Provide a helper method to count the number of blocks in a short form
btree. The refcount and rmap btrees need to know the number of blocks
already in use to set up their per-AG block reservations during mount.
v2: Use btree_visit_blocks instead of open-coding our own traversal
routine.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_btree.c | 23 +++++++++++++++++++++++
fs/xfs/libxfs/xfs_btree.h | 2 ++
2 files changed, 25 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
index 1bc483b..3dfb541 100644
--- a/fs/xfs/libxfs/xfs_btree.c
+++ b/fs/xfs/libxfs/xfs_btree.c
@@ -4825,3 +4825,26 @@ xfs_btree_calc_size(
}
return rval;
}
+
+int
+xfs_btree_count_blocks_helper(
+ struct xfs_btree_cur *cur,
+ int level,
+ void *data)
+{
+ xfs_extlen_t *blocks = data;
+ (*blocks)++;
+
+ return 0;
+}
+
+/* Count the blocks in a btree and return the result in *blocks. */
+int
+xfs_btree_count_blocks(
+ struct xfs_btree_cur *cur,
+ xfs_extlen_t *blocks)
+{
+ *blocks = 0;
+ return xfs_btree_visit_blocks(cur, xfs_btree_count_blocks_helper,
+ blocks);
+}
diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index 607463a..be4a0c1 100644
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -519,4 +519,6 @@ typedef int (*xfs_btree_visit_blocks_fn)(struct xfs_btree_cur *cur, int level,
int xfs_btree_visit_blocks(struct xfs_btree_cur *cur,
xfs_btree_visit_blocks_fn fn, void *data);
+int xfs_btree_count_blocks(struct xfs_btree_cur *cur, xfs_extlen_t *blocks);
+
#endif /* __XFS_BTREE_H__ */
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