linuxdebug/fs/xfs/scrub/inode.c

629 lines
15 KiB
C

// 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)
{
int error;
/*
* Try to get the inode. If the verifiers fail, we try again
* in raw mode.
*/
error = xchk_get_inode(sc);
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;
uint32_t value = be32_to_cpu(dip->di_extsize);
fa = xfs_inode_validate_extsize(sc->mp, value, mode, flags);
if (fa)
xchk_ino_set_corrupt(sc, ino);
/*
* XFS allows a sysadmin to change the rt extent size when adding a rt
* section to a filesystem after formatting. If there are any
* directories with extszinherit and rtinherit set, the hint could
* become misaligned with the new rextsize. The verifier doesn't check
* this, because we allow rtinherit directories even without an rt
* device. Flag this as an administrative warning since we will clean
* this up eventually.
*/
if ((flags & XFS_DIFLAG_RTINHERIT) &&
(flags & XFS_DIFLAG_EXTSZINHERIT) &&
value % sc->mp->m_sb.sb_rextsize > 0)
xchk_ino_set_warning(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_has_reflink(mp))
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;
/* no bigtime iflag without the bigtime feature */
if (xfs_dinode_has_bigtime(dip) && !xfs_has_bigtime(mp))
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;
xfs_extnum_t nextents;
xfs_extnum_t naextents;
prid_t prid;
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);
prid = 0;
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_has_projid32(mp))
xchk_ino_set_corrupt(sc, ino);
prid = be16_to_cpu(dip->di_projid_lo);
break;
default:
xchk_ino_set_corrupt(sc, ino);
return;
}
if (xfs_has_projid32(mp))
prid |= (prid_t)be16_to_cpu(dip->di_projid_hi) << 16;
/*
* 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);
/*
* project id of -1 isn't supposed to be valid, but the kernel didn't
* always validate that.
*/
if (prid == -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);
nextents = xfs_dfork_data_extents(dip);
naextents = xfs_dfork_attr_extents(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 (naextents != 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 */
fork_recs = XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
switch (dip->di_aformat) {
case XFS_DINODE_FMT_EXTENTS:
if (naextents > fork_recs)
xchk_ino_set_corrupt(sc, ino);
break;
case XFS_DINODE_FMT_BTREE:
if (naextents <= fork_recs)
xchk_ino_set_corrupt(sc, ino);
break;
default:
if (naextents != 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 < 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;
}