/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2008 Oracle.  All rights reserved.
 */

#ifndef BTRFS_TREE_LOG_H
#define BTRFS_TREE_LOG_H

#include <linux/list.h>
#include <linux/fs.h>
#include <linux/fscrypt.h>
#include "transaction.h"

struct inode;
struct dentry;
struct btrfs_ordered_extent;
struct btrfs_root;
struct btrfs_trans_handle;

/* return value for btrfs_log_dentry_safe that means we don't need to log it at all */
#define BTRFS_NO_LOG_SYNC 256

/*
 * We can't use the tree log for whatever reason, force a transaction commit.
 * We use a negative value because there are functions through the logging code
 * that need to return an error (< 0 value), false (0) or true (1). Any negative
 * value will do, as it will cause the log to be marked for a full sync.
 */
#define BTRFS_LOG_FORCE_COMMIT                          (-(MAX_ERRNO + 1))

struct btrfs_log_ctx {
        int log_ret;
        int log_transid;
        bool log_new_dentries;
        bool logging_new_name;
        bool logging_new_delayed_dentries;
        /* Indicate if the inode being logged was logged before. */
        bool logged_before;
        struct btrfs_inode *inode;
        struct list_head list;
        /* Only used for fast fsyncs. */
        struct list_head ordered_extents;
        struct list_head conflict_inodes;
        int num_conflict_inodes;
        bool logging_conflict_inodes;
        /*
         * Used for fsyncs that need to copy items from the subvolume tree to
         * the log tree (full sync flag set or copy everything flag set) to
         * avoid allocating a temporary extent buffer while holding a lock on
         * an extent buffer of the subvolume tree and under the log transaction.
         * Also helps to avoid allocating and freeing a temporary extent buffer
         * in case we need to process multiple leaves from the subvolume tree.
         */
        struct extent_buffer *scratch_eb;
};

void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx, struct btrfs_inode *inode);
void btrfs_init_log_ctx_scratch_eb(struct btrfs_log_ctx *ctx);
void btrfs_release_log_ctx_extents(struct btrfs_log_ctx *ctx);

static inline void btrfs_set_log_full_commit(struct btrfs_trans_handle *trans)
{
        WRITE_ONCE(trans->fs_info->last_trans_log_full_commit, trans->transid);
}

static inline int btrfs_need_log_full_commit(struct btrfs_trans_handle *trans)
{
        return READ_ONCE(trans->fs_info->last_trans_log_full_commit) ==
                trans->transid;
}

int btrfs_sync_log(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root, struct btrfs_log_ctx *ctx);
int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root);
int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
                             struct btrfs_fs_info *fs_info);
int btrfs_recover_log_trees(struct btrfs_root *tree_root);
int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
                          struct dentry *dentry,
                          struct btrfs_log_ctx *ctx);
void btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
                                  const struct fscrypt_str *name,
                                  struct btrfs_inode *dir, u64 index);
void btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans,
                                const struct fscrypt_str *name,
                                struct btrfs_inode *inode,
                                struct btrfs_inode *dir);
void btrfs_end_log_trans(struct btrfs_root *root);
void btrfs_pin_log_trans(struct btrfs_root *root);
void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
                             struct btrfs_inode *dir, struct btrfs_inode *inode,
                             bool for_rename);
void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
                                   struct btrfs_inode *dir);
void btrfs_record_new_subvolume(const struct btrfs_trans_handle *trans,
                                struct btrfs_inode *dir);
void btrfs_log_new_name(struct btrfs_trans_handle *trans,
                        struct dentry *old_dentry, struct btrfs_inode *old_dir,
                        u64 old_dir_index, struct dentry *parent);

#endif