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xfs: add online scrub for superblock counters

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Teach online scrub how to check the filesystem summary counters.  We use
the incore delalloc block counter along with the incore AG headers to
compute expected values for fdblocks, icount, and ifree, and then check
that the percpu counter is within a certain threshold of the expected
value.  This is done to avoid having to freeze or otherwise lock the
filesystem, which means that we're only checking that the counters are
fairly close, not that they're exactly correct.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong
2019-04-25 18:26:24 -07:00
parent 9407928575
commit 75efa57d0b
11 changed files with 461 additions and 3 deletions
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9
fs/xfs/scrub/scrub.h
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@@ -127,6 +127,7 @@ xchk_quota(struct xfs_scrub *sc)
return -ENOENT;
}
#endif
int xchk_fscounters(struct xfs_scrub *sc);
/* cross-referencing helpers */
void xchk_xref_is_used_space(struct xfs_scrub *sc, xfs_agblock_t agbno,
@@ -152,4 +153,12 @@ void xchk_xref_is_used_rt_space(struct xfs_scrub *sc, xfs_rtblock_t rtbno,
# define xchk_xref_is_used_rt_space(sc, rtbno, len) do { } while (0)
#endif
struct xchk_fscounters {
uint64_t icount;
uint64_t ifree;
uint64_t fdblocks;
unsigned long long icount_min;
unsigned long long icount_max;
};
#endif /* __XFS_SCRUB_SCRUB_H__ */