// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_log_format.h"
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#include "xfs_trans.h"
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#include "xfs_rtalloc.h"
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#include "xfs_inode.h"
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#include "xfs_bmap.h"
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#include "scrub/scrub.h"
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#include "scrub/common.h"
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/* Set us up with the realtime metadata locked. */
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int
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xchk_setup_rt(
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struct xfs_scrub *sc,
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struct xfs_inode *ip)
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{
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int error;
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error = xchk_setup_fs(sc, ip);
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if (error)
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return error;
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sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP;
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sc->ip = sc->mp->m_rbmip;
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xfs_ilock(sc->ip, sc->ilock_flags);
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return 0;
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}
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/* Realtime bitmap. */
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/* Scrub a free extent record from the realtime bitmap. */
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STATIC int
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xchk_rtbitmap_rec(
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struct xfs_trans *tp,
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struct xfs_rtalloc_rec *rec,
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void *priv)
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{
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struct xfs_scrub *sc = priv;
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xfs_rtblock_t startblock;
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xfs_rtblock_t blockcount;
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startblock = rec->ar_startext * tp->t_mountp->m_sb.sb_rextsize;
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blockcount = rec->ar_extcount * tp->t_mountp->m_sb.sb_rextsize;
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if (startblock + blockcount <= startblock ||
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!xfs_verify_rtbno(sc->mp, startblock) ||
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!xfs_verify_rtbno(sc->mp, startblock + blockcount - 1))
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xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
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return 0;
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}
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/* Make sure the entire rtbitmap file is mapped with written extents. */
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STATIC int
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xchk_rtbitmap_check_extents(
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struct xfs_scrub *sc)
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{
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struct xfs_mount *mp = sc->mp;
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struct xfs_bmbt_irec map;
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xfs_rtblock_t off;
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int nmap;
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int error = 0;
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for (off = 0; off < mp->m_sb.sb_rbmblocks;) {
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if (xchk_should_terminate(sc, &error) ||
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(sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
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break;
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/* Make sure we have a written extent. */
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nmap = 1;
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error = xfs_bmapi_read(mp->m_rbmip, off,
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mp->m_sb.sb_rbmblocks - off, &map, &nmap,
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XFS_DATA_FORK);
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if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, off, &error))
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break;
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if (nmap != 1 || !xfs_bmap_is_written_extent(&map)) {
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xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, off);
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break;
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}
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off += map.br_blockcount;
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}
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return error;
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}
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/* Scrub the realtime bitmap. */
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int
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xchk_rtbitmap(
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struct xfs_scrub *sc)
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{
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int error;
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/* Is the size of the rtbitmap correct? */
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if (sc->mp->m_rbmip->i_d.di_size !=
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XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) {
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xchk_ino_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
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return 0;
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}
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/* Invoke the fork scrubber. */
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error = xchk_metadata_inode_forks(sc);
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if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
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return error;
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error = xchk_rtbitmap_check_extents(sc);
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if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
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return error;
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error = xfs_rtalloc_query_all(sc->tp, xchk_rtbitmap_rec, sc);
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if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
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goto out;
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out:
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return error;
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}
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/* Scrub the realtime summary. */
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int
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xchk_rtsummary(
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struct xfs_scrub *sc)
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{
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struct xfs_inode *rsumip = sc->mp->m_rsumip;
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struct xfs_inode *old_ip = sc->ip;
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uint old_ilock_flags = sc->ilock_flags;
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int error = 0;
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/*
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* We ILOCK'd the rt bitmap ip in the setup routine, now lock the
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* rt summary ip in compliance with the rt inode locking rules.
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*
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* Since we switch sc->ip to rsumip we have to save the old ilock
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* flags so that we don't mix up the inode state that @sc tracks.
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*/
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sc->ip = rsumip;
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sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM;
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xfs_ilock(sc->ip, sc->ilock_flags);
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/* Invoke the fork scrubber. */
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error = xchk_metadata_inode_forks(sc);
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if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
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goto out;
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/* XXX: implement this some day */
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xchk_set_incomplete(sc);
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out:
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/* Switch back to the rtbitmap inode and lock flags. */
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xfs_iunlock(sc->ip, sc->ilock_flags);
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sc->ilock_flags = old_ilock_flags;
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sc->ip = old_ip;
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return error;
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}
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/* xref check that the extent is not free in the rtbitmap */
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void
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xchk_xref_is_used_rt_space(
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struct xfs_scrub *sc,
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xfs_rtblock_t fsbno,
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xfs_extlen_t len)
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{
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xfs_rtblock_t startext;
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xfs_rtblock_t endext;
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xfs_rtblock_t extcount;
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bool is_free;
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int error;
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if (xchk_skip_xref(sc->sm))
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return;
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startext = fsbno;
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endext = fsbno + len - 1;
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do_div(startext, sc->mp->m_sb.sb_rextsize);
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do_div(endext, sc->mp->m_sb.sb_rextsize);
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extcount = endext - startext + 1;
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xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
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error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount,
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&is_free);
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if (!xchk_should_check_xref(sc, &error, NULL))
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goto out_unlock;
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if (is_free)
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xchk_ino_xref_set_corrupt(sc, sc->mp->m_rbmip->i_ino);
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out_unlock:
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xfs_iunlock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
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}
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