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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (C) 2017-2023 Oracle. All Rights Reserved.4 * Author: Darrick J. Wong <djwong@kernel.org>5 */6#include "xfs.h"7#include "xfs_fs.h"8#include "xfs_shared.h"9#include "xfs_format.h"10#include "xfs_trans_resv.h"11#include "xfs_mount.h"12#include "xfs_log_format.h"13#include "xfs_trans.h"14#include "xfs_inode.h"15#include "xfs_symlink.h"16#include "xfs_health.h"17#include "xfs_symlink_remote.h"18#include "scrub/scrub.h"19#include "scrub/common.h"20#include "scrub/health.h"21#include "scrub/repair.h"22 23/* Set us up to scrub a symbolic link. */24int25xchk_setup_symlink(26 struct xfs_scrub *sc)27{28 unsigned int resblks = 0;29 int error;30 31 /* Allocate the buffer without the inode lock held. */32 sc->buf = kvzalloc(XFS_SYMLINK_MAXLEN + 1, XCHK_GFP_FLAGS);33 if (!sc->buf)34 return -ENOMEM;35 36 if (xchk_could_repair(sc)) {37 error = xrep_setup_symlink(sc, &resblks);38 if (error)39 return error;40 }41 42 return xchk_setup_inode_contents(sc, resblks);43}44 45/* Symbolic links. */46 47int48xchk_symlink(49 struct xfs_scrub *sc)50{51 struct xfs_inode *ip = sc->ip;52 struct xfs_ifork *ifp;53 loff_t len;54 int error = 0;55 56 if (!S_ISLNK(VFS_I(ip)->i_mode))57 return -ENOENT;58 59 if (xchk_file_looks_zapped(sc, XFS_SICK_INO_SYMLINK_ZAPPED)) {60 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);61 return 0;62 }63 64 ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);65 len = ip->i_disk_size;66 67 /* Plausible size? */68 if (len > XFS_SYMLINK_MAXLEN || len <= 0) {69 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);70 return 0;71 }72 73 /* Inline symlink? */74 if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {75 if (len > xfs_inode_data_fork_size(ip) ||76 len > strnlen(ifp->if_data, xfs_inode_data_fork_size(ip)))77 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);78 return 0;79 }80 81 /* Remote symlink; must read the contents. */82 error = xfs_symlink_remote_read(sc->ip, sc->buf);83 if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))84 return error;85 if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)86 xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);87 88 /* If a remote symlink is clean, it is clearly not zapped. */89 xchk_mark_healthy_if_clean(sc, XFS_SICK_INO_SYMLINK_ZAPPED);90 return 0;91}92