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233 lines
7.3 KiB
233 lines
7.3 KiB
// 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 <[email protected]> |
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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_trans_resv.h" |
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#include "xfs_mount.h" |
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#include "xfs_ag.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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XFS_SCRUB_OFLAG_XCORRUPT)); |
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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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