From 2cccc8cee7230141991f142c9ac5273de6514dd1 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Tue, 25 Oct 2016 11:26:53 +1100 Subject: [PATCH] xfs: count the blocks in a btree Source kernel commit: c611cc0360cd924448c23ccd70ce8be703fcb4a6 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. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Signed-off-by: Dave Chinner --- libxfs/xfs_btree.c | 23 +++++++++++++++++++++++ libxfs/xfs_btree.h | 2 ++ 2 files changed, 25 insertions(+) diff --git a/libxfs/xfs_btree.c b/libxfs/xfs_btree.c index 732652b43..855d6a625 100644 --- a/libxfs/xfs_btree.c +++ b/libxfs/xfs_btree.c @@ -4821,3 +4821,26 @@ 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/libxfs/xfs_btree.h b/libxfs/xfs_btree.h index 607463a0c..be4a0c13b 100644 --- a/libxfs/xfs_btree.h +++ b/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__ */ -- 2.47.2