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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2017-2023 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#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_log_format.h"
#include "xfs_trans.h"
#include "xfs_inode.h"
#include "xfs_symlink.h"
#include "xfs_health.h"
#include "xfs_symlink_remote.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/health.h"
#include "scrub/repair.h"
/* Set us up to scrub a symbolic link. */
int
xchk_setup_symlink(
struct xfs_scrub *sc)
{
unsigned int resblks = 0;
int error;
/* Allocate the buffer without the inode lock held. */
sc->buf = kvzalloc(XFS_SYMLINK_MAXLEN + 1, XCHK_GFP_FLAGS);
if (!sc->buf)
return -ENOMEM;
if (xchk_could_repair(sc)) {
error = xrep_setup_symlink(sc, &resblks);
if (error)
return error;
}
return xchk_setup_inode_contents(sc, resblks);
}
/* Symbolic links. */
int
xchk_symlink(
struct xfs_scrub *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;
if (xchk_file_looks_zapped(sc, XFS_SICK_INO_SYMLINK_ZAPPED)) {
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
return 0;
}
ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
len = ip->i_disk_size;
/* Plausible size? */
if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
return 0;
}
/* Inline symlink? */
if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
if (len > xfs_inode_data_fork_size(ip) ||
len > strnlen(ifp->if_data, xfs_inode_data_fork_size(ip)))
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
return 0;
}
/* Remote symlink; must read the contents. */
error = xfs_symlink_remote_read(sc->ip, sc->buf);
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
return error;
if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
/* If a remote symlink is clean, it is clearly not zapped. */
xchk_mark_healthy_if_clean(sc, XFS_SICK_INO_SYMLINK_ZAPPED);
return 0;
}
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