xfs: create a ranged query function for refcount btrees

Implement ranged queries for refcount records.  The next patch will use
this to scan refcount data.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
index 3a9f22d94444bbcf902e7f38e7c690637cbbb422..6709a7f8bad5a4f67bf674d64abb6d4118cec485 100644 (file)
--- a/fs/xfs/libxfs/xfs_refcount.c
+++ b/fs/xfs/libxfs/xfs_refcount.c
@@ -2031,6 +2031,47 @@ xfs_refcount_has_records(
        return xfs_btree_has_records(cur, &low, &high, NULL, outcome);
 }
 
+struct xfs_refcount_query_range_info {
+       xfs_refcount_query_range_fn     fn;
+       void                            *priv;
+};
+
+/* Format btree record and pass to our callback. */
+STATIC int
+xfs_refcount_query_range_helper(
+       struct xfs_btree_cur            *cur,
+       const union xfs_btree_rec       *rec,
+       void                            *priv)
+{
+       struct xfs_refcount_query_range_info    *query = priv;
+       struct xfs_refcount_irec        irec;
+       xfs_failaddr_t                  fa;
+
+       xfs_refcount_btrec_to_irec(rec, &irec);
+       fa = xfs_refcount_check_irec(cur->bc_ag.pag, &irec);
+       if (fa)
+               return xfs_refcount_complain_bad_rec(cur, fa, &irec);
+
+       return query->fn(cur, &irec, query->priv);
+}
+
+/* Find all refcount records between two keys. */
+int
+xfs_refcount_query_range(
+       struct xfs_btree_cur            *cur,
+       const struct xfs_refcount_irec  *low_rec,
+       const struct xfs_refcount_irec  *high_rec,
+       xfs_refcount_query_range_fn     fn,
+       void                            *priv)
+{
+       union xfs_btree_irec            low_brec = { .rc = *low_rec };
+       union xfs_btree_irec            high_brec = { .rc = *high_rec };
+       struct xfs_refcount_query_range_info query = { .priv = priv, .fn = fn };
+
+       return xfs_btree_query_range(cur, &low_brec, &high_brec,
+                       xfs_refcount_query_range_helper, &query);
+}
+
 int __init
 xfs_refcount_intent_init_cache(void)
 {

diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h
index 5c207f1c619c71ab3101c58823ab756cfb5bf564..9b56768a590c01f5adf132abf3a77f9bd67f90d8 100644 (file)
--- a/fs/xfs/libxfs/xfs_refcount.h
+++ b/fs/xfs/libxfs/xfs_refcount.h
@@ -127,4 +127,14 @@ extern struct kmem_cache   *xfs_refcount_intent_cache;
 int __init xfs_refcount_intent_init_cache(void);
 void xfs_refcount_intent_destroy_cache(void);
 
+typedef int (*xfs_refcount_query_range_fn)(
+       struct xfs_btree_cur            *cur,
+       const struct xfs_refcount_irec  *rec,
+       void                            *priv);
+
+int xfs_refcount_query_range(struct xfs_btree_cur *cur,
+               const struct xfs_refcount_irec *low_rec,
+               const struct xfs_refcount_irec *high_rec,
+               xfs_refcount_query_range_fn fn, void *priv);
+
 #endif /* __XFS_REFCOUNT_H__ */