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80e4e12688
Scrub the fields within an inode. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
612 lines
15 KiB
C
612 lines
15 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_icache.h"
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#include "xfs_inode_buf.h"
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#include "xfs_inode_fork.h"
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#include "xfs_ialloc.h"
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#include "xfs_da_format.h"
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#include "xfs_reflink.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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/*
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* Grab total control of the inode metadata. It doesn't matter here if
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* the file data is still changing; exclusive access to the metadata is
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* the goal.
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*/
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int
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xfs_scrub_setup_inode(
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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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struct xfs_mount *mp = sc->mp;
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int error;
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/*
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* Try to get the inode. If the verifiers fail, we try again
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* in raw mode.
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*/
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error = xfs_scrub_get_inode(sc, ip);
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switch (error) {
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case 0:
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break;
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case -EFSCORRUPTED:
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case -EFSBADCRC:
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return 0;
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default:
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return error;
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}
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/* Got the inode, lock it and we're ready to go. */
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sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
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xfs_ilock(sc->ip, sc->ilock_flags);
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error = xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
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if (error)
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goto out;
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sc->ilock_flags |= XFS_ILOCK_EXCL;
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xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
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out:
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/* scrub teardown will unlock and release the inode for us */
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return error;
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}
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/* Inode core */
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/*
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* Validate di_extsize hint.
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*
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* The rules are documented at xfs_ioctl_setattr_check_extsize().
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* These functions must be kept in sync with each other.
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*/
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STATIC void
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xfs_scrub_inode_extsize(
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struct xfs_scrub_context *sc,
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struct xfs_buf *bp,
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struct xfs_dinode *dip,
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xfs_ino_t ino,
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uint16_t mode,
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uint16_t flags)
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{
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struct xfs_mount *mp = sc->mp;
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bool rt_flag;
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bool hint_flag;
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bool inherit_flag;
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uint32_t extsize;
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uint32_t extsize_bytes;
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uint32_t blocksize_bytes;
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rt_flag = (flags & XFS_DIFLAG_REALTIME);
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hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
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inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
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extsize = be32_to_cpu(dip->di_extsize);
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extsize_bytes = XFS_FSB_TO_B(sc->mp, extsize);
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if (rt_flag)
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blocksize_bytes = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
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else
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blocksize_bytes = mp->m_sb.sb_blocksize;
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if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
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goto bad;
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if (hint_flag && !S_ISREG(mode))
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goto bad;
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if (inherit_flag && !S_ISDIR(mode))
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goto bad;
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if ((hint_flag || inherit_flag) && extsize == 0)
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goto bad;
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if (!(hint_flag || inherit_flag) && extsize != 0)
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goto bad;
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if (extsize_bytes % blocksize_bytes)
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goto bad;
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if (extsize > MAXEXTLEN)
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goto bad;
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if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
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goto bad;
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return;
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bad:
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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}
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/*
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* Validate di_cowextsize hint.
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*
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* The rules are documented at xfs_ioctl_setattr_check_cowextsize().
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* These functions must be kept in sync with each other.
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*/
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STATIC void
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xfs_scrub_inode_cowextsize(
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struct xfs_scrub_context *sc,
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struct xfs_buf *bp,
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struct xfs_dinode *dip,
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xfs_ino_t ino,
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uint16_t mode,
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uint16_t flags,
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uint64_t flags2)
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{
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struct xfs_mount *mp = sc->mp;
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bool rt_flag;
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bool hint_flag;
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uint32_t extsize;
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uint32_t extsize_bytes;
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rt_flag = (flags & XFS_DIFLAG_REALTIME);
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hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
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extsize = be32_to_cpu(dip->di_cowextsize);
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extsize_bytes = XFS_FSB_TO_B(sc->mp, extsize);
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if (hint_flag && !xfs_sb_version_hasreflink(&mp->m_sb))
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goto bad;
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if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
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goto bad;
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if (hint_flag && extsize == 0)
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goto bad;
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if (!hint_flag && extsize != 0)
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goto bad;
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if (hint_flag && rt_flag)
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goto bad;
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if (extsize_bytes % mp->m_sb.sb_blocksize)
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goto bad;
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if (extsize > MAXEXTLEN)
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goto bad;
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if (extsize > mp->m_sb.sb_agblocks / 2)
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goto bad;
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return;
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bad:
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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}
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/* Make sure the di_flags make sense for the inode. */
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STATIC void
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xfs_scrub_inode_flags(
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struct xfs_scrub_context *sc,
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struct xfs_buf *bp,
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struct xfs_dinode *dip,
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xfs_ino_t ino,
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uint16_t mode,
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uint16_t flags)
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{
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struct xfs_mount *mp = sc->mp;
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if (flags & ~XFS_DIFLAG_ANY)
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goto bad;
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/* rt flags require rt device */
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if ((flags & (XFS_DIFLAG_REALTIME | XFS_DIFLAG_RTINHERIT)) &&
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!mp->m_rtdev_targp)
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goto bad;
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/* new rt bitmap flag only valid for rbmino */
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if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino)
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goto bad;
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/* directory-only flags */
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if ((flags & (XFS_DIFLAG_RTINHERIT |
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XFS_DIFLAG_EXTSZINHERIT |
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XFS_DIFLAG_PROJINHERIT |
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XFS_DIFLAG_NOSYMLINKS)) &&
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!S_ISDIR(mode))
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goto bad;
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/* file-only flags */
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if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) &&
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!S_ISREG(mode))
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goto bad;
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/* filestreams and rt make no sense */
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if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME))
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goto bad;
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return;
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bad:
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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}
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/* Make sure the di_flags2 make sense for the inode. */
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STATIC void
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xfs_scrub_inode_flags2(
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struct xfs_scrub_context *sc,
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struct xfs_buf *bp,
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struct xfs_dinode *dip,
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xfs_ino_t ino,
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uint16_t mode,
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uint16_t flags,
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uint64_t flags2)
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{
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struct xfs_mount *mp = sc->mp;
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if (flags2 & ~XFS_DIFLAG2_ANY)
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goto bad;
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/* reflink flag requires reflink feature */
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if ((flags2 & XFS_DIFLAG2_REFLINK) &&
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!xfs_sb_version_hasreflink(&mp->m_sb))
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goto bad;
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/* cowextsize flag is checked w.r.t. mode separately */
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/* file/dir-only flags */
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if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode)))
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goto bad;
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/* file-only flags */
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if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode))
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goto bad;
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/* realtime and reflink make no sense, currently */
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if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK))
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goto bad;
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/* dax and reflink make no sense, currently */
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if ((flags2 & XFS_DIFLAG2_DAX) && (flags2 & XFS_DIFLAG2_REFLINK))
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goto bad;
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return;
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bad:
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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}
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/* Scrub all the ondisk inode fields. */
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STATIC void
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xfs_scrub_dinode(
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struct xfs_scrub_context *sc,
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struct xfs_buf *bp,
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struct xfs_dinode *dip,
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xfs_ino_t ino)
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{
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struct xfs_mount *mp = sc->mp;
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size_t fork_recs;
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unsigned long long isize;
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uint64_t flags2;
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uint32_t nextents;
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uint16_t flags;
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uint16_t mode;
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flags = be16_to_cpu(dip->di_flags);
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if (dip->di_version >= 3)
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flags2 = be64_to_cpu(dip->di_flags2);
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else
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flags2 = 0;
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/* di_mode */
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mode = be16_to_cpu(dip->di_mode);
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if (mode & ~(S_IALLUGO | S_IFMT))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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/* v1/v2 fields */
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switch (dip->di_version) {
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case 1:
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/*
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* We autoconvert v1 inodes into v2 inodes on writeout,
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* so just mark this inode for preening.
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*/
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xfs_scrub_ino_set_preen(sc, bp);
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break;
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case 2:
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case 3:
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if (dip->di_onlink != 0)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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if (dip->di_mode == 0 && sc->ip)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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if (dip->di_projid_hi != 0 &&
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!xfs_sb_version_hasprojid32bit(&mp->m_sb))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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default:
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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return;
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}
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/*
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* di_uid/di_gid -- -1 isn't invalid, but there's no way that
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* userspace could have created that.
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*/
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if (dip->di_uid == cpu_to_be32(-1U) ||
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dip->di_gid == cpu_to_be32(-1U))
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xfs_scrub_ino_set_warning(sc, bp);
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/* di_format */
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switch (dip->di_format) {
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case XFS_DINODE_FMT_DEV:
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if (!S_ISCHR(mode) && !S_ISBLK(mode) &&
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!S_ISFIFO(mode) && !S_ISSOCK(mode))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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case XFS_DINODE_FMT_LOCAL:
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if (!S_ISDIR(mode) && !S_ISLNK(mode))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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case XFS_DINODE_FMT_EXTENTS:
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if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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case XFS_DINODE_FMT_BTREE:
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if (!S_ISREG(mode) && !S_ISDIR(mode))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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case XFS_DINODE_FMT_UUID:
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default:
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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}
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/*
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* di_size. xfs_dinode_verify checks for things that screw up
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* the VFS such as the upper bit being set and zero-length
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* symlinks/directories, but we can do more here.
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*/
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isize = be64_to_cpu(dip->di_size);
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if (isize & (1ULL << 63))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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/* Devices, fifos, and sockets must have zero size */
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if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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/* Directories can't be larger than the data section size (32G) */
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if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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/* Symlinks can't be larger than SYMLINK_MAXLEN */
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if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN))
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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/*
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* Warn if the running kernel can't handle the kinds of offsets
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* needed to deal with the file size. In other words, if the
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* pagecache can't cache all the blocks in this file due to
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* overly large offsets, flag the inode for admin review.
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*/
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if (isize >= mp->m_super->s_maxbytes)
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xfs_scrub_ino_set_warning(sc, bp);
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/* di_nblocks */
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if (flags2 & XFS_DIFLAG2_REFLINK) {
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; /* nblocks can exceed dblocks */
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} else if (flags & XFS_DIFLAG_REALTIME) {
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/*
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* nblocks is the sum of data extents (in the rtdev),
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* attr extents (in the datadev), and both forks' bmbt
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* blocks (in the datadev). This clumsy check is the
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* best we can do without cross-referencing with the
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* inode forks.
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*/
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if (be64_to_cpu(dip->di_nblocks) >=
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mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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} else {
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if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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}
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xfs_scrub_inode_flags(sc, bp, dip, ino, mode, flags);
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xfs_scrub_inode_extsize(sc, bp, dip, ino, mode, flags);
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/* di_nextents */
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nextents = be32_to_cpu(dip->di_nextents);
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fork_recs = XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
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switch (dip->di_format) {
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case XFS_DINODE_FMT_EXTENTS:
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if (nextents > fork_recs)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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case XFS_DINODE_FMT_BTREE:
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if (nextents <= fork_recs)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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default:
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if (nextents != 0)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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break;
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}
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/* di_forkoff */
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if (XFS_DFORK_APTR(dip) >= (char *)dip + mp->m_sb.sb_inodesize)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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if (dip->di_anextents != 0 && dip->di_forkoff == 0)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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/* di_aformat */
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if (dip->di_aformat != XFS_DINODE_FMT_LOCAL &&
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dip->di_aformat != XFS_DINODE_FMT_EXTENTS &&
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dip->di_aformat != XFS_DINODE_FMT_BTREE)
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xfs_scrub_ino_set_corrupt(sc, ino, bp);
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/* di_anextents */
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nextents = be16_to_cpu(dip->di_anextents);
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fork_recs = XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
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switch (dip->di_aformat) {
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case XFS_DINODE_FMT_EXTENTS:
|
|
if (nextents > fork_recs)
|
|
xfs_scrub_ino_set_corrupt(sc, ino, bp);
|
|
break;
|
|
case XFS_DINODE_FMT_BTREE:
|
|
if (nextents <= fork_recs)
|
|
xfs_scrub_ino_set_corrupt(sc, ino, bp);
|
|
break;
|
|
default:
|
|
if (nextents != 0)
|
|
xfs_scrub_ino_set_corrupt(sc, ino, bp);
|
|
}
|
|
|
|
if (dip->di_version >= 3) {
|
|
xfs_scrub_inode_flags2(sc, bp, dip, ino, mode, flags, flags2);
|
|
xfs_scrub_inode_cowextsize(sc, bp, dip, ino, mode, flags,
|
|
flags2);
|
|
}
|
|
}
|
|
|
|
/* Map and read a raw inode. */
|
|
STATIC int
|
|
xfs_scrub_inode_map_raw(
|
|
struct xfs_scrub_context *sc,
|
|
xfs_ino_t ino,
|
|
struct xfs_buf **bpp,
|
|
struct xfs_dinode **dipp)
|
|
{
|
|
struct xfs_imap imap;
|
|
struct xfs_mount *mp = sc->mp;
|
|
struct xfs_buf *bp = NULL;
|
|
struct xfs_dinode *dip;
|
|
int error;
|
|
|
|
error = xfs_imap(mp, sc->tp, ino, &imap, XFS_IGET_UNTRUSTED);
|
|
if (error == -EINVAL) {
|
|
/*
|
|
* Inode could have gotten deleted out from under us;
|
|
* just forget about it.
|
|
*/
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
|
|
XFS_INO_TO_AGBNO(mp, ino), &error))
|
|
goto out;
|
|
|
|
error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
|
|
imap.im_blkno, imap.im_len, XBF_UNMAPPED, &bp,
|
|
NULL);
|
|
if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
|
|
XFS_INO_TO_AGBNO(mp, ino), &error))
|
|
goto out;
|
|
|
|
/*
|
|
* Is this really an inode? We disabled verifiers in the above
|
|
* xfs_trans_read_buf call because the inode buffer verifier
|
|
* fails on /any/ inode record in the inode cluster with a bad
|
|
* magic or version number, not just the one that we're
|
|
* checking. Therefore, grab the buffer unconditionally, attach
|
|
* the inode verifiers by hand, and run the inode verifier only
|
|
* on the one inode we want.
|
|
*/
|
|
bp->b_ops = &xfs_inode_buf_ops;
|
|
dip = xfs_buf_offset(bp, imap.im_boffset);
|
|
if (!xfs_dinode_verify(mp, ino, dip) ||
|
|
!xfs_dinode_good_version(mp, dip->di_version)) {
|
|
xfs_scrub_ino_set_corrupt(sc, ino, bp);
|
|
goto out_buf;
|
|
}
|
|
|
|
/* ...and is it the one we asked for? */
|
|
if (be32_to_cpu(dip->di_gen) != sc->sm->sm_gen) {
|
|
error = -ENOENT;
|
|
goto out_buf;
|
|
}
|
|
|
|
*dipp = dip;
|
|
*bpp = bp;
|
|
out:
|
|
return error;
|
|
out_buf:
|
|
xfs_trans_brelse(sc->tp, bp);
|
|
return error;
|
|
}
|
|
|
|
/* Scrub an inode. */
|
|
int
|
|
xfs_scrub_inode(
|
|
struct xfs_scrub_context *sc)
|
|
{
|
|
struct xfs_dinode di;
|
|
struct xfs_mount *mp = sc->mp;
|
|
struct xfs_buf *bp = NULL;
|
|
struct xfs_dinode *dip;
|
|
xfs_ino_t ino;
|
|
|
|
bool has_shared;
|
|
int error = 0;
|
|
|
|
/* Did we get the in-core inode, or are we doing this manually? */
|
|
if (sc->ip) {
|
|
ino = sc->ip->i_ino;
|
|
xfs_inode_to_disk(sc->ip, &di, 0);
|
|
dip = &di;
|
|
} else {
|
|
/* Map & read inode. */
|
|
ino = sc->sm->sm_ino;
|
|
error = xfs_scrub_inode_map_raw(sc, ino, &bp, &dip);
|
|
if (error || !bp)
|
|
goto out;
|
|
}
|
|
|
|
xfs_scrub_dinode(sc, bp, dip, ino);
|
|
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
goto out;
|
|
|
|
/* Now let's do the things that require a live inode. */
|
|
if (!sc->ip)
|
|
goto out;
|
|
|
|
/*
|
|
* Does this inode have the reflink flag set but no shared extents?
|
|
* Set the preening flag if this is the case.
|
|
*/
|
|
if (xfs_is_reflink_inode(sc->ip)) {
|
|
error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
|
|
&has_shared);
|
|
if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
|
|
XFS_INO_TO_AGBNO(mp, ino), &error))
|
|
goto out;
|
|
if (!has_shared)
|
|
xfs_scrub_ino_set_preen(sc, bp);
|
|
}
|
|
|
|
out:
|
|
if (bp)
|
|
xfs_trans_brelse(sc->tp, bp);
|
|
return error;
|
|
}
|