// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 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_btree.h"
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#include "xfs_sb.h"
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#include "xfs_health.h"
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#include "scrub/scrub.h"
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#include "scrub/health.h"
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/*
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* Scrub and In-Core Filesystem Health Assessments
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* ===============================================
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*
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* Online scrub and repair have the time and the ability to perform stronger
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* checks than we can do from the metadata verifiers, because they can
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* cross-reference records between data structures. Therefore, scrub is in a
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* good position to update the online filesystem health assessments to reflect
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* the good/bad state of the data structure.
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*
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* We therefore extend scrub in the following ways to achieve this:
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*
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* 1. Create a "sick_mask" field in the scrub context. When we're setting up a
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* scrub call, set this to the default XFS_SICK_* flag(s) for the selected
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* scrub type (call it A). Scrub and repair functions can override the default
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* sick_mask value if they choose.
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*
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* 2. If the scrubber returns a runtime error code, we exit making no changes
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* to the incore sick state.
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*
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* 3. If the scrubber finds that A is clean, use sick_mask to clear the incore
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* sick flags before exiting.
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*
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* 4. If the scrubber finds that A is corrupt, use sick_mask to set the incore
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* sick flags. If the user didn't want to repair then we exit, leaving the
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* metadata structure unfixed and the sick flag set.
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*
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* 5. Now we know that A is corrupt and the user wants to repair, so run the
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* repairer. If the repairer returns an error code, we exit with that error
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* code, having made no further changes to the incore sick state.
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*
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* 6. If repair rebuilds A correctly and the subsequent re-scrub of A is clean,
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* use sick_mask to clear the incore sick flags. This should have the effect
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* that A is no longer marked sick.
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*
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* 7. If repair rebuilds A incorrectly, the re-scrub will find it corrupt and
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* use sick_mask to set the incore sick flags. This should have no externally
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* visible effect since we already set them in step (4).
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*
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* There are some complications to this story, however. For certain types of
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* complementary metadata indices (e.g. inobt/finobt), it is easier to rebuild
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* both structures at the same time. The following principles apply to this
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* type of repair strategy:
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*
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* 8. Any repair function that rebuilds multiple structures should update
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* sick_mask_visible to reflect whatever other structures are rebuilt, and
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* verify that all the rebuilt structures can pass a scrub check. The outcomes
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* of 5-7 still apply, but with a sick_mask that covers everything being
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* rebuilt.
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*/
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/* Map our scrub type to a sick mask and a set of health update functions. */
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enum xchk_health_group {
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XHG_FS = 1,
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XHG_RT,
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XHG_AG,
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XHG_INO,
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};
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struct xchk_health_map {
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enum xchk_health_group group;
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unsigned int sick_mask;
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};
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static const struct xchk_health_map type_to_health_flag[XFS_SCRUB_TYPE_NR] = {
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[XFS_SCRUB_TYPE_SB] = { XHG_AG, XFS_SICK_AG_SB },
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[XFS_SCRUB_TYPE_AGF] = { XHG_AG, XFS_SICK_AG_AGF },
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[XFS_SCRUB_TYPE_AGFL] = { XHG_AG, XFS_SICK_AG_AGFL },
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[XFS_SCRUB_TYPE_AGI] = { XHG_AG, XFS_SICK_AG_AGI },
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[XFS_SCRUB_TYPE_BNOBT] = { XHG_AG, XFS_SICK_AG_BNOBT },
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[XFS_SCRUB_TYPE_CNTBT] = { XHG_AG, XFS_SICK_AG_CNTBT },
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[XFS_SCRUB_TYPE_INOBT] = { XHG_AG, XFS_SICK_AG_INOBT },
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[XFS_SCRUB_TYPE_FINOBT] = { XHG_AG, XFS_SICK_AG_FINOBT },
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[XFS_SCRUB_TYPE_RMAPBT] = { XHG_AG, XFS_SICK_AG_RMAPBT },
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[XFS_SCRUB_TYPE_REFCNTBT] = { XHG_AG, XFS_SICK_AG_REFCNTBT },
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[XFS_SCRUB_TYPE_INODE] = { XHG_INO, XFS_SICK_INO_CORE },
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[XFS_SCRUB_TYPE_BMBTD] = { XHG_INO, XFS_SICK_INO_BMBTD },
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[XFS_SCRUB_TYPE_BMBTA] = { XHG_INO, XFS_SICK_INO_BMBTA },
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[XFS_SCRUB_TYPE_BMBTC] = { XHG_INO, XFS_SICK_INO_BMBTC },
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[XFS_SCRUB_TYPE_DIR] = { XHG_INO, XFS_SICK_INO_DIR },
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[XFS_SCRUB_TYPE_XATTR] = { XHG_INO, XFS_SICK_INO_XATTR },
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[XFS_SCRUB_TYPE_SYMLINK] = { XHG_INO, XFS_SICK_INO_SYMLINK },
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[XFS_SCRUB_TYPE_PARENT] = { XHG_INO, XFS_SICK_INO_PARENT },
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[XFS_SCRUB_TYPE_RTBITMAP] = { XHG_RT, XFS_SICK_RT_BITMAP },
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[XFS_SCRUB_TYPE_RTSUM] = { XHG_RT, XFS_SICK_RT_SUMMARY },
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[XFS_SCRUB_TYPE_UQUOTA] = { XHG_FS, XFS_SICK_FS_UQUOTA },
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[XFS_SCRUB_TYPE_GQUOTA] = { XHG_FS, XFS_SICK_FS_GQUOTA },
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[XFS_SCRUB_TYPE_PQUOTA] = { XHG_FS, XFS_SICK_FS_PQUOTA },
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[XFS_SCRUB_TYPE_FSCOUNTERS] = { XHG_FS, XFS_SICK_FS_COUNTERS },
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};
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/* Return the health status mask for this scrub type. */
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unsigned int
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xchk_health_mask_for_scrub_type(
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__u32 scrub_type)
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{
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return type_to_health_flag[scrub_type].sick_mask;
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}
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/*
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* Update filesystem health assessments based on what we found and did.
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*
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* If the scrubber finds errors, we mark sick whatever's mentioned in
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* sick_mask, no matter whether this is a first scan or an
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* evaluation of repair effectiveness.
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*
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* Otherwise, no direct corruption was found, so mark whatever's in
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* sick_mask as healthy.
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*/
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void
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xchk_update_health(
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struct xfs_scrub *sc)
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{
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struct xfs_perag *pag;
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bool bad;
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if (!sc->sick_mask)
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return;
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bad = (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT);
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switch (type_to_health_flag[sc->sm->sm_type].group) {
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case XHG_AG:
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pag = xfs_perag_get(sc->mp, sc->sm->sm_agno);
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if (bad)
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xfs_ag_mark_sick(pag, sc->sick_mask);
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else
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xfs_ag_mark_healthy(pag, sc->sick_mask);
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xfs_perag_put(pag);
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break;
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case XHG_INO:
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if (!sc->ip)
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return;
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if (bad)
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xfs_inode_mark_sick(sc->ip, sc->sick_mask);
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else
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xfs_inode_mark_healthy(sc->ip, sc->sick_mask);
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break;
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case XHG_FS:
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if (bad)
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xfs_fs_mark_sick(sc->mp, sc->sick_mask);
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else
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xfs_fs_mark_healthy(sc->mp, sc->sick_mask);
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break;
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case XHG_RT:
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if (bad)
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xfs_rt_mark_sick(sc->mp, sc->sick_mask);
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else
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xfs_rt_mark_healthy(sc->mp, sc->sick_mask);
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break;
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default:
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ASSERT(0);
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break;
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}
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}
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/* Is the given per-AG btree healthy enough for scanning? */
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bool
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xchk_ag_btree_healthy_enough(
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struct xfs_scrub *sc,
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struct xfs_perag *pag,
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xfs_btnum_t btnum)
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{
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unsigned int mask = 0;
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/*
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* We always want the cursor if it's the same type as whatever we're
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* scrubbing, even if we already know the structure is corrupt.
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*
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* Otherwise, we're only interested in the btree for cross-referencing.
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* If we know the btree is bad then don't bother, just set XFAIL.
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*/
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switch (btnum) {
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case XFS_BTNUM_BNO:
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if (sc->sm->sm_type == XFS_SCRUB_TYPE_BNOBT)
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return true;
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mask = XFS_SICK_AG_BNOBT;
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break;
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case XFS_BTNUM_CNT:
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if (sc->sm->sm_type == XFS_SCRUB_TYPE_CNTBT)
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return true;
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mask = XFS_SICK_AG_CNTBT;
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break;
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case XFS_BTNUM_INO:
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if (sc->sm->sm_type == XFS_SCRUB_TYPE_INOBT)
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return true;
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mask = XFS_SICK_AG_INOBT;
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break;
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case XFS_BTNUM_FINO:
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if (sc->sm->sm_type == XFS_SCRUB_TYPE_FINOBT)
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return true;
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mask = XFS_SICK_AG_FINOBT;
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break;
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case XFS_BTNUM_RMAP:
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if (sc->sm->sm_type == XFS_SCRUB_TYPE_RMAPBT)
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return true;
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mask = XFS_SICK_AG_RMAPBT;
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break;
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case XFS_BTNUM_REFC:
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if (sc->sm->sm_type == XFS_SCRUB_TYPE_REFCNTBT)
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return true;
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mask = XFS_SICK_AG_REFCNTBT;
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break;
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default:
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ASSERT(0);
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return true;
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}
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if (xfs_ag_has_sickness(pag, mask)) {
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sc->sm->sm_flags |= XFS_SCRUB_OFLAG_XFAIL;
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return false;
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}
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return true;
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}
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