1 files changed, 281 insertions, 202 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b0292b3ead54..6b092a1c4e37 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1192,6 +1192,8 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
         root->objectid = objectid;
         root->last_trans = 0;
         root->highest_objectid = 0;
+        root->nr_delalloc_inodes = 0;
+        root->nr_ordered_extents = 0;
         root->name = NULL;
         root->inode_tree = RB_ROOT;
         INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
@@ -1200,10 +1202,16 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 
         INIT_LIST_HEAD(&root->dirty_list);
         INIT_LIST_HEAD(&root->root_list);
+        INIT_LIST_HEAD(&root->delalloc_inodes);
+        INIT_LIST_HEAD(&root->delalloc_root);
+        INIT_LIST_HEAD(&root->ordered_extents);
+        INIT_LIST_HEAD(&root->ordered_root);
         INIT_LIST_HEAD(&root->logged_list[0]);
         INIT_LIST_HEAD(&root->logged_list[1]);
         spin_lock_init(&root->orphan_lock);
         spin_lock_init(&root->inode_lock);
+        spin_lock_init(&root->delalloc_lock);
+        spin_lock_init(&root->ordered_extent_lock);
         spin_lock_init(&root->accounting_lock);
         spin_lock_init(&root->log_extents_lock[0]);
         spin_lock_init(&root->log_extents_lock[1]);
@@ -1217,6 +1225,7 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
         atomic_set(&root->log_writers, 0);
         atomic_set(&root->log_batch, 0);
         atomic_set(&root->orphan_inodes, 0);
+        atomic_set(&root->refs, 1);
         root->log_transid = 0;
         root->last_log_commit = 0;
         extent_io_tree_init(&root->dirty_log_pages,
@@ -1235,39 +1244,6 @@ static void __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
         spin_lock_init(&root->root_item_lock);
 }
 
-static int __must_check find_and_setup_root(struct btrfs_root *tree_root,
-                                            struct btrfs_fs_info *fs_info,
-                                            u64 objectid,
-                                            struct btrfs_root *root)
-{
-        int ret;
-        u32 blocksize;
-        u64 generation;
-
-        __setup_root(tree_root->nodesize, tree_root->leafsize,
-                     tree_root->sectorsize, tree_root->stripesize,
-                     root, fs_info, objectid);
-        ret = btrfs_find_last_root(tree_root, objectid,
-                                   &root->root_item, &root->root_key);
-        if (ret > 0)
-                return -ENOENT;
-        else if (ret < 0)
-                return ret;
-
-        generation = btrfs_root_generation(&root->root_item);
-        blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
-        root->commit_root = NULL;
-        root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
-                                     blocksize, generation);
-        if (!root->node || !btrfs_buffer_uptodate(root->node, generation, 0)) {
-                free_extent_buffer(root->node);
-                root->node = NULL;
-                return -EIO;
-        }
-        root->commit_root = btrfs_root_node(root);
-        return 0;
-}
-
 static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info)
 {
         struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS);
@@ -1452,70 +1428,73 @@ int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
         return 0;
 }
 
-struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
-                                               struct btrfs_key *location)
+struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
+                                        struct btrfs_key *key)
 {
         struct btrfs_root *root;
         struct btrfs_fs_info *fs_info = tree_root->fs_info;
         struct btrfs_path *path;
-        struct extent_buffer *l;
         u64 generation;
         u32 blocksize;
-        int ret = 0;
-        int slot;
+        int ret;
 
-        root = btrfs_alloc_root(fs_info);
-        if (!root)
+        path = btrfs_alloc_path();
+        if (!path)
                 return ERR_PTR(-ENOMEM);
-        if (location->offset == (u64)-1) {
-                ret = find_and_setup_root(tree_root, fs_info,
-                                          location->objectid, root);
-                if (ret) {
-                        kfree(root);
-                        return ERR_PTR(ret);
-                }
-                goto out;
+
+        root = btrfs_alloc_root(fs_info);
+        if (!root) {
+                ret = -ENOMEM;
+                goto alloc_fail;
         }
 
         __setup_root(tree_root->nodesize, tree_root->leafsize,
                      tree_root->sectorsize, tree_root->stripesize,
-                     root, fs_info, location->objectid);
+                     root, fs_info, key->objectid);
 
-        path = btrfs_alloc_path();
-        if (!path) {
-                kfree(root);
-                return ERR_PTR(-ENOMEM);
-        }
-        ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
-        if (ret == 0) {
-                l = path->nodes[0];
-                slot = path->slots[0];
-                btrfs_read_root_item(l, slot, &root->root_item);
-                memcpy(&root->root_key, location, sizeof(*location));
-        }
-        btrfs_free_path(path);
+        ret = btrfs_find_root(tree_root, key, path,
+                              &root->root_item, &root->root_key);
         if (ret) {
-                kfree(root);
                 if (ret > 0)
                         ret = -ENOENT;
-                return ERR_PTR(ret);
+                goto find_fail;
         }
 
         generation = btrfs_root_generation(&root->root_item);
         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
                                      blocksize, generation);
-        if (!root->node || !extent_buffer_uptodate(root->node)) {
-                ret = (!root->node) ? -ENOMEM : -EIO;
-
-                free_extent_buffer(root->node);
-                kfree(root);
-                return ERR_PTR(ret);
+        if (!root->node) {
+                ret = -ENOMEM;
+                goto find_fail;
+        } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
+                ret = -EIO;
+                goto read_fail;
         }
-
         root->commit_root = btrfs_root_node(root);
 out:
-        if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
+        btrfs_free_path(path);
+        return root;
+
+read_fail:
+        free_extent_buffer(root->node);
+find_fail:
+        kfree(root);
+alloc_fail:
+        root = ERR_PTR(ret);
+        goto out;
+}
+
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
+                                      struct btrfs_key *location)
+{
+        struct btrfs_root *root;
+
+        root = btrfs_read_tree_root(tree_root, location);
+        if (IS_ERR(root))
+                return root;
+
+        if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
                 root->ref_cows = 1;
                 btrfs_check_and_init_root_item(&root->root_item);
         }
@@ -1523,6 +1502,66 @@ out:
         return root;
 }
 
+int btrfs_init_fs_root(struct btrfs_root *root)
+{
+        int ret;
+
+        root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
+        root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
+                                        GFP_NOFS);
+        if (!root->free_ino_pinned || !root->free_ino_ctl) {
+                ret = -ENOMEM;
+                goto fail;
+        }
+
+        btrfs_init_free_ino_ctl(root);
+        mutex_init(&root->fs_commit_mutex);
+        spin_lock_init(&root->cache_lock);
+        init_waitqueue_head(&root->cache_wait);
+
+        ret = get_anon_bdev(&root->anon_dev);
+        if (ret)
+                goto fail;
+        return 0;
+fail:
+        kfree(root->free_ino_ctl);
+        kfree(root->free_ino_pinned);
+        return ret;
+}
+
+struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
+                                        u64 root_id)
+{
+        struct btrfs_root *root;
+
+        spin_lock(&fs_info->fs_roots_radix_lock);
+        root = radix_tree_lookup(&fs_info->fs_roots_radix,
+                                 (unsigned long)root_id);
+        spin_unlock(&fs_info->fs_roots_radix_lock);
+        return root;
+}
+
+int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
+                         struct btrfs_root *root)
+{
+        int ret;
+
+        ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
+        if (ret)
+                return ret;
+
+        spin_lock(&fs_info->fs_roots_radix_lock);
+        ret = radix_tree_insert(&fs_info->fs_roots_radix,
+                                (unsigned long)root->root_key.objectid,
+                                root);
+        if (ret == 0)
+                root->in_radix = 1;
+        spin_unlock(&fs_info->fs_roots_radix_lock);
+        radix_tree_preload_end();
+
+        return ret;
+}
+
 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
                                               struct btrfs_key *location)
 {
@@ -1543,58 +1582,30 @@ struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
                 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,
-                                 (unsigned long)location->objectid);
-        spin_unlock(&fs_info->fs_roots_radix_lock);
+        root = btrfs_lookup_fs_root(fs_info, location->objectid);
         if (root)
                 return root;
 
-        root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
+        root = btrfs_read_fs_root(fs_info->tree_root, location);
         if (IS_ERR(root))
                 return root;
 
-        root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
-        root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
-                                        GFP_NOFS);
-        if (!root->free_ino_pinned || !root->free_ino_ctl) {
-                ret = -ENOMEM;
+        if (btrfs_root_refs(&root->root_item) == 0) {
+                ret = -ENOENT;
                 goto fail;
         }
 
-        btrfs_init_free_ino_ctl(root);
-        mutex_init(&root->fs_commit_mutex);
-        spin_lock_init(&root->cache_lock);
-        init_waitqueue_head(&root->cache_wait);
-
-        ret = get_anon_bdev(&root->anon_dev);
+        ret = btrfs_init_fs_root(root);
         if (ret)
                 goto fail;
 
-        if (btrfs_root_refs(&root->root_item) == 0) {
-                ret = -ENOENT;
-                goto fail;
-        }
-
         ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
         if (ret < 0)
                 goto fail;
         if (ret == 0)
                 root->orphan_item_inserted = 1;
 
-        ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
-        if (ret)
-                goto fail;
-
-        spin_lock(&fs_info->fs_roots_radix_lock);
-        ret = radix_tree_insert(&fs_info->fs_roots_radix,
-                                (unsigned long)root->root_key.objectid,
-                                root);
-        if (ret == 0)
-                root->in_radix = 1;
-
-        spin_unlock(&fs_info->fs_roots_radix_lock);
-        radix_tree_preload_end();
+        ret = btrfs_insert_fs_root(fs_info, root);
         if (ret) {
                 if (ret == -EEXIST) {
                         free_fs_root(root);
@@ -1602,10 +1613,6 @@ again:
                 }
                 goto fail;
         }
-
-        ret = btrfs_find_dead_roots(fs_info->tree_root,
-                                    root->root_key.objectid);
-        WARN_ON(ret);
         return root;
 fail:
         free_fs_root(root);
@@ -1677,21 +1684,37 @@ static void end_workqueue_fn(struct btrfs_work *work)
 static int cleaner_kthread(void *arg)
 {
         struct btrfs_root *root = arg;
+        int again;
 
         do {
-                int again = 0;
-
-                if (!(root->fs_info->sb->s_flags & MS_RDONLY) &&
-                    down_read_trylock(&root->fs_info->sb->s_umount)) {
-                        if (mutex_trylock(&root->fs_info->cleaner_mutex)) {
-                                btrfs_run_delayed_iputs(root);
-                                again = btrfs_clean_one_deleted_snapshot(root);
-                                mutex_unlock(&root->fs_info->cleaner_mutex);
-                        }
-                        btrfs_run_defrag_inodes(root->fs_info);
-                        up_read(&root->fs_info->sb->s_umount);
+                again = 0;
+
+                /* Make the cleaner go to sleep early. */
+                if (btrfs_need_cleaner_sleep(root))
+                        goto sleep;
+
+                if (!mutex_trylock(&root->fs_info->cleaner_mutex))
+                        goto sleep;
+
+                /*
+                 * Avoid the problem that we change the status of the fs
+                 * during the above check and trylock.
+                 */
+                if (btrfs_need_cleaner_sleep(root)) {
+                        mutex_unlock(&root->fs_info->cleaner_mutex);
+                        goto sleep;
                 }
 
+                btrfs_run_delayed_iputs(root);
+                again = btrfs_clean_one_deleted_snapshot(root);
+                mutex_unlock(&root->fs_info->cleaner_mutex);
+
+                /*
+                 * The defragger has dealt with the R/O remount and umount,
+                 * needn't do anything special here.
+                 */
+                btrfs_run_defrag_inodes(root->fs_info);
+sleep:
                 if (!try_to_freeze() && !again) {
                         set_current_state(TASK_INTERRUPTIBLE);
                         if (!kthread_should_stop())
@@ -1725,7 +1748,7 @@ static int transaction_kthread(void *arg)
                 }
 
                 now = get_seconds();
-                if (!cur->blocked &&
+                if (cur->state < TRANS_STATE_BLOCKED &&
                     (now < cur->start_time || now - cur->start_time < 30)) {
                         spin_unlock(&root->fs_info->trans_lock);
                         delay = HZ * 5;
@@ -2035,11 +2058,11 @@ static void del_fs_roots(struct btrfs_fs_info *fs_info)
                 list_del(&gang[0]->root_list);
 
                 if (gang[0]->in_radix) {
-                        btrfs_free_fs_root(fs_info, gang[0]);
+                        btrfs_drop_and_free_fs_root(fs_info, gang[0]);
                 } else {
                         free_extent_buffer(gang[0]->node);
                         free_extent_buffer(gang[0]->commit_root);
-                        kfree(gang[0]);
+                        btrfs_put_fs_root(gang[0]);
                 }
         }
 
@@ -2050,7 +2073,7 @@ static void del_fs_roots(struct btrfs_fs_info *fs_info)
                 if (!ret)
                         break;
                 for (i = 0; i < ret; i++)
-                        btrfs_free_fs_root(fs_info, gang[i]);
+                        btrfs_drop_and_free_fs_root(fs_info, gang[i]);
         }
 }
 
@@ -2082,14 +2105,8 @@ int open_ctree(struct super_block *sb,
         int backup_index = 0;
 
         tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info);
-        extent_root = fs_info->extent_root = btrfs_alloc_root(fs_info);
-        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 || !quota_root) {
+        if (!tree_root || !chunk_root) {
                 err = -ENOMEM;
                 goto fail;
         }
@@ -2132,9 +2149,9 @@ int open_ctree(struct super_block *sb,
         INIT_LIST_HEAD(&fs_info->trans_list);
         INIT_LIST_HEAD(&fs_info->dead_roots);
         INIT_LIST_HEAD(&fs_info->delayed_iputs);
-        INIT_LIST_HEAD(&fs_info->delalloc_inodes);
+        INIT_LIST_HEAD(&fs_info->delalloc_roots);
         INIT_LIST_HEAD(&fs_info->caching_block_groups);
-        spin_lock_init(&fs_info->delalloc_lock);
+        spin_lock_init(&fs_info->delalloc_root_lock);
         spin_lock_init(&fs_info->trans_lock);
         spin_lock_init(&fs_info->fs_roots_radix_lock);
         spin_lock_init(&fs_info->delayed_iput_lock);
@@ -2170,7 +2187,6 @@ int open_ctree(struct super_block *sb,
         fs_info->max_inline = 8192 * 1024;
         fs_info->metadata_ratio = 0;
         fs_info->defrag_inodes = RB_ROOT;
-        fs_info->trans_no_join = 0;
         fs_info->free_chunk_space = 0;
         fs_info->tree_mod_log = RB_ROOT;
 
@@ -2181,8 +2197,8 @@ int open_ctree(struct super_block *sb,
         fs_info->thread_pool_size = min_t(unsigned long,
                                           num_online_cpus() + 2, 8);
 
-        INIT_LIST_HEAD(&fs_info->ordered_extents);
-        spin_lock_init(&fs_info->ordered_extent_lock);
+        INIT_LIST_HEAD(&fs_info->ordered_roots);
+        spin_lock_init(&fs_info->ordered_root_lock);
         fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
                                         GFP_NOFS);
         if (!fs_info->delayed_root) {
@@ -2275,6 +2291,7 @@ int open_ctree(struct super_block *sb,
         fs_info->qgroup_seq = 1;
         fs_info->quota_enabled = 0;
         fs_info->pending_quota_state = 0;
+        fs_info->qgroup_ulist = NULL;
         mutex_init(&fs_info->qgroup_rescan_lock);
 
         btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
@@ -2639,33 +2656,44 @@ retry_root_backup:
         btrfs_set_root_node(&tree_root->root_item, tree_root->node);
         tree_root->commit_root = btrfs_root_node(tree_root);
 
-        ret = find_and_setup_root(tree_root, fs_info,
-                                  BTRFS_EXTENT_TREE_OBJECTID, extent_root);
-        if (ret)
+        location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
+        location.type = BTRFS_ROOT_ITEM_KEY;
+        location.offset = 0;
+
+        extent_root = btrfs_read_tree_root(tree_root, &location);
+        if (IS_ERR(extent_root)) {
+                ret = PTR_ERR(extent_root);
                 goto recovery_tree_root;
+        }
         extent_root->track_dirty = 1;
+        fs_info->extent_root = extent_root;
 
-        ret = find_and_setup_root(tree_root, fs_info,
-                                  BTRFS_DEV_TREE_OBJECTID, dev_root);
-        if (ret)
+        location.objectid = BTRFS_DEV_TREE_OBJECTID;
+        dev_root = btrfs_read_tree_root(tree_root, &location);
+        if (IS_ERR(dev_root)) {
+                ret = PTR_ERR(dev_root);
                 goto recovery_tree_root;
+        }
         dev_root->track_dirty = 1;
+        fs_info->dev_root = dev_root;
+        btrfs_init_devices_late(fs_info);
 
-        ret = find_and_setup_root(tree_root, fs_info,
-                                  BTRFS_CSUM_TREE_OBJECTID, csum_root);
-        if (ret)
+        location.objectid = BTRFS_CSUM_TREE_OBJECTID;
+        csum_root = btrfs_read_tree_root(tree_root, &location);
+        if (IS_ERR(csum_root)) {
+                ret = PTR_ERR(csum_root);
                 goto recovery_tree_root;
+        }
         csum_root->track_dirty = 1;
+        fs_info->csum_root = csum_root;
 
-        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 {
+        location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
+        quota_root = btrfs_read_tree_root(tree_root, &location);
+        if (!IS_ERR(quota_root)) {
                 quota_root->track_dirty = 1;
                 fs_info->quota_enabled = 1;
                 fs_info->pending_quota_state = 1;
+                fs_info->quota_root = quota_root;
         }
 
         fs_info->generation = generation;
@@ -2818,11 +2846,9 @@ retry_root_backup:
 
         location.objectid = BTRFS_FS_TREE_OBJECTID;
         location.type = BTRFS_ROOT_ITEM_KEY;
-        location.offset = (u64)-1;
+        location.offset = 0;
 
         fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
-        if (!fs_info->fs_root)
-                goto fail_qgroup;
         if (IS_ERR(fs_info->fs_root)) {
                 err = PTR_ERR(fs_info->fs_root);
                 goto fail_qgroup;
@@ -2854,6 +2880,8 @@ retry_root_backup:
                 return ret;
         }
 
+        btrfs_qgroup_rescan_resume(fs_info);
+
         return 0;
 
 fail_qgroup:
@@ -3259,7 +3287,7 @@ int btrfs_calc_num_tolerated_disk_barrier_failures(
                                             BTRFS_BLOCK_GROUP_RAID10)) {
                                                 num_tolerated_disk_barrier_failures = 1;
                                         } else if (flags &
-                                                   BTRFS_BLOCK_GROUP_RAID5) {
+                                                   BTRFS_BLOCK_GROUP_RAID6) {
                                                 num_tolerated_disk_barrier_failures = 2;
                                         }
                                 }
@@ -3367,7 +3395,9 @@ int write_ctree_super(struct btrfs_trans_handle *trans,
         return ret;
 }
 
-void btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
+/* Drop a fs root from the radix tree and free it. */
+void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
+                                  struct btrfs_root *root)
 {
         spin_lock(&fs_info->fs_roots_radix_lock);
         radix_tree_delete(&fs_info->fs_roots_radix,
@@ -3398,7 +3428,12 @@ static void free_fs_root(struct btrfs_root *root)
         kfree(root->free_ino_ctl);
         kfree(root->free_ino_pinned);
         kfree(root->name);
-        kfree(root);
+        btrfs_put_fs_root(root);
+}
+
+void btrfs_free_fs_root(struct btrfs_root *root)
+{
+        free_fs_root(root);
 }
 
 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
@@ -3654,7 +3689,7 @@ static void btrfs_destroy_ordered_operations(struct btrfs_transaction *t,
         INIT_LIST_HEAD(&splice);
 
         mutex_lock(&root->fs_info->ordered_operations_mutex);
-        spin_lock(&root->fs_info->ordered_extent_lock);
+        spin_lock(&root->fs_info->ordered_root_lock);
 
         list_splice_init(&t->ordered_operations, &splice);
         while (!list_empty(&splice)) {
@@ -3662,14 +3697,14 @@ static void btrfs_destroy_ordered_operations(struct btrfs_transaction *t,
                                          ordered_operations);
 
                 list_del_init(&btrfs_inode->ordered_operations);
-                spin_unlock(&root->fs_info->ordered_extent_lock);
+                spin_unlock(&root->fs_info->ordered_root_lock);
 
                 btrfs_invalidate_inodes(btrfs_inode->root);
 
-                spin_lock(&root->fs_info->ordered_extent_lock);
+                spin_lock(&root->fs_info->ordered_root_lock);
         }
 
-        spin_unlock(&root->fs_info->ordered_extent_lock);
+        spin_unlock(&root->fs_info->ordered_root_lock);
         mutex_unlock(&root->fs_info->ordered_operations_mutex);
 }
 
@@ -3677,15 +3712,36 @@ static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
 {
         struct btrfs_ordered_extent *ordered;
 
-        spin_lock(&root->fs_info->ordered_extent_lock);
+        spin_lock(&root->ordered_extent_lock);
         /*
          * This will just short circuit the ordered completion stuff which will
          * make sure the ordered extent gets properly cleaned up.
          */
-        list_for_each_entry(ordered, &root->fs_info->ordered_extents,
+        list_for_each_entry(ordered, &root->ordered_extents,
                             root_extent_list)
                 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
-        spin_unlock(&root->fs_info->ordered_extent_lock);
+        spin_unlock(&root->ordered_extent_lock);
+}
+
+static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
+{
+        struct btrfs_root *root;
+        struct list_head splice;
+
+        INIT_LIST_HEAD(&splice);
+
+        spin_lock(&fs_info->ordered_root_lock);
+        list_splice_init(&fs_info->ordered_roots, &splice);
+        while (!list_empty(&splice)) {
+                root = list_first_entry(&splice, struct btrfs_root,
+                                        ordered_root);
+                list_del_init(&root->ordered_root);
+
+                btrfs_destroy_ordered_extents(root);
+
+                cond_resched_lock(&fs_info->ordered_root_lock);
+        }
+        spin_unlock(&fs_info->ordered_root_lock);
 }
 
 int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
@@ -3707,6 +3763,7 @@ int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
 
         while ((node = rb_first(&delayed_refs->root)) != NULL) {
                 struct btrfs_delayed_ref_head *head = NULL;
+                bool pin_bytes = false;
 
                 ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
                 atomic_set(&ref->refs, 1);
@@ -3727,8 +3784,7 @@ int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
                         }
 
                         if (head->must_insert_reserved)
-                                btrfs_pin_extent(root, ref->bytenr,
-                                                 ref->num_bytes, 1);
+                                pin_bytes = true;
                         btrfs_free_delayed_extent_op(head->extent_op);
                         delayed_refs->num_heads--;
                         if (list_empty(&head->cluster))
@@ -3739,9 +3795,13 @@ int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
                 ref->in_tree = 0;
                 rb_erase(&ref->rb_node, &delayed_refs->root);
                 delayed_refs->num_entries--;
-                if (head)
-                        mutex_unlock(&head->mutex);
                 spin_unlock(&delayed_refs->lock);
+                if (head) {
+                        if (pin_bytes)
+                                btrfs_pin_extent(root, ref->bytenr,
+                                                 ref->num_bytes, 1);
+                        mutex_unlock(&head->mutex);
+                }
                 btrfs_put_delayed_ref(ref);
 
                 cond_resched();
@@ -3778,24 +3838,49 @@ static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
 
         INIT_LIST_HEAD(&splice);
 
-        spin_lock(&root->fs_info->delalloc_lock);
-        list_splice_init(&root->fs_info->delalloc_inodes, &splice);
+        spin_lock(&root->delalloc_lock);
+        list_splice_init(&root->delalloc_inodes, &splice);
 
         while (!list_empty(&splice)) {
-                btrfs_inode = list_entry(splice.next, struct btrfs_inode,
-                                    delalloc_inodes);
+                btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
+                                               delalloc_inodes);
 
                 list_del_init(&btrfs_inode->delalloc_inodes);
                 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
                           &btrfs_inode->runtime_flags);
-                spin_unlock(&root->fs_info->delalloc_lock);
+                spin_unlock(&root->delalloc_lock);
 
                 btrfs_invalidate_inodes(btrfs_inode->root);
 
-                spin_lock(&root->fs_info->delalloc_lock);
+                spin_lock(&root->delalloc_lock);
         }
 
-        spin_unlock(&root->fs_info->delalloc_lock);
+        spin_unlock(&root->delalloc_lock);
+}
+
+static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
+{
+        struct btrfs_root *root;
+        struct list_head splice;
+
+        INIT_LIST_HEAD(&splice);
+
+        spin_lock(&fs_info->delalloc_root_lock);
+        list_splice_init(&fs_info->delalloc_roots, &splice);
+        while (!list_empty(&splice)) {
+                root = list_first_entry(&splice, struct btrfs_root,
+                                         delalloc_root);
+                list_del_init(&root->delalloc_root);
+                root = btrfs_grab_fs_root(root);
+                BUG_ON(!root);
+                spin_unlock(&fs_info->delalloc_root_lock);
+
+                btrfs_destroy_delalloc_inodes(root);
+                btrfs_put_fs_root(root);
+
+                spin_lock(&fs_info->delalloc_root_lock);
+        }
+        spin_unlock(&fs_info->delalloc_root_lock);
 }
 
 static int btrfs_destroy_marked_extents(struct btrfs_root *root,
@@ -3879,19 +3964,14 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
         btrfs_block_rsv_release(root, &root->fs_info->trans_block_rsv,
                                 cur_trans->dirty_pages.dirty_bytes);
 
-        /* FIXME: cleanup wait for commit */
-        cur_trans->in_commit = 1;
-        cur_trans->blocked = 1;
+        cur_trans->state = TRANS_STATE_COMMIT_START;
         wake_up(&root->fs_info->transaction_blocked_wait);
 
         btrfs_evict_pending_snapshots(cur_trans);
 
-        cur_trans->blocked = 0;
+        cur_trans->state = TRANS_STATE_UNBLOCKED;
         wake_up(&root->fs_info->transaction_wait);
 
-        cur_trans->commit_done = 1;
-        wake_up(&cur_trans->commit_wait);
-
         btrfs_destroy_delayed_inodes(root);
         btrfs_assert_delayed_root_empty(root);
 
@@ -3900,6 +3980,9 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
         btrfs_destroy_pinned_extent(root,
                                     root->fs_info->pinned_extents);
 
+        cur_trans->state =TRANS_STATE_COMPLETED;
+        wake_up(&cur_trans->commit_wait);
+
         /*
         memset(cur_trans, 0, sizeof(*cur_trans));
         kmem_cache_free(btrfs_transaction_cachep, cur_trans);
@@ -3915,7 +3998,7 @@ static int btrfs_cleanup_transaction(struct btrfs_root *root)
 
         spin_lock(&root->fs_info->trans_lock);
         list_splice_init(&root->fs_info->trans_list, &list);
-        root->fs_info->trans_no_join = 1;
+        root->fs_info->running_transaction = NULL;
         spin_unlock(&root->fs_info->trans_lock);
 
         while (!list_empty(&list)) {
@@ -3923,37 +4006,31 @@ static int btrfs_cleanup_transaction(struct btrfs_root *root)
 
                 btrfs_destroy_ordered_operations(t, root);
 
-                btrfs_destroy_ordered_extents(root);
+                btrfs_destroy_all_ordered_extents(root->fs_info);
 
                 btrfs_destroy_delayed_refs(t, root);
 
-                /* FIXME: cleanup wait for commit */
-                t->in_commit = 1;
-                t->blocked = 1;
+                /*
+                 *  FIXME: cleanup wait for commit
+                 *  We needn't acquire the lock here, because we are during
+                 *  the umount, there is no other task which will change it.
+                 */
+                t->state = TRANS_STATE_COMMIT_START;
                 smp_mb();
                 if (waitqueue_active(&root->fs_info->transaction_blocked_wait))
                         wake_up(&root->fs_info->transaction_blocked_wait);
 
                 btrfs_evict_pending_snapshots(t);
 
-                t->blocked = 0;
+                t->state = TRANS_STATE_UNBLOCKED;
                 smp_mb();
                 if (waitqueue_active(&root->fs_info->transaction_wait))
                         wake_up(&root->fs_info->transaction_wait);
 
-                t->commit_done = 1;
-                smp_mb();
-                if (waitqueue_active(&t->commit_wait))
-                        wake_up(&t->commit_wait);
-
                 btrfs_destroy_delayed_inodes(root);
                 btrfs_assert_delayed_root_empty(root);
 
-                btrfs_destroy_delalloc_inodes(root);
-
-                spin_lock(&root->fs_info->trans_lock);
-                root->fs_info->running_transaction = NULL;
-                spin_unlock(&root->fs_info->trans_lock);
+                btrfs_destroy_all_delalloc_inodes(root->fs_info);
 
                 btrfs_destroy_marked_extents(root, &t->dirty_pages,
                                              EXTENT_DIRTY);
@@ -3961,15 +4038,17 @@ static int btrfs_cleanup_transaction(struct btrfs_root *root)
                 btrfs_destroy_pinned_extent(root,
                                             root->fs_info->pinned_extents);
 
+                t->state = TRANS_STATE_COMPLETED;
+                smp_mb();
+                if (waitqueue_active(&t->commit_wait))
+                        wake_up(&t->commit_wait);
+
                 atomic_set(&t->use_count, 0);
                 list_del_init(&t->list);
                 memset(t, 0, sizeof(*t));
                 kmem_cache_free(btrfs_transaction_cachep, t);
         }
 
-        spin_lock(&root->fs_info->trans_lock);
-        root->fs_info->trans_no_join = 0;
-        spin_unlock(&root->fs_info->trans_lock);
         mutex_unlock(&root->fs_info->transaction_kthread_mutex);
 
         return 0;