Btrfs: finish off inode indexing in dirs, add overflows

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 69 insertions, 5 deletions

diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 62d0c0916a73..b1629a5d73c8 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -4,6 +4,26 @@
 #include "hash.h"
 #include "transaction.h"
 
+int insert_with_overflow(struct btrfs_trans_handle *trans, struct btrfs_root
+			    *root, struct btrfs_path *path, struct btrfs_key
+			    *cpu_key, u32 data_size)
+{
+	int overflow;
+	int ret;
+
+	ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
+	overflow = btrfs_key_overflow(cpu_key);
+
+	while(ret == -EEXIST && overflow < BTRFS_KEY_OVERFLOW_MAX) {
+		overflow++;
+		btrfs_set_key_overflow(cpu_key, overflow);
+		btrfs_release_path(root, path);
+		ret = btrfs_insert_empty_item(trans, root, path, cpu_key,
+					      data_size);
+	}
+	return ret;
+}
+
 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 			  *root, const char *name, int name_len, u64 dir, u64
 			  objectid, u8 type)
@@ -23,7 +43,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 	path = btrfs_alloc_path();
 	btrfs_init_path(path);
 	data_size = sizeof(*dir_item) + name_len;
-	ret = btrfs_insert_empty_item(trans, root, path, &key, data_size);
+	ret = insert_with_overflow(trans, root, path, &key, data_size);
 	if (ret)
 		goto out;
 
@@ -41,7 +61,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 
 	btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
 	key.offset = objectid;
-	ret = btrfs_insert_empty_item(trans, root, path, &key, data_size);
+	ret = insert_with_overflow(trans, root, path, &key, data_size);
 	// FIXME clear the dirindex bit
 	if (ret)
 		goto out;
@@ -70,14 +90,40 @@ int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
 	struct btrfs_key key;
 	int ins_len = mod < 0 ? -1 : 0;
 	int cow = mod != 0;
+	struct btrfs_disk_key *found_key;
+	struct btrfs_leaf *leaf;
 
 	key.objectid = dir;
 	key.flags = 0;
 	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
+	btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
 	ret = btrfs_name_hash(name, name_len, &key.offset);
 	BUG_ON(ret);
-	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
-	return ret;
+	while(1) {
+		ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+		if (ret < 0)
+			return ret;
+		if (ret > 0) {
+			if (path->slots[0] == 0)
+				return 1;
+			path->slots[0]--;
+		}
+		leaf = btrfs_buffer_leaf(path->nodes[0]);
+		found_key = &leaf->items[path->slots[0]].key;
+
+		if (btrfs_disk_key_objectid(found_key) != dir ||
+		    btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
+		    btrfs_disk_key_offset(found_key) != key.offset)
+			return 1;
+
+		if (btrfs_match_dir_item_name(root, path, name, name_len))
+			return 0;
+
+		if (btrfs_disk_key_overflow(found_key) == 0)
+			return 1;
+		btrfs_release_path(root, path);
+	}
+	return 1;
 }
 
 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
@@ -89,13 +135,31 @@ int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
 	struct btrfs_key key;
 	int ins_len = mod < 0 ? -1 : 0;
 	int cow = mod != 0;
+	struct btrfs_disk_key *found_key;
+	struct btrfs_leaf *leaf;
 
 	key.objectid = dir;
 	key.flags = 0;
 	btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
+	btrfs_set_key_overflow(&key, BTRFS_KEY_OVERFLOW_MAX - 1);
 	key.offset = objectid;
 	ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
-	return ret;
+	if (ret < 0)
+		return ret;
+	if (ret > 0) {
+		if (path->slots[0] == 0)
+			return 1;
+		path->slots[0]--;
+	}
+	leaf = btrfs_buffer_leaf(path->nodes[0]);
+	found_key = &leaf->items[path->slots[0]].key;
+
+	if (btrfs_disk_key_objectid(found_key) != dir ||
+	    btrfs_disk_key_type(found_key) != BTRFS_DIR_INDEX_KEY)
+		return 1;
+	if (btrfs_disk_key_offset(found_key) == objectid)
+		return 0;
+	return 1;
 }
 
 int btrfs_match_dir_item_name(struct btrfs_root *root,