231 lines
7.2 KiB
C
231 lines
7.2 KiB
C
// 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;
|
|
}
|