linux-stable/fs/xfs/scrub/bmap.c
Darrick J. Wong 166d76410d xfs: introduce scrubber cross-referencing stubs
Create some stubs that will be used to cross-reference metadata records.
The actual cross-referencing will be filled in by subsequent patches.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
2018-01-17 21:00:45 -08:00

389 lines
10 KiB
C

/*
* 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_inode_fork.h"
#include "xfs_alloc.h"
#include "xfs_rtalloc.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_bmap_btree.h"
#include "xfs_rmap.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 with an inode's bmap. */
int
xfs_scrub_setup_inode_bmap(
struct xfs_scrub_context *sc,
struct xfs_inode *ip)
{
struct xfs_mount *mp = sc->mp;
int error;
error = xfs_scrub_get_inode(sc, ip);
if (error)
goto out;
sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
xfs_ilock(sc->ip, sc->ilock_flags);
/*
* We don't want any ephemeral data fork updates sitting around
* while we inspect block mappings, so wait for directio to finish
* and flush dirty data if we have delalloc reservations.
*/
if (S_ISREG(VFS_I(sc->ip)->i_mode) &&
sc->sm->sm_type == XFS_SCRUB_TYPE_BMBTD) {
inode_dio_wait(VFS_I(sc->ip));
error = filemap_write_and_wait(VFS_I(sc->ip)->i_mapping);
if (error)
goto out;
}
/* Got the inode, lock it and we're ready to go. */
error = xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
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 */
return error;
}
/*
* Inode fork block mapping (BMBT) scrubber.
* More complex than the others because we have to scrub
* all the extents regardless of whether or not the fork
* is in btree format.
*/
struct xfs_scrub_bmap_info {
struct xfs_scrub_context *sc;
xfs_fileoff_t lastoff;
bool is_rt;
bool is_shared;
int whichfork;
};
/* Cross-reference a single rtdev extent record. */
STATIC void
xfs_scrub_bmap_rt_extent_xref(
struct xfs_scrub_bmap_info *info,
struct xfs_inode *ip,
struct xfs_btree_cur *cur,
struct xfs_bmbt_irec *irec)
{
if (info->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return;
}
/* Cross-reference a single datadev extent record. */
STATIC void
xfs_scrub_bmap_extent_xref(
struct xfs_scrub_bmap_info *info,
struct xfs_inode *ip,
struct xfs_btree_cur *cur,
struct xfs_bmbt_irec *irec)
{
if (info->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
return;
}
/* Scrub a single extent record. */
STATIC int
xfs_scrub_bmap_extent(
struct xfs_inode *ip,
struct xfs_btree_cur *cur,
struct xfs_scrub_bmap_info *info,
struct xfs_bmbt_irec *irec)
{
struct xfs_mount *mp = info->sc->mp;
struct xfs_buf *bp = NULL;
int error = 0;
if (cur)
xfs_btree_get_block(cur, 0, &bp);
/*
* Check for out-of-order extents. This record could have come
* from the incore list, for which there is no ordering check.
*/
if (irec->br_startoff < info->lastoff)
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
/* There should never be a "hole" extent in either extent list. */
if (irec->br_startblock == HOLESTARTBLOCK)
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
/*
* Check for delalloc extents. We never iterate the ones in the
* in-core extent scan, and we should never see these in the bmbt.
*/
if (isnullstartblock(irec->br_startblock))
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
/* Make sure the extent points to a valid place. */
if (irec->br_startblock + irec->br_blockcount <= irec->br_startblock)
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
if (info->is_rt &&
(!xfs_verify_rtbno(mp, irec->br_startblock) ||
!xfs_verify_rtbno(mp, irec->br_startblock +
irec->br_blockcount - 1)))
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
if (!info->is_rt &&
(!xfs_verify_fsbno(mp, irec->br_startblock) ||
!xfs_verify_fsbno(mp, irec->br_startblock +
irec->br_blockcount - 1)))
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
/* We don't allow unwritten extents on attr forks. */
if (irec->br_state == XFS_EXT_UNWRITTEN &&
info->whichfork == XFS_ATTR_FORK)
xfs_scrub_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
if (info->is_rt)
xfs_scrub_bmap_rt_extent_xref(info, ip, cur, irec);
else
xfs_scrub_bmap_extent_xref(info, ip, cur, irec);
info->lastoff = irec->br_startoff + irec->br_blockcount;
return error;
}
/* Scrub a bmbt record. */
STATIC int
xfs_scrub_bmapbt_rec(
struct xfs_scrub_btree *bs,
union xfs_btree_rec *rec)
{
struct xfs_bmbt_irec irec;
struct xfs_scrub_bmap_info *info = bs->private;
struct xfs_inode *ip = bs->cur->bc_private.b.ip;
struct xfs_buf *bp = NULL;
struct xfs_btree_block *block;
uint64_t owner;
int i;
/*
* Check the owners of the btree blocks up to the level below
* the root since the verifiers don't do that.
*/
if (xfs_sb_version_hascrc(&bs->cur->bc_mp->m_sb) &&
bs->cur->bc_ptrs[0] == 1) {
for (i = 0; i < bs->cur->bc_nlevels - 1; i++) {
block = xfs_btree_get_block(bs->cur, i, &bp);
owner = be64_to_cpu(block->bb_u.l.bb_owner);
if (owner != ip->i_ino)
xfs_scrub_fblock_set_corrupt(bs->sc,
info->whichfork, 0);
}
}
/* Set up the in-core record and scrub it. */
xfs_bmbt_disk_get_all(&rec->bmbt, &irec);
return xfs_scrub_bmap_extent(ip, bs->cur, info, &irec);
}
/* Scan the btree records. */
STATIC int
xfs_scrub_bmap_btree(
struct xfs_scrub_context *sc,
int whichfork,
struct xfs_scrub_bmap_info *info)
{
struct xfs_owner_info oinfo;
struct xfs_mount *mp = sc->mp;
struct xfs_inode *ip = sc->ip;
struct xfs_btree_cur *cur;
int error;
cur = xfs_bmbt_init_cursor(mp, sc->tp, ip, whichfork);
xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
error = xfs_scrub_btree(sc, cur, xfs_scrub_bmapbt_rec, &oinfo, info);
xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR :
XFS_BTREE_NOERROR);
return error;
}
/*
* Scrub an inode fork's block mappings.
*
* First we scan every record in every btree block, if applicable.
* Then we unconditionally scan the incore extent cache.
*/
STATIC int
xfs_scrub_bmap(
struct xfs_scrub_context *sc,
int whichfork)
{
struct xfs_bmbt_irec irec;
struct xfs_scrub_bmap_info info = { NULL };
struct xfs_mount *mp = sc->mp;
struct xfs_inode *ip = sc->ip;
struct xfs_ifork *ifp;
xfs_fileoff_t endoff;
struct xfs_iext_cursor icur;
int error = 0;
ifp = XFS_IFORK_PTR(ip, whichfork);
info.is_rt = whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip);
info.whichfork = whichfork;
info.is_shared = whichfork == XFS_DATA_FORK && xfs_is_reflink_inode(ip);
info.sc = sc;
switch (whichfork) {
case XFS_COW_FORK:
/* Non-existent CoW forks are ignorable. */
if (!ifp)
goto out;
/* No CoW forks on non-reflink inodes/filesystems. */
if (!xfs_is_reflink_inode(ip)) {
xfs_scrub_ino_set_corrupt(sc, sc->ip->i_ino, NULL);
goto out;
}
break;
case XFS_ATTR_FORK:
if (!ifp)
goto out;
if (!xfs_sb_version_hasattr(&mp->m_sb) &&
!xfs_sb_version_hasattr2(&mp->m_sb))
xfs_scrub_ino_set_corrupt(sc, sc->ip->i_ino, NULL);
break;
default:
ASSERT(whichfork == XFS_DATA_FORK);
break;
}
/* Check the fork values */
switch (XFS_IFORK_FORMAT(ip, whichfork)) {
case XFS_DINODE_FMT_UUID:
case XFS_DINODE_FMT_DEV:
case XFS_DINODE_FMT_LOCAL:
/* No mappings to check. */
goto out;
case XFS_DINODE_FMT_EXTENTS:
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
xfs_scrub_fblock_set_corrupt(sc, whichfork, 0);
goto out;
}
break;
case XFS_DINODE_FMT_BTREE:
if (whichfork == XFS_COW_FORK) {
xfs_scrub_fblock_set_corrupt(sc, whichfork, 0);
goto out;
}
error = xfs_scrub_bmap_btree(sc, whichfork, &info);
if (error)
goto out;
break;
default:
xfs_scrub_fblock_set_corrupt(sc, whichfork, 0);
goto out;
}
if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
goto out;
/* Now try to scrub the in-memory extent list. */
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(sc->tp, ip, whichfork);
if (!xfs_scrub_fblock_process_error(sc, whichfork, 0, &error))
goto out;
}
/* Find the offset of the last extent in the mapping. */
error = xfs_bmap_last_offset(ip, &endoff, whichfork);
if (!xfs_scrub_fblock_process_error(sc, whichfork, 0, &error))
goto out;
/* Scrub extent records. */
info.lastoff = 0;
ifp = XFS_IFORK_PTR(ip, whichfork);
for_each_xfs_iext(ifp, &icur, &irec) {
if (xfs_scrub_should_terminate(sc, &error))
break;
if (isnullstartblock(irec.br_startblock))
continue;
if (irec.br_startoff >= endoff) {
xfs_scrub_fblock_set_corrupt(sc, whichfork,
irec.br_startoff);
goto out;
}
error = xfs_scrub_bmap_extent(ip, NULL, &info, &irec);
if (error)
goto out;
}
out:
return error;
}
/* Scrub an inode's data fork. */
int
xfs_scrub_bmap_data(
struct xfs_scrub_context *sc)
{
return xfs_scrub_bmap(sc, XFS_DATA_FORK);
}
/* Scrub an inode's attr fork. */
int
xfs_scrub_bmap_attr(
struct xfs_scrub_context *sc)
{
return xfs_scrub_bmap(sc, XFS_ATTR_FORK);
}
/* Scrub an inode's CoW fork. */
int
xfs_scrub_bmap_cow(
struct xfs_scrub_context *sc)
{
if (!xfs_is_reflink_inode(sc->ip))
return -ENOENT;
return xfs_scrub_bmap(sc, XFS_COW_FORK);
}