From patchwork Sat Jan 21 08:03:38 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. Wong" X-Patchwork-Id: 9529929 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 169A06020B for ; Sat, 21 Jan 2017 08:03:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 051B528427 for ; Sat, 21 Jan 2017 08:03:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EC36828698; Sat, 21 Jan 2017 08:03:43 +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=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY 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 483FE28427 for ; Sat, 21 Jan 2017 08:03:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751178AbdAUIDm (ORCPT ); Sat, 21 Jan 2017 03:03:42 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:25194 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750886AbdAUIDm (ORCPT ); Sat, 21 Jan 2017 03:03:42 -0500 Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v0L83eiv020752 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sat, 21 Jan 2017 08:03:41 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0021.oracle.com (8.13.8/8.14.4) with ESMTP id v0L83enC011426 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sat, 21 Jan 2017 08:03:40 GMT Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id v0L83dp0024805; Sat, 21 Jan 2017 08:03:40 GMT Received: from localhost (/24.21.211.40) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sat, 21 Jan 2017 00:03:39 -0800 Subject: [PATCH 30/55] xfs: scrub symbolic links From: "Darrick J. Wong" To: darrick.wong@oracle.com Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Date: Sat, 21 Jan 2017 00:03:38 -0800 Message-ID: <148498581836.15323.1917083539546274542.stgit@birch.djwong.org> In-Reply-To: <148498561504.15323.8531512066874274553.stgit@birch.djwong.org> References: <148498561504.15323.8531512066874274553.stgit@birch.djwong.org> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Create the infrastructure to scrub symbolic link data. Signed-off-by: Darrick J. Wong --- fs/xfs/Makefile | 1 fs/xfs/libxfs/xfs_fs.h | 3 + fs/xfs/scrub/common.c | 1 fs/xfs/scrub/common.h | 5 ++ fs/xfs/scrub/symlink.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_trace.h | 3 + 6 files changed, 118 insertions(+), 2 deletions(-) create mode 100644 fs/xfs/scrub/symlink.c -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index d723ebc..5035ee0 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -116,6 +116,7 @@ xfs-$(CONFIG_XFS_DEBUG) += $(addprefix scrub/, \ inode.o \ refcount.o \ rmap.o \ + symlink.o \ ) # low-level transaction/log code diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index 6d5bfbd..5484c26 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -591,7 +591,8 @@ struct xfs_scrub_metadata { #define XFS_SCRUB_TYPE_BMBTC 14 /* CoW fork block mapping */ #define XFS_SCRUB_TYPE_DIR 15 /* directory */ #define XFS_SCRUB_TYPE_XATTR 16 /* extended attribute */ -#define XFS_SCRUB_TYPE_MAX 16 +#define XFS_SCRUB_TYPE_SYMLINK 17 /* symbolic link */ +#define XFS_SCRUB_TYPE_MAX 17 #define XFS_SCRUB_FLAG_REPAIR 0x01 /* i: repair this metadata */ #define XFS_SCRUB_FLAG_CORRUPT 0x02 /* o: needs repair */ diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c index b68dd74..0b55933 100644 --- a/fs/xfs/scrub/common.c +++ b/fs/xfs/scrub/common.c @@ -689,6 +689,7 @@ static const struct xfs_scrub_meta_fns meta_scrub_fns[] = { {xfs_scrub_setup_inode_bmap, xfs_scrub_bmap_cow, NULL, NULL}, {xfs_scrub_setup_inode, xfs_scrub_directory, NULL, NULL}, {xfs_scrub_setup_inode_xattr, xfs_scrub_xattr, NULL, NULL}, + {xfs_scrub_setup_inode_symlink, xfs_scrub_symlink, NULL, NULL}, }; /* Dispatch metadata scrubbing. */ diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h index 0f3ffd7..123dc1d 100644 --- a/fs/xfs/scrub/common.h +++ b/fs/xfs/scrub/common.h @@ -231,6 +231,10 @@ int xfs_scrub_setup_inode_xattr(struct xfs_scrub_context *sc, struct xfs_inode *ip, struct xfs_scrub_metadata *sm, bool retry_deadlocked); +int xfs_scrub_setup_inode_symlink(struct xfs_scrub_context *sc, + struct xfs_inode *ip, + struct xfs_scrub_metadata *sm, + bool retry_deadlocked); /* Metadata scrubbers */ @@ -250,5 +254,6 @@ int xfs_scrub_bmap_attr(struct xfs_scrub_context *sc); int xfs_scrub_bmap_cow(struct xfs_scrub_context *sc); int xfs_scrub_directory(struct xfs_scrub_context *sc); int xfs_scrub_xattr(struct xfs_scrub_context *sc); +int xfs_scrub_symlink(struct xfs_scrub_context *sc); #endif /* __XFS_REPAIR_COMMON_H__ */ diff --git a/fs/xfs/scrub/symlink.c b/fs/xfs/scrub/symlink.c new file mode 100644 index 0000000..80a1e70 --- /dev/null +++ b/fs/xfs/scrub/symlink.c @@ -0,0 +1,107 @@ +/* + * Copyright (C) 2017 Oracle. All Rights Reserved. + * + * Author: Darrick J. Wong + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_defer.h" +#include "xfs_btree.h" +#include "xfs_bit.h" +#include "xfs_log_format.h" +#include "xfs_trans.h" +#include "xfs_trace.h" +#include "xfs_sb.h" +#include "xfs_inode.h" +#include "xfs_inode_fork.h" +#include "xfs_symlink.h" +#include "scrub/common.h" + +/* Set us up with an inode and a buffer for reading symlink targets. */ +int +xfs_scrub_setup_inode_symlink( + struct xfs_scrub_context *sc, + struct xfs_inode *ip, + struct xfs_scrub_metadata *sm, + bool retry_deadlocked) +{ + void *buf; + int error; + + /* Allocate the buffer without the inode lock held. */ + buf = kmem_zalloc_large(MAXPATHLEN + 1, KM_SLEEP); + if (!buf) + return -ENOMEM; + + error = xfs_scrub_setup_inode(sc, ip, sm, retry_deadlocked); + if (error) { + kmem_free(buf); + return error; + } + + sc->buf = buf; + return 0; +} + +/* Symbolic links. */ + +#define XFS_SCRUB_SYMLINK_CHECK(fs_ok) \ + XFS_SCRUB_INO_CHECK(sc, ip->i_ino, NULL, "symlink", fs_ok) +#define XFS_SCRUB_SYMLINK_GOTO(fs_ok, label) \ + XFS_SCRUB_INO_GOTO(sc, ip->i_ino, NULL, "symlink", fs_ok, label) +int +xfs_scrub_symlink( + struct xfs_scrub_context *sc) +{ + struct xfs_inode *ip = sc->ip; + struct xfs_ifork *ifp; + loff_t len; + int error = 0; + + if (!S_ISLNK(VFS_I(ip)->i_mode)) + return -ENOENT; + ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); + len = ip->i_d.di_size; + + /* Plausible size? */ + XFS_SCRUB_SYMLINK_GOTO(len <= MAXPATHLEN, out); + + /* Inline symlink? */ + if (ifp->if_flags & XFS_IFINLINE) { + XFS_SCRUB_SYMLINK_GOTO(len > 0, out); + XFS_SCRUB_SYMLINK_CHECK(len <= XFS_IFORK_DSIZE(ip)); + XFS_SCRUB_SYMLINK_CHECK(len <= strnlen(ifp->if_u1.if_data, + XFS_IFORK_DSIZE(ip))); + goto out; + } + + /* Remote symlink; must read. */ + xfs_iunlock(sc->ip, XFS_ILOCK_EXCL); + error = xfs_readlink(sc->ip, sc->buf); + xfs_ilock(sc->ip, XFS_ILOCK_EXCL); + XFS_SCRUB_FILE_OP_ERROR_GOTO(sc, XFS_DATA_FORK, 0, "symlink", + &error, out); + XFS_SCRUB_SYMLINK_CHECK(len <= strnlen(sc->buf, MAXPATHLEN)); +out: + return error; +} +#undef XFS_SCRUB_SYMLINK_GOTO +#undef XFS_SCRUB_SYMLINK_CHECK diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 760552d..87fd942 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -3369,7 +3369,8 @@ DEFINE_GETFSMAP_EVENT(xfs_getfsmap_mapping); { XFS_SCRUB_TYPE_BMBTA, "bmapbta" }, \ { XFS_SCRUB_TYPE_BMBTC, "bmapbtc" }, \ { XFS_SCRUB_TYPE_DIR, "dir" }, \ - { XFS_SCRUB_TYPE_XATTR, "xattr" } + { XFS_SCRUB_TYPE_XATTR, "xattr" }, \ + { XFS_SCRUB_TYPE_SYMLINK, "symlink" } DECLARE_EVENT_CLASS(xfs_scrub_class, TP_PROTO(struct xfs_inode *ip, int type, xfs_agnumber_t agno, xfs_ino_t inum, unsigned int gen, unsigned int flags,