forked from Minki/linux
2a721dbbc8
Create the infrastructure to scrub symbolic link data. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_defer.h"
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#include "xfs_btree.h"
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#include "xfs_bit.h"
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#include "xfs_log_format.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_inode.h"
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#include "xfs_inode_fork.h"
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#include "xfs_symlink.h"
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#include "scrub/xfs_scrub.h"
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#include "scrub/scrub.h"
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#include "scrub/common.h"
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#include "scrub/trace.h"
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/* Set us up to scrub a symbolic link. */
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int
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xfs_scrub_setup_symlink(
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struct xfs_scrub_context *sc,
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struct xfs_inode *ip)
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{
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/* Allocate the buffer without the inode lock held. */
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sc->buf = kmem_zalloc_large(XFS_SYMLINK_MAXLEN + 1, KM_SLEEP);
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if (!sc->buf)
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return -ENOMEM;
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return xfs_scrub_setup_inode_contents(sc, ip, 0);
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}
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/* Symbolic links. */
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int
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xfs_scrub_symlink(
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struct xfs_scrub_context *sc)
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{
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struct xfs_inode *ip = sc->ip;
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struct xfs_ifork *ifp;
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loff_t len;
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int error = 0;
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if (!S_ISLNK(VFS_I(ip)->i_mode))
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return -ENOENT;
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ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
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len = ip->i_d.di_size;
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/* Plausible size? */
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if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
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goto out;
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}
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/* Inline symlink? */
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if (ifp->if_flags & XFS_IFINLINE) {
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if (len > XFS_IFORK_DSIZE(ip) ||
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len > strnlen(ifp->if_u1.if_data, XFS_IFORK_DSIZE(ip)))
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
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goto out;
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}
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/* Remote symlink; must read the contents. */
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error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
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if (!xfs_scrub_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
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goto out;
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if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
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xfs_scrub_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
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out:
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return error;
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}
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