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xfs: teach rmapbt to support interval queries 

Now that the generic btree code supports querying all records within a
range of keys, use that functionality to allow us to ask for all the
extents mapped to a range of physical blocks.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
hifive-unleashed-5.1
Darrick J. Wong 2016-08-03 11:42:39 +10:00 committed by Dave Chinner
parent cfed56ae5f
commit c543838a1e
2 changed files with 52 additions and 0 deletions
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43
fs/xfs/libxfs/xfs_rmap.c
View File

@ -183,3 +183,46 @@ out_error:
trace_xfs_rmap_map_error(mp, agno, error, _RET_IP_);
return error;
}
struct xfs_rmap_query_range_info {
xfs_rmap_query_range_fn fn;
void *priv;
};
/* Format btree record and pass to our callback. */
STATIC int
xfs_rmap_query_range_helper(
struct xfs_btree_cur *cur,
union xfs_btree_rec *rec,
void *priv)
{
struct xfs_rmap_query_range_info *query = priv;
struct xfs_rmap_irec irec;
int error;
error = xfs_rmap_btrec_to_irec(rec, &irec);
if (error)
return error;
return query->fn(cur, &irec, query->priv);
}
/* Find all rmaps between two keys. */
int
xfs_rmap_query_range(
struct xfs_btree_cur *cur,
struct xfs_rmap_irec *low_rec,
struct xfs_rmap_irec *high_rec,
xfs_rmap_query_range_fn fn,
void *priv)
{
union xfs_btree_irec low_brec;
union xfs_btree_irec high_brec;
struct xfs_rmap_query_range_info query;
low_brec.r = *low_rec;
high_brec.r = *high_rec;
query.priv = priv;
query.fn = fn;
return xfs_btree_query_range(cur, &low_brec, &high_brec,
xfs_rmap_query_range_helper, &query);
}

9
fs/xfs/libxfs/xfs_rmap.h
View File

@ -151,4 +151,13 @@ int xfs_rmap_lookup_eq(struct xfs_btree_cur *cur, xfs_agblock_t bno,
int xfs_rmap_get_rec(struct xfs_btree_cur *cur, struct xfs_rmap_irec *irec,
int *stat);
typedef int (*xfs_rmap_query_range_fn)(
struct xfs_btree_cur *cur,
struct xfs_rmap_irec *rec,
void *priv);
int xfs_rmap_query_range(struct xfs_btree_cur *cur,
struct xfs_rmap_irec *low_rec, struct xfs_rmap_irec *high_rec,
xfs_rmap_query_range_fn fn, void *priv);
#endif /* __XFS_RMAP_H__ */