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/*
* Copyright (C) 2017 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* 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_sb.h"
#include "xfs_inode.h"
#include "xfs_inode_fork.h"
#include "xfs_symlink.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/trace.h"
/* Set us up to scrub a symbolic link. */
int
xfs_scrub_setup_symlink(
struct xfs_scrub_context *sc,
struct xfs_inode *ip)
{
/* Allocate the buffer without the inode lock held. */
sc->buf = kmem_zalloc_large(XFS_SYMLINK_MAXLEN + 1, KM_SLEEP);
if (!sc->buf)
return -ENOMEM;
return xfs_scrub_setup_inode_contents(sc, ip, 0);
}
/* Symbolic links. */
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? */
if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
goto out;
}
/* Inline symlink? */
if (ifp->if_flags & XFS_IFINLINE) {
if (len > XFS_IFORK_DSIZE(ip) ||
len > strnlen(ifp->if_u1.if_data, XFS_IFORK_DSIZE(ip)))
xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
goto out;
}
/* Remote symlink; must read the contents. */
error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
goto out;
if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
out:
return error;
}
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