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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2017-2023 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#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_log_format.h"
#include "xfs_trans.h"
#include "xfs_rtbitmap.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_bit.h"
#include "xfs_sb.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/repair.h"
#include "scrub/rtbitmap.h"
/* Set us up with the realtime metadata locked. */
int
xchk_setup_rtbitmap(
struct xfs_scrub *sc)
{
struct xfs_mount *mp = sc->mp;
struct xchk_rtbitmap *rtb;
int error;
rtb = kzalloc(sizeof(struct xchk_rtbitmap), XCHK_GFP_FLAGS);
if (!rtb)
return -ENOMEM;
sc->buf = rtb;
if (xchk_could_repair(sc)) {
error = xrep_setup_rtbitmap(sc, rtb);
if (error)
return error;
}
error = xchk_trans_alloc(sc, rtb->resblks);
if (error)
return error;
error = xchk_install_live_inode(sc, sc->mp->m_rbmip);
if (error)
return error;
error = xchk_ino_dqattach(sc);
if (error)
return error;
xchk_ilock(sc, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP);
/*
* Now that we've locked the rtbitmap, we can't race with growfsrt
* trying to expand the bitmap or change the size of the rt volume.
* Hence it is safe to compute and check the geometry values.
*/
if (mp->m_sb.sb_rblocks) {
rtb->rextents = xfs_rtb_to_rtx(mp, mp->m_sb.sb_rblocks);
rtb->rextslog = xfs_compute_rextslog(rtb->rextents);
rtb->rbmblocks = xfs_rtbitmap_blockcount(mp, rtb->rextents);
}
return 0;
}
/* Realtime bitmap. */
/* Scrub a free extent record from the realtime bitmap. */
STATIC int
xchk_rtbitmap_rec(
struct xfs_mount *mp,
struct xfs_trans *tp,
const struct xfs_rtalloc_rec *rec,
void *priv)
{
struct xfs_scrub *sc = priv;
xfs_rtblock_t startblock;
xfs_filblks_t blockcount;
startblock = xfs_rtx_to_rtb(mp, rec->ar_startext);
blockcount = xfs_rtx_to_rtb(mp, rec->ar_extcount);
if (!xfs_verify_rtbext(mp, startblock, blockcount))
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
return 0;
}
/* Make sure the entire rtbitmap file is mapped with written extents. */
STATIC int
xchk_rtbitmap_check_extents(
struct xfs_scrub *sc)
{
struct xfs_bmbt_irec map;
struct xfs_iext_cursor icur;
struct xfs_mount *mp = sc->mp;
struct xfs_inode *ip = sc->ip;
xfs_fileoff_t off = 0;
xfs_fileoff_t endoff;
int error = 0;
/* Mappings may not cross or lie beyond EOF. */
endoff = XFS_B_TO_FSB(mp, ip->i_disk_size);
if (xfs_iext_lookup_extent(ip, &ip->i_df, endoff, &icur, &map)) {
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, endoff);
return 0;
}
while (off < endoff) {
int nmap = 1;
if (xchk_should_terminate(sc, &error) ||
(sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
break;
/* Make sure we have a written extent. */
error = xfs_bmapi_read(ip, off, endoff - off, &map, &nmap,
XFS_DATA_FORK);
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error))
break;
if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) {
xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off);
break;
}
off += map.br_blockcount;
}
return error;
}
/* Scrub the realtime bitmap. */
int
xchk_rtbitmap(
struct xfs_scrub *sc)
{
struct xfs_mount *mp = sc->mp;
struct xchk_rtbitmap *rtb = sc->buf;
int error;
/* Is sb_rextents correct? */
if (mp->m_sb.sb_rextents != rtb->rextents) {
xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
return 0;
}
/* Is sb_rextslog correct? */
if (mp->m_sb.sb_rextslog != rtb->rextslog) {
xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
return 0;
}
/*
* Is sb_rbmblocks large enough to handle the current rt volume? In no
* case can we exceed 4bn bitmap blocks since the super field is a u32.
*/
if (rtb->rbmblocks > U32_MAX) {
xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
return 0;
}
if (mp->m_sb.sb_rbmblocks != rtb->rbmblocks) {
xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
return 0;
}
/* The bitmap file length must be aligned to an fsblock. */
if (mp->m_rbmip->i_disk_size & mp->m_blockmask) {
xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
return 0;
}
/*
* Is the bitmap file itself large enough to handle the rt volume?
* growfsrt expands the bitmap file before updating sb_rextents, so the
* file can be larger than sb_rbmblocks.
*/
if (mp->m_rbmip->i_disk_size < XFS_FSB_TO_B(mp, rtb->rbmblocks)) {
xchk_ino_set_corrupt(sc, mp->m_rbmip->i_ino);
return 0;
}
/* Invoke the fork scrubber. */
error = xchk_metadata_inode_forks(sc);
if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
return error;
error = xchk_rtbitmap_check_extents(sc);
if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
return error;
error = xfs_rtalloc_query_all(mp, sc->tp, xchk_rtbitmap_rec, sc);
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
return error;
return 0;
}
/* xref check that the extent is not free in the rtbitmap */
void
xchk_xref_is_used_rt_space(
struct xfs_scrub *sc,
xfs_rtblock_t rtbno,
xfs_extlen_t len)
{
xfs_rtxnum_t startext;
xfs_rtxnum_t endext;
bool is_free;
int error;
if (xchk_skip_xref(sc->sm))
return;
startext = xfs_rtb_to_rtx(sc->mp, rtbno);
endext = xfs_rtb_to_rtx(sc->mp, rtbno + len - 1);
xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext,
endext - startext + 1, &is_free);
if (!xchk_should_check_xref(sc, &error, NULL))
goto out_unlock;
if (is_free)
xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
out_unlock:
xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
}
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