Hello,
Orphan items use BTRFS_ORPHAN_OBJECTID (-5UUL) as key objectid. This
affects the find free objectid functions, inode objectid can easily
overflow after orphan file cleanup.
---
diff -r 8fe9e10847fa ctree.h
--- a/ctree.h Thu Aug 28 06:21:17 2008 -0400
+++ b/ctree.h Tue Sep 02 01:41:40 2008 +0800
@@ -78,9 +78,10 @@
#define BTRFS_ORPHAN_OBJECTID -5ULL
/*
- * All files have objectids higher than this.
+ * All files have objectids in this range.
*/
#define BTRFS_FIRST_FREE_OBJECTID 256ULL
+#define BTRFS_LAST_FREE_OBJECTID -256ULL
#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
diff -r 8fe9e10847fa inode-map.c
--- a/inode-map.c Thu Aug 28 06:21:17 2008 -0400
+++ b/inode-map.c Tue Sep 02 01:41:40 2008 +0800
@@ -32,7 +32,8 @@
path = btrfs_alloc_path();
BUG_ON(!path);
- search_key.objectid = (u64)-1;
+ search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
+ search_key.type = -1;
search_key.offset = (u64)-1;
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
if (ret < 0)
@@ -70,16 +71,17 @@
u64 search_start = dirid;
mutex_lock(&root->objectid_mutex);
- if (root->last_inode_alloc) {
+ if (root->last_inode_alloc >= BTRFS_FIRST_FREE_OBJECTID &&
+ root->last_inode_alloc < BTRFS_LAST_FREE_OBJECTID) {
*objectid = ++root->last_inode_alloc;
mutex_unlock(&root->objectid_mutex);
return 0;
}
path = btrfs_alloc_path();
BUG_ON(!path);
- search_start = root->last_inode_alloc;
search_start = max(search_start, BTRFS_FIRST_FREE_OBJECTID);
search_key.objectid = search_start;
+ search_key.type = 0;
search_key.offset = 0;
btrfs_init_path(path);
@@ -87,9 +89,6 @@
ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0);
if (ret < 0)
goto error;
-
- if (path->slots[0] > 0)
- path->slots[0]--;
while (1) {
l = path->nodes[0];
@@ -120,13 +119,15 @@
}
}
}
+ if (key.objectid >= BTRFS_LAST_FREE_OBJECTID)
+ break;
start_found = 1;
last_ino = key.objectid + 1;
path->slots[0]++;
}
// FIXME -ENOSPC
+ BUG_ON(1);
found:
- root->last_inode_alloc = *objectid;
btrfs_release_path(root, path);
btrfs_free_path(path);
BUG_ON(*objectid < search_start);
--
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