Btrfs: tweak the inode-map and free extent search starts on cold mount

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

5 files changed, 39 insertions, 13 deletions

diff --git a/fs/btrfs/TODO b/fs/btrfs/TODO
index e9371385ccc0..db986c46a554 100644
--- a/fs/btrfs/TODO
+++ b/fs/btrfs/TODO
@@ -1,9 +1,7 @@
 * cleanup, add more error checking, get rid of BUG_ONs
 * Fix ENOSPC handling
-* Do checksumming
 * Add block mapping tree (simple dm layer)
 * Make allocator smarter
-* make level a field in header
 * add a block group to struct inode
 * Make directory hashing work on 32 bit
 * Make sure nobh stuff is working properly for cows
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index d8e03bd797ff..41cc013ef08d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -238,7 +238,6 @@ struct btrfs_fs_info {
         struct radix_tree_root pending_del_radix;
         struct radix_tree_root pinned_radix;
         u64 last_inode_alloc;
-        u64 last_inode_alloc_dirid;
         u64 generation;
         struct btrfs_transaction *running_transaction;
         struct btrfs_super_block *disk_super;
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 055cd45e802e..de9ee3aa0aad 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -311,7 +311,6 @@ struct btrfs_root *open_ctree(struct super_block *sb)
         fs_info->extent_root = extent_root;
         fs_info->inode_root = inode_root;
         fs_info->last_inode_alloc = 0;
-        fs_info->last_inode_alloc_dirid = 0;
         fs_info->sb = sb;
         fs_info->btree_inode = new_inode(sb);
         fs_info->btree_inode->i_ino = 1;
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index cd40a08dd8a6..688aa861a928 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -339,13 +339,30 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
         int total_needed = num_blocks;
         int level;
 
+        path = btrfs_alloc_path();
+        ins->flags = 0;
+        btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
+
         level = btrfs_header_level(btrfs_buffer_header(root->node));
         total_needed += (level + 1) * 3;
+        if (root->fs_info->last_insert.objectid == 0 && search_end == (u64)-1) {
+                struct btrfs_disk_key *last_key;
+                btrfs_init_path(path);
+                ins->objectid = (u64)-1;
+                ins->offset = (u64)-1;
+                ret = btrfs_search_slot(trans, root, ins, path, 0, 0);
+                if (ret < 0)
+                        goto error;
+                BUG_ON(ret == 0);
+                if (path->slots[0] > 0)
+                        path->slots[0]--;
+                l = btrfs_buffer_leaf(path->nodes[0]);
+                last_key = &l->items[path->slots[0]].key;
+                search_start = btrfs_disk_key_objectid(last_key);
+        }
         if (root->fs_info->last_insert.objectid > search_start)
                 search_start = root->fs_info->last_insert.objectid;
 
-        ins->flags = 0;
-        btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
         path = btrfs_alloc_path();
 
 check_failed:
diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index b3de823eb628..329edb42897e 100644
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -22,17 +22,31 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
         struct btrfs_key search_key;
         u64 search_start = dirid;
 
-        if (fs_root->fs_info->last_inode_alloc_dirid == dirid)
-                search_start = fs_root->fs_info->last_inode_alloc;
+        path = btrfs_alloc_path();
+        BUG_ON(!path);
+        search_key.flags = 0;
+        btrfs_set_key_type(&search_key, BTRFS_INODE_MAP_ITEM_KEY);
 
+        search_start = fs_root->fs_info->last_inode_alloc;
+        if (search_start == 0) {
+                struct btrfs_disk_key *last_key;
+                btrfs_init_path(path);
+                search_key.objectid = (u64)-1;
+                search_key.offset = (u64)-1;
+                ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0);
+                if (ret < 0)
+                        goto error;
+                BUG_ON(ret == 0);
+                if (path->slots[0] > 0)
+                        path->slots[0]--;
+                l = btrfs_buffer_leaf(path->nodes[0]);
+                last_key = &l->items[path->slots[0]].key;
+                search_start = btrfs_disk_key_objectid(last_key);
+        }
         search_start = max(search_start, BTRFS_FIRST_FREE_OBJECTID);
         search_key.objectid = search_start;
-        search_key.flags = 0;
-        btrfs_set_key_type(&search_key, BTRFS_INODE_MAP_ITEM_KEY);
         search_key.offset = 0;
 
-        path = btrfs_alloc_path();
-        BUG_ON(!path);
         btrfs_init_path(path);
         start_found = 0;
         ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0);
@@ -79,7 +93,6 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
         // FIXME -ENOSPC
 found:
         root->fs_info->last_inode_alloc = *objectid;
-        root->fs_info->last_inode_alloc_dirid = dirid;
         btrfs_release_path(root, path);
         btrfs_free_path(path);
         BUG_ON(*objectid < search_start);