diff options
Diffstat (limited to 'fs/xfs/scrub/rtbitmap.c')
| -rw-r--r-- | fs/xfs/scrub/rtbitmap.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/fs/xfs/scrub/rtbitmap.c b/fs/xfs/scrub/rtbitmap.c new file mode 100644 index 000000000..0a3bde64c --- /dev/null +++ b/fs/xfs/scrub/rtbitmap.c @@ -0,0 +1,193 @@ +// 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_log_format.h" +#include "xfs_trans.h" +#include "xfs_rtalloc.h" +#include "xfs_inode.h" +#include "xfs_bmap.h" +#include "scrub/scrub.h" +#include "scrub/common.h" + +/* Set us up with the realtime metadata locked. */ +int +xchk_setup_rt( + struct xfs_scrub *sc) +{ + int error; + + error = xchk_setup_fs(sc); + if (error) + return error; + + sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP; + sc->ip = sc->mp->m_rbmip; + xfs_ilock(sc->ip, sc->ilock_flags); + + 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_rtblock_t blockcount; + + startblock = rec->ar_startext * mp->m_sb.sb_rextsize; + blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize; + + if (!xfs_verify_rtext(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_mount *mp = sc->mp; + struct xfs_bmbt_irec map; + xfs_rtblock_t off; + int nmap; + int error = 0; + + for (off = 0; off < mp->m_sb.sb_rbmblocks;) { + if (xchk_should_terminate(sc, &error) || + (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) + break; + + /* Make sure we have a written extent. */ + nmap = 1; + error = xfs_bmapi_read(mp->m_rbmip, off, + mp->m_sb.sb_rbmblocks - 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) +{ + int error; + + /* Is the size of the rtbitmap correct? */ + if (sc->mp->m_rbmip->i_disk_size != + XFS_FSB_TO_B(sc->mp, sc->mp->m_sb.sb_rbmblocks)) { + xchk_ino_set_corrupt(sc, 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(sc->mp, sc->tp, xchk_rtbitmap_rec, sc); + if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error)) + goto out; + +out: + return error; +} + +/* Scrub the realtime summary. */ +int +xchk_rtsummary( + struct xfs_scrub *sc) +{ + struct xfs_inode *rsumip = sc->mp->m_rsumip; + struct xfs_inode *old_ip = sc->ip; + uint old_ilock_flags = sc->ilock_flags; + int error = 0; + + /* + * We ILOCK'd the rt bitmap ip in the setup routine, now lock the + * rt summary ip in compliance with the rt inode locking rules. + * + * Since we switch sc->ip to rsumip we have to save the old ilock + * flags so that we don't mix up the inode state that @sc tracks. + */ + sc->ip = rsumip; + sc->ilock_flags = XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM; + xfs_ilock(sc->ip, sc->ilock_flags); + + /* Invoke the fork scrubber. */ + error = xchk_metadata_inode_forks(sc); + if (error || (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)) + goto out; + + /* XXX: implement this some day */ + xchk_set_incomplete(sc); +out: + /* Switch back to the rtbitmap inode and lock flags. */ + xfs_iunlock(sc->ip, sc->ilock_flags); + sc->ilock_flags = old_ilock_flags; + sc->ip = old_ip; + return error; +} + + +/* 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 fsbno, + xfs_extlen_t len) +{ + xfs_rtblock_t startext; + xfs_rtblock_t endext; + xfs_rtblock_t extcount; + bool is_free; + int error; + + if (xchk_skip_xref(sc->sm)) + return; + + startext = fsbno; + endext = fsbno + len - 1; + do_div(startext, sc->mp->m_sb.sb_rextsize); + do_div(endext, sc->mp->m_sb.sb_rextsize); + extcount = endext - startext + 1; + xfs_ilock(sc->mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP); + error = xfs_rtalloc_extent_is_free(sc->mp, sc->tp, startext, extcount, + &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); +} |