/*
* Copyright (C) 2017 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#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_defer.h"
#include "xfs_btree.h"
#include "xfs_bit.h"
#include "xfs_log_format.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_inode.h"
#include "xfs_alloc.h"
#include "xfs_ialloc.h"
#include "xfs_ialloc_btree.h"
#include "xfs_icache.h"
#include "xfs_rmap.h"
#include "xfs_log.h"
#include "xfs_trans_priv.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/btree.h"
#include "scrub/trace.h"
/*
* Set us up to scrub inode btrees.
* If we detect a discrepancy between the inobt and the inode,
* try again after forcing logged inode cores out to disk.
*/
int
xfs_scrub_setup_ag_iallocbt(
struct xfs_scrub_context *sc,
struct xfs_inode *ip)
{
return xfs_scrub_setup_ag_btree(sc, ip, sc->try_harder);
}
/* Inode btree scrubber. */
/*
* If we're checking the finobt, cross-reference with the inobt.
* Otherwise we're checking the inobt; if there is an finobt, make sure
* we have a record or not depending on freecount.
*/
static inline void
xfs_scrub_iallocbt_chunk_xref_other(
struct xfs_scrub_context *sc,
struct xfs_inobt_rec_incore *irec,
xfs_agino_t agino)
{
struct xfs_btree_cur **pcur;
bool has_irec;
int error;
if (sc->sm->sm_type == XFS_SCRUB_TYPE_FINOBT)
pcur = &sc->sa.ino_cur;
else
pcur = &sc->sa.fino_cur;
if (!(*pcur))
return;
error = xfs_ialloc_has_inode_record(*pcur, agino, agino, &has_irec);
if (!xfs_scrub_should_check_xref(sc, &error, pcur))
return;
if (((irec->ir_freecount > 0 && !has_irec) ||
(irec->ir_freecount == 0 && has_irec)))
xfs_scrub_btree_xref_set_corrupt(sc, *pcur, 0);
}
/* Cross-reference with the other btrees. */
STATIC void
xfs_scrub_iallocbt_chunk_xref(
struct xfs_scrub_context *sc,
struct xfs_inobt_rec_incore *irec,
xfs_agino_t agino,
xfs_agblock_t agbno,
xfs_extlen_t len)
{
struct xfs_owner_info oinfo;
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return;
xfs_scrub_xref_is_used_space(sc, agbno, len);
xfs_scrub_iallocbt_chunk_xref_other(sc, irec, agino);
xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INODES);
xfs_scrub_xref_is_owned_by(sc, agbno, len, &oinfo);
xfs_scrub_xref_is_not_shared(sc, agbno, len);
}
/* Is this chunk worth checking? */
STATIC bool
xfs_scrub_iallocbt_chunk(
struct xfs_scrub_btree *bs,
struct xfs_inobt_rec_incore *irec,
xfs_agino_t agino,
xfs_extlen_t len)
{
struct xfs_mount *mp = bs->cur->bc_mp;
xfs_agnumber_t agno = bs->cur->bc_private.a.agno;
xfs_agblock_t bno;
bno = XFS_AGINO_TO_AGBNO(mp, agino);
if (bno + len <= bno ||
!xfs_verify_agbno(mp, agno, bno) ||
!xfs_verify_agbno(mp, agno, bno + len - 1))
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
xfs_scrub_iallocbt_chunk_xref(bs->sc, irec, agino, bno, len);
return true;
}
/* Count the number of free inodes. */
static unsigned int
xfs_scrub_iallocbt_freecount(
xfs_inofree_t freemask)
{
BUILD_BUG_ON(sizeof(freemask) != sizeof(__u64));
return hweight64(freemask);
}
/* Check a particular inode with ir_free. */
STATIC int
xfs_scrub_iallocbt_check_cluster_freemask(
struct xfs_scrub_btree *bs,
xfs_ino_t fsino,
xfs_agino_t chunkino,
xfs_agino_t clusterino,
struct xfs_inobt_rec_incore *irec,
struct xfs_buf *bp)
{
struct xfs_dinode *dip;
struct xfs_mount *mp = bs->cur->bc_mp;
bool inode_is_free = false;
bool freemask_ok;
bool inuse;
int error = 0;
if (xfs_scrub_should_terminate(bs->sc, &error))
return error;
dip = xfs_buf_offset(bp, clusterino * mp->m_sb.sb_inodesize);
if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC ||
(dip->di_version >= 3 &&
be64_to_cpu(dip->di_ino) != fsino + clusterino)) {
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
goto out;
}
if (irec->ir_free & XFS_INOBT_MASK(chunkino + clusterino))
inode_is_free = true;
error = xfs_icache_inode_is_allocated(mp, bs->cur->bc_tp,
fsino + clusterino, &inuse);
if (error == -ENODATA) {
/* Not cached, just read the disk buffer */
freemask_ok = inode_is_free ^ !!(dip->di_mode);
if (!bs->sc->try_harder && !freemask_ok)
return -EDEADLOCK;
} else if (error < 0) {
/*
* Inode is only half assembled, or there was an IO error,
* or the verifier failed, so don't bother trying to check.
* The inode scrubber can deal with this.
*/
goto out;
} else {
/* Inode is all there. */
freemask_ok = inode_is_free ^ inuse;
}
if (!freemask_ok)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
out:
return 0;
}
/* Make sure the free mask is consistent with what the inodes think. */
STATIC int
xfs_scrub_iallocbt_check_freemask(
struct xfs_scrub_btree *bs,
struct xfs_inobt_rec_incore *irec)
{
struct xfs_owner_info oinfo;
struct xfs_imap imap;
struct xfs_mount *mp = bs->cur->bc_mp;
struct xfs_dinode *dip;
struct xfs_buf *bp;
xfs_ino_t fsino;
xfs_agino_t nr_inodes;
xfs_agino_t agino;
xfs_agino_t chunkino;
xfs_agino_t clusterino;
xfs_agblock_t agbno;
int blks_per_cluster;
uint16_t holemask;
uint16_t ir_holemask;
int error = 0;
/* Make sure the freemask matches the inode records. */
blks_per_cluster = xfs_icluster_size_fsb(mp);
nr_inodes = XFS_OFFBNO_TO_AGINO(mp, blks_per_cluster, 0);
xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INODES);
for (agino = irec->ir_startino;
agino < irec->ir_startino + XFS_INODES_PER_CHUNK;
agino += blks_per_cluster * mp->m_sb.sb_inopblock) {
fsino = XFS_AGINO_TO_INO(mp, bs->cur->bc_private.a.agno, agino);
chunkino = agino - irec->ir_startino;
agbno = XFS_AGINO_TO_AGBNO(mp, agino);
/* Compute the holemask mask for this cluster. */
for (clusterino = 0, holemask = 0; clusterino < nr_inodes;
clusterino += XFS_INODES_PER_HOLEMASK_BIT)
holemask |= XFS_INOBT_MASK((chunkino + clusterino) /
XFS_INODES_PER_HOLEMASK_BIT);
/* The whole cluster must be a hole or not a hole. */
ir_holemask = (irec->ir_holemask & holemask);
if (ir_holemask != holemask && ir_holemask != 0) {
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
continue;
}
/* If any part of this is a hole, skip it. */
if (ir_holemask) {
xfs_scrub_xref_is_not_owned_by(bs->sc, agbno,
blks_per_cluster, &oinfo);
continue;
}
xfs_scrub_xref_is_owned_by(bs->sc, agbno, blks_per_cluster,
&oinfo);
/* Grab the inode cluster buffer. */
imap.im_blkno = XFS_AGB_TO_DADDR(mp, bs->cur->bc_private.a.agno,
agbno);
imap.im_len = XFS_FSB_TO_BB(mp, blks_per_cluster);
imap.im_boffset = 0;
error = xfs_imap_to_bp(mp, bs->cur->bc_tp, &imap,
&dip, &bp, 0, 0);
if (!xfs_scrub_btree_process_error(bs->sc, bs->cur, 0, &error))
continue;
/* Which inodes are free? */
for (clusterino = 0; clusterino < nr_inodes; clusterino++) {
error = xfs_scrub_iallocbt_check_cluster_freemask(bs,
fsino, chunkino, clusterino, irec, bp);
if (error) {
xfs_trans_brelse(bs->cur->bc_tp, bp);
return error;
}
}
xfs_trans_brelse(bs->cur->bc_tp, bp);
}
return error;
}
/* Scrub an inobt/finobt record. */
STATIC int
xfs_scrub_iallocbt_rec(
struct xfs_scrub_btree *bs,
union xfs_btree_rec *rec)
{
struct xfs_mount *mp = bs->cur->bc_mp;
xfs_filblks_t *inode_blocks = bs->private;
struct xfs_inobt_rec_incore irec;
uint64_t holes;
xfs_agnumber_t agno = bs->cur->bc_private.a.agno;
xfs_agino_t agino;
xfs_agblock_t agbno;
xfs_extlen_t len;
int holecount;
int i;
int error = 0;
unsigned int real_freecount;
uint16_t holemask;
xfs_inobt_btrec_to_irec(mp, rec, &irec);
if (irec.ir_count > XFS_INODES_PER_CHUNK ||
irec.ir_freecount > XFS_INODES_PER_CHUNK)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
real_freecount = irec.ir_freecount +
(XFS_INODES_PER_CHUNK - irec.ir_count);
if (real_freecount != xfs_scrub_iallocbt_freecount(irec.ir_free))
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
agino = irec.ir_startino;
/* Record has to be properly aligned within the AG. */
if (!xfs_verify_agino(mp, agno, agino) ||
!xfs_verify_agino(mp, agno, agino + XFS_INODES_PER_CHUNK - 1)) {
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
goto out;
}
/* Make sure this record is aligned to cluster and inoalignmnt size. */
agbno = XFS_AGINO_TO_AGBNO(mp, irec.ir_startino);
if ((agbno & (xfs_ialloc_cluster_alignment(mp) - 1)) ||
(agbno & (xfs_icluster_size_fsb(mp) - 1)))
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
*inode_blocks += XFS_B_TO_FSB(mp,
irec.ir_count * mp->m_sb.sb_inodesize);
/* Handle non-sparse inodes */
if (!xfs_inobt_issparse(irec.ir_holemask)) {
len = XFS_B_TO_FSB(mp,
XFS_INODES_PER_CHUNK * mp->m_sb.sb_inodesize);
if (irec.ir_count != XFS_INODES_PER_CHUNK)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
if (!xfs_scrub_iallocbt_chunk(bs, &irec, agino, len))
goto out;
goto check_freemask;
}
/* Check each chunk of a sparse inode cluster. */
holemask = irec.ir_holemask;
holecount = 0;
len = XFS_B_TO_FSB(mp,
XFS_INODES_PER_HOLEMASK_BIT * mp->m_sb.sb_inodesize);
holes = ~xfs_inobt_irec_to_allocmask(&irec);
if ((holes & irec.ir_free) != holes ||
irec.ir_freecount > irec.ir_count)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
for (i = 0; i < XFS_INOBT_HOLEMASK_BITS; i++) {
if (holemask & 1)
holecount += XFS_INODES_PER_HOLEMASK_BIT;
else if (!xfs_scrub_iallocbt_chunk(bs, &irec, agino, len))
break;
holemask >>= 1;
agino += XFS_INODES_PER_HOLEMASK_BIT;
}
if (holecount > XFS_INODES_PER_CHUNK ||
holecount + irec.ir_count != XFS_INODES_PER_CHUNK)
xfs_scrub_btree_set_corrupt(bs->sc, bs->cur, 0);
check_freemask:
error = xfs_scrub_iallocbt_check_freemask(bs, &irec);
if (error)
goto out;
out:
return error;
}
/*
* Make sure the inode btrees are as large as the rmap thinks they are.
* Don't bother if we're missing btree cursors, as we're already corrupt.
*/
STATIC void
xfs_scrub_iallocbt_xref_rmap_btreeblks(
struct xfs_scrub_context *sc,
int which)
{
struct xfs_owner_info oinfo;
xfs_filblks_t blocks;
xfs_extlen_t inobt_blocks = 0;
xfs_extlen_t finobt_blocks = 0;
int error;
if (!sc->sa.ino_cur || !sc->sa.rmap_cur ||
(xfs_sb_version_hasfinobt(&sc->mp->m_sb) && !sc->sa.fino_cur))
return;
/* Check that we saw as many inobt blocks as the rmap says. */
error = xfs_btree_count_blocks(sc->sa.ino_cur, &inobt_blocks);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.ino_cur))
return;
if (sc->sa.fino_cur) {
error = xfs_btree_count_blocks(sc->sa.fino_cur, &finobt_blocks);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.fino_cur))
return;
}
xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INOBT);
error = xfs_scrub_count_rmap_ownedby_ag(sc, sc->sa.rmap_cur, &oinfo,
&blocks);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.rmap_cur))
return;
if (blocks != inobt_blocks + finobt_blocks)
xfs_scrub_btree_set_corrupt(sc, sc->sa.ino_cur, 0);
}
/*
* Make sure that the inobt records point to the same number of blocks as
* the rmap says are owned by inodes.
*/
STATIC void
xfs_scrub_iallocbt_xref_rmap_inodes(
struct xfs_scrub_context *sc,
int which,
xfs_filblks_t inode_blocks)
{
struct xfs_owner_info oinfo;
xfs_filblks_t blocks;
int error;
if (!sc->sa.rmap_cur)
return;
/* Check that we saw as many inode blocks as the rmap knows about. */
xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INODES);
error = xfs_scrub_count_rmap_ownedby_ag(sc, sc->sa.rmap_cur, &oinfo,
&blocks);
if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.rmap_cur))
return;
if (blocks != inode_blocks)
xfs_scrub_btree_set_corrupt(sc, sc->sa.ino_cur, 0);
}
/* Scrub the inode btrees for some AG. */
STATIC int
xfs_scrub_iallocbt(
struct xfs_scrub_context *sc,
xfs_btnum_t which)
{
struct xfs_btree_cur *cur;
struct xfs_owner_info oinfo;
xfs_filblks_t inode_blocks = 0;
int error;
xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INOBT);
cur = which == XFS_BTNUM_INO ? sc->sa.ino_cur : sc->sa.fino_cur;
error = xfs_scrub_btree(sc, cur, xfs_scrub_iallocbt_rec, &oinfo,
&inode_blocks);
if (error)
return error;
xfs_scrub_iallocbt_xref_rmap_btreeblks(sc, which);
/*
* If we're scrubbing the inode btree, inode_blocks is the number of
* blocks pointed to by all the inode chunk records. Therefore, we
* should compare to the number of inode chunk blocks that the rmap
* knows about. We can't do this for the finobt since it only points
* to inode chunks with free inodes.
*/
if (which == XFS_BTNUM_INO)
xfs_scrub_iallocbt_xref_rmap_inodes(sc, which, inode_blocks);
return error;
}
int
xfs_scrub_inobt(
struct xfs_scrub_context *sc)
{
return xfs_scrub_iallocbt(sc, XFS_BTNUM_INO);
}
int
xfs_scrub_finobt(
struct xfs_scrub_context *sc)
{
return xfs_scrub_iallocbt(sc, XFS_BTNUM_FINO);
}
/* See if an inode btree has (or doesn't have) an inode chunk record. */
static inline void
xfs_scrub_xref_inode_check(
struct xfs_scrub_context *sc,
xfs_agblock_t agbno,
xfs_extlen_t len,
struct xfs_btree_cur **icur,
bool should_have_inodes)
{
bool has_inodes;
int error;
if (!(*icur))
return;
error = xfs_ialloc_has_inodes_at_extent(*icur, agbno, len, &has_inodes);
if (!xfs_scrub_should_check_xref(sc, &error, icur))
return;
if (has_inodes != should_have_inodes)
xfs_scrub_btree_xref_set_corrupt(sc, *icur, 0);
}
/* xref check that the extent is not covered by inodes */
void
xfs_scrub_xref_is_not_inode_chunk(
struct xfs_scrub_context *sc,
xfs_agblock_t agbno,
xfs_extlen_t len)
{
xfs_scrub_xref_inode_check(sc, agbno, len, &sc->sa.ino_cur, false);
xfs_scrub_xref_inode_check(sc, agbno, len, &sc->sa.fino_cur, false);
}
/* xref check that the extent is covered by inodes */
void
xfs_scrub_xref_is_inode_chunk(
struct xfs_scrub_context *sc,
xfs_agblock_t agbno,
xfs_extlen_t len)
{
xfs_scrub_xref_inode_check(sc, agbno, len, &sc->sa.ino_cur, true);
}
