--- /dev/null
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __BTRFS_TRANSACTION__
+#define __BTRFS_TRANSACTION__
+#include "btrfs_inode.h"
+#include "delayed-ref.h"
+#include "ctree.h"
+
+enum btrfs_trans_state {
+ TRANS_STATE_RUNNING = 0,
+ TRANS_STATE_BLOCKED = 1,
+ TRANS_STATE_COMMIT_START = 2,
+ TRANS_STATE_COMMIT_DOING = 3,
+ TRANS_STATE_UNBLOCKED = 4,
+ TRANS_STATE_COMPLETED = 5,
+ TRANS_STATE_MAX = 6,
+};
+
+struct btrfs_transaction {
+ u64 transid;
+ /*
+ * total external writers(USERSPACE/START/ATTACH) in this
+ * transaction, it must be zero before the transaction is
+ * being committed
+ */
+ atomic_t num_extwriters;
+ /*
+ * total writers in this transaction, it must be zero before the
+ * transaction can end
+ */
+ atomic_t num_writers;
+ atomic_t use_count;
+
+ /*
+ * true if there is free bgs operations in this transaction
+ */
+ int have_free_bgs;
+
+ /* Be protected by fs_info->trans_lock when we want to change it. */
+ enum btrfs_trans_state state;
+ struct list_head list;
+ struct extent_io_tree dirty_pages;
+ unsigned long start_time;
+ wait_queue_head_t writer_wait;
+ wait_queue_head_t commit_wait;
+ struct list_head pending_snapshots;
+ struct list_head pending_chunks;
+ struct list_head pending_ordered;
+ struct list_head switch_commits;
+ struct list_head dirty_bgs;
+ struct list_head io_bgs;
+ u64 num_dirty_bgs;
+
+ /*
+ * we need to make sure block group deletion doesn't race with
+ * free space cache writeout. This mutex keeps them from stomping
+ * on each other
+ */
+ struct mutex cache_write_mutex;
+ spinlock_t dirty_bgs_lock;
+ struct btrfs_delayed_ref_root delayed_refs;
+ int aborted;
+ int dirty_bg_run;
+};
+
+#define __TRANS_FREEZABLE (1U << 0)
+
+#define __TRANS_USERSPACE (1U << 8)
+#define __TRANS_START (1U << 9)
+#define __TRANS_ATTACH (1U << 10)
+#define __TRANS_JOIN (1U << 11)
+#define __TRANS_JOIN_NOLOCK (1U << 12)
+#define __TRANS_DUMMY (1U << 13)
+
+#define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE)
+#define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
+#define TRANS_ATTACH (__TRANS_ATTACH)
+#define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
+#define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
+
+#define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \
+ __TRANS_ATTACH)
+
+#define BTRFS_SEND_TRANS_STUB ((void *)1)
+
+struct btrfs_trans_handle {
+ u64 transid;
+ u64 bytes_reserved;
+ u64 qgroup_reserved;
+ unsigned long use_count;
+ unsigned long blocks_reserved;
+ unsigned long blocks_used;
+ unsigned long delayed_ref_updates;
+ struct btrfs_transaction *transaction;
+ struct btrfs_block_rsv *block_rsv;
+ struct btrfs_block_rsv *orig_rsv;
+ short aborted;
+ short adding_csums;
+ bool allocating_chunk;
+ bool reloc_reserved;
+ bool sync;
+ unsigned int type;
+ /*
+ * this root is only needed to validate that the root passed to
+ * start_transaction is the same as the one passed to end_transaction.
+ * Subvolume quota depends on this
+ */
+ struct btrfs_root *root;
+ struct seq_list delayed_ref_elem;
+ struct list_head ordered;
+ struct list_head qgroup_ref_list;
+ struct list_head new_bgs;
+};
+
+struct btrfs_pending_snapshot {
+ struct dentry *dentry;
+ struct inode *dir;
+ struct btrfs_root *root;
+ struct btrfs_root *snap;
+ struct btrfs_qgroup_inherit *inherit;
+ /* block reservation for the operation */
+ struct btrfs_block_rsv block_rsv;
+ u64 qgroup_reserved;
+ /* extra metadata reseration for relocation */
+ int error;
+ bool readonly;
+ struct list_head list;
+};
+
+static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
+ struct inode *inode)
+{
+ spin_lock(&BTRFS_I(inode)->lock);
+ BTRFS_I(inode)->last_trans = trans->transaction->transid;
+ BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
+ BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
+ spin_unlock(&BTRFS_I(inode)->lock);
+}
+
+int btrfs_end_transaction(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
+struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
+ int num_items);
+struct btrfs_trans_handle *btrfs_start_transaction_lflush(
+ struct btrfs_root *root, int num_items);
+struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
+struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
+struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
+struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
+ struct btrfs_root *root);
+struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
+int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
+
+void btrfs_add_dead_root(struct btrfs_root *root);
+int btrfs_defrag_root(struct btrfs_root *root);
+int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
+int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
+int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ int wait_for_unblock);
+int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
+int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
+void btrfs_throttle(struct btrfs_root *root);
+int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
+int btrfs_write_marked_extents(struct btrfs_root *root,
+ struct extent_io_tree *dirty_pages, int mark);
+int btrfs_wait_marked_extents(struct btrfs_root *root,
+ struct extent_io_tree *dirty_pages, int mark);
+int btrfs_transaction_blocked(struct btrfs_fs_info *info);
+int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
+void btrfs_put_transaction(struct btrfs_transaction *transaction);
+void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
+
+#endif
Code Review / kvmfornfv.git / blobdiff