From patchwork Fri Jan 11 06:24:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steve French X-Patchwork-Id: 10757461 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 778CC1399 for ; Fri, 11 Jan 2019 06:25:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E9AC1299BE for ; Fri, 11 Jan 2019 06:25:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DDADC29B22; Fri, 11 Jan 2019 06:25:13 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable 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 05A4E299C9 for ; Fri, 11 Jan 2019 06:25:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730477AbfAKGZH (ORCPT ); Fri, 11 Jan 2019 01:25:07 -0500 Received: from mail-pg1-f177.google.com ([209.85.215.177]:43798 "EHLO mail-pg1-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728295AbfAKGZH (ORCPT ); Fri, 11 Jan 2019 01:25:07 -0500 Received: by mail-pg1-f177.google.com with SMTP id v28so5883520pgk.10; Thu, 10 Jan 2019 22:25:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ol//U3TDKHlVdIcTiYZgJWZueZkmNjJlUQ0lD7JH1ys=; b=c9xpndwqUokEmeFxh/T3M4uLYmsLIIgkrb3zMIZW/Gu6pgTE/wbXQPL3WZjpoCnL4l LKcqzuciCh73SEsVU+V3VdcQNwozB+6ZuBtAdwI8kfa51FYjJmHYKACTCkOjFn9HMscq 5621hVoy3JndMnKqB1+ehN2tieUtfVf59m/3a2gWoWeLMk4k19STvMBXooMrXdghCGeY gqjzNkMadiOwyJBx99hbYezs0MwV0oon1W+7ERwVGRZXzB2aCfhkubro14HLMhNE9Tbn ydveqxPAAIXvHjk1ySyPRq0BPDvt8XA8ZWbxAnXdJfM+f8ETbahkmOM7DRWX/Qp0ClEX nXfg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ol//U3TDKHlVdIcTiYZgJWZueZkmNjJlUQ0lD7JH1ys=; b=ddQIXPx5g715MjKgBfpsAZ9yy5EihfQrnLiINC59SPtI0Gme6tzkziw50YA8VVz7mZ VWFo4cunvpJUoPd4144GRcYEHfztjzdEha7PTsNc9sNRao0IMCveI5hY4fCa9U+rJoQC 3W0PI7Y3JnMDVJKRYElA6gtyvn+DqCAh1Jbri4B1fetABk/vYu5MjqapHkfeYwIL0Jmx vd85OrHPSickWQHNKWaqVUPAamEysG1PMkXnp4x7OFszlkAxqESdrWN0GfyQI4NHGxEu SHkfDOAMWmjqFdaGZUXQ667wnzgkOVMmgmyVrKU6unUzM0fAbKd6uo9+lyyHgvQYw0NL oujA== X-Gm-Message-State: AJcUukft6ezKIVxoH89KicIF3vxruhdwdkK5iol4sFj8mlFLTnF16LX+ OuV6A/86fhxAhh1dG3malJDgFhOI4UD61HdSPZeyNw== X-Google-Smtp-Source: ALg8bN5ZRR8AeTqs7pD3UNwQXGIH5b0/wJCZ65nPcW+ENzdOOTtS4O3IcDCNDgfQ/Y9mC51h8Z0l5MKQJ6ZI/Dv/hE0= X-Received: by 2002:a63:82c6:: with SMTP id w189mr12397112pgd.344.1547187905755; Thu, 10 Jan 2019 22:25:05 -0800 (PST) MIME-Version: 1.0 References: <1547159098-19011-1-git-send-email-pshilov@microsoft.com> <1547159098-19011-8-git-send-email-pshilov@microsoft.com> In-Reply-To: <1547159098-19011-8-git-send-email-pshilov@microsoft.com> From: Steve French Date: Fri, 11 Jan 2019 00:24:54 -0600 Message-ID: Subject: Fwd: [PATCH 7/7] CIFS: Fix error paths in writeback code To: linux-fsdevel , bfoster@redhat.com, Jeff Layton Cc: Pavel Shilovskiy , CIFS , LKML Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP These changes in writepage and writepages for cifs remind me of loosely related writeback changes that Jeff and Brian have done in the VFS/MM layer, so was hopeful that others might have comments if they see anything missing from Pavel's patch. ---------- Forwarded message --------- From: Pavel Shilovsky Date: Thu, Jan 10, 2019 at 4:25 PM Subject: [PATCH 7/7] CIFS: Fix error paths in writeback code To: Cc: Steve French , Ronnie Sahlberg This patch aims to address writeback code problems related to error paths. In particular it respects EINTR and related error codes and stores the first error occured during writeback in order to return it to a caller. Signed-off-by: Pavel Shilovsky --- fs/cifs/cifsglob.h | 19 +++++++++++++++++++ fs/cifs/cifssmb.c | 7 ++++--- fs/cifs/file.c | 29 +++++++++++++++++++++++------ fs/cifs/inode.c | 10 ++++++++++ 4 files changed, 56 insertions(+), 9 deletions(-) @@ -2403,6 +2408,11 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs) * the flush returns error? */ rc = filemap_write_and_wait(inode->i_mapping); + if (is_interrupt_error(rc)) { + rc = -ERESTARTSYS; + goto cifs_setattr_exit; + } + mapping_set_error(inode->i_mapping, rc); rc = 0; -- 2.7.4 diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 7709268..94dbdbe 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -1575,6 +1575,25 @@ static inline void free_dfs_info_array(struct dfs_info3_param *param, kfree(param); } +static inline bool is_interrupt_error(int error) +{ + switch (error) { + case -EINTR: + case -ERESTARTSYS: + case -ERESTARTNOHAND: + case -ERESTARTNOINTR: + return true; + } + return false; +} + +static inline bool is_retryable_error(int error) +{ + if (is_interrupt_error(error) || error == -EAGAIN) + return true; + return false; +} + #define MID_FREE 0 #define MID_REQUEST_ALLOCATED 1 #define MID_REQUEST_SUBMITTED 2 diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index b1f49c1..6930cdb 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -2114,7 +2114,7 @@ cifs_writev_requeue(struct cifs_writedata *wdata) for (j = 0; j < nr_pages; j++) { unlock_page(wdata2->pages[j]); - if (rc != 0 && rc != -EAGAIN) { + if (rc != 0 && !is_retryable_error(rc)) { SetPageError(wdata2->pages[j]); end_page_writeback(wdata2->pages[j]); put_page(wdata2->pages[j]); @@ -2123,7 +2123,7 @@ cifs_writev_requeue(struct cifs_writedata *wdata) if (rc) { kref_put(&wdata2->refcount, cifs_writedata_release); - if (rc == -EAGAIN) + if (is_retryable_error(rc)) continue; break; } @@ -2132,7 +2132,8 @@ cifs_writev_requeue(struct cifs_writedata *wdata) i += nr_pages; } while (i < wdata->nr_pages); - mapping_set_error(inode->i_mapping, rc); + if (rc != 0 && !is_retryable_error(rc)) + mapping_set_error(inode->i_mapping, rc); kref_put(&wdata->refcount, cifs_writedata_release); } diff --git a/fs/cifs/file.c b/fs/cifs/file.c index c23bf9d..109b1ef 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -732,7 +732,8 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) if (can_flush) { rc = filemap_write_and_wait(inode->i_mapping); - mapping_set_error(inode->i_mapping, rc); + if (!is_interrupt_error(rc)) + mapping_set_error(inode->i_mapping, rc); if (tcon->unix_ext) rc = cifs_get_inode_info_unix(&inode, full_path, @@ -2109,6 +2110,7 @@ static int cifs_writepages(struct address_space *mapping, pgoff_t end, index; struct cifs_writedata *wdata; int rc = 0; + int saved_rc = 0; unsigned int xid; /* @@ -2137,8 +2139,10 @@ static int cifs_writepages(struct address_space *mapping, rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize, &wsize, &credits); - if (rc) + if (rc != 0) { + done = true; break; + } tofind = min((wsize / PAGE_SIZE) - 1, end - index) + 1; @@ -2146,6 +2150,7 @@ static int cifs_writepages(struct address_space *mapping, &found_pages); if (!wdata) { rc = -ENOMEM; + done = true; add_credits_and_wake_if(server, credits, 0); break; } @@ -2174,7 +2179,7 @@ static int cifs_writepages(struct address_space *mapping, if (rc != 0) { add_credits_and_wake_if(server, wdata->credits, 0); for (i = 0; i < nr_pages; ++i) { - if (rc == -EAGAIN) + if (is_retryable_error(rc)) redirty_page_for_writepage(wbc, wdata->pages[i]); else @@ -2182,7 +2187,7 @@ static int cifs_writepages(struct address_space *mapping, end_page_writeback(wdata->pages[i]); put_page(wdata->pages[i]); } - if (rc != -EAGAIN) + if (!is_retryable_error(rc)) mapping_set_error(mapping, rc); } kref_put(&wdata->refcount, cifs_writedata_release); @@ -2192,6 +2197,15 @@ static int cifs_writepages(struct address_space *mapping, continue; } + /* Return immediately if we received a signal during writing */ + if (is_interrupt_error(rc)) { + done = true; + break; + } + + if (rc != 0 && saved_rc == 0) + saved_rc = rc; + wbc->nr_to_write -= nr_pages; if (wbc->nr_to_write <= 0) done = true; @@ -2209,6 +2223,9 @@ static int cifs_writepages(struct address_space *mapping, goto retry; } + if (saved_rc != 0) + rc = saved_rc; + if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) mapping->writeback_index = index; @@ -2241,8 +2258,8 @@ cifs_writepage_locked(struct page *page, struct writeback_control *wbc) set_page_writeback(page); retry_write: rc = cifs_partialpagewrite(page, 0, PAGE_SIZE); - if (rc == -EAGAIN) { - if (wbc->sync_mode == WB_SYNC_ALL) + if (is_retryable_error(rc)) { + if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) goto retry_write; redirty_page_for_writepage(wbc, page); } else if (rc != 0) { diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 5b883a0..ba1152b 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -2260,6 +2260,11 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs) * the flush returns error? */ rc = filemap_write_and_wait(inode->i_mapping); + if (is_interrupt_error(rc)) { + rc = -ERESTARTSYS; + goto out; + } + mapping_set_error(inode->i_mapping, rc); rc = 0;