Btrfs: add compat ioctl

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

fs/btrfs/TODO

@@ -7,7 +7,6 @@
 * Get rid of struct ctree_path, limiting tree levels held at one time
 * Add generation number to key pointer in nodes
 * Add generation number to inode
-* Add ability to switch a block group from data to metadata or vice versa
 * forbid cross subvolume renames and hardlinks
 * Release
 * Do real tree locking

fs/btrfs/ctree.h

@@ -3,7 +3,7 @@
 
 #include <linux/fs.h>
 #include <linux/buffer_head.h>
-#include <linux/kobject.h>
+#include <linux/workqueue.h>
 #include "bit-radix.h"
 
 struct btrfs_trans_handle;
@@ -281,6 +281,7 @@ struct btrfs_block_group_cache {
 };
 
 struct crypto_hash;
+
 struct btrfs_fs_info {
 	struct btrfs_root *extent_root;
 	struct btrfs_root *tree_root;
@@ -308,9 +309,9 @@ struct btrfs_fs_info {
 	struct mutex fs_mutex;
 	struct list_head trans_list;
 	struct crypto_hash *hash_tfm;
+	struct delayed_work trans_work;
 	spinlock_t hash_lock;
 	int do_barriers;
-	struct kobject kobj;
 };
 
 /*

fs/btrfs/disk-io.c

@@ -577,6 +577,7 @@ struct btrfs_root *open_ctree(struct super_block *sb)
 	fs_info->do_barriers = 1;
 	fs_info->extent_tree_insert_nr = 0;
 	fs_info->extent_tree_prealloc_nr = 0;
+	INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
 	BTRFS_I(fs_info->btree_inode)->root = tree_root;
 	memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
 	       sizeof(struct btrfs_key));
@@ -648,7 +649,6 @@ struct btrfs_root *open_ctree(struct super_block *sb)
 	btrfs_read_block_groups(extent_root);
 
 	fs_info->generation = btrfs_super_generation(disk_super) + 1;
-	memset(&fs_info->kobj, 0, sizeof(fs_info->kobj));
 	mutex_unlock(&fs_info->fs_mutex);
 	return tree_root;
 }
@@ -746,6 +746,7 @@ int close_ctree(struct btrfs_root *root)
 	struct btrfs_trans_handle *trans;
 	struct btrfs_fs_info *fs_info = root->fs_info;
 
+	btrfs_transaction_flush_work(root);
 	mutex_lock(&fs_info->fs_mutex);
 	trans = btrfs_start_transaction(root, 1);
 	btrfs_commit_transaction(trans, root);
@@ -776,7 +777,6 @@ int close_ctree(struct btrfs_root *root)
 	del_fs_roots(fs_info);
 	kfree(fs_info->extent_root);
 	kfree(fs_info->tree_root);
-	kobject_unregister(&fs_info->kobj);
 	return 0;
 }
 

fs/btrfs/super.c

@@ -12,6 +12,7 @@
 #include <linux/swap.h>
 #include <linux/writeback.h>
 #include <linux/statfs.h>
+#include <linux/compat.h>
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
@@ -950,7 +951,7 @@ static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
 		return -ENOMEM;
 	}
 	sb->s_root = root_dentry;
-
+	btrfs_transaction_queue_work(tree_root, HZ * 30);
 	return 0;
 }
 
@@ -1452,7 +1453,7 @@ static int btrfs_prepare_write(struct file *file, struct page *page,
 
 static void btrfs_write_super(struct super_block *sb)
 {
-	btrfs_sync_fs(sb, 1);
+	sb->s_dirt = 0;
 }
 
 static int btrfs_readpage(struct file *file, struct page *page)
@@ -2698,6 +2699,20 @@ static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+static long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
+			       unsigned long arg)
+{
+	struct inode *inode = file->f_path.dentry->d_inode;
+	int ret;
+	lock_kernel();
+	ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
+	unlock_kernel();
+	return ret;
+
+}
+#endif
+
 static struct kmem_cache *btrfs_inode_cachep;
 struct kmem_cache *btrfs_trans_handle_cachep;
 struct kmem_cache *btrfs_transaction_cachep;
@@ -3042,6 +3057,9 @@ static struct file_operations btrfs_dir_file_operations = {
 	.read		= generic_read_dir,
 	.readdir	= btrfs_readdir,
 	.ioctl		= btrfs_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= btrfs_compat_ioctl,
+#endif
 };
 
 static struct address_space_operations btrfs_aops = {
@@ -3073,6 +3091,9 @@ static struct file_operations btrfs_file_operations = {
 	.open		= generic_file_open,
 	.ioctl		= btrfs_ioctl,
 	.fsync		= btrfs_sync_file,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= btrfs_compat_ioctl,
+#endif
 };
 
 static struct inode_operations btrfs_symlink_inode_operations = {
@@ -3085,6 +3106,7 @@ static int __init init_btrfs_fs(void)
 {
 	int err;
 	printk("btrfs loaded!\n");
+	btrfs_init_transaction_sys();
 	err = init_inodecache();
 	if (err)
 		return err;
@@ -3095,6 +3117,7 @@ static int __init init_btrfs_fs(void)
 
 static void __exit exit_btrfs_fs(void)
 {
+	btrfs_exit_transaction_sys();
 	destroy_inodecache();
 	unregister_filesystem(&btrfs_fs_type);
 	printk("btrfs unloaded\n");

fs/btrfs/transaction.c

@@ -8,6 +8,8 @@ static int total_trans = 0;
 extern struct kmem_cache *btrfs_trans_handle_cachep;
 extern struct kmem_cache *btrfs_transaction_cachep;
 
+static struct workqueue_struct *trans_wq;
+
 #define BTRFS_ROOT_TRANS_TAG 0
 
 #define TRANS_MAGIC 0xE1E10E
@@ -44,6 +46,7 @@ static int join_transaction(struct btrfs_root *root)
 		cur_trans->in_commit = 0;
 		cur_trans->use_count = 1;
 		cur_trans->commit_done = 0;
+		cur_trans->start_time = get_seconds();
 		list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
 		init_bit_radix(&cur_trans->dirty_pages);
 	}
@@ -350,3 +353,60 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 	return ret;
 }
 
+void btrfs_transaction_cleaner(struct work_struct *work)
+{
+	struct btrfs_fs_info *fs_info = container_of(work,
+						     struct btrfs_fs_info,
+						     trans_work.work);
+
+	struct btrfs_root *root = fs_info->tree_root;
+	struct btrfs_transaction *cur;
+	struct btrfs_trans_handle *trans;
+	unsigned long now;
+	unsigned long delay = HZ * 30;
+	int ret;
+
+printk("btrfs transaction cleaner\n");
+	mutex_lock(&root->fs_info->fs_mutex);
+	mutex_lock(&root->fs_info->trans_mutex);
+	cur = root->fs_info->running_transaction;
+	if (!cur) {
+		mutex_unlock(&root->fs_info->trans_mutex);
+		goto out;
+	}
+	now = get_seconds();
+	if (now < cur->start_time || now - cur->start_time < 30) {
+		mutex_unlock(&root->fs_info->trans_mutex);
+		delay = HZ * 5;
+		goto out;
+	}
+	mutex_unlock(&root->fs_info->trans_mutex);
+printk("forcing commit\n");
+	trans = btrfs_start_transaction(root, 1);
+	ret = btrfs_commit_transaction(trans, root);
+out:
+	mutex_unlock(&root->fs_info->fs_mutex);
+	btrfs_transaction_queue_work(root, delay);
+}
+
+void btrfs_transaction_queue_work(struct btrfs_root *root, int delay)
+{
+	queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay);
+}
+
+void btrfs_transaction_flush_work(struct btrfs_root *root)
+{
+	cancel_rearming_delayed_workqueue(trans_wq, &root->fs_info->trans_work);
+	flush_workqueue(trans_wq);
+}
+
+void __init btrfs_init_transaction_sys(void)
+{
+	trans_wq = create_workqueue("btrfs");
+}
+
+void __exit btrfs_exit_transaction_sys(void)
+{
+	destroy_workqueue(trans_wq);
+}
+

fs/btrfs/transaction.h

@@ -11,6 +11,7 @@ struct btrfs_transaction {
 	int magic;
 	struct list_head list;
 	struct radix_tree_root dirty_pages;
+	unsigned long start_time;
 	wait_queue_head_t writer_wait;
 	wait_queue_head_t commit_wait;
 };
@@ -47,4 +48,11 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 				     struct btrfs_root *root);
 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
 			    struct btrfs_root *root);
+
+void btrfs_transaction_cleaner(struct work_struct *work);
+void btrfs_transaction_flush_work(struct btrfs_root *root);
+void btrfs_transaction_queue_work(struct btrfs_root *root, int delay);
+void btrfs_init_transaction_sys(void);
+void btrfs_exit_transaction_sys(void);
+
 #endif