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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>
165 lines
4.6 KiB
C
165 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#ifndef __XFS_SCRUB_SCRUB_H__
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#define __XFS_SCRUB_SCRUB_H__
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struct xfs_scrub;
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/* Type info and names for the scrub types. */
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enum xchk_type {
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ST_NONE = 1, /* disabled */
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ST_PERAG, /* per-AG metadata */
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ST_FS, /* per-FS metadata */
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ST_INODE, /* per-inode metadata */
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};
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struct xchk_meta_ops {
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/* Acquire whatever resources are needed for the operation. */
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int (*setup)(struct xfs_scrub *,
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struct xfs_inode *);
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/* Examine metadata for errors. */
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int (*scrub)(struct xfs_scrub *);
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/* Repair or optimize the metadata. */
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int (*repair)(struct xfs_scrub *);
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/* Decide if we even have this piece of metadata. */
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bool (*has)(struct xfs_sb *);
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/* type describing required/allowed inputs */
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enum xchk_type type;
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};
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/* Buffer pointers and btree cursors for an entire AG. */
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struct xchk_ag {
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xfs_agnumber_t agno;
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struct xfs_perag *pag;
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/* AG btree roots */
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struct xfs_buf *agf_bp;
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struct xfs_buf *agfl_bp;
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struct xfs_buf *agi_bp;
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/* AG btrees */
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struct xfs_btree_cur *bno_cur;
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struct xfs_btree_cur *cnt_cur;
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struct xfs_btree_cur *ino_cur;
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struct xfs_btree_cur *fino_cur;
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struct xfs_btree_cur *rmap_cur;
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struct xfs_btree_cur *refc_cur;
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};
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struct xfs_scrub {
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/* General scrub state. */
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struct xfs_mount *mp;
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struct xfs_scrub_metadata *sm;
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const struct xchk_meta_ops *ops;
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struct xfs_trans *tp;
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struct xfs_inode *ip;
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void *buf;
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uint ilock_flags;
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/* See the XCHK/XREP state flags below. */
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unsigned int flags;
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/*
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* The XFS_SICK_* flags that correspond to the metadata being scrubbed
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* or repaired. We will use this mask to update the in-core fs health
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* status with whatever we find.
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*/
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unsigned int sick_mask;
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/* State tracking for single-AG operations. */
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struct xchk_ag sa;
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};
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/* XCHK state flags grow up from zero, XREP state flags grown down from 2^31 */
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#define XCHK_TRY_HARDER (1 << 0) /* can't get resources, try again */
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#define XCHK_HAS_QUOTAOFFLOCK (1 << 1) /* we hold the quotaoff lock */
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#define XCHK_REAPING_DISABLED (1 << 2) /* background block reaping paused */
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#define XREP_ALREADY_FIXED (1 << 31) /* checking our repair work */
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/* Metadata scrubbers */
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int xchk_tester(struct xfs_scrub *sc);
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int xchk_superblock(struct xfs_scrub *sc);
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int xchk_agf(struct xfs_scrub *sc);
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int xchk_agfl(struct xfs_scrub *sc);
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int xchk_agi(struct xfs_scrub *sc);
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int xchk_bnobt(struct xfs_scrub *sc);
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int xchk_cntbt(struct xfs_scrub *sc);
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int xchk_inobt(struct xfs_scrub *sc);
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int xchk_finobt(struct xfs_scrub *sc);
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int xchk_rmapbt(struct xfs_scrub *sc);
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int xchk_refcountbt(struct xfs_scrub *sc);
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int xchk_inode(struct xfs_scrub *sc);
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int xchk_bmap_data(struct xfs_scrub *sc);
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int xchk_bmap_attr(struct xfs_scrub *sc);
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int xchk_bmap_cow(struct xfs_scrub *sc);
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int xchk_directory(struct xfs_scrub *sc);
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int xchk_xattr(struct xfs_scrub *sc);
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int xchk_symlink(struct xfs_scrub *sc);
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int xchk_parent(struct xfs_scrub *sc);
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#ifdef CONFIG_XFS_RT
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int xchk_rtbitmap(struct xfs_scrub *sc);
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int xchk_rtsummary(struct xfs_scrub *sc);
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#else
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static inline int
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xchk_rtbitmap(struct xfs_scrub *sc)
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{
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return -ENOENT;
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}
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static inline int
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xchk_rtsummary(struct xfs_scrub *sc)
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{
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return -ENOENT;
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}
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#endif
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#ifdef CONFIG_XFS_QUOTA
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int xchk_quota(struct xfs_scrub *sc);
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#else
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static inline int
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xchk_quota(struct xfs_scrub *sc)
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{
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return -ENOENT;
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}
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#endif
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int xchk_fscounters(struct xfs_scrub *sc);
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/* cross-referencing helpers */
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void xchk_xref_is_used_space(struct xfs_scrub *sc, xfs_agblock_t agbno,
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xfs_extlen_t len);
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void xchk_xref_is_not_inode_chunk(struct xfs_scrub *sc, xfs_agblock_t agbno,
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xfs_extlen_t len);
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void xchk_xref_is_inode_chunk(struct xfs_scrub *sc, xfs_agblock_t agbno,
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xfs_extlen_t len);
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void xchk_xref_is_owned_by(struct xfs_scrub *sc, xfs_agblock_t agbno,
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xfs_extlen_t len, const struct xfs_owner_info *oinfo);
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void xchk_xref_is_not_owned_by(struct xfs_scrub *sc, xfs_agblock_t agbno,
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xfs_extlen_t len, const struct xfs_owner_info *oinfo);
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void xchk_xref_has_no_owner(struct xfs_scrub *sc, xfs_agblock_t agbno,
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xfs_extlen_t len);
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void xchk_xref_is_cow_staging(struct xfs_scrub *sc, xfs_agblock_t bno,
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xfs_extlen_t len);
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void xchk_xref_is_not_shared(struct xfs_scrub *sc, xfs_agblock_t bno,
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xfs_extlen_t len);
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#ifdef CONFIG_XFS_RT
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void xchk_xref_is_used_rt_space(struct xfs_scrub *sc, xfs_rtblock_t rtbno,
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xfs_extlen_t len);
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#else
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# define xchk_xref_is_used_rt_space(sc, rtbno, len) do { } while (0)
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#endif
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struct xchk_fscounters {
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uint64_t icount;
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uint64_t ifree;
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uint64_t fdblocks;
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unsigned long long icount_min;
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unsigned long long icount_max;
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};
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#endif /* __XFS_SCRUB_SCRUB_H__ */
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