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xfs: create helpers to scan an allocation group

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Add some helpers to enable us to lock an AG's headers, create btree
cursors for all btrees in that allocation group, and clean up
afterwards.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong
2017-10-17 21:37:38 -07:00
parent 37f3fa7f16
commit b6c1beb967
4 changed files with 214 additions and 0 deletions
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21
fs/xfs/scrub/scrub.h
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@@ -34,6 +34,24 @@ struct xfs_scrub_meta_ops {
bool (*has)(struct xfs_sb *);
};
/* Buffer pointers and btree cursors for an entire AG. */
struct xfs_scrub_ag {
xfs_agnumber_t agno;
/* AG btree roots */
struct xfs_buf *agf_bp;
struct xfs_buf *agfl_bp;
struct xfs_buf *agi_bp;
/* AG btrees */
struct xfs_btree_cur *bno_cur;
struct xfs_btree_cur *cnt_cur;
struct xfs_btree_cur *ino_cur;
struct xfs_btree_cur *fino_cur;
struct xfs_btree_cur *rmap_cur;
struct xfs_btree_cur *refc_cur;
};
struct xfs_scrub_context {
/* General scrub state. */
struct xfs_mount *mp;
@@ -42,6 +60,9 @@ struct xfs_scrub_context {
struct xfs_trans *tp;
struct xfs_inode *ip;
bool try_harder;
/* State tracking for single-AG operations. */
struct xfs_scrub_ag sa;
};
/* Metadata scrubbers */