1 files changed, 127 insertions, 7 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1a4a2a975926..05f4fb6e0607 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1225,6 +1225,82 @@ static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info)
         return root;
 }
 
+struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
+                                     struct btrfs_fs_info *fs_info,
+                                     u64 objectid)
+{
+        struct extent_buffer *leaf;
+        struct btrfs_root *tree_root = fs_info->tree_root;
+        struct btrfs_root *root;
+        struct btrfs_key key;
+        int ret = 0;
+        u64 bytenr;
+
+        root = btrfs_alloc_root(fs_info);
+        if (!root)
+                return ERR_PTR(-ENOMEM);
+
+        __setup_root(tree_root->nodesize, tree_root->leafsize,
+                     tree_root->sectorsize, tree_root->stripesize,
+                     root, fs_info, objectid);
+        root->root_key.objectid = objectid;
+        root->root_key.type = BTRFS_ROOT_ITEM_KEY;
+        root->root_key.offset = 0;
+
+        leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
+                                      0, objectid, NULL, 0, 0, 0);
+        if (IS_ERR(leaf)) {
+                ret = PTR_ERR(leaf);
+                goto fail;
+        }
+
+        bytenr = leaf->start;
+        memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
+        btrfs_set_header_bytenr(leaf, leaf->start);
+        btrfs_set_header_generation(leaf, trans->transid);
+        btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
+        btrfs_set_header_owner(leaf, objectid);
+        root->node = leaf;
+
+        write_extent_buffer(leaf, fs_info->fsid,
+                            (unsigned long)btrfs_header_fsid(leaf),
+                            BTRFS_FSID_SIZE);
+        write_extent_buffer(leaf, fs_info->chunk_tree_uuid,
+                            (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
+                            BTRFS_UUID_SIZE);
+        btrfs_mark_buffer_dirty(leaf);
+
+        root->commit_root = btrfs_root_node(root);
+        root->track_dirty = 1;
+
+
+        root->root_item.flags = 0;
+        root->root_item.byte_limit = 0;
+        btrfs_set_root_bytenr(&root->root_item, leaf->start);
+        btrfs_set_root_generation(&root->root_item, trans->transid);
+        btrfs_set_root_level(&root->root_item, 0);
+        btrfs_set_root_refs(&root->root_item, 1);
+        btrfs_set_root_used(&root->root_item, leaf->len);
+        btrfs_set_root_last_snapshot(&root->root_item, 0);
+        btrfs_set_root_dirid(&root->root_item, 0);
+        root->root_item.drop_level = 0;
+
+        key.objectid = objectid;
+        key.type = BTRFS_ROOT_ITEM_KEY;
+        key.offset = 0;
+        ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
+        if (ret)
+                goto fail;
+
+        btrfs_tree_unlock(leaf);
+
+fail:
+        if (ret)
+                return ERR_PTR(ret);
+
+        return root;
+}
+
 static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
                                          struct btrfs_fs_info *fs_info)
 {
@@ -1396,6 +1472,9 @@ struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
                 return fs_info->dev_root;
         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
                 return fs_info->csum_root;
+        if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
+                return fs_info->quota_root ? fs_info->quota_root :
+                                             ERR_PTR(-ENOENT);
 again:
         spin_lock(&fs_info->fs_roots_radix_lock);
         root = radix_tree_lookup(&fs_info->fs_roots_radix,
@@ -1823,6 +1902,10 @@ static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
         free_extent_buffer(info->extent_root->commit_root);
         free_extent_buffer(info->csum_root->node);
         free_extent_buffer(info->csum_root->commit_root);
+        if (info->quota_root) {
+                free_extent_buffer(info->quota_root->node);
+                free_extent_buffer(info->quota_root->commit_root);
+        }
 
         info->tree_root->node = NULL;
         info->tree_root->commit_root = NULL;
@@ -1832,6 +1915,10 @@ static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
         info->extent_root->commit_root = NULL;
         info->csum_root->node = NULL;
         info->csum_root->commit_root = NULL;
+        if (info->quota_root) {
+                info->quota_root->node = NULL;
+                info->quota_root->commit_root = NULL;
+        }
 
         if (chunk_root) {
                 free_extent_buffer(info->chunk_root->node);
@@ -1862,6 +1949,7 @@ int open_ctree(struct super_block *sb,
         struct btrfs_root *csum_root;
         struct btrfs_root *chunk_root;
         struct btrfs_root *dev_root;
+        struct btrfs_root *quota_root;
         struct btrfs_root *log_tree_root;
         int ret;
         int err = -EINVAL;
@@ -1873,9 +1961,10 @@ int open_ctree(struct super_block *sb,
         csum_root = fs_info->csum_root = btrfs_alloc_root(fs_info);
         chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info);
         dev_root = fs_info->dev_root = btrfs_alloc_root(fs_info);
+        quota_root = fs_info->quota_root = btrfs_alloc_root(fs_info);
 
         if (!tree_root || !extent_root || !csum_root ||
-            !chunk_root || !dev_root) {
+            !chunk_root || !dev_root || !quota_root) {
                 err = -ENOMEM;
                 goto fail;
         }
@@ -1944,6 +2033,8 @@ int open_ctree(struct super_block *sb,
         fs_info->free_chunk_space = 0;
         fs_info->tree_mod_log = RB_ROOT;
 
+        init_waitqueue_head(&fs_info->tree_mod_seq_wait);
+
         /* readahead state */
         INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT);
         spin_lock_init(&fs_info->reada_lock);
@@ -2032,6 +2123,13 @@ int open_ctree(struct super_block *sb,
         init_rwsem(&fs_info->cleanup_work_sem);
         init_rwsem(&fs_info->subvol_sem);
 
+        spin_lock_init(&fs_info->qgroup_lock);
+        fs_info->qgroup_tree = RB_ROOT;
+        INIT_LIST_HEAD(&fs_info->dirty_qgroups);
+        fs_info->qgroup_seq = 1;
+        fs_info->quota_enabled = 0;
+        fs_info->pending_quota_state = 0;
+
         btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
         btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
 
@@ -2356,6 +2454,17 @@ retry_root_backup:
                 goto recovery_tree_root;
         csum_root->track_dirty = 1;
 
+        ret = find_and_setup_root(tree_root, fs_info,
+                                  BTRFS_QUOTA_TREE_OBJECTID, quota_root);
+        if (ret) {
+                kfree(quota_root);
+                quota_root = fs_info->quota_root = NULL;
+        } else {
+                quota_root->track_dirty = 1;
+                fs_info->quota_enabled = 1;
+                fs_info->pending_quota_state = 1;
+        }
+
         fs_info->generation = generation;
         fs_info->last_trans_committed = generation;
 
@@ -2415,6 +2524,9 @@ retry_root_backup:
                                " integrity check module %s\n", sb->s_id);
         }
 #endif
+        ret = btrfs_read_qgroup_config(fs_info);
+        if (ret)
+                goto fail_trans_kthread;
 
         /* do not make disk changes in broken FS */
         if (btrfs_super_log_root(disk_super) != 0 &&
@@ -2425,7 +2537,7 @@ retry_root_backup:
                         printk(KERN_WARNING "Btrfs log replay required "
                                "on RO media\n");
                         err = -EIO;
-                        goto fail_trans_kthread;
+                        goto fail_qgroup;
                 }
                 blocksize =
                      btrfs_level_size(tree_root,
@@ -2434,7 +2546,7 @@ retry_root_backup:
                 log_tree_root = btrfs_alloc_root(fs_info);
                 if (!log_tree_root) {
                         err = -ENOMEM;
-                        goto fail_trans_kthread;
+                        goto fail_qgroup;
                 }
 
                 __setup_root(nodesize, leafsize, sectorsize, stripesize,
@@ -2474,7 +2586,7 @@ retry_root_backup:
                         printk(KERN_WARNING
                                "btrfs: failed to recover relocation\n");
                         err = -EINVAL;
-                        goto fail_trans_kthread;
+                        goto fail_qgroup;
                 }
         }
 
@@ -2484,10 +2596,10 @@ retry_root_backup:
 
         fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
         if (!fs_info->fs_root)
-                goto fail_trans_kthread;
+                goto fail_qgroup;
         if (IS_ERR(fs_info->fs_root)) {
                 err = PTR_ERR(fs_info->fs_root);
-                goto fail_trans_kthread;
+                goto fail_qgroup;
         }
 
         if (sb->s_flags & MS_RDONLY)
@@ -2511,6 +2623,8 @@ retry_root_backup:
 
         return 0;
 
+fail_qgroup:
+        btrfs_free_qgroup_config(fs_info);
 fail_trans_kthread:
         kthread_stop(fs_info->transaction_kthread);
 fail_cleaner:
@@ -3109,6 +3223,8 @@ int close_ctree(struct btrfs_root *root)
         fs_info->closing = 2;
         smp_mb();
 
+        btrfs_free_qgroup_config(root->fs_info);
+
         if (fs_info->delalloc_bytes) {
                 printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n",
                        (unsigned long long)fs_info->delalloc_bytes);
@@ -3128,6 +3244,10 @@ int close_ctree(struct btrfs_root *root)
         free_extent_buffer(fs_info->dev_root->commit_root);
         free_extent_buffer(fs_info->csum_root->node);
         free_extent_buffer(fs_info->csum_root->commit_root);
+        if (fs_info->quota_root) {
+                free_extent_buffer(fs_info->quota_root->node);
+                free_extent_buffer(fs_info->quota_root->commit_root);
+        }
 
         btrfs_free_block_groups(fs_info);
 
@@ -3258,7 +3378,7 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
         return btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
 }
 
-static int btree_lock_page_hook(struct page *page, void *data,
+int btree_lock_page_hook(struct page *page, void *data,
                                 void (*flush_fn)(void *))
 {
         struct inode *inode = page->mapping->host;