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626 lines
15 KiB
626 lines
15 KiB
// 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 <[email protected]> |
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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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/* |
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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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/* |
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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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|
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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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|
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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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|
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/* Inode core */ |
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|
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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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|
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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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/* |
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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/* cowextsize flag is checked w.r.t. mode separately */ |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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prid_t prid; |
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uint16_t flags; |
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uint16_t mode; |
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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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/* |
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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xchk_inode_flags(sc, dip, ino, mode, flags); |
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|
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xchk_inode_extsize(sc, dip, ino, mode, flags); |
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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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|
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if (!sc->sa.fino_cur || xchk_skip_xref(sc->sm)) |
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return; |
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|
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agino = XFS_INO_TO_AGINO(sc->mp, ino); |
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|
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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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|
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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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/* |
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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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|
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if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino)) |
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xchk_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0); |
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} |
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|
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/* Cross reference the inode fields with the forks. */ |
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STATIC void |
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xchk_inode_xref_bmap( |
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struct xfs_scrub *sc, |
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struct xfs_dinode *dip) |
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{ |
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xfs_extnum_t nextents; |
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xfs_filblks_t count; |
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xfs_filblks_t acount; |
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int error; |
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|
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if (xchk_skip_xref(sc->sm)) |
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return; |
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|
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/* Walk all the extents to check nextents/naextents/nblocks. */ |
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error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK, |
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&nextents, &count); |
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if (!xchk_should_check_xref(sc, &error, NULL)) |
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return; |
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if (nextents < be32_to_cpu(dip->di_nextents)) |
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xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino); |
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|
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error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK, |
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&nextents, &acount); |
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if (!xchk_should_check_xref(sc, &error, NULL)) |
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return; |
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if (nextents != be16_to_cpu(dip->di_anextents)) |
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xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino); |
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|
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/* Check nblocks against the inode. */ |
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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; |
|
}
|
|
|