From patchwork Wed May 30 19:48:06 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 10439733 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 74417601D3 for ; Wed, 30 May 2018 19:51:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 569D929388 for ; Wed, 30 May 2018 19:51:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4E874295E0; Wed, 30 May 2018 19:51:09 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI 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 4BF2129516 for ; Wed, 30 May 2018 19:50:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932253AbeE3Tuj (ORCPT ); Wed, 30 May 2018 15:50:39 -0400 Received: from a2nlsmtp01-04.prod.iad2.secureserver.net ([198.71.225.38]:60152 "EHLO a2nlsmtp01-04.prod.iad2.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932312AbeE3TuG (ORCPT ); Wed, 30 May 2018 15:50:06 -0400 Received: from linuxonhyperv2.linuxonhyperv.com ([107.180.71.197]) by : HOSTING RELAY : with SMTP id O75lf6FapN7esO75lf2xu9; Wed, 30 May 2018 12:49:05 -0700 x-originating-ip: 107.180.71.197 Received: from longli by linuxonhyperv2.linuxonhyperv.com with local (Exim 4.91) (envelope-from ) id 1fO75l-0008Gh-3i; Wed, 30 May 2018 12:49:05 -0700 From: Long Li To: Steve French , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org Cc: Long Li Subject: [Patch v2 14/15] CIFS: Add support for direct I/O write Date: Wed, 30 May 2018 12:48:06 -0700 Message-Id: <20180530194807.31657-15-longli@linuxonhyperv.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180530194807.31657-1-longli@linuxonhyperv.com> References: <20180530194807.31657-1-longli@linuxonhyperv.com> Reply-To: longli@microsoft.com X-CMAE-Envelope: MS4wfP7ZAtMVKrbH2V0wa8Kzp7fPsIttG6C8sZ9JQ3Xe7txcMUfLCTeBqUNtOFSkxwVXSv3XSecXgLNVq1mBBNBIQvejKbmyvUlz+7xYqldQzktKnocnMeiw VuLPcQMXn4Q7Leq9p6P2qk94xMFBsXM9oaBVjsw0s8lQvYJ3g+SgnmdjRpa/veTO3Cl5wwDJMYrZowI/qMWfFV6DMRXnPDv0oWBnk7KxbUsbEIT6eWQ/hFXI gN1bh8CdyNhSk7i+/Tfqmq9GarWiANxO6mvQ0zVzLFeQCyvBpaB8xCRzxFFPfrVLH5BOzqmowYYPi1iVwEbFMJh7f2NKH4CkG5BMDEahvtQucOiqlcA+Jq4o L4/OtcbK5mpgY0zlquWYzC3p7MdcHZw87JPI+ElhWHOPOIuYAjJ4dyD5z8td6WrkiDgh71yV Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Long Li Implement the function for direct I/O write. It doesn't support AIO, which will be implemented in a follow up patch. Signed-off-by: Long Li --- fs/cifs/cifsfs.h | 1 + fs/cifs/file.c | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 166 insertions(+) diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h index 7fba9aa..e9c5103 100644 --- a/fs/cifs/cifsfs.h +++ b/fs/cifs/cifsfs.h @@ -105,6 +105,7 @@ extern ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to); extern ssize_t cifs_direct_readv(struct kiocb *iocb, struct iov_iter *to); extern ssize_t cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to); extern ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from); +extern ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from); extern ssize_t cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from); extern int cifs_lock(struct file *, int, struct file_lock *); extern int cifs_fsync(struct file *, loff_t, loff_t, int); diff --git a/fs/cifs/file.c b/fs/cifs/file.c index e6e6f24..8c385b1 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2461,6 +2461,35 @@ cifs_uncached_writedata_release(struct kref *refcount) static void collect_uncached_write_data(struct cifs_aio_ctx *ctx); +static void cifs_direct_writedata_release(struct kref *refcount) +{ + int i; + struct cifs_writedata *wdata = container_of(refcount, + struct cifs_writedata, refcount); + + for (i = 0; i < wdata->nr_pages; i++) + put_page(wdata->pages[i]); + + cifs_writedata_release(refcount); +} + +static void cifs_direct_writev_complete(struct work_struct *work) +{ + struct cifs_writedata *wdata = container_of(work, + struct cifs_writedata, work); + struct inode *inode = d_inode(wdata->cfile->dentry); + struct cifsInodeInfo *cifsi = CIFS_I(inode); + + spin_lock(&inode->i_lock); + cifs_update_eof(cifsi, wdata->offset, wdata->bytes); + if (cifsi->server_eof > inode->i_size) + i_size_write(inode, cifsi->server_eof); + spin_unlock(&inode->i_lock); + + complete(&wdata->done); + kref_put(&wdata->refcount, cifs_direct_writedata_release); +} + static void cifs_uncached_writev_complete(struct work_struct *work) { @@ -2703,6 +2732,142 @@ static void collect_uncached_write_data(struct cifs_aio_ctx *ctx) complete(&ctx->done); } +ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from) +{ + struct file *file = iocb->ki_filp; + ssize_t total_written = 0; + struct cifsFileInfo *cfile; + struct cifs_tcon *tcon; + struct cifs_sb_info *cifs_sb; + struct TCP_Server_Info *server; + pid_t pid; + unsigned long nr_pages; + loff_t offset = iocb->ki_pos; + size_t len = iov_iter_count(from); + int rc; + struct cifs_writedata *wdata; + + /* + * iov_iter_get_pages_alloc doesn't work with ITER_KVEC. + * In this case, fall back to non-direct write function. + */ + if (from->type & ITER_KVEC) { + cifs_dbg(FYI, "use non-direct cifs_user_writev for kvec I/O\n"); + return cifs_user_writev(iocb, from); + } + + rc = generic_write_checks(iocb, from); + if (rc <= 0) + return rc; + + cifs_sb = CIFS_FILE_SB(file); + cfile = file->private_data; + tcon = tlink_tcon(cfile->tlink); + server = tcon->ses->server; + + if (!server->ops->async_writev) + return -ENOSYS; + + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) + pid = cfile->pid; + else + pid = current->tgid; + + do { + unsigned int wsize, credits; + struct page **pagevec; + size_t start; + ssize_t cur_len; + + rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, + &wsize, &credits); + if (rc) + break; + + cur_len = iov_iter_get_pages_alloc( + from, &pagevec, wsize, &start); + if (cur_len < 0) { + cifs_dbg(VFS, + "direct_writev couldn't get user pages " + "(rc=%zd) iter type %d iov_offset %lu count" + " %lu\n", + cur_len, from->type, + from->iov_offset, from->count); + dump_stack(); + break; + } + if (cur_len < 0) + break; + + nr_pages = (cur_len + start + PAGE_SIZE - 1) / PAGE_SIZE; + + wdata = cifs_writedata_direct_alloc(pagevec, + cifs_direct_writev_complete); + if (!wdata) { + rc = -ENOMEM; + add_credits_and_wake_if(server, credits, 0); + break; + } + + wdata->nr_pages = nr_pages; + wdata->page_offset = start; + wdata->pagesz = PAGE_SIZE; + wdata->tailsz = + nr_pages > 1 ? + cur_len - (PAGE_SIZE - start) - + (nr_pages - 2) * PAGE_SIZE : + cur_len; + + wdata->sync_mode = WB_SYNC_ALL; + wdata->offset = (__u64)offset; + wdata->cfile = cifsFileInfo_get(cfile); + wdata->pid = pid; + wdata->bytes = cur_len; + wdata->credits = credits; + + rc = 0; + if (wdata->cfile->invalidHandle) + rc = cifs_reopen_file(wdata->cfile, false); + + if (!rc) + rc = server->ops->async_writev(wdata, + cifs_direct_writedata_release); + + if (rc) { + add_credits_and_wake_if(server, wdata->credits, 0); + kref_put(&wdata->refcount, + cifs_direct_writedata_release); + if (rc == -EAGAIN) + continue; + break; + } + + wait_for_completion(&wdata->done); + if (wdata->result) { + rc = wdata->result; + kref_put(&wdata->refcount, + cifs_direct_writedata_release); + if (rc == -EAGAIN) + continue; + break; + } + + kref_put(&wdata->refcount, cifs_direct_writedata_release); + + iov_iter_advance(from, cur_len); + total_written += cur_len; + offset += cur_len; + len -= cur_len; + } while (len); + + if (unlikely(!total_written)) + return rc; + + iocb->ki_pos += total_written; + return total_written; + +} + ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from) { struct file *file = iocb->ki_filp;