From patchwork Tue Nov 3 15:33:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Trond Myklebust X-Patchwork-Id: 11878203 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B7DA5166C for ; Tue, 3 Nov 2020 15:43:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E7B3221FB for ; Tue, 3 Nov 2020 15:43:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604418231; bh=4e34YoSQZfKQGC++UfxzX9Fq8PvFuEuaGRIiofRFo+Y=; h=From:To:Subject:Date:In-Reply-To:References:List-ID:From; b=i58yU+tzfQBfoKitOa/yWLmiS7qUW3rkRwLSDYgFule54mCsa5Ef4/5o7GNtwlcjL HOxPon/9f2bi7xPJiYROWY8+9PRM7gzZiQzjrOxFGVKAKlPg34fY3osh/jSY52kLaV iUs0xckEX0uPvJjPZm6EA6slbELMmwYhq0UxuZYU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728346AbgKCPnu (ORCPT ); Tue, 3 Nov 2020 10:43:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:39174 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728392AbgKCPnt (ORCPT ); Tue, 3 Nov 2020 10:43:49 -0500 Received: from localhost.localdomain (c-68-36-133-222.hsd1.mi.comcast.net [68.36.133.222]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 20D2920780 for ; Tue, 3 Nov 2020 15:43:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604418228; bh=4e34YoSQZfKQGC++UfxzX9Fq8PvFuEuaGRIiofRFo+Y=; h=From:To:Subject:Date:In-Reply-To:References:From; b=zFXodoh0lqHV80hB3FcGiI8Tq5UnehMPJ2o0uYUi9S3ka+1IDQiysmqOTqC5b6W+R BXx8+WZQ9S9Ggo1GhqC49sKf3w4ZnvrhHfbIOGv3xEI9bUsh6KvNWcWFjEPMSEZdGm O+SDY1bTjCriOoTMpXV/22o5LNQ9FWYq1C6+HRGo= From: trondmy@kernel.org To: linux-nfs@vger.kernel.org Subject: [PATCH v2 16/16] NFS: Improve handling of directory verifiers Date: Tue, 3 Nov 2020 10:33:29 -0500 Message-Id: <20201103153329.531942-17-trondmy@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201103153329.531942-16-trondmy@kernel.org> References: <20201103153329.531942-1-trondmy@kernel.org> <20201103153329.531942-2-trondmy@kernel.org> <20201103153329.531942-3-trondmy@kernel.org> <20201103153329.531942-4-trondmy@kernel.org> <20201103153329.531942-5-trondmy@kernel.org> <20201103153329.531942-6-trondmy@kernel.org> <20201103153329.531942-7-trondmy@kernel.org> <20201103153329.531942-8-trondmy@kernel.org> <20201103153329.531942-9-trondmy@kernel.org> <20201103153329.531942-10-trondmy@kernel.org> <20201103153329.531942-11-trondmy@kernel.org> <20201103153329.531942-12-trondmy@kernel.org> <20201103153329.531942-13-trondmy@kernel.org> <20201103153329.531942-14-trondmy@kernel.org> <20201103153329.531942-15-trondmy@kernel.org> <20201103153329.531942-16-trondmy@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org From: Trond Myklebust If the server insists on using the readdir verifiers in order to allow cookies to expire, then we should ensure that we cache the verifier with the cookie, so that we can return an error if the application tries to use the expired cookie. Signed-off-by: Trond Myklebust --- fs/nfs/dir.c | 35 +++++++++++++++++++++++------------ fs/nfs/inode.c | 7 ------- include/linux/nfs_fs.h | 8 +++++++- 3 files changed, 30 insertions(+), 20 deletions(-) diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 1c5a5f9cb228..0bd9cc625bdb 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -155,6 +155,7 @@ struct nfs_readdir_descriptor { loff_t current_index; loff_t prev_index; + __be32 verf[NFS_DIR_VERIFIER_SIZE]; unsigned long dir_verifier; unsigned long timestamp; unsigned long gencount; @@ -467,15 +468,15 @@ static int nfs_readdir_search_array(struct nfs_readdir_descriptor *desc) /* Fill a page with xdr information before transferring to the cache page */ static int nfs_readdir_xdr_filler(struct nfs_readdir_descriptor *desc, - u64 cookie, struct page **pages, - size_t bufsize) + __be32 *verf, u64 cookie, + struct page **pages, size_t bufsize, + __be32 *verf_res) { struct inode *inode = file_inode(desc->file); - __be32 verf_res[2]; struct nfs_readdir_arg arg = { .dentry = file_dentry(desc->file), .cred = desc->file->f_cred, - .verf = NFS_I(inode)->cookieverf, + .verf = verf, .cookie = cookie, .pages = pages, .page_len = bufsize, @@ -504,8 +505,6 @@ static int nfs_readdir_xdr_filler(struct nfs_readdir_descriptor *desc, } desc->timestamp = timestamp; desc->gencount = gencount; - memcpy(NFS_I(inode)->cookieverf, res.verf, - sizeof(NFS_I(inode)->cookieverf)); error: return error; } @@ -771,11 +770,13 @@ static struct page **nfs_readdir_alloc_pages(size_t npages) } static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc, - struct page *page, struct inode *inode) + struct page *page, __be32 *verf_arg, + __be32 *verf_res) { struct page **pages; struct nfs_entry *entry; size_t array_size; + struct inode *inode = file_inode(desc->file); size_t dtsize = NFS_SERVER(inode)->dtsize; int status = -ENOMEM; @@ -802,8 +803,9 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc, do { unsigned int pglen; - status = nfs_readdir_xdr_filler(desc, entry->cookie, - pages, dtsize); + status = nfs_readdir_xdr_filler(desc, verf_arg, entry->cookie, + pages, dtsize, + verf_res); if (status < 0) break; @@ -855,13 +857,15 @@ static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc) { struct inode *inode = file_inode(desc->file); struct nfs_inode *nfsi = NFS_I(inode); + __be32 verf[NFS_DIR_VERIFIER_SIZE]; int res; desc->page = nfs_readdir_page_get_cached(desc); if (!desc->page) return -ENOMEM; if (nfs_readdir_page_needs_filling(desc->page)) { - res = nfs_readdir_xdr_to_array(desc, desc->page, inode); + res = nfs_readdir_xdr_to_array(desc, desc->page, + nfsi->cookieverf, verf); if (res < 0) { nfs_readdir_page_unlock_and_put_cached(desc); if (res == -EBADCOOKIE || res == -ENOTSYNC) { @@ -871,6 +875,7 @@ static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc) } return res; } + memcpy(nfsi->cookieverf, verf, sizeof(nfsi->cookieverf)); } res = nfs_readdir_search_array(desc); if (res == 0) { @@ -903,6 +908,7 @@ static int readdir_search_pagecache(struct nfs_readdir_descriptor *desc) static void nfs_do_filldir(struct nfs_readdir_descriptor *desc) { struct file *file = desc->file; + struct nfs_inode *nfsi = NFS_I(file_inode(file)); struct nfs_cache_array *array; unsigned int i = 0; @@ -916,6 +922,7 @@ static void nfs_do_filldir(struct nfs_readdir_descriptor *desc) desc->eof = true; break; } + memcpy(desc->verf, nfsi->cookieverf, sizeof(desc->verf)); if (i < (array->size-1)) desc->dir_cookie = array->array[i+1].cookie; else @@ -950,8 +957,8 @@ static void nfs_do_filldir(struct nfs_readdir_descriptor *desc) static int uncached_readdir(struct nfs_readdir_descriptor *desc) { struct page *page = NULL; + __be32 verf[NFS_DIR_VERIFIER_SIZE]; int status; - struct inode *inode = file_inode(desc->file); dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", (unsigned long long)desc->dir_cookie); @@ -968,7 +975,7 @@ static int uncached_readdir(struct nfs_readdir_descriptor *desc) desc->duped = 0; nfs_readdir_page_init_array(page, desc->dir_cookie); - status = nfs_readdir_xdr_to_array(desc, page, inode); + status = nfs_readdir_xdr_to_array(desc, page, desc->verf, verf); if (status < 0) goto out_release; @@ -1024,6 +1031,7 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx) desc->dup_cookie = dir_ctx->dup_cookie; desc->duped = dir_ctx->duped; desc->attr_gencount = dir_ctx->attr_gencount; + memcpy(desc->verf, dir_ctx->verf, sizeof(desc->verf)); spin_unlock(&file->f_lock); do { @@ -1062,6 +1070,7 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx) dir_ctx->dup_cookie = desc->dup_cookie; dir_ctx->duped = desc->duped; dir_ctx->attr_gencount = desc->attr_gencount; + memcpy(dir_ctx->verf, desc->verf, sizeof(dir_ctx->verf)); spin_unlock(&file->f_lock); kfree(desc); @@ -1102,6 +1111,8 @@ static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) dir_ctx->dir_cookie = offset; else dir_ctx->dir_cookie = 0; + if (offset == 0) + memset(dir_ctx->verf, 0, sizeof(dir_ctx->verf)); dir_ctx->duped = 0; } spin_unlock(&filp->f_lock); diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index aa6493905bbe..9b765a900b28 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -229,7 +229,6 @@ static void nfs_zap_caches_locked(struct inode *inode) nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); nfsi->attrtimeo_timestamp = jiffies; - memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf)); if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | NFS_INO_INVALID_DATA @@ -1237,7 +1236,6 @@ EXPORT_SYMBOL_GPL(nfs_revalidate_inode); static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) { - struct nfs_inode *nfsi = NFS_I(inode); int ret; if (mapping->nrpages != 0) { @@ -1250,11 +1248,6 @@ static int nfs_invalidate_mapping(struct inode *inode, struct address_space *map if (ret < 0) return ret; } - if (S_ISDIR(inode->i_mode)) { - spin_lock(&inode->i_lock); - memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); - spin_unlock(&inode->i_lock); - } nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); nfs_fscache_wait_on_invalidate(inode); diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index dd6b463dda80..681ed98e4ba8 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -45,6 +45,11 @@ */ #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) +/* + * Size of the NFS directory verifier + */ +#define NFS_DIR_VERIFIER_SIZE 2 + /* * NFSv3/v4 Access mode cache entry */ @@ -89,6 +94,7 @@ struct nfs_open_context { struct nfs_open_dir_context { struct list_head list; unsigned long attr_gencount; + __be32 verf[NFS_DIR_VERIFIER_SIZE]; __u64 dir_cookie; __u64 dup_cookie; signed char duped; @@ -156,7 +162,7 @@ struct nfs_inode { * This is the cookie verifier used for NFSv3 readdir * operations */ - __be32 cookieverf[2]; + __be32 cookieverf[NFS_DIR_VERIFIER_SIZE]; atomic_long_t nrequests; struct nfs_mds_commit_info commit_info;