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-rw-r--r--fs/nilfs2/btree.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index ecdbae19a766..059f37137f9a 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -633,6 +633,44 @@ static int nilfs_btree_do_lookup_last(const struct nilfs_bmap *btree,
return 0;
}
+/**
+ * nilfs_btree_get_next_key - get next valid key from btree path array
+ * @btree: bmap struct of btree
+ * @path: array of nilfs_btree_path struct
+ * @minlevel: start level
+ * @nextkey: place to store the next valid key
+ *
+ * Return Value: If a next key was found, 0 is returned. Otherwise,
+ * -ENOENT is returned.
+ */
+static int nilfs_btree_get_next_key(const struct nilfs_bmap *btree,
+ const struct nilfs_btree_path *path,
+ int minlevel, __u64 *nextkey)
+{
+ struct nilfs_btree_node *node;
+ int maxlevel = nilfs_btree_height(btree) - 1;
+ int index, next_adj, level;
+
+ /* Next index is already set to bp_index for leaf nodes. */
+ next_adj = 0;
+ for (level = minlevel; level <= maxlevel; level++) {
+ if (level == maxlevel)
+ node = nilfs_btree_get_root(btree);
+ else
+ node = nilfs_btree_get_nonroot_node(path, level);
+
+ index = path[level].bp_index + next_adj;
+ if (index < nilfs_btree_node_get_nchildren(node)) {
+ /* Next key is in this node */
+ *nextkey = nilfs_btree_node_get_key(node, index);
+ return 0;
+ }
+ /* For non-leaf nodes, next index is stored at bp_index + 1. */
+ next_adj = 1;
+ }
+ return -ENOENT;
+}
+
static int nilfs_btree_lookup(const struct nilfs_bmap *btree,
__u64 key, int level, __u64 *ptrp)
{
@@ -1563,6 +1601,27 @@ out:
return ret;
}
+static int nilfs_btree_seek_key(const struct nilfs_bmap *btree, __u64 start,
+ __u64 *keyp)
+{
+ struct nilfs_btree_path *path;
+ const int minlevel = NILFS_BTREE_LEVEL_NODE_MIN;
+ int ret;
+
+ path = nilfs_btree_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = nilfs_btree_do_lookup(btree, path, start, NULL, minlevel, 0);
+ if (!ret)
+ *keyp = start;
+ else if (ret == -ENOENT)
+ ret = nilfs_btree_get_next_key(btree, path, minlevel, keyp);
+
+ nilfs_btree_free_path(path);
+ return ret;
+}
+
static int nilfs_btree_last_key(const struct nilfs_bmap *btree, __u64 *keyp)
{
struct nilfs_btree_path *path;
@@ -2298,7 +2357,9 @@ static const struct nilfs_bmap_operations nilfs_btree_ops = {
.bop_assign = nilfs_btree_assign,
.bop_mark = nilfs_btree_mark,
+ .bop_seek_key = nilfs_btree_seek_key,
.bop_last_key = nilfs_btree_last_key,
+
.bop_check_insert = NULL,
.bop_check_delete = nilfs_btree_check_delete,
.bop_gather_data = nilfs_btree_gather_data,
@@ -2318,7 +2379,9 @@ static const struct nilfs_bmap_operations nilfs_btree_ops_gc = {
.bop_assign = nilfs_btree_assign_gc,
.bop_mark = NULL,
+ .bop_seek_key = NULL,
.bop_last_key = NULL,
+
.bop_check_insert = NULL,
.bop_check_delete = NULL,
.bop_gather_data = NULL,