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