/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * refcounttree.h
 *
 * Copyright (C) 2009 Oracle.  All rights reserved.
 */
#ifndef OCFS2_REFCOUNTTREE_H
#define OCFS2_REFCOUNTTREE_H

struct ocfs2_refcount_tree {
        struct rb_node rf_node;
        u64 rf_blkno;
        u32 rf_generation;
        struct kref rf_getcnt;
        struct rw_semaphore rf_sem;
        struct ocfs2_lock_res rf_lockres;
        int rf_removed;

        /* the following 4 fields are used by caching_info. */
        spinlock_t rf_lock;
        struct ocfs2_caching_info rf_ci;
        struct mutex rf_io_mutex;
        struct super_block *rf_sb;
};

void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
                             struct ocfs2_refcount_tree **tree,
                             struct buffer_head **ref_bh);
void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
                                struct ocfs2_refcount_tree *tree,
                                int rw);

int ocfs2_decrease_refcount(struct inode *inode,
                            handle_t *handle, u32 cpos, u32 len,
                            struct ocfs2_alloc_context *meta_ac,
                            struct ocfs2_cached_dealloc_ctxt *dealloc,
                            int delete);
int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
                                          u64 refcount_loc,
                                          u64 phys_blkno,
                                          u32 clusters,
                                          int *credits,
                                          int *ref_blocks);
int ocfs2_refcount_cow(struct inode *inode,
                       struct buffer_head *di_bh,
                       u32 cpos, u32 write_len, u32 max_cpos);

typedef int (ocfs2_post_refcount_func)(struct inode *inode,
                                       handle_t *handle,
                                       void *para);
/*
 * Some refcount caller need to do more work after we modify the data b-tree
 * during refcount operation(including CoW and add refcount flag), and make the
 * transaction complete. So it must give us this structure so that we can do it
 * within our transaction.
 *
 */
struct ocfs2_post_refcount {
        int credits;                    /* credits it need for journal. */
        ocfs2_post_refcount_func *func; /* real function. */
        void *para;
};

int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
                                       struct ocfs2_caching_info *ref_ci,
                                       struct buffer_head *ref_root_bh,
                                       struct ocfs2_xattr_value_root *xv,
                                       int *meta_add, int *credits);
int ocfs2_refcount_cow_xattr(struct inode *inode,
                             struct ocfs2_dinode *di,
                             struct ocfs2_xattr_value_buf *vb,
                             struct ocfs2_refcount_tree *ref_tree,
                             struct buffer_head *ref_root_bh,
                             u32 cpos, u32 write_len,
                             struct ocfs2_post_refcount *post);
int ocfs2_duplicate_clusters_by_page(handle_t *handle,
                                     struct inode *inode,
                                     u32 cpos, u32 old_cluster,
                                     u32 new_cluster, u32 new_len);
int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
                                    struct inode *inode,
                                    u32 cpos, u32 old_cluster,
                                    u32 new_cluster, u32 new_len);
int ocfs2_cow_sync_writeback(struct super_block *sb,
                             struct inode *inode,
                             u32 cpos, u32 num_clusters);
int ocfs2_add_refcount_flag(struct inode *inode,
                            struct ocfs2_extent_tree *data_et,
                            struct ocfs2_caching_info *ref_ci,
                            struct buffer_head *ref_root_bh,
                            u32 cpos, u32 p_cluster, u32 num_clusters,
                            struct ocfs2_cached_dealloc_ctxt *dealloc,
                            struct ocfs2_post_refcount *post);
int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
int ocfs2_try_remove_refcount_tree(struct inode *inode,
                                   struct buffer_head *di_bh);
int ocfs2_increase_refcount(handle_t *handle,
                            struct ocfs2_caching_info *ci,
                            struct buffer_head *ref_root_bh,
                            u64 cpos, u32 len,
                            struct ocfs2_alloc_context *meta_ac,
                            struct ocfs2_cached_dealloc_ctxt *dealloc);
int ocfs2_reflink_ioctl(struct inode *inode,
                        const char __user *oldname,
                        const char __user *newname,
                        bool preserve);
loff_t ocfs2_reflink_remap_blocks(struct inode *s_inode,
                                  struct buffer_head *s_bh,
                                  loff_t pos_in,
                                  struct inode *t_inode,
                                  struct buffer_head *t_bh,
                                  loff_t pos_out,
                                  loff_t len);
int ocfs2_reflink_inodes_lock(struct inode *s_inode,
                              struct buffer_head **bh1,
                              struct inode *t_inode,
                              struct buffer_head **bh2);
void ocfs2_reflink_inodes_unlock(struct inode *s_inode,
                                 struct buffer_head *s_bh,
                                 struct inode *t_inode,
                                 struct buffer_head *t_bh);
int ocfs2_reflink_update_dest(struct inode *dest,
                              struct buffer_head *d_bh,
                              loff_t newlen);

#endif /* OCFS2_REFCOUNTTREE_H */