file))); - ret = -ENOMEM; ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL); - if (!ki) - goto presubmission_error; + if (!ki) { + if (term_func) + term_func(term_func_priv, -ENOMEM, false); + return -ENOMEM; + } refcount_set(&ki->ki_refcnt, 2); ki->iocb.ki_filp = file; @@ -314,7 +311,6 @@ static int cachefiles_write(struct netfs_cache_resources *cres, ki->iocb.ki_flags = IOCB_DIRECT | IOCB_WRITE; ki->iocb.ki_ioprio = get_current_ioprio(); ki->object = object; - ki->inval_counter = cres->inval_counter; ki->start = start_pos; ki->len = len; ki->term_func = term_func; @@ -369,11 +365,24 @@ static int cachefiles_write(struct netfs_cache_resources *cres, cachefiles_put_kiocb(ki); _leave(" = %zd", ret); return ret; +} -presubmission_error: - if (term_func) - term_func(term_func_priv, ret, false); - return ret; +static int cachefiles_write(struct netfs_cache_resources *cres, + loff_t start_pos, + struct iov_iter *iter, + netfs_io_terminated_t term_func, + void *term_func_priv) +{ + if (!fscache_wait_for_operation(cres, FSCACHE_WANT_WRITE)) { + if (term_func) + term_func(term_func_priv, -ENOBUFS, false); + return -ENOBUFS; + } + + return __cachefiles_write(cachefiles_cres_object(cres), + cachefiles_cres_file(cres), + start_pos, iter, + term_func, term_func_priv); } /* @@ -484,13 +493,12 @@ static enum netfs_io_source cachefiles_prepare_read(struct netfs_io_subrequest * /* * Prepare for a write to occur. */ -static int __cachefiles_prepare_write(struct netfs_cache_resources *cres, - loff_t *_start, size_t *_len, loff_t i_size, - bool no_space_allocated_yet) +int __cachefiles_prepare_write(struct cachefiles_object *object, + struct file *file, + loff_t *_start, size_t *_len, + bool no_space_allocated_yet) { - struct cachefiles_object *object = cachefiles_cres_object(cres); struct cachefiles_cache *cache = object->volume->cache; - struct file *file = cachefiles_cres_file(cres); loff_t start = *_start, pos; size_t len = *_len, down; int ret; @@ -577,7 +585,8 @@ static int cachefiles_prepare_write(struct netfs_cache_resources *cres, } cachefiles_begin_secure(cache, &saved_cred); - ret = __cachefiles_prepare_write(cres, _start, _len, i_size, + ret = __cachefiles_prepare_write(object, cachefiles_cres_file(cres), + _start, _len, no_space_allocated_yet); cachefiles_end_secure(cache, saved_cred); return ret;