// SPDX-License-Identifier: GPL-2.0+
|
/*
|
* Copyright (C) 2017 Oracle. All Rights Reserved.
|
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
*/
|
#include "xfs.h"
|
#include "xfs_fs.h"
|
#include "xfs_shared.h"
|
#include "xfs_format.h"
|
#include "xfs_trans_resv.h"
|
#include "xfs_mount.h"
|
#include "xfs_btree.h"
|
#include "xfs_log_format.h"
|
#include "xfs_inode.h"
|
#include "xfs_ialloc.h"
|
#include "xfs_da_format.h"
|
#include "xfs_reflink.h"
|
#include "xfs_rmap.h"
|
#include "xfs_bmap_util.h"
|
#include "scrub/scrub.h"
|
#include "scrub/common.h"
|
#include "scrub/btree.h"
|
|
/*
|
* Grab total control of the inode metadata. It doesn't matter here if
|
* the file data is still changing; exclusive access to the metadata is
|
* the goal.
|
*/
|
int
|
xchk_setup_inode(
|
struct xfs_scrub *sc,
|
struct xfs_inode *ip)
|
{
|
int error;
|
|
/*
|
* Try to get the inode. If the verifiers fail, we try again
|
* in raw mode.
|
*/
|
error = xchk_get_inode(sc, ip);
|
switch (error) {
|
case 0:
|
break;
|
case -EFSCORRUPTED:
|
case -EFSBADCRC:
|
return xchk_trans_alloc(sc, 0);
|
default:
|
return error;
|
}
|
|
/* Got the inode, lock it and we're ready to go. */
|
sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
|
xfs_ilock(sc->ip, sc->ilock_flags);
|
error = xchk_trans_alloc(sc, 0);
|
if (error)
|
goto out;
|
sc->ilock_flags |= XFS_ILOCK_EXCL;
|
xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
|
|
out:
|
/* scrub teardown will unlock and release the inode for us */
|
return error;
|
}
|
|
/* Inode core */
|
|
/* Validate di_extsize hint. */
|
STATIC void
|
xchk_inode_extsize(
|
struct xfs_scrub *sc,
|
struct xfs_dinode *dip,
|
xfs_ino_t ino,
|
uint16_t mode,
|
uint16_t flags)
|
{
|
xfs_failaddr_t fa;
|
|
fa = xfs_inode_validate_extsize(sc->mp, be32_to_cpu(dip->di_extsize),
|
mode, flags);
|
if (fa)
|
xchk_ino_set_corrupt(sc, ino);
|
}
|
|
/*
|
* Validate di_cowextsize hint.
|
*
|
* The rules are documented at xfs_ioctl_setattr_check_cowextsize().
|
* These functions must be kept in sync with each other.
|
*/
|
STATIC void
|
xchk_inode_cowextsize(
|
struct xfs_scrub *sc,
|
struct xfs_dinode *dip,
|
xfs_ino_t ino,
|
uint16_t mode,
|
uint16_t flags,
|
uint64_t flags2)
|
{
|
xfs_failaddr_t fa;
|
|
fa = xfs_inode_validate_cowextsize(sc->mp,
|
be32_to_cpu(dip->di_cowextsize), mode, flags,
|
flags2);
|
if (fa)
|
xchk_ino_set_corrupt(sc, ino);
|
}
|
|
/* Make sure the di_flags make sense for the inode. */
|
STATIC void
|
xchk_inode_flags(
|
struct xfs_scrub *sc,
|
struct xfs_dinode *dip,
|
xfs_ino_t ino,
|
uint16_t mode,
|
uint16_t flags)
|
{
|
struct xfs_mount *mp = sc->mp;
|
|
/* di_flags are all taken, last bit cannot be used */
|
if (flags & ~XFS_DIFLAG_ANY)
|
goto bad;
|
|
/* rt flags require rt device */
|
if ((flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
|
goto bad;
|
|
/* new rt bitmap flag only valid for rbmino */
|
if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino)
|
goto bad;
|
|
/* directory-only flags */
|
if ((flags & (XFS_DIFLAG_RTINHERIT |
|
XFS_DIFLAG_EXTSZINHERIT |
|
XFS_DIFLAG_PROJINHERIT |
|
XFS_DIFLAG_NOSYMLINKS)) &&
|
!S_ISDIR(mode))
|
goto bad;
|
|
/* file-only flags */
|
if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) &&
|
!S_ISREG(mode))
|
goto bad;
|
|
/* filestreams and rt make no sense */
|
if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME))
|
goto bad;
|
|
return;
|
bad:
|
xchk_ino_set_corrupt(sc, ino);
|
}
|
|
/* Make sure the di_flags2 make sense for the inode. */
|
STATIC void
|
xchk_inode_flags2(
|
struct xfs_scrub *sc,
|
struct xfs_dinode *dip,
|
xfs_ino_t ino,
|
uint16_t mode,
|
uint16_t flags,
|
uint64_t flags2)
|
{
|
struct xfs_mount *mp = sc->mp;
|
|
/* Unknown di_flags2 could be from a future kernel */
|
if (flags2 & ~XFS_DIFLAG2_ANY)
|
xchk_ino_set_warning(sc, ino);
|
|
/* reflink flag requires reflink feature */
|
if ((flags2 & XFS_DIFLAG2_REFLINK) &&
|
!xfs_sb_version_hasreflink(&mp->m_sb))
|
goto bad;
|
|
/* cowextsize flag is checked w.r.t. mode separately */
|
|
/* file/dir-only flags */
|
if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode)))
|
goto bad;
|
|
/* file-only flags */
|
if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode))
|
goto bad;
|
|
/* realtime and reflink make no sense, currently */
|
if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK))
|
goto bad;
|
|
/* dax and reflink make no sense, currently */
|
if ((flags2 & XFS_DIFLAG2_DAX) && (flags2 & XFS_DIFLAG2_REFLINK))
|
goto bad;
|
|
/* no bigtime iflag without the bigtime feature */
|
if (xfs_dinode_has_bigtime(dip) &&
|
!xfs_sb_version_hasbigtime(&mp->m_sb))
|
goto bad;
|
|
return;
|
bad:
|
xchk_ino_set_corrupt(sc, ino);
|
}
|
|
static inline void
|
xchk_dinode_nsec(
|
struct xfs_scrub *sc,
|
xfs_ino_t ino,
|
struct xfs_dinode *dip,
|
const xfs_timestamp_t ts)
|
{
|
struct timespec64 tv;
|
|
tv = xfs_inode_from_disk_ts(dip, ts);
|
if (tv.tv_nsec < 0 || tv.tv_nsec >= NSEC_PER_SEC)
|
xchk_ino_set_corrupt(sc, ino);
|
}
|
|
/* Scrub all the ondisk inode fields. */
|
STATIC void
|
xchk_dinode(
|
struct xfs_scrub *sc,
|
struct xfs_dinode *dip,
|
xfs_ino_t ino)
|
{
|
struct xfs_mount *mp = sc->mp;
|
size_t fork_recs;
|
unsigned long long isize;
|
uint64_t flags2;
|
uint32_t nextents;
|
uint16_t flags;
|
uint16_t mode;
|
|
flags = be16_to_cpu(dip->di_flags);
|
if (dip->di_version >= 3)
|
flags2 = be64_to_cpu(dip->di_flags2);
|
else
|
flags2 = 0;
|
|
/* di_mode */
|
mode = be16_to_cpu(dip->di_mode);
|
switch (mode & S_IFMT) {
|
case S_IFLNK:
|
case S_IFREG:
|
case S_IFDIR:
|
case S_IFCHR:
|
case S_IFBLK:
|
case S_IFIFO:
|
case S_IFSOCK:
|
/* mode is recognized */
|
break;
|
default:
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
}
|
|
/* v1/v2 fields */
|
switch (dip->di_version) {
|
case 1:
|
/*
|
* We autoconvert v1 inodes into v2 inodes on writeout,
|
* so just mark this inode for preening.
|
*/
|
xchk_ino_set_preen(sc, ino);
|
break;
|
case 2:
|
case 3:
|
if (dip->di_onlink != 0)
|
xchk_ino_set_corrupt(sc, ino);
|
|
if (dip->di_mode == 0 && sc->ip)
|
xchk_ino_set_corrupt(sc, ino);
|
|
if (dip->di_projid_hi != 0 &&
|
!xfs_sb_version_hasprojid32bit(&mp->m_sb))
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
default:
|
xchk_ino_set_corrupt(sc, ino);
|
return;
|
}
|
|
/*
|
* di_uid/di_gid -- -1 isn't invalid, but there's no way that
|
* userspace could have created that.
|
*/
|
if (dip->di_uid == cpu_to_be32(-1U) ||
|
dip->di_gid == cpu_to_be32(-1U))
|
xchk_ino_set_warning(sc, ino);
|
|
/* di_format */
|
switch (dip->di_format) {
|
case XFS_DINODE_FMT_DEV:
|
if (!S_ISCHR(mode) && !S_ISBLK(mode) &&
|
!S_ISFIFO(mode) && !S_ISSOCK(mode))
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
case XFS_DINODE_FMT_LOCAL:
|
if (!S_ISDIR(mode) && !S_ISLNK(mode))
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
case XFS_DINODE_FMT_EXTENTS:
|
if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
case XFS_DINODE_FMT_BTREE:
|
if (!S_ISREG(mode) && !S_ISDIR(mode))
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
case XFS_DINODE_FMT_UUID:
|
default:
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
}
|
|
/* di_[amc]time.nsec */
|
xchk_dinode_nsec(sc, ino, dip, dip->di_atime);
|
xchk_dinode_nsec(sc, ino, dip, dip->di_mtime);
|
xchk_dinode_nsec(sc, ino, dip, dip->di_ctime);
|
|
/*
|
* di_size. xfs_dinode_verify checks for things that screw up
|
* the VFS such as the upper bit being set and zero-length
|
* symlinks/directories, but we can do more here.
|
*/
|
isize = be64_to_cpu(dip->di_size);
|
if (isize & (1ULL << 63))
|
xchk_ino_set_corrupt(sc, ino);
|
|
/* Devices, fifos, and sockets must have zero size */
|
if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0)
|
xchk_ino_set_corrupt(sc, ino);
|
|
/* Directories can't be larger than the data section size (32G) */
|
if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE))
|
xchk_ino_set_corrupt(sc, ino);
|
|
/* Symlinks can't be larger than SYMLINK_MAXLEN */
|
if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN))
|
xchk_ino_set_corrupt(sc, ino);
|
|
/*
|
* Warn if the running kernel can't handle the kinds of offsets
|
* needed to deal with the file size. In other words, if the
|
* pagecache can't cache all the blocks in this file due to
|
* overly large offsets, flag the inode for admin review.
|
*/
|
if (isize >= mp->m_super->s_maxbytes)
|
xchk_ino_set_warning(sc, ino);
|
|
/* di_nblocks */
|
if (flags2 & XFS_DIFLAG2_REFLINK) {
|
; /* nblocks can exceed dblocks */
|
} else if (flags & XFS_DIFLAG_REALTIME) {
|
/*
|
* nblocks is the sum of data extents (in the rtdev),
|
* attr extents (in the datadev), and both forks' bmbt
|
* blocks (in the datadev). This clumsy check is the
|
* best we can do without cross-referencing with the
|
* inode forks.
|
*/
|
if (be64_to_cpu(dip->di_nblocks) >=
|
mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks)
|
xchk_ino_set_corrupt(sc, ino);
|
} else {
|
if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks)
|
xchk_ino_set_corrupt(sc, ino);
|
}
|
|
xchk_inode_flags(sc, dip, ino, mode, flags);
|
|
xchk_inode_extsize(sc, dip, ino, mode, flags);
|
|
/* di_nextents */
|
nextents = be32_to_cpu(dip->di_nextents);
|
fork_recs = XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
|
switch (dip->di_format) {
|
case XFS_DINODE_FMT_EXTENTS:
|
if (nextents > fork_recs)
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
case XFS_DINODE_FMT_BTREE:
|
if (nextents <= fork_recs)
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
default:
|
if (nextents != 0)
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
}
|
|
/* di_forkoff */
|
if (XFS_DFORK_APTR(dip) >= (char *)dip + mp->m_sb.sb_inodesize)
|
xchk_ino_set_corrupt(sc, ino);
|
if (dip->di_anextents != 0 && dip->di_forkoff == 0)
|
xchk_ino_set_corrupt(sc, ino);
|
if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
|
xchk_ino_set_corrupt(sc, ino);
|
|
/* di_aformat */
|
if (dip->di_aformat != XFS_DINODE_FMT_LOCAL &&
|
dip->di_aformat != XFS_DINODE_FMT_EXTENTS &&
|
dip->di_aformat != XFS_DINODE_FMT_BTREE)
|
xchk_ino_set_corrupt(sc, ino);
|
|
/* di_anextents */
|
nextents = be16_to_cpu(dip->di_anextents);
|
fork_recs = XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
|
switch (dip->di_aformat) {
|
case XFS_DINODE_FMT_EXTENTS:
|
if (nextents > fork_recs)
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
case XFS_DINODE_FMT_BTREE:
|
if (nextents <= fork_recs)
|
xchk_ino_set_corrupt(sc, ino);
|
break;
|
default:
|
if (nextents != 0)
|
xchk_ino_set_corrupt(sc, ino);
|
}
|
|
if (dip->di_version >= 3) {
|
xchk_dinode_nsec(sc, ino, dip, dip->di_crtime);
|
xchk_inode_flags2(sc, dip, ino, mode, flags, flags2);
|
xchk_inode_cowextsize(sc, dip, ino, mode, flags,
|
flags2);
|
}
|
}
|
|
/*
|
* Make sure the finobt doesn't think this inode is free.
|
* We don't have to check the inobt ourselves because we got the inode via
|
* IGET_UNTRUSTED, which checks the inobt for us.
|
*/
|
static void
|
xchk_inode_xref_finobt(
|
struct xfs_scrub *sc,
|
xfs_ino_t ino)
|
{
|
struct xfs_inobt_rec_incore rec;
|
xfs_agino_t agino;
|
int has_record;
|
int error;
|
|
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 < 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;
|
}
|
