From patchwork Wed Aug 31 02:49:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ronnie Sahlberg X-Patchwork-Id: 12960275 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 B6AC0ECAAD5 for ; Wed, 31 Aug 2022 02:50:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231450AbiHaCuQ (ORCPT ); Tue, 30 Aug 2022 22:50:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231161AbiHaCuO (ORCPT ); Tue, 30 Aug 2022 22:50:14 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EAE5A6525E for ; Tue, 30 Aug 2022 19:50:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1661914212; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WVsgJBkdBaEUZF0Uub89yn/xzl2UxzqsyTkmrPlSAzE=; b=ah+0lIX2XsawQHoq17IgyCqCMVuMmismeew1DEAzFfS9H1YM1yKyAMu1VKJ1Qm8ZbTR7gK oKgSW7Es6xq3lhUz9fywMhbIfN7PR6kFkaBdkVo6l+NPot9EUdBgeYBfAPonRzfqwHT0LB z2VJej/bGMG1Qc16TKCk77rkpPJtVWY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-403-VFJ5Mx32OC-lsnqqJkZDiA-1; Tue, 30 Aug 2022 22:50:10 -0400 X-MC-Unique: VFJ5Mx32OC-lsnqqJkZDiA-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2073F80A0C2; Wed, 31 Aug 2022 02:50:10 +0000 (UTC) Received: from localhost.localdomain (vpn2-52-20.bne.redhat.com [10.64.52.20]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3268E492C3B; Wed, 31 Aug 2022 02:50:08 +0000 (UTC) From: Ronnie Sahlberg To: linux-cifs Cc: Steve French , Ronnie Sahlberg Subject: [PATCH 5/6] cifs: find and use the dentry for cached non-root directories also Date: Wed, 31 Aug 2022 12:49:46 +1000 Message-Id: <20220831024947.3917507-6-lsahlber@redhat.com> In-Reply-To: <20220831024947.3917507-1-lsahlber@redhat.com> References: <20220831024947.3917507-1-lsahlber@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org This allows us to use cached attributes for the entries in a cached directory for as long as a lease is held on the directory itself. Previously we have always allowed "used cached attributes for 1 second" but this extends this to the lifetime of the lease as well as making the caching safer. Signed-off-by: Ronnie Sahlberg --- fs/cifs/cached_dir.c | 70 +++++++++++++++++++++++++++++++++++--------- 1 file changed, 56 insertions(+), 14 deletions(-) diff --git a/fs/cifs/cached_dir.c b/fs/cifs/cached_dir.c index ce6935c3fe06..20aba23d8d88 100644 --- a/fs/cifs/cached_dir.c +++ b/fs/cifs/cached_dir.c @@ -5,6 +5,7 @@ * Copyright (c) 2022, Ronnie Sahlberg */ +#include #include "cifsglob.h" #include "cifsproto.h" #include "cifs_debug.h" @@ -59,6 +60,50 @@ static struct cached_fid *find_or_create_cached_dir(struct cached_fids *cfids, return cfid; } +static struct dentry * +path_to_dentry(struct cifs_sb_info *cifs_sb, const char *full_path) +{ + struct dentry *dentry; + char *path = NULL; + char *s, *p; + char sep; + + path = kstrdup(full_path, GFP_ATOMIC); + if (path == NULL) + return ERR_PTR(-ENOMEM); + + sep = CIFS_DIR_SEP(cifs_sb); + dentry = dget(cifs_sb->root); + s = path; + + do { + struct inode *dir = d_inode(dentry); + struct dentry *child; + + if (!S_ISDIR(dir->i_mode)) { + dput(dentry); + dentry = ERR_PTR(-ENOTDIR); + break; + } + + /* skip separators */ + while (*s == sep) + s++; + if (!*s) + break; + p = s++; + /* next separator */ + while (*s && *s != sep) + s++; + + child = lookup_positive_unlocked(p, dentry, s - p); + dput(dentry); + dentry = child; + } while (!IS_ERR(dentry)); + kfree(path); + return dentry; +} + /* * Open the and cache a directory handle. * If error then *cfid is not initialized. @@ -85,7 +130,6 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, struct dentry *dentry = NULL; struct cached_fid *cfid; struct cached_fids *cfids; - if (tcon == NULL || tcon->cfids == NULL || tcon->nohandlecache || is_smb1_server(tcon->ses->server)) @@ -101,13 +145,6 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, if (cifs_sb->root == NULL) return -ENOENT; - /* - * TODO: for better caching we need to find and use the dentry also - * for non-root directories. - */ - if (!path[0]) - dentry = cifs_sb->root; - utf16_path = cifs_convert_path_to_utf16(path, cifs_sb); if (!utf16_path) return -ENOMEM; @@ -199,12 +236,6 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, oparms.fid->mid = le64_to_cpu(o_rsp->hdr.MessageId); #endif /* CIFS_DEBUG2 */ - cfid->tcon = tcon; - if (dentry) { - cfid->dentry = dentry; - dget(dentry); - } - /* BB TBD check to see if oplock level check can be removed below */ if (o_rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE) { goto oshr_free; } @@ -223,6 +254,17 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon, &rsp_iov[1], sizeof(struct smb2_file_all_info), (char *)&cfid->file_all_info)) cfid->file_all_info_is_valid = true; + + if (!strlen(path)) { + dentry = dget(cifs_sb->root); + cfid->dentry = dentry; + } else{ + dentry = path_to_dentry(cifs_sb, path); + if (IS_ERR(dentry)) + goto oshr_free; + cfid->dentry = dentry; + } + cfid->tcon = tcon; cfid->time = jiffies; cfid->is_open = true; cfid->has_lease = true;