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![Darrick J. Wong](/assets/img/avatar_default.png)
Owner information for static fs metadata can be defined readonly at build time because it never changes across filesystems. This enables us to reduce stack usage (particularly in scrub) because we can use the statically defined oinfo structures. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
599 lines
15 KiB
C
599 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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 "xfs_rmap.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.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/btree.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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xchk_setup_inode(
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struct xfs_scrub *sc,
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struct xfs_inode *ip)
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{
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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 = xchk_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 xchk_trans_alloc(sc, 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 = xchk_trans_alloc(sc, 0);
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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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/* Validate di_extsize hint. */
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STATIC void
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xchk_inode_extsize(
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struct xfs_scrub *sc,
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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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xfs_failaddr_t fa;
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fa = xfs_inode_validate_extsize(sc->mp, be32_to_cpu(dip->di_extsize),
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mode, flags);
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if (fa)
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xchk_ino_set_corrupt(sc, ino);
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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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xchk_inode_cowextsize(
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struct xfs_scrub *sc,
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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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xfs_failaddr_t fa;
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fa = xfs_inode_validate_cowextsize(sc->mp,
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be32_to_cpu(dip->di_cowextsize), mode, flags,
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flags2);
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if (fa)
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xchk_ino_set_corrupt(sc, ino);
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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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xchk_inode_flags(
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struct xfs_scrub *sc,
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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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/* di_flags are all taken, last bit cannot be used */
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_inode_flags2(
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struct xfs_scrub *sc,
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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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/* Unknown di_flags2 could be from a future kernel */
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if (flags2 & ~XFS_DIFLAG2_ANY)
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xchk_ino_set_warning(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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}
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/* Scrub all the ondisk inode fields. */
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STATIC void
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xchk_dinode(
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struct xfs_scrub *sc,
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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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switch (mode & S_IFMT) {
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case S_IFLNK:
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case S_IFREG:
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case S_IFDIR:
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case S_IFCHR:
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case S_IFBLK:
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case S_IFIFO:
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case S_IFSOCK:
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/* mode is recognized */
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break;
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default:
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xchk_ino_set_corrupt(sc, ino);
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break;
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}
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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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xchk_ino_set_preen(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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if (dip->di_mode == 0 && sc->ip)
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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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break;
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default:
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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_warning(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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break;
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case XFS_DINODE_FMT_UUID:
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default:
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xchk_ino_set_corrupt(sc, ino);
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break;
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}
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/* di_[amc]time.nsec */
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if (be32_to_cpu(dip->di_atime.t_nsec) >= NSEC_PER_SEC)
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xchk_ino_set_corrupt(sc, ino);
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if (be32_to_cpu(dip->di_mtime.t_nsec) >= NSEC_PER_SEC)
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xchk_ino_set_corrupt(sc, ino);
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if (be32_to_cpu(dip->di_ctime.t_nsec) >= NSEC_PER_SEC)
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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_warning(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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}
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xchk_inode_flags(sc, dip, ino, mode, flags);
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xchk_inode_extsize(sc, 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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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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break;
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default:
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if (nextents != 0)
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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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if (dip->di_anextents != 0 && dip->di_forkoff == 0)
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xchk_ino_set_corrupt(sc, ino);
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if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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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:
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if (nextents > fork_recs)
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xchk_ino_set_corrupt(sc, ino);
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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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xchk_ino_set_corrupt(sc, ino);
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break;
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default:
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if (nextents != 0)
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xchk_ino_set_corrupt(sc, ino);
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}
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if (dip->di_version >= 3) {
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if (be32_to_cpu(dip->di_crtime.t_nsec) >= NSEC_PER_SEC)
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xchk_ino_set_corrupt(sc, ino);
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xchk_inode_flags2(sc, dip, ino, mode, flags, flags2);
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xchk_inode_cowextsize(sc, dip, ino, mode, flags,
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flags2);
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}
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}
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/*
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* Make sure the finobt doesn't think this inode is free.
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* We don't have to check the inobt ourselves because we got the inode via
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* IGET_UNTRUSTED, which checks the inobt for us.
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*/
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static void
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xchk_inode_xref_finobt(
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struct xfs_scrub *sc,
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xfs_ino_t ino)
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{
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struct xfs_inobt_rec_incore rec;
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xfs_agino_t agino;
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int has_record;
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int error;
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if (!sc->sa.fino_cur || xchk_skip_xref(sc->sm))
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return;
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agino = XFS_INO_TO_AGINO(sc->mp, ino);
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/*
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* Try to get the finobt record. If we can't get it, then we're
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* in good shape.
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*/
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error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE,
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&has_record);
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if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
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!has_record)
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return;
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error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record);
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if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
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!has_record)
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return;
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/*
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* Otherwise, make sure this record either doesn't cover this inode,
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* or that it does but it's marked present.
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*/
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if (rec.ir_startino > agino ||
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rec.ir_startino + XFS_INODES_PER_CHUNK <= agino)
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return;
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if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino))
|
|
xchk_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0);
|
|
}
|
|
|
|
/* Cross reference the inode fields with the forks. */
|
|
STATIC void
|
|
xchk_inode_xref_bmap(
|
|
struct xfs_scrub *sc,
|
|
struct xfs_dinode *dip)
|
|
{
|
|
xfs_extnum_t nextents;
|
|
xfs_filblks_t count;
|
|
xfs_filblks_t acount;
|
|
int error;
|
|
|
|
if (xchk_skip_xref(sc->sm))
|
|
return;
|
|
|
|
/* Walk all the extents to check nextents/naextents/nblocks. */
|
|
error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK,
|
|
&nextents, &count);
|
|
if (!xchk_should_check_xref(sc, &error, NULL))
|
|
return;
|
|
if (nextents < be32_to_cpu(dip->di_nextents))
|
|
xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
|
|
|
|
error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK,
|
|
&nextents, &acount);
|
|
if (!xchk_should_check_xref(sc, &error, NULL))
|
|
return;
|
|
if (nextents != be16_to_cpu(dip->di_anextents))
|
|
xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
|
|
|
|
/* Check nblocks against the inode. */
|
|
if (count + acount != be64_to_cpu(dip->di_nblocks))
|
|
xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);
|
|
}
|
|
|
|
/* Cross-reference with the other btrees. */
|
|
STATIC void
|
|
xchk_inode_xref(
|
|
struct xfs_scrub *sc,
|
|
xfs_ino_t ino,
|
|
struct xfs_dinode *dip)
|
|
{
|
|
xfs_agnumber_t agno;
|
|
xfs_agblock_t agbno;
|
|
int error;
|
|
|
|
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
return;
|
|
|
|
agno = XFS_INO_TO_AGNO(sc->mp, ino);
|
|
agbno = XFS_INO_TO_AGBNO(sc->mp, ino);
|
|
|
|
error = xchk_ag_init(sc, agno, &sc->sa);
|
|
if (!xchk_xref_process_error(sc, agno, agbno, &error))
|
|
return;
|
|
|
|
xchk_xref_is_used_space(sc, agbno, 1);
|
|
xchk_inode_xref_finobt(sc, ino);
|
|
xchk_xref_is_owned_by(sc, agbno, 1, &XFS_RMAP_OINFO_INODES);
|
|
xchk_xref_is_not_shared(sc, agbno, 1);
|
|
xchk_inode_xref_bmap(sc, dip);
|
|
|
|
xchk_ag_free(sc, &sc->sa);
|
|
}
|
|
|
|
/*
|
|
* If the reflink iflag disagrees with a scan for shared data fork extents,
|
|
* either flag an error (shared extents w/ no flag) or a preen (flag set w/o
|
|
* any shared extents). We already checked for reflink iflag set on a non
|
|
* reflink filesystem.
|
|
*/
|
|
static void
|
|
xchk_inode_check_reflink_iflag(
|
|
struct xfs_scrub *sc,
|
|
xfs_ino_t ino)
|
|
{
|
|
struct xfs_mount *mp = sc->mp;
|
|
bool has_shared;
|
|
int error;
|
|
|
|
if (!xfs_sb_version_hasreflink(&mp->m_sb))
|
|
return;
|
|
|
|
error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
|
|
&has_shared);
|
|
if (!xchk_xref_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
|
|
XFS_INO_TO_AGBNO(mp, ino), &error))
|
|
return;
|
|
if (xfs_is_reflink_inode(sc->ip) && !has_shared)
|
|
xchk_ino_set_preen(sc, ino);
|
|
else if (!xfs_is_reflink_inode(sc->ip) && has_shared)
|
|
xchk_ino_set_corrupt(sc, ino);
|
|
}
|
|
|
|
/* Scrub an inode. */
|
|
int
|
|
xchk_inode(
|
|
struct xfs_scrub *sc)
|
|
{
|
|
struct xfs_dinode di;
|
|
int error = 0;
|
|
|
|
/*
|
|
* If sc->ip is NULL, that means that the setup function called
|
|
* xfs_iget to look up the inode. xfs_iget returned a EFSCORRUPTED
|
|
* and a NULL inode, so flag the corruption error and return.
|
|
*/
|
|
if (!sc->ip) {
|
|
xchk_ino_set_corrupt(sc, sc->sm->sm_ino);
|
|
return 0;
|
|
}
|
|
|
|
/* Scrub the inode core. */
|
|
xfs_inode_to_disk(sc->ip, &di, 0);
|
|
xchk_dinode(sc, &di, sc->ip->i_ino);
|
|
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
|
|
goto out;
|
|
|
|
/*
|
|
* Look for discrepancies between file's data blocks and the reflink
|
|
* iflag. We already checked the iflag against the file mode when
|
|
* we scrubbed the dinode.
|
|
*/
|
|
if (S_ISREG(VFS_I(sc->ip)->i_mode))
|
|
xchk_inode_check_reflink_iflag(sc, sc->ip->i_ino);
|
|
|
|
xchk_inode_xref(sc, sc->ip->i_ino, &di);
|
|
out:
|
|
return error;
|
|
}
|