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![Chandan Babu R](/assets/img/avatar_default.png)
This commit replaces the macro XFS_DFORK_NEXTENTS() with the helper function xfs_dfork_nextents(). As of this commit, xfs_dfork_nextents() returns the same value as XFS_DFORK_NEXTENTS(). A future commit which extends inode's extent counter fields will add more logic to this helper. This commit also replaces direct accesses to xfs_dinode->di_[a]nextents with calls to xfs_dfork_nextents(). No functional changes have been made. Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
628 lines
15 KiB
C
628 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_btree.h"
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#include "xfs_log_format.h"
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#include "xfs_inode.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_util.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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/*
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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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{
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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);
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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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uint32_t value = be32_to_cpu(dip->di_extsize);
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fa = xfs_inode_validate_extsize(sc->mp, value, 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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* XFS allows a sysadmin to change the rt extent size when adding a rt
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* section to a filesystem after formatting. If there are any
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* directories with extszinherit and rtinherit set, the hint could
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* become misaligned with the new rextsize. The verifier doesn't check
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* this, because we allow rtinherit directories even without an rt
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* device. Flag this as an administrative warning since we will clean
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* this up eventually.
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*/
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if ((flags & XFS_DIFLAG_RTINHERIT) &&
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(flags & XFS_DIFLAG_EXTSZINHERIT) &&
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value % sc->mp->m_sb.sb_rextsize > 0)
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xchk_ino_set_warning(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) && !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_has_reflink(mp))
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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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/* no bigtime iflag without the bigtime feature */
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if (xfs_dinode_has_bigtime(dip) && !xfs_has_bigtime(mp))
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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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static inline void
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xchk_dinode_nsec(
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struct xfs_scrub *sc,
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xfs_ino_t ino,
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struct xfs_dinode *dip,
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const xfs_timestamp_t ts)
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{
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struct timespec64 tv;
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tv = xfs_inode_from_disk_ts(dip, ts);
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if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC)
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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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xfs_extnum_t nextents;
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xfs_extnum_t naextents;
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prid_t prid;
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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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prid = 0;
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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_has_projid32(mp))
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xchk_ino_set_corrupt(sc, ino);
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prid = be16_to_cpu(dip->di_projid_lo);
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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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if (xfs_has_projid32(mp))
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prid |= (prid_t)be16_to_cpu(dip->di_projid_hi) << 16;
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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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/*
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* project id of -1 isn't supposed to be valid, but the kernel didn't
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* always validate that.
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*/
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if (prid == -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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xchk_dinode_nsec(sc, ino, dip, dip->di_atime);
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xchk_dinode_nsec(sc, ino, dip, dip->di_mtime);
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xchk_dinode_nsec(sc, ino, dip, dip->di_ctime);
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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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nextents = xfs_dfork_data_extents(dip);
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naextents = xfs_dfork_attr_extents(dip);
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/* 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 (naextents != 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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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 (naextents > 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 (naextents <= 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 (naextents != 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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xchk_dinode_nsec(sc, ino, dip, dip->di_crtime);
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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))
|
|
return;
|
|
|
|
agino = XFS_INO_TO_AGINO(sc->mp, ino);
|
|
|
|
/*
|
|
* Try to get the finobt record. If we can't get it, then we're
|
|
* in good shape.
|
|
*/
|
|
error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE,
|
|
&has_record);
|
|
if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
|
|
!has_record)
|
|
return;
|
|
|
|
error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record);
|
|
if (!xchk_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
|
|
!has_record)
|
|
return;
|
|
|
|
/*
|
|
* Otherwise, make sure this record either doesn't cover this inode,
|
|
* or that it does but it's marked present.
|
|
*/
|
|
if (rec.ir_startino > agino ||
|
|
rec.ir_startino + XFS_INODES_PER_CHUNK <= agino)
|
|
return;
|
|
|
|
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 < xfs_dfork_data_extents(dip))
|
|
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 != xfs_dfork_attr_extents(dip))
|
|
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_existing(sc, agno, &sc->sa);
|
|
if (!xchk_xref_process_error(sc, agno, agbno, &error))
|
|
goto out_free;
|
|
|
|
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);
|
|
|
|
out_free:
|
|
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_has_reflink(mp))
|
|
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;
|
|
}
|