From 132db51b1f205ff2a85c9e44d44daab296b90e30 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Mon, 26 Mar 2007 11:24:42 -0400
Subject: [PATCH] generations on headers

---
 ctree.h       | 12 ++++++++++++
 extent-tree.c |  2 ++
 hasher.c      |  2 ++
 mkfs.c        |  1 +
 print-tree.c  | 13 +++++++++----
 5 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/ctree.h b/ctree.h
index c9361d83..569504e3 100644
--- a/ctree.h
+++ b/ctree.h
@@ -45,6 +45,7 @@ struct btrfs_key {
 struct btrfs_header {
 	u8 fsid[16]; /* FS specific uuid */
 	__le64 blocknr; /* which block this node is supposed to live in */
+	__le64 generation;
 	__le64 parentid; /* objectid of the tree root */
 	__le32 csum;
 	__le32 ham;
@@ -572,6 +573,17 @@ static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
 	h->blocknr = cpu_to_le64(blocknr);
 }
 
+static inline u64 btrfs_header_generation(struct btrfs_header *h)
+{
+	return le64_to_cpu(h->generation);
+}
+
+static inline void btrfs_set_header_generation(struct btrfs_header *h,
+					       u64 val)
+{
+	h->generation = cpu_to_le64(val);
+}
+
 static inline u64 btrfs_header_parentid(struct btrfs_header *h)
 {
 	return le64_to_cpu(h->parentid);
diff --git a/extent-tree.c b/extent-tree.c
index 9bc4ad38..06ecbe3c 100644
--- a/extent-tree.c
+++ b/extent-tree.c
@@ -459,6 +459,8 @@ struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 	}
 	buf = find_tree_block(root, ins.objectid);
 	dirty_tree_block(trans, root, buf);
+	btrfs_set_header_generation(&buf->node.header,
+				    root->root_key.offset + 1);
 	return buf;
 }
 
diff --git a/hasher.c b/hasher.c
index 96702da4..435dbfa5 100644
--- a/hasher.c
+++ b/hasher.c
@@ -15,6 +15,8 @@ int main() {
 			break;
 		if (strlen(line) == 0)
 			continue;
+		if (line[strlen(line)-1] == '\n')
+			line[strlen(line)-1] = '\0';
 		ret = btrfs_name_hash(line, strlen(line), &result);
 		BUG_ON(ret);
 		printf("hash returns %Lu\n", result);
diff --git a/mkfs.c b/mkfs.c
index f878e3e1..d8f99606 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -114,6 +114,7 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize)
 				  BTRFS_ROOT_TREE_OBJECTID);
 	btrfs_set_header_blocknr(&empty_leaf->header, start_block + 1);
 	btrfs_set_header_nritems(&empty_leaf->header, 3);
+	btrfs_set_header_generation(&empty_leaf->header, 0);
 
 	/* create the items for the root tree */
 	btrfs_set_root_blocknr(&root_item, start_block + 2);
diff --git a/print-tree.c b/print-tree.c
index caa07f5a..5259b6e9 100644
--- a/print-tree.c
+++ b/print-tree.c
@@ -17,9 +17,11 @@ void btrfs_print_leaf(struct btrfs_root *root, struct btrfs_leaf *l)
 	struct btrfs_inode_item *ii;
 	u32 type;
 
-	printf("leaf %Lu total ptrs %d free space %d\n",
+	printf("leaf %Lu ptrs %d free space %d parent %Lu generation %Lu\n",
 		btrfs_header_blocknr(&l->header), nr,
-		btrfs_leaf_free_space(root, l));
+		btrfs_leaf_free_space(root, l),
+		btrfs_header_parentid(&l->header),
+		btrfs_header_generation(&l->header));
 	fflush(stdout);
 	for (i = 0 ; i < nr ; i++) {
 		item = l->items + i;
@@ -87,9 +89,12 @@ void btrfs_print_tree(struct btrfs_root *root, struct btrfs_buffer *t)
 		btrfs_print_leaf(root, (struct btrfs_leaf *)c);
 		return;
 	}
-	printf("node %Lu level %d total ptrs %d free spc %u\n", t->blocknr,
+	printf("node %Lu level %d ptrs %d free %u parent %Lu generation %Lu\n",
+	       t->blocknr,
 	        btrfs_header_level(&c->header), nr,
-		(u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr);
+		(u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr,
+		btrfs_header_parentid(&c->header),
+		btrfs_header_generation(&c->header));
 	fflush(stdout);
 	for (i = 0; i < nr; i++) {
 		printf("\tkey %d (%Lu %u %Lu) block %Lu\n",